1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2001 Daniel Hartmeier
5 * Copyright (c) 2002 - 2008 Henning Brauer
6 * Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org>
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * - Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * - Redistributions in binary form must reproduce the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer in the documentation and/or other materials provided
18 * with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
28 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
30 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 *
33 * Effort sponsored in part by the Defense Advanced Research Projects
34 * Agency (DARPA) and Air Force Research Laboratory, Air Force
35 * Materiel Command, USAF, under agreement number F30602-01-2-0537.
36 *
37 * $OpenBSD: pf.c,v 1.634 2009/02/27 12:37:45 henning Exp $
38 */
39
40 #include <sys/cdefs.h>
41 #include "opt_bpf.h"
42 #include "opt_inet.h"
43 #include "opt_inet6.h"
44 #include "opt_pf.h"
45 #include "opt_sctp.h"
46
47 #include <sys/param.h>
48 #include <sys/bus.h>
49 #include <sys/endian.h>
50 #include <sys/gsb_crc32.h>
51 #include <sys/hash.h>
52 #include <sys/interrupt.h>
53 #include <sys/kernel.h>
54 #include <sys/kthread.h>
55 #include <sys/limits.h>
56 #include <sys/mbuf.h>
57 #include <sys/md5.h>
58 #include <sys/random.h>
59 #include <sys/refcount.h>
60 #include <sys/sdt.h>
61 #include <sys/socket.h>
62 #include <sys/sysctl.h>
63 #include <sys/taskqueue.h>
64 #include <sys/ucred.h>
65
66 #include <net/if.h>
67 #include <net/if_var.h>
68 #include <net/if_private.h>
69 #include <net/if_types.h>
70 #include <net/if_vlan_var.h>
71 #include <net/route.h>
72 #include <net/route/nhop.h>
73 #include <net/vnet.h>
74
75 #include <net/pfil.h>
76 #include <net/pfvar.h>
77 #include <net/if_pflog.h>
78 #include <net/if_pfsync.h>
79
80 #include <netinet/in_pcb.h>
81 #include <netinet/in_var.h>
82 #include <netinet/in_fib.h>
83 #include <netinet/ip.h>
84 #include <netinet/ip_fw.h>
85 #include <netinet/ip_icmp.h>
86 #include <netinet/icmp_var.h>
87 #include <netinet/ip_var.h>
88 #include <netinet/tcp.h>
89 #include <netinet/tcp_fsm.h>
90 #include <netinet/tcp_seq.h>
91 #include <netinet/tcp_timer.h>
92 #include <netinet/tcp_var.h>
93 #include <netinet/udp.h>
94 #include <netinet/udp_var.h>
95
96 /* dummynet */
97 #include <netinet/ip_dummynet.h>
98 #include <netinet/ip_fw.h>
99 #include <netpfil/ipfw/dn_heap.h>
100 #include <netpfil/ipfw/ip_fw_private.h>
101 #include <netpfil/ipfw/ip_dn_private.h>
102
103 #ifdef INET6
104 #include <netinet/ip6.h>
105 #include <netinet/icmp6.h>
106 #include <netinet6/nd6.h>
107 #include <netinet6/ip6_var.h>
108 #include <netinet6/in6_pcb.h>
109 #include <netinet6/in6_fib.h>
110 #include <netinet6/scope6_var.h>
111 #endif /* INET6 */
112
113 #include <netinet/sctp_header.h>
114 #include <netinet/sctp_crc32.h>
115
116 #include <machine/in_cksum.h>
117 #include <security/mac/mac_framework.h>
118
119 #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x
120
121 SDT_PROVIDER_DEFINE(pf);
122 SDT_PROBE_DEFINE4(pf, ip, test, done, "int", "int", "struct pf_krule *",
123 "struct pf_kstate *");
124 SDT_PROBE_DEFINE4(pf, ip, test6, done, "int", "int", "struct pf_krule *",
125 "struct pf_kstate *");
126 SDT_PROBE_DEFINE5(pf, ip, state, lookup, "struct pfi_kkif *",
127 "struct pf_state_key_cmp *", "int", "struct pf_pdesc *",
128 "struct pf_kstate *");
129 SDT_PROBE_DEFINE2(pf, ip, , bound_iface, "struct pf_kstate *",
130 "struct pfi_kkif *");
131 SDT_PROBE_DEFINE4(pf, sctp, multihome, test, "struct pfi_kkif *",
132 "struct pf_krule *", "struct mbuf *", "int");
133 SDT_PROBE_DEFINE2(pf, sctp, multihome, add, "uint32_t",
134 "struct pf_sctp_source *");
135 SDT_PROBE_DEFINE3(pf, sctp, multihome, remove, "uint32_t",
136 "struct pf_kstate *", "struct pf_sctp_source *");
137
138 SDT_PROBE_DEFINE3(pf, eth, test_rule, entry, "int", "struct ifnet *",
139 "struct mbuf *");
140 SDT_PROBE_DEFINE2(pf, eth, test_rule, test, "int", "struct pf_keth_rule *");
141 SDT_PROBE_DEFINE3(pf, eth, test_rule, mismatch,
142 "int", "struct pf_keth_rule *", "char *");
143 SDT_PROBE_DEFINE2(pf, eth, test_rule, match, "int", "struct pf_keth_rule *");
144 SDT_PROBE_DEFINE2(pf, eth, test_rule, final_match,
145 "int", "struct pf_keth_rule *");
146 SDT_PROBE_DEFINE2(pf, purge, state, rowcount, "int", "size_t");
147
148 /*
149 * Global variables
150 */
151
152 /* state tables */
153 VNET_DEFINE(struct pf_altqqueue, pf_altqs[4]);
154 VNET_DEFINE(struct pf_kpalist, pf_pabuf);
155 VNET_DEFINE(struct pf_altqqueue *, pf_altqs_active);
156 VNET_DEFINE(struct pf_altqqueue *, pf_altq_ifs_active);
157 VNET_DEFINE(struct pf_altqqueue *, pf_altqs_inactive);
158 VNET_DEFINE(struct pf_altqqueue *, pf_altq_ifs_inactive);
159 VNET_DEFINE(struct pf_kstatus, pf_status);
160
161 VNET_DEFINE(u_int32_t, ticket_altqs_active);
162 VNET_DEFINE(u_int32_t, ticket_altqs_inactive);
163 VNET_DEFINE(int, altqs_inactive_open);
164 VNET_DEFINE(u_int32_t, ticket_pabuf);
165
166 VNET_DEFINE(MD5_CTX, pf_tcp_secret_ctx);
167 #define V_pf_tcp_secret_ctx VNET(pf_tcp_secret_ctx)
168 VNET_DEFINE(u_char, pf_tcp_secret[16]);
169 #define V_pf_tcp_secret VNET(pf_tcp_secret)
170 VNET_DEFINE(int, pf_tcp_secret_init);
171 #define V_pf_tcp_secret_init VNET(pf_tcp_secret_init)
172 VNET_DEFINE(int, pf_tcp_iss_off);
173 #define V_pf_tcp_iss_off VNET(pf_tcp_iss_off)
174 VNET_DECLARE(int, pf_vnet_active);
175 #define V_pf_vnet_active VNET(pf_vnet_active)
176
177 VNET_DEFINE_STATIC(uint32_t, pf_purge_idx);
178 #define V_pf_purge_idx VNET(pf_purge_idx)
179
180 #ifdef PF_WANT_32_TO_64_COUNTER
181 VNET_DEFINE_STATIC(uint32_t, pf_counter_periodic_iter);
182 #define V_pf_counter_periodic_iter VNET(pf_counter_periodic_iter)
183
184 VNET_DEFINE(struct allrulelist_head, pf_allrulelist);
185 VNET_DEFINE(size_t, pf_allrulecount);
186 VNET_DEFINE(struct pf_krule *, pf_rulemarker);
187 #endif
188
189 struct pf_sctp_endpoint;
190 RB_HEAD(pf_sctp_endpoints, pf_sctp_endpoint);
191 struct pf_sctp_source {
192 sa_family_t af;
193 struct pf_addr addr;
194 TAILQ_ENTRY(pf_sctp_source) entry;
195 };
196 TAILQ_HEAD(pf_sctp_sources, pf_sctp_source);
197 struct pf_sctp_endpoint
198 {
199 uint32_t v_tag;
200 struct pf_sctp_sources sources;
201 RB_ENTRY(pf_sctp_endpoint) entry;
202 };
203 static int
pf_sctp_endpoint_compare(struct pf_sctp_endpoint * a,struct pf_sctp_endpoint * b)204 pf_sctp_endpoint_compare(struct pf_sctp_endpoint *a, struct pf_sctp_endpoint *b)
205 {
206 return (a->v_tag - b->v_tag);
207 }
208 RB_PROTOTYPE(pf_sctp_endpoints, pf_sctp_endpoint, entry, pf_sctp_endpoint_compare);
209 RB_GENERATE(pf_sctp_endpoints, pf_sctp_endpoint, entry, pf_sctp_endpoint_compare);
210 VNET_DEFINE_STATIC(struct pf_sctp_endpoints, pf_sctp_endpoints);
211 #define V_pf_sctp_endpoints VNET(pf_sctp_endpoints)
212 static struct mtx_padalign pf_sctp_endpoints_mtx;
213 MTX_SYSINIT(pf_sctp_endpoints_mtx, &pf_sctp_endpoints_mtx, "SCTP endpoints", MTX_DEF);
214 #define PF_SCTP_ENDPOINTS_LOCK() mtx_lock(&pf_sctp_endpoints_mtx)
215 #define PF_SCTP_ENDPOINTS_UNLOCK() mtx_unlock(&pf_sctp_endpoints_mtx)
216
217 /*
218 * Queue for pf_intr() sends.
219 */
220 static MALLOC_DEFINE(M_PFTEMP, "pf_temp", "pf(4) temporary allocations");
221 struct pf_send_entry {
222 STAILQ_ENTRY(pf_send_entry) pfse_next;
223 struct mbuf *pfse_m;
224 enum {
225 PFSE_IP,
226 PFSE_IP6,
227 PFSE_ICMP,
228 PFSE_ICMP6,
229 } pfse_type;
230 struct {
231 int type;
232 int code;
233 int mtu;
234 } icmpopts;
235 };
236
237 STAILQ_HEAD(pf_send_head, pf_send_entry);
238 VNET_DEFINE_STATIC(struct pf_send_head, pf_sendqueue);
239 #define V_pf_sendqueue VNET(pf_sendqueue)
240
241 static struct mtx_padalign pf_sendqueue_mtx;
242 MTX_SYSINIT(pf_sendqueue_mtx, &pf_sendqueue_mtx, "pf send queue", MTX_DEF);
243 #define PF_SENDQ_LOCK() mtx_lock(&pf_sendqueue_mtx)
244 #define PF_SENDQ_UNLOCK() mtx_unlock(&pf_sendqueue_mtx)
245
246 /*
247 * Queue for pf_overload_task() tasks.
248 */
249 struct pf_overload_entry {
250 SLIST_ENTRY(pf_overload_entry) next;
251 struct pf_addr addr;
252 sa_family_t af;
253 uint8_t dir;
254 struct pf_krule *rule;
255 };
256
257 SLIST_HEAD(pf_overload_head, pf_overload_entry);
258 VNET_DEFINE_STATIC(struct pf_overload_head, pf_overloadqueue);
259 #define V_pf_overloadqueue VNET(pf_overloadqueue)
260 VNET_DEFINE_STATIC(struct task, pf_overloadtask);
261 #define V_pf_overloadtask VNET(pf_overloadtask)
262
263 static struct mtx_padalign pf_overloadqueue_mtx;
264 MTX_SYSINIT(pf_overloadqueue_mtx, &pf_overloadqueue_mtx,
265 "pf overload/flush queue", MTX_DEF);
266 #define PF_OVERLOADQ_LOCK() mtx_lock(&pf_overloadqueue_mtx)
267 #define PF_OVERLOADQ_UNLOCK() mtx_unlock(&pf_overloadqueue_mtx)
268
269 VNET_DEFINE(struct pf_krulequeue, pf_unlinked_rules);
270 struct mtx_padalign pf_unlnkdrules_mtx;
271 MTX_SYSINIT(pf_unlnkdrules_mtx, &pf_unlnkdrules_mtx, "pf unlinked rules",
272 MTX_DEF);
273
274 struct sx pf_config_lock;
275 SX_SYSINIT(pf_config_lock, &pf_config_lock, "pf config");
276
277 struct mtx_padalign pf_table_stats_lock;
278 MTX_SYSINIT(pf_table_stats_lock, &pf_table_stats_lock, "pf table stats",
279 MTX_DEF);
280
281 VNET_DEFINE_STATIC(uma_zone_t, pf_sources_z);
282 #define V_pf_sources_z VNET(pf_sources_z)
283 uma_zone_t pf_mtag_z;
284 VNET_DEFINE(uma_zone_t, pf_state_z);
285 VNET_DEFINE(uma_zone_t, pf_state_key_z);
286
287 VNET_DEFINE(struct unrhdr64, pf_stateid);
288
289 static void pf_src_tree_remove_state(struct pf_kstate *);
290 static void pf_init_threshold(struct pf_threshold *, u_int32_t,
291 u_int32_t);
292 static void pf_add_threshold(struct pf_threshold *);
293 static int pf_check_threshold(struct pf_threshold *);
294
295 static void pf_change_ap(struct mbuf *, struct pf_addr *, u_int16_t *,
296 u_int16_t *, u_int16_t *, struct pf_addr *,
297 u_int16_t, u_int8_t, sa_family_t);
298 static int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *,
299 struct tcphdr *, struct pf_state_peer *);
300 static void pf_change_icmp(struct pf_addr *, u_int16_t *,
301 struct pf_addr *, struct pf_addr *, u_int16_t,
302 u_int16_t *, u_int16_t *, u_int16_t *,
303 u_int16_t *, u_int8_t, sa_family_t);
304 static void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
305 sa_family_t, struct pf_krule *, int);
306 static void pf_detach_state(struct pf_kstate *);
307 static int pf_state_key_attach(struct pf_state_key *,
308 struct pf_state_key *, struct pf_kstate *);
309 static void pf_state_key_detach(struct pf_kstate *, int);
310 static int pf_state_key_ctor(void *, int, void *, int);
311 static u_int32_t pf_tcp_iss(struct pf_pdesc *);
312 static __inline void pf_dummynet_flag_remove(struct mbuf *m,
313 struct pf_mtag *pf_mtag);
314 static int pf_dummynet(struct pf_pdesc *, struct pf_kstate *,
315 struct pf_krule *, struct mbuf **);
316 static int pf_dummynet_route(struct pf_pdesc *,
317 struct pf_kstate *, struct pf_krule *,
318 struct ifnet *, struct sockaddr *, struct mbuf **);
319 static int pf_test_eth_rule(int, struct pfi_kkif *,
320 struct mbuf **);
321 static int pf_test_rule(struct pf_krule **, struct pf_kstate **,
322 struct pfi_kkif *, struct mbuf *, int,
323 struct pf_pdesc *, struct pf_krule **,
324 struct pf_kruleset **, struct inpcb *);
325 static int pf_create_state(struct pf_krule *, struct pf_krule *,
326 struct pf_krule *, struct pf_pdesc *,
327 struct pf_ksrc_node *, struct pf_state_key *,
328 struct pf_state_key *, struct mbuf *, int,
329 u_int16_t, u_int16_t, int *, struct pfi_kkif *,
330 struct pf_kstate **, int, u_int16_t, u_int16_t,
331 int, struct pf_krule_slist *);
332 static int pf_test_fragment(struct pf_krule **, struct pfi_kkif *,
333 struct mbuf *, void *, struct pf_pdesc *,
334 struct pf_krule **, struct pf_kruleset **);
335 static int pf_tcp_track_full(struct pf_kstate **,
336 struct pfi_kkif *, struct mbuf *, int,
337 struct pf_pdesc *, u_short *, int *);
338 static int pf_tcp_track_sloppy(struct pf_kstate **,
339 struct pf_pdesc *, u_short *);
340 static int pf_test_state_tcp(struct pf_kstate **,
341 struct pfi_kkif *, struct mbuf *, int,
342 void *, struct pf_pdesc *, u_short *);
343 static int pf_test_state_udp(struct pf_kstate **,
344 struct pfi_kkif *, struct mbuf *, int,
345 void *, struct pf_pdesc *);
346 static int pf_test_state_icmp(struct pf_kstate **,
347 struct pfi_kkif *, struct mbuf *, int,
348 void *, struct pf_pdesc *, u_short *);
349 static void pf_sctp_multihome_detach_addr(const struct pf_kstate *);
350 static void pf_sctp_multihome_delayed(struct pf_pdesc *, int,
351 struct pfi_kkif *, struct pf_kstate *, int);
352 static int pf_test_state_sctp(struct pf_kstate **,
353 struct pfi_kkif *, struct mbuf *, int,
354 void *, struct pf_pdesc *, u_short *);
355 static int pf_test_state_other(struct pf_kstate **,
356 struct pfi_kkif *, struct mbuf *, struct pf_pdesc *);
357 static u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t,
358 int, u_int16_t);
359 static int pf_check_proto_cksum(struct mbuf *, int, int,
360 u_int8_t, sa_family_t);
361 static void pf_print_state_parts(struct pf_kstate *,
362 struct pf_state_key *, struct pf_state_key *);
363 static void pf_patch_8(struct mbuf *, u_int16_t *, u_int8_t *, u_int8_t,
364 bool, u_int8_t);
365 static struct pf_kstate *pf_find_state(struct pfi_kkif *,
366 struct pf_state_key_cmp *, u_int);
367 static int pf_src_connlimit(struct pf_kstate **);
368 static void pf_overload_task(void *v, int pending);
369 static u_short pf_insert_src_node(struct pf_ksrc_node **,
370 struct pf_krule *, struct pf_addr *, sa_family_t);
371 static u_int pf_purge_expired_states(u_int, int);
372 static void pf_purge_unlinked_rules(void);
373 static int pf_mtag_uminit(void *, int, int);
374 static void pf_mtag_free(struct m_tag *);
375 static void pf_packet_rework_nat(struct mbuf *, struct pf_pdesc *,
376 int, struct pf_state_key *);
377 #ifdef INET
378 static void pf_route(struct mbuf **, struct pf_krule *,
379 struct ifnet *, struct pf_kstate *,
380 struct pf_pdesc *, struct inpcb *);
381 #endif /* INET */
382 #ifdef INET6
383 static void pf_change_a6(struct pf_addr *, u_int16_t *,
384 struct pf_addr *, u_int8_t);
385 static void pf_route6(struct mbuf **, struct pf_krule *,
386 struct ifnet *, struct pf_kstate *,
387 struct pf_pdesc *, struct inpcb *);
388 #endif /* INET6 */
389 static __inline void pf_set_protostate(struct pf_kstate *, int, u_int8_t);
390
391 int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len);
392
393 extern int pf_end_threads;
394 extern struct proc *pf_purge_proc;
395
396 VNET_DEFINE(struct pf_limit, pf_limits[PF_LIMIT_MAX]);
397
398 #define PACKET_UNDO_NAT(_m, _pd, _off, _s) \
399 do { \
400 struct pf_state_key *nk; \
401 if ((pd->dir) == PF_OUT) \
402 nk = (_s)->key[PF_SK_STACK]; \
403 else \
404 nk = (_s)->key[PF_SK_WIRE]; \
405 pf_packet_rework_nat(_m, _pd, _off, nk); \
406 } while (0)
407
408 #define PACKET_LOOPED(pd) ((pd)->pf_mtag && \
409 (pd)->pf_mtag->flags & PF_MTAG_FLAG_PACKET_LOOPED)
410
411 #define STATE_LOOKUP(i, k, s, pd) \
412 do { \
413 (s) = pf_find_state((i), (k), (pd->dir)); \
414 SDT_PROBE5(pf, ip, state, lookup, i, k, (pd->dir), pd, (s)); \
415 if ((s) == NULL) \
416 return (PF_DROP); \
417 if (PACKET_LOOPED(pd)) \
418 return (PF_PASS); \
419 } while (0)
420
421 static struct pfi_kkif *
BOUND_IFACE(struct pf_kstate * st,struct pfi_kkif * k)422 BOUND_IFACE(struct pf_kstate *st, struct pfi_kkif *k)
423 {
424 SDT_PROBE2(pf, ip, , bound_iface, st, k);
425
426 /* Floating unless otherwise specified. */
427 if (! (st->rule.ptr->rule_flag & PFRULE_IFBOUND))
428 return (V_pfi_all);
429
430 /*
431 * Initially set to all, because we don't know what interface we'll be
432 * sending this out when we create the state.
433 */
434 if (st->rule.ptr->rt == PF_REPLYTO)
435 return (V_pfi_all);
436
437 /* Don't overrule the interface for states created on incoming packets. */
438 if (st->direction == PF_IN)
439 return (k);
440
441 /* No route-to, so don't overrule. */
442 if (st->rt != PF_ROUTETO)
443 return (k);
444
445 /* Bind to the route-to interface. */
446 return (st->rt_kif);
447 }
448
449 #define STATE_INC_COUNTERS(s) \
450 do { \
451 struct pf_krule_item *mrm; \
452 counter_u64_add(s->rule.ptr->states_cur, 1); \
453 counter_u64_add(s->rule.ptr->states_tot, 1); \
454 if (s->anchor.ptr != NULL) { \
455 counter_u64_add(s->anchor.ptr->states_cur, 1); \
456 counter_u64_add(s->anchor.ptr->states_tot, 1); \
457 } \
458 if (s->nat_rule.ptr != NULL) { \
459 counter_u64_add(s->nat_rule.ptr->states_cur, 1);\
460 counter_u64_add(s->nat_rule.ptr->states_tot, 1);\
461 } \
462 SLIST_FOREACH(mrm, &s->match_rules, entry) { \
463 counter_u64_add(mrm->r->states_cur, 1); \
464 counter_u64_add(mrm->r->states_tot, 1); \
465 } \
466 } while (0)
467
468 #define STATE_DEC_COUNTERS(s) \
469 do { \
470 struct pf_krule_item *mrm; \
471 if (s->nat_rule.ptr != NULL) \
472 counter_u64_add(s->nat_rule.ptr->states_cur, -1);\
473 if (s->anchor.ptr != NULL) \
474 counter_u64_add(s->anchor.ptr->states_cur, -1); \
475 counter_u64_add(s->rule.ptr->states_cur, -1); \
476 SLIST_FOREACH(mrm, &s->match_rules, entry) \
477 counter_u64_add(mrm->r->states_cur, -1); \
478 } while (0)
479
480 MALLOC_DEFINE(M_PFHASH, "pf_hash", "pf(4) hash header structures");
481 MALLOC_DEFINE(M_PF_RULE_ITEM, "pf_krule_item", "pf(4) rule items");
482 VNET_DEFINE(struct pf_keyhash *, pf_keyhash);
483 VNET_DEFINE(struct pf_idhash *, pf_idhash);
484 VNET_DEFINE(struct pf_srchash *, pf_srchash);
485
486 SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
487 "pf(4)");
488
489 u_long pf_hashmask;
490 u_long pf_srchashmask;
491 static u_long pf_hashsize;
492 static u_long pf_srchashsize;
493 u_long pf_ioctl_maxcount = 65535;
494
495 SYSCTL_ULONG(_net_pf, OID_AUTO, states_hashsize, CTLFLAG_RDTUN,
496 &pf_hashsize, 0, "Size of pf(4) states hashtable");
497 SYSCTL_ULONG(_net_pf, OID_AUTO, source_nodes_hashsize, CTLFLAG_RDTUN,
498 &pf_srchashsize, 0, "Size of pf(4) source nodes hashtable");
499 SYSCTL_ULONG(_net_pf, OID_AUTO, request_maxcount, CTLFLAG_RWTUN,
500 &pf_ioctl_maxcount, 0, "Maximum number of tables, addresses, ... in a single ioctl() call");
501
502 VNET_DEFINE(void *, pf_swi_cookie);
503 VNET_DEFINE(struct intr_event *, pf_swi_ie);
504
505 VNET_DEFINE(uint32_t, pf_hashseed);
506 #define V_pf_hashseed VNET(pf_hashseed)
507
508 static void
pf_sctp_checksum(struct mbuf * m,int off)509 pf_sctp_checksum(struct mbuf *m, int off)
510 {
511 uint32_t sum = 0;
512
513 /* Zero out the checksum, to enable recalculation. */
514 m_copyback(m, off + offsetof(struct sctphdr, checksum),
515 sizeof(sum), (caddr_t)&sum);
516
517 sum = sctp_calculate_cksum(m, off);
518
519 m_copyback(m, off + offsetof(struct sctphdr, checksum),
520 sizeof(sum), (caddr_t)&sum);
521 }
522
523 int
pf_addr_cmp(struct pf_addr * a,struct pf_addr * b,sa_family_t af)524 pf_addr_cmp(struct pf_addr *a, struct pf_addr *b, sa_family_t af)
525 {
526
527 switch (af) {
528 #ifdef INET
529 case AF_INET:
530 if (a->addr32[0] > b->addr32[0])
531 return (1);
532 if (a->addr32[0] < b->addr32[0])
533 return (-1);
534 break;
535 #endif /* INET */
536 #ifdef INET6
537 case AF_INET6:
538 if (a->addr32[3] > b->addr32[3])
539 return (1);
540 if (a->addr32[3] < b->addr32[3])
541 return (-1);
542 if (a->addr32[2] > b->addr32[2])
543 return (1);
544 if (a->addr32[2] < b->addr32[2])
545 return (-1);
546 if (a->addr32[1] > b->addr32[1])
547 return (1);
548 if (a->addr32[1] < b->addr32[1])
549 return (-1);
550 if (a->addr32[0] > b->addr32[0])
551 return (1);
552 if (a->addr32[0] < b->addr32[0])
553 return (-1);
554 break;
555 #endif /* INET6 */
556 default:
557 panic("%s: unknown address family %u", __func__, af);
558 }
559 return (0);
560 }
561
562 static void
pf_packet_rework_nat(struct mbuf * m,struct pf_pdesc * pd,int off,struct pf_state_key * nk)563 pf_packet_rework_nat(struct mbuf *m, struct pf_pdesc *pd, int off,
564 struct pf_state_key *nk)
565 {
566
567 switch (pd->proto) {
568 case IPPROTO_TCP: {
569 struct tcphdr *th = &pd->hdr.tcp;
570
571 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af))
572 pf_change_ap(m, pd->src, &th->th_sport, pd->ip_sum,
573 &th->th_sum, &nk->addr[pd->sidx],
574 nk->port[pd->sidx], 0, pd->af);
575 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af))
576 pf_change_ap(m, pd->dst, &th->th_dport, pd->ip_sum,
577 &th->th_sum, &nk->addr[pd->didx],
578 nk->port[pd->didx], 0, pd->af);
579 m_copyback(m, off, sizeof(*th), (caddr_t)th);
580 break;
581 }
582 case IPPROTO_UDP: {
583 struct udphdr *uh = &pd->hdr.udp;
584
585 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af))
586 pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum,
587 &uh->uh_sum, &nk->addr[pd->sidx],
588 nk->port[pd->sidx], 1, pd->af);
589 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af))
590 pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum,
591 &uh->uh_sum, &nk->addr[pd->didx],
592 nk->port[pd->didx], 1, pd->af);
593 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
594 break;
595 }
596 case IPPROTO_SCTP: {
597 struct sctphdr *sh = &pd->hdr.sctp;
598 uint16_t checksum = 0;
599
600 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af)) {
601 pf_change_ap(m, pd->src, &sh->src_port, pd->ip_sum,
602 &checksum, &nk->addr[pd->sidx],
603 nk->port[pd->sidx], 1, pd->af);
604 }
605 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af)) {
606 pf_change_ap(m, pd->dst, &sh->dest_port, pd->ip_sum,
607 &checksum, &nk->addr[pd->didx],
608 nk->port[pd->didx], 1, pd->af);
609 }
610
611 break;
612 }
613 case IPPROTO_ICMP: {
614 struct icmp *ih = &pd->hdr.icmp;
615
616 if (nk->port[pd->sidx] != ih->icmp_id) {
617 pd->hdr.icmp.icmp_cksum = pf_cksum_fixup(
618 ih->icmp_cksum, ih->icmp_id,
619 nk->port[pd->sidx], 0);
620 ih->icmp_id = nk->port[pd->sidx];
621 pd->sport = &ih->icmp_id;
622
623 m_copyback(m, off, ICMP_MINLEN, (caddr_t)ih);
624 }
625 /* FALLTHROUGH */
626 }
627 default:
628 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af)) {
629 switch (pd->af) {
630 case AF_INET:
631 pf_change_a(&pd->src->v4.s_addr,
632 pd->ip_sum, nk->addr[pd->sidx].v4.s_addr,
633 0);
634 break;
635 case AF_INET6:
636 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af);
637 break;
638 }
639 }
640 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af)) {
641 switch (pd->af) {
642 case AF_INET:
643 pf_change_a(&pd->dst->v4.s_addr,
644 pd->ip_sum, nk->addr[pd->didx].v4.s_addr,
645 0);
646 break;
647 case AF_INET6:
648 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af);
649 break;
650 }
651 }
652 break;
653 }
654 }
655
656 static __inline uint32_t
pf_hashkey(struct pf_state_key * sk)657 pf_hashkey(struct pf_state_key *sk)
658 {
659 uint32_t h;
660
661 h = murmur3_32_hash32((uint32_t *)sk,
662 sizeof(struct pf_state_key_cmp)/sizeof(uint32_t),
663 V_pf_hashseed);
664
665 return (h & pf_hashmask);
666 }
667
668 static __inline uint32_t
pf_hashsrc(struct pf_addr * addr,sa_family_t af)669 pf_hashsrc(struct pf_addr *addr, sa_family_t af)
670 {
671 uint32_t h;
672
673 switch (af) {
674 case AF_INET:
675 h = murmur3_32_hash32((uint32_t *)&addr->v4,
676 sizeof(addr->v4)/sizeof(uint32_t), V_pf_hashseed);
677 break;
678 case AF_INET6:
679 h = murmur3_32_hash32((uint32_t *)&addr->v6,
680 sizeof(addr->v6)/sizeof(uint32_t), V_pf_hashseed);
681 break;
682 default:
683 panic("%s: unknown address family %u", __func__, af);
684 }
685
686 return (h & pf_srchashmask);
687 }
688
689 #ifdef ALTQ
690 static int
pf_state_hash(struct pf_kstate * s)691 pf_state_hash(struct pf_kstate *s)
692 {
693 u_int32_t hv = (intptr_t)s / sizeof(*s);
694
695 hv ^= crc32(&s->src, sizeof(s->src));
696 hv ^= crc32(&s->dst, sizeof(s->dst));
697 if (hv == 0)
698 hv = 1;
699 return (hv);
700 }
701 #endif
702
703 static __inline void
pf_set_protostate(struct pf_kstate * s,int which,u_int8_t newstate)704 pf_set_protostate(struct pf_kstate *s, int which, u_int8_t newstate)
705 {
706 if (which == PF_PEER_DST || which == PF_PEER_BOTH)
707 s->dst.state = newstate;
708 if (which == PF_PEER_DST)
709 return;
710 if (s->src.state == newstate)
711 return;
712 if (s->creatorid == V_pf_status.hostid &&
713 s->key[PF_SK_STACK] != NULL &&
714 s->key[PF_SK_STACK]->proto == IPPROTO_TCP &&
715 !(TCPS_HAVEESTABLISHED(s->src.state) ||
716 s->src.state == TCPS_CLOSED) &&
717 (TCPS_HAVEESTABLISHED(newstate) || newstate == TCPS_CLOSED))
718 atomic_add_32(&V_pf_status.states_halfopen, -1);
719
720 s->src.state = newstate;
721 }
722
723 #ifdef INET6
724 void
pf_addrcpy(struct pf_addr * dst,struct pf_addr * src,sa_family_t af)725 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
726 {
727 switch (af) {
728 #ifdef INET
729 case AF_INET:
730 memcpy(&dst->v4, &src->v4, sizeof(dst->v4));
731 break;
732 #endif /* INET */
733 case AF_INET6:
734 memcpy(&dst->v6, &src->v6, sizeof(dst->v6));
735 break;
736 }
737 }
738 #endif /* INET6 */
739
740 static void
pf_init_threshold(struct pf_threshold * threshold,u_int32_t limit,u_int32_t seconds)741 pf_init_threshold(struct pf_threshold *threshold,
742 u_int32_t limit, u_int32_t seconds)
743 {
744 threshold->limit = limit * PF_THRESHOLD_MULT;
745 threshold->seconds = seconds;
746 threshold->count = 0;
747 threshold->last = time_uptime;
748 }
749
750 static void
pf_add_threshold(struct pf_threshold * threshold)751 pf_add_threshold(struct pf_threshold *threshold)
752 {
753 u_int32_t t = time_uptime, diff = t - threshold->last;
754
755 if (diff >= threshold->seconds)
756 threshold->count = 0;
757 else
758 threshold->count -= threshold->count * diff /
759 threshold->seconds;
760 threshold->count += PF_THRESHOLD_MULT;
761 threshold->last = t;
762 }
763
764 static int
pf_check_threshold(struct pf_threshold * threshold)765 pf_check_threshold(struct pf_threshold *threshold)
766 {
767 return (threshold->count > threshold->limit);
768 }
769
770 static int
pf_src_connlimit(struct pf_kstate ** state)771 pf_src_connlimit(struct pf_kstate **state)
772 {
773 struct pf_overload_entry *pfoe;
774 int bad = 0;
775
776 PF_STATE_LOCK_ASSERT(*state);
777 /*
778 * XXXKS: The src node is accessed unlocked!
779 * PF_SRC_NODE_LOCK_ASSERT((*state)->src_node);
780 */
781
782 (*state)->src_node->conn++;
783 (*state)->src.tcp_est = 1;
784 pf_add_threshold(&(*state)->src_node->conn_rate);
785
786 if ((*state)->rule.ptr->max_src_conn &&
787 (*state)->rule.ptr->max_src_conn <
788 (*state)->src_node->conn) {
789 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONN], 1);
790 bad++;
791 }
792
793 if ((*state)->rule.ptr->max_src_conn_rate.limit &&
794 pf_check_threshold(&(*state)->src_node->conn_rate)) {
795 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONNRATE], 1);
796 bad++;
797 }
798
799 if (!bad)
800 return (0);
801
802 /* Kill this state. */
803 (*state)->timeout = PFTM_PURGE;
804 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_CLOSED);
805
806 if ((*state)->rule.ptr->overload_tbl == NULL)
807 return (1);
808
809 /* Schedule overloading and flushing task. */
810 pfoe = malloc(sizeof(*pfoe), M_PFTEMP, M_NOWAIT);
811 if (pfoe == NULL)
812 return (1); /* too bad :( */
813
814 bcopy(&(*state)->src_node->addr, &pfoe->addr, sizeof(pfoe->addr));
815 pfoe->af = (*state)->key[PF_SK_WIRE]->af;
816 pfoe->rule = (*state)->rule.ptr;
817 pfoe->dir = (*state)->direction;
818 PF_OVERLOADQ_LOCK();
819 SLIST_INSERT_HEAD(&V_pf_overloadqueue, pfoe, next);
820 PF_OVERLOADQ_UNLOCK();
821 taskqueue_enqueue(taskqueue_swi, &V_pf_overloadtask);
822
823 return (1);
824 }
825
826 static void
pf_overload_task(void * v,int pending)827 pf_overload_task(void *v, int pending)
828 {
829 struct pf_overload_head queue;
830 struct pfr_addr p;
831 struct pf_overload_entry *pfoe, *pfoe1;
832 uint32_t killed = 0;
833
834 CURVNET_SET((struct vnet *)v);
835
836 PF_OVERLOADQ_LOCK();
837 queue = V_pf_overloadqueue;
838 SLIST_INIT(&V_pf_overloadqueue);
839 PF_OVERLOADQ_UNLOCK();
840
841 bzero(&p, sizeof(p));
842 SLIST_FOREACH(pfoe, &queue, next) {
843 counter_u64_add(V_pf_status.lcounters[LCNT_OVERLOAD_TABLE], 1);
844 if (V_pf_status.debug >= PF_DEBUG_MISC) {
845 printf("%s: blocking address ", __func__);
846 pf_print_host(&pfoe->addr, 0, pfoe->af);
847 printf("\n");
848 }
849
850 p.pfra_af = pfoe->af;
851 switch (pfoe->af) {
852 #ifdef INET
853 case AF_INET:
854 p.pfra_net = 32;
855 p.pfra_ip4addr = pfoe->addr.v4;
856 break;
857 #endif
858 #ifdef INET6
859 case AF_INET6:
860 p.pfra_net = 128;
861 p.pfra_ip6addr = pfoe->addr.v6;
862 break;
863 #endif
864 }
865
866 PF_RULES_WLOCK();
867 pfr_insert_kentry(pfoe->rule->overload_tbl, &p, time_second);
868 PF_RULES_WUNLOCK();
869 }
870
871 /*
872 * Remove those entries, that don't need flushing.
873 */
874 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1)
875 if (pfoe->rule->flush == 0) {
876 SLIST_REMOVE(&queue, pfoe, pf_overload_entry, next);
877 free(pfoe, M_PFTEMP);
878 } else
879 counter_u64_add(
880 V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH], 1);
881
882 /* If nothing to flush, return. */
883 if (SLIST_EMPTY(&queue)) {
884 CURVNET_RESTORE();
885 return;
886 }
887
888 for (int i = 0; i <= pf_hashmask; i++) {
889 struct pf_idhash *ih = &V_pf_idhash[i];
890 struct pf_state_key *sk;
891 struct pf_kstate *s;
892
893 PF_HASHROW_LOCK(ih);
894 LIST_FOREACH(s, &ih->states, entry) {
895 sk = s->key[PF_SK_WIRE];
896 SLIST_FOREACH(pfoe, &queue, next)
897 if (sk->af == pfoe->af &&
898 ((pfoe->rule->flush & PF_FLUSH_GLOBAL) ||
899 pfoe->rule == s->rule.ptr) &&
900 ((pfoe->dir == PF_OUT &&
901 PF_AEQ(&pfoe->addr, &sk->addr[1], sk->af)) ||
902 (pfoe->dir == PF_IN &&
903 PF_AEQ(&pfoe->addr, &sk->addr[0], sk->af)))) {
904 s->timeout = PFTM_PURGE;
905 pf_set_protostate(s, PF_PEER_BOTH, TCPS_CLOSED);
906 killed++;
907 }
908 }
909 PF_HASHROW_UNLOCK(ih);
910 }
911 SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1)
912 free(pfoe, M_PFTEMP);
913 if (V_pf_status.debug >= PF_DEBUG_MISC)
914 printf("%s: %u states killed", __func__, killed);
915
916 CURVNET_RESTORE();
917 }
918
919 /*
920 * Can return locked on failure, so that we can consistently
921 * allocate and insert a new one.
