sys/net/pf/if_pfsync.c

   1 /*
   2  * Copyright (c) 2002 Michael Shalayeff
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
  18  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  19  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  20  * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  22  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  23  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  24  * THE POSSIBILITY OF SUCH DAMAGE.
  25  *
  26  * $OpenBSD: if_pfsync.c,v 1.98 2008/06/29 08:42:15 mcbride Exp $
  27  */
  28
  29 #include "opt_inet.h"
  30 #include "opt_inet6.h"
  31 #include "opt_carp.h"
  32
  33 #include <sys/param.h>
  34 #include <sys/endian.h>
  35 #include <sys/proc.h>
  36 #include <sys/priv.h>
  37 #include <sys/systm.h>
  38 #include <sys/time.h>
  39 #include <sys/mbuf.h>
  40 #include <sys/socket.h>
  41 #include <sys/kernel.h>
  42 #include <sys/malloc.h>
  43 #include <sys/module.h>
  44 #include <sys/msgport2.h>
  45 #include <sys/sockio.h>
  46 #include <sys/thread2.h>
  47
  48 #include <machine/inttypes.h>
  49
  50 #include <net/if.h>
  51 #include <net/if_types.h>
  52 #include <net/ifq_var.h>
  53 #include <net/route.h>
  54 #include <net/bpf.h>
  55 #include <net/netisr2.h>
  56 #include <net/netmsg2.h>
  57 #include <netinet/in.h>
  58 #include <netinet/if_ether.h>
  59 #include <netinet/ip_carp.h>
  60 #include <netinet/tcp.h>
  61 #include <netinet/tcp_seq.h>
  62
  63 #ifdef  INET
  64 #include <netinet/in_systm.h>
  65 #include <netinet/in_var.h>
  66 #include <netinet/ip.h>
  67 #include <netinet/ip_var.h>
  68 #endif
  69
  70 #ifdef INET6
  71 #include <netinet6/nd6.h>
  72 #endif /* INET6 */
  73
  74 #include <net/pf/pfvar.h>
  75 #include <net/pf/if_pfsync.h>
  76
  77 #define PFSYNCNAME      "pfsync"
  78
  79 #define PFSYNC_MINMTU   \
  80     (sizeof(struct pfsync_header) + sizeof(struct pf_state))
  81
  82 #ifdef PFSYNCDEBUG
  83 #define DPRINTF(x)    do { if (pfsyncdebug) kprintf x ; } while (0)
  84 int pfsyncdebug;
  85 #else
  86 #define DPRINTF(x)
  87 #endif
  88
  89 struct pfsync_softc     *pfsyncif = NULL;
  90 struct pfsyncstats       pfsyncstats;
  91
  92 void    pfsyncattach(int);
  93 static int      pfsync_clone_destroy(struct ifnet *);
  94 static int      pfsync_clone_create(struct if_clone *, int, caddr_t);
  95 void    pfsync_setmtu(struct pfsync_softc *, int);
  96 int     pfsync_alloc_scrub_memory(struct pfsync_state_peer *,
  97             struct pf_state_peer *);
  98 int     pfsyncoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
  99             struct rtentry *);
 100 int     pfsyncioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
 101 void    pfsyncstart(struct ifnet *, struct ifaltq_subque *);
 102
 103 struct mbuf *pfsync_get_mbuf(struct pfsync_softc *, u_int8_t, void **);
 104 int     pfsync_request_update(struct pfsync_state_upd *, struct in_addr *);
 105 int     pfsync_sendout(struct pfsync_softc *);
 106 int     pfsync_sendout_mbuf(struct pfsync_softc *, struct mbuf *);
 107 void    pfsync_timeout(void *);
 108 void    pfsync_send_bus(struct pfsync_softc *, u_int8_t);
 109 void    pfsync_bulk_update(void *);
 110 void    pfsync_bulkfail(void *);
 111
 112 static struct in_multi *pfsync_in_addmulti(struct ifnet *);
 113 static void pfsync_in_delmulti(struct in_multi *);
 114
 115 static MALLOC_DEFINE(M_PFSYNC, PFSYNCNAME, "Packet Filter State Sync. Interface");
 116 static LIST_HEAD(pfsync_list, pfsync_softc) pfsync_list;
 117
 118 int     pfsync_sync_ok;
 119
 120 struct if_clone pfsync_cloner =
 121     IF_CLONE_INITIALIZER("pfsync", pfsync_clone_create, pfsync_clone_destroy, 1 ,1);
 122
 123 void
 124 pfsyncattach(int npfsync)
 125 {
 126         if_clone_attach(&pfsync_cloner);
 127 }
 128 static int
 129 pfsync_clone_create(struct if_clone *ifc, int unit, caddr_t param __unused)
 130 {
 131         struct pfsync_softc *sc;
 132         struct ifnet *ifp;
 133
 134         lwkt_gettoken(&pf_token);
 135
 136         sc = kmalloc(sizeof(*sc), M_PFSYNC, M_WAITOK | M_ZERO);
 137         pfsync_sync_ok = 1;
 138         sc->sc_mbuf = NULL;
 139         sc->sc_mbuf_net = NULL;
 140         sc->sc_mbuf_tdb = NULL;
 141         sc->sc_statep.s = NULL;
 142         sc->sc_statep_net.s = NULL;
 143         sc->sc_statep_tdb.t = NULL;
 144         sc->sc_maxupdates = 128;
 145         sc->sc_sync_peer.s_addr =htonl(INADDR_PFSYNC_GROUP);
 146         sc->sc_sendaddr.s_addr = htonl(INADDR_PFSYNC_GROUP);
 147         sc->sc_ureq_received = 0;
 148         sc->sc_ureq_sent = 0;
 149         sc->sc_bulk_send_next = NULL;
 150         sc->sc_bulk_terminator = NULL;
 151         sc->sc_bulk_send_cpu = 0;
 152         sc->sc_bulk_terminator_cpu = 0;
 153         sc->sc_imo.imo_max_memberships = IP_MAX_MEMBERSHIPS;
 154         lwkt_reltoken(&pf_token);
 155         ifp = &sc->sc_if;
 156         ksnprintf(ifp->if_xname, sizeof ifp->if_xname, "pfsync%d", unit);
 157         if_initname(ifp, ifc->ifc_name, unit);
 158         ifp->if_ioctl = pfsyncioctl;
 159         ifp->if_output = pfsyncoutput;
 160         ifp->if_start = pfsyncstart;
 161         ifp->if_type = IFT_PFSYNC;
 162         ifq_set_maxlen(&ifp->if_snd, ifqmaxlen);
 163         ifp->if_hdrlen = PFSYNC_HDRLEN;
 164         ifp->if_baudrate = IF_Mbps(100);
 165         ifp->if_softc = sc;
 166         pfsync_setmtu(sc, MCLBYTES);
 167         callout_init(&sc->sc_tmo);
 168         /* callout_init(&sc->sc_tdb_tmo); XXX we don't support tdb (yet) */
 169         callout_init(&sc->sc_bulk_tmo);
 170         callout_init(&sc->sc_bulkfail_tmo);
 171         if_attach(ifp, NULL);
 172
 173         LIST_INSERT_HEAD(&pfsync_list, sc, sc_next);
 174
 175
 176 #if NCARP > 0
 177         if_addgroup(ifp, "carp");
 178 #endif
 179
 180 #if NBPFILTER > 0
 181         bpfattach(&sc->sc_if, DLT_PFSYNC, PFSYNC_HDRLEN);
 182 #endif
 183         lwkt_gettoken(&pf_token);
 184
 185         lwkt_reltoken(&pf_token);
 186         return (0);
 187 }
 188
 189 static int
 190 pfsync_clone_destroy(struct ifnet *ifp)
 191 {
 192         struct netmsg_base msg;
 193
 194         lwkt_gettoken(&pf_token);
 195         lwkt_reltoken(&pf_token);
 196
 197         struct pfsync_softc *sc = ifp->if_softc;
 198         callout_stop(&sc->sc_tmo);
 199         /* callout_stop(&sc->sc_tdb_tmo); XXX we don't support tdb (yet) */
 200         callout_stop(&sc->sc_bulk_tmo);
 201         callout_stop(&sc->sc_bulkfail_tmo);
 202 #if NCARP > 0
 203         if (!pfsync_sync_ok)
 204                 carp_group_demote_adj(&sc->sc_if, -1);
 205 #endif
 206
 207         /* Unpend async sendouts. */
 208         netmsg_init(&msg, NULL, &curthread->td_msgport, 0, netmsg_sync_handler);
 209         netisr_domsg(&msg, 0);
 210
 211 #if NBPFILTER > 0
 212         bpfdetach(ifp);
 213 #endif
 214         if_detach(ifp);
 215         lwkt_gettoken(&pf_token);
 216         LIST_REMOVE(sc, sc_next);
 217         kfree(sc, M_PFSYNC);
 218         lwkt_reltoken(&pf_token);
 219
 220
 221         return 0;
 222 }
 223
 224 /*
 225  * Start output on the pfsync interface.
