FreeBSD/Linux Kernel Cross Reference
sys/net/pf/pf.c
1 /* $OpenBSD: pf.c,v 1.614 2008/08/02 12:34:37 henning Exp $ */
2
3 /*
4 * Copyright (c) 2004 The DragonFly Project. All rights reserved.
5 *
6 * Copyright (c) 2001 Daniel Hartmeier
7 * Copyright (c) 2002 - 2008 Henning Brauer
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
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.
20 *
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.
33 *
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.
37 *
38 */
39
40 #include "opt_inet.h"
41 #include "opt_inet6.h"
42
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/malloc.h>
46 #include <sys/mbuf.h>
47 #include <sys/filio.h>
48 #include <sys/socket.h>
49 #include <sys/socketvar.h>
50 #include <sys/kernel.h>
51 #include <sys/time.h>
52 #include <sys/sysctl.h>
53 #include <sys/endian.h>
54 #include <sys/proc.h>
55 #include <sys/kthread.h>
56
57 #include <machine/inttypes.h>
58
59 #include <sys/md5.h>
60
61 #include <net/if.h>
62 #include <net/if_types.h>
63 #include <net/bpf.h>
64 #include <net/netisr2.h>
65 #include <net/route.h>
66
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>
82
83 #include <net/pf/pfvar.h>
84 #include <net/pf/if_pflog.h>
85
86 #include <net/pf/if_pfsync.h>
87
88 #ifdef INET6
89 #include <netinet/ip6.h>
90 #include <netinet/icmp6.h>
91 #include <netinet6/nd6.h>
92 #include <netinet6/ip6_var.h>
93 #include <netinet6/in6_pcb.h>
94 #endif /* INET6 */
95
96 #include <sys/in_cksum.h>
97 #include <sys/ucred.h>
98 #include <machine/limits.h>
99 #include <sys/msgport2.h>
100 #include <net/netmsg2.h>
101
102 extern int ip_optcopy(struct ip *, struct ip *);
103 extern int debug_pfugidhack;
104
105 struct lwkt_token pf_token = LWKT_TOKEN_INITIALIZER(pf_token);
106
107 #define DPFPRINTF(n, x) if (pf_status.debug >= (n)) kprintf x
108
109 /*
110 * Global variables
111 */
112
113 /* mask radix tree */
114 struct radix_node_head *pf_maskhead;
115
116 /* state tables */
117 struct pf_state_tree pf_statetbl;
118
119 struct pf_altqqueue pf_altqs[2];
120 struct pf_palist pf_pabuf;
121 struct pf_altqqueue *pf_altqs_active;
122 struct pf_altqqueue *pf_altqs_inactive;
123 struct pf_status pf_status;
124
125 u_int32_t ticket_altqs_active;
126 u_int32_t ticket_altqs_inactive;
127 int altqs_inactive_open;
128 u_int32_t ticket_pabuf;
129
130 MD5_CTX pf_tcp_secret_ctx;
131 u_char pf_tcp_secret[16];
132 int pf_tcp_secret_init;
133 int pf_tcp_iss_off;
134
135 struct pf_anchor_stackframe {
136 struct pf_ruleset *rs;
137 struct pf_rule *r;
138 struct pf_anchor_node *parent;
139 struct pf_anchor *child;
140 } pf_anchor_stack[64];
141
142 struct malloc_type *pf_src_tree_pl, *pf_rule_pl, *pf_pooladdr_pl;
143 struct malloc_type *pf_state_pl, *pf_state_key_pl, *pf_state_item_pl;
144 struct malloc_type *pf_altq_pl;
145
146 void pf_print_host(struct pf_addr *, u_int16_t, u_int8_t);
147
148 void pf_init_threshold(struct pf_threshold *, u_int32_t,
149 u_int32_t);
150 void pf_add_threshold(struct pf_threshold *);
151 int pf_check_threshold(struct pf_threshold *);
152
153 void pf_change_ap(struct pf_addr *, u_int16_t *,
154 u_int16_t *, u_int16_t *, struct pf_addr *,
155 u_int16_t, u_int8_t, sa_family_t);
156 int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *,
157 struct tcphdr *, struct pf_state_peer *);
158 #ifdef INET6
159 void pf_change_a6(struct pf_addr *, u_int16_t *,
160 struct pf_addr *, u_int8_t);
161 #endif /* INET6 */
162 void pf_change_icmp(struct pf_addr *, u_int16_t *,
163 struct pf_addr *, struct pf_addr *, u_int16_t,
164 u_int16_t *, u_int16_t *, u_int16_t *,
165 u_int16_t *, u_int8_t, sa_family_t);
166 void pf_send_tcp(const struct pf_rule *, sa_family_t,
167 const struct pf_addr *, const struct pf_addr *,
168 u_int16_t, u_int16_t, u_int32_t, u_int32_t,
169 u_int8_t, u_int16_t, u_int16_t, u_int8_t, int,
170 u_int16_t, struct ether_header *, struct ifnet *);
171 void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
172 sa_family_t, struct pf_rule *);
173 struct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *,
174 int, int, struct pfi_kif *,
175 struct pf_addr *, u_int16_t, struct pf_addr *,
176 u_int16_t, int);
177 struct pf_rule *pf_get_translation(struct pf_pdesc *, struct mbuf *,
178 int, int, struct pfi_kif *, struct pf_src_node **,
179 struct pf_state_key **, struct pf_state_key **,
180 struct pf_state_key **, struct pf_state_key **,
181 struct pf_addr *, struct pf_addr *,
182 u_int16_t, u_int16_t);
183 void pf_detach_state(struct pf_state *);
184 int pf_state_key_setup(struct pf_pdesc *, struct pf_rule *,
185 struct pf_state_key **, struct pf_state_key **,
186 struct pf_state_key **, struct pf_state_key **,
187 struct pf_addr *, struct pf_addr *,
188 u_int16_t, u_int16_t);
189 void pf_state_key_detach(struct pf_state *, int);
190 u_int32_t pf_tcp_iss(struct pf_pdesc *);
191 int pf_test_rule(struct pf_rule **, struct pf_state **,
192 int, struct pfi_kif *, struct mbuf *, int,
193 void *, struct pf_pdesc *, struct pf_rule **,
194 struct pf_ruleset **, struct ifqueue *, struct inpcb *);
195 static __inline int pf_create_state(struct pf_rule *, struct pf_rule *,
196 struct pf_rule *, struct pf_pdesc *,
197 struct pf_src_node *, struct pf_state_key *,
198 struct pf_state_key *, struct pf_state_key *,
199 struct pf_state_key *, struct mbuf *, int,
200 u_int16_t, u_int16_t, int *, struct pfi_kif *,
201 struct pf_state **, int, u_int16_t, u_int16_t,
202 int);
203 int pf_test_fragment(struct pf_rule **, int,
204 struct pfi_kif *, struct mbuf *, void *,
205 struct pf_pdesc *, struct pf_rule **,
206 struct pf_ruleset **);
207 int pf_tcp_track_full(struct pf_state_peer *,
208 struct pf_state_peer *, struct pf_state **,
209 struct pfi_kif *, struct mbuf *, int,
210 struct pf_pdesc *, u_short *, int *);
211 int pf_tcp_track_sloppy(struct pf_state_peer *,
212 struct pf_state_peer *, struct pf_state **,
213 struct pf_pdesc *, u_short *);
214 int pf_test_state_tcp(struct pf_state **, int,
215 struct pfi_kif *, struct mbuf *, int,
216 void *, struct pf_pdesc *, u_short *);
217 int pf_test_state_udp(struct pf_state **, int,
218 struct pfi_kif *, struct mbuf *, int,
219 void *, struct pf_pdesc *);
220 int pf_test_state_icmp(struct pf_state **, int,
221 struct pfi_kif *, struct mbuf *, int,
222 void *, struct pf_pdesc *, u_short *);
223 int pf_test_state_other(struct pf_state **, int,
224 struct pfi_kif *, struct mbuf *, struct pf_pdesc *);
225 void pf_step_into_anchor(int *, struct pf_ruleset **, int,
226 struct pf_rule **, struct pf_rule **, int *);
227 int pf_step_out_of_anchor(int *, struct pf_ruleset **,
228 int, struct pf_rule **, struct pf_rule **,
229 int *);
230 void pf_hash(struct pf_addr *, struct pf_addr *,
231 struct pf_poolhashkey *, sa_family_t);
232 int pf_map_addr(u_int8_t, struct pf_rule *,
233 struct pf_addr *, struct pf_addr *,
234 struct pf_addr *, struct pf_src_node **);
235 int pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *,
236 struct pf_addr *, struct pf_addr *, u_int16_t,
237 struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t,
238 struct pf_src_node **);
239 void pf_route(struct mbuf **, struct pf_rule *, int,
240 struct ifnet *, struct pf_state *,
241 struct pf_pdesc *);
242 void pf_route6(struct mbuf **, struct pf_rule *, int,
243 struct ifnet *, struct pf_state *,
244 struct pf_pdesc *);
245 u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t,
246 sa_family_t);
247 u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t,
248 sa_family_t);
249 u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t,
250 u_int16_t);
251 void pf_set_rt_ifp(struct pf_state *,
252 struct pf_addr *);
253 int pf_check_proto_cksum(struct mbuf *, int, int,
254 u_int8_t, sa_family_t);
255 struct pf_divert *pf_get_divert(struct mbuf *);
256 void pf_print_state_parts(struct pf_state *,
257 struct pf_state_key *, struct pf_state_key *);
258 int pf_addr_wrap_neq(struct pf_addr_wrap *,
259 struct pf_addr_wrap *);
260 struct pf_state *pf_find_state(struct pfi_kif *,
261 struct pf_state_key_cmp *, u_int, struct mbuf *);
262 int pf_src_connlimit(struct pf_state **);
263 int pf_check_congestion(struct ifqueue *);
264
265 extern int pf_end_threads;
266
267 struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = {
268 { &pf_state_pl, PFSTATE_HIWAT },
269 { &pf_src_tree_pl, PFSNODE_HIWAT },
270 { &pf_frent_pl, PFFRAG_FRENT_HIWAT },
271 { &pfr_ktable_pl, PFR_KTABLE_HIWAT },
272 { &pfr_kentry_pl, PFR_KENTRY_HIWAT }
273 };
274
275 #define STATE_LOOKUP(i, k, d, s, m) \
276 do { \
277 s = pf_find_state(i, k, d, m); \
278 if (s == NULL || (s)->timeout == PFTM_PURGE) \
279 return (PF_DROP); \
280 if (d == PF_OUT && \
281 (((s)->rule.ptr->rt == PF_ROUTETO && \
282 (s)->rule.ptr->direction == PF_OUT) || \
283 ((s)->rule.ptr->rt == PF_REPLYTO && \
284 (s)->rule.ptr->direction == PF_IN)) && \
285 (s)->rt_kif != NULL && \
286 (s)->rt_kif != i) \
287 return (PF_PASS); \
288 } while (0)
289
290 #define BOUND_IFACE(r, k) \
291 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : pfi_all
292
293 #define STATE_INC_COUNTERS(s) \
294 do { \
295 s->rule.ptr->states_cur++; \
296 s->rule.ptr->states_tot++; \
297 if (s->anchor.ptr != NULL) { \
298 s->anchor.ptr->states_cur++; \
299 s->anchor.ptr->states_tot++; \
300 } \
301 if (s->nat_rule.ptr != NULL) { \
302 s->nat_rule.ptr->states_cur++; \
303 s->nat_rule.ptr->states_tot++; \
304 } \
305 } while (0)
306
307 #define STATE_DEC_COUNTERS(s) \
308 do { \
309 if (s->nat_rule.ptr != NULL) \
310 s->nat_rule.ptr->states_cur--; \
311 if (s->anchor.ptr != NULL) \
312 s->anchor.ptr->states_cur--; \
313 s->rule.ptr->states_cur--; \
314 } while (0)
315
316 static MALLOC_DEFINE(M_PFSTATEPL, "pfstatepl", "pf state pool list");
317 static MALLOC_DEFINE(M_PFSRCTREEPL, "pfsrctpl", "pf source tree pool list");
318 static MALLOC_DEFINE(M_PFSTATEKEYPL, "pfstatekeypl", "pf state key pool list");
319 static MALLOC_DEFINE(M_PFSTATEITEMPL, "pfstateitempl", "pf state item pool list");
320
321 static __inline int pf_src_compare(struct pf_src_node *, struct pf_src_node *);
322 static __inline int pf_state_compare_key(struct pf_state_key *,
323 struct pf_state_key *);
324 static __inline int pf_state_compare_id(struct pf_state *,
325 struct pf_state *);
326
327 struct pf_src_tree tree_src_tracking;
328
329 struct pf_state_tree_id tree_id;
330 struct pf_state_queue state_list;
331
332 RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare);
333 RB_GENERATE(pf_state_tree, pf_state_key, entry, pf_state_compare_key);
334 RB_GENERATE(pf_state_tree_id, pf_state,
335 entry_id, pf_state_compare_id);
336
337 static __inline int
338 pf_src_compare(struct pf_src_node *a, struct pf_src_node *b)
339 {
340 int diff;
341
342 if (a->rule.ptr > b->rule.ptr)
343 return (1);
344 if (a->rule.ptr < b->rule.ptr)
345 return (-1);
346 if ((diff = a->af - b->af) != 0)
347 return (diff);
348 switch (a->af) {
349 #ifdef INET
350 case AF_INET:
351 if (a->addr.addr32[0] > b->addr.addr32[0])
352 return (1);
353 if (a->addr.addr32[0] < b->addr.addr32[0])
354 return (-1);
355 break;
356 #endif /* INET */
357 #ifdef INET6
358 case AF_INET6:
359 if (a->addr.addr32[3] > b->addr.addr32[3])
360 return (1);
361 if (a->addr.addr32[3] < b->addr.addr32[3])
362 return (-1);
363 if (a->addr.addr32[2] > b->addr.addr32[2])
364 return (1);
365 if (a->addr.addr32[2] < b->addr.addr32[2])
366 return (-1);
367 if (a->addr.addr32[1] > b->addr.addr32[1])
368 return (1);
369 if (a->addr.addr32[1] < b->addr.addr32[1])
370 return (-1);
371 if (a->addr.addr32[0] > b->addr.addr32[0])
372 return (1);
373 if (a->addr.addr32[0] < b->addr.addr32[0])
374 return (-1);
375 break;
376 #endif /* INET6 */
377 }
378 return (0);
379 }
380
381 u_int32_t
382 pf_state_hash(struct pf_state_key *sk)
383 {
384 u_int32_t hv = (u_int32_t)(((intptr_t)sk >> 6) ^ ((intptr_t)sk >> 15));
385 if (hv == 0) /* disallow 0 */
386 hv = 1;
387 return(hv);
388 }
389
390 #ifdef INET6
391 void
392 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
393 {
394 switch (af) {
395 #ifdef INET
396 case AF_INET:
397 dst->addr32[0] = src->addr32[0];
398 break;
399 #endif /* INET */
400 case AF_INET6:
401 dst->addr32[0] = src->addr32[0];
402 dst->addr32[1] = src->addr32[1];
403 dst->addr32[2] = src->addr32[2];
404 dst->addr32[3] = src->addr32[3];
405 break;
406 }
407 }
408 #endif /* INET6 */
409
410 void
411 pf_init_threshold(struct pf_threshold *threshold,
412 u_int32_t limit, u_int32_t seconds)
413 {
414 threshold->limit = limit * PF_THRESHOLD_MULT;
415 threshold->seconds = seconds;
416 threshold->count = 0;
417 threshold->last = time_second;
418 }
419
420 void
421 pf_add_threshold(struct pf_threshold *threshold)
422 {
423 u_int32_t t = time_second, diff = t - threshold->last;
424
425 if (diff >= threshold->seconds)
426 threshold->count = 0;
427 else
428 threshold->count -= threshold->count * diff /
429 threshold->seconds;
430 threshold->count += PF_THRESHOLD_MULT;
431 threshold->last = t;
432 }
433
434 int
435 pf_check_threshold(struct pf_threshold *threshold)
436 {
437 return (threshold->count > threshold->limit);
438 }
439
440 int
441 pf_src_connlimit(struct pf_state **state)
442 {
443 int bad = 0;
444
445 (*state)->src_node->conn++;
446 (*state)->src.tcp_est = 1;
447 pf_add_threshold(&(*state)->src_node->conn_rate);
448
449 if ((*state)->rule.ptr->max_src_conn &&
450 (*state)->rule.ptr->max_src_conn <
451 (*state)->src_node->conn) {
452 pf_status.lcounters[LCNT_SRCCONN]++;
453 bad++;
454 }
455
456 if ((*state)->rule.ptr->max_src_conn_rate.limit &&
457 pf_check_threshold(&(*state)->src_node->conn_rate)) {
458 pf_status.lcounters[LCNT_SRCCONNRATE]++;
459 bad++;
460 }
461
462 if (!bad)
463 return (0);
464
465 if ((*state)->rule.ptr->overload_tbl) {
466 struct pfr_addr p;
467 u_int32_t killed = 0;
468
469 pf_status.lcounters[LCNT_OVERLOAD_TABLE]++;
470 if (pf_status.debug >= PF_DEBUG_MISC) {
471 kprintf("pf_src_connlimit: blocking address ");
472 pf_print_host(&(*state)->src_node->addr, 0,
473 (*state)->key[PF_SK_WIRE]->af);
474 }
475
476 bzero(&p, sizeof(p));
477 p.pfra_af = (*state)->key[PF_SK_WIRE]->af;
478 switch ((*state)->key[PF_SK_WIRE]->af) {
479 #ifdef INET
480 case AF_INET:
481 p.pfra_net = 32;
482 p.pfra_ip4addr = (*state)->src_node->addr.v4;
483 break;
484 #endif /* INET */
485 #ifdef INET6
486 case AF_INET6:
487 p.pfra_net = 128;
488 p.pfra_ip6addr = (*state)->src_node->addr.v6;
489 break;
490 #endif /* INET6 */
491 }
492
493 pfr_insert_kentry((*state)->rule.ptr->overload_tbl,
494 &p, time_second);
495
496 /* kill existing states if that's required. */
497 if ((*state)->rule.ptr->flush) {
498 struct pf_state_key *sk;
499 struct pf_state *st;
500
501 pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++;
502 RB_FOREACH(st, pf_state_tree_id, &tree_id) {
503 sk = st->key[PF_SK_WIRE];
504 /*
505 * Kill states from this source. (Only those
506 * from the same rule if PF_FLUSH_GLOBAL is not
507 * set)
508 */
509 if (sk->af ==
510 (*state)->key[PF_SK_WIRE]->af &&
511 (((*state)->direction == PF_OUT &&
512 PF_AEQ(&(*state)->src_node->addr,
513 &sk->addr[0], sk->af)) ||
514 ((*state)->direction == PF_IN &&
515 PF_AEQ(&(*state)->src_node->addr,
516 &sk->addr[1], sk->af))) &&
517 ((*state)->rule.ptr->flush &
518 PF_FLUSH_GLOBAL ||
519 (*state)->rule.ptr == st->rule.ptr)) {
520 st->timeout = PFTM_PURGE;
521 st->src.state = st->dst.state =
522 TCPS_CLOSED;
523 killed++;
524 }
525 }
526 if (pf_status.debug >= PF_DEBUG_MISC)
527 kprintf(", %u states killed", killed);
528 }
529 if (pf_status.debug >= PF_DEBUG_MISC)
530 kprintf("\n");
531 }
532
533 /* kill this state */
534 (*state)->timeout = PFTM_PURGE;
535 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
536 return (1);
537 }
538
539 int
540 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
541 struct pf_addr *src, sa_family_t af)
542 {
543 struct pf_src_node k;
544
545 if (*sn == NULL) {
546 k.af = af;
547 PF_ACPY(&k.addr, src, af);
548 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
549 rule->rpool.opts & PF_POOL_STICKYADDR)
550 k.rule.ptr = rule;
551 else
552 k.rule.ptr = NULL;
553 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
554 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
555 }
556 if (*sn == NULL) {
557 if (!rule->max_src_nodes ||
558 rule->src_nodes < rule->max_src_nodes)
559 (*sn) = kmalloc(sizeof(struct pf_src_node), M_PFSRCTREEPL, M_NOWAIT|M_ZERO);
560 else
561 pf_status.lcounters[LCNT_SRCNODES]++;
562 if ((*sn) == NULL)
563 return (-1);
564
565 pf_init_threshold(&(*sn)->conn_rate,
566 rule->max_src_conn_rate.limit,
567 rule->max_src_conn_rate.seconds);
568
569 (*sn)->af = af;
570 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
571 rule->rpool.opts & PF_POOL_STICKYADDR)
572 (*sn)->rule.ptr = rule;
573 else
574 (*sn)->rule.ptr = NULL;
575 PF_ACPY(&(*sn)->addr, src, af);
576 if (RB_INSERT(pf_src_tree,
577 &tree_src_tracking, *sn) != NULL) {
578 if (pf_status.debug >= PF_DEBUG_MISC) {
579 kprintf("pf: src_tree insert failed: ");
580 pf_print_host(&(*sn)->addr, 0, af);
581 kprintf("\n");
582 }
583 kfree(*sn, M_PFSRCTREEPL);
584 return (-1);
585 }
586 (*sn)->creation = time_second;
587 (*sn)->ruletype = rule->action;
588 if ((*sn)->rule.ptr != NULL)
589 (*sn)->rule.ptr->src_nodes++;
590 pf_status.scounters[SCNT_SRC_NODE_INSERT]++;
591 pf_status.src_nodes++;
592 } else {
593 if (rule->max_src_states &&
594 (*sn)->states >= rule->max_src_states) {
595 pf_status.lcounters[LCNT_SRCSTATES]++;
596 return (-1);
597 }
598 }
599 return (0);
600 }
601
602 /* state table stuff */
603
604 static __inline int
605 pf_state_compare_key(struct pf_state_key *a, struct pf_state_key *b)
606 {
607 int diff;
608
609 if ((diff = a->proto - b->proto) != 0)
610 return (diff);
611 if ((diff = a->af - b->af) != 0)
612 return (diff);
613 switch (a->af) {
614 #ifdef INET
615 case AF_INET:
616 if (a->addr[0].addr32[0] > b->addr[0].addr32[0])
617 return (1);
618 if (a->addr[0].addr32[0] < b->addr[0].addr32[0])
619 return (-1);
620 if (a->addr[1].addr32[0] > b->addr[1].addr32[0])
621 return (1);
622 if (a->addr[1].addr32[0] < b->addr[1].addr32[0])
623 return (-1);
624 break;
625 #endif /* INET */
626 #ifdef INET6
627 case AF_INET6:
628 if (a->addr[0].addr32[3] > b->addr[0].addr32[3])
629 return (1);
630 if (a->addr[0].addr32[3] < b->addr[0].addr32[3])
631 return (-1);
632 if (a->addr[1].addr32[3] > b->addr[1].addr32[3])
633 return (1);
634 if (a->addr[1].addr32[3] < b->addr[1].addr32[3])
635 return (-1);
636 if (a->addr[0].addr32[2] > b->addr[0].addr32[2])
637 return (1);
638 if (a->addr[0].addr32[2] < b->addr[0].addr32[2])
639 return (-1);
640 if (a->addr[1].addr32[2] > b->addr[1].addr32[2])
641 return (1);
642 if (a->addr[1].addr32[2] < b->addr[1].addr32[2])
643 return (-1);
644 if (a->addr[0].addr32[1] > b->addr[0].addr32[1])
645 return (1);
646 if (a->addr[0].addr32[1] < b->addr[0].addr32[1])
647 return (-1);
648 if (a->addr[1].addr32[1] > b->addr[1].addr32[1])
649 return (1);
650 if (a->addr[1].addr32[1] < b->addr[1].addr32[1])
651 return (-1);
652 if (a->addr[0].addr32[0] > b->addr[0].addr32[0])
653 return (1);
654 if (a->addr[0].addr32[0] < b->addr[0].addr32[0])
655 return (-1);
656 if (a->addr[1].addr32[0] > b->addr[1].addr32[0])
657 return (1);
658 if (a->addr[1].addr32[0] < b->addr[1].addr32[0])
659 return (-1);
660 break;
661 #endif /* INET6 */
662 }
663
664 if ((diff = a->port[0] - b->port[0]) != 0)
665 return (diff);
666 if ((diff = a->port[1] - b->port[1]) != 0)
667 return (diff);
668
669 return (0);
670 }
671
672 static __inline int
673 pf_state_compare_id(struct pf_state *a, struct pf_state *b)
674 {
675 if (a->id > b->id)
676 return (1);
677 if (a->id < b->id)
678 return (-1);
679 if (a->creatorid > b->creatorid)
680 return (1);
681 if (a->creatorid < b->creatorid)
682 return (-1);
683
684 return (0);
685 }
686
687 int
688 pf_state_key_attach(struct pf_state_key *sk, struct pf_state *s, int idx)
689 {
690 struct pf_state_item *si;
691 struct pf_state_key *cur;
692
693 KKASSERT(s->key[idx] == NULL); /* XXX handle this? */
694
695 if ((cur = RB_INSERT(pf_state_tree, &pf_statetbl, sk)) != NULL) {
696 /* key exists. check for same kif, if none, add to key */
697 TAILQ_FOREACH(si, &cur->states, entry)
698 if (si->s->kif == s->kif &&
699 si->s->direction == s->direction) {
700 if (pf_status.debug >= PF_DEBUG_MISC) {
701 kprintf(
702 "pf: %s key attach failed on %s: ",
703 (idx == PF_SK_WIRE) ?
