if_stf.c revision 1.8
1 /* $NetBSD: if_stf.c,v 1.8 2001/01/17 00:30:52 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 sc->sc_if.if_dlt = DLT_NULL; 241 #if defined(__FreeBSD__) && __FreeBSD__ >= 4 242 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN; 243 #endif 244 if_attach(&sc->sc_if); 245 if_alloc_sadl(&sc->sc_if); 246 #if NBPFILTER > 0 247 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 248 #endif 249 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 250 return (0); 251 } 252 253 void 254 stf_clone_destroy(ifp) 255 struct ifnet *ifp; 256 { 257 struct stf_softc *sc = (void *) ifp; 258 259 LIST_REMOVE(sc, sc_list); 260 encap_detach(sc->encap_cookie); 261 #if NBPFILTER > 0 262 bpfdetach(ifp); 263 #endif 264 if_detach(ifp); 265 free(sc, M_DEVBUF); 266 } 267 268 #ifdef __FreeBSD__ 269 PSEUDO_SET(stfattach, if_stf); 270 #endif 271 272 static int 273 stf_encapcheck(m, off, proto, arg) 274 const struct mbuf *m; 275 int off; 276 int proto; 277 void *arg; 278 { 279 struct ip ip; 280 struct in6_ifaddr *ia6; 281 struct stf_softc *sc; 282 struct in_addr a, b; 283 284 sc = (struct stf_softc *)arg; 285 if (sc == NULL) 286 return 0; 287 288 if ((sc->sc_if.if_flags & IFF_UP) == 0) 289 return 0; 290 291 if (proto != IPPROTO_IPV6) 292 return 0; 293 294 /* LINTED const cast */ 295 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); 296 297 if (ip.ip_v != 4) 298 return 0; 299 300 ia6 = stf_getsrcifa6(&sc->sc_if); 301 if (ia6 == NULL) 302 return 0; 303 304 /* 305 * check if IPv4 dst matches the IPv4 address derived from the 306 * local 6to4 address. 307 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 308 */ 309 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 310 sizeof(ip.ip_dst)) != 0) 311 return 0; 312 313 /* 314 * check if IPv4 src matches the IPv4 address derived from the 315 * local 6to4 address masked by prefixmask. 316 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 317 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 318 */ 319 bzero(&a, sizeof(a)); 320 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 321 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 322 b = ip.ip_src; 323 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 324 if (a.s_addr != b.s_addr) 325 return 0; 326 327 /* stf interface makes single side match only */ 328 return 32; 329 } 330 331 static struct in6_ifaddr * 332 stf_getsrcifa6(ifp) 333 struct ifnet *ifp; 334 { 335 struct ifaddr *ia; 336 struct in_ifaddr *ia4; 337 struct sockaddr_in6 *sin6; 338 struct in_addr in; 339 340 #if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3) 341 for (ia = ifp->if_addrlist; ia; ia = ia->ifa_next) 342 #else 343 for (ia = ifp->if_addrlist.tqh_first; 344 ia; 345 ia = ia->ifa_list.tqe_next) 346 #endif 347 { 348 if (ia->ifa_addr == NULL) 349 continue; 350 if (ia->ifa_addr->sa_family != AF_INET6) 351 continue; 352 sin6 = (struct sockaddr_in6 *)ia->ifa_addr; 353 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 354 continue; 355 356 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 357 #ifdef __NetBSD__ 358 INADDR_TO_IA(in, ia4); 359 #else 360 #ifdef __OpenBSD__ 361 for (ia4 = in_ifaddr.tqh_first; 362 ia4; 363 ia4 = ia4->ia_list.tqe_next) 364 #elif defined(__FreeBSD__) && __FreeBSD__ >= 3 365 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 366 ia4; 367 ia4 = TAILQ_NEXT(ia4, ia_link)) 368 #else 369 for (ia4 = in_ifaddr; ia4 != NULL; ia4 = ia4->ia_next) 370 #endif 371 { 372 if (ia4->ia_addr.sin_addr.s_addr == in.s_addr) 373 break; 374 } 375 #endif 376 if (ia4 == NULL) 377 continue; 378 379 return (struct in6_ifaddr *)ia; 380 } 381 382 return NULL; 383 } 384 385 static int 386 stf_output(ifp, m, dst, rt) 387 struct ifnet *ifp; 388 struct mbuf *m; 389 struct sockaddr *dst; 390 struct