1 /*-
2 * SPDX-License-Identifier: (BSD-2-Clause AND ISC)
3 *
4 * Copyright (c) 2002 Michael Shalayeff
5 * Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org>
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 <dlg@openbsd.org>
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 #include "opt_inet.h"
64 #include "opt_inet6.h"
65 #include "opt_pf.h"
66
67 #include <sys/param.h>
68 #include <sys/bus.h>
69 #include <sys/endian.h>
70 #include <sys/interrupt.h>
71 #include <sys/kernel.h>
72 #include <sys/lock.h>
73 #include <sys/mbuf.h>
74 #include <sys/module.h>
75 #include <sys/mutex.h>
76 #include <sys/nv.h>
77 #include <sys/priv.h>
78 #include <sys/smp.h>
79 #include <sys/socket.h>
80 #include <sys/sockio.h>
81 #include <sys/sysctl.h>
82 #include <sys/syslog.h>
83
84 #include <net/bpf.h>
85 #include <net/if.h>
86 #include <net/if_var.h>
87 #include <net/if_clone.h>
88 #include <net/if_private.h>
89 #include <net/if_types.h>
90 #include <net/vnet.h>
91 #include <net/pfvar.h>
92 #include <net/route.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 <netinet6/in6_var.h>
99 #include <netinet/ip.h>
100 #include <netinet/ip6.h>
101 #include <netinet/ip_carp.h>
102 #include <netinet/ip_var.h>
103 #include <netinet/tcp.h>
104 #include <netinet/tcp_fsm.h>
105 #include <netinet/tcp_seq.h>
106
107 #include <netinet/ip6.h>
108 #include <netinet6/ip6_var.h>
109 #include <netinet6/scope6_var.h>
110
111 #include <netpfil/pf/pfsync_nv.h>
112
113 struct pfsync_bucket;
114 struct pfsync_softc;
115
116 union inet_template {
117 struct ip ipv4;
118 struct ip6_hdr ipv6;
119 };
120
121 #define PFSYNC_MINPKT ( \
122 sizeof(union inet_template) + \
123 sizeof(struct pfsync_header) + \
124 sizeof(struct pfsync_subheader) )
125
126 static int pfsync_upd_tcp(struct pf_kstate *, struct pfsync_state_peer *,
127 struct pfsync_state_peer *);
128 static int pfsync_in_clr(struct mbuf *, int, int, int, int);
129 static int pfsync_in_ins(struct mbuf *, int, int, int, int);
130 static int pfsync_in_iack(struct mbuf *, int, int, int, int);
131 static int pfsync_in_upd(struct mbuf *, int, int, int, int);
132 static int pfsync_in_upd_c(struct mbuf *, int, int, int, int);
133 static int pfsync_in_ureq(struct mbuf *, int, int, int, int);
134 static int pfsync_in_del_c(struct mbuf *, int, int, int, int);
135 static int pfsync_in_bus(struct mbuf *, int, int, int, int);
136 static int pfsync_in_tdb(struct mbuf *, int, int, int, int);
137 static int pfsync_in_eof(struct mbuf *, int, int, int, int);
138 static int pfsync_in_error(struct mbuf *, int, int, int, int);
139
140 static int (*pfsync_acts[])(struct mbuf *, int, int, int, int) = {
141 pfsync_in_clr, /* PFSYNC_ACT_CLR */
142 pfsync_in_ins, /* PFSYNC_ACT_INS_1301 */
143 pfsync_in_iack, /* PFSYNC_ACT_INS_ACK */
144 pfsync_in_upd, /* PFSYNC_ACT_UPD_1301 */
145 pfsync_in_upd_c, /* PFSYNC_ACT_UPD_C */
146 pfsync_in_ureq, /* PFSYNC_ACT_UPD_REQ */
147 pfsync_in_error, /* PFSYNC_ACT_DEL */
148 pfsync_in_del_c, /* PFSYNC_ACT_DEL_C */
149 pfsync_in_error, /* PFSYNC_ACT_INS_F */
150 pfsync_in_error, /* PFSYNC_ACT_DEL_F */
151 pfsync_in_bus, /* PFSYNC_ACT_BUS */
152 pfsync_in_tdb, /* PFSYNC_ACT_TDB */
153 pfsync_in_eof, /* PFSYNC_ACT_EOF */
154 pfsync_in_ins, /* PFSYNC_ACT_INS_1400 */
155 pfsync_in_upd, /* PFSYNC_ACT_UPD_1400 */
156 };
157
158 struct pfsync_q {
159 void (*write)(struct pf_kstate *, void *);
160 size_t len;
161 u_int8_t action;
162 };
163
164 /* We have the following sync queues */
165 enum pfsync_q_id {
166 PFSYNC_Q_INS_1301,
167 PFSYNC_Q_INS_1400,
168 PFSYNC_Q_IACK,
169 PFSYNC_Q_UPD_1301,
170 PFSYNC_Q_UPD_1400,
171 PFSYNC_Q_UPD_C,
172 PFSYNC_Q_DEL_C,
173 PFSYNC_Q_COUNT,
174 };
175
176 /* Functions for building messages for given queue */
177 static void pfsync_out_state_1301(struct pf_kstate *, void *);
178 static void pfsync_out_state_1400(struct pf_kstate *, void *);
179 static void pfsync_out_iack(struct pf_kstate *, void *);
180 static void pfsync_out_upd_c(struct pf_kstate *, void *);
181 static void pfsync_out_del_c(struct pf_kstate *, void *);
182
183 /* Attach those functions to queue */
184 static struct pfsync_q pfsync_qs[] = {
185 { pfsync_out_state_1301, sizeof(struct pfsync_state_1301), PFSYNC_ACT_INS_1301 },
186 { pfsync_out_state_1400, sizeof(struct pfsync_state_1400), PFSYNC_ACT_INS_1400 },
187 { pfsync_out_iack, sizeof(struct pfsync_ins_ack), PFSYNC_ACT_INS_ACK },
188 { pfsync_out_state_1301, sizeof(struct pfsync_state_1301), PFSYNC_ACT_UPD_1301 },
189 { pfsync_out_state_1400, sizeof(struct pfsync_state_1400), PFSYNC_ACT_UPD_1400 },
190 { pfsync_out_upd_c, sizeof(struct pfsync_upd_c), PFSYNC_ACT_UPD_C },
191 { pfsync_out_del_c, sizeof(struct pfsync_del_c), PFSYNC_ACT_DEL_C }
192 };
193
194 /* Map queue to pf_kstate->sync_state */
195 static u_int8_t pfsync_qid_sstate[] = {
196 PFSYNC_S_INS, /* PFSYNC_Q_INS_1301 */
197 PFSYNC_S_INS, /* PFSYNC_Q_INS_1400 */
198 PFSYNC_S_IACK, /* PFSYNC_Q_IACK */
199 PFSYNC_S_UPD, /* PFSYNC_Q_UPD_1301 */
200 PFSYNC_S_UPD, /* PFSYNC_Q_UPD_1400 */
201 PFSYNC_S_UPD_C, /* PFSYNC_Q_UPD_C */
202 PFSYNC_S_DEL_C, /* PFSYNC_Q_DEL_C */
203 };
204
205 /* Map pf_kstate->sync_state to queue */
206 static enum pfsync_q_id pfsync_sstate_to_qid(u_int8_t);
207
208 static void pfsync_q_ins(struct pf_kstate *, int sync_state, bool);
209 static void pfsync_q_del(struct pf_kstate *, bool, struct pfsync_bucket *);
210
211 static void pfsync_update_state(struct pf_kstate *);
212 static void pfsync_tx(struct pfsync_softc *, struct mbuf *);
213
214 struct pfsync_upd_req_item {
215 TAILQ_ENTRY(pfsync_upd_req_item) ur_entry;
216 struct pfsync_upd_req ur_msg;
217 };
218
219 struct pfsync_deferral {
220 struct pfsync_softc *pd_sc;
221 TAILQ_ENTRY(pfsync_deferral) pd_entry;
222 struct callout pd_tmo;
223
224 struct pf_kstate *pd_st;
225 struct mbuf *pd_m;
226 };
227
228 struct pfsync_bucket
229 {
230 int b_id;
231 struct pfsync_softc *b_sc;
232 struct mtx b_mtx;
233 struct callout b_tmo;
234 int b_flags;
235 #define PFSYNCF_BUCKET_PUSH 0x00000001
236
237 size_t b_len;
238 TAILQ_HEAD(, pf_kstate) b_qs[PFSYNC_Q_COUNT];
239 TAILQ_HEAD(, pfsync_upd_req_item) b_upd_req_list;
240 TAILQ_HEAD(, pfsync_deferral) b_deferrals;
241 u_int b_deferred;
242 uint8_t *b_plus;
243 size_t b_pluslen;
244
245 struct ifaltq b_snd;
246 };
247
248 struct pfsync_softc {
249 /* Configuration */
250 struct ifnet *sc_ifp;
251 struct ifnet *sc_sync_if;
252 struct ip_moptions sc_imo;
253 struct ip6_moptions sc_im6o;
254 struct sockaddr_storage sc_sync_peer;
255 uint32_t sc_flags;
256 uint8_t sc_maxupdates;
257 union inet_template sc_template;
258 struct mtx sc_mtx;
259 uint32_t sc_version;
260
261 /* Queued data */
262 struct pfsync_bucket *sc_buckets;
263
264 /* Bulk update info */
265 struct mtx sc_bulk_mtx;
266 uint32_t sc_ureq_sent;
267 int sc_bulk_tries;
268 uint32_t sc_ureq_received;
269 int sc_bulk_hashid;
270 uint64_t sc_bulk_stateid;
271 uint32_t sc_bulk_creatorid;
272 struct callout sc_bulk_tmo;
273 struct callout sc_bulkfail_tmo;
274 };
275
276 #define PFSYNC_LOCK(sc) mtx_lock(&(sc)->sc_mtx)
277 #define PFSYNC_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx)
278 #define PFSYNC_LOCK_ASSERT(sc) mtx_assert(&(sc)->sc_mtx, MA_OWNED)
279
280 #define PFSYNC_BUCKET_LOCK(b) mtx_lock(&(b)->b_mtx)
281 #define PFSYNC_BUCKET_UNLOCK(b) mtx_unlock(&(b)->b_mtx)
282 #define PFSYNC_BUCKET_LOCK_ASSERT(b) mtx_assert(&(b)->b_mtx, MA_OWNED)
283
284 #define PFSYNC_BLOCK(sc) mtx_lock(&(sc)->sc_bulk_mtx)
285 #define PFSYNC_BUNLOCK(sc) mtx_unlock(&(sc)->sc_bulk_mtx)
286 #define PFSYNC_BLOCK_ASSERT(sc) mtx_assert(&(sc)->sc_bulk_mtx, MA_OWNED)
287
288 #define PFSYNC_DEFER_TIMEOUT 20
289
290 static const char pfsyncname[] = "pfsync";
291 static MALLOC_DEFINE(M_PFSYNC, pfsyncname, "pfsync(4) data");
292 VNET_DEFINE_STATIC(struct pfsync_softc *, pfsyncif) = NULL;
293 #define V_pfsyncif VNET(pfsyncif)
294 VNET_DEFINE_STATIC(void *, pfsync_swi_cookie) = NULL;
295 #define V_pfsync_swi_cookie VNET(pfsync_swi_cookie)
296 VNET_DEFINE_STATIC(struct intr_event *, pfsync_swi_ie);
297 #define V_pfsync_swi_ie VNET(pfsync_swi_ie)
298 VNET_DEFINE_STATIC(struct pfsyncstats, pfsyncstats);
299 #define V_pfsyncstats VNET(pfsyncstats)
300 VNET_DEFINE_STATIC(int, pfsync_carp_adj) = CARP_MAXSKEW;
301 #define V_pfsync_carp_adj VNET(pfsync_carp_adj)
302 VNET_DEFINE_STATIC(unsigned int, pfsync_defer_timeout) = PFSYNC_DEFER_TIMEOUT;
303 #define V_pfsync_defer_timeout VNET(pfsync_defer_timeout)
304
305 static void pfsync_timeout(void *);
306 static void pfsync_push(struct pfsync_bucket *);
307 static void pfsync_push_all(struct pfsync_softc *);
308 static void pfsyncintr(void *);
309 static int pfsync_multicast_setup(struct pfsync_softc *, struct ifnet *,
310 struct in_mfilter *, struct in6_mfilter *);
311 static void pfsync_multicast_cleanup(struct pfsync_softc *);
312 static void pfsync_pointers_init(void);
313 static void pfsync_pointers_uninit(void);
314 static int pfsync_init(void);
315 static void pfsync_uninit(void);
316
317 static unsigned long pfsync_buckets;
318
319 SYSCTL_NODE(_net, OID_AUTO, pfsync, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
320 "PFSYNC");
321 SYSCTL_STRUCT(_net_pfsync, OID_AUTO, stats, CTLFLAG_VNET | CTLFLAG_RW,
322 &VNET_NAME(pfsyncstats), pfsyncstats,
323 "PFSYNC statistics (struct pfsyncstats, net/if_pfsync.h)");
324 SYSCTL_INT(_net_pfsync, OID_AUTO, carp_demotion_factor, CTLFLAG_VNET | CTLFLAG_RW,
325 &VNET_NAME(pfsync_carp_adj), 0, "pfsync's CARP demotion factor adjustment");
326 SYSCTL_ULONG(_net_pfsync, OID_AUTO, pfsync_buckets, CTLFLAG_RDTUN,
327 &pfsync_buckets, 0, "Number of pfsync hash buckets");
328 SYSCTL_UINT(_net_pfsync, OID_AUTO, defer_delay, CTLFLAG_VNET | CTLFLAG_RW,
329 &VNET_NAME(pfsync_defer_timeout), 0, "Deferred packet timeout (in ms)");
330
331 static int pfsync_clone_create(struct if_clone *, int, caddr_t);
332 static void pfsync_clone_destroy(struct ifnet *);
333 static int pfsync_alloc_scrub_memory(struct pfsync_state_peer *,
334 struct pf_state_peer *);
335 static int pfsyncoutput(struct ifnet *, struct mbuf *,
336 const struct sockaddr *, struct route *);
337 static int pfsyncioctl(struct ifnet *, u_long, caddr_t);
338
339 static int pfsync_defer(struct pf_kstate *, struct mbuf *);
340 static void pfsync_undefer(struct pfsync_deferral *, int);
341 static void pfsync_undefer_state_locked(struct pf_kstate *, int);
342 static void pfsync_undefer_state(struct pf_kstate *, int);
343 static void pfsync_defer_tmo(void *);
344
345 static void pfsync_request_update(u_int32_t, u_int64_t);
346 static bool pfsync_update_state_req(struct pf_kstate *);
347
348 static void pfsync_drop_all(struct pfsync_softc *);
349 static void pfsync_drop(struct pfsync_softc *, int);
350 static void pfsync_sendout(int, int);
351 static void pfsync_send_plus(void *, size_t);
352
353 static void pfsync_bulk_start(void);
354 static void pfsync_bulk_status(u_int8_t);
355 static void pfsync_bulk_update(void *);
356 static void pfsync_bulk_fail(void *);
357
358 static void pfsync_detach_ifnet(struct ifnet *);
359
360 static int pfsync_pfsyncreq_to_kstatus(struct pfsyncreq *,
361 struct pfsync_kstatus *);
362 static int pfsync_kstatus_to_softc(struct pfsync_kstatus *,
363 struct pfsync_softc *);
364
365 #ifdef IPSEC
366 static void pfsync_update_net_tdb(struct pfsync_tdb *);
367 #endif
368 static struct pfsync_bucket *pfsync_get_bucket(struct pfsync_softc *,
369 struct pf_kstate *);
370
371 #define PFSYNC_MAX_BULKTRIES 12
372
373 VNET_DEFINE(struct if_clone *, pfsync_cloner);
374 #define V_pfsync_cloner VNET(pfsync_cloner)
375
376 const struct in6_addr in6addr_linklocal_pfsync_group =
377 {{{ 0xff, 0x12, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
378 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0 }}};
379 static int
pfsync_clone_create(struct if_clone * ifc,int unit,caddr_t param)380 pfsync_clone_create(struct if_clone *ifc, int unit, caddr_t param)
381 {
382 struct pfsync_softc *sc;
383 struct ifnet *ifp;
384 struct pfsync_bucket *b;
385 int c;
386 enum pfsync_q_id q;
387
388 if (unit != 0)
389 return (EINVAL);
390
391 if (! pfsync_buckets)
392 pfsync_buckets = mp_ncpus * 2;
393
394 sc = malloc(sizeof(struct pfsync_softc), M_PFSYNC, M_WAITOK | M_ZERO);
395 sc->sc_flags |= PFSYNCF_OK;
396 sc->sc_maxupdates = 128;
397 sc->sc_version = PFSYNC_MSG_VERSION_DEFAULT;
398
399 ifp = sc->sc_ifp = if_alloc(IFT_PFSYNC);
400 if_initname(ifp, pfsyncname, unit);
401 ifp->if_softc = sc;
402 ifp->if_ioctl = pfsyncioctl;
403 ifp->if_output = pfsyncoutput;
404 ifp->if_type = IFT_PFSYNC;
405 ifp->if_hdrlen = sizeof(struct pfsync_header);
406 ifp->if_mtu = ETHERMTU;
407 mtx_init(&sc->sc_mtx, pfsyncname, NULL, MTX_DEF);
408 mtx_init(&sc->sc_bulk_mtx, "pfsync bulk", NULL, MTX_DEF);
409 callout_init_mtx(&sc->sc_bulk_tmo, &sc->sc_bulk_mtx, 0);
410 callout_init_mtx(&sc->sc_bulkfail_tmo, &sc->sc_bulk_mtx, 0);
411
412 if_attach(ifp);
413
414 bpfattach(ifp, DLT_PFSYNC, PFSYNC_HDRLEN);
415
416 sc->sc_buckets = mallocarray(pfsync_buckets, sizeof(*sc->sc_buckets),
417 M_PFSYNC, M_ZERO | M_WAITOK);
418 for (c = 0; c < pfsync_buckets; c++) {
419 b = &sc->sc_buckets[c];
420 mtx_init(&b->b_mtx, "pfsync bucket", NULL, MTX_DEF);
421
422 b->b_id = c;
423 b->b_sc = sc;
424 b->b_len = PFSYNC_MINPKT;
425
426 for (q = 0; q < PFSYNC_Q_COUNT; q++)
427 TAILQ_INIT(&b->b_qs[q]);
428
429 TAILQ_INIT(&b->b_upd_req_list);
430 TAILQ_INIT(&b->b_deferrals);
431
432 callout_init(&b->b_tmo, 1);
433
434 b->b_snd.ifq_maxlen = ifqmaxlen;
435 }
436
437 V_pfsyncif = sc;
438
439 return (0);
440 }
441
442 static void
pfsync_clone_destroy(struct ifnet * ifp)443 pfsync_clone_destroy(struct ifnet *ifp)
444 {
445 struct pfsync_softc *sc = ifp->if_softc;
446 struct pfsync_bucket *b;
447 int c, ret;
448
449 for (c = 0; c < pfsync_buckets; c++) {
450 b = &sc->sc_buckets[c];
451 /*
452 * At this stage, everything should have already been
453 * cleared by pfsync_uninit(), and we have only to
454 * drain callouts.
