/*- * 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 #include #include #include #include #include #ifdef INET #include #endif #include #ifdef INET6 #include #include #include #include #include #endif #include #ifdef INET6 #include #endif #include #include VNET_DEFINE(int, ip6_gif_hlim) = GIF_HLIM; #define V_ip6_gif_hlim VNET(ip6_gif_hlim) SYSCTL_DECL(_net_inet6_ip6); SYSCTL_VNET_INT(_net_inet6_ip6, IPV6CTL_GIF_HLIM, gifhlim, CTLFLAG_RW, &VNET_NAME(ip6_gif_hlim), 0, ""); static int gif_validate6(const struct ip6_hdr *, struct gif_softc *, struct ifnet *); extern struct domain inet6domain; struct protosw in6_gif_protosw = { .pr_type = SOCK_RAW, .pr_domain = &inet6domain, .pr_protocol = 0, /* IPPROTO_IPV[46] */ .pr_flags = PR_ATOMIC|PR_ADDR, .pr_input = in6_gif_input, .pr_output = rip6_output, .pr_ctloutput = rip6_ctloutput, .pr_usrreqs = &rip6_usrreqs }; int in6_gif_output(struct ifnet *ifp, struct mbuf *m, int proto, uint8_t ecn) { GIF_RLOCK_TRACKER; struct gif_softc *sc = ifp->if_softc; struct ip6_hdr *ip6; int len; /* prepend new IP header */ len = sizeof(struct ip6_hdr); #ifndef __NO_STRICT_ALIGNMENT if (proto == IPPROTO_ETHERIP) len += ETHERIP_ALIGN; #endif M_PREPEND(m, len, M_NOWAIT); if (m == NULL) return (ENOBUFS); #ifndef __NO_STRICT_ALIGNMENT if (proto == IPPROTO_ETHERIP) { len = mtod(m, vm_offset_t) & 3; KASSERT(len == 0 || len == ETHERIP_ALIGN, ("in6_gif_output: unexpected misalignment")); m->m_data += len; m->m_len -= ETHERIP_ALIGN; } #endif ip6 = mtod(m, struct ip6_hdr *); GIF_RLOCK(sc); if (sc->gif_family != AF_INET6) { m_freem(m); GIF_RUNLOCK(sc); return (ENETDOWN); } bcopy(sc->gif_ip6hdr, ip6, sizeof(struct ip6_hdr)); GIF_RUNLOCK(sc); ip6->ip6_flow |= htonl((uint32_t)ecn << 20); ip6->ip6_nxt = proto; ip6->ip6_hlim = V_ip6_gif_hlim; /* * 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. */ return (ip6_output(m, 0, NULL, IPV6_MINMTU, 0, NULL)); } int in6_gif_input(struct mbuf **mp, int *offp, int proto) { struct mbuf *m = *mp; struct ifnet *gifp; struct gif_softc *sc; struct ip6_hdr *ip6; uint8_t ecn; sc = encap_getarg(m); if (sc == NULL) { m_freem(m); IP6STAT_INC(ip6s_nogif); return (IPPROTO_DONE); } gifp = GIF2IFP(sc); if ((gifp->if_flags & IFF_UP) != 0) { ip6 = mtod(m, struct ip6_hdr *); ecn = (ntohl(ip6->ip6_flow) >> 20) & 0xff; m_adj(m, *offp); gif_input(m, gifp, proto, ecn); } else { m_freem(m); IP6STAT_INC(ip6s_nogif); } return (IPPROTO_DONE); } /* * validate outer address. */ static int gif_validate6(const struct ip6_hdr *ip6, struct gif_softc *sc, struct ifnet *ifp) { GIF_RLOCK_ASSERT(sc); /* * 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(&sc->gif_ip6hdr->ip6_src, &ip6->ip6_dst) || !IN6_ARE_ADDR_EQUAL(&sc->gif_ip6hdr->ip6_dst, &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 nhop6_basic nh6; struct in6_addr src; uint32_t fibnum, scopeid; fibnum = sc->gif_fibnum; in6_splitscope(&ip6->ip6_src, &src, &scopeid); if (fib6_lookup_nh_basic(fibnum, &src, scopeid, 0, &nh6) != 0) return (0); if (nh6.nh_ifp != ifp) return (0); } 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(). */ int in6_gif_encapcheck(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; GIF_RLOCK_ASSERT(sc); 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) { KASSERT(sc->gif_ecookie == NULL, ("gif_ecookie isn't NULL")); sc->gif_ecookie = encap_attach_func(AF_INET6, -1, gif_encapcheck, (void *)&in6_gif_protosw, sc); if (sc->gif_ecookie == NULL) return (EEXIST); return (0); }