if_stf.c revision 1.12
1 /* $NetBSD: if_stf.c,v 1.12 2001/02/20 07:58:17 itojun Exp $ */ 2 /* $KAME: if_stf.c,v 1.53 2001/02/16 03:00:30 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 RFC3056. 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 * stf interface does not have, and will not need, a link-local address. 64 * It seems to have no real benefit and does not help the above symptoms much. 65 * Even if we assign link-locals to interface, we cannot really 66 * use link-local unicast/multicast on top of 6to4 cloud (since there's no 67 * encapsulation defined for link-local address), and the above analysis does 68 * not change. RFC3056 does not mandate the assignment of link-local address 69 * either. 70 * 71 * 6to4 interface has security issues. Refer to 72 * http://playground.iijlab.net/i-d/draft-itojun-ipv6-transition-abuse-00.txt 73 * for details. The code tries to filter out some of malicious packets. 74 * Note that there is no way to be 100% secure. 75 */ 76 77 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 78 #include "opt_inet.h" 79 #include "opt_inet6.h" 80 #endif 81 #ifdef __NetBSD__ 82 #include "opt_inet.h" 83 #endif 84 85 #include <sys/param.h> 86 #include <sys/systm.h> 87 #include <sys/socket.h> 88 #include <sys/sockio.h> 89 #include <sys/mbuf.h> 90 #include <sys/errno.h> 91 #if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) 92 #include <sys/ioctl.h> 93 #endif 94 #include <sys/protosw.h> 95 #ifdef __FreeBSD__ 96 #include <sys/kernel.h> 97 #endif 98 #include <sys/queue.h> 99 #include <sys/syslog.h> 100 #include <machine/cpu.h> 101 102 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 103 #include <sys/malloc.h> 104 #endif 105 106 #include <net/if.h> 107 #include <net/route.h> 108 #include <net/netisr.h> 109 #include <net/if_types.h> 110 #include <net/if_stf.h> 111 112 #include <netinet/in.h> 113 #include <netinet/in_systm.h> 114 #include <netinet/ip.h> 115 #include <netinet/ip_var.h> 116 #include <netinet/in_var.h> 117 118 #include <netinet/ip6.h> 119 #include <netinet6/ip6_var.h> 120 #include <netinet6/in6_gif.h> 121 #include <netinet6/in6_var.h> 122 #include <netinet/ip_ecn.h> 123 124 #include <netinet/ip_encap.h> 125 126 #include <machine/stdarg.h> 127 128 #include <net/net_osdep.h> 129 130 #if defined(__FreeBSD__) && __FreeBSD__ >= 4 131 #include "bpf.h" 132 #define NBPFILTER NBPF 133 #else 134 #include "bpfilter.h" 135 #endif 136 #include "stf.h" 137 #include "gif.h" /*XXX*/ 138 139 #if NBPFILTER > 0 140 #include <net/bpf.h> 141 #endif 142 143 #if NGIF > 0 144 #include <net/if_gif.h> 145 #endif 146 147 #if NSTF > 0 148 149 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 150 #define GET_V4(x) ((struct in_addr *)(&(x)->s6_addr16[1])) 151 152 struct stf_softc { 153 struct ifnet sc_if; /* common area */ 154 union { 155 struct route __sc_ro4; 156 struct route_in6 __sc_ro6; /* just for safety */ 157 } __sc_ro46; 158 #define sc_ro __sc_ro46.__sc_ro4 159 const struct encaptab *encap_cookie; 160 LIST_ENTRY(stf_softc) sc_list; 161 }; 162 163 LIST_HEAD(, stf_softc) stf_softc_list; 164 165 int stf_clone_create __P((struct if_clone *, int)); 166 void stf_clone_destroy __P((struct ifnet *)); 167 168 struct if_clone stf_cloner = 169 IF_CLONE_INITIALIZER("stf", stf_clone_create, stf_clone_destroy); 170 171 #if NGIF > 0 172 extern int ip_gif_ttl; /*XXX*/ 173 #else 174 static int ip_gif_ttl = 40; /*XXX*/ 175 #endif 176 177 extern struct protosw in_stf_protosw; 178 179 #ifdef __FreeBSD__ 180 void stfattach __P((void *)); 181 #else 182 void stfattach __P((int)); 183 #endif 184 static int stf_encapcheck __P((const struct mbuf *, int, int, void *)); 185 static struct in6_ifaddr *stf_getsrcifa6 __P((struct ifnet *)); 186 static int stf_output __P((struct ifnet *, struct mbuf *, struct sockaddr *, 187 struct rtentry *)); 188 static int stf_checkaddr4 __P((struct stf_softc *, struct in_addr *, 189 struct ifnet *)); 190 static int stf_checkaddr6 __P((struct stf_softc *, struct in6_addr *, 191 struct ifnet *)); 192 static void stf_rtrequest __P((int, struct rtentry *, struct rt_addrinfo *)); 193 #if defined(__FreeBSD__) && __FreeBSD__ < 3 194 static int stf_ioctl __P((struct ifnet *, int, caddr_t)); 195 #else 196 static int stf_ioctl __P((struct ifnet *, u_long, caddr_t)); 197 #endif 198 199 /* ARGSUSED */ 200 void 201 stfattach(count) 202 int count; 203 { 204 205 LIST_INIT(&stf_softc_list); 206 if_clone_attach(&stf_cloner); 207 } 208 209 int 210 stf_clone_create(ifc, unit) 211 struct if_clone *ifc; 212 int unit; 213 { 214 struct stf_softc *sc; 215 216 if (LIST_FIRST(&stf_softc_list) != NULL) { 217 /* Only one stf interface is allowed. */ 218 return (EEXIST); 219 } 220 221 sc = malloc(sizeof(struct stf_softc), M_DEVBUF, M_WAIT); 222 bzero(sc, sizeof(struct stf_softc)); 223 224 sprintf(sc->sc_if.if_xname, "%s%d", ifc->ifc_name, unit); 225 226 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 227 stf_encapcheck, &in_stf_protosw, sc); 228 if (sc->encap_cookie == NULL) { 229 printf("%s: unable to attach encap\n", if_name(&sc->sc_if)); 230 free(sc, M_DEVBUF); 231 return (EIO); /* XXX */ 232 } 233 234 sc->sc_if.if_mtu = IPV6_MMTU; 235 sc->sc_if.if_flags = 0; 236 sc->sc_if.if_ioctl = stf_ioctl; 237 sc->sc_if.if_output = stf_output; 238 sc->sc_if.if_type = IFT_STF; 239 sc->sc_if.if_dlt = DLT_NULL; 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_alloc_sadl(&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(sc, in, inifp) 475 struct stf_softc *sc; 476 struct in_addr *in; 477 struct ifnet *inifp; /* 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 (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 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 || rt->rt_ifp != inifp) { 528 #if 0 529 log(LOG_WARNING, "%s: packet from 0x%x dropped " 530 "due to ingress filter\n", if_name(&sc->sc_if), 531 (u_int32_t)ntohl(sin.sin_addr.s_addr)); 532 #endif 533 if (rt) 534 rtfree(rt); 535 return -1; 536 } 537 rtfree(rt); 538 } 539 540 return 0; 541 } 542 543 static int 544 stf_checkaddr6(sc, in6, inifp) 545 struct stf_softc *sc; 546 struct in6_addr *in6; 547 struct ifnet *inifp; /* incoming interface */ 548 { 549 /* 550 * check 6to4 addresses 551 */ 552 if (IN6_IS_ADDR_6TO4(in6)) 553 return stf_checkaddr4(sc, GET_V4(in6), inifp); 554 555 /* 556 * reject anything that look suspicious. the test is implemented 557 * in ip6_input too, but we check here as well to 558 * (1) reject bad packets earlier, and 559 * (2) to be safe against future ip6_input change. 560 */ 561 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 562 return -1; 563 564 return 0; 565 } 566 567 void 568 #if __STDC__ 569 in_stf_input(struct mbuf *m, ...) 