62
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/priv.h>
77#include <sys/protosw.h>
78#include <sys/socket.h>
79#include <sys/sockio.h>
80#include <sys/sysctl.h>
81
82#include <net/bpf.h>
83#include <net/if.h>
84#include <net/if_var.h>
85#include <net/if_clone.h>
86#include <net/if_types.h>
87#include <net/vnet.h>
88#include <net/pfvar.h>
89#include <net/if_pfsync.h>
90
91#include <netinet/if_ether.h>
92#include <netinet/in.h>
93#include <netinet/in_var.h>
94#include <netinet/ip.h>
95#include <netinet/ip_carp.h>
96#include <netinet/ip_var.h>
97#include <netinet/tcp.h>
98#include <netinet/tcp_fsm.h>
99#include <netinet/tcp_seq.h>
100
101#define PFSYNC_MINPKT ( \
102 sizeof(struct ip) + \
103 sizeof(struct pfsync_header) + \
104 sizeof(struct pfsync_subheader) )
105
106struct pfsync_pkt {
107 struct ip *ip;
108 struct in_addr src;
109 u_int8_t flags;
110};
111
112static int pfsync_upd_tcp(struct pf_state *, struct pfsync_state_peer *,
113 struct pfsync_state_peer *);
114static int pfsync_in_clr(struct pfsync_pkt *, struct mbuf *, int, int);
115static int pfsync_in_ins(struct pfsync_pkt *, struct mbuf *, int, int);
116static int pfsync_in_iack(struct pfsync_pkt *, struct mbuf *, int, int);
117static int pfsync_in_upd(struct pfsync_pkt *, struct mbuf *, int, int);
118static int pfsync_in_upd_c(struct pfsync_pkt *, struct mbuf *, int, int);
119static int pfsync_in_ureq(struct pfsync_pkt *, struct mbuf *, int, int);
120static int pfsync_in_del(struct pfsync_pkt *, struct mbuf *, int, int);
121static int pfsync_in_del_c(struct pfsync_pkt *, struct mbuf *, int, int);
122static int pfsync_in_bus(struct pfsync_pkt *, struct mbuf *, int, int);
123static int pfsync_in_tdb(struct pfsync_pkt *, struct mbuf *, int, int);
124static int pfsync_in_eof(struct pfsync_pkt *, struct mbuf *, int, int);
125static int pfsync_in_error(struct pfsync_pkt *, struct mbuf *, int, int);
126
127static int (*pfsync_acts[])(struct pfsync_pkt *, struct mbuf *, int, int) = {
128 pfsync_in_clr, /* PFSYNC_ACT_CLR */
129 pfsync_in_ins, /* PFSYNC_ACT_INS */
130 pfsync_in_iack, /* PFSYNC_ACT_INS_ACK */
131 pfsync_in_upd, /* PFSYNC_ACT_UPD */
132 pfsync_in_upd_c, /* PFSYNC_ACT_UPD_C */
133 pfsync_in_ureq, /* PFSYNC_ACT_UPD_REQ */
134 pfsync_in_del, /* PFSYNC_ACT_DEL */
135 pfsync_in_del_c, /* PFSYNC_ACT_DEL_C */
136 pfsync_in_error, /* PFSYNC_ACT_INS_F */
137 pfsync_in_error, /* PFSYNC_ACT_DEL_F */
138 pfsync_in_bus, /* PFSYNC_ACT_BUS */
139 pfsync_in_tdb, /* PFSYNC_ACT_TDB */
140 pfsync_in_eof /* PFSYNC_ACT_EOF */
141};
142
143struct pfsync_q {
144 void (*write)(struct pf_state *, void *);
145 size_t len;
146 u_int8_t action;
147};
148
149/* we have one of these for every PFSYNC_S_ */
150static void pfsync_out_state(struct pf_state *, void *);
151static void pfsync_out_iack(struct pf_state *, void *);
152static void pfsync_out_upd_c(struct pf_state *, void *);
153static void pfsync_out_del(struct pf_state *, void *);
154
155static struct pfsync_q pfsync_qs[] = {
156 { pfsync_out_state, sizeof(struct pfsync_state), PFSYNC_ACT_INS },
157 { pfsync_out_iack, sizeof(struct pfsync_ins_ack), PFSYNC_ACT_INS_ACK },
158 { pfsync_out_state, sizeof(struct pfsync_state), PFSYNC_ACT_UPD },
159 { pfsync_out_upd_c, sizeof(struct pfsync_upd_c), PFSYNC_ACT_UPD_C },
160 { pfsync_out_del, sizeof(struct pfsync_del_c), PFSYNC_ACT_DEL_C }
161};
162
163static void pfsync_q_ins(struct pf_state *, int);
164static void pfsync_q_del(struct pf_state *);
165
166static void pfsync_update_state(struct pf_state *);
167
168struct pfsync_upd_req_item {
169 TAILQ_ENTRY(pfsync_upd_req_item) ur_entry;
170 struct pfsync_upd_req ur_msg;
171};
172
173struct pfsync_deferral {
174 struct pfsync_softc *pd_sc;
175 TAILQ_ENTRY(pfsync_deferral) pd_entry;
176 u_int pd_refs;
177 struct callout pd_tmo;
178
179 struct pf_state *pd_st;
180 struct mbuf *pd_m;
181};
182
183struct pfsync_softc {
184 /* Configuration */
185 struct ifnet *sc_ifp;
186 struct ifnet *sc_sync_if;
187 struct ip_moptions sc_imo;
188 struct in_addr sc_sync_peer;
189 uint32_t sc_flags;
190#define PFSYNCF_OK 0x00000001
191#define PFSYNCF_DEFER 0x00000002
192#define PFSYNCF_PUSH 0x00000004
193 uint8_t sc_maxupdates;
194 struct ip sc_template;
195 struct callout sc_tmo;
196 struct mtx sc_mtx;
197
198 /* Queued data */
199 size_t sc_len;
200 TAILQ_HEAD(, pf_state) sc_qs[PFSYNC_S_COUNT];
201 TAILQ_HEAD(, pfsync_upd_req_item) sc_upd_req_list;
202 TAILQ_HEAD(, pfsync_deferral) sc_deferrals;
203 u_int sc_deferred;
204 void *sc_plus;
205 size_t sc_pluslen;
206
207 /* Bulk update info */
208 struct mtx sc_bulk_mtx;
209 uint32_t sc_ureq_sent;
210 int sc_bulk_tries;
211 uint32_t sc_ureq_received;
212 int sc_bulk_hashid;
213 uint64_t sc_bulk_stateid;
214 uint32_t sc_bulk_creatorid;
215 struct callout sc_bulk_tmo;
216 struct callout sc_bulkfail_tmo;
217};
218
219#define PFSYNC_LOCK(sc) mtx_lock(&(sc)->sc_mtx)
220#define PFSYNC_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx)
221#define PFSYNC_LOCK_ASSERT(sc) mtx_assert(&(sc)->sc_mtx, MA_OWNED)
222
223#define PFSYNC_BLOCK(sc) mtx_lock(&(sc)->sc_bulk_mtx)
224#define PFSYNC_BUNLOCK(sc) mtx_unlock(&(sc)->sc_bulk_mtx)
225#define PFSYNC_BLOCK_ASSERT(sc) mtx_assert(&(sc)->sc_bulk_mtx, MA_OWNED)
226
227static const char pfsyncname[] = "pfsync";
228static MALLOC_DEFINE(M_PFSYNC, pfsyncname, "pfsync(4) data");
229static VNET_DEFINE(struct pfsync_softc *, pfsyncif) = NULL;
230#define V_pfsyncif VNET(pfsyncif)
231static VNET_DEFINE(void *, pfsync_swi_cookie) = NULL;
232#define V_pfsync_swi_cookie VNET(pfsync_swi_cookie)
233static VNET_DEFINE(struct pfsyncstats, pfsyncstats);
234#define V_pfsyncstats VNET(pfsyncstats)
235static VNET_DEFINE(int, pfsync_carp_adj) = CARP_MAXSKEW;
236#define V_pfsync_carp_adj VNET(pfsync_carp_adj)
237
238static void pfsync_timeout(void *);
239static void pfsync_push(struct pfsync_softc *);
240static void pfsyncintr(void *);
241static int pfsync_multicast_setup(struct pfsync_softc *, struct ifnet *,
242 void *);
243static void pfsync_multicast_cleanup(struct pfsync_softc *);
244static void pfsync_pointers_init(void);
245static void pfsync_pointers_uninit(void);
246static int pfsync_init(void);
247static void pfsync_uninit(void);
248
249SYSCTL_NODE(_net, OID_AUTO, pfsync, CTLFLAG_RW, 0, "PFSYNC");
250SYSCTL_VNET_STRUCT(_net_pfsync, OID_AUTO, stats, CTLFLAG_RW,
251 &VNET_NAME(pfsyncstats), pfsyncstats,
252 "PFSYNC statistics (struct pfsyncstats, net/if_pfsync.h)");
253SYSCTL_INT(_net_pfsync, OID_AUTO, carp_demotion_factor, CTLFLAG_RW,
254 &VNET_NAME(pfsync_carp_adj), 0, "pfsync's CARP demotion factor adjustment");
255
256static int pfsync_clone_create(struct if_clone *, int, caddr_t);
257static void pfsync_clone_destroy(struct ifnet *);
258static int pfsync_alloc_scrub_memory(struct pfsync_state_peer *,
259 struct pf_state_peer *);
260static int pfsyncoutput(struct ifnet *, struct mbuf *,
261 const struct sockaddr *, struct route *);
262static int pfsyncioctl(struct ifnet *, u_long, caddr_t);
263
264static int pfsync_defer(struct pf_state *, struct mbuf *);
265static void pfsync_undefer(struct pfsync_deferral *, int);
266static void pfsync_undefer_state(struct pf_state *, int);
267static void pfsync_defer_tmo(void *);
268
269static void pfsync_request_update(u_int32_t, u_int64_t);
270static void pfsync_update_state_req(struct pf_state *);
271
272static void pfsync_drop(struct pfsync_softc *);
273static void pfsync_sendout(int);
274static void pfsync_send_plus(void *, size_t);
275
276static void pfsync_bulk_start(void);
277static void pfsync_bulk_status(u_int8_t);
278static void pfsync_bulk_update(void *);
279static void pfsync_bulk_fail(void *);
280
281#ifdef IPSEC
282static void pfsync_update_net_tdb(struct pfsync_tdb *);
283#endif
284
285#define PFSYNC_MAX_BULKTRIES 12
286
287VNET_DEFINE(struct if_clone *, pfsync_cloner);
288#define V_pfsync_cloner VNET(pfsync_cloner)
289
290static int
291pfsync_clone_create(struct if_clone *ifc, int unit, caddr_t param)
292{
293 struct pfsync_softc *sc;
294 struct ifnet *ifp;
295 int q;
296
297 if (unit != 0)
298 return (EINVAL);
299
300 sc = malloc(sizeof(struct pfsync_softc), M_PFSYNC, M_WAITOK | M_ZERO);
301 sc->sc_flags |= PFSYNCF_OK;
302
303 for (q = 0; q < PFSYNC_S_COUNT; q++)
304 TAILQ_INIT(&sc->sc_qs[q]);
305
306 TAILQ_INIT(&sc->sc_upd_req_list);
307 TAILQ_INIT(&sc->sc_deferrals);
308
309 sc->sc_len = PFSYNC_MINPKT;
310 sc->sc_maxupdates = 128;
311
312 ifp = sc->sc_ifp = if_alloc(IFT_PFSYNC);
313 if (ifp == NULL) {
314 free(sc, M_PFSYNC);
315 return (ENOSPC);
316 }
317 if_initname(ifp, pfsyncname, unit);
318 ifp->if_softc = sc;
319 ifp->if_ioctl = pfsyncioctl;
320 ifp->if_output = pfsyncoutput;
321 ifp->if_type = IFT_PFSYNC;
322 ifp->if_snd.ifq_maxlen = ifqmaxlen;
323 ifp->if_hdrlen = sizeof(struct pfsync_header);
324 ifp->if_mtu = ETHERMTU;
325 mtx_init(&sc->sc_mtx, pfsyncname, NULL, MTX_DEF);
326 mtx_init(&sc->sc_bulk_mtx, "pfsync bulk", NULL, MTX_DEF);
327 callout_init(&sc->sc_tmo, CALLOUT_MPSAFE);
328 callout_init_mtx(&sc->sc_bulk_tmo, &sc->sc_bulk_mtx, 0);
329 callout_init_mtx(&sc->sc_bulkfail_tmo, &sc->sc_bulk_mtx, 0);
330
331 if_attach(ifp);
332
333 bpfattach(ifp, DLT_PFSYNC, PFSYNC_HDRLEN);
334
335 V_pfsyncif = sc;
336
337 return (0);
338}
339
340static void
341pfsync_clone_destroy(struct ifnet *ifp)
342{
343 struct pfsync_softc *sc = ifp->if_softc;
344
345 /*
346 * At this stage, everything should have already been
347 * cleared by pfsync_uninit(), and we have only to
348 * drain callouts.
349 */
350 while (sc->sc_deferred > 0) {
351 struct pfsync_deferral *pd = TAILQ_FIRST(&sc->sc_deferrals);
352
353 TAILQ_REMOVE(&sc->sc_deferrals, pd, pd_entry);
354 sc->sc_deferred--;
355 if (callout_stop(&pd->pd_tmo)) {
356 pf_release_state(pd->pd_st);
357 m_freem(pd->pd_m);
358 free(pd, M_PFSYNC);
359 } else {
360 pd->pd_refs++;
361 callout_drain(&pd->pd_tmo);
362 free(pd, M_PFSYNC);
363 }
364 }
365
366 callout_drain(&sc->sc_tmo);
367 callout_drain(&sc->sc_bulkfail_tmo);
368 callout_drain(&sc->sc_bulk_tmo);
369
370 if (!(sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p)
371 (*carp_demote_adj_p)(-V_pfsync_carp_adj, "pfsync destroy");
372 bpfdetach(ifp);
373 if_detach(ifp);
374
375 pfsync_drop(sc);
376
377 if_free(ifp);
378 if (sc->sc_imo.imo_membership)
379 pfsync_multicast_cleanup(sc);
380 mtx_destroy(&sc->sc_mtx);
381 mtx_destroy(&sc->sc_bulk_mtx);
382 free(sc, M_PFSYNC);
383
384 V_pfsyncif = NULL;
385}
386
387static int
388pfsync_alloc_scrub_memory(struct pfsync_state_peer *s,
389 struct pf_state_peer *d)
390{
391 if (s->scrub.scrub_flag && d->scrub == NULL) {
392 d->scrub = uma_zalloc(V_pf_state_scrub_z, M_NOWAIT | M_ZERO);
393 if (d->scrub == NULL)
394 return (ENOMEM);
395 }
396
397 return (0);
398}
399
400
401static int
402pfsync_state_import(struct pfsync_state *sp, u_int8_t flags)
403{
404 struct pfsync_softc *sc = V_pfsyncif;
405#ifndef __NO_STRICT_ALIGNMENT
406 struct pfsync_state_key key[2];
407#endif
408 struct pfsync_state_key *kw, *ks;
409 struct pf_state *st = NULL;
410 struct pf_state_key *skw = NULL, *sks = NULL;
411 struct pf_rule *r = NULL;
412 struct pfi_kif *kif;
413 int error;
414
415 PF_RULES_RASSERT();
416
417 if (sp->creatorid == 0) {
418 if (V_pf_status.debug >= PF_DEBUG_MISC)
419 printf("%s: invalid creator id: %08x\n", __func__,
420 ntohl(sp->creatorid));
421 return (EINVAL);
422 }
423
424 if ((kif = pfi_kif_find(sp->ifname)) == NULL) {
425 if (V_pf_status.debug >= PF_DEBUG_MISC)
426 printf("%s: unknown interface: %s\n", __func__,
427 sp->ifname);
428 if (flags & PFSYNC_SI_IOCTL)
429 return (EINVAL);
430 return (0); /* skip this state */
431 }
432
433 /*
434 * If the ruleset checksums match or the state is coming from the ioctl,
435 * it's safe to associate the state with the rule of that number.
436 */
437 if (sp->rule != htonl(-1) && sp->anchor == htonl(-1) &&
438 (flags & (PFSYNC_SI_IOCTL | PFSYNC_SI_CKSUM)) && ntohl(sp->rule) <
439 pf_main_ruleset.rules[PF_RULESET_FILTER].active.rcount)
440 r = pf_main_ruleset.rules[
441 PF_RULESET_FILTER].active.ptr_array[ntohl(sp->rule)];
442 else
443 r = &V_pf_default_rule;
444
445 if ((r->max_states &&
446 counter_u64_fetch(r->states_cur) >= r->max_states))
447 goto cleanup;
448
449 /*
450 * XXXGL: consider M_WAITOK in ioctl path after.
