1 /* $OpenBSD: pf.c,v 1.614 2008/08/02 12:34:37 henning Exp $ */
4 * Copyright (c) 2004 The DragonFly Project. All rights reserved.
6 * Copyright (c) 2001 Daniel Hartmeier
7 * Copyright (c) 2002 - 2008 Henning Brauer
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
14 * - Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * - Redistributions in binary form must reproduce the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer in the documentation and/or other materials provided
19 * with the distribution.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
29 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
31 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 * POSSIBILITY OF SUCH DAMAGE.
34 * Effort sponsored in part by the Defense Advanced Research Projects
35 * Agency (DARPA) and Air Force Research Laboratory, Air Force
36 * Materiel Command, USAF, under agreement number F30602-01-2-0537.
41 #include "opt_inet6.h"
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/malloc.h>
47 #include <sys/filio.h>
48 #include <sys/socket.h>
49 #include <sys/socketvar.h>
50 #include <sys/kernel.h>
52 #include <sys/sysctl.h>
53 #include <sys/endian.h>
55 #include <sys/kthread.h>
57 #include <machine/inttypes.h>
62 #include <net/if_types.h>
64 #include <net/netisr.h>
65 #include <net/route.h>
67 #include <netinet/in.h>
68 #include <netinet/in_var.h>
69 #include <netinet/in_systm.h>
70 #include <netinet/ip.h>
71 #include <netinet/ip_var.h>
72 #include <netinet/tcp.h>
73 #include <netinet/tcp_seq.h>
74 #include <netinet/udp.h>
75 #include <netinet/ip_icmp.h>
76 #include <netinet/in_pcb.h>
77 #include <netinet/tcp_timer.h>
78 #include <netinet/tcp_var.h>
79 #include <netinet/udp_var.h>
80 #include <netinet/icmp_var.h>
81 #include <netinet/if_ether.h>
83 #include <net/pf/pfvar.h>
84 #include <net/pf/if_pflog.h>
86 #include <net/pf/if_pfsync.h>
89 #include <netinet/ip6.h>
90 #include <netinet/in_pcb.h>
91 #include <netinet/icmp6.h>
92 #include <netinet6/nd6.h>
93 #include <netinet6/ip6_var.h>
94 #include <netinet6/in6_pcb.h>
97 #include <sys/in_cksum.h>
98 #include <sys/ucred.h>
99 #include <machine/limits.h>
100 #include <sys/msgport2.h>
101 #include <net/netmsg2.h>
103 extern int ip_optcopy(struct ip *, struct ip *);
104 extern int debug_pfugidhack;
106 struct lwkt_token pf_token = LWKT_TOKEN_INITIALIZER(pf_token);
108 #define DPFPRINTF(n, x) if (pf_status.debug >= (n)) kprintf x
114 /* mask radix tree */
115 struct radix_node_head *pf_maskhead;
118 struct pf_state_tree pf_statetbl;
120 struct pf_altqqueue pf_altqs[2];
121 struct pf_palist pf_pabuf;
122 struct pf_altqqueue *pf_altqs_active;
123 struct pf_altqqueue *pf_altqs_inactive;
124 struct pf_status pf_status;
126 u_int32_t ticket_altqs_active;
127 u_int32_t ticket_altqs_inactive;
128 int altqs_inactive_open;
129 u_int32_t ticket_pabuf;
131 MD5_CTX pf_tcp_secret_ctx;
132 u_char pf_tcp_secret[16];
133 int pf_tcp_secret_init;
136 struct pf_anchor_stackframe {
137 struct pf_ruleset *rs;
139 struct pf_anchor_node *parent;
140 struct pf_anchor *child;
141 } pf_anchor_stack[64];
143 struct malloc_type *pf_src_tree_pl, *pf_rule_pl, *pf_pooladdr_pl;
144 struct malloc_type *pf_state_pl, *pf_state_key_pl, *pf_state_item_pl;
145 struct malloc_type *pf_altq_pl;
147 void pf_print_host(struct pf_addr *, u_int16_t, u_int8_t);
149 void pf_init_threshold(struct pf_threshold *, u_int32_t,
151 void pf_add_threshold(struct pf_threshold *);
152 int pf_check_threshold(struct pf_threshold *);
154 void pf_change_ap(struct pf_addr *, u_int16_t *,
155 u_int16_t *, u_int16_t *, struct pf_addr *,
156 u_int16_t, u_int8_t, sa_family_t);
157 int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *,
158 struct tcphdr *, struct pf_state_peer *);
160 void pf_change_a6(struct pf_addr *, u_int16_t *,
161 struct pf_addr *, u_int8_t);
163 void pf_change_icmp(struct pf_addr *, u_int16_t *,
164 struct pf_addr *, struct pf_addr *, u_int16_t,
165 u_int16_t *, u_int16_t *, u_int16_t *,
166 u_int16_t *, u_int8_t, sa_family_t);
167 void pf_send_tcp(const struct pf_rule *, sa_family_t,
168 const struct pf_addr *, const struct pf_addr *,
169 u_int16_t, u_int16_t, u_int32_t, u_int32_t,
170 u_int8_t, u_int16_t, u_int16_t, u_int8_t, int,
171 u_int16_t, struct ether_header *, struct ifnet *);
172 void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
173 sa_family_t, struct pf_rule *);
174 struct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *,
175 int, int, struct pfi_kif *,
176 struct pf_addr *, u_int16_t, struct pf_addr *,
178 struct pf_rule *pf_get_translation(struct pf_pdesc *, struct mbuf *,
179 int, int, struct pfi_kif *, struct pf_src_node **,
180 struct pf_state_key **, struct pf_state_key **,
181 struct pf_state_key **, struct pf_state_key **,
182 struct pf_addr *, struct pf_addr *,
183 u_int16_t, u_int16_t);
184 void pf_detach_state(struct pf_state *);
185 int pf_state_key_setup(struct pf_pdesc *, struct pf_rule *,
186 struct pf_state_key **, struct pf_state_key **,
187 struct pf_state_key **, struct pf_state_key **,
188 struct pf_addr *, struct pf_addr *,
189 u_int16_t, u_int16_t);
190 void pf_state_key_detach(struct pf_state *, int);
191 u_int32_t pf_tcp_iss(struct pf_pdesc *);
192 int pf_test_rule(struct pf_rule **, struct pf_state **,
193 int, struct pfi_kif *, struct mbuf *, int,
194 void *, struct pf_pdesc *, struct pf_rule **,
195 struct pf_ruleset **, struct ifqueue *, struct inpcb *);
196 static __inline int pf_create_state(struct pf_rule *, struct pf_rule *,
197 struct pf_rule *, struct pf_pdesc *,
198 struct pf_src_node *, struct pf_state_key *,
199 struct pf_state_key *, struct pf_state_key *,
200 struct pf_state_key *, struct mbuf *, int,
201 u_int16_t, u_int16_t, int *, struct pfi_kif *,
202 struct pf_state **, int, u_int16_t, u_int16_t,
204 int pf_test_fragment(struct pf_rule **, int,
205 struct pfi_kif *, struct mbuf *, void *,
206 struct pf_pdesc *, struct pf_rule **,
207 struct pf_ruleset **);
208 int pf_tcp_track_full(struct pf_state_peer *,
209 struct pf_state_peer *, struct pf_state **,
210 struct pfi_kif *, struct mbuf *, int,
211 struct pf_pdesc *, u_short *, int *);
212 int pf_tcp_track_sloppy(struct pf_state_peer *,
213 struct pf_state_peer *, struct pf_state **,
214 struct pf_pdesc *, u_short *);
215 int pf_test_state_tcp(struct pf_state **, int,
216 struct pfi_kif *, struct mbuf *, int,
217 void *, struct pf_pdesc *, u_short *);
218 int pf_test_state_udp(struct pf_state **, int,
219 struct pfi_kif *, struct mbuf *, int,
220 void *, struct pf_pdesc *);
221 int pf_test_state_icmp(struct pf_state **, int,
222 struct pfi_kif *, struct mbuf *, int,
223 void *, struct pf_pdesc *, u_short *);
224 int pf_test_state_other(struct pf_state **, int,
225 struct pfi_kif *, struct mbuf *, struct pf_pdesc *);
226 void pf_step_into_anchor(int *, struct pf_ruleset **, int,
227 struct pf_rule **, struct pf_rule **, int *);
228 int pf_step_out_of_anchor(int *, struct pf_ruleset **,
229 int, struct pf_rule **, struct pf_rule **,
231 void pf_hash(struct pf_addr *, struct pf_addr *,
232 struct pf_poolhashkey *, sa_family_t);
233 int pf_map_addr(u_int8_t, struct pf_rule *,
234 struct pf_addr *, struct pf_addr *,
235 struct pf_addr *, struct pf_src_node **);
236 int pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *,
237 struct pf_addr *, struct pf_addr *, u_int16_t,
238 struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t,
239 struct pf_src_node **);
240 void pf_route(struct mbuf **, struct pf_rule *, int,
241 struct ifnet *, struct pf_state *,
243 void pf_route6(struct mbuf **, struct pf_rule *, int,
244 struct ifnet *, struct pf_state *,
246 u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t,
248 u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t,
250 u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t,
252 void pf_set_rt_ifp(struct pf_state *,
254 int pf_check_proto_cksum(struct mbuf *, int, int,
255 u_int8_t, sa_family_t);
256 struct pf_divert *pf_get_divert(struct mbuf *);
257 void pf_print_state_parts(struct pf_state *,
258 struct pf_state_key *, struct pf_state_key *);
259 int pf_addr_wrap_neq(struct pf_addr_wrap *,
260 struct pf_addr_wrap *);
261 struct pf_state *pf_find_state(struct pfi_kif *,
262 struct pf_state_key_cmp *, u_int, struct mbuf *);
263 int pf_src_connlimit(struct pf_state **);
264 int pf_check_congestion(struct ifqueue *);
266 extern int pf_end_threads;
268 struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = {
269 { &pf_state_pl, PFSTATE_HIWAT },
270 { &pf_src_tree_pl, PFSNODE_HIWAT },
271 { &pf_frent_pl, PFFRAG_FRENT_HIWAT },
272 { &pfr_ktable_pl, PFR_KTABLE_HIWAT },
273 { &pfr_kentry_pl, PFR_KENTRY_HIWAT }
276 #define STATE_LOOKUP(i, k, d, s, m) \
278 s = pf_find_state(i, k, d, m); \
279 if (s == NULL || (s)->timeout == PFTM_PURGE) \
282 (((s)->rule.ptr->rt == PF_ROUTETO && \
283 (s)->rule.ptr->direction == PF_OUT) || \
284 ((s)->rule.ptr->rt == PF_REPLYTO && \
285 (s)->rule.ptr->direction == PF_IN)) && \
286 (s)->rt_kif != NULL && \
291 #define BOUND_IFACE(r, k) \
292 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : pfi_all
294 #define STATE_INC_COUNTERS(s) \
296 s->rule.ptr->states_cur++; \
297 s->rule.ptr->states_tot++; \
298 if (s->anchor.ptr != NULL) { \
299 s->anchor.ptr->states_cur++; \
300 s->anchor.ptr->states_tot++; \
302 if (s->nat_rule.ptr != NULL) { \
303 s->nat_rule.ptr->states_cur++; \
304 s->nat_rule.ptr->states_tot++; \
308 #define STATE_DEC_COUNTERS(s) \
310 if (s->nat_rule.ptr != NULL) \
311 s->nat_rule.ptr->states_cur--; \
312 if (s->anchor.ptr != NULL) \
313 s->anchor.ptr->states_cur--; \
314 s->rule.ptr->states_cur--; \
317 static MALLOC_DEFINE(M_PFSTATEPL, "pfstatepl", "pf state pool list");
318 static MALLOC_DEFINE(M_PFSRCTREEPL, "pfsrctpl", "pf source tree pool list");
319 static MALLOC_DEFINE(M_PFSTATEKEYPL, "pfstatekeypl", "pf state key pool list");
320 static MALLOC_DEFINE(M_PFSTATEITEMPL, "pfstateitempl", "pf state item pool list");
322 static __inline int pf_src_compare(struct pf_src_node *, struct pf_src_node *);
323 static __inline int pf_state_compare_key(struct pf_state_key *,
324 struct pf_state_key *);
325 static __inline int pf_state_compare_id(struct pf_state *,
328 struct pf_src_tree tree_src_tracking;
330 struct pf_state_tree_id tree_id;
331 struct pf_state_queue state_list;
333 RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare);
334 RB_GENERATE(pf_state_tree, pf_state_key, entry, pf_state_compare_key);
335 RB_GENERATE(pf_state_tree_id, pf_state,
336 entry_id, pf_state_compare_id);
339 pf_src_compare(struct pf_src_node *a, struct pf_src_node *b)
343 if (a->rule.ptr > b->rule.ptr)
345 if (a->rule.ptr < b->rule.ptr)
347 if ((diff = a->af - b->af) != 0)
352 if (a->addr.addr32[0] > b->addr.addr32[0])
354 if (a->addr.addr32[0] < b->addr.addr32[0])
360 if (a->addr.addr32[3] > b->addr.addr32[3])
362 if (a->addr.addr32[3] < b->addr.addr32[3])
364 if (a->addr.addr32[2] > b->addr.addr32[2])
366 if (a->addr.addr32[2] < b->addr.addr32[2])
368 if (a->addr.addr32[1] > b->addr.addr32[1])
370 if (a->addr.addr32[1] < b->addr.addr32[1])
372 if (a->addr.addr32[0] > b->addr.addr32[0])
374 if (a->addr.addr32[0] < b->addr.addr32[0])
383 pf_state_hash(struct pf_state_key *sk)
385 u_int32_t hv = (u_int32_t)(((intptr_t)sk >> 6) ^ ((intptr_t)sk >> 15));
386 if (hv == 0) /* disallow 0 */
393 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
398 dst->addr32[0] = src->addr32[0];
402 dst->addr32[0] = src->addr32[0];
403 dst->addr32[1] = src->addr32[1];
404 dst->addr32[2] = src->addr32[2];
405 dst->addr32[3] = src->addr32[3];
412 pf_init_threshold(struct pf_threshold *threshold,
413 u_int32_t limit, u_int32_t seconds)
415 threshold->limit = limit * PF_THRESHOLD_MULT;
416 threshold->seconds = seconds;
417 threshold->count = 0;
418 threshold->last = time_second;
422 pf_add_threshold(struct pf_threshold *threshold)
424 u_int32_t t = time_second, diff = t - threshold->last;
426 if (diff >= threshold->seconds)
427 threshold->count = 0;
429 threshold->count -= threshold->count * diff /
431 threshold->count += PF_THRESHOLD_MULT;
436 pf_check_threshold(struct pf_threshold *threshold)
438 return (threshold->count > threshold->limit);
442 pf_src_connlimit(struct pf_state **state)
446 (*state)->src_node->conn++;
447 (*state)->src.tcp_est = 1;
448 pf_add_threshold(&(*state)->src_node->conn_rate);
450 if ((*state)->rule.ptr->max_src_conn &&
451 (*state)->rule.ptr->max_src_conn <
452 (*state)->src_node->conn) {
453 pf_status.lcounters[LCNT_SRCCONN]++;
457 if ((*state)->rule.ptr->max_src_conn_rate.limit &&
458 pf_check_threshold(&(*state)->src_node->conn_rate)) {
459 pf_status.lcounters[LCNT_SRCCONNRATE]++;
466 if ((*state)->rule.ptr->overload_tbl) {
468 u_int32_t killed = 0;
470 pf_status.lcounters[LCNT_OVERLOAD_TABLE]++;
471 if (pf_status.debug >= PF_DEBUG_MISC) {
472 kprintf("pf_src_connlimit: blocking address ");
473 pf_print_host(&(*state)->src_node->addr, 0,
474 (*state)->key[PF_SK_WIRE]->af);
477 bzero(&p, sizeof(p));
478 p.pfra_af = (*state)->key[PF_SK_WIRE]->af;
479 switch ((*state)->key[PF_SK_WIRE]->af) {
483 p.pfra_ip4addr = (*state)->src_node->addr.v4;
489 p.pfra_ip6addr = (*state)->src_node->addr.v6;
494 pfr_insert_kentry((*state)->rule.ptr->overload_tbl,
497 /* kill existing states if that's required. */
498 if ((*state)->rule.ptr->flush) {
499 struct pf_state_key *sk;
502 pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++;
503 RB_FOREACH(st, pf_state_tree_id, &tree_id) {
504 sk = st->key[PF_SK_WIRE];
506 * Kill states from this source. (Only those
507 * from the same rule if PF_FLUSH_GLOBAL is not
511 (*state)->key[PF_SK_WIRE]->af &&
512 (((*state)->direction == PF_OUT &&
513 PF_AEQ(&(*state)->src_node->addr,
514 &sk->addr[0], sk->af)) ||
515 ((*state)->direction == PF_IN &&
516 PF_AEQ(&(*state)->src_node->addr,
517 &sk->addr[1], sk->af))) &&
518 ((*state)->rule.ptr->flush &
520 (*state)->rule.ptr == st->rule.ptr)) {
521 st->timeout = PFTM_PURGE;
522 st->src.state = st->dst.state =
527 if (pf_status.debug >= PF_DEBUG_MISC)
528 kprintf(", %u states killed", killed);
530 if (pf_status.debug >= PF_DEBUG_MISC)
534 /* kill this state */
535 (*state)->timeout = PFTM_PURGE;
536 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
541 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
542 struct pf_addr *src, sa_family_t af)
544 struct pf_src_node k;
548 PF_ACPY(&k.addr, src, af);
549 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
550 rule->rpool.opts & PF_POOL_STICKYADDR)
554 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
555 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
558 if (!rule->max_src_nodes ||
559 rule->src_nodes < rule->max_src_nodes)
560 (*sn) = kmalloc(sizeof(struct pf_src_node), M_PFSRCTREEPL, M_NOWAIT|M_ZERO);
562 pf_status.lcounters[LCNT_SRCNODES]++;
566 pf_init_threshold(&(*sn)->conn_rate,
567 rule->max_src_conn_rate.limit,
568 rule->max_src_conn_rate.seconds);
571 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
572 rule->rpool.opts & PF_POOL_STICKYADDR)
573 (*sn)->rule.ptr = rule;
575 (*sn)->rule.ptr = NULL;
576 PF_ACPY(&(*sn)->addr, src, af);
577 if (RB_INSERT(pf_src_tree,
578 &tree_src_tracking, *sn) != NULL) {
579 if (pf_status.debug >= PF_DEBUG_MISC) {
580 kprintf("pf: src_tree insert failed: ");
581 pf_print_host(&(*sn)->addr, 0, af);
584 kfree(*sn, M_PFSRCTREEPL);
587 (*sn)->creation = time_second;
588 (*sn)->ruletype = rule->action;
589 if ((*sn)->rule.ptr != NULL)
590 (*sn)->rule.ptr->src_nodes++;
591 pf_status.scounters[SCNT_SRC_NODE_INSERT]++;
592 pf_status.src_nodes++;
594 if (rule->max_src_states &&
595 (*sn)->states >= rule->max_src_states) {
596 pf_status.lcounters[LCNT_SRCSTATES]++;
603 /* state table stuff */
606 pf_state_compare_key(struct pf_state_key *a, struct pf_state_key *b)
610 if ((diff = a->proto - b->proto) != 0)
612 if ((diff = a->af - b->af) != 0)
617 if (a->addr[0].addr32[0] > b->addr[0].addr32[0])
619 if (a->addr[0].addr32[0] < b->addr[0].addr32[0])
621 if (a->addr[1].addr32[0] > b->addr[1].addr32[0])
623 if (a->addr[1].addr32[0] < b->addr[1].addr32[0])
629 if (a->addr[0].addr32[3] > b->addr[0].addr32[3])
631 if (a->addr[0].addr32[3] < b->addr[0].addr32[3])
633 if (a->addr[1].addr32[3] > b->addr[1].addr32[3])
635 if (a->addr[1].addr32[3] < b->addr[1].addr32[3])
637 if (a->addr[0].addr32[2] > b->addr[0].addr32[2])
639 if (a->addr[0].addr32[2] < b->addr[0].addr32[2])
641 if (a->addr[1].addr32[2] > b->addr[1].addr32[2])
643 if (a->addr[1].addr32[2] < b->addr[1].addr32[2])
645 if (a->addr[0].addr32[1] > b->addr[0].addr32[1])
647 if (a->addr[0].addr32[1] < b->addr[0].addr32[1])
649 if (a->addr[1].addr32[1] > b->addr[1].addr32[1])
651 if (a->addr[1].addr32[1] < b->addr[1].addr32[1])
653 if (a->addr[0].addr32[0] > b->addr[0].addr32[0])
655 if (a->addr[0].addr32[0] < b->addr[0].addr32[0])
657 if (a->addr[1].addr32[0] > b->addr[1].addr32[0])
659 if (a->addr[1].addr32[0] < b->addr[1].addr32[0])
665 if ((diff = a->port[0] - b->port[0]) != 0)
667 if ((diff = a->port[1] - b->port[1]) != 0)
674 pf_state_compare_id(struct pf_state *a, struct pf_state *b)
680 if (a->creatorid > b->creatorid)
682 if (a->creatorid < b->creatorid)
689 pf_state_key_attach(struct pf_state_key *sk, struct pf_state *s, int idx)
691 struct pf_state_item *si;
692 struct pf_state_key *cur;
694 KKASSERT(s->key[idx] == NULL); /* XXX handle this? */
696 if ((cur = RB_INSERT(pf_state_tree, &pf_statetbl, sk)) != NULL) {
697 /* key exists. check for same kif, if none, add to key */
698 TAILQ_FOREACH(si, &cur->states, entry)
699 if (si->s->kif == s->kif &&
700 si->s->direction == s->direction) {
701 if (pf_status.debug >= PF_DEBUG_MISC) {
703 "pf: %s key attach failed on %s: ",
704 (idx == PF_SK_WIRE) ?
