Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/in6_gif.c
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1 /* $FreeBSD: releng/6.0/sys/netinet6/in6_gif.c 147507 2005-06-20 20:17:00Z ume $ */ 2 /* $KAME: in6_gif.c,v 1.49 2001/05/14 14:02:17 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 "opt_inet.h" 34 #include "opt_inet6.h" 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/socket.h> 39 #include <sys/sockio.h> 40 #include <sys/mbuf.h> 41 #include <sys/errno.h> 42 #include <sys/queue.h> 43 #include <sys/syslog.h> 44 #include <sys/protosw.h> 45 46 #include <sys/malloc.h> 47 48 #include <net/if.h> 49 #include <net/route.h> 50 51 #include <netinet/in.h> 52 #include <netinet/in_systm.h> 53 #ifdef INET 54 #include <netinet/ip.h> 55 #endif 56 #include <netinet/ip_encap.h> 57 #ifdef INET6 58 #include <netinet/ip6.h> 59 #include <netinet6/ip6_var.h> 60 #include <netinet6/in6_gif.h> 61 #include <netinet6/in6_var.h> 62 #endif 63 #include <netinet6/ip6protosw.h> 64 #include <netinet/ip_ecn.h> 65 #ifdef INET6 66 #include <netinet6/ip6_ecn.h> 67 #endif 68 69 #include <net/if_gif.h> 70 71 #include <net/net_osdep.h> 72 73 static int gif_validate6(const struct ip6_hdr *, struct gif_softc *, 74 struct ifnet *); 75 76 extern struct domain inet6domain; 77 struct ip6protosw in6_gif_protosw = 78 { SOCK_RAW, &inet6domain, 0/* IPPROTO_IPV[46] */, PR_ATOMIC|PR_ADDR, 79 in6_gif_input, rip6_output, 0, rip6_ctloutput, 80 0, 81 0, 0, 0, 0, 82 &rip6_usrreqs 83 }; 84 85 int 86 in6_gif_output(ifp, family, m) 87 struct ifnet *ifp; 88 int family; /* family of the packet to be encapsulate. */ 89 struct mbuf *m; 90 { 91 struct gif_softc *sc = ifp->if_softc; 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, error; 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 */ 148 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT); 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 ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE, 172 &otos, &itos); 173 ip6->ip6_flow &= ~htonl(0xff << 20); 174 ip6->ip6_flow |= htonl((u_int32_t)otos << 20); 175 176 if (dst->sin6_family != sin6_dst->sin6_family || 177 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) { 178 /* cache route doesn't match */ 179 bzero(dst, sizeof(*dst)); 180 dst->sin6_family = sin6_dst->sin6_family; 181 dst->sin6_len = sizeof(struct sockaddr_in6); 182 dst->sin6_addr = sin6_dst->sin6_addr; 183 if (sc->gif_ro6.ro_rt) { 184 RTFREE(sc->gif_ro6.ro_rt); 185 sc->gif_ro6.ro_rt = NULL; 186 } 187 #if 0 188 GIF2IFP(sc)->if_mtu = GIF_MTU; 189 #endif 190 } 191 192 if (sc->gif_ro6.ro_rt == NULL) { 193 rtalloc((struct route *)&sc->gif_ro6); 194 if (sc->gif_ro6.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 0 205 ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu 206 - sizeof(struct ip6_hdr); 207 #endif 208 } 209 210 #ifdef IPV6_MINMTU 211 /* 212 * force fragmentation to minimum MTU, to avoid path MTU discovery. 213 * it is too painful to ask for resend of inner packet, to achieve 214 * path MTU discovery for encapsulated packets. 215 */ 216 error = ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL); 217 #else 218 error = ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL); 219 #endif 220 221 if (!(GIF2IFP(sc)->if_flags & IFF_LINK0) && 222 sc->gif_ro6.ro_rt != NULL) { 223 RTFREE(sc->gif_ro6.ro_rt); 224 sc->gif_ro6.ro_rt = NULL; 225 } 226 227 return (error); 228 } 229 230 int 231 in6_gif_input(mp, offp, proto) 232 struct mbuf **mp; 233 int *offp, proto; 234 { 235 struct mbuf *m = *mp; 236 struct ifnet *gifp = NULL; 237 struct gif_softc *sc; 238 struct ip6_hdr *ip6; 239 int af = 0; 240 u_int32_t otos; 241 242 ip6 = mtod(m, struct ip6_hdr *); 243 244 sc = (struct gif_softc *)encap_getarg(m); 245 if (sc == NULL) { 246 m_freem(m); 247 ip6stat.ip6s_nogif++; 248 return IPPROTO_DONE; 249 } 250 251 gifp = GIF2IFP(sc); 252 if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) { 253 m_freem(m); 254 ip6stat.ip6s_nogif++; 255 return IPPROTO_DONE; 256 } 257 258 otos = ip6->ip6_flow; 259 m_adj(m, *offp); 260 261 switch (proto) { 262 #ifdef INET 263 case IPPROTO_IPV4: 264 { 265 struct ip *ip; 266 u_int8_t otos8; 267 af = AF_INET; 268 otos8 = (ntohl(otos) >> 20) & 0xff; 269 if (m->m_len < sizeof(*ip)) { 270 m = m_pullup(m, sizeof(*ip)); 271 if (!m) 272 return IPPROTO_DONE; 273 } 274 ip = mtod(m, struct ip *); 275 if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ? 