455 */
456 PFSYNC_BUCKET_LOCK(b);
457 while (b->b_deferred > 0) {
458 struct pfsync_deferral *pd =
459 TAILQ_FIRST(&b->b_deferrals);
460
461 ret = callout_stop(&pd->pd_tmo);
462 PFSYNC_BUCKET_UNLOCK(b);
463 if (ret > 0) {
464 pfsync_undefer(pd, 1);
465 } else {
466 callout_drain(&pd->pd_tmo);
467 }
468 PFSYNC_BUCKET_LOCK(b);
469 }
470 MPASS(b->b_deferred == 0);
471 MPASS(TAILQ_EMPTY(&b->b_deferrals));
472 PFSYNC_BUCKET_UNLOCK(b);
473
474 free(b->b_plus, M_PFSYNC);
475 b->b_plus = NULL;
476 b->b_pluslen = 0;
477
478 callout_drain(&b->b_tmo);
479 }
480
481 callout_drain(&sc->sc_bulkfail_tmo);
482 callout_drain(&sc->sc_bulk_tmo);
483
484 if (!(sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p)
485 (*carp_demote_adj_p)(-V_pfsync_carp_adj, "pfsync destroy");
486 bpfdetach(ifp);
487 if_detach(ifp);
488
489 pfsync_drop_all(sc);
490
491 if_free(ifp);
492 pfsync_multicast_cleanup(sc);
493 mtx_destroy(&sc->sc_mtx);
494 mtx_destroy(&sc->sc_bulk_mtx);
495
496 free(sc->sc_buckets, M_PFSYNC);
497 free(sc, M_PFSYNC);
498
499 V_pfsyncif = NULL;
500 }
501
502 static int
pfsync_alloc_scrub_memory(struct pfsync_state_peer * s,struct pf_state_peer * d)503 pfsync_alloc_scrub_memory(struct pfsync_state_peer *s,
504 struct pf_state_peer *d)
505 {
506 if (s->scrub.scrub_flag && d->scrub == NULL) {
507 d->scrub = uma_zalloc(V_pf_state_scrub_z, M_NOWAIT | M_ZERO);
508 if (d->scrub == NULL)
509 return (ENOMEM);
510 }
511
512 return (0);
513 }
514
515 static int
pfsync_state_import(union pfsync_state_union * sp,int flags,int msg_version)516 pfsync_state_import(union pfsync_state_union *sp, int flags, int msg_version)
517 {
518 struct pfsync_softc *sc = V_pfsyncif;
519 #ifndef __NO_STRICT_ALIGNMENT
520 struct pfsync_state_key key[2];
521 #endif
522 struct pfsync_state_key *kw, *ks;
523 struct pf_kstate *st = NULL;
524 struct pf_state_key *skw = NULL, *sks = NULL;
525 struct pf_krule *r = NULL;
526 struct pfi_kkif *kif;
527 int error;
528
529 PF_RULES_RASSERT();
530
531 if (sp->pfs_1301.creatorid == 0) {
532 if (V_pf_status.debug >= PF_DEBUG_MISC)
533 printf("%s: invalid creator id: %08x\n", __func__,
534 ntohl(sp->pfs_1301.creatorid));
535 return (EINVAL);
536 }
537
538 if ((kif = pfi_kkif_find(sp->pfs_1301.ifname)) == NULL) {
539 if (V_pf_status.debug >= PF_DEBUG_MISC)
540 printf("%s: unknown interface: %s\n", __func__,
541 sp->pfs_1301.ifname);
542 if (flags & PFSYNC_SI_IOCTL)
543 return (EINVAL);
544 return (0); /* skip this state */
545 }
546
547 /*
548 * If the ruleset checksums match or the state is coming from the ioctl,
549 * it's safe to associate the state with the rule of that number.
550 */
551 if (sp->pfs_1301.rule != htonl(-1) && sp->pfs_1301.anchor == htonl(-1) &&
552 (flags & (PFSYNC_SI_IOCTL | PFSYNC_SI_CKSUM)) && ntohl(sp->pfs_1301.rule) <
553 pf_main_ruleset.rules[PF_RULESET_FILTER].active.rcount)
554 r = pf_main_ruleset.rules[
555 PF_RULESET_FILTER].active.ptr_array[ntohl(sp->pfs_1301.rule)];
556 else
557 r = &V_pf_default_rule;
558
559 if ((r->max_states &&
560 counter_u64_fetch(r->states_cur) >= r->max_states))
561 goto cleanup;
562
563 /*
564 * XXXGL: consider M_WAITOK in ioctl path after.
565 */
566 st = pf_alloc_state(M_NOWAIT);
567 if (__predict_false(st == NULL))
568 goto cleanup;
569
570 if ((skw = uma_zalloc(V_pf_state_key_z, M_NOWAIT)) == NULL)
571 goto cleanup;
572
573 #ifndef __NO_STRICT_ALIGNMENT
574 bcopy(&sp->pfs_1301.key, key, sizeof(struct pfsync_state_key) * 2);
575 kw = &key[PF_SK_WIRE];
576 ks = &key[PF_SK_STACK];
577 #else
578 kw = &sp->pfs_1301.key[PF_SK_WIRE];
579 ks = &sp->pfs_1301.key[PF_SK_STACK];
580 #endif
581
582 if (PF_ANEQ(&kw->addr[0], &ks->addr[0], sp->pfs_1301.af) ||
583 PF_ANEQ(&kw->addr[1], &ks->addr[1], sp->pfs_1301.af) ||
584 kw->port[0] != ks->port[0] ||
585 kw->port[1] != ks->port[1]) {
586 sks = uma_zalloc(V_pf_state_key_z, M_NOWAIT);
587 if (sks == NULL)
588 goto cleanup;
589 } else
590 sks = skw;
591
592 /* allocate memory for scrub info */
593 if (pfsync_alloc_scrub_memory(&sp->pfs_1301.src, &st->src) ||
594 pfsync_alloc_scrub_memory(&sp->pfs_1301.dst, &st->dst))
595 goto cleanup;
596
597 /* Copy to state key(s). */
598 skw->addr[0] = kw->addr[0];
599 skw->addr[1] = kw->addr[1];
600 skw->port[0] = kw->port[0];
601 skw->port[1] = kw->port[1];
602 skw->proto = sp->pfs_1301.proto;
603 skw->af = sp->pfs_1301.af;
604 if (sks != skw) {
605 sks->addr[0] = ks->addr[0];
606 sks->addr[1] = ks->addr[1];
607 sks->port[0] = ks->port[0];
608 sks->port[1] = ks->port[1];
609 sks->proto = sp->pfs_1301.proto;
610 sks->af = sp->pfs_1301.af;
611 }
612
613 /* copy to state */
614 bcopy(&sp->pfs_1301.rt_addr, &st->rt_addr, sizeof(st->rt_addr));
615 st->creation = (time_uptime - ntohl(sp->pfs_1301.creation)) * 1000;
616 st->expire = pf_get_uptime();
617 if (sp->pfs_1301.expire) {
618 uint32_t timeout;
619
620 timeout = r->timeout[sp->pfs_1301.timeout];
621 if (!timeout)
622 timeout = V_pf_default_rule.timeout[sp->pfs_1301.timeout];
623
624 /* sp->expire may have been adaptively scaled by export. */
625 st->expire -= (timeout - ntohl(sp->pfs_1301.expire)) * 1000;
626 }
627
628 st->direction = sp->pfs_1301.direction;
629 st->act.log = sp->pfs_1301.log;
630 st->timeout = sp->pfs_1301.timeout;
631
632 switch (msg_version) {
633 case PFSYNC_MSG_VERSION_1301:
634 st->state_flags = sp->pfs_1301.state_flags;
635 /*
636 * In FreeBSD 13 pfsync lacks many attributes. Copy them
637 * from the rule if possible. If rule can't be matched
638 * clear any set options as we can't recover their
639 * parameters.
640 */
641 if (r == &V_pf_default_rule) {
642 st->state_flags &= ~PFSTATE_SETMASK;
643 } else {
644 /*
645 * Similar to pf_rule_to_actions(). This code
646 * won't set the actions properly if they come
647 * from multiple "match" rules as only rule
648 * creating the state is send over pfsync.
649 */
650 st->act.qid = r->qid;
651 st->act.pqid = r->pqid;
652 st->act.rtableid = r->rtableid;
653 if (r->scrub_flags & PFSTATE_SETTOS)
654 st->act.set_tos = r->set_tos;
655 st->act.min_ttl = r->min_ttl;
656 st->act.max_mss = r->max_mss;
657 st->state_flags |= (r->scrub_flags &
658 (PFSTATE_NODF|PFSTATE_RANDOMID|
659 PFSTATE_SETTOS|PFSTATE_SCRUB_TCP|
660 PFSTATE_SETPRIO));
661 if (r->dnpipe || r->dnrpipe) {
662 if (r->free_flags & PFRULE_DN_IS_PIPE)
663 st->state_flags |= PFSTATE_DN_IS_PIPE;
664 else
665 st->state_flags &= ~PFSTATE_DN_IS_PIPE;
666 }
667 st->act.dnpipe = r->dnpipe;
668 st->act.dnrpipe = r->dnrpipe;
669 }
670 break;
671 case PFSYNC_MSG_VERSION_1400:
672 st->state_flags = ntohs(sp->pfs_1400.state_flags);
673 st->act.qid = ntohs(sp->pfs_1400.qid);
674 st->act.pqid = ntohs(sp->pfs_1400.pqid);
675 st->act.dnpipe = ntohs(sp->pfs_1400.dnpipe);
676 st->act.dnrpipe = ntohs(sp->pfs_1400.dnrpipe);
677 st->act.rtableid = ntohl(sp->pfs_1400.rtableid);
678 st->act.min_ttl = sp->pfs_1400.min_ttl;
679 st->act.set_tos = sp->pfs_1400.set_tos;
680 st->act.max_mss = ntohs(sp->pfs_1400.max_mss);
681 st->act.set_prio[0] = sp->pfs_1400.set_prio[0];
682 st->act.set_prio[1] = sp->pfs_1400.set_prio[1];
683 st->rt = sp->pfs_1400.rt;
684 if (st->rt && (st->rt_kif = pfi_kkif_find(sp->pfs_1400.rt_ifname)) == NULL) {
685 if (V_pf_status.debug >= PF_DEBUG_MISC)
686 printf("%s: unknown route interface: %s\n",
687 __func__, sp->pfs_1400.rt_ifname);
688 if (flags & PFSYNC_SI_IOCTL)
689 error = EINVAL;
690 else
691 error = 0;
692 goto cleanup_keys;
693 }
694 break;
695 default:
696 panic("%s: Unsupported pfsync_msg_version %d",
697 __func__, msg_version);
698 }
699
700 st->id = sp->pfs_1301.id;
701 st->creatorid = sp->pfs_1301.creatorid;
702 pf_state_peer_ntoh(&sp->pfs_1301.src, &st->src);
703 pf_state_peer_ntoh(&sp->pfs_1301.dst, &st->dst);
704
705 st->rule = r;
706 st->nat_rule = NULL;
707 st->anchor = NULL;
708
709 st->pfsync_time = time_uptime;
710 st->sync_state = PFSYNC_S_NONE;
711
712 if (!(flags & PFSYNC_SI_IOCTL))
713 st->state_flags |= PFSTATE_NOSYNC;
714
715 if ((error = pf_state_insert(kif, kif, skw, sks, st)) != 0)
716 goto cleanup_state;
717
718 /* XXX when we have nat_rule/anchors, use STATE_INC_COUNTERS */
719 counter_u64_add(r->states_cur, 1);
720 counter_u64_add(r->states_tot, 1);
721
722 if (!(flags & PFSYNC_SI_IOCTL)) {
723 st->state_flags &= ~PFSTATE_NOSYNC;
724 if (st->state_flags & PFSTATE_ACK) {
725 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
726 PFSYNC_BUCKET_LOCK(b);
727 pfsync_q_ins(st, PFSYNC_S_IACK, true);
728 PFSYNC_BUCKET_UNLOCK(b);
729
730 pfsync_push_all(sc);
731 }
732 }
733 st->state_flags &= ~PFSTATE_ACK;
734 PF_STATE_UNLOCK(st);
735
736 return (0);
737
738 cleanup:
739 error = ENOMEM;
740 cleanup_keys:
741 if (skw == sks)
742 sks = NULL;
743 uma_zfree(V_pf_state_key_z, skw);
744 uma_zfree(V_pf_state_key_z, sks);
745
746 cleanup_state: /* pf_state_insert() frees the state keys. */
747 if (st) {
748 st->timeout = PFTM_UNLINKED; /* appease an assert */
749 pf_free_state(st);
750 }
751 return (error);
752 }
753
754 #ifdef INET
755 static int
pfsync_input(struct mbuf ** mp,int * offp __unused,int proto __unused)756 pfsync_input(struct mbuf **mp, int *offp __unused, int proto __unused)
757 {
758 struct pfsync_softc *sc = V_pfsyncif;
759 struct mbuf *m = *mp;
760 struct ip *ip = mtod(m, struct ip *);
761 struct pfsync_header *ph;
762 struct pfsync_subheader subh;
763
764 int offset, len, flags = 0;
765 int rv;
766 uint16_t count;
767
768 PF_RULES_RLOCK_TRACKER;
769
770 *mp = NULL;
771 V_pfsyncstats.pfsyncs_ipackets++;
772
773 /* Verify that we have a sync interface configured. */
774 if (!sc || !sc->sc_sync_if || !V_pf_status.running ||
775 (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
776 goto done;
777
778 /* verify that the packet came in on the right interface */
779 if (sc->sc_sync_if != m->m_pkthdr.rcvif) {
780 V_pfsyncstats.pfsyncs_badif++;
781 goto done;
782 }
783
784 if_inc_counter(sc->sc_ifp, IFCOUNTER_IPACKETS, 1);
785 if_inc_counter(sc->sc_ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
786 /* verify that the IP TTL is 255. */
787 if (ip->ip_ttl != PFSYNC_DFLTTL) {
788 V_pfsyncstats.pfsyncs_badttl++;
789 goto done;
790 }
791
792 offset = ip->ip_hl << 2;
793 if (m->m_pkthdr.len < offset + sizeof(*ph)) {
794 V_pfsyncstats.pfsyncs_hdrops++;
795 goto done;
796 }
797
798 if (offset + sizeof(*ph) > m->m_len) {
799 if (m_pullup(m, offset + sizeof(*ph)) == NULL) {
800 V_pfsyncstats.pfsyncs_hdrops++;
801 return (IPPROTO_DONE);
802 }
803 ip = mtod(m, struct ip *);
804 }
805 ph = (struct pfsync_header *)((char *)ip + offset);
806
807 /* verify the version */
808 if (ph->version != PFSYNC_VERSION) {
809 V_pfsyncstats.pfsyncs_badver++;
810 goto done;
811 }
812
813 len = ntohs(ph->len) + offset;
814 if (m->m_pkthdr.len < len) {
815 V_pfsyncstats.pfsyncs_badlen++;
816 goto done;
817 }
818
819 /*
820 * Trusting pf_chksum during packet processing, as well as seeking
821 * in interface name tree, require holding PF_RULES_RLOCK().