570 #else 571 in_stf_input(m, va_alist) 572 struct mbuf *m; 573 #endif 574 { 575 int off, proto; 576 struct stf_softc *sc; 577 struct ip *ip; 578 struct ip6_hdr *ip6; 579 u_int8_t otos, itos; 580 int s, isr; 581 struct ifqueue *ifq = NULL; 582 struct ifnet *ifp; 583 va_list ap; 584 585 va_start(ap, m); 586 off = va_arg(ap, int); 587 proto = va_arg(ap, int); 588 va_end(ap); 589 590 if (proto != IPPROTO_IPV6) { 591 m_freem(m); 592 return; 593 } 594 595 ip = mtod(m, struct ip *); 596 597 sc = (struct stf_softc *)encap_getarg(m); 598 599 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 600 m_freem(m); 601 return; 602 } 603 604 ifp = &sc->sc_if; 605 606 /* 607 * perform sanity check against outer src/dst. 608 * for source, perform ingress filter as well. 609 */ 610 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 611 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 612 m_freem(m); 613 return; 614 } 615 616 otos = ip->ip_tos; 617 m_adj(m, off); 618 619 if (m->m_len < sizeof(*ip6)) { 620 m = m_pullup(m, sizeof(*ip6)); 621 if (!m) 622 return; 623 } 624 ip6 = mtod(m, struct ip6_hdr *); 625 626 /* 627 * perform sanity check against inner src/dst. 628 * for source, perform ingress filter as well. 629 */ 630 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 631 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 632 m_freem(m); 633 return; 634 } 635 636 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 637 if ((ifp->if_flags & IFF_LINK1) != 0) 638 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 639 ip6->ip6_flow &= ~htonl(0xff << 20); 640 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 641 642 m->m_pkthdr.rcvif = ifp; 643 644 #if NBPFILTER > 0 645 if (ifp->if_bpf) { 646 /* 647 * We need to prepend the address family as 648 * a four byte field. Cons up a dummy header 649 * to pacify bpf. This is safe because bpf 650 * will only read from the mbuf (i.e., it won't 651 * try to free it or keep a pointer a to it). 652 */ 653 struct mbuf m0; 654 u_int32_t af = AF_INET6; 655 656 m0.m_next = m; 657 m0.m_len = 4; 658 m0.m_data = (char *)⁡ 659 660 #ifdef HAVE_OLD_BPF 661 bpf_mtap(ifp, &m0); 662 #else 663 bpf_mtap(ifp->if_bpf, &m0); 664 #endif 665 } 666 #endif /*NBPFILTER > 0*/ 667 668 /* 669 * Put the packet to the network layer input queue according to the 670 * specified address family. 671 * See net/if_gif.c for possible issues with packet processing 672 * reorder due to extra queueing. 673 */ 674 ifq = &ip6intrq; 675 isr = NETISR_IPV6; 676 677 s = splimp(); 678 if (IF_QFULL(ifq)) { 679 IF_DROP(ifq); /* update statistics */ 680 m_freem(m); 681 splx(s); 682 return; 683 } 684 IF_ENQUEUE(ifq, m); 685 schednetisr(isr); 686 ifp->if_ipackets++; 687 ifp->if_ibytes += m->m_pkthdr.len; 688 splx(s); 689 } 690 691 /* ARGSUSED */ 692 static void 693 stf_rtrequest(cmd, rt, info) 694 int cmd; 695 struct rtentry *rt; 696 struct rt_addrinfo *info; 697 { 698 699 if (rt) 700 rt->rt_rmx.rmx_mtu = IPV6_MMTU; 701 } 702 703 static int 704 stf_ioctl(ifp, cmd, data) 705 struct ifnet *ifp; 706 #if defined(__FreeBSD__) && __FreeBSD__ < 3 707 int cmd; 708 #else 709 u_long cmd; 710 #endif 711 caddr_t data; 712 { 713 struct ifaddr *ifa; 714 struct ifreq *ifr; 715 struct sockaddr_in6 *sin6; 716 int error; 717 718 error = 0; 719 switch (cmd) { 720 case SIOCSIFADDR: 721 ifa = (struct ifaddr *)data; 722 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 723 error = EAFNOSUPPORT; 724 break; 725 } 726 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 727 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) { 728 ifa->ifa_rtrequest = stf_rtrequest; 729 ifp->if_flags |= IFF_UP; 730 } else 731 error = EINVAL; 732 break; 733 734 case SIOCADDMULTI: 735 case SIOCDELMULTI: 736 ifr = (struct ifreq *)data; 737 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 738 ; 739 else 740 error = EAFNOSUPPORT; 741 break; 742 743 default: 744 error = EINVAL; 745 break; 746 } 747 748 return error; 749 } 750 751 #endif /* NSTF > 0 */ 752
Indexes created Tue Sep 30 07:10:03 GMT 2025