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 1.9 2004/12/21 02:54:47 hsu 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>
74 static int gif_validate6(const struct ip6_hdr *, struct gif_softc *,
77 extern struct domain inet6domain;
78 struct ip6protosw in6_gif_protosw =
79 { SOCK_RAW, &inet6domain, 0/*IPPROTO_IPV[46]*/, PR_ATOMIC|PR_ADDR,
80 in6_gif_input, rip6_output, 0, rip6_ctloutput,
87 in6_gif_output(struct ifnet *ifp,
88 int family, /* family of the packet to be encapsulate. */
91 struct gif_softc *sc = (struct gif_softc*)ifp;
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), MB_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 if (ifp->if_flags & IFF_LINK1)
172 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
174 ip_ecn_ingress(ECN_NOCARE, &otos, &itos);
175 ip6->ip6_flow &= ~ntohl(0xff00000);
176 ip6->ip6_flow |= htonl((u_int32_t)otos << 20);
178 if (dst->sin6_family != sin6_dst->sin6_family ||
179 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) {
180 /* cache route doesn't match */
181 bzero(dst, sizeof(*dst));
182 dst->sin6_family = sin6_dst->sin6_family;
183 dst->sin6_len = sizeof(struct sockaddr_in6);
184 dst->sin6_addr = sin6_dst->sin6_addr;
185 if (sc->gif_ro6.ro_rt) {
186 RTFREE(sc->gif_ro6.ro_rt);
187 sc->gif_ro6.ro_rt = NULL;
190 sc->gif_if.if_mtu = GIF_MTU;
194 if (sc->gif_ro6.ro_rt == NULL) {
195 rtalloc((struct route *)&sc->gif_ro6);
196 if (sc->gif_ro6.ro_rt == NULL) {
201 /* if it constitutes infinite encapsulation, punt. */
202 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
204 return ENETUNREACH; /*XXX*/
207 ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu
208 - sizeof(struct ip6_hdr);
214 * force fragmentation to minimum MTU, to avoid path MTU discovery.
215 * it is too painful to ask for resend of inner packet, to achieve
216 * path MTU discovery for encapsulated packets.
218 return(ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL));
220 return(ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL));
224 int in6_gif_input(struct mbuf **mp, int *offp, int proto)
226 struct mbuf *m = *mp;
227 struct ifnet *gifp = NULL;
232 ip6 = mtod(m, struct ip6_hdr *);
234 gifp = (struct ifnet *)encap_getarg(m);
236 if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
238 ip6stat.ip6s_nogif++;
242 otos = ip6->ip6_flow;
252 otos8 = (ntohl(otos) >> 20) & 0xff;
253 if (m->m_len < sizeof(*ip)) {
254 m = m_pullup(m, sizeof(*ip));
258 ip = mtod(m, struct ip *);
259 if (gifp->if_flags & IFF_LINK1)
260 ip_ecn_egress(ECN_ALLOWED, &otos8, &ip->ip_tos);
262 ip_ecn_egress(ECN_NOCARE, &otos8, &ip->ip_tos);
271 if (m->m_len < sizeof(*ip6)) {
272 m = m_pullup(m, sizeof(*ip6));
276 ip6 = mtod(m, struct ip6_hdr *);
277 if (gifp->if_flags & IFF_LINK1)
278 ip6_ecn_egress(ECN_ALLOWED, &otos, &ip6->ip6_flow);
280 ip6_ecn_egress(ECN_NOCARE, &otos, &ip6->ip6_flow);
285 ip6stat.ip6s_nogif++;
290 gif_input(m, af, gifp);
295 * validate outer address.
298 gif_validate6(const struct ip6_hdr *ip6, struct gif_softc *sc,
301 struct sockaddr_in6 *src, *dst;
303 src = (struct sockaddr_in6 *)sc->gif_psrc;
304 dst = (struct sockaddr_in6 *)sc->gif_pdst;
307 * Check for address match. Note that the check is for an incoming
308 * packet. We should compare the *source* address in our configuration
309 * and the *destination* address of the packet, and vice versa.
311 if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) ||
312 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src))
315 /* martian filters on outer source - done in ip6_input */
317 /* ingress filters on outer source */
318 if ((sc->gif_if.if_flags & IFF_LINK2) == 0 && ifp) {
319 struct sockaddr_in6 sin6;
322 bzero(&sin6, sizeof(sin6));
323 sin6.sin6_family = AF_INET6;
324 sin6.sin6_len = sizeof(struct sockaddr_in6);
325 sin6.sin6_addr = ip6->ip6_src;
326 #ifndef SCOPEDROUTING
327 sin6.sin6_scope_id = 0; /* XXX */
330 rt = rtlookup((struct sockaddr *)&sin6, 0, 0UL);
331 if (!rt || rt->rt_ifp != ifp) {
333 log(LOG_WARNING, "%s: packet from %s dropped "
334 "due to ingress filter\n", if_name(&sc->gif_if),
335 ip6_sprintf(&sin6.sin6_addr));
348 * we know that we are in IFF_UP, outer address available, and outer family
349 * matched the physical addr family. see gif_encapcheck().
350 * sanity check for arg should have been done in the caller.
353 gif_encapcheck6(const struct mbuf *m, int off, int proto, void *arg)
356 struct gif_softc *sc;
359 /* sanity check done in caller */
360 sc = (struct gif_softc *)arg;
362 m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6);
363 ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
365 return gif_validate6(&ip6, sc, ifp);
369 in6_gif_attach(struct gif_softc *sc)
371 sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck,
372 (struct protosw *)&in6_gif_protosw, sc);
373 if (sc->encap_cookie6 == NULL)
379 in6_gif_detach(struct gif_softc *sc)
383 error = encap_detach(sc->encap_cookie6);
385 sc->encap_cookie6 = NULL;