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 1.14 2007/05/23 08:57:10 dillon Exp $ */
7 * Copyright (c) 2004 The DragonFly Project. All rights reserved.
9 * Copyright (c) 2001 Daniel Hartmeier
10 * Copyright (c) 2002,2003 Henning Brauer
11 * All rights reserved.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
17 * - Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials provided
22 * with the distribution.
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
25 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
26 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
27 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
28 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
29 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
30 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
31 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
32 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
34 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
37 * Effort sponsored in part by the Defense Advanced Research Projects
38 * Agency (DARPA) and Air Force Research Laboratory, Air Force
39 * Materiel Command, USAF, under agreement number F30602-01-2-0537.
44 #include "opt_inet6.h"
45 #include "use_pfsync.h"
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/malloc.h>
51 #include <sys/filio.h>
52 #include <sys/socket.h>
53 #include <sys/socketvar.h>
54 #include <sys/kernel.h>
56 #include <sys/sysctl.h>
57 #include <sys/endian.h>
58 #include <vm/vm_zone.h>
60 #include <machine/inttypes.h>
63 #include <net/if_types.h>
65 #include <net/netisr.h>
66 #include <net/route.h>
68 #include <netinet/in.h>
69 #include <netinet/in_var.h>
70 #include <netinet/in_systm.h>
71 #include <netinet/ip.h>
72 #include <netinet/ip_var.h>
73 #include <netinet/tcp.h>
74 #include <netinet/tcp_seq.h>
75 #include <netinet/udp.h>
76 #include <netinet/ip_icmp.h>
77 #include <netinet/in_pcb.h>
78 #include <netinet/tcp_timer.h>
79 #include <netinet/tcp_var.h>
80 #include <netinet/udp_var.h>
81 #include <netinet/icmp_var.h>
83 #include <net/pf/pfvar.h>
84 #include <net/pf/if_pflog.h>
87 #include <net/pf/if_pfsync.h>
88 #endif /* NPFSYNC > 0 */
91 #include <netinet/ip6.h>
92 #include <netinet/in_pcb.h>
93 #include <netinet/icmp6.h>
94 #include <netinet6/nd6.h>
95 #include <netinet6/ip6_var.h>
96 #include <netinet6/in6_pcb.h>
99 #include <sys/in_cksum.h>
100 #include <sys/ucred.h>
101 #include <machine/limits.h>
102 #include <sys/msgport2.h>
103 #include <net/netmsg2.h>
105 extern int ip_optcopy(struct ip *, struct ip *);
107 #define DPFPRINTF(n, x) if (pf_status.debug >= (n)) kprintf x
113 struct pf_anchorqueue pf_anchors;
114 struct pf_ruleset pf_main_ruleset;
115 struct pf_altqqueue pf_altqs[2];
116 struct pf_palist pf_pabuf;
117 struct pf_altqqueue *pf_altqs_active;
118 struct pf_altqqueue *pf_altqs_inactive;
119 struct pf_status pf_status;
121 u_int32_t ticket_altqs_active;
122 u_int32_t ticket_altqs_inactive;
123 int altqs_inactive_open;
124 u_int32_t ticket_pabuf;
126 struct callout pf_expire_to; /* expire timeout */
128 vm_zone_t pf_src_tree_pl, pf_rule_pl;
129 vm_zone_t pf_state_pl, pf_altq_pl, pf_pooladdr_pl;
131 void pf_print_host(struct pf_addr *, u_int16_t, u_int8_t);
132 void pf_print_state(struct pf_state *);
133 void pf_print_flags(u_int8_t);
135 u_int16_t pf_cksum_fixup(u_int16_t, u_int16_t, u_int16_t,
137 void pf_change_ap(struct pf_addr *, u_int16_t *,
138 u_int16_t *, u_int16_t *, struct pf_addr *,
139 u_int16_t, u_int8_t, sa_family_t);
141 void pf_change_a6(struct pf_addr *, u_int16_t *,
142 struct pf_addr *, u_int8_t);
144 void pf_change_icmp(struct pf_addr *, u_int16_t *,
145 struct pf_addr *, struct pf_addr *, u_int16_t,
146 u_int16_t *, u_int16_t *, u_int16_t *,
147 u_int16_t *, u_int8_t, sa_family_t);
148 void pf_send_tcp(const struct pf_rule *, sa_family_t,
149 const struct pf_addr *, const struct pf_addr *,
150 u_int16_t, u_int16_t, u_int32_t, u_int32_t,
151 u_int8_t, u_int16_t, u_int16_t, u_int8_t);
152 void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
153 sa_family_t, struct pf_rule *);
154 struct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *,
155 int, int, struct pfi_kif *,
156 struct pf_addr *, u_int16_t, struct pf_addr *,
158 struct pf_rule *pf_get_translation(struct pf_pdesc *, struct mbuf *,
159 int, int, struct pfi_kif *, struct pf_src_node **,
160 struct pf_addr *, u_int16_t,
161 struct pf_addr *, u_int16_t,
162 struct pf_addr *, u_int16_t *);
163 int pf_test_tcp(struct pf_rule **, struct pf_state **,
164 int, struct pfi_kif *, struct mbuf *, int,
165 void *, struct pf_pdesc *, struct pf_rule **,
166 struct pf_ruleset **);
167 int pf_test_udp(struct pf_rule **, struct pf_state **,
168 int, struct pfi_kif *, struct mbuf *, int,
169 void *, struct pf_pdesc *, struct pf_rule **,
170 struct pf_ruleset **);
171 int pf_test_icmp(struct pf_rule **, struct pf_state **,
172 int, struct pfi_kif *, struct mbuf *, int,
173 void *, struct pf_pdesc *, struct pf_rule **,
174 struct pf_ruleset **);
175 int pf_test_other(struct pf_rule **, struct pf_state **,
176 int, struct pfi_kif *, struct mbuf *, int, void *,
177 struct pf_pdesc *, struct pf_rule **,
178 struct pf_ruleset **);
179 int pf_test_fragment(struct pf_rule **, int,
180 struct pfi_kif *, struct mbuf *, void *,
181 struct pf_pdesc *, struct pf_rule **,
182 struct pf_ruleset **);
183 int pf_test_state_tcp(struct pf_state **, int,
184 struct pfi_kif *, struct mbuf *, int,
185 void *, struct pf_pdesc *, u_short *);
186 int pf_test_state_udp(struct pf_state **, int,
187 struct pfi_kif *, struct mbuf *, int,
188 void *, struct pf_pdesc *);
189 int pf_test_state_icmp(struct pf_state **, int,
190 struct pfi_kif *, struct mbuf *, int,
191 void *, struct pf_pdesc *);
192 int pf_test_state_other(struct pf_state **, int,
193 struct pfi_kif *, struct pf_pdesc *);
194 static int pf_match_tag(struct mbuf *, struct pf_rule *,
195 struct pf_rule *, int *);
196 void pf_hash(struct pf_addr *, struct pf_addr *,
197 struct pf_poolhashkey *, sa_family_t);
198 int pf_map_addr(u_int8_t, struct pf_rule *,
199 struct pf_addr *, struct pf_addr *,
200 struct pf_addr *, struct pf_src_node **);
201 int pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *,
202 struct pf_addr *, struct pf_addr *, u_int16_t,
203 struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t,
204 struct pf_src_node **);
205 void pf_route(struct mbuf **, struct pf_rule *, int,
206 struct ifnet *, struct pf_state *);
207 void pf_route6(struct mbuf **, struct pf_rule *, int,
208 struct ifnet *, struct pf_state *);
209 int pf_socket_lookup(uid_t *, gid_t *,
210 int, struct pf_pdesc *);
211 u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t,
213 u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t,
215 u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t,
217 void pf_set_rt_ifp(struct pf_state *,
219 int pf_check_proto_cksum(struct mbuf *, int, int,
220 u_int8_t, sa_family_t);
221 int pf_addr_wrap_neq(struct pf_addr_wrap *,
222 struct pf_addr_wrap *);
223 struct pf_state *pf_find_state_recurse(struct pfi_kif *,
224 struct pf_state *, u_int8_t);
226 struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX];
228 #define STATE_LOOKUP() \
230 if (direction == PF_IN) \
231 *state = pf_find_state_recurse( \
232 kif, &key, PF_EXT_GWY); \
234 *state = pf_find_state_recurse( \
235 kif, &key, PF_LAN_EXT); \
236 if (*state == NULL) \
238 if (direction == PF_OUT && \
239 (((*state)->rule.ptr->rt == PF_ROUTETO && \
240 (*state)->rule.ptr->direction == PF_OUT) || \
241 ((*state)->rule.ptr->rt == PF_REPLYTO && \
242 (*state)->rule.ptr->direction == PF_IN)) && \
243 (*state)->rt_kif != NULL && \
244 (*state)->rt_kif != kif) \
248 #define STATE_TRANSLATE(s) \
249 (s)->lan.addr.addr32[0] != (s)->gwy.addr.addr32[0] || \
250 ((s)->af == AF_INET6 && \
251 ((s)->lan.addr.addr32[1] != (s)->gwy.addr.addr32[1] || \
252 (s)->lan.addr.addr32[2] != (s)->gwy.addr.addr32[2] || \
253 (s)->lan.addr.addr32[3] != (s)->gwy.addr.addr32[3])) || \
254 (s)->lan.port != (s)->gwy.port
256 #define BOUND_IFACE(r, k) (((r)->rule_flag & PFRULE_IFBOUND) ? (k) : \
257 ((r)->rule_flag & PFRULE_GRBOUND) ? (k)->pfik_parent : \
258 (k)->pfik_parent->pfik_parent)
260 static int pf_src_compare(struct pf_src_node *, struct pf_src_node *);
261 static int pf_state_compare_lan_ext(struct pf_state *,
263 static int pf_state_compare_ext_gwy(struct pf_state *,
265 static int pf_state_compare_id(struct pf_state *,
268 struct pf_src_tree tree_src_tracking;
270 struct pf_state_tree_id tree_id;
271 struct pf_state_queue state_updates;
273 RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare);
274 RB_GENERATE(pf_state_tree_lan_ext, pf_state,
275 u.s.entry_lan_ext, pf_state_compare_lan_ext);
276 RB_GENERATE(pf_state_tree_ext_gwy, pf_state,
277 u.s.entry_ext_gwy, pf_state_compare_ext_gwy);
278 RB_GENERATE(pf_state_tree_id, pf_state,
279 u.s.entry_id, pf_state_compare_id);
282 pf_src_compare(struct pf_src_node *a, struct pf_src_node *b)
286 if (a->rule.ptr > b->rule.ptr)
288 if (a->rule.ptr < b->rule.ptr)
290 if ((diff = a->af - b->af) != 0)
295 if (a->addr.addr32[0] > b->addr.addr32[0])
297 if (a->addr.addr32[0] < b->addr.addr32[0])
303 if (a->addr.addr32[3] > b->addr.addr32[3])
305 if (a->addr.addr32[3] < b->addr.addr32[3])
307 if (a->addr.addr32[2] > b->addr.addr32[2])
309 if (a->addr.addr32[2] < b->addr.addr32[2])
311 if (a->addr.addr32[1] > b->addr.addr32[1])
313 if (a->addr.addr32[1] < b->addr.addr32[1])
315 if (a->addr.addr32[0] > b->addr.addr32[0])
317 if (a->addr.addr32[0] < b->addr.addr32[0])
326 pf_state_compare_lan_ext(struct pf_state *a, struct pf_state *b)
330 if ((diff = a->proto - b->proto) != 0)
332 if ((diff = a->af - b->af) != 0)
337 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0])
339 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0])
341 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
343 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
349 if (a->lan.addr.addr32[3] > b->lan.addr.addr32[3])
351 if (a->lan.addr.addr32[3] < b->lan.addr.addr32[3])
353 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3])
355 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3])
357 if (a->lan.addr.addr32[2] > b->lan.addr.addr32[2])
359 if (a->lan.addr.addr32[2] < b->lan.addr.addr32[2])
361 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2])
363 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2])
365 if (a->lan.addr.addr32[1] > b->lan.addr.addr32[1])
367 if (a->lan.addr.addr32[1] < b->lan.addr.addr32[1])
369 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1])
371 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1])
373 if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0])
375 if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0])
377 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
379 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
385 if ((diff = a->lan.port - b->lan.port) != 0)
387 if ((diff = a->ext.port - b->ext.port) != 0)
394 pf_state_compare_ext_gwy(struct pf_state *a, struct pf_state *b)
398 if ((diff = a->proto - b->proto) != 0)
400 if ((diff = a->af - b->af) != 0)
405 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
407 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
409 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0])
411 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0])
417 if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3])
419 if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3])
421 if (a->gwy.addr.addr32[3] > b->gwy.addr.addr32[3])
423 if (a->gwy.addr.addr32[3] < b->gwy.addr.addr32[3])
425 if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2])
427 if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2])
429 if (a->gwy.addr.addr32[2] > b->gwy.addr.addr32[2])
431 if (a->gwy.addr.addr32[2] < b->gwy.addr.addr32[2])
433 if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1])
435 if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1])
437 if (a->gwy.addr.addr32[1] > b->gwy.addr.addr32[1])
439 if (a->gwy.addr.addr32[1] < b->gwy.addr.addr32[1])
441 if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
443 if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
445 if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0])
447 if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0])
453 if ((diff = a->ext.port - b->ext.port) != 0)
455 if ((diff = a->gwy.port - b->gwy.port) != 0)
462 pf_state_compare_id(struct pf_state *a, struct pf_state *b)
468 if (a->creatorid > b->creatorid)
470 if (a->creatorid < b->creatorid)
478 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
483 dst->addr32[0] = src->addr32[0];
487 dst->addr32[0] = src->addr32[0];
488 dst->addr32[1] = src->addr32[1];
489 dst->addr32[2] = src->addr32[2];
490 dst->addr32[3] = src->addr32[3];
497 pf_find_state_byid(struct pf_state *key)
499 pf_status.fcounters[FCNT_STATE_SEARCH]++;
500 return (RB_FIND(pf_state_tree_id, &tree_id, key));
504 pf_find_state_recurse(struct pfi_kif *kif, struct pf_state *key, u_int8_t tree)
508 pf_status.fcounters[FCNT_STATE_SEARCH]++;
512 for (; kif != NULL; kif = kif->pfik_parent) {
513 s = RB_FIND(pf_state_tree_lan_ext,
514 &kif->pfik_lan_ext, key);
520 for (; kif != NULL; kif = kif->pfik_parent) {
521 s = RB_FIND(pf_state_tree_ext_gwy,
522 &kif->pfik_ext_gwy, key);
528 panic("pf_find_state_recurse");
533 pf_find_state_all(struct pf_state *key, u_int8_t tree, int *more)
535 struct pf_state *s, *ss = NULL;
538 pf_status.fcounters[FCNT_STATE_SEARCH]++;
542 TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) {
543 s = RB_FIND(pf_state_tree_lan_ext,
544 &kif->pfik_lan_ext, key);
554 TAILQ_FOREACH(kif, &pfi_statehead, pfik_w_states) {
555 s = RB_FIND(pf_state_tree_ext_gwy,
556 &kif->pfik_ext_gwy, key);
566 panic("pf_find_state_all");
571 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
572 struct pf_addr *src, sa_family_t af)
574 struct pf_src_node k;
578 PF_ACPY(&k.addr, src, af);
579 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
580 rule->rpool.opts & PF_POOL_STICKYADDR)
584 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
585 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
588 if (!rule->max_src_nodes ||
589 rule->src_nodes < rule->max_src_nodes)
590 (*sn) = pool_get(&pf_src_tree_pl, PR_NOWAIT);
593 bzero(*sn, sizeof(struct pf_src_node));
595 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
596 rule->rpool.opts & PF_POOL_STICKYADDR)
597 (*sn)->rule.ptr = rule;
599 (*sn)->rule.ptr = NULL;
600 PF_ACPY(&(*sn)->addr, src, af);
601 if (RB_INSERT(pf_src_tree,
602 &tree_src_tracking, *sn) != NULL) {
603 if (pf_status.debug >= PF_DEBUG_MISC) {
604 kprintf("pf: src_tree insert failed: ");
605 pf_print_host(&(*sn)->addr, 0, af);
608 pool_put(&pf_src_tree_pl, *sn);
611 (*sn)->creation = time_second;
612 (*sn)->ruletype = rule->action;
613 if ((*sn)->rule.ptr != NULL)
614 (*sn)->rule.ptr->src_nodes++;
615 pf_status.scounters[SCNT_SRC_NODE_INSERT]++;
616 pf_status.src_nodes++;
618 if (rule->max_src_states &&
619 (*sn)->states >= rule->max_src_states)
626 pf_insert_state(struct pfi_kif *kif, struct pf_state *state)
628 /* Thou MUST NOT insert multiple duplicate keys */
629 state->u.s.kif = kif;
630 if (RB_INSERT(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state)) {
631 if (pf_status.debug >= PF_DEBUG_MISC) {
632 kprintf("pf: state insert failed: tree_lan_ext");
634 pf_print_host(&state->lan.addr, state->lan.port,
637 pf_print_host(&state->gwy.addr, state->gwy.port,
640 pf_print_host(&state->ext.addr, state->ext.port,
642 if (state->sync_flags & PFSTATE_FROMSYNC)
643 kprintf(" (from sync)");
649 if (RB_INSERT(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state)) {
650 if (pf_status.debug >= PF_DEBUG_MISC) {
651 kprintf("pf: state insert failed: tree_ext_gwy");
653 pf_print_host(&state->lan.addr, state->lan.port,
656 pf_print_host(&state->gwy.addr, state->gwy.port,
659 pf_print_host(&state->ext.addr, state->ext.port,
661 if (state->sync_flags & PFSTATE_FROMSYNC)
662 kprintf(" (from sync)");
665 RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state);
669 if (state->id == 0 && state->creatorid == 0) {
670 state->id = htobe64(pf_status.stateid++);
671 state->creatorid = pf_status.hostid;
673 if (RB_INSERT(pf_state_tree_id, &tree_id, state) != NULL) {
674 if (pf_status.debug >= PF_DEBUG_MISC) {
675 kprintf("pf: state insert failed: "
676 "id: %016" PRIx64 " creatorid: %08" PRIx32,
677 be64toh(state->id), ntohl(state->creatorid));
678 if (state->sync_flags & PFSTATE_FROMSYNC)
679 kprintf(" (from sync)");
682 RB_REMOVE(pf_state_tree_lan_ext, &kif->pfik_lan_ext, state);
683 RB_REMOVE(pf_state_tree_ext_gwy, &kif->pfik_ext_gwy, state);
686 TAILQ_INSERT_HEAD(&state_updates, state, u.s.entry_updates);
688 pf_status.fcounters[FCNT_STATE_INSERT]++;
690 pfi_attach_state(kif);
692 pfsync_insert_state(state);
698 pf_purge_timeout(void *arg)
700 struct callout *to = arg;
703 pf_purge_expired_states();
704 pf_purge_expired_fragments();
705 pf_purge_expired_src_nodes();
708 callout_reset(to, pf_default_rule.timeout[PFTM_INTERVAL] * hz,
709 pf_purge_timeout, to);
713 pf_state_expires(const struct pf_state *state)
720 /* handle all PFTM_* > PFTM_MAX here */
721 if (state->timeout == PFTM_PURGE)
722 return (time_second);
723 if (state->timeout == PFTM_UNTIL_PACKET)
725 KASSERT((state->timeout < PFTM_MAX),
726 ("pf_state_expires: timeout > PFTM_MAX"));
727 timeout = state->rule.ptr->timeout[state->timeout];
729 timeout = pf_default_rule.timeout[state->timeout];
730 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
732 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
733 states = state->rule.ptr->states;
735 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START];
736 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END];
737 states = pf_status.states;
739 if (end && states > start && start < end) {
741 return (state->expire + timeout * (end - states) /
744 return (time_second);
746 return (state->expire + timeout);
750 pf_purge_expired_src_nodes(void)
752 struct pf_src_node *cur, *next;
754 for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) {
755 next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur);
757 if (cur->states <= 0 && cur->expire <= time_second) {
758 if (cur->rule.ptr != NULL) {
759 cur->rule.ptr->src_nodes--;
760 if (cur->rule.ptr->states <= 0 &&
761 cur->rule.ptr->max_src_nodes <= 0)
762 pf_rm_rule(NULL, cur->rule.ptr);
764 RB_REMOVE(pf_src_tree, &tree_src_tracking, cur);
765 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
766 pf_status.src_nodes--;
767 pool_put(&pf_src_tree_pl, cur);
773 pf_src_tree_remove_state(struct pf_state *s)
777 if (s->src_node != NULL) {
778 if (--s->src_node->states <= 0) {
779 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
782 pf_default_rule.timeout[PFTM_SRC_NODE];
783 s->src_node->expire = time_second + timeout;
786 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
787 if (--s->nat_src_node->states <= 0) {
788 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
791 pf_default_rule.timeout[PFTM_SRC_NODE];
792 s->nat_src_node->expire = time_second + timeout;
795 s->src_node = s->nat_src_node = NULL;
799 pf_purge_expired_states_callback(struct pf_state *cur, void *data __unused)
801 if (pf_state_expires(cur) <= time_second) {
802 RB_REMOVE(pf_state_tree_ext_gwy,
803 &cur->u.s.kif->pfik_ext_gwy, cur);
804 RB_REMOVE(pf_state_tree_lan_ext,
805 &cur->u.s.kif->pfik_lan_ext, cur);
806 RB_REMOVE(pf_state_tree_id, &tree_id, cur);
807 if (cur->src.state == PF_TCPS_PROXY_DST) {
808 pf_send_tcp(cur->rule.ptr, cur->af,
809 &cur->ext.addr, &cur->lan.addr,
810 cur->ext.port, cur->lan.port,
811 cur->src.seqhi, cur->src.seqlo + 1, 0,
812 TH_RST|TH_ACK, 0, 0);
815 pfsync_delete_state(cur);
817 pf_src_tree_remove_state(cur);
818 if (--cur->rule.ptr->states <= 0 &&
819 cur->rule.ptr->src_nodes <= 0)
820 pf_rm_rule(NULL, cur->rule.ptr);
821 if (cur->nat_rule.ptr != NULL)
822 if (--cur->nat_rule.ptr->states <= 0 &&
823 cur->nat_rule.ptr->src_nodes <= 0)
824 pf_rm_rule(NULL, cur->nat_rule.ptr);
825 if (cur->anchor.ptr != NULL)
826 if (--cur->anchor.ptr->states <= 0)
827 pf_rm_rule(NULL, cur->anchor.ptr);
828 pf_normalize_tcp_cleanup(cur);
829 pfi_detach_state(cur->u.s.kif);
830 TAILQ_REMOVE(&state_updates, cur, u.s.entry_updates);
831 pool_put(&pf_state_pl, cur);
832 pf_status.fcounters[FCNT_STATE_REMOVALS]++;
839 pf_purge_expired_states(void)
841 RB_SCAN(pf_state_tree_id, &tree_id, NULL,
842 pf_purge_expired_states_callback, NULL);
847 pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw)
849 if (aw->type != PF_ADDR_TABLE)
851 if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL)
857 pf_tbladdr_remove(struct pf_addr_wrap *aw)
859 if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL)
861 pfr_detach_table(aw->p.tbl);
866 pf_tbladdr_copyout(struct pf_addr_wrap *aw)
868 struct pfr_ktable *kt = aw->p.tbl;
870 if (aw->type != PF_ADDR_TABLE || kt == NULL)
872 if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL)
875 aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ?
