if_stf.c revision 1.6
1 /* $NetBSD: if_stf.c,v 1.6 2000/12/12 18:00:27 thorpej 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 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 in_addr *, struct ifnet *)); 188 static int stf_checkaddr6 __P((struct in6_addr *, struct ifnet *)); 189 #if defined(__bsdi__) && _BSDI_VERSION >= 199802 190 static void stf_rtrequest __P((int, struct rtentry *, struct rt_addrinfo *)); 191 #else 192 static void stf_rtrequest __P((int, struct rtentry *, struct sockaddr *)); 193 #endif 194 #if defined(__FreeBSD__) && __FreeBSD__ < 3 195 static int stf_ioctl __P((struct ifnet *, int, caddr_t)); 196 #else 197 static int stf_ioctl __P((struct ifnet *, u_long, caddr_t)); 198 #endif 199 200 /* ARGSUSED */ 201 void 202 stfattach(count) 203 int count; 204 { 205 206 LIST_INIT(&stf_softc_list); 207 if_clone_attach(&stf_cloner); 208 } 209 210 int 211 stf_clone_create(ifc, unit) 212 struct if_clone *ifc; 213 int unit; 214 { 215 struct stf_softc *sc; 216 217 if (LIST_FIRST(&stf_softc_list) != NULL) { 218 /* Only one stf interface is allowed. */ 219 return (EEXIST); 220 } 221 222 sc = malloc(sizeof(struct stf_softc), M_DEVBUF, M_WAIT); 223 bzero(sc, sizeof(struct stf_softc)); 224 225 sprintf(sc->sc_if.if_xname, "%s%d", ifc->ifc_name, unit); 226 227 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 228 stf_encapcheck, &in_stf_protosw, sc); 229 if (sc->encap_cookie == NULL) { 230 printf("%s: unable to attach encap\n", if_name(&sc->sc_if)); 231 free(sc, M_DEVBUF); 232 return (EIO); /* XXX */ 233 } 234 235 sc->sc_if.if_mtu = IPV6_MMTU; 236 sc->sc_if.if_flags = 0; 237 sc->sc_if.if_ioctl = stf_ioctl; 238 sc->sc_if.if_output = stf_output; 239 sc->sc_if.if_type = IFT_STF; 240 #if defined(__FreeBSD__) && __FreeBSD__ >= 4 241 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN; 242 #endif 243 if_attach(&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(in, ifp) 474 struct in_addr *in; 475 struct ifnet *ifp; /* incoming interface */ 476 { 477 struct in_ifaddr *ia4; 478 479 /* 480 * reject packets with the following address: 481 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 482 */ 483 if (IN_MULTICAST(in->s_addr)) 484 return -1; 485 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 486 case 0: case 127: case 255: 487 return -1; 488 } 489 490 /* 491 * reject packets with broadcast 492 */ 493 #if defined(__OpenBSD__) || defined(__NetBSD__) 494 for (ia4 = in_ifaddr.tqh_first; ia4; ia4 = ia4->ia_list.tqe_next) 495 #elif defined(__FreeBSD__) && __FreeBSD__ >= 3 496 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 497 ia4; 498 ia4 = TAILQ_NEXT(ia4, ia_link)) 499 #else 500 for (ia4 = in_ifaddr; ia4 != NULL; ia4 = ia4->ia_next) 501 #endif 502 { 503 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 504 continue; 505 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 506 return -1; 507 } 508 509 /* 510 * perform ingress filter 511 */ 512 if (ifp) { 513 struct sockaddr_in sin; 514 struct rtentry *rt; 515 516 bzero(&sin, sizeof(sin)); 517 sin.sin_family = AF_INET; 518 sin.sin_len = sizeof(struct sockaddr_in); 519 sin.sin_addr = *in; 520 #ifdef __FreeBSD__ 521 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 522 #else 523 rt = rtalloc1((struct sockaddr *)&sin, 0); 524 #endif 525 if (!rt) 526 return -1; 527 if (rt->rt_ifp != ifp) { 528 rtfree(rt); 529 return -1; 530 } 531 rtfree(rt); 532 } 533 534 return 0; 535 } 536 537 static int 538 stf_checkaddr6(in6, ifp) 539 struct in6_addr *in6; 540 struct ifnet *ifp; /* incoming interface */ 541 { 542 /* 543 * check 6to4 addresses 544 */ 545 if (IN6_IS_ADDR_6TO4(in6)) 546 return stf_checkaddr4(GET_V4(in6), ifp); 547 548 /* 549 * reject anything that look suspicious. the test is implemented 550 * in ip6_input too, but we check here as well to 551 * (1) reject bad packets earlier, and 552 * (2) to be safe against future ip6_input change. 553 */ 554 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 555 return -1; 556 557 return 0; 558 } 559 560 void 561 #if __STDC__ 562 in_stf_input(struct mbuf *m, ...) 