/* $OpenBSD: if_bridge.c,v 1.20 1999/10/27 03:41:48 jason Exp $ */ /* * Copyright (c) 1999 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. */ #include "bridge.h" #include "bpfilter.h" #if NBRIDGE > 0 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef INET #include #include #include #include #include #ifdef IPFILTER #include #include #endif #endif #if NBPFILTER > 0 #include #endif #include #ifndef BRIDGE_RTABLE_SIZE #define BRIDGE_RTABLE_SIZE 1024 #endif #define BRIDGE_RTABLE_MASK (BRIDGE_RTABLE_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 240 #endif /* * This really should be defined in if_llc.h but in case it isn't. */ #ifndef llc_snap #define llc_snap llc_un.type_snap #endif extern int ifqmaxlen; /* * Bridge interface list */ struct bridge_iflist { LIST_ENTRY(bridge_iflist) next; /* next in list */ struct ifnet *ifp; /* member interface */ u_int32_t bif_flags; /* member flags */ }; /* * Bridge route node */ struct bridge_rtnode { LIST_ENTRY(bridge_rtnode) brt_next; /* next in list */ struct ifnet *brt_if; /* destination ifs */ u_int8_t brt_flags; /* address flags */ u_int8_t brt_age; /* age counter */ struct ether_addr brt_addr; /* dst addr */ }; /* * Software state for each bridge */ struct bridge_softc { struct ifnet sc_if; /* the interface */ u_int32_t sc_brtmax; /* max # addresses */ u_int32_t sc_brtcnt; /* current # addrs */ u_int32_t sc_brttimeout; /* timeout ticks */ LIST_HEAD(, bridge_iflist) sc_iflist; /* interface list */ LIST_HEAD(bridge_rthead, bridge_rtnode) *sc_rts;/* hash table */ }; struct bridge_softc bridgectl[NBRIDGE]; void bridgeattach __P((int)); int bridge_ioctl __P((struct ifnet *, u_long, caddr_t)); void bridge_start __P((struct ifnet *)); void bridge_broadcast __P((struct bridge_softc *, struct ifnet *, struct ether_header *, struct mbuf *)); void bridge_stop __P((struct bridge_softc *)); void bridge_init __P((struct bridge_softc *)); int bridge_bifconf __P((struct bridge_softc *, struct ifbifconf *)); int bridge_rtfind __P((struct bridge_softc *, struct ifbaconf *)); void bridge_rtage __P((void *)); void bridge_rttrim __P((struct bridge_softc *)); void bridge_rtdelete __P((struct bridge_softc *, struct ifnet *)); int bridge_rtdaddr __P((struct bridge_softc *, struct ether_addr *)); int bridge_rtflush __P((struct bridge_softc *, int)); struct ifnet * bridge_rtupdate __P((struct bridge_softc *, struct ether_addr *, struct ifnet *ifp, int, u_int8_t)); struct ifnet * bridge_rtlookup __P((struct bridge_softc *, struct ether_addr *)); u_int32_t bridge_hash __P((struct ether_addr *)); #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) #if defined(INET) && (defined(IPFILTER) || defined(IPFILTER_LKM)) /* * Filter hooks */ #define BRIDGE_FILTER_PASS 0 #define BRIDGE_FILTER_DROP 1 int bridge_filter __P((struct bridge_softc *, struct ifnet *, struct ether_header *, struct mbuf **)); #endif void bridgeattach(unused) int unused; { int i; struct ifnet *ifp; for (i = 0; i < NBRIDGE; i++) { bridgectl[i].sc_brtmax = BRIDGE_RTABLE_MAX; bridgectl[i].sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; LIST_INIT(&bridgectl[i].sc_iflist); ifp = &bridgectl[i].sc_if; sprintf(ifp->if_xname, "bridge%d", i); ifp->if_softc = &bridgectl[i]; ifp->if_mtu = ETHERMTU; ifp->if_ioctl = bridge_ioctl; ifp->if_output = bridge_output; ifp->if_start = bridge_start; ifp->if_type = IFT_PROPVIRTUAL; ifp->if_snd.ifq_maxlen = ifqmaxlen; ifp->if_hdrlen = sizeof(struct ether_header); if_attach(ifp); #if