if_stf.c revision 1.5
1 /* $NetBSD: if_stf.c,v 1.5 2000/07/05 17:08:18 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 #ifdef HAVE_OLD_BPF 246 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 247 #else 248 bpfattach(&sc->sc_if.if_bpf, &sc->sc_if, DLT_NULL, sizeof(u_int)); 249 #endif 250 #endif 251 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 252 return (0); 253 } 254 255 void 256 stf_clone_destroy(ifp) 257 struct ifnet *ifp; 258 { 259 struct stf_softc *sc = (void *) ifp; 260 261 LIST_REMOVE(sc, sc_list); 262 encap_detach(sc->encap_cookie); 263 #if NBPFILTER > 0 264 bpfdetach(ifp); 265 #endif 266 if_detach(ifp); 267 free(sc, M_DEVBUF); 268 } 269 270 #ifdef __FreeBSD__ 271 PSEUDO_SET(stfattach, if_stf); 272 #endif 273 274 static int 275 stf_encapcheck(m, off, proto, arg) 276 const struct mbuf *m; 277 int off; 278 int proto; 279 void *arg; 280 { 281 struct ip ip; 282 struct in6_ifaddr *ia6; 283 struct stf_softc *sc; 284 struct in_addr a, b; 285 286 sc = (struct stf_softc *)arg; 287 if (sc == NULL) 288 return 0; 289 290 if ((sc->sc_if.if_flags & IFF_UP) == 0) 291 return 0; 292 293 if (proto != IPPROTO_IPV6) 294 return 0; 295 296 /* LINTED const cast */ 297 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); 298 299 if (ip.ip_v != 4) 300 return 0; 301 302 ia6 = stf_getsrcifa6(&sc->sc_if); 303 if (ia6 == NULL) 304 return 0; 305 306 /* 307 * check if IPv4 dst matches the IPv4 address derived from the 308 * local 6to4 address. 309 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 310 */ 311 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 312 sizeof(ip.ip_dst)) != 0) 313 return 0; 314 315 /* 316 * check if IPv4 src matches the IPv4 address derived from the 317 * local 6to4 address masked by prefixmask. 318 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 319 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 320 */ 321 bzero(&a, sizeof(a)); 322 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 323 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 324 b = ip.ip_src; 325 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 326 if (a.s_addr != b.s_addr) 327 return 0; 328 329 /* stf interface makes single side match only */ 330 return 32; 331 } 332 333 static struct in6_ifaddr * 334 stf_getsrcifa6(ifp) 335 struct ifnet *ifp; 336 { 337 struct ifaddr *ia; 338 struct in_ifaddr *ia4; 339 struct sockaddr_in6 *sin6; 340 struct in_addr in; 341 342 #if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3) 343 for (ia = ifp->if_addrlist; ia; ia = ia->ifa_next) 344 #else 345 for (ia = ifp->if_addrlist.tqh_first; 346 ia; 347 ia = ia->ifa_list.tqe_next) 348 #endif 349 { 350 if (ia->ifa_addr == NULL) 351 continue; 352 if (ia->ifa_addr->sa_family != AF_INET6) 353 continue; 354 sin6 = (struct sockaddr_in6 *)ia->ifa_addr; 355 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 356 continue; 357 358 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 359 #ifdef __NetBSD__ 360 INADDR_TO_IA(in, ia4); 361 #else 362 #ifdef __OpenBSD__ 363 for (ia4 = in_ifaddr.tqh_first; 364 ia4; 365 ia4 = ia4->ia_list.tqe_next) 366 #elif defined(__FreeBSD__) && __FreeBSD__ >= 3 367 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 368 ia4; 369 ia4 = TAILQ_NEXT(ia4, ia_link)) 370 #else 371 for (ia4 = in_ifaddr; ia4 != NULL; ia4 = ia4->ia_next) 372 #endif 373 { 374 if (ia4->ia_addr.sin_addr.s_addr == in.s_addr) 375 break; 376 } 377 #endif 378 if (ia4 == NULL) 379 continue; 380 381 return (struct in6_ifaddr *)ia; 382 } 383 384 return NULL; 385 } 386 387 static int 388 stf_output(ifp, m, dst, rt) 389 struct ifnet *ifp; 390 struct mbuf *m; 391 struct sockaddr *dst; 392 struct rtentry *rt; 393 { 394 struct stf_softc *sc; 395 struct sockaddr_in6 *dst6; 396 struct sockaddr_in *dst4; 397 u_int8_t tos; 398 struct ip *ip; 399 struct ip6_hdr *ip6; 400 struct in6_ifaddr *ia6; 401 402 sc = (struct stf_softc*)ifp; 403 dst6 = (struct sockaddr_in6 *)dst; 404 405 /* just in case */ 406 if ((ifp->if_flags & IFF_UP) == 0) { 407 m_freem(m); 408 return ENETDOWN; 409 } 410 411 /* 412 * If we don't have an ip4 address that match my inner ip6 address, 413 * we shouldn't generate output. Without this check, we'll end up 414 * using wrong IPv4 source. 