xref: /freebsd/sys/netpfil/pf/pf.c (revision f0cfa1b168014f56c02b83e5f28412cc5f78d117)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 2001 Daniel Hartmeier
5  * Copyright (c) 2002 - 2008 Henning Brauer
6  * Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org>
7  * All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  *
13  *    - Redistributions of source code must retain the above copyright
14  *      notice, this list of conditions and the following disclaimer.
15  *    - Redistributions in binary form must reproduce the above
16  *      copyright notice, this list of conditions and the following
17  *      disclaimer in the documentation and/or other materials provided
18  *      with the distribution.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
26  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
28  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
30  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31  * POSSIBILITY OF SUCH DAMAGE.
32  *
33  * Effort sponsored in part by the Defense Advanced Research Projects
34  * Agency (DARPA) and Air Force Research Laboratory, Air Force
35  * Materiel Command, USAF, under agreement number F30602-01-2-0537.
36  *
37  *	$OpenBSD: pf.c,v 1.634 2009/02/27 12:37:45 henning Exp $
38  */
39 
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD$");
42 
43 #include "opt_inet.h"
44 #include "opt_inet6.h"
45 #include "opt_bpf.h"
46 #include "opt_pf.h"
47 
48 #include <sys/param.h>
49 #include <sys/bus.h>
50 #include <sys/endian.h>
51 #include <sys/hash.h>
52 #include <sys/interrupt.h>
53 #include <sys/kernel.h>
54 #include <sys/kthread.h>
55 #include <sys/limits.h>
56 #include <sys/mbuf.h>
57 #include <sys/md5.h>
58 #include <sys/random.h>
59 #include <sys/refcount.h>
60 #include <sys/socket.h>
61 #include <sys/sysctl.h>
62 #include <sys/taskqueue.h>
63 #include <sys/ucred.h>
64 
65 #include <net/if.h>
66 #include <net/if_var.h>
67 #include <net/if_types.h>
68 #include <net/if_vlan_var.h>
69 #include <net/route.h>
70 #include <net/radix_mpath.h>
71 #include <net/vnet.h>
72 
73 #include <net/pfvar.h>
74 #include <net/if_pflog.h>
75 #include <net/if_pfsync.h>
76 
77 #include <netinet/in_pcb.h>
78 #include <netinet/in_var.h>
79 #include <netinet/in_fib.h>
80 #include <netinet/ip.h>
81 #include <netinet/ip_fw.h>
82 #include <netinet/ip_icmp.h>
83 #include <netinet/icmp_var.h>
84 #include <netinet/ip_var.h>
85 #include <netinet/tcp.h>
86 #include <netinet/tcp_fsm.h>
87 #include <netinet/tcp_seq.h>
88 #include <netinet/tcp_timer.h>
89 #include <netinet/tcp_var.h>
90 #include <netinet/udp.h>
91 #include <netinet/udp_var.h>
92 
93 #include <netpfil/ipfw/ip_fw_private.h> /* XXX: only for DIR_IN/DIR_OUT */
94 
95 #ifdef INET6
96 #include <netinet/ip6.h>
97 #include <netinet/icmp6.h>
98 #include <netinet6/nd6.h>
99 #include <netinet6/ip6_var.h>
100 #include <netinet6/in6_pcb.h>
101 #include <netinet6/in6_fib.h>
102 #include <netinet6/scope6_var.h>
103 #endif /* INET6 */
104 
105 #include <machine/in_cksum.h>
106 #include <security/mac/mac_framework.h>
107 
108 #define	DPFPRINTF(n, x)	if (V_pf_status.debug >= (n)) printf x
109 
110 /*
111  * Global variables
112  */
113 
114 /* state tables */
115 VNET_DEFINE(struct pf_altqqueue,	 pf_altqs[2]);
116 VNET_DEFINE(struct pf_palist,		 pf_pabuf);
117 VNET_DEFINE(struct pf_altqqueue *,	 pf_altqs_active);
118 VNET_DEFINE(struct pf_altqqueue *,	 pf_altqs_inactive);
119 VNET_DEFINE(struct pf_kstatus,		 pf_status);
120 
121 VNET_DEFINE(u_int32_t,			 ticket_altqs_active);
122 VNET_DEFINE(u_int32_t,			 ticket_altqs_inactive);
123 VNET_DEFINE(int,			 altqs_inactive_open);
124 VNET_DEFINE(u_int32_t,			 ticket_pabuf);
125 
126 VNET_DEFINE(MD5_CTX,			 pf_tcp_secret_ctx);
127 #define	V_pf_tcp_secret_ctx		 VNET(pf_tcp_secret_ctx)
128 VNET_DEFINE(u_char,			 pf_tcp_secret[16]);
129 #define	V_pf_tcp_secret			 VNET(pf_tcp_secret)
130 VNET_DEFINE(int,			 pf_tcp_secret_init);
131 #define	V_pf_tcp_secret_init		 VNET(pf_tcp_secret_init)
132 VNET_DEFINE(int,			 pf_tcp_iss_off);
133 #define	V_pf_tcp_iss_off		 VNET(pf_tcp_iss_off)
134 VNET_DECLARE(int,			 pf_vnet_active);
135 #define	V_pf_vnet_active		 VNET(pf_vnet_active)
136 
137 static VNET_DEFINE(uint32_t, pf_purge_idx);
138 #define V_pf_purge_idx	VNET(pf_purge_idx)
139 
140 /*
141  * Queue for pf_intr() sends.
142  */
143 static MALLOC_DEFINE(M_PFTEMP, "pf_temp", "pf(4) temporary allocations");
144 struct pf_send_entry {
145 	STAILQ_ENTRY(pf_send_entry)	pfse_next;
146 	struct mbuf			*pfse_m;
147 	enum {
148 		PFSE_IP,
149 		PFSE_IP6,
150 		PFSE_ICMP,
151 		PFSE_ICMP6,
152 	}				pfse_type;
153 	struct {
154 		int		type;
155 		int		code;
156 		int		mtu;
157 	} icmpopts;
158 };
159 
160 STAILQ_HEAD(pf_send_head, pf_send_entry);
161 static VNET_DEFINE(struct pf_send_head, pf_sendqueue);
162 #define	V_pf_sendqueue	VNET(pf_sendqueue)
163 
164 static struct mtx pf_sendqueue_mtx;
165 MTX_SYSINIT(pf_sendqueue_mtx, &pf_sendqueue_mtx, "pf send queue", MTX_DEF);
166 #define	PF_SENDQ_LOCK()		mtx_lock(&pf_sendqueue_mtx)
167 #define	PF_SENDQ_UNLOCK()	mtx_unlock(&pf_sendqueue_mtx)
168 
169 /*
170  * Queue for pf_overload_task() tasks.
171  */
172 struct pf_overload_entry {
173 	SLIST_ENTRY(pf_overload_entry)	next;
174 	struct pf_addr  		addr;
175 	sa_family_t			af;
176 	uint8_t				dir;
177 	struct pf_rule  		*rule;
178 };
179 
180 SLIST_HEAD(pf_overload_head, pf_overload_entry);
181 static VNET_DEFINE(struct pf_overload_head, pf_overloadqueue);
182 #define V_pf_overloadqueue	VNET(pf_overloadqueue)
183 static VNET_DEFINE(struct task, pf_overloadtask);
184 #define	V_pf_overloadtask	VNET(pf_overloadtask)
185 
186 static struct mtx pf_overloadqueue_mtx;
187 MTX_SYSINIT(pf_overloadqueue_mtx, &pf_overloadqueue_mtx,
188     "pf overload/flush queue", MTX_DEF);
189 #define	PF_OVERLOADQ_LOCK()	mtx_lock(&pf_overloadqueue_mtx)
190 #define	PF_OVERLOADQ_UNLOCK()	mtx_unlock(&pf_overloadqueue_mtx)
191 
192 VNET_DEFINE(struct pf_rulequeue, pf_unlinked_rules);
193 struct mtx pf_unlnkdrules_mtx;
194 MTX_SYSINIT(pf_unlnkdrules_mtx, &pf_unlnkdrules_mtx, "pf unlinked rules",
195     MTX_DEF);
196 
197 static VNET_DEFINE(uma_zone_t,	pf_sources_z);
198 #define	V_pf_sources_z	VNET(pf_sources_z)
199 uma_zone_t		pf_mtag_z;
200 VNET_DEFINE(uma_zone_t,	 pf_state_z);
201 VNET_DEFINE(uma_zone_t,	 pf_state_key_z);
202 
203 VNET_DEFINE(uint64_t, pf_stateid[MAXCPU]);
204 #define	PFID_CPUBITS	8
205 #define	PFID_CPUSHIFT	(sizeof(uint64_t) * NBBY - PFID_CPUBITS)
206 #define	PFID_CPUMASK	((uint64_t)((1 << PFID_CPUBITS) - 1) <<	PFID_CPUSHIFT)
207 #define	PFID_MAXID	(~PFID_CPUMASK)
208 CTASSERT((1 << PFID_CPUBITS) >= MAXCPU);
209 
210 static void		 pf_src_tree_remove_state(struct pf_state *);
211 static void		 pf_init_threshold(struct pf_threshold *, u_int32_t,
212 			    u_int32_t);
213 static void		 pf_add_threshold(struct pf_threshold *);
214 static int		 pf_check_threshold(struct pf_threshold *);
215 
216 static void		 pf_change_ap(struct mbuf *, struct pf_addr *, u_int16_t *,
217 			    u_int16_t *, u_int16_t *, struct pf_addr *,
218 			    u_int16_t, u_int8_t, sa_family_t);
219 static int		 pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *,
220 			    struct tcphdr *, struct pf_state_peer *);
221 static void		 pf_change_icmp(struct pf_addr *, u_int16_t *,
222 			    struct pf_addr *, struct pf_addr *, u_int16_t,
223 			    u_int16_t *, u_int16_t *, u_int16_t *,
224 			    u_int16_t *, u_int8_t, sa_family_t);
225 static void		 pf_send_tcp(struct mbuf *,
226 			    const struct pf_rule *, sa_family_t,
227 			    const struct pf_addr *, const struct pf_addr *,
228 			    u_int16_t, u_int16_t, u_int32_t, u_int32_t,
229 			    u_int8_t, u_int16_t, u_int16_t, u_int8_t, int,
230 			    u_int16_t, struct ifnet *);
231 static void		 pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
232 			    sa_family_t, struct pf_rule *);
233 static void		 pf_detach_state(struct pf_state *);
234 static int		 pf_state_key_attach(struct pf_state_key *,
235 			    struct pf_state_key *, struct pf_state *);
236 static void		 pf_state_key_detach(struct pf_state *, int);
237 static int		 pf_state_key_ctor(void *, int, void *, int);
238 static u_int32_t	 pf_tcp_iss(struct pf_pdesc *);
239 static int		 pf_test_rule(struct pf_rule **, struct pf_state **,
240 			    int, struct pfi_kif *, struct mbuf *, int,
241 			    struct pf_pdesc *, struct pf_rule **,
242 			    struct pf_ruleset **, struct inpcb *);
243 static int		 pf_create_state(struct pf_rule *, struct pf_rule *,
244 			    struct pf_rule *, struct pf_pdesc *,
245 			    struct pf_src_node *, struct pf_state_key *,
246 			    struct pf_state_key *, struct mbuf *, int,
247 			    u_int16_t, u_int16_t, int *, struct pfi_kif *,
248 			    struct pf_state **, int, u_int16_t, u_int16_t,
249 			    int);
250 static int		 pf_test_fragment(struct pf_rule **, int,
251 			    struct pfi_kif *, struct mbuf *, void *,
252 			    struct pf_pdesc *, struct pf_rule **,
253 			    struct pf_ruleset **);
254 static int		 pf_tcp_track_full(struct pf_state_peer *,
255 			    struct pf_state_peer *, struct pf_state **,
256 			    struct pfi_kif *, struct mbuf *, int,
257 			    struct pf_pdesc *, u_short *, int *);
258 static int		 pf_tcp_track_sloppy(struct pf_state_peer *,
259 			    struct pf_state_peer *, struct pf_state **,
260 			    struct pf_pdesc *, u_short *);
261 static int		 pf_test_state_tcp(struct pf_state **, int,
262 			    struct pfi_kif *, struct mbuf *, int,
263 			    void *, struct pf_pdesc *, u_short *);
264 static int		 pf_test_state_udp(struct pf_state **, int,
265 			    struct pfi_kif *, struct mbuf *, int,
266 			    void *, struct pf_pdesc *);
267 static int		 pf_test_state_icmp(struct pf_state **, int,
268 			    struct pfi_kif *, struct mbuf *, int,
269 			    void *, struct pf_pdesc *, u_short *);
270 static int		 pf_test_state_other(struct pf_state **, int,
271 			    struct pfi_kif *, struct mbuf *, struct pf_pdesc *);
272 static u_int8_t		 pf_get_wscale(struct mbuf *, int, u_int16_t,
273 			    sa_family_t);
274 static u_int16_t	 pf_get_mss(struct mbuf *, int, u_int16_t,
275 			    sa_family_t);
276 static u_int16_t	 pf_calc_mss(struct pf_addr *, sa_family_t,
277 				int, u_int16_t);
278 static int		 pf_check_proto_cksum(struct mbuf *, int, int,
279 			    u_int8_t, sa_family_t);
280 static void		 pf_print_state_parts(struct pf_state *,
281 			    struct pf_state_key *, struct pf_state_key *);
282 static int		 pf_addr_wrap_neq(struct pf_addr_wrap *,
283 			    struct pf_addr_wrap *);
284 static struct pf_state	*pf_find_state(struct pfi_kif *,
285 			    struct pf_state_key_cmp *, u_int);
286 static int		 pf_src_connlimit(struct pf_state **);
287 static void		 pf_overload_task(void *v, int pending);
288 static int		 pf_insert_src_node(struct pf_src_node **,
289 			    struct pf_rule *, struct pf_addr *, sa_family_t);
290 static u_int		 pf_purge_expired_states(u_int, int);
291 static void		 pf_purge_unlinked_rules(void);
292 static int		 pf_mtag_uminit(void *, int, int);
293 static void		 pf_mtag_free(struct m_tag *);
294 #ifdef INET
295 static void		 pf_route(struct mbuf **, struct pf_rule *, int,
296 			    struct ifnet *, struct pf_state *,
297 			    struct pf_pdesc *);
298 #endif /* INET */
299 #ifdef INET6
300 static void		 pf_change_a6(struct pf_addr *, u_int16_t *,
301 			    struct pf_addr *, u_int8_t);
302 static void		 pf_route6(struct mbuf **, struct pf_rule *, int,
303 			    struct ifnet *, struct pf_state *,
304 			    struct pf_pdesc *);
305 #endif /* INET6 */
306 
307 int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len);
308 
309 extern int pf_end_threads;
310 extern struct proc *pf_purge_proc;
311 
312 VNET_DEFINE(struct pf_limit, pf_limits[PF_LIMIT_MAX]);
313 
314 #define	PACKET_LOOPED(pd)	((pd)->pf_mtag &&			\
315 				 (pd)->pf_mtag->flags & PF_PACKET_LOOPED)
316 
317 #define	STATE_LOOKUP(i, k, d, s, pd)					\
318 	do {								\
319 		(s) = pf_find_state((i), (k), (d));			\
320 		if ((s) == NULL)					\
321 			return (PF_DROP);				\
322 		if (PACKET_LOOPED(pd))					\
323 			return (PF_PASS);				\
324 		if ((d) == PF_OUT &&					\
325 		    (((s)->rule.ptr->rt == PF_ROUTETO &&		\
326 		    (s)->rule.ptr->direction == PF_OUT) ||		\
327 		    ((s)->rule.ptr->rt == PF_REPLYTO &&			\
328 		    (s)->rule.ptr->direction == PF_IN)) &&		\
329 		    (s)->rt_kif != NULL &&				\
330 		    (s)->rt_kif != (i))					\
331 			return (PF_PASS);				\
332 	} while (0)
333 
334 #define	BOUND_IFACE(r, k) \
335 	((r)->rule_flag & PFRULE_IFBOUND) ? (k) : V_pfi_all
336 
337 #define	STATE_INC_COUNTERS(s)						\
338 	do {								\
339 		counter_u64_add(s->rule.ptr->states_cur, 1);		\
340 		counter_u64_add(s->rule.ptr->states_tot, 1);		\
341 		if (s->anchor.ptr != NULL) {				\
342 			counter_u64_add(s->anchor.ptr->states_cur, 1);	\
343 			counter_u64_add(s->anchor.ptr->states_tot, 1);	\
344 		}							\
345 		if (s->nat_rule.ptr != NULL) {				\
346 			counter_u64_add(s->nat_rule.ptr->states_cur, 1);\
347 			counter_u64_add(s->nat_rule.ptr->states_tot, 1);\
348 		}							\
349 	} while (0)
350 
351 #define	STATE_DEC_COUNTERS(s)						\
352 	do {								\
353 		if (s->nat_rule.ptr != NULL)				\
354 			counter_u64_add(s->nat_rule.ptr->states_cur, -1);\
355 		if (s->anchor.ptr != NULL)				\
356 			counter_u64_add(s->anchor.ptr->states_cur, -1);	\
357 		counter_u64_add(s->rule.ptr->states_cur, -1);		\
358 	} while (0)
359 
360 static MALLOC_DEFINE(M_PFHASH, "pf_hash", "pf(4) hash header structures");
361 VNET_DEFINE(struct pf_keyhash *, pf_keyhash);
362 VNET_DEFINE(struct pf_idhash *, pf_idhash);
363 VNET_DEFINE(struct pf_srchash *, pf_srchash);
364 
365 SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW, 0, "pf(4)");
366 
367 u_long	pf_hashmask;
368 u_long	pf_srchashmask;
369 static u_long	pf_hashsize;
370 static u_long	pf_srchashsize;
371 
372 SYSCTL_ULONG(_net_pf, OID_AUTO, states_hashsize, CTLFLAG_RDTUN,
373     &pf_hashsize, 0, "Size of pf(4) states hashtable");
374 SYSCTL_ULONG(_net_pf, OID_AUTO, source_nodes_hashsize, CTLFLAG_RDTUN,
375     &pf_srchashsize, 0, "Size of pf(4) source nodes hashtable");
376 
377 VNET_DEFINE(void *, pf_swi_cookie);
378 
379 VNET_DEFINE(uint32_t, pf_hashseed);
380 #define	V_pf_hashseed	VNET(pf_hashseed)
381 
382 int
383 pf_addr_cmp(struct pf_addr *a, struct pf_addr *b, sa_family_t af)
384 {
385 
386 	switch (af) {
387 #ifdef INET
388 	case AF_INET:
389 		if (a->addr32[0] > b->addr32[0])
390 			return (1);
391 		if (a->addr32[0] < b->addr32[0])
392 			return (-1);
393 		break;
394 #endif /* INET */
395 #ifdef INET6
396 	case AF_INET6:
397 		if (a->addr32[3] > b->addr32[3])
398 			return (1);
399 		if (a->addr32[3] < b->addr32[3])
400 			return (-1);
401 		if (a->addr32[2] > b->addr32[2])
402 			return (1);
403 		if (a->addr32[2] < b->addr32[2])
404 			return (-1);
405 		if (a->addr32[1] > b->addr32[1])
406 			return (1);
407 		if (a->addr32[1] < b->addr32[1])
408 			return (-1);
409 		if (a->addr32[0] > b->addr32[0])
410 			return (1);
411 		if (a->addr32[0] < b->addr32[0])
412 			return (-1);
413 		break;
414 #endif /* INET6 */
415 	default:
416 		panic("%s: unknown address family %u", __func__, af);
417 	}
418 	return (0);
419 }
420 
421 static __inline uint32_t
422 pf_hashkey(struct pf_state_key *sk)
423 {
424 	uint32_t h;
425 
426 	h = murmur3_32_hash32((uint32_t *)sk,
427 	    sizeof(struct pf_state_key_cmp)/sizeof(uint32_t),
428 	    V_pf_hashseed);
429 
430 	return (h & pf_hashmask);
431 }
432 
433 static __inline uint32_t
434 pf_hashsrc(struct pf_addr *addr, sa_family_t af)
435 {
436 	uint32_t h;
437 
438 	switch (af) {
439 	case AF_INET:
440 		h = murmur3_32_hash32((uint32_t *)&addr->v4,
441 		    sizeof(addr->v4)/sizeof(uint32_t), V_pf_hashseed);
442 		break;
443 	case AF_INET6:
444 		h = murmur3_32_hash32((uint32_t *)&addr->v6,
445 		    sizeof(addr->v6)/sizeof(uint32_t), V_pf_hashseed);
446 		break;
447 	default:
448 		panic("%s: unknown address family %u", __func__, af);
449 	}
450 
451 	return (h & pf_srchashmask);
452 }
453 
454 #ifdef ALTQ
455 static int
456 pf_state_hash(struct pf_state *s)
457 {
458 	u_int32_t hv = (intptr_t)s / sizeof(*s);
459 
460 	hv ^= crc32(&s->src, sizeof(s->src));
461 	hv ^= crc32(&s->dst, sizeof(s->dst));
462 	if (hv == 0)
463 		hv = 1;
464 	return (hv);
465 }
466 #endif
467 
468 #ifdef INET6
469 void
470 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
471 {
472 	switch (af) {
473 #ifdef INET
474 	case AF_INET:
475 		dst->addr32[0] = src->addr32[0];
476 		break;
477 #endif /* INET */
478 	case AF_INET6:
479 		dst->addr32[0] = src->addr32[0];
480 		dst->addr32[1] = src->addr32[1];
481 		dst->addr32[2] = src->addr32[2];
482 		dst->addr32[3] = src->addr32[3];
483 		break;
484 	}
485 }
486 #endif /* INET6 */
487 
488 static void
489 pf_init_threshold(struct pf_threshold *threshold,
490     u_int32_t limit, u_int32_t seconds)
491 {
492 	threshold->limit = limit * PF_THRESHOLD_MULT;
493 	threshold->seconds = seconds;
494 	threshold->count = 0;
495 	threshold->last = time_uptime;
496 }
497 
498 static void
499 pf_add_threshold(struct pf_threshold *threshold)
500 {
501 	u_int32_t t = time_uptime, diff = t - threshold->last;
502 
503 	if (diff >= threshold->seconds)
504 		threshold->count = 0;
505 	else
506 		threshold->count -= threshold->count * diff /
507 		    threshold->seconds;
508 	threshold->count += PF_THRESHOLD_MULT;
509 	threshold->last = t;
510 }
511 
512 static int
513 pf_check_threshold(struct pf_threshold *threshold)
514 {
515 	return (threshold->count > threshold->limit);
516 }
517 
518 static int
519 pf_src_connlimit(struct pf_state **state)
520 {
521 	struct pf_overload_entry *pfoe;
522 	int bad = 0;
523 
524 	PF_STATE_LOCK_ASSERT(*state);
525 
526 	(*state)->src_node->conn++;
527 	(*state)->src.tcp_est = 1;
528 	pf_add_threshold(&(*state)->src_node->conn_rate);
529 
530 	if ((*state)->rule.ptr->max_src_conn &&
531 	    (*state)->rule.ptr->max_src_conn <
532 	    (*state)->src_node->conn) {
533 		counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONN], 1);
534 		bad++;
535 	}
536 
537 	if ((*state)->rule.ptr->max_src_conn_rate.limit &&
538 	    pf_check_threshold(&(*state)->src_node->conn_rate)) {
539 		counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONNRATE], 1);
540 		bad++;
541 	}
542 
543 	if (!bad)
544 		return (0);
545 
546 	/* Kill this state. */
547 	(*state)->timeout = PFTM_PURGE;
548 	(*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
549 
550 	if ((*state)->rule.ptr->overload_tbl == NULL)
551 		return (1);
552 
553 	/* Schedule overloading and flushing task. */
554 	pfoe = malloc(sizeof(*pfoe), M_PFTEMP, M_NOWAIT);
555 	if (pfoe == NULL)
556 		return (1);	/* too bad :( */
557 
558 	bcopy(&(*state)->src_node->addr, &pfoe->addr, sizeof(pfoe->addr));
559 	pfoe->af = (*state)->key[PF_SK_WIRE]->af;
560 	pfoe->rule = (*state)->rule.ptr;
561 	pfoe->dir = (*state)->direction;
562 	PF_OVERLOADQ_LOCK();
563 	SLIST_INSERT_HEAD(&V_pf_overloadqueue, pfoe, next);
564 	PF_OVERLOADQ_UNLOCK();
565 	taskqueue_enqueue(taskqueue_swi, &V_pf_overloadtask);
566 
567 	return (1);
568 }
569 
570 static void
571 pf_overload_task(void *v, int pending)
572 {
573 	struct pf_overload_head queue;
574 	struct pfr_addr p;
575 	struct pf_overload_entry *pfoe, *pfoe1;
576 	uint32_t killed = 0;
577 
578 	CURVNET_SET((struct vnet *)v);
579 
580 	PF_OVERLOADQ_LOCK();
581 	queue = V_pf_overloadqueue;
582 	SLIST_INIT(&V_pf_overloadqueue);
583 	PF_OVERLOADQ_UNLOCK();
584 
585 	bzero(&p, sizeof(p));
586 	SLIST_FOREACH(pfoe, &queue, next) {
587 		counter_u64_add(V_pf_status.lcounters[LCNT_OVERLOAD_TABLE], 1);
588 		if (V_pf_status.debug >= PF_DEBUG_MISC) {
589 			printf("%s: blocking address ", __func__);
590 			pf_print_host(&pfoe->addr, 0, pfoe->af);
591 			printf("\n");
592 		}
593 
594 		p.pfra_af = pfoe->af;
595 		switch (pfoe->af) {
596 #ifdef INET
597 		case AF_INET:
598 			p.pfra_net = 32;
599 			p.pfra_ip4addr = pfoe->addr.v4;
600 			break;
601 #endif
602 #ifdef INET6
603 		case AF_INET6:
604 			p.pfra_net = 128;
605 			p.pfra_ip6addr = pfoe->addr.v6;
606 			break;
607 #endif
608 		}
609 
610 		PF_RULES_WLOCK();
611 		pfr_insert_kentry(pfoe->rule->overload_tbl, &p, time_second);
612 		PF_RULES_WUNLOCK();
613 	}
614 
615 	/*
616 	 * Remove those entries, that don't need flushing.
617 	 */
618 	SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1)
619 		if (pfoe->rule->flush == 0) {
620 			SLIST_REMOVE(&queue, pfoe, pf_overload_entry, next);
621 			free(pfoe, M_PFTEMP);
622 		} else
623 			counter_u64_add(
624 			    V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH], 1);
625 
626 	/* If nothing to flush, return. */
627 	if (SLIST_EMPTY(&queue)) {
628 		CURVNET_RESTORE();
629 		return;
630 	}
631 
632 	for (int i = 0; i <= pf_hashmask; i++) {
633 		struct pf_idhash *ih = &V_pf_idhash[i];
634 		struct pf_state_key *sk;
635 		struct pf_state *s;
636 
637 		PF_HASHROW_LOCK(ih);
638 		LIST_FOREACH(s, &ih->states, entry) {
639 		    sk = s->key[PF_SK_WIRE];
640 		    SLIST_FOREACH(pfoe, &queue, next)
641 			if (sk->af == pfoe->af &&
642 			    ((pfoe->rule->flush & PF_FLUSH_GLOBAL) ||
643 			    pfoe->rule == s->rule.ptr) &&
644 			    ((pfoe->dir == PF_OUT &&
645 			    PF_AEQ(&pfoe->addr, &sk->addr[1], sk->af)) ||
646 			    (pfoe->dir == PF_IN &&
647 			    PF_AEQ(&pfoe->addr, &sk->addr[0], sk->af)))) {
648 				s->timeout = PFTM_PURGE;
649 				s->src.state = s->dst.state = TCPS_CLOSED;
650 				killed++;
651 			}
652 		}
653 		PF_HASHROW_UNLOCK(ih);
654 	}
655 	SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1)
656 		free(pfoe, M_PFTEMP);
657 	if (V_pf_status.debug >= PF_DEBUG_MISC)
658 		printf("%s: %u states killed", __func__, killed);
659 
660 	CURVNET_RESTORE();
661 }
662 
663 /*
664  * Can return locked on failure, so that we can consistently
665  * allocate and insert a new one.
