1 /* $FreeBSD: src/sys/contrib/pf/net/pf.c,v 1.19 2004/09/11 11:18:25 mlaier Exp $ */
2 /* $OpenBSD: pf.c,v 1.433.2.2 2004/07/17 03:22:34 brad Exp $ */
3 /* add $OpenBSD: pf.c,v 1.448 2004/05/11 07:34:11 dhartmei Exp $ */
4 /* $DragonFly: src/sys/net/pf/pf.c,v 1.20 2008/06/05 18:06:32 swildner Exp $ */
5 /* $OpenBSD: pf.c,v 1.527 2007/02/22 15:23:23 pyr Exp $ */
8 * Copyright (c) 2004 The DragonFly Project. All rights reserved.
10 * Copyright (c) 2001 Daniel Hartmeier
11 * Copyright (c) 2002,2003 Henning Brauer
12 * All rights reserved.
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
18 * - Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials provided
23 * with the distribution.
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
28 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
29 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
30 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
31 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
32 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
33 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
35 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
38 * Effort sponsored in part by the Defense Advanced Research Projects
39 * Agency (DARPA) and Air Force Research Laboratory, Air Force
40 * Materiel Command, USAF, under agreement number F30602-01-2-0537.
45 #include "opt_inet6.h"
46 #include "use_pfsync.h"
48 #include <sys/param.h>
49 #include <sys/systm.h>
50 #include <sys/malloc.h>
52 #include <sys/filio.h>
53 #include <sys/socket.h>
54 #include <sys/socketvar.h>
55 #include <sys/kernel.h>
57 #include <sys/sysctl.h>
58 #include <sys/endian.h>
59 #include <vm/vm_zone.h>
61 #include <sys/kthread.h>
63 #include <machine/inttypes.h>
66 #include <net/if_types.h>
68 #include <net/netisr.h>
69 #include <net/route.h>
71 #include <netinet/in.h>
72 #include <netinet/in_var.h>
73 #include <netinet/in_systm.h>
74 #include <netinet/ip.h>
75 #include <netinet/ip_var.h>
76 #include <netinet/tcp.h>
77 #include <netinet/tcp_seq.h>
78 #include <netinet/udp.h>
79 #include <netinet/ip_icmp.h>
80 #include <netinet/in_pcb.h>
81 #include <netinet/tcp_timer.h>
82 #include <netinet/tcp_var.h>
83 #include <netinet/udp_var.h>
84 #include <netinet/icmp_var.h>
85 #include <netinet/if_ether.h>
87 #include <net/pf/pfvar.h>
88 #include <net/pf/if_pflog.h>
91 #include <net/pf/if_pfsync.h>
92 #endif /* NPFSYNC > 0 */
95 #include <netinet/ip6.h>
96 #include <netinet/in_pcb.h>
97 #include <netinet/icmp6.h>
98 #include <netinet6/nd6.h>
99 #include <netinet6/ip6_var.h>
100 #include <netinet6/in6_pcb.h>
103 #include <sys/in_cksum.h>
104 #include <sys/ucred.h>
105 #include <machine/limits.h>
106 #include <sys/msgport2.h>
107 #include <net/netmsg2.h>
109 extern int ip_optcopy(struct ip *, struct ip *);
110 extern int debug_pfugidhack;
112 #define DPFPRINTF(n, x) if (pf_status.debug >= (n)) kprintf x
118 struct pf_altqqueue pf_altqs[2];
119 struct pf_palist pf_pabuf;
120 struct pf_altqqueue *pf_altqs_active;
121 struct pf_altqqueue *pf_altqs_inactive;
122 struct pf_status pf_status;
124 u_int32_t ticket_altqs_active;
125 u_int32_t ticket_altqs_inactive;
126 int altqs_inactive_open;
127 u_int32_t ticket_pabuf;
129 struct pf_anchor_stackframe {
130 struct pf_ruleset *rs;
132 struct pf_anchor_node *parent;
133 struct pf_anchor *child;
134 } pf_anchor_stack[64];
136 vm_zone_t pf_src_tree_pl, pf_rule_pl;
137 vm_zone_t pf_state_pl, pf_altq_pl, pf_pooladdr_pl;
139 void pf_print_host(struct pf_addr *, u_int16_t, u_int8_t);
141 void pf_init_threshold(struct pf_threshold *, u_int32_t,
143 void pf_add_threshold(struct pf_threshold *);
144 int pf_check_threshold(struct pf_threshold *);
146 void pf_change_ap(struct pf_addr *, u_int16_t *,
147 u_int16_t *, u_int16_t *, struct pf_addr *,
148 u_int16_t, u_int8_t, sa_family_t);
149 int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *,
150 struct tcphdr *, struct pf_state_peer *);
152 void pf_change_a6(struct pf_addr *, u_int16_t *,
153 struct pf_addr *, u_int8_t);
155 void pf_change_icmp(struct pf_addr *, u_int16_t *,
156 struct pf_addr *, struct pf_addr *, u_int16_t,
157 u_int16_t *, u_int16_t *, u_int16_t *,
158 u_int16_t *, u_int8_t, sa_family_t);
159 void pf_send_tcp(const struct pf_rule *, sa_family_t,
160 const struct pf_addr *, const struct pf_addr *,
161 u_int16_t, u_int16_t, u_int32_t, u_int32_t,
162 u_int8_t, u_int16_t, u_int16_t, u_int8_t, int,
163 u_int16_t, struct ether_header *, struct ifnet *);
164 void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
165 sa_family_t, struct pf_rule *);
166 struct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *,
167 int, int, struct pfi_kif *,
168 struct pf_addr *, u_int16_t, struct pf_addr *,
170 struct pf_rule *pf_get_translation(struct pf_pdesc *, struct mbuf *,
171 int, int, struct pfi_kif *, struct pf_src_node **,
172 struct pf_addr *, u_int16_t,
173 struct pf_addr *, u_int16_t,
174 struct pf_addr *, u_int16_t *);
175 int pf_test_tcp(struct pf_rule **, struct pf_state **,
176 int, struct pfi_kif *, struct mbuf *, int,
177 void *, struct pf_pdesc *, struct pf_rule **,
178 struct pf_ruleset **, struct ifqueue *, struct inpcb *);
179 int pf_test_udp(struct pf_rule **, struct pf_state **,
180 int, struct pfi_kif *, struct mbuf *, int,
181 void *, struct pf_pdesc *, struct pf_rule **,
182 struct pf_ruleset **, struct ifqueue *, struct inpcb *);
183 int pf_test_icmp(struct pf_rule **, struct pf_state **,
184 int, struct pfi_kif *, struct mbuf *, int,
185 void *, struct pf_pdesc *, struct pf_rule **,
186 struct pf_ruleset **, struct ifqueue *);
187 int pf_test_other(struct pf_rule **, struct pf_state **,
188 int, struct pfi_kif *, struct mbuf *, int, void *,
189 struct pf_pdesc *, struct pf_rule **,
190 struct pf_ruleset **, struct ifqueue *);
191 int pf_test_fragment(struct pf_rule **, int,
192 struct pfi_kif *, struct mbuf *, void *,
193 struct pf_pdesc *, struct pf_rule **,
194 struct pf_ruleset **);
195 int pf_test_state_tcp(struct pf_state **, int,
196 struct pfi_kif *, struct mbuf *, int,
197 void *, struct pf_pdesc *, u_short *);
198 int pf_test_state_udp(struct pf_state **, int,
199 struct pfi_kif *, struct mbuf *, int,
200 void *, struct pf_pdesc *);
201 int pf_test_state_icmp(struct pf_state **, int,
202 struct pfi_kif *, struct mbuf *, int,
203 void *, struct pf_pdesc *, u_short *);
204 int pf_test_state_other(struct pf_state **, int,
205 struct pfi_kif *, struct pf_pdesc *);
206 int pf_match_tag(struct mbuf *, struct pf_rule *,
207 struct pf_mtag *, 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_recurse(struct pfi_kif *,
239 struct pf_state_cmp *, u_int8_t);
240 int pf_src_connlimit(struct pf_state **);
241 int pf_check_congestion(struct ifqueue *);
243 extern int pf_end_threads;
245 struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = {
246 { &pf_state_pl, PFSTATE_HIWAT },
247 { &pf_src_tree_pl, PFSNODE_HIWAT },
248 { &pf_frent_pl, PFFRAG_FRENT_HIWAT },
249 { &pfr_ktable_pl, PFR_KTABLE_HIWAT },
250 { &pfr_kentry_pl, PFR_KENTRY_HIWAT }
253 #define STATE_LOOKUP() \
255 if (direction == PF_IN) \
256 *state = pf_find_state_recurse( \
257 kif, &key, PF_EXT_GWY); \
259 *state = pf_find_state_recurse( \
260 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(s) \
274 (s)->lan.addr.addr32[0] != (s)->gwy.addr.addr32[0] || \
275 ((s)->af == AF_INET6 && \
276 ((s)->lan.addr.addr32[1] != (s)->gwy.addr.addr32[1] || \
277 (s)->lan.addr.addr32[2] != (s)->gwy.addr.addr32[2] || \
278 (s)->lan.addr.addr32[3] != (s)->gwy.addr.addr32[3])) || \
279 (s)->lan.port != (s)->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 *,
305 static __inline int pf_state_compare_ext_gwy(struct pf_state *,
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,
317 u.s.entry_lan_ext, pf_state_compare_lan_ext);
318 RB_GENERATE(pf_state_tree_ext_gwy, pf_state,
319 u.s.entry_ext_gwy, pf_state_compare_ext_gwy);
320 RB_GENERATE(pf_state_tree_id, pf_state,
321 u.s.entry_id, pf_state_compare_id);
324 pf_src_compare(struct pf_src_node *a, struct pf_src_node *b)
328 if (a->rule.ptr > b->rule.ptr)
330 if (a->rule.ptr < b->rule.ptr)
332 if ((diff = a->af - b->af) != 0)
337 if (a->addr.addr32[0] > b->addr.addr32[0])
339 if (a->addr.addr32[0] < b->addr.addr32[0])
345 if (a->addr.addr32[3] > b->addr.addr32[3])
347 if (a->addr.addr32[3] < b->addr.addr32[3])
349 if (a->addr.addr32[2] > b->addr.addr32[2])
351 if (a->addr.addr32[2] < b->addr.addr32[2])
353 if (a->addr.addr32[1] > b->addr.addr32[1])
355 if (a->addr.addr32[1] < b->addr.addr32[1])
357 if (a->addr.addr32[0] > b->addr.addr32[0])
359 if (a->addr.addr32[0] < b->addr.addr32[0])
368 pf_state_hash(struct pf_state *s)
370 u_int32_t hv = (intptr_t)s / sizeof(*s);
372 hv ^= crc32(&s->lan, sizeof(s->lan));
373 hv ^= crc32(&s->gwy, sizeof(s->gwy));
374 hv ^= crc32(&s->ext, sizeof(s->ext));
375 if (hv == 0) /* disallow 0 */
381 pf_state_compare_lan_ext(struct pf_state *a, struct pf_state *b)
385 if ((diff = a->proto - b->proto) != 0)
387 if ((diff = a->af - b->af) != 0)
392 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0])
394 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0])
396 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
398 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
404 if (a->lan.addr.addr32[3] > b->lan.addr.addr32[3])
406 if (a->lan.addr.addr32[3] < b->lan.addr.addr32[3])
408 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3])
410 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3])
412 if (a->lan.addr.addr32[2] > b->lan.addr.addr32[2])
414 if (a->lan.addr.addr32[2] < b->lan.addr.addr32[2])
416 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2])
418 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2])
420 if (a->lan.addr.addr32[1] > b->lan.addr.addr32[1])
422 if (a->lan.addr.addr32[1] < b->lan.addr.addr32[1])
424 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1])
426 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1])
428 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0])
430 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0])
432 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
434 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
440 if ((diff = a->lan.port - b->lan.port) != 0)
442 if ((diff = a->ext.port - b->ext.port) != 0)
449 pf_state_compare_ext_gwy(struct pf_state *a, struct pf_state *b)
453 if ((diff = a->proto - b->proto) != 0)
455 if ((diff = a->af - b->af) != 0)
460 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
462 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
464 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0])
466 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0])
472 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3])
474 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3])
476 if (a->gwy.addr.addr32[3] > b->gwy.addr.addr32[3])
478 if (a->gwy.addr.addr32[3] < b->gwy.addr.addr32[3])
480 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2])
482 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2])
484 if (a->gwy.addr.addr32[2] > b->gwy.addr.addr32[2])
486 if (a->gwy.addr.addr32[2] < b->gwy.addr.addr32[2])
488 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1])
490 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1])
492 if (a->gwy.addr.addr32[1] > b->gwy.addr.addr32[1])
494 if (a->gwy.addr.addr32[1] < b->gwy.addr.addr32[1])
496 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
498 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
500 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0])
502 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0])
508 if ((diff = a->ext.port - b->ext.port) != 0)
510 if ((diff = a->gwy.port - b->gwy.port) != 0)
517 pf_state_compare_id(struct pf_state *a, struct pf_state *b)
523 if (a->creatorid > b->creatorid)
525 if (a->creatorid < b->creatorid)
533 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
538 dst->addr32[0] = src->addr32[0];
542 dst->addr32[0] = src->addr32[0];
543 dst->addr32[1] = src->addr32[1];
544 dst->addr32[2] = src->addr32[2];
545 dst->addr32[3] = src->addr32[3];
552 pf_find_state_byid(struct pf_state_cmp *key)
554 pf_status.fcounters[FCNT_STATE_SEARCH]++;
555 return (RB_FIND(pf_state_tree_id, &tree_id, (struct pf_state *)key));
559 pf_find_state_recurse(struct pfi_kif *kif, struct pf_state_cmp *key, u_int8_t tree)
563 pf_status.fcounters[FCNT_STATE_SEARCH]++;
567 if ((s = RB_FIND(pf_state_tree_lan_ext, &kif->pfik_lan_ext,
568 (struct pf_state *)key)) != NULL)
570 if ((s = RB_FIND(pf_state_tree_lan_ext, &pfi_all->pfik_lan_ext,
571 (struct pf_state *)key)) != NULL)
575 if ((s = RB_FIND(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy,
576 (struct pf_state *)key)) != NULL)
578 if ((s = RB_FIND(pf_state_tree_ext_gwy, &pfi_all->pfik_ext_gwy,
579 (struct pf_state *)key)) != NULL)
583 panic("pf_find_state_recurse");
588 pf_find_state_all(struct pf_state_cmp *key, u_int8_t tree, int *more)
590 struct pf_state *s, *ss = NULL;
593 pf_status.fcounters[FCNT_STATE_SEARCH]++;
597 TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) {
598 s = RB_FIND(pf_state_tree_lan_ext,
599 &kif->pfik_lan_ext, (struct pf_state *)key);
609 TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) {
610 s = RB_FIND(pf_state_tree_ext_gwy,
611 &kif->pfik_ext_gwy, (struct pf_state *)key);
621 panic("pf_find_state_all");
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)
661 (*state)->src_node->conn++;
662 (*state)->src.tcp_est = 1;
663 pf_add_threshold(&(*state)->src_node->conn_rate);
665 if ((*state)->rule.ptr->max_src_conn &&
666 (*state)->rule.ptr->max_src_conn <
667 (*state)->src_node->conn) {
668 pf_status.lcounters[LCNT_SRCCONN]++;
672 if ((*state)->rule.ptr->max_src_conn_rate.limit &&
673 pf_check_threshold(&(*state)->src_node->conn_rate)) {
674 pf_status.lcounters[LCNT_SRCCONNRATE]++;
681 if ((*state)->rule.ptr->overload_tbl) {
683 u_int32_t killed = 0;
685 pf_status.lcounters[LCNT_OVERLOAD_TABLE]++;
686 if (pf_status.debug >= PF_DEBUG_MISC) {
687 kprintf("pf_src_connlimit: blocking address ");
688 pf_print_host(&(*state)->src_node->addr, 0,
692 bzero(&p, sizeof(p));
693 p.pfra_af = (*state)->af;
694 switch ((*state)->af) {
698 p.pfra_ip4addr = (*state)->src_node->addr.v4;
704 p.pfra_ip6addr = (*state)->src_node->addr.v6;
709 pfr_insert_kentry((*state)->rule.ptr->overload_tbl,
712 /* kill existing states if that's required. */
713 if ((*state)->rule.ptr->flush) {
714 pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++;
716 RB_FOREACH(s, pf_state_tree_id, &tree_id) {
718 * Kill states from this source. (Only those
719 * from the same rule if PF_FLUSH_GLOBAL is not
722 if (s->af == (*state)->af &&
723 (((*state)->direction == PF_OUT &&
724 PF_AEQ(&(*state)->src_node->addr,
725 &s->lan.addr, s->af)) ||
726 ((*state)->direction == PF_IN &&
727 PF_AEQ(&(*state)->src_node->addr,
728 &s->ext.addr, s->af))) &&
729 ((*state)->rule.ptr->flush &
731 (*state)->rule.ptr == s->rule.ptr)) {
732 s->timeout = PFTM_PURGE;
733 s->src.state = s->dst.state =
738 if (pf_status.debug >= PF_DEBUG_MISC)
739 kprintf(", %u states killed", killed);
741 if (pf_status.debug >= PF_DEBUG_MISC)
745 /* kill this state */
746 (*state)->timeout = PFTM_PURGE;
747 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
752 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
753 struct pf_addr *src, sa_family_t af)
755 struct pf_src_node k;
759 PF_ACPY(&k.addr, src, af);
760 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
761 rule->rpool.opts & PF_POOL_STICKYADDR)
765 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
766 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
769 if (!rule->max_src_nodes ||
770 rule->src_nodes < rule->max_src_nodes)
771 (*sn) = pool_get(&pf_src_tree_pl, PR_NOWAIT);
773 pf_status.lcounters[LCNT_SRCNODES]++;
776 bzero(*sn, sizeof(struct pf_src_node));
778 pf_init_threshold(&(*sn)->conn_rate,
779 rule->max_src_conn_rate.limit,
780 rule->max_src_conn_rate.seconds);
783 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
784 rule->rpool.opts & PF_POOL_STICKYADDR)
785 (*sn)->rule.ptr = rule;
787 (*sn)->rule.ptr = NULL;
788 PF_ACPY(&(*sn)->addr, src, af);
789 if (RB_INSERT(pf_src_tree,
790 &tree_src_tracking, *sn) != NULL) {
791 if (pf_status.debug >= PF_DEBUG_MISC) {
792 kprintf("pf: src_tree insert failed: ");
793 pf_print_host(&(*sn)->addr, 0, af);
796 pool_put(&pf_src_tree_pl, *sn);
799 (*sn)->creation = time_second;
800 (*sn)->ruletype = rule->action;
801 if ((*sn)->rule.ptr != NULL)
802 (*sn)->rule.ptr->src_nodes++;
803 pf_status.scounters[SCNT_SRC_NODE_INSERT]++;
804 pf_status.src_nodes++;
806 if (rule->max_src_states &&
807 (*sn)->states >= rule->max_src_states) {
808 pf_status.lcounters[LCNT_SRCSTATES]++;
816 pf_insert_state(struct pfi_kif *kif, struct pf_state *state)
818 /* Thou MUST NOT insert multiple duplicate keys */
819 state->u.s.kif = kif;
820 if (RB_INSERT(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state)) {
821 if (pf_status.debug >= PF_DEBUG_MISC) {
822 kprintf("pf: state insert failed: tree_lan_ext");
824 pf_print_host(&state->lan.addr, state->lan.port,
827 pf_print_host(&state->gwy.addr, state->gwy.port,
830 pf_print_host(&state->ext.addr, state->ext.port,
832 if (state->sync_flags & PFSTATE_FROMSYNC)
833 kprintf(" (from sync)");
839 if (RB_INSERT(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state)) {
840 if (pf_status.debug >= PF_DEBUG_MISC) {
841 kprintf("pf: state insert failed: tree_ext_gwy");
843 pf_print_host(&state->lan.addr, state->lan.port,
846 pf_print_host(&state->gwy.addr, state->gwy.port,
849 pf_print_host(&state->ext.addr, state->ext.port,
851 if (state->sync_flags & PFSTATE_FROMSYNC)
852 kprintf(" (from sync)");
855 RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state);
859 if (state->id == 0 && state->creatorid == 0) {
860 state->id = htobe64(pf_status.stateid++);
861 state->creatorid = pf_status.hostid;
863 if (RB_INSERT(pf_state_tree_id, &tree_id, state) != NULL) {
864 if (pf_status.debug >= PF_DEBUG_MISC) {
865 kprintf("pf: state insert failed: "
866 "id: %016" PRIx64 " creatorid: %08" PRIx32,
867 be64toh(state->id), ntohl(state->creatorid));
868 if (state->sync_flags & PFSTATE_FROMSYNC)
869 kprintf(" (from sync)");
872 RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state);
873 RB_REMOVE(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state);
876 TAILQ_INSERT_TAIL(&state_list, state, u.s.entry_list);
