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 pf_state_peer_export *,
127 struct pf_state_peer_export *);
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 pfsync_in_ins, /* PFSYNC_ACT_INS_1500 */
157 pfsync_in_upd, /* PFSYNC_ACT_UPD_1500 */
158 };
159
160 struct pfsync_q {
161 void (*write)(struct pf_kstate *, void *);
162 size_t len;
163 u_int8_t action;
164 };
165
166 /* We have the following sync queues */
167 enum pfsync_q_id {
168 PFSYNC_Q_INS_1301,
169 PFSYNC_Q_INS_1400,
170 PFSYNC_Q_INS_1500,
171 PFSYNC_Q_IACK,
172 PFSYNC_Q_UPD_1301,
173 PFSYNC_Q_UPD_1400,
174 PFSYNC_Q_UPD_1500,
175 PFSYNC_Q_UPD_C,
176 PFSYNC_Q_DEL_C,
177 PFSYNC_Q_COUNT,
178 };
179
180 /* Functions for building messages for given queue */
181 static void pfsync_out_state_1301(struct pf_kstate *, void *);
182 static void pfsync_out_state_1400(struct pf_kstate *, void *);
183 static void pfsync_out_state_1500(struct pf_kstate *, void *);
184 static void pfsync_out_iack(struct pf_kstate *, void *);
185 static void pfsync_out_upd_c(struct pf_kstate *, void *);
186 static void pfsync_out_del_c(struct pf_kstate *, void *);
187
188 /* Attach those functions to queue */
189 static struct pfsync_q pfsync_qs[] = {
190 { pfsync_out_state_1301, sizeof(struct pfsync_state_1301), PFSYNC_ACT_INS_1301 },
191 { pfsync_out_state_1400, sizeof(struct pfsync_state_1400), PFSYNC_ACT_INS_1400 },
192 { pfsync_out_state_1500, sizeof(struct pfsync_state_1500), PFSYNC_ACT_INS_1500 },
193 { pfsync_out_iack, sizeof(struct pfsync_ins_ack), PFSYNC_ACT_INS_ACK },
194 { pfsync_out_state_1301, sizeof(struct pfsync_state_1301), PFSYNC_ACT_UPD_1301 },
195 { pfsync_out_state_1400, sizeof(struct pfsync_state_1400), PFSYNC_ACT_UPD_1400 },
196 { pfsync_out_state_1500, sizeof(struct pfsync_state_1500), PFSYNC_ACT_UPD_1500 },
197 { pfsync_out_upd_c, sizeof(struct pfsync_upd_c), PFSYNC_ACT_UPD_C },
198 { pfsync_out_del_c, sizeof(struct pfsync_del_c), PFSYNC_ACT_DEL_C }
199 };
200
201 /* Map queue to pf_kstate->sync_state */
202 static u_int8_t pfsync_qid_sstate[] = {
203 PFSYNC_S_INS, /* PFSYNC_Q_INS_1301 */
204 PFSYNC_S_INS, /* PFSYNC_Q_INS_1400 */
205 PFSYNC_S_INS, /* PFSYNC_Q_INS_1500 */
206 PFSYNC_S_IACK, /* PFSYNC_Q_IACK */
207 PFSYNC_S_UPD, /* PFSYNC_Q_UPD_1301 */
208 PFSYNC_S_UPD, /* PFSYNC_Q_UPD_1400 */
209 PFSYNC_S_UPD, /* PFSYNC_Q_UPD_1500 */
210 PFSYNC_S_UPD_C, /* PFSYNC_Q_UPD_C */
211 PFSYNC_S_DEL_C, /* PFSYNC_Q_DEL_C */
212 };
213
214 /* Map pf_kstate->sync_state to queue */
215 static enum pfsync_q_id pfsync_sstate_to_qid(u_int8_t);
216
217 static void pfsync_q_ins(struct pf_kstate *, int sync_state, bool);
218 static void pfsync_q_del(struct pf_kstate *, bool, struct pfsync_bucket *);
219
220 static void pfsync_update_state(struct pf_kstate *);
221 static void pfsync_tx(struct pfsync_softc *, struct mbuf *);
222
223 struct pfsync_upd_req_item {
224 TAILQ_ENTRY(pfsync_upd_req_item) ur_entry;
225 struct pfsync_upd_req ur_msg;
226 };
227
228 struct pfsync_deferral {
229 struct pfsync_softc *pd_sc;
230 TAILQ_ENTRY(pfsync_deferral) pd_entry;
231 struct callout pd_tmo;
232
233 struct pf_kstate *pd_st;
234 struct mbuf *pd_m;
235 };
236
237 struct pfsync_bucket
238 {
239 int b_id;
240 struct pfsync_softc *b_sc;
241 struct mtx b_mtx;
242 struct callout b_tmo;
243 int b_flags;
244 #define PFSYNCF_BUCKET_PUSH 0x00000001
245
246 size_t b_len;
247 TAILQ_HEAD(, pf_kstate) b_qs[PFSYNC_Q_COUNT];
248 TAILQ_HEAD(, pfsync_upd_req_item) b_upd_req_list;
249 TAILQ_HEAD(, pfsync_deferral) b_deferrals;
250 u_int b_deferred;
251 uint8_t *b_plus;
252 size_t b_pluslen;
253
254 struct ifaltq b_snd;
255 };
256
257 struct pfsync_softc {
258 /* Configuration */
259 struct ifnet *sc_ifp;
260 struct ifnet *sc_sync_if;
261 struct ip_moptions sc_imo;
262 struct ip6_moptions sc_im6o;
263 struct sockaddr_storage sc_sync_peer;
264 uint32_t sc_flags;
265 uint8_t sc_maxupdates;
266 union inet_template sc_template;
267 struct mtx sc_mtx;
268 uint32_t sc_version;
269
270 /* Queued data */
271 struct pfsync_bucket *sc_buckets;
272
273 /* Bulk update info */
274 struct mtx sc_bulk_mtx;
275 uint32_t sc_ureq_sent;
276 int sc_bulk_tries;
277 uint32_t sc_ureq_received;
278 int sc_bulk_hashid;
279 uint64_t sc_bulk_stateid;
280 uint32_t sc_bulk_creatorid;
281 struct callout sc_bulk_tmo;
282 struct callout sc_bulkfail_tmo;
283 };
284
285 #define PFSYNC_LOCK(sc) mtx_lock(&(sc)->sc_mtx)
286 #define PFSYNC_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx)
287 #define PFSYNC_LOCK_ASSERT(sc) mtx_assert(&(sc)->sc_mtx, MA_OWNED)
288
289 #define PFSYNC_BUCKET_LOCK(b) mtx_lock(&(b)->b_mtx)
290 #define PFSYNC_BUCKET_UNLOCK(b) mtx_unlock(&(b)->b_mtx)
291 #define PFSYNC_BUCKET_LOCK_ASSERT(b) mtx_assert(&(b)->b_mtx, MA_OWNED)
292
293 #define PFSYNC_BLOCK(sc) mtx_lock(&(sc)->sc_bulk_mtx)
294 #define PFSYNC_BUNLOCK(sc) mtx_unlock(&(sc)->sc_bulk_mtx)
295 #define PFSYNC_BLOCK_ASSERT(sc) mtx_assert(&(sc)->sc_bulk_mtx, MA_OWNED)
296
297 #define PFSYNC_DEFER_TIMEOUT 20
298
299 static const char pfsyncname[] = "pfsync";
300 static MALLOC_DEFINE(M_PFSYNC, pfsyncname, "pfsync(4) data");
301 VNET_DEFINE_STATIC(struct pfsync_softc *, pfsyncif) = NULL;
302 #define V_pfsyncif VNET(pfsyncif)
303 VNET_DEFINE_STATIC(void *, pfsync_swi_cookie) = NULL;
304 #define V_pfsync_swi_cookie VNET(pfsync_swi_cookie)
305 VNET_DEFINE_STATIC(struct intr_event *, pfsync_swi_ie);
306 #define V_pfsync_swi_ie VNET(pfsync_swi_ie)
307 VNET_DEFINE_STATIC(struct pfsyncstats, pfsyncstats);
308 #define V_pfsyncstats VNET(pfsyncstats)
309 VNET_DEFINE_STATIC(int, pfsync_carp_adj) = CARP_MAXSKEW;
310 #define V_pfsync_carp_adj VNET(pfsync_carp_adj)
311 VNET_DEFINE_STATIC(unsigned int, pfsync_defer_timeout) = PFSYNC_DEFER_TIMEOUT;
312 #define V_pfsync_defer_timeout VNET(pfsync_defer_timeout)
313
314 static void pfsync_timeout(void *);
315 static void pfsync_push(struct pfsync_bucket *);
316 static void pfsync_push_all(struct pfsync_softc *);
317 static void pfsyncintr(void *);
318 static int pfsync_multicast_setup(struct pfsync_softc *, struct ifnet *,
319 struct in_mfilter *, struct in6_mfilter *);
320 static void pfsync_multicast_cleanup(struct pfsync_softc *);
321 static void pfsync_pointers_init(void);
322 static void pfsync_pointers_uninit(void);
323 static int pfsync_init(void);
324 static void pfsync_uninit(void);
325
326 static unsigned long pfsync_buckets;
327
328 SYSCTL_NODE(_net, OID_AUTO, pfsync, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
329 "PFSYNC");
330 SYSCTL_STRUCT(_net_pfsync, OID_AUTO, stats, CTLFLAG_VNET | CTLFLAG_RW,
331 &VNET_NAME(pfsyncstats), pfsyncstats,
332 "PFSYNC statistics (struct pfsyncstats, net/if_pfsync.h)");
333 SYSCTL_INT(_net_pfsync, OID_AUTO, carp_demotion_factor, CTLFLAG_VNET | CTLFLAG_RW,
334 &VNET_NAME(pfsync_carp_adj), 0, "pfsync's CARP demotion factor adjustment");
335 SYSCTL_ULONG(_net_pfsync, OID_AUTO, pfsync_buckets, CTLFLAG_RDTUN,
336 &pfsync_buckets, 0, "Number of pfsync hash buckets");
337 SYSCTL_UINT(_net_pfsync, OID_AUTO, defer_delay, CTLFLAG_VNET | CTLFLAG_RW,
338 &VNET_NAME(pfsync_defer_timeout), 0, "Deferred packet timeout (in ms)");
339
340 static int pfsync_clone_create(struct if_clone *, int, caddr_t);
341 static void pfsync_clone_destroy(struct ifnet *);
342 static int pfsync_alloc_scrub_memory(struct pf_state_peer_export *,
343 struct pf_state_peer *);
344 static int pfsyncoutput(struct ifnet *, struct mbuf *,
345 const struct sockaddr *, struct route *);
346 static int pfsyncioctl(struct ifnet *, u_long, caddr_t);
347
348 static int pfsync_defer(struct pf_kstate *, struct mbuf *);
349 static void pfsync_undefer(struct pfsync_deferral *, int);
350 static void pfsync_undefer_state_locked(struct pf_kstate *, int);
351 static void pfsync_undefer_state(struct pf_kstate *, int);
352 static void pfsync_defer_tmo(void *);
353
354 static void pfsync_request_update(u_int32_t, u_int64_t);
355 static bool pfsync_update_state_req(struct pf_kstate *);
356
357 static void pfsync_drop_all(struct pfsync_softc *);
358 static void pfsync_drop(struct pfsync_softc *, int);
359 static void pfsync_sendout(int, int);
360 static void pfsync_send_plus(void *, size_t);
361
362 static void pfsync_bulk_start(void);
363 static void pfsync_bulk_status(u_int8_t);
364 static void pfsync_bulk_update(void *);
365 static void pfsync_bulk_fail(void *);
366
367 static void pfsync_detach_ifnet(struct ifnet *);
368
369 static int pfsync_pfsyncreq_to_kstatus(struct pfsyncreq *,
370 struct pfsync_kstatus *);
371 static int pfsync_kstatus_to_softc(struct pfsync_kstatus *,
372 struct pfsync_softc *);
373
374 #ifdef IPSEC
375 static void pfsync_update_net_tdb(struct pfsync_tdb *);
376 #endif
377 static struct pfsync_bucket *pfsync_get_bucket(struct pfsync_softc *,
378 struct pf_kstate *);
379
380 #define PFSYNC_MAX_BULKTRIES 12
381
382 VNET_DEFINE(struct if_clone *, pfsync_cloner);
383 #define V_pfsync_cloner VNET(pfsync_cloner)
384
385 const struct in6_addr in6addr_linklocal_pfsync_group =
386 {{{ 0xff, 0x12, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
387 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0 }}};
388 static int
pfsync_clone_create(struct if_clone * ifc,int unit,caddr_t param)389 pfsync_clone_create(struct if_clone *ifc, int unit, caddr_t param)
390 {
391 struct pfsync_softc *sc;
392 struct ifnet *ifp;
393 struct pfsync_bucket *b;
394 int c;
395 enum pfsync_q_id q;
396
397 if (unit != 0)
398 return (EINVAL);
399
400 if (! pfsync_buckets)
401 pfsync_buckets = mp_ncpus * 2;
402
403 sc = malloc(sizeof(struct pfsync_softc), M_PFSYNC, M_WAITOK | M_ZERO);
404 sc->sc_flags |= PFSYNCF_OK;
405 sc->sc_maxupdates = 128;
406 sc->sc_version = PFSYNC_MSG_VERSION_DEFAULT;
407 sc->sc_buckets = mallocarray(pfsync_buckets, sizeof(*sc->sc_buckets),
408 M_PFSYNC, M_ZERO | M_WAITOK);
409 for (c = 0; c < pfsync_buckets; c++) {
410 b = &sc->sc_buckets[c];
411 mtx_init(&b->b_mtx, "pfsync bucket", NULL, MTX_DEF);
412
413 b->b_id = c;
414 b->b_sc = sc;
415 b->b_len = PFSYNC_MINPKT;
416
417 for (q = 0; q < PFSYNC_Q_COUNT; q++)
418 TAILQ_INIT(&b->b_qs[q]);
419
420 TAILQ_INIT(&b->b_upd_req_list);
421 TAILQ_INIT(&b->b_deferrals);
422
423 callout_init(&b->b_tmo, 1);
424
425 b->b_snd.ifq_maxlen = ifqmaxlen;
426 }
427
428 ifp = sc->sc_ifp = if_alloc(IFT_PFSYNC);
429 if_initname(ifp, pfsyncname, unit);
430 ifp->if_softc = sc;
431 ifp->if_ioctl = pfsyncioctl;
432 ifp->if_output = pfsyncoutput;
433 ifp->if_hdrlen = sizeof(struct pfsync_header);
434 ifp->if_mtu = ETHERMTU;
435 mtx_init(&sc->sc_mtx, pfsyncname, NULL, MTX_DEF);
436 mtx_init(&sc->sc_bulk_mtx, "pfsync bulk", NULL, MTX_DEF);
437 callout_init_mtx(&sc->sc_bulk_tmo, &sc->sc_bulk_mtx, 0);
438 callout_init_mtx(&sc->sc_bulkfail_tmo, &sc->sc_bulk_mtx, 0);
439
440 if_attach(ifp);
441
442 bpfattach(ifp, DLT_PFSYNC, PFSYNC_HDRLEN);
443
444 V_pfsyncif = sc;
445
446 return (0);
447 }
448
449 static void
pfsync_clone_destroy(struct ifnet * ifp)450 pfsync_clone_destroy(struct ifnet *ifp)
451 {
452 struct pfsync_softc *sc = ifp->if_softc;
453 struct pfsync_bucket *b;
454 int c, ret;
455
456 for (c = 0; c < pfsync_buckets; c++) {
457 b = &sc->sc_buckets[c];
458 /*
459 * At this stage, everything should have already been
460 * cleared by pfsync_uninit(), and we have only to
461 * drain callouts.
