Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/in_gif.c
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1 /* $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 itojun Exp $ */ 2 3 /*- 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD: releng/8.0/sys/netinet/in_gif.c 196039 2009-08-02 19:43:32Z rwatson $"); 34 35 #include "opt_mrouting.h" 36 #include "opt_inet.h" 37 #include "opt_inet6.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/kernel.h> 46 #include <sys/sysctl.h> 47 #include <sys/protosw.h> 48 #include <sys/malloc.h> 49 50 #include <net/if.h> 51 #include <net/route.h> 52 #include <net/vnet.h> 53 54 #include <netinet/in.h> 55 #include <netinet/in_systm.h> 56 #include <netinet/ip.h> 57 #include <netinet/ip_var.h> 58 #include <netinet/in_gif.h> 59 #include <netinet/in_var.h> 60 #include <netinet/ip_encap.h> 61 #include <netinet/ip_ecn.h> 62 63 #ifdef INET6 64 #include <netinet/ip6.h> 65 #endif 66 67 #ifdef MROUTING 68 #include <netinet/ip_mroute.h> 69 #endif /* MROUTING */ 70 71 #include <net/if_gif.h> 72 73 static int gif_validate4(const struct ip *, struct gif_softc *, 74 struct ifnet *); 75 76 extern struct domain inetdomain; 77 struct protosw in_gif_protosw = { 78 .pr_type = SOCK_RAW, 79 .pr_domain = &inetdomain, 80 .pr_protocol = 0/* IPPROTO_IPV[46] */, 81 .pr_flags = PR_ATOMIC|PR_ADDR, 82 .pr_input = in_gif_input, 83 .pr_output = (pr_output_t*)rip_output, 84 .pr_ctloutput = rip_ctloutput, 85 .pr_usrreqs = &rip_usrreqs 86 }; 87 88 SYSCTL_VNET_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW, 89 &VNET_NAME(ip_gif_ttl), 0, ""); 90 91 int 92 in_gif_output(struct ifnet *ifp, int family, struct mbuf *m) 93 { 94 struct gif_softc *sc = ifp->if_softc; 95 struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst; 96 struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc; 97 struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst; 98 struct ip iphdr; /* capsule IP header, host byte ordered */ 99 struct etherip_header eiphdr; 100 int error, len, proto; 101 u_int8_t tos; 102 103 GIF_LOCK_ASSERT(sc); 104 105 if (sin_src == NULL || sin_dst == NULL || 106 sin_src->sin_family != AF_INET || 107 sin_dst->sin_family != AF_INET) { 108 m_freem(m); 109 return EAFNOSUPPORT; 110 } 111 112 switch (family) { 113 #ifdef INET 114 case AF_INET: 115 { 116 struct ip *ip; 117 118 proto = IPPROTO_IPV4; 119 if (m->m_len < sizeof(*ip)) { 120 m = m_pullup(m, sizeof(*ip)); 121 if (!m) 122 return ENOBUFS; 123 } 124 ip = mtod(m, struct ip *); 125 tos = ip->ip_tos; 126 break; 127 } 128 #endif /* INET */ 129 #ifdef INET6 130 case AF_INET6: 131 { 132 struct ip6_hdr *ip6; 133 proto = IPPROTO_IPV6; 134 if (m->m_len < sizeof(*ip6)) { 135 m = m_pullup(m, sizeof(*ip6)); 136 if (!m) 137 return ENOBUFS; 138 } 139 ip6 = mtod(m, struct ip6_hdr *); 140 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 141 break; 142 } 143 #endif /* INET6 */ 144 case AF_LINK: 145 proto = IPPROTO_ETHERIP; 146 147 /* 148 * GIF_SEND_REVETHIP (disabled by default) intentionally 149 * sends an EtherIP packet with revered version field in 150 * the header. This is a knob for backward compatibility 151 * with FreeBSD 7.2R or prior. 