880 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
885 u_int32_t a = ntohl(addr->addr32[0]);
886 kprintf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
898 u_int8_t i, curstart = 255, curend = 0,
899 maxstart = 0, maxend = 0;
900 for (i = 0; i < 8; i++) {
901 if (!addr->addr16[i]) {
908 if ((curend - curstart) >
909 (maxend - maxstart)) {
917 for (i = 0; i < 8; i++) {
918 if (i >= maxstart && i <= maxend) {
927 b = ntohs(addr->addr16[i]);
944 pf_print_state(struct pf_state *s)
960 kprintf("%u ", s->proto);
963 pf_print_host(&s->lan.addr, s->lan.port, s->af);
965 pf_print_host(&s->gwy.addr, s->gwy.port, s->af);
967 pf_print_host(&s->ext.addr, s->ext.port, s->af);
968 kprintf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo,
969 s->src.seqhi, s->src.max_win, s->src.seqdiff);
970 if (s->src.wscale && s->dst.wscale)
971 kprintf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK);
973 kprintf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo,
974 s->dst.seqhi, s->dst.max_win, s->dst.seqdiff);
975 if (s->src.wscale && s->dst.wscale)
976 kprintf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK);
978 kprintf(" %u:%u", s->src.state, s->dst.state);
982 pf_print_flags(u_int8_t f)
1004 #define PF_SET_SKIP_STEPS(i) \
1006 while (head[i] != cur) { \
1007 head[i]->skip[i].ptr = cur; \
1008 head[i] = TAILQ_NEXT(head[i], entries); \
1013 pf_calc_skip_steps(struct pf_rulequeue *rules)
1015 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
1018 cur = TAILQ_FIRST(rules);
1020 for (i = 0; i < PF_SKIP_COUNT; ++i)
1022 while (cur != NULL) {
1024 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
1025 PF_SET_SKIP_STEPS(PF_SKIP_IFP);
1026 if (cur->direction != prev->direction)
1027 PF_SET_SKIP_STEPS(PF_SKIP_DIR);
1028 if (cur->af != prev->af)
1029 PF_SET_SKIP_STEPS(PF_SKIP_AF);
1030 if (cur->proto != prev->proto)
1031 PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
1032 if (cur->src.not != prev->src.not ||
1033 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
1034 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
1035 if (cur->src.port[0] != prev->src.port[0] ||
1036 cur->src.port[1] != prev->src.port[1] ||
1037 cur->src.port_op != prev->src.port_op)
1038 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
1039 if (cur->dst.not != prev->dst.not ||
1040 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
1041 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
1042 if (cur->dst.port[0] != prev->dst.port[0] ||
1043 cur->dst.port[1] != prev->dst.port[1] ||
1044 cur->dst.port_op != prev->dst.port_op)
1045 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
1048 cur = TAILQ_NEXT(cur, entries);
1050 for (i = 0; i < PF_SKIP_COUNT; ++i)
1051 PF_SET_SKIP_STEPS(i);
1055 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
1057 if (aw1->type != aw2->type)
1059 switch (aw1->type) {
1060 case PF_ADDR_ADDRMASK:
1061 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0))
1063 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0))
1066 case PF_ADDR_DYNIFTL:
1067 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
1068 case PF_ADDR_NOROUTE:
1071 return (aw1->p.tbl != aw2->p.tbl);
1073 kprintf("invalid address type: %d\n", aw1->type);
1079 pf_update_anchor_rules(void)
1081 struct pf_rule *rule;
1084 for (i = 0; i < PF_RULESET_MAX; ++i)
1085 TAILQ_FOREACH(rule, pf_main_ruleset.rules[i].active.ptr,
1087 if (rule->anchorname[0])
1088 rule->anchor = pf_find_anchor(rule->anchorname);
1090 rule->anchor = NULL;
1094 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
1100 l = cksum + old - new;
1101 l = (l >> 16) + (l & 65535);
1109 pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc,
1110 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af)
1115 PF_ACPY(&ao, a, af);
1123 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1124 ao.addr16[0], an->addr16[0], 0),
1125 ao.addr16[1], an->addr16[1], 0);
1127 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1128 ao.addr16[0], an->addr16[0], u),
1129 ao.addr16[1], an->addr16[1], u),
1135 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1136 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1137 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1138 ao.addr16[0], an->addr16[0], u),
1139 ao.addr16[1], an->addr16[1], u),
1140 ao.addr16[2], an->addr16[2], u),
1141 ao.addr16[3], an->addr16[3], u),
1142 ao.addr16[4], an->addr16[4], u),
1143 ao.addr16[5], an->addr16[5], u),
1144 ao.addr16[6], an->addr16[6], u),
1145 ao.addr16[7], an->addr16[7], u),
1153 /* Changes a u_int32_t. Uses a void * so there are no align restrictions */
1155 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
1159 memcpy(&ao, a, sizeof(ao));
1160 memcpy(a, &an, sizeof(u_int32_t));
1161 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
1162 ao % 65536, an % 65536, u);
1167 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
1171 PF_ACPY(&ao, a, AF_INET6);
1172 PF_ACPY(a, an, AF_INET6);
1174 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1175 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1176 pf_cksum_fixup(pf_cksum_fixup(*c,
1177 ao.addr16[0], an->addr16[0], u),
1178 ao.addr16[1], an->addr16[1], u),
1179 ao.addr16[2], an->addr16[2], u),
1180 ao.addr16[3], an->addr16[3], u),
1181 ao.addr16[4], an->addr16[4], u),
1182 ao.addr16[5], an->addr16[5], u),
1183 ao.addr16[6], an->addr16[6], u),
1184 ao.addr16[7], an->addr16[7], u);
1189 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
1190 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
1191 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
1193 struct pf_addr oia, ooa;
1195 PF_ACPY(&oia, ia, af);
1196 PF_ACPY(&ooa, oa, af);
1198 /* Change inner protocol port, fix inner protocol checksum. */
1200 u_int16_t oip = *ip;
1207 *pc = pf_cksum_fixup(*pc, oip, *ip, u);
1208 *ic = pf_cksum_fixup(*ic, oip, *ip, 0);
1210 *ic = pf_cksum_fixup(*ic, opc, *pc, 0);
1212 /* Change inner ip address, fix inner ip and icmp checksums. */
1213 PF_ACPY(ia, na, af);
1217 u_int32_t oh2c = *h2c;
1219 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
1220 oia.addr16[0], ia->addr16[0], 0),
1221 oia.addr16[1], ia->addr16[1], 0);
1222 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1223 oia.addr16[0], ia->addr16[0], 0),
1224 oia.addr16[1], ia->addr16[1], 0);
1225 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
1231 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1232 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1233 pf_cksum_fixup(pf_cksum_fixup(*ic,
1234 oia.addr16[0], ia->addr16[0], u),
1235 oia.addr16[1], ia->addr16[1], u),
1236 oia.addr16[2], ia->addr16[2], u),
1237 oia.addr16[3], ia->addr16[3], u),
1238 oia.addr16[4], ia->addr16[4], u),
1239 oia.addr16[5], ia->addr16[5], u),
1240 oia.addr16[6], ia->addr16[6], u),
1241 oia.addr16[7], ia->addr16[7], u);
1245 /* Change outer ip address, fix outer ip or icmpv6 checksum. */
1246 PF_ACPY(oa, na, af);
1250 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
1251 ooa.addr16[0], oa->addr16[0], 0),
1252 ooa.addr16[1], oa->addr16[1], 0);
1257 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1258 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1259 pf_cksum_fixup(pf_cksum_fixup(*ic,
1260 ooa.addr16[0], oa->addr16[0], u),
1261 ooa.addr16[1], oa->addr16[1], u),
1262 ooa.addr16[2], oa->addr16[2], u),
1263 ooa.addr16[3], oa->addr16[3], u),
1264 ooa.addr16[4], oa->addr16[4], u),
1265 ooa.addr16[5], oa->addr16[5], u),
1266 ooa.addr16[6], oa->addr16[6], u),
1267 ooa.addr16[7], oa->addr16[7], u);
1274 pf_send_tcp(const struct pf_rule *r, sa_family_t af,
1275 const struct pf_addr *saddr, const struct pf_addr *daddr,
1276 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
1277 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl)
1282 struct ip *h = NULL;
1285 struct ip6_hdr *h6 = NULL;
1287 struct tcphdr *th = NULL;
1290 /* maximum segment size tcp option */
1291 tlen = sizeof(struct tcphdr);
1298 len = sizeof(struct ip) + tlen;
1303 len = sizeof(struct ip6_hdr) + tlen;
1308 /* create outgoing mbuf */
1309 m = m_gethdr(MB_DONTWAIT, MT_HEADER);
1312 m->m_pkthdr.fw_flags = PF_MBUF_GENERATED;
1314 if (r != NULL && r->qid) {
1315 m->m_pkthdr.fw_flags |= ALTQ_MBUF_TAGGED;
1316 m->m_pkthdr.altq_qid = r->qid;
1317 m->m_pkthdr.ecn_af = af;
1318 m->m_pkthdr.header = mtod(m, struct ip *);
1321 m->m_data += max_linkhdr;
1322 m->m_pkthdr.len = m->m_len = len;
1323 m->m_pkthdr.rcvif = NULL;
1324 bzero(m->m_data, len);
1328 h = mtod(m, struct ip *);
1330 /* IP header fields included in the TCP checksum */
1331 h->ip_p = IPPROTO_TCP;
1333 h->ip_src.s_addr = saddr->v4.s_addr;
1334 h->ip_dst.s_addr = daddr->v4.s_addr;
1336 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
1341 h6 = mtod(m, struct ip6_hdr *);
1343 /* IP header fields included in the TCP checksum */
1344 h6->ip6_nxt = IPPROTO_TCP;
1345 h6->ip6_plen = htons(tlen);
1346 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
1347 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
1349 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
1355 th->th_sport = sport;
1356 th->th_dport = dport;
1357 th->th_seq = htonl(seq);
1358 th->th_ack = htonl(ack);
1359 th->th_off = tlen >> 2;
1360 th->th_flags = flags;
1361 th->th_win = htons(win);
1364 opt = (char *)(th + 1);
1365 opt[0] = TCPOPT_MAXSEG;
1368 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
1375 th->th_sum = in_cksum(m, len);
1377 /* Finish the IP header */
1379 h->ip_hl = sizeof(*h) >> 2;
1380 h->ip_tos = IPTOS_LOWDELAY;
1382 h->ip_off = path_mtu_discovery ? IP_DF : 0;
1383 h->ip_ttl = ttl ? ttl : ip_defttl;
1385 ip_output(m, (void *)NULL, (void *)NULL, 0, (void *)NULL,
1392 th->th_sum = in6_cksum(m, IPPROTO_TCP,
1393 sizeof(struct ip6_hdr), tlen);
1395 h6->ip6_vfc |= IPV6_VERSION;
1396 h6->ip6_hlim = IPV6_DEFHLIM;
1398 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
1405 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
1410 m0 = m_copypacket(m, MB_DONTWAIT);
1413 m0->m_pkthdr.fw_flags |= PF_MBUF_GENERATED;
1417 m->m_pkthdr.fw_flags |= ALTQ_MBUF_TAGGED;
1418 m->m_pkthdr.altq_qid = r->qid;
1419 m->m_pkthdr.ecn_af = af;
1420 m->m_pkthdr.header = mtod(m0, struct ip *);
1427 icmp_error(m0, type, code, 0, 0);
1432 icmp6_error(m0, type, code, 0);
1439 * Return 1 if the addresses a and b match (with mask m), otherwise return 0.
