362 lines
8.5 KiB
C
362 lines
8.5 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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* in_gif.c
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*/
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#include "opt_mrouting.h"
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#include "opt_inet6.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/kernel.h>
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#include <sys/sysctl.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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#include <netinet/ip.h>
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#ifdef INET6
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#include <netinet/ip6.h>
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#endif
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#include <netinet/ip_var.h>
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#include <netinet/in_gif.h>
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#include <netinet/ip_ecn.h>
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#ifdef INET6
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#include <netinet6/ip6_ecn.h>
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#endif
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#ifdef MROUTING
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#include <netinet/ip_mroute.h>
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#endif /* MROUTING */
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#include <net/if_gif.h>
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#include "gif.h"
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#include <machine/stdarg.h>
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#include <net/net_osdep.h>
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#if NGIF > 0
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int ip_gif_ttl = GIF_TTL;
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#else
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int ip_gif_ttl = 0;
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#endif
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SYSCTL_DECL(_net_inet_ip);
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SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
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&ip_gif_ttl, 0, "");
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#define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002)
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#define GET_V4(x) ((struct in_addr *)(&(x)->s6_addr16[1]))
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int
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in_gif_output(ifp, family, m, rt)
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struct ifnet *ifp;
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int family;
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struct mbuf *m;
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struct rtentry *rt;
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{
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register struct gif_softc *sc = (struct gif_softc*)ifp;
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struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst;
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struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
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struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
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struct ip iphdr; /* capsule IP header, host byte ordered */
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int proto, error;
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u_int8_t tos;
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#ifdef INET6
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struct ip6_hdr *ip6 = NULL;
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#endif
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if (sin_src == NULL || sin_dst == NULL ||
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sin_src->sin_family != AF_INET ||
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sin_dst->sin_family != AF_INET) {
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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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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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tos = ip->ip_tos;
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break;
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}
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#ifdef INET6
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case AF_INET6:
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{
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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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tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
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break;
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}
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#endif /*INET6*/
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default:
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#ifdef DIAGNOSTIC
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printf("in_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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bzero(&iphdr, sizeof(iphdr));
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iphdr.ip_src = sin_src->sin_addr;
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#ifdef INET6
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/* XXX: temporal stf support hack */
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if (bcmp(ifp->if_name, "stf", 3) == 0) {
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if (ip6 == NULL) {
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m_freem(m);
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return ENETUNREACH;
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}
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if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst))
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iphdr.ip_dst = *GET_V4(&ip6->ip6_dst);
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else if (rt && rt->rt_gateway->sa_family == AF_INET6) {
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struct in6_addr *dst6;
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dst6 = &((struct sockaddr_in6 *)
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(rt->rt_gateway))->sin6_addr;
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if (IN6_IS_ADDR_6TO4(dst6))
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iphdr.ip_dst = *GET_V4(dst6);
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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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m_freem(m);
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return ENETUNREACH;
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}
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} else
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#endif
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if (ifp->if_flags & IFF_LINK0) {
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/* multi-destination mode */
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if (sin_dst->sin_addr.s_addr != INADDR_ANY)
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iphdr.ip_dst = sin_dst->sin_addr;
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else if (rt) {
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iphdr.ip_dst = ((struct sockaddr_in *)
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(rt->rt_gateway))->sin_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 (sin_dst->sin_addr.s_addr != INADDR_ANY)
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iphdr.ip_dst = sin_dst->sin_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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iphdr.ip_p = proto;
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/* version will be set in ip_output() */
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iphdr.ip_ttl = ip_gif_ttl;
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iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
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if (ifp->if_flags & IFF_LINK1)
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ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos);
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/* prepend new IP header */
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M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
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if (m && m->m_len < sizeof(struct ip))
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m = m_pullup(m, sizeof(struct ip));
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if (m == NULL) {
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printf("ENOBUFS in in_gif_output %d\n", __LINE__);
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return ENOBUFS;
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}
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*(mtod(m, struct ip *)) = iphdr;
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if (dst->sin_family != sin_dst->sin_family ||
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dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
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/* cache route doesn't match */
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dst->sin_family = sin_dst->sin_family;
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dst->sin_len = sizeof(struct sockaddr_in);
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dst->sin_addr = sin_dst->sin_addr;
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if (sc->gif_ro.ro_rt) {
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RTFREE(sc->gif_ro.ro_rt);
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sc->gif_ro.ro_rt = NULL;
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}
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}
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if (sc->gif_ro.ro_rt == NULL) {
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rtalloc(&sc->gif_ro);
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if (sc->gif_ro.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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error = ip_output(m, 0, &sc->gif_ro, 0, 0);
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return(error);
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}
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void
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in_gif_input(struct mbuf *m, int off, int proto)
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{
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struct gif_softc *sc;
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struct ifnet *gifp = NULL;
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struct ip *ip;
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int i, af;
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u_int8_t otos;
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ip = mtod(m, struct ip *);
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/* this code will be soon improved. */
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#define satosin(sa) ((struct sockaddr_in *)(sa))
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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_INET
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|| sc->gif_pdst->sa_family != AF_INET) {
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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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#ifdef INET6
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/* XXX: temporal stf support hack */
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if (proto == IPPROTO_IPV6 &&
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bcmp(sc->gif_if.if_name, "stf", 3) == 0 &&
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(satosin(sc->gif_psrc)->sin_addr.s_addr ==
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ip->ip_dst.s_addr ||
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IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) &&
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satosin(sc->gif_pdst)->sin_addr.s_addr ==
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INADDR_BROADCAST) {
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gifp = &sc->gif_if;
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break;
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}
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#endif
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if ((sc->gif_if.if_flags & IFF_LINK0)
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&& satosin(sc->gif_psrc)->sin_addr.s_addr == ip->ip_dst.s_addr
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&& satosin(sc->gif_pdst)->sin_addr.s_addr == INADDR_ANY) {
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gifp = &sc->gif_if;
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continue;
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}
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if (satosin(sc->gif_psrc)->sin_addr.s_addr == ip->ip_dst.s_addr
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&& satosin(sc->gif_pdst)->sin_addr.s_addr == ip->ip_src.s_addr)
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{
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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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#ifdef MROUTING
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/* for backward compatibility */
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if (proto == IPPROTO_IPV4) {
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ipip_input(m, off, proto);
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return;
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}
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#endif /*MROUTING*/
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m_freem(m);
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ipstat.ips_nogif++;
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return;
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}
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otos = ip->ip_tos;
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m_adj(m, off);
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switch (proto) {
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case IPPROTO_IPV4:
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{
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struct ip *ip;
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#ifdef INET6
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if (bcmp(gifp->if_name, "stf", 3) == 0) {
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m_freem(m);
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return;
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}
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#endif
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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;
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}
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ip = mtod(m, struct ip *);
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if (gifp->if_flags & IFF_LINK1)
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ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos);
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break;
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}
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#ifdef INET6
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case IPPROTO_IPV6:
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{
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struct ip6_hdr *ip6;
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u_int8_t itos;
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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;
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}
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ip6 = mtod(m, struct ip6_hdr *);
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itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
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if (gifp->if_flags & IFF_LINK1)
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ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
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ip6->ip6_flow &= ~htonl(0xff << 20);
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ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
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break;
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}
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#endif /* INET6 */
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default:
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ipstat.ips_nogif++;
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m_freem(m);
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return;
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}
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gif_input(m, af, gifp);
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return;
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}
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