666  */
667 struct pf_src_node *
668 pf_find_src_node(struct pf_addr *src, struct pf_rule *rule, sa_family_t af,
669 	int returnlocked)
670 {
671 	struct pf_srchash *sh;
672 	struct pf_src_node *n;
673 
674 	counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_SEARCH], 1);
675 
676 	sh = &V_pf_srchash[pf_hashsrc(src, af)];
677 	PF_HASHROW_LOCK(sh);
678 	LIST_FOREACH(n, &sh->nodes, entry)
679 		if (n->rule.ptr == rule && n->af == af &&
680 		    ((af == AF_INET && n->addr.v4.s_addr == src->v4.s_addr) ||
681 		    (af == AF_INET6 && bcmp(&n->addr, src, sizeof(*src)) == 0)))
682 			break;
683 	if (n != NULL) {
684 		n->states++;
685 		PF_HASHROW_UNLOCK(sh);
686 	} else if (returnlocked == 0)
687 		PF_HASHROW_UNLOCK(sh);
688 
689 	return (n);
690 }
691 
692 static int
693 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
694     struct pf_addr *src, sa_family_t af)
695 {
696 
697 	KASSERT((rule->rule_flag & PFRULE_RULESRCTRACK ||
698 	    rule->rpool.opts & PF_POOL_STICKYADDR),
699 	    ("%s for non-tracking rule %p", __func__, rule));
700 
701 	if (*sn == NULL)
702 		*sn = pf_find_src_node(src, rule, af, 1);
703 
704 	if (*sn == NULL) {
705 		struct pf_srchash *sh = &V_pf_srchash[pf_hashsrc(src, af)];
706 
707 		PF_HASHROW_ASSERT(sh);
708 
709 		if (!rule->max_src_nodes ||
710 		    counter_u64_fetch(rule->src_nodes) < rule->max_src_nodes)
711 			(*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO);
712 		else
713 			counter_u64_add(V_pf_status.lcounters[LCNT_SRCNODES],
714 			    1);
715 		if ((*sn) == NULL) {
716 			PF_HASHROW_UNLOCK(sh);
717 			return (-1);
718 		}
719 
720 		pf_init_threshold(&(*sn)->conn_rate,
721 		    rule->max_src_conn_rate.limit,
722 		    rule->max_src_conn_rate.seconds);
723 
724 		(*sn)->af = af;
725 		(*sn)->rule.ptr = rule;
726 		PF_ACPY(&(*sn)->addr, src, af);
727 		LIST_INSERT_HEAD(&sh->nodes, *sn, entry);
728 		(*sn)->creation = time_uptime;
729 		(*sn)->ruletype = rule->action;
730 		(*sn)->states = 1;
731 		if ((*sn)->rule.ptr != NULL)
732 			counter_u64_add((*sn)->rule.ptr->src_nodes, 1);
733 		PF_HASHROW_UNLOCK(sh);
734 		counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_INSERT], 1);
735 	} else {
736 		if (rule->max_src_states &&
737 		    (*sn)->states >= rule->max_src_states) {
738 			counter_u64_add(V_pf_status.lcounters[LCNT_SRCSTATES],
739 			    1);
740 			return (-1);
741 		}
742 	}
743 	return (0);
744 }
745 
746 void
747 pf_unlink_src_node(struct pf_src_node *src)
748 {
749 
750 	PF_HASHROW_ASSERT(&V_pf_srchash[pf_hashsrc(&src->addr, src->af)]);
751 	LIST_REMOVE(src, entry);
752 	if (src->rule.ptr)
753 		counter_u64_add(src->rule.ptr->src_nodes, -1);
754 }
755 
756 u_int
757 pf_free_src_nodes(struct pf_src_node_list *head)
758 {
759 	struct pf_src_node *sn, *tmp;
760 	u_int count = 0;
761 
762 	LIST_FOREACH_SAFE(sn, head, entry, tmp) {
763 		uma_zfree(V_pf_sources_z, sn);
764 		count++;
765 	}
766 
767 	counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], count);
768 
769 	return (count);
770 }
771 
772 void
773 pf_mtag_initialize()
774 {
775 
776 	pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) +
777 	    sizeof(struct pf_mtag), NULL, NULL, pf_mtag_uminit, NULL,
778 	    UMA_ALIGN_PTR, 0);
779 }
780 
781 /* Per-vnet data storage structures initialization. */
782 void
783 pf_initialize()
784 {
785 	struct pf_keyhash	*kh;
786 	struct pf_idhash	*ih;
787 	struct pf_srchash	*sh;
788 	u_int i;
789 
790 	if (pf_hashsize == 0 || !powerof2(pf_hashsize))
791 		pf_hashsize = PF_HASHSIZ;
792 	if (pf_srchashsize == 0 || !powerof2(pf_srchashsize))
793 		pf_srchashsize = PF_HASHSIZ / 4;
794 
795 	V_pf_hashseed = arc4random();
796 
797 	/* States and state keys storage. */
798 	V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_state),
799 	    NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
800 	V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z;
801 	uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT);
802 	uma_zone_set_warning(V_pf_state_z, "PF states limit reached");
803 
804 	V_pf_state_key_z = uma_zcreate("pf state keys",
805 	    sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL,
806 	    UMA_ALIGN_PTR, 0);
807 	V_pf_keyhash = malloc(pf_hashsize * sizeof(struct pf_keyhash),
808 	    M_PFHASH, M_WAITOK | M_ZERO);
809 	V_pf_idhash = malloc(pf_hashsize * sizeof(struct pf_idhash),
810 	    M_PFHASH, M_WAITOK | M_ZERO);
811 	pf_hashmask = pf_hashsize - 1;
812 	for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask;
813 	    i++, kh++, ih++) {
814 		mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF | MTX_DUPOK);
815 		mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF);
816 	}
817 
818 	/* Source nodes. */
819 	V_pf_sources_z = uma_zcreate("pf source nodes",
820 	    sizeof(struct pf_src_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR,
821 	    0);
822 	V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z;
823 	uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT);
824 	uma_zone_set_warning(V_pf_sources_z, "PF source nodes limit reached");
825 	V_pf_srchash = malloc(pf_srchashsize * sizeof(struct pf_srchash),
826 	  M_PFHASH, M_WAITOK|M_ZERO);
827 	pf_srchashmask = pf_srchashsize - 1;
828 	for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++)
829 		mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF);
830 
831 	/* ALTQ */
832 	TAILQ_INIT(&V_pf_altqs[0]);
833 	TAILQ_INIT(&V_pf_altqs[1]);
834 	TAILQ_INIT(&V_pf_pabuf);
835 	V_pf_altqs_active = &V_pf_altqs[0];
836 	V_pf_altqs_inactive = &V_pf_altqs[1];
837 
838 	/* Send & overload+flush queues. */
839 	STAILQ_INIT(&V_pf_sendqueue);
840 	SLIST_INIT(&V_pf_overloadqueue);
841 	TASK_INIT(&V_pf_overloadtask, 0, pf_overload_task, curvnet);
842 
843 	/* Unlinked, but may be referenced rules. */
844 	TAILQ_INIT(&V_pf_unlinked_rules);
845 }
846 
847 void
848 pf_mtag_cleanup()
849 {
850 
851 	uma_zdestroy(pf_mtag_z);
852 }
853 
854 void
855 pf_cleanup()
856 {
857 	struct pf_keyhash	*kh;
858 	struct pf_idhash	*ih;
859 	struct pf_srchash	*sh;
860 	struct pf_send_entry	*pfse, *next;
861 	u_int i;
862 
863 	for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask;
864 	    i++, kh++, ih++) {
865 		KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty",
866 		    __func__));
867 		KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty",
868 		    __func__));
869 		mtx_destroy(&kh->lock);
870 		mtx_destroy(&ih->lock);
871 	}
872 	free(V_pf_keyhash, M_PFHASH);
873 	free(V_pf_idhash, M_PFHASH);
874 
875 	for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) {
876 		KASSERT(LIST_EMPTY(&sh->nodes),
877 		    ("%s: source node hash not empty", __func__));
878 		mtx_destroy(&sh->lock);
879 	}
880 	free(V_pf_srchash, M_PFHASH);
881 
882 	STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) {
883 		m_freem(pfse->pfse_m);
884 		free(pfse, M_PFTEMP);
885 	}
886 
887 	uma_zdestroy(V_pf_sources_z);
888 	uma_zdestroy(V_pf_state_z);
889 	uma_zdestroy(V_pf_state_key_z);
890 }
891 
892 static int
893 pf_mtag_uminit(void *mem, int size, int how)
894 {
895 	struct m_tag *t;
896 
897 	t = (struct m_tag *)mem;
898 	t->m_tag_cookie = MTAG_ABI_COMPAT;
899 	t->m_tag_id = PACKET_TAG_PF;
900 	t->m_tag_len = sizeof(struct pf_mtag);
901 	t->m_tag_free = pf_mtag_free;
902 
903 	return (0);
904 }
905 
906 static void
907 pf_mtag_free(struct m_tag *t)
908 {
909 
910 	uma_zfree(pf_mtag_z, t);
911 }
912 
913 struct pf_mtag *
914 pf_get_mtag(struct mbuf *m)
915 {
916 	struct m_tag *mtag;
917 
918 	if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL)
919 		return ((struct pf_mtag *)(mtag + 1));
920 
921 	mtag = uma_zalloc(pf_mtag_z, M_NOWAIT);
922 	if (mtag == NULL)
923 		return (NULL);
924 	bzero(mtag + 1, sizeof(struct pf_mtag));
925 	m_tag_prepend(m, mtag);
926 
927 	return ((struct pf_mtag *)(mtag + 1));
928 }
929 
930 static int
931 pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks,
932     struct pf_state *s)
933 {
934 	struct pf_keyhash	*khs, *khw, *kh;
935 	struct pf_state_key	*sk, *cur;
936 	struct pf_state		*si, *olds = NULL;
937 	int idx;
938 
939 	KASSERT(s->refs == 0, ("%s: state not pristine", __func__));
940 	KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__));
941 	KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__));
942 
943 	/*
944 	 * We need to lock hash slots of both keys. To avoid deadlock
945 	 * we always lock the slot with lower address first. Unlock order
946 	 * isn't important.
947 	 *
948 	 * We also need to lock ID hash slot before dropping key
949 	 * locks. On success we return with ID hash slot locked.
950 	 */
951 
952 	if (skw == sks) {
953 		khs = khw = &V_pf_keyhash[pf_hashkey(skw)];
954 		PF_HASHROW_LOCK(khs);
955 	} else {
956 		khs = &V_pf_keyhash[pf_hashkey(sks)];
957 		khw = &V_pf_keyhash[pf_hashkey(skw)];
958 		if (khs == khw) {
959 			PF_HASHROW_LOCK(khs);
960 		} else if (khs < khw) {
961 			PF_HASHROW_LOCK(khs);
962 			PF_HASHROW_LOCK(khw);
963 		} else {
964 			PF_HASHROW_LOCK(khw);
965 			PF_HASHROW_LOCK(khs);
966 		}
967 	}
968 
969 #define	KEYS_UNLOCK()	do {			\
970 	if (khs != khw) {			\
971 		PF_HASHROW_UNLOCK(khs);		\
972 		PF_HASHROW_UNLOCK(khw);		\
973 	} else					\
974 		PF_HASHROW_UNLOCK(khs);		\
975 } while (0)
976 
977 	/*
978 	 * First run: start with wire key.
979 	 */
980 	sk = skw;
981 	kh = khw;
982 	idx = PF_SK_WIRE;
983 
984 keyattach:
985 	LIST_FOREACH(cur, &kh->keys, entry)
986 		if (bcmp(cur, sk, sizeof(struct pf_state_key_cmp)) == 0)
987 			break;
988 
989 	if (cur != NULL) {
990 		/* Key exists. Check for same kif, if none, add to key. */
991 		TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) {
992 			struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)];
993 
994 			PF_HASHROW_LOCK(ih);
995 			if (si->kif == s->kif &&
996 			    si->direction == s->direction) {
997 				if (sk->proto == IPPROTO_TCP &&
998 				    si->src.state >= TCPS_FIN_WAIT_2 &&
999 				    si->dst.state >= TCPS_FIN_WAIT_2) {
1000 					/*
1001 					 * New state matches an old >FIN_WAIT_2
1002 					 * state. We can't drop key hash locks,
1003 					 * thus we can't unlink it properly.
1004 					 *
1005 					 * As a workaround we drop it into
1006 					 * TCPS_CLOSED state, schedule purge
1007 					 * ASAP and push it into the very end
1008 					 * of the slot TAILQ, so that it won't
1009 					 * conflict with our new state.
1010 					 */
1011 					si->src.state = si->dst.state =
1012 					    TCPS_CLOSED;
1013 					si->timeout = PFTM_PURGE;
1014 					olds = si;
1015 				} else {
1016 					if (V_pf_status.debug >= PF_DEBUG_MISC) {
1017 						printf("pf: %s key attach "
1018 						    "failed on %s: ",
1019 						    (idx == PF_SK_WIRE) ?
1020 						    "wire" : "stack",
1021 						    s->kif->pfik_name);
1022 						pf_print_state_parts(s,
1023 						    (idx == PF_SK_WIRE) ?
1024 						    sk : NULL,
1025 						    (idx == PF_SK_STACK) ?
1026 						    sk : NULL);
1027 						printf(", existing: ");
1028 						pf_print_state_parts(si,
1029 						    (idx == PF_SK_WIRE) ?
1030 						    sk : NULL,
1031 						    (idx == PF_SK_STACK) ?
1032 						    sk : NULL);
1033 						printf("\n");
1034 					}
1035 					PF_HASHROW_UNLOCK(ih);
1036 					KEYS_UNLOCK();
1037 					uma_zfree(V_pf_state_key_z, sk);
1038 					if (idx == PF_SK_STACK)
1039 						pf_detach_state(s);
1040 					return (EEXIST); /* collision! */
1041 				}
1042 			}
1043 			PF_HASHROW_UNLOCK(ih);
1044 		}
1045 		uma_zfree(V_pf_state_key_z, sk);
1046 		s->key[idx] = cur;
1047 	} else {
1048 		LIST_INSERT_HEAD(&kh->keys, sk, entry);
1049 		s->key[idx] = sk;
1050 	}
1051 
1052 stateattach:
1053 	/* List is sorted, if-bound states before floating. */
1054 	if (s->kif == V_pfi_all)
1055 		TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]);
1056 	else
1057 		TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]);
1058 
1059 	if (olds) {
1060 		TAILQ_REMOVE(&s->key[idx]->states[idx], olds, key_list[idx]);
1061 		TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], olds,
1062 		    key_list[idx]);
1063 		olds = NULL;
1064 	}
1065 
1066 	/*
1067 	 * Attach done. See how should we (or should not?)
1068 	 * attach a second key.
1069 	 */
1070 	if (sks == skw) {
1071 		s->key[PF_SK_STACK] = s->key[PF_SK_WIRE];
1072 		idx = PF_SK_STACK;
1073 		sks = NULL;
1074 		goto stateattach;
1075 	} else if (sks != NULL) {
1076 		/*
1077 		 * Continue attaching with stack key.
1078 		 */
1079 		sk = sks;
1080 		kh = khs;
1081 		idx = PF_SK_STACK;
1082 		sks = NULL;
1083 		goto keyattach;
1084 	}
1085 
1086 	PF_STATE_LOCK(s);
1087 	KEYS_UNLOCK();
1088 
1089 	KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL,
1090 	    ("%s failure", __func__));
1091 
1092 	return (0);
1093 #undef	KEYS_UNLOCK
1094 }
1095 
1096 static void
1097 pf_detach_state(struct pf_state *s)
1098 {
1099 	struct pf_state_key *sks = s->key[PF_SK_STACK];
1100 	struct pf_keyhash *kh;
1101 
1102 	if (sks != NULL) {
1103 		kh = &V_pf_keyhash[pf_hashkey(sks)];
1104 		PF_HASHROW_LOCK(kh);
1105 		if (s->key[PF_SK_STACK] != NULL)
1106 			pf_state_key_detach(s, PF_SK_STACK);
1107 		/*
1108 		 * If both point to same key, then we are done.
1109 		 */
1110 		if (sks == s->key[PF_SK_WIRE]) {
1111 			pf_state_key_detach(s, PF_SK_WIRE);
1112 			PF_HASHROW_UNLOCK(kh);
1113 			return;
1114 		}
1115 		PF_HASHROW_UNLOCK(kh);
1116 	}
1117 
1118 	if (s->key[PF_SK_WIRE] != NULL) {
1119 		kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])];
1120 		PF_HASHROW_LOCK(kh);
1121 		if (s->key[PF_SK_WIRE] != NULL)
1122 			pf_state_key_detach(s, PF_SK_WIRE);
1123 		PF_HASHROW_UNLOCK(kh);
1124 	}
1125 }
1126 
1127 static void
1128 pf_state_key_detach(struct pf_state *s, int idx)
1129 {
1130 	struct pf_state_key *sk = s->key[idx];
1131 #ifdef INVARIANTS
1132 	struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)];
1133 
1134 	PF_HASHROW_ASSERT(kh);
1135 #endif
1136 	TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]);
1137 	s->key[idx] = NULL;
1138 
1139 	if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) {
1140 		LIST_REMOVE(sk, entry);
1141 		uma_zfree(V_pf_state_key_z, sk);
1142 	}
1143 }
1144 
1145 static int
1146 pf_state_key_ctor(void *mem, int size, void *arg, int flags)
1147 {
1148 	struct pf_state_key *sk = mem;
1149 
1150 	bzero(sk, sizeof(struct pf_state_key_cmp));
1151 	TAILQ_INIT(&sk->states[PF_SK_WIRE]);
1152 	TAILQ_INIT(&sk->states[PF_SK_STACK]);
1153 
1154 	return (0);
1155 }
1156 
1157 struct pf_state_key *
1158 pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr,
1159 	struct pf_addr *daddr, u_int16_t sport, u_int16_t dport)
1160 {
1161 	struct pf_state_key *sk;
1162 
1163 	sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT);
1164 	if (sk == NULL)
1165 		return (NULL);
1166 
1167 	PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af);
1168 	PF_ACPY(&sk->addr[pd->didx], daddr, pd->af);
1169 	sk->port[pd->sidx] = sport;
1170 	sk->port[pd->didx] = dport;
1171 	sk->proto = pd->proto;
1172 	sk->af = pd->af;
1173 
1174 	return (sk);
1175 }
1176 
1177 struct pf_state_key *
1178 pf_state_key_clone(struct pf_state_key *orig)
1179 {
1180 	struct pf_state_key *sk;
1181 
1182 	sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT);
1183 	if (sk == NULL)
1184 		return (NULL);
1185 
1186 	bcopy(orig, sk, sizeof(struct pf_state_key_cmp));
1187 
1188 	return (sk);
1189 }
1190 
1191 int
1192 pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw,
1193     struct pf_state_key *sks, struct pf_state *s)
1194 {
1195 	struct pf_idhash *ih;
1196 	struct pf_state *cur;
1197 	int error;
1198 
1199 	KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]),
1200 	    ("%s: sks not pristine", __func__));
1201 	KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]),
1202 	    ("%s: skw not pristine", __func__));
1203 	KASSERT(s->refs == 0, ("%s: state not pristine", __func__));
1204 
1205 	s->kif = kif;
1206 
1207 	if (s->id == 0 && s->creatorid == 0) {
1208 		/* XXX: should be atomic, but probability of collision low */
1209 		if ((s->id = V_pf_stateid[curcpu]++) == PFID_MAXID)
1210 			V_pf_stateid[curcpu] = 1;
1211 		s->id |= (uint64_t )curcpu << PFID_CPUSHIFT;
1212 		s->id = htobe64(s->id);
1213 		s->creatorid = V_pf_status.hostid;
1214 	}
1215 
1216 	/* Returns with ID locked on success. */
1217 	if ((error = pf_state_key_attach(skw, sks, s)) != 0)
1218 		return (error);
1219 
1220 	ih = &V_pf_idhash[PF_IDHASH(s)];
1221 	PF_HASHROW_ASSERT(ih);
1222 	LIST_FOREACH(cur, &ih->states, entry)
1223 		if (cur->id == s->id && cur->creatorid == s->creatorid)
1224 			break;
1225 
1226 	if (cur != NULL) {
1227 		PF_HASHROW_UNLOCK(ih);
1228 		if (V_pf_status.debug >= PF_DEBUG_MISC) {
1229 			printf("pf: state ID collision: "
1230 			    "id: %016llx creatorid: %08x\n",
1231 			    (unsigned long long)be64toh(s->id),
1232 			    ntohl(s->creatorid));
1233 		}
1234 		pf_detach_state(s);
1235 		return (EEXIST);
1236 	}
1237 	LIST_INSERT_HEAD(&ih->states, s, entry);
1238 	/* One for keys, one for ID hash. */
1239 	refcount_init(&s->refs, 2);
1240 
1241 	counter_u64_add(V_pf_status.fcounters[FCNT_STATE_INSERT], 1);
1242 	if (pfsync_insert_state_ptr != NULL)
1243 		pfsync_insert_state_ptr(s);
1244 
1245 	/* Returns locked. */
1246 	return (0);
1247 }
1248 
1249 /*
1250  * Find state by ID: returns with locked row on success.
1251  */
1252 struct pf_state *
1253 pf_find_state_byid(uint64_t id, uint32_t creatorid)
1254 {
1255 	struct pf_idhash *ih;
1256 	struct pf_state *s;
1257 
1258 	counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1);
1259 
1260 	ih = &V_pf_idhash[(be64toh(id) % (pf_hashmask + 1))];
1261 
1262 	PF_HASHROW_LOCK(ih);
1263 	LIST_FOREACH(s, &ih->states, entry)
1264 		if (s->id == id && s->creatorid == creatorid)
1265 			break;
1266 
1267 	if (s == NULL)
1268 		PF_HASHROW_UNLOCK(ih);
1269 
1270 	return (s);
1271 }
1272 
1273 /*
1274  * Find state by key.
1275  * Returns with ID hash slot locked on success.
1276  */
1277 static struct pf_state *
1278 pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir)
1279 {
1280 	struct pf_keyhash	*kh;
1281 	struct pf_state_key	*sk;
1282 	struct pf_state		*s;
1283 	int idx;
1284 
1285 	counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1);
1286 
1287 	kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)];
1288 
1289 	PF_HASHROW_LOCK(kh);
1290 	LIST_FOREACH(sk, &kh->keys, entry)
1291 		if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0)
1292 			break;
1293 	if (sk == NULL) {
1294 		PF_HASHROW_UNLOCK(kh);
1295 		return (NULL);
1296 	}
1297 
1298 	idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK);
1299 
1300 	/* List is sorted, if-bound states before floating ones. */
1301 	TAILQ_FOREACH(s, &sk->states[idx], key_list[idx])
1302 		if (s->kif == V_pfi_all || s->kif == kif) {
1303 			PF_STATE_LOCK(s);
1304 			PF_HASHROW_UNLOCK(kh);
1305 			if (s->timeout >= PFTM_MAX) {
1306 				/*
1307 				 * State is either being processed by
1308 				 * pf_unlink_state() in an other thread, or
1309 				 * is scheduled for immediate expiry.
1310 				 */
1311 				PF_STATE_UNLOCK(s);
1312 				return (NULL);
1313 			}
1314 			return (s);
1315 		}
1316 	PF_HASHROW_UNLOCK(kh);
1317 
1318 	return (NULL);
1319 }
1320 
1321 struct pf_state *
1322 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more)
1323 {
1324 	struct pf_keyhash	*kh;
1325 	struct pf_state_key	*sk;
1326 	struct pf_state		*s, *ret = NULL;
1327 	int			 idx, inout = 0;
1328 
1329 	counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1);
1330 
1331 	kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)];
1332 
1333 	PF_HASHROW_LOCK(kh);
1334 	LIST_FOREACH(sk, &kh->keys, entry)
1335 		if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0)
1336 			break;
1337 	if (sk == NULL) {
1338 		PF_HASHROW_UNLOCK(kh);
1339 		return (NULL);
1340 	}
1341 	switch (dir) {
1342 	case PF_IN:
1343 		idx = PF_SK_WIRE;
1344 		break;
1345 	case PF_OUT:
1346 		idx = PF_SK_STACK;
1347 		break;
1348 	case PF_INOUT:
1349 		idx = PF_SK_WIRE;
1350 		inout = 1;
1351 		break;
1352 	default:
1353 		panic("%s: dir %u", __func__, dir);
1354 	}
1355 second_run:
1356 	TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) {
1357 		if (more == NULL) {
1358 			PF_HASHROW_UNLOCK(kh);
1359 			return (s);
1360 		}
1361 
1362 		if (ret)
1363 			(*more)++;
1364 		else
1365 			ret = s;
1366 	}
1367 	if (inout == 1) {
1368 		inout = 0;
1369 		idx = PF_SK_STACK;
1370 		goto second_run;
1371 	}
1372 	PF_HASHROW_UNLOCK(kh);
1373 
1374 	return (ret);
1375 }
1376 
1377 /* END state table stuff */
1378 
1379 static void
1380 pf_send(struct pf_send_entry *pfse)
1381 {
1382 
1383 	PF_SENDQ_LOCK();
1384 	STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next);
1385 	PF_SENDQ_UNLOCK();
1386 	swi_sched(V_pf_swi_cookie, 0);
1387 }
1388 
1389 void
1390 pf_intr(void *v)
1391 {
1392 	struct pf_send_head queue;
1393 	struct pf_send_entry *pfse, *next;
1394 
1395 	CURVNET_SET((struct vnet *)v);
1396 
1397 	PF_SENDQ_LOCK();
1398 	queue = V_pf_sendqueue;
1399 	STAILQ_INIT(&V_pf_sendqueue);
1400 	PF_SENDQ_UNLOCK();
1401 
1402 	STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) {
1403 		switch (pfse->pfse_type) {
1404 #ifdef INET
1405 		case PFSE_IP:
1406 			ip_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL);
1407 			break;
1408 		case PFSE_ICMP:
1409 			icmp_error(pfse->pfse_m, pfse->icmpopts.type,
1410 			    pfse->icmpopts.code, 0, pfse->icmpopts.mtu);
1411 			break;
1412 #endif /* INET */
1413 #ifdef INET6
1414 		case PFSE_IP6:
1415 			ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL,
1416 			    NULL);
1417 			break;
1418 		case PFSE_ICMP6:
1419 			icmp6_error(pfse->pfse_m, pfse->icmpopts.type,
1420 			    pfse->icmpopts.code, pfse->icmpopts.mtu);
1421 			break;
1422 #endif /* INET6 */
1423 		default:
1424 			panic("%s: unknown type", __func__);
1425 		}
1426 		free(pfse, M_PFTEMP);
1427 	}
1428 	CURVNET_RESTORE();
1429 }
1430 
1431 void
1432 pf_purge_thread(void *unused __unused)
1433 {
1434 	VNET_ITERATOR_DECL(vnet_iter);
1435 
1436 	sx_xlock(&pf_end_lock);
1437 	while (pf_end_threads == 0) {
1438 		sx_sleep(pf_purge_thread, &pf_end_lock, 0, "pftm", hz / 10);
1439 
1440 		VNET_LIST_RLOCK();
1441 		VNET_FOREACH(vnet_iter) {
1442 			CURVNET_SET(vnet_iter);
1443 
1444 
1445 			/* Wait until V_pf_default_rule is initialized. */
1446 			if (V_pf_vnet_active == 0) {
1447 				CURVNET_RESTORE();
1448 				continue;
1449 			}
1450 
1451 			/*
1452 			 *  Process 1/interval fraction of the state
1453 			 * table every run.
1454 			 */
1455 			V_pf_purge_idx =
1456 			    pf_purge_expired_states(V_pf_purge_idx, pf_hashmask /
1457 			    (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10));
1458 
1459 			/*
1460 			 * Purge other expired types every
1461 			 * PFTM_INTERVAL seconds.
1462 			 */
1463 			if (V_pf_purge_idx == 0) {
1464 				/*
1465 				 * Order is important:
1466 				 * - states and src nodes reference rules
1467 				 * - states and rules reference kifs
1468 				 */
1469 				pf_purge_expired_fragments();
1470 				pf_purge_expired_src_nodes();
1471 				pf_purge_unlinked_rules();
1472 				pfi_kif_purge();
1473 			}
1474 			CURVNET_RESTORE();
1475 		}
1476 		VNET_LIST_RUNLOCK();
1477 	}
1478 
1479 	pf_end_threads++;
1480 	sx_xunlock(&pf_end_lock);
1481 	kproc_exit(0);
1482 }
1483 
1484 void
1485 pf_unload_vnet_purge(void)
1486 {
1487 
1488 	/*
1489 	 * To cleanse up all kifs and rules we need
1490 	 * two runs: first one clears reference flags,
1491 	 * then pf_purge_expired_states() doesn't
1492 	 * raise them, and then second run frees.
1493 	 */
1494 	pf_purge_unlinked_rules();
1495 	pfi_kif_purge();
1496 
1497 	/*
1498 	 * Now purge everything.
1499 	 */
1500 	pf_purge_expired_states(0, pf_hashmask);
1501 	pf_purge_expired_fragments();
1502 	pf_purge_expired_src_nodes();
1503 
1504 	/*
1505 	 * Now all kifs & rules should be unreferenced,
1506 	 * thus should be successfully freed.
1507 	 */
1508 	pf_purge_unlinked_rules();
1509 	pfi_kif_purge();
1510 }
1511 
1512 
1513 u_int32_t
1514 pf_state_expires(const struct pf_state *state)
1515 {
1516 	u_int32_t	timeout;
1517 	u_int32_t	start;
1518 	u_int32_t	end;
1519 	u_int32_t	states;
1520 
1521 	/* handle all PFTM_* > PFTM_MAX here */
1522 	if (state->timeout == PFTM_PURGE)
1523 		return (time_uptime);
1524 	KASSERT(state->timeout != PFTM_UNLINKED,
1525 	    ("pf_state_expires: timeout == PFTM_UNLINKED"));
1526 	KASSERT((state->timeout < PFTM_MAX),
1527 	    ("pf_state_expires: timeout > PFTM_MAX"));
1528 	timeout = state->rule.ptr->timeout[state->timeout];
1529 	if (!timeout)
1530 		timeout = V_pf_default_rule.timeout[state->timeout];
1531 	start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
1532 	if (start) {
1533 		end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
1534 		states = counter_u64_fetch(state->rule.ptr->states_cur);
1535 	} else {
1536 		start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START];
1537 		end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END];
1538 		states = V_pf_status.states;
1539 	}
1540 	if (end && states > start && start < end) {
1541 		if (states < end)
1542 			return (state->expire + timeout * (end - states) /
1543 			    (end - start));
1544 		else
1545 			return (time_uptime);
1546 	}
1547 	return (state->expire + timeout);
1548 }
1549 
1550 void
1551 pf_purge_expired_src_nodes()
1552 {
1553 	struct pf_src_node_list	 freelist;
1554 	struct pf_srchash	*sh;
1555 	struct pf_src_node	*cur, *next;
1556 	int i;
1557 
1558 	LIST_INIT(&freelist);
1559 	for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) {
1560 	    PF_HASHROW_LOCK(sh);
1561 	    LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next)
1562 		if (cur->states == 0 && cur->expire <= time_uptime) {
1563 			pf_unlink_src_node(cur);
1564 			LIST_INSERT_HEAD(&freelist, cur, entry);
1565 		} else if (cur->rule.ptr != NULL)
1566 			cur->rule.ptr->rule_flag |= PFRULE_REFS;
1567 	    PF_HASHROW_UNLOCK(sh);
1568 	}
1569 
1570 	pf_free_src_nodes(&freelist);
1571 
1572 	V_pf_status.src_nodes = uma_zone_get_cur(V_pf_sources_z);
1573 }
1574 
1575 static void
1576 pf_src_tree_remove_state(struct pf_state *s)
1577 {
1578 	struct pf_src_node *sn;
1579 	struct pf_srchash *sh;
1580 	uint32_t timeout;
1581 
1582 	timeout = s->rule.ptr->timeout[PFTM_SRC_NODE] ?
1583 	    s->rule.ptr->timeout[PFTM_SRC_NODE] :
1584 	    V_pf_default_rule.timeout[PFTM_SRC_NODE];
1585 
1586 	if (s->src_node != NULL) {
1587 		sn = s->src_node;
1588 		sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)];
1589 	    	PF_HASHROW_LOCK(sh);
1590 		if (s->src.tcp_est)
1591 			--sn->conn;
1592 		if (--sn->states == 0)
1593 			sn->expire = time_uptime + timeout;
1594 	    	PF_HASHROW_UNLOCK(sh);
1595 	}
1596 	if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
1597 		sn = s->nat_src_node;
1598 		sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)];
1599 	    	PF_HASHROW_LOCK(sh);
1600 		if (--sn->states == 0)
1601 			sn->expire = time_uptime + timeout;
1602 	    	PF_HASHROW_UNLOCK(sh);
1603 	}
1604 	s->src_node = s->nat_src_node = NULL;
1605 }
1606 
1607 /*
1608  * Unlink and potentilly free a state. Function may be
1609  * called with ID hash row locked, but always returns
1610  * unlocked, since it needs to go through key hash locking.
1611  */
1612 int
1613 pf_unlink_state(struct pf_state *s, u_int flags)
1614 {
1615 	struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)];
1616 
1617 	if ((flags & PF_ENTER_LOCKED) == 0)
1618 		PF_HASHROW_LOCK(ih);
1619 	else
1620 		PF_HASHROW_ASSERT(ih);
1621 
1622 	if (s->timeout == PFTM_UNLINKED) {
1623 		/*
1624 		 * State is being processed
1625 		 * by pf_unlink_state() in
1626 		 * an other thread.
1627 		 */
1628 		PF_HASHROW_UNLOCK(ih);
1629 		return (0);	/* XXXGL: undefined actually */
1630 	}
1631 
1632 	if (s->src.state == PF_TCPS_PROXY_DST) {
1633 		/* XXX wire key the right one? */
1634 		pf_send_tcp(NULL, s->rule.ptr, s->key[PF_SK_WIRE]->af,
1635 		    &s->key[PF_SK_WIRE]->addr[1],
1636 		    &s->key[PF_SK_WIRE]->addr[0],
1637 		    s->key[PF_SK_WIRE]->port[1],
1638 		    s->key[PF_SK_WIRE]->port[0],
1639 		    s->src.seqhi, s->src.seqlo + 1,
1640 		    TH_RST|TH_ACK, 0, 0, 0, 1, s->tag, NULL);
1641 	}
1642 
1643 	LIST_REMOVE(s, entry);
1644 	pf_src_tree_remove_state(s);
1645 
1646 	if (pfsync_delete_state_ptr != NULL)
1647 		pfsync_delete_state_ptr(s);
1648 
1649 	STATE_DEC_COUNTERS(s);
1650 
1651 	s->timeout = PFTM_UNLINKED;
1652 
1653 	PF_HASHROW_UNLOCK(ih);
1654 
1655 	pf_detach_state(s);
1656 	refcount_release(&s->refs);
1657 
1658 	return (pf_release_state(s));
1659 }
1660 
1661 void
1662 pf_free_state(struct pf_state *cur)
1663 {
1664 
1665 	KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur));
1666 	KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__,
1667 	    cur->timeout));
1668 
1669 	pf_normalize_tcp_cleanup(cur);
1670 	uma_zfree(V_pf_state_z, cur);
1671 	counter_u64_add(V_pf_status.fcounters[FCNT_STATE_REMOVALS], 1);
1672 }
1673 
1674 /*
1675  * Called only from pf_purge_thread(), thus serialized.