1440 * If n is 0, they match if they are equal. If n is != 0, they match if they
1444 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
1445 struct pf_addr *b, sa_family_t af)
1452 if ((a->addr32[0] & m->addr32[0]) ==
1453 (b->addr32[0] & m->addr32[0]))
1459 if (((a->addr32[0] & m->addr32[0]) ==
1460 (b->addr32[0] & m->addr32[0])) &&
1461 ((a->addr32[1] & m->addr32[1]) ==
1462 (b->addr32[1] & m->addr32[1])) &&
1463 ((a->addr32[2] & m->addr32[2]) ==
1464 (b->addr32[2] & m->addr32[2])) &&
1465 ((a->addr32[3] & m->addr32[3]) ==
1466 (b->addr32[3] & m->addr32[3])))
1485 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
1489 return ((p > a1) && (p < a2));
1491 return ((p < a1) || (p > a2));
1493 return ((p >= a1) && (p <= a2));
1507 return (0); /* never reached */
1511 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
1516 return (pf_match(op, a1, a2, p));
1520 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
1522 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
1524 return (pf_match(op, a1, a2, u));
1528 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
1530 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
1532 return (pf_match(op, a1, a2, g));
1536 pf_match_tag(struct mbuf *m, struct pf_rule *r, struct pf_rule *nat_rule,
1539 if (*tag == -1) { /* find mbuf tag */
1540 if (nat_rule != NULL && nat_rule->tag)
1541 *tag = nat_rule->tag;
1542 else if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED)
1543 *tag = m->m_pkthdr.pf_tag;
1548 return ((!r->match_tag_not && r->match_tag == *tag) ||
1549 (r->match_tag_not && r->match_tag != *tag));
1553 pf_tag_packet(struct mbuf *m, int tag)
1558 m->m_pkthdr.fw_flags |= PF_MBUF_TAGGED;
1559 m->m_pkthdr.pf_tag = tag;
1562 #define PF_STEP_INTO_ANCHOR(r, a, s, n) \
1564 if ((r) == NULL || (r)->anchor == NULL || \
1565 (s) != NULL || (a) != NULL) \
1566 panic("PF_STEP_INTO_ANCHOR"); \
1568 (s) = TAILQ_FIRST(&(r)->anchor->rulesets); \
1570 while ((s) != NULL && ((r) = \
1571 TAILQ_FIRST((s)->rules[n].active.ptr)) == NULL) \
1572 (s) = TAILQ_NEXT((s), entries); \
1573 if ((r) == NULL) { \
1574 (r) = TAILQ_NEXT((a), entries); \
1579 #define PF_STEP_OUT_OF_ANCHOR(r, a, s, n) \
1581 if ((r) != NULL || (a) == NULL || (s) == NULL) \
1582 panic("PF_STEP_OUT_OF_ANCHOR"); \
1583 (s) = TAILQ_NEXT((s), entries); \
1584 while ((s) != NULL && ((r) = \
1585 TAILQ_FIRST((s)->rules[n].active.ptr)) == NULL) \
1586 (s) = TAILQ_NEXT((s), entries); \
1587 if ((r) == NULL) { \
1588 (r) = TAILQ_NEXT((a), entries); \
1595 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
1596 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
1601 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
1602 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
1606 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
1607 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
1608 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
1609 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
1610 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
1611 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
1612 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
1613 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
1619 pf_addr_inc(struct pf_addr *addr, sa_family_t af)
1624 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
1628 if (addr->addr32[3] == 0xffffffff) {
1629 addr->addr32[3] = 0;
1630 if (addr->addr32[2] == 0xffffffff) {
1631 addr->addr32[2] = 0;
1632 if (addr->addr32[1] == 0xffffffff) {
1633 addr->addr32[1] = 0;
1635 htonl(ntohl(addr->addr32[0]) + 1);
1638 htonl(ntohl(addr->addr32[1]) + 1);
1641 htonl(ntohl(addr->addr32[2]) + 1);
1644 htonl(ntohl(addr->addr32[3]) + 1);
1650 #define mix(a,b,c) \
1652 a -= b; a -= c; a ^= (c >> 13); \
1653 b -= c; b -= a; b ^= (a << 8); \
1654 c -= a; c -= b; c ^= (b >> 13); \
1655 a -= b; a -= c; a ^= (c >> 12); \
1656 b -= c; b -= a; b ^= (a << 16); \
1657 c -= a; c -= b; c ^= (b >> 5); \
1658 a -= b; a -= c; a ^= (c >> 3); \
1659 b -= c; b -= a; b ^= (a << 10); \
1660 c -= a; c -= b; c ^= (b >> 15); \
1664 * hash function based on bridge_hash in if_bridge.c
1667 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash,
1668 struct pf_poolhashkey *key, sa_family_t af)
1670 u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0];
1675 a += inaddr->addr32[0];
1678 hash->addr32[0] = c + key->key32[2];
1683 a += inaddr->addr32[0];
1684 b += inaddr->addr32[2];
1686 hash->addr32[0] = c;
1687 a += inaddr->addr32[1];
1688 b += inaddr->addr32[3];
1691 hash->addr32[1] = c;
1692 a += inaddr->addr32[2];
1693 b += inaddr->addr32[1];
1696 hash->addr32[2] = c;
1697 a += inaddr->addr32[3];
1698 b += inaddr->addr32[0];
1701 hash->addr32[3] = c;
1708 pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr,
1709 struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn)
1711 unsigned char hash[16];
1712 struct pf_pool *rpool = &r->rpool;
1713 struct pf_addr *raddr = &rpool->cur->addr.v.a.addr;
1714 struct pf_addr *rmask = &rpool->cur->addr.v.a.mask;
1715 struct pf_pooladdr *acur = rpool->cur;
1716 struct pf_src_node k;
1718 if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR &&
1719 (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
1721 PF_ACPY(&k.addr, saddr, af);
1722 if (r->rule_flag & PFRULE_RULESRCTRACK ||
1723 r->rpool.opts & PF_POOL_STICKYADDR)
1727 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
1728 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
1729 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) {
1730 PF_ACPY(naddr, &(*sn)->raddr, af);
1731 if (pf_status.debug >= PF_DEBUG_MISC) {
1732 kprintf("pf_map_addr: src tracking maps ");
1733 pf_print_host(&k.addr, 0, af);
1735 pf_print_host(naddr, 0, af);
1742 if (rpool->cur->addr.type == PF_ADDR_NOROUTE)
1744 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
1745 if (af == AF_INET) {
1746 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
1747 (rpool->opts & PF_POOL_TYPEMASK) !=
1750 raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
1751 rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
1753 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
1754 (rpool->opts & PF_POOL_TYPEMASK) !=
1757 raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
1758 rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
1760 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
1761 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN)
1762 return (1); /* unsupported */
1764 raddr = &rpool->cur->addr.v.a.addr;
1765 rmask = &rpool->cur->addr.v.a.mask;
1768 switch (rpool->opts & PF_POOL_TYPEMASK) {
1770 PF_ACPY(naddr, raddr, af);
1772 case PF_POOL_BITMASK:
1773 PF_POOLMASK(naddr, raddr, rmask, saddr, af);
1775 case PF_POOL_RANDOM:
1776 if (init_addr != NULL && PF_AZERO(init_addr, af)) {
1780 rpool->counter.addr32[0] = karc4random();
1785 if (rmask->addr32[3] != 0xffffffff)
1786 rpool->counter.addr32[3] = karc4random();
1789 if (rmask->addr32[2] != 0xffffffff)
1790 rpool->counter.addr32[2] = karc4random();
1793 if (rmask->addr32[1] != 0xffffffff)
1794 rpool->counter.addr32[1] = karc4random();
1797 if (rmask->addr32[0] != 0xffffffff)
1798 rpool->counter.addr32[0] = karc4random();
1802 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
1803 PF_ACPY(init_addr, naddr, af);
1806 PF_AINC(&rpool->counter, af);
1807 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
1810 case PF_POOL_SRCHASH:
1811 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af);
1812 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af);
1814 case PF_POOL_ROUNDROBIN:
1815 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
1816 if (!pfr_pool_get(rpool->cur->addr.p.tbl,
1817 &rpool->tblidx, &rpool->counter,
1818 &raddr, &rmask, af))
1820 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
1821 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
1822 &rpool->tblidx, &rpool->counter,
1823 &raddr, &rmask, af))
1825 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
1829 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL)
1830 rpool->cur = TAILQ_FIRST(&rpool->list);
1831 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
1833 if (pfr_pool_get(rpool->cur->addr.p.tbl,
1834 &rpool->tblidx, &rpool->counter,
1835 &raddr, &rmask, af)) {
1836 /* table contains no address of type 'af' */
1837 if (rpool->cur != acur)
1841 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
1843 if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
1844 &rpool->tblidx, &rpool->counter,
1845 &raddr, &rmask, af)) {
1846 /* table contains no address of type 'af' */
1847 if (rpool->cur != acur)
1852 raddr = &rpool->cur->addr.v.a.addr;
1853 rmask = &rpool->cur->addr.v.a.mask;
1854 PF_ACPY(&rpool->counter, raddr, af);
1858 PF_ACPY(naddr, &rpool->counter, af);
1859 PF_AINC(&rpool->counter, af);
1863 PF_ACPY(&(*sn)->raddr, naddr, af);
1865 if (pf_status.debug >= PF_DEBUG_MISC &&
1866 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
1867 kprintf("pf_map_addr: selected address ");
1868 pf_print_host(naddr, 0, af);
1876 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r,
1877 struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport,
1878 struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high,
1879 struct pf_src_node **sn)
1881 struct pf_state key;
1882 struct pf_addr init_addr;
1885 bzero(&init_addr, sizeof(init_addr));
1886 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
1892 PF_ACPY(&key.ext.addr, daddr, key.af);
1893 PF_ACPY(&key.gwy.addr, naddr, key.af);
1894 key.ext.port = dport;
1897 * port search; start random, step;
1898 * similar 2 portloop in in_pcbbind
1900 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP)) {
1902 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL)
1904 } else if (low == 0 && high == 0) {
1905 key.gwy.port = *nport;
1906 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL)
1908 } else if (low == high) {
1909 key.gwy.port = htons(low);
1910 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) == NULL) {
1911 *nport = htons(low);
1923 cut = karc4random() % (1 + high - low) + low;
1924 /* low <= cut <= high */
1925 for (tmp = cut; tmp <= high; ++(tmp)) {
1926 key.gwy.port = htons(tmp);
1927 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) ==
1929 *nport = htons(tmp);
1933 for (tmp = cut - 1; tmp >= low; --(tmp)) {
1934 key.gwy.port = htons(tmp);
1935 if (pf_find_state_all(&key, PF_EXT_GWY, NULL) ==
1937 *nport = htons(tmp);
1943 switch (r->rpool.opts & PF_POOL_TYPEMASK) {
1944 case PF_POOL_RANDOM:
1945 case PF_POOL_ROUNDROBIN:
1946 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
1950 case PF_POOL_SRCHASH:
1951 case PF_POOL_BITMASK:
1955 } while (! PF_AEQ(&init_addr, naddr, af) );
1957 return (1); /* none available */
1961 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
1962 int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport,
1963 struct pf_addr *daddr, u_int16_t dport, int rs_num)
1965 struct pf_rule *r, *rm = NULL, *anchorrule = NULL;
1966 struct pf_ruleset *ruleset = NULL;
1968 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr);
1969 while (r && rm == NULL) {
1970 struct pf_rule_addr *src = NULL, *dst = NULL;
1971 struct pf_addr_wrap *xdst = NULL;
1973 if (r->action == PF_BINAT && direction == PF_IN) {
1975 if (r->rpool.cur != NULL)
1976 xdst = &r->rpool.cur->addr;
1983 if (r->kif != NULL &&
1984 (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
1985 r = r->skip[PF_SKIP_IFP].ptr;
1986 else if (r->direction && r->direction != direction)
1987 r = r->skip[PF_SKIP_DIR].ptr;
1988 else if (r->af && r->af != pd->af)
1989 r = r->skip[PF_SKIP_AF].ptr;
1990 else if (r->proto && r->proto != pd->proto)
1991 r = r->skip[PF_SKIP_PROTO].ptr;
1992 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, src->not))
1993 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR :
1994 PF_SKIP_DST_ADDR].ptr;
1995 else if (src->port_op && !pf_match_port(src->port_op,
1996 src->port[0], src->port[1], sport))
1997 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT :
1998 PF_SKIP_DST_PORT].ptr;
1999 else if (dst != NULL &&
2000 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->not))
2001 r = r->skip[PF_SKIP_DST_ADDR].ptr;
2002 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 0))
2003 r = TAILQ_NEXT(r, entries);
2004 else if (dst != NULL && dst->port_op &&
2005 !pf_match_port(dst->port_op, dst->port[0],
2006 dst->port[1], dport))
2007 r = r->skip[PF_SKIP_DST_PORT].ptr;
2008 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto !=
2009 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m,
2010 off, pd->hdr.tcp), r->os_fingerprint)))
2011 r = TAILQ_NEXT(r, entries);
2012 else if (r->anchorname[0] && r->anchor == NULL)
2013 r = TAILQ_NEXT(r, entries);
2014 else if (r->anchor == NULL)
2017 PF_STEP_INTO_ANCHOR(r, anchorrule, ruleset, rs_num);
2018 if (r == NULL && anchorrule != NULL)
2019 PF_STEP_OUT_OF_ANCHOR(r, anchorrule, ruleset,
2022 if (rm != NULL && (rm->action == PF_NONAT ||
2023 rm->action == PF_NORDR || rm->action == PF_NOBINAT))
2029 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction,
2030 struct pfi_kif *kif, struct pf_src_node **sn,
2031 struct pf_addr *saddr, u_int16_t sport,
2032 struct pf_addr *daddr, u_int16_t dport,
2033 struct pf_addr *naddr, u_int16_t *nport)
2035 struct pf_rule *r = NULL;
2037 if (direction == PF_OUT) {
2038 r = pf_match_translation(pd, m, off, direction, kif, saddr,
2039 sport, daddr, dport, PF_RULESET_BINAT);
2041 r = pf_match_translation(pd, m, off, direction, kif,
2042 saddr, sport, daddr, dport, PF_RULESET_NAT);
2044 r = pf_match_translation(pd, m, off, direction, kif, saddr,
2045 sport, daddr, dport, PF_RULESET_RDR);
2047 r = pf_match_translation(pd, m, off, direction, kif,
2048 saddr, sport, daddr, dport, PF_RULESET_BINAT);
2052 switch (r->action) {
2058 if (pf_get_sport(pd->af, pd->proto, r, saddr,
2059 daddr, dport, naddr, nport, r->rpool.proxy_port[0],
2060 r->rpool.proxy_port[1], sn)) {
2061 DPFPRINTF(PF_DEBUG_MISC,
2062 ("pf: NAT proxy port allocation "
2064 r->rpool.proxy_port[0],
2065 r->rpool.proxy_port[1]));
2070 switch (direction) {
2072 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){
2073 if (pd->af == AF_INET) {
2074 if (r->rpool.cur->addr.p.dyn->
2078 &r->rpool.cur->addr.p.dyn->
2080 &r->rpool.cur->addr.p.dyn->
2084 if (r->rpool.cur->addr.p.dyn->
2088 &r->rpool.cur->addr.p.dyn->
2090 &r->rpool.cur->addr.p.dyn->
2096 &r->rpool.cur->addr.v.a.addr,
2097 &r->rpool.cur->addr.v.a.mask,
2101 if (r->src.addr.type == PF_ADDR_DYNIFTL){
2102 if (pd->af == AF_INET) {
2103 if (r->src.addr.p.dyn->
2107 &r->src.addr.p.dyn->
2109 &r->src.addr.p.dyn->
2113 if (r->src.addr.p.dyn->
2117 &r->src.addr.p.dyn->
2119 &r->src.addr.p.dyn->
2125 &r->src.addr.v.a.addr,
2126 &r->src.addr.v.a.mask, daddr,
2132 if (pf_map_addr(r->af, r, saddr, naddr, NULL, sn))
2135 if (r->rpool.proxy_port[1]) {
2136 u_int32_t tmp_nport;
2138 tmp_nport = ((ntohs(dport) -
2139 ntohs(r->dst.port[0])) %
2140 (r->rpool.proxy_port[1] -
2141 r->rpool.proxy_port[0] + 1)) +
2142 r->rpool.proxy_port[0];
2144 /* wrap around if necessary */
2145 if (tmp_nport > 65535)
2147 *nport = htons((u_int16_t)tmp_nport);
2148 } else if (r->rpool.proxy_port[0])
2149 *nport = htons(r->rpool.proxy_port[0]);
2161 struct netmsg_hashlookup {
2162 struct netmsg nm_netmsg;
2163 struct inpcb **nm_pinp;
2164 struct inpcbinfo *nm_pcbinfo;
2165 struct pf_addr *nm_saddr;
2166 struct pf_addr *nm_daddr;
2173 in_pcblookup_hash_handler(struct netmsg *msg0)
2175 struct netmsg_hashlookup *msg = (struct netmsg_hashlookup *)msg0;
2177 if (msg->nm_af == AF_INET)
2178 *msg->nm_pinp = in_pcblookup_hash(msg->nm_pcbinfo,
2179 msg->nm_saddr->v4, msg->nm_sport, msg->nm_daddr->v4,
2180 msg->nm_dport, INPLOOKUP_WILDCARD, NULL);
2183 *msg->nm_pinp = in6_pcblookup_hash(msg->nm_pcbinfo,
2184 &msg->nm_saddr->v6, msg->nm_sport, &msg->nm_daddr->v6,
2185 msg->nm_dport, INPLOOKUP_WILDCARD, NULL);
2187 lwkt_replymsg(&msg->nm_netmsg.nm_lmsg, 0);
2192 pf_socket_lookup(uid_t *uid, gid_t *gid, int direction, struct pf_pdesc *pd)
2194 struct pf_addr *saddr, *daddr;
2195 u_int16_t sport, dport;
2196 struct inpcbinfo *pi;
2199 struct netmsg_hashlookup *msg = NULL;
2205 if (direction == PF_IN) {
2212 switch (pd->proto) {
2214 sport = pd->hdr.tcp->th_sport;
2215 dport = pd->hdr.tcp->th_dport;
2217 pi_cpu = tcp_addrcpu(saddr->v4.s_addr, sport, daddr->v4.s_addr, dport);
2218 pi = &tcbinfo[pi_cpu];
2221 * Our netstack runs lockless on MP systems
2222 * (only for TCP connections at the moment).
2224 * As we are not allowed to read another CPU's tcbinfo,
2225 * we have to ask that CPU via remote call to search the
2228 * Prepare a msg iff data belongs to another CPU.
2230 if (pi_cpu != mycpu->gd_cpuid) {
2231 msg = kmalloc(sizeof(*msg), M_LWKTMSG, M_INTWAIT);
2232 netmsg_init(&msg->nm_netmsg, &netisr_afree_rport, 0,
2233 in_pcblookup_hash_handler);
2234 msg->nm_pinp = &inp;
2235 msg->nm_pcbinfo = pi;
2236 msg->nm_saddr = saddr;
2237 msg->nm_sport = sport;
2238 msg->nm_daddr = daddr;
2239 msg->nm_dport = dport;
2240 msg->nm_af = pd->af;
2245 sport = pd->hdr.udp->uh_sport;
2246 dport = pd->hdr.udp->uh_dport;
2252 if (direction != PF_IN) {
2264 * Query other CPU, second part
2266 * msg only gets initialized when:
2268 * 2) the info belongs to another CPU
2270 * Use some switch/case magic to avoid code duplication.