707 pf_print_state_parts(s,
708 (idx == PF_SK_WIRE) ? sk : NULL,
709 (idx == PF_SK_STACK) ? sk : NULL);
712 kfree(sk, M_PFSTATEKEYPL);
713 return (-1); /* collision! */
715 kfree(sk, M_PFSTATEKEYPL);
721 if ((si = kmalloc(sizeof(struct pf_state_item), M_PFSTATEITEMPL, M_NOWAIT)) == NULL) {
722 pf_state_key_detach(s, idx);
727 /* list is sorted, if-bound states before floating */
728 if (s->kif == pfi_all)
729 TAILQ_INSERT_TAIL(&s->key[idx]->states, si, entry);
731 TAILQ_INSERT_HEAD(&s->key[idx]->states, si, entry);
736 pf_detach_state(struct pf_state *s)
738 if (s->key[PF_SK_WIRE] == s->key[PF_SK_STACK])
739 s->key[PF_SK_WIRE] = NULL;
741 if (s->key[PF_SK_STACK] != NULL)
742 pf_state_key_detach(s, PF_SK_STACK);
744 if (s->key[PF_SK_WIRE] != NULL)
745 pf_state_key_detach(s, PF_SK_WIRE);
749 pf_state_key_detach(struct pf_state *s, int idx)
751 struct pf_state_item *si;
752 si = TAILQ_FIRST(&s->key[idx]->states);
753 while (si && si->s != s)
754 si = TAILQ_NEXT(si, entry);
757 TAILQ_REMOVE(&s->key[idx]->states, si, entry);
758 kfree(si, M_PFSTATEITEMPL);
761 if (TAILQ_EMPTY(&s->key[idx]->states)) {
762 RB_REMOVE(pf_state_tree, &pf_statetbl, s->key[idx]);
763 if (s->key[idx]->reverse)
764 s->key[idx]->reverse->reverse = NULL;
765 if (s->key[idx]->inp)
766 s->key[idx]->inp->inp_pf_sk = NULL;
767 kfree(s->key[idx], M_PFSTATEKEYPL);
772 struct pf_state_key *
773 pf_alloc_state_key(int pool_flags)
775 struct pf_state_key *sk;
777 if ((sk = kmalloc(sizeof(struct pf_state_key), M_PFSTATEKEYPL, pool_flags)) == NULL)
779 TAILQ_INIT(&sk->states);
785 pf_state_key_setup(struct pf_pdesc *pd, struct pf_rule *nr,
786 struct pf_state_key **skw, struct pf_state_key **sks,
787 struct pf_state_key **skp, struct pf_state_key **nkp,
788 struct pf_addr *saddr, struct pf_addr *daddr,
789 u_int16_t sport, u_int16_t dport)
791 KKASSERT((*skp == NULL && *nkp == NULL));
793 if ((*skp = pf_alloc_state_key(M_NOWAIT | M_ZERO)) == NULL)
796 PF_ACPY(&(*skp)->addr[pd->sidx], saddr, pd->af);
797 PF_ACPY(&(*skp)->addr[pd->didx], daddr, pd->af);
798 (*skp)->port[pd->sidx] = sport;
799 (*skp)->port[pd->didx] = dport;
800 (*skp)->proto = pd->proto;
804 if ((*nkp = pf_alloc_state_key(M_NOWAIT | M_ZERO)) == NULL)
805 return (ENOMEM); /* caller must handle cleanup */
807 /* XXX maybe just bcopy and TAILQ_INIT(&(*nkp)->states) */
808 PF_ACPY(&(*nkp)->addr[0], &(*skp)->addr[0], pd->af);
809 PF_ACPY(&(*nkp)->addr[1], &(*skp)->addr[1], pd->af);
810 (*nkp)->port[0] = (*skp)->port[0];
811 (*nkp)->port[1] = (*skp)->port[1];
812 (*nkp)->proto = pd->proto;
817 if (pd->dir == PF_IN) {
829 pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw,
830 struct pf_state_key *sks, struct pf_state *s)
835 if (pf_state_key_attach(skw, s, PF_SK_WIRE))
837 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE];
839 if (pf_state_key_attach(skw, s, PF_SK_WIRE)) {
840 kfree(sks, M_PFSTATEKEYPL);
843 if (pf_state_key_attach(sks, s, PF_SK_STACK)) {
844 pf_state_key_detach(s, PF_SK_WIRE);
849 if (s->id == 0 && s->creatorid == 0) {
850 s->id = htobe64(pf_status.stateid++);
851 s->creatorid = pf_status.hostid;
855 * Calculate hash code for altq
857 s->hash = crc32(s->key[PF_SK_WIRE], sizeof(*sks));
859 if (RB_INSERT(pf_state_tree_id, &tree_id, s) != NULL) {
860 if (pf_status.debug >= PF_DEBUG_MISC) {
861 kprintf("pf: state insert failed: "
862 "id: %016jx creatorid: %08x",
863 (uintmax_t)be64toh(s->id), ntohl(s->creatorid));
864 if (s->sync_flags & PFSTATE_FROMSYNC)
865 kprintf(" (from sync)");
871 TAILQ_INSERT_TAIL(&state_list, s, entry_list);
872 pf_status.fcounters[FCNT_STATE_INSERT]++;
874 pfi_kif_ref(kif, PFI_KIF_REF_STATE);
875 pfsync_insert_state(s);
880 pf_find_state_byid(struct pf_state_cmp *key)
882 pf_status.fcounters[FCNT_STATE_SEARCH]++;
884 return (RB_FIND(pf_state_tree_id, &tree_id, (struct pf_state *)key));
888 pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir,
891 struct pf_state_key *sk;
892 struct pf_state_item *si;
894 pf_status.fcounters[FCNT_STATE_SEARCH]++;
896 if (dir == PF_OUT && m->m_pkthdr.pf.statekey &&
897 ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse)
898 sk = ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse;
900 if ((sk = RB_FIND(pf_state_tree, &pf_statetbl,
901 (struct pf_state_key *)key)) == NULL)
903 if (dir == PF_OUT && m->m_pkthdr.pf.statekey) {
904 ((struct pf_state_key *)
905 m->m_pkthdr.pf.statekey)->reverse = sk;
906 sk->reverse = m->m_pkthdr.pf.statekey;
911 m->m_pkthdr.pf.statekey = NULL;
913 /* list is sorted, if-bound states before floating ones */
914 TAILQ_FOREACH(si, &sk->states, entry)
915 if ((si->s->kif == pfi_all || si->s->kif == kif) &&
916 sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] :
917 si->s->key[PF_SK_STACK]))
924 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more)
926 struct pf_state_key *sk;
927 struct pf_state_item *si, *ret = NULL;
929 pf_status.fcounters[FCNT_STATE_SEARCH]++;
931 sk = RB_FIND(pf_state_tree, &pf_statetbl, (struct pf_state_key *)key);
934 TAILQ_FOREACH(si, &sk->states, entry)
935 if (dir == PF_INOUT ||
936 (sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] :
937 si->s->key[PF_SK_STACK]))) {
947 return (ret ? ret->s : NULL);
950 /* END state table stuff */
954 pf_purge_thread(void *v)
959 lwkt_gettoken(&pf_token);
961 tsleep(pf_purge_thread, PWAIT, "pftm", 1 * hz);
963 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
965 if (pf_end_threads) {
966 pf_purge_expired_states(pf_status.states, 0);
967 pf_purge_expired_fragments();
968 pf_purge_expired_src_nodes(1);
971 lockmgr(&pf_consistency_lock, LK_RELEASE);
972 wakeup(pf_purge_thread);
977 /* process a fraction of the state table every second */
978 if(!pf_purge_expired_states(1 + (pf_status.states
979 / pf_default_rule.timeout[PFTM_INTERVAL]), 0)) {
981 pf_purge_expired_states(1 + (pf_status.states
982 / pf_default_rule.timeout[PFTM_INTERVAL]), 1);
985 /* purge other expired types every PFTM_INTERVAL seconds */
986 if (++nloops >= pf_default_rule.timeout[PFTM_INTERVAL]) {
987 pf_purge_expired_fragments();
988 if (!pf_purge_expired_src_nodes(locked)) {
989 pf_purge_expired_src_nodes(1);
994 lockmgr(&pf_consistency_lock, LK_RELEASE);
996 lwkt_reltoken(&pf_token);
1000 pf_state_expires(const struct pf_state *state)
1007 /* handle all PFTM_* > PFTM_MAX here */
1008 if (state->timeout == PFTM_PURGE)
1009 return (time_second);
1010 if (state->timeout == PFTM_UNTIL_PACKET)
1012 KKASSERT(state->timeout != PFTM_UNLINKED);
1013 KKASSERT(state->timeout < PFTM_MAX);
1014 timeout = state->rule.ptr->timeout[state->timeout];
1016 timeout = pf_default_rule.timeout[state->timeout];
1017 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
1019 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
1020 states = state->rule.ptr->states_cur;
1022 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START];
1023 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END];
1024 states = pf_status.states;
1026 if (end && states > start && start < end) {
1028 return (state->expire + timeout * (end - states) /
1031 return (time_second);
1033 return (state->expire + timeout);
1037 pf_purge_expired_src_nodes(int waslocked)
1039 struct pf_src_node *cur, *next;
1040 int locked = waslocked;
1042 for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) {
1043 next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur);
1045 if (cur->states <= 0 && cur->expire <= time_second) {
1047 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
1048 next = RB_NEXT(pf_src_tree,
1049 &tree_src_tracking, cur);
1052 if (cur->rule.ptr != NULL) {
1053 cur->rule.ptr->src_nodes--;
1054 if (cur->rule.ptr->states_cur <= 0 &&
1055 cur->rule.ptr->max_src_nodes <= 0)
1056 pf_rm_rule(NULL, cur->rule.ptr);
1058 RB_REMOVE(pf_src_tree, &tree_src_tracking, cur);
1059 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
1060 pf_status.src_nodes--;
1061 kfree(cur, M_PFSRCTREEPL);
1065 if (locked && !waslocked)
1066 lockmgr(&pf_consistency_lock, LK_RELEASE);
1071 pf_src_tree_remove_state(struct pf_state *s)
1075 if (s->src_node != NULL) {
1077 --s->src_node->conn;
1078 if (--s->src_node->states <= 0) {
1079 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
1082 pf_default_rule.timeout[PFTM_SRC_NODE];
1083 s->src_node->expire = time_second + timeout;
1086 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
1087 if (--s->nat_src_node->states <= 0) {
1088 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
1091 pf_default_rule.timeout[PFTM_SRC_NODE];
1092 s->nat_src_node->expire = time_second + timeout;
1095 s->src_node = s->nat_src_node = NULL;
1098 /* callers should be at crit_enter() */
1100 pf_unlink_state(struct pf_state *cur)
1102 if (cur->src.state == PF_TCPS_PROXY_DST) {
1103 /* XXX wire key the right one? */
1104 pf_send_tcp(cur->rule.ptr, cur->key[PF_SK_WIRE]->af,
1105 &cur->key[PF_SK_WIRE]->addr[1],
1106 &cur->key[PF_SK_WIRE]->addr[0],
1107 cur->key[PF_SK_WIRE]->port[1],
1108 cur->key[PF_SK_WIRE]->port[0],
1109 cur->src.seqhi, cur->src.seqlo + 1,
1110 TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL);
1112 RB_REMOVE(pf_state_tree_id, &tree_id, cur);
1113 if (cur->creatorid == pf_status.hostid)
1114 pfsync_delete_state(cur);
1115 cur->timeout = PFTM_UNLINKED;
1116 pf_src_tree_remove_state(cur);
1117 pf_detach_state(cur);
1120 static struct pf_state *purge_cur;
1122 /* callers should be at crit_enter() and hold the
1123 * write_lock on pf_consistency_lock */
1125 pf_free_state(struct pf_state *cur)
1127 if (pfsyncif != NULL &&
1128 (pfsyncif->sc_bulk_send_next == cur ||
1129 pfsyncif->sc_bulk_terminator == cur))
1131 KKASSERT(cur->timeout == PFTM_UNLINKED);
1132 if (--cur->rule.ptr->states_cur <= 0 &&
1133 cur->rule.ptr->src_nodes <= 0)
1134 pf_rm_rule(NULL, cur->rule.ptr);
1135 if (cur->nat_rule.ptr != NULL)
1136 if (--cur->nat_rule.ptr->states_cur <= 0 &&
1137 cur->nat_rule.ptr->src_nodes <= 0)
1138 pf_rm_rule(NULL, cur->nat_rule.ptr);
1139 if (cur->anchor.ptr != NULL)
1140 if (--cur->anchor.ptr->states_cur <= 0)
1141 pf_rm_rule(NULL, cur->anchor.ptr);
1142 pf_normalize_tcp_cleanup(cur);
1143 pfi_kif_unref(cur->kif, PFI_KIF_REF_STATE);
1146 * We may be freeing pf_purge_expired_states()'s saved scan entry,
1147 * adjust it if necessary.
1149 if (purge_cur == cur) {
1150 kprintf("PURGE CONFLICT\n");
1151 purge_cur = TAILQ_NEXT(purge_cur, entry_list);
1153 TAILQ_REMOVE(&state_list, cur, entry_list);
1155 pf_tag_unref(cur->tag);
1156 kfree(cur, M_PFSTATEPL);
1157 pf_status.fcounters[FCNT_STATE_REMOVALS]++;
1162 pf_purge_expired_states(u_int32_t maxcheck, int waslocked)
1164 struct pf_state *cur;
1165 int locked = waslocked;
1167 while (maxcheck--) {
1169 * Wrap to start of list when we hit the end
1173 cur = TAILQ_FIRST(&state_list);
1175 break; /* list empty */
1179 * Setup next (purge_cur) while we process this one. If we block and
1180 * something else deletes purge_cur, pf_free_state() will adjust it further
1183 purge_cur = TAILQ_NEXT(cur, entry_list);
1185 if (cur->timeout == PFTM_UNLINKED) {
1186 /* free unlinked state */
1188 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
1192 } else if (pf_state_expires(cur) <= time_second) {
1193 /* unlink and free expired state */
1194 pf_unlink_state(cur);
1196 if (!lockmgr(&pf_consistency_lock, LK_EXCLUSIVE))
1205 lockmgr(&pf_consistency_lock, LK_RELEASE);
1210 pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw)
1212 if (aw->type != PF_ADDR_TABLE)
1214 if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL)
1220 pf_tbladdr_remove(struct pf_addr_wrap *aw)
1222 if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL)
1224 pfr_detach_table(aw->p.tbl);
1229 pf_tbladdr_copyout(struct pf_addr_wrap *aw)
1231 struct pfr_ktable *kt = aw->p.tbl;
1233 if (aw->type != PF_ADDR_TABLE || kt == NULL)
1235 if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL)
1236 kt = kt->pfrkt_root;
1238 aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ?
1243 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
1248 u_int32_t a = ntohl(addr->addr32[0]);
1249 kprintf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
1261 u_int8_t i, curstart = 255, curend = 0,
1262 maxstart = 0, maxend = 0;
1263 for (i = 0; i < 8; i++) {
1264 if (!addr->addr16[i]) {
1265 if (curstart == 255)
1271 if ((curend - curstart) >
1272 (maxend - maxstart)) {
1273 maxstart = curstart;
1280 for (i = 0; i < 8; i++) {
1281 if (i >= maxstart && i <= maxend) {
1290 b = ntohs(addr->addr16[i]);
1307 pf_print_state(struct pf_state *s)
1309 pf_print_state_parts(s, NULL, NULL);
1313 pf_print_state_parts(struct pf_state *s,
1314 struct pf_state_key *skwp, struct pf_state_key *sksp)
1316 struct pf_state_key *skw, *sks;
1317 u_int8_t proto, dir;
1319 /* Do our best to fill these, but they're skipped if NULL */
1320 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL);
1321 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL);
1322 proto = skw ? skw->proto : (sks ? sks->proto : 0);
1323 dir = s ? s->direction : 0;
1335 case IPPROTO_ICMPV6:
1339 kprintf("%u ", skw->proto);
1352 pf_print_host(&skw->addr[0], skw->port[0], skw->af);
1354 pf_print_host(&skw->addr[1], skw->port[1], skw->af);
1357 kprintf(" stack: ");
1359 pf_print_host(&sks->addr[0], sks->port[0], sks->af);
1361 pf_print_host(&sks->addr[1], sks->port[1], sks->af);
1366 if (proto == IPPROTO_TCP) {
1367 kprintf(" [lo=%u high=%u win=%u modulator=%u",
1368 s->src.seqlo, s->src.seqhi,
1369 s->src.max_win, s->src.seqdiff);
1370 if (s->src.wscale && s->dst.wscale)
1371 kprintf(" wscale=%u",
1372 s->src.wscale & PF_WSCALE_MASK);
1374 kprintf(" [lo=%u high=%u win=%u modulator=%u",
1375 s->dst.seqlo, s->dst.seqhi,
1376 s->dst.max_win, s->dst.seqdiff);
1377 if (s->src.wscale && s->dst.wscale)
1378 kprintf(" wscale=%u",
1379 s->dst.wscale & PF_WSCALE_MASK);
1382 kprintf(" %u:%u", s->src.state, s->dst.state);
1387 pf_print_flags(u_int8_t f)
1409 #define PF_SET_SKIP_STEPS(i) \
1411 while (head[i] != cur) { \
1412 head[i]->skip[i].ptr = cur; \
1413 head[i] = TAILQ_NEXT(head[i], entries); \
1418 pf_calc_skip_steps(struct pf_rulequeue *rules)
1420 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
1423 cur = TAILQ_FIRST(rules);
1425 for (i = 0; i < PF_SKIP_COUNT; ++i)
1427 while (cur != NULL) {
1429 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
1430 PF_SET_SKIP_STEPS(PF_SKIP_IFP);
1431 if (cur->direction != prev->direction)
1432 PF_SET_SKIP_STEPS(PF_SKIP_DIR);
1433 if (cur->af != prev->af)
1434 PF_SET_SKIP_STEPS(PF_SKIP_AF);
1435 if (cur->proto != prev->proto)
1436 PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
1437 if (cur->src.neg != prev->src.neg ||
1438 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
1439 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
1440 if (cur->src.port[0] != prev->src.port[0] ||
1441 cur->src.port[1] != prev->src.port[1] ||
1442 cur->src.port_op != prev->src.port_op)
1443 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
1444 if (cur->dst.neg != prev->dst.neg ||
1445 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
1446 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
1447 if (cur->dst.port[0] != prev->dst.port[0] ||
1448 cur->dst.port[1] != prev->dst.port[1] ||
1449 cur->dst.port_op != prev->dst.port_op)
1450 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
1453 cur = TAILQ_NEXT(cur, entries);
1455 for (i = 0; i < PF_SKIP_COUNT; ++i)
1456 PF_SET_SKIP_STEPS(i);
1460 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
1462 if (aw1->type != aw2->type)
1464 switch (aw1->type) {
1465 case PF_ADDR_ADDRMASK:
1467 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0))
1469 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0))
1472 case PF_ADDR_DYNIFTL:
1473 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
1474 case PF_ADDR_NOROUTE:
1475 case PF_ADDR_URPFFAILED:
1478 return (aw1->p.tbl != aw2->p.tbl);
1479 case PF_ADDR_RTLABEL:
1480 return (aw1->v.rtlabel != aw2->v.rtlabel);
1482 kprintf("invalid address type: %d\n", aw1->type);
1488 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
1494 l = cksum + old - new;
1495 l = (l >> 16) + (l & 65535);
1503 pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc,
1504 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af)
1509 PF_ACPY(&ao, a, af);
1517 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1518 ao.addr16[0], an->addr16[0], 0),
1519 ao.addr16[1], an->addr16[1], 0);
1521 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1522 ao.addr16[0], an->addr16[0], u),
1523 ao.addr16[1], an->addr16[1], u),
1529 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1530 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1531 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1532 ao.addr16[0], an->addr16[0], u),
1533 ao.addr16[1], an->addr16[1], u),
1534 ao.addr16[2], an->addr16[2], u),
1535 ao.addr16[3], an->addr16[3], u),
1536 ao.addr16[4], an->addr16[4], u),
1537 ao.addr16[5], an->addr16[5], u),
1538 ao.addr16[6], an->addr16[6], u),
1539 ao.addr16[7], an->addr16[7], u),
1547 /* Changes a u_int32_t. Uses a void * so there are no align restrictions */
1549 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
1553 memcpy(&ao, a, sizeof(ao));
1554 memcpy(a, &an, sizeof(u_int32_t));
1555 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
1556 ao % 65536, an % 65536, u);
1561 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
1565 PF_ACPY(&ao, a, AF_INET6);
1566 PF_ACPY(a, an, AF_INET6);
1568 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1569 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1570 pf_cksum_fixup(pf_cksum_fixup(*c,
1571 ao.addr16[0], an->addr16[0], u),
1572 ao.addr16[1], an->addr16[1], u),
1573 ao.addr16[2], an->addr16[2], u),
1574 ao.addr16[3], an->addr16[3], u),
1575 ao.addr16[4], an->addr16[4], u),
1576 ao.addr16[5], an->addr16[5], u),
1577 ao.addr16[6], an->addr16[6], u),
1578 ao.addr16[7], an->addr16[7], u);
1583 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
1584 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
1585 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
1587 struct pf_addr oia, ooa;
1589 PF_ACPY(&oia, ia, af);
1591 PF_ACPY(&ooa, oa, af);
1593 /* Change inner protocol port, fix inner protocol checksum. */
1595 u_int16_t oip = *ip;
1602 *pc = pf_cksum_fixup(*pc, oip, *ip, u);
1603 *ic = pf_cksum_fixup(*ic, oip, *ip, 0);
1605 *ic = pf_cksum_fixup(*ic, opc, *pc, 0);
1607 /* Change inner ip address, fix inner ip and icmp checksums. */
1608 PF_ACPY(ia, na, af);
1612 u_int32_t oh2c = *h2c;
1614 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
1615 oia.addr16[0], ia->addr16[0], 0),
1616 oia.addr16[1], ia->addr16[1], 0);
1617 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1618 oia.addr16[0], ia->addr16[0], 0),
1619 oia.addr16[1], ia->addr16[1], 0);
1620 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
1626 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1627 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1628 pf_cksum_fixup(pf_cksum_fixup(*ic,
1629 oia.addr16[0], ia->addr16[0], u),
1630 oia.addr16[1], ia->addr16[1], u),
1631 oia.addr16[2], ia->addr16[2], u),
1632 oia.addr16[3], ia->addr16[3], u),
1633 oia.addr16[4], ia->addr16[4], u),
1634 oia.addr16[5], ia->addr16[5], u),
1635 oia.addr16[6], ia->addr16[6], u),
1636 oia.addr16[7], ia->addr16[7], u);
1640 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */
1642 PF_ACPY(oa, na, af);
1646 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
1647 ooa.addr16[0], oa->addr16[0], 0),
1648 ooa.addr16[1], oa->addr16[1], 0);
1653 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1654 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1655 pf_cksum_fixup(pf_cksum_fixup(*ic,
1656 ooa.addr16[0], oa->addr16[0], u),
1657 ooa.addr16[1], oa->addr16[1], u),
1658 ooa.addr16[2], oa->addr16[2], u),
1659 ooa.addr16[3], oa->addr16[3], u),
1660 ooa.addr16[4], oa->addr16[4], u),
1661 ooa.addr16[5], oa->addr16[5], u),
1662 ooa.addr16[6], oa->addr16[6], u),
1663 ooa.addr16[7], oa->addr16[7], u);
1672 * Need to modulate the sequence numbers in the TCP SACK option
1673 * (credits to Krzysztof Pfaff for report and patch)
1676 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd,
1677 struct tcphdr *th, struct pf_state_peer *dst)
1679 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen;
1680 u_int8_t opts[TCP_MAXOLEN], *opt = opts;
1681 int copyback = 0, i, olen;
1682 struct raw_sackblock sack;
1684 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2)
1685 if (hlen < TCPOLEN_SACKLEN ||
1686 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af))
1689 while (hlen >= TCPOLEN_SACKLEN) {
1692 case TCPOPT_EOL: /* FALLTHROUGH */
1700 if (olen >= TCPOLEN_SACKLEN) {
1701 for (i = 2; i + TCPOLEN_SACK <= olen;
1702 i += TCPOLEN_SACK) {
1703 memcpy(&sack, &opt[i], sizeof(sack));
1704 pf_change_a(&sack.rblk_start, &th->th_sum,
1705 htonl(ntohl(sack.rblk_start) -
1707 pf_change_a(&sack.rblk_end, &th->th_sum,
1708 htonl(ntohl(sack.rblk_end) -
1710 memcpy(&opt[i], &sack, sizeof(sack));
1724 m_copyback(m, off + sizeof(*th), thoptlen, opts);
1729 pf_send_tcp(const struct pf_rule *r, sa_family_t af,
1730 const struct pf_addr *saddr, const struct pf_addr *daddr,
1731 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
1732 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag,
1733 u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp)
1738 struct ip *h = NULL;
1741 struct ip6_hdr *h6 = NULL;
1743 struct tcphdr *th = NULL;
1746 ASSERT_LWKT_TOKEN_HELD(&pf_token);
1748 /* maximum segment size tcp option */
1749 tlen = sizeof(struct tcphdr);
1756 len = sizeof(struct ip) + tlen;
1761 len = sizeof(struct ip6_hdr) + tlen;
1767 * Create outgoing mbuf.