877 pf_status.fcounters[FCNT_STATE_INSERT]++;
879 pfi_kif_ref(kif, PFI_KIF_REF_STATE);
881 pfsync_insert_state(state);
887 pf_purge_thread(void *v)
893 tsleep(pf_purge_thread, PWAIT, "pftm", 1 * hz);
895 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
897 if (pf_end_threads) {
898 pf_purge_expired_states(pf_status.states, 1);
899 pf_purge_expired_fragments();
900 pf_purge_expired_src_nodes(1);
903 lockmgr(&pf_consistency_lock, LK_RELEASE);
904 wakeup(pf_purge_thread);
909 /* process a fraction of the state table every second */
910 if(!pf_purge_expired_states(1 + (pf_status.states
911 / pf_default_rule.timeout[PFTM_INTERVAL]), 0)) {
913 pf_purge_expired_states(1 + (pf_status.states
914 / pf_default_rule.timeout[PFTM_INTERVAL]), 1);
917 /* purge other expired types every PFTM_INTERVAL seconds */
918 if (++nloops >= pf_default_rule.timeout[PFTM_INTERVAL]) {
919 pf_purge_expired_fragments();
920 if (!pf_purge_expired_src_nodes(locked)) {
921 pf_purge_expired_src_nodes(1);
926 lockmgr(&pf_consistency_lock, LK_RELEASE);
931 pf_state_expires(const struct pf_state *state)
938 /* handle all PFTM_* > PFTM_MAX here */
939 if (state->timeout == PFTM_PURGE)
940 return (time_second);
941 if (state->timeout == PFTM_UNTIL_PACKET)
943 KKASSERT(state->timeout != PFTM_UNLINKED);
944 KASSERT((state->timeout < PFTM_MAX),
945 ("pf_state_expires: timeout > PFTM_MAX"));
946 timeout = state->rule.ptr->timeout[state->timeout];
948 timeout = pf_default_rule.timeout[state->timeout];
949 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
951 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
952 states = state->rule.ptr->states;
954 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START];
955 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END];
956 states = pf_status.states;
958 if (end && states > start && start < end) {
960 return (state->expire + timeout * (end - states) /
963 return (time_second);
965 return (state->expire + timeout);
969 pf_purge_expired_src_nodes(int waslocked)
971 struct pf_src_node *cur, *next;
972 int locked = waslocked;
974 for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) {
975 next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur);
977 if (cur->states <= 0 && cur->expire <= time_second) {
979 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
980 next = RB_NEXT(pf_src_tree,
981 &tree_src_tracking, cur);
984 if (cur->rule.ptr != NULL) {
985 cur->rule.ptr->src_nodes--;
986 if (cur->rule.ptr->states <= 0 &&
987 cur->rule.ptr->max_src_nodes <= 0)
988 pf_rm_rule(NULL, cur->rule.ptr);
990 RB_REMOVE(pf_src_tree, &tree_src_tracking, cur);
991 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
992 pf_status.src_nodes--;
993 pool_put(&pf_src_tree_pl, cur);
997 if (locked && !waslocked)
998 lockmgr(&pf_consistency_lock, LK_RELEASE);
1003 pf_src_tree_remove_state(struct pf_state *s)
1007 if (s->src_node != NULL) {
1008 if (s->proto == IPPROTO_TCP) {
1010 --s->src_node->conn;
1012 if (--s->src_node->states <= 0) {
1013 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
1016 pf_default_rule.timeout[PFTM_SRC_NODE];
1017 s->src_node->expire = time_second + timeout;
1020 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
1021 if (--s->nat_src_node->states <= 0) {
1022 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
1025 pf_default_rule.timeout[PFTM_SRC_NODE];
1026 s->nat_src_node->expire = time_second + timeout;
1029 s->src_node = s->nat_src_node = NULL;
1032 /* callers should be at crit_enter() */
1034 pf_unlink_state(struct pf_state *cur)
1036 if (cur->src.state == PF_TCPS_PROXY_DST) {
1037 pf_send_tcp(cur->rule.ptr, cur->af,
1038 &cur->ext.addr, &cur->lan.addr,
1039 cur->ext.port, cur->lan.port,
1040 cur->src.seqhi, cur->src.seqlo + 1,
1041 TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL);
1043 RB_REMOVE(pf_state_tree_ext_gwy,
1044 &cur->u.s.kif->pfik_ext_gwy, cur);
1045 RB_REMOVE(pf_state_tree_lan_ext,
1046 &cur->u.s.kif->pfik_lan_ext, cur);
1047 RB_REMOVE(pf_state_tree_id, &tree_id, cur);
1049 if (cur->creatorid == pf_status.hostid)
1050 pfsync_delete_state(cur);
1052 cur->timeout = PFTM_UNLINKED;
1053 pf_src_tree_remove_state(cur);
1056 /* callers should be at crit_enter() and hold the
1057 * write_lock on pf_consistency_lock */
1059 pf_free_state(struct pf_state *cur)
1062 if (pfsyncif != NULL &&
1063 (pfsyncif->sc_bulk_send_next == cur ||
1064 pfsyncif->sc_bulk_terminator == cur))
1067 KKASSERT(cur->timeout == PFTM_UNLINKED);
1068 if (--cur->rule.ptr->states <= 0 &&
1069 cur->rule.ptr->src_nodes <= 0)
1070 pf_rm_rule(NULL, cur->rule.ptr);
1071 if (cur->nat_rule.ptr != NULL)
1072 if (--cur->nat_rule.ptr->states <= 0 &&
1073 cur->nat_rule.ptr->src_nodes <= 0)
1074 pf_rm_rule(NULL, cur->nat_rule.ptr);
1075 if (cur->anchor.ptr != NULL)
1076 if (--cur->anchor.ptr->states <= 0)
1077 pf_rm_rule(NULL, cur->anchor.ptr);
1078 pf_normalize_tcp_cleanup(cur);
1079 pfi_kif_unref(cur->u.s.kif, PFI_KIF_REF_STATE);
1080 TAILQ_REMOVE(&state_list, cur, u.s.entry_list);
1082 pf_tag_unref(cur->tag);
1083 pool_put(&pf_state_pl, cur);
1084 pf_status.fcounters[FCNT_STATE_REMOVALS]++;
1089 pf_purge_expired_states(u_int32_t maxcheck, int waslocked)
1091 static struct pf_state *cur = NULL;
1092 struct pf_state *next;
1093 int locked = waslocked;
1095 while (maxcheck--) {
1096 /* wrap to start of list when we hit the end */
1098 cur = TAILQ_FIRST(&state_list);
1100 break; /* list empty */
1103 /* get next state, as cur may get deleted */
1104 next = TAILQ_NEXT(cur, u.s.entry_list);
1106 if (cur->timeout == PFTM_UNLINKED) {
1107 /* free unlinked state */
1109 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
1113 } else if (pf_state_expires(cur) <= time_second) {
1114 /* unlink and free expired state */
1115 pf_unlink_state(cur);
1117 if (!lockmgr(&pf_consistency_lock, LK_EXCLUSIVE))
1127 lockmgr(&pf_consistency_lock, LK_RELEASE);
1132 pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw)
1134 if (aw->type != PF_ADDR_TABLE)
1136 if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL)
1142 pf_tbladdr_remove(struct pf_addr_wrap *aw)
1144 if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL)
1146 pfr_detach_table(aw->p.tbl);
1151 pf_tbladdr_copyout(struct pf_addr_wrap *aw)
1153 struct pfr_ktable *kt = aw->p.tbl;
1155 if (aw->type != PF_ADDR_TABLE || kt == NULL)
1157 if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL)
1158 kt = kt->pfrkt_root;
1160 aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ?
1165 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
1170 u_int32_t a = ntohl(addr->addr32[0]);
1171 kprintf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
1183 u_int8_t i, curstart = 255, curend = 0,
1184 maxstart = 0, maxend = 0;
1185 for (i = 0; i < 8; i++) {
1186 if (!addr->addr16[i]) {
1187 if (curstart == 255)
1193 if ((curend - curstart) >
1194 (maxend - maxstart)) {
1195 maxstart = curstart;
1202 for (i = 0; i < 8; i++) {
1203 if (i >= maxstart && i <= maxend) {
1212 b = ntohs(addr->addr16[i]);
1229 pf_print_state(struct pf_state *s)
1241 case IPPROTO_ICMPV6:
1245 kprintf("%u ", s->proto);
1248 pf_print_host(&s->lan.addr, s->lan.port, s->af);
1250 pf_print_host(&s->gwy.addr, s->gwy.port, s->af);
1252 pf_print_host(&s->ext.addr, s->ext.port, s->af);
1253 kprintf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo,
1254 s->src.seqhi, s->src.max_win, s->src.seqdiff);
1255 if (s->src.wscale && s->dst.wscale)
1256 kprintf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK);
1258 kprintf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo,
1259 s->dst.seqhi, s->dst.max_win, s->dst.seqdiff);
1260 if (s->src.wscale && s->dst.wscale)
1261 kprintf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK);
1263 kprintf(" %u:%u", s->src.state, s->dst.state);
1267 pf_print_flags(u_int8_t f)
1289 #define PF_SET_SKIP_STEPS(i) \
1291 while (head[i] != cur) { \
1292 head[i]->skip[i].ptr = cur; \
1293 head[i] = TAILQ_NEXT(head[i], entries); \
1298 pf_calc_skip_steps(struct pf_rulequeue *rules)
1300 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
1303 cur = TAILQ_FIRST(rules);
1305 for (i = 0; i < PF_SKIP_COUNT; ++i)
1307 while (cur != NULL) {
1309 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
1310 PF_SET_SKIP_STEPS(PF_SKIP_IFP);
1311 if (cur->direction != prev->direction)
1312 PF_SET_SKIP_STEPS(PF_SKIP_DIR);
1313 if (cur->af != prev->af)
1314 PF_SET_SKIP_STEPS(PF_SKIP_AF);
1315 if (cur->proto != prev->proto)
1316 PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
1317 if (cur->src.neg != prev->src.neg ||
1318 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
1319 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
1320 if (cur->src.port[0] != prev->src.port[0] ||
1321 cur->src.port[1] != prev->src.port[1] ||
1322 cur->src.port_op != prev->src.port_op)
1323 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
1324 if (cur->dst.neg != prev->dst.neg ||
1325 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
1326 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
1327 if (cur->dst.port[0] != prev->dst.port[0] ||
1328 cur->dst.port[1] != prev->dst.port[1] ||
1329 cur->dst.port_op != prev->dst.port_op)
1330 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
1333 cur = TAILQ_NEXT(cur, entries);
1335 for (i = 0; i < PF_SKIP_COUNT; ++i)
1336 PF_SET_SKIP_STEPS(i);
1340 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
1342 if (aw1->type != aw2->type)
1344 switch (aw1->type) {
1345 case PF_ADDR_ADDRMASK:
1346 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0))
1348 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0))
1351 case PF_ADDR_DYNIFTL:
1352 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
1353 case PF_ADDR_NOROUTE:
1354 case PF_ADDR_URPFFAILED:
1357 return (aw1->p.tbl != aw2->p.tbl);
1358 case PF_ADDR_RTLABEL:
1359 return (aw1->v.rtlabel != aw2->v.rtlabel);
1361 kprintf("invalid address type: %d\n", aw1->type);
1367 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
1373 l = cksum + old - new;
1374 l = (l >> 16) + (l & 65535);
1382 pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc,
1383 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af)
1388 PF_ACPY(&ao, a, af);
1396 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1397 ao.addr16[0], an->addr16[0], 0),
1398 ao.addr16[1], an->addr16[1], 0);
1400 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1401 ao.addr16[0], an->addr16[0], u),
1402 ao.addr16[1], an->addr16[1], u),
1408 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1409 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1410 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1411 ao.addr16[0], an->addr16[0], u),
1412 ao.addr16[1], an->addr16[1], u),
1413 ao.addr16[2], an->addr16[2], u),
1414 ao.addr16[3], an->addr16[3], u),
1415 ao.addr16[4], an->addr16[4], u),
1416 ao.addr16[5], an->addr16[5], u),
1417 ao.addr16[6], an->addr16[6], u),
1418 ao.addr16[7], an->addr16[7], u),
1426 /* Changes a u_int32_t. Uses a void * so there are no align restrictions */
1428 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
1432 memcpy(&ao, a, sizeof(ao));
1433 memcpy(a, &an, sizeof(u_int32_t));
1434 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
1435 ao % 65536, an % 65536, u);
1440 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
1444 PF_ACPY(&ao, a, AF_INET6);
1445 PF_ACPY(a, an, AF_INET6);
1447 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1448 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1449 pf_cksum_fixup(pf_cksum_fixup(*c,
1450 ao.addr16[0], an->addr16[0], u),
1451 ao.addr16[1], an->addr16[1], u),
1452 ao.addr16[2], an->addr16[2], u),
1453 ao.addr16[3], an->addr16[3], u),
1454 ao.addr16[4], an->addr16[4], u),
1455 ao.addr16[5], an->addr16[5], u),
1456 ao.addr16[6], an->addr16[6], u),
1457 ao.addr16[7], an->addr16[7], u);
1462 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
1463 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
1464 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
1466 struct pf_addr oia, ooa;
1468 PF_ACPY(&oia, ia, af);
1469 PF_ACPY(&ooa, oa, af);
1471 /* Change inner protocol port, fix inner protocol checksum. */
1473 u_int16_t oip = *ip;
1480 *pc = pf_cksum_fixup(*pc, oip, *ip, u);
1481 *ic = pf_cksum_fixup(*ic, oip, *ip, 0);
1483 *ic = pf_cksum_fixup(*ic, opc, *pc, 0);
1485 /* Change inner ip address, fix inner ip and icmp checksums. */
1486 PF_ACPY(ia, na, af);
1490 u_int32_t oh2c = *h2c;
1492 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
1493 oia.addr16[0], ia->addr16[0], 0),
1494 oia.addr16[1], ia->addr16[1], 0);
1495 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1496 oia.addr16[0], ia->addr16[0], 0),
1497 oia.addr16[1], ia->addr16[1], 0);
1498 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
1504 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1505 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1506 pf_cksum_fixup(pf_cksum_fixup(*ic,
1507 oia.addr16[0], ia->addr16[0], u),
1508 oia.addr16[1], ia->addr16[1], u),
1509 oia.addr16[2], ia->addr16[2], u),
1510 oia.addr16[3], ia->addr16[3], u),
1511 oia.addr16[4], ia->addr16[4], u),
1512 oia.addr16[5], ia->addr16[5], u),
1513 oia.addr16[6], ia->addr16[6], u),
1514 oia.addr16[7], ia->addr16[7], u);
1518 /* Change outer ip address, fix outer ip or icmpv6 checksum. */
1519 PF_ACPY(oa, na, af);
1523 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
1524 ooa.addr16[0], oa->addr16[0], 0),
1525 ooa.addr16[1], oa->addr16[1], 0);
1530 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1531 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1532 pf_cksum_fixup(pf_cksum_fixup(*ic,
1533 ooa.addr16[0], oa->addr16[0], u),
1534 ooa.addr16[1], oa->addr16[1], u),
1535 ooa.addr16[2], oa->addr16[2], u),
1536 ooa.addr16[3], oa->addr16[3], u),
1537 ooa.addr16[4], oa->addr16[4], u),
1538 ooa.addr16[5], oa->addr16[5], u),
1539 ooa.addr16[6], oa->addr16[6], u),
1540 ooa.addr16[7], oa->addr16[7], u);
1548 * Need to modulate the sequence numbers in the TCP SACK option
1549 * (credits to Krzysztof Pfaff for report and patch)
1552 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd,
1553 struct tcphdr *th, struct pf_state_peer *dst)
1555 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen;
1556 u_int8_t opts[TCP_MAXOLEN], *opt = opts;
1557 int copyback = 0, i, olen;
1558 struct raw_sackblock sack;
1560 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2)
1561 if (hlen < TCPOLEN_SACKLEN ||
1562 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af))
1565 while (hlen >= TCPOLEN_SACKLEN) {
1568 case TCPOPT_EOL: /* FALLTHROUGH */
1576 if (olen >= TCPOLEN_SACKLEN) {
1577 for (i = 2; i + TCPOLEN_SACK <= olen;
1578 i += TCPOLEN_SACK) {
1579 memcpy(&sack, &opt[i], sizeof(sack));
1580 pf_change_a(&sack.rblk_start, &th->th_sum,
1581 htonl(ntohl(sack.rblk_start) -
1583 pf_change_a(&sack.rblk_end, &th->th_sum,
1584 htonl(ntohl(sack.rblk_end) -
1586 memcpy(&opt[i], &sack, sizeof(sack));
1600 m_copyback(m, off + sizeof(*th), thoptlen, opts);
1605 pf_send_tcp(const struct pf_rule *r, sa_family_t af,
1606 const struct pf_addr *saddr, const struct pf_addr *daddr,
1607 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
1608 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag,
1609 u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp)
1614 struct ip *h = NULL;
1617 struct ip6_hdr *h6 = NULL;
1619 struct tcphdr *th = NULL;
1621 struct pf_mtag *pf_mtag;
1623 /* maximum segment size tcp option */
1624 tlen = sizeof(struct tcphdr);
1631 len = sizeof(struct ip) + tlen;
1636 len = sizeof(struct ip6_hdr) + tlen;
1641 /* create outgoing mbuf */
1642 m = m_gethdr(MB_DONTWAIT, MT_HEADER);
1645 if ((pf_mtag = pf_get_mtag(m)) == NULL) {
1650 pf_mtag->flags |= PF_TAG_GENERATED;
1652 pf_mtag->tag = rtag;
1654 if (r != NULL && r->rtableid >= 0)
1655 pf_mtag->rtableid = r->rtableid;
1658 if (r != NULL && r->qid) {
1659 pf_mtag->qid = r->qid;
1660 /* add hints for ecn */
1662 pf_mtag->hdr = mtod(m, struct ip *);
1665 m->m_data += max_linkhdr;
1666 m->m_pkthdr.len = m->m_len = len;
1667 m->m_pkthdr.rcvif = NULL;
1668 bzero(m->m_data, len);
1672 h = mtod(m, struct ip *);
1674 /* IP header fields included in the TCP checksum */
1675 h->ip_p = IPPROTO_TCP;
1677 h->ip_src.s_addr = saddr->v4.s_addr;
1678 h->ip_dst.s_addr = daddr->v4.s_addr;
1680 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
1685 h6 = mtod(m, struct ip6_hdr *);
1687 /* IP header fields included in the TCP checksum */
1688 h6->ip6_nxt = IPPROTO_TCP;
1689 h6->ip6_plen = htons(tlen);
1690 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
1691 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
1693 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
1699 th->th_sport = sport;
1700 th->th_dport = dport;
1701 th->th_seq = htonl(seq);
1702 th->th_ack = htonl(ack);
1703 th->th_off = tlen >> 2;
1704 th->th_flags = flags;
1705 th->th_win = htons(win);
1708 opt = (char *)(th + 1);
1709 opt[0] = TCPOPT_MAXSEG;
1712 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
1719 th->th_sum = in_cksum(m, len);
1721 /* Finish the IP header */
1723 h->ip_hl = sizeof(*h) >> 2;
1724 h->ip_tos = IPTOS_LOWDELAY;
1726 h->ip_off = path_mtu_discovery ? IP_DF : 0;
1727 h->ip_ttl = ttl ? ttl : ip_defttl;
1730 ip_output(m, NULL, NULL, 0, NULL, NULL);
1734 struct ether_header *e = (void *)ro.ro_dst.sa_data;
1742 ro.ro_dst.sa_len = sizeof(ro.ro_dst);
1743 ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT;
1744 bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN);
1745 bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN);
1746 e->ether_type = eh->ether_type;
1747 /* XXX_IMPORT: later */
1748 ip_output(m, (void *)NULL, &ro, 0,
1749 (void *)NULL, (void *)NULL);
1756 th->th_sum = in6_cksum(m, IPPROTO_TCP,
1757 sizeof(struct ip6_hdr), tlen);
1759 h6->ip6_vfc |= IPV6_VERSION;
1760 h6->ip6_hlim = IPV6_DEFHLIM;
1762 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
1769 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
1772 struct pf_mtag *pf_mtag;
1775 m0 = m_copy(m, 0, M_COPYALL);
1777 if ((pf_mtag = pf_get_mtag(m0)) == NULL)
1779 pf_mtag->flags |= PF_TAG_GENERATED;
1781 if (r->rtableid >= 0)
1782 pf_mtag->rtableid = r->rtableid;
1786 pf_mtag->qid = r->qid;
1787 /* add hints for ecn */
1789 pf_mtag->hdr = mtod(m0, struct ip *);
1796 icmp_error(m0, type, code, 0, 0);
1801 icmp6_error(m0, type, code, 0);
1808 * Return 1 if the addresses a and b match (with mask m), otherwise return 0.
