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
33 #include "opt_mrouting.h"
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>
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>
65 #include <netinet/ip_mroute.h>
68 #include <net/if_gif.h>
70 #include <net/net_osdep.h>
72 static int ip_gif_ttl = GIF_TTL;
73 SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
77 in_gif_output(ifp, family, m, rt)
83 struct gif_softc *sc = (struct gif_softc*)ifp;
84 struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst;
85 struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
86 struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
87 struct ip iphdr; /* capsule IP header, host byte ordered */
91 if (sin_src == NULL || sin_dst == NULL ||
92 sin_src->sin_family != AF_INET ||
93 sin_dst->sin_family != AF_INET) {
104 proto = IPPROTO_IPV4;
105 if (m->m_len < sizeof(*ip)) {
106 m = m_pullup(m, sizeof(*ip));
110 ip = mtod(m, struct ip *);
119 proto = IPPROTO_IPV6;
120 if (m->m_len < sizeof(*ip6)) {
121 m = m_pullup(m, sizeof(*ip6));
125 ip6 = mtod(m, struct ip6_hdr *);
126 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
132 printf("in_gif_output: warning: unknown family %d passed\n",
139 bzero(&iphdr, sizeof(iphdr));
140 iphdr.ip_src = sin_src->sin_addr;
141 /* bidirectional configured tunnel mode */
142 if (sin_dst->sin_addr.s_addr != INADDR_ANY)
143 iphdr.ip_dst = sin_dst->sin_addr;
149 /* version will be set in ip_output() */
150 iphdr.ip_ttl = ip_gif_ttl;
151 iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
152 if (ifp->if_flags & IFF_LINK1)
153 ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos);
155 ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos);
157 /* prepend new IP header */
158 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
159 if (m && m->m_len < sizeof(struct ip))
160 m = m_pullup(m, sizeof(struct ip));
162 printf("ENOBUFS in in_gif_output %d\n", __LINE__);
165 bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
167 if (dst->sin_family != sin_dst->sin_family ||
168 dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
169 /* cache route doesn't match */
170 dst->sin_family = sin_dst->sin_family;
171 dst->sin_len = sizeof(struct sockaddr_in);
172 dst->sin_addr = sin_dst->sin_addr;
173 if (sc->gif_ro.ro_rt) {
174 RTFREE(sc->gif_ro.ro_rt);
175 sc->gif_ro.ro_rt = NULL;
178 sc->gif_if.if_mtu = GIF_MTU;
182 if (sc->gif_ro.ro_rt == NULL) {
183 rtalloc(&sc->gif_ro);
184 if (sc->gif_ro.ro_rt == NULL) {
189 /* if it constitutes infinite encapsulation, punt. */
190 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
192 return ENETUNREACH; /*XXX*/
195 ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu
200 error = ip_output(m, NULL, &sc->gif_ro, 0, NULL);
209 struct ifnet *gifp = NULL;
215 ip = mtod(m, struct ip *);
218 gifp = (struct ifnet *)encap_getarg(m);
220 if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
235 if (m->m_len < sizeof(*ip)) {
236 m = m_pullup(m, sizeof(*ip));
240 ip = mtod(m, struct ip *);
241 if (gifp->if_flags & IFF_LINK1)
242 ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos);
244 ip_ecn_egress(ECN_NOCARE, &otos, &ip->ip_tos);
254 if (m->m_len < sizeof(*ip6)) {
255 m = m_pullup(m, sizeof(*ip6));
259 ip6 = mtod(m, struct ip6_hdr *);
260 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
261 if (gifp->if_flags & IFF_LINK1)
262 ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
264 ip_ecn_egress(ECN_NOCARE, &otos, &itos);
265 ip6->ip6_flow &= ~htonl(0xff << 20);
266 ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
275 gif_input(m, af, gifp);
280 * we know that we are in IFF_UP, outer address available, and outer family
281 * matched the physical addr family. see gif_encapcheck().
284 gif_encapcheck4(m, off, proto, arg)
285 const struct mbuf *m;
291 struct gif_softc *sc;
292 struct sockaddr_in *src, *dst;
294 struct in_ifaddr *ia4;
296 /* sanity check done in caller */
297 sc = (struct gif_softc *)arg;
298 src = (struct sockaddr_in *)sc->gif_psrc;
299 dst = (struct sockaddr_in *)sc->gif_pdst;
301 /* LINTED const cast */
302 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip);
304 /* check for address match */
306 if (src->sin_addr.s_addr == ip.ip_dst.s_addr)
308 if (dst->sin_addr.s_addr == ip.ip_src.s_addr)
313 /* martian filters on outer source - NOT done in ip_input! */
314 if (IN_MULTICAST(ntohl(ip.ip_src.s_addr)))
316 switch ((ntohl(ip.ip_src.s_addr) & 0xff000000) >> 24) {
317 case 0: case 127: case 255:
320 /* reject packets with broadcast on source */
321 TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_link)
323 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
325 if (ip.ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr)
329 /* ingress filters on outer source */
330 if ((sc->gif_if.if_flags & IFF_LINK2) == 0 &&
331 (m->m_flags & M_PKTHDR) != 0 && m->m_pkthdr.rcvif) {
332 struct sockaddr_in sin;
335 bzero(&sin, sizeof(sin));
336 sin.sin_family = AF_INET;
337 sin.sin_len = sizeof(struct sockaddr_in);
338 sin.sin_addr = ip.ip_src;
339 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL);
340 if (!rt || rt->rt_ifp != m->m_pkthdr.rcvif) {
342 log(LOG_WARNING, "%s: packet from 0x%x dropped "
343 "due to ingress filter\n", if_name(&sc->gif_if),
344 (u_int32_t)ntohl(sin.sin_addr.s_addr));