2275 inp = in6_pcblookup_hash(pi, &saddr->v6, sport,
2276 &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL);
2282 /* FALLTHROUGH if SMP and on other CPU */
2287 lwkt_sendmsg(tcp_cport(pi_cpu),
2288 &msg->nm_netmsg.nm_lmsg);
2292 inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4,
2293 dport, INPLOOKUP_WILDCARD, NULL);
2302 *uid = inp->inp_socket->so_cred->cr_uid;
2303 *gid = inp->inp_socket->so_cred->cr_groups[0];
2308 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
2312 u_int8_t *opt, optlen;
2313 u_int8_t wscale = 0;
2315 hlen = th_off << 2; /* hlen <= sizeof(hdr) */
2316 if (hlen <= sizeof(struct tcphdr))
2318 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
2320 opt = hdr + sizeof(struct tcphdr);
2321 hlen -= sizeof(struct tcphdr);
2331 if (wscale > TCP_MAX_WINSHIFT)
2332 wscale = TCP_MAX_WINSHIFT;
2333 wscale |= PF_WSCALE_FLAG;
2348 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
2352 u_int8_t *opt, optlen;
2353 u_int16_t mss = tcp_mssdflt;
2355 hlen = th_off << 2; /* hlen <= sizeof(hdr) */
2356 if (hlen <= sizeof(struct tcphdr))
2358 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
2360 opt = hdr + sizeof(struct tcphdr);
2361 hlen -= sizeof(struct tcphdr);
2362 while (hlen >= TCPOLEN_MAXSEG) {
2370 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
2385 pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer)
2388 struct sockaddr_in *dst;
2392 struct sockaddr_in6 *dst6;
2393 struct route_in6 ro6;
2395 struct rtentry *rt = NULL;
2397 u_int16_t mss = tcp_mssdflt;
2402 hlen = sizeof(struct ip);
2403 bzero(&ro, sizeof(ro));
2404 dst = (struct sockaddr_in *)&ro.ro_dst;
2405 dst->sin_family = AF_INET;
2406 dst->sin_len = sizeof(*dst);
2407 dst->sin_addr = addr->v4;
2408 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING));
2414 hlen = sizeof(struct ip6_hdr);
2415 bzero(&ro6, sizeof(ro6));
2416 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst;
2417 dst6->sin6_family = AF_INET6;
2418 dst6->sin6_len = sizeof(*dst6);
2419 dst6->sin6_addr = addr->v6;
2420 rtalloc_ign((struct route *)&ro6, (RTF_CLONING | RTF_PRCLONING));
2426 if (rt && rt->rt_ifp) {
2427 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr);
2428 mss = max(tcp_mssdflt, mss);
2431 mss = min(mss, offer);
2432 mss = max(mss, 64); /* sanity - at least max opt space */
2437 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr)
2439 struct pf_rule *r = s->rule.ptr;
2442 if (!r->rt || r->rt == PF_FASTROUTE)
2447 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL,
2449 s->rt_kif = r->rpool.cur->kif;
2454 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL,
2456 s->rt_kif = r->rpool.cur->kif;
2463 pf_test_tcp(struct pf_rule **rm, struct pf_state **sm, int direction,
2464 struct pfi_kif *kif, struct mbuf *m, int off, void *h,
2465 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm)
2467 struct pf_rule *nr = NULL;
2468 struct pf_addr *saddr = pd->src, *daddr = pd->dst;
2469 struct tcphdr *th = pd->hdr.tcp;
2470 u_int16_t bport, nport = 0;
2471 sa_family_t af = pd->af;
2475 struct pf_rule *r, *a = NULL;
2476 struct pf_ruleset *ruleset = NULL;
2477 struct pf_src_node *nsn = NULL;
2481 u_int16_t mss = tcp_mssdflt;
2483 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
2485 if (direction == PF_OUT) {
2486 bport = nport = th->th_sport;
2487 /* check outgoing packet for BINAT/NAT */
2488 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
2489 saddr, th->th_sport, daddr, th->th_dport,
2490 &pd->naddr, &nport)) != NULL) {
2491 PF_ACPY(&pd->baddr, saddr, af);
2492 pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
2493 &th->th_sum, &pd->naddr, nport, 0, af);
2500 bport = nport = th->th_dport;
2501 /* check incoming packet for BINAT/RDR */
2502 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
2503 saddr, th->th_sport, daddr, th->th_dport,
2504 &pd->naddr, &nport)) != NULL) {
2505 PF_ACPY(&pd->baddr, daddr, af);
2506 pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
2507 &th->th_sum, &pd->naddr, nport, 0, af);
2517 if (r->kif != NULL &&
2518 (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
2519 r = r->skip[PF_SKIP_IFP].ptr;
2520 else if (r->direction && r->direction != direction)
2521 r = r->skip[PF_SKIP_DIR].ptr;
2522 else if (r->af && r->af != af)
2523 r = r->skip[PF_SKIP_AF].ptr;
2524 else if (r->proto && r->proto != IPPROTO_TCP)
2525 r = r->skip[PF_SKIP_PROTO].ptr;
2526 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not))
2527 r = r->skip[PF_SKIP_SRC_ADDR].ptr;
2528 else if (r->src.port_op && !pf_match_port(r->src.port_op,
2529 r->src.port[0], r->src.port[1], th->th_sport))
2530 r = r->skip[PF_SKIP_SRC_PORT].ptr;
2531 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not))
2532 r = r->skip[PF_SKIP_DST_ADDR].ptr;
2533 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
2534 r->dst.port[0], r->dst.port[1], th->th_dport))
2535 r = r->skip[PF_SKIP_DST_PORT].ptr;
2536 else if (r->tos && !(r->tos & pd->tos))
2537 r = TAILQ_NEXT(r, entries);
2538 else if (r->rule_flag & PFRULE_FRAGMENT)
2539 r = TAILQ_NEXT(r, entries);
2540 else if ((r->flagset & th->th_flags) != r->flags)
2541 r = TAILQ_NEXT(r, entries);
2542 else if (r->uid.op && (lookup != -1 || (lookup =
2543 pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
2544 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
2546 r = TAILQ_NEXT(r, entries);
2547 else if (r->gid.op && (lookup != -1 || (lookup =
2548 pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
2549 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
2551 r = TAILQ_NEXT(r, entries);
2552 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag))
2553 r = TAILQ_NEXT(r, entries);
2554 else if (r->anchorname[0] && r->anchor == NULL)
2555 r = TAILQ_NEXT(r, entries);
2556 else if (r->os_fingerprint != PF_OSFP_ANY && !pf_osfp_match(
2557 pf_osfp_fingerprint(pd, m, off, th), r->os_fingerprint))
2558 r = TAILQ_NEXT(r, entries);
2562 if (r->anchor == NULL) {
2568 r = TAILQ_NEXT(r, entries);
2570 PF_STEP_INTO_ANCHOR(r, a, ruleset,
2573 if (r == NULL && a != NULL)
2574 PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
2581 REASON_SET(&reason, PFRES_MATCH);
2585 m_copyback(m, off, sizeof(*th), (caddr_t)th);
2586 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
2589 if ((r->action == PF_DROP) &&
2590 ((r->rule_flag & PFRULE_RETURNRST) ||
2591 (r->rule_flag & PFRULE_RETURNICMP) ||
2592 (r->rule_flag & PFRULE_RETURN))) {
2593 /* undo NAT changes, if they have taken place */
2595 if (direction == PF_OUT) {
2596 pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
2597 &th->th_sum, &pd->baddr, bport, 0, af);
2600 pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
2601 &th->th_sum, &pd->baddr, bport, 0, af);
2605 if (((r->rule_flag & PFRULE_RETURNRST) ||
2606 (r->rule_flag & PFRULE_RETURN)) &&
2607 !(th->th_flags & TH_RST)) {
2608 u_int32_t ack = ntohl(th->th_seq) + pd->p_len;
2610 if (th->th_flags & TH_SYN)
2612 if (th->th_flags & TH_FIN)
2614 pf_send_tcp(r, af, pd->dst,
2615 pd->src, th->th_dport, th->th_sport,
2616 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
2618 } else if ((af == AF_INET) && r->return_icmp)
2619 pf_send_icmp(m, r->return_icmp >> 8,
2620 r->return_icmp & 255, af, r);
2621 else if ((af == AF_INET6) && r->return_icmp6)
2622 pf_send_icmp(m, r->return_icmp6 >> 8,
2623 r->return_icmp6 & 255, af, r);
2626 if (r->action == PF_DROP)
2629 pf_tag_packet(m, tag);
2631 if (r->keep_state || nr != NULL ||
2632 (pd->flags & PFDESC_TCP_NORM)) {
2633 /* create new state */
2635 struct pf_state *s = NULL;
2636 struct pf_src_node *sn = NULL;
2638 len = pd->tot_len - off - (th->th_off << 2);
2640 /* check maximums */
2641 if (r->max_states && (r->states >= r->max_states))
2643 /* src node for flter rule */
2644 if ((r->rule_flag & PFRULE_SRCTRACK ||
2645 r->rpool.opts & PF_POOL_STICKYADDR) &&
2646 pf_insert_src_node(&sn, r, saddr, af) != 0)
2648 /* src node for translation rule */
2649 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
2650 ((direction == PF_OUT &&
2651 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
2652 (pf_insert_src_node(&nsn, nr, saddr, af) != 0)))
2654 s = pool_get(&pf_state_pl, PR_NOWAIT);
2657 if (sn != NULL && sn->states == 0 && sn->expire == 0) {
2658 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
2659 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
2660 pf_status.src_nodes--;
2661 pool_put(&pf_src_tree_pl, sn);
2663 if (nsn != sn && nsn != NULL && nsn->states == 0 &&
2665 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
2666 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
2667 pf_status.src_nodes--;
2668 pool_put(&pf_src_tree_pl, nsn);
2670 REASON_SET(&reason, PFRES_MEMORY);
2673 bzero(s, sizeof(*s));
2678 s->nat_rule.ptr = nr;
2679 if (s->nat_rule.ptr != NULL)
2680 s->nat_rule.ptr->states++;
2682 s->allow_opts = r->allow_opts;
2683 s->log = r->log & 2;
2684 s->proto = IPPROTO_TCP;
2685 s->direction = direction;
2687 if (direction == PF_OUT) {
2688 PF_ACPY(&s->gwy.addr, saddr, af);
2689 s->gwy.port = th->th_sport; /* sport */
2690 PF_ACPY(&s->ext.addr, daddr, af);
2691 s->ext.port = th->th_dport;
2693 PF_ACPY(&s->lan.addr, &pd->baddr, af);
2694 s->lan.port = bport;
2696 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
2697 s->lan.port = s->gwy.port;
2700 PF_ACPY(&s->lan.addr, daddr, af);
2701 s->lan.port = th->th_dport;
2702 PF_ACPY(&s->ext.addr, saddr, af);
2703 s->ext.port = th->th_sport;
2705 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
2706 s->gwy.port = bport;
2708 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
2709 s->gwy.port = s->lan.port;
2713 s->src.seqlo = ntohl(th->th_seq);
2714 s->src.seqhi = s->src.seqlo + len + 1;
2715 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
2716 r->keep_state == PF_STATE_MODULATE) {
2717 /* Generate sequence number modulator */
2718 while ((s->src.seqdiff = karc4random()) == 0)
2720 pf_change_a(&th->th_seq, &th->th_sum,
2721 htonl(s->src.seqlo + s->src.seqdiff), 0);
2725 if (th->th_flags & TH_SYN) {
2727 s->src.wscale = pf_get_wscale(m, off, th->th_off, af);
2729 s->src.max_win = MAX(ntohs(th->th_win), 1);
2730 if (s->src.wscale & PF_WSCALE_MASK) {
2731 /* Remove scale factor from initial window */
2732 int win = s->src.max_win;
2733 win += 1 << (s->src.wscale & PF_WSCALE_MASK);
2734 s->src.max_win = (win - 1) >>
2735 (s->src.wscale & PF_WSCALE_MASK);
2737 if (th->th_flags & TH_FIN)
2741 s->src.state = TCPS_SYN_SENT;
2742 s->dst.state = TCPS_CLOSED;
2743 s->creation = time_second;
2744 s->expire = time_second;
2745 s->timeout = PFTM_TCP_FIRST_PACKET;
2746 pf_set_rt_ifp(s, saddr);
2749 s->src_node->states++;
2752 PF_ACPY(&nsn->raddr, &pd->naddr, af);
2753 s->nat_src_node = nsn;
2754 s->nat_src_node->states++;
2756 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
2757 off, pd, th, &s->src, &s->dst)) {
2758 REASON_SET(&reason, PFRES_MEMORY);
2759 pf_src_tree_remove_state(s);
2760 pool_put(&pf_state_pl, s);
2763 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
2764 pf_normalize_tcp_stateful(m, off, pd, &reason, th, &s->src,
2765 &s->dst, &rewrite)) {
2766 pf_normalize_tcp_cleanup(s);
2767 pf_src_tree_remove_state(s);
2768 pool_put(&pf_state_pl, s);
2771 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
2772 pf_normalize_tcp_cleanup(s);
2773 REASON_SET(&reason, PFRES_MEMORY);
2774 pf_src_tree_remove_state(s);
2775 pool_put(&pf_state_pl, s);
2779 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
2780 r->keep_state == PF_STATE_SYNPROXY) {
2781 s->src.state = PF_TCPS_PROXY_SRC;
2783 if (direction == PF_OUT) {
2784 pf_change_ap(saddr, &th->th_sport,
2785 pd->ip_sum, &th->th_sum, &pd->baddr,
2788 pf_change_ap(daddr, &th->th_dport,
2789 pd->ip_sum, &th->th_sum, &pd->baddr,
2793 s->src.seqhi = karc4random();
2794 /* Find mss option */
2795 mss = pf_get_mss(m, off, th->th_off, af);
2796 mss = pf_calc_mss(saddr, af, mss);
2797 mss = pf_calc_mss(daddr, af, mss);
2799 pf_send_tcp(r, af, daddr, saddr, th->th_dport,
2800 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
2801 TH_SYN|TH_ACK, 0, s->src.mss, 0);
2802 return (PF_SYNPROXY_DROP);
2806 /* copy back packet headers if we performed NAT operations */
2808 m_copyback(m, off, sizeof(*th), (caddr_t)th);
2814 pf_test_udp(struct pf_rule **rm, struct pf_state **sm, int direction,
2815 struct pfi_kif *kif, struct mbuf *m, int off, void *h,
2816 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm)
2818 struct pf_rule *nr = NULL;
2819 struct pf_addr *saddr = pd->src, *daddr = pd->dst;
2820 struct udphdr *uh = pd->hdr.udp;
2821 u_int16_t bport, nport = 0;
2822 sa_family_t af = pd->af;
2826 struct pf_rule *r, *a = NULL;
2827 struct pf_ruleset *ruleset = NULL;
2828 struct pf_src_node *nsn = NULL;
2833 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
2835 if (direction == PF_OUT) {
2836 bport = nport = uh->uh_sport;
2837 /* check outgoing packet for BINAT/NAT */
2838 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
2839 saddr, uh->uh_sport, daddr, uh->uh_dport,
2840 &pd->naddr, &nport)) != NULL) {
2841 PF_ACPY(&pd->baddr, saddr, af);
2842 pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum,
2843 &uh->uh_sum, &pd->naddr, nport, 1, af);
2850 bport = nport = uh->uh_dport;
2851 /* check incoming packet for BINAT/RDR */
2852 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
2853 saddr, uh->uh_sport, daddr, uh->uh_dport, &pd->naddr,
2855 PF_ACPY(&pd->baddr, daddr, af);
2856 pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum,
2857 &uh->uh_sum, &pd->naddr, nport, 1, af);
2867 if (r->kif != NULL &&
2868 (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
2869 r = r->skip[PF_SKIP_IFP].ptr;
2870 else if (r->direction && r->direction != direction)
2871 r = r->skip[PF_SKIP_DIR].ptr;
2872 else if (r->af && r->af != af)
2873 r = r->skip[PF_SKIP_AF].ptr;
2874 else if (r->proto && r->proto != IPPROTO_UDP)
2875 r = r->skip[PF_SKIP_PROTO].ptr;
2876 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not))
2877 r = r->skip[PF_SKIP_SRC_ADDR].ptr;
2878 else if (r->src.port_op && !pf_match_port(r->src.port_op,
2879 r->src.port[0], r->src.port[1], uh->uh_sport))
2880 r = r->skip[PF_SKIP_SRC_PORT].ptr;
2881 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not))
2882 r = r->skip[PF_SKIP_DST_ADDR].ptr;
2883 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
2884 r->dst.port[0], r->dst.port[1], uh->uh_dport))
2885 r = r->skip[PF_SKIP_DST_PORT].ptr;
2886 else if (r->tos && !(r->tos & pd->tos))
2887 r = TAILQ_NEXT(r, entries);
2888 else if (r->rule_flag & PFRULE_FRAGMENT)
2889 r = TAILQ_NEXT(r, entries);
2890 else if (r->uid.op && (lookup != -1 || (lookup =
2891 pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
2892 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
2894 r = TAILQ_NEXT(r, entries);
2895 else if (r->gid.op && (lookup != -1 || (lookup =
2896 pf_socket_lookup(&uid, &gid, direction, pd), 1)) &&
2897 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
2899 r = TAILQ_NEXT(r, entries);
2900 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag))
2901 r = TAILQ_NEXT(r, entries);
2902 else if (r->anchorname[0] && r->anchor == NULL)
2903 r = TAILQ_NEXT(r, entries);
2904 else if (r->os_fingerprint != PF_OSFP_ANY)
2905 r = TAILQ_NEXT(r, entries);
2909 if (r->anchor == NULL) {
2915 r = TAILQ_NEXT(r, entries);
2917 PF_STEP_INTO_ANCHOR(r, a, ruleset,
2920 if (r == NULL && a != NULL)
2921 PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
2928 REASON_SET(&reason, PFRES_MATCH);
2932 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
2933 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
2936 if ((r->action == PF_DROP) &&
2937 ((r->rule_flag & PFRULE_RETURNICMP) ||
2938 (r->rule_flag & PFRULE_RETURN))) {
2939 /* undo NAT changes, if they have taken place */
2941 if (direction == PF_OUT) {
2942 pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum,
2943 &uh->uh_sum, &pd->baddr, bport, 1, af);
2946 pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum,
2947 &uh->uh_sum, &pd->baddr, bport, 1, af);
2951 if ((af == AF_INET) && r->return_icmp)
2952 pf_send_icmp(m, r->return_icmp >> 8,
2953 r->return_icmp & 255, af, r);
2954 else if ((af == AF_INET6) && r->return_icmp6)
2955 pf_send_icmp(m, r->return_icmp6 >> 8,
