network - Fix pf build when no INET6
[dragonfly.git] / sys / net / pf / pf.c
CommitLineData
ed1f0be2 1/* $OpenBSD: pf.c,v 1.614 2008/08/02 12:34:37 henning Exp $ */
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2
3/*
4 * Copyright (c) 2004 The DragonFly Project. All rights reserved.
5 *
6 * Copyright (c) 2001 Daniel Hartmeier
ed1f0be2 7 * Copyright (c) 2002 - 2008 Henning Brauer
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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"
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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 <vm/vm_zone.h>
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55#include <sys/proc.h>
56#include <sys/kthread.h>
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57
58#include <machine/inttypes.h>
59
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60#include <sys/md5.h>
61
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62#include <net/if.h>
63#include <net/if_types.h>
64#include <net/bpf.h>
4599cf19 65#include <net/netisr.h>
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66#include <net/route.h>
67
68#include <netinet/in.h>
69#include <netinet/in_var.h>
70#include <netinet/in_systm.h>
71#include <netinet/ip.h>
72#include <netinet/ip_var.h>
73#include <netinet/tcp.h>
74#include <netinet/tcp_seq.h>
75#include <netinet/udp.h>
76#include <netinet/ip_icmp.h>
77#include <netinet/in_pcb.h>
78#include <netinet/tcp_timer.h>
79#include <netinet/tcp_var.h>
80#include <netinet/udp_var.h>
81#include <netinet/icmp_var.h>
70224baa 82#include <netinet/if_ether.h>
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83
84#include <net/pf/pfvar.h>
85#include <net/pf/if_pflog.h>
86
02742ec6 87#include <net/pf/if_pfsync.h>
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88
89#ifdef INET6
90#include <netinet/ip6.h>
91#include <netinet/in_pcb.h>
92#include <netinet/icmp6.h>
93#include <netinet6/nd6.h>
94#include <netinet6/ip6_var.h>
95#include <netinet6/in6_pcb.h>
96#endif /* INET6 */
97
98#include <sys/in_cksum.h>
4599cf19 99#include <sys/ucred.h>
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100#include <machine/limits.h>
101#include <sys/msgport2.h>
4599cf19 102#include <net/netmsg2.h>
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103
104extern int ip_optcopy(struct ip *, struct ip *);
70224baa 105extern int debug_pfugidhack;
02742ec6 106
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107struct lwkt_token pf_token = LWKT_TOKEN_MP_INITIALIZER(pf_token);
108
4b1cf444 109#define DPFPRINTF(n, x) if (pf_status.debug >= (n)) kprintf x
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110
111/*
112 * Global variables
113 */
114
315a7da3 115/* state tables */
ed1f0be2 116struct pf_state_tree pf_statetbl;
315a7da3 117
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118struct pf_altqqueue pf_altqs[2];
119struct pf_palist pf_pabuf;
120struct pf_altqqueue *pf_altqs_active;
121struct pf_altqqueue *pf_altqs_inactive;
122struct pf_status pf_status;
123
124u_int32_t ticket_altqs_active;
125u_int32_t ticket_altqs_inactive;
126int altqs_inactive_open;
127u_int32_t ticket_pabuf;
128
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129MD5_CTX pf_tcp_secret_ctx;
130u_char pf_tcp_secret[16];
131int pf_tcp_secret_init;
132int pf_tcp_iss_off;
133
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134struct pf_anchor_stackframe {
135 struct pf_ruleset *rs;
136 struct pf_rule *r;
137 struct pf_anchor_node *parent;
138 struct pf_anchor *child;
139} pf_anchor_stack[64];
02742ec6 140
315a7da3 141vm_zone_t pf_src_tree_pl, pf_rule_pl, pf_pooladdr_pl;
ed1f0be2 142vm_zone_t pf_state_pl, pf_state_key_pl, pf_state_item_pl;
315a7da3 143vm_zone_t pf_altq_pl;
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144
145void pf_print_host(struct pf_addr *, u_int16_t, u_int8_t);
02742ec6 146
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147void pf_init_threshold(struct pf_threshold *, u_int32_t,
148 u_int32_t);
149void pf_add_threshold(struct pf_threshold *);
150int pf_check_threshold(struct pf_threshold *);
151
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152void pf_change_ap(struct pf_addr *, u_int16_t *,
153 u_int16_t *, u_int16_t *, struct pf_addr *,
154 u_int16_t, u_int8_t, sa_family_t);
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155int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *,
156 struct tcphdr *, struct pf_state_peer *);
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157#ifdef INET6
158void pf_change_a6(struct pf_addr *, u_int16_t *,
159 struct pf_addr *, u_int8_t);
160#endif /* INET6 */
161void pf_change_icmp(struct pf_addr *, u_int16_t *,
162 struct pf_addr *, struct pf_addr *, u_int16_t,
163 u_int16_t *, u_int16_t *, u_int16_t *,
164 u_int16_t *, u_int8_t, sa_family_t);
165void pf_send_tcp(const struct pf_rule *, sa_family_t,
166 const struct pf_addr *, const struct pf_addr *,
167 u_int16_t, u_int16_t, u_int32_t, u_int32_t,
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168 u_int8_t, u_int16_t, u_int16_t, u_int8_t, int,
169 u_int16_t, struct ether_header *, struct ifnet *);
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170void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
171 sa_family_t, struct pf_rule *);
172struct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *,
173 int, int, struct pfi_kif *,
174 struct pf_addr *, u_int16_t, struct pf_addr *,
175 u_int16_t, int);
176struct pf_rule *pf_get_translation(struct pf_pdesc *, struct mbuf *,
177 int, int, struct pfi_kif *, struct pf_src_node **,
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178 struct pf_state_key **, struct pf_state_key **,
179 struct pf_state_key **, struct pf_state_key **,
180 struct pf_addr *, struct pf_addr *,
181 u_int16_t, u_int16_t);
182void pf_detach_state(struct pf_state *);
183int pf_state_key_setup(struct pf_pdesc *, struct pf_rule *,
184 struct pf_state_key **, struct pf_state_key **,
185 struct pf_state_key **, struct pf_state_key **,
186 struct pf_addr *, struct pf_addr *,
187 u_int16_t, u_int16_t);
188void pf_state_key_detach(struct pf_state *, int);
189u_int32_t pf_tcp_iss(struct pf_pdesc *);
315a7da3 190int pf_test_rule(struct pf_rule **, struct pf_state **,
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191 int, struct pfi_kif *, struct mbuf *, int,
192 void *, struct pf_pdesc *, struct pf_rule **,
70224baa 193 struct pf_ruleset **, struct ifqueue *, struct inpcb *);
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194static __inline int pf_create_state(struct pf_rule *, struct pf_rule *,
195 struct pf_rule *, struct pf_pdesc *,
196 struct pf_src_node *, struct pf_state_key *,
197 struct pf_state_key *, struct pf_state_key *,
198 struct pf_state_key *, struct mbuf *, int,
199 u_int16_t, u_int16_t, int *, struct pfi_kif *,
200 struct pf_state **, int, u_int16_t, u_int16_t,
201 int);
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202int pf_test_fragment(struct pf_rule **, int,
203 struct pfi_kif *, struct mbuf *, void *,
204 struct pf_pdesc *, struct pf_rule **,
205 struct pf_ruleset **);
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206int pf_tcp_track_full(struct pf_state_peer *,
207 struct pf_state_peer *, struct pf_state **,
208 struct pfi_kif *, struct mbuf *, int,
209 struct pf_pdesc *, u_short *, int *);
210int pf_tcp_track_sloppy(struct pf_state_peer *,
211 struct pf_state_peer *, struct pf_state **,
212 struct pf_pdesc *, u_short *);
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213int pf_test_state_tcp(struct pf_state **, int,
214 struct pfi_kif *, struct mbuf *, int,
215 void *, struct pf_pdesc *, u_short *);
216int pf_test_state_udp(struct pf_state **, int,
217 struct pfi_kif *, struct mbuf *, int,
218 void *, struct pf_pdesc *);
219int pf_test_state_icmp(struct pf_state **, int,
220 struct pfi_kif *, struct mbuf *, int,
70224baa 221 void *, struct pf_pdesc *, u_short *);
02742ec6 222int pf_test_state_other(struct pf_state **, int,
ed1f0be2 223 struct pfi_kif *, struct mbuf *, struct pf_pdesc *);
315a7da3 224void pf_step_into_anchor(int *, struct pf_ruleset **, int,
ed1f0be2 225 struct pf_rule **, struct pf_rule **, int *);
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226int pf_step_out_of_anchor(int *, struct pf_ruleset **,
227 int, struct pf_rule **, struct pf_rule **,
228 int *);
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229void pf_hash(struct pf_addr *, struct pf_addr *,
230 struct pf_poolhashkey *, sa_family_t);
231int pf_map_addr(u_int8_t, struct pf_rule *,
232 struct pf_addr *, struct pf_addr *,
233 struct pf_addr *, struct pf_src_node **);
234int pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *,
235 struct pf_addr *, struct pf_addr *, u_int16_t,
236 struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t,
237 struct pf_src_node **);
238void pf_route(struct mbuf **, struct pf_rule *, int,
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239 struct ifnet *, struct pf_state *,
240 struct pf_pdesc *);
02742ec6 241void pf_route6(struct mbuf **, struct pf_rule *, int,
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242 struct ifnet *, struct pf_state *,
243 struct pf_pdesc *);
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244u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t,
245 sa_family_t);
246u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t,
247 sa_family_t);
248u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t,
249 u_int16_t);
250void pf_set_rt_ifp(struct pf_state *,
251 struct pf_addr *);
252int pf_check_proto_cksum(struct mbuf *, int, int,
253 u_int8_t, sa_family_t);
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254struct pf_divert *pf_get_divert(struct mbuf *);
255void pf_print_state_parts(struct pf_state *,
256 struct pf_state_key *, struct pf_state_key *);
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257int pf_addr_wrap_neq(struct pf_addr_wrap *,
258 struct pf_addr_wrap *);
315a7da3 259struct pf_state *pf_find_state(struct pfi_kif *,
ed1f0be2 260 struct pf_state_key_cmp *, u_int, struct mbuf *);
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261int pf_src_connlimit(struct pf_state **);
262int pf_check_congestion(struct ifqueue *);
263
264extern int pf_end_threads;
265
266struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = {
267 { &pf_state_pl, PFSTATE_HIWAT },
268 { &pf_src_tree_pl, PFSNODE_HIWAT },
269 { &pf_frent_pl, PFFRAG_FRENT_HIWAT },
270 { &pfr_ktable_pl, PFR_KTABLE_HIWAT },
271 { &pfr_kentry_pl, PFR_KENTRY_HIWAT }
272};
02742ec6 273
ed1f0be2 274#define STATE_LOOKUP(i, k, d, s, m) \
02742ec6 275 do { \
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276 s = pf_find_state(i, k, d, m); \
277 if (s == NULL || (s)->timeout == PFTM_PURGE) \
02742ec6 278 return (PF_DROP); \
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279 if (d == PF_OUT && \
280 (((s)->rule.ptr->rt == PF_ROUTETO && \
281 (s)->rule.ptr->direction == PF_OUT) || \
282 ((s)->rule.ptr->rt == PF_REPLYTO && \
283 (s)->rule.ptr->direction == PF_IN)) && \
284 (s)->rt_kif != NULL && \
285 (s)->rt_kif != i) \
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286 return (PF_PASS); \
287 } while (0)
288
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289#define BOUND_IFACE(r, k) \
290 ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : pfi_all
291
292#define STATE_INC_COUNTERS(s) \
293 do { \
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294 s->rule.ptr->states_cur++; \
295 s->rule.ptr->states_tot++; \
296 if (s->anchor.ptr != NULL) { \
297 s->anchor.ptr->states_cur++; \
298 s->anchor.ptr->states_tot++; \
299 } \
300 if (s->nat_rule.ptr != NULL) { \
301 s->nat_rule.ptr->states_cur++; \
302 s->nat_rule.ptr->states_tot++; \
303 } \
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304 } while (0)
305
306#define STATE_DEC_COUNTERS(s) \
307 do { \
308 if (s->nat_rule.ptr != NULL) \
ed1f0be2 309 s->nat_rule.ptr->states_cur--; \
70224baa 310 if (s->anchor.ptr != NULL) \
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311 s->anchor.ptr->states_cur--; \
312 s->rule.ptr->states_cur--; \
70224baa 313 } while (0)
02742ec6 314
70224baa 315static __inline int pf_src_compare(struct pf_src_node *, struct pf_src_node *);
ed1f0be2 316static __inline int pf_state_compare_key(struct pf_state_key *,
315a7da3 317 struct pf_state_key *);
70224baa 318static __inline int pf_state_compare_id(struct pf_state *,
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319 struct pf_state *);
320
321struct pf_src_tree tree_src_tracking;
322
323struct pf_state_tree_id tree_id;
70224baa 324struct pf_state_queue state_list;
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325
326RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare);
ed1f0be2 327RB_GENERATE(pf_state_tree, pf_state_key, entry, pf_state_compare_key);
02742ec6 328RB_GENERATE(pf_state_tree_id, pf_state,
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329 entry_id, pf_state_compare_id);
330
70224baa 331static __inline int
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332pf_src_compare(struct pf_src_node *a, struct pf_src_node *b)
333{
334 int diff;
335
336 if (a->rule.ptr > b->rule.ptr)
337 return (1);
338 if (a->rule.ptr < b->rule.ptr)
339 return (-1);
340 if ((diff = a->af - b->af) != 0)
341 return (diff);
342 switch (a->af) {
343#ifdef INET
344 case AF_INET:
345 if (a->addr.addr32[0] > b->addr.addr32[0])
346 return (1);
347 if (a->addr.addr32[0] < b->addr.addr32[0])
348 return (-1);
349 break;
350#endif /* INET */
351#ifdef INET6
352 case AF_INET6:
353 if (a->addr.addr32[3] > b->addr.addr32[3])
354 return (1);
355 if (a->addr.addr32[3] < b->addr.addr32[3])
356 return (-1);
357 if (a->addr.addr32[2] > b->addr.addr32[2])
358 return (1);
359 if (a->addr.addr32[2] < b->addr.addr32[2])
360 return (-1);
361 if (a->addr.addr32[1] > b->addr.addr32[1])
362 return (1);
363 if (a->addr.addr32[1] < b->addr.addr32[1])
364 return (-1);
365 if (a->addr.addr32[0] > b->addr.addr32[0])
366 return (1);
367 if (a->addr.addr32[0] < b->addr.addr32[0])
368 return (-1);
369 break;
370#endif /* INET6 */
371 }
372 return (0);
373}
374
a814431a 375u_int32_t
315a7da3 376pf_state_hash(struct pf_state_key *sk)
5950bf01 377{
ed1f0be2 378 u_int32_t hv = (u_int32_t)(((intptr_t)sk >> 6) ^ ((intptr_t)sk >> 15));
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379 if (hv == 0) /* disallow 0 */
380 hv = 1;
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381 return(hv);
382}
383
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384#ifdef INET6
385void
386pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
387{
388 switch (af) {
389#ifdef INET
390 case AF_INET:
391 dst->addr32[0] = src->addr32[0];
392 break;
393#endif /* INET */
394 case AF_INET6:
395 dst->addr32[0] = src->addr32[0];
396 dst->addr32[1] = src->addr32[1];
397 dst->addr32[2] = src->addr32[2];
398 dst->addr32[3] = src->addr32[3];
399 break;
400 }
401}
70224baa 402#endif /* INET6 */
02742ec6 403
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404void
405pf_init_threshold(struct pf_threshold *threshold,
406 u_int32_t limit, u_int32_t seconds)
407{
408 threshold->limit = limit * PF_THRESHOLD_MULT;