462 */
463 PFSYNC_BUCKET_LOCK(b);
464 while (b->b_deferred > 0) {
465 struct pfsync_deferral *pd =
466 TAILQ_FIRST(&b->b_deferrals);
467
468 ret = callout_stop(&pd->pd_tmo);
469 if (ret > 0) {
470 pfsync_undefer(pd, 1);
471 } else {
472 PFSYNC_BUCKET_UNLOCK(b);
473 callout_drain(&pd->pd_tmo);
474 PFSYNC_BUCKET_LOCK(b);
475 }
476 }
477 MPASS(b->b_deferred == 0);
478 MPASS(TAILQ_EMPTY(&b->b_deferrals));
479 PFSYNC_BUCKET_UNLOCK(b);
480
481 free(b->b_plus, M_PFSYNC);
482 b->b_plus = NULL;
483 b->b_pluslen = 0;
484
485 callout_drain(&b->b_tmo);
486 }
487
488 callout_drain(&sc->sc_bulkfail_tmo);
489 callout_drain(&sc->sc_bulk_tmo);
490
491 if (!(sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p)
492 (*carp_demote_adj_p)(-V_pfsync_carp_adj, "pfsync destroy");
493 bpfdetach(ifp);
494 if_detach(ifp);
495
496 pfsync_drop_all(sc);
497
498 if_free(ifp);
499 pfsync_multicast_cleanup(sc);
500 mtx_destroy(&sc->sc_mtx);
501 mtx_destroy(&sc->sc_bulk_mtx);
502
503 for (c = 0; c < pfsync_buckets; c++) {
504 b = &sc->sc_buckets[c];
505 mtx_destroy(&b->b_mtx);
506 }
507 free(sc->sc_buckets, M_PFSYNC);
508 free(sc, M_PFSYNC);
509
510 V_pfsyncif = NULL;
511 }
512
513 static int
pfsync_alloc_scrub_memory(struct pf_state_peer_export * s,struct pf_state_peer * d)514 pfsync_alloc_scrub_memory(struct pf_state_peer_export *s,
515 struct pf_state_peer *d)
516 {
517 if (s->scrub.scrub_flag && d->scrub == NULL) {
518 d->scrub = uma_zalloc(V_pf_state_scrub_z, M_NOWAIT | M_ZERO);
519 if (d->scrub == NULL)
520 return (ENOMEM);
521 }
522
523 return (0);
524 }
525
526 static int
pfsync_state_import(union pfsync_state_union * sp,int flags,int msg_version)527 pfsync_state_import(union pfsync_state_union *sp, int flags, int msg_version)
528 {
529 struct pfsync_softc *sc = V_pfsyncif;
530 #ifndef __NO_STRICT_ALIGNMENT
531 struct pfsync_state_key key[2];
532 #endif
533 struct pfsync_state_key *kw, *ks;
534 struct pf_kstate *st = NULL;
535 struct pf_state_key *skw = NULL, *sks = NULL;
536 struct pf_krule *r = NULL;
537 struct pfi_kkif *kif, *orig_kif;
538 struct pfi_kkif *rt_kif = NULL;
539 struct pf_kpooladdr *rpool_first;
540 int error;
541 int n = 0;
542 sa_family_t rt_af = 0;
543 uint8_t rt = 0;
544 sa_family_t wire_af, stack_af;
545 u_int8_t wire_proto, stack_proto;
546
547 PF_RULES_RASSERT();
548
549 if (strnlen(sp->pfs_1301.ifname, IFNAMSIZ) == IFNAMSIZ)
550 return (EINVAL);
551
552 if (sp->pfs_1301.creatorid == 0) {
553 if (V_pf_status.debug >= PF_DEBUG_MISC)
554 printf("%s: invalid creator id: %08x\n", __func__,
555 ntohl(sp->pfs_1301.creatorid));
556 return (EINVAL);
557 }
558
559 /*
560 * Check interfaces early on. Do it before allocating memory etc.
561 * Because there is a high chance there will be a lot more such states.
562 */
563 if ((kif = orig_kif = pfi_kkif_find(sp->pfs_1301.ifname)) == NULL) {
564 if (V_pf_status.debug >= PF_DEBUG_MISC)
565 printf("%s: unknown interface: %s\n", __func__,
566 sp->pfs_1301.ifname);
567 if (flags & PFSYNC_SI_IOCTL)
568 return (EINVAL);
569 return (0); /* skip this state */
570 }
571
572 /*
573 * States created with floating interface policy can be synchronized to
574 * hosts with different interfaces, because they are bound to V_pfi_all.
575 * But s->orig_kif still points to a real interface. Don't abort
576 * importing the state if orig_kif does not exists on the importing host
577 * but the state is not interface-bound.
578 */
579 if (msg_version == PFSYNC_MSG_VERSION_1500) {
580 orig_kif = pfi_kkif_find(sp->pfs_1500.orig_ifname);
581 if (orig_kif == NULL) {
582 if (kif == V_pfi_all) {
583 orig_kif = kif;
584 } else {
585 if (V_pf_status.debug >= PF_DEBUG_MISC)
586 printf("%s: unknown original interface:"
587 " %s\n", __func__,
588 sp->pfs_1500.orig_ifname);
589 if (flags & PFSYNC_SI_IOCTL)
590 return (EINVAL);
591 return (0); /* skip this state */
592 }
593 }
594 }
595
596 /*
597 * If the ruleset checksums match or the state is coming from the ioctl,
598 * it's safe to associate the state with the rule of that number.
599 */
600 if (sp->pfs_1301.rule != htonl(-1) && sp->pfs_1301.anchor == htonl(-1) &&
601 (flags & (PFSYNC_SI_IOCTL | PFSYNC_SI_CKSUM)) && ntohl(sp->pfs_1301.rule) <
602 pf_main_ruleset.rules[PF_RULESET_FILTER].active.rcount) {
603 TAILQ_FOREACH(r, pf_main_ruleset.rules[
604 PF_RULESET_FILTER].active.ptr, entries)
605 if (ntohl(sp->pfs_1301.rule) == n++)
606 break;
607 } else
608 r = &V_pf_default_rule;
609
610 switch (msg_version) {
611 case PFSYNC_MSG_VERSION_1301:
612 /*
613 * On FreeBSD <= 13 the routing interface and routing operation
614 * are not sent over pfsync. If the ruleset is identical,
615 * though, we might be able to recover the routing information
616 * from the local ruleset.
617 */
618 if (r != &V_pf_default_rule) {
619 struct pf_kpool *pool = &r->route;
620
621 /* Backwards compatibility. */
622 if (TAILQ_EMPTY(&pool->list))
623 pool = &r->rdr;
624
625 /*
626 * The ruleset is identical, try to recover. If the rule
627 * has a redirection pool with a single interface, there
628 * is a chance that this interface is identical as on
629 * the pfsync peer. If there's more than one interface,
630 * give up, as we can't be sure that we will pick the
631 * same one as the pfsync peer did.
632 */
633 rpool_first = TAILQ_FIRST(&(pool->list));
634 if ((rpool_first == NULL) ||
635 (TAILQ_NEXT(rpool_first, entries) != NULL)) {
636 DPFPRINTF(PF_DEBUG_MISC,
637 "%s: can't recover routing information "
638 "because of empty or bad redirection pool",
639 __func__);
640 return ((flags & PFSYNC_SI_IOCTL) ? EINVAL : 0);
641 }
642 rt = r->rt;
643 rt_kif = rpool_first->kif;
644 /*
645 * Guess the AF of the route address, FreeBSD 13 does
646 * not support af-to nor prefer-ipv6-nexthop
647 * so it should be safe.
648 */
649 rt_af = r->af;
650 } else if (!PF_AZERO(&sp->pfs_1301.rt_addr, sp->pfs_1301.af)) {
651 /*
652 * Ruleset different, routing *supposedly* requested,
653 * give up on recovering.
654 */
655 DPFPRINTF(PF_DEBUG_MISC,
656 "%s: can't recover routing information "
657 "because of different ruleset", __func__);
658 return ((flags & PFSYNC_SI_IOCTL) ? EINVAL : 0);
659 }
660 wire_af = stack_af = sp->pfs_1301.af;
661 wire_proto = stack_proto = sp->pfs_1301.proto;
662 break;
663 case PFSYNC_MSG_VERSION_1400:
664 /*
665 * On FreeBSD 14 we're not taking any chances.
666 * We use the information synced to us.
667 */
668 if (sp->pfs_1400.rt) {
669 rt_kif = pfi_kkif_find(sp->pfs_1400.rt_ifname);
670 if (rt_kif == NULL) {
671 DPFPRINTF(PF_DEBUG_MISC,
672 "%s: unknown route interface: %s",
673 __func__, sp->pfs_1400.rt_ifname);
674 return ((flags & PFSYNC_SI_IOCTL) ? EINVAL : 0);
675 }
676 rt = sp->pfs_1400.rt;
677 /*
678 * Guess the AF of the route address, FreeBSD 14 does
679 * not support af-to nor prefer-ipv6-nexthop
680 * so it should be safe.
681 */
682 rt_af = sp->pfs_1400.af;
683 }
684 wire_af = stack_af = sp->pfs_1400.af;
685 wire_proto = stack_proto = sp->pfs_1400.proto;
686 break;
687 case PFSYNC_MSG_VERSION_1500:
688 /*
689 * On FreeBSD 15 and above we're not taking any chances.
690 * We use the information synced to us.
691 */
692 if (sp->pfs_1500.rt) {
693 rt_kif = pfi_kkif_find(sp->pfs_1500.rt_ifname);
694 if (rt_kif == NULL) {
695 DPFPRINTF(PF_DEBUG_MISC,
696 "%s: unknown route interface: %s",
697 __func__, sp->pfs_1500.rt_ifname);
698 return ((flags & PFSYNC_SI_IOCTL) ? EINVAL : 0);
699 }
700 rt = sp->pfs_1500.rt;
701 rt_af = sp->pfs_1500.rt_af;
702 }
703 wire_af = sp->pfs_1500.wire_af;
704 stack_af = sp->pfs_1500.stack_af;
705 wire_proto = sp->pfs_1500.wire_proto;
706 stack_proto = sp->pfs_1500.stack_proto;
707 break;
708 }
709
710 if ((r->max_states &&
711 counter_u64_fetch(r->states_cur) >= r->max_states))
712 goto cleanup;
713
714 /*
715 * XXXGL: consider M_WAITOK in ioctl path after.
716 */
717 st = pf_alloc_state(M_NOWAIT);
718 if (__predict_false(st == NULL))
719 goto cleanup;
720
721 if ((skw = uma_zalloc(V_pf_state_key_z, M_NOWAIT)) == NULL)
722 goto cleanup;
723
724 #ifndef __NO_STRICT_ALIGNMENT
725 bcopy(&sp->pfs_1301.key, key, sizeof(struct pfsync_state_key) * 2);
726 kw = &key[PF_SK_WIRE];
727 ks = &key[PF_SK_STACK];
728 #else
729 kw = &sp->pfs_1301.key[PF_SK_WIRE];
730 ks = &sp->pfs_1301.key[PF_SK_STACK];
731 #endif
732
733 if (wire_af != stack_af ||
734 PF_ANEQ(&kw->addr[0], &ks->addr[0], wire_af) ||
735 PF_ANEQ(&kw->addr[1], &ks->addr[1], wire_af) ||
736 kw->port[0] != ks->port[0] ||
737 kw->port[1] != ks->port[1]) {
738 sks = uma_zalloc(V_pf_state_key_z, M_NOWAIT);
739 if (sks == NULL)
740 goto cleanup;
741 } else
742 sks = skw;
743
744 /* allocate memory for scrub info */
745 if (pfsync_alloc_scrub_memory(&sp->pfs_1301.src, &st->src) ||
746 pfsync_alloc_scrub_memory(&sp->pfs_1301.dst, &st->dst))
747 goto cleanup;
748
749 /* Copy to state key(s). */
750 skw->addr[0] = kw->addr[0];
751 skw->addr[1] = kw->addr[1];
752 skw->port[0] = kw->port[0];
753 skw->port[1] = kw->port[1];
754 skw->proto = wire_proto;
755 skw->af = wire_af;
756 if (sks != skw) {
757 sks->addr[0] = ks->addr[0];
758 sks->addr[1] = ks->addr[1];
759 sks->port[0] = ks->port[0];
760 sks->port[1] = ks->port[1];
761 sks->proto = stack_proto;
762 sks->af = stack_af;
763 }
764
765 /* copy to state */
766 st->creation = (time_uptime - ntohl(sp->pfs_1301.creation)) * 1000;
767 st->act.rt = rt;
768 st->act.rt_kif = rt_kif;
769 st->act.rt_af = rt_af;
770
771 switch (msg_version) {
772 case PFSYNC_MSG_VERSION_1301:
773 st->state_flags = sp->pfs_1301.state_flags;
774 st->direction = sp->pfs_1301.direction;
775 st->act.log = sp->pfs_1301.log;
776 st->timeout = sp->pfs_1301.timeout;
777 if (rt)
778 bcopy(&sp->pfs_1301.rt_addr, &st->act.rt_addr,
779 sizeof(st->act.rt_addr));
780 /*
781 * In FreeBSD 13 pfsync lacks many attributes. Copy them
782 * from the rule if possible. If rule can't be matched
783 * clear any set options as we can't recover their
784 * parameters.
785 */
786 if (r == &V_pf_default_rule) {
787 st->state_flags &= ~PFSTATE_SETMASK;
788 } else {
789 /*
790 * Similar to pf_rule_to_actions(). This code
791 * won't set the actions properly if they come
792 * from multiple "match" rules as only rule
793 * creating the state is send over pfsync.