2956 r->return_icmp6 & 255, af, r);
2959 if (r->action == PF_DROP)
2962 pf_tag_packet(m, tag);
2964 if (r->keep_state || nr != NULL) {
2965 /* create new state */
2966 struct pf_state *s = NULL;
2967 struct pf_src_node *sn = NULL;
2969 /* check maximums */
2970 if (r->max_states && (r->states >= r->max_states))
2972 /* src node for flter rule */
2973 if ((r->rule_flag & PFRULE_SRCTRACK ||
2974 r->rpool.opts & PF_POOL_STICKYADDR) &&
2975 pf_insert_src_node(&sn, r, saddr, af) != 0)
2977 /* src node for translation rule */
2978 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
2979 ((direction == PF_OUT &&
2980 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
2981 (pf_insert_src_node(&nsn, nr, saddr, af) != 0)))
2983 s = pool_get(&pf_state_pl, PR_NOWAIT);
2986 if (sn != NULL && sn->states == 0 && sn->expire == 0) {
2987 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
2988 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
2989 pf_status.src_nodes--;
2990 pool_put(&pf_src_tree_pl, sn);
2992 if (nsn != sn && nsn != NULL && nsn->states == 0 &&
2994 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
2995 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
2996 pf_status.src_nodes--;
2997 pool_put(&pf_src_tree_pl, nsn);
2999 REASON_SET(&reason, PFRES_MEMORY);
3002 bzero(s, sizeof(*s));
3007 s->nat_rule.ptr = nr;
3008 if (s->nat_rule.ptr != NULL)
3009 s->nat_rule.ptr->states++;
3011 s->allow_opts = r->allow_opts;
3012 s->log = r->log & 2;
3013 s->proto = IPPROTO_UDP;
3014 s->direction = direction;
3016 if (direction == PF_OUT) {
3017 PF_ACPY(&s->gwy.addr, saddr, af);
3018 s->gwy.port = uh->uh_sport;
3019 PF_ACPY(&s->ext.addr, daddr, af);
3020 s->ext.port = uh->uh_dport;
3022 PF_ACPY(&s->lan.addr, &pd->baddr, af);
3023 s->lan.port = bport;
3025 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
3026 s->lan.port = s->gwy.port;
3029 PF_ACPY(&s->lan.addr, daddr, af);
3030 s->lan.port = uh->uh_dport;
3031 PF_ACPY(&s->ext.addr, saddr, af);
3032 s->ext.port = uh->uh_sport;
3034 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
3035 s->gwy.port = bport;
3037 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
3038 s->gwy.port = s->lan.port;
3041 s->src.state = PFUDPS_SINGLE;
3042 s->dst.state = PFUDPS_NO_TRAFFIC;
3043 s->creation = time_second;
3044 s->expire = time_second;
3045 s->timeout = PFTM_UDP_FIRST_PACKET;
3046 pf_set_rt_ifp(s, saddr);
3049 s->src_node->states++;
3052 PF_ACPY(&nsn->raddr, &pd->naddr, af);
3053 s->nat_src_node = nsn;
3054 s->nat_src_node->states++;
3056 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
3057 REASON_SET(&reason, PFRES_MEMORY);
3058 pf_src_tree_remove_state(s);
3059 pool_put(&pf_state_pl, s);
3065 /* copy back packet headers if we performed NAT operations */
3067 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
3073 pf_test_icmp(struct pf_rule **rm, struct pf_state **sm, int direction,
3074 struct pfi_kif *kif, struct mbuf *m, int off, void *h,
3075 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm)
3077 struct pf_rule *nr = NULL;
3078 struct pf_addr *saddr = pd->src, *daddr = pd->dst;
3079 struct pf_rule *r, *a = NULL;
3080 struct pf_ruleset *ruleset = NULL;
3081 struct pf_src_node *nsn = NULL;
3083 u_int16_t icmpid = 0;
3084 sa_family_t af = pd->af;
3085 u_int8_t icmptype = 0, icmpcode = 0;
3092 switch (pd->proto) {
3095 icmptype = pd->hdr.icmp->icmp_type;
3096 icmpcode = pd->hdr.icmp->icmp_code;
3097 icmpid = pd->hdr.icmp->icmp_id;
3099 if (icmptype == ICMP_UNREACH ||
3100 icmptype == ICMP_SOURCEQUENCH ||
3101 icmptype == ICMP_REDIRECT ||
3102 icmptype == ICMP_TIMXCEED ||
3103 icmptype == ICMP_PARAMPROB)
3108 case IPPROTO_ICMPV6:
3109 icmptype = pd->hdr.icmp6->icmp6_type;
3110 icmpcode = pd->hdr.icmp6->icmp6_code;
3111 icmpid = pd->hdr.icmp6->icmp6_id;
3113 if (icmptype == ICMP6_DST_UNREACH ||
3114 icmptype == ICMP6_PACKET_TOO_BIG ||
3115 icmptype == ICMP6_TIME_EXCEEDED ||
3116 icmptype == ICMP6_PARAM_PROB)
3122 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3124 if (direction == PF_OUT) {
3125 /* check outgoing packet for BINAT/NAT */
3126 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
3127 saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3128 PF_ACPY(&pd->baddr, saddr, af);
3132 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3133 pd->naddr.v4.s_addr, 0);
3138 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
3149 /* check incoming packet for BINAT/RDR */
3150 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
3151 saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3152 PF_ACPY(&pd->baddr, daddr, af);
3156 pf_change_a(&daddr->v4.s_addr,
3157 pd->ip_sum, pd->naddr.v4.s_addr, 0);
3162 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
3176 if (r->kif != NULL &&
3177 (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
3178 r = r->skip[PF_SKIP_IFP].ptr;
3179 else if (r->direction && r->direction != direction)
3180 r = r->skip[PF_SKIP_DIR].ptr;
3181 else if (r->af && r->af != af)
3182 r = r->skip[PF_SKIP_AF].ptr;
3183 else if (r->proto && r->proto != pd->proto)
3184 r = r->skip[PF_SKIP_PROTO].ptr;
3185 else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not))
3186 r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3187 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not))
3188 r = r->skip[PF_SKIP_DST_ADDR].ptr;
3189 else if (r->type && r->type != icmptype + 1)
3190 r = TAILQ_NEXT(r, entries);
3191 else if (r->code && r->code != icmpcode + 1)
3192 r = TAILQ_NEXT(r, entries);
3193 else if (r->tos && !(r->tos & pd->tos))
3194 r = TAILQ_NEXT(r, entries);
3195 else if (r->rule_flag & PFRULE_FRAGMENT)
3196 r = TAILQ_NEXT(r, entries);
3197 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag))
3198 r = TAILQ_NEXT(r, entries);
3199 else if (r->anchorname[0] && r->anchor == NULL)
3200 r = TAILQ_NEXT(r, entries);
3201 else if (r->os_fingerprint != PF_OSFP_ANY)
3202 r = TAILQ_NEXT(r, entries);
3206 if (r->anchor == NULL) {
3212 r = TAILQ_NEXT(r, entries);
3214 PF_STEP_INTO_ANCHOR(r, a, ruleset,
3217 if (r == NULL && a != NULL)
3218 PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
3225 REASON_SET(&reason, PFRES_MATCH);
3230 m_copyback(m, off, sizeof(struct icmp6_hdr),
3231 (caddr_t)pd->hdr.icmp6);
3233 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
3236 if (r->action != PF_PASS)
3239 pf_tag_packet(m, tag);
3241 if (!state_icmp && (r->keep_state || nr != NULL)) {
3242 /* create new state */
3243 struct pf_state *s = NULL;
3244 struct pf_src_node *sn = NULL;
3246 /* check maximums */
3247 if (r->max_states && (r->states >= r->max_states))
3249 /* src node for flter rule */
3250 if ((r->rule_flag & PFRULE_SRCTRACK ||
3251 r->rpool.opts & PF_POOL_STICKYADDR) &&
3252 pf_insert_src_node(&sn, r, saddr, af) != 0)
3254 /* src node for translation rule */
3255 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3256 ((direction == PF_OUT &&
3257 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
3258 (pf_insert_src_node(&nsn, nr, saddr, af) != 0)))
3260 s = pool_get(&pf_state_pl, PR_NOWAIT);
3263 if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3264 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3265 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3266 pf_status.src_nodes--;
3267 pool_put(&pf_src_tree_pl, sn);
3269 if (nsn != sn && nsn != NULL && nsn->states == 0 &&
3271 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3272 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3273 pf_status.src_nodes--;
3274 pool_put(&pf_src_tree_pl, nsn);
3276 REASON_SET(&reason, PFRES_MEMORY);
3279 bzero(s, sizeof(*s));
3284 s->nat_rule.ptr = nr;
3285 if (s->nat_rule.ptr != NULL)
3286 s->nat_rule.ptr->states++;
3288 s->allow_opts = r->allow_opts;
3289 s->log = r->log & 2;
3290 s->proto = pd->proto;
3291 s->direction = direction;
3293 if (direction == PF_OUT) {
3294 PF_ACPY(&s->gwy.addr, saddr, af);
3295 s->gwy.port = icmpid;
3296 PF_ACPY(&s->ext.addr, daddr, af);
3297 s->ext.port = icmpid;
3299 PF_ACPY(&s->lan.addr, &pd->baddr, af);
3301 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
3302 s->lan.port = icmpid;
3304 PF_ACPY(&s->lan.addr, daddr, af);
3305 s->lan.port = icmpid;
3306 PF_ACPY(&s->ext.addr, saddr, af);
3307 s->ext.port = icmpid;
3309 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
3311 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
3312 s->gwy.port = icmpid;
3314 s->creation = time_second;
3315 s->expire = time_second;
3316 s->timeout = PFTM_ICMP_FIRST_PACKET;
3317 pf_set_rt_ifp(s, saddr);
3320 s->src_node->states++;
3323 PF_ACPY(&nsn->raddr, &pd->naddr, af);
3324 s->nat_src_node = nsn;
3325 s->nat_src_node->states++;
3327 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
3328 REASON_SET(&reason, PFRES_MEMORY);
3329 pf_src_tree_remove_state(s);
3330 pool_put(&pf_state_pl, s);
3337 /* copy back packet headers if we performed IPv6 NAT operations */
3339 m_copyback(m, off, sizeof(struct icmp6_hdr),
3340 (caddr_t)pd->hdr.icmp6);
3347 pf_test_other(struct pf_rule **rm, struct pf_state **sm, int direction,
3348 struct pfi_kif *kif, struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
3349 struct pf_rule **am, struct pf_ruleset **rsm)
3351 struct pf_rule *nr = NULL;
3352 struct pf_rule *r, *a = NULL;
3353 struct pf_ruleset *ruleset = NULL;
3354 struct pf_src_node *nsn = NULL;
3355 struct pf_addr *saddr = pd->src, *daddr = pd->dst;
3356 sa_family_t af = pd->af;
3360 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3362 if (direction == PF_OUT) {
3363 /* check outgoing packet for BINAT/NAT */
3364 if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
3365 saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3366 PF_ACPY(&pd->baddr, saddr, af);
3370 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3371 pd->naddr.v4.s_addr, 0);
3376 PF_ACPY(saddr, &pd->naddr, af);
3385 /* check incoming packet for BINAT/RDR */
3386 if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
3387 saddr, 0, daddr, 0, &pd->naddr, NULL)) != NULL) {
3388 PF_ACPY(&pd->baddr, daddr, af);
3392 pf_change_a(&daddr->v4.s_addr,
3393 pd->ip_sum, pd->naddr.v4.s_addr, 0);
3398 PF_ACPY(daddr, &pd->naddr, af);
3410 if (r->kif != NULL &&
3411 (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
3412 r = r->skip[PF_SKIP_IFP].ptr;
3413 else if (r->direction && r->direction != direction)
3414 r = r->skip[PF_SKIP_DIR].ptr;
3415 else if (r->af && r->af != af)
3416 r = r->skip[PF_SKIP_AF].ptr;
3417 else if (r->proto && r->proto != pd->proto)
3418 r = r->skip[PF_SKIP_PROTO].ptr;
3419 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.not))
3420 r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3421 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.not))
3422 r = r->skip[PF_SKIP_DST_ADDR].ptr;
3423 else if (r->tos && !(r->tos & pd->tos))
3424 r = TAILQ_NEXT(r, entries);
3425 else if (r->rule_flag & PFRULE_FRAGMENT)
3426 r = TAILQ_NEXT(r, entries);
3427 else if (r->match_tag && !pf_match_tag(m, r, nr, &tag))
3428 r = TAILQ_NEXT(r, entries);
3429 else if (r->anchorname[0] && r->anchor == NULL)
3430 r = TAILQ_NEXT(r, entries);
3431 else if (r->os_fingerprint != PF_OSFP_ANY)
3432 r = TAILQ_NEXT(r, entries);
3436 if (r->anchor == NULL) {
3442 r = TAILQ_NEXT(r, entries);
3444 PF_STEP_INTO_ANCHOR(r, a, ruleset,
3447 if (r == NULL && a != NULL)
3448 PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
3455 REASON_SET(&reason, PFRES_MATCH);
3458 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
3460 if ((r->action == PF_DROP) &&
3461 ((r->rule_flag & PFRULE_RETURNICMP) ||
3462 (r->rule_flag & PFRULE_RETURN))) {
3463 struct pf_addr *a = NULL;
3466 if (direction == PF_OUT)
3475 pf_change_a(&a->v4.s_addr, pd->ip_sum,
3476 pd->baddr.v4.s_addr, 0);
3481 PF_ACPY(a, &pd->baddr, af);
3486 if ((af == AF_INET) && r->return_icmp)
3487 pf_send_icmp(m, r->return_icmp >> 8,
3488 r->return_icmp & 255, af, r);
3489 else if ((af == AF_INET6) && r->return_icmp6)
3490 pf_send_icmp(m, r->return_icmp6 >> 8,
3491 r->return_icmp6 & 255, af, r);
3494 if (r->action != PF_PASS)
3497 pf_tag_packet(m, tag);
3499 if (r->keep_state || nr != NULL) {
3500 /* create new state */
3501 struct pf_state *s = NULL;
3502 struct pf_src_node *sn = NULL;
3504 /* check maximums */
3505 if (r->max_states && (r->states >= r->max_states))
3507 /* src node for flter rule */
3508 if ((r->rule_flag & PFRULE_SRCTRACK ||
3509 r->rpool.opts & PF_POOL_STICKYADDR) &&
3510 pf_insert_src_node(&sn, r, saddr, af) != 0)
3512 /* src node for translation rule */
3513 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3514 ((direction == PF_OUT &&
3515 pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
3516 (pf_insert_src_node(&nsn, nr, saddr, af) != 0)))
3518 s = pool_get(&pf_state_pl, PR_NOWAIT);
3521 if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3522 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3523 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3524 pf_status.src_nodes--;
3525 pool_put(&pf_src_tree_pl, sn);
3527 if (nsn != sn && nsn != NULL && nsn->states == 0 &&
3529 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3530 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3531 pf_status.src_nodes--;
3532 pool_put(&pf_src_tree_pl, nsn);
3534 REASON_SET(&reason, PFRES_MEMORY);
3537 bzero(s, sizeof(*s));
3542 s->nat_rule.ptr = nr;
3543 if (s->nat_rule.ptr != NULL)
3544 s->nat_rule.ptr->states++;
3546 s->allow_opts = r->allow_opts;
3547 s->log = r->log & 2;
3548 s->proto = pd->proto;
3549 s->direction = direction;
3551 if (direction == PF_OUT) {
3552 PF_ACPY(&s->gwy.addr, saddr, af);
3553 PF_ACPY(&s->ext.addr, daddr, af);
3555 PF_ACPY(&s->lan.addr, &pd->baddr, af);
3557 PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
3559 PF_ACPY(&s->lan.addr, daddr, af);
3560 PF_ACPY(&s->ext.addr, saddr, af);
3562 PF_ACPY(&s->gwy.addr, &pd->baddr, af);
3564 PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
3566 s->src.state = PFOTHERS_SINGLE;
3567 s->dst.state = PFOTHERS_NO_TRAFFIC;
3568 s->creation = time_second;
3569 s->expire = time_second;
3570 s->timeout = PFTM_OTHER_FIRST_PACKET;
3571 pf_set_rt_ifp(s, saddr);
3574 s->src_node->states++;
3577 PF_ACPY(&nsn->raddr, &pd->naddr, af);
3578 s->nat_src_node = nsn;
3579 s->nat_src_node->states++;
3581 if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
3582 REASON_SET(&reason, PFRES_MEMORY);
3583 pf_src_tree_remove_state(s);
3584 pool_put(&pf_state_pl, s);
3594 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
3595 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
3596 struct pf_ruleset **rsm)
3598 struct pf_rule *r, *a = NULL;
3599 struct pf_ruleset *ruleset = NULL;
3600 sa_family_t af = pd->af;
3604 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3607 if (r->kif != NULL &&
3608 (r->kif != kif && r->kif != kif->pfik_parent) == !r->ifnot)
3609 r = r->skip[PF_SKIP_IFP].ptr;
3610 else if (r->direction && r->direction != direction)
3611 r = r->skip[PF_SKIP_DIR].ptr;
3612 else if (r->af && r->af != af)
3613 r = r->skip[PF_SKIP_AF].ptr;
3614 else if (r->proto && r->proto != pd->proto)
3615 r = r->skip[PF_SKIP_PROTO].ptr;
3616 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.not))
3617 r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3618 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.not))
3619 r = r->skip[PF_SKIP_DST_ADDR].ptr;
3620 else if (r->tos && !(r->tos & pd->tos))
3621 r = TAILQ_NEXT(r, entries);
3622 else if (r->src.port_op || r->dst.port_op ||
3623 r->flagset || r->type || r->code ||
3624 r->os_fingerprint != PF_OSFP_ANY)
3625 r = TAILQ_NEXT(r, entries);
3626 else if (r->match_tag && !pf_match_tag(m, r, NULL, &tag))
3627 r = TAILQ_NEXT(r, entries);
3628 else if (r->anchorname[0] && r->anchor == NULL)
3629 r = TAILQ_NEXT(r, entries);
3631 if (r->anchor == NULL) {
3637 r = TAILQ_NEXT(r, entries);
3639 PF_STEP_INTO_ANCHOR(r, a, ruleset,
3642 if (r == NULL && a != NULL)
3643 PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
3650 REASON_SET(&reason, PFRES_MATCH);
3653 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset);
3655 if (r->action != PF_PASS)
3658 pf_tag_packet(m, tag);
3664 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
3665 struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