409 threshold->seconds = seconds;
410 threshold->count = 0;
411 threshold->last = time_second;
412}
413
414void
415pf_add_threshold(struct pf_threshold *threshold)
416{
417 u_int32_t t = time_second, diff = t - threshold->last;
418
419 if (diff >= threshold->seconds)
420 threshold->count = 0;
421 else
422 threshold->count -= threshold->count * diff /
423 threshold->seconds;
424 threshold->count += PF_THRESHOLD_MULT;
425 threshold->last = t;
426}
427
428int
429pf_check_threshold(struct pf_threshold *threshold)
430{
431 return (threshold->count > threshold->limit);
432}
433
434int
435pf_src_connlimit(struct pf_state **state)
436{
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437 int bad = 0;
438
439 (*state)->src_node->conn++;
440 (*state)->src.tcp_est = 1;
441 pf_add_threshold(&(*state)->src_node->conn_rate);
442
443 if ((*state)->rule.ptr->max_src_conn &&
444 (*state)->rule.ptr->max_src_conn <
445 (*state)->src_node->conn) {
446 pf_status.lcounters[LCNT_SRCCONN]++;
447 bad++;
448 }
449
450 if ((*state)->rule.ptr->max_src_conn_rate.limit &&
451 pf_check_threshold(&(*state)->src_node->conn_rate)) {
452 pf_status.lcounters[LCNT_SRCCONNRATE]++;
453 bad++;
454 }
455
456 if (!bad)
457 return (0);
458
459 if ((*state)->rule.ptr->overload_tbl) {
460 struct pfr_addr p;
461 u_int32_t killed = 0;
462
463 pf_status.lcounters[LCNT_OVERLOAD_TABLE]++;
464 if (pf_status.debug >= PF_DEBUG_MISC) {
465 kprintf("pf_src_connlimit: blocking address ");
466 pf_print_host(&(*state)->src_node->addr, 0,
ed1f0be2 467 (*state)->key[PF_SK_WIRE]->af);
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468 }
469
470 bzero(&p, sizeof(p));
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471 p.pfra_af = (*state)->key[PF_SK_WIRE]->af;
472 switch ((*state)->key[PF_SK_WIRE]->af) {
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473#ifdef INET
474 case AF_INET:
475 p.pfra_net = 32;
476 p.pfra_ip4addr = (*state)->src_node->addr.v4;
477 break;
478#endif /* INET */
479#ifdef INET6
480 case AF_INET6:
481 p.pfra_net = 128;
482 p.pfra_ip6addr = (*state)->src_node->addr.v6;
483 break;
484#endif /* INET6 */
485 }
486
487 pfr_insert_kentry((*state)->rule.ptr->overload_tbl,
488 &p, time_second);
489
490 /* kill existing states if that's required. */
491 if ((*state)->rule.ptr->flush) {
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492 struct pf_state_key *sk;
493 struct pf_state *st;
70224baa 494
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495 pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++;
496 RB_FOREACH(st, pf_state_tree_id, &tree_id) {
ed1f0be2 497 sk = st->key[PF_SK_WIRE];
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498 /*
499 * Kill states from this source. (Only those
500 * from the same rule if PF_FLUSH_GLOBAL is not
501 * set)
502 */
315a7da3 503 if (sk->af ==
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504 (*state)->key[PF_SK_WIRE]->af &&
505 (((*state)->direction == PF_OUT &&
70224baa 506 PF_AEQ(&(*state)->src_node->addr,
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507 &sk->addr[0], sk->af)) ||
508 ((*state)->direction == PF_IN &&
70224baa 509 PF_AEQ(&(*state)->src_node->addr,
ed1f0be2 510 &sk->addr[1], sk->af))) &&
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511 ((*state)->rule.ptr->flush &
512 PF_FLUSH_GLOBAL ||
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513 (*state)->rule.ptr == st->rule.ptr)) {
514 st->timeout = PFTM_PURGE;
515 st->src.state = st->dst.state =
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516 TCPS_CLOSED;
517 killed++;
518 }
519 }
520 if (pf_status.debug >= PF_DEBUG_MISC)
521 kprintf(", %u states killed", killed);
522 }
523 if (pf_status.debug >= PF_DEBUG_MISC)
524 kprintf("\n");
525 }
526
527 /* kill this state */
528 (*state)->timeout = PFTM_PURGE;
529 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
530 return (1);
531}
532
02742ec6
JS
533int
534pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
535 struct pf_addr *src, sa_family_t af)
536{
537 struct pf_src_node k;
538
539 if (*sn == NULL) {
540 k.af = af;
541 PF_ACPY(&k.addr, src, af);
542 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
543 rule->rpool.opts & PF_POOL_STICKYADDR)
544 k.rule.ptr = rule;
545 else
546 k.rule.ptr = NULL;
547 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
548 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
549 }
550 if (*sn == NULL) {
551 if (!rule->max_src_nodes ||
552 rule->src_nodes < rule->max_src_nodes)
ed1f0be2 553 (*sn) = pool_get(&pf_src_tree_pl, PR_NOWAIT | PR_ZERO);
70224baa
JL
554 else
555 pf_status.lcounters[LCNT_SRCNODES]++;
02742ec6
JS
556 if ((*sn) == NULL)
557 return (-1);
70224baa
JL
558
559 pf_init_threshold(&(*sn)->conn_rate,
560 rule->max_src_conn_rate.limit,
561 rule->max_src_conn_rate.seconds);
562
02742ec6
JS
563 (*sn)->af = af;
564 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
565 rule->rpool.opts & PF_POOL_STICKYADDR)
566 (*sn)->rule.ptr = rule;
567 else
568 (*sn)->rule.ptr = NULL;
569 PF_ACPY(&(*sn)->addr, src, af);
570 if (RB_INSERT(pf_src_tree,
571 &tree_src_tracking, *sn) != NULL) {
572 if (pf_status.debug >= PF_DEBUG_MISC) {
4b1cf444 573 kprintf("pf: src_tree insert failed: ");
02742ec6 574 pf_print_host(&(*sn)->addr, 0, af);
4b1cf444 575 kprintf("\n");
02742ec6
JS
576 }
577 pool_put(&pf_src_tree_pl, *sn);
578 return (-1);
579 }
580 (*sn)->creation = time_second;
581 (*sn)->ruletype = rule->action;
582 if ((*sn)->rule.ptr != NULL)
583 (*sn)->rule.ptr->src_nodes++;
584 pf_status.scounters[SCNT_SRC_NODE_INSERT]++;
585 pf_status.src_nodes++;
586 } else {
587 if (rule->max_src_states &&
70224baa
JL
588 (*sn)->states >= rule->max_src_states) {
589 pf_status.lcounters[LCNT_SRCSTATES]++;
02742ec6 590 return (-1);
70224baa 591 }
02742ec6
JS
592 }
593 return (0);
594}
595
ed1f0be2
JL
596/* state table stuff */
597
598static __inline int
599pf_state_compare_key(struct pf_state_key *a, struct pf_state_key *b)
315a7da3 600{
ed1f0be2
JL
601 int diff;
602
603 if ((diff = a->proto - b->proto) != 0)
604 return (diff);
605 if ((diff = a->af - b->af) != 0)
606 return (diff);
607 switch (a->af) {
608#ifdef INET
609 case AF_INET:
610 if (a->addr[0].addr32[0] > b->addr[0].addr32[0])
611 return (1);
612 if (a->addr[0].addr32[0] < b->addr[0].addr32[0])
613 return (-1);
614 if (a->addr[1].addr32[0] > b->addr[1].addr32[0])
615 return (1);
616 if (a->addr[1].addr32[0] < b->addr[1].addr32[0])
617 return (-1);
618 break;
619#endif /* INET */
620#ifdef INET6
621 case AF_INET6:
622 if (a->addr[0].addr32[3] > b->addr[0].addr32[3])
623 return (1);
624 if (a->addr[0].addr32[3] < b->addr[0].addr32[3])
625 return (-1);
626 if (a->addr[1].addr32[3] > b->addr[1].addr32[3])
627 return (1);
628 if (a->addr[1].addr32[3] < b->addr[1].addr32[3])
629 return (-1);
630 if (a->addr[0].addr32[2] > b->addr[0].addr32[2])
631 return (1);
632 if (a->addr[0].addr32[2] < b->addr[0].addr32[2])
633 return (-1);
634 if (a->addr[1].addr32[2] > b->addr[1].addr32[2])
635 return (1);
636 if (a->addr[1].addr32[2] < b->addr[1].addr32[2])
637 return (-1);
638 if (a->addr[0].addr32[1] > b->addr[0].addr32[1])
639 return (1);
640 if (a->addr[0].addr32[1] < b->addr[0].addr32[1])
641 return (-1);
642 if (a->addr[1].addr32[1] > b->addr[1].addr32[1])
643 return (1);
644 if (a->addr[1].addr32[1] < b->addr[1].addr32[1])
645 return (-1);
646 if (a->addr[0].addr32[0] > b->addr[0].addr32[0])
647 return (1);
648 if (a->addr[0].addr32[0] < b->addr[0].addr32[0])
649 return (-1);
650 if (a->addr[1].addr32[0] > b->addr[1].addr32[0])
651 return (1);
652 if (a->addr[1].addr32[0] < b->addr[1].addr32[0])
653 return (-1);
654 break;
655#endif /* INET6 */
315a7da3 656 }
ed1f0be2
JL
657
658 if ((diff = a->port[0] - b->port[0]) != 0)
659 return (diff);
660 if ((diff = a->port[1] - b->port[1]) != 0)
661 return (diff);
662
663 return (0);
664}
665
666static __inline int
667pf_state_compare_id(struct pf_state *a, struct pf_state *b)
668{
669 if (a->id > b->id)
670 return (1);
671 if (a->id < b->id)
672 return (-1);
673 if (a->creatorid > b->creatorid)
674 return (1);
675 if (a->creatorid < b->creatorid)
676 return (-1);
677
678 return (0);
315a7da3
JL
679}
680
02742ec6 681int
ed1f0be2 682pf_state_key_attach(struct pf_state_key *sk, struct pf_state *s, int idx)
02742ec6 683{
ed1f0be2
JL
684 struct pf_state_item *si;
685 struct pf_state_key *cur;
315a7da3 686
ed1f0be2 687 KKASSERT(s->key[idx] == NULL); /* XXX handle this? */
315a7da3 688
ed1f0be2 689 if ((cur = RB_INSERT(pf_state_tree, &pf_statetbl, sk)) != NULL) {
315a7da3 690 /* key exists. check for same kif, if none, add to key */
ed1f0be2
JL
691 TAILQ_FOREACH(si, &cur->states, entry)
692 if (si->s->kif == s->kif &&
693 si->s->direction == s->direction) {
694 if (pf_status.debug >= PF_DEBUG_MISC) {
695 kprintf(
696 "pf: %s key attach failed on %s: ",
697 (idx == PF_SK_WIRE) ?
698 "wire" : "stack",
699 s->kif->pfik_name);
700 pf_print_state_parts(s,
701 (idx == PF_SK_WIRE) ? sk : NULL,
702 (idx == PF_SK_STACK) ? sk : NULL);
703 kprintf("\n");
704 }
705 pool_put(&pf_state_key_pl, sk);
706 return (-1); /* collision! */
315a7da3 707 }
ed1f0be2
JL
708 pool_put(&pf_state_key_pl, sk);
709 s->key[idx] = cur;
710 } else
711 s->key[idx] = sk;
02742ec6 712
ed1f0be2
JL
713 if ((si = pool_get(&pf_state_item_pl, PR_NOWAIT)) == NULL) {
714 pf_state_key_detach(s, idx);
02742ec6
JS
715 return (-1);
716 }
ed1f0be2 717 si->s = s;
02742ec6 718
ed1f0be2
JL
719 /* list is sorted, if-bound states before floating */
720 if (s->kif == pfi_all)
721 TAILQ_INSERT_TAIL(&s->key[idx]->states, si, entry);
722 else
723 TAILQ_INSERT_HEAD(&s->key[idx]->states, si, entry);
02742ec6
JS
724 return (0);
725}
726
727void
ed1f0be2 728pf_detach_state(struct pf_state *s)
02742ec6 729{
ed1f0be2
JL
730 if (s->key[PF_SK_WIRE] == s->key[PF_SK_STACK])
731 s->key[PF_SK_WIRE] = NULL;
70224baa 732
ed1f0be2
JL
733 if (s->key[PF_SK_STACK] != NULL)
734 pf_state_key_detach(s, PF_SK_STACK);
735
736 if (s->key[PF_SK_WIRE] != NULL)
737 pf_state_key_detach(s, PF_SK_WIRE);
738}
739
740void
741pf_state_key_detach(struct pf_state *s, int idx)
742{
743 struct pf_state_item *si;
744
745 si = TAILQ_FIRST(&s->key[idx]->states);
746 while (si && si->s != s)
747 si = TAILQ_NEXT(si, entry);
748
749 if (si) {
750 TAILQ_REMOVE(&s->key[idx]->states, si, entry);
751 pool_put(&pf_state_item_pl, si);
752 }
753
754 if (TAILQ_EMPTY(&s->key[idx]->states)) {
755 RB_REMOVE(pf_state_tree, &pf_statetbl, s->key[idx]);
756 if (s->key[idx]->reverse)
757 s->key[idx]->reverse->reverse = NULL;
758 if (s->key[idx]->inp)
759 s->key[idx]->inp->inp_pf_sk = NULL;
760 pool_put(&pf_state_key_pl, s->key[idx]);
761 }
762 s->key[idx] = NULL;
763}
764
765struct pf_state_key *
766pf_alloc_state_key(int pool_flags)
767{
768 struct pf_state_key *sk;
769
770 if ((sk = pool_get(&pf_state_key_pl, pool_flags)) == NULL)
771 return (NULL);
772 TAILQ_INIT(&sk->states);
773
774 return (sk);
775}
776
777int
778pf_state_key_setup(struct pf_pdesc *pd, struct pf_rule *nr,
779 struct pf_state_key **skw, struct pf_state_key **sks,
780 struct pf_state_key **skp, struct pf_state_key **nkp,
781 struct pf_addr *saddr, struct pf_addr *daddr,
782 u_int16_t sport, u_int16_t dport)
783{
784 KKASSERT((*skp == NULL && *nkp == NULL));
785
786 if ((*skp = pf_alloc_state_key(PR_NOWAIT | PR_ZERO)) == NULL)
787 return (ENOMEM);
788
789 PF_ACPY(&(*skp)->addr[pd->sidx], saddr, pd->af);
790 PF_ACPY(&(*skp)->addr[pd->didx], daddr, pd->af);
791 (*skp)->port[pd->sidx] = sport;
792 (*skp)->port[pd->didx] = dport;
793 (*skp)->proto = pd->proto;
794 (*skp)->af = pd->af;
795
796 if (nr != NULL) {
797 if ((*nkp = pf_alloc_state_key(PR_NOWAIT | PR_ZERO)) == NULL)
798 return (ENOMEM); /* caller must handle cleanup */
799
800 /* XXX maybe just bcopy and TAILQ_INIT(&(*nkp)->states) */
801 PF_ACPY(&(*nkp)->addr[0], &(*skp)->addr[0], pd->af);
802 PF_ACPY(&(*nkp)->addr[1], &(*skp)->addr[1], pd->af);
803 (*nkp)->port[0] = (*skp)->port[0];
804 (*nkp)->port[1] = (*skp)->port[1];
805 (*nkp)->proto = pd->proto;
806 (*nkp)->af = pd->af;
807 } else
808 *nkp = *skp;
809
810 if (pd->dir == PF_IN) {
811 *skw = *skp;
812 *sks = *nkp;
813 } else {
814 *sks = *skp;
815 *skw = *nkp;
816 }
817 return (0);
818}
819
820
821int
822pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw,
823 struct pf_state_key *sks, struct pf_state *s)
824{
825 s->kif = kif;
826
827 if (skw == sks) {
828 if (pf_state_key_attach(skw, s, PF_SK_WIRE))
829 return (-1);
830 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE];
831 } else {
832 if (pf_state_key_attach(skw, s, PF_SK_WIRE)) {
833 pool_put(&pf_state_key_pl, sks);
834 return (-1);
835 }
836 if (pf_state_key_attach(sks, s, PF_SK_STACK)) {
837 pf_state_key_detach(s, PF_SK_WIRE);
838 return (-1);
839 }
840 }
841
842 if (s->id == 0 && s->creatorid == 0) {
843 s->id = htobe64(pf_status.stateid++);
844 s->creatorid = pf_status.hostid;
845 }
846 if (RB_INSERT(pf_state_tree_id, &tree_id, s) != NULL) {
847 if (pf_status.debug >= PF_DEBUG_MISC) {
848 kprintf("pf: state insert failed: "
849 "id: %016jx creatorid: %08x",
850 (uintmax_t)be64toh(s->id), ntohl(s->creatorid));
851 if (s->sync_flags & PFSTATE_FROMSYNC)
852 kprintf(" (from sync)");
853 kprintf("\n");
854 }
855 pf_detach_state(s);
856 return (-1);
857 }
858 TAILQ_INSERT_TAIL(&state_list, s, entry_list);
859 pf_status.fcounters[FCNT_STATE_INSERT]++;
860 pf_status.states++;
861 pfi_kif_ref(kif, PFI_KIF_REF_STATE);
862 pfsync_insert_state(s);
863 return (0);
864}
865
866struct pf_state *
867pf_find_state_byid(struct pf_state_cmp *key)
868{
869 pf_status.fcounters[FCNT_STATE_SEARCH]++;
870
871 return (RB_FIND(pf_state_tree_id, &tree_id, (struct pf_state *)key));
872}
873
874struct pf_state *
875pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir,
876 struct mbuf *m)
877{
878 struct pf_state_key *sk;
879 struct pf_state_item *si;
880
881 pf_status.fcounters[FCNT_STATE_SEARCH]++;
882
883 if (dir == PF_OUT && m->m_pkthdr.pf.statekey &&
884 ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse)
885 sk = ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse;
886 else {
887 if ((sk = RB_FIND(pf_state_tree, &pf_statetbl,
888 (struct pf_state_key *)key)) == NULL)
889 return (NULL);
890 if (dir == PF_OUT && m->m_pkthdr.pf.statekey) {
891 ((struct pf_state_key *)
892 m->m_pkthdr.pf.statekey)->reverse = sk;
893 sk->reverse = m->m_pkthdr.pf.statekey;
894 }
895 }
896
897 if (dir == PF_OUT)
898 m->m_pkthdr.pf.statekey = NULL;
899
900 /* list is sorted, if-bound states before floating ones */
901 TAILQ_FOREACH(si, &sk->states, entry)
902 if ((si->s->kif == pfi_all || si->s->kif == kif) &&
903 sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] :
904 si->s->key[PF_SK_STACK]))
905 return (si->s);
906
907 return (NULL);
908}
909
910struct pf_state *
911pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more)
912{
913 struct pf_state_key *sk;
914 struct pf_state_item *si, *ret = NULL;
915
916 pf_status.fcounters[FCNT_STATE_SEARCH]++;
917
918 sk = RB_FIND(pf_state_tree, &pf_statetbl, (struct pf_state_key *)key);
919
920 if (sk != NULL) {
921 TAILQ_FOREACH(si, &sk->states, entry)
922 if (dir == PF_INOUT ||
923 (sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] :