NBPFILTER > 0 bpfattach(&bridgectl[i].sc_if.if_bpf, ifp, DLT_EN10MB, sizeof(struct ether_header)); #endif } } int bridge_ioctl(ifp, cmd, data) struct ifnet *ifp; u_long cmd; caddr_t data; { struct proc *prc = curproc; /* XXX */ struct ifnet *ifs; struct bridge_softc *sc = (struct bridge_softc *)ifp->if_softc; struct ifbreq *req = (struct ifbreq *)data; struct ifbaconf *baconf = (struct ifbaconf *)data; struct ifbareq *bareq = (struct ifbareq *)data; struct ifbcachereq *bcachereq = (struct ifbcachereq *)data; struct ifbifconf *bifconf = (struct ifbifconf *)data; struct ifbcachetoreq *bcacheto = (struct ifbcachetoreq *)data; struct ifreq ifreq; int error = 0, s; struct bridge_iflist *p; s = splimp(); switch (cmd) { case SIOCBRDGADD: if ((error = suser(prc->p_ucred, &prc->p_acflag)) != 0) break; ifs = ifunit(req->ifbr_ifsname); if (ifs == NULL) { /* no such interface */ error = ENOENT; break; } if (ifs->if_bridge == (caddr_t)sc) { error = EEXIST; break; } if (ifs->if_bridge != NULL) { error = EBUSY; break; } if (ifs->if_type != IFT_ETHER) { error = EINVAL; break; } if ((ifs->if_flags & IFF_UP) == 0) { /* * Bring interface up long enough to set * promiscuous flag, then shut it down again. */ strncpy(ifreq.ifr_name, req->ifbr_ifsname, sizeof(ifreq.ifr_name) - 1); ifreq.ifr_name[sizeof(ifreq.ifr_name) - 1] = '\0'; 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; strncpy(ifreq.ifr_name, req->ifbr_ifsname, sizeof(ifreq.ifr_name) - 1); ifreq.ifr_name[sizeof(ifreq.ifr_name) - 1] = '\0'; 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; } p = (struct bridge_iflist *) malloc( sizeof(struct bridge_iflist), M_DEVBUF, M_NOWAIT); if (p == NULL) { /* list alloc failed */ error = ENOMEM; ifpromisc(ifs, 0); /* decr promisc cnt */ break; } p->ifp = ifs; p->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; LIST_INSERT_HEAD(&sc->sc_iflist, p, next); ifs->if_bridge = (caddr_t)sc; break; case SIOCBRDGDEL: if ((error = suser(prc->p_ucred, &prc->p_acflag)) != 0) break; p = LIST_FIRST(&sc->sc_iflist); while (p != NULL) { if (strncmp(p->ifp->if_xname, req->ifbr_ifsname, sizeof(p->ifp->if_xname)) == 0) { p->ifp->if_bridge = NULL; error = ifpromisc(p->ifp, 0); LIST_REMOVE(p, next); bridge_rtdelete(sc, p->ifp); free(p, M_DEVBUF); break; } p = LIST_NEXT(p, next); } if (p == NULL) { error = ENOENT; break; } break; case SIOCBRDGIFS: error = bridge_bifconf(sc, bifconf); break; case SIOCBRDGGIFFLGS: ifs = ifunit(req->ifbr_ifsname); if (ifs == NULL) { error = ENOENT; break; } if ((caddr_t)sc != ifs->if_bridge) { error = ESRCH; break; } p = LIST_FIRST(&sc->sc_iflist); while (p != NULL && p->ifp != ifs) { p = LIST_NEXT(p, next); } if (p == NULL) { error = ESRCH; break; } req->ifbr_ifsflags = p->bif_flags; break; case SIOCBRDGSIFFLGS: if ((error = suser(prc->p_ucred, &prc->p_acflag)) != 0) break; ifs = ifunit(req->ifbr_ifsname); if (ifs == NULL) { error = ENOENT; break; } if ((caddr_t)sc != ifs->if_bridge) { error = ESRCH; break; } p = LIST_FIRST(&sc->sc_iflist); while (p != NULL && p->ifp != ifs) { p = LIST_NEXT(p, next); } if (p == NULL) { error = ESRCH; break; } p->bif_flags = req->ifbr_ifsflags; break; case SIOCBRDGRTS: error = bridge_rtfind(sc, baconf); break; case SIOCBRDGFLUSH: if ((error = suser(prc->p_ucred, &prc->p_acflag)) != 0) break; error = bridge_rtflush(sc, req->ifbr_ifsflags); break; case SIOCBRDGSADDR: if ((error = suser(prc->p_ucred, &prc->p_acflag)) != 0) break; ifs = ifunit(bareq->ifba_ifsname); if (ifs == NULL) { /* no