3668 struct pf_state key;
3669 struct tcphdr *th = pd->hdr.tcp;
3670 u_int16_t win = ntohs(th->th_win);
3671 u_int32_t ack, end, seq;
3675 struct pf_state_peer *src, *dst;
3678 key.proto = IPPROTO_TCP;
3679 if (direction == PF_IN) {
3680 PF_ACPY(&key.ext.addr, pd->src, key.af);
3681 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
3682 key.ext.port = th->th_sport;
3683 key.gwy.port = th->th_dport;
3685 PF_ACPY(&key.lan.addr, pd->src, key.af);
3686 PF_ACPY(&key.ext.addr, pd->dst, key.af);
3687 key.lan.port = th->th_sport;
3688 key.ext.port = th->th_dport;
3693 if (direction == (*state)->direction) {
3694 src = &(*state)->src;
3695 dst = &(*state)->dst;
3697 src = &(*state)->dst;
3698 dst = &(*state)->src;
3701 if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
3702 if (direction != (*state)->direction)
3703 return (PF_SYNPROXY_DROP);
3704 if (th->th_flags & TH_SYN) {
3705 if (ntohl(th->th_seq) != (*state)->src.seqlo)
3707 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
3708 pd->src, th->th_dport, th->th_sport,
3709 (*state)->src.seqhi, ntohl(th->th_seq) + 1,
3710 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0);
3711 return (PF_SYNPROXY_DROP);
3712 } else if (!(th->th_flags & TH_ACK) ||
3713 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
3714 (ntohl(th->th_seq) != (*state)->src.seqlo + 1))
3717 (*state)->src.state = PF_TCPS_PROXY_DST;
3719 if ((*state)->src.state == PF_TCPS_PROXY_DST) {
3720 struct pf_state_host *src, *dst;
3722 if (direction == PF_OUT) {
3723 src = &(*state)->gwy;
3724 dst = &(*state)->ext;
3726 src = &(*state)->ext;
3727 dst = &(*state)->lan;
3729 if (direction == (*state)->direction) {
3730 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
3731 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
3732 (ntohl(th->th_seq) != (*state)->src.seqlo + 1))
3734 (*state)->src.max_win = MAX(ntohs(th->th_win), 1);
3735 if ((*state)->dst.seqhi == 1)
3736 (*state)->dst.seqhi = karc4random();
3737 pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr,
3738 &dst->addr, src->port, dst->port,
3739 (*state)->dst.seqhi, 0, TH_SYN, 0,
3740 (*state)->src.mss, 0);
3741 return (PF_SYNPROXY_DROP);
3742 } else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
3744 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1))
3747 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
3748 (*state)->dst.seqlo = ntohl(th->th_seq);
3749 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
3750 pd->src, th->th_dport, th->th_sport,
3751 ntohl(th->th_ack), ntohl(th->th_seq) + 1,
3752 TH_ACK, (*state)->src.max_win, 0, 0);
3753 pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr,
3754 &dst->addr, src->port, dst->port,
3755 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
3756 TH_ACK, (*state)->dst.max_win, 0, 0);
3757 (*state)->src.seqdiff = (*state)->dst.seqhi -
3758 (*state)->src.seqlo;
3759 (*state)->dst.seqdiff = (*state)->src.seqhi -
3760 (*state)->dst.seqlo;
3761 (*state)->src.seqhi = (*state)->src.seqlo +
3762 (*state)->src.max_win;
3763 (*state)->dst.seqhi = (*state)->dst.seqlo +
3764 (*state)->dst.max_win;
3765 (*state)->src.wscale = (*state)->dst.wscale = 0;
3766 (*state)->src.state = (*state)->dst.state =
3768 return (PF_SYNPROXY_DROP);
3772 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
3773 sws = src->wscale & PF_WSCALE_MASK;
3774 dws = dst->wscale & PF_WSCALE_MASK;
3779 * Sequence tracking algorithm from Guido van Rooij's paper:
3780 * http://www.madison-gurkha.com/publications/tcp_filtering/
3784 seq = ntohl(th->th_seq);
3785 if (src->seqlo == 0) {
3786 /* First packet from this end. Set its state */
3788 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
3789 src->scrub == NULL) {
3790 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
3791 REASON_SET(reason, PFRES_MEMORY);
3796 /* Deferred generation of sequence number modulator */
3797 if (dst->seqdiff && !src->seqdiff) {
3798 while ((src->seqdiff = karc4random()) == 0)
3800 ack = ntohl(th->th_ack) - dst->seqdiff;
3801 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3803 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3806 ack = ntohl(th->th_ack);
3809 end = seq + pd->p_len;
3810 if (th->th_flags & TH_SYN) {
3812 if (dst->wscale & PF_WSCALE_FLAG) {
3813 src->wscale = pf_get_wscale(m, off, th->th_off,
3815 if (src->wscale & PF_WSCALE_FLAG) {
3816 /* Remove scale factor from initial
3818 sws = src->wscale & PF_WSCALE_MASK;
3819 win = ((u_int32_t)win + (1 << sws) - 1)
3821 dws = dst->wscale & PF_WSCALE_MASK;
3823 /* fixup other window */
3824 dst->max_win <<= dst->wscale &
3826 /* in case of a retrans SYN|ACK */
3831 if (th->th_flags & TH_FIN)
3835 if (src->state < TCPS_SYN_SENT)
3836 src->state = TCPS_SYN_SENT;
3839 * May need to slide the window (seqhi may have been set by
3840 * the crappy stack check or if we picked up the connection
3841 * after establishment)
3843 if (src->seqhi == 1 ||
3844 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
3845 src->seqhi = end + MAX(1, dst->max_win << dws);
3846 if (win > src->max_win)
3850 ack = ntohl(th->th_ack) - dst->seqdiff;
3852 /* Modulate sequence numbers */
3853 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3855 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3858 end = seq + pd->p_len;
3859 if (th->th_flags & TH_SYN)
3861 if (th->th_flags & TH_FIN)
3865 if ((th->th_flags & TH_ACK) == 0) {
3866 /* Let it pass through the ack skew check */
3868 } else if ((ack == 0 &&
3869 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
3870 /* broken tcp stacks do not set ack */
3871 (dst->state < TCPS_SYN_SENT)) {
3873 * Many stacks (ours included) will set the ACK number in an
3874 * FIN|ACK if the SYN times out -- no sequence to ACK.
3880 /* Ease sequencing restrictions on no data packets */
3885 ackskew = dst->seqlo - ack;
3887 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */
3888 if (SEQ_GEQ(src->seqhi, end) &&
3889 /* Last octet inside other's window space */
3890 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
3891 /* Retrans: not more than one window back */
3892 (ackskew >= -MAXACKWINDOW) &&
3893 /* Acking not more than one reassembled fragment backwards */
3894 (ackskew <= (MAXACKWINDOW << sws))) {
3895 /* Acking not more than one window forward */
3897 /* update max window */
3898 if (src->max_win < win)
3900 /* synchronize sequencing */
3901 if (SEQ_GT(end, src->seqlo))
3903 /* slide the window of what the other end can send */
3904 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
3905 dst->seqhi = ack + MAX((win << sws), 1);
3909 if (th->th_flags & TH_SYN)
3910 if (src->state < TCPS_SYN_SENT)
3911 src->state = TCPS_SYN_SENT;
3912 if (th->th_flags & TH_FIN)
3913 if (src->state < TCPS_CLOSING)
3914 src->state = TCPS_CLOSING;
3915 if (th->th_flags & TH_ACK) {
3916 if (dst->state == TCPS_SYN_SENT)
3917 dst->state = TCPS_ESTABLISHED;
3918 else if (dst->state == TCPS_CLOSING)
3919 dst->state = TCPS_FIN_WAIT_2;
3921 if (th->th_flags & TH_RST)
3922 src->state = dst->state = TCPS_TIME_WAIT;
3924 /* update expire time */
3925 (*state)->expire = time_second;
3926 if (src->state >= TCPS_FIN_WAIT_2 &&
3927 dst->state >= TCPS_FIN_WAIT_2)
3928 (*state)->timeout = PFTM_TCP_CLOSED;
3929 else if (src->state >= TCPS_FIN_WAIT_2 ||
3930 dst->state >= TCPS_FIN_WAIT_2)
3931 (*state)->timeout = PFTM_TCP_FIN_WAIT;
3932 else if (src->state < TCPS_ESTABLISHED ||
3933 dst->state < TCPS_ESTABLISHED)
3934 (*state)->timeout = PFTM_TCP_OPENING;
3935 else if (src->state >= TCPS_CLOSING ||
3936 dst->state >= TCPS_CLOSING)
3937 (*state)->timeout = PFTM_TCP_CLOSING;
3939 (*state)->timeout = PFTM_TCP_ESTABLISHED;
3941 /* Fall through to PASS packet */
3943 } else if ((dst->state < TCPS_SYN_SENT ||
3944 dst->state >= TCPS_FIN_WAIT_2 ||
3945 src->state >= TCPS_FIN_WAIT_2) &&
3946 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
3947 /* Within a window forward of the originating packet */
3948 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
3949 /* Within a window backward of the originating packet */
3952 * This currently handles three situations:
3953 * 1) Stupid stacks will shotgun SYNs before their peer
3955 * 2) When PF catches an already established stream (the
3956 * firewall rebooted, the state table was flushed, routes
3958 * 3) Packets get funky immediately after the connection
3959 * closes (this should catch Solaris spurious ACK|FINs
3960 * that web servers like to spew after a close)
3962 * This must be a little more careful than the above code
3963 * since packet floods will also be caught here. We don't
3964 * update the TTL here to mitigate the damage of a packet
3965 * flood and so the same code can handle awkward establishment
3966 * and a loosened connection close.
3967 * In the establishment case, a correct peer response will
3968 * validate the connection, go through the normal state code
3969 * and keep updating the state TTL.
3972 if (pf_status.debug >= PF_DEBUG_MISC) {
3973 kprintf("pf: loose state match: ");
3974 pf_print_state(*state);
3975 pf_print_flags(th->th_flags);
3976 kprintf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d\n",
3977 seq, ack, pd->p_len, ackskew,
3978 (*state)->packets[0], (*state)->packets[1]);
3981 /* update max window */
3982 if (src->max_win < win)
3984 /* synchronize sequencing */
3985 if (SEQ_GT(end, src->seqlo))
3987 /* slide the window of what the other end can send */
3988 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
3989 dst->seqhi = ack + MAX((win << sws), 1);
3992 * Cannot set dst->seqhi here since this could be a shotgunned
3993 * SYN and not an already established connection.
3996 if (th->th_flags & TH_FIN)
3997 if (src->state < TCPS_CLOSING)
3998 src->state = TCPS_CLOSING;
3999 if (th->th_flags & TH_RST)
4000 src->state = dst->state = TCPS_TIME_WAIT;
4002 /* Fall through to PASS packet */
4005 if ((*state)->dst.state == TCPS_SYN_SENT &&
4006 (*state)->src.state == TCPS_SYN_SENT) {
4007 /* Send RST for state mismatches during handshake */
4008 if (!(th->th_flags & TH_RST)) {
4009 u_int32_t ack = ntohl(th->th_seq) + pd->p_len;
4011 if (th->th_flags & TH_SYN)
4013 if (th->th_flags & TH_FIN)
4015 pf_send_tcp((*state)->rule.ptr, pd->af,
4016 pd->dst, pd->src, th->th_dport,
4017 th->th_sport, ntohl(th->th_ack), ack,
4018 TH_RST|TH_ACK, 0, 0,
4019 (*state)->rule.ptr->return_ttl);
4024 } else if (pf_status.debug >= PF_DEBUG_MISC) {
4025 kprintf("pf: BAD state: ");
4026 pf_print_state(*state);
4027 pf_print_flags(th->th_flags);
4028 kprintf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d "
4029 "dir=%s,%s\n", seq, ack, pd->p_len, ackskew,
4030 (*state)->packets[0], (*state)->packets[1],
4031 direction == PF_IN ? "in" : "out",
4032 direction == (*state)->direction ? "fwd" : "rev");
4033 kprintf("pf: State failure on: %c %c %c %c | %c %c\n",
4034 SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
4035 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
4037 (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
4038 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
4039 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
4040 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
4045 if (dst->scrub || src->scrub) {
4046 if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4047 src, dst, ©back))
4051 /* Any packets which have gotten here are to be passed */
4053 /* translate source/destination address, if necessary */
4054 if (STATE_TRANSLATE(*state)) {
4055 if (direction == PF_OUT)
4056 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum,
4057 &th->th_sum, &(*state)->gwy.addr,
4058 (*state)->gwy.port, 0, pd->af);
4060 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum,
4061 &th->th_sum, &(*state)->lan.addr,
4062 (*state)->lan.port, 0, pd->af);
4063 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4064 } else if (copyback) {
4065 /* Copyback sequence modulation or stateful scrub changes */
4066 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4073 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
4074 struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4076 struct pf_state_peer *src, *dst;
4077 struct pf_state key;
4078 struct udphdr *uh = pd->hdr.udp;
4081 key.proto = IPPROTO_UDP;
4082 if (direction == PF_IN) {
4083 PF_ACPY(&key.ext.addr, pd->src, key.af);
4084 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
4085 key.ext.port = uh->uh_sport;
4086 key.gwy.port = uh->uh_dport;
4088 PF_ACPY(&key.lan.addr, pd->src, key.af);
4089 PF_ACPY(&key.ext.addr, pd->dst, key.af);
4090 key.lan.port = uh->uh_sport;
4091 key.ext.port = uh->uh_dport;
4096 if (direction == (*state)->direction) {
4097 src = &(*state)->src;
4098 dst = &(*state)->dst;
4100 src = &(*state)->dst;
4101 dst = &(*state)->src;
4105 if (src->state < PFUDPS_SINGLE)
4106 src->state = PFUDPS_SINGLE;
4107 if (dst->state == PFUDPS_SINGLE)
4108 dst->state = PFUDPS_MULTIPLE;
4110 /* update expire time */
4111 (*state)->expire = time_second;
4112 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
4113 (*state)->timeout = PFTM_UDP_MULTIPLE;
4115 (*state)->timeout = PFTM_UDP_SINGLE;
4117 /* translate source/destination address, if necessary */
4118 if (STATE_TRANSLATE(*state)) {
4119 if (direction == PF_OUT)
4120 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum,
4121 &uh->uh_sum, &(*state)->gwy.addr,
4122 (*state)->gwy.port, 1, pd->af);
4124 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum,
4125 &uh->uh_sum, &(*state)->lan.addr,
4126 (*state)->lan.port, 1, pd->af);
4127 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
4134 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
4135 struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4137 struct pf_addr *saddr = pd->src, *daddr = pd->dst;
4138 u_int16_t icmpid = 0;
4139 u_int16_t *icmpsum = NULL;
4140 u_int8_t icmptype = 0;
4143 switch (pd->proto) {
4146 icmptype = pd->hdr.icmp->icmp_type;
4147 icmpid = pd->hdr.icmp->icmp_id;
4148 icmpsum = &pd->hdr.icmp->icmp_cksum;
4150 if (icmptype == ICMP_UNREACH ||
4151 icmptype == ICMP_SOURCEQUENCH ||
4152 icmptype == ICMP_REDIRECT ||
4153 icmptype == ICMP_TIMXCEED ||
4154 icmptype == ICMP_PARAMPROB)
4159 case IPPROTO_ICMPV6:
4160 icmptype = pd->hdr.icmp6->icmp6_type;
4161 icmpid = pd->hdr.icmp6->icmp6_id;
4162 icmpsum = &pd->hdr.icmp6->icmp6_cksum;
4164 if (icmptype == ICMP6_DST_UNREACH ||
4165 icmptype == ICMP6_PACKET_TOO_BIG ||
4166 icmptype == ICMP6_TIME_EXCEEDED ||
4167 icmptype == ICMP6_PARAM_PROB)
4176 * ICMP query/reply message not related to a TCP/UDP packet.
4177 * Search for an ICMP state.
4179 struct pf_state key;
4182 key.proto = pd->proto;
4183 if (direction == PF_IN) {
4184 PF_ACPY(&key.ext.addr, pd->src, key.af);
4185 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
4186 key.ext.port = icmpid;
4187 key.gwy.port = icmpid;
4189 PF_ACPY(&key.lan.addr, pd->src, key.af);
4190 PF_ACPY(&key.ext.addr, pd->dst, key.af);
4191 key.lan.port = icmpid;
4192 key.ext.port = icmpid;
4197 (*state)->expire = time_second;
4198 (*state)->timeout = PFTM_ICMP_ERROR_REPLY;
4200 /* translate source/destination address, if necessary */
4201 if (PF_ANEQ(&(*state)->lan.addr, &(*state)->gwy.addr, pd->af)) {
4202 if (direction == PF_OUT) {
4206 pf_change_a(&saddr->v4.s_addr,
4208 (*state)->gwy.addr.v4.s_addr, 0);
4214 &pd->hdr.icmp6->icmp6_cksum,
4215 &(*state)->gwy.addr, 0);
4217 sizeof(struct icmp6_hdr),
4218 (caddr_t)pd->hdr.icmp6);
4226 pf_change_a(&daddr->v4.s_addr,
4228 (*state)->lan.addr.v4.s_addr, 0);
4234 &pd->hdr.icmp6->icmp6_cksum,
4235 &(*state)->lan.addr, 0);
4237 sizeof(struct icmp6_hdr),
4238 (caddr_t)pd->hdr.icmp6);
4249 * ICMP error message in response to a TCP/UDP packet.
4250 * Extract the inner TCP/UDP header and search for that state.
4253 struct pf_pdesc pd2;
4258 struct ip6_hdr h2_6;
4268 /* offset of h2 in mbuf chain */
4269 ipoff2 = off + ICMP_MINLEN;
4271 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
4272 NULL, NULL, pd2.af)) {
4273 DPFPRINTF(PF_DEBUG_MISC,
4274 ("pf: ICMP error message too short "
4279 * ICMP error messages don't refer to non-first
4283 * Note: We are dealing with an encapsulated
4284 * header. This means ip_off/ip_len are not
4285 * in host byte order!
