1 /*-
2 * SPDX-License-Identifier: (BSD-2-Clause-FreeBSD AND ISC)
3 *
4 * Copyright (c) 2002 Michael Shalayeff
5 * Copyright (c) 2012 Gleb Smirnoff <[email protected]>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
21 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
23 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
26 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
27 * THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 /*-
31 * Copyright (c) 2009 David Gwynne <[email protected]>
32 *
33 * Permission to use, copy, modify, and distribute this software for any
34 * purpose with or without fee is hereby granted, provided that the above
35 * copyright notice and this permission notice appear in all copies.
36 *
37 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
38 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
39 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
40 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
41 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
42 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
43 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
44 */
45
46 /*
47 * $OpenBSD: if_pfsync.c,v 1.110 2009/02/24 05:39:19 dlg Exp $
48 *
49 * Revisions picked from OpenBSD after revision 1.110 import:
50 * 1.119 - don't m_copydata() beyond the len of mbuf in pfsync_input()
51 * 1.118, 1.124, 1.148, 1.149, 1.151, 1.171 - fixes to bulk updates
52 * 1.120, 1.175 - use monotonic time_uptime
53 * 1.122 - reduce number of updates for non-TCP sessions
54 * 1.125, 1.127 - rewrite merge or stale processing
55 * 1.128 - cleanups
56 * 1.146 - bzero() mbuf before sparsely filling it with data
57 * 1.170 - SIOCSIFMTU checks
58 * 1.126, 1.142 - deferred packets processing
59 * 1.173 - correct expire time processing
60 */
61
62 #include <sys/cdefs.h>
63 __FBSDID("$FreeBSD$");
64
65 #include "opt_inet.h"
66 #include "opt_inet6.h"
67 #include "opt_pf.h"
68
69 #include <sys/param.h>
70 #include <sys/bus.h>
71 #include <sys/endian.h>
72 #include <sys/interrupt.h>
73 #include <sys/kernel.h>
74 #include <sys/lock.h>
75 #include <sys/mbuf.h>
76 #include <sys/module.h>
77 #include <sys/mutex.h>
78 #include <sys/priv.h>
79 #include <sys/protosw.h>
80 #include <sys/smp.h>
81 #include <sys/socket.h>
82 #include <sys/sockio.h>
83 #include <sys/sysctl.h>
84 #include <sys/syslog.h>
85
86 #include <net/bpf.h>
87 #include <net/if.h>
88 #include <net/if_var.h>
89 #include <net/if_clone.h>
90 #include <net/if_types.h>
91 #include <net/vnet.h>
92 #include <net/pfvar.h>
93 #include <net/if_pfsync.h>
94
95 #include <netinet/if_ether.h>
96 #include <netinet/in.h>
97 #include <netinet/in_var.h>
98 #include <netinet/ip.h>
99 #include <netinet/ip_carp.h>
100 #include <netinet/ip_var.h>
101 #include <netinet/tcp.h>
102 #include <netinet/tcp_fsm.h>
103 #include <netinet/tcp_seq.h>
104
105 #define PFSYNC_MINPKT ( \
106 sizeof(struct ip) + \
107 sizeof(struct pfsync_header) + \
108 sizeof(struct pfsync_subheader) )
109
110 struct pfsync_bucket;
111
112 struct pfsync_pkt {
113 struct ip *ip;
114 struct in_addr src;
115 u_int8_t flags;
116 };
117
118 static int pfsync_upd_tcp(struct pf_state *, struct pfsync_state_peer *,
119 struct pfsync_state_peer *);
120 static int pfsync_in_clr(struct pfsync_pkt *, struct mbuf *, int, int);
121 static int pfsync_in_ins(struct pfsync_pkt *, struct mbuf *, int, int);
122 static int pfsync_in_iack(struct pfsync_pkt *, struct mbuf *, int, int);
123 static int pfsync_in_upd(struct pfsync_pkt *, struct mbuf *, int, int);
124 static int pfsync_in_upd_c(struct pfsync_pkt *, struct mbuf *, int, int);
125 static int pfsync_in_ureq(struct pfsync_pkt *, struct mbuf *, int, int);
126 static int pfsync_in_del(struct pfsync_pkt *, struct mbuf *, int, int);
127 static int pfsync_in_del_c(struct pfsync_pkt *, struct mbuf *, int, int);
128 static int pfsync_in_bus(struct pfsync_pkt *, struct mbuf *, int, int);
129 static int pfsync_in_tdb(struct pfsync_pkt *, struct mbuf *, int, int);
130 static int pfsync_in_eof(struct pfsync_pkt *, struct mbuf *, int, int);
131 static int pfsync_in_error(struct pfsync_pkt *, struct mbuf *, int, int);
132
133 static int (*pfsync_acts[])(struct pfsync_pkt *, struct mbuf *, int, int) = {
134 pfsync_in_clr, /* PFSYNC_ACT_CLR */
135 pfsync_in_ins, /* PFSYNC_ACT_INS */
136 pfsync_in_iack, /* PFSYNC_ACT_INS_ACK */
137 pfsync_in_upd, /* PFSYNC_ACT_UPD */
138 pfsync_in_upd_c, /* PFSYNC_ACT_UPD_C */
139 pfsync_in_ureq, /* PFSYNC_ACT_UPD_REQ */
140 pfsync_in_del, /* PFSYNC_ACT_DEL */
141 pfsync_in_del_c, /* PFSYNC_ACT_DEL_C */
142 pfsync_in_error, /* PFSYNC_ACT_INS_F */
143 pfsync_in_error, /* PFSYNC_ACT_DEL_F */
144 pfsync_in_bus, /* PFSYNC_ACT_BUS */
145 pfsync_in_tdb, /* PFSYNC_ACT_TDB */
146 pfsync_in_eof /* PFSYNC_ACT_EOF */
147 };
148
149 struct pfsync_q {
150 void (*write)(struct pf_state *, void *);
151 size_t len;
152 u_int8_t action;
153 };
154
155 /* we have one of these for every PFSYNC_S_ */
156 static void pfsync_out_state(struct pf_state *, void *);
157 static void pfsync_out_iack(struct pf_state *, void *);
158 static void pfsync_out_upd_c(struct pf_state *, void *);
159 static void pfsync_out_del(struct pf_state *, void *);
160
161 static struct pfsync_q pfsync_qs[] = {
162 { pfsync_out_state, sizeof(struct pfsync_state), PFSYNC_ACT_INS },
163 { pfsync_out_iack, sizeof(struct pfsync_ins_ack), PFSYNC_ACT_INS_ACK },
164 { pfsync_out_state, sizeof(struct pfsync_state), PFSYNC_ACT_UPD },
165 { pfsync_out_upd_c, sizeof(struct pfsync_upd_c), PFSYNC_ACT_UPD_C },
166 { pfsync_out_del, sizeof(struct pfsync_del_c), PFSYNC_ACT_DEL_C }
167 };
168
169 static void pfsync_q_ins(struct pf_state *, int, bool);
170 static void pfsync_q_del(struct pf_state *, bool, struct pfsync_bucket *);
171
172 static void pfsync_update_state(struct pf_state *);
173
174 struct pfsync_upd_req_item {
175 TAILQ_ENTRY(pfsync_upd_req_item) ur_entry;
176 struct pfsync_upd_req ur_msg;
177 };
178
179 struct pfsync_deferral {
180 struct pfsync_softc *pd_sc;
181 TAILQ_ENTRY(pfsync_deferral) pd_entry;
182 u_int pd_refs;
183 struct callout pd_tmo;
184
185 struct pf_state *pd_st;
186 struct mbuf *pd_m;
187 };
188
189 struct pfsync_sofct;
190
191 struct pfsync_bucket
192 {
193 int b_id;
194 struct pfsync_softc *b_sc;
195 struct mtx b_mtx;
196 struct callout b_tmo;
197 int b_flags;
198 #define PFSYNCF_BUCKET_PUSH 0x00000001
199
200 size_t b_len;
201 TAILQ_HEAD(, pf_state) b_qs[PFSYNC_S_COUNT];
202 TAILQ_HEAD(, pfsync_upd_req_item) b_upd_req_list;
203 TAILQ_HEAD(, pfsync_deferral) b_deferrals;
204 u_int b_deferred;
205 void *b_plus;
206 size_t b_pluslen;
207
208 struct ifaltq b_snd;
209 };
210
211 struct pfsync_softc {
212 /* Configuration */
213 struct ifnet *sc_ifp;
214 struct ifnet *sc_sync_if;
215 struct ip_moptions sc_imo;
216 struct in_addr sc_sync_peer;
217 uint32_t sc_flags;
218 #define PFSYNCF_OK 0x00000001
219 #define PFSYNCF_DEFER 0x00000002
220 uint8_t sc_maxupdates;
221 struct ip sc_template;
222 struct mtx sc_mtx;
223
224 /* Queued data */
225 struct pfsync_bucket *sc_buckets;
226
227 /* Bulk update info */
228 struct mtx sc_bulk_mtx;
229 uint32_t sc_ureq_sent;
230 int sc_bulk_tries;
231 uint32_t sc_ureq_received;
232 int sc_bulk_hashid;
233 uint64_t sc_bulk_stateid;
234 uint32_t sc_bulk_creatorid;
235 struct callout sc_bulk_tmo;
236 struct callout sc_bulkfail_tmo;
237 };
238
239 #define PFSYNC_LOCK(sc) mtx_lock(&(sc)->sc_mtx)
240 #define PFSYNC_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx)
241 #define PFSYNC_LOCK_ASSERT(sc) mtx_assert(&(sc)->sc_mtx, MA_OWNED)
242
243 #define PFSYNC_BUCKET_LOCK(b) mtx_lock(&(b)->b_mtx)
244 #define PFSYNC_BUCKET_UNLOCK(b) mtx_unlock(&(b)->b_mtx)
245 #define PFSYNC_BUCKET_LOCK_ASSERT(b) mtx_assert(&(b)->b_mtx, MA_OWNED)
246
247 #define PFSYNC_BLOCK(sc) mtx_lock(&(sc)->sc_bulk_mtx)
248 #define PFSYNC_BUNLOCK(sc) mtx_unlock(&(sc)->sc_bulk_mtx)
249 #define PFSYNC_BLOCK_ASSERT(sc) mtx_assert(&(sc)->sc_bulk_mtx, MA_OWNED)
250
251 static const char pfsyncname[] = "pfsync";
252 static MALLOC_DEFINE(M_PFSYNC, pfsyncname, "pfsync(4) data");
