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/8.0/sys/netinet6/in6_gif.c 196019 2009-08-01 19:26:27Z rwatson $"); 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 #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 70 #include <net/if_gif.h> 71 72 static int gif_validate6(const struct ip6_hdr *, struct gif_softc *, 73 struct ifnet *); 74 75 extern struct domain inet6domain; 76 struct ip6protosw in6_gif_protosw = { 77 .pr_type = SOCK_RAW, 78 .pr_domain = &inet6domain, 79 .pr_protocol = 0, /* IPPROTO_IPV[46] */ 80 .pr_flags = PR_ATOMIC|PR_ADDR, 81 .pr_input = in6_gif_input, 82 .pr_output = rip6_output, 83 .pr_ctloutput = rip6_ctloutput, 84 .pr_usrreqs = &rip6_usrreqs 85 }; 86 87 int 88 in6_gif_output(struct ifnet *ifp, 89 int family, /* family of the packet to be encapsulate */ 90 struct mbuf *m) 91 { 92 struct gif_softc *sc = ifp->if_softc; 93 struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst; 94 struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc; 95 struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst; 96 struct ip6_hdr *ip6; 97 struct etherip_header eiphdr; 98 int error, len, proto; 99 u_int8_t itos, otos; 100 101 GIF_LOCK_ASSERT(sc); 102 103 if (sin6_src == NULL || sin6_dst == NULL || 104 sin6_src->sin6_family != AF_INET6 || 105 sin6_dst->sin6_family != AF_INET6) { 106 m_freem(m); 107 return EAFNOSUPPORT; 108 } 109 110 switch (family) { 111 #ifdef INET 112 case AF_INET: 113 { 114 struct ip *ip; 115 116 proto = IPPROTO_IPV4; 117 if (m->m_len < sizeof(*ip)) { 118 m = m_pullup(m, sizeof(*ip)); 119 if (!m) 120 return ENOBUFS; 121 } 122 ip = mtod(m, struct ip *); 123 itos = ip->ip_tos; 124 break; 125 } 126 #endif 127 #ifdef INET6 128 case AF_INET6: 129 { 130 struct ip6_hdr *ip6; 131 proto = IPPROTO_IPV6; 132 if (m->m_len < sizeof(*ip6)) { 133 m = m_pullup(m, sizeof(*ip6)); 134 if (!m) 135 return ENOBUFS; 136 } 137 ip6 = mtod(m, struct ip6_hdr *); 138 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 139 break; 140 } 141 #endif 142 case AF_LINK: 143 proto = IPPROTO_ETHERIP; 144 145 /* 146 * GIF_SEND_REVETHIP (disabled by default) intentionally 147 * sends an EtherIP packet with revered version field in 148 * the header. This is a knob for backward compatibility 149 * with FreeBSD 7.2R or prior. 150 */ 151 if ((sc->gif_options & GIF_SEND_REVETHIP)) { 152 eiphdr.eip_ver = 0; 153 eiphdr.eip_resvl = ETHERIP_VERSION; 154 eiphdr.eip_resvh = 0; 155 } else { 156 eiphdr.eip_ver = ETHERIP_VERSION; 157 eiphdr.eip_resvl = 0; 158 eiphdr.eip_resvh = 0; 159 } 160 /* prepend Ethernet-in-IP header */ 161 M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT); 162 if (m && m->m_len < sizeof(struct etherip_header)) 163 m = m_pullup(m, sizeof(struct etherip_header)); 164 if (m == NULL) 165 return ENOBUFS; 166 bcopy(&eiphdr, mtod(m, struct etherip_header *), 167 sizeof(struct etherip_header)); 168 break; 169 170 default: 171 #ifdef DEBUG 172 printf("in6_gif_output: warning: unknown family %d passed\n", 173 family); 174 #endif 175 m_freem(m); 176 return EAFNOSUPPORT; 177 } 178 179 /* prepend new IP header */ 180 len = sizeof(struct ip6_hdr); 181 #ifndef __NO_STRICT_ALIGNMENT 182 if (family == AF_LINK) 183 len += ETHERIP_ALIGN; 184 #endif 185 M_PREPEND(m, len, M_DONTWAIT); 186 if (m != NULL && m->m_len < len) 187 m = m_pullup(m, len); 188 if (m == NULL) { 189 printf("ENOBUFS in in6_gif_output %d\n", __LINE__); 190 return ENOBUFS; 191 } 192 #ifndef __NO_STRICT_ALIGNMENT 193 if (family == AF_LINK) { 194 len = mtod(m, vm_offset_t) & 3; 195 KASSERT(len == 0 || len == ETHERIP_ALIGN, 196 ("in6_gif_output: unexpected misalignment")); 197 m->m_data += len; 198 m->m_len -= ETHERIP_ALIGN; 199 } 200 #endif 201 202 ip6 = mtod(m, struct ip6_hdr *); 203 ip6->ip6_flow = 0; 204 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 205 ip6->ip6_vfc |= IPV6_VERSION; 206 ip6->ip6_plen = htons((u_short)m->m_pkthdr.len); 207 ip6->ip6_nxt = proto; 208 ip6->ip6_hlim = V_ip6_gif_hlim; 209 ip6->ip6_src = sin6_src->sin6_addr; 210 /* bidirectional configured tunnel mode */ 211 if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr)) 212 ip6->ip6_dst = sin6_dst->sin6_addr; 213 else { 214 m_freem(m); 215 return ENETUNREACH; 216 } 217 ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE, 218 &otos, &itos); 219 ip6->ip6_flow &= ~htonl(0xff << 20); 220 ip6->ip6_flow |= htonl((u_int32_t)otos << 20); 221 222 if (dst->sin6_family != sin6_dst->sin6_family || 223 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) { 224 /* cache route doesn't match */ 225 bzero(dst, sizeof(*dst)); 226 dst->sin6_family = sin6_dst->sin6_family; 227 dst->sin6_len = sizeof(struct sockaddr_in6); 228 dst->sin6_addr = sin6_dst->sin6_addr; 229 if (sc->gif_ro6.ro_rt) { 230 RTFREE(sc->gif_ro6.ro_rt); 231 sc->gif_ro6.ro_rt = NULL; 232 } 233 #if 0 234 GIF2IFP(sc)->if_mtu = GIF_MTU; 235 #endif 236 } 237 238 if (sc->gif_ro6.ro_rt == NULL) { 239 rtalloc((struct route *)&sc->gif_ro6); 240 if (sc->gif_ro6.ro_rt == NULL) { 241 m_freem(m); 242 return ENETUNREACH; 243 } 244 245 /* if it constitutes infinite encapsulation, punt. */ 246 if (sc->gif_ro.ro_rt->rt_ifp == ifp) { 247 m_freem(m); 248 return ENETUNREACH; /*XXX*/ 249 } 250 #if 0 251 ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu 252 - sizeof(struct ip6_hdr); 253 #endif 254 } 255 256 #ifdef IPV6_MINMTU 257 /* 258 * force fragmentation to minimum MTU, to avoid path MTU discovery. 259 * it is too painful to ask for resend of inner packet, to achieve 260 * path MTU discovery for encapsulated packets. 261 */ 262 error = ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL); 263 #else 264 error = ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL); 265 #endif 266 267 if (!(GIF2IFP(sc)->if_flags & IFF_LINK0) && 268 sc->gif_ro6.ro_rt != NULL) { 269 RTFREE(sc->gif_ro6.ro_rt); 270 sc->gif_ro6.ro_rt = NULL; 271 } 272 273 return (error); 274 } 275 276 int 277 in6_gif_input(struct mbuf **mp, int *offp, int proto) 278 { 279 struct mbuf *m = *mp; 280 struct ifnet *gifp = NULL; 281 struct gif_softc *sc; 282 struct ip6_hdr *ip6; 283 int af = 0; 284 u_int32_t otos; 285 286 ip6 = mtod(m, struct ip6_hdr *); 287 288 sc = (struct gif_softc *)encap_getarg(m); 289 if (sc == NULL) { 290 m_freem(m); 291 V_ip6stat.ip6s_nogif++; 292 return IPPROTO_DONE; 293 } 294 295 gifp = GIF2IFP(sc); 296 if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) { 297 m_freem(m); 298 V_ip6stat.ip6s_nogif++; 299 return IPPROTO_DONE; 300 } 301 302 otos = ip6->ip6_flow; 303 m_adj(m, *offp); 304 305 switch (proto) { 306 #ifdef INET 307 case IPPROTO_IPV4: 308 { 309 struct ip *ip; 310 u_int8_t otos8; 311 af = AF_INET; 312 otos8 = (ntohl(otos) >> 20) & 0xff; 313 if (m->m_len < sizeof(*ip)) { 314 m = m_pullup(m, sizeof(*ip)); 315 if (!m) 316 return IPPROTO_DONE; 317 } 318 ip = mtod(m, struct ip *); 319 if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ? 