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("$FreeBSD$"); 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/kernel.h> 45 #include <sys/queue.h> 46 #include <sys/syslog.h> 47 #include <sys/sysctl.h> 48 #include <sys/protosw.h> 49 #include <sys/malloc.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 #ifdef INET6 69 #include <netinet6/ip6_ecn.h> 70 #endif 71 72 #include <net/if_gif.h> 73 74 VNET_DEFINE(int, ip6_gif_hlim) = GIF_HLIM; 75 #define V_ip6_gif_hlim VNET(ip6_gif_hlim) 76 77 SYSCTL_DECL(_net_inet6_ip6); 78 SYSCTL_VNET_INT(_net_inet6_ip6, IPV6CTL_GIF_HLIM, gifhlim, CTLFLAG_RW, 79 &VNET_NAME(ip6_gif_hlim), 0, ""); 80 81 static int gif_validate6(const struct ip6_hdr *, struct gif_softc *, 82 struct ifnet *); 83 84 extern struct domain inet6domain; 85 struct ip6protosw in6_gif_protosw = { 86 .pr_type = SOCK_RAW, 87 .pr_domain = &inet6domain, 88 .pr_protocol = 0, /* IPPROTO_IPV[46] */ 89 .pr_flags = PR_ATOMIC|PR_ADDR, 90 .pr_input = in6_gif_input, 91 .pr_output = rip6_output, 92 .pr_ctloutput = rip6_ctloutput, 93 .pr_usrreqs = &rip6_usrreqs 94 }; 95 96 int 97 in6_gif_output(struct ifnet *ifp, 98 int family, /* family of the packet to be encapsulate */ 99 struct mbuf *m) 100 { 101 struct gif_softc *sc = ifp->if_softc; 102 struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst; 103 struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc; 104 struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst; 105 struct ip6_hdr *ip6; 106 struct etherip_header eiphdr; 107 int error, len, proto; 108 u_int8_t itos, otos; 109 110 GIF_LOCK_ASSERT(sc); 111 112 if (sin6_src == NULL || sin6_dst == NULL || 113 sin6_src->sin6_family != AF_INET6 || 114 sin6_dst->sin6_family != AF_INET6) { 115 m_freem(m); 116 return EAFNOSUPPORT; 117 } 118 119 switch (family) { 120 #ifdef INET 121 case AF_INET: 122 { 123 struct ip *ip; 124 125 proto = IPPROTO_IPV4; 126 if (m->m_len < sizeof(*ip)) { 127 m = m_pullup(m, sizeof(*ip)); 128 if (!m) 129 return ENOBUFS; 130 } 131 ip = mtod(m, struct ip *); 132 itos = ip->ip_tos; 133 break; 134 } 135 #endif 136 #ifdef INET6 137 case AF_INET6: 138 { 139 struct ip6_hdr *ip6; 140 proto = IPPROTO_IPV6; 141 if (m->m_len < sizeof(*ip6)) { 142 m = m_pullup(m, sizeof(*ip6)); 143 if (!m) 144 return ENOBUFS; 145 } 146 ip6 = mtod(m, struct ip6_hdr *); 147 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 148 break; 149 } 150 #endif 151 case AF_LINK: 152 proto = IPPROTO_ETHERIP; 153 154 /* 155 * GIF_SEND_REVETHIP (disabled by default) intentionally 156 * sends an EtherIP packet with revered version field in 157 * the header. This is a knob for backward compatibility 158 * with FreeBSD 7.2R or prior. 159 */ 160 if ((sc->gif_options & GIF_SEND_REVETHIP)) { 161 eiphdr.eip_ver = 0; 162 eiphdr.eip_resvl = ETHERIP_VERSION; 163 eiphdr.eip_resvh = 0; 164 } else { 165 eiphdr.eip_ver = ETHERIP_VERSION; 166 eiphdr.eip_resvl = 0; 167 eiphdr.eip_resvh = 0; 168 } 169 /* prepend Ethernet-in-IP header */ 170 M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT); 171 if (m && m->m_len < sizeof(struct etherip_header)) 172 m = m_pullup(m, sizeof(struct etherip_header)); 173 if (m == NULL) 174 return ENOBUFS; 175 bcopy(&eiphdr, mtod(m, struct etherip_header *), 176 sizeof(struct etherip_header)); 177 break; 178 179 default: 180 #ifdef DEBUG 181 printf("in6_gif_output: warning: unknown family %d passed\n", 182 family); 183 #endif 184 m_freem(m); 185 return EAFNOSUPPORT; 186 } 187 188 /* prepend new IP header */ 189 len = sizeof(struct ip6_hdr); 190 #ifndef __NO_STRICT_ALIGNMENT 191 if (family == AF_LINK) 192 len += ETHERIP_ALIGN; 