1 /* $NetBSD: in6_gif.c,v 1.45 2006/06/07 22:34:03 kardel Exp $ */
2 /* $KAME: in6_gif.c,v 1.62 2001/07/29 04:27:25 itojun Exp $ */
3
4 /*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include <sys/cdefs.h>
34 __KERNEL_RCSID(0, "$NetBSD: in6_gif.c,v 1.45 2006/06/07 22:34:03 kardel Exp $");
35
36 #include "opt_inet.h"
37 #include "opt_iso.h"
38
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/socket.h>
42 #include <sys/sockio.h>
43 #include <sys/mbuf.h>
44 #include <sys/errno.h>
45 #include <sys/ioctl.h>
46 #include <sys/queue.h>
47 #include <sys/syslog.h>
48 #include <sys/protosw.h>
49 #include <sys/kernel.h>
50
51 #include <net/if.h>
52 #include <net/route.h>
53
54 #include <netinet/in.h>
55 #include <netinet/in_systm.h>
56 #ifdef INET
57 #include <netinet/ip.h>
58 #endif
59 #include <netinet/ip_encap.h>
60 #ifdef INET6
61 #include <netinet/ip6.h>
62 #include <netinet6/ip6_var.h>
63 #include <netinet6/in6_gif.h>
64 #include <netinet6/in6_var.h>
65 #endif
66 #include <netinet6/ip6protosw.h>
67 #include <netinet/ip_ecn.h>
68
69 #include <net/if_gif.h>
70
71 #include <net/net_osdep.h>
72
73 static int gif_validate6 __P((const struct ip6_hdr *, struct gif_softc *,
74 struct ifnet *));
75
76 int ip6_gif_hlim = GIF_HLIM;
77
78 extern struct domain inet6domain;
79 const struct ip6protosw in6_gif_protosw =
80 { SOCK_RAW, &inet6domain, 0/* IPPROTO_IPV[46] */, PR_ATOMIC|PR_ADDR,
81 in6_gif_input, rip6_output, in6_gif_ctlinput, rip6_ctloutput,
82 rip6_usrreq,
83 0, 0, 0, 0,
84 };
85
86 extern LIST_HEAD(, gif_softc) gif_softc_list;
87
88 int
89 in6_gif_output(ifp, family, m)
90 struct ifnet *ifp;
91 int family; /* family of the packet to be encapsulate. */
92 struct mbuf *m;
93 {
94 struct gif_softc *sc = (struct gif_softc*)ifp;
95 struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst;
96 struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc;
97 struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst;
98 struct ip6_hdr *ip6;
99 int proto, error;
100 u_int8_t itos, otos;
101
102 if (sin6_src == NULL || sin6_dst == NULL ||
103 sin6_src->sin6_family != AF_INET6 ||
104 sin6_dst->sin6_family != AF_INET6) {
105 m_freem(m);
106 return EAFNOSUPPORT;
107 }
108
109 switch (family) {
110 #ifdef INET
111 case AF_INET:
112 {
113 struct ip *ip;
114
115 proto = IPPROTO_IPV4;
116 if (m->m_len < sizeof(*ip)) {
117 m = m_pullup(m, sizeof(*ip));
118 if (!m)
119 return ENOBUFS;
120 }
121 ip = mtod(m, struct ip *);
122 itos = ip->ip_tos;
123 break;
124 }
125 #endif
126 #ifdef INET6
127 case AF_INET6:
128 {
129 proto = IPPROTO_IPV6;
130 if (m->m_len < sizeof(*ip6)) {
