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: in_gif.c,v 1.54 2001/05/14 14:02:16 itojun Exp $
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
36 #include "opt_inet6.h"
38 #include <sys/param.h>
40 #include <sys/rmlock.h>
41 #include <sys/systm.h>
42 #include <sys/socket.h>
43 #include <sys/sockio.h>
45 #include <sys/errno.h>
46 #include <sys/kernel.h>
47 #include <sys/sysctl.h>
48 #include <sys/protosw.h>
49 #include <sys/malloc.h>
52 #include <net/if_var.h>
53 #include <net/route.h>
56 #include <netinet/in.h>
57 #include <netinet/in_systm.h>
58 #include <netinet/ip.h>
59 #include <netinet/ip_var.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/if_gif.h>
70 int in_gif_output(struct ifnet *, struct mbuf *, int, uint8_t);
71 int in_gif_encapcheck(const struct mbuf *, int, int, void *);
72 int in_gif_attach(struct gif_softc *);
74 static int gif_validate4(const struct ip *, struct gif_softc *,
76 static int in_gif_input(struct mbuf **, int *, int);
78 extern struct domain inetdomain;
79 static struct protosw in_gif_protosw = {
81 .pr_domain = &inetdomain,
82 .pr_protocol = 0/* IPPROTO_IPV[46] */,
83 .pr_flags = PR_ATOMIC|PR_ADDR,
84 .pr_input = in_gif_input,
85 .pr_output = rip_output,
86 .pr_ctloutput = rip_ctloutput,
87 .pr_usrreqs = &rip_usrreqs
91 static VNET_DEFINE(int, ip_gif_ttl) = GIF_TTL;
92 #define V_ip_gif_ttl VNET(ip_gif_ttl)
93 SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_VNET | CTLFLAG_RW,
94 &VNET_NAME(ip_gif_ttl), 0, "");
97 in_gif_output(struct ifnet *ifp, struct mbuf *m, int proto, uint8_t ecn)
100 struct gif_softc *sc = ifp->if_softc;
104 /* prepend new IP header */
105 len = sizeof(struct ip);
106 #ifndef __NO_STRICT_ALIGNMENT
107 if (proto == IPPROTO_ETHERIP)
108 len += ETHERIP_ALIGN;
110 M_PREPEND(m, len, M_NOWAIT);
113 #ifndef __NO_STRICT_ALIGNMENT
114 if (proto == IPPROTO_ETHERIP) {
115 len = mtod(m, vm_offset_t) & 3;
116 KASSERT(len == 0 || len == ETHERIP_ALIGN,
117 ("in_gif_output: unexpected misalignment"));
119 m->m_len -= ETHERIP_ALIGN;
122 ip = mtod(m, struct ip *);
124 if (sc->gif_family != AF_INET) {
129 bcopy(sc->gif_iphdr, ip, sizeof(struct ip));
133 /* version will be set in ip_output() */
134 ip->ip_ttl = V_ip_gif_ttl;
135 ip->ip_len = htons(m->m_pkthdr.len);
138 return (ip_output(m, NULL, NULL, 0, NULL, NULL));
142 in_gif_input(struct mbuf **mp, int *offp, int proto)
144 struct mbuf *m = *mp;
145 struct gif_softc *sc;
150 sc = encap_getarg(m);
153 KMOD_IPSTAT_INC(ips_nogif);
154 return (IPPROTO_DONE);
157 if ((gifp->if_flags & IFF_UP) != 0) {
158 ip = mtod(m, struct ip *);
161 gif_input(m, gifp, proto, ecn);
164 KMOD_IPSTAT_INC(ips_nogif);
166 return (IPPROTO_DONE);
170 * validate outer address.
173 gif_validate4(const struct ip *ip, struct gif_softc *sc, struct ifnet *ifp)
176 GIF_RLOCK_ASSERT(sc);
178 /* check for address match */
179 if (sc->gif_iphdr->ip_src.s_addr != ip->ip_dst.s_addr ||
180 sc->gif_iphdr->ip_dst.s_addr != ip->ip_src.s_addr)
183 /* martian filters on outer source - NOT done in ip_input! */
184 if (IN_MULTICAST(ntohl(ip->ip_src.s_addr)))
186 switch ((ntohl(ip->ip_src.s_addr) & 0xff000000) >> 24) {
193 /* ingress filters on outer source */
194 if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) {
195 struct sockaddr_in sin;
198 bzero(&sin, sizeof(sin));
199 sin.sin_family = AF_INET;
200 sin.sin_len = sizeof(struct sockaddr_in);
201 sin.sin_addr = ip->ip_src;
202 /* XXX MRT check for the interface we would use on output */
203 rt = in_rtalloc1((struct sockaddr *)&sin, 0,
204 0UL, sc->gif_fibnum);
205 if (!rt || rt->rt_ifp != ifp) {
216 * we know that we are in IFF_UP, outer address available, and outer family
217 * matched the physical addr family. see gif_encapcheck().
220 in_gif_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
223 struct gif_softc *sc;
226 /* sanity check done in caller */
227 sc = (struct gif_softc *)arg;
228 GIF_RLOCK_ASSERT(sc);
230 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip);
231 ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
232 return (gif_validate4(&ip, sc, ifp));
236 in_gif_attach(struct gif_softc *sc)
239 KASSERT(sc->gif_ecookie == NULL, ("gif_ecookie isn't NULL"));
240 sc->gif_ecookie = encap_attach_func(AF_INET, -1, gif_encapcheck,
241 &in_gif_protosw, sc);
242 if (sc->gif_ecookie == NULL)