922 */
923 struct pf_ksrc_node *
pf_find_src_node(struct pf_addr * src,struct pf_krule * rule,sa_family_t af,struct pf_srchash ** sh,bool returnlocked)924 pf_find_src_node(struct pf_addr *src, struct pf_krule *rule, sa_family_t af,
925 struct pf_srchash **sh, bool returnlocked)
926 {
927 struct pf_ksrc_node *n;
928
929 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_SEARCH], 1);
930
931 *sh = &V_pf_srchash[pf_hashsrc(src, af)];
932 PF_HASHROW_LOCK(*sh);
933 LIST_FOREACH(n, &(*sh)->nodes, entry)
934 if (n->rule.ptr == rule && n->af == af &&
935 ((af == AF_INET && n->addr.v4.s_addr == src->v4.s_addr) ||
936 (af == AF_INET6 && bcmp(&n->addr, src, sizeof(*src)) == 0)))
937 break;
938
939 if (n != NULL) {
940 n->states++;
941 PF_HASHROW_UNLOCK(*sh);
942 } else if (returnlocked == false)
943 PF_HASHROW_UNLOCK(*sh);
944
945 return (n);
946 }
947
948 static void
pf_free_src_node(struct pf_ksrc_node * sn)949 pf_free_src_node(struct pf_ksrc_node *sn)
950 {
951
952 for (int i = 0; i < 2; i++) {
953 counter_u64_free(sn->bytes[i]);
954 counter_u64_free(sn->packets[i]);
955 }
956 uma_zfree(V_pf_sources_z, sn);
957 }
958
959 static u_short
pf_insert_src_node(struct pf_ksrc_node ** sn,struct pf_krule * rule,struct pf_addr * src,sa_family_t af)960 pf_insert_src_node(struct pf_ksrc_node **sn, struct pf_krule *rule,
961 struct pf_addr *src, sa_family_t af)
962 {
963 u_short reason = 0;
964 struct pf_srchash *sh = NULL;
965
966 KASSERT((rule->rule_flag & PFRULE_SRCTRACK ||
967 rule->rpool.opts & PF_POOL_STICKYADDR),
968 ("%s for non-tracking rule %p", __func__, rule));
969
970 if (*sn == NULL)
971 *sn = pf_find_src_node(src, rule, af, &sh, true);
972
973 if (*sn == NULL) {
974 PF_HASHROW_ASSERT(sh);
975
976 if (rule->max_src_nodes &&
977 counter_u64_fetch(rule->src_nodes) >= rule->max_src_nodes) {
978 counter_u64_add(V_pf_status.lcounters[LCNT_SRCNODES], 1);
979 PF_HASHROW_UNLOCK(sh);
980 reason = PFRES_SRCLIMIT;
981 goto done;
982 }
983
984 (*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO);
985 if ((*sn) == NULL) {
986 PF_HASHROW_UNLOCK(sh);
987 reason = PFRES_MEMORY;
988 goto done;
989 }
990
991 for (int i = 0; i < 2; i++) {
992 (*sn)->bytes[i] = counter_u64_alloc(M_NOWAIT);
993 (*sn)->packets[i] = counter_u64_alloc(M_NOWAIT);
994
995 if ((*sn)->bytes[i] == NULL || (*sn)->packets[i] == NULL) {
996 pf_free_src_node(*sn);
997 PF_HASHROW_UNLOCK(sh);
998 reason = PFRES_MEMORY;
999 goto done;
1000 }
1001 }
1002
1003 pf_init_threshold(&(*sn)->conn_rate,
1004 rule->max_src_conn_rate.limit,
1005 rule->max_src_conn_rate.seconds);
1006
1007 MPASS((*sn)->lock == NULL);
1008 (*sn)->lock = &sh->lock;
1009
1010 (*sn)->af = af;
1011 (*sn)->rule.ptr = rule;
1012 PF_ACPY(&(*sn)->addr, src, af);
1013 LIST_INSERT_HEAD(&sh->nodes, *sn, entry);
1014 (*sn)->creation = time_uptime;
1015 (*sn)->ruletype = rule->action;
1016 (*sn)->states = 1;
1017 if ((*sn)->rule.ptr != NULL)
1018 counter_u64_add((*sn)->rule.ptr->src_nodes, 1);
1019 PF_HASHROW_UNLOCK(sh);
1020 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_INSERT], 1);
1021 } else {
1022 if (rule->max_src_states &&
1023 (*sn)->states >= rule->max_src_states) {
1024 counter_u64_add(V_pf_status.lcounters[LCNT_SRCSTATES],
1025 1);
1026 reason = PFRES_SRCLIMIT;
1027 goto done;
1028 }
1029 }
1030 done:
1031 return (reason);
1032 }
1033
1034 void
pf_unlink_src_node(struct pf_ksrc_node * src)1035 pf_unlink_src_node(struct pf_ksrc_node *src)
1036 {
1037 PF_SRC_NODE_LOCK_ASSERT(src);
1038
1039 LIST_REMOVE(src, entry);
1040 if (src->rule.ptr)
1041 counter_u64_add(src->rule.ptr->src_nodes, -1);
1042 }
1043
1044 u_int
pf_free_src_nodes(struct pf_ksrc_node_list * head)1045 pf_free_src_nodes(struct pf_ksrc_node_list *head)
1046 {
1047 struct pf_ksrc_node *sn, *tmp;
1048 u_int count = 0;
1049
1050 LIST_FOREACH_SAFE(sn, head, entry, tmp) {
1051 pf_free_src_node(sn);
1052 count++;
1053 }
1054
1055 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], count);
1056
1057 return (count);
1058 }
1059
1060 void
pf_mtag_initialize(void)1061 pf_mtag_initialize(void)
1062 {
1063
1064 pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) +
1065 sizeof(struct pf_mtag), NULL, NULL, pf_mtag_uminit, NULL,
1066 UMA_ALIGN_PTR, 0);
1067 }
1068
1069 /* Per-vnet data storage structures initialization. */
1070 void
pf_initialize(void)1071 pf_initialize(void)
1072 {
1073 struct pf_keyhash *kh;
1074 struct pf_idhash *ih;
1075 struct pf_srchash *sh;
1076 u_int i;
1077
1078 if (pf_hashsize == 0 || !powerof2(pf_hashsize))
1079 pf_hashsize = PF_HASHSIZ;
1080 if (pf_srchashsize == 0 || !powerof2(pf_srchashsize))
1081 pf_srchashsize = PF_SRCHASHSIZ;
1082
1083 V_pf_hashseed = arc4random();
1084
1085 /* States and state keys storage. */
1086 V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_kstate),
1087 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
1088 V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z;
1089 uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT);
1090 uma_zone_set_warning(V_pf_state_z, "PF states limit reached");
1091
1092 V_pf_state_key_z = uma_zcreate("pf state keys",
1093 sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL,
1094 UMA_ALIGN_PTR, 0);
1095
1096 V_pf_keyhash = mallocarray(pf_hashsize, sizeof(struct pf_keyhash),
1097 M_PFHASH, M_NOWAIT | M_ZERO);
1098 V_pf_idhash = mallocarray(pf_hashsize, sizeof(struct pf_idhash),
1099 M_PFHASH, M_NOWAIT | M_ZERO);
1100 if (V_pf_keyhash == NULL || V_pf_idhash == NULL) {
1101 printf("pf: Unable to allocate memory for "
1102 "state_hashsize %lu.\n", pf_hashsize);
1103
1104 free(V_pf_keyhash, M_PFHASH);
1105 free(V_pf_idhash, M_PFHASH);
1106
1107 pf_hashsize = PF_HASHSIZ;
1108 V_pf_keyhash = mallocarray(pf_hashsize,
1109 sizeof(struct pf_keyhash), M_PFHASH, M_WAITOK | M_ZERO);
1110 V_pf_idhash = mallocarray(pf_hashsize,
1111 sizeof(struct pf_idhash), M_PFHASH, M_WAITOK | M_ZERO);
1112 }
1113
1114 pf_hashmask = pf_hashsize - 1;
1115 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask;
1116 i++, kh++, ih++) {
1117 mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF | MTX_DUPOK);
1118 mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF);
1119 }
1120
1121 /* Source nodes. */
1122 V_pf_sources_z = uma_zcreate("pf source nodes",
1123 sizeof(struct pf_ksrc_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR,
1124 0);
1125 V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z;
1126 uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT);
1127 uma_zone_set_warning(V_pf_sources_z, "PF source nodes limit reached");
1128
1129 V_pf_srchash = mallocarray(pf_srchashsize,
1130 sizeof(struct pf_srchash), M_PFHASH, M_NOWAIT | M_ZERO);
1131 if (V_pf_srchash == NULL) {
1132 printf("pf: Unable to allocate memory for "
1133 "source_hashsize %lu.\n", pf_srchashsize);
1134
1135 pf_srchashsize = PF_SRCHASHSIZ;
1136 V_pf_srchash = mallocarray(pf_srchashsize,
1137 sizeof(struct pf_srchash), M_PFHASH, M_WAITOK | M_ZERO);
1138 }
1139
1140 pf_srchashmask = pf_srchashsize - 1;
1141 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++)
1142 mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF);
1143
1144 /* ALTQ */
1145 TAILQ_INIT(&V_pf_altqs[0]);
1146 TAILQ_INIT(&V_pf_altqs[1]);
1147 TAILQ_INIT(&V_pf_altqs[2]);
1148 TAILQ_INIT(&V_pf_altqs[3]);
1149 TAILQ_INIT(&V_pf_pabuf);
1150 V_pf_altqs_active = &V_pf_altqs[0];
1151 V_pf_altq_ifs_active = &V_pf_altqs[1];
1152 V_pf_altqs_inactive = &V_pf_altqs[2];
1153 V_pf_altq_ifs_inactive = &V_pf_altqs[3];
1154
1155 /* Send & overload+flush queues. */
1156 STAILQ_INIT(&V_pf_sendqueue);
1157 SLIST_INIT(&V_pf_overloadqueue);
1158 TASK_INIT(&V_pf_overloadtask, 0, pf_overload_task, curvnet);
1159
1160 /* Unlinked, but may be referenced rules. */
1161 TAILQ_INIT(&V_pf_unlinked_rules);
1162 }
1163
1164 void
pf_mtag_cleanup(void)1165 pf_mtag_cleanup(void)
1166 {
1167
1168 uma_zdestroy(pf_mtag_z);
1169 }
1170
1171 void
pf_cleanup(void)1172 pf_cleanup(void)
1173 {
1174 struct pf_keyhash *kh;
1175 struct pf_idhash *ih;
1176 struct pf_srchash *sh;
1177 struct pf_send_entry *pfse, *next;
1178 u_int i;
1179
1180 for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask;
1181 i++, kh++, ih++) {
1182 KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty",
1183 __func__));
1184 KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty",
1185 __func__));
1186 mtx_destroy(&kh->lock);
1187 mtx_destroy(&ih->lock);
1188 }
1189 free(V_pf_keyhash, M_PFHASH);
1190 free(V_pf_idhash, M_PFHASH);
1191
1192 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) {
1193 KASSERT(LIST_EMPTY(&sh->nodes),
1194 ("%s: source node hash not empty", __func__));
1195 mtx_destroy(&sh->lock);
1196 }
1197 free(V_pf_srchash, M_PFHASH);
1198
1199 STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) {
1200 m_freem(pfse->pfse_m);
1201 free(pfse, M_PFTEMP);
1202 }
1203 MPASS(RB_EMPTY(&V_pf_sctp_endpoints));
1204
1205 uma_zdestroy(V_pf_sources_z);
1206 uma_zdestroy(V_pf_state_z);
1207 uma_zdestroy(V_pf_state_key_z);
1208 }
1209
1210 static int
pf_mtag_uminit(void * mem,int size,int how)1211 pf_mtag_uminit(void *mem, int size, int how)
1212 {
1213 struct m_tag *t;
1214
1215 t = (struct m_tag *)mem;
1216 t->m_tag_cookie = MTAG_ABI_COMPAT;
1217 t->m_tag_id = PACKET_TAG_PF;
1218 t->m_tag_len = sizeof(struct pf_mtag);
1219 t->m_tag_free = pf_mtag_free;
1220
1221 return (0);
1222 }
1223
1224 static void
pf_mtag_free(struct m_tag * t)1225 pf_mtag_free(struct m_tag *t)
1226 {
1227
1228 uma_zfree(pf_mtag_z, t);
1229 }
1230
1231 struct pf_mtag *
pf_get_mtag(struct mbuf * m)1232 pf_get_mtag(struct mbuf *m)
1233 {
1234 struct m_tag *mtag;
1235
1236 if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL)
1237 return ((struct pf_mtag *)(mtag + 1));
1238
1239 mtag = uma_zalloc(pf_mtag_z, M_NOWAIT);
1240 if (mtag == NULL)
1241 return (NULL);
1242 bzero(mtag + 1, sizeof(struct pf_mtag));
1243 m_tag_prepend(m, mtag);
1244
1245 return ((struct pf_mtag *)(mtag + 1));
1246 }
1247
1248 static int
pf_state_key_attach(struct pf_state_key * skw,struct pf_state_key * sks,struct pf_kstate * s)1249 pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks,
1250 struct pf_kstate *s)
1251 {
1252 struct pf_keyhash *khs, *khw, *kh;
1253 struct pf_state_key *sk, *cur;
1254 struct pf_kstate *si, *olds = NULL;
1255 int idx;
1256
1257 NET_EPOCH_ASSERT();
1258 KASSERT(s->refs == 0, ("%s: state not pristine", __func__));
1259 KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__));
1260 KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__));
1261
1262 /*
1263 * We need to lock hash slots of both keys. To avoid deadlock
1264 * we always lock the slot with lower address first. Unlock order
1265 * isn't important.
1266 *
1267 * We also need to lock ID hash slot before dropping key
1268 * locks. On success we return with ID hash slot locked.
1269 */
1270
1271 if (skw == sks) {
1272 khs = khw = &V_pf_keyhash[pf_hashkey(skw)];
1273 PF_HASHROW_LOCK(khs);
1274 } else {
1275 khs = &V_pf_keyhash[pf_hashkey(sks)];
1276 khw = &V_pf_keyhash[pf_hashkey(skw)];
1277 if (khs == khw) {
1278 PF_HASHROW_LOCK(khs);
1279 } else if (khs < khw) {
1280 PF_HASHROW_LOCK(khs);
1281 PF_HASHROW_LOCK(khw);
1282 } else {
1283 PF_HASHROW_LOCK(khw);
1284 PF_HASHROW_LOCK(khs);
1285 }
1286 }
1287
1288 #define KEYS_UNLOCK() do { \
1289 if (khs != khw) { \
1290 PF_HASHROW_UNLOCK(khs); \
1291 PF_HASHROW_UNLOCK(khw); \
1292 } else \
1293 PF_HASHROW_UNLOCK(khs); \
1294 } while (0)
1295
1296 /*
1297 * First run: start with wire key.
1298 */
1299 sk = skw;
1300 kh = khw;
1301 idx = PF_SK_WIRE;
1302
1303 MPASS(s->lock == NULL);
1304 s->lock = &V_pf_idhash[PF_IDHASH(s)].lock;
1305
1306 keyattach:
1307 LIST_FOREACH(cur, &kh->keys, entry)
1308 if (bcmp(cur, sk, sizeof(struct pf_state_key_cmp)) == 0)
1309 break;
1310
1311 if (cur != NULL) {
1312 /* Key exists. Check for same kif, if none, add to key. */
1313 TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) {
1314 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)];
1315
1316 PF_HASHROW_LOCK(ih);
1317 if (si->kif == s->kif &&
1318 si->direction == s->direction) {
1319 if (sk->proto == IPPROTO_TCP &&
1320 si->src.state >= TCPS_FIN_WAIT_2 &&
1321 si->dst.state >= TCPS_FIN_WAIT_2) {
1322 /*
1323 * New state matches an old >FIN_WAIT_2
1324 * state. We can't drop key hash locks,
1325 * thus we can't unlink it properly.
1326 *
1327 * As a workaround we drop it into
1328 * TCPS_CLOSED state, schedule purge
1329 * ASAP and push it into the very end
1330 * of the slot TAILQ, so that it won't
1331 * conflict with our new state.
1332 */
1333 pf_set_protostate(si, PF_PEER_BOTH,
1334 TCPS_CLOSED);
1335 si->timeout = PFTM_PURGE;
1336 olds = si;
1337 } else {
1338 if (V_pf_status.debug >= PF_DEBUG_MISC) {
1339 printf("pf: %s key attach "
1340 "failed on %s: ",
1341 (idx == PF_SK_WIRE) ?
1342 "wire" : "stack",
1343 s->kif->pfik_name);
1344 pf_print_state_parts(s,
1345 (idx == PF_SK_WIRE) ?
1346 sk : NULL,
1347 (idx == PF_SK_STACK) ?
1348 sk : NULL);
1349 printf(", existing: ");
1350 pf_print_state_parts(si,
1351 (idx == PF_SK_WIRE) ?
1352 sk : NULL,
1353 (idx == PF_SK_STACK) ?
1354 sk : NULL);
1355 printf("\n");
1356 }
1357 s->timeout = PFTM_UNLINKED;
1358 PF_HASHROW_UNLOCK(ih);
1359 KEYS_UNLOCK();
1360 uma_zfree(V_pf_state_key_z, sk);
1361 if (idx == PF_SK_STACK)
1362 pf_detach_state(s);
1363 return (EEXIST); /* collision! */
1364 }
1365 }
1366 PF_HASHROW_UNLOCK(ih);
1367 }
1368 uma_zfree(V_pf_state_key_z, sk);
1369 s->key[idx] = cur;
1370 } else {
1371 LIST_INSERT_HEAD(&kh->keys, sk, entry);
1372 s->key[idx] = sk;
1373 }
1374
1375 stateattach:
1376 /* List is sorted, if-bound states before floating. */
1377 if (s->kif == V_pfi_all)
1378 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]);
1379 else
1380 TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]);
1381
1382 if (olds) {
1383 TAILQ_REMOVE(&s->key[idx]->states[idx], olds, key_list[idx]);
1384 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], olds,
1385 key_list[idx]);
1386 olds = NULL;
1387 }
1388
1389 /*
1390 * Attach done. See how should we (or should not?)
1391 * attach a second key.
1392 */
1393 if (sks == skw) {
1394 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE];
1395 idx = PF_SK_STACK;
1396 sks = NULL;
1397 goto stateattach;
1398 } else if (sks != NULL) {
1399 /*
1400 * Continue attaching with stack key.
1401 */
1402 sk = sks;
1403 kh = khs;
1404 idx = PF_SK_STACK;
1405 sks = NULL;
1406 goto keyattach;
1407 }
1408
1409 PF_STATE_LOCK(s);
1410 KEYS_UNLOCK();
1411
1412 KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL,
1413 ("%s failure", __func__));
1414
1415 return (0);
1416 #undef KEYS_UNLOCK
1417 }
1418
1419 static void
pf_detach_state(struct pf_kstate * s)1420 pf_detach_state(struct pf_kstate *s)
1421 {
1422 struct pf_state_key *sks = s->key[PF_SK_STACK];
1423 struct pf_keyhash *kh;
1424
1425 NET_EPOCH_ASSERT();
1426 MPASS(s->timeout >= PFTM_MAX);
1427
1428 pf_sctp_multihome_detach_addr(s);
1429
1430 if ((s->state_flags & PFSTATE_PFLOW) && V_pflow_export_state_ptr)
1431 V_pflow_export_state_ptr(s);
1432
1433 if (sks != NULL) {
1434 kh = &V_pf_keyhash[pf_hashkey(sks)];
1435 PF_HASHROW_LOCK(kh);
1436 if (s->key[PF_SK_STACK] != NULL)
1437 pf_state_key_detach(s, PF_SK_STACK);
1438 /*
1439 * If both point to same key, then we are done.
1440 */
1441 if (sks == s->key[PF_SK_WIRE]) {
1442 pf_state_key_detach(s, PF_SK_WIRE);
1443 PF_HASHROW_UNLOCK(kh);
1444 return;
1445 }
1446 PF_HASHROW_UNLOCK(kh);
1447 }
1448
1449 if (s->key[PF_SK_WIRE] != NULL) {
1450 kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])];
1451 PF_HASHROW_LOCK(kh);
1452 if (s->key[PF_SK_WIRE] != NULL)
1453 pf_state_key_detach(s, PF_SK_WIRE);
1454 PF_HASHROW_UNLOCK(kh);
1455 }
1456 }
1457
1458 static void
pf_state_key_detach(struct pf_kstate * s,int idx)1459 pf_state_key_detach(struct pf_kstate *s, int idx)
1460 {
1461 struct pf_state_key *sk = s->key[idx];
1462 #ifdef INVARIANTS
1463 struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)];
1464
1465 PF_HASHROW_ASSERT(kh);
1466 #endif
1467 TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]);
1468 s->key[idx] = NULL;
1469
1470 if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) {
1471 LIST_REMOVE(sk, entry);
1472 uma_zfree(V_pf_state_key_z, sk);
1473 }
1474 }
1475
1476 static int
pf_state_key_ctor(void * mem,int size,void * arg,int flags)1477 pf_state_key_ctor(void *mem, int size, void *arg, int flags)
1478 {
1479 struct pf_state_key *sk = mem;
1480
1481 bzero(sk, sizeof(struct pf_state_key_cmp));
1482 TAILQ_INIT(&sk->states[PF_SK_WIRE]);
1483 TAILQ_INIT(&sk->states[PF_SK_STACK]);
1484
1485 return (0);
1486 }
1487
1488 struct pf_state_key *
pf_state_key_setup(struct pf_pdesc * pd,struct pf_addr * saddr,struct pf_addr * daddr,u_int16_t sport,u_int16_t dport)1489 pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr,
1490 struct pf_addr *daddr, u_int16_t sport, u_int16_t dport)
1491 {
1492 struct pf_state_key *sk;
1493
1494 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT);
1495 if (sk == NULL)
1496 return (NULL);
1497
1498 PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af);
1499 PF_ACPY(&sk->addr[pd->didx], daddr, pd->af);
1500 sk->port[pd->sidx] = sport;
1501 sk->port[pd->didx] = dport;
1502 sk->proto = pd->proto;
1503 sk->af = pd->af;
1504
1505 return (sk);
1506 }
1507
1508 struct pf_state_key *
pf_state_key_clone(struct pf_state_key * orig)1509 pf_state_key_clone(struct pf_state_key *orig)
1510 {
1511 struct pf_state_key *sk;
1512
1513 sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT);
1514 if (sk == NULL)
1515 return (NULL);
1516
1517 bcopy(orig, sk, sizeof(struct pf_state_key_cmp));
1518
1519 return (sk);
1520 }
1521
1522 int
pf_state_insert(struct pfi_kkif * kif,struct pfi_kkif * orig_kif,struct pf_state_key * skw,struct pf_state_key * sks,struct pf_kstate * s)1523 pf_state_insert(struct pfi_kkif *kif, struct pfi_kkif *orig_kif,
1524 struct pf_state_key *skw, struct pf_state_key *sks, struct pf_kstate *s)
1525 {
1526 struct pf_idhash *ih;
1527 struct pf_kstate *cur;
1528 int error;
1529
1530 NET_EPOCH_ASSERT();
1531
1532 KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]),
1533 ("%s: sks not pristine", __func__));
1534 KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]),
1535 ("%s: skw not pristine", __func__));
1536 KASSERT(s->refs == 0, ("%s: state not pristine", __func__));
1537
1538 s->kif = kif;
1539 s->orig_kif = orig_kif;
1540
1541 if (s->id == 0 && s->creatorid == 0) {
1542 s->id = alloc_unr64(&V_pf_stateid);
1543 s->id = htobe64(s->id);
1544 s->creatorid = V_pf_status.hostid;
1545 }
1546
1547 /* Returns with ID locked on success. */
1548 if ((error = pf_state_key_attach(skw, sks, s)) != 0)
1549 return (error);
1550
1551 ih = &V_pf_idhash[PF_IDHASH(s)];
1552 PF_HASHROW_ASSERT(ih);
1553 LIST_FOREACH(cur, &ih->states, entry)
1554 if (cur->id == s->id && cur->creatorid == s->creatorid)
1555 break;
1556
1557 if (cur != NULL) {
1558 s->timeout = PFTM_UNLINKED;
1559 PF_HASHROW_UNLOCK(ih);
1560 if (V_pf_status.debug >= PF_DEBUG_MISC) {
1561 printf("pf: state ID collision: "
1562 "id: %016llx creatorid: %08x\n",
1563 (unsigned long long)be64toh(s->id),
1564 ntohl(s->creatorid));
1565 }
1566 pf_detach_state(s);
1567 return (EEXIST);
1568 }
1569 LIST_INSERT_HEAD(&ih->states, s, entry);
1570 /* One for keys, one for ID hash. */
1571 refcount_init(&s->refs, 2);
1572
1573 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_INSERT], 1);
1574 if (V_pfsync_insert_state_ptr != NULL)
1575 V_pfsync_insert_state_ptr(s);
1576
1577 /* Returns locked. */
1578 return (0);
1579 }
1580
1581 /*
1582 * Find state by ID: returns with locked row on success.
1583 */
1584 struct pf_kstate *
pf_find_state_byid(uint64_t id,uint32_t creatorid)1585 pf_find_state_byid(uint64_t id, uint32_t creatorid)
1586 {
1587 struct pf_idhash *ih;
1588 struct pf_kstate *s;
1589
1590 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_SEARCH], 1);
1591
1592 ih = &V_pf_idhash[(be64toh(id) % (pf_hashmask + 1))];
1593
1594 PF_HASHROW_LOCK(ih);
1595 LIST_FOREACH(s, &ih->states, entry)
1596 if (s->id == id && s->creatorid == creatorid)
1597 break;
1598
1599 if (s == NULL)
1600 PF_HASHROW_UNLOCK(ih);
1601
1602 return (s);
1603 }
1604
1605 /*
1606 * Find state by key.
1607 * Returns with ID hash slot locked on success.
1608 */
1609 static struct pf_kstate *
pf_find_state(struct pfi_kkif * kif,struct pf_state_key_cmp * key,u_int dir)1610 pf_find_state(struct pfi_kkif *kif, struct pf_state_key_cmp *key, u_int dir)
1611 {
1612 struct pf_keyhash *kh;
1613 struct pf_state_key *sk;
1614 struct pf_kstate *s;
1615 int idx;
1616
1617 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_SEARCH], 1);
1618
1619 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)];
1620
1621 PF_HASHROW_LOCK(kh);
1622 LIST_FOREACH(sk, &kh->keys, entry)
1623 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0)
1624 break;
1625 if (sk == NULL) {
1626 PF_HASHROW_UNLOCK(kh);
1627 return (NULL);
1628 }
1629
1630 idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK);
1631
1632 /* List is sorted, if-bound states before floating ones. */
1633 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx])
1634 if (s->kif == V_pfi_all || s->kif == kif || s->orig_kif == kif) {
1635 PF_STATE_LOCK(s);
1636 PF_HASHROW_UNLOCK(kh);
1637 if (__predict_false(s->timeout >= PFTM_MAX)) {
1638 /*
1639 * State is either being processed by
1640 * pf_unlink_state() in an other thread, or
1641 * is scheduled for immediate expiry.
1642 */
1643 PF_STATE_UNLOCK(s);
1644 return (NULL);
1645 }
1646 return (s);
1647 }
1648 PF_HASHROW_UNLOCK(kh);
1649
1650 return (NULL);
1651 }
1652
1653 /*
1654 * Returns with ID hash slot locked on success.
1655 */
1656 struct pf_kstate *
pf_find_state_all(struct pf_state_key_cmp * key,u_int dir,int * more)1657 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more)
1658 {
1659 struct pf_keyhash *kh;
1660 struct pf_state_key *sk;
1661 struct pf_kstate *s, *ret = NULL;
1662 int idx, inout = 0;
1663
1664 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_SEARCH], 1);
1665
1666 kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)];
1667
1668 PF_HASHROW_LOCK(kh);
1669 LIST_FOREACH(sk, &kh->keys, entry)
1670 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0)
1671 break;
1672 if (sk == NULL) {
1673 PF_HASHROW_UNLOCK(kh);
1674 return (NULL);
1675 }
1676 switch (dir) {
1677 case PF_IN:
1678 idx = PF_SK_WIRE;
1679 break;
1680 case PF_OUT:
1681 idx = PF_SK_STACK;
1682 break;
1683 case PF_INOUT:
1684 idx = PF_SK_WIRE;
1685 inout = 1;
1686 break;
1687 default:
1688 panic("%s: dir %u", __func__, dir);
1689 }
1690 second_run:
1691 TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) {
1692 if (more == NULL) {
1693 PF_STATE_LOCK(s);
1694 PF_HASHROW_UNLOCK(kh);
1695 return (s);
1696 }
1697
1698 if (ret)
1699 (*more)++;
1700 else {
1701 ret = s;
1702 PF_STATE_LOCK(s);
1703 }
1704 }
1705 if (inout == 1) {
1706 inout = 0;
1707 idx = PF_SK_STACK;
1708 goto second_run;
1709 }
1710 PF_HASHROW_UNLOCK(kh);
1711
1712 return (ret);
1713 }
1714
1715 /*
1716 * FIXME
1717 * This routine is inefficient -- locks the state only to unlock immediately on
1718 * return.
1719 * It is racy -- after the state is unlocked nothing stops other threads from
1720 * removing it.
1721 */
1722 bool
pf_find_state_all_exists(struct pf_state_key_cmp * key,u_int dir)1723 pf_find_state_all_exists(struct pf_state_key_cmp *key, u_int dir)
1724 {
1725 struct pf_kstate *s;
1726
1727 s = pf_find_state_all(key, dir, NULL);
1728 if (s != NULL) {
1729 PF_STATE_UNLOCK(s);
1730 return (true);
1731 }
1732 return (false);
1733 }
1734
1735 /* END state table stuff */
1736
1737 static void
pf_send(struct pf_send_entry * pfse)1738 pf_send(struct pf_send_entry *pfse)
1739 {
1740
1741 PF_SENDQ_LOCK();
1742 STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next);
1743 PF_SENDQ_UNLOCK();
1744 swi_sched(V_pf_swi_cookie, 0);
1745 }
1746
1747 static bool
pf_isforlocal(struct mbuf * m,int af)1748 pf_isforlocal(struct mbuf *m, int af)
1749 {
1750 switch (af) {
1751 #ifdef INET
1752 case AF_INET: {
1753 struct ip *ip = mtod(m, struct ip *);
1754
1755 return (in_localip(ip->ip_dst));
1756 }
1757 #endif
1758 #ifdef INET6
1759 case AF_INET6: {
1760 struct ip6_hdr *ip6;
1761 struct in6_ifaddr *ia;
1762 ip6 = mtod(m, struct ip6_hdr *);
1763 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false);
1764 if (ia == NULL)
1765 return (false);
1766 return (! (ia->ia6_flags & IN6_IFF_NOTREADY));
1767 }
1768 #endif
1769 default:
1770 panic("Unsupported af %d", af);
1771 }
1772
1773 return (false);
1774 }
1775
1776 void
pf_intr(void * v)1777 pf_intr(void *v)
1778 {
1779 struct epoch_tracker et;
1780 struct pf_send_head queue;
1781 struct pf_send_entry *pfse, *next;
1782
1783 CURVNET_SET((struct vnet *)v);
1784
1785 PF_SENDQ_LOCK();
1786 queue = V_pf_sendqueue;
1787 STAILQ_INIT(&V_pf_sendqueue);
1788 PF_SENDQ_UNLOCK();
1789
1790 NET_EPOCH_ENTER(et);
1791
1792 STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) {
1793 switch (pfse->pfse_type) {
1794 #ifdef INET
1795 case PFSE_IP: {
1796 if (pf_isforlocal(pfse->pfse_m, AF_INET)) {
1797 pfse->pfse_m->m_flags |= M_SKIP_FIREWALL;
1798 pfse->pfse_m->m_pkthdr.csum_flags |=
1799 CSUM_IP_VALID | CSUM_IP_CHECKED;
1800 ip_input(pfse->pfse_m);
1801 } else {
1802 ip_output(pfse->pfse_m, NULL, NULL, 0, NULL,
1803 NULL);
1804 }
1805 break;
1806 }
1807 case PFSE_ICMP:
1808 icmp_error(pfse->pfse_m, pfse->icmpopts.type,
1809 pfse->icmpopts.code, 0, pfse->icmpopts.mtu);
1810 break;
1811 #endif /* INET */
1812 #ifdef INET6
1813 case PFSE_IP6:
1814 if (pf_isforlocal(pfse->pfse_m, AF_INET6)) {
1815 pfse->pfse_m->m_flags |= M_SKIP_FIREWALL;
1816 ip6_input(pfse->pfse_m);
1817 } else {
1818 ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL,
1819 NULL, NULL);
1820 }
1821 break;
1822 case PFSE_ICMP6:
1823 icmp6_error(pfse->pfse_m, pfse->icmpopts.type,
1824 pfse->icmpopts.code, pfse->icmpopts.mtu);
1825 break;
1826 #endif /* INET6 */
1827 default:
1828 panic("%s: unknown type", __func__);
1829 }
1830 free(pfse, M_PFTEMP);
1831 }
1832 NET_EPOCH_EXIT(et);
1833 CURVNET_RESTORE();
1834 }
1835
1836 #define pf_purge_thread_period (hz / 10)
1837
1838 #ifdef PF_WANT_32_TO_64_COUNTER
1839 static void
pf_status_counter_u64_periodic(void)1840 pf_status_counter_u64_periodic(void)
1841 {
1842
1843 PF_RULES_RASSERT();
1844
1845 if ((V_pf_counter_periodic_iter % (pf_purge_thread_period * 10 * 60)) != 0) {
1846 return;
1847 }
1848
1849 for (int i = 0; i < FCNT_MAX; i++) {
1850 pf_counter_u64_periodic(&V_pf_status.fcounters[i]);
1851 }
1852 }
1853
1854 static void
pf_kif_counter_u64_periodic(void)1855 pf_kif_counter_u64_periodic(void)
1856 {
1857 struct pfi_kkif *kif;
1858 size_t r, run;
1859
1860 PF_RULES_RASSERT();
1861
1862 if (__predict_false(V_pf_allkifcount == 0)) {
1863 return;
1864 }
1865
1866 if ((V_pf_counter_periodic_iter % (pf_purge_thread_period * 10 * 300)) != 0) {
1867 return;
1868 }
1869
1870 run = V_pf_allkifcount / 10;
1871 if (run < 5)
1872 run = 5;
1873
1874 for (r = 0; r < run; r++) {
1875 kif = LIST_NEXT(V_pf_kifmarker, pfik_allkiflist);
1876 if (kif == NULL) {
1877 LIST_REMOVE(V_pf_kifmarker, pfik_allkiflist);
1878 LIST_INSERT_HEAD(&V_pf_allkiflist, V_pf_kifmarker, pfik_allkiflist);
1879 break;
1880 }
1881
1882 LIST_REMOVE(V_pf_kifmarker, pfik_allkiflist);
1883 LIST_INSERT_AFTER(kif, V_pf_kifmarker, pfik_allkiflist);
1884
1885 for (int i = 0; i < 2; i++) {
1886 for (int j = 0; j < 2; j++) {
1887 for (int k = 0; k < 2; k++) {
1888 pf_counter_u64_periodic(&kif->pfik_packets[i][j][k]);
1889 pf_counter_u64_periodic(&kif->pfik_bytes[i][j][k]);
1890 }
1891 }
1892 }
1893 }
1894 }
1895
1896 static void
pf_rule_counter_u64_periodic(void)1897 pf_rule_counter_u64_periodic(void)
1898 {
1899 struct pf_krule *rule;
1900 size_t r, run;
1901
1902 PF_RULES_RASSERT();
1903
1904 if (__predict_false(V_pf_allrulecount == 0)) {
1905 return;
1906 }
1907
1908 if ((V_pf_counter_periodic_iter % (pf_purge_thread_period * 10 * 300)) != 0) {
1909 return;
1910 }
1911
1912 run = V_pf_allrulecount / 10;
1913 if (run < 5)
1914 run = 5;
1915
1916 for (r = 0; r < run; r++) {
1917 rule = LIST_NEXT(V_pf_rulemarker, allrulelist);
1918 if (rule == NULL) {
1919 LIST_REMOVE(V_pf_rulemarker, allrulelist);
1920 LIST_INSERT_HEAD(&V_pf_allrulelist, V_pf_rulemarker, allrulelist);
1921 break;
1922 }
1923
1924 LIST_REMOVE(V_pf_rulemarker, allrulelist);
1925 LIST_INSERT_AFTER(rule, V_pf_rulemarker, allrulelist);
1926
1927 pf_counter_u64_periodic(&rule->evaluations);
1928 for (int i = 0; i < 2; i++) {
1929 pf_counter_u64_periodic(&rule->packets[i]);
1930 pf_counter_u64_periodic(&rule->bytes[i]);
1931 }
1932 }
1933 }
1934
1935 static void
pf_counter_u64_periodic_main(void)1936 pf_counter_u64_periodic_main(void)
1937 {
1938 PF_RULES_RLOCK_TRACKER;
1939
1940 V_pf_counter_periodic_iter++;
1941
1942 PF_RULES_RLOCK();
1943 pf_counter_u64_critical_enter();
1944 pf_status_counter_u64_periodic();
1945 pf_kif_counter_u64_periodic();
1946 pf_rule_counter_u64_periodic();
1947 pf_counter_u64_critical_exit();
1948 PF_RULES_RUNLOCK();
1949 }
1950 #else
1951 #define pf_counter_u64_periodic_main() do { } while (0)
1952 #endif
1953
1954 void
pf_purge_thread(void * unused __unused)1955 pf_purge_thread(void *unused __unused)
1956 {
1957 struct epoch_tracker et;
1958
1959 VNET_ITERATOR_DECL(vnet_iter);
1960
1961 sx_xlock(&pf_end_lock);
1962 while (pf_end_threads == 0) {
1963 sx_sleep(pf_purge_thread, &pf_end_lock, 0, "pftm", pf_purge_thread_period);
1964
1965 VNET_LIST_RLOCK();
1966 NET_EPOCH_ENTER(et);
1967 VNET_FOREACH(vnet_iter) {
1968 CURVNET_SET(vnet_iter);
1969
1970 /* Wait until V_pf_default_rule is initialized. */
1971 if (V_pf_vnet_active == 0) {
1972 CURVNET_RESTORE();
1973 continue;
1974 }
1975
1976 pf_counter_u64_periodic_main();
1977
1978 /*
1979 * Process 1/interval fraction of the state
1980 * table every run.
1981 */
1982 V_pf_purge_idx =
1983 pf_purge_expired_states(V_pf_purge_idx, pf_hashmask /
1984 (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10));
1985
1986 /*
1987 * Purge other expired types every
1988 * PFTM_INTERVAL seconds.
1989 */
1990 if (V_pf_purge_idx == 0) {
1991 /*
1992 * Order is important:
1993 * - states and src nodes reference rules
1994 * - states and rules reference kifs
1995 */
1996 pf_purge_expired_fragments();
1997 pf_purge_expired_src_nodes();
1998 pf_purge_unlinked_rules();
1999 pfi_kkif_purge();
2000 }
2001 CURVNET_RESTORE();
2002 }
2003 NET_EPOCH_EXIT(et);
2004 VNET_LIST_RUNLOCK();
2005 }
2006
2007 pf_end_threads++;
2008 sx_xunlock(&pf_end_lock);
2009 kproc_exit(0);
2010 }
2011
2012 void
pf_unload_vnet_purge(void)2013 pf_unload_vnet_purge(void)
2014 {
2015
2016 /*
2017 * To cleanse up all kifs and rules we need
2018 * two runs: first one clears reference flags,
2019 * then pf_purge_expired_states() doesn't
2020 * raise them, and then second run frees.
2021 */
2022 pf_purge_unlinked_rules();
2023 pfi_kkif_purge();
2024
2025 /*
2026 * Now purge everything.
2027 */
2028 pf_purge_expired_states(0, pf_hashmask);
2029 pf_purge_fragments(UINT_MAX);
2030 pf_purge_expired_src_nodes();
2031
2032 /*
2033 * Now all kifs & rules should be unreferenced,
2034 * thus should be successfully freed.
2035 */
2036 pf_purge_unlinked_rules();
2037 pfi_kkif_purge();
2038 }
2039
2040 u_int32_t
pf_state_expires(const struct pf_kstate * state)2041 pf_state_expires(const struct pf_kstate *state)
2042 {
2043 u_int32_t timeout;
2044 u_int32_t start;
2045 u_int32_t end;
2046 u_int32_t states;
2047
2048 /* handle all PFTM_* > PFTM_MAX here */
2049 if (state->timeout == PFTM_PURGE)
2050 return (time_uptime);
2051 KASSERT(state->timeout != PFTM_UNLINKED,
2052 ("pf_state_expires: timeout == PFTM_UNLINKED"));
2053 KASSERT((state->timeout < PFTM_MAX),
2054 ("pf_state_expires: timeout > PFTM_MAX"));
2055 timeout = state->rule.ptr->timeout[state->timeout];
2056 if (!timeout)
2057 timeout = V_pf_default_rule.timeout[state->timeout];
2058 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
2059 if (start && state->rule.ptr != &V_pf_default_rule) {
2060 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
2061 states = counter_u64_fetch(state->rule.ptr->states_cur);
2062 } else {
2063 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START];
2064 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END];
2065 states = V_pf_status.states;
2066 }
2067 if (end && states > start && start < end) {
2068 if (states < end) {
2069 timeout = (u_int64_t)timeout * (end - states) /
2070 (end - start);
2071 return ((state->expire / 1000) + timeout);
2072 }
2073 else
2074 return (time_uptime);
2075 }
2076 return ((state->expire / 1000) + timeout);
2077 }
2078
2079 void
pf_purge_expired_src_nodes(void)2080 pf_purge_expired_src_nodes(void)
2081 {
2082 struct pf_ksrc_node_list freelist;
2083 struct pf_srchash *sh;
2084 struct pf_ksrc_node *cur, *next;
2085 int i;
2086
2087 LIST_INIT(&freelist);
2088 for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) {
2089 PF_HASHROW_LOCK(sh);
2090 LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next)
2091 if (cur->states == 0 && cur->expire <= time_uptime) {
2092 pf_unlink_src_node(cur);
2093 LIST_INSERT_HEAD(&freelist, cur, entry);
2094 } else if (cur->rule.ptr != NULL)
2095 cur->rule.ptr->rule_ref |= PFRULE_REFS;
2096 PF_HASHROW_UNLOCK(sh);
2097 }
2098
2099 pf_free_src_nodes(&freelist);
2100
2101 V_pf_status.src_nodes = uma_zone_get_cur(V_pf_sources_z);
2102 }
2103
2104 static void
pf_src_tree_remove_state(struct pf_kstate * s)2105 pf_src_tree_remove_state(struct pf_kstate *s)
2106 {
2107 struct pf_ksrc_node *sn;
2108 uint32_t timeout;
2109
2110 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE] ?
2111 s->rule.ptr->timeout[PFTM_SRC_NODE] :
2112 V_pf_default_rule.timeout[PFTM_SRC_NODE];
2113
2114 if (s->src_node != NULL) {
2115 sn = s->src_node;
2116 PF_SRC_NODE_LOCK(sn);
2117 if (s->src.tcp_est)
2118 --sn->conn;
2119 if (--sn->states == 0)
2120 sn->expire = time_uptime + timeout;
2121 PF_SRC_NODE_UNLOCK(sn);
2122 }
2123 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
2124 sn = s->nat_src_node;
2125 PF_SRC_NODE_LOCK(sn);
2126 if (--sn->states == 0)
2127 sn->expire = time_uptime + timeout;
2128 PF_SRC_NODE_UNLOCK(sn);
2129 }
2130 s->src_node = s->nat_src_node = NULL;
2131 }
2132
2133 /*
2134 * Unlink and potentilly free a state. Function may be
2135 * called with ID hash row locked, but always returns
2136 * unlocked, since it needs to go through key hash locking.
2137 */
2138 int
pf_unlink_state(struct pf_kstate * s)2139 pf_unlink_state(struct pf_kstate *s)
2140 {
2141 struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)];
2142
2143 NET_EPOCH_ASSERT();
2144 PF_HASHROW_ASSERT(ih);
2145
2146 if (s->timeout == PFTM_UNLINKED) {
2147 /*
2148 * State is being processed
2149 * by pf_unlink_state() in
2150 * an other thread.
2151 */
2152 PF_HASHROW_UNLOCK(ih);
2153 return (0); /* XXXGL: undefined actually */
2154 }
2155
2156 if (s->src.state == PF_TCPS_PROXY_DST) {
2157 /* XXX wire key the right one? */
2158 pf_send_tcp(s->rule.ptr, s->key[PF_SK_WIRE]->af,
2159 &s->key[PF_SK_WIRE]->addr[1],
2160 &s->key[PF_SK_WIRE]->addr[0],
2161 s->key[PF_SK_WIRE]->port[1],
2162 s->key[PF_SK_WIRE]->port[0],
2163 s->src.seqhi, s->src.seqlo + 1,
2164 TH_RST|TH_ACK, 0, 0, 0, true, s->tag, 0, s->act.rtableid);
2165 }
2166
2167 LIST_REMOVE(s, entry);
2168 pf_src_tree_remove_state(s);
2169
2170 if (V_pfsync_delete_state_ptr != NULL)
2171 V_pfsync_delete_state_ptr(s);
2172
2173 STATE_DEC_COUNTERS(s);
2174
2175 s->timeout = PFTM_UNLINKED;
2176
2177 /* Ensure we remove it from the list of halfopen states, if needed. */
2178 if (s->key[PF_SK_STACK] != NULL &&
2179 s->key[PF_SK_STACK]->proto == IPPROTO_TCP)
2180 pf_set_protostate(s, PF_PEER_BOTH, TCPS_CLOSED);
2181
2182 PF_HASHROW_UNLOCK(ih);
2183
2184 pf_detach_state(s);
2185 /* pf_state_insert() initialises refs to 2 */
2186 return (pf_release_staten(s, 2));
2187 }
2188
2189 struct pf_kstate *
pf_alloc_state(int flags)2190 pf_alloc_state(int flags)
2191 {
2192
2193 return (uma_zalloc(V_pf_state_z, flags | M_ZERO));
2194 }
2195
2196 void
pf_free_state(struct pf_kstate * cur)2197 pf_free_state(struct pf_kstate *cur)
2198 {
2199 struct pf_krule_item *ri;
2200
2201 KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur));
2202 KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__,
2203 cur->timeout));
2204
2205 while ((ri = SLIST_FIRST(&cur->match_rules))) {
2206 SLIST_REMOVE_HEAD(&cur->match_rules, entry);
2207 free(ri, M_PF_RULE_ITEM);
2208 }
2209
2210 pf_normalize_tcp_cleanup(cur);
2211 uma_zfree(V_pf_state_z, cur);
2212 pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_REMOVALS], 1);
2213 }
2214
2215 /*
2216 * Called only from pf_purge_thread(), thus serialized.
2217 */
2218 static u_int
pf_purge_expired_states(u_int i,int maxcheck)2219 pf_purge_expired_states(u_int i, int maxcheck)
2220 {
2221 struct pf_idhash *ih;
2222 struct pf_kstate *s;
2223 struct pf_krule_item *mrm;
2224 size_t count __unused;
2225
2226 V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
2227
2228 /*
2229 * Go through hash and unlink states that expire now.
2230 */
2231 while (maxcheck > 0) {
2232 count = 0;
2233 ih = &V_pf_idhash[i];
2234
2235 /* only take the lock if we expect to do work */
2236 if (!LIST_EMPTY(&ih->states)) {
2237 relock:
2238 PF_HASHROW_LOCK(ih);
2239 LIST_FOREACH(s, &ih->states, entry) {
2240 if (pf_state_expires(s) <= time_uptime) {
2241 V_pf_status.states -=
2242 pf_unlink_state(s);
2243 goto relock;
2244 }
2245 s->rule.ptr->rule_ref |= PFRULE_REFS;
2246 if (s->nat_rule.ptr != NULL)
2247 s->nat_rule.ptr->rule_ref |= PFRULE_REFS;
2248 if (s->anchor.ptr != NULL)
2249 s->anchor.ptr->rule_ref |= PFRULE_REFS;
2250 s->kif->pfik_flags |= PFI_IFLAG_REFS;
2251 SLIST_FOREACH(mrm, &s->match_rules, entry)
2252 mrm->r->rule_ref |= PFRULE_REFS;
2253 if (s->rt_kif)
2254 s->rt_kif->pfik_flags |= PFI_IFLAG_REFS;
2255 count++;
2256 }
2257 PF_HASHROW_UNLOCK(ih);
2258 }
2259
2260 SDT_PROBE2(pf, purge, state, rowcount, i, count);
2261
2262 /* Return when we hit end of hash. */
2263 if (++i > pf_hashmask) {
2264 V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
2265 return (0);
2266 }
2267
2268 maxcheck--;
2269 }
2270
2271 V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
2272
2273 return (i);
2274 }
2275
2276 static void
pf_purge_unlinked_rules(void)2277 pf_purge_unlinked_rules(void)
2278 {
2279 struct pf_krulequeue tmpq;
2280 struct pf_krule *r, *r1;
2281
2282 /*
2283 * If we have overloading task pending, then we'd
2284 * better skip purging this time. There is a tiny
2285 * probability that overloading task references
2286 * an already unlinked rule.
2287 */
2288 PF_OVERLOADQ_LOCK();
2289 if (!SLIST_EMPTY(&V_pf_overloadqueue)) {
2290 PF_OVERLOADQ_UNLOCK();
2291 return;
2292 }
2293 PF_OVERLOADQ_UNLOCK();
2294
2295 /*
2296 * Do naive mark-and-sweep garbage collecting of old rules.
2297 * Reference flag is raised by pf_purge_expired_states()
2298 * and pf_purge_expired_src_nodes().
2299 *
2300 * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK,
2301 * use a temporary queue.