1676  */
1677 static u_int
1678 pf_purge_expired_states(u_int i, int maxcheck)
1679 {
1680 	struct pf_idhash *ih;
1681 	struct pf_state *s;
1682 
1683 	V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
1684 
1685 	/*
1686 	 * Go through hash and unlink states that expire now.
1687 	 */
1688 	while (maxcheck > 0) {
1689 
1690 		ih = &V_pf_idhash[i];
1691 relock:
1692 		PF_HASHROW_LOCK(ih);
1693 		LIST_FOREACH(s, &ih->states, entry) {
1694 			if (pf_state_expires(s) <= time_uptime) {
1695 				V_pf_status.states -=
1696 				    pf_unlink_state(s, PF_ENTER_LOCKED);
1697 				goto relock;
1698 			}
1699 			s->rule.ptr->rule_flag |= PFRULE_REFS;
1700 			if (s->nat_rule.ptr != NULL)
1701 				s->nat_rule.ptr->rule_flag |= PFRULE_REFS;
1702 			if (s->anchor.ptr != NULL)
1703 				s->anchor.ptr->rule_flag |= PFRULE_REFS;
1704 			s->kif->pfik_flags |= PFI_IFLAG_REFS;
1705 			if (s->rt_kif)
1706 				s->rt_kif->pfik_flags |= PFI_IFLAG_REFS;
1707 		}
1708 		PF_HASHROW_UNLOCK(ih);
1709 
1710 		/* Return when we hit end of hash. */
1711 		if (++i > pf_hashmask) {
1712 			V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
1713 			return (0);
1714 		}
1715 
1716 		maxcheck--;
1717 	}
1718 
1719 	V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
1720 
1721 	return (i);
1722 }
1723 
1724 static void
1725 pf_purge_unlinked_rules()
1726 {
1727 	struct pf_rulequeue tmpq;
1728 	struct pf_rule *r, *r1;
1729 
1730 	/*
1731 	 * If we have overloading task pending, then we'd
1732 	 * better skip purging this time. There is a tiny
1733 	 * probability that overloading task references
1734 	 * an already unlinked rule.
1735 	 */
1736 	PF_OVERLOADQ_LOCK();
1737 	if (!SLIST_EMPTY(&V_pf_overloadqueue)) {
1738 		PF_OVERLOADQ_UNLOCK();
1739 		return;
1740 	}
1741 	PF_OVERLOADQ_UNLOCK();
1742 
1743 	/*
1744 	 * Do naive mark-and-sweep garbage collecting of old rules.
1745 	 * Reference flag is raised by pf_purge_expired_states()
1746 	 * and pf_purge_expired_src_nodes().
1747 	 *
1748 	 * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK,
1749 	 * use a temporary queue.
1750 	 */
1751 	TAILQ_INIT(&tmpq);
1752 	PF_UNLNKDRULES_LOCK();
1753 	TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) {
1754 		if (!(r->rule_flag & PFRULE_REFS)) {
1755 			TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries);
1756 			TAILQ_INSERT_TAIL(&tmpq, r, entries);
1757 		} else
1758 			r->rule_flag &= ~PFRULE_REFS;
1759 	}
1760 	PF_UNLNKDRULES_UNLOCK();
1761 
1762 	if (!TAILQ_EMPTY(&tmpq)) {
1763 		PF_RULES_WLOCK();
1764 		TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) {
1765 			TAILQ_REMOVE(&tmpq, r, entries);
1766 			pf_free_rule(r);
1767 		}
1768 		PF_RULES_WUNLOCK();
1769 	}
1770 }
1771 
1772 void
1773 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
1774 {
1775 	switch (af) {
1776 #ifdef INET
1777 	case AF_INET: {
1778 		u_int32_t a = ntohl(addr->addr32[0]);
1779 		printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
1780 		    (a>>8)&255, a&255);
1781 		if (p) {
1782 			p = ntohs(p);
1783 			printf(":%u", p);
1784 		}
1785 		break;
1786 	}
1787 #endif /* INET */
1788 #ifdef INET6
1789 	case AF_INET6: {
1790 		u_int16_t b;
1791 		u_int8_t i, curstart, curend, maxstart, maxend;
1792 		curstart = curend = maxstart = maxend = 255;
1793 		for (i = 0; i < 8; i++) {
1794 			if (!addr->addr16[i]) {
1795 				if (curstart == 255)
1796 					curstart = i;
1797 				curend = i;
1798 			} else {
1799 				if ((curend - curstart) >
1800 				    (maxend - maxstart)) {
1801 					maxstart = curstart;
1802 					maxend = curend;
1803 				}
1804 				curstart = curend = 255;
1805 			}
1806 		}
1807 		if ((curend - curstart) >
1808 		    (maxend - maxstart)) {
1809 			maxstart = curstart;
1810 			maxend = curend;
1811 		}
1812 		for (i = 0; i < 8; i++) {
1813 			if (i >= maxstart && i <= maxend) {
1814 				if (i == 0)
1815 					printf(":");
1816 				if (i == maxend)
1817 					printf(":");
1818 			} else {
1819 				b = ntohs(addr->addr16[i]);
1820 				printf("%x", b);
1821 				if (i < 7)
1822 					printf(":");
1823 			}
1824 		}
1825 		if (p) {
1826 			p = ntohs(p);
1827 			printf("[%u]", p);
1828 		}
1829 		break;
1830 	}
1831 #endif /* INET6 */
1832 	}
1833 }
1834 
1835 void
1836 pf_print_state(struct pf_state *s)
1837 {
1838 	pf_print_state_parts(s, NULL, NULL);
1839 }
1840 
1841 static void
1842 pf_print_state_parts(struct pf_state *s,
1843     struct pf_state_key *skwp, struct pf_state_key *sksp)
1844 {
1845 	struct pf_state_key *skw, *sks;
1846 	u_int8_t proto, dir;
1847 
1848 	/* Do our best to fill these, but they're skipped if NULL */
1849 	skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL);
1850 	sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL);
1851 	proto = skw ? skw->proto : (sks ? sks->proto : 0);
1852 	dir = s ? s->direction : 0;
1853 
1854 	switch (proto) {
1855 	case IPPROTO_IPV4:
1856 		printf("IPv4");
1857 		break;
1858 	case IPPROTO_IPV6:
1859 		printf("IPv6");
1860 		break;
1861 	case IPPROTO_TCP:
1862 		printf("TCP");
1863 		break;
1864 	case IPPROTO_UDP:
1865 		printf("UDP");
1866 		break;
1867 	case IPPROTO_ICMP:
1868 		printf("ICMP");
1869 		break;
1870 	case IPPROTO_ICMPV6:
1871 		printf("ICMPv6");
1872 		break;
1873 	default:
1874 		printf("%u", proto);
1875 		break;
1876 	}
1877 	switch (dir) {
1878 	case PF_IN:
1879 		printf(" in");
1880 		break;
1881 	case PF_OUT:
1882 		printf(" out");
1883 		break;
1884 	}
1885 	if (skw) {
1886 		printf(" wire: ");
1887 		pf_print_host(&skw->addr[0], skw->port[0], skw->af);
1888 		printf(" ");
1889 		pf_print_host(&skw->addr[1], skw->port[1], skw->af);
1890 	}
1891 	if (sks) {
1892 		printf(" stack: ");
1893 		if (sks != skw) {
1894 			pf_print_host(&sks->addr[0], sks->port[0], sks->af);
1895 			printf(" ");
1896 			pf_print_host(&sks->addr[1], sks->port[1], sks->af);
1897 		} else
1898 			printf("-");
1899 	}
1900 	if (s) {
1901 		if (proto == IPPROTO_TCP) {
1902 			printf(" [lo=%u high=%u win=%u modulator=%u",
1903 			    s->src.seqlo, s->src.seqhi,
1904 			    s->src.max_win, s->src.seqdiff);
1905 			if (s->src.wscale && s->dst.wscale)
1906 				printf(" wscale=%u",
1907 				    s->src.wscale & PF_WSCALE_MASK);
1908 			printf("]");
1909 			printf(" [lo=%u high=%u win=%u modulator=%u",
1910 			    s->dst.seqlo, s->dst.seqhi,
1911 			    s->dst.max_win, s->dst.seqdiff);
1912 			if (s->src.wscale && s->dst.wscale)
1913 				printf(" wscale=%u",
1914 				s->dst.wscale & PF_WSCALE_MASK);
1915 			printf("]");
1916 		}
1917 		printf(" %u:%u", s->src.state, s->dst.state);
1918 	}
1919 }
1920 
1921 void
1922 pf_print_flags(u_int8_t f)
1923 {
1924 	if (f)
1925 		printf(" ");
1926 	if (f & TH_FIN)
1927 		printf("F");
1928 	if (f & TH_SYN)
1929 		printf("S");
1930 	if (f & TH_RST)
1931 		printf("R");
1932 	if (f & TH_PUSH)
1933 		printf("P");
1934 	if (f & TH_ACK)
1935 		printf("A");
1936 	if (f & TH_URG)
1937 		printf("U");
1938 	if (f & TH_ECE)
1939 		printf("E");
1940 	if (f & TH_CWR)
1941 		printf("W");
1942 }
1943 
1944 #define	PF_SET_SKIP_STEPS(i)					\
1945 	do {							\
1946 		while (head[i] != cur) {			\
1947 			head[i]->skip[i].ptr = cur;		\
1948 			head[i] = TAILQ_NEXT(head[i], entries);	\
1949 		}						\
1950 	} while (0)
1951 
1952 void
1953 pf_calc_skip_steps(struct pf_rulequeue *rules)
1954 {
1955 	struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
1956 	int i;
1957 
1958 	cur = TAILQ_FIRST(rules);
1959 	prev = cur;
1960 	for (i = 0; i < PF_SKIP_COUNT; ++i)
1961 		head[i] = cur;
1962 	while (cur != NULL) {
1963 
1964 		if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
1965 			PF_SET_SKIP_STEPS(PF_SKIP_IFP);
1966 		if (cur->direction != prev->direction)
1967 			PF_SET_SKIP_STEPS(PF_SKIP_DIR);
1968 		if (cur->af != prev->af)
1969 			PF_SET_SKIP_STEPS(PF_SKIP_AF);
1970 		if (cur->proto != prev->proto)
1971 			PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
1972 		if (cur->src.neg != prev->src.neg ||
1973 		    pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
1974 			PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
1975 		if (cur->src.port[0] != prev->src.port[0] ||
1976 		    cur->src.port[1] != prev->src.port[1] ||
1977 		    cur->src.port_op != prev->src.port_op)
1978 			PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
1979 		if (cur->dst.neg != prev->dst.neg ||
1980 		    pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
1981 			PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
1982 		if (cur->dst.port[0] != prev->dst.port[0] ||
1983 		    cur->dst.port[1] != prev->dst.port[1] ||
1984 		    cur->dst.port_op != prev->dst.port_op)
1985 			PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
1986 
1987 		prev = cur;
1988 		cur = TAILQ_NEXT(cur, entries);
1989 	}
1990 	for (i = 0; i < PF_SKIP_COUNT; ++i)
1991 		PF_SET_SKIP_STEPS(i);
1992 }
1993 
1994 static int
1995 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
1996 {
1997 	if (aw1->type != aw2->type)
1998 		return (1);
1999 	switch (aw1->type) {
2000 	case PF_ADDR_ADDRMASK:
2001 	case PF_ADDR_RANGE:
2002 		if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, AF_INET6))
2003 			return (1);
2004 		if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, AF_INET6))
2005 			return (1);
2006 		return (0);
2007 	case PF_ADDR_DYNIFTL:
2008 		return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
2009 	case PF_ADDR_NOROUTE:
2010 	case PF_ADDR_URPFFAILED:
2011 		return (0);
2012 	case PF_ADDR_TABLE:
2013 		return (aw1->p.tbl != aw2->p.tbl);
2014 	default:
2015 		printf("invalid address type: %d\n", aw1->type);
2016 		return (1);
2017 	}
2018 }
2019 
2020 /**
2021  * Checksum updates are a little complicated because the checksum in the TCP/UDP
2022  * header isn't always a full checksum. In some cases (i.e. output) it's a
2023  * pseudo-header checksum, which is a partial checksum over src/dst IP
2024  * addresses, protocol number and length.
2025  *
2026  * That means we have the following cases:
2027  *  * Input or forwarding: we don't have TSO, the checksum fields are full
2028  *  	checksums, we need to update the checksum whenever we change anything.
2029  *  * Output (i.e. the checksum is a pseudo-header checksum):
2030  *  	x The field being updated is src/dst address or affects the length of
2031  *  	the packet. We need to update the pseudo-header checksum (note that this
2032  *  	checksum is not ones' complement).
2033  *  	x Some other field is being modified (e.g. src/dst port numbers): We
2034  *  	don't have to update anything.
2035  **/
2036 u_int16_t
2037 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
2038 {
2039 	u_int32_t	l;
2040 
2041 	if (udp && !cksum)
2042 		return (0x0000);
2043 	l = cksum + old - new;
2044 	l = (l >> 16) + (l & 65535);
2045 	l = l & 65535;
2046 	if (udp && !l)
2047 		return (0xFFFF);
2048 	return (l);
2049 }
2050 
2051 u_int16_t
2052 pf_proto_cksum_fixup(struct mbuf *m, u_int16_t cksum, u_int16_t old,
2053         u_int16_t new, u_int8_t udp)
2054 {
2055 	if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6))
2056 		return (cksum);
2057 
2058 	return (pf_cksum_fixup(cksum, old, new, udp));
2059 }
2060 
2061 static void
2062 pf_change_ap(struct mbuf *m, struct pf_addr *a, u_int16_t *p, u_int16_t *ic,
2063         u_int16_t *pc, struct pf_addr *an, u_int16_t pn, u_int8_t u,
2064         sa_family_t af)
2065 {
2066 	struct pf_addr	ao;
2067 	u_int16_t	po = *p;
2068 
2069 	PF_ACPY(&ao, a, af);
2070 	PF_ACPY(a, an, af);
2071 
2072 	if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6))
2073 		*pc = ~*pc;
2074 
2075 	*p = pn;
2076 
2077 	switch (af) {
2078 #ifdef INET
2079 	case AF_INET:
2080 		*ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
2081 		    ao.addr16[0], an->addr16[0], 0),
2082 		    ao.addr16[1], an->addr16[1], 0);
2083 		*p = pn;
2084 
2085 		*pc = pf_cksum_fixup(pf_cksum_fixup(*pc,
2086 		    ao.addr16[0], an->addr16[0], u),
2087 		    ao.addr16[1], an->addr16[1], u);
2088 
2089 		*pc = pf_proto_cksum_fixup(m, *pc, po, pn, u);
2090 		break;
2091 #endif /* INET */
2092 #ifdef INET6
2093 	case AF_INET6:
2094 		*pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2095 		    pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2096 		    pf_cksum_fixup(pf_cksum_fixup(*pc,
2097 		    ao.addr16[0], an->addr16[0], u),
2098 		    ao.addr16[1], an->addr16[1], u),
2099 		    ao.addr16[2], an->addr16[2], u),
2100 		    ao.addr16[3], an->addr16[3], u),
2101 		    ao.addr16[4], an->addr16[4], u),
2102 		    ao.addr16[5], an->addr16[5], u),
2103 		    ao.addr16[6], an->addr16[6], u),
2104 		    ao.addr16[7], an->addr16[7], u);
2105 
2106 		*pc = pf_proto_cksum_fixup(m, *pc, po, pn, u);
2107 		break;
2108 #endif /* INET6 */
2109 	}
2110 
2111 	if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA |
2112 	    CSUM_DELAY_DATA_IPV6)) {
2113 		*pc = ~*pc;
2114 		if (! *pc)
2115 			*pc = 0xffff;
2116 	}
2117 }
2118 
2119 /* Changes a u_int32_t.  Uses a void * so there are no align restrictions */
2120 void
2121 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
2122 {
2123 	u_int32_t	ao;
2124 
2125 	memcpy(&ao, a, sizeof(ao));
2126 	memcpy(a, &an, sizeof(u_int32_t));
2127 	*c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
2128 	    ao % 65536, an % 65536, u);
2129 }
2130 
2131 void
2132 pf_change_proto_a(struct mbuf *m, void *a, u_int16_t *c, u_int32_t an, u_int8_t udp)
2133 {
2134 	u_int32_t	ao;
2135 
2136 	memcpy(&ao, a, sizeof(ao));
2137 	memcpy(a, &an, sizeof(u_int32_t));
2138 
2139 	*c = pf_proto_cksum_fixup(m,
2140 	    pf_proto_cksum_fixup(m, *c, ao / 65536, an / 65536, udp),
2141 	    ao % 65536, an % 65536, udp);
2142 }
2143 
2144 #ifdef INET6
2145 static void
2146 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
2147 {
2148 	struct pf_addr	ao;
2149 
2150 	PF_ACPY(&ao, a, AF_INET6);
2151 	PF_ACPY(a, an, AF_INET6);
2152 
2153 	*c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2154 	    pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2155 	    pf_cksum_fixup(pf_cksum_fixup(*c,
2156 	    ao.addr16[0], an->addr16[0], u),
2157 	    ao.addr16[1], an->addr16[1], u),
2158 	    ao.addr16[2], an->addr16[2], u),
2159 	    ao.addr16[3], an->addr16[3], u),
2160 	    ao.addr16[4], an->addr16[4], u),
2161 	    ao.addr16[5], an->addr16[5], u),
2162 	    ao.addr16[6], an->addr16[6], u),
2163 	    ao.addr16[7], an->addr16[7], u);
2164 }
2165 #endif /* INET6 */
2166 
2167 static void
2168 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
2169     struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
2170     u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
2171 {
2172 	struct pf_addr	oia, ooa;
2173 
2174 	PF_ACPY(&oia, ia, af);
2175 	if (oa)
2176 		PF_ACPY(&ooa, oa, af);
2177 
2178 	/* Change inner protocol port, fix inner protocol checksum. */
2179 	if (ip != NULL) {
2180 		u_int16_t	oip = *ip;
2181 		u_int32_t	opc;
2182 
2183 		if (pc != NULL)
2184 			opc = *pc;
2185 		*ip = np;
2186 		if (pc != NULL)
2187 			*pc = pf_cksum_fixup(*pc, oip, *ip, u);
2188 		*ic = pf_cksum_fixup(*ic, oip, *ip, 0);
2189 		if (pc != NULL)
2190 			*ic = pf_cksum_fixup(*ic, opc, *pc, 0);
2191 	}
2192 	/* Change inner ip address, fix inner ip and icmp checksums. */
2193 	PF_ACPY(ia, na, af);
2194 	switch (af) {
2195 #ifdef INET
2196 	case AF_INET: {
2197 		u_int32_t	 oh2c = *h2c;
2198 
2199 		*h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
2200 		    oia.addr16[0], ia->addr16[0], 0),
2201 		    oia.addr16[1], ia->addr16[1], 0);
2202 		*ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
2203 		    oia.addr16[0], ia->addr16[0], 0),
2204 		    oia.addr16[1], ia->addr16[1], 0);
2205 		*ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
2206 		break;
2207 	}
2208 #endif /* INET */
2209 #ifdef INET6
2210 	case AF_INET6:
2211 		*ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2212 		    pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2213 		    pf_cksum_fixup(pf_cksum_fixup(*ic,
2214 		    oia.addr16[0], ia->addr16[0], u),
2215 		    oia.addr16[1], ia->addr16[1], u),
2216 		    oia.addr16[2], ia->addr16[2], u),
2217 		    oia.addr16[3], ia->addr16[3], u),
2218 		    oia.addr16[4], ia->addr16[4], u),
2219 		    oia.addr16[5], ia->addr16[5], u),
2220 		    oia.addr16[6], ia->addr16[6], u),
2221 		    oia.addr16[7], ia->addr16[7], u);
2222 		break;
2223 #endif /* INET6 */
2224 	}
2225 	/* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */
2226 	if (oa) {
2227 		PF_ACPY(oa, na, af);
2228 		switch (af) {
2229 #ifdef INET
2230 		case AF_INET:
2231 			*hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
2232 			    ooa.addr16[0], oa->addr16[0], 0),
2233 			    ooa.addr16[1], oa->addr16[1], 0);
2234 			break;
2235 #endif /* INET */
2236 #ifdef INET6
2237 		case AF_INET6:
2238 			*ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2239 			    pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2240 			    pf_cksum_fixup(pf_cksum_fixup(*ic,
2241 			    ooa.addr16[0], oa->addr16[0], u),
2242 			    ooa.addr16[1], oa->addr16[1], u),
2243 			    ooa.addr16[2], oa->addr16[2], u),
2244 			    ooa.addr16[3], oa->addr16[3], u),
2245 			    ooa.addr16[4], oa->addr16[4], u),
2246 			    ooa.addr16[5], oa->addr16[5], u),
2247 			    ooa.addr16[6], oa->addr16[6], u),
2248 			    ooa.addr16[7], oa->addr16[7], u);
2249 			break;
2250 #endif /* INET6 */
2251 		}
2252 	}
2253 }
2254 
2255 
2256 /*
2257  * Need to modulate the sequence numbers in the TCP SACK option
2258  * (credits to Krzysztof Pfaff for report and patch)
2259  */
2260 static int
2261 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd,
2262     struct tcphdr *th, struct pf_state_peer *dst)
2263 {
2264 	int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen;
2265 	u_int8_t opts[TCP_MAXOLEN], *opt = opts;
2266 	int copyback = 0, i, olen;
2267 	struct sackblk sack;
2268 
2269 #define	TCPOLEN_SACKLEN	(TCPOLEN_SACK + 2)
2270 	if (hlen < TCPOLEN_SACKLEN ||
2271 	    !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af))
2272 		return 0;
2273 
2274 	while (hlen >= TCPOLEN_SACKLEN) {
2275 		olen = opt[1];
2276 		switch (*opt) {
2277 		case TCPOPT_EOL:	/* FALLTHROUGH */
2278 		case TCPOPT_NOP:
2279 			opt++;
2280 			hlen--;
2281 			break;
2282 		case TCPOPT_SACK:
2283 			if (olen > hlen)
2284 				olen = hlen;
2285 			if (olen >= TCPOLEN_SACKLEN) {
2286 				for (i = 2; i + TCPOLEN_SACK <= olen;
2287 				    i += TCPOLEN_SACK) {
2288 					memcpy(&sack, &opt[i], sizeof(sack));
2289 					pf_change_proto_a(m, &sack.start, &th->th_sum,
2290 					    htonl(ntohl(sack.start) - dst->seqdiff), 0);
2291 					pf_change_proto_a(m, &sack.end, &th->th_sum,
2292 					    htonl(ntohl(sack.end) - dst->seqdiff), 0);
2293 					memcpy(&opt[i], &sack, sizeof(sack));
2294 				}
2295 				copyback = 1;
2296 			}
2297 			/* FALLTHROUGH */
2298 		default:
2299 			if (olen < 2)
2300 				olen = 2;
2301 			hlen -= olen;
2302 			opt += olen;
2303 		}
2304 	}
2305 
2306 	if (copyback)
2307 		m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts);
2308 	return (copyback);
2309 }
2310 
2311 static void
2312 pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af,
2313     const struct pf_addr *saddr, const struct pf_addr *daddr,
2314     u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
2315     u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag,
2316     u_int16_t rtag, struct ifnet *ifp)
2317 {
2318 	struct pf_send_entry *pfse;
2319 	struct mbuf	*m;
2320 	int		 len, tlen;
2321 #ifdef INET
2322 	struct ip	*h = NULL;
2323 #endif /* INET */
2324 #ifdef INET6
2325 	struct ip6_hdr	*h6 = NULL;
2326 #endif /* INET6 */
2327 	struct tcphdr	*th;
2328 	char		*opt;
2329 	struct pf_mtag  *pf_mtag;
2330 
2331 	len = 0;
2332 	th = NULL;
2333 
2334 	/* maximum segment size tcp option */
2335 	tlen = sizeof(struct tcphdr);
2336 	if (mss)
2337 		tlen += 4;
2338 
2339 	switch (af) {
2340 #ifdef INET
2341 	case AF_INET:
2342 		len = sizeof(struct ip) + tlen;
2343 		break;
2344 #endif /* INET */
2345 #ifdef INET6
2346 	case AF_INET6:
2347 		len = sizeof(struct ip6_hdr) + tlen;
2348 		break;
2349 #endif /* INET6 */
2350 	default:
2351 		panic("%s: unsupported af %d", __func__, af);
2352 	}
2353 
2354 	/* Allocate outgoing queue entry, mbuf and mbuf tag. */
2355 	pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT);
2356 	if (pfse == NULL)
2357 		return;
2358 	m = m_gethdr(M_NOWAIT, MT_DATA);
2359 	if (m == NULL) {
2360 		free(pfse, M_PFTEMP);
2361 		return;
2362 	}
2363 #ifdef MAC
2364 	mac_netinet_firewall_send(m);
2365 #endif
2366 	if ((pf_mtag = pf_get_mtag(m)) == NULL) {
2367 		free(pfse, M_PFTEMP);
2368 		m_freem(m);
2369 		return;
2370 	}
2371 	if (tag)
2372 		m->m_flags |= M_SKIP_FIREWALL;
2373 	pf_mtag->tag = rtag;
2374 
2375 	if (r != NULL && r->rtableid >= 0)
2376 		M_SETFIB(m, r->rtableid);
2377 
2378 #ifdef ALTQ
2379 	if (r != NULL && r->qid) {
2380 		pf_mtag->qid = r->qid;
2381 
2382 		/* add hints for ecn */
2383 		pf_mtag->hdr = mtod(m, struct ip *);
2384 	}
2385 #endif /* ALTQ */
2386 	m->m_data += max_linkhdr;
2387 	m->m_pkthdr.len = m->m_len = len;
2388 	m->m_pkthdr.rcvif = NULL;
2389 	bzero(m->m_data, len);
2390 	switch (af) {
2391 #ifdef INET
2392 	case AF_INET:
2393 		h = mtod(m, struct ip *);
2394 
2395 		/* IP header fields included in the TCP checksum */
2396 		h->ip_p = IPPROTO_TCP;
2397 		h->ip_len = htons(tlen);
2398 		h->ip_src.s_addr = saddr->v4.s_addr;
2399 		h->ip_dst.s_addr = daddr->v4.s_addr;
2400 
2401 		th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
2402 		break;
2403 #endif /* INET */
2404 #ifdef INET6
2405 	case AF_INET6:
2406 		h6 = mtod(m, struct ip6_hdr *);
2407 
2408 		/* IP header fields included in the TCP checksum */
2409 		h6->ip6_nxt = IPPROTO_TCP;
2410 		h6->ip6_plen = htons(tlen);
2411 		memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
2412 		memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
2413 
2414 		th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
2415 		break;
2416 #endif /* INET6 */
2417 	}
2418 
2419 	/* TCP header */
2420 	th->th_sport = sport;
2421 	th->th_dport = dport;
2422 	th->th_seq = htonl(seq);
2423 	th->th_ack = htonl(ack);
2424 	th->th_off = tlen >> 2;
2425 	th->th_flags = flags;
2426 	th->th_win = htons(win);
2427 
2428 	if (mss) {
2429 		opt = (char *)(th + 1);
2430 		opt[0] = TCPOPT_MAXSEG;
2431 		opt[1] = 4;
2432 		HTONS(mss);
2433 		bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
2434 	}
2435 
2436 	switch (af) {
2437 #ifdef INET
2438 	case AF_INET:
2439 		/* TCP checksum */
2440 		th->th_sum = in_cksum(m, len);
2441 
2442 		/* Finish the IP header */
2443 		h->ip_v = 4;
2444 		h->ip_hl = sizeof(*h) >> 2;
2445 		h->ip_tos = IPTOS_LOWDELAY;
2446 		h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0);
2447 		h->ip_len = htons(len);
2448 		h->ip_ttl = ttl ? ttl : V_ip_defttl;
2449 		h->ip_sum = 0;
2450 
2451 		pfse->pfse_type = PFSE_IP;
2452 		break;
2453 #endif /* INET */
2454 #ifdef INET6
2455 	case AF_INET6:
2456 		/* TCP checksum */
2457 		th->th_sum = in6_cksum(m, IPPROTO_TCP,
2458 		    sizeof(struct ip6_hdr), tlen);
2459 
2460 		h6->ip6_vfc |= IPV6_VERSION;
2461 		h6->ip6_hlim = IPV6_DEFHLIM;
2462 
2463 		pfse->pfse_type = PFSE_IP6;
2464 		break;
2465 #endif /* INET6 */
2466 	}
2467 	pfse->pfse_m = m;
2468 	pf_send(pfse);
2469 }
2470 
2471 static int
2472 pf_ieee8021q_setpcp(struct mbuf *m, u_int8_t prio)
2473 {
2474 	struct m_tag *mtag;
2475 
2476 	KASSERT(prio <= PF_PRIO_MAX,
2477 	    ("%s with invalid pcp", __func__));
2478 
2479 	mtag = m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_OUT, NULL);
2480 	if (mtag == NULL) {
2481 		mtag = m_tag_alloc(MTAG_8021Q, MTAG_8021Q_PCP_OUT,
2482 		    sizeof(uint8_t), M_NOWAIT);
2483 		if (mtag == NULL)
2484 			return (ENOMEM);
2485 		m_tag_prepend(m, mtag);
2486 	}
2487 
2488 	*(uint8_t *)(mtag + 1) = prio;
2489 	return (0);
2490 }
2491 
2492 static int
2493 pf_match_ieee8021q_pcp(u_int8_t prio, struct mbuf *m)
2494 {
2495 	struct m_tag *mtag;
2496 	u_int8_t mpcp;
2497 
2498 	mtag = m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_IN, NULL);
2499 	if (mtag == NULL)
2500 		return (0);
2501 
2502 	if (prio == PF_PRIO_ZERO)
2503 		prio = 0;
2504 
2505 	mpcp = *(uint8_t *)(mtag + 1);
2506 
2507 	return (mpcp == prio);
2508 }
2509 
2510 static void
2511 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
2512     struct pf_rule *r)
2513 {
2514 	struct pf_send_entry *pfse;
2515 	struct mbuf *m0;
2516 	struct pf_mtag *pf_mtag;
2517 
2518 	/* Allocate outgoing queue entry, mbuf and mbuf tag. */
2519 	pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT);
2520 	if (pfse == NULL)
2521 		return;
2522 
2523 	if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) {
2524 		free(pfse, M_PFTEMP);
2525 		return;
2526 	}
2527 
2528 	if ((pf_mtag = pf_get_mtag(m0)) == NULL) {
2529 		free(pfse, M_PFTEMP);
2530 		return;
2531 	}
2532 	/* XXX: revisit */
2533 	m0->m_flags |= M_SKIP_FIREWALL;
2534 
2535 	if (r->rtableid >= 0)
2536 		M_SETFIB(m0, r->rtableid);
2537 
2538 #ifdef ALTQ
2539 	if (r->qid) {
2540 		pf_mtag->qid = r->qid;
2541 		/* add hints for ecn */
2542 		pf_mtag->hdr = mtod(m0, struct ip *);
2543 	}
2544 #endif /* ALTQ */
2545 
2546 	switch (af) {
2547 #ifdef INET
2548 	case AF_INET:
2549 		pfse->pfse_type = PFSE_ICMP;
2550 		break;
2551 #endif /* INET */
2552 #ifdef INET6
2553 	case AF_INET6:
2554 		pfse->pfse_type = PFSE_ICMP6;
2555 		break;
2556 #endif /* INET6 */
2557 	}
2558 	pfse->pfse_m = m0;
2559 	pfse->icmpopts.type = type;
2560 	pfse->icmpopts.code = code;
2561 	pf_send(pfse);
2562 }
2563 
2564 /*
2565  * Return 1 if the addresses a and b match (with mask m), otherwise return 0.
