if_stf.c revision 1.7
1 /* $NetBSD: if_stf.c,v 1.7 2000/12/18 19:50:45 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 NBPFILTER > 0 246 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 247 #endif 248 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 249 return (0); 250 } 251 252 void 253 stf_clone_destroy(ifp) 254 struct ifnet *ifp; 255 { 256 struct stf_softc *sc = (void *) ifp; 257 258 LIST_REMOVE(sc, sc_list); 259 encap_detach(sc->encap_cookie); 260 #if NBPFILTER > 0 261 bpfdetach(ifp); 262 #endif 263 if_detach(ifp); 264 free(sc, M_DEVBUF); 265 } 266 267 #ifdef __FreeBSD__ 268 PSEUDO_SET(stfattach, if_stf); 269 #endif 270 271 static int 272 stf_encapcheck(m, off, proto, arg) 273 const struct mbuf *m; 274 int off; 275 int proto; 276 void *arg; 277 { 278 struct ip ip; 279 struct in6_ifaddr *ia6; 280 struct stf_softc *sc; 281 struct in_addr a, b; 282 283 sc = (struct stf_softc *)arg; 284 if (sc == NULL) 285 return 0; 286 287 if ((sc->sc_if.if_flags & IFF_UP) == 0) 288 return 0; 289 290 if (proto != IPPROTO_IPV6) 291 return 0; 292 293 /* LINTED const cast */ 294 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); 295 296 if (ip.ip_v != 4) 297 return 0; 298 299 ia6 = stf_getsrcifa6(&sc->sc_if); 300 if (ia6 == NULL) 301 return 0; 302 303 /* 304 * check if IPv4 dst matches the IPv4 address derived from the 305 * local 6to4 address. 306 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 307 */ 308 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 309 sizeof(ip.ip_dst)) != 0) 310 return 0; 311 312 /* 313 * check if IPv4 src matches the IPv4 address derived from the 314 * local 6to4 address masked by prefixmask. 315 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 316 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 317 */ 318 bzero(&a, sizeof(a)); 319 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 320 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 321 b = ip.ip_src; 322 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 323 if (a.s_addr != b.s_addr) 324 return 0; 325 326 /* stf interface makes single side match only */ 327 return 32; 328 } 329 330 static struct in6_ifaddr * 331 stf_getsrcifa6(ifp) 332 struct ifnet *ifp; 333 { 334 struct ifaddr *ia; 335 struct in_ifaddr *ia4; 336 struct sockaddr_in6 *sin6; 337 struct in_addr in; 338 339 #if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3) 340 for (ia = ifp->if_addrlist; ia; ia = ia->ifa_next) 341 #else 342 for (ia = ifp->if_addrlist.tqh_first; 343 ia; 344 ia = ia->ifa_list.tqe_next) 345 #endif 346 { 347 if (ia->ifa_addr == NULL) 348 continue; 349 if (ia->ifa_addr->sa_family != AF_INET6) 350 continue; 351 sin6 = (struct sockaddr_in6 *)ia->ifa_addr; 352 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 353 continue; 354 355 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 356 #ifdef __NetBSD__ 357 INADDR_TO_IA(in, ia4); 358 #else 359 #ifdef __OpenBSD__ 360 for (ia4 = in_ifaddr.tqh_first; 361 ia4; 362 ia4 = ia4->ia_list.tqe_next) 363 #elif defined(__FreeBSD__) && __FreeBSD__ >= 3 364 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 365 ia4; 366 ia4 = TAILQ_NEXT(ia4, ia_link)) 367 #else 368 for (ia4 = in_ifaddr; ia4 != NULL; ia4 = ia4->ia_next) 369 #endif 370 { 371 if (ia4->ia_addr.sin_addr.s_addr == in.s_addr) 372 break; 373 } 374 #endif 375 if (ia4 == NULL) 376 continue; 377 378 return (struct in6_ifaddr *)ia; 379 } 380 381 return NULL; 382 } 383 384 static int 385 stf_output(ifp, m, dst, rt) 386 struct ifnet *ifp; 387 struct mbuf *m; 388 struct sockaddr *dst; 389 struct rtentry *rt; 390 { 391 struct stf_softc *sc; 392 struct sockaddr_in6 *dst6; 393 struct sockaddr_in *dst4; 394 u_int8_t tos; 395 struct ip *ip; 396 struct ip6_hdr *ip6; 397 struct in6_ifaddr *ia6; 398 399 sc = (struct stf_softc*)ifp; 400 dst6 = (struct sockaddr_in6 *)dst; 401 402 /* just in case */ 403 if ((ifp->if_flags & IFF_UP) == 0) { 404 m_freem(m); 405 return ENETDOWN; 406 } 407 408 /* 409 * If we don't have an ip4 address that match my inner ip6 address, 410 * we shouldn't generate output. Without this check, we'll end up 411 * using wrong IPv4 source. 