320 ECN_ALLOWED : ECN_NOCARE, 321 &otos8, &ip->ip_tos) == 0) { 322 m_freem(m); 323 return IPPROTO_DONE; 324 } 325 break; 326 } 327 #endif /* INET */ 328 #ifdef INET6 329 case IPPROTO_IPV6: 330 { 331 struct ip6_hdr *ip6; 332 af = AF_INET6; 333 if (m->m_len < sizeof(*ip6)) { 334 m = m_pullup(m, sizeof(*ip6)); 335 if (!m) 336 return IPPROTO_DONE; 337 } 338 ip6 = mtod(m, struct ip6_hdr *); 339 if (ip6_ecn_egress((gifp->if_flags & IFF_LINK1) ? 340 ECN_ALLOWED : ECN_NOCARE, 341 &otos, &ip6->ip6_flow) == 0) { 342 m_freem(m); 343 return IPPROTO_DONE; 344 } 345 break; 346 } 347 #endif 348 case IPPROTO_ETHERIP: 349 af = AF_LINK; 350 break; 351 352 default: 353 V_ip6stat.ip6s_nogif++; 354 m_freem(m); 355 return IPPROTO_DONE; 356 } 357 358 gif_input(m, af, gifp); 359 return IPPROTO_DONE; 360 } 361 362 /* 363 * validate outer address. 364 */ 365 static int 366 gif_validate6(const struct ip6_hdr *ip6, struct gif_softc *sc, 367 struct ifnet *ifp) 368 { 369 struct sockaddr_in6 *src, *dst; 370 371 src = (struct sockaddr_in6 *)sc->gif_psrc; 372 dst = (struct sockaddr_in6 *)sc->gif_pdst; 373 374 /* 375 * Check for address match. Note that the check is for an incoming 376 * packet. We should compare the *source* address in our configuration 377 * and the *destination* address of the packet, and vice versa. 378 */ 379 if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) || 380 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src)) 381 return 0; 382 383 /* martian filters on outer source - done in ip6_input */ 384 385 /* ingress filters on outer source */ 386 if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) { 387 struct sockaddr_in6 sin6; 388 struct rtentry *rt; 389 390 bzero(&sin6, sizeof(sin6)); 391 sin6.sin6_family = AF_INET6; 392 sin6.sin6_len = sizeof(struct sockaddr_in6); 393 sin6.sin6_addr = ip6->ip6_src; 394 sin6.sin6_scope_id = 0; /* XXX */ 395 396 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 397 if (!rt || rt->rt_ifp != ifp) { 398 #if 0 399 char ip6buf[INET6_ADDRSTRLEN]; 400 log(LOG_WARNING, "%s: packet from %s dropped " 401 "due to ingress filter\n", if_name(GIF2IFP(sc)), 402 ip6_sprintf(ip6buf, &sin6.sin6_addr)); 403 #endif 404 if (rt) 405 RTFREE_LOCKED(rt); 406 return 0; 407 } 408 RTFREE_LOCKED(rt); 409 } 410 411 return 128 * 2; 412 } 413 414 /* 415 * we know that we are in IFF_UP, outer address available, and outer family 416 * matched the physical addr family. see gif_encapcheck(). 417 * sanity check for arg should have been done in the caller. 418 */ 419 int 420 gif_encapcheck6(const struct mbuf *m, int off, int proto, void *arg) 421 { 422 struct ip6_hdr ip6; 423 struct gif_softc *sc; 424 struct ifnet *ifp; 425 426 /* sanity check done in caller */ 427 sc = (struct gif_softc *)arg; 428 429 /* LINTED const cast */ 430 m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6); 431 ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL; 432 433 return gif_validate6(&ip6, sc, ifp); 434 } 435 436 int 437 in6_gif_attach(struct gif_softc *sc) 438 { 439 sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck, 440 (void *)&in6_gif_protosw, sc); 441 if (sc->encap_cookie6 == NULL) 442 return EEXIST; 443 return 0; 444 } 445 446 int 447 in6_gif_detach(struct gif_softc *sc) 448 { 449 int error; 450 451 error = encap_detach(sc->encap_cookie6); 452 if (error == 0) 453 sc->encap_cookie6 = NULL; 454 return error; 455 }
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