if_stf.c revision 1.4.2.3
1 /* $NetBSD: if_stf.c,v 1.4.2.3 2001/06/10 18:35:41 he Exp $ */ 2 /* $KAME: if_stf.c,v 1.39 2000/06/07 23:35:18 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 2000 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 /* 34 * 6to4 interface, based on draft-ietf-ngtrans-6to4-06.txt. 35 * 36 * 6to4 interface is NOT capable of link-layer (I mean, IPv4) multicasting. 37 * There is no address mapping defined from IPv6 multicast address to IPv4 38 * address. Therefore, we do not have IFF_MULTICAST on the interface. 39 * 40 * Due to the lack of address mapping for link-local addresses, we cannot 41 * throw packets toward link-local addresses (fe80::x). Also, we cannot throw 42 * packets to link-local multicast addresses (ff02::x). 43 * 44 * Here are interesting symptoms due to the lack of link-local address: 45 * 46 * Unicast routing exchange: 47 * - RIPng: Impossible. Uses link-local multicast packet toward ff02::9, 48 * and link-local addresses as nexthop. 49 * - OSPFv6: Impossible. OSPFv6 assumes that there's link-local address 50 * assigned to the link, and makes use of them. Also, HELLO packets use 51 * link-local multicast addresses (ff02::5 and ff02::6). 52 * - BGP4+: Maybe. You can only use global address as nexthop, and global 53 * address as TCP endpoint address. 54 * 55 * Multicast routing protocols: 56 * - PIM: Hello packet cannot be used to discover adjacent PIM routers. 57 * Adjacent PIM routers must be configured manually (is it really spec-wise 58 * correct thing to do?). 59 * 60 * ICMPv6: 61 * - Redirects cannot be used due to the lack of link-local address. 62 * 63 * Starting from 04 draft, the specification suggests how to construct 64 * link-local address for 6to4 interface. 65 * However, it seems to have no real use and does not help the above symptom 66 * much. Even if we assign link-locals to interface, we cannot really 67 * use link-local unicast/multicast on top of 6to4 cloud, and the above 68 * analysis does not change. 69 * 70 * 6to4 interface has security issues. Refer to 71 * http://playground.iijlab.net/i-d/draft-itojun-ipv6-transition-abuse-00.txt 72 * for details. The code tries to filter out some of malicious packets. 73 * Note that there is no way to be 100% secure. 74 */ 75 76 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 77 #include "opt_inet.h" 78 #include "opt_inet6.h" 79 #endif 80 #ifdef __NetBSD__ 81 #include "opt_inet.h" 82 #endif 83 84 #include <sys/param.h> 85 #include <sys/systm.h> 86 #include <sys/socket.h> 87 #include <sys/sockio.h> 88 #include <sys/mbuf.h> 89 #include <sys/errno.h> 90 #if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) 91 #include <sys/ioctl.h> 92 #endif 93 #include <sys/protosw.h> 94 #ifdef __FreeBSD__ 95 #include <sys/kernel.h> 96 #endif 97 #include <sys/queue.h> 98 #include <sys/syslog.h> 99 #include <machine/cpu.h> 100 101 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 102 #include <sys/malloc.h> 103 #endif 104 105 #include <net/if.h> 106 #include <net/route.h> 107 #include <net/netisr.h> 108 #include <net/if_types.h> 109 #include <net/if_stf.h> 110 111 #include <netinet/in.h> 112 #include <netinet/in_systm.h> 113 #include <netinet/ip.h> 114 #include <netinet/ip_var.h> 115 #include <netinet/in_var.h> 116 117 #include <netinet/ip6.h> 118 #include <netinet6/ip6_var.h> 119 #include <netinet6/in6_gif.h> 120 #include <netinet6/in6_var.h> 121 #include <netinet/ip_ecn.h> 122 123 #include <netinet/ip_encap.h> 124 125 #include <machine/stdarg.h> 126 127 #include <net/net_osdep.h> 128 129 #if defined(__FreeBSD__) && __FreeBSD__ >= 4 130 #include "bpf.h" 131 #define NBPFILTER NBPF 132 #else 133 #include "bpfilter.h" 134 #endif 135 #include "stf.h" 136 #include "gif.h" /*XXX*/ 137 138 #if NBPFILTER > 0 139 #include <net/bpf.h> 140 #endif 141 142 #if NGIF > 0 143 #include <net/if_gif.h> 144 #endif 145 146 #if NSTF > 0 147 #if NSTF != 1 148 # error only single stf interface allowed 149 #endif 150 151 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 152 #define GET_V4(x) ((struct in_addr *)(&(x)->s6_addr16[1])) 153 154 struct stf_softc { 155 struct ifnet sc_if; /* common area */ 156 union { 157 struct route __sc_ro4; 158 struct route_in6 __sc_ro6; /* just for safety */ 159 } __sc_ro46; 160 #define sc_ro __sc_ro46.__sc_ro4 161 const struct encaptab *encap_cookie; 162 }; 163 164 static struct stf_softc *stf; 165 static int nstf; 166 167 #if NGIF > 0 168 extern int ip_gif_ttl; /*XXX*/ 169 #else 170 static int ip_gif_ttl = 40; /*XXX*/ 171 #endif 172 173 extern struct protosw in_stf_protosw; 174 175 #ifdef __FreeBSD__ 176 void stfattach __P((void *)); 177 #else 178 void stfattach __P((int)); 179 #endif 180 static int stf_encapcheck __P((const struct mbuf *, int, int, void *)); 181 static struct in6_ifaddr *stf_getsrcifa6 __P((struct ifnet *)); 182 static int stf_output __P((struct ifnet *, struct mbuf *, struct sockaddr *, 183 struct rtentry *)); 184 static int stf_checkaddr4 __P((struct stf_softc *, struct in_addr *, 185 struct ifnet *)); 186 static int stf_checkaddr6 __P((struct stf_softc *, struct in6_addr *, 187 struct ifnet *)); 188 #if defined(__bsdi__) && _BSDI_VERSION >= 199802 189 static void stf_rtrequest __P((int, struct rtentry *, struct rt_addrinfo *)); 190 #else 191 static void stf_rtrequest __P((int, struct rtentry *, struct sockaddr *)); 192 #endif 193 #if defined(__FreeBSD__) && __FreeBSD__ < 3 194 static int stf_ioctl __P((struct ifnet *, int, caddr_t)); 195 #else 196 static int stf_ioctl __P((struct ifnet *, u_long, caddr_t)); 197 #endif 198 199 void 200 stfattach(dummy) 201 #ifdef __FreeBSD__ 202 void *dummy; 203 #else 204 int dummy; 205 #endif 206 { 207 struct stf_softc *sc; 208 int i; 209 const struct encaptab *p; 210 211 #ifdef __NetBSD__ 212 nstf = dummy; 213 #else 214 nstf = NSTF; 215 #endif 216 stf = malloc(nstf * sizeof(struct stf_softc), M_DEVBUF, M_WAIT); 217 bzero(stf, nstf * sizeof(struct stf_softc)); 218 sc = stf; 219 220 /* XXX just in case... */ 221 for (i = 0; i < nstf; i++) { 222 sc = &stf[i]; 223 bzero(sc, sizeof(*sc)); 224 #if defined(__NetBSD__) || defined(__OpenBSD__) 225 sprintf(sc->sc_if.if_xname, "stf%d", i); 226 #else 227 sc->sc_if.if_name = "stf"; 228 sc->sc_if.if_unit = i; 229 #endif 230 231 p = encap_attach_func(AF_INET, IPPROTO_IPV6, stf_encapcheck, 232 &in_stf_protosw, sc); 233 if (p == NULL) { 234 printf("%s: attach failed\n", if_name(&sc->sc_if)); 235 continue; 236 } 237 sc->encap_cookie = p; 238 239 sc->sc_if.if_mtu = IPV6_MMTU; 240 sc->sc_if.if_flags = 0; 241 sc->sc_if.if_ioctl = stf_ioctl; 242 sc->sc_if.if_output = stf_output; 243 sc->sc_if.if_type = IFT_STF; 244 #if defined(__FreeBSD__) && __FreeBSD__ >= 4 245 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN; 246 #endif 247 if_attach(&sc->sc_if); 248 #if NBPFILTER > 0 249 #ifdef HAVE_OLD_BPF 250 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 251 #else 252 bpfattach(&sc->sc_if.if_bpf, &sc->sc_if, DLT_NULL, sizeof(u_int)); 253 #endif 254 #endif 255 } 256 } 257 258 #ifdef __FreeBSD__ 259 PSEUDO_SET(stfattach, if_stf); 260 #endif 261 262 static int 263 stf_encapcheck(m, off, proto, arg) 264 const struct mbuf *m; 265 int off; 266 int proto; 267 void *arg; 268 { 269 struct ip ip; 270 struct in6_ifaddr *ia6; 271 struct stf_softc *sc; 272 struct in_addr a, b; 273 274 sc = (struct stf_softc *)arg; 275 if (sc == NULL) 276 return 0; 277 278 if ((sc->sc_if.if_flags & IFF_UP) == 0) 279 return 0; 280 281 if (proto != IPPROTO_IPV6) 282 return 0; 283 284 /* LINTED const cast */ 285 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); 286 287 if (ip.ip_v != 4) 288 return 0; 289 290 ia6 = stf_getsrcifa6(&sc->sc_if); 291 if (ia6 == NULL) 292 return 0; 293 294 /* 295 * check if IPv4 dst matches the IPv4 address derived from the 296 * local 6to4 address. 297 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 298 */ 299 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 300 sizeof(ip.ip_dst)) != 0) 301 return 0; 302 303 /* 304 * check if IPv4 src matches the IPv4 address derived from the 305 * local 6to4 address masked by prefixmask. 306 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 307 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 308 */ 309 bzero(&a, sizeof(a)); 310 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 311 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 312 b = ip.ip_src; 313 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 314 if (a.s_addr != b.s_addr) 315 return 0; 316 317 /* stf interface makes single side match only */ 318 return 32; 319 } 320 321 static struct in6_ifaddr * 322 stf_getsrcifa6(ifp) 323 struct ifnet *ifp; 324 { 325 struct ifaddr *ia; 326 struct in_ifaddr *ia4; 327 struct sockaddr_in6 *sin6; 328 struct in_addr in; 329 330 #if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3) 331 for (ia = ifp->if_addrlist; ia; ia = ia->ifa_next) 332 #else 333 for (ia = ifp->if_addrlist.tqh_first; 334 ia; 335 ia = ia->ifa_list.tqe_next) 336 #endif 337 { 338 if (ia->ifa_addr == NULL) 339 continue; 340 if (ia->ifa_addr->sa_family != AF_INET6) 341 continue; 342 sin6 = (struct sockaddr_in6 *)ia->ifa_addr; 343 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 344 continue; 345 346 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 347 #ifdef __NetBSD__ 348 INADDR_TO_IA(in, ia4); 349 #else 350 #ifdef __OpenBSD__ 351 for (ia4 = in_ifaddr.tqh_first; 352 ia4; 353 ia4 = ia4->ia_list.tqe_next) 354 #elif defined(__FreeBSD__) && __FreeBSD__ >= 3 355 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 356 ia4; 357 ia4 = TAILQ_NEXT(ia4, ia_link)) 358 #else 359 for (ia4 = in_ifaddr; ia4 != NULL; ia4 = ia4->ia_next) 360 #endif 361 { 362 if (ia4->ia_addr.sin_addr.s_addr == in.s_addr) 363 break; 364 } 365 #endif 366 if (ia4 == NULL) 367 continue; 368 369 return (struct in6_ifaddr *)ia; 370 } 371 372 return NULL; 373 } 374 375 static int 376 