/* $OpenBSD: if_bridge.c,v 1.291 2017/01/11 08:47:48 mpi Exp $ */ /* * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net) * 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 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 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. * * Effort sponsored in part by the Defense Advanced Research Projects * Agency (DARPA) and Air Force Research Laboratory, Air Force * Materiel Command, USAF, under agreement number F30602-01-2-0537. * */ #include "bpfilter.h" #include "gif.h" #include "pf.h" #include "carp.h" #include "vlan.h" #include "mpw.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef IPSEC #include #include #endif #ifdef INET6 #include #include #include #endif #if NPF > 0 #include #define BRIDGE_IN PF_IN #define BRIDGE_OUT PF_OUT #else #define BRIDGE_IN 0 #define BRIDGE_OUT 1 #endif #if NBPFILTER > 0 #include #endif #if NCARP > 0 #include #endif #if NVLAN > 0 #include #endif #include /* * Maximum number of addresses to cache */ #ifndef BRIDGE_RTABLE_MAX #define BRIDGE_RTABLE_MAX 100 #endif /* * Timeout (in seconds) for entries learned dynamically */ #ifndef BRIDGE_RTABLE_TIMEOUT #define BRIDGE_RTABLE_TIMEOUT 240 #endif void bridgeattach(int); int bridge_ioctl(struct ifnet *, u_long, caddr_t); void bridge_ifdetach(void *); void bridge_spandetach(void *); int bridge_input(struct ifnet *, struct mbuf *, void *); void bridge_process(struct ifnet *, struct mbuf *); void bridgeintr_frame(struct bridge_softc *, struct ifnet *, struct mbuf *); void bridge_broadcast(struct bridge_softc *, struct ifnet *, struct ether_header *, struct mbuf *); void bridge_localbroadcast(struct bridge_softc *, struct ifnet *, struct ether_header *, struct mbuf *); void bridge_span(struct bridge_softc *, struct mbuf *); void bridge_stop(struct bridge_softc *); void bridge_init(struct bridge_softc *); int bridge_bifconf(struct bridge_softc *, struct ifbifconf *); int bridge_blocknonip(struct ether_header *, struct mbuf *); void bridge_ifinput(struct ifnet *, struct mbuf *); int bridge_dummy_output(struct ifnet *, struct mbuf *, struct sockaddr *, struct rtentry *); #ifdef IPSEC int bridge_ipsec(struct bridge_softc *, struct ifnet *, struct ether_header *, int, struct llc *, int, int, int, struct mbuf *); #endif int bridge_clone_create(struct if_clone *, int); int bridge_clone_destroy(struct ifnet *ifp); int bridge_delete(struct bridge_softc *, struct bridge_iflist *); #define ETHERADDR_IS_IP_MCAST(a) \ /* struct etheraddr *a; */ \ ((a)->ether_addr_octet[0] == 0x01 && \ (a)->ether_addr_octet[1] == 0x00 && \ (a)->ether_addr_octet[2] == 0x5e) struct niqueue bridgeintrq = NIQUEUE_INITIALIZER(1024, NETISR_BRIDGE); struct if_clone bridge_cloner = IF_CLONE_INITIALIZER("bridge", bridge_clone_create, bridge_clone_destroy); void bridgeattach(int n) { if_clone_attach(&bridge_cloner); } int bridge_clone_create(struct if_clone *ifc, int unit) { struct bridge_softc *sc; struct ifnet *ifp; int i; sc = malloc(sizeof(*sc), M_DEVBUF, M_NOWAIT|M_ZERO); if (!sc) return (ENOMEM); sc->sc_stp = bstp_create(&sc->sc_if); if (!sc->sc_stp) { free(sc, M_DEVBUF, sizeof *sc); return (ENOMEM); } sc->sc_brtmax = BRIDGE_RTABLE_MAX; sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; timeout_set(&sc->sc_brtimeout, bridge_rtage, sc); TAILQ_INIT(&sc->sc_iflist); TAILQ_INIT(&sc->sc_spanlist); for (i = 0; i < BRIDGE_RTABLE_SIZE; i++) LIST_INIT(&sc->sc_rts[i]); arc4random_buf(&sc->sc_hashkey, sizeof(sc->sc_hashkey)); ifp = &sc->sc_if; snprintf(ifp->if_xname, sizeof ifp->if_xname, "%s%d", ifc->ifc_name, unit); ifp->if_softc = sc; ifp->if_mtu = ETHERMTU; ifp->if_ioctl = bridge_ioctl; ifp->if_output = bridge_dummy_output; ifp->if_start = NULL; ifp->if_type = IFT_BRIDGE; ifp->if_hdrlen = ETHER_HDR_LEN; if_attach(ifp); if_alloc_sadl(ifp); #if NBPFILTER > 0 bpfattach(&sc->sc_if.if_bpf, ifp, DLT_EN10MB, ETHER_HDR_LEN); #endif if_ih_insert(ifp, ether_input, NULL); return (0); } int bridge_dummy_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, struct rtentry *rt) { m_freem(m); return (EAFNOSUPPORT); } int bridge_clone_destroy(struct ifnet *ifp) { struct bridge_softc *sc = ifp->if_softc; struct bridge_iflist *bif; bridge_stop(sc); bridge_rtflush(sc, IFBF_FLUSHALL); while ((bif = TAILQ_FIRST(&sc->sc_iflist)) != NULL) bridge_delete(sc, bif); while ((bif = TAILQ_FIRST(&sc->sc_spanlist)) != NULL) bridge_spandetach(bif); bstp_destroy(sc->sc_stp); /* Undo pseudo-driver changes. */ if_deactivate(ifp); if_ih_remove(ifp, ether_input, NULL); KASSERT(SRPL_EMPTY_LOCKED(&ifp->if_inputs)); if_detach(ifp); free(sc, M_DEVBUF, sizeof *sc); return (0); } int bridge_delete(struct bridge_softc *sc, struct bridge_iflist *p) { int error; if (p->bif_flags & IFBIF_STP) bstp_delete(p->bif_stp); p->ifp->if_bridgeport = NULL; error = ifpromisc(p->ifp, 0); hook_disestablish(p->ifp->if_detachhooks, p->bif_dhcookie); if_ih_remove(p->ifp, bridge_input, NULL); TAILQ_REMOVE(&sc->sc_iflist, p, next); bridge_rtdelete(sc, p->ifp, 0); bridge_flushrule(p); free(p, M_DEVBUF, sizeof *p); return (error); } int bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) { struct bridge_softc *sc = (struct bridge_softc *)ifp->if_softc; struct ifbreq *req = (struct ifbreq *)data; struct ifbropreq *brop = (struct ifbropreq *)data; struct ifnet *ifs; struct