1 /* $OpenBSD: pf.c,v 1.552.2.1 2007/11/27 16:37:57 henning Exp $ */
2 /* add $OpenBSD: pf.c,v 1.553 2007/08/23 11:15:49 dhartmei Exp $ */
3 /* add $OpenBSD: pf.c,v 1.554 2007/08/28 16:09:12 henning Exp $ */
7 * Copyright (c) 2004 The DragonFly Project. All rights reserved.
9 * Copyright (c) 2001 Daniel Hartmeier
10 * Copyright (c) 2002,2003 Henning Brauer
11 * All rights reserved.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
17 * - Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials provided
22 * with the distribution.
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
25 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
26 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
27 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
28 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
29 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
30 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
31 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
32 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
34 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
37 * Effort sponsored in part by the Defense Advanced Research Projects
38 * Agency (DARPA) and Air Force Research Laboratory, Air Force
39 * Materiel Command, USAF, under agreement number F30602-01-2-0537.
44 #include "opt_inet6.h"
45 #include "use_pfsync.h"
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/malloc.h>
51 #include <sys/filio.h>
52 #include <sys/socket.h>
53 #include <sys/socketvar.h>
54 #include <sys/kernel.h>
56 #include <sys/sysctl.h>
57 #include <sys/endian.h>
58 #include <vm/vm_zone.h>
60 #include <sys/kthread.h>
62 #include <sys/mplock2.h>
64 #include <machine/inttypes.h>
67 #include <net/if_types.h>
69 #include <net/netisr.h>
70 #include <net/route.h>
72 #include <netinet/in.h>
73 #include <netinet/in_var.h>
74 #include <netinet/in_systm.h>
75 #include <netinet/ip.h>
76 #include <netinet/ip_var.h>
77 #include <netinet/tcp.h>
78 #include <netinet/tcp_seq.h>
79 #include <netinet/udp.h>
80 #include <netinet/ip_icmp.h>
81 #include <netinet/in_pcb.h>
82 #include <netinet/tcp_timer.h>
83 #include <netinet/tcp_var.h>
84 #include <netinet/udp_var.h>
85 #include <netinet/icmp_var.h>
86 #include <netinet/if_ether.h>
88 #include <net/pf/pfvar.h>
89 #include <net/pf/if_pflog.h>
92 #include <net/pf/if_pfsync.h>
93 #endif /* NPFSYNC > 0 */
96 #include <netinet/ip6.h>
97 #include <netinet/in_pcb.h>
98 #include <netinet/icmp6.h>
99 #include <netinet6/nd6.h>
100 #include <netinet6/ip6_var.h>
101 #include <netinet6/in6_pcb.h>
104 #include <sys/in_cksum.h>
105 #include <sys/ucred.h>
106 #include <machine/limits.h>
107 #include <sys/msgport2.h>
108 #include <net/netmsg2.h>
110 extern int ip_optcopy(struct ip *, struct ip *);
111 extern int debug_pfugidhack;
113 struct lwkt_token pf_token = LWKT_TOKEN_MP_INITIALIZER(pf_token);
115 #define DPFPRINTF(n, x) if (pf_status.debug >= (n)) kprintf x
122 struct pf_state_tree_lan_ext pf_statetbl_lan_ext;
123 struct pf_state_tree_ext_gwy pf_statetbl_ext_gwy;
125 struct pf_altqqueue pf_altqs[2];
126 struct pf_palist pf_pabuf;
127 struct pf_altqqueue *pf_altqs_active;
128 struct pf_altqqueue *pf_altqs_inactive;
129 struct pf_status pf_status;
131 u_int32_t ticket_altqs_active;
132 u_int32_t ticket_altqs_inactive;
133 int altqs_inactive_open;
134 u_int32_t ticket_pabuf;
136 struct pf_anchor_stackframe {
137 struct pf_ruleset *rs;
139 struct pf_anchor_node *parent;
140 struct pf_anchor *child;
141 } pf_anchor_stack[64];
143 vm_zone_t pf_src_tree_pl, pf_rule_pl, pf_pooladdr_pl;
144 vm_zone_t pf_state_pl, pf_state_key_pl;
145 vm_zone_t pf_altq_pl;
147 void pf_print_host(struct pf_addr *, u_int16_t, u_int8_t);
149 void pf_init_threshold(struct pf_threshold *, u_int32_t,
151 void pf_add_threshold(struct pf_threshold *);
152 int pf_check_threshold(struct pf_threshold *);
154 void pf_change_ap(struct pf_addr *, u_int16_t *,
155 u_int16_t *, u_int16_t *, struct pf_addr *,
156 u_int16_t, u_int8_t, sa_family_t);
157 int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *,
158 struct tcphdr *, struct pf_state_peer *);
160 void pf_change_a6(struct pf_addr *, u_int16_t *,
161 struct pf_addr *, u_int8_t);
163 void pf_change_icmp(struct pf_addr *, u_int16_t *,
164 struct pf_addr *, struct pf_addr *, u_int16_t,
165 u_int16_t *, u_int16_t *, u_int16_t *,
166 u_int16_t *, u_int8_t, sa_family_t);
167 void pf_send_tcp(const struct pf_rule *, sa_family_t,
168 const struct pf_addr *, const struct pf_addr *,
169 u_int16_t, u_int16_t, u_int32_t, u_int32_t,
170 u_int8_t, u_int16_t, u_int16_t, u_int8_t, int,
171 u_int16_t, struct ether_header *, struct ifnet *);
172 void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
173 sa_family_t, struct pf_rule *);
174 struct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *,
175 int, int, struct pfi_kif *,
176 struct pf_addr *, u_int16_t, struct pf_addr *,
178 struct pf_rule *pf_get_translation(struct pf_pdesc *, struct mbuf *,
179 int, int, struct pfi_kif *, struct pf_src_node **,
180 struct pf_addr *, u_int16_t,
181 struct pf_addr *, u_int16_t,
182 struct pf_addr *, u_int16_t *);
183 void pf_attach_state(struct pf_state_key *,
184 struct pf_state *, int);
185 void pf_detach_state(struct pf_state *, int);
186 int pf_test_rule(struct pf_rule **, struct pf_state **,
187 int, struct pfi_kif *, struct mbuf *, int,
188 void *, struct pf_pdesc *, struct pf_rule **,
189 struct pf_ruleset **, struct ifqueue *, struct inpcb *);
190 int pf_test_fragment(struct pf_rule **, int,
191 struct pfi_kif *, struct mbuf *, void *,
192 struct pf_pdesc *, struct pf_rule **,
193 struct pf_ruleset **);
194 int pf_test_state_tcp(struct pf_state **, int,
195 struct pfi_kif *, struct mbuf *, int,
196 void *, struct pf_pdesc *, u_short *);
197 int pf_test_state_udp(struct pf_state **, int,
198 struct pfi_kif *, struct mbuf *, int,
199 void *, struct pf_pdesc *);
200 int pf_test_state_icmp(struct pf_state **, int,
201 struct pfi_kif *, struct mbuf *, int,
202 void *, struct pf_pdesc *, u_short *);
203 int pf_test_state_other(struct pf_state **, int,
204 struct pfi_kif *, struct pf_pdesc *);
205 int pf_match_tag(struct mbuf *, struct pf_rule *, int *);
206 void pf_step_into_anchor(int *, struct pf_ruleset **, int,
207 struct pf_rule **, struct pf_rule **, int *);
208 int pf_step_out_of_anchor(int *, struct pf_ruleset **,
209 int, struct pf_rule **, struct pf_rule **,
211 void pf_hash(struct pf_addr *, struct pf_addr *,
212 struct pf_poolhashkey *, sa_family_t);
213 int pf_map_addr(u_int8_t, struct pf_rule *,
214 struct pf_addr *, struct pf_addr *,
215 struct pf_addr *, struct pf_src_node **);
216 int pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *,
217 struct pf_addr *, struct pf_addr *, u_int16_t,
218 struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t,
219 struct pf_src_node **);
220 void pf_route(struct mbuf **, struct pf_rule *, int,
221 struct ifnet *, struct pf_state *,
223 void pf_route6(struct mbuf **, struct pf_rule *, int,
224 struct ifnet *, struct pf_state *,
226 u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t,
228 u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t,
230 u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t,
232 void pf_set_rt_ifp(struct pf_state *,
234 int pf_check_proto_cksum(struct mbuf *, int, int,
235 u_int8_t, sa_family_t);
236 int pf_addr_wrap_neq(struct pf_addr_wrap *,
237 struct pf_addr_wrap *);
238 struct pf_state *pf_find_state(struct pfi_kif *,
239 struct pf_state_key_cmp *, u_int8_t);
240 int pf_src_connlimit(struct pf_state **);
241 void pf_stateins_err(const char *, struct pf_state *,
243 int pf_check_congestion(struct ifqueue *);
245 extern int pf_end_threads;
247 struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = {
248 { &pf_state_pl, PFSTATE_HIWAT },
249 { &pf_src_tree_pl, PFSNODE_HIWAT },
250 { &pf_frent_pl, PFFRAG_FRENT_HIWAT },
251 { &pfr_ktable_pl, PFR_KTABLE_HIWAT },
252 { &pfr_kentry_pl, PFR_KENTRY_HIWAT }
255 #define STATE_LOOKUP() \
257 if (direction == PF_IN) \
258 *state = pf_find_state(kif, &key, PF_EXT_GWY); \
260 *state = pf_find_state(kif, &key, PF_LAN_EXT); \
261 if (*state == NULL || (*state)->timeout == PFTM_PURGE) \
263 if (direction == PF_OUT && \
264 (((*state)->rule.ptr->rt == PF_ROUTETO && \
265 (*state)->rule.ptr->direction == PF_OUT) || \
266 ((*state)->rule.ptr->rt == PF_REPLYTO && \
267 (*state)->rule.ptr->direction == PF_IN)) && \
268 (*state)->rt_kif != NULL && \
269 (*state)->rt_kif != kif) \
273 #define STATE_TRANSLATE(sk) \
274 (sk)->lan.addr.addr32[0] != (sk)->gwy.addr.addr32[0] || \
275 ((sk)->af == AF_INET6 && \
276 ((sk)->lan.addr.addr32[1] != (sk)->gwy.addr.addr32[1] || \
277 (sk)->lan.addr.addr32[2] != (sk)->gwy.addr.addr32[2] || \
278 (sk)->lan.addr.addr32[3] != (sk)->gwy.addr.addr32[3])) || \
279 (sk)->lan.port != (sk)->gwy.port
281 #define BOUND_IFACE(r, k) \
282 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : pfi_all
284 #define STATE_INC_COUNTERS(s) \
286 s->rule.ptr->states++; \
287 if (s->anchor.ptr != NULL) \
288 s->anchor.ptr->states++; \
289 if (s->nat_rule.ptr != NULL) \
290 s->nat_rule.ptr->states++; \
293 #define STATE_DEC_COUNTERS(s) \
295 if (s->nat_rule.ptr != NULL) \
296 s->nat_rule.ptr->states--; \
297 if (s->anchor.ptr != NULL) \
298 s->anchor.ptr->states--; \
299 s->rule.ptr->states--; \
302 static __inline int pf_src_compare(struct pf_src_node *, struct pf_src_node *);
303 static __inline int pf_state_compare_lan_ext(struct pf_state_key *,
304 struct pf_state_key *);
305 static __inline int pf_state_compare_ext_gwy(struct pf_state_key *,
306 struct pf_state_key *);
307 static __inline int pf_state_compare_id(struct pf_state *,
310 struct pf_src_tree tree_src_tracking;
312 struct pf_state_tree_id tree_id;
313 struct pf_state_queue state_list;
315 RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare);
316 RB_GENERATE(pf_state_tree_lan_ext, pf_state_key,
317 entry_lan_ext, pf_state_compare_lan_ext);
318 RB_GENERATE(pf_state_tree_ext_gwy, pf_state_key,
319 entry_ext_gwy, pf_state_compare_ext_gwy);
320 RB_GENERATE(pf_state_tree_id, pf_state,
321 entry_id, pf_state_compare_id);
323 #define PF_DT_SKIP_LANEXT 0x01
324 #define PF_DT_SKIP_EXTGWY 0x02
327 pf_src_compare(struct pf_src_node *a, struct pf_src_node *b)
331 if (a->rule.ptr > b->rule.ptr)
333 if (a->rule.ptr < b->rule.ptr)
335 if ((diff = a->af - b->af) != 0)
340 if (a->addr.addr32[0] > b->addr.addr32[0])
342 if (a->addr.addr32[0] < b->addr.addr32[0])
348 if (a->addr.addr32[3] > b->addr.addr32[3])
350 if (a->addr.addr32[3] < b->addr.addr32[3])
352 if (a->addr.addr32[2] > b->addr.addr32[2])
354 if (a->addr.addr32[2] < b->addr.addr32[2])
356 if (a->addr.addr32[1] > b->addr.addr32[1])
358 if (a->addr.addr32[1] < b->addr.addr32[1])
360 if (a->addr.addr32[0] > b->addr.addr32[0])
362 if (a->addr.addr32[0] < b->addr.addr32[0])
371 pf_state_hash(struct pf_state_key *sk)
373 u_int32_t hv = (intptr_t)sk / sizeof(*sk);
375 hv ^= crc32(&sk->lan, sizeof(sk->lan));
376 hv ^= crc32(&sk->gwy, sizeof(sk->gwy));
377 hv ^= crc32(&sk->ext, sizeof(sk->ext));
378 if (hv == 0) /* disallow 0 */
384 pf_state_compare_lan_ext(struct pf_state_key *a, struct pf_state_key *b)
388 if ((diff = a->proto - b->proto) != 0)
390 if ((diff = a->af - b->af) != 0)
395 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0])
397 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0])
399 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
401 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
407 if (a->lan.addr.addr32[3] > b->lan.addr.addr32[3])
409 if (a->lan.addr.addr32[3] < b->lan.addr.addr32[3])
411 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3])
413 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3])
415 if (a->lan.addr.addr32[2] > b->lan.addr.addr32[2])
417 if (a->lan.addr.addr32[2] < b->lan.addr.addr32[2])
419 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2])
421 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2])
423 if (a->lan.addr.addr32[1] > b->lan.addr.addr32[1])
425 if (a->lan.addr.addr32[1] < b->lan.addr.addr32[1])
427 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1])
429 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1])
431 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0])
433 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0])
435 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
437 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
443 if ((diff = a->lan.port - b->lan.port) != 0)
445 if ((diff = a->ext.port - b->ext.port) != 0)
452 pf_state_compare_ext_gwy(struct pf_state_key *a, struct pf_state_key *b)
456 if ((diff = a->proto - b->proto) != 0)
458 if ((diff = a->af - b->af) != 0)
463 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
465 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
467 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0])
469 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0])
475 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3])
477 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3])
479 if (a->gwy.addr.addr32[3] > b->gwy.addr.addr32[3])
481 if (a->gwy.addr.addr32[3] < b->gwy.addr.addr32[3])
483 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2])
485 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2])
487 if (a->gwy.addr.addr32[2] > b->gwy.addr.addr32[2])
489 if (a->gwy.addr.addr32[2] < b->gwy.addr.addr32[2])
491 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1])
493 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1])
495 if (a->gwy.addr.addr32[1] > b->gwy.addr.addr32[1])
497 if (a->gwy.addr.addr32[1] < b->gwy.addr.addr32[1])
499 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
501 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
503 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0])
505 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0])
511 if ((diff = a->ext.port - b->ext.port) != 0)
513 if ((diff = a->gwy.port - b->gwy.port) != 0)
520 pf_state_compare_id(struct pf_state *a, struct pf_state *b)
526 if (a->creatorid > b->creatorid)
528 if (a->creatorid < b->creatorid)
536 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
541 dst->addr32[0] = src->addr32[0];
545 dst->addr32[0] = src->addr32[0];
546 dst->addr32[1] = src->addr32[1];
547 dst->addr32[2] = src->addr32[2];
548 dst->addr32[3] = src->addr32[3];
555 pf_find_state_byid(struct pf_state_cmp *key)
557 pf_status.fcounters[FCNT_STATE_SEARCH]++;
559 return (RB_FIND(pf_state_tree_id, &tree_id, (struct pf_state *)key));
563 pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int8_t tree)
565 struct pf_state_key *sk;
568 pf_status.fcounters[FCNT_STATE_SEARCH]++;
572 sk = RB_FIND(pf_state_tree_lan_ext, &pf_statetbl_lan_ext,
573 (struct pf_state_key *)key);
576 sk = RB_FIND(pf_state_tree_ext_gwy, &pf_statetbl_ext_gwy,
577 (struct pf_state_key *)key);
580 panic("pf_find_state");
583 /* list is sorted, if-bound states before floating ones */
585 TAILQ_FOREACH(s, &sk->states, next)
586 if (s->kif == pfi_all || s->kif == kif)
593 pf_find_state_all(struct pf_state_key_cmp *key, u_int8_t tree, int *more)
595 struct pf_state_key *sk;
596 struct pf_state *s, *ret = NULL;
598 pf_status.fcounters[FCNT_STATE_SEARCH]++;
602 sk = RB_FIND(pf_state_tree_lan_ext,
603 &pf_statetbl_lan_ext, (struct pf_state_key *)key);
606 sk = RB_FIND(pf_state_tree_ext_gwy,
607 &pf_statetbl_ext_gwy, (struct pf_state_key *)key);
610 panic("pf_find_state_all");
614 ret = TAILQ_FIRST(&sk->states);
618 TAILQ_FOREACH(s, &sk->states, next)
626 pf_init_threshold(struct pf_threshold *threshold,
627 u_int32_t limit, u_int32_t seconds)
629 threshold->limit = limit * PF_THRESHOLD_MULT;
630 threshold->seconds = seconds;
631 threshold->count = 0;
632 threshold->last = time_second;
636 pf_add_threshold(struct pf_threshold *threshold)
638 u_int32_t t = time_second, diff = t - threshold->last;
640 if (diff >= threshold->seconds)
641 threshold->count = 0;
643 threshold->count -= threshold->count * diff /
645 threshold->count += PF_THRESHOLD_MULT;
650 pf_check_threshold(struct pf_threshold *threshold)
652 return (threshold->count > threshold->limit);
656 pf_src_connlimit(struct pf_state **state)
660 (*state)->src_node->conn++;
661 (*state)->src.tcp_est = 1;
662 pf_add_threshold(&(*state)->src_node->conn_rate);
664 if ((*state)->rule.ptr->max_src_conn &&
665 (*state)->rule.ptr->max_src_conn <
666 (*state)->src_node->conn) {
667 pf_status.lcounters[LCNT_SRCCONN]++;
671 if ((*state)->rule.ptr->max_src_conn_rate.limit &&
672 pf_check_threshold(&(*state)->src_node->conn_rate)) {
673 pf_status.lcounters[LCNT_SRCCONNRATE]++;
680 if ((*state)->rule.ptr->overload_tbl) {
682 u_int32_t killed = 0;
684 pf_status.lcounters[LCNT_OVERLOAD_TABLE]++;
685 if (pf_status.debug >= PF_DEBUG_MISC) {
686 kprintf("pf_src_connlimit: blocking address ");
687 pf_print_host(&(*state)->src_node->addr, 0,
688 (*state)->state_key->af);
691 bzero(&p, sizeof(p));
692 p.pfra_af = (*state)->state_key->af;
693 switch ((*state)->state_key->af) {
697 p.pfra_ip4addr = (*state)->src_node->addr.v4;
703 p.pfra_ip6addr = (*state)->src_node->addr.v6;