 226  */
 227 void
 228 pfsyncstart(struct ifnet *ifp, struct ifaltq_subque *ifsq)
 229 {
 230         ASSERT_ALTQ_SQ_DEFAULT(ifp, ifsq);
 231         ifsq_purge(ifsq);
 232 }
 233
 234 int
 235 pfsync_alloc_scrub_memory(struct pfsync_state_peer *s,
 236     struct pf_state_peer *d)
 237 {
 238         if (s->scrub.scrub_flag && d->scrub == NULL) {
 239                 d->scrub = kmalloc(sizeof(struct pf_state_scrub), M_PFSYNC, M_NOWAIT|M_ZERO);
 240
 241                 if (d->scrub == NULL)
 242                         return (ENOMEM);
 243         }
 244
 245         return (0);
 246 }
 247
 248 void
 249 pfsync_state_export(struct pfsync_state *sp, struct pf_state *st)
 250 {
 251         bzero(sp, sizeof(struct pfsync_state));
 252
 253         /* copy from state key */
 254         sp->key[PF_SK_WIRE].addr[0] = st->key[PF_SK_WIRE]->addr[0];
 255         sp->key[PF_SK_WIRE].addr[1] = st->key[PF_SK_WIRE]->addr[1];
 256         sp->key[PF_SK_WIRE].port[0] = st->key[PF_SK_WIRE]->port[0];
 257         sp->key[PF_SK_WIRE].port[1] = st->key[PF_SK_WIRE]->port[1];
 258         sp->key[PF_SK_STACK].addr[0] = st->key[PF_SK_STACK]->addr[0];
 259         sp->key[PF_SK_STACK].addr[1] = st->key[PF_SK_STACK]->addr[1];
 260         sp->key[PF_SK_STACK].port[0] = st->key[PF_SK_STACK]->port[0];
 261         sp->key[PF_SK_STACK].port[1] = st->key[PF_SK_STACK]->port[1];
 262         sp->proto = st->key[PF_SK_WIRE]->proto;
 263         sp->af = st->key[PF_SK_WIRE]->af;
 264
 265         /* copy from state */
 266         strlcpy(sp->ifname, st->kif->pfik_name, sizeof(sp->ifname));
 267         bcopy(&st->rt_addr, &sp->rt_addr, sizeof(sp->rt_addr));
 268         sp->creation = htonl(time_second - st->creation);
 269         sp->expire = pf_state_expires(st);
 270         if (sp->expire <= time_second)
 271                 sp->expire = htonl(0);
 272         else
 273                 sp->expire = htonl(sp->expire - time_second);
 274
 275         sp->direction = st->direction;
 276         sp->log = st->log;
 277         sp->cpuid = st->cpuid;
 278         sp->pickup_mode = st->pickup_mode;
 279         sp->timeout = st->timeout;
 280         sp->state_flags = st->state_flags;
 281         if (st->src_node)
 282                 sp->sync_flags |= PFSYNC_FLAG_SRCNODE;
 283         if (st->nat_src_node)
 284                 sp->sync_flags |= PFSYNC_FLAG_NATSRCNODE;
 285
 286         bcopy(&st->id, &sp->id, sizeof(sp->id));
 287         sp->creatorid = st->creatorid;
 288         pf_state_peer_hton(&st->src, &sp->src);
 289         pf_state_peer_hton(&st->dst, &sp->dst);
 290
 291         if (st->rule.ptr == NULL)
 292                 sp->rule = htonl(-1);
 293         else
 294                 sp->rule = htonl(st->rule.ptr->nr);
 295         if (st->anchor.ptr == NULL)
 296                 sp->anchor = htonl(-1);
 297         else
 298                 sp->anchor = htonl(st->anchor.ptr->nr);
 299         if (st->nat_rule.ptr == NULL)
 300                 sp->nat_rule = htonl(-1);
 301         else
 302                 sp->nat_rule = htonl(st->nat_rule.ptr->nr);
 303
 304         pf_state_counter_hton(st->packets[0], sp->packets[0]);
 305         pf_state_counter_hton(st->packets[1], sp->packets[1]);
 306         pf_state_counter_hton(st->bytes[0], sp->bytes[0]);
 307         pf_state_counter_hton(st->bytes[1], sp->bytes[1]);
 308
 309 }
 310
 311 int
 312 pfsync_state_import(struct pfsync_state *sp, u_int8_t flags)
 313 {
 314         struct pf_state *st = NULL;
 315         struct pf_state_key *skw = NULL, *sks = NULL;
 316         struct pf_rule *r = NULL;
 317         struct pfi_kif  *kif;
 318         int pool_flags;
 319         int error;
 320
 321         if (sp->creatorid == 0 && pf_status.debug >= PF_DEBUG_MISC) {
 322                 kprintf("pfsync_insert_net_state: invalid creator id:"
 323                     " %08x\n", ntohl(sp->creatorid));
 324                 return (EINVAL);
 325         }
 326
 327         if ((kif = pfi_kif_get(sp->ifname)) == NULL) {
 328                 if (pf_status.debug >= PF_DEBUG_MISC)
 329                         kprintf("pfsync_insert_net_state: "
 330                             "unknown interface: %s\n", sp->ifname);
 331                 if (flags & PFSYNC_SI_IOCTL)
 332                         return (EINVAL);
 333                 return (0);     /* skip this state */
 334         }
 335
 336         /*
 337          * If the ruleset checksums match or the state is coming from the ioctl,
 338          * it's safe to associate the state with the rule of that number.
 339          */
 340         if (sp->rule != htonl(-1) && sp->anchor == htonl(-1) &&
 341             (flags & (PFSYNC_SI_IOCTL | PFSYNC_SI_CKSUM)) && ntohl(sp->rule) <
 342             pf_main_ruleset.rules[PF_RULESET_FILTER].active.rcount)
 343                 r = pf_main_ruleset.rules[
 344                     PF_RULESET_FILTER].active.ptr_array[ntohl(sp->rule)];
 345         else
 346                 r = &pf_default_rule;
 347
 348         if ((r->max_states && r->states_cur >= r->max_states))
 349                 goto cleanup;
 350
 351         if (flags & PFSYNC_SI_IOCTL)
 352                 pool_flags = M_WAITOK | M_NULLOK | M_ZERO;
 353         else
 354                 pool_flags = M_WAITOK | M_ZERO;
 355
 356         if ((st = kmalloc(sizeof(struct pf_state), M_PFSYNC, pool_flags)) == NULL)
 357                 goto cleanup;
 358         lockinit(&st->lk, "pfstlk", 0, 0);
 359
 360         if ((skw = pf_alloc_state_key(pool_flags)) == NULL)
 361                 goto cleanup;
 362
 363         if (PF_ANEQ(&sp->key[PF_SK_WIRE].addr[0],
 364             &sp->key[PF_SK_STACK].addr[0], sp->af) ||
 365             PF_ANEQ(&sp->key[PF_SK_WIRE].addr[1],
 366             &sp->key[PF_SK_STACK].addr[1], sp->af) ||
 367             sp->key[PF_SK_WIRE].port[0] != sp->key[PF_SK_STACK].port[0] ||
 368             sp->key[PF_SK_WIRE].port[1] != sp->key[PF_SK_STACK].port[1]) {
 369                 if ((sks = pf_alloc_state_key(pool_flags)) == NULL)
 370                         goto cleanup;
 371         } else
 372                 sks = skw;
 373
 374         /* allocate memory for scrub info */
 375         if (pfsync_alloc_scrub_memory(&sp->src, &st->src) ||
 376             pfsync_alloc_scrub_memory(&sp->dst, &st->dst))
 377                 goto cleanup;
 378
 379         /* copy to state key(s) */
 380         skw->addr[0] = sp->key[PF_SK_WIRE].addr[0];
 381         skw->addr[1] = sp->key[PF_SK_WIRE].addr[1];
 382         skw->port[0] = sp->key[PF_SK_WIRE].port[0];
 383         skw->port[1] = sp->key[PF_SK_WIRE].port[1];
 384         skw->proto = sp->proto;
 385         skw->af = sp->af;
 386         if (sks != skw) {
 387                 sks->addr[0] = sp->key[PF_SK_STACK].addr[0];
 388                 sks->addr[1] = sp->key[PF_SK_STACK].addr[1];
 389                 sks->port[0] = sp->key[PF_SK_STACK].port[0];
 390                 sks->port[1] = sp->key[PF_SK_STACK].port[1];
 391                 sks->proto = sp->proto;
 392                 sks->af = sp->af;
 393         }
 394
 395         /* copy to state */
 396         bcopy(&sp->rt_addr, &st->rt_addr, sizeof(st->rt_addr));
 397         st->creation = time_second - ntohl(sp->creation);
 398         st->expire = time_second;
 399         if (sp->expire) {
 400                 /* XXX No adaptive scaling. */
 401                 st->expire -= r->timeout[sp->timeout] - ntohl(sp->expire);
 402         }
 403
 404         st->expire = ntohl(sp->expire) + time_second;
 405         st->direction = sp->direction;
 406         st->log = sp->log;
 407         st->timeout = sp->timeout;
 408         st->state_flags = sp->state_flags;
 409         if (!(flags & PFSYNC_SI_IOCTL))
 410                 st->sync_flags = PFSTATE_FROMSYNC;
 411
 412         bcopy(sp->id, &st->id, sizeof(st->id));
 413         st->creatorid = sp->creatorid;
 414         pf_state_peer_ntoh(&sp->src, &st->src);
 415         pf_state_peer_ntoh(&sp->dst, &st->dst);
 416
 417         st->rule.ptr = r;
 418         st->nat_rule.ptr = NULL;
 419         st->anchor.ptr = NULL;
 420         st->rt_kif = NULL;
 421
 422         st->pfsync_time = 0;
 423
 424
 425         /* XXX when we have nat_rule/anchors, use STATE_INC_COUNTERS */
 426         r->states_cur++;
 427         r->states_tot++;
 428
 429         if ((error = pf_state_insert(kif, skw, sks, st)) != 0) {
 430                 /* XXX when we have nat_rule/anchors, use STATE_DEC_COUNTERS */
 431                 r->states_cur--;
 432                 goto cleanup_state;
 433         }
 434
 435         return (0);
 436
 437  cleanup:
 438         error = ENOMEM;
 439         if (skw == sks)
 440                 sks = NULL;
 441         if (skw != NULL)
 442                 kfree(skw, M_PFSYNC);
 443         if (sks != NULL)
 444                 kfree(sks, M_PFSYNC);
 445
 446  cleanup_state: /* pf_state_insert frees the state keys */
 447         if (st) {
 448                 if (st->dst.scrub)
 449                         kfree(st->dst.scrub, M_PFSYNC);
 450                 if (st->src.scrub)
 451                         kfree(st->src.scrub, M_PFSYNC);
 452                 kfree(st, M_PFSYNC);
 453         }
 454         return (error);
 455 }
 456
 457 void
 458 pfsync_input(struct mbuf *m, ...)