bridge_iflist *p; struct bstp_port *bp; struct bstp_state *bs = sc->sc_stp; int error = 0, s; s = splnet(); switch (cmd) { case SIOCBRDGADD: /* bridge(4) does not distinguish between routing/forwarding ports */ case SIOCBRDGADDL: if ((error = suser(curproc, 0)) != 0) break; ifs = ifunit(req->ifbr_ifsname); if (ifs == NULL) { /* no such interface */ error = ENOENT; break; } if (ifs->if_bridgeport != NULL) { p = (struct bridge_iflist *)ifs->if_bridgeport; if (p->bridge_sc == sc) error = EEXIST; else error = EBUSY; break; } /* If it's in the span list, it can't be a member. */ TAILQ_FOREACH(p, &sc->sc_spanlist, next) if (p->ifp == ifs) break; if (p != NULL) { error = EBUSY; break; } if (ifs->if_type == IFT_ETHER) { if ((ifs->if_flags & IFF_UP) == 0) { struct ifreq ifreq; /* * Bring interface up long enough to set * promiscuous flag, then shut it down again. */ strlcpy(ifreq.ifr_name, req->ifbr_ifsname, IFNAMSIZ); ifs->if_flags |= IFF_UP; ifreq.ifr_flags = ifs->if_flags; error = (*ifs->if_ioctl)(ifs, SIOCSIFFLAGS, (caddr_t)&ifreq); if (error != 0) break; error = ifpromisc(ifs, 1); if (error != 0) break; strlcpy(ifreq.ifr_name, req->ifbr_ifsname, IFNAMSIZ); ifs->if_flags &= ~IFF_UP; ifreq.ifr_flags = ifs->if_flags; error = (*ifs->if_ioctl)(ifs, SIOCSIFFLAGS, (caddr_t)&ifreq); if (error != 0) { ifpromisc(ifs, 0); break; } } else { error = ifpromisc(ifs, 1); if (error != 0) break; } } #if NMPW > 0 else if (ifs->if_type == IFT_MPLSTUNNEL) { /* Nothing needed */ } #endif /* NMPW */ else { error = EINVAL; break; } p = malloc(sizeof(*p), M_DEVBUF, M_NOWAIT|M_ZERO); if (p == NULL) { if (ifs->if_type == IFT_ETHER) ifpromisc(ifs, 0); error = ENOMEM; break; } p->bridge_sc = sc; p->ifp = ifs; p->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; SIMPLEQ_INIT(&p->bif_brlin); SIMPLEQ_INIT(&p->bif_brlout); ifs->if_bridgeport = (caddr_t)p; p->bif_dhcookie = hook_establish(ifs->if_detachhooks, 0, bridge_ifdetach, ifs); if_ih_insert(p->ifp, bridge_input, NULL); TAILQ_INSERT_TAIL(&sc->sc_iflist, p, next); break; case SIOCBRDGDEL: if ((error = suser(curproc, 0)) != 0) break; ifs = ifunit(req->ifbr_ifsname); if (ifs == NULL) { error = ENOENT; break; } p = (struct bridge_iflist *)ifs->if_bridgeport; if (p == NULL || p->bridge_sc != sc) { error = ESRCH; break; } error = bridge_delete(sc, p); break; case SIOCBRDGIFS: error = bridge_bifconf(sc, (struct ifbifconf *)data); break; case SIOCBRDGADDS: if ((error = suser(curproc, 0)) != 0) break; ifs = ifunit(req->ifbr_ifsname); if (ifs == NULL) { /* no such interface */ error = ENOENT; break; } if (ifs->if_bridgeport != NULL) { error = EBUSY; break; } TAILQ_FOREACH(p, &sc->sc_spanlist, next) { if (p->ifp == ifs) break; } if (p != NULL) { error = EEXIST; break; } p = malloc(sizeof(*p), M_DEVBUF, M_NOWAIT|M_ZERO); if (p == NULL) { error = ENOMEM; break; } p->ifp = ifs; p->bif_flags = IFBIF_SPAN; p->bridge_sc = sc; p->bif_dhcookie = hook_establish(ifs->if_detachhooks, 0, bridge_spandetach, p); SIMPLEQ_INIT(&p->bif_brlin); SIMPLEQ_INIT(&p->bif_brlout); TAILQ_INSERT_TAIL(&sc->sc_spanlist, p, next); break; case SIOCBRDGDELS: if ((error = suser(curproc, 0)) != 0) break; TAILQ_FOREACH(p, &sc->sc_spanlist, next) { if (strncmp(p->ifp->if_xname, req->ifbr_ifsname, sizeof(p->ifp->if_xname)) == 0) { bridge_spandetach(p); break; } } if (p == NULL) { error = ENOENT; break; } break; case SIOCBRDGGIFFLGS: ifs = ifunit(req->ifbr_ifsname); if (ifs == NULL) { error = ENOENT; break; } p = (struct bridge_iflist *)ifs->if_bridgeport; if (p == NULL || p->bridge_sc != sc) { error = ESRCH; break; } req->ifbr_ifsflags = p->bif_flags; req->ifbr_portno = p->ifp->if_index & 0xfff; if (p->bif_flags & IFBIF_STP) { bp = p->bif_stp; req->ifbr_state = bstp_getstate(bs, bp); req->ifbr_priority = bp->bp_priority; req->ifbr_path_cost = bp->bp_path_cost; req->ifbr_proto = bp->bp_protover; req->ifbr_role = bp->bp_role; req->ifbr_stpflags = bp->bp_flags; req->ifbr_fwd_trans = bp->bp_forward_transitions; req->ifbr_desg_bridge = bp->bp_desg_pv.pv_dbridge_id; req->ifbr_desg_port = bp->bp_desg_pv.pv_dport_id; req->ifbr_root_bridge = bp->bp_desg_pv.pv_root_id; req->ifbr_root_cost = bp->bp_desg_pv.pv_cost; req->ifbr_root_port = bp->bp_desg_pv.pv_port_id; /* Copy STP state options as flags */ if (bp->bp_operedge) req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; if (bp->bp_flags & BSTP_PORT_AUTOEDGE) req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; if (bp->bp_ptp_link) req->ifbr_ifsflags |= IFBIF_BSTP_PTP; if (bp->bp_flags & BSTP_PORT_AUTOPTP) req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; } break; case SIOCBRDGSIFFLGS: if ((error = suser(curproc, 0)) != 0) break; ifs = ifunit(req->ifbr_ifsname); if (ifs == NULL) { error = ENOENT; break; } p = (struct bridge_iflist *)ifs->if_bridgeport; if (p == NULL || p->bridge_sc != sc) { error = ESRCH; break; } if (req->ifbr_ifsflags & IFBIF_RO_MASK) { error = EINVAL; break; } if (req->ifbr_ifsflags & IFBIF_STP) { if ((p->bif_flags & IFBIF_STP) == 0) { /* Enable STP */ if ((p->bif_stp = bstp_add(sc->sc_stp, p->ifp)) == NULL) { error = ENOMEM; break; } } else { /* Update STP flags */ bstp_ifsflags(p->bif_stp, req->ifbr_ifsflags); } } else if (p->bif_flags & IFBIF_STP) { bstp_delete(p->bif_stp); p->bif_stp = NULL; } p->bif_flags = req->ifbr_ifsflags; break; case SIOCSIFFLAGS: if ((ifp->if_flags & IFF_UP) == IFF_UP) bridge_init(sc); if ((ifp->if_flags & IFF_UP) == 0) bridge_stop(sc); break; case SIOCBRDGGPARAM: if ((bp = bs->bs_root_port) == NULL) brop->ifbop_root_port = 0; else brop->ifbop_root_port = bp->bp_ifp->if_index; brop->ifbop_maxage = bs->bs_bridge_max_age >> 8; brop->ifbop_hellotime = bs->bs_bridge_htime >> 8; brop->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; brop->ifbop_holdcount = bs->bs_txholdcount; brop->ifbop_priority = bs->bs_bridge_priority; brop->ifbop_protocol = bs->bs_protover; brop->ifbop_root_bridge = bs->bs_root_pv.pv_root_id; brop->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; brop->ifbop_root_port = bs->bs_root_pv.pv_port_id; brop->ifbop_desg_bridge = bs->bs_root_pv.pv_dbridge_id; brop->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; brop->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; break; case SIOCBRDGRTS: case SIOCBRDGGCACHE: case SIOCBRDGGPRI: case SIOCBRDGGMA: case SIOCBRDGGHT: case SIOCBRDGGFD: case SIOCBRDGGTO: case SIOCBRDGGRL: break; case SIOCBRDGFLUSH: case SIOCBRDGSADDR: case SIOCBRDGDADDR: case SIOCBRDGSCACHE: case SIOCBRDGSTO: case SIOCBRDGARL: case SIOCBRDGFRL: case SIOCBRDGSPRI: case SIOCBRDGSFD: case SIOCBRDGSMA: case SIOCBRDGSHT: case SIOCBRDGSTXHC: case SIOCBRDGSPROTO: case SIOCBRDGSIFPRIO: case SIOCBRDGSIFCOST: error = suser(curproc, 0); break; default: error = ENOTTY; break; } if (!error) error = bridgectl_ioctl(ifp, cmd, data); if (!error) error = bstp_ioctl(ifp, cmd, data); splx(s); return (error); } /* Detach an interface from a bridge. */ void bridge_ifdetach(void *arg) { struct ifnet *ifp = (struct ifnet *)arg; struct bridge_softc *sc; struct bridge_iflist *bif; bif = (struct bridge_iflist *)ifp->if_bridgeport; sc = bif->bridge_sc; bridge_delete(sc, bif); } void bridge_spandetach(void *arg) { struct bridge_iflist *p = (struct bridge_iflist *)arg; struct bridge_softc *sc = p->bridge_sc; hook_disestablish(p->ifp->if_detachhooks, p->bif_dhcookie); TAILQ_REMOVE(&sc->sc_spanlist, p, next); free(p, M_DEVBUF, sizeof(*p)); } int bridge_bifconf(struct bridge_softc *sc, struct ifbifconf *bifc) { struct bridge_iflist *p; struct bstp_port *bp; struct bstp_state *bs = sc->sc_stp; u_int32_t total = 0, i = 0; int error = 0; struct ifbreq *breq = NULL; TAILQ_FOREACH(p, &sc->sc_iflist, next) total++; TAILQ_FOREACH(p, &sc->sc_spanlist, next) total++; if (bifc->ifbic_len == 0) { i = total; goto done; } if ((breq = (struct ifbreq *) malloc(sizeof(*breq), M_DEVBUF, M_NOWAIT)) == NULL) goto done; TAILQ_FOREACH(p, &sc->sc_iflist, next) { bzero(breq, sizeof(*breq)); if (bifc->ifbic_len < sizeof(*breq)) break; strlcpy(breq->ifbr_name, sc->sc_if.if_xname, IFNAMSIZ); strlcpy(breq->ifbr_ifsname, p->ifp->if_xname, IFNAMSIZ); breq->ifbr_ifsflags = p->bif_flags; breq->ifbr_portno = p->ifp->if_index & 0xfff; if (p->bif_flags & IFBIF_STP) { bp = p->bif_stp; breq->ifbr_state = bstp_getstate(sc->sc_stp, bp); breq->ifbr_priority = bp->bp_priority; breq->ifbr_path_cost = bp->bp_path_cost; breq->ifbr_proto = bp->bp_protover; breq->ifbr_role = bp->bp_role; breq->ifbr_stpflags = bp->bp_flags; breq->ifbr_fwd_trans = bp->bp_forward_transitions; breq->ifbr_root_bridge = bs->bs_root_pv.pv_root_id; breq->ifbr_root_cost = bs->bs_root_pv.pv_cost; breq->ifbr_root_port = bs->bs_root_pv.pv_port_id; breq->ifbr_desg_bridge = bs->bs_root_pv.pv_dbridge_id; breq->ifbr_desg_port = bs->bs_root_pv.pv_dport_id; /* Copy STP state options as flags */ if (bp->bp_operedge) breq->ifbr_ifsflags |= IFBIF_BSTP_EDGE; if (bp->bp_flags & BSTP_PORT_AUTOEDGE) breq->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; if (bp->bp_ptp_link) breq->ifbr_ifsflags |= IFBIF_BSTP_PTP; if (bp->bp_flags & BSTP_PORT_AUTOPTP) breq->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; } error = copyout((caddr_t)breq, (caddr_t)(bifc->ifbic_req + i), sizeof(*breq)); if (error) goto done; i++; bifc->ifbic_len -= sizeof(*breq); } TAILQ_FOREACH(p, &sc->sc_spanlist, next) { bzero(breq, sizeof(*breq)); if (bifc->ifbic_len < sizeof(*breq)) break; strlcpy(breq->ifbr_name, sc->sc_if.if_xname, IFNAMSIZ); strlcpy(breq->ifbr_ifsname, p->ifp->if_xname, IFNAMSIZ); breq->ifbr_ifsflags = p->bif_flags | IFBIF_SPAN; breq->ifbr_portno = p->ifp->if_index & 0xfff; error = copyout((caddr_t)breq, (caddr_t)(bifc->ifbic_req + i), sizeof(*breq)); if (error) goto done; i++; bifc->ifbic_len -= sizeof(*breq); } done: if (breq != NULL) free(breq, M_DEVBUF, sizeof *breq); bifc->ifbic_len = i * sizeof(*breq); return (error); } void bridge_init(struct bridge_softc *sc) { struct ifnet *ifp = &sc->sc_if; if ((ifp->if_flags & IFF_RUNNING) == IFF_RUNNING) return; ifp->if_flags |= IFF_RUNNING; bstp_initialization(sc->sc_stp); if (sc->sc_brttimeout != 0) timeout_add_sec(&sc->sc_brtimeout, sc->sc_brttimeout); } /* * Stop the bridge and deallocate the routing table. */ void bridge_stop(struct bridge_softc *sc) { struct ifnet *ifp = &sc->sc_if; /* * If we're not running, there's nothing to do. */ if ((ifp->if_flags & IFF_RUNNING) == 0) return; timeout_del(&sc->sc_brtimeout); bridge_rtflush(sc, IFBF_FLUSHDYN); ifp->if_flags &= ~IFF_RUNNING; } /* * Send output from the bridge. The mbuf has the ethernet header * already attached. We must enqueue or free the mbuf before exiting. */ int bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, struct