if_stf.c revision 1.9
1 /* $NetBSD: if_stf.c,v 1.9 2001/01/17 04:05:42 itojun 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 static void stf_rtrequest __P((int, struct rtentry *, struct rt_addrinfo *)); 190 #if defined(__FreeBSD__) && __FreeBSD__ < 3 191 static int stf_ioctl __P((struct ifnet *, int, caddr_t)); 192 #else 193 static int stf_ioctl __P((struct ifnet *, u_long, caddr_t)); 194 #endif 195 196 /* ARGSUSED */ 197 void 198 stfattach(count) 199 int count; 200 { 201 202 LIST_INIT(&stf_softc_list); 203 if_clone_attach(&stf_cloner); 204 } 205 206 int 207 stf_clone_create(ifc, unit) 208 struct if_clone *ifc; 209 int unit; 210 { 211 struct stf_softc *sc; 212 213 if (LIST_FIRST(&stf_softc_list) != NULL) { 214 /* Only one stf interface is allowed. */ 215 return (EEXIST); 216 } 217 218 sc = malloc(sizeof(struct stf_softc), M_DEVBUF, M_WAIT); 219 bzero(sc, sizeof(struct stf_softc)); 220 221 sprintf(sc->sc_if.if_xname, "%s%d", ifc->ifc_name, unit); 222 223 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 224 stf_encapcheck, &in_stf_protosw, sc); 225 if (sc->encap_cookie == NULL) { 226 printf("%s: unable to attach encap\n", if_name(&sc->sc_if)); 227 free(sc, M_DEVBUF); 228 return (EIO); /* XXX */ 229 } 230 231 sc->sc_if.if_mtu = IPV6_MMTU; 232 sc->sc_if.if_flags = 0; 233 sc->sc_if.if_ioctl = stf_ioctl; 234 sc->sc_if.if_output = stf_output; 235 sc->sc_if.if_type = IFT_STF; 236 sc->sc_if.if_dlt = DLT_NULL; 237 #if defined(__FreeBSD__) && __FreeBSD__ >= 4 238 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN; 239 #endif 240 if_attach(&sc->sc_if); 241 if_alloc_sadl(&sc->sc_if); 242 #if NBPFILTER > 0 243 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 244 #endif 245 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 246 return (0); 247 } 248 249 void 250 stf_clone_destroy(ifp) 251 struct ifnet *ifp; 252 { 253 struct stf_softc *sc = (void *) ifp; 254 255 LIST_REMOVE(sc, sc_list); 256 encap_detach(sc->encap_cookie); 257 #if NBPFILTER > 0 258 bpfdetach(ifp); 259 #endif 260 if_detach(ifp); 261 free(sc, M_DEVBUF); 262 } 263 264 #ifdef __FreeBSD__ 265 PSEUDO_SET(stfattach, if_stf); 266 #endif 267 268 static int 269 stf_encapcheck(m, off, proto, arg) 270 const struct mbuf *m; 271 int off; 272 int proto; 273 void *arg; 274 { 275 struct ip ip; 276 struct in6_ifaddr *ia6; 277 struct stf_softc *sc; 278 struct in_addr a, b; 279 280 sc = (struct stf_softc *)arg; 281 if (sc == NULL) 282 return 0; 283 284 if ((sc->sc_if.if_flags & IFF_UP) == 0) 285 return 0; 286 287 if (proto != IPPROTO_IPV6) 288 return 0; 289 290 /* LINTED const cast */ 291 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); 292 293 if (ip.ip_v != 4) 294 return 0; 295 296 ia6 = stf_getsrcifa6(&sc->sc_if); 297 if (ia6 == NULL) 298 return 0; 299 300 /* 301 * check if IPv4 dst matches the IPv4 address derived from the 302 * local 6to4 address. 303 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 304 */ 305 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 306 sizeof(ip.ip_dst)) != 0) 307 return 0; 308 309 /* 310 * check if IPv4 src matches the IPv4 address derived from the 311 * local 6to4 address masked by prefixmask. 