1809 * If n is 0, they match if they are equal. If n is != 0, they match if they
1813 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
1814 struct pf_addr *b, sa_family_t af)
1821 if ((a->addr32[0] & m->addr32[0]) ==
1822 (b->addr32[0] & m->addr32[0]))
1828 if (((a->addr32[0] & m->addr32[0]) ==
1829 (b->addr32[0] & m->addr32[0])) &&
1830 ((a->addr32[1] & m->addr32[1]) ==
1831 (b->addr32[1] & m->addr32[1])) &&
1832 ((a->addr32[2] & m->addr32[2]) ==
1833 (b->addr32[2] & m->addr32[2])) &&
1834 ((a->addr32[3] & m->addr32[3]) ==
1835 (b->addr32[3] & m->addr32[3])))
1854 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
1858 return ((p > a1) && (p < a2));
1860 return ((p < a1) || (p > a2));
1862 return ((p >= a1) && (p <= a2));
1876 return (0); /* never reached */
1880 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
1885 return (pf_match(op, a1, a2, p));
1889 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
1891 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
1893 return (pf_match(op, a1, a2, u));
1897 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
1899 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
1901 return (pf_match(op, a1, a2, g));
1905 pf_find_mtag(struct mbuf *m)
1909 if ((mtag = m_tag_find(m, PF_MBUF_TAGGED, NULL)) == NULL)
1912 return ((struct pf_mtag *)(mtag + 1));
1916 pf_get_mtag(struct mbuf *m)
1920 if ((mtag = m_tag_find(m, PF_MBUF_TAGGED, NULL)) == NULL) {
1921 mtag = m_tag_get(PF_MBUF_TAGGED, sizeof(struct pf_mtag),
1925 bzero(mtag + 1, sizeof(struct pf_mtag));
1926 m_tag_prepend(m, mtag);
1929 return ((struct pf_mtag *)(mtag + 1));
1933 pf_match_tag(struct mbuf *m, struct pf_rule *r, struct pf_mtag *pf_mtag,
1937 *tag = pf_mtag->tag;
1939 return ((!r->match_tag_not && r->match_tag == *tag) ||
1940 (r->match_tag_not && r->match_tag != *tag));
1944 pf_tag_packet(struct mbuf *m, struct pf_mtag *pf_mtag, int tag, int rtableid)
1946 if (tag <= 0 && rtableid < 0)
1949 if (pf_mtag == NULL)
1950 if ((pf_mtag = pf_get_mtag(m)) == NULL)
1955 pf_mtag->rtableid = rtableid;
1961 pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n,
1962 struct pf_rule **r, struct pf_rule **a, int *match)
1964 struct pf_anchor_stackframe *f;
1966 (*r)->anchor->match = 0;
1969 if (*depth >= sizeof(pf_anchor_stack) /
1970 sizeof(pf_anchor_stack[0])) {
1971 kprintf("pf_step_into_anchor: stack overflow\n");
1972 *r = TAILQ_NEXT(*r, entries);
1974 } else if (*depth == 0 && a != NULL)
1976 f = pf_anchor_stack + (*depth)++;
1979 if ((*r)->anchor_wildcard) {
1980 f->parent = &(*r)->anchor->children;
1981 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) ==
1986 *rs = &f->child->ruleset;
1990 *rs = &(*r)->anchor->ruleset;
1992 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
1996 pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n,
1997 struct pf_rule **r, struct pf_rule **a, int *match)
1999 struct pf_anchor_stackframe *f;
2005 f = pf_anchor_stack + *depth - 1;
2006 if (f->parent != NULL && f->child != NULL) {
2007 if (f->child->match ||
2008 (match != NULL && *match)) {
2009 f->r->anchor->match = 1;
2012 f->child = RB_NEXT(pf_anchor_node, f->parent, f->child);
2013 if (f->child != NULL) {
2014 *rs = &f->child->ruleset;
2015 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2023 if (*depth == 0 && a != NULL)
2026 if (f->r->anchor->match || (match != NULL && *match))
2027 quick = f->r->quick;
2028 *r = TAILQ_NEXT(f->r, entries);
2029 } while (*r == NULL);
2036 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
2037 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
2042 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2043 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2047 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2048 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2049 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
2050 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
2051 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
2052 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
2053 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
2054 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
2060 pf_addr_inc(struct pf_addr *addr, sa_family_t af)
2065 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
2069 if (addr->addr32[3] == 0xffffffff) {
2070 addr->addr32[3] = 0;
2071 if (addr->addr32[2] == 0xffffffff) {
2072 addr->addr32[2] = 0;
2073 if (addr->addr32[1] == 0xffffffff) {
2074 addr->addr32[1] = 0;
2076 htonl(ntohl(addr->addr32[0]) + 1);
2079 htonl(ntohl(addr->addr32[1]) + 1);
2082 htonl(ntohl(addr->addr32[2]) + 1);
2085 htonl(ntohl(addr->addr32[3]) + 1);
2091 #define mix(a,b,c) \
2093 a -= b; a -= c; a ^= (c >> 13); \
2094 b -= c; b -= a; b ^= (a << 8); \
2095 c -= a; c -= b; c ^= (b >> 13); \
2096 a -= b; a -= c; a ^= (c >> 12); \
2097 b -= c; b -= a; b ^= (a << 16); \
2098 c -= a; c -= b; c ^= (b >> 5); \
2099 a -= b; a -= c; a ^= (c >> 3); \
2100 b -= c; b -= a; b ^= (a << 10); \
2101 c -= a; c -= b; c ^= (b >> 15); \
2105 * hash function based on bridge_hash in if_bridge.c
2108 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash,
2109 struct pf_poolhashkey *key, sa_family_t af)
2111 u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0];
2116 a += inaddr->addr32[0];
2119 hash->addr32[0] = c + key->key32[2];
2124 a += inaddr->addr32[0];
2125 b += inaddr->addr32[2];
2127 hash->addr32[0] = c;
2128 a += inaddr->addr32[1];
2129 b += inaddr->addr32[3];
2132 hash->addr32[1] = c;
2133 a += inaddr->addr32[2];
2134 b += inaddr->addr32[1];
2137 hash->addr32[2] = c;
2138 a += inaddr->addr32[3];
2139 b += inaddr->addr32[0];
2142 hash->addr32[3] = c;
2149 pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr,
2150 struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn)
2152 unsigned char hash[16];
2153 struct pf_pool *rpool = &r->rpool;
2154 struct pf_addr *raddr = &rpool->cur->addr.v.a.addr;
2155 struct pf_addr *rmask = &rpool->cur->addr.v.a.mask;
2156 struct pf_pooladdr *acur = rpool->cur;
2157 struct pf_src_node k;
2159 if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR &&
2160 (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
2162 PF_ACPY(&k.addr, saddr, af);
2163 if (r->rule_flag & PFRULE_RULESRCTRACK ||
2164 r->rpool.opts & PF_POOL_STICKYADDR)
2168 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
2169 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
2170 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) {
2171 PF_ACPY(naddr, &(*sn)->raddr, af);
2172 if (pf_status.debug >= PF_DEBUG_MISC) {
2173 kprintf("pf_map_addr: src tracking maps ");
2174 pf_print_host(&k.addr, 0, af);
2176 pf_print_host(naddr, 0, af);
2183 if (rpool->cur->addr.type == PF_ADDR_NOROUTE)
2185 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
2189 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
2190 (rpool->opts & PF_POOL_TYPEMASK) !=
2193 raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
2194 rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
2199 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
2200 (rpool->opts & PF_POOL_TYPEMASK) !=
2203 raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
2204 rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
2208 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
2209 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN)
2210 return (1); /* unsupported */
2212 raddr = &rpool->cur->addr.v.a.addr;
2213 rmask = &rpool->cur->addr.v.a.mask;
2216 switch (rpool->opts & PF_POOL_TYPEMASK) {
2218 PF_ACPY(naddr, raddr, af);
2220 case PF_POOL_BITMASK:
2221 PF_POOLMASK(naddr, raddr, rmask, saddr, af);
2223 case PF_POOL_RANDOM:
2224 if (init_addr != NULL && PF_AZERO(init_addr, af)) {
2228 rpool->counter.addr32[0] = htonl(karc4random());
2233 if (rmask->addr32[3] != 0xffffffff)
2234 rpool->counter.addr32[3] =
2235 htonl(karc4random());
2238 if (rmask->addr32[2] != 0xffffffff)
2239 rpool->counter.addr32[2] =
2240 htonl(karc4random());
2243 if (rmask->addr32[1] != 0xffffffff)
2244 rpool->counter.addr32[1] =
2245 htonl(karc4random());
2248 if (rmask->addr32[0] != 0xffffffff)
2249 rpool->counter.addr32[0] =
2250 htonl(karc4random());
2254 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
2255 PF_ACPY(init_addr, naddr, af);
2258 PF_AINC(&rpool->counter, af);
2259 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
2262 case PF_POOL_SRCHASH:
2263 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af);
2264 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af);
2266 case PF_POOL_ROUNDROBIN:
2267 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
2268 if (!pfr_pool_get(rpool->cur->addr.p.tbl,
2269 &rpool->tblidx, &rpool->counter,
2270 &raddr, &rmask, af))
2272 } 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))
2277 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
2281 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL)
2282 rpool->cur = TAILQ_FIRST(&rpool->list);
2283 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
2285 if (pfr_pool_get(rpool->cur->addr.p.tbl,
2286 &rpool->tblidx, &rpool->counter,
2287 &raddr, &rmask, af)) {
2288 /* table contains no address of type 'af' */
2289 if (rpool->cur != acur)
2293 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
2295 if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
2296 &rpool->tblidx, &rpool->counter,
2297 &raddr, &rmask, af)) {
2298 /* table contains no address of type 'af' */
2299 if (rpool->cur != acur)
2304 raddr = &rpool->cur->addr.v.a.addr;
2305 rmask = &rpool->cur->addr.v.a.mask;
2306 PF_ACPY(&rpool->counter, raddr, af);
2310 PF_ACPY(naddr, &rpool->counter, af);
2311 if (init_addr != NULL && PF_AZERO(init_addr, af))
2312 PF_ACPY(init_addr, naddr, af);
2313 PF_AINC(&rpool->counter, af);
2317 PF_ACPY(&(*sn)->raddr, naddr, af);
2319 if (pf_status.debug >= PF_DEBUG_MISC &&
2320 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
2321 kprintf("pf_map_addr: selected address ");
2322 pf_print_host(naddr, 0, af);
2330 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r,
2331 struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport,
2332 struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high,
2333 struct pf_src_node **sn)
2335 struct pf_state_cmp key;
2336 struct pf_addr init_addr;
2339 bzero(&init_addr, sizeof(init_addr));
2340 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
2343 if (proto == IPPROTO_ICMP) {
2351 PF_ACPY(&key.ext.addr, daddr, key.af);
2352 PF_ACPY(&key.gwy.addr, naddr, key.af);
2353 key.ext.port = dport;
2356 * port search; start random, step;
2357 * similar 2 portloop in in_pcbbind
2359 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP ||
2360 proto == IPPROTO_ICMP)) {
2361 key.gwy.port = dport;
2362 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL)
2364 } else if (low == 0 && high == 0) {
2365 key.gwy.port = *nport;
2366 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL)
2368 } else if (low == high) {
2369 key.gwy.port = htons(low);
2370 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) {
2371 *nport = htons(low);
2383 cut = htonl(karc4random()) % (1 + high - low) + low;
2384 /* low <= cut <= high */
2385 for (tmp = cut; tmp <= high; ++(tmp)) {
2386 key.gwy.port = htons(tmp);
2387 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) ==
2389 *nport = htons(tmp);
2393 for (tmp = cut - 1; tmp >= low; --(tmp)) {
2394 key.gwy.port = htons(tmp);
2395 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) ==
2397 *nport = htons(tmp);
2403 switch (r->rpool.opts & PF_POOL_TYPEMASK) {
2404 case PF_POOL_RANDOM:
2405 case PF_POOL_ROUNDROBIN:
2406 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
2410 case PF_POOL_SRCHASH:
2411 case PF_POOL_BITMASK:
2415 } while (! PF_AEQ(&init_addr, naddr, af) );
2417 return (1); /* none available */
2421 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
2422 int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport,
2423 struct pf_addr *daddr, u_int16_t dport, int rs_num)
2425 struct pf_rule *r, *rm = NULL;
2426 struct pf_ruleset *ruleset = NULL;
2431 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr);
2432 while (r && rm == NULL) {
2433 struct pf_rule_addr *src = NULL, *dst = NULL;
2434 struct pf_addr_wrap *xdst = NULL;
2436 if (r->action == PF_BINAT && direction == PF_IN) {
2438 if (r->rpool.cur != NULL)
2439 xdst = &r->rpool.cur->addr;
2446 if (pfi_kif_match(r->kif, kif) == r->ifnot)
2447 r = r->skip[PF_SKIP_IFP].ptr;
2448 else if (r->direction && r->direction != direction)
2449 r = r->skip[PF_SKIP_DIR].ptr;
2450 else if (r->af && r->af != pd->af)
2451 r = r->skip[PF_SKIP_AF].ptr;
2452 else if (r->proto && r->proto != pd->proto)
2453 r = r->skip[PF_SKIP_PROTO].ptr;
2454 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af,
2456 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR :
2457 PF_SKIP_DST_ADDR].ptr;
2458 else if (src->port_op && !pf_match_port(src->port_op,
2459 src->port[0], src->port[1], sport))
2460 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT :
2461 PF_SKIP_DST_PORT].ptr;
2462 else if (dst != NULL &&
2463 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL))
2464 r = r->skip[PF_SKIP_DST_ADDR].ptr;
2465 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af,
2467 r = TAILQ_NEXT(r, entries);
2468 else if (dst != NULL && dst->port_op &&
2469 !pf_match_port(dst->port_op, dst->port[0],
2470 dst->port[1], dport))
2471 r = r->skip[PF_SKIP_DST_PORT].ptr;
2472 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag))
2473 r = TAILQ_NEXT(r, entries);
2474 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto !=
2475 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m,
2476 off, pd->hdr.tcp), r->os_fingerprint)))
2477 r = TAILQ_NEXT(r, entries);
2481 if (r->rtableid >= 0)
2482 rtableid = r->rtableid;
2483 if (r->anchor == NULL) {
2486 pf_step_into_anchor(&asd, &ruleset, rs_num,
2490 pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r,
2493 if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid))
2495 if (rm != NULL && (rm->action == PF_NONAT ||
2496 rm->action == PF_NORDR || rm->action == PF_NOBINAT))
2502 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction,
2503 struct pfi_kif *kif, struct pf_src_node **sn,
2504 struct pf_addr *saddr, u_int16_t sport,
2505 struct pf_addr *daddr, u_int16_t dport,
2506 struct pf_addr *naddr, u_int16_t *nport)
2508 struct pf_rule *r = NULL;
2510 if (direction == PF_OUT) {
2511 r = pf_match_translation(pd, m, off, direction, kif, saddr,
2512 sport, daddr, dport, PF_RULESET_BINAT);
2514 r = pf_match_translation(pd, m, off, direction, kif,
2515 saddr, sport, daddr, dport, PF_RULESET_NAT);
2517 r = pf_match_translation(pd, m, off, direction, kif, saddr,
2518 sport, daddr, dport, PF_RULESET_RDR);
2520 r = pf_match_translation(pd, m, off, direction, kif,
2521 saddr, sport, daddr, dport, PF_RULESET_BINAT);
2525 switch (r->action) {
2531 if (pf_get_sport(pd->af, pd->proto, r, saddr,
2532 daddr, dport, naddr, nport, r->rpool.proxy_port[0],
2533 r->rpool.proxy_port[1], sn)) {
2534 DPFPRINTF(PF_DEBUG_MISC,
2535 ("pf: NAT proxy port allocation "
2537 r->rpool.proxy_port[0],
2538 r->rpool.proxy_port[1]));
2543 switch (direction) {
2545 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){
2549 if (r->rpool.cur->addr.p.dyn->
2553 &r->rpool.cur->addr.p.dyn->
2555 &r->rpool.cur->addr.p.dyn->
2562 if (r->rpool.cur->addr.p.dyn->
2566 &r->rpool.cur->addr.p.dyn->
2568 &r->rpool.cur->addr.p.dyn->
2576 &r->rpool.cur->addr.v.a.addr,
2577 &r->rpool.cur->addr.v.a.mask,
2581 if (r->src.addr.type == PF_ADDR_DYNIFTL) {
2585 if (r->src.addr.p.dyn->
2589 &r->src.addr.p.dyn->
2591 &r->src.addr.p.dyn->
2598 if (r->src.addr.p.dyn->
2602 &r->src.addr.p.dyn->
2604 &r->src.addr.p.dyn->
2612 &r->src.addr.v.a.addr,
2613 &r->src.addr.v.a.mask, daddr,
2619 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn))
2621 if ((r->rpool.opts & PF_POOL_TYPEMASK) ==
2623 PF_POOLMASK(naddr, naddr,
2624 &r->rpool.cur->addr.v.a.mask, daddr,
2626 if (r->rpool.proxy_port[1]) {
2627 u_int32_t tmp_nport;
2629 tmp_nport = ((ntohs(dport) -
2630 ntohs(r->dst.port[0])) %
2631 (r->rpool.proxy_port[1] -
2632 r->rpool.proxy_port[0] + 1)) +
2633 r->rpool.proxy_port[0];
2635 /* wrap around if necessary */
2636 if (tmp_nport > 65535)
2638 *nport = htons((u_int16_t)tmp_nport);
2639 } else if (r->rpool.proxy_port[0])
2640 *nport = htons(r->rpool.proxy_port[0]);
2652 struct netmsg_hashlookup {
2653 struct netmsg nm_netmsg;
2654 struct inpcb **nm_pinp;
2655 struct inpcbinfo *nm_pcbinfo;
2656 struct pf_addr *nm_saddr;
2657 struct pf_addr *nm_daddr;
2664 in_pcblookup_hash_handler(struct netmsg *msg0)
2666 struct netmsg_hashlookup *msg = (struct netmsg_hashlookup *)msg0;
2668 if (msg->nm_af == AF_INET)
2669 *msg->nm_pinp = in_pcblookup_hash(msg->nm_pcbinfo,
2670 msg->nm_saddr->v4, msg->nm_sport, msg->nm_daddr->v4,
2671 msg->nm_dport, INPLOOKUP_WILDCARD, NULL);
2674 *msg->nm_pinp = in6_pcblookup_hash(msg->nm_pcbinfo,
2675 &msg->nm_saddr->v6, msg->nm_sport, &msg->nm_daddr->v6,
2676 msg->nm_dport, INPLOOKUP_WILDCARD, NULL);
2678 lwkt_replymsg(&msg->nm_netmsg.nm_lmsg, 0);
2683 pf_socket_lookup(int direction, struct pf_pdesc *pd, struct inpcb *inp_arg)
2685 struct pf_addr *saddr, *daddr;
2686 u_int16_t sport, dport;
2687 struct inpcbinfo *pi;
2690 struct netmsg_hashlookup *msg = NULL;
2696 pd->lookup.uid = UID_MAX;
2697 pd->lookup.gid = GID_MAX;
2698 pd->lookup.pid = NO_PID;
2699 if (direction == PF_IN) {
2706 switch (pd->proto) {
2708 sport = pd->hdr.tcp->th_sport;
2709 dport = pd->hdr.tcp->th_dport;
2711 pi_cpu = tcp_addrcpu(saddr->v4.s_addr, sport, daddr->v4.s_addr, dport);
2712 pi = &tcbinfo[pi_cpu];
2715 * Our netstack runs lockless on MP systems
2716 * (only for TCP connections at the moment).
2718 * As we are not allowed to read another CPU's tcbinfo,
2719 * we have to ask that CPU via remote call to search the
2722 * Prepare a msg iff data belongs to another CPU.
2724 if (pi_cpu != mycpu->gd_cpuid) {
2725 msg = kmalloc(sizeof(*msg), M_LWKTMSG, M_INTWAIT);
2726 netmsg_init(&msg->nm_netmsg, NULL, &netisr_afree_rport,
2727 0, in_pcblookup_hash_handler);
2728 msg->nm_pinp = &inp;
2729 msg->nm_pcbinfo = pi;
2730 msg->nm_saddr = saddr;
2731 msg->nm_sport = sport;
2732 msg->nm_daddr = daddr;
2733 msg->nm_dport = dport;
2734 msg->nm_af = pd->af;
2739 sport = pd->hdr.udp->uh_sport;
2740 dport = pd->hdr.udp->uh_dport;
2746 if (direction != PF_IN) {
2758 * Query other CPU, second part
2760 * msg only gets initialized when:
2762 * 2) the info belongs to another CPU
2764 * Use some switch/case magic to avoid code duplication.
