if_stf.c revision 1.10
1 /* $NetBSD: if_stf.c,v 1.10 2001/01/22 07:51:01 itojun Exp $ */ 2 /* $KAME: if_stf.c,v 1.51 2001/01/22 07:27:16 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 > 0 147 148 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 149 #define GET_V4(x) ((struct in_addr *)(&(x)->s6_addr16[1])) 150 151 struct stf_softc { 152 struct ifnet sc_if; /* common area */ 153 union { 154 struct route __sc_ro4; 155 struct route_in6 __sc_ro6; /* just for safety */ 156 } __sc_ro46; 157 #define sc_ro __sc_ro46.__sc_ro4 158 const struct encaptab *encap_cookie; 159 LIST_ENTRY(stf_softc) sc_list; 160 }; 161 162 LIST_HEAD(, stf_softc) stf_softc_list; 163 164 int stf_clone_create __P((struct if_clone *, int)); 165 void stf_clone_destroy __P((struct ifnet *)); 166 167 struct if_clone stf_cloner = 168 IF_CLONE_INITIALIZER("stf", stf_clone_create, stf_clone_destroy); 169 170 #if NGIF > 0 171 extern int ip_gif_ttl; /*XXX*/ 172 #else 173 static int ip_gif_ttl = 40; /*XXX*/ 174 #endif 175 176 extern struct protosw in_stf_protosw; 177 178 #ifdef __FreeBSD__ 179 void stfattach __P((void *)); 180 #else 181 void stfattach __P((int)); 182 #endif 183 static int stf_encapcheck __P((const struct mbuf *, int, int, void *)); 184 static struct in6_ifaddr *stf_getsrcifa6 __P((struct ifnet *)); 185 static int stf_output __P((struct ifnet *, struct mbuf *, struct sockaddr *, 186 struct rtentry *)); 187 static int stf_checkaddr4 __P((struct stf_softc *, struct in_addr *, 188 struct ifnet *)); 189 static int stf_checkaddr6 __P((struct stf_softc *, struct in6_addr *, 190 struct ifnet *)); 191 static void stf_rtrequest __P((int, struct rtentry *, struct rt_addrinfo *)); 192 #if defined(__FreeBSD__) && __FreeBSD__ < 3 193 static int stf_ioctl __P((struct ifnet *, int, caddr_t)); 194 #else 195 static int stf_ioctl __P((struct ifnet *, u_long, caddr_t)); 196 #endif 197 198 /* ARGSUSED */ 199 void 200 stfattach(count) 201 int count; 202 { 203 204 LIST_INIT(&stf_softc_list); 205 if_clone_attach(&stf_cloner); 206 } 207 208 int 209 stf_clone_create(ifc, unit) 210 struct if_clone *ifc; 211 int unit; 212 { 213 struct stf_softc *sc; 214 215 if (LIST_FIRST(&stf_softc_list) != NULL) { 216 /* Only one stf interface is allowed. */ 217 return (EEXIST); 218 } 219 220 sc = malloc(sizeof(struct stf_softc), M_DEVBUF, M_WAIT); 221 bzero(sc, sizeof(struct stf_softc)); 222 223 sprintf(sc->sc_if.if_xname, "%s%d", ifc->ifc_name, unit); 224 225 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 226 stf_encapcheck, &in_stf_protosw, sc); 227 if (sc->encap_cookie == NULL) { 228 printf("%s: unable to attach encap\n", if_name(&sc->sc_if)); 229 free(sc, M_DEVBUF); 230 return (EIO); /* XXX */ 231 } 232 233 sc->sc_if.if_mtu = IPV6_MMTU; 234 sc->sc_if.if_flags = 0; 235 sc->sc_if.if_ioctl = stf_ioctl; 236 sc->sc_if.if_output = stf_output; 237 sc->sc_if.if_type = IFT_STF; 238 sc->sc_if.if_dlt = DLT_NULL; 239 #if defined(__FreeBSD__) && __FreeBSD__ >= 4 240 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN; 241 #endif 242 if_attach(&sc->sc_if); 243 if_alloc_sadl(&sc->sc_if); 244 #if NBPFILTER > 0 245 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 246 #endif 247 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 248 return (0); 249 } 250 251 void 252 stf_clone_destroy(ifp) 253 struct ifnet *ifp; 254 { 255 struct stf_softc *sc = (void *) ifp; 256 257 LIST_REMOVE(sc, sc_list); 258 encap_detach(sc->encap_cookie); 259 #if NBPFILTER > 0 260 bpfdetach(ifp); 261 #endif 262 if_detach(ifp); 263 free(sc, M_DEVBUF); 264 } 265 266 #ifdef __FreeBSD__ 267 PSEUDO_SET(stfattach, if_stf); 268 #endif 269 270 static int 271 stf_encapcheck(m, off, proto, arg) 272 const struct mbuf *m; 273 int off; 274 int proto; 275 void *arg; 276 { 277 struct ip ip; 278 struct in6_ifaddr *ia6; 279 struct stf_softc *sc; 280 struct in_addr a, b; 281 282 sc = (struct stf_softc *)arg; 283 if (sc == NULL) 284 return 0; 285 286 if ((sc->sc_if.if_flags & IFF_UP) == 0) 287 return 0; 288 289 if (proto != IPPROTO_IPV6) 290 return 0; 291 292 /* LINTED const cast */ 293 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); 294 295 if (ip.ip_v != 4) 296 return 0; 297 298 ia6 = stf_getsrcifa6(&sc->sc_if); 299 if (ia6 == NULL) 300 return 0; 301 302 /* 303 * check if IPv4 dst matches the IPv4 address derived from the 304 * local 6to4 address. 