/* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */ /* * Copyright 2001 Wasabi Systems, Inc. * All rights reserved. * * Written by Jason R. Thorpe for Wasabi Systems, Inc. * * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed for the NetBSD Project by * Wasabi Systems, Inc. * 4. The name of Wasabi Systems, Inc. may not be used to endorse * or promote products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC * 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. */ /* * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Jason L. Wright * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * 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. * * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp */ /* * Network interface bridge support. * * TODO: * * - Currently only supports Ethernet-like interfaces (Ethernet, * 802.11, VLANs on Ethernet, etc.) Figure out a nice way * to bridge other types of interfaces (FDDI-FDDI, and maybe * consider heterogenous bridges). */ #include __FBSDID("$FreeBSD$"); #include "opt_inet.h" #include "opt_inet6.h" #include "opt_carp.h" #include #include #include #include #include #include #include /* for net/if.h */ #include #include /* string functions */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* for struct arpcom */ #include #include #include #include #ifdef INET6 #include #include #endif #ifdef DEV_CARP #include #endif #include #include /* for struct arpcom */ #include #include #include #include #include #include /* * Size of the route hash table. Must be a power of two. */ #ifndef BRIDGE_RTHASH_SIZE #define BRIDGE_RTHASH_SIZE 1024 #endif #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) /* * 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 (20 * 60) /* same as ARP */ #endif /* * Number of seconds between walks of the route list. */ #ifndef BRIDGE_RTABLE_PRUNE_PERIOD #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) #endif /* * List of capabilities to mask on the member interface. */ #define BRIDGE_IFCAPS_MASK IFCAP_TXCSUM static struct mtx bridge_list_mtx; eventhandler_tag bridge_detach_cookie = NULL; int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; uma_zone_t bridge_rtnode_zone; static int bridge_clone_create(struct if_clone *, int, caddr_t); static void bridge_clone_destroy(struct ifnet *); static int bridge_ioctl(struct ifnet *, u_long, caddr_t); static void bridge_mutecaps(struct bridge_iflist *, int); static void bridge_ifdetach(void *arg __unused, struct ifnet *); static void bridge_init(void *); static void bridge_dummynet(struct mbuf *, struct ifnet *); static void bridge_stop(struct ifnet *, int); static void bridge_start(struct ifnet *); static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, struct rtentry *); static void bridge_forward(struct bridge_softc *, struct mbuf *m); static void bridge_timer(void *); static void bridge_broadcast(struct bridge_softc *, struct ifnet *, struct mbuf *, int); static void bridge_span(struct bridge_softc *, struct mbuf *); static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, struct ifnet *, int, uint8_t); static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); static void bridge_rttrim(struct bridge_softc *); static void bridge_rtage(struct bridge_softc *); static void bridge_rtflush(struct bridge_softc *, int); static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *); static int bridge_rtable_init(struct bridge_softc *); static void bridge_rtable_fini(struct bridge_softc *); static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, const uint8_t *); static int bridge_rtnode_insert(struct bridge_softc *, struct bridge_rtnode *); static void bridge_rtnode_destroy(struct bridge_softc *, struct bridge_rtnode *); static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, const char *name); static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, struct ifnet *ifp); static void bridge_delete_member(struct bridge_softc *, struct bridge_iflist *, int); static void bridge_delete_span(struct bridge_softc *, struct bridge_iflist *); static int bridge_ioctl_add(struct bridge_softc *, void *); static int bridge_ioctl_del(struct bridge_softc *, void *); static int bridge_ioctl_gifflags(struct bridge_softc *, void *); static int bridge_ioctl_sifflags(struct bridge_softc *, void *); static int bridge_ioctl_scache(struct bridge_softc *, void *); static int bridge_ioctl_gcache(struct bridge_softc *, void *); static int bridge_ioctl_gifs(struct bridge_softc *, void *); static int bridge_ioctl_rts(struct bridge_softc *, void *); static int bridge_ioctl_saddr(struct bridge_softc *, void *); static int bridge_ioctl_sto(struct bridge_softc *, void *); static int bridge_ioctl_gto(struct bridge_softc *, void *); static int bridge_ioctl_daddr(struct bridge_softc *, void *); static int bridge_ioctl_flush(struct bridge_softc *, void *); static int bridge_ioctl_gpri(struct bridge_softc *, void *); static int bridge_ioctl_spri(struct bridge_softc *, void *); static int bridge_ioctl_ght(struct bridge_softc *, void *); static int bridge_ioctl_sht(struct bridge_softc *, void *); static int bridge_ioctl_gfd(struct bridge_softc *, void *); static int bridge_ioctl_sfd(struct bridge_softc *, void *); static int bridge_ioctl_gma(struct bridge_softc *, void *); static int bridge_ioctl_sma(struct bridge_softc *, void *); static int bridge_ioctl_sifprio(struct bridge_softc *, void *); static int bridge_ioctl_sifcost(struct bridge_softc *, void *); static int bridge_ioctl_addspan(struct bridge_softc *, void *); static int bridge_ioctl_delspan(struct bridge_softc *, void *); static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, int); static int bridge_ip_checkbasic(struct mbuf **mp); #ifdef INET6 static int bridge_ip6_checkbasic(struct mbuf **mp); #endif /* INET6 */ static int bridge_fragment(struct ifnet *, struct mbuf *, struct ether_header *, int, struct llc *); SYSCTL_DECL(_net_link); SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */ static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */ static int pfil_member = 1; /* run pfil hooks on the member interface */ static int pfil_ipfw = 0; /* layer2 filter with ipfw */ SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW, &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled"); SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW, &pfil_bridge, 0, "Packet filter on the bridge interface"); SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW, &pfil_member, 0, "Packet filter on the member interface"); struct bridge_control { int (*bc_func)(struct bridge_softc *, void *); int bc_argsize; int bc_flags; }; #define BC_F_COPYIN 0x01 /* copy arguments in */ #define BC_F_COPYOUT 0x02 /* copy arguments out */ #define BC_F_SUSER 0x04 /* do super-user check */ const struct bridge_control bridge_control_table[] = { { bridge_ioctl_add, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_del, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_gifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_COPYOUT }, { bridge_ioctl_sifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_scache, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_gcache, sizeof(struct ifbrparam), BC_F_COPYOUT }, { bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_COPYIN|BC_F_COPYOUT }, { bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_COPYIN|BC_F_COPYOUT }, { bridge_ioctl_saddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_sto, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_gto, sizeof(struct ifbrparam), BC_F_COPYOUT }, { bridge_ioctl_daddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_flush, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_gpri, sizeof(struct ifbrparam), BC_F_COPYOUT }, { bridge_ioctl_spri, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_ght, sizeof(struct ifbrparam), BC_F_COPYOUT }, { bridge_ioctl_sht, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_gfd, sizeof(struct ifbrparam), BC_F_COPYOUT }, { bridge_ioctl_sfd, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_gma, sizeof(struct ifbrparam), BC_F_COPYOUT }, { bridge_ioctl_sma, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_sifprio, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_sifcost, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_addspan, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, { bridge_ioctl_delspan, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER }, }; const int bridge_control_table_size = sizeof(bridge_control_table) / sizeof(bridge_control_table[0]); static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; LIST_HEAD(, bridge_softc) bridge_list; IFC_SIMPLE_DECLARE(bridge, 0); static int bridge_modevent(module_t mod, int type, void *data) { switch (type) { case MOD_LOAD: mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF); if_clone_attach(&bridge_cloner); bridge_rtnode_zone = uma_zcreate("bridge_rtnode", sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); LIST_INIT(&bridge_list); bridge_input_p = bridge_input; bridge_output_p = bridge_output; bridge_dn_p = bridge_dummynet; bstp_linkstate_p = bstp_linkstate; bridge_detach_cookie = EVENTHANDLER_REGISTER( ifnet_departure_event, bridge_ifdetach, NULL, EVENTHANDLER_PRI_ANY); break; case MOD_UNLOAD: EVENTHANDLER_DEREGISTER(ifnet_departure_event, bridge_detach_cookie); if_clone_detach(&bridge_cloner); uma_zdestroy(bridge_rtnode_zone); bridge_input_p = NULL; bridge_output_p = NULL; bridge_dn_p = NULL; bstp_linkstate_p = NULL; mtx_destroy(&bridge_list_mtx); break; default: return (EOPNOTSUPP); } return (0); } static moduledata_t bridge_mod = { "if_bridge", bridge_modevent, 0 }; DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); /* * handler for net.link.bridge.pfil_ipfw */ static int sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) { int enable = pfil_ipfw; int error; error = sysctl_handle_int(oidp, &enable, 0, req); enable = (enable) ? 1 : 0; if (enable != pfil_ipfw) { pfil_ipfw = enable; /* * Disable pfil so that ipfw doesnt run twice, if the user * really wants both then they can re-enable pfil_bridge and/or * pfil_member. Also allow non-ip packets as ipfw can filter by * layer2 type. */ if (pfil_ipfw) { pfil_onlyip = 0; pfil_bridge = 0; pfil_member = 0; } } return (error); } SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW, &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW"); /* * bridge_clone_create: * * Create a new bridge instance. */ static int bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params) { struct bridge_softc *sc, *sc2; struct ifnet *bifp, *ifp; u_char eaddr[6]; int retry; sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); BRIDGE_LOCK_INIT(sc); ifp = sc->sc_ifp = if_alloc(IFT_ETHER); if (ifp == NULL) { free(sc, M_DEVBUF); return (ENOSPC); } sc->sc_brtmax = BRIDGE_RTABLE_MAX; sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; /* Initialize our routing table. */ bridge_rtable_init(sc); callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0); LIST_INIT(&sc->sc_iflist); LIST_INIT(&sc->sc_spanlist); ifp->if_softc = sc; if_initname(ifp, ifc->ifc_name, unit); ifp->if_flags = IFF_BROADCAST | IFF_MULTICAST; ifp->if_ioctl = bridge_ioctl; ifp->if_start = bridge_start; ifp->if_init = bridge_init; ifp->if_type = IFT_BRIDGE; IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); ifp->if_snd.ifq_drv_maxlen = ifqmaxlen; IFQ_SET_READY(&ifp->if_snd); /* * Generate a random ethernet address with a locally administered * address. * * Since we are using random ethernet addresses for the bridge, it is * possible that we might have address collisions, so make sure that * this hardware address isn't already in use on another bridge. */ for (retry = 1; retry != 0;) { arc4rand(eaddr, ETHER_ADDR_LEN, 1); eaddr[0] &= ~1; /* clear multicast bit */ eaddr[0] |= 2; /* set the LAA bit */ retry = 0; mtx_lock(&bridge_list_mtx); LIST_FOREACH(sc2, &bridge_list, sc_list) { bifp = sc2->sc_ifp; if (memcmp(eaddr, IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) retry = 1; } mtx_unlock(&bridge_list_mtx); } bstp_attach(&sc->sc_stp); ether_ifattach(ifp, eaddr); /* Now undo some of the damage... */ ifp->if_baudrate = 0; ifp->if_type = IFT_BRIDGE; mtx_lock(&bridge_list_mtx); LIST_INSERT_HEAD(&bridge_list, sc, sc_list); mtx_unlock(&bridge_list_mtx); return (0); } /* * bridge_clone_destroy: * * Destroy a bridge instance. */ static void bridge_clone_destroy(struct ifnet *ifp) { struct bridge_softc *sc = ifp->if_softc; struct bridge_iflist *bif; BRIDGE_LOCK(sc); bridge_stop(ifp, 1); ifp->if_flags &= ~IFF_UP; while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) bridge_delete_member(sc, bif, 0); while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) { bridge_delete_span(sc, bif); } BRIDGE_UNLOCK(sc); callout_drain(&sc->sc_brcallout); mtx_lock(&bridge_list_mtx); LIST_REMOVE(sc, sc_list); mtx_unlock(&bridge_list_mtx); bstp_detach(&sc->sc_stp); ether_ifdetach(ifp); if_free_type(ifp, IFT_ETHER); /* Tear down the routing table. */ bridge_rtable_fini(sc); BRIDGE_LOCK_DESTROY(sc); free(sc, M_DEVBUF); } /* * bridge_ioctl: * * Handle a control request from the operator. */ static int bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) { struct bridge_softc *sc = ifp->if_softc; struct thread *td = curthread; union { struct ifbreq ifbreq; struct ifbifconf ifbifconf; struct ifbareq ifbareq; struct ifbaconf ifbaconf; struct ifbrparam ifbrparam; } args; struct ifdrv *ifd = (struct ifdrv *) data; const struct bridge_control *bc; int error = 0; BRIDGE_LOCK(sc); switch (cmd) { case SIOCADDMULTI: case SIOCDELMULTI: break; case SIOCGDRVSPEC: case SIOCSDRVSPEC: if (ifd->ifd_cmd >= bridge_control_table_size) { error = EINVAL; break; } bc = &bridge_control_table[ifd->ifd_cmd]; if (cmd == SIOCGDRVSPEC && (bc->bc_flags & BC_F_COPYOUT) == 0) { error = EINVAL; break; } else if (cmd == SIOCSDRVSPEC && (bc->bc_flags & BC_F_COPYOUT) != 0) { error = EINVAL; break; } if (bc->bc_flags & BC_F_SUSER) { error = suser(td); if (error) break; } if (ifd->ifd_len != bc->bc_argsize || ifd->ifd_len > sizeof(args)) { error = EINVAL; break; } bzero(&args, sizeof(args)); if (bc->bc_flags & BC_F_COPYIN) { error = copyin(ifd->ifd_data, &args, ifd->ifd_len); if (error) break; } error = (*bc->bc_func)(sc, &args); if (error) break; if (bc->bc_flags & BC_F_COPYOUT) error = copyout(&args, ifd->ifd_data, ifd->ifd_len); break; case SIOCSIFFLAGS: if (!(ifp->if_flags & IFF_UP) && (ifp->if_drv_flags & IFF_DRV_RUNNING)) { /* * If interface is marked down and it is running, * then stop and disable it. */ bridge_stop(ifp, 1); } else if ((ifp->if_flags & IFF_UP) && !