794 */
795 st->act.qid = r->qid;
796 st->act.pqid = r->pqid;
797 st->act.rtableid = r->rtableid;
798 if (r->scrub_flags & PFSTATE_SETTOS)
799 st->act.set_tos = r->set_tos;
800 st->act.min_ttl = r->min_ttl;
801 st->act.max_mss = r->max_mss;
802 st->state_flags |= (r->scrub_flags &
803 (PFSTATE_NODF|PFSTATE_RANDOMID|
804 PFSTATE_SETTOS|PFSTATE_SCRUB_TCP|
805 PFSTATE_SETPRIO));
806 if (r->dnpipe || r->dnrpipe) {
807 if (r->free_flags & PFRULE_DN_IS_PIPE)
808 st->state_flags |= PFSTATE_DN_IS_PIPE;
809 else
810 st->state_flags &= ~PFSTATE_DN_IS_PIPE;
811 }
812 st->act.dnpipe = r->dnpipe;
813 st->act.dnrpipe = r->dnrpipe;
814 }
815 break;
816 case PFSYNC_MSG_VERSION_1400:
817 st->state_flags = ntohs(sp->pfs_1400.state_flags);
818 st->direction = sp->pfs_1400.direction;
819 st->act.log = sp->pfs_1400.log;
820 st->timeout = sp->pfs_1400.timeout;
821 st->act.qid = ntohs(sp->pfs_1400.qid);
822 st->act.pqid = ntohs(sp->pfs_1400.pqid);
823 st->act.dnpipe = ntohs(sp->pfs_1400.dnpipe);
824 st->act.dnrpipe = ntohs(sp->pfs_1400.dnrpipe);
825 st->act.rtableid = ntohl(sp->pfs_1400.rtableid);
826 st->act.min_ttl = sp->pfs_1400.min_ttl;
827 st->act.set_tos = sp->pfs_1400.set_tos;
828 st->act.max_mss = ntohs(sp->pfs_1400.max_mss);
829 st->act.set_prio[0] = sp->pfs_1400.set_prio[0];
830 st->act.set_prio[1] = sp->pfs_1400.set_prio[1];
831 if (rt)
832 bcopy(&sp->pfs_1400.rt_addr, &st->act.rt_addr,
833 sizeof(st->act.rt_addr));
834 break;
835 case PFSYNC_MSG_VERSION_1500:
836 st->state_flags = ntohs(sp->pfs_1500.state_flags);
837 st->direction = sp->pfs_1500.direction;
838 st->act.log = sp->pfs_1500.log;
839 st->timeout = sp->pfs_1500.timeout;
840 st->act.qid = ntohs(sp->pfs_1500.qid);
841 st->act.pqid = ntohs(sp->pfs_1500.pqid);
842 st->act.dnpipe = ntohs(sp->pfs_1500.dnpipe);
843 st->act.dnrpipe = ntohs(sp->pfs_1500.dnrpipe);
844 st->act.rtableid = ntohl(sp->pfs_1500.rtableid);
845 st->act.min_ttl = sp->pfs_1500.min_ttl;
846 st->act.set_tos = sp->pfs_1500.set_tos;
847 st->act.max_mss = ntohs(sp->pfs_1500.max_mss);
848 st->act.set_prio[0] = sp->pfs_1500.set_prio[0];
849 st->act.set_prio[1] = sp->pfs_1500.set_prio[1];
850 if (rt)
851 bcopy(&sp->pfs_1500.rt_addr, &st->act.rt_addr,
852 sizeof(st->act.rt_addr));
853 if (sp->pfs_1500.tagname[0] != 0)
854 st->tag = pf_tagname2tag(sp->pfs_1500.tagname);
855 break;
856 default:
857 panic("%s: Unsupported pfsync_msg_version %d",
858 __func__, msg_version);
859 }
860
861 st->expire = pf_get_uptime();
862 if (sp->pfs_1301.expire) {
863 uint32_t timeout;
864 timeout = r->timeout[st->timeout];
865 if (!timeout)
866 timeout = V_pf_default_rule.timeout[st->timeout];
867
868 /* sp->expire may have been adaptively scaled by export. */
869 st->expire -= (timeout - ntohl(sp->pfs_1301.expire)) * 1000;
870 }
871
872 if (! (st->act.rtableid == -1 ||
873 (st->act.rtableid >= 0 && st->act.rtableid < rt_numfibs)))
874 goto cleanup;
875
876 st->id = sp->pfs_1301.id;
877 st->creatorid = sp->pfs_1301.creatorid;
878 pf_state_peer_ntoh(&sp->pfs_1301.src, &st->src);
879 pf_state_peer_ntoh(&sp->pfs_1301.dst, &st->dst);
880
881 st->rule = r;
882 st->nat_rule = NULL;
883 st->anchor = NULL;
884
885 st->pfsync_time = time_uptime;
886 st->sync_state = PFSYNC_S_NONE;
887
888 if (!(flags & PFSYNC_SI_IOCTL))
889 st->state_flags |= PFSTATE_NOSYNC;
890
891 if ((error = pf_state_insert(kif, orig_kif, skw, sks, st)) != 0)
892 goto cleanup_state;
893
894 /* XXX when we have nat_rule/anchors, use STATE_INC_COUNTERS */
895 counter_u64_add(r->states_cur, 1);
896 counter_u64_add(r->states_tot, 1);
897
898 if (!(flags & PFSYNC_SI_IOCTL)) {
899 st->state_flags &= ~PFSTATE_NOSYNC;
900 if (st->state_flags & PFSTATE_ACK) {
901 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
902 PFSYNC_BUCKET_LOCK(b);
903 pfsync_q_ins(st, PFSYNC_S_IACK, true);
904 PFSYNC_BUCKET_UNLOCK(b);
905
906 pfsync_push_all(sc);
907 }
908 }
909 st->state_flags &= ~PFSTATE_ACK;
910 PF_STATE_UNLOCK(st);
911
912 return (0);
913
914 cleanup:
915 error = ENOMEM;
916
917 if (skw == sks)
918 sks = NULL;
919 uma_zfree(V_pf_state_key_z, skw);
920 uma_zfree(V_pf_state_key_z, sks);
921
922 cleanup_state: /* pf_state_insert() frees the state keys. */
923 if (st) {
924 st->timeout = PFTM_UNLINKED; /* appease an assert */
925 pf_free_state(st);
926 }
927 return (error);
928 }
929
930 #ifdef INET
931 static int
pfsync_input(struct mbuf ** mp,int * offp __unused,int proto __unused)932 pfsync_input(struct mbuf **mp, int *offp __unused, int proto __unused)
933 {
934 struct pfsync_softc *sc = V_pfsyncif;
935 struct mbuf *m = *mp;
936 struct ip *ip = mtod(m, struct ip *);
937 struct pfsync_header *ph;
938 struct pfsync_subheader subh;
939
940 int offset, len, flags = 0;
941 int rv;
942 uint16_t count;
943
944 PF_RULES_RLOCK_TRACKER;
945
946 *mp = NULL;
947 V_pfsyncstats.pfsyncs_ipackets++;
948
949 /* Verify that we have a sync interface configured. */
950 if (!sc || !sc->sc_sync_if || !V_pf_status.running ||
951 (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
952 goto done;
953
954 /* verify that the packet came in on the right interface */
955 if (sc->sc_sync_if != m->m_pkthdr.rcvif) {
956 V_pfsyncstats.pfsyncs_badif++;
957 goto done;
958 }
959
960 if_inc_counter(sc->sc_ifp, IFCOUNTER_IPACKETS, 1);
961 if_inc_counter(sc->sc_ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
962 /* verify that the IP TTL is 255. */
963 if (ip->ip_ttl != PFSYNC_DFLTTL) {
964 V_pfsyncstats.pfsyncs_badttl++;
965 goto done;
966 }
967
968 offset = ip->ip_hl << 2;
969 if (m->m_pkthdr.len < offset + sizeof(*ph)) {
970 V_pfsyncstats.pfsyncs_hdrops++;
971 goto done;
972 }
973
974 if (offset + sizeof(*ph) > m->m_len) {
975 if (m_pullup(m, offset + sizeof(*ph)) == NULL) {
976 V_pfsyncstats.pfsyncs_hdrops++;
977 return (IPPROTO_DONE);
978 }
979 ip = mtod(m, struct ip *);
980 }
981 ph = (struct pfsync_header *)((char *)ip + offset);
982
983 /* verify the version */
984 if (ph->version != PFSYNC_VERSION) {
985 V_pfsyncstats.pfsyncs_badver++;
986 goto done;
987 }
988
989 len = ntohs(ph->len) + offset;
990 if (m->m_pkthdr.len < len) {
991 V_pfsyncstats.pfsyncs_badlen++;
992 goto done;
993 }
994
995 /*
996 * Trusting pf_chksum during packet processing, as well as seeking
997 * in interface name tree, require holding PF_RULES_RLOCK().
998 */
999 PF_RULES_RLOCK();
1000 if (!bcmp(&ph->pfcksum, &V_pf_status.pf_chksum, PF_MD5_DIGEST_LENGTH))
1001 flags = PFSYNC_SI_CKSUM;
1002
1003 offset += sizeof(*ph);
1004 while (offset <= len - sizeof(subh)) {
1005 m_copydata(m, offset, sizeof(subh), (caddr_t)&subh);
1006 offset += sizeof(subh);
1007
1008 if (subh.action >= PFSYNC_ACT_MAX) {
1009 V_pfsyncstats.pfsyncs_badact++;
1010 PF_RULES_RUNLOCK();
1011 goto done;
1012 }
1013
1014 count = ntohs(subh.count);
1015 V_pfsyncstats.pfsyncs_iacts[subh.action] += count;
1016 rv = (*pfsync_acts[subh.action])(m, offset, count, flags, subh.action);
1017 if (rv == -1) {
1018 PF_RULES_RUNLOCK();
1019 return (IPPROTO_DONE);
1020 }
1021
1022 offset += rv;
1023 }
1024 PF_RULES_RUNLOCK();
1025
1026 done:
1027 m_freem(m);
1028 return (IPPROTO_DONE);
1029 }
1030 #endif
1031
1032 #ifdef INET6
1033 static int
pfsync6_input(struct mbuf ** mp,int * offp __unused,int proto __unused)1034 pfsync6_input(struct mbuf **mp, int *offp __unused, int proto __unused)
1035 {
1036 struct pfsync_softc *sc = V_pfsyncif;
1037 struct mbuf *m = *mp;
1038 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1039 struct pfsync_header *ph;
1040 struct pfsync_subheader subh;
1041
1042 int offset, len, flags = 0;
1043 int rv;
1044 uint16_t count;
1045
1046 PF_RULES_RLOCK_TRACKER;
1047
1048 *mp = NULL;
1049 V_pfsyncstats.pfsyncs_ipackets++;
1050
1051 /* Verify that we have a sync interface configured. */
1052 if (!sc || !sc->sc_sync_if || !V_pf_status.running ||
1053 (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
1054 goto done;
1055
1056 /* verify that the packet came in on the right interface */
1057 if (sc->sc_sync_if != m->m_pkthdr.rcvif) {
1058 V_pfsyncstats.pfsyncs_badif++;
1059 goto done;
1060 }
1061
1062 if_inc_counter(sc->sc_ifp, IFCOUNTER_IPACKETS, 1);
1063 if_inc_counter(sc->sc_ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
1064 /* verify that the IP TTL is 255. */
1065 if (ip6->ip6_hlim != PFSYNC_DFLTTL) {
1066 V_pfsyncstats.pfsyncs_badttl++;
1067 goto done;
1068 }
1069
1070
1071 offset = sizeof(*ip6);
1072 if (m->m_pkthdr.len < offset + sizeof(*ph)) {
1073 V_pfsyncstats.pfsyncs_hdrops++;
1074 goto done;
1075 }
1076
1077 if (offset + sizeof(*ph) > m->m_len) {
1078 if (m_pullup(m, offset + sizeof(*ph)) == NULL) {
1079 V_pfsyncstats.pfsyncs_hdrops++;
1080 return (IPPROTO_DONE);
1081 }
1082 ip6 = mtod(m, struct ip6_hdr *);
1083 }
1084 ph = (struct pfsync_header *)((char *)ip6 + offset);
1085
1086 /* verify the version */
1087 if (ph->version != PFSYNC_VERSION) {
1088 V_pfsyncstats.pfsyncs_badver++;
1089 goto done;
1090 }
1091
1092 len = ntohs(ph->len) + offset;
1093 if (m->m_pkthdr.len < len) {
1094 V_pfsyncstats.pfsyncs_badlen++;
1095 goto done;
1096 }
1097
1098 /*
1099 * Trusting pf_chksum during packet processing, as well as seeking
1100 * in interface name tree, require holding PF_RULES_RLOCK().
1101 */
1102 PF_RULES_RLOCK();
1103 if (!bcmp(&ph->pfcksum, &V_pf_status.pf_chksum, PF_MD5_DIGEST_LENGTH))
1104 flags = PFSYNC_SI_CKSUM;
1105
1106 offset += sizeof(*ph);
1107 while (offset <= len - sizeof(subh)) {
1108 m_copydata(m, offset, sizeof(subh), (caddr_t)&subh);
1109 offset += sizeof(subh);
1110
1111 if (subh.action >= PFSYNC_ACT_MAX) {
1112 V_pfsyncstats.pfsyncs_badact++;
1113 PF_RULES_RUNLOCK();
1114 goto done;
1115 }
1116
1117 count = ntohs(subh.count);
1118 V_pfsyncstats.pfsyncs_iacts[subh.action] += count;
1119 rv = (*pfsync_acts[subh.action])(m, offset, count, flags, subh.action);
1120 if (rv == -1) {
1121 PF_RULES_RUNLOCK();
1122 return (IPPROTO_DONE);
1123 }
1124
1125 offset += rv;
1126 }
1127 PF_RULES_RUNLOCK();
1128
1129 done:
1130 m_freem(m);
1131 return (IPPROTO_DONE);
1132 }
1133 #endif
1134
1135 static int
pfsync_in_clr(struct mbuf * m,int offset,int count,int flags,int action)1136 pfsync_in_clr(struct mbuf *m, int offset, int count, int flags, int action)
1137 {
1138 struct pfsync_clr *clr;
1139 struct mbuf *mp;
1140 int len = sizeof(*clr) * count;
1141 int i, offp;
1142 u_int32_t creatorid;
1143
1144 mp = m_pulldown(m, offset, len, &offp);
1145 if (mp == NULL) {
1146 V_pfsyncstats.pfsyncs_badlen++;
1147 return (-1);
1148 }
1149 clr = (struct pfsync_clr *)(mp->m_data + offp);
1150
1151 for (i = 0; i < count; i++) {
1152 creatorid = clr[i].creatorid;
1153
1154 if (clr[i].ifname[0] != '\0' &&
1155 pfi_kkif_find(clr[i].ifname) == NULL)
1156 continue;
1157
1158 for (int i = 0; i <= V_pf_hashmask; i++) {
1159 struct pf_idhash *ih = &V_pf_idhash[i];
1160 struct pf_kstate *s;
1161 relock:
1162 PF_HASHROW_LOCK(ih);
1163 LIST_FOREACH(s, &ih->states, entry) {
1164 if (s->creatorid == creatorid) {
1165 s->state_flags |= PFSTATE_NOSYNC;
1166 pf_remove_state(s);
1167 goto relock;
1168 }
1169 }
1170 PF_HASHROW_UNLOCK(ih);
1171 }
1172 }
1173
1174 return (len);
1175 }
1176
1177 static int
pfsync_in_ins(struct mbuf * m,int offset,int count,int flags,int action)1178 pfsync_in_ins(struct mbuf *m, int offset, int count, int flags, int action)
1179 {
1180 struct mbuf *mp;
1181 union pfsync_state_union *sa, *sp;
1182 int i, offp, total_len, msg_version, msg_len;
1183 u_int8_t timeout, direction;
1184 sa_family_t af;
1185
1186 switch (action) {
1187 case PFSYNC_ACT_INS_1301:
1188 msg_len = sizeof(struct pfsync_state_1301);
1189 msg_version = PFSYNC_MSG_VERSION_1301;
1190 break;
1191 case PFSYNC_ACT_INS_1400:
1192 msg_len = sizeof(struct pfsync_state_1400);
1193 msg_version = PFSYNC_MSG_VERSION_1400;
1194 break;
1195 case PFSYNC_ACT_INS_1500:
1196 msg_len = sizeof(struct pfsync_state_1500);
1197 msg_version = PFSYNC_MSG_VERSION_1500;
1198 break;
1199 default:
1200 V_pfsyncstats.pfsyncs_badver++;
1201 return (-1);
1202 }
1203
1204 total_len = msg_len * count;
1205
1206 mp = m_pulldown(m, offset, total_len, &offp);
1207 if (mp == NULL) {
1208 V_pfsyncstats.pfsyncs_badlen++;
1209 return (-1);
1210 }
1211 sa = (union pfsync_state_union *)(mp->m_data + offp);
1212
1213 for (i = 0; i < count; i++) {
1214 sp = (union pfsync_state_union *)((char *)sa + msg_len * i);
1215
1216 switch (msg_version) {
1217 case PFSYNC_MSG_VERSION_1301:
1218 case PFSYNC_MSG_VERSION_1400:
1219 af = sp->pfs_1301.af;
1220 timeout = sp->pfs_1301.timeout;
1221 direction = sp->pfs_1301.direction;
1222 break;
1223 case PFSYNC_MSG_VERSION_1500:
1224 af = sp->pfs_1500.wire_af;
1225 timeout = sp->pfs_1500.timeout;
1226 direction = sp->pfs_1500.direction;
1227 break;
1228 }
1229
1230 /* Check for invalid values. */
1231 if (timeout >= PFTM_MAX ||
1232 sp->pfs_1301.src.state > PF_TCPS_PROXY_DST ||
1233 sp->pfs_1301.dst.state > PF_TCPS_PROXY_DST ||
1234 direction > PF_OUT ||
1235 (af != AF_INET && af != AF_INET6)) {
1236 if (V_pf_status.debug >= PF_DEBUG_MISC)
1237 printf("%s: invalid value\n", __func__);
1238 V_pfsyncstats.pfsyncs_badval++;
1239 continue;
1240 }
1241
1242 if (pfsync_state_import(sp, flags, msg_version) != 0)
1243 V_pfsyncstats.pfsyncs_badact++;
1244 }
1245
1246 return (total_len);
1247 }
1248
1249 static int
pfsync_in_iack(struct mbuf * m,int offset,int count,int flags,int action)1250 pfsync_in_iack(struct mbuf *m, int offset, int count, int flags, int action)
1251 {
1252 struct pfsync_ins_ack *ia, *iaa;
1253 struct pf_kstate *st;
1254
1255 struct mbuf *mp;
1256 int len = count * sizeof(*ia);
1257 int offp, i;
1258
1259 mp = m_pulldown(m, offset, len, &offp);
1260 if (mp == NULL) {
1261 V_pfsyncstats.pfsyncs_badlen++;
1262 return (-1);
1263 }
1264 iaa = (struct pfsync_ins_ack *)(mp->m_data + offp);
1265
1266 for (i = 0; i < count; i++) {
1267 ia = &iaa[i];
1268
1269 st = pf_find_state_byid(ia->id, ia->creatorid);
1270 if (st == NULL)
1271 continue;
1272
1273 if (st->state_flags & PFSTATE_ACK) {
1274 pfsync_undefer_state(st, 0);
1275 }
1276 PF_STATE_UNLOCK(st);
1277 }
1278 /*
1279 * XXX this is not yet implemented, but we know the size of the
1280 * message so we can skip it.
1281 */
1282
1283 return (count * sizeof(struct pfsync_ins_ack));
1284 }
1285
1286 static int
pfsync_upd_tcp(struct pf_kstate * st,struct pf_state_peer_export * src,struct pf_state_peer_export * dst)1287 pfsync_upd_tcp(struct pf_kstate *st, struct pf_state_peer_export *src,
1288 struct pf_state_peer_export *dst)
1289 {
1290 int sync = 0;
1291
1292 PF_STATE_LOCK_ASSERT(st);
1293
1294 /*
1295 * The state should never go backwards except
1296 * for syn-proxy states. Neither should the
1297 * sequence window slide backwards.
