/* $OpenBSD: if_pfsync.c,v 1.133 2009/11/23 16:03:10 henning Exp $ */ /* * Copyright (c) 2002 Michael Shalayeff * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT, * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF * THE POSSIBILITY OF SUCH DAMAGE. */ /* * Copyright (c) 2009 David Gwynne * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef INET #include #include #include #include #endif #ifdef INET6 #include #endif /* INET6 */ #include "carp.h" #if NCARP > 0 #include #endif #include #include #include "bpfilter.h" #include "pfsync.h" #define PFSYNC_MINPKT ( \ sizeof(struct ip) + \ sizeof(struct pfsync_header) + \ sizeof(struct pfsync_subheader)) struct pfsync_pkt { struct ip *ip; struct in_addr src; u_int8_t flags; }; int pfsync_upd_tcp(struct pf_state *, struct pfsync_state_peer *, struct pfsync_state_peer *); int pfsync_in_clr(struct pfsync_pkt *, struct mbuf *, int, int); int pfsync_in_iack(struct pfsync_pkt *, struct mbuf *, int, int); int pfsync_in_upd_c(struct pfsync_pkt *, struct mbuf *, int, int); int pfsync_in_ureq(struct pfsync_pkt *, struct mbuf *, int, int); int pfsync_in_del(struct pfsync_pkt *, struct mbuf *, int, int); int pfsync_in_del_c(struct pfsync_pkt *, struct mbuf *, int, int); int pfsync_in_bus(struct pfsync_pkt *, struct mbuf *, int, int); int pfsync_in_tdb(struct pfsync_pkt *, struct mbuf *, int, int); int pfsync_in_ins(struct pfsync_pkt *, struct mbuf *, int, int); int pfsync_in_upd(struct pfsync_pkt *, struct mbuf *, int, int); int pfsync_in_eof(struct pfsync_pkt *, struct mbuf *, int, int); int pfsync_in_error(struct pfsync_pkt *, struct mbuf *, int, int); int (*pfsync_acts[])(struct pfsync_pkt *, struct mbuf *, int, int) = { pfsync_in_clr, /* PFSYNC_ACT_CLR */ pfsync_in_error, /* PFSYNC_ACT_OINS */ pfsync_in_iack, /* PFSYNC_ACT_INS_ACK */ pfsync_in_error, /* PFSYNC_ACT_OUPD */ pfsync_in_upd_c, /* PFSYNC_ACT_UPD_C */ pfsync_in_ureq, /* PFSYNC_ACT_UPD_REQ */ pfsync_in_del, /* PFSYNC_ACT_DEL */ pfsync_in_del_c, /* PFSYNC_ACT_DEL_C */ pfsync_in_error, /* PFSYNC_ACT_INS_F */ pfsync_in_error, /* PFSYNC_ACT_DEL_F */ pfsync_in_bus, /* PFSYNC_ACT_BUS */ pfsync_in_tdb, /* PFSYNC_ACT_TDB */ pfsync_in_eof, /* PFSYNC_ACT_EOF */ pfsync_in_ins, /* PFSYNC_ACT_INS */ pfsync_in_upd /* PFSYNC_ACT_UPD */ }; struct pfsync_q { void (*write)(struct pf_state *, void *); size_t len; u_int8_t action; }; /* we have one of these for every PFSYNC_S_ */ void pfsync_out_state(struct pf_state *, void *); void pfsync_out_iack(struct pf_state *, void *); void pfsync_out_upd_c(struct pf_state *, void *); void pfsync_out_del(struct pf_state *, void *); struct pfsync_q pfsync_qs[] = { { pfsync_out_iack, sizeof(struct pfsync_ins_ack), PFSYNC_ACT_INS_ACK }, { pfsync_out_upd_c, sizeof(struct pfsync_upd_c), PFSYNC_ACT_UPD_C }, { pfsync_out_del, sizeof(struct pfsync_del_c), PFSYNC_ACT_DEL_C }, { pfsync_out_state, sizeof(struct pfsync_state), PFSYNC_ACT_INS }, { pfsync_out_state, sizeof(struct pfsync_state), PFSYNC_ACT_UPD } }; void pfsync_q_ins(struct pf_state *, int); void pfsync_q_del(struct pf_state *); struct pfsync_upd_req_item { TAILQ_ENTRY(pfsync_upd_req_item) ur_entry; struct pfsync_upd_req ur_msg; }; TAILQ_HEAD(pfsync_upd_reqs, pfsync_upd_req_item); struct pfsync_deferral { TAILQ_ENTRY(pfsync_deferral) pd_entry; struct pf_state *pd_st; struct mbuf *pd_m; struct timeout pd_tmo; }; TAILQ_HEAD(pfsync_deferrals, pfsync_deferral); #define PFSYNC_PLSIZE MAX(sizeof(struct pfsync_upd_req_item), \ sizeof(struct pfsync_deferral)) void pfsync_out_tdb(struct tdb *, void *); struct pfsync_softc { struct ifnet sc_if; struct ifnet *sc_sync_if; struct pool sc_pool; struct ip_moptions sc_imo; struct in_addr sc_sync_peer; u_int8_t sc_maxupdates; struct ip sc_template; struct pf_state_queue sc_qs[PFSYNC_S_COUNT]; size_t sc_len; struct pfsync_upd_reqs sc_upd_req_list; int sc_defer; struct pfsync_deferrals sc_deferrals; u_int sc_deferred; void *sc_plus; size_t sc_pluslen; u_int32_t sc_ureq_sent; int sc_bulk_tries; struct timeout sc_bulkfail_tmo; u_int32_t sc_ureq_received; struct pf_state *sc_bulk_next; struct pf_state *sc_bulk_last; struct timeout sc_bulk_tmo; TAILQ_HEAD(, tdb) sc_tdb_q; struct timeout sc_tmo; }; struct pfsync_softc *pfsyncif = NULL; struct pfsyncstats pfsyncstats; void pfsyncattach(int); int pfsync_clone_create(struct if_clone *, int); int pfsync_clone_destroy(struct ifnet *); int pfsync_alloc_scrub_memory(struct pfsync_state_peer *, struct pf_state_peer *); void pfsync_update_net_tdb(struct pfsync_tdb *); int pfsyncoutput(struct ifnet *, struct mbuf *, struct sockaddr *, struct rtentry *); int pfsyncioctl(struct ifnet *, u_long, caddr_t); void pfsyncstart(struct ifnet *); struct mbuf *pfsync_if_dequeue(struct ifnet *); void pfsync_deferred(struct pf_state *, int); void pfsync_undefer(struct pfsync_deferral *, int); void pfsync_defer_tmo(void *); void pfsync_request_update(u_int32_t, u_int64_t); void pfsync_update_state_req(struct pf_state *); void pfsync_drop(struct pfsync_softc *); void pfsync_sendout(void); void pfsync_send_plus(void *, size_t); void pfsync_timeout(void *); void pfsync_tdb_timeout(void *); void pfsync_bulk_start(void); void pfsync_bulk_status(u_int8_t); void pfsync_bulk_update(void *); void pfsync_bulk_fail(void *); #define PFSYNC_MAX_BULKTRIES 12 int pfsync_sync_ok; struct if_clone pfsync_cloner = IF_CLONE_INITIALIZER("pfsync", pfsync_clone_create, pfsync_clone_destroy); void pfsyncattach(int npfsync) { if_clone_attach(&pfsync_cloner); } int pfsync_clone_create(struct if_clone *ifc, int unit) { struct pfsync_softc *sc; struct ifnet *ifp; int q; if (unit != 0) return (EINVAL); pfsync_sync_ok = 1; sc = malloc(sizeof(*pfsyncif), M_DEVBUF, M_NOWAIT | M_ZERO); if (sc == NULL) return (ENOMEM); for (q = 0; q < PFSYNC_S_COUNT; q++) TAILQ_INIT(&sc->sc_qs[q]); pool_init(&sc->sc_pool, PFSYNC_PLSIZE, 0, 0, 0, "pfsync", NULL); TAILQ_INIT(&sc->sc_upd_req_list); TAILQ_INIT(&sc->sc_deferrals); sc->sc_deferred = 0; TAILQ_INIT(&sc->sc_tdb_q); sc->sc_len = PFSYNC_MINPKT; sc->sc_maxupdates = 128; sc->sc_imo.imo_membership = (struct in_multi **)malloc( (sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_IPMOPTS, M_WAITOK | M_ZERO); sc->sc_imo.imo_max_memberships = IP_MIN_MEMBERSHIPS; ifp = &sc->sc_if; snprintf(ifp->if_xname, sizeof ifp->if_xname, "pfsync%d", unit); ifp->if_softc = sc; ifp->if_ioctl = pfsyncioctl; ifp->if_output = pfsyncoutput; ifp->if_start = pfsyncstart; ifp->if_type = IFT_PFSYNC; ifp->if_snd.ifq_maxlen = ifqmaxlen; ifp->if_hdrlen = sizeof(struct pfsync_header); ifp->if_mtu = 1500; /* XXX */ ifp->if_hardmtu = MCLBYTES; /* XXX */ timeout_set(&sc->sc_tmo, pfsync_timeout, sc); timeout_set(&sc->sc_bulk_tmo, pfsync_bulk_update, sc); timeout_set(&sc->sc_bulkfail_tmo, pfsync_bulk_fail, sc); if_attach(ifp); if_alloc_sadl(ifp); #if NCARP > 0 if_addgroup(ifp, "carp"); #endif #if NBPFILTER > 0 bpfattach(&sc->sc_if.if_bpf, ifp, DLT_PFSYNC, PFSYNC_HDRLEN); #endif pfsyncif = sc; return (0); } int pfsync_clone_destroy(struct ifnet *ifp) { struct pfsync_softc *sc = ifp->if_softc; timeout_del(&sc->sc_bulk_tmo); timeout_del(&sc->sc_tmo); #if NCARP > 0 if (!pfsync_sync_ok) carp_group_demote_adj(&sc->sc_if, -1); #endif #if NBPFILTER > 0 bpfdetach(ifp); #endif if_detach(ifp); pfsync_drop(sc); while (sc->sc_deferred > 0) pfsync_undefer(TAILQ_FIRST(&sc->sc_deferrals), 0); pool_destroy(&sc->sc_pool); free(sc->sc_imo.imo_membership, M_IPMOPTS); free(sc, M_DEVBUF); pfsyncif = NULL; return (0); } struct mbuf * pfsync_if_dequeue(struct ifnet *ifp) { struct mbuf *m; IF_DEQUEUE(&ifp->if_snd, m); return (m); } /* * Start output on the pfsync interface. */ void pfsyncstart(struct ifnet *ifp) { struct mbuf *m; int s; s = splnet(); while ((m = pfsync_if_dequeue(ifp)) != NULL) { IF_DROP(&ifp->if_snd); m_freem(m); } splx(s); } int pfsync_alloc_scrub_memory(struct pfsync_state_peer *s, struct pf_state_peer *d) { if (s->scrub.scrub_flag && d->scrub == NULL) { d->scrub = pool_get(&pf_state_scrub_pl, PR_NOWAIT | PR_ZERO); if (d->scrub == NULL) return (ENOMEM); } return (0); } void pfsync_state_export(struct pfsync_state *sp, struct pf_state *st) { bzero(sp, sizeof(struct pfsync_state)); /* copy from state key */ sp->key[PF_SK_WIRE].addr[0] = st->key[PF_SK_WIRE]->addr[0]; sp->key[PF_SK_WIRE].addr[1] = st->key[PF_SK_WIRE]->addr[1]; sp->key[PF_SK_WIRE].port[0] = st->key[PF_SK_WIRE]->port[0]; sp->key[PF_SK_WIRE].port[1] = st->key[PF_SK_WIRE]->port[1]; sp->key[PF_SK_WIRE].rdomain = htons(st->key[PF_SK_WIRE]->rdomain); sp->key[PF_SK_STACK].addr[0] = st->key[PF_SK_STACK]->addr[0]; sp->key[PF_SK_STACK].addr[1] = st->key[PF_SK_STACK]->addr[1]; sp->key[PF_SK_STACK].port[0] = st->key[PF_SK_STACK]->port[0]; sp->key[PF_SK_STACK].port[1] = st->key[PF_SK_STACK]->port[1]; sp->key[PF_SK_STACK].rdomain = htons(st->key[PF_SK_STACK]->rdomain); sp->rtableid[PF_SK_WIRE] = htonl(st->rtableid[PF_SK_WIRE]); sp->rtableid[PF_SK_STACK] = htonl(st->rtableid[PF_SK_STACK]); sp->proto = st->key[PF_SK_WIRE]->proto; sp->af = st->key[PF_SK_WIRE]->af; /* copy from state */ strlcpy(sp->ifname, st->kif->pfik_name, sizeof(sp->ifname)); bcopy(&st->rt_addr, &sp->rt_addr, sizeof(sp->rt_addr)); sp->creation = htonl(time_second - st->creation); sp->expire = pf_state_expires(st); if (sp->expire <= time_second) sp->expire = htonl(0); else sp->expire = htonl(sp->expire - time_second); sp->direction = st->direction; sp->log = st->log; sp->timeout = st->timeout; sp->state_flags = st->state_flags; if (st->src_node) sp->sync_flags |= PFSYNC_FLAG_SRCNODE; bcopy(&st->id, &sp->id, sizeof(sp->id)); sp->creatorid = st->creatorid; pf_state_peer_hton(&st->src, &sp->src); pf_state_peer_hton(&st->dst, &sp->dst); if (st->rule.ptr == NULL) sp->rule = htonl(-1); else sp->rule = htonl(st->rule.ptr->nr); if (st->anchor.ptr == NULL) sp->anchor = htonl(-1); else sp->anchor = htonl(st->anchor.ptr->nr); sp->nat_rule = htonl(-1); /* left for compat, nat_rule is gone */ pf_state_counter_hton(st->packets[0], sp->packets[0]); pf_state_counter_hton(st->packets[1], sp->packets[1]); pf_state_counter_hton(st->bytes[0], sp->bytes[0]); pf_state_counter_hton(st->bytes[1], sp->bytes[1]); sp->max_mss = htons(st->max_mss); sp->min_ttl = st->min_ttl; sp->set_tos = st->set_tos; } int pfsync_state_import(struct pfsync_state *sp, u_int8_t flags) { struct pf_state *st = NULL; struct pf_state_key *skw = NULL, *sks = NULL; struct pf_rule *r = NULL; struct pfi_kif *kif; int pool_flags; int error; if (sp->creatorid == 0 && pf_status.debug >= PF_DEBUG_MISC) { printf("pfsync_state_import: invalid creator id:" " %08x\n", ntohl(sp->creatorid)); return (EINVAL); } if ((kif = pfi_kif_get(sp->ifname)) == NULL) { if (pf_status.debug >= PF_DEBUG_MISC) printf("pfsync_state_import: " "unknown interface: %s\n", sp->ifname); if (flags & PFSYNC_SI_IOCTL) return (EINVAL); return (0); /* skip this state */ } /* * If the ruleset checksums match or the state is coming from the ioctl, * it's safe to associate the state with the rule of that number. */ if (sp->rule != htonl(-1) && sp->anchor == htonl(-1) && (flags & (PFSYNC_SI_IOCTL | PFSYNC_SI_CKSUM)) && ntohl(sp->rule) < pf_main_ruleset.rules.active.rcount) r = pf_main_ruleset.rules.active.ptr_array[ntohl(sp->rule)]; else r = &pf_default_rule; if ((r->max_states && r->states_cur >= r->max_states)) goto cleanup; if (flags & PFSYNC_SI_IOCTL) pool_flags = PR_WAITOK | PR_LIMITFAIL | PR_ZERO; else pool_flags = PR_LIMITFAIL | PR_ZERO; if ((st = pool_get(&pf_state_pl, pool_flags)) == NULL) goto cleanup; if ((skw = pf_alloc_state_key(pool_flags)) == NULL) goto cleanup; if (PF_ANEQ(&sp->key[PF_SK_WIRE].addr[0], &sp->key[PF_SK_STACK].addr[0], sp->af) || PF_ANEQ(&sp->key[PF_SK_WIRE].addr[1], &sp->key[PF_SK_STACK].addr[1], sp->af) || sp->key[PF_SK_WIRE].port[0] != sp->key[PF_SK_STACK].port[0] || sp->key[PF_SK_WIRE].port[1] != sp->key[PF_SK_STACK].port[1] || sp->key[PF_SK_WIRE].rdomain != sp->key[PF_SK_STACK].rdomain) { if ((sks = pf_alloc_state_key(pool_flags)) == NULL) goto cleanup; } else sks = skw; /* allocate memory for scrub info */ if (pfsync_alloc_scrub_memory(&sp->src, &st->src) || pfsync_alloc_scrub_memory(&sp->dst, &st->dst)) goto cleanup; /* copy to state key(s) */ skw->addr[0] = sp->key[PF_SK_WIRE].addr[0]; skw->addr[1] = sp->key[PF_SK_WIRE].addr[1]; skw->port[0] = sp->key[PF_SK_WIRE].port[0]; skw->port[1] = sp->key[PF_SK_WIRE].port[1]; skw->rdomain = ntohs(sp->key[PF_SK_WIRE].rdomain); skw->proto = sp->proto; skw->af = sp->af; if (sks != skw) { sks->addr[0] = sp->key[PF_SK_STACK].addr[0]; sks->addr[1] = sp->key[PF_SK_STACK].addr[1]; sks->port[0] = sp->key[PF_SK_STACK].port[0]; sks->port[1] = sp->key[PF_SK_STACK].port[1]; sks->rdomain = ntohs(sp->key[PF_SK_STACK].rdomain); sks->proto = sp->proto; sks->af = sp->af; } st->rtableid[PF_SK_WIRE] = ntohl(sp->rtableid[PF_SK_WIRE]); st->rtableid[PF_SK_STACK] = ntohl(sp->rtableid[PF_SK_STACK]); /* copy to state */ bcopy(&sp->rt_addr, &st->rt_addr, sizeof(st->rt_addr)); st->creation = time_second - ntohl(sp->creation); st->expire = time_second; if (sp->expire) { /* XXX No adaptive scaling. */ st->expire -= r->timeout[sp->timeout] - ntohl(sp->expire); } st->expire = ntohl(sp->expire) + time_second; st->direction = sp->direction; st->log = sp->log; st->timeout = sp->timeout; st->state_flags = sp->state_flags; st->max_mss = ntohs(sp->max_mss); st->min_ttl = sp->min_ttl; st->set_tos = sp->set_tos; bcopy(sp->id, &st->id, sizeof(st->id)); st->creatorid = sp->creatorid; pf_state_peer_ntoh(&sp->src, &st->src); pf_state_peer_ntoh(&sp->dst, &st->dst); st->rule.ptr = r; st->anchor.ptr = NULL; st->rt_kif = NULL; st->pfsync_time = time_uptime; st->sync_state = PFSYNC_S_NONE; /* XXX when we have anchors, use STATE_INC_COUNTERS */ r->states_cur++; r->states_tot++; if (!ISSET(flags, PFSYNC_SI_IOCTL)) SET(st->state_flags, PFSTATE_NOSYNC); if (pf_state_insert(kif, skw, sks, st) != 0) { /* XXX when we have anchors, use STATE_DEC_COUNTERS */ r->states_cur--; error = EEXIST; goto cleanup_state; } if (!ISSET(flags, PFSYNC_SI_IOCTL)) { CLR(st->state_flags, PFSTATE_NOSYNC); if (ISSET(st->state_flags, PFSTATE_ACK)) { pfsync_q_ins(st, PFSYNC_S_IACK); schednetisr(NETISR_PFSYNC); } } CLR(st->state_flags, PFSTATE_ACK); return (0); cleanup: error = ENOMEM; if (skw == sks) sks = NULL; if (skw != NULL) pool_put(&pf_state_key_pl, skw); if (sks != NULL) pool_put(&pf_state_key_pl, sks); cleanup_state: /* pf_state_insert frees the state keys */ if (st) { if (st->dst.scrub) pool_put(&pf_state_scrub_pl, st->dst.scrub); if (st->src.scrub) pool_put(&pf_state_scrub_pl, st->src.scrub); pool_put(&pf_state_pl, st); } return (error); } void pfsync_input(struct mbuf *m, ...) { struct pfsync_softc *sc = pfsyncif; struct pfsync_pkt pkt; struct ip *ip = mtod(m, struct ip *); struct pfsync_header *ph; struct pfsync_subheader subh; int offset, len; int rv; pfsyncstats.pfsyncs_ipackets++; /* verify that we have a sync interface configured */ if (sc == NULL || !ISSET(sc->sc_if.if_flags, IFF_RUNNING) || sc->sc_sync_if == NULL || !pf_status.running) goto done; /* verify that the packet came in on the right interface */ if (sc->sc_sync_if != m->m_pkthdr.rcvif) { pfsyncstats.pfsyncs_badif++; goto done; } sc->sc_if.if_ipackets++; sc->sc_if.if_ibytes += m->m_pkthdr.len; /* verify that the IP TTL is 255. */ if (ip->ip_ttl != PFSYNC_DFLTTL) { pfsyncstats.pfsyncs_badttl++; goto done; } offset = ip->ip_hl << 2; if (m->m_pkthdr.len < offset + sizeof(*ph)) { pfsyncstats.pfsyncs_hdrops++; goto done; } if (offset + sizeof(*ph) > m->m_len) { if (m_pullup(m, offset + sizeof(*ph)) == NULL) { pfsyncstats.pfsyncs_hdrops++; return; } ip = mtod(m, struct ip *); } ph = (struct pfsync_header *)((char *)ip + offset); /* verify the version */ if (ph->version != PFSYNC_VERSION) { pfsyncstats.pfsyncs_badver++; goto done; } len = ntohs(ph->len) + offset; if (m->m_pkthdr.len < len) { pfsyncstats.pfsyncs_badlen++; goto done; } /* Cheaper to grab this now than having to mess with mbufs later */ pkt.ip = ip; pkt.src = ip->ip_src; pkt.flags = 0; if (!bcmp(&ph->pfcksum, &pf_status.pf_chksum, PF_MD5_DIGEST_LENGTH)) pkt.flags |= PFSYNC_SI_CKSUM; offset += sizeof(*ph); while (offset <= len - sizeof(subh)) { m_copydata(m, offset, sizeof(subh), (caddr_t)&subh); offset += sizeof(subh); if (subh.action >= PFSYNC_ACT_MAX || subh.action >= nitems(pfsync_acts)) { pfsyncstats.pfsyncs_badact++; goto done; } rv = (*pfsync_acts[subh.action])(&pkt, m, offset, ntohs(subh.count)); if (rv == -1) return; offset += rv; } done: m_freem(m); } int pfsync_in_clr(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count) { struct pfsync_clr *clr; struct mbuf *mp; int len = sizeof(*clr) * count; int i, offp; struct pf_state *st, *nexts; struct pf_state_key *sk, *nextsk; struct pf_state_item *si; u_int32_t creatorid; int s; mp = m_pulldown(m, offset, len, &offp); if (mp == NULL) { pfsyncstats.pfsyncs_badlen++; return (-1); } clr = (struct pfsync_clr *)(mp->m_data + offp); s = splsoftnet(); for (i = 0; i < count; i++) { creatorid = clr[i].creatorid; if (clr[i].ifname[0] == '\0') { for (st = RB_MIN(pf_state_tree_id, &tree_id); st; st = nexts) { nexts = RB_NEXT(pf_state_tree_id, &tree_id, st); if (st->creatorid == creatorid) { SET(st->state_flags, PFSTATE_NOSYNC); pf_unlink_state(st); } } } else { if (pfi_kif_get(clr[i].ifname) == NULL) continue; /* XXX correct? */ for (sk = RB_MIN(pf_state_tree, &pf_statetbl); sk; sk = nextsk) { nextsk = RB_NEXT(pf_state_tree, &pf_statetbl, sk); TAILQ_FOREACH(si, &sk->states, entry) { if (si->s->creatorid == creatorid) { SET(si->s->state_flags, PFSTATE_NOSYNC); pf_unlink_state(si->s); } } } } } splx(s); return (len); } int pfsync_in_ins(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count) { struct mbuf *mp; struct pfsync_state *sa, *sp; int len = sizeof(*sp) * count; int i, offp; int s; mp = m_pulldown(m, offset, len, &offp); if (mp == NULL) { pfsyncstats.pfsyncs_badlen++; return (-1); } sa = (struct pfsync_state *)(mp->m_data + offp); s = splsoftnet(); for (i = 0; i < count; i++) { sp = &sa[i]; /* check for invalid values */ if (sp->timeout >= PFTM_MAX || sp->src.state > PF_TCPS_PROXY_DST || sp->dst.state > PF_TCPS_PROXY_DST || sp->direction > PF_OUT || (sp->af != AF_INET && sp->af != AF_INET6)) { if (pf_status.debug >= PF_DEBUG_MISC) { printf("pfsync_input: PFSYNC5_ACT_INS: " "invalid value\n"); } pfsyncstats.pfsyncs_badval++; continue; } if (pfsync_state_import(sp, pkt->flags) == ENOMEM) { /* drop out, but process the rest of the actions */ break; } } splx(s); return (len); } int pfsync_in_iack(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count) { struct