563 #else 564 in_stf_input(m, va_alist) 565 register struct mbuf *m; 566 #endif 567 { 568 int off, proto; 569 struct stf_softc *sc; 570 struct ip *ip; 571 struct ip6_hdr *ip6; 572 u_int8_t otos, itos; 573 int s, isr; 574 struct ifqueue *ifq = NULL; 575 struct ifnet *ifp; 576 va_list ap; 577 578 va_start(ap, m); 579 off = va_arg(ap, int); 580 proto = va_arg(ap, int); 581 va_end(ap); 582 583 if (proto != IPPROTO_IPV6) { 584 m_freem(m); 585 return; 586 } 587 588 ip = mtod(m, struct ip *); 589 590 sc = (struct stf_softc *)encap_getarg(m); 591 592 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 593 m_freem(m); 594 return; 595 } 596 597 ifp = &sc->sc_if; 598 599 /* 600 * perform sanity check against outer src/dst. 601 * for source, perform ingress filter as well. 602 */ 603 if (stf_checkaddr4(&ip->ip_dst, NULL) < 0 || 604 stf_checkaddr4(&ip->ip_src, m->m_pkthdr.rcvif) < 0) { 605 m_freem(m); 606 return; 607 } 608 609 otos = ip->ip_tos; 610 m_adj(m, off); 611 612 if (m->m_len < sizeof(*ip6)) { 613 m = m_pullup(m, sizeof(*ip6)); 614 if (!m) 615 return; 616 } 617 ip6 = mtod(m, struct ip6_hdr *); 618 619 /* 620 * perform sanity check against inner src/dst. 621 * for source, perform ingress filter as well. 622 */ 623 if (stf_checkaddr6(&ip6->ip6_dst, NULL) < 0 || 624 stf_checkaddr6(&ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 625 m_freem(m); 626 return; 627 } 628 629 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 630 if ((ifp->if_flags & IFF_LINK1) != 0) 631 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 632 ip6->ip6_flow &= ~htonl(0xff << 20); 633 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 634 635 m->m_pkthdr.rcvif = ifp; 636 637 #if NBPFILTER > 0 638 if (ifp->if_bpf) { 639 /* 640 * We need to prepend the address family as 641 * a four byte field. Cons up a dummy header 642 * to pacify bpf. This is safe because bpf 643 * will only read from the mbuf (i.e., it won't 644 * try to free it or keep a pointer a to it). 645 */ 646 struct mbuf m0; 647 u_int af = AF_INET6; 648 649 m0.m_next = m; 650 m0.m_len = 4; 651 m0.m_data = (char *)⁡ 652 653 #ifdef HAVE_OLD_BPF 654 bpf_mtap(ifp, &m0); 655 #else 656 bpf_mtap(ifp->if_bpf, &m0); 657 #endif 658 } 659 #endif /*NBPFILTER > 0*/ 660 661 /* 662 * Put the packet to the network layer input queue according to the 663 * specified address family. 664 * See net/if_gif.c for possible issues with packet processing 665 * reorder due to extra queueing. 666 */ 667 ifq = &ip6intrq; 668 isr = NETISR_IPV6; 669 670 s = splimp(); 671 if (IF_QFULL(ifq)) { 672 IF_DROP(ifq); /* update statistics */ 673 m_freem(m); 674 splx(s); 675 return; 676 } 677 IF_ENQUEUE(ifq, m); 678 schednetisr(isr); 679 ifp->if_ipackets++; 680 ifp->if_ibytes += m->m_pkthdr.len; 681 splx(s); 682 } 683 684 /* ARGSUSED */ 685 static void 686 stf_rtrequest(cmd, rt, sa) 687 int cmd; 688 struct rtentry *rt; 689 #if defined(__bsdi__) && _BSDI_VERSION >= 199802 690 struct rt_addrinfo *sa; 691 #else 692 struct sockaddr *sa; 693 #endif 694 { 695 696 if (rt) 697 rt->rt_rmx.rmx_mtu = IPV6_MMTU; 698 } 699 700 static int 701 stf_ioctl(ifp, cmd, data) 702 struct ifnet *ifp; 703 #if defined(__FreeBSD__) && __FreeBSD__ < 3 704 int cmd; 705 #else 706 u_long cmd; 707 #endif 708 caddr_t data; 709 { 710 struct ifaddr *ifa; 711 struct ifreq *ifr; 712 struct sockaddr_in6 *sin6; 713 int error; 714 715 error = 0; 716 switch (cmd) { 717 case SIOCSIFADDR: 718 ifa = (struct ifaddr *)data; 719 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 720 error = EAFNOSUPPORT; 721 break; 722 } 723 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 724 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) { 725 ifa->ifa_rtrequest = stf_rtrequest; 726 ifp->if_flags |= IFF_UP; 727 } else 728 error = EINVAL; 729 break; 730 731 case SIOCADDMULTI: 732 case SIOCDELMULTI: 733 ifr = (struct ifreq *)data; 734 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 735 ; 736 else 737 error = EAFNOSUPPORT; 738 break; 739 740 default: 741 error = EINVAL; 742 break; 743 } 744 745 return error; 746 } 747 748 #endif /* NSTF > 0 */ 749
Indexes created Mon Oct 13 21:09:55 GMT 2025