708 pfr_insert_kentry((*state)->rule.ptr->overload_tbl,
711 /* kill existing states if that's required. */
712 if ((*state)->rule.ptr->flush) {
713 struct pf_state_key *sk;
716 pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++;
717 RB_FOREACH(st, pf_state_tree_id, &tree_id) {
720 * Kill states from this source. (Only those
721 * from the same rule if PF_FLUSH_GLOBAL is not
725 (*state)->state_key->af &&
726 (((*state)->state_key->direction ==
728 PF_AEQ(&(*state)->src_node->addr,
729 &sk->lan.addr, sk->af)) ||
730 ((*state)->state_key->direction == PF_IN &&
731 PF_AEQ(&(*state)->src_node->addr,
732 &sk->ext.addr, sk->af))) &&
733 ((*state)->rule.ptr->flush &
735 (*state)->rule.ptr == st->rule.ptr)) {
736 st->timeout = PFTM_PURGE;
737 st->src.state = st->dst.state =
742 if (pf_status.debug >= PF_DEBUG_MISC)
743 kprintf(", %u states killed", killed);
745 if (pf_status.debug >= PF_DEBUG_MISC)
749 /* kill this state */
750 (*state)->timeout = PFTM_PURGE;
751 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
756 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
757 struct pf_addr *src, sa_family_t af)
759 struct pf_src_node k;
763 PF_ACPY(&k.addr, src, af);
764 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
765 rule->rpool.opts & PF_POOL_STICKYADDR)
769 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
770 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
773 if (!rule->max_src_nodes ||
774 rule->src_nodes < rule->max_src_nodes)
775 (*sn) = pool_get(&pf_src_tree_pl, PR_NOWAIT);
777 pf_status.lcounters[LCNT_SRCNODES]++;
780 bzero(*sn, sizeof(struct pf_src_node));
782 pf_init_threshold(&(*sn)->conn_rate,
783 rule->max_src_conn_rate.limit,
784 rule->max_src_conn_rate.seconds);
787 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
788 rule->rpool.opts & PF_POOL_STICKYADDR)
789 (*sn)->rule.ptr = rule;
791 (*sn)->rule.ptr = NULL;
792 PF_ACPY(&(*sn)->addr, src, af);
793 if (RB_INSERT(pf_src_tree,
794 &tree_src_tracking, *sn) != NULL) {
795 if (pf_status.debug >= PF_DEBUG_MISC) {
796 kprintf("pf: src_tree insert failed: ");
797 pf_print_host(&(*sn)->addr, 0, af);
800 pool_put(&pf_src_tree_pl, *sn);
803 (*sn)->creation = time_second;
804 (*sn)->ruletype = rule->action;
805 if ((*sn)->rule.ptr != NULL)
806 (*sn)->rule.ptr->src_nodes++;
807 pf_status.scounters[SCNT_SRC_NODE_INSERT]++;
808 pf_status.src_nodes++;
810 if (rule->max_src_states &&
811 (*sn)->states >= rule->max_src_states) {
812 pf_status.lcounters[LCNT_SRCSTATES]++;
820 pf_stateins_err(const char *tree, struct pf_state *s, struct pfi_kif *kif)
822 struct pf_state_key *sk = s->state_key;
824 if (pf_status.debug >= PF_DEBUG_MISC) {
825 kprintf("pf: state insert failed: %s %s", tree, kif->pfik_name);
827 pf_print_host(&sk->lan.addr, sk->lan.port,
830 pf_print_host(&sk->gwy.addr, sk->gwy.port,
833 pf_print_host(&sk->ext.addr, sk->ext.port,
835 if (s->sync_flags & PFSTATE_FROMSYNC)
836 kprintf(" (from sync)");
842 pf_insert_state(struct pfi_kif *kif, struct pf_state *s)
844 struct pf_state_key *cur;
847 KKASSERT(s->state_key != NULL);
850 if ((cur = RB_INSERT(pf_state_tree_lan_ext, &pf_statetbl_lan_ext,
851 s->state_key)) != NULL) {
852 /* key exists. check for same kif, if none, add to key */
853 TAILQ_FOREACH(sp, &cur->states, next)
854 if (sp->kif == kif) { /* collision! */
855 pf_stateins_err("tree_lan_ext", s, kif);
857 PF_DT_SKIP_LANEXT|PF_DT_SKIP_EXTGWY);
860 pf_detach_state(s, PF_DT_SKIP_LANEXT|PF_DT_SKIP_EXTGWY);
861 pf_attach_state(cur, s, kif == pfi_all ? 1 : 0);
864 /* if cur != NULL, we already found a state key and attached to it */
865 if (cur == NULL && (cur = RB_INSERT(pf_state_tree_ext_gwy,
866 &pf_statetbl_ext_gwy, s->state_key)) != NULL) {
867 /* must not happen. we must have found the sk above! */
868 pf_stateins_err("tree_ext_gwy", s, kif);
869 pf_detach_state(s, PF_DT_SKIP_EXTGWY);
873 if (s->id == 0 && s->creatorid == 0) {
874 s->id = htobe64(pf_status.stateid++);
875 s->creatorid = pf_status.hostid;
877 if (RB_INSERT(pf_state_tree_id, &tree_id, s) != NULL) {
878 if (pf_status.debug >= PF_DEBUG_MISC) {
879 kprintf("pf: state insert failed: "
880 "id: %016jx creatorid: %08x",
881 (uintmax_t)be64toh(s->id), ntohl(s->creatorid));
882 if (s->sync_flags & PFSTATE_FROMSYNC)
883 kprintf(" (from sync)");
886 pf_detach_state(s, 0);
889 TAILQ_INSERT_TAIL(&state_list, s, entry_list);
890 pf_status.fcounters[FCNT_STATE_INSERT]++;
892 pfi_kif_ref(kif, PFI_KIF_REF_STATE);
894 pfsync_insert_state(s);
900 pf_purge_thread(void *v)
907 tsleep(pf_purge_thread, PWAIT, "pftm", 1 * hz);
909 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
911 if (pf_end_threads) {
912 pf_purge_expired_states(pf_status.states, 1);
913 pf_purge_expired_fragments();
914 pf_purge_expired_src_nodes(1);
917 lockmgr(&pf_consistency_lock, LK_RELEASE);
918 wakeup(pf_purge_thread);
923 /* process a fraction of the state table every second */
924 if(!pf_purge_expired_states(1 + (pf_status.states
925 / pf_default_rule.timeout[PFTM_INTERVAL]), 0)) {
927 pf_purge_expired_states(1 + (pf_status.states
928 / pf_default_rule.timeout[PFTM_INTERVAL]), 1);
931 /* purge other expired types every PFTM_INTERVAL seconds */
932 if (++nloops >= pf_default_rule.timeout[PFTM_INTERVAL]) {
933 pf_purge_expired_fragments();
934 if (!pf_purge_expired_src_nodes(locked)) {
935 pf_purge_expired_src_nodes(1);
940 lockmgr(&pf_consistency_lock, LK_RELEASE);
946 pf_state_expires(const struct pf_state *state)
953 /* handle all PFTM_* > PFTM_MAX here */
954 if (state->timeout == PFTM_PURGE)
955 return (time_second);
956 if (state->timeout == PFTM_UNTIL_PACKET)
958 KKASSERT(state->timeout != PFTM_UNLINKED);
959 KASSERT((state->timeout < PFTM_MAX),
960 ("pf_state_expires: timeout > PFTM_MAX"));
961 timeout = state->rule.ptr->timeout[state->timeout];
963 timeout = pf_default_rule.timeout[state->timeout];
964 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
966 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
967 states = state->rule.ptr->states;
969 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START];
970 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END];
971 states = pf_status.states;
973 if (end && states > start && start < end) {
975 return (state->expire + timeout * (end - states) /
978 return (time_second);
980 return (state->expire + timeout);
984 pf_purge_expired_src_nodes(int waslocked)
986 struct pf_src_node *cur, *next;
987 int locked = waslocked;
989 for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) {
990 next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur);
992 if (cur->states <= 0 && cur->expire <= time_second) {
994 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
995 next = RB_NEXT(pf_src_tree,
996 &tree_src_tracking, cur);
999 if (cur->rule.ptr != NULL) {
1000 cur->rule.ptr->src_nodes--;
1001 if (cur->rule.ptr->states <= 0 &&
1002 cur->rule.ptr->max_src_nodes <= 0)
1003 pf_rm_rule(NULL, cur->rule.ptr);
1005 RB_REMOVE(pf_src_tree, &tree_src_tracking, cur);
1006 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
1007 pf_status.src_nodes--;
1008 pool_put(&pf_src_tree_pl, cur);
1012 if (locked && !waslocked)
1013 lockmgr(&pf_consistency_lock, LK_RELEASE);
1018 pf_src_tree_remove_state(struct pf_state *s)
1022 if (s->src_node != NULL) {
1024 --s->src_node->conn;
1025 if (--s->src_node->states <= 0) {
1026 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
1029 pf_default_rule.timeout[PFTM_SRC_NODE];
1030 s->src_node->expire = time_second + timeout;
1033 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
1034 if (--s->nat_src_node->states <= 0) {
1035 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
1038 pf_default_rule.timeout[PFTM_SRC_NODE];
1039 s->nat_src_node->expire = time_second + timeout;
1042 s->src_node = s->nat_src_node = NULL;
1045 /* callers should be at crit_enter() */
1047 pf_unlink_state(struct pf_state *cur)
1049 if (cur->src.state == PF_TCPS_PROXY_DST) {
1050 pf_send_tcp(cur->rule.ptr, cur->state_key->af,
1051 &cur->state_key->ext.addr, &cur->state_key->lan.addr,
1052 cur->state_key->ext.port, cur->state_key->lan.port,
1053 cur->src.seqhi, cur->src.seqlo + 1,
1054 TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL);
1056 RB_REMOVE(pf_state_tree_id, &tree_id, cur);
1058 if (cur->creatorid == pf_status.hostid)
1059 pfsync_delete_state(cur);
1061 cur->timeout = PFTM_UNLINKED;
1062 pf_src_tree_remove_state(cur);
1063 pf_detach_state(cur, 0);
1066 /* callers should be at crit_enter() and hold the
1067 * write_lock on pf_consistency_lock */
1069 pf_free_state(struct pf_state *cur)
1072 if (pfsyncif != NULL &&
1073 (pfsyncif->sc_bulk_send_next == cur ||
1074 pfsyncif->sc_bulk_terminator == cur))
1077 KKASSERT(cur->timeout == PFTM_UNLINKED);
1078 if (--cur->rule.ptr->states <= 0 &&
1079 cur->rule.ptr->src_nodes <= 0)
1080 pf_rm_rule(NULL, cur->rule.ptr);
1081 if (cur->nat_rule.ptr != NULL)
1082 if (--cur->nat_rule.ptr->states <= 0 &&
1083 cur->nat_rule.ptr->src_nodes <= 0)
1084 pf_rm_rule(NULL, cur->nat_rule.ptr);
1085 if (cur->anchor.ptr != NULL)
1086 if (--cur->anchor.ptr->states <= 0)
1087 pf_rm_rule(NULL, cur->anchor.ptr);
1088 pf_normalize_tcp_cleanup(cur);
1089 pfi_kif_unref(cur->kif, PFI_KIF_REF_STATE);
1090 TAILQ_REMOVE(&state_list, cur, entry_list);
1092 pf_tag_unref(cur->tag);
1093 pool_put(&pf_state_pl, cur);
1094 pf_status.fcounters[FCNT_STATE_REMOVALS]++;
1099 pf_purge_expired_states(u_int32_t maxcheck, int waslocked)
1101 static struct pf_state *cur = NULL;
1102 struct pf_state *next;
1103 int locked = waslocked;
1105 while (maxcheck--) {
1106 /* wrap to start of list when we hit the end */
1108 cur = TAILQ_FIRST(&state_list);
1110 break; /* list empty */
1113 /* get next state, as cur may get deleted */
1114 next = TAILQ_NEXT(cur, entry_list);
1116 if (cur->timeout == PFTM_UNLINKED) {
1117 /* free unlinked state */
1119 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
1123 } else if (pf_state_expires(cur) <= time_second) {
1124 /* unlink and free expired state */
1125 pf_unlink_state(cur);
1127 if (!lockmgr(&pf_consistency_lock, LK_EXCLUSIVE))
1137 lockmgr(&pf_consistency_lock, LK_RELEASE);
1142 pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw)
1144 if (aw->type != PF_ADDR_TABLE)
1146 if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL)
1152 pf_tbladdr_remove(struct pf_addr_wrap *aw)
1154 if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL)
1156 pfr_detach_table(aw->p.tbl);
1161 pf_tbladdr_copyout(struct pf_addr_wrap *aw)
1163 struct pfr_ktable *kt = aw->p.tbl;
1165 if (aw->type != PF_ADDR_TABLE || kt == NULL)
1167 if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL)
1168 kt = kt->pfrkt_root;
1170 aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ?
1175 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
1180 u_int32_t a = ntohl(addr->addr32[0]);
1181 kprintf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
1193 u_int8_t i, curstart = 255, curend = 0,
1194 maxstart = 0, maxend = 0;
1195 for (i = 0; i < 8; i++) {
1196 if (!addr->addr16[i]) {
1197 if (curstart == 255)
1203 if ((curend - curstart) >
1204 (maxend - maxstart)) {
1205 maxstart = curstart;
1212 for (i = 0; i < 8; i++) {
1213 if (i >= maxstart && i <= maxend) {
1222 b = ntohs(addr->addr16[i]);
1239 pf_print_state(struct pf_state *s)
1241 struct pf_state_key *sk = s->state_key;
1242 switch (sk->proto) {
1252 case IPPROTO_ICMPV6:
1256 kprintf("%u ", sk->proto);
1259 pf_print_host(&sk->lan.addr, sk->lan.port, sk->af);
1261 pf_print_host(&sk->gwy.addr, sk->gwy.port, sk->af);
1263 pf_print_host(&sk->ext.addr, sk->ext.port, sk->af);
1264 kprintf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo,
1265 s->src.seqhi, s->src.max_win, s->src.seqdiff);
1266 if (s->src.wscale && s->dst.wscale)
1267 kprintf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK);
1269 kprintf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo,
1270 s->dst.seqhi, s->dst.max_win, s->dst.seqdiff);
1271 if (s->src.wscale && s->dst.wscale)
1272 kprintf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK);
1274 kprintf(" %u:%u", s->src.state, s->dst.state);
1278 pf_print_flags(u_int8_t f)
1300 #define PF_SET_SKIP_STEPS(i) \
1302 while (head[i] != cur) { \
1303 head[i]->skip[i].ptr = cur; \
1304 head[i] = TAILQ_NEXT(head[i], entries); \
1309 pf_calc_skip_steps(struct pf_rulequeue *rules)
1311 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
1314 cur = TAILQ_FIRST(rules);
1316 for (i = 0; i < PF_SKIP_COUNT; ++i)
1318 while (cur != NULL) {
1320 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
1321 PF_SET_SKIP_STEPS(PF_SKIP_IFP);
1322 if (cur->direction != prev->direction)
1323 PF_SET_SKIP_STEPS(PF_SKIP_DIR);
1324 if (cur->af != prev->af)
1325 PF_SET_SKIP_STEPS(PF_SKIP_AF);
1326 if (cur->proto != prev->proto)
1327 PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
1328 if (cur->src.neg != prev->src.neg ||
1329 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
1330 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
1331 if (cur->src.port[0] != prev->src.port[0] ||
1332 cur->src.port[1] != prev->src.port[1] ||
1333 cur->src.port_op != prev->src.port_op)
1334 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
1335 if (cur->dst.neg != prev->dst.neg ||
1336 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
1337 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
1338 if (cur->dst.port[0] != prev->dst.port[0] ||
1339 cur->dst.port[1] != prev->dst.port[1] ||
1340 cur->dst.port_op != prev->dst.port_op)
1341 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
1344 cur = TAILQ_NEXT(cur, entries);
1346 for (i = 0; i < PF_SKIP_COUNT; ++i)
1347 PF_SET_SKIP_STEPS(i);
1351 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
1353 if (aw1->type != aw2->type)
1355 switch (aw1->type) {
1356 case PF_ADDR_ADDRMASK:
1357 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0))
1359 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0))
1362 case PF_ADDR_DYNIFTL:
1363 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
1364 case PF_ADDR_NOROUTE:
1365 case PF_ADDR_URPFFAILED:
1368 return (aw1->p.tbl != aw2->p.tbl);
1369 case PF_ADDR_RTLABEL:
1370 return (aw1->v.rtlabel != aw2->v.rtlabel);
1372 kprintf("invalid address type: %d\n", aw1->type);
1378 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
1384 l = cksum + old - new;
1385 l = (l >> 16) + (l & 65535);
1393 pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc,
1394 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af)
1399 PF_ACPY(&ao, a, af);
1407 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1408 ao.addr16[0], an->addr16[0], 0),
1409 ao.addr16[1], an->addr16[1], 0);
1411 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1412 ao.addr16[0], an->addr16[0], u),
1413 ao.addr16[1], an->addr16[1], u),
1419 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1420 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1421 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1422 ao.addr16[0], an->addr16[0], u),
1423 ao.addr16[1], an->addr16[1], u),
1424 ao.addr16[2], an->addr16[2], u),
1425 ao.addr16[3], an->addr16[3], u),
1426 ao.addr16[4], an->addr16[4], u),
1427 ao.addr16[5], an->addr16[5], u),
1428 ao.addr16[6], an->addr16[6], u),
1429 ao.addr16[7], an->addr16[7], u),
1437 /* Changes a u_int32_t. Uses a void * so there are no align restrictions */
1439 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
1443 memcpy(&ao, a, sizeof(ao));
1444 memcpy(a, &an, sizeof(u_int32_t));
1445 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
1446 ao % 65536, an % 65536, u);
1451 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
1455 PF_ACPY(&ao, a, AF_INET6);
1456 PF_ACPY(a, an, AF_INET6);
1458 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1459 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1460 pf_cksum_fixup(pf_cksum_fixup(*c,
1461 ao.addr16[0], an->addr16[0], u),
1462 ao.addr16[1], an->addr16[1], u),
1463 ao.addr16[2], an->addr16[2], u),
1464 ao.addr16[3], an->addr16[3], u),
1465 ao.addr16[4], an->addr16[4], u),
1466 ao.addr16[5], an->addr16[5], u),
1467 ao.addr16[6], an->addr16[6], u),
1468 ao.addr16[7], an->addr16[7], u);
1473 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
1474 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
1475 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
1477 struct pf_addr oia, ooa;
1479 PF_ACPY(&oia, ia, af);
1480 PF_ACPY(&ooa, oa, af);
1482 /* Change inner protocol port, fix inner protocol checksum. */
1484 u_int16_t oip = *ip;
1491 *pc = pf_cksum_fixup(*pc, oip, *ip, u);
1492 *ic = pf_cksum_fixup(*ic, oip, *ip, 0);
1494 *ic = pf_cksum_fixup(*ic, opc, *pc, 0);
1496 /* Change inner ip address, fix inner ip and icmp checksums. */
1497 PF_ACPY(ia, na, af);
1501 u_int32_t oh2c = *h2c;
1503 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
1504 oia.addr16[0], ia->addr16[0], 0),
1505 oia.addr16[1], ia->addr16[1], 0);
1506 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1507 oia.addr16[0], ia->addr16[0], 0),
1508 oia.addr16[1], ia->addr16[1], 0);
1509 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
