Merge from vendor branch OPENSSL:
[dragonfly.git] / sys / netinet / in_gif.c
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1/*
2 * $FreeBSD: src/sys/netinet/in_gif.c,v 1.5.2.11 2003/01/23 21:06:45 sam Exp $
1b562c24 3 * $DragonFly: src/sys/netinet/in_gif.c,v 1.17 2008/06/08 08:38:05 sephe Exp $
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4 * $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 itojun Exp $
5 */
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6/*
7 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the project nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include "opt_inet.h"
36#include "opt_inet6.h"
37
38#include <sys/param.h>
39#include <sys/systm.h>
40#include <sys/socket.h>
41#include <sys/sockio.h>
42#include <sys/mbuf.h>
43#include <sys/errno.h>
44#include <sys/kernel.h>
45#include <sys/sysctl.h>
46#include <sys/protosw.h>
47
48#include <sys/malloc.h>
49
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50#include <machine/stdarg.h>
51
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52#include <net/if.h>
53#include <net/route.h>
54
55#include <netinet/in.h>
56#include <netinet/in_systm.h>
57#include <netinet/ip.h>
58#include <netinet/ip_var.h>
59#include <netinet/in_gif.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
1f2de5d4 68#include <net/gif/if_gif.h>
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69#include <net/net_osdep.h>
70
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71#include <sys/thread2.h> /* ipstat */
72
4df648af 73#ifdef INET
42a7fc75 74static int gif_validate4 (const struct ip *, struct gif_softc *,
f23061d4 75 struct ifnet *);
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76
77extern struct domain inetdomain;
f23061d4 78const struct protosw in_gif_protosw =
984263bc 79{ SOCK_RAW, &inetdomain, 0/*IPPROTO_IPV[46]*/, PR_ATOMIC|PR_ADDR,
41c20dac 80 in_gif_input, rip_output, 0, rip_ctloutput,
9eeaa8a9 81 cpu0_soport,
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82 0, 0, 0, 0,
83 &rip_usrreqs
84};
85
86int ip_gif_ttl = GIF_TTL;
87SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
88 &ip_gif_ttl, 0, "");
89
90int
0c3c561c 91in_gif_output(struct ifnet *ifp, int family, struct mbuf *m)
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92{
93 struct gif_softc *sc = (struct gif_softc*)ifp;
94 struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst;
95 struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
96 struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
97 struct ip iphdr; /* capsule IP header, host byte ordered */
98 int proto, error;
99 u_int8_t tos;
100
101 if (sin_src == NULL || sin_dst == NULL ||
102 sin_src->sin_family != AF_INET ||
103 sin_dst->sin_family != AF_INET) {
104 m_freem(m);
105 return EAFNOSUPPORT;
106 }
107
108 switch (family) {
109#ifdef INET
110 case AF_INET:
111 {
112 struct ip *ip;
113
114 proto = IPPROTO_IPV4;
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115 if (m->m_len < sizeof *ip) {
116 m = m_pullup(m, sizeof *ip);
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117 if (!m)
118 return ENOBUFS;
119 }
120 ip = mtod(m, struct ip *);
121 tos = ip->ip_tos;
122 break;
123 }
be23faf1 124#endif
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125#ifdef INET6
126 case AF_INET6:
127 {
128 struct ip6_hdr *ip6;
129 proto = IPPROTO_IPV6;
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130 if (m->m_len < sizeof *ip6) {
131 m = m_pullup(m, sizeof *ip6);
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132 if (!m)
133 return ENOBUFS;
134 }
135 ip6 = mtod(m, struct ip6_hdr *);
136 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
137 break;
138 }
be23faf1 139#endif
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140 default:
141#ifdef DEBUG
a6ec04bc 142 kprintf("in_gif_output: warning: unknown family %d passed\n",
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143 family);
144#endif
145 m_freem(m);
146 return EAFNOSUPPORT;
147 }
148
0c3c561c 149 bzero(&iphdr, sizeof iphdr);
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150 iphdr.ip_src = sin_src->sin_addr;
151 /* bidirectional configured tunnel mode */