2302 */
2303 TAILQ_INIT(&tmpq);
2304 PF_UNLNKDRULES_LOCK();
2305 TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) {
2306 if (!(r->rule_ref & PFRULE_REFS)) {
2307 TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries);
2308 TAILQ_INSERT_TAIL(&tmpq, r, entries);
2309 } else
2310 r->rule_ref &= ~PFRULE_REFS;
2311 }
2312 PF_UNLNKDRULES_UNLOCK();
2313
2314 if (!TAILQ_EMPTY(&tmpq)) {
2315 PF_CONFIG_LOCK();
2316 PF_RULES_WLOCK();
2317 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) {
2318 TAILQ_REMOVE(&tmpq, r, entries);
2319 pf_free_rule(r);
2320 }
2321 PF_RULES_WUNLOCK();
2322 PF_CONFIG_UNLOCK();
2323 }
2324 }
2325
2326 void
pf_print_host(struct pf_addr * addr,u_int16_t p,sa_family_t af)2327 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
2328 {
2329 switch (af) {
2330 #ifdef INET
2331 case AF_INET: {
2332 u_int32_t a = ntohl(addr->addr32[0]);
2333 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
2334 (a>>8)&255, a&255);
2335 if (p) {
2336 p = ntohs(p);
2337 printf(":%u", p);
2338 }
2339 break;
2340 }
2341 #endif /* INET */
2342 #ifdef INET6
2343 case AF_INET6: {
2344 u_int16_t b;
2345 u_int8_t i, curstart, curend, maxstart, maxend;
2346 curstart = curend = maxstart = maxend = 255;
2347 for (i = 0; i < 8; i++) {
2348 if (!addr->addr16[i]) {
2349 if (curstart == 255)
2350 curstart = i;
2351 curend = i;
2352 } else {
2353 if ((curend - curstart) >
2354 (maxend - maxstart)) {
2355 maxstart = curstart;
2356 maxend = curend;
2357 }
2358 curstart = curend = 255;
2359 }
2360 }
2361 if ((curend - curstart) >
2362 (maxend - maxstart)) {
2363 maxstart = curstart;
2364 maxend = curend;
2365 }
2366 for (i = 0; i < 8; i++) {
2367 if (i >= maxstart && i <= maxend) {
2368 if (i == 0)
2369 printf(":");
2370 if (i == maxend)
2371 printf(":");
2372 } else {
2373 b = ntohs(addr->addr16[i]);
2374 printf("%x", b);
2375 if (i < 7)
2376 printf(":");
2377 }
2378 }
2379 if (p) {
2380 p = ntohs(p);
2381 printf("[%u]", p);
2382 }
2383 break;
2384 }
2385 #endif /* INET6 */
2386 }
2387 }
2388
2389 void
pf_print_state(struct pf_kstate * s)2390 pf_print_state(struct pf_kstate *s)
2391 {
2392 pf_print_state_parts(s, NULL, NULL);
2393 }
2394
2395 static void
pf_print_state_parts(struct pf_kstate * s,struct pf_state_key * skwp,struct pf_state_key * sksp)2396 pf_print_state_parts(struct pf_kstate *s,
2397 struct pf_state_key *skwp, struct pf_state_key *sksp)
2398 {
2399 struct pf_state_key *skw, *sks;
2400 u_int8_t proto, dir;
2401
2402 /* Do our best to fill these, but they're skipped if NULL */
2403 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL);
2404 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL);
2405 proto = skw ? skw->proto : (sks ? sks->proto : 0);
2406 dir = s ? s->direction : 0;
2407
2408 switch (proto) {
2409 case IPPROTO_IPV4:
2410 printf("IPv4");
2411 break;
2412 case IPPROTO_IPV6:
2413 printf("IPv6");
2414 break;
2415 case IPPROTO_TCP:
2416 printf("TCP");
2417 break;
2418 case IPPROTO_UDP:
2419 printf("UDP");
2420 break;
2421 case IPPROTO_ICMP:
2422 printf("ICMP");
2423 break;
2424 case IPPROTO_ICMPV6:
2425 printf("ICMPv6");
2426 break;
2427 default:
2428 printf("%u", proto);
2429 break;
2430 }
2431 switch (dir) {
2432 case PF_IN:
2433 printf(" in");
2434 break;
2435 case PF_OUT:
2436 printf(" out");
2437 break;
2438 }
2439 if (skw) {
2440 printf(" wire: ");
2441 pf_print_host(&skw->addr[0], skw->port[0], skw->af);
2442 printf(" ");
2443 pf_print_host(&skw->addr[1], skw->port[1], skw->af);
2444 }
2445 if (sks) {
2446 printf(" stack: ");
2447 if (sks != skw) {
2448 pf_print_host(&sks->addr[0], sks->port[0], sks->af);
2449 printf(" ");
2450 pf_print_host(&sks->addr[1], sks->port[1], sks->af);
2451 } else
2452 printf("-");
2453 }
2454 if (s) {
2455 if (proto == IPPROTO_TCP) {
2456 printf(" [lo=%u high=%u win=%u modulator=%u",
2457 s->src.seqlo, s->src.seqhi,
2458 s->src.max_win, s->src.seqdiff);
2459 if (s->src.wscale && s->dst.wscale)
2460 printf(" wscale=%u",
2461 s->src.wscale & PF_WSCALE_MASK);
2462 printf("]");
2463 printf(" [lo=%u high=%u win=%u modulator=%u",
2464 s->dst.seqlo, s->dst.seqhi,
2465 s->dst.max_win, s->dst.seqdiff);
2466 if (s->src.wscale && s->dst.wscale)
2467 printf(" wscale=%u",
2468 s->dst.wscale & PF_WSCALE_MASK);
2469 printf("]");
2470 }
2471 printf(" %u:%u", s->src.state, s->dst.state);
2472 }
2473 }
2474
2475 void
pf_print_flags(u_int8_t f)2476 pf_print_flags(u_int8_t f)
2477 {
2478 if (f)
2479 printf(" ");
2480 if (f & TH_FIN)
2481 printf("F");
2482 if (f & TH_SYN)
2483 printf("S");
2484 if (f & TH_RST)
2485 printf("R");
2486 if (f & TH_PUSH)
2487 printf("P");
2488 if (f & TH_ACK)
2489 printf("A");
2490 if (f & TH_URG)
2491 printf("U");
2492 if (f & TH_ECE)
2493 printf("E");
2494 if (f & TH_CWR)
2495 printf("W");
2496 }
2497
2498 #define PF_SET_SKIP_STEPS(i) \
2499 do { \
2500 while (head[i] != cur) { \
2501 head[i]->skip[i].ptr = cur; \
2502 head[i] = TAILQ_NEXT(head[i], entries); \
2503 } \
2504 } while (0)
2505
2506 void
pf_calc_skip_steps(struct pf_krulequeue * rules)2507 pf_calc_skip_steps(struct pf_krulequeue *rules)
2508 {
2509 struct pf_krule *cur, *prev, *head[PF_SKIP_COUNT];
2510 int i;
2511
2512 cur = TAILQ_FIRST(rules);
2513 prev = cur;
2514 for (i = 0; i < PF_SKIP_COUNT; ++i)
2515 head[i] = cur;
2516 while (cur != NULL) {
2517 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
2518 PF_SET_SKIP_STEPS(PF_SKIP_IFP);
2519 if (cur->direction != prev->direction)
2520 PF_SET_SKIP_STEPS(PF_SKIP_DIR);
2521 if (cur->af != prev->af)
2522 PF_SET_SKIP_STEPS(PF_SKIP_AF);
2523 if (cur->proto != prev->proto)
2524 PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
2525 if (cur->src.neg != prev->src.neg ||
2526 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
2527 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
2528 if (cur->src.port[0] != prev->src.port[0] ||
2529 cur->src.port[1] != prev->src.port[1] ||
2530 cur->src.port_op != prev->src.port_op)
2531 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
2532 if (cur->dst.neg != prev->dst.neg ||
2533 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
2534 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
2535 if (cur->dst.port[0] != prev->dst.port[0] ||
2536 cur->dst.port[1] != prev->dst.port[1] ||
2537 cur->dst.port_op != prev->dst.port_op)
2538 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
2539
2540 prev = cur;
2541 cur = TAILQ_NEXT(cur, entries);
2542 }
2543 for (i = 0; i < PF_SKIP_COUNT; ++i)
2544 PF_SET_SKIP_STEPS(i);
2545 }
2546
2547 int
pf_addr_wrap_neq(struct pf_addr_wrap * aw1,struct pf_addr_wrap * aw2)2548 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
2549 {
2550 if (aw1->type != aw2->type)
2551 return (1);
2552 switch (aw1->type) {
2553 case PF_ADDR_ADDRMASK:
2554 case PF_ADDR_RANGE:
2555 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, AF_INET6))
2556 return (1);
2557 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, AF_INET6))
2558 return (1);
2559 return (0);
2560 case PF_ADDR_DYNIFTL:
2561 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
2562 case PF_ADDR_NOROUTE:
2563 case PF_ADDR_URPFFAILED:
2564 return (0);
2565 case PF_ADDR_TABLE:
2566 return (aw1->p.tbl != aw2->p.tbl);
2567 default:
2568 printf("invalid address type: %d\n", aw1->type);
2569 return (1);
2570 }
2571 }
2572
2573 /**
2574 * Checksum updates are a little complicated because the checksum in the TCP/UDP
2575 * header isn't always a full checksum. In some cases (i.e. output) it's a
2576 * pseudo-header checksum, which is a partial checksum over src/dst IP
2577 * addresses, protocol number and length.
2578 *
2579 * That means we have the following cases:
2580 * * Input or forwarding: we don't have TSO, the checksum fields are full
2581 * checksums, we need to update the checksum whenever we change anything.
2582 * * Output (i.e. the checksum is a pseudo-header checksum):
2583 * x The field being updated is src/dst address or affects the length of
2584 * the packet. We need to update the pseudo-header checksum (note that this
2585 * checksum is not ones' complement).
2586 * x Some other field is being modified (e.g. src/dst port numbers): We
2587 * don't have to update anything.
2588 **/
2589 u_int16_t
pf_cksum_fixup(u_int16_t cksum,u_int16_t old,u_int16_t new,u_int8_t udp)2590 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
2591 {
2592 u_int32_t x;
2593
2594 x = cksum + old - new;
2595 x = (x + (x >> 16)) & 0xffff;
2596
2597 /* optimise: eliminate a branch when not udp */
2598 if (udp && cksum == 0x0000)
2599 return cksum;
2600 if (udp && x == 0x0000)
2601 x = 0xffff;
2602
2603 return (u_int16_t)(x);
2604 }
2605
2606 static void
pf_patch_8(struct mbuf * m,u_int16_t * cksum,u_int8_t * f,u_int8_t v,bool hi,u_int8_t udp)2607 pf_patch_8(struct mbuf *m, u_int16_t *cksum, u_int8_t *f, u_int8_t v, bool hi,
2608 u_int8_t udp)
2609 {
2610 u_int16_t old = htons(hi ? (*f << 8) : *f);
2611 u_int16_t new = htons(hi ? ( v << 8) : v);
2612
2613 if (*f == v)
2614 return;
2615
2616 *f = v;
2617
2618 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6))
2619 return;
2620
2621 *cksum = pf_cksum_fixup(*cksum, old, new, udp);
2622 }
2623
2624 void
pf_patch_16_unaligned(struct mbuf * m,u_int16_t * cksum,void * f,u_int16_t v,bool hi,u_int8_t udp)2625 pf_patch_16_unaligned(struct mbuf *m, u_int16_t *cksum, void *f, u_int16_t v,
2626 bool hi, u_int8_t udp)
2627 {
2628 u_int8_t *fb = (u_int8_t *)f;
2629 u_int8_t *vb = (u_int8_t *)&v;
2630
2631 pf_patch_8(m, cksum, fb++, *vb++, hi, udp);
2632 pf_patch_8(m, cksum, fb++, *vb++, !hi, udp);
2633 }
2634
2635 void
pf_patch_32_unaligned(struct mbuf * m,u_int16_t * cksum,void * f,u_int32_t v,bool hi,u_int8_t udp)2636 pf_patch_32_unaligned(struct mbuf *m, u_int16_t *cksum, void *f, u_int32_t v,
2637 bool hi, u_int8_t udp)
2638 {
2639 u_int8_t *fb = (u_int8_t *)f;
2640 u_int8_t *vb = (u_int8_t *)&v;
2641
2642 pf_patch_8(m, cksum, fb++, *vb++, hi, udp);
2643 pf_patch_8(m, cksum, fb++, *vb++, !hi, udp);
2644 pf_patch_8(m, cksum, fb++, *vb++, hi, udp);
2645 pf_patch_8(m, cksum, fb++, *vb++, !hi, udp);
2646 }
2647
2648 u_int16_t
pf_proto_cksum_fixup(struct mbuf * m,u_int16_t cksum,u_int16_t old,u_int16_t new,u_int8_t udp)2649 pf_proto_cksum_fixup(struct mbuf *m, u_int16_t cksum, u_int16_t old,
2650 u_int16_t new, u_int8_t udp)
2651 {
2652 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6))
2653 return (cksum);
2654
2655 return (pf_cksum_fixup(cksum, old, new, udp));
2656 }
2657
2658 static void
pf_change_ap(struct mbuf * m,struct pf_addr * a,u_int16_t * p,u_int16_t * ic,u_int16_t * pc,struct pf_addr * an,u_int16_t pn,u_int8_t u,sa_family_t af)2659 pf_change_ap(struct mbuf *m, struct pf_addr *a, u_int16_t *p, u_int16_t *ic,
2660 u_int16_t *pc, struct pf_addr *an, u_int16_t pn, u_int8_t u,
2661 sa_family_t af)
2662 {
2663 struct pf_addr ao;
2664 u_int16_t po = *p;
2665
2666 PF_ACPY(&ao, a, af);
2667 PF_ACPY(a, an, af);
2668
2669 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6))
2670 *pc = ~*pc;
2671
2672 *p = pn;
2673
2674 switch (af) {
2675 #ifdef INET
2676 case AF_INET:
2677 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
2678 ao.addr16[0], an->addr16[0], 0),
2679 ao.addr16[1], an->addr16[1], 0);
2680 *p = pn;
2681
2682 *pc = pf_cksum_fixup(pf_cksum_fixup(*pc,
2683 ao.addr16[0], an->addr16[0], u),
2684 ao.addr16[1], an->addr16[1], u);
2685
2686 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u);
2687 break;
2688 #endif /* INET */
2689 #ifdef INET6
2690 case AF_INET6:
2691 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2692 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2693 pf_cksum_fixup(pf_cksum_fixup(*pc,
2694 ao.addr16[0], an->addr16[0], u),
2695 ao.addr16[1], an->addr16[1], u),
2696 ao.addr16[2], an->addr16[2], u),
2697 ao.addr16[3], an->addr16[3], u),
2698 ao.addr16[4], an->addr16[4], u),
2699 ao.addr16[5], an->addr16[5], u),
2700 ao.addr16[6], an->addr16[6], u),
2701 ao.addr16[7], an->addr16[7], u);
2702
2703 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u);
2704 break;
2705 #endif /* INET6 */
2706 }
2707
2708 if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA |
2709 CSUM_DELAY_DATA_IPV6)) {
2710 *pc = ~*pc;
2711 if (! *pc)
2712 *pc = 0xffff;
2713 }
2714 }
2715
2716 /* Changes a u_int32_t. Uses a void * so there are no align restrictions */
2717 void
pf_change_a(void * a,u_int16_t * c,u_int32_t an,u_int8_t u)2718 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
2719 {
2720 u_int32_t ao;
2721
2722 memcpy(&ao, a, sizeof(ao));
2723 memcpy(a, &an, sizeof(u_int32_t));
2724 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
2725 ao % 65536, an % 65536, u);
2726 }
2727
2728 void
pf_change_proto_a(struct mbuf * m,void * a,u_int16_t * c,u_int32_t an,u_int8_t udp)2729 pf_change_proto_a(struct mbuf *m, void *a, u_int16_t *c, u_int32_t an, u_int8_t udp)
2730 {
2731 u_int32_t ao;
2732
2733 memcpy(&ao, a, sizeof(ao));
2734 memcpy(a, &an, sizeof(u_int32_t));
2735
2736 *c = pf_proto_cksum_fixup(m,
2737 pf_proto_cksum_fixup(m, *c, ao / 65536, an / 65536, udp),
2738 ao % 65536, an % 65536, udp);
2739 }
2740
2741 #ifdef INET6
2742 static void
pf_change_a6(struct pf_addr * a,u_int16_t * c,struct pf_addr * an,u_int8_t u)2743 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
2744 {
2745 struct pf_addr ao;
2746
2747 PF_ACPY(&ao, a, AF_INET6);
2748 PF_ACPY(a, an, AF_INET6);
2749
2750 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2751 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2752 pf_cksum_fixup(pf_cksum_fixup(*c,
2753 ao.addr16[0], an->addr16[0], u),
2754 ao.addr16[1], an->addr16[1], u),
2755 ao.addr16[2], an->addr16[2], u),
2756 ao.addr16[3], an->addr16[3], u),
2757 ao.addr16[4], an->addr16[4], u),
2758 ao.addr16[5], an->addr16[5], u),
2759 ao.addr16[6], an->addr16[6], u),
2760 ao.addr16[7], an->addr16[7], u);
2761 }
2762 #endif /* INET6 */
2763
2764 static void
pf_change_icmp(struct pf_addr * ia,u_int16_t * ip,struct pf_addr * oa,struct pf_addr * na,u_int16_t np,u_int16_t * pc,u_int16_t * h2c,u_int16_t * ic,u_int16_t * hc,u_int8_t u,sa_family_t af)2765 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
2766 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
2767 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
2768 {
2769 struct pf_addr oia, ooa;
2770
2771 PF_ACPY(&oia, ia, af);
2772 if (oa)
2773 PF_ACPY(&ooa, oa, af);
2774
2775 /* Change inner protocol port, fix inner protocol checksum. */
2776 if (ip != NULL) {
2777 u_int16_t oip = *ip;
2778 u_int32_t opc;
2779
2780 if (pc != NULL)
2781 opc = *pc;
2782 *ip = np;
2783 if (pc != NULL)
2784 *pc = pf_cksum_fixup(*pc, oip, *ip, u);
2785 *ic = pf_cksum_fixup(*ic, oip, *ip, 0);
2786 if (pc != NULL)
2787 *ic = pf_cksum_fixup(*ic, opc, *pc, 0);
2788 }
2789 /* Change inner ip address, fix inner ip and icmp checksums. */
2790 PF_ACPY(ia, na, af);
2791 switch (af) {
2792 #ifdef INET
2793 case AF_INET: {
2794 u_int32_t oh2c = *h2c;
2795
2796 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
2797 oia.addr16[0], ia->addr16[0], 0),
2798 oia.addr16[1], ia->addr16[1], 0);
2799 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
2800 oia.addr16[0], ia->addr16[0], 0),
2801 oia.addr16[1], ia->addr16[1], 0);
2802 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
2803 break;
2804 }
2805 #endif /* INET */
2806 #ifdef INET6
2807 case AF_INET6:
2808 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2809 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2810 pf_cksum_fixup(pf_cksum_fixup(*ic,
2811 oia.addr16[0], ia->addr16[0], u),
2812 oia.addr16[1], ia->addr16[1], u),
2813 oia.addr16[2], ia->addr16[2], u),
2814 oia.addr16[3], ia->addr16[3], u),
2815 oia.addr16[4], ia->addr16[4], u),
2816 oia.addr16[5], ia->addr16[5], u),
2817 oia.addr16[6], ia->addr16[6], u),
2818 oia.addr16[7], ia->addr16[7], u);
2819 break;
2820 #endif /* INET6 */
2821 }
2822 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */
2823 if (oa) {
2824 PF_ACPY(oa, na, af);
2825 switch (af) {
2826 #ifdef INET
2827 case AF_INET:
2828 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
2829 ooa.addr16[0], oa->addr16[0], 0),
2830 ooa.addr16[1], oa->addr16[1], 0);
2831 break;
2832 #endif /* INET */
2833 #ifdef INET6
2834 case AF_INET6:
2835 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2836 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2837 pf_cksum_fixup(pf_cksum_fixup(*ic,
2838 ooa.addr16[0], oa->addr16[0], u),
2839 ooa.addr16[1], oa->addr16[1], u),
2840 ooa.addr16[2], oa->addr16[2], u),
2841 ooa.addr16[3], oa->addr16[3], u),
2842 ooa.addr16[4], oa->addr16[4], u),
2843 ooa.addr16[5], oa->addr16[5], u),
2844 ooa.addr16[6], oa->addr16[6], u),
2845 ooa.addr16[7], oa->addr16[7], u);
2846 break;
2847 #endif /* INET6 */
2848 }
2849 }
2850 }
2851
2852 /*
2853 * Need to modulate the sequence numbers in the TCP SACK option
2854 * (credits to Krzysztof Pfaff for report and patch)
2855 */
2856 static int
pf_modulate_sack(struct mbuf * m,int off,struct pf_pdesc * pd,struct tcphdr * th,struct pf_state_peer * dst)2857 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd,
2858 struct tcphdr *th, struct pf_state_peer *dst)
2859 {
2860 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen;
2861 u_int8_t opts[TCP_MAXOLEN], *opt = opts;
2862 int copyback = 0, i, olen;
2863 struct sackblk sack;
2864
2865 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2)
2866 if (hlen < TCPOLEN_SACKLEN ||
2867 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af))
2868 return 0;
2869
2870 while (hlen >= TCPOLEN_SACKLEN) {
2871 size_t startoff = opt - opts;
2872 olen = opt[1];
2873 switch (*opt) {
2874 case TCPOPT_EOL: /* FALLTHROUGH */
2875 case TCPOPT_NOP:
2876 opt++;
2877 hlen--;
2878 break;
2879 case TCPOPT_SACK:
2880 if (olen > hlen)
2881 olen = hlen;
2882 if (olen >= TCPOLEN_SACKLEN) {
2883 for (i = 2; i + TCPOLEN_SACK <= olen;
2884 i += TCPOLEN_SACK) {
2885 memcpy(&sack, &opt[i], sizeof(sack));
2886 pf_patch_32_unaligned(m,
2887 &th->th_sum, &sack.start,
2888 htonl(ntohl(sack.start) - dst->seqdiff),
2889 PF_ALGNMNT(startoff),
2890 0);
2891 pf_patch_32_unaligned(m, &th->th_sum,
2892 &sack.end,
2893 htonl(ntohl(sack.end) - dst->seqdiff),
2894 PF_ALGNMNT(startoff),
2895 0);
2896 memcpy(&opt[i], &sack, sizeof(sack));
2897 }
2898 copyback = 1;
2899 }
2900 /* FALLTHROUGH */
2901 default:
2902 if (olen < 2)
2903 olen = 2;
2904 hlen -= olen;
2905 opt += olen;
2906 }
2907 }
2908
2909 if (copyback)
2910 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts);
2911 return (copyback);
2912 }
2913
2914 struct mbuf *
pf_build_tcp(const struct pf_krule * r,sa_family_t af,const struct pf_addr * saddr,const struct pf_addr * daddr,u_int16_t sport,u_int16_t dport,u_int32_t seq,u_int32_t ack,u_int8_t tcp_flags,u_int16_t win,u_int16_t mss,u_int8_t ttl,bool skip_firewall,u_int16_t mtag_tag,u_int16_t mtag_flags,int rtableid)2915 pf_build_tcp(const struct pf_krule *r, sa_family_t af,
2916 const struct pf_addr *saddr, const struct pf_addr *daddr,
2917 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
2918 u_int8_t tcp_flags, u_int16_t win, u_int16_t mss, u_int8_t ttl,
2919 bool skip_firewall, u_int16_t mtag_tag, u_int16_t mtag_flags, int rtableid)
2920 {
2921 struct mbuf *m;
2922 int len, tlen;
2923 #ifdef INET
2924 struct ip *h = NULL;
2925 #endif /* INET */
2926 #ifdef INET6
2927 struct ip6_hdr *h6 = NULL;
2928 #endif /* INET6 */
2929 struct tcphdr *th;
2930 char *opt;
2931 struct pf_mtag *pf_mtag;
2932
2933 len = 0;
2934 th = NULL;
2935
2936 /* maximum segment size tcp option */
2937 tlen = sizeof(struct tcphdr);
2938 if (mss)
2939 tlen += 4;
2940
2941 switch (af) {
2942 #ifdef INET
2943 case AF_INET:
2944 len = sizeof(struct ip) + tlen;
2945 break;
2946 #endif /* INET */
2947 #ifdef INET6
2948 case AF_INET6:
2949 len = sizeof(struct ip6_hdr) + tlen;
2950 break;
2951 #endif /* INET6 */
2952 default:
2953 panic("%s: unsupported af %d", __func__, af);
2954 }
2955
2956 m = m_gethdr(M_NOWAIT, MT_DATA);
2957 if (m == NULL)
2958 return (NULL);
2959
2960 #ifdef MAC
2961 mac_netinet_firewall_send(m);
2962 #endif
2963 if ((pf_mtag = pf_get_mtag(m)) == NULL) {
2964 m_freem(m);
2965 return (NULL);
2966 }
2967 if (skip_firewall)
2968 m->m_flags |= M_SKIP_FIREWALL;
2969 pf_mtag->tag = mtag_tag;
2970 pf_mtag->flags = mtag_flags;
2971
2972 if (rtableid >= 0)
2973 M_SETFIB(m, rtableid);
2974
2975 #ifdef ALTQ
2976 if (r != NULL && r->qid) {
2977 pf_mtag->qid = r->qid;
2978
2979 /* add hints for ecn */
2980 pf_mtag->hdr = mtod(m, struct ip *);
2981 }
2982 #endif /* ALTQ */
2983 m->m_data += max_linkhdr;
2984 m->m_pkthdr.len = m->m_len = len;
2985 /* The rest of the stack assumes a rcvif, so provide one.
2986 * This is a locally generated packet, so .. close enough. */
2987 m->m_pkthdr.rcvif = V_loif;
2988 bzero(m->m_data, len);
2989 switch (af) {
2990 #ifdef INET
2991 case AF_INET:
2992 h = mtod(m, struct ip *);
2993
2994 /* IP header fields included in the TCP checksum */
2995 h->ip_p = IPPROTO_TCP;
2996 h->ip_len = htons(tlen);
2997 h->ip_src.s_addr = saddr->v4.s_addr;
2998 h->ip_dst.s_addr = daddr->v4.s_addr;
2999
3000 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
3001 break;
3002 #endif /* INET */
3003 #ifdef INET6
3004 case AF_INET6:
3005 h6 = mtod(m, struct ip6_hdr *);
3006
3007 /* IP header fields included in the TCP checksum */
3008 h6->ip6_nxt = IPPROTO_TCP;
3009 h6->ip6_plen = htons(tlen);
3010 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
3011 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
3012
3013 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
3014 break;
3015 #endif /* INET6 */
3016 }
3017
3018 /* TCP header */
3019 th->th_sport = sport;
3020 th->th_dport = dport;
3021 th->th_seq = htonl(seq);
3022 th->th_ack = htonl(ack);
3023 th->th_off = tlen >> 2;
3024 th->th_flags = tcp_flags;
3025 th->th_win = htons(win);
3026
3027 if (mss) {
3028 opt = (char *)(th + 1);
3029 opt[0] = TCPOPT_MAXSEG;
3030 opt[1] = 4;
3031 HTONS(mss);
3032 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
3033 }
3034
3035 switch (af) {
3036 #ifdef INET
3037 case AF_INET:
3038 /* TCP checksum */
3039 th->th_sum = in_cksum(m, len);
3040
3041 /* Finish the IP header */
3042 h->ip_v = 4;
3043 h->ip_hl = sizeof(*h) >> 2;
3044 h->ip_tos = IPTOS_LOWDELAY;
3045 h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0);
3046 h->ip_len = htons(len);
3047 h->ip_ttl = ttl ? ttl : V_ip_defttl;
3048 h->ip_sum = 0;
3049 break;
3050 #endif /* INET */
3051 #ifdef INET6
3052 case AF_INET6:
3053 /* TCP checksum */
3054 th->th_sum = in6_cksum(m, IPPROTO_TCP,
3055 sizeof(struct ip6_hdr), tlen);
3056
3057 h6->ip6_vfc |= IPV6_VERSION;
3058 h6->ip6_hlim = IPV6_DEFHLIM;
3059 break;
3060 #endif /* INET6 */
3061 }
3062
3063 return (m);
3064 }
3065
3066 static void
pf_send_sctp_abort(sa_family_t af,struct pf_pdesc * pd,uint8_t ttl,int rtableid)3067 pf_send_sctp_abort(sa_family_t af, struct pf_pdesc *pd,
3068 uint8_t ttl, int rtableid)
3069 {
3070 struct mbuf *m;
3071 #ifdef INET
3072 struct ip *h = NULL;
3073 #endif /* INET */
3074 #ifdef INET6
3075 struct ip6_hdr *h6 = NULL;
3076 #endif /* INET6 */
3077 struct sctphdr *hdr;
3078 struct sctp_chunkhdr *chunk;
3079 struct pf_send_entry *pfse;
3080 int off = 0;
3081
3082 MPASS(af == pd->af);
3083
3084 m = m_gethdr(M_NOWAIT, MT_DATA);
3085 if (m == NULL)
3086 return;
3087
3088 m->m_data += max_linkhdr;
3089 m->m_flags |= M_SKIP_FIREWALL;
3090 /* The rest of the stack assumes a rcvif, so provide one.
3091 * This is a locally generated packet, so .. close enough. */
3092 m->m_pkthdr.rcvif = V_loif;
3093
3094 /* IPv4|6 header */
3095 switch (af) {
3096 #ifdef INET
3097 case AF_INET:
3098 bzero(m->m_data, sizeof(struct ip) + sizeof(*hdr) + sizeof(*chunk));
3099
3100 h = mtod(m, struct ip *);
3101
3102 /* IP header fields included in the TCP checksum */
3103
3104 h->ip_p = IPPROTO_SCTP;
3105 h->ip_len = htons(sizeof(*h) + sizeof(*hdr) + sizeof(*chunk));
3106 h->ip_ttl = ttl ? ttl : V_ip_defttl;
3107 h->ip_src = pd->dst->v4;
3108 h->ip_dst = pd->src->v4;
3109
3110 off += sizeof(struct ip);
3111 break;
3112 #endif /* INET */
3113 #ifdef INET6
3114 case AF_INET6:
3115 bzero(m->m_data, sizeof(struct ip6_hdr) + sizeof(*hdr) + sizeof(*chunk));
3116
3117 h6 = mtod(m, struct ip6_hdr *);
3118
3119 /* IP header fields included in the TCP checksum */
3120 h6->ip6_vfc |= IPV6_VERSION;
3121 h6->ip6_nxt = IPPROTO_SCTP;
3122 h6->ip6_plen = htons(sizeof(*h6) + sizeof(*hdr) + sizeof(*chunk));
3123 h6->ip6_hlim = ttl ? ttl : V_ip6_defhlim;
3124 memcpy(&h6->ip6_src, &pd->dst->v6, sizeof(struct in6_addr));
3125 memcpy(&h6->ip6_dst, &pd->src->v6, sizeof(struct in6_addr));
3126
3127 off += sizeof(struct ip6_hdr);
3128 break;
3129 #endif /* INET6 */
3130 }
3131
3132 /* SCTP header */
3133 hdr = mtodo(m, off);
3134
3135 hdr->src_port = pd->hdr.sctp.dest_port;
3136 hdr->dest_port = pd->hdr.sctp.src_port;
3137 hdr->v_tag = pd->sctp_initiate_tag;
3138 hdr->checksum = 0;
3139
3140 /* Abort chunk. */
3141 off += sizeof(struct sctphdr);
3142 chunk = mtodo(m, off);
3143
3144 chunk->chunk_type = SCTP_ABORT_ASSOCIATION;
3145 chunk->chunk_length = htons(sizeof(*chunk));
3146
3147 /* SCTP checksum */
3148 off += sizeof(*chunk);
3149 m->m_pkthdr.len = m->m_len = off;
3150
3151 pf_sctp_checksum(m, off - sizeof(*hdr) - sizeof(*chunk));
3152
3153 if (rtableid >= 0)
3154 M_SETFIB(m, rtableid);
3155
3156 /* Allocate outgoing queue entry, mbuf and mbuf tag. */
3157 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT);
3158 if (pfse == NULL) {
3159 m_freem(m);
3160 return;
3161 }
3162
3163 switch (af) {
3164 #ifdef INET
3165 case AF_INET:
3166 pfse->pfse_type = PFSE_IP;
3167 break;
3168 #endif /* INET */
3169 #ifdef INET6
3170 case AF_INET6:
3171 pfse->pfse_type = PFSE_IP6;
3172 break;
3173 #endif /* INET6 */
3174 }
3175
3176 pfse->pfse_m = m;
3177 pf_send(pfse);
3178 }
3179
3180 void
pf_send_tcp(const struct pf_krule * r,sa_family_t af,const struct pf_addr * saddr,const struct pf_addr * daddr,u_int16_t sport,u_int16_t dport,u_int32_t seq,u_int32_t ack,u_int8_t tcp_flags,u_int16_t win,u_int16_t mss,u_int8_t ttl,bool skip_firewall,u_int16_t mtag_tag,u_int16_t mtag_flags,int rtableid)3181 pf_send_tcp(const struct pf_krule *r, sa_family_t af,
3182 const struct pf_addr *saddr, const struct pf_addr *daddr,
3183 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
3184 u_int8_t tcp_flags, u_int16_t win, u_int16_t mss, u_int8_t ttl,
3185 bool skip_firewall, u_int16_t mtag_tag, u_int16_t mtag_flags, int rtableid)
3186 {
3187 struct pf_send_entry *pfse;
3188 struct mbuf *m;
3189
3190 m = pf_build_tcp(r, af, saddr, daddr, sport, dport, seq, ack, tcp_flags,
3191 win, mss, ttl, skip_firewall, mtag_tag, mtag_flags, rtableid);
3192 if (m == NULL)
3193 return;
3194
3195 /* Allocate outgoing queue entry, mbuf and mbuf tag. */
3196 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT);
3197 if (pfse == NULL) {
3198 m_freem(m);
3199 return;
3200 }
3201
3202 switch (af) {
3203 #ifdef INET
3204 case AF_INET:
3205 pfse->pfse_type = PFSE_IP;
3206 break;
3207 #endif /* INET */
3208 #ifdef INET6
3209 case AF_INET6:
3210 pfse->pfse_type = PFSE_IP6;
3211 break;
3212 #endif /* INET6 */
3213 }
3214
3215 pfse->pfse_m = m;
3216 pf_send(pfse);
3217 }
3218
3219 static void
pf_return(struct pf_krule * r,struct pf_krule * nr,struct pf_pdesc * pd,struct pf_state_key * sk,int off,struct mbuf * m,struct tcphdr * th,struct pfi_kkif * kif,u_int16_t bproto_sum,u_int16_t bip_sum,int hdrlen,u_short * reason,int rtableid)3220 pf_return(struct pf_krule *r, struct pf_krule *nr, struct pf_pdesc *pd,
3221 struct pf_state_key *sk, int off, struct mbuf *m, struct tcphdr *th,
3222 struct pfi_kkif *kif, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen,
3223 u_short *reason, int rtableid)
3224 {
3225 struct pf_addr * const saddr = pd->src;
3226 struct pf_addr * const daddr = pd->dst;
3227 sa_family_t af = pd->af;
3228
3229 /* undo NAT changes, if they have taken place */
3230 if (nr != NULL) {
3231 PF_ACPY(saddr, &sk->addr[pd->sidx], af);
3232 PF_ACPY(daddr, &sk->addr[pd->didx], af);
3233 if (pd->sport)
3234 *pd->sport = sk->port[pd->sidx];
3235 if (pd->dport)
3236 *pd->dport = sk->port[pd->didx];
3237 if (pd->proto_sum)
3238 *pd->proto_sum = bproto_sum;
3239 if (pd->ip_sum)
3240 *pd->ip_sum = bip_sum;
3241 m_copyback(m, off, hdrlen, pd->hdr.any);
3242 }
3243 if (pd->proto == IPPROTO_TCP &&
3244 ((r->rule_flag & PFRULE_RETURNRST) ||
3245 (r->rule_flag & PFRULE_RETURN)) &&
3246 !(th->th_flags & TH_RST)) {
3247 u_int32_t ack = ntohl(th->th_seq) + pd->p_len;
3248 int len = 0;
3249 #ifdef INET
3250 struct ip *h4;
3251 #endif
3252 #ifdef INET6
3253 struct ip6_hdr *h6;
3254 #endif
3255
3256 switch (af) {
3257 #ifdef INET
3258 case AF_INET:
3259 h4 = mtod(m, struct ip *);
3260 len = ntohs(h4->ip_len) - off;
3261 break;
3262 #endif
3263 #ifdef INET6
3264 case AF_INET6:
3265 h6 = mtod(m, struct ip6_hdr *);
3266 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6));
3267 break;
3268 #endif
3269 }
3270
3271 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af))
3272 REASON_SET(reason, PFRES_PROTCKSUM);
3273 else {
3274 if (th->th_flags & TH_SYN)
3275 ack++;
3276 if (th->th_flags & TH_FIN)
3277 ack++;
3278 pf_send_tcp(r, af, pd->dst,
3279 pd->src, th->th_dport, th->th_sport,
3280 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
3281 r->return_ttl, true, 0, 0, rtableid);
3282 }
3283 } else if (pd->proto == IPPROTO_SCTP &&
3284 (r->rule_flag & PFRULE_RETURN)) {
3285 pf_send_sctp_abort(af, pd, r->return_ttl, rtableid);
3286 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET &&
3287 r->return_icmp)
3288 pf_send_icmp(m, r->return_icmp >> 8,
3289 r->return_icmp & 255, af, r, rtableid);
3290 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 &&
3291 r->return_icmp6)
3292 pf_send_icmp(m, r->return_icmp6 >> 8,
3293 r->return_icmp6 & 255, af, r, rtableid);
3294 }
3295
3296 static int
pf_match_ieee8021q_pcp(u_int8_t prio,struct mbuf * m)3297 pf_match_ieee8021q_pcp(u_int8_t prio, struct mbuf *m)
3298 {
3299 struct m_tag *mtag;
3300 u_int8_t mpcp;
3301
3302 mtag = m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_IN, NULL);
3303 if (mtag == NULL)
3304 return (0);
3305
3306 if (prio == PF_PRIO_ZERO)
3307 prio = 0;
3308
3309 mpcp = *(uint8_t *)(mtag + 1);
3310
3311 return (mpcp == prio);
3312 }
3313
3314 static int
pf_icmp_to_bandlim(uint8_t type)3315 pf_icmp_to_bandlim(uint8_t type)
3316 {
3317 switch (type) {
3318 case ICMP_ECHO:
3319 case ICMP_ECHOREPLY:
3320 return (BANDLIM_ICMP_ECHO);
3321 case ICMP_TSTAMP:
3322 case ICMP_TSTAMPREPLY:
3323 return (BANDLIM_ICMP_TSTAMP);
3324 case ICMP_UNREACH:
3325 default:
3326 return (BANDLIM_ICMP_UNREACH);
3327 }
3328 }
3329
3330 static void
pf_send_icmp(struct mbuf * m,u_int8_t type,u_int8_t code,sa_family_t af,struct pf_krule * r,int rtableid)3331 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
3332 struct pf_krule *r, int rtableid)
3333 {
3334 struct pf_send_entry *pfse;
3335 struct mbuf *m0;
3336 struct pf_mtag *pf_mtag;
3337
3338 /* ICMP packet rate limitation. */
3339 #ifdef INET6
3340 if (af == AF_INET6) {
3341 if (icmp6_ratelimit(NULL, type, code))
3342 return;
3343 }
3344 #endif
3345 #ifdef INET
3346 if (af == AF_INET) {
3347 if (badport_bandlim(pf_icmp_to_bandlim(type)) != 0)
3348 return;
3349 }
3350 #endif
3351
3352 /* Allocate outgoing queue entry, mbuf and mbuf tag. */
3353 pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT);
3354 if (pfse == NULL)
3355 return;
3356
3357 if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) {
3358 free(pfse, M_PFTEMP);
3359 return;
3360 }
3361
3362 if ((pf_mtag = pf_get_mtag(m0)) == NULL) {
3363 free(pfse, M_PFTEMP);
3364 return;
3365 }
3366 /* XXX: revisit */
3367 m0->m_flags |= M_SKIP_FIREWALL;
3368
3369 if (rtableid >= 0)
3370 M_SETFIB(m0, rtableid);
3371
3372 #ifdef ALTQ
3373 if (r->qid) {
3374 pf_mtag->qid = r->qid;
3375 /* add hints for ecn */
3376 pf_mtag->hdr = mtod(m0, struct ip *);
3377 }
3378 #endif /* ALTQ */
3379
3380 switch (af) {
3381 #ifdef INET
3382 case AF_INET:
3383 pfse->pfse_type = PFSE_ICMP;
3384 break;
3385 #endif /* INET */
3386 #ifdef INET6
3387 case AF_INET6:
3388 pfse->pfse_type = PFSE_ICMP6;
3389 break;
3390 #endif /* INET6 */
3391 }
3392 pfse->pfse_m = m0;
3393 pfse->icmpopts.type = type;
3394 pfse->icmpopts.code = code;
3395 pf_send(pfse);
3396 }
3397
3398 /*
3399 * Return 1 if the addresses a and b match (with mask m), otherwise return 0.
3400 * If n is 0, they match if they are equal. If n is != 0, they match if they
3401 * are different.
3402 */
3403 int
pf_match_addr(u_int8_t n,struct pf_addr * a,struct pf_addr * m,struct pf_addr * b,sa_family_t af)3404 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
3405 struct pf_addr *b, sa_family_t af)
3406 {
3407 int match = 0;
3408
3409 switch (af) {
3410 #ifdef INET
3411 case AF_INET:
3412 if (IN_ARE_MASKED_ADDR_EQUAL(a->v4, b->v4, m->v4))
3413 match++;
3414 break;
3415 #endif /* INET */
3416 #ifdef INET6
3417 case AF_INET6:
3418 if (IN6_ARE_MASKED_ADDR_EQUAL(&a->v6, &b->v6, &m->v6))
3419 match++;
3420 break;
3421 #endif /* INET6 */
3422 }
3423 if (match) {
3424 if (n)
3425 return (0);
3426 else
3427 return (1);
3428 } else {
3429 if (n)
3430 return (1);
3431 else
3432 return (0);
3433 }
3434 }
3435
3436 /*
3437 * Return 1 if b <= a <= e, otherwise return 0.
3438 */
3439 int
pf_match_addr_range(struct pf_addr * b,struct pf_addr * e,struct pf_addr * a,sa_family_t af)3440 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e,
3441 struct pf_addr *a, sa_family_t af)
3442 {
3443 switch (af) {
3444 #ifdef INET
3445 case AF_INET:
3446 if ((ntohl(a->addr32[0]) < ntohl(b->addr32[0])) ||
3447 (ntohl(a->addr32[0]) > ntohl(e->addr32[0])))
3448 return (0);
3449 break;
3450 #endif /* INET */
3451 #ifdef INET6
3452 case AF_INET6: {
3453 int i;
3454
3455 /* check a >= b */
3456 for (i = 0; i < 4; ++i)
3457 if (ntohl(a->addr32[i]) > ntohl(b->addr32[i]))
3458 break;
3459 else if (ntohl(a->addr32[i]) < ntohl(b->addr32[i]))
3460 return (0);
3461 /* check a <= e */
3462 for (i = 0; i < 4; ++i)
3463 if (ntohl(a->addr32[i]) < ntohl(e->addr32[i]))
3464 break;
3465 else if (ntohl(a->addr32[i]) > ntohl(e->addr32[i]))
3466 return (0);
3467 break;
3468 }
3469 #endif /* INET6 */
3470 }
3471 return (1);
3472 }
3473
3474 static int
pf_match(u_int8_t op,u_int32_t a1,u_int32_t a2,u_int32_t p)3475 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
3476 {
3477 switch (op) {
3478 case PF_OP_IRG:
3479 return ((p > a1) && (p < a2));
3480 case PF_OP_XRG:
3481 return ((p < a1) || (p > a2));
3482 case PF_OP_RRG:
3483 return ((p >= a1) && (p <= a2));
3484 case PF_OP_EQ:
3485 return (p == a1);
3486 case PF_OP_NE:
3487 return (p != a1);
3488 case PF_OP_LT:
3489 return (p < a1);
3490 case PF_OP_LE:
3491 return (p <= a1);
3492 case PF_OP_GT:
3493 return (p > a1);
3494 case PF_OP_GE:
3495 return (p >= a1);
3496 }
3497 return (0); /* never reached */
3498 }
3499
3500 int
pf_match_port(u_int8_t op,u_int16_t a1,u_int16_t a2,u_int16_t p)3501 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
3502 {
3503 NTOHS(a1);
3504 NTOHS(a2);
3505 NTOHS(p);
3506 return (pf_match(op, a1, a2, p));
3507 }
3508
3509 static int
pf_match_uid(u_int8_t op,uid_t a1,uid_t a2,uid_t u)3510 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
3511 {
3512 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
3513 return (0);
3514 return (pf_match(op, a1, a2, u));
3515 }
3516
3517 static int
pf_match_gid(u_int8_t op,gid_t a1,gid_t a2,gid_t g)3518 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
3519 {
3520 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
3521 return (0);
3522 return (pf_match(op, a1, a2, g));
3523 }
3524
3525 int
pf_match_tag(struct mbuf * m,struct pf_krule * r,int * tag,int mtag)3526 pf_match_tag(struct mbuf *m, struct pf_krule *r, int *tag, int mtag)
3527 {
3528 if (*tag == -1)
3529 *tag = mtag;
3530
3531 return ((!r->match_tag_not && r->match_tag == *tag) ||
3532 (r->match_tag_not && r->match_tag != *tag));
3533 }
3534
3535 int
pf_tag_packet(struct mbuf * m,struct pf_pdesc * pd,int tag)3536 pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag)
3537 {
3538
3539 KASSERT(tag > 0, ("%s: tag %d", __func__, tag));
3540
3541 if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL))
3542 return (ENOMEM);
3543
3544 pd->pf_mtag->tag = tag;
3545
3546 return (0);
3547 }
3548
3549 #define PF_ANCHOR_STACKSIZE 32
3550 struct pf_kanchor_stackframe {
3551 struct pf_kruleset *rs;
3552 struct pf_krule *r; /* XXX: + match bit */
3553 struct pf_kanchor *child;
3554 };
3555
3556 /*
3557 * XXX: We rely on malloc(9) returning pointer aligned addresses.