2566  * If n is 0, they match if they are equal. If n is != 0, they match if they
2567  * are different.
2568  */
2569 int
2570 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
2571     struct pf_addr *b, sa_family_t af)
2572 {
2573 	int	match = 0;
2574 
2575 	switch (af) {
2576 #ifdef INET
2577 	case AF_INET:
2578 		if ((a->addr32[0] & m->addr32[0]) ==
2579 		    (b->addr32[0] & m->addr32[0]))
2580 			match++;
2581 		break;
2582 #endif /* INET */
2583 #ifdef INET6
2584 	case AF_INET6:
2585 		if (((a->addr32[0] & m->addr32[0]) ==
2586 		     (b->addr32[0] & m->addr32[0])) &&
2587 		    ((a->addr32[1] & m->addr32[1]) ==
2588 		     (b->addr32[1] & m->addr32[1])) &&
2589 		    ((a->addr32[2] & m->addr32[2]) ==
2590 		     (b->addr32[2] & m->addr32[2])) &&
2591 		    ((a->addr32[3] & m->addr32[3]) ==
2592 		     (b->addr32[3] & m->addr32[3])))
2593 			match++;
2594 		break;
2595 #endif /* INET6 */
2596 	}
2597 	if (match) {
2598 		if (n)
2599 			return (0);
2600 		else
2601 			return (1);
2602 	} else {
2603 		if (n)
2604 			return (1);
2605 		else
2606 			return (0);
2607 	}
2608 }
2609 
2610 /*
2611  * Return 1 if b <= a <= e, otherwise return 0.
2612  */
2613 int
2614 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e,
2615     struct pf_addr *a, sa_family_t af)
2616 {
2617 	switch (af) {
2618 #ifdef INET
2619 	case AF_INET:
2620 		if ((ntohl(a->addr32[0]) < ntohl(b->addr32[0])) ||
2621 		    (ntohl(a->addr32[0]) > ntohl(e->addr32[0])))
2622 			return (0);
2623 		break;
2624 #endif /* INET */
2625 #ifdef INET6
2626 	case AF_INET6: {
2627 		int	i;
2628 
2629 		/* check a >= b */
2630 		for (i = 0; i < 4; ++i)
2631 			if (ntohl(a->addr32[i]) > ntohl(b->addr32[i]))
2632 				break;
2633 			else if (ntohl(a->addr32[i]) < ntohl(b->addr32[i]))
2634 				return (0);
2635 		/* check a <= e */
2636 		for (i = 0; i < 4; ++i)
2637 			if (ntohl(a->addr32[i]) < ntohl(e->addr32[i]))
2638 				break;
2639 			else if (ntohl(a->addr32[i]) > ntohl(e->addr32[i]))
2640 				return (0);
2641 		break;
2642 	}
2643 #endif /* INET6 */
2644 	}
2645 	return (1);
2646 }
2647 
2648 static int
2649 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
2650 {
2651 	switch (op) {
2652 	case PF_OP_IRG:
2653 		return ((p > a1) && (p < a2));
2654 	case PF_OP_XRG:
2655 		return ((p < a1) || (p > a2));
2656 	case PF_OP_RRG:
2657 		return ((p >= a1) && (p <= a2));
2658 	case PF_OP_EQ:
2659 		return (p == a1);
2660 	case PF_OP_NE:
2661 		return (p != a1);
2662 	case PF_OP_LT:
2663 		return (p < a1);
2664 	case PF_OP_LE:
2665 		return (p <= a1);
2666 	case PF_OP_GT:
2667 		return (p > a1);
2668 	case PF_OP_GE:
2669 		return (p >= a1);
2670 	}
2671 	return (0); /* never reached */
2672 }
2673 
2674 int
2675 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
2676 {
2677 	NTOHS(a1);
2678 	NTOHS(a2);
2679 	NTOHS(p);
2680 	return (pf_match(op, a1, a2, p));
2681 }
2682 
2683 static int
2684 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
2685 {
2686 	if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2687 		return (0);
2688 	return (pf_match(op, a1, a2, u));
2689 }
2690 
2691 static int
2692 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
2693 {
2694 	if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2695 		return (0);
2696 	return (pf_match(op, a1, a2, g));
2697 }
2698 
2699 int
2700 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag, int mtag)
2701 {
2702 	if (*tag == -1)
2703 		*tag = mtag;
2704 
2705 	return ((!r->match_tag_not && r->match_tag == *tag) ||
2706 	    (r->match_tag_not && r->match_tag != *tag));
2707 }
2708 
2709 int
2710 pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag)
2711 {
2712 
2713 	KASSERT(tag > 0, ("%s: tag %d", __func__, tag));
2714 
2715 	if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL))
2716 		return (ENOMEM);
2717 
2718 	pd->pf_mtag->tag = tag;
2719 
2720 	return (0);
2721 }
2722 
2723 #define	PF_ANCHOR_STACKSIZE	32
2724 struct pf_anchor_stackframe {
2725 	struct pf_ruleset	*rs;
2726 	struct pf_rule		*r;	/* XXX: + match bit */
2727 	struct pf_anchor	*child;
2728 };
2729 
2730 /*
2731  * XXX: We rely on malloc(9) returning pointer aligned addresses.
2732  */
2733 #define	PF_ANCHORSTACK_MATCH	0x00000001
2734 #define	PF_ANCHORSTACK_MASK	(PF_ANCHORSTACK_MATCH)
2735 
2736 #define	PF_ANCHOR_MATCH(f)	((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH)
2737 #define	PF_ANCHOR_RULE(f)	(struct pf_rule *)			\
2738 				((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK)
2739 #define	PF_ANCHOR_SET_MATCH(f)	do { (f)->r = (void *) 			\
2740 				((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH);  \
2741 } while (0)
2742 
2743 void
2744 pf_step_into_anchor(struct pf_anchor_stackframe *stack, int *depth,
2745     struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a,
2746     int *match)
2747 {
2748 	struct pf_anchor_stackframe	*f;
2749 
2750 	PF_RULES_RASSERT();
2751 
2752 	if (match)
2753 		*match = 0;
2754 	if (*depth >= PF_ANCHOR_STACKSIZE) {
2755 		printf("%s: anchor stack overflow on %s\n",
2756 		    __func__, (*r)->anchor->name);
2757 		*r = TAILQ_NEXT(*r, entries);
2758 		return;
2759 	} else if (*depth == 0 && a != NULL)
2760 		*a = *r;
2761 	f = stack + (*depth)++;
2762 	f->rs = *rs;
2763 	f->r = *r;
2764 	if ((*r)->anchor_wildcard) {
2765 		struct pf_anchor_node *parent = &(*r)->anchor->children;
2766 
2767 		if ((f->child = RB_MIN(pf_anchor_node, parent)) == NULL) {
2768 			*r = NULL;
2769 			return;
2770 		}
2771 		*rs = &f->child->ruleset;
2772 	} else {
2773 		f->child = NULL;
2774 		*rs = &(*r)->anchor->ruleset;
2775 	}
2776 	*r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2777 }
2778 
2779 int
2780 pf_step_out_of_anchor(struct pf_anchor_stackframe *stack, int *depth,
2781     struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a,
2782     int *match)
2783 {
2784 	struct pf_anchor_stackframe	*f;
2785 	struct pf_rule *fr;
2786 	int quick = 0;
2787 
2788 	PF_RULES_RASSERT();
2789 
2790 	do {
2791 		if (*depth <= 0)
2792 			break;
2793 		f = stack + *depth - 1;
2794 		fr = PF_ANCHOR_RULE(f);
2795 		if (f->child != NULL) {
2796 			struct pf_anchor_node *parent;
2797 
2798 			/*
2799 			 * This block traverses through
2800 			 * a wildcard anchor.
2801 			 */
2802 			parent = &fr->anchor->children;
2803 			if (match != NULL && *match) {
2804 				/*
2805 				 * If any of "*" matched, then
2806 				 * "foo/ *" matched, mark frame
2807 				 * appropriately.
2808 				 */
2809 				PF_ANCHOR_SET_MATCH(f);
2810 				*match = 0;
2811 			}
2812 			f->child = RB_NEXT(pf_anchor_node, parent, f->child);
2813 			if (f->child != NULL) {
2814 				*rs = &f->child->ruleset;
2815 				*r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2816 				if (*r == NULL)
2817 					continue;
2818 				else
2819 					break;
2820 			}
2821 		}
2822 		(*depth)--;
2823 		if (*depth == 0 && a != NULL)
2824 			*a = NULL;
2825 		*rs = f->rs;
2826 		if (PF_ANCHOR_MATCH(f) || (match != NULL && *match))
2827 			quick = fr->quick;
2828 		*r = TAILQ_NEXT(fr, entries);
2829 	} while (*r == NULL);
2830 
2831 	return (quick);
2832 }
2833 
2834 #ifdef INET6
2835 void
2836 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
2837     struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
2838 {
2839 	switch (af) {
2840 #ifdef INET
2841 	case AF_INET:
2842 		naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2843 		((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2844 		break;
2845 #endif /* INET */
2846 	case AF_INET6:
2847 		naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2848 		((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2849 		naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
2850 		((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
2851 		naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
2852 		((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
2853 		naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
2854 		((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
2855 		break;
2856 	}
2857 }
2858 
2859 void
2860 pf_addr_inc(struct pf_addr *addr, sa_family_t af)
2861 {
2862 	switch (af) {
2863 #ifdef INET
2864 	case AF_INET:
2865 		addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
2866 		break;
2867 #endif /* INET */
2868 	case AF_INET6:
2869 		if (addr->addr32[3] == 0xffffffff) {
2870 			addr->addr32[3] = 0;
2871 			if (addr->addr32[2] == 0xffffffff) {
2872 				addr->addr32[2] = 0;
2873 				if (addr->addr32[1] == 0xffffffff) {
2874 					addr->addr32[1] = 0;
2875 					addr->addr32[0] =
2876 					    htonl(ntohl(addr->addr32[0]) + 1);
2877 				} else
2878 					addr->addr32[1] =
2879 					    htonl(ntohl(addr->addr32[1]) + 1);
2880 			} else
2881 				addr->addr32[2] =
2882 				    htonl(ntohl(addr->addr32[2]) + 1);
2883 		} else
2884 			addr->addr32[3] =
2885 			    htonl(ntohl(addr->addr32[3]) + 1);
2886 		break;
2887 	}
2888 }
2889 #endif /* INET6 */
2890 
2891 int
2892 pf_socket_lookup(int direction, struct pf_pdesc *pd, struct mbuf *m)
2893 {
2894 	struct pf_addr		*saddr, *daddr;
2895 	u_int16_t		 sport, dport;
2896 	struct inpcbinfo	*pi;
2897 	struct inpcb		*inp;
2898 
2899 	pd->lookup.uid = UID_MAX;
2900 	pd->lookup.gid = GID_MAX;
2901 
2902 	switch (pd->proto) {
2903 	case IPPROTO_TCP:
2904 		if (pd->hdr.tcp == NULL)
2905 			return (-1);
2906 		sport = pd->hdr.tcp->th_sport;
2907 		dport = pd->hdr.tcp->th_dport;
2908 		pi = &V_tcbinfo;
2909 		break;
2910 	case IPPROTO_UDP:
2911 		if (pd->hdr.udp == NULL)
2912 			return (-1);
2913 		sport = pd->hdr.udp->uh_sport;
2914 		dport = pd->hdr.udp->uh_dport;
2915 		pi = &V_udbinfo;
2916 		break;
2917 	default:
2918 		return (-1);
2919 	}
2920 	if (direction == PF_IN) {
2921 		saddr = pd->src;
2922 		daddr = pd->dst;
2923 	} else {
2924 		u_int16_t	p;
2925 
2926 		p = sport;
2927 		sport = dport;
2928 		dport = p;
2929 		saddr = pd->dst;
2930 		daddr = pd->src;
2931 	}
2932 	switch (pd->af) {
2933 #ifdef INET
2934 	case AF_INET:
2935 		inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4,
2936 		    dport, INPLOOKUP_RLOCKPCB, NULL, m);
2937 		if (inp == NULL) {
2938 			inp = in_pcblookup_mbuf(pi, saddr->v4, sport,
2939 			   daddr->v4, dport, INPLOOKUP_WILDCARD |
2940 			   INPLOOKUP_RLOCKPCB, NULL, m);
2941 			if (inp == NULL)
2942 				return (-1);
2943 		}
2944 		break;
2945 #endif /* INET */
2946 #ifdef INET6
2947 	case AF_INET6:
2948 		inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6,
2949 		    dport, INPLOOKUP_RLOCKPCB, NULL, m);
2950 		if (inp == NULL) {
2951 			inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport,
2952 			    &daddr->v6, dport, INPLOOKUP_WILDCARD |
2953 			    INPLOOKUP_RLOCKPCB, NULL, m);
2954 			if (inp == NULL)
2955 				return (-1);
2956 		}
2957 		break;
2958 #endif /* INET6 */
2959 
2960 	default:
2961 		return (-1);
2962 	}
2963 	INP_RLOCK_ASSERT(inp);
2964 	pd->lookup.uid = inp->inp_cred->cr_uid;
2965 	pd->lookup.gid = inp->inp_cred->cr_groups[0];
2966 	INP_RUNLOCK(inp);
2967 
2968 	return (1);
2969 }
2970 
2971 static u_int8_t
2972 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
2973 {
2974 	int		 hlen;
2975 	u_int8_t	 hdr[60];
2976 	u_int8_t	*opt, optlen;
2977 	u_int8_t	 wscale = 0;
2978 
2979 	hlen = th_off << 2;		/* hlen <= sizeof(hdr) */
2980 	if (hlen <= sizeof(struct tcphdr))
2981 		return (0);
2982 	if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
2983 		return (0);
2984 	opt = hdr + sizeof(struct tcphdr);
2985 	hlen -= sizeof(struct tcphdr);
2986 	while (hlen >= 3) {
2987 		switch (*opt) {
2988 		case TCPOPT_EOL:
2989 		case TCPOPT_NOP:
2990 			++opt;
2991 			--hlen;
2992 			break;
2993 		case TCPOPT_WINDOW:
2994 			wscale = opt[2];
2995 			if (wscale > TCP_MAX_WINSHIFT)
2996 				wscale = TCP_MAX_WINSHIFT;
2997 			wscale |= PF_WSCALE_FLAG;
2998 			/* FALLTHROUGH */
2999 		default:
3000 			optlen = opt[1];
3001 			if (optlen < 2)
3002 				optlen = 2;
3003 			hlen -= optlen;
3004 			opt += optlen;
3005 			break;
3006 		}
3007 	}
3008 	return (wscale);
3009 }
3010 
3011 static u_int16_t
3012 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
3013 {
3014 	int		 hlen;
3015 	u_int8_t	 hdr[60];
3016 	u_int8_t	*opt, optlen;
3017 	u_int16_t	 mss = V_tcp_mssdflt;
3018 
3019 	hlen = th_off << 2;	/* hlen <= sizeof(hdr) */
3020 	if (hlen <= sizeof(struct tcphdr))
3021 		return (0);
3022 	if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
3023 		return (0);
3024 	opt = hdr + sizeof(struct tcphdr);
3025 	hlen -= sizeof(struct tcphdr);
3026 	while (hlen >= TCPOLEN_MAXSEG) {
3027 		switch (*opt) {
3028 		case TCPOPT_EOL:
3029 		case TCPOPT_NOP:
3030 			++opt;
3031 			--hlen;
3032 			break;
3033 		case TCPOPT_MAXSEG:
3034 			bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
3035 			NTOHS(mss);
3036 			/* FALLTHROUGH */
3037 		default:
3038 			optlen = opt[1];
3039 			if (optlen < 2)
3040 				optlen = 2;
3041 			hlen -= optlen;
3042 			opt += optlen;
3043 			break;
3044 		}
3045 	}
3046 	return (mss);
3047 }
3048 
3049 static u_int16_t
3050 pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer)
3051 {
3052 #ifdef INET
3053 	struct nhop4_basic	nh4;
3054 #endif /* INET */
3055 #ifdef INET6
3056 	struct nhop6_basic	nh6;
3057 	struct in6_addr		dst6;
3058 	uint32_t		scopeid;
3059 #endif /* INET6 */
3060 	int			 hlen = 0;
3061 	uint16_t		 mss = 0;
3062 
3063 	switch (af) {
3064 #ifdef INET
3065 	case AF_INET:
3066 		hlen = sizeof(struct ip);
3067 		if (fib4_lookup_nh_basic(rtableid, addr->v4, 0, 0, &nh4) == 0)
3068 			mss = nh4.nh_mtu - hlen - sizeof(struct tcphdr);
3069 		break;
3070 #endif /* INET */
3071 #ifdef INET6
3072 	case AF_INET6:
3073 		hlen = sizeof(struct ip6_hdr);
3074 		in6_splitscope(&addr->v6, &dst6, &scopeid);
3075 		if (fib6_lookup_nh_basic(rtableid, &dst6, scopeid, 0,0,&nh6)==0)
3076 			mss = nh6.nh_mtu - hlen - sizeof(struct tcphdr);
3077 		break;
3078 #endif /* INET6 */
3079 	}
3080 
3081 	mss = max(V_tcp_mssdflt, mss);
3082 	mss = min(mss, offer);
3083 	mss = max(mss, 64);		/* sanity - at least max opt space */
3084 	return (mss);
3085 }
3086 
3087 static u_int32_t
3088 pf_tcp_iss(struct pf_pdesc *pd)
3089 {
3090 	MD5_CTX ctx;
3091 	u_int32_t digest[4];
3092 
3093 	if (V_pf_tcp_secret_init == 0) {
3094 		read_random(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret));
3095 		MD5Init(&V_pf_tcp_secret_ctx);
3096 		MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret,
3097 		    sizeof(V_pf_tcp_secret));
3098 		V_pf_tcp_secret_init = 1;
3099 	}
3100 
3101 	ctx = V_pf_tcp_secret_ctx;
3102 
3103 	MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short));
3104 	MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short));
3105 	if (pd->af == AF_INET6) {
3106 		MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr));
3107 		MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr));
3108 	} else {
3109 		MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr));
3110 		MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr));
3111 	}
3112 	MD5Final((u_char *)digest, &ctx);
3113 	V_pf_tcp_iss_off += 4096;
3114 #define	ISN_RANDOM_INCREMENT (4096 - 1)
3115 	return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) +
3116 	    V_pf_tcp_iss_off);
3117 #undef	ISN_RANDOM_INCREMENT
3118 }
3119 
3120 static int
3121 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction,
3122     struct pfi_kif *kif, struct mbuf *m, int off, struct pf_pdesc *pd,
3123     struct pf_rule **am, struct pf_ruleset **rsm, struct inpcb *inp)
3124 {
3125 	struct pf_rule		*nr = NULL;
3126 	struct pf_addr		* const saddr = pd->src;
3127 	struct pf_addr		* const daddr = pd->dst;
3128 	sa_family_t		 af = pd->af;
3129 	struct pf_rule		*r, *a = NULL;
3130 	struct pf_ruleset	*ruleset = NULL;
3131 	struct pf_src_node	*nsn = NULL;
3132 	struct tcphdr		*th = pd->hdr.tcp;
3133 	struct pf_state_key	*sk = NULL, *nk = NULL;
3134 	u_short			 reason;
3135 	int			 rewrite = 0, hdrlen = 0;
3136 	int			 tag = -1, rtableid = -1;
3137 	int			 asd = 0;
3138 	int			 match = 0;
3139 	int			 state_icmp = 0;
3140 	u_int16_t		 sport = 0, dport = 0;
3141 	u_int16_t		 bproto_sum = 0, bip_sum = 0;
3142 	u_int8_t		 icmptype = 0, icmpcode = 0;
3143 	struct pf_anchor_stackframe	anchor_stack[PF_ANCHOR_STACKSIZE];
3144 
3145 	PF_RULES_RASSERT();
3146 
3147 	if (inp != NULL) {
3148 		INP_LOCK_ASSERT(inp);
3149 		pd->lookup.uid = inp->inp_cred->cr_uid;
3150 		pd->lookup.gid = inp->inp_cred->cr_groups[0];
3151 		pd->lookup.done = 1;
3152 	}
3153 
3154 	switch (pd->proto) {
3155 	case IPPROTO_TCP:
3156 		sport = th->th_sport;
3157 		dport = th->th_dport;
3158 		hdrlen = sizeof(*th);
3159 		break;
3160 	case IPPROTO_UDP:
3161 		sport = pd->hdr.udp->uh_sport;
3162 		dport = pd->hdr.udp->uh_dport;
3163 		hdrlen = sizeof(*pd->hdr.udp);
3164 		break;
3165 #ifdef INET
3166 	case IPPROTO_ICMP:
3167 		if (pd->af != AF_INET)
3168 			break;
3169 		sport = dport = pd->hdr.icmp->icmp_id;
3170 		hdrlen = sizeof(*pd->hdr.icmp);
3171 		icmptype = pd->hdr.icmp->icmp_type;
3172 		icmpcode = pd->hdr.icmp->icmp_code;
3173 
3174 		if (icmptype == ICMP_UNREACH ||
3175 		    icmptype == ICMP_SOURCEQUENCH ||
3176 		    icmptype == ICMP_REDIRECT ||
3177 		    icmptype == ICMP_TIMXCEED ||
3178 		    icmptype == ICMP_PARAMPROB)
3179 			state_icmp++;
3180 		break;
3181 #endif /* INET */
3182 #ifdef INET6
3183 	case IPPROTO_ICMPV6:
3184 		if (af != AF_INET6)
3185 			break;
3186 		sport = dport = pd->hdr.icmp6->icmp6_id;
3187 		hdrlen = sizeof(*pd->hdr.icmp6);
3188 		icmptype = pd->hdr.icmp6->icmp6_type;
3189 		icmpcode = pd->hdr.icmp6->icmp6_code;
3190 
3191 		if (icmptype == ICMP6_DST_UNREACH ||
3192 		    icmptype == ICMP6_PACKET_TOO_BIG ||
3193 		    icmptype == ICMP6_TIME_EXCEEDED ||
3194 		    icmptype == ICMP6_PARAM_PROB)
3195 			state_icmp++;
3196 		break;
3197 #endif /* INET6 */
3198 	default:
3199 		sport = dport = hdrlen = 0;
3200 		break;
3201 	}
3202 
3203 	r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3204 
3205 	/* check packet for BINAT/NAT/RDR */
3206 	if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, &sk,
3207 	    &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) {
3208 		KASSERT(sk != NULL, ("%s: null sk", __func__));
3209 		KASSERT(nk != NULL, ("%s: null nk", __func__));
3210 
3211 		if (pd->ip_sum)
3212 			bip_sum = *pd->ip_sum;
3213 
3214 		switch (pd->proto) {
3215 		case IPPROTO_TCP:
3216 			bproto_sum = th->th_sum;
3217 			pd->proto_sum = &th->th_sum;
3218 
3219 			if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3220 			    nk->port[pd->sidx] != sport) {
3221 				pf_change_ap(m, saddr, &th->th_sport, pd->ip_sum,
3222 				    &th->th_sum, &nk->addr[pd->sidx],
3223 				    nk->port[pd->sidx], 0, af);
3224 				pd->sport = &th->th_sport;
3225 				sport = th->th_sport;
3226 			}
3227 
3228 			if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3229 			    nk->port[pd->didx] != dport) {
3230 				pf_change_ap(m, daddr, &th->th_dport, pd->ip_sum,
3231 				    &th->th_sum, &nk->addr[pd->didx],
3232 				    nk->port[pd->didx], 0, af);
3233 				dport = th->th_dport;
3234 				pd->dport = &th->th_dport;
3235 			}
3236 			rewrite++;
3237 			break;
3238 		case IPPROTO_UDP:
3239 			bproto_sum = pd->hdr.udp->uh_sum;
3240 			pd->proto_sum = &pd->hdr.udp->uh_sum;
3241 
3242 			if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3243 			    nk->port[pd->sidx] != sport) {
3244 				pf_change_ap(m, saddr, &pd->hdr.udp->uh_sport,
3245 				    pd->ip_sum, &pd->hdr.udp->uh_sum,
3246 				    &nk->addr[pd->sidx],
3247 				    nk->port[pd->sidx], 1, af);
3248 				sport = pd->hdr.udp->uh_sport;
3249 				pd->sport = &pd->hdr.udp->uh_sport;
3250 			}
3251 
3252 			if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3253 			    nk->port[pd->didx] != dport) {
3254 				pf_change_ap(m, daddr, &pd->hdr.udp->uh_dport,
3255 				    pd->ip_sum, &pd->hdr.udp->uh_sum,
3256 				    &nk->addr[pd->didx],
3257 				    nk->port[pd->didx], 1, af);
3258 				dport = pd->hdr.udp->uh_dport;
3259 				pd->dport = &pd->hdr.udp->uh_dport;
3260 			}
3261 			rewrite++;
3262 			break;
3263 #ifdef INET
3264 		case IPPROTO_ICMP:
3265 			nk->port[0] = nk->port[1];
3266 			if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET))
3267 				pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3268 				    nk->addr[pd->sidx].v4.s_addr, 0);
3269 
3270 			if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET))
3271 				pf_change_a(&daddr->v4.s_addr, pd->ip_sum,
3272 				    nk->addr[pd->didx].v4.s_addr, 0);
3273 
3274 			if (nk->port[1] != pd->hdr.icmp->icmp_id) {
3275 				pd->hdr.icmp->icmp_cksum = pf_cksum_fixup(
3276 				    pd->hdr.icmp->icmp_cksum, sport,
3277 				    nk->port[1], 0);
3278 				pd->hdr.icmp->icmp_id = nk->port[1];
3279 				pd->sport = &pd->hdr.icmp->icmp_id;
3280 			}
3281 			m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
3282 			break;
3283 #endif /* INET */
3284 #ifdef INET6
3285 		case IPPROTO_ICMPV6:
3286 			nk->port[0] = nk->port[1];
3287 			if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6))
3288 				pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
3289 				    &nk->addr[pd->sidx], 0);
3290 
3291 			if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6))
3292 				pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
3293 				    &nk->addr[pd->didx], 0);
3294 			rewrite++;
3295 			break;
3296 #endif /* INET */
3297 		default:
3298 			switch (af) {
3299 #ifdef INET
3300 			case AF_INET:
3301 				if (PF_ANEQ(saddr,
3302 				    &nk->addr[pd->sidx], AF_INET))
3303 					pf_change_a(&saddr->v4.s_addr,
3304 					    pd->ip_sum,
3305 					    nk->addr[pd->sidx].v4.s_addr, 0);
3306 
3307 				if (PF_ANEQ(daddr,
3308 				    &nk->addr[pd->didx], AF_INET))
3309 					pf_change_a(&daddr->v4.s_addr,
3310 					    pd->ip_sum,
3311 					    nk->addr[pd->didx].v4.s_addr, 0);
3312 				break;
3313 #endif /* INET */
3314 #ifdef INET6
3315 			case AF_INET6:
3316 				if (PF_ANEQ(saddr,
3317 				    &nk->addr[pd->sidx], AF_INET6))
3318 					PF_ACPY(saddr, &nk->addr[pd->sidx], af);
3319 
3320 				if (PF_ANEQ(daddr,
3321 				    &nk->addr[pd->didx], AF_INET6))
3322 					PF_ACPY(saddr, &nk->addr[pd->didx], af);
3323 				break;
3324 #endif /* INET */
3325 			}
3326 			break;
3327 		}
3328 		if (nr->natpass)
3329 			r = NULL;
3330 		pd->nat_rule = nr;
3331 	}
3332 
3333 	while (r != NULL) {
3334 		r->evaluations++;
3335 		if (pfi_kif_match(r->kif, kif) == r->ifnot)
3336 			r = r->skip[PF_SKIP_IFP].ptr;
3337 		else if (r->direction && r->direction != direction)
3338 			r = r->skip[PF_SKIP_DIR].ptr;
3339 		else if (r->af && r->af != af)
3340 			r = r->skip[PF_SKIP_AF].ptr;
3341 		else if (r->proto && r->proto != pd->proto)
3342 			r = r->skip[PF_SKIP_PROTO].ptr;
3343 		else if (PF_MISMATCHAW(&r->src.addr, saddr, af,
3344 		    r->src.neg, kif, M_GETFIB(m)))
3345 			r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3346 		/* tcp/udp only. port_op always 0 in other cases */
3347 		else if (r->src.port_op && !pf_match_port(r->src.port_op,
3348 		    r->src.port[0], r->src.port[1], sport))
3349 			r = r->skip[PF_SKIP_SRC_PORT].ptr;
3350 		else if (PF_MISMATCHAW(&r->dst.addr, daddr, af,
3351 		    r->dst.neg, NULL, M_GETFIB(m)))
3352 			r = r->skip[PF_SKIP_DST_ADDR].ptr;
3353 		/* tcp/udp only. port_op always 0 in other cases */
3354 		else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
3355 		    r->dst.port[0], r->dst.port[1], dport))
3356 			r = r->skip[PF_SKIP_DST_PORT].ptr;
3357 		/* icmp only. type always 0 in other cases */
3358 		else if (r->type && r->type != icmptype + 1)
3359 			r = TAILQ_NEXT(r, entries);
3360 		/* icmp only. type always 0 in other cases */
3361 		else if (r->code && r->code != icmpcode + 1)
3362 			r = TAILQ_NEXT(r, entries);
3363 		else if (r->tos && !(r->tos == pd->tos))
3364 			r = TAILQ_NEXT(r, entries);
3365 		else if (r->rule_flag & PFRULE_FRAGMENT)
3366 			r = TAILQ_NEXT(r, entries);
3367 		else if (pd->proto == IPPROTO_TCP &&
3368 		    (r->flagset & th->th_flags) != r->flags)
3369 			r = TAILQ_NEXT(r, entries);
3370 		/* tcp/udp only. uid.op always 0 in other cases */
3371 		else if (r->uid.op && (pd->lookup.done || (pd->lookup.done =
3372 		    pf_socket_lookup(direction, pd, m), 1)) &&
3373 		    !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
3374 		    pd->lookup.uid))
3375 			r = TAILQ_NEXT(r, entries);
3376 		/* tcp/udp only. gid.op always 0 in other cases */
3377 		else if (r->gid.op && (pd->lookup.done || (pd->lookup.done =
3378 		    pf_socket_lookup(direction, pd, m), 1)) &&
3379 		    !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
3380 		    pd->lookup.gid))
3381 			r = TAILQ_NEXT(r, entries);
3382 		else if (r->prio &&
3383 		    !pf_match_ieee8021q_pcp(r->prio, m))
3384 			r = TAILQ_NEXT(r, entries);
3385 		else if (r->prob &&
3386 		    r->prob <= arc4random())
3387 			r = TAILQ_NEXT(r, entries);
3388 		else if (r->match_tag && !pf_match_tag(m, r, &tag,
3389 		    pd->pf_mtag ? pd->pf_mtag->tag : 0))
3390 			r = TAILQ_NEXT(r, entries);
3391 		else if (r->os_fingerprint != PF_OSFP_ANY &&
3392 		    (pd->proto != IPPROTO_TCP || !pf_osfp_match(
3393 		    pf_osfp_fingerprint(pd, m, off, th),
3394 		    r->os_fingerprint)))
3395 			r = TAILQ_NEXT(r, entries);
3396 		else {
3397 			if (r->tag)
3398 				tag = r->tag;
3399 			if (r->rtableid >= 0)
3400 				rtableid = r->rtableid;
3401 			if (r->anchor == NULL) {
3402 				match = 1;
3403 				*rm = r;
3404 				*am = a;
3405 				*rsm = ruleset;
3406 				if ((*rm)->quick)
3407 					break;
3408 				r = TAILQ_NEXT(r, entries);
3409 			} else
3410 				pf_step_into_anchor(anchor_stack, &asd,
3411 				    &ruleset, PF_RULESET_FILTER, &r, &a,
3412 				    &match);
3413 		}
3414 		if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd,
3415 		    &ruleset, PF_RULESET_FILTER, &r, &a, &match))
3416 			break;
3417 	}
3418 	r = *rm;
3419 	a = *am;
3420 	ruleset = *rsm;
3421 
3422 	REASON_SET(&reason, PFRES_MATCH);
3423 
3424 	if (r->log || (nr != NULL && nr->log)) {
3425 		if (rewrite)
3426 			m_copyback(m, off, hdrlen, pd->hdr.any);
3427 		PFLOG_PACKET(kif, m, af, direction, reason, r->log ? r : nr, a,
3428 		    ruleset, pd, 1);
3429 	}
3430 
3431 	if ((r->action == PF_DROP) &&
3432 	    ((r->rule_flag & PFRULE_RETURNRST) ||
3433 	    (r->rule_flag & PFRULE_RETURNICMP) ||
3434 	    (r->rule_flag & PFRULE_RETURN))) {
3435 		/* undo NAT changes, if they have taken place */
3436 		if (nr != NULL) {
3437 			PF_ACPY(saddr, &sk->addr[pd->sidx], af);
3438 			PF_ACPY(daddr, &sk->addr[pd->didx], af);
3439 			if (pd->sport)
3440 				*pd->sport = sk->port[pd->sidx];
3441 			if (pd->dport)
3442 				*pd->dport = sk->port[pd->didx];
3443 			if (pd->proto_sum)
3444 				*pd->proto_sum = bproto_sum;
3445 			if (pd->ip_sum)
3446 				*pd->ip_sum = bip_sum;
3447 			m_copyback(m, off, hdrlen, pd->hdr.any);
3448 		}
3449 		if (pd->proto == IPPROTO_TCP &&
3450 		    ((r->rule_flag & PFRULE_RETURNRST) ||
3451 		    (r->rule_flag & PFRULE_RETURN)) &&
3452 		    !(th->th_flags & TH_RST)) {
3453 			u_int32_t	 ack = ntohl(th->th_seq) + pd->p_len;
3454 			int		 len = 0;
3455 #ifdef INET
3456 			struct ip	*h4;
3457 #endif
3458 #ifdef INET6
3459 			struct ip6_hdr	*h6;
3460 #endif
3461 
3462 			switch (af) {
3463 #ifdef INET
3464 			case AF_INET:
3465 				h4 = mtod(m, struct ip *);
3466 				len = ntohs(h4->ip_len) - off;
3467 				break;
3468 #endif
3469 #ifdef INET6
3470 			case AF_INET6:
3471 				h6 = mtod(m, struct ip6_hdr *);
3472 				len = ntohs(h6->ip6_plen) - (off - sizeof(*h6));
3473 				break;
3474 #endif
3475 			}
3476 
3477 			if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af))
3478 				REASON_SET(&reason, PFRES_PROTCKSUM);
3479 			else {
3480 				if (th->th_flags & TH_SYN)
3481 					ack++;
3482 				if (th->th_flags & TH_FIN)
3483 					ack++;
3484 				pf_send_tcp(m, r, af, pd->dst,
3485 				    pd->src, th->th_dport, th->th_sport,
3486 				    ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
3487 				    r->return_ttl, 1, 0, kif->pfik_ifp);
3488 			}
3489 		} else if (pd->proto != IPPROTO_ICMP && af == AF_INET &&
3490 		    r->return_icmp)
3491 			pf_send_icmp(m, r->return_icmp >> 8,
3492 			    r->return_icmp & 255, af, r);
3493 		else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 &&
3494 		    r->return_icmp6)
3495 			pf_send_icmp(m, r->return_icmp6 >> 8,
3496 			    r->return_icmp6 & 255, af, r);
3497 	}
3498 
3499 	if (r->action == PF_DROP)
3500 		goto cleanup;
3501 
3502 	if (tag > 0 && pf_tag_packet(m, pd, tag)) {
3503 		REASON_SET(&reason, PFRES_MEMORY);
3504 		goto cleanup;
3505 	}
3506 	if (rtableid >= 0)
3507 		M_SETFIB(m, rtableid);
3508 
3509 	if (!state_icmp && (r->keep_state || nr != NULL ||
3510 	    (pd->flags & PFDESC_TCP_NORM))) {
3511 		int action;
3512 		action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off,
3513 		    sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum,
3514 		    hdrlen);
3515 		if (action != PF_PASS)
3516 			return (action);
3517 	} else {
3518 		if (sk != NULL)
3519 			uma_zfree(V_pf_state_key_z, sk);
3520 		if (nk != NULL)
3521 			uma_zfree(V_pf_state_key_z, nk);
3522 	}
3523 
3524 	/* copy back packet headers if we performed NAT operations */
3525 	if (rewrite)
3526 		m_copyback(m, off, hdrlen, pd->hdr.any);
3527 
3528 	if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) &&
3529 	    direction == PF_OUT &&
3530 	    pfsync_defer_ptr != NULL && pfsync_defer_ptr(*sm, m))
3531 		/*
3532 		 * We want the state created, but we dont
3533 		 * want to send this in case a partner
3534 		 * firewall has to know about it to allow
3535 		 * replies through it.