253 VNET_DEFINE_STATIC(struct pfsync_softc *, pfsyncif) = NULL;
254 #define V_pfsyncif VNET(pfsyncif)
255 VNET_DEFINE_STATIC(void *, pfsync_swi_cookie) = NULL;
256 #define V_pfsync_swi_cookie VNET(pfsync_swi_cookie)
257 VNET_DEFINE_STATIC(struct pfsyncstats, pfsyncstats);
258 #define V_pfsyncstats VNET(pfsyncstats)
259 VNET_DEFINE_STATIC(int, pfsync_carp_adj) = CARP_MAXSKEW;
260 #define V_pfsync_carp_adj VNET(pfsync_carp_adj)
261
262 static void pfsync_timeout(void *);
263 static void pfsync_push(struct pfsync_bucket *);
264 static void pfsync_push_all(struct pfsync_softc *);
265 static void pfsyncintr(void *);
266 static int pfsync_multicast_setup(struct pfsync_softc *, struct ifnet *,
267 struct in_mfilter *imf);
268 static void pfsync_multicast_cleanup(struct pfsync_softc *);
269 static void pfsync_pointers_init(void);
270 static void pfsync_pointers_uninit(void);
271 static int pfsync_init(void);
272 static void pfsync_uninit(void);
273
274 static unsigned long pfsync_buckets;
275
276 SYSCTL_NODE(_net, OID_AUTO, pfsync, CTLFLAG_RW, 0, "PFSYNC");
277 SYSCTL_STRUCT(_net_pfsync, OID_AUTO, stats, CTLFLAG_VNET | CTLFLAG_RW,
278 &VNET_NAME(pfsyncstats), pfsyncstats,
279 "PFSYNC statistics (struct pfsyncstats, net/if_pfsync.h)");
280 SYSCTL_INT(_net_pfsync, OID_AUTO, carp_demotion_factor, CTLFLAG_RW,
281 &VNET_NAME(pfsync_carp_adj), 0, "pfsync's CARP demotion factor adjustment");
282 SYSCTL_ULONG(_net_pfsync, OID_AUTO, pfsync_buckets, CTLFLAG_RDTUN,
283 &pfsync_buckets, 0, "Number of pfsync hash buckets");
284
285 static int pfsync_clone_create(struct if_clone *, int, caddr_t);
286 static void pfsync_clone_destroy(struct ifnet *);
287 static int pfsync_alloc_scrub_memory(struct pfsync_state_peer *,
288 struct pf_state_peer *);
289 static int pfsyncoutput(struct ifnet *, struct mbuf *,
290 const struct sockaddr *, struct route *);
291 static int pfsyncioctl(struct ifnet *, u_long, caddr_t);
292
293 static int pfsync_defer(struct pf_state *, struct mbuf *);
294 static void pfsync_undefer(struct pfsync_deferral *, int);
295 static void pfsync_undefer_state(struct pf_state *, int);
296 static void pfsync_defer_tmo(void *);
297
298 static void pfsync_request_update(u_int32_t, u_int64_t);
299 static bool pfsync_update_state_req(struct pf_state *);
300
301 static void pfsync_drop(struct pfsync_softc *);
302 static void pfsync_sendout(int, int);
303 static void pfsync_send_plus(void *, size_t);
304
305 static void pfsync_bulk_start(void);
306 static void pfsync_bulk_status(u_int8_t);
307 static void pfsync_bulk_update(void *);
308 static void pfsync_bulk_fail(void *);
309
310 static void pfsync_detach_ifnet(struct ifnet *);
311 #ifdef IPSEC
312 static void pfsync_update_net_tdb(struct pfsync_tdb *);
313 #endif
314 static struct pfsync_bucket *pfsync_get_bucket(struct pfsync_softc *,
315 struct pf_state *);
316
317
318 #define PFSYNC_MAX_BULKTRIES 12
319
320 VNET_DEFINE(struct if_clone *, pfsync_cloner);
321 #define V_pfsync_cloner VNET(pfsync_cloner)
322
323 static int
pfsync_clone_create(struct if_clone * ifc,int unit,caddr_t param)324 pfsync_clone_create(struct if_clone *ifc, int unit, caddr_t param)
325 {
326 struct pfsync_softc *sc;
327 struct ifnet *ifp;
328 struct pfsync_bucket *b;
329 int c, q;
330
331 if (unit != 0)
332 return (EINVAL);
333
334 if (! pfsync_buckets)
335 pfsync_buckets = mp_ncpus * 2;
336
337 sc = malloc(sizeof(struct pfsync_softc), M_PFSYNC, M_WAITOK | M_ZERO);
338 sc->sc_flags |= PFSYNCF_OK;
339 sc->sc_maxupdates = 128;
340
341 ifp = sc->sc_ifp = if_alloc(IFT_PFSYNC);
342 if (ifp == NULL) {
343 free(sc, M_PFSYNC);
344 return (ENOSPC);
345 }
346 if_initname(ifp, pfsyncname, unit);
347 ifp->if_softc = sc;
348 ifp->if_ioctl = pfsyncioctl;
349 ifp->if_output = pfsyncoutput;
350 ifp->if_type = IFT_PFSYNC;
351 ifp->if_hdrlen = sizeof(struct pfsync_header);
352 ifp->if_mtu = ETHERMTU;
353 mtx_init(&sc->sc_mtx, pfsyncname, NULL, MTX_DEF);
354 mtx_init(&sc->sc_bulk_mtx, "pfsync bulk", NULL, MTX_DEF);
355 callout_init_mtx(&sc->sc_bulk_tmo, &sc->sc_bulk_mtx, 0);
356 callout_init_mtx(&sc->sc_bulkfail_tmo, &sc->sc_bulk_mtx, 0);
357
358 if_attach(ifp);
359
360 bpfattach(ifp, DLT_PFSYNC, PFSYNC_HDRLEN);
361
362 sc->sc_buckets = mallocarray(pfsync_buckets, sizeof(*sc->sc_buckets),
363 M_PFSYNC, M_ZERO | M_WAITOK);
364 for (c = 0; c < pfsync_buckets; c++) {
365 b = &sc->sc_buckets[c];
366 mtx_init(&b->b_mtx, "pfsync bucket", NULL, MTX_DEF);
367
368 b->b_id = c;
369 b->b_sc = sc;
370 b->b_len = PFSYNC_MINPKT;
371
372 for (q = 0; q < PFSYNC_S_COUNT; q++)
373 TAILQ_INIT(&b->b_qs[q]);
374
375 TAILQ_INIT(&b->b_upd_req_list);
376 TAILQ_INIT(&b->b_deferrals);
377
378 callout_init(&b->b_tmo, 1);
379
380 b->b_snd.ifq_maxlen = ifqmaxlen;
381 }
382
383 V_pfsyncif = sc;
384
385 return (0);
386 }
387
388 static void
pfsync_clone_destroy(struct ifnet * ifp)389 pfsync_clone_destroy(struct ifnet *ifp)
390 {
391 struct pfsync_softc *sc = ifp->if_softc;
392 struct pfsync_bucket *b;
393 int c;
394
395 for (c = 0; c < pfsync_buckets; c++) {
396 b = &sc->sc_buckets[c];
397 /*
398 * At this stage, everything should have already been
399 * cleared by pfsync_uninit(), and we have only to
400 * drain callouts.
401 */
402 while (b->b_deferred > 0) {
403 struct pfsync_deferral *pd =
404 TAILQ_FIRST(&b->b_deferrals);
405
406 TAILQ_REMOVE(&b->b_deferrals, pd, pd_entry);
407 b->b_deferred--;
408 if (callout_stop(&pd->pd_tmo) > 0) {
409 pf_release_state(pd->pd_st);
410 m_freem(pd->pd_m);
411 free(pd, M_PFSYNC);
412 } else {
413 pd->pd_refs++;
414 callout_drain(&pd->pd_tmo);
415 free(pd, M_PFSYNC);
416 }
417 }
418
419 callout_drain(&b->b_tmo);
420 }
421
422 callout_drain(&sc->sc_bulkfail_tmo);
423 callout_drain(&sc->sc_bulk_tmo);
424
425 if (!(sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p)
426 (*carp_demote_adj_p)(-V_pfsync_carp_adj, "pfsync destroy");
427 bpfdetach(ifp);
428 if_detach(ifp);
429
430 pfsync_drop(sc);
431
432 if_free(ifp);
433 pfsync_multicast_cleanup(sc);
434 mtx_destroy(&sc->sc_mtx);
435 mtx_destroy(&sc->sc_bulk_mtx);
436
437 free(sc->sc_buckets, M_PFSYNC);
438 free(sc, M_PFSYNC);
439
440 V_pfsyncif = NULL;
441 }
442
443 static int
pfsync_alloc_scrub_memory(struct pfsync_state_peer * s,struct pf_state_peer * d)444 pfsync_alloc_scrub_memory(struct pfsync_state_peer *s,
445 struct pf_state_peer *d)
446 {
447 if (s->scrub.scrub_flag && d->scrub == NULL) {
448 d->scrub = uma_zalloc(V_pf_state_scrub_z, M_NOWAIT | M_ZERO);
449 if (d->scrub == NULL)
450 return (ENOMEM);
451 }
452
453 return (0);
454 }
455
456
457 static int
pfsync_state_import(struct pfsync_state * sp,u_int8_t flags)458 pfsync_state_import(struct pfsync_state *sp, u_int8_t flags)
459 {
460 struct pfsync_softc *sc = V_pfsyncif;
461 #ifndef __NO_STRICT_ALIGNMENT
462 struct pfsync_state_key key[2];
463 #endif
464 struct pfsync_state_key *kw, *ks;
465 struct pf_state *st = NULL;
466 struct pf_state_key *skw = NULL, *sks = NULL;
467 struct pf_rule *r = NULL;
468 struct pfi_kif *kif;
469 int error;
470
471 PF_RULES_RASSERT();
472
473 if (sp->creatorid == 0) {
474 if (V_pf_status.debug >= PF_DEBUG_MISC)
475 printf("%s: invalid creator id: %08x\n", __func__,
476 ntohl(sp->creatorid));
477 return (EINVAL);
478 }
479
480 if ((kif = pfi_kif_find(sp->ifname)) == NULL) {
481 if (V_pf_status.debug >= PF_DEBUG_MISC)
482 printf("%s: unknown interface: %s\n", __func__,
483 sp->ifname);
484 if (flags & PFSYNC_SI_IOCTL)
485 return (EINVAL);
486 return (0); /* skip this state */
487 }
488
489 /*
490 * If the ruleset checksums match or the state is coming from the ioctl,
491 * it's safe to associate the state with the rule of that number.
492 */
493 if (sp->rule != htonl(-1) && sp->anchor == htonl(-1) &&
494 (flags & (PFSYNC_SI_IOCTL | PFSYNC_SI_CKSUM)) && ntohl(sp->rule) <
495 pf_main_ruleset.rules[PF_RULESET_FILTER].active.rcount)
496 r = pf_main_ruleset.rules[
497 PF_RULESET_FILTER].active.ptr_array[ntohl(sp->rule)];
498 else
499 r = &V_pf_default_rule;
500
501 if ((r->max_states &&
502 counter_u64_fetch(r->states_cur) >= r->max_states))
503 goto cleanup;
504
505 /*
506 * XXXGL: consider M_WAITOK in ioctl path after.