 459 {
 460         struct ip *ip = mtod(m, struct ip *);
 461         struct pfsync_header *ph;
 462         struct pfsync_softc *sc = pfsyncif;
 463         struct pf_state *st;
 464         struct pf_state_key *sk;
 465         struct pf_state_item *si;
 466         struct pf_state_cmp id_key;
 467         struct pfsync_state *sp;
 468         struct pfsync_state_upd *up;
 469         struct pfsync_state_del *dp;
 470         struct pfsync_state_clr *cp;
 471         struct pfsync_state_upd_req *rup;
 472         struct pfsync_state_bus *bus;
 473         struct in_addr src;
 474         struct mbuf *mp;
 475         int iplen, action, error, i, count, offp, sfail, stale = 0;
 476         u_int8_t flags = 0;
 477
 478         /* This function is not yet called from anywhere */
 479         /* Still we assume for safety that pf_token must be held */
 480         ASSERT_LWKT_TOKEN_HELD(&pf_token);
 481
 482         pfsyncstats.pfsyncs_ipackets++;
 483
 484         /* verify that we have a sync interface configured */
 485         if (!sc || !sc->sc_sync_ifp || !pf_status.running)
 486                 goto done;
 487
 488         /* verify that the packet came in on the right interface */
 489         if (sc->sc_sync_ifp != m->m_pkthdr.rcvif) {
 490                 pfsyncstats.pfsyncs_badif++;
 491                 goto done;
 492         }
 493
 494         /* verify that the IP TTL is 255.  */
 495         if (ip->ip_ttl != PFSYNC_DFLTTL) {
 496                 pfsyncstats.pfsyncs_badttl++;
 497                 goto done;
 498         }
 499
 500         iplen = ip->ip_hl << 2;
 501
 502         if (m->m_pkthdr.len < iplen + sizeof(*ph)) {
 503                 pfsyncstats.pfsyncs_hdrops++;
 504                 goto done;
 505         }
 506
 507         if (iplen + sizeof(*ph) > m->m_len) {
 508                 if ((m = m_pullup(m, iplen + sizeof(*ph))) == NULL) {
 509                         pfsyncstats.pfsyncs_hdrops++;
 510                         goto done;
 511                 }
 512                 ip = mtod(m, struct ip *);
 513         }
 514         ph = (struct pfsync_header *)((char *)ip + iplen);
 515
 516         /* verify the version */
 517         if (ph->version != PFSYNC_VERSION) {
 518                 pfsyncstats.pfsyncs_badver++;
 519                 goto done;
 520         }
 521
 522         action = ph->action;
 523         count = ph->count;
 524
 525         /* make sure it's a valid action code */
 526         if (action >= PFSYNC_ACT_MAX) {
 527                 pfsyncstats.pfsyncs_badact++;
 528                 goto done;
 529         }
 530
 531         /* Cheaper to grab this now than having to mess with mbufs later */
 532         src = ip->ip_src;
 533
 534         if (!bcmp(&ph->pf_chksum, &pf_status.pf_chksum, PF_MD5_DIGEST_LENGTH))
 535                 flags |= PFSYNC_SI_CKSUM;
 536
 537         switch (action) {
 538         case PFSYNC_ACT_CLR: {
 539                 struct pf_state *nexts;
 540                 struct pf_state_key *nextsk;
 541                 struct pfi_kif *kif;
 542                 globaldata_t save_gd = mycpu;
 543                 int nn;
 544
 545                 u_int32_t creatorid;
 546                 if ((mp = m_pulldown(m, iplen + sizeof(*ph),
 547                     sizeof(*cp), &offp)) == NULL) {
 548                         pfsyncstats.pfsyncs_badlen++;
 549                         return;
 550                 }
 551                 cp = (struct pfsync_state_clr *)(mp->m_data + offp);
 552                 creatorid = cp->creatorid;
 553
 554                 crit_enter();
 555                 if (cp->ifname[0] == '\0') {
 556                         lwkt_gettoken(&pf_token);
 557                         for (nn = 0; nn < ncpus; ++nn) {
 558                                 lwkt_setcpu_self(globaldata_find(nn));
 559                                 for (st = RB_MIN(pf_state_tree_id,
 560                                                  &tree_id[nn]);
 561                                      st; st = nexts) {
 562                                         nexts = RB_NEXT(pf_state_tree_id,
 563                                                         &tree_id[n], st);
 564                                         if (st->creatorid == creatorid) {
 565                                                 st->sync_flags |=
 566                                                         PFSTATE_FROMSYNC;
 567                                                 pf_unlink_state(st);
 568                                         }
 569                                 }
 570                         }
 571                         lwkt_setcpu_self(save_gd);
 572                         lwkt_reltoken(&pf_token);
 573                 } else {
 574                         if ((kif = pfi_kif_get(cp->ifname)) == NULL) {
 575                                 crit_exit();
 576                                 return;
 577                         }
 578                         /* XXX correct? */
 579                         lwkt_gettoken(&pf_token);
 580                         for (nn = 0; nn < ncpus; ++nn) {
 581                                 lwkt_setcpu_self(globaldata_find(nn));
 582                                 for (sk = RB_MIN(pf_state_tree,
 583                                                  &pf_statetbl[nn]);
 584                                      sk;
 585                                      sk = nextsk) {
 586                                         nextsk = RB_NEXT(pf_state_tree,
 587                                             &pf_statetbl[n], sk);
 588                                         TAILQ_FOREACH(si, &sk->states, entry) {
 589                                                 if (si->s->creatorid ==
 590                                                     creatorid) {
 591                                                         si->s->sync_flags |=
 592                                                             PFSTATE_FROMSYNC;
 593                                                         pf_unlink_state(si->s);
 594                                                 }
 595                                         }
 596                                 }
 597                         }
 598                         lwkt_setcpu_self(save_gd);
 599                         lwkt_reltoken(&pf_token);
 600                 }
 601                 crit_exit();
 602
 603                 break;
 604         }
 605         case PFSYNC_ACT_INS:
 606                 if ((mp = m_pulldown(m, iplen + sizeof(*ph),
 607                     count * sizeof(*sp), &offp)) == NULL) {
 608                         pfsyncstats.pfsyncs_badlen++;
 609                         return;
 610                 }
 611
 612                 crit_enter();
 613                 for (i = 0, sp = (struct pfsync_state *)(mp->m_data + offp);
 614                     i < count; i++, sp++) {
 615                         /* check for invalid values */
 616                         if (sp->timeout >= PFTM_MAX ||
 617                             sp->src.state > PF_TCPS_PROXY_DST ||
 618                             sp->dst.state > PF_TCPS_PROXY_DST ||
 619                             sp->direction > PF_OUT ||
 620                             (sp->af != AF_INET && sp->af != AF_INET6)) {
 621                                 if (pf_status.debug >= PF_DEBUG_MISC)
 622                                         kprintf("pfsync_insert: PFSYNC_ACT_INS: "
 623                                             "invalid value\n");
 624                                 pfsyncstats.pfsyncs_badval++;
 625                                 continue;
 626                         }
 627
 628                         if ((error = pfsync_state_import(sp, flags))) {
 629                                 if (error == ENOMEM) {
 630                                         crit_exit();
 631                                         goto done;
 632                                 }
 633                         }
 634                 }
 635                 crit_exit();
 636                 break;
 637         case PFSYNC_ACT_UPD:
 638                 if ((mp = m_pulldown(m, iplen + sizeof(*ph),
 639                     count * sizeof(*sp), &offp)) == NULL) {
 640                         pfsyncstats.pfsyncs_badlen++;
 641                         return;
 642                 }
 643
 644                 crit_enter();
 645                 for (i = 0, sp = (struct pfsync_state *)(mp->m_data + offp);
 646                     i < count; i++, sp++) {
 647                         int flags = PFSYNC_FLAG_STALE;
 648
 649                         /* check for invalid values */
 650                         if (sp->timeout >= PFTM_MAX ||
 651                             sp->src.state > PF_TCPS_PROXY_DST ||
 652                             sp->dst.state > PF_TCPS_PROXY_DST) {
 653                                 if (pf_status.debug >= PF_DEBUG_MISC)
 654                                         kprintf("pfsync_insert: PFSYNC_ACT_UPD: "
 655                                             "invalid value\n");
 656                                 pfsyncstats.pfsyncs_badval++;
 657                                 continue;
 658                         }
 659
 660                         bcopy(sp->id, &id_key.id, sizeof(id_key.id));
 661                         id_key.creatorid = sp->creatorid;
 662
 663                         st = pf_find_state_byid(&id_key);
 664                         if (st == NULL) {
 665                                 /* insert the update */
 666                                 if (pfsync_state_import(sp, flags))
 667                                         pfsyncstats.pfsyncs_badstate++;
 668                                 continue;
 669                         }
 670                         sk = st->key[PF_SK_WIRE];       /* XXX right one? */
 671                         sfail = 0;
 672                         if (sk->proto == IPPROTO_TCP) {
 673                                 /*
 674                                  * The state should never go backwards except
 675                                  * for syn-proxy states.  Neither should the
 676                                  * sequence window slide backwards.
