2 * $FreeBSD: src/sys/netinet/in_gif.c,v 1.5.2.11 2003/01/23 21:06:45 sam Exp $
3 * $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 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/kernel.h>
44 #include <sys/sysctl.h>
45 #include <sys/protosw.h>
47 #include <sys/malloc.h>
49 #include <machine/stdarg.h>
52 #include <net/route.h>
54 #include <netinet/in.h>
55 #include <netinet/in_systm.h>
56 #include <netinet/ip.h>
57 #include <netinet/ip_var.h>
58 #include <netinet/in_gif.h>
59 #include <netinet/in_var.h>
60 #include <netinet/ip_encap.h>
61 #include <netinet/ip_ecn.h>
64 #include <netinet/ip6.h>
67 #include <net/gif/if_gif.h>
68 #include <net/net_osdep.h>
70 #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 =
80 .pr_domain = &inetdomain,
81 .pr_protocol = 0 /*IPPROTO_IPV[46]*/,
82 .pr_flags = PR_ATOMIC|PR_ADDR,
84 .pr_input = in_gif_input,
85 .pr_output = rip_output,
87 .pr_ctloutput = rip_ctloutput,
90 .pr_usrreqs = &rip_usrreqs
93 int ip_gif_ttl = GIF_TTL;
94 SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
95 &ip_gif_ttl, 0, "TTL of GIF packet");
98 in_gif_output(struct ifnet *ifp, int family, struct mbuf *m)
100 struct gif_softc *sc = (struct gif_softc*)ifp;
101 struct route *ro = &sc->gif_ro[mycpu->gd_cpuid];
102 struct sockaddr_in *dst = (struct sockaddr_in *)&ro->ro_dst;
103 struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
104 struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
105 struct ip iphdr; /* capsule IP header, host byte ordered */
109 if (sin_src == NULL || sin_dst == NULL ||
110 sin_src->sin_family != AF_INET ||
111 sin_dst->sin_family != AF_INET) {
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 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
150 kprintf("in_gif_output: warning: unknown family %d passed\n",
157 bzero(&iphdr, sizeof iphdr);
158 iphdr.ip_src = sin_src->sin_addr;
159 /* bidirectional configured tunnel mode */
160 if (sin_dst->sin_addr.s_addr != INADDR_ANY)
161 iphdr.ip_dst = sin_dst->sin_addr;
167 /* version will be set in ip_output() */
168 iphdr.ip_ttl = ip_gif_ttl;
169 iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
170 if (ifp->if_flags & IFF_LINK1)
171 ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos);
173 ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos);
175 /* prepend new IP header */
176 M_PREPEND(m, sizeof(struct ip), M_NOWAIT);
177 if (m && m->m_len < sizeof(struct ip))
178 m = m_pullup(m, sizeof(struct ip));
180 kprintf("ENOBUFS in in_gif_output %d\n", __LINE__);
183 bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
185 if (dst->sin_family != sin_dst->sin_family ||
186 dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
187 /* cache route doesn't match */
188 dst->sin_family = sin_dst->sin_family;
189 dst->sin_len = sizeof(struct sockaddr_in);
190 dst->sin_addr = sin_dst->sin_addr;
191 if (ro->ro_rt != NULL) {
196 sc->gif_if.if_mtu = GIF_MTU;
200 if (ro->ro_rt == NULL) {
202 if (ro->ro_rt == NULL) {
207 /* if it constitutes infinite encapsulation, punt. */
208 if (ro->ro_rt->rt_ifp == ifp) {
210 return ENETUNREACH; /* XXX */
213 ifp->if_mtu = ro->ro_rt->rt_ifp->if_mtu - sizeof(struct ip);
217 error = ip_output(m, NULL, ro, 0, NULL, NULL);
222 in_gif_input(struct mbuf **mp, int *offp, int proto)
224 struct mbuf *m = *mp;
225 struct ifnet *gifp = NULL;
234 ip = mtod(m, struct ip *);
236 gifp = (struct ifnet *)encap_getarg(m);
238 if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
241 return(IPPROTO_DONE);
253 if (m->m_len < sizeof *ip) {
254 m = m_pullup(m, sizeof *ip);
256 return(IPPROTO_DONE);
258 ip = mtod(m, struct ip *);
259 if (gifp->if_flags & IFF_LINK1)
260 ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos);
262 ip_ecn_egress(ECN_NOCARE, &otos, &ip->ip_tos);
272 if (m->m_len < sizeof *ip6) {
273 m = m_pullup(m, sizeof *ip6);
275 return(IPPROTO_DONE);
277 ip6 = mtod(m, struct ip6_hdr *);
278 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
279 if (gifp->if_flags & IFF_LINK1)
280 ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
282 ip_ecn_egress(ECN_NOCARE, &otos, &itos);
283 ip6->ip6_flow &= ~htonl(0xff << 20);
284 ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
291 return(IPPROTO_DONE);
293 gif_input(m, af, gifp);
294 return(IPPROTO_DONE);
298 * validate outer address.
301 gif_validate4(const struct ip *ip, struct gif_softc *sc, struct ifnet *ifp)
303 struct sockaddr_in *src, *dst;
304 struct in_ifaddr_container *iac;
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 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
323 struct in_ifaddr *ia4 = iac->ia;
325 if (!(ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST))
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) && ifp != NULL) {
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 = rtpurelookup((struct sockaddr *)&sin);
343 if (rt == NULL || rt->rt_ifp != ifp) {
345 log(LOG_WARNING, "%s: packet from 0x%x dropped "
346 "due to ingress filter\n", if_name(&sc->gif_if),
347 (u_int32_t)ntohl(sin.sin_addr.s_addr));
357 * we know that we are in IFF_UP, outer address available, and outer family
358 * matched the physical addr family. see gif_encapcheck().
361 gif_encapcheck4(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 /* LINTED const cast */
371 m_copydata(__DECONST(struct mbuf *, m), 0, sizeof ip, (caddr_t)&ip);
372 ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
374 return gif_validate4(&ip, sc, ifp);
378 in_gif_attach(struct gif_softc *sc)
380 sc->encap_cookie4 = encap_attach_func(AF_INET, -1, gif_encapcheck,
381 &in_gif_protosw, sc);
382 if (sc->encap_cookie4 == NULL)
388 in_gif_detach(struct gif_softc *sc)
392 error = encap_detach(sc->encap_cookie4);
394 sc->encap_cookie4 = NULL;