2769 inp = in6_pcblookup_hash(pi, &saddr->v6, sport,
2770 &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL);
2776 /* FALLTHROUGH if SMP and on other CPU */
2781 lwkt_sendmsg(tcp_cport(pi_cpu),
2782 &msg->nm_netmsg.nm_lmsg);
2786 inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4,
2787 dport, INPLOOKUP_WILDCARD, NULL);
2796 pd->lookup.uid = inp->inp_socket->so_cred->cr_uid;
2797 pd->lookup.gid = inp->inp_socket->so_cred->cr_groups[0];
2802 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
2806 u_int8_t *opt, optlen;
2807 u_int8_t wscale = 0;
2809 hlen = th_off << 2; /* hlen <= sizeof(hdr) */
2810 if (hlen <= sizeof(struct tcphdr))
2812 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
2814 opt = hdr + sizeof(struct tcphdr);
2815 hlen -= sizeof(struct tcphdr);
2825 if (wscale > TCP_MAX_WINSHIFT)
2826 wscale = TCP_MAX_WINSHIFT;
2827 wscale |= PF_WSCALE_FLAG;
2842 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
2846 u_int8_t *opt, optlen;
2847 u_int16_t mss = tcp_mssdflt;
2849 hlen = th_off << 2; /* hlen <= sizeof(hdr) */
2850 if (hlen <= sizeof(struct tcphdr))
2852 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
2854 opt = hdr + sizeof(struct tcphdr);
2855 hlen -= sizeof(struct tcphdr);
2856 while (hlen >= TCPOLEN_MAXSEG) {
2864 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
2880 pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer)
2883 struct sockaddr_in *dst;
2887 struct sockaddr_in6 *dst6;
2888 struct route_in6 ro6;
2890 struct rtentry *rt = NULL;
2892 u_int16_t mss = tcp_mssdflt;
2897 hlen = sizeof(struct ip);
2898 bzero(&ro, sizeof(ro));
2899 dst = (struct sockaddr_in *)&ro.ro_dst;
2900 dst->sin_family = AF_INET;
2901 dst->sin_len = sizeof(*dst);
2902 dst->sin_addr = addr->v4;
2903 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING));
2909 hlen = sizeof(struct ip6_hdr);
2910 bzero(&ro6, sizeof(ro6));
2911 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst;
2912 dst6->sin6_family = AF_INET6;
2913 dst6->sin6_len = sizeof(*dst6);
2914 dst6->sin6_addr = addr->v6;
2915 rtalloc_ign((struct route *)&ro6, (RTF_CLONING | RTF_PRCLONING));
2921 if (rt && rt->rt_ifp) {
2922 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr);
2923 mss = max(tcp_mssdflt, mss);
2926 mss = min(mss, offer);
2927 mss = max(mss, 64); /* sanity - at least max opt space */
2932 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr)
2934 struct pf_rule *r = s->rule.ptr;
2937 if (!r->rt || r->rt == PF_FASTROUTE)
2942 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL,
2944 s->rt_kif = r->rpool.cur->kif;
2949 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL,
2951 s->rt_kif = r->rpool.cur->kif;
2958 pf_test_tcp(struct pf_rule **rm, struct pf_state **sm, int direction,
2959 struct pfi_kif *kif, struct mbuf *m, int off, void *h,
2960 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm,
2961 struct ifqueue *ifq, struct inpcb *inp)
2963 struct pf_rule *nr = NULL;
2964 struct pf_addr *saddr = pd->src, *daddr = pd->dst;
2965 struct tcphdr *th = pd->hdr.tcp;
2966 u_int16_t bport, nport = 0;
2967 sa_family_t af = pd->af;
2968 struct pf_rule *r, *a = NULL;
2969 struct pf_ruleset *ruleset = NULL;
2970 struct pf_src_node *nsn = NULL;
2973 int tag = -1, rtableid = -1;
2974 u_int16_t mss = tcp_mssdflt;
2978 if (pf_check_congestion(ifq)) {
2979 REASON_SET(&reason, PFRES_CONGEST);
2984 pd->lookup.done = pf_socket_lookup(direction, pd, inp);
2985 else if (debug_pfugidhack) {
2987 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n"));
2988 pd->lookup.done = pf_socket_lookup(direction, pd, inp);
2993 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
2995 if (direction == PF_OUT) {
2996 bport = nport = th->th_sport;
2997 /* check outgoing packet for BINAT/NAT */
2998 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
2999 saddr, th->th_sport, daddr, th->th_dport,
3000 &pd->naddr, &nport)) != NULL) {
3001 PF_ACPY(&pd->baddr, saddr, af);
3002 pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
3003 &th->th_sum, &pd->naddr, nport, 0, af);
3010 bport = nport = th->th_dport;
3011 /* check incoming packet for BINAT/RDR */
3012 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
3013 saddr, th->th_sport, daddr, th->th_dport,
3014 &pd->naddr, &nport)) != NULL) {
3015 PF_ACPY(&pd->baddr, daddr, af);
3016 pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
3017 &th->th_sum, &pd->naddr, nport, 0, af);
3027 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3028 r = r->skip[PF_SKIP_IFP].ptr;
3029 else if (r->direction && r->direction != direction)
3030 r = r->skip[PF_SKIP_DIR].ptr;
3031 else if (r->af && r->af != af)
3032 r = r->skip[PF_SKIP_AF].ptr;
3033 else if (r->proto && r->proto != IPPROTO_TCP)
3034 r = r->skip[PF_SKIP_PROTO].ptr;
3035 else if (PF_MISMATCHAW(&r->src.addr, saddr, af,
3037 r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3038 else if (r->src.port_op && !pf_match_port(r->src.port_op,
3039 r->src.port[0], r->src.port[1], th->th_sport))
3040 r = r->skip[PF_SKIP_SRC_PORT].ptr;
3041 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af,
3043 r = r->skip[PF_SKIP_DST_ADDR].ptr;
3044 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
3045 r->dst.port[0], r->dst.port[1], th->th_dport))
3046 r = r->skip[PF_SKIP_DST_PORT].ptr;
3047 else if (r->tos && !(r->tos == pd->tos))
3048 r = TAILQ_NEXT(r, entries);
3049 else if (r->rule_flag & PFRULE_FRAGMENT)
3050 r = TAILQ_NEXT(r, entries);
3051 else if ((r->flagset & th->th_flags) != r->flags)
3052 r = TAILQ_NEXT(r, entries);
3053 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done =
3054 pf_socket_lookup(direction, pd, inp), 1)) &&
3055 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
3057 r = TAILQ_NEXT(r, entries);
3058 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done =
3059 pf_socket_lookup(direction, pd, inp), 1)) &&
3060 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
3062 r = TAILQ_NEXT(r, entries);
3063 else if (r->prob && r->prob <= karc4random())
3064 r = TAILQ_NEXT(r, entries);
3065 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag))
3066 r = TAILQ_NEXT(r, entries);
3067 else if (r->os_fingerprint != PF_OSFP_ANY && !pf_osfp_match(
3068 pf_osfp_fingerprint(pd, m, off, th), r->os_fingerprint))
3069 r = TAILQ_NEXT(r, entries);
3073 if (r->rtableid >= 0)
3074 rtableid = r->rtableid;
3075 if (r->anchor == NULL) {
3082 r = TAILQ_NEXT(r, entries);
3084 pf_step_into_anchor(&asd, &ruleset,
3085 PF_RULESET_FILTER, &r, &a, &match);
3087 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
3088 PF_RULESET_FILTER, &r, &a, &match))
3095 REASON_SET(&reason, PFRES_MATCH);
3097 if (r->log || (nr != NULL && nr->natpass && nr->log)) {
3099 m_copyback(m, off, sizeof(*th), (caddr_t)th);
3100 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr,
3104 if ((r->action == PF_DROP) &&
3105 ((r->rule_flag & PFRULE_RETURNRST) ||
3106 (r->rule_flag & PFRULE_RETURNICMP) ||
3107 (r->rule_flag & PFRULE_RETURN))) {
3108 /* undo NAT changes, if they have taken place */
3110 if (direction == PF_OUT) {
3111 pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
3112 &th->th_sum, &pd->baddr, bport, 0, af);
3115 pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
3116 &th->th_sum, &pd->baddr, bport, 0, af);
3120 if (((r->rule_flag & PFRULE_RETURNRST) ||
3121 (r->rule_flag & PFRULE_RETURN)) &&
3122 !(th->th_flags & TH_RST)) {
3123 u_int32_t ack = ntohl(th->th_seq) + pd->p_len;
3125 if (th->th_flags & TH_SYN)
3127 if (th->th_flags & TH_FIN)
3129 pf_send_tcp(r, af, pd->dst,
3130 pd->src, th->th_dport, th->th_sport,
3131 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
3132 r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp);
3133 } else if ((af == AF_INET) && r->return_icmp)
3134 pf_send_icmp(m, r->return_icmp >> 8,
3135 r->return_icmp & 255, af, r);
3136 else if ((af == AF_INET6) && r->return_icmp6)
3137 pf_send_icmp(m, r->return_icmp6 >> 8,
3138 r->return_icmp6 & 255, af, r);
3141 if (r->action == PF_DROP) {
3145 if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) {
3146 REASON_SET(&reason, PFRES_MEMORY);
3150 if (r->keep_state || nr != NULL ||
3151 (pd->flags & PFDESC_TCP_NORM)) {
3152 /* create new state */
3154 struct pf_state *s = NULL;
3155 struct pf_src_node *sn = NULL;
3157 len = pd->tot_len - off - (th->th_off << 2);
3159 /* check maximums */
3160 if (r->max_states && (r->states >= r->max_states)) {
3161 pf_status.lcounters[LCNT_STATES]++;
3162 REASON_SET(&reason, PFRES_MAXSTATES);
3165 /* src node for filter rule */
3166 if ((r->rule_flag & PFRULE_SRCTRACK ||
3167 r->rpool.opts & PF_POOL_STICKYADDR) &&
3168 pf_insert_src_node(&sn, r, saddr, af) != 0) {
3169 REASON_SET(&reason, PFRES_SRCLIMIT);
3172 /* src node for translation rule */
3173 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3174 ((direction == PF_OUT &&
3175 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
3176 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) {
3177 REASON_SET(&reason, PFRES_SRCLIMIT);
3180 s = pool_get(&pf_state_pl, PR_NOWAIT);
3182 REASON_SET(&reason, PFRES_MEMORY);
3184 if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3185 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3186 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3187 pf_status.src_nodes--;
3188 pool_put(&pf_src_tree_pl, sn);
3190 if (nsn != sn && nsn != NULL && nsn->states == 0 &&
3192 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3193 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3194 pf_status.src_nodes--;
3195 pool_put(&pf_src_tree_pl, nsn);
3199 bzero(s, sizeof(*s));
3201 s->nat_rule.ptr = nr;
3203 STATE_INC_COUNTERS(s);
3204 s->allow_opts = r->allow_opts;
3205 s->log = r->log & PF_LOG_ALL;
3207 s->log |= nr->log & PF_LOG_ALL;
3208 s->proto = IPPROTO_TCP;
3209 s->direction = direction;
3211 if (direction == PF_OUT) {
3212 PF_ACPY(&s->gwy.addr, saddr, af);
3213 s->gwy.port = th->th_sport; /* sport */
3214 PF_ACPY(&s->ext.addr, daddr, af);
3215 s->ext.port = th->th_dport;
3217 PF_ACPY(&s->lan.addr, &pd->baddr, af);
3218 s->lan.port = bport;
3220 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
3221 s->lan.port = s->gwy.port;
3224 PF_ACPY(&s->lan.addr, daddr, af);
3225 s->lan.port = th->th_dport;
3226 PF_ACPY(&s->ext.addr, saddr, af);
3227 s->ext.port = th->th_sport;
3229 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
3230 s->gwy.port = bport;
3232 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
3233 s->gwy.port = s->lan.port;
3237 s->hash = pf_state_hash(s);
3238 s->src.seqlo = ntohl(th->th_seq);
3239 s->src.seqhi = s->src.seqlo + len + 1;
3240 s->pickup_mode = r->pickup_mode;
3242 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
3243 r->keep_state == PF_STATE_MODULATE) {
3244 /* Generate sequence number modulator */
3245 while ((s->src.seqdiff =
3246 pf_new_isn(s) - s->src.seqlo) == 0)
3248 pf_change_a(&th->th_seq, &th->th_sum,
3249 htonl(s->src.seqlo + s->src.seqdiff), 0);
3253 if (th->th_flags & TH_SYN) {
3255 s->src.wscale = pf_get_wscale(m, off, th->th_off, af);
3256 s->sync_flags |= PFSTATE_GOT_SYN1;
3258 s->src.max_win = MAX(ntohs(th->th_win), 1);
3259 if (s->src.wscale & PF_WSCALE_MASK) {
3260 /* Remove scale factor from initial window */
3261 u_int win = s->src.max_win;
3262 win += 1 << (s->src.wscale & PF_WSCALE_MASK);
3263 s->src.max_win = (win - 1) >>
3264 (s->src.wscale & PF_WSCALE_MASK);
3266 if (th->th_flags & TH_FIN)
3270 s->src.state = TCPS_SYN_SENT;
3271 s->dst.state = TCPS_CLOSED;
3272 s->creation = time_second;
3273 s->expire = time_second;
3274 s->timeout = PFTM_TCP_FIRST_PACKET;
3275 pf_set_rt_ifp(s, saddr);
3278 s->src_node->states++;
3281 PF_ACPY(&nsn->raddr, &pd->naddr, af);
3282 s->nat_src_node = nsn;
3283 s->nat_src_node->states++;
3285 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
3286 off, pd, th, &s->src, &s->dst)) {
3287 REASON_SET(&reason, PFRES_MEMORY);
3288 pf_src_tree_remove_state(s);
3289 STATE_DEC_COUNTERS(s);
3290 pool_put(&pf_state_pl, s);
3293 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
3294 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s,
3295 &s->src, &s->dst, &rewrite)) {
3296 /* This really shouldn't happen!!! */
3297 DPFPRINTF(PF_DEBUG_URGENT,
3298 ("pf_normalize_tcp_stateful failed on first pkt"));
3299 pf_normalize_tcp_cleanup(s);
3300 pf_src_tree_remove_state(s);
3301 STATE_DEC_COUNTERS(s);
3302 pool_put(&pf_state_pl, s);
3305 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
3306 pf_normalize_tcp_cleanup(s);
3307 REASON_SET(&reason, PFRES_STATEINS);
3308 pf_src_tree_remove_state(s);
3309 STATE_DEC_COUNTERS(s);
3310 pool_put(&pf_state_pl, s);
3318 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
3319 r->keep_state == PF_STATE_SYNPROXY) {
3320 s->src.state = PF_TCPS_PROXY_SRC;
3322 if (direction == PF_OUT) {
3323 pf_change_ap(saddr, &th->th_sport,
3324 pd->ip_sum, &th->th_sum, &pd->baddr,
3327 pf_change_ap(daddr, &th->th_dport,
3328 pd->ip_sum, &th->th_sum, &pd->baddr,
3332 s->src.seqhi = htonl(karc4random());
3333 /* Find mss option */
3334 mss = pf_get_mss(m, off, th->th_off, af);
3335 mss = pf_calc_mss(saddr, af, mss);
3336 mss = pf_calc_mss(daddr, af, mss);
3338 pf_send_tcp(r, af, daddr, saddr, th->th_dport,
3339 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
3340 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL);
3341 REASON_SET(&reason, PFRES_SYNPROXY);
3342 return (PF_SYNPROXY_DROP);
3346 /* copy back packet headers if we performed NAT operations */
3348 m_copyback(m, off, sizeof(*th), (caddr_t)th);
3354 pf_test_udp(struct pf_rule **rm, struct pf_state **sm, int direction,
3355 struct pfi_kif *kif, struct mbuf *m, int off, void *h,
3356 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm,
3357 struct ifqueue *ifq, struct inpcb *inp)
3359 struct pf_rule *nr = NULL;
3360 struct pf_addr *saddr = pd->src, *daddr = pd->dst;
3361 struct udphdr *uh = pd->hdr.udp;
3362 u_int16_t bport, nport = 0;
3363 sa_family_t af = pd->af;
3364 struct pf_rule *r, *a = NULL;
3365 struct pf_ruleset *ruleset = NULL;
3366 struct pf_src_node *nsn = NULL;
3369 int tag = -1, rtableid = -1;
3373 if (pf_check_congestion(ifq)) {
3374 REASON_SET(&reason, PFRES_CONGEST);
3378 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3380 if (direction == PF_OUT) {
3381 bport = nport = uh->uh_sport;
3382 /* check outgoing packet for BINAT/NAT */
3383 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
3384 saddr, uh->uh_sport, daddr, uh->uh_dport,
3385 &pd->naddr, &nport)) != NULL) {
3386 PF_ACPY(&pd->baddr, saddr, af);
3387 pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum,
3388 &uh->uh_sum, &pd->naddr, nport, 1, af);
3395 bport = nport = uh->uh_dport;
3396 /* check incoming packet for BINAT/RDR */
3397 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
3398 saddr, uh->uh_sport, daddr, uh->uh_dport, &pd->naddr,
3400 PF_ACPY(&pd->baddr, daddr, af);
3401 pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum,
3402 &uh->uh_sum, &pd->naddr, nport, 1, af);
3412 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3413 r = r->skip[PF_SKIP_IFP].ptr;
3414 else if (r->direction && r->direction != direction)
3415 r = r->skip[PF_SKIP_DIR].ptr;
3416 else if (r->af && r->af != af)
3417 r = r->skip[PF_SKIP_AF].ptr;
3418 else if (r->proto && r->proto != IPPROTO_UDP)
3419 r = r->skip[PF_SKIP_PROTO].ptr;
3420 else if (PF_MISMATCHAW(&r->src.addr, saddr, af,
3422 r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3423 else if (r->src.port_op && !pf_match_port(r->src.port_op,
3424 r->src.port[0], r->src.port[1], uh->uh_sport))
3425 r = r->skip[PF_SKIP_SRC_PORT].ptr;
3426 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af,
3428 r = r->skip[PF_SKIP_DST_ADDR].ptr;
3429 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
3430 r->dst.port[0], r->dst.port[1], uh->uh_dport))
3431 r = r->skip[PF_SKIP_DST_PORT].ptr;
3432 else if (r->tos && !(r->tos == pd->tos))
3433 r = TAILQ_NEXT(r, entries);
3434 else if (r->rule_flag & PFRULE_FRAGMENT)
3435 r = TAILQ_NEXT(r, entries);
3436 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done =
3437 pf_socket_lookup(direction, pd, inp), 1)) &&
3438 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
3440 r = TAILQ_NEXT(r, entries);
3441 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done =
3442 pf_socket_lookup(direction, pd, inp), 1)) &&
3443 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
3445 r = TAILQ_NEXT(r, entries);
3446 else if (r->prob && r->prob <= karc4random())
3447 r = TAILQ_NEXT(r, entries);
3448 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag))
3449 r = TAILQ_NEXT(r, entries);
3450 else if (r->os_fingerprint != PF_OSFP_ANY)
3451 r = TAILQ_NEXT(r, entries);
3455 if (r->rtableid >= 0)
3456 rtableid = r->rtableid;
3457 if (r->anchor == NULL) {
3464 r = TAILQ_NEXT(r, entries);
3466 pf_step_into_anchor(&asd, &ruleset,
3467 PF_RULESET_FILTER, &r, &a, &match);
3469 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
3470 PF_RULESET_FILTER, &r, &a, &match))
3477 REASON_SET(&reason, PFRES_MATCH);
3479 if (r->log || (nr != NULL && nr->natpass && nr->log)) {
3481 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
3482 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr,
3486 if ((r->action == PF_DROP) &&
3487 ((r->rule_flag & PFRULE_RETURNICMP) ||
3488 (r->rule_flag & PFRULE_RETURN))) {
3489 /* undo NAT changes, if they have taken place */
3491 if (direction == PF_OUT) {
3492 pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum,
3493 &uh->uh_sum, &pd->baddr, bport, 1, af);
3496 pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum,
3497 &uh->uh_sum, &pd->baddr, bport, 1, af);
3501 if ((af == AF_INET) && r->return_icmp)
3502 pf_send_icmp(m, r->return_icmp >> 8,
3503 r->return_icmp & 255, af, r);
3504 else if ((af == AF_INET6) && r->return_icmp6)
3505 pf_send_icmp(m, r->return_icmp6 >> 8,
3506 r->return_icmp6 & 255, af, r);
3509 if (r->action == PF_DROP)
3512 if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) {
3513 REASON_SET(&reason, PFRES_MEMORY);
3517 if (r->keep_state || nr != NULL) {
3518 /* create new state */
3519 struct pf_state *s = NULL;
3520 struct pf_src_node *sn = NULL;
3522 /* check maximums */
3523 if (r->max_states && (r->states >= r->max_states)) {
3524 pf_status.lcounters[LCNT_STATES]++;
3525 REASON_SET(&reason, PFRES_MAXSTATES);
3528 /* src node for filter rule */