pfsync_ins_ack *ia, *iaa; struct pf_state_cmp id_key; struct pf_state *st; struct mbuf *mp; int len = count * sizeof(*ia); int offp, i; int s; mp = m_pulldown(m, offset, len, &offp); if (mp == NULL) { pfsyncstats.pfsyncs_badlen++; return (-1); } iaa = (struct pfsync_ins_ack *)(mp->m_data + offp); s = splsoftnet(); for (i = 0; i < count; i++) { ia = &iaa[i]; bcopy(&ia->id, &id_key.id, sizeof(id_key.id)); id_key.creatorid = ia->creatorid; st = pf_find_state_byid(&id_key); if (st == NULL) continue; if (ISSET(st->state_flags, PFSTATE_ACK)) pfsync_deferred(st, 0); } splx(s); return (len); } int pfsync_upd_tcp(struct pf_state *st, struct pfsync_state_peer *src, struct pfsync_state_peer *dst) { int sync = 0; /* * The state should never go backwards except * for syn-proxy states. Neither should the * sequence window slide backwards. */ if ((st->src.state > src->state && (st->src.state < PF_TCPS_PROXY_SRC || src->state >= PF_TCPS_PROXY_SRC)) || (st->src.state == src->state && SEQ_GT(st->src.seqlo, ntohl(src->seqlo)))) sync++; else pf_state_peer_ntoh(src, &st->src); if ((st->dst.state > dst->state) || (st->dst.state >= TCPS_SYN_SENT && SEQ_GT(st->dst.seqlo, ntohl(dst->seqlo)))) sync++; else pf_state_peer_ntoh(dst, &st->dst); return (sync); } int pfsync_in_upd(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count) { struct pfsync_state *sa, *sp; struct pf_state_cmp id_key; struct pf_state *st; int sync; struct mbuf *mp; int len = count * sizeof(*sp); int offp, i; int s; mp = m_pulldown(m, offset, len, &offp); if (mp == NULL) { pfsyncstats.pfsyncs_badlen++; return (-1); } sa = (struct pfsync_state *)(mp->m_data + offp); s = splsoftnet(); for (i = 0; i < count; i++) { sp = &sa[i]; /* check for invalid values */ if (sp->timeout >= PFTM_MAX || sp->src.state > PF_TCPS_PROXY_DST || sp->dst.state > PF_TCPS_PROXY_DST) { if (pf_status.debug >= PF_DEBUG_MISC) { printf("pfsync_input: PFSYNC_ACT_UPD: " "invalid value\n"); } pfsyncstats.pfsyncs_badval++; continue; } bcopy(sp->id, &id_key.id, sizeof(id_key.id)); id_key.creatorid = sp->creatorid; st = pf_find_state_byid(&id_key); if (st == NULL) { /* insert the update */ if (pfsync_state_import(sp, 0)) pfsyncstats.pfsyncs_badstate++; continue; } if (ISSET(st->state_flags, PFSTATE_ACK)) pfsync_deferred(st, 1); if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP) sync = pfsync_upd_tcp(st, &sp->src, &sp->dst); else { sync = 0; /* * Non-TCP protocol state machine always go * forwards */ if (st->src.state > sp->src.state) sync++; else pf_state_peer_ntoh(&sp->src, &st->src); if (st->dst.state > sp->dst.state) sync++; else pf_state_peer_ntoh(&sp->dst, &st->dst); } if (sync < 2) { pfsync_alloc_scrub_memory(&sp->dst, &st->dst); pf_state_peer_ntoh(&sp->dst, &st->dst); st->expire = ntohl(sp->expire) + time_second; st->timeout = sp->timeout; } st->pfsync_time = time_uptime; if (sync) { pfsyncstats.pfsyncs_stale++; pfsync_update_state(st); schednetisr(NETISR_PFSYNC); } } splx(s); return (len); } int pfsync_in_upd_c(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count) { struct pfsync_upd_c *ua, *up; struct pf_state_cmp id_key; struct pf_state *st; int len = count * sizeof(*up); int sync; struct mbuf *mp; int offp, i; int s; mp = m_pulldown(m, offset, len, &offp); if (mp == NULL) { pfsyncstats.pfsyncs_badlen++; return (-1); } ua = (struct pfsync_upd_c *)(mp->m_data + offp); s = splsoftnet(); for (i = 0; i < count; i++) { up = &ua[i]; /* check for invalid values */ if (up->timeout >= PFTM_MAX || up->src.state > PF_TCPS_PROXY_DST || up->dst.state > PF_TCPS_PROXY_DST) { if (pf_status.debug >= PF_DEBUG_MISC) { printf("pfsync_input: " "PFSYNC_ACT_UPD_C: " "invalid value\n"); } pfsyncstats.pfsyncs_badval++; continue; } bcopy(&up->id, &id_key.id, sizeof(id_key.id)); id_key.creatorid = up->creatorid; st = pf_find_state_byid(&id_key); if (st == NULL) { /* We don't have this state. Ask for it. */ pfsync_request_update(id_key.creatorid, id_key.id); continue; } if (ISSET(st->state_flags, PFSTATE_ACK)) pfsync_deferred(st, 1); if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP) sync = pfsync_upd_tcp(st, &up->src, &up->dst); else { sync = 0; /* * Non-TCP protocol state machine always go * forwards */ if (st->src.state > up->src.state) sync++; else pf_state_peer_ntoh(&up->src, &st->src); if (st->dst.state > up->dst.state) sync++; else pf_state_peer_ntoh(&up->dst, &st->dst); } if (sync < 2) { pfsync_alloc_scrub_memory(&up->dst, &st->dst); pf_state_peer_ntoh(&up->dst, &st->dst); st->expire = ntohl(up->expire) + time_second; st->timeout = up->timeout; } st->pfsync_time = time_uptime; if (sync) { pfsyncstats.pfsyncs_stale++; pfsync_update_state(st); schednetisr(NETISR_PFSYNC); } } splx(s); return (len); } int pfsync_in_ureq(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count) { struct pfsync_upd_req *ur, *ura; struct mbuf *mp; int len = count * sizeof(*ur); int i, offp; struct pf_state_cmp id_key; struct pf_state *st; mp = m_pulldown(m, offset, len, &offp); if (mp == NULL) { pfsyncstats.pfsyncs_badlen++; return (-1); } ura = (struct pfsync_upd_req *)(mp->m_data + offp); for (i = 0; i < count; i++) { ur = &ura[i]; bcopy(&ur->id, &id_key.id, sizeof(id_key.id)); id_key.creatorid = ur->creatorid; if (id_key.id == 0 && id_key.creatorid == 0) pfsync_bulk_start(); else { st = pf_find_state_byid(&id_key); if (st == NULL) { pfsyncstats.pfsyncs_badstate++; continue; } if (ISSET(st->state_flags, PFSTATE_NOSYNC)) continue; pfsync_update_state_req(st); } } return (len); } int pfsync_in_del(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count) { struct mbuf *mp; struct pfsync_state *sa, *sp; struct pf_state_cmp id_key; struct pf_state *st; int len = count * sizeof(*sp); int offp, i; int s; mp = m_pulldown(m, offset, len, &offp); if (mp == NULL) { pfsyncstats.pfsyncs_badlen++; return (-1); } sa = (struct pfsync_state *)(mp->m_data + offp); s = splsoftnet(); for (i = 0; i < count; i++) { sp = &sa[i]; bcopy(sp->id, &id_key.id, sizeof(id_key.id)); id_key.creatorid = sp->creatorid; st = pf_find_state_byid(&id_key); if (st == NULL) { pfsyncstats.pfsyncs_badstate++; continue; } SET(st->state_flags, PFSTATE_NOSYNC); pf_unlink_state(st); } splx(s); return (len); } int pfsync_in_del_c(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count) { struct mbuf *mp; struct pfsync_del_c *sa, *sp; struct pf_state_cmp id_key; struct pf_state *st; int len = count * sizeof(*sp); int offp, i; int s; mp = m_pulldown(m, offset, len, &offp); if (mp == NULL) { pfsyncstats.pfsyncs_badlen++; return (-1); } sa = (struct pfsync_del_c *)(mp->m_data + offp); s = splsoftnet(); for (i = 0; i < count; i++) { sp = &sa[i]; bcopy(&sp->id, &id_key.id, sizeof(id_key.id)); id_key.creatorid = sp->creatorid; st = pf_find_state_byid(&id_key); if (st == NULL) { pfsyncstats.pfsyncs_badstate++; continue; } SET(st->state_flags, PFSTATE_NOSYNC); pf_unlink_state(st); } splx(s); return (len); } int pfsync_in_bus(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count) { struct pfsync_softc *sc = pfsyncif; struct pfsync_bus *bus; struct mbuf *mp; int len = count * sizeof(*bus); int offp; /* If we're not waiting for a bulk update, who cares. */ if (sc->sc_ureq_sent == 0) return (len); mp = m_pulldown(m, offset, len, &offp); if (mp == NULL) { pfsyncstats.pfsyncs_badlen++; return (-1); } bus = (struct pfsync_bus *)(mp->m_data + offp); switch (bus->status) { case PFSYNC_BUS_START: timeout_add(&sc->sc_bulkfail_tmo, 4 * hz + pf_pool_limits[PF_LIMIT_STATES].limit / ((sc->sc_if.if_mtu - PFSYNC_MINPKT) / sizeof(struct pfsync_state))); if (pf_status.debug >= PF_DEBUG_MISC) printf("pfsync: received bulk update start\n"); break; case PFSYNC_BUS_END: if (time_uptime - ntohl(bus->endtime) >= sc->sc_ureq_sent) { /* that's it, we're happy */ sc->sc_ureq_sent = 0; sc->sc_bulk_tries = 0; timeout_del(&sc->sc_bulkfail_tmo); #if NCARP > 0 if (!pfsync_sync_ok) carp_group_demote_adj(&sc->sc_if, -1); #endif pfsync_sync_ok = 1; if (pf_status.debug >= PF_DEBUG_MISC) printf("pfsync: received valid " "bulk update end\n"); } else { if (pf_status.debug >= PF_DEBUG_MISC) printf("pfsync: received invalid " "bulk update end: bad timestamp\n"); } break; } return (len); } int pfsync_in_tdb(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count) { int len = count * sizeof(struct pfsync_tdb); #if defined(IPSEC) struct pfsync_tdb *tp; struct mbuf *mp; int offp; int i; int s; mp = m_pulldown(m, offset, len, &offp); if (mp == NULL) { pfsyncstats.pfsyncs_badlen++; return (-1); } tp = (struct pfsync_tdb *)(mp->m_data + offp); s = splsoftnet(); for (i = 0; i < count; i++) pfsync_update_net_tdb(&tp[i]); splx(s); #endif return (len); } #if defined(IPSEC) /* Update an in-kernel tdb. Silently fail if no tdb is found. */ void pfsync_update_net_tdb(struct pfsync_tdb *pt) { struct tdb *tdb; int s; /* check for invalid values */ if (ntohl(pt->spi) <= SPI_RESERVED_MAX || (pt->dst.sa.sa_family != AF_INET && pt->dst.sa.sa_family != AF_INET6)) goto bad; s = spltdb(); tdb = gettdb(pt->spi, &pt->dst, pt->sproto); if (tdb) { pt->rpl = ntohl(pt->rpl); pt->cur_bytes = betoh64(pt->cur_bytes); /* Neither replay nor byte counter should ever decrease. */ if (pt->rpl < tdb->tdb_rpl || pt->cur_bytes < tdb->tdb_cur_bytes) { splx(s); goto bad; } tdb->tdb_rpl = pt->rpl; tdb->tdb_cur_bytes = pt->cur_bytes; } splx(s); return; bad: if (pf_status.debug >= PF_DEBUG_MISC) printf("pfsync_insert: PFSYNC_ACT_TDB_UPD: " "invalid value\n"); pfsyncstats.pfsyncs_badstate++; return; } #endif int pfsync_in_eof(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count) { /* check if we are at the right place in the packet */ if (offset != m->m_pkthdr.len) pfsyncstats.pfsyncs_badlen++; /* we're done. free and let the caller return */ m_freem(m); return (-1); } int pfsync_in_error(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count) { pfsyncstats.pfsyncs_badact++; m_freem(m); return (-1); } int pfsyncoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, struct rtentry *rt) { m_freem(m); return (0); } /* ARGSUSED */ int pfsyncioctl(struct ifnet *ifp, u_long cmd, caddr_t data) { struct proc *p = curproc; struct pfsync_softc *sc = ifp->if_softc; struct ifreq *ifr = (struct ifreq *)data; struct ip_moptions *imo = &sc->sc_imo; struct pfsyncreq pfsyncr; struct ifnet *sifp; struct ip *ip; int s, error; switch (cmd) { #if 0 case SIOCSIFADDR: case SIOCAIFADDR: case SIOCSIFDSTADDR: #endif case SIOCSIFFLAGS: s = splnet(); if (ifp->if_flags & IFF_UP) ifp->if_flags |= IFF_RUNNING; else { ifp->if_flags &= ~IFF_RUNNING; /* drop everything */ timeout_del(&sc->sc_tmo); pfsync_drop(sc); /* cancel bulk update */ timeout_del(&sc->sc_bulk_tmo); sc->sc_bulk_next = NULL; sc->sc_bulk_last = NULL; } splx(s); break; case SIOCSIFMTU: s = splnet(); if (ifr->ifr_mtu <= PFSYNC_MINPKT) return (EINVAL); if (ifr->ifr_mtu > MCLBYTES) /* XXX could be bigger */ ifr->ifr_mtu = MCLBYTES; if (ifr->ifr_mtu < ifp->if_mtu) pfsync_sendout(); ifp->if_mtu = ifr->ifr_mtu; splx(s); break; case SIOCGETPFSYNC: bzero(&pfsyncr, sizeof(pfsyncr)); if (sc->sc_sync_if) { strlcpy(pfsyncr.pfsyncr_syncdev, sc->sc_sync_if->if_xname, IFNAMSIZ); } pfsyncr.pfsyncr_syncpeer = sc->sc_sync_peer; pfsyncr.pfsyncr_maxupdates = sc->sc_maxupdates; pfsyncr.pfsyncr_defer = sc->sc_defer; return (copyout(&pfsyncr, ifr->ifr_data, sizeof(pfsyncr))); case SIOCSETPFSYNC: if ((error = suser(p, p->p_acflag)) != 0) return (error); if ((error = copyin(ifr->ifr_data, &pfsyncr, sizeof(pfsyncr)))) return (error); s = splnet(); if (pfsyncr.pfsyncr_syncpeer.s_addr == 0) sc->sc_sync_peer.s_addr = INADDR_PFSYNC_GROUP; else sc->sc_sync_peer.s_addr = pfsyncr.pfsyncr_syncpeer.s_addr; if (pfsyncr.pfsyncr_maxupdates > 255) { splx(s); return (EINVAL); } sc->sc_maxupdates = pfsyncr.pfsyncr_maxupdates; sc->sc_defer = pfsyncr.pfsyncr_defer; if (pfsyncr.pfsyncr_syncdev[0] == 0) { sc->sc_sync_if = NULL; if (imo->imo_num_memberships > 0) { in_delmulti(imo->imo_membership[ --imo->imo_num_memberships]); imo->imo_multicast_ifp = NULL; } splx(s); break; } if ((sifp = ifunit(pfsyncr.pfsyncr_syncdev)) == NULL) { splx(s); return (EINVAL); } if (sifp->if_mtu < sc->sc_if.if_mtu || (sc->sc_sync_if != NULL && sifp->if_mtu < sc->sc_sync_if->if_mtu) || sifp->if_mtu < MCLBYTES - sizeof(struct ip)) pfsync_sendout(); sc->sc_sync_if = sifp; if (imo->imo_num_memberships > 0) { in_delmulti(imo->imo_membership[--imo->imo_num_memberships]); imo->imo_multicast_ifp = NULL; } if (sc->sc_sync_if && sc->sc_sync_peer.s_addr == INADDR_PFSYNC_GROUP) { struct in_addr addr; if (!