FreeBSD/Linux Kernel Cross Reference
sys/netinet/in_gif.c
1 /*-
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
16 *
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
27 * SUCH DAMAGE.
28 *
29 * $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 itojun Exp $
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD: releng/10.3/sys/netinet/in_gif.c 284072 2015-06-06 13:26:13Z ae $");
34
35 #include "opt_inet.h"
36 #include "opt_inet6.h"
37
38 #include <sys/param.h>
39 #include <sys/lock.h>
40 #include <sys/rmlock.h>
41 #include <sys/systm.h>
42 #include <sys/socket.h>
43 #include <sys/sockio.h>
44 #include <sys/mbuf.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>
50
51 #include <net/if.h>
52 #include <net/if_var.h>
53 #include <net/route.h>
54 #include <net/vnet.h>
55
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>
63
64 #ifdef INET6
65 #include <netinet/ip6.h>
66 #endif
67
68 #include <net/if_gif.h>
69
70 static int gif_validate4(const struct ip *, struct gif_softc *,
71 struct ifnet *);
72 static int in_gif_input(struct mbuf **, int *, int);
73
74 static void in_gif_input10(struct mbuf *, int);
75 extern struct domain inetdomain;
76 static struct protosw in_gif_protosw = {
77 .pr_type = SOCK_RAW,
78 .pr_domain = &inetdomain,
79 .pr_protocol = 0/* IPPROTO_IPV[46] */,
80 .pr_flags = PR_ATOMIC|PR_ADDR,
81 .pr_input = in_gif_input10,
82 .pr_output = (pr_output_t*)rip_output,
83 .pr_ctloutput = rip_ctloutput,
84 .pr_usrreqs = &rip_usrreqs
85 };
86
87 #define GIF_TTL 30
88 static VNET_DEFINE(int, ip_gif_ttl) = GIF_TTL;
89 #define V_ip_gif_ttl VNET(ip_gif_ttl)
90 SYSCTL_VNET_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
91 &VNET_NAME(ip_gif_ttl), 0, "");
92
93 int
94 in_gif_output(struct ifnet *ifp, struct mbuf *m, int proto, uint8_t ecn)
95 {
96 GIF_RLOCK_TRACKER;
97 struct gif_softc *sc = ifp->if_softc;
98 struct ip *ip;
99 int len;
100
101 /* prepend new IP header */
102 len = sizeof(struct ip);
103 #ifndef __NO_STRICT_ALIGNMENT
104 if (proto == IPPROTO_ETHERIP)
105 len += ETHERIP_ALIGN;
106 #endif
107 M_PREPEND(m, len, M_NOWAIT);
108 if (m == NULL)
109 return (ENOBUFS);
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"));
115 m->m_data += len;
116 m->m_len -= ETHERIP_ALIGN;
117 }
118 #endif
119 ip = mtod(m, struct ip *);
120 GIF_RLOCK(sc);
121 if (sc->gif_family != AF_INET) {
122 m_freem(m);
123 GIF_RUNLOCK(sc);
124 return (ENETDOWN);
125 }
126 bcopy(sc->gif_iphdr, ip, sizeof(struct ip));
127 GIF_RUNLOCK(sc);
128
129 ip->ip_p = proto;
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);
133 ip->ip_tos = ecn;
134
135 return (ip_output(m, NULL, NULL, 0, NULL, NULL));
136 }
137
138 static void
139 in_gif_input10(struct mbuf *m, int off)
140 {
141 int proto;
142
143 proto = (mtod(m, struct ip *))->ip_p;
144 in_gif_input(&m, &off, proto);
145 }
146
147 static int
148 in_gif_input(struct mbuf **mp, int *offp, int proto)
149 {
150 struct mbuf *m = *mp;
151 struct gif_softc *sc;
152 struct ifnet *gifp;
153 struct ip *ip;
154 uint8_t ecn;
155
156 sc = encap_getarg(m);
157 if (sc == NULL) {
158 m_freem(m);
159 KMOD_IPSTAT_INC(ips_nogif);
160 return (IPPROTO_DONE);
161 }
162 gifp = GIF2IFP(sc);
163 if ((gifp->if_flags & IFF_UP) != 0) {
164 ip = mtod(m, struct ip *);
165 ecn = ip->ip_tos;
166 m_adj(m, *offp);
167 gif_input(m, gifp, proto, ecn);
168 } else {
169 m_freem(m);
170 KMOD_IPSTAT_INC(ips_nogif);
171 }
172 return (IPPROTO_DONE);
173 }
174
175 /*
176 * validate outer address.
177 */
178 static int
179 gif_validate4(const struct ip *ip, struct gif_softc *sc, struct ifnet *ifp)
180 {
181 int ret;
182
183 GIF_RLOCK_ASSERT(sc);
184
185 /* check for address match */
186 if (sc->gif_iphdr->ip_src.s_addr != ip->ip_dst.s_addr)
187 return (0);
188 ret = 32;
189 if (sc->gif_iphdr->ip_dst.s_addr != ip->ip_src.s_addr) {
190 if ((sc->gif_options & GIF_IGNORE_SOURCE) == 0)
191 return (0);
192 } else
193 ret += 32;
194
195 /* martian filters on outer source - NOT done in ip_input! */
196 if (IN_MULTICAST(ntohl(ip->ip_src.s_addr)))
197 return (0);
198 switch ((ntohl(ip->ip_src.s_addr) & 0xff000000) >> 24) {
199 case 0:
200 case 127:
201 case 255:
202 return (0);
203 }
204
205 /* ingress filters on outer source */
206 if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) {
207 struct sockaddr_in sin;
208 struct rtentry *rt;
209
210 bzero(&sin, sizeof(sin));
211 sin.sin_family = AF_INET;
212 sin.sin_len = sizeof(struct sockaddr_in);
213 sin.sin_addr = ip->ip_src;
214 /* XXX MRT check for the interface we would use on output */
215 rt = in_rtalloc1((struct sockaddr *)&sin, 0,
216 0UL, sc->gif_fibnum);
217 if (!rt || rt->rt_ifp != ifp) {
218 if (rt)
219 RTFREE_LOCKED(rt);
220 return (0);
221 }
222 RTFREE_LOCKED(rt);
223 }
224 return (ret);
225 }
226
227 /*
228 * we know that we are in IFF_UP, outer address available, and outer family
229 * matched the physical addr family. see gif_encapcheck().
230 */
231 int
232 in_gif_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
233 {
234 struct ip ip;
235 struct gif_softc *sc;
236 struct ifnet *ifp;
237
238 /* sanity check done in caller */
239 sc = (struct gif_softc *)arg;
240 GIF_RLOCK_ASSERT(sc);
241
242 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip);
243 ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
244 return (gif_validate4(&ip, sc, ifp));
245 }
246
247 int
248 in_gif_attach(struct gif_softc *sc)
249 {
250
251 KASSERT(sc->gif_ecookie == NULL, ("gif_ecookie isn't NULL"));
252 sc->gif_ecookie = encap_attach_func(AF_INET, -1, gif_encapcheck,
253 &in_gif_protosw, sc);
254 if (sc->gif_ecookie == NULL)
255 return (EEXIST);
256 return (0);
257 }
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