1 /* $FreeBSD: src/sys/netinet6/in6_gif.c,v 1.2.2.7 2003/01/23 21:06:47 sam Exp $ */
2 /* $DragonFly: src/sys/netinet6/in6_gif.c,v 1.18 2008/10/27 02:56:30 sephe Exp $ */
3 /* $KAME: in6_gif.c,v 1.49 2001/05/14 14:02:17 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/queue.h>
44 #include <sys/syslog.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>
55 #include <netinet/ip.h>
57 #include <netinet/ip_encap.h>
59 #include <netinet/ip6.h>
60 #include <netinet6/ip6_var.h>
61 #include <netinet6/in6_gif.h>
62 #include <netinet6/in6_var.h>
64 #include <netinet6/ip6protosw.h>
65 #include <netinet/ip_ecn.h>
67 #include <netinet6/ip6_ecn.h>
70 #include <net/gif/if_gif.h>
72 #include <net/net_osdep.h>
75 static int gif_validate6(const struct ip6_hdr *, struct gif_softc *,
78 extern struct domain inet6domain;
79 struct protosw in6_gif_protosw =
82 .pr_domain = &inet6domain,
83 .pr_protocol = 0/*IPPROTO_IPV[46]*/,
84 .pr_flags = PR_ATOMIC|PR_ADDR,
86 .pr_input = in6_gif_input,
87 .pr_output = rip6_output,
89 .pr_ctloutput = rip6_ctloutput,
91 .pr_usrreqs = &rip6_usrreqs
95 * family = family of the packet to be encapsulate.
98 in6_gif_output(struct ifnet *ifp, int family, struct mbuf *m)
100 struct gif_softc *sc = (struct gif_softc*)ifp;
101 struct route_in6 *ro = &sc->gif_ro6[mycpu->gd_cpuid];
102 struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&ro->ro_dst;
103 struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc;
104 struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst;
109 if (sin6_src == NULL || sin6_dst == NULL ||
110 sin6_src->sin6_family != AF_INET6 ||
111 sin6_dst->sin6_family != AF_INET6) {
122 proto = IPPROTO_IPV4;
123 if (m->m_len < sizeof(*ip)) {
124 m = m_pullup(m, sizeof(*ip));
128 ip = mtod(m, struct ip *);
137 proto = IPPROTO_IPV6;
138 if (m->m_len < sizeof(*ip6)) {
139 m = m_pullup(m, sizeof(*ip6));
143 ip6 = mtod(m, struct ip6_hdr *);
144 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
150 kprintf("in6_gif_output: warning: unknown family %d passed\n",
157 /* prepend new IP header */
158 M_PREPEND(m, sizeof(struct ip6_hdr), MB_DONTWAIT);
159 if (m && m->m_len < sizeof(struct ip6_hdr))
160 m = m_pullup(m, sizeof(struct ip6_hdr));
162 kprintf("ENOBUFS in in6_gif_output %d\n", __LINE__);
166 ip6 = mtod(m, struct ip6_hdr *);
168 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
169 ip6->ip6_vfc |= IPV6_VERSION;
170 ip6->ip6_plen = htons((u_short)m->m_pkthdr.len);
171 ip6->ip6_nxt = proto;
172 ip6->ip6_hlim = ip6_gif_hlim;
173 ip6->ip6_src = sin6_src->sin6_addr;
174 /* bidirectional configured tunnel mode */
175 if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr))
176 ip6->ip6_dst = sin6_dst->sin6_addr;
181 if (ifp->if_flags & IFF_LINK1)
182 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
184 ip_ecn_ingress(ECN_NOCARE, &otos, &itos);
185 ip6->ip6_flow &= ~ntohl(0xff00000);
186 ip6->ip6_flow |= htonl((u_int32_t)otos << 20);
188 if (dst->sin6_family != sin6_dst->sin6_family ||
189 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) {
190 /* cache route doesn't match */
191 bzero(dst, sizeof(*dst));
192 dst->sin6_family = sin6_dst->sin6_family;
193 dst->sin6_len = sizeof(struct sockaddr_in6);
194 dst->sin6_addr = sin6_dst->sin6_addr;
195 if (ro->ro_rt != NULL) {
200 sc->gif_if.if_mtu = GIF_MTU;
204 if (ro->ro_rt == NULL) {
205 rtalloc((struct route *)ro);
206 if (ro->ro_rt == NULL) {
211 /* if it constitutes infinite encapsulation, punt. */
212 if (ro->ro_rt->rt_ifp == ifp) {
214 return ENETUNREACH; /*XXX*/
217 ifp->if_mtu = ro->ro_rt->rt_ifp->if_mtu -
218 sizeof(struct ip6_hdr);
224 * force fragmentation to minimum MTU, to avoid path MTU discovery.
