1 /* $FreeBSD: src/sys/netinet/in_gif.c,v 1.5.2.11 2003/01/23 21:06:45 sam Exp $ */
2 /* $DragonFly: src/sys/netinet/in_gif.c,v 1.3 2003/06/23 17:55:46 dillon Exp $ */
3 /* $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 itojun Exp $ */
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 #include "opt_inet6.h"
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/socket.h>
40 #include <sys/sockio.h>
42 #include <sys/errno.h>
43 #include <sys/kernel.h>
44 #include <sys/sysctl.h>
45 #include <sys/protosw.h>
47 #include <sys/malloc.h>
50 #include <net/route.h>
52 #include <netinet/in.h>
53 #include <netinet/in_systm.h>
54 #include <netinet/ip.h>
55 #include <netinet/ip_var.h>
56 #include <netinet/in_gif.h>
57 #include <netinet/in_var.h>
58 #include <netinet/ip_encap.h>
59 #include <netinet/ip_ecn.h>
62 #include <netinet/ip6.h>
65 #include <net/if_gif.h>
67 #include <net/net_osdep.h>
69 static int gif_validate4 __P((const struct ip *, struct gif_softc *,
72 extern struct domain inetdomain;
73 struct protosw in_gif_protosw =
74 { SOCK_RAW, &inetdomain, 0/*IPPROTO_IPV[46]*/, PR_ATOMIC|PR_ADDR,
75 in_gif_input, rip_output, 0, rip_ctloutput,
81 int ip_gif_ttl = GIF_TTL;
82 SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
86 in_gif_output(ifp, family, m)
91 struct gif_softc *sc = (struct gif_softc*)ifp;
92 struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst;
93 struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
94 struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
95 struct ip iphdr; /* capsule IP header, host byte ordered */
99 if (sin_src == NULL || sin_dst == NULL ||
100 sin_src->sin_family != AF_INET ||
101 sin_dst->sin_family != AF_INET) {
112 proto = IPPROTO_IPV4;
113 if (m->m_len < sizeof(*ip)) {
114 m = m_pullup(m, sizeof(*ip));
118 ip = mtod(m, struct ip *);
127 proto = IPPROTO_IPV6;
128 if (m->m_len < sizeof(*ip6)) {
129 m = m_pullup(m, sizeof(*ip6));
133 ip6 = mtod(m, struct ip6_hdr *);
134 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
140 printf("in_gif_output: warning: unknown family %d passed\n",
147 bzero(&iphdr, sizeof(iphdr));
148 iphdr.ip_src = sin_src->sin_addr;
149 /* bidirectional configured tunnel mode */
150 if (sin_dst->sin_addr.s_addr != INADDR_ANY)
151 iphdr.ip_dst = sin_dst->sin_addr;
157 /* version will be set in ip_output() */
158 iphdr.ip_ttl = ip_gif_ttl;
159 iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
160 if (ifp->if_flags & IFF_LINK1)
161 ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos);
163 ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos);
165 /* prepend new IP header */
166 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
167 if (m && m->m_len < sizeof(struct ip))
168 m = m_pullup(m, sizeof(struct ip));
170 printf("ENOBUFS in in_gif_output %d\n", __LINE__);
173 bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
175 if (dst->sin_family != sin_dst->sin_family ||
176 dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
177 /* cache route doesn't match */
178 dst->sin_family = sin_dst->sin_family;
179 dst->sin_len = sizeof(struct sockaddr_in);
180 dst->sin_addr = sin_dst->sin_addr;
181 if (sc->gif_ro.ro_rt) {
182 RTFREE(sc->gif_ro.ro_rt);
183 sc->gif_ro.ro_rt = NULL;
186 sc->gif_if.if_mtu = GIF_MTU;
190 if (sc->gif_ro.ro_rt == NULL) {
191 rtalloc(&sc->gif_ro);
192 if (sc->gif_ro.ro_rt == NULL) {
197 /* if it constitutes infinite encapsulation, punt. */
198 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
200 return ENETUNREACH; /* XXX */
203 ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu
208 error = ip_output(m, NULL, &sc->gif_ro, 0, NULL, NULL);
213 in_gif_input(m, off, proto)
218 struct ifnet *gifp = NULL;
223 ip = mtod(m, struct ip *);
225 gifp = (struct ifnet *)encap_getarg(m);
227 if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
242 if (m->m_len < sizeof(*ip)) {
243 m = m_pullup(m, sizeof(*ip));
247 ip = mtod(m, struct ip *);
248 if (gifp->if_flags & IFF_LINK1)
249 ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos);
251 ip_ecn_egress(ECN_NOCARE, &otos, &ip->ip_tos);
261 if (m->m_len < sizeof(*ip6)) {
262 m = m_pullup(m, sizeof(*ip6));
266 ip6 = mtod(m, struct ip6_hdr *);
267 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
268 if (gifp->if_flags & IFF_LINK1)
269 ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
271 ip_ecn_egress(ECN_NOCARE, &otos, &itos);
272 ip6->ip6_flow &= ~htonl(0xff << 20);
273 ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
282 gif_input(m, af, gifp);
287 * validate outer address.
290 gif_validate4(ip, sc, ifp)
292 struct gif_softc *sc;
295 struct sockaddr_in *src, *dst;
296 struct in_ifaddr *ia4;
298 src = (struct sockaddr_in *)sc->gif_psrc;
299 dst = (struct sockaddr_in *)sc->gif_pdst;
301 /* check for address match */
302 if (src->sin_addr.s_addr != ip->ip_dst.s_addr ||
303 dst->sin_addr.s_addr != ip->ip_src.s_addr)
306 /* martian filters on outer source - NOT done in ip_input! */
307 if (IN_MULTICAST(ntohl(ip->ip_src.s_addr)))
309 switch ((ntohl(ip->ip_src.s_addr) & 0xff000000) >> 24) {
310 case 0: case 127: case 255:
313 /* reject packets with broadcast on source */
314 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); ia4;
315 ia4 = TAILQ_NEXT(ia4, ia_link))
317 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
319 if (ip->ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr)
323 /* ingress filters on outer source */
324 if ((sc->gif_if.if_flags & IFF_LINK2) == 0 && ifp) {
325 struct sockaddr_in sin;
328 bzero(&sin, sizeof(sin));
329 sin.sin_family = AF_INET;
330 sin.sin_len = sizeof(struct sockaddr_in);
331 sin.sin_addr = ip->ip_src;
332 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL);
333 if (!rt || rt->rt_ifp != ifp) {
335 log(LOG_WARNING, "%s: packet from 0x%x dropped "
336 "due to ingress filter\n", if_name(&sc->gif_if),
337 (u_int32_t)ntohl(sin.sin_addr.s_addr));
350 * we know that we are in IFF_UP, outer address available, and outer family
351 * matched the physical addr family. see gif_encapcheck().
354 gif_encapcheck4(m, off, proto, arg)
355 const struct mbuf *m;
361 struct gif_softc *sc;
364 /* sanity check done in caller */
365 sc = (struct gif_softc *)arg;
367 /* LINTED const cast */
368 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip);
369 ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
371 return gif_validate4(&ip, sc, ifp);
376 struct gif_softc *sc;
378 sc->encap_cookie4 = encap_attach_func(AF_INET, -1, gif_encapcheck,
379 &in_gif_protosw, sc);
380 if (sc->encap_cookie4 == NULL)
387 struct gif_softc *sc;
391 error = encap_detach(sc->encap_cookie4);
393 sc->encap_cookie4 = NULL;