822 */
823 PF_RULES_RLOCK();
824 if (!bcmp(&ph->pfcksum, &V_pf_status.pf_chksum, PF_MD5_DIGEST_LENGTH))
825 flags = PFSYNC_SI_CKSUM;
826
827 offset += sizeof(*ph);
828 while (offset <= len - sizeof(subh)) {
829 m_copydata(m, offset, sizeof(subh), (caddr_t)&subh);
830 offset += sizeof(subh);
831
832 if (subh.action >= PFSYNC_ACT_MAX) {
833 V_pfsyncstats.pfsyncs_badact++;
834 PF_RULES_RUNLOCK();
835 goto done;
836 }
837
838 count = ntohs(subh.count);
839 V_pfsyncstats.pfsyncs_iacts[subh.action] += count;
840 rv = (*pfsync_acts[subh.action])(m, offset, count, flags, subh.action);
841 if (rv == -1) {
842 PF_RULES_RUNLOCK();
843 return (IPPROTO_DONE);
844 }
845
846 offset += rv;
847 }
848 PF_RULES_RUNLOCK();
849
850 done:
851 m_freem(m);
852 return (IPPROTO_DONE);
853 }
854 #endif
855
856 #ifdef INET6
857 static int
pfsync6_input(struct mbuf ** mp,int * offp __unused,int proto __unused)858 pfsync6_input(struct mbuf **mp, int *offp __unused, int proto __unused)
859 {
860 struct pfsync_softc *sc = V_pfsyncif;
861 struct mbuf *m = *mp;
862 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
863 struct pfsync_header *ph;
864 struct pfsync_subheader subh;
865
866 int offset, len, flags = 0;
867 int rv;
868 uint16_t count;
869
870 PF_RULES_RLOCK_TRACKER;
871
872 *mp = NULL;
873 V_pfsyncstats.pfsyncs_ipackets++;
874
875 /* Verify that we have a sync interface configured. */
876 if (!sc || !sc->sc_sync_if || !V_pf_status.running ||
877 (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
878 goto done;
879
880 /* verify that the packet came in on the right interface */
881 if (sc->sc_sync_if != m->m_pkthdr.rcvif) {
882 V_pfsyncstats.pfsyncs_badif++;
883 goto done;
884 }
885
886 if_inc_counter(sc->sc_ifp, IFCOUNTER_IPACKETS, 1);
887 if_inc_counter(sc->sc_ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
888 /* verify that the IP TTL is 255. */
889 if (ip6->ip6_hlim != PFSYNC_DFLTTL) {
890 V_pfsyncstats.pfsyncs_badttl++;
891 goto done;
892 }
893
894
895 offset = sizeof(*ip6);
896 if (m->m_pkthdr.len < offset + sizeof(*ph)) {
897 V_pfsyncstats.pfsyncs_hdrops++;
898 goto done;
899 }
900
901 if (offset + sizeof(*ph) > m->m_len) {
902 if (m_pullup(m, offset + sizeof(*ph)) == NULL) {
903 V_pfsyncstats.pfsyncs_hdrops++;
904 return (IPPROTO_DONE);
905 }
906 ip6 = mtod(m, struct ip6_hdr *);
907 }
908 ph = (struct pfsync_header *)((char *)ip6 + offset);
909
910 /* verify the version */
911 if (ph->version != PFSYNC_VERSION) {
912 V_pfsyncstats.pfsyncs_badver++;
913 goto done;
914 }
915
916 len = ntohs(ph->len) + offset;
917 if (m->m_pkthdr.len < len) {
918 V_pfsyncstats.pfsyncs_badlen++;
919 goto done;
920 }
921
922 /*
923 * Trusting pf_chksum during packet processing, as well as seeking
924 * in interface name tree, require holding PF_RULES_RLOCK().
925 */
926 PF_RULES_RLOCK();
927 if (!bcmp(&ph->pfcksum, &V_pf_status.pf_chksum, PF_MD5_DIGEST_LENGTH))
928 flags = PFSYNC_SI_CKSUM;
929
930 offset += sizeof(*ph);
931 while (offset <= len - sizeof(subh)) {
932 m_copydata(m, offset, sizeof(subh), (caddr_t)&subh);
933 offset += sizeof(subh);
934
935 if (subh.action >= PFSYNC_ACT_MAX) {
936 V_pfsyncstats.pfsyncs_badact++;
937 PF_RULES_RUNLOCK();
938 goto done;
939 }
940
941 count = ntohs(subh.count);
942 V_pfsyncstats.pfsyncs_iacts[subh.action] += count;
943 rv = (*pfsync_acts[subh.action])(m, offset, count, flags, subh.action);
944 if (rv == -1) {
945 PF_RULES_RUNLOCK();
946 return (IPPROTO_DONE);
947 }
948
949 offset += rv;
950 }
951 PF_RULES_RUNLOCK();
952
953 done:
954 m_freem(m);
955 return (IPPROTO_DONE);
956 }
957 #endif
958
959 static int
pfsync_in_clr(struct mbuf * m,int offset,int count,int flags,int action)960 pfsync_in_clr(struct mbuf *m, int offset, int count, int flags, int action)
961 {
962 struct pfsync_clr *clr;
963 struct mbuf *mp;
964 int len = sizeof(*clr) * count;
965 int i, offp;
966 u_int32_t creatorid;
967
968 mp = m_pulldown(m, offset, len, &offp);
969 if (mp == NULL) {
970 V_pfsyncstats.pfsyncs_badlen++;
971 return (-1);
972 }
973 clr = (struct pfsync_clr *)(mp->m_data + offp);
974
975 for (i = 0; i < count; i++) {
976 creatorid = clr[i].creatorid;
977
978 if (clr[i].ifname[0] != '\0' &&
979 pfi_kkif_find(clr[i].ifname) == NULL)
980 continue;
981
982 for (int i = 0; i <= V_pf_hashmask; i++) {
983 struct pf_idhash *ih = &V_pf_idhash[i];
984 struct pf_kstate *s;
985 relock:
986 PF_HASHROW_LOCK(ih);
987 LIST_FOREACH(s, &ih->states, entry) {
988 if (s->creatorid == creatorid) {
989 s->state_flags |= PFSTATE_NOSYNC;
990 pf_unlink_state(s);
991 goto relock;
992 }
993 }
994 PF_HASHROW_UNLOCK(ih);
995 }
996 }
997
998 return (len);
999 }
1000
1001 static int
pfsync_in_ins(struct mbuf * m,int offset,int count,int flags,int action)1002 pfsync_in_ins(struct mbuf *m, int offset, int count, int flags, int action)
1003 {
1004 struct mbuf *mp;
1005 union pfsync_state_union *sa, *sp;
1006 int i, offp, total_len, msg_version, msg_len;
1007
1008 switch (action) {
1009 case PFSYNC_ACT_INS_1301:
1010 msg_len = sizeof(struct pfsync_state_1301);
1011 total_len = msg_len * count;
1012 msg_version = PFSYNC_MSG_VERSION_1301;
1013 break;
1014 case PFSYNC_ACT_INS_1400:
1015 msg_len = sizeof(struct pfsync_state_1400);
1016 total_len = msg_len * count;
1017 msg_version = PFSYNC_MSG_VERSION_1400;
1018 break;
1019 default:
1020 V_pfsyncstats.pfsyncs_badact++;
1021 return (-1);
1022 }
1023
1024 mp = m_pulldown(m, offset, total_len, &offp);
1025 if (mp == NULL) {
1026 V_pfsyncstats.pfsyncs_badlen++;
1027 return (-1);
1028 }
1029 sa = (union pfsync_state_union *)(mp->m_data + offp);
1030
1031 for (i = 0; i < count; i++) {
1032 sp = (union pfsync_state_union *)((char *)sa + msg_len * i);
1033
1034 /* Check for invalid values. */
1035 if (sp->pfs_1301.timeout >= PFTM_MAX ||
1036 sp->pfs_1301.src.state > PF_TCPS_PROXY_DST ||
1037 sp->pfs_1301.dst.state > PF_TCPS_PROXY_DST ||
1038 sp->pfs_1301.direction > PF_OUT ||
1039 (sp->pfs_1301.af != AF_INET &&
1040 sp->pfs_1301.af != AF_INET6)) {
1041 if (V_pf_status.debug >= PF_DEBUG_MISC)
1042 printf("%s: invalid value\n", __func__);
1043 V_pfsyncstats.pfsyncs_badval++;
1044 continue;
1045 }
1046
1047 if (pfsync_state_import(sp, flags, msg_version) == ENOMEM)
1048 /* Drop out, but process the rest of the actions. */
1049 break;
1050 }
1051
1052 return (total_len);
1053 }
1054
1055 static int
pfsync_in_iack(struct mbuf * m,int offset,int count,int flags,int action)1056 pfsync_in_iack(struct mbuf *m, int offset, int count, int flags, int action)
1057 {
1058 struct pfsync_ins_ack *ia, *iaa;
1059 struct pf_kstate *st;
1060
1061 struct mbuf *mp;
1062 int len = count * sizeof(*ia);
1063 int offp, i;
1064
1065 mp = m_pulldown(m, offset, len, &offp);
1066 if (mp == NULL) {
1067 V_pfsyncstats.pfsyncs_badlen++;
1068 return (-1);
1069 }
1070 iaa = (struct pfsync_ins_ack *)(mp->m_data + offp);
1071
1072 for (i = 0; i < count; i++) {
1073 ia = &iaa[i];
1074
1075 st = pf_find_state_byid(ia->id, ia->creatorid);
1076 if (st == NULL)
1077 continue;
1078
1079 if (st->state_flags & PFSTATE_ACK) {
1080 pfsync_undefer_state(st, 0);
1081 }
1082 PF_STATE_UNLOCK(st);
1083 }
1084 /*
1085 * XXX this is not yet implemented, but we know the size of the
1086 * message so we can skip it.
1087 */
1088
1089 return (count * sizeof(struct pfsync_ins_ack));
1090 }
1091
1092 static int
pfsync_upd_tcp(struct pf_kstate * st,struct pfsync_state_peer * src,struct pfsync_state_peer * dst)1093 pfsync_upd_tcp(struct pf_kstate *st, struct pfsync_state_peer *src,
1094 struct pfsync_state_peer *dst)
1095 {
1096 int sync = 0;
1097
1098 PF_STATE_LOCK_ASSERT(st);
1099
1100 /*
1101 * The state should never go backwards except
1102 * for syn-proxy states. Neither should the
1103 * sequence window slide backwards.