152 */ 153 if ((sc->gif_options & GIF_SEND_REVETHIP)) { 154 eiphdr.eip_ver = 0; 155 eiphdr.eip_resvl = ETHERIP_VERSION; 156 eiphdr.eip_resvh = 0; 157 } else { 158 eiphdr.eip_ver = ETHERIP_VERSION; 159 eiphdr.eip_resvl = 0; 160 eiphdr.eip_resvh = 0; 161 } 162 /* prepend Ethernet-in-IP header */ 163 M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT); 164 if (m && m->m_len < sizeof(struct etherip_header)) 165 m = m_pullup(m, sizeof(struct etherip_header)); 166 if (m == NULL) 167 return ENOBUFS; 168 bcopy(&eiphdr, mtod(m, struct etherip_header *), 169 sizeof(struct etherip_header)); 170 break; 171 172 default: 173 #ifdef DEBUG 174 printf("in_gif_output: warning: unknown family %d passed\n", 175 family); 176 #endif 177 m_freem(m); 178 return EAFNOSUPPORT; 179 } 180 181 bzero(&iphdr, sizeof(iphdr)); 182 iphdr.ip_src = sin_src->sin_addr; 183 /* bidirectional configured tunnel mode */ 184 if (sin_dst->sin_addr.s_addr != INADDR_ANY) 185 iphdr.ip_dst = sin_dst->sin_addr; 186 else { 187 m_freem(m); 188 return ENETUNREACH; 189 } 190 iphdr.ip_p = proto; 191 /* version will be set in ip_output() */ 192 iphdr.ip_ttl = V_ip_gif_ttl; 193 iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip); 194 ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE, 195 &iphdr.ip_tos, &tos); 196 197 /* prepend new IP header */ 198 len = sizeof(struct ip); 199 #ifndef __NO_STRICT_ALIGNMENT 200 if (family == AF_LINK) 201 len += ETHERIP_ALIGN; 202 #endif 203 M_PREPEND(m, len, M_DONTWAIT); 204 if (m != NULL && m->m_len < len) 205 m = m_pullup(m, len); 206 if (m == NULL) { 207 printf("ENOBUFS in in_gif_output %d\n", __LINE__); 208 return ENOBUFS; 209 } 210 #ifndef __NO_STRICT_ALIGNMENT 211 if (family == AF_LINK) { 212 len = mtod(m, vm_offset_t) & 3; 213 KASSERT(len == 0 || len == ETHERIP_ALIGN, 214 ("in_gif_output: unexpected misalignment")); 215 m->m_data += len; 216 m->m_len -= ETHERIP_ALIGN; 217 } 218 #endif 219 bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip)); 220 221 M_SETFIB(m, sc->gif_fibnum); 222 223 if (dst->sin_family != sin_dst->sin_family || 224 dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) { 225 /* cache route doesn't match */ 226 bzero(dst, sizeof(*dst)); 227 dst->sin_family = sin_dst->sin_family; 228 dst->sin_len = sizeof(struct sockaddr_in); 229 dst->sin_addr = sin_dst->sin_addr; 230 if (sc->gif_ro.ro_rt) { 231 RTFREE(sc->gif_ro.ro_rt); 232 sc->gif_ro.ro_rt = NULL; 233 } 234 #if 0 235 GIF2IFP(sc)->if_mtu = GIF_MTU; 236 #endif 237 } 238 239 if (sc->gif_ro.ro_rt == NULL) { 240 in_rtalloc_ign(&sc->gif_ro, 0, sc->gif_fibnum); 241 if (sc->gif_ro.ro_rt == NULL) { 242 m_freem(m); 243 return ENETUNREACH; 244 } 245 246 /* if it constitutes infinite encapsulation, punt. */ 247 if (sc->gif_ro.ro_rt->rt_ifp == ifp) { 248 m_freem(m); 249 return ENETUNREACH; /* XXX */ 250 } 251 #if 0 252 ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu 253 - sizeof(struct ip); 254 #endif 255 } 256 257 error = ip_output(m, NULL, &sc->gif_ro, 0, NULL, NULL); 258 259 if (!(GIF2IFP(sc)->if_flags & IFF_LINK0) && 260 sc->gif_ro.ro_rt != NULL) { 261 RTFREE(sc->gif_ro.ro_rt); 262 sc->gif_ro.ro_rt = NULL; 263 } 264 265 return (error); 266 } 267 268 void 269 in_gif_input(struct mbuf *m, int off) 270 { 271 struct ifnet *gifp = NULL; 272 struct gif_softc *sc; 273 struct ip *ip; 274 int af; 275 u_int8_t otos; 276 int proto; 277 278 ip = mtod(m, struct ip *); 279 proto = ip->ip_p; 280 281 sc = (struct gif_softc *)encap_getarg(m); 282 if (sc == NULL) { 283 m_freem(m); 284 KMOD_IPSTAT_INC(ips_nogif); 285 return; 286 } 287 288 gifp = GIF2IFP(sc); 289 if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) { 290 m_freem(m); 291 KMOD_IPSTAT_INC(ips_nogif); 292 return; 293 } 294 295 otos = ip->ip_tos; 296 m_adj(m, off); 297 298 switch (proto) { 299 #ifdef INET 300 case IPPROTO_IPV4: 301 { 302 struct ip *ip; 303 af = AF_INET; 304 if (m->m_len < sizeof(*ip)) { 305 m = m_pullup(m, sizeof(*ip)); 306 if (!m) 307 return; 308 } 309 ip = mtod(m, struct ip *); 310 if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ? 