305 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 306 */ 307 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 308 sizeof(ip.ip_dst)) != 0) 309 return 0; 310 311 /* 312 * check if IPv4 src matches the IPv4 address derived from the 313 * local 6to4 address masked by prefixmask. 314 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 315 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 316 */ 317 bzero(&a, sizeof(a)); 318 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 319 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 320 b = ip.ip_src; 321 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 322 if (a.s_addr != b.s_addr) 323 return 0; 324 325 /* stf interface makes single side match only */ 326 return 32; 327 } 328 329 static struct in6_ifaddr * 330 stf_getsrcifa6(ifp) 331 struct ifnet *ifp; 332 { 333 struct ifaddr *ia; 334 struct in_ifaddr *ia4; 335 struct sockaddr_in6 *sin6; 336 struct in_addr in; 337 338 #if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3) 339 for (ia = ifp->if_addrlist; ia; ia = ia->ifa_next) 340 #else 341 for (ia = ifp->if_addrlist.tqh_first; 342 ia; 343 ia = ia->ifa_list.tqe_next) 344 #endif 345 { 346 if (ia->ifa_addr == NULL) 347 continue; 348 if (ia->ifa_addr->sa_family != AF_INET6) 349 continue; 350 sin6 = (struct sockaddr_in6 *)ia->ifa_addr; 351 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 352 continue; 353 354 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 355 #ifdef __NetBSD__ 356 INADDR_TO_IA(in, ia4); 357 #else 358 #ifdef __OpenBSD__ 359 for (ia4 = in_ifaddr.tqh_first; 360 ia4; 361 ia4 = ia4->ia_list.tqe_next) 362 #elif defined(__FreeBSD__) && __FreeBSD__ >= 3 363 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 364 ia4; 365 ia4 = TAILQ_NEXT(ia4, ia_link)) 366 #else 367 for (ia4 = in_ifaddr; ia4 != NULL; ia4 = ia4->ia_next) 368 #endif 369 { 370 if (ia4->ia_addr.sin_addr.s_addr == in.s_addr) 371 break; 372 } 373 #endif 374 if (ia4 == NULL) 375 continue; 376 377 return (struct in6_ifaddr *)ia; 378 } 379 380 return NULL; 381 } 382 383 static int 384 stf_output(ifp, m, dst, rt) 385 struct ifnet *ifp; 386 struct mbuf *m; 387 struct sockaddr *dst; 388 struct rtentry *rt; 389 { 390 struct stf_softc *sc; 391 struct sockaddr_in6 *dst6; 392 struct sockaddr_in *dst4; 393 u_int8_t tos; 394 struct ip *ip; 395 struct ip6_hdr *ip6; 396 struct in6_ifaddr *ia6; 397 398 sc = (struct stf_softc*)ifp; 399 dst6 = (struct sockaddr_in6 *)dst; 400 401 /* just in case */ 402 if ((ifp->if_flags & IFF_UP) == 0) { 403 m_freem(m); 404 return ENETDOWN; 405 } 406 407 /* 408 * If we don't have an ip4 address that match my inner ip6 address, 409 * we shouldn't generate output. Without this check, we'll end up 410 * using wrong IPv4 source. 