704 "wire" : "stack",
705 s->kif->pfik_name);
706 pf_print_state_parts(s,
707 (idx == PF_SK_WIRE) ? sk : NULL,
708 (idx == PF_SK_STACK) ? sk : NULL);
709 kprintf("\n");
710 }
711 kfree(sk, M_PFSTATEKEYPL);
712 return (-1); /* collision! */
713 }
714 kfree(sk, M_PFSTATEKEYPL);
715
716 s->key[idx] = cur;
717 } else
718 s->key[idx] = sk;
719
720 if ((si = kmalloc(sizeof(struct pf_state_item), M_PFSTATEITEMPL, M_NOWAIT)) == NULL) {
721 pf_state_key_detach(s, idx);
722 return (-1);
723 }
724 si->s = s;
725
726 /* list is sorted, if-bound states before floating */
727 if (s->kif == pfi_all)
728 TAILQ_INSERT_TAIL(&s->key[idx]->states, si, entry);
729 else
730 TAILQ_INSERT_HEAD(&s->key[idx]->states, si, entry);
731 return (0);
732 }
733
734 void
735 pf_detach_state(struct pf_state *s)
736 {
737 if (s->key[PF_SK_WIRE] == s->key[PF_SK_STACK])
738 s->key[PF_SK_WIRE] = NULL;
739
740 if (s->key[PF_SK_STACK] != NULL)
741 pf_state_key_detach(s, PF_SK_STACK);
742
743 if (s->key[PF_SK_WIRE] != NULL)
744 pf_state_key_detach(s, PF_SK_WIRE);
745 }
746
747 void
748 pf_state_key_detach(struct pf_state *s, int idx)
749 {
750 struct pf_state_item *si;
751 si = TAILQ_FIRST(&s->key[idx]->states);
752 while (si && si->s != s)
753 si = TAILQ_NEXT(si, entry);
754
755 if (si) {
756 TAILQ_REMOVE(&s->key[idx]->states, si, entry);
757 kfree(si, M_PFSTATEITEMPL);
758 }
759
760 if (TAILQ_EMPTY(&s->key[idx]->states)) {
761 RB_REMOVE(pf_state_tree, &pf_statetbl, s->key[idx]);
762 if (s->key[idx]->reverse)
763 s->key[idx]->reverse->reverse = NULL;
764 if (s->key[idx]->inp)
765 s->key[idx]->inp->inp_pf_sk = NULL;
766 kfree(s->key[idx], M_PFSTATEKEYPL);
767 }
768 s->key[idx] = NULL;
769 }
770
771 struct pf_state_key *
772 pf_alloc_state_key(int pool_flags)
773 {
774 struct pf_state_key *sk;
775
776 if ((sk = kmalloc(sizeof(struct pf_state_key), M_PFSTATEKEYPL, pool_flags)) == NULL)
777 return (NULL);
778 TAILQ_INIT(&sk->states);
779
780 return (sk);
781 }
782
783 int
784 pf_state_key_setup(struct pf_pdesc *pd, struct pf_rule *nr,
785 struct pf_state_key **skw, struct pf_state_key **sks,
786 struct pf_state_key **skp, struct pf_state_key **nkp,
787 struct pf_addr *saddr, struct pf_addr *daddr,
788 u_int16_t sport, u_int16_t dport)
789 {
790 KKASSERT((*skp == NULL && *nkp == NULL));
791
792 if ((*skp = pf_alloc_state_key(M_NOWAIT | M_ZERO)) == NULL)
793 return (ENOMEM);
794
795 PF_ACPY(&(*skp)->addr[pd->sidx], saddr, pd->af);
796 PF_ACPY(&(*skp)->addr[pd->didx], daddr, pd->af);
797 (*skp)->port[pd->sidx] = sport;
798 (*skp)->port[pd->didx] = dport;
799 (*skp)->proto = pd->proto;
800 (*skp)->af = pd->af;
801
802 if (nr != NULL) {
803 if ((*nkp = pf_alloc_state_key(M_NOWAIT | M_ZERO)) == NULL)
804 return (ENOMEM); /* caller must handle cleanup */
805
806 /* XXX maybe just bcopy and TAILQ_INIT(&(*nkp)->states) */
807 PF_ACPY(&(*nkp)->addr[0], &(*skp)->addr[0], pd->af);
808 PF_ACPY(&(*nkp)->addr[1], &(*skp)->addr[1], pd->af);
809 (*nkp)->port[0] = (*skp)->port[0];
810 (*nkp)->port[1] = (*skp)->port[1];
811 (*nkp)->proto = pd->proto;
812 (*nkp)->af = pd->af;
813 } else
814 *nkp = *skp;
815
816 if (pd->dir == PF_IN) {
817 *skw = *skp;
818 *sks = *nkp;
819 } else {
820 *sks = *skp;
821 *skw = *nkp;
822 }
823 return (0);
824 }
825
826
827 int
828 pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw,
829 struct pf_state_key *sks, struct pf_state *s)
830 {
831 s->kif = kif;
832
833 if (skw == sks) {
834 if (pf_state_key_attach(skw, s, PF_SK_WIRE))
835 return (-1);
836 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE];
837 } else {
838 if (pf_state_key_attach(skw, s, PF_SK_WIRE)) {
839 kfree(sks, M_PFSTATEKEYPL);
840 return (-1);
841 }
842 if (pf_state_key_attach(sks, s, PF_SK_STACK)) {
843 pf_state_key_detach(s, PF_SK_WIRE);
844 return (-1);
845 }
846 }
847
848 if (s->id == 0 && s->creatorid == 0) {
849 s->id = htobe64(pf_status.stateid++);
850 s->creatorid = pf_status.hostid;
851 }
852
853 /*
854 * Calculate hash code for altq
855 */
856 s->hash = crc32(s->key[PF_SK_WIRE], sizeof(*sks));
857
858 if (RB_INSERT(pf_state_tree_id, &tree_id, s) != NULL) {
859 if (pf_status.debug >= PF_DEBUG_MISC) {
860 kprintf("pf: state insert failed: "
861 "id: %016jx creatorid: %08x",
862 (uintmax_t)be64toh(s->id), ntohl(s->creatorid));
863 if (s->sync_flags & PFSTATE_FROMSYNC)
864 kprintf(" (from sync)");
865 kprintf("\n");
866 }
867 pf_detach_state(s);
868 return (-1);
869 }
870 TAILQ_INSERT_TAIL(&state_list, s, entry_list);
871 pf_status.fcounters[FCNT_STATE_INSERT]++;
872 pf_status.states++;
873 pfi_kif_ref(kif, PFI_KIF_REF_STATE);
874 pfsync_insert_state(s);
875 return (0);
876 }
877
878 struct pf_state *
879 pf_find_state_byid(struct pf_state_cmp *key)
880 {
881 pf_status.fcounters[FCNT_STATE_SEARCH]++;
882
883 return (RB_FIND(pf_state_tree_id, &tree_id, (struct pf_state *)key));
884 }
885
886 struct pf_state *
887 pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir,
888 struct mbuf *m)
889 {
890 struct pf_state_key *sk;
891 struct pf_state_item *si;
892
893 pf_status.fcounters[FCNT_STATE_SEARCH]++;
894
895 if (dir == PF_OUT && m->m_pkthdr.pf.statekey &&
896 ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse)
897 sk = ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse;
898 else {
899 if ((sk = RB_FIND(pf_state_tree, &pf_statetbl,
900 (struct pf_state_key *)key)) == NULL)
901 return (NULL);
902 if (dir == PF_OUT && m->m_pkthdr.pf.statekey) {
903 ((struct pf_state_key *)
904 m->m_pkthdr.pf.statekey)->reverse = sk;
905 sk->reverse = m->m_pkthdr.pf.statekey;
906 }
907 }
908
909 if (dir == PF_OUT)
910 m->m_pkthdr.pf.statekey = NULL;
911
912 /* list is sorted, if-bound states before floating ones */
913 TAILQ_FOREACH(si, &sk->states, entry)
914 if ((si->s->kif == pfi_all || si->s->kif == kif) &&
915 sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] :
916 si->s->key[PF_SK_STACK]))
917 return (si->s);
918
919 return (NULL);
920 }
921
922 struct pf_state *
923 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more)
924 {
925 struct pf_state_key *sk;
926 struct pf_state_item *si, *ret = NULL;
927
928 pf_status.fcounters[FCNT_STATE_SEARCH]++;
929
930 sk = RB_FIND(pf_state_tree, &pf_statetbl, (struct pf_state_key *)key);
931
932 if (sk != NULL) {
933 TAILQ_FOREACH(si, &sk->states, entry)
934 if (dir == PF_INOUT ||
935 (sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] :
936 si->s->key[PF_SK_STACK]))) {
937 if (more == NULL)
938 return (si->s);
939
940 if (ret)
941 (*more)++;
942 else
943 ret = si;
944 }
945 }
946 return (ret ? ret->s : NULL);
947 }
948
949 /* END state table stuff */
950
951
952 void
953 pf_purge_thread(void *v)
954 {
955 int nloops = 0;
956 int locked = 0;
957
958 lwkt_gettoken(&pf_token);
959 for (;;) {
960 tsleep(pf_purge_thread, PWAIT, "pftm", 1 * hz);
961
962 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
963
964 if (pf_end_threads) {
965 pf_purge_expired_states(pf_status.states, 0);
966 pf_purge_expired_fragments();
967 pf_purge_expired_src_nodes(1);
968 pf_end_threads++;
969
970 lockmgr(&pf_consistency_lock, LK_RELEASE);
971 wakeup(pf_purge_thread);
972 kthread_exit();
973 }
974 crit_enter();
975
976 /* process a fraction of the state table every second */
977 if(!pf_purge_expired_states(1 + (pf_status.states
978 / pf_default_rule.timeout[PFTM_INTERVAL]), 0)) {
979
980 pf_purge_expired_states(1 + (pf_status.states
981 / pf_default_rule.timeout[PFTM_INTERVAL]), 1);
982 }
983
984 /* purge other expired types every PFTM_INTERVAL seconds */
985 if (++nloops >= pf_default_rule.timeout[PFTM_INTERVAL]) {
986 pf_purge_expired_fragments();
987 if (!pf_purge_expired_src_nodes(locked)) {
988 pf_purge_expired_src_nodes(1);
989 }
990 nloops = 0;
991 }
992 crit_exit();
993 lockmgr(&pf_consistency_lock, LK_RELEASE);
994 }
995 lwkt_reltoken(&pf_token);
996 }
997
998 u_int32_t
999 pf_state_expires(const struct pf_state *state)
1000 {
1001 u_int32_t timeout;
1002 u_int32_t start;
1003 u_int32_t end;
1004 u_int32_t states;
1005
1006 /* handle all PFTM_* > PFTM_MAX here */
1007 if (state->timeout == PFTM_PURGE)
1008 return (time_second);
1009 if (state->timeout == PFTM_UNTIL_PACKET)
1010 return (0);
1011 KKASSERT(state->timeout != PFTM_UNLINKED);
1012 KKASSERT(state->timeout < PFTM_MAX);
1013 timeout = state->rule.ptr->timeout[state->timeout];
1014 if (!timeout)
1015 timeout = pf_default_rule.timeout[state->timeout];
1016 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
1017 if (start) {
1018 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
1019 states = state->rule.ptr->states_cur;
1020 } else {
1021 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START];
1022 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END];
1023 states = pf_status.states;
1024 }
1025 if (end && states > start && start < end) {
1026 if (states < end)
1027 return (state->expire + timeout * (end - states) /
1028 (end - start));
1029 else
1030 return (time_second);
1031 }
1032 return (state->expire + timeout);
1033 }
1034
1035 int
1036 pf_purge_expired_src_nodes(int waslocked)
1037 {
1038 struct pf_src_node *cur, *next;
1039 int locked = waslocked;
1040
1041 for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) {
1042 next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur);
1043
1044 if (cur->states <= 0 && cur->expire <= time_second) {
1045 if (! locked) {
1046 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
1047 next = RB_NEXT(pf_src_tree,
1048 &tree_src_tracking, cur);
1049 locked = 1;
1050 }
1051 if (cur->rule.ptr != NULL) {
1052 cur->rule.ptr->src_nodes--;
1053 if (cur->rule.ptr->states_cur <= 0 &&
1054 cur->rule.ptr->max_src_nodes <= 0)
1055 pf_rm_rule(NULL, cur->rule.ptr);
1056 }
1057 RB_REMOVE(pf_src_tree, &tree_src_tracking, cur);
1058 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
1059 pf_status.src_nodes--;
1060 kfree(cur, M_PFSRCTREEPL);
1061 }
1062 }
1063
1064 if (locked && !waslocked)
1065 lockmgr(&pf_consistency_lock, LK_RELEASE);
1066 return(1);
1067 }
1068
1069 void
1070 pf_src_tree_remove_state(struct pf_state *s)
1071 {
1072 u_int32_t timeout;
1073
1074 if (s->src_node != NULL) {
1075 if (s->src.tcp_est)
1076 --s->src_node->conn;
1077 if (--s->src_node->states <= 0) {
1078 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
1079 if (!timeout)
1080 timeout =
1081 pf_default_rule.timeout[PFTM_SRC_NODE];
1082 s->src_node->expire = time_second + timeout;
1083 }
1084 }
1085 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
1086 if (--s->nat_src_node->states <= 0) {
1087 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
1088 if (!timeout)
1089 timeout =
1090 pf_default_rule.timeout[PFTM_SRC_NODE];
1091 s->nat_src_node->expire = time_second + timeout;
1092 }
1093 }
1094 s->src_node = s->nat_src_node = NULL;
1095 }
1096
1097 /* callers should be at crit_enter() */
1098 void
1099 pf_unlink_state(struct pf_state *cur)
1100 {
1101 if (cur->src.state == PF_TCPS_PROXY_DST) {
1102 /* XXX wire key the right one? */
1103 pf_send_tcp(cur->rule.ptr, cur->key[PF_SK_WIRE]->af,
1104 &cur->key[PF_SK_WIRE]->addr[1],
1105 &cur->key[PF_SK_WIRE]->addr[0],
1106 cur->key[PF_SK_WIRE]->port[1],
1107 cur->key[PF_SK_WIRE]->port[0],
1108 cur->src.seqhi, cur->src.seqlo + 1,
1109 TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL);
1110 }
1111 RB_REMOVE(pf_state_tree_id, &tree_id, cur);
1112 if (cur->creatorid == pf_status.hostid)
1113 pfsync_delete_state(cur);
1114 cur->timeout = PFTM_UNLINKED;
1115 pf_src_tree_remove_state(cur);
1116 pf_detach_state(cur);
1117 }
1118
1119 static struct pf_state *purge_cur;
1120
1121 /* callers should be at crit_enter() and hold the
1122 * write_lock on pf_consistency_lock */
1123 void
1124 pf_free_state(struct pf_state *cur)
1125 {
1126 if (pfsyncif != NULL &&
1127 (pfsyncif->sc_bulk_send_next == cur ||
1128 pfsyncif->sc_bulk_terminator == cur))
1129 return;
1130 KKASSERT(cur->timeout == PFTM_UNLINKED);
1131 if (--cur->rule.ptr->states_cur <= 0 &&
1132 cur->rule.ptr->src_nodes <= 0)
1133 pf_rm_rule(NULL, cur->rule.ptr);
1134 if (cur->nat_rule.ptr != NULL)
1135 if (--cur->nat_rule.ptr->states_cur <= 0 &&
1136 cur->nat_rule.ptr->src_nodes <= 0)
1137 pf_rm_rule(NULL, cur->nat_rule.ptr);
1138 if (cur->anchor.ptr != NULL)
1139 if (--cur->anchor.ptr->states_cur <= 0)
1140 pf_rm_rule(NULL, cur->anchor.ptr);
1141 pf_normalize_tcp_cleanup(cur);
1142 pfi_kif_unref(cur->kif, PFI_KIF_REF_STATE);
1143
1144 /*
1145 * We may be freeing pf_purge_expired_states()'s saved scan entry,
1146 * adjust it if necessary.
1147 */
1148 if (purge_cur == cur) {
1149 kprintf("PURGE CONFLICT\n");
1150 purge_cur = TAILQ_NEXT(purge_cur, entry_list);
1151 }
1152 TAILQ_REMOVE(&state_list, cur, entry_list);
1153 if (cur->tag)
1154 pf_tag_unref(cur->tag);
1155 kfree(cur, M_PFSTATEPL);
1156 pf_status.fcounters[FCNT_STATE_REMOVALS]++;
1157 pf_status.states--;
1158 }
1159
1160 int
1161 pf_purge_expired_states(u_int32_t maxcheck, int waslocked)
1162 {
1163 struct pf_state *cur;
1164 int locked = waslocked;
1165
1166 while (maxcheck--) {
1167 /*
1168 * Wrap to start of list when we hit the end
1169 */
1170 cur = purge_cur;
1171 if (cur == NULL) {
1172 cur = TAILQ_FIRST(&state_list);
1173 if (cur == NULL)
1174 break; /* list empty */
1175 }
1176
1177 /*
1178 * Setup next (purge_cur) while we process this one. If we block and
1179 * something else deletes purge_cur, pf_free_state() will adjust it further
1180 * ahead.
1181 */
1182 purge_cur = TAILQ_NEXT(cur, entry_list);
1183
1184 if (cur->timeout == PFTM_UNLINKED) {
1185 /* free unlinked state */
1186 if (! locked) {
1187 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
1188 locked = 1;
1189 }
1190 pf_free_state(cur);
1191 } else if (pf_state_expires(cur) <= time_second) {
1192 /* unlink and free expired state */
1193 pf_unlink_state(cur);
1194 if (! locked) {
1195 if (!lockmgr(&pf_consistency_lock, LK_EXCLUSIVE))
1196 return (0);
1197 locked = 1;
1198 }
1199 pf_free_state(cur);
1200 }
1201 }
1202
1203 if (locked)
1204 lockmgr(&pf_consistency_lock, LK_RELEASE);
1205 return (1);
1206 }
1207
1208 int
1209 pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw)
1210 {
1211 if (aw->type != PF_ADDR_TABLE)
1212 return (0);
1213 if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL)
1214 return (1);
1215 return (0);
1216 }
1217
1218 void
1219 pf_tbladdr_remove(struct pf_addr_wrap *aw)
1220 {
1221 if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL)
1222 return;
1223 pfr_detach_table(aw->p.tbl);
1224 aw->p.tbl = NULL;
1225 }
1226
1227 void
1228 pf_tbladdr_copyout(struct pf_addr_wrap *aw)
1229 {
1230 struct pfr_ktable *kt = aw->p.tbl;
1231
1232 if (aw->type != PF_ADDR_TABLE || kt == NULL)
1233 return;
1234 if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL)
1235 kt = kt->pfrkt_root;
1236 aw->p.tbl = NULL;
1237 aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ?
1238 kt->pfrkt_cnt : -1;
1239 }
1240
1241 void
1242 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
1243 {
1244 switch (af) {
1245 #ifdef INET
1246 case AF_INET: {
1247 u_int32_t a = ntohl(addr->addr32[0]);
1248 kprintf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
1249 (a>>8)&255, a&255);
1250 if (p) {
1251 p = ntohs(p);
1252 kprintf(":%u", p);
1253 }
1254 break;
1255 }
1256 #endif /* INET */
1257 #ifdef INET6
1258 case AF_INET6: {
1259 u_int16_t b;
1260 u_int8_t i, curstart = 255, curend = 0,
1261 maxstart = 0, maxend = 0;
1262 for (i = 0; i < 8; i++) {
1263 if (!addr->addr16[i]) {
1264 if (curstart == 255)
1265 curstart = i;
1266 else
1267 curend = i;
1268 } else {
1269 if (curstart) {
1270 if ((curend - curstart) >
1271 (maxend - maxstart)) {
1272 maxstart = curstart;
1273 maxend = curend;
1274 curstart = 255;
1275 }
1276 }
1277 }
1278 }
1279 for (i = 0; i < 8; i++) {
1280 if (i >= maxstart && i <= maxend) {
1281 if (maxend != 7) {
1282 if (i == maxstart)
1283 kprintf(":");
1284 } else {
1285 if (i == maxend)
1286 kprintf(":");
1287 }
1288 } else {
1289 b = ntohs(addr->addr16[i]);
1290 kprintf("%x", b);
1291 if (i < 7)
1292 kprintf(":");
1293 }
1294 }
1295 if (p) {
1296 p = ntohs(p);
1297 kprintf("[%u]", p);
1298 }
1299 break;
1300 }
1301 #endif /* INET6 */
1302 }
1303 }
1304
1305 void
1306 pf_print_state(struct pf_state *s)
1307 {
1308 pf_print_state_parts(s, NULL, NULL);
1309 }
1310
1311 void
1312 pf_print_state_parts(struct pf_state *s,
1313 struct pf_state_key *skwp, struct pf_state_key *sksp)
1314 {
1315 struct pf_state_key *skw, *sks;
1316 u_int8_t proto, dir;
1317
1318 /* Do our best to fill these, but they're skipped if NULL */
1319 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL);
1320 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL);
1321 proto = skw ? skw->proto : (sks ? sks->proto : 0);
1322 dir = s ? s->direction : 0;
1323
1324 switch (proto) {
1325 case IPPROTO_TCP:
1326 kprintf("TCP ");
1327 break;
1328 case IPPROTO_UDP:
1329 kprintf("UDP ");
1330 break;
1331 case IPPROTO_ICMP:
1332 kprintf("ICMP ");
1333 break;
1334 case IPPROTO_ICMPV6:
1335 kprintf("ICMPV6 ");
1336 break;
1337 default:
1338 kprintf("%u ", skw->proto);
1339 break;
1340 }
1341 switch (dir) {
1342 case PF_IN:
1343 kprintf(" in");
1344 break;
1345 case PF_OUT:
1346 kprintf(" out");
1347 break;
1348 }
1349 if (skw) {
1350 kprintf(" wire: ");
1351 pf_print_host(&skw->addr[0], skw->port[0], skw->af);
1352 kprintf(" ");
1353 pf_print_host(&skw->addr[1], skw->port[1], skw->af);
1354 }
1355 if (sks) {
1356 kprintf(" stack: ");
1357 if (sks != skw) {
1358 pf_print_host(&sks->addr[0], sks->port[0], sks->af);
1359 kprintf(" ");
1360 pf_print_host(&sks->addr[1], sks->port[1], sks->af);
1361 } else
1362 kprintf("-");
1363 }
1364 if (s) {
1365 if (proto == IPPROTO_TCP) {
1366 kprintf(" [lo=%u high=%u win=%u modulator=%u",
1367 s->src.seqlo, s->src.seqhi,
1368 s->src.max_win, s->src.seqdiff);
1369 if (s->src.wscale && s->dst.wscale)
1370 kprintf(" wscale=%u",
1371 s->src.wscale & PF_WSCALE_MASK);
1372 kprintf("]");
1373 kprintf(" [lo=%u high=%u win=%u modulator=%u",
1374 s->dst.seqlo, s->dst.seqhi,
1375 s->dst.max_win, s->dst.seqdiff);
1376 if (s->src.wscale && s->dst.wscale)
1377 kprintf(" wscale=%u",
1378 s->dst.wscale & PF_WSCALE_MASK);
1379 kprintf("]");
1380 }
1381 kprintf(" %u:%u", s->src.state, s->dst.state);
1382 }
1383 }
1384
1385 void
1386 pf_print_flags(u_int8_t f)
1387 {
1388 if (f)
1389 kprintf(" ");
1390 if (f & TH_FIN)
1391 kprintf("F");
1392 if (f & TH_SYN)
1393 kprintf("S");
1394 if (f & TH_RST)
1395 kprintf("R");
1396 if (f & TH_PUSH)
1397 kprintf("P");
1398 if (f & TH_ACK)
1399 kprintf("A");
1400 if (f & TH_URG)
1401 kprintf("U");
1402 if (f & TH_ECE)
1403 kprintf("E");
1404 if (f & TH_CWR)
1405 kprintf("W");
1406 }
1407
1408 #define PF_SET_SKIP_STEPS(i) \
1409 do { \
1410 while (head[i] != cur) { \
1411 head[i]->skip[i].ptr = cur; \
1412 head[i] = TAILQ_NEXT(head[i], entries); \
1413 } \
1414 } while (0)
1415
1416 void
1417 pf_calc_skip_steps(struct pf_rulequeue *rules)
1418 {
1419 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
1420 int i;
1421
1422 cur = TAILQ_FIRST(rules);
1423 prev = cur;
1424 for (i = 0; i < PF_SKIP_COUNT; ++i)
1425 head[i] = cur;
1426 while (cur != NULL) {
1427
1428 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
1429 PF_SET_SKIP_STEPS(PF_SKIP_IFP);
1430 if (cur->direction != prev->direction)
1431 PF_SET_SKIP_STEPS(PF_SKIP_DIR);
1432 if (cur->af != prev->af)
1433 PF_SET_SKIP_STEPS(PF_SKIP_AF);
1434 if (cur->proto != prev->proto)
1435 PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
1436 if (cur->src.neg != prev->src.neg ||
1437 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
1438 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
1439 if (cur->src.port[0] != prev->src.port[0] ||
1440 cur->src.port[1] != prev->src.port[1] ||
1441 cur->src.port_op != prev->src.port_op)
1442 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
1443 if (cur->dst.neg != prev->dst.neg ||
1444 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
1445 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
1446 if (cur->dst.port[0] != prev->dst.port[0] ||
1447 cur->dst.port[1] != prev->dst.port[1] ||
1448 cur->dst.port_op != prev->dst.port_op)
1449 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
1450
1451 prev = cur;
1452 cur = TAILQ_NEXT(cur, entries);
1453 }
1454 for (i = 0; i < PF_SKIP_COUNT; ++i)
1455 PF_SET_SKIP_STEPS(i);
1456 }
1457
1458 int
1459 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
1460 {
1461 if (aw1->type != aw2->type)
1462 return (1);
1463 switch (aw1->type) {
1464 case PF_ADDR_ADDRMASK:
1465 case PF_ADDR_RANGE:
1466 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0))
1467 return (1);
1468 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0))
1469 return (1);
1470 return (0);
1471 case PF_ADDR_DYNIFTL:
1472 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
1473 case PF_ADDR_NOROUTE:
1474 case PF_ADDR_URPFFAILED:
1475 return (0);
1476 case PF_ADDR_TABLE:
1477 return (aw1->p.tbl != aw2->p.tbl);
1478 case PF_ADDR_RTLABEL:
1479 return (aw1->v.rtlabel != aw2->v.rtlabel);
1480 default:
1481 kprintf("invalid address type: %d\n", aw1->type);
1482 return (1);
1483 }
1484 }
1485
1486 u_int16_t
1487 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
1488 {
1489 u_int32_t l;
1490
1491 if (udp && !cksum)
1492 return (0x0000);
1493 l = cksum + old - new;
1494 l = (l >> 16) + (l & 65535);
1495 l = l & 65535;
1496 if (udp && !l)
1497 return (0xFFFF);
1498 return (l);
1499 }
1500
1501 void
1502 pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc,
1503 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af)
1504 {
1505 struct pf_addr ao;
1506 u_int16_t po = *p;
1507
1508 PF_ACPY(&ao, a, af);
1509 PF_ACPY(a, an, af);
1510
1511 *p = pn;
1512
1513 switch (af) {
1514 #ifdef INET
1515 case AF_INET:
1516 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1517 ao.addr16[0], an->addr16[0], 0),
1518 ao.addr16[1], an->addr16[1], 0);
1519 *p = pn;
1520 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1521 ao.addr16[0], an->addr16[0], u),
1522 ao.addr16[1], an->addr16[1], u),
1523 po, pn, u);
1524 break;
1525 #endif /* INET */
1526 #ifdef INET6
1527 case AF_INET6:
1528 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1529 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1530 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1531 ao.addr16[0], an->addr16[0], u),
1532 ao.addr16[1], an->addr16[1], u),
1533 ao.addr16[2], an->addr16[2], u),
1534 ao.addr16[3], an->addr16[3], u),
1535 ao.addr16[4], an->addr16[4], u),
1536 ao.addr16[5], an->addr16[5], u),
1537 ao.addr16[6], an->addr16[6], u),
1538 ao.addr16[7], an->addr16[7], u),
1539 po, pn, u);
1540 break;
1541 #endif /* INET6 */
1542 }
1543 }
1544
1545
1546 /* Changes a u_int32_t. Uses a void * so there are no align restrictions */
1547 void
1548 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
1549 {
1550 u_int32_t ao;
1551
1552 memcpy(&ao, a, sizeof(ao));
1553 memcpy(a, &an, sizeof(u_int32_t));
1554 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
1555 ao % 65536, an % 65536, u);
1556 }
1557
1558 #ifdef INET6
1559 void
1560 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
1561 {
1562 struct pf_addr ao;
1563
1564 PF_ACPY(&ao, a, AF_INET6);
1565 PF_ACPY(a, an, AF_INET6);
1566
1567 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1568 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1569 pf_cksum_fixup(pf_cksum_fixup(*c,
1570 ao.addr16[0], an->addr16[0], u),
1571 ao.addr16[1], an->addr16[1], u),
1572 ao.addr16[2], an->addr16[2], u),
1573 ao.addr16[3], an->addr16[3], u),
1574 ao.addr16[4], an->addr16[4], u),
1575 ao.addr16[5], an->addr16[5], u),
1576 ao.addr16[6], an->addr16[6], u),
1577 ao.addr16[7], an->addr16[7], u);
1578 }
1579 #endif /* INET6 */
1580
1581 void
1582 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
1583 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
1584 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
1585 {
1586 struct pf_addr oia, ooa;
1587
1588 PF_ACPY(&oia, ia, af);
1589 if (oa)
1590 PF_ACPY(&ooa, oa, af);
1591
1592 /* Change inner protocol port, fix inner protocol checksum. */
1593 if (ip != NULL) {
1594 u_int16_t oip = *ip;
1595 u_int32_t opc = 0;
1596
1597 if (pc != NULL)
1598 opc = *pc;
1599 *ip = np;
1600 if (pc != NULL)
1601 *pc = pf_cksum_fixup(*pc, oip, *ip, u);
1602 *ic = pf_cksum_fixup(*ic, oip, *ip, 0);
1603 if (pc != NULL)
1604 *ic = pf_cksum_fixup(*ic, opc, *pc, 0);
1605 }
1606 /* Change inner ip address, fix inner ip and icmp checksums. */
1607 PF_ACPY(ia, na, af);
1608 switch (af) {
1609 #ifdef INET
1610 case AF_INET: {
1611 u_int32_t oh2c = *h2c;
1612
1613 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
1614 oia.addr16[0], ia->addr16[0], 0),
1615 oia.addr16[1], ia->addr16[1], 0);
1616 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1617 oia.addr16[0], ia->addr16[0], 0),
1618 oia.addr16[1], ia->addr16[1], 0);
1619 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
1620 break;
1621 }
1622 #endif /* INET */
1623 #ifdef INET6
1624 case AF_INET6:
1625 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1626 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1627 pf_cksum_fixup(pf_cksum_fixup(*ic,
1628 oia.addr16[0], ia->addr16[0], u),
1629 oia.addr16[1], ia->addr16[1], u),
1630 oia.addr16[2], ia->addr16[2], u),
1631 oia.addr16[3], ia->addr16[3], u),
1632 oia.addr16[4], ia->addr16[4], u),
1633 oia.addr16[5], ia->addr16[5], u),
1634 oia.addr16[6], ia->addr16[6], u),
1635 oia.addr16[7], ia->addr16[7], u);
1636 break;
1637 #endif /* INET6 */
1638 }
1639 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */
1640 if (oa) {
1641 PF_ACPY(oa, na, af);
1642 switch (af) {
1643 #ifdef INET
1644 case AF_INET:
1645 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
1646 ooa.addr16[0], oa->addr16[0], 0),
1647 ooa.addr16[1], oa->addr16[1], 0);
1648 break;
1649 #endif /* INET */
1650 #ifdef INET6
1651 case AF_INET6:
1652 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1653 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1654 pf_cksum_fixup(pf_cksum_fixup(*ic,
1655 ooa.addr16[0], oa->addr16[0], u),
1656 ooa.addr16[1], oa->addr16[1], u),
1657 ooa.addr16[2], oa->addr16[2], u),
1658 ooa.addr16[3], oa->addr16[3], u),
1659 ooa.addr16[4], oa->addr16[4], u),
1660 ooa.addr16[5], oa->addr16[5], u),
1661 ooa.addr16[6], oa->addr16[6], u),
1662 ooa.addr16[7], oa->addr16[7], u);
1663 break;
1664 #endif /* INET6 */
1665 }
1666 }
1667 }
1668
1669
1670 /*
1671 * Need to modulate the sequence numbers in the TCP SACK option
1672 * (credits to Krzysztof Pfaff for report and patch)
1673 */
1674 int
1675 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd,
1676 struct tcphdr *th, struct pf_state_peer *dst)
1677 {
1678 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen;
1679 u_int8_t opts[TCP_MAXOLEN], *opt = opts;
1680 int copyback = 0, i, olen;
1681 struct raw_sackblock sack;
1682
1683 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2)
1684 if (hlen < TCPOLEN_SACKLEN ||
1685 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af))
1686 return 0;
1687
1688 while (hlen >= TCPOLEN_SACKLEN) {
1689 olen = opt[1];
1690 switch (*opt) {
1691 case TCPOPT_EOL: /* FALLTHROUGH */
1692 case TCPOPT_NOP:
1693 opt++;
1694 hlen--;
1695 break;
1696 case TCPOPT_SACK:
1697 if (olen > hlen)
1698 olen = hlen;
1699 if (olen >= TCPOLEN_SACKLEN) {
1700 for (i = 2; i + TCPOLEN_SACK <= olen;
1701 i += TCPOLEN_SACK) {
1702 memcpy(&sack, &opt[i], sizeof(sack));
1703 pf_change_a(&sack.rblk_start, &th->th_sum,
1704 htonl(ntohl(sack.rblk_start) -
1705 dst->seqdiff), 0);
1706 pf_change_a(&sack.rblk_end, &th->th_sum,
1707 htonl(ntohl(sack.rblk_end) -
1708 dst->seqdiff), 0);
1709 memcpy(&opt[i], &sack, sizeof(sack));
1710 }
1711 copyback = 1;
1712 }
1713 /* FALLTHROUGH */
1714 default:
1715 if (olen < 2)
1716 olen = 2;
1717 hlen -= olen;
1718 opt += olen;
1719 }
1720 }
1721
1722 if (copyback)
1723 m_copyback(m, off + sizeof(*th), thoptlen, opts);
1724 return (copyback);
1725 }
1726
1727 void
1728 pf_send_tcp(const struct pf_rule *r, sa_family_t af,
1729 const struct pf_addr *saddr, const struct pf_addr *daddr,
1730 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
1731 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag,
1732 u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp)
1733 {
1734 struct mbuf *m;
1735 int len = 0, tlen;
1736 #ifdef INET
1737 struct ip *h = NULL;
1738 #endif /* INET */
1739 #ifdef INET6
1740 struct ip6_hdr *h6 = NULL;
1741 #endif /* INET6 */
1742 struct tcphdr *th = NULL;
1743 char *opt;
1744
1745 ASSERT_LWKT_TOKEN_HELD(&pf_token);
1746
1747 /* maximum segment size tcp option */
1748 tlen = sizeof(struct tcphdr);
1749 if (mss)
1750 tlen += 4;
1751
1752 switch (af) {
1753 #ifdef INET
1754 case AF_INET:
1755 len = sizeof(struct ip) + tlen;
1756 break;
1757 #endif /* INET */
1758 #ifdef INET6
1759 case AF_INET6:
1760 len = sizeof(struct ip6_hdr) + tlen;
1761 break;
1762 #endif /* INET6 */
1763 }
1764
1765 /*
1766 * Create outgoing mbuf.