193 #endif 194 M_PREPEND(m, len, M_DONTWAIT); 195 if (m != NULL && m->m_len < len) 196 m = m_pullup(m, len); 197 if (m == NULL) { 198 printf("ENOBUFS in in6_gif_output %d\n", __LINE__); 199 return ENOBUFS; 200 } 201 #ifndef __NO_STRICT_ALIGNMENT 202 if (family == AF_LINK) { 203 len = mtod(m, vm_offset_t) & 3; 204 KASSERT(len == 0 || len == ETHERIP_ALIGN, 205 ("in6_gif_output: unexpected misalignment")); 206 m->m_data += len; 207 m->m_len -= ETHERIP_ALIGN; 208 } 209 #endif 210 211 ip6 = mtod(m, struct ip6_hdr *); 212 ip6->ip6_flow = 0; 213 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 214 ip6->ip6_vfc |= IPV6_VERSION; 215 ip6->ip6_plen = htons((u_short)m->m_pkthdr.len); 216 ip6->ip6_nxt = proto; 217 ip6->ip6_hlim = V_ip6_gif_hlim; 218 ip6->ip6_src = sin6_src->sin6_addr; 219 /* bidirectional configured tunnel mode */ 220 if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr)) 221 ip6->ip6_dst = sin6_dst->sin6_addr; 222 else { 223 m_freem(m); 224 return ENETUNREACH; 225 } 226 ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE, 227 &otos, &itos); 228 ip6->ip6_flow &= ~htonl(0xff << 20); 229 ip6->ip6_flow |= htonl((u_int32_t)otos << 20); 230 231 M_SETFIB(m, sc->gif_fibnum); 232 233 if (dst->sin6_family != sin6_dst->sin6_family || 234 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) { 235 /* cache route doesn't match */ 236 bzero(dst, sizeof(*dst)); 237 dst->sin6_family = sin6_dst->sin6_family; 238 dst->sin6_len = sizeof(struct sockaddr_in6); 239 dst->sin6_addr = sin6_dst->sin6_addr; 240 if (sc->gif_ro6.ro_rt) { 241 RTFREE(sc->gif_ro6.ro_rt); 242 sc->gif_ro6.ro_rt = NULL; 243 } 244 #if 0 245 GIF2IFP(sc)->if_mtu = GIF_MTU; 246 #endif 247 } 248 249 if (sc->gif_ro6.ro_rt == NULL) { 250 in6_rtalloc(&sc->gif_ro6, sc->gif_fibnum); 251 if (sc->gif_ro6.ro_rt == NULL) { 252 m_freem(m); 253 return ENETUNREACH; 254 } 255 256 /* if it constitutes infinite encapsulation, punt. */ 257 if (sc->gif_ro.ro_rt->rt_ifp == ifp) { 258 m_freem(m); 259 return ENETUNREACH; /*XXX*/ 260 } 261 #if 0 262 ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu 263 - sizeof(struct ip6_hdr); 264 #endif 265 } 266 267 m_addr_changed(m); 268 269 #ifdef IPV6_MINMTU 270 /* 271 * force fragmentation to minimum MTU, to avoid path MTU discovery. 272 * it is too painful to ask for resend of inner packet, to achieve 273 * path MTU discovery for encapsulated packets. 274 */ 275 error = ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL); 276 #else 277 error = ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL); 278 #endif 279 280 if (!(GIF2IFP(sc)->if_flags & IFF_LINK0) && 281 sc->gif_ro6.ro_rt != NULL) { 282 RTFREE(sc->gif_ro6.ro_rt); 283 sc->gif_ro6.ro_rt = NULL; 284 } 285 286 return (error); 287 } 288 289 int 290 in6_gif_input(struct mbuf **mp, int *offp, int proto) 291 { 292 struct mbuf *m = *mp; 293 struct ifnet *gifp = NULL; 294 struct gif_softc *sc; 295 struct ip6_hdr *ip6; 296 int af = 0; 297 u_int32_t otos; 298 299 ip6 = mtod(m, struct ip6_hdr *); 300 301 sc = (struct gif_softc *)encap_getarg(m); 302 if (sc == NULL) { 303 m_freem(m); 304 IP6STAT_INC(ip6s_nogif); 305 return IPPROTO_DONE; 306 } 307 308 gifp = GIF2IFP(sc); 309 if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) { 310 m_freem(m); 311 IP6STAT_INC(ip6s_nogif); 312 return IPPROTO_DONE; 313 } 314 315 otos = ip6->ip6_flow; 316 m_adj(m, *offp); 317 318 switch (proto) { 319 #ifdef INET 320 case IPPROTO_IPV4: 321 { 322 struct ip *ip; 323 u_int8_t otos8; 324 af = AF_INET; 325 otos8 = (ntohl(otos) >> 20) & 0xff; 326 if (m->m_len < sizeof(*ip)) { 327 m = m_pullup(m, sizeof(*ip)); 328 if (!m) 329 return IPPROTO_DONE; 330 } 331 ip = mtod(m, struct ip *); 332 if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ? 