1104 */
1105 if ((st->src.state > src->state &&
1106 (st->src.state < PF_TCPS_PROXY_SRC ||
1107 src->state >= PF_TCPS_PROXY_SRC)) ||
1108
1109 (st->src.state == src->state &&
1110 SEQ_GT(st->src.seqlo, ntohl(src->seqlo))))
1111 sync++;
1112 else
1113 pf_state_peer_ntoh(src, &st->src);
1114
1115 if ((st->dst.state > dst->state) ||
1116
1117 (st->dst.state >= TCPS_SYN_SENT &&
1118 SEQ_GT(st->dst.seqlo, ntohl(dst->seqlo))))
1119 sync++;
1120 else
1121 pf_state_peer_ntoh(dst, &st->dst);
1122
1123 return (sync);
1124 }
1125
1126 static int
pfsync_in_upd(struct mbuf * m,int offset,int count,int flags,int action)1127 pfsync_in_upd(struct mbuf *m, int offset, int count, int flags, int action)
1128 {
1129 struct pfsync_softc *sc = V_pfsyncif;
1130 union pfsync_state_union *sa, *sp;
1131 struct pf_kstate *st;
1132 struct mbuf *mp;
1133 int sync, offp, i, total_len, msg_len, msg_version;
1134
1135 switch (action) {
1136 case PFSYNC_ACT_UPD_1301:
1137 msg_len = sizeof(struct pfsync_state_1301);
1138 total_len = msg_len * count;
1139 msg_version = PFSYNC_MSG_VERSION_1301;
1140 break;
1141 case PFSYNC_ACT_UPD_1400:
1142 msg_len = sizeof(struct pfsync_state_1400);
1143 total_len = msg_len * count;
1144 msg_version = PFSYNC_MSG_VERSION_1400;
1145 break;
1146 default:
1147 V_pfsyncstats.pfsyncs_badact++;
1148 return (-1);
1149 }
1150
1151 mp = m_pulldown(m, offset, total_len, &offp);
1152 if (mp == NULL) {
1153 V_pfsyncstats.pfsyncs_badlen++;
1154 return (-1);
1155 }
1156 sa = (union pfsync_state_union *)(mp->m_data + offp);
1157
1158 for (i = 0; i < count; i++) {
1159 sp = (union pfsync_state_union *)((char *)sa + msg_len * i);
1160
1161 /* check for invalid values */
1162 if (sp->pfs_1301.timeout >= PFTM_MAX ||
1163 sp->pfs_1301.src.state > PF_TCPS_PROXY_DST ||
1164 sp->pfs_1301.dst.state > PF_TCPS_PROXY_DST) {
1165 if (V_pf_status.debug >= PF_DEBUG_MISC) {
1166 printf("pfsync_input: PFSYNC_ACT_UPD: "
1167 "invalid value\n");
1168 }
1169 V_pfsyncstats.pfsyncs_badval++;
1170 continue;
1171 }
1172
1173 st = pf_find_state_byid(sp->pfs_1301.id, sp->pfs_1301.creatorid);
1174 if (st == NULL) {
1175 /* insert the update */
1176 if (pfsync_state_import(sp, flags, msg_version))
1177 V_pfsyncstats.pfsyncs_badstate++;
1178 continue;
1179 }
1180
1181 if (st->state_flags & PFSTATE_ACK) {
1182 pfsync_undefer_state(st, 1);
1183 }
1184
1185 if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP)
1186 sync = pfsync_upd_tcp(st, &sp->pfs_1301.src, &sp->pfs_1301.dst);
1187 else {
1188 sync = 0;
1189
1190 /*
1191 * Non-TCP protocol state machine always go
1192 * forwards
1193 */
1194 if (st->src.state > sp->pfs_1301.src.state)
1195 sync++;
1196 else
1197 pf_state_peer_ntoh(&sp->pfs_1301.src, &st->src);
1198 if (st->dst.state > sp->pfs_1301.dst.state)
1199 sync++;
1200 else
1201 pf_state_peer_ntoh(&sp->pfs_1301.dst, &st->dst);
1202 }
1203 if (sync < 2) {
1204 pfsync_alloc_scrub_memory(&sp->pfs_1301.dst, &st->dst);
1205 pf_state_peer_ntoh(&sp->pfs_1301.dst, &st->dst);
1206 st->expire = pf_get_uptime();
1207 st->timeout = sp->pfs_1301.timeout;
1208 }
1209 st->pfsync_time = time_uptime;
1210
1211 if (sync) {
1212 V_pfsyncstats.pfsyncs_stale++;
1213
1214 pfsync_update_state(st);
1215 PF_STATE_UNLOCK(st);
1216 pfsync_push_all(sc);
1217 continue;
1218 }
1219 PF_STATE_UNLOCK(st);
1220 }
1221
1222 return (total_len);
1223 }
1224
1225 static int
pfsync_in_upd_c(struct mbuf * m,int offset,int count,int flags,int action)1226 pfsync_in_upd_c(struct mbuf *m, int offset, int count, int flags, int action)
1227 {
1228 struct pfsync_softc *sc = V_pfsyncif;
1229 struct pfsync_upd_c *ua, *up;
1230 struct pf_kstate *st;
1231 int len = count * sizeof(*up);
1232 int sync;
1233 struct mbuf *mp;
1234 int offp, i;
1235
1236 mp = m_pulldown(m, offset, len, &offp);
1237 if (mp == NULL) {
1238 V_pfsyncstats.pfsyncs_badlen++;
1239 return (-1);
1240 }
1241 ua = (struct pfsync_upd_c *)(mp->m_data + offp);
1242
1243 for (i = 0; i < count; i++) {
1244 up = &ua[i];
1245
1246 /* check for invalid values */
1247 if (up->timeout >= PFTM_MAX ||
1248 up->src.state > PF_TCPS_PROXY_DST ||
1249 up->dst.state > PF_TCPS_PROXY_DST) {
1250 if (V_pf_status.debug >= PF_DEBUG_MISC) {
1251 printf("pfsync_input: "
1252 "PFSYNC_ACT_UPD_C: "
1253 "invalid value\n");
1254 }
1255 V_pfsyncstats.pfsyncs_badval++;
1256 continue;
1257 }
1258
1259 st = pf_find_state_byid(up->id, up->creatorid);
1260 if (st == NULL) {
1261 /* We don't have this state. Ask for it. */
1262 PFSYNC_BUCKET_LOCK(&sc->sc_buckets[0]);
1263 pfsync_request_update(up->creatorid, up->id);
1264 PFSYNC_BUCKET_UNLOCK(&sc->sc_buckets[0]);
1265 continue;
1266 }
1267
1268 if (st->state_flags & PFSTATE_ACK) {
1269 pfsync_undefer_state(st, 1);
1270 }
1271
1272 if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP)
1273 sync = pfsync_upd_tcp(st, &up->src, &up->dst);
1274 else {
1275 sync = 0;
1276
1277 /*
1278 * Non-TCP protocol state machine always go
1279 * forwards
1280 */
1281 if (st->src.state > up->src.state)
1282 sync++;
1283 else
1284 pf_state_peer_ntoh(&up->src, &st->src);
1285 if (st->dst.state > up->dst.state)
1286 sync++;
1287 else
1288 pf_state_peer_ntoh(&up->dst, &st->dst);
1289 }
1290 if (sync < 2) {
1291 pfsync_alloc_scrub_memory(&up->dst, &st->dst);
1292 pf_state_peer_ntoh(&up->dst, &st->dst);
1293 st->expire = pf_get_uptime();
1294 st->timeout = up->timeout;
1295 }
1296 st->pfsync_time = time_uptime;
1297
1298 if (sync) {
1299 V_pfsyncstats.pfsyncs_stale++;
1300
1301 pfsync_update_state(st);
1302 PF_STATE_UNLOCK(st);
1303 pfsync_push_all(sc);
1304 continue;
1305 }
1306 PF_STATE_UNLOCK(st);
1307 }
1308
1309 return (len);
1310 }
1311
1312 static int
pfsync_in_ureq(struct mbuf * m,int offset,int count,int flags,int action)1313 pfsync_in_ureq(struct mbuf *m, int offset, int count, int flags, int action)
1314 {
1315 struct pfsync_upd_req *ur, *ura;
1316 struct mbuf *mp;
1317 int len = count * sizeof(*ur);
1318 int i, offp;
1319
1320 struct pf_kstate *st;
1321
1322 mp = m_pulldown(m, offset, len, &offp);
1323 if (mp == NULL) {
1324 V_pfsyncstats.pfsyncs_badlen++;
1325 return (-1);
1326 }
1327 ura = (struct pfsync_upd_req *)(mp->m_data + offp);
1328
1329 for (i = 0; i < count; i++) {
1330 ur = &ura[i];
1331
1332 if (ur->id == 0 && ur->creatorid == 0)
1333 pfsync_bulk_start();
1334 else {
1335 st = pf_find_state_byid(ur->id, ur->creatorid);
1336 if (st == NULL) {
1337 V_pfsyncstats.pfsyncs_badstate++;
1338 continue;
1339 }
1340 if (st->state_flags & PFSTATE_NOSYNC) {
1341 PF_STATE_UNLOCK(st);
1342 continue;
1343 }
1344
1345 pfsync_update_state_req(st);
1346 PF_STATE_UNLOCK(st);
1347 }
1348 }
1349
1350 return (len);
1351 }
1352
1353 static int
pfsync_in_del_c(struct mbuf * m,int offset,int count,int flags,int action)1354 pfsync_in_del_c(struct mbuf *m, int offset, int count, int flags, int action)
1355 {
1356 struct mbuf *mp;
1357 struct pfsync_del_c *sa, *sp;
1358 struct pf_kstate *st;
1359 int len = count * sizeof(*sp);
1360 int offp, i;
1361
1362 mp = m_pulldown(m, offset, len, &offp);
1363 if (mp == NULL) {
1364 V_pfsyncstats.pfsyncs_badlen++;
1365 return (-1);
1366 }
1367 sa = (struct pfsync_del_c *)(mp->m_data + offp);
1368
1369 for (i = 0; i < count; i++) {
1370 sp = &sa[i];
1371
1372 st = pf_find_state_byid(sp->id, sp->creatorid);
1373 if (st == NULL) {
1374 V_pfsyncstats.pfsyncs_badstate++;
1375 continue;
1376 }
1377
1378 st->state_flags |= PFSTATE_NOSYNC;
1379 pf_unlink_state(st);
1380 }
1381
1382 return (len);
1383 }
1384
1385 static int
pfsync_in_bus(struct mbuf * m,int offset,int count,int flags,int action)1386 pfsync_in_bus(struct mbuf *m, int offset, int count, int flags, int action)
1387 {
1388 struct pfsync_softc *sc = V_pfsyncif;
1389 struct pfsync_bus *bus;
1390 struct mbuf *mp;
1391 int len = count * sizeof(*bus);
1392 int offp;
1393
1394 PFSYNC_BLOCK(sc);
1395
1396 /* If we're not waiting for a bulk update, who cares. */
1397 if (sc->sc_ureq_sent == 0) {
1398 PFSYNC_BUNLOCK(sc);
1399 return (len);
1400 }
1401
1402 mp = m_pulldown(m, offset, len, &offp);
1403 if (mp == NULL) {
1404 PFSYNC_BUNLOCK(sc);
1405 V_pfsyncstats.pfsyncs_badlen++;
1406 return (-1);
1407 }
1408 bus = (struct pfsync_bus *)(mp->m_data + offp);
1409
1410 switch (bus->status) {
1411 case PFSYNC_BUS_START:
1412 callout_reset(&sc->sc_bulkfail_tmo, 4 * hz +
1413 V_pf_limits[PF_LIMIT_STATES].limit /
1414 ((sc->sc_ifp->if_mtu - PFSYNC_MINPKT) /
1415 sizeof(union pfsync_state_union)),
1416 pfsync_bulk_fail, sc);
1417 if (V_pf_status.debug >= PF_DEBUG_MISC)
1418 printf("pfsync: received bulk update start\n");
1419 break;
1420
1421 case PFSYNC_BUS_END:
1422 if (time_uptime - ntohl(bus->endtime) >=
1423 sc->sc_ureq_sent) {
1424 /* that's it, we're happy */
1425 sc->sc_ureq_sent = 0;
1426 sc->sc_bulk_tries = 0;
1427 callout_stop(&sc->sc_bulkfail_tmo);
1428 if (!(sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p)
1429 (*carp_demote_adj_p)(-V_pfsync_carp_adj,
1430 "pfsync bulk done");
1431 sc->sc_flags |= PFSYNCF_OK;
1432 if (V_pf_status.debug >= PF_DEBUG_MISC)
1433 printf("pfsync: received valid "
1434 "bulk update end\n");
1435 } else {
1436 if (V_pf_status.debug >= PF_DEBUG_MISC)
1437 printf("pfsync: received invalid "
1438 "bulk update end: bad timestamp\n");
1439 }
1440 break;
1441 }
1442 PFSYNC_BUNLOCK(sc);
1443
1444 return (len);
1445 }
1446
1447 static int
pfsync_in_tdb(struct mbuf * m,int offset,int count,int flags,int action)1448 pfsync_in_tdb(struct mbuf *m, int offset, int count, int flags, int action)
1449 {
1450 int len = count * sizeof(struct pfsync_tdb);
1451
1452 #if defined(IPSEC)
1453 struct pfsync_tdb *tp;
1454 struct mbuf *mp;
1455 int offp;
1456 int i;
1457 int s;
1458
1459 mp = m_pulldown(m, offset, len, &offp);
1460 if (mp == NULL) {
1461 V_pfsyncstats.pfsyncs_badlen++;
1462 return (-1);
1463 }
1464 tp = (struct pfsync_tdb *)(mp->m_data + offp);
1465
1466 for (i = 0; i < count; i++)
1467 pfsync_update_net_tdb(&tp[i]);
1468 #endif
1469
1470 return (len);
1471 }
1472
1473 #if defined(IPSEC)
1474 /* Update an in-kernel tdb. Silently fail if no tdb is found. */
1475 static void
pfsync_update_net_tdb(struct pfsync_tdb * pt)1476 pfsync_update_net_tdb(struct pfsync_tdb *pt)
1477 {
1478 struct tdb *tdb;
1479 int s;
1480
1481 /* check for invalid values */
1482 if (ntohl(pt->spi) <= SPI_RESERVED_MAX ||
1483 (pt->dst.sa.sa_family != AF_INET &&
1484 pt->dst.sa.sa_family != AF_INET6))
1485 goto bad;
1486
1487 tdb = gettdb(pt->spi, &pt->dst, pt->sproto);
1488 if (tdb) {
1489 pt->rpl = ntohl(pt->rpl);
1490 pt->cur_bytes = (unsigned long long)be64toh(pt->cur_bytes);
1491
1492 /* Neither replay nor byte counter should ever decrease. */
1493 if (pt->rpl < tdb->tdb_rpl ||
1494 pt->cur_bytes < tdb->tdb_cur_bytes) {
1495 goto bad;
1496 }
1497
1498 tdb->tdb_rpl = pt->rpl;
1499 tdb->tdb_cur_bytes = pt->cur_bytes;
1500 }
1501 return;
1502
1503 bad:
1504 if (V_pf_status.debug >= PF_DEBUG_MISC)
1505 printf("pfsync_insert: PFSYNC_ACT_TDB_UPD: "
1506 "invalid value\n");
1507 V_pfsyncstats.pfsyncs_badstate++;
1508 return;
1509 }
1510 #endif
1511
1512 static int
pfsync_in_eof(struct mbuf * m,int offset,int count,int flags,int action)1513 pfsync_in_eof(struct mbuf *m, int offset, int count, int flags, int action)
1514 {
1515 /* check if we are at the right place in the packet */
1516 if (offset != m->m_pkthdr.len)
1517 V_pfsyncstats.pfsyncs_badlen++;
1518
1519 /* we're done. free and let the caller return */
1520 m_freem(m);
1521 return (-1);
1522 }
1523
1524 static int
pfsync_in_error(struct mbuf * m,int offset,int count,int flags,int action)1525 pfsync_in_error(struct mbuf *m, int offset, int count, int flags, int action)
1526 {
1527 V_pfsyncstats.pfsyncs_badact++;
1528
1529 m_freem(m);
1530 return (-1);
1531 }
1532
1533 static int
pfsyncoutput(struct ifnet * ifp,struct mbuf * m,const struct sockaddr * dst,struct route * rt)1534 pfsyncoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
1535 struct route *rt)
1536 {
1537 m_freem(m);
1538 return (0);
1539 }
1540
1541 /* ARGSUSED */
1542 static int
pfsyncioctl(struct ifnet * ifp,u_long cmd,caddr_t data)1543 pfsyncioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
1544 {
1545 struct pfsync_softc *sc = ifp->if_softc;
1546 struct ifreq *ifr = (struct ifreq *)data;
1547 struct pfsyncreq pfsyncr;
1548 size_t nvbuflen;
1549 int error;
1550 int c;
1551
1552 switch (cmd) {
1553 case SIOCSIFFLAGS:
1554 PFSYNC_LOCK(sc);
1555 if (ifp->if_flags & IFF_UP) {
1556 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1557 PFSYNC_UNLOCK(sc);
1558 pfsync_pointers_init();
1559 } else {
1560 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1561 PFSYNC_UNLOCK(sc);
1562 pfsync_pointers_uninit();
1563 }
1564 break;