1767 *
1768 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
1769 * so make sure pf.flags is clear.
1770 */
1771 m = m_gethdr(MB_DONTWAIT, MT_HEADER);
1772 if (m == NULL) {
1773 return;
1774 }
1775 if (tag)
1776 m->m_pkthdr.fw_flags |= PF_MBUF_TAGGED;
1777 m->m_pkthdr.pf.flags = 0;
1778 m->m_pkthdr.pf.tag = rtag;
1779 /* XXX Recheck when upgrading to > 4.4 */
1780 m->m_pkthdr.pf.statekey = NULL;
1781 if (r != NULL && r->rtableid >= 0)
1782 m->m_pkthdr.pf.rtableid = r->rtableid;
1783
1784 #ifdef ALTQ
1785 if (r != NULL && r->qid) {
1786 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
1787 m->m_pkthdr.pf.qid = r->qid;
1788 m->m_pkthdr.pf.ecn_af = af;
1789 m->m_pkthdr.pf.hdr = mtod(m, struct ip *);
1790 }
1791 #endif /* ALTQ */
1792 m->m_data += max_linkhdr;
1793 m->m_pkthdr.len = m->m_len = len;
1794 m->m_pkthdr.rcvif = NULL;
1795 bzero(m->m_data, len);
1796 switch (af) {
1797 #ifdef INET
1798 case AF_INET:
1799 h = mtod(m, struct ip *);
1800
1801 /* IP header fields included in the TCP checksum */
1802 h->ip_p = IPPROTO_TCP;
1803 h->ip_len = tlen;
1804 h->ip_src.s_addr = saddr->v4.s_addr;
1805 h->ip_dst.s_addr = daddr->v4.s_addr;
1806
1807 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
1808 break;
1809 #endif /* INET */
1810 #ifdef INET6
1811 case AF_INET6:
1812 h6 = mtod(m, struct ip6_hdr *);
1813
1814 /* IP header fields included in the TCP checksum */
1815 h6->ip6_nxt = IPPROTO_TCP;
1816 h6->ip6_plen = htons(tlen);
1817 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
1818 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
1819
1820 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
1821 break;
1822 #endif /* INET6 */
1823 }
1824
1825 /* TCP header */
1826 th->th_sport = sport;
1827 th->th_dport = dport;
1828 th->th_seq = htonl(seq);
1829 th->th_ack = htonl(ack);
1830 th->th_off = tlen >> 2;
1831 th->th_flags = flags;
1832 th->th_win = htons(win);
1833
1834 if (mss) {
1835 opt = (char *)(th + 1);
1836 opt[0] = TCPOPT_MAXSEG;
1837 opt[1] = 4;
1838 mss = htons(mss);
1839 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
1840 }
1841
1842 switch (af) {
1843 #ifdef INET
1844 case AF_INET:
1845 /* TCP checksum */
1846 th->th_sum = in_cksum(m, len);
1847
1848 /* Finish the IP header */
1849 h->ip_v = 4;
1850 h->ip_hl = sizeof(*h) >> 2;
1851 h->ip_tos = IPTOS_LOWDELAY;
1852 h->ip_len = len;
1853 h->ip_off = path_mtu_discovery ? IP_DF : 0;
1854 h->ip_ttl = ttl ? ttl : ip_defttl;
1855 h->ip_sum = 0;
1856 if (eh == NULL) {
1857 lwkt_reltoken(&pf_token);
1858 ip_output(m, NULL, NULL, 0, NULL, NULL);
1859 lwkt_gettoken(&pf_token);
1860 } else {
1861 struct route ro;
1862 struct rtentry rt;
1863 struct ether_header *e = (void *)ro.ro_dst.sa_data;
1864
1865 if (ifp == NULL) {
1866 m_freem(m);
1867 return;
1868 }
1869 rt.rt_ifp = ifp;
1870 ro.ro_rt = &rt;
1871 ro.ro_dst.sa_len = sizeof(ro.ro_dst);
1872 ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT;
1873 bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN);
1874 bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN);
1875 e->ether_type = eh->ether_type;
1876 /* XXX_IMPORT: later */
1877 lwkt_reltoken(&pf_token);
1878 ip_output(m, NULL, &ro, 0, NULL, NULL);
1879 lwkt_gettoken(&pf_token);
1880 }
1881 break;
1882 #endif /* INET */
1883 #ifdef INET6
1884 case AF_INET6:
1885 /* TCP checksum */
1886 th->th_sum = in6_cksum(m, IPPROTO_TCP,
1887 sizeof(struct ip6_hdr), tlen);
1888
1889 h6->ip6_vfc |= IPV6_VERSION;
1890 h6->ip6_hlim = IPV6_DEFHLIM;
1891
1892 lwkt_reltoken(&pf_token);
1893 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
1894 lwkt_gettoken(&pf_token);
1895 break;
1896 #endif /* INET6 */
1897 }
1898 }
1899
1900 void
1901 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
1902 struct pf_rule *r)
1903 {
1904 struct mbuf *m0;
1905
1906 /*
1907 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
1908 * so make sure pf.flags is clear.
1909 */
1910 if ((m0 = m_copy(m, 0, M_COPYALL)) == NULL)
1911 return;
1912
1913 m0->m_pkthdr.fw_flags |= PF_MBUF_TAGGED;
1914 m0->m_pkthdr.pf.flags = 0;
1915 /* XXX Re-Check when Upgrading to > 4.4 */
1916 m0->m_pkthdr.pf.statekey = NULL;
1917
1918 if (r->rtableid >= 0)
1919 m0->m_pkthdr.pf.rtableid = r->rtableid;
1920
1921 #ifdef ALTQ
1922 if (r->qid) {
1923 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
1924 m0->m_pkthdr.pf.qid = r->qid;
1925 m0->m_pkthdr.pf.ecn_af = af;
1926 m0->m_pkthdr.pf.hdr = mtod(m0, struct ip *);
1927 }
1928 #endif /* ALTQ */
1929
1930 switch (af) {
1931 #ifdef INET
1932 case AF_INET:
1933 icmp_error(m0, type, code, 0, 0);
1934 break;
1935 #endif /* INET */
1936 #ifdef INET6
1937 case AF_INET6:
1938 icmp6_error(m0, type, code, 0);
1939 break;
1940 #endif /* INET6 */
1941 }
1942 }
1943
1944 /*
1945 * Return 1 if the addresses a and b match (with mask m), otherwise return 0.
1946 * If n is 0, they match if they are equal. If n is != 0, they match if they
1947 * are different.
1948 */
1949 int
1950 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
1951 struct pf_addr *b, sa_family_t af)
1952 {
1953 int match = 0;
1954
1955 switch (af) {
1956 #ifdef INET
1957 case AF_INET:
1958 if ((a->addr32[0] & m->addr32[0]) ==
1959 (b->addr32[0] & m->addr32[0]))
1960 match++;
1961 break;
1962 #endif /* INET */
1963 #ifdef INET6
1964 case AF_INET6:
1965 if (((a->addr32[0] & m->addr32[0]) ==
1966 (b->addr32[0] & m->addr32[0])) &&
1967 ((a->addr32[1] & m->addr32[1]) ==
1968 (b->addr32[1] & m->addr32[1])) &&
1969 ((a->addr32[2] & m->addr32[2]) ==
1970 (b->addr32[2] & m->addr32[2])) &&
1971 ((a->addr32[3] & m->addr32[3]) ==
1972 (b->addr32[3] & m->addr32[3])))
1973 match++;
1974 break;
1975 #endif /* INET6 */
1976 }
1977 if (match) {
1978 if (n)
1979 return (0);
1980 else
1981 return (1);
1982 } else {
1983 if (n)
1984 return (1);
1985 else
1986 return (0);
1987 }
1988 }
1989
1990 /*
1991 * Return 1 if b <= a <= e, otherwise return 0.
1992 */
1993 int
1994 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e,
1995 struct pf_addr *a, sa_family_t af)
1996 {
1997 switch (af) {
1998 #ifdef INET
1999 case AF_INET:
2000 if ((a->addr32[0] < b->addr32[0]) ||
2001 (a->addr32[0] > e->addr32[0]))
2002 return (0);
2003 break;
2004 #endif /* INET */
2005 #ifdef INET6
2006 case AF_INET6: {
2007 int i;
2008
2009 /* check a >= b */
2010 for (i = 0; i < 4; ++i)
2011 if (a->addr32[i] > b->addr32[i])
2012 break;
2013 else if (a->addr32[i] < b->addr32[i])
2014 return (0);
2015 /* check a <= e */
2016 for (i = 0; i < 4; ++i)
2017 if (a->addr32[i] < e->addr32[i])
2018 break;
2019 else if (a->addr32[i] > e->addr32[i])
2020 return (0);
2021 break;
2022 }
2023 #endif /* INET6 */
2024 }
2025 return (1);
2026 }
2027
2028 int
2029 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
2030 {
2031 switch (op) {
2032 case PF_OP_IRG:
2033 return ((p > a1) && (p < a2));
2034 case PF_OP_XRG:
2035 return ((p < a1) || (p > a2));
2036 case PF_OP_RRG:
2037 return ((p >= a1) && (p <= a2));
2038 case PF_OP_EQ:
2039 return (p == a1);
2040 case PF_OP_NE:
2041 return (p != a1);
2042 case PF_OP_LT:
2043 return (p < a1);
2044 case PF_OP_LE:
2045 return (p <= a1);
2046 case PF_OP_GT:
2047 return (p > a1);
2048 case PF_OP_GE:
2049 return (p >= a1);
2050 }
2051 return (0); /* never reached */
2052 }
2053
2054 int
2055 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
2056 {
2057 a1 = ntohs(a1);
2058 a2 = ntohs(a2);
2059 p = ntohs(p);
2060 return (pf_match(op, a1, a2, p));
2061 }
2062
2063 int
2064 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
2065 {
2066 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2067 return (0);
2068 return (pf_match(op, a1, a2, u));
2069 }
2070
2071 int
2072 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
2073 {
2074 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2075 return (0);
2076 return (pf_match(op, a1, a2, g));
2077 }
2078
2079 int
2080 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag)
2081 {
2082 if (*tag == -1)
2083 *tag = m->m_pkthdr.pf.tag;
2084
2085 return ((!r->match_tag_not && r->match_tag == *tag) ||
2086 (r->match_tag_not && r->match_tag != *tag));
2087 }
2088
2089 int
2090 pf_tag_packet(struct mbuf *m, int tag, int rtableid)
2091 {
2092 if (tag <= 0 && rtableid < 0)
2093 return (0);
2094
2095 if (tag > 0)
2096 m->m_pkthdr.pf.tag = tag;
2097 if (rtableid >= 0)
2098 m->m_pkthdr.pf.rtableid = rtableid;
2099
2100 return (0);
2101 }
2102
2103 void
2104 pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n,
2105 struct pf_rule **r, struct pf_rule **a, int *match)
2106 {
2107 struct pf_anchor_stackframe *f;
2108
2109 (*r)->anchor->match = 0;
2110 if (match)
2111 *match = 0;
2112 if (*depth >= NELEM(pf_anchor_stack)) {
2113 kprintf("pf_step_into_anchor: stack overflow\n");
2114 *r = TAILQ_NEXT(*r, entries);
2115 return;
2116 } else if (*depth == 0 && a != NULL)
2117 *a = *r;
2118 f = pf_anchor_stack + (*depth)++;
2119 f->rs = *rs;
2120 f->r = *r;
2121 if ((*r)->anchor_wildcard) {
2122 f->parent = &(*r)->anchor->children;
2123 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) ==
2124 NULL) {
2125 *r = NULL;
2126 return;
2127 }
2128 *rs = &f->child->ruleset;
2129 } else {
2130 f->parent = NULL;
2131 f->child = NULL;
2132 *rs = &(*r)->anchor->ruleset;
2133 }
2134 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2135 }
2136
2137 int
2138 pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n,
2139 struct pf_rule **r, struct pf_rule **a, int *match)
2140 {
2141 struct pf_anchor_stackframe *f;
2142 int quick = 0;
2143
2144 do {
2145 if (*depth <= 0)
2146 break;
2147 f = pf_anchor_stack + *depth - 1;
2148 if (f->parent != NULL && f->child != NULL) {
2149 if (f->child->match ||
2150 (match != NULL && *match)) {
2151 f->r->anchor->match = 1;
2152 *match = 0;
2153 }
2154 f->child = RB_NEXT(pf_anchor_node, f->parent, f->child);
2155 if (f->child != NULL) {
2156 *rs = &f->child->ruleset;
2157 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2158 if (*r == NULL)
2159 continue;
2160 else
2161 break;
2162 }
2163 }
2164 (*depth)--;
2165 if (*depth == 0 && a != NULL)
2166 *a = NULL;
2167 *rs = f->rs;
2168 if (f->r->anchor->match || (match != NULL && *match))
2169 quick = f->r->quick;
2170 *r = TAILQ_NEXT(f->r, entries);
2171 } while (*r == NULL);
2172
2173 return (quick);
2174 }
2175
2176 #ifdef INET6
2177 void
2178 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
2179 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
2180 {
2181 switch (af) {
2182 #ifdef INET
2183 case AF_INET:
2184 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2185 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2186 break;
2187 #endif /* INET */
2188 case AF_INET6:
2189 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2190 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2191 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
2192 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
2193 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
2194 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
2195 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
2196 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
2197 break;
2198 }
2199 }
2200
2201 void
2202 pf_addr_inc(struct pf_addr *addr, sa_family_t af)
2203 {
2204 switch (af) {
2205 #ifdef INET
2206 case AF_INET:
2207 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
2208 break;
2209 #endif /* INET */
2210 case AF_INET6:
2211 if (addr->addr32[3] == 0xffffffff) {
2212 addr->addr32[3] = 0;
2213 if (addr->addr32[2] == 0xffffffff) {
2214 addr->addr32[2] = 0;
2215 if (addr->addr32[1] == 0xffffffff) {
2216 addr->addr32[1] = 0;
2217 addr->addr32[0] =
2218 htonl(ntohl(addr->addr32[0]) + 1);
2219 } else
2220 addr->addr32[1] =
2221 htonl(ntohl(addr->addr32[1]) + 1);
2222 } else
2223 addr->addr32[2] =
2224 htonl(ntohl(addr->addr32[2]) + 1);
2225 } else
2226 addr->addr32[3] =
2227 htonl(ntohl(addr->addr32[3]) + 1);
2228 break;
2229 }
2230 }
2231 #endif /* INET6 */
2232
2233 #define mix(a,b,c) \
2234 do { \
2235 a -= b; a -= c; a ^= (c >> 13); \
2236 b -= c; b -= a; b ^= (a << 8); \
2237 c -= a; c -= b; c ^= (b >> 13); \
2238 a -= b; a -= c; a ^= (c >> 12); \
2239 b -= c; b -= a; b ^= (a << 16); \
2240 c -= a; c -= b; c ^= (b >> 5); \
2241 a -= b; a -= c; a ^= (c >> 3); \
2242 b -= c; b -= a; b ^= (a << 10); \
2243 c -= a; c -= b; c ^= (b >> 15); \
2244 } while (0)
2245
2246 /*
2247 * hash function based on bridge_hash in if_bridge.c
2248 */
2249 void
2250 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash,
2251 struct pf_poolhashkey *key, sa_family_t af)
2252 {
2253 u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0];
2254
2255 switch (af) {
2256 #ifdef INET
2257 case AF_INET:
2258 a += inaddr->addr32[0];
2259 b += key->key32[1];
2260 mix(a, b, c);
2261 hash->addr32[0] = c + key->key32[2];
2262 break;
2263 #endif /* INET */
2264 #ifdef INET6
2265 case AF_INET6:
2266 a += inaddr->addr32[0];
2267 b += inaddr->addr32[2];
2268 mix(a, b, c);
2269 hash->addr32[0] = c;
2270 a += inaddr->addr32[1];
2271 b += inaddr->addr32[3];
2272 c += key->key32[1];
2273 mix(a, b, c);
2274 hash->addr32[1] = c;
2275 a += inaddr->addr32[2];
2276 b += inaddr->addr32[1];
2277 c += key->key32[2];
2278 mix(a, b, c);
2279 hash->addr32[2] = c;
2280 a += inaddr->addr32[3];
2281 b += inaddr->addr32[0];
2282 c += key->key32[3];
2283 mix(a, b, c);
2284 hash->addr32[3] = c;
2285 break;
2286 #endif /* INET6 */
2287 }
2288 }
2289
2290 int
2291 pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr,
2292 struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn)
2293 {
2294 unsigned char hash[16];
2295 struct pf_pool *rpool = &r->rpool;
2296 struct pf_addr *raddr = &rpool->cur->addr.v.a.addr;
2297 struct pf_addr *rmask = &rpool->cur->addr.v.a.mask;
2298 struct pf_pooladdr *acur = rpool->cur;
2299 struct pf_src_node k;
2300
2301 if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR &&
2302 (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
2303 k.af = af;
2304 PF_ACPY(&k.addr, saddr, af);
2305 if (r->rule_flag & PFRULE_RULESRCTRACK ||
2306 r->rpool.opts & PF_POOL_STICKYADDR)
2307 k.rule.ptr = r;
2308 else
2309 k.rule.ptr = NULL;
2310 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
2311 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
2312 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) {
2313 PF_ACPY(naddr, &(*sn)->raddr, af);
2314 if (pf_status.debug >= PF_DEBUG_MISC) {
2315 kprintf("pf_map_addr: src tracking maps ");
2316 pf_print_host(&k.addr, 0, af);
2317 kprintf(" to ");
2318 pf_print_host(naddr, 0, af);
2319 kprintf("\n");
2320 }
2321 return (0);
2322 }
2323 }
2324
2325 if (rpool->cur->addr.type == PF_ADDR_NOROUTE)
2326 return (1);
2327 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
2328 switch (af) {
2329 #ifdef INET
2330 case AF_INET:
2331 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
2332 (rpool->opts & PF_POOL_TYPEMASK) !=
2333 PF_POOL_ROUNDROBIN)
2334 return (1);
2335 raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
2336 rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
2337 break;
2338 #endif /* INET */
2339 #ifdef INET6
2340 case AF_INET6:
2341 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
2342 (rpool->opts & PF_POOL_TYPEMASK) !=
2343 PF_POOL_ROUNDROBIN)
2344 return (1);
2345 raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
2346 rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
2347 break;
2348 #endif /* INET6 */
2349 }
2350 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
2351 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN)
2352 return (1); /* unsupported */
2353 } else {
2354 raddr = &rpool->cur->addr.v.a.addr;
2355 rmask = &rpool->cur->addr.v.a.mask;
2356 }
2357
2358 switch (rpool->opts & PF_POOL_TYPEMASK) {
2359 case PF_POOL_NONE:
2360 PF_ACPY(naddr, raddr, af);
2361 break;
2362 case PF_POOL_BITMASK:
2363 PF_POOLMASK(naddr, raddr, rmask, saddr, af);
2364 break;
2365 case PF_POOL_RANDOM:
2366 if (init_addr != NULL && PF_AZERO(init_addr, af)) {
2367 switch (af) {
2368 #ifdef INET
2369 case AF_INET:
2370 rpool->counter.addr32[0] = htonl(karc4random());
2371 break;
2372 #endif /* INET */
2373 #ifdef INET6
2374 case AF_INET6:
2375 if (rmask->addr32[3] != 0xffffffff)
2376 rpool->counter.addr32[3] =
2377 htonl(karc4random());
2378 else
2379 break;
2380 if (rmask->addr32[2] != 0xffffffff)
2381 rpool->counter.addr32[2] =
2382 htonl(karc4random());
2383 else
2384 break;
2385 if (rmask->addr32[1] != 0xffffffff)
2386 rpool->counter.addr32[1] =
2387 htonl(karc4random());
2388 else
2389 break;
2390 if (rmask->addr32[0] != 0xffffffff)
2391 rpool->counter.addr32[0] =
2392 htonl(karc4random());
2393 break;
2394 #endif /* INET6 */
2395 }
2396 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
2397 PF_ACPY(init_addr, naddr, af);
2398
2399 } else {
2400 PF_AINC(&rpool->counter, af);
2401 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
2402 }
2403 break;
2404 case PF_POOL_SRCHASH:
2405 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af);
2406 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af);
2407 break;
2408 case PF_POOL_ROUNDROBIN:
2409 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
2410 if (!pfr_pool_get(rpool->cur->addr.p.tbl,
2411 &rpool->tblidx, &rpool->counter,
2412 &raddr, &rmask, af))
2413 goto get_addr;
2414 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
2415 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
2416 &rpool->tblidx, &rpool->counter,
2417 &raddr, &rmask, af))
2418 goto get_addr;
2419 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
2420 goto get_addr;
2421
2422 try_next:
2423 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL)
2424 rpool->cur = TAILQ_FIRST(&rpool->list);
2425 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
2426 rpool->tblidx = -1;
2427 if (pfr_pool_get(rpool->cur->addr.p.tbl,
2428 &rpool->tblidx, &rpool->counter,
2429 &raddr, &rmask, af)) {
2430 /* table contains no address of type 'af' */
2431 if (rpool->cur != acur)
2432 goto try_next;
2433 return (1);
2434 }
2435 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
2436 rpool->tblidx = -1;
2437 if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
2438 &rpool->tblidx, &rpool->counter,
2439 &raddr, &rmask, af)) {
2440 /* table contains no address of type 'af' */
2441 if (rpool->cur != acur)
2442 goto try_next;
2443 return (1);
2444 }
2445 } else {
2446 raddr = &rpool->cur->addr.v.a.addr;
2447 rmask = &rpool->cur->addr.v.a.mask;
2448 PF_ACPY(&rpool->counter, raddr, af);
2449 }
2450
2451 get_addr:
2452 PF_ACPY(naddr, &rpool->counter, af);
2453 if (init_addr != NULL && PF_AZERO(init_addr, af))
2454 PF_ACPY(init_addr, naddr, af);
2455 PF_AINC(&rpool->counter, af);
2456 break;
2457 }
2458 if (*sn != NULL)
2459 PF_ACPY(&(*sn)->raddr, naddr, af);
2460
2461 if (pf_status.debug >= PF_DEBUG_MISC &&
2462 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
2463 kprintf("pf_map_addr: selected address ");
2464 pf_print_host(naddr, 0, af);
2465 kprintf("\n");
2466 }
2467
2468 return (0);
2469 }
2470
2471 int
2472 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r,
2473 struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport,
2474 struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high,
2475 struct pf_src_node **sn)
2476 {
2477 struct pf_state_key_cmp key;
2478 struct pf_addr init_addr;
2479 u_int16_t cut;
2480
2481 bzero(&init_addr, sizeof(init_addr));
2482 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
2483 return (1);
2484
2485 if (proto == IPPROTO_ICMP) {
2486 low = 1;
2487 high = 65535;
2488 }
2489
2490 do {
2491 key.af = af;
2492 key.proto = proto;
2493 PF_ACPY(&key.addr[1], daddr, key.af);
2494 PF_ACPY(&key.addr[0], naddr, key.af);
2495 key.port[1] = dport;
2496
2497 /*
2498 * port search; start random, step;
2499 * similar 2 portloop in in_pcbbind
2500 */
2501 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP ||
2502 proto == IPPROTO_ICMP)) {
2503 key.port[0] = dport;
2504 if (pf_find_state_all(&key, PF_IN, NULL) == NULL)
2505 return (0);
2506 } else if (low == 0 && high == 0) {
2507 key.port[0] = *nport;
2508 if (pf_find_state_all(&key, PF_IN, NULL) == NULL)
2509 return (0);
2510 } else if (low == high) {
2511 key.port[0] = htons(low);
2512 if (pf_find_state_all(&key, PF_IN, NULL) == NULL) {
2513 *nport = htons(low);
2514 return (0);
2515 }
2516 } else {
2517 u_int16_t tmp;
2518
2519 if (low > high) {
2520 tmp = low;
2521 low = high;
2522 high = tmp;
2523 }
2524 /* low < high */
2525 cut = htonl(karc4random()) % (1 + high - low) + low;
2526 /* low <= cut <= high */
2527 for (tmp = cut; tmp <= high; ++(tmp)) {
2528 key.port[0] = htons(tmp);
2529 if (pf_find_state_all(&key, PF_IN, NULL) ==
2530 NULL && !in_baddynamic(tmp, proto)) {
2531 *nport = htons(tmp);
2532 return (0);
2533 }
2534 }
2535 for (tmp = cut - 1; tmp >= low; --(tmp)) {
2536 key.port[0] = htons(tmp);
2537 if (pf_find_state_all(&key, PF_IN, NULL) ==
2538 NULL && !in_baddynamic(tmp, proto)) {
2539 *nport = htons(tmp);
2540 return (0);
2541 }
2542 }
2543 }
2544
2545 switch (r->rpool.opts & PF_POOL_TYPEMASK) {
2546 case PF_POOL_RANDOM:
2547 case PF_POOL_ROUNDROBIN:
2548 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
2549 return (1);
2550 break;
2551 case PF_POOL_NONE:
2552 case PF_POOL_SRCHASH:
2553 case PF_POOL_BITMASK:
2554 default:
2555 return (1);
2556 }
2557 } while (! PF_AEQ(&init_addr, naddr, af) );
2558 return (1); /* none available */
2559 }
2560
2561 struct pf_rule *
2562 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
2563 int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport,
2564 struct pf_addr *daddr, u_int16_t dport, int rs_num)
2565 {
2566 struct pf_rule *r, *rm = NULL;
2567 struct pf_ruleset *ruleset = NULL;
2568 int tag = -1;
2569 int rtableid = -1;
2570 int asd = 0;
2571
2572 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr);
2573 while (r && rm == NULL) {
2574 struct pf_rule_addr *src = NULL, *dst = NULL;
2575 struct pf_addr_wrap *xdst = NULL;
2576
2577 if (r->action == PF_BINAT && direction == PF_IN) {
2578 src = &r->dst;
2579 if (r->rpool.cur != NULL)
2580 xdst = &r->rpool.cur->addr;
2581 } else {
2582 src = &r->src;
2583 dst = &r->dst;
2584 }
2585
2586 r->evaluations++;
2587 if (pfi_kif_match(r->kif, kif) == r->ifnot)
2588 r = r->skip[PF_SKIP_IFP].ptr;
2589 else if (r->direction && r->direction != direction)
2590 r = r->skip[PF_SKIP_DIR].ptr;
2591 else if (r->af && r->af != pd->af)
2592 r = r->skip[PF_SKIP_AF].ptr;
2593 else if (r->proto && r->proto != pd->proto)
2594 r = r->skip[PF_SKIP_PROTO].ptr;
2595 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af,
2596 src->neg, kif))
2597 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR :
2598 PF_SKIP_DST_ADDR].ptr;
2599 else if (src->port_op && !pf_match_port(src->port_op,
2600 src->port[0], src->port[1], sport))
2601 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT :
2602 PF_SKIP_DST_PORT].ptr;
2603 else if (dst != NULL &&
2604 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL))
2605 r = r->skip[PF_SKIP_DST_ADDR].ptr;
2606 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af,
2607 0, NULL))
2608 r = TAILQ_NEXT(r, entries);
2609 else if (dst != NULL && dst->port_op &&
2610 !pf_match_port(dst->port_op, dst->port[0],
2611 dst->port[1], dport))
2612 r = r->skip[PF_SKIP_DST_PORT].ptr;
2613 else if (r->match_tag && !pf_match_tag(m, r, &tag))
2614 r = TAILQ_NEXT(r, entries);
2615 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto !=
2616 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m,
2617 off, pd->hdr.tcp), r->os_fingerprint)))
2618 r = TAILQ_NEXT(r, entries);
2619 else {
2620 if (r->tag)
2621 tag = r->tag;
2622 if (r->rtableid >= 0)
2623 rtableid = r->rtableid;
2624 if (r->anchor == NULL) {
2625 rm = r;
2626 } else
2627 pf_step_into_anchor(&asd, &ruleset, rs_num,
2628 &r, NULL, NULL);
2629 }
2630 if (r == NULL)
2631 pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r,
2632 NULL, NULL);
2633 }
2634 if (pf_tag_packet(m, tag, rtableid))
2635 return (NULL);
2636 if (rm != NULL && (rm->action == PF_NONAT ||
2637 rm->action == PF_NORDR || rm->action == PF_NOBINAT))
2638 return (NULL);
2639 return (rm);
2640 }
2641
2642 struct pf_rule *
2643 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction,
2644 struct pfi_kif *kif, struct pf_src_node **sn,
2645 struct pf_state_key **skw, struct pf_state_key **sks,
2646 struct pf_state_key **skp, struct pf_state_key **nkp,
2647 struct pf_addr *saddr, struct pf_addr *daddr,
2648 u_int16_t sport, u_int16_t dport)
2649 {
2650 struct pf_rule *r = NULL;
2651
2652
2653 if (direction == PF_OUT) {
2654 r = pf_match_translation(pd, m, off, direction, kif, saddr,
2655 sport, daddr, dport, PF_RULESET_BINAT);
2656 if (r == NULL)
2657 r = pf_match_translation(pd, m, off, direction, kif,
2658 saddr, sport, daddr, dport, PF_RULESET_NAT);
2659 } else {
2660 r = pf_match_translation(pd, m, off, direction, kif, saddr,
2661 sport, daddr, dport, PF_RULESET_RDR);
2662 if (r == NULL)
2663 r = pf_match_translation(pd, m, off, direction, kif,
2664 saddr, sport, daddr, dport, PF_RULESET_BINAT);
2665 }
2666
2667 if (r != NULL) {
2668 struct pf_addr *naddr;
2669 u_int16_t *nport;
2670
2671 if (pf_state_key_setup(pd, r, skw, sks, skp, nkp,
2672 saddr, daddr, sport, dport))
2673 return r;
2674
2675 /* XXX We only modify one side for now. */
2676 naddr = &(*nkp)->addr[1];
2677 nport = &(*nkp)->port[1];
2678
2679 /*
2680 * NOTE: Currently all translations will clear
2681 * BRIDGE_MBUF_TAGGED, telling the bridge to
2682 * ignore the original input encapsulation.