507 */
508 if ((st = uma_zalloc(V_pf_state_z, M_NOWAIT | M_ZERO)) == NULL)
509 goto cleanup;
510
511 if ((skw = uma_zalloc(V_pf_state_key_z, M_NOWAIT)) == NULL)
512 goto cleanup;
513
514 #ifndef __NO_STRICT_ALIGNMENT
515 bcopy(&sp->key, key, sizeof(struct pfsync_state_key) * 2);
516 kw = &key[PF_SK_WIRE];
517 ks = &key[PF_SK_STACK];
518 #else
519 kw = &sp->key[PF_SK_WIRE];
520 ks = &sp->key[PF_SK_STACK];
521 #endif
522
523 if (PF_ANEQ(&kw->addr[0], &ks->addr[0], sp->af) ||
524 PF_ANEQ(&kw->addr[1], &ks->addr[1], sp->af) ||
525 kw->port[0] != ks->port[0] ||
526 kw->port[1] != ks->port[1]) {
527 sks = uma_zalloc(V_pf_state_key_z, M_NOWAIT);
528 if (sks == NULL)
529 goto cleanup;
530 } else
531 sks = skw;
532
533 /* allocate memory for scrub info */
534 if (pfsync_alloc_scrub_memory(&sp->src, &st->src) ||
535 pfsync_alloc_scrub_memory(&sp->dst, &st->dst))
536 goto cleanup;
537
538 /* Copy to state key(s). */
539 skw->addr[0] = kw->addr[0];
540 skw->addr[1] = kw->addr[1];
541 skw->port[0] = kw->port[0];
542 skw->port[1] = kw->port[1];
543 skw->proto = sp->proto;
544 skw->af = sp->af;
545 if (sks != skw) {
546 sks->addr[0] = ks->addr[0];
547 sks->addr[1] = ks->addr[1];
548 sks->port[0] = ks->port[0];
549 sks->port[1] = ks->port[1];
550 sks->proto = sp->proto;
551 sks->af = sp->af;
552 }
553
554 /* copy to state */
555 bcopy(&sp->rt_addr, &st->rt_addr, sizeof(st->rt_addr));
556 st->creation = time_uptime - ntohl(sp->creation);
557 st->expire = time_uptime;
558 if (sp->expire) {
559 uint32_t timeout;
560
561 timeout = r->timeout[sp->timeout];
562 if (!timeout)
563 timeout = V_pf_default_rule.timeout[sp->timeout];
564
565 /* sp->expire may have been adaptively scaled by export. */
566 st->expire -= timeout - ntohl(sp->expire);
567 }
568
569 st->direction = sp->direction;
570 st->log = sp->log;
571 st->timeout = sp->timeout;
572 st->state_flags = sp->state_flags;
573
574 st->id = sp->id;
575 st->creatorid = sp->creatorid;
576 pf_state_peer_ntoh(&sp->src, &st->src);
577 pf_state_peer_ntoh(&sp->dst, &st->dst);
578
579 st->rule.ptr = r;
580 st->nat_rule.ptr = NULL;
581 st->anchor.ptr = NULL;
582 st->rt_kif = NULL;
583
584 st->pfsync_time = time_uptime;
585 st->sync_state = PFSYNC_S_NONE;
586
587 if (!(flags & PFSYNC_SI_IOCTL))
588 st->state_flags |= PFSTATE_NOSYNC;
589
590 if ((error = pf_state_insert(kif, skw, sks, st)) != 0)
591 goto cleanup_state;
592
593 /* XXX when we have nat_rule/anchors, use STATE_INC_COUNTERS */
594 counter_u64_add(r->states_cur, 1);
595 counter_u64_add(r->states_tot, 1);
596
597 if (!(flags & PFSYNC_SI_IOCTL)) {
598 st->state_flags &= ~PFSTATE_NOSYNC;
599 if (st->state_flags & PFSTATE_ACK) {
600 pfsync_q_ins(st, PFSYNC_S_IACK, true);
601 pfsync_push_all(sc);
602 }
603 }
604 st->state_flags &= ~PFSTATE_ACK;
605 PF_STATE_UNLOCK(st);
606
607 return (0);
608
609 cleanup:
610 error = ENOMEM;
611 if (skw == sks)
612 sks = NULL;
613 if (skw != NULL)
614 uma_zfree(V_pf_state_key_z, skw);
615 if (sks != NULL)
616 uma_zfree(V_pf_state_key_z, sks);
617
618 cleanup_state: /* pf_state_insert() frees the state keys. */
619 if (st) {
620 if (st->dst.scrub)
621 uma_zfree(V_pf_state_scrub_z, st->dst.scrub);
622 if (st->src.scrub)
623 uma_zfree(V_pf_state_scrub_z, st->src.scrub);
624 uma_zfree(V_pf_state_z, st);
625 }
626 return (error);
627 }
628
629 static int
pfsync_input(struct mbuf ** mp,int * offp __unused,int proto __unused)630 pfsync_input(struct mbuf **mp, int *offp __unused, int proto __unused)
631 {
632 struct pfsync_softc *sc = V_pfsyncif;
633 struct pfsync_pkt pkt;
634 struct mbuf *m = *mp;
635 struct ip *ip = mtod(m, struct ip *);
636 struct pfsync_header *ph;
637 struct pfsync_subheader subh;
638
639 int offset, len;
640 int rv;
641 uint16_t count;
642
643 PF_RULES_RLOCK_TRACKER;
644
645 *mp = NULL;
646 V_pfsyncstats.pfsyncs_ipackets++;
647
648 /* Verify that we have a sync interface configured. */
649 if (!sc || !sc->sc_sync_if || !V_pf_status.running ||
650 (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
651 goto done;
652
653 /* verify that the packet came in on the right interface */
654 if (sc->sc_sync_if != m->m_pkthdr.rcvif) {
655 V_pfsyncstats.pfsyncs_badif++;
656 goto done;
657 }
658
659 if_inc_counter(sc->sc_ifp, IFCOUNTER_IPACKETS, 1);
660 if_inc_counter(sc->sc_ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
661 /* verify that the IP TTL is 255. */
662 if (ip->ip_ttl != PFSYNC_DFLTTL) {
663 V_pfsyncstats.pfsyncs_badttl++;
664 goto done;
665 }
666
667 offset = ip->ip_hl << 2;
668 if (m->m_pkthdr.len < offset + sizeof(*ph)) {
669 V_pfsyncstats.pfsyncs_hdrops++;
670 goto done;
671 }
672
673 if (offset + sizeof(*ph) > m->m_len) {
674 if (m_pullup(m, offset + sizeof(*ph)) == NULL) {
675 V_pfsyncstats.pfsyncs_hdrops++;
676 return (IPPROTO_DONE);
677 }
678 ip = mtod(m, struct ip *);
679 }
680 ph = (struct pfsync_header *)((char *)ip + offset);
681
682 /* verify the version */
683 if (ph->version != PFSYNC_VERSION) {
684 V_pfsyncstats.pfsyncs_badver++;
685 goto done;
686 }
687
688 len = ntohs(ph->len) + offset;
689 if (m->m_pkthdr.len < len) {
690 V_pfsyncstats.pfsyncs_badlen++;
691 goto done;
692 }
693
694 /* Cheaper to grab this now than having to mess with mbufs later */
695 pkt.ip = ip;
696 pkt.src = ip->ip_src;
697 pkt.flags = 0;
698
699 /*
700 * Trusting pf_chksum during packet processing, as well as seeking
701 * in interface name tree, require holding PF_RULES_RLOCK().
702 */
703 PF_RULES_RLOCK();
704 if (!bcmp(&ph->pfcksum, &V_pf_status.pf_chksum, PF_MD5_DIGEST_LENGTH))
705 pkt.flags |= PFSYNC_SI_CKSUM;
706
707 offset += sizeof(*ph);
708 while (offset <= len - sizeof(subh)) {
709 m_copydata(m, offset, sizeof(subh), (caddr_t)&subh);
710 offset += sizeof(subh);
711
712 if (subh.action >= PFSYNC_ACT_MAX) {
713 V_pfsyncstats.pfsyncs_badact++;
714 PF_RULES_RUNLOCK();
715 goto done;
716 }
717
718 count = ntohs(subh.count);
719 V_pfsyncstats.pfsyncs_iacts[subh.action] += count;
720 rv = (*pfsync_acts[subh.action])(&pkt, m, offset, count);
721 if (rv == -1) {
722 PF_RULES_RUNLOCK();
723 return (IPPROTO_DONE);
724 }
725
726 offset += rv;
727 }
728 PF_RULES_RUNLOCK();
729
730 done:
731 m_freem(m);
732 return (IPPROTO_DONE);
733 }
734
735 static int
pfsync_in_clr(struct pfsync_pkt * pkt,struct mbuf * m,int offset,int count)736 pfsync_in_clr(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
737 {
738 struct pfsync_clr *clr;
739 struct mbuf *mp;
740 int len = sizeof(*clr) * count;
741 int i, offp;
742 u_int32_t creatorid;
743
744 mp = m_pulldown(m, offset, len, &offp);
745 if (mp == NULL) {
746 V_pfsyncstats.pfsyncs_badlen++;
747 return (-1);
748 }
749 clr = (struct pfsync_clr *)(mp->m_data + offp);
750
751 for (i = 0; i < count; i++) {
752 creatorid = clr[i].creatorid;
753
754 if (clr[i].ifname[0] != '\0' &&
755 pfi_kif_find(clr[i].ifname) == NULL)
756 continue;
757
758 for (int i = 0; i <= pf_hashmask; i++) {
759 struct pf_idhash *ih = &V_pf_idhash[i];
760 struct pf_state *s;
761 relock:
762 PF_HASHROW_LOCK(ih);
763 LIST_FOREACH(s, &ih->states, entry) {
764 if (s->creatorid == creatorid) {
765 s->state_flags |= PFSTATE_NOSYNC;
766 pf_unlink_state(s, PF_ENTER_LOCKED);
767 goto relock;
768 }
769 }
770 PF_HASHROW_UNLOCK(ih);
771 }
772 }
773
774 return (len);
775 }
776
777 static int
pfsync_in_ins(struct pfsync_pkt * pkt,struct mbuf * m,int offset,int count)778 pfsync_in_ins(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
779 {
780 struct mbuf *mp;
781 struct pfsync_state *sa, *sp;
782 int len = sizeof(*sp) * count;
783 int i, offp;
784
785 mp = m_pulldown(m, offset, len, &offp);
786 if (mp == NULL) {
787 V_pfsyncstats.pfsyncs_badlen++;
788 return (-1);
789 }
790 sa = (struct pfsync_state *)(mp->m_data + offp);
791
792 for (i = 0; i < count; i++) {
793 sp = &sa[i];
794
795 /* Check for invalid values. */
796 if (sp->timeout >= PFTM_MAX ||
797 sp->src.state > PF_TCPS_PROXY_DST ||
798 sp->dst.state > PF_TCPS_PROXY_DST ||
799 sp->direction > PF_OUT ||
800 (sp->af != AF_INET && sp->af != AF_INET6)) {
801 if (V_pf_status.debug >= PF_DEBUG_MISC)
802 printf("%s: invalid value\n", __func__);
803 V_pfsyncstats.pfsyncs_badval++;
804 continue;
805 }
806
807 if (pfsync_state_import(sp, pkt->flags) == ENOMEM)
808 /* Drop out, but process the rest of the actions. */
809 break;
810 }
811
812 return (len);
813 }
814
815 static int
pfsync_in_iack(struct pfsync_pkt * pkt,struct mbuf * m,int offset,int count)816 pfsync_in_iack(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
817 {
818 struct pfsync_ins_ack *ia, *iaa;
819 struct pf_state *st;
820
821 struct mbuf *mp;
822 int len = count * sizeof(*ia);
823 int offp, i;
824
825 mp = m_pulldown(m, offset, len, &offp);
826 if (mp == NULL) {
827 V_pfsyncstats.pfsyncs_badlen++;
828 return (-1);
829 }
830 iaa = (struct pfsync_ins_ack *)(mp->m_data + offp);
831
832 for (i = 0; i < count; i++) {
833 ia = &iaa[i];
834
835 st = pf_find_state_byid(ia->id, ia->creatorid);
836 if (st == NULL)
837 continue;
838
839 if (st->state_flags & PFSTATE_ACK) {
840 pfsync_undefer_state(st, 0);
841 }
842 PF_STATE_UNLOCK(st);
843 }
844 /*
845 * XXX this is not yet implemented, but we know the size of the
846 * message so we can skip it.
847 */
848
849 return (count * sizeof(struct pfsync_ins_ack));
850 }
851
852 static int
pfsync_upd_tcp(struct pf_state * st,struct pfsync_state_peer * src,struct pfsync_state_peer * dst)853 pfsync_upd_tcp(struct pf_state *st, struct pfsync_state_peer *src,
854 struct pfsync_state_peer *dst)
855 {
856 int sync = 0;
857
858 PF_STATE_LOCK_ASSERT(st);
859
860 /*
861 * The state should never go backwards except
862 * for syn-proxy states. Neither should the
863 * sequence window slide backwards.