1565 case SIOCSIFMTU:
1566 if (!sc->sc_sync_if ||
1567 ifr->ifr_mtu <= PFSYNC_MINPKT ||
1568 ifr->ifr_mtu > sc->sc_sync_if->if_mtu)
1569 return (EINVAL);
1570 if (ifr->ifr_mtu < ifp->if_mtu) {
1571 for (c = 0; c < pfsync_buckets; c++) {
1572 PFSYNC_BUCKET_LOCK(&sc->sc_buckets[c]);
1573 if (sc->sc_buckets[c].b_len > PFSYNC_MINPKT)
1574 pfsync_sendout(1, c);
1575 PFSYNC_BUCKET_UNLOCK(&sc->sc_buckets[c]);
1576 }
1577 }
1578 ifp->if_mtu = ifr->ifr_mtu;
1579 break;
1580 case SIOCGETPFSYNC:
1581 bzero(&pfsyncr, sizeof(pfsyncr));
1582 PFSYNC_LOCK(sc);
1583 if (sc->sc_sync_if) {
1584 strlcpy(pfsyncr.pfsyncr_syncdev,
1585 sc->sc_sync_if->if_xname, IFNAMSIZ);
1586 }
1587 pfsyncr.pfsyncr_syncpeer = ((struct sockaddr_in *)&sc->sc_sync_peer)->sin_addr;
1588 pfsyncr.pfsyncr_maxupdates = sc->sc_maxupdates;
1589 pfsyncr.pfsyncr_defer = sc->sc_flags;
1590 PFSYNC_UNLOCK(sc);
1591 return (copyout(&pfsyncr, ifr_data_get_ptr(ifr),
1592 sizeof(pfsyncr)));
1593
1594 case SIOCGETPFSYNCNV:
1595 {
1596 nvlist_t *nvl_syncpeer;
1597 nvlist_t *nvl = nvlist_create(0);
1598
1599 if (nvl == NULL)
1600 return (ENOMEM);
1601
1602 if (sc->sc_sync_if)
1603 nvlist_add_string(nvl, "syncdev", sc->sc_sync_if->if_xname);
1604 nvlist_add_number(nvl, "maxupdates", sc->sc_maxupdates);
1605 nvlist_add_number(nvl, "flags", sc->sc_flags);
1606 nvlist_add_number(nvl, "version", sc->sc_version);
1607 if ((nvl_syncpeer = pfsync_sockaddr_to_syncpeer_nvlist(&sc->sc_sync_peer)) != NULL)
1608 nvlist_add_nvlist(nvl, "syncpeer", nvl_syncpeer);
1609
1610 void *packed = NULL;
1611 packed = nvlist_pack(nvl, &nvbuflen);
1612 if (packed == NULL) {
1613 free(packed, M_NVLIST);
1614 nvlist_destroy(nvl);
1615 return (ENOMEM);
1616 }
1617
1618 if (nvbuflen > ifr->ifr_cap_nv.buf_length) {
1619 ifr->ifr_cap_nv.length = nvbuflen;
1620 ifr->ifr_cap_nv.buffer = NULL;
1621 free(packed, M_NVLIST);
1622 nvlist_destroy(nvl);
1623 return (EFBIG);
1624 }
1625
1626 ifr->ifr_cap_nv.length = nvbuflen;
1627 error = copyout(packed, ifr->ifr_cap_nv.buffer, nvbuflen);
1628
1629 nvlist_destroy(nvl);
1630 nvlist_destroy(nvl_syncpeer);
1631 free(packed, M_NVLIST);
1632 break;
1633 }
1634
1635 case SIOCSETPFSYNC:
1636 {
1637 struct pfsync_kstatus status;
1638
1639 if ((error = priv_check(curthread, PRIV_NETINET_PF)) != 0)
1640 return (error);
1641 if ((error = copyin(ifr_data_get_ptr(ifr), &pfsyncr,
1642 sizeof(pfsyncr))))
1643 return (error);
1644
1645 memset((char *)&status, 0, sizeof(struct pfsync_kstatus));
1646 pfsync_pfsyncreq_to_kstatus(&pfsyncr, &status);
1647
1648 error = pfsync_kstatus_to_softc(&status, sc);
1649 return (error);
1650 }
1651 case SIOCSETPFSYNCNV:
1652 {
1653 struct pfsync_kstatus status;
1654 void *data;
1655 nvlist_t *nvl;
1656
1657 if ((error = priv_check(curthread, PRIV_NETINET_PF)) != 0)
1658 return (error);
1659 if (ifr->ifr_cap_nv.length > IFR_CAP_NV_MAXBUFSIZE)
1660 return (EINVAL);
1661
1662 data = malloc(ifr->ifr_cap_nv.length, M_TEMP, M_WAITOK);
1663
1664 if ((error = copyin(ifr->ifr_cap_nv.buffer, data,
1665 ifr->ifr_cap_nv.length)) != 0) {
1666 free(data, M_TEMP);
1667 return (error);
1668 }
1669
1670 if ((nvl = nvlist_unpack(data, ifr->ifr_cap_nv.length, 0)) == NULL) {
1671 free(data, M_TEMP);
1672 return (EINVAL);
1673 }
1674
1675 memset((char *)&status, 0, sizeof(struct pfsync_kstatus));
1676 pfsync_nvstatus_to_kstatus(nvl, &status);
1677
1678 nvlist_destroy(nvl);
1679 free(data, M_TEMP);
1680
1681 error = pfsync_kstatus_to_softc(&status, sc);
1682 return (error);
1683 }
1684 default:
1685 return (ENOTTY);
1686 }
1687
1688 return (0);
1689 }
1690
1691 static void
pfsync_out_state_1301(struct pf_kstate * st,void * buf)1692 pfsync_out_state_1301(struct pf_kstate *st, void *buf)
1693 {
1694 union pfsync_state_union *sp = buf;
1695
1696 pfsync_state_export(sp, st, PFSYNC_MSG_VERSION_1301);
1697 }
1698
1699 static void
pfsync_out_state_1400(struct pf_kstate * st,void * buf)1700 pfsync_out_state_1400(struct pf_kstate *st, void *buf)
1701 {
1702 union pfsync_state_union *sp = buf;
1703
1704 pfsync_state_export(sp, st, PFSYNC_MSG_VERSION_1400);
1705 }
1706
1707 static void
pfsync_out_iack(struct pf_kstate * st,void * buf)1708 pfsync_out_iack(struct pf_kstate *st, void *buf)
1709 {
1710 struct pfsync_ins_ack *iack = buf;
1711
1712 iack->id = st->id;
1713 iack->creatorid = st->creatorid;
1714 }
1715
1716 static void
pfsync_out_upd_c(struct pf_kstate * st,void * buf)1717 pfsync_out_upd_c(struct pf_kstate *st, void *buf)
1718 {
1719 struct pfsync_upd_c *up = buf;
1720
1721 bzero(up, sizeof(*up));
1722 up->id = st->id;
1723 pf_state_peer_hton(&st->src, &up->src);
1724 pf_state_peer_hton(&st->dst, &up->dst);
1725 up->creatorid = st->creatorid;
1726 up->timeout = st->timeout;
1727 }
1728
1729 static void
pfsync_out_del_c(struct pf_kstate * st,void * buf)1730 pfsync_out_del_c(struct pf_kstate *st, void *buf)
1731 {
1732 struct pfsync_del_c *dp = buf;
1733
1734 dp->id = st->id;
1735 dp->creatorid = st->creatorid;
1736 st->state_flags |= PFSTATE_NOSYNC;
1737 }
1738
1739 static void
pfsync_drop_all(struct pfsync_softc * sc)1740 pfsync_drop_all(struct pfsync_softc *sc)
1741 {
1742 struct pfsync_bucket *b;
1743 int c;
1744
1745 for (c = 0; c < pfsync_buckets; c++) {
1746 b = &sc->sc_buckets[c];
1747
1748 PFSYNC_BUCKET_LOCK(b);
1749 pfsync_drop(sc, c);
1750 PFSYNC_BUCKET_UNLOCK(b);
1751 }
1752 }
1753
1754 static void
pfsync_drop(struct pfsync_softc * sc,int c)1755 pfsync_drop(struct pfsync_softc *sc, int c)
1756 {
1757 struct pf_kstate *st, *next;
1758 struct pfsync_upd_req_item *ur;
1759 struct pfsync_bucket *b;
1760 enum pfsync_q_id q;
1761
1762 b = &sc->sc_buckets[c];
1763 PFSYNC_BUCKET_LOCK_ASSERT(b);
1764
1765 for (q = 0; q < PFSYNC_Q_COUNT; q++) {
1766 if (TAILQ_EMPTY(&b->b_qs[q]))
1767 continue;
1768
1769 TAILQ_FOREACH_SAFE(st, &b->b_qs[q], sync_list, next) {
1770 KASSERT(st->sync_state == pfsync_qid_sstate[q],
1771 ("%s: st->sync_state %d == q %d",
1772 __func__, st->sync_state, q));
1773 st->sync_state = PFSYNC_S_NONE;
1774 pf_release_state(st);
1775 }
1776 TAILQ_INIT(&b->b_qs[q]);
1777 }
1778
1779 while ((ur = TAILQ_FIRST(&b->b_upd_req_list)) != NULL) {
1780 TAILQ_REMOVE(&b->b_upd_req_list, ur, ur_entry);
1781 free(ur, M_PFSYNC);
1782 }
1783
1784 b->b_len = PFSYNC_MINPKT;
1785 free(b->b_plus, M_PFSYNC);
1786 b->b_plus = NULL;
1787 b->b_pluslen = 0;
1788 }
1789
1790 static void
pfsync_sendout(int schedswi,int c)1791 pfsync_sendout(int schedswi, int c)
1792 {
1793 struct pfsync_softc *sc = V_pfsyncif;
1794 struct ifnet *ifp = sc->sc_ifp;
1795 struct mbuf *m;
1796 struct pfsync_header *ph;
1797 struct pfsync_subheader *subh;
1798 struct pf_kstate *st, *st_next;
1799 struct pfsync_upd_req_item *ur;
1800 struct pfsync_bucket *b = &sc->sc_buckets[c];
1801 size_t len;
1802 int aflen, offset, count = 0;
1803 enum pfsync_q_id q;
1804
1805 KASSERT(sc != NULL, ("%s: null sc", __func__));
1806 KASSERT(b->b_len > PFSYNC_MINPKT,
1807 ("%s: sc_len %zu", __func__, b->b_len));
1808 PFSYNC_BUCKET_LOCK_ASSERT(b);
1809
1810 if (!bpf_peers_present(ifp->if_bpf) && sc->sc_sync_if == NULL) {
1811 pfsync_drop(sc, c);
1812 return;
1813 }
1814
1815 m = m_get2(max_linkhdr + b->b_len, M_NOWAIT, MT_DATA, M_PKTHDR);
1816 if (m == NULL) {
1817 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
1818 V_pfsyncstats.pfsyncs_onomem++;
1819 return;
1820 }
1821 m->m_data += max_linkhdr;
1822 bzero(m->m_data, b->b_len);
1823
1824 len = b->b_len;
1825
1826 /* build the ip header */
1827 switch (sc->sc_sync_peer.ss_family) {
1828 #ifdef INET
1829 case AF_INET:
1830 {
1831 struct ip *ip;
1832
1833 ip = mtod(m, struct ip *);
1834 bcopy(&sc->sc_template.ipv4, ip, sizeof(*ip));
1835 aflen = offset = sizeof(*ip);
1836
1837 len -= sizeof(union inet_template) - sizeof(struct ip);
1838 ip->ip_len = htons(len);
1839 ip_fillid(ip);
1840 break;
1841 }
1842 #endif
1843 #ifdef INET6
1844 case AF_INET6:
1845 {
1846 struct ip6_hdr *ip6;
1847
1848 ip6 = mtod(m, struct ip6_hdr *);
1849 bcopy(&sc->sc_template.ipv6, ip6, sizeof(*ip6));
1850 aflen = offset = sizeof(*ip6);
1851
1852 len -= sizeof(union inet_template) - sizeof(struct ip6_hdr);
1853 ip6->ip6_plen = htons(len);
1854 break;
1855 }
1856 #endif
1857 default:
1858 m_freem(m);
1859 pfsync_drop(sc, c);
1860 return;
1861 }
1862 m->m_len = m->m_pkthdr.len = len;
1863
1864 /* build the pfsync header */
1865 ph = (struct pfsync_header *)(m->m_data + offset);
1866 offset += sizeof(*ph);
1867
1868 ph->version = PFSYNC_VERSION;
1869 ph->len = htons(len - aflen);
1870 bcopy(V_pf_status.pf_chksum, ph->pfcksum, PF_MD5_DIGEST_LENGTH);
1871
1872 /* walk the queues */
1873 for (q = 0; q < PFSYNC_Q_COUNT; q++) {
1874 if (TAILQ_EMPTY(&b->b_qs[q]))
1875 continue;
1876
1877 subh = (struct pfsync_subheader *)(m->m_data + offset);
1878 offset += sizeof(*subh);
1879
1880 count = 0;
1881 TAILQ_FOREACH_SAFE(st, &b->b_qs[q], sync_list, st_next) {
1882 KASSERT(st->sync_state == pfsync_qid_sstate[q],
1883 ("%s: st->sync_state == q",
1884 __func__));
1885 /*
1886 * XXXGL: some of write methods do unlocked reads
1887 * of state data :(
1888 */
1889 pfsync_qs[q].write(st, m->m_data + offset);
1890 offset += pfsync_qs[q].len;
1891 st->sync_state = PFSYNC_S_NONE;
1892 pf_release_state(st);
1893 count++;
1894 }
1895 TAILQ_INIT(&b->b_qs[q]);
1896
1897 subh->action = pfsync_qs[q].action;
1898 subh->count = htons(count);
1899 V_pfsyncstats.pfsyncs_oacts[pfsync_qs[q].action] += count;
1900 }
1901
1902 if (!TAILQ_EMPTY(&b->b_upd_req_list)) {
1903 subh = (struct pfsync_subheader *)(m->m_data + offset);
1904 offset += sizeof(*subh);
1905
1906 count = 0;
1907 while ((ur = TAILQ_FIRST(&b->b_upd_req_list)) != NULL) {
1908 TAILQ_REMOVE(&b->b_upd_req_list, ur, ur_entry);
1909
1910 bcopy(&ur->ur_msg, m->m_data + offset,
1911 sizeof(ur->ur_msg));
1912 offset += sizeof(ur->ur_msg);
1913 free(ur, M_PFSYNC);
1914 count++;
1915 }
1916
1917 subh->action = PFSYNC_ACT_UPD_REQ;
1918 subh->count = htons(count);
1919 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_UPD_REQ] += count;
1920 }
1921
1922 /* has someone built a custom region for us to add? */
1923 if (b->b_plus != NULL) {
1924 bcopy(b->b_plus, m->m_data + offset, b->b_pluslen);
1925 offset += b->b_pluslen;
1926
1927 free(b->b_plus, M_PFSYNC);
1928 b->b_plus = NULL;
1929 b->b_pluslen = 0;
1930 }
1931
1932 subh = (struct pfsync_subheader *)(m->m_data + offset);
1933 offset += sizeof(*subh);
1934
1935 subh->action = PFSYNC_ACT_EOF;
1936 subh->count = htons(1);
1937 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_EOF]++;
1938
1939 /* we're done, let's put it on the wire */
1940 if (bpf_peers_present(ifp->if_bpf)) {
1941 m->m_data += aflen;
1942 m->m_len = m->m_pkthdr.len = len - aflen;
1943 bpf_mtap(ifp->if_bpf, m);
1944 m->m_data -= aflen;
1945 m->m_len = m->m_pkthdr.len = len;
1946 }
1947
1948 if (sc->sc_sync_if == NULL) {
1949 b->b_len = PFSYNC_MINPKT;
1950 m_freem(m);
1951 return;
1952 }
1953
1954 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1);
1955 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len);
1956 b->b_len = PFSYNC_MINPKT;
1957
1958 if (!_IF_QFULL(&b->b_snd))
1959 _IF_ENQUEUE(&b->b_snd, m);
1960 else {
1961 m_freem(m);
1962 if_inc_counter(sc->sc_ifp, IFCOUNTER_OQDROPS, 1);
1963 }
1964 if (schedswi)
1965 swi_sched(V_pfsync_swi_cookie, 0);
1966 }
1967
1968 static void
pfsync_insert_state(struct pf_kstate * st)1969 pfsync_insert_state(struct pf_kstate *st)
1970 {
1971 struct pfsync_softc *sc = V_pfsyncif;
1972 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
1973
1974 if (st->state_flags & PFSTATE_NOSYNC)
1975 return;
1976
1977 if ((st->rule->rule_flag & PFRULE_NOSYNC) ||
1978 st->key[PF_SK_WIRE]->proto == IPPROTO_PFSYNC) {
1979 st->state_flags |= PFSTATE_NOSYNC;
1980 return;
1981 }
1982
1983 KASSERT(st->sync_state == PFSYNC_S_NONE,
1984 ("%s: st->sync_state %u", __func__, st->sync_state));
1985
1986 PFSYNC_BUCKET_LOCK(b);
1987 if (b->b_len == PFSYNC_MINPKT)
1988 callout_reset(&b->b_tmo, 1 * hz, pfsync_timeout, b);
1989
1990 pfsync_q_ins(st, PFSYNC_S_INS, true);
1991 PFSYNC_BUCKET_UNLOCK(b);
1992
1993 st->sync_updates = 0;
1994 }
1995
1996 static int
pfsync_defer(struct pf_kstate * st,struct mbuf * m)1997 pfsync_defer(struct pf_kstate *st, struct mbuf *m)
1998 {
1999 struct pfsync_softc *sc = V_pfsyncif;
2000 struct pfsync_deferral *pd;
2001 struct pfsync_bucket *b;
2002
2003 if (m->m_flags & (M_BCAST|M_MCAST))
2004 return (0);
2005
2006 if (sc == NULL)
2007 return (0);
2008
2009 b = pfsync_get_bucket(sc, st);
2010
2011 PFSYNC_LOCK(sc);
2012
2013 if (!(sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) ||
2014 !(sc->sc_flags & PFSYNCF_DEFER)) {
2015 PFSYNC_UNLOCK(sc);
2016 return (0);
2017 }
2018
2019 PFSYNC_BUCKET_LOCK(b);