2683 */
2684 switch (r->action) {
2685 case PF_NONAT:
2686 case PF_NOBINAT:
2687 case PF_NORDR:
2688 return (NULL);
2689 case PF_NAT:
2690 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
2691 if (pf_get_sport(pd->af, pd->proto, r, saddr,
2692 daddr, dport, naddr, nport, r->rpool.proxy_port[0],
2693 r->rpool.proxy_port[1], sn)) {
2694 DPFPRINTF(PF_DEBUG_MISC,
2695 ("pf: NAT proxy port allocation "
2696 "(%u-%u) failed\n",
2697 r->rpool.proxy_port[0],
2698 r->rpool.proxy_port[1]));
2699 return (NULL);
2700 }
2701 break;
2702 case PF_BINAT:
2703 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
2704 switch (direction) {
2705 case PF_OUT:
2706 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){
2707 switch (pd->af) {
2708 #ifdef INET
2709 case AF_INET:
2710 if (r->rpool.cur->addr.p.dyn->
2711 pfid_acnt4 < 1)
2712 return (NULL);
2713 PF_POOLMASK(naddr,
2714 &r->rpool.cur->addr.p.dyn->
2715 pfid_addr4,
2716 &r->rpool.cur->addr.p.dyn->
2717 pfid_mask4,
2718 saddr, AF_INET);
2719 break;
2720 #endif /* INET */
2721 #ifdef INET6
2722 case AF_INET6:
2723 if (r->rpool.cur->addr.p.dyn->
2724 pfid_acnt6 < 1)
2725 return (NULL);
2726 PF_POOLMASK(naddr,
2727 &r->rpool.cur->addr.p.dyn->
2728 pfid_addr6,
2729 &r->rpool.cur->addr.p.dyn->
2730 pfid_mask6,
2731 saddr, AF_INET6);
2732 break;
2733 #endif /* INET6 */
2734 }
2735 } else
2736 PF_POOLMASK(naddr,
2737 &r->rpool.cur->addr.v.a.addr,
2738 &r->rpool.cur->addr.v.a.mask,
2739 saddr, pd->af);
2740 break;
2741 case PF_IN:
2742 if (r->src.addr.type == PF_ADDR_DYNIFTL) {
2743 switch (pd->af) {
2744 #ifdef INET
2745 case AF_INET:
2746 if (r->src.addr.p.dyn->
2747 pfid_acnt4 < 1)
2748 return (NULL);
2749 PF_POOLMASK(naddr,
2750 &r->src.addr.p.dyn->
2751 pfid_addr4,
2752 &r->src.addr.p.dyn->
2753 pfid_mask4,
2754 daddr, AF_INET);
2755 break;
2756 #endif /* INET */
2757 #ifdef INET6
2758 case AF_INET6:
2759 if (r->src.addr.p.dyn->
2760 pfid_acnt6 < 1)
2761 return (NULL);
2762 PF_POOLMASK(naddr,
2763 &r->src.addr.p.dyn->
2764 pfid_addr6,
2765 &r->src.addr.p.dyn->
2766 pfid_mask6,
2767 daddr, AF_INET6);
2768 break;
2769 #endif /* INET6 */
2770 }
2771 } else
2772 PF_POOLMASK(naddr,
2773 &r->src.addr.v.a.addr,
2774 &r->src.addr.v.a.mask, daddr,
2775 pd->af);
2776 break;
2777 }
2778 break;
2779 case PF_RDR: {
2780 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
2781 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn))
2782 return (NULL);
2783 if ((r->rpool.opts & PF_POOL_TYPEMASK) ==
2784 PF_POOL_BITMASK)
2785 PF_POOLMASK(naddr, naddr,
2786 &r->rpool.cur->addr.v.a.mask, daddr,
2787 pd->af);
2788
2789 if (r->rpool.proxy_port[1]) {
2790 u_int32_t tmp_nport;
2791
2792 tmp_nport = ((ntohs(dport) -
2793 ntohs(r->dst.port[0])) %
2794 (r->rpool.proxy_port[1] -
2795 r->rpool.proxy_port[0] + 1)) +
2796 r->rpool.proxy_port[0];
2797
2798 /* wrap around if necessary */
2799 if (tmp_nport > 65535)
2800 tmp_nport -= 65535;
2801 *nport = htons((u_int16_t)tmp_nport);
2802 } else if (r->rpool.proxy_port[0])
2803 *nport = htons(r->rpool.proxy_port[0]);
2804 break;
2805 }
2806 default:
2807 return (NULL);
2808 }
2809 }
2810
2811 return (r);
2812 }
2813
2814 struct netmsg_hashlookup {
2815 struct netmsg_base base;
2816 struct inpcb **nm_pinp;
2817 struct inpcbinfo *nm_pcbinfo;
2818 struct pf_addr *nm_saddr;
2819 struct pf_addr *nm_daddr;
2820 uint16_t nm_sport;
2821 uint16_t nm_dport;
2822 sa_family_t nm_af;
2823 };
2824
2825 #ifdef PF_SOCKET_LOOKUP_DOMSG
2826 static void
2827 in_pcblookup_hash_handler(netmsg_t msg)
2828 {
2829 struct netmsg_hashlookup *rmsg = (struct netmsg_hashlookup *)msg;
2830
2831 if (rmsg->nm_af == AF_INET)
2832 *rmsg->nm_pinp = in_pcblookup_hash(rmsg->nm_pcbinfo,
2833 rmsg->nm_saddr->v4, rmsg->nm_sport, rmsg->nm_daddr->v4,
2834 rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL);
2835 #ifdef INET6
2836 else
2837 *rmsg->nm_pinp = in6_pcblookup_hash(rmsg->nm_pcbinfo,
2838 &rmsg->nm_saddr->v6, rmsg->nm_sport, &rmsg->nm_daddr->v6,
2839 rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL);
2840 #endif /* INET6 */
2841 lwkt_replymsg(&rmsg->base.lmsg, 0);
2842 }
2843 #endif /* PF_SOCKET_LOOKUP_DOMSG */
2844
2845 int
2846 pf_socket_lookup(int direction, struct pf_pdesc *pd)
2847 {
2848 struct pf_addr *saddr, *daddr;
2849 u_int16_t sport, dport;
2850 struct inpcbinfo *pi;
2851 struct inpcb *inp;
2852 struct netmsg_hashlookup *msg = NULL;
2853 #ifdef PF_SOCKET_LOOKUP_DOMSG
2854 struct netmsg_hashlookup msg0;
2855 #endif
2856 int pi_cpu = 0;
2857
2858 if (pd == NULL)
2859 return (-1);
2860 pd->lookup.uid = UID_MAX;
2861 pd->lookup.gid = GID_MAX;
2862 pd->lookup.pid = NO_PID;
2863 if (direction == PF_IN) {
2864 saddr = pd->src;
2865 daddr = pd->dst;
2866 } else {
2867 saddr = pd->dst;
2868 daddr = pd->src;
2869 }
2870 switch (pd->proto) {
2871 case IPPROTO_TCP:
2872 if (pd->hdr.tcp == NULL)
2873 return (-1);
2874 sport = pd->hdr.tcp->th_sport;
2875 dport = pd->hdr.tcp->th_dport;
2876
2877 pi_cpu = tcp_addrcpu(saddr->v4.s_addr, sport, daddr->v4.s_addr, dport);
2878 pi = &tcbinfo[pi_cpu];
2879 /*
2880 * Our netstack runs lockless on MP systems
2881 * (only for TCP connections at the moment).
2882 *
2883 * As we are not allowed to read another CPU's tcbinfo,
2884 * we have to ask that CPU via remote call to search the
2885 * table for us.
2886 *
2887 * Prepare a msg iff data belongs to another CPU.
2888 */
2889 if (pi_cpu != mycpu->gd_cpuid) {
2890 #ifdef PF_SOCKET_LOOKUP_DOMSG
2891 /*
2892 * NOTE:
2893 *
2894 * Following lwkt_domsg() is dangerous and could
2895 * lockup the network system, e.g.
2896 *
2897 * On 2 CPU system:
2898 * netisr0 domsg to netisr1 (due to lookup)
2899 * netisr1 domsg to netisr0 (due to lookup)
2900 *
2901 * We simply return -1 here, since we are probably
2902 * called before NAT, so the TCP packet should
2903 * already be on the correct CPU.
2904 */
2905 msg = &msg0;
2906 netmsg_init(&msg->base, NULL, &curthread->td_msgport,
2907 0, in_pcblookup_hash_handler);
2908 msg->nm_pinp = &inp;
2909 msg->nm_pcbinfo = pi;
2910 msg->nm_saddr = saddr;
2911 msg->nm_sport = sport;
2912 msg->nm_daddr = daddr;
2913 msg->nm_dport = dport;
2914 msg->nm_af = pd->af;
2915 #else /* !PF_SOCKET_LOOKUP_DOMSG */
2916 kprintf("pf_socket_lookup: tcp packet not on the "
2917 "correct cpu %d, cur cpu %d\n",
2918 pi_cpu, mycpuid);
2919 print_backtrace(-1);
2920 return -1;
2921 #endif /* PF_SOCKET_LOOKUP_DOMSG */
2922 }
2923 break;
2924 case IPPROTO_UDP:
2925 if (pd->hdr.udp == NULL)
2926 return (-1);
2927 sport = pd->hdr.udp->uh_sport;
2928 dport = pd->hdr.udp->uh_dport;
2929 pi = &udbinfo;
2930 break;
2931 default:
2932 return (-1);
2933 }
2934 if (direction != PF_IN) {
2935 u_int16_t p;
2936
2937 p = sport;
2938 sport = dport;
2939 dport = p;
2940 }
2941 switch (pd->af) {
2942 #ifdef INET6
2943 case AF_INET6:
2944 /*
2945 * Query other CPU, second part
2946 *
2947 * msg only gets initialized when:
2948 * 1) packet is TCP
2949 * 2) the info belongs to another CPU
2950 *
2951 * Use some switch/case magic to avoid code duplication.
2952 */
2953 if (msg == NULL) {
2954 inp = in6_pcblookup_hash(pi, &saddr->v6, sport,
2955 &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL);
2956
2957 if (inp == NULL)
2958 return (-1);
2959 break;
2960 }
2961 /* FALLTHROUGH if SMP and on other CPU */
2962 #endif /* INET6 */
2963 case AF_INET:
2964 if (msg != NULL) {
2965 lwkt_domsg(netisr_cpuport(pi_cpu),
2966 &msg->base.lmsg, 0);
2967 } else
2968 {
2969 inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4,
2970 dport, INPLOOKUP_WILDCARD, NULL);
2971 }
2972 if (inp == NULL)
2973 return (-1);
2974 break;
2975
2976 default:
2977 return (-1);
2978 }
2979 pd->lookup.uid = inp->inp_socket->so_cred->cr_uid;
2980 pd->lookup.gid = inp->inp_socket->so_cred->cr_groups[0];
2981 return (1);
2982 }
2983
2984 u_int8_t
2985 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
2986 {
2987 int hlen;
2988 u_int8_t hdr[60];
2989 u_int8_t *opt, optlen;
2990 u_int8_t wscale = 0;
2991
2992 hlen = th_off << 2; /* hlen <= sizeof(hdr) */
2993 if (hlen <= sizeof(struct tcphdr))
2994 return (0);
2995 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
2996 return (0);
2997 opt = hdr + sizeof(struct tcphdr);
2998 hlen -= sizeof(struct tcphdr);
2999 while (hlen >= 3) {
3000 switch (*opt) {
3001 case TCPOPT_EOL:
3002 case TCPOPT_NOP:
3003 ++opt;
3004 --hlen;
3005 break;
3006 case TCPOPT_WINDOW:
3007 wscale = opt[2];
3008 if (wscale > TCP_MAX_WINSHIFT)
3009 wscale = TCP_MAX_WINSHIFT;
3010 wscale |= PF_WSCALE_FLAG;
3011 /* FALLTHROUGH */
3012 default:
3013 optlen = opt[1];
3014 if (optlen < 2)
3015 optlen = 2;
3016 hlen -= optlen;
3017 opt += optlen;
3018 break;
3019 }
3020 }
3021 return (wscale);
3022 }
3023
3024 u_int16_t
3025 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
3026 {
3027 int hlen;
3028 u_int8_t hdr[60];
3029 u_int8_t *opt, optlen;
3030 u_int16_t mss = tcp_mssdflt;
3031
3032 hlen = th_off << 2; /* hlen <= sizeof(hdr) */
3033 if (hlen <= sizeof(struct tcphdr))
3034 return (0);
3035 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
3036 return (0);
3037 opt = hdr + sizeof(struct tcphdr);
3038 hlen -= sizeof(struct tcphdr);
3039 while (hlen >= TCPOLEN_MAXSEG) {
3040 switch (*opt) {
3041 case TCPOPT_EOL:
3042 case TCPOPT_NOP:
3043 ++opt;
3044 --hlen;
3045 break;
3046 case TCPOPT_MAXSEG:
3047 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
3048 /* FALLTHROUGH */
3049 default:
3050 optlen = opt[1];
3051 if (optlen < 2)
3052 optlen = 2;
3053 hlen -= optlen;
3054 opt += optlen;
3055 break;
3056 }
3057 }
3058 return (mss);
3059 }
3060
3061 u_int16_t
3062 pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer)
3063 {
3064 #ifdef INET
3065 struct sockaddr_in *dst;
3066 struct route ro;
3067 #endif /* INET */
3068 #ifdef INET6
3069 struct sockaddr_in6 *dst6;
3070 struct route_in6 ro6;
3071 #endif /* INET6 */
3072 struct rtentry *rt = NULL;
3073 int hlen = 0;
3074 u_int16_t mss = tcp_mssdflt;
3075
3076 switch (af) {
3077 #ifdef INET
3078 case AF_INET:
3079 hlen = sizeof(struct ip);
3080 bzero(&ro, sizeof(ro));
3081 dst = (struct sockaddr_in *)&ro.ro_dst;
3082 dst->sin_family = AF_INET;
3083 dst->sin_len = sizeof(*dst);
3084 dst->sin_addr = addr->v4;
3085 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING));
3086 rt = ro.ro_rt;
3087 break;
3088 #endif /* INET */
3089 #ifdef INET6
3090 case AF_INET6:
3091 hlen = sizeof(struct ip6_hdr);
3092 bzero(&ro6, sizeof(ro6));
3093 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst;
3094 dst6->sin6_family = AF_INET6;
3095 dst6->sin6_len = sizeof(*dst6);
3096 dst6->sin6_addr = addr->v6;
3097 rtalloc_ign((struct route *)&ro6, (RTF_CLONING | RTF_PRCLONING));
3098 rt = ro6.ro_rt;
3099 break;
3100 #endif /* INET6 */
3101 }
3102
3103 if (rt && rt->rt_ifp) {
3104 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr);
3105 mss = max(tcp_mssdflt, mss);
3106 RTFREE(rt);
3107 }
3108 mss = min(mss, offer);
3109 mss = max(mss, 64); /* sanity - at least max opt space */
3110 return (mss);
3111 }
3112
3113 void
3114 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr)
3115 {
3116 struct pf_rule *r = s->rule.ptr;
3117
3118 s->rt_kif = NULL;
3119 if (!r->rt || r->rt == PF_FASTROUTE)
3120 return;
3121 switch (s->key[PF_SK_WIRE]->af) {
3122 #ifdef INET
3123 case AF_INET:
3124 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL,
3125 &s->nat_src_node);
3126 s->rt_kif = r->rpool.cur->kif;
3127 break;
3128 #endif /* INET */
3129 #ifdef INET6
3130 case AF_INET6:
3131 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL,
3132 &s->nat_src_node);
3133 s->rt_kif = r->rpool.cur->kif;
3134 break;
3135 #endif /* INET6 */
3136 }
3137 }
3138
3139 u_int32_t
3140 pf_tcp_iss(struct pf_pdesc *pd)
3141 {
3142 MD5_CTX ctx;
3143 u_int32_t digest[4];
3144
3145 if (pf_tcp_secret_init == 0) {
3146 karc4rand(pf_tcp_secret, sizeof(pf_tcp_secret));
3147 MD5Init(&pf_tcp_secret_ctx);
3148 MD5Update(&pf_tcp_secret_ctx, pf_tcp_secret,
3149 sizeof(pf_tcp_secret));
3150 pf_tcp_secret_init = 1;
3151 }
3152 ctx = pf_tcp_secret_ctx;
3153
3154 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short));
3155 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short));
3156 if (pd->af == AF_INET6) {
3157 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr));
3158 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr));
3159 } else {
3160 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr));
3161 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr));
3162 }
3163 MD5Final((u_char *)digest, &ctx);
3164 pf_tcp_iss_off += 4096;
3165 return (digest[0] + pd->hdr.tcp->th_seq + pf_tcp_iss_off);
3166 }
3167
3168 int
3169 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction,
3170 struct pfi_kif *kif, struct mbuf *m, int off, void *h,
3171 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm,
3172 struct ifqueue *ifq, struct inpcb *inp)
3173 {
3174 struct pf_rule *nr = NULL;
3175 struct pf_addr *saddr = pd->src, *daddr = pd->dst;
3176 sa_family_t af = pd->af;
3177 struct pf_rule *r, *a = NULL;
3178 struct pf_ruleset *ruleset = NULL;
3179 struct pf_src_node *nsn = NULL;
3180 struct tcphdr *th = pd->hdr.tcp;
3181 struct pf_state_key *skw = NULL, *sks = NULL;
3182 struct pf_state_key *sk = NULL, *nk = NULL;
3183 u_short reason;
3184 int rewrite = 0, hdrlen = 0;
3185 int tag = -1, rtableid = -1;
3186 int asd = 0;
3187 int match = 0;
3188 int state_icmp = 0;
3189 u_int16_t sport = 0, dport = 0;
3190 u_int16_t bproto_sum = 0, bip_sum = 0;
3191 u_int8_t icmptype = 0, icmpcode = 0;
3192
3193
3194 if (direction == PF_IN && pf_check_congestion(ifq)) {
3195 REASON_SET(&reason, PFRES_CONGEST);
3196 return (PF_DROP);
3197 }
3198
3199 if (inp != NULL)
3200 pd->lookup.done = pf_socket_lookup(direction, pd);
3201 else if (debug_pfugidhack) {
3202 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n"));
3203 pd->lookup.done = pf_socket_lookup(direction, pd);
3204 }
3205
3206 switch (pd->proto) {
3207 case IPPROTO_TCP:
3208 sport = th->th_sport;
3209 dport = th->th_dport;
3210 hdrlen = sizeof(*th);
3211 break;
3212 case IPPROTO_UDP:
3213 sport = pd->hdr.udp->uh_sport;
3214 dport = pd->hdr.udp->uh_dport;
3215 hdrlen = sizeof(*pd->hdr.udp);
3216 break;
3217 #ifdef INET
3218 case IPPROTO_ICMP:
3219 if (pd->af != AF_INET)
3220 break;
3221 sport = dport = pd->hdr.icmp->icmp_id;
3222 hdrlen = sizeof(*pd->hdr.icmp);
3223 icmptype = pd->hdr.icmp->icmp_type;
3224 icmpcode = pd->hdr.icmp->icmp_code;
3225
3226 if (icmptype == ICMP_UNREACH ||
3227 icmptype == ICMP_SOURCEQUENCH ||
3228 icmptype == ICMP_REDIRECT ||
3229 icmptype == ICMP_TIMXCEED ||
3230 icmptype == ICMP_PARAMPROB)
3231 state_icmp++;
3232 break;
3233 #endif /* INET */
3234 #ifdef INET6
3235 case IPPROTO_ICMPV6:
3236 if (af != AF_INET6)
3237 break;
3238 sport = dport = pd->hdr.icmp6->icmp6_id;
3239 hdrlen = sizeof(*pd->hdr.icmp6);
3240 icmptype = pd->hdr.icmp6->icmp6_type;
3241 icmpcode = pd->hdr.icmp6->icmp6_code;
3242
3243 if (icmptype == ICMP6_DST_UNREACH ||
3244 icmptype == ICMP6_PACKET_TOO_BIG ||
3245 icmptype == ICMP6_TIME_EXCEEDED ||
3246 icmptype == ICMP6_PARAM_PROB)
3247 state_icmp++;
3248 break;
3249 #endif /* INET6 */
3250 default:
3251 sport = dport = hdrlen = 0;
3252 break;
3253 }
3254
3255 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3256
3257 /* check packet for BINAT/NAT/RDR */
3258 if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn,
3259 &skw, &sks, &sk, &nk, saddr, daddr, sport, dport)) != NULL) {
3260 if (nk == NULL || sk == NULL) {
3261 REASON_SET(&reason, PFRES_MEMORY);
3262 goto cleanup;
3263 }
3264
3265 if (pd->ip_sum)
3266 bip_sum = *pd->ip_sum;
3267
3268 m->m_flags &= ~M_HASH;
3269 switch (pd->proto) {
3270 case IPPROTO_TCP:
3271 bproto_sum = th->th_sum;
3272 pd->proto_sum = &th->th_sum;
3273
3274 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3275 nk->port[pd->sidx] != sport) {
3276 pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
3277 &th->th_sum, &nk->addr[pd->sidx],
3278 nk->port[pd->sidx], 0, af);
3279 pd->sport = &th->th_sport;
3280 sport = th->th_sport;
3281 }
3282
3283 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3284 nk->port[pd->didx] != dport) {
3285 pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
3286 &th->th_sum, &nk->addr[pd->didx],
3287 nk->port[pd->didx], 0, af);
3288 dport = th->th_dport;
3289 pd->dport = &th->th_dport;
3290 }
3291 rewrite++;
3292 break;
3293 case IPPROTO_UDP:
3294 bproto_sum = pd->hdr.udp->uh_sum;
3295 pd->proto_sum = &pd->hdr.udp->uh_sum;
3296
3297 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3298 nk->port[pd->sidx] != sport) {
3299 pf_change_ap(saddr, &pd->hdr.udp->uh_sport,
3300 pd->ip_sum, &pd->hdr.udp->uh_sum,
3301 &nk->addr[pd->sidx],
3302 nk->port[pd->sidx], 1, af);
3303 sport = pd->hdr.udp->uh_sport;
3304 pd->sport = &pd->hdr.udp->uh_sport;
3305 }
3306
3307 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3308 nk->port[pd->didx] != dport) {
3309 pf_change_ap(daddr, &pd->hdr.udp->uh_dport,
3310 pd->ip_sum, &pd->hdr.udp->uh_sum,
3311 &nk->addr[pd->didx],
3312 nk->port[pd->didx], 1, af);
3313 dport = pd->hdr.udp->uh_dport;
3314 pd->dport = &pd->hdr.udp->uh_dport;
3315 }
3316 rewrite++;
3317 break;
3318 #ifdef INET
3319 case IPPROTO_ICMP:
3320 nk->port[0] = nk->port[1];
3321 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET))
3322 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3323 nk->addr[pd->sidx].v4.s_addr, 0);
3324
3325 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET))
3326 pf_change_a(&daddr->v4.s_addr, pd->ip_sum,
3327 nk->addr[pd->didx].v4.s_addr, 0);
3328
3329 if (nk->port[1] != pd->hdr.icmp->icmp_id) {
3330 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup(
3331 pd->hdr.icmp->icmp_cksum, sport,
3332 nk->port[1], 0);
3333 pd->hdr.icmp->icmp_id = nk->port[1];
3334 pd->sport = &pd->hdr.icmp->icmp_id;
3335 }
3336 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
3337 break;
3338 #endif /* INET */
3339 #ifdef INET6
3340 case IPPROTO_ICMPV6:
3341 nk->port[0] = nk->port[1];
3342 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6))
3343 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
3344 &nk->addr[pd->sidx], 0);
3345
3346 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6))
3347 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
3348 &nk->addr[pd->didx], 0);
3349 rewrite++;
3350 break;
3351 #endif /* INET */
3352 default:
3353 switch (af) {
3354 #ifdef INET
3355 case AF_INET:
3356 if (PF_ANEQ(saddr,
3357 &nk->addr[pd->sidx], AF_INET))
3358 pf_change_a(&saddr->v4.s_addr,
3359 pd->ip_sum,
3360 nk->addr[pd->sidx].v4.s_addr, 0);
3361
3362 if (PF_ANEQ(daddr,
3363 &nk->addr[pd->didx], AF_INET))
3364 pf_change_a(&daddr->v4.s_addr,
3365 pd->ip_sum,
3366 nk->addr[pd->didx].v4.s_addr, 0);
3367 break;
3368 #endif /* INET */
3369 #ifdef INET6
3370 case AF_INET6:
3371 if (PF_ANEQ(saddr,
3372 &nk->addr[pd->sidx], AF_INET6))
3373 PF_ACPY(saddr, &nk->addr[pd->sidx], af);
3374
3375 if (PF_ANEQ(daddr,
3376 &nk->addr[pd->didx], AF_INET6))
3377 PF_ACPY(saddr, &nk->addr[pd->didx], af);
3378 break;
3379 #endif /* INET */
3380 }
3381 break;
3382 }
3383 if (nr->natpass)
3384 r = NULL;
3385 pd->nat_rule = nr;
3386 }
3387
3388 while (r != NULL) {
3389 r->evaluations++;
3390 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3391 r = r->skip[PF_SKIP_IFP].ptr;
3392 else if (r->direction && r->direction != direction)
3393 r = r->skip[PF_SKIP_DIR].ptr;
3394 else if (r->af && r->af != af)
3395 r = r->skip[PF_SKIP_AF].ptr;
3396 else if (r->proto && r->proto != pd->proto)
3397 r = r->skip[PF_SKIP_PROTO].ptr;
3398 else if (PF_MISMATCHAW(&r->src.addr, saddr, af,
3399 r->src.neg, kif))
3400 r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3401 /* tcp/udp only. port_op always 0 in other cases */
3402 else if (r->src.port_op && !pf_match_port(r->src.port_op,
3403 r->src.port[0], r->src.port[1], sport))
3404 r = r->skip[PF_SKIP_SRC_PORT].ptr;
3405 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af,
3406 r->dst.neg, NULL))
3407 r = r->skip[PF_SKIP_DST_ADDR].ptr;
3408 /* tcp/udp only. port_op always 0 in other cases */
3409 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
3410 r->dst.port[0], r->dst.port[1], dport))
3411 r = r->skip[PF_SKIP_DST_PORT].ptr;
3412 /* icmp only. type always 0 in other cases */
3413 else if (r->type && r->type != icmptype + 1)
3414 r = TAILQ_NEXT(r, entries);
3415 /* icmp only. type always 0 in other cases */
3416 else if (r->code && r->code != icmpcode + 1)
3417 r = TAILQ_NEXT(r, entries);
3418 else if (r->tos && !(r->tos == pd->tos))
3419 r = TAILQ_NEXT(r, entries);
3420 else if (r->rule_flag & PFRULE_FRAGMENT)
3421 r = TAILQ_NEXT(r, entries);
3422 else if (pd->proto == IPPROTO_TCP &&
3423 (r->flagset & th->th_flags) != r->flags)
3424 r = TAILQ_NEXT(r, entries);
3425 /* tcp/udp only. uid.op always 0 in other cases */
3426 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done =
3427 pf_socket_lookup(direction, pd), 1)) &&
3428 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
3429 pd->lookup.uid))
3430 r = TAILQ_NEXT(r, entries);
3431 /* tcp/udp only. gid.op always 0 in other cases */
3432 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done =
3433 pf_socket_lookup(direction, pd), 1)) &&
3434 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
3435 pd->lookup.gid))
3436 r = TAILQ_NEXT(r, entries);
3437 else if (r->prob &&
3438 r->prob <= karc4random())
3439 r = TAILQ_NEXT(r, entries);
3440 else if (r->match_tag && !pf_match_tag(m, r, &tag))
3441 r = TAILQ_NEXT(r, entries);
3442 else if (r->os_fingerprint != PF_OSFP_ANY &&
3443 (pd->proto != IPPROTO_TCP || !pf_osfp_match(
3444 pf_osfp_fingerprint(pd, m, off, th),