3558 */
3559 #define PF_ANCHORSTACK_MATCH 0x00000001
3560 #define PF_ANCHORSTACK_MASK (PF_ANCHORSTACK_MATCH)
3561
3562 #define PF_ANCHOR_MATCH(f) ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH)
3563 #define PF_ANCHOR_RULE(f) (struct pf_krule *) \
3564 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK)
3565 #define PF_ANCHOR_SET_MATCH(f) do { (f)->r = (void *) \
3566 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH); \
3567 } while (0)
3568
3569 void
pf_step_into_anchor(struct pf_kanchor_stackframe * stack,int * depth,struct pf_kruleset ** rs,int n,struct pf_krule ** r,struct pf_krule ** a,int * match)3570 pf_step_into_anchor(struct pf_kanchor_stackframe *stack, int *depth,
3571 struct pf_kruleset **rs, int n, struct pf_krule **r, struct pf_krule **a,
3572 int *match)
3573 {
3574 struct pf_kanchor_stackframe *f;
3575
3576 PF_RULES_RASSERT();
3577
3578 if (match)
3579 *match = 0;
3580 if (*depth >= PF_ANCHOR_STACKSIZE) {
3581 printf("%s: anchor stack overflow on %s\n",
3582 __func__, (*r)->anchor->name);
3583 *r = TAILQ_NEXT(*r, entries);
3584 return;
3585 } else if (*depth == 0 && a != NULL)
3586 *a = *r;
3587 f = stack + (*depth)++;
3588 f->rs = *rs;
3589 f->r = *r;
3590 if ((*r)->anchor_wildcard) {
3591 struct pf_kanchor_node *parent = &(*r)->anchor->children;
3592
3593 if ((f->child = RB_MIN(pf_kanchor_node, parent)) == NULL) {
3594 *r = NULL;
3595 return;
3596 }
3597 *rs = &f->child->ruleset;
3598 } else {
3599 f->child = NULL;
3600 *rs = &(*r)->anchor->ruleset;
3601 }
3602 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
3603 }
3604
3605 int
pf_step_out_of_anchor(struct pf_kanchor_stackframe * stack,int * depth,struct pf_kruleset ** rs,int n,struct pf_krule ** r,struct pf_krule ** a,int * match)3606 pf_step_out_of_anchor(struct pf_kanchor_stackframe *stack, int *depth,
3607 struct pf_kruleset **rs, int n, struct pf_krule **r, struct pf_krule **a,
3608 int *match)
3609 {
3610 struct pf_kanchor_stackframe *f;
3611 struct pf_krule *fr;
3612 int quick = 0;
3613
3614 PF_RULES_RASSERT();
3615
3616 do {
3617 if (*depth <= 0)
3618 break;
3619 f = stack + *depth - 1;
3620 fr = PF_ANCHOR_RULE(f);
3621 if (f->child != NULL) {
3622 /*
3623 * This block traverses through
3624 * a wildcard anchor.
3625 */
3626 if (match != NULL && *match) {
3627 /*
3628 * If any of "*" matched, then
3629 * "foo/ *" matched, mark frame
3630 * appropriately.
3631 */
3632 PF_ANCHOR_SET_MATCH(f);
3633 *match = 0;
3634 }
3635 f->child = RB_NEXT(pf_kanchor_node,
3636 &fr->anchor->children, f->child);
3637 if (f->child != NULL) {
3638 *rs = &f->child->ruleset;
3639 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
3640 if (*r == NULL)
3641 continue;
3642 else
3643 break;
3644 }
3645 }
3646 (*depth)--;
3647 if (*depth == 0 && a != NULL)
3648 *a = NULL;
3649 *rs = f->rs;
3650 if (PF_ANCHOR_MATCH(f) || (match != NULL && *match))
3651 quick = fr->quick;
3652 *r = TAILQ_NEXT(fr, entries);
3653 } while (*r == NULL);
3654
3655 return (quick);
3656 }
3657
3658 struct pf_keth_anchor_stackframe {
3659 struct pf_keth_ruleset *rs;
3660 struct pf_keth_rule *r; /* XXX: + match bit */
3661 struct pf_keth_anchor *child;
3662 };
3663
3664 #define PF_ETH_ANCHOR_MATCH(f) ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH)
3665 #define PF_ETH_ANCHOR_RULE(f) (struct pf_keth_rule *) \
3666 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK)
3667 #define PF_ETH_ANCHOR_SET_MATCH(f) do { (f)->r = (void *) \
3668 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH); \
3669 } while (0)
3670
3671 void
pf_step_into_keth_anchor(struct pf_keth_anchor_stackframe * stack,int * depth,struct pf_keth_ruleset ** rs,struct pf_keth_rule ** r,struct pf_keth_rule ** a,int * match)3672 pf_step_into_keth_anchor(struct pf_keth_anchor_stackframe *stack, int *depth,
3673 struct pf_keth_ruleset **rs, struct pf_keth_rule **r,
3674 struct pf_keth_rule **a, int *match)
3675 {
3676 struct pf_keth_anchor_stackframe *f;
3677
3678 NET_EPOCH_ASSERT();
3679
3680 if (match)
3681 *match = 0;
3682 if (*depth >= PF_ANCHOR_STACKSIZE) {
3683 printf("%s: anchor stack overflow on %s\n",
3684 __func__, (*r)->anchor->name);
3685 *r = TAILQ_NEXT(*r, entries);
3686 return;
3687 } else if (*depth == 0 && a != NULL)
3688 *a = *r;
3689 f = stack + (*depth)++;
3690 f->rs = *rs;
3691 f->r = *r;
3692 if ((*r)->anchor_wildcard) {
3693 struct pf_keth_anchor_node *parent = &(*r)->anchor->children;
3694
3695 if ((f->child = RB_MIN(pf_keth_anchor_node, parent)) == NULL) {
3696 *r = NULL;
3697 return;
3698 }
3699 *rs = &f->child->ruleset;
3700 } else {
3701 f->child = NULL;
3702 *rs = &(*r)->anchor->ruleset;
3703 }
3704 *r = TAILQ_FIRST((*rs)->active.rules);
3705 }
3706
3707 int
pf_step_out_of_keth_anchor(struct pf_keth_anchor_stackframe * stack,int * depth,struct pf_keth_ruleset ** rs,struct pf_keth_rule ** r,struct pf_keth_rule ** a,int * match)3708 pf_step_out_of_keth_anchor(struct pf_keth_anchor_stackframe *stack, int *depth,
3709 struct pf_keth_ruleset **rs, struct pf_keth_rule **r,
3710 struct pf_keth_rule **a, int *match)
3711 {
3712 struct pf_keth_anchor_stackframe *f;
3713 struct pf_keth_rule *fr;
3714 int quick = 0;
3715
3716 NET_EPOCH_ASSERT();
3717
3718 do {
3719 if (*depth <= 0)
3720 break;
3721 f = stack + *depth - 1;
3722 fr = PF_ETH_ANCHOR_RULE(f);
3723 if (f->child != NULL) {
3724 /*
3725 * This block traverses through
3726 * a wildcard anchor.
3727 */
3728 if (match != NULL && *match) {
3729 /*
3730 * If any of "*" matched, then
3731 * "foo/ *" matched, mark frame
3732 * appropriately.
3733 */
3734 PF_ETH_ANCHOR_SET_MATCH(f);
3735 *match = 0;
3736 }
3737 f->child = RB_NEXT(pf_keth_anchor_node,
3738 &fr->anchor->children, f->child);
3739 if (f->child != NULL) {
3740 *rs = &f->child->ruleset;
3741 *r = TAILQ_FIRST((*rs)->active.rules);
3742 if (*r == NULL)
3743 continue;
3744 else
3745 break;
3746 }
3747 }
3748 (*depth)--;
3749 if (*depth == 0 && a != NULL)
3750 *a = NULL;
3751 *rs = f->rs;
3752 if (PF_ETH_ANCHOR_MATCH(f) || (match != NULL && *match))
3753 quick = fr->quick;
3754 *r = TAILQ_NEXT(fr, entries);
3755 } while (*r == NULL);
3756
3757 return (quick);
3758 }
3759
3760 #ifdef INET6
3761 void
pf_poolmask(struct pf_addr * naddr,struct pf_addr * raddr,struct pf_addr * rmask,struct pf_addr * saddr,sa_family_t af)3762 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
3763 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
3764 {
3765 switch (af) {
3766 #ifdef INET
3767 case AF_INET:
3768 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
3769 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
3770 break;
3771 #endif /* INET */
3772 case AF_INET6:
3773 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
3774 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
3775 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
3776 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
3777 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
3778 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
3779 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
3780 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
3781 break;
3782 }
3783 }
3784
3785 void
pf_addr_inc(struct pf_addr * addr,sa_family_t af)3786 pf_addr_inc(struct pf_addr *addr, sa_family_t af)
3787 {
3788 switch (af) {
3789 #ifdef INET
3790 case AF_INET:
3791 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
3792 break;
3793 #endif /* INET */
3794 case AF_INET6:
3795 if (addr->addr32[3] == 0xffffffff) {
3796 addr->addr32[3] = 0;
3797 if (addr->addr32[2] == 0xffffffff) {
3798 addr->addr32[2] = 0;
3799 if (addr->addr32[1] == 0xffffffff) {
3800 addr->addr32[1] = 0;
3801 addr->addr32[0] =
3802 htonl(ntohl(addr->addr32[0]) + 1);
3803 } else
3804 addr->addr32[1] =
3805 htonl(ntohl(addr->addr32[1]) + 1);
3806 } else
3807 addr->addr32[2] =
3808 htonl(ntohl(addr->addr32[2]) + 1);
3809 } else
3810 addr->addr32[3] =
3811 htonl(ntohl(addr->addr32[3]) + 1);
3812 break;
3813 }
3814 }
3815 #endif /* INET6 */
3816
3817 void
pf_rule_to_actions(struct pf_krule * r,struct pf_rule_actions * a)3818 pf_rule_to_actions(struct pf_krule *r, struct pf_rule_actions *a)
3819 {
3820 /*
3821 * Modern rules use the same flags in rules as they do in states.
3822 */
3823 a->flags |= (r->scrub_flags & (PFSTATE_NODF|PFSTATE_RANDOMID|
3824 PFSTATE_SCRUB_TCP|PFSTATE_SETPRIO));
3825
3826 /*
3827 * Old-style scrub rules have different flags which need to be translated.
3828 */
3829 if (r->rule_flag & PFRULE_RANDOMID)
3830 a->flags |= PFSTATE_RANDOMID;
3831 if (r->scrub_flags & PFSTATE_SETTOS || r->rule_flag & PFRULE_SET_TOS ) {
3832 a->flags |= PFSTATE_SETTOS;
3833 a->set_tos = r->set_tos;
3834 }
3835
3836 if (r->qid)
3837 a->qid = r->qid;
3838 if (r->pqid)
3839 a->pqid = r->pqid;
3840 if (r->rtableid >= 0)
3841 a->rtableid = r->rtableid;
3842 a->log |= r->log;
3843 if (r->min_ttl)
3844 a->min_ttl = r->min_ttl;
3845 if (r->max_mss)
3846 a->max_mss = r->max_mss;
3847 if (r->dnpipe)
3848 a->dnpipe = r->dnpipe;
3849 if (r->dnrpipe)
3850 a->dnrpipe = r->dnrpipe;
3851 if (r->dnpipe || r->dnrpipe) {
3852 if (r->free_flags & PFRULE_DN_IS_PIPE)
3853 a->flags |= PFSTATE_DN_IS_PIPE;
3854 else
3855 a->flags &= ~PFSTATE_DN_IS_PIPE;
3856 }
3857 if (r->scrub_flags & PFSTATE_SETPRIO) {
3858 a->set_prio[0] = r->set_prio[0];
3859 a->set_prio[1] = r->set_prio[1];
3860 }
3861 }
3862
3863 int
pf_socket_lookup(struct pf_pdesc * pd,struct mbuf * m)3864 pf_socket_lookup(struct pf_pdesc *pd, struct mbuf *m)
3865 {
3866 struct pf_addr *saddr, *daddr;
3867 u_int16_t sport, dport;
3868 struct inpcbinfo *pi;
3869 struct inpcb *inp;
3870
3871 pd->lookup.uid = UID_MAX;
3872 pd->lookup.gid = GID_MAX;
3873
3874 switch (pd->proto) {
3875 case IPPROTO_TCP:
3876 sport = pd->hdr.tcp.th_sport;
3877 dport = pd->hdr.tcp.th_dport;
3878 pi = &V_tcbinfo;
3879 break;
3880 case IPPROTO_UDP:
3881 sport = pd->hdr.udp.uh_sport;
3882 dport = pd->hdr.udp.uh_dport;
3883 pi = &V_udbinfo;
3884 break;
3885 default:
3886 return (-1);
3887 }
3888 if (pd->dir == PF_IN) {
3889 saddr = pd->src;
3890 daddr = pd->dst;
3891 } else {
3892 u_int16_t p;
3893
3894 p = sport;
3895 sport = dport;
3896 dport = p;
3897 saddr = pd->dst;
3898 daddr = pd->src;
3899 }
3900 switch (pd->af) {
3901 #ifdef INET
3902 case AF_INET:
3903 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4,
3904 dport, INPLOOKUP_RLOCKPCB, NULL, m);
3905 if (inp == NULL) {
3906 inp = in_pcblookup_mbuf(pi, saddr->v4, sport,
3907 daddr->v4, dport, INPLOOKUP_WILDCARD |
3908 INPLOOKUP_RLOCKPCB, NULL, m);
3909 if (inp == NULL)
3910 return (-1);
3911 }
3912 break;
3913 #endif /* INET */
3914 #ifdef INET6
3915 case AF_INET6:
3916 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6,
3917 dport, INPLOOKUP_RLOCKPCB, NULL, m);
3918 if (inp == NULL) {
3919 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport,
3920 &daddr->v6, dport, INPLOOKUP_WILDCARD |
3921 INPLOOKUP_RLOCKPCB, NULL, m);
3922 if (inp == NULL)
3923 return (-1);
3924 }
3925 break;
3926 #endif /* INET6 */
3927
3928 default:
3929 return (-1);
3930 }
3931 INP_RLOCK_ASSERT(inp);
3932 pd->lookup.uid = inp->inp_cred->cr_uid;
3933 pd->lookup.gid = inp->inp_cred->cr_groups[0];
3934 INP_RUNLOCK(inp);
3935
3936 return (1);
3937 }
3938
3939 u_int8_t
pf_get_wscale(struct mbuf * m,int off,u_int16_t th_off,sa_family_t af)3940 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
3941 {
3942 int hlen;
3943 u_int8_t hdr[60];
3944 u_int8_t *opt, optlen;
3945 u_int8_t wscale = 0;
3946
3947 hlen = th_off << 2; /* hlen <= sizeof(hdr) */
3948 if (hlen <= sizeof(struct tcphdr))
3949 return (0);
3950 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
3951 return (0);
3952 opt = hdr + sizeof(struct tcphdr);
3953 hlen -= sizeof(struct tcphdr);
3954 while (hlen >= 3) {
3955 switch (*opt) {
3956 case TCPOPT_EOL:
3957 case TCPOPT_NOP:
3958 ++opt;
3959 --hlen;
3960 break;
3961 case TCPOPT_WINDOW:
3962 wscale = opt[2];
3963 if (wscale > TCP_MAX_WINSHIFT)
3964 wscale = TCP_MAX_WINSHIFT;
3965 wscale |= PF_WSCALE_FLAG;
3966 /* FALLTHROUGH */
3967 default:
3968 optlen = opt[1];
3969 if (optlen < 2)
3970 optlen = 2;
3971 hlen -= optlen;
3972 opt += optlen;
3973 break;
3974 }
3975 }
3976 return (wscale);
3977 }
3978
3979 u_int16_t
pf_get_mss(struct mbuf * m,int off,u_int16_t th_off,sa_family_t af)3980 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
3981 {
3982 int hlen;
3983 u_int8_t hdr[60];
3984 u_int8_t *opt, optlen;
3985 u_int16_t mss = V_tcp_mssdflt;
3986
3987 hlen = th_off << 2; /* hlen <= sizeof(hdr) */
3988 if (hlen <= sizeof(struct tcphdr))
3989 return (0);
3990 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
3991 return (0);
3992 opt = hdr + sizeof(struct tcphdr);
3993 hlen -= sizeof(struct tcphdr);
3994 while (hlen >= TCPOLEN_MAXSEG) {
3995 switch (*opt) {
3996 case TCPOPT_EOL:
3997 case TCPOPT_NOP:
3998 ++opt;
3999 --hlen;
4000 break;
4001 case TCPOPT_MAXSEG:
4002 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
4003 NTOHS(mss);
4004 /* FALLTHROUGH */
4005 default:
4006 optlen = opt[1];
4007 if (optlen < 2)
4008 optlen = 2;
4009 hlen -= optlen;
4010 opt += optlen;
4011 break;
4012 }
4013 }
4014 return (mss);
4015 }
4016
4017 static u_int16_t
pf_calc_mss(struct pf_addr * addr,sa_family_t af,int rtableid,u_int16_t offer)4018 pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer)
4019 {
4020 struct nhop_object *nh;
4021 #ifdef INET6
4022 struct in6_addr dst6;
4023 uint32_t scopeid;
4024 #endif /* INET6 */
4025 int hlen = 0;
4026 uint16_t mss = 0;
4027
4028 NET_EPOCH_ASSERT();
4029
4030 switch (af) {
4031 #ifdef INET
4032 case AF_INET:
4033 hlen = sizeof(struct ip);
4034 nh = fib4_lookup(rtableid, addr->v4, 0, 0, 0);
4035 if (nh != NULL)
4036 mss = nh->nh_mtu - hlen - sizeof(struct tcphdr);
4037 break;
4038 #endif /* INET */
4039 #ifdef INET6
4040 case AF_INET6:
4041 hlen = sizeof(struct ip6_hdr);
4042 in6_splitscope(&addr->v6, &dst6, &scopeid);
4043 nh = fib6_lookup(rtableid, &dst6, scopeid, 0, 0);
4044 if (nh != NULL)
4045 mss = nh->nh_mtu - hlen - sizeof(struct tcphdr);
4046 break;
4047 #endif /* INET6 */
4048 }
4049
4050 mss = max(V_tcp_mssdflt, mss);
4051 mss = min(mss, offer);
4052 mss = max(mss, 64); /* sanity - at least max opt space */
4053 return (mss);
4054 }
4055
4056 static u_int32_t
pf_tcp_iss(struct pf_pdesc * pd)4057 pf_tcp_iss(struct pf_pdesc *pd)
4058 {
4059 MD5_CTX ctx;
4060 u_int32_t digest[4];
4061
4062 if (V_pf_tcp_secret_init == 0) {
4063 arc4random_buf(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret));
4064 MD5Init(&V_pf_tcp_secret_ctx);
4065 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret,
4066 sizeof(V_pf_tcp_secret));
4067 V_pf_tcp_secret_init = 1;
4068 }
4069
4070 ctx = V_pf_tcp_secret_ctx;
4071
4072 MD5Update(&ctx, (char *)&pd->hdr.tcp.th_sport, sizeof(u_short));
4073 MD5Update(&ctx, (char *)&pd->hdr.tcp.th_dport, sizeof(u_short));
4074 if (pd->af == AF_INET6) {
4075 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr));
4076 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr));
4077 } else {
4078 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr));
4079 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr));
4080 }
4081 MD5Final((u_char *)digest, &ctx);
4082 V_pf_tcp_iss_off += 4096;
4083 #define ISN_RANDOM_INCREMENT (4096 - 1)
4084 return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) +
4085 V_pf_tcp_iss_off);
4086 #undef ISN_RANDOM_INCREMENT
4087 }
4088
4089 static bool
pf_match_eth_addr(const uint8_t * a,const struct pf_keth_rule_addr * r)4090 pf_match_eth_addr(const uint8_t *a, const struct pf_keth_rule_addr *r)
4091 {
4092 bool match = true;
4093
4094 /* Always matches if not set */
4095 if (! r->isset)
4096 return (!r->neg);
4097
4098 for (int i = 0; i < ETHER_ADDR_LEN; i++) {
4099 if ((a[i] & r->mask[i]) != (r->addr[i] & r->mask[i])) {
4100 match = false;
4101 break;
4102 }
4103 }
4104
4105 return (match ^ r->neg);
4106 }
4107
4108 static int
pf_match_eth_tag(struct mbuf * m,struct pf_keth_rule * r,int * tag,int mtag)4109 pf_match_eth_tag(struct mbuf *m, struct pf_keth_rule *r, int *tag, int mtag)
4110 {
4111 if (*tag == -1)
4112 *tag = mtag;
4113
4114 return ((!r->match_tag_not && r->match_tag == *tag) ||
4115 (r->match_tag_not && r->match_tag != *tag));
4116 }
4117
4118 static void
pf_bridge_to(struct ifnet * ifp,struct mbuf * m)4119 pf_bridge_to(struct ifnet *ifp, struct mbuf *m)
4120 {
4121 /* If we don't have the interface drop the packet. */
4122 if (ifp == NULL) {
4123 m_freem(m);
4124 return;
4125 }
4126
4127 switch (ifp->if_type) {
4128 case IFT_ETHER:
4129 case IFT_XETHER:
4130 case IFT_L2VLAN:
4131 case IFT_BRIDGE:
4132 case IFT_IEEE8023ADLAG:
4133 break;
4134 default:
4135 m_freem(m);
4136 return;
4137 }
4138
4139 ifp->if_transmit(ifp, m);
4140 }
4141
4142 static int
pf_test_eth_rule(int dir,struct pfi_kkif * kif,struct mbuf ** m0)4143 pf_test_eth_rule(int dir, struct pfi_kkif *kif, struct mbuf **m0)
4144 {
4145 #ifdef INET
4146 struct ip ip;
4147 #endif
4148 #ifdef INET6
4149 struct ip6_hdr ip6;
4150 #endif
4151 struct mbuf *m = *m0;
4152 struct ether_header *e;
4153 struct pf_keth_rule *r, *rm, *a = NULL;
4154 struct pf_keth_ruleset *ruleset = NULL;
4155 struct pf_mtag *mtag;
4156 struct pf_keth_ruleq *rules;
4157 struct pf_addr *src = NULL, *dst = NULL;
4158 struct pfi_kkif *bridge_to;
4159 sa_family_t af = 0;
4160 uint16_t proto;
4161 int asd = 0, match = 0;
4162 int tag = -1;
4163 uint8_t action;
4164 struct pf_keth_anchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE];
4165
4166 MPASS(kif->pfik_ifp->if_vnet == curvnet);
4167 NET_EPOCH_ASSERT();
4168
4169 PF_RULES_RLOCK_TRACKER;
4170
4171 SDT_PROBE3(pf, eth, test_rule, entry, dir, kif->pfik_ifp, m);
4172
4173 mtag = pf_find_mtag(m);
4174 if (mtag != NULL && mtag->flags & PF_MTAG_FLAG_DUMMYNET) {
4175 /* Dummynet re-injects packets after they've
4176 * completed their delay. We've already
4177 * processed them, so pass unconditionally. */
4178
4179 /* But only once. We may see the packet multiple times (e.g.
4180 * PFIL_IN/PFIL_OUT). */
4181 pf_dummynet_flag_remove(m, mtag);
4182
4183 return (PF_PASS);
4184 }
4185
4186 ruleset = V_pf_keth;
4187 rules = ck_pr_load_ptr(&ruleset->active.rules);
4188 r = TAILQ_FIRST(rules);
4189 rm = NULL;
4190
4191 e = mtod(m, struct ether_header *);
4192 proto = ntohs(e->ether_type);
4193
4194 switch (proto) {
4195 #ifdef INET
4196 case ETHERTYPE_IP: {
4197 if (m_length(m, NULL) < (sizeof(struct ether_header) +
4198 sizeof(ip)))
4199 return (PF_DROP);
4200
4201 af = AF_INET;
4202 m_copydata(m, sizeof(struct ether_header), sizeof(ip),
4203 (caddr_t)&ip);
4204 src = (struct pf_addr *)&ip.ip_src;
4205 dst = (struct pf_addr *)&ip.ip_dst;
4206 break;
4207 }
4208 #endif /* INET */
4209 #ifdef INET6
4210 case ETHERTYPE_IPV6: {
4211 if (m_length(m, NULL) < (sizeof(struct ether_header) +
4212 sizeof(ip6)))
4213 return (PF_DROP);
4214
4215 af = AF_INET6;
4216 m_copydata(m, sizeof(struct ether_header), sizeof(ip6),
4217 (caddr_t)&ip6);
4218 src = (struct pf_addr *)&ip6.ip6_src;
4219 dst = (struct pf_addr *)&ip6.ip6_dst;
4220 break;
4221 }
4222 #endif /* INET6 */
4223 }
4224
4225 PF_RULES_RLOCK();
4226
4227 while (r != NULL) {
4228 counter_u64_add(r->evaluations, 1);
4229 SDT_PROBE2(pf, eth, test_rule, test, r->nr, r);
4230
4231 if (pfi_kkif_match(r->kif, kif) == r->ifnot) {
4232 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r,
4233 "kif");
4234 r = r->skip[PFE_SKIP_IFP].ptr;
4235 }
4236 else if (r->direction && r->direction != dir) {
4237 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r,
4238 "dir");
4239 r = r->skip[PFE_SKIP_DIR].ptr;
4240 }
4241 else if (r->proto && r->proto != proto) {
4242 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r,
4243 "proto");
4244 r = r->skip[PFE_SKIP_PROTO].ptr;
4245 }
4246 else if (! pf_match_eth_addr(e->ether_shost, &r->src)) {
4247 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r,
4248 "src");
4249 r = r->skip[PFE_SKIP_SRC_ADDR].ptr;
4250 }
4251 else if (! pf_match_eth_addr(e->ether_dhost, &r->dst)) {
4252 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r,
4253 "dst");
4254 r = r->skip[PFE_SKIP_DST_ADDR].ptr;
4255 }
4256 else if (src != NULL && PF_MISMATCHAW(&r->ipsrc.addr, src, af,
4257 r->ipsrc.neg, kif, M_GETFIB(m))) {
4258 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r,
4259 "ip_src");
4260 r = r->skip[PFE_SKIP_SRC_IP_ADDR].ptr;
4261 }
4262 else if (dst != NULL && PF_MISMATCHAW(&r->ipdst.addr, dst, af,
4263 r->ipdst.neg, kif, M_GETFIB(m))) {
4264 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r,
4265 "ip_dst");
4266 r = r->skip[PFE_SKIP_DST_IP_ADDR].ptr;
4267 }
4268 else if (r->match_tag && !pf_match_eth_tag(m, r, &tag,
4269 mtag ? mtag->tag : 0)) {
4270 SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r,
4271 "match_tag");
4272 r = TAILQ_NEXT(r, entries);
4273 }
4274 else {
4275 if (r->tag)
4276 tag = r->tag;
4277 if (r->anchor == NULL) {
4278 /* Rule matches */
4279 rm = r;
4280
4281 SDT_PROBE2(pf, eth, test_rule, match, r->nr, r);
4282
4283 if (r->quick)
4284 break;
4285
4286 r = TAILQ_NEXT(r, entries);
4287 } else {
4288 pf_step_into_keth_anchor(anchor_stack, &asd,
4289 &ruleset, &r, &a, &match);
4290 }
4291 }
4292 if (r == NULL && pf_step_out_of_keth_anchor(anchor_stack, &asd,
4293 &ruleset, &r, &a, &match))
4294 break;
4295 }
4296
4297 r = rm;
4298
4299 SDT_PROBE2(pf, eth, test_rule, final_match, (r != NULL ? r->nr : -1), r);
4300
4301 /* Default to pass. */
4302 if (r == NULL) {
4303 PF_RULES_RUNLOCK();
4304 return (PF_PASS);
4305 }
4306
4307 /* Execute action. */
4308 counter_u64_add(r->packets[dir == PF_OUT], 1);
4309 counter_u64_add(r->bytes[dir == PF_OUT], m_length(m, NULL));
4310 pf_update_timestamp(r);
4311
4312 /* Shortcut. Don't tag if we're just going to drop anyway. */
4313 if (r->action == PF_DROP) {
4314 PF_RULES_RUNLOCK();
4315 return (PF_DROP);
4316 }
4317
4318 if (tag > 0) {
4319 if (mtag == NULL)
4320 mtag = pf_get_mtag(m);
4321 if (mtag == NULL) {
4322 PF_RULES_RUNLOCK();
4323 counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1);
4324 return (PF_DROP);
4325 }
4326 mtag->tag = tag;
4327 }
4328
4329 if (r->qid != 0) {
4330 if (mtag == NULL)
4331 mtag = pf_get_mtag(m);
4332 if (mtag == NULL) {
4333 PF_RULES_RUNLOCK();
4334 counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1);
4335 return (PF_DROP);
4336 }
4337 mtag->qid = r->qid;
4338 }
4339
4340 action = r->action;
4341 bridge_to = r->bridge_to;
4342
4343 /* Dummynet */
4344 if (r->dnpipe) {
4345 struct ip_fw_args dnflow;
4346
4347 /* Drop packet if dummynet is not loaded. */
4348 if (ip_dn_io_ptr == NULL) {
4349 PF_RULES_RUNLOCK();
4350 m_freem(m);
4351 counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1);
4352 return (PF_DROP);
4353 }
4354 if (mtag == NULL)
4355 mtag = pf_get_mtag(m);
4356 if (mtag == NULL) {
4357 PF_RULES_RUNLOCK();
4358 counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1);
4359 return (PF_DROP);
4360 }
4361
4362 bzero(&dnflow, sizeof(dnflow));
4363
4364 /* We don't have port numbers here, so we set 0. That means
4365 * that we'll be somewhat limited in distinguishing flows (i.e.
4366 * only based on IP addresses, not based on port numbers), but
4367 * it's better than nothing. */
4368 dnflow.f_id.dst_port = 0;
4369 dnflow.f_id.src_port = 0;
4370 dnflow.f_id.proto = 0;
4371
4372 dnflow.rule.info = r->dnpipe;
4373 dnflow.rule.info |= IPFW_IS_DUMMYNET;
4374 if (r->dnflags & PFRULE_DN_IS_PIPE)
4375 dnflow.rule.info |= IPFW_IS_PIPE;
4376
4377 dnflow.f_id.extra = dnflow.rule.info;
4378
4379 dnflow.flags = dir == PF_IN ? IPFW_ARGS_IN : IPFW_ARGS_OUT;
4380 dnflow.flags |= IPFW_ARGS_ETHER;
4381 dnflow.ifp = kif->pfik_ifp;
4382
4383 switch (af) {
4384 case AF_INET:
4385 dnflow.f_id.addr_type = 4;
4386 dnflow.f_id.src_ip = src->v4.s_addr;
4387 dnflow.f_id.dst_ip = dst->v4.s_addr;
4388 break;
4389 case AF_INET6:
4390 dnflow.flags |= IPFW_ARGS_IP6;
4391 dnflow.f_id.addr_type = 6;
4392 dnflow.f_id.src_ip6 = src->v6;
4393 dnflow.f_id.dst_ip6 = dst->v6;
4394 break;
4395 }
4396
4397 PF_RULES_RUNLOCK();
4398
4399 mtag->flags |= PF_MTAG_FLAG_DUMMYNET;
4400 ip_dn_io_ptr(m0, &dnflow);
4401 if (*m0 != NULL)
4402 pf_dummynet_flag_remove(m, mtag);
4403 } else {
4404 PF_RULES_RUNLOCK();
4405 }
4406
4407 if (action == PF_PASS && bridge_to) {
4408 pf_bridge_to(bridge_to->pfik_ifp, *m0);
4409 *m0 = NULL; /* We've eaten the packet. */
4410 }
4411
4412 return (action);
4413 }
4414
4415 static int
pf_test_rule(struct pf_krule ** rm,struct pf_kstate ** sm,struct pfi_kkif * kif,struct mbuf * m,int off,struct pf_pdesc * pd,struct pf_krule ** am,struct pf_kruleset ** rsm,struct inpcb * inp)4416 pf_test_rule(struct pf_krule **rm, struct pf_kstate **sm, struct pfi_kkif *kif,
4417 struct mbuf *m, int off, struct pf_pdesc *pd, struct pf_krule **am,
4418 struct pf_kruleset **rsm, struct inpcb *inp)
4419 {
4420 struct pf_krule *nr = NULL;
4421 struct pf_addr * const saddr = pd->src;
4422 struct pf_addr * const daddr = pd->dst;
4423 sa_family_t af = pd->af;
4424 struct pf_krule *r, *a = NULL;
4425 struct pf_kruleset *ruleset = NULL;
4426 struct pf_krule_slist match_rules;
4427 struct pf_krule_item *ri;
4428 struct pf_ksrc_node *nsn = NULL;
4429 struct tcphdr *th = &pd->hdr.tcp;
4430 struct pf_state_key *sk = NULL, *nk = NULL;
4431 u_short reason;
4432 int rewrite = 0, hdrlen = 0;
4433 int tag = -1;
4434 int asd = 0;
4435 int match = 0;
4436 int state_icmp = 0;
4437 u_int16_t sport = 0, dport = 0;
4438 u_int16_t bproto_sum = 0, bip_sum = 0;
4439 u_int8_t icmptype = 0, icmpcode = 0;
4440 struct pf_kanchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE];
4441
4442 PF_RULES_RASSERT();
4443
4444 if (inp != NULL) {
4445 INP_LOCK_ASSERT(inp);
4446 pd->lookup.uid = inp->inp_cred->cr_uid;
4447 pd->lookup.gid = inp->inp_cred->cr_groups[0];
4448 pd->lookup.done = 1;
4449 }
4450
4451 switch (pd->proto) {
4452 case IPPROTO_TCP:
4453 sport = th->th_sport;
4454 dport = th->th_dport;
4455 hdrlen = sizeof(*th);
4456 break;
4457 case IPPROTO_UDP:
4458 sport = pd->hdr.udp.uh_sport;
4459 dport = pd->hdr.udp.uh_dport;
4460 hdrlen = sizeof(pd->hdr.udp);
4461 break;
4462 case IPPROTO_SCTP:
4463 sport = pd->hdr.sctp.src_port;
4464 dport = pd->hdr.sctp.dest_port;
4465 hdrlen = sizeof(pd->hdr.sctp);
4466 break;
4467 #ifdef INET
4468 case IPPROTO_ICMP:
4469 if (pd->af != AF_INET)
4470 break;
4471 sport = dport = pd->hdr.icmp.icmp_id;
4472 hdrlen = sizeof(pd->hdr.icmp);
4473 icmptype = pd->hdr.icmp.icmp_type;
4474 icmpcode = pd->hdr.icmp.icmp_code;
4475
4476 if (icmptype == ICMP_UNREACH ||
4477 icmptype == ICMP_SOURCEQUENCH ||
4478 icmptype == ICMP_REDIRECT ||
4479 icmptype == ICMP_TIMXCEED ||
4480 icmptype == ICMP_PARAMPROB)
4481 state_icmp++;
4482 break;
4483 #endif /* INET */
4484 #ifdef INET6
4485 case IPPROTO_ICMPV6:
4486 if (af != AF_INET6)
4487 break;
4488 sport = dport = pd->hdr.icmp6.icmp6_id;
4489 hdrlen = sizeof(pd->hdr.icmp6);
4490 icmptype = pd->hdr.icmp6.icmp6_type;
4491 icmpcode = pd->hdr.icmp6.icmp6_code;
4492
4493 if (icmptype == ICMP6_DST_UNREACH ||
4494 icmptype == ICMP6_PACKET_TOO_BIG ||
4495 icmptype == ICMP6_TIME_EXCEEDED ||
4496 icmptype == ICMP6_PARAM_PROB)
4497 state_icmp++;
4498 break;
4499 #endif /* INET6 */
4500 default:
4501 sport = dport = hdrlen = 0;
4502 break;
4503 }
4504
4505 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
4506
4507 /* check packet for BINAT/NAT/RDR */
4508 if ((nr = pf_get_translation(pd, m, off, kif, &nsn, &sk,
4509 &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) {
4510 KASSERT(sk != NULL, ("%s: null sk", __func__));
4511 KASSERT(nk != NULL, ("%s: null nk", __func__));
4512
4513 if (nr->log) {
4514 PFLOG_PACKET(kif, m, af, PF_PASS, PFRES_MATCH, nr, a,
4515 ruleset, pd, 1);
4516 }
4517
4518 if (pd->ip_sum)
4519 bip_sum = *pd->ip_sum;
4520
4521 switch (pd->proto) {
4522 case IPPROTO_TCP:
4523 bproto_sum = th->th_sum;
4524 pd->proto_sum = &th->th_sum;
4525
4526 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
4527 nk->port[pd->sidx] != sport) {
4528 pf_change_ap(m, saddr, &th->th_sport, pd->ip_sum,
4529 &th->th_sum, &nk->addr[pd->sidx],
4530 nk->port[pd->sidx], 0, af);
4531 pd->sport = &th->th_sport;
4532 sport = th->th_sport;
4533 }
4534
4535 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
4536 nk->port[pd->didx] != dport) {
4537 pf_change_ap(m, daddr, &th->th_dport, pd->ip_sum,
4538 &th->th_sum, &nk->addr[pd->didx],
4539 nk->port[pd->didx], 0, af);
4540 dport = th->th_dport;
4541 pd->dport = &th->th_dport;
4542 }
4543 rewrite++;
4544 break;
4545 case IPPROTO_UDP:
4546 bproto_sum = pd->hdr.udp.uh_sum;
4547 pd->proto_sum = &pd->hdr.udp.uh_sum;
4548
4549 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
4550 nk->port[pd->sidx] != sport) {
4551 pf_change_ap(m, saddr, &pd->hdr.udp.uh_sport,
4552 pd->ip_sum, &pd->hdr.udp.uh_sum,
4553 &nk->addr[pd->sidx],
4554 nk->port[pd->sidx], 1, af);
4555 sport = pd->hdr.udp.uh_sport;
4556 pd->sport = &pd->hdr.udp.uh_sport;
4557 }
4558
4559 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
4560 nk->port[pd->didx] != dport) {
4561 pf_change_ap(m, daddr, &pd->hdr.udp.uh_dport,
4562 pd->ip_sum, &pd->hdr.udp.uh_sum,
4563 &nk->addr[pd->didx],
4564 nk->port[pd->didx], 1, af);
4565 dport = pd->hdr.udp.uh_dport;
4566 pd->dport = &pd->hdr.udp.uh_dport;
4567 }
4568 rewrite++;
4569 break;
4570 case IPPROTO_SCTP: {
4571 uint16_t checksum = 0;
4572
4573 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
4574 nk->port[pd->sidx] != sport) {
4575 pf_change_ap(m, saddr, &pd->hdr.sctp.src_port,
4576 pd->ip_sum, &checksum,
4577 &nk->addr[pd->sidx],
4578 nk->port[pd->sidx], 1, af);
4579 }
4580 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
4581 nk->port[pd->didx] != dport) {
4582 pf_change_ap(m, daddr, &pd->hdr.sctp.dest_port,
4583 pd->ip_sum, &checksum,
4584 &nk->addr[pd->didx],
4585 nk->port[pd->didx], 1, af);
4586 }
4587 break;
4588 }
4589 #ifdef INET
4590 case IPPROTO_ICMP:
4591 nk->port[0] = nk->port[1];
4592 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET))
4593 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
4594 nk->addr[pd->sidx].v4.s_addr, 0);
4595
4596 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET))
4597 pf_change_a(&daddr->v4.s_addr, pd->ip_sum,
4598 nk->addr[pd->didx].v4.s_addr, 0);
4599
4600 if (nk->port[1] != pd->hdr.icmp.icmp_id) {
4601 pd->hdr.icmp.icmp_cksum = pf_cksum_fixup(
4602 pd->hdr.icmp.icmp_cksum, sport,
4603 nk->port[1], 0);
4604 pd->hdr.icmp.icmp_id = nk->port[1];
4605 pd->sport = &pd->hdr.icmp.icmp_id;
4606 }
4607 m_copyback(m, off, ICMP_MINLEN, (caddr_t)&pd->hdr.icmp);
4608 break;
4609 #endif /* INET */
4610 #ifdef INET6
4611 case IPPROTO_ICMPV6:
4612 nk->port[0] = nk->port[1];
4613 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6))
4614 pf_change_a6(saddr, &pd->hdr.icmp6.icmp6_cksum,
4615 &nk->addr[pd->sidx], 0);
4616
4617 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6))
4618 pf_change_a6(daddr, &pd->hdr.icmp6.icmp6_cksum,
4619 &nk->addr[pd->didx], 0);
4620 rewrite++;
4621 break;
4622 #endif /* INET */
4623 default:
4624 switch (af) {
4625 #ifdef INET
4626 case AF_INET:
4627 if (PF_ANEQ(saddr,
4628 &nk->addr[pd->sidx], AF_INET))
4629 pf_change_a(&saddr->v4.s_addr,
4630 pd->ip_sum,
4631 nk->addr[pd->sidx].v4.s_addr, 0);
4632
4633 if (PF_ANEQ(daddr,
4634 &nk->addr[pd->didx], AF_INET))
4635 pf_change_a(&daddr->v4.s_addr,
4636 pd->ip_sum,
4637 nk->addr[pd->didx].v4.s_addr, 0);
4638 break;
4639 #endif /* INET */
4640 #ifdef INET6
4641 case AF_INET6:
4642 if (PF_ANEQ(saddr,
4643 &nk->addr[pd->sidx], AF_INET6))
4644 PF_ACPY(saddr, &nk->addr[pd->sidx], af);
4645
4646 if (PF_ANEQ(daddr,
4647 &nk->addr[pd->didx], AF_INET6))
4648 PF_ACPY(daddr, &nk->addr[pd->didx], af);
4649 break;
4650 #endif /* INET */
4651 }
4652 break;
4653 }
4654 if (nr->natpass)
4655 r = NULL;
4656 pd->nat_rule = nr;
4657 }
4658
4659 SLIST_INIT(&match_rules);
4660 while (r != NULL) {
4661 pf_counter_u64_add(&r->evaluations, 1);
4662 if (pfi_kkif_match(r->kif, kif) == r->ifnot)
4663 r = r->skip[PF_SKIP_IFP].ptr;
4664 else if (r->direction && r->direction != pd->dir)
4665 r = r->skip[PF_SKIP_DIR].ptr;
4666 else if (r->af && r->af != af)
4667 r = r->skip[PF_SKIP_AF].ptr;
4668 else if (r->proto && r->proto != pd->proto)
4669 r = r->skip[PF_SKIP_PROTO].ptr;
4670 else if (PF_MISMATCHAW(&r->src.addr, saddr, af,
4671 r->src.neg, kif, M_GETFIB(m)))
4672 r = r->skip[PF_SKIP_SRC_ADDR].ptr;
4673 /* tcp/udp only. port_op always 0 in other cases */
4674 else if (r->src.port_op && !pf_match_port(r->src.port_op,
4675 r->src.port[0], r->src.port[1], sport))
4676 r = r->skip[PF_SKIP_SRC_PORT].ptr;
4677 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af,
4678 r->dst.neg, NULL, M_GETFIB(m)))
4679 r = r->skip[PF_SKIP_DST_ADDR].ptr;
4680 /* tcp/udp only. port_op always 0 in other cases */
4681 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
4682 r->dst.port[0], r->dst.port[1], dport))
4683 r = r->skip[PF_SKIP_DST_PORT].ptr;
4684 /* icmp only. type always 0 in other cases */
4685 else if (r->type && r->type != icmptype + 1)
4686 r = TAILQ_NEXT(r, entries);
4687 /* icmp only. type always 0 in other cases */
4688 else if (r->code && r->code != icmpcode + 1)
4689 r = TAILQ_NEXT(r, entries);
4690 else if (r->tos && !(r->tos == pd->tos))
4691 r = TAILQ_NEXT(r, entries);
4692 else if (r->rule_flag & PFRULE_FRAGMENT)
4693 r = TAILQ_NEXT(r, entries);
4694 else if (pd->proto == IPPROTO_TCP &&
4695 (r->flagset & th->th_flags) != r->flags)
4696 r = TAILQ_NEXT(r, entries);
4697 /* tcp/udp only. uid.op always 0 in other cases */
4698 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done =
4699 pf_socket_lookup(pd, m), 1)) &&
4700 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
4701 pd->lookup.uid))
4702 r = TAILQ_NEXT(r, entries);
4703 /* tcp/udp only. gid.op always 0 in other cases */
4704 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done =
4705 pf_socket_lookup(pd, m), 1)) &&
4706 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
4707 pd->lookup.gid))
4708 r = TAILQ_NEXT(r, entries);
4709 else if (r->prio &&
4710 !pf_match_ieee8021q_pcp(r->prio, m))
4711 r = TAILQ_NEXT(r, entries);
4712 else if (r->prob &&
4713 r->prob <= arc4random())
4714 r = TAILQ_NEXT(r, entries);
4715 else if (r->match_tag && !pf_match_tag(m, r, &tag,
4716 pd->pf_mtag ? pd->pf_mtag->tag : 0))
4717 r = TAILQ_NEXT(r, entries);
4718 else if (r->os_fingerprint != PF_OSFP_ANY &&
4719 (pd->proto != IPPROTO_TCP || !pf_osfp_match(
4720 pf_osfp_fingerprint(pd, m, off, th),
4721 r->os_fingerprint)))
4722 r = TAILQ_NEXT(r, entries);
4723 else {
4724 if (r->tag)
4725 tag = r->tag;
4726 if (r->anchor == NULL) {
4727 if (r->action == PF_MATCH) {
4728 ri = malloc(sizeof(struct pf_krule_item), M_PF_RULE_ITEM, M_NOWAIT | M_ZERO);
4729 if (ri == NULL) {
4730 REASON_SET(&reason, PFRES_MEMORY);
4731 goto cleanup;
4732 }
4733 ri->r = r;
4734 SLIST_INSERT_HEAD(&match_rules, ri, entry);
4735 pf_counter_u64_critical_enter();
4736 pf_counter_u64_add_protected(&r->packets[pd->dir == PF_OUT], 1);
4737 pf_counter_u64_add_protected(&r->bytes[pd->dir == PF_OUT], pd->tot_len);
4738 pf_counter_u64_critical_exit();
4739 pf_rule_to_actions(r, &pd->act);
4740 if (r->log)
4741 PFLOG_PACKET(kif, m, af,
4742 r->action, PFRES_MATCH, r,
4743 a, ruleset, pd, 1);
4744 } else {
4745 match = 1;
4746 *rm = r;
4747 *am = a;
4748 *rsm = ruleset;
4749 }
4750 if ((*rm)->quick)
4751 break;
4752 r = TAILQ_NEXT(r, entries);
4753 } else
4754 pf_step_into_anchor(anchor_stack, &asd,
4755 &ruleset, PF_RULESET_FILTER, &r, &a,
4756 &match);
4757 }
4758 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd,
4759 &ruleset, PF_RULESET_FILTER, &r, &a, &match))
4760 break;
4761 }
4762 r = *rm;
4763 a = *am;
4764 ruleset = *rsm;
4765
4766 REASON_SET(&reason, PFRES_MATCH);
4767
4768 /* apply actions for last matching pass/block rule */
4769 pf_rule_to_actions(r, &pd->act);
4770
4771 if (r->log) {
4772 if (rewrite)
4773 m_copyback(m, off, hdrlen, pd->hdr.any);
4774 PFLOG_PACKET(kif, m, af, r->action, reason, r, a, ruleset, pd, 1);
4775 }
4776
4777 if ((r->action == PF_DROP) &&
4778 ((r->rule_flag & PFRULE_RETURNRST) ||
4779 (r->rule_flag & PFRULE_RETURNICMP) ||
4780 (r->rule_flag & PFRULE_RETURN))) {
4781 pf_return(r, nr, pd, sk, off, m, th, kif, bproto_sum,
4782 bip_sum, hdrlen, &reason, r->rtableid);
4783 }
4784
4785 if (r->action == PF_DROP)
4786 goto cleanup;
4787
4788 if (tag > 0 && pf_tag_packet(m, pd, tag)) {
4789 REASON_SET(&reason, PFRES_MEMORY);
4790 goto cleanup;
4791 }
4792 if (pd->act.rtableid >= 0)
4793 M_SETFIB(m, pd->act.rtableid);
4794
4795 if (!state_icmp && (r->keep_state || nr != NULL ||
4796 (pd->flags & PFDESC_TCP_NORM))) {
4797 int action;
4798 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off,
4799 sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum,
4800 hdrlen, &match_rules);
4801 if (action != PF_PASS) {
4802 if (action == PF_DROP &&
4803 (r->rule_flag & PFRULE_RETURN))
4804 pf_return(r, nr, pd, sk, off, m, th, kif,
4805 bproto_sum, bip_sum, hdrlen, &reason,
4806 pd->act.rtableid);
4807 return (action);
4808 }
4809 } else {
4810 while ((ri = SLIST_FIRST(&match_rules))) {
4811 SLIST_REMOVE_HEAD(&match_rules, entry);
4812 free(ri, M_PF_RULE_ITEM);
4813 }
4814
4815 uma_zfree(V_pf_state_key_z, sk);
4816 uma_zfree(V_pf_state_key_z, nk);
4817 }
4818
4819 /* copy back packet headers if we performed NAT operations */
4820 if (rewrite)
4821 m_copyback(m, off, hdrlen, pd->hdr.any);
4822
4823 if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) &&
4824 pd->dir == PF_OUT &&
4825 V_pfsync_defer_ptr != NULL && V_pfsync_defer_ptr(*sm, m))
4826 /*
4827 * We want the state created, but we dont
4828 * want to send this in case a partner
4829 * firewall has to know about it to allow
4830 * replies through it.
