Change mbug allocation flags from M_ to MB_ to avoid confusion with malloc
[dragonfly.git] / sys / netinet6 / in6_gif.c
CommitLineData
984263bc 1/* $FreeBSD: src/sys/netinet6/in6_gif.c,v 1.2.2.7 2003/01/23 21:06:47 sam Exp $ */
74f1caca 2/* $DragonFly: src/sys/netinet6/in6_gif.c,v 1.7 2004/06/02 14:43:01 eirikn Exp $ */
984263bc
MD
3/* $KAME: in6_gif.c,v 1.49 2001/05/14 14:02:17 itojun Exp $ */
4
5/*
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "opt_inet.h"
35#include "opt_inet6.h"
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/socket.h>
40#include <sys/sockio.h>
41#include <sys/mbuf.h>
42#include <sys/errno.h>
43#include <sys/queue.h>
44#include <sys/syslog.h>
45#include <sys/protosw.h>
46
47#include <sys/malloc.h>
48
49#include <net/if.h>
50#include <net/route.h>
51
52#include <netinet/in.h>
53#include <netinet/in_systm.h>
54#ifdef INET
55#include <netinet/ip.h>
56#endif
57#include <netinet/ip_encap.h>
58#ifdef INET6
59#include <netinet/ip6.h>
60#include <netinet6/ip6_var.h>
61#include <netinet6/in6_gif.h>
62#include <netinet6/in6_var.h>
63#endif
64#include <netinet6/ip6protosw.h>
65#include <netinet/ip_ecn.h>
66#ifdef INET6
67#include <netinet6/ip6_ecn.h>
68#endif
69
1f2de5d4 70#include <net/gif/if_gif.h>
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71
72#include <net/net_osdep.h>
73
74static int gif_validate6(const struct ip6_hdr *, struct gif_softc *,
75 struct ifnet *);
76
77extern struct domain6 inet6domain;
78struct ip6protosw in6_gif_protosw =
79{ SOCK_RAW, &inet6domain, 0/*IPPROTO_IPV[46]*/, PR_ATOMIC|PR_ADDR,
80 in6_gif_input, rip6_output, 0, rip6_ctloutput,
9eeaa8a9 81 cpu0_soport,
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82 0, 0, 0, 0,
83 &rip6_usrreqs
84};
85
86int
122ebd49
CP
87in6_gif_output(struct ifnet *ifp,
88 int family, /* family of the packet to be encapsulate. */
89 struct mbuf *m)
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90{
91 struct gif_softc *sc = (struct gif_softc*)ifp;
92 struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst;
93 struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc;
94 struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst;
95 struct ip6_hdr *ip6;
96 int proto;
97 u_int8_t itos, otos;
98
99 if (sin6_src == NULL || sin6_dst == NULL ||
100 sin6_src->sin6_family != AF_INET6 ||
101 sin6_dst->sin6_family != AF_INET6) {
102 m_freem(m);
103 return EAFNOSUPPORT;
104 }
105
106 switch (family) {
107#ifdef INET
108 case AF_INET:
109 {
110 struct ip *ip;
111
112 proto = IPPROTO_IPV4;
113 if (m->m_len < sizeof(*ip)) {
114 m = m_pullup(m, sizeof(*ip));
115 if (!m)
116 return ENOBUFS;
117 }
118 ip = mtod(m, struct ip *);
119 itos = ip->ip_tos;
120 break;
121 }
122#endif
123#ifdef INET6
124 case AF_INET6:
125 {
126 struct ip6_hdr *ip6;
127 proto = IPPROTO_IPV6;
128 if (m->m_len < sizeof(*ip6)) {
129 m = m_pullup(m, sizeof(*ip6));
130 if (!m)
131 return ENOBUFS;
132 }
133 ip6 = mtod(m, struct ip6_hdr *);
134 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
135 break;
136 }
137#endif
138 default:
139#ifdef DEBUG
140 printf("in6_gif_output: warning: unknown family %d passed\n",
141 family);
142#endif
143 m_freem(m);
144 return EAFNOSUPPORT;
145 }
146
147 /* prepend new IP header */
74f1caca 148 M_PREPEND(m, sizeof(struct ip6_hdr), MB_DONTWAIT);
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149 if (m && m->m_len < sizeof(struct ip6_hdr))
150 m = m_pullup(m, sizeof(struct ip6_hdr));
151 if (m == NULL) {
152 printf("ENOBUFS in in6_gif_output %d\n", __LINE__);
153 return ENOBUFS;
154 }
155
156 ip6 = mtod(m, struct ip6_hdr *);
157 ip6->ip6_flow = 0;