924 si->s->key[PF_SK_STACK]))) {
925 if (more == NULL)
926 return (si->s);
927
928 if (ret)
929 (*more)++;
930 else
931 ret = si;
932 }
933 }
934 return (ret ? ret->s : NULL);
935}
936
937/* END state table stuff */
938
939
940void
941pf_purge_thread(void *v)
942{
943 int nloops = 0;
944 int locked = 0;
945
946 lwkt_gettoken(&pf_token);
947 for (;;) {
948 tsleep(pf_purge_thread, PWAIT, "pftm", 1 * hz);
70224baa
JL
949
950 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
951
952 if (pf_end_threads) {
953 pf_purge_expired_states(pf_status.states, 1);
954 pf_purge_expired_fragments();
955 pf_purge_expired_src_nodes(1);
956 pf_end_threads++;
957
958 lockmgr(&pf_consistency_lock, LK_RELEASE);
959 wakeup(pf_purge_thread);
960 kthread_exit();
961 }
962 crit_enter();
963
964 /* process a fraction of the state table every second */
965 if(!pf_purge_expired_states(1 + (pf_status.states
966 / pf_default_rule.timeout[PFTM_INTERVAL]), 0)) {
02742ec6 967
70224baa
JL
968 pf_purge_expired_states(1 + (pf_status.states
969 / pf_default_rule.timeout[PFTM_INTERVAL]), 1);
970 }
02742ec6 971
70224baa
JL
972 /* purge other expired types every PFTM_INTERVAL seconds */
973 if (++nloops >= pf_default_rule.timeout[PFTM_INTERVAL]) {
974 pf_purge_expired_fragments();
975 if (!pf_purge_expired_src_nodes(locked)) {
976 pf_purge_expired_src_nodes(1);
977 }
978 nloops = 0;
979 }
980 crit_exit();
981 lockmgr(&pf_consistency_lock, LK_RELEASE);
982 }
aa1da187 983 lwkt_reltoken(&pf_token);
02742ec6
JS
984}
985
986u_int32_t
987pf_state_expires(const struct pf_state *state)
988{
989 u_int32_t timeout;
990 u_int32_t start;
991 u_int32_t end;
992 u_int32_t states;
993
994 /* handle all PFTM_* > PFTM_MAX here */
995 if (state->timeout == PFTM_PURGE)
996 return (time_second);
997 if (state->timeout == PFTM_UNTIL_PACKET)
998 return (0);
70224baa 999 KKASSERT(state->timeout != PFTM_UNLINKED);
ed1f0be2 1000 KKASSERT(state->timeout < PFTM_MAX);
02742ec6
JS
1001 timeout = state->rule.ptr->timeout[state->timeout];
1002 if (!timeout)
1003 timeout = pf_default_rule.timeout[state->timeout];
1004 start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
1005 if (start) {
1006 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
ed1f0be2 1007 states = state->rule.ptr->states_cur;
02742ec6
JS
1008 } else {
1009 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START];
1010 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END];
1011 states = pf_status.states;
1012 }
1013 if (end && states > start && start < end) {
1014 if (states < end)
1015 return (state->expire + timeout * (end - states) /
1016 (end - start));
1017 else
1018 return (time_second);
1019 }
1020 return (state->expire + timeout);
1021}
1022
70224baa
JL
1023int
1024pf_purge_expired_src_nodes(int waslocked)
02742ec6
JS
1025{
1026 struct pf_src_node *cur, *next;
70224baa 1027 int locked = waslocked;
02742ec6
JS
1028
1029 for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) {
1030 next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur);
1031
1032 if (cur->states <= 0 && cur->expire <= time_second) {
70224baa
JL
1033 if (! locked) {
1034 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
1035 next = RB_NEXT(pf_src_tree,
1036 &tree_src_tracking, cur);
1037 locked = 1;
1038 }
02742ec6
JS
1039 if (cur->rule.ptr != NULL) {
1040 cur->rule.ptr->src_nodes--;
ed1f0be2 1041 if (cur->rule.ptr->states_cur <= 0 &&
02742ec6
JS
1042 cur->rule.ptr->max_src_nodes <= 0)
1043 pf_rm_rule(NULL, cur->rule.ptr);
1044 }
1045 RB_REMOVE(pf_src_tree, &tree_src_tracking, cur);
1046 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
1047 pf_status.src_nodes--;
1048 pool_put(&pf_src_tree_pl, cur);
1049 }
1050 }
70224baa
JL
1051
1052 if (locked && !waslocked)
1053 lockmgr(&pf_consistency_lock, LK_RELEASE);
1054 return(1);
02742ec6
JS
1055}
1056
1057void
1058pf_src_tree_remove_state(struct pf_state *s)
1059{
1060 u_int32_t timeout;
1061
1062 if (s->src_node != NULL) {
05ac5751
JL
1063 if (s->src.tcp_est)
1064 --s->src_node->conn;
02742ec6
JS
1065 if (--s->src_node->states <= 0) {
1066 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
1067 if (!timeout)
1068 timeout =
1069 pf_default_rule.timeout[PFTM_SRC_NODE];
1070 s->src_node->expire = time_second + timeout;
1071 }
1072 }
1073 if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
1074 if (--s->nat_src_node->states <= 0) {
1075 timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
1076 if (!timeout)
1077 timeout =
1078 pf_default_rule.timeout[PFTM_SRC_NODE];
1079 s->nat_src_node->expire = time_second + timeout;
1080 }
1081 }
1082 s->src_node = s->nat_src_node = NULL;
1083}
1084
70224baa
JL
1085/* callers should be at crit_enter() */
1086void
1087pf_unlink_state(struct pf_state *cur)
02742ec6 1088{
70224baa 1089 if (cur->src.state == PF_TCPS_PROXY_DST) {
ed1f0be2
JL
1090 /* XXX wire key the right one? */
1091 pf_send_tcp(cur->rule.ptr, cur->key[PF_SK_WIRE]->af,
1092 &cur->key[PF_SK_WIRE]->addr[1],
1093 &cur->key[PF_SK_WIRE]->addr[0],
1094 cur->key[PF_SK_WIRE]->port[1],
1095 cur->key[PF_SK_WIRE]->port[0],
70224baa
JL
1096 cur->src.seqhi, cur->src.seqlo + 1,
1097 TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL);
1098 }
70224baa 1099 RB_REMOVE(pf_state_tree_id, &tree_id, cur);
70224baa 1100 if (cur->creatorid == pf_status.hostid)
f0ea6854 1101 pfsync_delete_state(cur);
70224baa
JL
1102 cur->timeout = PFTM_UNLINKED;
1103 pf_src_tree_remove_state(cur);
ed1f0be2 1104 pf_detach_state(cur);
02742ec6
JS
1105}
1106
aa1da187
MD
1107static struct pf_state *purge_cur;
1108
70224baa
JL
1109/* callers should be at crit_enter() and hold the
1110 * write_lock on pf_consistency_lock */
f0ea6854 1111void
70224baa 1112pf_free_state(struct pf_state *cur)
f0ea6854 1113{
70224baa
JL
1114 if (pfsyncif != NULL &&
1115 (pfsyncif->sc_bulk_send_next == cur ||
1116 pfsyncif->sc_bulk_terminator == cur))
1117 return;
70224baa 1118 KKASSERT(cur->timeout == PFTM_UNLINKED);
ed1f0be2 1119 if (--cur->rule.ptr->states_cur <= 0 &&
70224baa
JL
1120 cur->rule.ptr->src_nodes <= 0)
1121 pf_rm_rule(NULL, cur->rule.ptr);
1122 if (cur->nat_rule.ptr != NULL)
ed1f0be2 1123 if (--cur->nat_rule.ptr->states_cur <= 0 &&
70224baa
JL
1124 cur->nat_rule.ptr->src_nodes <= 0)
1125 pf_rm_rule(NULL, cur->nat_rule.ptr);
1126 if (cur->anchor.ptr != NULL)
ed1f0be2 1127 if (--cur->anchor.ptr->states_cur <= 0)
70224baa
JL
1128 pf_rm_rule(NULL, cur->anchor.ptr);
1129 pf_normalize_tcp_cleanup(cur);
315a7da3 1130 pfi_kif_unref(cur->kif, PFI_KIF_REF_STATE);
aa1da187
MD
1131
1132 /*
1133 * We may be freeing pf_purge_expired_states()'s saved scan entry,
1134 * adjust it if necessary.
1135 */
1136 if (purge_cur == cur) {
1137 kprintf("PURGE CONFLICT\n");
1138 purge_cur = TAILQ_NEXT(purge_cur, entry_list);
1139 }
315a7da3 1140 TAILQ_REMOVE(&state_list, cur, entry_list);
70224baa
JL
1141 if (cur->tag)
1142 pf_tag_unref(cur->tag);
1143 pool_put(&pf_state_pl, cur);
1144 pf_status.fcounters[FCNT_STATE_REMOVALS]++;
1145 pf_status.states--;
f0ea6854
MD
1146}
1147
70224baa
JL
1148int
1149pf_purge_expired_states(u_int32_t maxcheck, int waslocked)
1150{
aa1da187 1151 struct pf_state *cur;
70224baa
JL
1152 int locked = waslocked;
1153
1154 while (maxcheck--) {
aa1da187
MD
1155 /*
1156 * Wrap to start of list when we hit the end
1157 */
1158 cur = purge_cur;
70224baa
JL
1159 if (cur == NULL) {
1160 cur = TAILQ_FIRST(&state_list);
1161 if (cur == NULL)
1162 break; /* list empty */
1163 }
1164
aa1da187
MD
1165 /*
1166 * Setup next (purge_cur) while we process this one. If we block and
1167 * something else deletes purge_cur, pf_free_state() will adjust it further
1168 * ahead.
1169 */
1170 purge_cur = TAILQ_NEXT(cur, entry_list);
70224baa
JL
1171
1172 if (cur->timeout == PFTM_UNLINKED) {
1173 /* free unlinked state */
1174 if (! locked) {
1175 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
1176 locked = 1;
1177 }
1178 pf_free_state(cur);
1179 } else if (pf_state_expires(cur) <= time_second) {
1180 /* unlink and free expired state */
1181 pf_unlink_state(cur);
1182 if (! locked) {
1183 if (!lockmgr(&pf_consistency_lock, LK_EXCLUSIVE))
1184 return (0);
1185 locked = 1;
1186 }
1187 pf_free_state(cur);
1188 }
70224baa
JL
1189 }
1190
1191 if (locked)
1192 lockmgr(&pf_consistency_lock, LK_RELEASE);
1193 return (1);
1194}
f0ea6854 1195
02742ec6
JS
1196int
1197pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw)
1198{
1199 if (aw->type != PF_ADDR_TABLE)
1200 return (0);
1201 if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL)
1202 return (1);
1203 return (0);
1204}
1205
1206void
1207pf_tbladdr_remove(struct pf_addr_wrap *aw)
1208{
1209 if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL)
1210 return;
1211 pfr_detach_table(aw->p.tbl);
1212 aw->p.tbl = NULL;
1213}
1214
1215void
1216pf_tbladdr_copyout(struct pf_addr_wrap *aw)
1217{
1218 struct pfr_ktable *kt = aw->p.tbl;
1219
1220 if (aw->type != PF_ADDR_TABLE || kt == NULL)
1221 return;
1222 if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL)
1223 kt = kt->pfrkt_root;
1224 aw->p.tbl = NULL;
1225 aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ?
1226 kt->pfrkt_cnt : -1;
1227}
1228
1229void
1230pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
1231{
1232 switch (af) {
1233#ifdef INET
1234 case AF_INET: {
1235 u_int32_t a = ntohl(addr->addr32[0]);
4b1cf444 1236 kprintf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
02742ec6
JS
1237 (a>>8)&255, a&255);
1238 if (p) {
1239 p = ntohs(p);
4b1cf444 1240 kprintf(":%u", p);
02742ec6
JS
1241 }
1242 break;
1243 }
1244#endif /* INET */
1245#ifdef INET6
1246 case AF_INET6: {
1247 u_int16_t b;
1248 u_int8_t i, curstart = 255, curend = 0,
1249 maxstart = 0, maxend = 0;
1250 for (i = 0; i < 8; i++) {
1251 if (!addr->addr16[i]) {
1252 if (curstart == 255)
1253 curstart = i;
1254 else
1255 curend = i;
1256 } else {
1257 if (curstart) {
1258 if ((curend - curstart) >
1259 (maxend - maxstart)) {
1260 maxstart = curstart;
1261 maxend = curend;
1262 curstart = 255;
1263 }
1264 }
1265 }
1266 }
1267 for (i = 0; i < 8; i++) {
1268 if (i >= maxstart && i <= maxend) {
1269 if (maxend != 7) {
1270 if (i == maxstart)
4b1cf444 1271 kprintf(":");
02742ec6
JS
1272 } else {
1273 if (i == maxend)
4b1cf444 1274 kprintf(":");
02742ec6
JS
1275 }
1276 } else {
1277 b = ntohs(addr->addr16[i]);
4b1cf444 1278 kprintf("%x", b);
02742ec6 1279 if (i < 7)
4b1cf444 1280 kprintf(":");
02742ec6
JS
1281 }
1282 }
1283 if (p) {
1284 p = ntohs(p);
4b1cf444 1285 kprintf("[%u]", p);
02742ec6
JS
1286 }
1287 break;
1288 }
1289#endif /* INET6 */
1290 }
1291}
1292
1293void
1294pf_print_state(struct pf_state *s)
1295{
ed1f0be2
JL
1296 pf_print_state_parts(s, NULL, NULL);
1297}
1298
1299void
1300pf_print_state_parts(struct pf_state *s,
1301 struct pf_state_key *skwp, struct pf_state_key *sksp)
1302{
1303 struct pf_state_key *skw, *sks;
1304 u_int8_t proto, dir;
1305
1306 /* Do our best to fill these, but they're skipped if NULL */
1307 skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL);
1308 sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL);
1309 proto = skw ? skw->proto : (sks ? sks->proto : 0);
1310 dir = s ? s->direction : 0;
1311
1312 switch (proto) {
02742ec6 1313 case IPPROTO_TCP:
4b1cf444 1314 kprintf("TCP ");
02742ec6
JS
1315 break;
1316 case IPPROTO_UDP:
4b1cf444 1317 kprintf("UDP ");
02742ec6
JS
1318 break;
1319 case IPPROTO_ICMP:
4b1cf444 1320 kprintf("ICMP ");
02742ec6
JS
1321 break;
1322 case IPPROTO_ICMPV6:
4b1cf444 1323 kprintf("ICMPV6 ");
02742ec6
JS
1324 break;
1325 default:
ed1f0be2
JL
1326 kprintf("%u ", skw->proto);
1327 break;
1328 }
1329 switch (dir) {
1330 case PF_IN:
1331 kprintf(" in");
1332 break;
1333 case PF_OUT:
1334 kprintf(" out");
02742ec6
JS
1335 break;
1336 }
ed1f0be2
JL
1337 if (skw) {
1338 kprintf(" wire: ");
1339 pf_print_host(&skw->addr[0], skw->port[0], skw->af);
1340 kprintf(" ");
1341 pf_print_host(&skw->addr[1], skw->port[1], skw->af);
1342 }
1343 if (sks) {
1344 kprintf(" stack: ");
1345 if (sks != skw) {
1346 pf_print_host(&sks->addr[0], sks->port[0], sks->af);
1347 kprintf(" ");
1348 pf_print_host(&sks->addr[1], sks->port[1], sks->af);
1349 } else
1350 kprintf("-");
1351 }
1352 if (s) {
1353 if (proto == IPPROTO_TCP) {
1354 kprintf(" [lo=%u high=%u win=%u modulator=%u",
1355 s->src.seqlo, s->src.seqhi,
1356 s->src.max_win, s->src.seqdiff);
1357 if (s->src.wscale && s->dst.wscale)
1358 kprintf(" wscale=%u",
1359 s->src.wscale & PF_WSCALE_MASK);
1360 kprintf("]");
1361 kprintf(" [lo=%u high=%u win=%u modulator=%u",
1362 s->dst.seqlo, s->dst.seqhi,
1363 s->dst.max_win, s->dst.seqdiff);
1364 if (s->src.wscale && s->dst.wscale)
1365 kprintf(" wscale=%u",
1366 s->dst.wscale & PF_WSCALE_MASK);
1367 kprintf("]");
1368 }
1369 kprintf(" %u:%u", s->src.state, s->dst.state);
1370 }
02742ec6
JS
1371}
1372
1373void
1374pf_print_flags(u_int8_t f)
1375{
1376 if (f)
4b1cf444 1377 kprintf(" ");
02742ec6 1378 if (f & TH_FIN)
4b1cf444 1379 kprintf("F");
02742ec6 1380 if (f & TH_SYN)
4b1cf444 1381 kprintf("S");
02742ec6 1382 if (f & TH_RST)
4b1cf444 1383 kprintf("R");
02742ec6 1384 if (f & TH_PUSH)
4b1cf444 1385 kprintf("P");
02742ec6 1386 if (f & TH_ACK)
4b1cf444 1387 kprintf("A");
02742ec6 1388 if (f & TH_URG)
4b1cf444 1389 kprintf("U");
02742ec6 1390 if (f & TH_ECE)
4b1cf444 1391 kprintf("E");
02742ec6 1392 if (f & TH_CWR)
4b1cf444 1393 kprintf("W");
02742ec6
JS
1394}
1395
1396#define PF_SET_SKIP_STEPS(i) \
1397 do { \
1398 while (head[i] != cur) { \
1399 head[i]->skip[i].ptr = cur; \
1400 head[i] = TAILQ_NEXT(head[i], entries); \
1401 } \
1402 } while (0)
1403
1404void
1405pf_calc_skip_steps(struct pf_rulequeue *rules)
1406{
1407 struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
1408 int i;
1409
1410 cur = TAILQ_FIRST(rules);
1411 prev = cur;
1412 for (i = 0; i < PF_SKIP_COUNT; ++i)
1413 head[i] = cur;
1414 while (cur != NULL) {
1415
1416 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
1417 PF_SET_SKIP_STEPS(PF_SKIP_IFP);
1418 if (cur->direction != prev->direction)
1419 PF_SET_SKIP_STEPS(PF_SKIP_DIR);
1420 if (cur->af != prev->af)
1421 PF_SET_SKIP_STEPS(PF_SKIP_AF);
1422 if (cur->proto != prev->proto)
1423 PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
70224baa 1424 if (cur->src.neg != prev->src.neg ||
02742ec6
JS
1425 pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
1426 PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
1427 if (cur->src.port[0] != prev->src.port[0] ||
1428 cur->src.port[1] != prev->src.port[1] ||
1429 cur->src.port_op != prev->src.port_op)
1430 PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
70224baa 1431 if (cur->dst.neg != prev->dst.neg ||
02742ec6
JS
1432 pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
1433 PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
1434 if (cur->dst.port[0] != prev->dst.port[0] ||
1435 cur->dst.port[1] != prev->dst.port[1] ||
1436 cur->dst.port_op != prev->dst.port_op)
1437 PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
1438
1439 prev = cur;
1440 cur = TAILQ_NEXT(cur, entries);
1441 }
1442 for (i = 0; i < PF_SKIP_COUNT; ++i)
1443 PF_SET_SKIP_STEPS(i);
1444}
1445
1446int
1447pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
1448{
1449 if (aw1->type != aw2->type)
1450 return (1);