1769 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
1770 * so make sure pf.flags is clear.
1772 m = m_gethdr(MB_DONTWAIT, MT_HEADER);
1777 m->m_pkthdr.fw_flags |= PF_MBUF_TAGGED;
1778 m->m_pkthdr.pf.flags = 0;
1779 m->m_pkthdr.pf.tag = rtag;
1780 /* XXX Recheck when upgrading to > 4.4 */
1781 m->m_pkthdr.pf.statekey = NULL;
1782 if (r != NULL && r->rtableid >= 0)
1783 m->m_pkthdr.pf.rtableid = r->rtableid;
1786 if (r != NULL && r->qid) {
1787 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
1788 m->m_pkthdr.pf.qid = r->qid;
1789 m->m_pkthdr.pf.ecn_af = af;
1790 m->m_pkthdr.pf.hdr = mtod(m, struct ip *);
1793 m->m_data += max_linkhdr;
1794 m->m_pkthdr.len = m->m_len = len;
1795 m->m_pkthdr.rcvif = NULL;
1796 bzero(m->m_data, len);
1800 h = mtod(m, struct ip *);
1802 /* IP header fields included in the TCP checksum */
1803 h->ip_p = IPPROTO_TCP;
1805 h->ip_src.s_addr = saddr->v4.s_addr;
1806 h->ip_dst.s_addr = daddr->v4.s_addr;
1808 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
1813 h6 = mtod(m, struct ip6_hdr *);
1815 /* IP header fields included in the TCP checksum */
1816 h6->ip6_nxt = IPPROTO_TCP;
1817 h6->ip6_plen = htons(tlen);
1818 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
1819 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
1821 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
1827 th->th_sport = sport;
1828 th->th_dport = dport;
1829 th->th_seq = htonl(seq);
1830 th->th_ack = htonl(ack);
1831 th->th_off = tlen >> 2;
1832 th->th_flags = flags;
1833 th->th_win = htons(win);
1836 opt = (char *)(th + 1);
1837 opt[0] = TCPOPT_MAXSEG;
1840 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
1847 th->th_sum = in_cksum(m, len);
1849 /* Finish the IP header */
1851 h->ip_hl = sizeof(*h) >> 2;
1852 h->ip_tos = IPTOS_LOWDELAY;
1854 h->ip_off = path_mtu_discovery ? IP_DF : 0;
1855 h->ip_ttl = ttl ? ttl : ip_defttl;
1858 lwkt_reltoken(&pf_token);
1859 ip_output(m, NULL, NULL, 0, NULL, NULL);
1860 lwkt_gettoken(&pf_token);
1864 struct ether_header *e = (void *)ro.ro_dst.sa_data;
1872 ro.ro_dst.sa_len = sizeof(ro.ro_dst);
1873 ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT;
1874 bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN);
1875 bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN);
1876 e->ether_type = eh->ether_type;
1877 /* XXX_IMPORT: later */
1878 lwkt_reltoken(&pf_token);
1879 ip_output(m, (void *)NULL, &ro, 0,
1880 (void *)NULL, (void *)NULL);
1881 lwkt_gettoken(&pf_token);
1888 th->th_sum = in6_cksum(m, IPPROTO_TCP,
1889 sizeof(struct ip6_hdr), tlen);
1891 h6->ip6_vfc |= IPV6_VERSION;
1892 h6->ip6_hlim = IPV6_DEFHLIM;
1894 lwkt_reltoken(&pf_token);
1895 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
1896 lwkt_gettoken(&pf_token);
1903 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
1909 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
1910 * so make sure pf.flags is clear.
1912 if ((m0 = m_copy(m, 0, M_COPYALL)) == NULL)
1915 m0->m_pkthdr.fw_flags |= PF_MBUF_TAGGED;
1916 m0->m_pkthdr.pf.flags = 0;
1917 /* XXX Re-Check when Upgrading to > 4.4 */
1918 m0->m_pkthdr.pf.statekey = NULL;
1920 if (r->rtableid >= 0)
1921 m0->m_pkthdr.pf.rtableid = r->rtableid;
1925 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
1926 m0->m_pkthdr.pf.qid = r->qid;
1927 m0->m_pkthdr.pf.ecn_af = af;
1928 m0->m_pkthdr.pf.hdr = mtod(m0, struct ip *);
1935 icmp_error(m0, type, code, 0, 0);
1940 icmp6_error(m0, type, code, 0);
1947 * Return 1 if the addresses a and b match (with mask m), otherwise return 0.
1948 * If n is 0, they match if they are equal. If n is != 0, they match if they
1952 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
1953 struct pf_addr *b, sa_family_t af)
1960 if ((a->addr32[0] & m->addr32[0]) ==
1961 (b->addr32[0] & m->addr32[0]))
1967 if (((a->addr32[0] & m->addr32[0]) ==
1968 (b->addr32[0] & m->addr32[0])) &&
1969 ((a->addr32[1] & m->addr32[1]) ==
1970 (b->addr32[1] & m->addr32[1])) &&
1971 ((a->addr32[2] & m->addr32[2]) ==
1972 (b->addr32[2] & m->addr32[2])) &&
1973 ((a->addr32[3] & m->addr32[3]) ==
1974 (b->addr32[3] & m->addr32[3])))
1993 * Return 1 if b <= a <= e, otherwise return 0.
1996 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e,
1997 struct pf_addr *a, sa_family_t af)
2002 if ((a->addr32[0] < b->addr32[0]) ||
2003 (a->addr32[0] > e->addr32[0]))
2012 for (i = 0; i < 4; ++i)
2013 if (a->addr32[i] > b->addr32[i])
2015 else if (a->addr32[i] < b->addr32[i])
2018 for (i = 0; i < 4; ++i)
2019 if (a->addr32[i] < e->addr32[i])
2021 else if (a->addr32[i] > e->addr32[i])
2031 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
2035 return ((p > a1) && (p < a2));
2037 return ((p < a1) || (p > a2));
2039 return ((p >= a1) && (p <= a2));
2053 return (0); /* never reached */
2057 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
2062 return (pf_match(op, a1, a2, p));
2066 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
2068 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2070 return (pf_match(op, a1, a2, u));
2074 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
2076 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2078 return (pf_match(op, a1, a2, g));
2082 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag)
2085 *tag = m->m_pkthdr.pf.tag;
2087 return ((!r->match_tag_not && r->match_tag == *tag) ||
2088 (r->match_tag_not && r->match_tag != *tag));
2092 pf_tag_packet(struct mbuf *m, int tag, int rtableid)
2094 if (tag <= 0 && rtableid < 0)
2098 m->m_pkthdr.pf.tag = tag;
2100 m->m_pkthdr.pf.rtableid = rtableid;
2106 pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n,
2107 struct pf_rule **r, struct pf_rule **a, int *match)
2109 struct pf_anchor_stackframe *f;
2111 (*r)->anchor->match = 0;
2114 if (*depth >= NELEM(pf_anchor_stack)) {
2115 kprintf("pf_step_into_anchor: stack overflow\n");
2116 *r = TAILQ_NEXT(*r, entries);
2118 } else if (*depth == 0 && a != NULL)
2120 f = pf_anchor_stack + (*depth)++;
2123 if ((*r)->anchor_wildcard) {
2124 f->parent = &(*r)->anchor->children;
2125 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) ==
2130 *rs = &f->child->ruleset;
2134 *rs = &(*r)->anchor->ruleset;
2136 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2140 pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n,
2141 struct pf_rule **r, struct pf_rule **a, int *match)
2143 struct pf_anchor_stackframe *f;
2149 f = pf_anchor_stack + *depth - 1;
2150 if (f->parent != NULL && f->child != NULL) {
2151 if (f->child->match ||
2152 (match != NULL && *match)) {
2153 f->r->anchor->match = 1;
2156 f->child = RB_NEXT(pf_anchor_node, f->parent, f->child);
2157 if (f->child != NULL) {
2158 *rs = &f->child->ruleset;
2159 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2167 if (*depth == 0 && a != NULL)
2170 if (f->r->anchor->match || (match != NULL && *match))
2171 quick = f->r->quick;
2172 *r = TAILQ_NEXT(f->r, entries);
2173 } while (*r == NULL);
2180 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
2181 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
2186 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2187 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2191 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2192 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2193 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
2194 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
2195 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
2196 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
2197 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
2198 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
2204 pf_addr_inc(struct pf_addr *addr, sa_family_t af)
2209 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
2213 if (addr->addr32[3] == 0xffffffff) {
2214 addr->addr32[3] = 0;
2215 if (addr->addr32[2] == 0xffffffff) {
2216 addr->addr32[2] = 0;
2217 if (addr->addr32[1] == 0xffffffff) {
2218 addr->addr32[1] = 0;
2220 htonl(ntohl(addr->addr32[0]) + 1);
2223 htonl(ntohl(addr->addr32[1]) + 1);
2226 htonl(ntohl(addr->addr32[2]) + 1);
2229 htonl(ntohl(addr->addr32[3]) + 1);
2235 #define mix(a,b,c) \
2237 a -= b; a -= c; a ^= (c >> 13); \
2238 b -= c; b -= a; b ^= (a << 8); \
2239 c -= a; c -= b; c ^= (b >> 13); \
2240 a -= b; a -= c; a ^= (c >> 12); \
2241 b -= c; b -= a; b ^= (a << 16); \
2242 c -= a; c -= b; c ^= (b >> 5); \
2243 a -= b; a -= c; a ^= (c >> 3); \
2244 b -= c; b -= a; b ^= (a << 10); \
2245 c -= a; c -= b; c ^= (b >> 15); \
2249 * hash function based on bridge_hash in if_bridge.c
2252 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash,
2253 struct pf_poolhashkey *key, sa_family_t af)
2255 u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0];
2260 a += inaddr->addr32[0];
2263 hash->addr32[0] = c + key->key32[2];
2268 a += inaddr->addr32[0];
2269 b += inaddr->addr32[2];
2271 hash->addr32[0] = c;
2272 a += inaddr->addr32[1];
2273 b += inaddr->addr32[3];
2276 hash->addr32[1] = c;
2277 a += inaddr->addr32[2];
2278 b += inaddr->addr32[1];
2281 hash->addr32[2] = c;
2282 a += inaddr->addr32[3];
2283 b += inaddr->addr32[0];
2286 hash->addr32[3] = c;
2293 pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr,
2294 struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn)
2296 unsigned char hash[16];
2297 struct pf_pool *rpool = &r->rpool;
2298 struct pf_addr *raddr = &rpool->cur->addr.v.a.addr;
2299 struct pf_addr *rmask = &rpool->cur->addr.v.a.mask;
2300 struct pf_pooladdr *acur = rpool->cur;
2301 struct pf_src_node k;
2303 if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR &&
2304 (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
2306 PF_ACPY(&k.addr, saddr, af);
2307 if (r->rule_flag & PFRULE_RULESRCTRACK ||
2308 r->rpool.opts & PF_POOL_STICKYADDR)
2312 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
2313 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
2314 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) {
2315 PF_ACPY(naddr, &(*sn)->raddr, af);
2316 if (pf_status.debug >= PF_DEBUG_MISC) {
2317 kprintf("pf_map_addr: src tracking maps ");
2318 pf_print_host(&k.addr, 0, af);
2320 pf_print_host(naddr, 0, af);
2327 if (rpool->cur->addr.type == PF_ADDR_NOROUTE)
2329 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
2333 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
2334 (rpool->opts & PF_POOL_TYPEMASK) !=
2337 raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
2338 rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
2343 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
2344 (rpool->opts & PF_POOL_TYPEMASK) !=
2347 raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
2348 rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
2352 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
2353 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN)
2354 return (1); /* unsupported */
2356 raddr = &rpool->cur->addr.v.a.addr;
2357 rmask = &rpool->cur->addr.v.a.mask;
2360 switch (rpool->opts & PF_POOL_TYPEMASK) {
2362 PF_ACPY(naddr, raddr, af);
2364 case PF_POOL_BITMASK:
2365 PF_POOLMASK(naddr, raddr, rmask, saddr, af);
2367 case PF_POOL_RANDOM:
2368 if (init_addr != NULL && PF_AZERO(init_addr, af)) {
2372 rpool->counter.addr32[0] = htonl(karc4random());
2377 if (rmask->addr32[3] != 0xffffffff)
2378 rpool->counter.addr32[3] =
2379 htonl(karc4random());
2382 if (rmask->addr32[2] != 0xffffffff)
2383 rpool->counter.addr32[2] =
2384 htonl(karc4random());
2387 if (rmask->addr32[1] != 0xffffffff)
2388 rpool->counter.addr32[1] =
2389 htonl(karc4random());
2392 if (rmask->addr32[0] != 0xffffffff)
2393 rpool->counter.addr32[0] =
2394 htonl(karc4random());
2398 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
2399 PF_ACPY(init_addr, naddr, af);
2402 PF_AINC(&rpool->counter, af);
2403 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
2406 case PF_POOL_SRCHASH:
2407 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af);
2408 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af);
2410 case PF_POOL_ROUNDROBIN:
2411 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
2412 if (!pfr_pool_get(rpool->cur->addr.p.tbl,
2413 &rpool->tblidx, &rpool->counter,
2414 &raddr, &rmask, af))
2416 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
2417 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
2418 &rpool->tblidx, &rpool->counter,
2419 &raddr, &rmask, af))
2421 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
2425 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL)
2426 rpool->cur = TAILQ_FIRST(&rpool->list);
2427 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
2429 if (pfr_pool_get(rpool->cur->addr.p.tbl,
2430 &rpool->tblidx, &rpool->counter,
2431 &raddr, &rmask, af)) {
2432 /* table contains no address of type 'af' */
2433 if (rpool->cur != acur)
2437 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
2439 if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
2440 &rpool->tblidx, &rpool->counter,
2441 &raddr, &rmask, af)) {
2442 /* table contains no address of type 'af' */
2443 if (rpool->cur != acur)
2448 raddr = &rpool->cur->addr.v.a.addr;
2449 rmask = &rpool->cur->addr.v.a.mask;
2450 PF_ACPY(&rpool->counter, raddr, af);
2454 PF_ACPY(naddr, &rpool->counter, af);
2455 if (init_addr != NULL && PF_AZERO(init_addr, af))
2456 PF_ACPY(init_addr, naddr, af);
2457 PF_AINC(&rpool->counter, af);
2461 PF_ACPY(&(*sn)->raddr, naddr, af);
2463 if (pf_status.debug >= PF_DEBUG_MISC &&
2464 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
2465 kprintf("pf_map_addr: selected address ");
2466 pf_print_host(naddr, 0, af);
2474 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r,
2475 struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport,
2476 struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high,
2477 struct pf_src_node **sn)
2479 struct pf_state_key_cmp key;
2480 struct pf_addr init_addr;
2483 bzero(&init_addr, sizeof(init_addr));
2484 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
2487 if (proto == IPPROTO_ICMP) {
2495 PF_ACPY(&key.addr[1], daddr, key.af);
2496 PF_ACPY(&key.addr[0], naddr, key.af);
2497 key.port[1] = dport;
2500 * port search; start random, step;
2501 * similar 2 portloop in in_pcbbind
2503 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP ||
2504 proto == IPPROTO_ICMP)) {
2505 key.port[0] = dport;
2506 if (pf_find_state_all(&key, PF_IN, NULL) == NULL)
2508 } else if (low == 0 && high == 0) {
2509 key.port[0] = *nport;
2510 if (pf_find_state_all(&key, PF_IN, NULL) == NULL)
2512 } else if (low == high) {
2513 key.port[0] = htons(low);
2514 if (pf_find_state_all(&key, PF_IN, NULL) == NULL) {
2515 *nport = htons(low);
2527 cut = htonl(karc4random()) % (1 + high - low) + low;
2528 /* low <= cut <= high */
2529 for (tmp = cut; tmp <= high; ++(tmp)) {
2530 key.port[0] = htons(tmp);
2531 if (pf_find_state_all(&key, PF_IN, NULL) ==
2532 NULL && !in_baddynamic(tmp, proto)) {
2533 *nport = htons(tmp);
2537 for (tmp = cut - 1; tmp >= low; --(tmp)) {
2538 key.port[0] = htons(tmp);
2539 if (pf_find_state_all(&key, PF_IN, NULL) ==
2540 NULL && !in_baddynamic(tmp, proto)) {
2541 *nport = htons(tmp);
2547 switch (r->rpool.opts & PF_POOL_TYPEMASK) {
2548 case PF_POOL_RANDOM:
2549 case PF_POOL_ROUNDROBIN:
2550 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
2554 case PF_POOL_SRCHASH:
2555 case PF_POOL_BITMASK:
2559 } while (! PF_AEQ(&init_addr, naddr, af) );
2560 return (1); /* none available */
2564 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
2565 int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport,
2566 struct pf_addr *daddr, u_int16_t dport, int rs_num)
2568 struct pf_rule *r, *rm = NULL;
2569 struct pf_ruleset *ruleset = NULL;
2574 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr);
2575 while (r && rm == NULL) {
2576 struct pf_rule_addr *src = NULL, *dst = NULL;
2577 struct pf_addr_wrap *xdst = NULL;
2579 if (r->action == PF_BINAT && direction == PF_IN) {
2581 if (r->rpool.cur != NULL)
2582 xdst = &r->rpool.cur->addr;
2589 if (pfi_kif_match(r->kif, kif) == r->ifnot)
2590 r = r->skip[PF_SKIP_IFP].ptr;
2591 else if (r->direction && r->direction != direction)
2592 r = r->skip[PF_SKIP_DIR].ptr;
2593 else if (r->af && r->af != pd->af)
2594 r = r->skip[PF_SKIP_AF].ptr;
2595 else if (r->proto && r->proto != pd->proto)
2596 r = r->skip[PF_SKIP_PROTO].ptr;
2597 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af,
2599 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR :
2600 PF_SKIP_DST_ADDR].ptr;
2601 else if (src->port_op && !pf_match_port(src->port_op,
2602 src->port[0], src->port[1], sport))
2603 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT :
2604 PF_SKIP_DST_PORT].ptr;
2605 else if (dst != NULL &&
2606 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL))
2607 r = r->skip[PF_SKIP_DST_ADDR].ptr;
2608 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af,
2610 r = TAILQ_NEXT(r, entries);
2611 else if (dst != NULL && dst->port_op &&
2612 !pf_match_port(dst->port_op, dst->port[0],
2613 dst->port[1], dport))
2614 r = r->skip[PF_SKIP_DST_PORT].ptr;
2615 else if (r->match_tag && !pf_match_tag(m, r, &tag))
2616 r = TAILQ_NEXT(r, entries);
2617 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto !=
2618 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m,
2619 off, pd->hdr.tcp), r->os_fingerprint)))
2620 r = TAILQ_NEXT(r, entries);
2624 if (r->rtableid >= 0)
2625 rtableid = r->rtableid;
2626 if (r->anchor == NULL) {
2629 pf_step_into_anchor(&asd, &ruleset, rs_num,
2633 pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r,
2636 if (pf_tag_packet(m, tag, rtableid))
2638 if (rm != NULL && (rm->action == PF_NONAT ||
2639 rm->action == PF_NORDR || rm->action == PF_NOBINAT))
2645 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction,
2646 struct pfi_kif *kif, struct pf_src_node **sn,
2647 struct pf_state_key **skw, struct pf_state_key **sks,
2648 struct pf_state_key **skp, struct pf_state_key **nkp,
2649 struct pf_addr *saddr, struct pf_addr *daddr,
2650 u_int16_t sport, u_int16_t dport)
2652 struct pf_rule *r = NULL;
2655 if (direction == PF_OUT) {
2656 r = pf_match_translation(pd, m, off, direction, kif, saddr,
2657 sport, daddr, dport, PF_RULESET_BINAT);
2659 r = pf_match_translation(pd, m, off, direction, kif,
2660 saddr, sport, daddr, dport, PF_RULESET_NAT);
2662 r = pf_match_translation(pd, m, off, direction, kif, saddr,
2663 sport, daddr, dport, PF_RULESET_RDR);
2665 r = pf_match_translation(pd, m, off, direction, kif,
2666 saddr, sport, daddr, dport, PF_RULESET_BINAT);
2670 struct pf_addr *naddr;
2673 if (pf_state_key_setup(pd, r, skw, sks, skp, nkp,
2674 saddr, daddr, sport, dport))
2677 /* XXX We only modify one side for now. */
2678 naddr = &(*nkp)->addr[1];
2679 nport = &(*nkp)->port[1];
2682 * NOTE: Currently all translations will clear
2683 * BRIDGE_MBUF_TAGGED, telling the bridge to
2684 * ignore the original input encapsulation.
