264 lines
6.5 KiB
C
264 lines
6.5 KiB
C
/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* in6_gif.c
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*/
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#include "opt_inet.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/mbuf.h>
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#include <sys/errno.h>
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#include <sys/protosw.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#ifdef INET
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#include <netinet/ip.h>
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#endif
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#include <netinet6/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/in6_gif.h>
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#include <netinet6/ip6.h>
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#include <net/if_gif.h>
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#include <net/net_osdep.h>
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int
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in6_gif_output(ifp, family, m, rt)
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struct ifnet *ifp;
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int family; /* family of the packet to be encapsulate. */
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struct mbuf *m;
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struct rtentry *rt;
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{
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struct gif_softc *sc = (struct gif_softc*)ifp;
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struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst;
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struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc;
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struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst;
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struct ip6_hdr *ip6;
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int proto;
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if (sin6_src == NULL || sin6_dst == NULL ||
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sin6_src->sin6_family != AF_INET6 ||
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sin6_dst->sin6_family != AF_INET6) {
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m_freem(m);
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return EAFNOSUPPORT;
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}
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switch (family) {
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#ifdef INET
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case AF_INET:
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{
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struct ip *ip;
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proto = IPPROTO_IPV4;
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if (m->m_len < sizeof(*ip)) {
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m = m_pullup(m, sizeof(*ip));
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if (!m)
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return ENOBUFS;
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}
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ip = mtod(m, struct ip *);
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break;
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}
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#endif
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case AF_INET6:
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{
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struct ip6_hdr *ip6;
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proto = IPPROTO_IPV6;
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if (m->m_len < sizeof(*ip6)) {
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m = m_pullup(m, sizeof(*ip6));
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if (!m)
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return ENOBUFS;
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}
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ip6 = mtod(m, struct ip6_hdr *);
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break;
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}
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default:
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#ifdef DIAGNOSTIC
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printf("in6_gif_output: warning: unknown family %d passed\n",
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family);
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#endif
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m_freem(m);
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return EAFNOSUPPORT;
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}
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/* prepend new IP header */
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M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT);
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if (m && m->m_len < sizeof(struct ip6_hdr))
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m = m_pullup(m, sizeof(struct ip6_hdr));
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if (m == NULL) {
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printf("ENOBUFS in in6_gif_output %d\n", __LINE__);
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return ENOBUFS;
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}
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ip6 = mtod(m, struct ip6_hdr *);
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ip6->ip6_flow = 0;
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ip6->ip6_vfc = IPV6_VERSION;
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ip6->ip6_plen = htons((u_short)m->m_pkthdr.len);
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ip6->ip6_nxt = proto;
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ip6->ip6_hlim = ip6_gif_hlim;
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ip6->ip6_src = sin6_src->sin6_addr;
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if (ifp->if_flags & IFF_LINK0) {
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/* multi-destination mode */
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if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr))
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ip6->ip6_dst = sin6_dst->sin6_addr;
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else if (rt) {
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ip6->ip6_dst = ((struct sockaddr_in6 *)(rt->rt_gateway))->sin6_addr;
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} else {
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m_freem(m);
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return ENETUNREACH;
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}
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} else {
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/* bidirectional configured tunnel mode */
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if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr))
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ip6->ip6_dst = sin6_dst->sin6_addr;
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else {
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m_freem(m);
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return ENETUNREACH;
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}
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}
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if (dst->sin6_family != sin6_dst->sin6_family ||
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!IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) {
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/* cache route doesn't match */
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bzero(dst, sizeof(*dst));
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dst->sin6_family = sin6_dst->sin6_family;
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dst->sin6_len = sizeof(struct sockaddr_in6);
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dst->sin6_addr = sin6_dst->sin6_addr;
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if (sc->gif_ro6.ro_rt) {
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RTFREE(sc->gif_ro6.ro_rt);
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sc->gif_ro6.ro_rt = NULL;
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}
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}
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if (sc->gif_ro6.ro_rt == NULL) {
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rtalloc((struct route *)&sc->gif_ro6);
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if (sc->gif_ro6.ro_rt == NULL) {
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m_freem(m);
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return ENETUNREACH;
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}
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}
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#ifdef IPSEC
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m->m_pkthdr.rcvif = NULL;
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#endif /*IPSEC*/
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return(ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL));
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}
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int in6_gif_input(mp, offp, proto)
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struct mbuf **mp;
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int *offp, proto;
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{
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struct mbuf *m = *mp;
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struct gif_softc *sc;
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struct ifnet *gifp = NULL;
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struct ip6_hdr *ip6;
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int i;
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int af = 0;
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ip6 = mtod(m, struct ip6_hdr *);
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#define satoin6(sa) (((struct sockaddr_in6 *)(sa))->sin6_addr)
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for (i = 0, sc = gif; i < ngif; i++, sc++) {
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if (sc->gif_psrc == NULL ||
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sc->gif_pdst == NULL ||
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sc->gif_psrc->sa_family != AF_INET6 ||
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sc->gif_pdst->sa_family != AF_INET6) {
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continue;
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}
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if ((sc->gif_if.if_flags & IFF_UP) == 0)
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continue;
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if ((sc->gif_if.if_flags & IFF_LINK0) &&
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IN6_ARE_ADDR_EQUAL(&satoin6(sc->gif_psrc), &ip6->ip6_dst) &&
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IN6_IS_ADDR_UNSPECIFIED(&satoin6(sc->gif_pdst))) {
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gifp = &sc->gif_if;
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continue;
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}
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if (IN6_ARE_ADDR_EQUAL(&satoin6(sc->gif_psrc), &ip6->ip6_dst) &&
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IN6_ARE_ADDR_EQUAL(&satoin6(sc->gif_pdst), &ip6->ip6_src)) {
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gifp = &sc->gif_if;
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break;
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}
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}
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if (gifp == NULL) {
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m_freem(m);
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ip6stat.ip6s_nogif++;
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return IPPROTO_DONE;
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}
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m_adj(m, *offp);
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switch (proto) {
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#ifdef INET
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case IPPROTO_IPV4:
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{
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struct ip *ip;
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af = AF_INET;
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if (m->m_len < sizeof(*ip)) {
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m = m_pullup(m, sizeof(*ip));
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if (!m)
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return IPPROTO_DONE;
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}
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ip = mtod(m, struct ip *);
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break;
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}
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#endif /* INET */
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case IPPROTO_IPV6:
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{
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struct ip6_hdr *ip6;
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af = AF_INET6;
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if (m->m_len < sizeof(*ip6)) {
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m = m_pullup(m, sizeof(*ip6));
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if (!m)
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return IPPROTO_DONE;
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}
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ip6 = mtod(m, struct ip6_hdr *);
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break;
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}
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default:
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ip6stat.ip6s_nogif++;
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m_freem(m);
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return IPPROTO_DONE;
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}
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gif_input(m, af, gifp);
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return IPPROTO_DONE;
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}
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