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 /*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: in6_gif.c,v 1.49 2001/05/14 14:02:17 itojun Exp $ 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD: releng/6.4/sys/netinet6/in6_gif.c 182649 2008-09-01 22:57:56Z obrien $"); 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/queue.h> 45 #include <sys/syslog.h> 46 #include <sys/protosw.h> 47 48 #include <sys/malloc.h> 49 50 #include <net/if.h> 51 #include <net/route.h> 52 53 #include <netinet/in.h> 54 #include <netinet/in_systm.h> 55 #ifdef INET 56 #include <netinet/ip.h> 57 #endif 58 #include <netinet/ip_encap.h> 59 #ifdef INET6 60 #include <netinet/ip6.h> 61 #include <netinet6/ip6_var.h> 62 #include <netinet6/in6_gif.h> 63 #include <netinet6/in6_var.h> 64 #endif 65 #include <netinet6/ip6protosw.h> 66 #include <netinet/ip_ecn.h> 67 #ifdef INET6 68 #include <netinet6/ip6_ecn.h> 69 #endif 70 71 #include <net/if_gif.h> 72 73 #include <net/net_osdep.h> 74 75 static int gif_validate6(const struct ip6_hdr *, struct gif_softc *, 76 struct ifnet *); 77 78 extern struct domain inet6domain; 79 struct ip6protosw in6_gif_protosw = 80 { SOCK_RAW, &inet6domain, 0/* IPPROTO_IPV[46] */, PR_ATOMIC|PR_ADDR, 81 in6_gif_input, rip6_output, 0, rip6_ctloutput, 82 0, 83 0, 0, 0, 0, 84 &rip6_usrreqs 85 }; 86 87 int 88 in6_gif_output(ifp, family, m) 89 struct ifnet *ifp; 90 int family; /* family of the packet to be encapsulate. */ 91 struct mbuf *m; 92 { 93 struct gif_softc *sc = ifp->if_softc; 94 struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst; 95 struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc; 96 struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst; 97 struct ip6_hdr *ip6; 98 struct etherip_header eiphdr; 99 int proto, error; 100 u_int8_t itos, otos; 101 102 GIF_LOCK_ASSERT(sc); 103 104 if (sin6_src == NULL || sin6_dst == NULL || 105 sin6_src->sin6_family != AF_INET6 || 106 sin6_dst->sin6_family != AF_INET6) { 107 m_freem(m); 108 return EAFNOSUPPORT; 109 } 110 111 switch (family) { 112 #ifdef INET 113 case AF_INET: 114 { 115 struct ip *ip; 116 117 proto = IPPROTO_IPV4; 118 if (m->m_len < sizeof(*ip)) { 119 m = m_pullup(m, sizeof(*ip)); 120 if (!m) 121 return ENOBUFS; 122 } 123 ip = mtod(m, struct ip *); 124 itos = ip->ip_tos; 125 break; 126 } 127 #endif 128 #ifdef INET6 129 case AF_INET6: 130 { 131 struct ip6_hdr *ip6; 132 proto = IPPROTO_IPV6; 133 if (m->m_len < sizeof(*ip6)) { 134 m = m_pullup(m, sizeof(*ip6)); 135 if (!m) 136 return ENOBUFS; 137 } 138 ip6 = mtod(m, struct ip6_hdr *); 139 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 140 break; 141 } 142 #endif 143 case AF_LINK: 144 proto = IPPROTO_ETHERIP; 145 eiphdr.eip_ver = ETHERIP_VERSION & ETHERIP_VER_VERS_MASK; 146 eiphdr.eip_pad = 0; 147 /* prepend Ethernet-in-IP header */ 148 M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT); 149 if (m && m->m_len < sizeof(struct etherip_header)) 150 m = m_pullup(m, sizeof(struct etherip_header)); 151 if (m == NULL) 152 return ENOBUFS; 153 bcopy(&eiphdr, mtod(m, struct etherip_header *), 154 sizeof(struct etherip_header)); 155 break; 156 157 default: 158 #ifdef DEBUG 159 printf("in6_gif_output: warning: unknown family %d passed\n", 160 family); 161 #endif 162 m_freem(m); 163 return EAFNOSUPPORT; 164 } 165 166 /* prepend new IP header */ 167 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT); 168 if (m && m->m_len < sizeof(struct ip6_hdr)) 169 m = m_pullup(m, sizeof(struct ip6_hdr)); 170 if (m == NULL) { 171 printf("ENOBUFS in in6_gif_output %d\n", __LINE__); 172 return ENOBUFS; 173 } 174 175 ip6 = mtod(m, struct ip6_hdr *); 176 ip6->ip6_flow = 0; 177 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 178 ip6->ip6_vfc |= IPV6_VERSION; 179 ip6->ip6_plen = htons((u_short)m->m_pkthdr.len); 180 ip6->ip6_nxt = proto; 181 ip6->ip6_hlim = ip6_gif_hlim; 182 ip6->ip6_src = sin6_src->sin6_addr; 183 /* bidirectional configured tunnel mode */ 184 if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr)) 185 ip6->ip6_dst = sin6_dst->sin6_addr; 186 else { 187 m_freem(m); 188 return ENETUNREACH; 189 } 190 ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE, 191 &otos, &itos); 192 ip6->ip6_flow &= ~htonl(0xff << 20); 193 ip6->ip6_flow |= htonl((u_int32_t)otos << 20); 194 195 if (dst->sin6_family != sin6_dst->sin6_family || 196 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) { 197 /* cache route doesn't match */ 198 bzero(dst, sizeof(*dst)); 199 dst->sin6_family = sin6_dst->sin6_family; 200 dst->sin6_len = sizeof(struct sockaddr_in6); 201 dst->sin6_addr = sin6_dst->sin6_addr; 202 if (sc->gif_ro6.ro_rt) { 203 RTFREE(sc->gif_ro6.ro_rt); 204 sc->gif_ro6.ro_rt = NULL; 205 } 206 #if 0 207 GIF2IFP(sc)->if_mtu = GIF_MTU; 208 #endif 209 } 210 211 if (sc->gif_ro6.ro_rt == NULL) { 212 rtalloc((struct route *)&sc->gif_ro6); 213 if (sc->gif_ro6.ro_rt == NULL) { 214 m_freem(m); 215 return ENETUNREACH; 216 } 217 218 /* if it constitutes infinite encapsulation, punt. */ 219 if (sc->gif_ro.ro_rt->rt_ifp == ifp) { 220 m_freem(m); 221 return ENETUNREACH; /*XXX*/ 222 } 223 #if 0 224 ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu 225 - sizeof(struct ip6_hdr); 226 #endif 227 } 228 229 #ifdef IPV6_MINMTU 230 /* 231 * force fragmentation to minimum MTU, to avoid path MTU discovery. 232 * it is too painful to ask for resend of inner packet, to achieve 233 * path MTU discovery for encapsulated packets. 234 */ 235 error = ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL); 236 #else 237 error = ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL); 238 #endif 239 240 if (!(GIF2IFP(sc)->if_flags & IFF_LINK0) && 241 sc->gif_ro6.ro_rt != NULL) { 242 RTFREE(sc->gif_ro6.ro_rt); 243 sc->gif_ro6.ro_rt = NULL; 244 } 245 246 return (error); 247 } 248 249 int 250 in6_gif_input(mp, offp, proto) 251 struct mbuf **mp; 252 int *offp, proto; 253 { 254 struct mbuf *m = *mp; 255 struct ifnet *gifp = NULL; 256 struct gif_softc *sc; 257 struct ip6_hdr *ip6; 258 int af = 0; 259 u_int32_t otos; 260 261 ip6 = mtod(m, struct ip6_hdr *); 262 263 sc = (struct gif_softc *)encap_getarg(m); 264 if (sc == NULL) { 265 m_freem(m); 266 ip6stat.ip6s_nogif++; 267 return IPPROTO_DONE; 268 } 269 270 gifp = GIF2IFP(sc); 271 if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) { 272 m_freem(m); 273 ip6stat.ip6s_nogif++; 274 return IPPROTO_DONE; 275 } 276 277 otos = ip6->ip6_flow; 278 m_adj(m, *offp); 279 280 switch (proto) { 281 #ifdef INET 282 case IPPROTO_IPV4: 283 { 284 struct ip *ip; 285 u_int8_t otos8; 286 af = AF_INET; 287 otos8 = (ntohl(otos) >> 20) & 0xff; 288 if (m->m_len < sizeof(*ip)) { 289 m = m_pullup(m, sizeof(*ip)); 290 if (!m) 291 return IPPROTO_DONE; 292 } 293 ip = mtod(m, struct ip *); 294 if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ? 