1 /* $FreeBSD: src/sys/netinet/in_gif.c,v 1.5.2.11 2003/01/23 21:06:45 sam Exp $ */
2 /* $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 itojun Exp $ */
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include "opt_inet6.h"
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/socket.h>
39 #include <sys/sockio.h>
41 #include <sys/errno.h>
42 #include <sys/kernel.h>
43 #include <sys/sysctl.h>
44 #include <sys/protosw.h>
46 #include <sys/malloc.h>
49 #include <net/route.h>
51 #include <netinet/in.h>
52 #include <netinet/in_systm.h>
53 #include <netinet/ip.h>
54 #include <netinet/ip_var.h>
55 #include <netinet/in_gif.h>
56 #include <netinet/in_var.h>
57 #include <netinet/ip_encap.h>
58 #include <netinet/ip_ecn.h>
61 #include <netinet/ip6.h>
64 #include <net/if_gif.h>
66 #include <net/net_osdep.h>
68 static int gif_validate4 __P((const struct ip *, struct gif_softc *,
71 extern struct domain inetdomain;
72 struct protosw in_gif_protosw =
73 { SOCK_RAW, &inetdomain, 0/*IPPROTO_IPV[46]*/, PR_ATOMIC|PR_ADDR,
74 in_gif_input, rip_output, 0, rip_ctloutput,
80 int ip_gif_ttl = GIF_TTL;
81 SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
85 in_gif_output(ifp, family, m)
90 struct gif_softc *sc = (struct gif_softc*)ifp;
91 struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst;
92 struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
93 struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
94 struct ip iphdr; /* capsule IP header, host byte ordered */
98 if (sin_src == NULL || sin_dst == NULL ||
99 sin_src->sin_family != AF_INET ||
100 sin_dst->sin_family != AF_INET) {
111 proto = IPPROTO_IPV4;
112 if (m->m_len < sizeof(*ip)) {
113 m = m_pullup(m, sizeof(*ip));
117 ip = mtod(m, struct ip *);
126 proto = IPPROTO_IPV6;
127 if (m->m_len < sizeof(*ip6)) {
128 m = m_pullup(m, sizeof(*ip6));
132 ip6 = mtod(m, struct ip6_hdr *);
133 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
139 printf("in_gif_output: warning: unknown family %d passed\n",
146 bzero(&iphdr, sizeof(iphdr));
147 iphdr.ip_src = sin_src->sin_addr;
148 /* bidirectional configured tunnel mode */
149 if (sin_dst->sin_addr.s_addr != INADDR_ANY)
150 iphdr.ip_dst = sin_dst->sin_addr;
156 /* version will be set in ip_output() */
157 iphdr.ip_ttl = ip_gif_ttl;
158 iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
159 if (ifp->if_flags & IFF_LINK1)
160 ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos);
162 ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos);
164 /* prepend new IP header */
165 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
166 if (m && m->m_len < sizeof(struct ip))
167 m = m_pullup(m, sizeof(struct ip));
169 printf("ENOBUFS in in_gif_output %d\n", __LINE__);
172 bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
174 if (dst->sin_family != sin_dst->sin_family ||
175 dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
176 /* cache route doesn't match */
177 dst->sin_family = sin_dst->sin_family;
178 dst->sin_len = sizeof(struct sockaddr_in);
179 dst->sin_addr = sin_dst->sin_addr;
180 if (sc->gif_ro.ro_rt) {
181 RTFREE(sc->gif_ro.ro_rt);
182 sc->gif_ro.ro_rt = NULL;
185 sc->gif_if.if_mtu = GIF_MTU;
189 if (sc->gif_ro.ro_rt == NULL) {
190 rtalloc(&sc->gif_ro);
191 if (sc->gif_ro.ro_rt == NULL) {
196 /* if it constitutes infinite encapsulation, punt. */
197 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
199 return ENETUNREACH; /* XXX */
202 ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu
207 error = ip_output(m, NULL, &sc->gif_ro, 0, NULL, NULL);
212 in_gif_input(m, off, proto)
217 struct ifnet *gifp = NULL;
222 ip = mtod(m, struct ip *);
224 gifp = (struct ifnet *)encap_getarg(m);
226 if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
241 if (m->m_len < sizeof(*ip)) {
242 m = m_pullup(m, sizeof(*ip));
246 ip = mtod(m, struct ip *);
247 if (gifp->if_flags & IFF_LINK1)
248 ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos);
250 ip_ecn_egress(ECN_NOCARE, &otos, &ip->ip_tos);
260 if (m->m_len < sizeof(*ip6)) {
261 m = m_pullup(m, sizeof(*ip6));
265 ip6 = mtod(m, struct ip6_hdr *);
266 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
267 if (gifp->if_flags & IFF_LINK1)
268 ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
270 ip_ecn_egress(ECN_NOCARE, &otos, &itos);
271 ip6->ip6_flow &= ~htonl(0xff << 20);
272 ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
281 gif_input(m, af, gifp);
286 * validate outer address.
289 gif_validate4(ip, sc, ifp)
291 struct gif_softc *sc;
294 struct sockaddr_in *src, *dst;
295 struct in_ifaddr *ia4;
297 src = (struct sockaddr_in *)sc->gif_psrc;
298 dst = (struct sockaddr_in *)sc->gif_pdst;
300 /* check for address match */
301 if (src->sin_addr.s_addr != ip->ip_dst.s_addr ||
302 dst->sin_addr.s_addr != ip->ip_src.s_addr)
305 /* martian filters on outer source - NOT done in ip_input! */
306 if (IN_MULTICAST(ntohl(ip->ip_src.s_addr)))
308 switch ((ntohl(ip->ip_src.s_addr) & 0xff000000) >> 24) {
309 case 0: case 127: case 255:
312 /* reject packets with broadcast on source */
313 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); ia4;
314 ia4 = TAILQ_NEXT(ia4, ia_link))
316 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
318 if (ip->ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr)
322 /* ingress filters on outer source */
323 if ((sc->gif_if.if_flags & IFF_LINK2) == 0 && ifp) {
324 struct sockaddr_in sin;
327 bzero(&sin, sizeof(sin));
328 sin.sin_family = AF_INET;
329 sin.sin_len = sizeof(struct sockaddr_in);
330 sin.sin_addr = ip->ip_src;
331 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL);
332 if (!rt || rt->rt_ifp != ifp) {
334 log(LOG_WARNING, "%s: packet from 0x%x dropped "
335 "due to ingress filter\n", if_name(&sc->gif_if),
336 (u_int32_t)ntohl(sin.sin_addr.s_addr));
349 * we know that we are in IFF_UP, outer address available, and outer family
350 * matched the physical addr family. see gif_encapcheck().
353 gif_encapcheck4(m, off, proto, arg)
354 const struct mbuf *m;
360 struct gif_softc *sc;
363 /* sanity check done in caller */
364 sc = (struct gif_softc *)arg;
366 /* LINTED const cast */
367 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip);
368 ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
370 return gif_validate4(&ip, sc, ifp);
375 struct gif_softc *sc;
377 sc->encap_cookie4 = encap_attach_func(AF_INET, -1, gif_encapcheck,
378 &in_gif_protosw, sc);
379 if (sc->encap_cookie4 == NULL)
386 struct gif_softc *sc;
390 error = encap_detach(sc->encap_cookie4);
392 sc->encap_cookie4 = NULL;