451 */
452 if ((st = uma_zalloc(V_pf_state_z, M_NOWAIT | M_ZERO)) == NULL)
453 goto cleanup;
454
455 if ((skw = uma_zalloc(V_pf_state_key_z, M_NOWAIT)) == NULL)
456 goto cleanup;
457
458#ifndef __NO_STRICT_ALIGNMENT
459 bcopy(&sp->key, key, sizeof(struct pfsync_state_key) * 2);
460 kw = &key[PF_SK_WIRE];
461 ks = &key[PF_SK_STACK];
462#else
463 kw = &sp->key[PF_SK_WIRE];
464 ks = &sp->key[PF_SK_STACK];
465#endif
466
467 if (PF_ANEQ(&kw->addr[0], &ks->addr[0], sp->af) ||
468 PF_ANEQ(&kw->addr[1], &ks->addr[1], sp->af) ||
469 kw->port[0] != ks->port[0] ||
470 kw->port[1] != ks->port[1]) {
471 sks = uma_zalloc(V_pf_state_key_z, M_NOWAIT);
472 if (sks == NULL)
473 goto cleanup;
474 } else
475 sks = skw;
476
477 /* allocate memory for scrub info */
478 if (pfsync_alloc_scrub_memory(&sp->src, &st->src) ||
479 pfsync_alloc_scrub_memory(&sp->dst, &st->dst))
480 goto cleanup;
481
482 /* Copy to state key(s). */
483 skw->addr[0] = kw->addr[0];
484 skw->addr[1] = kw->addr[1];
485 skw->port[0] = kw->port[0];
486 skw->port[1] = kw->port[1];
487 skw->proto = sp->proto;
488 skw->af = sp->af;
489 if (sks != skw) {
490 sks->addr[0] = ks->addr[0];
491 sks->addr[1] = ks->addr[1];
492 sks->port[0] = ks->port[0];
493 sks->port[1] = ks->port[1];
494 sks->proto = sp->proto;
495 sks->af = sp->af;
496 }
497
498 /* copy to state */
499 bcopy(&sp->rt_addr, &st->rt_addr, sizeof(st->rt_addr));
500 st->creation = time_uptime - ntohl(sp->creation);
501 st->expire = time_uptime;
502 if (sp->expire) {
503 uint32_t timeout;
504
505 timeout = r->timeout[sp->timeout];
506 if (!timeout)
507 timeout = V_pf_default_rule.timeout[sp->timeout];
508
509 /* sp->expire may have been adaptively scaled by export. */
510 st->expire -= timeout - ntohl(sp->expire);
511 }
512
513 st->direction = sp->direction;
514 st->log = sp->log;
515 st->timeout = sp->timeout;
516 st->state_flags = sp->state_flags;
517
518 st->id = sp->id;
519 st->creatorid = sp->creatorid;
520 pf_state_peer_ntoh(&sp->src, &st->src);
521 pf_state_peer_ntoh(&sp->dst, &st->dst);
522
523 st->rule.ptr = r;
524 st->nat_rule.ptr = NULL;
525 st->anchor.ptr = NULL;
526 st->rt_kif = NULL;
527
528 st->pfsync_time = time_uptime;
529 st->sync_state = PFSYNC_S_NONE;
530
531 if (!(flags & PFSYNC_SI_IOCTL))
532 st->state_flags |= PFSTATE_NOSYNC;
533
534 if ((error = pf_state_insert(kif, skw, sks, st)) != 0)
535 goto cleanup_state;
536
537 /* XXX when we have nat_rule/anchors, use STATE_INC_COUNTERS */
538 counter_u64_add(r->states_cur, 1);
539 counter_u64_add(r->states_tot, 1);
540
541 if (!(flags & PFSYNC_SI_IOCTL)) {
542 st->state_flags &= ~PFSTATE_NOSYNC;
543 if (st->state_flags & PFSTATE_ACK) {
544 pfsync_q_ins(st, PFSYNC_S_IACK);
545 pfsync_push(sc);
546 }
547 }
548 st->state_flags &= ~PFSTATE_ACK;
549 PF_STATE_UNLOCK(st);
550
551 return (0);
552
553cleanup:
554 error = ENOMEM;
555 if (skw == sks)
556 sks = NULL;
557 if (skw != NULL)
558 uma_zfree(V_pf_state_key_z, skw);
559 if (sks != NULL)
560 uma_zfree(V_pf_state_key_z, sks);
561
562cleanup_state: /* pf_state_insert() frees the state keys. */
563 if (st) {
564 if (st->dst.scrub)
565 uma_zfree(V_pf_state_scrub_z, st->dst.scrub);
566 if (st->src.scrub)
567 uma_zfree(V_pf_state_scrub_z, st->src.scrub);
568 uma_zfree(V_pf_state_z, st);
569 }
570 return (error);
571}
572
| 62
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/priv.h>
77#include <sys/protosw.h>
78#include <sys/socket.h>
79#include <sys/sockio.h>
80#include <sys/sysctl.h>
81
82#include <net/bpf.h>
83#include <net/if.h>
84#include <net/if_var.h>
85#include <net/if_clone.h>
86#include <net/if_types.h>
87#include <net/vnet.h>
88#include <net/pfvar.h>
89#include <net/if_pfsync.h>
90
91#include <netinet/if_ether.h>
92#include <netinet/in.h>
93#include <netinet/in_var.h>
94#include <netinet/ip.h>
95#include <netinet/ip_carp.h>
96#include <netinet/ip_var.h>
97#include <netinet/tcp.h>
98#include <netinet/tcp_fsm.h>
99#include <netinet/tcp_seq.h>
100
101#define PFSYNC_MINPKT ( \
102 sizeof(struct ip) + \
103 sizeof(struct pfsync_header) + \
104 sizeof(struct pfsync_subheader) )
105
106struct pfsync_pkt {
107 struct ip *ip;
108 struct in_addr src;
109 u_int8_t flags;
110};
111
112static int pfsync_upd_tcp(struct pf_state *, struct pfsync_state_peer *,
113 struct pfsync_state_peer *);
114static int pfsync_in_clr(struct pfsync_pkt *, struct mbuf *, int, int);
115static int pfsync_in_ins(struct pfsync_pkt *, struct mbuf *, int, int);
116static int pfsync_in_iack(struct pfsync_pkt *, struct mbuf *, int, int);
117static int pfsync_in_upd(struct pfsync_pkt *, struct mbuf *, int, int);
118static int pfsync_in_upd_c(struct pfsync_pkt *, struct mbuf *, int, int);
119static int pfsync_in_ureq(struct pfsync_pkt *, struct mbuf *, int, int);
120static int pfsync_in_del(struct pfsync_pkt *, struct mbuf *, int, int);
121static int pfsync_in_del_c(struct pfsync_pkt *, struct mbuf *, int, int);
122static int pfsync_in_bus(struct pfsync_pkt *, struct mbuf *, int, int);
123static int pfsync_in_tdb(struct pfsync_pkt *, struct mbuf *, int, int);
124static int pfsync_in_eof(struct pfsync_pkt *, struct mbuf *, int, int);
125static int pfsync_in_error(struct pfsync_pkt *, struct mbuf *, int, int);
126
127static int (*pfsync_acts[])(struct pfsync_pkt *, struct mbuf *, int, int) = {
128 pfsync_in_clr, /* PFSYNC_ACT_CLR */
129 pfsync_in_ins, /* PFSYNC_ACT_INS */
130 pfsync_in_iack, /* PFSYNC_ACT_INS_ACK */
131 pfsync_in_upd, /* PFSYNC_ACT_UPD */
132 pfsync_in_upd_c, /* PFSYNC_ACT_UPD_C */
133 pfsync_in_ureq, /* PFSYNC_ACT_UPD_REQ */
134 pfsync_in_del, /* PFSYNC_ACT_DEL */
135 pfsync_in_del_c, /* PFSYNC_ACT_DEL_C */
136 pfsync_in_error, /* PFSYNC_ACT_INS_F */
137 pfsync_in_error, /* PFSYNC_ACT_DEL_F */
138 pfsync_in_bus, /* PFSYNC_ACT_BUS */
139 pfsync_in_tdb, /* PFSYNC_ACT_TDB */
140 pfsync_in_eof /* PFSYNC_ACT_EOF */
141};
142
143struct pfsync_q {
144 void (*write)(struct pf_state *, void *);
145 size_t len;
146 u_int8_t action;
147};
148
149/* we have one of these for every PFSYNC_S_ */
150static void pfsync_out_state(struct pf_state *, void *);
151static void pfsync_out_iack(struct pf_state *, void *);
152static void pfsync_out_upd_c(struct pf_state *, void *);
153static void pfsync_out_del(struct pf_state *, void *);
154
155static struct pfsync_q pfsync_qs[] = {
156 { pfsync_out_state, sizeof(struct pfsync_state), PFSYNC_ACT_INS },
157 { pfsync_out_iack, sizeof(struct pfsync_ins_ack), PFSYNC_ACT_INS_ACK },
158 { pfsync_out_state, sizeof(struct pfsync_state), PFSYNC_ACT_UPD },
159 { pfsync_out_upd_c, sizeof(struct pfsync_upd_c), PFSYNC_ACT_UPD_C },
160 { pfsync_out_del, sizeof(struct pfsync_del_c), PFSYNC_ACT_DEL_C }
161};
162
163static void pfsync_q_ins(struct pf_state *, int);
164static void pfsync_q_del(struct pf_state *);
165
166static void pfsync_update_state(struct pf_state *);
167
168struct pfsync_upd_req_item {
169 TAILQ_ENTRY(pfsync_upd_req_item) ur_entry;
170 struct pfsync_upd_req ur_msg;
171};
172
173struct pfsync_deferral {
174 struct pfsync_softc *pd_sc;
175 TAILQ_ENTRY(pfsync_deferral) pd_entry;
176 u_int pd_refs;
177 struct callout pd_tmo;
178
179 struct pf_state *pd_st;
180 struct mbuf *pd_m;
181};
182
183struct pfsync_softc {
184 /* Configuration */
185 struct ifnet *sc_ifp;
186 struct ifnet *sc_sync_if;
187 struct ip_moptions sc_imo;
188 struct in_addr sc_sync_peer;
189 uint32_t sc_flags;
190#define PFSYNCF_OK 0x00000001
191#define PFSYNCF_DEFER 0x00000002
192#define PFSYNCF_PUSH 0x00000004
193 uint8_t sc_maxupdates;
194 struct ip sc_template;
195 struct callout sc_tmo;
196 struct mtx sc_mtx;
197
198 /* Queued data */
199 size_t sc_len;
200 TAILQ_HEAD(, pf_state) sc_qs[PFSYNC_S_COUNT];
201 TAILQ_HEAD(, pfsync_upd_req_item) sc_upd_req_list;
202 TAILQ_HEAD(, pfsync_deferral) sc_deferrals;
203 u_int sc_deferred;
204 void *sc_plus;
205 size_t sc_pluslen;
206
207 /* Bulk update info */
208 struct mtx sc_bulk_mtx;
209 uint32_t sc_ureq_sent;
210 int sc_bulk_tries;
211 uint32_t sc_ureq_received;
212 int sc_bulk_hashid;
213 uint64_t sc_bulk_stateid;
214 uint32_t sc_bulk_creatorid;
215 struct callout sc_bulk_tmo;
216 struct callout sc_bulkfail_tmo;
217};
218
219#define PFSYNC_LOCK(sc) mtx_lock(&(sc)->sc_mtx)
220#define PFSYNC_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx)
221#define PFSYNC_LOCK_ASSERT(sc) mtx_assert(&(sc)->sc_mtx, MA_OWNED)
222
223#define PFSYNC_BLOCK(sc) mtx_lock(&(sc)->sc_bulk_mtx)
224#define PFSYNC_BUNLOCK(sc) mtx_unlock(&(sc)->sc_bulk_mtx)
225#define PFSYNC_BLOCK_ASSERT(sc) mtx_assert(&(sc)->sc_bulk_mtx, MA_OWNED)
226
227static const char pfsyncname[] = "pfsync";
228static MALLOC_DEFINE(M_PFSYNC, pfsyncname, "pfsync(4) data");
229static VNET_DEFINE(struct pfsync_softc *, pfsyncif) = NULL;
230#define V_pfsyncif VNET(pfsyncif)
231static VNET_DEFINE(void *, pfsync_swi_cookie) = NULL;
232#define V_pfsync_swi_cookie VNET(pfsync_swi_cookie)
233static VNET_DEFINE(struct pfsyncstats, pfsyncstats);
234#define V_pfsyncstats VNET(pfsyncstats)
235static VNET_DEFINE(int, pfsync_carp_adj) = CARP_MAXSKEW;
236#define V_pfsync_carp_adj VNET(pfsync_carp_adj)
237
238static void pfsync_timeout(void *);
239static void pfsync_push(struct pfsync_softc *);
240static void pfsyncintr(void *);
241static int pfsync_multicast_setup(struct pfsync_softc *, struct ifnet *,
242 void *);
243static void pfsync_multicast_cleanup(struct pfsync_softc *);
244static void pfsync_pointers_init(void);
245static void pfsync_pointers_uninit(void);
246static int pfsync_init(void);
247static void pfsync_uninit(void);
248
249SYSCTL_NODE(_net, OID_AUTO, pfsync, CTLFLAG_RW, 0, "PFSYNC");
250SYSCTL_VNET_STRUCT(_net_pfsync, OID_AUTO, stats, CTLFLAG_RW,
251 &VNET_NAME(pfsyncstats), pfsyncstats,
252 "PFSYNC statistics (struct pfsyncstats, net/if_pfsync.h)");
253SYSCTL_INT(_net_pfsync, OID_AUTO, carp_demotion_factor, CTLFLAG_RW,
254 &VNET_NAME(pfsync_carp_adj), 0, "pfsync's CARP demotion factor adjustment");
255
256static int pfsync_clone_create(struct if_clone *, int, caddr_t);
257static void pfsync_clone_destroy(struct ifnet *);
258static int pfsync_alloc_scrub_memory(struct pfsync_state_peer *,
259 struct pf_state_peer *);
260static int pfsyncoutput(struct ifnet *, struct mbuf *,
261 const struct sockaddr *, struct route *);
262static int pfsyncioctl(struct ifnet *, u_long, caddr_t);
263
264static int pfsync_defer(struct pf_state *, struct mbuf *);
265static void pfsync_undefer(struct pfsync_deferral *, int);
266static void pfsync_undefer_state(struct pf_state *, int);
267static void pfsync_defer_tmo(void *);
268
269static void pfsync_request_update(u_int32_t, u_int64_t);
270static void pfsync_update_state_req(struct pf_state *);
271
272static void pfsync_drop(struct pfsync_softc *);
273static void pfsync_sendout(int);
274static void pfsync_send_plus(void *, size_t);
275
276static void pfsync_bulk_start(void);
277static void pfsync_bulk_status(u_int8_t);
278static void pfsync_bulk_update(void *);
279static void pfsync_bulk_fail(void *);
280
281#ifdef IPSEC
282static void pfsync_update_net_tdb(struct pfsync_tdb *);
283#endif
284
285#define PFSYNC_MAX_BULKTRIES 12
286
287VNET_DEFINE(struct if_clone *, pfsync_cloner);
288#define V_pfsync_cloner VNET(pfsync_cloner)
289
290static int
291pfsync_clone_create(struct if_clone *ifc, int unit, caddr_t param)
292{
293 struct pfsync_softc *sc;
294 struct ifnet *ifp;
295 int q;
296
297 if (unit != 0)
298 return (EINVAL);
299
300 sc = malloc(sizeof(struct pfsync_softc), M_PFSYNC, M_WAITOK | M_ZERO);
301 sc->sc_flags |= PFSYNCF_OK;
302
303 for (q = 0; q < PFSYNC_S_COUNT; q++)
304 TAILQ_INIT(&sc->sc_qs[q]);
305
306 TAILQ_INIT(&sc->sc_upd_req_list);
307 TAILQ_INIT(&sc->sc_deferrals);
308
309 sc->sc_len = PFSYNC_MINPKT;
310 sc->sc_maxupdates = 128;
311
312 ifp = sc->sc_ifp = if_alloc(IFT_PFSYNC);
313 if (ifp == NULL) {
314 free(sc, M_PFSYNC);
315 return (ENOSPC);
316 }
317 if_initname(ifp, pfsyncname, unit);
318 ifp->if_softc = sc;
319 ifp->if_ioctl = pfsyncioctl;
320 ifp->if_output = pfsyncoutput;
321 ifp->if_type = IFT_PFSYNC;
322 ifp->if_snd.ifq_maxlen = ifqmaxlen;
323 ifp->if_hdrlen = sizeof(struct pfsync_header);
324 ifp->if_mtu = ETHERMTU;
325 mtx_init(&sc->sc_mtx, pfsyncname, NULL, MTX_DEF);
326 mtx_init(&sc->sc_bulk_mtx, "pfsync bulk", NULL, MTX_DEF);
327 callout_init(&sc->sc_tmo, CALLOUT_MPSAFE);
328 callout_init_mtx(&sc->sc_bulk_tmo, &sc->sc_bulk_mtx, 0);
329 callout_init_mtx(&sc->sc_bulkfail_tmo, &sc->sc_bulk_mtx, 0);
330
331 if_attach(ifp);
332
333 bpfattach(ifp, DLT_PFSYNC, PFSYNC_HDRLEN);
334
335 V_pfsyncif = sc;
336
337 return (0);
338}
339
340static void
341pfsync_clone_destroy(struct ifnet *ifp)
342{
343 struct pfsync_softc *sc = ifp->if_softc;
344
345 /*
346 * At this stage, everything should have already been
347 * cleared by pfsync_uninit(), and we have only to
348 * drain callouts.
349 */
350 while (sc->sc_deferred > 0) {
351 struct pfsync_deferral *pd = TAILQ_FIRST(&sc->sc_deferrals);
352
353 TAILQ_REMOVE(&sc->sc_deferrals, pd, pd_entry);
354 sc->sc_deferred--;
355 if (callout_stop(&pd->pd_tmo)) {
356 pf_release_state(pd->pd_st);
357 m_freem(pd->pd_m);
358 free(pd, M_PFSYNC);
359 } else {
360 pd->pd_refs++;
361 callout_drain(&pd->pd_tmo);
362 free(pd, M_PFSYNC);
363 }
364 }
365
366 callout_drain(&sc->sc_tmo);
367 callout_drain(&sc->sc_bulkfail_tmo);
368 callout_drain(&sc->sc_bulk_tmo);
369
370 if (!(sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p)
371 (*carp_demote_adj_p)(-V_pfsync_carp_adj, "pfsync destroy");
372 bpfdetach(ifp);
373 if_detach(ifp);
374
375 pfsync_drop(sc);
376
377 if_free(ifp);
378 if (sc->sc_imo.imo_membership)
379 pfsync_multicast_cleanup(sc);
380 mtx_destroy(&sc->sc_mtx);
381 mtx_destroy(&sc->sc_bulk_mtx);
382 free(sc, M_PFSYNC);
383
384 V_pfsyncif = NULL;
385}
386
387static int
388pfsync_alloc_scrub_memory(struct pfsync_state_peer *s,
389 struct pf_state_peer *d)
390{
391 if (s->scrub.scrub_flag && d->scrub == NULL) {
392 d->scrub = uma_zalloc(V_pf_state_scrub_z, M_NOWAIT | M_ZERO);
393 if (d->scrub == NULL)
394 return (ENOMEM);
395 }
396
397 return (0);
398}
399
400
401static int
402pfsync_state_import(struct pfsync_state *sp, u_int8_t flags)
403{
404 struct pfsync_softc *sc = V_pfsyncif;
405#ifndef __NO_STRICT_ALIGNMENT
406 struct pfsync_state_key key[2];
407#endif
408 struct pfsync_state_key *kw, *ks;
409 struct pf_state *st = NULL;
410 struct pf_state_key *skw = NULL, *sks = NULL;
411 struct pf_rule *r = NULL;
412 struct pfi_kif *kif;
413 int error;
414
415 PF_RULES_RASSERT();
416
417 if (sp->creatorid == 0) {
418 if (V_pf_status.debug >= PF_DEBUG_MISC)
419 printf("%s: invalid creator id: %08x\n", __func__,
420 ntohl(sp->creatorid));
421 return (EINVAL);
422 }
423
424 if ((kif = pfi_kif_find(sp->ifname)) == NULL) {
425 if (V_pf_status.debug >= PF_DEBUG_MISC)
426 printf("%s: unknown interface: %s\n", __func__,
427 sp->ifname);
428 if (flags & PFSYNC_SI_IOCTL)
429 return (EINVAL);
430 return (0); /* skip this state */
431 }
432
433 /*
434 * If the ruleset checksums match or the state is coming from the ioctl,
435 * it's safe to associate the state with the rule of that number.
436 */
437 if (sp->rule != htonl(-1) && sp->anchor == htonl(-1) &&
438 (flags & (PFSYNC_SI_IOCTL | PFSYNC_SI_CKSUM)) && ntohl(sp->rule) <
439 pf_main_ruleset.rules[PF_RULESET_FILTER].active.rcount)
440 r = pf_main_ruleset.rules[
441 PF_RULESET_FILTER].active.ptr_array[ntohl(sp->rule)];
442 else
443 r = &V_pf_default_rule;
444
445 if ((r->max_states &&
446 counter_u64_fetch(r->states_cur) >= r->max_states))
447 goto cleanup;
448
449 /*
450 * XXXGL: consider M_WAITOK in ioctl path after.