2020 PFSYNC_UNLOCK(sc);
2021
2022 if (b->b_deferred >= 128)
2023 pfsync_undefer(TAILQ_FIRST(&b->b_deferrals), 0);
2024
2025 pd = malloc(sizeof(*pd), M_PFSYNC, M_NOWAIT);
2026 if (pd == NULL) {
2027 PFSYNC_BUCKET_UNLOCK(b);
2028 return (0);
2029 }
2030 b->b_deferred++;
2031
2032 m->m_flags |= M_SKIP_FIREWALL;
2033 st->state_flags |= PFSTATE_ACK;
2034
2035 pd->pd_sc = sc;
2036 pd->pd_st = st;
2037 pf_ref_state(st);
2038 pd->pd_m = m;
2039
2040 TAILQ_INSERT_TAIL(&b->b_deferrals, pd, pd_entry);
2041 callout_init_mtx(&pd->pd_tmo, &b->b_mtx, CALLOUT_RETURNUNLOCKED);
2042 callout_reset(&pd->pd_tmo, (V_pfsync_defer_timeout * hz) / 1000,
2043 pfsync_defer_tmo, pd);
2044
2045 pfsync_push(b);
2046 PFSYNC_BUCKET_UNLOCK(b);
2047
2048 return (1);
2049 }
2050
2051 static void
pfsync_undefer(struct pfsync_deferral * pd,int drop)2052 pfsync_undefer(struct pfsync_deferral *pd, int drop)
2053 {
2054 struct pfsync_softc *sc = pd->pd_sc;
2055 struct mbuf *m = pd->pd_m;
2056 struct pf_kstate *st = pd->pd_st;
2057 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
2058
2059 PFSYNC_BUCKET_LOCK_ASSERT(b);
2060
2061 TAILQ_REMOVE(&b->b_deferrals, pd, pd_entry);
2062 b->b_deferred--;
2063 pd->pd_st->state_flags &= ~PFSTATE_ACK; /* XXX: locking! */
2064 free(pd, M_PFSYNC);
2065 pf_release_state(st);
2066
2067 if (drop)
2068 m_freem(m);
2069 else {
2070 _IF_ENQUEUE(&b->b_snd, m);
2071 pfsync_push(b);
2072 }
2073 }
2074
2075 static void
pfsync_defer_tmo(void * arg)2076 pfsync_defer_tmo(void *arg)
2077 {
2078 struct epoch_tracker et;
2079 struct pfsync_deferral *pd = arg;
2080 struct pfsync_softc *sc = pd->pd_sc;
2081 struct mbuf *m = pd->pd_m;
2082 struct pf_kstate *st = pd->pd_st;
2083 struct pfsync_bucket *b;
2084
2085 CURVNET_SET(sc->sc_ifp->if_vnet);
2086
2087 b = pfsync_get_bucket(sc, st);
2088
2089 PFSYNC_BUCKET_LOCK_ASSERT(b);
2090
2091 TAILQ_REMOVE(&b->b_deferrals, pd, pd_entry);
2092 b->b_deferred--;
2093 pd->pd_st->state_flags &= ~PFSTATE_ACK; /* XXX: locking! */
2094 PFSYNC_BUCKET_UNLOCK(b);
2095 free(pd, M_PFSYNC);
2096
2097 if (sc->sc_sync_if == NULL) {
2098 pf_release_state(st);
2099 m_freem(m);
2100 CURVNET_RESTORE();
2101 return;
2102 }
2103
2104 NET_EPOCH_ENTER(et);
2105
2106 pfsync_tx(sc, m);
2107
2108 pf_release_state(st);
2109
2110 CURVNET_RESTORE();
2111 NET_EPOCH_EXIT(et);
2112 }
2113
2114 static void
pfsync_undefer_state_locked(struct pf_kstate * st,int drop)2115 pfsync_undefer_state_locked(struct pf_kstate *st, int drop)
2116 {
2117 struct pfsync_softc *sc = V_pfsyncif;
2118 struct pfsync_deferral *pd;
2119 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
2120
2121 PFSYNC_BUCKET_LOCK_ASSERT(b);
2122
2123 TAILQ_FOREACH(pd, &b->b_deferrals, pd_entry) {
2124 if (pd->pd_st == st) {
2125 if (callout_stop(&pd->pd_tmo) > 0)
2126 pfsync_undefer(pd, drop);
2127
2128 return;
2129 }
2130 }
2131
2132 panic("%s: unable to find deferred state", __func__);
2133 }
2134
2135 static void
pfsync_undefer_state(struct pf_kstate * st,int drop)2136 pfsync_undefer_state(struct pf_kstate *st, int drop)
2137 {
2138 struct pfsync_softc *sc = V_pfsyncif;
2139 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
2140
2141 PFSYNC_BUCKET_LOCK(b);
2142 pfsync_undefer_state_locked(st, drop);
2143 PFSYNC_BUCKET_UNLOCK(b);
2144 }
2145
2146 static struct pfsync_bucket*
pfsync_get_bucket(struct pfsync_softc * sc,struct pf_kstate * st)2147 pfsync_get_bucket(struct pfsync_softc *sc, struct pf_kstate *st)
2148 {
2149 int c = PF_IDHASH(st) % pfsync_buckets;
2150 return &sc->sc_buckets[c];
2151 }
2152
2153 static void
pfsync_update_state(struct pf_kstate * st)2154 pfsync_update_state(struct pf_kstate *st)
2155 {
2156 struct pfsync_softc *sc = V_pfsyncif;
2157 bool sync = false, ref = true;
2158 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
2159
2160 PF_STATE_LOCK_ASSERT(st);
2161 PFSYNC_BUCKET_LOCK(b);
2162
2163 if (st->state_flags & PFSTATE_ACK)
2164 pfsync_undefer_state_locked(st, 0);
2165 if (st->state_flags & PFSTATE_NOSYNC) {
2166 if (st->sync_state != PFSYNC_S_NONE)
2167 pfsync_q_del(st, true, b);
2168 PFSYNC_BUCKET_UNLOCK(b);
2169 return;
2170 }
2171
2172 if (b->b_len == PFSYNC_MINPKT)
2173 callout_reset(&b->b_tmo, 1 * hz, pfsync_timeout, b);
2174
2175 switch (st->sync_state) {
2176 case PFSYNC_S_UPD_C:
2177 case PFSYNC_S_UPD:
2178 case PFSYNC_S_INS:
2179 /* we're already handling it */
2180
2181 if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP) {
2182 st->sync_updates++;
2183 if (st->sync_updates >= sc->sc_maxupdates)
2184 sync = true;
2185 }
2186 break;
2187
2188 case PFSYNC_S_IACK:
2189 pfsync_q_del(st, false, b);
2190 ref = false;
2191 /* FALLTHROUGH */
2192
2193 case PFSYNC_S_NONE:
2194 pfsync_q_ins(st, PFSYNC_S_UPD_C, ref);
2195 st->sync_updates = 0;
2196 break;
2197
2198 default:
2199 panic("%s: unexpected sync state %d", __func__, st->sync_state);
2200 }
2201
2202 if (sync || (time_uptime - st->pfsync_time) < 2)
2203 pfsync_push(b);
2204
2205 PFSYNC_BUCKET_UNLOCK(b);
2206 }
2207
2208 static void
pfsync_request_update(u_int32_t creatorid,u_int64_t id)2209 pfsync_request_update(u_int32_t creatorid, u_int64_t id)
2210 {
2211 struct pfsync_softc *sc = V_pfsyncif;
2212 struct pfsync_bucket *b = &sc->sc_buckets[0];
2213 struct pfsync_upd_req_item *item;
2214 size_t nlen = sizeof(struct pfsync_upd_req);
2215
2216 PFSYNC_BUCKET_LOCK_ASSERT(b);
2217
2218 /*
2219 * This code does a bit to prevent multiple update requests for the
2220 * same state being generated. It searches current subheader queue,
2221 * but it doesn't lookup into queue of already packed datagrams.
2222 */
2223 TAILQ_FOREACH(item, &b->b_upd_req_list, ur_entry)
2224 if (item->ur_msg.id == id &&
2225 item->ur_msg.creatorid == creatorid)
2226 return;
2227
2228 item = malloc(sizeof(*item), M_PFSYNC, M_NOWAIT);
2229 if (item == NULL)
2230 return; /* XXX stats */
2231
2232 item->ur_msg.id = id;
2233 item->ur_msg.creatorid = creatorid;
2234
2235 if (TAILQ_EMPTY(&b->b_upd_req_list))
2236 nlen += sizeof(struct pfsync_subheader);
2237
2238 if (b->b_len + nlen > sc->sc_ifp->if_mtu) {
2239 pfsync_sendout(0, 0);
2240
2241 nlen = sizeof(struct pfsync_subheader) +
2242 sizeof(struct pfsync_upd_req);
2243 }
2244
2245 TAILQ_INSERT_TAIL(&b->b_upd_req_list, item, ur_entry);
2246 b->b_len += nlen;
2247
2248 pfsync_push(b);
2249 }
2250
2251 static bool
pfsync_update_state_req(struct pf_kstate * st)2252 pfsync_update_state_req(struct pf_kstate *st)
2253 {
2254 struct pfsync_softc *sc = V_pfsyncif;
2255 bool ref = true, full = false;
2256 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
2257
2258 PF_STATE_LOCK_ASSERT(st);
2259 PFSYNC_BUCKET_LOCK(b);
2260
2261 if (st->state_flags & PFSTATE_NOSYNC) {
2262 if (st->sync_state != PFSYNC_S_NONE)
2263 pfsync_q_del(st, true, b);
2264 PFSYNC_BUCKET_UNLOCK(b);
2265 return (full);
2266 }
2267
2268 switch (st->sync_state) {
2269 case PFSYNC_S_UPD_C:
2270 case PFSYNC_S_IACK:
2271 pfsync_q_del(st, false, b);
2272 ref = false;
2273 /* FALLTHROUGH */
2274
2275 case PFSYNC_S_NONE:
2276 pfsync_q_ins(st, PFSYNC_S_UPD, ref);
2277 pfsync_push(b);
2278 break;
2279
2280 case PFSYNC_S_INS:
2281 case PFSYNC_S_UPD:
2282 case PFSYNC_S_DEL_C:
2283 /* we're already handling it */
2284 break;
2285
2286 default:
2287 panic("%s: unexpected sync state %d", __func__, st->sync_state);
2288 }
2289
2290 if ((sc->sc_ifp->if_mtu - b->b_len) < sizeof(union pfsync_state_union))
2291 full = true;
2292
2293 PFSYNC_BUCKET_UNLOCK(b);
2294
2295 return (full);
2296 }
2297
2298 static void
pfsync_delete_state(struct pf_kstate * st)2299 pfsync_delete_state(struct pf_kstate *st)
2300 {
2301 struct pfsync_softc *sc = V_pfsyncif;
2302 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
2303 bool ref = true;
2304
2305 PFSYNC_BUCKET_LOCK(b);
2306 if (st->state_flags & PFSTATE_ACK)
2307 pfsync_undefer_state_locked(st, 1);
2308 if (st->state_flags & PFSTATE_NOSYNC) {
2309 if (st->sync_state != PFSYNC_S_NONE)
2310 pfsync_q_del(st, true, b);
2311 PFSYNC_BUCKET_UNLOCK(b);
2312 return;
2313 }
2314
2315 if (b->b_len == PFSYNC_MINPKT)
2316 callout_reset(&b->b_tmo, 1 * hz, pfsync_timeout, b);
2317
2318 switch (st->sync_state) {
2319 case PFSYNC_S_INS:
2320 /* We never got to tell the world so just forget about it. */
2321 pfsync_q_del(st, true, b);
2322 break;
2323
2324 case PFSYNC_S_UPD_C:
2325 case PFSYNC_S_UPD:
2326 case PFSYNC_S_IACK:
2327 pfsync_q_del(st, false, b);
2328 ref = false;
2329 /* FALLTHROUGH */
2330
2331 case PFSYNC_S_NONE:
2332 pfsync_q_ins(st, PFSYNC_S_DEL_C, ref);
2333 break;
2334
2335 default:
2336 panic("%s: unexpected sync state %d", __func__, st->sync_state);
2337 }
2338
2339 PFSYNC_BUCKET_UNLOCK(b);
2340 }
2341
2342 static void
pfsync_clear_states(u_int32_t creatorid,const char * ifname)2343 pfsync_clear_states(u_int32_t creatorid, const char *ifname)
2344 {
2345 struct {
2346 struct pfsync_subheader subh;
2347 struct pfsync_clr clr;
2348 } __packed r;
2349
2350 bzero(&r, sizeof(r));
2351
2352 r.subh.action = PFSYNC_ACT_CLR;
2353 r.subh.count = htons(1);
2354 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_CLR]++;
2355
2356 strlcpy(r.clr.ifname, ifname, sizeof(r.clr.ifname));
2357 r.clr.creatorid = creatorid;
2358
2359 pfsync_send_plus(&r, sizeof(r));
2360 }
2361
2362 static enum pfsync_q_id
pfsync_sstate_to_qid(u_int8_t sync_state)2363 pfsync_sstate_to_qid(u_int8_t sync_state)
2364 {
2365 struct pfsync_softc *sc = V_pfsyncif;
2366
2367 switch (sync_state) {
2368 case PFSYNC_S_INS:
2369 switch (sc->sc_version) {
2370 case PFSYNC_MSG_VERSION_1301:
2371 return PFSYNC_Q_INS_1301;
2372 case PFSYNC_MSG_VERSION_1400:
2373 return PFSYNC_Q_INS_1400;
2374 }
2375 break;
2376 case PFSYNC_S_IACK:
2377 return PFSYNC_Q_IACK;
2378 case PFSYNC_S_UPD:
2379 switch (sc->sc_version) {
2380 case PFSYNC_MSG_VERSION_1301:
2381 return PFSYNC_Q_UPD_1301;
2382 case PFSYNC_MSG_VERSION_1400:
2383 return PFSYNC_Q_UPD_1400;
2384 }
2385 break;
2386 case PFSYNC_S_UPD_C:
2387 return PFSYNC_Q_UPD_C;
2388 case PFSYNC_S_DEL_C:
2389 return PFSYNC_Q_DEL_C;
2390 default:
2391 panic("%s: Unsupported st->sync_state 0x%02x",
2392 __func__, sync_state);
2393 }
2394
2395 panic("%s: Unsupported pfsync_msg_version %d",
2396 __func__, sc->sc_version);
2397 }
2398
2399 static void
pfsync_q_ins(struct pf_kstate * st,int sync_state,bool ref)2400 pfsync_q_ins(struct pf_kstate *st, int sync_state, bool ref)
2401 {
2402 enum pfsync_q_id q = pfsync_sstate_to_qid(sync_state);
2403 struct pfsync_softc *sc = V_pfsyncif;
2404 size_t nlen = pfsync_qs[q].len;
2405 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
2406
2407 PFSYNC_BUCKET_LOCK_ASSERT(b);
2408
2409 KASSERT(st->sync_state == PFSYNC_S_NONE,
2410 ("%s: st->sync_state %u", __func__, st->sync_state));
2411 KASSERT(b->b_len >= PFSYNC_MINPKT, ("pfsync pkt len is too low %zu",
2412 b->b_len));
2413
2414 if (TAILQ_EMPTY(&b->b_qs[q]))
2415 nlen += sizeof(struct pfsync_subheader);
2416
2417 if (b->b_len + nlen > sc->sc_ifp->if_mtu) {
2418 pfsync_sendout(1, b->b_id);
2419
2420 nlen = sizeof(struct pfsync_subheader) + pfsync_qs[q].len;
2421 }
2422
2423 b->b_len += nlen;
2424 st->sync_state = pfsync_qid_sstate[q];
2425 TAILQ_INSERT_TAIL(&b->b_qs[q], st, sync_list);
2426 if (ref)
2427 pf_ref_state(st);
2428 }
2429
2430 static void
pfsync_q_del(struct pf_kstate * st,bool unref,struct pfsync_bucket * b)2431 pfsync_q_del(struct pf_kstate *st, bool unref, struct pfsync_bucket *b)
2432 {
2433 enum pfsync_q_id q;
2434
2435 PFSYNC_BUCKET_LOCK_ASSERT(b);
2436 KASSERT(st->sync_state != PFSYNC_S_NONE,
2437 ("%s: st->sync_state != PFSYNC_S_NONE", __func__));
2438
2439 q = pfsync_sstate_to_qid(st->sync_state);
2440 b->b_len -= pfsync_qs[q].len;
2441 TAILQ_REMOVE(&b->b_qs[q], st, sync_list);
2442 st->sync_state = PFSYNC_S_NONE;
2443 if (unref)
2444 pf_release_state(st);
2445
2446 if (TAILQ_EMPTY(&b->b_qs[q]))
2447 b->b_len -= sizeof(struct pfsync_subheader);
2448 }
2449
2450 static void
pfsync_bulk_start(void)2451 pfsync_bulk_start(void)
2452 {
2453 struct pfsync_softc *sc = V_pfsyncif;
2454
2455 if (V_pf_status.debug >= PF_DEBUG_MISC)
2456 printf("pfsync: received bulk update request\n");
2457
2458 PFSYNC_BLOCK(sc);
2459
2460 sc->sc_ureq_received = time_uptime;
2461 sc->sc_bulk_hashid = 0;
2462 sc->sc_bulk_stateid = 0;
2463 pfsync_bulk_status(PFSYNC_BUS_START);
2464 callout_reset(&sc->sc_bulk_tmo, 1, pfsync_bulk_update, sc);
2465 PFSYNC_BUNLOCK(sc);
2466 }
2467
2468 static void
pfsync_bulk_update(void * arg)2469 pfsync_bulk_update(void *arg)
2470 {
2471 struct pfsync_softc *sc = arg;
2472 struct pf_kstate *s;
2473 int i;
2474
2475 PFSYNC_BLOCK_ASSERT(sc);
2476 CURVNET_SET(sc->sc_ifp->if_vnet);
2477
2478 /*
2479 * Start with last state from previous invocation.