rtentry *rt) { struct ether_header *eh; struct ifnet *dst_if = NULL; struct bridge_rtnode *dst_p = NULL; struct ether_addr *dst; struct bridge_softc *sc; struct bridge_tunneltag *brtag; int error; /* ifp must be a member interface of the bridge. */ if (ifp->if_bridgeport == NULL) { m_freem(m); return (EINVAL); } sc = ((struct bridge_iflist *)ifp->if_bridgeport)->bridge_sc; if (m->m_len < sizeof(*eh)) { m = m_pullup(m, sizeof(*eh)); if (m == NULL) return (ENOBUFS); } eh = mtod(m, struct ether_header *); dst = (struct ether_addr *)&eh->ether_dhost[0]; /* * If bridge is down, but original output interface is up, * go ahead and send out that interface. Otherwise the packet * is dropped below. */ if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) { dst_if = ifp; goto sendunicast; } #if NBPFILTER > 0 if (sc->sc_if.if_bpf) bpf_mtap(sc->sc_if.if_bpf, m, BPF_DIRECTION_OUT); #endif ifp->if_opackets++; ifp->if_obytes += m->m_pkthdr.len; /* * If the packet is a broadcast or we don't know a better way to * get there, send to all interfaces. */ if ((dst_p = bridge_rtlookup(sc, dst)) != NULL) dst_if = dst_p->brt_if; if (dst_if == NULL || ETHER_IS_MULTICAST(eh->ether_dhost)) { struct bridge_iflist *p; struct mbuf *mc; int used = 0; bridge_span(sc, m); TAILQ_FOREACH(p, &sc->sc_iflist, next) { dst_if = p->ifp; if ((dst_if->if_flags & IFF_RUNNING) == 0) continue; /* * If this is not the original output interface, * and the interface is participating in spanning * tree, make sure the port is in a state that * allows forwarding. */ if (dst_if != ifp && (p->bif_flags & IFBIF_STP) && (p->bif_state == BSTP_IFSTATE_DISCARDING)) continue; #if NMPW > 0 /* * Split horizon: avoid broadcasting messages from * wire to another wire. */ if (ifp->if_type == IFT_MPLSTUNNEL && dst_if->if_type == IFT_MPLSTUNNEL) continue; #endif /* NMPW */ if ((p->bif_flags & IFBIF_DISCOVER) == 0 && (m->m_flags & (M_BCAST | M_MCAST)) == 0) continue; if (TAILQ_NEXT(p, next) == NULL) { used = 1; mc = m; } else { mc = m_dup_pkt(m, ETHER_ALIGN, M_NOWAIT); if (mc == NULL) { sc->sc_if.if_oerrors++; continue; } } error = bridge_ifenqueue(sc, dst_if, mc); if (error) continue; } if (!used) m_freem(m); return (0); } sendunicast: if ((dst_p != NULL) && (dst_p->brt_tunnel.brtag_peer.sa.sa_family != AF_UNSPEC) && ((brtag = bridge_tunneltag(m)) != NULL)) bridge_copytag(&dst_p->brt_tunnel, brtag); bridge_span(sc, m); if ((dst_if->if_flags & IFF_RUNNING) == 0) { m_freem(m); return (ENETDOWN); } bridge_ifenqueue(sc, dst_if, m); return (0); } /* * Loop through each bridge interface and process their input queues. */ void bridgeintr(void) { struct mbuf_list ml; struct mbuf *m; struct ifnet *ifp; niq_delist(&bridgeintrq, &ml); if (ml_empty(&ml)) return; while ((m = ml_dequeue(&ml)) != NULL) { ifp = if_get(m->m_pkthdr.ph_ifidx); if (ifp == NULL) { m_freem(m); continue; } bridge_process(ifp, m); if_put(ifp); } } /* * Process a single frame. Frame must be freed or queued before returning. */ void bridgeintr_frame(struct bridge_softc *sc, struct ifnet *src_if, struct mbuf *m) { struct ifnet *dst_if; struct bridge_iflist *ifl; struct bridge_rtnode *dst_p; struct ether_addr *dst, *src; struct ether_header eh; int len; sc->sc_if.if_ipackets++; sc->sc_if.if_ibytes += m->m_pkthdr.len; ifl = (struct bridge_iflist *)src_if->if_bridgeport; KASSERT(ifl != NULL); if (m->m_pkthdr.len < sizeof(eh)) { m_freem(m); return; } m_copydata(m, 0, ETHER_HDR_LEN, (caddr_t)&eh); dst = (struct ether_addr *)&eh.ether_dhost[0]; src = (struct ether_addr *)&eh.ether_shost[0]; /* * If interface is learning, and if source address * is not broadcast or multicast, record its address. */ if ((ifl->bif_flags & IFBIF_LEARNING) && (eh.ether_shost[0] & 1) == 0 && !(eh.ether_shost[0] == 0 && eh.ether_shost[1] == 0 && eh.ether_shost[2] == 0 && eh.ether_shost[3] == 0 && eh.ether_shost[4] == 0 && eh.ether_shost[5] == 0)) bridge_rtupdate(sc, src, src_if, 0, IFBAF_DYNAMIC, m); if ((ifl->bif_flags & IFBIF_STP) && (ifl->bif_state == BSTP_IFSTATE_LEARNING)) { m_freem(m); return; } /* * At this point, the port either doesn't participate in stp or * it's in the forwarding state */ /* * If packet is unicast, destined for someone on "this" * side of the bridge, drop it. */ if (!ETHER_IS_MULTICAST(eh.ether_dhost)) { if ((dst_p = bridge_rtlookup(sc, dst)) != NULL) dst_if = dst_p->brt_if; else dst_if = NULL; if (dst_if == src_if) { m_freem(m); return; } } else { if (memcmp(etherbroadcastaddr, eh.ether_dhost, sizeof(etherbroadcastaddr)) == 0) m->m_flags |= M_BCAST; else m->m_flags |= M_MCAST; dst_if = NULL; } /* * Multicast packets get handled a little differently: * If interface is: * -link0,-link1 (default) Forward all multicast * as broadcast. * -link0,link1 Drop non-IP multicast, forward * as broadcast IP multicast. * link0,-link1 Drop IP multicast, forward as * broadcast non-IP multicast. * link0,link1 Drop all multicast. */ if (m->m_flags & M_MCAST) { if ((sc->sc_if.if_flags & (IFF_LINK0 | IFF_LINK1)) == (IFF_LINK0 | IFF_LINK1)) { m_freem(m); return; } if (sc->sc_if.if_flags & IFF_LINK0 && ETHERADDR_IS_IP_MCAST(dst)) { m_freem(m); return; } if (sc->sc_if.if_flags & IFF_LINK1 && !ETHERADDR_IS_IP_MCAST(dst)) { m_freem(m); return; } } if (ifl->bif_flags & IFBIF_BLOCKNONIP && bridge_blocknonip(&eh, m)) { m_freem(m); return; } if (bridge_filterrule(&ifl->bif_brlin, &eh, m) == BRL_ACTION_BLOCK) { m_freem(m); return; } m = bridge_ip(sc, BRIDGE_IN, src_if, &eh, m); if (m == NULL) return; /* * If the packet is a multicast or broadcast OR if we don't * know any better, forward it to all interfaces. */ if ((m->m_flags & (M_BCAST | M_MCAST)) || dst_if == NULL) { sc->sc_if.if_imcasts++; bridge_broadcast(sc, src_if, &eh, m); return; } /* * At this point, we're dealing with a unicast frame going to a * different interface */ if ((dst_if->if_flags & IFF_RUNNING) == 0) { m_freem(m); return; } ifl = (struct bridge_iflist *)dst_if->if_bridgeport; if ((ifl->bif_flags & IFBIF_STP) && (ifl->bif_state == BSTP_IFSTATE_DISCARDING)) { m_freem(m); return; } if (bridge_filterrule(&ifl->bif_brlout, &eh, m) == BRL_ACTION_BLOCK) { m_freem(m); return; } m = bridge_ip(sc, BRIDGE_OUT, dst_if, &eh, m); if (m == NULL) return; len = m->m_pkthdr.len; #if NVLAN > 0 if ((m->m_flags & M_VLANTAG) && (dst_if->if_capabilities & IFCAP_VLAN_HWTAGGING) == 0) len += ETHER_VLAN_ENCAP_LEN; #endif if ((len - ETHER_HDR_LEN) > dst_if->if_mtu) bridge_fragment(sc, dst_if, &eh, m); else { bridge_ifenqueue(sc, dst_if, m); } } /* * Receive input from an interface. Queue the packet for bridging if its * not for us, and schedule an interrupt. */ int bridge_input(struct ifnet *ifp, struct mbuf *m, void *cookie) { KASSERT(m->m_flags & M_PKTHDR); if (m->m_flags & M_PROTO1) { m->m_flags &= ~M_PROTO1; return (0); } niq_enqueue(&bridgeintrq, m); return (1); } void bridge_process(struct ifnet *ifp, struct mbuf *m) { struct bridge_softc *sc; struct bridge_iflist *ifl; struct bridge_iflist *srcifl; struct ether_header *eh; struct arpcom *ac; struct mbuf *mc; ifl = (struct bridge_iflist *)ifp->if_bridgeport; if (ifl == NULL) goto reenqueue; sc = ifl->bridge_sc; if ((sc->sc_if.if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) goto reenqueue; #if NVLAN > 0 /* * If the underlying interface removed the VLAN header itself, * add it back. */ if (ISSET(m->m_flags, M_VLANTAG)) { m = vlan_inject(m, ETHERTYPE_VLAN, m->m_pkthdr.ether_vtag); if (m == NULL) return; } #endif #if NBPFILTER > 0 if (sc->sc_if.if_bpf) bpf_mtap_ether(sc->sc_if.if_bpf, m, BPF_DIRECTION_IN); #endif bridge_span(sc, m); eh = mtod(m, struct ether_header *); if (ETHER_IS_MULTICAST(eh->ether_dhost)) { /* * Reserved destination MAC addresses (01:80:C2:00:00:0x) * should not be forwarded to bridge members according to * section 7.12.6 of the 802.1D-2004 specification. The * STP destination address (as stored in bstp_etheraddr) * is the first of these. */ if (bcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN - 1) == 0) { if (eh->ether_dhost[ETHER_ADDR_LEN - 1] == 0) { /* STP traffic */ if ((m = bstp_input(sc->sc_stp, ifl->bif_stp, eh, m)) == NULL) return; } else if (eh->ether_dhost[ETHER_ADDR_LEN - 1] <= 0xf) { m_freem(m); return; } } /* * No need to process frames for ifs in the discarding state */ if ((ifl->bif_flags & IFBIF_STP) && (ifl->bif_state == BSTP_IFSTATE_DISCARDING)) goto reenqueue; mc = m_dup_pkt(m, ETHER_ALIGN, M_NOWAIT); if (mc == NULL) goto reenqueue; bridge_ifinput(ifp, mc); bridgeintr_frame(sc, ifp, m); return; } /* * No need to queue frames for ifs in the discarding state */ if ((ifl->bif_flags & IFBIF_STP) && (ifl->bif_state == BSTP_IFSTATE_DISCARDING)) goto reenqueue; /* * Unicast, make sure it's not for us. */ srcifl = ifl; TAILQ_FOREACH(ifl, &sc->sc_iflist, next) { if (ifl->ifp->if_type != IFT_ETHER) continue; ac = (struct arpcom *)ifl->ifp; if (bcmp(ac->ac_enaddr, eh->ether_dhost, ETHER_ADDR_LEN) == 0 #if NCARP > 0 || (ifl->ifp->if_carp && carp_ourether(ifl->ifp->if_carp, (u_int8_t *)&eh->ether_dhost) != NULL) #endif ) { if (srcifl->bif_flags & IFBIF_LEARNING) bridge_rtupdate(sc, (struct ether_addr *)&eh->ether_shost, ifp, 0, IFBAF_DYNAMIC, m); if (bridge_filterrule(&srcifl->bif_brlin, eh, m) == BRL_ACTION_BLOCK) { m_freem(m); return; } /* Count for the bridge */ sc->sc_if.if_ipackets++; sc->sc_if.if_ibytes += m->m_pkthdr.len; bridge_ifinput(ifl->ifp, m); return; } if (bcmp(ac->ac_enaddr, eh->ether_shost, ETHER_ADDR_LEN) == 0 #if NCARP > 0 || (ifl->ifp->if_carp && carp_ourether(ifl->ifp->if_carp, (u_int8_t *)&eh->ether_shost) != NULL) #endif ) { m_freem(m); return; } } bridgeintr_frame(sc, ifp, m); return; reenqueue: bridge_ifinput(ifp, m); } /* * Send a frame to all interfaces that are members of the bridge * (except the one it came in on). */ void bridge_broadcast(struct bridge_softc *sc, struct ifnet *ifp, struct ether_header *eh, struct mbuf *m) { struct bridge_iflist *p; struct mbuf *mc; struct ifnet *dst_if; int len, used = 0; TAILQ_FOREACH(p, &sc->sc_iflist, next) { dst_if = p->ifp; if ((dst_if->if_flags & IFF_RUNNING) == 0) continue; if ((p->bif_flags & IFBIF_STP) && (p->bif_state == BSTP_IFSTATE_DISCARDING)) continue; if ((p->bif_flags & IFBIF_DISCOVER) == 0 && (m->m_flags & (M_BCAST | M_MCAST)) == 0) continue; /* Drop non-IP frames if the appropriate flag is set. */ if (p->bif_flags & IFBIF_BLOCKNONIP && bridge_blocknonip(eh, m)) continue; if (bridge_filterrule(&p->bif_brlout, eh, m) == BRL_ACTION_BLOCK) continue; /* * Don't retransmit out of the same interface where * the packet was received from. */ if (dst_if->if_index == ifp->if_index) continue; bridge_localbroadcast(sc, dst_if, eh, m); #if