1451 switch (aw1->type) {
1452 case PF_ADDR_ADDRMASK:
ed1f0be2 1453 case PF_ADDR_RANGE:
02742ec6
JS
1454 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0))
1455 return (1);
1456 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0))
1457 return (1);
1458 return (0);
1459 case PF_ADDR_DYNIFTL:
1460 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
1461 case PF_ADDR_NOROUTE:
70224baa 1462 case PF_ADDR_URPFFAILED:
02742ec6
JS
1463 return (0);
1464 case PF_ADDR_TABLE:
1465 return (aw1->p.tbl != aw2->p.tbl);
70224baa
JL
1466 case PF_ADDR_RTLABEL:
1467 return (aw1->v.rtlabel != aw2->v.rtlabel);
02742ec6 1468 default:
4b1cf444 1469 kprintf("invalid address type: %d\n", aw1->type);
02742ec6
JS
1470 return (1);
1471 }
1472}
1473
02742ec6
JS
1474u_int16_t
1475pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
1476{
1477 u_int32_t l;
1478
1479 if (udp && !cksum)
1480 return (0x0000);
1481 l = cksum + old - new;
1482 l = (l >> 16) + (l & 65535);
1483 l = l & 65535;
1484 if (udp && !l)
1485 return (0xFFFF);
1486 return (l);
1487}
1488
1489void
1490pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc,
1491 struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af)
1492{
1493 struct pf_addr ao;
1494 u_int16_t po = *p;
1495
1496 PF_ACPY(&ao, a, af);
1497 PF_ACPY(a, an, af);
1498
1499 *p = pn;
1500
1501 switch (af) {
1502#ifdef INET
1503 case AF_INET:
1504 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1505 ao.addr16[0], an->addr16[0], 0),
1506 ao.addr16[1], an->addr16[1], 0);
1507 *p = pn;
1508 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1509 ao.addr16[0], an->addr16[0], u),
1510 ao.addr16[1], an->addr16[1], u),
1511 po, pn, u);
1512 break;
1513#endif /* INET */
1514#ifdef INET6
1515 case AF_INET6:
1516 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1517 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1518 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1519 ao.addr16[0], an->addr16[0], u),
1520 ao.addr16[1], an->addr16[1], u),
1521 ao.addr16[2], an->addr16[2], u),
1522 ao.addr16[3], an->addr16[3], u),
1523 ao.addr16[4], an->addr16[4], u),
1524 ao.addr16[5], an->addr16[5], u),
1525 ao.addr16[6], an->addr16[6], u),
1526 ao.addr16[7], an->addr16[7], u),
1527 po, pn, u);
1528 break;
1529#endif /* INET6 */
1530 }
1531}
1532
1533
1534/* Changes a u_int32_t. Uses a void * so there are no align restrictions */
1535void
1536pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
1537{
1538 u_int32_t ao;
1539
1540 memcpy(&ao, a, sizeof(ao));
1541 memcpy(a, &an, sizeof(u_int32_t));
1542 *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
1543 ao % 65536, an % 65536, u);
1544}
1545
1546#ifdef INET6
1547void
1548pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
1549{
1550 struct pf_addr ao;
1551
1552 PF_ACPY(&ao, a, AF_INET6);
1553 PF_ACPY(a, an, AF_INET6);
1554
1555 *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1556 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1557 pf_cksum_fixup(pf_cksum_fixup(*c,
1558 ao.addr16[0], an->addr16[0], u),
1559 ao.addr16[1], an->addr16[1], u),
1560 ao.addr16[2], an->addr16[2], u),
1561 ao.addr16[3], an->addr16[3], u),
1562 ao.addr16[4], an->addr16[4], u),
1563 ao.addr16[5], an->addr16[5], u),
1564 ao.addr16[6], an->addr16[6], u),
1565 ao.addr16[7], an->addr16[7], u);
1566}
1567#endif /* INET6 */
1568
1569void
1570pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
1571 struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
1572 u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
1573{
1574 struct pf_addr oia, ooa;
1575
1576 PF_ACPY(&oia, ia, af);
ed1f0be2
JL
1577 if (oa)
1578 PF_ACPY(&ooa, oa, af);
02742ec6
JS
1579
1580 /* Change inner protocol port, fix inner protocol checksum. */
1581 if (ip != NULL) {
1582 u_int16_t oip = *ip;
1583 u_int32_t opc = 0;
1584
1585 if (pc != NULL)
1586 opc = *pc;
1587 *ip = np;
1588 if (pc != NULL)
1589 *pc = pf_cksum_fixup(*pc, oip, *ip, u);
1590 *ic = pf_cksum_fixup(*ic, oip, *ip, 0);
1591 if (pc != NULL)
1592 *ic = pf_cksum_fixup(*ic, opc, *pc, 0);
1593 }
1594 /* Change inner ip address, fix inner ip and icmp checksums. */
1595 PF_ACPY(ia, na, af);
1596 switch (af) {
1597#ifdef INET
1598 case AF_INET: {
1599 u_int32_t oh2c = *h2c;
1600
1601 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
1602 oia.addr16[0], ia->addr16[0], 0),
1603 oia.addr16[1], ia->addr16[1], 0);
1604 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1605 oia.addr16[0], ia->addr16[0], 0),
1606 oia.addr16[1], ia->addr16[1], 0);
1607 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
1608 break;
1609 }
1610#endif /* INET */
1611#ifdef INET6
1612 case AF_INET6:
1613 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1614 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1615 pf_cksum_fixup(pf_cksum_fixup(*ic,
1616 oia.addr16[0], ia->addr16[0], u),
1617 oia.addr16[1], ia->addr16[1], u),
1618 oia.addr16[2], ia->addr16[2], u),
1619 oia.addr16[3], ia->addr16[3], u),
1620 oia.addr16[4], ia->addr16[4], u),
1621 oia.addr16[5], ia->addr16[5], u),
1622 oia.addr16[6], ia->addr16[6], u),
1623 oia.addr16[7], ia->addr16[7], u);
1624 break;
1625#endif /* INET6 */
1626 }
ed1f0be2
JL
1627 /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */
1628 if (oa) {
1629 PF_ACPY(oa, na, af);
1630 switch (af) {
02742ec6 1631#ifdef INET
ed1f0be2
JL
1632 case AF_INET:
1633 *hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
1634 ooa.addr16[0], oa->addr16[0], 0),
1635 ooa.addr16[1], oa->addr16[1], 0);
1636 break;
02742ec6
JS
1637#endif /* INET */
1638#ifdef INET6
ed1f0be2
JL
1639 case AF_INET6:
1640 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1641 pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1642 pf_cksum_fixup(pf_cksum_fixup(*ic,
1643 ooa.addr16[0], oa->addr16[0], u),
1644 ooa.addr16[1], oa->addr16[1], u),
1645 ooa.addr16[2], oa->addr16[2], u),
1646 ooa.addr16[3], oa->addr16[3], u),
1647 ooa.addr16[4], oa->addr16[4], u),
1648 ooa.addr16[5], oa->addr16[5], u),
1649 ooa.addr16[6], oa->addr16[6], u),
1650 ooa.addr16[7], oa->addr16[7], u);
1651 break;
02742ec6 1652#endif /* INET6 */
ed1f0be2 1653 }
02742ec6
JS
1654 }
1655}
1656
70224baa
JL
1657
1658/*
1659 * Need to modulate the sequence numbers in the TCP SACK option
1660 * (credits to Krzysztof Pfaff for report and patch)
1661 */
1662int
1663pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd,
1664 struct tcphdr *th, struct pf_state_peer *dst)
1665{
1666 int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen;
1667 u_int8_t opts[TCP_MAXOLEN], *opt = opts;
1668 int copyback = 0, i, olen;
1669 struct raw_sackblock sack;
1670
1671#define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2)
1672 if (hlen < TCPOLEN_SACKLEN ||
1673 !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af))
1674 return 0;
1675
1676 while (hlen >= TCPOLEN_SACKLEN) {
1677 olen = opt[1];
1678 switch (*opt) {
1679 case TCPOPT_EOL: /* FALLTHROUGH */
1680 case TCPOPT_NOP:
1681 opt++;
1682 hlen--;
1683 break;
1684 case TCPOPT_SACK:
1685 if (olen > hlen)
1686 olen = hlen;
1687 if (olen >= TCPOLEN_SACKLEN) {
1688 for (i = 2; i + TCPOLEN_SACK <= olen;
1689 i += TCPOLEN_SACK) {
1690 memcpy(&sack, &opt[i], sizeof(sack));
1691 pf_change_a(&sack.rblk_start, &th->th_sum,
4fc5aa1c 1692 htonl(ntohl(sack.rblk_start) -
70224baa
JL
1693 dst->seqdiff), 0);
1694 pf_change_a(&sack.rblk_end, &th->th_sum,
4fc5aa1c 1695 htonl(ntohl(sack.rblk_end) -
70224baa
JL
1696 dst->seqdiff), 0);
1697 memcpy(&opt[i], &sack, sizeof(sack));
1698 }
1699 copyback = 1;
1700 }
1701 /* FALLTHROUGH */
1702 default:
1703 if (olen < 2)
1704 olen = 2;
1705 hlen -= olen;
1706 opt += olen;
1707 }
1708 }
1709
1710 if (copyback)
1711 m_copyback(m, off + sizeof(*th), thoptlen, opts);
1712 return (copyback);
1713}
1714
02742ec6
JS
1715void
1716pf_send_tcp(const struct pf_rule *r, sa_family_t af,
1717 const struct pf_addr *saddr, const struct pf_addr *daddr,
1718 u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
70224baa
JL
1719 u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag,
1720 u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp)
02742ec6
JS
1721{
1722 struct mbuf *m;
1723 int len = 0, tlen;
1724#ifdef INET
1725 struct ip *h = NULL;
1726#endif /* INET */
1727#ifdef INET6
1728 struct ip6_hdr *h6 = NULL;
1729#endif /* INET6 */
1730 struct tcphdr *th = NULL;
70224baa 1731 char *opt;
02742ec6 1732
2a7a2b1c
JL
1733 ASSERT_LWKT_TOKEN_HELD(&pf_token);
1734
02742ec6
JS
1735 /* maximum segment size tcp option */
1736 tlen = sizeof(struct tcphdr);
1737 if (mss)
1738 tlen += 4;
1739
1740 switch (af) {
1741#ifdef INET
1742 case AF_INET:
1743 len = sizeof(struct ip) + tlen;
1744 break;
1745#endif /* INET */
1746#ifdef INET6
1747 case AF_INET6:
1748 len = sizeof(struct ip6_hdr) + tlen;
1749 break;
1750#endif /* INET6 */
1751 }
1752
aa1da187
MD
1753 /*
1754 * Create outgoing mbuf.
1755 *
1756 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
1757 * so make sure pf.flags is clear.
1758 */
02742ec6 1759 m = m_gethdr(MB_DONTWAIT, MT_HEADER);
2a7a2b1c 1760 if (m == NULL) {
02742ec6 1761 return;
2a7a2b1c 1762 }
70224baa 1763 if (tag)
aa1da187
MD
1764 m->m_pkthdr.fw_flags |= PF_MBUF_TAGGED;
1765 m->m_pkthdr.pf.flags = 0;
315a7da3 1766 m->m_pkthdr.pf.tag = rtag;
ed1f0be2
JL
1767 /* XXX Recheck when upgrading to > 4.4 */
1768 m->m_pkthdr.pf.statekey = NULL;
70224baa 1769 if (r != NULL && r->rtableid >= 0)
02dd99a9 1770 m->m_pkthdr.pf.rtableid = r->rtableid;
70224baa 1771
02742ec6
JS
1772#ifdef ALTQ
1773 if (r != NULL && r->qid) {
315a7da3
JL
1774 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
1775 m->m_pkthdr.pf.qid = r->qid;
1776 m->m_pkthdr.pf.ecn_af = af;
1777 m->m_pkthdr.pf.hdr = mtod(m, struct ip *);
02742ec6 1778 }
70224baa 1779#endif /* ALTQ */
02742ec6
JS
1780 m->m_data += max_linkhdr;
1781 m->m_pkthdr.len = m->m_len = len;
1782 m->m_pkthdr.rcvif = NULL;
1783 bzero(m->m_data, len);
1784 switch (af) {
1785#ifdef INET
1786 case AF_INET:
1787 h = mtod(m, struct ip *);
1788
1789 /* IP header fields included in the TCP checksum */
1790 h->ip_p = IPPROTO_TCP;
1791 h->ip_len = tlen;
1792 h->ip_src.s_addr = saddr->v4.s_addr;
1793 h->ip_dst.s_addr = daddr->v4.s_addr;
1794
1795 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
1796 break;
1797#endif /* INET */
1798#ifdef INET6
1799 case AF_INET6:
1800 h6 = mtod(m, struct ip6_hdr *);
1801
1802 /* IP header fields included in the TCP checksum */
1803 h6->ip6_nxt = IPPROTO_TCP;
1804 h6->ip6_plen = htons(tlen);
1805 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
1806 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
1807
1808 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
1809 break;
1810#endif /* INET6 */
1811 }
1812
1813 /* TCP header */
1814 th->th_sport = sport;
1815 th->th_dport = dport;
1816 th->th_seq = htonl(seq);
1817 th->th_ack = htonl(ack);
1818 th->th_off = tlen >> 2;
1819 th->th_flags = flags;
1820 th->th_win = htons(win);
1821
1822 if (mss) {
1823 opt = (char *)(th + 1);
1824 opt[0] = TCPOPT_MAXSEG;
1825 opt[1] = 4;
1826 mss = htons(mss);
1827 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
1828 }
1829
1830 switch (af) {
1831#ifdef INET
1832 case AF_INET:
1833 /* TCP checksum */
1834 th->th_sum = in_cksum(m, len);
1835
1836 /* Finish the IP header */
1837 h->ip_v = 4;
1838 h->ip_hl = sizeof(*h) >> 2;
1839 h->ip_tos = IPTOS_LOWDELAY;
1840 h->ip_len = len;
1841 h->ip_off = path_mtu_discovery ? IP_DF : 0;
1842 h->ip_ttl = ttl ? ttl : ip_defttl;
1843 h->ip_sum = 0;
70224baa 1844 if (eh == NULL) {
2a7a2b1c 1845 lwkt_reltoken(&pf_token);
70224baa 1846 ip_output(m, NULL, NULL, 0, NULL, NULL);
2a7a2b1c 1847 lwkt_gettoken(&pf_token);
70224baa
JL
1848 } else {
1849 struct route ro;
1850 struct rtentry rt;
1851 struct ether_header *e = (void *)ro.ro_dst.sa_data;
1852
1853 if (ifp == NULL) {
1854 m_freem(m);
1855 return;
1856 }
1857 rt.rt_ifp = ifp;
1858 ro.ro_rt = &rt;
1859 ro.ro_dst.sa_len = sizeof(ro.ro_dst);
1860 ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT;
1861 bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN);
1862 bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN);
1863 e->ether_type = eh->ether_type;
1864 /* XXX_IMPORT: later */
2a7a2b1c 1865 lwkt_reltoken(&pf_token);
70224baa
JL
1866 ip_output(m, (void *)NULL, &ro, 0,
1867 (void *)NULL, (void *)NULL);
2a7a2b1c 1868 lwkt_gettoken(&pf_token);
70224baa 1869 }
02742ec6
JS
1870 break;
1871#endif /* INET */
1872#ifdef INET6
1873 case AF_INET6:
1874 /* TCP checksum */
1875 th->th_sum = in6_cksum(m, IPPROTO_TCP,
1876 sizeof(struct ip6_hdr), tlen);
1877
1878 h6->ip6_vfc |= IPV6_VERSION;
1879 h6->ip6_hlim = IPV6_DEFHLIM;
1880
2a7a2b1c 1881 lwkt_reltoken(&pf_token);
02742ec6 1882 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
2a7a2b1c 1883 lwkt_gettoken(&pf_token);
02742ec6
JS
1884 break;
1885#endif /* INET6 */
1886 }
1887}
1888
1889void
1890pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
1891 struct pf_rule *r)
1892{
1893 struct mbuf *m0;
1894
aa1da187
MD
1895 /*
1896 * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
1897 * so make sure pf.flags is clear.
1898 */
ed1f0be2
JL
1899 if ((m0 = m_copy(m, 0, M_COPYALL)) == NULL)
1900 return;
1901
aa1da187
MD
1902 m0->m_pkthdr.fw_flags |= PF_MBUF_TAGGED;
1903 m0->m_pkthdr.pf.flags = 0;
ed1f0be2
JL
1904 /* XXX Re-Check when Upgrading to > 4.4 */
1905 m0->m_pkthdr.pf.statekey = NULL;
70224baa
JL
1906
1907 if (r->rtableid >= 0)
315a7da3 1908 m0->m_pkthdr.pf.rtableid = r->rtableid;
02742ec6
JS
1909
1910#ifdef ALTQ
1911 if (r->qid) {
315a7da3
JL
1912 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
1913 m0->m_pkthdr.pf.qid = r->qid;
1914 m0->m_pkthdr.pf.ecn_af = af;
1915 m0->m_pkthdr.pf.hdr = mtod(m0, struct ip *);
02742ec6 1916 }
70224baa 1917#endif /* ALTQ */
02742ec6
JS
1918
1919 switch (af) {
1920#ifdef INET
1921 case AF_INET:
745a4a5d 1922 icmp_error(m0, type, code, 0, 0);
02742ec6
JS
1923 break;
1924#endif /* INET */
1925#ifdef INET6
1926 case AF_INET6:
1927 icmp6_error(m0, type, code, 0);
1928 break;
1929#endif /* INET6 */
1930 }
1931}
1932
1933/*
1934 * Return 1 if the addresses a and b match (with mask m), otherwise return 0.
1935 * If n is 0, they match if they are equal. If n is != 0, they match if they
1936 * are different.
1937 */
1938int
1939pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
1940 struct pf_addr *b, sa_family_t af)
1941{
1942 int match = 0;
1943
1944 switch (af) {
1945#ifdef INET
1946 case AF_INET:
1947 if ((a->addr32[0] & m->addr32[0]) ==
1948 (b->addr32[0] & m->addr32[0]))
1949 match++;
1950 break;
1951#endif /* INET */
1952#ifdef INET6
1953 case AF_INET6:
1954 if (((a->addr32[0] & m->addr32[0]) ==
1955 (b->addr32[0] & m->addr32[0])) &&
1956 ((a->addr32[1] & m->addr32[1]) ==
1957 (b->addr32[1] & m->addr32[1])) &&
1958 ((a->addr32[2] & m->addr32[2]) ==
1959 (b->addr32[2] & m->addr32[2])) &&
1960 ((a->addr32[3] & m->addr32[3]) ==
1961 (b->addr32[3] & m->addr32[3])))
1962 match++;
1963 break;
1964#endif /* INET6 */
1965 }
1966 if (match) {
1967 if (n)
1968 return (0);
1969 else
1970 return (1);
1971 } else {
1972 if (n)
1973 return (1);
1974 else
1975 return (0);
1976 }
1977}
1978
ed1f0be2
JL
1979/*
1980 * Return 1 if b <= a <= e, otherwise return 0.
