/* $FreeBSD$ */ /* $KAME: if_gif.c,v 1.87 2001/10/19 08:50:27 itojun Exp $ */ /*- * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * 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. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``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 PROJECT OR CONTRIBUTORS 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 "opt_inet.h" #include "opt_inet6.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef INET #include #include #include #endif /* INET */ #ifdef INET6 #ifndef INET #include #endif #include #include #include #include #include #include #endif /* INET6 */ #include #include #include #include #include static const char gifname[] = "gif"; /* * gif_mtx protects the global gif_softc_list. */ static struct mtx gif_mtx; static MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface"); static VNET_DEFINE(LIST_HEAD(, gif_softc), gif_softc_list); #define V_gif_softc_list VNET(gif_softc_list) void (*ng_gif_input_p)(struct ifnet *ifp, struct mbuf **mp, int af); void (*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af); void (*ng_gif_attach_p)(struct ifnet *ifp); void (*ng_gif_detach_p)(struct ifnet *ifp); static void gif_start(struct ifnet *); static int gif_clone_create(struct if_clone *, int, caddr_t); static void gif_clone_destroy(struct ifnet *); static struct if_clone *gif_cloner; static int gifmodevent(module_t, int, void *); SYSCTL_DECL(_net_link); static SYSCTL_NODE(_net_link, IFT_GIF, gif, CTLFLAG_RW, 0, "Generic Tunnel Interface"); #ifndef MAX_GIF_NEST /* * This macro controls the default upper limitation on nesting of gif tunnels. * Since, setting a large value to this macro with a careless configuration * may introduce system crash, we don't allow any nestings by default. * If you need to configure nested gif tunnels, you can define this macro * in your kernel configuration file. However, if you do so, please be * careful to configure the tunnels so that it won't make a loop. */ #define MAX_GIF_NEST 1 #endif static VNET_DEFINE(int, max_gif_nesting) = MAX_GIF_NEST; #define V_max_gif_nesting VNET(max_gif_nesting) SYSCTL_VNET_INT(_net_link_gif, OID_AUTO, max_nesting, CTLFLAG_RW, &VNET_NAME(max_gif_nesting), 0, "Max nested tunnels"); /* * By default, we disallow creation of multiple tunnels between the same * pair of addresses. Some applications require this functionality so * we allow control over this check here. */ #ifdef XBONEHACK static VNET_DEFINE(int, parallel_tunnels) = 1; #else static VNET_DEFINE(int, parallel_tunnels) = 0; #endif #define V_parallel_tunnels VNET(parallel_tunnels) SYSCTL_VNET_INT(_net_link_gif, OID_AUTO, parallel_tunnels, CTLFLAG_RW, &VNET_NAME(parallel_tunnels), 0, "Allow parallel tunnels?"); /* copy from src/sys/net/if_ethersubr.c */ static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; #ifndef ETHER_IS_BROADCAST #define ETHER_IS_BROADCAST(addr) \ (bcmp(etherbroadcastaddr, (addr), ETHER_ADDR_LEN) == 0) #endif static int gif_clone_create(ifc, unit, params) struct if_clone *ifc; int unit; caddr_t params; { struct gif_softc *sc; sc = malloc(sizeof(struct gif_softc), M_GIF, M_WAITOK | M_ZERO); sc->gif_fibnum = curthread->td_proc->p_fibnum; GIF2IFP(sc) = if_alloc(IFT_GIF); if (GIF2IFP(sc) == NULL) { free(sc, M_GIF); return (ENOSPC); } GIF_LOCK_INIT(sc); GIF2IFP(sc)->if_softc = sc; if_initname(GIF2IFP(sc), gifname, unit); sc->encap_cookie4 = sc->encap_cookie6 = NULL; sc->gif_options = GIF_ACCEPT_REVETHIP; GIF2IFP(sc)->if_addrlen = 0; GIF2IFP(sc)->if_mtu = GIF_MTU; GIF2IFP(sc)->if_flags = IFF_POINTOPOINT | IFF_MULTICAST; #if 0 /* turn off ingress filter */ GIF2IFP(sc)->if_flags |= IFF_LINK2; #endif GIF2IFP(sc)->if_ioctl = gif_ioctl; GIF2IFP(sc)->if_start = gif_start; GIF2IFP(sc)->if_output = gif_output; GIF2IFP(sc)->if_snd.ifq_maxlen = ifqmaxlen; if_attach(GIF2IFP(sc)); bpfattach(GIF2IFP(sc), DLT_NULL, sizeof(u_int32_t)); if (ng_gif_attach_p != NULL) (*ng_gif_attach_p)(GIF2IFP(sc)); mtx_lock(&gif_mtx); LIST_INSERT_HEAD(&V_gif_softc_list, sc, gif_list); mtx_unlock(&gif_mtx); return (0); } static void gif_clone_destroy(ifp) struct ifnet *ifp; { #if defined(INET) || defined(INET6) int err; #endif struct gif_softc *sc = ifp->if_softc; mtx_lock(&gif_mtx); LIST_REMOVE(sc, gif_list); mtx_unlock(&gif_mtx); gif_delete_tunnel(ifp); #ifdef INET6 if (sc->encap_cookie6 != NULL) { err = encap_detach(sc->encap_cookie6); KASSERT(err == 0, ("Unexpected error detaching encap_cookie6")); } #endif #ifdef INET if (sc->encap_cookie4 != NULL) { err = encap_detach(sc->encap_cookie4); KASSERT(err == 0, ("Unexpected error detaching encap_cookie4")); } #endif if (ng_gif_detach_p != NULL) (*ng_gif_detach_p)(ifp); bpfdetach(ifp); if_detach(ifp); if_free(ifp); GIF_LOCK_DESTROY(sc); free(sc, M_GIF); } static void vnet_gif_init(const void *unused __unused) { LIST_INIT(&V_gif_softc_list); } VNET_SYSINIT(vnet_gif_init, SI_SUB_PSEUDO, SI_ORDER_MIDDLE, vnet_gif_init, NULL); static int gifmodevent(mod, type, data) module_t mod; int type; void *data; { switch (type) { case MOD_LOAD: mtx_init(&gif_mtx, "gif_mtx", NULL, MTX_DEF); gif_cloner = if_clone_simple(gifname, gif_clone_create, gif_clone_destroy, 0); break; case MOD_UNLOAD: if_clone_detach(gif_cloner); mtx_destroy(&gif_mtx); break; default: return EOPNOTSUPP; } return 0; } static moduledata_t gif_mod = { "if_gif", gifmodevent, 0 }; DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); MODULE_VERSION(if_gif, 1); int gif_encapcheck(m, off, proto, arg) const struct mbuf *m; int off; int proto; void *arg; { struct ip ip; struct gif_softc *sc; sc = (struct gif_softc *)arg; if (sc == NULL) return 0; if ((GIF2IFP(sc)->if_flags & IFF_UP) == 0) return 0; /* no physical address */ if (!sc->gif_psrc || !sc->gif_pdst) return 0; switch (proto) { #ifdef INET case IPPROTO_IPV4: break; #endif #ifdef INET6 case IPPROTO_IPV6: break; #endif case IPPROTO_ETHERIP: break; default: return 0; } /* Bail on short packets */ if (m->m_pkthdr.len < sizeof(ip)) return 0; m_copydata(m, 0, sizeof(ip), (caddr_t)&ip); switch (ip.ip_v) { #ifdef INET case 4: if (sc->gif_psrc->sa_family != AF_INET || sc->gif_pdst->sa_family != AF_INET) return 0; return gif_encapcheck4(m, off, proto, arg); #endif #ifdef INET6 case 6: if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) return 0; if (sc->gif_psrc->sa_family != AF_INET6 || sc->gif_pdst->sa_family != AF_INET6) return 0; return gif_encapcheck6(m, off, proto, arg); #endif default: return 0; } } #ifdef INET #define GIF_HDR_LEN (ETHER_HDR_LEN + sizeof (struct ip)) #endif #ifdef INET6 #define GIF_HDR_LEN6 (ETHER_HDR_LEN + sizeof (struct ip6_hdr)) #endif static void gif_start(struct ifnet *ifp) { struct gif_softc *sc; struct mbuf *m; uint32_t af; int error = 0; sc = ifp->if_softc; GIF_LOCK(sc); ifp->if_drv_flags |= IFF_DRV_OACTIVE; while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) { IFQ_DRV_DEQUEUE(&ifp->if_snd, m); if (m == 0) break; #ifdef ALTQ /* Take out those altq bytes we add in gif_output */ #ifdef INET if (sc->gif_psrc->sa_family == AF_INET) m->m_pkthdr.len -= GIF_HDR_LEN; #endif #ifdef INET6 if (sc->gif_psrc->sa_family == AF_INET6) m->m_pkthdr.len -= GIF_HDR_LEN6; #endif #endif /* * Now pull back the af that we * stashed in the csum_data. */ af = m->m_pkthdr.csum_data; if (ifp->if_bridge) af = AF_LINK; BPF_MTAP2(ifp, &af, sizeof(af), m); ifp->if_opackets++; /* Done by IFQ_HANDOFF */ /* ifp->if_obytes += m->m_pkthdr.len;*/ /* override to IPPROTO_ETHERIP for bridged traffic */ M_SETFIB(m, sc->gif_fibnum); /* inner AF-specific encapsulation */ /* XXX should we check if our outer source is legal? */ /* dispatch to output logic based on outer AF */ switch (sc->gif_psrc->sa_family) { #ifdef INET case AF_INET: error = in_gif_output(ifp, af, m); break; #endif #ifdef INET6 case AF_INET6: error = in6_gif_output(ifp, af, m); break; #endif default: m_freem(m); error = ENETDOWN; } if (error) ifp->if_oerrors++; } ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; GIF_UNLOCK(sc); return; } int gif_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, struct route *ro) { struct gif_softc *sc = ifp->if_softc; struct m_tag *mtag; int error = 0; int gif_called; uint32_t af; #ifdef MAC error = mac_ifnet_check_transmit(ifp, m); if (error) { m_freem(m); goto end; } #endif /* * gif may cause infinite recursion calls when misconfigured. * We'll prevent this by detecting loops. * * High nesting level may cause stack exhaustion. * We'll prevent this by introducing upper limit. */ gif_called = 1; mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, NULL); while (mtag != NULL) { if (*(struct ifnet **)(mtag + 1) == ifp) { log(LOG_NOTICE, "gif_output: loop detected on %s\n", (*(struct ifnet **)(mtag + 1))->if_xname); m_freem(m); error = EIO; /* is there better errno? */ goto end; } mtag = m_tag_locate(m, MTAG_GIF, MTAG_GIF_CALLED, mtag); gif_called++; } if (gif_called > V_max_gif_nesting) { log(LOG_NOTICE, "gif_output: recursively called too many times(%d)\n", gif_called); m_freem(m); error = EIO; /* is there better errno? */ goto end; } mtag = m_tag_alloc(MTAG_GIF, MTAG_GIF_CALLED, sizeof(struct ifnet *), M_NOWAIT); if (mtag == NULL) { m_freem(m); error = ENOMEM; goto end; } *(struct ifnet **)(mtag + 1) = ifp; m_tag_prepend(m, mtag); m->m_flags &= ~(M_BCAST|M_MCAST); /* BPF writes need to be handled specially. */ if (dst->sa_family == AF_UNSPEC) bcopy(dst->sa_data, &af, sizeof(af)); else af = dst->sa_family; /* * Now save the af in the inbound pkt csum * data, this is a cheat since we are using * the inbound csum_data field to carry the * af over to the gif_start() routine, avoiding * using yet another mtag. */ m->m_pkthdr.csum_data = af; if (!(ifp->if_flags & IFF_UP) || sc->gif_psrc == NULL || sc->gif_pdst == NULL) { m_freem(m); error = ENETDOWN; goto end; } #ifdef ALTQ /* * Make altq aware of the bytes we will add * when we actually send it. */ #ifdef INET if (sc->gif_psrc->sa_family == AF_INET) m->m_pkthdr.len += GIF_HDR_LEN; #endif #ifdef INET6 if (sc->gif_psrc->sa_family == AF_INET6) m->m_pkthdr.len += GIF_HDR_LEN6; #endif #endif /* * Queue message on interface, update output statistics if * successful, and start output if interface not yet active. */ IFQ_HANDOFF(ifp, m, error); end: if (error) ifp->if_oerrors++; return (error); } void gif_input(m, af, ifp) struct mbuf *m; int af; struct ifnet *ifp; { int isr, n; struct gif_softc *sc; struct etherip_header *eip; struct ether_header *eh; struct ifnet *oldifp; if (ifp == NULL) { /* just in case */ m_freem(m); return; } sc = ifp->if_softc; m->m_pkthdr.rcvif = ifp; #ifdef