3445 r->os_fingerprint)))
3446 r = TAILQ_NEXT(r, entries);
3447 else {
3448 if (r->tag)
3449 tag = r->tag;
3450 if (r->rtableid >= 0)
3451 rtableid = r->rtableid;
3452 if (r->anchor == NULL) {
3453 match = 1;
3454 *rm = r;
3455 *am = a;
3456 *rsm = ruleset;
3457 if ((*rm)->quick)
3458 break;
3459 r = TAILQ_NEXT(r, entries);
3460 } else
3461 pf_step_into_anchor(&asd, &ruleset,
3462 PF_RULESET_FILTER, &r, &a, &match);
3463 }
3464 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
3465 PF_RULESET_FILTER, &r, &a, &match))
3466 break;
3467 }
3468 r = *rm;
3469 a = *am;
3470 ruleset = *rsm;
3471
3472 REASON_SET(&reason, PFRES_MATCH);
3473
3474 if (r->log || (nr != NULL && nr->log)) {
3475 if (rewrite)
3476 m_copyback(m, off, hdrlen, pd->hdr.any);
3477 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr,
3478 a, ruleset, pd);
3479 }
3480
3481 if ((r->action == PF_DROP) &&
3482 ((r->rule_flag & PFRULE_RETURNRST) ||
3483 (r->rule_flag & PFRULE_RETURNICMP) ||
3484 (r->rule_flag & PFRULE_RETURN))) {
3485 /* undo NAT changes, if they have taken place */
3486 if (nr != NULL) {
3487 PF_ACPY(saddr, &sk->addr[pd->sidx], af);
3488 PF_ACPY(daddr, &sk->addr[pd->didx], af);
3489 if (pd->sport)
3490 *pd->sport = sk->port[pd->sidx];
3491 if (pd->dport)
3492 *pd->dport = sk->port[pd->didx];
3493 if (pd->proto_sum)
3494 *pd->proto_sum = bproto_sum;
3495 if (pd->ip_sum)
3496 *pd->ip_sum = bip_sum;
3497 m_copyback(m, off, hdrlen, pd->hdr.any);
3498 }
3499 if (pd->proto == IPPROTO_TCP &&
3500 ((r->rule_flag & PFRULE_RETURNRST) ||
3501 (r->rule_flag & PFRULE_RETURN)) &&
3502 !(th->th_flags & TH_RST)) {
3503 u_int32_t ack = ntohl(th->th_seq) + pd->p_len;
3504 int len = 0;
3505 struct ip *h4;
3506 #ifdef INET6
3507 struct ip6_hdr *h6;
3508 #endif
3509 switch (af) {
3510 case AF_INET:
3511 h4 = mtod(m, struct ip *);
3512 len = h4->ip_len - off;
3513 break;
3514 #ifdef INET6
3515 case AF_INET6:
3516 h6 = mtod(m, struct ip6_hdr *);
3517 len = h6->ip6_plen - (off - sizeof(*h6));
3518 break;
3519 #endif
3520 }
3521
3522 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af))
3523 REASON_SET(&reason, PFRES_PROTCKSUM);
3524 else {
3525 if (th->th_flags & TH_SYN)
3526 ack++;
3527 if (th->th_flags & TH_FIN)
3528 ack++;
3529 pf_send_tcp(r, af, pd->dst,
3530 pd->src, th->th_dport, th->th_sport,
3531 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
3532 r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp);
3533 }
3534 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET &&
3535 r->return_icmp)
3536 pf_send_icmp(m, r->return_icmp >> 8,
3537 r->return_icmp & 255, af, r);
3538 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 &&
3539 r->return_icmp6)
3540 pf_send_icmp(m, r->return_icmp6 >> 8,
3541 r->return_icmp6 & 255, af, r);
3542 }
3543
3544 if (r->action == PF_DROP)
3545 goto cleanup;
3546
3547 if (pf_tag_packet(m, tag, rtableid)) {
3548 REASON_SET(&reason, PFRES_MEMORY);
3549 goto cleanup;
3550 }
3551
3552 if (!state_icmp && (r->keep_state || nr != NULL ||
3553 (pd->flags & PFDESC_TCP_NORM))) {
3554 int action;
3555 action = pf_create_state(r, nr, a, pd, nsn, skw, sks, nk, sk, m,
3556 off, sport, dport, &rewrite, kif, sm, tag, bproto_sum,
3557 bip_sum, hdrlen);
3558 if (action != PF_PASS)
3559 return (action);
3560 }
3561
3562 /* copy back packet headers if we performed NAT operations */
3563 if (rewrite)
3564 m_copyback(m, off, hdrlen, pd->hdr.any);
3565
3566 return (PF_PASS);
3567
3568 cleanup:
3569 if (sk != NULL)
3570 kfree(sk, M_PFSTATEKEYPL);
3571 if (nk != NULL)
3572 kfree(nk, M_PFSTATEKEYPL);
3573 return (PF_DROP);
3574 }
3575
3576 static __inline int
3577 pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a,
3578 struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *skw,
3579 struct pf_state_key *sks, struct pf_state_key *nk, struct pf_state_key *sk,
3580 struct mbuf *m, int off, u_int16_t sport, u_int16_t dport, int *rewrite,
3581 struct pfi_kif *kif, struct pf_state **sm, int tag, u_int16_t bproto_sum,
3582 u_int16_t bip_sum, int hdrlen)
3583 {
3584 struct pf_state *s = NULL;
3585 struct pf_src_node *sn = NULL;
3586 struct tcphdr *th = pd->hdr.tcp;
3587 u_int16_t mss = tcp_mssdflt;
3588 u_short reason;
3589
3590 /* check maximums */
3591 if (r->max_states && (r->states_cur >= r->max_states)) {
3592 pf_status.lcounters[LCNT_STATES]++;
3593 REASON_SET(&reason, PFRES_MAXSTATES);
3594 return (PF_DROP);
3595 }
3596 /* src node for filter rule */
3597 if ((r->rule_flag & PFRULE_SRCTRACK ||
3598 r->rpool.opts & PF_POOL_STICKYADDR) &&
3599 pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) {
3600 REASON_SET(&reason, PFRES_SRCLIMIT);
3601 goto csfailed;
3602 }
3603 /* src node for translation rule */
3604 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3605 pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) {
3606 REASON_SET(&reason, PFRES_SRCLIMIT);
3607 goto csfailed;
3608 }
3609 s = kmalloc(sizeof(struct pf_state), M_PFSTATEPL, M_NOWAIT|M_ZERO);
3610 if (s == NULL) {
3611 REASON_SET(&reason, PFRES_MEMORY);
3612 goto csfailed;
3613 }
3614 s->id = 0; /* XXX Do we really need that? not in OpenBSD */
3615 s->creatorid = 0;
3616 s->rule.ptr = r;
3617 s->nat_rule.ptr = nr;
3618 s->anchor.ptr = a;
3619 STATE_INC_COUNTERS(s);
3620 if (r->allow_opts)
3621 s->state_flags |= PFSTATE_ALLOWOPTS;
3622 if (r->rule_flag & PFRULE_STATESLOPPY)
3623 s->state_flags |= PFSTATE_SLOPPY;
3624 s->log = r->log & PF_LOG_ALL;
3625 if (nr != NULL)
3626 s->log |= nr->log & PF_LOG_ALL;
3627 switch (pd->proto) {
3628 case IPPROTO_TCP:
3629 s->src.seqlo = ntohl(th->th_seq);
3630 s->src.seqhi = s->src.seqlo + pd->p_len + 1;
3631 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
3632 r->keep_state == PF_STATE_MODULATE) {
3633 /* Generate sequence number modulator */
3634 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) ==
3635 0)
3636 s->src.seqdiff = 1;
3637 pf_change_a(&th->th_seq, &th->th_sum,
3638 htonl(s->src.seqlo + s->src.seqdiff), 0);
3639 *rewrite = 1;
3640 } else
3641 s->src.seqdiff = 0;
3642 if (th->th_flags & TH_SYN) {
3643 s->src.seqhi++;
3644 s->src.wscale = pf_get_wscale(m, off,
3645 th->th_off, pd->af);
3646 }
3647 s->src.max_win = MAX(ntohs(th->th_win), 1);
3648 if (s->src.wscale & PF_WSCALE_MASK) {
3649 /* Remove scale factor from initial window */
3650 int win = s->src.max_win;
3651 win += 1 << (s->src.wscale & PF_WSCALE_MASK);
3652 s->src.max_win = (win - 1) >>
3653 (s->src.wscale & PF_WSCALE_MASK);
3654 }
3655 if (th->th_flags & TH_FIN)
3656 s->src.seqhi++;
3657 s->dst.seqhi = 1;
3658 s->dst.max_win = 1;
3659 s->src.state = TCPS_SYN_SENT;
3660 s->dst.state = TCPS_CLOSED;
3661 s->timeout = PFTM_TCP_FIRST_PACKET;
3662 break;
3663 case IPPROTO_UDP:
3664 s->src.state = PFUDPS_SINGLE;
3665 s->dst.state = PFUDPS_NO_TRAFFIC;
3666 s->timeout = PFTM_UDP_FIRST_PACKET;
3667 break;
3668 case IPPROTO_ICMP:
3669 #ifdef INET6
3670 case IPPROTO_ICMPV6:
3671 #endif
3672 s->timeout = PFTM_ICMP_FIRST_PACKET;
3673 break;
3674 default:
3675 s->src.state = PFOTHERS_SINGLE;
3676 s->dst.state = PFOTHERS_NO_TRAFFIC;
3677 s->timeout = PFTM_OTHER_FIRST_PACKET;
3678 }
3679
3680 s->creation = time_second;
3681 s->expire = time_second;
3682
3683 if (sn != NULL) {
3684 s->src_node = sn;
3685 s->src_node->states++;
3686 }
3687 if (nsn != NULL) {
3688 /* XXX We only modify one side for now. */
3689 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af);
3690 s->nat_src_node = nsn;
3691 s->nat_src_node->states++;
3692 }
3693 if (pd->proto == IPPROTO_TCP) {
3694 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
3695 off, pd, th, &s->src, &s->dst)) {
3696 REASON_SET(&reason, PFRES_MEMORY);
3697 pf_src_tree_remove_state(s);
3698 STATE_DEC_COUNTERS(s);
3699 kfree(s, M_PFSTATEPL);
3700 return (PF_DROP);
3701 }
3702 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
3703 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s,
3704 &s->src, &s->dst, rewrite)) {
3705 /* This really shouldn't happen!!! */
3706 DPFPRINTF(PF_DEBUG_URGENT,
3707 ("pf_normalize_tcp_stateful failed on first pkt"));
3708 pf_normalize_tcp_cleanup(s);
3709 pf_src_tree_remove_state(s);
3710 STATE_DEC_COUNTERS(s);
3711 kfree(s, M_PFSTATEPL);
3712 return (PF_DROP);
3713 }
3714 }
3715 s->direction = pd->dir;
3716
3717 if (sk == NULL && pf_state_key_setup(pd, nr, &skw, &sks, &sk, &nk,
3718 pd->src, pd->dst, sport, dport))
3719 goto csfailed;
3720
3721 if (pf_state_insert(BOUND_IFACE(r, kif), skw, sks, s)) {
3722 if (pd->proto == IPPROTO_TCP)
3723 pf_normalize_tcp_cleanup(s);
3724 REASON_SET(&reason, PFRES_STATEINS);
3725 pf_src_tree_remove_state(s);
3726 STATE_DEC_COUNTERS(s);
3727 kfree(s, M_PFSTATEPL);
3728 return (PF_DROP);
3729 } else
3730 *sm = s;
3731
3732 pf_set_rt_ifp(s, pd->src); /* needs s->state_key set */
3733 if (tag > 0) {
3734 pf_tag_ref(tag);
3735 s->tag = tag;
3736 }
3737 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) ==
3738 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) {
3739 s->src.state = PF_TCPS_PROXY_SRC;
3740 /* undo NAT changes, if they have taken place */
3741 if (nr != NULL) {
3742 struct pf_state_key *skt = s->key[PF_SK_WIRE];
3743 if (pd->dir == PF_OUT)
3744 skt = s->key[PF_SK_STACK];
3745 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af);
3746 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af);
3747 if (pd->sport)
3748 *pd->sport = skt->port[pd->sidx];
3749 if (pd->dport)
3750 *pd->dport = skt->port[pd->didx];
3751 if (pd->proto_sum)
3752 *pd->proto_sum = bproto_sum;
3753 if (pd->ip_sum)
3754 *pd->ip_sum = bip_sum;
3755 m_copyback(m, off, hdrlen, pd->hdr.any);
3756 }
3757 s->src.seqhi = htonl(karc4random());
3758 /* Find mss option */
3759 mss = pf_get_mss(m, off, th->th_off, pd->af);
3760 mss = pf_calc_mss(pd->src, pd->af, mss);
3761 mss = pf_calc_mss(pd->dst, pd->af, mss);
3762 s->src.mss = mss;
3763 pf_send_tcp(r, pd->af, pd->dst, pd->src, th->th_dport,
3764 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
3765 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL);
3766 REASON_SET(&reason, PFRES_SYNPROXY);
3767 return (PF_SYNPROXY_DROP);
3768 }
3769
3770 return (PF_PASS);
3771
3772 csfailed:
3773 if (sk != NULL)
3774 kfree(sk, M_PFSTATEKEYPL);
3775 if (nk != NULL)
3776 kfree(nk, M_PFSTATEKEYPL);
3777
3778 if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3779 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3780 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3781 pf_status.src_nodes--;
3782 kfree(sn, M_PFSRCTREEPL);
3783 }
3784 if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0) {
3785 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3786 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3787 pf_status.src_nodes--;
3788 kfree(nsn, M_PFSRCTREEPL);
3789 }
3790 return (PF_DROP);
3791 }
3792
3793 int
3794 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
3795 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
3796 struct pf_ruleset **rsm)
3797 {
3798 struct pf_rule *r, *a = NULL;
3799 struct pf_ruleset *ruleset = NULL;
3800 sa_family_t af = pd->af;
3801 u_short reason;
3802 int tag = -1;
3803 int asd = 0;
3804 int match = 0;
3805
3806 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3807 while (r != NULL) {
3808 r->evaluations++;
3809 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3810 r = r->skip[PF_SKIP_IFP].ptr;
3811 else if (r->direction && r->direction != direction)
3812 r = r->skip[PF_SKIP_DIR].ptr;
3813 else if (r->af && r->af != af)
3814 r = r->skip[PF_SKIP_AF].ptr;
3815 else if (r->proto && r->proto != pd->proto)
3816 r = r->skip[PF_SKIP_PROTO].ptr;
3817 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af,
3818 r->src.neg, kif))
3819 r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3820 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af,
3821 r->dst.neg, NULL))
3822 r = r->skip[PF_SKIP_DST_ADDR].ptr;
3823 else if (r->tos && !(r->tos == pd->tos))
3824 r = TAILQ_NEXT(r, entries);
3825 else if (r->os_fingerprint != PF_OSFP_ANY)
3826 r = TAILQ_NEXT(r, entries);
3827 else if (pd->proto == IPPROTO_UDP &&
3828 (r->src.port_op || r->dst.port_op))
3829 r = TAILQ_NEXT(r, entries);
3830 else if (pd->proto == IPPROTO_TCP &&
3831 (r->src.port_op || r->dst.port_op || r->flagset))
3832 r = TAILQ_NEXT(r, entries);
3833 else if ((pd->proto == IPPROTO_ICMP ||
3834 pd->proto == IPPROTO_ICMPV6) &&
3835 (r->type || r->code))
3836 r = TAILQ_NEXT(r, entries);
3837 else if (r->prob && r->prob <= karc4random())
3838 r = TAILQ_NEXT(r, entries);
3839 else if (r->match_tag && !pf_match_tag(m, r, &tag))
3840 r = TAILQ_NEXT(r, entries);
3841 else {
3842 if (r->anchor == NULL) {
3843 match = 1;
3844 *rm = r;
3845 *am = a;
3846 *rsm = ruleset;
3847 if ((*rm)->quick)
3848 break;
3849 r = TAILQ_NEXT(r, entries);
3850 } else
3851 pf_step_into_anchor(&asd, &ruleset,
3852 PF_RULESET_FILTER, &r, &a, &match);
3853 }
3854 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
3855 PF_RULESET_FILTER, &r, &a, &match))
3856 break;
3857 }
3858 r = *rm;
3859 a = *am;
3860 ruleset = *rsm;
3861
3862 REASON_SET(&reason, PFRES_MATCH);
3863
3864 if (r->log)
3865 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset,
3866 pd);
3867
3868 if (r->action != PF_PASS)
3869 return (PF_DROP);
3870
3871 if (pf_tag_packet(m, tag, -1)) {
3872 REASON_SET(&reason, PFRES_MEMORY);
3873 return (PF_DROP);
3874 }
3875
3876 return (PF_PASS);
3877 }
3878
3879 int
3880 pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst,
3881 struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off,
3882 struct pf_pdesc *pd, u_short *reason, int *copyback)
3883 {
3884 struct tcphdr *th = pd->hdr.tcp;
3885 u_int16_t win = ntohs(th->th_win);
3886 u_int32_t ack, end, seq, orig_seq;
3887 u_int8_t sws, dws;
3888 int ackskew;
3889
3890 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
3891 sws = src->wscale & PF_WSCALE_MASK;
3892 dws = dst->wscale & PF_WSCALE_MASK;
3893 } else
3894 sws = dws = 0;
3895
3896 /*
3897 * Sequence tracking algorithm from Guido van Rooij's paper:
3898 * http://www.madison-gurkha.com/publications/tcp_filtering/
3899 * tcp_filtering.ps
3900 */
3901
3902 orig_seq = seq = ntohl(th->th_seq);
3903 if (src->seqlo == 0) {
3904 /* First packet from this end. Set its state */
3905
3906 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
3907 src->scrub == NULL) {
3908 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
3909 REASON_SET(reason, PFRES_MEMORY);
3910 return (PF_DROP);
3911 }
3912 }
3913
3914 /* Deferred generation of sequence number modulator */
3915 if (dst->seqdiff && !src->seqdiff) {
3916 /* use random iss for the TCP server */
3917 while ((src->seqdiff = karc4random() - seq) == 0)
3918 ;
3919 ack = ntohl(th->th_ack) - dst->seqdiff;
3920 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3921 src->seqdiff), 0);
3922 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3923 *copyback = 1;
3924 } else {
3925 ack = ntohl(th->th_ack);
3926 }
3927
3928 end = seq + pd->p_len;
3929 if (th->th_flags & TH_SYN) {
3930 end++;
3931 (*state)->sync_flags |= PFSTATE_GOT_SYN2;
3932 if (dst->wscale & PF_WSCALE_FLAG) {
3933 src->wscale = pf_get_wscale(m, off, th->th_off,
3934 pd->af);
3935 if (src->wscale & PF_WSCALE_FLAG) {
3936 /* Remove scale factor from initial
3937 * window */
3938 sws = src->wscale & PF_WSCALE_MASK;
3939 win = ((u_int32_t)win + (1 << sws) - 1)
3940 >> sws;
3941 dws = dst->wscale & PF_WSCALE_MASK;
3942 } else {
3943 /* fixup other window */
3944 dst->max_win <<= dst->wscale &
3945 PF_WSCALE_MASK;
3946 /* in case of a retrans SYN|ACK */
3947 dst->wscale = 0;
3948 }
3949 }
3950 }
3951 if (th->th_flags & TH_FIN)
3952 end++;
3953
3954 src->seqlo = seq;
3955 if (src->state < TCPS_SYN_SENT)
3956 src->state = TCPS_SYN_SENT;
3957
3958 /*
3959 * May need to slide the window (seqhi may have been set by
3960 * the crappy stack check or if we picked up the connection
3961 * after establishment)
3962 */
3963 if (src->seqhi == 1 ||
3964 SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
3965 src->seqhi = end + MAX(1, dst->max_win << dws);
3966 if (win > src->max_win)
3967 src->max_win = win;
3968
3969 } else {
3970 ack = ntohl(th->th_ack) - dst->seqdiff;
3971 if (src->seqdiff) {
3972 /* Modulate sequence numbers */
3973 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3974 src->seqdiff), 0);
3975 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3976 *copyback = 1;
3977 }
3978 end = seq + pd->p_len;
3979 if (th->th_flags & TH_SYN)
3980 end++;
3981 if (th->th_flags & TH_FIN)
3982 end++;
3983 }
3984
3985 if ((th->th_flags & TH_ACK) == 0) {
3986 /* Let it pass through the ack skew check */
3987 ack = dst->seqlo;
3988 } else if ((ack == 0 &&
3989 (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
3990 /* broken tcp stacks do not set ack */
3991 (dst->state < TCPS_SYN_SENT)) {
3992 /*
3993 * Many stacks (ours included) will set the ACK number in an
3994 * FIN|ACK if the SYN times out -- no sequence to ACK.
3995 */
3996 ack = dst->seqlo;
3997 }
3998
3999 if (seq == end) {
4000 /* Ease sequencing restrictions on no data packets */
4001 seq = src->seqlo;
4002 end = seq;
4003 }
4004
4005 ackskew = dst->seqlo - ack;
4006
4007
4008 /*
4009 * Need to demodulate the sequence numbers in any TCP SACK options
4010 * (Selective ACK). We could optionally validate the SACK values
4011 * against the current ACK window, either forwards or backwards, but
4012 * I'm not confident that SACK has been implemented properly
4013 * everywhere. It wouldn't surprise me if several stacks accidently
4014 * SACK too far backwards of previously ACKed data. There really aren't
4015 * any security implications of bad SACKing unless the target stack
4016 * doesn't validate the option length correctly. Someone trying to
4017 * spoof into a TCP connection won't bother blindly sending SACK
4018 * options anyway.
4019 */
4020 if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) {
4021 if (pf_modulate_sack(m, off, pd, th, dst))
4022 *copyback = 1;
4023 }
4024
4025
4026 #define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */
4027 if (SEQ_GEQ(src->seqhi, end) &&
4028 /* Last octet inside other's window space */
4029 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
4030 /* Retrans: not more than one window back */
4031 (ackskew >= -MAXACKWINDOW) &&
4032 /* Acking not more than one reassembled fragment backwards */
4033 (ackskew <= (MAXACKWINDOW << sws)) &&
4034 /* Acking not more than one window forward */
4035 ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo ||
4036 (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) ||
4037 (pd->flags & PFDESC_IP_REAS) == 0)) {
4038 /* Require an exact/+1 sequence match on resets when possible */
4039
4040 if (dst->scrub || src->scrub) {
4041 if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4042 *state, src, dst, copyback))
4043 return (PF_DROP);
4044 }
4045
4046 /* update max window */
4047 if (src->max_win < win)
4048 src->max_win = win;
4049 /* synchronize sequencing */
4050 if (SEQ_GT(end, src->seqlo))
4051 src->seqlo = end;
4052 /* slide the window of what the other end can send */
4053 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4054 dst->seqhi = ack + MAX((win << sws), 1);
4055
4056
4057 /* update states */
4058 if (th->th_flags & TH_SYN)
4059 if (src->state < TCPS_SYN_SENT)
4060 src->state = TCPS_SYN_SENT;
4061 if (th->th_flags & TH_FIN)
4062 if (src->state < TCPS_CLOSING)
4063 src->state = TCPS_CLOSING;
4064 if (th->th_flags & TH_ACK) {
4065 if (dst->state == TCPS_SYN_SENT) {
4066 dst->state = TCPS_ESTABLISHED;
4067 if (src->state == TCPS_ESTABLISHED &&
4068 (*state)->src_node != NULL &&
4069 pf_src_connlimit(state)) {
4070 REASON_SET(reason, PFRES_SRCLIMIT);
4071 return (PF_DROP);
4072 }
4073 } else if (dst->state == TCPS_CLOSING)
4074 dst->state = TCPS_FIN_WAIT_2;
4075 }
4076 if (th->th_flags & TH_RST)
4077 src->state = dst->state = TCPS_TIME_WAIT;
4078
4079 /* update expire time */
4080 (*state)->expire = time_second;
4081 if (src->state >= TCPS_FIN_WAIT_2 &&
4082 dst->state >= TCPS_FIN_WAIT_2)
4083 (*state)->timeout = PFTM_TCP_CLOSED;
4084 else if (src->state >= TCPS_CLOSING &&
4085 dst->state >= TCPS_CLOSING)
4086 (*state)->timeout = PFTM_TCP_FIN_WAIT;
4087 else if (src->state < TCPS_ESTABLISHED ||
4088 dst->state < TCPS_ESTABLISHED)
4089 (*state)->timeout = PFTM_TCP_OPENING;
4090 else if (src->state >= TCPS_CLOSING ||
4091 dst->state >= TCPS_CLOSING)
4092 (*state)->timeout = PFTM_TCP_CLOSING;
4093 else
4094 (*state)->timeout = PFTM_TCP_ESTABLISHED;
4095
4096 /* Fall through to PASS packet */
4097
4098 } else if ((dst->state < TCPS_SYN_SENT ||
4099 dst->state >= TCPS_FIN_WAIT_2 ||
4100 src->state >= TCPS_FIN_WAIT_2) &&
4101 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
4102 /* Within a window forward of the originating packet */
4103 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
4104 /* Within a window backward of the originating packet */
4105
4106 /*
4107 * This currently handles three situations:
4108 * 1) Stupid stacks will shotgun SYNs before their peer
4109 * replies.
4110 * 2) When PF catches an already established stream (the
4111 * firewall rebooted, the state table was flushed, routes
4112 * changed...)
4113 * 3) Packets get funky immediately after the connection
4114 * closes (this should catch Solaris spurious ACK|FINs
4115 * that web servers like to spew after a close)
4116 *
4117 * This must be a little more careful than the above code
4118 * since packet floods will also be caught here. We don't
4119 * update the TTL here to mitigate the damage of a packet
4120 * flood and so the same code can handle awkward establishment
4121 * and a loosened connection close.