2686 switch (r->action) {
2692 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
2693 if (pf_get_sport(pd->af, pd->proto, r, saddr,
2694 daddr, dport, naddr, nport, r->rpool.proxy_port[0],
2695 r->rpool.proxy_port[1], sn)) {
2696 DPFPRINTF(PF_DEBUG_MISC,
2697 ("pf: NAT proxy port allocation "
2699 r->rpool.proxy_port[0],
2700 r->rpool.proxy_port[1]));
2705 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
2706 switch (direction) {
2708 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){
2712 if (r->rpool.cur->addr.p.dyn->
2716 &r->rpool.cur->addr.p.dyn->
2718 &r->rpool.cur->addr.p.dyn->
2725 if (r->rpool.cur->addr.p.dyn->
2729 &r->rpool.cur->addr.p.dyn->
2731 &r->rpool.cur->addr.p.dyn->
2739 &r->rpool.cur->addr.v.a.addr,
2740 &r->rpool.cur->addr.v.a.mask,
2744 if (r->src.addr.type == PF_ADDR_DYNIFTL) {
2748 if (r->src.addr.p.dyn->
2752 &r->src.addr.p.dyn->
2754 &r->src.addr.p.dyn->
2761 if (r->src.addr.p.dyn->
2765 &r->src.addr.p.dyn->
2767 &r->src.addr.p.dyn->
2775 &r->src.addr.v.a.addr,
2776 &r->src.addr.v.a.mask, daddr,
2782 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
2783 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn))
2785 if ((r->rpool.opts & PF_POOL_TYPEMASK) ==
2787 PF_POOLMASK(naddr, naddr,
2788 &r->rpool.cur->addr.v.a.mask, daddr,
2791 if (r->rpool.proxy_port[1]) {
2792 u_int32_t tmp_nport;
2794 tmp_nport = ((ntohs(dport) -
2795 ntohs(r->dst.port[0])) %
2796 (r->rpool.proxy_port[1] -
2797 r->rpool.proxy_port[0] + 1)) +
2798 r->rpool.proxy_port[0];
2800 /* wrap around if necessary */
2801 if (tmp_nport > 65535)
2803 *nport = htons((u_int16_t)tmp_nport);
2804 } else if (r->rpool.proxy_port[0])
2805 *nport = htons(r->rpool.proxy_port[0]);
2817 struct netmsg_hashlookup {
2818 struct netmsg_base base;
2819 struct inpcb **nm_pinp;
2820 struct inpcbinfo *nm_pcbinfo;
2821 struct pf_addr *nm_saddr;
2822 struct pf_addr *nm_daddr;
2828 #ifdef PF_SOCKET_LOOKUP_DOMSG
2830 in_pcblookup_hash_handler(netmsg_t msg)
2832 struct netmsg_hashlookup *rmsg = (struct netmsg_hashlookup *)msg;
2834 if (rmsg->nm_af == AF_INET)
2835 *rmsg->nm_pinp = in_pcblookup_hash(rmsg->nm_pcbinfo,
2836 rmsg->nm_saddr->v4, rmsg->nm_sport, rmsg->nm_daddr->v4,
2837 rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL);
2840 *rmsg->nm_pinp = in6_pcblookup_hash(rmsg->nm_pcbinfo,
2841 &rmsg->nm_saddr->v6, rmsg->nm_sport, &rmsg->nm_daddr->v6,
2842 rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL);
2844 lwkt_replymsg(&rmsg->base.lmsg, 0);
2846 #endif /* PF_SOCKET_LOOKUP_DOMSG */
2851 pf_socket_lookup(int direction, struct pf_pdesc *pd)
2853 struct pf_addr *saddr, *daddr;
2854 u_int16_t sport, dport;
2855 struct inpcbinfo *pi;
2858 struct netmsg_hashlookup *msg = NULL;
2859 #ifdef PF_SOCKET_LOOKUP_DOMSG
2860 struct netmsg_hashlookup msg0;
2867 pd->lookup.uid = UID_MAX;
2868 pd->lookup.gid = GID_MAX;
2869 pd->lookup.pid = NO_PID;
2870 if (direction == PF_IN) {
2877 switch (pd->proto) {
2879 if (pd->hdr.tcp == NULL)
2881 sport = pd->hdr.tcp->th_sport;
2882 dport = pd->hdr.tcp->th_dport;
2884 pi_cpu = tcp_addrcpu(saddr->v4.s_addr, sport, daddr->v4.s_addr, dport);
2885 pi = &tcbinfo[pi_cpu];
2888 * Our netstack runs lockless on MP systems
2889 * (only for TCP connections at the moment).
2891 * As we are not allowed to read another CPU's tcbinfo,
2892 * we have to ask that CPU via remote call to search the
2895 * Prepare a msg iff data belongs to another CPU.
2897 if (pi_cpu != mycpu->gd_cpuid) {
2898 #ifdef PF_SOCKET_LOOKUP_DOMSG
2902 * Following lwkt_domsg() is dangerous and could
2903 * lockup the network system, e.g.
2906 * netisr0 domsg to netisr1 (due to lookup)
2907 * netisr1 domsg to netisr0 (due to lookup)
2909 * We simply return -1 here, since we are probably
2910 * called before NAT, so the TCP packet should
2911 * already be on the correct CPU.
2914 netmsg_init(&msg->base, NULL, &curthread->td_msgport,
2915 0, in_pcblookup_hash_handler);
2916 msg->nm_pinp = &inp;
2917 msg->nm_pcbinfo = pi;
2918 msg->nm_saddr = saddr;
2919 msg->nm_sport = sport;
2920 msg->nm_daddr = daddr;
2921 msg->nm_dport = dport;
2922 msg->nm_af = pd->af;
2923 #else /* !PF_SOCKET_LOOKUP_DOMSG */
2924 kprintf("pf_socket_lookup: tcp packet not on the "
2925 "correct cpu %d, cur cpu %d\n",
2927 print_backtrace(-1);
2929 #endif /* PF_SOCKET_LOOKUP_DOMSG */
2934 if (pd->hdr.udp == NULL)
2936 sport = pd->hdr.udp->uh_sport;
2937 dport = pd->hdr.udp->uh_dport;
2943 if (direction != PF_IN) {
2955 * Query other CPU, second part
2957 * msg only gets initialized when:
2959 * 2) the info belongs to another CPU
2961 * Use some switch/case magic to avoid code duplication.
2966 inp = in6_pcblookup_hash(pi, &saddr->v6, sport,
2967 &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL);
2973 /* FALLTHROUGH if SMP and on other CPU */
2978 lwkt_domsg(cpu_portfn(pi_cpu),
2979 &msg->base.lmsg, 0);
2983 inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4,
2984 dport, INPLOOKUP_WILDCARD, NULL);
2993 pd->lookup.uid = inp->inp_socket->so_cred->cr_uid;
2994 pd->lookup.gid = inp->inp_socket->so_cred->cr_groups[0];
2999 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
3003 u_int8_t *opt, optlen;
3004 u_int8_t wscale = 0;
3006 hlen = th_off << 2; /* hlen <= sizeof(hdr) */
3007 if (hlen <= sizeof(struct tcphdr))
3009 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
3011 opt = hdr + sizeof(struct tcphdr);
3012 hlen -= sizeof(struct tcphdr);
3022 if (wscale > TCP_MAX_WINSHIFT)
3023 wscale = TCP_MAX_WINSHIFT;
3024 wscale |= PF_WSCALE_FLAG;
3039 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
3043 u_int8_t *opt, optlen;
3044 u_int16_t mss = tcp_mssdflt;
3046 hlen = th_off << 2; /* hlen <= sizeof(hdr) */
3047 if (hlen <= sizeof(struct tcphdr))
3049 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
3051 opt = hdr + sizeof(struct tcphdr);
3052 hlen -= sizeof(struct tcphdr);
3053 while (hlen >= TCPOLEN_MAXSEG) {
3061 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
3076 pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer)
3079 struct sockaddr_in *dst;
3083 struct sockaddr_in6 *dst6;
3084 struct route_in6 ro6;
3086 struct rtentry *rt = NULL;
3088 u_int16_t mss = tcp_mssdflt;
3093 hlen = sizeof(struct ip);
3094 bzero(&ro, sizeof(ro));
3095 dst = (struct sockaddr_in *)&ro.ro_dst;
3096 dst->sin_family = AF_INET;
3097 dst->sin_len = sizeof(*dst);
3098 dst->sin_addr = addr->v4;
3099 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING));
3105 hlen = sizeof(struct ip6_hdr);
3106 bzero(&ro6, sizeof(ro6));
3107 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst;
3108 dst6->sin6_family = AF_INET6;
3109 dst6->sin6_len = sizeof(*dst6);
3110 dst6->sin6_addr = addr->v6;
3111 rtalloc_ign((struct route *)&ro6, (RTF_CLONING | RTF_PRCLONING));
3117 if (rt && rt->rt_ifp) {
3118 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr);
3119 mss = max(tcp_mssdflt, mss);
3122 mss = min(mss, offer);
3123 mss = max(mss, 64); /* sanity - at least max opt space */
3128 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr)
3130 struct pf_rule *r = s->rule.ptr;
3133 if (!r->rt || r->rt == PF_FASTROUTE)
3135 switch (s->key[PF_SK_WIRE]->af) {
3138 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL,
3140 s->rt_kif = r->rpool.cur->kif;
3145 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL,
3147 s->rt_kif = r->rpool.cur->kif;
3154 pf_tcp_iss(struct pf_pdesc *pd)
3157 u_int32_t digest[4];
3159 if (pf_tcp_secret_init == 0) {
3160 karc4rand(pf_tcp_secret, sizeof(pf_tcp_secret));
3161 MD5Init(&pf_tcp_secret_ctx);
3162 MD5Update(&pf_tcp_secret_ctx, pf_tcp_secret,
3163 sizeof(pf_tcp_secret));
3164 pf_tcp_secret_init = 1;
3166 ctx = pf_tcp_secret_ctx;
3168 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short));
3169 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short));
3170 if (pd->af == AF_INET6) {
3171 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr));
3172 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr));
3174 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr));
3175 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr));
3177 MD5Final((u_char *)digest, &ctx);
3178 pf_tcp_iss_off += 4096;
3179 return (digest[0] + pd->hdr.tcp->th_seq + pf_tcp_iss_off);
3183 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction,
3184 struct pfi_kif *kif, struct mbuf *m, int off, void *h,
3185 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm,
3186 struct ifqueue *ifq, struct inpcb *inp)
3188 struct pf_rule *nr = NULL;
3189 struct pf_addr *saddr = pd->src, *daddr = pd->dst;
3190 sa_family_t af = pd->af;
3191 struct pf_rule *r, *a = NULL;
3192 struct pf_ruleset *ruleset = NULL;
3193 struct pf_src_node *nsn = NULL;
3194 struct tcphdr *th = pd->hdr.tcp;
3195 struct pf_state_key *skw = NULL, *sks = NULL;
3196 struct pf_state_key *sk = NULL, *nk = NULL;
3198 int rewrite = 0, hdrlen = 0;
3199 int tag = -1, rtableid = -1;
3203 u_int16_t sport = 0, dport = 0;
3204 u_int16_t nport = 0, bport = 0;
3205 u_int16_t bproto_sum = 0, bip_sum = 0;
3206 u_int8_t icmptype = 0, icmpcode = 0;
3209 if (direction == PF_IN && pf_check_congestion(ifq)) {
3210 REASON_SET(&reason, PFRES_CONGEST);
3215 pd->lookup.done = pf_socket_lookup(direction, pd);
3216 else if (debug_pfugidhack) {
3217 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n"));
3218 pd->lookup.done = pf_socket_lookup(direction, pd);
3221 switch (pd->proto) {
3223 sport = th->th_sport;
3224 dport = th->th_dport;
3225 hdrlen = sizeof(*th);
3228 sport = pd->hdr.udp->uh_sport;
3229 dport = pd->hdr.udp->uh_dport;
3230 hdrlen = sizeof(*pd->hdr.udp);
3234 if (pd->af != AF_INET)
3236 sport = dport = pd->hdr.icmp->icmp_id;
3237 hdrlen = sizeof(*pd->hdr.icmp);
3238 icmptype = pd->hdr.icmp->icmp_type;
3239 icmpcode = pd->hdr.icmp->icmp_code;
3241 if (icmptype == ICMP_UNREACH ||
3242 icmptype == ICMP_SOURCEQUENCH ||
3243 icmptype == ICMP_REDIRECT ||
3244 icmptype == ICMP_TIMXCEED ||
3245 icmptype == ICMP_PARAMPROB)
3250 case IPPROTO_ICMPV6:
3253 sport = dport = pd->hdr.icmp6->icmp6_id;
3254 hdrlen = sizeof(*pd->hdr.icmp6);
3255 icmptype = pd->hdr.icmp6->icmp6_type;
3256 icmpcode = pd->hdr.icmp6->icmp6_code;
3258 if (icmptype == ICMP6_DST_UNREACH ||
3259 icmptype == ICMP6_PACKET_TOO_BIG ||
3260 icmptype == ICMP6_TIME_EXCEEDED ||
3261 icmptype == ICMP6_PARAM_PROB)
3266 sport = dport = hdrlen = 0;
3270 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3272 bport = nport = sport;
3273 /* check packet for BINAT/NAT/RDR */
3274 if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn,
3275 &skw, &sks, &sk, &nk, saddr, daddr, sport, dport)) != NULL) {
3276 if (nk == NULL || sk == NULL) {
3277 REASON_SET(&reason, PFRES_MEMORY);
3282 bip_sum = *pd->ip_sum;
3284 switch (pd->proto) {
3286 bproto_sum = th->th_sum;
3287 pd->proto_sum = &th->th_sum;
3289 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3290 nk->port[pd->sidx] != sport) {
3291 pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
3292 &th->th_sum, &nk->addr[pd->sidx],
3293 nk->port[pd->sidx], 0, af);
3294 pd->sport = &th->th_sport;
3295 sport = th->th_sport;
3298 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3299 nk->port[pd->didx] != dport) {
3300 pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
3301 &th->th_sum, &nk->addr[pd->didx],
3302 nk->port[pd->didx], 0, af);
3303 dport = th->th_dport;
3304 pd->dport = &th->th_dport;
3309 bproto_sum = pd->hdr.udp->uh_sum;
3310 pd->proto_sum = &pd->hdr.udp->uh_sum;
3312 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3313 nk->port[pd->sidx] != sport) {
3314 pf_change_ap(saddr, &pd->hdr.udp->uh_sport,
3315 pd->ip_sum, &pd->hdr.udp->uh_sum,
3316 &nk->addr[pd->sidx],
3317 nk->port[pd->sidx], 1, af);
3318 sport = pd->hdr.udp->uh_sport;
3319 pd->sport = &pd->hdr.udp->uh_sport;
3322 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3323 nk->port[pd->didx] != dport) {
3324 pf_change_ap(daddr, &pd->hdr.udp->uh_dport,
3325 pd->ip_sum, &pd->hdr.udp->uh_sum,
3326 &nk->addr[pd->didx],
3327 nk->port[pd->didx], 1, af);
3328 dport = pd->hdr.udp->uh_dport;
3329 pd->dport = &pd->hdr.udp->uh_dport;
3335 nk->port[0] = nk->port[1];
3336 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET))
3337 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3338 nk->addr[pd->sidx].v4.s_addr, 0);
3340 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET))
3341 pf_change_a(&daddr->v4.s_addr, pd->ip_sum,
3342 nk->addr[pd->didx].v4.s_addr, 0);
3344 if (nk->port[1] != pd->hdr.icmp->icmp_id) {
3345 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup(
3346 pd->hdr.icmp->icmp_cksum, sport,
3348 pd->hdr.icmp->icmp_id = nk->port[1];
3349 pd->sport = &pd->hdr.icmp->icmp_id;
3351 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
3355 case IPPROTO_ICMPV6:
3356 nk->port[0] = nk->port[1];
3357 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6))
3358 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
3359 &nk->addr[pd->sidx], 0);
3361 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6))
3362 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
3363 &nk->addr[pd->didx], 0);
3372 &nk->addr[pd->sidx], AF_INET))
3373 pf_change_a(&saddr->v4.s_addr,
3375 nk->addr[pd->sidx].v4.s_addr, 0);
3378 &nk->addr[pd->didx], AF_INET))
3379 pf_change_a(&daddr->v4.s_addr,
3381 nk->addr[pd->didx].v4.s_addr, 0);
3387 &nk->addr[pd->sidx], AF_INET6))
3388 PF_ACPY(saddr, &nk->addr[pd->sidx], af);
3391 &nk->addr[pd->didx], AF_INET6))
3392 PF_ACPY(saddr, &nk->addr[pd->didx], af);
3405 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3406 r = r->skip[PF_SKIP_IFP].ptr;
3407 else if (r->direction && r->direction != direction)
3408 r = r->skip[PF_SKIP_DIR].ptr;
3409 else if (r->af && r->af != af)
3410 r = r->skip[PF_SKIP_AF].ptr;
3411 else if (r->proto && r->proto != pd->proto)
3412 r = r->skip[PF_SKIP_PROTO].ptr;
3413 else if (PF_MISMATCHAW(&r->src.addr, saddr, af,
3415 r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3416 /* tcp/udp only. port_op always 0 in other cases */
3417 else if (r->src.port_op && !pf_match_port(r->src.port_op,
3418 r->src.port[0], r->src.port[1], sport))
3419 r = r->skip[PF_SKIP_SRC_PORT].ptr;
3420 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af,
3422 r = r->skip[PF_SKIP_DST_ADDR].ptr;
3423 /* tcp/udp only. port_op always 0 in other cases */
3424 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
3425 r->dst.port[0], r->dst.port[1], dport))
3426 r = r->skip[PF_SKIP_DST_PORT].ptr;
3427 /* icmp only. type always 0 in other cases */
3428 else if (r->type && r->type != icmptype + 1)
3429 r = TAILQ_NEXT(r, entries);
3430 /* icmp only. type always 0 in other cases */
3431 else if (r->code && r->code != icmpcode + 1)
3432 r = TAILQ_NEXT(r, entries);
3433 else if (r->tos && !(r->tos == pd->tos))
3434 r = TAILQ_NEXT(r, entries);
3435 else if (r->rule_flag & PFRULE_FRAGMENT)
3436 r = TAILQ_NEXT(r, entries);
3437 else if (pd->proto == IPPROTO_TCP &&
3438 (r->flagset & th->th_flags) != r->flags)
3439 r = TAILQ_NEXT(r, entries);
3440 /* tcp/udp only. uid.op always 0 in other cases */
3441 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done =
3442 pf_socket_lookup(direction, pd), 1)) &&
3443 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
3445 r = TAILQ_NEXT(r, entries);
3446 /* tcp/udp only. gid.op always 0 in other cases */
3447 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done =
3448 pf_socket_lookup(direction, pd), 1)) &&
3449 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
3451 r = TAILQ_NEXT(r, entries);
3453 r->prob <= karc4random())
3454 r = TAILQ_NEXT(r, entries);
3455 else if (r->match_tag && !pf_match_tag(m, r, &tag))
3456 r = TAILQ_NEXT(r, entries);
3457 else if (r->os_fingerprint != PF_OSFP_ANY &&
3458 (pd->proto != IPPROTO_TCP || !pf_osfp_match(
3459 pf_osfp_fingerprint(pd, m, off, th),
3460 r->os_fingerprint)))
3461 r = TAILQ_NEXT(r, entries);
3465 if (r->rtableid >= 0)
3466 rtableid = r->rtableid;
3467 if (r->anchor == NULL) {
3474 r = TAILQ_NEXT(r, entries);
3476 pf_step_into_anchor(&asd, &ruleset,
3477 PF_RULESET_FILTER, &r, &a, &match);
3479 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
3480 PF_RULESET_FILTER, &r, &a, &match))
3487 REASON_SET(&reason, PFRES_MATCH);
3489 if (r->log || (nr != NULL && nr->log)) {
3491 m_copyback(m, off, hdrlen, pd->hdr.any);
3492 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr,
3496 if ((r->action == PF_DROP) &&
3497 ((r->rule_flag & PFRULE_RETURNRST) ||
3498 (r->rule_flag & PFRULE_RETURNICMP) ||
3499 (r->rule_flag & PFRULE_RETURN))) {
3500 /* undo NAT changes, if they have taken place */
3502 PF_ACPY(saddr, &sk->addr[pd->sidx], af);
3503 PF_ACPY(daddr, &sk->addr[pd->didx], af);
3505 *pd->sport = sk->port[pd->sidx];
3507 *pd->dport = sk->port[pd->didx];
3509 *pd->proto_sum = bproto_sum;
