/*- * 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. * * $KAME: in6_gif.c,v 1.49 2001/05/14 14:02:17 itojun Exp $ */ #include __FBSDID("$FreeBSD$"); #include "opt_inet.h" #include "opt_inet6.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef INET #include #endif #include #ifdef INET6 #include #include #include #include #endif #include #include #ifdef INET6 #include #endif #include static int gif_validate6(const struct ip6_hdr *, struct gif_softc *, struct ifnet *); extern struct domain inet6domain; struct ip6protosw in6_gif_protosw = { SOCK_RAW, &inet6domain, 0/* IPPROTO_IPV[46] */, PR_ATOMIC|PR_ADDR, in6_gif_input, rip6_output, 0, rip6_ctloutput, 0, 0, 0, 0, 0, &rip6_usrreqs }; int in6_gif_output(struct ifnet *ifp, int family, /* family of the packet to be encapsulate */ struct mbuf *m) { struct gif_softc *sc = ifp->if_softc; struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst; struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc; struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst; struct ip6_hdr *ip6; struct etherip_header eiphdr; int proto, error; u_int8_t itos, otos; GIF_LOCK_ASSERT(sc); if (sin6_src == NULL || sin6_dst == NULL || sin6_src->sin6_family != AF_INET6 || sin6_dst->sin6_family != AF_INET6) { m_freem(m); return EAFNOSUPPORT; } switch (family) { #ifdef INET case AF_INET: { struct ip *ip; proto = IPPROTO_IPV4; if (m->m_len < sizeof(*ip)) { m = m_pullup(m, sizeof(*ip)); if (!m) return ENOBUFS; } ip = mtod(m, struct ip *); itos = ip->ip_tos; break; } #endif #ifdef INET6 case AF_INET6: { struct ip6_hdr *ip6; proto = IPPROTO_IPV6; if (m->m_len < sizeof(*ip6)) { m = m_pullup(m, sizeof(*ip6)); if (!m) return ENOBUFS; } ip6 = mtod(m, struct ip6_hdr *); itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; break; } #endif case AF_LINK: proto = IPPROTO_ETHERIP; eiphdr.eip_ver = ETHERIP_VERSION & ETHERIP_VER_VERS_MASK; eiphdr.eip_pad = 0; /* prepend Ethernet-in-IP header */ M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT); if (m && m->m_len < sizeof(struct etherip_header)) m = m_pullup(m, sizeof(struct etherip_header)); if (m == NULL) return ENOBUFS; bcopy(&eiphdr, mtod(m, struct etherip_header *), sizeof(struct etherip_header)); break; default: #ifdef DEBUG printf("in6_gif_output: warning: unknown family %d passed\n", family); #endif m_freem(m); return EAFNOSUPPORT; } /* prepend new IP header */ M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT); if (m && m->m_len < sizeof(struct ip6_hdr)) m = m_pullup(m, sizeof(struct ip6_hdr)); if (m == NULL) { printf("ENOBUFS in in6_gif_output %d\n", __LINE__); return ENOBUFS; } ip6 = mtod(m, struct ip6_hdr *); ip6->ip6_flow = 0; ip6->ip6_vfc &= ~IPV6_VERSION_MASK; ip6->ip6_vfc |= IPV6_VERSION; ip6->ip6_plen = htons((u_short)m->m_pkthdr.len); ip6->ip6_nxt = proto; ip6->ip6_hlim = V_ip6_gif_hlim; ip6->ip6_src = sin6_src->sin6_addr; /* bidirectional configured tunnel mode */ if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr)) ip6->ip6_dst = sin6_dst->sin6_addr; else { m_freem(m); return ENETUNREACH; } ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE, &otos, &itos); ip6->ip6_flow &= ~htonl(0xff << 20); ip6->ip6_flow |= htonl((u_int32_t)otos << 20); if (dst->sin6_family != sin6_dst->sin6_family || !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) { /* cache route doesn't match */ bzero(dst, sizeof(*dst)); dst->sin6_family = sin6_dst->sin6_family; dst->sin6_len = sizeof(struct sockaddr_in6); dst->sin6_addr = sin6_dst->sin6_addr; if (sc->gif_ro6.ro_rt) { RTFREE(sc->gif_ro6.ro_rt); sc->gif_ro6.ro_rt = NULL; } #if 0 GIF2IFP(sc)->if_mtu = GIF_MTU; #endif } if (sc->gif_ro6.ro_rt == NULL) { rtalloc((struct route *)&sc->gif_ro6); if (sc->gif_ro6.ro_rt == NULL) { m_freem(m); return ENETUNREACH; } /* if it constitutes infinite encapsulation, punt. */ if (sc->gif_ro.ro_rt->rt_ifp == ifp) { m_freem(m); return ENETUNREACH; /*XXX*/ } #if 0 ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu - sizeof(struct ip6_hdr); #endif } #ifdef IPV6_MINMTU /* * force fragmentation to minimum MTU, to avoid path MTU discovery. * it is too painful to ask for resend of inner packet, to achieve * path MTU discovery for encapsulated packets. */ error = ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL); #else error = ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL); #endif if (!