415 */ 416 ia6 = stf_getsrcifa6(ifp); 417 if (ia6 == NULL) { 418 m_freem(m); 419 return ENETDOWN; 420 } 421 422 if (m->m_len < sizeof(*ip6)) { 423 m = m_pullup(m, sizeof(*ip6)); 424 if (!m) 425 return ENOBUFS; 426 } 427 ip6 = mtod(m, struct ip6_hdr *); 428 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 429 430 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 431 if (m && m->m_len < sizeof(struct ip)) 432 m = m_pullup(m, sizeof(struct ip)); 433 if (m == NULL) 434 return ENOBUFS; 435 ip = mtod(m, struct ip *); 436 437 bzero(ip, sizeof(*ip)); 438 439 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 440 &ip->ip_src, sizeof(ip->ip_src)); 441 bcopy(GET_V4(&dst6->sin6_addr), &ip->ip_dst, sizeof(ip->ip_dst)); 442 ip->ip_p = IPPROTO_IPV6; 443 ip->ip_ttl = ip_gif_ttl; /*XXX*/ 444 ip->ip_len = m->m_pkthdr.len; /*host order*/ 445 if (ifp->if_flags & IFF_LINK1) 446 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 447 448 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst; 449 if (dst4->sin_family != AF_INET || 450 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) { 451 /* cache route doesn't match */ 452 dst4->sin_family = AF_INET; 453 dst4->sin_len = sizeof(struct sockaddr_in); 454 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr)); 455 if (sc->sc_ro.ro_rt) { 456 RTFREE(sc->sc_ro.ro_rt); 457 sc->sc_ro.ro_rt = NULL; 458 } 459 } 460 461 if (sc->sc_ro.ro_rt == NULL) { 462 rtalloc(&sc->sc_ro); 463 if (sc->sc_ro.ro_rt == NULL) { 464 m_freem(m); 465 return ENETUNREACH; 466 } 467 } 468 469 #ifndef __OpenBSD__ 470 return ip_output(m, NULL, &sc->sc_ro, 0, NULL); 471 #else 472 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 473 #endif 474 } 475 476 static int 477 stf_checkaddr4(in, ifp) 478 struct in_addr *in; 479 struct ifnet *ifp; /* incoming interface */ 480 { 481 struct in_ifaddr *ia4; 482 483 /* 484 * reject packets with the following address: 485 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 486 */ 487 if (IN_MULTICAST(in->s_addr)) 488 return -1; 489 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 490 case 0: case 127: case 255: 491 return -1; 492 } 493 494 /* 495 * reject packets with broadcast 496 */ 497 #if defined(__OpenBSD__) || defined(__NetBSD__) 498 for (ia4 = in_ifaddr.tqh_first; ia4; ia4 = ia4->ia_list.tqe_next) 499 #elif defined(__FreeBSD__) && __FreeBSD__ >= 3 500 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 501 ia4; 502 ia4 = TAILQ_NEXT(ia4, ia_link)) 503 #else 504 for (ia4 = in_ifaddr; ia4 != NULL; ia4 = ia4->ia_next) 505 #endif 506 { 507 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 508 continue; 509 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 510 return -1; 511 } 512 513 /* 514 * perform ingress filter 515 */ 516 if (ifp) { 517 struct sockaddr_in sin; 518 struct rtentry *rt; 519 520 bzero(&sin, sizeof(sin)); 521 sin.sin_family = AF_INET; 522 sin.sin_len = sizeof(struct sockaddr_in); 523 sin.sin_addr = *in; 524 #ifdef __FreeBSD__ 525 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 526 #else 527 rt = rtalloc1((struct sockaddr *)&sin, 0); 528 #endif 529 if (!rt) 530 return -1; 531 if (rt->rt_ifp != ifp) { 532 rtfree(rt); 533 return -1; 534 } 535 rtfree(rt); 536 } 537 538 return 0; 539 } 540 541 static int 542 stf_checkaddr6(in6, ifp) 543 struct in6_addr *in6; 544 struct ifnet *ifp; /* incoming interface */ 545 { 546 /* 547 * check 6to4 addresses 548 */ 549 if (IN6_IS_ADDR_6TO4(in6)) 550 return stf_checkaddr4(GET_V4(in6), ifp); 551 552 /* 553 * reject anything that look suspicious. the test is implemented 554 * in ip6_input too, but we check here as well to 555 * (1) reject bad packets earlier, and 556 * (2) to be safe against future ip6_input change. 557 */ 558 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 559 return -1; 560 561 return 0; 562 } 563 564 void 565 #if __STDC__ 566 in_stf_input(struct mbuf *m, ...) 