225 * it is too painful to ask for resend of inner packet, to achieve
226 * path MTU discovery for encapsulated packets.
228 return (ip6_output(m, 0, ro, IPV6_MINMTU, 0, NULL, NULL));
230 return (ip6_output(m, 0, ro, 0, 0, NULL, NULL));
235 in6_gif_input(struct mbuf **mp, int *offp, int proto)
237 struct mbuf *m = *mp;
238 struct ifnet *gifp = NULL;
243 ip6 = mtod(m, struct ip6_hdr *);
245 gifp = (struct ifnet *)encap_getarg(m);
247 if (gifp == NULL || !(gifp->if_flags & IFF_UP)) {
249 ip6stat.ip6s_nogif++;
253 otos = ip6->ip6_flow;
263 otos8 = (ntohl(otos) >> 20) & 0xff;
264 if (m->m_len < sizeof(*ip)) {
265 m = m_pullup(m, sizeof(*ip));
269 ip = mtod(m, struct ip *);
270 if (gifp->if_flags & IFF_LINK1)
271 ip_ecn_egress(ECN_ALLOWED, &otos8, &ip->ip_tos);
273 ip_ecn_egress(ECN_NOCARE, &otos8, &ip->ip_tos);
282 if (m->m_len < sizeof(*ip6)) {
283 m = m_pullup(m, sizeof(*ip6));
287 ip6 = mtod(m, struct ip6_hdr *);
288 if (gifp->if_flags & IFF_LINK1)
289 ip6_ecn_egress(ECN_ALLOWED, &otos, &ip6->ip6_flow);
291 ip6_ecn_egress(ECN_NOCARE, &otos, &ip6->ip6_flow);
296 ip6stat.ip6s_nogif++;
301 gif_input(m, af, gifp);
306 * validate outer address.
309 gif_validate6(const struct ip6_hdr *ip6, struct gif_softc *sc,
312 struct sockaddr_in6 *src, *dst;
314 src = (struct sockaddr_in6 *)sc->gif_psrc;
315 dst = (struct sockaddr_in6 *)sc->gif_pdst;
318 * Check for address match. Note that the check is for an incoming
319 * packet. We should compare the *source* address in our configuration
320 * and the *destination* address of the packet, and vice versa.
322 if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) ||
323 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src))
326 /* martian filters on outer source - done in ip6_input */
328 /* ingress filters on outer source */
329 if (!(sc->gif_if.if_flags & IFF_LINK2) && ifp) {
330 struct sockaddr_in6 sin6;
333 bzero(&sin6, sizeof(sin6));
334 sin6.sin6_family = AF_INET6;
335 sin6.sin6_len = sizeof(struct sockaddr_in6);
336 sin6.sin6_addr = ip6->ip6_src;
337 sin6.sin6_scope_id = 0; /* XXX */
339 rt = rtpurelookup((struct sockaddr *)&sin6);
342 if (rt == NULL || rt->rt_ifp != ifp) {
344 log(LOG_WARNING, "%s: packet from %s dropped "
345 "due to ingress filter\n", if_name(&sc->gif_if),
346 ip6_sprintf(&sin6.sin6_addr));
356 * we know that we are in IFF_UP, outer address available, and outer family
357 * matched the physical addr family. see gif_encapcheck().
358 * sanity check for arg should have been done in the caller.
361 gif_encapcheck6(const struct mbuf *m, int off, int proto, void *arg)
364 struct gif_softc *sc;
367 /* sanity check done in caller */
368 sc = (struct gif_softc *)arg;
370 m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6);
371 ifp = (m->m_flags & M_PKTHDR) ? m->m_pkthdr.rcvif : NULL;
373 return gif_validate6(&ip6, sc, ifp);
377 in6_gif_attach(struct gif_softc *sc)
379 sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck,
380 (struct protosw *)&in6_gif_protosw, sc);
381 if (sc->encap_cookie6 == NULL)
387 in6_gif_detach(struct gif_softc *sc)
391 error = encap_detach(sc->encap_cookie6);
393 sc->encap_cookie6 = NULL;