NMPW > 0 /* * Split horizon: avoid broadcasting messages from wire to * another wire. */ if (ifp->if_type == IFT_MPLSTUNNEL && dst_if->if_type == IFT_MPLSTUNNEL) continue; #endif /* NMPW */ /* If last one, reuse the passed-in mbuf */ if (TAILQ_NEXT(p, next) == NULL) { mc = m; used = 1; } else { mc = m_dup_pkt(m, ETHER_ALIGN, M_NOWAIT); if (mc == NULL) { sc->sc_if.if_oerrors++; continue; } } mc = bridge_ip(sc, BRIDGE_OUT, dst_if, eh, mc); if (mc == NULL) continue; len = mc->m_pkthdr.len; #if NVLAN > 0 if ((mc->m_flags & M_VLANTAG) && (dst_if->if_capabilities & IFCAP_VLAN_HWTAGGING) == 0) len += ETHER_VLAN_ENCAP_LEN; #endif if ((len - ETHER_HDR_LEN) > dst_if->if_mtu) bridge_fragment(sc, dst_if, eh, mc); else { bridge_ifenqueue(sc, dst_if, mc); } } if (!used) m_freem(m); } void bridge_localbroadcast(struct bridge_softc *sc, struct ifnet *ifp, struct ether_header *eh, struct mbuf *m) { struct mbuf *m1; u_int16_t etype; /* * quick optimisation, don't send packets up the stack if no * corresponding address has been specified. */ etype = ntohs(eh->ether_type); if (!(m->m_flags & M_VLANTAG) && etype == ETHERTYPE_IP) { struct ifaddr *ifa; TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { if (ifa->ifa_addr->sa_family == AF_INET) break; } if (ifa == NULL) return; } m1 = m_dup_pkt(m, ETHER_ALIGN, M_NOWAIT); if (m1 == NULL) { sc->sc_if.if_oerrors++; return; } #if NPF > 0 pf_pkt_addr_changed(m1); #endif /* NPF */ bridge_ifinput(ifp, m1); } void bridge_span(struct bridge_softc *sc, struct mbuf *m) { struct bridge_iflist *p; struct ifnet *ifp; struct mbuf *mc; int error; TAILQ_FOREACH(p, &sc->sc_spanlist, next) { ifp = p->ifp; if ((ifp->if_flags & IFF_RUNNING) == 0) continue; mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); if (mc == NULL) { sc->sc_if.if_oerrors++; continue; } error = bridge_ifenqueue(sc, ifp, mc); if (error) continue; } } /* * Block non-ip frames: * Returns 0 if frame is ip, and 1 if it should be dropped. */ int bridge_blocknonip(struct ether_header *eh, struct mbuf *m) { struct llc llc; u_int16_t etype; if (m->m_pkthdr.len < ETHER_HDR_LEN) return (1); #if NVLAN > 0 if (m->m_flags & M_VLANTAG) return (1); #endif etype = ntohs(eh->ether_type); switch (etype) { case ETHERTYPE_ARP: case ETHERTYPE_REVARP: case ETHERTYPE_IP: case ETHERTYPE_IPV6: return (0); } if (etype > ETHERMTU) return (1); if (m->m_pkthdr.len < (ETHER_HDR_LEN + LLC_SNAPFRAMELEN)) return (1); m_copydata(m, ETHER_HDR_LEN, LLC_SNAPFRAMELEN, (caddr_t)&llc); etype = ntohs(llc.llc_snap.ether_type); if (llc.llc_dsap == LLC_SNAP_LSAP && llc.llc_ssap == LLC_SNAP_LSAP && llc.llc_control == LLC_UI && llc.llc_snap.org_code[0] == 0 && llc.llc_snap.org_code[1] == 0 && llc.llc_snap.org_code[2] == 0 && (etype == ETHERTYPE_ARP || etype == ETHERTYPE_REVARP || etype == ETHERTYPE_IP || etype == ETHERTYPE_IPV6)) { return (0); } return (1); } #ifdef IPSEC int bridge_ipsec(struct bridge_softc *sc, struct ifnet *ifp, struct ether_header *eh, int hassnap, struct llc *llc, int dir, int af, int hlen, struct mbuf *m) { union sockaddr_union dst; struct tdb *tdb; u_int32_t spi; u_int16_t cpi; int error, off; u_int8_t proto = 0; struct ip *ip; #ifdef INET6 struct ip6_hdr *ip6; #endif /* INET6 */ #if NPF > 0 struct ifnet *encif; #endif if (dir == BRIDGE_IN) { switch (af) { case AF_INET: if (m->m_pkthdr.len - hlen < 2 * sizeof(u_int32_t)) break; ip = mtod(m, struct ip *); proto = ip->ip_p; off = offsetof(struct ip, ip_p); if (proto != IPPROTO_ESP && proto != IPPROTO_AH && proto != IPPROTO_IPCOMP) goto skiplookup; bzero(&dst, sizeof(union sockaddr_union)); dst.sa.sa_family = AF_INET; dst.sin.sin_len = sizeof(struct sockaddr_in); m_copydata(m, offsetof(struct ip, ip_dst), sizeof(struct in_addr), (caddr_t)&dst.sin.sin_addr); if (ip->ip_p == IPPROTO_ESP) m_copydata(m, hlen, sizeof(u_int32_t), (caddr_t)&spi); else if (ip->ip_p == IPPROTO_AH) m_copydata(m, hlen + sizeof(u_int32_t), sizeof(u_int32_t), (caddr_t)&spi); else if (ip->ip_p == IPPROTO_IPCOMP) { m_copydata(m, hlen + sizeof(u_int16_t), sizeof(u_int16_t), (caddr_t)&cpi); spi = ntohl(htons(cpi)); } break; #ifdef INET6 case AF_INET6: if (m->m_pkthdr.len - hlen < 2 * sizeof(u_int32_t)) break; ip6 = mtod(m, struct ip6_hdr *); /* XXX We should chase down the header chain */ proto = ip6->ip6_nxt; off = offsetof(struct ip6_hdr, ip6_nxt); if (proto != IPPROTO_ESP && proto != IPPROTO_AH && proto != IPPROTO_IPCOMP) goto skiplookup; bzero(&dst, sizeof(union sockaddr_union)); dst.sa.sa_family = AF_INET6; dst.sin6.sin6_len = sizeof(struct sockaddr_in6); m_copydata(m, offsetof(struct ip6_hdr, ip6_nxt), sizeof(struct in6_addr), (caddr_t)&dst.sin6.sin6_addr); if (proto == IPPROTO_ESP) m_copydata(m, hlen, sizeof(u_int32_t), (caddr_t)&spi); else if (proto == IPPROTO_AH) m_copydata(m, hlen + sizeof(u_int32_t), sizeof(u_int32_t), (caddr_t)&spi); else if (proto == IPPROTO_IPCOMP) { m_copydata(m, hlen + sizeof(u_int16_t), sizeof(u_int16_t), (caddr_t)&cpi); spi = ntohl(htons(cpi)); } break; #endif /* INET6 */ default: return (0); } if (proto == 0) goto skiplookup; splsoftassert(IPL_SOFTNET); tdb = gettdb(ifp->if_rdomain, spi, &dst, proto); if (tdb != NULL && (tdb->tdb_flags & TDBF_INVALID) == 0 && tdb->tdb_xform != NULL) { if (tdb->tdb_first_use == 0) { tdb->tdb_first_use = time_second; if (tdb->tdb_flags & TDBF_FIRSTUSE) timeout_add_sec(&tdb->tdb_first_tmo, tdb->tdb_exp_first_use); if (tdb->tdb_flags & TDBF_SOFT_FIRSTUSE) timeout_add_sec(&tdb->tdb_sfirst_tmo, tdb->tdb_soft_first_use); } (*(tdb->tdb_xform->xf_input))(m, tdb, hlen, off); return (1); } else { skiplookup: /* XXX do an input policy lookup */ return (0); } } else { /* Outgoing from the bridge. */ tdb = ipsp_spd_lookup(m, af, hlen, &error, IPSP_DIRECTION_OUT, NULL, NULL, 0); if (tdb != NULL) { /* * We don't need to do loop detection, the * bridge will do that for us. */ #if NPF > 0 if ((encif = enc_getif(tdb->tdb_rdomain, tdb->tdb_tap)) == NULL || pf_test(af, dir, encif, &m) != PF_PASS) { m_freem(m); return (1); } if (m == NULL) return (1); else if (af == AF_INET) in_proto_cksum_out(m, encif); #ifdef INET6 else if (af == AF_INET6) in6_proto_cksum_out(m, encif); #endif /* INET6 */ #endif /* NPF */ ip = mtod(m, struct ip *); if ((af == AF_INET) && ip_mtudisc && (ip->ip_off & htons(IP_DF)) && tdb->tdb_mtu && ntohs(ip->ip_len) > tdb->tdb_mtu && tdb->tdb_mtutimeout > time_second) bridge_send_icmp_err(sc, ifp, eh, m, hassnap, llc, tdb->tdb_mtu, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG); else error = ipsp_process_packet(m, tdb, af, 0); return (1); } else return (0); } return (0); } #endif /* IPSEC */ /* * Filter IP packets by peeking into the ethernet frame. This violates * the ISO model, but allows us to act as a IP filter at the data link * layer. As a result, most of this code will look familiar to those * who've read net/if_ethersubr.c and netinet/ip_input.c */ struct mbuf * bridge_ip(struct bridge_softc *sc, int dir, struct ifnet *ifp, struct ether_header *eh, struct mbuf *m) { struct llc llc; int hassnap = 0; struct ip *ip; int hlen; u_int16_t etype; #if NVLAN > 0 if (m->m_flags & M_VLANTAG) return (m); #endif etype = ntohs(eh->ether_type); if (etype != ETHERTYPE_IP && etype != ETHERTYPE_IPV6) { if (etype > ETHERMTU || m->m_pkthdr.len < (LLC_SNAPFRAMELEN + ETHER_HDR_LEN)) return (m); m_copydata(m, ETHER_HDR_LEN, LLC_SNAPFRAMELEN, (caddr_t)&llc); if (llc.llc_dsap != LLC_SNAP_LSAP || llc.llc_ssap != LLC_SNAP_LSAP || llc.llc_control != LLC_UI || llc.llc_snap.org_code[0] || llc.llc_snap.org_code[1] || llc.llc_snap.org_code[2]) return (m); etype = ntohs(llc.llc_snap.ether_type); if (etype != ETHERTYPE_IP && etype != ETHERTYPE_IPV6) return (m); hassnap = 1; } m_adj(m, ETHER_HDR_LEN); if (hassnap) m_adj(m, LLC_SNAPFRAMELEN); switch (etype) { case ETHERTYPE_IP: if (m->m_pkthdr.len < sizeof(struct ip)) goto dropit; /* Copy minimal header, and drop invalids */ if (m->m_len < sizeof(struct ip) && (m = m_pullup(m, sizeof(struct ip))) == NULL) { ipstat_inc(ips_toosmall); return (NULL); } ip = mtod(m, struct ip *); if (ip->ip_v != IPVERSION) { ipstat_inc(ips_badvers); goto dropit; } hlen = ip->ip_hl << 2; /* get whole header length */ if (hlen < sizeof(struct ip)) { ipstat_inc(ips_badhlen); goto dropit; } if (hlen > m->m_len) { if ((m = m_pullup(m, hlen)) == NULL) { ipstat_inc(ips_badhlen); return (NULL); } ip = mtod(m, struct ip *); } if ((m->m_pkthdr.csum_flags & M_IPV4_CSUM_IN_OK) == 0) { if (m->m_pkthdr.csum_flags & M_IPV4_CSUM_IN_BAD) { ipstat_inc(ips_badsum); goto dropit; } ipstat_inc(ips_inswcsum); if (in_cksum(m, hlen) != 0) { ipstat_inc(ips_badsum); goto dropit; } } if (ntohs(ip->ip_len) < hlen) goto dropit; if (m->m_pkthdr.len < ntohs(ip->ip_len)) goto dropit; if (m->m_pkthdr.len > ntohs(ip->ip_len)) { if (m->m_len == m->m_pkthdr.len) { m->m_len = ntohs(ip->ip_len); m->m_pkthdr.len = ntohs(ip->ip_len); } else m_adj(m, ntohs(ip->ip_len) - m->m_pkthdr.len); } #ifdef IPSEC if ((sc->sc_if.if_flags & IFF_LINK2) == IFF_LINK2 && bridge_ipsec(sc, ifp, eh, hassnap, &llc, dir, AF_INET, hlen, m)) return (NULL); #endif /* IPSEC */ #if NPF > 0 /* Finally, we get to filter the packet! */ if (pf_test(AF_INET, dir, ifp, &m) != PF_PASS) goto dropit; if (m == NULL) goto dropit; #endif /* NPF > 0 */ /* Rebuild the IP header */ if (m->m_len < hlen && ((m = m_pullup(m, hlen)) == NULL)) return (NULL); if (m->m_len < sizeof(struct ip)) goto dropit; in_proto_cksum_out(m, ifp); ip = mtod(m, struct ip *); ip->ip_sum = 0; if (0 && (ifp->if_capabilities & IFCAP_CSUM_IPv4)) m->m_pkthdr.csum_flags |= M_IPV4_CSUM_OUT; else { ipstat_inc(ips_outswcsum); ip->ip_sum = in_cksum(m, hlen); } break; #ifdef INET6 case ETHERTYPE_IPV6: { struct ip6_hdr *ip6; if (m->m_len < sizeof(struct ip6_hdr)) { if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { ip6stat.ip6s_toosmall++; return (NULL); } } ip6 = mtod(m, struct ip6_hdr *); if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { ip6stat.ip6s_badvers++; goto dropit; } #ifdef IPSEC hlen = sizeof(struct ip6_hdr); if ((sc->sc_if.if_flags & IFF_LINK2) == IFF_LINK2 && bridge_ipsec(sc, ifp, eh, hassnap, &llc, dir, AF_INET6, hlen, m)) return (NULL); #endif /* IPSEC */ #if NPF > 0 if (pf_test(AF_INET6, dir, ifp, &m) != PF_PASS) goto dropit; if (m == NULL) return (NULL); #endif /* NPF > 0 */ in6_proto_cksum_out(m, ifp); break; } #endif /* INET6 */ default: goto dropit; break; } /* Reattach SNAP header */ if (hassnap) { M_PREPEND(m, LLC_SNAPFRAMELEN, M_DONTWAIT); if (m == NULL) goto dropit; bcopy(&llc, mtod(m, caddr_t), LLC_SNAPFRAMELEN); } /* Reattach ethernet header */ M_PREPEND(m, sizeof(*eh), M_DONTWAIT); if (m == NULL) goto