MAC mac_ifnet_create_mbuf(ifp, m); #endif if (bpf_peers_present(ifp->if_bpf)) { u_int32_t af1 = af; bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m); } if (ng_gif_input_p != NULL) { (*ng_gif_input_p)(ifp, &m, af); if (m == NULL) return; } /* * Put the packet to the network layer input queue according to the * specified address family. * Note: older versions of gif_input directly called network layer * input functions, e.g. ip6_input, here. We changed the policy to * prevent too many recursive calls of such input functions, which * might cause kernel panic. But the change may introduce another * problem; if the input queue is full, packets are discarded. * The kernel stack overflow really happened, and we believed * queue-full rarely occurs, so we changed the policy. */ switch (af) { #ifdef INET case AF_INET: isr = NETISR_IP; break; #endif #ifdef INET6 case AF_INET6: isr = NETISR_IPV6; break; #endif case AF_LINK: n = sizeof(struct etherip_header) + sizeof(struct ether_header); if (n > m->m_len) { m = m_pullup(m, n); if (m == NULL) { ifp->if_ierrors++; return; } } eip = mtod(m, struct etherip_header *); /* * GIF_ACCEPT_REVETHIP (enabled by default) intentionally * accepts an EtherIP packet with revered version field in * the header. This is a knob for backward compatibility * with FreeBSD 7.2R or prior. */ if (sc->gif_options & GIF_ACCEPT_REVETHIP) { if (eip->eip_resvl != ETHERIP_VERSION && eip->eip_ver != ETHERIP_VERSION) { /* discard unknown versions */ m_freem(m); return; } } else { if (eip->eip_ver != ETHERIP_VERSION) { /* discard unknown versions */ m_freem(m); return; } } m_adj(m, sizeof(struct etherip_header)); m->m_flags &= ~(M_BCAST|M_MCAST); m->m_pkthdr.rcvif = ifp; if (ifp->if_bridge) { oldifp = ifp; eh = mtod(m, struct ether_header *); if (ETHER_IS_MULTICAST(eh->ether_dhost)) { if (ETHER_IS_BROADCAST(eh->ether_dhost)) m->m_flags |= M_BCAST; else m->m_flags |= M_MCAST; ifp->if_imcasts++; } BRIDGE_INPUT(ifp, m); if (m != NULL && ifp != oldifp) { /* * The bridge gave us back itself or one of the * members for which the frame is addressed. */ ether_demux(ifp, m); return; } } if (m != NULL) m_freem(m); return; default: if (ng_gif_input_orphan_p != NULL) (*ng_gif_input_orphan_p)(ifp, m, af); else m_freem(m); return; } ifp->if_ipackets++; ifp->if_ibytes += m->m_pkthdr.len; M_SETFIB(m, ifp->if_fib); netisr_dispatch(isr, m); } /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ int gif_ioctl(ifp, cmd, data) struct ifnet *ifp; u_long cmd; caddr_t data; { struct gif_softc *sc = ifp->if_softc; struct ifreq *ifr = (struct ifreq*)data; int error = 0, size; u_int options; struct sockaddr *dst, *src; #ifdef SIOCSIFMTU /* xxx */ u_long mtu; #endif switch (cmd) { case SIOCSIFADDR: ifp->if_flags |= IFF_UP; break; case SIOCSIFDSTADDR: break; case SIOCADDMULTI: case SIOCDELMULTI: break; #ifdef SIOCSIFMTU /* xxx */ case SIOCGIFMTU: break; case SIOCSIFMTU: mtu = ifr->ifr_mtu; if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) return (EINVAL); ifp->if_mtu = mtu; break; #endif /* SIOCSIFMTU */ #ifdef INET case SIOCSIFPHYADDR: #endif #ifdef INET6 case SIOCSIFPHYADDR_IN6: #endif /* INET6 */ case SIOCSLIFPHYADDR: switch (cmd) { #ifdef INET case SIOCSIFPHYADDR: src = (struct sockaddr *) &(((struct in_aliasreq *)data)->ifra_addr); dst = (struct sockaddr *) &(((struct in_aliasreq *)data)->ifra_dstaddr); break; #endif #ifdef INET6 case SIOCSIFPHYADDR_IN6: src = (struct sockaddr *) &(((struct in6_aliasreq *)data)->ifra_addr); dst = (struct sockaddr *) &(((struct