2480 * It may had gone, in this case start from the
2481 * hash slot.
2482 */
2483 s = pf_find_state_byid(sc->sc_bulk_stateid, sc->sc_bulk_creatorid);
2484
2485 if (s != NULL)
2486 i = PF_IDHASH(s);
2487 else
2488 i = sc->sc_bulk_hashid;
2489
2490 for (; i <= V_pf_hashmask; i++) {
2491 struct pf_idhash *ih = &V_pf_idhash[i];
2492
2493 if (s != NULL)
2494 PF_HASHROW_ASSERT(ih);
2495 else {
2496 PF_HASHROW_LOCK(ih);
2497 s = LIST_FIRST(&ih->states);
2498 }
2499
2500 for (; s; s = LIST_NEXT(s, entry)) {
2501 if (s->sync_state == PFSYNC_S_NONE &&
2502 s->timeout < PFTM_MAX &&
2503 s->pfsync_time <= sc->sc_ureq_received) {
2504 if (pfsync_update_state_req(s)) {
2505 /* We've filled a packet. */
2506 sc->sc_bulk_hashid = i;
2507 sc->sc_bulk_stateid = s->id;
2508 sc->sc_bulk_creatorid = s->creatorid;
2509 PF_HASHROW_UNLOCK(ih);
2510 callout_reset(&sc->sc_bulk_tmo, 1,
2511 pfsync_bulk_update, sc);
2512 goto full;
2513 }
2514 }
2515 }
2516 PF_HASHROW_UNLOCK(ih);
2517 }
2518
2519 /* We're done. */
2520 pfsync_bulk_status(PFSYNC_BUS_END);
2521 full:
2522 CURVNET_RESTORE();
2523 }
2524
2525 static void
pfsync_bulk_status(u_int8_t status)2526 pfsync_bulk_status(u_int8_t status)
2527 {
2528 struct {
2529 struct pfsync_subheader subh;
2530 struct pfsync_bus bus;
2531 } __packed r;
2532
2533 struct pfsync_softc *sc = V_pfsyncif;
2534
2535 bzero(&r, sizeof(r));
2536
2537 r.subh.action = PFSYNC_ACT_BUS;
2538 r.subh.count = htons(1);
2539 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_BUS]++;
2540
2541 r.bus.creatorid = V_pf_status.hostid;
2542 r.bus.endtime = htonl(time_uptime - sc->sc_ureq_received);
2543 r.bus.status = status;
2544
2545 pfsync_send_plus(&r, sizeof(r));
2546 }
2547
2548 static void
pfsync_bulk_fail(void * arg)2549 pfsync_bulk_fail(void *arg)
2550 {
2551 struct pfsync_softc *sc = arg;
2552 struct pfsync_bucket *b = &sc->sc_buckets[0];
2553
2554 CURVNET_SET(sc->sc_ifp->if_vnet);
2555
2556 PFSYNC_BLOCK_ASSERT(sc);
2557
2558 if (sc->sc_bulk_tries++ < PFSYNC_MAX_BULKTRIES) {
2559 /* Try again */
2560 callout_reset(&sc->sc_bulkfail_tmo, 5 * hz,
2561 pfsync_bulk_fail, V_pfsyncif);
2562 PFSYNC_BUCKET_LOCK(b);
2563 pfsync_request_update(0, 0);
2564 PFSYNC_BUCKET_UNLOCK(b);
2565 } else {
2566 /* Pretend like the transfer was ok. */
2567 sc->sc_ureq_sent = 0;
2568 sc->sc_bulk_tries = 0;
2569 PFSYNC_LOCK(sc);
2570 if (!(sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p)
2571 (*carp_demote_adj_p)(-V_pfsync_carp_adj,
2572 "pfsync bulk fail");
2573 sc->sc_flags |= PFSYNCF_OK;
2574 PFSYNC_UNLOCK(sc);
2575 if (V_pf_status.debug >= PF_DEBUG_MISC)
2576 printf("pfsync: failed to receive bulk update\n");
2577 }
2578
2579 CURVNET_RESTORE();
2580 }
2581
2582 static void
pfsync_send_plus(void * plus,size_t pluslen)2583 pfsync_send_plus(void *plus, size_t pluslen)
2584 {
2585 struct pfsync_softc *sc = V_pfsyncif;
2586 struct pfsync_bucket *b = &sc->sc_buckets[0];
2587 uint8_t *newplus;
2588
2589 PFSYNC_BUCKET_LOCK(b);
2590
2591 if (b->b_len + pluslen > sc->sc_ifp->if_mtu)
2592 pfsync_sendout(1, b->b_id);
2593
2594 newplus = malloc(pluslen + b->b_pluslen, M_PFSYNC, M_NOWAIT);
2595 if (newplus == NULL)
2596 goto out;
2597
2598 if (b->b_plus != NULL) {
2599 memcpy(newplus, b->b_plus, b->b_pluslen);
2600 free(b->b_plus, M_PFSYNC);
2601 } else {
2602 MPASS(b->b_pluslen == 0);
2603 }
2604 memcpy(newplus + b->b_pluslen, plus, pluslen);
2605
2606 b->b_plus = newplus;
2607 b->b_pluslen += pluslen;
2608 b->b_len += pluslen;
2609
2610 pfsync_sendout(1, b->b_id);
2611
2612 out:
2613 PFSYNC_BUCKET_UNLOCK(b);
2614 }
2615
2616 static void
pfsync_timeout(void * arg)2617 pfsync_timeout(void *arg)
2618 {
2619 struct pfsync_bucket *b = arg;
2620
2621 CURVNET_SET(b->b_sc->sc_ifp->if_vnet);
2622 PFSYNC_BUCKET_LOCK(b);
2623 pfsync_push(b);
2624 PFSYNC_BUCKET_UNLOCK(b);
2625 CURVNET_RESTORE();
2626 }
2627
2628 static void
pfsync_push(struct pfsync_bucket * b)2629 pfsync_push(struct pfsync_bucket *b)
2630 {
2631
2632 PFSYNC_BUCKET_LOCK_ASSERT(b);
2633
2634 b->b_flags |= PFSYNCF_BUCKET_PUSH;
2635 swi_sched(V_pfsync_swi_cookie, 0);
2636 }
2637
2638 static void
pfsync_push_all(struct pfsync_softc * sc)2639 pfsync_push_all(struct pfsync_softc *sc)
2640 {
2641 int c;
2642 struct pfsync_bucket *b;
2643
2644 for (c = 0; c < pfsync_buckets; c++) {
2645 b = &sc->sc_buckets[c];
2646
2647 PFSYNC_BUCKET_LOCK(b);
2648 pfsync_push(b);
2649 PFSYNC_BUCKET_UNLOCK(b);
2650 }
2651 }
2652
2653 static void
pfsync_tx(struct pfsync_softc * sc,struct mbuf * m)2654 pfsync_tx(struct pfsync_softc *sc, struct mbuf *m)
2655 {
2656 struct ip *ip;
2657 int af, error = 0;
2658
2659 ip = mtod(m, struct ip *);
2660 MPASS(ip->ip_v == IPVERSION || ip->ip_v == (IPV6_VERSION >> 4));
2661
2662 af = ip->ip_v == IPVERSION ? AF_INET : AF_INET6;
2663
2664 /*
2665 * We distinguish between a deferral packet and our
2666 * own pfsync packet based on M_SKIP_FIREWALL
2667 * flag. This is XXX.
2668 */
2669 switch (af) {
2670 #ifdef INET
2671 case AF_INET:
2672 if (m->m_flags & M_SKIP_FIREWALL) {
2673 error = ip_output(m, NULL, NULL, 0,
2674 NULL, NULL);
2675 } else {
2676 error = ip_output(m, NULL, NULL,
2677 IP_RAWOUTPUT, &sc->sc_imo, NULL);
2678 }
2679 break;
2680 #endif
2681 #ifdef INET6
2682 case AF_INET6:
2683 if (m->m_flags & M_SKIP_FIREWALL) {
2684 error = ip6_output(m, NULL, NULL, 0,
2685 NULL, NULL, NULL);
2686 } else {
2687 error = ip6_output(m, NULL, NULL, 0,
2688 &sc->sc_im6o, NULL, NULL);
2689 }
2690 break;
2691 #endif
2692 }
2693
2694 if (error == 0)
2695 V_pfsyncstats.pfsyncs_opackets++;
2696 else
2697 V_pfsyncstats.pfsyncs_oerrors++;
2698
2699 }
2700
2701 static void
pfsyncintr(void * arg)2702 pfsyncintr(void *arg)
2703 {
2704 struct epoch_tracker et;
2705 struct pfsync_softc *sc = arg;
2706 struct pfsync_bucket *b;
2707 struct mbuf *m, *n;
2708 int c;
2709
2710 NET_EPOCH_ENTER(et);
2711 CURVNET_SET(sc->sc_ifp->if_vnet);
2712
2713 for (c = 0; c < pfsync_buckets; c++) {
2714 b = &sc->sc_buckets[c];
2715
2716 PFSYNC_BUCKET_LOCK(b);
2717 if ((b->b_flags & PFSYNCF_BUCKET_PUSH) && b->b_len > PFSYNC_MINPKT) {
2718 pfsync_sendout(0, b->b_id);
2719 b->b_flags &= ~PFSYNCF_BUCKET_PUSH;
2720 }
2721 _IF_DEQUEUE_ALL(&b->b_snd, m);
2722 PFSYNC_BUCKET_UNLOCK(b);
2723
2724 for (; m != NULL; m = n) {
2725 n = m->m_nextpkt;
2726 m->m_nextpkt = NULL;
2727
2728 pfsync_tx(sc, m);
2729 }
2730 }
2731 CURVNET_RESTORE();
2732 NET_EPOCH_EXIT(et);
2733 }
2734
2735 static int
pfsync_multicast_setup(struct pfsync_softc * sc,struct ifnet * ifp,struct in_mfilter * imf,struct in6_mfilter * im6f)2736 pfsync_multicast_setup(struct pfsync_softc *sc, struct ifnet *ifp,
2737 struct in_mfilter* imf, struct in6_mfilter* im6f)
2738 {
2739 #ifdef INET
2740 struct ip_moptions *imo = &sc->sc_imo;
2741 #endif
2742 #ifdef INET6
2743 struct ip6_moptions *im6o = &sc->sc_im6o;
2744 struct sockaddr_in6 *syncpeer_sa6 = NULL;
2745 #endif
2746
2747 if (!(ifp->if_flags & IFF_MULTICAST))
2748 return (EADDRNOTAVAIL);
2749
2750 switch (sc->sc_sync_peer.ss_family) {
2751 #ifdef INET
2752 case AF_INET:
2753 {
2754 int error;
2755
2756 ip_mfilter_init(&imo->imo_head);
2757 imo->imo_multicast_vif = -1;
2758 if ((error = in_joingroup(ifp,
2759 &((struct sockaddr_in *)&sc->sc_sync_peer)->sin_addr, NULL,
2760 &imf->imf_inm)) != 0)
2761 return (error);
2762
2763 ip_mfilter_insert(&imo->imo_head, imf);
2764 imo->imo_multicast_ifp = ifp;
2765 imo->imo_multicast_ttl = PFSYNC_DFLTTL;
2766 imo->imo_multicast_loop = 0;
2767 break;
2768 }
2769 #endif
2770 #ifdef INET6
2771 case AF_INET6:
2772 {
2773 int error;
2774
2775 syncpeer_sa6 = (struct sockaddr_in6 *)&sc->sc_sync_peer;
2776 if ((error = in6_setscope(&syncpeer_sa6->sin6_addr, ifp, NULL)))
2777 return (error);
2778
2779 ip6_mfilter_init(&im6o->im6o_head);
2780 if ((error = in6_joingroup(ifp, &syncpeer_sa6->sin6_addr, NULL,
2781 &(im6f->im6f_in6m), 0)) != 0)
2782 return (error);
2783
2784 ip6_mfilter_insert(&im6o->im6o_head, im6f);
2785 im6o->im6o_multicast_ifp = ifp;
2786 im6o->im6o_multicast_hlim = PFSYNC_DFLTTL;
2787 im6o->im6o_multicast_loop = 0;
2788 break;
2789 }
2790 #endif
2791 }
2792
2793 return (0);
2794 }
2795
2796 static void
pfsync_multicast_cleanup(struct pfsync_softc * sc)2797 pfsync_multicast_cleanup(struct pfsync_softc *sc)
2798 {
2799 #ifdef INET
2800 struct ip_moptions *imo = &sc->sc_imo;
2801 struct in_mfilter *imf;
2802
2803 while ((imf = ip_mfilter_first(&imo->imo_head)) != NULL) {
2804 ip_mfilter_remove(&imo->imo_head, imf);
2805 in_leavegroup(imf->imf_inm, NULL);
2806 ip_mfilter_free(imf);
2807 }
2808 imo->imo_multicast_ifp = NULL;
2809 #endif
2810
2811 #ifdef INET6
2812 struct ip6_moptions *im6o = &sc->sc_im6o;
2813 struct in6_mfilter *im6f;
2814
2815 while ((im6f = ip6_mfilter_first(&im6o->im6o_head)) != NULL) {
2816 ip6_mfilter_remove(&im6o->im6o_head, im6f);
2817 in6_leavegroup(im6f->im6f_in6m, NULL);
2818 ip6_mfilter_free(im6f);
2819 }
2820 im6o->im6o_multicast_ifp = NULL;
2821 #endif
2822 }
2823
2824 void
pfsync_detach_ifnet(struct ifnet * ifp)2825 pfsync_detach_ifnet(struct ifnet *ifp)
2826 {
2827 struct pfsync_softc *sc = V_pfsyncif;
2828
2829 if (sc == NULL)
2830 return;
2831
2832 PFSYNC_LOCK(sc);
2833
2834 if (sc->sc_sync_if == ifp) {
2835 /* We don't need mutlicast cleanup here, because the interface
2836 * is going away. We do need to ensure we don't try to do
2837 * cleanup later.