412 */ 413 ia6 = stf_getsrcifa6(ifp); 414 if (ia6 == NULL) { 415 m_freem(m); 416 return ENETDOWN; 417 } 418 419 if (m->m_len < sizeof(*ip6)) { 420 m = m_pullup(m, sizeof(*ip6)); 421 if (!m) 422 return ENOBUFS; 423 } 424 ip6 = mtod(m, struct ip6_hdr *); 425 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 426 427 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 428 if (m && m->m_len < sizeof(struct ip)) 429 m = m_pullup(m, sizeof(struct ip)); 430 if (m == NULL) 431 return ENOBUFS; 432 ip = mtod(m, struct ip *); 433 434 bzero(ip, sizeof(*ip)); 435 436 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 437 &ip->ip_src, sizeof(ip->ip_src)); 438 bcopy(GET_V4(&dst6->sin6_addr), &ip->ip_dst, sizeof(ip->ip_dst)); 439 ip->ip_p = IPPROTO_IPV6; 440 ip->ip_ttl = ip_gif_ttl; /*XXX*/ 441 ip->ip_len = m->m_pkthdr.len; /*host order*/ 442 if (ifp->if_flags & IFF_LINK1) 443 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 444 445 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst; 446 if (dst4->sin_family != AF_INET || 447 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) { 448 /* cache route doesn't match */ 449 dst4->sin_family = AF_INET; 450 dst4->sin_len = sizeof(struct sockaddr_in); 451 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr)); 452 if (sc->sc_ro.ro_rt) { 453 RTFREE(sc->sc_ro.ro_rt); 454 sc->sc_ro.ro_rt = NULL; 455 } 456 } 457 458 if (sc->sc_ro.ro_rt == NULL) { 459 rtalloc(&sc->sc_ro); 460 if (sc->sc_ro.ro_rt == NULL) { 461 m_freem(m); 462 return ENETUNREACH; 463 } 464 } 465 466 #ifndef __OpenBSD__ 467 return ip_output(m, NULL, &sc->sc_ro, 0, NULL); 468 #else 469 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 470 #endif 471 } 472 473 static int 474 stf_checkaddr4(in, ifp) 475 struct in_addr *in; 476 struct ifnet *ifp; /* 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 (ifp) { 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) 527 return -1; 528 if (rt->rt_ifp != ifp) { 529 rtfree(rt); 530 return -1; 531 } 532 rtfree(rt); 533 } 534 535 return 0; 536 } 537 538 static int 539 stf_checkaddr6(in6, ifp) 540 struct in6_addr *in6; 541 struct ifnet *ifp; /* incoming interface */ 542 { 543 /* 544 * check 6to4 addresses 545 */ 546 if (IN6_IS_ADDR_6TO4(in6)) 547 return stf_checkaddr4(GET_V4(in6), ifp); 548 549 /* 550 * reject anything that look suspicious. the test is implemented 551 * in ip6_input too, but we check here as well to 552 * (1) reject bad packets earlier, and 553 * (2) to be safe against future ip6_input change. 554 */ 555 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 556 return -1; 557 558 return 0; 559 } 560 561 void 562 #if __STDC__ 563 in_stf_input(struct mbuf *m, ...) 