152 if (sin_dst->sin_addr.s_addr != INADDR_ANY)
153 iphdr.ip_dst = sin_dst->sin_addr;
154 else {
155 m_freem(m);
156 return ENETUNREACH;
157 }
158 iphdr.ip_p = proto;
159 /* version will be set in ip_output() */
160 iphdr.ip_ttl = ip_gif_ttl;
161 iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
162 if (ifp->if_flags & IFF_LINK1)
163 ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos);
164 else
165 ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos);
166
167 /* prepend new IP header */
74f1caca 168 M_PREPEND(m, sizeof(struct ip), MB_DONTWAIT);
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169 if (m && m->m_len < sizeof(struct ip))
170 m = m_pullup(m, sizeof(struct ip));
171 if (m == NULL) {
a6ec04bc 172 kprintf("ENOBUFS in in_gif_output %d\n", __LINE__);
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173 return ENOBUFS;
174 }
175 bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
176
177 if (dst->sin_family != sin_dst->sin_family ||
178 dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
179 /* cache route doesn't match */
180 dst->sin_family = sin_dst->sin_family;
181 dst->sin_len = sizeof(struct sockaddr_in);
182 dst->sin_addr = sin_dst->sin_addr;
be23faf1 183 if (sc->gif_ro.ro_rt != NULL) {
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184 RTFREE(sc->gif_ro.ro_rt);
185 sc->gif_ro.ro_rt = NULL;
186 }
187#if 0
188 sc->gif_if.if_mtu = GIF_MTU;
189#endif
190 }
191
192 if (sc->gif_ro.ro_rt == NULL) {
193 rtalloc(&sc->gif_ro);
194 if (sc->gif_ro.ro_rt == NULL) {
195 m_freem(m);
196 return ENETUNREACH;
197 }
198
199 /* if it constitutes infinite encapsulation, punt. */
200 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
201 m_freem(m);
202 return ENETUNREACH; /* XXX */
203 }
204#if 0
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205 ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu -
206 sizeof(struct ip);
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207#endif
208 }
209
210 error = ip_output(m, NULL, &sc->gif_ro, 0, NULL, NULL);
211 return(error);
212}
213
214void
a00138cb 215in_gif_input(struct mbuf *m, ...)
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216{
217 struct ifnet *gifp = NULL;
218 struct ip *ip;
219 int af;
220 u_int8_t otos;
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221 int off, proto;
222 __va_list ap;
223
224 __va_start(ap, m);
225 off = __va_arg(ap, int);
226 proto = __va_arg(ap, int);
227 __va_end(ap);
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228
229 ip = mtod(m, struct ip *);
230
231 gifp = (struct ifnet *)encap_getarg(m);
232
233 if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
234 m_freem(m);
235 ipstat.ips_nogif++;
236 return;
237 }
238
239 otos = ip->ip_tos;
240 m_adj(m, off);
241
242 switch (proto) {
243#ifdef INET
244 case IPPROTO_IPV4:
245 {
246 struct ip *ip;
247 af = AF_INET;
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248 if (m->m_len < sizeof *ip) {
249 m = m_pullup(m, sizeof *ip);
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250 if (!m)
251 return;
252 }
253 ip = mtod(m, struct ip *);
254 if (gifp->if_flags & IFF_LINK1)
255 ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos);
256 else
257 ip_ecn_egress(ECN_NOCARE, &otos, &ip->ip_tos);
258 break;
259 }
260#endif
261#ifdef INET6
262 case IPPROTO_IPV6:
263 {
264 struct ip6_hdr *ip6;
265 u_int8_t itos;
266 af = AF_INET6;
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267 if (m->m_len < sizeof *ip6) {
268 m = m_pullup(m, sizeof *ip6);
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269 if (!m)
270 return;
271 }
272 ip6 = mtod(m, struct ip6_hdr *);
273 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
274 if (gifp->if_flags & IFF_LINK1)
275 ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
276 else
277 ip_ecn_egress(ECN_NOCARE, &otos, &itos);
278 ip6->ip6_flow &= ~htonl(0xff << 20);
279 ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
280 break;
281 }
282#endif /* INET6 */
283 default:
284 ipstat.ips_nogif++;
285 m_freem(m);
286 return;
287 }
288 gif_input(m, af, gifp);
289 return;
290}
291
292/*
293 * validate outer address.
