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