1981 */
1982int
1983pf_match_addr_range(struct pf_addr *b, struct pf_addr *e,
1984 struct pf_addr *a, sa_family_t af)
1985{
1986 switch (af) {
1987#ifdef INET
1988 case AF_INET:
1989 if ((a->addr32[0] < b->addr32[0]) ||
1990 (a->addr32[0] > e->addr32[0]))
1991 return (0);
1992 break;
1993#endif /* INET */
1994#ifdef INET6
1995 case AF_INET6: {
1996 int i;
1997
1998 /* check a >= b */
1999 for (i = 0; i < 4; ++i)
2000 if (a->addr32[i] > b->addr32[i])
2001 break;
2002 else if (a->addr32[i] < b->addr32[i])
2003 return (0);
2004 /* check a <= e */
2005 for (i = 0; i < 4; ++i)
2006 if (a->addr32[i] < e->addr32[i])
2007 break;
2008 else if (a->addr32[i] > e->addr32[i])
2009 return (0);
2010 break;
2011 }
2012#endif /* INET6 */
2013 }
2014 return (1);
2015}
2016
02742ec6
JS
2017int
2018pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
2019{
2020 switch (op) {
2021 case PF_OP_IRG:
2022 return ((p > a1) && (p < a2));
2023 case PF_OP_XRG:
2024 return ((p < a1) || (p > a2));
2025 case PF_OP_RRG:
2026 return ((p >= a1) && (p <= a2));
2027 case PF_OP_EQ:
2028 return (p == a1);
2029 case PF_OP_NE:
2030 return (p != a1);
2031 case PF_OP_LT:
2032 return (p < a1);
2033 case PF_OP_LE:
2034 return (p <= a1);
2035 case PF_OP_GT:
2036 return (p > a1);
2037 case PF_OP_GE:
2038 return (p >= a1);
2039 }
2040 return (0); /* never reached */
2041}
2042
2043int
2044pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
2045{
2046 a1 = ntohs(a1);
2047 a2 = ntohs(a2);
2048 p = ntohs(p);
2049 return (pf_match(op, a1, a2, p));
2050}
2051
2052int
2053pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
2054{
2055 if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2056 return (0);
2057 return (pf_match(op, a1, a2, u));
2058}
2059
2060int
2061pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
2062{
2063 if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2064 return (0);
2065 return (pf_match(op, a1, a2, g));
2066}
2067
70224baa 2068int
315a7da3 2069pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag)
70224baa
JL
2070{
2071 if (*tag == -1)
315a7da3 2072 *tag = m->m_pkthdr.pf.tag;
70224baa 2073
02742ec6
JS
2074 return ((!r->match_tag_not && r->match_tag == *tag) ||
2075 (r->match_tag_not && r->match_tag != *tag));
2076}
2077
70224baa 2078int
315a7da3 2079pf_tag_packet(struct mbuf *m, int tag, int rtableid)
02742ec6 2080{
70224baa
JL
2081 if (tag <= 0 && rtableid < 0)
2082 return (0);
2083
70224baa 2084 if (tag > 0)
315a7da3 2085 m->m_pkthdr.pf.tag = tag;
70224baa 2086 if (rtableid >= 0)
315a7da3 2087 m->m_pkthdr.pf.rtableid = rtableid;
02742ec6 2088
70224baa 2089 return (0);
02742ec6
JS
2090}
2091
315a7da3 2092void
70224baa 2093pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n,
ed1f0be2 2094 struct pf_rule **r, struct pf_rule **a, int *match)
70224baa
JL
2095{
2096 struct pf_anchor_stackframe *f;
2097
2098 (*r)->anchor->match = 0;
2099 if (match)
2100 *match = 0;
2101 if (*depth >= sizeof(pf_anchor_stack) /
2102 sizeof(pf_anchor_stack[0])) {
2103 kprintf("pf_step_into_anchor: stack overflow\n");
2104 *r = TAILQ_NEXT(*r, entries);
2105 return;
2106 } else if (*depth == 0 && a != NULL)
2107 *a = *r;
2108 f = pf_anchor_stack + (*depth)++;
2109 f->rs = *rs;
2110 f->r = *r;
2111 if ((*r)->anchor_wildcard) {
2112 f->parent = &(*r)->anchor->children;
2113 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) ==
2114 NULL) {
2115 *r = NULL;
2116 return;
2117 }
2118 *rs = &f->child->ruleset;
2119 } else {
2120 f->parent = NULL;
2121 f->child = NULL;
2122 *rs = &(*r)->anchor->ruleset;
2123 }
2124 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2125}
02742ec6 2126
70224baa
JL
2127int
2128pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n,
2129 struct pf_rule **r, struct pf_rule **a, int *match)
2130{
2131 struct pf_anchor_stackframe *f;
2132 int quick = 0;
2133
2134 do {
2135 if (*depth <= 0)
2136 break;
2137 f = pf_anchor_stack + *depth - 1;
2138 if (f->parent != NULL && f->child != NULL) {
2139 if (f->child->match ||
2140 (match != NULL && *match)) {
2141 f->r->anchor->match = 1;
2142 *match = 0;
2143 }
2144 f->child = RB_NEXT(pf_anchor_node, f->parent, f->child);
2145 if (f->child != NULL) {
2146 *rs = &f->child->ruleset;
2147 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2148 if (*r == NULL)
2149 continue;
2150 else
2151 break;
2152 }
2153 }
2154 (*depth)--;
2155 if (*depth == 0 && a != NULL)
2156 *a = NULL;
2157 *rs = f->rs;
ed1f0be2 2158 if (f->r->anchor->match || (match != NULL && *match))
70224baa
JL
2159 quick = f->r->quick;
2160 *r = TAILQ_NEXT(f->r, entries);
2161 } while (*r == NULL);
2162
2163 return (quick);
2164}
02742ec6
JS
2165
2166#ifdef INET6
2167void
2168pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
2169 struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
2170{
2171 switch (af) {
2172#ifdef INET
2173 case AF_INET:
2174 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2175 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2176 break;
2177#endif /* INET */
2178 case AF_INET6:
2179 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2180 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2181 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
2182 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
2183 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
2184 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
2185 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
2186 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
2187 break;
2188 }
2189}
2190
2191void
2192pf_addr_inc(struct pf_addr *addr, sa_family_t af)
2193{
2194 switch (af) {
2195#ifdef INET
2196 case AF_INET:
2197 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
2198 break;
2199#endif /* INET */
2200 case AF_INET6:
2201 if (addr->addr32[3] == 0xffffffff) {
2202 addr->addr32[3] = 0;
2203 if (addr->addr32[2] == 0xffffffff) {
2204 addr->addr32[2] = 0;
2205 if (addr->addr32[1] == 0xffffffff) {
2206 addr->addr32[1] = 0;
2207 addr->addr32[0] =
2208 htonl(ntohl(addr->addr32[0]) + 1);
2209 } else
2210 addr->addr32[1] =
2211 htonl(ntohl(addr->addr32[1]) + 1);
2212 } else
2213 addr->addr32[2] =
2214 htonl(ntohl(addr->addr32[2]) + 1);
2215 } else
2216 addr->addr32[3] =
2217 htonl(ntohl(addr->addr32[3]) + 1);
2218 break;
2219 }
2220}
2221#endif /* INET6 */
2222
2223#define mix(a,b,c) \
2224 do { \
2225 a -= b; a -= c; a ^= (c >> 13); \
2226 b -= c; b -= a; b ^= (a << 8); \
2227 c -= a; c -= b; c ^= (b >> 13); \
2228 a -= b; a -= c; a ^= (c >> 12); \
2229 b -= c; b -= a; b ^= (a << 16); \
2230 c -= a; c -= b; c ^= (b >> 5); \
2231 a -= b; a -= c; a ^= (c >> 3); \
2232 b -= c; b -= a; b ^= (a << 10); \
2233 c -= a; c -= b; c ^= (b >> 15); \
2234 } while (0)
2235
2236/*
2237 * hash function based on bridge_hash in if_bridge.c
2238 */
2239void
2240pf_hash(struct pf_addr *inaddr, struct pf_addr *hash,
2241 struct pf_poolhashkey *key, sa_family_t af)
2242{
2243 u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0];
2244
2245 switch (af) {
2246#ifdef INET
2247 case AF_INET:
2248 a += inaddr->addr32[0];
2249 b += key->key32[1];
2250 mix(a, b, c);
2251 hash->addr32[0] = c + key->key32[2];
2252 break;
2253#endif /* INET */
2254#ifdef INET6
2255 case AF_INET6:
2256 a += inaddr->addr32[0];
2257 b += inaddr->addr32[2];
2258 mix(a, b, c);
2259 hash->addr32[0] = c;
2260 a += inaddr->addr32[1];
2261 b += inaddr->addr32[3];
2262 c += key->key32[1];
2263 mix(a, b, c);
2264 hash->addr32[1] = c;
2265 a += inaddr->addr32[2];
2266 b += inaddr->addr32[1];
2267 c += key->key32[2];
2268 mix(a, b, c);
2269 hash->addr32[2] = c;
2270 a += inaddr->addr32[3];
2271 b += inaddr->addr32[0];
2272 c += key->key32[3];
2273 mix(a, b, c);
2274 hash->addr32[3] = c;
2275 break;
2276#endif /* INET6 */
2277 }
2278}
2279
2280int
2281pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr,
2282 struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn)
2283{
2284 unsigned char hash[16];
2285 struct pf_pool *rpool = &r->rpool;
2286 struct pf_addr *raddr = &rpool->cur->addr.v.a.addr;
2287 struct pf_addr *rmask = &rpool->cur->addr.v.a.mask;
2288 struct pf_pooladdr *acur = rpool->cur;
2289 struct pf_src_node k;
2290
2291 if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR &&
2292 (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
2293 k.af = af;
2294 PF_ACPY(&k.addr, saddr, af);
2295 if (r->rule_flag & PFRULE_RULESRCTRACK ||
2296 r->rpool.opts & PF_POOL_STICKYADDR)
2297 k.rule.ptr = r;
2298 else
2299 k.rule.ptr = NULL;
2300 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
2301 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
2302 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) {
2303 PF_ACPY(naddr, &(*sn)->raddr, af);
2304 if (pf_status.debug >= PF_DEBUG_MISC) {
4b1cf444 2305 kprintf("pf_map_addr: src tracking maps ");
02742ec6 2306 pf_print_host(&k.addr, 0, af);
4b1cf444 2307 kprintf(" to ");
02742ec6 2308 pf_print_host(naddr, 0, af);
4b1cf444 2309 kprintf("\n");
02742ec6
JS
2310 }
2311 return (0);
2312 }
2313 }
2314
2315 if (rpool->cur->addr.type == PF_ADDR_NOROUTE)
2316 return (1);
2317 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
70224baa
JL
2318 switch (af) {
2319#ifdef INET
2320 case AF_INET:
02742ec6
JS
2321 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
2322 (rpool->opts & PF_POOL_TYPEMASK) !=
2323 PF_POOL_ROUNDROBIN)
2324 return (1);
2325 raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
2326 rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
70224baa
JL
2327 break;
2328#endif /* INET */
2329#ifdef INET6
2330 case AF_INET6:
02742ec6
JS
2331 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
2332 (rpool->opts & PF_POOL_TYPEMASK) !=
2333 PF_POOL_ROUNDROBIN)
2334 return (1);
2335 raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
2336 rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
70224baa
JL
2337 break;
2338#endif /* INET6 */
02742ec6
JS
2339 }
2340 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
2341 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN)
2342 return (1); /* unsupported */
2343 } else {
2344 raddr = &rpool->cur->addr.v.a.addr;
2345 rmask = &rpool->cur->addr.v.a.mask;
2346 }
2347
2348 switch (rpool->opts & PF_POOL_TYPEMASK) {
2349 case PF_POOL_NONE:
2350 PF_ACPY(naddr, raddr, af);
2351 break;
2352 case PF_POOL_BITMASK:
2353 PF_POOLMASK(naddr, raddr, rmask, saddr, af);
2354 break;
2355 case PF_POOL_RANDOM:
2356 if (init_addr != NULL && PF_AZERO(init_addr, af)) {
2357 switch (af) {
2358#ifdef INET
2359 case AF_INET:
4fc5aa1c 2360 rpool->counter.addr32[0] = htonl(karc4random());
02742ec6
JS
2361 break;
2362#endif /* INET */
2363#ifdef INET6
2364 case AF_INET6:
2365 if (rmask->addr32[3] != 0xffffffff)
70224baa 2366 rpool->counter.addr32[3] =
4fc5aa1c 2367 htonl(karc4random());
02742ec6
JS
2368 else
2369 break;
2370 if (rmask->addr32[2] != 0xffffffff)
70224baa 2371 rpool->counter.addr32[2] =
4fc5aa1c 2372 htonl(karc4random());
02742ec6
JS
2373 else
2374 break;
2375 if (rmask->addr32[1] != 0xffffffff)
70224baa 2376 rpool->counter.addr32[1] =
4fc5aa1c 2377 htonl(karc4random());
02742ec6
JS
2378 else
2379 break;
2380 if (rmask->addr32[0] != 0xffffffff)
70224baa 2381 rpool->counter.addr32[0] =
4fc5aa1c 2382 htonl(karc4random());
02742ec6
JS
2383 break;
2384#endif /* INET6 */
2385 }
2386 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
2387 PF_ACPY(init_addr, naddr, af);
2388
2389 } else {
2390 PF_AINC(&rpool->counter, af);
2391 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
2392 }
2393 break;
2394 case PF_POOL_SRCHASH:
2395 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af);
2396 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af);
2397 break;
2398 case PF_POOL_ROUNDROBIN:
2399 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
2400 if (!pfr_pool_get(rpool->cur->addr.p.tbl,
2401 &rpool->tblidx, &rpool->counter,
2402 &raddr, &rmask, af))
2403 goto get_addr;
2404 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
2405 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
2406 &rpool->tblidx, &rpool->counter,
2407 &raddr, &rmask, af))
2408 goto get_addr;
2409 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
2410 goto get_addr;
2411
2412 try_next:
2413 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL)
2414 rpool->cur = TAILQ_FIRST(&rpool->list);
2415 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
2416 rpool->tblidx = -1;
2417 if (pfr_pool_get(rpool->cur->addr.p.tbl,
2418 &rpool->tblidx, &rpool->counter,
2419 &raddr, &rmask, af)) {
2420 /* table contains no address of type 'af' */
2421 if (rpool->cur != acur)
2422 goto try_next;
2423 return (1);
2424 }
2425 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
2426 rpool->tblidx = -1;
2427 if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
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 {
2436 raddr = &rpool->cur->addr.v.a.addr;
2437 rmask = &rpool->cur->addr.v.a.mask;
2438 PF_ACPY(&rpool->counter, raddr, af);
2439 }
2440
2441 get_addr:
2442 PF_ACPY(naddr, &rpool->counter, af);
70224baa
JL
2443 if (init_addr != NULL && PF_AZERO(init_addr, af))
2444 PF_ACPY(init_addr, naddr, af);
02742ec6
JS
2445 PF_AINC(&rpool->counter, af);
2446 break;
2447 }
2448 if (*sn != NULL)
2449 PF_ACPY(&(*sn)->raddr, naddr, af);
2450
2451 if (pf_status.debug >= PF_DEBUG_MISC &&
2452 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
4b1cf444 2453 kprintf("pf_map_addr: selected address ");
02742ec6 2454 pf_print_host(naddr, 0, af);
4b1cf444 2455 kprintf("\n");
02742ec6
JS
2456 }
2457
2458 return (0);