451 */
452 if ((st = uma_zalloc(V_pf_state_z, M_NOWAIT | M_ZERO)) == NULL)
453 goto cleanup;
454
455 if ((skw = uma_zalloc(V_pf_state_key_z, M_NOWAIT)) == NULL)
456 goto cleanup;
457
458#ifndef __NO_STRICT_ALIGNMENT
459 bcopy(&sp->key, key, sizeof(struct pfsync_state_key) * 2);
460 kw = &key[PF_SK_WIRE];
461 ks = &key[PF_SK_STACK];
462#else
463 kw = &sp->key[PF_SK_WIRE];
464 ks = &sp->key[PF_SK_STACK];
465#endif
466
467 if (PF_ANEQ(&kw->addr[0], &ks->addr[0], sp->af) ||
468 PF_ANEQ(&kw->addr[1], &ks->addr[1], sp->af) ||
469 kw->port[0] != ks->port[0] ||
470 kw->port[1] != ks->port[1]) {
471 sks = uma_zalloc(V_pf_state_key_z, M_NOWAIT);
472 if (sks == NULL)
473 goto cleanup;
474 } else
475 sks = skw;
476
477 /* allocate memory for scrub info */
478 if (pfsync_alloc_scrub_memory(&sp->src, &st->src) ||
479 pfsync_alloc_scrub_memory(&sp->dst, &st->dst))
480 goto cleanup;
481
482 /* Copy to state key(s). */
483 skw->addr[0] = kw->addr[0];
484 skw->addr[1] = kw->addr[1];
485 skw->port[0] = kw->port[0];
486 skw->port[1] = kw->port[1];
487 skw->proto = sp->proto;
488 skw->af = sp->af;
489 if (sks != skw) {
490 sks->addr[0] = ks->addr[0];
491 sks->addr[1] = ks->addr[1];
492 sks->port[0] = ks->port[0];
493 sks->port[1] = ks->port[1];
494 sks->proto = sp->proto;
495 sks->af = sp->af;
496 }
497
498 /* copy to state */
499 bcopy(&sp->rt_addr, &st->rt_addr, sizeof(st->rt_addr));
500 st->creation = time_uptime - ntohl(sp->creation);
501 st->expire = time_uptime;
502 if (sp->expire) {
503 uint32_t timeout;
504
505 timeout = r->timeout[sp->timeout];
506 if (!timeout)
507 timeout = V_pf_default_rule.timeout[sp->timeout];
508
509 /* sp->expire may have been adaptively scaled by export. */
510 st->expire -= timeout - ntohl(sp->expire);
511 }
512
513 st->direction = sp->direction;
514 st->log = sp->log;
515 st->timeout = sp->timeout;
516 st->state_flags = sp->state_flags;
517
518 st->id = sp->id;
519 st->creatorid = sp->creatorid;
520 pf_state_peer_ntoh(&sp->src, &st->src);
521 pf_state_peer_ntoh(&sp->dst, &st->dst);
522
523 st->rule.ptr = r;
524 st->nat_rule.ptr = NULL;
525 st->anchor.ptr = NULL;
526 st->rt_kif = NULL;
527
528 st->pfsync_time = time_uptime;
529 st->sync_state = PFSYNC_S_NONE;
530
531 if (!(flags & PFSYNC_SI_IOCTL))
532 st->state_flags |= PFSTATE_NOSYNC;
533
534 if ((error = pf_state_insert(kif, skw, sks, st)) != 0)
535 goto cleanup_state;
536
537 /* XXX when we have nat_rule/anchors, use STATE_INC_COUNTERS */
538 counter_u64_add(r->states_cur, 1);
539 counter_u64_add(r->states_tot, 1);
540
541 if (!(flags & PFSYNC_SI_IOCTL)) {
542 st->state_flags &= ~PFSTATE_NOSYNC;
543 if (st->state_flags & PFSTATE_ACK) {
544 pfsync_q_ins(st, PFSYNC_S_IACK);
545 pfsync_push(sc);
546 }
547 }
548 st->state_flags &= ~PFSTATE_ACK;
549 PF_STATE_UNLOCK(st);
550
551 return (0);
552
553cleanup:
554 error = ENOMEM;
555 if (skw == sks)
556 sks = NULL;
557 if (skw != NULL)
558 uma_zfree(V_pf_state_key_z, skw);
559 if (sks != NULL)
560 uma_zfree(V_pf_state_key_z, sks);
561
562cleanup_state: /* pf_state_insert() frees the state keys. */
563 if (st) {
564 if (st->dst.scrub)
565 uma_zfree(V_pf_state_scrub_z, st->dst.scrub);
566 if (st->src.scrub)
567 uma_zfree(V_pf_state_scrub_z, st->src.scrub);
568 uma_zfree(V_pf_state_z, st);
569 }
570 return (error);
571}
572
|
672}
673
674static int
675pfsync_in_clr(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
676{
677 struct pfsync_clr *clr;
678 struct mbuf *mp;
679 int len = sizeof(*clr) * count;
680 int i, offp;
681 u_int32_t creatorid;
682
683 mp = m_pulldown(m, offset, len, &offp);
684 if (mp == NULL) {
685 V_pfsyncstats.pfsyncs_badlen++;
686 return (-1);
687 }
688 clr = (struct pfsync_clr *)(mp->m_data + offp);
689
690 for (i = 0; i < count; i++) {
691 creatorid = clr[i].creatorid;
692
693 if (clr[i].ifname[0] != '\0' &&
694 pfi_kif_find(clr[i].ifname) == NULL)
695 continue;
696
697 for (int i = 0; i <= pf_hashmask; i++) {
698 struct pf_idhash *ih = &V_pf_idhash[i];
699 struct pf_state *s;
700relock:
701 PF_HASHROW_LOCK(ih);
702 LIST_FOREACH(s, &ih->states, entry) {
703 if (s->creatorid == creatorid) {
704 s->state_flags |= PFSTATE_NOSYNC;
705 pf_unlink_state(s, PF_ENTER_LOCKED);
706 goto relock;
707 }
708 }
709 PF_HASHROW_UNLOCK(ih);
710 }
711 }
712
713 return (len);
714}
715
716static int
717pfsync_in_ins(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
718{
719 struct mbuf *mp;
720 struct pfsync_state *sa, *sp;
721 int len = sizeof(*sp) * count;
722 int i, offp;
723
724 mp = m_pulldown(m, offset, len, &offp);
725 if (mp == NULL) {
726 V_pfsyncstats.pfsyncs_badlen++;
727 return (-1);
728 }
729 sa = (struct pfsync_state *)(mp->m_data + offp);
730
731 for (i = 0; i < count; i++) {
732 sp = &sa[i];
733
734 /* Check for invalid values. */
735 if (sp->timeout >= PFTM_MAX ||
736 sp->src.state > PF_TCPS_PROXY_DST ||
737 sp->dst.state > PF_TCPS_PROXY_DST ||
738 sp->direction > PF_OUT ||
739 (sp->af != AF_INET && sp->af != AF_INET6)) {
740 if (V_pf_status.debug >= PF_DEBUG_MISC)
741 printf("%s: invalid value\n", __func__);
742 V_pfsyncstats.pfsyncs_badval++;
743 continue;
744 }
745
746 if (pfsync_state_import(sp, pkt->flags) == ENOMEM)
747 /* Drop out, but process the rest of the actions. */
748 break;
749 }
750
751 return (len);
752}
753
754static int
755pfsync_in_iack(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
756{
757 struct pfsync_ins_ack *ia, *iaa;
758 struct pf_state *st;
759
760 struct mbuf *mp;
761 int len = count * sizeof(*ia);
762 int offp, i;
763
764 mp = m_pulldown(m, offset, len, &offp);
765 if (mp == NULL) {
766 V_pfsyncstats.pfsyncs_badlen++;
767 return (-1);
768 }
769 iaa = (struct pfsync_ins_ack *)(mp->m_data + offp);
770
771 for (i = 0; i < count; i++) {
772 ia = &iaa[i];
773
774 st = pf_find_state_byid(ia->id, ia->creatorid);
775 if (st == NULL)
776 continue;
777
778 if (st->state_flags & PFSTATE_ACK) {
779 PFSYNC_LOCK(V_pfsyncif);
780 pfsync_undefer_state(st, 0);
781 PFSYNC_UNLOCK(V_pfsyncif);
782 }
783 PF_STATE_UNLOCK(st);
784 }
785 /*
786 * XXX this is not yet implemented, but we know the size of the
787 * message so we can skip it.
788 */
789
790 return (count * sizeof(struct pfsync_ins_ack));
791}
792
793static int
794pfsync_upd_tcp(struct pf_state *st, struct pfsync_state_peer *src,
795 struct pfsync_state_peer *dst)
796{
797 int sync = 0;
798
799 PF_STATE_LOCK_ASSERT(st);
800
801 /*
802 * The state should never go backwards except
803 * for syn-proxy states. Neither should the
804 * sequence window slide backwards.
805 */
806 if ((st->src.state > src->state &&
807 (st->src.state < PF_TCPS_PROXY_SRC ||
808 src->state >= PF_TCPS_PROXY_SRC)) ||
809
810 (st->src.state == src->state &&
811 SEQ_GT(st->src.seqlo, ntohl(src->seqlo))))
812 sync++;
813 else
814 pf_state_peer_ntoh(src, &st->src);
815
816 if ((st->dst.state > dst->state) ||
817
818 (st->dst.state >= TCPS_SYN_SENT &&
819 SEQ_GT(st->dst.seqlo, ntohl(dst->seqlo))))
820 sync++;
821 else
822 pf_state_peer_ntoh(dst, &st->dst);
823
824 return (sync);
825}
826
827static int
828pfsync_in_upd(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
829{
830 struct pfsync_softc *sc = V_pfsyncif;
831 struct pfsync_state *sa, *sp;
832 struct pf_state *st;
833 int sync;
834
835 struct mbuf *mp;
836 int len = count * sizeof(*sp);
837 int offp, i;
838
839 mp = m_pulldown(m, offset, len, &offp);
840 if (mp == NULL) {
841 V_pfsyncstats.pfsyncs_badlen++;
842 return (-1);
843 }
844 sa = (struct pfsync_state *)(mp->m_data + offp);
845
846 for (i = 0; i < count; i++) {
847 sp = &sa[i];
848
849 /* check for invalid values */
850 if (sp->timeout >= PFTM_MAX ||
851 sp->src.state > PF_TCPS_PROXY_DST ||
852 sp->dst.state > PF_TCPS_PROXY_DST) {
853 if (V_pf_status.debug >= PF_DEBUG_MISC) {
854 printf("pfsync_input: PFSYNC_ACT_UPD: "
855 "invalid value\n");
856 }
857 V_pfsyncstats.pfsyncs_badval++;
858 continue;
859 }
860
861 st = pf_find_state_byid(sp->id, sp->creatorid);
862 if (st == NULL) {
863 /* insert the update */
864 if (pfsync_state_import(sp, 0))
865 V_pfsyncstats.pfsyncs_badstate++;
866 continue;
867 }
868
869 if (st->state_flags & PFSTATE_ACK) {
870 PFSYNC_LOCK(sc);
871 pfsync_undefer_state(st, 1);
872 PFSYNC_UNLOCK(sc);
873 }
874
875 if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP)
876 sync = pfsync_upd_tcp(st, &sp->src, &sp->dst);
877 else {
878 sync = 0;
879
880 /*
881 * Non-TCP protocol state machine always go
882 * forwards
883 */
884 if (st->src.state > sp->src.state)
885 sync++;
886 else
887 pf_state_peer_ntoh(&sp->src, &st->src);
888 if (st->dst.state > sp->dst.state)
889 sync++;
890 else
891 pf_state_peer_ntoh(&sp->dst, &st->dst);
892 }
893 if (sync < 2) {
894 pfsync_alloc_scrub_memory(&sp->dst, &st->dst);
895 pf_state_peer_ntoh(&sp->dst, &st->dst);
896 st->expire = time_uptime;
897 st->timeout = sp->timeout;
898 }
899 st->pfsync_time = time_uptime;
900
901 if (sync) {
902 V_pfsyncstats.pfsyncs_stale++;
903
904 pfsync_update_state(st);
905 PF_STATE_UNLOCK(st);
906 PFSYNC_LOCK(sc);
907 pfsync_push(sc);
908 PFSYNC_UNLOCK(sc);
909 continue;
910 }
911 PF_STATE_UNLOCK(st);
912 }
913
914 return (len);
915}
916
917static int
918pfsync_in_upd_c(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
919{
920 struct pfsync_softc *sc = V_pfsyncif;
921 struct pfsync_upd_c *ua, *up;
922 struct pf_state *st;
923 int len = count * sizeof(*up);
924 int sync;
925 struct mbuf *mp;
926 int offp, i;
927
928 mp = m_pulldown(m, offset, len, &offp);
929 if (mp == NULL) {
930 V_pfsyncstats.pfsyncs_badlen++;
931 return (-1);
932 }
933 ua = (struct pfsync_upd_c *)(mp->m_data + offp);
934
935 for (i = 0; i < count; i++) {
936 up = &ua[i];
937
938 /* check for invalid values */
939 if (up->timeout >= PFTM_MAX ||
940 up->src.state > PF_TCPS_PROXY_DST ||
941 up->dst.state > PF_TCPS_PROXY_DST) {
942 if (V_pf_status.debug >= PF_DEBUG_MISC) {
943 printf("pfsync_input: "
944 "PFSYNC_ACT_UPD_C: "
945 "invalid value\n");
946 }
947 V_pfsyncstats.pfsyncs_badval++;
948 continue;
949 }
950
951 st = pf_find_state_byid(up->id, up->creatorid);
952 if (st == NULL) {
953 /* We don't have this state. Ask for it. */
954 PFSYNC_LOCK(sc);
955 pfsync_request_update(up->creatorid, up->id);
956 PFSYNC_UNLOCK(sc);
957 continue;
958 }
959
960 if (st->state_flags & PFSTATE_ACK) {
961 PFSYNC_LOCK(sc);
962 pfsync_undefer_state(st, 1);
963 PFSYNC_UNLOCK(sc);
964 }
965
966 if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP)
967 sync = pfsync_upd_tcp(st, &up->src, &up->dst);
968 else {
969 sync = 0;
970
971 /*
972 * Non-TCP protocol state machine always go
973 * forwards
974 */
975 if (st->src.state > up->src.state)
976 sync++;
977 else
978 pf_state_peer_ntoh(&up->src, &st->src);
979 if (st->dst.state > up->dst.state)
980 sync++;
981 else
982 pf_state_peer_ntoh(&up->dst, &st->dst);
983 }
984 if (sync < 2) {
985 pfsync_alloc_scrub_memory(&up->dst, &st->dst);
986 pf_state_peer_ntoh(&up->dst, &st->dst);
987 st->expire = time_uptime;
988 st->timeout = up->timeout;
989 }
990 st->pfsync_time = time_uptime;
991
992 if (sync) {
993 V_pfsyncstats.pfsyncs_stale++;
994
995 pfsync_update_state(st);
996 PF_STATE_UNLOCK(st);
997 PFSYNC_LOCK(sc);
998 pfsync_push(sc);
999 PFSYNC_UNLOCK(sc);
1000 continue;
1001 }
1002 PF_STATE_UNLOCK(st);
1003 }
1004
1005 return (len);
1006}
1007
1008static int
1009pfsync_in_ureq(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
1010{
1011 struct pfsync_upd_req *ur, *ura;
1012 struct mbuf *mp;
1013 int len = count * sizeof(*ur);
1014 int i, offp;
1015
1016 struct pf_state *st;
1017
1018 mp = m_pulldown(m, offset, len, &offp);
1019 if (mp == NULL) {
1020 V_pfsyncstats.pfsyncs_badlen++;
1021 return (-1);
1022 }
1023 ura = (struct pfsync_upd_req *)(mp->m_data + offp);
1024
1025 for (i = 0; i < count; i++) {
1026 ur = &ura[i];
1027
1028 if (ur->id == 0 && ur->creatorid == 0)
1029 pfsync_bulk_start();
1030 else {
1031 st = pf_find_state_byid(ur->id, ur->creatorid);
1032 if (st == NULL) {
1033 V_pfsyncstats.pfsyncs_badstate++;
1034 continue;
1035 }
1036 if (st->state_flags & PFSTATE_NOSYNC) {
1037 PF_STATE_UNLOCK(st);
1038 continue;
1039 }
1040
1041 pfsync_update_state_req(st);
1042 PF_STATE_UNLOCK(st);
1043 }
1044 }
1045
1046 return (len);
1047}
1048
1049static int
1050pfsync_in_del(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
1051{
1052 struct mbuf *mp;
1053 struct pfsync_state *sa, *sp;
1054 struct pf_state *st;
1055 int len = count * sizeof(*sp);
1056 int offp, i;
1057
1058 mp = m_pulldown(m, offset, len, &offp);
1059 if (mp == NULL) {
1060 V_pfsyncstats.pfsyncs_badlen++;
1061 return (-1);
1062 }
1063 sa = (struct pfsync_state *)(mp->m_data + offp);
1064
1065 for (i = 0; i < count; i++) {
1066 sp = &sa[i];
1067
1068 st = pf_find_state_byid(sp->id, sp->creatorid);
1069 if (st == NULL) {
1070 V_pfsyncstats.pfsyncs_badstate++;
1071 continue;
1072 }
1073 st->state_flags |= PFSTATE_NOSYNC;
1074 pf_unlink_state(st, PF_ENTER_LOCKED);
1075 }
1076
1077 return (len);
1078}
1079
1080static int
1081pfsync_in_del_c(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
1082{
1083 struct mbuf *mp;
1084 struct pfsync_del_c *sa, *sp;
1085 struct pf_state *st;
1086 int len = count * sizeof(*sp);
1087 int offp, i;
1088
1089 mp = m_pulldown(m, offset, len, &offp);
1090 if (mp == NULL) {
1091 V_pfsyncstats.pfsyncs_badlen++;
1092 return (-1);
1093 }
1094 sa = (struct pfsync_del_c *)(mp->m_data + offp);
1095
1096 for (i = 0; i < count; i++) {
1097 sp = &sa[i];
1098
1099 st = pf_find_state_byid(sp->id, sp->creatorid);
1100 if (st == NULL) {
1101 V_pfsyncstats.pfsyncs_badstate++;
1102 continue;
1103 }
1104
1105 st->state_flags |= PFSTATE_NOSYNC;
1106 pf_unlink_state(st, PF_ENTER_LOCKED);
1107 }
1108
1109 return (len);
1110}
1111
1112static int
1113pfsync_in_bus(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
1114{
1115 struct pfsync_softc *sc = V_pfsyncif;
1116 struct pfsync_bus *bus;
1117 struct mbuf *mp;
1118 int len = count * sizeof(*bus);
1119 int offp;
1120
1121 PFSYNC_BLOCK(sc);
1122
1123 /* If we're not waiting for a bulk update, who cares. */
1124 if (sc->sc_ureq_sent == 0) {
1125 PFSYNC_BUNLOCK(sc);
1126 return (len);
1127 }
1128
1129 mp = m_pulldown(m, offset, len, &offp);
1130 if (mp == NULL) {
1131 PFSYNC_BUNLOCK(sc);
1132 V_pfsyncstats.pfsyncs_badlen++;
1133 return (-1);
1134 }
1135 bus = (struct pfsync_bus *)(mp->m_data + offp);
1136
1137 switch (bus->status) {
1138 case PFSYNC_BUS_START:
1139 callout_reset(&sc->sc_bulkfail_tmo, 4 * hz +
1140 V_pf_limits[PF_LIMIT_STATES].limit /
1141 ((sc->sc_ifp->if_mtu - PFSYNC_MINPKT) /
1142 sizeof(struct pfsync_state)),
1143 pfsync_bulk_fail, sc);
1144 if (V_pf_status.debug >= PF_DEBUG_MISC)
1145 printf("pfsync: received bulk update start\n");
1146 break;
1147
1148 case PFSYNC_BUS_END:
1149 if (time_uptime - ntohl(bus->endtime) >=
1150 sc->sc_ureq_sent) {
1151 /* that's it, we're happy */
1152 sc->sc_ureq_sent = 0;
1153 sc->sc_bulk_tries = 0;
1154 callout_stop(&sc->sc_bulkfail_tmo);
1155 if (!(sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p)
1156 (*carp_demote_adj_p)(-V_pfsync_carp_adj,
1157 "pfsync bulk done");
1158 sc->sc_flags |= PFSYNCF_OK;
1159 if (V_pf_status.debug >= PF_DEBUG_MISC)
1160 printf("pfsync: received valid "
1161 "bulk update end\n");
1162 } else {
1163 if (V_pf_status.debug >= PF_DEBUG_MISC)
1164 printf("pfsync: received invalid "
1165 "bulk update end: bad timestamp\n");
1166 }
1167 break;
1168 }
1169 PFSYNC_BUNLOCK(sc);
1170
1171 return (len);
1172}
1173
1174static int
1175pfsync_in_tdb(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
1176{
1177 int len = count * sizeof(struct pfsync_tdb);
1178
1179#if defined(IPSEC)
1180 struct pfsync_tdb *tp;
1181 struct mbuf *mp;
1182 int offp;
1183 int i;
1184 int s;
1185
1186 mp = m_pulldown(m, offset, len, &offp);
1187 if (mp == NULL) {
1188 V_pfsyncstats.pfsyncs_badlen++;
1189 return (-1);
1190 }
1191 tp = (struct pfsync_tdb *)(mp->m_data + offp);
1192
1193 for (i = 0; i < count; i++)
1194 pfsync_update_net_tdb(&tp[i]);
1195#endif
1196
1197 return (len);
1198}
1199
1200#if defined(IPSEC)
1201/* Update an in-kernel tdb. Silently fail if no tdb is found. */
1202static void
1203pfsync_update_net_tdb(struct pfsync_tdb *pt)
1204{
1205 struct tdb *tdb;
1206 int s;
1207
1208 /* check for invalid values */
1209 if (ntohl(pt->spi) <= SPI_RESERVED_MAX ||
1210 (pt->dst.sa.sa_family != AF_INET &&
1211 pt->dst.sa.sa_family != AF_INET6))
1212 goto bad;
1213
1214 tdb = gettdb(pt->spi, &pt->dst, pt->sproto);
1215 if (tdb) {
1216 pt->rpl = ntohl(pt->rpl);
1217 pt->cur_bytes = (unsigned long long)be64toh(pt->cur_bytes);
1218
1219 /* Neither replay nor byte counter should ever decrease. */