dropit; bcopy(eh, mtod(m, caddr_t), sizeof(*eh)); return (m); dropit: m_freem(m); return (NULL); } void bridge_fragment(struct bridge_softc *sc, struct ifnet *ifp, struct ether_header *eh, struct mbuf *m) { struct llc llc; struct mbuf *m0; int error = 0; int hassnap = 0; u_int16_t etype; struct ip *ip; etype = ntohs(eh->ether_type); #if NVLAN > 0 if ((m->m_flags & M_VLANTAG) || etype == ETHERTYPE_VLAN || etype == ETHERTYPE_QINQ) { int len = m->m_pkthdr.len; if (m->m_flags & M_VLANTAG) len += ETHER_VLAN_ENCAP_LEN; if ((ifp->if_capabilities & IFCAP_VLAN_MTU) && (len - sizeof(struct ether_vlan_header) <= ifp->if_mtu)) { bridge_ifenqueue(sc, ifp, m); return; } goto dropit; } #endif if (etype != ETHERTYPE_IP) { if (etype > ETHERMTU || m->m_pkthdr.len < (LLC_SNAPFRAMELEN + ETHER_HDR_LEN)) goto dropit; m_copydata(m, ETHER_HDR_LEN, LLC_SNAPFRAMELEN, (caddr_t)&llc); if (llc.llc_dsap != LLC_SNAP_LSAP || llc.llc_ssap != LLC_SNAP_LSAP || llc.llc_control != LLC_UI || llc.llc_snap.org_code[0] || llc.llc_snap.org_code[1] || llc.llc_snap.org_code[2] || llc.llc_snap.ether_type != htons(ETHERTYPE_IP)) goto dropit; hassnap = 1; } m_adj(m, ETHER_HDR_LEN); if (hassnap) m_adj(m, LLC_SNAPFRAMELEN); if (m->m_len < sizeof(struct ip) && (m = m_pullup(m, sizeof(struct ip))) == NULL) goto dropit; ip = mtod(m, struct ip *); /* Respect IP_DF, return a ICMP_UNREACH_NEEDFRAG. */ if (ip->ip_off & htons(IP_DF)) { bridge_send_icmp_err(sc, ifp, eh, m, hassnap, &llc, ifp->if_mtu, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG); return; } error = ip_fragment(m, ifp, ifp->if_mtu); if (error) { m = NULL; goto dropit; } for (; m; m = m0) { m0 = m->m_nextpkt; m->m_nextpkt = NULL; if (error == 0) { if (hassnap) { M_PREPEND(m, LLC_SNAPFRAMELEN, M_DONTWAIT); if (m == NULL) { error = ENOBUFS; continue; } bcopy(&llc, mtod(m, caddr_t), LLC_SNAPFRAMELEN); } M_PREPEND(m, sizeof(*eh), M_DONTWAIT); if (m == NULL) { error = ENOBUFS; continue; } bcopy(eh, mtod(m, caddr_t), sizeof(*eh)); error = bridge_ifenqueue(sc, ifp, m); if (error) { continue; } } else m_freem(m); } if (error == 0) ipstat_inc(ips_fragmented); return; dropit: m_freem(m); } int bridge_ifenqueue(struct bridge_softc *sc, struct ifnet *ifp, struct mbuf *m) { int error, len; /* Loop prevention. */ m->m_flags |= M_PROTO1; len = m->m_pkthdr.len; error = if_enqueue(ifp, m); if (error) { sc->sc_if.if_oerrors++; return (error); } sc->sc_if.if_opackets++; sc->sc_if.if_obytes += len; return (0); } void bridge_ifinput(struct ifnet *ifp, struct mbuf *m) { struct mbuf_list ml = MBUF_LIST_INITIALIZER(); m->m_flags |= M_PROTO1; ml_enqueue(&ml, m); if_input(ifp, &ml); } void bridge_send_icmp_err(struct bridge_softc *sc, struct ifnet *ifp, struct ether_header *eh, struct mbuf *n, int hassnap, struct llc *llc, int mtu, int type, int code) { struct ip *ip; struct icmp *icp; struct in_addr t; struct mbuf *m, *n2; int hlen; u_int8_t ether_tmp[ETHER_ADDR_LEN]; n2 = m_copym(n, 0, M_COPYALL, M_DONTWAIT); if (!n2) { m_freem(n); return; } m = icmp_do_error(n, type, code, 0, mtu); if (m == NULL) { m_freem(n2); return; } n = n2; ip = mtod(m, struct ip *); hlen = ip->ip_hl << 2; t = ip->ip_dst; ip->ip_dst = ip->ip_src; ip->ip_src = t; m->m_data += hlen; m->m_len -= hlen; icp = mtod(m, struct icmp *); icp->icmp_cksum = 0; icp->icmp_cksum = in_cksum(m, ntohs(ip->ip_len) - hlen); m->m_data -= hlen; m->m_len += hlen; ip->ip_v = IPVERSION; ip->ip_off &= htons(IP_DF); ip->ip_id = htons(ip_randomid()); ip->ip_ttl = MAXTTL; ip->ip_sum = 0; ip->ip_sum = in_cksum(m, hlen); /* Swap ethernet addresses */ bcopy(&eh->ether_dhost, ðer_tmp, sizeof(ether_tmp)); bcopy(&eh->ether_shost, &eh->ether_dhost, sizeof(ether_tmp)); bcopy(ðer_tmp, &eh->ether_shost, sizeof(ether_tmp)); /* Reattach SNAP header */ if (hassnap) { M_PREPEND(m, LLC_SNAPFRAMELEN, M_DONTWAIT); if (m == NULL) goto dropit; bcopy(llc, mtod(m, caddr_t), LLC_SNAPFRAMELEN); } /* Reattach ethernet header */ M_PREPEND(m, sizeof(*eh), M_DONTWAIT); if (m == NULL) goto dropit; bcopy(eh, mtod(m, caddr_t), sizeof(*eh)); bridge_output(ifp, m, NULL, NULL); m_freem(n); return; dropit: m_freem(n); } struct bridge_tunneltag * bridge_tunnel(struct mbuf *m) { struct m_tag *mtag; if ((mtag = m_tag_find(m, PACKET_TAG_TUNNEL, NULL)) == NULL) return (NULL); return ((struct bridge_tunneltag *)(mtag + 1)); } struct bridge_tunneltag * bridge_tunneltag(struct mbuf *m) { struct m_tag *mtag; if ((mtag = m_tag_find(m, PACKET_TAG_TUNNEL, NULL)) == NULL) { mtag = m_tag_get(PACKET_TAG_TUNNEL, sizeof(struct bridge_tunneltag), M_NOWAIT); if (mtag == NULL) return (NULL); bzero(mtag + 1, sizeof(struct bridge_tunneltag)); m_tag_prepend(m, mtag); } return ((struct bridge_tunneltag *)(mtag + 1)); } void bridge_tunneluntag(struct mbuf *m) { struct m_tag *mtag; if ((mtag = m_tag_find(m, PACKET_TAG_TUNNEL, NULL)) != NULL) m_tag_delete(m, mtag); } void bridge_copyaddr(struct sockaddr *src, struct sockaddr *dst) { if (src != NULL && src->sa_family != AF_UNSPEC) memcpy(dst, src, src->sa_len); else { dst->sa_family = AF_UNSPEC; dst->sa_len = 0; } } void bridge_copytag(struct bridge_tunneltag *src, struct bridge_tunneltag *dst) { if (src == NULL) { memset(dst, 0, sizeof(*dst)); } else { bridge_copyaddr(&src->brtag_peer.sa, &dst->brtag_peer.sa); bridge_copyaddr(&src->brtag_local.sa, &dst->brtag_local.sa); dst->brtag_id = src->brtag_id; } }