3536 		 */
3537 		return (PF_DEFER);
3538 
3539 	return (PF_PASS);
3540 
3541 cleanup:
3542 	if (sk != NULL)
3543 		uma_zfree(V_pf_state_key_z, sk);
3544 	if (nk != NULL)
3545 		uma_zfree(V_pf_state_key_z, nk);
3546 	return (PF_DROP);
3547 }
3548 
3549 static int
3550 pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a,
3551     struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *nk,
3552     struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport,
3553     u_int16_t dport, int *rewrite, struct pfi_kif *kif, struct pf_state **sm,
3554     int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen)
3555 {
3556 	struct pf_state		*s = NULL;
3557 	struct pf_src_node	*sn = NULL;
3558 	struct tcphdr		*th = pd->hdr.tcp;
3559 	u_int16_t		 mss = V_tcp_mssdflt;
3560 	u_short			 reason;
3561 
3562 	/* check maximums */
3563 	if (r->max_states &&
3564 	    (counter_u64_fetch(r->states_cur) >= r->max_states)) {
3565 		counter_u64_add(V_pf_status.lcounters[LCNT_STATES], 1);
3566 		REASON_SET(&reason, PFRES_MAXSTATES);
3567 		goto csfailed;
3568 	}
3569 	/* src node for filter rule */
3570 	if ((r->rule_flag & PFRULE_SRCTRACK ||
3571 	    r->rpool.opts & PF_POOL_STICKYADDR) &&
3572 	    pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) {
3573 		REASON_SET(&reason, PFRES_SRCLIMIT);
3574 		goto csfailed;
3575 	}
3576 	/* src node for translation rule */
3577 	if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3578 	    pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) {
3579 		REASON_SET(&reason, PFRES_SRCLIMIT);
3580 		goto csfailed;
3581 	}
3582 	s = uma_zalloc(V_pf_state_z, M_NOWAIT | M_ZERO);
3583 	if (s == NULL) {
3584 		REASON_SET(&reason, PFRES_MEMORY);
3585 		goto csfailed;
3586 	}
3587 	s->rule.ptr = r;
3588 	s->nat_rule.ptr = nr;
3589 	s->anchor.ptr = a;
3590 	STATE_INC_COUNTERS(s);
3591 	if (r->allow_opts)
3592 		s->state_flags |= PFSTATE_ALLOWOPTS;
3593 	if (r->rule_flag & PFRULE_STATESLOPPY)
3594 		s->state_flags |= PFSTATE_SLOPPY;
3595 	s->log = r->log & PF_LOG_ALL;
3596 	s->sync_state = PFSYNC_S_NONE;
3597 	if (nr != NULL)
3598 		s->log |= nr->log & PF_LOG_ALL;
3599 	switch (pd->proto) {
3600 	case IPPROTO_TCP:
3601 		s->src.seqlo = ntohl(th->th_seq);
3602 		s->src.seqhi = s->src.seqlo + pd->p_len + 1;
3603 		if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
3604 		    r->keep_state == PF_STATE_MODULATE) {
3605 			/* Generate sequence number modulator */
3606 			if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) ==
3607 			    0)
3608 				s->src.seqdiff = 1;
3609 			pf_change_proto_a(m, &th->th_seq, &th->th_sum,
3610 			    htonl(s->src.seqlo + s->src.seqdiff), 0);
3611 			*rewrite = 1;
3612 		} else
3613 			s->src.seqdiff = 0;
3614 		if (th->th_flags & TH_SYN) {
3615 			s->src.seqhi++;
3616 			s->src.wscale = pf_get_wscale(m, off,
3617 			    th->th_off, pd->af);
3618 		}
3619 		s->src.max_win = MAX(ntohs(th->th_win), 1);
3620 		if (s->src.wscale & PF_WSCALE_MASK) {
3621 			/* Remove scale factor from initial window */
3622 			int win = s->src.max_win;
3623 			win += 1 << (s->src.wscale & PF_WSCALE_MASK);
3624 			s->src.max_win = (win - 1) >>
3625 			    (s->src.wscale & PF_WSCALE_MASK);
3626 		}
3627 		if (th->th_flags & TH_FIN)
3628 			s->src.seqhi++;
3629 		s->dst.seqhi = 1;
3630 		s->dst.max_win = 1;
3631 		s->src.state = TCPS_SYN_SENT;
3632 		s->dst.state = TCPS_CLOSED;
3633 		s->timeout = PFTM_TCP_FIRST_PACKET;
3634 		break;
3635 	case IPPROTO_UDP:
3636 		s->src.state = PFUDPS_SINGLE;
3637 		s->dst.state = PFUDPS_NO_TRAFFIC;
3638 		s->timeout = PFTM_UDP_FIRST_PACKET;
3639 		break;
3640 	case IPPROTO_ICMP:
3641 #ifdef INET6
3642 	case IPPROTO_ICMPV6:
3643 #endif
3644 		s->timeout = PFTM_ICMP_FIRST_PACKET;
3645 		break;
3646 	default:
3647 		s->src.state = PFOTHERS_SINGLE;
3648 		s->dst.state = PFOTHERS_NO_TRAFFIC;
3649 		s->timeout = PFTM_OTHER_FIRST_PACKET;
3650 	}
3651 
3652 	if (r->rt) {
3653 		if (pf_map_addr(pd->af, r, pd->src, &s->rt_addr, NULL, &sn)) {
3654 			REASON_SET(&reason, PFRES_MAPFAILED);
3655 			pf_src_tree_remove_state(s);
3656 			STATE_DEC_COUNTERS(s);
3657 			uma_zfree(V_pf_state_z, s);
3658 			goto csfailed;
3659 		}
3660 		s->rt_kif = r->rpool.cur->kif;
3661 	}
3662 
3663 	s->creation = time_uptime;
3664 	s->expire = time_uptime;
3665 
3666 	if (sn != NULL)
3667 		s->src_node = sn;
3668 	if (nsn != NULL) {
3669 		/* XXX We only modify one side for now. */
3670 		PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af);
3671 		s->nat_src_node = nsn;
3672 	}
3673 	if (pd->proto == IPPROTO_TCP) {
3674 		if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
3675 		    off, pd, th, &s->src, &s->dst)) {
3676 			REASON_SET(&reason, PFRES_MEMORY);
3677 			pf_src_tree_remove_state(s);
3678 			STATE_DEC_COUNTERS(s);
3679 			uma_zfree(V_pf_state_z, s);
3680 			return (PF_DROP);
3681 		}
3682 		if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
3683 		    pf_normalize_tcp_stateful(m, off, pd, &reason, th, s,
3684 		    &s->src, &s->dst, rewrite)) {
3685 			/* This really shouldn't happen!!! */
3686 			DPFPRINTF(PF_DEBUG_URGENT,
3687 			    ("pf_normalize_tcp_stateful failed on first pkt"));
3688 			pf_normalize_tcp_cleanup(s);
3689 			pf_src_tree_remove_state(s);
3690 			STATE_DEC_COUNTERS(s);
3691 			uma_zfree(V_pf_state_z, s);
3692 			return (PF_DROP);
3693 		}
3694 	}
3695 	s->direction = pd->dir;
3696 
3697 	/*
3698 	 * sk/nk could already been setup by pf_get_translation().
3699 	 */
3700 	if (nr == NULL) {
3701 		KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p",
3702 		    __func__, nr, sk, nk));
3703 		sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport);
3704 		if (sk == NULL)
3705 			goto csfailed;
3706 		nk = sk;
3707 	} else
3708 		KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p",
3709 		    __func__, nr, sk, nk));
3710 
3711 	/* Swap sk/nk for PF_OUT. */
3712 	if (pf_state_insert(BOUND_IFACE(r, kif),
3713 	    (pd->dir == PF_IN) ? sk : nk,
3714 	    (pd->dir == PF_IN) ? nk : sk, s)) {
3715 		if (pd->proto == IPPROTO_TCP)
3716 			pf_normalize_tcp_cleanup(s);
3717 		REASON_SET(&reason, PFRES_STATEINS);
3718 		pf_src_tree_remove_state(s);
3719 		STATE_DEC_COUNTERS(s);
3720 		uma_zfree(V_pf_state_z, s);
3721 		return (PF_DROP);
3722 	} else
3723 		*sm = s;
3724 
3725 	if (tag > 0)
3726 		s->tag = tag;
3727 	if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) ==
3728 	    TH_SYN && r->keep_state == PF_STATE_SYNPROXY) {
3729 		s->src.state = PF_TCPS_PROXY_SRC;
3730 		/* undo NAT changes, if they have taken place */
3731 		if (nr != NULL) {
3732 			struct pf_state_key *skt = s->key[PF_SK_WIRE];
3733 			if (pd->dir == PF_OUT)
3734 				skt = s->key[PF_SK_STACK];
3735 			PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af);
3736 			PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af);
3737 			if (pd->sport)
3738 				*pd->sport = skt->port[pd->sidx];
3739 			if (pd->dport)
3740 				*pd->dport = skt->port[pd->didx];
3741 			if (pd->proto_sum)
3742 				*pd->proto_sum = bproto_sum;
3743 			if (pd->ip_sum)
3744 				*pd->ip_sum = bip_sum;
3745 			m_copyback(m, off, hdrlen, pd->hdr.any);
3746 		}
3747 		s->src.seqhi = htonl(arc4random());
3748 		/* Find mss option */
3749 		int rtid = M_GETFIB(m);
3750 		mss = pf_get_mss(m, off, th->th_off, pd->af);
3751 		mss = pf_calc_mss(pd->src, pd->af, rtid, mss);
3752 		mss = pf_calc_mss(pd->dst, pd->af, rtid, mss);
3753 		s->src.mss = mss;
3754 		pf_send_tcp(NULL, r, pd->af, pd->dst, pd->src, th->th_dport,
3755 		    th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
3756 		    TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL);
3757 		REASON_SET(&reason, PFRES_SYNPROXY);
3758 		return (PF_SYNPROXY_DROP);
3759 	}
3760 
3761 	return (PF_PASS);
3762 
3763 csfailed:
3764 	if (sk != NULL)
3765 		uma_zfree(V_pf_state_key_z, sk);
3766 	if (nk != NULL)
3767 		uma_zfree(V_pf_state_key_z, nk);
3768 
3769 	if (sn != NULL) {
3770 		struct pf_srchash *sh;
3771 
3772 		sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)];
3773 		PF_HASHROW_LOCK(sh);
3774 		if (--sn->states == 0 && sn->expire == 0) {
3775 			pf_unlink_src_node(sn);
3776 			uma_zfree(V_pf_sources_z, sn);
3777 			counter_u64_add(
3778 			    V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1);
3779 		}
3780 		PF_HASHROW_UNLOCK(sh);
3781 	}
3782 
3783 	if (nsn != sn && nsn != NULL) {
3784 		struct pf_srchash *sh;
3785 
3786 		sh = &V_pf_srchash[pf_hashsrc(&nsn->addr, nsn->af)];
3787 		PF_HASHROW_LOCK(sh);
3788 		if (--nsn->states == 0 && nsn->expire == 0) {
3789 			pf_unlink_src_node(nsn);
3790 			uma_zfree(V_pf_sources_z, nsn);
3791 			counter_u64_add(
3792 			    V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1);
3793 		}
3794 		PF_HASHROW_UNLOCK(sh);
3795 	}
3796 
3797 	return (PF_DROP);
3798 }
3799 
3800 static int
3801 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
3802     struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
3803     struct pf_ruleset **rsm)
3804 {
3805 	struct pf_rule		*r, *a = NULL;
3806 	struct pf_ruleset	*ruleset = NULL;
3807 	sa_family_t		 af = pd->af;
3808 	u_short			 reason;
3809 	int			 tag = -1;
3810 	int			 asd = 0;
3811 	int			 match = 0;
3812 	struct pf_anchor_stackframe	anchor_stack[PF_ANCHOR_STACKSIZE];
3813 
3814 	PF_RULES_RASSERT();
3815 
3816 	r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3817 	while (r != NULL) {
3818 		r->evaluations++;
3819 		if (pfi_kif_match(r->kif, kif) == r->ifnot)
3820 			r = r->skip[PF_SKIP_IFP].ptr;
3821 		else if (r->direction && r->direction != direction)
3822 			r = r->skip[PF_SKIP_DIR].ptr;
3823 		else if (r->af && r->af != af)
3824 			r = r->skip[PF_SKIP_AF].ptr;
3825 		else if (r->proto && r->proto != pd->proto)
3826 			r = r->skip[PF_SKIP_PROTO].ptr;
3827 		else if (PF_MISMATCHAW(&r->src.addr, pd->src, af,
3828 		    r->src.neg, kif, M_GETFIB(m)))
3829 			r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3830 		else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af,
3831 		    r->dst.neg, NULL, M_GETFIB(m)))
3832 			r = r->skip[PF_SKIP_DST_ADDR].ptr;
3833 		else if (r->tos && !(r->tos == pd->tos))
3834 			r = TAILQ_NEXT(r, entries);
3835 		else if (r->os_fingerprint != PF_OSFP_ANY)
3836 			r = TAILQ_NEXT(r, entries);
3837 		else if (pd->proto == IPPROTO_UDP &&
3838 		    (r->src.port_op || r->dst.port_op))
3839 			r = TAILQ_NEXT(r, entries);
3840 		else if (pd->proto == IPPROTO_TCP &&
3841 		    (r->src.port_op || r->dst.port_op || r->flagset))
3842 			r = TAILQ_NEXT(r, entries);
3843 		else if ((pd->proto == IPPROTO_ICMP ||
3844 		    pd->proto == IPPROTO_ICMPV6) &&
3845 		    (r->type || r->code))
3846 			r = TAILQ_NEXT(r, entries);
3847 		else if (r->prio &&
3848 		    !pf_match_ieee8021q_pcp(r->prio, m))
3849 			r = TAILQ_NEXT(r, entries);
3850 		else if (r->prob && r->prob <=
3851 		    (arc4random() % (UINT_MAX - 1) + 1))
3852 			r = TAILQ_NEXT(r, entries);
3853 		else if (r->match_tag && !pf_match_tag(m, r, &tag,
3854 		    pd->pf_mtag ? pd->pf_mtag->tag : 0))
3855 			r = TAILQ_NEXT(r, entries);
3856 		else {
3857 			if (r->anchor == NULL) {
3858 				match = 1;
3859 				*rm = r;
3860 				*am = a;
3861 				*rsm = ruleset;
3862 				if ((*rm)->quick)
3863 					break;
3864 				r = TAILQ_NEXT(r, entries);
3865 			} else
3866 				pf_step_into_anchor(anchor_stack, &asd,
3867 				    &ruleset, PF_RULESET_FILTER, &r, &a,
3868 				    &match);
3869 		}
3870 		if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd,
3871 		    &ruleset, PF_RULESET_FILTER, &r, &a, &match))
3872 			break;
3873 	}
3874 	r = *rm;
3875 	a = *am;
3876 	ruleset = *rsm;
3877 
3878 	REASON_SET(&reason, PFRES_MATCH);
3879 
3880 	if (r->log)
3881 		PFLOG_PACKET(kif, m, af, direction, reason, r, a, ruleset, pd,
3882 		    1);
3883 
3884 	if (r->action != PF_PASS)
3885 		return (PF_DROP);
3886 
3887 	if (tag > 0 && pf_tag_packet(m, pd, tag)) {
3888 		REASON_SET(&reason, PFRES_MEMORY);
3889 		return (PF_DROP);
3890 	}
3891 
3892 	return (PF_PASS);
3893 }
3894 
3895 static int
3896 pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst,
3897 	struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off,
3898 	struct pf_pdesc *pd, u_short *reason, int *copyback)
3899 {
3900 	struct tcphdr		*th = pd->hdr.tcp;
3901 	u_int16_t		 win = ntohs(th->th_win);
3902 	u_int32_t		 ack, end, seq, orig_seq;
3903 	u_int8_t		 sws, dws;
3904 	int			 ackskew;
3905 
3906 	if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
3907 		sws = src->wscale & PF_WSCALE_MASK;
3908 		dws = dst->wscale & PF_WSCALE_MASK;
3909 	} else
3910 		sws = dws = 0;
3911 
3912 	/*
3913 	 * Sequence tracking algorithm from Guido van Rooij's paper:
3914 	 *   http://www.madison-gurkha.com/publications/tcp_filtering/
3915 	 *	tcp_filtering.ps
3916 	 */
3917 
3918 	orig_seq = seq = ntohl(th->th_seq);
3919 	if (src->seqlo == 0) {
3920 		/* First packet from this end. Set its state */
3921 
3922 		if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
3923 		    src->scrub == NULL) {
3924 			if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
3925 				REASON_SET(reason, PFRES_MEMORY);
3926 				return (PF_DROP);
3927 			}
3928 		}
3929 
3930 		/* Deferred generation of sequence number modulator */
3931 		if (dst->seqdiff && !src->seqdiff) {
3932 			/* use random iss for the TCP server */
3933 			while ((src->seqdiff = arc4random() - seq) == 0)
3934 				;
3935 			ack = ntohl(th->th_ack) - dst->seqdiff;
3936 			pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq +
3937 			    src->seqdiff), 0);
3938 			pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0);
3939 			*copyback = 1;
3940 		} else {
3941 			ack = ntohl(th->th_ack);
3942 		}
3943 
3944 		end = seq + pd->p_len;
3945 		if (th->th_flags & TH_SYN) {
3946 			end++;
3947 			if (dst->wscale & PF_WSCALE_FLAG) {
3948 				src->wscale = pf_get_wscale(m, off, th->th_off,
3949 				    pd->af);
3950 				if (src->wscale & PF_WSCALE_FLAG) {
3951 					/* Remove scale factor from initial
3952 					 * window */
3953 					sws = src->wscale & PF_WSCALE_MASK;
3954 					win = ((u_int32_t)win + (1 << sws) - 1)
3955 					    >> sws;
3956 					dws = dst->wscale & PF_WSCALE_MASK;
3957 				} else {
3958 					/* fixup other window */
3959 					dst->max_win <<= dst->wscale &
3960 					    PF_WSCALE_MASK;
3961 					/* in case of a retrans SYN|ACK */
3962 					dst->wscale = 0;
3963 				}
3964 			}
3965 		}
3966 		if (th->th_flags & TH_FIN)
3967 			end++;
3968 
3969 		src->seqlo = seq;
3970 		if (src->state < TCPS_SYN_SENT)
3971 			src->state = TCPS_SYN_SENT;
3972 
3973 		/*
3974 		 * May need to slide the window (seqhi may have been set by
3975 		 * the crappy stack check or if we picked up the connection
3976 		 * after establishment)
3977 		 */
3978 		if (src->seqhi == 1 ||
3979 		    SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
3980 			src->seqhi = end + MAX(1, dst->max_win << dws);
3981 		if (win > src->max_win)
3982 			src->max_win = win;
3983 
3984 	} else {
3985 		ack = ntohl(th->th_ack) - dst->seqdiff;
3986 		if (src->seqdiff) {
3987 			/* Modulate sequence numbers */
3988 			pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq +
3989 			    src->seqdiff), 0);
3990 			pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0);
3991 			*copyback = 1;
3992 		}
3993 		end = seq + pd->p_len;
3994 		if (th->th_flags & TH_SYN)
3995 			end++;
3996 		if (th->th_flags & TH_FIN)
3997 			end++;
3998 	}
3999 
4000 	if ((th->th_flags & TH_ACK) == 0) {
4001 		/* Let it pass through the ack skew check */
4002 		ack = dst->seqlo;
4003 	} else if ((ack == 0 &&
4004 	    (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
4005 	    /* broken tcp stacks do not set ack */
4006 	    (dst->state < TCPS_SYN_SENT)) {
4007 		/*
4008 		 * Many stacks (ours included) will set the ACK number in an
4009 		 * FIN|ACK if the SYN times out -- no sequence to ACK.
4010 		 */
4011 		ack = dst->seqlo;
4012 	}
4013 
4014 	if (seq == end) {
4015 		/* Ease sequencing restrictions on no data packets */
4016 		seq = src->seqlo;
4017 		end = seq;
4018 	}
4019 
4020 	ackskew = dst->seqlo - ack;
4021 
4022 
4023 	/*
4024 	 * Need to demodulate the sequence numbers in any TCP SACK options
4025 	 * (Selective ACK). We could optionally validate the SACK values
4026 	 * against the current ACK window, either forwards or backwards, but
4027 	 * I'm not confident that SACK has been implemented properly
4028 	 * everywhere. It wouldn't surprise me if several stacks accidentally
4029 	 * SACK too far backwards of previously ACKed data. There really aren't
4030 	 * any security implications of bad SACKing unless the target stack
4031 	 * doesn't validate the option length correctly. Someone trying to
4032 	 * spoof into a TCP connection won't bother blindly sending SACK
4033 	 * options anyway.
4034 	 */
4035 	if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) {
4036 		if (pf_modulate_sack(m, off, pd, th, dst))
4037 			*copyback = 1;
4038 	}
4039 
4040 
4041 #define	MAXACKWINDOW (0xffff + 1500)	/* 1500 is an arbitrary fudge factor */
4042 	if (SEQ_GEQ(src->seqhi, end) &&
4043 	    /* Last octet inside other's window space */
4044 	    SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
4045 	    /* Retrans: not more than one window back */
4046 	    (ackskew >= -MAXACKWINDOW) &&
4047 	    /* Acking not more than one reassembled fragment backwards */
4048 	    (ackskew <= (MAXACKWINDOW << sws)) &&
4049 	    /* Acking not more than one window forward */
4050 	    ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo ||
4051 	    (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) ||
4052 	    (pd->flags & PFDESC_IP_REAS) == 0)) {
4053 	    /* Require an exact/+1 sequence match on resets when possible */
4054 
4055 		if (dst->scrub || src->scrub) {
4056 			if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4057 			    *state, src, dst, copyback))
4058 				return (PF_DROP);
4059 		}
4060 
4061 		/* update max window */
4062 		if (src->max_win < win)
4063 			src->max_win = win;
4064 		/* synchronize sequencing */
4065 		if (SEQ_GT(end, src->seqlo))
4066 			src->seqlo = end;
4067 		/* slide the window of what the other end can send */
4068 		if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4069 			dst->seqhi = ack + MAX((win << sws), 1);
4070 
4071 
4072 		/* update states */
4073 		if (th->th_flags & TH_SYN)
4074 			if (src->state < TCPS_SYN_SENT)
4075 				src->state = TCPS_SYN_SENT;
4076 		if (th->th_flags & TH_FIN)
4077 			if (src->state < TCPS_CLOSING)
4078 				src->state = TCPS_CLOSING;
4079 		if (th->th_flags & TH_ACK) {
4080 			if (dst->state == TCPS_SYN_SENT) {
4081 				dst->state = TCPS_ESTABLISHED;
4082 				if (src->state == TCPS_ESTABLISHED &&
4083 				    (*state)->src_node != NULL &&
4084 				    pf_src_connlimit(state)) {
4085 					REASON_SET(reason, PFRES_SRCLIMIT);
4086 					return (PF_DROP);
4087 				}
4088 			} else if (dst->state == TCPS_CLOSING)
4089 				dst->state = TCPS_FIN_WAIT_2;
4090 		}
4091 		if (th->th_flags & TH_RST)
4092 			src->state = dst->state = TCPS_TIME_WAIT;
4093 
4094 		/* update expire time */
4095 		(*state)->expire = time_uptime;
4096 		if (src->state >= TCPS_FIN_WAIT_2 &&
4097 		    dst->state >= TCPS_FIN_WAIT_2)
4098 			(*state)->timeout = PFTM_TCP_CLOSED;
4099 		else if (src->state >= TCPS_CLOSING &&
4100 		    dst->state >= TCPS_CLOSING)
4101 			(*state)->timeout = PFTM_TCP_FIN_WAIT;
4102 		else if (src->state < TCPS_ESTABLISHED ||
4103 		    dst->state < TCPS_ESTABLISHED)
4104 			(*state)->timeout = PFTM_TCP_OPENING;
4105 		else if (src->state >= TCPS_CLOSING ||
4106 		    dst->state >= TCPS_CLOSING)
4107 			(*state)->timeout = PFTM_TCP_CLOSING;
4108 		else
4109 			(*state)->timeout = PFTM_TCP_ESTABLISHED;
4110 
4111 		/* Fall through to PASS packet */
4112 
4113 	} else if ((dst->state < TCPS_SYN_SENT ||
4114 		dst->state >= TCPS_FIN_WAIT_2 ||
4115 		src->state >= TCPS_FIN_WAIT_2) &&
4116 	    SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
4117 	    /* Within a window forward of the originating packet */
4118 	    SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
4119 	    /* Within a window backward of the originating packet */
4120 
4121 		/*
4122 		 * This currently handles three situations:
4123 		 *  1) Stupid stacks will shotgun SYNs before their peer
4124 		 *     replies.
4125 		 *  2) When PF catches an already established stream (the
4126 		 *     firewall rebooted, the state table was flushed, routes
4127 		 *     changed...)
4128 		 *  3) Packets get funky immediately after the connection
4129 		 *     closes (this should catch Solaris spurious ACK|FINs
4130 		 *     that web servers like to spew after a close)
4131 		 *
4132 		 * This must be a little more careful than the above code
4133 		 * since packet floods will also be caught here. We don't
4134 		 * update the TTL here to mitigate the damage of a packet
4135 		 * flood and so the same code can handle awkward establishment
4136 		 * and a loosened connection close.
4137 		 * In the establishment case, a correct peer response will
4138 		 * validate the connection, go through the normal state code
4139 		 * and keep updating the state TTL.
4140 		 */
4141 
4142 		if (V_pf_status.debug >= PF_DEBUG_MISC) {
4143 			printf("pf: loose state match: ");
4144 			pf_print_state(*state);
4145 			pf_print_flags(th->th_flags);
4146 			printf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4147 			    "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack,
4148 			    pd->p_len, ackskew, (unsigned long long)(*state)->packets[0],
4149 			    (unsigned long long)(*state)->packets[1],
4150 			    pd->dir == PF_IN ? "in" : "out",
4151 			    pd->dir == (*state)->direction ? "fwd" : "rev");
4152 		}
4153 
4154 		if (dst->scrub || src->scrub) {
4155 			if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4156 			    *state, src, dst, copyback))
4157 				return (PF_DROP);
4158 		}
4159 
4160 		/* update max window */
4161 		if (src->max_win < win)
4162 			src->max_win = win;
4163 		/* synchronize sequencing */
4164 		if (SEQ_GT(end, src->seqlo))
4165 			src->seqlo = end;
4166 		/* slide the window of what the other end can send */
4167 		if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4168 			dst->seqhi = ack + MAX((win << sws), 1);
4169 
4170 		/*
4171 		 * Cannot set dst->seqhi here since this could be a shotgunned
4172 		 * SYN and not an already established connection.