1220 if (pt->rpl < tdb->tdb_rpl ||
1221 pt->cur_bytes < tdb->tdb_cur_bytes) {
1222 goto bad;
1223 }
1224
1225 tdb->tdb_rpl = pt->rpl;
1226 tdb->tdb_cur_bytes = pt->cur_bytes;
1227 }
1228 return;
1229
1230bad:
1231 if (V_pf_status.debug >= PF_DEBUG_MISC)
1232 printf("pfsync_insert: PFSYNC_ACT_TDB_UPD: "
1233 "invalid value\n");
1234 V_pfsyncstats.pfsyncs_badstate++;
1235 return;
1236}
1237#endif
1238
1239
1240static int
1241pfsync_in_eof(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
1242{
1243 /* check if we are at the right place in the packet */
1244 if (offset != m->m_pkthdr.len)
1245 V_pfsyncstats.pfsyncs_badlen++;
1246
1247 /* we're done. free and let the caller return */
1248 m_freem(m);
1249 return (-1);
1250}
1251
1252static int
1253pfsync_in_error(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
1254{
1255 V_pfsyncstats.pfsyncs_badact++;
1256
1257 m_freem(m);
1258 return (-1);
1259}
1260
1261static int
1262pfsyncoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
1263 struct route *rt)
1264{
1265 m_freem(m);
1266 return (0);
1267}
1268
1269/* ARGSUSED */
1270static int
1271pfsyncioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
1272{
1273 struct pfsync_softc *sc = ifp->if_softc;
1274 struct ifreq *ifr = (struct ifreq *)data;
1275 struct pfsyncreq pfsyncr;
1276 int error;
1277
1278 switch (cmd) {
1279 case SIOCSIFFLAGS:
1280 PFSYNC_LOCK(sc);
1281 if (ifp->if_flags & IFF_UP) {
1282 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1283 PFSYNC_UNLOCK(sc);
1284 pfsync_pointers_init();
1285 } else {
1286 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1287 PFSYNC_UNLOCK(sc);
1288 pfsync_pointers_uninit();
1289 }
1290 break;
1291 case SIOCSIFMTU:
1292 if (!sc->sc_sync_if ||
1293 ifr->ifr_mtu <= PFSYNC_MINPKT ||
1294 ifr->ifr_mtu > sc->sc_sync_if->if_mtu)
1295 return (EINVAL);
1296 if (ifr->ifr_mtu < ifp->if_mtu) {
1297 PFSYNC_LOCK(sc);
1298 if (sc->sc_len > PFSYNC_MINPKT)
1299 pfsync_sendout(1);
1300 PFSYNC_UNLOCK(sc);
1301 }
1302 ifp->if_mtu = ifr->ifr_mtu;
1303 break;
1304 case SIOCGETPFSYNC:
1305 bzero(&pfsyncr, sizeof(pfsyncr));
1306 PFSYNC_LOCK(sc);
1307 if (sc->sc_sync_if) {
1308 strlcpy(pfsyncr.pfsyncr_syncdev,
1309 sc->sc_sync_if->if_xname, IFNAMSIZ);
1310 }
1311 pfsyncr.pfsyncr_syncpeer = sc->sc_sync_peer;
1312 pfsyncr.pfsyncr_maxupdates = sc->sc_maxupdates;
1313 pfsyncr.pfsyncr_defer = (PFSYNCF_DEFER ==
1314 (sc->sc_flags & PFSYNCF_DEFER));
1315 PFSYNC_UNLOCK(sc);
1316 return (copyout(&pfsyncr, ifr->ifr_data, sizeof(pfsyncr)));
1317
1318 case SIOCSETPFSYNC:
1319 {
1320 struct ip_moptions *imo = &sc->sc_imo;
1321 struct ifnet *sifp;
1322 struct ip *ip;
1323 void *mship = NULL;
1324
1325 if ((error = priv_check(curthread, PRIV_NETINET_PF)) != 0)
1326 return (error);
1327 if ((error = copyin(ifr->ifr_data, &pfsyncr, sizeof(pfsyncr))))
1328 return (error);
1329
1330 if (pfsyncr.pfsyncr_maxupdates > 255)
1331 return (EINVAL);
1332
1333 if (pfsyncr.pfsyncr_syncdev[0] == 0)
1334 sifp = NULL;
1335 else if ((sifp = ifunit_ref(pfsyncr.pfsyncr_syncdev)) == NULL)
1336 return (EINVAL);
1337
1338 if (sifp != NULL && (
1339 pfsyncr.pfsyncr_syncpeer.s_addr == 0 ||
1340 pfsyncr.pfsyncr_syncpeer.s_addr ==
1341 htonl(INADDR_PFSYNC_GROUP)))
1342 mship = malloc((sizeof(struct in_multi *) *
1343 IP_MIN_MEMBERSHIPS), M_PFSYNC, M_WAITOK | M_ZERO);
1344
1345 PFSYNC_LOCK(sc);
1346 if (pfsyncr.pfsyncr_syncpeer.s_addr == 0)
1347 sc->sc_sync_peer.s_addr = htonl(INADDR_PFSYNC_GROUP);
1348 else
1349 sc->sc_sync_peer.s_addr =
1350 pfsyncr.pfsyncr_syncpeer.s_addr;
1351
1352 sc->sc_maxupdates = pfsyncr.pfsyncr_maxupdates;
1353 if (pfsyncr.pfsyncr_defer) {
1354 sc->sc_flags |= PFSYNCF_DEFER;
1355 pfsync_defer_ptr = pfsync_defer;
1356 } else {
1357 sc->sc_flags &= ~PFSYNCF_DEFER;
1358 pfsync_defer_ptr = NULL;
1359 }
1360
1361 if (sifp == NULL) {
1362 if (sc->sc_sync_if)
1363 if_rele(sc->sc_sync_if);
1364 sc->sc_sync_if = NULL;
1365 if (imo->imo_membership)
1366 pfsync_multicast_cleanup(sc);
1367 PFSYNC_UNLOCK(sc);
1368 break;
1369 }
1370
1371 if (sc->sc_len > PFSYNC_MINPKT &&
1372 (sifp->if_mtu < sc->sc_ifp->if_mtu ||
1373 (sc->sc_sync_if != NULL &&
1374 sifp->if_mtu < sc->sc_sync_if->if_mtu) ||
1375 sifp->if_mtu < MCLBYTES - sizeof(struct ip)))
1376 pfsync_sendout(1);
1377
1378 if (imo->imo_membership)
1379 pfsync_multicast_cleanup(sc);
1380
1381 if (sc->sc_sync_peer.s_addr == htonl(INADDR_PFSYNC_GROUP)) {
1382 error = pfsync_multicast_setup(sc, sifp, mship);
1383 if (error) {
1384 if_rele(sifp);
1385 free(mship, M_PFSYNC);
1386 return (error);
1387 }
1388 }
1389 if (sc->sc_sync_if)
1390 if_rele(sc->sc_sync_if);
1391 sc->sc_sync_if = sifp;
1392
1393 ip = &sc->sc_template;
1394 bzero(ip, sizeof(*ip));
1395 ip->ip_v = IPVERSION;
1396 ip->ip_hl = sizeof(sc->sc_template) >> 2;
1397 ip->ip_tos = IPTOS_LOWDELAY;
1398 /* len and id are set later. */
1399 ip->ip_off = htons(IP_DF);
1400 ip->ip_ttl = PFSYNC_DFLTTL;
1401 ip->ip_p = IPPROTO_PFSYNC;
1402 ip->ip_src.s_addr = INADDR_ANY;
1403 ip->ip_dst.s_addr = sc->sc_sync_peer.s_addr;
1404
1405 /* Request a full state table update. */
1406 if ((sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p)
1407 (*carp_demote_adj_p)(V_pfsync_carp_adj,
1408 "pfsync bulk start");
1409 sc->sc_flags &= ~PFSYNCF_OK;
1410 if (V_pf_status.debug >= PF_DEBUG_MISC)
1411 printf("pfsync: requesting bulk update\n");
1412 pfsync_request_update(0, 0);
1413 PFSYNC_UNLOCK(sc);
1414 PFSYNC_BLOCK(sc);
1415 sc->sc_ureq_sent = time_uptime;
1416 callout_reset(&sc->sc_bulkfail_tmo, 5 * hz, pfsync_bulk_fail,
1417 sc);
1418 PFSYNC_BUNLOCK(sc);
1419
1420 break;
1421 }
1422 default:
1423 return (ENOTTY);
1424 }
1425
1426 return (0);
1427}
1428
1429static void
1430pfsync_out_state(struct pf_state *st, void *buf)
1431{
1432 struct pfsync_state *sp = buf;
1433
1434 pfsync_state_export(sp, st);
1435}
1436
1437static void
1438pfsync_out_iack(struct pf_state *st, void *buf)
1439{
1440 struct pfsync_ins_ack *iack = buf;
1441
1442 iack->id = st->id;
1443 iack->creatorid = st->creatorid;
1444}
1445
1446static void
1447pfsync_out_upd_c(struct pf_state *st, void *buf)
1448{
1449 struct pfsync_upd_c *up = buf;
1450
1451 bzero(up, sizeof(*up));
1452 up->id = st->id;
1453 pf_state_peer_hton(&st->src, &up->src);
1454 pf_state_peer_hton(&st->dst, &up->dst);
1455 up->creatorid = st->creatorid;
1456 up->timeout = st->timeout;
1457}
1458
1459static void
1460pfsync_out_del(struct pf_state *st, void *buf)
1461{
1462 struct pfsync_del_c *dp = buf;
1463
1464 dp->id = st->id;
1465 dp->creatorid = st->creatorid;
1466 st->state_flags |= PFSTATE_NOSYNC;
1467}
1468
1469static void
1470pfsync_drop(struct pfsync_softc *sc)
1471{
1472 struct pf_state *st, *next;
1473 struct pfsync_upd_req_item *ur;
1474 int q;
1475
1476 for (q = 0; q < PFSYNC_S_COUNT; q++) {
1477 if (TAILQ_EMPTY(&sc->sc_qs[q]))
1478 continue;
1479
1480 TAILQ_FOREACH_SAFE(st, &sc->sc_qs[q], sync_list, next) {
1481 KASSERT(st->sync_state == q,
1482 ("%s: st->sync_state == q",
1483 __func__));
1484 st->sync_state = PFSYNC_S_NONE;
1485 pf_release_state(st);
1486 }
1487 TAILQ_INIT(&sc->sc_qs[q]);
1488 }
1489
1490 while ((ur = TAILQ_FIRST(&sc->sc_upd_req_list)) != NULL) {
1491 TAILQ_REMOVE(&sc->sc_upd_req_list, ur, ur_entry);
1492 free(ur, M_PFSYNC);
1493 }
1494
1495 sc->sc_plus = NULL;
1496 sc->sc_len = PFSYNC_MINPKT;
1497}
1498
1499static void
1500pfsync_sendout(int schedswi)
1501{
1502 struct pfsync_softc *sc = V_pfsyncif;
1503 struct ifnet *ifp = sc->sc_ifp;
1504 struct mbuf *m;
1505 struct ip *ip;
1506 struct pfsync_header *ph;
1507 struct pfsync_subheader *subh;
1508 struct pf_state *st;
1509 struct pfsync_upd_req_item *ur;
1510 int offset;
1511 int q, count = 0;
1512
1513 KASSERT(sc != NULL, ("%s: null sc", __func__));
1514 KASSERT(sc->sc_len > PFSYNC_MINPKT,
1515 ("%s: sc_len %zu", __func__, sc->sc_len));
1516 PFSYNC_LOCK_ASSERT(sc);
1517
1518 if (ifp->if_bpf == NULL && sc->sc_sync_if == NULL) {
1519 pfsync_drop(sc);
1520 return;
1521 }
1522
1523 m = m_get2(max_linkhdr + sc->sc_len, M_NOWAIT, MT_DATA, M_PKTHDR);
1524 if (m == NULL) {
1525 sc->sc_ifp->if_oerrors++;
1526 V_pfsyncstats.pfsyncs_onomem++;
1527 return;
1528 }
1529 m->m_data += max_linkhdr;
1530 m->m_len = m->m_pkthdr.len = sc->sc_len;
1531
1532 /* build the ip header */
1533 ip = (struct ip *)m->m_data;
1534 bcopy(&sc->sc_template, ip, sizeof(*ip));
1535 offset = sizeof(*ip);
1536
1537 ip->ip_len = htons(m->m_pkthdr.len);
1538 ip->ip_id = htons(ip_randomid());
1539
1540 /* build the pfsync header */
1541 ph = (struct pfsync_header *)(m->m_data + offset);
1542 bzero(ph, sizeof(*ph));
1543 offset += sizeof(*ph);
1544
1545 ph->version = PFSYNC_VERSION;
1546 ph->len = htons(sc->sc_len - sizeof(*ip));
1547 bcopy(V_pf_status.pf_chksum, ph->pfcksum, PF_MD5_DIGEST_LENGTH);
1548
1549 /* walk the queues */
1550 for (q = 0; q < PFSYNC_S_COUNT; q++) {
1551 if (TAILQ_EMPTY(&sc->sc_qs[q]))
1552 continue;
1553
1554 subh = (struct pfsync_subheader *)(m->m_data + offset);
1555 offset += sizeof(*subh);
1556
1557 count = 0;
1558 TAILQ_FOREACH(st, &sc->sc_qs[q], sync_list) {
1559 KASSERT(st->sync_state == q,
1560 ("%s: st->sync_state == q",
1561 __func__));
1562 /*
1563 * XXXGL: some of write methods do unlocked reads
1564 * of state data :(
1565 */
1566 pfsync_qs[q].write(st, m->m_data + offset);
1567 offset += pfsync_qs[q].len;
1568 st->sync_state = PFSYNC_S_NONE;
1569 pf_release_state(st);
1570 count++;
1571 }
1572 TAILQ_INIT(&sc->sc_qs[q]);
1573
1574 bzero(subh, sizeof(*subh));
1575 subh->action = pfsync_qs[q].action;
1576 subh->count = htons(count);
1577 V_pfsyncstats.pfsyncs_oacts[pfsync_qs[q].action] += count;
1578 }
1579
1580 if (!TAILQ_EMPTY(&sc->sc_upd_req_list)) {
1581 subh = (struct pfsync_subheader *)(m->m_data + offset);
1582 offset += sizeof(*subh);
1583
1584 count = 0;
1585 while ((ur = TAILQ_FIRST(&sc->sc_upd_req_list)) != NULL) {
1586 TAILQ_REMOVE(&sc->sc_upd_req_list, ur, ur_entry);
1587
1588 bcopy(&ur->ur_msg, m->m_data + offset,
1589 sizeof(ur->ur_msg));
1590 offset += sizeof(ur->ur_msg);
1591 free(ur, M_PFSYNC);
1592 count++;
1593 }
1594
1595 bzero(subh, sizeof(*subh));
1596 subh->action = PFSYNC_ACT_UPD_REQ;
1597 subh->count = htons(count);
1598 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_UPD_REQ] += count;
1599 }
1600
1601 /* has someone built a custom region for us to add? */
1602 if (sc->sc_plus != NULL) {
1603 bcopy(sc->sc_plus, m->m_data + offset, sc->sc_pluslen);
1604 offset += sc->sc_pluslen;
1605
1606 sc->sc_plus = NULL;
1607 }
1608
1609 subh = (struct pfsync_subheader *)(m->m_data + offset);
1610 offset += sizeof(*subh);
1611
1612 bzero(subh, sizeof(*subh));
1613 subh->action = PFSYNC_ACT_EOF;
1614 subh->count = htons(1);
1615 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_EOF]++;
1616
1617 /* we're done, let's put it on the wire */
1618 if (ifp->if_bpf) {
1619 m->m_data += sizeof(*ip);
1620 m->m_len = m->m_pkthdr.len = sc->sc_len - sizeof(*ip);
1621 BPF_MTAP(ifp, m);
1622 m->m_data -= sizeof(*ip);
1623 m->m_len = m->m_pkthdr.len = sc->sc_len;
1624 }
1625
1626 if (sc->sc_sync_if == NULL) {
1627 sc->sc_len = PFSYNC_MINPKT;
1628 m_freem(m);
1629 return;
1630 }
1631
1632 sc->sc_ifp->if_opackets++;
1633 sc->sc_ifp->if_obytes += m->m_pkthdr.len;
1634 sc->sc_len = PFSYNC_MINPKT;
1635
1636 if (!_IF_QFULL(&sc->sc_ifp->if_snd))
1637 _IF_ENQUEUE(&sc->sc_ifp->if_snd, m);
1638 else {
1639 m_freem(m);
1640 sc->sc_ifp->if_snd.ifq_drops++;
1641 }
1642 if (schedswi)
1643 swi_sched(V_pfsync_swi_cookie, 0);
1644}
1645
1646static void
1647pfsync_insert_state(struct pf_state *st)
1648{
1649 struct pfsync_softc *sc = V_pfsyncif;
1650
1651 if (st->state_flags & PFSTATE_NOSYNC)
1652 return;
1653
1654 if ((st->rule.ptr->rule_flag & PFRULE_NOSYNC) ||
1655 st->key[PF_SK_WIRE]->proto == IPPROTO_PFSYNC) {
1656 st->state_flags |= PFSTATE_NOSYNC;
1657 return;
1658 }
1659
1660 KASSERT(st->sync_state == PFSYNC_S_NONE,
1661 ("%s: st->sync_state %u", __func__, st->sync_state));
1662
1663 PFSYNC_LOCK(sc);
1664 if (sc->sc_len == PFSYNC_MINPKT)
1665 callout_reset(&sc->sc_tmo, 1 * hz, pfsync_timeout, V_pfsyncif);
1666
1667 pfsync_q_ins(st, PFSYNC_S_INS);
1668 PFSYNC_UNLOCK(sc);
1669
1670 st->sync_updates = 0;
1671}
1672
1673static int
1674pfsync_defer(struct pf_state *st, struct mbuf *m)
1675{
1676 struct pfsync_softc *sc = V_pfsyncif;
1677 struct pfsync_deferral *pd;
1678
1679 if (m->m_flags & (M_BCAST|M_MCAST))
1680 return (0);
1681
1682 PFSYNC_LOCK(sc);
1683
1684 if (sc == NULL || !(sc->sc_ifp->if_flags & IFF_DRV_RUNNING) ||
1685 !(sc->sc_flags & PFSYNCF_DEFER)) {
1686 PFSYNC_UNLOCK(sc);
1687 return (0);
1688 }
1689
1690 if (sc->sc_deferred >= 128)
1691 pfsync_undefer(TAILQ_FIRST(&sc->sc_deferrals), 0);
1692
1693 pd = malloc(sizeof(*pd), M_PFSYNC, M_NOWAIT);
1694 if (pd == NULL)
1695 return (0);
1696 sc->sc_deferred++;
1697
1698 m->m_flags |= M_SKIP_FIREWALL;
1699 st->state_flags |= PFSTATE_ACK;
1700
1701 pd->pd_sc = sc;
1702 pd->pd_refs = 0;
1703 pd->pd_st = st;
1704 pf_ref_state(st);
1705 pd->pd_m = m;
1706
1707 TAILQ_INSERT_TAIL(&sc->sc_deferrals, pd, pd_entry);
1708 callout_init_mtx(&pd->pd_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED);
1709 callout_reset(&pd->pd_tmo, 10, pfsync_defer_tmo, pd);
1710
1711 pfsync_push(sc);
1712
1713 return (1);
1714}
1715
1716static void
1717pfsync_undefer(struct pfsync_deferral *pd, int drop)
1718{
1719 struct pfsync_softc *sc = pd->pd_sc;
1720 struct mbuf *m = pd->pd_m;
1721 struct pf_state *st = pd->pd_st;
1722
1723 PFSYNC_LOCK_ASSERT(sc);
1724
1725 TAILQ_REMOVE(&sc->sc_deferrals, pd, pd_entry);
1726 sc->sc_deferred--;
1727 pd->pd_st->state_flags &= ~PFSTATE_ACK; /* XXX: locking! */
1728 free(pd, M_PFSYNC);
1729 pf_release_state(st);
1730
1731 if (drop)
1732 m_freem(m);
1733 else {
1734 _IF_ENQUEUE(&sc->sc_ifp->if_snd, m);
1735 pfsync_push(sc);
1736 }
1737}
1738
1739static void
1740pfsync_defer_tmo(void *arg)
1741{
1742 struct pfsync_deferral *pd = arg;
1743 struct pfsync_softc *sc = pd->pd_sc;
1744 struct mbuf *m = pd->pd_m;
1745 struct pf_state *st = pd->pd_st;
1746
1747 PFSYNC_LOCK_ASSERT(sc);
1748
1749 CURVNET_SET(m->m_pkthdr.rcvif->if_vnet);
1750
1751 TAILQ_REMOVE(&sc->sc_deferrals, pd, pd_entry);
1752 sc->sc_deferred--;
1753 pd->pd_st->state_flags &= ~PFSTATE_ACK; /* XXX: locking! */
1754 if (pd->pd_refs == 0)
1755 free(pd, M_PFSYNC);
1756 PFSYNC_UNLOCK(sc);
1757
1758 ip_output(m, NULL, NULL, 0, NULL, NULL);
1759
1760 pf_release_state(st);
1761
1762 CURVNET_RESTORE();
1763}
1764
1765static void
1766pfsync_undefer_state(struct pf_state *st, int drop)
1767{
1768 struct pfsync_softc *sc = V_pfsyncif;
1769 struct pfsync_deferral *pd;
1770
1771 PFSYNC_LOCK_ASSERT(sc);
1772
1773 TAILQ_FOREACH(pd, &sc->sc_deferrals, pd_entry) {
1774 if (pd->pd_st == st) {
1775 if (callout_stop(&pd->pd_tmo))
1776 pfsync_undefer(pd, drop);
1777 return;
1778 }
1779 }
1780
1781 panic("%s: unable to find deferred state", __func__);
1782}
1783
1784static void
1785pfsync_update_state(struct pf_state *st)
1786{
1787 struct pfsync_softc *sc = V_pfsyncif;
1788 int sync = 0;
1789
1790 PF_STATE_LOCK_ASSERT(st);
1791 PFSYNC_LOCK(sc);
1792
1793 if (st->state_flags & PFSTATE_ACK)
1794 pfsync_undefer_state(st, 0);
1795 if (st->state_flags & PFSTATE_NOSYNC) {
1796 if (st->sync_state != PFSYNC_S_NONE)
1797 pfsync_q_del(st);
1798 PFSYNC_UNLOCK(sc);
1799 return;
1800 }
1801
1802 if (sc->sc_len == PFSYNC_MINPKT)
1803 callout_reset(&sc->sc_tmo, 1 * hz, pfsync_timeout, V_pfsyncif);
1804
1805 switch (st->sync_state) {
1806 case PFSYNC_S_UPD_C:
1807 case PFSYNC_S_UPD:
1808 case PFSYNC_S_INS:
1809 /* we're already handling it */
1810
1811 if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP) {
1812 st->sync_updates++;
1813 if (st->sync_updates >= sc->sc_maxupdates)
1814 sync = 1;
1815 }
1816 break;
1817
1818 case PFSYNC_S_IACK:
1819 pfsync_q_del(st);
1820 case PFSYNC_S_NONE:
1821 pfsync_q_ins(st, PFSYNC_S_UPD_C);
1822 st->sync_updates = 0;
1823 break;
1824
1825 default:
1826 panic("%s: unexpected sync state %d", __func__, st->sync_state);
1827 }
1828
1829 if (sync || (time_uptime - st->pfsync_time) < 2)
1830 pfsync_push(sc);
1831
1832 PFSYNC_UNLOCK(sc);
1833}
1834
1835static void
1836pfsync_request_update(u_int32_t creatorid, u_int64_t id)
1837{
1838 struct pfsync_softc *sc = V_pfsyncif;
1839 struct pfsync_upd_req_item *item;
1840 size_t nlen = sizeof(struct pfsync_upd_req);
1841
1842 PFSYNC_LOCK_ASSERT(sc);
1843
1844 /*
1845 * This code does a bit to prevent multiple update requests for the
1846 * same state being generated. It searches current subheader queue,
1847 * but it doesn't lookup into queue of already packed datagrams.