4287 if (h2.ip_off & htons(IP_OFFMASK))
4290 /* offset of protocol header that follows h2 */
4291 off2 = ipoff2 + (h2.ip_hl << 2);
4293 pd2.proto = h2.ip_p;
4294 pd2.src = (struct pf_addr *)&h2.ip_src;
4295 pd2.dst = (struct pf_addr *)&h2.ip_dst;
4296 pd2.ip_sum = &h2.ip_sum;
4301 ipoff2 = off + sizeof(struct icmp6_hdr);
4303 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
4304 NULL, NULL, pd2.af)) {
4305 DPFPRINTF(PF_DEBUG_MISC,
4306 ("pf: ICMP error message too short "
4310 pd2.proto = h2_6.ip6_nxt;
4311 pd2.src = (struct pf_addr *)&h2_6.ip6_src;
4312 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
4314 off2 = ipoff2 + sizeof(h2_6);
4316 switch (pd2.proto) {
4317 case IPPROTO_FRAGMENT:
4319 * ICMPv6 error messages for
4320 * non-first fragments
4324 case IPPROTO_HOPOPTS:
4325 case IPPROTO_ROUTING:
4326 case IPPROTO_DSTOPTS: {
4327 /* get next header and header length */
4328 struct ip6_ext opt6;
4330 if (!pf_pull_hdr(m, off2, &opt6,
4331 sizeof(opt6), NULL, NULL, pd2.af)) {
4332 DPFPRINTF(PF_DEBUG_MISC,
4333 ("pf: ICMPv6 short opt\n"));
4336 if (pd2.proto == IPPROTO_AH)
4337 off2 += (opt6.ip6e_len + 2) * 4;
4339 off2 += (opt6.ip6e_len + 1) * 8;
4340 pd2.proto = opt6.ip6e_nxt;
4341 /* goto the next header */
4348 } while (!terminal);
4353 switch (pd2.proto) {
4357 struct pf_state key;
4358 struct pf_state_peer *src, *dst;
4363 * Only the first 8 bytes of the TCP header can be
4364 * expected. Don't access any TCP header fields after
4365 * th_seq, an ackskew test is not possible.
4367 if (!pf_pull_hdr(m, off2, &th, 8, NULL, NULL, pd2.af)) {
4368 DPFPRINTF(PF_DEBUG_MISC,
4369 ("pf: ICMP error message too short "
4375 key.proto = IPPROTO_TCP;
4376 if (direction == PF_IN) {
4377 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4378 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4379 key.ext.port = th.th_dport;
4380 key.gwy.port = th.th_sport;
4382 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4383 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4384 key.lan.port = th.th_dport;
4385 key.ext.port = th.th_sport;
4390 if (direction == (*state)->direction) {
4391 src = &(*state)->dst;
4392 dst = &(*state)->src;
4394 src = &(*state)->src;
4395 dst = &(*state)->dst;
4398 if (src->wscale && dst->wscale &&
4399 !(th.th_flags & TH_SYN))
4400 dws = dst->wscale & PF_WSCALE_MASK;
4404 /* Demodulate sequence number */
4405 seq = ntohl(th.th_seq) - src->seqdiff;
4407 pf_change_a(&th.th_seq, icmpsum,
4412 if (!SEQ_GEQ(src->seqhi, seq) ||
4413 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) {
4414 if (pf_status.debug >= PF_DEBUG_MISC) {
4415 kprintf("pf: BAD ICMP %d:%d ",
4416 icmptype, pd->hdr.icmp->icmp_code);
4417 pf_print_host(pd->src, 0, pd->af);
4419 pf_print_host(pd->dst, 0, pd->af);
4420 kprintf(" state: ");
4421 pf_print_state(*state);
4422 kprintf(" seq=%u\n", seq);
4427 if (STATE_TRANSLATE(*state)) {
4428 if (direction == PF_IN) {
4429 pf_change_icmp(pd2.src, &th.th_sport,
4430 daddr, &(*state)->lan.addr,
4431 (*state)->lan.port, NULL,
4432 pd2.ip_sum, icmpsum,
4433 pd->ip_sum, 0, pd2.af);
4435 pf_change_icmp(pd2.dst, &th.th_dport,
4436 saddr, &(*state)->gwy.addr,
4437 (*state)->gwy.port, NULL,
4438 pd2.ip_sum, icmpsum,
4439 pd->ip_sum, 0, pd2.af);
4448 m_copyback(m, off, ICMP_MINLEN,
4449 (caddr_t)pd->hdr.icmp);
4450 m_copyback(m, ipoff2, sizeof(h2),
4457 sizeof(struct icmp6_hdr),
4458 (caddr_t)pd->hdr.icmp6);
4459 m_copyback(m, ipoff2, sizeof(h2_6),
4464 m_copyback(m, off2, 8, (caddr_t)&th);
4472 struct pf_state key;
4474 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
4475 NULL, NULL, pd2.af)) {
4476 DPFPRINTF(PF_DEBUG_MISC,
4477 ("pf: ICMP error message too short "
4483 key.proto = IPPROTO_UDP;
4484 if (direction == PF_IN) {
4485 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4486 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4487 key.ext.port = uh.uh_dport;
4488 key.gwy.port = uh.uh_sport;
4490 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4491 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4492 key.lan.port = uh.uh_dport;
4493 key.ext.port = uh.uh_sport;
4498 if (STATE_TRANSLATE(*state)) {
4499 if (direction == PF_IN) {
4500 pf_change_icmp(pd2.src, &uh.uh_sport,
4501 daddr, &(*state)->lan.addr,
4502 (*state)->lan.port, &uh.uh_sum,
4503 pd2.ip_sum, icmpsum,
4504 pd->ip_sum, 1, pd2.af);
4506 pf_change_icmp(pd2.dst, &uh.uh_dport,
4507 saddr, &(*state)->gwy.addr,
4508 (*state)->gwy.port, &uh.uh_sum,
4509 pd2.ip_sum, icmpsum,
4510 pd->ip_sum, 1, pd2.af);
4515 m_copyback(m, off, ICMP_MINLEN,
4516 (caddr_t)pd->hdr.icmp);
4517 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4523 sizeof(struct icmp6_hdr),
4524 (caddr_t)pd->hdr.icmp6);
4525 m_copyback(m, ipoff2, sizeof(h2_6),
4530 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh);
4537 case IPPROTO_ICMP: {
4539 struct pf_state key;
4541 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
4542 NULL, NULL, pd2.af)) {
4543 DPFPRINTF(PF_DEBUG_MISC,
4544 ("pf: ICMP error message too short i"
4550 key.proto = IPPROTO_ICMP;
4551 if (direction == PF_IN) {
4552 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4553 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4554 key.ext.port = iih.icmp_id;
4555 key.gwy.port = iih.icmp_id;
4557 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4558 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4559 key.lan.port = iih.icmp_id;
4560 key.ext.port = iih.icmp_id;
4565 if (STATE_TRANSLATE(*state)) {
4566 if (direction == PF_IN) {
4567 pf_change_icmp(pd2.src, &iih.icmp_id,
4568 daddr, &(*state)->lan.addr,
4569 (*state)->lan.port, NULL,
4570 pd2.ip_sum, icmpsum,
4571 pd->ip_sum, 0, AF_INET);
4573 pf_change_icmp(pd2.dst, &iih.icmp_id,
4574 saddr, &(*state)->gwy.addr,
4575 (*state)->gwy.port, NULL,
4576 pd2.ip_sum, icmpsum,
4577 pd->ip_sum, 0, AF_INET);
4579 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
4580 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4581 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih);
4589 case IPPROTO_ICMPV6: {
4590 struct icmp6_hdr iih;
4591 struct pf_state key;
4593 if (!pf_pull_hdr(m, off2, &iih,
4594 sizeof(struct icmp6_hdr), NULL, NULL, pd2.af)) {
4595 DPFPRINTF(PF_DEBUG_MISC,
4596 ("pf: ICMP error message too short "
4602 key.proto = IPPROTO_ICMPV6;
4603 if (direction == PF_IN) {
4604 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4605 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4606 key.ext.port = iih.icmp6_id;
4607 key.gwy.port = iih.icmp6_id;
4609 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4610 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4611 key.lan.port = iih.icmp6_id;
4612 key.ext.port = iih.icmp6_id;
4617 if (STATE_TRANSLATE(*state)) {
4618 if (direction == PF_IN) {
4619 pf_change_icmp(pd2.src, &iih.icmp6_id,
4620 daddr, &(*state)->lan.addr,
4621 (*state)->lan.port, NULL,
4622 pd2.ip_sum, icmpsum,
4623 pd->ip_sum, 0, AF_INET6);
4625 pf_change_icmp(pd2.dst, &iih.icmp6_id,
4626 saddr, &(*state)->gwy.addr,
4627 (*state)->gwy.port, NULL,
4628 pd2.ip_sum, icmpsum,
4629 pd->ip_sum, 0, AF_INET6);
4631 m_copyback(m, off, sizeof(struct icmp6_hdr),
4632 (caddr_t)pd->hdr.icmp6);
4633 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6);
4634 m_copyback(m, off2, sizeof(struct icmp6_hdr),
4643 struct pf_state key;
4646 key.proto = pd2.proto;
4647 if (direction == PF_IN) {
4648 PF_ACPY(&key.ext.addr, pd2.dst, key.af);
4649 PF_ACPY(&key.gwy.addr, pd2.src, key.af);
4653 PF_ACPY(&key.lan.addr, pd2.dst, key.af);
4654 PF_ACPY(&key.ext.addr, pd2.src, key.af);
4661 if (STATE_TRANSLATE(*state)) {
4662 if (direction == PF_IN) {
4663 pf_change_icmp(pd2.src, NULL,
4664 daddr, &(*state)->lan.addr,
4666 pd2.ip_sum, icmpsum,
4667 pd->ip_sum, 0, pd2.af);
4669 pf_change_icmp(pd2.dst, NULL,
4670 saddr, &(*state)->gwy.addr,
4672 pd2.ip_sum, icmpsum,
4673 pd->ip_sum, 0, pd2.af);
4678 m_copyback(m, off, ICMP_MINLEN,
4679 (caddr_t)pd->hdr.icmp);
4680 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4686 sizeof(struct icmp6_hdr),
4687 (caddr_t)pd->hdr.icmp6);
4688 m_copyback(m, ipoff2, sizeof(h2_6),
4703 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
4704 struct pf_pdesc *pd)
4706 struct pf_state_peer *src, *dst;
4707 struct pf_state key;
4710 key.proto = pd->proto;
4711 if (direction == PF_IN) {
4712 PF_ACPY(&key.ext.addr, pd->src, key.af);
4713 PF_ACPY(&key.gwy.addr, pd->dst, key.af);
4717 PF_ACPY(&key.lan.addr, pd->src, key.af);
4718 PF_ACPY(&key.ext.addr, pd->dst, key.af);
4725 if (direction == (*state)->direction) {
4726 src = &(*state)->src;
4727 dst = &(*state)->dst;
4729 src = &(*state)->dst;
4730 dst = &(*state)->src;
4734 if (src->state < PFOTHERS_SINGLE)
4735 src->state = PFOTHERS_SINGLE;
4736 if (dst->state == PFOTHERS_SINGLE)
4737 dst->state = PFOTHERS_MULTIPLE;
4739 /* update expire time */
4740 (*state)->expire = time_second;
4741 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
4742 (*state)->timeout = PFTM_OTHER_MULTIPLE;
4744 (*state)->timeout = PFTM_OTHER_SINGLE;
4746 /* translate source/destination address, if necessary */
4747 if (STATE_TRANSLATE(*state)) {
4748 if (direction == PF_OUT)
4752 pf_change_a(&pd->src->v4.s_addr,
4753 pd->ip_sum, (*state)->gwy.addr.v4.s_addr,
4759 PF_ACPY(pd->src, &(*state)->gwy.addr, pd->af);
4767 pf_change_a(&pd->dst->v4.s_addr,
4768 pd->ip_sum, (*state)->lan.addr.v4.s_addr,
4774 PF_ACPY(pd->dst, &(*state)->lan.addr, pd->af);
4784 * ipoff and off are measured from the start of the mbuf chain.
4785 * h must be at "ipoff" on the mbuf chain.
4788 pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
4789 u_short *actionp, u_short *reasonp, sa_family_t af)
4794 struct ip *h = mtod(m, struct ip *);
4795 u_int16_t fragoff = (h->ip_off & IP_OFFMASK) << 3;
4799 ACTION_SET(actionp, PF_PASS);
4801 ACTION_SET(actionp, PF_DROP);
4802 REASON_SET(reasonp, PFRES_FRAG);
4806 if (m->m_pkthdr.len < off + len ||
4807 h->ip_len < off + len) {
4808 ACTION_SET(actionp, PF_DROP);
4809 REASON_SET(reasonp, PFRES_SHORT);
4817 struct ip6_hdr *h = mtod(m, struct ip6_hdr *);
4819 if (m->m_pkthdr.len < off + len ||
4820 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
4821 (unsigned)(off + len)) {
4822 ACTION_SET(actionp, PF_DROP);
4823 REASON_SET(reasonp, PFRES_SHORT);
4830 m_copydata(m, off, len, p);
4835 pf_routable(struct pf_addr *addr, sa_family_t af)
4837 struct sockaddr_in *dst;
4841 bzero(&ro, sizeof(ro));
4842 dst = satosin(&ro.ro_dst);
4843 dst->sin_family = af;
4844 dst->sin_len = sizeof(*dst);
4845 dst->sin_addr = addr->v4;
4846 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING));
4848 if (ro.ro_rt != NULL) {
4858 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
4861 struct mbuf *m0, *m1;
4862 struct route iproute;
4863 struct route *ro = NULL;
4864 struct sockaddr_in *dst;
4866 struct ifnet *ifp = NULL;
4867 struct pf_addr naddr;
4868 struct pf_src_node *sn = NULL;
4872 if (m == NULL || *m == NULL || r == NULL ||
4873 (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
4874 panic("pf_route: invalid parameters");
4876 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
4877 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
4878 (*m)->m_pkthdr.pf_routed = 1;
4880 if ((*m)->m_pkthdr.pf_routed > 3) {
4885 (*m)->m_pkthdr.pf_routed++;
4888 if (r->rt == PF_DUPTO) {
4889 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL)
4892 if ((r->rt == PF_REPLYTO) == (r->direction == dir))
4897 if (m0->m_len < sizeof(struct ip))
4898 panic("pf_route: m0->m_len < sizeof(struct ip)");
4899 ip = mtod(m0, struct ip *);
4902 bzero((caddr_t)ro, sizeof(*ro));
4903 dst = satosin(&ro->ro_dst);
4904 dst->sin_family = AF_INET;
4905 dst->sin_len = sizeof(*dst);
4906 dst->sin_addr = ip->ip_dst;
4908 if (r->rt == PF_FASTROUTE) {
4910 if (ro->ro_rt == 0) {
4911 ipstat.ips_noroute++;
4915 ifp = ro->ro_rt->rt_ifp;
4916 ro->ro_rt->rt_use++;
4918 if (ro->ro_rt->rt_flags & RTF_GATEWAY)
4919 dst = satosin(ro->ro_rt->rt_gateway);
4921 if (TAILQ_EMPTY(&r->rpool.list))
4922 panic("pf_route: TAILQ_EMPTY(&r->rpool.list)");
4924 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
4926 if (!PF_AZERO(&naddr, AF_INET))
4927 dst->sin_addr.s_addr = naddr.v4.s_addr;
4928 ifp = r->rpool.cur->kif ?
4929 r->rpool.cur->kif->pfik_ifp : NULL;
4931 if (!PF_AZERO(&s->rt_addr, AF_INET))
4932 dst->sin_addr.s_addr =
4933 s->rt_addr.v4.s_addr;
4934 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
4941 if (pf_test(PF_OUT, ifp, &m0) != PF_PASS)
4943 else if (m0 == NULL)
4945 if (m0->m_len < sizeof(struct ip))
4946 panic("pf_route: m0->m_len < sizeof(struct ip)");
4947 ip = mtod(m0, struct ip *);
4950 /* Copied from ip_output. */
4951 m0->m_pkthdr.csum_flags |= CSUM_IP;
4952 sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist;
4953 if (sw_csum & CSUM_DELAY_DATA) {
4954 in_delayed_cksum(m0);
4955 sw_csum &= ~CSUM_DELAY_DATA;
4957 m0->m_pkthdr.csum_flags &= ifp->if_hwassist;
4960 * If small enough for interface, or the interface will take
4961 * care of the fragmentation for us, can just send directly.
4963 if (ip->ip_len <= ifp->if_mtu || ((ifp->if_hwassist & CSUM_FRAGMENT) &&
4964 (ip->ip_off & IP_DF) == 0)) {
4965 ip->ip_len = htons(ip->ip_len);
4966 ip->ip_off = htons(ip->ip_off);
4968 if (sw_csum & CSUM_DELAY_IP) {
4970 if (ip->ip_v == IPVERSION &&
4971 (ip->ip_hl << 2) == sizeof(*ip)) {
4972 ip->ip_sum = in_cksum_hdr(ip);
4974 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
4978 lwkt_serialize_enter(ifp->if_serializer);
4979 error = (*ifp->if_output)(ifp, m0, sintosa(dst), ro->ro_rt);
4980 lwkt_serialize_exit(ifp->if_serializer);
4985 * Too large for interface; fragment if possible.
4986 * Must be able to put at least 8 bytes per fragment.