312 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 313 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 314 */ 315 bzero(&a, sizeof(a)); 316 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 317 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 318 b = ip.ip_src; 319 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 320 if (a.s_addr != b.s_addr) 321 return 0; 322 323 /* stf interface makes single side match only */ 324 return 32; 325 } 326 327 static struct in6_ifaddr * 328 stf_getsrcifa6(ifp) 329 struct ifnet *ifp; 330 { 331 struct ifaddr *ia; 332 struct in_ifaddr *ia4; 333 struct sockaddr_in6 *sin6; 334 struct in_addr in; 335 336 #if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3) 337 for (ia = ifp->if_addrlist; ia; ia = ia->ifa_next) 338 #else 339 for (ia = ifp->if_addrlist.tqh_first; 340 ia; 341 ia = ia->ifa_list.tqe_next) 342 #endif 343 { 344 if (ia->ifa_addr == NULL) 345 continue; 346 if (ia->ifa_addr->sa_family != AF_INET6) 347 continue; 348 sin6 = (struct sockaddr_in6 *)ia->ifa_addr; 349 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 350 continue; 351 352 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 353 #ifdef __NetBSD__ 354 INADDR_TO_IA(in, ia4); 355 #else 356 #ifdef __OpenBSD__ 357 for (ia4 = in_ifaddr.tqh_first; 358 ia4; 359 ia4 = ia4->ia_list.tqe_next) 360 #elif defined(__FreeBSD__) && __FreeBSD__ >= 3 361 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 362 ia4; 363 ia4 = TAILQ_NEXT(ia4, ia_link)) 364 #else 365 for (ia4 = in_ifaddr; ia4 != NULL; ia4 = ia4->ia_next) 366 #endif 367 { 368 if (ia4->ia_addr.sin_addr.s_addr == in.s_addr) 369 break; 370 } 371 #endif 372 if (ia4 == NULL) 373 continue; 374 375 return (struct in6_ifaddr *)ia; 376 } 377 378 return NULL; 379 } 380 381 static int 382 stf_output(ifp, m, dst, rt) 383 struct ifnet *ifp; 384 struct mbuf *m; 385 struct sockaddr *dst; 386 struct rtentry *rt; 387 { 388 struct stf_softc *sc; 389 struct sockaddr_in6 *dst6; 390 struct sockaddr_in *dst4; 391 u_int8_t tos; 392 struct ip *ip; 393 struct ip6_hdr *ip6; 394 struct in6_ifaddr *ia6; 395 396 sc = (struct stf_softc*)ifp; 397 dst6 = (struct sockaddr_in6 *)dst; 398 399 /* just in case */ 400 if ((ifp->if_flags & IFF_UP) == 0) { 401 m_freem(m); 402 return ENETDOWN; 403 } 404 405 /* 406 * If we don't have an ip4 address that match my inner ip6 address, 407 * we shouldn't generate output. Without this check, we'll end up 408 * using wrong IPv4 source. 409 */ 410 ia6 = stf_getsrcifa6(ifp); 411 if (ia6 == NULL) { 412 m_freem(m); 413 return ENETDOWN; 414 } 415 416 if (m->m_len < sizeof(*ip6)) { 417 m = m_pullup(m, sizeof(*ip6)); 418 if (!m) 419 return ENOBUFS; 420 } 421 ip6 = mtod(m, struct ip6_hdr *); 422 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 423 424 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 425 if (m && m->m_len < sizeof(struct ip)) 426 m = m_pullup(m, sizeof(struct ip)); 427 if (m == NULL) 428 return ENOBUFS; 429 ip = mtod(m, struct ip *); 430 431 bzero(ip, sizeof(*ip)); 432 433 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 434 &ip->ip_src, sizeof(ip->ip_src)); 435 bcopy(GET_V4(&dst6->sin6_addr), &ip->ip_dst, sizeof(ip->ip_dst)); 436 ip->ip_p = IPPROTO_IPV6; 437 ip->ip_ttl = ip_gif_ttl; /*XXX*/ 438 ip->ip_len = m->m_pkthdr.len; /*host order*/ 439 if (ifp->if_flags & IFF_LINK1) 440 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 441 442 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst; 443 if (dst4->sin_family != AF_INET || 444 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) { 445 /* cache route doesn't match */ 446 dst4->sin_family = AF_INET; 447 dst4->sin_len = sizeof(struct sockaddr_in); 448 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr)); 449 if (sc->sc_ro.ro_rt) { 450 RTFREE(sc->sc_ro.ro_rt); 451 sc->sc_ro.ro_rt = NULL; 452 } 453 } 454 455 if (sc->sc_ro.ro_rt == NULL) { 456 rtalloc(&sc->sc_ro); 457 if (sc->sc_ro.ro_rt == NULL) { 458 m_freem(m); 459 return ENETUNREACH; 460 } 461 } 462 463 #ifndef __OpenBSD__ 464 return ip_output(m, NULL, &sc->sc_ro, 0, NULL); 465 #else 466 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 467 #endif 468 } 469 470 static int 471 stf_checkaddr4(in, ifp) 472 struct in_addr *in; 473 struct ifnet *ifp; /* incoming interface */ 474 { 475 struct in_ifaddr *ia4; 476 477 /* 478 * reject packets with the following address: 479 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 480 */ 481 if (IN_MULTICAST(in->s_addr)) 482 return -1; 483 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 484 case 0: case 127: case 255: 485 return -1; 486 } 487 488 /* 489 * reject packets with broadcast 490 */ 491 #if defined(__OpenBSD__) || defined(__NetBSD__) 492 for (ia4 = in_ifaddr.tqh_first; ia4; ia4 = ia4->ia_list.tqe_next) 493 #elif defined(__FreeBSD__) && __FreeBSD__ >= 3 494 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 495 ia4; 496 ia4 = TAILQ_NEXT(ia4, ia_link)) 497 #else 498 for (ia4 = in_ifaddr; ia4 != NULL; ia4 = ia4->ia_next) 499 #endif 500 { 501 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 502 continue; 503 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 504 return -1; 505 } 506 507 /* 508 * perform ingress filter 509 */ 510 if (ifp) { 511 struct sockaddr_in sin; 512 struct rtentry *rt; 513 514 bzero(&sin, sizeof(sin)); 515 sin.sin_family = AF_INET; 516 sin.sin_len = sizeof(struct sockaddr_in); 517 sin.sin_addr = *in; 518 #ifdef __FreeBSD__ 519 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 520 #else 521 rt = rtalloc1((struct sockaddr *)&sin, 0); 522 #endif 523 if (!rt) 524 return -1; 525 if (rt->rt_ifp != ifp) { 526 rtfree(rt); 527 return -1; 528 } 529 rtfree(rt); 530 } 531 532 return 0; 533 } 534 535 static int 536 stf_checkaddr6(in6, ifp) 537 struct in6_addr *in6; 538 struct ifnet *ifp; /* incoming interface */ 539 { 540 /* 541 * check 6to4 addresses 542 */ 543 if (IN6_IS_ADDR_6TO4(in6)) 544 return stf_checkaddr4(GET_V4(in6), ifp); 545 546 /* 547 * reject anything that look suspicious. the test is implemented 548 * in ip6_input too, but we check here as well to 549 * (1) reject bad packets earlier, and 550 * (2) to be safe against future ip6_input change. 551 */ 552 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 553 return -1; 554 555 return 0; 556 } 557 558 void 559 #if __STDC__ 560 in_stf_input(struct mbuf *m, ...) 561 #else 562 in_stf_input(m, va_alist) 563 register struct mbuf *m; 564 #endif 565 { 566 int off, proto; 567 struct stf_softc *sc; 568 struct ip *ip; 569 struct ip6_hdr *ip6; 570 u_int8_t otos, itos; 571 int s, isr; 572 struct ifqueue *ifq = NULL; 573 struct ifnet *ifp; 574 va_list ap; 575 576 va_start(ap, m); 577 off = va_arg(ap, int); 578 proto = va_arg(ap, int); 579 va_end(ap); 580 581 if (proto != IPPROTO_IPV6) { 582 m_freem(m); 583 return; 584 } 585 586 ip = mtod(m, struct ip *); 587 588 sc = (struct stf_softc *)encap_getarg(m); 589 590 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 591 m_freem(m); 592 return; 593 } 594 595 ifp = &sc->sc_if; 596 597 /* 598 * perform sanity check against outer src/dst. 599 * for source, perform ingress filter as well. 600 */ 601 if (stf_checkaddr4(&ip->ip_dst, NULL) < 0 || 602 stf_checkaddr4(&ip->ip_src, m->m_pkthdr.rcvif) < 0) { 603 m_freem(m); 604 return; 605 } 606 607 otos = ip->ip_tos; 608 m_adj(m, off); 609 610 if (m->m_len < sizeof(*ip6)) { 611 m = m_pullup(m, sizeof(*ip6)); 612 if (!m) 613 return; 614 } 615 ip6 = mtod(m, struct ip6_hdr *); 616 617 /* 618 * perform sanity check against inner src/dst. 619 * for source, perform ingress filter as well. 620 */ 621 if (stf_checkaddr6(&ip6->ip6_dst, NULL) < 0 || 622 stf_checkaddr6(&ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 623 m_freem(m); 624 return; 625 } 626 627 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 628 if ((ifp->if_flags & IFF_LINK1) != 0) 629 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 630 ip6->ip6_flow &= ~htonl(0xff << 20); 631 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 632 633 m->m_pkthdr.rcvif = ifp; 634 635 #if NBPFILTER > 0 636 if (ifp->if_bpf) { 637 /* 638 * We need to prepend the address family as 639 * a four byte field. Cons up a dummy header 640 * to pacify bpf. This is safe because bpf 641 * will only read from the mbuf (i.e., it won't 642 * try to free it or keep a pointer a to it). 643 */ 644 struct mbuf m0; 645 u_int af = AF_INET6; 646 647 m0.m_next = m; 648 m0.m_len = 4; 649 m0.m_data = (char *)⁡ 650 651 #ifdef HAVE_OLD_BPF 652 bpf_mtap(ifp, &m0); 653 #else 654 bpf_mtap(ifp->if_bpf, &m0); 655 #endif 656 } 657 #endif /*NBPFILTER > 0*/ 658 659 /* 660 * Put the packet to the network layer input queue according to the 661 * specified address family. 662 * See net/if_gif.c for possible issues with packet processing 663 * reorder due to extra queueing. 664 */ 665 ifq = &ip6intrq; 666 isr = NETISR_IPV6; 667 668 s = splimp(); 669 if (IF_QFULL(ifq)) { 670 IF_DROP(ifq); /* update statistics */ 671 m_freem(m); 672 splx(s); 673 return; 674 } 675 IF_ENQUEUE(ifq, m); 676 schednetisr(isr); 677 ifp->if_ipackets++; 678 ifp->if_ibytes += m->m_pkthdr.len; 679 splx(s); 680 } 681 682 /* ARGSUSED */ 683 static void 684 stf_rtrequest(cmd, rt, info) 685 int cmd; 686 struct rtentry *rt; 687 struct rt_addrinfo *info; 688 { 689 690 if (rt) 691 rt->rt_rmx.rmx_mtu = IPV6_MMTU; 692 } 693 694 static int 695 stf_ioctl(ifp, cmd, data) 696 struct ifnet *ifp; 697 #if defined(__FreeBSD__) && __FreeBSD__ < 3 698 int cmd; 699 #else 700 u_long cmd; 701 #endif 702 caddr_t data; 703 { 704 struct ifaddr *ifa; 705 struct ifreq *ifr; 706 struct sockaddr_in6 *sin6; 707 int error; 708 709 error = 0; 710 switch (cmd) { 711 case SIOCSIFADDR: 712 ifa = (struct ifaddr *)data; 713 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 714 error = EAFNOSUPPORT; 715 break; 716 } 717 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 718 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) { 719 ifa->ifa_rtrequest = stf_rtrequest; 720 ifp->if_flags |= IFF_UP; 721 } else 722 error = EINVAL; 723 break; 724 725 case SIOCADDMULTI: 726 case SIOCDELMULTI: 727 ifr = (struct ifreq *)data; 728 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 729 ; 730 else 731 error = EAFNOSUPPORT; 732 break; 733 734 default: 735 error = EINVAL; 736 break; 737 } 738 739 return error; 740 } 741 742 #endif /* NSTF > 0 */ 743
Indexes created Tue Sep 30 11:09:46 GMT 2025