2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * $KAME: in6_gif.c,v 1.49 2001/05/14 14:02:17 itojun Exp $
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
36 #include "opt_inet6.h"
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/socket.h>
41 #include <sys/sockio.h>
43 #include <sys/errno.h>
44 #include <sys/queue.h>
45 #include <sys/syslog.h>
46 #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/if_gif.h>
72 static int gif_validate6(const struct ip6_hdr *, struct gif_softc *,
75 extern struct domain inet6domain;
76 struct ip6protosw in6_gif_protosw = {
78 .pr_domain = &inet6domain,
79 .pr_protocol = 0, /* IPPROTO_IPV[46] */
80 .pr_flags = PR_ATOMIC|PR_ADDR,
81 .pr_input = in6_gif_input,
82 .pr_output = rip6_output,
83 .pr_ctloutput = rip6_ctloutput,
84 .pr_usrreqs = &rip6_usrreqs
88 in6_gif_output(struct ifnet *ifp,
89 int family, /* family of the packet to be encapsulate */
92 struct gif_softc *sc = ifp->if_softc;
93 struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst;
94 struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc;
95 struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst;
97 struct etherip_header eiphdr;
98 int error, len, proto;
103 if (sin6_src == NULL || sin6_dst == NULL ||
104 sin6_src->sin6_family != AF_INET6 ||
105 sin6_dst->sin6_family != AF_INET6) {
116 proto = IPPROTO_IPV4;
117 if (m->m_len < sizeof(*ip)) {
118 m = m_pullup(m, sizeof(*ip));
122 ip = mtod(m, struct ip *);
131 proto = IPPROTO_IPV6;
132 if (m->m_len < sizeof(*ip6)) {
133 m = m_pullup(m, sizeof(*ip6));
137 ip6 = mtod(m, struct ip6_hdr *);
138 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
143 proto = IPPROTO_ETHERIP;
146 * GIF_SEND_REVETHIP (disabled by default) intentionally
147 * sends an EtherIP packet with revered version field in
148 * the header. This is a knob for backward compatibility
149 * with FreeBSD 7.2R or prior.
151 if ((sc->gif_options & GIF_SEND_REVETHIP)) {
153 eiphdr.eip_resvl = ETHERIP_VERSION;
154 eiphdr.eip_resvh = 0;
156 eiphdr.eip_ver = ETHERIP_VERSION;
157 eiphdr.eip_resvl = 0;
158 eiphdr.eip_resvh = 0;
160 /* prepend Ethernet-in-IP header */
161 M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT);
162 if (m && m->m_len < sizeof(struct etherip_header))
163 m = m_pullup(m, sizeof(struct etherip_header));
166 bcopy(&eiphdr, mtod(m, struct etherip_header *),
167 sizeof(struct etherip_header));
172 printf("in6_gif_output: warning: unknown family %d passed\n",
179 /* prepend new IP header */
180 len = sizeof(struct ip6_hdr);
181 #ifndef __NO_STRICT_ALIGNMENT
182 if (family == AF_LINK)
183 len += ETHERIP_ALIGN;
185 M_PREPEND(m, len, M_DONTWAIT);
186 if (m != NULL && m->m_len < len)
187 m = m_pullup(m, len);
189 printf("ENOBUFS in in6_gif_output %d\n", __LINE__);
192 #ifndef __NO_STRICT_ALIGNMENT
193 if (family == AF_LINK) {
194 len = mtod(m, vm_offset_t) & 3;
195 KASSERT(len == 0 || len == ETHERIP_ALIGN,
196 ("in6_gif_output: unexpected misalignment"));
198 m->m_len -= ETHERIP_ALIGN;
202 ip6 = mtod(m, struct ip6_hdr *);
204 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
205 ip6->ip6_vfc |= IPV6_VERSION;
206 ip6->ip6_plen = htons((u_short)m->m_pkthdr.len);
207 ip6->ip6_nxt = proto;
208 ip6->ip6_hlim = V_ip6_gif_hlim;
209 ip6->ip6_src = sin6_src->sin6_addr;
210 /* bidirectional configured tunnel mode */
211 if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr))
212 ip6->ip6_dst = sin6_dst->sin6_addr;
217 ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE,
219 ip6->ip6_flow &= ~htonl(0xff << 20);
220 ip6->ip6_flow |= htonl((u_int32_t)otos << 20);
222 if (dst->sin6_family != sin6_dst->sin6_family ||
223 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) {
224 /* cache route doesn't match */
225 bzero(dst, sizeof(*dst));
226 dst->sin6_family = sin6_dst->sin6_family;
227 dst->sin6_len = sizeof(struct sockaddr_in6);
228 dst->sin6_addr = sin6_dst->sin6_addr;
229 if (sc->gif_ro6.ro_rt) {
230 RTFREE(sc->gif_ro6.ro_rt);
231 sc->gif_ro6.ro_rt = NULL;
234 GIF2IFP(sc)->if_mtu = GIF_MTU;
238 if (sc->gif_ro6.ro_rt == NULL) {
239 rtalloc((struct route *)&sc->gif_ro6);
240 if (sc->gif_ro6.ro_rt == NULL) {
245 /* if it constitutes infinite encapsulation, punt. */
246 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
248 return ENETUNREACH; /*XXX*/
251 ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu
252 - sizeof(struct ip6_hdr);
258 * force fragmentation to minimum MTU, to avoid path MTU discovery.
