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/7.4/sys/netinet/in_gif.c 196918 2009-09-07 10:15:50Z ume $"); 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 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 #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 static int ip_gif_ttl = GIF_TTL; 89 SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW, 90 &ip_gif_ttl, 0, ""); 91 92 int 93 in_gif_output(struct ifnet *ifp, int family, struct mbuf *m) 94 { 95 struct gif_softc *sc = ifp->if_softc; 96 struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst; 97 struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc; 98 struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst; 99 struct ip iphdr; /* capsule IP header, host byte ordered */ 100 struct etherip_header eiphdr; 101 int error, len, proto; 102 u_int8_t tos; 103 104 GIF_LOCK_ASSERT(sc); 105 106 if (sin_src == NULL || sin_dst == NULL || 107 sin_src->sin_family != AF_INET || 108 sin_dst->sin_family != AF_INET) { 109 m_freem(m); 110 return EAFNOSUPPORT; 111 } 112 113 switch (family) { 114 #ifdef INET 115 case AF_INET: 116 { 117 struct ip *ip; 118 119 proto = IPPROTO_IPV4; 120 if (m->m_len < sizeof(*ip)) { 121 m = m_pullup(m, sizeof(*ip)); 122 if (!m) 123 return ENOBUFS; 124 } 125 ip = mtod(m, struct ip *); 126 tos = ip->ip_tos; 127 break; 128 } 129 #endif /* INET */ 130 #ifdef INET6 131 case AF_INET6: 132 { 133 struct ip6_hdr *ip6; 134 proto = IPPROTO_IPV6; 135 if (m->m_len < sizeof(*ip6)) { 136 m = m_pullup(m, sizeof(*ip6)); 137 if (!m) 138 return ENOBUFS; 139 } 140 ip6 = mtod(m, struct ip6_hdr *); 141 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 142 break; 143 } 144 #endif /* INET6 */ 145 case AF_LINK: 146 proto = IPPROTO_ETHERIP; 147 148 /* 149 * GIF_SEND_REVETHIP (disabled by default) intentionally 150 * sends an EtherIP packet with revered version field in 151 * the header. This is a knob for backward compatibility 152 * with FreeBSD 7.2R or prior. 153 */ 154 if ((sc->gif_options & GIF_SEND_REVETHIP)) { 155 eiphdr.eip_ver = 0; 156 eiphdr.eip_resvl = ETHERIP_VERSION; 157 eiphdr.eip_resvh = 0; 158 } else { 159 eiphdr.eip_ver = ETHERIP_VERSION; 160 eiphdr.eip_resvl = 0; 161 eiphdr.eip_resvh = 0; 162 } 163 /* prepend Ethernet-in-IP header */ 164 M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT); 165 if (m && m->m_len < sizeof(struct etherip_header)) 166 m = m_pullup(m, sizeof(struct etherip_header)); 167 if (m == NULL) 168 return ENOBUFS; 169 bcopy(&eiphdr, mtod(m, struct etherip_header *), 170 sizeof(struct etherip_header)); 171 break; 172 173 default: 174 #ifdef DEBUG 175 printf("in_gif_output: warning: unknown family %d passed\n", 176 family); 177 #endif 178 m_freem(m); 179 return EAFNOSUPPORT; 180 } 181 182 bzero(&iphdr, sizeof(iphdr)); 183 iphdr.ip_src = sin_src->sin_addr; 184 /* bidirectional configured tunnel mode */ 185 if (sin_dst->sin_addr.s_addr != INADDR_ANY) 186 iphdr.ip_dst = sin_dst->sin_addr; 187 else { 188 m_freem(m); 189 return ENETUNREACH; 190 } 191 iphdr.ip_p = proto; 192 /* version will be set in ip_output() */ 193 iphdr.ip_ttl = ip_gif_ttl; 194 iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip); 195 ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE, 196 &iphdr.ip_tos, &tos); 