stf_output(ifp, m, dst, rt) 377 struct ifnet *ifp; 378 struct mbuf *m; 379 struct sockaddr *dst; 380 struct rtentry *rt; 381 { 382 struct stf_softc *sc; 383 struct sockaddr_in6 *dst6; 384 struct in_addr *in4; 385 struct sockaddr_in *dst4; 386 u_int8_t tos; 387 struct ip *ip; 388 struct ip6_hdr *ip6; 389 struct in6_ifaddr *ia6; 390 391 sc = (struct stf_softc*)ifp; 392 dst6 = (struct sockaddr_in6 *)dst; 393 394 /* just in case */ 395 if ((ifp->if_flags & IFF_UP) == 0) { 396 m_freem(m); 397 return ENETDOWN; 398 } 399 400 /* 401 * If we don't have an ip4 address that match my inner ip6 address, 402 * we shouldn't generate output. Without this check, we'll end up 403 * using wrong IPv4 source. 404 */ 405 ia6 = stf_getsrcifa6(ifp); 406 if (ia6 == NULL) { 407 m_freem(m); 408 return ENETDOWN; 409 } 410 411 if (m->m_len < sizeof(*ip6)) { 412 m = m_pullup(m, sizeof(*ip6)); 413 if (!m) 414 return ENOBUFS; 415 } 416 ip6 = mtod(m, struct ip6_hdr *); 417 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 418 419 /* 420 * Pickup the right outer dst addr from the list of candidates. 421 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 422 */ 423 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 424 in4 = GET_V4(&ip6->ip6_dst); 425 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 426 in4 = GET_V4(&dst6->sin6_addr); 427 else { 428 m_freem(m); 429 return ENETUNREACH; 430 } 431 432 #if NBPFILTER > 0 433 if (ifp->if_bpf) { 434 /* 435 * We need to prepend the address family as 436 * a four byte field. Cons up a dummy header 437 * to pacify bpf. This is safe because bpf 438 * will only read from the mbuf (i.e., it won't 439 * try to free it or keep a pointer a to it). 440 */ 441 struct mbuf m0; 442 u_int32_t af = AF_INET6; 443 444 m0.m_next = m; 445 m0.m_len = 4; 446 m0.m_data = (char *)⁡ 447 448 #ifdef HAVE_OLD_BPF 449 bpf_mtap(ifp, &m0); 450 #else 451 bpf_mtap(ifp->if_bpf, &m0); 452 #endif 453 } 454 #endif /*NBPFILTER > 0*/ 455 456 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 457 if (m && m->m_len < sizeof(struct ip)) 458 m = m_pullup(m, sizeof(struct ip)); 459 if (m == NULL) 460 return ENOBUFS; 461 ip = mtod(m, struct ip *); 462 463 bzero(ip, sizeof(*ip)); 464 465 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 466 &ip->ip_src, sizeof(ip->ip_src)); 467 bcopy(in4, &ip->ip_dst, sizeof(ip->ip_dst)); 468 ip->ip_p = IPPROTO_IPV6; 469 ip->ip_ttl = ip_gif_ttl; /*XXX*/ 470 ip->ip_len = m->m_pkthdr.len; /*host order*/ 471 if (ifp->if_flags & IFF_LINK1) 472 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 473 474 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst; 475 if (dst4->sin_family != AF_INET || 476 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) { 477 /* cache route doesn't match */ 478 dst4->sin_family = AF_INET; 479 dst4->sin_len = sizeof(struct sockaddr_in); 480 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr)); 481 if (sc->sc_ro.ro_rt) { 482 RTFREE(sc->sc_ro.ro_rt); 483 sc->sc_ro.ro_rt = NULL; 484 } 485 } 486 487 if (sc->sc_ro.ro_rt == NULL) { 488 rtalloc(&sc->sc_ro); 489 if (sc->sc_ro.ro_rt == NULL) { 490 m_freem(m); 491 return ENETUNREACH; 492 } 493 } 494 495 #ifndef __OpenBSD__ 496 return ip_output(m, NULL, &sc->sc_ro, 0, NULL); 497 #else 498 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 499 #endif 