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 /* $NetBSD: in6_gif.c,v 1.96 2022/12/07 08:30:15 knakahara Exp $ */ 2 /* $KAME: in6_gif.c,v 1.62 2001/07/29 04:27:25 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: in6_gif.c,v 1.96 2022/12/07 08:30:15 knakahara Exp $"); 35 36 #ifdef _KERNEL_OPT 37 #include "opt_inet.h" 38 #endif 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/socket.h> 43 #include <sys/sockio.h> 44 #include <sys/mbuf.h> 45 #include <sys/errno.h> 46 #include <sys/ioctl.h> 47 #include <sys/queue.h> 48 #include <sys/syslog.h> 49 #include <sys/kernel.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/ip6_private.h> 64 #include <netinet6/in6_gif.h> 65 #include <netinet6/in6_var.h> 66 #endif 67 #include <netinet6/ip6protosw.h> /* for struct ip6ctlparam */ 68 #include <netinet/ip_ecn.h> 69 70 #include <net/if_gif.h> 71 72 static int gif_validate6(const struct ip6_hdr *, struct gif_variant *, 73 struct ifnet *); 74 75 int ip6_gif_hlim = GIF_HLIM; 76 int ip6_gif_pmtu = 0; 77 78 static const struct encapsw in6_gif_encapsw; 79 80 /* 81 * family - family of the packet to be encapsulate. 82 */ 83 84 static int 85 in6_gif_output(struct gif_variant *var, int family, struct mbuf *m) 86 { 87 struct rtentry *rt; 88 struct gif_softc *sc; 89 struct sockaddr_in6 *sin6_src; 90 struct sockaddr_in6 *sin6_dst; 91 struct ifnet *ifp; 92 struct ip6_hdr *ip6; 93 struct route *ro_pc; 94 kmutex_t *lock_pc; 95 int proto, error; 96 u_int8_t itos, otos; 97 98 KASSERT(gif_heldref_variant(var)); 99 100 sin6_src = satosin6(var->gv_psrc); 101 sin6_dst = satosin6(var->gv_pdst); 102 ifp = &var->gv_softc->gif_if; 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 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 default: 143 #ifdef DEBUG 144 printf("in6_gif_output: warning: unknown family %d passed\n", 145 family); 146 #endif 147 m_freem(m); 148 return EAFNOSUPPORT; 149 } 150 151 /* prepend new IP header */ 152 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT); 153 if (m && m->m_len < sizeof(struct ip6_hdr)) 154 m = m_pullup(m, sizeof(struct ip6_hdr)); 155 if (m == NULL) 156 return ENOBUFS; 157 158 ip6 = mtod(m, struct ip6_hdr *); 159 ip6->ip6_flow = 0; 160 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 161 ip6->ip6_vfc |= IPV6_VERSION; 162 #if 0 /* ip6->ip6_plen will be filled by ip6_output */ 163 ip6->ip6_plen = htons((u_int16_t)m->m_pkthdr.len); 164 #endif 165 ip6->ip6_nxt = proto; 166 ip6->ip6_hlim = ip6_gif_hlim; 167 ip6->ip6_src = sin6_src->sin6_addr; 168 /* bidirectional configured tunnel mode */ 169 if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr)) 170 ip6->ip6_dst = sin6_dst->sin6_addr; 171 else { 172 m_freem(m); 173 return ENETUNREACH; 174 } 175 if (ifp->if_flags & IFF_LINK1) 176 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); 177 else 178 ip_ecn_ingress(ECN_NOCARE, &otos, &itos); 179 ip6->ip6_flow &= ~ntohl(0xff00000); 180 ip6->ip6_flow |= htonl((u_int32_t)otos << 20); 181 182 sc = ifp->if_softc; 183 if_tunnel_get_ro(sc->gif_ro_percpu, &ro_pc, &lock_pc); 184 rt = rtcache_lookup(ro_pc, var->gv_pdst); 185 if (rt == NULL) { 186 if_tunnel_put_ro(sc->gif_ro_percpu, lock_pc); 187 m_freem(m); 188 return ENETUNREACH; 189 } 190 191 /* If the route constitutes infinite encapsulation, punt. */ 192 if (rt->rt_ifp == ifp) { 193 rtcache_unref(rt, ro_pc); 194 rtcache_free(ro_pc); 195 if_tunnel_put_ro(sc->gif_ro_percpu, lock_pc); 196 m_freem(m); 197 return ENETUNREACH; /* XXX */ 198 } 199 rtcache_unref(rt, ro_pc); 200 201 #ifdef IPV6_MINMTU 202 int flags; 203 204 /* 205 * - GIF_PMTU_MINMTU 206 * Force fragmentation to minimum MTU to avoid path MTU discovery 207 * - GIF_PMTU_OUTERMTU 208 * Trust outer MTU is large enough to send all packets 209 * 210 * It is too painful to ask for resend of inner packet, to achieve 211 * path MTU discovery for encapsulated packets. 212 * 213 * See RFC4459. 214 */ 215 if (sc->gif_pmtu == GIF_PMTU_SYSDEFAULT) { 216 switch (ip6_gif_pmtu) { 217 case GIF_PMTU_MINMTU: 218 flags = IPV6_MINMTU; 219 break; 220 case GIF_PMTU_OUTERMTU: 221 flags = 0; 222 break; 223 default: 224 #ifdef DEBUG 225 log(LOG_DEBUG, "%s: ignore unexpected ip6_gif_pmtu %d\n", 226 __func__, ip6_gif_pmtu); 227 #endif 228 flags = IPV6_MINMTU; 229 break; 230 } 231 } else { 232 switch (sc->gif_pmtu) { 233 case GIF_PMTU_MINMTU: 234 flags = IPV6_MINMTU; 235 break; 236 case GIF_PMTU_OUTERMTU: 237 flags = 0; 238 break; 239 default: 240 #ifdef DEBUG 241 log(LOG_DEBUG, "%s: ignore unexpected gif_pmtu of %s %d\n", 242 __func__, ifp->if_xname, sc->gif_pmtu); 243 #endif 244 flags = IPV6_MINMTU; 245 break; 246 } 247 } 248 249 error = ip6_output(m, 0, ro_pc, flags, NULL, NULL, NULL); 250 #else 251 error = ip6_output(m, 0, ro_pc, 0, NULL, NULL, NULL); 252 #endif 253 if_tunnel_put_ro(sc->gif_ro_percpu, lock_pc); 254 return (error); 255 } 256 257 int 258 in6_gif_input(struct mbuf **mp, int *offp, int proto, void *eparg) 259 { 260 struct mbuf *m = *mp; 261 struct gif_softc *sc = eparg; 262 struct ifnet *gifp; 263 struct ip6_hdr *ip6; 264 int af = 0; 265 u_int32_t otos; 266 267 KASSERT(sc != NULL); 268 269 ip6 = mtod(m, struct ip6_hdr *); 270 271 gifp = &sc->gif_if; 272 if ((gifp->if_flags & IFF_UP) == 0) { 273 m_freem(m); 274 IP6_STATINC(IP6_STAT_NOGIF); 275 return IPPROTO_DONE; 276 } 277 #ifndef GIF_ENCAPCHECK 278 struct psref psref_var; 279 struct gif_variant *var = gif_getref_variant(sc, &psref_var); 280 /* other CPU do delete_tunnel */ 281 if (var->gv_psrc == NULL || var->gv_pdst == NULL) { 282 gif_putref_variant(var, &psref_var); 283 m_freem(m); 284 IP6_STATINC(IP6_STAT_NOGIF); 285 return IPPROTO_DONE; 286 } 287 288 struct psref psref; 289 struct ifnet *rcvif = m_get_rcvif_psref(m, &psref); 290 if (rcvif == NULL || !gif_validate6(ip6, var, rcvif)) { 291 m_put_rcvif_psref(rcvif, &psref); 292 gif_putref_variant(var, &psref_var); 293 m_freem(m); 294 IP6_STATINC(IP6_STAT_NOGIF); 