1515 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1516 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1517 pf_cksum_fixup(pf_cksum_fixup(*ic,
1518 oia.addr16[0], ia->addr16[0], u),
1519 oia.addr16[1], ia->addr16[1], u),
1520 oia.addr16[2], ia->addr16[2], u),
1521 oia.addr16[3], ia->addr16[3], u),
1522 oia.addr16[4], ia->addr16[4], u),
1523 oia.addr16[5], ia->addr16[5], u),
1524 oia.addr16[6], ia->addr16[6], u),
1525 oia.addr16[7], ia->addr16[7], u);
1529 /* Change outer ip address, fix outer ip or icmpv6 checksum. */
1530 PF_ACPY(oa, na, af);
1534 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
1535 ooa.addr16[0], oa->addr16[0], 0),
1536 ooa.addr16[1], oa->addr16[1], 0);
1541 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1542 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1543 pf_cksum_fixup(pf_cksum_fixup(*ic,
1544 ooa.addr16[0], oa->addr16[0], u),
1545 ooa.addr16[1], oa->addr16[1], u),
1546 ooa.addr16[2], oa->addr16[2], u),
1547 ooa.addr16[3], oa->addr16[3], u),
1548 ooa.addr16[4], oa->addr16[4], u),
1549 ooa.addr16[5], oa->addr16[5], u),
1550 ooa.addr16[6], oa->addr16[6], u),
1551 ooa.addr16[7], oa->addr16[7], u);
1559 * Need to modulate the sequence numbers in the TCP SACK option
1560 * (credits to Krzysztof Pfaff for report and patch)
1563 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd,
1564 struct tcphdr *th, struct pf_state_peer *dst)
1566 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen;
1567 u_int8_t opts[TCP_MAXOLEN], *opt = opts;
1568 int copyback = 0, i, olen;
1569 struct raw_sackblock sack;
1571 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2)
1572 if (hlen < TCPOLEN_SACKLEN ||
1573 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af))
1576 while (hlen >= TCPOLEN_SACKLEN) {
1579 case TCPOPT_EOL: /* FALLTHROUGH */
1587 if (olen >= TCPOLEN_SACKLEN) {
1588 for (i = 2; i + TCPOLEN_SACK <= olen;
1589 i += TCPOLEN_SACK) {
1590 memcpy(&sack, &opt[i], sizeof(sack));
1591 pf_change_a(&sack.rblk_start, &th->th_sum,
1592 htonl(ntohl(sack.rblk_start) -
1594 pf_change_a(&sack.rblk_end, &th->th_sum,
1595 htonl(ntohl(sack.rblk_end) -
1597 memcpy(&opt[i], &sack, sizeof(sack));
1611 m_copyback(m, off + sizeof(*th), thoptlen, opts);
1616 pf_send_tcp(const struct pf_rule *r, sa_family_t af,
1617 const struct pf_addr *saddr, const struct pf_addr *daddr,
1618 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
1619 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag,
1620 u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp)
1625 struct ip *h = NULL;
1628 struct ip6_hdr *h6 = NULL;
1630 struct tcphdr *th = NULL;
1633 ASSERT_LWKT_TOKEN_HELD(&pf_token);
1635 /* maximum segment size tcp option */
1636 tlen = sizeof(struct tcphdr);
1643 len = sizeof(struct ip) + tlen;
1648 len = sizeof(struct ip6_hdr) + tlen;
1653 /* create outgoing mbuf */
1654 m = m_gethdr(MB_DONTWAIT, MT_HEADER);
1659 m->m_pkthdr.pf.flags |= PF_TAG_GENERATED;
1660 m->m_pkthdr.pf.tag = rtag;
1662 if (r != NULL && r->rtableid >= 0)
1663 m->m_pkthdr.pf.rtableid = r->rtableid;
1666 if (r != NULL && r->qid) {
1667 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
1668 m->m_pkthdr.pf.qid = r->qid;
1669 m->m_pkthdr.pf.ecn_af = af;
1670 m->m_pkthdr.pf.hdr = mtod(m, struct ip *);
1673 m->m_data += max_linkhdr;
1674 m->m_pkthdr.len = m->m_len = len;
1675 m->m_pkthdr.rcvif = NULL;
1676 bzero(m->m_data, len);
1680 h = mtod(m, struct ip *);
1682 /* IP header fields included in the TCP checksum */
1683 h->ip_p = IPPROTO_TCP;
1685 h->ip_src.s_addr = saddr->v4.s_addr;
1686 h->ip_dst.s_addr = daddr->v4.s_addr;
1688 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
1693 h6 = mtod(m, struct ip6_hdr *);
1695 /* IP header fields included in the TCP checksum */
1696 h6->ip6_nxt = IPPROTO_TCP;
1697 h6->ip6_plen = htons(tlen);
1698 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
1699 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
1701 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
1707 th->th_sport = sport;
1708 th->th_dport = dport;
1709 th->th_seq = htonl(seq);
1710 th->th_ack = htonl(ack);
1711 th->th_off = tlen >> 2;
1712 th->th_flags = flags;
1713 th->th_win = htons(win);
1716 opt = (char *)(th + 1);
1717 opt[0] = TCPOPT_MAXSEG;
1720 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
1727 th->th_sum = in_cksum(m, len);
1729 /* Finish the IP header */
1731 h->ip_hl = sizeof(*h) >> 2;
1732 h->ip_tos = IPTOS_LOWDELAY;
1734 h->ip_off = path_mtu_discovery ? IP_DF : 0;
1735 h->ip_ttl = ttl ? ttl : ip_defttl;
1738 lwkt_reltoken(&pf_token);
1739 ip_output(m, NULL, NULL, 0, NULL, NULL);
1740 lwkt_gettoken(&pf_token);
1744 struct ether_header *e = (void *)ro.ro_dst.sa_data;
1752 ro.ro_dst.sa_len = sizeof(ro.ro_dst);
1753 ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT;
1754 bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN);
1755 bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN);
1756 e->ether_type = eh->ether_type;
1757 /* XXX_IMPORT: later */
1758 lwkt_reltoken(&pf_token);
1759 ip_output(m, (void *)NULL, &ro, 0,
1760 (void *)NULL, (void *)NULL);
1761 lwkt_gettoken(&pf_token);
1768 th->th_sum = in6_cksum(m, IPPROTO_TCP,
1769 sizeof(struct ip6_hdr), tlen);
1771 h6->ip6_vfc |= IPV6_VERSION;
1772 h6->ip6_hlim = IPV6_DEFHLIM;
1774 lwkt_reltoken(&pf_token);
1775 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
1776 lwkt_gettoken(&pf_token);
1783 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
1788 m0 = m_copy(m, 0, M_COPYALL);
1789 m0->m_pkthdr.pf.flags |= PF_TAG_GENERATED;
1791 if (r->rtableid >= 0)
1792 m0->m_pkthdr.pf.rtableid = r->rtableid;
1796 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
1797 m0->m_pkthdr.pf.qid = r->qid;
1798 m0->m_pkthdr.pf.ecn_af = af;
1799 m0->m_pkthdr.pf.hdr = mtod(m0, struct ip *);
1806 icmp_error(m0, type, code, 0, 0);
1811 icmp6_error(m0, type, code, 0);
1818 * Return 1 if the addresses a and b match (with mask m), otherwise return 0.
1819 * If n is 0, they match if they are equal. If n is != 0, they match if they
1823 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
1824 struct pf_addr *b, sa_family_t af)
1831 if ((a->addr32[0] & m->addr32[0]) ==
1832 (b->addr32[0] & m->addr32[0]))
1838 if (((a->addr32[0] & m->addr32[0]) ==
1839 (b->addr32[0] & m->addr32[0])) &&
1840 ((a->addr32[1] & m->addr32[1]) ==
1841 (b->addr32[1] & m->addr32[1])) &&
1842 ((a->addr32[2] & m->addr32[2]) ==
1843 (b->addr32[2] & m->addr32[2])) &&
1844 ((a->addr32[3] & m->addr32[3]) ==
1845 (b->addr32[3] & m->addr32[3])))
1864 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
1868 return ((p > a1) && (p < a2));
1870 return ((p < a1) || (p > a2));
1872 return ((p >= a1) && (p <= a2));
1886 return (0); /* never reached */
1890 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
1895 return (pf_match(op, a1, a2, p));
1899 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
1901 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
1903 return (pf_match(op, a1, a2, u));
1907 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
1909 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
1911 return (pf_match(op, a1, a2, g));
1915 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag)
1918 *tag = m->m_pkthdr.pf.tag;
1920 return ((!r->match_tag_not && r->match_tag == *tag) ||
1921 (r->match_tag_not && r->match_tag != *tag));
1925 pf_tag_packet(struct mbuf *m, int tag, int rtableid)
1927 if (tag <= 0 && rtableid < 0)
1931 m->m_pkthdr.pf.tag = tag;
1933 m->m_pkthdr.pf.rtableid = rtableid;
1939 pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n,
1940 struct pf_rule **r, struct pf_rule **a, int *match)
1942 struct pf_anchor_stackframe *f;
1944 (*r)->anchor->match = 0;
1947 if (*depth >= sizeof(pf_anchor_stack) /
1948 sizeof(pf_anchor_stack[0])) {
1949 kprintf("pf_step_into_anchor: stack overflow\n");
1950 *r = TAILQ_NEXT(*r, entries);
1952 } else if (*depth == 0 && a != NULL)
1954 f = pf_anchor_stack + (*depth)++;
1957 if ((*r)->anchor_wildcard) {
1958 f->parent = &(*r)->anchor->children;
1959 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) ==
1964 *rs = &f->child->ruleset;
1968 *rs = &(*r)->anchor->ruleset;
1970 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
1974 pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n,
1975 struct pf_rule **r, struct pf_rule **a, int *match)
1977 struct pf_anchor_stackframe *f;
1983 f = pf_anchor_stack + *depth - 1;
1984 if (f->parent != NULL && f->child != NULL) {
1985 if (f->child->match ||
1986 (match != NULL && *match)) {
1987 f->r->anchor->match = 1;
1990 f->child = RB_NEXT(pf_anchor_node, f->parent, f->child);
1991 if (f->child != NULL) {
1992 *rs = &f->child->ruleset;
1993 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2001 if (*depth == 0 && a != NULL)
2004 if (f->r->anchor->match || (match != NULL && *match))
2005 quick = f->r->quick;
2006 *r = TAILQ_NEXT(f->r, entries);
2007 } while (*r == NULL);
2014 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
2015 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
2020 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2021 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2025 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2026 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2027 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
2028 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
2029 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
2030 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
2031 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
2032 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
2038 pf_addr_inc(struct pf_addr *addr, sa_family_t af)
2043 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
2047 if (addr->addr32[3] == 0xffffffff) {
2048 addr->addr32[3] = 0;
2049 if (addr->addr32[2] == 0xffffffff) {
2050 addr->addr32[2] = 0;
2051 if (addr->addr32[1] == 0xffffffff) {
2052 addr->addr32[1] = 0;
2054 htonl(ntohl(addr->addr32[0]) + 1);
2057 htonl(ntohl(addr->addr32[1]) + 1);
2060 htonl(ntohl(addr->addr32[2]) + 1);
2063 htonl(ntohl(addr->addr32[3]) + 1);
2069 #define mix(a,b,c) \
2071 a -= b; a -= c; a ^= (c >> 13); \
2072 b -= c; b -= a; b ^= (a << 8); \
2073 c -= a; c -= b; c ^= (b >> 13); \
2074 a -= b; a -= c; a ^= (c >> 12); \
2075 b -= c; b -= a; b ^= (a << 16); \
2076 c -= a; c -= b; c ^= (b >> 5); \
2077 a -= b; a -= c; a ^= (c >> 3); \
2078 b -= c; b -= a; b ^= (a << 10); \
2079 c -= a; c -= b; c ^= (b >> 15); \
2083 * hash function based on bridge_hash in if_bridge.c
2086 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash,
2087 struct pf_poolhashkey *key, sa_family_t af)
2089 u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0];
2094 a += inaddr->addr32[0];
2097 hash->addr32[0] = c + key->key32[2];
2102 a += inaddr->addr32[0];
2103 b += inaddr->addr32[2];
2105 hash->addr32[0] = c;
2106 a += inaddr->addr32[1];
2107 b += inaddr->addr32[3];
2110 hash->addr32[1] = c;
2111 a += inaddr->addr32[2];
2112 b += inaddr->addr32[1];
2115 hash->addr32[2] = c;
2116 a += inaddr->addr32[3];
2117 b += inaddr->addr32[0];
2120 hash->addr32[3] = c;
2127 pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr,
2128 struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn)
2130 unsigned char hash[16];
2131 struct pf_pool *rpool = &r->rpool;
2132 struct pf_addr *raddr = &rpool->cur->addr.v.a.addr;
2133 struct pf_addr *rmask = &rpool->cur->addr.v.a.mask;
2134 struct pf_pooladdr *acur = rpool->cur;
2135 struct pf_src_node k;
2137 if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR &&
2138 (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
2140 PF_ACPY(&k.addr, saddr, af);
2141 if (r->rule_flag & PFRULE_RULESRCTRACK ||
2142 r->rpool.opts & PF_POOL_STICKYADDR)
2146 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
2147 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
2148 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) {
2149 PF_ACPY(naddr, &(*sn)->raddr, af);
2150 if (pf_status.debug >= PF_DEBUG_MISC) {
2151 kprintf("pf_map_addr: src tracking maps ");
2152 pf_print_host(&k.addr, 0, af);
2154 pf_print_host(naddr, 0, af);
2161 if (rpool->cur->addr.type == PF_ADDR_NOROUTE)
2163 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
2167 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
2168 (rpool->opts & PF_POOL_TYPEMASK) !=
2171 raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
2172 rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
2177 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
2178 (rpool->opts & PF_POOL_TYPEMASK) !=
2181 raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
2182 rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
2186 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
2187 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN)
2188 return (1); /* unsupported */
2190 raddr = &rpool->cur->addr.v.a.addr;
2191 rmask = &rpool->cur->addr.v.a.mask;
2194 switch (rpool->opts & PF_POOL_TYPEMASK) {
2196 PF_ACPY(naddr, raddr, af);
2198 case PF_POOL_BITMASK:
2199 PF_POOLMASK(naddr, raddr, rmask, saddr, af);
2201 case PF_POOL_RANDOM:
2202 if (init_addr != NULL && PF_AZERO(init_addr, af)) {
2206 rpool->counter.addr32[0] = htonl(karc4random());
2211 if (rmask->addr32[3] != 0xffffffff)
2212 rpool->counter.addr32[3] =
2213 htonl(karc4random());
2216 if (rmask->addr32[2] != 0xffffffff)
2217 rpool->counter.addr32[2] =
2218 htonl(karc4random());
2221 if (rmask->addr32[1] != 0xffffffff)
2222 rpool->counter.addr32[1] =
2223 htonl(karc4random());
2226 if (rmask->addr32[0] != 0xffffffff)
2227 rpool->counter.addr32[0] =
2228 htonl(karc4random());
2232 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
2233 PF_ACPY(init_addr, naddr, af);
2236 PF_AINC(&rpool->counter, af);
2237 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
2240 case PF_POOL_SRCHASH:
2241 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af);
2242 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af);
2244 case PF_POOL_ROUNDROBIN:
2245 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
2246 if (!pfr_pool_get(rpool->cur->addr.p.tbl,
2247 &rpool->tblidx, &rpool->counter,
2248 &raddr, &rmask, af))
2250 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
2251 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
2252 &rpool->tblidx, &rpool->counter,
2253 &raddr, &rmask, af))
2255 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
2259 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL)
2260 rpool->cur = TAILQ_FIRST(&rpool->list);
2261 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
2263 if (pfr_pool_get(rpool->cur->addr.p.tbl,
2264 &rpool->tblidx, &rpool->counter,
2265 &raddr, &rmask, af)) {
2266 /* table contains no address of type 'af' */
2267 if (rpool->cur != acur)
2271 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
2273 if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
2274 &rpool->tblidx, &rpool->counter,
2275 &raddr, &rmask, af)) {
2276 /* table contains no address of type 'af' */
2277 if (rpool->cur != acur)
2282 raddr = &rpool->cur->addr.v.a.addr;
2283 rmask = &rpool->cur->addr.v.a.mask;
2284 PF_ACPY(&rpool->counter, raddr, af);
2288 PF_ACPY(naddr, &rpool->counter, af);
2289 if (init_addr != NULL && PF_AZERO(init_addr, af))
2290 PF_ACPY(init_addr, naddr, af);
2291 PF_AINC(&rpool->counter, af);
2295 PF_ACPY(&(*sn)->raddr, naddr, af);
2297 if (pf_status.debug >= PF_DEBUG_MISC &&
2298 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
2299 kprintf("pf_map_addr: selected address ");
2300 pf_print_host(naddr, 0, af);
2308 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r,
2309 struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport,
2310 struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high,
2311 struct pf_src_node **sn)
2313 struct pf_state_key_cmp key;
2314 struct pf_addr init_addr;
2317 bzero(&init_addr, sizeof(init_addr));
2318 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
2321 if (proto == IPPROTO_ICMP) {
2329 PF_ACPY(&key.ext.addr, daddr, key.af);
2330 PF_ACPY(&key.gwy.addr, naddr, key.af);
2331 key.ext.port = dport;
2334 * port search; start random, step;
2335 * similar 2 portloop in in_pcbbind
2337 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP ||
2338 proto == IPPROTO_ICMP)) {
2339 key.gwy.port = dport;
2340 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL)
2342 } else if (low == 0 && high == 0) {
2343 key.gwy.port = *nport;
2344 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL)
2346 } else if (low == high) {
2347 key.gwy.port = htons(low);
2348 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) {
2349 *nport = htons(low);
2361 cut = htonl(karc4random()) % (1 + high - low) + low;
2362 /* low <= cut <= high */
2363 for (tmp = cut; tmp <= high; ++(tmp)) {
2364 key.gwy.port = htons(tmp);
2365 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) ==
2367 *nport = htons(tmp);
2371 for (tmp = cut - 1; tmp >= low; --(tmp)) {
2372 key.gwy.port = htons(tmp);
2373 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) ==
2375 *nport = htons(tmp);
2381 switch (r->rpool.opts & PF_POOL_TYPEMASK) {
2382 case PF_POOL_RANDOM:
2383 case PF_POOL_ROUNDROBIN:
2384 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