3511 *pd->ip_sum = bip_sum;
3512 m_copyback(m, off, hdrlen, pd->hdr.any);
3514 if (pd->proto == IPPROTO_TCP &&
3515 ((r->rule_flag & PFRULE_RETURNRST) ||
3516 (r->rule_flag & PFRULE_RETURN)) &&
3517 !(th->th_flags & TH_RST)) {
3518 u_int32_t ack = ntohl(th->th_seq) + pd->p_len;
3526 h4 = mtod(m, struct ip *);
3527 len = h4->ip_len - off;
3531 h6 = mtod(m, struct ip6_hdr *);
3532 len = h6->ip6_plen - (off - sizeof(*h6));
3537 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af))
3538 REASON_SET(&reason, PFRES_PROTCKSUM);
3540 if (th->th_flags & TH_SYN)
3542 if (th->th_flags & TH_FIN)
3544 pf_send_tcp(r, af, pd->dst,
3545 pd->src, th->th_dport, th->th_sport,
3546 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
3547 r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp);
3549 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET &&
3551 pf_send_icmp(m, r->return_icmp >> 8,
3552 r->return_icmp & 255, af, r);
3553 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 &&
3555 pf_send_icmp(m, r->return_icmp6 >> 8,
3556 r->return_icmp6 & 255, af, r);
3559 if (r->action == PF_DROP)
3562 if (pf_tag_packet(m, tag, rtableid)) {
3563 REASON_SET(&reason, PFRES_MEMORY);
3567 if (!state_icmp && (r->keep_state || nr != NULL ||
3568 (pd->flags & PFDESC_TCP_NORM))) {
3570 action = pf_create_state(r, nr, a, pd, nsn, skw, sks, nk, sk, m,
3571 off, sport, dport, &rewrite, kif, sm, tag, bproto_sum,
3573 if (action != PF_PASS)
3577 /* copy back packet headers if we performed NAT operations */
3579 m_copyback(m, off, hdrlen, pd->hdr.any);
3585 kfree(sk, M_PFSTATEKEYPL);
3587 kfree(nk, M_PFSTATEKEYPL);
3592 pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a,
3593 struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *skw,
3594 struct pf_state_key *sks, struct pf_state_key *nk, struct pf_state_key *sk,
3595 struct mbuf *m, int off, u_int16_t sport, u_int16_t dport, int *rewrite,
3596 struct pfi_kif *kif, struct pf_state **sm, int tag, u_int16_t bproto_sum,
3597 u_int16_t bip_sum, int hdrlen)
3599 struct pf_state *s = NULL;
3600 struct pf_src_node *sn = NULL;
3601 struct tcphdr *th = pd->hdr.tcp;
3602 u_int16_t mss = tcp_mssdflt;
3605 /* check maximums */
3606 if (r->max_states && (r->states_cur >= r->max_states)) {
3607 pf_status.lcounters[LCNT_STATES]++;
3608 REASON_SET(&reason, PFRES_MAXSTATES);
3611 /* src node for filter rule */
3612 if ((r->rule_flag & PFRULE_SRCTRACK ||
3613 r->rpool.opts & PF_POOL_STICKYADDR) &&
3614 pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) {
3615 REASON_SET(&reason, PFRES_SRCLIMIT);
3618 /* src node for translation rule */
3619 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3620 pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) {
3621 REASON_SET(&reason, PFRES_SRCLIMIT);
3624 s = kmalloc(sizeof(struct pf_state), M_PFSTATEPL, M_NOWAIT|M_ZERO);
3626 REASON_SET(&reason, PFRES_MEMORY);
3629 s->id = 0; /* XXX Do we really need that? not in OpenBSD */
3632 s->nat_rule.ptr = nr;
3634 STATE_INC_COUNTERS(s);
3636 s->state_flags |= PFSTATE_ALLOWOPTS;
3637 if (r->rule_flag & PFRULE_STATESLOPPY)
3638 s->state_flags |= PFSTATE_SLOPPY;
3639 s->log = r->log & PF_LOG_ALL;
3641 s->log |= nr->log & PF_LOG_ALL;
3642 switch (pd->proto) {
3644 s->src.seqlo = ntohl(th->th_seq);
3645 s->src.seqhi = s->src.seqlo + pd->p_len + 1;
3646 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
3647 r->keep_state == PF_STATE_MODULATE) {
3648 /* Generate sequence number modulator */
3649 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) ==
3652 pf_change_a(&th->th_seq, &th->th_sum,
3653 htonl(s->src.seqlo + s->src.seqdiff), 0);
3657 if (th->th_flags & TH_SYN) {
3659 s->src.wscale = pf_get_wscale(m, off,
3660 th->th_off, pd->af);
3662 s->src.max_win = MAX(ntohs(th->th_win), 1);
3663 if (s->src.wscale & PF_WSCALE_MASK) {
3664 /* Remove scale factor from initial window */
3665 int win = s->src.max_win;
3666 win += 1 << (s->src.wscale & PF_WSCALE_MASK);
3667 s->src.max_win = (win - 1) >>
3668 (s->src.wscale & PF_WSCALE_MASK);
3670 if (th->th_flags & TH_FIN)
3674 s->src.state = TCPS_SYN_SENT;
3675 s->dst.state = TCPS_CLOSED;
3676 s->timeout = PFTM_TCP_FIRST_PACKET;
3679 s->src.state = PFUDPS_SINGLE;
3680 s->dst.state = PFUDPS_NO_TRAFFIC;
3681 s->timeout = PFTM_UDP_FIRST_PACKET;
3685 case IPPROTO_ICMPV6:
3687 s->timeout = PFTM_ICMP_FIRST_PACKET;
3690 s->src.state = PFOTHERS_SINGLE;
3691 s->dst.state = PFOTHERS_NO_TRAFFIC;
3692 s->timeout = PFTM_OTHER_FIRST_PACKET;
3695 s->creation = time_second;
3696 s->expire = time_second;
3700 s->src_node->states++;
3703 /* XXX We only modify one side for now. */
3704 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af);
3705 s->nat_src_node = nsn;
3706 s->nat_src_node->states++;
3708 if (pd->proto == IPPROTO_TCP) {
3709 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
3710 off, pd, th, &s->src, &s->dst)) {
3711 REASON_SET(&reason, PFRES_MEMORY);
3712 pf_src_tree_remove_state(s);
3713 STATE_DEC_COUNTERS(s);
3714 kfree(s, M_PFSTATEPL);
3717 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
3718 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s,
3719 &s->src, &s->dst, rewrite)) {
3720 /* This really shouldn't happen!!! */
3721 DPFPRINTF(PF_DEBUG_URGENT,
3722 ("pf_normalize_tcp_stateful failed on first pkt"));
3723 pf_normalize_tcp_cleanup(s);
3724 pf_src_tree_remove_state(s);
3725 STATE_DEC_COUNTERS(s);
3726 kfree(s, M_PFSTATEPL);
3730 s->direction = pd->dir;
3732 if (sk == NULL && pf_state_key_setup(pd, nr, &skw, &sks, &sk, &nk,
3733 pd->src, pd->dst, sport, dport))
3736 if (pf_state_insert(BOUND_IFACE(r, kif), skw, sks, s)) {
3737 if (pd->proto == IPPROTO_TCP)
3738 pf_normalize_tcp_cleanup(s);
3739 REASON_SET(&reason, PFRES_STATEINS);
3740 pf_src_tree_remove_state(s);
3741 STATE_DEC_COUNTERS(s);
3742 kfree(s, M_PFSTATEPL);
3747 pf_set_rt_ifp(s, pd->src); /* needs s->state_key set */
3752 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) ==
3753 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) {
3754 s->src.state = PF_TCPS_PROXY_SRC;
3755 /* undo NAT changes, if they have taken place */
3757 struct pf_state_key *skt = s->key[PF_SK_WIRE];
3758 if (pd->dir == PF_OUT)
3759 skt = s->key[PF_SK_STACK];
3760 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af);
3761 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af);
3763 *pd->sport = skt->port[pd->sidx];
3765 *pd->dport = skt->port[pd->didx];
3767 *pd->proto_sum = bproto_sum;
3769 *pd->ip_sum = bip_sum;
3770 m_copyback(m, off, hdrlen, pd->hdr.any);
3772 s->src.seqhi = htonl(karc4random());
3773 /* Find mss option */
3774 mss = pf_get_mss(m, off, th->th_off, pd->af);
3775 mss = pf_calc_mss(pd->src, pd->af, mss);
3776 mss = pf_calc_mss(pd->dst, pd->af, mss);
3778 pf_send_tcp(r, pd->af, pd->dst, pd->src, th->th_dport,
3779 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
3780 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL);
3781 REASON_SET(&reason, PFRES_SYNPROXY);
3782 return (PF_SYNPROXY_DROP);
3789 kfree(sk, M_PFSTATEKEYPL);
3791 kfree(nk, M_PFSTATEKEYPL);
3793 if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3794 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3795 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3796 pf_status.src_nodes--;
3797 kfree(sn, M_PFSRCTREEPL);
3799 if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0) {
3800 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3801 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3802 pf_status.src_nodes--;
3803 kfree(nsn, M_PFSRCTREEPL);
3809 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
3810 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
3811 struct pf_ruleset **rsm)
3813 struct pf_rule *r, *a = NULL;
3814 struct pf_ruleset *ruleset = NULL;
3815 sa_family_t af = pd->af;
3821 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3824 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3825 r = r->skip[PF_SKIP_IFP].ptr;
3826 else if (r->direction && r->direction != direction)
3827 r = r->skip[PF_SKIP_DIR].ptr;
3828 else if (r->af && r->af != af)
3829 r = r->skip[PF_SKIP_AF].ptr;
3830 else if (r->proto && r->proto != pd->proto)
3831 r = r->skip[PF_SKIP_PROTO].ptr;
3832 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af,
3834 r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3835 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af,
3837 r = r->skip[PF_SKIP_DST_ADDR].ptr;
3838 else if (r->tos && !(r->tos == pd->tos))
3839 r = TAILQ_NEXT(r, entries);
3840 else if (r->os_fingerprint != PF_OSFP_ANY)
3841 r = TAILQ_NEXT(r, entries);
3842 else if (pd->proto == IPPROTO_UDP &&
3843 (r->src.port_op || r->dst.port_op))
3844 r = TAILQ_NEXT(r, entries);
3845 else if (pd->proto == IPPROTO_TCP &&
3846 (r->src.port_op || r->dst.port_op || r->flagset))
3847 r = TAILQ_NEXT(r, entries);
3848 else if ((pd->proto == IPPROTO_ICMP ||
3849 pd->proto == IPPROTO_ICMPV6) &&
3850 (r->type || r->code))
3851 r = TAILQ_NEXT(r, entries);
3852 else if (r->prob && r->prob <= karc4random())
3853 r = TAILQ_NEXT(r, entries);
3854 else if (r->match_tag && !pf_match_tag(m, r, &tag))
3855 r = TAILQ_NEXT(r, entries);
3857 if (r->anchor == NULL) {
3864 r = TAILQ_NEXT(r, entries);
3866 pf_step_into_anchor(&asd, &ruleset,
3867 PF_RULESET_FILTER, &r, &a, &match);
3869 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
3870 PF_RULESET_FILTER, &r, &a, &match))
3877 REASON_SET(&reason, PFRES_MATCH);
3880 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset,
3883 if (r->action != PF_PASS)
3886 if (pf_tag_packet(m, tag, -1)) {
3887 REASON_SET(&reason, PFRES_MEMORY);
3895 pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst,
3896 struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off,
3897 struct pf_pdesc *pd, u_short *reason, int *copyback)
3899 struct tcphdr *th = pd->hdr.tcp;
3900 u_int16_t win = ntohs(th->th_win);
3901 u_int32_t ack, end, seq, orig_seq;
3905 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
3906 sws = src->wscale & PF_WSCALE_MASK;
3907 dws = dst->wscale & PF_WSCALE_MASK;
3912 * Sequence tracking algorithm from Guido van Rooij's paper:
3913 * http://www.madison-gurkha.com/publications/tcp_filtering/
3917 orig_seq = seq = ntohl(th->th_seq);
3918 if (src->seqlo == 0) {
3919 /* First packet from this end. Set its state */
3921 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
3922 src->scrub == NULL) {
3923 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
3924 REASON_SET(reason, PFRES_MEMORY);
3929 /* Deferred generation of sequence number modulator */
3930 if (dst->seqdiff && !src->seqdiff) {
3931 /* use random iss for the TCP server */
3932 while ((src->seqdiff = karc4random() - seq) == 0)
3934 ack = ntohl(th->th_ack) - dst->seqdiff;
3935 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3937 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3940 ack = ntohl(th->th_ack);
3943 end = seq + pd->p_len;
3944 if (th->th_flags & TH_SYN) {
3946 (*state)->sync_flags |= PFSTATE_GOT_SYN2;
3947 if (dst->wscale & PF_WSCALE_FLAG) {
3948 src->wscale = pf_get_wscale(m, off, th->th_off,
3950 if (src->wscale & PF_WSCALE_FLAG) {
3951 /* Remove scale factor from initial
3953 sws = src->wscale & PF_WSCALE_MASK;
3954 win = ((u_int32_t)win + (1 << sws) - 1)
3956 dws = dst->wscale & PF_WSCALE_MASK;
3958 /* fixup other window */
3959 dst->max_win <<= dst->wscale &
3961 /* in case of a retrans SYN|ACK */
3966 if (th->th_flags & TH_FIN)
3970 if (src->state < TCPS_SYN_SENT)
3971 src->state = TCPS_SYN_SENT;
3974 * May need to slide the window (seqhi may have been set by
3975 * the crappy stack check or if we picked up the connection
3976 * after establishment)
3978 if (src->seqhi == 1 ||
3979 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
3980 src->seqhi = end + MAX(1, dst->max_win << dws);
3981 if (win > src->max_win)
3985 ack = ntohl(th->th_ack) - dst->seqdiff;
3987 /* Modulate sequence numbers */
3988 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3990 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3993 end = seq + pd->p_len;
3994 if (th->th_flags & TH_SYN)
3996 if (th->th_flags & TH_FIN)
4000 if ((th->th_flags & TH_ACK) == 0) {
4001 /* Let it pass through the ack skew check */
4003 } else if ((ack == 0 &&
4004 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
4005 /* broken tcp stacks do not set ack */
4006 (dst->state < TCPS_SYN_SENT)) {
4008 * Many stacks (ours included) will set the ACK number in an
4009 * FIN|ACK if the SYN times out -- no sequence to ACK.
4015 /* Ease sequencing restrictions on no data packets */
4020 ackskew = dst->seqlo - ack;
4024 * Need to demodulate the sequence numbers in any TCP SACK options
4025 * (Selective ACK). We could optionally validate the SACK values
4026 * against the current ACK window, either forwards or backwards, but
4027 * I'm not confident that SACK has been implemented properly
4028 * everywhere. It wouldn't surprise me if several stacks accidently
4029 * SACK too far backwards of previously ACKed data. There really aren't
4030 * any security implications of bad SACKing unless the target stack
4031 * doesn't validate the option length correctly. Someone trying to
4032 * spoof into a TCP connection won't bother blindly sending SACK
4035 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) {
4036 if (pf_modulate_sack(m, off, pd, th, dst))
4041 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */
4042 if (SEQ_GEQ(src->seqhi, end) &&
4043 /* Last octet inside other's window space */
4044 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
4045 /* Retrans: not more than one window back */
4046 (ackskew >= -MAXACKWINDOW) &&
4047 /* Acking not more than one reassembled fragment backwards */
4048 (ackskew <= (MAXACKWINDOW << sws)) &&
4049 /* Acking not more than one window forward */
4050 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo ||
4051 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) ||
4052 (pd->flags & PFDESC_IP_REAS) == 0)) {
4053 /* Require an exact/+1 sequence match on resets when possible */
4055 if (dst->scrub || src->scrub) {
4056 if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4057 *state, src, dst, copyback))
4061 /* update max window */
4062 if (src->max_win < win)
4064 /* synchronize sequencing */
4065 if (SEQ_GT(end, src->seqlo))
4067 /* slide the window of what the other end can send */
4068 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4069 dst->seqhi = ack + MAX((win << sws), 1);
4073 if (th->th_flags & TH_SYN)
4074 if (src->state < TCPS_SYN_SENT)
4075 src->state = TCPS_SYN_SENT;
4076 if (th->th_flags & TH_FIN)
4077 if (src->state < TCPS_CLOSING)
4078 src->state = TCPS_CLOSING;
4079 if (th->th_flags & TH_ACK) {
4080 if (dst->state == TCPS_SYN_SENT) {
4081 dst->state = TCPS_ESTABLISHED;
4082 if (src->state == TCPS_ESTABLISHED &&
4083 (*state)->src_node != NULL &&
4084 pf_src_connlimit(state)) {
4085 REASON_SET(reason, PFRES_SRCLIMIT);
4088 } else if (dst->state == TCPS_CLOSING)
4089 dst->state = TCPS_FIN_WAIT_2;
4091 if (th->th_flags & TH_RST)
4092 src->state = dst->state = TCPS_TIME_WAIT;
4094 /* update expire time */
4095 (*state)->expire = time_second;
4096 if (src->state >= TCPS_FIN_WAIT_2 &&
4097 dst->state >= TCPS_FIN_WAIT_2)
4098 (*state)->timeout = PFTM_TCP_CLOSED;
4099 else if (src->state >= TCPS_CLOSING &&
4100 dst->state >= TCPS_CLOSING)
4101 (*state)->timeout = PFTM_TCP_FIN_WAIT;
4102 else if (src->state < TCPS_ESTABLISHED ||
4103 dst->state < TCPS_ESTABLISHED)
4104 (*state)->timeout = PFTM_TCP_OPENING;
4105 else if (src->state >= TCPS_CLOSING ||
4106 dst->state >= TCPS_CLOSING)
4107 (*state)->timeout = PFTM_TCP_CLOSING;
4109 (*state)->timeout = PFTM_TCP_ESTABLISHED;
4111 /* Fall through to PASS packet */
4113 } else if ((dst->state < TCPS_SYN_SENT ||
4114 dst->state >= TCPS_FIN_WAIT_2 ||
4115 src->state >= TCPS_FIN_WAIT_2) &&
4116 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
4117 /* Within a window forward of the originating packet */
4118 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
4119 /* Within a window backward of the originating packet */
4122 * This currently handles three situations:
4123 * 1) Stupid stacks will shotgun SYNs before their peer
4125 * 2) When PF catches an already established stream (the
4126 * firewall rebooted, the state table was flushed, routes
4128 * 3) Packets get funky immediately after the connection
4129 * closes (this should catch Solaris spurious ACK|FINs
4130 * that web servers like to spew after a close)
4132 * This must be a little more careful than the above code
4133 * since packet floods will also be caught here. We don't
4134 * update the TTL here to mitigate the damage of a packet
4135 * flood and so the same code can handle awkward establishment
4136 * and a loosened connection close.