864 */
865 if ((st->src.state > src->state &&
866 (st->src.state < PF_TCPS_PROXY_SRC ||
867 src->state >= PF_TCPS_PROXY_SRC)) ||
868
869 (st->src.state == src->state &&
870 SEQ_GT(st->src.seqlo, ntohl(src->seqlo))))
871 sync++;
872 else
873 pf_state_peer_ntoh(src, &st->src);
874
875 if ((st->dst.state > dst->state) ||
876
877 (st->dst.state >= TCPS_SYN_SENT &&
878 SEQ_GT(st->dst.seqlo, ntohl(dst->seqlo))))
879 sync++;
880 else
881 pf_state_peer_ntoh(dst, &st->dst);
882
883 return (sync);
884 }
885
886 static int
pfsync_in_upd(struct pfsync_pkt * pkt,struct mbuf * m,int offset,int count)887 pfsync_in_upd(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
888 {
889 struct pfsync_softc *sc = V_pfsyncif;
890 struct pfsync_state *sa, *sp;
891 struct pf_state *st;
892 int sync;
893
894 struct mbuf *mp;
895 int len = count * sizeof(*sp);
896 int offp, i;
897
898 mp = m_pulldown(m, offset, len, &offp);
899 if (mp == NULL) {
900 V_pfsyncstats.pfsyncs_badlen++;
901 return (-1);
902 }
903 sa = (struct pfsync_state *)(mp->m_data + offp);
904
905 for (i = 0; i < count; i++) {
906 sp = &sa[i];
907
908 /* check for invalid values */
909 if (sp->timeout >= PFTM_MAX ||
910 sp->src.state > PF_TCPS_PROXY_DST ||
911 sp->dst.state > PF_TCPS_PROXY_DST) {
912 if (V_pf_status.debug >= PF_DEBUG_MISC) {
913 printf("pfsync_input: PFSYNC_ACT_UPD: "
914 "invalid value\n");
915 }
916 V_pfsyncstats.pfsyncs_badval++;
917 continue;
918 }
919
920 st = pf_find_state_byid(sp->id, sp->creatorid);
921 if (st == NULL) {
922 /* insert the update */
923 if (pfsync_state_import(sp, pkt->flags))
924 V_pfsyncstats.pfsyncs_badstate++;
925 continue;
926 }
927
928 if (st->state_flags & PFSTATE_ACK) {
929 pfsync_undefer_state(st, 1);
930 }
931
932 if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP)
933 sync = pfsync_upd_tcp(st, &sp->src, &sp->dst);
934 else {
935 sync = 0;
936
937 /*
938 * Non-TCP protocol state machine always go
939 * forwards
940 */
941 if (st->src.state > sp->src.state)
942 sync++;
943 else
944 pf_state_peer_ntoh(&sp->src, &st->src);
945 if (st->dst.state > sp->dst.state)
946 sync++;
947 else
948 pf_state_peer_ntoh(&sp->dst, &st->dst);
949 }
950 if (sync < 2) {
951 pfsync_alloc_scrub_memory(&sp->dst, &st->dst);
952 pf_state_peer_ntoh(&sp->dst, &st->dst);
953 st->expire = time_uptime;
954 st->timeout = sp->timeout;
955 }
956 st->pfsync_time = time_uptime;
957
958 if (sync) {
959 V_pfsyncstats.pfsyncs_stale++;
960
961 pfsync_update_state(st);
962 PF_STATE_UNLOCK(st);
963 pfsync_push_all(sc);
964 continue;
965 }
966 PF_STATE_UNLOCK(st);
967 }
968
969 return (len);
970 }
971
972 static int
pfsync_in_upd_c(struct pfsync_pkt * pkt,struct mbuf * m,int offset,int count)973 pfsync_in_upd_c(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
974 {
975 struct pfsync_softc *sc = V_pfsyncif;
976 struct pfsync_upd_c *ua, *up;
977 struct pf_state *st;
978 int len = count * sizeof(*up);
979 int sync;
980 struct mbuf *mp;
981 int offp, i;
982
983 mp = m_pulldown(m, offset, len, &offp);
984 if (mp == NULL) {
985 V_pfsyncstats.pfsyncs_badlen++;
986 return (-1);
987 }
988 ua = (struct pfsync_upd_c *)(mp->m_data + offp);
989
990 for (i = 0; i < count; i++) {
991 up = &ua[i];
992
993 /* check for invalid values */
994 if (up->timeout >= PFTM_MAX ||
995 up->src.state > PF_TCPS_PROXY_DST ||
996 up->dst.state > PF_TCPS_PROXY_DST) {
997 if (V_pf_status.debug >= PF_DEBUG_MISC) {
998 printf("pfsync_input: "
999 "PFSYNC_ACT_UPD_C: "
1000 "invalid value\n");
1001 }
1002 V_pfsyncstats.pfsyncs_badval++;
1003 continue;
1004 }
1005
1006 st = pf_find_state_byid(up->id, up->creatorid);
1007 if (st == NULL) {
1008 /* We don't have this state. Ask for it. */
1009 PFSYNC_BUCKET_LOCK(&sc->sc_buckets[0]);
1010 pfsync_request_update(up->creatorid, up->id);
1011 PFSYNC_BUCKET_UNLOCK(&sc->sc_buckets[0]);
1012 continue;
1013 }
1014
1015 if (st->state_flags & PFSTATE_ACK) {
1016 pfsync_undefer_state(st, 1);
1017 }
1018
1019 if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP)
1020 sync = pfsync_upd_tcp(st, &up->src, &up->dst);
1021 else {
1022 sync = 0;
1023
1024 /*
1025 * Non-TCP protocol state machine always go
1026 * forwards
1027 */
1028 if (st->src.state > up->src.state)
1029 sync++;
1030 else
1031 pf_state_peer_ntoh(&up->src, &st->src);
1032 if (st->dst.state > up->dst.state)
1033 sync++;
1034 else
1035 pf_state_peer_ntoh(&up->dst, &st->dst);
1036 }
1037 if (sync < 2) {
1038 pfsync_alloc_scrub_memory(&up->dst, &st->dst);
1039 pf_state_peer_ntoh(&up->dst, &st->dst);
1040 st->expire = time_uptime;
1041 st->timeout = up->timeout;
1042 }
1043 st->pfsync_time = time_uptime;
1044
1045 if (sync) {
1046 V_pfsyncstats.pfsyncs_stale++;
1047
1048 pfsync_update_state(st);
1049 PF_STATE_UNLOCK(st);
1050 pfsync_push_all(sc);
1051 continue;
1052 }
1053 PF_STATE_UNLOCK(st);
1054 }
1055
1056 return (len);
1057 }
1058
1059 static int
pfsync_in_ureq(struct pfsync_pkt * pkt,struct mbuf * m,int offset,int count)1060 pfsync_in_ureq(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
1061 {
1062 struct pfsync_upd_req *ur, *ura;
1063 struct mbuf *mp;
1064 int len = count * sizeof(*ur);
1065 int i, offp;
1066
1067 struct pf_state *st;
1068
1069 mp = m_pulldown(m, offset, len, &offp);
1070 if (mp == NULL) {
1071 V_pfsyncstats.pfsyncs_badlen++;
1072 return (-1);
1073 }
1074 ura = (struct pfsync_upd_req *)(mp->m_data + offp);
1075
1076 for (i = 0; i < count; i++) {
1077 ur = &ura[i];
1078
1079 if (ur->id == 0 && ur->creatorid == 0)
1080 pfsync_bulk_start();
1081 else {
1082 st = pf_find_state_byid(ur->id, ur->creatorid);
1083 if (st == NULL) {
1084 V_pfsyncstats.pfsyncs_badstate++;
1085 continue;
1086 }
1087 if (st->state_flags & PFSTATE_NOSYNC) {
1088 PF_STATE_UNLOCK(st);
1089 continue;
1090 }
1091
1092 pfsync_update_state_req(st);
1093 PF_STATE_UNLOCK(st);
1094 }
1095 }
1096
1097 return (len);
1098 }
1099
1100 static int
pfsync_in_del(struct pfsync_pkt * pkt,struct mbuf * m,int offset,int count)1101 pfsync_in_del(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
1102 {
1103 struct mbuf *mp;
1104 struct pfsync_state *sa, *sp;
1105 struct pf_state *st;
1106 int len = count * sizeof(*sp);
1107 int offp, i;
1108
1109 mp = m_pulldown(m, offset, len, &offp);
1110 if (mp == NULL) {
1111 V_pfsyncstats.pfsyncs_badlen++;
1112 return (-1);
1113 }
1114 sa = (struct pfsync_state *)(mp->m_data + offp);
1115
1116 for (i = 0; i < count; i++) {
1117 sp = &sa[i];
1118
1119 st = pf_find_state_byid(sp->id, sp->creatorid);
1120 if (st == NULL) {
1121 V_pfsyncstats.pfsyncs_badstate++;
1122 continue;
1123 }
1124 st->state_flags |= PFSTATE_NOSYNC;
1125 pf_unlink_state(st, PF_ENTER_LOCKED);
1126 }
1127
1128 return (len);
1129 }
1130
1131 static int
pfsync_in_del_c(struct pfsync_pkt * pkt,struct mbuf * m,int offset,int count)1132 pfsync_in_del_c(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
1133 {
1134 struct mbuf *mp;
1135 struct pfsync_del_c *sa, *sp;
1136 struct pf_state *st;
1137 int len = count * sizeof(*sp);
1138 int offp, i;
1139
1140 mp = m_pulldown(m, offset, len, &offp);
1141 if (mp == NULL) {
1142 V_pfsyncstats.pfsyncs_badlen++;
1143 return (-1);
1144 }
1145 sa = (struct pfsync_del_c *)(mp->m_data + offp);
1146
1147 for (i = 0; i < count; i++) {
1148 sp = &sa[i];
1149
1150 st = pf_find_state_byid(sp->id, sp->creatorid);
1151 if (st == NULL) {
1152 V_pfsyncstats.pfsyncs_badstate++;
1153 continue;
1154 }
1155
1156 st->state_flags |= PFSTATE_NOSYNC;
1157 pf_unlink_state(st, PF_ENTER_LOCKED);
1158 }
1159
1160 return (len);
1161 }
1162
1163 static int
pfsync_in_bus(struct pfsync_pkt * pkt,struct mbuf * m,int offset,int count)1164 pfsync_in_bus(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
1165 {
1166 struct pfsync_softc *sc = V_pfsyncif;
1167 struct pfsync_bus *bus;
1168 struct mbuf *mp;
1169 int len = count * sizeof(*bus);
1170 int offp;
1171
1172 PFSYNC_BLOCK(sc);
1173
1174 /* If we're not waiting for a bulk update, who cares. */
1175 if (sc->sc_ureq_sent == 0) {
1176 PFSYNC_BUNLOCK(sc);
1177 return (len);
1178 }
1179
1180 mp = m_pulldown(m, offset, len, &offp);
1181 if (mp == NULL) {
1182 PFSYNC_BUNLOCK(sc);
1183 V_pfsyncstats.pfsyncs_badlen++;
1184 return (-1);
1185 }
1186 bus = (struct pfsync_bus *)(mp->m_data + offp);
1187
1188 switch (bus->status) {
1189 case PFSYNC_BUS_START:
1190 callout_reset(&sc->sc_bulkfail_tmo, 4 * hz +
1191 V_pf_limits[PF_LIMIT_STATES].limit /
1192 ((sc->sc_ifp->if_mtu - PFSYNC_MINPKT) /
1193 sizeof(struct pfsync_state)),
1194 pfsync_bulk_fail, sc);
1195 if (V_pf_status.debug >= PF_DEBUG_MISC)
1196 printf("pfsync: received bulk update start\n");
1197 break;
1198
1199 case PFSYNC_BUS_END:
1200 if (time_uptime - ntohl(bus->endtime) >=
1201 sc->sc_ureq_sent) {
1202 /* that's it, we're happy */
1203 sc->sc_ureq_sent = 0;
1204 sc->sc_bulk_tries = 0;
1205 callout_stop(&sc->sc_bulkfail_tmo);
1206 if (!(sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p)
1207 (*carp_demote_adj_p)(-V_pfsync_carp_adj,
1208 "pfsync bulk done");
1209 sc->sc_flags |= PFSYNCF_OK;
1210 if (V_pf_status.debug >= PF_DEBUG_MISC)
1211 printf("pfsync: received valid "
1212 "bulk update end\n");
1213 } else {
1214 if (V_pf_status.debug >= PF_DEBUG_MISC)
1215 printf("pfsync: received invalid "
1216 "bulk update end: bad timestamp\n");
1217 }
1218 break;
1219 }
1220 PFSYNC_BUNLOCK(sc);
1221
1222 return (len);
1223 }
1224
1225 static int
pfsync_in_tdb(struct pfsync_pkt * pkt,struct mbuf * m,int offset,int count)1226 pfsync_in_tdb(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
1227 {
1228 int len = count * sizeof(struct pfsync_tdb);
1229
1230 #if defined(IPSEC)
1231 struct pfsync_tdb *tp;
1232 struct mbuf *mp;
1233 int offp;
1234 int i;
1235 int s;
1236
1237 mp = m_pulldown(m, offset, len, &offp);
1238 if (mp == NULL) {
1239 V_pfsyncstats.pfsyncs_badlen++;
1240 return (-1);
1241 }