4173 		 */
4174 
4175 		if (th->th_flags & TH_FIN)
4176 			if (src->state < TCPS_CLOSING)
4177 				src->state = TCPS_CLOSING;
4178 		if (th->th_flags & TH_RST)
4179 			src->state = dst->state = TCPS_TIME_WAIT;
4180 
4181 		/* Fall through to PASS packet */
4182 
4183 	} else {
4184 		if ((*state)->dst.state == TCPS_SYN_SENT &&
4185 		    (*state)->src.state == TCPS_SYN_SENT) {
4186 			/* Send RST for state mismatches during handshake */
4187 			if (!(th->th_flags & TH_RST))
4188 				pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
4189 				    pd->dst, pd->src, th->th_dport,
4190 				    th->th_sport, ntohl(th->th_ack), 0,
4191 				    TH_RST, 0, 0,
4192 				    (*state)->rule.ptr->return_ttl, 1, 0,
4193 				    kif->pfik_ifp);
4194 			src->seqlo = 0;
4195 			src->seqhi = 1;
4196 			src->max_win = 1;
4197 		} else if (V_pf_status.debug >= PF_DEBUG_MISC) {
4198 			printf("pf: BAD state: ");
4199 			pf_print_state(*state);
4200 			pf_print_flags(th->th_flags);
4201 			printf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4202 			    "pkts=%llu:%llu dir=%s,%s\n",
4203 			    seq, orig_seq, ack, pd->p_len, ackskew,
4204 			    (unsigned long long)(*state)->packets[0],
4205 			    (unsigned long long)(*state)->packets[1],
4206 			    pd->dir == PF_IN ? "in" : "out",
4207 			    pd->dir == (*state)->direction ? "fwd" : "rev");
4208 			printf("pf: State failure on: %c %c %c %c | %c %c\n",
4209 			    SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
4210 			    SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
4211 			    ' ': '2',
4212 			    (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
4213 			    (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
4214 			    SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
4215 			    SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
4216 		}
4217 		REASON_SET(reason, PFRES_BADSTATE);
4218 		return (PF_DROP);
4219 	}
4220 
4221 	return (PF_PASS);
4222 }
4223 
4224 static int
4225 pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst,
4226 	struct pf_state **state, struct pf_pdesc *pd, u_short *reason)
4227 {
4228 	struct tcphdr		*th = pd->hdr.tcp;
4229 
4230 	if (th->th_flags & TH_SYN)
4231 		if (src->state < TCPS_SYN_SENT)
4232 			src->state = TCPS_SYN_SENT;
4233 	if (th->th_flags & TH_FIN)
4234 		if (src->state < TCPS_CLOSING)
4235 			src->state = TCPS_CLOSING;
4236 	if (th->th_flags & TH_ACK) {
4237 		if (dst->state == TCPS_SYN_SENT) {
4238 			dst->state = TCPS_ESTABLISHED;
4239 			if (src->state == TCPS_ESTABLISHED &&
4240 			    (*state)->src_node != NULL &&
4241 			    pf_src_connlimit(state)) {
4242 				REASON_SET(reason, PFRES_SRCLIMIT);
4243 				return (PF_DROP);
4244 			}
4245 		} else if (dst->state == TCPS_CLOSING) {
4246 			dst->state = TCPS_FIN_WAIT_2;
4247 		} else if (src->state == TCPS_SYN_SENT &&
4248 		    dst->state < TCPS_SYN_SENT) {
4249 			/*
4250 			 * Handle a special sloppy case where we only see one
4251 			 * half of the connection. If there is a ACK after
4252 			 * the initial SYN without ever seeing a packet from
4253 			 * the destination, set the connection to established.
4254 			 */
4255 			dst->state = src->state = TCPS_ESTABLISHED;
4256 			if ((*state)->src_node != NULL &&
4257 			    pf_src_connlimit(state)) {
4258 				REASON_SET(reason, PFRES_SRCLIMIT);
4259 				return (PF_DROP);
4260 			}
4261 		} else if (src->state == TCPS_CLOSING &&
4262 		    dst->state == TCPS_ESTABLISHED &&
4263 		    dst->seqlo == 0) {
4264 			/*
4265 			 * Handle the closing of half connections where we
4266 			 * don't see the full bidirectional FIN/ACK+ACK
4267 			 * handshake.
4268 			 */
4269 			dst->state = TCPS_CLOSING;
4270 		}
4271 	}
4272 	if (th->th_flags & TH_RST)
4273 		src->state = dst->state = TCPS_TIME_WAIT;
4274 
4275 	/* update expire time */
4276 	(*state)->expire = time_uptime;
4277 	if (src->state >= TCPS_FIN_WAIT_2 &&
4278 	    dst->state >= TCPS_FIN_WAIT_2)
4279 		(*state)->timeout = PFTM_TCP_CLOSED;
4280 	else if (src->state >= TCPS_CLOSING &&
4281 	    dst->state >= TCPS_CLOSING)
4282 		(*state)->timeout = PFTM_TCP_FIN_WAIT;
4283 	else if (src->state < TCPS_ESTABLISHED ||
4284 	    dst->state < TCPS_ESTABLISHED)
4285 		(*state)->timeout = PFTM_TCP_OPENING;
4286 	else if (src->state >= TCPS_CLOSING ||
4287 	    dst->state >= TCPS_CLOSING)
4288 		(*state)->timeout = PFTM_TCP_CLOSING;
4289 	else
4290 		(*state)->timeout = PFTM_TCP_ESTABLISHED;
4291 
4292 	return (PF_PASS);
4293 }
4294 
4295 static int
4296 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
4297     struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
4298     u_short *reason)
4299 {
4300 	struct pf_state_key_cmp	 key;
4301 	struct tcphdr		*th = pd->hdr.tcp;
4302 	int			 copyback = 0;
4303 	struct pf_state_peer	*src, *dst;
4304 	struct pf_state_key	*sk;
4305 
4306 	bzero(&key, sizeof(key));
4307 	key.af = pd->af;
4308 	key.proto = IPPROTO_TCP;
4309 	if (direction == PF_IN)	{	/* wire side, straight */
4310 		PF_ACPY(&key.addr[0], pd->src, key.af);
4311 		PF_ACPY(&key.addr[1], pd->dst, key.af);
4312 		key.port[0] = th->th_sport;
4313 		key.port[1] = th->th_dport;
4314 	} else {			/* stack side, reverse */
4315 		PF_ACPY(&key.addr[1], pd->src, key.af);
4316 		PF_ACPY(&key.addr[0], pd->dst, key.af);
4317 		key.port[1] = th->th_sport;
4318 		key.port[0] = th->th_dport;
4319 	}
4320 
4321 	STATE_LOOKUP(kif, &key, direction, *state, pd);
4322 
4323 	if (direction == (*state)->direction) {
4324 		src = &(*state)->src;
4325 		dst = &(*state)->dst;
4326 	} else {
4327 		src = &(*state)->dst;
4328 		dst = &(*state)->src;
4329 	}
4330 
4331 	sk = (*state)->key[pd->didx];
4332 
4333 	if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
4334 		if (direction != (*state)->direction) {
4335 			REASON_SET(reason, PFRES_SYNPROXY);
4336 			return (PF_SYNPROXY_DROP);
4337 		}
4338 		if (th->th_flags & TH_SYN) {
4339 			if (ntohl(th->th_seq) != (*state)->src.seqlo) {
4340 				REASON_SET(reason, PFRES_SYNPROXY);
4341 				return (PF_DROP);
4342 			}
4343 			pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst,
4344 			    pd->src, th->th_dport, th->th_sport,
4345 			    (*state)->src.seqhi, ntohl(th->th_seq) + 1,
4346 			    TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 0, NULL);
4347 			REASON_SET(reason, PFRES_SYNPROXY);
4348 			return (PF_SYNPROXY_DROP);
4349 		} else if (!(th->th_flags & TH_ACK) ||
4350 		    (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4351 		    (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4352 			REASON_SET(reason, PFRES_SYNPROXY);
4353 			return (PF_DROP);
4354 		} else if ((*state)->src_node != NULL &&
4355 		    pf_src_connlimit(state)) {
4356 			REASON_SET(reason, PFRES_SRCLIMIT);
4357 			return (PF_DROP);
4358 		} else
4359 			(*state)->src.state = PF_TCPS_PROXY_DST;
4360 	}
4361 	if ((*state)->src.state == PF_TCPS_PROXY_DST) {
4362 		if (direction == (*state)->direction) {
4363 			if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
4364 			    (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4365 			    (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4366 				REASON_SET(reason, PFRES_SYNPROXY);
4367 				return (PF_DROP);
4368 			}
4369 			(*state)->src.max_win = MAX(ntohs(th->th_win), 1);
4370 			if ((*state)->dst.seqhi == 1)
4371 				(*state)->dst.seqhi = htonl(arc4random());
4372 			pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
4373 			    &sk->addr[pd->sidx], &sk->addr[pd->didx],
4374 			    sk->port[pd->sidx], sk->port[pd->didx],
4375 			    (*state)->dst.seqhi, 0, TH_SYN, 0,
4376 			    (*state)->src.mss, 0, 0, (*state)->tag, NULL);
4377 			REASON_SET(reason, PFRES_SYNPROXY);
4378 			return (PF_SYNPROXY_DROP);
4379 		} else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
4380 		    (TH_SYN|TH_ACK)) ||
4381 		    (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) {
4382 			REASON_SET(reason, PFRES_SYNPROXY);
4383 			return (PF_DROP);
4384 		} else {
4385 			(*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
4386 			(*state)->dst.seqlo = ntohl(th->th_seq);
4387 			pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst,
4388 			    pd->src, th->th_dport, th->th_sport,
4389 			    ntohl(th->th_ack), ntohl(th->th_seq) + 1,
4390 			    TH_ACK, (*state)->src.max_win, 0, 0, 0,
4391 			    (*state)->tag, NULL);
4392 			pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
4393 			    &sk->addr[pd->sidx], &sk->addr[pd->didx],
4394 			    sk->port[pd->sidx], sk->port[pd->didx],
4395 			    (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
4396 			    TH_ACK, (*state)->dst.max_win, 0, 0, 1, 0, NULL);
4397 			(*state)->src.seqdiff = (*state)->dst.seqhi -
4398 			    (*state)->src.seqlo;
4399 			(*state)->dst.seqdiff = (*state)->src.seqhi -
4400 			    (*state)->dst.seqlo;
4401 			(*state)->src.seqhi = (*state)->src.seqlo +
4402 			    (*state)->dst.max_win;
4403 			(*state)->dst.seqhi = (*state)->dst.seqlo +
4404 			    (*state)->src.max_win;
4405 			(*state)->src.wscale = (*state)->dst.wscale = 0;
4406 			(*state)->src.state = (*state)->dst.state =
4407 			    TCPS_ESTABLISHED;
4408 			REASON_SET(reason, PFRES_SYNPROXY);
4409 			return (PF_SYNPROXY_DROP);
4410 		}
4411 	}
4412 
4413 	if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) &&
4414 	    dst->state >= TCPS_FIN_WAIT_2 &&
4415 	    src->state >= TCPS_FIN_WAIT_2) {
4416 		if (V_pf_status.debug >= PF_DEBUG_MISC) {
4417 			printf("pf: state reuse ");
4418 			pf_print_state(*state);
4419 			pf_print_flags(th->th_flags);
4420 			printf("\n");
4421 		}
4422 		/* XXX make sure it's the same direction ?? */
4423 		(*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
4424 		pf_unlink_state(*state, PF_ENTER_LOCKED);
4425 		*state = NULL;
4426 		return (PF_DROP);
4427 	}
4428 
4429 	if ((*state)->state_flags & PFSTATE_SLOPPY) {
4430 		if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP)
4431 			return (PF_DROP);
4432 	} else {
4433 		if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason,
4434 		    &copyback) == PF_DROP)
4435 			return (PF_DROP);
4436 	}
4437 
4438 	/* translate source/destination address, if necessary */
4439 	if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4440 		struct pf_state_key *nk = (*state)->key[pd->didx];
4441 
4442 		if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4443 		    nk->port[pd->sidx] != th->th_sport)
4444 			pf_change_ap(m, pd->src, &th->th_sport,
4445 			    pd->ip_sum, &th->th_sum, &nk->addr[pd->sidx],
4446 			    nk->port[pd->sidx], 0, pd->af);
4447 
4448 		if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4449 		    nk->port[pd->didx] != th->th_dport)
4450 			pf_change_ap(m, pd->dst, &th->th_dport,
4451 			    pd->ip_sum, &th->th_sum, &nk->addr[pd->didx],
4452 			    nk->port[pd->didx], 0, pd->af);
4453 		copyback = 1;
4454 	}
4455 
4456 	/* Copyback sequence modulation or stateful scrub changes if needed */
4457 	if (copyback)
4458 		m_copyback(m, off, sizeof(*th), (caddr_t)th);
4459 
4460 	return (PF_PASS);
4461 }
4462 
4463 static int
4464 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
4465     struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4466 {
4467 	struct pf_state_peer	*src, *dst;
4468 	struct pf_state_key_cmp	 key;
4469 	struct udphdr		*uh = pd->hdr.udp;
4470 
4471 	bzero(&key, sizeof(key));
4472 	key.af = pd->af;
4473 	key.proto = IPPROTO_UDP;
4474 	if (direction == PF_IN)	{	/* wire side, straight */
4475 		PF_ACPY(&key.addr[0], pd->src, key.af);
4476 		PF_ACPY(&key.addr[1], pd->dst, key.af);
4477 		key.port[0] = uh->uh_sport;
4478 		key.port[1] = uh->uh_dport;
4479 	} else {			/* stack side, reverse */
4480 		PF_ACPY(&key.addr[1], pd->src, key.af);
4481 		PF_ACPY(&key.addr[0], pd->dst, key.af);
4482 		key.port[1] = uh->uh_sport;
4483 		key.port[0] = uh->uh_dport;
4484 	}
4485 
4486 	STATE_LOOKUP(kif, &key, direction, *state, pd);
4487 
4488 	if (direction == (*state)->direction) {
4489 		src = &(*state)->src;
4490 		dst = &(*state)->dst;
4491 	} else {
4492 		src = &(*state)->dst;
4493 		dst = &(*state)->src;
4494 	}
4495 
4496 	/* update states */
4497 	if (src->state < PFUDPS_SINGLE)
4498 		src->state = PFUDPS_SINGLE;
4499 	if (dst->state == PFUDPS_SINGLE)
4500 		dst->state = PFUDPS_MULTIPLE;
4501 
4502 	/* update expire time */
4503 	(*state)->expire = time_uptime;
4504 	if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
4505 		(*state)->timeout = PFTM_UDP_MULTIPLE;
4506 	else
4507 		(*state)->timeout = PFTM_UDP_SINGLE;
4508 
4509 	/* translate source/destination address, if necessary */
4510 	if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4511 		struct pf_state_key *nk = (*state)->key[pd->didx];
4512 
4513 		if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4514 		    nk->port[pd->sidx] != uh->uh_sport)
4515 			pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum,
4516 			    &uh->uh_sum, &nk->addr[pd->sidx],
4517 			    nk->port[pd->sidx], 1, pd->af);
4518 
4519 		if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4520 		    nk->port[pd->didx] != uh->uh_dport)
4521 			pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum,
4522 			    &uh->uh_sum, &nk->addr[pd->didx],
4523 			    nk->port[pd->didx], 1, pd->af);
4524 		m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
4525 	}
4526 
4527 	return (PF_PASS);
4528 }
4529 
4530 static int
4531 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
4532     struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason)
4533 {
4534 	struct pf_addr  *saddr = pd->src, *daddr = pd->dst;
4535 	u_int16_t	 icmpid = 0, *icmpsum;
4536 	u_int8_t	 icmptype;
4537 	int		 state_icmp = 0;
4538 	struct pf_state_key_cmp key;
4539 
4540 	bzero(&key, sizeof(key));
4541 	switch (pd->proto) {
4542 #ifdef INET
4543 	case IPPROTO_ICMP:
4544 		icmptype = pd->hdr.icmp->icmp_type;
4545 		icmpid = pd->hdr.icmp->icmp_id;
4546 		icmpsum = &pd->hdr.icmp->icmp_cksum;
4547 
4548 		if (icmptype == ICMP_UNREACH ||
4549 		    icmptype == ICMP_SOURCEQUENCH ||
4550 		    icmptype == ICMP_REDIRECT ||
4551 		    icmptype == ICMP_TIMXCEED ||
4552 		    icmptype == ICMP_PARAMPROB)
4553 			state_icmp++;
4554 		break;
4555 #endif /* INET */
4556 #ifdef INET6
4557 	case IPPROTO_ICMPV6:
4558 		icmptype = pd->hdr.icmp6->icmp6_type;
4559 		icmpid = pd->hdr.icmp6->icmp6_id;
4560 		icmpsum = &pd->hdr.icmp6->icmp6_cksum;
4561 
4562 		if (icmptype == ICMP6_DST_UNREACH ||
4563 		    icmptype == ICMP6_PACKET_TOO_BIG ||
4564 		    icmptype == ICMP6_TIME_EXCEEDED ||
4565 		    icmptype == ICMP6_PARAM_PROB)
4566 			state_icmp++;
4567 		break;
4568 #endif /* INET6 */
4569 	}
4570 
4571 	if (!state_icmp) {
4572 
4573 		/*
4574 		 * ICMP query/reply message not related to a TCP/UDP packet.
4575 		 * Search for an ICMP state.
4576 		 */
4577 		key.af = pd->af;
4578 		key.proto = pd->proto;
4579 		key.port[0] = key.port[1] = icmpid;
4580 		if (direction == PF_IN)	{	/* wire side, straight */
4581 			PF_ACPY(&key.addr[0], pd->src, key.af);
4582 			PF_ACPY(&key.addr[1], pd->dst, key.af);
4583 		} else {			/* stack side, reverse */
4584 			PF_ACPY(&key.addr[1], pd->src, key.af);
4585 			PF_ACPY(&key.addr[0], pd->dst, key.af);
4586 		}
4587 
4588 		STATE_LOOKUP(kif, &key, direction, *state, pd);
4589 
4590 		(*state)->expire = time_uptime;
4591 		(*state)->timeout = PFTM_ICMP_ERROR_REPLY;
4592 
4593 		/* translate source/destination address, if necessary */
4594 		if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4595 			struct pf_state_key *nk = (*state)->key[pd->didx];
4596 
4597 			switch (pd->af) {
4598 #ifdef INET
4599 			case AF_INET:
4600 				if (PF_ANEQ(pd->src,
4601 				    &nk->addr[pd->sidx], AF_INET))
4602 					pf_change_a(&saddr->v4.s_addr,
4603 					    pd->ip_sum,
4604 					    nk->addr[pd->sidx].v4.s_addr, 0);
4605 
4606 				if (PF_ANEQ(pd->dst, &nk->addr[pd->didx],
4607 				    AF_INET))
4608 					pf_change_a(&daddr->v4.s_addr,
4609 					    pd->ip_sum,
4610 					    nk->addr[pd->didx].v4.s_addr, 0);
4611 
4612 				if (nk->port[0] !=
4613 				    pd->hdr.icmp->icmp_id) {
4614 					pd->hdr.icmp->icmp_cksum =
4615 					    pf_cksum_fixup(
4616 					    pd->hdr.icmp->icmp_cksum, icmpid,
4617 					    nk->port[pd->sidx], 0);
4618 					pd->hdr.icmp->icmp_id =
4619 					    nk->port[pd->sidx];
4620 				}
4621 
4622 				m_copyback(m, off, ICMP_MINLEN,
4623 				    (caddr_t )pd->hdr.icmp);
4624 				break;
4625 #endif /* INET */
4626 #ifdef INET6
4627 			case AF_INET6:
4628 				if (PF_ANEQ(pd->src,
4629 				    &nk->addr[pd->sidx], AF_INET6))
4630 					pf_change_a6(saddr,
4631 					    &pd->hdr.icmp6->icmp6_cksum,
4632 					    &nk->addr[pd->sidx], 0);
4633 
4634 				if (PF_ANEQ(pd->dst,
4635 				    &nk->addr[pd->didx], AF_INET6))
4636 					pf_change_a6(daddr,
4637 					    &pd->hdr.icmp6->icmp6_cksum,
4638 					    &nk->addr[pd->didx], 0);
4639 
4640 				m_copyback(m, off, sizeof(struct icmp6_hdr),
4641 				    (caddr_t )pd->hdr.icmp6);
4642 				break;
4643 #endif /* INET6 */
4644 			}
4645 		}
4646 		return (PF_PASS);
4647 
4648 	} else {
4649 		/*
4650 		 * ICMP error message in response to a TCP/UDP packet.
4651 		 * Extract the inner TCP/UDP header and search for that state.
4652 		 */
4653 
4654 		struct pf_pdesc	pd2;
4655 		bzero(&pd2, sizeof pd2);
4656 #ifdef INET
4657 		struct ip	h2;
4658 #endif /* INET */
4659 #ifdef INET6
4660 		struct ip6_hdr	h2_6;
4661 		int		terminal = 0;
4662 #endif /* INET6 */
4663 		int		ipoff2 = 0;
4664 		int		off2 = 0;
4665 
4666 		pd2.af = pd->af;
4667 		/* Payload packet is from the opposite direction. */
4668 		pd2.sidx = (direction == PF_IN) ? 1 : 0;
4669 		pd2.didx = (direction == PF_IN) ? 0 : 1;
4670 		switch (pd->af) {
4671 #ifdef INET
4672 		case AF_INET:
4673 			/* offset of h2 in mbuf chain */
4674 			ipoff2 = off + ICMP_MINLEN;
4675 
4676 			if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
4677 			    NULL, reason, pd2.af)) {
4678 				DPFPRINTF(PF_DEBUG_MISC,
4679 				    ("pf: ICMP error message too short "
4680 				    "(ip)\n"));
4681 				return (PF_DROP);
4682 			}
4683 			/*
4684 			 * ICMP error messages don't refer to non-first
4685 			 * fragments
4686 			 */
4687 			if (h2.ip_off & htons(IP_OFFMASK)) {
4688 				REASON_SET(reason, PFRES_FRAG);
4689 				return (PF_DROP);
4690 			}
4691 
4692 			/* offset of protocol header that follows h2 */
4693 			off2 = ipoff2 + (h2.ip_hl << 2);
4694 
4695 			pd2.proto = h2.ip_p;
4696 			pd2.src = (struct pf_addr *)&h2.ip_src;
4697 			pd2.dst = (struct pf_addr *)&h2.ip_dst;
4698 			pd2.ip_sum = &h2.ip_sum;
4699 			break;
4700 #endif /* INET */
4701 #ifdef INET6
4702 		case AF_INET6:
4703 			ipoff2 = off + sizeof(struct icmp6_hdr);
4704 
4705 			if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
4706 			    NULL, reason, pd2.af)) {
4707 				DPFPRINTF(PF_DEBUG_MISC,
4708 				    ("pf: ICMP error message too short "
4709 				    "(ip6)\n"));
4710 				return (PF_DROP);
4711 			}
4712 			pd2.proto = h2_6.ip6_nxt;
4713 			pd2.src = (struct pf_addr *)&h2_6.ip6_src;
4714 			pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
4715 			pd2.ip_sum = NULL;
4716 			off2 = ipoff2 + sizeof(h2_6);
4717 			do {
4718 				switch (pd2.proto) {
4719 				case IPPROTO_FRAGMENT:
4720 					/*
4721 					 * ICMPv6 error messages for
4722 					 * non-first fragments
4723 					 */
4724 					REASON_SET(reason, PFRES_FRAG);
4725 					return (PF_DROP);
4726 				case IPPROTO_AH:
4727 				case IPPROTO_HOPOPTS:
4728 				case IPPROTO_ROUTING:
4729 				case IPPROTO_DSTOPTS: {
4730 					/* get next header and header length */
4731 					struct ip6_ext opt6;
4732 
4733 					if (!pf_pull_hdr(m, off2, &opt6,
4734 					    sizeof(opt6), NULL, reason,
4735 					    pd2.af)) {
4736 						DPFPRINTF(PF_DEBUG_MISC,
4737 						    ("pf: ICMPv6 short opt\n"));
4738 						return (PF_DROP);
4739 					}
4740 					if (pd2.proto == IPPROTO_AH)
4741 						off2 += (opt6.ip6e_len + 2) * 4;
4742 					else
4743 						off2 += (opt6.ip6e_len + 1) * 8;
4744 					pd2.proto = opt6.ip6e_nxt;
4745 					/* goto the next header */
4746 					break;
4747 				}
4748 				default:
4749 					terminal++;
4750 					break;
4751 				}
4752 			} while (!terminal);
4753 			break;
4754 #endif /* INET6 */
4755 		}
4756 
4757 		switch (pd2.proto) {
4758 		case IPPROTO_TCP: {
4759 			struct tcphdr		 th;
4760 			u_int32_t		 seq;
4761 			struct pf_state_peer	*src, *dst;
4762 			u_int8_t		 dws;
4763 			int			 copyback = 0;
4764 
4765 			/*
4766 			 * Only the first 8 bytes of the TCP header can be
4767 			 * expected. Don't access any TCP header fields after
4768 			 * th_seq, an ackskew test is not possible.