131 m = m_pullup(m, sizeof(*ip6));
132 if (!m)
133 return ENOBUFS;
134 }
135 ip6 = mtod(m, struct ip6_hdr *);
136 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
137 break;
138 }
139 #endif
140 #ifdef ISO
141 case AF_ISO:
142 proto = IPPROTO_EON;
143 itos = 0;
144 break;
145 #endif
146 default:
147 #ifdef DEBUG
148 printf("in6_gif_output: warning: unknown family %d passed\n",
149 family);
150 #endif
151 m_freem(m);
152 return EAFNOSUPPORT;
153 }
154
155 /* prepend new IP header */
156 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT);
157 if (m && m->m_len < sizeof(struct ip6_hdr))
158 m = m_pullup(m, sizeof(struct ip6_hdr));
159 if (m == NULL)
160 return ENOBUFS;
161
162 ip6 = mtod(m, struct ip6_hdr *);
163 ip6->ip6_flow = 0;
164 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
165 ip6->ip6_vfc |= IPV6_VERSION;
166 #if 0 /* ip6->ip6_plen will be filled by ip6_output */
167 ip6->ip6_plen = htons((u_int16_t)m->m_pkthdr.len);
168 #endif
169 ip6->ip6_nxt = proto;
170 ip6->ip6_hlim = ip6_gif_hlim;
171 ip6->ip6_src = sin6_src->sin6_addr;
172 /* bidirectional configured tunnel mode */
173 if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr))
174 ip6->ip6_dst = sin6_dst->sin6_addr;
175 else {
176 m_freem(m);
177 return ENETUNREACH;
178 }
179 if (ifp->if_flags & IFF_LINK1)
180 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
181 else
182 ip_ecn_ingress(ECN_NOCARE, &otos, &itos);
183 ip6->ip6_flow &= ~ntohl(0xff00000);
184 ip6->ip6_flow |= htonl((u_int32_t)otos << 20);
185
186 if (sc->gif_route_expire - time_second <= 0 ||
187 dst->sin6_family != sin6_dst->sin6_family ||
188 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) {
189 /* cache route doesn't match */
190 bzero(dst, sizeof(*dst));
191 dst->sin6_family = sin6_dst->sin6_family;
192 dst->sin6_len = sizeof(struct sockaddr_in6);
193 dst->sin6_addr = sin6_dst->sin6_addr;
194 if (sc->gif_ro6.ro_rt) {
195 RTFREE(sc->gif_ro6.ro_rt);
196 sc->gif_ro6.ro_rt = NULL;
197 }
198 }
199
200 if (sc->gif_ro6.ro_rt == NULL) {
201 rtalloc((struct route *)&sc->gif_ro6);
202 if (sc->gif_ro6.ro_rt == NULL) {
203 m_freem(m);
204 return ENETUNREACH;
205 }
206
207 /* if it constitutes infinite encapsulation, punt. */
208 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
209 m_freem(m);
210 return ENETUNREACH; /* XXX */
211 }
212
213 sc->gif_route_expire = time_second + GIF_ROUTE_TTL;
214 }
215
216 #ifdef IPV6_MINMTU
217 /*
218 * force fragmentation to minimum MTU, to avoid path MTU discovery.
219 * it is too painful to ask for resend of inner packet, to achieve
220 * path MTU discovery for encapsulated packets.