1298 */
1299 if ((st->src.state > src->state &&
1300 (st->src.state < PF_TCPS_PROXY_SRC ||
1301 src->state >= PF_TCPS_PROXY_SRC)) ||
1302
1303 (st->src.state == src->state &&
1304 SEQ_GT(st->src.seqlo, ntohl(src->seqlo))))
1305 sync++;
1306 else
1307 pf_state_peer_ntoh(src, &st->src);
1308
1309 if ((st->dst.state > dst->state) ||
1310
1311 (st->dst.state >= TCPS_SYN_SENT &&
1312 SEQ_GT(st->dst.seqlo, ntohl(dst->seqlo))))
1313 sync++;
1314 else
1315 pf_state_peer_ntoh(dst, &st->dst);
1316
1317 return (sync);
1318 }
1319
1320 static int
pfsync_in_upd(struct mbuf * m,int offset,int count,int flags,int action)1321 pfsync_in_upd(struct mbuf *m, int offset, int count, int flags, int action)
1322 {
1323 struct pfsync_softc *sc = V_pfsyncif;
1324 union pfsync_state_union *sa, *sp;
1325 struct pf_kstate *st;
1326 struct mbuf *mp;
1327 int sync, offp, i, total_len, msg_len, msg_version;
1328 u_int8_t timeout;
1329
1330 switch (action) {
1331 case PFSYNC_ACT_UPD_1301:
1332 msg_len = sizeof(struct pfsync_state_1301);
1333 msg_version = PFSYNC_MSG_VERSION_1301;
1334 break;
1335 case PFSYNC_ACT_UPD_1400:
1336 msg_len = sizeof(struct pfsync_state_1400);
1337 msg_version = PFSYNC_MSG_VERSION_1400;
1338 break;
1339 case PFSYNC_ACT_UPD_1500:
1340 msg_len = sizeof(struct pfsync_state_1500);
1341 msg_version = PFSYNC_MSG_VERSION_1500;
1342 break;
1343 default:
1344 V_pfsyncstats.pfsyncs_badact++;
1345 return (-1);
1346 }
1347
1348 total_len = msg_len * count;
1349
1350 mp = m_pulldown(m, offset, total_len, &offp);
1351 if (mp == NULL) {
1352 V_pfsyncstats.pfsyncs_badlen++;
1353 return (-1);
1354 }
1355 sa = (union pfsync_state_union *)(mp->m_data + offp);
1356
1357 for (i = 0; i < count; i++) {
1358 sp = (union pfsync_state_union *)((char *)sa + msg_len * i);
1359
1360 switch (msg_version) {
1361 case PFSYNC_MSG_VERSION_1301:
1362 case PFSYNC_MSG_VERSION_1400:
1363 timeout = sp->pfs_1301.timeout;
1364 break;
1365 case PFSYNC_MSG_VERSION_1500:
1366 timeout = sp->pfs_1500.timeout;
1367 break;
1368 }
1369
1370 /* check for invalid values */
1371 if (timeout >= PFTM_MAX ||
1372 sp->pfs_1301.src.state > PF_TCPS_PROXY_DST ||
1373 sp->pfs_1301.dst.state > PF_TCPS_PROXY_DST) {
1374 if (V_pf_status.debug >= PF_DEBUG_MISC) {
1375 printf("pfsync_input: PFSYNC_ACT_UPD: "
1376 "invalid value\n");
1377 }
1378 V_pfsyncstats.pfsyncs_badval++;
1379 continue;
1380 }
1381
1382 st = pf_find_state_byid(sp->pfs_1301.id, sp->pfs_1301.creatorid);
1383 if (st == NULL) {
1384 /* insert the update */
1385 if (pfsync_state_import(sp, flags, msg_version))
1386 V_pfsyncstats.pfsyncs_badstate++;
1387 continue;
1388 }
1389
1390 if (st->state_flags & PFSTATE_ACK) {
1391 pfsync_undefer_state(st, 1);
1392 }
1393
1394 if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP)
1395 sync = pfsync_upd_tcp(st, &sp->pfs_1301.src, &sp->pfs_1301.dst);
1396 else {
1397 sync = 0;
1398
1399 /*
1400 * Non-TCP protocol state machine always go
1401 * forwards
1402 */
1403 if (st->src.state > sp->pfs_1301.src.state)
1404 sync++;
1405 else
1406 pf_state_peer_ntoh(&sp->pfs_1301.src, &st->src);
1407 if (st->dst.state > sp->pfs_1301.dst.state)
1408 sync++;
1409 else
1410 pf_state_peer_ntoh(&sp->pfs_1301.dst, &st->dst);
1411 }
1412 if (sync < 2) {
1413 pfsync_alloc_scrub_memory(&sp->pfs_1301.dst, &st->dst);
1414 pf_state_peer_ntoh(&sp->pfs_1301.dst, &st->dst);
1415 st->expire = pf_get_uptime();
1416 st->timeout = timeout;
1417 }
1418 st->pfsync_time = time_uptime;
1419
1420 if (sync) {
1421 V_pfsyncstats.pfsyncs_stale++;
1422
1423 pfsync_update_state(st);
1424 PF_STATE_UNLOCK(st);
1425 pfsync_push_all(sc);
1426 continue;
1427 }
1428 PF_STATE_UNLOCK(st);
1429 }
1430
1431 return (total_len);
1432 }
1433
1434 static int
pfsync_in_upd_c(struct mbuf * m,int offset,int count,int flags,int action)1435 pfsync_in_upd_c(struct mbuf *m, int offset, int count, int flags, int action)
1436 {
1437 struct pfsync_softc *sc = V_pfsyncif;
1438 struct pfsync_upd_c *ua, *up;
1439 struct pf_kstate *st;
1440 int len = count * sizeof(*up);
1441 int sync;
1442 struct mbuf *mp;
1443 int offp, i;
1444
1445 mp = m_pulldown(m, offset, len, &offp);
1446 if (mp == NULL) {
1447 V_pfsyncstats.pfsyncs_badlen++;
1448 return (-1);
1449 }
1450 ua = (struct pfsync_upd_c *)(mp->m_data + offp);
1451
1452 for (i = 0; i < count; i++) {
1453 up = &ua[i];
1454
1455 /* check for invalid values */
1456 if (up->timeout >= PFTM_MAX ||
1457 up->src.state > PF_TCPS_PROXY_DST ||
1458 up->dst.state > PF_TCPS_PROXY_DST) {
1459 if (V_pf_status.debug >= PF_DEBUG_MISC) {
1460 printf("pfsync_input: "
1461 "PFSYNC_ACT_UPD_C: "
1462 "invalid value\n");
1463 }
1464 V_pfsyncstats.pfsyncs_badval++;
1465 continue;
1466 }
1467
1468 st = pf_find_state_byid(up->id, up->creatorid);
1469 if (st == NULL) {
1470 /* We don't have this state. Ask for it. */
1471 PFSYNC_BUCKET_LOCK(&sc->sc_buckets[0]);
1472 pfsync_request_update(up->creatorid, up->id);
1473 PFSYNC_BUCKET_UNLOCK(&sc->sc_buckets[0]);
1474 continue;
1475 }
1476
1477 if (st->state_flags & PFSTATE_ACK) {
1478 pfsync_undefer_state(st, 1);
1479 }
1480
1481 if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP)
1482 sync = pfsync_upd_tcp(st, &up->src, &up->dst);
1483 else {
1484 sync = 0;
1485
1486 /*
1487 * Non-TCP protocol state machine always go
1488 * forwards
1489 */
1490 if (st->src.state > up->src.state)
1491 sync++;
1492 else
1493 pf_state_peer_ntoh(&up->src, &st->src);
1494 if (st->dst.state > up->dst.state)
1495 sync++;
1496 else
1497 pf_state_peer_ntoh(&up->dst, &st->dst);
1498 }
1499 if (sync < 2) {
1500 pfsync_alloc_scrub_memory(&up->dst, &st->dst);
1501 pf_state_peer_ntoh(&up->dst, &st->dst);
1502 st->expire = pf_get_uptime();
1503 st->timeout = up->timeout;
1504 }
1505 st->pfsync_time = time_uptime;
1506
1507 if (sync) {
1508 V_pfsyncstats.pfsyncs_stale++;
1509
1510 pfsync_update_state(st);
1511 PF_STATE_UNLOCK(st);
1512 pfsync_push_all(sc);
1513 continue;
1514 }
1515 PF_STATE_UNLOCK(st);
1516 }
1517
1518 return (len);
1519 }
1520
1521 static int
pfsync_in_ureq(struct mbuf * m,int offset,int count,int flags,int action)1522 pfsync_in_ureq(struct mbuf *m, int offset, int count, int flags, int action)
1523 {
1524 struct pfsync_upd_req *ur, *ura;
1525 struct mbuf *mp;
1526 int len = count * sizeof(*ur);
1527 int i, offp;
1528
1529 struct pf_kstate *st;
1530
1531 mp = m_pulldown(m, offset, len, &offp);
1532 if (mp == NULL) {
1533 V_pfsyncstats.pfsyncs_badlen++;
1534 return (-1);
1535 }
1536 ura = (struct pfsync_upd_req *)(mp->m_data + offp);
1537
1538 for (i = 0; i < count; i++) {
1539 ur = &ura[i];
1540
1541 if (ur->id == 0 && ur->creatorid == 0)
1542 pfsync_bulk_start();
1543 else {
1544 st = pf_find_state_byid(ur->id, ur->creatorid);
1545 if (st == NULL) {
1546 V_pfsyncstats.pfsyncs_badstate++;
1547 continue;
1548 }
1549 if (st->state_flags & PFSTATE_NOSYNC) {
1550 PF_STATE_UNLOCK(st);
1551 continue;
1552 }
1553
1554 pfsync_update_state_req(st);
1555 PF_STATE_UNLOCK(st);
1556 }
1557 }
1558
1559 return (len);
1560 }
1561
1562 static int
pfsync_in_del_c(struct mbuf * m,int offset,int count,int flags,int action)1563 pfsync_in_del_c(struct mbuf *m, int offset, int count, int flags, int action)
1564 {
1565 struct mbuf *mp;
1566 struct pfsync_del_c *sa, *sp;
1567 struct pf_kstate *st;
1568 int len = count * sizeof(*sp);
1569 int offp, i;
1570
1571 mp = m_pulldown(m, offset, len, &offp);
1572 if (mp == NULL) {
1573 V_pfsyncstats.pfsyncs_badlen++;
1574 return (-1);
1575 }
1576 sa = (struct pfsync_del_c *)(mp->m_data + offp);
1577
1578 for (i = 0; i < count; i++) {
1579 sp = &sa[i];
1580
1581 st = pf_find_state_byid(sp->id, sp->creatorid);
1582 if (st == NULL) {
1583 V_pfsyncstats.pfsyncs_badstate++;
1584 continue;
1585 }
1586
1587 st->state_flags |= PFSTATE_NOSYNC;
1588 pf_remove_state(st);
1589 }
1590
1591 return (len);
1592 }
1593
1594 static int
pfsync_in_bus(struct mbuf * m,int offset,int count,int flags,int action)1595 pfsync_in_bus(struct mbuf *m, int offset, int count, int flags, int action)
1596 {
1597 struct pfsync_softc *sc = V_pfsyncif;
1598 struct pfsync_bus *bus;
1599 struct mbuf *mp;
1600 int len = count * sizeof(*bus);
1601 int offp;
1602
1603 PFSYNC_BLOCK(sc);
1604
1605 /* If we're not waiting for a bulk update, who cares. */
1606 if (sc->sc_ureq_sent == 0) {
1607 PFSYNC_BUNLOCK(sc);
1608 return (len);
1609 }
1610
1611 mp = m_pulldown(m, offset, len, &offp);
1612 if (mp == NULL) {
1613 PFSYNC_BUNLOCK(sc);
1614 V_pfsyncstats.pfsyncs_badlen++;
1615 return (-1);
1616 }
1617 bus = (struct pfsync_bus *)(mp->m_data + offp);
1618
1619 switch (bus->status) {
1620 case PFSYNC_BUS_START:
1621 callout_reset(&sc->sc_bulkfail_tmo, 4 * hz +
1622 V_pf_limits[PF_LIMIT_STATES].limit /
1623 ((sc->sc_ifp->if_mtu - PFSYNC_MINPKT) /
1624 sizeof(union pfsync_state_union)),
1625 pfsync_bulk_fail, sc);
1626 if (V_pf_status.debug >= PF_DEBUG_MISC)
1627 printf("pfsync: received bulk update start\n");
1628 break;
1629
1630 case PFSYNC_BUS_END:
1631 if (time_uptime - ntohl(bus->endtime) >=
1632 sc->sc_ureq_sent) {
1633 /* that's it, we're happy */
1634 sc->sc_ureq_sent = 0;
1635 sc->sc_bulk_tries = 0;
1636 callout_stop(&sc->sc_bulkfail_tmo);
1637 if (!(sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p)
1638 (*carp_demote_adj_p)(-V_pfsync_carp_adj,
1639 "pfsync bulk done");
1640 sc->sc_flags |= PFSYNCF_OK;
1641 if (V_pf_status.debug >= PF_DEBUG_MISC)
1642 printf("pfsync: received valid "
1643 "bulk update end\n");
1644 } else {
1645 if (V_pf_status.debug >= PF_DEBUG_MISC)
1646 printf("pfsync: received invalid "
1647 "bulk update end: bad timestamp\n");
1648 }
1649 break;
1650 }
1651 PFSYNC_BUNLOCK(sc);
1652
1653 return (len);
1654 }
1655
1656 static int
pfsync_in_tdb(struct mbuf * m,int offset,int count,int flags,int action)1657 pfsync_in_tdb(struct mbuf *m, int offset, int count, int flags, int action)
1658 {
1659 int len = count * sizeof(struct pfsync_tdb);
1660
1661 #if defined(IPSEC)
1662 struct pfsync_tdb *tp;
1663 struct mbuf *mp;
1664 int offp;
1665 int i;
1666 int s;
1667
1668 mp = m_pulldown(m, offset, len, &offp);
1669 if (mp == NULL) {
1670 V_pfsyncstats.pfsyncs_badlen++;
1671 return (-1);
1672 }
1673 tp = (struct pfsync_tdb *)(mp->m_data + offp);
1674
1675 for (i = 0; i < count; i++)
1676 pfsync_update_net_tdb(&tp[i]);
1677 #endif
1678
1679 return (len);
1680 }
1681
1682 #if defined(IPSEC)
1683 /* Update an in-kernel tdb. Silently fail if no tdb is found. */
1684 static void
pfsync_update_net_tdb(struct pfsync_tdb * pt)1685 pfsync_update_net_tdb(struct pfsync_tdb *pt)
1686 {
1687 struct tdb *tdb;
1688 int s;
1689
1690 /* check for invalid values */
1691 if (ntohl(pt->spi) <= SPI_RESERVED_MAX ||
1692 (pt->dst.sa.sa_family != AF_INET &&
1693 pt->dst.sa.sa_family != AF_INET6))
1694 goto bad;
1695
1696 tdb = gettdb(pt->spi, &pt->dst, pt->sproto);
1697 if (tdb) {
1698 pt->rpl = ntohl(pt->rpl);
1699 pt->cur_bytes = (unsigned long long)be64toh(pt->cur_bytes);
1700
1701 /* Neither replay nor byte counter should ever decrease. */
1702 if (pt->rpl < tdb->tdb_rpl ||
1703 pt->cur_bytes < tdb->tdb_cur_bytes) {
1704 goto bad;
1705 }
1706
1707 tdb->tdb_rpl = pt->rpl;
1708 tdb->tdb_cur_bytes = pt->cur_bytes;
1709 }
1710 return;
1711
1712 bad:
1713 if (V_pf_status.debug >= PF_DEBUG_MISC)
1714 printf("pfsync_insert: PFSYNC_ACT_TDB_UPD: "
1715 "invalid value\n");
1716 V_pfsyncstats.pfsyncs_badstate++;
1717 return;
1718 }
1719 #endif
1720
1721 static int
pfsync_in_eof(struct mbuf * m,int offset,int count,int flags,int action)1722 pfsync_in_eof(struct mbuf *m, int offset, int count, int flags, int action)
1723 {
1724 /* check if we are at the right place in the packet */
1725 if (offset != m->m_pkthdr.len)
1726 V_pfsyncstats.pfsyncs_badlen++;
1727
1728 /* we're done. free and let the caller return */
1729 m_freem(m);
1730 return (-1);
1731 }
1732
1733 static int
pfsync_in_error(struct mbuf * m,int offset,int count,int flags,int action)1734 pfsync_in_error(struct mbuf *m, int offset, int count, int flags, int action)
1735 {
1736 V_pfsyncstats.pfsyncs_badact++;
1737
1738 m_freem(m);
1739 return (-1);
1740 }
1741
1742 static int
pfsyncoutput(struct ifnet * ifp,struct mbuf * m,const struct sockaddr * dst,struct route * rt)1743 pfsyncoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
1744 struct route *rt)
1745 {
1746 m_freem(m);
1747 return (0);
1748 }
1749
1750 /* ARGSUSED */
1751 static int
pfsyncioctl(struct ifnet * ifp,u_long cmd,caddr_t data)1752 pfsyncioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
1753 {
1754 struct pfsync_softc *sc = ifp->if_softc;
1755 struct ifreq *ifr = (struct ifreq *)data;
1756 struct pfsyncreq pfsyncr;
1757 size_t nvbuflen;
1758 int error;
1759 int c;
1760
1761 switch (cmd) {
1762 case SIOCSIFFLAGS:
1763 PFSYNC_LOCK(sc);
1764 if (ifp->if_flags & IFF_UP) {
1765 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1766 PFSYNC_UNLOCK(sc);
1767 pfsync_pointers_init();
1768 } else {