4769 			 */
4770 			if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason,
4771 			    pd2.af)) {
4772 				DPFPRINTF(PF_DEBUG_MISC,
4773 				    ("pf: ICMP error message too short "
4774 				    "(tcp)\n"));
4775 				return (PF_DROP);
4776 			}
4777 
4778 			key.af = pd2.af;
4779 			key.proto = IPPROTO_TCP;
4780 			PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4781 			PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4782 			key.port[pd2.sidx] = th.th_sport;
4783 			key.port[pd2.didx] = th.th_dport;
4784 
4785 			STATE_LOOKUP(kif, &key, direction, *state, pd);
4786 
4787 			if (direction == (*state)->direction) {
4788 				src = &(*state)->dst;
4789 				dst = &(*state)->src;
4790 			} else {
4791 				src = &(*state)->src;
4792 				dst = &(*state)->dst;
4793 			}
4794 
4795 			if (src->wscale && dst->wscale)
4796 				dws = dst->wscale & PF_WSCALE_MASK;
4797 			else
4798 				dws = 0;
4799 
4800 			/* Demodulate sequence number */
4801 			seq = ntohl(th.th_seq) - src->seqdiff;
4802 			if (src->seqdiff) {
4803 				pf_change_a(&th.th_seq, icmpsum,
4804 				    htonl(seq), 0);
4805 				copyback = 1;
4806 			}
4807 
4808 			if (!((*state)->state_flags & PFSTATE_SLOPPY) &&
4809 			    (!SEQ_GEQ(src->seqhi, seq) ||
4810 			    !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) {
4811 				if (V_pf_status.debug >= PF_DEBUG_MISC) {
4812 					printf("pf: BAD ICMP %d:%d ",
4813 					    icmptype, pd->hdr.icmp->icmp_code);
4814 					pf_print_host(pd->src, 0, pd->af);
4815 					printf(" -> ");
4816 					pf_print_host(pd->dst, 0, pd->af);
4817 					printf(" state: ");
4818 					pf_print_state(*state);
4819 					printf(" seq=%u\n", seq);
4820 				}
4821 				REASON_SET(reason, PFRES_BADSTATE);
4822 				return (PF_DROP);
4823 			} else {
4824 				if (V_pf_status.debug >= PF_DEBUG_MISC) {
4825 					printf("pf: OK ICMP %d:%d ",
4826 					    icmptype, pd->hdr.icmp->icmp_code);
4827 					pf_print_host(pd->src, 0, pd->af);
4828 					printf(" -> ");
4829 					pf_print_host(pd->dst, 0, pd->af);
4830 					printf(" state: ");
4831 					pf_print_state(*state);
4832 					printf(" seq=%u\n", seq);
4833 				}
4834 			}
4835 
4836 			/* translate source/destination address, if necessary */
4837 			if ((*state)->key[PF_SK_WIRE] !=
4838 			    (*state)->key[PF_SK_STACK]) {
4839 				struct pf_state_key *nk =
4840 				    (*state)->key[pd->didx];
4841 
4842 				if (PF_ANEQ(pd2.src,
4843 				    &nk->addr[pd2.sidx], pd2.af) ||
4844 				    nk->port[pd2.sidx] != th.th_sport)
4845 					pf_change_icmp(pd2.src, &th.th_sport,
4846 					    daddr, &nk->addr[pd2.sidx],
4847 					    nk->port[pd2.sidx], NULL,
4848 					    pd2.ip_sum, icmpsum,
4849 					    pd->ip_sum, 0, pd2.af);
4850 
4851 				if (PF_ANEQ(pd2.dst,
4852 				    &nk->addr[pd2.didx], pd2.af) ||
4853 				    nk->port[pd2.didx] != th.th_dport)
4854 					pf_change_icmp(pd2.dst, &th.th_dport,
4855 					    saddr, &nk->addr[pd2.didx],
4856 					    nk->port[pd2.didx], NULL,
4857 					    pd2.ip_sum, icmpsum,
4858 					    pd->ip_sum, 0, pd2.af);
4859 				copyback = 1;
4860 			}
4861 
4862 			if (copyback) {
4863 				switch (pd2.af) {
4864 #ifdef INET
4865 				case AF_INET:
4866 					m_copyback(m, off, ICMP_MINLEN,
4867 					    (caddr_t )pd->hdr.icmp);
4868 					m_copyback(m, ipoff2, sizeof(h2),
4869 					    (caddr_t )&h2);
4870 					break;
4871 #endif /* INET */
4872 #ifdef INET6
4873 				case AF_INET6:
4874 					m_copyback(m, off,
4875 					    sizeof(struct icmp6_hdr),
4876 					    (caddr_t )pd->hdr.icmp6);
4877 					m_copyback(m, ipoff2, sizeof(h2_6),
4878 					    (caddr_t )&h2_6);
4879 					break;
4880 #endif /* INET6 */
4881 				}
4882 				m_copyback(m, off2, 8, (caddr_t)&th);
4883 			}
4884 
4885 			return (PF_PASS);
4886 			break;
4887 		}
4888 		case IPPROTO_UDP: {
4889 			struct udphdr		uh;
4890 
4891 			if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
4892 			    NULL, reason, pd2.af)) {
4893 				DPFPRINTF(PF_DEBUG_MISC,
4894 				    ("pf: ICMP error message too short "
4895 				    "(udp)\n"));
4896 				return (PF_DROP);
4897 			}
4898 
4899 			key.af = pd2.af;
4900 			key.proto = IPPROTO_UDP;
4901 			PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4902 			PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4903 			key.port[pd2.sidx] = uh.uh_sport;
4904 			key.port[pd2.didx] = uh.uh_dport;
4905 
4906 			STATE_LOOKUP(kif, &key, direction, *state, pd);
4907 
4908 			/* translate source/destination address, if necessary */
4909 			if ((*state)->key[PF_SK_WIRE] !=
4910 			    (*state)->key[PF_SK_STACK]) {
4911 				struct pf_state_key *nk =
4912 				    (*state)->key[pd->didx];
4913 
4914 				if (PF_ANEQ(pd2.src,
4915 				    &nk->addr[pd2.sidx], pd2.af) ||
4916 				    nk->port[pd2.sidx] != uh.uh_sport)
4917 					pf_change_icmp(pd2.src, &uh.uh_sport,
4918 					    daddr, &nk->addr[pd2.sidx],
4919 					    nk->port[pd2.sidx], &uh.uh_sum,
4920 					    pd2.ip_sum, icmpsum,
4921 					    pd->ip_sum, 1, pd2.af);
4922 
4923 				if (PF_ANEQ(pd2.dst,
4924 				    &nk->addr[pd2.didx], pd2.af) ||
4925 				    nk->port[pd2.didx] != uh.uh_dport)
4926 					pf_change_icmp(pd2.dst, &uh.uh_dport,
4927 					    saddr, &nk->addr[pd2.didx],
4928 					    nk->port[pd2.didx], &uh.uh_sum,
4929 					    pd2.ip_sum, icmpsum,
4930 					    pd->ip_sum, 1, pd2.af);
4931 
4932 				switch (pd2.af) {
4933 #ifdef INET
4934 				case AF_INET:
4935 					m_copyback(m, off, ICMP_MINLEN,
4936 					    (caddr_t )pd->hdr.icmp);
4937 					m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4938 					break;
4939 #endif /* INET */
4940 #ifdef INET6
4941 				case AF_INET6:
4942 					m_copyback(m, off,
4943 					    sizeof(struct icmp6_hdr),
4944 					    (caddr_t )pd->hdr.icmp6);
4945 					m_copyback(m, ipoff2, sizeof(h2_6),
4946 					    (caddr_t )&h2_6);
4947 					break;
4948 #endif /* INET6 */
4949 				}
4950 				m_copyback(m, off2, sizeof(uh), (caddr_t)&uh);
4951 			}
4952 			return (PF_PASS);
4953 			break;
4954 		}
4955 #ifdef INET
4956 		case IPPROTO_ICMP: {
4957 			struct icmp		iih;
4958 
4959 			if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
4960 			    NULL, reason, pd2.af)) {
4961 				DPFPRINTF(PF_DEBUG_MISC,
4962 				    ("pf: ICMP error message too short i"
4963 				    "(icmp)\n"));
4964 				return (PF_DROP);
4965 			}
4966 
4967 			key.af = pd2.af;
4968 			key.proto = IPPROTO_ICMP;
4969 			PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4970 			PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4971 			key.port[0] = key.port[1] = iih.icmp_id;
4972 
4973 			STATE_LOOKUP(kif, &key, direction, *state, pd);
4974 
4975 			/* translate source/destination address, if necessary */
4976 			if ((*state)->key[PF_SK_WIRE] !=
4977 			    (*state)->key[PF_SK_STACK]) {
4978 				struct pf_state_key *nk =
4979 				    (*state)->key[pd->didx];
4980 
4981 				if (PF_ANEQ(pd2.src,
4982 				    &nk->addr[pd2.sidx], pd2.af) ||
4983 				    nk->port[pd2.sidx] != iih.icmp_id)
4984 					pf_change_icmp(pd2.src, &iih.icmp_id,
4985 					    daddr, &nk->addr[pd2.sidx],
4986 					    nk->port[pd2.sidx], NULL,
4987 					    pd2.ip_sum, icmpsum,
4988 					    pd->ip_sum, 0, AF_INET);
4989 
4990 				if (PF_ANEQ(pd2.dst,
4991 				    &nk->addr[pd2.didx], pd2.af) ||
4992 				    nk->port[pd2.didx] != iih.icmp_id)
4993 					pf_change_icmp(pd2.dst, &iih.icmp_id,
4994 					    saddr, &nk->addr[pd2.didx],
4995 					    nk->port[pd2.didx], NULL,
4996 					    pd2.ip_sum, icmpsum,
4997 					    pd->ip_sum, 0, AF_INET);
4998 
4999 				m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
5000 				m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5001 				m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih);
5002 			}
5003 			return (PF_PASS);
5004 			break;
5005 		}
5006 #endif /* INET */
5007 #ifdef INET6
5008 		case IPPROTO_ICMPV6: {
5009 			struct icmp6_hdr	iih;
5010 
5011 			if (!pf_pull_hdr(m, off2, &iih,
5012 			    sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) {
5013 				DPFPRINTF(PF_DEBUG_MISC,
5014 				    ("pf: ICMP error message too short "
5015 				    "(icmp6)\n"));
5016 				return (PF_DROP);
5017 			}
5018 
5019 			key.af = pd2.af;
5020 			key.proto = IPPROTO_ICMPV6;
5021 			PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5022 			PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5023 			key.port[0] = key.port[1] = iih.icmp6_id;
5024 
5025 			STATE_LOOKUP(kif, &key, direction, *state, pd);
5026 
5027 			/* translate source/destination address, if necessary */
5028 			if ((*state)->key[PF_SK_WIRE] !=
5029 			    (*state)->key[PF_SK_STACK]) {
5030 				struct pf_state_key *nk =
5031 				    (*state)->key[pd->didx];
5032 
5033 				if (PF_ANEQ(pd2.src,
5034 				    &nk->addr[pd2.sidx], pd2.af) ||
5035 				    nk->port[pd2.sidx] != iih.icmp6_id)
5036 					pf_change_icmp(pd2.src, &iih.icmp6_id,
5037 					    daddr, &nk->addr[pd2.sidx],
5038 					    nk->port[pd2.sidx], NULL,
5039 					    pd2.ip_sum, icmpsum,
5040 					    pd->ip_sum, 0, AF_INET6);
5041 
5042 				if (PF_ANEQ(pd2.dst,
5043 				    &nk->addr[pd2.didx], pd2.af) ||
5044 				    nk->port[pd2.didx] != iih.icmp6_id)
5045 					pf_change_icmp(pd2.dst, &iih.icmp6_id,
5046 					    saddr, &nk->addr[pd2.didx],
5047 					    nk->port[pd2.didx], NULL,
5048 					    pd2.ip_sum, icmpsum,
5049 					    pd->ip_sum, 0, AF_INET6);
5050 
5051 				m_copyback(m, off, sizeof(struct icmp6_hdr),
5052 				    (caddr_t)pd->hdr.icmp6);
5053 				m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6);
5054 				m_copyback(m, off2, sizeof(struct icmp6_hdr),
5055 				    (caddr_t)&iih);
5056 			}
5057 			return (PF_PASS);
5058 			break;
5059 		}
5060 #endif /* INET6 */
5061 		default: {
5062 			key.af = pd2.af;
5063 			key.proto = pd2.proto;
5064 			PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5065 			PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5066 			key.port[0] = key.port[1] = 0;
5067 
5068 			STATE_LOOKUP(kif, &key, direction, *state, pd);
5069 
5070 			/* translate source/destination address, if necessary */
5071 			if ((*state)->key[PF_SK_WIRE] !=
5072 			    (*state)->key[PF_SK_STACK]) {
5073 				struct pf_state_key *nk =
5074 				    (*state)->key[pd->didx];
5075 
5076 				if (PF_ANEQ(pd2.src,
5077 				    &nk->addr[pd2.sidx], pd2.af))
5078 					pf_change_icmp(pd2.src, NULL, daddr,
5079 					    &nk->addr[pd2.sidx], 0, NULL,
5080 					    pd2.ip_sum, icmpsum,
5081 					    pd->ip_sum, 0, pd2.af);
5082 
5083 				if (PF_ANEQ(pd2.dst,
5084 				    &nk->addr[pd2.didx], pd2.af))
5085 					pf_change_icmp(pd2.dst, NULL, saddr,
5086 					    &nk->addr[pd2.didx], 0, NULL,
5087 					    pd2.ip_sum, icmpsum,
5088 					    pd->ip_sum, 0, pd2.af);
5089 
5090 				switch (pd2.af) {
5091 #ifdef INET
5092 				case AF_INET:
5093 					m_copyback(m, off, ICMP_MINLEN,
5094 					    (caddr_t)pd->hdr.icmp);
5095 					m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5096 					break;
5097 #endif /* INET */
5098 #ifdef INET6
5099 				case AF_INET6:
5100 					m_copyback(m, off,
5101 					    sizeof(struct icmp6_hdr),
5102 					    (caddr_t )pd->hdr.icmp6);
5103 					m_copyback(m, ipoff2, sizeof(h2_6),
5104 					    (caddr_t )&h2_6);
5105 					break;
5106 #endif /* INET6 */
5107 				}
5108 			}
5109 			return (PF_PASS);
5110 			break;
5111 		}
5112 		}
5113 	}
5114 }
5115 
5116 static int
5117 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
5118     struct mbuf *m, struct pf_pdesc *pd)
5119 {
5120 	struct pf_state_peer	*src, *dst;
5121 	struct pf_state_key_cmp	 key;
5122 
5123 	bzero(&key, sizeof(key));
5124 	key.af = pd->af;
5125 	key.proto = pd->proto;
5126 	if (direction == PF_IN)	{
5127 		PF_ACPY(&key.addr[0], pd->src, key.af);
5128 		PF_ACPY(&key.addr[1], pd->dst, key.af);
5129 		key.port[0] = key.port[1] = 0;
5130 	} else {
5131 		PF_ACPY(&key.addr[1], pd->src, key.af);
5132 		PF_ACPY(&key.addr[0], pd->dst, key.af);
5133 		key.port[1] = key.port[0] = 0;
5134 	}
5135 
5136 	STATE_LOOKUP(kif, &key, direction, *state, pd);
5137 
5138 	if (direction == (*state)->direction) {
5139 		src = &(*state)->src;
5140 		dst = &(*state)->dst;
5141 	} else {
5142 		src = &(*state)->dst;
5143 		dst = &(*state)->src;
5144 	}
5145 
5146 	/* update states */
5147 	if (src->state < PFOTHERS_SINGLE)
5148 		src->state = PFOTHERS_SINGLE;
5149 	if (dst->state == PFOTHERS_SINGLE)
5150 		dst->state = PFOTHERS_MULTIPLE;
5151 
5152 	/* update expire time */
5153 	(*state)->expire = time_uptime;
5154 	if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
5155 		(*state)->timeout = PFTM_OTHER_MULTIPLE;
5156 	else
5157 		(*state)->timeout = PFTM_OTHER_SINGLE;
5158 
5159 	/* translate source/destination address, if necessary */
5160 	if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
5161 		struct pf_state_key *nk = (*state)->key[pd->didx];
5162 
5163 		KASSERT(nk, ("%s: nk is null", __func__));
5164 		KASSERT(pd, ("%s: pd is null", __func__));
5165 		KASSERT(pd->src, ("%s: pd->src is null", __func__));
5166 		KASSERT(pd->dst, ("%s: pd->dst is null", __func__));
5167 		switch (pd->af) {
5168 #ifdef INET
5169 		case AF_INET:
5170 			if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
5171 				pf_change_a(&pd->src->v4.s_addr,
5172 				    pd->ip_sum,
5173 				    nk->addr[pd->sidx].v4.s_addr,
5174 				    0);
5175 
5176 
5177 			if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5178 				pf_change_a(&pd->dst->v4.s_addr,
5179 				    pd->ip_sum,
5180 				    nk->addr[pd->didx].v4.s_addr,
5181 				    0);
5182 
5183 				break;
5184 #endif /* INET */
5185 #ifdef INET6
5186 		case AF_INET6:
5187 			if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
5188 				PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af);
5189 
5190 			if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5191 				PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af);
5192 #endif /* INET6 */
5193 		}
5194 	}
5195 	return (PF_PASS);
5196 }
5197 
5198 /*
5199  * ipoff and off are measured from the start of the mbuf chain.
5200  * h must be at "ipoff" on the mbuf chain.
5201  */
5202 void *
5203 pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
5204     u_short *actionp, u_short *reasonp, sa_family_t af)
5205 {
5206 	switch (af) {
5207 #ifdef INET
5208 	case AF_INET: {
5209 		struct ip	*h = mtod(m, struct ip *);
5210 		u_int16_t	 fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3;
5211 
5212 		if (fragoff) {
5213 			if (fragoff >= len)
5214 				ACTION_SET(actionp, PF_PASS);
5215 			else {
5216 				ACTION_SET(actionp, PF_DROP);
5217 				REASON_SET(reasonp, PFRES_FRAG);
5218 			}
5219 			return (NULL);
5220 		}
5221 		if (m->m_pkthdr.len < off + len ||
5222 		    ntohs(h->ip_len) < off + len) {
5223 			ACTION_SET(actionp, PF_DROP);
5224 			REASON_SET(reasonp, PFRES_SHORT);
5225 			return (NULL);
5226 		}
5227 		break;
5228 	}
5229 #endif /* INET */
5230 #ifdef INET6
5231 	case AF_INET6: {
5232 		struct ip6_hdr	*h = mtod(m, struct ip6_hdr *);
5233 
5234 		if (m->m_pkthdr.len < off + len ||
5235 		    (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
5236 		    (unsigned)(off + len)) {
5237 			ACTION_SET(actionp, PF_DROP);
5238 			REASON_SET(reasonp, PFRES_SHORT);
5239 			return (NULL);
5240 		}
5241 		break;
5242 	}
5243 #endif /* INET6 */
5244 	}
5245 	m_copydata(m, off, len, p);
5246 	return (p);
5247 }
5248 
5249 #ifdef RADIX_MPATH
5250 static int
5251 pf_routable_oldmpath(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif,
5252     int rtableid)
5253 {
5254 	struct radix_node_head	*rnh;
5255 	struct sockaddr_in	*dst;
5256 	int			 ret = 1;
5257 	int			 check_mpath;
5258 #ifdef INET6
5259 	struct sockaddr_in6	*dst6;
5260 	struct route_in6	 ro;
5261 #else
5262 	struct route		 ro;
5263 #endif
5264 	struct radix_node	*rn;
5265 	struct rtentry		*rt;
5266 	struct ifnet		*ifp;
5267 
5268 	check_mpath = 0;
5269 	/* XXX: stick to table 0 for now */
5270 	rnh = rt_tables_get_rnh(0, af);
5271 	if (rnh != NULL && rn_mpath_capable(rnh))
5272 		check_mpath = 1;
5273 	bzero(&ro, sizeof(ro));
5274 	switch (af) {
5275 	case AF_INET:
5276 		dst = satosin(&ro.ro_dst);
5277 		dst->sin_family = AF_INET;
5278 		dst->sin_len = sizeof(*dst);
5279 		dst->sin_addr = addr->v4;
5280 		break;
5281 #ifdef INET6
5282 	case AF_INET6:
5283 		/*
5284 		 * Skip check for addresses with embedded interface scope,
5285 		 * as they would always match anyway.
5286 		 */
5287 		if (IN6_IS_SCOPE_EMBED(&addr->v6))
5288 			goto out;
5289 		dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
5290 		dst6->sin6_family = AF_INET6;
5291 		dst6->sin6_len = sizeof(*dst6);
5292 		dst6->sin6_addr = addr->v6;
5293 		break;
5294 #endif /* INET6 */
5295 	default:
5296 		return (0);
5297 	}
5298 
5299 	/* Skip checks for ipsec interfaces */
5300 	if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
5301 		goto out;
5302 
5303 	switch (af) {
5304 #ifdef INET6
5305 	case AF_INET6:
5306 		in6_rtalloc_ign(&ro, 0, rtableid);
5307 		break;
5308 #endif
5309 #ifdef INET
5310 	case AF_INET:
5311 		in_rtalloc_ign((struct route *)&ro, 0, rtableid);
5312 		break;
5313 #endif
5314 	}
5315 
5316 	if (ro.ro_rt != NULL) {
5317 		/* No interface given, this is a no-route check */
5318 		if (kif == NULL)
5319 			goto out;
5320 
5321 		if (kif->pfik_ifp == NULL) {
5322 			ret = 0;
5323 			goto out;
5324 		}
5325 
5326 		/* Perform uRPF check if passed input interface */
5327 		ret = 0;
5328 		rn = (struct radix_node *)ro.ro_rt;
5329 		do {
5330 			rt = (struct rtentry *)rn;
5331 			ifp = rt->rt_ifp;
5332 
5333 			if (kif->pfik_ifp == ifp)
5334 				ret = 1;
5335 			rn = rn_mpath_next(rn);
5336 		} while (check_mpath == 1 && rn != NULL && ret == 0);
5337 	} else
5338 		ret = 0;
5339 out:
5340 	if (ro.ro_rt != NULL)
5341 		RTFREE(ro.ro_rt);
5342 	return (ret);
5343 }
5344 #endif
5345 
5346 int
5347 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif,
5348     int rtableid)
5349 {
5350 #ifdef INET
5351 	struct nhop4_basic	nh4;
5352 #endif
5353 #ifdef INET6
5354 	struct nhop6_basic	nh6;
5355 #endif
5356 	struct ifnet		*ifp;
5357 #ifdef RADIX_MPATH
5358 	struct radix_node_head	*rnh;
5359 
5360 	/* XXX: stick to table 0 for now */
5361 	rnh = rt_tables_get_rnh(0, af);
5362 	if (rnh != NULL && rn_mpath_capable(rnh))
5363 		return (pf_routable_oldmpath(addr, af, kif, rtableid));
5364 #endif
5365 	/*
5366 	 * Skip check for addresses with embedded interface scope,
5367 	 * as they would always match anyway.
5368 	 */
5369 	if (af == AF_INET6 && IN6_IS_SCOPE_EMBED(&addr->v6))
5370 		return (1);
5371 
5372 	if (af != AF_INET && af != AF_INET6)
5373 		return (0);
5374 
5375 	/* Skip checks for ipsec interfaces */
5376 	if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
5377 		return (1);
5378 
5379 	ifp = NULL;
5380 
5381 	switch (af) {
5382 #ifdef INET6
5383 	case AF_INET6:
5384 		if (fib6_lookup_nh_basic(rtableid, &addr->v6, 0, 0, 0, &nh6)!=0)
5385 			return (0);
5386 		ifp = nh6.nh_ifp;
5387 		break;
5388 #endif
5389 #ifdef INET
5390 	case AF_INET:
5391 		if (fib4_lookup_nh_basic(rtableid, addr->v4, 0, 0, &nh4) != 0)
5392 			return (0);
5393 		ifp = nh4.nh_ifp;
5394 		break;
5395 #endif
5396 	}
5397 
5398 	/* No interface given, this is a no-route check */
5399 	if (kif == NULL)
5400 		return (1);
5401 
5402 	if (kif->pfik_ifp == NULL)
5403 		return (0);
5404 
5405 	/* Perform uRPF check if passed input interface */
5406 	if (kif->pfik_ifp == ifp)
5407 		return (1);
5408 	return (0);
5409 }
5410 
5411 #ifdef INET
5412 static void
5413 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5414     struct pf_state *s, struct pf_pdesc *pd)
5415 {
5416 	struct mbuf		*m0, *m1;
5417 	struct sockaddr_in	dst;
5418 	struct ip		*ip;
5419 	struct ifnet		*ifp = NULL;
5420 	struct pf_addr		 naddr;
5421 	struct pf_src_node	*sn = NULL;
5422 	int			 error = 0;
5423 	uint16_t		 ip_len, ip_off;
5424 
5425 	KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__));
5426 	KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction",
5427 	    __func__));
5428 
5429 	if ((pd->pf_mtag == NULL &&
5430 	    ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) ||
5431 	    pd->pf_mtag->routed++ > 3) {
5432 		m0 = *m;
5433 		*m = NULL;
5434 		goto bad_locked;
5435 	}
5436 
5437 	if (r->rt == PF_DUPTO) {
5438 		if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) {
5439 			if (s)
5440 				PF_STATE_UNLOCK(s);
5441 			return;
5442 		}
5443 	} else {
5444 		if ((r->rt == PF_REPLYTO) == (r->direction == dir)) {
5445 			if (s)
5446 				PF_STATE_UNLOCK(s);
5447 			return;
5448 		}
5449 		m0 = *m;
5450 	}
5451 
5452 	ip = mtod(m0, struct ip *);
5453 
5454 	bzero(&dst, sizeof(dst));
5455 	dst.sin_family = AF_INET;
5456 	dst.sin_len = sizeof(dst);
5457 	dst.sin_addr = ip->ip_dst;
5458 
5459 	if (TAILQ_EMPTY(&r->rpool.list)) {
5460 		DPFPRINTF(PF_DEBUG_URGENT,
5461 		    ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__));
5462 		goto bad_locked;
5463 	}
5464 	if (s == NULL) {
5465 		pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
5466 		    &naddr, NULL, &sn);
5467 		if (!PF_AZERO(&naddr, AF_INET))
5468 			dst.sin_addr.s_addr = naddr.v4.s_addr;
5469 		ifp = r->rpool.cur->kif ?
5470 		    r->rpool.cur->kif->pfik_ifp : NULL;
5471 	} else {
5472 		if (!PF_AZERO(&s->rt_addr, AF_INET))
5473 			dst.sin_addr.s_addr =
5474 			    s->rt_addr.v4.s_addr;
5475 		ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5476 		PF_STATE_UNLOCK(s);
5477 	}
5478 	if (ifp == NULL)
5479 		goto bad;
5480 
5481 	if (oifp != ifp) {
5482 		if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS)
5483 			goto bad;
5484 		else if (m0 == NULL)
5485 			goto done;
5486 		if (m0->m_len < sizeof(struct ip)) {
5487 			DPFPRINTF(PF_DEBUG_URGENT,
5488 			    ("%s: m0->m_len < sizeof(struct ip)\n", __func__));
5489 			goto bad;
5490 		}
5491 		ip = mtod(m0, struct ip *);
5492 	}
5493 
5494 	if (ifp->if_flags & IFF_LOOPBACK)
5495 		m0->m_flags |= M_SKIP_FIREWALL;
5496 
5497 	ip_len = ntohs(ip->ip_len);
5498 	ip_off = ntohs(ip->ip_off);
5499 
5500 	/* Copied from FreeBSD 10.0-CURRENT ip_output. */
5501 	m0->m_pkthdr.csum_flags |= CSUM_IP;
5502 	if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) {
5503 		in_delayed_cksum(m0);
5504 		m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
5505 	}
5506 #ifdef SCTP
5507 	if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) {
5508 		sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
5509 		m0->m_pkthdr.csum_flags &= ~CSUM_SCTP;
5510 	}
5511 #endif
5512 
5513 	/*
5514 	 * If small enough for interface, or the interface will take
5515 	 * care of the fragmentation for us, we can just send directly.
5516 	 */
5517 	if (ip_len <= ifp->if_mtu ||
5518 	    (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) {
5519 		ip->ip_sum = 0;
5520 		if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) {
5521 			ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
5522 			m0->m_pkthdr.csum_flags &= ~CSUM_IP;
5523 		}
5524 		m_clrprotoflags(m0);	/* Avoid confusing lower layers. */
5525 		error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL);
5526 		goto done;
5527 	}
5528 
5529 	/* Balk when DF bit is set or the interface didn't support TSO. */
5530 	if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) {
5531 		error = EMSGSIZE;
5532 		KMOD_IPSTAT_INC(ips_cantfrag);
5533 		if (r->rt != PF_DUPTO) {
5534 			icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
5535 			    ifp->if_mtu);
5536 			goto done;
5537 		} else
5538 			goto bad;
5539 	}
5540 
5541 	error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist);
5542 	if (error)
5543 		goto bad;
5544 
5545 	for (; m0; m0 = m1) {
5546 		m1 = m0->m_nextpkt;
5547 		m0->m_nextpkt = NULL;
5548 		if (error == 0) {
5549 			m_clrprotoflags(m0);
5550 			error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL);
5551 		} else
5552 			m_freem(m0);
5553 	}
5554 
5555 	if (error == 0)
5556 		KMOD_IPSTAT_INC(ips_fragmented);
5557 
5558 done:
5559 	if (r->rt != PF_DUPTO)
5560 		*m = NULL;
5561 	return;
5562 
5563 bad_locked:
5564 	if (s)
5565 		PF_STATE_UNLOCK(s);
5566 bad:
5567 	m_freem(m0);
5568 	goto done;
5569 }
5570 #endif /* INET */
5571 
5572 #ifdef INET6
5573 static void
5574 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5575     struct pf_state *s, struct pf_pdesc *pd)
5576 {
5577 	struct mbuf		*m0;
5578 	struct sockaddr_in6	dst;
5579 	struct ip6_hdr		*ip6;
5580 	struct ifnet		*ifp = NULL;
5581 	struct pf_addr		 naddr;
5582 	struct pf_src_node	*sn = NULL;
5583 
5584 	KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__));
5585 	KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction",
5586 	    __func__));
5587 
5588 	if ((pd->pf_mtag == NULL &&
5589 	    ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) ||
5590 	    pd->pf_mtag->routed++ > 3) {
5591 		m0 = *m;
5592 		*m = NULL;
5593 		goto bad_locked;
5594 	}
5595 
5596 	if (r->rt == PF_DUPTO) {
5597 		if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) {
5598 			if (s)
5599 				PF_STATE_UNLOCK(s);
5600 			return;
5601 		}
5602 	} else {
5603 		if ((r->rt == PF_REPLYTO) == (r->direction == dir)) {
5604 			if (s)
5605 				PF_STATE_UNLOCK(s);
5606 			return;
5607 		}
5608 		m0 = *m;
5609 	}
5610 
5611 	ip6 = mtod(m0, struct ip6_hdr *);
5612 
5613 	bzero(&dst, sizeof(dst));
5614 	dst.sin6_family = AF_INET6;
5615 	dst.sin6_len = sizeof(dst);
5616 	dst.sin6_addr = ip6->ip6_dst;
5617 
5618 	if (TAILQ_EMPTY(&r->rpool.list)) {
5619 		DPFPRINTF(PF_DEBUG_URGENT,
5620 		    ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__));
5621 		goto bad_locked;
5622 	}
5623 	if (s == NULL) {
5624 		pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
5625 		    &naddr, NULL, &sn);
5626 		if (!PF_AZERO(&naddr, AF_INET6))
5627 			PF_ACPY((struct pf_addr *)&dst.sin6_addr,
5628 			    &naddr, AF_INET6);
5629 		ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
5630 	} else {
5631 		if (!PF_AZERO(&s->rt_addr, AF_INET6))
5632 			PF_ACPY((struct pf_addr *)&dst.sin6_addr,
5633 			    &s->rt_addr, AF_INET6);
5634 		ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5635 	}
5636 
5637 	if (s)
5638 		PF_STATE_UNLOCK(s);
5639 
5640 	if (ifp == NULL)
5641 		goto bad;
5642 
5643 	if (oifp != ifp) {
5644 		if (pf_test6(PF_FWD, ifp, &m0, NULL) != PF_PASS)
5645 			goto bad;
5646 		else if (m0 == NULL)
5647 			goto done;
5648 		if (m0->m_len < sizeof(struct ip6_hdr)) {
5649 			DPFPRINTF(PF_DEBUG_URGENT,
5650 			    ("%s: m0->m_len < sizeof(struct ip6_hdr)\n",
5651 			    __func__));
5652 			goto bad;
5653 		}
5654 		ip6 = mtod(m0, struct ip6_hdr *);
5655 	}
5656 
5657 	if (ifp->if_flags & IFF_LOOPBACK)
5658 		m0->m_flags |= M_SKIP_FIREWALL;
5659 
5660 	if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6 &
5661 	    ~ifp->if_hwassist) {
5662 		uint32_t plen = m0->m_pkthdr.len - sizeof(*ip6);
5663 		in6_delayed_cksum(m0, plen, sizeof(struct ip6_hdr));
5664 		m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
5665 	}
5666 
5667 	/*
5668 	 * If the packet is too large for the outgoing interface,
5669 	 * send back an icmp6 error.
5670 	 */
5671 	if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr))
5672 		dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
5673 	if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu)
5674 		nd6_output_ifp(ifp, ifp, m0, &dst, NULL);
5675 	else {
5676 		in6_ifstat_inc(ifp, ifs6_in_toobig);
5677 		if (r->rt != PF_DUPTO)
5678 			icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
5679 		else
5680 			goto bad;
5681 	}
5682 
5683 done:
5684 	if (r->rt != PF_DUPTO)
5685 		*m = NULL;
5686 	return;
5687 
5688 bad_locked:
5689 	if (s)
5690 		PF_STATE_UNLOCK(s);
5691 bad:
5692 	m_freem(m0);
5693 	goto done;
5694 }
5695 #endif /* INET6 */
5696 
5697 /*
5698  * FreeBSD supports cksum offloads for the following drivers.
5699  *  em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4),
5700  *   ti(4), txp(4), xl(4)
5701  *
5702  * CSUM_DATA_VALID | CSUM_PSEUDO_HDR :
5703  *  network driver performed cksum including pseudo header, need to verify
5704  *   csum_data
5705  * CSUM_DATA_VALID :
5706  *  network driver performed cksum, needs to additional pseudo header
5707  *  cksum computation with partial csum_data(i.e. lack of H/W support for
5708  *  pseudo header, for instance hme(4), sk(4) and possibly gem(4))
5709  *
5710  * After validating the cksum of packet, set both flag CSUM_DATA_VALID and
5711  * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper
5712  * TCP/UDP layer.
5713  * Also, set csum_data to 0xffff to force cksum validation.