1242 tp = (struct pfsync_tdb *)(mp->m_data + offp);
1243
1244 for (i = 0; i < count; i++)
1245 pfsync_update_net_tdb(&tp[i]);
1246 #endif
1247
1248 return (len);
1249 }
1250
1251 #if defined(IPSEC)
1252 /* Update an in-kernel tdb. Silently fail if no tdb is found. */
1253 static void
pfsync_update_net_tdb(struct pfsync_tdb * pt)1254 pfsync_update_net_tdb(struct pfsync_tdb *pt)
1255 {
1256 struct tdb *tdb;
1257 int s;
1258
1259 /* check for invalid values */
1260 if (ntohl(pt->spi) <= SPI_RESERVED_MAX ||
1261 (pt->dst.sa.sa_family != AF_INET &&
1262 pt->dst.sa.sa_family != AF_INET6))
1263 goto bad;
1264
1265 tdb = gettdb(pt->spi, &pt->dst, pt->sproto);
1266 if (tdb) {
1267 pt->rpl = ntohl(pt->rpl);
1268 pt->cur_bytes = (unsigned long long)be64toh(pt->cur_bytes);
1269
1270 /* Neither replay nor byte counter should ever decrease. */
1271 if (pt->rpl < tdb->tdb_rpl ||
1272 pt->cur_bytes < tdb->tdb_cur_bytes) {
1273 goto bad;
1274 }
1275
1276 tdb->tdb_rpl = pt->rpl;
1277 tdb->tdb_cur_bytes = pt->cur_bytes;
1278 }
1279 return;
1280
1281 bad:
1282 if (V_pf_status.debug >= PF_DEBUG_MISC)
1283 printf("pfsync_insert: PFSYNC_ACT_TDB_UPD: "
1284 "invalid value\n");
1285 V_pfsyncstats.pfsyncs_badstate++;
1286 return;
1287 }
1288 #endif
1289
1290
1291 static int
pfsync_in_eof(struct pfsync_pkt * pkt,struct mbuf * m,int offset,int count)1292 pfsync_in_eof(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
1293 {
1294 /* check if we are at the right place in the packet */
1295 if (offset != m->m_pkthdr.len)
1296 V_pfsyncstats.pfsyncs_badlen++;
1297
1298 /* we're done. free and let the caller return */
1299 m_freem(m);
1300 return (-1);
1301 }
1302
1303 static int
pfsync_in_error(struct pfsync_pkt * pkt,struct mbuf * m,int offset,int count)1304 pfsync_in_error(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
1305 {
1306 V_pfsyncstats.pfsyncs_badact++;
1307
1308 m_freem(m);
1309 return (-1);
1310 }
1311
1312 static int
pfsyncoutput(struct ifnet * ifp,struct mbuf * m,const struct sockaddr * dst,struct route * rt)1313 pfsyncoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
1314 struct route *rt)
1315 {
1316 m_freem(m);
1317 return (0);
1318 }
1319
1320 /* ARGSUSED */
1321 static int
pfsyncioctl(struct ifnet * ifp,u_long cmd,caddr_t data)1322 pfsyncioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
1323 {
1324 struct pfsync_softc *sc = ifp->if_softc;
1325 struct ifreq *ifr = (struct ifreq *)data;
1326 struct pfsyncreq pfsyncr;
1327 int error;
1328 int c;
1329
1330 switch (cmd) {
1331 case SIOCSIFFLAGS:
1332 PFSYNC_LOCK(sc);
1333 if (ifp->if_flags & IFF_UP) {
1334 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1335 PFSYNC_UNLOCK(sc);
1336 pfsync_pointers_init();
1337 } else {
1338 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1339 PFSYNC_UNLOCK(sc);
1340 pfsync_pointers_uninit();
1341 }
1342 break;
1343 case SIOCSIFMTU:
1344 if (!sc->sc_sync_if ||
1345 ifr->ifr_mtu <= PFSYNC_MINPKT ||
1346 ifr->ifr_mtu > sc->sc_sync_if->if_mtu)
1347 return (EINVAL);
1348 if (ifr->ifr_mtu < ifp->if_mtu) {
1349 for (c = 0; c < pfsync_buckets; c++) {
1350 PFSYNC_BUCKET_LOCK(&sc->sc_buckets[c]);
1351 if (sc->sc_buckets[c].b_len > PFSYNC_MINPKT)
1352 pfsync_sendout(1, c);
1353 PFSYNC_BUCKET_UNLOCK(&sc->sc_buckets[c]);
1354 }
1355 }
1356 ifp->if_mtu = ifr->ifr_mtu;
1357 break;
1358 case SIOCGETPFSYNC:
1359 bzero(&pfsyncr, sizeof(pfsyncr));
1360 PFSYNC_LOCK(sc);
1361 if (sc->sc_sync_if) {
1362 strlcpy(pfsyncr.pfsyncr_syncdev,
1363 sc->sc_sync_if->if_xname, IFNAMSIZ);
1364 }
1365 pfsyncr.pfsyncr_syncpeer = sc->sc_sync_peer;
1366 pfsyncr.pfsyncr_maxupdates = sc->sc_maxupdates;
1367 pfsyncr.pfsyncr_defer = (PFSYNCF_DEFER ==
1368 (sc->sc_flags & PFSYNCF_DEFER));
1369 PFSYNC_UNLOCK(sc);
1370 return (copyout(&pfsyncr, ifr_data_get_ptr(ifr),
1371 sizeof(pfsyncr)));
1372
1373 case SIOCSETPFSYNC:
1374 {
1375 struct in_mfilter *imf = NULL;
1376 struct ifnet *sifp;
1377 struct ip *ip;
1378
1379 if ((error = priv_check(curthread, PRIV_NETINET_PF)) != 0)
1380 return (error);
1381 if ((error = copyin(ifr_data_get_ptr(ifr), &pfsyncr,
1382 sizeof(pfsyncr))))
1383 return (error);
1384
1385 if (pfsyncr.pfsyncr_maxupdates > 255)
1386 return (EINVAL);
1387
1388 if (pfsyncr.pfsyncr_syncdev[0] == 0)
1389 sifp = NULL;
1390 else if ((sifp = ifunit_ref(pfsyncr.pfsyncr_syncdev)) == NULL)
1391 return (EINVAL);
1392
1393 if (sifp != NULL && (
1394 pfsyncr.pfsyncr_syncpeer.s_addr == 0 ||
1395 pfsyncr.pfsyncr_syncpeer.s_addr ==
1396 htonl(INADDR_PFSYNC_GROUP)))
1397 imf = ip_mfilter_alloc(M_WAITOK, 0, 0);
1398
1399 PFSYNC_LOCK(sc);
1400 if (pfsyncr.pfsyncr_syncpeer.s_addr == 0)
1401 sc->sc_sync_peer.s_addr = htonl(INADDR_PFSYNC_GROUP);
1402 else
1403 sc->sc_sync_peer.s_addr =
1404 pfsyncr.pfsyncr_syncpeer.s_addr;
1405
1406 sc->sc_maxupdates = pfsyncr.pfsyncr_maxupdates;
1407 if (pfsyncr.pfsyncr_defer) {
1408 sc->sc_flags |= PFSYNCF_DEFER;
1409 V_pfsync_defer_ptr = pfsync_defer;
1410 } else {
1411 sc->sc_flags &= ~PFSYNCF_DEFER;
1412 V_pfsync_defer_ptr = NULL;
1413 }
1414
1415 if (sifp == NULL) {
1416 if (sc->sc_sync_if)
1417 if_rele(sc->sc_sync_if);
1418 sc->sc_sync_if = NULL;
1419 pfsync_multicast_cleanup(sc);
1420 PFSYNC_UNLOCK(sc);
1421 break;
1422 }
1423
1424 for (c = 0; c < pfsync_buckets; c++) {
1425 PFSYNC_BUCKET_LOCK(&sc->sc_buckets[c]);
1426 if (sc->sc_buckets[c].b_len > PFSYNC_MINPKT &&
1427 (sifp->if_mtu < sc->sc_ifp->if_mtu ||
1428 (sc->sc_sync_if != NULL &&
1429 sifp->if_mtu < sc->sc_sync_if->if_mtu) ||
1430 sifp->if_mtu < MCLBYTES - sizeof(struct ip)))
1431 pfsync_sendout(1, c);
1432 PFSYNC_BUCKET_UNLOCK(&sc->sc_buckets[c]);
1433 }
1434
1435 pfsync_multicast_cleanup(sc);
1436
1437 if (sc->sc_sync_peer.s_addr == htonl(INADDR_PFSYNC_GROUP)) {
1438 error = pfsync_multicast_setup(sc, sifp, imf);
1439 if (error) {
1440 if_rele(sifp);
1441 ip_mfilter_free(imf);
1442 PFSYNC_UNLOCK(sc);
1443 return (error);
1444 }
1445 }
1446 if (sc->sc_sync_if)
1447 if_rele(sc->sc_sync_if);
1448 sc->sc_sync_if = sifp;
1449
1450 ip = &sc->sc_template;
1451 bzero(ip, sizeof(*ip));
1452 ip->ip_v = IPVERSION;
1453 ip->ip_hl = sizeof(sc->sc_template) >> 2;
1454 ip->ip_tos = IPTOS_LOWDELAY;
1455 /* len and id are set later. */
1456 ip->ip_off = htons(IP_DF);
1457 ip->ip_ttl = PFSYNC_DFLTTL;
1458 ip->ip_p = IPPROTO_PFSYNC;
1459 ip->ip_src.s_addr = INADDR_ANY;
1460 ip->ip_dst.s_addr = sc->sc_sync_peer.s_addr;
1461
1462 /* Request a full state table update. */
1463 if ((sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p)
1464 (*carp_demote_adj_p)(V_pfsync_carp_adj,
1465 "pfsync bulk start");
1466 sc->sc_flags &= ~PFSYNCF_OK;
1467 if (V_pf_status.debug >= PF_DEBUG_MISC)
1468 printf("pfsync: requesting bulk update\n");
1469 PFSYNC_UNLOCK(sc);
1470 PFSYNC_BUCKET_LOCK(&sc->sc_buckets[0]);
1471 pfsync_request_update(0, 0);
1472 PFSYNC_BUCKET_UNLOCK(&sc->sc_buckets[0]);
1473 PFSYNC_BLOCK(sc);
1474 sc->sc_ureq_sent = time_uptime;
1475 callout_reset(&sc->sc_bulkfail_tmo, 5 * hz, pfsync_bulk_fail,
1476 sc);
1477 PFSYNC_BUNLOCK(sc);
1478
1479 break;
1480 }
1481 default:
1482 return (ENOTTY);
1483 }
1484
1485 return (0);
1486 }
1487
1488 static void
pfsync_out_state(struct pf_state * st,void * buf)1489 pfsync_out_state(struct pf_state *st, void *buf)
1490 {
1491 struct pfsync_state *sp = buf;
1492
1493 pfsync_state_export(sp, st);
1494 }
1495
1496 static void
pfsync_out_iack(struct pf_state * st,void * buf)1497 pfsync_out_iack(struct pf_state *st, void *buf)
1498 {
1499 struct pfsync_ins_ack *iack = buf;
1500
1501 iack->id = st->id;
1502 iack->creatorid = st->creatorid;
1503 }
1504
1505 static void
pfsync_out_upd_c(struct pf_state * st,void * buf)1506 pfsync_out_upd_c(struct pf_state *st, void *buf)
1507 {
1508 struct pfsync_upd_c *up = buf;
1509
1510 bzero(up, sizeof(*up));
1511 up->id = st->id;
1512 pf_state_peer_hton(&st->src, &up->src);
1513 pf_state_peer_hton(&st->dst, &up->dst);
1514 up->creatorid = st->creatorid;
1515 up->timeout = st->timeout;
1516 }
1517
1518 static void
pfsync_out_del(struct pf_state * st,void * buf)1519 pfsync_out_del(struct pf_state *st, void *buf)
1520 {
1521 struct pfsync_del_c *dp = buf;
1522
1523 dp->id = st->id;
1524 dp->creatorid = st->creatorid;
1525 st->state_flags |= PFSTATE_NOSYNC;
1526 }
1527
1528 static void
pfsync_drop(struct pfsync_softc * sc)1529 pfsync_drop(struct pfsync_softc *sc)
1530 {
1531 struct pf_state *st, *next;
1532 struct pfsync_upd_req_item *ur;
1533 struct pfsync_bucket *b;
1534 int c, q;
1535
1536 for (c = 0; c < pfsync_buckets; c++) {
1537 b = &sc->sc_buckets[c];
1538 for (q = 0; q < PFSYNC_S_COUNT; q++) {
1539 if (TAILQ_EMPTY(&b->b_qs[q]))
1540 continue;
1541
1542 TAILQ_FOREACH_SAFE(st, &b->b_qs[q], sync_list, next) {
1543 KASSERT(st->sync_state == q,
1544 ("%s: st->sync_state == q",
1545 __func__));
1546 st->sync_state = PFSYNC_S_NONE;
1547 pf_release_state(st);
1548 }
1549 TAILQ_INIT(&b->b_qs[q]);
1550 }
1551
1552 while ((ur = TAILQ_FIRST(&b->b_upd_req_list)) != NULL) {
1553 TAILQ_REMOVE(&b->b_upd_req_list, ur, ur_entry);
1554 free(ur, M_PFSYNC);
1555 }
1556
1557 b->b_len = PFSYNC_MINPKT;
1558 b->b_plus = NULL;
1559 }
1560 }
1561
1562 static void
pfsync_sendout(int schedswi,int c)1563 pfsync_sendout(int schedswi, int c)
1564 {
1565 struct pfsync_softc *sc = V_pfsyncif;
1566 struct ifnet *ifp = sc->sc_ifp;
1567 struct mbuf *m;
1568 struct ip *ip;
1569 struct pfsync_header *ph;
1570 struct pfsync_subheader *subh;
1571 struct pf_state *st, *st_next;
1572 struct pfsync_upd_req_item *ur;
1573 struct pfsync_bucket *b = &sc->sc_buckets[c];
1574 int offset;
1575 int q, count = 0;
1576
1577 KASSERT(sc != NULL, ("%s: null sc", __func__));
1578 KASSERT(b->b_len > PFSYNC_MINPKT,
1579 ("%s: sc_len %zu", __func__, b->b_len));
1580 PFSYNC_BUCKET_LOCK_ASSERT(b);
1581
1582 if (ifp->if_bpf == NULL && sc->sc_sync_if == NULL) {
1583 pfsync_drop(sc);
1584 return;
1585 }
