2 * $FreeBSD: src/sys/netinet/in_gif.c,v 1.5.2.11 2003/01/23 21:06:45 sam Exp $
3 * $DragonFly: src/sys/netinet/in_gif.c,v 1.10 2004/06/03 18:30:03 joerg Exp $
4 * $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 itojun Exp $
7 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the project nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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/kernel.h>
45 #include <sys/sysctl.h>
46 #include <sys/protosw.h>
48 #include <sys/malloc.h>
50 #include <machine/stdarg.h>
53 #include <net/route.h>
55 #include <netinet/in.h>
56 #include <netinet/in_systm.h>
57 #include <netinet/ip.h>
58 #include <netinet/ip_var.h>
59 #include <netinet/in_gif.h>
60 #include <netinet/in_var.h>
61 #include <netinet/ip_encap.h>
62 #include <netinet/ip_ecn.h>
65 #include <netinet/ip6.h>
68 #include <net/gif/if_gif.h>
69 #include <net/net_osdep.h>
71 #include <sys/thread2.h> /* ipstat */
73 static int gif_validate4 (const struct ip *, struct gif_softc *,
76 extern struct domain inetdomain;
77 struct protosw in_gif_protosw =
78 { SOCK_RAW, &inetdomain, 0/*IPPROTO_IPV[46]*/, PR_ATOMIC|PR_ADDR,
79 in_gif_input, rip_output, 0, rip_ctloutput,
85 int ip_gif_ttl = GIF_TTL;
86 SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
90 in_gif_output(ifp, family, m)
95 struct gif_softc *sc = (struct gif_softc*)ifp;
96 struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst;
97 struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
98 struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
99 struct ip iphdr; /* capsule IP header, host byte ordered */
103 if (sin_src == NULL || sin_dst == NULL ||
104 sin_src->sin_family != AF_INET ||
105 sin_dst->sin_family != AF_INET) {
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 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
144 printf("in_gif_output: warning: unknown family %d passed\n",
151 bzero(&iphdr, sizeof(iphdr));
152 iphdr.ip_src = sin_src->sin_addr;
153 /* bidirectional configured tunnel mode */
154 if (sin_dst->sin_addr.s_addr != INADDR_ANY)
155 iphdr.ip_dst = sin_dst->sin_addr;
161 /* version will be set in ip_output() */
162 iphdr.ip_ttl = ip_gif_ttl;
163 iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
164 if (ifp->if_flags & IFF_LINK1)
165 ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos);
167 ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos);
169 /* prepend new IP header */
170 M_PREPEND(m, sizeof(struct ip), MB_DONTWAIT);
171 if (m && m->m_len < sizeof(struct ip))
172 m = m_pullup(m, sizeof(struct ip));
174 printf("ENOBUFS in in_gif_output %d\n", __LINE__);
177 bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
179 if (dst->sin_family != sin_dst->sin_family ||
180 dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
181 /* cache route doesn't match */
182 dst->sin_family = sin_dst->sin_family;
183 dst->sin_len = sizeof(struct sockaddr_in);
184 dst->sin_addr = sin_dst->sin_addr;
185 if (sc->gif_ro.ro_rt) {
186 RTFREE(sc->gif_ro.ro_rt);
187 sc->gif_ro.ro_rt = NULL;
190 sc->gif_if.if_mtu = GIF_MTU;
194 if (sc->gif_ro.ro_rt == NULL) {
195 rtalloc(&sc->gif_ro);
196 if (sc->gif_ro.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_ro.ro_rt->rt_ifp->if_mtu
212 error = ip_output(m, NULL, &sc->gif_ro, 0, NULL, NULL);
217 in_gif_input(struct mbuf *m, ...)
219 struct ifnet *gifp = NULL;
227 off = __va_arg(ap, int);
228 proto = __va_arg(ap, int);
231 ip = mtod(m, struct ip *);
233 gifp = (struct ifnet *)encap_getarg(m);
235 if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
250 if (m->m_len < sizeof(*ip)) {
251 m = m_pullup(m, sizeof(*ip));
255 ip = mtod(m, struct ip *);
256 if (gifp->if_flags & IFF_LINK1)
257 ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos);
259 ip_ecn_egress(ECN_NOCARE, &otos, &ip->ip_tos);
269 if (m->m_len < sizeof(*ip6)) {
270 m = m_pullup(m, sizeof(*ip6));
274 ip6 = mtod(m, struct ip6_hdr *);
275 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
276 if (gifp->if_flags & IFF_LINK1)
277 ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
279 ip_ecn_egress(ECN_NOCARE, &otos, &itos);
280 ip6->ip6_flow &= ~htonl(0xff << 20);
281 ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
290 gif_input(m, af, gifp);
295 * validate outer address.
298 gif_validate4(ip, sc, ifp)
300 struct gif_softc *sc;
303 struct sockaddr_in *src, *dst;
304 struct in_ifaddr *ia4;
306 src = (struct sockaddr_in *)sc->gif_psrc;
307 dst = (struct sockaddr_in *)sc->gif_pdst;
309 /* check for address match */
310 if (src->sin_addr.s_addr != ip->ip_dst.s_addr ||
311 dst->sin_addr.s_addr != ip->ip_src.s_addr)
314 /* martian filters on outer source - NOT done in ip_input! */
315 if (IN_MULTICAST(ntohl(ip->ip_src.s_addr)))
317 switch ((ntohl(ip->ip_src.s_addr) & 0xff000000) >> 24) {
318 case 0: case 127: case 255:
321 /* reject packets with broadcast on source */
322 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); ia4;
323 ia4 = TAILQ_NEXT(ia4, ia_link))
325 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
327 if (ip->ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr)
331 /* ingress filters on outer source */
332 if ((sc->gif_if.if_flags & IFF_LINK2) == 0 && ifp) {
333 struct sockaddr_in sin;
336 bzero(&sin, sizeof(sin));
337 sin.sin_family = AF_INET;
338 sin.sin_len = sizeof(struct sockaddr_in);
339 sin.sin_addr = ip->ip_src;
340 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL);
341 if (!rt || rt->rt_ifp != ifp) {
343 log(LOG_WARNING, "%s: packet from 0x%x dropped "
344 "due to ingress filter\n", if_name(&sc->gif_if),
345 (u_int32_t)ntohl(sin.sin_addr.s_addr));
358 * we know that we are in IFF_UP, outer address available, and outer family
359 * matched the physical addr family. see gif_encapcheck().
362 gif_encapcheck4(m, off, proto, arg)
363 const struct mbuf *m;
369 struct gif_softc *sc;
372 /* sanity check done in caller */
373 sc = (struct gif_softc *)arg;
375 /* LINTED const cast */
376 m_copydata(__DECONST(struct mbuf *, m), 0, sizeof(ip), (caddr_t)&ip);
377 ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
379 return gif_validate4(&ip, sc, ifp);
384 struct gif_softc *sc;
386 sc->encap_cookie4 = encap_attach_func(AF_INET, -1, gif_encapcheck,
387 &in_gif_protosw, sc);
388 if (sc->encap_cookie4 == NULL)
395 struct gif_softc *sc;
399 error = encap_detach(sc->encap_cookie4);
401 sc->encap_cookie4 = NULL;