/*- * 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: in_gif.c,v 1.54 2001/05/14 14:02:16 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 #include #include #include #ifdef INET6 #include #endif #include static int gif_validate4(const struct ip *, struct gif_softc *, struct ifnet *); static int in_gif_input(struct mbuf **, int *, int); static void in_gif_input10(struct mbuf *, int); extern struct domain inetdomain; static struct protosw in_gif_protosw = { .pr_type = SOCK_RAW, .pr_domain = &inetdomain, .pr_protocol = 0/* IPPROTO_IPV[46] */, .pr_flags = PR_ATOMIC|PR_ADDR, .pr_input = in_gif_input10, .pr_output = (pr_output_t*)rip_output, .pr_ctloutput = rip_ctloutput, .pr_usrreqs = &rip_usrreqs }; #define GIF_TTL 30 static VNET_DEFINE(int, ip_gif_ttl) = GIF_TTL; #define V_ip_gif_ttl VNET(ip_gif_ttl) SYSCTL_VNET_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW, &VNET_NAME(ip_gif_ttl), 0, ""); int in_gif_output(struct ifnet *ifp, struct mbuf *m, int proto, uint8_t ecn) { GIF_RLOCK_TRACKER; struct gif_softc *sc = ifp->if_softc; struct ip *ip; int len; /* prepend new IP header */ len = sizeof(struct ip); #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, ("in_gif_output: unexpected misalignment")); m->m_data += len; m->m_len -= ETHERIP_ALIGN; } #endif ip = mtod(m, struct ip *); GIF_RLOCK(sc); if (sc->gif_family != AF_INET) { m_freem(m); GIF_RUNLOCK(sc); return (ENETDOWN); } bcopy(sc->gif_iphdr, ip, sizeof(struct ip)); GIF_RUNLOCK(sc); ip->ip_p = proto; /* version will be set in ip_output() */ ip->ip_ttl = V_ip_gif_ttl; ip->ip_len = htons(m->m_pkthdr.len); ip->ip_tos = ecn; return (ip_output(m, NULL, NULL, 0, NULL, NULL)); } static void in_gif_input10(struct mbuf *m, int off) { int proto; proto = (mtod(m, struct ip *))->ip_p; in_gif_input(&m, &off, proto); } static int in_gif_input(struct mbuf **mp, int *offp, int proto) { struct mbuf *m = *mp; struct gif_softc *sc; struct ifnet *gifp; struct ip *ip; uint8_t ecn; sc = encap_getarg(m); if (sc == NULL) { m_freem(m); KMOD_IPSTAT_INC(ips_nogif); return (IPPROTO_DONE); } gifp = GIF2IFP(sc); if ((gifp->if_flags & IFF_UP) != 0) { ip = mtod(m, struct ip *); ecn = ip->ip_tos; m_adj(m, *offp); gif_input(m, gifp, proto, ecn); } else { m_freem(m); KMOD_IPSTAT_INC(ips_nogif); } return (IPPROTO_DONE); } /* * validate outer address. */ static int gif_validate4(const struct ip *ip, struct gif_softc *sc, struct ifnet *ifp) { int ret; GIF_RLOCK_ASSERT(sc); /* check for address match */ if (sc->gif_iphdr->ip_src.s_addr != ip->ip_dst.s_addr) return (0); ret = 32; if (sc->gif_iphdr->ip_dst.s_addr != ip->ip_src.s_addr) { if ((sc->gif_options & GIF_IGNORE_SOURCE) == 0) return (0); } else ret += 32; /* martian filters on outer source - NOT done in ip_input! */ if (IN_MULTICAST(ntohl(ip->ip_src.s_addr))) return (0); switch ((ntohl(ip->ip_src.s_addr) & 0xff000000) >> 24) { case 0: case 127: case 255: return (0); } /* ingress filters on outer source */ if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) { struct sockaddr_in sin; struct rtentry *rt; bzero(&sin, sizeof(sin)); sin.sin_family = AF_INET; sin.sin_len = sizeof(struct sockaddr_in); sin.sin_addr = ip->ip_src; /* XXX MRT check for the interface we would use on output */ rt = in_rtalloc1((struct sockaddr *)&sin, 0, 0UL, sc->gif_fibnum); if (!rt || rt->rt_ifp != ifp) { if (rt) RTFREE_LOCKED(rt); return (0); } RTFREE_LOCKED(rt); } return (ret); } /* * we know that we are in IFF_UP, outer address available, and outer family * matched the physical addr family. see gif_encapcheck(). */ int in_gif_encapcheck(const struct mbuf *m, int off, int proto, void *arg) { struct ip ip; 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(ip), (caddr_t)&ip); ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL; return (gif_validate4(&ip, sc, ifp)); } int in_gif_attach(struct gif_softc *sc) { KASSERT(sc->gif_ecookie == NULL, ("gif_ecookie isn't NULL")); sc->gif_ecookie = encap_attach_func(AF_INET, -1, gif_encapcheck, &in_gif_protosw, sc); if (sc->gif_ecookie == NULL) return (EEXIST); return (0); }