4831 */
4832 return (PF_DEFER);
4833
4834 return (PF_PASS);
4835
4836 cleanup:
4837 while ((ri = SLIST_FIRST(&match_rules))) {
4838 SLIST_REMOVE_HEAD(&match_rules, entry);
4839 free(ri, M_PF_RULE_ITEM);
4840 }
4841
4842 uma_zfree(V_pf_state_key_z, sk);
4843 uma_zfree(V_pf_state_key_z, nk);
4844 return (PF_DROP);
4845 }
4846
4847 static int
pf_create_state(struct pf_krule * r,struct pf_krule * nr,struct pf_krule * a,struct pf_pdesc * pd,struct pf_ksrc_node * nsn,struct pf_state_key * nk,struct pf_state_key * sk,struct mbuf * m,int off,u_int16_t sport,u_int16_t dport,int * rewrite,struct pfi_kkif * kif,struct pf_kstate ** sm,int tag,u_int16_t bproto_sum,u_int16_t bip_sum,int hdrlen,struct pf_krule_slist * match_rules)4848 pf_create_state(struct pf_krule *r, struct pf_krule *nr, struct pf_krule *a,
4849 struct pf_pdesc *pd, struct pf_ksrc_node *nsn, struct pf_state_key *nk,
4850 struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport,
4851 u_int16_t dport, int *rewrite, struct pfi_kkif *kif, struct pf_kstate **sm,
4852 int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen,
4853 struct pf_krule_slist *match_rules)
4854 {
4855 struct pf_kstate *s = NULL;
4856 struct pf_ksrc_node *sn = NULL;
4857 struct tcphdr *th = &pd->hdr.tcp;
4858 u_int16_t mss = V_tcp_mssdflt;
4859 u_short reason, sn_reason;
4860 struct pf_krule_item *ri;
4861
4862 /* check maximums */
4863 if (r->max_states &&
4864 (counter_u64_fetch(r->states_cur) >= r->max_states)) {
4865 counter_u64_add(V_pf_status.lcounters[LCNT_STATES], 1);
4866 REASON_SET(&reason, PFRES_MAXSTATES);
4867 goto csfailed;
4868 }
4869 /* src node for filter rule */
4870 if ((r->rule_flag & PFRULE_SRCTRACK ||
4871 r->rpool.opts & PF_POOL_STICKYADDR) &&
4872 (sn_reason = pf_insert_src_node(&sn, r, pd->src, pd->af)) != 0) {
4873 REASON_SET(&reason, sn_reason);
4874 goto csfailed;
4875 }
4876 /* src node for translation rule */
4877 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
4878 (sn_reason = pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx],
4879 pd->af)) != 0 ) {
4880 REASON_SET(&reason, sn_reason);
4881 goto csfailed;
4882 }
4883 s = pf_alloc_state(M_NOWAIT);
4884 if (s == NULL) {
4885 REASON_SET(&reason, PFRES_MEMORY);
4886 goto csfailed;
4887 }
4888 s->rule.ptr = r;
4889 s->nat_rule.ptr = nr;
4890 s->anchor.ptr = a;
4891 bcopy(match_rules, &s->match_rules, sizeof(s->match_rules));
4892 memcpy(&s->act, &pd->act, sizeof(struct pf_rule_actions));
4893
4894 STATE_INC_COUNTERS(s);
4895 if (r->allow_opts)
4896 s->state_flags |= PFSTATE_ALLOWOPTS;
4897 if (r->rule_flag & PFRULE_STATESLOPPY)
4898 s->state_flags |= PFSTATE_SLOPPY;
4899 if (pd->flags & PFDESC_TCP_NORM) /* Set by old-style scrub rules */
4900 s->state_flags |= PFSTATE_SCRUB_TCP;
4901 if ((r->rule_flag & PFRULE_PFLOW) ||
4902 (nr != NULL && nr->rule_flag & PFRULE_PFLOW))
4903 s->state_flags |= PFSTATE_PFLOW;
4904
4905 s->act.log = pd->act.log & PF_LOG_ALL;
4906 s->sync_state = PFSYNC_S_NONE;
4907 s->state_flags |= pd->act.flags; /* Only needed for pfsync and state export */
4908
4909 if (nr != NULL)
4910 s->act.log |= nr->log & PF_LOG_ALL;
4911 switch (pd->proto) {
4912 case IPPROTO_TCP:
4913 s->src.seqlo = ntohl(th->th_seq);
4914 s->src.seqhi = s->src.seqlo + pd->p_len + 1;
4915 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
4916 r->keep_state == PF_STATE_MODULATE) {
4917 /* Generate sequence number modulator */
4918 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) ==
4919 0)
4920 s->src.seqdiff = 1;
4921 pf_change_proto_a(m, &th->th_seq, &th->th_sum,
4922 htonl(s->src.seqlo + s->src.seqdiff), 0);
4923 *rewrite = 1;
4924 } else
4925 s->src.seqdiff = 0;
4926 if (th->th_flags & TH_SYN) {
4927 s->src.seqhi++;
4928 s->src.wscale = pf_get_wscale(m, off,
4929 th->th_off, pd->af);
4930 }
4931 s->src.max_win = MAX(ntohs(th->th_win), 1);
4932 if (s->src.wscale & PF_WSCALE_MASK) {
4933 /* Remove scale factor from initial window */
4934 int win = s->src.max_win;
4935 win += 1 << (s->src.wscale & PF_WSCALE_MASK);
4936 s->src.max_win = (win - 1) >>
4937 (s->src.wscale & PF_WSCALE_MASK);
4938 }
4939 if (th->th_flags & TH_FIN)
4940 s->src.seqhi++;
4941 s->dst.seqhi = 1;
4942 s->dst.max_win = 1;
4943 pf_set_protostate(s, PF_PEER_SRC, TCPS_SYN_SENT);
4944 pf_set_protostate(s, PF_PEER_DST, TCPS_CLOSED);
4945 s->timeout = PFTM_TCP_FIRST_PACKET;
4946 atomic_add_32(&V_pf_status.states_halfopen, 1);
4947 break;
4948 case IPPROTO_UDP:
4949 pf_set_protostate(s, PF_PEER_SRC, PFUDPS_SINGLE);
4950 pf_set_protostate(s, PF_PEER_DST, PFUDPS_NO_TRAFFIC);
4951 s->timeout = PFTM_UDP_FIRST_PACKET;
4952 break;
4953 case IPPROTO_SCTP:
4954 pf_set_protostate(s, PF_PEER_SRC, SCTP_COOKIE_WAIT);
4955 pf_set_protostate(s, PF_PEER_DST, SCTP_CLOSED);
4956 s->timeout = PFTM_SCTP_FIRST_PACKET;
4957 break;
4958 case IPPROTO_ICMP:
4959 #ifdef INET6
4960 case IPPROTO_ICMPV6:
4961 #endif
4962 s->timeout = PFTM_ICMP_FIRST_PACKET;
4963 break;
4964 default:
4965 pf_set_protostate(s, PF_PEER_SRC, PFOTHERS_SINGLE);
4966 pf_set_protostate(s, PF_PEER_DST, PFOTHERS_NO_TRAFFIC);
4967 s->timeout = PFTM_OTHER_FIRST_PACKET;
4968 }
4969
4970 if (r->rt) {
4971 /* pf_map_addr increases the reason counters */
4972 if ((reason = pf_map_addr(pd->af, r, pd->src, &s->rt_addr,
4973 &s->rt_kif, NULL, &sn)) != 0)
4974 goto csfailed;
4975 s->rt = r->rt;
4976 }
4977
4978 s->creation = s->expire = pf_get_uptime();
4979
4980 if (sn != NULL)
4981 s->src_node = sn;
4982 if (nsn != NULL) {
4983 /* XXX We only modify one side for now. */
4984 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af);
4985 s->nat_src_node = nsn;
4986 }
4987 if (pd->proto == IPPROTO_TCP) {
4988 if (s->state_flags & PFSTATE_SCRUB_TCP &&
4989 pf_normalize_tcp_init(m, off, pd, th, &s->src, &s->dst)) {
4990 REASON_SET(&reason, PFRES_MEMORY);
4991 goto drop;
4992 }
4993 if (s->state_flags & PFSTATE_SCRUB_TCP && s->src.scrub &&
4994 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s,
4995 &s->src, &s->dst, rewrite)) {
4996 /* This really shouldn't happen!!! */
4997 DPFPRINTF(PF_DEBUG_URGENT,
4998 ("pf_normalize_tcp_stateful failed on first "
4999 "pkt\n"));
5000 goto drop;
5001 }
5002 } else if (pd->proto == IPPROTO_SCTP) {
5003 if (pf_normalize_sctp_init(m, off, pd, &s->src, &s->dst))
5004 goto drop;
5005 if (! (pd->sctp_flags & (PFDESC_SCTP_INIT | PFDESC_SCTP_ADD_IP)))
5006 goto drop;
5007 }
5008 s->direction = pd->dir;
5009
5010 /*
5011 * sk/nk could already been setup by pf_get_translation().
5012 */
5013 if (nr == NULL) {
5014 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p",
5015 __func__, nr, sk, nk));
5016 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport);
5017 if (sk == NULL)
5018 goto csfailed;
5019 nk = sk;
5020 } else
5021 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p",
5022 __func__, nr, sk, nk));
5023
5024 /* Swap sk/nk for PF_OUT. */
5025 if (pf_state_insert(BOUND_IFACE(s, kif), kif,
5026 (pd->dir == PF_IN) ? sk : nk,
5027 (pd->dir == PF_IN) ? nk : sk, s)) {
5028 REASON_SET(&reason, PFRES_STATEINS);
5029 goto drop;
5030 } else
5031 *sm = s;
5032
5033 if (tag > 0)
5034 s->tag = tag;
5035 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) ==
5036 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) {
5037 pf_set_protostate(s, PF_PEER_SRC, PF_TCPS_PROXY_SRC);
5038 /* undo NAT changes, if they have taken place */
5039 if (nr != NULL) {
5040 struct pf_state_key *skt = s->key[PF_SK_WIRE];
5041 if (pd->dir == PF_OUT)
5042 skt = s->key[PF_SK_STACK];
5043 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af);
5044 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af);
5045 if (pd->sport)
5046 *pd->sport = skt->port[pd->sidx];
5047 if (pd->dport)
5048 *pd->dport = skt->port[pd->didx];
5049 if (pd->proto_sum)
5050 *pd->proto_sum = bproto_sum;
5051 if (pd->ip_sum)
5052 *pd->ip_sum = bip_sum;
5053 m_copyback(m, off, hdrlen, pd->hdr.any);
5054 }
5055 s->src.seqhi = htonl(arc4random());
5056 /* Find mss option */
5057 int rtid = M_GETFIB(m);
5058 mss = pf_get_mss(m, off, th->th_off, pd->af);
5059 mss = pf_calc_mss(pd->src, pd->af, rtid, mss);
5060 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss);
5061 s->src.mss = mss;
5062 pf_send_tcp(r, pd->af, pd->dst, pd->src, th->th_dport,
5063 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
5064 TH_SYN|TH_ACK, 0, s->src.mss, 0, true, 0, 0,
5065 pd->act.rtableid);
5066 REASON_SET(&reason, PFRES_SYNPROXY);
5067 return (PF_SYNPROXY_DROP);
5068 }
5069
5070 return (PF_PASS);
5071
5072 csfailed:
5073 while ((ri = SLIST_FIRST(match_rules))) {
5074 SLIST_REMOVE_HEAD(match_rules, entry);
5075 free(ri, M_PF_RULE_ITEM);
5076 }
5077
5078 uma_zfree(V_pf_state_key_z, sk);
5079 uma_zfree(V_pf_state_key_z, nk);
5080
5081 if (sn != NULL) {
5082 PF_SRC_NODE_LOCK(sn);
5083 if (--sn->states == 0 && sn->expire == 0) {
5084 pf_unlink_src_node(sn);
5085 uma_zfree(V_pf_sources_z, sn);
5086 counter_u64_add(
5087 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1);
5088 }
5089 PF_SRC_NODE_UNLOCK(sn);
5090 }
5091
5092 if (nsn != sn && nsn != NULL) {
5093 PF_SRC_NODE_LOCK(nsn);
5094 if (--nsn->states == 0 && nsn->expire == 0) {
5095 pf_unlink_src_node(nsn);
5096 uma_zfree(V_pf_sources_z, nsn);
5097 counter_u64_add(
5098 V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1);
5099 }
5100 PF_SRC_NODE_UNLOCK(nsn);
5101 }
5102
5103 drop:
5104 if (s != NULL) {
5105 pf_src_tree_remove_state(s);
5106 s->timeout = PFTM_UNLINKED;
5107 STATE_DEC_COUNTERS(s);
5108 pf_free_state(s);
5109 }
5110
5111 return (PF_DROP);
5112 }
5113
5114 static int
pf_test_fragment(struct pf_krule ** rm,struct pfi_kkif * kif,struct mbuf * m,void * h,struct pf_pdesc * pd,struct pf_krule ** am,struct pf_kruleset ** rsm)5115 pf_test_fragment(struct pf_krule **rm, struct pfi_kkif *kif,
5116 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_krule **am,
5117 struct pf_kruleset **rsm)
5118 {
5119 struct pf_krule *r, *a = NULL;
5120 struct pf_kruleset *ruleset = NULL;
5121 struct pf_krule_slist match_rules;
5122 struct pf_krule_item *ri;
5123 sa_family_t af = pd->af;
5124 u_short reason;
5125 int tag = -1;
5126 int asd = 0;
5127 int match = 0;
5128 struct pf_kanchor_stackframe anchor_stack[PF_ANCHOR_STACKSIZE];
5129
5130 PF_RULES_RASSERT();
5131
5132 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
5133 SLIST_INIT(&match_rules);
5134 while (r != NULL) {
5135 pf_counter_u64_add(&r->evaluations, 1);
5136 if (pfi_kkif_match(r->kif, kif) == r->ifnot)
5137 r = r->skip[PF_SKIP_IFP].ptr;
5138 else if (r->direction && r->direction != pd->dir)
5139 r = r->skip[PF_SKIP_DIR].ptr;
5140 else if (r->af && r->af != af)
5141 r = r->skip[PF_SKIP_AF].ptr;
5142 else if (r->proto && r->proto != pd->proto)
5143 r = r->skip[PF_SKIP_PROTO].ptr;
5144 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af,
5145 r->src.neg, kif, M_GETFIB(m)))
5146 r = r->skip[PF_SKIP_SRC_ADDR].ptr;
5147 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af,
5148 r->dst.neg, NULL, M_GETFIB(m)))
5149 r = r->skip[PF_SKIP_DST_ADDR].ptr;
5150 else if (r->tos && !(r->tos == pd->tos))
5151 r = TAILQ_NEXT(r, entries);
5152 else if (r->os_fingerprint != PF_OSFP_ANY)
5153 r = TAILQ_NEXT(r, entries);
5154 else if (pd->proto == IPPROTO_UDP &&
5155 (r->src.port_op || r->dst.port_op))
5156 r = TAILQ_NEXT(r, entries);
5157 else if (pd->proto == IPPROTO_TCP &&
5158 (r->src.port_op || r->dst.port_op || r->flagset))
5159 r = TAILQ_NEXT(r, entries);
5160 else if ((pd->proto == IPPROTO_ICMP ||
5161 pd->proto == IPPROTO_ICMPV6) &&
5162 (r->type || r->code))
5163 r = TAILQ_NEXT(r, entries);
5164 else if (r->prio &&
5165 !pf_match_ieee8021q_pcp(r->prio, m))
5166 r = TAILQ_NEXT(r, entries);
5167 else if (r->prob && r->prob <=
5168 (arc4random() % (UINT_MAX - 1) + 1))
5169 r = TAILQ_NEXT(r, entries);
5170 else if (r->match_tag && !pf_match_tag(m, r, &tag,
5171 pd->pf_mtag ? pd->pf_mtag->tag : 0))
5172 r = TAILQ_NEXT(r, entries);
5173 else {
5174 if (r->anchor == NULL) {
5175 if (r->action == PF_MATCH) {
5176 ri = malloc(sizeof(struct pf_krule_item), M_PF_RULE_ITEM, M_NOWAIT | M_ZERO);
5177 if (ri == NULL) {
5178 REASON_SET(&reason, PFRES_MEMORY);
5179 goto cleanup;
5180 }
5181 ri->r = r;
5182 SLIST_INSERT_HEAD(&match_rules, ri, entry);
5183 pf_counter_u64_critical_enter();
5184 pf_counter_u64_add_protected(&r->packets[pd->dir == PF_OUT], 1);
5185 pf_counter_u64_add_protected(&r->bytes[pd->dir == PF_OUT], pd->tot_len);
5186 pf_counter_u64_critical_exit();
5187 pf_rule_to_actions(r, &pd->act);
5188 if (r->log)
5189 PFLOG_PACKET(kif, m, af,
5190 r->action, PFRES_MATCH, r,
5191 a, ruleset, pd, 1);
5192 } else {
5193 match = 1;
5194 *rm = r;
5195 *am = a;
5196 *rsm = ruleset;
5197 }
5198 if ((*rm)->quick)
5199 break;
5200 r = TAILQ_NEXT(r, entries);
5201 } else
5202 pf_step_into_anchor(anchor_stack, &asd,
5203 &ruleset, PF_RULESET_FILTER, &r, &a,
5204 &match);
5205 }
5206 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd,
5207 &ruleset, PF_RULESET_FILTER, &r, &a, &match))
5208 break;
5209 }
5210 r = *rm;
5211 a = *am;
5212 ruleset = *rsm;
5213
5214 REASON_SET(&reason, PFRES_MATCH);
5215
5216 /* apply actions for last matching pass/block rule */
5217 pf_rule_to_actions(r, &pd->act);
5218
5219 if (r->log)
5220 PFLOG_PACKET(kif, m, af, r->action, reason, r, a, ruleset, pd, 1);
5221
5222 if (r->action != PF_PASS)
5223 return (PF_DROP);
5224
5225 if (tag > 0 && pf_tag_packet(m, pd, tag)) {
5226 REASON_SET(&reason, PFRES_MEMORY);
5227 goto cleanup;
5228 }
5229
5230 return (PF_PASS);
5231
5232 cleanup:
5233 while ((ri = SLIST_FIRST(&match_rules))) {
5234 SLIST_REMOVE_HEAD(&match_rules, entry);
5235 free(ri, M_PF_RULE_ITEM);
5236 }
5237
5238 return (PF_DROP);
5239 }
5240
5241 static int
pf_tcp_track_full(struct pf_kstate ** state,struct pfi_kkif * kif,struct mbuf * m,int off,struct pf_pdesc * pd,u_short * reason,int * copyback)5242 pf_tcp_track_full(struct pf_kstate **state, struct pfi_kkif *kif,
5243 struct mbuf *m, int off, struct pf_pdesc *pd, u_short *reason,
5244 int *copyback)
5245 {
5246 struct tcphdr *th = &pd->hdr.tcp;
5247 struct pf_state_peer *src, *dst;
5248 u_int16_t win = ntohs(th->th_win);
5249 u_int32_t ack, end, data_end, seq, orig_seq;
5250 u_int8_t sws, dws, psrc, pdst;
5251 int ackskew;
5252
5253 if (pd->dir == (*state)->direction) {
5254 src = &(*state)->src;
5255 dst = &(*state)->dst;
5256 psrc = PF_PEER_SRC;
5257 pdst = PF_PEER_DST;
5258 } else {
5259 src = &(*state)->dst;
5260 dst = &(*state)->src;
5261 psrc = PF_PEER_DST;
5262 pdst = PF_PEER_SRC;
5263 }
5264
5265 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
5266 sws = src->wscale & PF_WSCALE_MASK;
5267 dws = dst->wscale & PF_WSCALE_MASK;
5268 } else
5269 sws = dws = 0;
5270
5271 /*
5272 * Sequence tracking algorithm from Guido van Rooij's paper:
5273 * http://www.madison-gurkha.com/publications/tcp_filtering/
5274 * tcp_filtering.ps
5275 */
5276
5277 orig_seq = seq = ntohl(th->th_seq);
5278 if (src->seqlo == 0) {
5279 /* First packet from this end. Set its state */
5280
5281 if (((*state)->state_flags & PFSTATE_SCRUB_TCP || dst->scrub) &&
5282 src->scrub == NULL) {
5283 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
5284 REASON_SET(reason, PFRES_MEMORY);
5285 return (PF_DROP);
5286 }
5287 }
5288
5289 /* Deferred generation of sequence number modulator */
5290 if (dst->seqdiff && !src->seqdiff) {
5291 /* use random iss for the TCP server */
5292 while ((src->seqdiff = arc4random() - seq) == 0)
5293 ;
5294 ack = ntohl(th->th_ack) - dst->seqdiff;
5295 pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq +
5296 src->seqdiff), 0);
5297 pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0);
5298 *copyback = 1;
5299 } else {
5300 ack = ntohl(th->th_ack);
5301 }
5302
5303 end = seq + pd->p_len;
5304 if (th->th_flags & TH_SYN) {
5305 end++;
5306 if (dst->wscale & PF_WSCALE_FLAG) {
5307 src->wscale = pf_get_wscale(m, off, th->th_off,
5308 pd->af);
5309 if (src->wscale & PF_WSCALE_FLAG) {
5310 /* Remove scale factor from initial
5311 * window */
5312 sws = src->wscale & PF_WSCALE_MASK;
5313 win = ((u_int32_t)win + (1 << sws) - 1)
5314 >> sws;
5315 dws = dst->wscale & PF_WSCALE_MASK;
5316 } else {
5317 /* fixup other window */
5318 dst->max_win = MIN(TCP_MAXWIN,
5319 (u_int32_t)dst->max_win <<
5320 (dst->wscale & PF_WSCALE_MASK));
5321 /* in case of a retrans SYN|ACK */
5322 dst->wscale = 0;
5323 }
5324 }
5325 }
5326 data_end = end;
5327 if (th->th_flags & TH_FIN)
5328 end++;
5329
5330 src->seqlo = seq;
5331 if (src->state < TCPS_SYN_SENT)
5332 pf_set_protostate(*state, psrc, TCPS_SYN_SENT);
5333
5334 /*
5335 * May need to slide the window (seqhi may have been set by
5336 * the crappy stack check or if we picked up the connection
5337 * after establishment)
5338 */
5339 if (src->seqhi == 1 ||
5340 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
5341 src->seqhi = end + MAX(1, dst->max_win << dws);
5342 if (win > src->max_win)
5343 src->max_win = win;
5344
5345 } else {
5346 ack = ntohl(th->th_ack) - dst->seqdiff;
5347 if (src->seqdiff) {
5348 /* Modulate sequence numbers */
5349 pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq +
5350 src->seqdiff), 0);
5351 pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0);
5352 *copyback = 1;
5353 }
5354 end = seq + pd->p_len;
5355 if (th->th_flags & TH_SYN)
5356 end++;
5357 data_end = end;
5358 if (th->th_flags & TH_FIN)
5359 end++;
5360 }
5361
5362 if ((th->th_flags & TH_ACK) == 0) {
5363 /* Let it pass through the ack skew check */
5364 ack = dst->seqlo;
5365 } else if ((ack == 0 &&
5366 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
5367 /* broken tcp stacks do not set ack */
5368 (dst->state < TCPS_SYN_SENT)) {
5369 /*
5370 * Many stacks (ours included) will set the ACK number in an
5371 * FIN|ACK if the SYN times out -- no sequence to ACK.
5372 */
5373 ack = dst->seqlo;
5374 }
5375
5376 if (seq == end) {
5377 /* Ease sequencing restrictions on no data packets */
5378 seq = src->seqlo;
5379 data_end = end = seq;
5380 }
5381
5382 ackskew = dst->seqlo - ack;
5383
5384 /*
5385 * Need to demodulate the sequence numbers in any TCP SACK options
5386 * (Selective ACK). We could optionally validate the SACK values
5387 * against the current ACK window, either forwards or backwards, but
5388 * I'm not confident that SACK has been implemented properly
5389 * everywhere. It wouldn't surprise me if several stacks accidentally
5390 * SACK too far backwards of previously ACKed data. There really aren't
5391 * any security implications of bad SACKing unless the target stack
5392 * doesn't validate the option length correctly. Someone trying to
5393 * spoof into a TCP connection won't bother blindly sending SACK
5394 * options anyway.
5395 */
5396 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) {
5397 if (pf_modulate_sack(m, off, pd, th, dst))
5398 *copyback = 1;
5399 }
5400
5401 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */
5402 if (SEQ_GEQ(src->seqhi, data_end) &&
5403 /* Last octet inside other's window space */
5404 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
5405 /* Retrans: not more than one window back */
5406 (ackskew >= -MAXACKWINDOW) &&
5407 /* Acking not more than one reassembled fragment backwards */
5408 (ackskew <= (MAXACKWINDOW << sws)) &&
5409 /* Acking not more than one window forward */
5410 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo ||
5411 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo))) {
5412 /* Require an exact/+1 sequence match on resets when possible */
5413
5414 if (dst->scrub || src->scrub) {
5415 if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
5416 *state, src, dst, copyback))
5417 return (PF_DROP);
5418 }
5419
5420 /* update max window */
5421 if (src->max_win < win)
5422 src->max_win = win;
5423 /* synchronize sequencing */
5424 if (SEQ_GT(end, src->seqlo))
5425 src->seqlo = end;
5426 /* slide the window of what the other end can send */
5427 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
5428 dst->seqhi = ack + MAX((win << sws), 1);
5429
5430 /* update states */
5431 if (th->th_flags & TH_SYN)
5432 if (src->state < TCPS_SYN_SENT)
5433 pf_set_protostate(*state, psrc, TCPS_SYN_SENT);
5434 if (th->th_flags & TH_FIN)
5435 if (src->state < TCPS_CLOSING)
5436 pf_set_protostate(*state, psrc, TCPS_CLOSING);
5437 if (th->th_flags & TH_ACK) {
5438 if (dst->state == TCPS_SYN_SENT) {
5439 pf_set_protostate(*state, pdst,
5440 TCPS_ESTABLISHED);
5441 if (src->state == TCPS_ESTABLISHED &&
5442 (*state)->src_node != NULL &&
5443 pf_src_connlimit(state)) {
5444 REASON_SET(reason, PFRES_SRCLIMIT);
5445 return (PF_DROP);
5446 }
5447 } else if (dst->state == TCPS_CLOSING)
5448 pf_set_protostate(*state, pdst,
5449 TCPS_FIN_WAIT_2);
5450 }
5451 if (th->th_flags & TH_RST)
5452 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_TIME_WAIT);
5453
5454 /* update expire time */
5455 (*state)->expire = pf_get_uptime();
5456 if (src->state >= TCPS_FIN_WAIT_2 &&
5457 dst->state >= TCPS_FIN_WAIT_2)
5458 (*state)->timeout = PFTM_TCP_CLOSED;
5459 else if (src->state >= TCPS_CLOSING &&
5460 dst->state >= TCPS_CLOSING)
5461 (*state)->timeout = PFTM_TCP_FIN_WAIT;
5462 else if (src->state < TCPS_ESTABLISHED ||
5463 dst->state < TCPS_ESTABLISHED)
5464 (*state)->timeout = PFTM_TCP_OPENING;
5465 else if (src->state >= TCPS_CLOSING ||
5466 dst->state >= TCPS_CLOSING)
5467 (*state)->timeout = PFTM_TCP_CLOSING;
5468 else
5469 (*state)->timeout = PFTM_TCP_ESTABLISHED;
5470
5471 /* Fall through to PASS packet */
5472
5473 } else if ((dst->state < TCPS_SYN_SENT ||
5474 dst->state >= TCPS_FIN_WAIT_2 ||
5475 src->state >= TCPS_FIN_WAIT_2) &&
5476 SEQ_GEQ(src->seqhi + MAXACKWINDOW, data_end) &&
5477 /* Within a window forward of the originating packet */
5478 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
5479 /* Within a window backward of the originating packet */
5480
5481 /*
5482 * This currently handles three situations:
5483 * 1) Stupid stacks will shotgun SYNs before their peer
5484 * replies.
5485 * 2) When PF catches an already established stream (the
5486 * firewall rebooted, the state table was flushed, routes
5487 * changed...)
5488 * 3) Packets get funky immediately after the connection
5489 * closes (this should catch Solaris spurious ACK|FINs
5490 * that web servers like to spew after a close)
5491 *
5492 * This must be a little more careful than the above code
5493 * since packet floods will also be caught here. We don't
5494 * update the TTL here to mitigate the damage of a packet
5495 * flood and so the same code can handle awkward establishment
5496 * and a loosened connection close.
5497 * In the establishment case, a correct peer response will
5498 * validate the connection, go through the normal state code
5499 * and keep updating the state TTL.
5500 */
5501
5502 if (V_pf_status.debug >= PF_DEBUG_MISC) {
5503 printf("pf: loose state match: ");
5504 pf_print_state(*state);
5505 pf_print_flags(th->th_flags);
5506 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
5507 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack,
5508 pd->p_len, ackskew, (unsigned long long)(*state)->packets[0],
5509 (unsigned long long)(*state)->packets[1],
5510 pd->dir == PF_IN ? "in" : "out",
5511 pd->dir == (*state)->direction ? "fwd" : "rev");
5512 }
5513
5514 if (dst->scrub || src->scrub) {
5515 if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
5516 *state, src, dst, copyback))
5517 return (PF_DROP);
5518 }
5519
5520 /* update max window */
5521 if (src->max_win < win)
5522 src->max_win = win;
5523 /* synchronize sequencing */
5524 if (SEQ_GT(end, src->seqlo))
5525 src->seqlo = end;
5526 /* slide the window of what the other end can send */
5527 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
5528 dst->seqhi = ack + MAX((win << sws), 1);
5529
5530 /*
5531 * Cannot set dst->seqhi here since this could be a shotgunned
5532 * SYN and not an already established connection.
5533 */
5534
5535 if (th->th_flags & TH_FIN)
5536 if (src->state < TCPS_CLOSING)
5537 pf_set_protostate(*state, psrc, TCPS_CLOSING);
5538 if (th->th_flags & TH_RST)
5539 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_TIME_WAIT);
5540
5541 /* Fall through to PASS packet */
5542
5543 } else {
5544 if ((*state)->dst.state == TCPS_SYN_SENT &&
5545 (*state)->src.state == TCPS_SYN_SENT) {
5546 /* Send RST for state mismatches during handshake */
5547 if (!(th->th_flags & TH_RST))
5548 pf_send_tcp((*state)->rule.ptr, pd->af,
5549 pd->dst, pd->src, th->th_dport,
5550 th->th_sport, ntohl(th->th_ack), 0,
5551 TH_RST, 0, 0,
5552 (*state)->rule.ptr->return_ttl, true, 0, 0,
5553 (*state)->act.rtableid);
5554 src->seqlo = 0;
5555 src->seqhi = 1;
5556 src->max_win = 1;
5557 } else if (V_pf_status.debug >= PF_DEBUG_MISC) {
5558 printf("pf: BAD state: ");
5559 pf_print_state(*state);
5560 pf_print_flags(th->th_flags);
5561 printf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
5562 "pkts=%llu:%llu dir=%s,%s\n",
5563 seq, orig_seq, ack, pd->p_len, ackskew,
5564 (unsigned long long)(*state)->packets[0],
5565 (unsigned long long)(*state)->packets[1],
5566 pd->dir == PF_IN ? "in" : "out",
5567 pd->dir == (*state)->direction ? "fwd" : "rev");
5568 printf("pf: State failure on: %c %c %c %c | %c %c\n",
5569 SEQ_GEQ(src->seqhi, data_end) ? ' ' : '1',
5570 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
5571 ' ': '2',
5572 (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
5573 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
5574 SEQ_GEQ(src->seqhi + MAXACKWINDOW, data_end) ?' ' :'5',
5575 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
5576 }
5577 REASON_SET(reason, PFRES_BADSTATE);
5578 return (PF_DROP);
5579 }
5580
5581 return (PF_PASS);
5582 }
5583
5584 static int
pf_tcp_track_sloppy(struct pf_kstate ** state,struct pf_pdesc * pd,u_short * reason)5585 pf_tcp_track_sloppy(struct pf_kstate **state, struct pf_pdesc *pd, u_short *reason)
5586 {
5587 struct tcphdr *th = &pd->hdr.tcp;
5588 struct pf_state_peer *src, *dst;
5589 u_int8_t psrc, pdst;
5590
5591 if (pd->dir == (*state)->direction) {
5592 src = &(*state)->src;
5593 dst = &(*state)->dst;
5594 psrc = PF_PEER_SRC;
5595 pdst = PF_PEER_DST;
5596 } else {
5597 src = &(*state)->dst;
5598 dst = &(*state)->src;
5599 psrc = PF_PEER_DST;
5600 pdst = PF_PEER_SRC;
5601 }
5602
5603 if (th->th_flags & TH_SYN)
5604 if (src->state < TCPS_SYN_SENT)
5605 pf_set_protostate(*state, psrc, TCPS_SYN_SENT);
5606 if (th->th_flags & TH_FIN)
5607 if (src->state < TCPS_CLOSING)
5608 pf_set_protostate(*state, psrc, TCPS_CLOSING);
5609 if (th->th_flags & TH_ACK) {
5610 if (dst->state == TCPS_SYN_SENT) {
5611 pf_set_protostate(*state, pdst, TCPS_ESTABLISHED);
5612 if (src->state == TCPS_ESTABLISHED &&
5613 (*state)->src_node != NULL &&
5614 pf_src_connlimit(state)) {
5615 REASON_SET(reason, PFRES_SRCLIMIT);
5616 return (PF_DROP);
5617 }
5618 } else if (dst->state == TCPS_CLOSING) {
5619 pf_set_protostate(*state, pdst, TCPS_FIN_WAIT_2);
5620 } else if (src->state == TCPS_SYN_SENT &&
5621 dst->state < TCPS_SYN_SENT) {
5622 /*
5623 * Handle a special sloppy case where we only see one
5624 * half of the connection. If there is a ACK after
5625 * the initial SYN without ever seeing a packet from
5626 * the destination, set the connection to established.
5627 */
5628 pf_set_protostate(*state, PF_PEER_BOTH,
5629 TCPS_ESTABLISHED);
5630 dst->state = src->state = TCPS_ESTABLISHED;
5631 if ((*state)->src_node != NULL &&
5632 pf_src_connlimit(state)) {
5633 REASON_SET(reason, PFRES_SRCLIMIT);
5634 return (PF_DROP);
5635 }
5636 } else if (src->state == TCPS_CLOSING &&
5637 dst->state == TCPS_ESTABLISHED &&
5638 dst->seqlo == 0) {
5639 /*
5640 * Handle the closing of half connections where we
5641 * don't see the full bidirectional FIN/ACK+ACK
5642 * handshake.