1586
1587 m = m_get2(max_linkhdr + b->b_len, M_NOWAIT, MT_DATA, M_PKTHDR);
1588 if (m == NULL) {
1589 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
1590 V_pfsyncstats.pfsyncs_onomem++;
1591 return;
1592 }
1593 m->m_data += max_linkhdr;
1594 m->m_len = m->m_pkthdr.len = b->b_len;
1595
1596 /* build the ip header */
1597 ip = (struct ip *)m->m_data;
1598 bcopy(&sc->sc_template, ip, sizeof(*ip));
1599 offset = sizeof(*ip);
1600
1601 ip->ip_len = htons(m->m_pkthdr.len);
1602 ip_fillid(ip);
1603
1604 /* build the pfsync header */
1605 ph = (struct pfsync_header *)(m->m_data + offset);
1606 bzero(ph, sizeof(*ph));
1607 offset += sizeof(*ph);
1608
1609 ph->version = PFSYNC_VERSION;
1610 ph->len = htons(b->b_len - sizeof(*ip));
1611 bcopy(V_pf_status.pf_chksum, ph->pfcksum, PF_MD5_DIGEST_LENGTH);
1612
1613 /* walk the queues */
1614 for (q = 0; q < PFSYNC_S_COUNT; q++) {
1615 if (TAILQ_EMPTY(&b->b_qs[q]))
1616 continue;
1617
1618 subh = (struct pfsync_subheader *)(m->m_data + offset);
1619 offset += sizeof(*subh);
1620
1621 count = 0;
1622 TAILQ_FOREACH_SAFE(st, &b->b_qs[q], sync_list, st_next) {
1623 KASSERT(st->sync_state == q,
1624 ("%s: st->sync_state == q",
1625 __func__));
1626 /*
1627 * XXXGL: some of write methods do unlocked reads
1628 * of state data :(
1629 */
1630 pfsync_qs[q].write(st, m->m_data + offset);
1631 offset += pfsync_qs[q].len;
1632 st->sync_state = PFSYNC_S_NONE;
1633 pf_release_state(st);
1634 count++;
1635 }
1636 TAILQ_INIT(&b->b_qs[q]);
1637
1638 bzero(subh, sizeof(*subh));
1639 subh->action = pfsync_qs[q].action;
1640 subh->count = htons(count);
1641 V_pfsyncstats.pfsyncs_oacts[pfsync_qs[q].action] += count;
1642 }
1643
1644 if (!TAILQ_EMPTY(&b->b_upd_req_list)) {
1645 subh = (struct pfsync_subheader *)(m->m_data + offset);
1646 offset += sizeof(*subh);
1647
1648 count = 0;
1649 while ((ur = TAILQ_FIRST(&b->b_upd_req_list)) != NULL) {
1650 TAILQ_REMOVE(&b->b_upd_req_list, ur, ur_entry);
1651
1652 bcopy(&ur->ur_msg, m->m_data + offset,
1653 sizeof(ur->ur_msg));
1654 offset += sizeof(ur->ur_msg);
1655 free(ur, M_PFSYNC);
1656 count++;
1657 }
1658
1659 bzero(subh, sizeof(*subh));
1660 subh->action = PFSYNC_ACT_UPD_REQ;
1661 subh->count = htons(count);
1662 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_UPD_REQ] += count;
1663 }
1664
1665 /* has someone built a custom region for us to add? */
1666 if (b->b_plus != NULL) {
1667 bcopy(b->b_plus, m->m_data + offset, b->b_pluslen);
1668 offset += b->b_pluslen;
1669
1670 b->b_plus = NULL;
1671 }
1672
1673 subh = (struct pfsync_subheader *)(m->m_data + offset);
1674 offset += sizeof(*subh);
1675
1676 bzero(subh, sizeof(*subh));
1677 subh->action = PFSYNC_ACT_EOF;
1678 subh->count = htons(1);
1679 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_EOF]++;
1680
1681 /* we're done, let's put it on the wire */
1682 if (ifp->if_bpf) {
1683 m->m_data += sizeof(*ip);
1684 m->m_len = m->m_pkthdr.len = b->b_len - sizeof(*ip);
1685 BPF_MTAP(ifp, m);
1686 m->m_data -= sizeof(*ip);
1687 m->m_len = m->m_pkthdr.len = b->b_len;
1688 }
1689
1690 if (sc->sc_sync_if == NULL) {
1691 b->b_len = PFSYNC_MINPKT;
1692 m_freem(m);
1693 return;
1694 }
1695
1696 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1);
1697 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len);
1698 b->b_len = PFSYNC_MINPKT;
1699
1700 if (!_IF_QFULL(&b->b_snd))
1701 _IF_ENQUEUE(&b->b_snd, m);
1702 else {
1703 m_freem(m);
1704 if_inc_counter(sc->sc_ifp, IFCOUNTER_OQDROPS, 1);
1705 }
1706 if (schedswi)
1707 swi_sched(V_pfsync_swi_cookie, 0);
1708 }
1709
1710 static void
pfsync_insert_state(struct pf_state * st)1711 pfsync_insert_state(struct pf_state *st)
1712 {
1713 struct pfsync_softc *sc = V_pfsyncif;
1714 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
1715
1716 if (st->state_flags & PFSTATE_NOSYNC)
1717 return;
1718
1719 if ((st->rule.ptr->rule_flag & PFRULE_NOSYNC) ||
1720 st->key[PF_SK_WIRE]->proto == IPPROTO_PFSYNC) {
1721 st->state_flags |= PFSTATE_NOSYNC;
1722 return;
1723 }
1724
1725 KASSERT(st->sync_state == PFSYNC_S_NONE,
1726 ("%s: st->sync_state %u", __func__, st->sync_state));
1727
1728 PFSYNC_BUCKET_LOCK(b);
1729 if (b->b_len == PFSYNC_MINPKT)
1730 callout_reset(&b->b_tmo, 1 * hz, pfsync_timeout, b);
1731
1732 pfsync_q_ins(st, PFSYNC_S_INS, true);
1733 PFSYNC_BUCKET_UNLOCK(b);
1734
1735 st->sync_updates = 0;
1736 }
1737
1738 static int
pfsync_defer(struct pf_state * st,struct mbuf * m)1739 pfsync_defer(struct pf_state *st, struct mbuf *m)
1740 {
1741 struct pfsync_softc *sc = V_pfsyncif;
1742 struct pfsync_deferral *pd;
1743 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
1744
1745 if (m->m_flags & (M_BCAST|M_MCAST))
1746 return (0);
1747
1748 PFSYNC_LOCK(sc);
1749
1750 if (sc == NULL || !(sc->sc_ifp->if_flags & IFF_DRV_RUNNING) ||
1751 !(sc->sc_flags & PFSYNCF_DEFER)) {
1752 PFSYNC_UNLOCK(sc);
1753 return (0);
1754 }
1755
1756 if (b->b_deferred >= 128)
1757 pfsync_undefer(TAILQ_FIRST(&b->b_deferrals), 0);
1758
1759 pd = malloc(sizeof(*pd), M_PFSYNC, M_NOWAIT);
1760 if (pd == NULL)
1761 return (0);
1762 b->b_deferred++;
1763
1764 m->m_flags |= M_SKIP_FIREWALL;
1765 st->state_flags |= PFSTATE_ACK;
1766
1767 pd->pd_sc = sc;
1768 pd->pd_refs = 0;
1769 pd->pd_st = st;
1770 pf_ref_state(st);
1771 pd->pd_m = m;
1772
1773 TAILQ_INSERT_TAIL(&b->b_deferrals, pd, pd_entry);
1774 callout_init_mtx(&pd->pd_tmo, &b->b_mtx, CALLOUT_RETURNUNLOCKED);
1775 callout_reset(&pd->pd_tmo, 10, pfsync_defer_tmo, pd);
1776
1777 pfsync_push(b);
1778
1779 return (1);
1780 }
1781
1782 static void
pfsync_undefer(struct pfsync_deferral * pd,int drop)1783 pfsync_undefer(struct pfsync_deferral *pd, int drop)
1784 {
1785 struct pfsync_softc *sc = pd->pd_sc;
1786 struct mbuf *m = pd->pd_m;
1787 struct pf_state *st = pd->pd_st;
1788 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
1789
1790 PFSYNC_BUCKET_LOCK_ASSERT(b);
1791
1792 TAILQ_REMOVE(&b->b_deferrals, pd, pd_entry);
1793 b->b_deferred--;
1794 pd->pd_st->state_flags &= ~PFSTATE_ACK; /* XXX: locking! */
1795 free(pd, M_PFSYNC);
1796 pf_release_state(st);
1797
1798 if (drop)
1799 m_freem(m);
1800 else {
1801 _IF_ENQUEUE(&b->b_snd, m);
1802 pfsync_push(b);
1803 }
1804 }
1805
1806 static void
pfsync_defer_tmo(void * arg)1807 pfsync_defer_tmo(void *arg)
1808 {
1809 struct pfsync_deferral *pd = arg;
1810 struct pfsync_softc *sc = pd->pd_sc;
1811 struct mbuf *m = pd->pd_m;
1812 struct pf_state *st = pd->pd_st;
1813 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
1814
1815 PFSYNC_BUCKET_LOCK_ASSERT(b);
1816
1817 CURVNET_SET(m->m_pkthdr.rcvif->if_vnet);
1818
1819 TAILQ_REMOVE(&b->b_deferrals, pd, pd_entry);
1820 b->b_deferred--;
1821 pd->pd_st->state_flags &= ~PFSTATE_ACK; /* XXX: locking! */
1822 if (pd->pd_refs == 0)
1823 free(pd, M_PFSYNC);
1824 PFSYNC_UNLOCK(sc);
1825
1826 ip_output(m, NULL, NULL, 0, NULL, NULL);
1827
1828 pf_release_state(st);
1829
1830 CURVNET_RESTORE();
1831 }
1832
1833 static void
pfsync_undefer_state(struct pf_state * st,int drop)1834 pfsync_undefer_state(struct pf_state *st, int drop)
1835 {
1836 struct pfsync_softc *sc = V_pfsyncif;
1837 struct pfsync_deferral *pd;
1838 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
1839
1840 PFSYNC_BUCKET_LOCK(b);
1841
1842 TAILQ_FOREACH(pd, &b->b_deferrals, pd_entry) {
1843 if (pd->pd_st == st) {
1844 if (callout_stop(&pd->pd_tmo) > 0)
1845 pfsync_undefer(pd, drop);
1846
1847 PFSYNC_BUCKET_UNLOCK(b);
1848 return;
1849 }
1850 }
1851 PFSYNC_BUCKET_UNLOCK(b);
1852
1853 panic("%s: unable to find deferred state", __func__);
1854 }
1855
1856 static struct pfsync_bucket*
pfsync_get_bucket(struct pfsync_softc * sc,struct pf_state * st)1857 pfsync_get_bucket(struct pfsync_softc *sc, struct pf_state *st)
1858 {
1859 int c = PF_IDHASH(st) % pfsync_buckets;
1860 return &sc->sc_buckets[c];
1861 }
1862
1863 static void
pfsync_update_state(struct pf_state * st)1864 pfsync_update_state(struct pf_state *st)
1865 {
1866 struct pfsync_softc *sc = V_pfsyncif;
1867 bool sync = false, ref = true;
1868 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
1869
1870 PF_STATE_LOCK_ASSERT(st);
1871 PFSYNC_BUCKET_LOCK(b);
1872
1873 if (st->state_flags & PFSTATE_ACK)
1874 pfsync_undefer_state(st, 0);
1875 if (st->state_flags & PFSTATE_NOSYNC) {
1876 if (st->sync_state != PFSYNC_S_NONE)
1877 pfsync_q_del(st, true, b);
1878 PFSYNC_BUCKET_UNLOCK(b);
1879 return;
1880 }
1881
1882 if (b->b_len == PFSYNC_MINPKT)
1883 callout_reset(&b->b_tmo, 1 * hz, pfsync_timeout, b);
1884
1885 switch (st->sync_state) {
1886 case PFSYNC_S_UPD_C:
1887 case PFSYNC_S_UPD:
1888 case PFSYNC_S_INS:
1889 /* we're already handling it */
1890
1891 if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP) {
1892 st->sync_updates++;
1893 if (st->sync_updates >= sc->sc_maxupdates)
1894 sync = true;
1895 }
1896 break;
1897
1898 case PFSYNC_S_IACK:
1899 pfsync_q_del(st, false, b);
1900 ref = false;
1901 /* FALLTHROUGH */
1902
1903 case PFSYNC_S_NONE:
1904 pfsync_q_ins(st, PFSYNC_S_UPD_C, ref);
1905 st->sync_updates = 0;
1906 break;
1907
1908 default:
1909 panic("%s: unexpected sync state %d", __func__, st->sync_state);
1910 }
1911
1912 if (sync || (time_uptime - st->pfsync_time) < 2)
1913 pfsync_push(b);
1914
1915 PFSYNC_BUCKET_UNLOCK(b);
1916 }
1917
1918 static void
pfsync_request_update(u_int32_t creatorid,u_int64_t id)1919 pfsync_request_update(u_int32_t creatorid, u_int64_t id)
1920 {
1921 struct pfsync_softc *sc = V_pfsyncif;
1922 struct pfsync_bucket *b = &sc->sc_buckets[0];
1923 struct pfsync_upd_req_item *item;
1924 size_t nlen = sizeof(struct pfsync_upd_req);
1925
1926 PFSYNC_BUCKET_LOCK_ASSERT(b);
1927
1928 /*
1929 * This code does a bit to prevent multiple update requests for the
1930 * same state being generated. It searches current subheader queue,
1931 * but it doesn't lookup into queue of already packed datagrams.