1769 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1770 PFSYNC_UNLOCK(sc);
1771 pfsync_pointers_uninit();
1772 }
1773 break;
1774 case SIOCSIFMTU:
1775 if (!sc->sc_sync_if ||
1776 ifr->ifr_mtu <= PFSYNC_MINPKT ||
1777 ifr->ifr_mtu > sc->sc_sync_if->if_mtu)
1778 return (EINVAL);
1779 if (ifr->ifr_mtu < ifp->if_mtu) {
1780 for (c = 0; c < pfsync_buckets; c++) {
1781 PFSYNC_BUCKET_LOCK(&sc->sc_buckets[c]);
1782 if (sc->sc_buckets[c].b_len > PFSYNC_MINPKT)
1783 pfsync_sendout(1, c);
1784 PFSYNC_BUCKET_UNLOCK(&sc->sc_buckets[c]);
1785 }
1786 }
1787 ifp->if_mtu = ifr->ifr_mtu;
1788 break;
1789 case SIOCGETPFSYNC:
1790 bzero(&pfsyncr, sizeof(pfsyncr));
1791 PFSYNC_LOCK(sc);
1792 if (sc->sc_sync_if) {
1793 strlcpy(pfsyncr.pfsyncr_syncdev,
1794 sc->sc_sync_if->if_xname, IFNAMSIZ);
1795 }
1796 pfsyncr.pfsyncr_syncpeer = ((struct sockaddr_in *)&sc->sc_sync_peer)->sin_addr;
1797 pfsyncr.pfsyncr_maxupdates = sc->sc_maxupdates;
1798 pfsyncr.pfsyncr_defer = sc->sc_flags;
1799 PFSYNC_UNLOCK(sc);
1800 return (copyout(&pfsyncr, ifr_data_get_ptr(ifr),
1801 sizeof(pfsyncr)));
1802
1803 case SIOCGETPFSYNCNV:
1804 {
1805 nvlist_t *nvl_syncpeer;
1806 nvlist_t *nvl = nvlist_create(0);
1807
1808 if (nvl == NULL)
1809 return (ENOMEM);
1810
1811 if (sc->sc_sync_if)
1812 nvlist_add_string(nvl, "syncdev", sc->sc_sync_if->if_xname);
1813 nvlist_add_number(nvl, "maxupdates", sc->sc_maxupdates);
1814 nvlist_add_number(nvl, "flags", sc->sc_flags);
1815 nvlist_add_number(nvl, "version", sc->sc_version);
1816 if ((nvl_syncpeer = pfsync_sockaddr_to_syncpeer_nvlist(&sc->sc_sync_peer)) != NULL)
1817 nvlist_add_nvlist(nvl, "syncpeer", nvl_syncpeer);
1818
1819 void *packed = NULL;
1820 packed = nvlist_pack(nvl, &nvbuflen);
1821 if (packed == NULL) {
1822 free(packed, M_NVLIST);
1823 nvlist_destroy(nvl);
1824 return (ENOMEM);
1825 }
1826
1827 if (nvbuflen > ifr->ifr_cap_nv.buf_length) {
1828 ifr->ifr_cap_nv.length = nvbuflen;
1829 ifr->ifr_cap_nv.buffer = NULL;
1830 free(packed, M_NVLIST);
1831 nvlist_destroy(nvl);
1832 return (EFBIG);
1833 }
1834
1835 ifr->ifr_cap_nv.length = nvbuflen;
1836 error = copyout(packed, ifr->ifr_cap_nv.buffer, nvbuflen);
1837
1838 nvlist_destroy(nvl);
1839 nvlist_destroy(nvl_syncpeer);
1840 free(packed, M_NVLIST);
1841 break;
1842 }
1843
1844 case SIOCSETPFSYNC:
1845 {
1846 struct pfsync_kstatus status;
1847
1848 if ((error = priv_check(curthread, PRIV_NETINET_PF)) != 0)
1849 return (error);
1850 if ((error = copyin(ifr_data_get_ptr(ifr), &pfsyncr,
1851 sizeof(pfsyncr))))
1852 return (error);
1853
1854 memset((char *)&status, 0, sizeof(struct pfsync_kstatus));
1855 pfsync_pfsyncreq_to_kstatus(&pfsyncr, &status);
1856
1857 error = pfsync_kstatus_to_softc(&status, sc);
1858 return (error);
1859 }
1860 case SIOCSETPFSYNCNV:
1861 {
1862 struct pfsync_kstatus status;
1863 void *data;
1864 nvlist_t *nvl;
1865
1866 if ((error = priv_check(curthread, PRIV_NETINET_PF)) != 0)
1867 return (error);
1868 if (ifr->ifr_cap_nv.length > IFR_CAP_NV_MAXBUFSIZE)
1869 return (EINVAL);
1870
1871 data = malloc(ifr->ifr_cap_nv.length, M_PF, M_WAITOK);
1872
1873 if ((error = copyin(ifr->ifr_cap_nv.buffer, data,
1874 ifr->ifr_cap_nv.length)) != 0) {
1875 free(data, M_PF);
1876 return (error);
1877 }
1878
1879 if ((nvl = nvlist_unpack(data, ifr->ifr_cap_nv.length, 0)) == NULL) {
1880 free(data, M_PF);
1881 return (EINVAL);
1882 }
1883
1884 memset((char *)&status, 0, sizeof(struct pfsync_kstatus));
1885 pfsync_nvstatus_to_kstatus(nvl, &status);
1886
1887 nvlist_destroy(nvl);
1888 free(data, M_PF);
1889
1890 error = pfsync_kstatus_to_softc(&status, sc);
1891 return (error);
1892 }
1893 default:
1894 return (ENOTTY);
1895 }
1896
1897 return (0);
1898 }
1899
1900 static void
pfsync_out_state_1301(struct pf_kstate * st,void * buf)1901 pfsync_out_state_1301(struct pf_kstate *st, void *buf)
1902 {
1903 struct pfsync_state_1301 *sp;
1904
1905 sp = buf;
1906 pfsync_state_export_1301(sp, st);
1907 }
1908
1909 static void
pfsync_out_state_1400(struct pf_kstate * st,void * buf)1910 pfsync_out_state_1400(struct pf_kstate *st, void *buf)
1911 {
1912 struct pfsync_state_1400 *sp;
1913
1914 sp = buf;
1915 pfsync_state_export_1400(sp, st);
1916 }
1917
1918 static void
pfsync_out_state_1500(struct pf_kstate * st,void * buf)1919 pfsync_out_state_1500(struct pf_kstate *st, void *buf)
1920 {
1921 struct pfsync_state_1500 *sp;
1922
1923 sp = buf;
1924 pfsync_state_export_1500(sp, st);
1925 }
1926
1927 static void
pfsync_out_iack(struct pf_kstate * st,void * buf)1928 pfsync_out_iack(struct pf_kstate *st, void *buf)
1929 {
1930 struct pfsync_ins_ack *iack = buf;
1931
1932 iack->id = st->id;
1933 iack->creatorid = st->creatorid;
1934 }
1935
1936 static void
pfsync_out_upd_c(struct pf_kstate * st,void * buf)1937 pfsync_out_upd_c(struct pf_kstate *st, void *buf)
1938 {
1939 struct pfsync_upd_c *up = buf;
1940
1941 bzero(up, sizeof(*up));
1942 up->id = st->id;
1943 pf_state_peer_hton(&st->src, &up->src);
1944 pf_state_peer_hton(&st->dst, &up->dst);
1945 up->creatorid = st->creatorid;
1946 up->timeout = st->timeout;
1947 }
1948
1949 static void
pfsync_out_del_c(struct pf_kstate * st,void * buf)1950 pfsync_out_del_c(struct pf_kstate *st, void *buf)
1951 {
1952 struct pfsync_del_c *dp = buf;
1953
1954 dp->id = st->id;
1955 dp->creatorid = st->creatorid;
1956 st->state_flags |= PFSTATE_NOSYNC;
1957 }
1958
1959 static void
pfsync_drop_all(struct pfsync_softc * sc)1960 pfsync_drop_all(struct pfsync_softc *sc)
1961 {
1962 struct pfsync_bucket *b;
1963 int c;
1964
1965 for (c = 0; c < pfsync_buckets; c++) {
1966 b = &sc->sc_buckets[c];
1967
1968 PFSYNC_BUCKET_LOCK(b);
1969 pfsync_drop(sc, c);
1970 PFSYNC_BUCKET_UNLOCK(b);
1971 }
1972 }
1973
1974 static void
pfsync_drop(struct pfsync_softc * sc,int c)1975 pfsync_drop(struct pfsync_softc *sc, int c)
1976 {
1977 struct pf_kstate *st, *next;
1978 struct pfsync_upd_req_item *ur;
1979 struct pfsync_bucket *b;
1980 enum pfsync_q_id q;
1981
1982 b = &sc->sc_buckets[c];
1983 PFSYNC_BUCKET_LOCK_ASSERT(b);
1984
1985 for (q = 0; q < PFSYNC_Q_COUNT; q++) {
1986 if (TAILQ_EMPTY(&b->b_qs[q]))
1987 continue;
1988
1989 TAILQ_FOREACH_SAFE(st, &b->b_qs[q], sync_list, next) {
1990 KASSERT(st->sync_state == pfsync_qid_sstate[q],
1991 ("%s: st->sync_state %d == q %d",
1992 __func__, st->sync_state, q));
1993 st->sync_state = PFSYNC_S_NONE;
1994 pf_release_state(st);
1995 }
1996 TAILQ_INIT(&b->b_qs[q]);
1997 }
1998
1999 while ((ur = TAILQ_FIRST(&b->b_upd_req_list)) != NULL) {
2000 TAILQ_REMOVE(&b->b_upd_req_list, ur, ur_entry);
2001 free(ur, M_PFSYNC);
2002 }
2003
2004 b->b_len = PFSYNC_MINPKT;
2005 free(b->b_plus, M_PFSYNC);
2006 b->b_plus = NULL;
2007 b->b_pluslen = 0;
2008 }
2009
2010 static void
pfsync_sendout(int schedswi,int c)2011 pfsync_sendout(int schedswi, int c)
2012 {
2013 struct pfsync_softc *sc = V_pfsyncif;
2014 struct ifnet *ifp = sc->sc_ifp;
2015 struct mbuf *m;
2016 struct pfsync_header *ph;
2017 struct pfsync_subheader *subh;
2018 struct pf_kstate *st, *st_next;
2019 struct pfsync_upd_req_item *ur;
2020 struct pfsync_bucket *b = &sc->sc_buckets[c];
2021 size_t len;
2022 int aflen, offset, count = 0;
2023 enum pfsync_q_id q;
2024
2025 KASSERT(sc != NULL, ("%s: null sc", __func__));
2026 KASSERT(b->b_len > PFSYNC_MINPKT,
2027 ("%s: sc_len %zu", __func__, b->b_len));
2028 PFSYNC_BUCKET_LOCK_ASSERT(b);
2029
2030 if (!bpf_peers_present(ifp->if_bpf) && sc->sc_sync_if == NULL) {
2031 pfsync_drop(sc, c);
2032 return;
2033 }
2034
2035 m = m_get2(max_linkhdr + b->b_len, M_NOWAIT, MT_DATA, M_PKTHDR);
2036 if (m == NULL) {
2037 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
2038 V_pfsyncstats.pfsyncs_onomem++;
2039 return;
2040 }
2041 m->m_data += max_linkhdr;
2042 bzero(m->m_data, b->b_len);
2043
2044 len = b->b_len;
2045
2046 /* build the ip header */
2047 switch (sc->sc_sync_peer.ss_family) {
2048 #ifdef INET
2049 case AF_INET:
2050 {
2051 struct ip *ip;
2052
2053 ip = mtod(m, struct ip *);
2054 bcopy(&sc->sc_template.ipv4, ip, sizeof(*ip));
2055 aflen = offset = sizeof(*ip);
2056
2057 len -= sizeof(union inet_template) - sizeof(struct ip);
2058 ip->ip_len = htons(len);
2059 ip_fillid(ip, V_ip_random_id);
2060 break;
2061 }
2062 #endif
2063 #ifdef INET6
2064 case AF_INET6:
2065 {
2066 struct ip6_hdr *ip6;
2067
2068 ip6 = mtod(m, struct ip6_hdr *);
2069 bcopy(&sc->sc_template.ipv6, ip6, sizeof(*ip6));
2070 aflen = offset = sizeof(*ip6);
2071
2072 len -= sizeof(union inet_template) - sizeof(struct ip6_hdr);
2073 ip6->ip6_plen = htons(len);
2074 break;
2075 }
2076 #endif
2077 default:
2078 m_freem(m);
2079 pfsync_drop(sc, c);
2080 return;
2081 }
2082 m->m_len = m->m_pkthdr.len = len;
2083
2084 /* build the pfsync header */
2085 ph = (struct pfsync_header *)(m->m_data + offset);
2086 offset += sizeof(*ph);
2087
2088 ph->version = PFSYNC_VERSION;
2089 ph->len = htons(len - aflen);
2090 bcopy(V_pf_status.pf_chksum, ph->pfcksum, PF_MD5_DIGEST_LENGTH);
2091
2092 /* walk the queues */
2093 for (q = 0; q < PFSYNC_Q_COUNT; q++) {
2094 if (TAILQ_EMPTY(&b->b_qs[q]))
2095 continue;
2096
2097 subh = (struct pfsync_subheader *)(m->m_data + offset);
2098 offset += sizeof(*subh);
2099
2100 count = 0;
2101 TAILQ_FOREACH_SAFE(st, &b->b_qs[q], sync_list, st_next) {
2102 KASSERT(st->sync_state == pfsync_qid_sstate[q],
2103 ("%s: st->sync_state == q",
2104 __func__));
2105 /*
2106 * XXXGL: some of write methods do unlocked reads
2107 * of state data :(
2108 */
2109 pfsync_qs[q].write(st, m->m_data + offset);
2110 offset += pfsync_qs[q].len;
2111 st->sync_state = PFSYNC_S_NONE;
2112 pf_release_state(st);
2113 count++;
2114 }
2115 TAILQ_INIT(&b->b_qs[q]);
2116
2117 subh->action = pfsync_qs[q].action;
2118 subh->count = htons(count);
2119 V_pfsyncstats.pfsyncs_oacts[pfsync_qs[q].action] += count;
2120 }
2121
2122 if (!TAILQ_EMPTY(&b->b_upd_req_list)) {
2123 subh = (struct pfsync_subheader *)(m->m_data + offset);
2124 offset += sizeof(*subh);
2125
2126 count = 0;
2127 while ((ur = TAILQ_FIRST(&b->b_upd_req_list)) != NULL) {
2128 TAILQ_REMOVE(&b->b_upd_req_list, ur, ur_entry);
2129
2130 bcopy(&ur->ur_msg, m->m_data + offset,
2131 sizeof(ur->ur_msg));
2132 offset += sizeof(ur->ur_msg);
2133 free(ur, M_PFSYNC);
2134 count++;
2135 }
2136
2137 subh->action = PFSYNC_ACT_UPD_REQ;
2138 subh->count = htons(count);
2139 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_UPD_REQ] += count;
2140 }
2141
2142 /* has someone built a custom region for us to add? */
2143 if (b->b_plus != NULL) {
2144 bcopy(b->b_plus, m->m_data + offset, b->b_pluslen);
2145 offset += b->b_pluslen;
2146
2147 free(b->b_plus, M_PFSYNC);
2148 b->b_plus = NULL;
2149 b->b_pluslen = 0;
2150 }
2151
2152 subh = (struct pfsync_subheader *)(m->m_data + offset);
2153 offset += sizeof(*subh);
2154
2155 subh->action = PFSYNC_ACT_EOF;
2156 subh->count = htons(1);
2157 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_EOF]++;
2158
2159 /* we're done, let's put it on the wire */
2160 if (bpf_peers_present(ifp->if_bpf)) {
2161 m->m_data += aflen;
2162 m->m_len = m->m_pkthdr.len = len - aflen;
2163 bpf_mtap(ifp->if_bpf, m);
2164 m->m_data -= aflen;
2165 m->m_len = m->m_pkthdr.len = len;
2166 }
2167
2168 if (sc->sc_sync_if == NULL) {
2169 b->b_len = PFSYNC_MINPKT;
2170 m_freem(m);
2171 return;
2172 }
2173
2174 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1);
2175 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len);
2176 b->b_len = PFSYNC_MINPKT;
2177
2178 if (!_IF_QFULL(&b->b_snd))
2179 _IF_ENQUEUE(&b->b_snd, m);
2180 else {
2181 m_freem(m);
2182 if_inc_counter(sc->sc_ifp, IFCOUNTER_OQDROPS, 1);
2183 }
2184 if (schedswi)
2185 swi_sched(V_pfsync_swi_cookie, 0);
2186 }
2187
2188 static void
pfsync_insert_state(struct pf_kstate * st)2189 pfsync_insert_state(struct pf_kstate *st)
2190 {
2191 struct pfsync_softc *sc = V_pfsyncif;
2192 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
2193
2194 if (st->state_flags & PFSTATE_NOSYNC)
2195 return;
2196
2197 if ((st->rule->rule_flag & PFRULE_NOSYNC) ||
2198 st->key[PF_SK_WIRE]->proto == IPPROTO_PFSYNC) {
2199 st->state_flags |= PFSTATE_NOSYNC;
2200 return;
2201 }
2202
2203 KASSERT(st->sync_state == PFSYNC_S_NONE,
2204 ("%s: st->sync_state %u", __func__, st->sync_state));
2205
2206 PFSYNC_BUCKET_LOCK(b);
2207 if (b->b_len == PFSYNC_MINPKT)
2208 callout_reset(&b->b_tmo, 1 * hz, pfsync_timeout, b);
2209
2210 pfsync_q_ins(st, PFSYNC_S_INS, true);
2211 PFSYNC_BUCKET_UNLOCK(b);
2212
2213 st->sync_updates = 0;
2214 }
2215
2216 static int
pfsync_defer(struct pf_kstate * st,struct mbuf * m)2217 pfsync_defer(struct pf_kstate *st, struct mbuf *m)
2218 {
2219 struct pfsync_softc *sc = V_pfsyncif;
2220 struct pfsync_deferral *pd;
2221 struct pfsync_bucket *b;
2222
2223 if (m->m_flags & (M_BCAST|M_MCAST))
2224 return (0);
2225
2226 if (sc == NULL)
2227 return (0);
2228
2229 b = pfsync_get_bucket(sc, st);
2230
2231 PFSYNC_LOCK(sc);
2232
2233 if (!(sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) ||