such interface */ error = ENOENT; break; } if (ifs->if_bridge == NULL || ifs->if_bridge != (caddr_t)sc) { error = ESRCH; break; } ifs = bridge_rtupdate(sc, &bareq->ifba_dst, ifs, 1, bareq->ifba_flags); if (ifs == NULL) error = ENOMEM; break; case SIOCBRDGDADDR: if ((error = suser(prc->p_ucred, &prc->p_acflag)) != 0) break; error = bridge_rtdaddr(sc, &bareq->ifba_dst); break; case SIOCBRDGGCACHE: bcachereq->ifbc_size = sc->sc_brtmax; break; case SIOCBRDGSCACHE: if ((error = suser(prc->p_ucred, &prc->p_acflag)) != 0) break; sc->sc_brtmax = bcachereq->ifbc_size; bridge_rttrim(sc); break; case SIOCBRDGSTO: if ((error = suser(prc->p_ucred, &prc->p_acflag)) != 0) break; sc->sc_brttimeout = bcacheto->ifbct_time; untimeout(bridge_rtage, sc); if (bcacheto->ifbct_time != 0) timeout(bridge_rtage, sc, sc->sc_brttimeout); break; case SIOCBRDGGTO: bcacheto->ifbct_time = sc->sc_brttimeout; 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; default: error = EINVAL; } splx(s); return (error); } /* Detach an interface from a bridge. */ void bridge_ifdetach(ifp) struct ifnet *ifp; { struct bridge_softc *bsc = (struct bridge_softc *)ifp->if_bridge; struct bridge_iflist *bif; for (bif = LIST_FIRST(&bsc->sc_iflist); bif; bif = LIST_NEXT(bif, next)) if (bif->ifp == ifp) { LIST_REMOVE(bif, next); bridge_rtdelete(bsc, ifp); free(bif, M_DEVBUF); break; } } int bridge_bifconf(sc, bifc) struct bridge_softc *sc; struct ifbifconf *bifc; { struct bridge_iflist *p; u_int32_t total = 0, i; int error = 0; struct ifbreq breq; p = LIST_FIRST(&sc->sc_iflist); while (p != NULL) { total++; p = LIST_NEXT(p, next); } if (bifc->ifbic_len == 0) { i = total; goto done; } p = LIST_FIRST(&sc->sc_iflist); i = 0; while (p != NULL && bifc->ifbic_len > i * sizeof(breq)) { strncpy(breq.ifbr_name, sc->sc_if.if_xname, sizeof(breq.ifbr_name)-1); breq.ifbr_name[sizeof(breq.ifbr_name) - 1] = '\0'; strncpy(breq.ifbr_ifsname, p->ifp->if_xname, sizeof(breq.ifbr_ifsname)-1); breq.ifbr_ifsname[sizeof(breq.ifbr_ifsname) - 1] = '\0'; breq.ifbr_ifsflags = p->bif_flags; error = copyout((caddr_t)&breq, (caddr_t)(bifc->ifbic_req + i), sizeof(breq)); if (error) goto done; p = LIST_NEXT(p, next); i++; bifc->ifbic_len -= sizeof(breq); } done: bifc->ifbic_len = i * sizeof(breq); return (error); } void bridge_init(sc) struct bridge_softc *sc; { struct ifnet *ifp = &sc->sc_if; int i, s; if ((ifp->if_flags & IFF_RUNNING) == IFF_RUNNING) return; s = splhigh(); if (sc->sc_rts == NULL) { sc->sc_rts = (struct bridge_rthead *)malloc( BRIDGE_RTABLE_SIZE * (sizeof(struct bridge_rthead)), M_DEVBUF, M_NOWAIT); if (sc->sc_rts == NULL) { splx(s); return; } for (i = 0; i < BRIDGE_RTABLE_SIZE; i++) { LIST_INIT(&sc->sc_rts[i]); } } ifp->if_flags |= IFF_RUNNING; splx(s); if (sc->sc_brttimeout != 0) timeout(bridge_rtage, sc, sc->sc_brttimeout * hz); } /* * Stop the bridge and deallocate the routing table. */ void bridge_stop(sc) 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; untimeout(bridge_rtage, sc); 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 free the mbuf before exitting. */ int bridge_output(ifp, m, sa, rt) struct ifnet *ifp; struct mbuf *m; struct sockaddr *sa; struct rtentry *rt; { struct ether_header *eh; struct ifnet *dst_if; struct ether_addr *src, *dst; struct arpcom *ac = (struct arpcom *)ifp; struct bridge_softc *sc; struct bridge_iflist *p; struct mbuf *mc; int s; if (m->m_len < sizeof(*eh)) { m = m_pullup(m, sizeof(*eh)); if (m == NULL) return (0); } eh = mtod(m, struct