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { /* * If interface is marked up and it is stopped, then * start it. */ BRIDGE_UNLOCK(sc); (*ifp->if_init)(sc); } break; case SIOCSIFMTU: /* Do not allow the MTU to be changed on the bridge */ error = EINVAL; break; default: /* * drop the lock as ether_ioctl() will call bridge_start() and * cause the lock to be recursed. */ BRIDGE_UNLOCK(sc); error = ether_ioctl(ifp, cmd, data); break; } if (BRIDGE_LOCKED(sc)) BRIDGE_UNLOCK(sc); return (error); } /* * bridge_mutecaps: * * Clear or restore unwanted capabilities on the member interface */ static void bridge_mutecaps(struct bridge_iflist *bif, int mute) { struct ifnet *ifp = bif->bif_ifp; struct ifreq ifr; int error; if (ifp->if_ioctl == NULL) return; bzero(&ifr, sizeof(ifr)); ifr.ifr_reqcap = ifp->if_capenable; if (mute) { /* mask off and save capabilities */ bif->bif_mutecap = ifr.ifr_reqcap & BRIDGE_IFCAPS_MASK; if (bif->bif_mutecap != 0) ifr.ifr_reqcap &= ~BRIDGE_IFCAPS_MASK; } else /* restore muted capabilities */ ifr.ifr_reqcap |= bif->bif_mutecap; if (bif->bif_mutecap != 0) { IFF_LOCKGIANT(ifp); error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); IFF_UNLOCKGIANT(ifp); } } /* * bridge_lookup_member: * * Lookup a bridge member interface. */ static struct bridge_iflist * bridge_lookup_member(struct bridge_softc *sc, const char *name) { struct bridge_iflist *bif; struct ifnet *ifp; BRIDGE_LOCK_ASSERT(sc); LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { ifp = bif->bif_ifp; if (strcmp(ifp->if_xname, name) == 0) return (bif); } return (NULL); } /* * bridge_lookup_member_if: * * Lookup a bridge member interface by ifnet*. */ static struct bridge_iflist * bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) { struct bridge_iflist *bif; BRIDGE_LOCK_ASSERT(sc); LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { if (bif->bif_ifp == member_ifp) return (bif); } return (NULL); } /* * bridge_delete_member: * * Delete the specified member interface. */ static void bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, int gone) { struct ifnet *ifs = bif->bif_ifp; BRIDGE_LOCK_ASSERT(sc); if (!gone) { switch (ifs->if_type) { case IFT_ETHER: case IFT_L2VLAN: /* * Take the interface out of promiscuous mode. */ (void) ifpromisc(ifs, 0); bridge_mutecaps(bif, 0); break; case IFT_GIF: break; default: #ifdef DIAGNOSTIC panic("bridge_delete_member: impossible"); #endif break; } } if (bif->bif_flags & IFBIF_STP) bstp_delete(&bif->bif_stp); ifs->if_bridge = NULL; BRIDGE_XLOCK(sc); LIST_REMOVE(bif, bif_next); BRIDGE_XDROP(sc); bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); free(bif, M_DEVBUF); } /* * bridge_delete_span: * * Delete the specified span interface. */ static void bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) { BRIDGE_LOCK_ASSERT(sc); KASSERT(bif->bif_ifp->if_bridge == NULL, ("%s: not a span interface", __func__)); LIST_REMOVE(bif, bif_next); free(bif, M_DEVBUF); } static int bridge_ioctl_add(struct bridge_softc *sc, void *arg) { struct ifbreq *req = arg; struct bridge_iflist *bif = NULL; struct ifnet *ifs; int error = 0; BRIDGE_LOCK_ASSERT(sc); ifs = ifunit(req->ifbr_ifsname); if (ifs == NULL) return (ENOENT); /* If it's in the span list, it can't be a member. */ LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) if (ifs == bif->bif_ifp) return (EBUSY); /* Allow the first Ethernet member to define the MTU */ if (ifs->if_type != IFT_GIF) { if (LIST_EMPTY(&sc->sc_iflist)) sc->sc_ifp->if_mtu = ifs->if_mtu; else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { if_printf(sc->sc_ifp, "invalid MTU for %s\n", ifs->if_xname); return (EINVAL); } } if (ifs->if_bridge == sc) return (EEXIST); if (ifs->if_bridge != NULL) return (EBUSY); bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); if (bif == NULL) return (ENOMEM); bif->bif_ifp = ifs; bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; switch (ifs->if_type) { case IFT_ETHER: case IFT_L2VLAN: /* * Place the interface into promiscuous mode. */ error = ifpromisc(ifs, 1); if (error) goto out; bridge_mutecaps(bif, 1); break; case IFT_GIF: break; default: error = EINVAL; goto out; } ifs->if_bridge = sc; /* * XXX: XLOCK HERE!?! * * NOTE: insert_***HEAD*** should be safe for the traversals. */ LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); out: if (error) { if (bif != NULL) free(bif, M_DEVBUF); } return (error); } static int bridge_ioctl_del(struct bridge_softc *sc, void *arg) { struct ifbreq *req = arg; struct bridge_iflist *bif; BRIDGE_LOCK_ASSERT(sc); bif = bridge_lookup_member(sc, req->ifbr_ifsname); if (bif == NULL) return (ENOENT); bridge_delete_member(sc, bif, 0); return (0); } static int bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) { struct ifbreq *req = arg; struct bridge_iflist *bif; BRIDGE_LOCK_ASSERT(sc); bif = bridge_lookup_member(sc, req->ifbr_ifsname); if (bif == NULL) return (ENOENT); req->ifbr_ifsflags = bif->bif_flags; req->ifbr_state = bif->bif_stp.bp_state; req->ifbr_priority = bif->bif_stp.bp_priority; req->ifbr_path_cost = bif->bif_stp.bp_path_cost; req->ifbr_portno = bif->bif_ifp->if_index & 0xff; return (0); } static int bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) { struct ifbreq *req = arg; struct bridge_iflist *bif; int error; BRIDGE_LOCK_ASSERT(sc); bif = bridge_lookup_member(sc, req->ifbr_ifsname); if (bif == NULL) return (ENOENT); if (req->ifbr_ifsflags & IFBIF_SPAN) /* SPAN is readonly */ return (EINVAL); if (req->ifbr_ifsflags & IFBIF_STP) { if ((bif->bif_flags & IFBIF_STP) == 0) { error = bstp_add(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); if (error) return (error); } } else { if ((bif->bif_flags & IFBIF_STP) != 0) bstp_delete(&bif->bif_stp); } bif->bif_flags = req->ifbr_ifsflags; return (0); } static int bridge_ioctl_scache(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; BRIDGE_LOCK_ASSERT(sc); sc->sc_brtmax = param->ifbrp_csize; bridge_rttrim(sc); return (0); } static int bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; BRIDGE_LOCK_ASSERT(sc); param->ifbrp_csize = sc->sc_brtmax; return (0); } static int bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) { struct ifbifconf *bifc = arg; struct bridge_iflist *bif; struct ifbreq breq; int count, len, error = 0; BRIDGE_LOCK_ASSERT(sc); count = 0; LIST_FOREACH(bif, &sc->sc_iflist, bif_next) count++; LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) count++; if (bifc->ifbic_len == 0) { bifc->ifbic_len = sizeof(breq) * count; return (0); } count = 0; len = bifc->ifbic_len; bzero(&breq, sizeof(breq)); LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { if (len < sizeof(breq)) break; strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, sizeof(breq.ifbr_ifsname)); breq.ifbr_ifsflags = bif->bif_flags; breq.ifbr_state = bif->bif_stp.bp_state; breq.ifbr_priority = bif->bif_stp.bp_priority; breq.ifbr_path_cost = bif->bif_stp.bp_path_cost; breq.ifbr_portno = bif->bif_ifp->if_index & 0xff; error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq)); if (error) break; count++; len -= sizeof(breq); } LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { if (len < sizeof(breq)) break; strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, sizeof(breq.ifbr_ifsname)); breq.ifbr_ifsflags = bif->bif_flags; breq.ifbr_state = bif->bif_stp.bp_state; breq.ifbr_priority = bif->bif_stp.bp_priority; breq.ifbr_path_cost = bif->bif_stp.bp_path_cost; breq.ifbr_portno = bif->bif_ifp->if_index & 0xff; error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq)); if (error) break; count++; len -= sizeof(breq); } bifc->ifbic_len = sizeof(breq) * count; return (error); } static int bridge_ioctl_rts(struct bridge_softc *sc, void *arg) { struct ifbaconf *bac = arg; struct bridge_rtnode *brt; struct ifbareq bareq; int count = 0, error = 0, len; BRIDGE_LOCK_ASSERT(sc); if (bac->ifbac_len == 0) return (0); len = bac->ifbac_len; bzero(&bareq, sizeof(bareq)); LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { if (len < sizeof(bareq)) goto out; strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, sizeof(bareq.ifba_ifsname)); memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && time_uptime < brt->brt_expire) bareq.ifba_expire = brt->brt_expire - time_uptime; else bareq.ifba_expire = 0; bareq.ifba_flags = brt->brt_flags; error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); if (error) goto out; count++; len -= sizeof(bareq); } out: bac->ifbac_len = sizeof(bareq) * count; return (error); } static int bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) { struct ifbareq *req = arg; struct bridge_iflist *bif; int error; BRIDGE_LOCK_ASSERT(sc); bif = bridge_lookup_member(sc, req->ifba_ifsname); if (bif == NULL) return (ENOENT); error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, req->ifba_flags); return (error); } static int bridge_ioctl_sto(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; BRIDGE_LOCK_ASSERT(sc); sc->sc_brttimeout = param->ifbrp_ctime; return (0); } static int bridge_ioctl_gto(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; BRIDGE_LOCK_ASSERT(sc); param->ifbrp_ctime = sc->sc_brttimeout; return (0); } static int bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) { struct ifbareq *req = arg; BRIDGE_LOCK_ASSERT(sc); return (bridge_rtdaddr(sc, req->ifba_dst)); } static int bridge_ioctl_flush(struct bridge_softc *sc, void *arg) { struct ifbreq *req = arg; BRIDGE_LOCK_ASSERT(sc); bridge_rtflush(sc, req->ifbr_ifsflags); return (0); } static int bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; struct bstp_state *bs = &sc->sc_stp; BRIDGE_LOCK_ASSERT(sc); param->ifbrp_prio = bs->bs_bridge_priority; return (0); } static int bridge_ioctl_spri(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; struct bstp_state *bs = &sc->sc_stp; BRIDGE_LOCK_ASSERT(sc); bs->bs_bridge_priority = param->ifbrp_prio; bstp_reinit(bs); return (0); } static int bridge_ioctl_ght(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; struct bstp_state *bs = &sc->sc_stp; BRIDGE_LOCK_ASSERT(sc); param->ifbrp_hellotime = bs->bs_bridge_hello_time >> 8; return (0); } static int bridge_ioctl_sht(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; struct bstp_state *bs = &sc->sc_stp; BRIDGE_LOCK_ASSERT(sc); if (param->ifbrp_hellotime == 0) return (EINVAL); bs->bs_bridge_hello_time = param->ifbrp_hellotime << 8; bstp_reinit(bs); return (0); } static int bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; struct bstp_state *bs = &sc->sc_stp; BRIDGE_LOCK_ASSERT(sc); param->ifbrp_fwddelay = bs->bs_bridge_forward_delay >> 8; return (0); } static int bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; struct bstp_state *bs = &sc->sc_stp; BRIDGE_LOCK_ASSERT(sc); if (param->ifbrp_fwddelay == 0) return (EINVAL); bs->bs_bridge_forward_delay = param->ifbrp_fwddelay << 8; bstp_reinit(bs); return (0); } static int bridge_ioctl_gma(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; struct bstp_state *bs = &sc->sc_stp; BRIDGE_LOCK_ASSERT(sc); param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; return (0); } static int bridge_ioctl_sma(struct bridge_softc *sc, void *arg) { struct ifbrparam *param = arg; struct bstp_state *bs = &sc->sc_stp; BRIDGE_LOCK_ASSERT(sc); if (param->ifbrp_maxage == 0) return (EINVAL); bs->bs_bridge_max_age = param->ifbrp_maxage << 8; bstp_reinit(bs); return (0); } static int bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) { struct ifbreq *req = arg; struct bridge_iflist *bif; BRIDGE_LOCK_ASSERT(sc); bif = bridge_lookup_member(sc, req->ifbr_ifsname); if (bif == NULL) return (ENOENT); bif->bif_stp.bp_priority = req->ifbr_priority; bstp_reinit(&sc->sc_stp); return (0); } static int bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) { struct ifbreq *req = arg; struct bridge_iflist *bif; BRIDGE_LOCK_ASSERT(sc); bif = bridge_lookup_member(sc, req->ifbr_ifsname); if (bif == NULL) return (ENOENT); bif->bif_stp.bp_path_cost = req->ifbr_path_cost; bstp_reinit(&sc->sc_stp); return (0); } static int bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) { struct ifbreq *req = arg; struct bridge_iflist *bif = NULL; struct ifnet *ifs; BRIDGE_LOCK_ASSERT(sc); ifs = ifunit(req->ifbr_ifsname); if (ifs == NULL) return (ENOENT); LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) if (ifs == bif->bif_ifp) return (EBUSY); if (ifs->if_bridge != NULL) return (EBUSY); switch (ifs->if_type) { case IFT_ETHER: case IFT_GIF: case IFT_L2VLAN: break; default: return (EINVAL); } bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); if (bif == NULL) return (ENOMEM); bif->bif_ifp = ifs; bif->bif_flags = IFBIF_SPAN; LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); return (0); } static int bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) { struct ifbreq *req = arg; struct bridge_iflist *bif; struct ifnet *ifs; BRIDGE_LOCK_ASSERT(sc); ifs = ifunit(req->ifbr_ifsname); if (ifs == NULL) return (ENOENT); LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) if (ifs == bif->bif_ifp) break; if (bif == NULL) return (ENOENT); bridge_delete_span(sc, bif); return (0); } /* * bridge_ifdetach: * * Detach an interface from a bridge. Called when a member * interface is detaching. */ static void bridge_ifdetach(void *arg __unused, struct ifnet *ifp) { struct bridge_softc *sc = ifp->if_bridge; struct bridge_iflist *bif; /* Check if the interface is a bridge member */ if (sc != NULL) { BRIDGE_LOCK(sc); bif = bridge_lookup_member_if(sc, ifp); if (bif != NULL) bridge_delete_member(sc, bif, 1); BRIDGE_UNLOCK(sc); return; } /* Check if the interface is a span port */ mtx_lock(&bridge_list_mtx); LIST_FOREACH(sc, &bridge_list, sc_list) { BRIDGE_LOCK(sc); LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) if (ifp == bif->bif_ifp) { bridge_delete_span(sc, bif); break; } BRIDGE_UNLOCK(sc); } mtx_unlock(&bridge_list_mtx); } /* * bridge_init: * * Initialize a bridge interface. */ static void bridge_init(void *xsc) { struct bridge_softc *sc = (struct bridge_softc *)xsc; struct ifnet *ifp = sc->sc_ifp; if (ifp->if_drv_flags & IFF_DRV_RUNNING) return; BRIDGE_LOCK(sc); callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, bridge_timer, sc); ifp->if_drv_flags |= IFF_DRV_RUNNING; bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ BRIDGE_UNLOCK(sc); } /* * bridge_stop: * * Stop the bridge interface. */ static void bridge_stop(struct ifnet *ifp, int disable) { struct bridge_softc *sc = ifp->if_softc; BRIDGE_LOCK_ASSERT(sc); if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) return; callout_stop(&sc->sc_brcallout); bstp_stop(&sc->sc_stp); bridge_rtflush(sc, IFBF_FLUSHDYN); ifp->if_drv_flags &= ~IFF_DRV_RUNNING; } /* * bridge_enqueue: * * Enqueue a packet on a bridge member interface. * */ __inline void bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) { int len, err = 0; short mflags; struct mbuf *m0; len = m->m_pkthdr.len; mflags = m->m_flags; /* We may be sending a fragment so traverse the mbuf */ for (; m; m = m0) { m0 = m->m_nextpkt; m->m_nextpkt = NULL; if (err == 0) IFQ_ENQUEUE(&dst_ifp->if_snd, m, err); } if (err == 0) { sc->sc_ifp->if_opackets++; sc->sc_ifp->if_obytes += len; dst_ifp->if_obytes += len; if (mflags & M_MCAST) { sc->sc_ifp->if_omcasts++; dst_ifp->if_omcasts++; } } if ((dst_ifp->if_drv_flags & IFF_DRV_OACTIVE) == 0) (*dst_ifp->if_start)(dst_ifp); } /* * bridge_dummynet: * * Receive a queued packet from dummynet and pass it on to the output * interface. * * The mbuf has the Ethernet header already attached. */ static void bridge_dummynet(struct mbuf *m, struct ifnet *ifp) { struct bridge_softc *sc; sc = ifp->if_bridge; /* * The