197 198 /* prepend new IP header */ 199 len = sizeof(struct ip); 200 #ifndef __NO_STRICT_ALIGNMENT 201 if (family == AF_LINK) 202 len += ETHERIP_ALIGN; 203 #endif 204 M_PREPEND(m, len, M_DONTWAIT); 205 if (m != NULL && m->m_len < len) 206 m = m_pullup(m, len); 207 if (m == NULL) { 208 printf("ENOBUFS in in_gif_output %d\n", __LINE__); 209 return ENOBUFS; 210 } 211 #ifndef __NO_STRICT_ALIGNMENT 212 if (family == AF_LINK) { 213 len = mtod(m, vm_offset_t) & 3; 214 KASSERT(len == 0 || len == ETHERIP_ALIGN, 215 ("in_gif_output: unexpected misalignment")); 216 m->m_data += len; 217 m->m_len -= ETHERIP_ALIGN; 218 } 219 #endif 220 bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip)); 221 222 M_SETFIB(m, sc->gif_fibnum); 223 224 if (dst->sin_family != sin_dst->sin_family || 225 dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) { 226 /* cache route doesn't match */ 227 bzero(dst, sizeof(*dst)); 228 dst->sin_family = sin_dst->sin_family; 229 dst->sin_len = sizeof(struct sockaddr_in); 230 dst->sin_addr = sin_dst->sin_addr; 231 if (sc->gif_ro.ro_rt) { 232 RTFREE(sc->gif_ro.ro_rt); 233 sc->gif_ro.ro_rt = NULL; 234 } 235 #if 0 236 GIF2IFP(sc)->if_mtu = GIF_MTU; 237 #endif 238 } 239 240 if (sc->gif_ro.ro_rt == NULL) { 241 in_rtalloc_ign(&sc->gif_ro, 0, sc->gif_fibnum); 242 if (sc->gif_ro.ro_rt == NULL) { 243 m_freem(m); 244 return ENETUNREACH; 245 } 246 247 /* if it constitutes infinite encapsulation, punt. */ 248 if (sc->gif_ro.ro_rt->rt_ifp == ifp) { 249 m_freem(m); 250 return ENETUNREACH; /* XXX */ 251 } 252 #if 0 253 ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu 254 - sizeof(struct ip); 255 #endif 256 } 257 258 error = ip_output(m, NULL, &sc->gif_ro, 0, NULL, NULL); 259 260 if (!(GIF2IFP(sc)->if_flags & IFF_LINK0) && 261 sc->gif_ro.ro_rt != NULL) { 262 RTFREE(sc->gif_ro.ro_rt); 263 sc->gif_ro.ro_rt = NULL; 264 } 265 266 return (error); 267 } 268 269 void 270 in_gif_input(struct mbuf *m, int off) 271 { 272 struct ifnet *gifp = NULL; 273 struct gif_softc *sc; 274 struct ip *ip; 275 int af; 276 u_int8_t otos; 277 int proto; 278 279 ip = mtod(m, struct ip *); 280 proto = ip->ip_p; 281 282 sc = (struct gif_softc *)encap_getarg(m); 283 if (sc == NULL) { 284 m_freem(m); 285 ipstat.ips_nogif++; 286 return; 287 } 288 289 gifp = GIF2IFP(sc); 290 if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) { 291 m_freem(m); 292 ipstat.ips_nogif++; 293 return; 294 } 295 296 otos = ip->ip_tos; 297 m_adj(m, off); 298 299 switch (proto) { 300 #ifdef INET 301 case IPPROTO_IPV4: 302 { 303 struct ip *ip; 304 af = AF_INET; 305 if (m->m_len < sizeof(*ip)) { 306 m = m_pullup(m, sizeof(*ip)); 307 if (!m) 308 return; 309 } 310 ip = mtod(m, struct ip *); 311 if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ? 312 ECN_ALLOWED : ECN_NOCARE, 313 &otos, &ip->ip_tos) == 0) { 314 m_freem(m); 315 return; 316 } 317 break; 318 } 319 #endif 320 #ifdef INET6 321 case IPPROTO_IPV6: 322 { 323 struct ip6_hdr *ip6; 324 u_int8_t itos, oitos; 325 326 af = AF_INET6; 327 if (m->m_len < sizeof(*ip6)) { 328 m = m_pullup(m, sizeof(*ip6)); 329 if (!m) 330 return; 331 } 332 ip6 = mtod(m, struct ip6_hdr *); 333 itos = oitos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 334 if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ? 