411 */ 412 ia6 = stf_getsrcifa6(ifp); 413 if (ia6 == NULL) { 414 m_freem(m); 415 return ENETDOWN; 416 } 417 418 if (m->m_len < sizeof(*ip6)) { 419 m = m_pullup(m, sizeof(*ip6)); 420 if (!m) 421 return ENOBUFS; 422 } 423 ip6 = mtod(m, struct ip6_hdr *); 424 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 425 426 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 427 if (m && m->m_len < sizeof(struct ip)) 428 m = m_pullup(m, sizeof(struct ip)); 429 if (m == NULL) 430 return ENOBUFS; 431 ip = mtod(m, struct ip *); 432 433 bzero(ip, sizeof(*ip)); 434 435 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 436 &ip->ip_src, sizeof(ip->ip_src)); 437 bcopy(GET_V4(&dst6->sin6_addr), &ip->ip_dst, sizeof(ip->ip_dst)); 438 ip->ip_p = IPPROTO_IPV6; 439 ip->ip_ttl = ip_gif_ttl; /*XXX*/ 440 ip->ip_len = m->m_pkthdr.len; /*host order*/ 441 if (ifp->if_flags & IFF_LINK1) 442 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 443 444 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst; 445 if (dst4->sin_family != AF_INET || 446 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) { 447 /* cache route doesn't match */ 448 dst4->sin_family = AF_INET; 449 dst4->sin_len = sizeof(struct sockaddr_in); 450 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr)); 451 if (sc->sc_ro.ro_rt) { 452 RTFREE(sc->sc_ro.ro_rt); 453 sc->sc_ro.ro_rt = NULL; 454 } 455 } 456 457 if (sc->sc_ro.ro_rt == NULL) { 458 rtalloc(&sc->sc_ro); 459 if (sc->sc_ro.ro_rt == NULL) { 460 m_freem(m); 461 return ENETUNREACH; 462 } 463 } 464 465 #ifndef __OpenBSD__ 466 return ip_output(m, NULL, &sc->sc_ro, 0, NULL); 467 #else 468 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 469 #endif 470 } 471 472 static int 473 stf_checkaddr4(sc, in, inifp) 474 struct stf_softc *sc; 475 struct in_addr *in; 476 struct ifnet *inifp; /* incoming interface */ 477 { 478 struct in_ifaddr *ia4; 479 480 /* 481 * reject packets with the following address: 482 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 483 */ 484 if (IN_MULTICAST(in->s_addr)) 485 return -1; 486 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 487 case 0: case 127: case 255: 488 return -1; 489 } 490 491 /* 492 * reject packets with broadcast 493 */ 494 #if defined(__OpenBSD__) || defined(__NetBSD__) 495 for (ia4 = in_ifaddr.tqh_first; ia4; ia4 = ia4->ia_list.tqe_next) 496 #elif defined(__FreeBSD__) && __FreeBSD__ >= 3 497 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 498 ia4; 499 ia4 = TAILQ_NEXT(ia4, ia_link)) 500 #else 501 for (ia4 = in_ifaddr; ia4 != NULL; ia4 = ia4->ia_next) 502 #endif 503 { 504 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 505 continue; 506 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 507 return -1; 508 } 509 510 /* 511 * perform ingress filter 512 */ 513 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 514 struct sockaddr_in sin; 515 struct rtentry *rt; 516 517 bzero(&sin, sizeof(sin)); 518 sin.sin_family = AF_INET; 519 sin.sin_len = sizeof(struct sockaddr_in); 520 sin.sin_addr = *in; 521 #ifdef __FreeBSD__ 522 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 523 #else 524 rt = rtalloc1((struct sockaddr *)&sin, 0); 525 #endif 526 if (!rt || rt->rt_ifp != inifp) { 527 #if 0 528 log(LOG_WARNING, "%s: packet from 0x%x dropped " 529 "due to ingress filter\n", if_name(&sc->sc_if), 530 (u_int32_t)ntohl(sin.sin_addr.s_addr)); 531 #endif 532 if (rt) 533 rtfree(rt); 534 return -1; 535 } 536 rtfree(rt); 537 } 538 539 return 0; 540 } 541 542 static int 543 stf_checkaddr6(sc, in6, inifp) 544 struct stf_softc *sc; 545 struct in6_addr *in6; 546 struct ifnet *inifp; /* incoming interface */ 547 { 548 /* 549 * check 6to4 addresses 550 */ 551 if (IN6_IS_ADDR_6TO4(in6)) 552 return stf_checkaddr4(sc, GET_V4(in6), inifp); 553 554 /* 555 * reject anything that look suspicious. the test is implemented 556 * in ip6_input too, but we check here as well to 557 * (1) reject bad packets earlier, and 558 * (2) to be safe against future ip6_input change. 559 */ 560 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 561 return -1; 562 563 return 0; 564 } 565 566 void 567 #if __STDC__ 568 in_stf_input(struct mbuf *m, ...) 