1848 */
1849 TAILQ_FOREACH(item, &sc->sc_upd_req_list, ur_entry)
1850 if (item->ur_msg.id == id &&
1851 item->ur_msg.creatorid == creatorid)
1852 return;
1853
1854 item = malloc(sizeof(*item), M_PFSYNC, M_NOWAIT);
1855 if (item == NULL)
1856 return; /* XXX stats */
1857
1858 item->ur_msg.id = id;
1859 item->ur_msg.creatorid = creatorid;
1860
1861 if (TAILQ_EMPTY(&sc->sc_upd_req_list))
1862 nlen += sizeof(struct pfsync_subheader);
1863
1864 if (sc->sc_len + nlen > sc->sc_ifp->if_mtu) {
1865 pfsync_sendout(1);
1866
1867 nlen = sizeof(struct pfsync_subheader) +
1868 sizeof(struct pfsync_upd_req);
1869 }
1870
1871 TAILQ_INSERT_TAIL(&sc->sc_upd_req_list, item, ur_entry);
1872 sc->sc_len += nlen;
1873}
1874
1875static void
1876pfsync_update_state_req(struct pf_state *st)
1877{
1878 struct pfsync_softc *sc = V_pfsyncif;
1879
1880 PF_STATE_LOCK_ASSERT(st);
1881 PFSYNC_LOCK(sc);
1882
1883 if (st->state_flags & PFSTATE_NOSYNC) {
1884 if (st->sync_state != PFSYNC_S_NONE)
1885 pfsync_q_del(st);
1886 PFSYNC_UNLOCK(sc);
1887 return;
1888 }
1889
1890 switch (st->sync_state) {
1891 case PFSYNC_S_UPD_C:
1892 case PFSYNC_S_IACK:
1893 pfsync_q_del(st);
1894 case PFSYNC_S_NONE:
1895 pfsync_q_ins(st, PFSYNC_S_UPD);
1896 pfsync_push(sc);
1897 break;
1898
1899 case PFSYNC_S_INS:
1900 case PFSYNC_S_UPD:
1901 case PFSYNC_S_DEL:
1902 /* we're already handling it */
1903 break;
1904
1905 default:
1906 panic("%s: unexpected sync state %d", __func__, st->sync_state);
1907 }
1908
1909 PFSYNC_UNLOCK(sc);
1910}
1911
1912static void
1913pfsync_delete_state(struct pf_state *st)
1914{
1915 struct pfsync_softc *sc = V_pfsyncif;
1916
1917 PFSYNC_LOCK(sc);
1918 if (st->state_flags & PFSTATE_ACK)
1919 pfsync_undefer_state(st, 1);
1920 if (st->state_flags & PFSTATE_NOSYNC) {
1921 if (st->sync_state != PFSYNC_S_NONE)
1922 pfsync_q_del(st);
1923 PFSYNC_UNLOCK(sc);
1924 return;
1925 }
1926
1927 if (sc->sc_len == PFSYNC_MINPKT)
1928 callout_reset(&sc->sc_tmo, 1 * hz, pfsync_timeout, V_pfsyncif);
1929
1930 switch (st->sync_state) {
1931 case PFSYNC_S_INS:
1932 /* We never got to tell the world so just forget about it. */
1933 pfsync_q_del(st);
1934 break;
1935
1936 case PFSYNC_S_UPD_C:
1937 case PFSYNC_S_UPD:
1938 case PFSYNC_S_IACK:
1939 pfsync_q_del(st);
1940 /* FALLTHROUGH to putting it on the del list */
1941
1942 case PFSYNC_S_NONE:
1943 pfsync_q_ins(st, PFSYNC_S_DEL);
1944 break;
1945
1946 default:
1947 panic("%s: unexpected sync state %d", __func__, st->sync_state);
1948 }
1949 PFSYNC_UNLOCK(sc);
1950}
1951
1952static void
1953pfsync_clear_states(u_int32_t creatorid, const char *ifname)
1954{
1955 struct pfsync_softc *sc = V_pfsyncif;
1956 struct {
1957 struct pfsync_subheader subh;
1958 struct pfsync_clr clr;
1959 } __packed r;
1960
1961 bzero(&r, sizeof(r));
1962
1963 r.subh.action = PFSYNC_ACT_CLR;
1964 r.subh.count = htons(1);
1965 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_CLR]++;
1966
1967 strlcpy(r.clr.ifname, ifname, sizeof(r.clr.ifname));
1968 r.clr.creatorid = creatorid;
1969
1970 PFSYNC_LOCK(sc);
1971 pfsync_send_plus(&r, sizeof(r));
1972 PFSYNC_UNLOCK(sc);
1973}
1974
1975static void
1976pfsync_q_ins(struct pf_state *st, int q)
1977{
1978 struct pfsync_softc *sc = V_pfsyncif;
1979 size_t nlen = pfsync_qs[q].len;
1980
1981 PFSYNC_LOCK_ASSERT(sc);
1982
1983 KASSERT(st->sync_state == PFSYNC_S_NONE,
1984 ("%s: st->sync_state %u", __func__, st->sync_state));
1985 KASSERT(sc->sc_len >= PFSYNC_MINPKT, ("pfsync pkt len is too low %zu",
1986 sc->sc_len));
1987
1988 if (TAILQ_EMPTY(&sc->sc_qs[q]))
1989 nlen += sizeof(struct pfsync_subheader);
1990
1991 if (sc->sc_len + nlen > sc->sc_ifp->if_mtu) {
1992 pfsync_sendout(1);
1993
1994 nlen = sizeof(struct pfsync_subheader) + pfsync_qs[q].len;
1995 }
1996
1997 sc->sc_len += nlen;
1998 TAILQ_INSERT_TAIL(&sc->sc_qs[q], st, sync_list);
1999 st->sync_state = q;
2000 pf_ref_state(st);
2001}
2002
2003static void
2004pfsync_q_del(struct pf_state *st)
2005{
2006 struct pfsync_softc *sc = V_pfsyncif;
2007 int q = st->sync_state;
2008
2009 PFSYNC_LOCK_ASSERT(sc);
2010 KASSERT(st->sync_state != PFSYNC_S_NONE,
2011 ("%s: st->sync_state != PFSYNC_S_NONE", __func__));
2012
2013 sc->sc_len -= pfsync_qs[q].len;
2014 TAILQ_REMOVE(&sc->sc_qs[q], st, sync_list);
2015 st->sync_state = PFSYNC_S_NONE;
2016 pf_release_state(st);
2017
2018 if (TAILQ_EMPTY(&sc->sc_qs[q]))
2019 sc->sc_len -= sizeof(struct pfsync_subheader);
2020}
2021
2022static void
2023pfsync_bulk_start(void)
2024{
2025 struct pfsync_softc *sc = V_pfsyncif;
2026
2027 if (V_pf_status.debug >= PF_DEBUG_MISC)
2028 printf("pfsync: received bulk update request\n");
2029
2030 PFSYNC_BLOCK(sc);
2031
2032 sc->sc_ureq_received = time_uptime;
2033 sc->sc_bulk_hashid = 0;
2034 sc->sc_bulk_stateid = 0;
2035 pfsync_bulk_status(PFSYNC_BUS_START);
2036 callout_reset(&sc->sc_bulk_tmo, 1, pfsync_bulk_update, sc);
2037 PFSYNC_BUNLOCK(sc);
2038}
2039
2040static void
2041pfsync_bulk_update(void *arg)
2042{
2043 struct pfsync_softc *sc = arg;
2044 struct pf_state *s;
2045 int i, sent = 0;
2046
2047 PFSYNC_BLOCK_ASSERT(sc);
2048 CURVNET_SET(sc->sc_ifp->if_vnet);
2049
2050 /*
2051 * Start with last state from previous invocation.
2052 * It may had gone, in this case start from the
2053 * hash slot.
2054 */
2055 s = pf_find_state_byid(sc->sc_bulk_stateid, sc->sc_bulk_creatorid);
2056
2057 if (s != NULL)
2058 i = PF_IDHASH(s);
2059 else
2060 i = sc->sc_bulk_hashid;
2061
2062 for (; i <= pf_hashmask; i++) {
2063 struct pf_idhash *ih = &V_pf_idhash[i];
2064
2065 if (s != NULL)
2066 PF_HASHROW_ASSERT(ih);
2067 else {
2068 PF_HASHROW_LOCK(ih);
2069 s = LIST_FIRST(&ih->states);
2070 }
2071
2072 for (; s; s = LIST_NEXT(s, entry)) {
2073
2074 if (sent > 1 && (sc->sc_ifp->if_mtu - sc->sc_len) <
2075 sizeof(struct pfsync_state)) {
2076 /* We've filled a packet. */
2077 sc->sc_bulk_hashid = i;
2078 sc->sc_bulk_stateid = s->id;
2079 sc->sc_bulk_creatorid = s->creatorid;
2080 PF_HASHROW_UNLOCK(ih);
2081 callout_reset(&sc->sc_bulk_tmo, 1,
2082 pfsync_bulk_update, sc);
2083 goto full;
2084 }
2085
2086 if (s->sync_state == PFSYNC_S_NONE &&
2087 s->timeout < PFTM_MAX &&
2088 s->pfsync_time <= sc->sc_ureq_received) {
2089 pfsync_update_state_req(s);
2090 sent++;
2091 }
2092 }
2093 PF_HASHROW_UNLOCK(ih);
2094 }
2095
2096 /* We're done. */
2097 pfsync_bulk_status(PFSYNC_BUS_END);
2098
2099full:
2100 CURVNET_RESTORE();
2101}
2102
2103static void
2104pfsync_bulk_status(u_int8_t status)
2105{
2106 struct {
2107 struct pfsync_subheader subh;
2108 struct pfsync_bus bus;
2109 } __packed r;
2110
2111 struct pfsync_softc *sc = V_pfsyncif;
2112
2113 bzero(&r, sizeof(r));
2114
2115 r.subh.action = PFSYNC_ACT_BUS;
2116 r.subh.count = htons(1);
2117 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_BUS]++;
2118
2119 r.bus.creatorid = V_pf_status.hostid;
2120 r.bus.endtime = htonl(time_uptime - sc->sc_ureq_received);
2121 r.bus.status = status;
2122
2123 PFSYNC_LOCK(sc);
2124 pfsync_send_plus(&r, sizeof(r));
2125 PFSYNC_UNLOCK(sc);
2126}
2127
2128static void
2129pfsync_bulk_fail(void *arg)
2130{
2131 struct pfsync_softc *sc = arg;
2132
2133 CURVNET_SET(sc->sc_ifp->if_vnet);
2134
2135 PFSYNC_BLOCK_ASSERT(sc);
2136
2137 if (sc->sc_bulk_tries++ < PFSYNC_MAX_BULKTRIES) {
2138 /* Try again */
2139 callout_reset(&sc->sc_bulkfail_tmo, 5 * hz,
2140 pfsync_bulk_fail, V_pfsyncif);
2141 PFSYNC_LOCK(sc);
2142 pfsync_request_update(0, 0);
2143 PFSYNC_UNLOCK(sc);
2144 } else {
2145 /* Pretend like the transfer was ok. */
2146 sc->sc_ureq_sent = 0;
2147 sc->sc_bulk_tries = 0;
2148 PFSYNC_LOCK(sc);
2149 if (!(sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p)
2150 (*carp_demote_adj_p)(-V_pfsync_carp_adj,
2151 "pfsync bulk fail");
2152 sc->sc_flags |= PFSYNCF_OK;
2153 PFSYNC_UNLOCK(sc);
2154 if (V_pf_status.debug >= PF_DEBUG_MISC)
2155 printf("pfsync: failed to receive bulk update\n");
2156 }
2157
2158 CURVNET_RESTORE();
2159}
2160
2161static void
2162pfsync_send_plus(void *plus, size_t pluslen)
2163{
2164 struct pfsync_softc *sc = V_pfsyncif;
2165
2166 PFSYNC_LOCK_ASSERT(sc);
2167
2168 if (sc->sc_len + pluslen > sc->sc_ifp->if_mtu)
2169 pfsync_sendout(1);
2170
2171 sc->sc_plus = plus;
2172 sc->sc_len += (sc->sc_pluslen = pluslen);
2173
2174 pfsync_sendout(1);
2175}
2176
2177static void
2178pfsync_timeout(void *arg)
2179{
2180 struct pfsync_softc *sc = arg;
2181
2182 CURVNET_SET(sc->sc_ifp->if_vnet);
2183 PFSYNC_LOCK(sc);
2184 pfsync_push(sc);
2185 PFSYNC_UNLOCK(sc);
2186 CURVNET_RESTORE();
2187}
2188
2189static void
2190pfsync_push(struct pfsync_softc *sc)
2191{
2192
2193 PFSYNC_LOCK_ASSERT(sc);
2194
2195 sc->sc_flags |= PFSYNCF_PUSH;
2196 swi_sched(V_pfsync_swi_cookie, 0);
2197}
2198
2199static void
2200pfsyncintr(void *arg)
2201{
2202 struct pfsync_softc *sc = arg;
2203 struct mbuf *m, *n;
2204
2205 CURVNET_SET(sc->sc_ifp->if_vnet);
2206
2207 PFSYNC_LOCK(sc);
2208 if ((sc->sc_flags & PFSYNCF_PUSH) && sc->sc_len > PFSYNC_MINPKT) {
2209 pfsync_sendout(0);
2210 sc->sc_flags &= ~PFSYNCF_PUSH;
2211 }
2212 _IF_DEQUEUE_ALL(&sc->sc_ifp->if_snd, m);
2213 PFSYNC_UNLOCK(sc);
2214
2215 for (; m != NULL; m = n) {
2216
2217 n = m->m_nextpkt;
2218 m->m_nextpkt = NULL;
2219
2220 /*
2221 * We distinguish between a deferral packet and our
2222 * own pfsync packet based on M_SKIP_FIREWALL
2223 * flag. This is XXX.
2224 */
2225 if (m->m_flags & M_SKIP_FIREWALL)
2226 ip_output(m, NULL, NULL, 0, NULL, NULL);
2227 else if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo,
2228 NULL) == 0)
2229 V_pfsyncstats.pfsyncs_opackets++;
2230 else
2231 V_pfsyncstats.pfsyncs_oerrors++;
2232 }
2233 CURVNET_RESTORE();
2234}
2235
2236static int
2237pfsync_multicast_setup(struct pfsync_softc *sc, struct ifnet *ifp, void *mship)
2238{
2239 struct ip_moptions *imo = &sc->sc_imo;
2240 int error;
2241
2242 if (!(ifp->if_flags & IFF_MULTICAST))
2243 return (EADDRNOTAVAIL);
2244
2245 imo->imo_membership = (struct in_multi **)mship;
2246 imo->imo_max_memberships = IP_MIN_MEMBERSHIPS;
2247 imo->imo_multicast_vif = -1;
2248
2249 if ((error = in_joingroup(ifp, &sc->sc_sync_peer, NULL,
2250 &imo->imo_membership[0])) != 0) {
2251 imo->imo_membership = NULL;
2252 return (error);
2253 }
2254 imo->imo_num_memberships++;
2255 imo->imo_multicast_ifp = ifp;
2256 imo->imo_multicast_ttl = PFSYNC_DFLTTL;
2257 imo->imo_multicast_loop = 0;
2258
2259 return (0);
2260}
2261
2262static void
2263pfsync_multicast_cleanup(struct pfsync_softc *sc)
2264{
2265 struct ip_moptions *imo = &sc->sc_imo;
2266
2267 in_leavegroup(imo->imo_membership[0], NULL);
2268 free(imo->imo_membership, M_PFSYNC);
2269 imo->imo_membership = NULL;
2270 imo->imo_multicast_ifp = NULL;
2271}
2272
2273#ifdef INET
2274extern struct domain inetdomain;
2275static struct protosw in_pfsync_protosw = {
2276 .pr_type = SOCK_RAW,
2277 .pr_domain = &inetdomain,
2278 .pr_protocol = IPPROTO_PFSYNC,
2279 .pr_flags = PR_ATOMIC|PR_ADDR,
2280 .pr_input = pfsync_input,
2281 .pr_output = (pr_output_t *)rip_output,
2282 .pr_ctloutput = rip_ctloutput,
2283 .pr_usrreqs = &rip_usrreqs
2284};
2285#endif
2286
2287static void
2288pfsync_pointers_init()
2289{
2290
2291 PF_RULES_WLOCK();
2292 pfsync_state_import_ptr = pfsync_state_import;
2293 pfsync_insert_state_ptr = pfsync_insert_state;
2294 pfsync_update_state_ptr = pfsync_update_state;
2295 pfsync_delete_state_ptr = pfsync_delete_state;
2296 pfsync_clear_states_ptr = pfsync_clear_states;
2297 pfsync_defer_ptr = pfsync_defer;
2298 PF_RULES_WUNLOCK();
2299}
2300
2301static void
2302pfsync_pointers_uninit()
2303{
2304
2305 PF_RULES_WLOCK();
2306 pfsync_state_import_ptr = NULL;
2307 pfsync_insert_state_ptr = NULL;
2308 pfsync_update_state_ptr = NULL;
2309 pfsync_delete_state_ptr = NULL;
2310 pfsync_clear_states_ptr = NULL;
2311 pfsync_defer_ptr = NULL;
2312 PF_RULES_WUNLOCK();
2313}
2314
2315static int
2316pfsync_init()
2317{
2318 VNET_ITERATOR_DECL(vnet_iter);
2319 int error = 0;
2320
2321 VNET_LIST_RLOCK();
2322 VNET_FOREACH(vnet_iter) {
2323 CURVNET_SET(vnet_iter);
2324 V_pfsync_cloner = if_clone_simple(pfsyncname,
2325 pfsync_clone_create, pfsync_clone_destroy, 1);
2326 error = swi_add(NULL, pfsyncname, pfsyncintr, V_pfsyncif,
2327 SWI_NET, INTR_MPSAFE, &V_pfsync_swi_cookie);
2328 CURVNET_RESTORE();
2329 if (error)
2330 goto fail_locked;
2331 }
2332 VNET_LIST_RUNLOCK();
2333#ifdef INET
2334 error = pf_proto_register(PF_INET, &in_pfsync_protosw);
2335 if (error)
2336 goto fail;
2337 error = ipproto_register(IPPROTO_PFSYNC);
2338 if (error) {
2339 pf_proto_unregister(PF_INET, IPPROTO_PFSYNC, SOCK_RAW);
2340 goto fail;
2341 }
2342#endif
2343 pfsync_pointers_init();
2344
2345 return (0);
2346
2347fail:
2348 VNET_LIST_RLOCK();
2349fail_locked:
2350 VNET_FOREACH(vnet_iter) {
2351 CURVNET_SET(vnet_iter);
2352 if (V_pfsync_swi_cookie) {
2353 swi_remove(V_pfsync_swi_cookie);
2354 if_clone_detach(V_pfsync_cloner);
2355 }
2356 CURVNET_RESTORE();
2357 }
2358 VNET_LIST_RUNLOCK();
2359
2360 return (error);
2361}
2362
2363static void
2364pfsync_uninit()
2365{
2366 VNET_ITERATOR_DECL(vnet_iter);
2367
2368 pfsync_pointers_uninit();
2369
2370 ipproto_unregister(IPPROTO_PFSYNC);
2371 pf_proto_unregister(PF_INET, IPPROTO_PFSYNC, SOCK_RAW);
2372 VNET_LIST_RLOCK();
2373 VNET_FOREACH(vnet_iter) {
2374 CURVNET_SET(vnet_iter);
2375 if_clone_detach(V_pfsync_cloner);
2376 swi_remove(V_pfsync_swi_cookie);
2377 CURVNET_RESTORE();
2378 }
2379 VNET_LIST_RUNLOCK();
2380}
2381
2382static int
2383pfsync_modevent(module_t mod, int type, void *data)
2384{
2385 int error = 0;
2386
2387 switch (type) {
2388 case MOD_LOAD:
2389 error = pfsync_init();
2390 break;
2391 case MOD_QUIESCE:
2392 /*
2393 * Module should not be unloaded due to race conditions.