295 return IPPROTO_DONE; 296 } 297 m_put_rcvif_psref(rcvif, &psref); 298 gif_putref_variant(var, &psref_var); 299 #endif 300 301 otos = ip6->ip6_flow; 302 m_adj(m, *offp); 303 304 switch (proto) { 305 #ifdef INET 306 case IPPROTO_IPV4: 307 { 308 struct ip *ip; 309 u_int8_t otos8; 310 af = AF_INET; 311 otos8 = (ntohl(otos) >> 20) & 0xff; 312 if (m->m_len < sizeof(*ip)) { 313 m = m_pullup(m, sizeof(*ip)); 314 if (!m) 315 return IPPROTO_DONE; 316 } 317 ip = mtod(m, struct ip *); 318 if (gifp->if_flags & IFF_LINK1) 319 ip_ecn_egress(ECN_ALLOWED, &otos8, &ip->ip_tos); 320 else 321 ip_ecn_egress(ECN_NOCARE, &otos8, &ip->ip_tos); 322 break; 323 } 324 #endif /* INET */ 325 #ifdef INET6 326 case IPPROTO_IPV6: 327 { 328 struct ip6_hdr *ip6x; 329 af = AF_INET6; 330 if (m->m_len < sizeof(*ip6x)) { 331 m = m_pullup(m, sizeof(*ip6x)); 332 if (!m) 333 return IPPROTO_DONE; 334 } 335 ip6x = mtod(m, struct ip6_hdr *); 336 if (gifp->if_flags & IFF_LINK1) 337 ip6_ecn_egress(ECN_ALLOWED, &otos, &ip6x->ip6_flow); 338 else 339 ip6_ecn_egress(ECN_NOCARE, &otos, &ip6x->ip6_flow); 340 break; 341 } 342 #endif 343 default: 344 IP6_STATINC(IP6_STAT_NOGIF); 345 m_freem(m); 346 return IPPROTO_DONE; 347 } 348 349 gif_input(m, af, gifp); 350 return IPPROTO_DONE; 351 } 352 353 /* 354 * validate outer address. 355 */ 356 static int 357 gif_validate6(const struct ip6_hdr *ip6, struct gif_variant *var, 358 struct ifnet *ifp) 359 { 360 const struct sockaddr_in6 *src, *dst; 361 int ret; 362 363 src = satosin6(var->gv_psrc); 364 dst = satosin6(var->gv_pdst); 365 366 ret = in6_tunnel_validate(ip6, &src->sin6_addr, &dst->sin6_addr); 367 if (ret == 0) 368 return 0; 369 370 /* ingress filters on outer source */ 371 if ((var->gv_softc->gif_if.if_flags & IFF_LINK2) == 0 && ifp) { 372 union { 373 struct sockaddr sa; 374 struct sockaddr_in6 sin6; 375 } u; 376 struct rtentry *rt; 377 378 /* XXX scopeid */ 379 sockaddr_in6_init(&u.sin6, &ip6->ip6_src, 0, 0, 0); 380 rt = rtalloc1(&u.sa, 0); 381 if (rt == NULL || rt->rt_ifp != ifp) { 382 #if 0 383 char ip6buf[INET6_ADDRSTRLEN]; 384 log(LOG_WARNING, "%s: packet from %s dropped " 385 "due to ingress filter\n", 386 if_name(&var->gv_softc->gif_if), 387 IN6_PRINT(ip6buf, &u.sin6.sin6_addr)); 388 #endif 389 if (rt != NULL) 390 rt_unref(rt); 391 return 0; 392 } 393 rt_unref(rt); 394 } 395 396 return ret; 397 } 398 399 #ifdef GIF_ENCAPCHECK 400 /* 401 * we know that we are in IFF_UP, outer address available, and outer family 402 * matched the physical addr family. see gif_encapcheck(). 