2388 case PF_POOL_SRCHASH:
2389 case PF_POOL_BITMASK:
2393 } while (! PF_AEQ(&init_addr, naddr, af) );
2395 return (1); /* none available */
2399 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
2400 int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport,
2401 struct pf_addr *daddr, u_int16_t dport, int rs_num)
2403 struct pf_rule *r, *rm = NULL;
2404 struct pf_ruleset *ruleset = NULL;
2409 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr);
2410 while (r && rm == NULL) {
2411 struct pf_rule_addr *src = NULL, *dst = NULL;
2412 struct pf_addr_wrap *xdst = NULL;
2414 if (r->action == PF_BINAT && direction == PF_IN) {
2416 if (r->rpool.cur != NULL)
2417 xdst = &r->rpool.cur->addr;
2424 if (pfi_kif_match(r->kif, kif) == r->ifnot)
2425 r = r->skip[PF_SKIP_IFP].ptr;
2426 else if (r->direction && r->direction != direction)
2427 r = r->skip[PF_SKIP_DIR].ptr;
2428 else if (r->af && r->af != pd->af)
2429 r = r->skip[PF_SKIP_AF].ptr;
2430 else if (r->proto && r->proto != pd->proto)
2431 r = r->skip[PF_SKIP_PROTO].ptr;
2432 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af,
2434 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR :
2435 PF_SKIP_DST_ADDR].ptr;
2436 else if (src->port_op && !pf_match_port(src->port_op,
2437 src->port[0], src->port[1], sport))
2438 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT :
2439 PF_SKIP_DST_PORT].ptr;
2440 else if (dst != NULL &&
2441 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL))
2442 r = r->skip[PF_SKIP_DST_ADDR].ptr;
2443 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af,
2445 r = TAILQ_NEXT(r, entries);
2446 else if (dst != NULL && dst->port_op &&
2447 !pf_match_port(dst->port_op, dst->port[0],
2448 dst->port[1], dport))
2449 r = r->skip[PF_SKIP_DST_PORT].ptr;
2450 else if (r->match_tag && !pf_match_tag(m, r, &tag))
2451 r = TAILQ_NEXT(r, entries);
2452 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto !=
2453 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m,
2454 off, pd->hdr.tcp), r->os_fingerprint)))
2455 r = TAILQ_NEXT(r, entries);
2459 if (r->rtableid >= 0)
2460 rtableid = r->rtableid;
2461 if (r->anchor == NULL) {
2464 pf_step_into_anchor(&asd, &ruleset, rs_num,
2468 pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r,
2471 if (pf_tag_packet(m, tag, rtableid))
2473 if (rm != NULL && (rm->action == PF_NONAT ||
2474 rm->action == PF_NORDR || rm->action == PF_NOBINAT))
2480 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction,
2481 struct pfi_kif *kif, struct pf_src_node **sn,
2482 struct pf_addr *saddr, u_int16_t sport,
2483 struct pf_addr *daddr, u_int16_t dport,
2484 struct pf_addr *naddr, u_int16_t *nport)
2486 struct pf_rule *r = NULL;
2488 if (direction == PF_OUT) {
2489 r = pf_match_translation(pd, m, off, direction, kif, saddr,
2490 sport, daddr, dport, PF_RULESET_BINAT);
2492 r = pf_match_translation(pd, m, off, direction, kif,
2493 saddr, sport, daddr, dport, PF_RULESET_NAT);
2495 r = pf_match_translation(pd, m, off, direction, kif, saddr,
2496 sport, daddr, dport, PF_RULESET_RDR);
2498 r = pf_match_translation(pd, m, off, direction, kif,
2499 saddr, sport, daddr, dport, PF_RULESET_BINAT);
2503 switch (r->action) {
2509 if (pf_get_sport(pd->af, pd->proto, r, saddr,
2510 daddr, dport, naddr, nport, r->rpool.proxy_port[0],
2511 r->rpool.proxy_port[1], sn)) {
2512 DPFPRINTF(PF_DEBUG_MISC,
2513 ("pf: NAT proxy port allocation "
2515 r->rpool.proxy_port[0],
2516 r->rpool.proxy_port[1]));
2521 switch (direction) {
2523 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){
2527 if (r->rpool.cur->addr.p.dyn->
2531 &r->rpool.cur->addr.p.dyn->
2533 &r->rpool.cur->addr.p.dyn->
2540 if (r->rpool.cur->addr.p.dyn->
2544 &r->rpool.cur->addr.p.dyn->
2546 &r->rpool.cur->addr.p.dyn->
2554 &r->rpool.cur->addr.v.a.addr,
2555 &r->rpool.cur->addr.v.a.mask,
2559 if (r->src.addr.type == PF_ADDR_DYNIFTL) {
2563 if (r->src.addr.p.dyn->
2567 &r->src.addr.p.dyn->
2569 &r->src.addr.p.dyn->
2576 if (r->src.addr.p.dyn->
2580 &r->src.addr.p.dyn->
2582 &r->src.addr.p.dyn->
2590 &r->src.addr.v.a.addr,
2591 &r->src.addr.v.a.mask, daddr,
2597 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn))
2599 if ((r->rpool.opts & PF_POOL_TYPEMASK) ==
2601 PF_POOLMASK(naddr, naddr,
2602 &r->rpool.cur->addr.v.a.mask, daddr,
2605 if (r->rpool.proxy_port[1]) {
2606 u_int32_t tmp_nport;
2608 tmp_nport = ((ntohs(dport) -
2609 ntohs(r->dst.port[0])) %
2610 (r->rpool.proxy_port[1] -
2611 r->rpool.proxy_port[0] + 1)) +
2612 r->rpool.proxy_port[0];
2614 /* wrap around if necessary */
2615 if (tmp_nport > 65535)
2617 *nport = htons((u_int16_t)tmp_nport);
2618 } else if (r->rpool.proxy_port[0])
2619 *nport = htons(r->rpool.proxy_port[0]);
2631 struct netmsg_hashlookup {
2632 struct netmsg_base base;
2633 struct inpcb **nm_pinp;
2634 struct inpcbinfo *nm_pcbinfo;
2635 struct pf_addr *nm_saddr;
2636 struct pf_addr *nm_daddr;
2643 in_pcblookup_hash_handler(netmsg_t msg)
2645 struct netmsg_hashlookup *rmsg = (struct netmsg_hashlookup *)msg;
2647 if (rmsg->nm_af == AF_INET)
2648 *rmsg->nm_pinp = in_pcblookup_hash(rmsg->nm_pcbinfo,
2649 rmsg->nm_saddr->v4, rmsg->nm_sport, rmsg->nm_daddr->v4,
2650 rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL);
2653 *rmsg->nm_pinp = in6_pcblookup_hash(rmsg->nm_pcbinfo,
2654 &rmsg->nm_saddr->v6, rmsg->nm_sport, &rmsg->nm_daddr->v6,
2655 rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL);
2657 lwkt_replymsg(&rmsg->base.lmsg, 0);
2662 pf_socket_lookup(int direction, struct pf_pdesc *pd)
2664 struct pf_addr *saddr, *daddr;
2665 u_int16_t sport, dport;
2666 struct inpcbinfo *pi;
2669 struct netmsg_hashlookup *msg = NULL;
2675 pd->lookup.uid = UID_MAX;
2676 pd->lookup.gid = GID_MAX;
2677 pd->lookup.pid = NO_PID;
2678 if (direction == PF_IN) {
2685 switch (pd->proto) {
2687 if (pd->hdr.tcp == NULL)
2689 sport = pd->hdr.tcp->th_sport;
2690 dport = pd->hdr.tcp->th_dport;
2692 pi_cpu = tcp_addrcpu(saddr->v4.s_addr, sport, daddr->v4.s_addr, dport);
2693 pi = &tcbinfo[pi_cpu];
2696 * Our netstack runs lockless on MP systems
2697 * (only for TCP connections at the moment).
2699 * As we are not allowed to read another CPU's tcbinfo,
2700 * we have to ask that CPU via remote call to search the
2703 * Prepare a msg iff data belongs to another CPU.
2705 if (pi_cpu != mycpu->gd_cpuid) {
2706 msg = kmalloc(sizeof(*msg), M_LWKTMSG, M_INTWAIT);
2707 netmsg_init(&msg->base, NULL, &netisr_afree_rport,
2708 0, in_pcblookup_hash_handler);
2709 msg->nm_pinp = &inp;
2710 msg->nm_pcbinfo = pi;
2711 msg->nm_saddr = saddr;
2712 msg->nm_sport = sport;
2713 msg->nm_daddr = daddr;
2714 msg->nm_dport = dport;
2715 msg->nm_af = pd->af;
2720 if (pd->hdr.udp == NULL)
2722 sport = pd->hdr.udp->uh_sport;
2723 dport = pd->hdr.udp->uh_dport;
2729 if (direction != PF_IN) {
2741 * Query other CPU, second part
2743 * msg only gets initialized when:
2745 * 2) the info belongs to another CPU
2747 * Use some switch/case magic to avoid code duplication.
2752 inp = in6_pcblookup_hash(pi, &saddr->v6, sport,
2753 &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL);
2759 /* FALLTHROUGH if SMP and on other CPU */
2764 lwkt_domsg(cpu_portfn(pi_cpu),
2765 &msg->base.lmsg, 0);
2769 inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4,
2770 dport, INPLOOKUP_WILDCARD, NULL);
2779 pd->lookup.uid = inp->inp_socket->so_cred->cr_uid;
2780 pd->lookup.gid = inp->inp_socket->so_cred->cr_groups[0];
2785 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
2789 u_int8_t *opt, optlen;
2790 u_int8_t wscale = 0;
2792 hlen = th_off << 2; /* hlen <= sizeof(hdr) */
2793 if (hlen <= sizeof(struct tcphdr))
2795 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
2797 opt = hdr + sizeof(struct tcphdr);
2798 hlen -= sizeof(struct tcphdr);
2808 if (wscale > TCP_MAX_WINSHIFT)
2809 wscale = TCP_MAX_WINSHIFT;
2810 wscale |= PF_WSCALE_FLAG;
2825 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
2829 u_int8_t *opt, optlen;
2830 u_int16_t mss = tcp_mssdflt;
2832 hlen = th_off << 2; /* hlen <= sizeof(hdr) */
2833 if (hlen <= sizeof(struct tcphdr))
2835 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
2837 opt = hdr + sizeof(struct tcphdr);
2838 hlen -= sizeof(struct tcphdr);
2839 while (hlen >= TCPOLEN_MAXSEG) {
2847 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
2862 pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer)
2865 struct sockaddr_in *dst;
2869 struct sockaddr_in6 *dst6;
2870 struct route_in6 ro6;
2872 struct rtentry *rt = NULL;
2874 u_int16_t mss = tcp_mssdflt;
2879 hlen = sizeof(struct ip);
2880 bzero(&ro, sizeof(ro));
2881 dst = (struct sockaddr_in *)&ro.ro_dst;
2882 dst->sin_family = AF_INET;
2883 dst->sin_len = sizeof(*dst);
2884 dst->sin_addr = addr->v4;
2885 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING));
2891 hlen = sizeof(struct ip6_hdr);
2892 bzero(&ro6, sizeof(ro6));
2893 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst;
2894 dst6->sin6_family = AF_INET6;
2895 dst6->sin6_len = sizeof(*dst6);
2896 dst6->sin6_addr = addr->v6;
2897 rtalloc_ign((struct route *)&ro6, (RTF_CLONING | RTF_PRCLONING));
2903 if (rt && rt->rt_ifp) {
2904 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr);
2905 mss = max(tcp_mssdflt, mss);
2908 mss = min(mss, offer);
2909 mss = max(mss, 64); /* sanity - at least max opt space */
2914 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr)
2916 struct pf_rule *r = s->rule.ptr;
2919 if (!r->rt || r->rt == PF_FASTROUTE)
2921 switch (s->state_key->af) {
2924 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL,
2926 s->rt_kif = r->rpool.cur->kif;
2931 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL,
2933 s->rt_kif = r->rpool.cur->kif;
2940 pf_attach_state(struct pf_state_key *sk, struct pf_state *s, int tail)
2945 /* list is sorted, if-bound states before floating */
2947 TAILQ_INSERT_TAIL(&sk->states, s, next);
2949 TAILQ_INSERT_HEAD(&sk->states, s, next);
2953 pf_detach_state(struct pf_state *s, int flags)
2955 struct pf_state_key *sk = s->state_key;
2960 s->state_key = NULL;
2961 TAILQ_REMOVE(&sk->states, s, next);
2962 if (--sk->refcnt == 0) {
2963 if (!(flags & PF_DT_SKIP_EXTGWY))
2964 RB_REMOVE(pf_state_tree_ext_gwy,
2965 &pf_statetbl_ext_gwy, sk);
2966 if (!(flags & PF_DT_SKIP_LANEXT))
2967 RB_REMOVE(pf_state_tree_lan_ext,
2968 &pf_statetbl_lan_ext, sk);
2969 pool_put(&pf_state_key_pl, sk);
2973 struct pf_state_key *
2974 pf_alloc_state_key(struct pf_state *s)
2976 struct pf_state_key *sk;
2978 if ((sk = pool_get(&pf_state_key_pl, PR_NOWAIT)) == NULL)
2980 bzero(sk, sizeof(*sk));
2981 TAILQ_INIT(&sk->states);
2982 pf_attach_state(sk, s, 0);
2988 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction,
2989 struct pfi_kif *kif, struct mbuf *m, int off, void *h,
2990 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm,
2991 struct ifqueue *ifq, struct inpcb *inp)
2993 struct pf_rule *nr = NULL;
2994 struct pf_addr *saddr = pd->src, *daddr = pd->dst;
2995 u_int16_t bport, nport = 0;
2996 sa_family_t af = pd->af;
2997 struct pf_rule *r, *a = NULL;
2998 struct pf_ruleset *ruleset = NULL;
2999 struct pf_src_node *nsn = NULL;
3000 struct tcphdr *th = pd->hdr.tcp;
3002 int rewrite = 0, hdrlen = 0;
3003 int tag = -1, rtableid = -1;
3007 u_int16_t mss = tcp_mssdflt;
3008 u_int16_t sport, dport;
3009 u_int8_t icmptype = 0, icmpcode = 0;
3011 if (direction == PF_IN && pf_check_congestion(ifq)) {
3012 REASON_SET(&reason, PFRES_CONGEST);
3017 pd->lookup.done = pf_socket_lookup(direction, pd);
3018 else if (debug_pfugidhack) {
3019 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n"));
3020 pd->lookup.done = pf_socket_lookup(direction, pd);
3023 sport = dport = hdrlen = 0;
3025 switch (pd->proto) {
3027 sport = th->th_sport;
3028 dport = th->th_dport;
3029 hdrlen = sizeof(*th);
3032 sport = pd->hdr.udp->uh_sport;
3033 dport = pd->hdr.udp->uh_dport;
3034 hdrlen = sizeof(*pd->hdr.udp);
3038 if (pd->af != AF_INET)
3040 sport = dport = pd->hdr.icmp->icmp_id;
3041 icmptype = pd->hdr.icmp->icmp_type;
3042 icmpcode = pd->hdr.icmp->icmp_code;
3044 if (icmptype == ICMP_UNREACH ||
3045 icmptype == ICMP_SOURCEQUENCH ||
3046 icmptype == ICMP_REDIRECT ||
3047 icmptype == ICMP_TIMXCEED ||
3048 icmptype == ICMP_PARAMPROB)
3053 case IPPROTO_ICMPV6:
3054 if (pd->af != AF_INET6)
3056 sport = dport = pd->hdr.icmp6->icmp6_id;
3057 hdrlen = sizeof(*pd->hdr.icmp6);
3058 icmptype = pd->hdr.icmp6->icmp6_type;
3059 icmpcode = pd->hdr.icmp6->icmp6_code;
3061 if (icmptype == ICMP6_DST_UNREACH ||
3062 icmptype == ICMP6_PACKET_TOO_BIG ||
3063 icmptype == ICMP6_TIME_EXCEEDED ||
3064 icmptype == ICMP6_PARAM_PROB)
3070 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3072 if (direction == PF_OUT) {
3073 bport = nport = sport;
3074 /* check outgoing packet for BINAT/NAT */
3075 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
3076 saddr, sport, daddr, dport, &pd->naddr, &nport)) != NULL) {
3077 PF_ACPY(&pd->baddr, saddr, af);
3078 switch (pd->proto) {
3080 pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
3081 &th->th_sum, &pd->naddr, nport, 0, af);
3082 sport = th->th_sport;
3086 pf_change_ap(saddr, &pd->hdr.udp->uh_sport,
3087 pd->ip_sum, &pd->hdr.udp->uh_sum,
3088 &pd->naddr, nport, 1, af);
3089 sport = pd->hdr.udp->uh_sport;
3094 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3095 pd->naddr.v4.s_addr, 0);
3096 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup(
3097 pd->hdr.icmp->icmp_cksum, sport, nport, 0);
3098 pd->hdr.icmp->icmp_id = nport;
3099 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
3103 case IPPROTO_ICMPV6:
3104 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
3113 pf_change_a(&saddr->v4.s_addr,
3114 pd->ip_sum, pd->naddr.v4.s_addr, 0);
3119 PF_ACPY(saddr, &pd->naddr, af);
3131 bport = nport = dport;
3132 /* check incoming packet for BINAT/RDR */
3133 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
3134 saddr, sport, daddr, dport, &pd->naddr, &nport)) != NULL) {
3135 PF_ACPY(&pd->baddr, daddr, af);
3136 switch (pd->proto) {
3138 pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
3139 &th->th_sum, &pd->naddr, nport, 0, af);
3140 dport = th->th_dport;
3144 pf_change_ap(daddr, &pd->hdr.udp->uh_dport,
3145 pd->ip_sum, &pd->hdr.udp->uh_sum,
3146 &pd->naddr, nport, 1, af);
3147 dport = pd->hdr.udp->uh_dport;
3152 pf_change_a(&daddr->v4.s_addr, pd->ip_sum,
3153 pd->naddr.v4.s_addr, 0);
3157 case IPPROTO_ICMPV6:
3158 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
3167 pf_change_a(&daddr->v4.s_addr,
3168 pd->ip_sum, pd->naddr.v4.s_addr, 0);
3173 PF_ACPY(daddr, &pd->naddr, af);
3188 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3189 r = r->skip[PF_SKIP_IFP].ptr;
3190 else if (r->direction && r->direction != direction)
3191 r = r->skip[PF_SKIP_DIR].ptr;
3192 else if (r->af && r->af != af)
3193 r = r->skip[PF_SKIP_AF].ptr;
3194 else if (r->proto && r->proto != pd->proto)
3195 r = r->skip[PF_SKIP_PROTO].ptr;
3196 else if (PF_MISMATCHAW(&r->src.addr, saddr, af,
3198 r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3199 /* tcp/udp only. port_op always 0 in other cases */
3200 else if (r->src.port_op && !pf_match_port(r->src.port_op,
3201 r->src.port[0], r->src.port[1], sport))
3202 r = r->skip[PF_SKIP_SRC_PORT].ptr;
3203 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af,
3205 r = r->skip[PF_SKIP_DST_ADDR].ptr;
3206 /* tcp/udp only. port_op always 0 in other cases */
3207 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
3208 r->dst.port[0], r->dst.port[1], dport))
3209 r = r->skip[PF_SKIP_DST_PORT].ptr;
3210 /* icmp only. type always 0 in other cases */
3211 else if (r->type && r->type != icmptype + 1)
3212 r = TAILQ_NEXT(r, entries);
3213 /* icmp only. type always 0 in other cases */
3214 else if (r->code && r->code != icmpcode + 1)
3215 r = TAILQ_NEXT(r, entries);
3216 else if (r->tos && !(r->tos == pd->tos))
3217 r = TAILQ_NEXT(r, entries);
3218 else if (r->rule_flag & PFRULE_FRAGMENT)
3219 r = TAILQ_NEXT(r, entries);
3220 else if (pd->proto == IPPROTO_TCP &&
3221 (r->flagset & th->th_flags) != r->flags)
3222 r = TAILQ_NEXT(r, entries);
3223 /* tcp/udp only. uid.op always 0 in other cases */
3224 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done =
3225 pf_socket_lookup(direction, pd), 1)) &&
3226 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
3228 r = TAILQ_NEXT(r, entries);
3229 /* tcp/udp only. gid.op always 0 in other cases */
3230 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done =
3231 pf_socket_lookup(direction, pd), 1)) &&
3232 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
3234 r = TAILQ_NEXT(r, entries);
3235 else if (r->prob && r->prob <= karc4random())
3236 r = TAILQ_NEXT(r, entries);
3237 else if (r->match_tag && !pf_match_tag(m, r, &tag))
3238 r = TAILQ_NEXT(r, entries);
3239 else if (r->os_fingerprint != PF_OSFP_ANY &&
3240 (pd->proto != IPPROTO_TCP || !pf_osfp_match(
3241 pf_osfp_fingerprint(pd, m, off, th),
3242 r->os_fingerprint)))
3243 r = TAILQ_NEXT(r, entries);
3247 if (r->rtableid >= 0)
3248 rtableid = r->rtableid;
3249 if (r->anchor == NULL) {
3256 r = TAILQ_NEXT(r, entries);
3258 pf_step_into_anchor(&asd, &ruleset,
3259 PF_RULESET_FILTER, &r, &a, &match);