2459}
2460
2461int
2462pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r,
2463 struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport,
2464 struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high,
2465 struct pf_src_node **sn)
2466{
315a7da3 2467 struct pf_state_key_cmp key;
02742ec6
JS
2468 struct pf_addr init_addr;
2469 u_int16_t cut;
2470
2471 bzero(&init_addr, sizeof(init_addr));
2472 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
2473 return (1);
2474
70224baa
JL
2475 if (proto == IPPROTO_ICMP) {
2476 low = 1;
2477 high = 65535;
2478 }
2479
02742ec6
JS
2480 do {
2481 key.af = af;
2482 key.proto = proto;
ed1f0be2
JL
2483 PF_ACPY(&key.addr[1], daddr, key.af);
2484 PF_ACPY(&key.addr[0], naddr, key.af);
2485 key.port[1] = dport;
02742ec6
JS
2486
2487 /*
2488 * port search; start random, step;
2489 * similar 2 portloop in in_pcbbind
2490 */
70224baa
JL
2491 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP ||
2492 proto == IPPROTO_ICMP)) {
ed1f0be2
JL
2493 key.port[0] = dport;
2494 if (pf_find_state_all(&key, PF_IN, NULL) == NULL)
02742ec6
JS
2495 return (0);
2496 } else if (low == 0 && high == 0) {
ed1f0be2
JL
2497 key.port[0] = *nport;
2498 if (pf_find_state_all(&key, PF_IN, NULL) == NULL)
02742ec6
JS
2499 return (0);
2500 } else if (low == high) {
ed1f0be2
JL
2501 key.port[0] = htons(low);
2502 if (pf_find_state_all(&key, PF_IN, NULL) == NULL) {
02742ec6
JS
2503 *nport = htons(low);
2504 return (0);
2505 }
2506 } else {
2507 u_int16_t tmp;
2508
2509 if (low > high) {
2510 tmp = low;
2511 low = high;
2512 high = tmp;
2513 }
2514 /* low < high */
4fc5aa1c 2515 cut = htonl(karc4random()) % (1 + high - low) + low;
02742ec6
JS
2516 /* low <= cut <= high */
2517 for (tmp = cut; tmp <= high; ++(tmp)) {
ed1f0be2
JL
2518 key.port[0] = htons(tmp);
2519 if (pf_find_state_all(&key, PF_IN, NULL) ==
2520 NULL && !in_baddynamic(tmp, proto)) {
02742ec6
JS
2521 *nport = htons(tmp);
2522 return (0);
2523 }
2524 }
2525 for (tmp = cut - 1; tmp >= low; --(tmp)) {
ed1f0be2
JL
2526 key.port[0] = htons(tmp);
2527 if (pf_find_state_all(&key, PF_IN, NULL) ==
2528 NULL && !in_baddynamic(tmp, proto)) {
02742ec6
JS
2529 *nport = htons(tmp);
2530 return (0);
2531 }
2532 }
2533 }
2534
2535 switch (r->rpool.opts & PF_POOL_TYPEMASK) {
2536 case PF_POOL_RANDOM:
2537 case PF_POOL_ROUNDROBIN:
2538 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
2539 return (1);
2540 break;
2541 case PF_POOL_NONE:
2542 case PF_POOL_SRCHASH:
2543 case PF_POOL_BITMASK:
2544 default:
2545 return (1);
2546 }
2547 } while (! PF_AEQ(&init_addr, naddr, af) );
02742ec6
JS
2548 return (1); /* none available */
2549}
2550
2551struct pf_rule *
2552pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
2553 int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport,
2554 struct pf_addr *daddr, u_int16_t dport, int rs_num)
2555{
70224baa 2556 struct pf_rule *r, *rm = NULL;
02742ec6 2557 struct pf_ruleset *ruleset = NULL;
70224baa
JL
2558 int tag = -1;
2559 int rtableid = -1;
2560 int asd = 0;
02742ec6
JS
2561
2562 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr);
2563 while (r && rm == NULL) {
2564 struct pf_rule_addr *src = NULL, *dst = NULL;
2565 struct pf_addr_wrap *xdst = NULL;
2566
2567 if (r->action == PF_BINAT && direction == PF_IN) {
2568 src = &r->dst;
2569 if (r->rpool.cur != NULL)
2570 xdst = &r->rpool.cur->addr;
2571 } else {
2572 src = &r->src;
2573 dst = &r->dst;
2574 }
2575
2576 r->evaluations++;
70224baa 2577 if (pfi_kif_match(r->kif, kif) == r->ifnot)
02742ec6
JS
2578 r = r->skip[PF_SKIP_IFP].ptr;
2579 else if (r->direction && r->direction != direction)
2580 r = r->skip[PF_SKIP_DIR].ptr;
2581 else if (r->af && r->af != pd->af)
2582 r = r->skip[PF_SKIP_AF].ptr;
2583 else if (r->proto && r->proto != pd->proto)
2584 r = r->skip[PF_SKIP_PROTO].ptr;
70224baa
JL
2585 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af,
2586 src->neg, kif))
02742ec6
JS
2587 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR :
2588 PF_SKIP_DST_ADDR].ptr;
2589 else if (src->port_op && !pf_match_port(src->port_op,
2590 src->port[0], src->port[1], sport))
2591 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT :
2592 PF_SKIP_DST_PORT].ptr;
2593 else if (dst != NULL &&
70224baa 2594 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL))
02742ec6 2595 r = r->skip[PF_SKIP_DST_ADDR].ptr;
70224baa
JL
2596 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af,
2597 0, NULL))
02742ec6
JS
2598 r = TAILQ_NEXT(r, entries);
2599 else if (dst != NULL && dst->port_op &&
2600 !pf_match_port(dst->port_op, dst->port[0],
2601 dst->port[1], dport))
2602 r = r->skip[PF_SKIP_DST_PORT].ptr;
315a7da3 2603 else if (r->match_tag && !pf_match_tag(m, r, &tag))
70224baa 2604 r = TAILQ_NEXT(r, entries);
02742ec6
JS
2605 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto !=
2606 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m,
2607 off, pd->hdr.tcp), r->os_fingerprint)))
2608 r = TAILQ_NEXT(r, entries);
70224baa
JL
2609 else {
2610 if (r->tag)
2611 tag = r->tag;
2612 if (r->rtableid >= 0)
2613 rtableid = r->rtableid;
2614 if (r->anchor == NULL) {
02742ec6 2615 rm = r;
70224baa
JL
2616 } else
2617 pf_step_into_anchor(&asd, &ruleset, rs_num,
2618 &r, NULL, NULL);
2619 }
2620 if (r == NULL)
2621 pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r,
2622 NULL, NULL);
02742ec6 2623 }
315a7da3 2624 if (pf_tag_packet(m, tag, rtableid))
70224baa 2625 return (NULL);
02742ec6
JS
2626 if (rm != NULL && (rm->action == PF_NONAT ||
2627 rm->action == PF_NORDR || rm->action == PF_NOBINAT))
2628 return (NULL);
2629 return (rm);
2630}
2631
2632struct pf_rule *
2633pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction,
2634 struct pfi_kif *kif, struct pf_src_node **sn,
ed1f0be2
JL
2635 struct pf_state_key **skw, struct pf_state_key **sks,
2636 struct pf_state_key **skp, struct pf_state_key **nkp,
2637 struct pf_addr *saddr, struct pf_addr *daddr,
2638 u_int16_t sport, u_int16_t dport)
02742ec6
JS
2639{
2640 struct pf_rule *r = NULL;
2641
ed1f0be2 2642
02742ec6
JS
2643 if (direction == PF_OUT) {
2644 r = pf_match_translation(pd, m, off, direction, kif, saddr,
2645 sport, daddr, dport, PF_RULESET_BINAT);
2646 if (r == NULL)
2647 r = pf_match_translation(pd, m, off, direction, kif,
2648 saddr, sport, daddr, dport, PF_RULESET_NAT);
2649 } else {
2650 r = pf_match_translation(pd, m, off, direction, kif, saddr,
2651 sport, daddr, dport, PF_RULESET_RDR);
2652 if (r == NULL)
2653 r = pf_match_translation(pd, m, off, direction, kif,
2654 saddr, sport, daddr, dport, PF_RULESET_BINAT);
2655 }
2656
2657 if (r != NULL) {
ed1f0be2
JL
2658 struct pf_addr *naddr;
2659 u_int16_t *nport;
2660
2661 if (pf_state_key_setup(pd, r, skw, sks, skp, nkp,
2662 saddr, daddr, sport, dport))
2663 return r;
2664
2665 /* XXX We only modify one side for now. */
2666 naddr = &(*nkp)->addr[1];
2667 nport = &(*nkp)->port[1];
2668
02742ec6
JS
2669 switch (r->action) {
2670 case PF_NONAT:
2671 case PF_NOBINAT:
2672 case PF_NORDR:
2673 return (NULL);
2674 case PF_NAT:
2675 if (pf_get_sport(pd->af, pd->proto, r, saddr,
2676 daddr, dport, naddr, nport, r->rpool.proxy_port[0],
2677 r->rpool.proxy_port[1], sn)) {
2678 DPFPRINTF(PF_DEBUG_MISC,
2679 ("pf: NAT proxy port allocation "
2680 "(%u-%u) failed\n",
2681 r->rpool.proxy_port[0],
2682 r->rpool.proxy_port[1]));
2683 return (NULL);
2684 }
2685 break;
2686 case PF_BINAT:
2687 switch (direction) {
2688 case PF_OUT:
2689 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){
70224baa
JL
2690 switch (pd->af) {
2691#ifdef INET
2692 case AF_INET:
02742ec6
JS
2693 if (r->rpool.cur->addr.p.dyn->
2694 pfid_acnt4 < 1)
2695 return (NULL);
2696 PF_POOLMASK(naddr,
2697 &r->rpool.cur->addr.p.dyn->
2698 pfid_addr4,
2699 &r->rpool.cur->addr.p.dyn->
2700 pfid_mask4,
2701 saddr, AF_INET);
70224baa
JL
2702 break;
2703#endif /* INET */
2704#ifdef INET6
2705 case AF_INET6:
02742ec6
JS
2706 if (r->rpool.cur->addr.p.dyn->
2707 pfid_acnt6 < 1)
2708 return (NULL);
2709 PF_POOLMASK(naddr,
2710 &r->rpool.cur->addr.p.dyn->
2711 pfid_addr6,
2712 &r->rpool.cur->addr.p.dyn->
2713 pfid_mask6,
2714 saddr, AF_INET6);
70224baa
JL
2715 break;
2716#endif /* INET6 */
02742ec6
JS
2717 }
2718 } else
2719 PF_POOLMASK(naddr,
2720 &r->rpool.cur->addr.v.a.addr,
2721 &r->rpool.cur->addr.v.a.mask,
2722 saddr, pd->af);
2723 break;
2724 case PF_IN:
70224baa
JL
2725 if (r->src.addr.type == PF_ADDR_DYNIFTL) {
2726 switch (pd->af) {
2727#ifdef INET
2728 case AF_INET:
02742ec6
JS
2729 if (r->src.addr.p.dyn->
2730 pfid_acnt4 < 1)
2731 return (NULL);
2732 PF_POOLMASK(naddr,
2733 &r->src.addr.p.dyn->
2734 pfid_addr4,
2735 &r->src.addr.p.dyn->
2736 pfid_mask4,
2737 daddr, AF_INET);
70224baa
JL
2738 break;
2739#endif /* INET */
2740#ifdef INET6
2741 case AF_INET6:
02742ec6
JS
2742 if (r->src.addr.p.dyn->
2743 pfid_acnt6 < 1)
2744 return (NULL);
2745 PF_POOLMASK(naddr,
2746 &r->src.addr.p.dyn->
2747 pfid_addr6,
2748 &r->src.addr.p.dyn->
2749 pfid_mask6,
2750 daddr, AF_INET6);
70224baa
JL
2751 break;
2752#endif /* INET6 */
02742ec6
JS
2753 }
2754 } else
2755 PF_POOLMASK(naddr,
2756 &r->src.addr.v.a.addr,
2757 &r->src.addr.v.a.mask, daddr,
2758 pd->af);
2759 break;
2760 }
2761 break;
2762 case PF_RDR: {
70224baa 2763 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn))
02742ec6 2764 return (NULL);
70224baa
JL
2765 if ((r->rpool.opts & PF_POOL_TYPEMASK) ==
2766 PF_POOL_BITMASK)
2767 PF_POOLMASK(naddr, naddr,
2768 &r->rpool.cur->addr.v.a.mask, daddr,
2769 pd->af);
315a7da3 2770
02742ec6
JS
2771 if (r->rpool.proxy_port[1]) {
2772 u_int32_t tmp_nport;
2773
2774 tmp_nport = ((ntohs(dport) -
2775 ntohs(r->dst.port[0])) %
2776 (r->rpool.proxy_port[1] -
2777 r->rpool.proxy_port[0] + 1)) +
2778 r->rpool.proxy_port[0];
2779
2780 /* wrap around if necessary */
2781 if (tmp_nport > 65535)
2782 tmp_nport -= 65535;
2783 *nport = htons((u_int16_t)tmp_nport);
2784 } else if (r->rpool.proxy_port[0])
2785 *nport = htons(r->rpool.proxy_port[0]);
2786 break;
2787 }
2788 default:
2789 return (NULL);
2790 }
2791 }
2792
2793 return (r);
2794}
2795
2796#ifdef SMP
2797struct netmsg_hashlookup {
002c1265 2798 struct netmsg_base base;
02742ec6
JS
2799 struct inpcb **nm_pinp;
2800 struct inpcbinfo *nm_pcbinfo;
2801 struct pf_addr *nm_saddr;
2802 struct pf_addr *nm_daddr;
2803 uint16_t nm_sport;
2804 uint16_t nm_dport;
2805 sa_family_t nm_af;
2806};
2807
4599cf19 2808static void
002c1265 2809in_pcblookup_hash_handler(netmsg_t msg)
02742ec6 2810{
002c1265 2811 struct netmsg_hashlookup *rmsg = (struct netmsg_hashlookup *)msg;
02742ec6 2812
002c1265
MD
2813 if (rmsg->nm_af == AF_INET)
2814 *rmsg->nm_pinp = in_pcblookup_hash(rmsg->nm_pcbinfo,
2815 rmsg->nm_saddr->v4, rmsg->nm_sport, rmsg->nm_daddr->v4,
2816 rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL);
02742ec6
JS
2817#ifdef INET6
2818 else
002c1265
MD
2819 *rmsg->nm_pinp = in6_pcblookup_hash(rmsg->nm_pcbinfo,
2820 &rmsg->nm_saddr->v6, rmsg->nm_sport, &rmsg->nm_daddr->v6,
2821 rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL);
02742ec6 2822#endif /* INET6 */
002c1265 2823 lwkt_replymsg(&rmsg->base.lmsg, 0);
02742ec6
JS
2824}
2825#endif /* SMP */
2826
2827int
315a7da3 2828pf_socket_lookup(int direction, struct pf_pdesc *pd)
02742ec6
JS
2829{
2830 struct pf_addr *saddr, *daddr;
2831 u_int16_t sport, dport;
2832 struct inpcbinfo *pi;
2833 struct inpcb *inp;
2834#ifdef SMP
2835 struct netmsg_hashlookup *msg = NULL;
2836#endif
2837 int pi_cpu = 0;
2838
70224baa
JL
2839 if (pd == NULL)
2840 return (-1);
2841 pd->lookup.uid = UID_MAX;
2842 pd->lookup.gid = GID_MAX;
2843 pd->lookup.pid = NO_PID;
02742ec6
JS
2844 if (direction == PF_IN) {
2845 saddr = pd->src;
2846 daddr = pd->dst;
2847 } else {
2848 saddr = pd->dst;
2849 daddr = pd->src;
2850 }
2851 switch (pd->proto) {
2852 case IPPROTO_TCP:
315a7da3
JL
2853 if (pd->hdr.tcp == NULL)
2854 return (-1);
02742ec6
JS
2855 sport = pd->hdr.tcp->th_sport;
2856 dport = pd->hdr.tcp->th_dport;
2857
2858 pi_cpu = tcp_addrcpu(saddr->v4.s_addr, sport, daddr->v4.s_addr, dport);
2859 pi = &tcbinfo[pi_cpu];
2860#ifdef SMP
2861 /*
2862 * Our netstack runs lockless on MP systems
2863 * (only for TCP connections at the moment).
2864 *
2865 * As we are not allowed to read another CPU's tcbinfo,
2866 * we have to ask that CPU via remote call to search the
2867 * table for us.
2868 *
2869 * Prepare a msg iff data belongs to another CPU.
2870 */
2871 if (pi_cpu != mycpu->gd_cpuid) {
efda3bd0 2872 msg = kmalloc(sizeof(*msg), M_LWKTMSG, M_INTWAIT);
002c1265 2873 netmsg_init(&msg->base, NULL, &netisr_afree_rport,
48e7b118 2874 0, in_pcblookup_hash_handler);
02742ec6
JS
2875 msg->nm_pinp = &inp;
2876 msg->nm_pcbinfo = pi;
2877 msg->nm_saddr = saddr;
2878 msg->nm_sport = sport;
2879 msg->nm_daddr = daddr;
2880 msg->nm_dport = dport;
2881 msg->nm_af = pd->af;
2882 }
2883#endif /* SMP */
2884 break;
2885 case IPPROTO_UDP:
315a7da3
JL
2886 if (pd->hdr.udp == NULL)
2887 return (-1);
02742ec6
JS
2888 sport = pd->hdr.udp->uh_sport;
2889 dport = pd->hdr.udp->uh_dport;
2890 pi = &udbinfo;
2891 break;
2892 default:
315a7da3 2893 return (-1);
02742ec6
JS
2894 }
2895 if (direction != PF_IN) {
2896 u_int16_t p;
2897
2898 p = sport;
2899 sport = dport;
2900 dport = p;
2901 }
2902 switch (pd->af) {
2903#ifdef INET6
2904 case AF_INET6:
2905#ifdef SMP
2906 /*
2907 * Query other CPU, second part
2908 *
2909 * msg only gets initialized when:
2910 * 1) packet is TCP
2911 * 2) the info belongs to another CPU
2912 *
2913 * Use some switch/case magic to avoid code duplication.