 677                                  */
 678                                 if (st->src.state > sp->src.state &&
 679                                     (st->src.state < PF_TCPS_PROXY_SRC ||
 680                                     sp->src.state >= PF_TCPS_PROXY_SRC))
 681                                         sfail = 1;
 682                                 else if (SEQ_GT(st->src.seqlo,
 683                                     ntohl(sp->src.seqlo)))
 684                                         sfail = 3;
 685                                 else if (st->dst.state > sp->dst.state) {
 686                                         /* There might still be useful
 687                                          * information about the src state here,
 688                                          * so import that part of the update,
 689                                          * then "fail" so we send the updated
 690                                          * state back to the peer who is missing
 691                                          * our what we know. */
 692                                         pf_state_peer_ntoh(&sp->src, &st->src);
 693                                         /* XXX do anything with timeouts? */
 694                                         sfail = 7;
 695                                         flags = 0;
 696                                 } else if (st->dst.state >= TCPS_SYN_SENT &&
 697                                     SEQ_GT(st->dst.seqlo, ntohl(sp->dst.seqlo)))
 698                                         sfail = 4;
 699                         } else {
 700                                 /*
 701                                  * Non-TCP protocol state machine always go
 702                                  * forwards
 703                                  */
 704                                 if (st->src.state > sp->src.state)
 705                                         sfail = 5;
 706                                 else if (st->dst.state > sp->dst.state)
 707                                         sfail = 6;
 708                         }
 709                         if (sfail) {
 710                                 if (pf_status.debug >= PF_DEBUG_MISC)
 711                                         kprintf("pfsync: %s stale update "
 712                                             "(%d) id: %016jx "
 713                                             "creatorid: %08x\n",
 714                                             (sfail < 7 ?  "ignoring"
 715                                              : "partial"), sfail,
 716                                             (uintmax_t)be64toh(st->id),
 717                                             ntohl(st->creatorid));
 718                                 pfsyncstats.pfsyncs_stale++;
 719
 720                                 if (!(sp->sync_flags & PFSTATE_STALE)) {
 721                                         /* we have a better state, send it */
 722                                         if (sc->sc_mbuf != NULL && !stale)
 723                                                 pfsync_sendout(sc);
 724                                         stale++;
 725                                         if (!st->sync_flags)
 726                                                 pfsync_pack_state(
 727                                                     PFSYNC_ACT_UPD, st, flags);
 728                                 }
 729                                 continue;
 730                         }
 731                         pfsync_alloc_scrub_memory(&sp->dst, &st->dst);
 732                         pf_state_peer_ntoh(&sp->src, &st->src);
 733                         pf_state_peer_ntoh(&sp->dst, &st->dst);
 734                         st->expire = ntohl(sp->expire) + time_second;
 735                         st->timeout = sp->timeout;
 736                 }
 737                 if (stale && sc->sc_mbuf != NULL)
 738                         pfsync_sendout(sc);
 739                 crit_exit();
 740                 break;
 741         /*
 742          * It's not strictly necessary for us to support the "uncompressed"
 743          * delete action, but it's relatively simple and maintains consistency.
 744          */
 745         case PFSYNC_ACT_DEL:
 746                 if ((mp = m_pulldown(m, iplen + sizeof(*ph),
 747                     count * sizeof(*sp), &offp)) == NULL) {
 748                         pfsyncstats.pfsyncs_badlen++;
 749                         return;
 750                 }
 751
 752                 crit_enter();
 753                 for (i = 0, sp = (struct pfsync_state *)(mp->m_data + offp);
 754                     i < count; i++, sp++) {
 755                         bcopy(sp->id, &id_key.id, sizeof(id_key.id));
 756                         id_key.creatorid = sp->creatorid;
 757
 758                         st = pf_find_state_byid(&id_key);
 759                         if (st == NULL) {
 760                                 pfsyncstats.pfsyncs_badstate++;
 761                                 continue;
 762                         }
 763                         st->sync_flags |= PFSTATE_FROMSYNC;
 764                         pf_unlink_state(st);
 765                 }
 766                 crit_exit();
 767                 break;
 768         case PFSYNC_ACT_UPD_C: {
 769                 int update_requested = 0;
 770
 771                 if ((mp = m_pulldown(m, iplen + sizeof(*ph),
 772                     count * sizeof(*up), &offp)) == NULL) {
 773                         pfsyncstats.pfsyncs_badlen++;
 774                         return;
 775                 }
 776
 777                 crit_enter();
 778                 for (i = 0, up = (struct pfsync_state_upd *)(mp->m_data + offp);
 779                     i < count; i++, up++) {
 780                         /* check for invalid values */
 781                         if (up->timeout >= PFTM_MAX ||
 782                             up->src.state > PF_TCPS_PROXY_DST ||
 783                             up->dst.state > PF_TCPS_PROXY_DST) {
 784                                 if (pf_status.debug >= PF_DEBUG_MISC)
 785                                         kprintf("pfsync_insert: "
 786                                             "PFSYNC_ACT_UPD_C: "
 787                                             "invalid value\n");
 788                                 pfsyncstats.pfsyncs_badval++;
 789                                 continue;
 790                         }
 791
 792                         bcopy(up->id, &id_key.id, sizeof(id_key.id));
 793                         id_key.creatorid = up->creatorid;
 794
 795                         st = pf_find_state_byid(&id_key);
 796                         if (st == NULL) {
 797                                 /* We don't have this state. Ask for it. */
 798                                 error = pfsync_request_update(up, &src);
 799                                 if (error == ENOMEM) {
 800                                         crit_exit();
 801                                         goto done;
 802                                 }
 803                                 update_requested = 1;
 804                                 pfsyncstats.pfsyncs_badstate++;
 805                                 continue;
 806                         }
 807                         sk = st->key[PF_SK_WIRE]; /* XXX right one? */
 808                         sfail = 0;
 809                         if (sk->proto == IPPROTO_TCP) {
 810                                 /*
 811                                  * The state should never go backwards except
 812                                  * for syn-proxy states.  Neither should the
 813                                  * sequence window slide backwards.
 814                                  */
 815                                 if (st->src.state > up->src.state &&
 816                                     (st->src.state < PF_TCPS_PROXY_SRC ||
 817                                     up->src.state >= PF_TCPS_PROXY_SRC))
 818                                         sfail = 1;
 819                                 else if (st->dst.state > up->dst.state)
 820                                         sfail = 2;
 821                                 else if (SEQ_GT(st->src.seqlo,
 822                                     ntohl(up->src.seqlo)))
 823                                         sfail = 3;
 824                                 else if (st->dst.state >= TCPS_SYN_SENT &&
 825                                     SEQ_GT(st->dst.seqlo, ntohl(up->dst.seqlo)))
 826                                         sfail = 4;
 827                         } else {
 828                                 /*
 829                                  * Non-TCP protocol state machine always go
 830                                  * forwards
 831                                  */
 832                                 if (st->src.state > up->src.state)
 833                                         sfail = 5;
 834                                 else if (st->dst.state > up->dst.state)
 835                                         sfail = 6;
 836                         }
 837                         if (sfail) {
 838                                 if (pf_status.debug >= PF_DEBUG_MISC)
 839                                         kprintf("pfsync: ignoring stale update "
 840                                             "(%d) id: %016" PRIx64 " "
 841                                             "creatorid: %08x\n", sfail,
 842                                             be64toh(st->id),
 843                                             ntohl(st->creatorid));
 844                                 pfsyncstats.pfsyncs_stale++;
 845
 846                                 /* we have a better state, send it out */
 847                                 if ((!stale || update_requested) &&
 848                                     sc->sc_mbuf != NULL) {
 849                                         pfsync_sendout(sc);
 850                                         update_requested = 0;
 851                                 }
 852                                 stale++;
 853                                 if (!st->sync_flags)
 854                                         pfsync_pack_state(PFSYNC_ACT_UPD, st,
 855                                             PFSYNC_FLAG_STALE);
 856                                 continue;
 857                         }
 858                         pfsync_alloc_scrub_memory(&up->dst, &st->dst);
 859                         pf_state_peer_ntoh(&up->src, &st->src);
