2 /* $KAME: in6_gif.c,v 1.49 2001/05/14 14:02:17 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/queue.h>
43 #include <sys/syslog.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>
54 #include <netinet/ip.h>
56 #include <netinet/ip_encap.h>
58 #include <netinet/ip6.h>
59 #include <netinet6/ip6_var.h>
60 #include <netinet6/in6_gif.h>
61 #include <netinet6/in6_var.h>
63 #include <netinet6/ip6protosw.h>
64 #include <netinet/ip_ecn.h>
66 #include <netinet6/ip6_ecn.h>
69 #include <net/if_gif.h>
71 #include <net/net_osdep.h>
73 static int gif_validate6(const struct ip6_hdr *, struct gif_softc *,
76 extern struct domain inet6domain;
77 struct ip6protosw in6_gif_protosw =
78 { SOCK_RAW, &inet6domain, 0/* IPPROTO_IPV[46] */, PR_ATOMIC|PR_ADDR,
79 in6_gif_input, rip6_output, 0, rip6_ctloutput,
86 in6_gif_output(ifp, family, m)
88 int family; /* family of the packet to be encapsulate. */
91 struct gif_softc *sc = ifp->if_softc;
92 struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst;
93 struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc;
94 struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst;
99 if (sin6_src == NULL || sin6_dst == NULL ||
100 sin6_src->sin6_family != AF_INET6 ||
101 sin6_dst->sin6_family != AF_INET6) {
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 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
140 printf("in6_gif_output: warning: unknown family %d passed\n",
147 /* prepend new IP header */
148 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT);
149 if (m && m->m_len < sizeof(struct ip6_hdr))
150 m = m_pullup(m, sizeof(struct ip6_hdr));
152 printf("ENOBUFS in in6_gif_output %d\n", __LINE__);
156 ip6 = mtod(m, struct ip6_hdr *);
158 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
159 ip6->ip6_vfc |= IPV6_VERSION;
160 ip6->ip6_plen = htons((u_short)m->m_pkthdr.len);
161 ip6->ip6_nxt = proto;
162 ip6->ip6_hlim = ip6_gif_hlim;
163 ip6->ip6_src = sin6_src->sin6_addr;
164 /* bidirectional configured tunnel mode */
165 if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr))
166 ip6->ip6_dst = sin6_dst->sin6_addr;
171 ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE,
173 ip6->ip6_flow &= ~htonl(0xff << 20);
174 ip6->ip6_flow |= htonl((u_int32_t)otos << 20);
176 if (dst->sin6_family != sin6_dst->sin6_family ||
177 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) {
178 /* cache route doesn't match */
179 bzero(dst, sizeof(*dst));
180 dst->sin6_family = sin6_dst->sin6_family;
181 dst->sin6_len = sizeof(struct sockaddr_in6);
182 dst->sin6_addr = sin6_dst->sin6_addr;
183 if (sc->gif_ro6.ro_rt) {
184 RTFREE(sc->gif_ro6.ro_rt);
185 sc->gif_ro6.ro_rt = NULL;
188 GIF2IFP(sc)->if_mtu = GIF_MTU;
192 if (sc->gif_ro6.ro_rt == NULL) {
193 rtalloc((struct route *)&sc->gif_ro6);
194 if (sc->gif_ro6.ro_rt == NULL) {
199 /* if it constitutes infinite encapsulation, punt. */
200 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
202 return ENETUNREACH; /*XXX*/
205 ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu
206 - sizeof(struct ip6_hdr);
212 * force fragmentation to minimum MTU, to avoid path MTU discovery.
213 * it is too painful to ask for resend of inner packet, to achieve
214 * path MTU discovery for encapsulated packets.
216 error = ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL);
218 error = ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL);
221 if (!(GIF2IFP(sc)->if_flags & IFF_LINK0) &&
222 sc->gif_ro6.ro_rt != NULL) {
223 RTFREE(sc->gif_ro6.ro_rt);
224 sc->gif_ro6.ro_rt = NULL;
231 in6_gif_input(mp, offp, proto)
235 struct mbuf *m = *mp;
236 struct ifnet *gifp = NULL;
237 struct gif_softc *sc;
242 ip6 = mtod(m, struct ip6_hdr *);
244 sc = (struct gif_softc *)encap_getarg(m);
247 ip6stat.ip6s_nogif++;
252 if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
254 ip6stat.ip6s_nogif++;
258 otos = ip6->ip6_flow;
268 otos8 = (ntohl(otos) >> 20) & 0xff;
269 if (m->m_len < sizeof(*ip)) {
270 m = m_pullup(m, sizeof(*ip));
274 ip = mtod(m, struct ip *);
275 if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ?
276 ECN_ALLOWED : ECN_NOCARE,
277 &otos8, &ip->ip_tos) == 0) {
289 if (m->m_len < sizeof(*ip6)) {
290 m = m_pullup(m, sizeof(*ip6));
294 ip6 = mtod(m, struct ip6_hdr *);
295 if (ip6_ecn_egress((gifp->if_flags & IFF_LINK1) ?
296 ECN_ALLOWED : ECN_NOCARE,
297 &otos, &ip6->ip6_flow) == 0) {
305 ip6stat.ip6s_nogif++;
310 gif_input(m, af, gifp);
315 * validate outer address.
318 gif_validate6(ip6, sc, ifp)
319 const struct ip6_hdr *ip6;
320 struct gif_softc *sc;
323 struct sockaddr_in6 *src, *dst;
325 src = (struct sockaddr_in6 *)sc->gif_psrc;
326 dst = (struct sockaddr_in6 *)sc->gif_pdst;
329 * Check for address match. Note that the check is for an incoming
330 * packet. We should compare the *source* address in our configuration
331 * and the *destination* address of the packet, and vice versa.
333 if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) ||
334 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src))
337 /* martian filters on outer source - done in ip6_input */
339 /* ingress filters on outer source */
340 if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) {
341 struct sockaddr_in6 sin6;
344 bzero(&sin6, sizeof(sin6));
345 sin6.sin6_family = AF_INET6;
346 sin6.sin6_len = sizeof(struct sockaddr_in6);
347 sin6.sin6_addr = ip6->ip6_src;
348 sin6.sin6_scope_id = 0; /* XXX */
350 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
351 if (!rt || rt->rt_ifp != ifp) {
353 log(LOG_WARNING, "%s: packet from %s dropped "
354 "due to ingress filter\n", if_name(GIF2IFP(sc)),
355 ip6_sprintf(&sin6.sin6_addr));
368 * we know that we are in IFF_UP, outer address available, and outer family
369 * matched the physical addr family. see gif_encapcheck().
370 * sanity check for arg should have been done in the caller.
373 gif_encapcheck6(m, off, proto, arg)
374 const struct mbuf *m;
380 struct gif_softc *sc;
383 /* sanity check done in caller */
384 sc = (struct gif_softc *)arg;
386 /* LINTED const cast */
387 m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6);
388 ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
390 return gif_validate6(&ip6, sc, ifp);
395 struct gif_softc *sc;
397 sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck,
398 (struct protosw *)&in6_gif_protosw, sc);
399 if (sc->encap_cookie6 == NULL)
406 struct gif_softc *sc;
410 error = encap_detach(sc->encap_cookie6);
412 sc->encap_cookie6 = NULL;