1932 */
1933 TAILQ_FOREACH(item, &b->b_upd_req_list, ur_entry)
1934 if (item->ur_msg.id == id &&
1935 item->ur_msg.creatorid == creatorid)
1936 return;
1937
1938 item = malloc(sizeof(*item), M_PFSYNC, M_NOWAIT);
1939 if (item == NULL)
1940 return; /* XXX stats */
1941
1942 item->ur_msg.id = id;
1943 item->ur_msg.creatorid = creatorid;
1944
1945 if (TAILQ_EMPTY(&b->b_upd_req_list))
1946 nlen += sizeof(struct pfsync_subheader);
1947
1948 if (b->b_len + nlen > sc->sc_ifp->if_mtu) {
1949 pfsync_sendout(1, 0);
1950
1951 nlen = sizeof(struct pfsync_subheader) +
1952 sizeof(struct pfsync_upd_req);
1953 }
1954
1955 TAILQ_INSERT_TAIL(&b->b_upd_req_list, item, ur_entry);
1956 b->b_len += nlen;
1957 }
1958
1959 static bool
pfsync_update_state_req(struct pf_state * st)1960 pfsync_update_state_req(struct pf_state *st)
1961 {
1962 struct pfsync_softc *sc = V_pfsyncif;
1963 bool ref = true, full = false;
1964 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
1965
1966 PF_STATE_LOCK_ASSERT(st);
1967 PFSYNC_BUCKET_LOCK(b);
1968
1969 if (st->state_flags & PFSTATE_NOSYNC) {
1970 if (st->sync_state != PFSYNC_S_NONE)
1971 pfsync_q_del(st, true, b);
1972 PFSYNC_BUCKET_UNLOCK(b);
1973 return (full);
1974 }
1975
1976 switch (st->sync_state) {
1977 case PFSYNC_S_UPD_C:
1978 case PFSYNC_S_IACK:
1979 pfsync_q_del(st, false, b);
1980 ref = false;
1981 /* FALLTHROUGH */
1982
1983 case PFSYNC_S_NONE:
1984 pfsync_q_ins(st, PFSYNC_S_UPD, ref);
1985 pfsync_push(b);
1986 break;
1987
1988 case PFSYNC_S_INS:
1989 case PFSYNC_S_UPD:
1990 case PFSYNC_S_DEL:
1991 /* we're already handling it */
1992 break;
1993
1994 default:
1995 panic("%s: unexpected sync state %d", __func__, st->sync_state);
1996 }
1997
1998 if ((sc->sc_ifp->if_mtu - b->b_len) < sizeof(struct pfsync_state))
1999 full = true;
2000
2001 PFSYNC_BUCKET_UNLOCK(b);
2002
2003 return (full);
2004 }
2005
2006 static void
pfsync_delete_state(struct pf_state * st)2007 pfsync_delete_state(struct pf_state *st)
2008 {
2009 struct pfsync_softc *sc = V_pfsyncif;
2010 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
2011 bool ref = true;
2012
2013 PFSYNC_BUCKET_LOCK(b);
2014 if (st->state_flags & PFSTATE_ACK)
2015 pfsync_undefer_state(st, 1);
2016 if (st->state_flags & PFSTATE_NOSYNC) {
2017 if (st->sync_state != PFSYNC_S_NONE)
2018 pfsync_q_del(st, true, b);
2019 PFSYNC_BUCKET_UNLOCK(b);
2020 return;
2021 }
2022
2023 if (b->b_len == PFSYNC_MINPKT)
2024 callout_reset(&b->b_tmo, 1 * hz, pfsync_timeout, b);
2025
2026 switch (st->sync_state) {
2027 case PFSYNC_S_INS:
2028 /* We never got to tell the world so just forget about it. */
2029 pfsync_q_del(st, true, b);
2030 break;
2031
2032 case PFSYNC_S_UPD_C:
2033 case PFSYNC_S_UPD:
2034 case PFSYNC_S_IACK:
2035 pfsync_q_del(st, false, b);
2036 ref = false;
2037 /* FALLTHROUGH */
2038
2039 case PFSYNC_S_NONE:
2040 pfsync_q_ins(st, PFSYNC_S_DEL, ref);
2041 break;
2042
2043 default:
2044 panic("%s: unexpected sync state %d", __func__, st->sync_state);
2045 }
2046
2047 PFSYNC_BUCKET_UNLOCK(b);
2048 }
2049
2050 static void
pfsync_clear_states(u_int32_t creatorid,const char * ifname)2051 pfsync_clear_states(u_int32_t creatorid, const char *ifname)
2052 {
2053 struct {
2054 struct pfsync_subheader subh;
2055 struct pfsync_clr clr;
2056 } __packed r;
2057
2058 bzero(&r, sizeof(r));
2059
2060 r.subh.action = PFSYNC_ACT_CLR;
2061 r.subh.count = htons(1);
2062 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_CLR]++;
2063
2064 strlcpy(r.clr.ifname, ifname, sizeof(r.clr.ifname));
2065 r.clr.creatorid = creatorid;
2066
2067 pfsync_send_plus(&r, sizeof(r));
2068 }
2069
2070 static void
pfsync_q_ins(struct pf_state * st,int q,bool ref)2071 pfsync_q_ins(struct pf_state *st, int q, bool ref)
2072 {
2073 struct pfsync_softc *sc = V_pfsyncif;
2074 size_t nlen = pfsync_qs[q].len;
2075 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
2076
2077 PFSYNC_BUCKET_LOCK_ASSERT(b);
2078
2079 KASSERT(st->sync_state == PFSYNC_S_NONE,
2080 ("%s: st->sync_state %u", __func__, st->sync_state));
2081 KASSERT(b->b_len >= PFSYNC_MINPKT, ("pfsync pkt len is too low %zu",
2082 b->b_len));
2083
2084 if (TAILQ_EMPTY(&b->b_qs[q]))
2085 nlen += sizeof(struct pfsync_subheader);
2086
2087 if (b->b_len + nlen > sc->sc_ifp->if_mtu) {
2088 pfsync_sendout(1, b->b_id);
2089
2090 nlen = sizeof(struct pfsync_subheader) + pfsync_qs[q].len;
2091 }
2092
2093 b->b_len += nlen;
2094 TAILQ_INSERT_TAIL(&b->b_qs[q], st, sync_list);
2095 st->sync_state = q;
2096 if (ref)
2097 pf_ref_state(st);
2098 }
2099
2100 static void
pfsync_q_del(struct pf_state * st,bool unref,struct pfsync_bucket * b)2101 pfsync_q_del(struct pf_state *st, bool unref, struct pfsync_bucket *b)
2102 {
2103 int q = st->sync_state;
2104
2105 PFSYNC_BUCKET_LOCK_ASSERT(b);
2106 KASSERT(st->sync_state != PFSYNC_S_NONE,
2107 ("%s: st->sync_state != PFSYNC_S_NONE", __func__));
2108
2109 b->b_len -= pfsync_qs[q].len;
2110 TAILQ_REMOVE(&b->b_qs[q], st, sync_list);
2111 st->sync_state = PFSYNC_S_NONE;
2112 if (unref)
2113 pf_release_state(st);
2114
2115 if (TAILQ_EMPTY(&b->b_qs[q]))
2116 b->b_len -= sizeof(struct pfsync_subheader);
2117 }
2118
2119 static void
pfsync_bulk_start(void)2120 pfsync_bulk_start(void)
2121 {
2122 struct pfsync_softc *sc = V_pfsyncif;
2123
2124 if (V_pf_status.debug >= PF_DEBUG_MISC)
2125 printf("pfsync: received bulk update request\n");
2126
2127 PFSYNC_BLOCK(sc);
2128
2129 sc->sc_ureq_received = time_uptime;
2130 sc->sc_bulk_hashid = 0;
2131 sc->sc_bulk_stateid = 0;
2132 pfsync_bulk_status(PFSYNC_BUS_START);
2133 callout_reset(&sc->sc_bulk_tmo, 1, pfsync_bulk_update, sc);
2134 PFSYNC_BUNLOCK(sc);
2135 }
2136
2137 static void
pfsync_bulk_update(void * arg)2138 pfsync_bulk_update(void *arg)
2139 {
2140 struct pfsync_softc *sc = arg;
2141 struct pf_state *s;
2142 int i, sent = 0;
2143
2144 PFSYNC_BLOCK_ASSERT(sc);
2145 CURVNET_SET(sc->sc_ifp->if_vnet);
2146
2147 /*
2148 * Start with last state from previous invocation.
2149 * It may had gone, in this case start from the
2150 * hash slot.