569 #else 570 in_stf_input(m, va_alist) 571 struct mbuf *m; 572 #endif 573 { 574 int off, proto; 575 struct stf_softc *sc; 576 struct ip *ip; 577 struct ip6_hdr *ip6; 578 u_int8_t otos, itos; 579 int s, isr; 580 struct ifqueue *ifq = NULL; 581 struct ifnet *ifp; 582 va_list ap; 583 584 va_start(ap, m); 585 off = va_arg(ap, int); 586 proto = va_arg(ap, int); 587 va_end(ap); 588 589 if (proto != IPPROTO_IPV6) { 590 m_freem(m); 591 return; 592 } 593 594 ip = mtod(m, struct ip *); 595 596 sc = (struct stf_softc *)encap_getarg(m); 597 598 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 599 m_freem(m); 600 return; 601 } 602 603 ifp = &sc->sc_if; 604 605 /* 606 * perform sanity check against outer src/dst. 607 * for source, perform ingress filter as well. 608 */ 609 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 610 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 611 m_freem(m); 612 return; 613 } 614 615 otos = ip->ip_tos; 616 m_adj(m, off); 617 618 if (m->m_len < sizeof(*ip6)) { 619 m = m_pullup(m, sizeof(*ip6)); 620 if (!m) 621 return; 622 } 623 ip6 = mtod(m, struct ip6_hdr *); 624 625 /* 626 * perform sanity check against inner src/dst. 627 * for source, perform ingress filter as well. 628 */ 629 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 630 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 631 m_freem(m); 632 return; 633 } 634 635 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 636 if ((ifp->if_flags & IFF_LINK1) != 0) 637 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 638 ip6->ip6_flow &= ~htonl(0xff << 20); 639 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 640 641 m->m_pkthdr.rcvif = ifp; 642 643 #if NBPFILTER > 0 644 if (ifp->if_bpf) { 645 /* 646 * We need to prepend the address family as 647 * a four byte field. Cons up a dummy header 648 * to pacify bpf. This is safe because bpf 649 * will only read from the mbuf (i.e., it won't 650 * try to free it or keep a pointer a to it). 651 */ 652 struct mbuf m0; 653 u_int af = AF_INET6; 654 655 m0.m_next = m; 656 m0.m_len = 4; 657 m0.m_data = (char *)⁡ 658 659 #ifdef HAVE_OLD_BPF 660 bpf_mtap(ifp, &m0); 661 #else 662 bpf_mtap(ifp->if_bpf, &m0); 663 #endif 664 } 665 #endif /*NBPFILTER > 0*/ 666 667 /* 668 * Put the packet to the network layer input queue according to the 669 * specified address family. 670 * See net/if_gif.c for possible issues with packet processing 671 * reorder due to extra queueing. 672 */ 673 ifq = &ip6intrq; 674 isr = NETISR_IPV6; 675 676 s = splimp(); 677 if (IF_QFULL(ifq)) { 678 IF_DROP(ifq); /* update statistics */ 679 m_freem(m); 680 splx(s); 681 return; 682 } 683 IF_ENQUEUE(ifq, m); 684 schednetisr(isr); 685 ifp->if_ipackets++; 686 ifp->if_ibytes += m->m_pkthdr.len; 687 splx(s); 688 } 689 690 /* ARGSUSED */ 691 static void 692 stf_rtrequest(cmd, rt, info) 693 int cmd; 694 struct rtentry *rt; 695 struct rt_addrinfo *info; 696 { 697 698 if (rt) 699 rt->rt_rmx.rmx_mtu = IPV6_MMTU; 700 } 701 702 static int 703 stf_ioctl(ifp, cmd, data) 704 struct ifnet *ifp; 705 #if defined(__FreeBSD__) && __FreeBSD__ < 3 706 int cmd; 707 #else 708 u_long cmd; 709 #endif 710 caddr_t data; 711 { 712 struct ifaddr *ifa; 713 struct ifreq *ifr; 714 struct sockaddr_in6 *sin6; 715 int error; 716 717 error = 0; 718 switch (cmd) { 719 case SIOCSIFADDR: 720 ifa = (struct ifaddr *)data; 721 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 722 error = EAFNOSUPPORT; 723 break; 724 } 725 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 726 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) { 727 ifa->ifa_rtrequest = stf_rtrequest; 728 ifp->if_flags |= IFF_UP; 729 } else 730 error = EINVAL; 731 break; 732 733 case SIOCADDMULTI: 734 case SIOCDELMULTI: 735 ifr = (struct ifreq *)data; 736 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 737 ; 738 else 739 error = EAFNOSUPPORT; 740 break; 741 742 default: 743 error = EINVAL; 744 break; 745 } 746 747 return error; 748 } 749 750 #endif /* NSTF > 0 */ 751
Indexes created Tue Sep 30 07:10:03 GMT 2025