2234 !(sc->sc_flags & PFSYNCF_DEFER)) {
2235 PFSYNC_UNLOCK(sc);
2236 return (0);
2237 }
2238
2239 PFSYNC_BUCKET_LOCK(b);
2240 PFSYNC_UNLOCK(sc);
2241
2242 if (b->b_deferred >= 128)
2243 pfsync_undefer(TAILQ_FIRST(&b->b_deferrals), 0);
2244
2245 pd = malloc(sizeof(*pd), M_PFSYNC, M_NOWAIT);
2246 if (pd == NULL) {
2247 PFSYNC_BUCKET_UNLOCK(b);
2248 return (0);
2249 }
2250 b->b_deferred++;
2251
2252 m->m_flags |= M_SKIP_FIREWALL;
2253 st->state_flags |= PFSTATE_ACK;
2254
2255 pd->pd_sc = sc;
2256 pd->pd_st = st;
2257 pf_ref_state(st);
2258 pd->pd_m = m;
2259
2260 TAILQ_INSERT_TAIL(&b->b_deferrals, pd, pd_entry);
2261 callout_init_mtx(&pd->pd_tmo, &b->b_mtx, CALLOUT_RETURNUNLOCKED);
2262 callout_reset(&pd->pd_tmo, (V_pfsync_defer_timeout * hz) / 1000,
2263 pfsync_defer_tmo, pd);
2264
2265 pfsync_push(b);
2266 PFSYNC_BUCKET_UNLOCK(b);
2267
2268 return (1);
2269 }
2270
2271 static void
pfsync_undefer(struct pfsync_deferral * pd,int drop)2272 pfsync_undefer(struct pfsync_deferral *pd, int drop)
2273 {
2274 struct pfsync_softc *sc = pd->pd_sc;
2275 struct mbuf *m = pd->pd_m;
2276 struct pf_kstate *st = pd->pd_st;
2277 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
2278
2279 PFSYNC_BUCKET_LOCK_ASSERT(b);
2280
2281 TAILQ_REMOVE(&b->b_deferrals, pd, pd_entry);
2282 b->b_deferred--;
2283 pd->pd_st->state_flags &= ~PFSTATE_ACK; /* XXX: locking! */
2284 free(pd, M_PFSYNC);
2285 pf_release_state(st);
2286
2287 if (drop)
2288 m_freem(m);
2289 else {
2290 _IF_ENQUEUE(&b->b_snd, m);
2291 pfsync_push(b);
2292 }
2293 }
2294
2295 static void
pfsync_defer_tmo(void * arg)2296 pfsync_defer_tmo(void *arg)
2297 {
2298 struct epoch_tracker et;
2299 struct pfsync_deferral *pd = arg;
2300 struct pfsync_softc *sc = pd->pd_sc;
2301 struct mbuf *m = pd->pd_m;
2302 struct pf_kstate *st = pd->pd_st;
2303 struct pfsync_bucket *b;
2304
2305 CURVNET_SET(sc->sc_ifp->if_vnet);
2306
2307 b = pfsync_get_bucket(sc, st);
2308
2309 PFSYNC_BUCKET_LOCK_ASSERT(b);
2310
2311 TAILQ_REMOVE(&b->b_deferrals, pd, pd_entry);
2312 b->b_deferred--;
2313 pd->pd_st->state_flags &= ~PFSTATE_ACK; /* XXX: locking! */
2314 PFSYNC_BUCKET_UNLOCK(b);
2315 free(pd, M_PFSYNC);
2316
2317 if (sc->sc_sync_if == NULL) {
2318 pf_release_state(st);
2319 m_freem(m);
2320 CURVNET_RESTORE();
2321 return;
2322 }
2323
2324 NET_EPOCH_ENTER(et);
2325
2326 pfsync_tx(sc, m);
2327
2328 pf_release_state(st);
2329
2330 CURVNET_RESTORE();
2331 NET_EPOCH_EXIT(et);
2332 }
2333
2334 static void
pfsync_undefer_state_locked(struct pf_kstate * st,int drop)2335 pfsync_undefer_state_locked(struct pf_kstate *st, int drop)
2336 {
2337 struct pfsync_softc *sc = V_pfsyncif;
2338 struct pfsync_deferral *pd;
2339 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
2340
2341 PFSYNC_BUCKET_LOCK_ASSERT(b);
2342
2343 TAILQ_FOREACH(pd, &b->b_deferrals, pd_entry) {
2344 if (pd->pd_st == st) {
2345 if (callout_stop(&pd->pd_tmo) > 0)
2346 pfsync_undefer(pd, drop);
2347
2348 return;
2349 }
2350 }
2351
2352 panic("%s: unable to find deferred state", __func__);
2353 }
2354
2355 static void
pfsync_undefer_state(struct pf_kstate * st,int drop)2356 pfsync_undefer_state(struct pf_kstate *st, int drop)
2357 {
2358 struct pfsync_softc *sc = V_pfsyncif;
2359 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
2360
2361 PFSYNC_BUCKET_LOCK(b);
2362 pfsync_undefer_state_locked(st, drop);
2363 PFSYNC_BUCKET_UNLOCK(b);
2364 }
2365
2366 static struct pfsync_bucket*
pfsync_get_bucket(struct pfsync_softc * sc,struct pf_kstate * st)2367 pfsync_get_bucket(struct pfsync_softc *sc, struct pf_kstate *st)
2368 {
2369 int c = PF_IDHASH(st) % pfsync_buckets;
2370 return &sc->sc_buckets[c];
2371 }
2372
2373 static void
pfsync_update_state(struct pf_kstate * st)2374 pfsync_update_state(struct pf_kstate *st)
2375 {
2376 struct pfsync_softc *sc = V_pfsyncif;
2377 bool sync = false, ref = true;
2378 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
2379
2380 PF_STATE_LOCK_ASSERT(st);
2381 PFSYNC_BUCKET_LOCK(b);
2382
2383 if (st->state_flags & PFSTATE_ACK)
2384 pfsync_undefer_state_locked(st, 0);
2385 if (st->state_flags & PFSTATE_NOSYNC) {
2386 if (st->sync_state != PFSYNC_S_NONE)
2387 pfsync_q_del(st, true, b);
2388 PFSYNC_BUCKET_UNLOCK(b);
2389 return;
2390 }
2391
2392 if (b->b_len == PFSYNC_MINPKT)
2393 callout_reset(&b->b_tmo, 1 * hz, pfsync_timeout, b);
2394
2395 switch (st->sync_state) {
2396 case PFSYNC_S_UPD_C:
2397 case PFSYNC_S_UPD:
2398 case PFSYNC_S_INS:
2399 /* we're already handling it */
2400
2401 if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP) {
2402 st->sync_updates++;
2403 if (st->sync_updates >= sc->sc_maxupdates)
2404 sync = true;
2405 }
2406 break;
2407
2408 case PFSYNC_S_IACK:
2409 pfsync_q_del(st, false, b);
2410 ref = false;
2411 /* FALLTHROUGH */
2412
2413 case PFSYNC_S_NONE:
2414 pfsync_q_ins(st, PFSYNC_S_UPD_C, ref);
2415 st->sync_updates = 0;
2416 break;
2417
2418 default:
2419 panic("%s: unexpected sync state %d", __func__, st->sync_state);
2420 }
2421
2422 if (sync || (time_uptime - st->pfsync_time) < 2)
2423 pfsync_push(b);
2424
2425 PFSYNC_BUCKET_UNLOCK(b);
2426 }
2427
2428 static void
pfsync_request_update(u_int32_t creatorid,u_int64_t id)2429 pfsync_request_update(u_int32_t creatorid, u_int64_t id)
2430 {
2431 struct pfsync_softc *sc = V_pfsyncif;
2432 struct pfsync_bucket *b = &sc->sc_buckets[0];
2433 struct pfsync_upd_req_item *item;
2434 size_t nlen = sizeof(struct pfsync_upd_req);
2435
2436 PFSYNC_BUCKET_LOCK_ASSERT(b);
2437
2438 /*
2439 * This code does a bit to prevent multiple update requests for the
2440 * same state being generated. It searches current subheader queue,
2441 * but it doesn't lookup into queue of already packed datagrams.
2442 */
2443 TAILQ_FOREACH(item, &b->b_upd_req_list, ur_entry)
2444 if (item->ur_msg.id == id &&
2445 item->ur_msg.creatorid == creatorid)
2446 return;
2447
2448 item = malloc(sizeof(*item), M_PFSYNC, M_NOWAIT);
2449 if (item == NULL)
2450 return; /* XXX stats */
2451
2452 item->ur_msg.id = id;
2453 item->ur_msg.creatorid = creatorid;
2454
2455 if (TAILQ_EMPTY(&b->b_upd_req_list))
2456 nlen += sizeof(struct pfsync_subheader);
2457
2458 if (b->b_len + nlen > sc->sc_ifp->if_mtu) {
2459 pfsync_sendout(0, 0);
2460
2461 nlen = sizeof(struct pfsync_subheader) +
2462 sizeof(struct pfsync_upd_req);
2463 }
2464
2465 TAILQ_INSERT_TAIL(&b->b_upd_req_list, item, ur_entry);
2466 b->b_len += nlen;
2467
2468 pfsync_push(b);
2469 }
2470
2471 static bool
pfsync_update_state_req(struct pf_kstate * st)2472 pfsync_update_state_req(struct pf_kstate *st)
2473 {
2474 struct pfsync_softc *sc = V_pfsyncif;
2475 bool ref = true, full = false;
2476 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
2477
2478 PF_STATE_LOCK_ASSERT(st);
2479 PFSYNC_BUCKET_LOCK(b);
2480
2481 if (st->state_flags & PFSTATE_NOSYNC) {
2482 if (st->sync_state != PFSYNC_S_NONE)
2483 pfsync_q_del(st, true, b);
2484 PFSYNC_BUCKET_UNLOCK(b);
2485 return (full);
2486 }
2487
2488 switch (st->sync_state) {
2489 case PFSYNC_S_UPD_C:
2490 case PFSYNC_S_IACK:
2491 pfsync_q_del(st, false, b);
2492 ref = false;
2493 /* FALLTHROUGH */
2494
2495 case PFSYNC_S_NONE:
2496 pfsync_q_ins(st, PFSYNC_S_UPD, ref);
2497 pfsync_push(b);
2498 break;
2499
2500 case PFSYNC_S_INS:
2501 case PFSYNC_S_UPD:
2502 case PFSYNC_S_DEL_C:
2503 /* we're already handling it */
2504 break;
2505
2506 default:
2507 panic("%s: unexpected sync state %d", __func__, st->sync_state);
2508 }
2509
2510 if ((sc->sc_ifp->if_mtu - b->b_len) < sizeof(union pfsync_state_union))
2511 full = true;
2512
2513 PFSYNC_BUCKET_UNLOCK(b);
2514
2515 return (full);
2516 }
2517
2518 static void
pfsync_delete_state(struct pf_kstate * st)2519 pfsync_delete_state(struct pf_kstate *st)
2520 {
2521 struct pfsync_softc *sc = V_pfsyncif;
2522 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
2523 bool ref = true;
2524
2525 PFSYNC_BUCKET_LOCK(b);
2526 if (st->state_flags & PFSTATE_ACK)
2527 pfsync_undefer_state_locked(st, 1);
2528 if (st->state_flags & PFSTATE_NOSYNC) {
2529 if (st->sync_state != PFSYNC_S_NONE)
2530 pfsync_q_del(st, true, b);
2531 PFSYNC_BUCKET_UNLOCK(b);
2532 return;
2533 }
2534
2535 if (b->b_len == PFSYNC_MINPKT)
2536 callout_reset(&b->b_tmo, 1 * hz, pfsync_timeout, b);
2537
2538 switch (st->sync_state) {
2539 case PFSYNC_S_INS:
2540 /* We never got to tell the world so just forget about it. */
2541 pfsync_q_del(st, true, b);
2542 break;
2543
2544 case PFSYNC_S_UPD_C:
2545 case PFSYNC_S_UPD:
2546 case PFSYNC_S_IACK:
2547 pfsync_q_del(st, false, b);
2548 ref = false;
2549 /* FALLTHROUGH */
2550
2551 case PFSYNC_S_NONE:
2552 pfsync_q_ins(st, PFSYNC_S_DEL_C, ref);
2553 break;
2554
2555 default:
2556 panic("%s: unexpected sync state %d", __func__, st->sync_state);
2557 }
2558
2559 PFSYNC_BUCKET_UNLOCK(b);
2560 }
2561
2562 static void
pfsync_clear_states(u_int32_t creatorid,const char * ifname)2563 pfsync_clear_states(u_int32_t creatorid, const char *ifname)
2564 {
2565 struct {
2566 struct pfsync_subheader subh;
2567 struct pfsync_clr clr;
2568 } __packed r;
2569
2570 bzero(&r, sizeof(r));
2571
2572 r.subh.action = PFSYNC_ACT_CLR;
2573 r.subh.count = htons(1);
2574 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_CLR]++;
2575
2576 strlcpy(r.clr.ifname, ifname, sizeof(r.clr.ifname));
2577 r.clr.creatorid = creatorid;
2578
2579 pfsync_send_plus(&r, sizeof(r));
2580 }
2581
2582 static enum pfsync_q_id
pfsync_sstate_to_qid(u_int8_t sync_state)2583 pfsync_sstate_to_qid(u_int8_t sync_state)
2584 {
2585 struct pfsync_softc *sc = V_pfsyncif;
2586
2587 switch (sync_state) {
2588 case PFSYNC_S_INS:
2589 switch (sc->sc_version) {
2590 case PFSYNC_MSG_VERSION_1301:
2591 return PFSYNC_Q_INS_1301;
2592 case PFSYNC_MSG_VERSION_1400:
2593 return PFSYNC_Q_INS_1400;
2594 case PFSYNC_MSG_VERSION_1500:
2595 return PFSYNC_Q_INS_1500;
2596 }
2597 break;
2598 case PFSYNC_S_IACK:
2599 return PFSYNC_Q_IACK;
2600 case PFSYNC_S_UPD:
2601 switch (sc->sc_version) {
2602 case PFSYNC_MSG_VERSION_1301:
2603 return PFSYNC_Q_UPD_1301;
2604 case PFSYNC_MSG_VERSION_1400:
2605 return PFSYNC_Q_UPD_1400;
2606 case PFSYNC_MSG_VERSION_1500:
2607 return PFSYNC_Q_UPD_1500;
2608 }
2609 break;
2610 case PFSYNC_S_UPD_C:
2611 return PFSYNC_Q_UPD_C;
2612 case PFSYNC_S_DEL_C:
2613 return PFSYNC_Q_DEL_C;
2614 default:
2615 panic("%s: Unsupported st->sync_state 0x%02x",
2616 __func__, sync_state);
2617 }
2618
2619 panic("%s: Unsupported pfsync_msg_version %d",
2620 __func__, sc->sc_version);
2621 }
2622
2623 static void
pfsync_q_ins(struct pf_kstate * st,int sync_state,bool ref)2624 pfsync_q_ins(struct pf_kstate *st, int sync_state, bool ref)
2625 {
2626 enum pfsync_q_id q = pfsync_sstate_to_qid(sync_state);
2627 struct pfsync_softc *sc = V_pfsyncif;
2628 size_t nlen = pfsync_qs[q].len;
2629 struct pfsync_bucket *b = pfsync_get_bucket(sc, st);
2630
2631 PFSYNC_BUCKET_LOCK_ASSERT(b);
2632
2633 KASSERT(st->sync_state == PFSYNC_S_NONE,
2634 ("%s: st->sync_state %u", __func__, st->sync_state));
2635 KASSERT(b->b_len >= PFSYNC_MINPKT, ("pfsync pkt len is too low %zu",
2636 b->b_len));
2637
2638 if (TAILQ_EMPTY(&b->b_qs[q]))
2639 nlen += sizeof(struct pfsync_subheader);
2640
2641 if (b->b_len + nlen > sc->sc_ifp->if_mtu) {
2642 pfsync_sendout(1, b->b_id);
2643
2644 nlen = sizeof(struct pfsync_subheader) + pfsync_qs[q].len;
2645 }
2646
2647 b->b_len += nlen;
2648 st->sync_state = pfsync_qid_sstate[q];
2649 TAILQ_INSERT_TAIL(&b->b_qs[q], st, sync_list);
2650 if (ref)
2651 pf_ref_state(st);
2652 }
2653
2654 static void
pfsync_q_del(struct pf_kstate * st,bool unref,struct pfsync_bucket * b)2655 pfsync_q_del(struct pf_kstate *st, bool unref, struct pfsync_bucket *b)
2656 {
2657 enum pfsync_q_id q;
2658
2659 PFSYNC_BUCKET_LOCK_ASSERT(b);
2660 KASSERT(st->sync_state != PFSYNC_S_NONE,
2661 ("%s: st->sync_state != PFSYNC_S_NONE", __func__));
2662
2663 q = pfsync_sstate_to_qid(st->sync_state);
2664 b->b_len -= pfsync_qs[q].len;
2665 TAILQ_REMOVE(&b->b_qs[q], st, sync_list);
2666 st->sync_state = PFSYNC_S_NONE;
2667 if (unref)
2668 pf_release_state(st);
2669
2670 if (TAILQ_EMPTY(&b->b_qs[q]))
2671 b->b_len -= sizeof(struct pfsync_subheader);
2672 }
2673
2674 static void
pfsync_bulk_start(void)2675 pfsync_bulk_start(void)
2676 {
2677 struct pfsync_softc *sc = V_pfsyncif;
2678
2679 if (V_pf_status.debug >= PF_DEBUG_MISC)
2680 printf("pfsync: received bulk update request\n");
2681
2682 PFSYNC_BLOCK(sc);
2683
2684 sc->sc_ureq_received = time_uptime;
2685 sc->sc_bulk_hashid = 0;
2686 sc->sc_bulk_stateid = 0;
2687 pfsync_bulk_status(PFSYNC_BUS_START);
2688 callout_reset(&sc->sc_bulk_tmo, 1, pfsync_bulk_update, sc);
2689 PFSYNC_BUNLOCK(sc);
2690 }
2691
2692 static void
pfsync_bulk_update(void * arg)2693 pfsync_bulk_update(void *arg)
2694 {
2695 struct pfsync_softc *sc = arg;
2696 struct pf_kstate *s;
2697 int i;
2698
2699 PFSYNC_BLOCK_ASSERT(sc);
2700 CURVNET_SET(sc->sc_ifp->if_vnet);
2701
2702 /*
2703 * Start with last state from previous invocation.