5643 */
5644 pf_set_protostate(*state, pdst, TCPS_CLOSING);
5645 }
5646 }
5647 if (th->th_flags & TH_RST)
5648 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_TIME_WAIT);
5649
5650 /* update expire time */
5651 (*state)->expire = pf_get_uptime();
5652 if (src->state >= TCPS_FIN_WAIT_2 &&
5653 dst->state >= TCPS_FIN_WAIT_2)
5654 (*state)->timeout = PFTM_TCP_CLOSED;
5655 else if (src->state >= TCPS_CLOSING &&
5656 dst->state >= TCPS_CLOSING)
5657 (*state)->timeout = PFTM_TCP_FIN_WAIT;
5658 else if (src->state < TCPS_ESTABLISHED ||
5659 dst->state < TCPS_ESTABLISHED)
5660 (*state)->timeout = PFTM_TCP_OPENING;
5661 else if (src->state >= TCPS_CLOSING ||
5662 dst->state >= TCPS_CLOSING)
5663 (*state)->timeout = PFTM_TCP_CLOSING;
5664 else
5665 (*state)->timeout = PFTM_TCP_ESTABLISHED;
5666
5667 return (PF_PASS);
5668 }
5669
5670 static int
pf_synproxy(struct pf_pdesc * pd,struct pf_kstate ** state,u_short * reason)5671 pf_synproxy(struct pf_pdesc *pd, struct pf_kstate **state, u_short *reason)
5672 {
5673 struct pf_state_key *sk = (*state)->key[pd->didx];
5674 struct tcphdr *th = &pd->hdr.tcp;
5675
5676 if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
5677 if (pd->dir != (*state)->direction) {
5678 REASON_SET(reason, PFRES_SYNPROXY);
5679 return (PF_SYNPROXY_DROP);
5680 }
5681 if (th->th_flags & TH_SYN) {
5682 if (ntohl(th->th_seq) != (*state)->src.seqlo) {
5683 REASON_SET(reason, PFRES_SYNPROXY);
5684 return (PF_DROP);
5685 }
5686 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
5687 pd->src, th->th_dport, th->th_sport,
5688 (*state)->src.seqhi, ntohl(th->th_seq) + 1,
5689 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, true, 0, 0,
5690 (*state)->act.rtableid);
5691 REASON_SET(reason, PFRES_SYNPROXY);
5692 return (PF_SYNPROXY_DROP);
5693 } else if ((th->th_flags & (TH_ACK|TH_RST|TH_FIN)) != TH_ACK ||
5694 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
5695 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
5696 REASON_SET(reason, PFRES_SYNPROXY);
5697 return (PF_DROP);
5698 } else if ((*state)->src_node != NULL &&
5699 pf_src_connlimit(state)) {
5700 REASON_SET(reason, PFRES_SRCLIMIT);
5701 return (PF_DROP);
5702 } else
5703 pf_set_protostate(*state, PF_PEER_SRC,
5704 PF_TCPS_PROXY_DST);
5705 }
5706 if ((*state)->src.state == PF_TCPS_PROXY_DST) {
5707 if (pd->dir == (*state)->direction) {
5708 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
5709 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
5710 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
5711 REASON_SET(reason, PFRES_SYNPROXY);
5712 return (PF_DROP);
5713 }
5714 (*state)->src.max_win = MAX(ntohs(th->th_win), 1);
5715 if ((*state)->dst.seqhi == 1)
5716 (*state)->dst.seqhi = htonl(arc4random());
5717 pf_send_tcp((*state)->rule.ptr, pd->af,
5718 &sk->addr[pd->sidx], &sk->addr[pd->didx],
5719 sk->port[pd->sidx], sk->port[pd->didx],
5720 (*state)->dst.seqhi, 0, TH_SYN, 0,
5721 (*state)->src.mss, 0, false, (*state)->tag, 0,
5722 (*state)->act.rtableid);
5723 REASON_SET(reason, PFRES_SYNPROXY);
5724 return (PF_SYNPROXY_DROP);
5725 } else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
5726 (TH_SYN|TH_ACK)) ||
5727 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) {
5728 REASON_SET(reason, PFRES_SYNPROXY);
5729 return (PF_DROP);
5730 } else {
5731 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
5732 (*state)->dst.seqlo = ntohl(th->th_seq);
5733 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
5734 pd->src, th->th_dport, th->th_sport,
5735 ntohl(th->th_ack), ntohl(th->th_seq) + 1,
5736 TH_ACK, (*state)->src.max_win, 0, 0, false,
5737 (*state)->tag, 0, (*state)->act.rtableid);
5738 pf_send_tcp((*state)->rule.ptr, pd->af,
5739 &sk->addr[pd->sidx], &sk->addr[pd->didx],
5740 sk->port[pd->sidx], sk->port[pd->didx],
5741 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
5742 TH_ACK, (*state)->dst.max_win, 0, 0, true, 0, 0,
5743 (*state)->act.rtableid);
5744 (*state)->src.seqdiff = (*state)->dst.seqhi -
5745 (*state)->src.seqlo;
5746 (*state)->dst.seqdiff = (*state)->src.seqhi -
5747 (*state)->dst.seqlo;
5748 (*state)->src.seqhi = (*state)->src.seqlo +
5749 (*state)->dst.max_win;
5750 (*state)->dst.seqhi = (*state)->dst.seqlo +
5751 (*state)->src.max_win;
5752 (*state)->src.wscale = (*state)->dst.wscale = 0;
5753 pf_set_protostate(*state, PF_PEER_BOTH,
5754 TCPS_ESTABLISHED);
5755 REASON_SET(reason, PFRES_SYNPROXY);
5756 return (PF_SYNPROXY_DROP);
5757 }
5758 }
5759
5760 return (PF_PASS);
5761 }
5762
5763 static int
pf_test_state_tcp(struct pf_kstate ** state,struct pfi_kkif * kif,struct mbuf * m,int off,void * h,struct pf_pdesc * pd,u_short * reason)5764 pf_test_state_tcp(struct pf_kstate **state, struct pfi_kkif *kif,
5765 struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
5766 u_short *reason)
5767 {
5768 struct pf_state_key_cmp key;
5769 struct tcphdr *th = &pd->hdr.tcp;
5770 int copyback = 0;
5771 int action;
5772 struct pf_state_peer *src, *dst;
5773
5774 bzero(&key, sizeof(key));
5775 key.af = pd->af;
5776 key.proto = IPPROTO_TCP;
5777 if (pd->dir == PF_IN) { /* wire side, straight */
5778 PF_ACPY(&key.addr[0], pd->src, key.af);
5779 PF_ACPY(&key.addr[1], pd->dst, key.af);
5780 key.port[0] = th->th_sport;
5781 key.port[1] = th->th_dport;
5782 } else { /* stack side, reverse */
5783 PF_ACPY(&key.addr[1], pd->src, key.af);
5784 PF_ACPY(&key.addr[0], pd->dst, key.af);
5785 key.port[1] = th->th_sport;
5786 key.port[0] = th->th_dport;
5787 }
5788
5789 STATE_LOOKUP(kif, &key, *state, pd);
5790
5791 if (pd->dir == (*state)->direction) {
5792 src = &(*state)->src;
5793 dst = &(*state)->dst;
5794 } else {
5795 src = &(*state)->dst;
5796 dst = &(*state)->src;
5797 }
5798
5799 if ((action = pf_synproxy(pd, state, reason)) != PF_PASS)
5800 return (action);
5801
5802 if (dst->state >= TCPS_FIN_WAIT_2 &&
5803 src->state >= TCPS_FIN_WAIT_2 &&
5804 (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) ||
5805 ((th->th_flags & (TH_SYN|TH_ACK|TH_RST)) == TH_ACK &&
5806 pf_syncookie_check(pd) && pd->dir == PF_IN))) {
5807 if (V_pf_status.debug >= PF_DEBUG_MISC) {
5808 printf("pf: state reuse ");
5809 pf_print_state(*state);
5810 pf_print_flags(th->th_flags);
5811 printf("\n");
5812 }
5813 /* XXX make sure it's the same direction ?? */
5814 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_CLOSED);
5815 pf_unlink_state(*state);
5816 *state = NULL;
5817 return (PF_DROP);
5818 }
5819
5820 if ((*state)->state_flags & PFSTATE_SLOPPY) {
5821 if (pf_tcp_track_sloppy(state, pd, reason) == PF_DROP)
5822 return (PF_DROP);
5823 } else {
5824 if (pf_tcp_track_full(state, kif, m, off, pd, reason,
5825 ©back) == PF_DROP)
5826 return (PF_DROP);
5827 }
5828
5829 /* translate source/destination address, if necessary */
5830 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
5831 struct pf_state_key *nk = (*state)->key[pd->didx];
5832
5833 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
5834 nk->port[pd->sidx] != th->th_sport)
5835 pf_change_ap(m, pd->src, &th->th_sport,
5836 pd->ip_sum, &th->th_sum, &nk->addr[pd->sidx],
5837 nk->port[pd->sidx], 0, pd->af);
5838
5839 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
5840 nk->port[pd->didx] != th->th_dport)
5841 pf_change_ap(m, pd->dst, &th->th_dport,
5842 pd->ip_sum, &th->th_sum, &nk->addr[pd->didx],
5843 nk->port[pd->didx], 0, pd->af);
5844 copyback = 1;
5845 }
5846
5847 /* Copyback sequence modulation or stateful scrub changes if needed */
5848 if (copyback)
5849 m_copyback(m, off, sizeof(*th), (caddr_t)th);
5850
5851 return (PF_PASS);
5852 }
5853
5854 static int
pf_test_state_udp(struct pf_kstate ** state,struct pfi_kkif * kif,struct mbuf * m,int off,void * h,struct pf_pdesc * pd)5855 pf_test_state_udp(struct pf_kstate **state, struct pfi_kkif *kif,
5856 struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
5857 {
5858 struct pf_state_peer *src, *dst;
5859 struct pf_state_key_cmp key;
5860 struct udphdr *uh = &pd->hdr.udp;
5861 uint8_t psrc, pdst;
5862
5863 bzero(&key, sizeof(key));
5864 key.af = pd->af;
5865 key.proto = IPPROTO_UDP;
5866 if (pd->dir == PF_IN) { /* wire side, straight */
5867 PF_ACPY(&key.addr[0], pd->src, key.af);
5868 PF_ACPY(&key.addr[1], pd->dst, key.af);
5869 key.port[0] = uh->uh_sport;
5870 key.port[1] = uh->uh_dport;
5871 } else { /* stack side, reverse */
5872 PF_ACPY(&key.addr[1], pd->src, key.af);
5873 PF_ACPY(&key.addr[0], pd->dst, key.af);
5874 key.port[1] = uh->uh_sport;
5875 key.port[0] = uh->uh_dport;
5876 }
5877
5878 STATE_LOOKUP(kif, &key, *state, pd);
5879
5880 if (pd->dir == (*state)->direction) {
5881 src = &(*state)->src;
5882 dst = &(*state)->dst;
5883 psrc = PF_PEER_SRC;
5884 pdst = PF_PEER_DST;
5885 } else {
5886 src = &(*state)->dst;
5887 dst = &(*state)->src;
5888 psrc = PF_PEER_DST;
5889 pdst = PF_PEER_SRC;
5890 }
5891
5892 /* update states */
5893 if (src->state < PFUDPS_SINGLE)
5894 pf_set_protostate(*state, psrc, PFUDPS_SINGLE);
5895 if (dst->state == PFUDPS_SINGLE)
5896 pf_set_protostate(*state, pdst, PFUDPS_MULTIPLE);
5897
5898 /* update expire time */
5899 (*state)->expire = pf_get_uptime();
5900 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
5901 (*state)->timeout = PFTM_UDP_MULTIPLE;
5902 else
5903 (*state)->timeout = PFTM_UDP_SINGLE;
5904
5905 /* translate source/destination address, if necessary */
5906 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
5907 struct pf_state_key *nk = (*state)->key[pd->didx];
5908
5909 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
5910 nk->port[pd->sidx] != uh->uh_sport)
5911 pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum,
5912 &uh->uh_sum, &nk->addr[pd->sidx],
5913 nk->port[pd->sidx], 1, pd->af);
5914
5915 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
5916 nk->port[pd->didx] != uh->uh_dport)
5917 pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum,
5918 &uh->uh_sum, &nk->addr[pd->didx],
5919 nk->port[pd->didx], 1, pd->af);
5920 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
5921 }
5922
5923 return (PF_PASS);
5924 }
5925
5926 static int
pf_test_state_sctp(struct pf_kstate ** state,struct pfi_kkif * kif,struct mbuf * m,int off,void * h,struct pf_pdesc * pd,u_short * reason)5927 pf_test_state_sctp(struct pf_kstate **state, struct pfi_kkif *kif,
5928 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason)
5929 {
5930 struct pf_state_key_cmp key;
5931 struct pf_state_peer *src, *dst;
5932 struct sctphdr *sh = &pd->hdr.sctp;
5933 u_int8_t psrc; //, pdst;
5934
5935 bzero(&key, sizeof(key));
5936 key.af = pd->af;
5937 key.proto = IPPROTO_SCTP;
5938 if (pd->dir == PF_IN) { /* wire side, straight */
5939 PF_ACPY(&key.addr[0], pd->src, key.af);
5940 PF_ACPY(&key.addr[1], pd->dst, key.af);
5941 key.port[0] = sh->src_port;
5942 key.port[1] = sh->dest_port;
5943 } else { /* stack side, reverse */
5944 PF_ACPY(&key.addr[1], pd->src, key.af);
5945 PF_ACPY(&key.addr[0], pd->dst, key.af);
5946 key.port[1] = sh->src_port;
5947 key.port[0] = sh->dest_port;
5948 }
5949
5950 STATE_LOOKUP(kif, &key, *state, pd);
5951
5952 if (pd->dir == (*state)->direction) {
5953 src = &(*state)->src;
5954 dst = &(*state)->dst;
5955 psrc = PF_PEER_SRC;
5956 } else {
5957 src = &(*state)->dst;
5958 dst = &(*state)->src;
5959 psrc = PF_PEER_DST;
5960 }
5961
5962 /* Track state. */
5963 if (pd->sctp_flags & PFDESC_SCTP_INIT) {
5964 if (src->state < SCTP_COOKIE_WAIT) {
5965 pf_set_protostate(*state, psrc, SCTP_COOKIE_WAIT);
5966 (*state)->timeout = PFTM_SCTP_OPENING;
5967 }
5968 }
5969 if (pd->sctp_flags & PFDESC_SCTP_INIT_ACK) {
5970 MPASS(dst->scrub != NULL);
5971 if (dst->scrub->pfss_v_tag == 0)
5972 dst->scrub->pfss_v_tag = pd->sctp_initiate_tag;
5973 }
5974
5975 if (pd->sctp_flags & (PFDESC_SCTP_COOKIE | PFDESC_SCTP_HEARTBEAT_ACK)) {
5976 if (src->state < SCTP_ESTABLISHED) {
5977 pf_set_protostate(*state, psrc, SCTP_ESTABLISHED);
5978 (*state)->timeout = PFTM_SCTP_ESTABLISHED;
5979 }
5980 }
5981 if (pd->sctp_flags & (PFDESC_SCTP_SHUTDOWN | PFDESC_SCTP_ABORT |
5982 PFDESC_SCTP_SHUTDOWN_COMPLETE)) {
5983 if (src->state < SCTP_SHUTDOWN_PENDING) {
5984 pf_set_protostate(*state, psrc, SCTP_SHUTDOWN_PENDING);
5985 (*state)->timeout = PFTM_SCTP_CLOSING;
5986 }
5987 }
5988 if (pd->sctp_flags & (PFDESC_SCTP_SHUTDOWN_COMPLETE)) {
5989 pf_set_protostate(*state, psrc, SCTP_CLOSED);
5990 (*state)->timeout = PFTM_SCTP_CLOSED;
5991 }
5992
5993 if (src->scrub != NULL) {
5994 if (src->scrub->pfss_v_tag == 0) {
5995 src->scrub->pfss_v_tag = pd->hdr.sctp.v_tag;
5996 } else if (src->scrub->pfss_v_tag != pd->hdr.sctp.v_tag)
5997 return (PF_DROP);
5998 }
5999
6000 (*state)->expire = pf_get_uptime();
6001
6002 /* translate source/destination address, if necessary */
6003 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
6004 uint16_t checksum = 0;
6005 struct pf_state_key *nk = (*state)->key[pd->didx];
6006
6007 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
6008 nk->port[pd->sidx] != pd->hdr.sctp.src_port) {
6009 pf_change_ap(m, pd->src, &pd->hdr.sctp.src_port,
6010 pd->ip_sum, &checksum, &nk->addr[pd->sidx],
6011 nk->port[pd->sidx], 1, pd->af);
6012 }
6013
6014 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
6015 nk->port[pd->didx] != pd->hdr.sctp.dest_port) {
6016 pf_change_ap(m, pd->dst, &pd->hdr.sctp.dest_port,
6017 pd->ip_sum, &checksum, &nk->addr[pd->didx],
6018 nk->port[pd->didx], 1, pd->af);
6019 }
6020 }
6021
6022 return (PF_PASS);
6023 }
6024
6025 static void
pf_sctp_multihome_detach_addr(const struct pf_kstate * s)6026 pf_sctp_multihome_detach_addr(const struct pf_kstate *s)
6027 {
6028 struct pf_sctp_endpoint key;
6029 struct pf_sctp_endpoint *ep;
6030 struct pf_state_key *sks = s->key[PF_SK_STACK];
6031 struct pf_sctp_source *i, *tmp;
6032
6033 if (sks == NULL || sks->proto != IPPROTO_SCTP || s->dst.scrub == NULL)
6034 return;
6035
6036 PF_SCTP_ENDPOINTS_LOCK();
6037
6038 key.v_tag = s->dst.scrub->pfss_v_tag;
6039 ep = RB_FIND(pf_sctp_endpoints, &V_pf_sctp_endpoints, &key);
6040 if (ep != NULL) {
6041 TAILQ_FOREACH_SAFE(i, &ep->sources, entry, tmp) {
6042 if (pf_addr_cmp(&i->addr,
6043 &s->key[PF_SK_WIRE]->addr[s->direction == PF_OUT],
6044 s->key[PF_SK_WIRE]->af) == 0) {
6045 SDT_PROBE3(pf, sctp, multihome, remove,
6046 key.v_tag, s, i);
6047 TAILQ_REMOVE(&ep->sources, i, entry);
6048 free(i, M_PFTEMP);
6049 break;
6050 }
6051 }
6052
6053 if (TAILQ_EMPTY(&ep->sources)) {
6054 RB_REMOVE(pf_sctp_endpoints, &V_pf_sctp_endpoints, ep);
6055 free(ep, M_PFTEMP);
6056 }
6057 }
6058
6059 /* Other direction. */
6060 key.v_tag = s->src.scrub->pfss_v_tag;
6061 ep = RB_FIND(pf_sctp_endpoints, &V_pf_sctp_endpoints, &key);
6062 if (ep != NULL) {
6063 TAILQ_FOREACH_SAFE(i, &ep->sources, entry, tmp) {
6064 if (pf_addr_cmp(&i->addr,
6065 &s->key[PF_SK_WIRE]->addr[s->direction == PF_IN],
6066 s->key[PF_SK_WIRE]->af) == 0) {
6067 SDT_PROBE3(pf, sctp, multihome, remove,
6068 key.v_tag, s, i);
6069 TAILQ_REMOVE(&ep->sources, i, entry);
6070 free(i, M_PFTEMP);
6071 break;
6072 }
6073 }
6074
6075 if (TAILQ_EMPTY(&ep->sources)) {
6076 RB_REMOVE(pf_sctp_endpoints, &V_pf_sctp_endpoints, ep);
6077 free(ep, M_PFTEMP);
6078 }
6079 }
6080
6081 PF_SCTP_ENDPOINTS_UNLOCK();
6082 }
6083
6084 static void
pf_sctp_multihome_add_addr(struct pf_pdesc * pd,struct pf_addr * a,uint32_t v_tag)6085 pf_sctp_multihome_add_addr(struct pf_pdesc *pd, struct pf_addr *a, uint32_t v_tag)
6086 {
6087 struct pf_sctp_endpoint key = {
6088 .v_tag = v_tag,
6089 };
6090 struct pf_sctp_source *i;
6091 struct pf_sctp_endpoint *ep;
6092
6093 PF_SCTP_ENDPOINTS_LOCK();
6094
6095 ep = RB_FIND(pf_sctp_endpoints, &V_pf_sctp_endpoints, &key);
6096 if (ep == NULL) {
6097 ep = malloc(sizeof(struct pf_sctp_endpoint),
6098 M_PFTEMP, M_NOWAIT);
6099 if (ep == NULL) {
6100 PF_SCTP_ENDPOINTS_UNLOCK();
6101 return;
6102 }
6103
6104 ep->v_tag = v_tag;
6105 TAILQ_INIT(&ep->sources);
6106 RB_INSERT(pf_sctp_endpoints, &V_pf_sctp_endpoints, ep);
6107 }
6108
6109 /* Avoid inserting duplicates. */
6110 TAILQ_FOREACH(i, &ep->sources, entry) {
6111 if (pf_addr_cmp(&i->addr, a, pd->af) == 0) {
6112 PF_SCTP_ENDPOINTS_UNLOCK();
6113 return;
6114 }
6115 }
6116
6117 i = malloc(sizeof(*i), M_PFTEMP, M_NOWAIT);
6118 if (i == NULL) {
6119 PF_SCTP_ENDPOINTS_UNLOCK();
6120 return;
6121 }
6122
6123 i->af = pd->af;
6124 memcpy(&i->addr, a, sizeof(*a));
6125 TAILQ_INSERT_TAIL(&ep->sources, i, entry);
6126 SDT_PROBE2(pf, sctp, multihome, add, v_tag, i);
6127
6128 PF_SCTP_ENDPOINTS_UNLOCK();
6129 }
6130
6131 static void
pf_sctp_multihome_delayed(struct pf_pdesc * pd,int off,struct pfi_kkif * kif,struct pf_kstate * s,int action)6132 pf_sctp_multihome_delayed(struct pf_pdesc *pd, int off, struct pfi_kkif *kif,
6133 struct pf_kstate *s, int action)
6134 {
6135 struct pf_sctp_multihome_job *j, *tmp;
6136 struct pf_sctp_source *i;
6137 int ret __unused;
6138 struct pf_kstate *sm = NULL;
6139 struct pf_krule *ra = NULL;
6140 struct pf_krule *r = &V_pf_default_rule;
6141 struct pf_kruleset *rs = NULL;
6142 bool do_extra = true;
6143
6144 PF_RULES_RLOCK_TRACKER;
6145
6146 again:
6147 TAILQ_FOREACH_SAFE(j, &pd->sctp_multihome_jobs, next, tmp) {
6148 if (s == NULL || action != PF_PASS)
6149 goto free;
6150
6151 /* Confirm we don't recurse here. */
6152 MPASS(! (pd->sctp_flags & PFDESC_SCTP_ADD_IP));
6153
6154 switch (j->op) {
6155 case SCTP_ADD_IP_ADDRESS: {
6156 uint32_t v_tag = pd->sctp_initiate_tag;
6157
6158 if (v_tag == 0) {
6159 if (s->direction == pd->dir)
6160 v_tag = s->src.scrub->pfss_v_tag;
6161 else
6162 v_tag = s->dst.scrub->pfss_v_tag;
6163 }
6164
6165 /*
6166 * Avoid duplicating states. We'll already have
6167 * created a state based on the source address of
6168 * the packet, but SCTP endpoints may also list this
6169 * address again in the INIT(_ACK) parameters.
6170 */
6171 if (pf_addr_cmp(&j->src, pd->src, pd->af) == 0) {
6172 break;
6173 }
6174
6175 j->pd.sctp_flags |= PFDESC_SCTP_ADD_IP;
6176 PF_RULES_RLOCK();
6177 sm = NULL;
6178 /*
6179 * New connections need to be floating, because
6180 * we cannot know what interfaces it will use.
6181 * That's why we pass V_pfi_all rather than kif.
6182 */
6183 ret = pf_test_rule(&r, &sm, V_pfi_all,
6184 j->m, off, &j->pd, &ra, &rs, NULL);
6185 PF_RULES_RUNLOCK();
6186 SDT_PROBE4(pf, sctp, multihome, test, kif, r, j->m, ret);
6187 if (ret != PF_DROP && sm != NULL) {
6188 /* Inherit v_tag values. */
6189 if (sm->direction == s->direction) {
6190 sm->src.scrub->pfss_v_tag = s->src.scrub->pfss_v_tag;
6191 sm->dst.scrub->pfss_v_tag = s->dst.scrub->pfss_v_tag;
6192 } else {
6193 sm->src.scrub->pfss_v_tag = s->dst.scrub->pfss_v_tag;
6194 sm->dst.scrub->pfss_v_tag = s->src.scrub->pfss_v_tag;
6195 }
6196 PF_STATE_UNLOCK(sm);
6197 } else {
6198 /* If we try duplicate inserts? */
6199 break;
6200 }
6201
6202 /* Only add the address if we've actually allowed the state. */
6203 pf_sctp_multihome_add_addr(pd, &j->src, v_tag);
6204
6205 if (! do_extra) {
6206 break;
6207 }
6208 /*
6209 * We need to do this for each of our source addresses.
6210 * Find those based on the verification tag.
6211 */
6212 struct pf_sctp_endpoint key = {
6213 .v_tag = pd->hdr.sctp.v_tag,
6214 };
6215 struct pf_sctp_endpoint *ep;
6216
6217 PF_SCTP_ENDPOINTS_LOCK();
6218 ep = RB_FIND(pf_sctp_endpoints, &V_pf_sctp_endpoints, &key);
6219 if (ep == NULL) {
6220 PF_SCTP_ENDPOINTS_UNLOCK();
6221 break;
6222 }
6223 MPASS(ep != NULL);
6224
6225 TAILQ_FOREACH(i, &ep->sources, entry) {
6226 struct pf_sctp_multihome_job *nj;
6227
6228 /* SCTP can intermingle IPv4 and IPv6. */
6229 if (i->af != pd->af)
6230 continue;
6231
6232 nj = malloc(sizeof(*nj), M_PFTEMP, M_NOWAIT | M_ZERO);
6233 if (! nj) {
6234 continue;
6235 }
6236 memcpy(&nj->pd, &j->pd, sizeof(j->pd));
6237 memcpy(&nj->src, &j->src, sizeof(nj->src));
6238 nj->pd.src = &nj->src;
6239 // New destination address!
6240 memcpy(&nj->dst, &i->addr, sizeof(nj->dst));
6241 nj->pd.dst = &nj->dst;
6242 nj->m = j->m;
6243 nj->op = j->op;
6244
6245 TAILQ_INSERT_TAIL(&pd->sctp_multihome_jobs, nj, next);
6246 }
6247 PF_SCTP_ENDPOINTS_UNLOCK();
6248
6249 break;
6250 }
6251 case SCTP_DEL_IP_ADDRESS: {
6252 struct pf_state_key_cmp key;
6253 uint8_t psrc;
6254
6255 bzero(&key, sizeof(key));
6256 key.af = j->pd.af;
6257 key.proto = IPPROTO_SCTP;
6258 if (j->pd.dir == PF_IN) { /* wire side, straight */
6259 PF_ACPY(&key.addr[0], j->pd.src, key.af);
6260 PF_ACPY(&key.addr[1], j->pd.dst, key.af);
6261 key.port[0] = j->pd.hdr.sctp.src_port;
6262 key.port[1] = j->pd.hdr.sctp.dest_port;
6263 } else { /* stack side, reverse */
6264 PF_ACPY(&key.addr[1], j->pd.src, key.af);
6265 PF_ACPY(&key.addr[0], j->pd.dst, key.af);
6266 key.port[1] = j->pd.hdr.sctp.src_port;
6267 key.port[0] = j->pd.hdr.sctp.dest_port;
6268 }
6269
6270 sm = pf_find_state(kif, &key, j->pd.dir);
6271 if (sm != NULL) {
6272 PF_STATE_LOCK_ASSERT(sm);
6273 if (j->pd.dir == sm->direction) {
6274 psrc = PF_PEER_SRC;
6275 } else {
6276 psrc = PF_PEER_DST;
6277 }
6278 pf_set_protostate(sm, psrc, SCTP_SHUTDOWN_PENDING);
6279 sm->timeout = PFTM_SCTP_CLOSING;
6280 PF_STATE_UNLOCK(sm);
6281 }
6282 break;
6283 default:
6284 panic("Unknown op %#x", j->op);
6285 }
6286 }
6287
6288 free:
6289 TAILQ_REMOVE(&pd->sctp_multihome_jobs, j, next);
6290 free(j, M_PFTEMP);
6291 }
6292
6293 /* We may have inserted extra work while processing the list. */
6294 if (! TAILQ_EMPTY(&pd->sctp_multihome_jobs)) {
6295 do_extra = false;
6296 goto again;
6297 }
6298 }
6299
6300 static int
pf_multihome_scan(struct mbuf * m,int start,int len,struct pf_pdesc * pd,struct pfi_kkif * kif,int op)6301 pf_multihome_scan(struct mbuf *m, int start, int len, struct pf_pdesc *pd,
6302 struct pfi_kkif *kif, int op)
6303 {
6304 int off = 0;
6305 struct pf_sctp_multihome_job *job;
6306
6307 while (off < len) {
6308 struct sctp_paramhdr h;
6309
6310 if (!pf_pull_hdr(m, start + off, &h, sizeof(h), NULL, NULL,
6311 pd->af))
6312 return (PF_DROP);
6313
6314 /* Parameters are at least 4 bytes. */
6315 if (ntohs(h.param_length) < 4)
6316 return (PF_DROP);
6317
6318 switch (ntohs(h.param_type)) {
6319 case SCTP_IPV4_ADDRESS: {
6320 struct in_addr t;
6321
6322 if (ntohs(h.param_length) !=
6323 (sizeof(struct sctp_paramhdr) + sizeof(t)))
6324 return (PF_DROP);
6325
6326 if (!pf_pull_hdr(m, start + off + sizeof(h), &t, sizeof(t),
6327 NULL, NULL, pd->af))
6328 return (PF_DROP);
6329
6330 if (in_nullhost(t))
6331 t.s_addr = pd->src->v4.s_addr;
6332
6333 /*
6334 * We hold the state lock (idhash) here, which means
6335 * that we can't acquire the keyhash, or we'll get a
6336 * LOR (and potentially double-lock things too). We also
6337 * can't release the state lock here, so instead we'll
6338 * enqueue this for async handling.
6339 * There's a relatively small race here, in that a
6340 * packet using the new addresses could arrive already,
6341 * but that's just though luck for it.
6342 */
6343 job = malloc(sizeof(*job), M_PFTEMP, M_NOWAIT | M_ZERO);
6344 if (! job)
6345 return (PF_DROP);
6346
6347 memcpy(&job->pd, pd, sizeof(*pd));
6348
6349 // New source address!
6350 memcpy(&job->src, &t, sizeof(t));
6351 job->pd.src = &job->src;
6352 memcpy(&job->dst, pd->dst, sizeof(job->dst));
6353 job->pd.dst = &job->dst;
6354 job->m = m;
6355 job->op = op;
6356
6357 TAILQ_INSERT_TAIL(&pd->sctp_multihome_jobs, job, next);
6358 break;
6359 }
6360 #ifdef INET6
6361 case SCTP_IPV6_ADDRESS: {
6362 struct in6_addr t;
6363
6364 if (ntohs(h.param_length) !=
6365 (sizeof(struct sctp_paramhdr) + sizeof(t)))
6366 return (PF_DROP);
6367
6368 if (!pf_pull_hdr(m, start + off + sizeof(h), &t, sizeof(t),
6369 NULL, NULL, pd->af))
6370 return (PF_DROP);
6371 if (memcmp(&t, &pd->src->v6, sizeof(t)) == 0)
6372 break;
6373 if (memcmp(&t, &in6addr_any, sizeof(t)) == 0)
6374 memcpy(&t, &pd->src->v6, sizeof(t));
6375
6376 job = malloc(sizeof(*job), M_PFTEMP, M_NOWAIT | M_ZERO);
6377 if (! job)
6378 return (PF_DROP);
6379
6380 memcpy(&job->pd, pd, sizeof(*pd));
6381 memcpy(&job->src, &t, sizeof(t));
6382 job->pd.src = &job->src;
6383 memcpy(&job->dst, pd->dst, sizeof(job->dst));
6384 job->pd.dst = &job->dst;
6385 job->m = m;
6386 job->op = op;
6387
6388 TAILQ_INSERT_TAIL(&pd->sctp_multihome_jobs, job, next);
6389 break;
6390 }
6391 #endif
6392 case SCTP_ADD_IP_ADDRESS: {
6393 int ret;
6394 struct sctp_asconf_paramhdr ah;
6395
6396 if (!pf_pull_hdr(m, start + off, &ah, sizeof(ah),
6397 NULL, NULL, pd->af))
6398 return (PF_DROP);
6399
6400 ret = pf_multihome_scan(m, start + off + sizeof(ah),
6401 ntohs(ah.ph.param_length) - sizeof(ah), pd, kif,
6402 SCTP_ADD_IP_ADDRESS);
6403 if (ret != PF_PASS)
6404 return (ret);
6405 break;
6406 }
6407 case SCTP_DEL_IP_ADDRESS: {
6408 int ret;
6409 struct sctp_asconf_paramhdr ah;
6410
6411 if (!pf_pull_hdr(m, start + off, &ah, sizeof(ah),
6412 NULL, NULL, pd->af))
6413 return (PF_DROP);
6414 ret = pf_multihome_scan(m, start + off + sizeof(ah),
6415 ntohs(ah.ph.param_length) - sizeof(ah), pd, kif,
6416 SCTP_DEL_IP_ADDRESS);
6417 if (ret != PF_PASS)
6418 return (ret);
6419 break;
6420 }
6421 default:
6422 break;
6423 }
6424
6425 off += roundup(ntohs(h.param_length), 4);
6426 }
6427
6428 return (PF_PASS);
6429 }
6430 int
pf_multihome_scan_init(struct mbuf * m,int start,int len,struct pf_pdesc * pd,struct pfi_kkif * kif)6431 pf_multihome_scan_init(struct mbuf *m, int start, int len, struct pf_pdesc *pd,
6432 struct pfi_kkif *kif)
6433 {
6434 start += sizeof(struct sctp_init_chunk);
6435 len -= sizeof(struct sctp_init_chunk);
6436
6437 return (pf_multihome_scan(m, start, len, pd, kif, SCTP_ADD_IP_ADDRESS));
6438 }
6439
6440 int
pf_multihome_scan_asconf(struct mbuf * m,int start,int len,struct pf_pdesc * pd,struct pfi_kkif * kif)6441 pf_multihome_scan_asconf(struct mbuf *m, int start, int len,
6442 struct pf_pdesc *pd, struct pfi_kkif *kif)
6443 {
6444 start += sizeof(struct sctp_asconf_chunk);
6445 len -= sizeof(struct sctp_asconf_chunk);
6446
6447 return (pf_multihome_scan(m, start, len, pd, kif, SCTP_ADD_IP_ADDRESS));
6448 }
6449
6450 static int
pf_test_state_icmp(struct pf_kstate ** state,struct pfi_kkif * kif,struct mbuf * m,int off,void * h,struct pf_pdesc * pd,u_short * reason)6451 pf_test_state_icmp(struct pf_kstate **state, struct pfi_kkif *kif,
6452 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason)
6453 {
6454 struct pf_addr *saddr = pd->src, *daddr = pd->dst;
6455 u_int16_t icmpid = 0, *icmpsum;
6456 u_int8_t icmptype, icmpcode;
6457 int state_icmp = 0;
6458 struct pf_state_key_cmp key;
6459
6460 bzero(&key, sizeof(key));
6461 switch (pd->proto) {
6462 #ifdef INET
6463 case IPPROTO_ICMP:
6464 icmptype = pd->hdr.icmp.icmp_type;
6465 icmpcode = pd->hdr.icmp.icmp_code;
6466 icmpid = pd->hdr.icmp.icmp_id;
6467 icmpsum = &pd->hdr.icmp.icmp_cksum;
6468
6469 if (icmptype == ICMP_UNREACH ||
6470 icmptype == ICMP_SOURCEQUENCH ||
6471 icmptype == ICMP_REDIRECT ||
6472 icmptype == ICMP_TIMXCEED ||
6473 icmptype == ICMP_PARAMPROB)
6474 state_icmp++;
6475 break;
6476 #endif /* INET */
6477 #ifdef INET6
6478 case IPPROTO_ICMPV6:
6479 icmptype = pd->hdr.icmp6.icmp6_type;
6480 icmpcode = pd->hdr.icmp6.icmp6_code;
6481 icmpid = pd->hdr.icmp6.icmp6_id;
6482 icmpsum = &pd->hdr.icmp6.icmp6_cksum;
6483
6484 if (icmptype == ICMP6_DST_UNREACH ||
6485 icmptype == ICMP6_PACKET_TOO_BIG ||
6486 icmptype == ICMP6_TIME_EXCEEDED ||
6487 icmptype == ICMP6_PARAM_PROB)
6488 state_icmp++;
6489 break;
6490 #endif /* INET6 */
6491 }
6492
6493 if (!state_icmp) {
6494 /*
6495 * ICMP query/reply message not related to a TCP/UDP packet.
6496 * Search for an ICMP state.
6497 */
6498 key.af = pd->af;
6499 key.proto = pd->proto;
6500 key.port[0] = key.port[1] = icmpid;
6501 if (pd->dir == PF_IN) { /* wire side, straight */
6502 PF_ACPY(&key.addr[0], pd->src, key.af);
6503 PF_ACPY(&key.addr[1], pd->dst, key.af);
6504 } else { /* stack side, reverse */
6505 PF_ACPY(&key.addr[1], pd->src, key.af);
6506 PF_ACPY(&key.addr[0], pd->dst, key.af);
6507 }
6508
6509 STATE_LOOKUP(kif, &key, *state, pd);
6510
6511 (*state)->expire = pf_get_uptime();
6512 (*state)->timeout = PFTM_ICMP_ERROR_REPLY;
6513
6514 /* translate source/destination address, if necessary */
6515 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
6516 struct pf_state_key *nk = (*state)->key[pd->didx];
6517
6518 switch (pd->af) {
6519 #ifdef INET
6520 case AF_INET:
6521 if (PF_ANEQ(pd->src,
6522 &nk->addr[pd->sidx], AF_INET))
6523 pf_change_a(&saddr->v4.s_addr,
6524 pd->ip_sum,
6525 nk->addr[pd->sidx].v4.s_addr, 0);
6526
6527 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx],
6528 AF_INET))
6529 pf_change_a(&daddr->v4.s_addr,
6530 pd->ip_sum,
6531 nk->addr[pd->didx].v4.s_addr, 0);
6532
6533 if (nk->port[0] !=
6534 pd->hdr.icmp.icmp_id) {
6535 pd->hdr.icmp.icmp_cksum =
6536 pf_cksum_fixup(
6537 pd->hdr.icmp.icmp_cksum, icmpid,
6538 nk->port[pd->sidx], 0);
6539 pd->hdr.icmp.icmp_id =
6540 nk->port[pd->sidx];
6541 }
6542
6543 m_copyback(m, off, ICMP_MINLEN,
6544 (caddr_t )&pd->hdr.icmp);
6545 break;
6546 #endif /* INET */
6547 #ifdef INET6
6548 case AF_INET6:
6549 if (PF_ANEQ(pd->src,
6550 &nk->addr[pd->sidx], AF_INET6))
6551 pf_change_a6(saddr,
6552 &pd->hdr.icmp6.icmp6_cksum,
6553 &nk->addr[pd->sidx], 0);
6554
6555 if (PF_ANEQ(pd->dst,
6556 &nk->addr[pd->didx], AF_INET6))
6557 pf_change_a6(daddr,
6558 &pd->hdr.icmp6.icmp6_cksum,
6559 &nk->addr[pd->didx], 0);
6560
6561 m_copyback(m, off, sizeof(struct icmp6_hdr),
6562 (caddr_t )&pd->hdr.icmp6);
6563 break;
6564 #endif /* INET6 */
6565 }
6566 }
6567 return (PF_PASS);
6568
6569 } else {
6570 /*
6571 * ICMP error message in response to a TCP/UDP packet.
6572 * Extract the inner TCP/UDP header and search for that state.
6573 */
6574
6575 struct pf_pdesc pd2;
6576 bzero(&pd2, sizeof pd2);
6577 #ifdef INET
6578 struct ip h2;
6579 #endif /* INET */
6580 #ifdef INET6
6581 struct ip6_hdr h2_6;
6582 int terminal = 0;
6583 #endif /* INET6 */
6584 int ipoff2 = 0;
6585 int off2 = 0;
6586
6587 pd2.af = pd->af;
6588 /* Payload packet is from the opposite direction. */
6589 pd2.sidx = (pd->dir == PF_IN) ? 1 : 0;
6590 pd2.didx = (pd->dir == PF_IN) ? 0 : 1;
6591 switch (pd->af) {
6592 #ifdef INET
6593 case AF_INET:
6594 /* offset of h2 in mbuf chain */
6595 ipoff2 = off + ICMP_MINLEN;
6596
6597 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
6598 NULL, reason, pd2.af)) {
6599 DPFPRINTF(PF_DEBUG_MISC,
6600 ("pf: ICMP error message too short "
6601 "(ip)\n"));
6602 return (PF_DROP);
6603 }
6604 /*
6605 * ICMP error messages don't refer to non-first
6606 * fragments
6607 */
6608 if (h2.ip_off & htons(IP_OFFMASK)) {
6609 REASON_SET(reason, PFRES_FRAG);
6610 return (PF_DROP);
6611 }
6612
6613 /* offset of protocol header that follows h2 */
6614 off2 = ipoff2 + (h2.ip_hl << 2);
6615
6616 pd2.proto = h2.ip_p;
6617 pd2.src = (struct pf_addr *)&h2.ip_src;
6618 pd2.dst = (struct pf_addr *)&h2.ip_dst;
6619 pd2.ip_sum = &h2.ip_sum;
6620 break;
6621 #endif /* INET */
6622 #ifdef INET6
6623 case AF_INET6:
6624 ipoff2 = off + sizeof(struct icmp6_hdr);
6625
6626 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
6627 NULL, reason, pd2.af)) {
6628 DPFPRINTF(PF_DEBUG_MISC,
6629 ("pf: ICMP error message too short "
6630 "(ip6)\n"));
6631 return (PF_DROP);
6632 }
6633 pd2.proto = h2_6.ip6_nxt;
6634 pd2.src = (struct pf_addr *)&h2_6.ip6_src;
6635 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
6636 pd2.ip_sum = NULL;
6637 off2 = ipoff2 + sizeof(h2_6);
6638 do {
6639 switch (pd2.proto) {
6640 case IPPROTO_FRAGMENT:
6641 /*
6642 * ICMPv6 error messages for
6643 * non-first fragments
6644 */
6645 REASON_SET(reason, PFRES_FRAG);
6646 return (PF_DROP);
6647 case IPPROTO_AH:
6648 case IPPROTO_HOPOPTS:
6649 case IPPROTO_ROUTING:
6650 case IPPROTO_DSTOPTS: {
6651 /* get next header and header length */
6652 struct ip6_ext opt6;
6653
6654 if (!pf_pull_hdr(m, off2, &opt6,
6655 sizeof(opt6), NULL, reason,
6656 pd2.af)) {
6657 DPFPRINTF(PF_DEBUG_MISC,
6658 ("pf: ICMPv6 short opt\n"));
6659 return (PF_DROP);
6660 }
6661 if (pd2.proto == IPPROTO_AH)
6662 off2 += (opt6.ip6e_len + 2) * 4;
6663 else
6664 off2 += (opt6.ip6e_len + 1) * 8;
6665 pd2.proto = opt6.ip6e_nxt;
6666 /* goto the next header */
6667 break;
6668 }
6669 default:
6670 terminal++;
6671 break;
6672 }
6673 } while (!terminal);
6674 break;
6675 #endif /* INET6 */
6676 }
6677
6678 if (PF_ANEQ(pd->dst, pd2.src, pd->af)) {
6679 if (V_pf_status.debug >= PF_DEBUG_MISC) {
6680 printf("pf: BAD ICMP %d:%d outer dst: ",
6681 icmptype, icmpcode);
6682 pf_print_host(pd->src, 0, pd->af);
6683 printf(" -> ");
6684 pf_print_host(pd->dst, 0, pd->af);
6685 printf(" inner src: ");
6686 pf_print_host(pd2.src, 0, pd2.af);
6687 printf(" -> ");
6688 pf_print_host(pd2.dst, 0, pd2.af);
6689 printf("\n");
6690 }
6691 REASON_SET(reason, PFRES_BADSTATE);
6692 return (PF_DROP);
6693 }
6694
6695 switch (pd2.proto) {
6696 case IPPROTO_TCP: {
6697 struct tcphdr th;
6698 u_int32_t seq;
6699 struct pf_state_peer *src, *dst;
6700 u_int8_t dws;
6701 int copyback = 0;
6702
6703 /*
6704 * Only the first 8 bytes of the TCP header can be
6705 * expected. Don't access any TCP header fields after
6706 * th_seq, an ackskew test is not possible.