packet didnt originate from a member interface. This should only * ever happen if a member interface is removed while packets are * queued for it. */ if (sc == NULL) { m_freem(m); return; } if (PFIL_HOOKED(&inet_pfil_hook) #ifdef INET6 || PFIL_HOOKED(&inet6_pfil_hook) #endif ) { if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) return; if (m == NULL) return; } bridge_enqueue(sc, ifp, m); } /* * bridge_output: * * Send output from a bridge member interface. This * performs the bridging function for locally originated * packets. * * The mbuf has the Ethernet header already attached. We must * enqueue or free the mbuf before returning. */ static int bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, struct rtentry *rt) { struct ether_header *eh; struct ifnet *dst_if; struct bridge_softc *sc; if (m->m_len < ETHER_HDR_LEN) { m = m_pullup(m, ETHER_HDR_LEN); if (m == NULL) return (0); } eh = mtod(m, struct ether_header *); sc = ifp->if_bridge; BRIDGE_LOCK(sc); /* * If bridge is down, but the original output interface is up, * go ahead and send out that interface. Otherwise, the packet * is dropped below. */ if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { dst_if = ifp; goto sendunicast; } /* * If the packet is a multicast, or we don't know a better way to * get there, send to all interfaces. */ if (ETHER_IS_MULTICAST(eh->ether_dhost)) dst_if = NULL; else dst_if = bridge_rtlookup(sc, eh->ether_dhost); if (dst_if == NULL) { struct bridge_iflist *bif; struct mbuf *mc; int error = 0, used = 0; BRIDGE_LOCK2REF(sc, error); if (error) { m_freem(m); return (0); } bridge_span(sc, m); LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { dst_if = bif->bif_ifp; if (dst_if->if_type == IFT_GIF) continue; if ((dst_if->if_drv_flags & IFF_DRV_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 && (bif->bif_flags & IFBIF_STP) != 0) { switch (bif->bif_stp.bp_state) { case BSTP_IFSTATE_BLOCKING: case BSTP_IFSTATE_LISTENING: case BSTP_IFSTATE_DISABLED: continue; } } if (LIST_NEXT(bif, bif_next) == NULL) { used = 1; mc = m; } else { mc = m_copypacket(m, M_DONTWAIT); if (mc == NULL) { sc->sc_ifp->if_oerrors++; continue; } } bridge_enqueue(sc, dst_if, mc); } if (used == 0) m_freem(m); BRIDGE_UNREF(sc); return (0); } sendunicast: /* * XXX Spanning tree consideration here? */ bridge_span(sc, m); if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { m_freem(m); BRIDGE_UNLOCK(sc); return (0); } BRIDGE_UNLOCK(sc); bridge_enqueue(sc, dst_if, m); return (0); } /* * bridge_start: * * Start output on a bridge. * */ static void bridge_start(struct ifnet *ifp) { struct bridge_softc *sc; struct mbuf *m; struct ether_header *eh; struct ifnet *dst_if; sc = ifp->if_softc; ifp->if_drv_flags |= IFF_DRV_OACTIVE; for (;;) { IFQ_DEQUEUE(&ifp->if_snd, m); if (m == 0) break; BPF_MTAP(ifp, m); eh = mtod(m, struct ether_header *); dst_if = NULL; BRIDGE_LOCK(sc); if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { dst_if = bridge_rtlookup(sc, eh->ether_dhost); } if (dst_if == NULL) bridge_broadcast(sc, ifp, m, 0); else { BRIDGE_UNLOCK(sc); bridge_enqueue(sc, dst_if, m); } } ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; } /* * bridge_forward: * * The forwarding function of the bridge. * * NOTE: Releases the lock on return. */ static void bridge_forward(struct bridge_softc *sc, struct mbuf *m) { struct bridge_iflist *bif; struct ifnet *src_if, *dst_if, *ifp; struct ether_header *eh; src_if = m->m_pkthdr.rcvif; BRIDGE_LOCK_ASSERT(sc); ifp = sc->sc_ifp; sc->sc_ifp->if_ipackets++; sc->sc_ifp->if_ibytes += m->m_pkthdr.len; /* * Look up the bridge_iflist. */ bif = bridge_lookup_member_if(sc, src_if); if (bif == NULL) { /* Interface is not a bridge member (anymore?) */ BRIDGE_UNLOCK(sc); m_freem(m); return; } if (bif->bif_flags & IFBIF_STP) { switch (bif->bif_stp.bp_state) { case BSTP_IFSTATE_BLOCKING: case BSTP_IFSTATE_LISTENING: case BSTP_IFSTATE_DISABLED: BRIDGE_UNLOCK(sc); m_freem(m); return; } } eh = mtod(m, struct ether_header *); /* * If the interface is learning, and the source * address is valid and not multicast, record * the address. */ if ((bif->bif_flags & IFBIF_LEARNING) != 0 && ETHER_IS_MULTICAST(eh->ether_shost) == 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) == 0) { (void) bridge_rtupdate(sc, eh->ether_shost, src_if, 0, IFBAF_DYNAMIC); } if ((bif->bif_flags & IFBIF_STP) != 0 && bif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) { m_freem(m); BRIDGE_UNLOCK(sc); return; } /* * At this point, the port either doesn't participate * in spanning tree or it is in the forwarding state. */ /* * If the packet is unicast, destined for someone on * "this" side of the bridge, drop it. */ if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { dst_if = bridge_rtlookup(sc, eh->ether_dhost); if (src_if == dst_if) { BRIDGE_UNLOCK(sc); m_freem(m); return; } } else { /* ...forward it to all interfaces. */ sc->sc_ifp->if_imcasts++; dst_if = NULL; } /* * If we have a destination interface which is a member of our bridge, * OR this is a unicast packet, push it through the bpf(4) machinery. * For broadcast or multicast packets, don't bother because it will * be reinjected into ether_input. We do this before we pass the packets * through the pfil(9) framework, as it is possible that pfil(9) will * drop the packet, or possibly modify it, making it difficult to debug * firewall issues on the bridge. */ if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) BPF_MTAP(ifp, m); /* run the packet filter */ if (PFIL_HOOKED(&inet_pfil_hook) #ifdef INET6 || PFIL_HOOKED(&inet6_pfil_hook) #endif ) { BRIDGE_UNLOCK(sc); if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) return; if (m == NULL) return; BRIDGE_LOCK(sc); } if (dst_if == NULL) { bridge_broadcast(sc, src_if, m, 1); return; } /* * At this point, we're dealing with a unicast frame * going to a different interface. */ if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { BRIDGE_UNLOCK(sc); m_freem(m); return; } bif = bridge_lookup_member_if(sc, dst_if); if (bif == NULL) { /* Not a member of the bridge (anymore?) */ BRIDGE_UNLOCK(sc); m_freem(m); return; } if (bif->bif_flags & IFBIF_STP) { switch (bif->bif_stp.bp_state) { case BSTP_IFSTATE_DISABLED: case BSTP_IFSTATE_BLOCKING: BRIDGE_UNLOCK(sc); m_freem(m); return; } } BRIDGE_UNLOCK(sc); if (PFIL_HOOKED(&inet_pfil_hook) #ifdef INET6 || PFIL_HOOKED(&inet6_pfil_hook) #endif ) { if (bridge_pfil(&m, sc->sc_ifp, dst_if, PFIL_OUT) != 0) return; if (m == NULL) return; } bridge_enqueue(sc, dst_if, m); } /* * bridge_input: * * Receive input from a member interface. Queue the packet for * bridging if it is not for us. */ static struct mbuf * bridge_input(struct ifnet *ifp, struct mbuf *m) { struct bridge_softc *sc = ifp->if_bridge; struct bridge_iflist *bif; struct ifnet *bifp; struct ether_header *eh; struct mbuf *mc, *mc2; if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) return (m); bifp = sc->sc_ifp; /* * Implement support for bridge monitoring. If this flag has been * set on this interface, discard the packet once we push it through * the bpf(4) machinery, but before we do, increment the byte and * packet counters associated with this interface. */ if ((bifp->if_flags & IFF_MONITOR) != 0) { m->m_pkthdr.rcvif = bifp; BPF_MTAP(bifp, m); bifp->if_ipackets++; bifp->if_ibytes += m->m_pkthdr.len; m_free(m); return (NULL); } BRIDGE_LOCK(sc); bif = bridge_lookup_member_if(sc, ifp); if (bif == NULL) { BRIDGE_UNLOCK(sc); return (m); } eh = mtod(m, struct ether_header *); if (memcmp(eh->ether_dhost, IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) { /* * If the packet is for us, set the packets source as the * bridge, and return the packet back to ether_input for * local processing. */ /* Mark the packet as arriving on the bridge interface */ m->m_pkthdr.rcvif = bifp; BPF_MTAP(bifp, m); bifp->if_ipackets++; BRIDGE_UNLOCK(sc); return (m); } bridge_span(sc, m); if (ETHER_IS_MULTICAST(eh->ether_dhost)) { /* Tap off 802.1D packets; they do not get forwarded. */ if (memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { m = bstp_input(&bif->bif_stp, ifp, m); if (m == NULL) { BRIDGE_UNLOCK(sc); return (NULL); } } if (bif->bif_flags & IFBIF_STP) { switch (bif->bif_stp.bp_state) { case BSTP_IFSTATE_BLOCKING: case BSTP_IFSTATE_LISTENING: case BSTP_IFSTATE_DISABLED: BRIDGE_UNLOCK(sc); return (m); } } if (bcmp(etherbroadcastaddr, eh->ether_dhost, sizeof(etherbroadcastaddr)) == 0) m->m_flags |= M_BCAST; else m->m_flags |= M_MCAST; /* * Make a deep copy of the packet and enqueue the copy * for bridge processing; return the original packet for * local processing. */ mc = m_dup(m, M_DONTWAIT); if (mc == NULL) { BRIDGE_UNLOCK(sc); return (m); } /* Perform the bridge forwarding function with the copy. */ bridge_forward(sc, mc); /* * Reinject the mbuf as arriving on the bridge so we have a * chance at claiming multicast packets. We can not loop back * here from ether_input as a bridge is never a member of a * bridge. */ KASSERT(bifp->if_bridge == NULL, ("loop created in bridge_input")); mc2 = m_dup(m, M_DONTWAIT); if (mc2 != NULL) { /* Keep the layer3 header aligned */ int i = min(mc2->m_pkthdr.len, max_protohdr); mc2 = m_copyup(mc2, i, ETHER_ALIGN); } if (mc2 != NULL) { mc2->m_pkthdr.rcvif = bifp; (*bifp->if_input)(bifp, mc2); } /* Return the original packet for local processing. */ return (m); } if (bif->bif_flags & IFBIF_STP) { switch (bif->bif_stp.bp_state) { case BSTP_IFSTATE_BLOCKING: case BSTP_IFSTATE_LISTENING: case BSTP_IFSTATE_DISABLED: BRIDGE_UNLOCK(sc); return (m); } } /* * Unicast. Make sure it's not for us. */ LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { if (bif->bif_ifp->if_type == IFT_GIF) continue; /* It is destined for us. */ if (memcmp(IF_LLADDR(bif->bif_ifp), eh->ether_dhost, ETHER_ADDR_LEN) == 0 #ifdef DEV_CARP || (bif->bif_ifp->if_carp && carp_forus(bif->bif_ifp->if_carp, eh->ether_dhost)) #endif ) { if (bif->bif_flags & IFBIF_LEARNING) (void) bridge_rtupdate(sc, eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); m->m_pkthdr.rcvif = bif->bif_ifp; BRIDGE_UNLOCK(sc); return (m); } /* We just received a packet that we sent out. */ if (memcmp(IF_LLADDR(bif->bif_ifp), eh->ether_shost, ETHER_ADDR_LEN) == 0 #ifdef DEV_CARP || (bif->bif_ifp->if_carp && carp_forus(bif->bif_ifp->if_carp, eh->ether_shost)) #endif ) { BRIDGE_UNLOCK(sc); m_freem(m); return (NULL); } } /* Perform the bridge forwarding function. */ bridge_forward(sc, m); return (NULL); } /* * bridge_broadcast: * * Send a frame to all interfaces that are members of * the bridge, except for the one on which the packet * arrived. * * NOTE: Releases the lock on return. */ static void bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, struct mbuf *m, int runfilt) { struct bridge_iflist *bif; struct mbuf *mc; struct ifnet *dst_if; int error = 0, used = 0, i; BRIDGE_LOCK_ASSERT(sc); BRIDGE_LOCK2REF(sc, error); if (error) { m_freem(m); return; } /* Filter on the bridge interface before broadcasting */ if (runfilt && (PFIL_HOOKED(&inet_pfil_hook) #ifdef INET6 || PFIL_HOOKED(&inet6_pfil_hook) #endif )) { if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) goto out; if (m == NULL) goto out; } LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { dst_if = bif->bif_ifp; if (dst_if == src_if) continue; if (bif->bif_flags & IFBIF_STP) { switch (bif->bif_stp.bp_state) { case BSTP_IFSTATE_BLOCKING: case BSTP_IFSTATE_DISABLED: continue; } } if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && (m->m_flags & (M_BCAST|M_MCAST)) == 0) continue; if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) continue; if (LIST_NEXT(bif, bif_next) == NULL) { mc = m; used = 1; } else { mc = m_dup(m, M_DONTWAIT); if (mc == NULL) { sc->sc_ifp->if_oerrors++; continue; } } /* * Filter on the output interface. Pass a NULL bridge interface * pointer so we do not redundantly filter on the bridge for * each interface we broadcast on. */ if (runfilt && (PFIL_HOOKED(&inet_pfil_hook) #ifdef INET6 || PFIL_HOOKED(&inet6_pfil_hook) #endif )) { if (used == 0) { /* Keep the layer3 header aligned */ i = min(mc->m_pkthdr.len, max_protohdr); mc = m_copyup(mc, i, ETHER_ALIGN); if (mc == NULL) { sc->sc_ifp->if_oerrors++; continue; } } if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) continue; if (mc == NULL) continue; } bridge_enqueue(sc, dst_if, mc); } if (used == 0) m_freem(m); out: BRIDGE_UNREF(sc); } /* * bridge_span: * * Duplicate a packet out one or more interfaces that are in span mode, * the original mbuf is unmodified. */ static void bridge_span(struct bridge_softc *sc, struct mbuf *m) { struct bridge_iflist *bif; struct ifnet *dst_if; struct mbuf *mc; if (LIST_EMPTY(&sc->sc_spanlist)) return; LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { dst_if = bif->bif_ifp; if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) continue; mc = m_copypacket(m, M_DONTWAIT); if (mc == NULL) { sc->sc_ifp->if_oerrors++; continue; } bridge_enqueue(sc, dst_if, mc); } } /* * bridge_rtupdate: * * Add a bridge routing entry. */ static int bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, struct ifnet *dst_if, int setflags, uint8_t flags) { struct bridge_rtnode *brt; int error; BRIDGE_LOCK_ASSERT(sc); /* * A route for this destination might already exist. If so, * update it, otherwise create a new one. */ if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) { if (sc->sc_brtcnt >= sc->sc_brtmax) return (ENOSPC); /* * Allocate a new bridge forwarding node, and * initialize the expiration time and Ethernet * address. */ brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); if (brt == NULL) return (ENOMEM); brt->brt_flags = IFBAF_DYNAMIC; memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); if ((error = bridge_rtnode_insert(sc, brt)) != 0) { uma_zfree(bridge_rtnode_zone, brt); return (error); } } if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) brt->brt_ifp = dst_if; if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) brt->brt_expire = time_uptime + sc->sc_brttimeout; if (setflags) brt->brt_flags = flags; return (0); } /* * bridge_rtlookup: * * Lookup the destination interface for an address. */ static struct ifnet * bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) { struct bridge_rtnode *brt; BRIDGE_LOCK_ASSERT(sc); if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) return (NULL); return (brt->brt_ifp); } /* * bridge_rttrim: * * Trim the routine table so that we have a number * of routing entries less than or equal to the * maximum number. */ static void bridge_rttrim(struct bridge_softc *sc) { struct bridge_rtnode *brt, *nbrt; BRIDGE_LOCK_ASSERT(sc); /* Make sure we actually need to do this. */ if (sc->sc_brtcnt <= sc->sc_brtmax) return; /* Force an aging cycle; this might trim enough addresses. */ bridge_rtage(sc); if (sc->sc_brtcnt <= sc->sc_brtmax) return; for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { nbrt = LIST_NEXT(brt, brt_list); if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { bridge_rtnode_destroy(sc, brt); if (sc->sc_brtcnt <= sc->sc_brtmax) return; } } } /* * bridge_timer: * * Aging timer for the