ether_header *); dst = (struct ether_addr *)&eh->ether_dhost[0]; src = (struct ether_addr *)&eh->ether_shost[0]; sc = (struct bridge_softc *)ifp->if_bridge; s = splimp(); /* * 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 the packet is a broadcast or we don't know a better way to * get there. */ dst_if = bridge_rtlookup(sc, dst); if (dst_if == NULL || eh->ether_dhost[0] & 1) { for (p = LIST_FIRST(&sc->sc_iflist); p != NULL; p = LIST_NEXT(p, next)) { if ((p->ifp->if_flags & IFF_RUNNING) == 0) continue; if (IF_QFULL(&p->ifp->if_snd)) { sc->sc_if.if_oerrors++; continue; } mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); if (mc == NULL) { sc->sc_if.if_oerrors++; continue; } sc->sc_if.if_opackets++; sc->sc_if.if_obytes += m->m_pkthdr.len; IF_ENQUEUE(&p->ifp->if_snd, mc); if ((p->ifp->if_flags & IFF_OACTIVE) == 0) (*p->ifp->if_start)(p->ifp); } m_freem(m); splx(s); return (0); } bcopy(ac->ac_enaddr, src, ETHER_ADDR_LEN); sendunicast: if ((dst_if->if_flags & IFF_RUNNING) == 0) { m_freem(m); splx(s); return (0); } if (IF_QFULL(&dst_if->if_snd)) { sc->sc_if.if_oerrors++; m_freem(m); splx(s); return (0); } sc->sc_if.if_opackets++; sc->sc_if.if_obytes += m->m_pkthdr.len; IF_ENQUEUE(&dst_if->if_snd, m); if ((dst_if->if_flags & IFF_OACTIVE) == 0) (*dst_if->if_start)(dst_if); splx(s); return (0); } /* * Start output on the bridge. This function should never be called. */ void bridge_start(ifp) struct ifnet *ifp; { } /* * Loop through each bridge interface and process their input queues. */ void bridgeintr(void) { int i, s; struct bridge_softc *sc; struct ifnet *bifp, *src_if, *dst_if; struct bridge_iflist *ifl; struct ether_addr *dst, *src; struct ether_header *eh; struct mbuf *m; for (i = 0; i < NBRIDGE; i++) { sc = &bridgectl[i]; bifp = &sc->sc_if; for (;;) { s = splimp(); IF_DEQUEUE(&bifp->if_snd, m); splx(s); if (m == NULL) break; src_if = m->m_pkthdr.rcvif; if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) { m_freem(m); continue; } #if NBPFILTER > 0 if (sc->sc_if.if_bpf) bpf_mtap(sc->sc_if.if_bpf, m); #endif sc->sc_if.if_lastchange = time; sc->sc_if.if_ipackets++; sc->sc_if.if_ibytes += m->m_pkthdr.len; ifl = LIST_FIRST(&sc->sc_iflist); while (ifl != NULL && ifl->ifp != src_if) { ifl = LIST_NEXT(ifl, next); } if (ifl == NULL) { m_freem(m); continue; } if (m->m_len < sizeof(*eh)) { m = m_pullup(m, sizeof(*eh)); if (m == NULL) continue; } eh = mtod(m, struct ether_header *); 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 it's 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); /* * If packet is unicast, destined for someone on "this" * side of the bridge, drop it. */ dst_if = bridge_rtlookup(sc, dst); if ((m->m_flags & (M_BCAST | M_MCAST)) == 0 && dst_if == src_if) { m_freem(m); continue; } /* * 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); continue; } if (sc->sc_if.if_flags & IFF_LINK0 && ETHERADDR_IS_IP_MCAST(dst)) { m_freem(m); continue; } if (sc->sc_if.if_flags & IFF_LINK1 && !ETHERADDR_IS_IP_MCAST(dst)) { m_freem(m); continue; } } #if defined(INET) && (defined(IPFILTER) || defined(IPFILTER_LKM)) if (bridge_filter(sc, src_if, eh, &m) == BRIDGE_FILTER_DROP) { if (m != NULL) m_freem(m); continue; } #endif /* * If the packet is a multicast or broadcast, then * forward it to all interfaces. */ if (m->m_flags & (M_BCAST | M_MCAST)) { bifp->if_imcasts++; bridge_broadcast(sc, src_if, eh, m); continue; } if (dst_if != NULL) { if ((dst_if->if_flags & IFF_RUNNING) == 0) { m_freem(m); continue; } s = splimp(); if (IF_QFULL(&dst_if->if_snd)) { sc->sc_if.if_oerrors++; m_freem(m); splx(s); continue; } sc->sc_if.if_opackets++; sc->sc_if.if_obytes += m->m_pkthdr.len; IF_ENQUEUE(&dst_if->if_snd, m); if ((dst_if->if_flags & IFF_OACTIVE) == 0) (*dst_if->if_start)(dst_if); splx(s); continue; } bridge_broadcast(sc, src_if, eh, m); dst_if = NULL; } } } /* * Receive input from an interface. Rebroadcast if necessary to other * bridge members. */ struct mbuf * bridge_input(ifp, eh, m) struct ifnet *ifp; struct ether_header *eh; struct mbuf *m; { struct bridge_softc *sc; int s; struct bridge_iflist *ifl; struct arpcom *ac; struct ether_header *neh; struct mbuf *mc; /* * Make sure this interface is a bridge member. */ if (ifp == NULL || ifp->if_bridge == NULL || m == NULL) return (m); sc = (struct bridge_softc *)ifp->if_bridge; if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) return (m); if (m->m_flags & (M_BCAST | M_MCAST)) { /* make a copy of 'm' with 'eh' tacked on to the * beginning. Return 'm' for local processing * and enqueue the copy. Schedule netisr. */ mc = m_copym2(m, 0, M_COPYALL, M_NOWAIT); if (mc == NULL) return (m); M_PREPEND(mc, sizeof(*eh), M_DONTWAIT); if (mc == NULL) return (m); neh = mtod(mc, struct ether_header *); bcopy(eh, neh, sizeof(struct ether_header)); s = splimp(); if (IF_QFULL(&sc->sc_if.if_snd)) { m_freem(mc); splx(s); return (m); } IF_ENQUEUE(&sc->sc_if.if_snd, mc); splx(s); schednetisr(NETISR_BRIDGE); return (m); } else { ifl = LIST_FIRST(&sc->sc_iflist); while (ifl != NULL) { ac = (struct arpcom *)ifl->ifp; if (bcmp(ac->ac_enaddr, eh->ether_dhost, ETHER_ADDR_LEN) == 0) { bridge_rtupdate(sc, (struct ether_addr *)&eh->ether_dhost[0], ifp, 0, IFBAF_DYNAMIC); return (m); } ifl = LIST_NEXT(ifl, next); } M_PREPEND(m, sizeof(*eh), M_DONTWAIT); if (m == NULL) return (NULL); neh = mtod(m, struct ether_header *); bcopy(eh, neh, sizeof(struct ether_header)); s = splimp(); if (IF_QFULL(&sc->sc_if.if_snd)) { m_freem(m); splx(s); return (NULL); } IF_ENQUEUE(&sc->sc_if.if_snd, m); splx(s); schednetisr(NETISR_BRIDGE); return (NULL); } } /* * Send a frame to all interfaces that are members of the bridge * (except the one it came in on). This code assumes that it is * running at splnet or higher. */ void bridge_broadcast(sc, ifp, eh, m) struct bridge_softc *sc; struct ifnet *ifp; struct ether_header *eh; struct mbuf *m; { struct bridge_iflist *p; struct mbuf *mc; int used = 0; for (p = LIST_FIRST(&sc->sc_iflist); p; p = LIST_NEXT(p, next)) { /* * Don't retransmit out of the same interface where * the packet was received from. */ if (p->ifp->if_index == ifp->if_index) continue; if ((p->bif_flags & IFBIF_DISCOVER) == 0 && (m->m_flags & (M_BCAST | M_MCAST)) == 0) continue; if ((p->ifp->if_flags & IFF_RUNNING) == 0) continue; if (IF_QFULL(&p->ifp->if_snd)) { sc->sc_if.if_oerrors++; continue; } /* If last one, reuse the passed-in mbuf */ if (LIST_NEXT(p, next) == NULL) { mc = m; used = 1; } else { mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); if (mc == NULL) { sc->sc_if.if_oerrors++; continue; } } sc->sc_if.if_opackets++; sc->sc_if.if_obytes += m->m_pkthdr.len; if ((eh->ether_shost[0] & 1) == 0) ifp->if_omcasts++; IF_ENQUEUE(&p->ifp->if_snd, mc); if ((p->ifp->if_flags & IFF_OACTIVE) == 0) (*p->ifp->if_start)(p->ifp); } if (!used) m_freem(m); } struct ifnet * bridge_rtupdate(sc, ea, ifp, setflags, flags) struct bridge_softc *sc; struct ether_addr *ea; struct ifnet *ifp; int setflags; u_int8_t