2151 */
2152 s = pf_find_state_byid(sc->sc_bulk_stateid, sc->sc_bulk_creatorid);
2153
2154 if (s != NULL)
2155 i = PF_IDHASH(s);
2156 else
2157 i = sc->sc_bulk_hashid;
2158
2159 for (; i <= pf_hashmask; i++) {
2160 struct pf_idhash *ih = &V_pf_idhash[i];
2161
2162 if (s != NULL)
2163 PF_HASHROW_ASSERT(ih);
2164 else {
2165 PF_HASHROW_LOCK(ih);
2166 s = LIST_FIRST(&ih->states);
2167 }
2168
2169 for (; s; s = LIST_NEXT(s, entry)) {
2170 if (s->sync_state == PFSYNC_S_NONE &&
2171 s->timeout < PFTM_MAX &&
2172 s->pfsync_time <= sc->sc_ureq_received) {
2173 if (pfsync_update_state_req(s)) {
2174 /* We've filled a packet. */
2175 sc->sc_bulk_hashid = i;
2176 sc->sc_bulk_stateid = s->id;
2177 sc->sc_bulk_creatorid = s->creatorid;
2178 PF_HASHROW_UNLOCK(ih);
2179 callout_reset(&sc->sc_bulk_tmo, 1,
2180 pfsync_bulk_update, sc);
2181 goto full;
2182 }
2183 sent++;
2184 }
2185 }
2186 PF_HASHROW_UNLOCK(ih);
2187 }
2188
2189 /* We're done. */
2190 pfsync_bulk_status(PFSYNC_BUS_END);
2191 full:
2192 CURVNET_RESTORE();
2193 }
2194
2195 static void
pfsync_bulk_status(u_int8_t status)2196 pfsync_bulk_status(u_int8_t status)
2197 {
2198 struct {
2199 struct pfsync_subheader subh;
2200 struct pfsync_bus bus;
2201 } __packed r;
2202
2203 struct pfsync_softc *sc = V_pfsyncif;
2204
2205 bzero(&r, sizeof(r));
2206
2207 r.subh.action = PFSYNC_ACT_BUS;
2208 r.subh.count = htons(1);
2209 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_BUS]++;
2210
2211 r.bus.creatorid = V_pf_status.hostid;
2212 r.bus.endtime = htonl(time_uptime - sc->sc_ureq_received);
2213 r.bus.status = status;
2214
2215 pfsync_send_plus(&r, sizeof(r));
2216 }
2217
2218 static void
pfsync_bulk_fail(void * arg)2219 pfsync_bulk_fail(void *arg)
2220 {
2221 struct pfsync_softc *sc = arg;
2222 struct pfsync_bucket *b = &sc->sc_buckets[0];
2223
2224 CURVNET_SET(sc->sc_ifp->if_vnet);
2225
2226 PFSYNC_BLOCK_ASSERT(sc);
2227
2228 if (sc->sc_bulk_tries++ < PFSYNC_MAX_BULKTRIES) {
2229 /* Try again */
2230 callout_reset(&sc->sc_bulkfail_tmo, 5 * hz,
2231 pfsync_bulk_fail, V_pfsyncif);
2232 PFSYNC_BUCKET_LOCK(b);
2233 pfsync_request_update(0, 0);
2234 PFSYNC_BUCKET_UNLOCK(b);
2235 } else {
2236 /* Pretend like the transfer was ok. */
2237 sc->sc_ureq_sent = 0;
2238 sc->sc_bulk_tries = 0;
2239 PFSYNC_LOCK(sc);
2240 if (!(sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p)
2241 (*carp_demote_adj_p)(-V_pfsync_carp_adj,
2242 "pfsync bulk fail");
2243 sc->sc_flags |= PFSYNCF_OK;
2244 PFSYNC_UNLOCK(sc);
2245 if (V_pf_status.debug >= PF_DEBUG_MISC)
2246 printf("pfsync: failed to receive bulk update\n");
2247 }
2248
2249 CURVNET_RESTORE();
2250 }
2251
2252 static void
pfsync_send_plus(void * plus,size_t pluslen)2253 pfsync_send_plus(void *plus, size_t pluslen)
2254 {
2255 struct pfsync_softc *sc = V_pfsyncif;
2256 struct pfsync_bucket *b = &sc->sc_buckets[0];
2257
2258 PFSYNC_BUCKET_LOCK(b);
2259
2260 if (b->b_len + pluslen > sc->sc_ifp->if_mtu)
2261 pfsync_sendout(1, b->b_id);
2262
2263 b->b_plus = plus;
2264 b->b_len += (b->b_pluslen = pluslen);
2265
2266 pfsync_sendout(1, b->b_id);
2267 PFSYNC_BUCKET_UNLOCK(b);
2268 }
2269
2270 static void
pfsync_timeout(void * arg)2271 pfsync_timeout(void *arg)
2272 {
2273 struct pfsync_bucket *b = arg;
2274
2275 CURVNET_SET(b->b_sc->sc_ifp->if_vnet);
2276 PFSYNC_BUCKET_LOCK(b);
2277 pfsync_push(b);
2278 PFSYNC_BUCKET_UNLOCK(b);
2279 CURVNET_RESTORE();
2280 }
2281
2282 static void
pfsync_push(struct pfsync_bucket * b)2283 pfsync_push(struct pfsync_bucket *b)
2284 {
2285
2286 PFSYNC_BUCKET_LOCK_ASSERT(b);
2287
2288 b->b_flags |= PFSYNCF_BUCKET_PUSH;
2289 swi_sched(V_pfsync_swi_cookie, 0);
2290 }
2291
2292 static void
pfsync_push_all(struct pfsync_softc * sc)2293 pfsync_push_all(struct pfsync_softc *sc)
2294 {
2295 int c;
2296 struct pfsync_bucket *b;
2297
2298 for (c = 0; c < pfsync_buckets; c++) {
2299 b = &sc->sc_buckets[c];
2300
2301 PFSYNC_BUCKET_LOCK(b);
2302 pfsync_push(b);
2303 PFSYNC_BUCKET_UNLOCK(b);
2304 }
2305 }
2306
2307 static void
pfsyncintr(void * arg)2308 pfsyncintr(void *arg)
2309 {
2310 struct pfsync_softc *sc = arg;
2311 struct pfsync_bucket *b;
2312 struct mbuf *m, *n;
2313 int c;
2314
2315 CURVNET_SET(sc->sc_ifp->if_vnet);
2316
2317 for (c = 0; c < pfsync_buckets; c++) {
2318 b = &sc->sc_buckets[c];
2319
2320 PFSYNC_BUCKET_LOCK(b);
2321 if ((b->b_flags & PFSYNCF_BUCKET_PUSH) && b->b_len > PFSYNC_MINPKT) {
2322 pfsync_sendout(0, b->b_id);
2323 b->b_flags &= ~PFSYNCF_BUCKET_PUSH;
2324 }
2325 _IF_DEQUEUE_ALL(&b->b_snd, m);
2326 PFSYNC_BUCKET_UNLOCK(b);
2327
2328 for (; m != NULL; m = n) {
2329
2330 n = m->m_nextpkt;
2331 m->m_nextpkt = NULL;
2332
2333 /*
2334 * We distinguish between a deferral packet and our
2335 * own pfsync packet based on M_SKIP_FIREWALL
2336 * flag. This is XXX.
2337 */
2338 if (m->m_flags & M_SKIP_FIREWALL)
2339 ip_output(m, NULL, NULL, 0, NULL, NULL);
2340 else if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo,
2341 NULL) == 0)
2342 V_pfsyncstats.pfsyncs_opackets++;
2343 else
2344 V_pfsyncstats.pfsyncs_oerrors++;
2345 }
2346 }
2347 CURVNET_RESTORE();
2348 }
2349
2350 static int
pfsync_multicast_setup(struct pfsync_softc * sc,struct ifnet * ifp,struct in_mfilter * imf)2351 pfsync_multicast_setup(struct pfsync_softc *sc, struct ifnet *ifp,
2352 struct in_mfilter *imf)
2353 {
2354 struct ip_moptions *imo = &sc->sc_imo;
2355 int error;
2356
2357 if (!(ifp->if_flags & IFF_MULTICAST))
2358 return (EADDRNOTAVAIL);
2359
2360 imo->imo_multicast_vif = -1;
2361
2362 if ((error = in_joingroup(ifp, &sc->sc_sync_peer, NULL,
2363 &imf->imf_inm)) != 0)
2364 return (error);
2365
2366 ip_mfilter_init(&imo->imo_head);
2367 ip_mfilter_insert(&imo->imo_head, imf);
2368 imo->imo_multicast_ifp = ifp;
2369 imo->imo_multicast_ttl = PFSYNC_DFLTTL;
2370 imo->imo_multicast_loop = 0;
2371
2372 return (0);
2373 }
2374
2375 static void
pfsync_multicast_cleanup(struct pfsync_softc * sc)2376 pfsync_multicast_cleanup(struct pfsync_softc *sc)
2377 {
2378 struct ip_moptions *imo = &sc->sc_imo;
2379 struct in_mfilter *imf;
2380
2381 while ((imf = ip_mfilter_first(&imo->imo_head)) != NULL) {
2382 ip_mfilter_remove(&imo->imo_head, imf);
2383 in_leavegroup(imf->imf_inm, NULL);
2384 ip_mfilter_free(imf);
2385 }
2386 imo->imo_multicast_ifp = NULL;
2387 }
2388
2389 void
pfsync_detach_ifnet(struct ifnet * ifp)2390 pfsync_detach_ifnet(struct ifnet *ifp)
2391 {
2392 struct pfsync_softc *sc = V_pfsyncif;
2393
2394 if (sc == NULL)
2395 return;
2396
2397 PFSYNC_LOCK(sc);
2398
2399 if (sc->sc_sync_if == ifp) {
2400 /* We don't need mutlicast cleanup here, because the interface
2401 * is going away. We do need to ensure we don't try to do
2402 * cleanup later.
2403 */
2404 ip_mfilter_init(&sc->sc_imo.imo_head);
2405 sc->sc_imo.imo_multicast_ifp = NULL;
2406 sc->sc_sync_if = NULL;
2407 }
2408
2409 PFSYNC_UNLOCK(sc);
2410 }
2411
2412 #ifdef INET
2413 extern struct domain inetdomain;
2414 static struct protosw in_pfsync_protosw = {
2415 .pr_type = SOCK_RAW,
2416 .pr_domain = &inetdomain,
2417 .pr_protocol = IPPROTO_PFSYNC,
2418 .pr_flags = PR_ATOMIC|PR_ADDR,
2419 .pr_input = pfsync_input,
2420 .pr_output = rip_output,
2421 .pr_ctloutput = rip_ctloutput,
2422 .pr_usrreqs = &rip_usrreqs
2423 };
2424 #endif
2425
2426 static void
pfsync_pointers_init()2427 pfsync_pointers_init()
2428 {
2429
2430 PF_RULES_WLOCK();
2431 V_pfsync_state_import_ptr = pfsync_state_import;
2432 V_pfsync_insert_state_ptr = pfsync_insert_state;
2433 V_pfsync_update_state_ptr = pfsync_update_state;
2434 V_pfsync_delete_state_ptr = pfsync_delete_state;
2435 V_pfsync_clear_states_ptr = pfsync_clear_states;
2436 V_pfsync_defer_ptr = pfsync_defer;
2437 PF_RULES_WUNLOCK();
2438 }
2439
2440 static void
pfsync_pointers_uninit()2441 pfsync_pointers_uninit()
2442 {
2443
2444 PF_RULES_WLOCK();
2445 V_pfsync_state_import_ptr = NULL;
2446 V_pfsync_insert_state_ptr = NULL;
2447 V_pfsync_update_state_ptr = NULL;
2448 V_pfsync_delete_state_ptr = NULL;
2449 V_pfsync_clear_states_ptr = NULL;
2450 V_pfsync_defer_ptr = NULL;
2451 PF_RULES_WUNLOCK();
2452 }
2453
2454 static void
vnet_pfsync_init(const void * unused __unused)2455 vnet_pfsync_init(const void *unused __unused)
2456 {
2457 int error;
2458
2459 V_pfsync_cloner = if_clone_simple(pfsyncname,
2460 pfsync_clone_create, pfsync_clone_destroy, 1);
2461 error = swi_add(NULL, pfsyncname, pfsyncintr, V_pfsyncif,
2462 SWI_NET, INTR_MPSAFE, &V_pfsync_swi_cookie);
2463 if (error) {
2464 if_clone_detach(V_pfsync_cloner);
2465 log(LOG_INFO, "swi_add() failed in %s\n", __func__);
2466 }
2467
2468 pfsync_pointers_init();
2469 }
2470 VNET_SYSINIT(vnet_pfsync_init, SI_SUB_PROTO_FIREWALL, SI_ORDER_ANY,
2471 vnet_pfsync_init, NULL);
2472
2473 static void
vnet_pfsync_uninit(const void * unused __unused)2474 vnet_pfsync_uninit(const void *unused __unused)
2475 {
2476
2477 pfsync_pointers_uninit();
2478
2479 if_clone_detach(V_pfsync_cloner);
2480 swi_remove(V_pfsync_swi_cookie);
2481 }
2482
2483 VNET_SYSUNINIT(vnet_pfsync_uninit, SI_SUB_PROTO_FIREWALL, SI_ORDER_FOURTH,
2484 vnet_pfsync_uninit, NULL);
2485
2486 static int
pfsync_init()2487 pfsync_init()
2488 {
2489 #ifdef INET
2490 int error;
2491
2492 pfsync_detach_ifnet_ptr = pfsync_detach_ifnet;
2493
2494 error = pf_proto_register(PF_INET, &in_pfsync_protosw);
2495 if (error)
2496 return (error);
2497 error = ipproto_register(IPPROTO_PFSYNC);
2498 if (error) {
2499 pf_proto_unregister(PF_INET, IPPROTO_PFSYNC, SOCK_RAW);
2500 return (error);
2501 }
2502 #endif
2503
2504 return (0);
2505 }
2506
2507 static void
pfsync_uninit()2508 pfsync_uninit()
2509 {
2510 pfsync_detach_ifnet_ptr = NULL;
2511
2512 #ifdef INET
2513 ipproto_unregister(IPPROTO_PFSYNC);
2514 pf_proto_unregister(PF_INET, IPPROTO_PFSYNC, SOCK_RAW);
2515 #endif
2516 }
2517
2518 static int
pfsync_modevent(module_t mod,int type,void * data)2519 pfsync_modevent(module_t mod, int type, void *data)
2520 {
2521 int error = 0;
2522
2523 switch (type) {
2524 case MOD_LOAD:
2525 error = pfsync_init();
2526 break;
2527 case MOD_UNLOAD:
2528 pfsync_uninit();
2529 break;
2530 default:
2531 error = EINVAL;
2532 break;
2533 }
2534
2535 return (error);
2536 }
2537
2538 static moduledata_t pfsync_mod = {
2539 pfsyncname,
2540 pfsync_modevent,
2541 0
2542 };
2543
2544 #define PFSYNC_MODVER 1
2545
2546 /* Stay on FIREWALL as we depend on pf being initialized and on inetdomain. */
2547 DECLARE_MODULE(pfsync, pfsync_mod, SI_SUB_PROTO_FIREWALL, SI_ORDER_ANY);
2548 MODULE_VERSION(pfsync, PFSYNC_MODVER);
2549 MODULE_DEPEND(pfsync, pf, PF_MODVER, PF_MODVER, PF_MODVER);
2550