158 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
159 ip6->ip6_vfc |= IPV6_VERSION;
160 ip6->ip6_plen = htons((u_short)m->m_pkthdr.len);
161 ip6->ip6_nxt = proto;
162 ip6->ip6_hlim = ip6_gif_hlim;
163 ip6->ip6_src = sin6_src->sin6_addr;
164 /* bidirectional configured tunnel mode */
165 if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr))
166 ip6->ip6_dst = sin6_dst->sin6_addr;
167 else {
168 m_freem(m);
169 return ENETUNREACH;
170 }
171 if (ifp->if_flags & IFF_LINK1)
172 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
173 else
174 ip_ecn_ingress(ECN_NOCARE, &otos, &itos);
175 ip6->ip6_flow &= ~ntohl(0xff00000);
176 ip6->ip6_flow |= htonl((u_int32_t)otos << 20);
177
178 if (dst->sin6_family != sin6_dst->sin6_family ||
179 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) {
180 /* cache route doesn't match */
181 bzero(dst, sizeof(*dst));
182 dst->sin6_family = sin6_dst->sin6_family;
183 dst->sin6_len = sizeof(struct sockaddr_in6);
184 dst->sin6_addr = sin6_dst->sin6_addr;
185 if (sc->gif_ro6.ro_rt) {
186 RTFREE(sc->gif_ro6.ro_rt);
187 sc->gif_ro6.ro_rt = NULL;
188 }
189#if 0
190 sc->gif_if.if_mtu = GIF_MTU;
191#endif
192 }
193
194 if (sc->gif_ro6.ro_rt == NULL) {
195 rtalloc((struct route *)&sc->gif_ro6);
196 if (sc->gif_ro6.ro_rt == NULL) {
197 m_freem(m);
198 return ENETUNREACH;
199 }
200
201 /* if it constitutes infinite encapsulation, punt. */
202 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
203 m_freem(m);
204 return ENETUNREACH; /*XXX*/
205 }
206#if 0
207 ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu
208 - sizeof(struct ip6_hdr);
209#endif
210 }
211
212#ifdef IPV6_MINMTU
213 /*
214 * force fragmentation to minimum MTU, to avoid path MTU discovery.
215 * it is too painful to ask for resend of inner packet, to achieve
216 * path MTU discovery for encapsulated packets.
217 */
218 return(ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL));
219#else
220 return(ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL));
221#endif
222}
223
122ebd49 224int in6_gif_input(struct mbuf **mp, int *offp, int proto)
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MD
225{
226 struct mbuf *m = *mp;
227 struct ifnet *gifp = NULL;
228 struct ip6_hdr *ip6;
229 int af = 0;
230 u_int32_t otos;
231
232 ip6 = mtod(m, struct ip6_hdr *);
233
234 gifp = (struct ifnet *)encap_getarg(m);
235
236 if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
237 m_freem(m);
238 ip6stat.ip6s_nogif++;
239 return IPPROTO_DONE;
240 }
241
242 otos = ip6->ip6_flow;
243 m_adj(m, *offp);
244
245 switch (proto) {
246#ifdef INET
247 case IPPROTO_IPV4:
248 {
249 struct ip *ip;
250 u_int8_t otos8;
251 af = AF_INET;
252 otos8 = (ntohl(otos) >> 20) & 0xff;
253 if (m->m_len < sizeof(*ip)) {
254 m = m_pullup(m, sizeof(*ip));
255 if (!m)
256 return IPPROTO_DONE;
257 }
258 ip = mtod(m, struct ip *);
259 if (gifp->if_flags & IFF_LINK1)
260 ip_ecn_egress(ECN_ALLOWED, &otos8, &ip->ip_tos);
261 else
262 ip_ecn_egress(ECN_NOCARE, &otos8, &ip->ip_tos);
263 break;
264 }
265#endif /* INET */
266#ifdef INET6
267 case IPPROTO_IPV6:
268 {
269 struct ip6_hdr *ip6;
270 af = AF_INET6;
271 if (m->m_len < sizeof(*ip6)) {
272 m = m_pullup(m, sizeof(*ip6));
273 if (!m)
274 return IPPROTO_DONE;
275 }
276 ip6 = mtod(m, struct ip6_hdr *);
277 if (gifp->if_flags & IFF_LINK1)
278 ip6_ecn_egress(ECN_ALLOWED, &otos, &ip6->ip6_flow);
279 else
280 ip6_ecn_egress(ECN_NOCARE, &otos, &ip6->ip6_flow);
281 break;
282 }
283#endif
284 default:
285 ip6stat.ip6s_nogif++;
286 m_freem(m);
287 return IPPROTO_DONE;
288 }
289
290 gif_input(m, af, gifp);
291 return IPPROTO_DONE;
292}
293
294/*
295 * validate outer address.
