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 1.13 2005/01/06 17:59:32 hsu 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 const 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(struct ifnet *ifp, int family, struct mbuf *m)
92 struct gif_softc *sc = (struct gif_softc*)ifp;
93 struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst;
94 struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
95 struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
96 struct ip iphdr; /* capsule IP header, host byte ordered */
100 if (sin_src == NULL || sin_dst == NULL ||
101 sin_src->sin_family != AF_INET ||
102 sin_dst->sin_family != AF_INET) {
113 proto = IPPROTO_IPV4;
114 if (m->m_len < sizeof *ip) {
115 m = m_pullup(m, sizeof *ip);
119 ip = mtod(m, struct ip *);
128 proto = IPPROTO_IPV6;
129 if (m->m_len < sizeof *ip6) {
130 m = m_pullup(m, sizeof *ip6);
134 ip6 = mtod(m, struct ip6_hdr *);
135 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
141 printf("in_gif_output: warning: unknown family %d passed\n",
148 bzero(&iphdr, sizeof iphdr);
149 iphdr.ip_src = sin_src->sin_addr;
150 /* bidirectional configured tunnel mode */
151 if (sin_dst->sin_addr.s_addr != INADDR_ANY)
152 iphdr.ip_dst = sin_dst->sin_addr;
158 /* version will be set in ip_output() */
159 iphdr.ip_ttl = ip_gif_ttl;
160 iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
161 if (ifp->if_flags & IFF_LINK1)
162 ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos);
164 ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos);
166 /* prepend new IP header */
167 M_PREPEND(m, sizeof(struct ip), MB_DONTWAIT);
168 if (m && m->m_len < sizeof(struct ip))
169 m = m_pullup(m, sizeof(struct ip));
171 printf("ENOBUFS in in_gif_output %d\n", __LINE__);
174 bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
176 if (dst->sin_family != sin_dst->sin_family ||
177 dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
178 /* cache route doesn't match */
179 dst->sin_family = sin_dst->sin_family;
180 dst->sin_len = sizeof(struct sockaddr_in);
181 dst->sin_addr = sin_dst->sin_addr;
182 if (sc->gif_ro.ro_rt) {
183 RTFREE(sc->gif_ro.ro_rt);
184 sc->gif_ro.ro_rt = NULL;
187 sc->gif_if.if_mtu = GIF_MTU;
191 if (sc->gif_ro.ro_rt == NULL) {
192 rtalloc(&sc->gif_ro);
193 if (sc->gif_ro.ro_rt == NULL) {
198 /* if it constitutes infinite encapsulation, punt. */
199 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
201 return ENETUNREACH; /* XXX */
204 ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu -
209 error = ip_output(m, NULL, &sc->gif_ro, 0, NULL, NULL);
214 in_gif_input(struct mbuf *m, ...)
216 struct ifnet *gifp = NULL;
224 off = __va_arg(ap, int);
225 proto = __va_arg(ap, int);
228 ip = mtod(m, struct ip *);
230 gifp = (struct ifnet *)encap_getarg(m);
232 if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
247 if (m->m_len < sizeof *ip) {
248 m = m_pullup(m, sizeof *ip);
252 ip = mtod(m, struct ip *);
253 if (gifp->if_flags & IFF_LINK1)
254 ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos);
256 ip_ecn_egress(ECN_NOCARE, &otos, &ip->ip_tos);
266 if (m->m_len < sizeof *ip6) {
267 m = m_pullup(m, sizeof *ip6);
271 ip6 = mtod(m, struct ip6_hdr *);
272 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
273 if (gifp->if_flags & IFF_LINK1)
274 ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
276 ip_ecn_egress(ECN_NOCARE, &otos, &itos);
277 ip6->ip6_flow &= ~htonl(0xff << 20);
278 ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
287 gif_input(m, af, gifp);
292 * validate outer address.
295 gif_validate4(const struct ip *ip, struct gif_softc *sc, struct ifnet *ifp)
297 struct sockaddr_in *src, *dst;
298 struct in_ifaddr *ia4;
300 src = (struct sockaddr_in *)sc->gif_psrc;
301 dst = (struct sockaddr_in *)sc->gif_pdst;
303 /* check for address match */
304 if (src->sin_addr.s_addr != ip->ip_dst.s_addr ||
305 dst->sin_addr.s_addr != ip->ip_src.s_addr)
308 /* martian filters on outer source - NOT done in ip_input! */
309 if (IN_MULTICAST(ntohl(ip->ip_src.s_addr)))
311 switch ((ntohl(ip->ip_src.s_addr) & 0xff000000) >> 24) {
312 case 0: case 127: case 255:
315 /* reject packets with broadcast on source */
316 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); ia4;
317 ia4 = TAILQ_NEXT(ia4, ia_link))
319 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
321 if (ip->ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr)
325 /* ingress filters on outer source */
326 if ((sc->gif_if.if_flags & IFF_LINK2) == 0 && ifp) {
327 struct sockaddr_in sin;
330 bzero(&sin, sizeof sin);
331 sin.sin_family = AF_INET;
332 sin.sin_len = sizeof(struct sockaddr_in);
333 sin.sin_addr = ip->ip_src;
334 rt = rtpurelookup((struct sockaddr *)&sin);
335 if (!rt || rt->rt_ifp != ifp) {
337 log(LOG_WARNING, "%s: packet from 0x%x dropped "
338 "due to ingress filter\n", if_name(&sc->gif_if),
339 (u_int32_t)ntohl(sin.sin_addr.s_addr));
352 * we know that we are in IFF_UP, outer address available, and outer family
353 * matched the physical addr family. see gif_encapcheck().
356 gif_encapcheck4(const struct mbuf *m, int off, int proto, void *arg)
359 struct gif_softc *sc;
362 /* sanity check done in caller */
363 sc = (struct gif_softc *)arg;
365 /* LINTED const cast */
366 m_copydata(__DECONST(struct mbuf *, m), 0, sizeof ip, (caddr_t)&ip);
367 ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
369 return gif_validate4(&ip, sc, ifp);
373 in_gif_attach(struct gif_softc *sc)
375 sc->encap_cookie4 = encap_attach_func(AF_INET, -1, gif_encapcheck,
376 &in_gif_protosw, sc);
377 if (sc->encap_cookie4 == NULL)
383 in_gif_detach(struct gif_softc *sc)
387 error = encap_detach(sc->encap_cookie4);
389 sc->encap_cookie4 = NULL;