403 */ 404 int 405 gif_encapcheck6(struct mbuf *m, int off, int proto, struct gif_variant *var) 406 { 407 struct ip6_hdr ip6; 408 struct ifnet *ifp = NULL; 409 int r; 410 struct psref psref; 411 412 m_copydata(m, 0, sizeof(ip6), (void *)&ip6); 413 if ((m->m_flags & M_PKTHDR) != 0) 414 ifp = m_get_rcvif_psref(m, &psref); 415 416 r = gif_validate6(&ip6, var, ifp); 417 418 m_put_rcvif_psref(ifp, &psref); 419 return r; 420 } 421 #endif 422 423 int 424 in6_gif_attach(struct gif_variant *var) 425 { 426 #ifndef GIF_ENCAPCHECK 427 struct sockaddr_in6 mask6; 428 429 memset(&mask6, 0, sizeof(mask6)); 430 mask6.sin6_len = sizeof(struct sockaddr_in6); 431 mask6.sin6_addr.s6_addr32[0] = mask6.sin6_addr.s6_addr32[1] = 432 mask6.sin6_addr.s6_addr32[2] = mask6.sin6_addr.s6_addr32[3] = ~0; 433 434 if (!var->gv_psrc || !var->gv_pdst) 435 return EINVAL; 436 437 var->gv_encap_cookie6 = encap_attach_addr(AF_INET6, -1, var->gv_psrc, 438 var->gv_pdst, NULL, &in6_gif_encapsw, var->gv_softc); 439 #else 440 var->gv_encap_cookie6 = encap_attach_addr(AF_INET6, -1, var->gv_psrc, 441 var->gv_pdst, gif_encapcheck, &in6_gif_encapsw, var->gv_softc); 442 #endif 443 if (var->gv_encap_cookie6 == NULL) 444 return EEXIST; 445 446 var->gv_output = in6_gif_output; 447 return 0; 448 } 449 450 int 451 in6_gif_detach(struct gif_variant *var) 452 { 453 int error; 454 struct gif_softc *sc = var->gv_softc; 455 456 error = encap_detach(var->gv_encap_cookie6); 457 if (error == 0) 458 var->gv_encap_cookie6 = NULL; 459 460 if_tunnel_ro_percpu_rtcache_free(sc->gif_ro_percpu); 461 462 return error; 463 } 464 465 void * 466 in6_gif_ctlinput(int cmd, const struct sockaddr *sa, void *d, void *eparg) 467 { 468 struct gif_softc *sc = eparg; 469 struct gif_variant *var; 470 struct ip6ctlparam *ip6cp = NULL; 471 struct ip6_hdr *ip6; 472 const struct sockaddr_in6 *dst6; 473 struct route *ro_pc; 474 kmutex_t *lock_pc; 475 struct psref psref; 476 477 if (sa->sa_family != AF_INET6 || 478 sa->sa_len != sizeof(struct sockaddr_in6)) 479 return NULL; 480 481 if ((unsigned)cmd >= PRC_NCMDS) 482 return NULL; 483 if (cmd == PRC_HOSTDEAD) 484 d = NULL; 485 else if (inet6ctlerrmap[cmd] == 0) 486 return NULL; 487 488 /* if the parameter is from icmp6, decode it. */ 489 if (d != NULL) { 490 ip6cp = (struct ip6ctlparam *)d; 491 ip6 = ip6cp->ip6c_ip6; 492 } else { 493 ip6 = NULL; 494 } 495 496 if (!ip6) 497 return NULL; 498 499 var = gif_getref_variant(sc, &psref); 500 if (var->gv_psrc == NULL || var->gv_pdst == NULL) { 501 gif_putref_variant(var, &psref); 502 return NULL; 503 } 504 if (var->gv_psrc->sa_family != AF_INET6) { 505 gif_putref_variant(var, &psref); 506 return NULL; 507 } 508 gif_putref_variant(var, &psref); 509 510 if_tunnel_get_ro(sc->gif_ro_percpu, &ro_pc, &lock_pc); 511 dst6 = satocsin6(rtcache_getdst(ro_pc)); 512 /* XXX scope */ 513 if (dst6 == NULL) 514 ; 515 else if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &dst6->sin6_addr)) 516 rtcache_free(ro_pc); 517 518 if_tunnel_put_ro(sc->gif_ro_percpu, lock_pc); 519 return NULL; 520 } 521 522 ENCAP_PR_WRAP_CTLINPUT(in6_gif_ctlinput) 523 #define in6_gif_ctlinput in6_gif_ctlinput_wrapper 524 525 static const struct encapsw in6_gif_encapsw = { 526 .encapsw6 = { 527 .pr_input = in6_gif_input, 528 .pr_ctlinput = in6_gif_ctlinput, 529 } 530 };
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