296 */
297static int
122ebd49
CP
298gif_validate6(const struct ip6_hdr *ip6, struct gif_softc *sc,
299 struct ifnet *ifp)
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300{
301 struct sockaddr_in6 *src, *dst;
302
303 src = (struct sockaddr_in6 *)sc->gif_psrc;
304 dst = (struct sockaddr_in6 *)sc->gif_pdst;
305
306 /*
307 * Check for address match. Note that the check is for an incoming
308 * packet. We should compare the *source* address in our configuration
309 * and the *destination* address of the packet, and vice versa.
310 */
311 if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) ||
312 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src))
313 return 0;
314
315 /* martian filters on outer source - done in ip6_input */
316
317 /* ingress filters on outer source */
318 if ((sc->gif_if.if_flags & IFF_LINK2) == 0 && ifp) {
319 struct sockaddr_in6 sin6;
320 struct rtentry *rt;
321
322 bzero(&sin6, sizeof(sin6));
323 sin6.sin6_family = AF_INET6;
324 sin6.sin6_len = sizeof(struct sockaddr_in6);
325 sin6.sin6_addr = ip6->ip6_src;
326#ifndef SCOPEDROUTING
327 sin6.sin6_scope_id = 0; /* XXX */
328#endif
329
330 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
331 if (!rt || rt->rt_ifp != ifp) {
332#if 0
333 log(LOG_WARNING, "%s: packet from %s dropped "
334 "due to ingress filter\n", if_name(&sc->gif_if),
335 ip6_sprintf(&sin6.sin6_addr));
336#endif
337 if (rt)
338 rtfree(rt);
339 return 0;
340 }
341 rtfree(rt);
342 }
343
344 return 128 * 2;
345}
346
347/*
348 * we know that we are in IFF_UP, outer address available, and outer family
349 * matched the physical addr family. see gif_encapcheck().
350 * sanity check for arg should have been done in the caller.
351 */
352int
122ebd49 353gif_encapcheck6(const struct mbuf *m, int off, int proto, void *arg)
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MD
354{
355 struct ip6_hdr ip6;
356 struct gif_softc *sc;
357 struct ifnet *ifp;
358
359 /* sanity check done in caller */
360 sc = (struct gif_softc *)arg;
361
f15db79e 362 m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6);
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MD
363 ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
364
365 return gif_validate6(&ip6, sc, ifp);
366}
367
368int
122ebd49 369in6_gif_attach(struct gif_softc *sc)
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MD
370{
371 sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck,
372 (struct protosw *)&in6_gif_protosw, sc);
373 if (sc->encap_cookie6 == NULL)
374 return EEXIST;
375 return 0;
376}
377
378int
122ebd49 379in6_gif_detach(struct gif_softc *sc)
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MD
380{
381 int error;
382
383 error = encap_detach(sc->encap_cookie6);
384 if (error == 0)
385 sc->encap_cookie6 = NULL;
386 return error;
387}