3261 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
3262 PF_RULESET_FILTER, &r, &a, &match))
3269 REASON_SET(&reason, PFRES_MATCH);
3271 if (r->log || (nr != NULL && nr->log)) {
3273 m_copyback(m, off, hdrlen, pd->hdr.any);
3274 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr,
3278 if ((r->action == PF_DROP) &&
3279 ((r->rule_flag & PFRULE_RETURNRST) ||
3280 (r->rule_flag & PFRULE_RETURNICMP) ||
3281 (r->rule_flag & PFRULE_RETURN))) {
3282 /* undo NAT changes, if they have taken place */
3284 if (direction == PF_OUT) {
3285 switch (pd->proto) {
3287 pf_change_ap(saddr, &th->th_sport,
3288 pd->ip_sum, &th->th_sum,
3289 &pd->baddr, bport, 0, af);
3290 sport = th->th_sport;
3295 &pd->hdr.udp->uh_sport, pd->ip_sum,
3296 &pd->hdr.udp->uh_sum, &pd->baddr,
3298 sport = pd->hdr.udp->uh_sport;
3303 case IPPROTO_ICMPV6:
3310 pf_change_a(&saddr->v4.s_addr,
3312 pd->baddr.v4.s_addr, 0);
3315 PF_ACPY(saddr, &pd->baddr, af);
3320 switch (pd->proto) {
3322 pf_change_ap(daddr, &th->th_dport,
3323 pd->ip_sum, &th->th_sum,
3324 &pd->baddr, bport, 0, af);
3325 dport = th->th_dport;
3330 &pd->hdr.udp->uh_dport, pd->ip_sum,
3331 &pd->hdr.udp->uh_sum, &pd->baddr,
3333 dport = pd->hdr.udp->uh_dport;
3338 case IPPROTO_ICMPV6:
3345 pf_change_a(&daddr->v4.s_addr,
3347 pd->baddr.v4.s_addr, 0);
3350 PF_ACPY(daddr, &pd->baddr, af);
3356 if (pd->proto == IPPROTO_TCP &&
3357 ((r->rule_flag & PFRULE_RETURNRST) ||
3358 (r->rule_flag & PFRULE_RETURN)) &&
3359 !(th->th_flags & TH_RST)) {
3360 u_int32_t ack = ntohl(th->th_seq) + pd->p_len;
3361 struct ip *h = mtod(m, struct ip *);
3363 if (pf_check_proto_cksum(m, off,
3364 h->ip_len - off, IPPROTO_TCP, AF_INET))
3365 REASON_SET(&reason, PFRES_PROTCKSUM);
3367 if (th->th_flags & TH_SYN)
3369 if (th->th_flags & TH_FIN)
3371 pf_send_tcp(r, af, pd->dst,
3372 pd->src, th->th_dport, th->th_sport,
3373 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
3374 r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp);
3376 } else if ((af == AF_INET) && r->return_icmp)
3377 pf_send_icmp(m, r->return_icmp >> 8,
3378 r->return_icmp & 255, af, r);
3379 else if ((af == AF_INET6) && r->return_icmp6)
3380 pf_send_icmp(m, r->return_icmp6 >> 8,
3381 r->return_icmp6 & 255, af, r);
3384 if (r->action == PF_DROP)
3387 if (pf_tag_packet(m, tag, rtableid)) {
3388 REASON_SET(&reason, PFRES_MEMORY);
3392 if (!state_icmp && (r->keep_state || nr != NULL ||
3393 (pd->flags & PFDESC_TCP_NORM))) {
3394 /* create new state */
3396 struct pf_state *s = NULL;
3397 struct pf_state_key *sk = NULL;
3398 struct pf_src_node *sn = NULL;
3400 /* check maximums */
3401 if (r->max_states && (r->states >= r->max_states)) {
3402 pf_status.lcounters[LCNT_STATES]++;
3403 REASON_SET(&reason, PFRES_MAXSTATES);
3406 /* src node for filter rule */
3407 if ((r->rule_flag & PFRULE_SRCTRACK ||
3408 r->rpool.opts & PF_POOL_STICKYADDR) &&
3409 pf_insert_src_node(&sn, r, saddr, af) != 0) {
3410 REASON_SET(&reason, PFRES_SRCLIMIT);
3413 /* src node for translation rule */
3414 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3415 ((direction == PF_OUT &&
3416 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
3417 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) {
3418 REASON_SET(&reason, PFRES_SRCLIMIT);
3421 s = pool_get(&pf_state_pl, PR_NOWAIT);
3423 REASON_SET(&reason, PFRES_MEMORY);
3425 if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3426 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3427 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3428 pf_status.src_nodes--;
3429 pool_put(&pf_src_tree_pl, sn);
3431 if (nsn != sn && nsn != NULL && nsn->states == 0 &&
3433 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3434 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3435 pf_status.src_nodes--;
3436 pool_put(&pf_src_tree_pl, nsn);
3439 pool_put(&pf_state_key_pl, sk);
3443 bzero(s, sizeof(*s));
3445 s->nat_rule.ptr = nr;
3447 STATE_INC_COUNTERS(s);
3448 s->allow_opts = r->allow_opts;
3449 s->log = r->log & PF_LOG_ALL;
3451 s->log |= nr->log & PF_LOG_ALL;
3452 switch (pd->proto) {
3454 len = pd->tot_len - off - (th->th_off << 2);
3455 s->src.seqlo = ntohl(th->th_seq);
3456 s->src.seqhi = s->src.seqlo + len + 1;
3457 if ((th->th_flags & (TH_SYN|TH_ACK)) ==
3458 TH_SYN && r->keep_state == PF_STATE_MODULATE) {
3459 /* Generate sequence number modulator */
3460 while ((s->src.seqdiff =
3461 pf_new_isn(sk) - s->src.seqlo) == 0)
3463 pf_change_a(&th->th_seq, &th->th_sum,
3464 htonl(s->src.seqlo + s->src.seqdiff), 0);
3468 if (th->th_flags & TH_SYN) {
3470 s->src.wscale = pf_get_wscale(m, off,
3473 s->src.max_win = MAX(ntohs(th->th_win), 1);
3474 if (s->src.wscale & PF_WSCALE_MASK) {
3475 /* Remove scale factor from initial window */
3476 int win = s->src.max_win;
3477 win += 1 << (s->src.wscale & PF_WSCALE_MASK);
3478 s->src.max_win = (win - 1) >>
3479 (s->src.wscale & PF_WSCALE_MASK);
3481 if (th->th_flags & TH_FIN)
3485 s->src.state = TCPS_SYN_SENT;
3486 s->dst.state = TCPS_CLOSED;
3487 s->timeout = PFTM_TCP_FIRST_PACKET;
3490 s->src.state = PFUDPS_SINGLE;
3491 s->dst.state = PFUDPS_NO_TRAFFIC;
3492 s->timeout = PFTM_UDP_FIRST_PACKET;
3496 case IPPROTO_ICMPV6:
3498 s->timeout = PFTM_ICMP_FIRST_PACKET;
3501 s->src.state = PFOTHERS_SINGLE;
3502 s->dst.state = PFOTHERS_NO_TRAFFIC;
3503 s->timeout = PFTM_OTHER_FIRST_PACKET;
3506 s->creation = time_second;
3507 s->expire = time_second;
3511 s->src_node->states++;
3514 PF_ACPY(&nsn->raddr, &pd->naddr, af);
3515 s->nat_src_node = nsn;
3516 s->nat_src_node->states++;
3518 if (pd->proto == IPPROTO_TCP) {
3519 if ((pd->flags & PFDESC_TCP_NORM) &&
3520 pf_normalize_tcp_init(m, off, pd, th, &s->src,
3522 REASON_SET(&reason, PFRES_MEMORY);
3523 pf_src_tree_remove_state(s);
3524 STATE_DEC_COUNTERS(s);
3525 pool_put(&pf_state_pl, s);
3528 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
3529 pf_normalize_tcp_stateful(m, off, pd, &reason,
3530 th, s, &s->src, &s->dst, &rewrite)) {
3531 /* This really shouldn't happen!!! */
3532 DPFPRINTF(PF_DEBUG_URGENT,
3533 ("pf_normalize_tcp_stateful failed on "
3535 pf_normalize_tcp_cleanup(s);
3536 pf_src_tree_remove_state(s);
3537 STATE_DEC_COUNTERS(s);
3538 pool_put(&pf_state_pl, s);
3543 if ((sk = pf_alloc_state_key(s)) == NULL) {
3544 REASON_SET(&reason, PFRES_MEMORY);
3548 sk->proto = pd->proto;
3549 sk->direction = direction;
3551 if (direction == PF_OUT) {
3552 PF_ACPY(&sk->gwy.addr, saddr, af);
3553 PF_ACPY(&sk->ext.addr, daddr, af);
3554 switch (pd->proto) {
3557 case IPPROTO_ICMPV6:
3559 sk->gwy.port = nport;
3563 sk->gwy.port = sport;
3564 sk->ext.port = dport;
3567 PF_ACPY(&sk->lan.addr, &pd->baddr, af);
3568 sk->lan.port = bport;
3570 PF_ACPY(&sk->lan.addr, &sk->gwy.addr, af);
3571 sk->lan.port = sk->gwy.port;
3574 PF_ACPY(&sk->lan.addr, daddr, af);
3575 PF_ACPY(&sk->ext.addr, saddr, af);
3576 switch (pd->proto) {
3579 case IPPROTO_ICMPV6:
3581 sk->lan.port = nport;
3585 sk->lan.port = dport;
3586 sk->ext.port = sport;
3589 PF_ACPY(&sk->gwy.addr, &pd->baddr, af);
3590 sk->gwy.port = bport;
3592 PF_ACPY(&sk->gwy.addr, &sk->lan.addr, af);
3593 sk->gwy.port = sk->lan.port;
3597 s->hash = pf_state_hash(sk);
3598 s->pickup_mode = r->pickup_mode;
3600 pf_set_rt_ifp(s, saddr); /* needs s->state_key set */
3602 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
3603 if (pd->proto == IPPROTO_TCP)
3604 pf_normalize_tcp_cleanup(s);
3605 REASON_SET(&reason, PFRES_STATEINS);
3606 pf_src_tree_remove_state(s);
3607 STATE_DEC_COUNTERS(s);
3608 pool_put(&pf_state_pl, s);
3616 if (pd->proto == IPPROTO_TCP &&
3617 (th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
3618 r->keep_state == PF_STATE_SYNPROXY) {
3619 s->src.state = PF_TCPS_PROXY_SRC;
3621 if (direction == PF_OUT) {
3622 pf_change_ap(saddr, &th->th_sport,
3623 pd->ip_sum, &th->th_sum, &pd->baddr,
3625 sport = th->th_sport;
3627 pf_change_ap(daddr, &th->th_dport,
3628 pd->ip_sum, &th->th_sum, &pd->baddr,
3630 sport = th->th_dport;
3633 s->src.seqhi = htonl(karc4random());
3634 /* Find mss option */
3635 mss = pf_get_mss(m, off, th->th_off, af);
3636 mss = pf_calc_mss(saddr, af, mss);
3637 mss = pf_calc_mss(daddr, af, mss);
3639 pf_send_tcp(r, af, daddr, saddr, th->th_dport,
3640 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
3641 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL);
3642 REASON_SET(&reason, PFRES_SYNPROXY);
3643 return (PF_SYNPROXY_DROP);
3647 /* copy back packet headers if we performed NAT operations */
3649 m_copyback(m, off, hdrlen, pd->hdr.any);
3655 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
3656 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
3657 struct pf_ruleset **rsm)
3659 struct pf_rule *r, *a = NULL;
3660 struct pf_ruleset *ruleset = NULL;
3661 sa_family_t af = pd->af;
3667 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3670 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3671 r = r->skip[PF_SKIP_IFP].ptr;
3672 else if (r->direction && r->direction != direction)
3673 r = r->skip[PF_SKIP_DIR].ptr;
3674 else if (r->af && r->af != af)
3675 r = r->skip[PF_SKIP_AF].ptr;
3676 else if (r->proto && r->proto != pd->proto)
3677 r = r->skip[PF_SKIP_PROTO].ptr;
3678 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af,
3680 r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3681 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af,
3683 r = r->skip[PF_SKIP_DST_ADDR].ptr;
3684 else if (r->tos && !(r->tos == pd->tos))
3685 r = TAILQ_NEXT(r, entries);
3686 else if (r->os_fingerprint != PF_OSFP_ANY)
3687 r = TAILQ_NEXT(r, entries);
3688 else if (pd->proto == IPPROTO_UDP &&
3689 (r->src.port_op || r->dst.port_op))
3690 r = TAILQ_NEXT(r, entries);
3691 else if (pd->proto == IPPROTO_TCP &&
3692 (r->src.port_op || r->dst.port_op || r->flagset))
3693 r = TAILQ_NEXT(r, entries);
3694 else if ((pd->proto == IPPROTO_ICMP ||
3695 pd->proto == IPPROTO_ICMPV6) &&
3696 (r->type || r->code))
3697 r = TAILQ_NEXT(r, entries);
3698 else if (r->prob && r->prob <= karc4random())
3699 r = TAILQ_NEXT(r, entries);
3700 else if (r->match_tag && !pf_match_tag(m, r, &tag))
3701 r = TAILQ_NEXT(r, entries);
3703 if (r->anchor == NULL) {
3710 r = TAILQ_NEXT(r, entries);
3712 pf_step_into_anchor(&asd, &ruleset,
3713 PF_RULESET_FILTER, &r, &a, &match);
3715 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
3716 PF_RULESET_FILTER, &r, &a, &match))
3723 REASON_SET(&reason, PFRES_MATCH);
3726 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset,
3729 if (r->action != PF_PASS)
3732 if (pf_tag_packet(m, tag, -1)) {
3733 REASON_SET(&reason, PFRES_MEMORY);
3741 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
3742 struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
3745 struct pf_state_key_cmp key;
3746 struct tcphdr *th = pd->hdr.tcp;
3747 u_int16_t win = ntohs(th->th_win);
3748 u_int32_t ack, end, seq, orig_seq;
3752 struct pf_state_peer *src, *dst;
3755 key.proto = IPPROTO_TCP;
3756 if (direction == PF_IN) {
3757 PF_ACPY(&key.ext.addr, pd->src, key.af);
3758 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
3759 key.ext.port = th->th_sport;
3760 key.gwy.port = th->th_dport;
3762 PF_ACPY(&key.lan.addr, pd->src, key.af);
3763 PF_ACPY(&key.ext.addr, pd->dst, key.af);
3764 key.lan.port = th->th_sport;
3765 key.ext.port = th->th_dport;
3770 if (direction == (*state)->state_key->direction) {
3771 src = &(*state)->src;
3772 dst = &(*state)->dst;
3774 src = &(*state)->dst;
3775 dst = &(*state)->src;
3778 if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
3779 if (direction != (*state)->state_key->direction) {
3780 REASON_SET(reason, PFRES_SYNPROXY);
3781 return (PF_SYNPROXY_DROP);
3783 if (th->th_flags & TH_SYN) {
3784 if (ntohl(th->th_seq) != (*state)->src.seqlo) {
3785 REASON_SET(reason, PFRES_SYNPROXY);
3788 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
3789 pd->src, th->th_dport, th->th_sport,
3790 (*state)->src.seqhi, ntohl(th->th_seq) + 1,
3791 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1,
3793 REASON_SET(reason, PFRES_SYNPROXY);
3794 return (PF_SYNPROXY_DROP);
3795 } else if (!(th->th_flags & TH_ACK) ||
3796 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
3797 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
3798 REASON_SET(reason, PFRES_SYNPROXY);
3800 } else if ((*state)->src_node != NULL &&
3801 pf_src_connlimit(state)) {
3802 REASON_SET(reason, PFRES_SRCLIMIT);
3805 (*state)->src.state = PF_TCPS_PROXY_DST;
3807 if ((*state)->src.state == PF_TCPS_PROXY_DST) {
3808 struct pf_state_host *src, *dst;
3810 if (direction == PF_OUT) {
3811 src = &(*state)->state_key->gwy;
3812 dst = &(*state)->state_key->ext;
3814 src = &(*state)->state_key->ext;
3815 dst = &(*state)->state_key->lan;
3817 if (direction == (*state)->state_key->direction) {
3818 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
3819 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
3820 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
3821 REASON_SET(reason, PFRES_SYNPROXY);
3824 (*state)->src.max_win = MAX(ntohs(th->th_win), 1);
3825 if ((*state)->dst.seqhi == 1)
3826 (*state)->dst.seqhi = htonl(karc4random());
3827 pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr,
3828 &dst->addr, src->port, dst->port,
3829 (*state)->dst.seqhi, 0, TH_SYN, 0,
3830 (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL);
3831 REASON_SET(reason, PFRES_SYNPROXY);
3832 return (PF_SYNPROXY_DROP);
3833 } else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
3835 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) {
3836 REASON_SET(reason, PFRES_SYNPROXY);
3839 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
3840 (*state)->dst.seqlo = ntohl(th->th_seq);
3841 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
3842 pd->src, th->th_dport, th->th_sport,
3843 ntohl(th->th_ack), ntohl(th->th_seq) + 1,
3844 TH_ACK, (*state)->src.max_win, 0, 0, 0,
3845 (*state)->tag, NULL, NULL);
3846 pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr,
3847 &dst->addr, src->port, dst->port,
3848 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
3849 TH_ACK, (*state)->dst.max_win, 0, 0, 1,
3851 (*state)->src.seqdiff = (*state)->dst.seqhi -
3852 (*state)->src.seqlo;
3853 (*state)->dst.seqdiff = (*state)->src.seqhi -
3854 (*state)->dst.seqlo;
3855 (*state)->src.seqhi = (*state)->src.seqlo +
3856 (*state)->dst.max_win;
3857 (*state)->dst.seqhi = (*state)->dst.seqlo +
3858 (*state)->src.max_win;
3859 (*state)->src.wscale = (*state)->dst.wscale = 0;
3860 (*state)->src.state = (*state)->dst.state =
3862 REASON_SET(reason, PFRES_SYNPROXY);
3863 return (PF_SYNPROXY_DROP);
3867 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
3868 sws = src->wscale & PF_WSCALE_MASK;
3869 dws = dst->wscale & PF_WSCALE_MASK;
3874 * Sequence tracking algorithm from Guido van Rooij's paper:
3875 * http://www.madison-gurkha.com/publications/tcp_filtering/
3879 orig_seq = seq = ntohl(th->th_seq);
3880 if (src->seqlo == 0) {
3881 /* First packet from this end. Set its state */
3883 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
3884 src->scrub == NULL) {
3885 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
3886 REASON_SET(reason, PFRES_MEMORY);
3891 /* Deferred generation of sequence number modulator */
3892 if (dst->seqdiff && !src->seqdiff) {
3894 while ((src->seqdiff = pf_new_isn((struct pf_state_key *)&key) - seq) == 0)
3896 ack = ntohl(th->th_ack) - dst->seqdiff;
3897 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3899 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3902 ack = ntohl(th->th_ack);
3905 end = seq + pd->p_len;
3906 if (th->th_flags & TH_SYN) {
3908 (*state)->sync_flags |= PFSTATE_GOT_SYN2;
3909 if (dst->wscale & PF_WSCALE_FLAG) {
3910 src->wscale = pf_get_wscale(m, off, th->th_off,
3912 if (src->wscale & PF_WSCALE_FLAG) {
3913 /* Remove scale factor from initial
3915 sws = src->wscale & PF_WSCALE_MASK;
3916 win = ((u_int32_t)win + (1 << sws) - 1)
3918 dws = dst->wscale & PF_WSCALE_MASK;
3920 /* fixup other window */
3921 dst->max_win <<= dst->wscale &
3923 /* in case of a retrans SYN|ACK */
3928 if (th->th_flags & TH_FIN)
3932 if (src->state < TCPS_SYN_SENT)
3933 src->state = TCPS_SYN_SENT;
3936 * May need to slide the window (seqhi may have been set by
3937 * the crappy stack check or if we picked up the connection
3938 * after establishment)
3940 if (src->seqhi == 1 ||
3941 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
3942 src->seqhi = end + MAX(1, dst->max_win << dws);
3943 if (win > src->max_win)
3947 ack = ntohl(th->th_ack) - dst->seqdiff;
3949 /* Modulate sequence numbers */
3950 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3952 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3955 end = seq + pd->p_len;
3956 if (th->th_flags & TH_SYN)
3958 if (th->th_flags & TH_FIN)
3962 if ((th->th_flags & TH_ACK) == 0) {
3963 /* Let it pass through the ack skew check */
3965 } else if ((ack == 0 &&
3966 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
3967 /* broken tcp stacks do not set ack */
3968 (dst->state < TCPS_SYN_SENT)) {
3970 * Many stacks (ours included) will set the ACK number in an
3971 * FIN|ACK if the SYN times out -- no sequence to ACK.