rtentry *rt; 391 { 392 struct stf_softc *sc; 393 struct sockaddr_in6 *dst6; 394 struct sockaddr_in *dst4; 395 u_int8_t tos; 396 struct ip *ip; 397 struct ip6_hdr *ip6; 398 struct in6_ifaddr *ia6; 399 400 sc = (struct stf_softc*)ifp; 401 dst6 = (struct sockaddr_in6 *)dst; 402 403 /* just in case */ 404 if ((ifp->if_flags & IFF_UP) == 0) { 405 m_freem(m); 406 return ENETDOWN; 407 } 408 409 /* 410 * If we don't have an ip4 address that match my inner ip6 address, 411 * we shouldn't generate output. Without this check, we'll end up 412 * using wrong IPv4 source. 413 */ 414 ia6 = stf_getsrcifa6(ifp); 415 if (ia6 == NULL) { 416 m_freem(m); 417 return ENETDOWN; 418 } 419 420 if (m->m_len < sizeof(*ip6)) { 421 m = m_pullup(m, sizeof(*ip6)); 422 if (!m) 423 return ENOBUFS; 424 } 425 ip6 = mtod(m, struct ip6_hdr *); 426 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 427 428 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 429 if (m && m->m_len < sizeof(struct ip)) 430 m = m_pullup(m, sizeof(struct ip)); 431 if (m == NULL) 432 return ENOBUFS; 433 ip = mtod(m, struct ip *); 434 435 bzero(ip, sizeof(*ip)); 436 437 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 438 &ip->ip_src, sizeof(ip->ip_src)); 439 bcopy(GET_V4(&dst6->sin6_addr), &ip->ip_dst, sizeof(ip->ip_dst)); 440 ip->ip_p = IPPROTO_IPV6; 441 ip->ip_ttl = ip_gif_ttl; /*XXX*/ 442 ip->ip_len = m->m_pkthdr.len; /*host order*/ 443 if (ifp->if_flags & IFF_LINK1) 444 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 445 446 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst; 447 if (dst4->sin_family != AF_INET || 448 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) { 449 /* cache route doesn't match */ 450 dst4->sin_family = AF_INET; 451 dst4->sin_len = sizeof(struct sockaddr_in); 452 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr)); 453 if (sc->sc_ro.ro_rt) { 454 RTFREE(sc->sc_ro.ro_rt); 455 sc->sc_ro.ro_rt = NULL; 456 } 457 } 458 459 if (sc->sc_ro.ro_rt == NULL) { 460 rtalloc(&sc->sc_ro); 461 if (sc->sc_ro.ro_rt == NULL) { 462 m_freem(m); 463 return ENETUNREACH; 464 } 465 } 466 467 #ifndef __OpenBSD__ 468 return ip_output(m, NULL, &sc->sc_ro, 0, NULL); 469 #else 470 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 471 #endif 472 } 473 474 static int 475 stf_checkaddr4(in, ifp) 476 struct in_addr *in; 477 struct ifnet *ifp; /* incoming interface */ 478 { 479 struct in_ifaddr *ia4; 480 481 /* 482 * reject packets with the following address: 483 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 484 */ 485 if (IN_MULTICAST(in->s_addr)) 486 return -1; 487 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 488 case 0: case 127: case 255: 489 return -1; 490 } 491 492 /* 493 * reject packets with broadcast 494 */ 495 #if defined(__OpenBSD__) || defined(__NetBSD__) 496 for (ia4 = in_ifaddr.tqh_first; ia4; ia4 = ia4->ia_list.tqe_next) 497 #elif defined(__FreeBSD__) && __FreeBSD__ >= 3 498 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 499 ia4; 500 ia4 = TAILQ_NEXT(ia4, ia_link)) 501 #else 502 for (ia4 = in_ifaddr; ia4 != NULL; ia4 = ia4->ia_next) 503 #endif 504 { 505 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 506 continue; 507 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 508 return -1; 509 } 510 511 /* 512 * perform ingress filter 513 */ 514 if (ifp) { 515 struct sockaddr_in sin; 516 struct rtentry *rt; 517 518 bzero(&sin, sizeof(sin)); 519 sin.sin_family = AF_INET; 520 sin.sin_len = sizeof(struct sockaddr_in); 521 sin.sin_addr = *in; 522 #ifdef __FreeBSD__ 523 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 524 #else 525 rt = rtalloc1((struct sockaddr *)&sin, 0); 526 #endif 527 if (!rt) 528 return -1; 529 if (rt->rt_ifp != ifp) { 530 rtfree(rt); 531 return -1; 532 } 533 rtfree(rt); 534 } 535 536 return 0; 537 } 538 539 static int 540 stf_checkaddr6(in6, ifp) 541 struct in6_addr *in6; 542 struct ifnet *ifp; /* incoming interface */ 543 { 544 /* 545 * check 6to4 addresses 546 */ 547 if (IN6_IS_ADDR_6TO4(in6)) 548 return stf_checkaddr4(GET_V4(in6), ifp); 549 550 /* 551 * reject anything that look suspicious. the test is implemented 552 * in ip6_input too, but we check here as well to 553 * (1) reject bad packets earlier, and 554 * (2) to be safe against future ip6_input change. 