 860                         pf_state_peer_ntoh(&up->dst, &st->dst);
 861                         st->expire = ntohl(up->expire) + time_second;
 862                         st->timeout = up->timeout;
 863                 }
 864                 if ((update_requested || stale) && sc->sc_mbuf)
 865                         pfsync_sendout(sc);
 866                 crit_exit();
 867                 break;
 868         }
 869         case PFSYNC_ACT_DEL_C:
 870                 if ((mp = m_pulldown(m, iplen + sizeof(*ph),
 871                     count * sizeof(*dp), &offp)) == NULL) {
 872                         pfsyncstats.pfsyncs_badlen++;
 873                         return;
 874                 }
 875
 876                 crit_enter();
 877                 for (i = 0, dp = (struct pfsync_state_del *)(mp->m_data + offp);
 878                     i < count; i++, dp++) {
 879                         bcopy(dp->id, &id_key.id, sizeof(id_key.id));
 880                         id_key.creatorid = dp->creatorid;
 881
 882                         st = pf_find_state_byid(&id_key);
 883                         if (st == NULL) {
 884                                 pfsyncstats.pfsyncs_badstate++;
 885                                 continue;
 886                         }
 887                         st->sync_flags |= PFSTATE_FROMSYNC;
 888                         pf_unlink_state(st);
 889                 }
 890                 crit_exit();
 891                 break;
 892         case PFSYNC_ACT_INS_F:
 893         case PFSYNC_ACT_DEL_F:
 894                 /* not implemented */
 895                 break;
 896         case PFSYNC_ACT_UREQ:
 897                 if ((mp = m_pulldown(m, iplen + sizeof(*ph),
 898                     count * sizeof(*rup), &offp)) == NULL) {
 899                         pfsyncstats.pfsyncs_badlen++;
 900                         return;
 901                 }
 902
 903                 crit_enter();
 904                 if (sc->sc_mbuf != NULL)
 905                         pfsync_sendout(sc);
 906                 for (i = 0,
 907                     rup = (struct pfsync_state_upd_req *)(mp->m_data + offp);
 908                     i < count; i++, rup++) {
 909                         bcopy(rup->id, &id_key.id, sizeof(id_key.id));
 910                         id_key.creatorid = rup->creatorid;
 911
 912                         if (id_key.id == 0 && id_key.creatorid == 0) {
 913                                 sc->sc_ureq_received = mycpu->gd_time_seconds;
 914                                 if (sc->sc_bulk_send_next == NULL) {
 915                                         if (++sc->sc_bulk_send_cpu >= ncpus)
 916                                                 sc->sc_bulk_send_cpu = 0;
 917                                         sc->sc_bulk_send_next =
 918                                             TAILQ_FIRST(&state_list[sc->sc_bulk_send_cpu]);
 919                                 }
 920                                 sc->sc_bulk_terminator =
 921                                         sc->sc_bulk_send_next;
 922                                 sc->sc_bulk_terminator_cpu =
 923                                         sc->sc_bulk_send_cpu;
 924                                 if (pf_status.debug >= PF_DEBUG_MISC)
 925                                         kprintf("pfsync: received "
 926                                             "bulk update request\n");
 927                                 pfsync_send_bus(sc, PFSYNC_BUS_START);
 928                                 lwkt_reltoken(&pf_token);
 929                                 callout_init(&sc->sc_bulk_tmo);
 930                                 lwkt_gettoken(&pf_token);
 931                         } else {
 932                                 st = pf_find_state_byid(&id_key);
 933                                 if (st == NULL) {
 934                                         pfsyncstats.pfsyncs_badstate++;
 935                                         continue;
 936                                 }
 937                                 if (!st->sync_flags)
 938                                         pfsync_pack_state(PFSYNC_ACT_UPD,
 939                                             st, 0);
 940                         }
 941                 }
 942                 if (sc->sc_mbuf != NULL)
 943                         pfsync_sendout(sc);
 944                 crit_exit();
 945                 break;
 946         case PFSYNC_ACT_BUS:
 947                 /* If we're not waiting for a bulk update, who cares. */
 948                 if (sc->sc_ureq_sent == 0)
 949                         break;
 950
 951                 if ((mp = m_pulldown(m, iplen + sizeof(*ph),
 952                     sizeof(*bus), &offp)) == NULL) {
 953                         pfsyncstats.pfsyncs_badlen++;
 954                         return;
 955                 }
 956                 bus = (struct pfsync_state_bus *)(mp->m_data + offp);
 957                 switch (bus->status) {
 958                 case PFSYNC_BUS_START:
 959                         lwkt_reltoken(&pf_token);
 960                         callout_reset(&sc->sc_bulkfail_tmo,
 961                             pf_pool_limits[PF_LIMIT_STATES].limit /
 962                             (PFSYNC_BULKPACKETS * sc->sc_maxcount),
 963                             pfsync_bulkfail, LIST_FIRST(&pfsync_list));
 964                         lwkt_gettoken(&pf_token);
 965                         if (pf_status.debug >= PF_DEBUG_MISC)
 966                                 kprintf("pfsync: received bulk "
 967                                     "update start\n");
 968                         break;
 969                 case PFSYNC_BUS_END:
 970                         if (mycpu->gd_time_seconds - ntohl(bus->endtime) >=
 971                             sc->sc_ureq_sent) {
 972                                 /* that's it, we're happy */
 973                                 sc->sc_ureq_sent = 0;
 974                                 sc->sc_bulk_tries = 0;
 975                                 lwkt_reltoken(&pf_token);
 976                                 callout_stop(&sc->sc_bulkfail_tmo);
 977                                 lwkt_gettoken(&pf_token);
 978 #if NCARP > 0
 979                                 if (!pfsync_sync_ok) {
 980                                         lwkt_reltoken(&pf_token);
 981                                         carp_group_demote_adj(&sc->sc_if, -1);
 982                                         lwkt_gettoken(&pf_token);
 983                                 }
 984 #endif
 985                                 pfsync_sync_ok = 1;
 986                                 if (pf_status.debug >= PF_DEBUG_MISC)
 987                                         kprintf("pfsync: received valid "
 988                                             "bulk update end\n");
 989                         } else {
 990                                 if (pf_status.debug >= PF_DEBUG_MISC)
 991                                         kprintf("pfsync: received invalid "
 992                                             "bulk update end: bad timestamp\n");
 993                         }
 994                         break;
 995                 }
 996                 break;
 997         }
 998
 999 done:
1000         if (m)
1001                 m_freem(m);
1002 }
1003
1004 int
1005 pfsyncoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
1006         struct rtentry *rt)
1007 {
1008         m_freem(m);
1009         return (0);
1010 }
1011
1012 /* ARGSUSED */
1013 int
1014 pfsyncioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
1015 {
1016         struct pfsync_softc *sc = ifp->if_softc;
1017         struct ifreq *ifr = (struct ifreq *)data;
1018         struct ip_moptions *imo = &sc->sc_imo;
1019         struct pfsyncreq pfsyncr;
1020         struct ifnet    *sifp;
1021         int error;
1022
1023         lwkt_gettoken(&pf_token);
1024
1025         switch (cmd) {
1026         case SIOCSIFADDR:
1027         case SIOCAIFADDR:
1028         case SIOCSIFDSTADDR:
1029         case SIOCSIFFLAGS:
1030                 if (ifp->if_flags & IFF_UP)
1031                         ifp->if_flags |= IFF_RUNNING;
1032                 else
1033                         ifp->if_flags &= ~IFF_RUNNING;
1034                 break;
1035         case SIOCSIFMTU:
1036                 if (ifr->ifr_mtu < PFSYNC_MINMTU) {
1037                         lwkt_reltoken(&pf_token);
1038                         return (EINVAL);
1039                 }
1040                 if (ifr->ifr_mtu > MCLBYTES)
1041                         ifr->ifr_mtu = MCLBYTES;
1042                 crit_enter();
1043                 if (ifr->ifr_mtu < ifp->if_mtu)
1044                         pfsync_sendout(sc);
1045                 pfsync_setmtu(sc, ifr->ifr_mtu);
1046                 crit_exit();
1047                 break;
1048         case SIOCGETPFSYNC:
1049                 bzero(&pfsyncr, sizeof(pfsyncr));
1050                 if (sc->sc_sync_ifp)
1051                         strlcpy(pfsyncr.pfsyncr_syncdev,
1052                             sc->sc_sync_ifp->if_xname, IFNAMSIZ);
1053                 pfsyncr.pfsyncr_syncpeer = sc->sc_sync_peer;
1054                 pfsyncr.pfsyncr_maxupdates = sc->sc_maxupdates;
1055                 lwkt_reltoken(&pf_token);
1056                 if ((error = copyout(&pfsyncr, ifr->ifr_data, sizeof(pfsyncr))))
1057                         return (error);
1058                 lwkt_gettoken(&pf_token);
1059                 break;
1060         case SIOCSETPFSYNC:
1061                 if ((error = priv_check_cred(cr, PRIV_ROOT, NULL_CRED_OKAY)) != 0) {
1062                         lwkt_reltoken(&pf_token);
1063                         return (error);
1064                 }
1065                 if ((error = copyin(ifr->ifr_data, &pfsyncr, sizeof(pfsyncr)))) {
1066                         lwkt_reltoken(&pf_token);
1067                         return (error);
1068                 }
1069
1070                 if (pfsyncr.pfsyncr_syncpeer.s_addr == 0)
1071                         sc->sc_sync_peer.s_addr = INADDR_PFSYNC_GROUP;
1072                 else
1073                         sc->sc_sync_peer.s_addr =
1074                             pfsyncr.pfsyncr_syncpeer.s_addr;
1075
1076                 if (pfsyncr.pfsyncr_maxupdates > 255) {
1077                         lwkt_reltoken(&pf_token);
1078                         return (EINVAL);
1079                 }
1080                 sc->sc_maxupdates = pfsyncr.pfsyncr_maxupdates;
1081
1082                 if (pfsyncr.pfsyncr_syncdev[0] == 0) {