567 #else 568 in_stf_input(m, va_alist) 569 register struct mbuf *m; 570 #endif 571 { 572 int off, proto; 573 struct stf_softc *sc; 574 struct ip *ip; 575 struct ip6_hdr *ip6; 576 u_int8_t otos, itos; 577 int s, isr; 578 struct ifqueue *ifq = NULL; 579 struct ifnet *ifp; 580 va_list ap; 581 582 va_start(ap, m); 583 off = va_arg(ap, int); 584 proto = va_arg(ap, int); 585 va_end(ap); 586 587 if (proto != IPPROTO_IPV6) { 588 m_freem(m); 589 return; 590 } 591 592 ip = mtod(m, struct ip *); 593 594 sc = (struct stf_softc *)encap_getarg(m); 595 596 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 597 m_freem(m); 598 return; 599 } 600 601 ifp = &sc->sc_if; 602 603 /* 604 * perform sanity check against outer src/dst. 605 * for source, perform ingress filter as well. 606 */ 607 if (stf_checkaddr4(&ip->ip_dst, NULL) < 0 || 608 stf_checkaddr4(&ip->ip_src, m->m_pkthdr.rcvif) < 0) { 609 m_freem(m); 610 return; 611 } 612 613 otos = ip->ip_tos; 614 m_adj(m, off); 615 616 if (m->m_len < sizeof(*ip6)) { 617 m = m_pullup(m, sizeof(*ip6)); 618 if (!m) 619 return; 620 } 621 ip6 = mtod(m, struct ip6_hdr *); 622 623 /* 624 * perform sanity check against inner src/dst. 625 * for source, perform ingress filter as well. 626 */ 627 if (stf_checkaddr6(&ip6->ip6_dst, NULL) < 0 || 628 stf_checkaddr6(&ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 629 m_freem(m); 630 return; 631 } 632 633 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 634 if ((ifp->if_flags & IFF_LINK1) != 0) 635 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 636 ip6->ip6_flow &= ~htonl(0xff << 20); 637 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 638 639 m->m_pkthdr.rcvif = ifp; 640 641 #if NBPFILTER > 0 642 if (ifp->if_bpf) { 643 /* 644 * We need to prepend the address family as 645 * a four byte field. Cons up a dummy header 646 * to pacify bpf. This is safe because bpf 647 * will only read from the mbuf (i.e., it won't 648 * try to free it or keep a pointer a to it). 649 */ 650 struct mbuf m0; 651 u_int af = AF_INET6; 652 653 m0.m_next = m; 654 m0.m_len = 4; 655 m0.m_data = (char *)⁡ 656 657 #ifdef HAVE_OLD_BPF 658 bpf_mtap(ifp, &m0); 659 #else 660 bpf_mtap(ifp->if_bpf, &m0); 661 #endif 662 } 663 #endif /*NBPFILTER > 0*/ 664 665 /* 666 * Put the packet to the network layer input queue according to the 667 * specified address family. 668 * See net/if_gif.c for possible issues with packet processing 669 * reorder due to extra queueing. 670 */ 671 ifq = &ip6intrq; 672 isr = NETISR_IPV6; 673 674 s = splimp(); 675 if (IF_QFULL(ifq)) { 676 IF_DROP(ifq); /* update statistics */ 677 m_freem(m); 678 splx(s); 679 return; 680 } 681 IF_ENQUEUE(ifq, m); 682 schednetisr(isr); 683 ifp->if_ipackets++; 684 ifp->if_ibytes += m->m_pkthdr.len; 685 splx(s); 686 } 687 688 /* ARGSUSED */ 689 static void 690 stf_rtrequest(cmd, rt, sa) 691 int cmd; 692 struct rtentry *rt; 693 #if defined(__bsdi__) && _BSDI_VERSION >= 199802 694 struct rt_addrinfo *sa; 695 #else 696 struct sockaddr *sa; 697 #endif 698 { 699 700 if (rt) 701 rt->rt_rmx.rmx_mtu = IPV6_MMTU; 702 } 703 704 static int 705 stf_ioctl(ifp, cmd, data) 706 struct ifnet *ifp; 707 #if defined(__FreeBSD__) && __FreeBSD__ < 3 708 int cmd; 709 #else 710 u_long cmd; 711 #endif 712 caddr_t data; 713 { 714 struct ifaddr *ifa; 715 struct ifreq *ifr; 716 struct sockaddr_in6 *sin6; 717 int error; 718 719 error = 0; 720 switch (cmd) { 721 case SIOCSIFADDR: 722 ifa = (struct ifaddr *)data; 723 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 724 error = EAFNOSUPPORT; 725 break; 726 } 727 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 728 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) { 729 ifa->ifa_rtrequest = stf_rtrequest; 730 ifp->if_flags |= IFF_UP; 731 } else 732 error = EINVAL; 733 break; 734 735 case SIOCADDMULTI: 736 case SIOCDELMULTI: 737 ifr = (struct ifreq *)data; 738 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 739 ; 740 else 741 error = EAFNOSUPPORT; 742 break; 743 744 default: 745 error = EINVAL; 746 break; 747 } 748 749 return error; 750 } 751 752 #endif /* NSTF > 0 */ 753
Indexes created Mon Sep 29 21:09:56 GMT 2025