flags; { struct bridge_rtnode *p, *q; u_int32_t h; int s, dir; s = splhigh(); if (sc->sc_rts == NULL) { if (setflags && flags == IFBAF_STATIC) { sc->sc_rts = (struct bridge_rthead *)malloc( BRIDGE_RTABLE_SIZE * (sizeof(struct bridge_rthead)),M_DEVBUF,M_NOWAIT); if (sc->sc_rts == NULL) goto done; for (h = 0; h < BRIDGE_RTABLE_SIZE; h++) LIST_INIT(&sc->sc_rts[h]); } else goto done; } h = bridge_hash(ea); p = LIST_FIRST(&sc->sc_rts[h]); if (p == NULL) { if (sc->sc_brtcnt >= sc->sc_brtmax) goto done; p = (struct bridge_rtnode *)malloc( sizeof(struct bridge_rtnode), M_DEVBUF, M_NOWAIT); if (p == NULL) goto done; bcopy(ea, &p->brt_addr, sizeof(p->brt_addr)); p->brt_if = ifp; p->brt_age = 1; if (setflags) p->brt_flags = flags; else p->brt_flags = IFBAF_DYNAMIC; LIST_INSERT_HEAD(&sc->sc_rts[h], p, brt_next); sc->sc_brtcnt++; goto want; } do { q = p; p = LIST_NEXT(p, brt_next); dir = bcmp(ea, &q->brt_addr, sizeof(q->brt_addr)); if (dir == 0) { if (setflags) { q->brt_if = ifp; q->brt_flags = flags; } if (q->brt_if == ifp) q->brt_age = 1; ifp = q->brt_if; goto want; } if (dir > 0) { if (sc->sc_brtcnt >= sc->sc_brtmax) goto done; p = (struct bridge_rtnode *)malloc( sizeof(struct bridge_rtnode), M_DEVBUF, M_NOWAIT); if (p == NULL) goto done; bcopy(ea, &p->brt_addr, sizeof(p->brt_addr)); p->brt_if = ifp; p->brt_age = 1; if (setflags) p->brt_flags = flags; else p->brt_flags = IFBAF_DYNAMIC; LIST_INSERT_BEFORE(q, p, brt_next); sc->sc_brtcnt++; goto want; } if (p == NULL) { if (sc->sc_brtcnt >= sc->sc_brtmax) goto done; p = (struct bridge_rtnode *)malloc( sizeof(struct bridge_rtnode), M_DEVBUF, M_NOWAIT); if (p == NULL) goto done; bcopy(ea, &p->brt_addr, sizeof(p->brt_addr)); p->brt_if = ifp; p->brt_age = 1; if (setflags) p->brt_flags = flags; else p->brt_flags = IFBAF_DYNAMIC; LIST_INSERT_AFTER(q, p, brt_next); sc->sc_brtcnt++; goto want; } } while (p != NULL); done: ifp = NULL; want: splx(s); return (ifp); } struct ifnet * bridge_rtlookup(sc, ea) struct bridge_softc *sc; struct ether_addr *ea; { struct bridge_rtnode *p; u_int32_t h; int s, dir; /* * Lock out everything else */ s = splhigh(); if (sc->sc_rts == NULL) goto fail; h = bridge_hash(ea); p = LIST_FIRST(&sc->sc_rts[h]); while (p != NULL) { dir = bcmp(ea, &p->brt_addr, sizeof(p->brt_addr)); if (dir == 0) { splx(s); return (p->brt_if); } if (dir > 0) goto fail; p = LIST_NEXT(p, brt_next); } fail: splx(s); return (NULL); } /* * The following hash function is adapted from 'Hash Functions' by Bob Jenkins * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). * "You may use this code any way you wish, private, educational, or * commercial. It's free." */ #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(0) u_int32_t bridge_hash(addr) struct ether_addr *addr; { u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = 0xdeadbeef; b += addr->ether_addr_octet[5] << 8; b += addr->ether_addr_octet[4]; a += addr->ether_addr_octet[3] << 24; a += addr->ether_addr_octet[2] << 16; a += addr->ether_addr_octet[1] << 8; a += addr->ether_addr_octet[0]; mix(a, b, c); return (c & BRIDGE_RTABLE_MASK); } /* * Trim the routing table so that we've got a number of routes * less than or equal to the maximum. */ void bridge_rttrim(sc) struct bridge_softc *sc; { struct bridge_rtnode *n, *p; int s, i; s = splhigh(); if (sc->sc_rts == NULL) goto done; /* * Make sure we have to trim the address table */ if (sc->sc_brtcnt <= sc->sc_brtmax) goto done; /* * Force an aging cycle, this might trim enough