1083                         sc->sc_sync_ifp = NULL;
1084                         if (sc->sc_mbuf_net != NULL) {
1085                                 /* Don't keep stale pfsync packets around. */
1086                                 crit_enter();
1087                                 m_freem(sc->sc_mbuf_net);
1088                                 sc->sc_mbuf_net = NULL;
1089                                 sc->sc_statep_net.s = NULL;
1090                                 crit_exit();
1091                         }
1092                         if (imo->imo_num_memberships > 0) {
1093                                 pfsync_in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
1094                                 imo->imo_multicast_ifp = NULL;
1095                         }
1096                         break;
1097                 }
1098
1099                 /*
1100                  * XXX not that MPSAFE; pfsync needs serious rework
1101                  */
1102                 ifnet_deserialize_all(ifp);
1103                 ifnet_lock();
1104                 sifp = ifunit(pfsyncr.pfsyncr_syncdev);
1105                 ifnet_unlock();
1106                 ifnet_serialize_all(ifp);
1107
1108                 if (sifp == NULL) {
1109                         lwkt_reltoken(&pf_token);
1110                         return (EINVAL);
1111                 }
1112
1113                 crit_enter();
1114                 if (sifp->if_mtu < sc->sc_if.if_mtu ||
1115                     (sc->sc_sync_ifp != NULL &&
1116                     sifp->if_mtu < sc->sc_sync_ifp->if_mtu) ||
1117                     sifp->if_mtu < MCLBYTES - sizeof(struct ip))
1118                         pfsync_sendout(sc);
1119                 sc->sc_sync_ifp = sifp;
1120
1121                 pfsync_setmtu(sc, sc->sc_if.if_mtu);
1122
1123                 if (imo->imo_num_memberships > 0) {
1124                         pfsync_in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
1125                         imo->imo_multicast_ifp = NULL;
1126                 }
1127
1128                 if (sc->sc_sync_ifp &&
1129                     sc->sc_sync_peer.s_addr == INADDR_PFSYNC_GROUP) {
1130                         if (!(sc->sc_sync_ifp->if_flags & IFF_MULTICAST)) {
1131                                 sc->sc_sync_ifp = NULL;
1132                                 lwkt_reltoken(&pf_token);
1133                                 crit_exit();
1134                                 return (EADDRNOTAVAIL);
1135                         }
1136
1137                         if ((imo->imo_membership[0] =
1138                             pfsync_in_addmulti(sc->sc_sync_ifp)) == NULL) {
1139                                 sc->sc_sync_ifp = NULL;
1140                                 lwkt_reltoken(&pf_token);
1141                                 crit_exit();
1142                                 return (ENOBUFS);
1143                         }
1144                         imo->imo_num_memberships++;
1145                         imo->imo_multicast_ifp = sc->sc_sync_ifp;
1146                         imo->imo_multicast_ttl = PFSYNC_DFLTTL;
1147                         imo->imo_multicast_loop = 0;
1148                 }
1149
1150                 if (sc->sc_sync_ifp ||
1151                     sc->sc_sendaddr.s_addr != INADDR_PFSYNC_GROUP) {
1152                         /* Request a full state table update. */
1153                         sc->sc_ureq_sent = mycpu->gd_time_seconds;
1154 #if NCARP > 0
1155                         if (pfsync_sync_ok)
1156                                 carp_group_demote_adj(&sc->sc_if, 1);
1157 #endif
1158                         pfsync_sync_ok = 0;
1159                         if (pf_status.debug >= PF_DEBUG_MISC)
1160                                 kprintf("pfsync: requesting bulk update\n");
1161                         lwkt_reltoken(&pf_token);
1162                         callout_reset(&sc->sc_bulkfail_tmo, 5 * hz,
1163                             pfsync_bulkfail, LIST_FIRST(&pfsync_list));
1164                         lwkt_gettoken(&pf_token);
1165                         error = pfsync_request_update(NULL, NULL);
1166                         if (error == ENOMEM) {
1167                                 lwkt_reltoken(&pf_token);
1168                                 crit_exit();
1169                                 return (ENOMEM);
1170                         }
1171                         pfsync_sendout(sc);
1172                 }
1173                 crit_exit();
1174
1175                 break;
1176
1177         default:
1178                 lwkt_reltoken(&pf_token);
1179                 return (ENOTTY);
1180         }
1181
1182         lwkt_reltoken(&pf_token);
1183         return (0);
1184 }
1185
1186 void
1187 pfsync_setmtu(struct pfsync_softc *sc, int mtu_req)
1188 {
1189         int mtu;
1190
1191         if (sc->sc_sync_ifp && sc->sc_sync_ifp->if_mtu < mtu_req)
1192                 mtu = sc->sc_sync_ifp->if_mtu;
1193         else
1194                 mtu = mtu_req;
1195
1196         sc->sc_maxcount = (mtu - sizeof(struct pfsync_header)) /
1197             sizeof(struct pfsync_state);
1198         if (sc->sc_maxcount > 254)
1199             sc->sc_maxcount = 254;
1200         sc->sc_if.if_mtu = sizeof(struct pfsync_header) +
1201             sc->sc_maxcount * sizeof(struct pfsync_state);
1202 }
1203
1204 struct mbuf *
1205 pfsync_get_mbuf(struct pfsync_softc *sc, u_int8_t action, void **sp)
1206 {
1207         struct pfsync_header *h;
1208         struct mbuf *m;
1209         int len;
1210
1211         ASSERT_LWKT_TOKEN_HELD(&pf_token);
1212
1213         MGETHDR(m, M_WAITOK, MT_DATA);
1214         if (m == NULL) {
1215                 IFNET_STAT_INC(&sc->sc_if, oerrors, 1);
1216                 return (NULL);
1217         }
1218
1219         switch (action) {
1220         case PFSYNC_ACT_CLR:
1221                 len = sizeof(struct pfsync_header) +
1222                     sizeof(struct pfsync_state_clr);
1223                 break;
1224         case PFSYNC_ACT_UPD_C:
1225                 len = (sc->sc_maxcount * sizeof(struct pfsync_state_upd)) +
1226                     sizeof(struct pfsync_header);
1227                 break;
1228         case PFSYNC_ACT_DEL_C:
1229                 len = (sc->sc_maxcount * sizeof(struct pfsync_state_del)) +
1230                     sizeof(struct pfsync_header);
1231                 break;
1232         case PFSYNC_ACT_UREQ:
1233                 len = (sc->sc_maxcount * sizeof(struct pfsync_state_upd_req)) +
1234                     sizeof(struct pfsync_header);
1235                 break;
1236         case PFSYNC_ACT_BUS:
1237                 len = sizeof(struct pfsync_header) +
1238                     sizeof(struct pfsync_state_bus);
1239                 break;
1240         case PFSYNC_ACT_TDB_UPD:
1241                 len = (sc->sc_maxcount * sizeof(struct pfsync_tdb)) +
1242                     sizeof(struct pfsync_header);
1243                 break;
1244         default:
1245                 len = (sc->sc_maxcount * sizeof(struct pfsync_state)) +
1246                     sizeof(struct pfsync_header);
1247                 break;
1248         }
1249
1250         if (len > MHLEN) {
1251                 MCLGET(m, M_WAITOK);
1252                 if ((m->m_flags & M_EXT) == 0) {
1253                         m_free(m);
1254                         IFNET_STAT_INC(&sc->sc_if, oerrors, 1);
1255                         return (NULL);
1256                 }
1257                 m->m_data += (MCLBYTES - len) &~ (sizeof(long) - 1);
1258         } else
1259                 MH_ALIGN(m, len);
1260
1261         m->m_pkthdr.rcvif = NULL;
1262         m->m_pkthdr.len = m->m_len = sizeof(struct pfsync_header);
1263         h = mtod(m, struct pfsync_header *);
1264         h->version = PFSYNC_VERSION;
1265         h->af = 0;
1266         h->count = 0;
1267         h->action = action;
1268
1269         *sp = (void *)((char *)h + PFSYNC_HDRLEN);
1270         lwkt_reltoken(&pf_token);
1271         callout_reset(&sc->sc_tmo, hz, pfsync_timeout,
1272             LIST_FIRST(&pfsync_list));
1273         lwkt_gettoken(&pf_token);
1274         return (m);
1275 }
1276
1277 int
1278 pfsync_pack_state(u_int8_t action, struct pf_state *st, int flags)
1279 {
1280         struct ifnet *ifp = NULL;
1281         struct pfsync_softc *sc = pfsyncif;
1282         struct pfsync_header *h, *h_net;
1283         struct pfsync_state *sp = NULL;
1284         struct pfsync_state_upd *up = NULL;
1285         struct pfsync_state_del *dp = NULL;
1286         int ret = 0;
1287         u_int8_t i = 255, newaction = 0;
1288
1289         if (sc == NULL)
1290                 return (0);
1291         ifp = &sc->sc_if;
1292
1293         /*
1294          * If a packet falls in the forest and there's nobody around to
1295          * hear, does it make a sound?
1296          */
1297         if (ifp->if_bpf == NULL && sc->sc_sync_ifp == NULL &&
1298             sc->sc_sync_peer.s_addr == INADDR_PFSYNC_GROUP) {
1299                 /* Don't leave any stale pfsync packets hanging around. */
1300                 if (sc->sc_mbuf != NULL) {
1301                         m_freem(sc->sc_mbuf);
1302                         sc->sc_mbuf = NULL;
1303                         sc->sc_statep.s = NULL;
1304                 }
1305                 return (0);
1306         }
1307
1308         if (action >= PFSYNC_ACT_MAX)
1309                 return (EINVAL);
1310
1311         crit_enter();
1312         if (sc->sc_mbuf == NULL) {
1313                 if ((sc->sc_mbuf = pfsync_get_mbuf(sc, action,
1314                     (void *)&sc->sc_statep.s)) == NULL) {
1315                         crit_exit();
1316                         return (ENOMEM);
1317                 }
1318                 h = mtod(sc->sc_mbuf, struct pfsync_header *);
1319         } else {
1320                 h = mtod(sc->sc_mbuf, struct pfsync_header *);
1321                 if (h->action != action) {
1322                         pfsync_sendout(sc);
1323                         if ((sc->sc_mbuf = pfsync_get_mbuf(sc, action,
1324                             (void *)&sc->sc_statep.s)) == NULL) {
1325                                 crit_exit();
1326                                 return (ENOMEM);
1327                         }
1328                         h = mtod(sc->sc_mbuf, struct pfsync_header *);
1329                 } else {
1330                         /*
1331                          * If it's an update, look in the packet to see if
1332                          * we already have an update for the state.