(GIF2IFP(sc)->if_flags & IFF_LINK0) && sc->gif_ro6.ro_rt != NULL) { RTFREE(sc->gif_ro6.ro_rt); sc->gif_ro6.ro_rt = NULL; } return (error); } int in6_gif_input(struct mbuf **mp, int *offp, int proto) { struct mbuf *m = *mp; struct ifnet *gifp = NULL; struct gif_softc *sc; struct ip6_hdr *ip6; int af = 0; u_int32_t otos; ip6 = mtod(m, struct ip6_hdr *); sc = (struct gif_softc *)encap_getarg(m); if (sc == NULL) { m_freem(m); V_ip6stat.ip6s_nogif++; return IPPROTO_DONE; } gifp = GIF2IFP(sc); if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) { m_freem(m); V_ip6stat.ip6s_nogif++; return IPPROTO_DONE; } otos = ip6->ip6_flow; m_adj(m, *offp); switch (proto) { #ifdef INET case IPPROTO_IPV4: { struct ip *ip; u_int8_t otos8; af = AF_INET; otos8 = (ntohl(otos) >> 20) & 0xff; if (m->m_len < sizeof(*ip)) { m = m_pullup(m, sizeof(*ip)); if (!m) return IPPROTO_DONE; } ip = mtod(m, struct ip *); if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE, &otos8, &ip->ip_tos) == 0) { m_freem(m); return IPPROTO_DONE; } break; } #endif /* INET */ #ifdef INET6 case IPPROTO_IPV6: { struct ip6_hdr *ip6; af = AF_INET6; if (m->m_len < sizeof(*ip6)) { m = m_pullup(m, sizeof(*ip6)); if (!m) return IPPROTO_DONE; } ip6 = mtod(m, struct ip6_hdr *); if (ip6_ecn_egress((gifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE, &otos, &ip6->ip6_flow) == 0) { m_freem(m); return IPPROTO_DONE; } break; } #endif case IPPROTO_ETHERIP: af = AF_LINK; break; default: V_ip6stat.ip6s_nogif++; m_freem(m); return IPPROTO_DONE; } gif_input(m, af, gifp); return IPPROTO_DONE; } /* * validate outer address. */ static int gif_validate6(const struct ip6_hdr *ip6, struct gif_softc *sc, struct ifnet *ifp) { struct sockaddr_in6 *src, *dst; src = (struct sockaddr_in6 *)sc->gif_psrc; dst = (struct sockaddr_in6 *)sc->gif_pdst; /* * Check for address match. Note that the check is for an incoming * packet. We should compare the *source* address in our configuration * and the *destination* address of the packet, and vice versa. */ if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) || !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src)) return 0; /* martian filters on outer source - done in ip6_input */ /* ingress filters on outer source */ if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) { struct sockaddr_in6 sin6; struct rtentry *rt; bzero(&sin6, sizeof(sin6)); sin6.sin6_family = AF_INET6; sin6.sin6_len = sizeof(struct sockaddr_in6); sin6.sin6_addr = ip6->ip6_src; sin6.sin6_scope_id = 0; /* XXX */ rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); if (!rt || rt->rt_ifp != ifp) { #if 0 char ip6buf[INET6_ADDRSTRLEN]; log(LOG_WARNING, "%s: packet from %s dropped " "due to ingress filter\n", if_name(GIF2IFP(sc)), ip6_sprintf(ip6buf, &sin6.sin6_addr)); #endif if (rt) rtfree(rt); return 0; } rtfree(rt); } return 128 * 2; } /* * we know that we are in IFF_UP, outer address available, and outer family * matched the physical addr family. see gif_encapcheck(). * sanity check for arg should have been done in the caller. */ int gif_encapcheck6(const struct mbuf *m, int off, int proto, void *arg) { struct ip6_hdr ip6; struct gif_softc *sc; struct ifnet *ifp; /* sanity check done in caller */ sc = (struct gif_softc *)arg; /* LINTED const cast */ m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6); ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL; return gif_validate6(&ip6, sc, ifp); } int in6_gif_attach(struct gif_softc *sc) { sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck, (void *)&in6_gif_protosw, sc); if (sc->encap_cookie6 == NULL) return EEXIST; return 0; } int in6_gif_detach(struct gif_softc *sc) { int error; error = encap_detach(sc->encap_cookie6); if (error == 0) sc->encap_cookie6 = NULL; return error; }