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
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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>
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/queue.h>
48 #include <sys/syslog.h>
49 #include <sys/sysctl.h>
50 #include <sys/protosw.h>
51 #include <sys/malloc.h>
54 #include <net/if_var.h>
55 #include <net/route.h>
58 #include <netinet/in.h>
59 #include <netinet/in_systm.h>
61 #include <netinet/ip.h>
63 #include <netinet/ip_encap.h>
65 #include <netinet/ip6.h>
66 #include <netinet6/ip6_var.h>
67 #include <netinet6/in6_var.h>
69 #include <netinet/ip_ecn.h>
71 #include <netinet6/ip6_ecn.h>
74 #include <net/if_gif.h>
77 static VNET_DEFINE(int, ip6_gif_hlim) = GIF_HLIM;
78 #define V_ip6_gif_hlim VNET(ip6_gif_hlim)
80 SYSCTL_DECL(_net_inet6_ip6);
81 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_GIF_HLIM, gifhlim, CTLFLAG_VNET | CTLFLAG_RW,
82 &VNET_NAME(ip6_gif_hlim), 0, "");
84 static int gif_validate6(const struct ip6_hdr *, struct gif_softc *,
86 static int in6_gif_input(struct mbuf **, int *, int);
88 extern struct domain inet6domain;
89 static struct protosw in6_gif_protosw = {
91 .pr_domain = &inet6domain,
92 .pr_protocol = 0, /* IPPROTO_IPV[46] */
93 .pr_flags = PR_ATOMIC|PR_ADDR,
94 .pr_input = in6_gif_input,
95 .pr_output = rip6_output,
96 .pr_ctloutput = rip6_ctloutput,
97 .pr_usrreqs = &rip6_usrreqs
101 in6_gif_output(struct ifnet *ifp, struct mbuf *m, int proto, uint8_t ecn)
104 struct gif_softc *sc = ifp->if_softc;
108 /* prepend new IP header */
109 len = sizeof(struct ip6_hdr);
110 #ifndef __NO_STRICT_ALIGNMENT
111 if (proto == IPPROTO_ETHERIP)
112 len += ETHERIP_ALIGN;
114 M_PREPEND(m, len, M_NOWAIT);
117 #ifndef __NO_STRICT_ALIGNMENT
118 if (proto == IPPROTO_ETHERIP) {
119 len = mtod(m, vm_offset_t) & 3;
120 KASSERT(len == 0 || len == ETHERIP_ALIGN,
121 ("in6_gif_output: unexpected misalignment"));
123 m->m_len -= ETHERIP_ALIGN;
127 ip6 = mtod(m, struct ip6_hdr *);
129 if (sc->gif_family != AF_INET6) {
134 bcopy(sc->gif_ip6hdr, ip6, sizeof(struct ip6_hdr));
137 ip6->ip6_flow |= htonl((uint32_t)ecn << 20);
138 ip6->ip6_nxt = proto;
139 ip6->ip6_hlim = V_ip6_gif_hlim;
141 * force fragmentation to minimum MTU, to avoid path MTU discovery.
142 * it is too painful to ask for resend of inner packet, to achieve
143 * path MTU discovery for encapsulated packets.
145 return (ip6_output(m, 0, NULL, IPV6_MINMTU, 0, NULL, NULL));
149 in6_gif_input(struct mbuf **mp, int *offp, int proto)
151 struct mbuf *m = *mp;
153 struct gif_softc *sc;
157 sc = encap_getarg(m);
160 IP6STAT_INC(ip6s_nogif);
161 return (IPPROTO_DONE);
164 if ((gifp->if_flags & IFF_UP) != 0) {
165 ip6 = mtod(m, struct ip6_hdr *);
166 ecn = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
168 gif_input(m, gifp, proto, ecn);
171 IP6STAT_INC(ip6s_nogif);
173 return (IPPROTO_DONE);
177 * validate outer address.
180 gif_validate6(const struct ip6_hdr *ip6, struct gif_softc *sc,
185 GIF_RLOCK_ASSERT(sc);
187 * Check for address match. Note that the check is for an incoming
188 * packet. We should compare the *source* address in our configuration
189 * and the *destination* address of the packet, and vice versa.
191 if (!IN6_ARE_ADDR_EQUAL(&sc->gif_ip6hdr->ip6_src, &ip6->ip6_dst))
194 if (!IN6_ARE_ADDR_EQUAL(&sc->gif_ip6hdr->ip6_dst, &ip6->ip6_src)) {
195 if ((sc->gif_options & GIF_IGNORE_SOURCE) == 0)
200 /* martian filters on outer source - done in ip6_input */
202 /* ingress filters on outer source */
203 if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) {
204 struct sockaddr_in6 sin6;
207 bzero(&sin6, sizeof(sin6));
208 sin6.sin6_family = AF_INET6;
209 sin6.sin6_len = sizeof(struct sockaddr_in6);
210 sin6.sin6_addr = ip6->ip6_src;
211 sin6.sin6_scope_id = 0; /* XXX */
213 rt = in6_rtalloc1((struct sockaddr *)&sin6, 0, 0UL,
215 if (!rt || rt->rt_ifp != ifp) {
227 * we know that we are in IFF_UP, outer address available, and outer family
228 * matched the physical addr family. see gif_encapcheck().
231 in6_gif_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
234 struct gif_softc *sc;
237 /* sanity check done in caller */
238 sc = (struct gif_softc *)arg;
239 GIF_RLOCK_ASSERT(sc);
241 m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6);
242 ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
243 return (gif_validate6(&ip6, sc, ifp));
247 in6_gif_attach(struct gif_softc *sc)
250 KASSERT(sc->gif_ecookie == NULL, ("gif_ecookie isn't NULL"));
251 sc->gif_ecookie = encap_attach_func(AF_INET6, -1, gif_encapcheck,
252 (void *)&in6_gif_protosw, sc);
253 if (sc->gif_ecookie == NULL)