2704 * It may had gone, in this case start from the
2705 * hash slot.
2706 */
2707 s = pf_find_state_byid(sc->sc_bulk_stateid, sc->sc_bulk_creatorid);
2708
2709 if (s != NULL)
2710 i = PF_IDHASH(s);
2711 else
2712 i = sc->sc_bulk_hashid;
2713
2714 for (; i <= V_pf_hashmask; i++) {
2715 struct pf_idhash *ih = &V_pf_idhash[i];
2716
2717 if (s != NULL)
2718 PF_HASHROW_ASSERT(ih);
2719 else {
2720 PF_HASHROW_LOCK(ih);
2721 s = LIST_FIRST(&ih->states);
2722 }
2723
2724 for (; s; s = LIST_NEXT(s, entry)) {
2725 if (s->sync_state == PFSYNC_S_NONE &&
2726 s->timeout < PFTM_MAX &&
2727 s->pfsync_time <= sc->sc_ureq_received) {
2728 if (pfsync_update_state_req(s)) {
2729 /* We've filled a packet. */
2730 sc->sc_bulk_hashid = i;
2731 sc->sc_bulk_stateid = s->id;
2732 sc->sc_bulk_creatorid = s->creatorid;
2733 PF_HASHROW_UNLOCK(ih);
2734 callout_reset(&sc->sc_bulk_tmo, 1,
2735 pfsync_bulk_update, sc);
2736 goto full;
2737 }
2738 }
2739 }
2740 PF_HASHROW_UNLOCK(ih);
2741 }
2742
2743 /* We're done. */
2744 pfsync_bulk_status(PFSYNC_BUS_END);
2745 full:
2746 CURVNET_RESTORE();
2747 }
2748
2749 static void
pfsync_bulk_status(u_int8_t status)2750 pfsync_bulk_status(u_int8_t status)
2751 {
2752 struct {
2753 struct pfsync_subheader subh;
2754 struct pfsync_bus bus;
2755 } __packed r;
2756
2757 struct pfsync_softc *sc = V_pfsyncif;
2758
2759 bzero(&r, sizeof(r));
2760
2761 r.subh.action = PFSYNC_ACT_BUS;
2762 r.subh.count = htons(1);
2763 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_BUS]++;
2764
2765 r.bus.creatorid = V_pf_status.hostid;
2766 r.bus.endtime = htonl(time_uptime - sc->sc_ureq_received);
2767 r.bus.status = status;
2768
2769 pfsync_send_plus(&r, sizeof(r));
2770 }
2771
2772 static void
pfsync_bulk_fail(void * arg)2773 pfsync_bulk_fail(void *arg)
2774 {
2775 struct pfsync_softc *sc = arg;
2776 struct pfsync_bucket *b = &sc->sc_buckets[0];
2777
2778 CURVNET_SET(sc->sc_ifp->if_vnet);
2779
2780 PFSYNC_BLOCK_ASSERT(sc);
2781
2782 if (sc->sc_bulk_tries++ < PFSYNC_MAX_BULKTRIES) {
2783 /* Try again */
2784 callout_reset(&sc->sc_bulkfail_tmo, 5 * hz,
2785 pfsync_bulk_fail, V_pfsyncif);
2786 PFSYNC_BUCKET_LOCK(b);
2787 pfsync_request_update(0, 0);
2788 PFSYNC_BUCKET_UNLOCK(b);
2789 } else {
2790 /* Pretend like the transfer was ok. */
2791 sc->sc_ureq_sent = 0;
2792 sc->sc_bulk_tries = 0;
2793 PFSYNC_LOCK(sc);
2794 if (!(sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p)
2795 (*carp_demote_adj_p)(-V_pfsync_carp_adj,
2796 "pfsync bulk fail");
2797 sc->sc_flags |= PFSYNCF_OK;
2798 PFSYNC_UNLOCK(sc);
2799 if (V_pf_status.debug >= PF_DEBUG_MISC)
2800 printf("pfsync: failed to receive bulk update\n");
2801 }
2802
2803 CURVNET_RESTORE();
2804 }
2805
2806 static void
pfsync_send_plus(void * plus,size_t pluslen)2807 pfsync_send_plus(void *plus, size_t pluslen)
2808 {
2809 struct pfsync_softc *sc = V_pfsyncif;
2810 struct pfsync_bucket *b = &sc->sc_buckets[0];
2811 uint8_t *newplus;
2812
2813 PFSYNC_BUCKET_LOCK(b);
2814
2815 if (b->b_len + pluslen > sc->sc_ifp->if_mtu)
2816 pfsync_sendout(1, b->b_id);
2817
2818 newplus = malloc(pluslen + b->b_pluslen, M_PFSYNC, M_NOWAIT);
2819 if (newplus == NULL)
2820 goto out;
2821
2822 if (b->b_plus != NULL) {
2823 memcpy(newplus, b->b_plus, b->b_pluslen);
2824 free(b->b_plus, M_PFSYNC);
2825 } else {
2826 MPASS(b->b_pluslen == 0);
2827 }
2828 memcpy(newplus + b->b_pluslen, plus, pluslen);
2829
2830 b->b_plus = newplus;
2831 b->b_pluslen += pluslen;
2832 b->b_len += pluslen;
2833
2834 pfsync_sendout(1, b->b_id);
2835
2836 out:
2837 PFSYNC_BUCKET_UNLOCK(b);
2838 }
2839
2840 static void
pfsync_timeout(void * arg)2841 pfsync_timeout(void *arg)
2842 {
2843 struct pfsync_bucket *b = arg;
2844
2845 CURVNET_SET(b->b_sc->sc_ifp->if_vnet);
2846 PFSYNC_BUCKET_LOCK(b);
2847 pfsync_push(b);
2848 PFSYNC_BUCKET_UNLOCK(b);
2849 CURVNET_RESTORE();
2850 }
2851
2852 static void
pfsync_push(struct pfsync_bucket * b)2853 pfsync_push(struct pfsync_bucket *b)
2854 {
2855
2856 PFSYNC_BUCKET_LOCK_ASSERT(b);
2857
2858 b->b_flags |= PFSYNCF_BUCKET_PUSH;
2859 swi_sched(V_pfsync_swi_cookie, 0);
2860 }
2861
2862 static void
pfsync_push_all(struct pfsync_softc * sc)2863 pfsync_push_all(struct pfsync_softc *sc)
2864 {
2865 int c;
2866 struct pfsync_bucket *b;
2867
2868 for (c = 0; c < pfsync_buckets; c++) {
2869 b = &sc->sc_buckets[c];
2870
2871 PFSYNC_BUCKET_LOCK(b);
2872 pfsync_push(b);
2873 PFSYNC_BUCKET_UNLOCK(b);
2874 }
2875 }
2876
2877 static void
pfsync_tx(struct pfsync_softc * sc,struct mbuf * m)2878 pfsync_tx(struct pfsync_softc *sc, struct mbuf *m)
2879 {
2880 struct ip *ip;
2881 int af, error = 0;
2882
2883 ip = mtod(m, struct ip *);
2884 MPASS(ip->ip_v == IPVERSION || ip->ip_v == (IPV6_VERSION >> 4));
2885
2886 af = ip->ip_v == IPVERSION ? AF_INET : AF_INET6;
2887
2888 /*
2889 * We distinguish between a deferral packet and our
2890 * own pfsync packet based on M_SKIP_FIREWALL
2891 * flag. This is XXX.
2892 */
2893 switch (af) {
2894 #ifdef INET
2895 case AF_INET:
2896 if (m->m_flags & M_SKIP_FIREWALL) {
2897 error = ip_output(m, NULL, NULL, 0,
2898 NULL, NULL);
2899 } else {
2900 error = ip_output(m, NULL, NULL,
2901 IP_RAWOUTPUT, &sc->sc_imo, NULL);
2902 }
2903 break;
2904 #endif
2905 #ifdef INET6
2906 case AF_INET6:
2907 if (m->m_flags & M_SKIP_FIREWALL) {
2908 error = ip6_output(m, NULL, NULL, 0,
2909 NULL, NULL, NULL);
2910 } else {
2911 error = ip6_output(m, NULL, NULL, 0,
2912 &sc->sc_im6o, NULL, NULL);
2913 }
2914 break;
2915 #endif
2916 }
2917
2918 if (error == 0)
2919 V_pfsyncstats.pfsyncs_opackets++;
2920 else
2921 V_pfsyncstats.pfsyncs_oerrors++;
2922
2923 }
2924
2925 static void
pfsyncintr(void * arg)2926 pfsyncintr(void *arg)
2927 {
2928 struct epoch_tracker et;
2929 struct pfsync_softc *sc = arg;
2930 struct pfsync_bucket *b;
2931 struct mbuf *m, *n;
2932 int c;
2933
2934 NET_EPOCH_ENTER(et);
2935 CURVNET_SET(sc->sc_ifp->if_vnet);
2936
2937 for (c = 0; c < pfsync_buckets; c++) {
2938 b = &sc->sc_buckets[c];
2939
2940 PFSYNC_BUCKET_LOCK(b);
2941 if ((b->b_flags & PFSYNCF_BUCKET_PUSH) && b->b_len > PFSYNC_MINPKT) {
2942 pfsync_sendout(0, b->b_id);
2943 b->b_flags &= ~PFSYNCF_BUCKET_PUSH;
2944 }
2945 _IF_DEQUEUE_ALL(&b->b_snd, m);
2946 PFSYNC_BUCKET_UNLOCK(b);
2947
2948 for (; m != NULL; m = n) {
2949 n = m->m_nextpkt;
2950 m->m_nextpkt = NULL;
2951
2952 pfsync_tx(sc, m);
2953 }
2954 }
2955 CURVNET_RESTORE();
2956 NET_EPOCH_EXIT(et);
2957 }
2958
2959 static int
pfsync_multicast_setup(struct pfsync_softc * sc,struct ifnet * ifp,struct in_mfilter * imf,struct in6_mfilter * im6f)2960 pfsync_multicast_setup(struct pfsync_softc *sc, struct ifnet *ifp,
2961 struct in_mfilter* imf, struct in6_mfilter* im6f)
2962 {
2963 #ifdef INET
2964 struct ip_moptions *imo = &sc->sc_imo;
2965 #endif
2966 #ifdef INET6
2967 struct ip6_moptions *im6o = &sc->sc_im6o;
2968 struct sockaddr_in6 *syncpeer_sa6 = NULL;
2969 #endif
2970
2971 if (!(ifp->if_flags & IFF_MULTICAST))
2972 return (EADDRNOTAVAIL);
2973
2974 switch (sc->sc_sync_peer.ss_family) {
2975 #ifdef INET
2976 case AF_INET:
2977 {
2978 int error;
2979
2980 ip_mfilter_init(&imo->imo_head);
2981 imo->imo_multicast_vif = -1;
2982 if ((error = in_joingroup(ifp,
2983 &((struct sockaddr_in *)&sc->sc_sync_peer)->sin_addr, NULL,
2984 &imf->imf_inm)) != 0)
2985 return (error);
2986
2987 ip_mfilter_insert(&imo->imo_head, imf);
2988 imo->imo_multicast_ifp = ifp;
2989 imo->imo_multicast_ttl = PFSYNC_DFLTTL;
2990 imo->imo_multicast_loop = 0;
2991 break;
2992 }
2993 #endif
2994 #ifdef INET6
2995 case AF_INET6:
2996 {
2997 int error;
2998
2999 syncpeer_sa6 = (struct sockaddr_in6 *)&sc->sc_sync_peer;
3000 if ((error = in6_setscope(&syncpeer_sa6->sin6_addr, ifp, NULL)))
3001 return (error);
3002
3003 ip6_mfilter_init(&im6o->im6o_head);
3004 if ((error = in6_joingroup(ifp, &syncpeer_sa6->sin6_addr, NULL,
3005 &(im6f->im6f_in6m), 0)) != 0)
3006 return (error);
3007
3008 ip6_mfilter_insert(&im6o->im6o_head, im6f);
3009 im6o->im6o_multicast_ifp = ifp;
3010 im6o->im6o_multicast_hlim = PFSYNC_DFLTTL;
3011 im6o->im6o_multicast_loop = 0;
3012 break;
3013 }
3014 #endif
3015 }
3016
3017 return (0);
3018 }
3019
3020 static void
pfsync_multicast_cleanup(struct pfsync_softc * sc)3021 pfsync_multicast_cleanup(struct pfsync_softc *sc)
3022 {
3023 #ifdef INET
3024 struct ip_moptions *imo = &sc->sc_imo;
3025 struct in_mfilter *imf;
3026
3027 while ((imf = ip_mfilter_first(&imo->imo_head)) != NULL) {
3028 ip_mfilter_remove(&imo->imo_head, imf);
3029 in_leavegroup(imf->imf_inm, NULL);
3030 ip_mfilter_free(imf);
3031 }
3032 imo->imo_multicast_ifp = NULL;
3033 #endif
3034
3035 #ifdef INET6
3036 struct ip6_moptions *im6o = &sc->sc_im6o;
3037 struct in6_mfilter *im6f;
3038
3039 while ((im6f = ip6_mfilter_first(&im6o->im6o_head)) != NULL) {
3040 ip6_mfilter_remove(&im6o->im6o_head, im6f);
3041 in6_leavegroup(im6f->im6f_in6m, NULL);
3042 ip6_mfilter_free(im6f);
3043 }
3044 im6o->im6o_multicast_ifp = NULL;
3045 #endif
3046 }
3047
3048 void
pfsync_detach_ifnet(struct ifnet * ifp)3049 pfsync_detach_ifnet(struct ifnet *ifp)
3050 {
3051 struct pfsync_softc *sc = V_pfsyncif;
3052
3053 if (sc == NULL)
3054 return;
3055
3056 PFSYNC_LOCK(sc);
3057
3058 if (sc->sc_sync_if == ifp) {
3059 /* We don't need mutlicast cleanup here, because the interface
3060 * is going away. We do need to ensure we don't try to do
3061 * cleanup later.