221 */
222 error = ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU,
223 (struct ip6_moptions *)NULL, (struct socket *)NULL, NULL);
224 #else
225 error = ip6_output(m, 0, &sc->gif_ro6, 0,
226 (struct ip6_moptions *)NULL, (struct socket *)NULL, NULL);
227 #endif
228
229 return (error);
230 }
231
232 int in6_gif_input(mp, offp, proto)
233 struct mbuf **mp;
234 int *offp, proto;
235 {
236 struct mbuf *m = *mp;
237 struct ifnet *gifp = NULL;
238 struct ip6_hdr *ip6;
239 int af = 0;
240 u_int32_t otos;
241
242 ip6 = mtod(m, struct ip6_hdr *);
243
244 gifp = (struct ifnet *)encap_getarg(m);
245
246 if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
247 m_freem(m);
248 ip6stat.ip6s_nogif++;
249 return IPPROTO_DONE;
250 }
251 #ifndef GIF_ENCAPCHECK
252 if (!gif_validate6(ip6, (struct gif_softc *)gifp, m->m_pkthdr.rcvif)) {
253 m_freem(m);
254 ip6stat.ip6s_nogif++;
255 return IPPROTO_DONE;
256 }
257 #endif
258
259 otos = ip6->ip6_flow;
260 m_adj(m, *offp);
261
262 switch (proto) {
263 #ifdef INET
264 case IPPROTO_IPV4:
265 {
266 struct ip *ip;
267 u_int8_t otos8;
268 af = AF_INET;
269 otos8 = (ntohl(otos) >> 20) & 0xff;
270 if (m->m_len < sizeof(*ip)) {
271 m = m_pullup(m, sizeof(*ip));
272 if (!m)
273 return IPPROTO_DONE;
274 }
275 ip = mtod(m, struct ip *);
276 if (gifp->if_flags & IFF_LINK1)
277 ip_ecn_egress(ECN_ALLOWED, &otos8, &ip->ip_tos);
278 else
279 ip_ecn_egress(ECN_NOCARE, &otos8, &ip->ip_tos);
280 break;
281 }
282 #endif /* INET */
283 #ifdef INET6
284 case IPPROTO_IPV6:
285 {
286 struct ip6_hdr *ip6x;
287 af = AF_INET6;
288 if (m->m_len < sizeof(*ip6x)) {
289 m = m_pullup(m, sizeof(*ip6x));
290 if (!m)
291 return IPPROTO_DONE;
292 }
293 ip6x = mtod(m, struct ip6_hdr *);
294 if (gifp->if_flags & IFF_LINK1)
295 ip6_ecn_egress(ECN_ALLOWED, &otos, &ip6x->ip6_flow);
296 else
297 ip6_ecn_egress(ECN_NOCARE, &otos, &ip6x->ip6_flow);
298 break;
299 }
300 #endif
301 #ifdef ISO
302 case IPPROTO_EON:
303 af = AF_ISO;
304 break;
305 #endif
306 default:
307 ip6stat.ip6s_nogif++;
308 m_freem(m);
309 return IPPROTO_DONE;
310 }
311
312 gif_input(m, af, gifp);
313 return IPPROTO_DONE;
314 }
315
316 /*
317 * validate outer address.
318 */
319 static int
320 gif_validate6(ip6, sc, ifp)
321 const struct ip6_hdr *ip6;
322 struct gif_softc *sc;
323 struct ifnet *ifp;
324 {
325 struct sockaddr_in6 *src, *dst;
326
327 src = (struct sockaddr_in6 *)sc->gif_psrc;
328 dst = (struct sockaddr_in6 *)sc->gif_pdst;
329
330 /* check for address match */
331 if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) ||
332 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src))
333 return 0;
334
335 /* martian filters on outer source - done in ip6_input */
336
337 /* ingress filters on outer source */
338 if ((sc->gif_if.if_flags & IFF_LINK2) == 0 && ifp) {
339 struct sockaddr_in6 sin6;
340 struct rtentry *rt;
341
342 bzero(&sin6, sizeof(sin6));
343 sin6.sin6_family = AF_INET6;
344 sin6.sin6_len = sizeof(struct sockaddr_in6);
345 sin6.sin6_addr = ip6->ip6_src;
346 /* XXX scopeid */
347 rt = rtalloc1((struct sockaddr *)&sin6, 0);
348 if (!rt || rt->rt_ifp != ifp) {
349 #if 0
350 log(LOG_WARNING, "%s: packet from %s dropped "
351 "due to ingress filter\n", if_name(&sc->gif_if),
352 ip6_sprintf(&sin6.sin6_addr));
353 #endif
354 if (rt)
355 rtfree(rt);
356 return 0;
357 }
358 rtfree(rt);
359 }
360
361 return 128 * 2;
362 }
363
364 #ifdef GIF_ENCAPCHECK
365 /*
366 * we know that we are in IFF_UP, outer address available, and outer family
367 * matched the physical addr family. see gif_encapcheck().