276 ECN_ALLOWED : ECN_NOCARE, 277 &otos8, &ip->ip_tos) == 0) { 278 m_freem(m); 279 return IPPROTO_DONE; 280 } 281 break; 282 } 283 #endif /* INET */ 284 #ifdef INET6 285 case IPPROTO_IPV6: 286 { 287 struct ip6_hdr *ip6; 288 af = AF_INET6; 289 if (m->m_len < sizeof(*ip6)) { 290 m = m_pullup(m, sizeof(*ip6)); 291 if (!m) 292 return IPPROTO_DONE; 293 } 294 ip6 = mtod(m, struct ip6_hdr *); 295 if (ip6_ecn_egress((gifp->if_flags & IFF_LINK1) ? 296 ECN_ALLOWED : ECN_NOCARE, 297 &otos, &ip6->ip6_flow) == 0) { 298 m_freem(m); 299 return IPPROTO_DONE; 300 } 301 break; 302 } 303 #endif 304 default: 305 ip6stat.ip6s_nogif++; 306 m_freem(m); 307 return IPPROTO_DONE; 308 } 309 310 gif_input(m, af, gifp); 311 return IPPROTO_DONE; 312 } 313 314 /* 315 * validate outer address. 316 */ 317 static int 318 gif_validate6(ip6, sc, ifp) 319 const struct ip6_hdr *ip6; 320 struct gif_softc *sc; 321 struct ifnet *ifp; 322 { 323 struct sockaddr_in6 *src, *dst; 324 325 src = (struct sockaddr_in6 *)sc->gif_psrc; 326 dst = (struct sockaddr_in6 *)sc->gif_pdst; 327 328 /* 329 * Check for address match. Note that the check is for an incoming 330 * packet. We should compare the *source* address in our configuration 331 * and the *destination* address of the packet, and vice versa. 332 */ 333 if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) || 334 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src)) 335 return 0; 336 337 /* martian filters on outer source - done in ip6_input */ 338 339 /* ingress filters on outer source */ 340 if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) { 341 struct sockaddr_in6 sin6; 342 struct rtentry *rt; 343 344 bzero(&sin6, sizeof(sin6)); 345 sin6.sin6_family = AF_INET6; 346 sin6.sin6_len = sizeof(struct sockaddr_in6); 347 sin6.sin6_addr = ip6->ip6_src; 348 sin6.sin6_scope_id = 0; /* XXX */ 349 350 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 351 if (!rt || rt->rt_ifp != ifp) { 352 #if 0 353 log(LOG_WARNING, "%s: packet from %s dropped " 354 "due to ingress filter\n", if_name(GIF2IFP(sc)), 355 ip6_sprintf(&sin6.sin6_addr)); 356 #endif 357 if (rt) 358 rtfree(rt); 359 return 0; 360 } 361 rtfree(rt); 362 } 363 364 return 128 * 2; 365 } 366 367 /* 368 * we know that we are in IFF_UP, outer address available, and outer family 369 * matched the physical addr family. see gif_encapcheck(). 370 * sanity check for arg should have been done in the caller. 371 */ 372 int 373 gif_encapcheck6(m, off, proto, arg) 374 const struct mbuf *m; 375 int off; 376 int proto; 377 void *arg; 378 { 379 struct ip6_hdr ip6; 380 struct gif_softc *sc; 381 struct ifnet *ifp; 382 383 /* sanity check done in caller */ 384 sc = (struct gif_softc *)arg; 385 386 /* LINTED const cast */ 387 m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6); 388 ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL; 389 390 return gif_validate6(&ip6, sc, ifp); 391 } 392 393 int 394 in6_gif_attach(sc) 395 struct gif_softc *sc; 396 { 397 sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck, 398 (struct protosw *)&in6_gif_protosw, sc); 399 if (sc->encap_cookie6 == NULL) 400 return EEXIST; 401 return 0; 402 } 403 404 int 405 in6_gif_detach(sc) 406 struct gif_softc *sc; 407 { 408 int error; 409 410 error = encap_detach(sc->encap_cookie6); 411 if (error == 0) 412 sc->encap_cookie6 = NULL; 413 return error; 414 }
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