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 /* $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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