259 * it is too painful to ask for resend of inner packet, to achieve
260 * path MTU discovery for encapsulated packets.
262 error = ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL);
264 error = ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL);
267 if (!(GIF2IFP(sc)->if_flags & IFF_LINK0) &&
268 sc->gif_ro6.ro_rt != NULL) {
269 RTFREE(sc->gif_ro6.ro_rt);
270 sc->gif_ro6.ro_rt = NULL;
277 in6_gif_input(struct mbuf **mp, int *offp, int proto)
279 struct mbuf *m = *mp;
280 struct ifnet *gifp = NULL;
281 struct gif_softc *sc;
286 ip6 = mtod(m, struct ip6_hdr *);
288 sc = (struct gif_softc *)encap_getarg(m);
291 V_ip6stat.ip6s_nogif++;
296 if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
298 V_ip6stat.ip6s_nogif++;
302 otos = ip6->ip6_flow;
312 otos8 = (ntohl(otos) >> 20) & 0xff;
313 if (m->m_len < sizeof(*ip)) {
314 m = m_pullup(m, sizeof(*ip));
318 ip = mtod(m, struct ip *);
319 if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ?
320 ECN_ALLOWED : ECN_NOCARE,
321 &otos8, &ip->ip_tos) == 0) {
333 if (m->m_len < sizeof(*ip6)) {
334 m = m_pullup(m, sizeof(*ip6));
338 ip6 = mtod(m, struct ip6_hdr *);
339 if (ip6_ecn_egress((gifp->if_flags & IFF_LINK1) ?
340 ECN_ALLOWED : ECN_NOCARE,
341 &otos, &ip6->ip6_flow) == 0) {
348 case IPPROTO_ETHERIP:
353 V_ip6stat.ip6s_nogif++;
358 gif_input(m, af, gifp);
363 * validate outer address.
366 gif_validate6(const struct ip6_hdr *ip6, struct gif_softc *sc,
369 struct sockaddr_in6 *src, *dst;
371 src = (struct sockaddr_in6 *)sc->gif_psrc;
372 dst = (struct sockaddr_in6 *)sc->gif_pdst;
375 * Check for address match. Note that the check is for an incoming
376 * packet. We should compare the *source* address in our configuration
377 * and the *destination* address of the packet, and vice versa.
379 if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) ||
380 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src))
383 /* martian filters on outer source - done in ip6_input */
385 /* ingress filters on outer source */
386 if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) {
387 struct sockaddr_in6 sin6;
390 bzero(&sin6, sizeof(sin6));
391 sin6.sin6_family = AF_INET6;
392 sin6.sin6_len = sizeof(struct sockaddr_in6);
393 sin6.sin6_addr = ip6->ip6_src;
394 sin6.sin6_scope_id = 0; /* XXX */
396 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
397 if (!rt || rt->rt_ifp != ifp) {
399 char ip6buf[INET6_ADDRSTRLEN];
400 log(LOG_WARNING, "%s: packet from %s dropped "
401 "due to ingress filter\n", if_name(GIF2IFP(sc)),
402 ip6_sprintf(ip6buf, &sin6.sin6_addr));
415 * we know that we are in IFF_UP, outer address available, and outer family
416 * matched the physical addr family. see gif_encapcheck().
417 * sanity check for arg should have been done in the caller.
420 gif_encapcheck6(const struct mbuf *m, int off, int proto, void *arg)
423 struct gif_softc *sc;
426 /* sanity check done in caller */
427 sc = (struct gif_softc *)arg;
429 /* LINTED const cast */
430 m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6);
431 ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
433 return gif_validate6(&ip6, sc, ifp);
437 in6_gif_attach(struct gif_softc *sc)
439 sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck,
440 (void *)&in6_gif_protosw, sc);
441 if (sc->encap_cookie6 == NULL)
447 in6_gif_detach(struct gif_softc *sc)
451 error = encap_detach(sc->encap_cookie6);
453 sc->encap_cookie6 = NULL;