295 ECN_ALLOWED : ECN_NOCARE, 296 &otos8, &ip->ip_tos) == 0) { 297 m_freem(m); 298 return IPPROTO_DONE; 299 } 300 break; 301 } 302 #endif /* INET */ 303 #ifdef INET6 304 case IPPROTO_IPV6: 305 { 306 struct ip6_hdr *ip6; 307 af = AF_INET6; 308 if (m->m_len < sizeof(*ip6)) { 309 m = m_pullup(m, sizeof(*ip6)); 310 if (!m) 311 return IPPROTO_DONE; 312 } 313 ip6 = mtod(m, struct ip6_hdr *); 314 if (ip6_ecn_egress((gifp->if_flags & IFF_LINK1) ? 315 ECN_ALLOWED : ECN_NOCARE, 316 &otos, &ip6->ip6_flow) == 0) { 317 m_freem(m); 318 return IPPROTO_DONE; 319 } 320 break; 321 } 322 #endif 323 case IPPROTO_ETHERIP: 324 af = AF_LINK; 325 break; 326 327 default: 328 ip6stat.ip6s_nogif++; 329 m_freem(m); 330 return IPPROTO_DONE; 331 } 332 333 gif_input(m, af, gifp); 334 return IPPROTO_DONE; 335 } 336 337 /* 338 * validate outer address. 339 */ 340 static int 341 gif_validate6(ip6, sc, ifp) 342 const struct ip6_hdr *ip6; 343 struct gif_softc *sc; 344 struct ifnet *ifp; 345 { 346 struct sockaddr_in6 *src, *dst; 347 348 src = (struct sockaddr_in6 *)sc->gif_psrc; 349 dst = (struct sockaddr_in6 *)sc->gif_pdst; 350 351 /* 352 * Check for address match. Note that the check is for an incoming 353 * packet. We should compare the *source* address in our configuration 354 * and the *destination* address of the packet, and vice versa. 355 */ 356 if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) || 357 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src)) 358 return 0; 359 360 /* martian filters on outer source - done in ip6_input */ 361 362 /* ingress filters on outer source */ 363 if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) { 364 struct sockaddr_in6 sin6; 365 struct rtentry *rt; 366 367 bzero(&sin6, sizeof(sin6)); 368 sin6.sin6_family = AF_INET6; 369 sin6.sin6_len = sizeof(struct sockaddr_in6); 370 sin6.sin6_addr = ip6->ip6_src; 371 sin6.sin6_scope_id = 0; /* XXX */ 372 373 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 374 if (!rt || rt->rt_ifp != ifp) { 375 #if 0 376 log(LOG_WARNING, "%s: packet from %s dropped " 377 "due to ingress filter\n", if_name(GIF2IFP(sc)), 378 ip6_sprintf(&sin6.sin6_addr)); 379 #endif 380 if (rt) 381 rtfree(rt); 382 return 0; 383 } 384 rtfree(rt); 385 } 386 387 return 128 * 2; 388 } 389 390 /* 391 * we know that we are in IFF_UP, outer address available, and outer family 392 * matched the physical addr family. see gif_encapcheck(). 393 * sanity check for arg should have been done in the caller. 394 */ 395 int 396 gif_encapcheck6(m, off, proto, arg) 397 const struct mbuf *m; 398 int off; 399 int proto; 400 void *arg; 401 { 402 struct ip6_hdr ip6; 403 struct gif_softc *sc; 404 struct ifnet *ifp; 405 406 /* sanity check done in caller */ 407 sc = (struct gif_softc *)arg; 408 409 /* LINTED const cast */ 410 m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6); 411 ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL; 412 413 return gif_validate6(&ip6, sc, ifp); 414 } 415 416 int 417 in6_gif_attach(sc) 418 struct gif_softc *sc; 419 { 420 sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck, 421 (struct protosw *)&in6_gif_protosw, sc); 422 if (sc->encap_cookie6 == NULL) 423 return EEXIST; 424 return 0; 425 } 426 427 int 428 in6_gif_detach(sc) 429 struct gif_softc *sc; 430 { 431 int error; 432 433 error = encap_detach(sc->encap_cookie6); 434 if (error == 0) 435 sc->encap_cookie6 = NULL; 436 return error; 437 }
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