3977 /* Ease sequencing restrictions on no data packets */
3982 ackskew = dst->seqlo - ack;
3986 * Need to demodulate the sequence numbers in any TCP SACK options
3987 * (Selective ACK). We could optionally validate the SACK values
3988 * against the current ACK window, either forwards or backwards, but
3989 * I'm not confident that SACK has been implemented properly
3990 * everywhere. It wouldn't surprise me if several stacks accidently
3991 * SACK too far backwards of previously ACKed data. There really aren't
3992 * any security implications of bad SACKing unless the target stack
3993 * doesn't validate the option length correctly. Someone trying to
3994 * spoof into a TCP connection won't bother blindly sending SACK
3997 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) {
3998 if (pf_modulate_sack(m, off, pd, th, dst))
4003 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */
4004 if (SEQ_GEQ(src->seqhi, end) &&
4005 /* Last octet inside other's window space */
4006 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
4007 /* Retrans: not more than one window back */
4008 (ackskew >= -MAXACKWINDOW) &&
4009 /* Acking not more than one reassembled fragment backwards */
4010 (ackskew <= (MAXACKWINDOW << sws)) &&
4011 /* Acking not more than one window forward */
4012 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo ||
4013 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) ||
4014 (pd->flags & PFDESC_IP_REAS) == 0)) {
4015 /* Require an exact/+1 sequence match on resets when possible */
4017 if (dst->scrub || src->scrub) {
4018 if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4019 *state, src, dst, ©back))
4023 /* update max window */
4024 if (src->max_win < win)
4026 /* synchronize sequencing */
4027 if (SEQ_GT(end, src->seqlo))
4029 /* slide the window of what the other end can send */
4030 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4031 dst->seqhi = ack + MAX((win << sws), 1);
4035 if (th->th_flags & TH_SYN)
4036 if (src->state < TCPS_SYN_SENT)
4037 src->state = TCPS_SYN_SENT;
4038 if (th->th_flags & TH_FIN)
4039 if (src->state < TCPS_CLOSING)
4040 src->state = TCPS_CLOSING;
4041 if (th->th_flags & TH_ACK) {
4042 if (dst->state == TCPS_SYN_SENT) {
4043 dst->state = TCPS_ESTABLISHED;
4044 if (src->state == TCPS_ESTABLISHED &&
4045 (*state)->src_node != NULL &&
4046 pf_src_connlimit(state)) {
4047 REASON_SET(reason, PFRES_SRCLIMIT);
4050 } else if (dst->state == TCPS_CLOSING)
4051 dst->state = TCPS_FIN_WAIT_2;
4053 if (th->th_flags & TH_RST)
4054 src->state = dst->state = TCPS_TIME_WAIT;
4056 /* update expire time */
4057 (*state)->expire = time_second;
4058 if (src->state >= TCPS_FIN_WAIT_2 &&
4059 dst->state >= TCPS_FIN_WAIT_2)
4060 (*state)->timeout = PFTM_TCP_CLOSED;
4061 else if (src->state >= TCPS_CLOSING &&
4062 dst->state >= TCPS_CLOSING)
4063 (*state)->timeout = PFTM_TCP_FIN_WAIT;
4064 else if (src->state < TCPS_ESTABLISHED ||
4065 dst->state < TCPS_ESTABLISHED)
4066 (*state)->timeout = PFTM_TCP_OPENING;
4067 else if (src->state >= TCPS_CLOSING ||
4068 dst->state >= TCPS_CLOSING)
4069 (*state)->timeout = PFTM_TCP_CLOSING;
4071 (*state)->timeout = PFTM_TCP_ESTABLISHED;
4073 /* Fall through to PASS packet */
4075 } else if ((dst->state < TCPS_SYN_SENT ||
4076 dst->state >= TCPS_FIN_WAIT_2 ||
4077 src->state >= TCPS_FIN_WAIT_2) &&
4078 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
4079 /* Within a window forward of the originating packet */
4080 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
4081 /* Within a window backward of the originating packet */
4084 * This currently handles three situations:
4085 * 1) Stupid stacks will shotgun SYNs before their peer
4087 * 2) When PF catches an already established stream (the
4088 * firewall rebooted, the state table was flushed, routes
4090 * 3) Packets get funky immediately after the connection
4091 * closes (this should catch Solaris spurious ACK|FINs
4092 * that web servers like to spew after a close)
4094 * This must be a little more careful than the above code
4095 * since packet floods will also be caught here. We don't
4096 * update the TTL here to mitigate the damage of a packet
4097 * flood and so the same code can handle awkward establishment
4098 * and a loosened connection close.
4099 * In the establishment case, a correct peer response will
4100 * validate the connection, go through the normal state code
4101 * and keep updating the state TTL.
4104 if (pf_status.debug >= PF_DEBUG_MISC) {
4105 kprintf("pf: loose state match: ");
4106 pf_print_state(*state);
4107 pf_print_flags(th->th_flags);
4108 kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4109 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, pd->p_len,
4110 ackskew, (unsigned long long)(*state)->packets[0],
4111 (unsigned long long)(*state)->packets[1],
4112 direction == PF_IN ? "in" : "out",
4113 direction == (*state)->state_key->direction ?
4117 if (dst->scrub || src->scrub) {
4118 if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4119 *state, src, dst, ©back))
4123 /* update max window */
4124 if (src->max_win < win)
4126 /* synchronize sequencing */
4127 if (SEQ_GT(end, src->seqlo))
4129 /* slide the window of what the other end can send */
4130 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4131 dst->seqhi = ack + MAX((win << sws), 1);
4134 * Cannot set dst->seqhi here since this could be a shotgunned
4135 * SYN and not an already established connection.
4138 if (th->th_flags & TH_FIN)
4139 if (src->state < TCPS_CLOSING)
4140 src->state = TCPS_CLOSING;
4141 if (th->th_flags & TH_RST)
4142 src->state = dst->state = TCPS_TIME_WAIT;
4144 /* Fall through to PASS packet */
4146 } else if ((*state)->pickup_mode == PF_PICKUPS_HASHONLY ||
4147 ((*state)->pickup_mode == PF_PICKUPS_ENABLED &&
4148 ((*state)->sync_flags & PFSTATE_GOT_SYN_MASK) !=
4149 PFSTATE_GOT_SYN_MASK)) {
4151 * If pickup mode is hash only, do not fail on sequence checks.
4153 * If pickup mode is enabled and we did not see the SYN in
4154 * both direction, do not fail on sequence checks because
4155 * we do not have complete information on window scale.
4157 * Adjust expiration and fall through to PASS packet.
4158 * XXX Add a FIN check to reduce timeout?
4160 (*state)->expire = time_second;
4163 * Failure processing
4165 if ((*state)->dst.state == TCPS_SYN_SENT &&
4166 (*state)->src.state == TCPS_SYN_SENT) {
4167 /* Send RST for state mismatches during handshake */
4168 if (!(th->th_flags & TH_RST))
4169 pf_send_tcp((*state)->rule.ptr, pd->af,
4170 pd->dst, pd->src, th->th_dport,
4171 th->th_sport, ntohl(th->th_ack), 0,
4173 (*state)->rule.ptr->return_ttl, 1, 0,
4174 pd->eh, kif->pfik_ifp);
4178 } else if (pf_status.debug >= PF_DEBUG_MISC) {
4179 kprintf("pf: BAD state: ");
4180 pf_print_state(*state);
4181 pf_print_flags(th->th_flags);
4182 kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4183 "pkts=%llu:%llu dir=%s,%s\n",
4184 seq, orig_seq, ack, pd->p_len, ackskew,
4185 (unsigned long long)(*state)->packets[0],
4186 (unsigned long long)(*state)->packets[1],
4187 direction == PF_IN ? "in" : "out",
4188 direction == (*state)->state_key->direction ?
4190 kprintf("pf: State failure on: %c %c %c %c | %c %c\n",
4191 SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
4192 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
4194 (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
4195 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
4196 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
4197 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
4199 REASON_SET(reason, PFRES_BADSTATE);
4203 /* Any packets which have gotten here are to be passed */
4205 /* translate source/destination address, if necessary */
4206 if (STATE_TRANSLATE((*state)->state_key)) {
4207 if (direction == PF_OUT) {
4208 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum,
4209 &th->th_sum, &(*state)->state_key->gwy.addr,
4210 (*state)->state_key->gwy.port, 0, pd->af);
4213 * If we don't redispatch the packet will go into
4214 * the protocol stack on the wrong cpu for the
4215 * post-translated address.
4217 /* m->m_pkthdr.fw_flags |= FW_MBUF_REDISPATCH; */
4218 m->m_flags &= ~M_HASH;
4219 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum,
4220 &th->th_sum, &(*state)->state_key->lan.addr,
4221 (*state)->state_key->lan.port, 0, pd->af);
4223 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4224 } else if (copyback) {
4225 /* Copyback sequence modulation or stateful scrub changes */
4226 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4233 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
4234 struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4236 struct pf_state_peer *src, *dst;
4237 struct pf_state_key_cmp key;
4238 struct udphdr *uh = pd->hdr.udp;
4241 key.proto = IPPROTO_UDP;
4242 if (direction == PF_IN) {
4243 PF_ACPY(&key.ext.addr, pd->src, key.af);
4244 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
4245 key.ext.port = uh->uh_sport;
4246 key.gwy.port = uh->uh_dport;
4248 PF_ACPY(&key.lan.addr, pd->src, key.af);
4249 PF_ACPY(&key.ext.addr, pd->dst, key.af);
4250 key.lan.port = uh->uh_sport;
4251 key.ext.port = uh->uh_dport;
4256 if (direction == (*state)->state_key->direction) {
4257 src = &(*state)->src;
4258 dst = &(*state)->dst;
4260 src = &(*state)->dst;
4261 dst = &(*state)->src;
4265 if (src->state < PFUDPS_SINGLE)
4266 src->state = PFUDPS_SINGLE;
4267 if (dst->state == PFUDPS_SINGLE)
4268 dst->state = PFUDPS_MULTIPLE;
4270 /* update expire time */
4271 (*state)->expire = time_second;
4272 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
4273 (*state)->timeout = PFTM_UDP_MULTIPLE;
4275 (*state)->timeout = PFTM_UDP_SINGLE;
4277 /* translate source/destination address, if necessary */
4278 if (STATE_TRANSLATE((*state)->state_key)) {
4279 if (direction == PF_OUT) {
4280 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum,
4281 &uh->uh_sum, &(*state)->state_key->gwy.addr,
4282 (*state)->state_key->gwy.port, 1, pd->af);
4285 * If we don't redispatch the packet will go into
4286 * the protocol stack on the wrong cpu for the
4287 * post-translated address.
4289 /* m->m_pkthdr.fw_flags |= FW_MBUF_REDISPATCH; */
4290 m->m_flags &= ~M_HASH;
4291 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum,
4292 &uh->uh_sum, &(*state)->state_key->lan.addr,
4293 (*state)->state_key->lan.port, 1, pd->af);
4295 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
4302 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
4303 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason)
4305 struct pf_addr *saddr = pd->src, *daddr = pd->dst;
4306 u_int16_t icmpid = 0, *icmpsum;
4309 struct pf_state_key_cmp key;
4311 switch (pd->proto) {
4314 icmptype = pd->hdr.icmp->icmp_type;
4315 icmpid = pd->hdr.icmp->icmp_id;
4316 icmpsum = &pd->hdr.icmp->icmp_cksum;
4318 if (icmptype == ICMP_UNREACH ||
4319 icmptype == ICMP_SOURCEQUENCH ||
4320 icmptype == ICMP_REDIRECT ||
4321 icmptype == ICMP_TIMXCEED ||
4322 icmptype == ICMP_PARAMPROB)
4327 case IPPROTO_ICMPV6:
4328 icmptype = pd->hdr.icmp6->icmp6_type;
4329 icmpid = pd->hdr.icmp6->icmp6_id;
4330 icmpsum = &pd->hdr.icmp6->icmp6_cksum;
4332 if (icmptype == ICMP6_DST_UNREACH ||
4333 icmptype == ICMP6_PACKET_TOO_BIG ||
4334 icmptype == ICMP6_TIME_EXCEEDED ||
4335 icmptype == ICMP6_PARAM_PROB)
4344 * ICMP query/reply message not related to a TCP/UDP packet.
4345 * Search for an ICMP state.
4348 key.proto = pd->proto;
4349 if (direction == PF_IN) {
4350 PF_ACPY(&key.ext.addr, pd->src, key.af);
4351 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
4353 key.gwy.port = icmpid;
4355 PF_ACPY(&key.lan.addr, pd->src, key.af);
4356 PF_ACPY(&key.ext.addr, pd->dst, key.af);
4357 key.lan.port = icmpid;
4363 (*state)->expire = time_second;
4364 (*state)->timeout = PFTM_ICMP_ERROR_REPLY;
4366 /* translate source/destination address, if necessary */
4367 if (STATE_TRANSLATE((*state)->state_key)) {
4368 if (direction == PF_OUT) {
4372 pf_change_a(&saddr->v4.s_addr,
4374 (*state)->state_key->gwy.addr.v4.s_addr, 0);
4375 pd->hdr.icmp->icmp_cksum =
4377 pd->hdr.icmp->icmp_cksum, icmpid,
4378 (*state)->state_key->gwy.port, 0);
4379 pd->hdr.icmp->icmp_id =
4380 (*state)->state_key->gwy.port;
4381 m_copyback(m, off, ICMP_MINLEN,
4382 (caddr_t)pd->hdr.icmp);
4388 &pd->hdr.icmp6->icmp6_cksum,
4389 &(*state)->state_key->gwy.addr, 0);
4391 sizeof(struct icmp6_hdr),
4392 (caddr_t)pd->hdr.icmp6);
4400 pf_change_a(&daddr->v4.s_addr,
4402 (*state)->state_key->lan.addr.v4.s_addr, 0);
4403 pd->hdr.icmp->icmp_cksum =
4405 pd->hdr.icmp->icmp_cksum, icmpid,
4406 (*state)->state_key->lan.port, 0);
4407 pd->hdr.icmp->icmp_id =
4408 (*state)->state_key->lan.port;
4409 m_copyback(m, off, ICMP_MINLEN,
4410 (caddr_t)pd->hdr.icmp);
4416 &pd->hdr.icmp6->icmp6_cksum,
4417 &(*state)->state_key->lan.addr, 0);
4419 sizeof(struct icmp6_hdr),
4420 (caddr_t)pd->hdr.icmp6);
4431 * ICMP error message in response to a TCP/UDP packet.
4432 * Extract the inner TCP/UDP header and search for that state.
4435 struct pf_pdesc pd2;
4440 struct ip6_hdr h2_6;
4450 /* offset of h2 in mbuf chain */
4451 ipoff2 = off + ICMP_MINLEN;
4453 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
4454 NULL, reason, pd2.af)) {
4455 DPFPRINTF(PF_DEBUG_MISC,
4456 ("pf: ICMP error message too short "
4461 * ICMP error messages don't refer to non-first
4464 if (h2.ip_off & htons(IP_OFFMASK)) {
4465 REASON_SET(reason, PFRES_FRAG);
4469 /* offset of protocol header that follows h2 */
4470 off2 = ipoff2 + (h2.ip_hl << 2);
4472 pd2.proto = h2.ip_p;
4473 pd2.src = (struct pf_addr *)&h2.ip_src;
4474 pd2.dst = (struct pf_addr *)&h2.ip_dst;
4475 pd2.ip_sum = &h2.ip_sum;
4480 ipoff2 = off + sizeof(struct icmp6_hdr);
4482 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
4483 NULL, reason, pd2.af)) {
4484 DPFPRINTF(PF_DEBUG_MISC,
4485 ("pf: ICMP error message too short "
4489 pd2.proto = h2_6.ip6_nxt;
4490 pd2.src = (struct pf_addr *)&h2_6.ip6_src;
4491 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
4493 off2 = ipoff2 + sizeof(h2_6);
4495 switch (pd2.proto) {
4496 case IPPROTO_FRAGMENT:
4498 * ICMPv6 error messages for
4499 * non-first fragments
4501 REASON_SET(reason, PFRES_FRAG);
4504 case IPPROTO_HOPOPTS:
4505 case IPPROTO_ROUTING:
4506 case IPPROTO_DSTOPTS: {
4507 /* get next header and header length */
4508 struct ip6_ext opt6;
4510 if (!pf_pull_hdr(m, off2, &opt6,
4511 sizeof(opt6), NULL, reason,
4513 DPFPRINTF(PF_DEBUG_MISC,
4514 ("pf: ICMPv6 short opt\n"));
4517 if (pd2.proto == IPPROTO_AH)
4518 off2 += (opt6.ip6e_len + 2) * 4;
4520 off2 += (opt6.ip6e_len + 1) * 8;
4521 pd2.proto = opt6.ip6e_nxt;
4522 /* goto the next header */
4529 } while (!terminal);
4533 DPFPRINTF(PF_DEBUG_MISC,
4534 ("pf: ICMP AF %d unknown (ip6)\n", pd->af));
4539 switch (pd2.proto) {
4543 struct pf_state_peer *src, *dst;
4548 * Only the first 8 bytes of the TCP header can be
4549 * expected. Don't access any TCP header fields after
4550 * th_seq, an ackskew test is not possible.