4137 * In the establishment case, a correct peer response will
4138 * validate the connection, go through the normal state code
4139 * and keep updating the state TTL.
4142 if (pf_status.debug >= PF_DEBUG_MISC) {
4143 kprintf("pf: loose state match: ");
4144 pf_print_state(*state);
4145 pf_print_flags(th->th_flags);
4146 kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4147 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, pd->p_len,
4148 ackskew, (unsigned long long)(*state)->packets[0],
4149 (unsigned long long)(*state)->packets[1],
4150 pd->dir == PF_IN ? "in" : "out",
4151 pd->dir == (*state)->direction ? "fwd" : "rev");
4154 if (dst->scrub || src->scrub) {
4155 if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4156 *state, src, dst, copyback))
4160 /* update max window */
4161 if (src->max_win < win)
4163 /* synchronize sequencing */
4164 if (SEQ_GT(end, src->seqlo))
4166 /* slide the window of what the other end can send */
4167 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4168 dst->seqhi = ack + MAX((win << sws), 1);
4171 * Cannot set dst->seqhi here since this could be a shotgunned
4172 * SYN and not an already established connection.
4175 if (th->th_flags & TH_FIN)
4176 if (src->state < TCPS_CLOSING)
4177 src->state = TCPS_CLOSING;
4178 if (th->th_flags & TH_RST)
4179 src->state = dst->state = TCPS_TIME_WAIT;
4181 /* Fall through to PASS packet */
4183 } else if ((*state)->pickup_mode == PF_PICKUPS_HASHONLY ||
4184 ((*state)->pickup_mode == PF_PICKUPS_ENABLED &&
4185 ((*state)->sync_flags & PFSTATE_GOT_SYN_MASK) !=
4186 PFSTATE_GOT_SYN_MASK)) {
4188 * If pickup mode is hash only, do not fail on sequence checks.
4190 * If pickup mode is enabled and we did not see the SYN in
4191 * both direction, do not fail on sequence checks because
4192 * we do not have complete information on window scale.
4194 * Adjust expiration and fall through to PASS packet.
4195 * XXX Add a FIN check to reduce timeout?
4197 (*state)->expire = time_second;
4200 * Failure processing
4202 if ((*state)->dst.state == TCPS_SYN_SENT &&
4203 (*state)->src.state == TCPS_SYN_SENT) {
4204 /* Send RST for state mismatches during handshake */
4205 if (!(th->th_flags & TH_RST))
4206 pf_send_tcp((*state)->rule.ptr, pd->af,
4207 pd->dst, pd->src, th->th_dport,
4208 th->th_sport, ntohl(th->th_ack), 0,
4210 (*state)->rule.ptr->return_ttl, 1, 0,
4211 pd->eh, kif->pfik_ifp);
4215 } else if (pf_status.debug >= PF_DEBUG_MISC) {
4216 kprintf("pf: BAD state: ");
4217 pf_print_state(*state);
4218 pf_print_flags(th->th_flags);
4219 kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4220 "pkts=%llu:%llu dir=%s,%s\n",
4221 seq, orig_seq, ack, pd->p_len, ackskew,
4222 (unsigned long long)(*state)->packets[0],
4223 (unsigned long long)(*state)->packets[1],
4224 pd->dir == PF_IN ? "in" : "out",
4225 pd->dir == (*state)->direction ? "fwd" : "rev");
4226 kprintf("pf: State failure on: %c %c %c %c | %c %c\n",
4227 SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
4228 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
4230 (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
4231 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
4232 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
4233 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
4235 REASON_SET(reason, PFRES_BADSTATE);
4243 pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst,
4244 struct pf_state **state, struct pf_pdesc *pd, u_short *reason)
4246 struct tcphdr *th = pd->hdr.tcp;
4248 if (th->th_flags & TH_SYN)
4249 if (src->state < TCPS_SYN_SENT)
4250 src->state = TCPS_SYN_SENT;
4251 if (th->th_flags & TH_FIN)
4252 if (src->state < TCPS_CLOSING)
4253 src->state = TCPS_CLOSING;
4254 if (th->th_flags & TH_ACK) {
4255 if (dst->state == TCPS_SYN_SENT) {
4256 dst->state = TCPS_ESTABLISHED;
4257 if (src->state == TCPS_ESTABLISHED &&
4258 (*state)->src_node != NULL &&
4259 pf_src_connlimit(state)) {
4260 REASON_SET(reason, PFRES_SRCLIMIT);
4263 } else if (dst->state == TCPS_CLOSING) {
4264 dst->state = TCPS_FIN_WAIT_2;
4265 } else if (src->state == TCPS_SYN_SENT &&
4266 dst->state < TCPS_SYN_SENT) {
4268 * Handle a special sloppy case where we only see one
4269 * half of the connection. If there is a ACK after
4270 * the initial SYN without ever seeing a packet from
4271 * the destination, set the connection to established.
4273 dst->state = src->state = TCPS_ESTABLISHED;
4274 if ((*state)->src_node != NULL &&
4275 pf_src_connlimit(state)) {
4276 REASON_SET(reason, PFRES_SRCLIMIT);
4279 } else if (src->state == TCPS_CLOSING &&
4280 dst->state == TCPS_ESTABLISHED &&
4283 * Handle the closing of half connections where we
4284 * don't see the full bidirectional FIN/ACK+ACK
4287 dst->state = TCPS_CLOSING;
4290 if (th->th_flags & TH_RST)
4291 src->state = dst->state = TCPS_TIME_WAIT;
4293 /* update expire time */
4294 (*state)->expire = time_second;
4295 if (src->state >= TCPS_FIN_WAIT_2 &&
4296 dst->state >= TCPS_FIN_WAIT_2)
4297 (*state)->timeout = PFTM_TCP_CLOSED;
4298 else if (src->state >= TCPS_CLOSING &&
4299 dst->state >= TCPS_CLOSING)
4300 (*state)->timeout = PFTM_TCP_FIN_WAIT;
4301 else if (src->state < TCPS_ESTABLISHED ||
4302 dst->state < TCPS_ESTABLISHED)
4303 (*state)->timeout = PFTM_TCP_OPENING;
4304 else if (src->state >= TCPS_CLOSING ||
4305 dst->state >= TCPS_CLOSING)
4306 (*state)->timeout = PFTM_TCP_CLOSING;
4308 (*state)->timeout = PFTM_TCP_ESTABLISHED;
4314 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
4315 struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
4318 struct pf_state_key_cmp key;
4319 struct tcphdr *th = pd->hdr.tcp;
4321 struct pf_state_peer *src, *dst;
4322 struct pf_state_key *sk;
4325 key.proto = IPPROTO_TCP;
4326 if (direction == PF_IN) { /* wire side, straight */
4327 PF_ACPY(&key.addr[0], pd->src, key.af);
4328 PF_ACPY(&key.addr[1], pd->dst, key.af);
4329 key.port[0] = th->th_sport;
4330 key.port[1] = th->th_dport;
4331 } else { /* stack side, reverse */
4332 PF_ACPY(&key.addr[1], pd->src, key.af);
4333 PF_ACPY(&key.addr[0], pd->dst, key.af);
4334 key.port[1] = th->th_sport;
4335 key.port[0] = th->th_dport;
4338 STATE_LOOKUP(kif, &key, direction, *state, m);
4340 if (direction == (*state)->direction) {
4341 src = &(*state)->src;
4342 dst = &(*state)->dst;
4344 src = &(*state)->dst;
4345 dst = &(*state)->src;
4348 sk = (*state)->key[pd->didx];
4350 if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
4351 if (direction != (*state)->direction) {
4352 REASON_SET(reason, PFRES_SYNPROXY);
4353 return (PF_SYNPROXY_DROP);
4355 if (th->th_flags & TH_SYN) {
4356 if (ntohl(th->th_seq) != (*state)->src.seqlo) {
4357 REASON_SET(reason, PFRES_SYNPROXY);
4360 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
4361 pd->src, th->th_dport, th->th_sport,
4362 (*state)->src.seqhi, ntohl(th->th_seq) + 1,
4363 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1,
4365 REASON_SET(reason, PFRES_SYNPROXY);
4366 return (PF_SYNPROXY_DROP);
4367 } else if (!(th->th_flags & TH_ACK) ||
4368 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4369 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4370 REASON_SET(reason, PFRES_SYNPROXY);
4372 } else if ((*state)->src_node != NULL &&
4373 pf_src_connlimit(state)) {
4374 REASON_SET(reason, PFRES_SRCLIMIT);
4377 (*state)->src.state = PF_TCPS_PROXY_DST;
4379 if ((*state)->src.state == PF_TCPS_PROXY_DST) {
4380 if (direction == (*state)->direction) {
4381 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
4382 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4383 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4384 REASON_SET(reason, PFRES_SYNPROXY);
4387 (*state)->src.max_win = MAX(ntohs(th->th_win), 1);
4388 if ((*state)->dst.seqhi == 1)
4389 (*state)->dst.seqhi = htonl(karc4random());
4390 pf_send_tcp((*state)->rule.ptr, pd->af,
4391 &sk->addr[pd->sidx], &sk->addr[pd->didx],
4392 sk->port[pd->sidx], sk->port[pd->didx],
4393 (*state)->dst.seqhi, 0, TH_SYN, 0,
4394 (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL);
4395 REASON_SET(reason, PFRES_SYNPROXY);
4396 return (PF_SYNPROXY_DROP);
4397 } else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
4399 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) {
4400 REASON_SET(reason, PFRES_SYNPROXY);
4403 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
4404 (*state)->dst.seqlo = ntohl(th->th_seq);
4405 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
4406 pd->src, th->th_dport, th->th_sport,
4407 ntohl(th->th_ack), ntohl(th->th_seq) + 1,
4408 TH_ACK, (*state)->src.max_win, 0, 0, 0,
4409 (*state)->tag, NULL, NULL);
4410 pf_send_tcp((*state)->rule.ptr, pd->af,
4411 &sk->addr[pd->sidx], &sk->addr[pd->didx],
4412 sk->port[pd->sidx], sk->port[pd->didx],
4413 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
4414 TH_ACK, (*state)->dst.max_win, 0, 0, 1,
4416 (*state)->src.seqdiff = (*state)->dst.seqhi -
4417 (*state)->src.seqlo;
4418 (*state)->dst.seqdiff = (*state)->src.seqhi -
4419 (*state)->dst.seqlo;
4420 (*state)->src.seqhi = (*state)->src.seqlo +
4421 (*state)->dst.max_win;
4422 (*state)->dst.seqhi = (*state)->dst.seqlo +
4423 (*state)->src.max_win;
4424 (*state)->src.wscale = (*state)->dst.wscale = 0;
4425 (*state)->src.state = (*state)->dst.state =
4427 REASON_SET(reason, PFRES_SYNPROXY);
4428 return (PF_SYNPROXY_DROP);
4432 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) &&
4433 dst->state >= TCPS_FIN_WAIT_2 &&
4434 src->state >= TCPS_FIN_WAIT_2) {
4435 if (pf_status.debug >= PF_DEBUG_MISC) {
4436 kprintf("pf: state reuse ");
4437 pf_print_state(*state);
4438 pf_print_flags(th->th_flags);
4441 /* XXX make sure it's the same direction ?? */
4442 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
4443 pf_unlink_state(*state);
4448 if ((*state)->state_flags & PFSTATE_SLOPPY) {
4449 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP)
4452 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason,
4453 ©back) == PF_DROP)
4457 /* translate source/destination address, if necessary */
4458 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4459 struct pf_state_key *nk = (*state)->key[pd->didx];
4461 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4462 nk->port[pd->sidx] != th->th_sport) {
4464 * The translated source address may be completely
4465 * unrelated to the saved link header, make sure
4466 * a bridge doesn't try to use it.
4468 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
4469 m->m_flags &= ~M_HASH;
4470 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum,
4471 &th->th_sum, &nk->addr[pd->sidx],
4472 nk->port[pd->sidx], 0, pd->af);
4475 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4476 nk->port[pd->didx] != th->th_dport) {
4478 * If we don't redispatch the packet will go into
4479 * the protocol stack on the wrong cpu for the
4480 * post-translated address.
4482 m->m_flags &= ~M_HASH;
4483 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum,
4484 &th->th_sum, &nk->addr[pd->didx],
4485 nk->port[pd->didx], 0, pd->af);
4490 /* Copyback sequence modulation or stateful scrub changes if needed */
4492 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4498 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
4499 struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4501 struct pf_state_peer *src, *dst;
4502 struct pf_state_key_cmp key;
4503 struct udphdr *uh = pd->hdr.udp;
4506 key.proto = IPPROTO_UDP;
4507 if (direction == PF_IN) { /* wire side, straight */
4508 PF_ACPY(&key.addr[0], pd->src, key.af);
4509 PF_ACPY(&key.addr[1], pd->dst, key.af);
4510 key.port[0] = uh->uh_sport;
4511 key.port[1] = uh->uh_dport;
4512 } else { /* stack side, reverse */
4513 PF_ACPY(&key.addr[1], pd->src, key.af);
4514 PF_ACPY(&key.addr[0], pd->dst, key.af);
4515 key.port[1] = uh->uh_sport;
4516 key.port[0] = uh->uh_dport;
4519 STATE_LOOKUP(kif, &key, direction, *state, m);
4521 if (direction == (*state)->direction) {
4522 src = &(*state)->src;
4523 dst = &(*state)->dst;
4525 src = &(*state)->dst;
4526 dst = &(*state)->src;
4530 if (src->state < PFUDPS_SINGLE)
4531 src->state = PFUDPS_SINGLE;
4532 if (dst->state == PFUDPS_SINGLE)
4533 dst->state = PFUDPS_MULTIPLE;
4535 /* update expire time */
4536 (*state)->expire = time_second;
4537 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
4538 (*state)->timeout = PFTM_UDP_MULTIPLE;
4540 (*state)->timeout = PFTM_UDP_SINGLE;
4542 /* translate source/destination address, if necessary */
4543 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4544 struct pf_state_key *nk = (*state)->key[pd->didx];
4546 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4547 nk->port[pd->sidx] != uh->uh_sport) {
4549 * The translated source address may be completely
4550 * unrelated to the saved link header, make sure
4551 * a bridge doesn't try to use it.
4553 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
4554 m->m_flags &= ~M_HASH;
4555 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum,
4556 &uh->uh_sum, &nk->addr[pd->sidx],
4557 nk->port[pd->sidx], 1, pd->af);
4560 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4561 nk->port[pd->didx] != uh->uh_dport) {
4563 * If we don't redispatch the packet will go into
4564 * the protocol stack on the wrong cpu for the
4565 * post-translated address.
4567 m->m_flags &= ~M_HASH;
4568 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum,
4569 &uh->uh_sum, &nk->addr[pd->didx],
4570 nk->port[pd->didx], 1, pd->af);
4572 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
4579 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
4580 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason)
4582 struct pf_addr *saddr = pd->src, *daddr = pd->dst;
4583 u_int16_t icmpid = 0, *icmpsum;
4586 struct pf_state_key_cmp key;
4588 switch (pd->proto) {
4591 icmptype = pd->hdr.icmp->icmp_type;
4592 icmpid = pd->hdr.icmp->icmp_id;
4593 icmpsum = &pd->hdr.icmp->icmp_cksum;
4595 if (icmptype == ICMP_UNREACH ||
4596 icmptype == ICMP_SOURCEQUENCH ||
4597 icmptype == ICMP_REDIRECT ||
4598 icmptype == ICMP_TIMXCEED ||
4599 icmptype == ICMP_PARAMPROB)
4604 case IPPROTO_ICMPV6:
4605 icmptype = pd->hdr.icmp6->icmp6_type;
4606 icmpid = pd->hdr.icmp6->icmp6_id;
4607 icmpsum = &pd->hdr.icmp6->icmp6_cksum;
4609 if (icmptype == ICMP6_DST_UNREACH ||
4610 icmptype == ICMP6_PACKET_TOO_BIG ||
4611 icmptype == ICMP6_TIME_EXCEEDED ||
4612 icmptype == ICMP6_PARAM_PROB)
4621 * ICMP query/reply message not related to a TCP/UDP packet.
4622 * Search for an ICMP state.
4625 key.proto = pd->proto;
4626 key.port[0] = key.port[1] = icmpid;
4627 if (direction == PF_IN) { /* wire side, straight */
4628 PF_ACPY(&key.addr[0], pd->src, key.af);
4629 PF_ACPY(&key.addr[1], pd->dst, key.af);
4630 } else { /* stack side, reverse */
4631 PF_ACPY(&key.addr[1], pd->src, key.af);
4632 PF_ACPY(&key.addr[0], pd->dst, key.af);
4635 STATE_LOOKUP(kif, &key, direction, *state, m);
4637 (*state)->expire = time_second;
4638 (*state)->timeout = PFTM_ICMP_ERROR_REPLY;
4640 /* translate source/destination address, if necessary */
4641 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4642 struct pf_state_key *nk = (*state)->key[pd->didx];
4647 if (PF_ANEQ(pd->src,
4648 &nk->addr[pd->sidx], AF_INET))
4649 pf_change_a(&saddr->v4.s_addr,
4651 nk->addr[pd->sidx].v4.s_addr, 0);
4653 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx],
4655 pf_change_a(&daddr->v4.s_addr,
4657 nk->addr[pd->didx].v4.s_addr, 0);
4660 pd->hdr.icmp->icmp_id) {
4661 pd->hdr.icmp->icmp_cksum =
4663 pd->hdr.icmp->icmp_cksum, icmpid,
4664 nk->port[pd->sidx], 0);
4665 pd->hdr.icmp->icmp_id =
4669 m_copyback(m, off, ICMP_MINLEN,
4670 (caddr_t)pd->hdr.icmp);
4675 if (PF_ANEQ(pd->src,
4676 &nk->addr[pd->sidx], AF_INET6))
4678 &pd->hdr.icmp6->icmp6_cksum,
4679 &nk->addr[pd->sidx], 0);
4681 if (PF_ANEQ(pd->dst,
4682 &nk->addr[pd->didx], AF_INET6))
4684 &pd->hdr.icmp6->icmp6_cksum,
4685 &nk->addr[pd->didx], 0);
4688 sizeof(struct icmp6_hdr),
4689 (caddr_t)pd->hdr.icmp6);
4698 * ICMP error message in response to a TCP/UDP packet.
4699 * Extract the inner TCP/UDP header and search for that state.
4702 struct pf_pdesc pd2;
4707 struct ip6_hdr h2_6;
4714 /* Payload packet is from the opposite direction. */
4715 pd2.sidx = (direction == PF_IN) ? 1 : 0;
4716 pd2.didx = (direction == PF_IN) ? 0 : 1;
4720 /* offset of h2 in mbuf chain */
4721 ipoff2 = off + ICMP_MINLEN;
4723 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
4724 NULL, reason, pd2.af)) {
4725 DPFPRINTF(PF_DEBUG_MISC,
4726 ("pf: ICMP error message too short "
4731 * ICMP error messages don't refer to non-first
4734 if (h2.ip_off & htons(IP_OFFMASK)) {
4735 REASON_SET(reason, PFRES_FRAG);
4739 /* offset of protocol header that follows h2 */
4740 off2 = ipoff2 + (h2.ip_hl << 2);
4742 pd2.proto = h2.ip_p;
4743 pd2.src = (struct pf_addr *)&h2.ip_src;
4744 pd2.dst = (struct pf_addr *)&h2.ip_dst;
4745 pd2.ip_sum = &h2.ip_sum;
4750 ipoff2 = off + sizeof(struct icmp6_hdr);
4752 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
4753 NULL, reason, pd2.af)) {
4754 DPFPRINTF(PF_DEBUG_MISC,
4755 ("pf: ICMP error message too short "
4759 pd2.proto = h2_6.ip6_nxt;
4760 pd2.src = (struct pf_addr *)&h2_6.ip6_src;
4761 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
4763 off2 = ipoff2 + sizeof(h2_6);
4765 switch (pd2.proto) {
4766 case IPPROTO_FRAGMENT:
4768 * ICMPv6 error messages for
4769 * non-first fragments
4771 REASON_SET(reason, PFRES_FRAG);
4774 case IPPROTO_HOPOPTS:
4775 case IPPROTO_ROUTING:
4776 case IPPROTO_DSTOPTS: {
4777 /* get next header and header length */
4778 struct ip6_ext opt6;
4780 if (!pf_pull_hdr(m, off2, &opt6,
4781 sizeof(opt6), NULL, reason,
4783 DPFPRINTF(PF_DEBUG_MISC,
4784 ("pf: ICMPv6 short opt\n"));
4787 if (pd2.proto == IPPROTO_AH)
4788 off2 += (opt6.ip6e_len + 2) * 4;
4790 off2 += (opt6.ip6e_len + 1) * 8;
4791 pd2.proto = opt6.ip6e_nxt;
4792 /* goto the next header */
4799 } while (!terminal);
4803 DPFPRINTF(PF_DEBUG_MISC,
4804 ("pf: ICMP AF %d unknown (ip6)\n", pd->af));
4809 switch (pd2.proto) {
4813 struct pf_state_peer *src, *dst;
4818 * Only the first 8 bytes of the TCP header can be
4819 * expected. Don't access any TCP header fields after
4820 * th_seq, an ackskew test is not possible.