1333                          */
1334                         if (action == PFSYNC_ACT_UPD && sc->sc_maxupdates) {
1335                                 struct pfsync_state *usp =
1336                                     (void *)((char *)h + PFSYNC_HDRLEN);
1337
1338                                 for (i = 0; i < h->count; i++) {
1339                                         if (!memcmp(usp->id, &st->id,
1340                                             PFSYNC_ID_LEN) &&
1341                                             usp->creatorid == st->creatorid) {
1342                                                 sp = usp;
1343                                                 sp->updates++;
1344                                                 break;
1345                                         }
1346                                         usp++;
1347                                 }
1348                         }
1349                 }
1350         }
1351
1352         st->pfsync_time = mycpu->gd_time_seconds;
1353
1354         if (sp == NULL) {
1355                 /* not a "duplicate" update */
1356                 i = 255;
1357                 sp = sc->sc_statep.s++;
1358                 sc->sc_mbuf->m_pkthdr.len =
1359                     sc->sc_mbuf->m_len += sizeof(struct pfsync_state);
1360                 h->count++;
1361                 bzero(sp, sizeof(*sp));
1362
1363                 pfsync_state_export(sp, st);
1364
1365                 if (flags & PFSYNC_FLAG_STALE)
1366                         sp->sync_flags |= PFSTATE_STALE;
1367         } else {
1368                 pf_state_peer_hton(&st->src, &sp->src);
1369                 pf_state_peer_hton(&st->dst, &sp->dst);
1370
1371                 if (st->expire <= time_second)
1372                         sp->expire = htonl(0);
1373                 else
1374                         sp->expire = htonl(st->expire - time_second);
1375         }
1376
1377         /* do we need to build "compressed" actions for network transfer? */
1378         if (sc->sc_sync_ifp && flags & PFSYNC_FLAG_COMPRESS) {
1379                 switch (action) {
1380                 case PFSYNC_ACT_UPD:
1381                         newaction = PFSYNC_ACT_UPD_C;
1382                         break;
1383                 case PFSYNC_ACT_DEL:
1384                         newaction = PFSYNC_ACT_DEL_C;
1385                         break;
1386                 default:
1387                         /* by default we just send the uncompressed states */
1388                         break;
1389                 }
1390         }
1391
1392         if (newaction) {
1393                 if (sc->sc_mbuf_net == NULL) {
1394                         if ((sc->sc_mbuf_net = pfsync_get_mbuf(sc, newaction,
1395                             (void *)&sc->sc_statep_net.s)) == NULL) {
1396                                 crit_exit();
1397                                 return (ENOMEM);
1398                         }
1399                 }
1400                 h_net = mtod(sc->sc_mbuf_net, struct pfsync_header *);
1401
1402                 switch (newaction) {
1403                 case PFSYNC_ACT_UPD_C:
1404                         if (i != 255) {
1405                                 up = (void *)((char *)h_net +
1406                                     PFSYNC_HDRLEN + (i * sizeof(*up)));
1407                                 up->updates++;
1408                         } else {
1409                                 h_net->count++;
1410                                 sc->sc_mbuf_net->m_pkthdr.len =
1411                                     sc->sc_mbuf_net->m_len += sizeof(*up);
1412                                 up = sc->sc_statep_net.u++;
1413
1414                                 bzero(up, sizeof(*up));
1415                                 bcopy(&st->id, up->id, sizeof(up->id));
1416                                 up->creatorid = st->creatorid;
1417                         }
1418                         up->timeout = st->timeout;
1419                         up->expire = sp->expire;
1420                         up->src = sp->src;
1421                         up->dst = sp->dst;
1422                         break;
1423                 case PFSYNC_ACT_DEL_C:
1424                         sc->sc_mbuf_net->m_pkthdr.len =
1425                             sc->sc_mbuf_net->m_len += sizeof(*dp);
1426                         dp = sc->sc_statep_net.d++;
1427                         h_net->count++;
1428
1429                         bzero(dp, sizeof(*dp));
1430                         bcopy(&st->id, dp->id, sizeof(dp->id));
1431                         dp->creatorid = st->creatorid;
1432                         break;
1433                 }
1434         }
1435
1436         if (h->count == sc->sc_maxcount ||
1437             (sc->sc_maxupdates && (sp->updates >= sc->sc_maxupdates)))
1438                 ret = pfsync_sendout(sc);
1439
1440         crit_exit();
1441         return (ret);
1442 }
1443
1444 int
1445 pfsync_request_update(struct pfsync_state_upd *up, struct in_addr *src)
1446 {
1447         struct pfsync_header *h;
1448         struct pfsync_softc *sc = pfsyncif;
1449         struct pfsync_state_upd_req *rup;
1450         int ret = 0;
1451
1452         if (sc == NULL)
1453                 return (0);
1454
1455         if (sc->sc_mbuf == NULL) {
1456                 if ((sc->sc_mbuf = pfsync_get_mbuf(sc, PFSYNC_ACT_UREQ,
1457                     (void *)&sc->sc_statep.s)) == NULL)
1458                         return (ENOMEM);
1459                 h = mtod(sc->sc_mbuf, struct pfsync_header *);
1460         } else {
1461                 h = mtod(sc->sc_mbuf, struct pfsync_header *);
1462                 if (h->action != PFSYNC_ACT_UREQ) {
1463                         pfsync_sendout(sc);
1464                         if ((sc->sc_mbuf = pfsync_get_mbuf(sc, PFSYNC_ACT_UREQ,
1465                             (void *)&sc->sc_statep.s)) == NULL)
1466                                 return (ENOMEM);
1467                         h = mtod(sc->sc_mbuf, struct pfsync_header *);
1468                 }
1469         }
1470
1471         if (src != NULL)
1472                 sc->sc_sendaddr = *src;
1473         sc->sc_mbuf->m_pkthdr.len = sc->sc_mbuf->m_len += sizeof(*rup);
1474         h->count++;
1475         rup = sc->sc_statep.r++;
1476         bzero(rup, sizeof(*rup));
1477         if (up != NULL) {
1478                 bcopy(up->id, rup->id, sizeof(rup->id));
1479                 rup->creatorid = up->creatorid;
1480         }
1481
1482         if (h->count == sc->sc_maxcount)
1483                 ret = pfsync_sendout(sc);
1484
1485         return (ret);
1486 }
1487
1488 int
1489 pfsync_clear_states(u_int32_t creatorid, char *ifname)
1490 {
1491         struct pfsync_softc *sc = pfsyncif;
1492         struct pfsync_state_clr *cp;
1493         int ret;
1494
1495         if (sc == NULL)
1496                 return (0);
1497
1498         crit_enter();
1499         if (sc->sc_mbuf != NULL)
1500                 pfsync_sendout(sc);
1501         if ((sc->sc_mbuf = pfsync_get_mbuf(sc, PFSYNC_ACT_CLR,
1502             (void *)&sc->sc_statep.c)) == NULL) {
1503                 crit_exit();
1504                 return (ENOMEM);
1505         }
1506         sc->sc_mbuf->m_pkthdr.len = sc->sc_mbuf->m_len += sizeof(*cp);
1507         cp = sc->sc_statep.c;
1508         cp->creatorid = creatorid;
1509         if (ifname != NULL)
1510                 strlcpy(cp->ifname, ifname, IFNAMSIZ);
1511
1512         ret = (pfsync_sendout(sc));
1513         crit_exit();
1514         return (ret);
1515 }
1516
1517 void
1518 pfsync_timeout(void *v)
1519 {
1520         struct pfsync_softc *sc = v;
1521
1522         crit_enter();
1523         pfsync_sendout(sc);
1524         crit_exit();
1525 }
1526
1527 void
1528 pfsync_send_bus(struct pfsync_softc *sc, u_int8_t status)
1529 {
1530         struct pfsync_state_bus *bus;
1531
1532         if (sc->sc_mbuf != NULL)
1533                 pfsync_sendout(sc);
1534
1535         if (pfsync_sync_ok &&
1536             (sc->sc_mbuf = pfsync_get_mbuf(sc, PFSYNC_ACT_BUS,
1537             (void *)&sc->sc_statep.b)) != NULL) {
1538                 sc->sc_mbuf->m_pkthdr.len = sc->sc_mbuf->m_len += sizeof(*bus);
1539                 bus = sc->sc_statep.b;
1540                 bus->creatorid = pf_status.hostid;
1541                 bus->status = status;
1542                 bus->endtime = htonl(mycpu->gd_time_seconds - sc->sc_ureq_received);
1543                 pfsync_sendout(sc);
1544         }
1545 }
1546
1547 void
1548 pfsync_bulk_update(void *v)
1549 {
1550         struct pfsync_softc *sc = v;
1551         int i = 0;
1552         int cpu;
1553         struct pf_state *state;
1554
1555         ASSERT_LWKT_TOKEN_HELD(&pf_token);
1556
1557         crit_enter();
1558         if (sc->sc_mbuf != NULL)
1559                 pfsync_sendout(sc);
1560
1561         /*
1562          * Grab at most PFSYNC_BULKPACKETS worth of states which have not
1563          * been sent since the latest request was made.