(sc->sc_sync_if->if_flags & IFF_MULTICAST)) { sc->sc_sync_if = NULL; splx(s); return (EADDRNOTAVAIL); } addr.s_addr = INADDR_PFSYNC_GROUP; if ((imo->imo_membership[0] = in_addmulti(&addr, sc->sc_sync_if)) == NULL) { sc->sc_sync_if = NULL; splx(s); return (ENOBUFS); } imo->imo_num_memberships++; imo->imo_multicast_ifp = sc->sc_sync_if; imo->imo_multicast_ttl = PFSYNC_DFLTTL; imo->imo_multicast_loop = 0; } ip = &sc->sc_template; bzero(ip, sizeof(*ip)); ip->ip_v = IPVERSION; ip->ip_hl = sizeof(sc->sc_template) >> 2; ip->ip_tos = IPTOS_LOWDELAY; /* len and id are set later */ ip->ip_off = htons(IP_DF); ip->ip_ttl = PFSYNC_DFLTTL; ip->ip_p = IPPROTO_PFSYNC; ip->ip_src.s_addr = INADDR_ANY; ip->ip_dst.s_addr = sc->sc_sync_peer.s_addr; if (sc->sc_sync_if) { /* Request a full state table update. */ sc->sc_ureq_sent = time_uptime; #if NCARP > 0 if (pfsync_sync_ok) carp_group_demote_adj(&sc->sc_if, 1); #endif pfsync_sync_ok = 0; if (pf_status.debug >= PF_DEBUG_MISC) printf("pfsync: requesting bulk update\n"); timeout_add(&sc->sc_bulkfail_tmo, 4 * hz + pf_pool_limits[PF_LIMIT_STATES].limit / ((sc->sc_if.if_mtu - PFSYNC_MINPKT) / sizeof(struct pfsync_state))); pfsync_request_update(0, 0); } splx(s); break; default: return (ENOTTY); } return (0); } void pfsync_out_state(struct pf_state *st, void *buf) { struct pfsync_state *sp = buf; pfsync_state_export(sp, st); } void pfsync_out_iack(struct pf_state *st, void *buf) { struct pfsync_ins_ack *iack = buf; iack->id = st->id; iack->creatorid = st->creatorid; } void pfsync_out_upd_c(struct pf_state *st, void *buf) { struct pfsync_upd_c *up = buf; up->id = st->id; pf_state_peer_hton(&st->src, &up->src); pf_state_peer_hton(&st->dst, &up->dst); up->creatorid = st->creatorid; up->expire = pf_state_expires(st); if (up->expire <= time_second) up->expire = htonl(0); else up->expire = htonl(up->expire - time_second); up->timeout = st->timeout; bzero(up->_pad, sizeof(up->_pad)); /* XXX */ } void pfsync_out_del(struct pf_state *st, void *buf) { struct pfsync_del_c *dp = buf; dp->id = st->id; dp->creatorid = st->creatorid; SET(st->state_flags, PFSTATE_NOSYNC); } void pfsync_drop(struct pfsync_softc *sc) { struct pf_state *st; struct pfsync_upd_req_item *ur; struct tdb *t; int q; for (q = 0; q < PFSYNC_S_COUNT; q++) { if (TAILQ_EMPTY(&sc->sc_qs[q])) continue; TAILQ_FOREACH(st, &sc->sc_qs[q], sync_list) { #ifdef PFSYNC_DEBUG KASSERT(st->sync_state == q); #endif st->sync_state = PFSYNC_S_NONE; } TAILQ_INIT(&sc->sc_qs[q]); } while ((ur = TAILQ_FIRST(&sc->sc_upd_req_list)) != NULL) { TAILQ_REMOVE(&sc->sc_upd_req_list, ur, ur_entry); pool_put(&sc->sc_pool, ur); } sc->sc_plus = NULL; if (!TAILQ_EMPTY(&sc->sc_tdb_q)) { TAILQ_FOREACH(t, &sc->sc_tdb_q, tdb_sync_entry) CLR(t->tdb_flags, TDBF_PFSYNC); TAILQ_INIT(&sc->sc_tdb_q); } sc->sc_len = PFSYNC_MINPKT; } void pfsync_sendout(void) { struct pfsync_softc *sc = pfsyncif; #if NBPFILTER > 0 struct ifnet *ifp = &sc->sc_if; #endif struct mbuf *m; struct ip *ip; struct pfsync_header *ph; struct pfsync_subheader *subh; struct pf_state *st; struct pfsync_upd_req_item *ur; struct tdb *t; int offset; int q, count = 0; if (sc == NULL || sc->sc_len == PFSYNC_MINPKT) return; if (!ISSET(sc->sc_if.if_flags, IFF_RUNNING) || #if NBPFILTER > 0 (ifp->if_bpf == NULL && sc->sc_sync_if == NULL)) { #else sc->sc_sync_if == NULL) { #endif pfsync_drop(sc); return; } MGETHDR(m, M_DONTWAIT, MT_DATA); if (m == NULL) { sc->sc_if.if_oerrors++; pfsyncstats.pfsyncs_onomem++; pfsync_drop(sc); return; } if (max_linkhdr + sc->sc_len > MHLEN) { MCLGETI(m, M_DONTWAIT, NULL, max_linkhdr + sc->sc_len); if (!ISSET(m->m_flags, M_EXT)) { m_free(m); sc->sc_if.if_oerrors++; pfsyncstats.pfsyncs_onomem++; pfsync_drop(sc); return; } } m->m_data += max_linkhdr; m->m_len = m->m_pkthdr.len = sc->sc_len; /* build the ip header */ ip = (struct ip *)m->m_data; bcopy(&sc->sc_template, ip, sizeof(*ip)); offset = sizeof(*ip); ip->ip_len = htons(m->m_pkthdr.len); ip->ip_id = htons(ip_randomid()); /* build the pfsync header */ ph = (struct pfsync_header *)(m->m_data + offset); bzero(ph, sizeof(*ph)); offset += sizeof(*ph); ph->version = PFSYNC_VERSION; ph->len = htons(sc->sc_len - sizeof(*ip)); bcopy(pf_status.pf_chksum, ph->pfcksum, PF_MD5_DIGEST_LENGTH); if (!TAILQ_EMPTY(&sc->sc_upd_req_list)) { subh = (struct pfsync_subheader *)(m->m_data + offset); offset += sizeof(*subh); count = 0; while ((ur = TAILQ_FIRST(&sc->sc_upd_req_list)) != NULL) { TAILQ_REMOVE(&sc->sc_upd_req_list, ur, ur_entry); bcopy(&ur->ur_msg, m->m_data + offset, sizeof(ur->ur_msg)); offset += sizeof(ur->ur_msg); pool_put(&sc->sc_pool, ur); count++; } bzero(subh, sizeof(*subh)); subh->action = PFSYNC_ACT_UPD_REQ; subh->count = htons(count); } /* has someone built a custom region for us to add? */ if (sc->sc_plus != NULL) { bcopy(sc->sc_plus, m->m_data + offset, sc->sc_pluslen); offset += sc->sc_pluslen; sc->sc_plus = NULL; } if (!TAILQ_EMPTY(&sc->sc_tdb_q)) { subh = (struct pfsync_subheader *)(m->m_data + offset); offset += sizeof(*subh); count = 0; TAILQ_FOREACH(t, &sc->sc_tdb_q, tdb_sync_entry) { pfsync_out_tdb(t, m->m_data + offset); offset += sizeof(struct pfsync_tdb); CLR(t->tdb_flags, TDBF_PFSYNC); count++; } TAILQ_INIT(&sc->sc_tdb_q); bzero(subh, sizeof(*subh)); subh->action = PFSYNC_ACT_TDB; subh->count = htons(count); } /* walk the queues */ for (q = 0; q < PFSYNC_S_COUNT; q++) { if (TAILQ_EMPTY(&sc->sc_qs[q])) continue; subh = (struct pfsync_subheader *)(m->m_data + offset); offset += sizeof(*subh); count = 0; TAILQ_FOREACH(st, &sc->sc_qs[q], sync_list) { #ifdef PFSYNC_DEBUG KASSERT(st->sync_state == q); #endif pfsync_qs[q].write(st, m->m_data + offset); offset += pfsync_qs[q].len; st->sync_state = PFSYNC_S_NONE; count++; } TAILQ_INIT(&sc->sc_qs[q]); bzero(subh, sizeof(*subh)); subh->action = pfsync_qs[q].action; subh->count = htons(count); } subh = (struct pfsync_subheader *)(m->m_data + offset); offset += sizeof(*subh); bzero(subh, sizeof(*subh)); subh->action = PFSYNC_ACT_EOF; subh->count = htons(1); /* we're done, let's put it on the wire */ #if NBPFILTER > 0 if (ifp->if_bpf) { m->m_data += sizeof(*ip); m->m_len = m->m_pkthdr.len = sc->sc_len - sizeof(*ip); bpf_mtap(ifp->if_bpf, m, BPF_DIRECTION_OUT); m->m_data -= sizeof(*ip); m->m_len = m->m_pkthdr.len = sc->sc_len; } if (sc->sc_sync_if == NULL) { sc->sc_len = PFSYNC_MINPKT; m_freem(m); return; } #endif sc->sc_if.if_opackets++; sc->sc_if.if_obytes += m->m_pkthdr.len; if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL) == 0) pfsyncstats.pfsyncs_opackets++; else pfsyncstats.pfsyncs_oerrors++; /* start again */ sc->sc_len = PFSYNC_MINPKT; } void pfsync_insert_state(struct pf_state *st) { struct pfsync_softc *sc = pfsyncif; splsoftassert(IPL_SOFTNET); if (ISSET(st->rule.ptr->rule_flag, PFRULE_NOSYNC) || st->key[PF_SK_WIRE]->proto == IPPROTO_PFSYNC) { SET(st->state_flags, PFSTATE_NOSYNC); return; } if (sc == NULL || !ISSET(sc->sc_if.if_flags, IFF_RUNNING) || ISSET(st->state_flags, PFSTATE_NOSYNC)) return; #ifdef PFSYNC_DEBUG KASSERT(st->sync_state == PFSYNC_S_NONE); #endif if (sc->sc_len == PFSYNC_MINPKT) timeout_add_sec(&sc->sc_tmo, 1); pfsync_q_ins(st, PFSYNC_S_INS); st->sync_updates = 0; } int defer = 10; int pfsync_defer(struct pf_state *st, struct mbuf *m) { struct pfsync_softc *sc = pfsyncif; struct pfsync_deferral *pd; splsoftassert(IPL_SOFTNET); if (!sc->sc_defer) return (0); if (sc->sc_deferred >= 128) pfsync_undefer(TAILQ_FIRST(&sc->sc_deferrals), 0); pd = pool_get(&sc->sc_pool, M_NOWAIT); if (pd == NULL) return (0); sc->sc_deferred++; m->m_pkthdr.pf.flags |= PF_TAG_GENERATED; SET(st->state_flags, PFSTATE_ACK); pd->pd_st = st; pd->pd_m = m; TAILQ_INSERT_TAIL(&sc->sc_deferrals, pd, pd_entry); timeout_set(&pd->pd_tmo, pfsync_defer_tmo, pd); timeout_add(&pd->pd_tmo, defer); schednetisr(NETISR_PFSYNC); return (1); } void pfsync_undefer(struct pfsync_deferral *pd, int drop) { struct pfsync_softc *sc = pfsyncif; splsoftassert(IPL_SOFTNET); TAILQ_REMOVE(&sc->sc_deferrals, pd, pd_entry); sc->sc_deferred--; CLR(pd->pd_st->state_flags, PFSTATE_ACK); timeout_del(&pd->pd_tmo); /* bah */ if (drop) m_freem(pd->pd_m); else { ip_output(pd->pd_m, (void *)NULL, (void *)NULL, 0, (void *)NULL, (void *)NULL); } pool_put(&sc->sc_pool, pd); } void pfsync_defer_tmo(void *arg) { int s; s = splsoftnet(); pfsync_undefer(arg, 0); splx(s); } void pfsync_deferred(struct pf_state *st, int drop) { struct pfsync_softc *sc = pfsyncif; struct pfsync_deferral *pd; TAILQ_FOREACH(pd, &sc->sc_deferrals, pd_entry) { if (pd->pd_st == st) { pfsync_undefer(pd, drop); return; } } panic("pfsync_send_deferred: unable to find deferred state"); } u_int pfsync_upds = 0; void pfsync_update_state(struct pf_state *st) { struct pfsync_softc *sc = pfsyncif; int sync = 0; splsoftassert(IPL_SOFTNET); if (sc == NULL || !ISSET(sc->sc_if.if_flags, IFF_RUNNING)) return; if (ISSET(st->state_flags, PFSTATE_ACK)) pfsync_deferred(st, 0); if (ISSET(st->state_flags, PFSTATE_NOSYNC)) { if (st->sync_state != PFSYNC_S_NONE) pfsync_q_del(st); return; } if (sc->sc_len == PFSYNC_MINPKT) timeout_add_sec(&sc->sc_tmo, 1); switch (st->sync_state) { case PFSYNC_S_UPD_C: case PFSYNC_S_UPD: case PFSYNC_S_INS: /* we're already handling it */ if (st->key[PF_SK_WIRE]->proto == IPPROTO_TCP) { st->sync_updates++; if (st->sync_updates >= sc->sc_maxupdates) sync = 1; } break; case PFSYNC_S_IACK: pfsync_q_del(st); case PFSYNC_S_NONE: pfsync_q_ins(st, PFSYNC_S_UPD_C); st->sync_updates = 0; break; default: panic("pfsync_update_state: unexpected sync state %d", st->sync_state); } if (sync || (time_uptime - st->pfsync_time) < 2) { pfsync_upds++; schednetisr(NETISR_PFSYNC); } } void pfsync_request_update(u_int32_t creatorid, u_int64_t id) { struct pfsync_softc *sc = pfsyncif; struct pfsync_upd_req_item *item; size_t nlen = sizeof(struct pfsync_upd_req); /* * this code does nothing to prevent multiple update requests for the * same state being generated. */ item = pool_get(&sc->sc_pool, PR_NOWAIT); if (item == NULL) { /* XXX stats */ return; } item->ur_msg.id = id; item->ur_msg.creatorid = creatorid; if (TAILQ_EMPTY(&sc->sc_upd_req_list)) nlen += sizeof(struct pfsync_subheader); if (sc->sc_len + nlen > sc->sc_if.if_mtu) { pfsync_sendout(); nlen = sizeof(struct pfsync_subheader) + sizeof(struct pfsync_upd_req); } TAILQ_INSERT_TAIL(&sc->sc_upd_req_list, item, ur_entry); sc->sc_len += nlen; schednetisr(NETISR_PFSYNC); } void pfsync_update_state_req(struct pf_state *st) { struct pfsync_softc *sc = pfsyncif; if (sc == NULL) panic("pfsync_update_state_req: nonexistant instance"); if (ISSET(st->state_flags, PFSTATE_NOSYNC)) { if (st->sync_state != PFSYNC_S_NONE) pfsync_q_del(st); return; } switch (st->sync_state) { case PFSYNC_S_UPD_C: case PFSYNC_S_IACK: pfsync_q_del(st); case PFSYNC_S_NONE: pfsync_q_ins(st, PFSYNC_S_UPD); schednetisr(NETISR_PFSYNC); return; case PFSYNC_S_INS: case PFSYNC_S_UPD: case PFSYNC_S_DEL: /* we're already handling it */ return; default: panic("pfsync_update_state_req: unexpected sync state %d", st->sync_state); } } void pfsync_delete_state(struct pf_state *st) { struct pfsync_softc *sc = pfsyncif; splsoftassert(IPL_SOFTNET); if (sc == NULL || !ISSET(sc->sc_if.if_flags, IFF_RUNNING)) return; if (ISSET(st->state_flags, PFSTATE_ACK)) pfsync_deferred(st, 1); if (ISSET(st->state_flags, PFSTATE_NOSYNC)) { if (st->sync_state != PFSYNC_S_NONE) pfsync_q_del(st); return; } if (sc->sc_len == PFSYNC_MINPKT) timeout_add_sec(&sc->sc_tmo, 1); switch (st->sync_state) { case PFSYNC_S_INS: /* we never got to tell the world so just forget about it */ pfsync_q_del(st); return; case PFSYNC_S_UPD_C: case PFSYNC_S_UPD: case PFSYNC_S_IACK: pfsync_q_del(st); /* FALLTHROUGH to putting it on the del list */ case PFSYNC_S_NONE: pfsync_q_ins(st, PFSYNC_S_DEL); return; default: panic("pfsync_delete_state: unexpected sync state %d", st->sync_state); } } void pfsync_clear_states(u_int32_t creatorid, const char *ifname) { struct pfsync_softc *sc = pfsyncif; struct { struct pfsync_subheader subh; struct pfsync_clr clr; } __packed r; splsoftassert(IPL_SOFTNET); if (sc == NULL || !ISSET(sc->sc_if.if_flags, IFF_RUNNING)) return; bzero(&r, sizeof(r)); r.subh.action = PFSYNC_ACT_CLR; r.subh.count = htons(1); strlcpy(r.clr.ifname, ifname, sizeof(r.clr.ifname)); r.clr.creatorid = creatorid; pfsync_send_plus(&r, sizeof(r)); } void pfsync_q_ins(struct pf_state *st, int q) { struct pfsync_softc *sc = pfsyncif; size_t nlen = pfsync_qs[q].len; KASSERT(st->sync_state == PFSYNC_S_NONE); #if 1 || defined(PFSYNC_DEBUG) if (sc->sc_len < PFSYNC_MINPKT) panic("pfsync pkt len is too low %d", sc->sc_len); #endif if (TAILQ_EMPTY(&sc->sc_qs[q])) nlen += sizeof(struct pfsync_subheader); if (sc->sc_len + nlen > sc->sc_if.if_mtu) { pfsync_sendout(); nlen = sizeof(struct pfsync_subheader) + pfsync_qs[q].len; } sc->sc_len += nlen; TAILQ_INSERT_TAIL(&sc->sc_qs[q], st, sync_list); st->sync_state = q; } void pfsync_q_del(struct pf_state *st) { struct pfsync_softc *sc = pfsyncif; int q = st->sync_state; KASSERT(st->sync_state != PFSYNC_S_NONE); sc->sc_len -= pfsync_qs[q].len; TAILQ_REMOVE(&sc->sc_qs[q], st, sync_list); st->sync_state = PFSYNC_S_NONE; if (TAILQ_EMPTY(&sc->sc_qs[q])) sc->sc_len -= sizeof(struct pfsync_subheader); } void pfsync_update_tdb(struct tdb *t, int output) { struct pfsync_softc *sc = pfsyncif; size_t nlen = sizeof(struct pfsync_tdb); if (sc == NULL) return; if (!ISSET(t->tdb_flags, TDBF_PFSYNC)) { if (TAILQ_EMPTY(&sc->sc_tdb_q)) nlen += sizeof(struct pfsync_subheader); if (sc->sc_len + nlen > sc->sc_if.if_mtu) { pfsync_sendout(); nlen = sizeof(struct pfsync_subheader) + sizeof(struct pfsync_tdb); } sc->sc_len += nlen; TAILQ_INSERT_TAIL(&sc->sc_tdb_q, t, tdb_sync_entry); SET(t->tdb_flags, TDBF_PFSYNC); t->tdb_updates = 0; } else { if (++t->tdb_updates >= sc->sc_maxupdates) schednetisr(NETISR_PFSYNC); } if (output) SET(t->tdb_flags, TDBF_PFSYNC_RPL); else CLR(t->tdb_flags, TDBF_PFSYNC_RPL); } void pfsync_delete_tdb(struct tdb *t) { struct pfsync_softc *sc = pfsyncif; if (sc == NULL || !ISSET(t->tdb_flags, TDBF_PFSYNC)) return; sc->sc_len -= sizeof(struct pfsync_tdb); TAILQ_REMOVE(&sc->sc_tdb_q, t, tdb_sync_entry); CLR(t->tdb_flags, TDBF_PFSYNC); if (TAILQ_EMPTY(&sc->sc_tdb_q)) sc->sc_len -= sizeof(struct pfsync_subheader); } void pfsync_out_tdb(struct tdb *t, void *buf) { struct pfsync_tdb *ut = buf; bzero(ut, sizeof(*ut)); ut->spi = t->tdb_spi; bcopy(&t->tdb_dst, &ut->dst, sizeof(ut->dst)); /* * When a failover happens, the master's rpl is probably above * what we see here (we may be up to a second late), so * increase it a bit for outbound tdbs to manage most such * situations. * * For now, just add an offset that is likely to be larger * than the number of packets we can see in one second. The RFC * just says the next packet must have a higher seq value. * * XXX What is a good algorithm for this? We could use * a rate-determined increase, but to know it, we would have * to extend struct tdb. * XXX pt->rpl can wrap over MAXINT, but if so the real tdb * will soon be replaced anyway. For now, just don't handle * this edge case. */ #define RPL_INCR 16384 ut->rpl = htonl(t->tdb_rpl + (ISSET(t->tdb_flags, TDBF_PFSYNC_RPL) ? RPL_INCR : 0)); ut->cur_bytes = htobe64(t->tdb_cur_bytes); ut->sproto = t->tdb_sproto; } void pfsync_bulk_start(void) { struct pfsync_softc *sc = pfsyncif; sc->sc_ureq_received = time_uptime; if (sc->sc_bulk_next == NULL) sc->sc_bulk_next = TAILQ_FIRST(&state_list); sc->sc_bulk_last = sc->sc_bulk_next; if (pf_status.debug >= PF_DEBUG_MISC) printf("pfsync: received bulk update request\n"); pfsync_bulk_status(PFSYNC_BUS_START); timeout_add(&sc->sc_bulk_tmo, 0); } void pfsync_bulk_update(void *arg) { struct pfsync_softc *sc = arg; struct pf_state *st; int i = 0; int s; s = splsoftnet(); st = sc->sc_bulk_next; while (st != sc->sc_bulk_last) { if (st->sync_state == PFSYNC_S_NONE && st->timeout < PFTM_MAX && st->pfsync_time <= sc->sc_ureq_received) { pfsync_update_state_req(st); i++; } st = TAILQ_NEXT(st, entry_list); if (st == NULL) st = TAILQ_FIRST(&state_list); if (i > 0 && TAILQ_EMPTY(&sc->sc_qs[PFSYNC_S_UPD])) { sc->sc_bulk_next = st; timeout_add(&sc->sc_bulk_tmo, 1); goto out; } } /* we're done */ sc->sc_bulk_next = NULL; sc->sc_bulk_last = NULL; pfsync_bulk_status(PFSYNC_BUS_END); out: splx(s); } void pfsync_bulk_status(u_int8_t status) { struct { struct pfsync_subheader subh; struct pfsync_bus bus; } __packed r; struct pfsync_softc *sc = pfsyncif; bzero(&r, sizeof(r)); r.subh.action = PFSYNC_ACT_BUS; r.subh.count = htons(1); r.bus.creatorid = pf_status.hostid; r.bus.endtime = htonl(time_uptime - sc->sc_ureq_received); r.bus.status = status; pfsync_send_plus(&r, sizeof(r)); } void pfsync_bulk_fail(void *arg) { struct pfsync_softc *sc = arg; if (sc->sc_bulk_tries++ < PFSYNC_MAX_BULKTRIES) { /* Try again */ timeout_add_sec(&sc->sc_bulkfail_tmo, 5); pfsync_request_update(0, 0); } else { /* Pretend like the transfer was ok */ sc->sc_ureq_sent = 0; sc->sc_bulk_tries = 0; #if NCARP > 0 if (!pfsync_sync_ok) carp_group_demote_adj(&sc->sc_if, -1); #endif pfsync_sync_ok = 1; if (pf_status.debug >= PF_DEBUG_MISC) printf("pfsync: failed to receive bulk update\n"); } } void pfsync_send_plus(void *plus, size_t pluslen) { struct pfsync_softc *sc = pfsyncif; if (sc->sc_len + pluslen > sc->sc_if.if_mtu) pfsync_sendout(); sc->sc_plus = plus; sc->sc_len += (sc->sc_pluslen = pluslen); pfsync_sendout(); } int pfsync_up(void) { struct pfsync_softc *sc = pfsyncif; if (sc == NULL || !ISSET(sc->sc_if.if_flags, IFF_RUNNING)) return (0); return (1); } int pfsync_state_in_use(struct pf_state *st) { struct pfsync_softc *sc = pfsyncif; if (sc == NULL) return (0); if (st->sync_state != PFSYNC_S_NONE) return (1); if (sc->sc_bulk_next == NULL && sc->sc_bulk_last == NULL) return (0); return (1); } void pfsync_timeout(void *arg) { int s; s = splsoftnet(); pfsync_sendout(); splx(s); } /* this is a softnet/netisr handler */ void pfsyncintr(void) { pfsync_sendout(); } int pfsync_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, size_t newlen) { /* All sysctl names at this level are terminal. */ if (namelen != 1) return (ENOTDIR); switch (name[0]) { case PFSYNCCTL_STATS: if (newp != NULL) return (EPERM); return (sysctl_struct(oldp, oldlenp, newp, newlen, &pfsyncstats, sizeof(pfsyncstats))); default: return (ENOPROTOOPT); } }