4988 if (ip->ip_off & IP_DF) {
4989 ipstat.ips_cantfrag++;
4990 if (r->rt != PF_DUPTO) {
4991 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
4999 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum);
5003 for (m0 = m1; m0; m0 = m1) {
5007 lwkt_serialize_enter(ifp->if_serializer);
5008 error = (*ifp->if_output)(ifp, m0, sintosa(dst),
5010 lwkt_serialize_exit(ifp->if_serializer);
5017 ipstat.ips_fragmented++;
5020 if (r->rt != PF_DUPTO)
5022 if (ro == &iproute && ro->ro_rt)
5034 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5038 struct route_in6 ip6route;
5039 struct route_in6 *ro;
5040 struct sockaddr_in6 *dst;
5041 struct ip6_hdr *ip6;
5042 struct ifnet *ifp = NULL;
5043 struct pf_addr naddr;
5044 struct pf_src_node *sn = NULL;
5047 if (m == NULL || *m == NULL || r == NULL ||
5048 (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
5049 panic("pf_route6: invalid parameters");
5051 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
5052 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
5053 (*m)->m_pkthdr.pf_routed = 1;
5055 if ((*m)->m_pkthdr.pf_routed > 3) {
5060 (*m)->m_pkthdr.pf_routed++;
5063 if (r->rt == PF_DUPTO) {
5064 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL)
5067 if ((r->rt == PF_REPLYTO) == (r->direction == dir))
5072 if (m0->m_len < sizeof(struct ip6_hdr))
5073 panic("pf_route6: m0->m_len < sizeof(struct ip6_hdr)");
5074 ip6 = mtod(m0, struct ip6_hdr *);
5077 bzero((caddr_t)ro, sizeof(*ro));
5078 dst = (struct sockaddr_in6 *)&ro->ro_dst;
5079 dst->sin6_family = AF_INET6;
5080 dst->sin6_len = sizeof(*dst);
5081 dst->sin6_addr = ip6->ip6_dst;
5084 if (r->rt == PF_FASTROUTE) {
5085 m0->m_pkthdr.fw_flags |= PF_MBUF_GENERATED;
5086 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL);
5090 if (TAILQ_EMPTY(&r->rpool.list))
5091 panic("pf_route6: TAILQ_EMPTY(&r->rpool.list)");
5093 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
5095 if (!PF_AZERO(&naddr, AF_INET6))
5096 PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5098 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
5100 if (!PF_AZERO(&s->rt_addr, AF_INET6))
5101 PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5102 &s->rt_addr, AF_INET6);
5103 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5109 if (pf_test6(PF_OUT, ifp, &m0) != PF_PASS)
5111 else if (m0 == NULL)
5113 if (m0->m_len < sizeof(struct ip6_hdr))
5114 panic("pf_route6: m0->m_len < sizeof(struct ip6_hdr)");
5115 ip6 = mtod(m0, struct ip6_hdr *);
5119 * If the packet is too large for the outgoing interface,
5120 * send back an icmp6 error.
5122 if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr))
5123 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
5124 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) {
5125 error = nd6_output(ifp, ifp, m0, dst, NULL);
5127 in6_ifstat_inc(ifp, ifs6_in_toobig);
5128 if (r->rt != PF_DUPTO)
5129 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
5135 if (r->rt != PF_DUPTO)
5147 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag
5148 * off is the offset where the protocol header starts
5149 * len is the total length of protocol header plus payload
5150 * returns 0 when the checksum is valid, otherwise returns 1.
5154 * FreeBSD supports cksum offload for the following drivers.
5155 * em(4), gx(4), lge(4), nge(4), ti(4), xl(4)
5156 * If we can make full use of it we would outperform ipfw/ipfilter in
5157 * very heavy traffic.
5158 * I have not tested 'cause I don't have NICs that supports cksum offload.
5159 * (There might be problems. Typical phenomena would be
5160 * 1. No route message for UDP packet.
5161 * 2. No connection acceptance from external hosts regardless of rule set.)
5164 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p,
5171 if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
5173 if (m->m_pkthdr.len < off + len)
5179 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5180 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5181 sum = m->m_pkthdr.csum_data;
5183 ip = mtod(m, struct ip *);
5184 sum = in_pseudo(ip->ip_src.s_addr,
5185 ip->ip_dst.s_addr, htonl((u_short)len +
5186 m->m_pkthdr.csum_data + p));
5194 case IPPROTO_ICMPV6:
5204 if (p == IPPROTO_ICMP) {
5209 sum = in_cksum(m, len);
5213 if (m->m_len < sizeof(struct ip))
5215 sum = in_cksum_range(m, p, off, len);
5217 m->m_pkthdr.csum_flags |=
5220 m->m_pkthdr.csum_data = 0xffff;
5226 if (m->m_len < sizeof(struct ip6_hdr))
5228 sum = in6_cksum(m, p, off, len);
5231 * IPv6 H/W cksum off-load not supported yet!
5234 * m->m_pkthdr.csum_flags |=
5235 * (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
5236 * m->m_pkthdr.csum_data = 0xffff;
5248 tcpstat.tcps_rcvbadsum++;
5251 udpstat.udps_badsum++;
5254 icmpstat.icps_checksum++;
5257 case IPPROTO_ICMPV6:
5258 icmp6stat.icp6s_checksum++;
5269 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0)
5271 struct pfi_kif *kif;
5272 u_short action, reason = 0, log = 0;
5273 struct mbuf *m = *m0;
5274 struct ip *h = NULL;
5275 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr;
5276 struct pf_state *s = NULL;
5277 struct pf_ruleset *ruleset = NULL;
5279 int off, dirndx, pqid = 0;
5281 if (!pf_status.running || (m->m_pkthdr.fw_flags & PF_MBUF_GENERATED))
5284 kif = pfi_index2kif[ifp->if_index];
5289 if ((m->m_flags & M_PKTHDR) == 0)
5290 panic("non-M_PKTHDR is passed to pf_test");
5293 memset(&pd, 0, sizeof(pd));
5294 if (m->m_pkthdr.len < (int)sizeof(*h)) {
5296 REASON_SET(&reason, PFRES_SHORT);
5301 /* We do IP header normalization and packet reassembly here */
5302 if (pf_normalize_ip(m0, dir, kif, &reason) != PF_PASS) {
5307 h = mtod(m, struct ip *);
5309 off = h->ip_hl << 2;
5310 if (off < (int)sizeof(*h)) {
5312 REASON_SET(&reason, PFRES_SHORT);
5317 pd.src = (struct pf_addr *)&h->ip_src;
5318 pd.dst = (struct pf_addr *)&h->ip_dst;
5319 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET);
5320 pd.ip_sum = &h->ip_sum;
5324 pd.tot_len = h->ip_len;
5326 /* handle fragments that didn't get reassembled by normalization */
5327 if (h->ip_off & (IP_MF | IP_OFFMASK)) {
5328 action = pf_test_fragment(&r, dir, kif, m, h,
5339 if (!pf_pull_hdr(m, off, &th, sizeof(th),
5340 &action, &reason, AF_INET)) {
5341 log = action != PF_PASS;
5344 if (dir == PF_IN && pf_check_proto_cksum(m, off,
5345 h->ip_len - off, IPPROTO_TCP, AF_INET)) {
5349 pd.p_len = pd.tot_len - off - (th.th_off << 2);
5350 if ((th.th_flags & TH_ACK) && pd.p_len == 0)
5352 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
5353 if (action == PF_DROP)
5355 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
5357 if (action == PF_PASS) {
5359 pfsync_update_state(s);
5364 } else if (s == NULL)
5365 action = pf_test_tcp(&r, &s, dir, kif,
5366 m, off, h, &pd, &a, &ruleset);
5374 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
5375 &action, &reason, AF_INET)) {
5376 log = action != PF_PASS;
5379 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m,
5380 off, h->ip_len - off, IPPROTO_UDP, AF_INET)) {
5384 if (uh.uh_dport == 0 ||
5385 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
5386 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
5390 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
5391 if (action == PF_PASS) {
5393 pfsync_update_state(s);
5398 } else if (s == NULL)
5399 action = pf_test_udp(&r, &s, dir, kif,
5400 m, off, h, &pd, &a, &ruleset);
5404 case IPPROTO_ICMP: {
5408 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
5409 &action, &reason, AF_INET)) {
5410 log = action != PF_PASS;
5413 if (dir == PF_IN && pf_check_proto_cksum(m, off,
5414 h->ip_len - off, IPPROTO_ICMP, AF_INET)) {
5418 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd);
5419 if (action == PF_PASS) {
5421 pfsync_update_state(s);
5426 } else if (s == NULL)
5427 action = pf_test_icmp(&r, &s, dir, kif,
5428 m, off, h, &pd, &a, &ruleset);
5433 action = pf_test_state_other(&s, dir, kif, &pd);
5434 if (action == PF_PASS) {
5436 pfsync_update_state(s);
5441 } else if (s == NULL)
5442 action = pf_test_other(&r, &s, dir, kif, m, off, h,
5448 if (action == PF_PASS && h->ip_hl > 5 &&
5449 !((s && s->allow_opts) || r->allow_opts)) {
5451 REASON_SET(&reason, PFRES_SHORT);
5453 DPFPRINTF(PF_DEBUG_MISC,
5454 ("pf: dropping packet with ip options\n"));
5458 if (action == PF_PASS && r->qid) {
5459 m->m_pkthdr.fw_flags |= ALTQ_MBUF_TAGGED;
5460 if (pd.tos == IPTOS_LOWDELAY)
5461 m->m_pkthdr.altq_qid = r->pqid;
5463 m->m_pkthdr.altq_qid = r->qid;
5464 m->m_pkthdr.ecn_af = AF_INET;
5465 m->m_pkthdr.header = h;
5470 * connections redirected to loopback should not match sockets
5471 * bound specifically to loopback due to security implications,
5472 * see tcp_input() and in_pcblookup_listen().
5474 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
5475 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
5476 (s->nat_rule.ptr->action == PF_RDR ||
5477 s->nat_rule.ptr->action == PF_BINAT) &&
5478 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
5480 REASON_SET(&reason, PFRES_MEMORY);
5483 m->m_pkthdr.fw_flags |= PF_MBUF_TRANSLATE_LOCALHOST;
5486 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, r, a, ruleset);
5488 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
5489 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;
5491 if (action == PF_PASS || r->action == PF_DROP) {
5493 r->bytes += pd.tot_len;
5496 a->bytes += pd.tot_len;
5499 dirndx = (dir == s->direction) ? 0 : 1;
5500 s->packets[dirndx]++;
5501 s->bytes[dirndx] += pd.tot_len;
5502 if (s->nat_rule.ptr != NULL) {
5503 s->nat_rule.ptr->packets++;
5504 s->nat_rule.ptr->bytes += pd.tot_len;
5506 if (s->src_node != NULL) {
5507 s->src_node->packets++;
5508 s->src_node->bytes += pd.tot_len;
5510 if (s->nat_src_node != NULL) {
5511 s->nat_src_node->packets++;
5512 s->nat_src_node->bytes += pd.tot_len;
5516 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
5520 * XXX: we need to make sure that the addresses
5521 * passed to pfr_update_stats() are the same than
5522 * the addresses used during matching (pfr_match)
5524 if (r == &pf_default_rule) {
5526 x = (s == NULL || s->direction == dir) ?
5527 &pd.baddr : &pd.naddr;
5529 x = (s == NULL || s->direction == dir) ?
5530 &pd.naddr : &pd.baddr;
5531 if (x == &pd.baddr || s == NULL) {
5532 /* we need to change the address */
5539 if (tr->src.addr.type == PF_ADDR_TABLE)
5540 pfr_update_stats(tr->src.addr.p.tbl, (s == NULL ||
5541 s->direction == dir) ? pd.src : pd.dst, pd.af,
5542 pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5544 if (tr->dst.addr.type == PF_ADDR_TABLE)
5545 pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL ||
5546 s->direction == dir) ? pd.dst : pd.src, pd.af,
5547 pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5552 if (action == PF_SYNPROXY_DROP) {
5557 /* pf_route can free the mbuf causing *m0 to become NULL */
5558 pf_route(m0, r, dir, ifp, s);
5566 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0)
5568 struct pfi_kif *kif;
5569 u_short action, reason = 0, log = 0;
5570 struct mbuf *m = *m0;
5571 struct ip6_hdr *h = NULL;
5572 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr;
5573 struct pf_state *s = NULL;
5574 struct pf_ruleset *ruleset = NULL;
5576 int off, terminal = 0, dirndx;
5578 if (!pf_status.running || (m->m_pkthdr.fw_flags & PF_MBUF_GENERATED))
5581 kif = pfi_index2kif[ifp->if_index];
5586 if ((m->m_flags & M_PKTHDR) == 0)
5587 panic("non-M_PKTHDR is passed to pf_test");
5590 memset(&pd, 0, sizeof(pd));
5591 if (m->m_pkthdr.len < (int)sizeof(*h)) {
5593 REASON_SET(&reason, PFRES_SHORT);
5598 /* We do IP header normalization and packet reassembly here */
5599 if (pf_normalize_ip6(m0, dir, kif, &reason) != PF_PASS) {
5604 h = mtod(m, struct ip6_hdr *);
5606 pd.src = (struct pf_addr *)&h->ip6_src;
5607 pd.dst = (struct pf_addr *)&h->ip6_dst;
5608 PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6);
5612 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
5614 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
5615 pd.proto = h->ip6_nxt;
5618 case IPPROTO_FRAGMENT:
5619 action = pf_test_fragment(&r, dir, kif, m, h,
5621 if (action == PF_DROP)
5622 REASON_SET(&reason, PFRES_FRAG);
5625 case IPPROTO_HOPOPTS:
5626 case IPPROTO_ROUTING:
5627 case IPPROTO_DSTOPTS: {
5628 /* get next header and header length */
5629 struct ip6_ext opt6;
5631 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
5632 NULL, NULL, pd.af)) {
5633 DPFPRINTF(PF_DEBUG_MISC,
5634 ("pf: IPv6 short opt\n"));
5636 REASON_SET(&reason, PFRES_SHORT);
5640 if (pd.proto == IPPROTO_AH)
5641 off += (opt6.ip6e_len + 2) * 4;
5643 off += (opt6.ip6e_len + 1) * 8;
5644 pd.proto = opt6.ip6e_nxt;
5645 /* goto the next header */
5652 } while (!terminal);
5660 if (!pf_pull_hdr(m, off, &th, sizeof(th),
5661 &action, &reason, AF_INET6)) {
5662 log = action != PF_PASS;
5665 if (dir == PF_IN && pf_check_proto_cksum(m, off,
5666 ntohs(h->ip6_plen), IPPROTO_TCP, AF_INET6)) {
5670 pd.p_len = pd.tot_len - off - (th.th_off << 2);
5671 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
5672 if (action == PF_DROP)
5674 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
5676 if (action == PF_PASS) {
5678 pfsync_update_state(s);
5683 } else if (s == NULL)
5684 action = pf_test_tcp(&r, &s, dir, kif,
5685 m, off, h, &pd, &a, &ruleset);
5693 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
5694 &action, &reason, AF_INET6)) {
5695 log = action != PF_PASS;
5698 if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m,
5699 off, ntohs(h->ip6_plen), IPPROTO_UDP, AF_INET6)) {
5703 if (uh.uh_dport == 0 ||
5704 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
5705 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
5709 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
5710 if (action == PF_PASS) {
5712 pfsync_update_state(s);
5717 } else if (s == NULL)
5718 action = pf_test_udp(&r, &s, dir, kif,
5719 m, off, h, &pd, &a, &ruleset);
5723 case IPPROTO_ICMPV6: {
5724 struct icmp6_hdr ih;
5727 if (!pf_pull_hdr(m, off, &ih, sizeof(ih),
5728 &action, &reason, AF_INET6)) {
5729 log = action != PF_PASS;
5732 if (dir == PF_IN && pf_check_proto_cksum(m, off,
5733 ntohs(h->ip6_plen), IPPROTO_ICMPV6, AF_INET6)) {
5737 action = pf_test_state_icmp(&s, dir, kif,
5739 if (action == PF_PASS) {
5741 pfsync_update_state(s);
5746 } else if (s == NULL)
5747 action = pf_test_icmp(&r, &s, dir, kif,
5748 m, off, h, &pd, &a, &ruleset);
5753 action = pf_test_state_other(&s, dir, kif, &pd);
5754 if (action == PF_PASS) {
5758 } else if (s == NULL)
5759 action = pf_test_other(&r, &s, dir, kif, m, off, h,
5765 /* XXX handle IPv6 options, if not allowed. not implemented. */
5768 if (action == PF_PASS && r->qid) {
5769 m->m_pkthdr.fw_flags |= ALTQ_MBUF_TAGGED;
5770 if (pd.tos == IPTOS_LOWDELAY)
5771 m->m_pkthdr.altq_qid = r->pqid;
5773 m->m_pkthdr.altq_qid = r->qid;
5774 m->m_pkthdr.ecn_af = AF_INET6;
5775 m->m_pkthdr.header = h;
5779 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
5780 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
5781 (s->nat_rule.ptr->action == PF_RDR ||
5782 s->nat_rule.ptr->action == PF_BINAT) &&
5783 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6)) {
5785 REASON_SET(&reason, PFRES_MEMORY);
5788 m->m_pkthdr.fw_flags |= PF_MBUF_TRANSLATE_LOCALHOST;
5791 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, r, a, ruleset);
5793 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
5794 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;
5796 if (action == PF_PASS || r->action == PF_DROP) {
5798 r->bytes += pd.tot_len;
5801 a->bytes += pd.tot_len;
5804 dirndx = (dir == s->direction) ? 0 : 1;
5805 s->packets[dirndx]++;
5806 s->bytes[dirndx] += pd.tot_len;
5807 if (s->nat_rule.ptr != NULL) {
5808 s->nat_rule.ptr->packets++;
5809 s->nat_rule.ptr->bytes += pd.tot_len;
5811 if (s->src_node != NULL) {
5812 s->src_node->packets++;
5813 s->src_node->bytes += pd.tot_len;
5815 if (s->nat_src_node != NULL) {
5816 s->nat_src_node->packets++;
5817 s->nat_src_node->bytes += pd.tot_len;
5821 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
5825 * XXX: we need to make sure that the addresses
5826 * passed to pfr_update_stats() are the same than
5827 * the addresses used during matching (pfr_match)
5829 if (r == &pf_default_rule) {
5831 x = (s == NULL || s->direction == dir) ?
5832 &pd.baddr : &pd.naddr;
5834 x = (s == NULL || s->direction == dir) ?
5835 &pd.naddr : &pd.baddr;
5837 if (x == &pd.baddr || s == NULL) {
5844 if (tr->src.addr.type == PF_ADDR_TABLE)
5845 pfr_update_stats(tr->src.addr.p.tbl, (s == NULL ||
5846 s->direction == dir) ? pd.src : pd.dst, pd.af,
5847 pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5849 if (tr->dst.addr.type == PF_ADDR_TABLE)
5850 pfr_update_stats(tr->dst.addr.p.tbl, (s == NULL ||
5851 s->direction == dir) ? pd.dst : pd.src, pd.af,
5852 pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
5857 if (action == PF_SYNPROXY_DROP) {
5862 /* pf_route6 can free the mbuf causing *m0 to become NULL */
5863 pf_route6(m0, r, dir, ifp, s);