335 ECN_ALLOWED : ECN_NOCARE, 336 &otos, &itos) == 0) { 337 m_freem(m); 338 return; 339 } 340 if (itos != oitos) { 341 ip6->ip6_flow &= ~htonl(0xff << 20); 342 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 343 } 344 break; 345 } 346 #endif /* INET6 */ 347 case IPPROTO_ETHERIP: 348 af = AF_LINK; 349 break; 350 351 default: 352 ipstat.ips_nogif++; 353 m_freem(m); 354 return; 355 } 356 gif_input(m, af, gifp); 357 return; 358 } 359 360 /* 361 * validate outer address. 362 */ 363 static int 364 gif_validate4(const struct ip *ip, struct gif_softc *sc, struct ifnet *ifp) 365 { 366 struct sockaddr_in *src, *dst; 367 struct in_ifaddr *ia4; 368 369 src = (struct sockaddr_in *)sc->gif_psrc; 370 dst = (struct sockaddr_in *)sc->gif_pdst; 371 372 /* check for address match */ 373 if (src->sin_addr.s_addr != ip->ip_dst.s_addr || 374 dst->sin_addr.s_addr != ip->ip_src.s_addr) 375 return 0; 376 377 /* martian filters on outer source - NOT done in ip_input! */ 378 if (IN_MULTICAST(ntohl(ip->ip_src.s_addr))) 379 return 0; 380 switch ((ntohl(ip->ip_src.s_addr) & 0xff000000) >> 24) { 381 case 0: case 127: case 255: 382 return 0; 383 } 384 /* reject packets with broadcast on source */ 385 TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_link) { 386 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 387 continue; 388 if (ip->ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 389 return 0; 390 } 391 392 /* ingress filters on outer source */ 393 if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) { 394 struct sockaddr_in sin; 395 struct rtentry *rt; 396 397 bzero(&sin, sizeof(sin)); 398 sin.sin_family = AF_INET; 399 sin.sin_len = sizeof(struct sockaddr_in); 400 sin.sin_addr = ip->ip_src; 401 /* XXX MRT check for the interface we would use on output */ 402 rt = in_rtalloc1((struct sockaddr *)&sin, 0, 403 0UL, sc->gif_fibnum); 404 if (!rt || rt->rt_ifp != ifp) { 405 #if 0 406 log(LOG_WARNING, "%s: packet from 0x%x dropped " 407 "due to ingress filter\n", if_name(GIF2IFP(sc)), 408 (u_int32_t)ntohl(sin.sin_addr.s_addr)); 409 #endif 410 if (rt) 411 RTFREE_LOCKED(rt); 412 return 0; 413 } 414 RTFREE_LOCKED(rt); 415 } 416 417 return 32 * 2; 418 } 419 420 /* 421 * we know that we are in IFF_UP, outer address available, and outer family 422 * matched the physical addr family. see gif_encapcheck(). 423 */ 424 int 425 gif_encapcheck4(const struct mbuf *m, int off, int proto, void *arg) 426 { 427 struct ip ip; 428 struct gif_softc *sc; 429 struct ifnet *ifp; 430 431 /* sanity check done in caller */ 432 sc = (struct gif_softc *)arg; 433 434 /* LINTED const cast */ 435 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip); 436 ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL; 437 438 return gif_validate4(&ip, sc, ifp); 439 } 440 441 int 442 in_gif_attach(struct gif_softc *sc) 443 { 444 sc->encap_cookie4 = encap_attach_func(AF_INET, -1, gif_encapcheck, 445 &in_gif_protosw, sc); 446 if (sc->encap_cookie4 == NULL) 447 return EEXIST; 448 return 0; 449 } 450 451 int 452 in_gif_detach(struct gif_softc *sc) 453 { 454 int error; 455 456 error = encap_detach(sc->encap_cookie4); 457 if (error == 0) 458 sc->encap_cookie4 = NULL; 459 return error; 460 }
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