500 } 501 502 static int 503 stf_checkaddr4(sc, in, inifp) 504 struct stf_softc *sc; 505 struct in_addr *in; 506 struct ifnet *inifp; /* incoming interface */ 507 { 508 struct in_ifaddr *ia4; 509 510 /* 511 * reject packets with the following address: 512 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 513 */ 514 if (IN_MULTICAST(in->s_addr)) 515 return -1; 516 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 517 case 0: case 127: case 255: 518 return -1; 519 } 520 521 /* 522 * reject packets with broadcast 523 */ 524 #if defined(__OpenBSD__) || defined(__NetBSD__) 525 for (ia4 = in_ifaddr.tqh_first; ia4; ia4 = ia4->ia_list.tqe_next) 526 #elif defined(__FreeBSD__) && __FreeBSD__ >= 3 527 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 528 ia4; 529 ia4 = TAILQ_NEXT(ia4, ia_link)) 530 #else 531 for (ia4 = in_ifaddr; ia4 != NULL; ia4 = ia4->ia_next) 532 #endif 533 { 534 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 535 continue; 536 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 537 return -1; 538 } 539 540 /* 541 * perform ingress filter 542 */ 543 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 544 struct sockaddr_in sin; 545 struct rtentry *rt; 546 547 bzero(&sin, sizeof(sin)); 548 sin.sin_family = AF_INET; 549 sin.sin_len = sizeof(struct sockaddr_in); 550 sin.sin_addr = *in; 551 #ifdef __FreeBSD__ 552 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 553 #else 554 rt = rtalloc1((struct sockaddr *)&sin, 0); 555 #endif 556 if (!rt || rt->rt_ifp != inifp) { 557 #if 0 558 log(LOG_WARNING, "%s: packet from 0x%x dropped " 559 "due to ingress filter\n", if_name(&sc->sc_if), 560 (u_int32_t)ntohl(sin.sin_addr.s_addr)); 561 #endif 562 if (rt) 563 rtfree(rt); 564 return -1; 565 } 566 rtfree(rt); 567 } 568 569 return 0; 570 } 571 572 static int 573 stf_checkaddr6(sc, in6, inifp) 574 struct stf_softc *sc; 575 struct in6_addr *in6; 576 struct ifnet *inifp; /* incoming interface */ 577 { 578 /* 579 * check 6to4 addresses 580 */ 581 if (IN6_IS_ADDR_6TO4(in6)) 582 return stf_checkaddr4(sc, GET_V4(in6), inifp); 583 584 /* 585 * reject anything that look suspicious. the test is implemented 586 * in ip6_input too, but we check here as well to 587 * (1) reject bad packets earlier, and 588 * (2) to be safe against future ip6_input change. 589 */ 590 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 591 return -1; 592 593 return 0; 594 } 595 596 void 597 #if __STDC__ 598 in_stf_input(struct mbuf *m, ...) 599 #else 600 in_stf_input(m, va_alist) 601 struct mbuf *m; 602 #endif 603 { 604 int off, proto; 605 struct stf_softc *sc; 606 struct ip *ip; 607 struct ip6_hdr *ip6; 608 u_int8_t otos, itos; 609 int s, isr; 610 struct ifqueue *ifq = NULL; 611 struct ifnet *ifp; 612 va_list ap; 613 614 va_start(ap, m); 615 off = va_arg(ap, int); 616 proto = va_arg(ap, int); 617 va_end(ap); 618 619 if (proto != IPPROTO_IPV6) { 620 m_freem(m); 621 return; 622 } 623 624 ip = mtod(m, struct ip *); 625 626 sc = (struct stf_softc *)encap_getarg(m); 627 628 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 629 m_freem(m); 630 return; 631 } 632 633 ifp = &sc->sc_if; 634 635 /* 636 * perform sanity check against outer src/dst. 637 * for source, perform ingress filter as well. 638 */ 639 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 