3529 if ((r->rule_flag & PFRULE_SRCTRACK ||
3530 r->rpool.opts & PF_POOL_STICKYADDR) &&
3531 pf_insert_src_node(&sn, r, saddr, af) != 0) {
3532 REASON_SET(&reason, PFRES_SRCLIMIT);
3535 /* src node for translation rule */
3536 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3537 ((direction == PF_OUT &&
3538 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
3539 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) {
3540 REASON_SET(&reason, PFRES_SRCLIMIT);
3543 s = pool_get(&pf_state_pl, PR_NOWAIT);
3545 REASON_SET(&reason, PFRES_MEMORY);
3547 if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3548 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3549 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3550 pf_status.src_nodes--;
3551 pool_put(&pf_src_tree_pl, sn);
3553 if (nsn != sn && nsn != NULL && nsn->states == 0 &&
3555 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3556 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3557 pf_status.src_nodes--;
3558 pool_put(&pf_src_tree_pl, nsn);
3562 bzero(s, sizeof(*s));
3564 s->nat_rule.ptr = nr;
3566 STATE_INC_COUNTERS(s);
3567 s->allow_opts = r->allow_opts;
3568 s->log = r->log & PF_LOG_ALL;
3570 s->log |= nr->log & PF_LOG_ALL;
3571 s->proto = IPPROTO_UDP;
3572 s->direction = direction;
3574 if (direction == PF_OUT) {
3575 PF_ACPY(&s->gwy.addr, saddr, af);
3576 s->gwy.port = uh->uh_sport;
3577 PF_ACPY(&s->ext.addr, daddr, af);
3578 s->ext.port = uh->uh_dport;
3580 PF_ACPY(&s->lan.addr, &pd->baddr, af);
3581 s->lan.port = bport;
3583 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
3584 s->lan.port = s->gwy.port;
3587 PF_ACPY(&s->lan.addr, daddr, af);
3588 s->lan.port = uh->uh_dport;
3589 PF_ACPY(&s->ext.addr, saddr, af);
3590 s->ext.port = uh->uh_sport;
3592 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
3593 s->gwy.port = bport;
3595 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
3596 s->gwy.port = s->lan.port;
3599 s->hash = pf_state_hash(s);
3600 s->src.state = PFUDPS_SINGLE;
3601 s->dst.state = PFUDPS_NO_TRAFFIC;
3602 s->creation = time_second;
3603 s->expire = time_second;
3604 s->timeout = PFTM_UDP_FIRST_PACKET;
3605 pf_set_rt_ifp(s, saddr);
3608 s->src_node->states++;
3611 PF_ACPY(&nsn->raddr, &pd->naddr, af);
3612 s->nat_src_node = nsn;
3613 s->nat_src_node->states++;
3615 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
3616 REASON_SET(&reason, PFRES_STATEINS);
3617 pf_src_tree_remove_state(s);
3618 STATE_DEC_COUNTERS(s);
3619 pool_put(&pf_state_pl, s);
3629 /* copy back packet headers if we performed NAT operations */
3631 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
3637 pf_test_icmp(struct pf_rule **rm, struct pf_state **sm, int direction,
3638 struct pfi_kif *kif, struct mbuf *m, int off, void *h,
3639 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm,
3640 struct ifqueue *ifq)
3642 struct pf_rule *nr = NULL;
3643 struct pf_addr *saddr = pd->src, *daddr = pd->dst;
3644 struct pf_rule *r, *a = NULL;
3645 struct pf_ruleset *ruleset = NULL;
3646 struct pf_src_node *nsn = NULL;
3648 u_int16_t icmpid = 0, bport, nport = 0;
3649 sa_family_t af = pd->af;
3650 u_int8_t icmptype = 0, icmpcode = 0;
3652 int tag = -1, rtableid = -1;
3659 if (pf_check_congestion(ifq)) {
3660 REASON_SET(&reason, PFRES_CONGEST);
3664 switch (pd->proto) {
3667 icmptype = pd->hdr.icmp->icmp_type;
3668 icmpcode = pd->hdr.icmp->icmp_code;
3669 icmpid = pd->hdr.icmp->icmp_id;
3671 if (icmptype == ICMP_UNREACH ||
3672 icmptype == ICMP_SOURCEQUENCH ||
3673 icmptype == ICMP_REDIRECT ||
3674 icmptype == ICMP_TIMXCEED ||
3675 icmptype == ICMP_PARAMPROB)
3680 case IPPROTO_ICMPV6:
3681 icmptype = pd->hdr.icmp6->icmp6_type;
3682 icmpcode = pd->hdr.icmp6->icmp6_code;
3683 icmpid = pd->hdr.icmp6->icmp6_id;
3685 if (icmptype == ICMP6_DST_UNREACH ||
3686 icmptype == ICMP6_PACKET_TOO_BIG ||
3687 icmptype == ICMP6_TIME_EXCEEDED ||
3688 icmptype == ICMP6_PARAM_PROB)
3694 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3696 if (direction == PF_OUT) {
3697 bport = nport = icmpid;
3698 /* check outgoing packet for BINAT/NAT */
3699 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
3700 saddr, icmpid, daddr, icmpid, &pd->naddr, &nport)) !=
3702 PF_ACPY(&pd->baddr, saddr, af);
3706 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3707 pd->naddr.v4.s_addr, 0);
3708 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup(
3709 pd->hdr.icmp->icmp_cksum, icmpid, nport, 0);
3710 pd->hdr.icmp->icmp_id = nport;
3711 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
3716 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
3727 bport = nport = icmpid;
3728 /* check incoming packet for BINAT/RDR */
3729 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
3730 saddr, icmpid, daddr, icmpid, &pd->naddr, &nport)) !=
3732 PF_ACPY(&pd->baddr, daddr, af);
3736 pf_change_a(&daddr->v4.s_addr,
3737 pd->ip_sum, pd->naddr.v4.s_addr, 0);
3742 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
3756 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3757 r = r->skip[PF_SKIP_IFP].ptr;
3758 else if (r->direction && r->direction != direction)
3759 r = r->skip[PF_SKIP_DIR].ptr;
3760 else if (r->af && r->af != af)
3761 r = r->skip[PF_SKIP_AF].ptr;
3762 else if (r->proto && r->proto != pd->proto)
3763 r = r->skip[PF_SKIP_PROTO].ptr;
3764 else if (PF_MISMATCHAW(&r->src.addr, saddr, af,
3766 r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3767 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af,
3769 r = r->skip[PF_SKIP_DST_ADDR].ptr;
3770 else if (r->type && r->type != icmptype + 1)
3771 r = TAILQ_NEXT(r, entries);
3772 else if (r->code && r->code != icmpcode + 1)
3773 r = TAILQ_NEXT(r, entries);
3774 else if (r->tos && !(r->tos == pd->tos))
3775 r = TAILQ_NEXT(r, entries);
3776 else if (r->rule_flag & PFRULE_FRAGMENT)
3777 r = TAILQ_NEXT(r, entries);
3778 else if (r->prob && r->prob <= karc4random())
3779 r = TAILQ_NEXT(r, entries);
3780 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag))
3781 r = TAILQ_NEXT(r, entries);
3782 else if (r->os_fingerprint != PF_OSFP_ANY)
3783 r = TAILQ_NEXT(r, entries);
3787 if (r->rtableid >= 0)
3788 rtableid = r->rtableid;
3789 if (r->anchor == NULL) {
3796 r = TAILQ_NEXT(r, entries);
3798 pf_step_into_anchor(&asd, &ruleset,
3799 PF_RULESET_FILTER, &r, &a, &match);
3801 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
3802 PF_RULESET_FILTER, &r, &a, &match))
3809 REASON_SET(&reason, PFRES_MATCH);
3811 if (r->log || (nr != NULL && nr->natpass && nr->log)) {
3814 m_copyback(m, off, sizeof(struct icmp6_hdr),
3815 (caddr_t)pd->hdr.icmp6);
3817 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr,
3821 if (r->action != PF_PASS)
3824 if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) {
3825 REASON_SET(&reason, PFRES_MEMORY);
3829 if (!state_icmp && (r->keep_state || nr != NULL)) {
3830 /* create new state */
3831 struct pf_state *s = NULL;
3832 struct pf_src_node *sn = NULL;
3834 /* check maximums */
3835 if (r->max_states && (r->states >= r->max_states)) {
3836 pf_status.lcounters[LCNT_STATES]++;
3837 REASON_SET(&reason, PFRES_MAXSTATES);
3840 /* src node for filter rule */
3841 if ((r->rule_flag & PFRULE_SRCTRACK ||
3842 r->rpool.opts & PF_POOL_STICKYADDR) &&
3843 pf_insert_src_node(&sn, r, saddr, af) != 0) {
3844 REASON_SET(&reason, PFRES_SRCLIMIT);
3847 /* src node for translation rule */
3848 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3849 ((direction == PF_OUT &&
3850 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
3851 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) {
3852 REASON_SET(&reason, PFRES_SRCLIMIT);
3855 s = pool_get(&pf_state_pl, PR_NOWAIT);
3857 REASON_SET(&reason, PFRES_MEMORY);
3859 if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3860 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3861 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3862 pf_status.src_nodes--;
3863 pool_put(&pf_src_tree_pl, sn);
3865 if (nsn != sn && nsn != NULL && nsn->states == 0 &&
3867 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3868 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3869 pf_status.src_nodes--;
3870 pool_put(&pf_src_tree_pl, nsn);
3874 bzero(s, sizeof(*s));
3876 s->nat_rule.ptr = nr;
3878 STATE_INC_COUNTERS(s);
3879 s->allow_opts = r->allow_opts;
3880 s->log = r->log & PF_LOG_ALL;
3882 s->log |= nr->log & PF_LOG_ALL;
3883 s->proto = pd->proto;
3884 s->direction = direction;
3886 if (direction == PF_OUT) {
3887 PF_ACPY(&s->gwy.addr, saddr, af);
3888 s->gwy.port = nport;
3889 PF_ACPY(&s->ext.addr, daddr, af);
3892 PF_ACPY(&s->lan.addr, &pd->baddr, af);
3893 s->lan.port = bport;
3895 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
3896 s->lan.port = s->gwy.port;
3899 PF_ACPY(&s->lan.addr, daddr, af);
3900 s->lan.port = nport;
3901 PF_ACPY(&s->ext.addr, saddr, af);
3904 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
3905 s->gwy.port = bport;
3907 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
3908 s->gwy.port = s->lan.port;
3911 s->hash = pf_state_hash(s);
3912 s->creation = time_second;
3913 s->expire = time_second;
3914 s->timeout = PFTM_ICMP_FIRST_PACKET;
3915 pf_set_rt_ifp(s, saddr);
3918 s->src_node->states++;
3921 PF_ACPY(&nsn->raddr, &pd->naddr, af);
3922 s->nat_src_node = nsn;
3923 s->nat_src_node->states++;
3925 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
3926 REASON_SET(&reason, PFRES_STATEINS);
3927 pf_src_tree_remove_state(s);
3928 STATE_DEC_COUNTERS(s);
3929 pool_put(&pf_state_pl, s);
3940 /* copy back packet headers if we performed IPv6 NAT operations */
3942 m_copyback(m, off, sizeof(struct icmp6_hdr),
3943 (caddr_t)pd->hdr.icmp6);
3950 pf_test_other(struct pf_rule **rm, struct pf_state **sm, int direction,
3951 struct pfi_kif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
3952 struct pf_rule **am, struct pf_ruleset **rsm, struct ifqueue *ifq)
3954 struct pf_rule *nr = NULL;
3955 struct pf_rule *r, *a = NULL;
3956 struct pf_ruleset *ruleset = NULL;
3957 struct pf_src_node *nsn = NULL;
3958 struct pf_addr *saddr = pd->src, *daddr = pd->dst;
3959 sa_family_t af = pd->af;
3961 int tag = -1, rtableid = -1;
3965 if (pf_check_congestion(ifq)) {
3966 REASON_SET(&reason, PFRES_CONGEST);
3970 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3972 if (direction == PF_OUT) {
3973 /* check outgoing packet for BINAT/NAT */
3974 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
3975 saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3976 PF_ACPY(&pd->baddr, saddr, af);
3980 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3981 pd->naddr.v4.s_addr, 0);
3986 PF_ACPY(saddr, &pd->naddr, af);
3995 /* check incoming packet for BINAT/RDR */
3996 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
3997 saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3998 PF_ACPY(&pd->baddr, daddr, af);
4002 pf_change_a(&daddr->v4.s_addr,
4003 pd->ip_sum, pd->naddr.v4.s_addr, 0);
4008 PF_ACPY(daddr, &pd->naddr, af);
4020 if (pfi_kif_match(r->kif, kif) == r->ifnot)
4021 r = r->skip[PF_SKIP_IFP].ptr;
4022 else if (r->direction && r->direction != direction)
4023 r = r->skip[PF_SKIP_DIR].ptr;
4024 else if (r->af && r->af != af)
4025 r = r->skip[PF_SKIP_AF].ptr;
4026 else if (r->proto && r->proto != pd->proto)
4027 r = r->skip[PF_SKIP_PROTO].ptr;
4028 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af,
4030 r = r->skip[PF_SKIP_SRC_ADDR].ptr;
4031 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af,
4033 r = r->skip[PF_SKIP_DST_ADDR].ptr;
4034 else if (r->tos && !(r->tos == pd->tos))
4035 r = TAILQ_NEXT(r, entries);
4036 else if (r->rule_flag & PFRULE_FRAGMENT)
4037 r = TAILQ_NEXT(r, entries);
4038 else if (r->prob && r->prob <= karc4random())
4039 r = TAILQ_NEXT(r, entries);
4040 else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag))
4041 r = TAILQ_NEXT(r, entries);
4042 else if (r->os_fingerprint != PF_OSFP_ANY)
4043 r = TAILQ_NEXT(r, entries);
4047 if (r->rtableid >= 0)
4048 rtableid = r->rtableid;
4049 if (r->anchor == NULL) {
4056 r = TAILQ_NEXT(r, entries);
4058 pf_step_into_anchor(&asd, &ruleset,
4059 PF_RULESET_FILTER, &r, &a, &match);
4061 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
4062 PF_RULESET_FILTER, &r, &a, &match))
4069 REASON_SET(&reason, PFRES_MATCH);
4071 if (r->log || (nr != NULL && nr->natpass && nr->log))
4072 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr,
4075 if ((r->action == PF_DROP) &&
4076 ((r->rule_flag & PFRULE_RETURNICMP) ||
4077 (r->rule_flag & PFRULE_RETURN))) {
4078 struct pf_addr *a = NULL;
4081 if (direction == PF_OUT)
4090 pf_change_a(&a->v4.s_addr, pd->ip_sum,
4091 pd->baddr.v4.s_addr, 0);
4096 PF_ACPY(a, &pd->baddr, af);
4101 if ((af == AF_INET) && r->return_icmp)
4102 pf_send_icmp(m, r->return_icmp >> 8,
4103 r->return_icmp & 255, af, r);
4104 else if ((af == AF_INET6) && r->return_icmp6)
4105 pf_send_icmp(m, r->return_icmp6 >> 8,
4106 r->return_icmp6 & 255, af, r);
4109 if (r->action != PF_PASS)
4112 if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) {
4113 REASON_SET(&reason, PFRES_MEMORY);
4117 if (r->keep_state || nr != NULL) {
4118 /* create new state */
4119 struct pf_state *s = NULL;
4120 struct pf_src_node *sn = NULL;
4122 /* check maximums */
4123 if (r->max_states && (r->states >= r->max_states)) {
4124 pf_status.lcounters[LCNT_STATES]++;
4125 REASON_SET(&reason, PFRES_MAXSTATES);
4128 /* src node for filter rule */
4129 if ((r->rule_flag & PFRULE_SRCTRACK ||
4130 r->rpool.opts & PF_POOL_STICKYADDR) &&
4131 pf_insert_src_node(&sn, r, saddr, af) != 0) {
4132 REASON_SET(&reason, PFRES_SRCLIMIT);
4135 /* src node for translation rule */
4136 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
4137 ((direction == PF_OUT &&
4138 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
4139 (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) {
4140 REASON_SET(&reason, PFRES_SRCLIMIT);
4143 s = pool_get(&pf_state_pl, PR_NOWAIT);
4145 REASON_SET(&reason, PFRES_MEMORY);
4147 if (sn != NULL && sn->states == 0 && sn->expire == 0) {
4148 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
4149 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
4150 pf_status.src_nodes--;
4151 pool_put(&pf_src_tree_pl, sn);
4153 if (nsn != sn && nsn != NULL && nsn->states == 0 &&
4155 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
4156 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
4157 pf_status.src_nodes--;
4158 pool_put(&pf_src_tree_pl, nsn);
4162 bzero(s, sizeof(*s));
4164 s->nat_rule.ptr = nr;
4166 STATE_INC_COUNTERS(s);
4167 s->allow_opts = r->allow_opts;
4168 s->log = r->log & PF_LOG_ALL;
4170 s->log |= nr->log & PF_LOG_ALL;
4171 s->proto = pd->proto;
4172 s->direction = direction;
4174 if (direction == PF_OUT) {
4175 PF_ACPY(&s->gwy.addr, saddr, af);
4176 PF_ACPY(&s->ext.addr, daddr, af);
4178 PF_ACPY(&s->lan.addr, &pd->baddr, af);
4180 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
4182 PF_ACPY(&s->lan.addr, daddr, af);
4183 PF_ACPY(&s->ext.addr, saddr, af);
4185 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
4187 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
4189 s->hash = pf_state_hash(s);
4190 s->src.state = PFOTHERS_SINGLE;
4191 s->dst.state = PFOTHERS_NO_TRAFFIC;
4192 s->creation = time_second;
4193 s->expire = time_second;
4194 s->timeout = PFTM_OTHER_FIRST_PACKET;
4195 pf_set_rt_ifp(s, saddr);
4198 s->src_node->states++;
4201 PF_ACPY(&nsn->raddr, &pd->naddr, af);
4202 s->nat_src_node = nsn;
4203 s->nat_src_node->states++;
4205 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
4206 REASON_SET(&reason, PFRES_STATEINS);
4207 pf_src_tree_remove_state(s);
4208 STATE_DEC_COUNTERS(s);
4209 pool_put(&pf_state_pl, s);
4223 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
4224 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
4225 struct pf_ruleset **rsm)
4227 struct pf_rule *r, *a = NULL;
4228 struct pf_ruleset *ruleset = NULL;
4229 sa_family_t af = pd->af;
4235 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
4238 if (pfi_kif_match(r->kif, kif) == r->ifnot)
4239 r = r->skip[PF_SKIP_IFP].ptr;
4240 else if (r->direction && r->direction != direction)
4241 r = r->skip[PF_SKIP_DIR].ptr;
4242 else if (r->af && r->af != af)
4243 r = r->skip[PF_SKIP_AF].ptr;
4244 else if (r->proto && r->proto != pd->proto)
4245 r = r->skip[PF_SKIP_PROTO].ptr;
4246 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af,
4248 r = r->skip[PF_SKIP_SRC_ADDR].ptr;
4249 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af,
4251 r = r->skip[PF_SKIP_DST_ADDR].ptr;
4252 else if (r->tos && !(r->tos == pd->tos))
4253 r = TAILQ_NEXT(r, entries);
4254 else if (r->os_fingerprint != PF_OSFP_ANY)
4255 r = TAILQ_NEXT(r, entries);
4256 else if (pd->proto == IPPROTO_UDP &&
4257 (r->src.port_op || r->dst.port_op))
4258 r = TAILQ_NEXT(r, entries);
4259 else if (pd->proto == IPPROTO_TCP &&
4260 (r->src.port_op || r->dst.port_op || r->flagset))
4261 r = TAILQ_NEXT(r, entries);
4262 else if ((pd->proto == IPPROTO_ICMP ||
4263 pd->proto == IPPROTO_ICMPV6) &&
4264 (r->type || r->code))
4265 r = TAILQ_NEXT(r, entries);
4266 else if (r->prob && r->prob <= karc4random())
4267 r = TAILQ_NEXT(r, entries);
4268 else if (r->match_tag && !pf_match_tag(m, r, NULL, &tag))
4269 r = TAILQ_NEXT(r, entries);
4271 if (r->anchor == NULL) {
4278 r = TAILQ_NEXT(r, entries);
4280 pf_step_into_anchor(&asd, &ruleset,
4281 PF_RULESET_FILTER, &r, &a, &match);
4283 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
4284 PF_RULESET_FILTER, &r, &a, &match))
4291 REASON_SET(&reason, PFRES_MATCH);
4294 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset,
4297 if (r->action != PF_PASS)
4300 if (pf_tag_packet(m, pd->pf_mtag, tag, -1)) {
4301 REASON_SET(&reason, PFRES_MEMORY);
4309 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
4310 struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
4313 struct pf_state_cmp key;
4314 struct tcphdr *th = pd->hdr.tcp;
4315 u_int16_t win = ntohs(th->th_win);
4316 u_int32_t ack, end, seq, orig_seq;
4320 struct pf_state_peer *src, *dst;
4323 key.proto = IPPROTO_TCP;
4324 if (direction == PF_IN) {
4325 PF_ACPY(&key.ext.addr, pd->src, key.af);
4326 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
4327 key.ext.port = th->th_sport;
4328 key.gwy.port = th->th_dport;
4330 PF_ACPY(&key.lan.addr, pd->src, key.af);
4331 PF_ACPY(&key.ext.addr, pd->dst, key.af);
4332 key.lan.port = th->th_sport;