368 */
369 int
370 gif_encapcheck6(m, off, proto, arg)
371 struct mbuf *m;
372 int off;
373 int proto;
374 void *arg;
375 {
376 struct ip6_hdr ip6;
377 struct gif_softc *sc;
378 struct ifnet *ifp;
379
380 /* sanity check done in caller */
381 sc = (struct gif_softc *)arg;
382
383 m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6);
384 ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
385
386 return gif_validate6(&ip6, sc, ifp);
387 }
388 #endif
389
390 int
391 in6_gif_attach(sc)
392 struct gif_softc *sc;
393 {
394 #ifndef GIF_ENCAPCHECK
395 struct sockaddr_in6 mask6;
396
397 bzero(&mask6, sizeof(mask6));
398 mask6.sin6_len = sizeof(struct sockaddr_in6);
399 mask6.sin6_addr.s6_addr32[0] = mask6.sin6_addr.s6_addr32[1] =
400 mask6.sin6_addr.s6_addr32[2] = mask6.sin6_addr.s6_addr32[3] = ~0;
401
402 if (!sc->gif_psrc || !sc->gif_pdst)
403 return EINVAL;
404 sc->encap_cookie6 = encap_attach(AF_INET6, -1, sc->gif_psrc,
405 (struct sockaddr *)&mask6, sc->gif_pdst, (struct sockaddr *)&mask6,
406 (const void *)&in6_gif_protosw, sc);
407 #else
408 sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck,
409 (struct protosw *)&in6_gif_protosw, sc);
410 #endif
411 if (sc->encap_cookie6 == NULL)
412 return EEXIST;
413 return 0;
414 }
415
416 int
417 in6_gif_detach(sc)
418 struct gif_softc *sc;
419 {
420 int error;
421
422 error = encap_detach(sc->encap_cookie6);
423 if (error == 0)
424 sc->encap_cookie6 = NULL;
425
426 if (sc->gif_ro6.ro_rt) {
427 RTFREE(sc->gif_ro6.ro_rt);
428 sc->gif_ro6.ro_rt = NULL;
429 }
430
431 return error;
432 }
433
434 void
435 in6_gif_ctlinput(cmd, sa, d)
436 int cmd;
437 struct sockaddr *sa;
438 void *d;
439 {
440 struct gif_softc *sc;
441 struct ip6ctlparam *ip6cp = NULL;
442 struct ip6_hdr *ip6;
443 struct sockaddr_in6 *dst6;
444
445 if (sa->sa_family != AF_INET6 ||
446 sa->sa_len != sizeof(struct sockaddr_in6))
447 return;
448
449 if ((unsigned)cmd >= PRC_NCMDS)
450 return;
451 if (cmd == PRC_HOSTDEAD)
452 d = NULL;
453 else if (inet6ctlerrmap[cmd] == 0)
454 return;
455
456 /* if the parameter is from icmp6, decode it. */
457 if (d != NULL) {
458 ip6cp = (struct ip6ctlparam *)d;
459 ip6 = ip6cp->ip6c_ip6;
460 } else {
461 ip6 = NULL;
462 }
463
464 if (!ip6)
465 return;
466
467 /*
468 * for now we don't care which type it was, just flush the route cache.
469 * XXX slow. sc (or sc->encap_cookie6) should be passed from
470 * ip_encap.c.
471 */
472 for (sc = LIST_FIRST(&gif_softc_list); sc;
473 sc = LIST_NEXT(sc, gif_list)) {
474 if ((sc->gif_if.if_flags & IFF_RUNNING) == 0)
475 continue;
476 if (sc->gif_psrc->sa_family != AF_INET6)
477 continue;
478 if (!sc->gif_ro6.ro_rt)
479 continue;
480
481 dst6 = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst;
482 /* XXX scope */
483 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &dst6->sin6_addr)) {
484 /* flush route cache */
485 RTFREE(sc->gif_ro6.ro_rt);
486 sc->gif_ro6.ro_rt = NULL;
487 }
488 }
489 }
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