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