2914 */
2915 if (msg == NULL)
2916#endif /* SMP */
2917 {
2918 inp = in6_pcblookup_hash(pi, &saddr->v6, sport,
2919 &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL);
2920
2921 if (inp == NULL)
70224baa 2922 return (-1);
02742ec6
JS
2923 break;
2924 }
2925 /* FALLTHROUGH if SMP and on other CPU */
2926#endif /* INET6 */
2927 case AF_INET:
2928#ifdef SMP
2929 if (msg != NULL) {
2a7a2b1c 2930 lwkt_domsg(cpu_portfn(pi_cpu),
002c1265 2931 &msg->base.lmsg, 0);
02742ec6
JS
2932 } else
2933#endif /* SMP */
2934 {
2935 inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4,
2936 dport, INPLOOKUP_WILDCARD, NULL);
2937 }
2938 if (inp == NULL)
315a7da3 2939 return (-1);
02742ec6
JS
2940 break;
2941
2942 default:
70224baa 2943 return (-1);
02742ec6 2944 }
70224baa
JL
2945 pd->lookup.uid = inp->inp_socket->so_cred->cr_uid;
2946 pd->lookup.gid = inp->inp_socket->so_cred->cr_groups[0];
02742ec6
JS
2947 return (1);
2948}
2949
2950u_int8_t
2951pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
2952{
2953 int hlen;
2954 u_int8_t hdr[60];
2955 u_int8_t *opt, optlen;
2956 u_int8_t wscale = 0;
2957
2958 hlen = th_off << 2; /* hlen <= sizeof(hdr) */
2959 if (hlen <= sizeof(struct tcphdr))
2960 return (0);
2961 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
2962 return (0);
2963 opt = hdr + sizeof(struct tcphdr);
2964 hlen -= sizeof(struct tcphdr);
2965 while (hlen >= 3) {
2966 switch (*opt) {
2967 case TCPOPT_EOL:
2968 case TCPOPT_NOP:
2969 ++opt;
2970 --hlen;
2971 break;
2972 case TCPOPT_WINDOW:
2973 wscale = opt[2];
2974 if (wscale > TCP_MAX_WINSHIFT)
2975 wscale = TCP_MAX_WINSHIFT;
2976 wscale |= PF_WSCALE_FLAG;
2977 /* FALLTHROUGH */
2978 default:
2979 optlen = opt[1];
2980 if (optlen < 2)
2981 optlen = 2;
2982 hlen -= optlen;
2983 opt += optlen;
2984 break;
2985 }
2986 }
2987 return (wscale);
2988}
2989
2990u_int16_t
2991pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
2992{
2993 int hlen;
2994 u_int8_t hdr[60];
2995 u_int8_t *opt, optlen;
2996 u_int16_t mss = tcp_mssdflt;
2997
2998 hlen = th_off << 2; /* hlen <= sizeof(hdr) */
2999 if (hlen <= sizeof(struct tcphdr))
3000 return (0);
3001 if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
3002 return (0);
3003 opt = hdr + sizeof(struct tcphdr);
3004 hlen -= sizeof(struct tcphdr);
3005 while (hlen >= TCPOLEN_MAXSEG) {
3006 switch (*opt) {
3007 case TCPOPT_EOL:
3008 case TCPOPT_NOP:
3009 ++opt;
3010 --hlen;
3011 break;
3012 case TCPOPT_MAXSEG:
3013 bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
3014 /* FALLTHROUGH */
3015 default:
3016 optlen = opt[1];
3017 if (optlen < 2)
3018 optlen = 2;
3019 hlen -= optlen;
3020 opt += optlen;
3021 break;
3022 }
3023 }
3024 return (mss);
3025}
3026
3027u_int16_t
3028pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer)
3029{
3030#ifdef INET
3031 struct sockaddr_in *dst;
3032 struct route ro;
3033#endif /* INET */
3034#ifdef INET6
3035 struct sockaddr_in6 *dst6;
3036 struct route_in6 ro6;
3037#endif /* INET6 */
3038 struct rtentry *rt = NULL;
3039 int hlen = 0;
3040 u_int16_t mss = tcp_mssdflt;
3041
3042 switch (af) {
3043#ifdef INET
3044 case AF_INET:
3045 hlen = sizeof(struct ip);
3046 bzero(&ro, sizeof(ro));
3047 dst = (struct sockaddr_in *)&ro.ro_dst;
3048 dst->sin_family = AF_INET;
3049 dst->sin_len = sizeof(*dst);
3050 dst->sin_addr = addr->v4;
3051 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING));
3052 rt = ro.ro_rt;
3053 break;
3054#endif /* INET */
3055#ifdef INET6
3056 case AF_INET6:
3057 hlen = sizeof(struct ip6_hdr);
3058 bzero(&ro6, sizeof(ro6));
3059 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst;
3060 dst6->sin6_family = AF_INET6;
3061 dst6->sin6_len = sizeof(*dst6);
3062 dst6->sin6_addr = addr->v6;
3063 rtalloc_ign((struct route *)&ro6, (RTF_CLONING | RTF_PRCLONING));
3064 rt = ro6.ro_rt;
3065 break;
3066#endif /* INET6 */
3067 }
3068
3069 if (rt && rt->rt_ifp) {
3070 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr);
3071 mss = max(tcp_mssdflt, mss);
3072 RTFREE(rt);
3073 }
3074 mss = min(mss, offer);
3075 mss = max(mss, 64); /* sanity - at least max opt space */
3076 return (mss);
3077}
3078
3079void
3080pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr)
3081{
3082 struct pf_rule *r = s->rule.ptr;
3083
3084 s->rt_kif = NULL;
3085 if (!r->rt || r->rt == PF_FASTROUTE)
3086 return;
ed1f0be2 3087 switch (s->key[PF_SK_WIRE]->af) {
02742ec6
JS
3088#ifdef INET
3089 case AF_INET:
3090 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL,
3091 &s->nat_src_node);
3092 s->rt_kif = r->rpool.cur->kif;
3093 break;
3094#endif /* INET */
3095#ifdef INET6
3096 case AF_INET6:
3097 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL,
3098 &s->nat_src_node);
3099 s->rt_kif = r->rpool.cur->kif;
3100 break;
3101#endif /* INET6 */
3102 }
3103}
3104
ed1f0be2
JL
3105u_int32_t
3106pf_tcp_iss(struct pf_pdesc *pd)
315a7da3 3107{
ed1f0be2
JL
3108 MD5_CTX ctx;
3109 u_int32_t digest[4];
3110
3111 if (pf_tcp_secret_init == 0) {
3112 karc4rand(pf_tcp_secret, sizeof(pf_tcp_secret));
3113 MD5Init(&pf_tcp_secret_ctx);
3114 MD5Update(&pf_tcp_secret_ctx, pf_tcp_secret,
3115 sizeof(pf_tcp_secret));
3116 pf_tcp_secret_init = 1;
3117 }
3118 ctx = pf_tcp_secret_ctx;
3119
3120 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short));
3121 MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short));
3122 if (pd->af == AF_INET6) {
3123 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr));
3124 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr));
3125 } else {
3126 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr));
3127 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr));
315a7da3 3128 }
ed1f0be2
JL
3129 MD5Final((u_char *)digest, &ctx);
3130 pf_tcp_iss_off += 4096;
3131 return (digest[0] + pd->hdr.tcp->th_seq + pf_tcp_iss_off);
315a7da3
JL
3132}
3133
02742ec6 3134int
315a7da3 3135pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction,
02742ec6 3136 struct pfi_kif *kif, struct mbuf *m, int off, void *h,
70224baa
JL
3137 struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm,
3138 struct ifqueue *ifq, struct inpcb *inp)
02742ec6
JS
3139{
3140 struct pf_rule *nr = NULL;
3141 struct pf_addr *saddr = pd->src, *daddr = pd->dst;
02742ec6 3142 sa_family_t af = pd->af;
02742ec6
JS
3143 struct pf_rule *r, *a = NULL;
3144 struct pf_ruleset *ruleset = NULL;
3145 struct pf_src_node *nsn = NULL;
315a7da3 3146 struct tcphdr *th = pd->hdr.tcp;
ed1f0be2
JL
3147 struct pf_state_key *skw = NULL, *sks = NULL;
3148 struct pf_state_key *sk = NULL, *nk = NULL;
02742ec6 3149 u_short reason;
315a7da3 3150 int rewrite = 0, hdrlen = 0;
70224baa 3151 int tag = -1, rtableid = -1;
70224baa
JL
3152 int asd = 0;
3153 int match = 0;
315a7da3 3154 int state_icmp = 0;
ed1f0be2
JL
3155 u_int16_t sport = 0, dport = 0;
3156 u_int16_t nport = 0, bport = 0;
3157 u_int16_t bproto_sum = 0, bip_sum = 0;
315a7da3 3158 u_int8_t icmptype = 0, icmpcode = 0;
70224baa 3159
ed1f0be2 3160
315a7da3 3161 if (direction == PF_IN && pf_check_congestion(ifq)) {
70224baa
JL
3162 REASON_SET(&reason, PFRES_CONGEST);
3163 return (PF_DROP);
3164 }
3165
3166 if (inp != NULL)
315a7da3
JL
3167 pd->lookup.done = pf_socket_lookup(direction, pd);
3168 else if (debug_pfugidhack) {
70224baa 3169 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n"));
315a7da3 3170 pd->lookup.done = pf_socket_lookup(direction, pd);
70224baa 3171 }
315a7da3 3172
315a7da3
JL
3173 switch (pd->proto) {
3174 case IPPROTO_TCP:
3175 sport = th->th_sport;
3176 dport = th->th_dport;
3177 hdrlen = sizeof(*th);
3178 break;
3179 case IPPROTO_UDP:
3180 sport = pd->hdr.udp->uh_sport;
3181 dport = pd->hdr.udp->uh_dport;
3182 hdrlen = sizeof(*pd->hdr.udp);
3183 break;
3184#ifdef INET
3185 case IPPROTO_ICMP:
3186 if (pd->af != AF_INET)
3187 break;
3188 sport = dport = pd->hdr.icmp->icmp_id;
ed1f0be2 3189 hdrlen = sizeof(*pd->hdr.icmp);
315a7da3
JL
3190 icmptype = pd->hdr.icmp->icmp_type;
3191 icmpcode = pd->hdr.icmp->icmp_code;
3192
3193 if (icmptype == ICMP_UNREACH ||
3194 icmptype == ICMP_SOURCEQUENCH ||
3195 icmptype == ICMP_REDIRECT ||
3196 icmptype == ICMP_TIMXCEED ||
3197 icmptype == ICMP_PARAMPROB)
3198 state_icmp++;
3199 break;
3200#endif /* INET */
3201#ifdef INET6
3202 case IPPROTO_ICMPV6:
ed1f0be2 3203 if (af != AF_INET6)
315a7da3
JL
3204 break;
3205 sport = dport = pd->hdr.icmp6->icmp6_id;
3206 hdrlen = sizeof(*pd->hdr.icmp6);
3207 icmptype = pd->hdr.icmp6->icmp6_type;
3208 icmpcode = pd->hdr.icmp6->icmp6_code;
3209
3210 if (icmptype == ICMP6_DST_UNREACH ||
3211 icmptype == ICMP6_PACKET_TOO_BIG ||
3212 icmptype == ICMP6_TIME_EXCEEDED ||
3213 icmptype == ICMP6_PARAM_PROB)
3214 state_icmp++;
3215 break;
3216#endif /* INET6 */
ed1f0be2
JL
3217 default:
3218 sport = dport = hdrlen = 0;
3219 break;
315a7da3 3220 }
02742ec6
JS
3221
3222 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3223
ed1f0be2
JL
3224 bport = nport = sport;
3225 /* check packet for BINAT/NAT/RDR */
3226 if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn,
3227 &skw, &sks, &sk, &nk, saddr, daddr, sport, dport)) != NULL) {
3228 if (nk == NULL || sk == NULL) {
3229 REASON_SET(&reason, PFRES_MEMORY);
3230 goto cleanup;
3231 }
3232
3233 if (pd->ip_sum)
3234 bip_sum = *pd->ip_sum;
3235
3236 switch (pd->proto) {
3237 case IPPROTO_TCP:
3238 bproto_sum = th->th_sum;
3239 pd->proto_sum = &th->th_sum;
3240
3241 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3242 nk->port[pd->sidx] != sport) {
315a7da3 3243 pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
ed1f0be2
JL
3244 &th->th_sum, &nk->addr[pd->sidx],
3245 nk->port[pd->sidx], 0, af);
3246 pd->sport = &th->th_sport;
315a7da3 3247 sport = th->th_sport;
ed1f0be2
JL
3248 }
3249
3250 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3251 nk->port[pd->didx] != dport) {
3252 pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
3253 &th->th_sum, &nk->addr[pd->didx],
3254 nk->port[pd->didx], 0, af);
3255 dport = th->th_dport;
3256 pd->dport = &th->th_dport;
3257 }
3258 rewrite++;
3259 break;
3260 case IPPROTO_UDP:
3261 bproto_sum = pd->hdr.udp->uh_sum;
3262 pd->proto_sum = &pd->hdr.udp->uh_sum;
3263
3264 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3265 nk->port[pd->sidx] != sport) {
315a7da3
JL
3266 pf_change_ap(saddr, &pd->hdr.udp->uh_sport,
3267 pd->ip_sum, &pd->hdr.udp->uh_sum,
ed1f0be2
JL
3268 &nk->addr[pd->sidx],
3269 nk->port[pd->sidx], 1, af);
315a7da3 3270 sport = pd->hdr.udp->uh_sport;
ed1f0be2
JL
3271 pd->sport = &pd->hdr.udp->uh_sport;
3272 }
3273
3274 if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3275 nk->port[pd->didx] != dport) {
3276 pf_change_ap(daddr, &pd->hdr.udp->uh_dport,
3277 pd->ip_sum, &pd->hdr.udp->uh_sum,
3278 &nk->addr[pd->didx],
3279 nk->port[pd->didx], 1, af);
3280 dport = pd->hdr.udp->uh_dport;
3281 pd->dport = &pd->hdr.udp->uh_dport;
3282 }
3283 rewrite++;
3284 break;
315a7da3 3285#ifdef INET
ed1f0be2
JL
3286 case IPPROTO_ICMP:
3287 nk->port[0] = nk->port[1];
3288 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET))
315a7da3 3289 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
ed1f0be2
JL
3290 nk->addr[pd->sidx].v4.s_addr, 0);
3291
3292 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET))
3293 pf_change_a(&daddr->v4.s_addr, pd->ip_sum,
3294 nk->addr[pd->didx].v4.s_addr, 0);
3295
3296 if (nk->port[1] != pd->hdr.icmp->icmp_id) {
315a7da3 3297 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup(
ed1f0be2
JL
3298 pd->hdr.icmp->icmp_cksum, sport,
3299 nk->port[1], 0);
3300 pd->hdr.icmp->icmp_id = nk->port[1];
3301 pd->sport = &pd->hdr.icmp->icmp_id;
3302 }
3303 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
3304 break;
315a7da3
JL
3305#endif /* INET */
3306#ifdef INET6
ed1f0be2
JL
3307 case IPPROTO_ICMPV6:
3308 nk->port[0] = nk->port[1];
3309 if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6))
315a7da3 3310 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
ed1f0be2
JL
3311 &nk->addr[pd->sidx], 0);
3312
3313 if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6))
3314 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
3315 &nk->addr[pd->didx], 0);
3316 rewrite++;
3317 break;
315a7da3 3318#endif /* INET */
ed1f0be2
JL
3319 default:
3320 switch (af) {
315a7da3 3321#ifdef INET
ed1f0be2
JL
3322 case AF_INET:
3323 if (PF_ANEQ(saddr,
3324 &nk->addr[pd->sidx], AF_INET))
315a7da3 3325 pf_change_a(&saddr->v4.s_addr,
ed1f0be2
JL
3326 pd->ip_sum,
3327 nk->addr[pd->sidx].v4.s_addr, 0);
3328
3329 if (PF_ANEQ(daddr,
3330 &nk->addr[pd->didx], AF_INET))
3331 pf_change_a(&daddr->v4.s_addr,
3332 pd->ip_sum,
3333 nk->addr[pd->didx].v4.s_addr, 0);
3334 break;
315a7da3
JL
3335#endif /* INET */
3336#ifdef INET6
ed1f0be2
JL
3337 case AF_INET6:
3338 if (PF_ANEQ(saddr,
3339 &nk->addr[pd->sidx], AF_INET6))
3340 PF_ACPY(saddr, &nk->addr[pd->sidx], af);
315a7da3 3341
ed1f0be2
JL
3342 if (PF_ANEQ(daddr,
3343 &nk->addr[pd->didx], AF_INET6))
3344 PF_ACPY(saddr, &nk->addr[pd->didx], af);
315a7da3 3345 break;
315a7da3 3346#endif /* INET */
315a7da3 3347 }
ed1f0be2 3348 break;
02742ec6 3349 }
ed1f0be2
JL
3350 if (nr->natpass)
3351 r = NULL;
3352 pd->nat_rule = nr;
02742ec6
JS
3353 }
3354
3355 while (r != NULL) {
3356 r->evaluations++;
70224baa 3357 if (pfi_kif_match(r->kif, kif) == r->ifnot)
02742ec6
JS
3358 r = r->skip[PF_SKIP_IFP].ptr;
3359 else if (r->direction && r->direction != direction)
3360 r = r->skip[PF_SKIP_DIR].ptr;
3361 else if (r->af && r->af != af)
3362 r = r->skip[PF_SKIP_AF].ptr;
315a7da3 3363 else if (r->proto && r->proto != pd->proto)
02742ec6 3364 r = r->skip[PF_SKIP_PROTO].ptr;
70224baa
JL
3365 else if (PF_MISMATCHAW(&r->src.addr, saddr, af,
3366 r->src.neg, kif))
02742ec6 3367 r = r->skip[PF_SKIP_SRC_ADDR].ptr;
315a7da3 3368 /* tcp/udp only. port_op always 0 in other cases */
02742ec6 3369 else if (r->src.port_op && !pf_match_port(r->src.port_op,
315a7da3 3370 r->src.port[0], r->src.port[1], sport))
02742ec6 3371 r = r->skip[PF_SKIP_SRC_PORT].ptr;
70224baa
JL
3372 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af,
3373 r->dst.neg, NULL))
02742ec6 3374 r = r->skip[PF_SKIP_DST_ADDR].ptr;
315a7da3 3375 /* tcp/udp only. port_op always 0 in other cases */
02742ec6 3376 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
315a7da3 3377 r->dst.port[0], r->dst.port[1], dport))
02742ec6 3378 r = r->skip[PF_SKIP_DST_PORT].ptr;
315a7da3
JL
3379 /* icmp only. type always 0 in other cases */
3380 else if (r->type && r->type != icmptype + 1)
3381 r = TAILQ_NEXT(r, entries);
3382 /* icmp only. type always 0 in other cases */
3383 else if (r->code && r->code != icmpcode + 1)
3384 r = TAILQ_NEXT(r, entries);
70224baa 3385 else if (r->tos && !(r->tos == pd->tos))
02742ec6
JS
3386 r = TAILQ_NEXT(r, entries);
3387 else if (r->rule_flag & PFRULE_FRAGMENT)
3388 r = TAILQ_NEXT(r, entries);
315a7da3
JL
3389 else if (pd->proto == IPPROTO_TCP &&
3390 (r->flagset & th->th_flags) != r->flags)
02742ec6 3391 r = TAILQ_NEXT(r, entries);
315a7da3 3392 /* tcp/udp only. uid.op always 0 in other cases */
70224baa 3393 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done =
315a7da3 3394 pf_socket_lookup(direction, pd), 1)) &&
02742ec6 3395 !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
70224baa 3396 pd->lookup.uid))
02742ec6 3397 r = TAILQ_NEXT(r, entries);
315a7da3 3398 /* tcp/udp only. gid.op always 0 in other cases */
70224baa 3399 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done =
315a7da3 3400 pf_socket_lookup(direction, pd), 1)) &&
02742ec6 3401 !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
70224baa 3402 pd->lookup.gid))
02742ec6 3403 r = TAILQ_NEXT(r, entries);
ed1f0be2
JL
3404 else if (r->prob &&
3405 r->prob <= karc4random())
75fda04a 3406 r = TAILQ_NEXT(r, entries);
315a7da3 3407 else if (r->match_tag && !pf_match_tag(m, r, &tag))
02742ec6 3408 r = TAILQ_NEXT(r, entries);
315a7da3
JL
3409 else if (r->os_fingerprint != PF_OSFP_ANY &&
3410 (pd->proto != IPPROTO_TCP || !pf_osfp_match(
3411 pf_osfp_fingerprint(pd, m, off, th),
3412 r->os_fingerprint)))
02742ec6
JS
3413 r = TAILQ_NEXT(r, entries);
3414 else {
3415 if (r->tag)
3416 tag = r->tag;
70224baa
JL