4122 * In the establishment case, a correct peer response will
4123 * validate the connection, go through the normal state code
4124 * and keep updating the state TTL.
4125 */
4126
4127 if (pf_status.debug >= PF_DEBUG_MISC) {
4128 kprintf("pf: loose state match: ");
4129 pf_print_state(*state);
4130 pf_print_flags(th->th_flags);
4131 kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4132 "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, pd->p_len,
4133 ackskew, (unsigned long long)(*state)->packets[0],
4134 (unsigned long long)(*state)->packets[1],
4135 pd->dir == PF_IN ? "in" : "out",
4136 pd->dir == (*state)->direction ? "fwd" : "rev");
4137 }
4138
4139 if (dst->scrub || src->scrub) {
4140 if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4141 *state, src, dst, copyback))
4142 return (PF_DROP);
4143 }
4144
4145 /* update max window */
4146 if (src->max_win < win)
4147 src->max_win = win;
4148 /* synchronize sequencing */
4149 if (SEQ_GT(end, src->seqlo))
4150 src->seqlo = end;
4151 /* slide the window of what the other end can send */
4152 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4153 dst->seqhi = ack + MAX((win << sws), 1);
4154
4155 /*
4156 * Cannot set dst->seqhi here since this could be a shotgunned
4157 * SYN and not an already established connection.
4158 */
4159
4160 if (th->th_flags & TH_FIN)
4161 if (src->state < TCPS_CLOSING)
4162 src->state = TCPS_CLOSING;
4163 if (th->th_flags & TH_RST)
4164 src->state = dst->state = TCPS_TIME_WAIT;
4165
4166 /* Fall through to PASS packet */
4167
4168 } else if ((*state)->pickup_mode == PF_PICKUPS_HASHONLY ||
4169 ((*state)->pickup_mode == PF_PICKUPS_ENABLED &&
4170 ((*state)->sync_flags & PFSTATE_GOT_SYN_MASK) !=
4171 PFSTATE_GOT_SYN_MASK)) {
4172 /*
4173 * If pickup mode is hash only, do not fail on sequence checks.
4174 *
4175 * If pickup mode is enabled and we did not see the SYN in
4176 * both direction, do not fail on sequence checks because
4177 * we do not have complete information on window scale.
4178 *
4179 * Adjust expiration and fall through to PASS packet.
4180 * XXX Add a FIN check to reduce timeout?
4181 */
4182 (*state)->expire = time_second;
4183 } else {
4184 /*
4185 * Failure processing
4186 */
4187 if ((*state)->dst.state == TCPS_SYN_SENT &&
4188 (*state)->src.state == TCPS_SYN_SENT) {
4189 /* Send RST for state mismatches during handshake */
4190 if (!(th->th_flags & TH_RST))
4191 pf_send_tcp((*state)->rule.ptr, pd->af,
4192 pd->dst, pd->src, th->th_dport,
4193 th->th_sport, ntohl(th->th_ack), 0,
4194 TH_RST, 0, 0,
4195 (*state)->rule.ptr->return_ttl, 1, 0,
4196 pd->eh, kif->pfik_ifp);
4197 src->seqlo = 0;
4198 src->seqhi = 1;
4199 src->max_win = 1;
4200 } else if (pf_status.debug >= PF_DEBUG_MISC) {
4201 kprintf("pf: BAD state: ");
4202 pf_print_state(*state);
4203 pf_print_flags(th->th_flags);
4204 kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4205 "pkts=%llu:%llu dir=%s,%s\n",
4206 seq, orig_seq, ack, pd->p_len, ackskew,
4207 (unsigned long long)(*state)->packets[0],
4208 (unsigned long long)(*state)->packets[1],
4209 pd->dir == PF_IN ? "in" : "out",
4210 pd->dir == (*state)->direction ? "fwd" : "rev");
4211 kprintf("pf: State failure on: %c %c %c %c | %c %c\n",
4212 SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
4213 SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
4214 ' ': '2',
4215 (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
4216 (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
4217 SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
4218 SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
4219 }
4220 REASON_SET(reason, PFRES_BADSTATE);
4221 return (PF_DROP);
4222 }
4223
4224 return (PF_PASS);
4225 }
4226
4227 int
4228 pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst,
4229 struct pf_state **state, struct pf_pdesc *pd, u_short *reason)
4230 {
4231 struct tcphdr *th = pd->hdr.tcp;
4232
4233 if (th->th_flags & TH_SYN)
4234 if (src->state < TCPS_SYN_SENT)
4235 src->state = TCPS_SYN_SENT;
4236 if (th->th_flags & TH_FIN)
4237 if (src->state < TCPS_CLOSING)
4238 src->state = TCPS_CLOSING;
4239 if (th->th_flags & TH_ACK) {
4240 if (dst->state == TCPS_SYN_SENT) {
4241 dst->state = TCPS_ESTABLISHED;
4242 if (src->state == TCPS_ESTABLISHED &&
4243 (*state)->src_node != NULL &&
4244 pf_src_connlimit(state)) {
4245 REASON_SET(reason, PFRES_SRCLIMIT);
4246 return (PF_DROP);
4247 }
4248 } else if (dst->state == TCPS_CLOSING) {
4249 dst->state = TCPS_FIN_WAIT_2;
4250 } else if (src->state == TCPS_SYN_SENT &&
4251 dst->state < TCPS_SYN_SENT) {
4252 /*
4253 * Handle a special sloppy case where we only see one
4254 * half of the connection. If there is a ACK after
4255 * the initial SYN without ever seeing a packet from
4256 * the destination, set the connection to established.
4257 */
4258 dst->state = src->state = TCPS_ESTABLISHED;
4259 if ((*state)->src_node != NULL &&
4260 pf_src_connlimit(state)) {
4261 REASON_SET(reason, PFRES_SRCLIMIT);
4262 return (PF_DROP);
4263 }
4264 } else if (src->state == TCPS_CLOSING &&
4265 dst->state == TCPS_ESTABLISHED &&
4266 dst->seqlo == 0) {
4267 /*
4268 * Handle the closing of half connections where we
4269 * don't see the full bidirectional FIN/ACK+ACK
4270 * handshake.
4271 */
4272 dst->state = TCPS_CLOSING;
4273 }
4274 }
4275 if (th->th_flags & TH_RST)
4276 src->state = dst->state = TCPS_TIME_WAIT;
4277
4278 /* update expire time */
4279 (*state)->expire = time_second;
4280 if (src->state >= TCPS_FIN_WAIT_2 &&
4281 dst->state >= TCPS_FIN_WAIT_2)
4282 (*state)->timeout = PFTM_TCP_CLOSED;
4283 else if (src->state >= TCPS_CLOSING &&
4284 dst->state >= TCPS_CLOSING)
4285 (*state)->timeout = PFTM_TCP_FIN_WAIT;
4286 else if (src->state < TCPS_ESTABLISHED ||
4287 dst->state < TCPS_ESTABLISHED)
4288 (*state)->timeout = PFTM_TCP_OPENING;
4289 else if (src->state >= TCPS_CLOSING ||
4290 dst->state >= TCPS_CLOSING)
4291 (*state)->timeout = PFTM_TCP_CLOSING;
4292 else
4293 (*state)->timeout = PFTM_TCP_ESTABLISHED;
4294
4295 return (PF_PASS);
4296 }
4297
4298 int
4299 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
4300 struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
4301 u_short *reason)
4302 {
4303 struct pf_state_key_cmp key;
4304 struct tcphdr *th = pd->hdr.tcp;
4305 int copyback = 0;
4306 struct pf_state_peer *src, *dst;
4307 struct pf_state_key *sk;
4308
4309 key.af = pd->af;
4310 key.proto = IPPROTO_TCP;
4311 if (direction == PF_IN) { /* wire side, straight */
4312 PF_ACPY(&key.addr[0], pd->src, key.af);
4313 PF_ACPY(&key.addr[1], pd->dst, key.af);
4314 key.port[0] = th->th_sport;
4315 key.port[1] = th->th_dport;
4316 } else { /* stack side, reverse */
4317 PF_ACPY(&key.addr[1], pd->src, key.af);
4318 PF_ACPY(&key.addr[0], pd->dst, key.af);
4319 key.port[1] = th->th_sport;
4320 key.port[0] = th->th_dport;
4321 }
4322
4323 STATE_LOOKUP(kif, &key, direction, *state, m);
4324
4325 if (direction == (*state)->direction) {
4326 src = &(*state)->src;
4327 dst = &(*state)->dst;
4328 } else {
4329 src = &(*state)->dst;
4330 dst = &(*state)->src;
4331 }
4332
4333 sk = (*state)->key[pd->didx];
4334
4335 if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
4336 if (direction != (*state)->direction) {
4337 REASON_SET(reason, PFRES_SYNPROXY);
4338 return (PF_SYNPROXY_DROP);
4339 }
4340 if (th->th_flags & TH_SYN) {
4341 if (ntohl(th->th_seq) != (*state)->src.seqlo) {
4342 REASON_SET(reason, PFRES_SYNPROXY);
4343 return (PF_DROP);
4344 }
4345 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
4346 pd->src, th->th_dport, th->th_sport,
4347 (*state)->src.seqhi, ntohl(th->th_seq) + 1,
4348 TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1,
4349 0, NULL, NULL);
4350 REASON_SET(reason, PFRES_SYNPROXY);
4351 return (PF_SYNPROXY_DROP);
4352 } else if (!(th->th_flags & TH_ACK) ||
4353 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4354 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4355 REASON_SET(reason, PFRES_SYNPROXY);
4356 return (PF_DROP);
4357 } else if ((*state)->src_node != NULL &&
4358 pf_src_connlimit(state)) {
4359 REASON_SET(reason, PFRES_SRCLIMIT);
4360 return (PF_DROP);
4361 } else
4362 (*state)->src.state = PF_TCPS_PROXY_DST;
4363 }
4364 if ((*state)->src.state == PF_TCPS_PROXY_DST) {
4365 if (direction == (*state)->direction) {
4366 if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
4367 (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4368 (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4369 REASON_SET(reason, PFRES_SYNPROXY);
4370 return (PF_DROP);
4371 }
4372 (*state)->src.max_win = MAX(ntohs(th->th_win), 1);
4373 if ((*state)->dst.seqhi == 1)
4374 (*state)->dst.seqhi = htonl(karc4random());
4375 pf_send_tcp((*state)->rule.ptr, pd->af,
4376 &sk->addr[pd->sidx], &sk->addr[pd->didx],
4377 sk->port[pd->sidx], sk->port[pd->didx],
4378 (*state)->dst.seqhi, 0, TH_SYN, 0,
4379 (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL);
4380 REASON_SET(reason, PFRES_SYNPROXY);
4381 return (PF_SYNPROXY_DROP);
4382 } else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
4383 (TH_SYN|TH_ACK)) ||
4384 (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) {
4385 REASON_SET(reason, PFRES_SYNPROXY);
4386 return (PF_DROP);
4387 } else {
4388 (*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
4389 (*state)->dst.seqlo = ntohl(th->th_seq);
4390 pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
4391 pd->src, th->th_dport, th->th_sport,
4392 ntohl(th->th_ack), ntohl(th->th_seq) + 1,
4393 TH_ACK, (*state)->src.max_win, 0, 0, 0,
4394 (*state)->tag, NULL, NULL);
4395 pf_send_tcp((*state)->rule.ptr, pd->af,
4396 &sk->addr[pd->sidx], &sk->addr[pd->didx],
4397 sk->port[pd->sidx], sk->port[pd->didx],
4398 (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
4399 TH_ACK, (*state)->dst.max_win, 0, 0, 1,
4400 0, NULL, NULL);
4401 (*state)->src.seqdiff = (*state)->dst.seqhi -
4402 (*state)->src.seqlo;
4403 (*state)->dst.seqdiff = (*state)->src.seqhi -
4404 (*state)->dst.seqlo;
4405 (*state)->src.seqhi = (*state)->src.seqlo +
4406 (*state)->dst.max_win;
4407 (*state)->dst.seqhi = (*state)->dst.seqlo +
4408 (*state)->src.max_win;
4409 (*state)->src.wscale = (*state)->dst.wscale = 0;
4410 (*state)->src.state = (*state)->dst.state =
4411 TCPS_ESTABLISHED;
4412 REASON_SET(reason, PFRES_SYNPROXY);
4413 return (PF_SYNPROXY_DROP);
4414 }
4415 }
4416
4417 if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) &&
4418 dst->state >= TCPS_FIN_WAIT_2 &&
4419 src->state >= TCPS_FIN_WAIT_2) {
4420 if (pf_status.debug >= PF_DEBUG_MISC) {
4421 kprintf("pf: state reuse ");
4422 pf_print_state(*state);
4423 pf_print_flags(th->th_flags);
4424 kprintf("\n");
4425 }
4426 /* XXX make sure it's the same direction ?? */
4427 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
4428 pf_unlink_state(*state);
4429 *state = NULL;
4430 return (PF_DROP);
4431 }
4432
4433 if ((*state)->state_flags & PFSTATE_SLOPPY) {
4434 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP)
4435 return (PF_DROP);
4436 } else {
4437 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason,
4438 ©back) == PF_DROP)
4439 return (PF_DROP);
4440 }
4441
4442 /* translate source/destination address, if necessary */
4443 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4444 struct pf_state_key *nk = (*state)->key[pd->didx];
4445
4446 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4447 nk->port[pd->sidx] != th->th_sport) {
4448 /*
4449 * The translated source address may be completely
4450 * unrelated to the saved link header, make sure
4451 * a bridge doesn't try to use it.
4452 */
4453 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
4454 m->m_flags &= ~M_HASH;
4455 pf_change_ap(pd->src, &th->th_sport, pd->ip_sum,
4456 &th->th_sum, &nk->addr[pd->sidx],
4457 nk->port[pd->sidx], 0, pd->af);
4458 }
4459
4460 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4461 nk->port[pd->didx] != th->th_dport) {
4462 /*
4463 * If we don't redispatch the packet will go into
4464 * the protocol stack on the wrong cpu for the
4465 * post-translated address.
4466 */
4467 m->m_flags &= ~M_HASH;
4468 pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum,
4469 &th->th_sum, &nk->addr[pd->didx],
4470 nk->port[pd->didx], 0, pd->af);
4471 }
4472 copyback = 1;
4473 }
4474
4475 /* Copyback sequence modulation or stateful scrub changes if needed */
4476 if (copyback)
4477 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4478
4479 return (PF_PASS);
4480 }
4481
4482 int
4483 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
4484 struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4485 {
4486 struct pf_state_peer *src, *dst;
4487 struct pf_state_key_cmp key;
4488 struct udphdr *uh = pd->hdr.udp;
4489
4490 key.af = pd->af;
4491 key.proto = IPPROTO_UDP;
4492 if (direction == PF_IN) { /* wire side, straight */
4493 PF_ACPY(&key.addr[0], pd->src, key.af);
4494 PF_ACPY(&key.addr[1], pd->dst, key.af);
4495 key.port[0] = uh->uh_sport;
4496 key.port[1] = uh->uh_dport;
4497 } else { /* stack side, reverse */
4498 PF_ACPY(&key.addr[1], pd->src, key.af);
4499 PF_ACPY(&key.addr[0], pd->dst, key.af);
4500 key.port[1] = uh->uh_sport;
4501 key.port[0] = uh->uh_dport;
4502 }
4503
4504 STATE_LOOKUP(kif, &key, direction, *state, m);
4505
4506 if (direction == (*state)->direction) {
4507 src = &(*state)->src;
4508 dst = &(*state)->dst;
4509 } else {
4510 src = &(*state)->dst;
4511 dst = &(*state)->src;
4512 }
4513
4514 /* update states */
4515 if (src->state < PFUDPS_SINGLE)
4516 src->state = PFUDPS_SINGLE;
4517 if (dst->state == PFUDPS_SINGLE)
4518 dst->state = PFUDPS_MULTIPLE;
4519
4520 /* update expire time */
4521 (*state)->expire = time_second;
4522 if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
4523 (*state)->timeout = PFTM_UDP_MULTIPLE;
4524 else
4525 (*state)->timeout = PFTM_UDP_SINGLE;
4526
4527 /* translate source/destination address, if necessary */
4528 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4529 struct pf_state_key *nk = (*state)->key[pd->didx];
4530
4531 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4532 nk->port[pd->sidx] != uh->uh_sport) {
4533 /*
4534 * The translated source address may be completely
4535 * unrelated to the saved link header, make sure
4536 * a bridge doesn't try to use it.
4537 */
4538 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
4539 m->m_flags &= ~M_HASH;
4540 pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum,
4541 &uh->uh_sum, &nk->addr[pd->sidx],
4542 nk->port[pd->sidx], 1, pd->af);
4543 }
4544
4545 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4546 nk->port[pd->didx] != uh->uh_dport) {
4547 /*
4548 * If we don't redispatch the packet will go into
4549 * the protocol stack on the wrong cpu for the
4550 * post-translated address.
4551 */
4552 m->m_flags &= ~M_HASH;
4553 pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum,
4554 &uh->uh_sum, &nk->addr[pd->didx],
4555 nk->port[pd->didx], 1, pd->af);
4556 }
4557 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
4558 }
4559
4560 return (PF_PASS);
4561 }
4562
4563 int
4564 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
4565 struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason)
4566 {
4567 struct pf_addr *saddr = pd->src, *daddr = pd->dst;
4568 u_int16_t icmpid = 0, *icmpsum;
4569 u_int8_t icmptype;
4570 int state_icmp = 0;
4571 struct pf_state_key_cmp key;
4572
4573 switch (pd->proto) {
4574 #ifdef INET
4575 case IPPROTO_ICMP:
4576 icmptype = pd->hdr.icmp->icmp_type;
4577 icmpid = pd->hdr.icmp->icmp_id;
4578 icmpsum = &pd->hdr.icmp->icmp_cksum;
4579
4580 if (icmptype == ICMP_UNREACH ||
4581 icmptype == ICMP_SOURCEQUENCH ||
4582 icmptype == ICMP_REDIRECT ||
4583 icmptype == ICMP_TIMXCEED ||
4584 icmptype == ICMP_PARAMPROB)
4585 state_icmp++;
4586 break;
4587 #endif /* INET */
4588 #ifdef INET6
4589 case IPPROTO_ICMPV6:
4590 icmptype = pd->hdr.icmp6->icmp6_type;
4591 icmpid = pd->hdr.icmp6->icmp6_id;
4592 icmpsum = &pd->hdr.icmp6->icmp6_cksum;
4593
4594 if (icmptype == ICMP6_DST_UNREACH ||
4595 icmptype == ICMP6_PACKET_TOO_BIG ||
4596 icmptype == ICMP6_TIME_EXCEEDED ||
4597 icmptype == ICMP6_PARAM_PROB)
4598 state_icmp++;
4599 break;
4600 #endif /* INET6 */
4601 }
4602
4603 if (!state_icmp) {
4604
4605 /*
4606 * ICMP query/reply message not related to a TCP/UDP packet.
4607 * Search for an ICMP state.
4608 */
4609 key.af = pd->af;
4610 key.proto = pd->proto;
4611 key.port[0] = key.port[1] = icmpid;
4612 if (direction == PF_IN) { /* wire side, straight */
4613 PF_ACPY(&key.addr[0], pd->src, key.af);
4614 PF_ACPY(&key.addr[1], pd->dst, key.af);
4615 } else { /* stack side, reverse */
4616 PF_ACPY(&key.addr[1], pd->src, key.af);
4617 PF_ACPY(&key.addr[0], pd->dst, key.af);
4618 }
4619
4620 STATE_LOOKUP(kif, &key, direction, *state, m);
4621
4622 (*state)->expire = time_second;
4623 (*state)->timeout = PFTM_ICMP_ERROR_REPLY;
4624
4625 /* translate source/destination address, if necessary */
4626 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4627 struct pf_state_key *nk = (*state)->key[pd->didx];
4628
4629 switch (pd->af) {
4630 #ifdef INET
4631 case AF_INET:
4632 if (PF_ANEQ(pd->src,
4633 &nk->addr[pd->sidx], AF_INET))
4634 pf_change_a(&saddr->v4.s_addr,
4635 pd->ip_sum,
4636 nk->addr[pd->sidx].v4.s_addr, 0);
4637
4638 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx],
4639 AF_INET))
4640 pf_change_a(&daddr->v4.s_addr,
4641 pd->ip_sum,
4642 nk->addr[pd->didx].v4.s_addr, 0);
4643
4644 if (nk->port[0] !=
4645 pd->hdr.icmp->icmp_id) {
4646 pd->hdr.icmp->icmp_cksum =
4647 pf_cksum_fixup(
4648 pd->hdr.icmp->icmp_cksum, icmpid,
4649 nk->port[pd->sidx], 0);
4650 pd->hdr.icmp->icmp_id =
4651 nk->port[pd->sidx];
4652 }
4653
4654 m_copyback(m, off, ICMP_MINLEN,
4655 (caddr_t)pd->hdr.icmp);
4656 break;
4657 #endif /* INET */
4658 #ifdef INET6
4659 case AF_INET6:
4660 if (PF_ANEQ(pd->src,
4661 &nk->addr[pd->sidx], AF_INET6))
4662 pf_change_a6(saddr,
4663 &pd->hdr.icmp6->icmp6_cksum,
4664 &nk->addr[pd->sidx], 0);
4665
4666 if (PF_ANEQ(pd->dst,
4667 &nk->addr[pd->didx], AF_INET6))
4668 pf_change_a6(daddr,
4669 &pd->hdr.icmp6->icmp6_cksum,
4670 &nk->addr[pd->didx], 0);
4671
4672 m_copyback(m, off,
4673 sizeof(struct icmp6_hdr),
4674 (caddr_t)pd->hdr.icmp6);
4675 break;
4676 #endif /* INET6 */
4677 }
4678 }
4679 return (PF_PASS);
4680
4681 } else {
4682 /*
4683 * ICMP error message in response to a TCP/UDP packet.
4684 * Extract the inner TCP/UDP header and search for that state.
4685 */
4686
4687 struct pf_pdesc pd2;
4688 #ifdef INET
4689 struct ip h2;
4690 #endif /* INET */
4691 #ifdef INET6
4692 struct ip6_hdr h2_6;
4693 int terminal = 0;
4694 #endif /* INET6 */
4695 int ipoff2;
4696 int off2;
4697
4698 pd2.af = pd->af;
4699 /* Payload packet is from the opposite direction. */
4700 pd2.sidx = (direction == PF_IN) ? 1 : 0;
4701 pd2.didx = (direction == PF_IN) ? 0 : 1;
4702 switch (pd->af) {
4703 #ifdef INET
4704 case AF_INET:
4705 /* offset of h2 in mbuf chain */
4706 ipoff2 = off + ICMP_MINLEN;
4707
4708 if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
4709 NULL, reason, pd2.af)) {
4710 DPFPRINTF(PF_DEBUG_MISC,
4711 ("pf: ICMP error message too short "
4712 "(ip)\n"));
4713 return (PF_DROP);
4714 }
4715 /*
4716 * ICMP error messages don't refer to non-first
4717 * fragments
4718 */
4719 if (h2.ip_off & htons(IP_OFFMASK)) {
4720 REASON_SET(reason, PFRES_FRAG);
4721 return (PF_DROP);
4722 }
4723
4724 /* offset of protocol header that follows h2 */
4725 off2 = ipoff2 + (h2.ip_hl << 2);
4726
4727 pd2.proto = h2.ip_p;
4728 pd2.src = (struct pf_addr *)&h2.ip_src;
4729 pd2.dst = (struct pf_addr *)&h2.ip_dst;
4730 pd2.ip_sum = &h2.ip_sum;
4731 break;
4732 #endif /* INET */
4733 #ifdef INET6
4734 case AF_INET6:
4735 ipoff2 = off + sizeof(struct icmp6_hdr);
4736
4737 if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
4738 NULL, reason, pd2.af)) {
4739 DPFPRINTF(PF_DEBUG_MISC,
4740 ("pf: ICMP error message too short "
4741 "(ip6)\n"));
4742 return (PF_DROP);
4743 }
4744 pd2.proto = h2_6.ip6_nxt;
4745 pd2.src = (struct pf_addr *)&h2_6.ip6_src;
4746 pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
4747 pd2.ip_sum = NULL;
4748 off2 = ipoff2 + sizeof(h2_6);
4749 do {
4750 switch (pd2.proto) {
4751 case IPPROTO_FRAGMENT:
4752 /*
4753 * ICMPv6 error messages for
4754 * non-first fragments
4755 */
4756 REASON_SET(reason, PFRES_FRAG);
4757 return (PF_DROP);
4758 case IPPROTO_AH:
4759 case IPPROTO_HOPOPTS:
4760 case IPPROTO_ROUTING:
4761 case IPPROTO_DSTOPTS: {
4762 /* get next header and header length */
4763 struct ip6_ext opt6;
4764
4765 if (!pf_pull_hdr(m, off2, &opt6,
4766 sizeof(opt6), NULL, reason,
4767 pd2.af)) {
4768 DPFPRINTF(PF_DEBUG_MISC,
4769 ("pf: ICMPv6 short opt\n"));
4770 return (PF_DROP);
4771 }
4772 if (pd2.proto == IPPROTO_AH)
4773 off2 += (opt6.ip6e_len + 2) * 4;
4774 else
4775 off2 += (opt6.ip6e_len + 1) * 8;
4776 pd2.proto = opt6.ip6e_nxt;
4777 /* goto the next header */
4778 break;
4779 }
4780 default:
4781 terminal++;
4782 break;
4783 }
4784 } while (!terminal);
4785 break;
4786 #endif /* INET6 */
4787 default:
4788 DPFPRINTF(PF_DEBUG_MISC,
4789 ("pf: ICMP AF %d unknown (ip6)\n", pd->af));
4790 return (PF_DROP);
4791 break;
4792 }
4793
4794 switch (pd2.proto) {
4795 case IPPROTO_TCP: {
4796 struct tcphdr th;
4797 u_int32_t seq;
4798 struct pf_state_peer *src, *dst;
4799 u_int8_t dws;
4800 int copyback = 0;
4801
4802 /*
4803 * Only the first 8 bytes of the TCP header can be
4804 * expected. Don't access any TCP header fields after
4805 * th_seq, an ackskew test is not possible.