311 ECN_ALLOWED : ECN_NOCARE, 312 &otos, &ip->ip_tos) == 0) { 313 m_freem(m); 314 return; 315 } 316 break; 317 } 318 #endif 319 #ifdef INET6 320 case IPPROTO_IPV6: 321 { 322 struct ip6_hdr *ip6; 323 u_int8_t itos, oitos; 324 325 af = AF_INET6; 326 if (m->m_len < sizeof(*ip6)) { 327 m = m_pullup(m, sizeof(*ip6)); 328 if (!m) 329 return; 330 } 331 ip6 = mtod(m, struct ip6_hdr *); 332 itos = oitos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 333 if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ? 334 ECN_ALLOWED : ECN_NOCARE, 335 &otos, &itos) == 0) { 336 m_freem(m); 337 return; 338 } 339 if (itos != oitos) { 340 ip6->ip6_flow &= ~htonl(0xff << 20); 341 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 342 } 343 break; 344 } 345 #endif /* INET6 */ 346 case IPPROTO_ETHERIP: 347 af = AF_LINK; 348 break; 349 350 default: 351 KMOD_IPSTAT_INC(ips_nogif); 352 m_freem(m); 353 return; 354 } 355 gif_input(m, af, gifp); 356 return; 357 } 358 359 /* 360 * validate outer address. 361 */ 362 static int 363 gif_validate4(const struct ip *ip, struct gif_softc *sc, struct ifnet *ifp) 364 { 365 struct sockaddr_in *src, *dst; 366 struct in_ifaddr *ia4; 367 368 src = (struct sockaddr_in *)sc->gif_psrc; 369 dst = (struct sockaddr_in *)sc->gif_pdst; 370 371 /* check for address match */ 372 if (src->sin_addr.s_addr != ip->ip_dst.s_addr || 373 dst->sin_addr.s_addr != ip->ip_src.s_addr) 374 return 0; 375 376 /* martian filters on outer source - NOT done in ip_input! */ 377 if (IN_MULTICAST(ntohl(ip->ip_src.s_addr))) 378 return 0; 379 switch ((ntohl(ip->ip_src.s_addr) & 0xff000000) >> 24) { 380 case 0: case 127: case 255: 381 return 0; 382 } 383 384 /* reject packets with broadcast on source */ 385 /* XXXRW: should use hash lists? */ 386 IN_IFADDR_RLOCK(); 387 TAILQ_FOREACH(ia4, &V_in_ifaddrhead, ia_link) { 388 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 389 continue; 390 if (ip->ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr) { 391 IN_IFADDR_RUNLOCK(); 392 return 0; 393 } 394 } 395 IN_IFADDR_RUNLOCK(); 396 397 /* ingress filters on outer source */ 398 if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) { 399 struct sockaddr_in sin; 400 struct rtentry *rt; 401 402 bzero(&sin, sizeof(sin)); 403 sin.sin_family = AF_INET; 404 sin.sin_len = sizeof(struct sockaddr_in); 405 sin.sin_addr = ip->ip_src; 406 /* XXX MRT check for the interface we would use on output */ 407 rt = in_rtalloc1((struct sockaddr *)&sin, 0, 408 0UL, sc->gif_fibnum); 409 if (!rt || rt->rt_ifp != ifp) { 410 #if 0 411 log(LOG_WARNING, "%s: packet from 0x%x dropped " 412 "due to ingress filter\n", if_name(GIF2IFP(sc)), 413 (u_int32_t)ntohl(sin.sin_addr.s_addr)); 414 #endif 415 if (rt) 416 RTFREE_LOCKED(rt); 417 return 0; 418 } 419 RTFREE_LOCKED(rt); 420 } 421 422 return 32 * 2; 423 } 424 425 /* 426 * we know that we are in IFF_UP, outer address available, and outer family 427 * matched the physical addr family. see gif_encapcheck(). 428 */ 429 int 430 gif_encapcheck4(const struct mbuf *m, int off, int proto, void *arg) 431 { 432 struct ip ip; 433 struct gif_softc *sc; 434 struct ifnet *ifp; 435 436 /* sanity check done in caller */ 437 sc = (struct gif_softc *)arg; 438 439 /* LINTED const cast */ 440 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip); 441 ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL; 442 443 return gif_validate4(&ip, sc, ifp); 444 } 445 446 int 447 in_gif_attach(struct gif_softc *sc) 448 { 449 sc->encap_cookie4 = encap_attach_func(AF_INET, -1, gif_encapcheck, 450 &in_gif_protosw, sc); 451 if (sc->encap_cookie4 == NULL) 452 return EEXIST; 453 return 0; 454 } 455 456 int 457 in_gif_detach(struct gif_softc *sc) 458 { 459 int error; 460 461 error = encap_detach(sc->encap_cookie4); 462 if (error == 0) 463 sc->encap_cookie4 = NULL; 464 return error; 465 }
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