6707 */
6708 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason,
6709 pd2.af)) {
6710 DPFPRINTF(PF_DEBUG_MISC,
6711 ("pf: ICMP error message too short "
6712 "(tcp)\n"));
6713 return (PF_DROP);
6714 }
6715
6716 key.af = pd2.af;
6717 key.proto = IPPROTO_TCP;
6718 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
6719 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
6720 key.port[pd2.sidx] = th.th_sport;
6721 key.port[pd2.didx] = th.th_dport;
6722
6723 STATE_LOOKUP(kif, &key, *state, pd);
6724
6725 if (pd->dir == (*state)->direction) {
6726 src = &(*state)->dst;
6727 dst = &(*state)->src;
6728 } else {
6729 src = &(*state)->src;
6730 dst = &(*state)->dst;
6731 }
6732
6733 if (src->wscale && dst->wscale)
6734 dws = dst->wscale & PF_WSCALE_MASK;
6735 else
6736 dws = 0;
6737
6738 /* Demodulate sequence number */
6739 seq = ntohl(th.th_seq) - src->seqdiff;
6740 if (src->seqdiff) {
6741 pf_change_a(&th.th_seq, icmpsum,
6742 htonl(seq), 0);
6743 copyback = 1;
6744 }
6745
6746 if (!((*state)->state_flags & PFSTATE_SLOPPY) &&
6747 (!SEQ_GEQ(src->seqhi, seq) ||
6748 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) {
6749 if (V_pf_status.debug >= PF_DEBUG_MISC) {
6750 printf("pf: BAD ICMP %d:%d ",
6751 icmptype, icmpcode);
6752 pf_print_host(pd->src, 0, pd->af);
6753 printf(" -> ");
6754 pf_print_host(pd->dst, 0, pd->af);
6755 printf(" state: ");
6756 pf_print_state(*state);
6757 printf(" seq=%u\n", seq);
6758 }
6759 REASON_SET(reason, PFRES_BADSTATE);
6760 return (PF_DROP);
6761 } else {
6762 if (V_pf_status.debug >= PF_DEBUG_MISC) {
6763 printf("pf: OK ICMP %d:%d ",
6764 icmptype, icmpcode);
6765 pf_print_host(pd->src, 0, pd->af);
6766 printf(" -> ");
6767 pf_print_host(pd->dst, 0, pd->af);
6768 printf(" state: ");
6769 pf_print_state(*state);
6770 printf(" seq=%u\n", seq);
6771 }
6772 }
6773
6774 /* translate source/destination address, if necessary */
6775 if ((*state)->key[PF_SK_WIRE] !=
6776 (*state)->key[PF_SK_STACK]) {
6777 struct pf_state_key *nk =
6778 (*state)->key[pd->didx];
6779
6780 if (PF_ANEQ(pd2.src,
6781 &nk->addr[pd2.sidx], pd2.af) ||
6782 nk->port[pd2.sidx] != th.th_sport)
6783 pf_change_icmp(pd2.src, &th.th_sport,
6784 daddr, &nk->addr[pd2.sidx],
6785 nk->port[pd2.sidx], NULL,
6786 pd2.ip_sum, icmpsum,
6787 pd->ip_sum, 0, pd2.af);
6788
6789 if (PF_ANEQ(pd2.dst,
6790 &nk->addr[pd2.didx], pd2.af) ||
6791 nk->port[pd2.didx] != th.th_dport)
6792 pf_change_icmp(pd2.dst, &th.th_dport,
6793 saddr, &nk->addr[pd2.didx],
6794 nk->port[pd2.didx], NULL,
6795 pd2.ip_sum, icmpsum,
6796 pd->ip_sum, 0, pd2.af);
6797 copyback = 1;
6798 }
6799
6800 if (copyback) {
6801 switch (pd2.af) {
6802 #ifdef INET
6803 case AF_INET:
6804 m_copyback(m, off, ICMP_MINLEN,
6805 (caddr_t )&pd->hdr.icmp);
6806 m_copyback(m, ipoff2, sizeof(h2),
6807 (caddr_t )&h2);
6808 break;
6809 #endif /* INET */
6810 #ifdef INET6
6811 case AF_INET6:
6812 m_copyback(m, off,
6813 sizeof(struct icmp6_hdr),
6814 (caddr_t )&pd->hdr.icmp6);
6815 m_copyback(m, ipoff2, sizeof(h2_6),
6816 (caddr_t )&h2_6);
6817 break;
6818 #endif /* INET6 */
6819 }
6820 m_copyback(m, off2, 8, (caddr_t)&th);
6821 }
6822
6823 return (PF_PASS);
6824 break;
6825 }
6826 case IPPROTO_UDP: {
6827 struct udphdr uh;
6828
6829 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
6830 NULL, reason, pd2.af)) {
6831 DPFPRINTF(PF_DEBUG_MISC,
6832 ("pf: ICMP error message too short "
6833 "(udp)\n"));
6834 return (PF_DROP);
6835 }
6836
6837 key.af = pd2.af;
6838 key.proto = IPPROTO_UDP;
6839 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
6840 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
6841 key.port[pd2.sidx] = uh.uh_sport;
6842 key.port[pd2.didx] = uh.uh_dport;
6843
6844 STATE_LOOKUP(kif, &key, *state, pd);
6845
6846 /* translate source/destination address, if necessary */
6847 if ((*state)->key[PF_SK_WIRE] !=
6848 (*state)->key[PF_SK_STACK]) {
6849 struct pf_state_key *nk =
6850 (*state)->key[pd->didx];
6851
6852 if (PF_ANEQ(pd2.src,
6853 &nk->addr[pd2.sidx], pd2.af) ||
6854 nk->port[pd2.sidx] != uh.uh_sport)
6855 pf_change_icmp(pd2.src, &uh.uh_sport,
6856 daddr, &nk->addr[pd2.sidx],
6857 nk->port[pd2.sidx], &uh.uh_sum,
6858 pd2.ip_sum, icmpsum,
6859 pd->ip_sum, 1, pd2.af);
6860
6861 if (PF_ANEQ(pd2.dst,
6862 &nk->addr[pd2.didx], pd2.af) ||
6863 nk->port[pd2.didx] != uh.uh_dport)
6864 pf_change_icmp(pd2.dst, &uh.uh_dport,
6865 saddr, &nk->addr[pd2.didx],
6866 nk->port[pd2.didx], &uh.uh_sum,
6867 pd2.ip_sum, icmpsum,
6868 pd->ip_sum, 1, pd2.af);
6869
6870 switch (pd2.af) {
6871 #ifdef INET
6872 case AF_INET:
6873 m_copyback(m, off, ICMP_MINLEN,
6874 (caddr_t )&pd->hdr.icmp);
6875 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
6876 break;
6877 #endif /* INET */
6878 #ifdef INET6
6879 case AF_INET6:
6880 m_copyback(m, off,
6881 sizeof(struct icmp6_hdr),
6882 (caddr_t )&pd->hdr.icmp6);
6883 m_copyback(m, ipoff2, sizeof(h2_6),
6884 (caddr_t )&h2_6);
6885 break;
6886 #endif /* INET6 */
6887 }
6888 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh);
6889 }
6890 return (PF_PASS);
6891 break;
6892 }
6893 #ifdef INET
6894 case IPPROTO_ICMP: {
6895 struct icmp iih;
6896
6897 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
6898 NULL, reason, pd2.af)) {
6899 DPFPRINTF(PF_DEBUG_MISC,
6900 ("pf: ICMP error message too short i"
6901 "(icmp)\n"));
6902 return (PF_DROP);
6903 }
6904
6905 key.af = pd2.af;
6906 key.proto = IPPROTO_ICMP;
6907 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
6908 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
6909 key.port[0] = key.port[1] = iih.icmp_id;
6910
6911 STATE_LOOKUP(kif, &key, *state, pd);
6912
6913 /* translate source/destination address, if necessary */
6914 if ((*state)->key[PF_SK_WIRE] !=
6915 (*state)->key[PF_SK_STACK]) {
6916 struct pf_state_key *nk =
6917 (*state)->key[pd->didx];
6918
6919 if (PF_ANEQ(pd2.src,
6920 &nk->addr[pd2.sidx], pd2.af) ||
6921 nk->port[pd2.sidx] != iih.icmp_id)
6922 pf_change_icmp(pd2.src, &iih.icmp_id,
6923 daddr, &nk->addr[pd2.sidx],
6924 nk->port[pd2.sidx], NULL,
6925 pd2.ip_sum, icmpsum,
6926 pd->ip_sum, 0, AF_INET);
6927
6928 if (PF_ANEQ(pd2.dst,
6929 &nk->addr[pd2.didx], pd2.af) ||
6930 nk->port[pd2.didx] != iih.icmp_id)
6931 pf_change_icmp(pd2.dst, &iih.icmp_id,
6932 saddr, &nk->addr[pd2.didx],
6933 nk->port[pd2.didx], NULL,
6934 pd2.ip_sum, icmpsum,
6935 pd->ip_sum, 0, AF_INET);
6936
6937 m_copyback(m, off, ICMP_MINLEN, (caddr_t)&pd->hdr.icmp);
6938 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
6939 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih);
6940 }
6941 return (PF_PASS);
6942 break;
6943 }
6944 #endif /* INET */
6945 #ifdef INET6
6946 case IPPROTO_ICMPV6: {
6947 struct icmp6_hdr iih;
6948
6949 if (!pf_pull_hdr(m, off2, &iih,
6950 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) {
6951 DPFPRINTF(PF_DEBUG_MISC,
6952 ("pf: ICMP error message too short "
6953 "(icmp6)\n"));
6954 return (PF_DROP);
6955 }
6956
6957 key.af = pd2.af;
6958 key.proto = IPPROTO_ICMPV6;
6959 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
6960 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
6961 key.port[0] = key.port[1] = iih.icmp6_id;
6962
6963 STATE_LOOKUP(kif, &key, *state, pd);
6964
6965 /* translate source/destination address, if necessary */
6966 if ((*state)->key[PF_SK_WIRE] !=
6967 (*state)->key[PF_SK_STACK]) {
6968 struct pf_state_key *nk =
6969 (*state)->key[pd->didx];
6970
6971 if (PF_ANEQ(pd2.src,
6972 &nk->addr[pd2.sidx], pd2.af) ||
6973 nk->port[pd2.sidx] != iih.icmp6_id)
6974 pf_change_icmp(pd2.src, &iih.icmp6_id,
6975 daddr, &nk->addr[pd2.sidx],
6976 nk->port[pd2.sidx], NULL,
6977 pd2.ip_sum, icmpsum,
6978 pd->ip_sum, 0, AF_INET6);
6979
6980 if (PF_ANEQ(pd2.dst,
6981 &nk->addr[pd2.didx], pd2.af) ||
6982 nk->port[pd2.didx] != iih.icmp6_id)
6983 pf_change_icmp(pd2.dst, &iih.icmp6_id,
6984 saddr, &nk->addr[pd2.didx],
6985 nk->port[pd2.didx], NULL,
6986 pd2.ip_sum, icmpsum,
6987 pd->ip_sum, 0, AF_INET6);
6988
6989 m_copyback(m, off, sizeof(struct icmp6_hdr),
6990 (caddr_t)&pd->hdr.icmp6);
6991 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6);
6992 m_copyback(m, off2, sizeof(struct icmp6_hdr),
6993 (caddr_t)&iih);
6994 }
6995 return (PF_PASS);
6996 break;
6997 }
6998 #endif /* INET6 */
6999 default: {
7000 key.af = pd2.af;
7001 key.proto = pd2.proto;
7002 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
7003 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
7004 key.port[0] = key.port[1] = 0;
7005
7006 STATE_LOOKUP(kif, &key, *state, pd);
7007
7008 /* translate source/destination address, if necessary */
7009 if ((*state)->key[PF_SK_WIRE] !=
7010 (*state)->key[PF_SK_STACK]) {
7011 struct pf_state_key *nk =
7012 (*state)->key[pd->didx];
7013
7014 if (PF_ANEQ(pd2.src,
7015 &nk->addr[pd2.sidx], pd2.af))
7016 pf_change_icmp(pd2.src, NULL, daddr,
7017 &nk->addr[pd2.sidx], 0, NULL,
7018 pd2.ip_sum, icmpsum,
7019 pd->ip_sum, 0, pd2.af);
7020
7021 if (PF_ANEQ(pd2.dst,
7022 &nk->addr[pd2.didx], pd2.af))
7023 pf_change_icmp(pd2.dst, NULL, saddr,
7024 &nk->addr[pd2.didx], 0, NULL,
7025 pd2.ip_sum, icmpsum,
7026 pd->ip_sum, 0, pd2.af);
7027
7028 switch (pd2.af) {
7029 #ifdef INET
7030 case AF_INET:
7031 m_copyback(m, off, ICMP_MINLEN,
7032 (caddr_t)&pd->hdr.icmp);
7033 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
7034 break;
7035 #endif /* INET */
7036 #ifdef INET6
7037 case AF_INET6:
7038 m_copyback(m, off,
7039 sizeof(struct icmp6_hdr),
7040 (caddr_t )&pd->hdr.icmp6);
7041 m_copyback(m, ipoff2, sizeof(h2_6),
7042 (caddr_t )&h2_6);
7043 break;
7044 #endif /* INET6 */
7045 }
7046 }
7047 return (PF_PASS);
7048 break;
7049 }
7050 }
7051 }
7052 }
7053
7054 static int
pf_test_state_other(struct pf_kstate ** state,struct pfi_kkif * kif,struct mbuf * m,struct pf_pdesc * pd)7055 pf_test_state_other(struct pf_kstate **state, struct pfi_kkif *kif,
7056 struct mbuf *m, struct pf_pdesc *pd)
7057 {
7058 struct pf_state_peer *src, *dst;
7059 struct pf_state_key_cmp key;
7060 uint8_t psrc, pdst;
7061
7062 bzero(&key, sizeof(key));
7063 key.af = pd->af;
7064 key.proto = pd->proto;
7065 if (pd->dir == PF_IN) {
7066 PF_ACPY(&key.addr[0], pd->src, key.af);
7067 PF_ACPY(&key.addr[1], pd->dst, key.af);
7068 key.port[0] = key.port[1] = 0;
7069 } else {
7070 PF_ACPY(&key.addr[1], pd->src, key.af);
7071 PF_ACPY(&key.addr[0], pd->dst, key.af);
7072 key.port[1] = key.port[0] = 0;
7073 }
7074
7075 STATE_LOOKUP(kif, &key, *state, pd);
7076
7077 if (pd->dir == (*state)->direction) {
7078 src = &(*state)->src;
7079 dst = &(*state)->dst;
7080 psrc = PF_PEER_SRC;
7081 pdst = PF_PEER_DST;
7082 } else {
7083 src = &(*state)->dst;
7084 dst = &(*state)->src;
7085 psrc = PF_PEER_DST;
7086 pdst = PF_PEER_SRC;
7087 }
7088
7089 /* update states */
7090 if (src->state < PFOTHERS_SINGLE)
7091 pf_set_protostate(*state, psrc, PFOTHERS_SINGLE);
7092 if (dst->state == PFOTHERS_SINGLE)
7093 pf_set_protostate(*state, pdst, PFOTHERS_MULTIPLE);
7094
7095 /* update expire time */
7096 (*state)->expire = pf_get_uptime();
7097 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
7098 (*state)->timeout = PFTM_OTHER_MULTIPLE;
7099 else
7100 (*state)->timeout = PFTM_OTHER_SINGLE;
7101
7102 /* translate source/destination address, if necessary */
7103 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
7104 struct pf_state_key *nk = (*state)->key[pd->didx];
7105
7106 KASSERT(nk, ("%s: nk is null", __func__));
7107 KASSERT(pd, ("%s: pd is null", __func__));
7108 KASSERT(pd->src, ("%s: pd->src is null", __func__));
7109 KASSERT(pd->dst, ("%s: pd->dst is null", __func__));
7110 switch (pd->af) {
7111 #ifdef INET
7112 case AF_INET:
7113 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
7114 pf_change_a(&pd->src->v4.s_addr,
7115 pd->ip_sum,
7116 nk->addr[pd->sidx].v4.s_addr,
7117 0);
7118
7119 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
7120 pf_change_a(&pd->dst->v4.s_addr,
7121 pd->ip_sum,
7122 nk->addr[pd->didx].v4.s_addr,
7123 0);
7124
7125 break;
7126 #endif /* INET */
7127 #ifdef INET6
7128 case AF_INET6:
7129 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
7130 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af);
7131
7132 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
7133 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af);
7134 #endif /* INET6 */
7135 }
7136 }
7137 return (PF_PASS);
7138 }
7139
7140 /*
7141 * ipoff and off are measured from the start of the mbuf chain.
7142 * h must be at "ipoff" on the mbuf chain.
7143 */
7144 void *
pf_pull_hdr(struct mbuf * m,int off,void * p,int len,u_short * actionp,u_short * reasonp,sa_family_t af)7145 pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
7146 u_short *actionp, u_short *reasonp, sa_family_t af)
7147 {
7148 switch (af) {
7149 #ifdef INET
7150 case AF_INET: {
7151 struct ip *h = mtod(m, struct ip *);
7152 u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3;
7153
7154 if (fragoff) {
7155 if (fragoff >= len)
7156 ACTION_SET(actionp, PF_PASS);
7157 else {
7158 ACTION_SET(actionp, PF_DROP);
7159 REASON_SET(reasonp, PFRES_FRAG);
7160 }
7161 return (NULL);
7162 }
7163 if (m->m_pkthdr.len < off + len ||
7164 ntohs(h->ip_len) < off + len) {
7165 ACTION_SET(actionp, PF_DROP);
7166 REASON_SET(reasonp, PFRES_SHORT);
7167 return (NULL);
7168 }
7169 break;
7170 }
7171 #endif /* INET */
7172 #ifdef INET6
7173 case AF_INET6: {
7174 struct ip6_hdr *h = mtod(m, struct ip6_hdr *);
7175
7176 if (m->m_pkthdr.len < off + len ||
7177 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
7178 (unsigned)(off + len)) {
7179 ACTION_SET(actionp, PF_DROP);
7180 REASON_SET(reasonp, PFRES_SHORT);
7181 return (NULL);
7182 }
7183 break;
7184 }
7185 #endif /* INET6 */
7186 }
7187 m_copydata(m, off, len, p);
7188 return (p);
7189 }
7190
7191 int
pf_routable(struct pf_addr * addr,sa_family_t af,struct pfi_kkif * kif,int rtableid)7192 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kkif *kif,
7193 int rtableid)
7194 {
7195 struct ifnet *ifp;
7196
7197 /*
7198 * Skip check for addresses with embedded interface scope,
7199 * as they would always match anyway.
7200 */
7201 if (af == AF_INET6 && IN6_IS_SCOPE_EMBED(&addr->v6))
7202 return (1);
7203
7204 if (af != AF_INET && af != AF_INET6)
7205 return (0);
7206
7207 if (kif == V_pfi_all)
7208 return (1);
7209
7210 /* Skip checks for ipsec interfaces */
7211 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
7212 return (1);
7213
7214 ifp = (kif != NULL) ? kif->pfik_ifp : NULL;
7215
7216 switch (af) {
7217 #ifdef INET6
7218 case AF_INET6:
7219 return (fib6_check_urpf(rtableid, &addr->v6, 0, NHR_NONE,
7220 ifp));
7221 #endif
7222 #ifdef INET
7223 case AF_INET:
7224 return (fib4_check_urpf(rtableid, addr->v4, 0, NHR_NONE,
7225 ifp));
7226 #endif
7227 }
7228
7229 return (0);
7230 }
7231
7232 #ifdef INET
7233 static void
pf_route(struct mbuf ** m,struct pf_krule * r,struct ifnet * oifp,struct pf_kstate * s,struct pf_pdesc * pd,struct inpcb * inp)7234 pf_route(struct mbuf **m, struct pf_krule *r, struct ifnet *oifp,
7235 struct pf_kstate *s, struct pf_pdesc *pd, struct inpcb *inp)
7236 {
7237 struct mbuf *m0, *m1, *md;
7238 struct sockaddr_in dst;
7239 struct ip *ip;
7240 struct pfi_kkif *nkif = NULL;
7241 struct ifnet *ifp = NULL;
7242 struct pf_addr naddr;
7243 struct pf_ksrc_node *sn = NULL;
7244 int error = 0;
7245 uint16_t ip_len, ip_off;
7246 uint16_t tmp;
7247 int r_rt, r_dir;
7248
7249 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__));
7250
7251 if (s) {
7252 r_rt = s->rt;
7253 r_dir = s->direction;
7254 } else {
7255 r_rt = r->rt;
7256 r_dir = r->direction;
7257 }
7258
7259 KASSERT(pd->dir == PF_IN || pd->dir == PF_OUT ||
7260 r_dir == PF_IN || r_dir == PF_OUT, ("%s: invalid direction",
7261 __func__));
7262
7263 if ((pd->pf_mtag == NULL &&
7264 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) ||
7265 pd->pf_mtag->routed++ > 3) {
7266 m0 = *m;
7267 *m = NULL;
7268 goto bad_locked;
7269 }
7270
7271 if (r_rt == PF_DUPTO) {
7272 if ((pd->pf_mtag->flags & PF_MTAG_FLAG_DUPLICATED)) {
7273 if (s == NULL) {
7274 ifp = r->rpool.cur->kif ?
7275 r->rpool.cur->kif->pfik_ifp : NULL;
7276 } else {
7277 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
7278 /* If pfsync'd */
7279 if (ifp == NULL && r->rpool.cur != NULL)
7280 ifp = r->rpool.cur->kif ?
7281 r->rpool.cur->kif->pfik_ifp : NULL;
7282 PF_STATE_UNLOCK(s);
7283 }
7284 if (ifp == oifp) {
7285 /* When the 2nd interface is not skipped */
7286 return;
7287 } else {
7288 m0 = *m;
7289 *m = NULL;
7290 goto bad;
7291 }
7292 } else {
7293 pd->pf_mtag->flags |= PF_MTAG_FLAG_DUPLICATED;
7294 if (((m0 = m_dup(*m, M_NOWAIT)) == NULL)) {
7295 if (s)
7296 PF_STATE_UNLOCK(s);
7297 return;
7298 }
7299 }
7300 } else {
7301 if ((r_rt == PF_REPLYTO) == (r_dir == pd->dir)) {
7302 pf_dummynet(pd, s, r, m);
7303 if (s)
7304 PF_STATE_UNLOCK(s);
7305 return;
7306 }
7307 m0 = *m;
7308 }
7309
7310 ip = mtod(m0, struct ip *);
7311
7312 bzero(&dst, sizeof(dst));
7313 dst.sin_family = AF_INET;
7314 dst.sin_len = sizeof(dst);
7315 dst.sin_addr = ip->ip_dst;
7316
7317 bzero(&naddr, sizeof(naddr));
7318
7319 if (s == NULL) {
7320 if (TAILQ_EMPTY(&r->rpool.list)) {
7321 DPFPRINTF(PF_DEBUG_URGENT,
7322 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__));
7323 goto bad_locked;
7324 }
7325 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
7326 &naddr, &nkif, NULL, &sn);
7327 if (!PF_AZERO(&naddr, AF_INET))
7328 dst.sin_addr.s_addr = naddr.v4.s_addr;
7329 ifp = nkif ? nkif->pfik_ifp : NULL;
7330 } else {
7331 struct pfi_kkif *kif;
7332
7333 if (!PF_AZERO(&s->rt_addr, AF_INET))
7334 dst.sin_addr.s_addr =
7335 s->rt_addr.v4.s_addr;
7336 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
7337 kif = s->rt_kif;
7338 /* If pfsync'd */
7339 if (ifp == NULL && r->rpool.cur != NULL) {
7340 ifp = r->rpool.cur->kif ?
7341 r->rpool.cur->kif->pfik_ifp : NULL;
7342 kif = r->rpool.cur->kif;
7343 }
7344 if (ifp != NULL && kif != NULL &&
7345 r->rule_flag & PFRULE_IFBOUND &&
7346 r->rt == PF_REPLYTO &&
7347 s->kif == V_pfi_all) {
7348 s->kif = kif;
7349 s->orig_kif = oifp->if_pf_kif;
7350 }
7351
7352 PF_STATE_UNLOCK(s);
7353 }
7354
7355 if (ifp == NULL)
7356 goto bad;
7357
7358 if (pd->dir == PF_IN) {
7359 if (pf_test(PF_OUT, PFIL_FWD, ifp, &m0, inp, &pd->act) != PF_PASS)
7360 goto bad;
7361 else if (m0 == NULL)
7362 goto done;
7363 if (m0->m_len < sizeof(struct ip)) {
7364 DPFPRINTF(PF_DEBUG_URGENT,
7365 ("%s: m0->m_len < sizeof(struct ip)\n", __func__));
7366 goto bad;
7367 }
7368 ip = mtod(m0, struct ip *);
7369 }
7370
7371 if (ifp->if_flags & IFF_LOOPBACK)
7372 m0->m_flags |= M_SKIP_FIREWALL;
7373
7374 ip_len = ntohs(ip->ip_len);
7375 ip_off = ntohs(ip->ip_off);
7376
7377 /* Copied from FreeBSD 10.0-CURRENT ip_output. */
7378 m0->m_pkthdr.csum_flags |= CSUM_IP;
7379 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) {
7380 in_delayed_cksum(m0);
7381 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
7382 }
7383 if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) {
7384 pf_sctp_checksum(m0, (uint32_t)(ip->ip_hl << 2));
7385 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP;
7386 }
7387
7388 if (pd->dir == PF_IN) {
7389 /*
7390 * Make sure dummynet gets the correct direction, in case it needs to
7391 * re-inject later.
7392 */
7393 pd->dir = PF_OUT;
7394
7395 /*
7396 * The following processing is actually the rest of the inbound processing, even
7397 * though we've marked it as outbound (so we don't look through dummynet) and it
7398 * happens after the outbound processing (pf_test(PF_OUT) above).
7399 * Swap the dummynet pipe numbers, because it's going to come to the wrong
7400 * conclusion about what direction it's processing, and we can't fix it or it
7401 * will re-inject incorrectly. Swapping the pipe numbers means that its incorrect
7402 * decision will pick the right pipe, and everything will mostly work as expected.
7403 */
7404 tmp = pd->act.dnrpipe;
7405 pd->act.dnrpipe = pd->act.dnpipe;
7406 pd->act.dnpipe = tmp;
7407 }
7408
7409 /*
7410 * If small enough for interface, or the interface will take
7411 * care of the fragmentation for us, we can just send directly.
7412 */
7413 if (ip_len <= ifp->if_mtu ||
7414 (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) {
7415 ip->ip_sum = 0;
7416 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) {
7417 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
7418 m0->m_pkthdr.csum_flags &= ~CSUM_IP;
7419 }
7420 m_clrprotoflags(m0); /* Avoid confusing lower layers. */
7421
7422 md = m0;
7423 error = pf_dummynet_route(pd, s, r, ifp, sintosa(&dst), &md);
7424 if (md != NULL)
7425 error = (*ifp->if_output)(ifp, md, sintosa(&dst), NULL);
7426 goto done;
7427 }
7428
7429 /* Balk when DF bit is set or the interface didn't support TSO. */
7430 if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) {
7431 error = EMSGSIZE;
7432 KMOD_IPSTAT_INC(ips_cantfrag);
7433 if (r_rt != PF_DUPTO) {
7434 if (s && pd->nat_rule != NULL)
7435 PACKET_UNDO_NAT(m0, pd,
7436 (ip->ip_hl << 2) + (ip_off & IP_OFFMASK),
7437 s);
7438
7439 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
7440 ifp->if_mtu);
7441 goto done;
7442 } else
7443 goto bad;
7444 }
7445
7446 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist);
7447 if (error)
7448 goto bad;
7449
7450 for (; m0; m0 = m1) {
7451 m1 = m0->m_nextpkt;
7452 m0->m_nextpkt = NULL;
7453 if (error == 0) {
7454 m_clrprotoflags(m0);
7455 md = m0;
7456 pd->pf_mtag = pf_find_mtag(md);
7457 error = pf_dummynet_route(pd, s, r, ifp,
7458 sintosa(&dst), &md);
7459 if (md != NULL)
7460 error = (*ifp->if_output)(ifp, md,
7461 sintosa(&dst), NULL);
7462 } else
7463 m_freem(m0);
7464 }
7465
7466 if (error == 0)
7467 KMOD_IPSTAT_INC(ips_fragmented);
7468
7469 done:
7470 if (r_rt != PF_DUPTO)
7471 *m = NULL;
7472 return;
7473
7474 bad_locked:
7475 if (s)
7476 PF_STATE_UNLOCK(s);
7477 bad:
7478 m_freem(m0);
7479 goto done;
7480 }
7481 #endif /* INET */
7482
7483 #ifdef INET6
7484 static void
pf_route6(struct mbuf ** m,struct pf_krule * r,struct ifnet * oifp,struct pf_kstate * s,struct pf_pdesc * pd,struct inpcb * inp)7485 pf_route6(struct mbuf **m, struct pf_krule *r, struct ifnet *oifp,
7486 struct pf_kstate *s, struct pf_pdesc *pd, struct inpcb *inp)
7487 {
7488 struct mbuf *m0, *md;
7489 struct sockaddr_in6 dst;
7490 struct ip6_hdr *ip6;
7491 struct pfi_kkif *nkif = NULL;
7492 struct ifnet *ifp = NULL;
7493 struct pf_addr naddr;
7494 struct pf_ksrc_node *sn = NULL;
7495 int r_rt, r_dir;
7496
7497 KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__));
7498
7499 if (s) {
7500 r_rt = s->rt;
7501 r_dir = s->direction;
7502 } else {
7503 r_rt = r->rt;
7504 r_dir = r->direction;
7505 }
7506
7507 KASSERT(pd->dir == PF_IN || pd->dir == PF_OUT ||
7508 r_dir == PF_IN || r_dir == PF_OUT, ("%s: invalid direction",
7509 __func__));
7510
7511 if ((pd->pf_mtag == NULL &&
7512 ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) ||
7513 pd->pf_mtag->routed++ > 3) {
7514 m0 = *m;
7515 *m = NULL;
7516 goto bad_locked;
7517 }
7518
7519 if (r_rt == PF_DUPTO) {
7520 if ((pd->pf_mtag->flags & PF_MTAG_FLAG_DUPLICATED)) {
7521 if (s == NULL) {
7522 ifp = r->rpool.cur->kif ?
7523 r->rpool.cur->kif->pfik_ifp : NULL;
7524 } else {
7525 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
7526 /* If pfsync'd */
7527 if (ifp == NULL && r->rpool.cur != NULL)
7528 ifp = r->rpool.cur->kif ?
7529 r->rpool.cur->kif->pfik_ifp : NULL;
7530 PF_STATE_UNLOCK(s);
7531 }
7532 if (ifp == oifp) {
7533 /* When the 2nd interface is not skipped */
7534 return;
7535 } else {
7536 m0 = *m;
7537 *m = NULL;
7538 goto bad;
7539 }
7540 } else {
7541 pd->pf_mtag->flags |= PF_MTAG_FLAG_DUPLICATED;
7542 if (((m0 = m_dup(*m, M_NOWAIT)) == NULL)) {
7543 if (s)
7544 PF_STATE_UNLOCK(s);
7545 return;
7546 }
7547 }
7548 } else {
7549 if ((r_rt == PF_REPLYTO) == (r_dir == pd->dir)) {
7550 pf_dummynet(pd, s, r, m);
7551 if (s)
7552 PF_STATE_UNLOCK(s);
7553 return;
7554 }
7555 m0 = *m;
7556 }
7557
7558 ip6 = mtod(m0, struct ip6_hdr *);
7559
7560 bzero(&dst, sizeof(dst));
7561 dst.sin6_family = AF_INET6;
7562 dst.sin6_len = sizeof(dst);
7563 dst.sin6_addr = ip6->ip6_dst;
7564
7565 bzero(&naddr, sizeof(naddr));
7566
7567 if (s == NULL) {
7568 if (TAILQ_EMPTY(&r->rpool.list)) {
7569 DPFPRINTF(PF_DEBUG_URGENT,
7570 ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__));
7571 goto bad_locked;
7572 }
7573 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
7574 &naddr, &nkif, NULL, &sn);
7575 if (!PF_AZERO(&naddr, AF_INET6))
7576 PF_ACPY((struct pf_addr *)&dst.sin6_addr,
7577 &naddr, AF_INET6);
7578 ifp = nkif ? nkif->pfik_ifp : NULL;
7579 } else {
7580 struct pfi_kkif *kif;
7581
7582 if (!PF_AZERO(&s->rt_addr, AF_INET6))
7583 PF_ACPY((struct pf_addr *)&dst.sin6_addr,
7584 &s->rt_addr, AF_INET6);
7585 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
7586 kif = s->rt_kif;
7587 /* If pfsync'd */
7588 if (ifp == NULL && r->rpool.cur != NULL) {
7589 ifp = r->rpool.cur->kif ?
7590 r->rpool.cur->kif->pfik_ifp : NULL;
7591 kif = r->rpool.cur->kif;
7592 }
7593 if (ifp != NULL && kif != NULL &&
7594 r->rule_flag & PFRULE_IFBOUND &&
7595 r->rt == PF_REPLYTO &&
7596 s->kif == V_pfi_all) {
7597 s->kif = kif;
7598 s->orig_kif = oifp->if_pf_kif;
7599 }
7600 }
7601
7602 if (s)
7603 PF_STATE_UNLOCK(s);
7604
7605 if (ifp == NULL)
7606 goto bad;
7607
7608 if (pd->dir == PF_IN) {
7609 if (pf_test6(PF_OUT, PFIL_FWD, ifp, &m0, inp, &pd->act) != PF_PASS)
7610 goto bad;
7611 else if (m0 == NULL)
7612 goto done;
7613 if (m0->m_len < sizeof(struct ip6_hdr)) {
7614 DPFPRINTF(PF_DEBUG_URGENT,
7615 ("%s: m0->m_len < sizeof(struct ip6_hdr)\n",
7616 __func__));
7617 goto bad;
7618 }
7619 ip6 = mtod(m0, struct ip6_hdr *);
7620 }
7621
7622 if (ifp->if_flags & IFF_LOOPBACK)
7623 m0->m_flags |= M_SKIP_FIREWALL;
7624
7625 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6 &
7626 ~ifp->if_hwassist) {
7627 uint32_t plen = m0->m_pkthdr.len - sizeof(*ip6);
7628 in6_delayed_cksum(m0, plen, sizeof(struct ip6_hdr));
7629 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
7630 }
7631
7632 /*
7633 * If the packet is too large for the outgoing interface,
7634 * send back an icmp6 error.
7635 */
7636 if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr))
7637 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
7638 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) {
7639 md = m0;
7640 pf_dummynet_route(pd, s, r, ifp, sintosa(&dst), &md);
7641 if (md != NULL)
7642 nd6_output_ifp(ifp, ifp, md, &dst, NULL);
7643 }
7644 else {
7645 in6_ifstat_inc(ifp, ifs6_in_toobig);
7646 if (r_rt != PF_DUPTO) {
7647 if (s && pd->nat_rule != NULL)
7648 PACKET_UNDO_NAT(m0, pd,
7649 ((caddr_t)ip6 - m0->m_data) +
7650 sizeof(struct ip6_hdr), s);
7651
7652 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
7653 } else
7654 goto bad;
7655 }
7656
7657 done:
7658 if (r_rt != PF_DUPTO)
7659 *m = NULL;
7660 return;
7661
7662 bad_locked:
7663 if (s)
7664 PF_STATE_UNLOCK(s);
7665 bad:
7666 m_freem(m0);
7667 goto done;
7668 }
7669 #endif /* INET6 */
7670
7671 /*
7672 * FreeBSD supports cksum offloads for the following drivers.
7673 * em(4), fxp(4), lge(4), nge(4), re(4), ti(4), txp(4), xl(4)
7674 *
7675 * CSUM_DATA_VALID | CSUM_PSEUDO_HDR :
7676 * network driver performed cksum including pseudo header, need to verify
7677 * csum_data
7678 * CSUM_DATA_VALID :
7679 * network driver performed cksum, needs to additional pseudo header
7680 * cksum computation with partial csum_data(i.e. lack of H/W support for
7681 * pseudo header, for instance sk(4) and possibly gem(4))
7682 *
7683 * After validating the cksum of packet, set both flag CSUM_DATA_VALID and
7684 * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper
7685 * TCP/UDP layer.
7686 * Also, set csum_data to 0xffff to force cksum validation.
7687 */
7688 static int
pf_check_proto_cksum(struct mbuf * m,int off,int len,u_int8_t p,sa_family_t af)7689 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af)
7690 {
7691 u_int16_t sum = 0;
7692 int hw_assist = 0;
7693 struct ip *ip;
7694
7695 if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
7696 return (1);
7697 if (m->m_pkthdr.len < off + len)
7698 return (1);
7699
7700 switch (p) {
7701 case IPPROTO_TCP:
7702 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
7703 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
7704 sum = m->m_pkthdr.csum_data;
7705 } else {
7706 ip = mtod(m, struct ip *);
7707 sum = in_pseudo(ip->ip_src.s_addr,
7708 ip->ip_dst.s_addr, htonl((u_short)len +
7709 m->m_pkthdr.csum_data + IPPROTO_TCP));
7710 }
7711 sum ^= 0xffff;
7712 ++hw_assist;
7713 }
7714 break;
7715 case IPPROTO_UDP:
7716 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
7717 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
7718 sum = m->m_pkthdr.csum_data;
7719 } else {
7720 ip = mtod(m, struct ip *);
7721 sum = in_pseudo(ip->ip_src.s_addr,
7722 ip->ip_dst.s_addr, htonl((u_short)len +
7723 m->m_pkthdr.csum_data + IPPROTO_UDP));
7724 }
7725 sum ^= 0xffff;
7726 ++hw_assist;
7727 }
7728 break;
7729 case IPPROTO_ICMP:
7730 #ifdef INET6
7731 case IPPROTO_ICMPV6:
7732 #endif /* INET6 */
7733 break;
7734 default:
7735 return (1);
7736 }
7737
7738 if (!hw_assist) {
7739 switch (af) {
7740 case AF_INET:
7741 if (p == IPPROTO_ICMP) {
7742 if (m->m_len < off)
7743 return (1);
7744 m->m_data += off;
7745 m->m_len -= off;
7746 sum = in_cksum(m, len);
7747 m->m_data -= off;
7748 m->m_len += off;
7749 } else {
7750 if (m->m_len < sizeof(struct ip))
7751 return (1);
7752 sum = in4_cksum(m, p, off, len);
7753 }
7754 break;
7755 #ifdef INET6
7756 case AF_INET6:
7757 if (m->m_len < sizeof(struct ip6_hdr))
7758 return (1);
7759 sum = in6_cksum(m, p, off, len);
7760 break;
7761 #endif /* INET6 */
7762 default:
7763 return (1);
7764 }
7765 }
7766 if (sum) {
7767 switch (p) {
7768 case IPPROTO_TCP:
7769 {
7770 KMOD_TCPSTAT_INC(tcps_rcvbadsum);
7771 break;
7772 }
7773 case IPPROTO_UDP:
7774 {
7775 KMOD_UDPSTAT_INC(udps_badsum);
7776 break;
7777 }
7778 #ifdef INET
7779 case IPPROTO_ICMP:
7780 {
7781 KMOD_ICMPSTAT_INC(icps_checksum);
7782 break;
7783 }
7784 #endif
7785 #ifdef INET6
7786 case IPPROTO_ICMPV6:
7787 {
7788 KMOD_ICMP6STAT_INC(icp6s_checksum);
7789 break;
7790 }
7791 #endif /* INET6 */
7792 }
7793 return (1);
7794 } else {
7795 if (p == IPPROTO_TCP || p == IPPROTO_UDP) {
7796 m->m_pkthdr.csum_flags |=
7797 (CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
7798 m->m_pkthdr.csum_data = 0xffff;
7799 }
7800 }
7801 return (0);
7802 }
7803
7804 static bool
pf_pdesc_to_dnflow(const struct pf_pdesc * pd,const struct pf_krule * r,const struct pf_kstate * s,struct ip_fw_args * dnflow)7805 pf_pdesc_to_dnflow(const struct pf_pdesc *pd, const struct pf_krule *r,
7806 const struct pf_kstate *s, struct ip_fw_args *dnflow)
7807 {
7808 int dndir = r->direction;
7809
7810 if (s && dndir == PF_INOUT) {
7811 dndir = s->direction;
7812 } else if (dndir == PF_INOUT) {
7813 /* Assume primary direction. Happens when we've set dnpipe in
7814 * the ethernet level code. */
7815 dndir = pd->dir;
7816 }
7817
7818 if (pd->pf_mtag->flags & PF_MTAG_FLAG_DUMMYNETED)
7819 return (false);
7820
7821 memset(dnflow, 0, sizeof(*dnflow));
7822
7823 if (pd->dport != NULL)
7824 dnflow->f_id.dst_port = ntohs(*pd->dport);
7825 if (pd->sport != NULL)
7826 dnflow->f_id.src_port = ntohs(*pd->sport);
7827
7828 if (pd->dir == PF_IN)
7829 dnflow->flags |= IPFW_ARGS_IN;
7830 else
7831 dnflow->flags |= IPFW_ARGS_OUT;
7832
7833 if (pd->dir != dndir && pd->act.dnrpipe) {
7834 dnflow->rule.info = pd->act.dnrpipe;
7835 }
7836 else if (pd->dir == dndir && pd->act.dnpipe) {
7837 dnflow->rule.info = pd->act.dnpipe;
7838 }
7839 else {
7840 return (false);
7841 }
7842
7843 dnflow->rule.info |= IPFW_IS_DUMMYNET;
7844 if (r->free_flags & PFRULE_DN_IS_PIPE || pd->act.flags & PFSTATE_DN_IS_PIPE)
7845 dnflow->rule.info |= IPFW_IS_PIPE;
7846
7847 dnflow->f_id.proto = pd->proto;
7848 dnflow->f_id.extra = dnflow->rule.info;
7849 switch (pd->af) {
7850 case AF_INET:
7851 dnflow->f_id.addr_type = 4;
7852 dnflow->f_id.src_ip = ntohl(pd->src->v4.s_addr);
7853 dnflow->f_id.dst_ip = ntohl(pd->dst->v4.s_addr);
7854 break;
7855 case AF_INET6:
7856 dnflow->flags |= IPFW_ARGS_IP6;
7857 dnflow->f_id.addr_type = 6;
7858 dnflow->f_id.src_ip6 = pd->src->v6;
7859 dnflow->f_id.dst_ip6 = pd->dst->v6;
7860 break;
7861 default:
7862 panic("Invalid AF");
7863 break;
7864 }
7865
7866 return (true);
7867 }
7868
7869 int
pf_test_eth(int dir,int pflags,struct ifnet * ifp,struct mbuf ** m0,struct inpcb * inp)7870 pf_test_eth(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0,
7871 struct inpcb *inp)
7872 {
7873 struct pfi_kkif *kif;
7874 struct mbuf *m = *m0;
7875
7876 M_ASSERTPKTHDR(m);
7877 MPASS(ifp->if_vnet == curvnet);
7878 NET_EPOCH_ASSERT();
7879
7880 if (!V_pf_status.running)
7881 return (PF_PASS);
7882
7883 kif = (struct pfi_kkif *)ifp->if_pf_kif;
7884
7885 if (kif == NULL) {
7886 DPFPRINTF(PF_DEBUG_URGENT,
7887 ("%s: kif == NULL, if_xname %s\n", __func__, ifp->if_xname));
7888 return (PF_DROP);
7889 }
7890 if (kif->pfik_flags & PFI_IFLAG_SKIP)
7891 return (PF_PASS);
7892
7893 if (m->m_flags & M_SKIP_FIREWALL)
7894 return (PF_PASS);
7895
7896 /* Stateless! */
7897 return (pf_test_eth_rule(dir, kif, m0));
7898 }
7899
7900 static __inline void
pf_dummynet_flag_remove(struct mbuf * m,struct pf_mtag * pf_mtag)7901 pf_dummynet_flag_remove(struct mbuf *m, struct pf_mtag *pf_mtag)
7902 {
7903 struct m_tag *mtag;
7904
7905 pf_mtag->flags &= ~PF_MTAG_FLAG_DUMMYNET;
7906
7907 /* dummynet adds this tag, but pf does not need it,
7908 * and keeping it creates unexpected behavior,
7909 * e.g. in case of divert(4) usage right after dummynet. */
7910 mtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL);
7911 if (mtag != NULL)
7912 m_tag_delete(m, mtag);
7913 }
7914
7915 static int
pf_dummynet(struct pf_pdesc * pd,struct pf_kstate * s,struct pf_krule * r,struct mbuf ** m0)7916 pf_dummynet(struct pf_pdesc *pd, struct pf_kstate *s,
7917 struct pf_krule *r, struct mbuf **m0)
7918 {
7919 return (pf_dummynet_route(pd, s, r, NULL, NULL, m0));
7920 }
7921
7922 static int
pf_dummynet_route(struct pf_pdesc * pd,struct pf_kstate * s,struct pf_krule * r,struct ifnet * ifp,struct sockaddr * sa,struct mbuf ** m0)7923 pf_dummynet_route(struct pf_pdesc *pd, struct pf_kstate *s,
7924 struct pf_krule *r, struct ifnet *ifp, struct sockaddr *sa,
7925 struct mbuf **m0)
7926 {
7927 NET_EPOCH_ASSERT();
7928
7929 if (pd->act.dnpipe || pd->act.dnrpipe) {
7930 struct ip_fw_args dnflow;
7931 if (ip_dn_io_ptr == NULL) {
7932 m_freem(*m0);
7933 *m0 = NULL;
7934 return (ENOMEM);
7935 }
7936
7937 if (pd->pf_mtag == NULL &&
7938 ((pd->pf_mtag = pf_get_mtag(*m0)) == NULL)) {
7939 m_freem(*m0);
7940 *m0 = NULL;
7941 return (ENOMEM);
7942 }
7943
7944 if (ifp != NULL) {
7945 pd->pf_mtag->flags |= PF_MTAG_FLAG_ROUTE_TO;
7946
7947 pd->pf_mtag->if_index = ifp->if_index;
7948 pd->pf_mtag->if_idxgen = ifp->if_idxgen;
7949
7950 MPASS(sa != NULL);
7951
7952 if (pd->af == AF_INET)
7953 memcpy(&pd->pf_mtag->dst, sa,
7954 sizeof(struct sockaddr_in));
7955 else
7956 memcpy(&pd->pf_mtag->dst, sa,
7957 sizeof(struct sockaddr_in6));
7958 }
7959
7960 if (s != NULL && s->nat_rule.ptr != NULL &&
7961 s->nat_rule.ptr->action == PF_RDR &&
7962 (
7963 #ifdef INET
7964 (pd->af == AF_INET && IN_LOOPBACK(ntohl(pd->dst->v4.s_addr))) ||
7965 #endif
7966 (pd->af == AF_INET6 && IN6_IS_ADDR_LOOPBACK(&pd->dst->v6)))) {
7967 /*
7968 * If we're redirecting to loopback mark this packet
7969 * as being local. Otherwise it might get dropped
7970 * if dummynet re-injects.
7971 */
7972 (*m0)->m_pkthdr.rcvif = V_loif;
7973 }
7974
7975 if (pf_pdesc_to_dnflow(pd, r, s, &dnflow)) {
7976 pd->pf_mtag->flags |= PF_MTAG_FLAG_DUMMYNET;
7977 pd->pf_mtag->flags |= PF_MTAG_FLAG_DUMMYNETED;
7978 ip_dn_io_ptr(m0, &dnflow);
7979 if (*m0 != NULL) {
7980 pd->pf_mtag->flags &= ~PF_MTAG_FLAG_ROUTE_TO;
7981 pf_dummynet_flag_remove(*m0, pd->pf_mtag);
7982 }
7983 }
7984 }
7985
7986 return (0);
7987 }
7988
7989 #ifdef INET
7990 int
pf_test(int dir,int pflags,struct ifnet * ifp,struct mbuf ** m0,struct inpcb * inp,struct pf_rule_actions * default_actions)7991 pf_test(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0,
7992 struct inpcb *inp, struct pf_rule_actions *default_actions)
7993 {
7994 struct pfi_kkif *kif;
7995 u_short action, reason = 0;
7996 struct mbuf *m = *m0;
7997 struct ip *h = NULL;
7998 struct m_tag *mtag;
7999 struct pf_krule *a = NULL, *r = &V_pf_default_rule, *tr, *nr;
8000 struct pf_kstate *s = NULL;
8001 struct pf_kruleset *ruleset = NULL;
8002 struct pf_pdesc pd;
8003 int off, dirndx, use_2nd_queue = 0;
8004 uint16_t tag;
8005 uint8_t rt;
8006
8007 PF_RULES_RLOCK_TRACKER;
8008 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: bad direction %d\n", __func__, dir));
8009 M_ASSERTPKTHDR(m);
8010
8011 if (!V_pf_status.running)
8012 return (PF_PASS);
8013
8014 PF_RULES_RLOCK();
8015
8016 kif = (struct pfi_kkif *)ifp->if_pf_kif;
8017
8018 if (__predict_false(kif == NULL)) {
8019 DPFPRINTF(PF_DEBUG_URGENT,
8020 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname));
8021 PF_RULES_RUNLOCK();
8022 return (PF_DROP);
8023 }
8024 if (kif->pfik_flags & PFI_IFLAG_SKIP) {
8025 PF_RULES_RUNLOCK();
8026 return (PF_PASS);
8027 }
8028
8029 if (m->m_flags & M_SKIP_FIREWALL) {
8030 PF_RULES_RUNLOCK();
8031 return (PF_PASS);
8032 }
8033
8034 memset(&pd, 0, sizeof(pd));
8035 TAILQ_INIT(&pd.sctp_multihome_jobs);
8036 if (default_actions != NULL)
8037 memcpy(&pd.act, default_actions, sizeof(pd.act));
8038 pd.pf_mtag = pf_find_mtag(m);
8039
8040 if (pd.pf_mtag != NULL && (pd.pf_mtag->flags & PF_MTAG_FLAG_ROUTE_TO)) {
8041 pd.pf_mtag->flags &= ~PF_MTAG_FLAG_ROUTE_TO;
8042
8043 ifp = ifnet_byindexgen(pd.pf_mtag->if_index,
8044 pd.pf_mtag->if_idxgen);
8045 if (ifp == NULL || ifp->if_flags & IFF_DYING) {
8046 PF_RULES_RUNLOCK();
8047 m_freem(*m0);
8048 *m0 = NULL;
8049 return (PF_PASS);
8050 }
8051 PF_RULES_RUNLOCK();
8052 (ifp->if_output)(ifp, m, sintosa(&pd.pf_mtag->dst), NULL);
8053 *m0 = NULL;
8054 return (PF_PASS);
8055 }
8056
8057 if (pd.pf_mtag && pd.pf_mtag->dnpipe) {
8058 pd.act.dnpipe = pd.pf_mtag->dnpipe;
8059 pd.act.flags = pd.pf_mtag->dnflags;
8060 }
8061
8062 if (ip_dn_io_ptr != NULL && pd.pf_mtag != NULL &&
8063 pd.pf_mtag->flags & PF_MTAG_FLAG_DUMMYNET) {
8064 /* Dummynet re-injects packets after they've
8065 * completed their delay. We've already
8066 * processed them, so pass unconditionally. */
8067
8068 /* But only once. We may see the packet multiple times (e.g.