in6_aliasreq *)data)->ifra_dstaddr); break; #endif case SIOCSLIFPHYADDR: src = (struct sockaddr *) &(((struct if_laddrreq *)data)->addr); dst = (struct sockaddr *) &(((struct if_laddrreq *)data)->dstaddr); break; default: return EINVAL; } /* sa_family must be equal */ if (src->sa_family != dst->sa_family) return EINVAL; /* validate sa_len */ switch (src->sa_family) { #ifdef INET case AF_INET: if (src->sa_len != sizeof(struct sockaddr_in)) return EINVAL; break; #endif #ifdef INET6 case AF_INET6: if (src->sa_len != sizeof(struct sockaddr_in6)) return EINVAL; break; #endif default: return EAFNOSUPPORT; } switch (dst->sa_family) { #ifdef INET case AF_INET: if (dst->sa_len != sizeof(struct sockaddr_in)) return EINVAL; break; #endif #ifdef INET6 case AF_INET6: if (dst->sa_len != sizeof(struct sockaddr_in6)) return EINVAL; break; #endif default: return EAFNOSUPPORT; } /* check sa_family looks sane for the cmd */ switch (cmd) { case SIOCSIFPHYADDR: if (src->sa_family == AF_INET) break; return EAFNOSUPPORT; #ifdef INET6 case SIOCSIFPHYADDR_IN6: if (src->sa_family == AF_INET6) break; return EAFNOSUPPORT; #endif /* INET6 */ case SIOCSLIFPHYADDR: /* checks done in the above */ break; } error = gif_set_tunnel(GIF2IFP(sc), src, dst); break; #ifdef SIOCDIFPHYADDR case SIOCDIFPHYADDR: gif_delete_tunnel(GIF2IFP(sc)); break; #endif case SIOCGIFPSRCADDR: #ifdef INET6 case SIOCGIFPSRCADDR_IN6: #endif /* INET6 */ if (sc->gif_psrc == NULL) { error = EADDRNOTAVAIL; goto bad; } src = sc->gif_psrc; switch (cmd) { #ifdef INET case SIOCGIFPSRCADDR: dst = &ifr->ifr_addr; size = sizeof(ifr->ifr_addr); break; #endif /* INET */ #ifdef INET6 case SIOCGIFPSRCADDR_IN6: dst = (struct sockaddr *) &(((struct in6_ifreq *)data)->ifr_addr); size = sizeof(((struct in6_ifreq *)data)->ifr_addr); break; #endif /* INET6 */ default: error = EADDRNOTAVAIL; goto bad; } if (src->sa_len > size) return EINVAL; bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); #ifdef INET6 if (dst->sa_family == AF_INET6) { error = sa6_recoverscope((struct sockaddr_in6 *)dst); if (error != 0) return (error); } #endif break; case SIOCGIFPDSTADDR: #ifdef INET6 case SIOCGIFPDSTADDR_IN6: #endif /* INET6 */ if (sc->gif_pdst == NULL) { error = EADDRNOTAVAIL; goto bad; } src = sc->gif_pdst; switch (cmd) { #ifdef INET case SIOCGIFPDSTADDR: dst = &ifr->ifr_addr; size = sizeof(ifr->ifr_addr); break; #endif /* INET */ #ifdef INET6 case SIOCGIFPDSTADDR_IN6: dst = (struct sockaddr *) &(((struct in6_ifreq *)data)->ifr_addr); size = sizeof(((struct in6_ifreq *)data)->ifr_addr); break; #endif /* INET6 */ default: error = EADDRNOTAVAIL; goto bad; } if (src->sa_len > size) return EINVAL; error = prison_if(curthread->td_ucred, src); if (error != 0) return (error); error = prison_if(curthread->td_ucred, dst); if (error != 0) return (error); bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); #ifdef INET6 if (dst->sa_family == AF_INET6) { error = sa6_recoverscope((struct sockaddr_in6 *)dst); if (error != 0) return (error); } #endif break; case SIOCGLIFPHYADDR: if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { error = EADDRNOTAVAIL; goto bad; } /* copy src */ src = sc->gif_psrc; dst = (struct sockaddr *) &(((struct if_laddrreq *)data)->addr); size = sizeof(((struct if_laddrreq *)data)->addr); if (src->sa_len > size) return EINVAL; bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); /* copy dst */ src = sc->gif_pdst; dst = (struct sockaddr *) &(((struct if_laddrreq *)data)->dstaddr); size = sizeof(((struct if_laddrreq *)data)->dstaddr); if (src->sa_len > size) return EINVAL; bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); break; case SIOCSIFFLAGS: /* if_ioctl() takes care of it */ break; case GIFGOPTS: options = sc->gif_options; error = copyout(&options, ifr->ifr_data, sizeof(options)); break; case GIFSOPTS: if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0) break; error = copyin(ifr->ifr_data, &options, sizeof(options)); if (error) break; if (options & ~GIF_OPTMASK) error = EINVAL; else sc->gif_options = options; break; default: error = EINVAL; break; } bad: return error; } /* * XXXRW: There's a general event-ordering issue here: the code to check * if a given tunnel is already present happens before we perform a * potentially blocking setup of the tunnel. This code needs to be * re-ordered so that the check and replacement can be atomic using * a mutex. */ int gif_set_tunnel(ifp, src, dst) struct ifnet *ifp; struct sockaddr *src; struct sockaddr *dst; { struct gif_softc *sc = ifp->if_softc; struct gif_softc *sc2; struct sockaddr *osrc, *odst, *sa; int error = 0; mtx_lock(&gif_mtx); LIST_FOREACH(sc2, &V_gif_softc_list, gif_list) { if (sc2 == sc) continue; if (!sc2->gif_pdst || !sc2->gif_psrc) continue; if (sc2->gif_pdst->sa_family != dst->sa_family || sc2->gif_pdst->sa_len != dst->sa_len || sc2->gif_psrc->sa_family != src->sa_family || sc2->gif_psrc->sa_len != src->sa_len) continue; /* * Disallow parallel tunnels unless instructed * otherwise. */ if (!V_parallel_tunnels && bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { error = EADDRNOTAVAIL; mtx_unlock(&gif_mtx); goto bad; } /* XXX both end must be valid? (I mean, not 0.0.0.0) */ } mtx_unlock(&gif_mtx); /* XXX we can detach from both, but be polite just in case */ if (sc->gif_psrc) switch (sc->gif_psrc->sa_family) { #ifdef INET case AF_INET: (void)in_gif_detach(sc); break; #endif #ifdef INET6 case AF_INET6: (void)in6_gif_detach(sc); break; #endif } osrc = sc->gif_psrc; sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK); bcopy((caddr_t)src, (caddr_t)sa, src->sa_len); sc->gif_psrc = sa; odst = sc->gif_pdst; sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK); bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len); sc->gif_pdst = sa; switch (sc->gif_psrc->sa_family) { #ifdef INET case AF_INET: error = in_gif_attach(sc); break; #endif #ifdef INET6 case AF_INET6: /* * Check validity of the scope zone ID of the addresses, and * convert it into the kernel internal form if necessary. */ error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_psrc, 0); if (error != 0) break; error = sa6_embedscope((struct sockaddr_in6 *)sc->gif_pdst, 0); if (error != 0) break; error = in6_gif_attach(sc); break; #endif } if (error) { /* rollback */ free((caddr_t)sc->gif_psrc, M_IFADDR); free((caddr_t)sc->gif_pdst, M_IFADDR); sc->gif_psrc = osrc; sc->gif_pdst = odst; goto bad; } if (osrc) free((caddr_t)osrc, M_IFADDR); if (odst) free((caddr_t)odst, M_IFADDR); bad: if (sc->gif_psrc && sc->gif_pdst) ifp->if_drv_flags |= IFF_DRV_RUNNING; else ifp->if_drv_flags &= ~IFF_DRV_RUNNING; return error; } void gif_delete_tunnel(ifp) struct ifnet *ifp; { struct gif_softc *sc = ifp->if_softc; if (sc->gif_psrc) { free((caddr_t)sc->gif_psrc, M_IFADDR); sc->gif_psrc = NULL; } if (sc->gif_pdst) { free((caddr_t)sc->gif_pdst, M_IFADDR); sc->gif_pdst = NULL; } /* it is safe to detach from both */ #ifdef INET (void)in_gif_detach(sc); #endif #ifdef INET6 (void)in6_gif_detach(sc); #endif ifp->if_drv_flags &= ~IFF_DRV_RUNNING; }