4552 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason,
4554 DPFPRINTF(PF_DEBUG_MISC,
4555 ("pf: ICMP error message too short "
4561 key.proto = IPPROTO_TCP;
4562 if (direction == PF_IN) {
4563 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4564 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4565 key.ext.port = th.th_dport;
4566 key.gwy.port = th.th_sport;
4568 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4569 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4570 key.lan.port = th.th_dport;
4571 key.ext.port = th.th_sport;
4576 if (direction == (*state)->state_key->direction) {
4577 src = &(*state)->dst;
4578 dst = &(*state)->src;
4580 src = &(*state)->src;
4581 dst = &(*state)->dst;
4584 if (src->wscale && dst->wscale)
4585 dws = dst->wscale & PF_WSCALE_MASK;
4589 /* Demodulate sequence number */
4590 seq = ntohl(th.th_seq) - src->seqdiff;
4592 pf_change_a(&th.th_seq, icmpsum,
4597 if (!SEQ_GEQ(src->seqhi, seq) ||
4598 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) {
4599 if (pf_status.debug >= PF_DEBUG_MISC) {
4600 kprintf("pf: BAD ICMP %d:%d ",
4601 icmptype, pd->hdr.icmp->icmp_code);
4602 pf_print_host(pd->src, 0, pd->af);
4604 pf_print_host(pd->dst, 0, pd->af);
4605 kprintf(" state: ");
4606 pf_print_state(*state);
4607 kprintf(" seq=%u\n", seq);
4609 REASON_SET(reason, PFRES_BADSTATE);
4613 if (STATE_TRANSLATE((*state)->state_key)) {
4614 if (direction == PF_IN) {
4615 pf_change_icmp(pd2.src, &th.th_sport,
4616 daddr, &(*state)->state_key->lan.addr,
4617 (*state)->state_key->lan.port, NULL,
4618 pd2.ip_sum, icmpsum,
4619 pd->ip_sum, 0, pd2.af);
4621 pf_change_icmp(pd2.dst, &th.th_dport,
4622 saddr, &(*state)->state_key->gwy.addr,
4623 (*state)->state_key->gwy.port, NULL,
4624 pd2.ip_sum, icmpsum,
4625 pd->ip_sum, 0, pd2.af);
4634 m_copyback(m, off, ICMP_MINLEN,
4635 (caddr_t)pd->hdr.icmp);
4636 m_copyback(m, ipoff2, sizeof(h2),
4643 sizeof(struct icmp6_hdr),
4644 (caddr_t)pd->hdr.icmp6);
4645 m_copyback(m, ipoff2, sizeof(h2_6),
4650 m_copyback(m, off2, 8, (caddr_t)&th);
4659 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
4660 NULL, reason, pd2.af)) {
4661 DPFPRINTF(PF_DEBUG_MISC,
4662 ("pf: ICMP error message too short "
4668 key.proto = IPPROTO_UDP;
4669 if (direction == PF_IN) {
4670 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4671 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4672 key.ext.port = uh.uh_dport;
4673 key.gwy.port = uh.uh_sport;
4675 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4676 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4677 key.lan.port = uh.uh_dport;
4678 key.ext.port = uh.uh_sport;
4683 if (STATE_TRANSLATE((*state)->state_key)) {
4684 if (direction == PF_IN) {
4685 pf_change_icmp(pd2.src, &uh.uh_sport,
4687 &(*state)->state_key->lan.addr,
4688 (*state)->state_key->lan.port,
4690 pd2.ip_sum, icmpsum,
4691 pd->ip_sum, 1, pd2.af);
4693 pf_change_icmp(pd2.dst, &uh.uh_dport,
4695 &(*state)->state_key->gwy.addr,
4696 (*state)->state_key->gwy.port, &uh.uh_sum,
4697 pd2.ip_sum, icmpsum,
4698 pd->ip_sum, 1, pd2.af);
4703 m_copyback(m, off, ICMP_MINLEN,
4704 (caddr_t)pd->hdr.icmp);
4705 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4711 sizeof(struct icmp6_hdr),
4712 (caddr_t)pd->hdr.icmp6);
4713 m_copyback(m, ipoff2, sizeof(h2_6),
4718 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh);
4725 case IPPROTO_ICMP: {
4728 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
4729 NULL, reason, pd2.af)) {
4730 DPFPRINTF(PF_DEBUG_MISC,
4731 ("pf: ICMP error message too short i"
4737 key.proto = IPPROTO_ICMP;
4738 if (direction == PF_IN) {
4739 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4740 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4742 key.gwy.port = iih.icmp_id;
4744 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4745 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4746 key.lan.port = iih.icmp_id;
4752 if (STATE_TRANSLATE((*state)->state_key)) {
4753 if (direction == PF_IN) {
4754 pf_change_icmp(pd2.src, &iih.icmp_id,
4756 &(*state)->state_key->lan.addr,
4757 (*state)->state_key->lan.port, NULL,
4758 pd2.ip_sum, icmpsum,
4759 pd->ip_sum, 0, AF_INET);
4761 pf_change_icmp(pd2.dst, &iih.icmp_id,
4763 &(*state)->state_key->gwy.addr,
4764 (*state)->state_key->gwy.port, NULL,
4765 pd2.ip_sum, icmpsum,
4766 pd->ip_sum, 0, AF_INET);
4768 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
4769 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4770 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih);
4778 case IPPROTO_ICMPV6: {
4779 struct icmp6_hdr iih;
4781 if (!pf_pull_hdr(m, off2, &iih,
4782 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) {
4783 DPFPRINTF(PF_DEBUG_MISC,
4784 ("pf: ICMP error message too short "
4790 key.proto = IPPROTO_ICMPV6;
4791 if (direction == PF_IN) {
4792 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4793 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4795 key.gwy.port = iih.icmp6_id;
4797 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4798 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4799 key.lan.port = iih.icmp6_id;
4805 if (STATE_TRANSLATE((*state)->state_key)) {
4806 if (direction == PF_IN) {
4807 pf_change_icmp(pd2.src, &iih.icmp6_id,
4809 &(*state)->state_key->lan.addr,
4810 (*state)->state_key->lan.port, NULL,
4811 pd2.ip_sum, icmpsum,
4812 pd->ip_sum, 0, AF_INET6);
4814 pf_change_icmp(pd2.dst, &iih.icmp6_id,
4815 saddr, &(*state)->state_key->gwy.addr,
4816 (*state)->state_key->gwy.port, NULL,
4817 pd2.ip_sum, icmpsum,
4818 pd->ip_sum, 0, AF_INET6);
4820 m_copyback(m, off, sizeof(struct icmp6_hdr),
4821 (caddr_t)pd->hdr.icmp6);
4822 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6);
4823 m_copyback(m, off2, sizeof(struct icmp6_hdr),
4833 key.proto = pd2.proto;
4834 if (direction == PF_IN) {
4835 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4836 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4840 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4841 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4848 if (STATE_TRANSLATE((*state)->state_key)) {
4849 if (direction == PF_IN) {
4850 pf_change_icmp(pd2.src, NULL,
4852 &(*state)->state_key->lan.addr,
4854 pd2.ip_sum, icmpsum,
4855 pd->ip_sum, 0, pd2.af);
4857 pf_change_icmp(pd2.dst, NULL,
4859 &(*state)->state_key->gwy.addr,
4861 pd2.ip_sum, icmpsum,
4862 pd->ip_sum, 0, pd2.af);
4867 m_copyback(m, off, ICMP_MINLEN,
4868 (caddr_t)pd->hdr.icmp);
4869 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4875 sizeof(struct icmp6_hdr),
4876 (caddr_t)pd->hdr.icmp6);
4877 m_copyback(m, ipoff2, sizeof(h2_6),
4892 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
4893 struct pf_pdesc *pd)
4895 struct pf_state_peer *src, *dst;
4896 struct pf_state_key_cmp key;
4899 key.proto = pd->proto;
4900 if (direction == PF_IN) {
4901 PF_ACPY(&key.ext.addr, pd->src, key.af);
4902 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
4906 PF_ACPY(&key.lan.addr, pd->src, key.af);
4907 PF_ACPY(&key.ext.addr, pd->dst, key.af);
4914 if (direction == (*state)->state_key->direction) {
4915 src = &(*state)->src;
4916 dst = &(*state)->dst;
4918 src = &(*state)->dst;
4919 dst = &(*state)->src;
4923 if (src->state < PFOTHERS_SINGLE)
4924 src->state = PFOTHERS_SINGLE;
4925 if (dst->state == PFOTHERS_SINGLE)
4926 dst->state = PFOTHERS_MULTIPLE;
4928 /* update expire time */
4929 (*state)->expire = time_second;
4930 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
4931 (*state)->timeout = PFTM_OTHER_MULTIPLE;
4933 (*state)->timeout = PFTM_OTHER_SINGLE;
4935 /* translate source/destination address, if necessary */
4936 if (STATE_TRANSLATE((*state)->state_key)) {
4937 if (direction == PF_OUT)
4941 pf_change_a(&pd->src->v4.s_addr,
4943 (*state)->state_key->gwy.addr.v4.s_addr,
4950 &(*state)->state_key->gwy.addr, pd->af);
4958 pf_change_a(&pd->dst->v4.s_addr,
4960 (*state)->state_key->lan.addr.v4.s_addr,
4967 &(*state)->state_key->lan.addr, pd->af);
4977 * ipoff and off are measured from the start of the mbuf chain.
4978 * h must be at "ipoff" on the mbuf chain.
4981 pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
4982 u_short *actionp, u_short *reasonp, sa_family_t af)
4987 struct ip *h = mtod(m, struct ip *);
4988 u_int16_t fragoff = (h->ip_off & IP_OFFMASK) << 3;
4992 ACTION_SET(actionp, PF_PASS);
4994 ACTION_SET(actionp, PF_DROP);
4995 REASON_SET(reasonp, PFRES_FRAG);
4999 if (m->m_pkthdr.len < off + len ||
5000 h->ip_len < off + len) {
5001 ACTION_SET(actionp, PF_DROP);
5002 REASON_SET(reasonp, PFRES_SHORT);
5010 struct ip6_hdr *h = mtod(m, struct ip6_hdr *);
5012 if (m->m_pkthdr.len < off + len ||
5013 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
5014 (unsigned)(off + len)) {
5015 ACTION_SET(actionp, PF_DROP);
5016 REASON_SET(reasonp, PFRES_SHORT);
5023 m_copydata(m, off, len, p);
5028 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif)
5030 struct sockaddr_in *dst;
5034 struct sockaddr_in6 *dst6;
5035 struct route_in6 ro;
5039 struct radix_node *rn;
5044 bzero(&ro, sizeof(ro));
5047 dst = satosin(&ro.ro_dst);
5048 dst->sin_family = AF_INET;
5049 dst->sin_len = sizeof(*dst);
5050 dst->sin_addr = addr->v4;
5054 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
5055 dst6->sin6_family = AF_INET6;
5056 dst6->sin6_len = sizeof(*dst6);
5057 dst6->sin6_addr = addr->v6;
5064 /* Skip checks for ipsec interfaces */
5065 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
5068 rtalloc_ign((struct route *)&ro, 0);
5070 if (ro.ro_rt != NULL) {
5071 /* No interface given, this is a no-route check */
5075 if (kif->pfik_ifp == NULL) {
5080 /* Perform uRPF check if passed input interface */
5082 rn = (struct radix_node *)ro.ro_rt;
5084 rt = (struct rtentry *)rn;
5087 if (kif->pfik_ifp == ifp)
5090 } while (check_mpath == 1 && rn != NULL && ret == 0);
5094 if (ro.ro_rt != NULL)
5100 pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw)
5102 struct sockaddr_in *dst;
5104 struct sockaddr_in6 *dst6;
5105 struct route_in6 ro;
5111 ASSERT_LWKT_TOKEN_HELD(&pf_token);
5113 bzero(&ro, sizeof(ro));
5116 dst = satosin(&ro.ro_dst);
5117 dst->sin_family = AF_INET;
5118 dst->sin_len = sizeof(*dst);
5119 dst->sin_addr = addr->v4;
5123 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
5124 dst6->sin6_family = AF_INET6;
5125 dst6->sin6_len = sizeof(*dst6);
5126 dst6->sin6_addr = addr->v6;
5133 rtalloc_ign((struct route *)&ro, (RTF_CLONING | RTF_PRCLONING));
5135 if (ro.ro_rt != NULL) {
5144 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5145 struct pf_state *s, struct pf_pdesc *pd)
5147 struct mbuf *m0, *m1;
5148 struct route iproute;
5149 struct route *ro = NULL;
5150 struct sockaddr_in *dst;
5152 struct ifnet *ifp = NULL;
5153 struct pf_addr naddr;
5154 struct pf_src_node *sn = NULL;
5161 ASSERT_LWKT_TOKEN_HELD(&pf_token);
5163 if (m == NULL || *m == NULL || r == NULL ||
5164 (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
5165 panic("pf_route: invalid parameters");
5167 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
5168 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
5169 (*m)->m_pkthdr.pf.routed = 1;
5171 if ((*m)->m_pkthdr.pf.routed++ > 3) {
5178 if (r->rt == PF_DUPTO) {
5179 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL) {
5183 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) {
5189 if (m0->m_len < sizeof(struct ip)) {
5190 DPFPRINTF(PF_DEBUG_URGENT,
5191 ("pf_route: m0->m_len < sizeof(struct ip)\n"));
5195 ip = mtod(m0, struct ip *);
5198 bzero((caddr_t)ro, sizeof(*ro));
5199 dst = satosin(&ro->ro_dst);
5200 dst->sin_family = AF_INET;
5201 dst->sin_len = sizeof(*dst);
5202 dst->sin_addr = ip->ip_dst;
5204 if (r->rt == PF_FASTROUTE) {
5206 if (ro->ro_rt == 0) {
5207 ipstat.ips_noroute++;
5211 ifp = ro->ro_rt->rt_ifp;
5212 ro->ro_rt->rt_use++;
5214 if (ro->ro_rt->rt_flags & RTF_GATEWAY)
5215 dst = satosin(ro->ro_rt->rt_gateway);
5217 if (TAILQ_EMPTY(&r->rpool.list)) {
5218 DPFPRINTF(PF_DEBUG_URGENT,
5219 ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n"));
5223 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
5225 if (!PF_AZERO(&naddr, AF_INET))
5226 dst->sin_addr.s_addr = naddr.v4.s_addr;
5227 ifp = r->rpool.cur->kif ?
5228 r->rpool.cur->kif->pfik_ifp : NULL;
5230 if (!PF_AZERO(&s->rt_addr, AF_INET))
5231 dst->sin_addr.s_addr =
5232 s->rt_addr.v4.s_addr;
5233 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5240 if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) {
5242 } else if (m0 == NULL) {
5245 if (m0->m_len < sizeof(struct ip)) {
5246 DPFPRINTF(PF_DEBUG_URGENT,
5247 ("pf_route: m0->m_len < sizeof(struct ip)\n"));
5250 ip = mtod(m0, struct ip *);
5253 /* Copied from FreeBSD 5.1-CURRENT ip_output. */
5254 m0->m_pkthdr.csum_flags |= CSUM_IP;
5255 sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist;
5256 if (sw_csum & CSUM_DELAY_DATA) {
5257 in_delayed_cksum(m0);
5258 sw_csum &= ~CSUM_DELAY_DATA;
5260 m0->m_pkthdr.csum_flags &= ifp->if_hwassist;
5262 if (ip->ip_len <= ifp->if_mtu ||
5263 (ifp->if_hwassist & CSUM_FRAGMENT &&
5264 (ip->ip_off & IP_DF) == 0)) {
5265 ip->ip_len = htons(ip->ip_len);
5266 ip->ip_off = htons(ip->ip_off);
5268 if (sw_csum & CSUM_DELAY_IP) {
5270 if (ip->ip_v == IPVERSION &&
5271 (ip->ip_hl << 2) == sizeof(*ip)) {
5272 ip->ip_sum = in_cksum_hdr(ip);
5274 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
5277 lwkt_reltoken(&pf_token);
5278 error = ifp->if_output(ifp, m0, sintosa(dst), ro->ro_rt);
5279 lwkt_gettoken(&pf_token);
5284 * Too large for interface; fragment if possible.
5285 * Must be able to put at least 8 bytes per fragment.
5287 if (ip->ip_off & IP_DF) {
5288 ipstat.ips_cantfrag++;
5289 if (r->rt != PF_DUPTO) {
5290 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
5298 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum);
5303 for (m0 = m1; m0; m0 = m1) {
5307 lwkt_reltoken(&pf_token);
5308 error = (*ifp->if_output)(ifp, m0, sintosa(dst),
5310 lwkt_gettoken(&pf_token);
5316 ipstat.ips_fragmented++;
5319 if (r->rt != PF_DUPTO)
5321 if (ro == &iproute && ro->ro_rt)
5333 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5334 struct pf_state *s, struct pf_pdesc *pd)
5337 struct route_in6 ip6route;
5338 struct route_in6 *ro;
5339 struct sockaddr_in6 *dst;
5340 struct ip6_hdr *ip6;
5341 struct ifnet *ifp = NULL;
5342 struct pf_addr naddr;
5343 struct pf_src_node *sn = NULL;
5346 if (m == NULL || *m == NULL || r == NULL ||
5347 (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
5348 panic("pf_route6: invalid parameters");
5350 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
5351 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
5352 (*m)->m_pkthdr.pf.routed = 1;
5354 if ((*m)->m_pkthdr.pf.routed++ > 3) {
5361 if (r->rt == PF_DUPTO) {
5362 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL)
5365 if ((r->rt == PF_REPLYTO) == (r->direction == dir))
5370 if (m0->m_len < sizeof(struct ip6_hdr)) {
5371 DPFPRINTF(PF_DEBUG_URGENT,
5372 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n"));
5375 ip6 = mtod(m0, struct ip6_hdr *);
5378 bzero((caddr_t)ro, sizeof(*ro));
5379 dst = (struct sockaddr_in6 *)&ro->ro_dst;
5380 dst->sin6_family = AF_INET6;
5381 dst->sin6_len = sizeof(*dst);
5382 dst->sin6_addr = ip6->ip6_dst;
5384 /* Cheat. XXX why only in the v6 case??? */
5385 if (r->rt == PF_FASTROUTE) {
5386 m0->m_pkthdr.pf.flags |= PF_TAG_GENERATED;
5387 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL);
5391 if (TAILQ_EMPTY(&r->rpool.list)) {
5392 DPFPRINTF(PF_DEBUG_URGENT,
5393 ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n"));
5397 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
5399 if (!PF_AZERO(&naddr, AF_INET6))
5400 PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5402 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
5404 if (!PF_AZERO(&s->rt_addr, AF_INET6))
5405 PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5406 &s->rt_addr, AF_INET6);
5407 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5413 if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) {
5415 } else if (m0 == NULL) {
5418 if (m0->m_len < sizeof(struct ip6_hdr)) {
5419 DPFPRINTF(PF_DEBUG_URGENT,
5420 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n"));
5423 ip6 = mtod(m0, struct ip6_hdr *);
5427 * If the packet is too large for the outgoing interface,
5428 * send back an icmp6 error.