3062 */
3063 ip_mfilter_init(&sc->sc_imo.imo_head);
3064 sc->sc_imo.imo_multicast_ifp = NULL;
3065 sc->sc_im6o.im6o_multicast_ifp = NULL;
3066 sc->sc_sync_if = NULL;
3067 }
3068
3069 PFSYNC_UNLOCK(sc);
3070 }
3071
3072 static int
pfsync_pfsyncreq_to_kstatus(struct pfsyncreq * pfsyncr,struct pfsync_kstatus * status)3073 pfsync_pfsyncreq_to_kstatus(struct pfsyncreq *pfsyncr, struct pfsync_kstatus *status)
3074 {
3075 struct sockaddr_storage sa;
3076 status->maxupdates = pfsyncr->pfsyncr_maxupdates;
3077 status->flags = pfsyncr->pfsyncr_defer;
3078
3079 strlcpy(status->syncdev, pfsyncr->pfsyncr_syncdev, IFNAMSIZ);
3080
3081 memset(&sa, 0, sizeof(sa));
3082 if (pfsyncr->pfsyncr_syncpeer.s_addr != 0) {
3083 struct sockaddr_in *in = (struct sockaddr_in *)&sa;
3084 in->sin_family = AF_INET;
3085 in->sin_len = sizeof(*in);
3086 in->sin_addr.s_addr = pfsyncr->pfsyncr_syncpeer.s_addr;
3087 }
3088 status->syncpeer = sa;
3089
3090 return 0;
3091 }
3092
3093 static int
pfsync_kstatus_to_softc(struct pfsync_kstatus * status,struct pfsync_softc * sc)3094 pfsync_kstatus_to_softc(struct pfsync_kstatus *status, struct pfsync_softc *sc)
3095 {
3096 struct ifnet *sifp;
3097 struct in_mfilter *imf = NULL;
3098 struct in6_mfilter *im6f = NULL;
3099 int error;
3100 int c;
3101
3102 if ((status->maxupdates < 0) || (status->maxupdates > 255))
3103 return (EINVAL);
3104
3105 if (status->syncdev[0] == '\0')
3106 sifp = NULL;
3107 else if ((sifp = ifunit_ref(status->syncdev)) == NULL)
3108 return (EINVAL);
3109
3110 switch (status->syncpeer.ss_family) {
3111 #ifdef INET
3112 case AF_UNSPEC:
3113 case AF_INET: {
3114 struct sockaddr_in *status_sin;
3115 status_sin = (struct sockaddr_in *)&(status->syncpeer);
3116 if (sifp != NULL) {
3117 if (status_sin->sin_addr.s_addr == 0 ||
3118 status_sin->sin_addr.s_addr ==
3119 htonl(INADDR_PFSYNC_GROUP)) {
3120 status_sin->sin_family = AF_INET;
3121 status_sin->sin_len = sizeof(*status_sin);
3122 status_sin->sin_addr.s_addr =
3123 htonl(INADDR_PFSYNC_GROUP);
3124 }
3125
3126 if (IN_MULTICAST(ntohl(status_sin->sin_addr.s_addr))) {
3127 imf = ip_mfilter_alloc(M_WAITOK, 0, 0);
3128 }
3129 }
3130 break;
3131 }
3132 #endif
3133 #ifdef INET6
3134 case AF_INET6: {
3135 struct sockaddr_in6 *status_sin6;
3136 status_sin6 = (struct sockaddr_in6*)&(status->syncpeer);
3137 if (sifp != NULL) {
3138 if (IN6_IS_ADDR_UNSPECIFIED(&status_sin6->sin6_addr) ||
3139 IN6_ARE_ADDR_EQUAL(&status_sin6->sin6_addr,
3140 &in6addr_linklocal_pfsync_group)) {
3141 status_sin6->sin6_family = AF_INET6;
3142 status_sin6->sin6_len = sizeof(*status_sin6);
3143 status_sin6->sin6_addr =
3144 in6addr_linklocal_pfsync_group;
3145 }
3146
3147 if (IN6_IS_ADDR_MULTICAST(&status_sin6->sin6_addr)) {
3148 im6f = ip6_mfilter_alloc(M_WAITOK, 0, 0);
3149 }
3150 }
3151 break;
3152 }
3153 #endif
3154 }
3155
3156 PFSYNC_LOCK(sc);
3157
3158 switch (status->version) {
3159 case PFSYNC_MSG_VERSION_UNSPECIFIED:
3160 sc->sc_version = PFSYNC_MSG_VERSION_DEFAULT;
3161 break;
3162 case PFSYNC_MSG_VERSION_1301:
3163 case PFSYNC_MSG_VERSION_1400:
3164 case PFSYNC_MSG_VERSION_1500:
3165 sc->sc_version = status->version;
3166 break;
3167 default:
3168 PFSYNC_UNLOCK(sc);
3169 return (EINVAL);
3170 }
3171
3172 switch (status->syncpeer.ss_family) {
3173 case AF_INET: {
3174 struct sockaddr_in *status_sin = (struct sockaddr_in *)&(status->syncpeer);
3175 struct sockaddr_in *sc_sin = (struct sockaddr_in *)&sc->sc_sync_peer;
3176 sc_sin->sin_family = AF_INET;
3177 sc_sin->sin_len = sizeof(*sc_sin);
3178 if (status_sin->sin_addr.s_addr == 0) {
3179 sc_sin->sin_addr.s_addr = htonl(INADDR_PFSYNC_GROUP);
3180 } else {
3181 sc_sin->sin_addr.s_addr = status_sin->sin_addr.s_addr;
3182 }
3183 break;
3184 }
3185 case AF_INET6: {
3186 struct sockaddr_in6 *status_sin = (struct sockaddr_in6 *)&(status->syncpeer);
3187 struct sockaddr_in6 *sc_sin = (struct sockaddr_in6 *)&sc->sc_sync_peer;
3188 sc_sin->sin6_family = AF_INET6;
3189 sc_sin->sin6_len = sizeof(*sc_sin);
3190 if(IN6_IS_ADDR_UNSPECIFIED(&status_sin->sin6_addr)) {
3191 sc_sin->sin6_addr = in6addr_linklocal_pfsync_group;
3192 } else {
3193 sc_sin->sin6_addr = status_sin->sin6_addr;
3194 }
3195 break;
3196 }
3197 }
3198
3199 sc->sc_maxupdates = status->maxupdates;
3200 if (status->flags & PFSYNCF_DEFER) {
3201 sc->sc_flags |= PFSYNCF_DEFER;
3202 V_pfsync_defer_ptr = pfsync_defer;
3203 } else {
3204 sc->sc_flags &= ~PFSYNCF_DEFER;
3205 V_pfsync_defer_ptr = NULL;
3206 }
3207
3208 if (sifp == NULL) {
3209 if (sc->sc_sync_if)
3210 if_rele(sc->sc_sync_if);
3211 sc->sc_sync_if = NULL;
3212 pfsync_multicast_cleanup(sc);
3213 PFSYNC_UNLOCK(sc);
3214 return (0);
3215 }
3216
3217 for (c = 0; c < pfsync_buckets; c++) {
3218 PFSYNC_BUCKET_LOCK(&sc->sc_buckets[c]);
3219 if (sc->sc_buckets[c].b_len > PFSYNC_MINPKT &&
3220 (sifp->if_mtu < sc->sc_ifp->if_mtu ||
3221 (sc->sc_sync_if != NULL &&
3222 sifp->if_mtu < sc->sc_sync_if->if_mtu) ||
3223 sifp->if_mtu < MCLBYTES - sizeof(struct ip)))
3224 pfsync_sendout(1, c);
3225 PFSYNC_BUCKET_UNLOCK(&sc->sc_buckets[c]);
3226 }
3227
3228 pfsync_multicast_cleanup(sc);
3229
3230 if (((sc->sc_sync_peer.ss_family == AF_INET) &&
3231 IN_MULTICAST(ntohl(((struct sockaddr_in *)
3232 &sc->sc_sync_peer)->sin_addr.s_addr))) ||
3233 ((sc->sc_sync_peer.ss_family == AF_INET6) &&
3234 IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6*)
3235 &sc->sc_sync_peer)->sin6_addr))) {
3236 error = pfsync_multicast_setup(sc, sifp, imf, im6f);
3237 if (error) {
3238 if_rele(sifp);
3239 PFSYNC_UNLOCK(sc);
3240 #ifdef INET
3241 if (imf != NULL)
3242 ip_mfilter_free(imf);
3243 #endif
3244 #ifdef INET6
3245 if (im6f != NULL)
3246 ip6_mfilter_free(im6f);
3247 #endif
3248 return (error);
3249 }
3250 }
3251 if (sc->sc_sync_if)
3252 if_rele(sc->sc_sync_if);
3253 sc->sc_sync_if = sifp;
3254
3255 switch (sc->sc_sync_peer.ss_family) {
3256 #ifdef INET
3257 case AF_INET: {
3258 struct ip *ip;
3259 ip = &sc->sc_template.ipv4;
3260 bzero(ip, sizeof(*ip));
3261 ip->ip_v = IPVERSION;
3262 ip->ip_hl = sizeof(sc->sc_template.ipv4) >> 2;
3263 ip->ip_tos = IPTOS_LOWDELAY;
3264 /* len and id are set later. */
3265 ip->ip_off = htons(IP_DF);
3266 ip->ip_ttl = PFSYNC_DFLTTL;
3267 ip->ip_p = IPPROTO_PFSYNC;
3268 ip->ip_src.s_addr = INADDR_ANY;
3269 ip->ip_dst = ((struct sockaddr_in *)&sc->sc_sync_peer)->sin_addr;
3270 break;
3271 }
3272 #endif
3273 #ifdef INET6
3274 case AF_INET6: {
3275 struct ip6_hdr *ip6;
3276 ip6 = &sc->sc_template.ipv6;
3277 bzero(ip6, sizeof(*ip6));
3278 ip6->ip6_vfc = IPV6_VERSION;
3279 ip6->ip6_hlim = PFSYNC_DFLTTL;
3280 ip6->ip6_nxt = IPPROTO_PFSYNC;
3281 ip6->ip6_dst = ((struct sockaddr_in6 *)&sc->sc_sync_peer)->sin6_addr;
3282
3283 struct epoch_tracker et;
3284 NET_EPOCH_ENTER(et);
3285 in6_selectsrc_addr(if_getfib(sc->sc_sync_if), &ip6->ip6_dst, 0,
3286 sc->sc_sync_if, &ip6->ip6_src, NULL);
3287 NET_EPOCH_EXIT(et);
3288 break;
3289 }
3290 #endif
3291 }
3292
3293 /* Request a full state table update. */
3294 if ((sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p)
3295 (*carp_demote_adj_p)(V_pfsync_carp_adj,
3296 "pfsync bulk start");
3297 sc->sc_flags &= ~PFSYNCF_OK;
3298 if (V_pf_status.debug >= PF_DEBUG_MISC)
3299 printf("pfsync: requesting bulk update\n");
3300 PFSYNC_UNLOCK(sc);
3301 PFSYNC_BUCKET_LOCK(&sc->sc_buckets[0]);
3302 pfsync_request_update(0, 0);
3303 PFSYNC_BUCKET_UNLOCK(&sc->sc_buckets[0]);
3304 PFSYNC_BLOCK(sc);
3305 sc->sc_ureq_sent = time_uptime;
3306 callout_reset(&sc->sc_bulkfail_tmo, 5 * hz, pfsync_bulk_fail, sc);
3307 PFSYNC_BUNLOCK(sc);
3308 return (0);
3309 }
3310
3311 static void
pfsync_pointers_init(void)3312 pfsync_pointers_init(void)
3313 {
3314
3315 PF_RULES_WLOCK();
3316 V_pfsync_state_import_ptr = pfsync_state_import;
3317 V_pfsync_insert_state_ptr = pfsync_insert_state;
3318 V_pfsync_update_state_ptr = pfsync_update_state;
3319 V_pfsync_delete_state_ptr = pfsync_delete_state;
3320 V_pfsync_clear_states_ptr = pfsync_clear_states;
3321 V_pfsync_defer_ptr = pfsync_defer;
3322 PF_RULES_WUNLOCK();
3323 }
3324
3325 static void
pfsync_pointers_uninit(void)3326 pfsync_pointers_uninit(void)
3327 {
3328
3329 PF_RULES_WLOCK();
3330 V_pfsync_state_import_ptr = NULL;
3331 V_pfsync_insert_state_ptr = NULL;
3332 V_pfsync_update_state_ptr = NULL;
3333 V_pfsync_delete_state_ptr = NULL;
3334 V_pfsync_clear_states_ptr = NULL;
3335 V_pfsync_defer_ptr = NULL;
3336 PF_RULES_WUNLOCK();
3337 }
3338
3339 static void
vnet_pfsync_init(const void * unused __unused)3340 vnet_pfsync_init(const void *unused __unused)
3341 {
3342 int error;
3343
3344 V_pfsync_cloner = if_clone_simple(pfsyncname,
3345 pfsync_clone_create, pfsync_clone_destroy, 1);
3346 error = swi_add(&V_pfsync_swi_ie, pfsyncname, pfsyncintr, V_pfsyncif,
3347 SWI_NET, INTR_MPSAFE, &V_pfsync_swi_cookie);
3348 if (error) {
3349 if_clone_detach(V_pfsync_cloner);
3350 log(LOG_INFO, "swi_add() failed in %s\n", __func__);
3351 }
3352
3353 pfsync_pointers_init();
3354 }
3355 VNET_SYSINIT(vnet_pfsync_init, SI_SUB_PROTO_FIREWALL, SI_ORDER_ANY,
3356 vnet_pfsync_init, NULL);
3357
3358 static void
vnet_pfsync_uninit(const void * unused __unused)3359 vnet_pfsync_uninit(const void *unused __unused)
3360 {
3361 int ret __diagused;
3362
3363 pfsync_pointers_uninit();
3364
3365 if_clone_detach(V_pfsync_cloner);
3366 ret = swi_remove(V_pfsync_swi_cookie);
3367 MPASS(ret == 0);
3368 ret = intr_event_destroy(V_pfsync_swi_ie);
3369 MPASS(ret == 0);
3370 }
3371
3372 VNET_SYSUNINIT(vnet_pfsync_uninit, SI_SUB_PROTO_FIREWALL, SI_ORDER_FOURTH,
3373 vnet_pfsync_uninit, NULL);
3374
3375 static int
pfsync_init(void)3376 pfsync_init(void)
3377 {
3378 int error;
3379
3380 pfsync_detach_ifnet_ptr = pfsync_detach_ifnet;
3381
3382 #ifdef INET
3383 error = ipproto_register(IPPROTO_PFSYNC, pfsync_input, NULL);
3384 if (error)
3385 return (error);
3386 #endif
3387 #ifdef INET6
3388 error = ip6proto_register(IPPROTO_PFSYNC, pfsync6_input, NULL);
3389 if (error) {
3390 ipproto_unregister(IPPROTO_PFSYNC);
3391 return (error);
3392 }
3393 #endif
3394
3395 return (0);
3396 }
3397
3398 static void
pfsync_uninit(void)3399 pfsync_uninit(void)
3400 {
3401 pfsync_detach_ifnet_ptr = NULL;
3402
3403 #ifdef INET
3404 ipproto_unregister(IPPROTO_PFSYNC);
3405 #endif
3406 #ifdef INET6
3407 ip6proto_unregister(IPPROTO_PFSYNC);
3408 #endif
3409 }
3410
3411 static int
pfsync_modevent(module_t mod,int type,void * data)3412 pfsync_modevent(module_t mod, int type, void *data)
3413 {
3414 int error = 0;
3415
3416 switch (type) {
3417 case MOD_LOAD:
3418 error = pfsync_init();
3419 break;
3420 case MOD_UNLOAD:
3421 pfsync_uninit();
3422 break;
3423 default:
3424 error = EINVAL;
3425 break;
3426 }
3427
3428 return (error);
3429 }
3430
3431 static moduledata_t pfsync_mod = {
3432 pfsyncname,
3433 pfsync_modevent,
3434 0
3435 };
3436
3437 #define PFSYNC_MODVER 1
3438
3439 /* Stay on FIREWALL as we depend on pf being initialized and on inetdomain. */
3440 DECLARE_MODULE(pfsync, pfsync_mod, SI_SUB_PROTO_FIREWALL, SI_ORDER_ANY);
3441 MODULE_VERSION(pfsync, PFSYNC_MODVER);
3442 MODULE_DEPEND(pfsync, pf, PF_MODVER, PF_MODVER, PF_MODVER);
3443