564 #else 565 in_stf_input(m, va_alist) 566 register struct mbuf *m; 567 #endif 568 { 569 int off, proto; 570 struct stf_softc *sc; 571 struct ip *ip; 572 struct ip6_hdr *ip6; 573 u_int8_t otos, itos; 574 int s, isr; 575 struct ifqueue *ifq = NULL; 576 struct ifnet *ifp; 577 va_list ap; 578 579 va_start(ap, m); 580 off = va_arg(ap, int); 581 proto = va_arg(ap, int); 582 va_end(ap); 583 584 if (proto != IPPROTO_IPV6) { 585 m_freem(m); 586 return; 587 } 588 589 ip = mtod(m, struct ip *); 590 591 sc = (struct stf_softc *)encap_getarg(m); 592 593 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 594 m_freem(m); 595 return; 596 } 597 598 ifp = &sc->sc_if; 599 600 /* 601 * perform sanity check against outer src/dst. 602 * for source, perform ingress filter as well. 603 */ 604 if (stf_checkaddr4(&ip->ip_dst, NULL) < 0 || 605 stf_checkaddr4(&ip->ip_src, m->m_pkthdr.rcvif) < 0) { 606 m_freem(m); 607 return; 608 } 609 610 otos = ip->ip_tos; 611 m_adj(m, off); 612 613 if (m->m_len < sizeof(*ip6)) { 614 m = m_pullup(m, sizeof(*ip6)); 615 if (!m) 616 return; 617 } 618 ip6 = mtod(m, struct ip6_hdr *); 619 620 /* 621 * perform sanity check against inner src/dst. 622 * for source, perform ingress filter as well. 623 */ 624 if (stf_checkaddr6(&ip6->ip6_dst, NULL) < 0 || 625 stf_checkaddr6(&ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 626 m_freem(m); 627 return; 628 } 629 630 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 631 if ((ifp->if_flags & IFF_LINK1) != 0) 632 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 633 ip6->ip6_flow &= ~htonl(0xff << 20); 634 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 635 636 m->m_pkthdr.rcvif = ifp; 637 638 #if NBPFILTER > 0 639 if (ifp->if_bpf) { 640 /* 641 * We need to prepend the address family as 642 * a four byte field. Cons up a dummy header 643 * to pacify bpf. This is safe because bpf 644 * will only read from the mbuf (i.e., it won't 645 * try to free it or keep a pointer a to it). 646 */ 647 struct mbuf m0; 648 u_int af = AF_INET6; 649 650 m0.m_next = m; 651 m0.m_len = 4; 652 m0.m_data = (char *)⁡ 653 654 #ifdef HAVE_OLD_BPF 655 bpf_mtap(ifp, &m0); 656 #else 657 bpf_mtap(ifp->if_bpf, &m0); 658 #endif 659 } 660 #endif /*NBPFILTER > 0*/ 661 662 /* 663 * Put the packet to the network layer input queue according to the 664 * specified address family. 665 * See net/if_gif.c for possible issues with packet processing 666 * reorder due to extra queueing. 667 */ 668 ifq = &ip6intrq; 669 isr = NETISR_IPV6; 670 671 s = splimp(); 672 if (IF_QFULL(ifq)) { 673 IF_DROP(ifq); /* update statistics */ 674 m_freem(m); 675 splx(s); 676 return; 677 } 678 IF_ENQUEUE(ifq, m); 679 schednetisr(isr); 680 ifp->if_ipackets++; 681 ifp->if_ibytes += m->m_pkthdr.len; 682 splx(s); 683 } 684 685 /* ARGSUSED */ 686 static void 687 stf_rtrequest(cmd, rt, sa) 688 int cmd; 689 struct rtentry *rt; 690 #if defined(__bsdi__) && _BSDI_VERSION >= 199802 691 struct rt_addrinfo *sa; 692 #else 693 struct sockaddr *sa; 694 #endif 695 { 696 697 if (rt) 698 rt->rt_rmx.rmx_mtu = IPV6_MMTU; 699 } 700 701 static int 702 stf_ioctl(ifp, cmd, data) 703 struct ifnet *ifp; 704 #if defined(__FreeBSD__) && __FreeBSD__ < 3 705 int cmd; 706 #else 707 u_long cmd; 708 #endif 709 caddr_t data; 710 { 711 struct ifaddr *ifa; 712 struct ifreq *ifr; 713 struct sockaddr_in6 *sin6; 714 int error; 715 716 error = 0; 717 switch (cmd) { 718 case SIOCSIFADDR: 719 ifa = (struct ifaddr *)data; 720 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 721 error = EAFNOSUPPORT; 722 break; 723 } 724 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 725 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) { 726 ifa->ifa_rtrequest = stf_rtrequest; 727 ifp->if_flags |= IFF_UP; 728 } else 729 error = EINVAL; 730 break; 731 732 case SIOCADDMULTI: 733 case SIOCDELMULTI: 734 ifr = (struct ifreq *)data; 735 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 736 ; 737 else 738 error = EAFNOSUPPORT; 739 break; 740 741 default: 742 error = EINVAL; 743 break; 744 } 745 746 return error; 747 } 748 749 #endif /* NSTF > 0 */ 750
Indexes created Mon Sep 29 21:09:56 GMT 2025