4822 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason,
4824 DPFPRINTF(PF_DEBUG_MISC,
4825 ("pf: ICMP error message too short "
4831 key.proto = IPPROTO_TCP;
4832 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4833 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4834 key.port[pd2.sidx] = th.th_sport;
4835 key.port[pd2.didx] = th.th_dport;
4837 STATE_LOOKUP(kif, &key, direction, *state, m);
4839 if (direction == (*state)->direction) {
4840 src = &(*state)->dst;
4841 dst = &(*state)->src;
4843 src = &(*state)->src;
4844 dst = &(*state)->dst;
4847 if (src->wscale && dst->wscale)
4848 dws = dst->wscale & PF_WSCALE_MASK;
4852 /* Demodulate sequence number */
4853 seq = ntohl(th.th_seq) - src->seqdiff;
4855 pf_change_a(&th.th_seq, icmpsum,
4860 if (!((*state)->state_flags & PFSTATE_SLOPPY) &&
4861 (!SEQ_GEQ(src->seqhi, seq) ||
4862 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) {
4863 if (pf_status.debug >= PF_DEBUG_MISC) {
4864 kprintf("pf: BAD ICMP %d:%d ",
4865 icmptype, pd->hdr.icmp->icmp_code);
4866 pf_print_host(pd->src, 0, pd->af);
4868 pf_print_host(pd->dst, 0, pd->af);
4869 kprintf(" state: ");
4870 pf_print_state(*state);
4871 kprintf(" seq=%u\n", seq);
4873 REASON_SET(reason, PFRES_BADSTATE);
4876 if (pf_status.debug >= PF_DEBUG_MISC) {
4877 kprintf("pf: OK ICMP %d:%d ",
4878 icmptype, pd->hdr.icmp->icmp_code);
4879 pf_print_host(pd->src, 0, pd->af);
4881 pf_print_host(pd->dst, 0, pd->af);
4882 kprintf(" state: ");
4883 pf_print_state(*state);
4884 kprintf(" seq=%u\n", seq);
4888 /* translate source/destination address, if necessary */
4889 if ((*state)->key[PF_SK_WIRE] !=
4890 (*state)->key[PF_SK_STACK]) {
4891 struct pf_state_key *nk =
4892 (*state)->key[pd->didx];
4894 if (PF_ANEQ(pd2.src,
4895 &nk->addr[pd2.sidx], pd2.af) ||
4896 nk->port[pd2.sidx] != th.th_sport)
4897 pf_change_icmp(pd2.src, &th.th_sport,
4898 daddr, &nk->addr[pd2.sidx],
4899 nk->port[pd2.sidx], NULL,
4900 pd2.ip_sum, icmpsum,
4901 pd->ip_sum, 0, pd2.af);
4903 if (PF_ANEQ(pd2.dst,
4904 &nk->addr[pd2.didx], pd2.af) ||
4905 nk->port[pd2.didx] != th.th_dport)
4906 pf_change_icmp(pd2.dst, &th.th_dport,
4907 NULL, /* XXX Inbound NAT? */
4908 &nk->addr[pd2.didx],
4909 nk->port[pd2.didx], NULL,
4910 pd2.ip_sum, icmpsum,
4911 pd->ip_sum, 0, pd2.af);
4919 m_copyback(m, off, ICMP_MINLEN,
4920 (caddr_t)pd->hdr.icmp);
4921 m_copyback(m, ipoff2, sizeof(h2),
4928 sizeof(struct icmp6_hdr),
4929 (caddr_t)pd->hdr.icmp6);
4930 m_copyback(m, ipoff2, sizeof(h2_6),
4935 m_copyback(m, off2, 8, (caddr_t)&th);
4944 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
4945 NULL, reason, pd2.af)) {
4946 DPFPRINTF(PF_DEBUG_MISC,
4947 ("pf: ICMP error message too short "
4953 key.proto = IPPROTO_UDP;
4954 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4955 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4956 key.port[pd2.sidx] = uh.uh_sport;
4957 key.port[pd2.didx] = uh.uh_dport;
4959 STATE_LOOKUP(kif, &key, direction, *state, m);
4961 /* translate source/destination address, if necessary */
4962 if ((*state)->key[PF_SK_WIRE] !=
4963 (*state)->key[PF_SK_STACK]) {
4964 struct pf_state_key *nk =
4965 (*state)->key[pd->didx];
4967 if (PF_ANEQ(pd2.src,
4968 &nk->addr[pd2.sidx], pd2.af) ||
4969 nk->port[pd2.sidx] != uh.uh_sport)
4970 pf_change_icmp(pd2.src, &uh.uh_sport,
4971 daddr, &nk->addr[pd2.sidx],
4972 nk->port[pd2.sidx], &uh.uh_sum,
4973 pd2.ip_sum, icmpsum,
4974 pd->ip_sum, 1, pd2.af);
4976 if (PF_ANEQ(pd2.dst,
4977 &nk->addr[pd2.didx], pd2.af) ||
4978 nk->port[pd2.didx] != uh.uh_dport)
4979 pf_change_icmp(pd2.dst, &uh.uh_dport,
4980 NULL, /* XXX Inbound NAT? */
4981 &nk->addr[pd2.didx],
4982 nk->port[pd2.didx], &uh.uh_sum,
4983 pd2.ip_sum, icmpsum,
4984 pd->ip_sum, 1, pd2.af);
4989 m_copyback(m, off, ICMP_MINLEN,
4990 (caddr_t)pd->hdr.icmp);
4991 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4997 sizeof(struct icmp6_hdr),
4998 (caddr_t)pd->hdr.icmp6);
4999 m_copyback(m, ipoff2, sizeof(h2_6),
5004 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh);
5011 case IPPROTO_ICMP: {
5014 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
5015 NULL, reason, pd2.af)) {
5016 DPFPRINTF(PF_DEBUG_MISC,
5017 ("pf: ICMP error message too short i"
5023 key.proto = IPPROTO_ICMP;
5024 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5025 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5026 key.port[0] = key.port[1] = iih.icmp_id;
5028 STATE_LOOKUP(kif, &key, direction, *state, m);
5030 /* translate source/destination address, if necessary */
5031 if ((*state)->key[PF_SK_WIRE] !=
5032 (*state)->key[PF_SK_STACK]) {
5033 struct pf_state_key *nk =
5034 (*state)->key[pd->didx];
5036 if (PF_ANEQ(pd2.src,
5037 &nk->addr[pd2.sidx], pd2.af) ||
5038 nk->port[pd2.sidx] != iih.icmp_id)
5039 pf_change_icmp(pd2.src, &iih.icmp_id,
5040 daddr, &nk->addr[pd2.sidx],
5041 nk->port[pd2.sidx], NULL,
5042 pd2.ip_sum, icmpsum,
5043 pd->ip_sum, 0, AF_INET);
5045 if (PF_ANEQ(pd2.dst,
5046 &nk->addr[pd2.didx], pd2.af) ||
5047 nk->port[pd2.didx] != iih.icmp_id)
5048 pf_change_icmp(pd2.dst, &iih.icmp_id,
5049 NULL, /* XXX Inbound NAT? */
5050 &nk->addr[pd2.didx],
5051 nk->port[pd2.didx], NULL,
5052 pd2.ip_sum, icmpsum,
5053 pd->ip_sum, 0, AF_INET);
5055 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
5056 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5057 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih);
5064 case IPPROTO_ICMPV6: {
5065 struct icmp6_hdr iih;
5067 if (!pf_pull_hdr(m, off2, &iih,
5068 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) {
5069 DPFPRINTF(PF_DEBUG_MISC,
5070 ("pf: ICMP error message too short "
5076 key.proto = IPPROTO_ICMPV6;
5077 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5078 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5079 key.port[0] = key.port[1] = iih.icmp6_id;
5081 STATE_LOOKUP(kif, &key, direction, *state, m);
5083 /* translate source/destination address, if necessary */
5084 if ((*state)->key[PF_SK_WIRE] !=
5085 (*state)->key[PF_SK_STACK]) {
5086 struct pf_state_key *nk =
5087 (*state)->key[pd->didx];
5089 if (PF_ANEQ(pd2.src,
5090 &nk->addr[pd2.sidx], pd2.af) ||
5091 nk->port[pd2.sidx] != iih.icmp6_id)
5092 pf_change_icmp(pd2.src, &iih.icmp6_id,
5093 daddr, &nk->addr[pd2.sidx],
5094 nk->port[pd2.sidx], NULL,
5095 pd2.ip_sum, icmpsum,
5096 pd->ip_sum, 0, AF_INET6);
5098 if (PF_ANEQ(pd2.dst,
5099 &nk->addr[pd2.didx], pd2.af) ||
5100 nk->port[pd2.didx] != iih.icmp6_id)
5101 pf_change_icmp(pd2.dst, &iih.icmp6_id,
5102 NULL, /* XXX Inbound NAT? */
5103 &nk->addr[pd2.didx],
5104 nk->port[pd2.didx], NULL,
5105 pd2.ip_sum, icmpsum,
5106 pd->ip_sum, 0, AF_INET6);
5108 m_copyback(m, off, sizeof(struct icmp6_hdr),
5109 (caddr_t)pd->hdr.icmp6);
5110 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6);
5111 m_copyback(m, off2, sizeof(struct icmp6_hdr),
5121 key.proto = pd2.proto;
5122 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5123 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5124 key.port[0] = key.port[1] = 0;
5126 STATE_LOOKUP(kif, &key, direction, *state, m);
5128 /* translate source/destination address, if necessary */
5129 if ((*state)->key[PF_SK_WIRE] !=
5130 (*state)->key[PF_SK_STACK]) {
5131 struct pf_state_key *nk =
5132 (*state)->key[pd->didx];
5134 if (PF_ANEQ(pd2.src,
5135 &nk->addr[pd2.sidx], pd2.af))
5136 pf_change_icmp(pd2.src, NULL, daddr,
5137 &nk->addr[pd2.sidx], 0, NULL,
5138 pd2.ip_sum, icmpsum,
5139 pd->ip_sum, 0, pd2.af);
5141 if (PF_ANEQ(pd2.dst,
5142 &nk->addr[pd2.didx], pd2.af))
5143 pf_change_icmp(pd2.src, NULL,
5144 NULL, /* XXX Inbound NAT? */
5145 &nk->addr[pd2.didx], 0, NULL,
5146 pd2.ip_sum, icmpsum,
5147 pd->ip_sum, 0, pd2.af);
5152 m_copyback(m, off, ICMP_MINLEN,
5153 (caddr_t)pd->hdr.icmp);
5154 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5160 sizeof(struct icmp6_hdr),
5161 (caddr_t)pd->hdr.icmp6);
5162 m_copyback(m, ipoff2, sizeof(h2_6),
5176 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
5177 struct mbuf *m, struct pf_pdesc *pd)
5179 struct pf_state_peer *src, *dst;
5180 struct pf_state_key_cmp key;
5183 key.proto = pd->proto;
5184 if (direction == PF_IN) {
5185 PF_ACPY(&key.addr[0], pd->src, key.af);
5186 PF_ACPY(&key.addr[1], pd->dst, key.af);
5187 key.port[0] = key.port[1] = 0;
5189 PF_ACPY(&key.addr[1], pd->src, key.af);
5190 PF_ACPY(&key.addr[0], pd->dst, key.af);
5191 key.port[1] = key.port[0] = 0;
5194 STATE_LOOKUP(kif, &key, direction, *state, m);
5196 if (direction == (*state)->direction) {
5197 src = &(*state)->src;
5198 dst = &(*state)->dst;
5200 src = &(*state)->dst;
5201 dst = &(*state)->src;
5205 if (src->state < PFOTHERS_SINGLE)
5206 src->state = PFOTHERS_SINGLE;
5207 if (dst->state == PFOTHERS_SINGLE)
5208 dst->state = PFOTHERS_MULTIPLE;
5210 /* update expire time */
5211 (*state)->expire = time_second;
5212 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
5213 (*state)->timeout = PFTM_OTHER_MULTIPLE;
5215 (*state)->timeout = PFTM_OTHER_SINGLE;
5217 /* translate source/destination address, if necessary */
5218 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
5219 struct pf_state_key *nk = (*state)->key[pd->didx];
5228 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
5229 pf_change_a(&pd->src->v4.s_addr,
5231 nk->addr[pd->sidx].v4.s_addr,
5235 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5236 pf_change_a(&pd->dst->v4.s_addr,
5238 nk->addr[pd->didx].v4.s_addr,
5245 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
5246 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af);
5248 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5249 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af);
5257 * ipoff and off are measured from the start of the mbuf chain.
5258 * h must be at "ipoff" on the mbuf chain.
5261 pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
5262 u_short *actionp, u_short *reasonp, sa_family_t af)
5267 struct ip *h = mtod(m, struct ip *);
5268 u_int16_t fragoff = (h->ip_off & IP_OFFMASK) << 3;
5272 ACTION_SET(actionp, PF_PASS);
5274 ACTION_SET(actionp, PF_DROP);
5275 REASON_SET(reasonp, PFRES_FRAG);
5279 if (m->m_pkthdr.len < off + len ||
5280 h->ip_len < off + len) {
5281 ACTION_SET(actionp, PF_DROP);
5282 REASON_SET(reasonp, PFRES_SHORT);
5290 struct ip6_hdr *h = mtod(m, struct ip6_hdr *);
5292 if (m->m_pkthdr.len < off + len ||
5293 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
5294 (unsigned)(off + len)) {
5295 ACTION_SET(actionp, PF_DROP);
5296 REASON_SET(reasonp, PFRES_SHORT);
5303 m_copydata(m, off, len, p);
5308 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif)
5310 struct sockaddr_in *dst;
5314 struct sockaddr_in6 *dst6;
5315 struct route_in6 ro;
5319 struct radix_node *rn;
5324 bzero(&ro, sizeof(ro));
5327 dst = satosin(&ro.ro_dst);
5328 dst->sin_family = AF_INET;
5329 dst->sin_len = sizeof(*dst);
5330 dst->sin_addr = addr->v4;
5334 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
5335 dst6->sin6_family = AF_INET6;
5336 dst6->sin6_len = sizeof(*dst6);
5337 dst6->sin6_addr = addr->v6;
5344 /* Skip checks for ipsec interfaces */
5345 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
5348 rtalloc_ign((struct route *)&ro, 0);
5350 if (ro.ro_rt != NULL) {
5351 /* No interface given, this is a no-route check */
5355 if (kif->pfik_ifp == NULL) {
5360 /* Perform uRPF check if passed input interface */
5362 rn = (struct radix_node *)ro.ro_rt;
5364 rt = (struct rtentry *)rn;
5367 if (kif->pfik_ifp == ifp)
5370 } while (check_mpath == 1 && rn != NULL && ret == 0);
5374 if (ro.ro_rt != NULL)
5380 pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw)
5382 struct sockaddr_in *dst;
5384 struct sockaddr_in6 *dst6;
5385 struct route_in6 ro;
5391 ASSERT_LWKT_TOKEN_HELD(&pf_token);
5393 bzero(&ro, sizeof(ro));
5396 dst = satosin(&ro.ro_dst);
5397 dst->sin_family = AF_INET;
5398 dst->sin_len = sizeof(*dst);
5399 dst->sin_addr = addr->v4;
5403 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
5404 dst6->sin6_family = AF_INET6;
5405 dst6->sin6_len = sizeof(*dst6);
5406 dst6->sin6_addr = addr->v6;
5413 rtalloc_ign((struct route *)&ro, (RTF_CLONING | RTF_PRCLONING));
5415 if (ro.ro_rt != NULL) {
5424 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5425 struct pf_state *s, struct pf_pdesc *pd)
5427 struct mbuf *m0, *m1;
5428 struct route iproute;
5429 struct route *ro = NULL;
5430 struct sockaddr_in *dst;
5432 struct ifnet *ifp = NULL;
5433 struct pf_addr naddr;
5434 struct pf_src_node *sn = NULL;
5441 ASSERT_LWKT_TOKEN_HELD(&pf_token);
5443 if (m == NULL || *m == NULL || r == NULL ||
5444 (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
5445 panic("pf_route: invalid parameters");
5447 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
5448 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
5449 (*m)->m_pkthdr.pf.routed = 1;
5451 if ((*m)->m_pkthdr.pf.routed++ > 3) {
5458 if (r->rt == PF_DUPTO) {
5459 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL) {
5463 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) {
5469 if (m0->m_len < sizeof(struct ip)) {
5470 DPFPRINTF(PF_DEBUG_URGENT,
5471 ("pf_route: m0->m_len < sizeof(struct ip)\n"));
5475 ip = mtod(m0, struct ip *);
5478 bzero((caddr_t)ro, sizeof(*ro));
5479 dst = satosin(&ro->ro_dst);
5480 dst->sin_family = AF_INET;
5481 dst->sin_len = sizeof(*dst);
5482 dst->sin_addr = ip->ip_dst;
5484 if (r->rt == PF_FASTROUTE) {
5486 if (ro->ro_rt == 0) {
5487 ipstat.ips_noroute++;
5491 ifp = ro->ro_rt->rt_ifp;
5492 ro->ro_rt->rt_use++;
5494 if (ro->ro_rt->rt_flags & RTF_GATEWAY)
5495 dst = satosin(ro->ro_rt->rt_gateway);
5497 if (TAILQ_EMPTY(&r->rpool.list)) {
5498 DPFPRINTF(PF_DEBUG_URGENT,
5499 ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n"));
5503 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
5505 if (!PF_AZERO(&naddr, AF_INET))
5506 dst->sin_addr.s_addr = naddr.v4.s_addr;
5507 ifp = r->rpool.cur->kif ?
5508 r->rpool.cur->kif->pfik_ifp : NULL;
5510 if (!PF_AZERO(&s->rt_addr, AF_INET))
5511 dst->sin_addr.s_addr =
5512 s->rt_addr.v4.s_addr;
5513 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5520 if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) {
5522 } else if (m0 == NULL) {
5525 if (m0->m_len < sizeof(struct ip)) {
5526 DPFPRINTF(PF_DEBUG_URGENT,
5527 ("pf_route: m0->m_len < sizeof(struct ip)\n"));
5530 ip = mtod(m0, struct ip *);
5533 /* Copied from FreeBSD 5.1-CURRENT ip_output. */
5534 m0->m_pkthdr.csum_flags |= CSUM_IP;
5535 sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist;
5536 if (sw_csum & CSUM_DELAY_DATA) {
5537 in_delayed_cksum(m0);
5538 sw_csum &= ~CSUM_DELAY_DATA;
5540 m0->m_pkthdr.csum_flags &= ifp->if_hwassist;
5542 if (ip->ip_len <= ifp->if_mtu ||
5543 (ifp->if_hwassist & CSUM_FRAGMENT &&
5544 (ip->ip_off & IP_DF) == 0)) {
5545 ip->ip_len = htons(ip->ip_len);
5546 ip->ip_off = htons(ip->ip_off);
5548 if (sw_csum & CSUM_DELAY_IP) {
5550 if (ip->ip_v == IPVERSION &&
5551 (ip->ip_hl << 2) == sizeof(*ip)) {
5552 ip->ip_sum = in_cksum_hdr(ip);
5554 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
5557 lwkt_reltoken(&pf_token);
5558 error = ifp->if_output(ifp, m0, sintosa(dst), ro->ro_rt);
5559 lwkt_gettoken(&pf_token);
5564 * Too large for interface; fragment if possible.
5565 * Must be able to put at least 8 bytes per fragment.
5567 if (ip->ip_off & IP_DF) {
5568 ipstat.ips_cantfrag++;
5569 if (r->rt != PF_DUPTO) {
5570 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
5578 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum);
5583 for (m0 = m1; m0; m0 = m1) {
5587 lwkt_reltoken(&pf_token);
5588 error = (*ifp->if_output)(ifp, m0, sintosa(dst),
5590 lwkt_gettoken(&pf_token);
5596 ipstat.ips_fragmented++;
5599 if (r->rt != PF_DUPTO)
5601 if (ro == &iproute && ro->ro_rt)
5613 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5614 struct pf_state *s, struct pf_pdesc *pd)
5617 struct route_in6 ip6route;
5618 struct route_in6 *ro;
5619 struct sockaddr_in6 *dst;
5620 struct ip6_hdr *ip6;
5621 struct ifnet *ifp = NULL;
5622 struct pf_addr naddr;
5623 struct pf_src_node *sn = NULL;
5626 if (m == NULL || *m == NULL || r == NULL ||
5627 (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
5628 panic("pf_route6: invalid parameters");
5630 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
5631 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
5632 (*m)->m_pkthdr.pf.routed = 1;
5634 if ((*m)->m_pkthdr.pf.routed++ > 3) {
5641 if (r->rt == PF_DUPTO) {
5642 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL)
5645 if ((r->rt == PF_REPLYTO) == (r->direction == dir))
5650 if (m0->m_len < sizeof(struct ip6_hdr)) {
5651 DPFPRINTF(PF_DEBUG_URGENT,
5652 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n"));
5655 ip6 = mtod(m0, struct ip6_hdr *);
5658 bzero((caddr_t)ro, sizeof(*ro));
5659 dst = (struct sockaddr_in6 *)&ro->ro_dst;
5660 dst->sin6_family = AF_INET6;
5661 dst->sin6_len = sizeof(*dst);
5662 dst->sin6_addr = ip6->ip6_dst;
5665 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
5666 * so make sure pf.flags is clear.
5668 * Cheat. XXX why only in the v6 case???