4333 key.ext.port = th->th_dport;
4338 if (direction == (*state)->direction) {
4339 src = &(*state)->src;
4340 dst = &(*state)->dst;
4342 src = &(*state)->dst;
4343 dst = &(*state)->src;
4346 if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
4347 if (direction != (*state)->direction) {
4348 REASON_SET(reason, PFRES_SYNPROXY);
4349 return (PF_SYNPROXY_DROP);
4351 if (th->th_flags & TH_SYN) {
4352 if (ntohl(th->th_seq) != (*state)->src.seqlo) {
4353 REASON_SET(reason, PFRES_SYNPROXY);
4356 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
4357 pd->src, th->th_dport, th->th_sport,
4358 (*state)->src.seqhi, ntohl(th->th_seq) + 1,
4359 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1,
4361 REASON_SET(reason, PFRES_SYNPROXY);
4362 return (PF_SYNPROXY_DROP);
4363 } else if (!(th->th_flags & TH_ACK) ||
4364 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4365 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4366 REASON_SET(reason, PFRES_SYNPROXY);
4368 } else if ((*state)->src_node != NULL &&
4369 pf_src_connlimit(state)) {
4370 REASON_SET(reason, PFRES_SRCLIMIT);
4373 (*state)->src.state = PF_TCPS_PROXY_DST;
4375 if ((*state)->src.state == PF_TCPS_PROXY_DST) {
4376 struct pf_state_host *src, *dst;
4378 if (direction == PF_OUT) {
4379 src = &(*state)->gwy;
4380 dst = &(*state)->ext;
4382 src = &(*state)->ext;
4383 dst = &(*state)->lan;
4385 if (direction == (*state)->direction) {
4386 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
4387 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4388 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4389 REASON_SET(reason, PFRES_SYNPROXY);
4392 (*state)->src.max_win = MAX(ntohs(th->th_win), 1);
4393 if ((*state)->dst.seqhi == 1)
4394 (*state)->dst.seqhi = htonl(karc4random());
4395 pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr,
4396 &dst->addr, src->port, dst->port,
4397 (*state)->dst.seqhi, 0, TH_SYN, 0,
4398 (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL);
4399 REASON_SET(reason, PFRES_SYNPROXY);
4400 return (PF_SYNPROXY_DROP);
4401 } else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
4403 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) {
4404 REASON_SET(reason, PFRES_SYNPROXY);
4407 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
4408 (*state)->dst.seqlo = ntohl(th->th_seq);
4409 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
4410 pd->src, th->th_dport, th->th_sport,
4411 ntohl(th->th_ack), ntohl(th->th_seq) + 1,
4412 TH_ACK, (*state)->src.max_win, 0, 0, 0,
4413 (*state)->tag, NULL, NULL);
4414 pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr,
4415 &dst->addr, src->port, dst->port,
4416 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
4417 TH_ACK, (*state)->dst.max_win, 0, 0, 1,
4419 (*state)->src.seqdiff = (*state)->dst.seqhi -
4420 (*state)->src.seqlo;
4421 (*state)->dst.seqdiff = (*state)->src.seqhi -
4422 (*state)->dst.seqlo;
4423 (*state)->src.seqhi = (*state)->src.seqlo +
4424 (*state)->dst.max_win;
4425 (*state)->dst.seqhi = (*state)->dst.seqlo +
4426 (*state)->src.max_win;
4427 (*state)->src.wscale = (*state)->dst.wscale = 0;
4428 (*state)->src.state = (*state)->dst.state =
4430 REASON_SET(reason, PFRES_SYNPROXY);
4431 return (PF_SYNPROXY_DROP);
4435 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
4436 sws = src->wscale & PF_WSCALE_MASK;
4437 dws = dst->wscale & PF_WSCALE_MASK;
4442 * Sequence tracking algorithm from Guido van Rooij's paper:
4443 * http://www.madison-gurkha.com/publications/tcp_filtering/
4447 orig_seq = seq = ntohl(th->th_seq);
4448 if (src->seqlo == 0) {
4449 /* First packet from this end. Set its state */
4451 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
4452 src->scrub == NULL) {
4453 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
4454 REASON_SET(reason, PFRES_MEMORY);
4459 /* Deferred generation of sequence number modulator */
4460 if (dst->seqdiff && !src->seqdiff) {
4461 while ((src->seqdiff = pf_new_isn(*state) - seq) == 0)
4463 ack = ntohl(th->th_ack) - dst->seqdiff;
4464 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
4466 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
4469 ack = ntohl(th->th_ack);
4472 end = seq + pd->p_len;
4473 if (th->th_flags & TH_SYN) {
4475 (*state)->sync_flags |= PFSTATE_GOT_SYN2;
4476 if (dst->wscale & PF_WSCALE_FLAG) {
4477 src->wscale = pf_get_wscale(m, off, th->th_off,
4479 if (src->wscale & PF_WSCALE_FLAG) {
4480 /* Remove scale factor from initial
4482 sws = src->wscale & PF_WSCALE_MASK;
4483 win = ((u_int32_t)win + (1 << sws) - 1)
4485 dws = dst->wscale & PF_WSCALE_MASK;
4487 /* fixup other window */
4488 dst->max_win <<= dst->wscale &
4490 /* in case of a retrans SYN|ACK */
4495 if (th->th_flags & TH_FIN)
4499 if (src->state < TCPS_SYN_SENT)
4500 src->state = TCPS_SYN_SENT;
4503 * May need to slide the window (seqhi may have been set by
4504 * the crappy stack check or if we picked up the connection
4505 * after establishment)
4507 if (src->seqhi == 1 ||
4508 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
4509 src->seqhi = end + MAX(1, dst->max_win << dws);
4510 if (win > src->max_win)
4514 ack = ntohl(th->th_ack) - dst->seqdiff;
4516 /* Modulate sequence numbers */
4517 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
4519 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
4522 end = seq + pd->p_len;
4523 if (th->th_flags & TH_SYN)
4525 if (th->th_flags & TH_FIN)
4529 if ((th->th_flags & TH_ACK) == 0) {
4530 /* Let it pass through the ack skew check */
4532 } else if ((ack == 0 &&
4533 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
4534 /* broken tcp stacks do not set ack */
4535 (dst->state < TCPS_SYN_SENT)) {
4537 * Many stacks (ours included) will set the ACK number in an
4538 * FIN|ACK if the SYN times out -- no sequence to ACK.
4544 /* Ease sequencing restrictions on no data packets */
4549 ackskew = dst->seqlo - ack;
4553 * Need to demodulate the sequence numbers in any TCP SACK options
4554 * (Selective ACK). We could optionally validate the SACK values
4555 * against the current ACK window, either forwards or backwards, but
4556 * I'm not confident that SACK has been implemented properly
4557 * everywhere. It wouldn't surprise me if several stacks accidently
4558 * SACK too far backwards of previously ACKed data. There really aren't
4559 * any security implications of bad SACKing unless the target stack
4560 * doesn't validate the option length correctly. Someone trying to
4561 * spoof into a TCP connection won't bother blindly sending SACK
4564 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) {
4565 if (pf_modulate_sack(m, off, pd, th, dst))
4570 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */
4571 if (SEQ_GEQ(src->seqhi, end) &&
4572 /* Last octet inside other's window space */
4573 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
4574 /* Retrans: not more than one window back */
4575 (ackskew >= -MAXACKWINDOW) &&
4576 /* Acking not more than one reassembled fragment backwards */
4577 (ackskew <= (MAXACKWINDOW << sws)) &&
4578 /* Acking not more than one window forward */
4579 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo ||
4580 (orig_seq == src->seqlo + 1) || (pd->flags & PFDESC_IP_REAS) == 0)) {
4581 /* Require an exact/+1 sequence match on resets when possible */
4583 if (dst->scrub || src->scrub) {
4584 if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4585 *state, src, dst, ©back))
4589 /* update max window */
4590 if (src->max_win < win)
4592 /* synchronize sequencing */
4593 if (SEQ_GT(end, src->seqlo))
4595 /* slide the window of what the other end can send */
4596 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4597 dst->seqhi = ack + MAX((win << sws), 1);
4601 if (th->th_flags & TH_SYN)
4602 if (src->state < TCPS_SYN_SENT)
4603 src->state = TCPS_SYN_SENT;
4604 if (th->th_flags & TH_FIN)
4605 if (src->state < TCPS_CLOSING)
4606 src->state = TCPS_CLOSING;
4607 if (th->th_flags & TH_ACK) {
4608 if (dst->state == TCPS_SYN_SENT) {
4609 dst->state = TCPS_ESTABLISHED;
4610 if (src->state == TCPS_ESTABLISHED &&
4611 (*state)->src_node != NULL &&
4612 pf_src_connlimit(state)) {
4613 REASON_SET(reason, PFRES_SRCLIMIT);
4616 } else if (dst->state == TCPS_CLOSING)
4617 dst->state = TCPS_FIN_WAIT_2;
4619 if (th->th_flags & TH_RST)
4620 src->state = dst->state = TCPS_TIME_WAIT;
4622 /* update expire time */
4623 (*state)->expire = time_second;
4624 if (src->state >= TCPS_FIN_WAIT_2 &&
4625 dst->state >= TCPS_FIN_WAIT_2)
4626 (*state)->timeout = PFTM_TCP_CLOSED;
4627 else if (src->state >= TCPS_CLOSING &&
4628 dst->state >= TCPS_CLOSING)
4629 (*state)->timeout = PFTM_TCP_FIN_WAIT;
4630 else if (src->state < TCPS_ESTABLISHED ||
4631 dst->state < TCPS_ESTABLISHED)
4632 (*state)->timeout = PFTM_TCP_OPENING;
4633 else if (src->state >= TCPS_CLOSING ||
4634 dst->state >= TCPS_CLOSING)
4635 (*state)->timeout = PFTM_TCP_CLOSING;
4637 (*state)->timeout = PFTM_TCP_ESTABLISHED;
4639 /* Fall through to PASS packet */
4641 } else if ((dst->state < TCPS_SYN_SENT ||
4642 dst->state >= TCPS_FIN_WAIT_2 ||
4643 src->state >= TCPS_FIN_WAIT_2) &&
4644 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
4645 /* Within a window forward of the originating packet */
4646 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
4647 /* Within a window backward of the originating packet */
4650 * This currently handles three situations:
4651 * 1) Stupid stacks will shotgun SYNs before their peer
4653 * 2) When PF catches an already established stream (the
4654 * firewall rebooted, the state table was flushed, routes
4656 * 3) Packets get funky immediately after the connection
4657 * closes (this should catch Solaris spurious ACK|FINs
4658 * that web servers like to spew after a close)
4660 * This must be a little more careful than the above code
4661 * since packet floods will also be caught here. We don't
4662 * update the TTL here to mitigate the damage of a packet
4663 * flood and so the same code can handle awkward establishment
4664 * and a loosened connection close.
4665 * In the establishment case, a correct peer response will
4666 * validate the connection, go through the normal state code
4667 * and keep updating the state TTL.
4670 if (pf_status.debug >= PF_DEBUG_MISC) {
4671 kprintf("pf: loose state match: ");
4672 pf_print_state(*state);
4673 pf_print_flags(th->th_flags);
4674 kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4675 "pkts=%llu:%llu\n", seq, orig_seq, ack, pd->p_len,
4676 ackskew, (unsigned long long)(*state)->packets[0],
4677 (unsigned long long)(*state)->packets[1]);
4680 if (dst->scrub || src->scrub) {
4681 if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4682 *state, src, dst, ©back))
4686 /* update max window */
4687 if (src->max_win < win)
4689 /* synchronize sequencing */
4690 if (SEQ_GT(end, src->seqlo))
4692 /* slide the window of what the other end can send */
4693 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4694 dst->seqhi = ack + MAX((win << sws), 1);
4697 * Cannot set dst->seqhi here since this could be a shotgunned
4698 * SYN and not an already established connection.
4701 if (th->th_flags & TH_FIN)
4702 if (src->state < TCPS_CLOSING)
4703 src->state = TCPS_CLOSING;
4704 if (th->th_flags & TH_RST)
4705 src->state = dst->state = TCPS_TIME_WAIT;
4707 /* Fall through to PASS packet */
4709 } else if ((*state)->pickup_mode == PF_PICKUPS_HASHONLY ||
4710 ((*state)->pickup_mode == PF_PICKUPS_ENABLED &&
4711 ((*state)->sync_flags & PFSTATE_GOT_SYN_MASK) !=
4712 PFSTATE_GOT_SYN_MASK)) {
4714 * If pickup mode is hash only, do not fail on sequence checks.
4716 * If pickup mode is enabled and we did not see the SYN in
4717 * both direction, do not fail on sequence checks because
4718 * we do not have complete information on window scale.
4720 * Adjust expiration and fall through to PASS packet.
4721 * XXX Add a FIN check to reduce timeout?
4723 (*state)->expire = time_second;
4726 * Failure processing
4728 if ((*state)->dst.state == TCPS_SYN_SENT &&
4729 (*state)->src.state == TCPS_SYN_SENT) {
4730 /* Send RST for state mismatches during handshake */
4731 if (!(th->th_flags & TH_RST))
4732 pf_send_tcp((*state)->rule.ptr, pd->af,
4733 pd->dst, pd->src, th->th_dport,
4734 th->th_sport, ntohl(th->th_ack), 0,
4736 (*state)->rule.ptr->return_ttl, 1, 0,
4737 pd->eh, kif->pfik_ifp);
4741 } else if (pf_status.debug >= PF_DEBUG_MISC) {
4742 kprintf("pf: BAD state: ");
4743 pf_print_state(*state);
4744 pf_print_flags(th->th_flags);
4745 kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4746 "pkts=%llu:%llu dir=%s,%s\n",
4747 seq, orig_seq, ack, pd->p_len, ackskew,
4748 (unsigned long long)(*state)->packets[0],
4749 (unsigned long long)(*state)->packets[1],
4750 direction == PF_IN ? "in" : "out",
4751 direction == (*state)->direction ? "fwd" : "rev");
4752 kprintf("pf: State failure on: %c %c %c %c | %c %c\n",
4753 SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
4754 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
4756 (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
4757 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
4758 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
4759 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
4761 REASON_SET(reason, PFRES_BADSTATE);
4765 /* Any packets which have gotten here are to be passed */
4767 /* translate source/destination address, if necessary */
4768 if (STATE_TRANSLATE(*state)) {
4769 if (direction == PF_OUT) {
4770 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum,
4771 &th->th_sum, &(*state)->gwy.addr,
4772 (*state)->gwy.port, 0, pd->af);
4775 * If we don't redispatch the packet will go into
4776 * the protocol stack on the wrong cpu for the
4777 * post-translated address.
4779 m->m_pkthdr.fw_flags |= FW_MBUF_REDISPATCH;
4780 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum,
4781 &th->th_sum, &(*state)->lan.addr,
4782 (*state)->lan.port, 0, pd->af);
4784 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4785 } else if (copyback) {
4786 /* Copyback sequence modulation or stateful scrub changes */
4787 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4794 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
4795 struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4797 struct pf_state_peer *src, *dst;
4798 struct pf_state_cmp key;
4799 struct udphdr *uh = pd->hdr.udp;
4802 key.proto = IPPROTO_UDP;
4803 if (direction == PF_IN) {
4804 PF_ACPY(&key.ext.addr, pd->src, key.af);
4805 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
4806 key.ext.port = uh->uh_sport;
4807 key.gwy.port = uh->uh_dport;
4809 PF_ACPY(&key.lan.addr, pd->src, key.af);
4810 PF_ACPY(&key.ext.addr, pd->dst, key.af);
4811 key.lan.port = uh->uh_sport;
4812 key.ext.port = uh->uh_dport;
4817 if (direction == (*state)->direction) {
4818 src = &(*state)->src;
4819 dst = &(*state)->dst;
4821 src = &(*state)->dst;
4822 dst = &(*state)->src;
4826 if (src->state < PFUDPS_SINGLE)
4827 src->state = PFUDPS_SINGLE;
4828 if (dst->state == PFUDPS_SINGLE)
4829 dst->state = PFUDPS_MULTIPLE;
4831 /* update expire time */
4832 (*state)->expire = time_second;
4833 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
4834 (*state)->timeout = PFTM_UDP_MULTIPLE;
4836 (*state)->timeout = PFTM_UDP_SINGLE;
4838 /* translate source/destination address, if necessary */
4839 if (STATE_TRANSLATE(*state)) {
4840 if (direction == PF_OUT) {
4841 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum,
4842 &uh->uh_sum, &(*state)->gwy.addr,
4843 (*state)->gwy.port, 1, pd->af);
4846 * If we don't redispatch the packet will go into
4847 * the protocol stack on the wrong cpu for the
4848 * post-translated address.
4850 m->m_pkthdr.fw_flags |= FW_MBUF_REDISPATCH;
4851 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum,
4852 &uh->uh_sum, &(*state)->lan.addr,
4853 (*state)->lan.port, 1, pd->af);
4855 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
4862 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
4863 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason)
4865 struct pf_addr *saddr = pd->src, *daddr = pd->dst;
4866 u_int16_t icmpid = 0, *icmpsum;
4869 struct pf_state_cmp key;
4871 switch (pd->proto) {
4874 icmptype = pd->hdr.icmp->icmp_type;
4875 icmpid = pd->hdr.icmp->icmp_id;
4876 icmpsum = &pd->hdr.icmp->icmp_cksum;
4878 if (icmptype == ICMP_UNREACH ||
4879 icmptype == ICMP_SOURCEQUENCH ||
4880 icmptype == ICMP_REDIRECT ||
4881 icmptype == ICMP_TIMXCEED ||
4882 icmptype == ICMP_PARAMPROB)
4887 case IPPROTO_ICMPV6:
4888 icmptype = pd->hdr.icmp6->icmp6_type;
4889 icmpid = pd->hdr.icmp6->icmp6_id;
4890 icmpsum = &pd->hdr.icmp6->icmp6_cksum;
4892 if (icmptype == ICMP6_DST_UNREACH ||
4893 icmptype == ICMP6_PACKET_TOO_BIG ||
4894 icmptype == ICMP6_TIME_EXCEEDED ||
4895 icmptype == ICMP6_PARAM_PROB)
4904 * ICMP query/reply message not related to a TCP/UDP packet.
4905 * Search for an ICMP state.
4908 key.proto = pd->proto;
4909 if (direction == PF_IN) {
4910 PF_ACPY(&key.ext.addr, pd->src, key.af);
4911 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
4913 key.gwy.port = icmpid;
4915 PF_ACPY(&key.lan.addr, pd->src, key.af);
4916 PF_ACPY(&key.ext.addr, pd->dst, key.af);
4917 key.lan.port = icmpid;
4923 (*state)->expire = time_second;
4924 (*state)->timeout = PFTM_ICMP_ERROR_REPLY;
4926 /* translate source/destination address, if necessary */
4927 if (STATE_TRANSLATE(*state)) {
4928 if (direction == PF_OUT) {
4932 pf_change_a(&saddr->v4.s_addr,
4934 (*state)->gwy.addr.v4.s_addr, 0);
4935 pd->hdr.icmp->icmp_cksum =
4937 pd->hdr.icmp->icmp_cksum, icmpid,
4938 (*state)->gwy.port, 0);
4939 pd->hdr.icmp->icmp_id =
4941 m_copyback(m, off, ICMP_MINLEN,
4942 (caddr_t)pd->hdr.icmp);
4948 &pd->hdr.icmp6->icmp6_cksum,
4949 &(*state)->gwy.addr, 0);
4951 sizeof(struct icmp6_hdr),
4952 (caddr_t)pd->hdr.icmp6);
4960 pf_change_a(&daddr->v4.s_addr,
4962 (*state)->lan.addr.v4.s_addr, 0);
4963 pd->hdr.icmp->icmp_cksum =
4965 pd->hdr.icmp->icmp_cksum, icmpid,
4966 (*state)->lan.port, 0);
4967 pd->hdr.icmp->icmp_id =
4969 m_copyback(m, off, ICMP_MINLEN,
4970 (caddr_t)pd->hdr.icmp);
4976 &pd->hdr.icmp6->icmp6_cksum,
4977 &(*state)->lan.addr, 0);
4979 sizeof(struct icmp6_hdr),
4980 (caddr_t)pd->hdr.icmp6);
4991 * ICMP error message in response to a TCP/UDP packet.
4992 * Extract the inner TCP/UDP header and search for that state.