5430 if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr))
5431 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
5432 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) {
5433 error = nd6_output(ifp, ifp, m0, dst, NULL);
5435 in6_ifstat_inc(ifp, ifs6_in_toobig);
5436 if (r->rt != PF_DUPTO) {
5437 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
5443 if (r->rt != PF_DUPTO)
5456 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag
5457 * off is the offset where the protocol header starts
5458 * len is the total length of protocol header plus payload
5459 * returns 0 when the checksum is valid, otherwise returns 1.
5463 * FreeBSD supports cksum offload for the following drivers.
5464 * em(4), gx(4), lge(4), nge(4), ti(4), xl(4)
5465 * If we can make full use of it we would outperform ipfw/ipfilter in
5466 * very heavy traffic.
5467 * I have not tested 'cause I don't have NICs that supports cksum offload.
5468 * (There might be problems. Typical phenomena would be
5469 * 1. No route message for UDP packet.
5470 * 2. No connection acceptance from external hosts regardless of rule set.)
5473 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p,
5480 if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
5482 if (m->m_pkthdr.len < off + len)
5488 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5489 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5490 sum = m->m_pkthdr.csum_data;
5492 ip = mtod(m, struct ip *);
5493 sum = in_pseudo(ip->ip_src.s_addr,
5494 ip->ip_dst.s_addr, htonl((u_short)len +
5495 m->m_pkthdr.csum_data + p));
5503 case IPPROTO_ICMPV6:
5513 if (p == IPPROTO_ICMP) {
5518 sum = in_cksum(m, len);
5522 if (m->m_len < sizeof(struct ip))
5524 sum = in_cksum_range(m, p, off, len);
5526 m->m_pkthdr.csum_flags |=
5529 m->m_pkthdr.csum_data = 0xffff;
5535 if (m->m_len < sizeof(struct ip6_hdr))
5537 sum = in6_cksum(m, p, off, len);
5540 * IPv6 H/W cksum off-load not supported yet!
5543 * m->m_pkthdr.csum_flags |=
5544 * (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
5545 * m->m_pkthdr.csum_data = 0xffff;
5557 tcpstat.tcps_rcvbadsum++;
5560 udpstat.udps_badsum++;
5563 icmpstat.icps_checksum++;
5566 case IPPROTO_ICMPV6:
5567 icmp6stat.icp6s_checksum++;
5578 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0,
5579 struct ether_header *eh, struct inpcb *inp)
5581 struct pfi_kif *kif;
5582 u_short action, reason = 0, log = 0;
5583 struct mbuf *m = *m0;
5584 struct ip *h = NULL;
5585 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr;
5586 struct pf_state *s = NULL;
5587 struct pf_state_key *sk = NULL;
5588 struct pf_ruleset *ruleset = NULL;
5590 int off, dirndx, pqid = 0;
5592 if (!pf_status.running)
5595 memset(&pd, 0, sizeof(pd));
5596 if (ifp->if_type == IFT_CARP && ifp->if_carpdev)
5597 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif;
5599 kif = (struct pfi_kif *)ifp->if_pf_kif;
5602 DPFPRINTF(PF_DEBUG_URGENT,
5603 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname));
5606 if (kif->pfik_flags & PFI_IFLAG_SKIP)
5610 if ((m->m_flags & M_PKTHDR) == 0)
5611 panic("non-M_PKTHDR is passed to pf_test");
5612 #endif /* DIAGNOSTIC */
5614 if (m->m_pkthdr.len < (int)sizeof(*h)) {
5616 REASON_SET(&reason, PFRES_SHORT);
5621 if (m->m_pkthdr.pf.flags & PF_TAG_GENERATED)
5624 /* We do IP header normalization and packet reassembly here */
5625 if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) {
5629 m = *m0; /* pf_normalize messes with m0 */
5630 h = mtod(m, struct ip *);
5632 off = h->ip_hl << 2;
5633 if (off < (int)sizeof(*h)) {
5635 REASON_SET(&reason, PFRES_SHORT);
5640 pd.src = (struct pf_addr *)&h->ip_src;
5641 pd.dst = (struct pf_addr *)&h->ip_dst;
5642 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET);
5643 pd.ip_sum = &h->ip_sum;
5647 pd.tot_len = h->ip_len;
5650 /* handle fragments that didn't get reassembled by normalization */
5651 if (h->ip_off & (IP_MF | IP_OFFMASK)) {
5652 action = pf_test_fragment(&r, dir, kif, m, h,
5663 if (!pf_pull_hdr(m, off, &th, sizeof(th),
5664 &action, &reason, AF_INET)) {
5665 log = action != PF_PASS;
5668 pd.p_len = pd.tot_len - off - (th.th_off << 2);
5669 if ((th.th_flags & TH_ACK) && pd.p_len == 0)
5671 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
5672 if (action == PF_DROP)
5674 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
5676 if (action == PF_PASS) {
5678 pfsync_update_state(s);
5679 #endif /* NPFSYNC */
5683 } else if (s == NULL)
5684 action = pf_test_rule(&r, &s, dir, kif,
5685 m, off, h, &pd, &a, &ruleset, NULL, inp);
5693 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
5694 &action, &reason, AF_INET)) {
5695 log = action != PF_PASS;
5698 if (uh.uh_dport == 0 ||
5699 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
5700 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
5702 REASON_SET(&reason, PFRES_SHORT);
5705 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
5706 if (action == PF_PASS) {
5708 pfsync_update_state(s);
5709 #endif /* NPFSYNC */
5713 } else if (s == NULL)
5714 action = pf_test_rule(&r, &s, dir, kif,
5715 m, off, h, &pd, &a, &ruleset, NULL, inp);
5719 case IPPROTO_ICMP: {
5723 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
5724 &action, &reason, AF_INET)) {
5725 log = action != PF_PASS;
5728 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd,
5730 if (action == PF_PASS) {
5732 pfsync_update_state(s);
5733 #endif /* NPFSYNC */
5737 } else if (s == NULL)
5738 action = pf_test_rule(&r, &s, dir, kif,
5739 m, off, h, &pd, &a, &ruleset, NULL, inp);
5744 action = pf_test_state_other(&s, dir, kif, &pd);
5745 if (action == PF_PASS) {
5747 pfsync_update_state(s);
5748 #endif /* NPFSYNC */
5752 } else if (s == NULL)
5753 action = pf_test_rule(&r, &s, dir, kif, m, off, h,
5754 &pd, &a, &ruleset, NULL, inp);
5759 if (action == PF_PASS && h->ip_hl > 5 &&
5760 !((s && s->allow_opts) || r->allow_opts)) {
5762 REASON_SET(&reason, PFRES_IPOPTIONS);
5764 DPFPRINTF(PF_DEBUG_MISC,
5765 ("pf: dropping packet with ip options\n"));
5768 if ((s && s->tag) || r->rtableid)
5769 pf_tag_packet(m, s ? s->tag : 0, r->rtableid);
5772 if (action == PF_PASS && r->qid) {
5773 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
5774 if (pqid || (pd.tos & IPTOS_LOWDELAY))
5775 m->m_pkthdr.pf.qid = r->pqid;
5777 m->m_pkthdr.pf.qid = r->qid;
5778 m->m_pkthdr.pf.ecn_af = AF_INET;
5779 m->m_pkthdr.pf.hdr = h;
5780 /* add connection hash for fairq */
5783 m->m_pkthdr.pf.state_hash = s->hash;
5784 m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED;
5790 * connections redirected to loopback should not match sockets
5791 * bound specifically to loopback due to security implications,
5792 * see tcp_input() and in_pcblookup_listen().
5794 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
5795 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
5796 (s->nat_rule.ptr->action == PF_RDR ||
5797 s->nat_rule.ptr->action == PF_BINAT) &&
5798 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET)
5799 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST;
5804 if (s != NULL && s->nat_rule.ptr != NULL &&
5805 s->nat_rule.ptr->log & PF_LOG_ALL)
5806 lr = s->nat_rule.ptr;
5809 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset,
5813 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
5814 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;
5816 if (action == PF_PASS || r->action == PF_DROP) {
5817 dirndx = (dir == PF_OUT);
5818 r->packets[dirndx]++;
5819 r->bytes[dirndx] += pd.tot_len;
5821 a->packets[dirndx]++;
5822 a->bytes[dirndx] += pd.tot_len;
5826 if (s->nat_rule.ptr != NULL) {
5827 s->nat_rule.ptr->packets[dirndx]++;
5828 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
5830 if (s->src_node != NULL) {
5831 s->src_node->packets[dirndx]++;
5832 s->src_node->bytes[dirndx] += pd.tot_len;
5834 if (s->nat_src_node != NULL) {
5835 s->nat_src_node->packets[dirndx]++;
5836 s->nat_src_node->bytes[dirndx] += pd.tot_len;
5838 dirndx = (dir == sk->direction) ? 0 : 1;
5839 s->packets[dirndx]++;
5840 s->bytes[dirndx] += pd.tot_len;
5843 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
5847 * XXX: we need to make sure that the addresses
5848 * passed to pfr_update_stats() are the same than
5849 * the addresses used during matching (pfr_match)
5851 if (r == &pf_default_rule) {
5853 x = (sk == NULL || sk->direction == dir) ?
5854 &pd.baddr : &pd.naddr;
5856 x = (sk == NULL || sk->direction == dir) ?
5857 &pd.naddr : &pd.baddr;
5858 if (x == &pd.baddr || s == NULL) {
5859 /* we need to change the address */
5866 if (tr->src.addr.type == PF_ADDR_TABLE)
5867 pfr_update_stats(tr->src.addr.p.tbl, (sk == NULL ||
5868 sk->direction == dir) ?
5869 pd.src : pd.dst, pd.af,
5870 pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5872 if (tr->dst.addr.type == PF_ADDR_TABLE)
5873 pfr_update_stats(tr->dst.addr.p.tbl, (sk == NULL ||
5874 sk->direction == dir) ? pd.dst : pd.src, pd.af,
5875 pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5880 if (action == PF_SYNPROXY_DROP) {
5885 /* pf_route can free the mbuf causing *m0 to become NULL */
5886 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd);
5894 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0,
5895 struct ether_header *eh, struct inpcb *inp)
5897 struct pfi_kif *kif;
5898 u_short action, reason = 0, log = 0;
5899 struct mbuf *m = *m0, *n = NULL;
5900 struct ip6_hdr *h = NULL;
5901 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr;
5902 struct pf_state *s = NULL;
5903 struct pf_state_key *sk = NULL;
5904 struct pf_ruleset *ruleset = NULL;
5906 int off, terminal = 0, dirndx, rh_cnt = 0;
5908 if (!pf_status.running)
5911 memset(&pd, 0, sizeof(pd));
5912 if (ifp->if_type == IFT_CARP && ifp->if_carpdev)
5913 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif;
5915 kif = (struct pfi_kif *)ifp->if_pf_kif;
5918 DPFPRINTF(PF_DEBUG_URGENT,
5919 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname));
5922 if (kif->pfik_flags & PFI_IFLAG_SKIP)
5926 if ((m->m_flags & M_PKTHDR) == 0)
5927 panic("non-M_PKTHDR is passed to pf_test6");
5928 #endif /* DIAGNOSTIC */
5930 if (m->m_pkthdr.len < (int)sizeof(*h)) {
5932 REASON_SET(&reason, PFRES_SHORT);
5937 if (m->m_pkthdr.pf.flags & PF_TAG_GENERATED)
5940 /* We do IP header normalization and packet reassembly here */
5941 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) {
5945 m = *m0; /* pf_normalize messes with m0 */
5946 h = mtod(m, struct ip6_hdr *);
5950 * we do not support jumbogram yet. if we keep going, zero ip6_plen
5951 * will do something bad, so drop the packet for now.
5953 if (htons(h->ip6_plen) == 0) {
5955 REASON_SET(&reason, PFRES_NORM); /*XXX*/
5960 pd.src = (struct pf_addr *)&h->ip6_src;
5961 pd.dst = (struct pf_addr *)&h->ip6_dst;
5962 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6);
5966 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
5969 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
5970 pd.proto = h->ip6_nxt;
5973 case IPPROTO_FRAGMENT:
5974 action = pf_test_fragment(&r, dir, kif, m, h,
5976 if (action == PF_DROP)
5977 REASON_SET(&reason, PFRES_FRAG);
5979 case IPPROTO_ROUTING: {
5980 struct ip6_rthdr rthdr;
5983 DPFPRINTF(PF_DEBUG_MISC,
5984 ("pf: IPv6 more than one rthdr\n"));
5986 REASON_SET(&reason, PFRES_IPOPTIONS);
5990 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL,
5992 DPFPRINTF(PF_DEBUG_MISC,
5993 ("pf: IPv6 short rthdr\n"));
5995 REASON_SET(&reason, PFRES_SHORT);
5999 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) {
6000 DPFPRINTF(PF_DEBUG_MISC,
6001 ("pf: IPv6 rthdr0\n"));
6003 REASON_SET(&reason, PFRES_IPOPTIONS);
6010 case IPPROTO_HOPOPTS:
6011 case IPPROTO_DSTOPTS: {
6012 /* get next header and header length */
6013 struct ip6_ext opt6;
6015 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
6016 NULL, &reason, pd.af)) {
6017 DPFPRINTF(PF_DEBUG_MISC,
6018 ("pf: IPv6 short opt\n"));
6023 if (pd.proto == IPPROTO_AH)
6024 off += (opt6.ip6e_len + 2) * 4;
6026 off += (opt6.ip6e_len + 1) * 8;
6027 pd.proto = opt6.ip6e_nxt;
6028 /* goto the next header */
6035 } while (!terminal);
6037 /* if there's no routing header, use unmodified mbuf for checksumming */
6047 if (!pf_pull_hdr(m, off, &th, sizeof(th),
6048 &action, &reason, AF_INET6)) {
6049 log = action != PF_PASS;
6052 pd.p_len = pd.tot_len - off - (th.th_off << 2);
6053 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
6054 if (action == PF_DROP)
6056 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
6058 if (action == PF_PASS) {
6060 pfsync_update_state(s);
6061 #endif /* NPFSYNC */
6065 } else if (s == NULL)
6066 action = pf_test_rule(&r, &s, dir, kif,
6067 m, off, h, &pd, &a, &ruleset, NULL, inp);
6075 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
6076 &action, &reason, AF_INET6)) {
6077 log = action != PF_PASS;
6080 if (uh.uh_dport == 0 ||
6081 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
6082 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
6084 REASON_SET(&reason, PFRES_SHORT);
6087 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
6088 if (action == PF_PASS) {
6090 pfsync_update_state(s);
6091 #endif /* NPFSYNC */
6095 } else if (s == NULL)
6096 action = pf_test_rule(&r, &s, dir, kif,
6097 m, off, h, &pd, &a, &ruleset, NULL, inp);
6101 case IPPROTO_ICMPV6: {
6102 struct icmp6_hdr ih;
6105 if (!pf_pull_hdr(m, off, &ih, sizeof(ih),
6106 &action, &reason, AF_INET6)) {
6107 log = action != PF_PASS;
6110 action = pf_test_state_icmp(&s, dir, kif,
6111 m, off, h, &pd, &reason);
6112 if (action == PF_PASS) {
6114 pfsync_update_state(s);
6115 #endif /* NPFSYNC */
6119 } else if (s == NULL)
6120 action = pf_test_rule(&r, &s, dir, kif,
6121 m, off, h, &pd, &a, &ruleset, NULL, inp);
6126 action = pf_test_state_other(&s, dir, kif, &pd);
6127 if (action == PF_PASS) {
6129 pfsync_update_state(s);
6130 #endif /* NPFSYNC */
6134 } else if (s == NULL)
6135 action = pf_test_rule(&r, &s, dir, kif, m, off, h,
6136 &pd, &a, &ruleset, NULL, inp);
6146 /* handle dangerous IPv6 extension headers. */
6147 if (action == PF_PASS && rh_cnt &&
6148 !((s && s->allow_opts) || r->allow_opts)) {
6150 REASON_SET(&reason, PFRES_IPOPTIONS);
6152 DPFPRINTF(PF_DEBUG_MISC,
6153 ("pf: dropping packet with dangerous v6 headers\n"));
6156 if ((s && s->tag) || r->rtableid)
6157 pf_tag_packet(m, s ? s->tag : 0, r->rtableid);
6160 if (action == PF_PASS && r->qid) {
6161 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
6162 if (pd.tos & IPTOS_LOWDELAY)
6163 m->m_pkthdr.pf.qid = r->pqid;
6165 m->m_pkthdr.pf.qid = r->qid;
6166 m->m_pkthdr.pf.ecn_af = AF_INET6;
6167 m->m_pkthdr.pf.hdr = h;
6170 m->m_pkthdr.pf.state_hash = s->hash;
6171 m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED;
6176 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
6177 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
6178 (s->nat_rule.ptr->action == PF_RDR ||
6179 s->nat_rule.ptr->action == PF_BINAT) &&
6180 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6))
6181 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST;
6186 if (s != NULL && s->nat_rule.ptr != NULL &&
6187 s->nat_rule.ptr->log & PF_LOG_ALL)
6188 lr = s->nat_rule.ptr;
6191 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset,
6195 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6196 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;
6198 if (action == PF_PASS || r->action == PF_DROP) {
6199 dirndx = (dir == PF_OUT);
6200 r->packets[dirndx]++;
6201 r->bytes[dirndx] += pd.tot_len;
6203 a->packets[dirndx]++;
6204 a->bytes[dirndx] += pd.tot_len;
6208 if (s->nat_rule.ptr != NULL) {
6209 s->nat_rule.ptr->packets[dirndx]++;
6210 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6212 if (s->src_node != NULL) {
6213 s->src_node->packets[dirndx]++;
6214 s->src_node->bytes[dirndx] += pd.tot_len;
6216 if (s->nat_src_node != NULL) {
6217 s->nat_src_node->packets[dirndx]++;
6218 s->nat_src_node->bytes[dirndx] += pd.tot_len;
6220 dirndx = (dir == sk->direction) ? 0 : 1;
6221 s->packets[dirndx]++;
6222 s->bytes[dirndx] += pd.tot_len;
6225 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6229 * XXX: we need to make sure that the addresses
6230 * passed to pfr_update_stats() are the same than
6231 * the addresses used during matching (pfr_match)
6233 if (r == &pf_default_rule) {
6235 x = (s == NULL || sk->direction == dir) ?
6236 &pd.baddr : &pd.naddr;
6238 x = (s == NULL || sk->direction == dir) ?
6239 &pd.naddr : &pd.baddr;
6241 if (x == &pd.baddr || s == NULL) {
6248 if (tr->src.addr.type == PF_ADDR_TABLE)
6249 pfr_update_stats(tr->src.addr.p.tbl, (sk == NULL ||
6250 sk->direction == dir) ? pd.src : pd.dst, pd.af,
6251 pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
6253 if (tr->dst.addr.type == PF_ADDR_TABLE)
6254 pfr_update_stats(tr->dst.addr.p.tbl, (sk == NULL ||
6255 sk->direction == dir) ? pd.dst : pd.src, pd.af,
6256 pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
6261 if (action == PF_SYNPROXY_DROP) {
6266 /* pf_route6 can free the mbuf causing *m0 to become NULL */
6267 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd);
6274 pf_check_congestion(struct ifqueue *ifq)