5670 if (r->rt == PF_FASTROUTE) {
5671 m0->m_pkthdr.fw_flags |= PF_MBUF_TAGGED;
5672 m0->m_pkthdr.pf.flags = 0;
5673 /* XXX Re-Check when Upgrading to > 4.4 */
5674 m0->m_pkthdr.pf.statekey = NULL;
5675 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL);
5679 if (TAILQ_EMPTY(&r->rpool.list)) {
5680 DPFPRINTF(PF_DEBUG_URGENT,
5681 ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n"));
5685 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
5687 if (!PF_AZERO(&naddr, AF_INET6))
5688 PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5690 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
5692 if (!PF_AZERO(&s->rt_addr, AF_INET6))
5693 PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5694 &s->rt_addr, AF_INET6);
5695 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5701 if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) {
5703 } else if (m0 == NULL) {
5706 if (m0->m_len < sizeof(struct ip6_hdr)) {
5707 DPFPRINTF(PF_DEBUG_URGENT,
5708 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n"));
5711 ip6 = mtod(m0, struct ip6_hdr *);
5715 * If the packet is too large for the outgoing interface,
5716 * send back an icmp6 error.
5718 if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr))
5719 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
5720 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) {
5721 error = nd6_output(ifp, ifp, m0, dst, NULL);
5723 in6_ifstat_inc(ifp, ifs6_in_toobig);
5724 if (r->rt != PF_DUPTO)
5725 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
5731 if (r->rt != PF_DUPTO)
5743 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag
5744 * off is the offset where the protocol header starts
5745 * len is the total length of protocol header plus payload
5746 * returns 0 when the checksum is valid, otherwise returns 1.
5750 * FreeBSD supports cksum offload for the following drivers.
5751 * em(4), gx(4), lge(4), nge(4), ti(4), xl(4)
5752 * If we can make full use of it we would outperform ipfw/ipfilter in
5753 * very heavy traffic.
5754 * I have not tested 'cause I don't have NICs that supports cksum offload.
5755 * (There might be problems. Typical phenomena would be
5756 * 1. No route message for UDP packet.
5757 * 2. No connection acceptance from external hosts regardless of rule set.)
5760 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p,
5767 if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
5769 if (m->m_pkthdr.len < off + len)
5775 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5776 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5777 sum = m->m_pkthdr.csum_data;
5779 ip = mtod(m, struct ip *);
5780 sum = in_pseudo(ip->ip_src.s_addr,
5781 ip->ip_dst.s_addr, htonl((u_short)len +
5782 m->m_pkthdr.csum_data + p));
5790 case IPPROTO_ICMPV6:
5800 if (p == IPPROTO_ICMP) {
5805 sum = in_cksum(m, len);
5809 if (m->m_len < sizeof(struct ip))
5811 sum = in_cksum_range(m, p, off, len);
5813 m->m_pkthdr.csum_flags |=
5816 m->m_pkthdr.csum_data = 0xffff;
5822 if (m->m_len < sizeof(struct ip6_hdr))
5824 sum = in6_cksum(m, p, off, len);
5827 * IPv6 H/W cksum off-load not supported yet!
5830 * m->m_pkthdr.csum_flags |=
5831 * (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
5832 * m->m_pkthdr.csum_data = 0xffff;
5844 tcpstat.tcps_rcvbadsum++;
5847 udpstat.udps_badsum++;
5850 icmpstat.icps_checksum++;
5853 case IPPROTO_ICMPV6:
5854 icmp6stat.icp6s_checksum++;
5864 pf_find_divert(struct mbuf *m)
5868 if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL)
5871 return ((struct pf_divert *)(mtag + 1));
5875 pf_get_divert(struct mbuf *m)
5879 if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL) {
5880 mtag = m_tag_get(PACKET_TAG_PF_DIVERT, sizeof(struct pf_divert),
5884 bzero(mtag + 1, sizeof(struct pf_divert));
5885 m_tag_prepend(m, mtag);
5888 return ((struct pf_divert *)(mtag + 1));
5893 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0,
5894 struct ether_header *eh, struct inpcb *inp)
5896 struct pfi_kif *kif;
5897 u_short action, reason = 0, log = 0;
5898 struct mbuf *m = *m0;
5899 struct ip *h = NULL;
5900 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr;
5901 struct pf_state *s = NULL;
5902 struct pf_ruleset *ruleset = NULL;
5904 int off, dirndx, pqid = 0;
5906 if (!pf_status.running)
5909 memset(&pd, 0, sizeof(pd));
5910 if (ifp->if_type == IFT_CARP && ifp->if_carpdev)
5911 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif;
5913 kif = (struct pfi_kif *)ifp->if_pf_kif;
5916 DPFPRINTF(PF_DEBUG_URGENT,
5917 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname));
5920 if (kif->pfik_flags & PFI_IFLAG_SKIP)
5924 if ((m->m_flags & M_PKTHDR) == 0)
5925 panic("non-M_PKTHDR is passed to pf_test");
5926 #endif /* DIAGNOSTIC */
5928 if (m->m_pkthdr.len < (int)sizeof(*h)) {
5930 REASON_SET(&reason, PFRES_SHORT);
5936 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
5937 * so make sure pf.flags is clear.
5939 if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED)
5941 m->m_pkthdr.pf.flags = 0;
5942 /* Re-Check when updating to > 4.4 */
5943 m->m_pkthdr.pf.statekey = NULL;
5945 /* We do IP header normalization and packet reassembly here */
5946 if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) {
5950 m = *m0; /* pf_normalize messes with m0 */
5951 h = mtod(m, struct ip *);
5953 off = h->ip_hl << 2;
5954 if (off < (int)sizeof(*h)) {
5956 REASON_SET(&reason, PFRES_SHORT);
5961 pd.src = (struct pf_addr *)&h->ip_src;
5962 pd.dst = (struct pf_addr *)&h->ip_dst;
5963 pd.sport = pd.dport = NULL;
5964 pd.ip_sum = &h->ip_sum;
5965 pd.proto_sum = NULL;
5968 pd.sidx = (dir == PF_IN) ? 0 : 1;
5969 pd.didx = (dir == PF_IN) ? 1 : 0;
5972 pd.tot_len = h->ip_len;
5975 /* handle fragments that didn't get reassembled by normalization */
5976 if (h->ip_off & (IP_MF | IP_OFFMASK)) {
5977 action = pf_test_fragment(&r, dir, kif, m, h,
5988 if (!pf_pull_hdr(m, off, &th, sizeof(th),
5989 &action, &reason, AF_INET)) {
5990 log = action != PF_PASS;
5993 pd.p_len = pd.tot_len - off - (th.th_off << 2);
5994 if ((th.th_flags & TH_ACK) && pd.p_len == 0)
5996 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
5997 if (action == PF_DROP)
5999 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
6001 if (action == PF_PASS) {
6002 pfsync_update_state(s);
6006 } else if (s == NULL)
6007 action = pf_test_rule(&r, &s, dir, kif,
6008 m, off, h, &pd, &a, &ruleset, NULL, inp);
6016 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
6017 &action, &reason, AF_INET)) {
6018 log = action != PF_PASS;
6021 if (uh.uh_dport == 0 ||
6022 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
6023 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
6025 REASON_SET(&reason, PFRES_SHORT);
6028 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
6029 if (action == PF_PASS) {
6030 pfsync_update_state(s);
6034 } else if (s == NULL)
6035 action = pf_test_rule(&r, &s, dir, kif,
6036 m, off, h, &pd, &a, &ruleset, NULL, inp);
6040 case IPPROTO_ICMP: {
6044 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
6045 &action, &reason, AF_INET)) {
6046 log = action != PF_PASS;
6049 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd,
6051 if (action == PF_PASS) {
6052 pfsync_update_state(s);
6056 } else if (s == NULL)
6057 action = pf_test_rule(&r, &s, dir, kif,
6058 m, off, h, &pd, &a, &ruleset, NULL, inp);
6063 action = pf_test_state_other(&s, dir, kif, m, &pd);
6064 if (action == PF_PASS) {
6065 pfsync_update_state(s);
6069 } else if (s == NULL)
6070 action = pf_test_rule(&r, &s, dir, kif, m, off, h,
6071 &pd, &a, &ruleset, NULL, inp);
6076 if (action == PF_PASS && h->ip_hl > 5 &&
6077 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
6079 REASON_SET(&reason, PFRES_IPOPTIONS);
6081 DPFPRINTF(PF_DEBUG_MISC,
6082 ("pf: dropping packet with ip options\n"));
6085 if ((s && s->tag) || r->rtableid)
6086 pf_tag_packet(m, s ? s->tag : 0, r->rtableid);
6089 if (dir == PF_IN && s && s->key[PF_SK_STACK])
6090 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK];
6094 if (action == PF_PASS && r->qid) {
6095 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
6096 if (pqid || (pd.tos & IPTOS_LOWDELAY))
6097 m->m_pkthdr.pf.qid = r->pqid;
6099 m->m_pkthdr.pf.qid = r->qid;
6100 m->m_pkthdr.pf.ecn_af = AF_INET;
6101 m->m_pkthdr.pf.hdr = h;
6102 /* add connection hash for fairq */
6105 m->m_pkthdr.pf.state_hash = s->hash;
6106 m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED;
6112 * connections redirected to loopback should not match sockets
6113 * bound specifically to loopback due to security implications,
6114 * see tcp_input() and in_pcblookup_listen().
6116 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
6117 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
6118 (s->nat_rule.ptr->action == PF_RDR ||
6119 s->nat_rule.ptr->action == PF_BINAT) &&
6120 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET)
6121 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST;
6123 if (dir == PF_IN && action == PF_PASS && r->divert.port) {
6124 struct pf_divert *divert;
6126 if ((divert = pf_get_divert(m))) {
6127 m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED;
6128 divert->port = r->divert.port;
6129 divert->addr.ipv4 = r->divert.addr.v4;
6136 if (s != NULL && s->nat_rule.ptr != NULL &&
6137 s->nat_rule.ptr->log & PF_LOG_ALL)
6138 lr = s->nat_rule.ptr;
6141 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset,
6145 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6146 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;
6148 if (action == PF_PASS || r->action == PF_DROP) {
6149 dirndx = (dir == PF_OUT);
6150 r->packets[dirndx]++;
6151 r->bytes[dirndx] += pd.tot_len;
6153 a->packets[dirndx]++;
6154 a->bytes[dirndx] += pd.tot_len;
6157 if (s->nat_rule.ptr != NULL) {
6158 s->nat_rule.ptr->packets[dirndx]++;
6159 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6161 if (s->src_node != NULL) {
6162 s->src_node->packets[dirndx]++;
6163 s->src_node->bytes[dirndx] += pd.tot_len;
6165 if (s->nat_src_node != NULL) {
6166 s->nat_src_node->packets[dirndx]++;
6167 s->nat_src_node->bytes[dirndx] += pd.tot_len;
6169 dirndx = (dir == s->direction) ? 0 : 1;
6170 s->packets[dirndx]++;
6171 s->bytes[dirndx] += pd.tot_len;
6174 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6175 if (nr != NULL && r == &pf_default_rule)
6177 if (tr->src.addr.type == PF_ADDR_TABLE)
6178 pfr_update_stats(tr->src.addr.p.tbl,
6179 (s == NULL) ? pd.src :
6180 &s->key[(s->direction == PF_IN)]->
6181 addr[(s->direction == PF_OUT)],
6182 pd.af, pd.tot_len, dir == PF_OUT,
6183 r->action == PF_PASS, tr->src.neg);
6184 if (tr->dst.addr.type == PF_ADDR_TABLE)
6185 pfr_update_stats(tr->dst.addr.p.tbl,
6186 (s == NULL) ? pd.dst :
6187 &s->key[(s->direction == PF_IN)]->
6188 addr[(s->direction == PF_IN)],
6189 pd.af, pd.tot_len, dir == PF_OUT,
6190 r->action == PF_PASS, tr->dst.neg);
6194 if (action == PF_SYNPROXY_DROP) {
6199 /* pf_route can free the mbuf causing *m0 to become NULL */
6200 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd);
6208 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0,
6209 struct ether_header *eh, struct inpcb *inp)
6211 struct pfi_kif *kif;
6212 u_short action, reason = 0, log = 0;
6213 struct mbuf *m = *m0, *n = NULL;
6214 struct ip6_hdr *h = NULL;
6215 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr;
6216 struct pf_state *s = NULL;
6217 struct pf_ruleset *ruleset = NULL;
6219 int off, terminal = 0, dirndx, rh_cnt = 0;
6221 if (!pf_status.running)
6224 memset(&pd, 0, sizeof(pd));
6225 if (ifp->if_type == IFT_CARP && ifp->if_carpdev)
6226 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif;
6228 kif = (struct pfi_kif *)ifp->if_pf_kif;
6231 DPFPRINTF(PF_DEBUG_URGENT,
6232 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname));
6235 if (kif->pfik_flags & PFI_IFLAG_SKIP)
6239 if ((m->m_flags & M_PKTHDR) == 0)
6240 panic("non-M_PKTHDR is passed to pf_test6");
6241 #endif /* DIAGNOSTIC */
6243 if (m->m_pkthdr.len < (int)sizeof(*h)) {
6245 REASON_SET(&reason, PFRES_SHORT);
6251 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
6252 * so make sure pf.flags is clear.
6254 if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED)
6256 m->m_pkthdr.pf.flags = 0;
6257 /* Re-Check when updating to > 4.4 */
6258 m->m_pkthdr.pf.statekey = NULL;
6260 /* We do IP header normalization and packet reassembly here */
6261 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) {
6265 m = *m0; /* pf_normalize messes with m0 */
6266 h = mtod(m, struct ip6_hdr *);
6270 * we do not support jumbogram yet. if we keep going, zero ip6_plen
6271 * will do something bad, so drop the packet for now.
6273 if (htons(h->ip6_plen) == 0) {
6275 REASON_SET(&reason, PFRES_NORM); /*XXX*/
6280 pd.src = (struct pf_addr *)&h->ip6_src;
6281 pd.dst = (struct pf_addr *)&h->ip6_dst;
6282 pd.sport = pd.dport = NULL;
6284 pd.proto_sum = NULL;
6286 pd.sidx = (dir == PF_IN) ? 0 : 1;
6287 pd.didx = (dir == PF_IN) ? 1 : 0;
6290 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
6293 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
6294 pd.proto = h->ip6_nxt;
6297 case IPPROTO_FRAGMENT:
6298 action = pf_test_fragment(&r, dir, kif, m, h,
6300 if (action == PF_DROP)
6301 REASON_SET(&reason, PFRES_FRAG);
6303 case IPPROTO_ROUTING: {
6304 struct ip6_rthdr rthdr;
6307 DPFPRINTF(PF_DEBUG_MISC,
6308 ("pf: IPv6 more than one rthdr\n"));
6310 REASON_SET(&reason, PFRES_IPOPTIONS);
6314 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL,
6316 DPFPRINTF(PF_DEBUG_MISC,
6317 ("pf: IPv6 short rthdr\n"));
6319 REASON_SET(&reason, PFRES_SHORT);
6323 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) {
6324 DPFPRINTF(PF_DEBUG_MISC,
6325 ("pf: IPv6 rthdr0\n"));
6327 REASON_SET(&reason, PFRES_IPOPTIONS);
6334 case IPPROTO_HOPOPTS:
6335 case IPPROTO_DSTOPTS: {
6336 /* get next header and header length */
6337 struct ip6_ext opt6;
6339 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
6340 NULL, &reason, pd.af)) {
6341 DPFPRINTF(PF_DEBUG_MISC,
6342 ("pf: IPv6 short opt\n"));
6347 if (pd.proto == IPPROTO_AH)
6348 off += (opt6.ip6e_len + 2) * 4;
6350 off += (opt6.ip6e_len + 1) * 8;
6351 pd.proto = opt6.ip6e_nxt;
6352 /* goto the next header */
6359 } while (!terminal);
6361 /* if there's no routing header, use unmodified mbuf for checksumming */
6371 if (!pf_pull_hdr(m, off, &th, sizeof(th),
6372 &action, &reason, AF_INET6)) {
6373 log = action != PF_PASS;
6376 pd.p_len = pd.tot_len - off - (th.th_off << 2);
6377 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
6378 if (action == PF_DROP)
6380 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
6382 if (action == PF_PASS) {
6383 pfsync_update_state(s);
6387 } else if (s == NULL)
6388 action = pf_test_rule(&r, &s, dir, kif,
6389 m, off, h, &pd, &a, &ruleset, NULL, inp);
6397 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
6398 &action, &reason, AF_INET6)) {
6399 log = action != PF_PASS;
6402 if (uh.uh_dport == 0 ||
6403 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
6404 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
6406 REASON_SET(&reason, PFRES_SHORT);
6409 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
6410 if (action == PF_PASS) {
6411 pfsync_update_state(s);
6415 } else if (s == NULL)
6416 action = pf_test_rule(&r, &s, dir, kif,
6417 m, off, h, &pd, &a, &ruleset, NULL, inp);
6421 case IPPROTO_ICMPV6: {
6422 struct icmp6_hdr ih;
6425 if (!pf_pull_hdr(m, off, &ih, sizeof(ih),
6426 &action, &reason, AF_INET6)) {
6427 log = action != PF_PASS;
6430 action = pf_test_state_icmp(&s, dir, kif,
6431 m, off, h, &pd, &reason);
6432 if (action == PF_PASS) {
6433 pfsync_update_state(s);
6437 } else if (s == NULL)
6438 action = pf_test_rule(&r, &s, dir, kif,
6439 m, off, h, &pd, &a, &ruleset, NULL, inp);
6444 action = pf_test_state_other(&s, dir, kif, m, &pd);
6445 if (action == PF_PASS) {
6446 pfsync_update_state(s);
6450 } else if (s == NULL)
6451 action = pf_test_rule(&r, &s, dir, kif, m, off, h,
6452 &pd, &a, &ruleset, NULL, inp);
6462 /* handle dangerous IPv6 extension headers. */
6463 if (action == PF_PASS && rh_cnt &&
6464 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
6466 REASON_SET(&reason, PFRES_IPOPTIONS);
6468 DPFPRINTF(PF_DEBUG_MISC,
6469 ("pf: dropping packet with dangerous v6 headers\n"));
6472 if ((s && s->tag) || r->rtableid)
6473 pf_tag_packet(m, s ? s->tag : 0, r->rtableid);
6476 if (dir == PF_IN && s && s->key[PF_SK_STACK])
6477 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK];
6481 if (action == PF_PASS && r->qid) {
6482 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
6483 if (pd.tos & IPTOS_LOWDELAY)
6484 m->m_pkthdr.pf.qid = r->pqid;
6486 m->m_pkthdr.pf.qid = r->qid;
6487 m->m_pkthdr.pf.ecn_af = AF_INET6;
6488 m->m_pkthdr.pf.hdr = h;
6491 m->m_pkthdr.pf.state_hash = s->hash;
6492 m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED;
6497 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
6498 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
6499 (s->nat_rule.ptr->action == PF_RDR ||
6500 s->nat_rule.ptr->action == PF_BINAT) &&
6501 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6))
6502 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST;
6504 if (dir == PF_IN && action == PF_PASS && r->divert.port) {
6505 struct pf_divert *divert;
6507 if ((divert = pf_get_divert(m))) {
6508 m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED;
6509 divert->port = r->divert.port;
6510 divert->addr.ipv6 = r->divert.addr.v6;
6517 if (s != NULL && s->nat_rule.ptr != NULL &&
6518 s->nat_rule.ptr->log & PF_LOG_ALL)
6519 lr = s->nat_rule.ptr;
6522 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset,
6526 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6527 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;
6529 if (action == PF_PASS || r->action == PF_DROP) {
6530 dirndx = (dir == PF_OUT);
6531 r->packets[dirndx]++;
6532 r->bytes[dirndx] += pd.tot_len;
6534 a->packets[dirndx]++;
6535 a->bytes[dirndx] += pd.tot_len;
6538 if (s->nat_rule.ptr != NULL) {
6539 s->nat_rule.ptr->packets[dirndx]++;
6540 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6542 if (s->src_node != NULL) {
6543 s->src_node->packets[dirndx]++;
6544 s->src_node->bytes[dirndx] += pd.tot_len;
6546 if (s->nat_src_node != NULL) {
6547 s->nat_src_node->packets[dirndx]++;
6548 s->nat_src_node->bytes[dirndx] += pd.tot_len;
6550 dirndx = (dir == s->direction) ? 0 : 1;
6551 s->packets[dirndx]++;
6552 s->bytes[dirndx] += pd.tot_len;
6555 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6556 if (nr != NULL && r == &pf_default_rule)
6558 if (tr->src.addr.type == PF_ADDR_TABLE)
6559 pfr_update_stats(tr->src.addr.p.tbl,
6560 (s == NULL) ? pd.src :
6561 &s->key[(s->direction == PF_IN)]->addr[0],
6562 pd.af, pd.tot_len, dir == PF_OUT,
6563 r->action == PF_PASS, tr->src.neg);
6564 if (tr->dst.addr.type == PF_ADDR_TABLE)
6565 pfr_update_stats(tr->dst.addr.p.tbl,
6566 (s == NULL) ? pd.dst :
6567 &s->key[(s->direction == PF_IN)]->addr[1],
6568 pd.af, pd.tot_len, dir == PF_OUT,
6569 r->action == PF_PASS, tr->dst.neg);
6573 if (action == PF_SYNPROXY_DROP) {
6578 /* pf_route6 can free the mbuf causing *m0 to become NULL */
6579 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd);
6586 pf_check_congestion(struct ifqueue *ifq)