4995 struct pf_pdesc pd2;
5000 struct ip6_hdr h2_6;
5010 /* offset of h2 in mbuf chain */
5011 ipoff2 = off + ICMP_MINLEN;
5013 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
5014 NULL, reason, pd2.af)) {
5015 DPFPRINTF(PF_DEBUG_MISC,
5016 ("pf: ICMP error message too short "
5021 * ICMP error messages don't refer to non-first
5024 if (h2.ip_off & htons(IP_OFFMASK)) {
5025 REASON_SET(reason, PFRES_FRAG);
5029 /* offset of protocol header that follows h2 */
5030 off2 = ipoff2 + (h2.ip_hl << 2);
5032 pd2.proto = h2.ip_p;
5033 pd2.src = (struct pf_addr *)&h2.ip_src;
5034 pd2.dst = (struct pf_addr *)&h2.ip_dst;
5035 pd2.ip_sum = &h2.ip_sum;
5040 ipoff2 = off + sizeof(struct icmp6_hdr);
5042 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
5043 NULL, reason, pd2.af)) {
5044 DPFPRINTF(PF_DEBUG_MISC,
5045 ("pf: ICMP error message too short "
5049 pd2.proto = h2_6.ip6_nxt;
5050 pd2.src = (struct pf_addr *)&h2_6.ip6_src;
5051 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
5053 off2 = ipoff2 + sizeof(h2_6);
5055 switch (pd2.proto) {
5056 case IPPROTO_FRAGMENT:
5058 * ICMPv6 error messages for
5059 * non-first fragments
5061 REASON_SET(reason, PFRES_FRAG);
5064 case IPPROTO_HOPOPTS:
5065 case IPPROTO_ROUTING:
5066 case IPPROTO_DSTOPTS: {
5067 /* get next header and header length */
5068 struct ip6_ext opt6;
5070 if (!pf_pull_hdr(m, off2, &opt6,
5071 sizeof(opt6), NULL, reason,
5073 DPFPRINTF(PF_DEBUG_MISC,
5074 ("pf: ICMPv6 short opt\n"));
5077 if (pd2.proto == IPPROTO_AH)
5078 off2 += (opt6.ip6e_len + 2) * 4;
5080 off2 += (opt6.ip6e_len + 1) * 8;
5081 pd2.proto = opt6.ip6e_nxt;
5082 /* goto the next header */
5089 } while (!terminal);
5093 DPFPRINTF(PF_DEBUG_MISC,
5094 ("pf: ICMP AF %d unknown (ip6)\n", pd->af));
5099 switch (pd2.proto) {
5103 struct pf_state_cmp key;
5104 struct pf_state_peer *src, *dst;
5109 * Only the first 8 bytes of the TCP header can be
5110 * expected. Don't access any TCP header fields after
5111 * th_seq, an ackskew test is not possible.
5113 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason,
5115 DPFPRINTF(PF_DEBUG_MISC,
5116 ("pf: ICMP error message too short "
5122 key.proto = IPPROTO_TCP;
5123 if (direction == PF_IN) {
5124 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
5125 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
5126 key.ext.port = th.th_dport;
5127 key.gwy.port = th.th_sport;
5129 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
5130 PF_ACPY(&key.ext.addr, pd2.src, key.af);
5131 key.lan.port = th.th_dport;
5132 key.ext.port = th.th_sport;
5137 if (direction == (*state)->direction) {
5138 src = &(*state)->dst;
5139 dst = &(*state)->src;
5141 src = &(*state)->src;
5142 dst = &(*state)->dst;
5145 if (src->wscale && dst->wscale &&
5146 !(th.th_flags & TH_SYN))
5147 dws = dst->wscale & PF_WSCALE_MASK;
5151 /* Demodulate sequence number */
5152 seq = ntohl(th.th_seq) - src->seqdiff;
5154 pf_change_a(&th.th_seq, icmpsum,
5159 if (!SEQ_GEQ(src->seqhi, seq) ||
5160 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) {
5161 if (pf_status.debug >= PF_DEBUG_MISC) {
5162 kprintf("pf: BAD ICMP %d:%d ",
5163 icmptype, pd->hdr.icmp->icmp_code);
5164 pf_print_host(pd->src, 0, pd->af);
5166 pf_print_host(pd->dst, 0, pd->af);
5167 kprintf(" state: ");
5168 pf_print_state(*state);
5169 kprintf(" seq=%u\n", seq);
5171 REASON_SET(reason, PFRES_BADSTATE);
5175 if (STATE_TRANSLATE(*state)) {
5176 if (direction == PF_IN) {
5177 pf_change_icmp(pd2.src, &th.th_sport,
5178 daddr, &(*state)->lan.addr,
5179 (*state)->lan.port, NULL,
5180 pd2.ip_sum, icmpsum,
5181 pd->ip_sum, 0, pd2.af);
5183 pf_change_icmp(pd2.dst, &th.th_dport,
5184 saddr, &(*state)->gwy.addr,
5185 (*state)->gwy.port, NULL,
5186 pd2.ip_sum, icmpsum,
5187 pd->ip_sum, 0, pd2.af);
5196 m_copyback(m, off, ICMP_MINLEN,
5197 (caddr_t)pd->hdr.icmp);
5198 m_copyback(m, ipoff2, sizeof(h2),
5205 sizeof(struct icmp6_hdr),
5206 (caddr_t)pd->hdr.icmp6);
5207 m_copyback(m, ipoff2, sizeof(h2_6),
5212 m_copyback(m, off2, 8, (caddr_t)&th);
5221 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
5222 NULL, reason, pd2.af)) {
5223 DPFPRINTF(PF_DEBUG_MISC,
5224 ("pf: ICMP error message too short "
5230 key.proto = IPPROTO_UDP;
5231 if (direction == PF_IN) {
5232 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
5233 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
5234 key.ext.port = uh.uh_dport;
5235 key.gwy.port = uh.uh_sport;
5237 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
5238 PF_ACPY(&key.ext.addr, pd2.src, key.af);
5239 key.lan.port = uh.uh_dport;
5240 key.ext.port = uh.uh_sport;
5245 if (STATE_TRANSLATE(*state)) {
5246 if (direction == PF_IN) {
5247 pf_change_icmp(pd2.src, &uh.uh_sport,
5248 daddr, &(*state)->lan.addr,
5249 (*state)->lan.port, &uh.uh_sum,
5250 pd2.ip_sum, icmpsum,
5251 pd->ip_sum, 1, pd2.af);
5253 pf_change_icmp(pd2.dst, &uh.uh_dport,
5254 saddr, &(*state)->gwy.addr,
5255 (*state)->gwy.port, &uh.uh_sum,
5256 pd2.ip_sum, icmpsum,
5257 pd->ip_sum, 1, pd2.af);
5262 m_copyback(m, off, ICMP_MINLEN,
5263 (caddr_t)pd->hdr.icmp);
5264 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5270 sizeof(struct icmp6_hdr),
5271 (caddr_t)pd->hdr.icmp6);
5272 m_copyback(m, ipoff2, sizeof(h2_6),
5277 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh);
5284 case IPPROTO_ICMP: {
5287 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
5288 NULL, reason, pd2.af)) {
5289 DPFPRINTF(PF_DEBUG_MISC,
5290 ("pf: ICMP error message too short i"
5296 key.proto = IPPROTO_ICMP;
5297 if (direction == PF_IN) {
5298 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
5299 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
5301 key.gwy.port = iih.icmp_id;
5303 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
5304 PF_ACPY(&key.ext.addr, pd2.src, key.af);
5305 key.lan.port = iih.icmp_id;
5311 if (STATE_TRANSLATE(*state)) {
5312 if (direction == PF_IN) {
5313 pf_change_icmp(pd2.src, &iih.icmp_id,
5314 daddr, &(*state)->lan.addr,
5315 (*state)->lan.port, NULL,
5316 pd2.ip_sum, icmpsum,
5317 pd->ip_sum, 0, AF_INET);
5319 pf_change_icmp(pd2.dst, &iih.icmp_id,
5320 saddr, &(*state)->gwy.addr,
5321 (*state)->gwy.port, NULL,
5322 pd2.ip_sum, icmpsum,
5323 pd->ip_sum, 0, AF_INET);
5325 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
5326 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5327 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih);
5335 case IPPROTO_ICMPV6: {
5336 struct icmp6_hdr iih;
5338 if (!pf_pull_hdr(m, off2, &iih,
5339 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) {
5340 DPFPRINTF(PF_DEBUG_MISC,
5341 ("pf: ICMP error message too short "
5347 key.proto = IPPROTO_ICMPV6;
5348 if (direction == PF_IN) {
5349 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
5350 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
5352 key.gwy.port = iih.icmp6_id;
5354 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
5355 PF_ACPY(&key.ext.addr, pd2.src, key.af);
5356 key.lan.port = iih.icmp6_id;
5362 if (STATE_TRANSLATE(*state)) {
5363 if (direction == PF_IN) {
5364 pf_change_icmp(pd2.src, &iih.icmp6_id,
5365 daddr, &(*state)->lan.addr,
5366 (*state)->lan.port, NULL,
5367 pd2.ip_sum, icmpsum,
5368 pd->ip_sum, 0, AF_INET6);
5370 pf_change_icmp(pd2.dst, &iih.icmp6_id,
5371 saddr, &(*state)->gwy.addr,
5372 (*state)->gwy.port, NULL,
5373 pd2.ip_sum, icmpsum,
5374 pd->ip_sum, 0, AF_INET6);
5376 m_copyback(m, off, sizeof(struct icmp6_hdr),
5377 (caddr_t)pd->hdr.icmp6);
5378 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6);
5379 m_copyback(m, off2, sizeof(struct icmp6_hdr),
5389 key.proto = pd2.proto;
5390 if (direction == PF_IN) {
5391 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
5392 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
5396 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
5397 PF_ACPY(&key.ext.addr, pd2.src, key.af);
5404 if (STATE_TRANSLATE(*state)) {
5405 if (direction == PF_IN) {
5406 pf_change_icmp(pd2.src, NULL,
5407 daddr, &(*state)->lan.addr,
5409 pd2.ip_sum, icmpsum,
5410 pd->ip_sum, 0, pd2.af);
5412 pf_change_icmp(pd2.dst, NULL,
5413 saddr, &(*state)->gwy.addr,
5415 pd2.ip_sum, icmpsum,
5416 pd->ip_sum, 0, pd2.af);
5421 m_copyback(m, off, ICMP_MINLEN,
5422 (caddr_t)pd->hdr.icmp);
5423 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5429 sizeof(struct icmp6_hdr),
5430 (caddr_t)pd->hdr.icmp6);
5431 m_copyback(m, ipoff2, sizeof(h2_6),
5446 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
5447 struct pf_pdesc *pd)
5449 struct pf_state_peer *src, *dst;
5450 struct pf_state_cmp key;
5453 key.proto = pd->proto;
5454 if (direction == PF_IN) {
5455 PF_ACPY(&key.ext.addr, pd->src, key.af);
5456 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
5460 PF_ACPY(&key.lan.addr, pd->src, key.af);
5461 PF_ACPY(&key.ext.addr, pd->dst, key.af);
5468 if (direction == (*state)->direction) {
5469 src = &(*state)->src;
5470 dst = &(*state)->dst;
5472 src = &(*state)->dst;
5473 dst = &(*state)->src;
5477 if (src->state < PFOTHERS_SINGLE)
5478 src->state = PFOTHERS_SINGLE;
5479 if (dst->state == PFOTHERS_SINGLE)
5480 dst->state = PFOTHERS_MULTIPLE;
5482 /* update expire time */
5483 (*state)->expire = time_second;
5484 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
5485 (*state)->timeout = PFTM_OTHER_MULTIPLE;
5487 (*state)->timeout = PFTM_OTHER_SINGLE;
5489 /* translate source/destination address, if necessary */
5490 if (STATE_TRANSLATE(*state)) {
5491 if (direction == PF_OUT)
5495 pf_change_a(&pd->src->v4.s_addr,
5496 pd->ip_sum, (*state)->gwy.addr.v4.s_addr,
5502 PF_ACPY(pd->src, &(*state)->gwy.addr, pd->af);
5510 pf_change_a(&pd->dst->v4.s_addr,
5511 pd->ip_sum, (*state)->lan.addr.v4.s_addr,
5517 PF_ACPY(pd->dst, &(*state)->lan.addr, pd->af);
5527 * ipoff and off are measured from the start of the mbuf chain.
5528 * h must be at "ipoff" on the mbuf chain.
5531 pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
5532 u_short *actionp, u_short *reasonp, sa_family_t af)
5537 struct ip *h = mtod(m, struct ip *);
5538 u_int16_t fragoff = (h->ip_off & IP_OFFMASK) << 3;
5542 ACTION_SET(actionp, PF_PASS);
5544 ACTION_SET(actionp, PF_DROP);
5545 REASON_SET(reasonp, PFRES_FRAG);
5549 if (m->m_pkthdr.len < off + len ||
5550 h->ip_len < off + len) {
5551 ACTION_SET(actionp, PF_DROP);
5552 REASON_SET(reasonp, PFRES_SHORT);
5560 struct ip6_hdr *h = mtod(m, struct ip6_hdr *);
5562 if (m->m_pkthdr.len < off + len ||
5563 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
5564 (unsigned)(off + len)) {
5565 ACTION_SET(actionp, PF_DROP);
5566 REASON_SET(reasonp, PFRES_SHORT);
5573 m_copydata(m, off, len, p);
5578 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif)
5580 struct sockaddr_in *dst;
5584 struct sockaddr_in6 *dst6;
5585 struct route_in6 ro;
5589 struct radix_node *rn;
5594 bzero(&ro, sizeof(ro));
5597 dst = satosin(&ro.ro_dst);
5598 dst->sin_family = AF_INET;
5599 dst->sin_len = sizeof(*dst);
5600 dst->sin_addr = addr->v4;
5604 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
5605 dst6->sin6_family = AF_INET6;
5606 dst6->sin6_len = sizeof(*dst6);
5607 dst6->sin6_addr = addr->v6;
5614 /* Skip checks for ipsec interfaces */
5615 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
5618 rtalloc_ign((struct route *)&ro, 0);
5620 if (ro.ro_rt != NULL) {
5621 /* No interface given, this is a no-route check */
5625 if (kif->pfik_ifp == NULL) {
5630 /* Perform uRPF check if passed input interface */
5632 rn = (struct radix_node *)ro.ro_rt;
5634 rt = (struct rtentry *)rn;
5637 if (kif->pfik_ifp == ifp)
5640 } while (check_mpath == 1 && rn != NULL && ret == 0);
5644 if (ro.ro_rt != NULL)
5650 pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw)
5652 struct sockaddr_in *dst;
5654 struct sockaddr_in6 *dst6;
5655 struct route_in6 ro;
5661 bzero(&ro, sizeof(ro));
5664 dst = satosin(&ro.ro_dst);
5665 dst->sin_family = AF_INET;
5666 dst->sin_len = sizeof(*dst);
5667 dst->sin_addr = addr->v4;
5671 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
5672 dst6->sin6_family = AF_INET6;
5673 dst6->sin6_len = sizeof(*dst6);
5674 dst6->sin6_addr = addr->v6;
5681 rtalloc_ign((struct route *)&ro, (RTF_CLONING | RTF_PRCLONING));
5683 if (ro.ro_rt != NULL) {
5692 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5693 struct pf_state *s, struct pf_pdesc *pd)
5695 struct mbuf *m0, *m1;
5696 struct route iproute;
5697 struct route *ro = NULL;
5698 struct sockaddr_in *dst;
5700 struct ifnet *ifp = NULL;
5701 struct pf_addr naddr;
5702 struct pf_src_node *sn = NULL;
5709 if (m == NULL || *m == NULL || r == NULL ||
5710 (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
5711 panic("pf_route: invalid parameters");
5713 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
5714 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
5715 (*m)->m_pkthdr.pf_routed = 1;
5717 if ((*m)->m_pkthdr.pf_routed > 3) {
5722 (*m)->m_pkthdr.pf_routed++;
5725 if (r->rt == PF_DUPTO) {
5726 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL)
5729 if ((r->rt == PF_REPLYTO) == (r->direction == dir))
5734 if (m0->m_len < sizeof(struct ip)) {
5735 DPFPRINTF(PF_DEBUG_URGENT,
5736 ("pf_route: m0->m_len < sizeof(struct ip)\n"));
5740 ip = mtod(m0, struct ip *);
5743 bzero((caddr_t)ro, sizeof(*ro));
5744 dst = satosin(&ro->ro_dst);
5745 dst->sin_family = AF_INET;
5746 dst->sin_len = sizeof(*dst);
5747 dst->sin_addr = ip->ip_dst;
5749 if (r->rt == PF_FASTROUTE) {
5751 if (ro->ro_rt == 0) {
5752 ipstat.ips_noroute++;
5756 ifp = ro->ro_rt->rt_ifp;
5757 ro->ro_rt->rt_use++;
5759 if (ro->ro_rt->rt_flags & RTF_GATEWAY)
5760 dst = satosin(ro->ro_rt->rt_gateway);
5762 if (TAILQ_EMPTY(&r->rpool.list)) {
5763 DPFPRINTF(PF_DEBUG_URGENT,
5764 ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n"));
5768 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
5770 if (!PF_AZERO(&naddr, AF_INET))
5771 dst->sin_addr.s_addr = naddr.v4.s_addr;
5772 ifp = r->rpool.cur->kif ?
5773 r->rpool.cur->kif->pfik_ifp : NULL;
5775 if (!PF_AZERO(&s->rt_addr, AF_INET))
5776 dst->sin_addr.s_addr =
5777 s->rt_addr.v4.s_addr;
5778 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5786 if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) {
5789 } else if (m0 == NULL) {
5794 if (m0->m_len < sizeof(struct ip)) {
5795 DPFPRINTF(PF_DEBUG_URGENT,
5796 ("pf_route: m0->m_len < sizeof(struct ip)\n"));
5799 ip = mtod(m0, struct ip *);
5802 /* Copied from FreeBSD 5.1-CURRENT ip_output. */
5803 m0->m_pkthdr.csum_flags |= CSUM_IP;
5804 sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist;
5805 if (sw_csum & CSUM_DELAY_DATA) {
5807 * XXX: in_delayed_cksum assumes HBO for ip->ip_len (at least)
5810 NTOHS(ip->ip_off); /* XXX: needed? */
5811 in_delayed_cksum(m0);
5814 sw_csum &= ~CSUM_DELAY_DATA;
5816 m0->m_pkthdr.csum_flags &= ifp->if_hwassist;
5818 if (ntohs(ip->ip_len) <= ifp->if_mtu ||
5819 (ifp->if_hwassist & CSUM_FRAGMENT &&
5820 ((ip->ip_off & htons(IP_DF)) == 0))) {
5822 * ip->ip_len = htons(ip->ip_len);
5823 * ip->ip_off = htons(ip->ip_off);
5826 if (sw_csum & CSUM_DELAY_IP) {
5828 if (ip->ip_v == IPVERSION &&
5829 (ip->ip_hl << 2) == sizeof(*ip)) {
5830 ip->ip_sum = in_cksum_hdr(ip);
5832 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
5836 error = (*ifp->if_output)(ifp, m0, sintosa(dst), ro->ro_rt);
5842 * Too large for interface; fragment if possible.
5843 * Must be able to put at least 8 bytes per fragment.
5845 if (ip->ip_off & htons(IP_DF)) {
5846 ipstat.ips_cantfrag++;
5847 if (r->rt != PF_DUPTO) {
5848 /* icmp_error() expects host byte ordering */
5852 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
5862 * XXX: is cheaper + less error prone than own function
5866 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum);
5871 for (m0 = m1; m0; m0 = m1) {
5876 error = (*ifp->if_output)(ifp, m0, sintosa(dst),
5884 ipstat.ips_fragmented++;
5887 if (r->rt != PF_DUPTO)
5889 if (ro == &iproute && ro->ro_rt)
5901 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5902 struct pf_state *s, struct pf_pdesc *pd)
5905 struct route_in6 ip6route;
5906 struct route_in6 *ro;
5907 struct sockaddr_in6 *dst;
5908 struct ip6_hdr *ip6;
5909 struct ifnet *ifp = NULL;
5910 struct pf_addr naddr;
5911 struct pf_src_node *sn = NULL;
5914 if (m == NULL || *m == NULL || r == NULL ||
5915 (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
5916 panic("pf_route6: invalid parameters");
5918 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
5919 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
5920 (*m)->m_pkthdr.pf_routed = 1;
5922 if ((*m)->m_pkthdr.pf_routed > 3) {
5927 (*m)->m_pkthdr.pf_routed++;
5930 if (r->rt == PF_DUPTO) {
5931 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL)
5934 if ((r->rt == PF_REPLYTO) == (r->direction == dir))
5939 if (m0->m_len < sizeof(struct ip6_hdr)) {
5940 DPFPRINTF(PF_DEBUG_URGENT,
5941 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n"));
5944 ip6 = mtod(m0, struct ip6_hdr *);
5947 bzero((caddr_t)ro, sizeof(*ro));
5948 dst = (struct sockaddr_in6 *)&ro->ro_dst;
5949 dst->sin6_family = AF_INET6;
5950 dst->sin6_len = sizeof(*dst);
5951 dst->sin6_addr = ip6->ip6_dst;
5953 /* Cheat. XXX why only in the v6 case??? */
5954 if (r->rt == PF_FASTROUTE) {
5955 pd->pf_mtag->flags |= PF_TAG_GENERATED;
5957 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL);
5962 if (TAILQ_EMPTY(&r->rpool.list)) {
5963 DPFPRINTF(PF_DEBUG_URGENT,
5964 ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n"));
5968 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
5970 if (!PF_AZERO(&naddr, AF_INET6))
5971 PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5973 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
5975 if (!PF_AZERO(&s->rt_addr, AF_INET6))
5976 PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5977 &s->rt_addr, AF_INET6);
5978 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5985 if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) {
5988 } else if (m0 == NULL) {
5993 if (m0->m_len < sizeof(struct ip6_hdr)) {
5994 DPFPRINTF(PF_DEBUG_URGENT,
5995 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n"));
5998 ip6 = mtod(m0, struct ip6_hdr *);
6002 * If the packet is too large for the outgoing interface,
6003 * send back an icmp6 error.