5714  */
5715 static int
5716 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af)
5717 {
5718 	u_int16_t sum = 0;
5719 	int hw_assist = 0;
5720 	struct ip *ip;
5721 
5722 	if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
5723 		return (1);
5724 	if (m->m_pkthdr.len < off + len)
5725 		return (1);
5726 
5727 	switch (p) {
5728 	case IPPROTO_TCP:
5729 		if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5730 			if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5731 				sum = m->m_pkthdr.csum_data;
5732 			} else {
5733 				ip = mtod(m, struct ip *);
5734 				sum = in_pseudo(ip->ip_src.s_addr,
5735 				ip->ip_dst.s_addr, htonl((u_short)len +
5736 				m->m_pkthdr.csum_data + IPPROTO_TCP));
5737 			}
5738 			sum ^= 0xffff;
5739 			++hw_assist;
5740 		}
5741 		break;
5742 	case IPPROTO_UDP:
5743 		if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5744 			if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5745 				sum = m->m_pkthdr.csum_data;
5746 			} else {
5747 				ip = mtod(m, struct ip *);
5748 				sum = in_pseudo(ip->ip_src.s_addr,
5749 				ip->ip_dst.s_addr, htonl((u_short)len +
5750 				m->m_pkthdr.csum_data + IPPROTO_UDP));
5751 			}
5752 			sum ^= 0xffff;
5753 			++hw_assist;
5754 		}
5755 		break;
5756 	case IPPROTO_ICMP:
5757 #ifdef INET6
5758 	case IPPROTO_ICMPV6:
5759 #endif /* INET6 */
5760 		break;
5761 	default:
5762 		return (1);
5763 	}
5764 
5765 	if (!hw_assist) {
5766 		switch (af) {
5767 		case AF_INET:
5768 			if (p == IPPROTO_ICMP) {
5769 				if (m->m_len < off)
5770 					return (1);
5771 				m->m_data += off;
5772 				m->m_len -= off;
5773 				sum = in_cksum(m, len);
5774 				m->m_data -= off;
5775 				m->m_len += off;
5776 			} else {
5777 				if (m->m_len < sizeof(struct ip))
5778 					return (1);
5779 				sum = in4_cksum(m, p, off, len);
5780 			}
5781 			break;
5782 #ifdef INET6
5783 		case AF_INET6:
5784 			if (m->m_len < sizeof(struct ip6_hdr))
5785 				return (1);
5786 			sum = in6_cksum(m, p, off, len);
5787 			break;
5788 #endif /* INET6 */
5789 		default:
5790 			return (1);
5791 		}
5792 	}
5793 	if (sum) {
5794 		switch (p) {
5795 		case IPPROTO_TCP:
5796 		    {
5797 			KMOD_TCPSTAT_INC(tcps_rcvbadsum);
5798 			break;
5799 		    }
5800 		case IPPROTO_UDP:
5801 		    {
5802 			KMOD_UDPSTAT_INC(udps_badsum);
5803 			break;
5804 		    }
5805 #ifdef INET
5806 		case IPPROTO_ICMP:
5807 		    {
5808 			KMOD_ICMPSTAT_INC(icps_checksum);
5809 			break;
5810 		    }
5811 #endif
5812 #ifdef INET6
5813 		case IPPROTO_ICMPV6:
5814 		    {
5815 			KMOD_ICMP6STAT_INC(icp6s_checksum);
5816 			break;
5817 		    }
5818 #endif /* INET6 */
5819 		}
5820 		return (1);
5821 	} else {
5822 		if (p == IPPROTO_TCP || p == IPPROTO_UDP) {
5823 			m->m_pkthdr.csum_flags |=
5824 			    (CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
5825 			m->m_pkthdr.csum_data = 0xffff;
5826 		}
5827 	}
5828 	return (0);
5829 }
5830 
5831 
5832 #ifdef INET
5833 int
5834 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp)
5835 {
5836 	struct pfi_kif		*kif;
5837 	u_short			 action, reason = 0, log = 0;
5838 	struct mbuf		*m = *m0;
5839 	struct ip		*h = NULL;
5840 	struct m_tag		*ipfwtag;
5841 	struct pf_rule		*a = NULL, *r = &V_pf_default_rule, *tr, *nr;
5842 	struct pf_state		*s = NULL;
5843 	struct pf_ruleset	*ruleset = NULL;
5844 	struct pf_pdesc		 pd;
5845 	int			 off, dirndx, pqid = 0;
5846 
5847 	M_ASSERTPKTHDR(m);
5848 
5849 	if (!V_pf_status.running)
5850 		return (PF_PASS);
5851 
5852 	memset(&pd, 0, sizeof(pd));
5853 
5854 	kif = (struct pfi_kif *)ifp->if_pf_kif;
5855 
5856 	if (kif == NULL) {
5857 		DPFPRINTF(PF_DEBUG_URGENT,
5858 		    ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname));
5859 		return (PF_DROP);
5860 	}
5861 	if (kif->pfik_flags & PFI_IFLAG_SKIP)
5862 		return (PF_PASS);
5863 
5864 	if (m->m_flags & M_SKIP_FIREWALL)
5865 		return (PF_PASS);
5866 
5867 	pd.pf_mtag = pf_find_mtag(m);
5868 
5869 	PF_RULES_RLOCK();
5870 
5871 	if (ip_divert_ptr != NULL &&
5872 	    ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) {
5873 		struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1);
5874 		if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) {
5875 			if (pd.pf_mtag == NULL &&
5876 			    ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
5877 				action = PF_DROP;
5878 				goto done;
5879 			}
5880 			pd.pf_mtag->flags |= PF_PACKET_LOOPED;
5881 			m_tag_delete(m, ipfwtag);
5882 		}
5883 		if (pd.pf_mtag && pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) {
5884 			m->m_flags |= M_FASTFWD_OURS;
5885 			pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT;
5886 		}
5887 	} else if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) {
5888 		/* We do IP header normalization and packet reassembly here */
5889 		action = PF_DROP;
5890 		goto done;
5891 	}
5892 	m = *m0;	/* pf_normalize messes with m0 */
5893 	h = mtod(m, struct ip *);
5894 
5895 	off = h->ip_hl << 2;
5896 	if (off < (int)sizeof(struct ip)) {
5897 		action = PF_DROP;
5898 		REASON_SET(&reason, PFRES_SHORT);
5899 		log = 1;
5900 		goto done;
5901 	}
5902 
5903 	pd.src = (struct pf_addr *)&h->ip_src;
5904 	pd.dst = (struct pf_addr *)&h->ip_dst;
5905 	pd.sport = pd.dport = NULL;
5906 	pd.ip_sum = &h->ip_sum;
5907 	pd.proto_sum = NULL;
5908 	pd.proto = h->ip_p;
5909 	pd.dir = dir;
5910 	pd.sidx = (dir == PF_IN) ? 0 : 1;
5911 	pd.didx = (dir == PF_IN) ? 1 : 0;
5912 	pd.af = AF_INET;
5913 	pd.tos = h->ip_tos & ~IPTOS_ECN_MASK;
5914 	pd.tot_len = ntohs(h->ip_len);
5915 
5916 	/* handle fragments that didn't get reassembled by normalization */
5917 	if (h->ip_off & htons(IP_MF | IP_OFFMASK)) {
5918 		action = pf_test_fragment(&r, dir, kif, m, h,
5919 		    &pd, &a, &ruleset);
5920 		goto done;
5921 	}
5922 
5923 	switch (h->ip_p) {
5924 
5925 	case IPPROTO_TCP: {
5926 		struct tcphdr	th;
5927 
5928 		pd.hdr.tcp = &th;
5929 		if (!pf_pull_hdr(m, off, &th, sizeof(th),
5930 		    &action, &reason, AF_INET)) {
5931 			log = action != PF_PASS;
5932 			goto done;
5933 		}
5934 		pd.p_len = pd.tot_len - off - (th.th_off << 2);
5935 		if ((th.th_flags & TH_ACK) && pd.p_len == 0)
5936 			pqid = 1;
5937 		action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
5938 		if (action == PF_DROP)
5939 			goto done;
5940 		action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
5941 		    &reason);
5942 		if (action == PF_PASS) {
5943 			if (pfsync_update_state_ptr != NULL)
5944 				pfsync_update_state_ptr(s);
5945 			r = s->rule.ptr;
5946 			a = s->anchor.ptr;
5947 			log = s->log;
5948 		} else if (s == NULL)
5949 			action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
5950 			    &a, &ruleset, inp);
5951 		break;
5952 	}
5953 
5954 	case IPPROTO_UDP: {
5955 		struct udphdr	uh;
5956 
5957 		pd.hdr.udp = &uh;
5958 		if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
5959 		    &action, &reason, AF_INET)) {
5960 			log = action != PF_PASS;
5961 			goto done;
5962 		}
5963 		if (uh.uh_dport == 0 ||
5964 		    ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
5965 		    ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
5966 			action = PF_DROP;
5967 			REASON_SET(&reason, PFRES_SHORT);
5968 			goto done;
5969 		}
5970 		action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
5971 		if (action == PF_PASS) {
5972 			if (pfsync_update_state_ptr != NULL)
5973 				pfsync_update_state_ptr(s);
5974 			r = s->rule.ptr;
5975 			a = s->anchor.ptr;
5976 			log = s->log;
5977 		} else if (s == NULL)
5978 			action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
5979 			    &a, &ruleset, inp);
5980 		break;
5981 	}
5982 
5983 	case IPPROTO_ICMP: {
5984 		struct icmp	ih;
5985 
5986 		pd.hdr.icmp = &ih;
5987 		if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
5988 		    &action, &reason, AF_INET)) {
5989 			log = action != PF_PASS;
5990 			goto done;
5991 		}
5992 		action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd,
5993 		    &reason);
5994 		if (action == PF_PASS) {
5995 			if (pfsync_update_state_ptr != NULL)
5996 				pfsync_update_state_ptr(s);
5997 			r = s->rule.ptr;
5998 			a = s->anchor.ptr;
5999 			log = s->log;
6000 		} else if (s == NULL)
6001 			action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6002 			    &a, &ruleset, inp);
6003 		break;
6004 	}
6005 
6006 #ifdef INET6
6007 	case IPPROTO_ICMPV6: {
6008 		action = PF_DROP;
6009 		DPFPRINTF(PF_DEBUG_MISC,
6010 		    ("pf: dropping IPv4 packet with ICMPv6 payload\n"));
6011 		goto done;
6012 	}
6013 #endif
6014 
6015 	default:
6016 		action = pf_test_state_other(&s, dir, kif, m, &pd);
6017 		if (action == PF_PASS) {
6018 			if (pfsync_update_state_ptr != NULL)
6019 				pfsync_update_state_ptr(s);
6020 			r = s->rule.ptr;
6021 			a = s->anchor.ptr;
6022 			log = s->log;
6023 		} else if (s == NULL)
6024 			action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6025 			    &a, &ruleset, inp);
6026 		break;
6027 	}
6028 
6029 done:
6030 	PF_RULES_RUNLOCK();
6031 	if (action == PF_PASS && h->ip_hl > 5 &&
6032 	    !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
6033 		action = PF_DROP;
6034 		REASON_SET(&reason, PFRES_IPOPTIONS);
6035 		log = r->log;
6036 		DPFPRINTF(PF_DEBUG_MISC,
6037 		    ("pf: dropping packet with ip options\n"));
6038 	}
6039 
6040 	if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) {
6041 		action = PF_DROP;
6042 		REASON_SET(&reason, PFRES_MEMORY);
6043 	}
6044 	if (r->rtableid >= 0)
6045 		M_SETFIB(m, r->rtableid);
6046 
6047 	if (r->scrub_flags & PFSTATE_SETPRIO) {
6048 		if (pd.tos & IPTOS_LOWDELAY)
6049 			pqid = 1;
6050 		if (pf_ieee8021q_setpcp(m, r->set_prio[pqid])) {
6051 			action = PF_DROP;
6052 			REASON_SET(&reason, PFRES_MEMORY);
6053 			log = 1;
6054 			DPFPRINTF(PF_DEBUG_MISC,
6055 			    ("pf: failed to allocate 802.1q mtag\n"));
6056 		}
6057 	}
6058 
6059 #ifdef ALTQ
6060 	if (action == PF_PASS && r->qid) {
6061 		if (pd.pf_mtag == NULL &&
6062 		    ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
6063 			action = PF_DROP;
6064 			REASON_SET(&reason, PFRES_MEMORY);
6065 		} else {
6066 			if (s != NULL)
6067 				pd.pf_mtag->qid_hash = pf_state_hash(s);
6068 			if (pqid || (pd.tos & IPTOS_LOWDELAY))
6069 				pd.pf_mtag->qid = r->pqid;
6070 			else
6071 				pd.pf_mtag->qid = r->qid;
6072 			/* Add hints for ecn. */
6073 			pd.pf_mtag->hdr = h;
6074 		}
6075 
6076 	}
6077 #endif /* ALTQ */
6078 
6079 	/*
6080 	 * connections redirected to loopback should not match sockets
6081 	 * bound specifically to loopback due to security implications,
6082 	 * see tcp_input() and in_pcblookup_listen().
6083 	 */
6084 	if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
6085 	    pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
6086 	    (s->nat_rule.ptr->action == PF_RDR ||
6087 	    s->nat_rule.ptr->action == PF_BINAT) &&
6088 	    (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET)
6089 		m->m_flags |= M_SKIP_FIREWALL;
6090 
6091 	if (action == PF_PASS && r->divert.port && ip_divert_ptr != NULL &&
6092 	    !PACKET_LOOPED(&pd)) {
6093 
6094 		ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0,
6095 		    sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO);
6096 		if (ipfwtag != NULL) {
6097 			((struct ipfw_rule_ref *)(ipfwtag+1))->info =
6098 			    ntohs(r->divert.port);
6099 			((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir;
6100 
6101 			if (s)
6102 				PF_STATE_UNLOCK(s);
6103 
6104 			m_tag_prepend(m, ipfwtag);
6105 			if (m->m_flags & M_FASTFWD_OURS) {
6106 				if (pd.pf_mtag == NULL &&
6107 				    ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
6108 					action = PF_DROP;
6109 					REASON_SET(&reason, PFRES_MEMORY);
6110 					log = 1;
6111 					DPFPRINTF(PF_DEBUG_MISC,
6112 					    ("pf: failed to allocate tag\n"));
6113 				} else {
6114 					pd.pf_mtag->flags |=
6115 					    PF_FASTFWD_OURS_PRESENT;
6116 					m->m_flags &= ~M_FASTFWD_OURS;
6117 				}
6118 			}
6119 			ip_divert_ptr(*m0, dir ==  PF_IN ? DIR_IN : DIR_OUT);
6120 			*m0 = NULL;
6121 
6122 			return (action);
6123 		} else {
6124 			/* XXX: ipfw has the same behaviour! */
6125 			action = PF_DROP;
6126 			REASON_SET(&reason, PFRES_MEMORY);
6127 			log = 1;
6128 			DPFPRINTF(PF_DEBUG_MISC,
6129 			    ("pf: failed to allocate divert tag\n"));
6130 		}
6131 	}
6132 
6133 	if (log) {
6134 		struct pf_rule *lr;
6135 
6136 		if (s != NULL && s->nat_rule.ptr != NULL &&
6137 		    s->nat_rule.ptr->log & PF_LOG_ALL)
6138 			lr = s->nat_rule.ptr;
6139 		else
6140 			lr = r;
6141 		PFLOG_PACKET(kif, m, AF_INET, dir, reason, lr, a, ruleset, &pd,
6142 		    (s == NULL));
6143 	}
6144 
6145 	kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6146 	kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;
6147 
6148 	if (action == PF_PASS || r->action == PF_DROP) {
6149 		dirndx = (dir == PF_OUT);
6150 		r->packets[dirndx]++;
6151 		r->bytes[dirndx] += pd.tot_len;
6152 		if (a != NULL) {
6153 			a->packets[dirndx]++;
6154 			a->bytes[dirndx] += pd.tot_len;
6155 		}
6156 		if (s != NULL) {
6157 			if (s->nat_rule.ptr != NULL) {
6158 				s->nat_rule.ptr->packets[dirndx]++;
6159 				s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6160 			}
6161 			if (s->src_node != NULL) {
6162 				s->src_node->packets[dirndx]++;
6163 				s->src_node->bytes[dirndx] += pd.tot_len;
6164 			}
6165 			if (s->nat_src_node != NULL) {
6166 				s->nat_src_node->packets[dirndx]++;
6167 				s->nat_src_node->bytes[dirndx] += pd.tot_len;
6168 			}
6169 			dirndx = (dir == s->direction) ? 0 : 1;
6170 			s->packets[dirndx]++;
6171 			s->bytes[dirndx] += pd.tot_len;
6172 		}
6173 		tr = r;
6174 		nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6175 		if (nr != NULL && r == &V_pf_default_rule)
6176 			tr = nr;
6177 		if (tr->src.addr.type == PF_ADDR_TABLE)
6178 			pfr_update_stats(tr->src.addr.p.tbl,
6179 			    (s == NULL) ? pd.src :
6180 			    &s->key[(s->direction == PF_IN)]->
6181 				addr[(s->direction == PF_OUT)],
6182 			    pd.af, pd.tot_len, dir == PF_OUT,
6183 			    r->action == PF_PASS, tr->src.neg);
6184 		if (tr->dst.addr.type == PF_ADDR_TABLE)
6185 			pfr_update_stats(tr->dst.addr.p.tbl,
6186 			    (s == NULL) ? pd.dst :
6187 			    &s->key[(s->direction == PF_IN)]->
6188 				addr[(s->direction == PF_IN)],
6189 			    pd.af, pd.tot_len, dir == PF_OUT,
6190 			    r->action == PF_PASS, tr->dst.neg);
6191 	}
6192 
6193 	switch (action) {
6194 	case PF_SYNPROXY_DROP:
6195 		m_freem(*m0);
6196 	case PF_DEFER:
6197 		*m0 = NULL;
6198 		action = PF_PASS;
6199 		break;
6200 	case PF_DROP:
6201 		m_freem(*m0);
6202 		*m0 = NULL;
6203 		break;
6204 	default:
6205 		/* pf_route() returns unlocked. */
6206 		if (r->rt) {
6207 			pf_route(m0, r, dir, kif->pfik_ifp, s, &pd);
6208 			return (action);
6209 		}
6210 		break;
6211 	}
6212 	if (s)
6213 		PF_STATE_UNLOCK(s);
6214 
6215 	return (action);
6216 }
6217 #endif /* INET */
6218 
6219 #ifdef INET6
6220 int
6221 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp)
6222 {
6223 	struct pfi_kif		*kif;
6224 	u_short			 action, reason = 0, log = 0;
6225 	struct mbuf		*m = *m0, *n = NULL;
6226 	struct m_tag		*mtag;
6227 	struct ip6_hdr		*h = NULL;
6228 	struct pf_rule		*a = NULL, *r = &V_pf_default_rule, *tr, *nr;
6229 	struct pf_state		*s = NULL;
6230 	struct pf_ruleset	*ruleset = NULL;
6231 	struct pf_pdesc		 pd;
6232 	int			 off, terminal = 0, dirndx, rh_cnt = 0, pqid = 0;
6233 	int			 fwdir = dir;
6234 
6235 	M_ASSERTPKTHDR(m);
6236 
6237 	/* Detect packet forwarding.
6238 	 * If the input interface is different from the output interface we're
6239 	 * forwarding.
6240 	 * We do need to be careful about bridges. If the
6241 	 * net.link.bridge.pfil_bridge sysctl is set we can be filtering on a
6242 	 * bridge, so if the input interface is a bridge member and the output
6243 	 * interface is its bridge or a member of the same bridge we're not
6244 	 * actually forwarding but bridging.
6245 	 */
6246 	if (dir == PF_OUT && m->m_pkthdr.rcvif && ifp != m->m_pkthdr.rcvif &&
6247 	    (m->m_pkthdr.rcvif->if_bridge == NULL ||
6248 	    (m->m_pkthdr.rcvif->if_bridge != ifp->if_softc &&
6249 	    m->m_pkthdr.rcvif->if_bridge != ifp->if_bridge)))
6250 		fwdir = PF_FWD;
6251 
6252 	if (dir == PF_FWD)
6253 		dir = PF_OUT;
6254 
6255 	if (!V_pf_status.running)
6256 		return (PF_PASS);
6257 
6258 	memset(&pd, 0, sizeof(pd));
6259 	pd.pf_mtag = pf_find_mtag(m);
6260 
6261 	if (pd.pf_mtag && pd.pf_mtag->flags & PF_TAG_GENERATED)
6262 		return (PF_PASS);
6263 
6264 	kif = (struct pfi_kif *)ifp->if_pf_kif;
6265 	if (kif == NULL) {
6266 		DPFPRINTF(PF_DEBUG_URGENT,
6267 		    ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname));
6268 		return (PF_DROP);
6269 	}
6270 	if (kif->pfik_flags & PFI_IFLAG_SKIP)
6271 		return (PF_PASS);
6272 
6273 	if (m->m_flags & M_SKIP_FIREWALL)
6274 		return (PF_PASS);
6275 
6276 	PF_RULES_RLOCK();
6277 
6278 	/* We do IP header normalization and packet reassembly here */
6279 	if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) {
6280 		action = PF_DROP;
6281 		goto done;
6282 	}
6283 	m = *m0;	/* pf_normalize messes with m0 */
6284 	h = mtod(m, struct ip6_hdr *);
6285 
6286 #if 1
6287 	/*
6288 	 * we do not support jumbogram yet.  if we keep going, zero ip6_plen
6289 	 * will do something bad, so drop the packet for now.
6290 	 */
6291 	if (htons(h->ip6_plen) == 0) {
6292 		action = PF_DROP;
6293 		REASON_SET(&reason, PFRES_NORM);	/*XXX*/
6294 		goto done;
6295 	}
6296 #endif
6297 
6298 	pd.src = (struct pf_addr *)&h->ip6_src;
6299 	pd.dst = (struct pf_addr *)&h->ip6_dst;
6300 	pd.sport = pd.dport = NULL;
6301 	pd.ip_sum = NULL;
6302 	pd.proto_sum = NULL;
6303 	pd.dir = dir;
6304 	pd.sidx = (dir == PF_IN) ? 0 : 1;
6305 	pd.didx = (dir == PF_IN) ? 1 : 0;
6306 	pd.af = AF_INET6;
6307 	pd.tos = 0;
6308 	pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
6309 
6310 	off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
6311 	pd.proto = h->ip6_nxt;
6312 	do {
6313 		switch (pd.proto) {
6314 		case IPPROTO_FRAGMENT:
6315 			action = pf_test_fragment(&r, dir, kif, m, h,
6316 			    &pd, &a, &ruleset);
6317 			if (action == PF_DROP)
6318 				REASON_SET(&reason, PFRES_FRAG);
6319 			goto done;
6320 		case IPPROTO_ROUTING: {
6321 			struct ip6_rthdr rthdr;
6322 
6323 			if (rh_cnt++) {
6324 				DPFPRINTF(PF_DEBUG_MISC,
6325 				    ("pf: IPv6 more than one rthdr\n"));
6326 				action = PF_DROP;
6327 				REASON_SET(&reason, PFRES_IPOPTIONS);
6328 				log = 1;
6329 				goto done;
6330 			}
6331 			if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL,
6332 			    &reason, pd.af)) {
6333 				DPFPRINTF(PF_DEBUG_MISC,
6334 				    ("pf: IPv6 short rthdr\n"));
6335 				action = PF_DROP;
6336 				REASON_SET(&reason, PFRES_SHORT);
6337 				log = 1;
6338 				goto done;
6339 			}
6340 			if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) {
6341 				DPFPRINTF(PF_DEBUG_MISC,
6342 				    ("pf: IPv6 rthdr0\n"));
6343 				action = PF_DROP;
6344 				REASON_SET(&reason, PFRES_IPOPTIONS);
6345 				log = 1;
6346 				goto done;
6347 			}
6348 			/* FALLTHROUGH */
6349 		}
6350 		case IPPROTO_AH:
6351 		case IPPROTO_HOPOPTS:
6352 		case IPPROTO_DSTOPTS: {
6353 			/* get next header and header length */
6354 			struct ip6_ext	opt6;
6355 
6356 			if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
6357 			    NULL, &reason, pd.af)) {
6358 				DPFPRINTF(PF_DEBUG_MISC,
6359 				    ("pf: IPv6 short opt\n"));
6360 				action = PF_DROP;
6361 				log = 1;
6362 				goto done;
6363 			}
6364 			if (pd.proto == IPPROTO_AH)
6365 				off += (opt6.ip6e_len + 2) * 4;
6366 			else
6367 				off += (opt6.ip6e_len + 1) * 8;
6368 			pd.proto = opt6.ip6e_nxt;
6369 			/* goto the next header */
6370 			break;
6371 		}
6372 		default:
6373 			terminal++;
6374 			break;
6375 		}
6376 	} while (!terminal);
6377 
6378 	/* if there's no routing header, use unmodified mbuf for checksumming */
6379 	if (!n)
6380 		n = m;
6381 
6382 	switch (pd.proto) {
6383 
6384 	case IPPROTO_TCP: {
6385 		struct tcphdr	th;
6386 
6387 		pd.hdr.tcp = &th;
6388 		if (!pf_pull_hdr(m, off, &th, sizeof(th),
6389 		    &action, &reason, AF_INET6)) {
6390 			log = action != PF_PASS;
6391 			goto done;
6392 		}
6393 		pd.p_len = pd.tot_len - off - (th.th_off << 2);
6394 		action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
6395 		if (action == PF_DROP)
6396 			goto done;
6397 		action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
6398 		    &reason);
6399 		if (action == PF_PASS) {
6400 			if (pfsync_update_state_ptr != NULL)
6401 				pfsync_update_state_ptr(s);
6402 			r = s->rule.ptr;
6403 			a = s->anchor.ptr;
6404 			log = s->log;
6405 		} else if (s == NULL)
6406 			action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6407 			    &a, &ruleset, inp);
6408 		break;
6409 	}
6410 
6411 	case IPPROTO_UDP: {
6412 		struct udphdr	uh;
6413 
6414 		pd.hdr.udp = &uh;
6415 		if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
6416 		    &action, &reason, AF_INET6)) {
6417 			log = action != PF_PASS;
6418 			goto done;
6419 		}
6420 		if (uh.uh_dport == 0 ||
6421 		    ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
6422 		    ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
6423 			action = PF_DROP;
6424 			REASON_SET(&reason, PFRES_SHORT);
6425 			goto done;
6426 		}
6427 		action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
6428 		if (action == PF_PASS) {
6429 			if (pfsync_update_state_ptr != NULL)
6430 				pfsync_update_state_ptr(s);
6431 			r = s->rule.ptr;
6432 			a = s->anchor.ptr;
6433 			log = s->log;
6434 		} else if (s == NULL)
6435 			action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6436 			    &a, &ruleset, inp);
6437 		break;
6438 	}
6439 
6440 	case IPPROTO_ICMP: {
6441 		action = PF_DROP;
6442 		DPFPRINTF(PF_DEBUG_MISC,
6443 		    ("pf: dropping IPv6 packet with ICMPv4 payload\n"));
6444 		goto done;
6445 	}
6446 
6447 	case IPPROTO_ICMPV6: {
6448 		struct icmp6_hdr	ih;
6449 
6450 		pd.hdr.icmp6 = &ih;
6451 		if (!pf_pull_hdr(m, off, &ih, sizeof(ih),
6452 		    &action, &reason, AF_INET6)) {
6453 			log = action != PF_PASS;
6454 			goto done;
6455 		}
6456 		action = pf_test_state_icmp(&s, dir, kif,
6457 		    m, off, h, &pd, &reason);
6458 		if (action == PF_PASS) {
6459 			if (pfsync_update_state_ptr != NULL)
6460 				pfsync_update_state_ptr(s);
6461 			r = s->rule.ptr;
6462 			a = s->anchor.ptr;
6463 			log = s->log;
6464 		} else if (s == NULL)
6465 			action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6466 			    &a, &ruleset, inp);
6467 		break;
6468 	}
6469 
6470 	default:
6471 		action = pf_test_state_other(&s, dir, kif, m, &pd);
6472 		if (action == PF_PASS) {
6473 			if (pfsync_update_state_ptr != NULL)
6474 				pfsync_update_state_ptr(s);
6475 			r = s->rule.ptr;
6476 			a = s->anchor.ptr;
6477 			log = s->log;
6478 		} else if (s == NULL)
6479 			action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6480 			    &a, &ruleset, inp);
6481 		break;
6482 	}
6483 
6484 done:
6485 	PF_RULES_RUNLOCK();
6486 	if (n != m) {
6487 		m_freem(n);
6488 		n = NULL;
6489 	}
6490 
6491 	/* handle dangerous IPv6 extension headers. */
6492 	if (action == PF_PASS && rh_cnt &&
6493 	    !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
6494 		action = PF_DROP;
6495 		REASON_SET(&reason, PFRES_IPOPTIONS);
6496 		log = r->log;
6497 		DPFPRINTF(PF_DEBUG_MISC,
6498 		    ("pf: dropping packet with dangerous v6 headers\n"));
6499 	}
6500 
6501 	if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) {
6502 		action = PF_DROP;
6503 		REASON_SET(&reason, PFRES_MEMORY);
6504 	}
6505 	if (r->rtableid >= 0)
6506 		M_SETFIB(m, r->rtableid);
6507 
6508 	if (r->scrub_flags & PFSTATE_SETPRIO) {
6509 		if (pd.tos & IPTOS_LOWDELAY)
6510 			pqid = 1;
6511 		if (pf_ieee8021q_setpcp(m, r->set_prio[pqid])) {
6512 			action = PF_DROP;
6513 			REASON_SET(&reason, PFRES_MEMORY);
6514 			log = 1;
6515 			DPFPRINTF(PF_DEBUG_MISC,
6516 			    ("pf: failed to allocate 802.1q mtag\n"));
6517 		}
6518 	}
6519 
6520 #ifdef ALTQ
6521 	if (action == PF_PASS && r->qid) {
6522 		if (pd.pf_mtag == NULL &&
6523 		    ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
6524 			action = PF_DROP;
6525 			REASON_SET(&reason, PFRES_MEMORY);
6526 		} else {
6527 			if (s != NULL)
6528 				pd.pf_mtag->qid_hash = pf_state_hash(s);
6529 			if (pd.tos & IPTOS_LOWDELAY)
6530 				pd.pf_mtag->qid = r->pqid;
6531 			else
6532 				pd.pf_mtag->qid = r->qid;
6533 			/* Add hints for ecn. */
6534 			pd.pf_mtag->hdr = h;
6535 		}
6536 	}
6537 #endif /* ALTQ */
6538 
6539 	if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
6540 	    pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
6541 	    (s->nat_rule.ptr->action == PF_RDR ||
6542 	    s->nat_rule.ptr->action == PF_BINAT) &&
6543 	    IN6_IS_ADDR_LOOPBACK(&pd.dst->v6))
6544 		m->m_flags |= M_SKIP_FIREWALL;
6545 
6546 	/* XXX: Anybody working on it?! */
6547 	if (r->divert.port)
6548 		printf("pf: divert(9) is not supported for IPv6\n");
6549 
6550 	if (log) {
6551 		struct pf_rule *lr;
6552 
6553 		if (s != NULL && s->nat_rule.ptr != NULL &&
6554 		    s->nat_rule.ptr->log & PF_LOG_ALL)
6555 			lr = s->nat_rule.ptr;
6556 		else
6557 			lr = r;
6558 		PFLOG_PACKET(kif, m, AF_INET6, dir, reason, lr, a, ruleset,
6559 		    &pd, (s == NULL));
6560 	}
6561 
6562 	kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6563 	kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;
6564 
6565 	if (action == PF_PASS || r->action == PF_DROP) {
6566 		dirndx = (dir == PF_OUT);
6567 		r->packets[dirndx]++;
6568 		r->bytes[dirndx] += pd.tot_len;
6569 		if (a != NULL) {
6570 			a->packets[dirndx]++;
6571 			a->bytes[dirndx] += pd.tot_len;
6572 		}
6573 		if (s != NULL) {
6574 			if (s->nat_rule.ptr != NULL) {
6575 				s->nat_rule.ptr->packets[dirndx]++;
6576 				s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6577 			}
6578 			if (s->src_node != NULL) {
6579 				s->src_node->packets[dirndx]++;
6580 				s->src_node->bytes[dirndx] += pd.tot_len;
6581 			}
6582 			if (s->nat_src_node != NULL) {
6583 				s->nat_src_node->packets[dirndx]++;
6584 				s->nat_src_node->bytes[dirndx] += pd.tot_len;
6585 			}
6586 			dirndx = (dir == s->direction) ? 0 : 1;
6587 			s->packets[dirndx]++;
6588 			s->bytes[dirndx] += pd.tot_len;
6589 		}
6590 		tr = r;
6591 		nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6592 		if (nr != NULL && r == &V_pf_default_rule)
6593 			tr = nr;
6594 		if (tr->src.addr.type == PF_ADDR_TABLE)
6595 			pfr_update_stats(tr->src.addr.p.tbl,
6596 			    (s == NULL) ? pd.src :
6597 			    &s->key[(s->direction == PF_IN)]->addr[0],
6598 			    pd.af, pd.tot_len, dir == PF_OUT,
6599 			    r->action == PF_PASS, tr->src.neg);
6600 		if (tr->dst.addr.type == PF_ADDR_TABLE)
6601 			pfr_update_stats(tr->dst.addr.p.tbl,
6602 			    (s == NULL) ? pd.dst :
6603 			    &s->key[(s->direction == PF_IN)]->addr[1],
6604 			    pd.af, pd.tot_len, dir == PF_OUT,
6605 			    r->action == PF_PASS, tr->dst.neg);
6606 	}
6607 
6608 	switch (action) {
6609 	case PF_SYNPROXY_DROP:
6610 		m_freem(*m0);
6611 	case PF_DEFER:
6612 		*m0 = NULL;
6613 		action = PF_PASS;
6614 		break;
6615 	case PF_DROP:
6616 		m_freem(*m0);
6617 		*m0 = NULL;
6618 		break;
6619 	default:
6620 		/* pf_route6() returns unlocked. */
6621 		if (r->rt) {
6622 			pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd);
6623 			return (action);
6624 		}
6625 		break;
6626 	}
6627 
6628 	if (s)
6629 		PF_STATE_UNLOCK(s);
6630 
6631 	/* If reassembled packet passed, create new fragments. */
6632 	if (action == PF_PASS && *m0 && fwdir == PF_FWD &&
6633 	    (mtag = m_tag_find(m, PF_REASSEMBLED, NULL)) != NULL)
6634 		action = pf_refragment6(ifp, m0, mtag);
6635 
6636 	return (action);
6637 }
6638 #endif /* INET6 */
6639