2394 */
2395 error = EBUSY;
2396 break;
2397 case MOD_UNLOAD:
2398 pfsync_uninit();
2399 break;
2400 default:
2401 error = EINVAL;
2402 break;
2403 }
2404
2405 return (error);
2406}
2407
2408static moduledata_t pfsync_mod = {
2409 pfsyncname,
2410 pfsync_modevent,
2411 0
2412};
2413
2414#define PFSYNC_MODVER 1
2415
2416DECLARE_MODULE(pfsync, pfsync_mod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);
2417MODULE_VERSION(pfsync, PFSYNC_MODVER);
2418MODULE_DEPEND(pfsync, pf, PF_MODVER, PF_MODVER, PF_MODVER);
| 675}
676
677static int
678pfsync_in_clr(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
679{
680 struct pfsync_clr *clr;
681 struct mbuf *mp;
682 int len = sizeof(*clr) * count;
683 int i, offp;
684 u_int32_t creatorid;
685
686 mp = m_pulldown(m, offset, len, &offp);
687 if (mp == NULL) {
688 V_pfsyncstats.pfsyncs_badlen++;
689 return (-1);
690 }
691 clr = (struct pfsync_clr *)(mp->m_data + offp);
692
693 for (i = 0; i < count; i++) {
694 creatorid = clr[i].creatorid;
695
696 if (clr[i].ifname[0] != '\0' &&
697 pfi_kif_find(clr[i].ifname) == NULL)
698 continue;
699
700 for (int i = 0; i <= pf_hashmask; i++) {
701 struct pf_idhash *ih = &V_pf_idhash[i];
702 struct pf_state *s;
703relock:
704 PF_HASHROW_LOCK(ih);
705 LIST_FOREACH(s, &ih->states, entry) {
706 if (s->creatorid == creatorid) {
707 s->state_flags |= PFSTATE_NOSYNC;
708 pf_unlink_state(s, PF_ENTER_LOCKED);
709 goto relock;
710 }
711 }
712 PF_HASHROW_UNLOCK(ih);
713 }
714 }
715
716 return (len);
717}
718
719static int
720pfsync_in_ins(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
721{
722 struct mbuf *mp;
723 struct pfsync_state *sa, *sp;
724 int len = sizeof(*sp) * count;
725 int i, offp;
726
727 mp = m_pulldown(m, offset, len, &offp);
728 if (mp == NULL) {
729 V_pfsyncstats.pfsyncs_badlen++;
730 return (-1);
731 }
732 sa = (struct pfsync_state *)(mp->m_data + offp);
733
734 for (i = 0; i < count; i++) {
735 sp = &sa[i];
736
737 /* Check for invalid values. */
738 if (sp->timeout >= PFTM_MAX ||
739 sp->src.state > PF_TCPS_PROXY_DST ||
740 sp->dst.state > PF_TCPS_PROXY_DST ||
741 sp->direction > PF_OUT ||
742 (sp->af != AF_INET && sp->af != AF_INET6)) {
743 if (V_pf_status.debug >= PF_DEBUG_MISC)
744 printf("%s: invalid value\n", __func__);
745 V_pfsyncstats.pfsyncs_badval++;
746 continue;
747 }
748
749 if (pfsync_state_import(sp, pkt->flags) == ENOMEM)
750 /* Drop out, but process the rest of the actions. */
751 break;
752 }
753
754 return (len);
755}
756
757static int
758pfsync_in_iack(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
759{
760 struct pfsync_ins_ack *ia, *iaa;
761 struct pf_state *st;
762
763 struct mbuf *mp;
764 int len = count * sizeof(*ia);
765 int offp, i;
766
767 mp = m_pulldown(m, offset, len, &offp);
768 if (mp == NULL) {
769 V_pfsyncstats.pfsyncs_badlen++;
770 return (-1);
771 }
772 iaa = (struct pfsync_ins_ack *)(mp->m_data + offp);
773
774 for (i = 0; i < count; i++) {
775 ia = &iaa[i];
776
777 st = pf_find_state_byid(ia->id, ia->creatorid);
778 if (st == NULL)
779 continue;
780
781 if (st->state_flags & PFSTATE_ACK) {
782 PFSYNC_LOCK(V_pfsyncif);
783 pfsync_undefer_state(st, 0);
784 PFSYNC_UNLOCK(V_pfsyncif);
785 }
786 PF_STATE_UNLOCK(st);
787 }
788 /*
789 * XXX this is not yet implemented, but we know the size of the
790 * message so we can skip it.
791 */
792
793 return (count * sizeof(struct pfsync_ins_ack));
794}
795
796static int
797pfsync_upd_tcp(struct pf_state *st, struct pfsync_state_peer *src,
798 struct pfsync_state_peer *dst)
799{
800 int sync = 0;
801
802 PF_STATE_LOCK_ASSERT(st);
803
804 /*
805 * The state should never go backwards except
806 * for syn-proxy states. Neither should the
807 * sequence window slide backwards.
808 */
809 if ((st->src.state > src->state &&
810 (st->src.state < PF_TCPS_PROXY_SRC ||
811 src->state >= PF_TCPS_PROXY_SRC)) ||
812
813 (st->src.state == src->state &&
814 SEQ_GT(st->src.seqlo, ntohl(src->seqlo))))
815 sync++;
816 else
817 pf_state_peer_ntoh(src, &st->src);
818
819 if ((st->dst.state > dst->state) ||
820
821 (st->dst.state >= TCPS_SYN_SENT &&
822 SEQ_GT(st->dst.seqlo, ntohl(dst->seqlo))))
823 sync++;
824 else
825 pf_state_peer_ntoh(dst, &st->dst);
826
827 return (sync);
828}
829
830static int
831pfsync_in_upd(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
832{
833 struct pfsync_softc *sc = V_pfsyncif;
834 struct pfsync_state *sa, *sp;
835 struct pf_state *st;
836 int sync;
837
838 struct mbuf *mp;
839 int len = count * sizeof(*sp);
840 int offp, i;
841
842 mp = m_pulldown(m, offset, len, &offp);
843 if (mp == NULL) {
844 V_pfsyncstats.pfsyncs_badlen++;
845 return (-1);
846 }
847 sa = (struct pfsync_state *)(mp->m_data + offp);
848
849 for (i = 0; i < count; i++) {
850 sp = &sa[i];
851
852 /* check for invalid values */
853 if (sp->timeout >= PFTM_MAX ||
854 sp->src.state > PF_TCPS_PROXY_DST ||
855 sp->dst.state > PF_TCPS_PROXY_DST) {
856 if (V_pf_status.debug >= PF_DEBUG_MISC) {
857 printf("pfsync_input: PFSYNC_ACT_UPD: "
858 "invalid value\n");
859 }
860 V_pfsyncstats.pfsyncs_badval++;
861 continue;
862 }
863
864 st = pf_find_state_byid(sp->id, sp->creatorid);
865 if (st == NULL) {
866 /* insert the update */
867 if (pfsync_state_import(sp, 0))
868 V_pfsyncstats.pfsyncs_badstate++;
869 continue;
870 }
871
872 if (st->state_flags & PFSTATE_ACK) {
873 PFSYNC_LOCK(sc);
874 pfsync_undefer_state(st, 1);
875 PFSYNC_UNLOCK(sc);
876 }
877
878 if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP)
879 sync = pfsync_upd_tcp(st, &sp->src, &sp->dst);
880 else {
881 sync = 0;
882
883 /*
884 * Non-TCP protocol state machine always go
885 * forwards
886 */
887 if (st->src.state > sp->src.state)
888 sync++;
889 else
890 pf_state_peer_ntoh(&sp->src, &st->src);
891 if (st->dst.state > sp->dst.state)
892 sync++;
893 else
894 pf_state_peer_ntoh(&sp->dst, &st->dst);
895 }
896 if (sync < 2) {
897 pfsync_alloc_scrub_memory(&sp->dst, &st->dst);
898 pf_state_peer_ntoh(&sp->dst, &st->dst);
899 st->expire = time_uptime;
900 st->timeout = sp->timeout;
901 }
902 st->pfsync_time = time_uptime;
903
904 if (sync) {
905 V_pfsyncstats.pfsyncs_stale++;
906
907 pfsync_update_state(st);
908 PF_STATE_UNLOCK(st);
909 PFSYNC_LOCK(sc);
910 pfsync_push(sc);
911 PFSYNC_UNLOCK(sc);
912 continue;
913 }
914 PF_STATE_UNLOCK(st);
915 }
916
917 return (len);
918}
919
920static int
921pfsync_in_upd_c(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
922{
923 struct pfsync_softc *sc = V_pfsyncif;
924 struct pfsync_upd_c *ua, *up;
925 struct pf_state *st;
926 int len = count * sizeof(*up);
927 int sync;
928 struct mbuf *mp;
929 int offp, i;
930
931 mp = m_pulldown(m, offset, len, &offp);
932 if (mp == NULL) {
933 V_pfsyncstats.pfsyncs_badlen++;
934 return (-1);
935 }
936 ua = (struct pfsync_upd_c *)(mp->m_data + offp);
937
938 for (i = 0; i < count; i++) {
939 up = &ua[i];
940
941 /* check for invalid values */
942 if (up->timeout >= PFTM_MAX ||
943 up->src.state > PF_TCPS_PROXY_DST ||
944 up->dst.state > PF_TCPS_PROXY_DST) {
945 if (V_pf_status.debug >= PF_DEBUG_MISC) {
946 printf("pfsync_input: "
947 "PFSYNC_ACT_UPD_C: "
948 "invalid value\n");
949 }
950 V_pfsyncstats.pfsyncs_badval++;
951 continue;
952 }
953
954 st = pf_find_state_byid(up->id, up->creatorid);
955 if (st == NULL) {
956 /* We don't have this state. Ask for it. */
957 PFSYNC_LOCK(sc);
958 pfsync_request_update(up->creatorid, up->id);
959 PFSYNC_UNLOCK(sc);
960 continue;
961 }
962
963 if (st->state_flags & PFSTATE_ACK) {
964 PFSYNC_LOCK(sc);
965 pfsync_undefer_state(st, 1);
966 PFSYNC_UNLOCK(sc);
967 }
968
969 if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP)
970 sync = pfsync_upd_tcp(st, &up->src, &up->dst);
971 else {
972 sync = 0;
973
974 /*
975 * Non-TCP protocol state machine always go
976 * forwards
977 */
978 if (st->src.state > up->src.state)
979 sync++;
980 else
981 pf_state_peer_ntoh(&up->src, &st->src);
982 if (st->dst.state > up->dst.state)
983 sync++;
984 else
985 pf_state_peer_ntoh(&up->dst, &st->dst);
986 }
987 if (sync < 2) {
988 pfsync_alloc_scrub_memory(&up->dst, &st->dst);
989 pf_state_peer_ntoh(&up->dst, &st->dst);
990 st->expire = time_uptime;
991 st->timeout = up->timeout;
992 }
993 st->pfsync_time = time_uptime;
994
995 if (sync) {
996 V_pfsyncstats.pfsyncs_stale++;
997
998 pfsync_update_state(st);
999 PF_STATE_UNLOCK(st);
1000 PFSYNC_LOCK(sc);
1001 pfsync_push(sc);
1002 PFSYNC_UNLOCK(sc);
1003 continue;
1004 }
1005 PF_STATE_UNLOCK(st);
1006 }
1007
1008 return (len);
1009}
1010
1011static int
1012pfsync_in_ureq(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
1013{
1014 struct pfsync_upd_req *ur, *ura;
1015 struct mbuf *mp;
1016 int len = count * sizeof(*ur);
1017 int i, offp;
1018
1019 struct pf_state *st;
1020
1021 mp = m_pulldown(m, offset, len, &offp);
1022 if (mp == NULL) {
1023 V_pfsyncstats.pfsyncs_badlen++;
1024 return (-1);
1025 }
1026 ura = (struct pfsync_upd_req *)(mp->m_data + offp);
1027
1028 for (i = 0; i < count; i++) {
1029 ur = &ura[i];
1030
1031 if (ur->id == 0 && ur->creatorid == 0)
1032 pfsync_bulk_start();
1033 else {
1034 st = pf_find_state_byid(ur->id, ur->creatorid);
1035 if (st == NULL) {
1036 V_pfsyncstats.pfsyncs_badstate++;
1037 continue;
1038 }
1039 if (st->state_flags & PFSTATE_NOSYNC) {
1040 PF_STATE_UNLOCK(st);
1041 continue;
1042 }
1043
1044 pfsync_update_state_req(st);
1045 PF_STATE_UNLOCK(st);
1046 }
1047 }
1048
1049 return (len);
1050}
1051
1052static int
1053pfsync_in_del(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
1054{
1055 struct mbuf *mp;
1056 struct pfsync_state *sa, *sp;
1057 struct pf_state *st;
1058 int len = count * sizeof(*sp);
1059 int offp, i;
1060
1061 mp = m_pulldown(m, offset, len, &offp);
1062 if (mp == NULL) {
1063 V_pfsyncstats.pfsyncs_badlen++;
1064 return (-1);
1065 }
1066 sa = (struct pfsync_state *)(mp->m_data + offp);
1067
1068 for (i = 0; i < count; i++) {
1069 sp = &sa[i];
1070
1071 st = pf_find_state_byid(sp->id, sp->creatorid);
1072 if (st == NULL) {
1073 V_pfsyncstats.pfsyncs_badstate++;
1074 continue;
1075 }
1076 st->state_flags |= PFSTATE_NOSYNC;
1077 pf_unlink_state(st, PF_ENTER_LOCKED);
1078 }
1079
1080 return (len);
1081}
1082
1083static int
1084pfsync_in_del_c(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
1085{
1086 struct mbuf *mp;
1087 struct pfsync_del_c *sa, *sp;
1088 struct pf_state *st;
1089 int len = count * sizeof(*sp);
1090 int offp, i;
1091
1092 mp = m_pulldown(m, offset, len, &offp);
1093 if (mp == NULL) {
1094 V_pfsyncstats.pfsyncs_badlen++;
1095 return (-1);
1096 }
1097 sa = (struct pfsync_del_c *)(mp->m_data + offp);
1098
1099 for (i = 0; i < count; i++) {
1100 sp = &sa[i];
1101
1102 st = pf_find_state_byid(sp->id, sp->creatorid);
1103 if (st == NULL) {
1104 V_pfsyncstats.pfsyncs_badstate++;
1105 continue;
1106 }
1107
1108 st->state_flags |= PFSTATE_NOSYNC;
1109 pf_unlink_state(st, PF_ENTER_LOCKED);
1110 }
1111
1112 return (len);
1113}
1114
1115static int
1116pfsync_in_bus(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
1117{
1118 struct pfsync_softc *sc = V_pfsyncif;
1119 struct pfsync_bus *bus;
1120 struct mbuf *mp;
1121 int len = count * sizeof(*bus);
1122 int offp;
1123
1124 PFSYNC_BLOCK(sc);
1125
1126 /* If we're not waiting for a bulk update, who cares. */
1127 if (sc->sc_ureq_sent == 0) {
1128 PFSYNC_BUNLOCK(sc);
1129 return (len);
1130 }
1131
1132 mp = m_pulldown(m, offset, len, &offp);
1133 if (mp == NULL) {
1134 PFSYNC_BUNLOCK(sc);
1135 V_pfsyncstats.pfsyncs_badlen++;
1136 return (-1);
1137 }
1138 bus = (struct pfsync_bus *)(mp->m_data + offp);
1139
1140 switch (bus->status) {
1141 case PFSYNC_BUS_START:
1142 callout_reset(&sc->sc_bulkfail_tmo, 4 * hz +
1143 V_pf_limits[PF_LIMIT_STATES].limit /
1144 ((sc->sc_ifp->if_mtu - PFSYNC_MINPKT) /
1145 sizeof(struct pfsync_state)),
1146 pfsync_bulk_fail, sc);
1147 if (V_pf_status.debug >= PF_DEBUG_MISC)
1148 printf("pfsync: received bulk update start\n");
1149 break;
1150
1151 case PFSYNC_BUS_END:
1152 if (time_uptime - ntohl(bus->endtime) >=
1153 sc->sc_ureq_sent) {
1154 /* that's it, we're happy */
1155 sc->sc_ureq_sent = 0;
1156 sc->sc_bulk_tries = 0;
1157 callout_stop(&sc->sc_bulkfail_tmo);
1158 if (!(sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p)
1159 (*carp_demote_adj_p)(-V_pfsync_carp_adj,
1160 "pfsync bulk done");
1161 sc->sc_flags |= PFSYNCF_OK;
1162 if (V_pf_status.debug >= PF_DEBUG_MISC)
1163 printf("pfsync: received valid "
1164 "bulk update end\n");
1165 } else {
1166 if (V_pf_status.debug >= PF_DEBUG_MISC)
1167 printf("pfsync: received invalid "
1168 "bulk update end: bad timestamp\n");
1169 }
1170 break;
1171 }
1172 PFSYNC_BUNLOCK(sc);
1173
1174 return (len);
1175}
1176
1177static int
1178pfsync_in_tdb(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
1179{
1180 int len = count * sizeof(struct pfsync_tdb);
1181
1182#if defined(IPSEC)
1183 struct pfsync_tdb *tp;
1184 struct mbuf *mp;
1185 int offp;
1186 int i;
1187 int s;
1188
1189 mp = m_pulldown(m, offset, len, &offp);
1190 if (mp == NULL) {
1191 V_pfsyncstats.pfsyncs_badlen++;
1192 return (-1);
1193 }
1194 tp = (struct pfsync_tdb *)(mp->m_data + offp);
1195
1196 for (i = 0; i < count; i++)
1197 pfsync_update_net_tdb(&tp[i]);
1198#endif
1199
1200 return (len);
1201}
1202
1203#if defined(IPSEC)
1204/* Update an in-kernel tdb. Silently fail if no tdb is found. */
1205static void
1206pfsync_update_net_tdb(struct pfsync_tdb *pt)
1207{
1208 struct tdb *tdb;
1209 int s;
1210
1211 /* check for invalid values */
1212 if (ntohl(pt->spi) <= SPI_RESERVED_MAX ||
1213 (pt->dst.sa.sa_family != AF_INET &&
1214 pt->dst.sa.sa_family != AF_INET6))
1215 goto bad;
1216
1217 tdb = gettdb(pt->spi, &pt->dst, pt->sproto);
1218 if (tdb) {
1219 pt->rpl = ntohl(pt->rpl);
1220 pt->cur_bytes = (unsigned long long)be64toh(pt->cur_bytes);
1221
1222 /* Neither replay nor byte counter should ever decrease. */
1223 if (pt->rpl < tdb->tdb_rpl ||
1224 pt->cur_bytes < tdb->tdb_cur_bytes) {
1225 goto bad;
1226 }
1227
1228 tdb->tdb_rpl = pt->rpl;
1229 tdb->tdb_cur_bytes = pt->cur_bytes;
1230 }
1231 return;
1232
1233bad:
1234 if (V_pf_status.debug >= PF_DEBUG_MISC)
1235 printf("pfsync_insert: PFSYNC_ACT_TDB_UPD: "
1236 "invalid value\n");
1237 V_pfsyncstats.pfsyncs_badstate++;
1238 return;
1239}
1240#endif
1241
1242
1243static int
1244pfsync_in_eof(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
1245{
1246 /* check if we are at the right place in the packet */
1247 if (offset != m->m_pkthdr.len)
1248 V_pfsyncstats.pfsyncs_badlen++;
1249
1250 /* we're done. free and let the caller return */
1251 m_freem(m);
1252 return (-1);
1253}
1254
1255static int
1256pfsync_in_error(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
1257{
1258 V_pfsyncstats.pfsyncs_badact++;
1259
1260 m_freem(m);
1261 return (-1);
1262}
1263
1264static int
1265pfsyncoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
1266 struct route *rt)
1267{
1268 m_freem(m);
1269 return (0);
1270}
1271
1272/* ARGSUSED */
1273static int
1274pfsyncioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
1275{
1276 struct pfsync_softc *sc = ifp->if_softc;
1277 struct ifreq *ifr = (struct ifreq *)data;
1278 struct pfsyncreq pfsyncr;
1279 int error;
1280
1281 switch (cmd) {
1282 case SIOCSIFFLAGS:
1283 PFSYNC_LOCK(sc);
1284 if (ifp->if_flags & IFF_UP) {
1285 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1286 PFSYNC_UNLOCK(sc);
1287 pfsync_pointers_init();
1288 } else {
1289 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1290 PFSYNC_UNLOCK(sc);
1291 pfsync_pointers_uninit();
1292 }
1293 break;
1294 case SIOCSIFMTU:
1295 if (!sc->sc_sync_if ||
1296 ifr->ifr_mtu <= PFSYNC_MINPKT ||
1297 ifr->ifr_mtu > sc->sc_sync_if->if_mtu)
1298 return (EINVAL);
1299 if (ifr->ifr_mtu < ifp->if_mtu) {
1300 PFSYNC_LOCK(sc);
1301 if (sc->sc_len > PFSYNC_MINPKT)
1302 pfsync_sendout(1);
1303 PFSYNC_UNLOCK(sc);
1304 }
1305 ifp->if_mtu = ifr->ifr_mtu;
1306 break;
1307 case SIOCGETPFSYNC:
1308 bzero(&pfsyncr, sizeof(pfsyncr));
1309 PFSYNC_LOCK(sc);
1310 if (sc->sc_sync_if) {
1311 strlcpy(pfsyncr.pfsyncr_syncdev,
1312 sc->sc_sync_if->if_xname, IFNAMSIZ);
1313 }
1314 pfsyncr.pfsyncr_syncpeer = sc->sc_sync_peer;
1315 pfsyncr.pfsyncr_maxupdates = sc->sc_maxupdates;
1316 pfsyncr.pfsyncr_defer = (PFSYNCF_DEFER ==
1317 (sc->sc_flags & PFSYNCF_DEFER));
1318 PFSYNC_UNLOCK(sc);
1319 return (copyout(&pfsyncr, ifr->ifr_data, sizeof(pfsyncr)));
1320
1321 case SIOCSETPFSYNC:
1322 {
1323 struct ip_moptions *imo = &sc->sc_imo;
1324 struct ifnet *sifp;
1325 struct ip *ip;
1326 void *mship = NULL;
1327
1328 if ((error = priv_check(curthread, PRIV_NETINET_PF)) != 0)
1329 return (error);
1330 if ((error = copyin(ifr->ifr_data, &pfsyncr, sizeof(pfsyncr))))
1331 return (error);
1332
1333 if (pfsyncr.pfsyncr_maxupdates > 255)
1334 return (EINVAL);
1335
1336 if (pfsyncr.pfsyncr_syncdev[0] == 0)
1337 sifp = NULL;
1338 else if ((sifp = ifunit_ref(pfsyncr.pfsyncr_syncdev)) == NULL)
1339 return (EINVAL);
1340
1341 if (sifp != NULL && (
1342 pfsyncr.pfsyncr_syncpeer.s_addr == 0 ||
1343 pfsyncr.pfsyncr_syncpeer.s_addr ==
1344 htonl(INADDR_PFSYNC_GROUP)))
1345 mship = malloc((sizeof(struct in_multi *) *
1346 IP_MIN_MEMBERSHIPS), M_PFSYNC, M_WAITOK | M_ZERO);
1347
1348 PFSYNC_LOCK(sc);
1349 if (pfsyncr.pfsyncr_syncpeer.s_addr == 0)
1350 sc->sc_sync_peer.s_addr = htonl(INADDR_PFSYNC_GROUP);
1351 else
1352 sc->sc_sync_peer.s_addr =
1353 pfsyncr.pfsyncr_syncpeer.s_addr;
1354
1355 sc->sc_maxupdates = pfsyncr.pfsyncr_maxupdates;
1356 if (pfsyncr.pfsyncr_defer) {
1357 sc->sc_flags |= PFSYNCF_DEFER;
1358 pfsync_defer_ptr = pfsync_defer;
1359 } else {
1360 sc->sc_flags &= ~PFSYNCF_DEFER;
1361 pfsync_defer_ptr = NULL;
1362 }
1363
1364 if (sifp == NULL) {
1365 if (sc->sc_sync_if)
1366 if_rele(sc->sc_sync_if);
1367 sc->sc_sync_if = NULL;
1368 if (imo->imo_membership)
1369 pfsync_multicast_cleanup(sc);
1370 PFSYNC_UNLOCK(sc);
1371 break;
1372 }
1373
1374 if (sc->sc_len > PFSYNC_MINPKT &&
1375 (sifp->if_mtu < sc->sc_ifp->if_mtu ||
1376 (sc->sc_sync_if != NULL &&
1377 sifp->if_mtu < sc->sc_sync_if->if_mtu) ||
1378 sifp->if_mtu < MCLBYTES - sizeof(struct ip)))
1379 pfsync_sendout(1);
1380
1381 if (imo->imo_membership)
1382 pfsync_multicast_cleanup(sc);
1383
1384 if (sc->sc_sync_peer.s_addr == htonl(INADDR_PFSYNC_GROUP)) {
1385 error = pfsync_multicast_setup(sc, sifp, mship);
1386 if (error) {
1387 if_rele(sifp);
1388 free(mship, M_PFSYNC);
1389 return (error);
1390 }
1391 }
1392 if (sc->sc_sync_if)
1393 if_rele(sc->sc_sync_if);
1394 sc->sc_sync_if = sifp;
1395
1396 ip = &sc->sc_template;
1397 bzero(ip, sizeof(*ip));
1398 ip->ip_v = IPVERSION;
1399 ip->ip_hl = sizeof(sc->sc_template) >> 2;
1400 ip->ip_tos = IPTOS_LOWDELAY;
1401 /* len and id are set later. */
1402 ip->ip_off = htons(IP_DF);
1403 ip->ip_ttl = PFSYNC_DFLTTL;
1404 ip->ip_p = IPPROTO_PFSYNC;
1405 ip->ip_src.s_addr = INADDR_ANY;
1406 ip->ip_dst.s_addr = sc->sc_sync_peer.s_addr;
1407
1408 /* Request a full state table update. */
1409 if ((sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p)
1410 (*carp_demote_adj_p)(V_pfsync_carp_adj,
1411 "pfsync bulk start");
1412 sc->sc_flags &= ~PFSYNCF_OK;
1413 if (V_pf_status.debug >= PF_DEBUG_MISC)
1414 printf("pfsync: requesting bulk update\n");
1415 pfsync_request_update(0, 0);
1416 PFSYNC_UNLOCK(sc);
1417 PFSYNC_BLOCK(sc);
1418 sc->sc_ureq_sent = time_uptime;
1419 callout_reset(&sc->sc_bulkfail_tmo, 5 * hz, pfsync_bulk_fail,
1420 sc);
1421 PFSYNC_BUNLOCK(sc);
1422
1423 break;
1424 }
1425 default:
1426 return (ENOTTY);
1427 }
1428
1429 return (0);
1430}
1431
1432static void
1433pfsync_out_state(struct pf_state *st, void *buf)
1434{
1435 struct pfsync_state *sp = buf;
1436
1437 pfsync_state_export(sp, st);
1438}
1439
1440static void
1441pfsync_out_iack(struct pf_state *st, void *buf)
1442{
1443 struct pfsync_ins_ack *iack = buf;
1444
1445 iack->id = st->id;
1446 iack->creatorid = st->creatorid;
1447}
1448
1449static void
1450pfsync_out_upd_c(struct pf_state *st, void *buf)
1451{
1452 struct pfsync_upd_c *up = buf;
1453
1454 bzero(up, sizeof(*up));
1455 up->id = st->id;
1456 pf_state_peer_hton(&st->src, &up->src);
1457 pf_state_peer_hton(&st->dst, &up->dst);
1458 up->creatorid = st->creatorid;
1459 up->timeout = st->timeout;
1460}
1461
1462static void
1463pfsync_out_del(struct pf_state *st, void *buf)
1464{
1465 struct pfsync_del_c *dp = buf;
1466
1467 dp->id = st->id;
1468 dp->creatorid = st->creatorid;
1469 st->state_flags |= PFSTATE_NOSYNC;
1470}
1471
1472static void
1473pfsync_drop(struct pfsync_softc *sc)
1474{
1475 struct pf_state *st, *next;
1476 struct pfsync_upd_req_item *ur;
1477 int q;
1478
1479 for (q = 0; q < PFSYNC_S_COUNT; q++) {
1480 if (TAILQ_EMPTY(&sc->sc_qs[q]))
1481 continue;
1482
1483 TAILQ_FOREACH_SAFE(st, &sc->sc_qs[q], sync_list, next) {
1484 KASSERT(st->sync_state == q,
1485 ("%s: st->sync_state == q",
1486 __func__));
1487 st->sync_state = PFSYNC_S_NONE;
1488 pf_release_state(st);
1489 }
1490 TAILQ_INIT(&sc->sc_qs[q]);
1491 }
1492
1493 while ((ur = TAILQ_FIRST(&sc->sc_upd_req_list)) != NULL) {
1494 TAILQ_REMOVE(&sc->sc_upd_req_list, ur, ur_entry);
1495 free(ur, M_PFSYNC);
1496 }
1497
1498 sc->sc_plus = NULL;
1499 sc->sc_len = PFSYNC_MINPKT;
1500}
1501
1502static void
1503pfsync_sendout(int schedswi)
1504{
1505 struct pfsync_softc *sc = V_pfsyncif;
1506 struct ifnet *ifp = sc->sc_ifp;
1507 struct mbuf *m;
1508 struct ip *ip;
1509 struct pfsync_header *ph;
1510 struct pfsync_subheader *subh;
1511 struct pf_state *st;
1512 struct pfsync_upd_req_item *ur;
1513 int offset;
1514 int q, count = 0;
1515
1516 KASSERT(sc != NULL, ("%s: null sc", __func__));
1517 KASSERT(sc->sc_len > PFSYNC_MINPKT,
1518 ("%s: sc_len %zu", __func__, sc->sc_len));
1519 PFSYNC_LOCK_ASSERT(sc);
1520
1521 if (ifp->if_bpf == NULL && sc->sc_sync_if == NULL) {
1522 pfsync_drop(sc);
1523 return;
1524 }
1525
1526 m = m_get2(max_linkhdr + sc->sc_len, M_NOWAIT, MT_DATA, M_PKTHDR);
1527 if (m == NULL) {
1528 sc->sc_ifp->if_oerrors++;
1529 V_pfsyncstats.pfsyncs_onomem++;
1530 return;
1531 }
1532 m->m_data += max_linkhdr;
1533 m->m_len = m->m_pkthdr.len = sc->sc_len;
1534
1535 /* build the ip header */
1536 ip = (struct ip *)m->m_data;
1537 bcopy(&sc->sc_template, ip, sizeof(*ip));
1538 offset = sizeof(*ip);
1539
1540 ip->ip_len = htons(m->m_pkthdr.len);
1541 ip->ip_id = htons(ip_randomid());
1542
1543 /* build the pfsync header */
1544 ph = (struct pfsync_header *)(m->m_data + offset);
1545 bzero(ph, sizeof(*ph));
1546 offset += sizeof(*ph);
1547
1548 ph->version = PFSYNC_VERSION;
1549 ph->len = htons(sc->sc_len - sizeof(*ip));
1550 bcopy(V_pf_status.pf_chksum, ph->pfcksum, PF_MD5_DIGEST_LENGTH);
1551
1552 /* walk the queues */
1553 for (q = 0; q < PFSYNC_S_COUNT; q++) {
1554 if (TAILQ_EMPTY(&sc->sc_qs[q]))
1555 continue;
1556
1557 subh = (struct pfsync_subheader *)(m->m_data + offset);
1558 offset += sizeof(*subh);
1559
1560 count = 0;
1561 TAILQ_FOREACH(st, &sc->sc_qs[q], sync_list) {
1562 KASSERT(st->sync_state == q,
1563 ("%s: st->sync_state == q",
1564 __func__));
1565 /*
1566 * XXXGL: some of write methods do unlocked reads
1567 * of state data :(
1568 */
1569 pfsync_qs[q].write(st, m->m_data + offset);
1570 offset += pfsync_qs[q].len;
1571 st->sync_state = PFSYNC_S_NONE;
1572 pf_release_state(st);
1573 count++;
1574 }
1575 TAILQ_INIT(&sc->sc_qs[q]);
1576
1577 bzero(subh, sizeof(*subh));
1578 subh->action = pfsync_qs[q].action;
1579 subh->count = htons(count);
1580 V_pfsyncstats.pfsyncs_oacts[pfsync_qs[q].action] += count;
1581 }
1582
1583 if (!TAILQ_EMPTY(&sc->sc_upd_req_list)) {
1584 subh = (struct pfsync_subheader *)(m->m_data + offset);
1585 offset += sizeof(*subh);
1586
1587 count = 0;
1588 while ((ur = TAILQ_FIRST(&sc->sc_upd_req_list)) != NULL) {
1589 TAILQ_REMOVE(&sc->sc_upd_req_list, ur, ur_entry);
1590
1591 bcopy(&ur->ur_msg, m->m_data + offset,
1592 sizeof(ur->ur_msg));
1593 offset += sizeof(ur->ur_msg);
1594 free(ur, M_PFSYNC);
1595 count++;
1596 }
1597
1598 bzero(subh, sizeof(*subh));
1599 subh->action = PFSYNC_ACT_UPD_REQ;
1600 subh->count = htons(count);
1601 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_UPD_REQ] += count;
1602 }
1603
1604 /* has someone built a custom region for us to add? */
1605 if (sc->sc_plus != NULL) {
1606 bcopy(sc->sc_plus, m->m_data + offset, sc->sc_pluslen);
1607 offset += sc->sc_pluslen;
1608
1609 sc->sc_plus = NULL;
1610 }
1611
1612 subh = (struct pfsync_subheader *)(m->m_data + offset);
1613 offset += sizeof(*subh);
1614
1615 bzero(subh, sizeof(*subh));
1616 subh->action = PFSYNC_ACT_EOF;
1617 subh->count = htons(1);
1618 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_EOF]++;
1619
1620 /* we're done, let's put it on the wire */
1621 if (ifp->if_bpf) {
1622 m->m_data += sizeof(*ip);
1623 m->m_len = m->m_pkthdr.len = sc->sc_len - sizeof(*ip);
1624 BPF_MTAP(ifp, m);
1625 m->m_data -= sizeof(*ip);
1626 m->m_len = m->m_pkthdr.len = sc->sc_len;
1627 }
1628
1629 if (sc->sc_sync_if == NULL) {
1630 sc->sc_len = PFSYNC_MINPKT;
1631 m_freem(m);
1632 return;
1633 }
1634
1635 sc->sc_ifp->if_opackets++;
1636 sc->sc_ifp->if_obytes += m->m_pkthdr.len;
1637 sc->sc_len = PFSYNC_MINPKT;
1638
1639 if (!_IF_QFULL(&sc->sc_ifp->if_snd))
1640 _IF_ENQUEUE(&sc->sc_ifp->if_snd, m);
1641 else {
1642 m_freem(m);
1643 sc->sc_ifp->if_snd.ifq_drops++;
1644 }
1645 if (schedswi)
1646 swi_sched(V_pfsync_swi_cookie, 0);
1647}
1648
1649static void
1650pfsync_insert_state(struct pf_state *st)
1651{
1652 struct pfsync_softc *sc = V_pfsyncif;
1653
1654 if (st->state_flags & PFSTATE_NOSYNC)
1655 return;
1656
1657 if ((st->rule.ptr->rule_flag & PFRULE_NOSYNC) ||
1658 st->key[PF_SK_WIRE]->proto == IPPROTO_PFSYNC) {
1659 st->state_flags |= PFSTATE_NOSYNC;
1660 return;
1661 }
1662
1663 KASSERT(st->sync_state == PFSYNC_S_NONE,
1664 ("%s: st->sync_state %u", __func__, st->sync_state));
1665
1666 PFSYNC_LOCK(sc);
1667 if (sc->sc_len == PFSYNC_MINPKT)
1668 callout_reset(&sc->sc_tmo, 1 * hz, pfsync_timeout, V_pfsyncif);
1669
1670 pfsync_q_ins(st, PFSYNC_S_INS);
1671 PFSYNC_UNLOCK(sc);
1672
1673 st->sync_updates = 0;
1674}
1675
1676static int
1677pfsync_defer(struct pf_state *st, struct mbuf *m)
1678{
1679 struct pfsync_softc *sc = V_pfsyncif;
1680 struct pfsync_deferral *pd;
1681
1682 if (m->m_flags & (M_BCAST|M_MCAST))
1683 return (0);
1684
1685 PFSYNC_LOCK(sc);
1686
1687 if (sc == NULL || !(sc->sc_ifp->if_flags & IFF_DRV_RUNNING) ||
1688 !(sc->sc_flags & PFSYNCF_DEFER)) {
1689 PFSYNC_UNLOCK(sc);
1690 return (0);
1691 }
1692
1693 if (sc->sc_deferred >= 128)
1694 pfsync_undefer(TAILQ_FIRST(&sc->sc_deferrals), 0);
1695
1696 pd = malloc(sizeof(*pd), M_PFSYNC, M_NOWAIT);
1697 if (pd == NULL)
1698 return (0);
1699 sc->sc_deferred++;
1700
1701 m->m_flags |= M_SKIP_FIREWALL;
1702 st->state_flags |= PFSTATE_ACK;
1703
1704 pd->pd_sc = sc;
1705 pd->pd_refs = 0;
1706 pd->pd_st = st;
1707 pf_ref_state(st);
1708 pd->pd_m = m;
1709
1710 TAILQ_INSERT_TAIL(&sc->sc_deferrals, pd, pd_entry);
1711 callout_init_mtx(&pd->pd_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED);
1712 callout_reset(&pd->pd_tmo, 10, pfsync_defer_tmo, pd);
1713
1714 pfsync_push(sc);
1715
1716 return (1);
1717}
1718
1719static void
1720pfsync_undefer(struct pfsync_deferral *pd, int drop)
1721{
1722 struct pfsync_softc *sc = pd->pd_sc;
1723 struct mbuf *m = pd->pd_m;
1724 struct pf_state *st = pd->pd_st;
1725
1726 PFSYNC_LOCK_ASSERT(sc);
1727
1728 TAILQ_REMOVE(&sc->sc_deferrals, pd, pd_entry);
1729 sc->sc_deferred--;
1730 pd->pd_st->state_flags &= ~PFSTATE_ACK; /* XXX: locking! */
1731 free(pd, M_PFSYNC);
1732 pf_release_state(st);
1733
1734 if (drop)
1735 m_freem(m);
1736 else {
1737 _IF_ENQUEUE(&sc->sc_ifp->if_snd, m);
1738 pfsync_push(sc);
1739 }
1740}
1741
1742static void
1743pfsync_defer_tmo(void *arg)
1744{
1745 struct pfsync_deferral *pd = arg;
1746 struct pfsync_softc *sc = pd->pd_sc;
1747 struct mbuf *m = pd->pd_m;
1748 struct pf_state *st = pd->pd_st;
1749
1750 PFSYNC_LOCK_ASSERT(sc);
1751
1752 CURVNET_SET(m->m_pkthdr.rcvif->if_vnet);
1753
1754 TAILQ_REMOVE(&sc->sc_deferrals, pd, pd_entry);
1755 sc->sc_deferred--;
1756 pd->pd_st->state_flags &= ~PFSTATE_ACK; /* XXX: locking! */
1757 if (pd->pd_refs == 0)
1758 free(pd, M_PFSYNC);
1759 PFSYNC_UNLOCK(sc);
1760
1761 ip_output(m, NULL, NULL, 0, NULL, NULL);
1762
1763 pf_release_state(st);
1764
1765 CURVNET_RESTORE();
1766}
1767
1768static void
1769pfsync_undefer_state(struct pf_state *st, int drop)
1770{
1771 struct pfsync_softc *sc = V_pfsyncif;
1772 struct pfsync_deferral *pd;
1773
1774 PFSYNC_LOCK_ASSERT(sc);
1775
1776 TAILQ_FOREACH(pd, &sc->sc_deferrals, pd_entry) {
1777 if (pd->pd_st == st) {
1778 if (callout_stop(&pd->pd_tmo))
1779 pfsync_undefer(pd, drop);
1780 return;
1781 }
1782 }
1783
1784 panic("%s: unable to find deferred state", __func__);
1785}
1786
1787static void
1788pfsync_update_state(struct pf_state *st)
1789{
1790 struct pfsync_softc *sc = V_pfsyncif;
1791 int sync = 0;
1792
1793 PF_STATE_LOCK_ASSERT(st);
1794 PFSYNC_LOCK(sc);
1795
1796 if (st->state_flags & PFSTATE_ACK)
1797 pfsync_undefer_state(st, 0);
1798 if (st->state_flags & PFSTATE_NOSYNC) {
1799 if (st->sync_state != PFSYNC_S_NONE)
1800 pfsync_q_del(st);
1801 PFSYNC_UNLOCK(sc);
1802 return;
1803 }
1804
1805 if (sc->sc_len == PFSYNC_MINPKT)
1806 callout_reset(&sc->sc_tmo, 1 * hz, pfsync_timeout, V_pfsyncif);
1807
1808 switch (st->sync_state) {
1809 case PFSYNC_S_UPD_C:
1810 case PFSYNC_S_UPD:
1811 case PFSYNC_S_INS:
1812 /* we're already handling it */
1813
1814 if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP) {
1815 st->sync_updates++;
1816 if (st->sync_updates >= sc->sc_maxupdates)
1817 sync = 1;
1818 }
1819 break;
1820
1821 case PFSYNC_S_IACK:
1822 pfsync_q_del(st);
1823 case PFSYNC_S_NONE:
1824 pfsync_q_ins(st, PFSYNC_S_UPD_C);
1825 st->sync_updates = 0;
1826 break;
1827
1828 default:
1829 panic("%s: unexpected sync state %d", __func__, st->sync_state);
1830 }
1831
1832 if (sync || (time_uptime - st->pfsync_time) < 2)
1833 pfsync_push(sc);
1834
1835 PFSYNC_UNLOCK(sc);
1836}
1837
1838static void
1839pfsync_request_update(u_int32_t creatorid, u_int64_t id)
1840{
1841 struct pfsync_softc *sc = V_pfsyncif;
1842 struct pfsync_upd_req_item *item;
1843 size_t nlen = sizeof(struct pfsync_upd_req);
1844
1845 PFSYNC_LOCK_ASSERT(sc);
1846
1847 /*
1848 * This code does a bit to prevent multiple update requests for the
1849 * same state being generated. It searches current subheader queue,
1850 * but it doesn't lookup into queue of already packed datagrams.