8069 * PFIL_IN/PFIL_OUT). */
8070 pf_dummynet_flag_remove(m, pd.pf_mtag);
8071 PF_RULES_RUNLOCK();
8072
8073 return (PF_PASS);
8074 }
8075
8076 pd.sport = pd.dport = NULL;
8077 pd.proto_sum = NULL;
8078 pd.dir = dir;
8079 pd.sidx = (dir == PF_IN) ? 0 : 1;
8080 pd.didx = (dir == PF_IN) ? 1 : 0;
8081 pd.af = AF_INET;
8082 pd.act.rtableid = -1;
8083
8084 h = mtod(m, struct ip *);
8085 off = h->ip_hl << 2;
8086
8087 if (__predict_false(ip_divert_ptr != NULL) &&
8088 ((mtag = m_tag_locate(m, MTAG_PF_DIVERT, 0, NULL)) != NULL)) {
8089 struct pf_divert_mtag *dt = (struct pf_divert_mtag *)(mtag+1);
8090 if ((dt->idir == PF_DIVERT_MTAG_DIR_IN && dir == PF_IN) ||
8091 (dt->idir == PF_DIVERT_MTAG_DIR_OUT && dir == PF_OUT)) {
8092 if (pd.pf_mtag == NULL &&
8093 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
8094 action = PF_DROP;
8095 goto done;
8096 }
8097 pd.pf_mtag->flags |= PF_MTAG_FLAG_PACKET_LOOPED;
8098 }
8099 if (pd.pf_mtag && pd.pf_mtag->flags & PF_MTAG_FLAG_FASTFWD_OURS_PRESENT) {
8100 m->m_flags |= M_FASTFWD_OURS;
8101 pd.pf_mtag->flags &= ~PF_MTAG_FLAG_FASTFWD_OURS_PRESENT;
8102 }
8103 m_tag_delete(m, mtag);
8104
8105 mtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL);
8106 if (mtag != NULL)
8107 m_tag_delete(m, mtag);
8108 } else if (pf_normalize_ip(m0, kif, &reason, &pd) != PF_PASS) {
8109 /* We do IP header normalization and packet reassembly here */
8110 action = PF_DROP;
8111 goto done;
8112 }
8113 m = *m0; /* pf_normalize messes with m0 */
8114 h = mtod(m, struct ip *);
8115
8116 off = h->ip_hl << 2;
8117 if (off < (int)sizeof(struct ip)) {
8118 action = PF_DROP;
8119 REASON_SET(&reason, PFRES_SHORT);
8120 pd.act.log = PF_LOG_FORCE;
8121 goto done;
8122 }
8123
8124 pd.src = (struct pf_addr *)&h->ip_src;
8125 pd.dst = (struct pf_addr *)&h->ip_dst;
8126 pd.ip_sum = &h->ip_sum;
8127 pd.proto = h->ip_p;
8128 pd.tos = h->ip_tos & ~IPTOS_ECN_MASK;
8129 pd.tot_len = ntohs(h->ip_len);
8130
8131 /* handle fragments that didn't get reassembled by normalization */
8132 if (h->ip_off & htons(IP_MF | IP_OFFMASK)) {
8133 action = pf_test_fragment(&r, kif, m, h, &pd, &a, &ruleset);
8134 goto done;
8135 }
8136
8137 switch (h->ip_p) {
8138 case IPPROTO_TCP: {
8139 if (!pf_pull_hdr(m, off, &pd.hdr.tcp, sizeof(pd.hdr.tcp),
8140 &action, &reason, AF_INET)) {
8141 if (action != PF_PASS)
8142 pd.act.log = PF_LOG_FORCE;
8143 goto done;
8144 }
8145 pd.p_len = pd.tot_len - off - (pd.hdr.tcp.th_off << 2);
8146
8147 pd.sport = &pd.hdr.tcp.th_sport;
8148 pd.dport = &pd.hdr.tcp.th_dport;
8149
8150 /* Respond to SYN with a syncookie. */
8151 if ((pd.hdr.tcp.th_flags & (TH_SYN|TH_ACK|TH_RST)) == TH_SYN &&
8152 pd.dir == PF_IN && pf_synflood_check(&pd)) {
8153 pf_syncookie_send(m, off, &pd);
8154 action = PF_DROP;
8155 break;
8156 }
8157
8158 if ((pd.hdr.tcp.th_flags & TH_ACK) && pd.p_len == 0)
8159 use_2nd_queue = 1;
8160 action = pf_normalize_tcp(kif, m, 0, off, h, &pd);
8161 if (action == PF_DROP)
8162 goto done;
8163 action = pf_test_state_tcp(&s, kif, m, off, h, &pd, &reason);
8164 if (action == PF_PASS) {
8165 if (V_pfsync_update_state_ptr != NULL)
8166 V_pfsync_update_state_ptr(s);
8167 r = s->rule.ptr;
8168 a = s->anchor.ptr;
8169 } else if (s == NULL) {
8170 /* Validate remote SYN|ACK, re-create original SYN if
8171 * valid. */
8172 if ((pd.hdr.tcp.th_flags & (TH_SYN|TH_ACK|TH_RST)) ==
8173 TH_ACK && pf_syncookie_validate(&pd) &&
8174 pd.dir == PF_IN) {
8175 struct mbuf *msyn;
8176
8177 msyn = pf_syncookie_recreate_syn(h->ip_ttl, off,
8178 &pd);
8179 if (msyn == NULL) {
8180 action = PF_DROP;
8181 break;
8182 }
8183
8184 action = pf_test(dir, pflags, ifp, &msyn, inp,
8185 &pd.act);
8186 m_freem(msyn);
8187 if (action != PF_PASS)
8188 break;
8189
8190 action = pf_test_state_tcp(&s, kif, m, off, h,
8191 &pd, &reason);
8192 if (action != PF_PASS || s == NULL) {
8193 action = PF_DROP;
8194 break;
8195 }
8196
8197 s->src.seqhi = ntohl(pd.hdr.tcp.th_ack) - 1;
8198 s->src.seqlo = ntohl(pd.hdr.tcp.th_seq) - 1;
8199 pf_set_protostate(s, PF_PEER_SRC, PF_TCPS_PROXY_DST);
8200 action = pf_synproxy(&pd, &s, &reason);
8201 break;
8202 } else {
8203 action = pf_test_rule(&r, &s, kif, m, off, &pd,
8204 &a, &ruleset, inp);
8205 }
8206 }
8207 break;
8208 }
8209
8210 case IPPROTO_UDP: {
8211 if (!pf_pull_hdr(m, off, &pd.hdr.udp, sizeof(pd.hdr.udp),
8212 &action, &reason, AF_INET)) {
8213 if (action != PF_PASS)
8214 pd.act.log = PF_LOG_FORCE;
8215 goto done;
8216 }
8217 pd.sport = &pd.hdr.udp.uh_sport;
8218 pd.dport = &pd.hdr.udp.uh_dport;
8219 if (pd.hdr.udp.uh_dport == 0 ||
8220 ntohs(pd.hdr.udp.uh_ulen) > m->m_pkthdr.len - off ||
8221 ntohs(pd.hdr.udp.uh_ulen) < sizeof(struct udphdr)) {
8222 action = PF_DROP;
8223 REASON_SET(&reason, PFRES_SHORT);
8224 goto done;
8225 }
8226 action = pf_test_state_udp(&s, kif, m, off, h, &pd);
8227 if (action == PF_PASS) {
8228 if (V_pfsync_update_state_ptr != NULL)
8229 V_pfsync_update_state_ptr(s);
8230 r = s->rule.ptr;
8231 a = s->anchor.ptr;
8232 } else if (s == NULL)
8233 action = pf_test_rule(&r, &s, kif, m, off, &pd,
8234 &a, &ruleset, inp);
8235 break;
8236 }
8237
8238 case IPPROTO_SCTP: {
8239 if (!pf_pull_hdr(m, off, &pd.hdr.sctp, sizeof(pd.hdr.sctp),
8240 &action, &reason, AF_INET)) {
8241 if (action != PF_PASS)
8242 pd.act.log |= PF_LOG_FORCE;
8243 goto done;
8244 }
8245 pd.p_len = pd.tot_len - off;
8246
8247 pd.sport = &pd.hdr.sctp.src_port;
8248 pd.dport = &pd.hdr.sctp.dest_port;
8249 if (pd.hdr.sctp.src_port == 0 || pd.hdr.sctp.dest_port == 0) {
8250 action = PF_DROP;
8251 REASON_SET(&reason, PFRES_SHORT);
8252 goto done;
8253 }
8254 action = pf_normalize_sctp(dir, kif, m, 0, off, h, &pd);
8255 if (action == PF_DROP)
8256 goto done;
8257 action = pf_test_state_sctp(&s, kif, m, off, h, &pd,
8258 &reason);
8259 if (action == PF_PASS) {
8260 if (V_pfsync_update_state_ptr != NULL)
8261 V_pfsync_update_state_ptr(s);
8262 r = s->rule.ptr;
8263 a = s->anchor.ptr;
8264 } else {
8265 action = pf_test_rule(&r, &s, kif, m, off,
8266 &pd, &a, &ruleset, inp);
8267 }
8268 break;
8269 }
8270
8271 case IPPROTO_ICMP: {
8272 if (!pf_pull_hdr(m, off, &pd.hdr.icmp, ICMP_MINLEN,
8273 &action, &reason, AF_INET)) {
8274 if (action != PF_PASS)
8275 pd.act.log = PF_LOG_FORCE;
8276 goto done;
8277 }
8278 action = pf_test_state_icmp(&s, kif, m, off, h, &pd, &reason);
8279 if (action == PF_PASS) {
8280 if (V_pfsync_update_state_ptr != NULL)
8281 V_pfsync_update_state_ptr(s);
8282 r = s->rule.ptr;
8283 a = s->anchor.ptr;
8284 } else if (s == NULL)
8285 action = pf_test_rule(&r, &s, kif, m, off, &pd,
8286 &a, &ruleset, inp);
8287 break;
8288 }
8289
8290 #ifdef INET6
8291 case IPPROTO_ICMPV6: {
8292 action = PF_DROP;
8293 DPFPRINTF(PF_DEBUG_MISC,
8294 ("pf: dropping IPv4 packet with ICMPv6 payload\n"));
8295 goto done;
8296 }
8297 #endif
8298
8299 default:
8300 action = pf_test_state_other(&s, kif, m, &pd);
8301 if (action == PF_PASS) {
8302 if (V_pfsync_update_state_ptr != NULL)
8303 V_pfsync_update_state_ptr(s);
8304 r = s->rule.ptr;
8305 a = s->anchor.ptr;
8306 } else if (s == NULL)
8307 action = pf_test_rule(&r, &s, kif, m, off, &pd,
8308 &a, &ruleset, inp);
8309 break;
8310 }
8311
8312 done:
8313 PF_RULES_RUNLOCK();
8314 if (action == PF_PASS && h->ip_hl > 5 &&
8315 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
8316 action = PF_DROP;
8317 REASON_SET(&reason, PFRES_IPOPTIONS);
8318 pd.act.log = PF_LOG_FORCE;
8319 DPFPRINTF(PF_DEBUG_MISC,
8320 ("pf: dropping packet with ip options\n"));
8321 }
8322
8323 if (s) {
8324 uint8_t log = pd.act.log;
8325 memcpy(&pd.act, &s->act, sizeof(struct pf_rule_actions));
8326 pd.act.log |= log;
8327 tag = s->tag;
8328 rt = s->rt;
8329 } else {
8330 tag = r->tag;
8331 rt = r->rt;
8332 }
8333
8334 if (tag > 0 && pf_tag_packet(m, &pd, tag)) {
8335 action = PF_DROP;
8336 REASON_SET(&reason, PFRES_MEMORY);
8337 }
8338
8339 pf_scrub_ip(&m, &pd);
8340 if (pd.proto == IPPROTO_TCP && pd.act.max_mss)
8341 pf_normalize_mss(m, off, &pd);
8342
8343 if (pd.act.rtableid >= 0)
8344 M_SETFIB(m, pd.act.rtableid);
8345
8346 if (pd.act.flags & PFSTATE_SETPRIO) {
8347 if (pd.tos & IPTOS_LOWDELAY)
8348 use_2nd_queue = 1;
8349 if (vlan_set_pcp(m, pd.act.set_prio[use_2nd_queue])) {
8350 action = PF_DROP;
8351 REASON_SET(&reason, PFRES_MEMORY);
8352 pd.act.log = PF_LOG_FORCE;
8353 DPFPRINTF(PF_DEBUG_MISC,
8354 ("pf: failed to allocate 802.1q mtag\n"));
8355 }
8356 }
8357
8358 #ifdef ALTQ
8359 if (action == PF_PASS && pd.act.qid) {
8360 if (pd.pf_mtag == NULL &&
8361 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
8362 action = PF_DROP;
8363 REASON_SET(&reason, PFRES_MEMORY);
8364 } else {
8365 if (s != NULL)
8366 pd.pf_mtag->qid_hash = pf_state_hash(s);
8367 if (use_2nd_queue || (pd.tos & IPTOS_LOWDELAY))
8368 pd.pf_mtag->qid = pd.act.pqid;
8369 else
8370 pd.pf_mtag->qid = pd.act.qid;
8371 /* Add hints for ecn. */
8372 pd.pf_mtag->hdr = h;
8373 }
8374 }
8375 #endif /* ALTQ */
8376
8377 /*
8378 * connections redirected to loopback should not match sockets
8379 * bound specifically to loopback due to security implications,
8380 * see tcp_input() and in_pcblookup_listen().
8381 */
8382 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
8383 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
8384 (s->nat_rule.ptr->action == PF_RDR ||
8385 s->nat_rule.ptr->action == PF_BINAT) &&
8386 IN_LOOPBACK(ntohl(pd.dst->v4.s_addr)))
8387 m->m_flags |= M_SKIP_FIREWALL;
8388
8389 if (__predict_false(ip_divert_ptr != NULL) && action == PF_PASS &&
8390 r->divert.port && !PACKET_LOOPED(&pd)) {
8391 mtag = m_tag_alloc(MTAG_PF_DIVERT, 0,
8392 sizeof(struct pf_divert_mtag), M_NOWAIT | M_ZERO);
8393 if (mtag != NULL) {
8394 ((struct pf_divert_mtag *)(mtag+1))->port =
8395 ntohs(r->divert.port);
8396 ((struct pf_divert_mtag *)(mtag+1))->idir =
8397 (dir == PF_IN) ? PF_DIVERT_MTAG_DIR_IN :
8398 PF_DIVERT_MTAG_DIR_OUT;
8399
8400 if (s)
8401 PF_STATE_UNLOCK(s);
8402
8403 m_tag_prepend(m, mtag);
8404 if (m->m_flags & M_FASTFWD_OURS) {
8405 if (pd.pf_mtag == NULL &&
8406 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
8407 action = PF_DROP;
8408 REASON_SET(&reason, PFRES_MEMORY);
8409 pd.act.log = PF_LOG_FORCE;
8410 DPFPRINTF(PF_DEBUG_MISC,
8411 ("pf: failed to allocate tag\n"));
8412 } else {
8413 pd.pf_mtag->flags |=
8414 PF_MTAG_FLAG_FASTFWD_OURS_PRESENT;
8415 m->m_flags &= ~M_FASTFWD_OURS;
8416 }
8417 }
8418 ip_divert_ptr(*m0, dir == PF_IN);
8419 *m0 = NULL;
8420
8421 return (action);
8422 } else {
8423 /* XXX: ipfw has the same behaviour! */
8424 action = PF_DROP;
8425 REASON_SET(&reason, PFRES_MEMORY);
8426 pd.act.log = PF_LOG_FORCE;
8427 DPFPRINTF(PF_DEBUG_MISC,
8428 ("pf: failed to allocate divert tag\n"));
8429 }
8430 }
8431 /* this flag will need revising if the pkt is forwarded */
8432 if (pd.pf_mtag)
8433 pd.pf_mtag->flags &= ~PF_MTAG_FLAG_PACKET_LOOPED;
8434
8435 if (pd.act.log) {
8436 struct pf_krule *lr;
8437 struct pf_krule_item *ri;
8438
8439 if (s != NULL && s->nat_rule.ptr != NULL &&
8440 s->nat_rule.ptr->log & PF_LOG_ALL)
8441 lr = s->nat_rule.ptr;
8442 else
8443 lr = r;
8444
8445 if (pd.act.log & PF_LOG_FORCE || lr->log & PF_LOG_ALL)
8446 PFLOG_PACKET(kif, m, AF_INET, action, reason, lr, a,
8447 ruleset, &pd, (s == NULL));
8448 if (s) {
8449 SLIST_FOREACH(ri, &s->match_rules, entry)
8450 if (ri->r->log & PF_LOG_ALL)
8451 PFLOG_PACKET(kif, m, AF_INET, action,
8452 reason, ri->r, a, ruleset, &pd, 0);
8453 }
8454 }
8455
8456 pf_counter_u64_critical_enter();
8457 pf_counter_u64_add_protected(&kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS],
8458 pd.tot_len);
8459 pf_counter_u64_add_protected(&kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS],
8460 1);
8461
8462 if (action == PF_PASS || r->action == PF_DROP) {
8463 dirndx = (dir == PF_OUT);
8464 pf_counter_u64_add_protected(&r->packets[dirndx], 1);
8465 pf_counter_u64_add_protected(&r->bytes[dirndx], pd.tot_len);
8466 pf_update_timestamp(r);
8467
8468 if (a != NULL) {
8469 pf_counter_u64_add_protected(&a->packets[dirndx], 1);
8470 pf_counter_u64_add_protected(&a->bytes[dirndx], pd.tot_len);
8471 }
8472 if (s != NULL) {
8473 struct pf_krule_item *ri;
8474
8475 if (s->nat_rule.ptr != NULL) {
8476 pf_counter_u64_add_protected(&s->nat_rule.ptr->packets[dirndx],
8477 1);
8478 pf_counter_u64_add_protected(&s->nat_rule.ptr->bytes[dirndx],
8479 pd.tot_len);
8480 }
8481 if (s->src_node != NULL) {
8482 counter_u64_add(s->src_node->packets[dirndx],
8483 1);
8484 counter_u64_add(s->src_node->bytes[dirndx],
8485 pd.tot_len);
8486 }
8487 if (s->nat_src_node != NULL) {
8488 counter_u64_add(s->nat_src_node->packets[dirndx],
8489 1);
8490 counter_u64_add(s->nat_src_node->bytes[dirndx],
8491 pd.tot_len);
8492 }
8493 dirndx = (dir == s->direction) ? 0 : 1;
8494 s->packets[dirndx]++;
8495 s->bytes[dirndx] += pd.tot_len;
8496 SLIST_FOREACH(ri, &s->match_rules, entry) {
8497 pf_counter_u64_add_protected(&ri->r->packets[dirndx], 1);
8498 pf_counter_u64_add_protected(&ri->r->bytes[dirndx], pd.tot_len);
8499 }
8500 }
8501 tr = r;
8502 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
8503 if (nr != NULL && r == &V_pf_default_rule)
8504 tr = nr;
8505 if (tr->src.addr.type == PF_ADDR_TABLE)
8506 pfr_update_stats(tr->src.addr.p.tbl,
8507 (s == NULL) ? pd.src :
8508 &s->key[(s->direction == PF_IN)]->
8509 addr[(s->direction == PF_OUT)],
8510 pd.af, pd.tot_len, dir == PF_OUT,
8511 r->action == PF_PASS, tr->src.neg);
8512 if (tr->dst.addr.type == PF_ADDR_TABLE)
8513 pfr_update_stats(tr->dst.addr.p.tbl,
8514 (s == NULL) ? pd.dst :
8515 &s->key[(s->direction == PF_IN)]->
8516 addr[(s->direction == PF_IN)],
8517 pd.af, pd.tot_len, dir == PF_OUT,
8518 r->action == PF_PASS, tr->dst.neg);
8519 }
8520 pf_counter_u64_critical_exit();
8521
8522 switch (action) {
8523 case PF_SYNPROXY_DROP:
8524 m_freem(*m0);
8525 case PF_DEFER:
8526 *m0 = NULL;
8527 action = PF_PASS;
8528 break;
8529 case PF_DROP:
8530 m_freem(*m0);
8531 *m0 = NULL;
8532 break;
8533 default:
8534 /* pf_route() returns unlocked. */
8535 if (rt) {
8536 pf_route(m0, r, kif->pfik_ifp, s, &pd, inp);
8537 goto out;
8538 }
8539 if (pf_dummynet(&pd, s, r, m0) != 0) {
8540 action = PF_DROP;
8541 REASON_SET(&reason, PFRES_MEMORY);
8542 }
8543 break;
8544 }
8545
8546 SDT_PROBE4(pf, ip, test, done, action, reason, r, s);
8547
8548 if (s && action != PF_DROP) {
8549 if (!s->if_index_in && dir == PF_IN)
8550 s->if_index_in = ifp->if_index;
8551 else if (!s->if_index_out && dir == PF_OUT)
8552 s->if_index_out = ifp->if_index;
8553 }
8554
8555 if (s)
8556 PF_STATE_UNLOCK(s);
8557
8558 out:
8559 pf_sctp_multihome_delayed(&pd, off, kif, s, action);
8560
8561 return (action);
8562 }
8563 #endif /* INET */
8564
8565 #ifdef INET6
8566 int
pf_test6(int dir,int pflags,struct ifnet * ifp,struct mbuf ** m0,struct inpcb * inp,struct pf_rule_actions * default_actions)8567 pf_test6(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp,
8568 struct pf_rule_actions *default_actions)
8569 {
8570 struct pfi_kkif *kif;
8571 u_short action, reason = 0;
8572 struct mbuf *m = *m0, *n = NULL;
8573 struct m_tag *mtag;
8574 struct ip6_hdr *h = NULL;
8575 struct pf_krule *a = NULL, *r = &V_pf_default_rule, *tr, *nr;
8576 struct pf_kstate *s = NULL;
8577 struct pf_kruleset *ruleset = NULL;
8578 struct pf_pdesc pd;
8579 int off, terminal = 0, dirndx, rh_cnt = 0, use_2nd_queue = 0;
8580 uint16_t tag;
8581 uint8_t rt;
8582
8583 PF_RULES_RLOCK_TRACKER;
8584 KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: bad direction %d\n", __func__, dir));
8585 M_ASSERTPKTHDR(m);
8586
8587 if (!V_pf_status.running)
8588 return (PF_PASS);
8589
8590 PF_RULES_RLOCK();
8591
8592 kif = (struct pfi_kkif *)ifp->if_pf_kif;
8593 if (__predict_false(kif == NULL)) {
8594 DPFPRINTF(PF_DEBUG_URGENT,
8595 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname));
8596 PF_RULES_RUNLOCK();
8597 return (PF_DROP);
8598 }
8599 if (kif->pfik_flags & PFI_IFLAG_SKIP) {
8600 PF_RULES_RUNLOCK();
8601 return (PF_PASS);
8602 }
8603
8604 if (m->m_flags & M_SKIP_FIREWALL) {
8605 PF_RULES_RUNLOCK();
8606 return (PF_PASS);
8607 }
8608
8609 /*
8610 * If we end up changing IP addresses (e.g. binat) the stack may get
8611 * confused and fail to send the icmp6 packet too big error. Just send
8612 * it here, before we do any NAT.
8613 */
8614 if (dir == PF_OUT && pflags & PFIL_FWD && IN6_LINKMTU(ifp) < pf_max_frag_size(m)) {
8615 PF_RULES_RUNLOCK();
8616 *m0 = NULL;
8617 icmp6_error(m, ICMP6_PACKET_TOO_BIG, 0, IN6_LINKMTU(ifp));
8618 return (PF_DROP);
8619 }
8620
8621 memset(&pd, 0, sizeof(pd));
8622 TAILQ_INIT(&pd.sctp_multihome_jobs);
8623 if (default_actions != NULL)
8624 memcpy(&pd.act, default_actions, sizeof(pd.act));
8625 pd.pf_mtag = pf_find_mtag(m);
8626
8627 if (pd.pf_mtag != NULL && (pd.pf_mtag->flags & PF_MTAG_FLAG_ROUTE_TO)) {
8628 pd.pf_mtag->flags &= ~PF_MTAG_FLAG_ROUTE_TO;
8629
8630 ifp = ifnet_byindexgen(pd.pf_mtag->if_index,
8631 pd.pf_mtag->if_idxgen);
8632 if (ifp == NULL || ifp->if_flags & IFF_DYING) {
8633 PF_RULES_RUNLOCK();
8634 m_freem(*m0);
8635 *m0 = NULL;
8636 return (PF_PASS);
8637 }
8638 PF_RULES_RUNLOCK();
8639 nd6_output_ifp(ifp, ifp, m,
8640 (struct sockaddr_in6 *)&pd.pf_mtag->dst, NULL);
8641 *m0 = NULL;
8642 return (PF_PASS);
8643 }
8644
8645 if (pd.pf_mtag && pd.pf_mtag->dnpipe) {
8646 pd.act.dnpipe = pd.pf_mtag->dnpipe;
8647 pd.act.flags = pd.pf_mtag->dnflags;
8648 }
8649
8650 if (ip_dn_io_ptr != NULL && pd.pf_mtag != NULL &&
8651 pd.pf_mtag->flags & PF_MTAG_FLAG_DUMMYNET) {
8652 pf_dummynet_flag_remove(m, pd.pf_mtag);
8653 /* Dummynet re-injects packets after they've
8654 * completed their delay. We've already
8655 * processed them, so pass unconditionally. */
8656 PF_RULES_RUNLOCK();
8657 return (PF_PASS);
8658 }
8659
8660 pd.sport = pd.dport = NULL;
8661 pd.ip_sum = NULL;
8662 pd.proto_sum = NULL;
8663 pd.dir = dir;
8664 pd.sidx = (dir == PF_IN) ? 0 : 1;
8665 pd.didx = (dir == PF_IN) ? 1 : 0;
8666 pd.af = AF_INET6;
8667 pd.act.rtableid = -1;
8668
8669 h = mtod(m, struct ip6_hdr *);
8670 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
8671
8672 /* We do IP header normalization and packet reassembly here */
8673 if (pf_normalize_ip6(m0, kif, &reason, &pd) != PF_PASS) {
8674 action = PF_DROP;
8675 goto done;
8676 }
8677 m = *m0; /* pf_normalize messes with m0 */
8678 h = mtod(m, struct ip6_hdr *);
8679 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
8680
8681 /*
8682 * we do not support jumbogram. if we keep going, zero ip6_plen
8683 * will do something bad, so drop the packet for now.
8684 */
8685 if (htons(h->ip6_plen) == 0) {
8686 action = PF_DROP;
8687 REASON_SET(&reason, PFRES_NORM); /*XXX*/
8688 goto done;
8689 }
8690
8691 pd.src = (struct pf_addr *)&h->ip6_src;
8692 pd.dst = (struct pf_addr *)&h->ip6_dst;
8693 pd.tos = IPV6_DSCP(h);
8694 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
8695
8696 pd.proto = h->ip6_nxt;
8697 do {
8698 switch (pd.proto) {
8699 case IPPROTO_FRAGMENT:
8700 action = pf_test_fragment(&r, kif, m, h, &pd, &a,
8701 &ruleset);
8702 if (action == PF_DROP)
8703 REASON_SET(&reason, PFRES_FRAG);
8704 goto done;
8705 case IPPROTO_ROUTING: {
8706 struct ip6_rthdr rthdr;
8707
8708 if (rh_cnt++) {
8709 DPFPRINTF(PF_DEBUG_MISC,
8710 ("pf: IPv6 more than one rthdr\n"));
8711 action = PF_DROP;
8712 REASON_SET(&reason, PFRES_IPOPTIONS);
8713 pd.act.log = PF_LOG_FORCE;
8714 goto done;
8715 }
8716 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL,
8717 &reason, pd.af)) {
8718 DPFPRINTF(PF_DEBUG_MISC,
8719 ("pf: IPv6 short rthdr\n"));
8720 action = PF_DROP;
8721 REASON_SET(&reason, PFRES_SHORT);
8722 pd.act.log = PF_LOG_FORCE;
8723 goto done;
8724 }
8725 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) {
8726 DPFPRINTF(PF_DEBUG_MISC,
8727 ("pf: IPv6 rthdr0\n"));
8728 action = PF_DROP;
8729 REASON_SET(&reason, PFRES_IPOPTIONS);
8730 pd.act.log = PF_LOG_FORCE;
8731 goto done;
8732 }
8733 /* FALLTHROUGH */
8734 }
8735 case IPPROTO_AH:
8736 case IPPROTO_HOPOPTS:
8737 case IPPROTO_DSTOPTS: {
8738 /* get next header and header length */
8739 struct ip6_ext opt6;
8740
8741 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
8742 NULL, &reason, pd.af)) {
8743 DPFPRINTF(PF_DEBUG_MISC,
8744 ("pf: IPv6 short opt\n"));
8745 action = PF_DROP;
8746 pd.act.log = PF_LOG_FORCE;
8747 goto done;
8748 }
8749 if (pd.proto == IPPROTO_AH)
8750 off += (opt6.ip6e_len + 2) * 4;
8751 else
8752 off += (opt6.ip6e_len + 1) * 8;
8753 pd.proto = opt6.ip6e_nxt;
8754 /* goto the next header */
8755 break;
8756 }
8757 default:
8758 terminal++;
8759 break;
8760 }
8761 } while (!terminal);
8762
8763 /* if there's no routing header, use unmodified mbuf for checksumming */
8764 if (!n)
8765 n = m;
8766
8767 switch (pd.proto) {
8768 case IPPROTO_TCP: {
8769 if (!pf_pull_hdr(m, off, &pd.hdr.tcp, sizeof(pd.hdr.tcp),
8770 &action, &reason, AF_INET6)) {
8771 if (action != PF_PASS)
8772 pd.act.log |= PF_LOG_FORCE;
8773 goto done;
8774 }
8775 pd.p_len = pd.tot_len - off - (pd.hdr.tcp.th_off << 2);
8776 pd.sport = &pd.hdr.tcp.th_sport;
8777 pd.dport = &pd.hdr.tcp.th_dport;
8778
8779 /* Respond to SYN with a syncookie. */
8780 if ((pd.hdr.tcp.th_flags & (TH_SYN|TH_ACK|TH_RST)) == TH_SYN &&
8781 pd.dir == PF_IN && pf_synflood_check(&pd)) {
8782 pf_syncookie_send(m, off, &pd);
8783 action = PF_DROP;
8784 break;
8785 }
8786
8787 action = pf_normalize_tcp(kif, m, 0, off, h, &pd);
8788 if (action == PF_DROP)
8789 goto done;
8790 action = pf_test_state_tcp(&s, kif, m, off, h, &pd, &reason);
8791 if (action == PF_PASS) {
8792 if (V_pfsync_update_state_ptr != NULL)
8793 V_pfsync_update_state_ptr(s);
8794 r = s->rule.ptr;
8795 a = s->anchor.ptr;
8796 } else if (s == NULL) {
8797 /* Validate remote SYN|ACK, re-create original SYN if
8798 * valid. */
8799 if ((pd.hdr.tcp.th_flags & (TH_SYN|TH_ACK|TH_RST)) ==
8800 TH_ACK && pf_syncookie_validate(&pd) &&
8801 pd.dir == PF_IN) {
8802 struct mbuf *msyn;
8803
8804 msyn = pf_syncookie_recreate_syn(h->ip6_hlim,
8805 off, &pd);
8806 if (msyn == NULL) {
8807 action = PF_DROP;
8808 break;
8809 }
8810
8811 action = pf_test6(dir, pflags, ifp, &msyn, inp,
8812 &pd.act);
8813 m_freem(msyn);
8814 if (action != PF_PASS)
8815 break;
8816
8817 action = pf_test_state_tcp(&s, kif, m, off, h,
8818 &pd, &reason);
8819 if (action != PF_PASS || s == NULL) {
8820 action = PF_DROP;
8821 break;
8822 }
8823
8824 s->src.seqhi = ntohl(pd.hdr.tcp.th_ack) - 1;
8825 s->src.seqlo = ntohl(pd.hdr.tcp.th_seq) - 1;
8826 pf_set_protostate(s, PF_PEER_SRC, PF_TCPS_PROXY_DST);
8827
8828 action = pf_synproxy(&pd, &s, &reason);
8829 break;
8830 } else {
8831 action = pf_test_rule(&r, &s, kif, m, off, &pd,
8832 &a, &ruleset, inp);
8833 }
8834 }
8835 break;
8836 }
8837
8838 case IPPROTO_UDP: {
8839 if (!pf_pull_hdr(m, off, &pd.hdr.udp, sizeof(pd.hdr.udp),
8840 &action, &reason, AF_INET6)) {
8841 if (action != PF_PASS)
8842 pd.act.log |= PF_LOG_FORCE;
8843 goto done;
8844 }
8845 pd.sport = &pd.hdr.udp.uh_sport;
8846 pd.dport = &pd.hdr.udp.uh_dport;
8847 if (pd.hdr.udp.uh_dport == 0 ||
8848 ntohs(pd.hdr.udp.uh_ulen) > m->m_pkthdr.len - off ||
8849 ntohs(pd.hdr.udp.uh_ulen) < sizeof(struct udphdr)) {
8850 action = PF_DROP;
8851 REASON_SET(&reason, PFRES_SHORT);
8852 goto done;
8853 }
8854 action = pf_test_state_udp(&s, kif, m, off, h, &pd);
8855 if (action == PF_PASS) {
8856 if (V_pfsync_update_state_ptr != NULL)
8857 V_pfsync_update_state_ptr(s);
8858 r = s->rule.ptr;
8859 a = s->anchor.ptr;
8860 } else if (s == NULL)
8861 action = pf_test_rule(&r, &s, kif, m, off, &pd,
8862 &a, &ruleset, inp);
8863 break;
8864 }
8865
8866 case IPPROTO_SCTP: {
8867 if (!pf_pull_hdr(m, off, &pd.hdr.sctp, sizeof(pd.hdr.sctp),
8868 &action, &reason, AF_INET6)) {
8869 if (action != PF_PASS)
8870 pd.act.log |= PF_LOG_FORCE;
8871 goto done;
8872 }
8873 pd.sport = &pd.hdr.sctp.src_port;
8874 pd.dport = &pd.hdr.sctp.dest_port;
8875 if (pd.hdr.sctp.src_port == 0 || pd.hdr.sctp.dest_port == 0) {
8876 action = PF_DROP;
8877 REASON_SET(&reason, PFRES_SHORT);
8878 goto done;
8879 }
8880 action = pf_normalize_sctp(dir, kif, m, 0, off, h, &pd);
8881 if (action == PF_DROP)
8882 goto done;
8883 action = pf_test_state_sctp(&s, kif, m, off, h, &pd,
8884 &reason);
8885 if (action == PF_PASS) {
8886 if (V_pfsync_update_state_ptr != NULL)
8887 V_pfsync_update_state_ptr(s);
8888 r = s->rule.ptr;
8889 a = s->anchor.ptr;
8890 } else {
8891 action = pf_test_rule(&r, &s, kif, m, off,
8892 &pd, &a, &ruleset, inp);
8893 }
8894 break;
8895 }
8896
8897 case IPPROTO_ICMP: {
8898 action = PF_DROP;
8899 DPFPRINTF(PF_DEBUG_MISC,
8900 ("pf: dropping IPv6 packet with ICMPv4 payload\n"));
8901 goto done;
8902 }
8903
8904 case IPPROTO_ICMPV6: {
8905 if (!pf_pull_hdr(m, off, &pd.hdr.icmp6, sizeof(pd.hdr.icmp6),
8906 &action, &reason, AF_INET6)) {
8907 if (action != PF_PASS)
8908 pd.act.log |= PF_LOG_FORCE;
8909 goto done;
8910 }
8911 action = pf_test_state_icmp(&s, kif, m, off, h, &pd, &reason);
8912 if (action == PF_PASS) {
8913 if (V_pfsync_update_state_ptr != NULL)
8914 V_pfsync_update_state_ptr(s);
8915 r = s->rule.ptr;
8916 a = s->anchor.ptr;
8917 } else if (s == NULL)
8918 action = pf_test_rule(&r, &s, kif, m, off, &pd,
8919 &a, &ruleset, inp);
8920 break;
8921 }
8922
8923 default:
8924 action = pf_test_state_other(&s, kif, m, &pd);
8925 if (action == PF_PASS) {
8926 if (V_pfsync_update_state_ptr != NULL)
8927 V_pfsync_update_state_ptr(s);
8928 r = s->rule.ptr;
8929 a = s->anchor.ptr;
8930 } else if (s == NULL)
8931 action = pf_test_rule(&r, &s, kif, m, off, &pd,
8932 &a, &ruleset, inp);
8933 break;
8934 }
8935
8936 done:
8937 PF_RULES_RUNLOCK();
8938 if (n != m) {
8939 m_freem(n);
8940 n = NULL;
8941 }
8942
8943 /* handle dangerous IPv6 extension headers. */
8944 if (action == PF_PASS && rh_cnt &&
8945 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
8946 action = PF_DROP;
8947 REASON_SET(&reason, PFRES_IPOPTIONS);
8948 pd.act.log = r->log;
8949 DPFPRINTF(PF_DEBUG_MISC,
8950 ("pf: dropping packet with dangerous v6 headers\n"));
8951 }
8952
8953 if (s) {
8954 uint8_t log = pd.act.log;
8955 memcpy(&pd.act, &s->act, sizeof(struct pf_rule_actions));
8956 pd.act.log |= log;
8957 tag = s->tag;
8958 rt = s->rt;
8959 } else {
8960 tag = r->tag;
8961 rt = r->rt;
8962 }
8963
8964 if (tag > 0 && pf_tag_packet(m, &pd, tag)) {
8965 action = PF_DROP;
8966 REASON_SET(&reason, PFRES_MEMORY);
8967 }
8968
8969 pf_scrub_ip6(&m, &pd);
8970 if (pd.proto == IPPROTO_TCP && pd.act.max_mss)
8971 pf_normalize_mss(m, off, &pd);
8972
8973 if (pd.act.rtableid >= 0)
8974 M_SETFIB(m, pd.act.rtableid);
8975
8976 if (pd.act.flags & PFSTATE_SETPRIO) {
8977 if (pd.tos & IPTOS_LOWDELAY)
8978 use_2nd_queue = 1;
8979 if (vlan_set_pcp(m, pd.act.set_prio[use_2nd_queue])) {
8980 action = PF_DROP;
8981 REASON_SET(&reason, PFRES_MEMORY);
8982 pd.act.log = PF_LOG_FORCE;
8983 DPFPRINTF(PF_DEBUG_MISC,
8984 ("pf: failed to allocate 802.1q mtag\n"));
8985 }
8986 }
8987
8988 #ifdef ALTQ
8989 if (action == PF_PASS && pd.act.qid) {
8990 if (pd.pf_mtag == NULL &&
8991 ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
8992 action = PF_DROP;
8993 REASON_SET(&reason, PFRES_MEMORY);
8994 } else {
8995 if (s != NULL)
8996 pd.pf_mtag->qid_hash = pf_state_hash(s);
8997 if (pd.tos & IPTOS_LOWDELAY)
8998 pd.pf_mtag->qid = pd.act.pqid;
8999 else
9000 pd.pf_mtag->qid = pd.act.qid;
9001 /* Add hints for ecn. */
9002 pd.pf_mtag->hdr = h;
9003 }
9004 }
9005 #endif /* ALTQ */
9006
9007 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
9008 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
9009 (s->nat_rule.ptr->action == PF_RDR ||
9010 s->nat_rule.ptr->action == PF_BINAT) &&
9011 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6))
9012 m->m_flags |= M_SKIP_FIREWALL;
9013
9014 /* XXX: Anybody working on it?! */
9015 if (r->divert.port)
9016 printf("pf: divert(9) is not supported for IPv6\n");
9017
9018 if (pd.act.log) {
9019 struct pf_krule *lr;
9020 struct pf_krule_item *ri;
9021
9022 if (s != NULL && s->nat_rule.ptr != NULL &&
9023 s->nat_rule.ptr->log & PF_LOG_ALL)
9024 lr = s->nat_rule.ptr;
9025 else
9026 lr = r;
9027
9028 if (pd.act.log & PF_LOG_FORCE || lr->log & PF_LOG_ALL)
9029 PFLOG_PACKET(kif, m, AF_INET6, action, reason, lr, a, ruleset,
9030 &pd, (s == NULL));
9031 if (s) {
9032 SLIST_FOREACH(ri, &s->match_rules, entry)
9033 if (ri->r->log & PF_LOG_ALL)
9034 PFLOG_PACKET(kif, m, AF_INET6, action, reason,
9035 ri->r, a, ruleset, &pd, 0);
9036 }
9037 }
9038
9039 pf_counter_u64_critical_enter();
9040 pf_counter_u64_add_protected(&kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS],
9041 pd.tot_len);
9042 pf_counter_u64_add_protected(&kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS],
9043 1);
9044
9045 if (action == PF_PASS || r->action == PF_DROP) {
9046 dirndx = (dir == PF_OUT);
9047 pf_counter_u64_add_protected(&r->packets[dirndx], 1);
9048 pf_counter_u64_add_protected(&r->bytes[dirndx], pd.tot_len);
9049 if (a != NULL) {
9050 pf_counter_u64_add_protected(&a->packets[dirndx], 1);
9051 pf_counter_u64_add_protected(&a->bytes[dirndx], pd.tot_len);
9052 }
9053 if (s != NULL) {
9054 if (s->nat_rule.ptr != NULL) {
9055 pf_counter_u64_add_protected(&s->nat_rule.ptr->packets[dirndx],
9056 1);
9057 pf_counter_u64_add_protected(&s->nat_rule.ptr->bytes[dirndx],
9058 pd.tot_len);
9059 }
9060 if (s->src_node != NULL) {
9061 counter_u64_add(s->src_node->packets[dirndx],
9062 1);
9063 counter_u64_add(s->src_node->bytes[dirndx],
9064 pd.tot_len);
9065 }
9066 if (s->nat_src_node != NULL) {
9067 counter_u64_add(s->nat_src_node->packets[dirndx],
9068 1);
9069 counter_u64_add(s->nat_src_node->bytes[dirndx],
9070 pd.tot_len);
9071 }
9072 dirndx = (dir == s->direction) ? 0 : 1;
9073 s->packets[dirndx]++;
9074 s->bytes[dirndx] += pd.tot_len;
9075 }
9076 tr = r;
9077 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
9078 if (nr != NULL && r == &V_pf_default_rule)
9079 tr = nr;
9080 if (tr->src.addr.type == PF_ADDR_TABLE)
9081 pfr_update_stats(tr->src.addr.p.tbl,
9082 (s == NULL) ? pd.src :
9083 &s->key[(s->direction == PF_IN)]->addr[0],
9084 pd.af, pd.tot_len, dir == PF_OUT,
9085 r->action == PF_PASS, tr->src.neg);
9086 if (tr->dst.addr.type == PF_ADDR_TABLE)
9087 pfr_update_stats(tr->dst.addr.p.tbl,
9088 (s == NULL) ? pd.dst :
9089 &s->key[(s->direction == PF_IN)]->addr[1],
9090 pd.af, pd.tot_len, dir == PF_OUT,
9091 r->action == PF_PASS, tr->dst.neg);
9092 }
9093 pf_counter_u64_critical_exit();
9094
9095 switch (action) {
9096 case PF_SYNPROXY_DROP:
9097 m_freem(*m0);
9098 case PF_DEFER:
9099 *m0 = NULL;
9100 action = PF_PASS;
9101 break;
9102 case PF_DROP:
9103 m_freem(*m0);
9104 *m0 = NULL;
9105 break;
9106 default:
9107 /* pf_route6() returns unlocked. */
9108 if (rt) {
9109 pf_route6(m0, r, kif->pfik_ifp, s, &pd, inp);
9110 goto out;
9111 }
9112 if (pf_dummynet(&pd, s, r, m0) != 0) {
9113 action = PF_DROP;
9114 REASON_SET(&reason, PFRES_MEMORY);
9115 }
9116 break;
9117 }
9118
9119 if (s && action != PF_DROP) {
9120 if (!s->if_index_in && dir == PF_IN)
9121 s->if_index_in = ifp->if_index;
9122 else if (!s->if_index_out && dir == PF_OUT)
9123 s->if_index_out = ifp->if_index;
9124 }
9125
9126 if (s)
9127 PF_STATE_UNLOCK(s);
9128
9129 /* If reassembled packet passed, create new fragments. */
9130 if (action == PF_PASS && *m0 && dir == PF_OUT &&
9131 (mtag = m_tag_find(m, PACKET_TAG_PF_REASSEMBLED, NULL)) != NULL)
9132 action = pf_refragment6(ifp, m0, mtag, pflags & PFIL_FWD);
9133
9134 out:
9135 SDT_PROBE4(pf, ip, test6, done, action, reason, r, s);
9136
9137 pf_sctp_multihome_delayed(&pd, off, kif, s, action);
9138
9139 return (action);
9140 }
9141 #endif /* INET6 */
9142