6005 if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr))
6006 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
6007 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) {
6009 error = nd6_output(ifp, ifp, m0, dst, NULL);
6012 in6_ifstat_inc(ifp, ifs6_in_toobig);
6013 if (r->rt != PF_DUPTO) {
6015 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
6022 if (r->rt != PF_DUPTO)
6035 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag
6036 * off is the offset where the protocol header starts
6037 * len is the total length of protocol header plus payload
6038 * returns 0 when the checksum is valid, otherwise returns 1.
6042 * FreeBSD supports cksum offload for the following drivers.
6043 * em(4), gx(4), lge(4), nge(4), ti(4), xl(4)
6044 * If we can make full use of it we would outperform ipfw/ipfilter in
6045 * very heavy traffic.
6046 * I have not tested 'cause I don't have NICs that supports cksum offload.
6047 * (There might be problems. Typical phenomena would be
6048 * 1. No route message for UDP packet.
6049 * 2. No connection acceptance from external hosts regardless of rule set.)
6052 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p,
6059 if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
6061 if (m->m_pkthdr.len < off + len)
6067 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
6068 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
6069 sum = m->m_pkthdr.csum_data;
6071 ip = mtod(m, struct ip *);
6072 sum = in_pseudo(ip->ip_src.s_addr,
6073 ip->ip_dst.s_addr, htonl((u_short)len +
6074 m->m_pkthdr.csum_data + p));
6082 case IPPROTO_ICMPV6:
6092 if (p == IPPROTO_ICMP) {
6097 sum = in_cksum(m, len);
6101 if (m->m_len < sizeof(struct ip))
6103 sum = in_cksum_range(m, p, off, len);
6105 m->m_pkthdr.csum_flags |=
6108 m->m_pkthdr.csum_data = 0xffff;
6114 if (m->m_len < sizeof(struct ip6_hdr))
6116 sum = in6_cksum(m, p, off, len);
6119 * IPv6 H/W cksum off-load not supported yet!
6122 * m->m_pkthdr.csum_flags |=
6123 * (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
6124 * m->m_pkthdr.csum_data = 0xffff;
6136 tcpstat.tcps_rcvbadsum++;
6139 udpstat.udps_badsum++;
6142 icmpstat.icps_checksum++;
6145 case IPPROTO_ICMPV6:
6146 icmp6stat.icp6s_checksum++;
6157 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0,
6158 struct ether_header *eh, struct inpcb *inp)
6160 struct pfi_kif *kif;
6161 u_short action, reason = 0, log = 0;
6162 struct mbuf *m = *m0;
6163 struct ip *h = NULL;
6164 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr;
6165 struct pf_state *s = NULL;
6166 struct pf_ruleset *ruleset = NULL;
6168 int off, dirndx, pqid = 0;
6170 if (!pf_status.running)
6173 memset(&pd, 0, sizeof(pd));
6174 if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) {
6175 DPFPRINTF(PF_DEBUG_URGENT,
6176 ("pf_test: pf_get_mtag returned NULL\n"));
6179 if (pd.pf_mtag->flags & PF_TAG_GENERATED)
6181 kif = (struct pfi_kif *)ifp->if_pf_kif;
6183 DPFPRINTF(PF_DEBUG_URGENT,
6184 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname));
6187 if (kif->pfik_flags & PFI_IFLAG_SKIP)
6191 if ((m->m_flags & M_PKTHDR) == 0)
6192 panic("non-M_PKTHDR is passed to pf_test");
6193 #endif /* DIAGNOSTIC */
6195 if (m->m_pkthdr.len < (int)sizeof(*h)) {
6197 REASON_SET(&reason, PFRES_SHORT);
6203 /* We do IP header normalization and packet reassembly here */
6204 if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) {
6209 h = mtod(m, struct ip *);
6211 off = h->ip_hl << 2;
6212 if (off < (int)sizeof(*h)) {
6214 REASON_SET(&reason, PFRES_SHORT);
6220 pd.src = (struct pf_addr *)&h->ip_src;
6221 pd.dst = (struct pf_addr *)&h->ip_dst;
6222 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET);
6223 pd.ip_sum = &h->ip_sum;
6227 pd.tot_len = h->ip_len;
6230 /* handle fragments that didn't get reassembled by normalization */
6231 if (h->ip_off & (IP_MF | IP_OFFMASK)) {
6232 action = pf_test_fragment(&r, dir, kif, m, h,
6242 if (!pf_pull_hdr(m, off, &th, sizeof(th),
6243 &action, &reason, AF_INET)) {
6244 log = action != PF_PASS;
6247 if (dir == PF_IN && pf_check_proto_cksum(m, off,
6248 h->ip_len - off, IPPROTO_TCP, AF_INET)) {
6249 REASON_SET(&reason, PFRES_PROTCKSUM);
6253 pd.p_len = pd.tot_len - off - (th.th_off << 2);
6254 if ((th.th_flags & TH_ACK) && pd.p_len == 0)
6256 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
6257 if (action == PF_DROP)
6259 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
6261 if (action == PF_PASS) {
6263 pfsync_update_state(s);
6264 #endif /* NPFSYNC */
6268 } else if (s == NULL) {
6269 action = pf_test_tcp(&r, &s, dir, kif,
6270 m, off, h, &pd, &a, &ruleset, NULL, inp);
6279 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
6280 &action, &reason, AF_INET)) {
6281 log = action != PF_PASS;
6284 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m,
6285 off, h->ip_len - off, IPPROTO_UDP, AF_INET)) {
6287 REASON_SET(&reason, PFRES_PROTCKSUM);
6290 if (uh.uh_dport == 0 ||
6291 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
6292 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
6294 REASON_SET(&reason, PFRES_SHORT);
6297 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
6298 if (action == PF_PASS) {
6300 pfsync_update_state(s);
6301 #endif /* NPFSYNC */
6305 } else if (s == NULL)
6306 action = pf_test_udp(&r, &s, dir, kif,
6307 m, off, h, &pd, &a, &ruleset, NULL, inp);
6311 case IPPROTO_ICMP: {
6315 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
6316 &action, &reason, AF_INET)) {
6317 log = action != PF_PASS;
6320 if (dir == PF_IN && pf_check_proto_cksum(m, off,
6321 h->ip_len - off, IPPROTO_ICMP, AF_INET)) {
6323 REASON_SET(&reason, PFRES_PROTCKSUM);
6326 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd,
6328 if (action == PF_PASS) {
6330 pfsync_update_state(s);
6331 #endif /* NPFSYNC */
6335 } else if (s == NULL)
6336 action = pf_test_icmp(&r, &s, dir, kif,
6337 m, off, h, &pd, &a, &ruleset, NULL);
6342 action = pf_test_state_other(&s, dir, kif, &pd);
6343 if (action == PF_PASS) {
6345 pfsync_update_state(s);
6346 #endif /* NPFSYNC */
6350 } else if (s == NULL)
6351 action = pf_test_other(&r, &s, dir, kif, m, off, h,
6352 &pd, &a, &ruleset, NULL);
6357 if (action == PF_PASS && h->ip_hl > 5 &&
6358 !((s && s->allow_opts) || r->allow_opts)) {
6360 REASON_SET(&reason, PFRES_IPOPTIONS);
6362 DPFPRINTF(PF_DEBUG_MISC,
6363 ("pf: dropping packet with ip options\n"));
6366 if ((s && s->tag) || r->rtableid)
6367 pf_tag_packet(m, pd.pf_mtag, s ? s->tag : 0, r->rtableid);
6370 if (action == PF_PASS && r->qid) {
6371 if (pqid || (pd.tos & IPTOS_LOWDELAY))
6372 pd.pf_mtag->qid = r->pqid;
6374 pd.pf_mtag->qid = r->qid;
6375 /* add hints for ecn */
6376 pd.pf_mtag->af = AF_INET;
6377 pd.pf_mtag->hdr = h;
6378 /* add connection hash for fairq */
6380 KKASSERT(s->hash != 0);
6381 pd.pf_mtag->flags |= PF_TAG_STATE_HASHED;
6382 pd.pf_mtag->state_hash = s->hash;
6388 * connections redirected to loopback should not match sockets
6389 * bound specifically to loopback due to security implications,
6390 * see tcp_input() and in_pcblookup_listen().
6392 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
6393 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
6394 (s->nat_rule.ptr->action == PF_RDR ||
6395 s->nat_rule.ptr->action == PF_BINAT) &&
6396 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET)
6397 pd.pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST;
6402 if (s != NULL && s->nat_rule.ptr != NULL &&
6403 s->nat_rule.ptr->log & PF_LOG_ALL)
6404 lr = s->nat_rule.ptr;
6407 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset,
6411 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6412 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;
6414 if (action == PF_PASS || r->action == PF_DROP) {
6415 dirndx = (dir == PF_OUT);
6416 r->packets[dirndx]++;
6417 r->bytes[dirndx] += pd.tot_len;
6419 a->packets[dirndx]++;
6420 a->bytes[dirndx] += pd.tot_len;
6423 if (s->nat_rule.ptr != NULL) {
6424 s->nat_rule.ptr->packets[dirndx]++;
6425 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6427 if (s->src_node != NULL) {
6428 s->src_node->packets[dirndx]++;
6429 s->src_node->bytes[dirndx] += pd.tot_len;
6431 if (s->nat_src_node != NULL) {
6432 s->nat_src_node->packets[dirndx]++;
6433 s->nat_src_node->bytes[dirndx] += pd.tot_len;
6435 dirndx = (dir == s->direction) ? 0 : 1;
6436 s->packets[dirndx]++;
6437 s->bytes[dirndx] += pd.tot_len;
6440 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6444 * XXX: we need to make sure that the addresses
6445 * passed to pfr_update_stats() are the same than
6446 * the addresses used during matching (pfr_match)
6448 if (r == &pf_default_rule) {
6450 x = (s == NULL || s->direction == dir) ?
6451 &pd.baddr : &pd.naddr;
6453 x = (s == NULL || s->direction == dir) ?
6454 &pd.naddr : &pd.baddr;
6455 if (x == &pd.baddr || s == NULL) {
6456 /* we need to change the address */
6463 if (tr->src.addr.type == PF_ADDR_TABLE)
6464 pfr_update_stats(tr->src.addr.p.tbl, (s == NULL ||
6465 s->direction == dir) ? pd.src : pd.dst, pd.af,
6466 pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
6468 if (tr->dst.addr.type == PF_ADDR_TABLE)
6469 pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL ||
6470 s->direction == dir) ? pd.dst : pd.src, pd.af,
6471 pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
6476 if (action == PF_SYNPROXY_DROP) {
6481 /* pf_route can free the mbuf causing *m0 to become NULL */
6482 pf_route(m0, r, dir, ifp, s, &pd);
6489 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0,
6490 struct ether_header *eh, struct inpcb *inp)
6492 struct pfi_kif *kif;
6493 u_short action, reason = 0, log = 0;
6494 struct mbuf *m = *m0, *n = NULL;
6495 struct ip6_hdr *h = NULL;
6496 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr;
6497 struct pf_state *s = NULL;
6498 struct pf_ruleset *ruleset = NULL;
6500 int off, terminal = 0, dirndx;
6502 if (!pf_status.running)
6505 memset(&pd, 0, sizeof(pd));
6506 if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) {
6507 DPFPRINTF(PF_DEBUG_URGENT,
6508 ("pf_test6: pf_get_mtag returned NULL\n"));
6511 if (pd.pf_mtag->flags & PF_TAG_GENERATED)
6514 kif = (struct pfi_kif *)ifp->if_pf_kif;
6516 DPFPRINTF(PF_DEBUG_URGENT,
6517 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname));
6520 if (kif->pfik_flags & PFI_IFLAG_SKIP)
6524 if ((m->m_flags & M_PKTHDR) == 0)
6525 panic("non-M_PKTHDR is passed to pf_test6");
6526 #endif /* DIAGNOSTIC */
6528 if (m->m_pkthdr.len < (int)sizeof(*h)) {
6530 REASON_SET(&reason, PFRES_SHORT);
6535 /* We do IP header normalization and packet reassembly here */
6536 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) {
6541 h = mtod(m, struct ip6_hdr *);
6545 * we do not support jumbogram yet. if we keep going, zero ip6_plen
6546 * will do something bad, so drop the packet for now.
6548 if (htons(h->ip6_plen) == 0) {
6550 REASON_SET(&reason, PFRES_NORM); /*XXX*/
6555 pd.src = (struct pf_addr *)&h->ip6_src;
6556 pd.dst = (struct pf_addr *)&h->ip6_dst;
6557 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6);
6561 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
6564 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
6565 pd.proto = h->ip6_nxt;
6568 case IPPROTO_FRAGMENT:
6569 action = pf_test_fragment(&r, dir, kif, m, h,
6571 if (action == PF_DROP)
6572 REASON_SET(&reason, PFRES_FRAG);
6574 case IPPROTO_ROUTING: {
6575 struct ip6_rthdr rthdr;
6577 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL,
6579 DPFPRINTF(PF_DEBUG_MISC,
6580 ("pf: IPv6 short rthdr\n"));
6585 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) {
6586 DPFPRINTF(PF_DEBUG_MISC,
6587 ("pf: IPv6 rthdr0\n"));
6589 REASON_SET(&reason, PFRES_IPOPTIONS);
6596 case IPPROTO_HOPOPTS:
6597 case IPPROTO_DSTOPTS: {
6598 /* get next header and header length */
6599 struct ip6_ext opt6;
6601 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
6602 NULL, &reason, pd.af)) {
6603 DPFPRINTF(PF_DEBUG_MISC,
6604 ("pf: IPv6 short opt\n"));
6609 if (pd.proto == IPPROTO_AH)
6610 off += (opt6.ip6e_len + 2) * 4;
6612 off += (opt6.ip6e_len + 1) * 8;
6613 pd.proto = opt6.ip6e_nxt;
6614 /* goto the next header */
6621 } while (!terminal);
6623 /* if there's no routing header, use unmodified mbuf for checksumming */
6633 if (!pf_pull_hdr(m, off, &th, sizeof(th),
6634 &action, &reason, AF_INET6)) {
6635 log = action != PF_PASS;
6638 if (dir == PF_IN && pf_check_proto_cksum(n, off,
6639 ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)),
6640 IPPROTO_TCP, AF_INET6)) {
6642 REASON_SET(&reason, PFRES_PROTCKSUM);
6645 pd.p_len = pd.tot_len - off - (th.th_off << 2);
6646 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
6647 if (action == PF_DROP)
6649 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
6651 if (action == PF_PASS) {
6653 pfsync_update_state(s);
6654 #endif /* NPFSYNC */
6658 } else if (s == NULL)
6659 action = pf_test_tcp(&r, &s, dir, kif,
6660 m, off, h, &pd, &a, &ruleset, NULL, inp);
6668 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
6669 &action, &reason, AF_INET6)) {
6670 log = action != PF_PASS;
6673 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(n,
6674 off, ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)),
6675 IPPROTO_UDP, AF_INET6)) {
6677 REASON_SET(&reason, PFRES_PROTCKSUM);
6680 if (uh.uh_dport == 0 ||
6681 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
6682 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
6684 REASON_SET(&reason, PFRES_SHORT);
6687 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
6688 if (action == PF_PASS) {
6690 pfsync_update_state(s);
6691 #endif /* NPFSYNC */
6695 } else if (s == NULL)
6696 action = pf_test_udp(&r, &s, dir, kif,
6697 m, off, h, &pd, &a, &ruleset, NULL, inp);
6701 case IPPROTO_ICMPV6: {
6702 struct icmp6_hdr ih;
6705 if (!pf_pull_hdr(m, off, &ih, sizeof(ih),
6706 &action, &reason, AF_INET6)) {
6707 log = action != PF_PASS;
6710 if (dir == PF_IN && pf_check_proto_cksum(n, off,
6711 ntohs(h->ip6_plen) - (off - sizeof(struct ip6_hdr)),
6712 IPPROTO_ICMPV6, AF_INET6)) {
6714 REASON_SET(&reason, PFRES_PROTCKSUM);
6717 action = pf_test_state_icmp(&s, dir, kif,
6718 m, off, h, &pd, &reason);
6719 if (action == PF_PASS) {
6721 pfsync_update_state(s);
6722 #endif /* NPFSYNC */
6726 } else if (s == NULL)
6727 action = pf_test_icmp(&r, &s, dir, kif,
6728 m, off, h, &pd, &a, &ruleset, NULL);
6733 action = pf_test_state_other(&s, dir, kif, &pd);
6734 if (action == PF_PASS) {
6736 pfsync_update_state(s);
6737 #endif /* NPFSYNC */
6741 } else if (s == NULL)
6742 action = pf_test_other(&r, &s, dir, kif, m, off, h,
6743 &pd, &a, &ruleset, NULL);
6753 /* XXX handle IPv6 options, if not allowed. not implemented. */
6755 if ((s && s->tag) || r->rtableid)
6756 pf_tag_packet(m, pd.pf_mtag, s ? s->tag : 0, r->rtableid);
6759 if (action == PF_PASS && r->qid) {
6760 if (pd.tos & IPTOS_LOWDELAY)
6761 pd.pf_mtag->qid = r->pqid;
6763 pd.pf_mtag->qid = r->qid;
6764 /* add hints for ecn */
6765 pd.pf_mtag->af = AF_INET6;
6766 pd.pf_mtag->hdr = h;
6767 /* add connection hash for fairq */
6769 KKASSERT(s->hash != 0);
6770 pd.pf_mtag->flags |= PF_TAG_STATE_HASHED;
6771 pd.pf_mtag->state_hash = s->hash;
6776 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
6777 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
6778 (s->nat_rule.ptr->action == PF_RDR ||
6779 s->nat_rule.ptr->action == PF_BINAT) &&
6780 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6))
6781 pd.pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST;
6786 if (s != NULL && s->nat_rule.ptr != NULL &&
6787 s->nat_rule.ptr->log & PF_LOG_ALL)
6788 lr = s->nat_rule.ptr;
6791 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset,
6795 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6796 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;
6798 if (action == PF_PASS || r->action == PF_DROP) {
6799 dirndx = (dir == PF_OUT);
6800 r->packets[dirndx]++;
6801 r->bytes[dirndx] += pd.tot_len;
6803 a->packets[dirndx]++;
6804 a->bytes[dirndx] += pd.tot_len;
6807 if (s->nat_rule.ptr != NULL) {
6808 s->nat_rule.ptr->packets[dirndx]++;
6809 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6811 if (s->src_node != NULL) {
6812 s->src_node->packets[dirndx]++;
6813 s->src_node->bytes[dirndx] += pd.tot_len;
6815 if (s->nat_src_node != NULL) {
6816 s->nat_src_node->packets[dirndx]++;
6817 s->nat_src_node->bytes[dirndx] += pd.tot_len;
6819 dirndx = (dir == s->direction) ? 0 : 1;
6820 s->packets[dirndx]++;
6821 s->bytes[dirndx] += pd.tot_len;
6824 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6828 * XXX: we need to make sure that the addresses
6829 * passed to pfr_update_stats() are the same than
6830 * the addresses used during matching (pfr_match)
6832 if (r == &pf_default_rule) {
6834 x = (s == NULL || s->direction == dir) ?
6835 &pd.baddr : &pd.naddr;
6837 x = (s == NULL || s->direction == dir) ?
6838 &pd.naddr : &pd.baddr;
6840 if (x == &pd.baddr || s == NULL) {
6847 if (tr->src.addr.type == PF_ADDR_TABLE)
6848 pfr_update_stats(tr->src.addr.p.tbl, (s == NULL ||
6849 s->direction == dir) ? pd.src : pd.dst, pd.af,
6850 pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
6852 if (tr->dst.addr.type == PF_ADDR_TABLE)
6853 pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL ||
6854 s->direction == dir) ? pd.dst : pd.src, pd.af,
6855 pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
6860 if (action == PF_SYNPROXY_DROP) {
6865 /* pf_route6 can free the mbuf causing *m0 to become NULL */
6866 pf_route6(m0, r, dir, ifp, s, &pd);
6873 pf_check_congestion(struct ifqueue *ifq)