4806 */
4807 if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason,
4808 pd2.af)) {
4809 DPFPRINTF(PF_DEBUG_MISC,
4810 ("pf: ICMP error message too short "
4811 "(tcp)\n"));
4812 return (PF_DROP);
4813 }
4814
4815 key.af = pd2.af;
4816 key.proto = IPPROTO_TCP;
4817 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4818 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4819 key.port[pd2.sidx] = th.th_sport;
4820 key.port[pd2.didx] = th.th_dport;
4821
4822 STATE_LOOKUP(kif, &key, direction, *state, m);
4823
4824 if (direction == (*state)->direction) {
4825 src = &(*state)->dst;
4826 dst = &(*state)->src;
4827 } else {
4828 src = &(*state)->src;
4829 dst = &(*state)->dst;
4830 }
4831
4832 if (src->wscale && dst->wscale)
4833 dws = dst->wscale & PF_WSCALE_MASK;
4834 else
4835 dws = 0;
4836
4837 /* Demodulate sequence number */
4838 seq = ntohl(th.th_seq) - src->seqdiff;
4839 if (src->seqdiff) {
4840 pf_change_a(&th.th_seq, icmpsum,
4841 htonl(seq), 0);
4842 copyback = 1;
4843 }
4844
4845 if (!((*state)->state_flags & PFSTATE_SLOPPY) &&
4846 (!SEQ_GEQ(src->seqhi, seq) ||
4847 !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) {
4848 if (pf_status.debug >= PF_DEBUG_MISC) {
4849 kprintf("pf: BAD ICMP %d:%d ",
4850 icmptype, pd->hdr.icmp->icmp_code);
4851 pf_print_host(pd->src, 0, pd->af);
4852 kprintf(" -> ");
4853 pf_print_host(pd->dst, 0, pd->af);
4854 kprintf(" state: ");
4855 pf_print_state(*state);
4856 kprintf(" seq=%u\n", seq);
4857 }
4858 REASON_SET(reason, PFRES_BADSTATE);
4859 return (PF_DROP);
4860 } else {
4861 if (pf_status.debug >= PF_DEBUG_MISC) {
4862 kprintf("pf: OK ICMP %d:%d ",
4863 icmptype, pd->hdr.icmp->icmp_code);
4864 pf_print_host(pd->src, 0, pd->af);
4865 kprintf(" -> ");
4866 pf_print_host(pd->dst, 0, pd->af);
4867 kprintf(" state: ");
4868 pf_print_state(*state);
4869 kprintf(" seq=%u\n", seq);
4870 }
4871 }
4872
4873 /* translate source/destination address, if necessary */
4874 if ((*state)->key[PF_SK_WIRE] !=
4875 (*state)->key[PF_SK_STACK]) {
4876 struct pf_state_key *nk =
4877 (*state)->key[pd->didx];
4878
4879 if (PF_ANEQ(pd2.src,
4880 &nk->addr[pd2.sidx], pd2.af) ||
4881 nk->port[pd2.sidx] != th.th_sport)
4882 pf_change_icmp(pd2.src, &th.th_sport,
4883 daddr, &nk->addr[pd2.sidx],
4884 nk->port[pd2.sidx], NULL,
4885 pd2.ip_sum, icmpsum,
4886 pd->ip_sum, 0, pd2.af);
4887
4888 if (PF_ANEQ(pd2.dst,
4889 &nk->addr[pd2.didx], pd2.af) ||
4890 nk->port[pd2.didx] != th.th_dport)
4891 pf_change_icmp(pd2.dst, &th.th_dport,
4892 NULL, /* XXX Inbound NAT? */
4893 &nk->addr[pd2.didx],
4894 nk->port[pd2.didx], NULL,
4895 pd2.ip_sum, icmpsum,
4896 pd->ip_sum, 0, pd2.af);
4897 copyback = 1;
4898 }
4899
4900 if (copyback) {
4901 switch (pd2.af) {
4902 #ifdef INET
4903 case AF_INET:
4904 m_copyback(m, off, ICMP_MINLEN,
4905 (caddr_t)pd->hdr.icmp);
4906 m_copyback(m, ipoff2, sizeof(h2),
4907 (caddr_t)&h2);
4908 break;
4909 #endif /* INET */
4910 #ifdef INET6
4911 case AF_INET6:
4912 m_copyback(m, off,
4913 sizeof(struct icmp6_hdr),
4914 (caddr_t)pd->hdr.icmp6);
4915 m_copyback(m, ipoff2, sizeof(h2_6),
4916 (caddr_t)&h2_6);
4917 break;
4918 #endif /* INET6 */
4919 }
4920 m_copyback(m, off2, 8, (caddr_t)&th);
4921 }
4922
4923 return (PF_PASS);
4924 break;
4925 }
4926 case IPPROTO_UDP: {
4927 struct udphdr uh;
4928
4929 if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
4930 NULL, reason, pd2.af)) {
4931 DPFPRINTF(PF_DEBUG_MISC,
4932 ("pf: ICMP error message too short "
4933 "(udp)\n"));
4934 return (PF_DROP);
4935 }
4936
4937 key.af = pd2.af;
4938 key.proto = IPPROTO_UDP;
4939 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4940 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4941 key.port[pd2.sidx] = uh.uh_sport;
4942 key.port[pd2.didx] = uh.uh_dport;
4943
4944 STATE_LOOKUP(kif, &key, direction, *state, m);
4945
4946 /* translate source/destination address, if necessary */
4947 if ((*state)->key[PF_SK_WIRE] !=
4948 (*state)->key[PF_SK_STACK]) {
4949 struct pf_state_key *nk =
4950 (*state)->key[pd->didx];
4951
4952 if (PF_ANEQ(pd2.src,
4953 &nk->addr[pd2.sidx], pd2.af) ||
4954 nk->port[pd2.sidx] != uh.uh_sport)
4955 pf_change_icmp(pd2.src, &uh.uh_sport,
4956 daddr, &nk->addr[pd2.sidx],
4957 nk->port[pd2.sidx], &uh.uh_sum,
4958 pd2.ip_sum, icmpsum,
4959 pd->ip_sum, 1, pd2.af);
4960
4961 if (PF_ANEQ(pd2.dst,
4962 &nk->addr[pd2.didx], pd2.af) ||
4963 nk->port[pd2.didx] != uh.uh_dport)
4964 pf_change_icmp(pd2.dst, &uh.uh_dport,
4965 NULL, /* XXX Inbound NAT? */
4966 &nk->addr[pd2.didx],
4967 nk->port[pd2.didx], &uh.uh_sum,
4968 pd2.ip_sum, icmpsum,
4969 pd->ip_sum, 1, pd2.af);
4970
4971 switch (pd2.af) {
4972 #ifdef INET
4973 case AF_INET:
4974 m_copyback(m, off, ICMP_MINLEN,
4975 (caddr_t)pd->hdr.icmp);
4976 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4977 break;
4978 #endif /* INET */
4979 #ifdef INET6
4980 case AF_INET6:
4981 m_copyback(m, off,
4982 sizeof(struct icmp6_hdr),
4983 (caddr_t)pd->hdr.icmp6);
4984 m_copyback(m, ipoff2, sizeof(h2_6),
4985 (caddr_t)&h2_6);
4986 break;
4987 #endif /* INET6 */
4988 }
4989 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh);
4990 }
4991
4992 return (PF_PASS);
4993 break;
4994 }
4995 #ifdef INET
4996 case IPPROTO_ICMP: {
4997 struct icmp iih;
4998
4999 if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
5000 NULL, reason, pd2.af)) {
5001 DPFPRINTF(PF_DEBUG_MISC,
5002 ("pf: ICMP error message too short i"
5003 "(icmp)\n"));
5004 return (PF_DROP);
5005 }
5006
5007 key.af = pd2.af;
5008 key.proto = IPPROTO_ICMP;
5009 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5010 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5011 key.port[0] = key.port[1] = iih.icmp_id;
5012
5013 STATE_LOOKUP(kif, &key, direction, *state, m);
5014
5015 /* translate source/destination address, if necessary */
5016 if ((*state)->key[PF_SK_WIRE] !=
5017 (*state)->key[PF_SK_STACK]) {
5018 struct pf_state_key *nk =
5019 (*state)->key[pd->didx];
5020
5021 if (PF_ANEQ(pd2.src,
5022 &nk->addr[pd2.sidx], pd2.af) ||
5023 nk->port[pd2.sidx] != iih.icmp_id)
5024 pf_change_icmp(pd2.src, &iih.icmp_id,
5025 daddr, &nk->addr[pd2.sidx],
5026 nk->port[pd2.sidx], NULL,
5027 pd2.ip_sum, icmpsum,
5028 pd->ip_sum, 0, AF_INET);
5029
5030 if (PF_ANEQ(pd2.dst,
5031 &nk->addr[pd2.didx], pd2.af) ||
5032 nk->port[pd2.didx] != iih.icmp_id)
5033 pf_change_icmp(pd2.dst, &iih.icmp_id,
5034 NULL, /* XXX Inbound NAT? */
5035 &nk->addr[pd2.didx],
5036 nk->port[pd2.didx], NULL,
5037 pd2.ip_sum, icmpsum,
5038 pd->ip_sum, 0, AF_INET);
5039
5040 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
5041 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5042 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih);
5043 }
5044 return (PF_PASS);
5045 break;
5046 }
5047 #endif /* INET */
5048 #ifdef INET6
5049 case IPPROTO_ICMPV6: {
5050 struct icmp6_hdr iih;
5051
5052 if (!pf_pull_hdr(m, off2, &iih,
5053 sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) {
5054 DPFPRINTF(PF_DEBUG_MISC,
5055 ("pf: ICMP error message too short "
5056 "(icmp6)\n"));
5057 return (PF_DROP);
5058 }
5059
5060 key.af = pd2.af;
5061 key.proto = IPPROTO_ICMPV6;
5062 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5063 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5064 key.port[0] = key.port[1] = iih.icmp6_id;
5065
5066 STATE_LOOKUP(kif, &key, direction, *state, m);
5067
5068 /* translate source/destination address, if necessary */
5069 if ((*state)->key[PF_SK_WIRE] !=
5070 (*state)->key[PF_SK_STACK]) {
5071 struct pf_state_key *nk =
5072 (*state)->key[pd->didx];
5073
5074 if (PF_ANEQ(pd2.src,
5075 &nk->addr[pd2.sidx], pd2.af) ||
5076 nk->port[pd2.sidx] != iih.icmp6_id)
5077 pf_change_icmp(pd2.src, &iih.icmp6_id,
5078 daddr, &nk->addr[pd2.sidx],
5079 nk->port[pd2.sidx], NULL,
5080 pd2.ip_sum, icmpsum,
5081 pd->ip_sum, 0, AF_INET6);
5082
5083 if (PF_ANEQ(pd2.dst,
5084 &nk->addr[pd2.didx], pd2.af) ||
5085 nk->port[pd2.didx] != iih.icmp6_id)
5086 pf_change_icmp(pd2.dst, &iih.icmp6_id,
5087 NULL, /* XXX Inbound NAT? */
5088 &nk->addr[pd2.didx],
5089 nk->port[pd2.didx], NULL,
5090 pd2.ip_sum, icmpsum,
5091 pd->ip_sum, 0, AF_INET6);
5092
5093 m_copyback(m, off, sizeof(struct icmp6_hdr),
5094 (caddr_t)pd->hdr.icmp6);
5095 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6);
5096 m_copyback(m, off2, sizeof(struct icmp6_hdr),
5097 (caddr_t)&iih);
5098 }
5099
5100 return (PF_PASS);
5101 break;
5102 }
5103 #endif /* INET6 */
5104 default: {
5105 key.af = pd2.af;
5106 key.proto = pd2.proto;
5107 PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5108 PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5109 key.port[0] = key.port[1] = 0;
5110
5111 STATE_LOOKUP(kif, &key, direction, *state, m);
5112
5113 /* translate source/destination address, if necessary */
5114 if ((*state)->key[PF_SK_WIRE] !=
5115 (*state)->key[PF_SK_STACK]) {
5116 struct pf_state_key *nk =
5117 (*state)->key[pd->didx];
5118
5119 if (PF_ANEQ(pd2.src,
5120 &nk->addr[pd2.sidx], pd2.af))
5121 pf_change_icmp(pd2.src, NULL, daddr,
5122 &nk->addr[pd2.sidx], 0, NULL,
5123 pd2.ip_sum, icmpsum,
5124 pd->ip_sum, 0, pd2.af);
5125
5126 if (PF_ANEQ(pd2.dst,
5127 &nk->addr[pd2.didx], pd2.af))
5128 pf_change_icmp(pd2.src, NULL,
5129 NULL, /* XXX Inbound NAT? */
5130 &nk->addr[pd2.didx], 0, NULL,
5131 pd2.ip_sum, icmpsum,
5132 pd->ip_sum, 0, pd2.af);
5133
5134 switch (pd2.af) {
5135 #ifdef INET
5136 case AF_INET:
5137 m_copyback(m, off, ICMP_MINLEN,
5138 (caddr_t)pd->hdr.icmp);
5139 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5140 break;
5141 #endif /* INET */
5142 #ifdef INET6
5143 case AF_INET6:
5144 m_copyback(m, off,
5145 sizeof(struct icmp6_hdr),
5146 (caddr_t)pd->hdr.icmp6);
5147 m_copyback(m, ipoff2, sizeof(h2_6),
5148 (caddr_t)&h2_6);
5149 break;
5150 #endif /* INET6 */
5151 }
5152 }
5153 return (PF_PASS);
5154 break;
5155 }
5156 }
5157 }
5158 }
5159
5160 int
5161 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
5162 struct mbuf *m, struct pf_pdesc *pd)
5163 {
5164 struct pf_state_peer *src, *dst;
5165 struct pf_state_key_cmp key;
5166
5167 key.af = pd->af;
5168 key.proto = pd->proto;
5169 if (direction == PF_IN) {
5170 PF_ACPY(&key.addr[0], pd->src, key.af);
5171 PF_ACPY(&key.addr[1], pd->dst, key.af);
5172 key.port[0] = key.port[1] = 0;
5173 } else {
5174 PF_ACPY(&key.addr[1], pd->src, key.af);
5175 PF_ACPY(&key.addr[0], pd->dst, key.af);
5176 key.port[1] = key.port[0] = 0;
5177 }
5178
5179 STATE_LOOKUP(kif, &key, direction, *state, m);
5180
5181 if (direction == (*state)->direction) {
5182 src = &(*state)->src;
5183 dst = &(*state)->dst;
5184 } else {
5185 src = &(*state)->dst;
5186 dst = &(*state)->src;
5187 }
5188
5189 /* update states */
5190 if (src->state < PFOTHERS_SINGLE)
5191 src->state = PFOTHERS_SINGLE;
5192 if (dst->state == PFOTHERS_SINGLE)
5193 dst->state = PFOTHERS_MULTIPLE;
5194
5195 /* update expire time */
5196 (*state)->expire = time_second;
5197 if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
5198 (*state)->timeout = PFTM_OTHER_MULTIPLE;
5199 else
5200 (*state)->timeout = PFTM_OTHER_SINGLE;
5201
5202 /* translate source/destination address, if necessary */
5203 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
5204 struct pf_state_key *nk = (*state)->key[pd->didx];
5205
5206 KKASSERT(nk);
5207 KKASSERT(pd);
5208 KKASSERT(pd->src);
5209 KKASSERT(pd->dst);
5210 switch (pd->af) {
5211 #ifdef INET
5212 case AF_INET:
5213 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
5214 pf_change_a(&pd->src->v4.s_addr,
5215 pd->ip_sum,
5216 nk->addr[pd->sidx].v4.s_addr,
5217 0);
5218
5219
5220 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5221 pf_change_a(&pd->dst->v4.s_addr,
5222 pd->ip_sum,
5223 nk->addr[pd->didx].v4.s_addr,
5224 0);
5225
5226 break;
5227 #endif /* INET */
5228 #ifdef INET6
5229 case AF_INET6:
5230 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
5231 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af);
5232
5233 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5234 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af);
5235 #endif /* INET6 */
5236 }
5237 }
5238 return (PF_PASS);
5239 }
5240
5241 /*
5242 * ipoff and off are measured from the start of the mbuf chain.
5243 * h must be at "ipoff" on the mbuf chain.
5244 */
5245 void *
5246 pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
5247 u_short *actionp, u_short *reasonp, sa_family_t af)
5248 {
5249 switch (af) {
5250 #ifdef INET
5251 case AF_INET: {
5252 struct ip *h = mtod(m, struct ip *);
5253 u_int16_t fragoff = (h->ip_off & IP_OFFMASK) << 3;
5254
5255 if (fragoff) {
5256 if (fragoff >= len)
5257 ACTION_SET(actionp, PF_PASS);
5258 else {
5259 ACTION_SET(actionp, PF_DROP);
5260 REASON_SET(reasonp, PFRES_FRAG);
5261 }
5262 return (NULL);
5263 }
5264 if (m->m_pkthdr.len < off + len ||
5265 h->ip_len < off + len) {
5266 ACTION_SET(actionp, PF_DROP);
5267 REASON_SET(reasonp, PFRES_SHORT);
5268 return (NULL);
5269 }
5270 break;
5271 }
5272 #endif /* INET */
5273 #ifdef INET6
5274 case AF_INET6: {
5275 struct ip6_hdr *h = mtod(m, struct ip6_hdr *);
5276
5277 if (m->m_pkthdr.len < off + len ||
5278 (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
5279 (unsigned)(off + len)) {
5280 ACTION_SET(actionp, PF_DROP);
5281 REASON_SET(reasonp, PFRES_SHORT);
5282 return (NULL);
5283 }
5284 break;
5285 }
5286 #endif /* INET6 */
5287 }
5288 m_copydata(m, off, len, p);
5289 return (p);
5290 }
5291
5292 int
5293 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif)
5294 {
5295 struct sockaddr_in *dst;
5296 int ret = 1;
5297 int check_mpath;
5298 #ifdef INET6
5299 struct sockaddr_in6 *dst6;
5300 struct route_in6 ro;
5301 #else
5302 struct route ro;
5303 #endif
5304 struct radix_node *rn;
5305 struct rtentry *rt;
5306 struct ifnet *ifp;
5307
5308 check_mpath = 0;
5309 bzero(&ro, sizeof(ro));
5310 switch (af) {
5311 case AF_INET:
5312 dst = satosin(&ro.ro_dst);
5313 dst->sin_family = AF_INET;
5314 dst->sin_len = sizeof(*dst);
5315 dst->sin_addr = addr->v4;
5316 break;
5317 #ifdef INET6
5318 case AF_INET6:
5319 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
5320 dst6->sin6_family = AF_INET6;
5321 dst6->sin6_len = sizeof(*dst6);
5322 dst6->sin6_addr = addr->v6;
5323 break;
5324 #endif /* INET6 */
5325 default:
5326 return (0);
5327 }
5328
5329 /* Skip checks for ipsec interfaces */
5330 if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
5331 goto out;
5332
5333 rtalloc_ign((struct route *)&ro, 0);
5334
5335 if (ro.ro_rt != NULL) {
5336 /* No interface given, this is a no-route check */
5337 if (kif == NULL)
5338 goto out;
5339
5340 if (kif->pfik_ifp == NULL) {
5341 ret = 0;
5342 goto out;
5343 }
5344
5345 /* Perform uRPF check if passed input interface */
5346 ret = 0;
5347 rn = (struct radix_node *)ro.ro_rt;
5348 do {
5349 rt = (struct rtentry *)rn;
5350 ifp = rt->rt_ifp;
5351
5352 if (kif->pfik_ifp == ifp)
5353 ret = 1;
5354 rn = NULL;
5355 } while (check_mpath == 1 && rn != NULL && ret == 0);
5356 } else
5357 ret = 0;
5358 out:
5359 if (ro.ro_rt != NULL)
5360 RTFREE(ro.ro_rt);
5361 return (ret);
5362 }
5363
5364 int
5365 pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw)
5366 {
5367 struct sockaddr_in *dst;
5368 #ifdef INET6
5369 struct sockaddr_in6 *dst6;
5370 struct route_in6 ro;
5371 #else
5372 struct route ro;
5373 #endif
5374 int ret = 0;
5375
5376 ASSERT_LWKT_TOKEN_HELD(&pf_token);
5377
5378 bzero(&ro, sizeof(ro));
5379 switch (af) {
5380 case AF_INET:
5381 dst = satosin(&ro.ro_dst);
5382 dst->sin_family = AF_INET;
5383 dst->sin_len = sizeof(*dst);
5384 dst->sin_addr = addr->v4;
5385 break;
5386 #ifdef INET6
5387 case AF_INET6:
5388 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
5389 dst6->sin6_family = AF_INET6;
5390 dst6->sin6_len = sizeof(*dst6);
5391 dst6->sin6_addr = addr->v6;
5392 break;
5393 #endif /* INET6 */
5394 default:
5395 return (0);
5396 }
5397
5398 rtalloc_ign((struct route *)&ro, (RTF_CLONING | RTF_PRCLONING));
5399
5400 if (ro.ro_rt != NULL) {
5401 RTFREE(ro.ro_rt);
5402 }
5403
5404 return (ret);
5405 }
5406
5407 #ifdef INET
5408 void
5409 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5410 struct pf_state *s, struct pf_pdesc *pd)
5411 {
5412 struct mbuf *m0, *m1;
5413 struct route iproute;
5414 struct route *ro = NULL;
5415 struct sockaddr_in *dst;
5416 struct ip *ip;
5417 struct ifnet *ifp = NULL;
5418 struct pf_addr naddr;
5419 struct pf_src_node *sn = NULL;
5420 int error = 0;
5421 int sw_csum;
5422 #ifdef IPSEC
5423 struct m_tag *mtag;
5424 #endif /* IPSEC */
5425
5426 ASSERT_LWKT_TOKEN_HELD(&pf_token);
5427
5428 if (m == NULL || *m == NULL || r == NULL ||
5429 (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
5430 panic("pf_route: invalid parameters");
5431
5432 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
5433 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
5434 (*m)->m_pkthdr.pf.routed = 1;
5435 } else {
5436 if ((*m)->m_pkthdr.pf.routed++ > 3) {
5437 m0 = *m;
5438 *m = NULL;
5439 goto bad;
5440 }
5441 }
5442
5443 if (r->rt == PF_DUPTO) {
5444 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL) {
5445 return;
5446 }
5447 } else {
5448 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) {
5449 return;
5450 }
5451 m0 = *m;
5452 }
5453
5454 if (m0->m_len < sizeof(struct ip)) {
5455 DPFPRINTF(PF_DEBUG_URGENT,
5456 ("pf_route: m0->m_len < sizeof(struct ip)\n"));
5457 goto bad;
5458 }
5459
5460 ip = mtod(m0, struct ip *);
5461
5462 ro = &iproute;
5463 bzero((caddr_t)ro, sizeof(*ro));
5464 dst = satosin(&ro->ro_dst);
5465 dst->sin_family = AF_INET;
5466 dst->sin_len = sizeof(*dst);
5467 dst->sin_addr = ip->ip_dst;
5468
5469 if (r->rt == PF_FASTROUTE) {
5470 rtalloc(ro);
5471 if (ro->ro_rt == 0) {
5472 ipstat.ips_noroute++;
5473 goto bad;
5474 }
5475
5476 ifp = ro->ro_rt->rt_ifp;
5477 ro->ro_rt->rt_use++;
5478
5479 if (ro->ro_rt->rt_flags & RTF_GATEWAY)
5480 dst = satosin(ro->ro_rt->rt_gateway);
5481 } else {
5482 if (TAILQ_EMPTY(&r->rpool.list)) {
5483 DPFPRINTF(PF_DEBUG_URGENT,
5484 ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n"));
5485 goto bad;
5486 }
5487 if (s == NULL) {
5488 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
5489 &naddr, NULL, &sn);
5490 if (!PF_AZERO(&naddr, AF_INET))
5491 dst->sin_addr.s_addr = naddr.v4.s_addr;
5492 ifp = r->rpool.cur->kif ?
5493 r->rpool.cur->kif->pfik_ifp : NULL;
5494 } else {
5495 if (!PF_AZERO(&s->rt_addr, AF_INET))
5496 dst->sin_addr.s_addr =
5497 s->rt_addr.v4.s_addr;
5498 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5499 }
5500 }
5501 if (ifp == NULL)
5502 goto bad;
5503
5504 if (oifp != ifp) {
5505 if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) {
5506 goto bad;
5507 } else if (m0 == NULL) {
5508 goto done;
5509 }
5510 if (m0->m_len < sizeof(struct ip)) {
5511 DPFPRINTF(PF_DEBUG_URGENT,
5512 ("pf_route: m0->m_len < sizeof(struct ip)\n"));
5513 goto bad;
5514 }
5515 ip = mtod(m0, struct ip *);
5516 }
5517
5518 /* Copied from FreeBSD 5.1-CURRENT ip_output. */
5519 m0->m_pkthdr.csum_flags |= CSUM_IP;
5520 sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist;
5521 if (sw_csum & CSUM_DELAY_DATA) {
5522 in_delayed_cksum(m0);
5523 sw_csum &= ~CSUM_DELAY_DATA;
5524 }
5525 m0->m_pkthdr.csum_flags &= ifp->if_hwassist;
5526 m0->m_pkthdr.csum_iphlen = (ip->ip_hl << 2);
5527
5528 if (ip->ip_len <= ifp->if_mtu ||
5529 (ifp->if_hwassist & CSUM_FRAGMENT &&
5530 (ip->ip_off & IP_DF) == 0)) {
5531 ip->ip_len = htons(ip->ip_len);
5532 ip->ip_off = htons(ip->ip_off);
5533 ip->ip_sum = 0;
5534 if (sw_csum & CSUM_DELAY_IP) {
5535 /* From KAME */
5536 if (ip->ip_v == IPVERSION &&
5537 (ip->ip_hl << 2) == sizeof(*ip)) {
5538 ip->ip_sum = in_cksum_hdr(ip);
5539 } else {
5540 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
5541 }
5542 }
5543 lwkt_reltoken(&pf_token);
5544 error = ifp->if_output(ifp, m0, sintosa(dst), ro->ro_rt);
5545 lwkt_gettoken(&pf_token);
5546 goto done;
5547 }
5548
5549 /*
5550 * Too large for interface; fragment if possible.
5551 * Must be able to put at least 8 bytes per fragment.
5552 */
5553 if (ip->ip_off & IP_DF) {
5554 ipstat.ips_cantfrag++;
5555 if (r->rt != PF_DUPTO) {
5556 icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
5557 ifp->if_mtu);
5558 goto done;
5559 } else
5560 goto bad;
5561 }
5562
5563 m1 = m0;
5564 error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum);
5565 if (error) {
5566 goto bad;
5567 }
5568
5569 for (m0 = m1; m0; m0 = m1) {
5570 m1 = m0->m_nextpkt;
5571 m0->m_nextpkt = 0;
5572 if (error == 0) {
5573 lwkt_reltoken(&pf_token);
5574 error = (*ifp->if_output)(ifp, m0, sintosa(dst),
5575 NULL);
5576 lwkt_gettoken(&pf_token);
5577 } else
5578 m_freem(m0);
5579 }
5580
5581 if (error == 0)
5582 ipstat.ips_fragmented++;
5583
5584 done:
5585 if (r->rt != PF_DUPTO)
5586 *m = NULL;
5587 if (ro == &iproute && ro->ro_rt)
5588 RTFREE(ro->ro_rt);
5589 return;
5590
5591 bad:
5592 m_freem(m0);
5593 goto done;
5594 }
5595 #endif /* INET */
5596
5597 #ifdef INET6
5598 void
5599 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5600 struct pf_state *s, struct pf_pdesc *pd)
5601 {
5602 struct mbuf *m0;
5603 struct route_in6 ip6route;
5604 struct route_in6 *ro;
5605 struct sockaddr_in6 *dst;
5606 struct ip6_hdr *ip6;
5607 struct ifnet *ifp = NULL;
5608 struct pf_addr naddr;
5609 struct pf_src_node *sn = NULL;
5610
5611 if (m == NULL || *m == NULL || r == NULL ||
5612 (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
5613 panic("pf_route6: invalid parameters");
5614
5615 if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
5616 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
5617 (*m)->m_pkthdr.pf.routed = 1;
5618 } else {
5619 if ((*m)->m_pkthdr.pf.routed++ > 3) {
5620 m0 = *m;
5621 *m = NULL;
5622 goto bad;
5623 }
5624 }
5625
5626 if (r->rt == PF_DUPTO) {
5627 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL)
5628 return;
5629 } else {
5630 if ((r->rt == PF_REPLYTO) == (r->direction == dir))
5631 return;
5632 m0 = *m;
5633 }
5634
5635 if (m0->m_len < sizeof(struct ip6_hdr)) {
5636 DPFPRINTF(PF_DEBUG_URGENT,
5637 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n"));
5638 goto bad;
5639 }
5640 ip6 = mtod(m0, struct ip6_hdr *);
5641
5642 ro = &ip6route;
5643 bzero((caddr_t)ro, sizeof(*ro));
5644 dst = (struct sockaddr_in6 *)&ro->ro_dst;
5645 dst->sin6_family = AF_INET6;
5646 dst->sin6_len = sizeof(*dst);
5647 dst->sin6_addr = ip6->ip6_dst;
5648
5649 /*
5650 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
5651 * so make sure pf.flags is clear.
5652 *
5653 * Cheat. XXX why only in the v6 case???
5654 */
5655 if (r->rt == PF_FASTROUTE) {
5656 m0->m_pkthdr.fw_flags |= PF_MBUF_TAGGED;
5657 m0->m_pkthdr.pf.flags = 0;
5658 /* XXX Re-Check when Upgrading to > 4.4 */
5659 m0->m_pkthdr.pf.statekey = NULL;
5660 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL);
5661 return;
5662 }
5663
5664 if (TAILQ_EMPTY(&r->rpool.list)) {
5665 DPFPRINTF(PF_DEBUG_URGENT,
5666 ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n"));
5667 goto bad;
5668 }
5669 if (s == NULL) {
5670 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
5671 &naddr, NULL, &sn);
5672 if (!PF_AZERO(&naddr, AF_INET6))
5673 PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5674 &naddr, AF_INET6);
5675 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
5676 } else {
5677 if (!PF_AZERO(&s->rt_addr, AF_INET6))
5678 PF_ACPY((struct pf_addr *)&dst->sin6_addr,
5679 &s->rt_addr, AF_INET6);
5680 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5681 }
5682 if (ifp == NULL)
5683 goto bad;
5684
5685 if (oifp != ifp) {
5686 if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) {
5687 goto bad;
5688 } else if (m0 == NULL) {
5689 goto done;
5690 }
5691 if (m0->m_len < sizeof(struct ip6_hdr)) {
5692 DPFPRINTF(PF_DEBUG_URGENT,
5693 ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n"));
5694 goto bad;
5695 }
5696 ip6 = mtod(m0, struct ip6_hdr *);
5697 }
5698
5699 /*
5700 * If the packet is too large for the outgoing interface,
5701 * send back an icmp6 error.
5702 */
5703 if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr))
5704 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
5705 if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) {
5706 nd6_output(ifp, ifp, m0, dst, NULL);
5707 } else {
5708 in6_ifstat_inc(ifp, ifs6_in_toobig);
5709 if (r->rt != PF_DUPTO)
5710 icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
5711 else
5712 goto bad;
5713 }
5714
5715 done:
5716 if (r->rt != PF_DUPTO)
5717 *m = NULL;
5718 return;
5719
5720 bad:
5721 m_freem(m0);
5722 goto done;
5723 }
5724 #endif /* INET6 */
5725
5726
5727 /*
5728 * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag
5729 * off is the offset where the protocol header starts
5730 * len is the total length of protocol header plus payload
5731 * returns 0 when the checksum is valid, otherwise returns 1.
5732 */
5733 /*
5734 * XXX
5735 * FreeBSD supports cksum offload for the following drivers.
