2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 itojun Exp $
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
38 #include "opt_inet6.h"
40 #include <sys/param.h>
42 #include <sys/rmlock.h>
43 #include <sys/systm.h>
44 #include <sys/socket.h>
45 #include <sys/sockio.h>
47 #include <sys/errno.h>
48 #include <sys/kernel.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>
60 #include <netinet/ip.h>
61 #include <netinet/ip_var.h>
62 #include <netinet/in_var.h>
63 #include <netinet/ip_encap.h>
64 #include <netinet/ip_ecn.h>
65 #include <netinet/in_fib.h>
68 #include <netinet/ip6.h>
71 #include <net/if_gif.h>
73 static int in_gif_input(struct mbuf **, int *, int);
75 extern struct domain inetdomain;
76 static struct protosw in_gif_protosw = {
78 .pr_domain = &inetdomain,
79 .pr_protocol = 0/* IPPROTO_IPV[46] */,
80 .pr_flags = PR_ATOMIC|PR_ADDR,
81 .pr_input = in_gif_input,
82 .pr_output = rip_output,
83 .pr_ctloutput = rip_ctloutput,
84 .pr_usrreqs = &rip_usrreqs
88 static VNET_DEFINE(int, ip_gif_ttl) = GIF_TTL;
89 #define V_ip_gif_ttl VNET(ip_gif_ttl)
90 SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_VNET | CTLFLAG_RW,
91 &VNET_NAME(ip_gif_ttl), 0, "");
94 in_gif_output(struct ifnet *ifp, struct mbuf *m, int proto, uint8_t ecn)
97 struct gif_softc *sc = ifp->if_softc;
101 /* prepend new IP header */
102 len = sizeof(struct ip);
103 #ifndef __NO_STRICT_ALIGNMENT
104 if (proto == IPPROTO_ETHERIP)
105 len += ETHERIP_ALIGN;
107 M_PREPEND(m, len, M_NOWAIT);
110 #ifndef __NO_STRICT_ALIGNMENT
111 if (proto == IPPROTO_ETHERIP) {
112 len = mtod(m, vm_offset_t) & 3;
113 KASSERT(len == 0 || len == ETHERIP_ALIGN,
114 ("in_gif_output: unexpected misalignment"));
116 m->m_len -= ETHERIP_ALIGN;
119 ip = mtod(m, struct ip *);
121 if (sc->gif_family != AF_INET) {
126 bcopy(sc->gif_iphdr, ip, sizeof(struct ip));
130 /* version will be set in ip_output() */
131 ip->ip_ttl = V_ip_gif_ttl;
132 ip->ip_len = htons(m->m_pkthdr.len);
135 return (ip_output(m, NULL, NULL, 0, NULL, NULL));
139 in_gif_input(struct mbuf **mp, int *offp, int proto)
141 struct mbuf *m = *mp;
142 struct gif_softc *sc;
147 sc = encap_getarg(m);
150 KMOD_IPSTAT_INC(ips_nogif);
151 return (IPPROTO_DONE);
154 if ((gifp->if_flags & IFF_UP) != 0) {
155 ip = mtod(m, struct ip *);
158 gif_input(m, gifp, proto, ecn);
161 KMOD_IPSTAT_INC(ips_nogif);
163 return (IPPROTO_DONE);
167 * we know that we are in IFF_UP, outer address available, and outer family
168 * matched the physical addr family. see gif_encapcheck().
171 in_gif_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
174 struct gif_softc *sc;
177 /* sanity check done in caller */
178 sc = (struct gif_softc *)arg;
179 GIF_RLOCK_ASSERT(sc);
181 /* check for address match */
182 ip = mtod(m, const struct ip *);
183 if (sc->gif_iphdr->ip_src.s_addr != ip->ip_dst.s_addr)
186 if (sc->gif_iphdr->ip_dst.s_addr != ip->ip_src.s_addr) {
187 if ((sc->gif_options & GIF_IGNORE_SOURCE) == 0)
192 /* ingress filters on outer source */
193 if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0) {
194 struct nhop4_basic nh4;
199 if (fib4_lookup_nh_basic(sc->gif_fibnum, dst, 0, 0, &nh4) != 0)
202 if (nh4.nh_ifp != m->m_pkthdr.rcvif)
209 in_gif_attach(struct gif_softc *sc)
212 KASSERT(sc->gif_ecookie == NULL, ("gif_ecookie isn't NULL"));
213 sc->gif_ecookie = encap_attach_func(AF_INET, -1, gif_encapcheck,
214 &in_gif_protosw, sc);
215 if (sc->gif_ecookie == NULL)