2838 */
2839 ip_mfilter_init(&sc->sc_imo.imo_head);
2840 sc->sc_imo.imo_multicast_ifp = NULL;
2841 sc->sc_im6o.im6o_multicast_ifp = NULL;
2842 sc->sc_sync_if = NULL;
2843 }
2844
2845 PFSYNC_UNLOCK(sc);
2846 }
2847
2848 static int
pfsync_pfsyncreq_to_kstatus(struct pfsyncreq * pfsyncr,struct pfsync_kstatus * status)2849 pfsync_pfsyncreq_to_kstatus(struct pfsyncreq *pfsyncr, struct pfsync_kstatus *status)
2850 {
2851 struct sockaddr_storage sa;
2852 status->maxupdates = pfsyncr->pfsyncr_maxupdates;
2853 status->flags = pfsyncr->pfsyncr_defer;
2854
2855 strlcpy(status->syncdev, pfsyncr->pfsyncr_syncdev, IFNAMSIZ);
2856
2857 memset(&sa, 0, sizeof(sa));
2858 if (pfsyncr->pfsyncr_syncpeer.s_addr != 0) {
2859 struct sockaddr_in *in = (struct sockaddr_in *)&sa;
2860 in->sin_family = AF_INET;
2861 in->sin_len = sizeof(*in);
2862 in->sin_addr.s_addr = pfsyncr->pfsyncr_syncpeer.s_addr;
2863 }
2864 status->syncpeer = sa;
2865
2866 return 0;
2867 }
2868
2869 static int
pfsync_kstatus_to_softc(struct pfsync_kstatus * status,struct pfsync_softc * sc)2870 pfsync_kstatus_to_softc(struct pfsync_kstatus *status, struct pfsync_softc *sc)
2871 {
2872 struct ifnet *sifp;
2873 struct in_mfilter *imf = NULL;
2874 struct in6_mfilter *im6f = NULL;
2875 int error;
2876 int c;
2877
2878 if ((status->maxupdates < 0) || (status->maxupdates > 255))
2879 return (EINVAL);
2880
2881 if (status->syncdev[0] == '\0')
2882 sifp = NULL;
2883 else if ((sifp = ifunit_ref(status->syncdev)) == NULL)
2884 return (EINVAL);
2885
2886 switch (status->syncpeer.ss_family) {
2887 #ifdef INET
2888 case AF_UNSPEC:
2889 case AF_INET: {
2890 struct sockaddr_in *status_sin;
2891 status_sin = (struct sockaddr_in *)&(status->syncpeer);
2892 if (sifp != NULL) {
2893 if (status_sin->sin_addr.s_addr == 0 ||
2894 status_sin->sin_addr.s_addr ==
2895 htonl(INADDR_PFSYNC_GROUP)) {
2896 status_sin->sin_family = AF_INET;
2897 status_sin->sin_len = sizeof(*status_sin);
2898 status_sin->sin_addr.s_addr =
2899 htonl(INADDR_PFSYNC_GROUP);
2900 }
2901
2902 if (IN_MULTICAST(ntohl(status_sin->sin_addr.s_addr))) {
2903 imf = ip_mfilter_alloc(M_WAITOK, 0, 0);
2904 }
2905 }
2906 break;
2907 }
2908 #endif
2909 #ifdef INET6
2910 case AF_INET6: {
2911 struct sockaddr_in6 *status_sin6;
2912 status_sin6 = (struct sockaddr_in6*)&(status->syncpeer);
2913 if (sifp != NULL) {
2914 if (IN6_IS_ADDR_UNSPECIFIED(&status_sin6->sin6_addr) ||
2915 IN6_ARE_ADDR_EQUAL(&status_sin6->sin6_addr,
2916 &in6addr_linklocal_pfsync_group)) {
2917 status_sin6->sin6_family = AF_INET6;
2918 status_sin6->sin6_len = sizeof(*status_sin6);
2919 status_sin6->sin6_addr =
2920 in6addr_linklocal_pfsync_group;
2921 }
2922
2923 if (IN6_IS_ADDR_MULTICAST(&status_sin6->sin6_addr)) {
2924 im6f = ip6_mfilter_alloc(M_WAITOK, 0, 0);
2925 }
2926 }
2927 break;
2928 }
2929 #endif
2930 }
2931
2932 PFSYNC_LOCK(sc);
2933
2934 switch (status->version) {
2935 case PFSYNC_MSG_VERSION_UNSPECIFIED:
2936 sc->sc_version = PFSYNC_MSG_VERSION_DEFAULT;
2937 break;
2938 case PFSYNC_MSG_VERSION_1301:
2939 case PFSYNC_MSG_VERSION_1400:
2940 sc->sc_version = status->version;
2941 break;
2942 default:
2943 PFSYNC_UNLOCK(sc);
2944 return (EINVAL);
2945 }
2946
2947 switch (status->syncpeer.ss_family) {
2948 case AF_INET: {
2949 struct sockaddr_in *status_sin = (struct sockaddr_in *)&(status->syncpeer);
2950 struct sockaddr_in *sc_sin = (struct sockaddr_in *)&sc->sc_sync_peer;
2951 sc_sin->sin_family = AF_INET;
2952 sc_sin->sin_len = sizeof(*sc_sin);
2953 if (status_sin->sin_addr.s_addr == 0) {
2954 sc_sin->sin_addr.s_addr = htonl(INADDR_PFSYNC_GROUP);
2955 } else {
2956 sc_sin->sin_addr.s_addr = status_sin->sin_addr.s_addr;
2957 }
2958 break;
2959 }
2960 case AF_INET6: {
2961 struct sockaddr_in6 *status_sin = (struct sockaddr_in6 *)&(status->syncpeer);
2962 struct sockaddr_in6 *sc_sin = (struct sockaddr_in6 *)&sc->sc_sync_peer;
2963 sc_sin->sin6_family = AF_INET6;
2964 sc_sin->sin6_len = sizeof(*sc_sin);
2965 if(IN6_IS_ADDR_UNSPECIFIED(&status_sin->sin6_addr)) {
2966 sc_sin->sin6_addr = in6addr_linklocal_pfsync_group;
2967 } else {
2968 sc_sin->sin6_addr = status_sin->sin6_addr;
2969 }
2970 break;
2971 }
2972 }
2973
2974 sc->sc_maxupdates = status->maxupdates;
2975 if (status->flags & PFSYNCF_DEFER) {
2976 sc->sc_flags |= PFSYNCF_DEFER;
2977 V_pfsync_defer_ptr = pfsync_defer;
2978 } else {
2979 sc->sc_flags &= ~PFSYNCF_DEFER;
2980 V_pfsync_defer_ptr = NULL;
2981 }
2982
2983 if (sifp == NULL) {
2984 if (sc->sc_sync_if)
2985 if_rele(sc->sc_sync_if);
2986 sc->sc_sync_if = NULL;
2987 pfsync_multicast_cleanup(sc);
2988 PFSYNC_UNLOCK(sc);
2989 return (0);
2990 }
2991
2992 for (c = 0; c < pfsync_buckets; c++) {
2993 PFSYNC_BUCKET_LOCK(&sc->sc_buckets[c]);
2994 if (sc->sc_buckets[c].b_len > PFSYNC_MINPKT &&
2995 (sifp->if_mtu < sc->sc_ifp->if_mtu ||
2996 (sc->sc_sync_if != NULL &&
2997 sifp->if_mtu < sc->sc_sync_if->if_mtu) ||
2998 sifp->if_mtu < MCLBYTES - sizeof(struct ip)))
2999 pfsync_sendout(1, c);
3000 PFSYNC_BUCKET_UNLOCK(&sc->sc_buckets[c]);
3001 }
3002
3003 pfsync_multicast_cleanup(sc);
3004
3005 if (((sc->sc_sync_peer.ss_family == AF_INET) &&
3006 IN_MULTICAST(ntohl(((struct sockaddr_in *)
3007 &sc->sc_sync_peer)->sin_addr.s_addr))) ||
3008 ((sc->sc_sync_peer.ss_family == AF_INET6) &&
3009 IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6*)
3010 &sc->sc_sync_peer)->sin6_addr))) {
3011 error = pfsync_multicast_setup(sc, sifp, imf, im6f);
3012 if (error) {
3013 if_rele(sifp);
3014 PFSYNC_UNLOCK(sc);
3015 #ifdef INET
3016 if (imf != NULL)
3017 ip_mfilter_free(imf);
3018 #endif
3019 #ifdef INET6
3020 if (im6f != NULL)
3021 ip6_mfilter_free(im6f);
3022 #endif
3023 return (error);
3024 }
3025 }
3026 if (sc->sc_sync_if)
3027 if_rele(sc->sc_sync_if);
3028 sc->sc_sync_if = sifp;
3029
3030 switch (sc->sc_sync_peer.ss_family) {
3031 #ifdef INET
3032 case AF_INET: {
3033 struct ip *ip;
3034 ip = &sc->sc_template.ipv4;
3035 bzero(ip, sizeof(*ip));
3036 ip->ip_v = IPVERSION;
3037 ip->ip_hl = sizeof(sc->sc_template.ipv4) >> 2;
3038 ip->ip_tos = IPTOS_LOWDELAY;
3039 /* len and id are set later. */
3040 ip->ip_off = htons(IP_DF);
3041 ip->ip_ttl = PFSYNC_DFLTTL;
3042 ip->ip_p = IPPROTO_PFSYNC;
3043 ip->ip_src.s_addr = INADDR_ANY;
3044 ip->ip_dst = ((struct sockaddr_in *)&sc->sc_sync_peer)->sin_addr;
3045 break;
3046 }
3047 #endif
3048 #ifdef INET6
3049 case AF_INET6: {
3050 struct ip6_hdr *ip6;
3051 ip6 = &sc->sc_template.ipv6;
3052 bzero(ip6, sizeof(*ip6));
3053 ip6->ip6_vfc = IPV6_VERSION;
3054 ip6->ip6_hlim = PFSYNC_DFLTTL;
3055 ip6->ip6_nxt = IPPROTO_PFSYNC;
3056 ip6->ip6_dst = ((struct sockaddr_in6 *)&sc->sc_sync_peer)->sin6_addr;
3057
3058 struct epoch_tracker et;
3059 NET_EPOCH_ENTER(et);
3060 in6_selectsrc_addr(if_getfib(sc->sc_sync_if), &ip6->ip6_dst, 0,
3061 sc->sc_sync_if, &ip6->ip6_src, NULL);
3062 NET_EPOCH_EXIT(et);
3063 break;
3064 }
3065 #endif
3066 }
3067
3068 /* Request a full state table update. */
3069 if ((sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p)
3070 (*carp_demote_adj_p)(V_pfsync_carp_adj,
3071 "pfsync bulk start");
3072 sc->sc_flags &= ~PFSYNCF_OK;
3073 if (V_pf_status.debug >= PF_DEBUG_MISC)
3074 printf("pfsync: requesting bulk update\n");
3075 PFSYNC_UNLOCK(sc);
3076 PFSYNC_BUCKET_LOCK(&sc->sc_buckets[0]);
3077 pfsync_request_update(0, 0);
3078 PFSYNC_BUCKET_UNLOCK(&sc->sc_buckets[0]);
3079 PFSYNC_BLOCK(sc);
3080 sc->sc_ureq_sent = time_uptime;
3081 callout_reset(&sc->sc_bulkfail_tmo, 5 * hz, pfsync_bulk_fail, sc);
3082 PFSYNC_BUNLOCK(sc);
3083 return (0);
3084 }
3085
3086 static void
pfsync_pointers_init(void)3087 pfsync_pointers_init(void)
3088 {
3089
3090 PF_RULES_WLOCK();
3091 V_pfsync_state_import_ptr = pfsync_state_import;
3092 V_pfsync_insert_state_ptr = pfsync_insert_state;
3093 V_pfsync_update_state_ptr = pfsync_update_state;
3094 V_pfsync_delete_state_ptr = pfsync_delete_state;
3095 V_pfsync_clear_states_ptr = pfsync_clear_states;
3096 V_pfsync_defer_ptr = pfsync_defer;
3097 PF_RULES_WUNLOCK();
3098 }
3099
3100 static void
pfsync_pointers_uninit(void)3101 pfsync_pointers_uninit(void)
3102 {
3103
3104 PF_RULES_WLOCK();
3105 V_pfsync_state_import_ptr = NULL;
3106 V_pfsync_insert_state_ptr = NULL;
3107 V_pfsync_update_state_ptr = NULL;
3108 V_pfsync_delete_state_ptr = NULL;
3109 V_pfsync_clear_states_ptr = NULL;
3110 V_pfsync_defer_ptr = NULL;
3111 PF_RULES_WUNLOCK();
3112 }
3113
3114 static void
vnet_pfsync_init(const void * unused __unused)3115 vnet_pfsync_init(const void *unused __unused)
3116 {
3117 int error;
3118
3119 V_pfsync_cloner = if_clone_simple(pfsyncname,
3120 pfsync_clone_create, pfsync_clone_destroy, 1);
3121 error = swi_add(&V_pfsync_swi_ie, pfsyncname, pfsyncintr, V_pfsyncif,
3122 SWI_NET, INTR_MPSAFE, &V_pfsync_swi_cookie);
3123 if (error) {
3124 if_clone_detach(V_pfsync_cloner);
3125 log(LOG_INFO, "swi_add() failed in %s\n", __func__);
3126 }
3127
3128 pfsync_pointers_init();
3129 }
3130 VNET_SYSINIT(vnet_pfsync_init, SI_SUB_PROTO_FIREWALL, SI_ORDER_ANY,
3131 vnet_pfsync_init, NULL);
3132
3133 static void
vnet_pfsync_uninit(const void * unused __unused)3134 vnet_pfsync_uninit(const void *unused __unused)
3135 {
3136 int ret __diagused;
3137
3138 pfsync_pointers_uninit();
3139
3140 if_clone_detach(V_pfsync_cloner);
3141 ret = swi_remove(V_pfsync_swi_cookie);
3142 MPASS(ret == 0);
3143 ret = intr_event_destroy(V_pfsync_swi_ie);
3144 MPASS(ret == 0);
3145 }
3146
3147 VNET_SYSUNINIT(vnet_pfsync_uninit, SI_SUB_PROTO_FIREWALL, SI_ORDER_FOURTH,
3148 vnet_pfsync_uninit, NULL);
3149
3150 static int
pfsync_init(void)3151 pfsync_init(void)
3152 {
3153 int error;
3154
3155 pfsync_detach_ifnet_ptr = pfsync_detach_ifnet;
3156
3157 #ifdef INET
3158 error = ipproto_register(IPPROTO_PFSYNC, pfsync_input, NULL);
3159 if (error)
3160 return (error);
3161 #endif
3162 #ifdef INET6
3163 error = ip6proto_register(IPPROTO_PFSYNC, pfsync6_input, NULL);
3164 if (error) {
3165 ipproto_unregister(IPPROTO_PFSYNC);
3166 return (error);
3167 }
3168 #endif
3169
3170 return (0);
3171 }
3172
3173 static void
pfsync_uninit(void)3174 pfsync_uninit(void)
3175 {
3176 pfsync_detach_ifnet_ptr = NULL;
3177
3178 #ifdef INET
3179 ipproto_unregister(IPPROTO_PFSYNC);
3180 #endif
3181 #ifdef INET6
3182 ip6proto_unregister(IPPROTO_PFSYNC);
3183 #endif
3184 }
3185
3186 static int
pfsync_modevent(module_t mod,int type,void * data)3187 pfsync_modevent(module_t mod, int type, void *data)
3188 {
3189 int error = 0;
3190
3191 switch (type) {
3192 case MOD_LOAD:
3193 error = pfsync_init();
3194 break;
3195 case MOD_UNLOAD:
3196 pfsync_uninit();
3197 break;
3198 default:
3199 error = EINVAL;
3200 break;
3201 }
3202
3203 return (error);
3204 }
3205
3206 static moduledata_t pfsync_mod = {
3207 pfsyncname,
3208 pfsync_modevent,
3209 0
3210 };
3211
3212 #define PFSYNC_MODVER 1
3213
3214 /* Stay on FIREWALL as we depend on pf being initialized and on inetdomain. */
3215 DECLARE_MODULE(pfsync, pfsync_mod, SI_SUB_PROTO_FIREWALL, SI_ORDER_ANY);
3216 MODULE_VERSION(pfsync, PFSYNC_MODVER);
3217 MODULE_DEPEND(pfsync, pf, PF_MODVER, PF_MODVER, PF_MODVER);
3218