333 ECN_ALLOWED : ECN_NOCARE, 334 &otos8, &ip->ip_tos) == 0) { 335 m_freem(m); 336 return IPPROTO_DONE; 337 } 338 break; 339 } 340 #endif /* INET */ 341 #ifdef INET6 342 case IPPROTO_IPV6: 343 { 344 struct ip6_hdr *ip6; 345 af = AF_INET6; 346 if (m->m_len < sizeof(*ip6)) { 347 m = m_pullup(m, sizeof(*ip6)); 348 if (!m) 349 return IPPROTO_DONE; 350 } 351 ip6 = mtod(m, struct ip6_hdr *); 352 if (ip6_ecn_egress((gifp->if_flags & IFF_LINK1) ? 353 ECN_ALLOWED : ECN_NOCARE, 354 &otos, &ip6->ip6_flow) == 0) { 355 m_freem(m); 356 return IPPROTO_DONE; 357 } 358 break; 359 } 360 #endif 361 case IPPROTO_ETHERIP: 362 af = AF_LINK; 363 break; 364 365 default: 366 IP6STAT_INC(ip6s_nogif); 367 m_freem(m); 368 return IPPROTO_DONE; 369 } 370 371 gif_input(m, af, gifp); 372 return IPPROTO_DONE; 373 } 374 375 /* 376 * validate outer address. 377 */ 378 static int 379 gif_validate6(const struct ip6_hdr *ip6, struct gif_softc *sc, 380 struct ifnet *ifp) 381 { 382 struct sockaddr_in6 *src, *dst; 383 384 src = (struct sockaddr_in6 *)sc->gif_psrc; 385 dst = (struct sockaddr_in6 *)sc->gif_pdst; 386 387 /* 388 * Check for address match. Note that the check is for an incoming 389 * packet. We should compare the *source* address in our configuration 390 * and the *destination* address of the packet, and vice versa. 391 */ 392 if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) || 393 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src)) 394 return 0; 395 396 /* martian filters on outer source - done in ip6_input */ 397 398 /* ingress filters on outer source */ 399 if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) { 400 struct sockaddr_in6 sin6; 401 struct rtentry *rt; 402 403 bzero(&sin6, sizeof(sin6)); 404 sin6.sin6_family = AF_INET6; 405 sin6.sin6_len = sizeof(struct sockaddr_in6); 406 sin6.sin6_addr = ip6->ip6_src; 407 sin6.sin6_scope_id = 0; /* XXX */ 408 409 rt = in6_rtalloc1((struct sockaddr *)&sin6, 0, 0UL, 410 sc->gif_fibnum); 411 if (!rt || rt->rt_ifp != ifp) { 412 #if 0 413 char ip6buf[INET6_ADDRSTRLEN]; 414 log(LOG_WARNING, "%s: packet from %s dropped " 415 "due to ingress filter\n", if_name(GIF2IFP(sc)), 416 ip6_sprintf(ip6buf, &sin6.sin6_addr)); 417 #endif 418 if (rt) 419 RTFREE_LOCKED(rt); 420 return 0; 421 } 422 RTFREE_LOCKED(rt); 423 } 424 425 return 128 * 2; 426 } 427 428 /* 429 * we know that we are in IFF_UP, outer address available, and outer family 430 * matched the physical addr family. see gif_encapcheck(). 431 * sanity check for arg should have been done in the caller. 432 */ 433 int 434 gif_encapcheck6(const struct mbuf *m, int off, int proto, void *arg) 435 { 436 struct ip6_hdr ip6; 437 struct gif_softc *sc; 438 struct ifnet *ifp; 439 440 /* sanity check done in caller */ 441 sc = (struct gif_softc *)arg; 442 443 /* LINTED const cast */ 444 m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6); 445 ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL; 446 447 return gif_validate6(&ip6, sc, ifp); 448 } 449 450 int 451 in6_gif_attach(struct gif_softc *sc) 452 { 453 sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck, 454 (void *)&in6_gif_protosw, sc); 455 if (sc->encap_cookie6 == NULL) 456 return EEXIST; 457 return 0; 458 } 459 460 int 461 in6_gif_detach(struct gif_softc *sc) 462 { 463 int error; 464 465 error = encap_detach(sc->encap_cookie6); 466 if (error == 0) 467 sc->encap_cookie6 = NULL; 468 return error; 469 }
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