bridge. */ static void bridge_timer(void *arg) { struct bridge_softc *sc = arg; BRIDGE_LOCK_ASSERT(sc); bridge_rtage(sc); if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, bridge_timer, sc); } /* * bridge_rtage: * * Perform an aging cycle. */ static void bridge_rtage(struct bridge_softc *sc) { struct bridge_rtnode *brt, *nbrt; BRIDGE_LOCK_ASSERT(sc); for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { nbrt = LIST_NEXT(brt, brt_list); if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { if (time_uptime >= brt->brt_expire) bridge_rtnode_destroy(sc, brt); } } } /* * bridge_rtflush: * * Remove all dynamic addresses from the bridge. */ static void bridge_rtflush(struct bridge_softc *sc, int full) { struct bridge_rtnode *brt, *nbrt; BRIDGE_LOCK_ASSERT(sc); for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { nbrt = LIST_NEXT(brt, brt_list); if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) bridge_rtnode_destroy(sc, brt); } } /* * bridge_rtdaddr: * * Remove an address from the table. */ static int bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) { struct bridge_rtnode *brt; BRIDGE_LOCK_ASSERT(sc); if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) return (ENOENT); bridge_rtnode_destroy(sc, brt); return (0); } /* * bridge_rtdelete: * * Delete routes to a speicifc member interface. */ void bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) { struct bridge_rtnode *brt, *nbrt; BRIDGE_LOCK_ASSERT(sc); for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { nbrt = LIST_NEXT(brt, brt_list); if (brt->brt_ifp == ifp && (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) bridge_rtnode_destroy(sc, brt); } } /* * bridge_rtable_init: * * Initialize the route table for this bridge. */ static int bridge_rtable_init(struct bridge_softc *sc) { int i; sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, M_DEVBUF, M_NOWAIT); if (sc->sc_rthash == NULL) return (ENOMEM); for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) LIST_INIT(&sc->sc_rthash[i]); sc->sc_rthash_key = arc4random(); LIST_INIT(&sc->sc_rtlist); return (0); } /* * bridge_rtable_fini: * * Deconstruct the route table for this bridge. */ static void bridge_rtable_fini(struct bridge_softc *sc) { free(sc->sc_rthash, M_DEVBUF); } /* * The following hash function is adapted from "Hash Functions" by Bob Jenkins * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). */ #define mix(a, b, c) \ do { \ a -= b; a -= c; a ^= (c >> 13); \ b -= c; b -= a; b ^= (a << 8); \ c -= a; c -= b; c ^= (b >> 13); \ a -= b; a -= c; a ^= (c >> 12); \ b -= c; b -= a; b ^= (a << 16); \ c -= a; c -= b; c ^= (b >> 5); \ a -= b; a -= c; a ^= (c >> 3); \ b -= c; b -= a; b ^= (a << 10); \ c -= a; c -= b; c ^= (b >> 15); \ } while (/*CONSTCOND*/0) static __inline uint32_t bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) { uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; b += addr[5] << 8; b += addr[4]; a += addr[3] << 24; a += addr[2] << 16; a += addr[1] << 8; a += addr[0]; mix(a, b, c); return (c & BRIDGE_RTHASH_MASK); } #undef mix static int bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) { int i, d; for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { d = ((int)a[i]) - ((int)b[i]); } return (d); } /* * bridge_rtnode_lookup: * * Look up a bridge route node for the specified destination. */ static struct bridge_rtnode * bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) { struct bridge_rtnode *brt; uint32_t hash; int dir; BRIDGE_LOCK_ASSERT(sc); hash = bridge_rthash(sc, addr); LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); if (dir == 0) return (brt); if (dir > 0) return (NULL); } return (NULL); } /* * bridge_rtnode_insert: * * Insert the specified bridge node into the route table. We * assume the entry is not already in the table. */ static int bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) { struct bridge_rtnode *lbrt; uint32_t hash; int dir; BRIDGE_LOCK_ASSERT(sc); hash = bridge_rthash(sc, brt->brt_addr); lbrt = LIST_FIRST(&sc->sc_rthash[hash]); if (lbrt == NULL) { LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); goto out; } do { dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); if (dir == 0) return (EEXIST); if (dir > 0) { LIST_INSERT_BEFORE(lbrt, brt, brt_hash); goto out; } if (LIST_NEXT(lbrt, brt_hash) == NULL) { LIST_INSERT_AFTER(lbrt, brt, brt_hash); goto out; } lbrt = LIST_NEXT(lbrt, brt_hash); } while (lbrt != NULL); #ifdef DIAGNOSTIC panic("bridge_rtnode_insert: impossible"); #endif out: LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); sc->sc_brtcnt++; return (0); } /* * bridge_rtnode_destroy: * * Destroy a bridge rtnode. */ static void bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) { BRIDGE_LOCK_ASSERT(sc); LIST_REMOVE(brt, brt_hash); LIST_REMOVE(brt, brt_list); sc->sc_brtcnt--; uma_zfree(bridge_rtnode_zone, brt); } /* * Send bridge packets through pfil if they are one of the types pfil can deal * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without * question.) If *bifp or *ifp are NULL then packet filtering is skipped for * that interface. */ static int bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) { int snap, error, i, hlen; struct ether_header *eh1, eh2; struct ip_fw_args args; struct ip *ip; struct llc llc1; u_int16_t ether_type; snap = 0; error = -1; /* Default error if not error == 0 */ /* we may return with the IP fields swapped, ensure its not shared */ KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0) return (0); /* filtering is disabled */ i = min((*mp)->m_pkthdr.len, max_protohdr); if ((*mp)->m_len < i) { *mp = m_pullup(*mp, i); if (*mp == NULL) { printf("%s: m_pullup failed\n", __func__); return (-1); } } eh1 = mtod(*mp, struct ether_header *); ether_type = ntohs(eh1->ether_type); /* * Check for SNAP/LLC. */ if (ether_type < ETHERMTU) { struct llc *llc2 = (struct llc *)(eh1 + 1); if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && llc2->llc_dsap == LLC_SNAP_LSAP && llc2->llc_ssap == LLC_SNAP_LSAP && llc2->llc_control == LLC_UI) { ether_type = htons(llc2->llc_un.type_snap.ether_type); snap = 1; } } /* * If we're trying to filter bridge traffic, don't look at anything * other than IP and ARP traffic. If the filter doesn't understand * IPv6, don't allow IPv6 through the bridge either. This is lame * since if we really wanted, say, an AppleTalk filter, we are hosed, * but of course we don't have an AppleTalk filter to begin with. * (Note that since pfil doesn't understand ARP it will pass *ALL* * ARP traffic.) */ switch (ether_type) { case ETHERTYPE_ARP: case ETHERTYPE_REVARP: return (0); /* Automatically pass */ case ETHERTYPE_IP: #ifdef INET6 case ETHERTYPE_IPV6: #endif /* INET6 */ break; default: /* * Check to see if the user wants to pass non-ip * packets, these will not be checked by pfil(9) and * passed unconditionally so the default is to drop. */ if (pfil_onlyip) goto bad; } /* Strip off the Ethernet header and keep a copy. */ m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); m_adj(*mp, ETHER_HDR_LEN); /* Strip off snap header, if present */ if (snap) { m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); m_adj(*mp, sizeof(struct llc)); } /* * Check the IP header for alignment and errors */ if (dir == PFIL_IN) { switch (ether_type) { case ETHERTYPE_IP: error = bridge_ip_checkbasic(mp); break; #ifdef INET6 case ETHERTYPE_IPV6: error = bridge_ip6_checkbasic(mp); break; #endif /* INET6 */ default: error = 0; } if (error) goto bad; } if (IPFW_LOADED && pfil_ipfw != 0 && dir == PFIL_OUT && ifp != NULL) { error = -1; args.rule = ip_dn_claim_rule(*mp); if (args.rule != NULL && fw_one_pass) goto ipfwpass; /* packet already partially processed */ args.m = *mp; args.oif = ifp; args.next_hop = NULL; args.eh = &eh2; args.inp = NULL; /* used by ipfw uid/gid/jail rules */ i = ip_fw_chk_ptr(&args); *mp = args.m; if (*mp == NULL) return (error); if (DUMMYNET_LOADED && (i == IP_FW_DUMMYNET)) { /* put the Ethernet header back on */ M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); if (*mp == NULL) return (error); bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); /* * Pass the pkt to dummynet, which consumes it. The * packet will return to us via bridge_dummynet(). */ args.oif = ifp; ip_dn_io_ptr(*mp, DN_TO_IFB_FWD, &args); return (error); } if (i != IP_FW_PASS) /* drop */ goto bad; } ipfwpass: error = 0; /* * Run the packet through pfil */ switch (ether_type) { case ETHERTYPE_IP: /* * before calling the firewall, swap fields the same as * IP does. here we assume the header is contiguous */ ip = mtod(*mp, struct ip *); ip->ip_len = ntohs(ip->ip_len); ip->ip_off = ntohs(ip->ip_off); /* * Run pfil on the member interface and the bridge, both can * be skipped by clearing pfil_member or pfil_bridge. * * Keep the order: * in_if -> bridge_if -> out_if */ if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, dir, NULL); if (*mp == NULL || error != 0) /* filter may consume */ break; if (pfil_member && ifp != NULL) error = pfil_run_hooks(&inet_pfil_hook, mp, ifp, dir, NULL); if (*mp == NULL || error != 0) /* filter may consume */ break; if (pfil_bridge && dir == PFIL_IN && bifp != NULL) error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, dir, NULL); if (*mp == NULL || error != 0) /* filter may consume */ break; /* check if we need to fragment the packet */ if (pfil_member && ifp != NULL && dir == PFIL_OUT) { i = (*mp)->m_pkthdr.len; if (i > ifp->if_mtu) { error = bridge_fragment(ifp, *mp, &eh2, snap, &llc1); return (error); } } /* Recalculate the ip checksum and restore byte ordering */ ip = mtod(*mp, struct ip *); hlen = ip->ip_hl << 2; if (hlen < sizeof(struct ip)) goto bad; if (hlen > (*mp)->m_len) { if ((*mp = m_pullup(*mp, hlen)) == 0) goto bad; ip = mtod(*mp, struct ip *); if (ip == NULL) goto bad; } ip->ip_len = htons(ip->ip_len); ip->ip_off = htons(ip->ip_off); ip->ip_sum = 0; if (hlen == sizeof(struct ip)) ip->ip_sum = in_cksum_hdr(ip); else ip->ip_sum = in_cksum(*mp, hlen); break; #ifdef INET6 case ETHERTYPE_IPV6: if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp, dir, NULL); if (*mp == NULL || error != 0) /* filter may consume */ break; if (pfil_member && ifp != NULL) error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp, dir, NULL); if (*mp == NULL || error != 0) /* filter may consume */ break; if (pfil_bridge && dir == PFIL_IN && bifp != NULL) error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp, dir, NULL); break; #endif default: error = 0; break; } if (*mp == NULL) return (error); if (error != 0) goto bad; error = -1; /* * Finally, put everything back the way it was and return */ if (snap) { M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); if (*mp == NULL) return (error); bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); } M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); if (*mp == NULL) return (error); bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); return (0); bad: m_freem(*mp); *mp = NULL; return (error); } /* * Perform basic checks on header size since * pfil assumes ip_input has already processed * it for it. Cut-and-pasted from ip_input.c. * Given how simple the IPv6 version is, * does the IPv4 version really need to be * this complicated? * * XXX Should we update ipstat here, or not? * XXX Right now we update ipstat but not * XXX csum_counter. */ static int bridge_ip_checkbasic(struct mbuf **mp) { struct mbuf *m = *mp; struct ip *ip; int len, hlen; u_short sum; if (*mp == NULL) return (-1); if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { if ((m = m_copyup(m, sizeof(struct ip), (max_linkhdr + 3) & ~3)) == NULL) { /* XXXJRT new stat, please */ ipstat.ips_toosmall++; goto bad; } } else if (__predict_false(m->m_len < sizeof (struct ip))) { if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { ipstat.ips_toosmall++; goto bad; } } ip = mtod(m, struct ip *); if (ip == NULL) goto bad; if (ip->ip_v != IPVERSION) { ipstat.ips_badvers++; goto bad; } hlen = ip->ip_hl << 2; if (hlen < sizeof(struct ip)) { /* minimum header length */ ipstat.ips_badhlen++; goto bad; } if (hlen > m->m_len) { if ((m = m_pullup(m, hlen)) == 0) { ipstat.ips_badhlen++; goto bad; } ip = mtod(m, struct ip *); if (ip == NULL) goto bad; } if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); } else { if (hlen == sizeof(struct ip)) { sum = in_cksum_hdr(ip); } else { sum = in_cksum(m, hlen); } } if (sum) { ipstat.ips_badsum++; goto bad; } /* Retrieve the packet length. */ len = ntohs(ip->ip_len); /* * Check for additional length bogosity */ if (len < hlen) { ipstat.ips_badlen++; goto bad; } /* * Check that the amount of data in the buffers * is as at least much as the IP header would have us expect. * Drop packet if shorter than we expect. */ if (m->m_pkthdr.len < len) { ipstat.ips_tooshort++; goto bad; } /* Checks out, proceed */ *mp = m; return (0); bad: *mp = m; return (-1); } #ifdef INET6 /* * Same as above, but for IPv6. * Cut-and-pasted from ip6_input.c. * XXX Should we update ip6stat, or not? */ static int bridge_ip6_checkbasic(struct mbuf **mp) { struct mbuf *m = *mp; struct ip6_hdr *ip6; /* * If the IPv6 header is not aligned, slurp it up into a new * mbuf with space for link headers, in the event we forward * it. Otherwise, if it is aligned, make sure the entire base * IPv6 header is in the first mbuf of the chain. */ if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { struct ifnet *inifp = m->m_pkthdr.rcvif; if ((m = m_copyup(m, sizeof(struct ip6_hdr), (max_linkhdr + 3) & ~3)) == NULL) { /* XXXJRT new stat, please */ ip6stat.ip6s_toosmall++; in6_ifstat_inc(inifp, ifs6_in_hdrerr); goto bad; } } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { struct ifnet *inifp = m->m_pkthdr.rcvif; if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { ip6stat.ip6s_toosmall++; in6_ifstat_inc(inifp, ifs6_in_hdrerr); goto bad; } } ip6 = mtod(m, struct ip6_hdr *); if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { ip6stat.ip6s_badvers++; in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); goto bad; } /* Checks out, proceed */ *mp = m; return (0); bad: *mp = m; return (-1); } #endif /* INET6 */ /* * bridge_fragment: * * Return a fragmented mbuf chain. */ static int bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh, int snap, struct llc *llc) { struct mbuf *m0; struct ip *ip; int error = -1; if (m->m_len < sizeof(struct ip) && (m = m_pullup(m, sizeof(struct ip))) == NULL) goto out; ip = mtod(m, struct ip *); error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist, CSUM_DELAY_IP); if (error) goto out; /* walk the chain and re-add the Ethernet header */ for (m0 = m; m0; m0 = m0->m_nextpkt) { if (error == 0) { if (snap) { M_PREPEND(m0, sizeof(struct llc), M_DONTWAIT); if (m0 == NULL) { error = ENOBUFS; continue; } bcopy(llc, mtod(m0, caddr_t), sizeof(struct llc)); } M_PREPEND(m0, ETHER_HDR_LEN, M_DONTWAIT); if (m0 == NULL) { error = ENOBUFS; continue; } bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN); } else m_freem(m); } if (error == 0) ipstat.ips_fragmented++; return (error); out: if (m != NULL) m_freem(m); return (error); }