640 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 641 m_freem(m); 642 return; 643 } 644 645 otos = ip->ip_tos; 646 m_adj(m, off); 647 648 if (m->m_len < sizeof(*ip6)) { 649 m = m_pullup(m, sizeof(*ip6)); 650 if (!m) 651 return; 652 } 653 ip6 = mtod(m, struct ip6_hdr *); 654 655 /* 656 * perform sanity check against inner src/dst. 657 * for source, perform ingress filter as well. 658 */ 659 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 660 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 661 m_freem(m); 662 return; 663 } 664 665 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 666 if ((ifp->if_flags & IFF_LINK1) != 0) 667 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 668 ip6->ip6_flow &= ~htonl(0xff << 20); 669 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 670 671 m->m_pkthdr.rcvif = ifp; 672 673 #if NBPFILTER > 0 674 if (ifp->if_bpf) { 675 /* 676 * We need to prepend the address family as 677 * a four byte field. Cons up a dummy header 678 * to pacify bpf. This is safe because bpf 679 * will only read from the mbuf (i.e., it won't 680 * try to free it or keep a pointer a to it). 681 */ 682 struct mbuf m0; 683 u_int af = AF_INET6; 684 685 m0.m_next = m; 686 m0.m_len = 4; 687 m0.m_data = (char *)⁡ 688 689 #ifdef HAVE_OLD_BPF 690 bpf_mtap(ifp, &m0); 691 #else 692 bpf_mtap(ifp->if_bpf, &m0); 693 #endif 694 } 695 #endif /*NBPFILTER > 0*/ 696 697 /* 698 * Put the packet to the network layer input queue according to the 699 * specified address family. 700 * See net/if_gif.c for possible issues with packet processing 701 * reorder due to extra queueing. 702 */ 703 ifq = &ip6intrq; 704 isr = NETISR_IPV6; 705 706 s = splimp(); 707 if (IF_QFULL(ifq)) { 708 IF_DROP(ifq); /* update statistics */ 709 m_freem(m); 710 splx(s); 711 return; 712 } 713 IF_ENQUEUE(ifq, m); 714 schednetisr(isr); 715 ifp->if_ipackets++; 716 ifp->if_ibytes += m->m_pkthdr.len; 717 splx(s); 718 } 719 720 /* ARGSUSED */ 721 static void 722 stf_rtrequest(cmd, rt, sa) 723 int cmd; 724 struct rtentry *rt; 725 #if defined(__bsdi__) && _BSDI_VERSION >= 199802 726 struct rt_addrinfo *sa; 727 #else 728 struct sockaddr *sa; 729 #endif 730 { 731 732 if (rt) 733 rt->rt_rmx.rmx_mtu = IPV6_MMTU; 734 } 735 736 static int 737 stf_ioctl(ifp, cmd, data) 738 struct ifnet *ifp; 739 #if defined(__FreeBSD__) && __FreeBSD__ < 3 740 int cmd; 741 #else 742 u_long cmd; 743 #endif 744 caddr_t data; 745 { 746 struct ifaddr *ifa; 747 struct ifreq *ifr; 748 struct sockaddr_in6 *sin6; 749 int error; 750 751 error = 0; 752 switch (cmd) { 753 case SIOCSIFADDR: 754 ifa = (struct ifaddr *)data; 755 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 756 error = EAFNOSUPPORT; 757 break; 758 } 759 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 760 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) { 761 ifa->ifa_rtrequest = stf_rtrequest; 762 ifp->if_flags |= IFF_UP; 763 } else 764 error = EINVAL; 765 break; 766 767 case SIOCADDMULTI: 768 case SIOCDELMULTI: 769 ifr = (struct ifreq *)data; 770 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 771 ; 772 else 773 error = EAFNOSUPPORT; 774 break; 775 776 default: 777 error = EINVAL; 778 break; 779 } 780 781 return error; 782 } 783 784 #endif /* NSTF > 0 */ 785
Indexes created Tue Oct 14 11:09:46 GMT 2025