addresses. */ splx(s); bridge_rtage(sc); s = splhigh(); if (sc->sc_brtcnt <= sc->sc_brtmax) goto done; for (i = 0; i < BRIDGE_RTABLE_SIZE; i++) { n = LIST_FIRST(&sc->sc_rts[i]); while (n != NULL) { p = LIST_NEXT(n, brt_next); if ((n->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { LIST_REMOVE(n, brt_next); sc->sc_brtcnt--; free(n, M_DEVBUF); n = p; if (sc->sc_brtcnt <= sc->sc_brtmax) goto done; } } } done: if (sc->sc_rts != NULL && sc->sc_brtcnt == 0 && (sc->sc_if.if_flags & IFF_UP) == 0) { free(sc->sc_rts, M_DEVBUF); sc->sc_rts = NULL; } splx(s); } /* * Perform an aging cycle */ void bridge_rtage(vsc) void *vsc; { struct bridge_softc *sc = (struct bridge_softc *)vsc; struct bridge_rtnode *n, *p; int s, i; s = splhigh(); if (sc->sc_rts == NULL) { splx(s); return; } for (i = 0; i < BRIDGE_RTABLE_SIZE; i++) { n = LIST_FIRST(&sc->sc_rts[i]); while (n != NULL) { if ((n->brt_flags & IFBAF_TYPEMASK) == IFBAF_STATIC) { n->brt_age = !n->brt_age; if (n->brt_age) n->brt_age = 0; n = LIST_NEXT(n, brt_next); } else if (n->brt_age) { n->brt_age = 0; n = LIST_NEXT(n, brt_next); } else { p = LIST_NEXT(n, brt_next); LIST_REMOVE(n, brt_next); sc->sc_brtcnt--; free(n, M_DEVBUF); n = p; } } } splx(s); if (sc->sc_brttimeout != 0) timeout(bridge_rtage, sc, sc->sc_brttimeout * hz); } /* * Remove all dynamic addresses from the cache */ int bridge_rtflush(sc, full) struct bridge_softc *sc; int full; { int s, i; struct bridge_rtnode *p, *n; s = splhigh(); if (sc->sc_rts == NULL) goto done; for (i = 0; i < BRIDGE_RTABLE_SIZE; i++) { n = LIST_FIRST(&sc->sc_rts[i]); while (n != NULL) { if (full || (n->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { p = LIST_NEXT(n, brt_next); LIST_REMOVE(n, brt_next); sc->sc_brtcnt--; free(n, M_DEVBUF); n = p; } else n = LIST_NEXT(n, brt_next); } } if (sc->sc_brtcnt == 0 && (sc->sc_if.if_flags & IFF_UP) == 0) { free(sc->sc_rts, M_DEVBUF); sc->sc_rts = NULL; } done: splx(s); return (0); } /* * Remove an address from the cache */ int bridge_rtdaddr(sc, ea) struct bridge_softc *sc; struct ether_addr *ea; { int h, s; struct bridge_rtnode *p; s = splhigh(); if (sc->sc_rts == NULL) goto done; h = bridge_hash(ea); p = LIST_FIRST(&sc->sc_rts[h]); while (p != NULL) { if (bcmp(ea, &p->brt_addr, sizeof(p->brt_addr)) == 0) { LIST_REMOVE(p, brt_next); sc->sc_brtcnt--; free(p, M_DEVBUF); if (sc->sc_brtcnt == 0 && (sc->sc_if.if_flags & IFF_UP) == 0) { free(sc->sc_rts, M_DEVBUF); sc->sc_rts = NULL; } splx(s); return (0); } p = LIST_NEXT(p, brt_next); } done: splx(s); return (ENOENT); } /* * Delete routes to a specific interface member. */ void bridge_rtdelete(sc, ifp) struct bridge_softc *sc; struct ifnet *ifp; { int i, s; struct bridge_rtnode *n, *p; s = splhigh(); if (sc->sc_rts == NULL) goto done; /* * Loop through all of the hash buckets and traverse each * chain looking for routes to this interface. */ for (i = 0; i < BRIDGE_RTABLE_SIZE; i++) { n = LIST_FIRST(&sc->sc_rts[i]); while (n != NULL) { if (n->brt_if == ifp) { /* found one */ p = LIST_NEXT(n, brt_next); LIST_REMOVE(n, brt_next); sc->sc_brtcnt--; free(n, M_DEVBUF); n = p; } else n = LIST_NEXT(n, brt_next); } } if (sc->sc_brtcnt == 0 && (sc->sc_if.if_flags & IFF_UP) == 0) { free(sc->sc_rts, M_DEVBUF); sc->sc_rts = NULL; } done: splx(s); } /* * Gather all of the routes for this interface. */ int bridge_rtfind(sc, baconf) struct bridge_softc *sc; struct ifbaconf *baconf; { int i, s, error = 0; u_int32_t cnt = 0; struct bridge_rtnode *n; struct ifbareq