294 */
295static int
0c3c561c 296gif_validate4(const struct ip *ip, struct gif_softc *sc, struct ifnet *ifp)
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297{
298 struct sockaddr_in *src, *dst;
1b562c24 299 struct in_ifaddr_container *iac;
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300
301 src = (struct sockaddr_in *)sc->gif_psrc;
302 dst = (struct sockaddr_in *)sc->gif_pdst;
303
304 /* check for address match */
305 if (src->sin_addr.s_addr != ip->ip_dst.s_addr ||
306 dst->sin_addr.s_addr != ip->ip_src.s_addr)
307 return 0;
308
309 /* martian filters on outer source - NOT done in ip_input! */
310 if (IN_MULTICAST(ntohl(ip->ip_src.s_addr)))
311 return 0;
312 switch ((ntohl(ip->ip_src.s_addr) & 0xff000000) >> 24) {
313 case 0: case 127: case 255:
314 return 0;
315 }
316 /* reject packets with broadcast on source */
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317 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
318 struct in_ifaddr *ia4 = iac->ia;
319
be23faf1 320 if (!(ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST))
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321 continue;
322 if (ip->ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr)
323 return 0;
324 }
325
326 /* ingress filters on outer source */
be23faf1 327 if (!(sc->gif_if.if_flags & IFF_LINK2) && ifp != NULL) {
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328 struct sockaddr_in sin;
329 struct rtentry *rt;
330
0c3c561c 331 bzero(&sin, sizeof sin);
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332 sin.sin_family = AF_INET;
333 sin.sin_len = sizeof(struct sockaddr_in);
334 sin.sin_addr = ip->ip_src;
f3ed2586 335 rt = rtpurelookup((struct sockaddr *)&sin);
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336 if (rt != NULL)
337 --rt->rt_refcnt;
338 if (rt == NULL || rt->rt_ifp != ifp) {
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339#if 0
340 log(LOG_WARNING, "%s: packet from 0x%x dropped "
341 "due to ingress filter\n", if_name(&sc->gif_if),
342 (u_int32_t)ntohl(sin.sin_addr.s_addr));
343#endif
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344 return 0;
345 }
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346 }
347
348 return 32 * 2;
349}
350
351/*
352 * we know that we are in IFF_UP, outer address available, and outer family
353 * matched the physical addr family. see gif_encapcheck().
354 */
355int
0c3c561c 356gif_encapcheck4(const struct mbuf *m, int off, int proto, void *arg)
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357{
358 struct ip ip;
359 struct gif_softc *sc;
360 struct ifnet *ifp;
361
362 /* sanity check done in caller */
363 sc = (struct gif_softc *)arg;
364
365 /* LINTED const cast */
0c3c561c 366 m_copydata(__DECONST(struct mbuf *, m), 0, sizeof ip, (caddr_t)&ip);
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367 ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
368
369 return gif_validate4(&ip, sc, ifp);
370}
371
372int
0c3c561c 373in_gif_attach(struct gif_softc *sc)
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374{
375 sc->encap_cookie4 = encap_attach_func(AF_INET, -1, gif_encapcheck,
376 &in_gif_protosw, sc);
377 if (sc->encap_cookie4 == NULL)
378 return EEXIST;
379 return 0;
380}
381
382int
0c3c561c 383in_gif_detach(struct gif_softc *sc)
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384{
385 int error;
386
387 error = encap_detach(sc->encap_cookie4);
388 if (error == 0)
389 sc->encap_cookie4 = NULL;
390 return error;
391}
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392
393#endif /* INET */