1851 */
1852 TAILQ_FOREACH(item, &sc->sc_upd_req_list, ur_entry)
1853 if (item->ur_msg.id == id &&
1854 item->ur_msg.creatorid == creatorid)
1855 return;
1856
1857 item = malloc(sizeof(*item), M_PFSYNC, M_NOWAIT);
1858 if (item == NULL)
1859 return; /* XXX stats */
1860
1861 item->ur_msg.id = id;
1862 item->ur_msg.creatorid = creatorid;
1863
1864 if (TAILQ_EMPTY(&sc->sc_upd_req_list))
1865 nlen += sizeof(struct pfsync_subheader);
1866
1867 if (sc->sc_len + nlen > sc->sc_ifp->if_mtu) {
1868 pfsync_sendout(1);
1869
1870 nlen = sizeof(struct pfsync_subheader) +
1871 sizeof(struct pfsync_upd_req);
1872 }
1873
1874 TAILQ_INSERT_TAIL(&sc->sc_upd_req_list, item, ur_entry);
1875 sc->sc_len += nlen;
1876}
1877
1878static void
1879pfsync_update_state_req(struct pf_state *st)
1880{
1881 struct pfsync_softc *sc = V_pfsyncif;
1882
1883 PF_STATE_LOCK_ASSERT(st);
1884 PFSYNC_LOCK(sc);
1885
1886 if (st->state_flags & PFSTATE_NOSYNC) {
1887 if (st->sync_state != PFSYNC_S_NONE)
1888 pfsync_q_del(st);
1889 PFSYNC_UNLOCK(sc);
1890 return;
1891 }
1892
1893 switch (st->sync_state) {
1894 case PFSYNC_S_UPD_C:
1895 case PFSYNC_S_IACK:
1896 pfsync_q_del(st);
1897 case PFSYNC_S_NONE:
1898 pfsync_q_ins(st, PFSYNC_S_UPD);
1899 pfsync_push(sc);
1900 break;
1901
1902 case PFSYNC_S_INS:
1903 case PFSYNC_S_UPD:
1904 case PFSYNC_S_DEL:
1905 /* we're already handling it */
1906 break;
1907
1908 default:
1909 panic("%s: unexpected sync state %d", __func__, st->sync_state);
1910 }
1911
1912 PFSYNC_UNLOCK(sc);
1913}
1914
1915static void
1916pfsync_delete_state(struct pf_state *st)
1917{
1918 struct pfsync_softc *sc = V_pfsyncif;
1919
1920 PFSYNC_LOCK(sc);
1921 if (st->state_flags & PFSTATE_ACK)
1922 pfsync_undefer_state(st, 1);
1923 if (st->state_flags & PFSTATE_NOSYNC) {
1924 if (st->sync_state != PFSYNC_S_NONE)
1925 pfsync_q_del(st);
1926 PFSYNC_UNLOCK(sc);
1927 return;
1928 }
1929
1930 if (sc->sc_len == PFSYNC_MINPKT)
1931 callout_reset(&sc->sc_tmo, 1 * hz, pfsync_timeout, V_pfsyncif);
1932
1933 switch (st->sync_state) {
1934 case PFSYNC_S_INS:
1935 /* We never got to tell the world so just forget about it. */
1936 pfsync_q_del(st);
1937 break;
1938
1939 case PFSYNC_S_UPD_C:
1940 case PFSYNC_S_UPD:
1941 case PFSYNC_S_IACK:
1942 pfsync_q_del(st);
1943 /* FALLTHROUGH to putting it on the del list */
1944
1945 case PFSYNC_S_NONE:
1946 pfsync_q_ins(st, PFSYNC_S_DEL);
1947 break;
1948
1949 default:
1950 panic("%s: unexpected sync state %d", __func__, st->sync_state);
1951 }
1952 PFSYNC_UNLOCK(sc);
1953}
1954
1955static void
1956pfsync_clear_states(u_int32_t creatorid, const char *ifname)
1957{
1958 struct pfsync_softc *sc = V_pfsyncif;
1959 struct {
1960 struct pfsync_subheader subh;
1961 struct pfsync_clr clr;
1962 } __packed r;
1963
1964 bzero(&r, sizeof(r));
1965
1966 r.subh.action = PFSYNC_ACT_CLR;
1967 r.subh.count = htons(1);
1968 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_CLR]++;
1969
1970 strlcpy(r.clr.ifname, ifname, sizeof(r.clr.ifname));
1971 r.clr.creatorid = creatorid;
1972
1973 PFSYNC_LOCK(sc);
1974 pfsync_send_plus(&r, sizeof(r));
1975 PFSYNC_UNLOCK(sc);
1976}
1977
1978static void
1979pfsync_q_ins(struct pf_state *st, int q)
1980{
1981 struct pfsync_softc *sc = V_pfsyncif;
1982 size_t nlen = pfsync_qs[q].len;
1983
1984 PFSYNC_LOCK_ASSERT(sc);
1985
1986 KASSERT(st->sync_state == PFSYNC_S_NONE,
1987 ("%s: st->sync_state %u", __func__, st->sync_state));
1988 KASSERT(sc->sc_len >= PFSYNC_MINPKT, ("pfsync pkt len is too low %zu",
1989 sc->sc_len));
1990
1991 if (TAILQ_EMPTY(&sc->sc_qs[q]))
1992 nlen += sizeof(struct pfsync_subheader);
1993
1994 if (sc->sc_len + nlen > sc->sc_ifp->if_mtu) {
1995 pfsync_sendout(1);
1996
1997 nlen = sizeof(struct pfsync_subheader) + pfsync_qs[q].len;
1998 }
1999
2000 sc->sc_len += nlen;
2001 TAILQ_INSERT_TAIL(&sc->sc_qs[q], st, sync_list);
2002 st->sync_state = q;
2003 pf_ref_state(st);
2004}
2005
2006static void
2007pfsync_q_del(struct pf_state *st)
2008{
2009 struct pfsync_softc *sc = V_pfsyncif;
2010 int q = st->sync_state;
2011
2012 PFSYNC_LOCK_ASSERT(sc);
2013 KASSERT(st->sync_state != PFSYNC_S_NONE,
2014 ("%s: st->sync_state != PFSYNC_S_NONE", __func__));
2015
2016 sc->sc_len -= pfsync_qs[q].len;
2017 TAILQ_REMOVE(&sc->sc_qs[q], st, sync_list);
2018 st->sync_state = PFSYNC_S_NONE;
2019 pf_release_state(st);
2020
2021 if (TAILQ_EMPTY(&sc->sc_qs[q]))
2022 sc->sc_len -= sizeof(struct pfsync_subheader);
2023}
2024
2025static void
2026pfsync_bulk_start(void)
2027{
2028 struct pfsync_softc *sc = V_pfsyncif;
2029
2030 if (V_pf_status.debug >= PF_DEBUG_MISC)
2031 printf("pfsync: received bulk update request\n");
2032
2033 PFSYNC_BLOCK(sc);
2034
2035 sc->sc_ureq_received = time_uptime;
2036 sc->sc_bulk_hashid = 0;
2037 sc->sc_bulk_stateid = 0;
2038 pfsync_bulk_status(PFSYNC_BUS_START);
2039 callout_reset(&sc->sc_bulk_tmo, 1, pfsync_bulk_update, sc);
2040 PFSYNC_BUNLOCK(sc);
2041}
2042
2043static void
2044pfsync_bulk_update(void *arg)
2045{
2046 struct pfsync_softc *sc = arg;
2047 struct pf_state *s;
2048 int i, sent = 0;
2049
2050 PFSYNC_BLOCK_ASSERT(sc);
2051 CURVNET_SET(sc->sc_ifp->if_vnet);
2052
2053 /*
2054 * Start with last state from previous invocation.
2055 * It may had gone, in this case start from the
2056 * hash slot.
2057 */
2058 s = pf_find_state_byid(sc->sc_bulk_stateid, sc->sc_bulk_creatorid);
2059
2060 if (s != NULL)
2061 i = PF_IDHASH(s);
2062 else
2063 i = sc->sc_bulk_hashid;
2064
2065 for (; i <= pf_hashmask; i++) {
2066 struct pf_idhash *ih = &V_pf_idhash[i];
2067
2068 if (s != NULL)
2069 PF_HASHROW_ASSERT(ih);
2070 else {
2071 PF_HASHROW_LOCK(ih);
2072 s = LIST_FIRST(&ih->states);
2073 }
2074
2075 for (; s; s = LIST_NEXT(s, entry)) {
2076
2077 if (sent > 1 && (sc->sc_ifp->if_mtu - sc->sc_len) <
2078 sizeof(struct pfsync_state)) {
2079 /* We've filled a packet. */
2080 sc->sc_bulk_hashid = i;
2081 sc->sc_bulk_stateid = s->id;
2082 sc->sc_bulk_creatorid = s->creatorid;
2083 PF_HASHROW_UNLOCK(ih);
2084 callout_reset(&sc->sc_bulk_tmo, 1,
2085 pfsync_bulk_update, sc);
2086 goto full;
2087 }
2088
2089 if (s->sync_state == PFSYNC_S_NONE &&
2090 s->timeout < PFTM_MAX &&
2091 s->pfsync_time <= sc->sc_ureq_received) {
2092 pfsync_update_state_req(s);
2093 sent++;
2094 }
2095 }
2096 PF_HASHROW_UNLOCK(ih);
2097 }
2098
2099 /* We're done. */
2100 pfsync_bulk_status(PFSYNC_BUS_END);
2101
2102full:
2103 CURVNET_RESTORE();
2104}
2105
2106static void
2107pfsync_bulk_status(u_int8_t status)
2108{
2109 struct {
2110 struct pfsync_subheader subh;
2111 struct pfsync_bus bus;
2112 } __packed r;
2113
2114 struct pfsync_softc *sc = V_pfsyncif;
2115
2116 bzero(&r, sizeof(r));
2117
2118 r.subh.action = PFSYNC_ACT_BUS;
2119 r.subh.count = htons(1);
2120 V_pfsyncstats.pfsyncs_oacts[PFSYNC_ACT_BUS]++;
2121
2122 r.bus.creatorid = V_pf_status.hostid;
2123 r.bus.endtime = htonl(time_uptime - sc->sc_ureq_received);
2124 r.bus.status = status;
2125
2126 PFSYNC_LOCK(sc);
2127 pfsync_send_plus(&r, sizeof(r));
2128 PFSYNC_UNLOCK(sc);
2129}
2130
2131static void
2132pfsync_bulk_fail(void *arg)
2133{
2134 struct pfsync_softc *sc = arg;
2135
2136 CURVNET_SET(sc->sc_ifp->if_vnet);
2137
2138 PFSYNC_BLOCK_ASSERT(sc);
2139
2140 if (sc->sc_bulk_tries++ < PFSYNC_MAX_BULKTRIES) {
2141 /* Try again */
2142 callout_reset(&sc->sc_bulkfail_tmo, 5 * hz,
2143 pfsync_bulk_fail, V_pfsyncif);
2144 PFSYNC_LOCK(sc);
2145 pfsync_request_update(0, 0);
2146 PFSYNC_UNLOCK(sc);
2147 } else {
2148 /* Pretend like the transfer was ok. */
2149 sc->sc_ureq_sent = 0;
2150 sc->sc_bulk_tries = 0;
2151 PFSYNC_LOCK(sc);
2152 if (!(sc->sc_flags & PFSYNCF_OK) && carp_demote_adj_p)
2153 (*carp_demote_adj_p)(-V_pfsync_carp_adj,
2154 "pfsync bulk fail");
2155 sc->sc_flags |= PFSYNCF_OK;
2156 PFSYNC_UNLOCK(sc);
2157 if (V_pf_status.debug >= PF_DEBUG_MISC)
2158 printf("pfsync: failed to receive bulk update\n");
2159 }
2160
2161 CURVNET_RESTORE();
2162}
2163
2164static void
2165pfsync_send_plus(void *plus, size_t pluslen)
2166{
2167 struct pfsync_softc *sc = V_pfsyncif;
2168
2169 PFSYNC_LOCK_ASSERT(sc);
2170
2171 if (sc->sc_len + pluslen > sc->sc_ifp->if_mtu)
2172 pfsync_sendout(1);
2173
2174 sc->sc_plus = plus;
2175 sc->sc_len += (sc->sc_pluslen = pluslen);
2176
2177 pfsync_sendout(1);
2178}
2179
2180static void
2181pfsync_timeout(void *arg)
2182{
2183 struct pfsync_softc *sc = arg;
2184
2185 CURVNET_SET(sc->sc_ifp->if_vnet);
2186 PFSYNC_LOCK(sc);
2187 pfsync_push(sc);
2188 PFSYNC_UNLOCK(sc);
2189 CURVNET_RESTORE();
2190}
2191
2192static void
2193pfsync_push(struct pfsync_softc *sc)
2194{
2195
2196 PFSYNC_LOCK_ASSERT(sc);
2197
2198 sc->sc_flags |= PFSYNCF_PUSH;
2199 swi_sched(V_pfsync_swi_cookie, 0);
2200}
2201
2202static void
2203pfsyncintr(void *arg)
2204{
2205 struct pfsync_softc *sc = arg;
2206 struct mbuf *m, *n;
2207
2208 CURVNET_SET(sc->sc_ifp->if_vnet);
2209
2210 PFSYNC_LOCK(sc);
2211 if ((sc->sc_flags & PFSYNCF_PUSH) && sc->sc_len > PFSYNC_MINPKT) {
2212 pfsync_sendout(0);
2213 sc->sc_flags &= ~PFSYNCF_PUSH;
2214 }
2215 _IF_DEQUEUE_ALL(&sc->sc_ifp->if_snd, m);
2216 PFSYNC_UNLOCK(sc);
2217
2218 for (; m != NULL; m = n) {
2219
2220 n = m->m_nextpkt;
2221 m->m_nextpkt = NULL;
2222
2223 /*
2224 * We distinguish between a deferral packet and our
2225 * own pfsync packet based on M_SKIP_FIREWALL
2226 * flag. This is XXX.
2227 */
2228 if (m->m_flags & M_SKIP_FIREWALL)
2229 ip_output(m, NULL, NULL, 0, NULL, NULL);
2230 else if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo,
2231 NULL) == 0)
2232 V_pfsyncstats.pfsyncs_opackets++;
2233 else
2234 V_pfsyncstats.pfsyncs_oerrors++;
2235 }
2236 CURVNET_RESTORE();
2237}
2238
2239static int
2240pfsync_multicast_setup(struct pfsync_softc *sc, struct ifnet *ifp, void *mship)
2241{
2242 struct ip_moptions *imo = &sc->sc_imo;
2243 int error;
2244
2245 if (!(ifp->if_flags & IFF_MULTICAST))
2246 return (EADDRNOTAVAIL);
2247
2248 imo->imo_membership = (struct in_multi **)mship;
2249 imo->imo_max_memberships = IP_MIN_MEMBERSHIPS;
2250 imo->imo_multicast_vif = -1;
2251
2252 if ((error = in_joingroup(ifp, &sc->sc_sync_peer, NULL,
2253 &imo->imo_membership[0])) != 0) {
2254 imo->imo_membership = NULL;
2255 return (error);
2256 }
2257 imo->imo_num_memberships++;
2258 imo->imo_multicast_ifp = ifp;
2259 imo->imo_multicast_ttl = PFSYNC_DFLTTL;
2260 imo->imo_multicast_loop = 0;
2261
2262 return (0);
2263}
2264
2265static void
2266pfsync_multicast_cleanup(struct pfsync_softc *sc)
2267{
2268 struct ip_moptions *imo = &sc->sc_imo;
2269
2270 in_leavegroup(imo->imo_membership[0], NULL);
2271 free(imo->imo_membership, M_PFSYNC);
2272 imo->imo_membership = NULL;
2273 imo->imo_multicast_ifp = NULL;
2274}
2275
2276#ifdef INET
2277extern struct domain inetdomain;
2278static struct protosw in_pfsync_protosw = {
2279 .pr_type = SOCK_RAW,
2280 .pr_domain = &inetdomain,
2281 .pr_protocol = IPPROTO_PFSYNC,
2282 .pr_flags = PR_ATOMIC|PR_ADDR,
2283 .pr_input = pfsync_input,
2284 .pr_output = (pr_output_t *)rip_output,
2285 .pr_ctloutput = rip_ctloutput,
2286 .pr_usrreqs = &rip_usrreqs
2287};
2288#endif
2289
2290static void
2291pfsync_pointers_init()
2292{
2293
2294 PF_RULES_WLOCK();
2295 pfsync_state_import_ptr = pfsync_state_import;
2296 pfsync_insert_state_ptr = pfsync_insert_state;
2297 pfsync_update_state_ptr = pfsync_update_state;
2298 pfsync_delete_state_ptr = pfsync_delete_state;
2299 pfsync_clear_states_ptr = pfsync_clear_states;
2300 pfsync_defer_ptr = pfsync_defer;
2301 PF_RULES_WUNLOCK();
2302}
2303
2304static void
2305pfsync_pointers_uninit()
2306{
2307
2308 PF_RULES_WLOCK();
2309 pfsync_state_import_ptr = NULL;
2310 pfsync_insert_state_ptr = NULL;
2311 pfsync_update_state_ptr = NULL;
2312 pfsync_delete_state_ptr = NULL;
2313 pfsync_clear_states_ptr = NULL;
2314 pfsync_defer_ptr = NULL;
2315 PF_RULES_WUNLOCK();
2316}
2317
2318static int
2319pfsync_init()
2320{
2321 VNET_ITERATOR_DECL(vnet_iter);
2322 int error = 0;
2323
2324 VNET_LIST_RLOCK();
2325 VNET_FOREACH(vnet_iter) {
2326 CURVNET_SET(vnet_iter);
2327 V_pfsync_cloner = if_clone_simple(pfsyncname,
2328 pfsync_clone_create, pfsync_clone_destroy, 1);
2329 error = swi_add(NULL, pfsyncname, pfsyncintr, V_pfsyncif,
2330 SWI_NET, INTR_MPSAFE, &V_pfsync_swi_cookie);
2331 CURVNET_RESTORE();
2332 if (error)
2333 goto fail_locked;
2334 }
2335 VNET_LIST_RUNLOCK();
2336#ifdef INET
2337 error = pf_proto_register(PF_INET, &in_pfsync_protosw);
2338 if (error)
2339 goto fail;
2340 error = ipproto_register(IPPROTO_PFSYNC);
2341 if (error) {
2342 pf_proto_unregister(PF_INET, IPPROTO_PFSYNC, SOCK_RAW);
2343 goto fail;
2344 }
2345#endif
2346 pfsync_pointers_init();
2347
2348 return (0);
2349
2350fail:
2351 VNET_LIST_RLOCK();
2352fail_locked:
2353 VNET_FOREACH(vnet_iter) {
2354 CURVNET_SET(vnet_iter);
2355 if (V_pfsync_swi_cookie) {
2356 swi_remove(V_pfsync_swi_cookie);
2357 if_clone_detach(V_pfsync_cloner);
2358 }
2359 CURVNET_RESTORE();
2360 }
2361 VNET_LIST_RUNLOCK();
2362
2363 return (error);
2364}
2365
2366static void
2367pfsync_uninit()
2368{
2369 VNET_ITERATOR_DECL(vnet_iter);
2370
2371 pfsync_pointers_uninit();
2372
2373 ipproto_unregister(IPPROTO_PFSYNC);
2374 pf_proto_unregister(PF_INET, IPPROTO_PFSYNC, SOCK_RAW);
2375 VNET_LIST_RLOCK();
2376 VNET_FOREACH(vnet_iter) {
2377 CURVNET_SET(vnet_iter);
2378 if_clone_detach(V_pfsync_cloner);
2379 swi_remove(V_pfsync_swi_cookie);
2380 CURVNET_RESTORE();
2381 }
2382 VNET_LIST_RUNLOCK();
2383}
2384
2385static int
2386pfsync_modevent(module_t mod, int type, void *data)
2387{
2388 int error = 0;
2389
2390 switch (type) {
2391 case MOD_LOAD:
2392 error = pfsync_init();
2393 break;
2394 case MOD_QUIESCE:
2395 /*
2396 * Module should not be unloaded due to race conditions.
2397 */
2398 error = EBUSY;
2399 break;
2400 case MOD_UNLOAD:
2401 pfsync_uninit();
2402 break;
2403 default:
2404 error = EINVAL;
2405 break;
2406 }
2407
2408 return (error);
2409}
2410
2411static moduledata_t pfsync_mod = {
2412 pfsyncname,
2413 pfsync_modevent,
2414 0
2415};
2416
2417#define PFSYNC_MODVER 1
2418
2419DECLARE_MODULE(pfsync, pfsync_mod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);
2420MODULE_VERSION(pfsync, PFSYNC_MODVER);
2421MODULE_DEPEND(pfsync, pf, PF_MODVER, PF_MODVER, PF_MODVER);
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