bareq; s = splhigh(); if (sc->sc_rts == NULL || baconf->ifbac_len == 0) goto done; for (i = 0, cnt = 0; i < BRIDGE_RTABLE_SIZE; i++) { n = LIST_FIRST(&sc->sc_rts[i]); while (n != NULL) { if (baconf->ifbac_len < (cnt + 1) * sizeof(struct ifbareq)) goto done; bcopy(sc->sc_if.if_xname, bareq.ifba_name, sizeof(bareq.ifba_name)); bcopy(n->brt_if->if_xname, bareq.ifba_ifsname, sizeof(bareq.ifba_ifsname)); bcopy(&n->brt_addr, &bareq.ifba_dst, sizeof(bareq.ifba_dst)); bareq.ifba_age = n->brt_age; bareq.ifba_flags = n->brt_flags; error = copyout((caddr_t)&bareq, (caddr_t)(baconf->ifbac_req + cnt), sizeof(bareq)); if (error) goto done; n = LIST_NEXT(n, brt_next); cnt++; } } done: baconf->ifbac_len = cnt * sizeof(struct ifbareq); splx(s); return (error); } #if defined(INET) && (defined(IPFILTER) || defined(IPFILTER_LKM)) struct ehllc { struct ether_header eh; struct llc llc; }; /* * 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 */ int bridge_filter(sc, ifp, eh, np) struct bridge_softc *sc; struct ifnet *ifp; struct ether_header *eh; struct mbuf **np; { struct mbuf *m = *np; struct ehllc *ehllc; struct ip *ip; u_int16_t etype; int hlen, r, off = sizeof(struct ether_header); if (fr_checkp == NULL) return (BRIDGE_FILTER_PASS); if (m->m_len < sizeof(struct ehllc)) { m = m_pullup(m, sizeof(struct ehllc)); *np = m; if (m == NULL) return (BRIDGE_FILTER_DROP); } ehllc = mtod(m, struct ehllc *); etype = ntohs(ehllc->eh.ether_type); if (etype != ETHERTYPE_IP) { if (etype > ETHERMTU) /* Can't be SNAP */ return (BRIDGE_FILTER_PASS); if (ehllc->llc.llc_control != LLC_UI || ehllc->llc.llc_dsap != LLC_SNAP_LSAP || ehllc->llc.llc_ssap != LLC_SNAP_LSAP || ehllc->llc.llc_snap.org_code[0] != 0 || ehllc->llc.llc_snap.org_code[1] != 0 || ehllc->llc.llc_snap.org_code[2] != 0 || ntohs(ehllc->llc.llc_snap.ether_type) != ETHERTYPE_IP) return (BRIDGE_FILTER_PASS); off += 8; } /* * We need a full copy because we're going to be destructive * to the packet before we pass it to the ip filter code. * XXX This needs to be turned into a munge -> check -> * XXX unmunge section, for now, we copy. * XXX Copy at offset 0 so that the mbuf header is copied, too. */ m = m_copym2(m, 0, M_COPYALL, M_NOWAIT); m_adj(m, off); if (m == NULL) return (BRIDGE_FILTER_DROP); /* * Pull up the IP header */ if (m->m_len < sizeof(struct ip)) { m = m_pullup(m, sizeof(struct ip)); if (m == NULL) return (BRIDGE_FILTER_DROP); } /* * Examine the ip header, and drop invalid packets */ ip = mtod(m, struct ip *); if (ip->ip_v != IPVERSION) { r = BRIDGE_FILTER_DROP; goto out; } hlen = ip->ip_hl << 2; /* get whole header length */ if (hlen < sizeof(struct ip)) { r = BRIDGE_FILTER_DROP; goto out; } if (hlen > m->m_len) { /* pull up whole header */ if ((m = m_pullup(m, hlen)) == 0) { r = BRIDGE_FILTER_DROP; goto out; } ip = mtod(m, struct ip *); } if ((ip->ip_sum = in_cksum(m, hlen)) != 0) { r = BRIDGE_FILTER_DROP; goto out; } NTOHS(ip->ip_len); if (ip->ip_len < hlen) { r = BRIDGE_FILTER_DROP; goto out; } NTOHS(ip->ip_id); NTOHS(ip->ip_off); if (m->m_pkthdr.len < ip->ip_len) { r = BRIDGE_FILTER_DROP; goto out; } if (m->m_pkthdr.len > ip->ip_len) { if (m->m_len == m->m_pkthdr.len) { m->m_len = ip->ip_len; m->m_pkthdr.len = ip->ip_len; } else m_adj(m, ip->ip_len - m->m_pkthdr.len); } /* Finally, we get to filter the packet! */ if (fr_checkp && (*fr_checkp)(ip, hlen, ifp, 0, &m)) return (BRIDGE_FILTER_DROP); r = BRIDGE_FILTER_PASS; out: m_freem(m); return (r); } #endif #endif /* NBRIDGE */