1564          */
1565         state = sc->sc_bulk_send_next;
1566         cpu = sc->sc_bulk_send_cpu;
1567         if (state)
1568                 do {
1569                         /* send state update if syncable and not already sent */
1570                         if (!state->sync_flags
1571                             && state->timeout < PFTM_MAX
1572                             && state->pfsync_time <= sc->sc_ureq_received) {
1573                                 pfsync_pack_state(PFSYNC_ACT_UPD, state, 0);
1574                                 i++;
1575                         }
1576
1577                         /* figure next state to send */
1578                         state = TAILQ_NEXT(state, entry_list);
1579
1580                         /* wrap to start of list if we hit the end */
1581                         if (state == NULL) {
1582                                 if (++cpu >= ncpus)
1583                                         cpu = 0;
1584                                 state = TAILQ_FIRST(&state_list[cpu]);
1585                         }
1586                 } while (i < sc->sc_maxcount * PFSYNC_BULKPACKETS &&
1587                     cpu != sc->sc_bulk_terminator_cpu &&
1588                     state != sc->sc_bulk_terminator);
1589
1590         if (state == NULL || (cpu == sc->sc_bulk_terminator_cpu &&
1591                               state == sc->sc_bulk_terminator)) {
1592                 /* we're done */
1593                 pfsync_send_bus(sc, PFSYNC_BUS_END);
1594                 sc->sc_ureq_received = 0;
1595                 sc->sc_bulk_send_next = NULL;
1596                 sc->sc_bulk_terminator = NULL;
1597                 sc->sc_bulk_send_cpu = 0;
1598                 sc->sc_bulk_terminator_cpu = 0;
1599                 lwkt_reltoken(&pf_token);
1600                 callout_stop(&sc->sc_bulk_tmo);
1601                 lwkt_gettoken(&pf_token);
1602                 if (pf_status.debug >= PF_DEBUG_MISC)
1603                         kprintf("pfsync: bulk update complete\n");
1604         } else {
1605                 /* look again for more in a bit */
1606                 lwkt_reltoken(&pf_token);
1607                 callout_reset(&sc->sc_bulk_tmo, 1, pfsync_timeout,
1608                             LIST_FIRST(&pfsync_list));
1609                 lwkt_gettoken(&pf_token);
1610                 sc->sc_bulk_send_next = state;
1611                 sc->sc_bulk_send_cpu = cpu;
1612         }
1613         if (sc->sc_mbuf != NULL)
1614                 pfsync_sendout(sc);
1615         crit_exit();
1616 }
1617
1618 void
1619 pfsync_bulkfail(void *v)
1620 {
1621         struct pfsync_softc *sc = v;
1622         int error;
1623
1624         ASSERT_LWKT_TOKEN_HELD(&pf_token);
1625
1626         if (sc->sc_bulk_tries++ < PFSYNC_MAX_BULKTRIES) {
1627                 /* Try again in a bit */
1628                 lwkt_reltoken(&pf_token);
1629                 callout_reset(&sc->sc_bulkfail_tmo, 5 * hz, pfsync_bulkfail,
1630                     LIST_FIRST(&pfsync_list));
1631                 lwkt_gettoken(&pf_token);
1632                 crit_enter();
1633                 error = pfsync_request_update(NULL, NULL);
1634                 if (error == ENOMEM) {
1635                         if (pf_status.debug >= PF_DEBUG_MISC)
1636                                 kprintf("pfsync: cannot allocate mbufs for "
1637                                     "bulk update\n");
1638                 } else
1639                         pfsync_sendout(sc);
1640                 crit_exit();
1641         } else {
1642                 /* Pretend like the transfer was ok */
1643                 sc->sc_ureq_sent = 0;
1644                 sc->sc_bulk_tries = 0;
1645 #if NCARP > 0
1646                 if (!pfsync_sync_ok)
1647                         carp_group_demote_adj(&sc->sc_if, -1);
1648 #endif
1649                 pfsync_sync_ok = 1;
1650                 if (pf_status.debug >= PF_DEBUG_MISC)
1651                         kprintf("pfsync: failed to receive "
1652                             "bulk update status\n");
1653                 lwkt_reltoken(&pf_token);
1654                 callout_stop(&sc->sc_bulkfail_tmo);
1655                 lwkt_gettoken(&pf_token);
1656         }
1657 }
1658
1659 static void
1660 pfsync_sendout_handler(netmsg_t nmsg)
1661 {
1662         struct netmsg_genpkt *msg = (struct netmsg_genpkt *)nmsg;
1663
1664         pfsync_sendout_mbuf(msg->arg1, msg->m);
1665 }
1666
1667 int
1668 pfsync_sendout(struct pfsync_softc *sc)
1669 {
1670 #if NBPFILTER > 0
1671         struct ifnet *ifp = &sc->sc_if;
1672 #endif
1673         struct mbuf *m;
1674         struct netmsg_genpkt *msg;
1675
1676         ASSERT_LWKT_TOKEN_HELD(&pf_token);
1677
1678         lwkt_reltoken(&pf_token);
1679         callout_stop(&sc->sc_tmo);
1680         lwkt_gettoken(&pf_token);
1681
1682         if (sc->sc_mbuf == NULL)
1683                 return (0);
1684         m = sc->sc_mbuf;
1685         sc->sc_mbuf = NULL;
1686         sc->sc_statep.s = NULL;
1687
1688 #if NBPFILTER > 0
1689         if (ifp->if_bpf) {
1690                 bpf_gettoken();
1691                 if (ifp->if_bpf)
1692                         bpf_mtap(ifp->if_bpf, m, BPF_DIRECTION_OUT);
1693                 bpf_reltoken();
1694         }
1695 #endif
1696
1697         if (sc->sc_mbuf_net) {
1698                 m_freem(m);
1699                 m = sc->sc_mbuf_net;
1700                 sc->sc_mbuf_net = NULL;
1701                 sc->sc_statep_net.s = NULL;
1702         }
1703
1704         msg = &m->m_hdr.mh_genmsg;
1705         netmsg_init(&msg->base, NULL, &netisr_apanic_rport, 0,
1706             pfsync_sendout_handler);
1707         msg->m = m;
1708         msg->arg1 = sc;
1709         netisr_sendmsg(&msg->base, 0);
1710
1711         return (0);
1712 }
1713
1714 int
1715 pfsync_sendout_mbuf(struct pfsync_softc *sc, struct mbuf *m)
1716 {
1717         struct sockaddr sa;
1718         struct ip *ip;
1719
1720         if (sc->sc_sync_ifp ||
1721             sc->sc_sync_peer.s_addr != INADDR_PFSYNC_GROUP) {
1722                 M_PREPEND(m, sizeof(struct ip), M_WAITOK);
1723                 if (m == NULL) {
1724                         pfsyncstats.pfsyncs_onomem++;
1725                         return (0);
1726                 }
1727                 ip = mtod(m, struct ip *);
1728                 ip->ip_v = IPVERSION;
1729                 ip->ip_hl = sizeof(*ip) >> 2;
1730                 ip->ip_tos = IPTOS_LOWDELAY;
1731                 ip->ip_len = htons(m->m_pkthdr.len);
1732                 ip->ip_id = htons(ip_randomid());
1733                 ip->ip_off = htons(IP_DF);
1734                 ip->ip_ttl = PFSYNC_DFLTTL;
1735                 ip->ip_p = IPPROTO_PFSYNC;
1736                 ip->ip_sum = 0;
1737
1738                 bzero(&sa, sizeof(sa));
1739                 ip->ip_src.s_addr = INADDR_ANY;
1740
1741                 if (sc->sc_sendaddr.s_addr == INADDR_PFSYNC_GROUP)
1742                         m->m_flags |= M_MCAST;
1743                 ip->ip_dst = sc->sc_sendaddr;
1744                 sc->sc_sendaddr.s_addr = sc->sc_sync_peer.s_addr;
1745
1746                 pfsyncstats.pfsyncs_opackets++;
1747
1748                 if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL))
1749                         pfsyncstats.pfsyncs_oerrors++;
1750         } else
1751                 m_freem(m);
1752
1753         return (0);
1754 }
1755
1756 static int
1757 pfsync_modevent(module_t mod, int type, void *data)
1758 {
1759         int error = 0;
1760
1761         struct pfsync_softc     *pfs_if, *tmp;
1762
1763         lwkt_gettoken(&pf_token);
1764
1765         switch (type) {
1766         case MOD_LOAD:
1767                 LIST_INIT(&pfsync_list);
1768                 lwkt_reltoken(&pf_token);
1769                 if_clone_attach(&pfsync_cloner);
1770                 lwkt_gettoken(&pf_token);
1771                 /* Override the function pointer for pf_ioctl.c */
1772                 break;
1773
1774         case MOD_UNLOAD:
1775                 lwkt_reltoken(&pf_token);
1776                 if_clone_detach(&pfsync_cloner);
1777                 lwkt_gettoken(&pf_token);
1778                 LIST_FOREACH_MUTABLE(pfs_if, &pfsync_list, sc_next, tmp) {
1779                         pfsync_clone_destroy(&pfs_if->sc_if);
1780                 }
1781                 break;
1782
1783         default:
1784                 error = EINVAL;
1785                 break;
1786         }
1787
1788         lwkt_reltoken(&pf_token);
1789         return error;
1790 }
1791
1792 static moduledata_t pfsync_mod = {
1793         "pfsync",
1794         pfsync_modevent,
1795         0
1796 };
1797
1798 #define PFSYNC_MODVER 44
1799
1800 DECLARE_MODULE(pfsync, pfsync_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
1801 MODULE_VERSION(pfsync, PFSYNC_MODVER);
1802
1803 static void
1804 pfsync_in_addmulti_dispatch(netmsg_t nmsg)
1805 {
1806         struct lwkt_msg *lmsg = &nmsg->lmsg;
1807         struct ifnet *ifp = lmsg->u.ms_resultp;
1808         struct in_addr addr;
1809
1810         addr.s_addr = INADDR_PFSYNC_GROUP;
1811         lmsg->u.ms_resultp = in_addmulti(&addr, ifp);
1812
1813         lwkt_replymsg(lmsg, 0);
1814 }
1815
1816 static struct in_multi *
1817 pfsync_in_addmulti(struct ifnet *ifp)
1818 {
1819         struct netmsg_base nmsg;
1820         struct lwkt_msg *lmsg = &nmsg.lmsg;
1821
1822         netmsg_init(&nmsg, NULL, &curthread->td_msgport, 0,
1823             pfsync_in_addmulti_dispatch);
1824         lmsg->u.ms_resultp = ifp;
1825
1826         lwkt_domsg(netisr_cpuport(0), lmsg, 0);
1827         return lmsg->u.ms_resultp;
1828 }
1829
1830 static void
1831 pfsync_in_delmulti_dispatch(netmsg_t nmsg)
1832 {
1833         struct lwkt_msg *lmsg = &nmsg->lmsg;
1834
1835         in_delmulti(lmsg->u.ms_resultp);
1836         lwkt_replymsg(lmsg, 0);
1837 }
1838
1839 static void
1840 pfsync_in_delmulti(struct in_multi *inm)
1841 {
1842         struct netmsg_base nmsg;
1843         struct lwkt_msg *lmsg = &nmsg.lmsg;
1844
1845         netmsg_init(&nmsg, NULL, &curthread->td_msgport, 0,
1846             pfsync_in_delmulti_dispatch);
1847         lmsg->u.ms_resultp = inm;
1848
1849         lwkt_domsg(netisr_cpuport(0), lmsg, 0);
1850 }