3417 if (r->rtableid >= 0)
3418 rtableid = r->rtableid;
02742ec6 3419 if (r->anchor == NULL) {
70224baa 3420 match = 1;
02742ec6
JS
3421 *rm = r;
3422 *am = a;
3423 *rsm = ruleset;
3424 if ((*rm)->quick)
3425 break;
3426 r = TAILQ_NEXT(r, entries);
3427 } else
70224baa
JL
3428 pf_step_into_anchor(&asd, &ruleset,
3429 PF_RULESET_FILTER, &r, &a, &match);
02742ec6 3430 }
70224baa
JL
3431 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
3432 PF_RULESET_FILTER, &r, &a, &match))
3433 break;
02742ec6
JS
3434 }
3435 r = *rm;
3436 a = *am;
3437 ruleset = *rsm;
3438
3439 REASON_SET(&reason, PFRES_MATCH);
3440
315a7da3 3441 if (r->log || (nr != NULL && nr->log)) {
02742ec6 3442 if (rewrite)
315a7da3 3443 m_copyback(m, off, hdrlen, pd->hdr.any);
70224baa
JL
3444 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr,
3445 a, ruleset, pd);
02742ec6
JS
3446 }
3447
3448 if ((r->action == PF_DROP) &&
3449 ((r->rule_flag & PFRULE_RETURNRST) ||
3450 (r->rule_flag & PFRULE_RETURNICMP) ||
3451 (r->rule_flag & PFRULE_RETURN))) {
3452 /* undo NAT changes, if they have taken place */
3453 if (nr != NULL) {
ed1f0be2
JL
3454 PF_ACPY(saddr, &sk->addr[pd->sidx], af);
3455 PF_ACPY(daddr, &sk->addr[pd->didx], af);
3456 if (pd->sport)
3457 *pd->sport = sk->port[pd->sidx];
3458 if (pd->dport)
3459 *pd->dport = sk->port[pd->didx];
3460 if (pd->proto_sum)
3461 *pd->proto_sum = bproto_sum;
3462 if (pd->ip_sum)
3463 *pd->ip_sum = bip_sum;
3464 m_copyback(m, off, hdrlen, pd->hdr.any);
02742ec6 3465 }
315a7da3
JL
3466 if (pd->proto == IPPROTO_TCP &&
3467 ((r->rule_flag & PFRULE_RETURNRST) ||
02742ec6
JS
3468 (r->rule_flag & PFRULE_RETURN)) &&
3469 !(th->th_flags & TH_RST)) {
315a7da3 3470 u_int32_t ack = ntohl(th->th_seq) + pd->p_len;
ed1f0be2
JL
3471 int len = 0;
3472 struct ip *h4;
3473 struct ip6_hdr *h6;
3474
3475 switch (af) {
3476 case AF_INET:
3477 h4 = mtod(m, struct ip *);
3478 len = h4->ip_len - off;
3479 break;
2dba2225 3480#ifdef INET6
ed1f0be2
JL
3481 case AF_INET6:
3482 h6 = mtod(m, struct ip6_hdr *);
3483 len = h6->ip6_plen - (off - sizeof(*h6));
3484 break;
2dba2225 3485#endif
ed1f0be2 3486 }
02742ec6 3487
ed1f0be2 3488 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af))
315a7da3
JL
3489 REASON_SET(&reason, PFRES_PROTCKSUM);
3490 else {
3491 if (th->th_flags & TH_SYN)
3492 ack++;
3493 if (th->th_flags & TH_FIN)
3494 ack++;
3495 pf_send_tcp(r, af, pd->dst,
3496 pd->src, th->th_dport, th->th_sport,
3497 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
3498 r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp);
3499 }
ed1f0be2
JL
3500 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET &&
3501 r->return_icmp)
02742ec6
JS
3502 pf_send_icmp(m, r->return_icmp >> 8,
3503 r->return_icmp & 255, af, r);
ed1f0be2
JL
3504 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 &&
3505 r->return_icmp6)
02742ec6
JS
3506 pf_send_icmp(m, r->return_icmp6 >> 8,
3507 r->return_icmp6 & 255, af, r);
3508 }
3509
315a7da3 3510 if (r->action == PF_DROP)
ed1f0be2 3511 goto cleanup;
02742ec6 3512
315a7da3 3513 if (pf_tag_packet(m, tag, rtableid)) {
70224baa 3514 REASON_SET(&reason, PFRES_MEMORY);
ed1f0be2 3515 goto cleanup;
70224baa 3516 }
02742ec6 3517
315a7da3
JL
3518 if (!state_icmp && (r->keep_state || nr != NULL ||
3519 (pd->flags & PFDESC_TCP_NORM))) {
ed1f0be2
JL
3520 int action;
3521 action = pf_create_state(r, nr, a, pd, nsn, skw, sks, nk, sk, m,
3522 off, sport, dport, &rewrite, kif, sm, tag, bproto_sum,
3523 bip_sum, hdrlen);
3524 if (action != PF_PASS)
3525 return (action);
3526 }
3527
3528 /* copy back packet headers if we performed NAT operations */
3529 if (rewrite)
3530 m_copyback(m, off, hdrlen, pd->hdr.any);
3531
3532 return (PF_PASS);
3533
02742ec6 3534cleanup:
ed1f0be2
JL
3535 if (sk != NULL)
3536 pool_put(&pf_state_key_pl, sk);
3537 if (nk != NULL)
3538 pool_put(&pf_state_key_pl, nk);
3539 return (PF_DROP);
3540}
02742ec6 3541
ed1f0be2
JL
3542static __inline int
3543pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a,
3544 struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *skw,
3545 struct pf_state_key *sks, struct pf_state_key *nk, struct pf_state_key *sk,
3546 struct mbuf *m, int off, u_int16_t sport, u_int16_t dport, int *rewrite,
3547 struct pfi_kif *kif, struct pf_state **sm, int tag, u_int16_t bproto_sum,
3548 u_int16_t bip_sum, int hdrlen)
3549{
3550 struct pf_state *s = NULL;
3551 struct pf_src_node *sn = NULL;
3552 struct tcphdr *th = pd->hdr.tcp;
3553 u_int16_t mss = tcp_mssdflt;
3554 u_short reason;
315a7da3 3555
ed1f0be2
JL
3556 /* check maximums */
3557 if (r->max_states && (r->states_cur >= r->max_states)) {
3558 pf_status.lcounters[LCNT_STATES]++;
3559 REASON_SET(&reason, PFRES_MAXSTATES);
3560 return (PF_DROP);
3561 }
3562 /* src node for filter rule */
3563 if ((r->rule_flag & PFRULE_SRCTRACK ||
3564 r->rpool.opts & PF_POOL_STICKYADDR) &&
3565 pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) {
3566 REASON_SET(&reason, PFRES_SRCLIMIT);
3567 goto csfailed;
3568 }
3569 /* src node for translation rule */
3570 if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3571 pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) {
3572 REASON_SET(&reason, PFRES_SRCLIMIT);
3573 goto csfailed;
3574 }
3575 s = pool_get(&pf_state_pl, PR_NOWAIT | PR_ZERO);
3576 if (s == NULL) {
3577 REASON_SET(&reason, PFRES_MEMORY);
3578 goto csfailed;
3579 }
3580 s->id = 0; /* XXX Do we really need that? not in OpenBSD */
3581 s->creatorid = 0;
3582 s->rule.ptr = r;
3583 s->nat_rule.ptr = nr;
3584 s->anchor.ptr = a;
3585 STATE_INC_COUNTERS(s);
3586 if (r->allow_opts)
3587 s->state_flags |= PFSTATE_ALLOWOPTS;
3588 if (r->rule_flag & PFRULE_STATESLOPPY)
3589 s->state_flags |= PFSTATE_SLOPPY;
3590 s->log = r->log & PF_LOG_ALL;
3591 if (nr != NULL)
3592 s->log |= nr->log & PF_LOG_ALL;
3593 switch (pd->proto) {
3594 case IPPROTO_TCP:
3595 s->src.seqlo = ntohl(th->th_seq);
3596 s->src.seqhi = s->src.seqlo + pd->p_len + 1;
3597 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
3598 r->keep_state == PF_STATE_MODULATE) {
3599 /* Generate sequence number modulator */
3600 if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) ==
3601 0)
3602 s->src.seqdiff = 1;
3603 pf_change_a(&th->th_seq, &th->th_sum,
3604 htonl(s->src.seqlo + s->src.seqdiff), 0);
3605 *rewrite = 1;
3606 } else
3607 s->src.seqdiff = 0;
3608 if (th->th_flags & TH_SYN) {
3609 s->src.seqhi++;
3610 s->src.wscale = pf_get_wscale(m, off,
3611 th->th_off, pd->af);
315a7da3 3612 }
ed1f0be2
JL
3613 s->src.max_win = MAX(ntohs(th->th_win), 1);
3614 if (s->src.wscale & PF_WSCALE_MASK) {
3615 /* Remove scale factor from initial window */
3616 int win = s->src.max_win;
3617 win += 1 << (s->src.wscale & PF_WSCALE_MASK);
3618 s->src.max_win = (win - 1) >>
3619 (s->src.wscale & PF_WSCALE_MASK);
315a7da3 3620 }
ed1f0be2
JL
3621 if (th->th_flags & TH_FIN)
3622 s->src.seqhi++;
3623 s->dst.seqhi = 1;
3624 s->dst.max_win = 1;
3625 s->src.state = TCPS_SYN_SENT;
3626 s->dst.state = TCPS_CLOSED;
3627 s->timeout = PFTM_TCP_FIRST_PACKET;
3628 break;
3629 case IPPROTO_UDP:
3630 s->src.state = PFUDPS_SINGLE;
3631 s->dst.state = PFUDPS_NO_TRAFFIC;
3632 s->timeout = PFTM_UDP_FIRST_PACKET;
3633 break;
3634 case IPPROTO_ICMP:
315a7da3 3635#ifdef INET6
ed1f0be2 3636 case IPPROTO_ICMPV6:
315a7da3 3637#endif
ed1f0be2
JL
3638 s->timeout = PFTM_ICMP_FIRST_PACKET;
3639 break;
3640 default:
3641 s->src.state = PFOTHERS_SINGLE;
3642 s->dst.state = PFOTHERS_NO_TRAFFIC;
3643 s->timeout = PFTM_OTHER_FIRST_PACKET;
3644 }
315a7da3 3645
ed1f0be2
JL
3646 s->creation = time_second;
3647 s->expire = time_second;
315a7da3 3648
ed1f0be2
JL
3649 if (sn != NULL) {
3650 s->src_node = sn;
3651 s->src_node->states++;
3652 }
3653 if (nsn != NULL) {
3654 /* XXX We only modify one side for now. */
3655 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af);
3656 s->nat_src_node = nsn;
3657 s->nat_src_node->states++;
3658 }
3659 if (pd->proto == IPPROTO_TCP) {
3660 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
3661 off, pd, th, &s->src, &s->dst)) {
3662 REASON_SET(&reason, PFRES_MEMORY);
02742ec6 3663 pf_src_tree_remove_state(s);
70224baa 3664 STATE_DEC_COUNTERS(s);
02742ec6
JS
3665 pool_put(&pf_state_pl, s);
3666 return (PF_DROP);
70224baa 3667 }
ed1f0be2
JL
3668 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
3669 pf_normalize_tcp_stateful(m, off, pd, &reason, th, s,
3670 &s->src, &s->dst, rewrite)) {
3671 /* This really shouldn't happen!!! */
3672 DPFPRINTF(PF_DEBUG_URGENT,
3673 ("pf_normalize_tcp_stateful failed on first pkt"));
3674 pf_normalize_tcp_cleanup(s);
3675 pf_src_tree_remove_state(s);
3676 STATE_DEC_COUNTERS(s);
3677 pool_put(&pf_state_pl, s);
3678 return (PF_DROP);
315a7da3 3679 }
02742ec6 3680 }
ed1f0be2 3681 s->direction = pd->dir;
02742ec6 3682
ed1f0be2
JL
3683 if (sk == NULL && pf_state_key_setup(pd, nr, &skw, &sks, &sk, &nk,
3684 pd->src, pd->dst, sport, dport))
3685 goto csfailed;
3686
3687 if (pf_state_insert(BOUND_IFACE(r, kif), skw, sks, s)) {
3688 if (pd->proto == IPPROTO_TCP)
3689 pf_normalize_tcp_cleanup(s);
3690 REASON_SET(&reason, PFRES_STATEINS);
3691 pf_src_tree_remove_state(s);
3692 STATE_DEC_COUNTERS(s);
3693 pool_put(&pf_state_pl, s);
3694 return (PF_DROP);
3695 } else
3696 *sm = s;
3697
3698 pf_set_rt_ifp(s, pd->src); /* needs s->state_key set */
3699 if (tag > 0) {
3700 pf_tag_ref(tag);
3701 s->tag = tag;
3702 }
3703 if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) ==
3704 TH_SYN && r->keep_state == PF_STATE_SYNPROXY) {
3705 s->src.state = PF_TCPS_PROXY_SRC;
3706 /* undo NAT changes, if they have taken place */
3707 if (nr != NULL) {
3708 struct pf_state_key *skt = s->key[PF_SK_WIRE];
3709 if (pd->dir == PF_OUT)
3710 skt = s->key[PF_SK_STACK];
3711 PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af);
3712 PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af);
3713 if (pd->sport)
3714 *pd->sport = skt->port[pd->sidx];
3715 if (pd->dport)
3716 *pd->dport = skt->port[pd->didx];
3717 if (pd->proto_sum)
3718 *pd->proto_sum = bproto_sum;
3719 if (pd->ip_sum)
3720 *pd->ip_sum = bip_sum;
3721 m_copyback(m, off, hdrlen, pd->hdr.any);
3722 }
3723 s->src.seqhi = htonl(karc4random());
3724 /* Find mss option */
3725 mss = pf_get_mss(m, off, th->th_off, pd->af);
3726 mss = pf_calc_mss(pd->src, pd->af, mss);
3727 mss = pf_calc_mss(pd->dst, pd->af, mss);
3728 s->src.mss = mss;
3729 pf_send_tcp(r, pd->af, pd->dst, pd->src, th->th_dport,
3730 th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
3731 TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL);
3732 REASON_SET(&reason, PFRES_SYNPROXY);
3733 return (PF_SYNPROXY_DROP);
3734 }
315a7da3 3735
02742ec6 3736 return (PF_PASS);
ed1f0be2
JL
3737
3738csfailed:
3739 if (sk != NULL)
3740 pool_put(&pf_state_key_pl, sk);
3741 if (nk != NULL)
3742 pool_put(&pf_state_key_pl, nk);
3743
3744 if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3745 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
3746 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3747 pf_status.src_nodes--;
3748 pool_put(&pf_src_tree_pl, sn);
3749 }
3750 if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0) {
3751 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
3752 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
3753 pf_status.src_nodes--;
3754 pool_put(&pf_src_tree_pl, nsn);
3755 }
3756 return (PF_DROP);
02742ec6
JS
3757}
3758
3759int
3760pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
3761 struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
3762 struct pf_ruleset **rsm)
3763{
3764 struct pf_rule *r, *a = NULL;
3765 struct pf_ruleset *ruleset = NULL;
3766 sa_family_t af = pd->af;
3767 u_short reason;
3768 int tag = -1;
70224baa
JL
3769 int asd = 0;
3770 int match = 0;
02742ec6
JS
3771
3772 r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3773 while (r != NULL) {
3774 r->evaluations++;
70224baa 3775 if (pfi_kif_match(r->kif, kif) == r->ifnot)
02742ec6
JS
3776 r = r->skip[PF_SKIP_IFP].ptr;
3777 else if (r->direction && r->direction != direction)
3778 r = r->skip[PF_SKIP_DIR].ptr;
3779 else if (r->af && r->af != af)
3780 r = r->skip[PF_SKIP_AF].ptr;
3781 else if (r->proto && r->proto != pd->proto)
3782 r = r->skip[PF_SKIP_PROTO].ptr;
70224baa
JL
3783 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af,
3784 r->src.neg, kif))
02742ec6 3785 r = r->skip[PF_SKIP_SRC_ADDR].ptr;
70224baa
JL
3786 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af,
3787 r->dst.neg, NULL))
02742ec6 3788 r = r->skip[PF_SKIP_DST_ADDR].ptr;
70224baa 3789 else if (r->tos && !(r->tos == pd->tos))
02742ec6 3790 r = TAILQ_NEXT(r, entries);
a814431a
MD
3791 else if (r->os_fingerprint != PF_OSFP_ANY)
3792 r = TAILQ_NEXT(r, entries);
3793 else if (pd->proto == IPPROTO_UDP &&
3794 (r->src.port_op || r->dst.port_op))
3795 r = TAILQ_NEXT(r, entries);
3796 else if (pd->proto == IPPROTO_TCP &&
3797 (r->src.port_op || r->dst.port_op || r->flagset))
3798 r = TAILQ_NEXT(r, entries);
3799 else if ((pd->proto == IPPROTO_ICMP ||
3800 pd->proto == IPPROTO_ICMPV6) &&
3801 (r->type || r->code))
02742ec6 3802 r = TAILQ_NEXT(r, entries);
75fda04a
MD
3803 else if (r->prob && r->prob <= karc4random())
3804 r = TAILQ_NEXT(r, entries);
315a7da3 3805 else if (r->match_tag && !pf_match_tag(m, r, &tag))
02742ec6 3806 r = TAILQ_NEXT(r, entries);
02742ec6
JS
3807 else {
3808 if (r->anchor == NULL) {
70224baa 3809 match = 1;
02742ec6
JS
3810 *rm = r;
3811 *am = a;
3812 *rsm = ruleset;
3813 if ((*rm)->quick)
3814 break;
3815 r = TAILQ_NEXT(r, entries);
3816 } else
70224baa
JL
3817 pf_step_into_anchor(&asd, &ruleset,
3818 PF_RULESET_FILTER, &r, &a, &match);
02742ec6 3819 }
70224baa
JL
3820 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
3821 PF_RULESET_FILTER, &r, &a, &match))
3822 break;
02742ec6
JS
3823 }
3824 r = *rm;
3825 a = *am;
3826 ruleset = *rsm;
3827
3828 REASON_SET(&reason, PFRES_MATCH);
3829
3830 if (r->log)
70224baa
JL
3831 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset,
3832 pd);
02742ec6
JS
3833
3834 if (r->action != PF_PASS)
3835 return (PF_DROP);
3836
315a7da3 3837 if (pf_tag_packet(m, tag, -1)) {
70224baa
JL
3838 REASON_SET(&reason, PFRES_MEMORY);
3839 return (PF_DROP);
3840 }
02742ec6
JS
3841
3842 return (PF_PASS);
3843}
3844
3845int
ed1f0be2
JL
3846pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst,
3847 struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off,
3848 struct pf_pdesc *pd, u_short *reason, int *copyback)
02742ec6 3849{
02742ec6
JS
3850 struct tcphdr *th = pd->hdr.tcp;
3851 u_int16_t win = ntohs(th->th_win);
70224baa 3852 u_int32_t ack, end, seq, orig_seq;
02742ec6
JS
3853 u_int8_t sws, dws;
3854 int ackskew;
02742ec6
JS
3855
3856 if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
3857 sws = src->wscale & PF_WSCALE_MASK;
3858 dws = dst->wscale & PF_WSCALE_MASK;
3859 } else
3860 sws = dws = 0;
3861
3862 /*
3863 * Sequence tracking algorithm from Guido van Rooij's paper:
3864 * http://www.madison-gurkha.com/publications/tcp_filtering/
3865 * tcp_filtering.ps
3866 */
3867
70224baa 3868 orig_seq = seq = ntohl(th->th_seq);
02742ec6 3869 if (src->seqlo == 0) {
70224baa
JL
3870 /* First packet from this end. Set its state */
3871
02742ec6
JS
3872 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
3873 src->scrub == NULL) {
3874 if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
3875 REASON_SET(reason, PFRES_MEMORY);
3876 return (PF_DROP);
3877 }
3878 }
3879
3880 /* Deferred generation of sequence number modulator */
3881 if (dst->seqdiff && !src->seqdiff) {
ed1f0be2
JL
3882 /* use random iss for the TCP server */
3883 while ((src->seqdiff = karc4random() - seq) == 0)
02742ec6
JS
3884 ;
3885 ack = ntohl(th->th_ack) - dst->seqdiff;
3886 pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3887 src->seqdiff), 0);
3888 pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
ed1f0be2 3889 *copyback = 1;
02742ec6
JS
3890 } else {
3891 ack = ntohl(th->th_ack);
3892 }
3893
3894 end = seq + pd->p_len;
3895 if (th->th_flags & TH_SYN) {
3896 end++;
a814431a 3897 (*state)->sync_flags |= PFSTATE_GOT_SYN2;
02742ec6</