555 */ 556 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 557 return -1; 558 559 return 0; 560 } 561 562 void 563 #if __STDC__ 564 in_stf_input(struct mbuf *m, ...) 565 #else 566 in_stf_input(m, va_alist) 567 register struct mbuf *m; 568 #endif 569 { 570 int off, proto; 571 struct stf_softc *sc; 572 struct ip *ip; 573 struct ip6_hdr *ip6; 574 u_int8_t otos, itos; 575 int s, isr; 576 struct ifqueue *ifq = NULL; 577 struct ifnet *ifp; 578 va_list ap; 579 580 va_start(ap, m); 581 off = va_arg(ap, int); 582 proto = va_arg(ap, int); 583 va_end(ap); 584 585 if (proto != IPPROTO_IPV6) { 586 m_freem(m); 587 return; 588 } 589 590 ip = mtod(m, struct ip *); 591 592 sc = (struct stf_softc *)encap_getarg(m); 593 594 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 595 m_freem(m); 596 return; 597 } 598 599 ifp = &sc->sc_if; 600 601 /* 602 * perform sanity check against outer src/dst. 603 * for source, perform ingress filter as well. 604 */ 605 if (stf_checkaddr4(&ip->ip_dst, NULL) < 0 || 606 stf_checkaddr4(&ip->ip_src, m->m_pkthdr.rcvif) < 0) { 607 m_freem(m); 608 return; 609 } 610 611 otos = ip->ip_tos; 612 m_adj(m, off); 613 614 if (m->m_len < sizeof(*ip6)) { 615 m = m_pullup(m, sizeof(*ip6)); 616 if (!m) 617 return; 618 } 619 ip6 = mtod(m, struct ip6_hdr *); 620 621 /* 622 * perform sanity check against inner src/dst. 623 * for source, perform ingress filter as well. 624 */ 625 if (stf_checkaddr6(&ip6->ip6_dst, NULL) < 0 || 626 stf_checkaddr6(&ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 627 m_freem(m); 628 return; 629 } 630 631 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 632 if ((ifp->if_flags & IFF_LINK1) != 0) 633 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 634 ip6->ip6_flow &= ~htonl(0xff << 20); 635 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 636 637 m->m_pkthdr.rcvif = ifp; 638 639 #if NBPFILTER > 0 640 if (ifp->if_bpf) { 641 /* 642 * We need to prepend the address family as 643 * a four byte field. Cons up a dummy header 644 * to pacify bpf. This is safe because bpf 645 * will only read from the mbuf (i.e., it won't 646 * try to free it or keep a pointer a to it). 647 */ 648 struct mbuf m0; 649 u_int af = AF_INET6; 650 651 m0.m_next = m; 652 m0.m_len = 4; 653 m0.m_data = (char *)⁡ 654 655 #ifdef HAVE_OLD_BPF 656 bpf_mtap(ifp, &m0); 657 #else 658 bpf_mtap(ifp->if_bpf, &m0); 659 #endif 660 } 661 #endif /*NBPFILTER > 0*/ 662 663 /* 664 * Put the packet to the network layer input queue according to the 665 * specified address family. 666 * See net/if_gif.c for possible issues with packet processing 667 * reorder due to extra queueing. 668 */ 669 ifq = &ip6intrq; 670 isr = NETISR_IPV6; 671 672 s = splimp(); 673 if (IF_QFULL(ifq)) { 674 IF_DROP(ifq); /* update statistics */ 675 m_freem(m); 676 splx(s); 677 return; 678 } 679 IF_ENQUEUE(ifq, m); 680 schednetisr(isr); 681 ifp->if_ipackets++; 682 ifp->if_ibytes += m->m_pkthdr.len; 683 splx(s); 684 } 685 686 /* ARGSUSED */ 687 static void 688 stf_rtrequest(cmd, rt, sa) 689 int cmd; 690 struct rtentry *rt; 691 #if defined(__bsdi__) && _BSDI_VERSION >= 199802 692 struct rt_addrinfo *sa; 693 #else 694 struct sockaddr *sa; 695 #endif 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 Mon Sep 29 21:09:56 GMT 2025