5736 * em(4), gx(4), lge(4), nge(4), ti(4), xl(4)
5737 * If we can make full use of it we would outperform ipfw/ipfilter in
5738 * very heavy traffic.
5739 * I have not tested 'cause I don't have NICs that supports cksum offload.
5740 * (There might be problems. Typical phenomena would be
5741 * 1. No route message for UDP packet.
5742 * 2. No connection acceptance from external hosts regardless of rule set.)
5743 */
5744 int
5745 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p,
5746 sa_family_t af)
5747 {
5748 u_int16_t sum = 0;
5749 int hw_assist = 0;
5750 struct ip *ip;
5751
5752 if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
5753 return (1);
5754 if (m->m_pkthdr.len < off + len)
5755 return (1);
5756
5757 switch (p) {
5758 case IPPROTO_TCP:
5759 case IPPROTO_UDP:
5760 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5761 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5762 sum = m->m_pkthdr.csum_data;
5763 } else {
5764 ip = mtod(m, struct ip *);
5765 sum = in_pseudo(ip->ip_src.s_addr,
5766 ip->ip_dst.s_addr, htonl((u_short)len +
5767 m->m_pkthdr.csum_data + p));
5768 }
5769 sum ^= 0xffff;
5770 ++hw_assist;
5771 }
5772 break;
5773 case IPPROTO_ICMP:
5774 #ifdef INET6
5775 case IPPROTO_ICMPV6:
5776 #endif /* INET6 */
5777 break;
5778 default:
5779 return (1);
5780 }
5781
5782 if (!hw_assist) {
5783 switch (af) {
5784 case AF_INET:
5785 if (p == IPPROTO_ICMP) {
5786 if (m->m_len < off)
5787 return (1);
5788 m->m_data += off;
5789 m->m_len -= off;
5790 sum = in_cksum(m, len);
5791 m->m_data -= off;
5792 m->m_len += off;
5793 } else {
5794 if (m->m_len < sizeof(struct ip))
5795 return (1);
5796 sum = in_cksum_range(m, p, off, len);
5797 if (sum == 0) {
5798 m->m_pkthdr.csum_flags |=
5799 (CSUM_DATA_VALID |
5800 CSUM_PSEUDO_HDR);
5801 m->m_pkthdr.csum_data = 0xffff;
5802 }
5803 }
5804 break;
5805 #ifdef INET6
5806 case AF_INET6:
5807 if (m->m_len < sizeof(struct ip6_hdr))
5808 return (1);
5809 sum = in6_cksum(m, p, off, len);
5810 /*
5811 * XXX
5812 * IPv6 H/W cksum off-load not supported yet!
5813 *
5814 * if (sum == 0) {
5815 * m->m_pkthdr.csum_flags |=
5816 * (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
5817 * m->m_pkthdr.csum_data = 0xffff;
5818 *}
5819 */
5820 break;
5821 #endif /* INET6 */
5822 default:
5823 return (1);
5824 }
5825 }
5826 if (sum) {
5827 switch (p) {
5828 case IPPROTO_TCP:
5829 tcpstat.tcps_rcvbadsum++;
5830 break;
5831 case IPPROTO_UDP:
5832 udp_stat.udps_badsum++;
5833 break;
5834 case IPPROTO_ICMP:
5835 icmpstat.icps_checksum++;
5836 break;
5837 #ifdef INET6
5838 case IPPROTO_ICMPV6:
5839 icmp6stat.icp6s_checksum++;
5840 break;
5841 #endif /* INET6 */
5842 }
5843 return (1);
5844 }
5845 return (0);
5846 }
5847
5848 struct pf_divert *
5849 pf_find_divert(struct mbuf *m)
5850 {
5851 struct m_tag *mtag;
5852
5853 if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL)
5854 return (NULL);
5855
5856 return ((struct pf_divert *)(mtag + 1));
5857 }
5858
5859 struct pf_divert *
5860 pf_get_divert(struct mbuf *m)
5861 {
5862 struct m_tag *mtag;
5863
5864 if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL) {
5865 mtag = m_tag_get(PACKET_TAG_PF_DIVERT, sizeof(struct pf_divert),
5866 M_NOWAIT);
5867 if (mtag == NULL)
5868 return (NULL);
5869 bzero(mtag + 1, sizeof(struct pf_divert));
5870 m_tag_prepend(m, mtag);
5871 }
5872
5873 return ((struct pf_divert *)(mtag + 1));
5874 }
5875
5876 #ifdef INET
5877 int
5878 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0,
5879 struct ether_header *eh, struct inpcb *inp)
5880 {
5881 struct pfi_kif *kif;
5882 u_short action, reason = 0, log = 0;
5883 struct mbuf *m = *m0;
5884 struct ip *h = NULL;
5885 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr;
5886 struct pf_state *s = NULL;
5887 struct pf_ruleset *ruleset = NULL;
5888 struct pf_pdesc pd;
5889 int off, dirndx;
5890 #ifdef ALTQ
5891 int pqid = 0;
5892 #endif
5893
5894 if (!pf_status.running)
5895 return (PF_PASS);
5896
5897 memset(&pd, 0, sizeof(pd));
5898 #ifdef foo
5899 if (ifp->if_type == IFT_CARP && ifp->if_carpdev)
5900 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif;
5901 else
5902 #endif
5903 kif = (struct pfi_kif *)ifp->if_pf_kif;
5904
5905 if (kif == NULL) {
5906 DPFPRINTF(PF_DEBUG_URGENT,
5907 ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname));
5908 return (PF_DROP);
5909 }
5910 if (kif->pfik_flags & PFI_IFLAG_SKIP)
5911 return (PF_PASS);
5912
5913 #ifdef DIAGNOSTIC
5914 if ((m->m_flags & M_PKTHDR) == 0)
5915 panic("non-M_PKTHDR is passed to pf_test");
5916 #endif /* DIAGNOSTIC */
5917
5918 if (m->m_pkthdr.len < (int)sizeof(*h)) {
5919 action = PF_DROP;
5920 REASON_SET(&reason, PFRES_SHORT);
5921 log = 1;
5922 goto done;
5923 }
5924
5925 /*
5926 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
5927 * so make sure pf.flags is clear.
5928 */
5929 if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED)
5930 return (PF_PASS);
5931 m->m_pkthdr.pf.flags = 0;
5932 /* Re-Check when updating to > 4.4 */
5933 m->m_pkthdr.pf.statekey = NULL;
5934
5935 /* We do IP header normalization and packet reassembly here */
5936 if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) {
5937 action = PF_DROP;
5938 goto done;
5939 }
5940 m = *m0; /* pf_normalize messes with m0 */
5941 h = mtod(m, struct ip *);
5942
5943 off = h->ip_hl << 2;
5944 if (off < (int)sizeof(*h)) {
5945 action = PF_DROP;
5946 REASON_SET(&reason, PFRES_SHORT);
5947 log = 1;
5948 goto done;
5949 }
5950
5951 pd.src = (struct pf_addr *)&h->ip_src;
5952 pd.dst = (struct pf_addr *)&h->ip_dst;
5953 pd.sport = pd.dport = NULL;
5954 pd.ip_sum = &h->ip_sum;
5955 pd.proto_sum = NULL;
5956 pd.proto = h->ip_p;
5957 pd.dir = dir;
5958 pd.sidx = (dir == PF_IN) ? 0 : 1;
5959 pd.didx = (dir == PF_IN) ? 1 : 0;
5960 pd.af = AF_INET;
5961 pd.tos = h->ip_tos;
5962 pd.tot_len = h->ip_len;
5963 pd.eh = eh;
5964
5965 /* handle fragments that didn't get reassembled by normalization */
5966 if (h->ip_off & (IP_MF | IP_OFFMASK)) {
5967 action = pf_test_fragment(&r, dir, kif, m, h,
5968 &pd, &a, &ruleset);
5969 goto done;
5970 }
5971
5972 switch (h->ip_p) {
5973
5974 case IPPROTO_TCP: {
5975 struct tcphdr th;
5976
5977 pd.hdr.tcp = &th;
5978 if (!pf_pull_hdr(m, off, &th, sizeof(th),
5979 &action, &reason, AF_INET)) {
5980 log = action != PF_PASS;
5981 goto done;
5982 }
5983 pd.p_len = pd.tot_len - off - (th.th_off << 2);
5984 #ifdef ALTQ
5985 if ((th.th_flags & TH_ACK) && pd.p_len == 0)
5986 pqid = 1;
5987 #endif
5988 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
5989 if (action == PF_DROP)
5990 goto done;
5991 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
5992 &reason);
5993 if (action == PF_PASS) {
5994 pfsync_update_state(s);
5995 r = s->rule.ptr;
5996 a = s->anchor.ptr;
5997 log = s->log;
5998 } else if (s == NULL)
5999 action = pf_test_rule(&r, &s, dir, kif,
6000 m, off, h, &pd, &a, &ruleset, NULL, inp);
6001 break;
6002 }
6003
6004 case IPPROTO_UDP: {
6005 struct udphdr uh;
6006
6007 pd.hdr.udp = &uh;
6008 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
6009 &action, &reason, AF_INET)) {
6010 log = action != PF_PASS;
6011 goto done;
6012 }
6013 if (uh.uh_dport == 0 ||
6014 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
6015 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
6016 action = PF_DROP;
6017 REASON_SET(&reason, PFRES_SHORT);
6018 goto done;
6019 }
6020 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
6021 if (action == PF_PASS) {
6022 pfsync_update_state(s);
6023 r = s->rule.ptr;
6024 a = s->anchor.ptr;
6025 log = s->log;
6026 } else if (s == NULL)
6027 action = pf_test_rule(&r, &s, dir, kif,
6028 m, off, h, &pd, &a, &ruleset, NULL, inp);
6029 break;
6030 }
6031
6032 case IPPROTO_ICMP: {
6033 struct icmp ih;
6034
6035 pd.hdr.icmp = &ih;
6036 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
6037 &action, &reason, AF_INET)) {
6038 log = action != PF_PASS;
6039 goto done;
6040 }
6041 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd,
6042 &reason);
6043 if (action == PF_PASS) {
6044 pfsync_update_state(s);
6045 r = s->rule.ptr;
6046 a = s->anchor.ptr;
6047 log = s->log;
6048 } else if (s == NULL)
6049 action = pf_test_rule(&r, &s, dir, kif,
6050 m, off, h, &pd, &a, &ruleset, NULL, inp);
6051 break;
6052 }
6053
6054 default:
6055 action = pf_test_state_other(&s, dir, kif, m, &pd);
6056 if (action == PF_PASS) {
6057 pfsync_update_state(s);
6058 r = s->rule.ptr;
6059 a = s->anchor.ptr;
6060 log = s->log;
6061 } else if (s == NULL)
6062 action = pf_test_rule(&r, &s, dir, kif, m, off, h,
6063 &pd, &a, &ruleset, NULL, inp);
6064 break;
6065 }
6066
6067 done:
6068 if (action == PF_PASS && h->ip_hl > 5 &&
6069 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
6070 action = PF_DROP;
6071 REASON_SET(&reason, PFRES_IPOPTIONS);
6072 log = 1;
6073 DPFPRINTF(PF_DEBUG_MISC,
6074 ("pf: dropping packet with ip options\n"));
6075 }
6076
6077 if ((s && s->tag) || r->rtableid)
6078 pf_tag_packet(m, s ? s->tag : 0, r->rtableid);
6079
6080 #if 0
6081 if (dir == PF_IN && s && s->key[PF_SK_STACK])
6082 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK];
6083 #endif
6084
6085 #ifdef ALTQ
6086 if (action == PF_PASS && r->qid) {
6087 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
6088 if (pqid || (pd.tos & IPTOS_LOWDELAY))
6089 m->m_pkthdr.pf.qid = r->pqid;
6090 else
6091 m->m_pkthdr.pf.qid = r->qid;
6092 m->m_pkthdr.pf.ecn_af = AF_INET;
6093 m->m_pkthdr.pf.hdr = h;
6094 /* add connection hash for fairq */
6095 if (s) {
6096 /* for fairq */
6097 m->m_pkthdr.pf.state_hash = s->hash;
6098 m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED;
6099 }
6100 }
6101 #endif /* ALTQ */
6102
6103 /*
6104 * connections redirected to loopback should not match sockets
6105 * bound specifically to loopback due to security implications,
6106 * see tcp_input() and in_pcblookup_listen().
6107 */
6108 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
6109 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
6110 (s->nat_rule.ptr->action == PF_RDR ||
6111 s->nat_rule.ptr->action == PF_BINAT) &&
6112 (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET)
6113 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST;
6114
6115 if (dir == PF_IN && action == PF_PASS && r->divert.port) {
6116 struct pf_divert *divert;
6117
6118 if ((divert = pf_get_divert(m))) {
6119 m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED;
6120 divert->port = r->divert.port;
6121 divert->addr.ipv4 = r->divert.addr.v4;
6122 }
6123 }
6124
6125 if (log) {
6126 struct pf_rule *lr;
6127
6128 if (s != NULL && s->nat_rule.ptr != NULL &&
6129 s->nat_rule.ptr->log & PF_LOG_ALL)
6130 lr = s->nat_rule.ptr;
6131 else
6132 lr = r;
6133 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset,
6134 &pd);
6135 }
6136
6137 kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6138 kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;
6139
6140 if (action == PF_PASS || r->action == PF_DROP) {
6141 dirndx = (dir == PF_OUT);
6142 r->packets[dirndx]++;
6143 r->bytes[dirndx] += pd.tot_len;
6144 if (a != NULL) {
6145 a->packets[dirndx]++;
6146 a->bytes[dirndx] += pd.tot_len;
6147 }
6148 if (s != NULL) {
6149 if (s->nat_rule.ptr != NULL) {
6150 s->nat_rule.ptr->packets[dirndx]++;
6151 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6152 }
6153 if (s->src_node != NULL) {
6154 s->src_node->packets[dirndx]++;
6155 s->src_node->bytes[dirndx] += pd.tot_len;
6156 }
6157 if (s->nat_src_node != NULL) {
6158 s->nat_src_node->packets[dirndx]++;
6159 s->nat_src_node->bytes[dirndx] += pd.tot_len;
6160 }
6161 dirndx = (dir == s->direction) ? 0 : 1;
6162 s->packets[dirndx]++;
6163 s->bytes[dirndx] += pd.tot_len;
6164 }
6165 tr = r;
6166 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6167 if (nr != NULL && r == &pf_default_rule)
6168 tr = nr;
6169 if (tr->src.addr.type == PF_ADDR_TABLE)
6170 pfr_update_stats(tr->src.addr.p.tbl,
6171 (s == NULL) ? pd.src :
6172 &s->key[(s->direction == PF_IN)]->
6173 addr[(s->direction == PF_OUT)],
6174 pd.af, pd.tot_len, dir == PF_OUT,
6175 r->action == PF_PASS, tr->src.neg);
6176 if (tr->dst.addr.type == PF_ADDR_TABLE)
6177 pfr_update_stats(tr->dst.addr.p.tbl,
6178 (s == NULL) ? pd.dst :
6179 &s->key[(s->direction == PF_IN)]->
6180 addr[(s->direction == PF_IN)],
6181 pd.af, pd.tot_len, dir == PF_OUT,
6182 r->action == PF_PASS, tr->dst.neg);
6183 }
6184
6185
6186 if (action == PF_SYNPROXY_DROP) {
6187 m_freem(*m0);
6188 *m0 = NULL;
6189 action = PF_PASS;
6190 } else if (r->rt)
6191 /* pf_route can free the mbuf causing *m0 to become NULL */
6192 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd);
6193
6194 return (action);
6195 }
6196 #endif /* INET */
6197
6198 #ifdef INET6
6199 int
6200 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0,
6201 struct ether_header *eh, struct inpcb *inp)
6202 {
6203 struct pfi_kif *kif;
6204 u_short action, reason = 0, log = 0;
6205 struct mbuf *m = *m0, *n = NULL;
6206 struct ip6_hdr *h = NULL;
6207 struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr;
6208 struct pf_state *s = NULL;
6209 struct pf_ruleset *ruleset = NULL;
6210 struct pf_pdesc pd;
6211 int off, terminal = 0, dirndx, rh_cnt = 0;
6212
6213 if (!pf_status.running)
6214 return (PF_PASS);
6215
6216 memset(&pd, 0, sizeof(pd));
6217 #ifdef foo
6218 if (ifp->if_type == IFT_CARP && ifp->if_carpdev)
6219 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif;
6220 else
6221 #endif
6222 kif = (struct pfi_kif *)ifp->if_pf_kif;
6223
6224 if (kif == NULL) {
6225 DPFPRINTF(PF_DEBUG_URGENT,
6226 ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname));
6227 return (PF_DROP);
6228 }
6229 if (kif->pfik_flags & PFI_IFLAG_SKIP)
6230 return (PF_PASS);
6231
6232 #ifdef DIAGNOSTIC
6233 if ((m->m_flags & M_PKTHDR) == 0)
6234 panic("non-M_PKTHDR is passed to pf_test6");
6235 #endif /* DIAGNOSTIC */
6236
6237 if (m->m_pkthdr.len < (int)sizeof(*h)) {
6238 action = PF_DROP;
6239 REASON_SET(&reason, PFRES_SHORT);
6240 log = 1;
6241 goto done;
6242 }
6243
6244 /*
6245 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
6246 * so make sure pf.flags is clear.
6247 */
6248 if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED)
6249 return (PF_PASS);
6250 m->m_pkthdr.pf.flags = 0;
6251 /* Re-Check when updating to > 4.4 */
6252 m->m_pkthdr.pf.statekey = NULL;
6253
6254 /* We do IP header normalization and packet reassembly here */
6255 if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) {
6256 action = PF_DROP;
6257 goto done;
6258 }
6259 m = *m0; /* pf_normalize messes with m0 */
6260 h = mtod(m, struct ip6_hdr *);
6261
6262 #if 1
6263 /*
6264 * we do not support jumbogram yet. if we keep going, zero ip6_plen
6265 * will do something bad, so drop the packet for now.
6266 */
6267 if (htons(h->ip6_plen) == 0) {
6268 action = PF_DROP;
6269 REASON_SET(&reason, PFRES_NORM); /*XXX*/
6270 goto done;
6271 }
6272 #endif
6273
6274 pd.src = (struct pf_addr *)&h->ip6_src;
6275 pd.dst = (struct pf_addr *)&h->ip6_dst;
6276 pd.sport = pd.dport = NULL;
6277 pd.ip_sum = NULL;
6278 pd.proto_sum = NULL;
6279 pd.dir = dir;
6280 pd.sidx = (dir == PF_IN) ? 0 : 1;
6281 pd.didx = (dir == PF_IN) ? 1 : 0;
6282 pd.af = AF_INET6;
6283 pd.tos = 0;
6284 pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
6285 pd.eh = eh;
6286
6287 off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
6288 pd.proto = h->ip6_nxt;
6289 do {
6290 switch (pd.proto) {
6291 case IPPROTO_FRAGMENT:
6292 action = pf_test_fragment(&r, dir, kif, m, h,
6293 &pd, &a, &ruleset);
6294 if (action == PF_DROP)
6295 REASON_SET(&reason, PFRES_FRAG);
6296 goto done;
6297 case IPPROTO_ROUTING: {
6298 struct ip6_rthdr rthdr;
6299
6300 if (rh_cnt++) {
6301 DPFPRINTF(PF_DEBUG_MISC,
6302 ("pf: IPv6 more than one rthdr\n"));
6303 action = PF_DROP;
6304 REASON_SET(&reason, PFRES_IPOPTIONS);
6305 log = 1;
6306 goto done;
6307 }
6308 if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL,
6309 &reason, pd.af)) {
6310 DPFPRINTF(PF_DEBUG_MISC,
6311 ("pf: IPv6 short rthdr\n"));
6312 action = PF_DROP;
6313 REASON_SET(&reason, PFRES_SHORT);
6314 log = 1;
6315 goto done;
6316 }
6317 if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) {
6318 DPFPRINTF(PF_DEBUG_MISC,
6319 ("pf: IPv6 rthdr0\n"));
6320 action = PF_DROP;
6321 REASON_SET(&reason, PFRES_IPOPTIONS);
6322 log = 1;
6323 goto done;
6324 }
6325 /* FALLTHROUGH */
6326 }
6327 case IPPROTO_AH:
6328 case IPPROTO_HOPOPTS:
6329 case IPPROTO_DSTOPTS: {
6330 /* get next header and header length */
6331 struct ip6_ext opt6;
6332
6333 if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
6334 NULL, &reason, pd.af)) {
6335 DPFPRINTF(PF_DEBUG_MISC,
6336 ("pf: IPv6 short opt\n"));
6337 action = PF_DROP;
6338 log = 1;
6339 goto done;
6340 }
6341 if (pd.proto == IPPROTO_AH)
6342 off += (opt6.ip6e_len + 2) * 4;
6343 else
6344 off += (opt6.ip6e_len + 1) * 8;
6345 pd.proto = opt6.ip6e_nxt;
6346 /* goto the next header */
6347 break;
6348 }
6349 default:
6350 terminal++;
6351 break;
6352 }
6353 } while (!terminal);
6354
6355 /* if there's no routing header, use unmodified mbuf for checksumming */
6356 if (!n)
6357 n = m;
6358
6359 switch (pd.proto) {
6360
6361 case IPPROTO_TCP: {
6362 struct tcphdr th;
6363
6364 pd.hdr.tcp = &th;
6365 if (!pf_pull_hdr(m, off, &th, sizeof(th),
6366 &action, &reason, AF_INET6)) {
6367 log = action != PF_PASS;
6368 goto done;
6369 }
6370 pd.p_len = pd.tot_len - off - (th.th_off << 2);
6371 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
6372 if (action == PF_DROP)
6373 goto done;
6374 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
6375 &reason);
6376 if (action == PF_PASS) {
6377 pfsync_update_state(s);
6378 r = s->rule.ptr;
6379 a = s->anchor.ptr;
6380 log = s->log;
6381 } else if (s == NULL)
6382 action = pf_test_rule(&r, &s, dir, kif,
6383 m, off, h, &pd, &a, &ruleset, NULL, inp);
6384 break;
6385 }
6386
6387 case IPPROTO_UDP: {
6388 struct udphdr uh;
6389
6390 pd.hdr.udp = &uh;
6391 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
6392 &action, &reason, AF_INET6)) {
6393 log = action != PF_PASS;
6394 goto done;
6395 }
6396 if (uh.uh_dport == 0 ||
6397 ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
6398 ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
6399 action = PF_DROP;
6400 REASON_SET(&reason, PFRES_SHORT);
6401 goto done;
6402 }
6403 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
6404 if (action == PF_PASS) {
6405 pfsync_update_state(s);
6406 r = s->rule.ptr;
6407 a = s->anchor.ptr;
6408 log = s->log;
6409 } else if (s == NULL)
6410 action = pf_test_rule(&r, &s, dir, kif,
6411 m, off, h, &pd, &a, &ruleset, NULL, inp);
6412 break;
6413 }
6414
6415 case IPPROTO_ICMPV6: {
6416 struct icmp6_hdr ih;
6417
6418 pd.hdr.icmp6 = &ih;
6419 if (!pf_pull_hdr(m, off, &ih, sizeof(ih),
6420 &action, &reason, AF_INET6)) {
6421 log = action != PF_PASS;
6422 goto done;
6423 }
6424 action = pf_test_state_icmp(&s, dir, kif,
6425 m, off, h, &pd, &reason);
6426 if (action == PF_PASS) {
6427 pfsync_update_state(s);
6428 r = s->rule.ptr;
6429 a = s->anchor.ptr;
6430 log = s->log;
6431 } else if (s == NULL)
6432 action = pf_test_rule(&r, &s, dir, kif,
6433 m, off, h, &pd, &a, &ruleset, NULL, inp);
6434 break;
6435 }
6436
6437 default:
6438 action = pf_test_state_other(&s, dir, kif, m, &pd);
6439 if (action == PF_PASS) {
6440 pfsync_update_state(s);
6441 r = s->rule.ptr;
6442 a = s->anchor.ptr;
6443 log = s->log;
6444 } else if (s == NULL)
6445 action = pf_test_rule(&r, &s, dir, kif, m, off, h,
6446 &pd, &a, &ruleset, NULL, inp);
6447 break;
6448 }
6449
6450 done:
6451 if (n != m) {
6452 m_freem(n);
6453 n = NULL;
6454 }
6455
6456 /* handle dangerous IPv6 extension headers. */
6457 if (action == PF_PASS && rh_cnt &&
6458 !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
6459 action = PF_DROP;
6460 REASON_SET(&reason, PFRES_IPOPTIONS);
6461 log = 1;
6462 DPFPRINTF(PF_DEBUG_MISC,
6463 ("pf: dropping packet with dangerous v6 headers\n"));
6464 }
6465
6466 if ((s && s->tag) || r->rtableid)
6467 pf_tag_packet(m, s ? s->tag : 0, r->rtableid);
6468
6469 #if 0
6470 if (dir == PF_IN && s && s->key[PF_SK_STACK])
6471 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK];
6472 #endif
6473
6474 #ifdef ALTQ
6475 if (action == PF_PASS && r->qid) {
6476 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
6477 if (pd.tos & IPTOS_LOWDELAY)
6478 m->m_pkthdr.pf.qid = r->pqid;
6479 else
6480 m->m_pkthdr.pf.qid = r->qid;
6481 m->m_pkthdr.pf.ecn_af = AF_INET6;
6482 m->m_pkthdr.pf.hdr = h;
6483 if (s) {
6484 /* for fairq */
6485 m->m_pkthdr.pf.state_hash = s->hash;
6486 m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED;
6487 }
6488 }
6489 #endif /* ALTQ */
6490
6491 if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
6492 pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
6493 (s->nat_rule.ptr->action == PF_RDR ||
6494 s->nat_rule.ptr->action == PF_BINAT) &&
6495 IN6_IS_ADDR_LOOPBACK(&pd.dst->v6))
6496 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST;
6497
6498 if (dir == PF_IN && action == PF_PASS && r->divert.port) {
6499 struct pf_divert *divert;
6500
6501 if ((divert = pf_get_divert(m))) {
6502 m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED;
6503 divert->port = r->divert.port;
6504 divert->addr.ipv6 = r->divert.addr.v6;
6505 }
6506 }
6507
6508 if (log) {
6509 struct pf_rule *lr;
6510
6511 if (s != NULL && s->nat_rule.ptr != NULL &&
6512 s->nat_rule.ptr->log & PF_LOG_ALL)
6513 lr = s->nat_rule.ptr;
6514 else
6515 lr = r;
6516 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset,
6517 &pd);
6518 }
6519
6520 kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6521 kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;
6522
6523 if (action == PF_PASS || r->action == PF_DROP) {
6524 dirndx = (dir == PF_OUT);
6525 r->packets[dirndx]++;
6526 r->bytes[dirndx] += pd.tot_len;
6527 if (a != NULL) {
6528 a->packets[dirndx]++;
6529 a->bytes[dirndx] += pd.tot_len;
6530 }
6531 if (s != NULL) {
6532 if (s->nat_rule.ptr != NULL) {
6533 s->nat_rule.ptr->packets[dirndx]++;
6534 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6535 }
6536 if (s->src_node != NULL) {
6537 s->src_node->packets[dirndx]++;
6538 s->src_node->bytes[dirndx] += pd.tot_len;
6539 }
6540 if (s->nat_src_node != NULL) {
6541 s->nat_src_node->packets[dirndx]++;
6542 s->nat_src_node->bytes[dirndx] += pd.tot_len;
6543 }
6544 dirndx = (dir == s->direction) ? 0 : 1;
6545 s->packets[dirndx]++;
6546 s->bytes[dirndx] += pd.tot_len;
6547 }
6548 tr = r;
6549 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6550 if (nr != NULL && r == &pf_default_rule)
6551 tr = nr;
6552 if (tr->src.addr.type == PF_ADDR_TABLE)
6553 pfr_update_stats(tr->src.addr.p.tbl,
6554 (s == NULL) ? pd.src :
6555 &s->key[(s->direction == PF_IN)]->addr[0],
6556 pd.af, pd.tot_len, dir == PF_OUT,
6557 r->action == PF_PASS, tr->src.neg);
6558 if (tr->dst.addr.type == PF_ADDR_TABLE)
6559 pfr_update_stats(tr->dst.addr.p.tbl,
6560 (s == NULL) ? pd.dst :
6561 &s->key[(s->direction == PF_IN)]->addr[1],
6562 pd.af, pd.tot_len, dir == PF_OUT,
6563 r->action == PF_PASS, tr->dst.neg);
6564 }
6565
6566
6567 if (action == PF_SYNPROXY_DROP) {
6568 m_freem(*m0);
6569 *m0 = NULL;
6570 action = PF_PASS;
6571 } else if (r->rt)
6572 /* pf_route6 can free the mbuf causing *m0 to become NULL */
6573 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd);
6574
6575 return (action);
6576 }
6577 #endif /* INET6 */
6578
6579 int
6580 pf_check_congestion(struct ifqueue *ifq)
6581 {
6582 return (0);
6583 }
Cache object: eb129ba4f4ccd5127d30c76c1b487901
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