if_stf.c revision 1.24
1 /* $NetBSD: if_stf.c,v 1.24 2002/06/20 07:43:39 itojun Exp $ */ 2 /* $KAME: if_stf.c,v 1.62 2001/06/07 22:32:16 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 #include <sys/cdefs.h> 78 __KERNEL_RCSID(0, "$NetBSD: if_stf.c,v 1.24 2002/06/20 07:43:39 itojun Exp $"); 79 80 #include "opt_inet.h" 81 82 #include <sys/param.h> 83 #include <sys/systm.h> 84 #include <sys/socket.h> 85 #include <sys/sockio.h> 86 #include <sys/mbuf.h> 87 #include <sys/errno.h> 88 #include <sys/ioctl.h> 89 #include <sys/protosw.h> 90 #include <sys/queue.h> 91 #include <sys/syslog.h> 92 #include <machine/cpu.h> 93 94 #include <net/if.h> 95 #include <net/route.h> 96 #include <net/netisr.h> 97 #include <net/if_types.h> 98 #include <net/if_stf.h> 99 100 #include <netinet/in.h> 101 #include <netinet/in_systm.h> 102 #include <netinet/ip.h> 103 #include <netinet/ip_var.h> 104 #include <netinet/in_var.h> 105 106 #include <netinet/ip6.h> 107 #include <netinet6/ip6_var.h> 108 #include <netinet6/in6_gif.h> 109 #include <netinet6/in6_var.h> 110 #include <netinet/ip_ecn.h> 111 112 #include <netinet/ip_encap.h> 113 114 #include <machine/stdarg.h> 115 116 #include <net/net_osdep.h> 117 118 #include "bpfilter.h" 119 #include "stf.h" 120 #include "gif.h" /*XXX*/ 121 122 #if NBPFILTER > 0 123 #include <net/bpf.h> 124 #endif 125 126 #if NGIF > 0 127 #include <net/if_gif.h> 128 #endif 129 130 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 131 #define GET_V4(x) ((struct in_addr *)(&(x)->s6_addr16[1])) 132 133 struct stf_softc { 134 struct ifnet sc_if; /* common area */ 135 union { 136 struct route __sc_ro4; 137 struct route_in6 __sc_ro6; /* just for safety */ 138 } __sc_ro46; 139 #define sc_ro __sc_ro46.__sc_ro4 140 const struct encaptab *encap_cookie; 141 LIST_ENTRY(stf_softc) sc_list; 142 }; 143 144 LIST_HEAD(, stf_softc) stf_softc_list; 145 146 int stf_clone_create __P((struct if_clone *, int)); 147 void stf_clone_destroy __P((struct ifnet *)); 148 149 struct if_clone stf_cloner = 150 IF_CLONE_INITIALIZER("stf", stf_clone_create, stf_clone_destroy); 151 152 #if NGIF > 0 153 extern int ip_gif_ttl; /*XXX*/ 154 #else 155 static int ip_gif_ttl = 40; /*XXX*/ 156 #endif 157 158 extern struct domain inetdomain; 159 struct protosw in_stf_protosw = 160 { SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR, 161 in_stf_input, rip_output, 0, rip_ctloutput, 162 rip_usrreq, 163 0, 0, 0, 0 164 }; 165 166 void stfattach __P((int)); 167 static int stf_encapcheck __P((const struct mbuf *, int, int, void *)); 168 static struct in6_ifaddr *stf_getsrcifa6 __P((struct ifnet *)); 169 static int stf_output __P((struct ifnet *, struct mbuf *, struct sockaddr *, 170 struct rtentry *)); 171 static int stf_checkaddr4 __P((struct stf_softc *, struct in_addr *, 172 struct ifnet *)); 173 static int stf_checkaddr6 __P((struct stf_softc *, struct in6_addr *, 174 struct ifnet *)); 175 static void stf_rtrequest __P((int, struct rtentry *, struct rt_addrinfo *)); 176 static int stf_ioctl __P((struct ifnet *, u_long, caddr_t)); 177 178 /* ARGSUSED */ 179 void 180 stfattach(count) 181 int count; 182 { 183 184 LIST_INIT(&stf_softc_list); 185 if_clone_attach(&stf_cloner); 186 } 187 188 int 189 stf_clone_create(ifc, unit) 190 struct if_clone *ifc; 191 int unit; 192 { 193 struct stf_softc *sc; 194 195 if (LIST_FIRST(&stf_softc_list) != NULL) { 196 /* Only one stf interface is allowed. */ 197 return (EEXIST); 198 } 199 200 sc = malloc(sizeof(struct stf_softc), M_DEVBUF, M_WAIT); 201 memset(sc, 0, sizeof(struct stf_softc)); 202 203 sprintf(sc->sc_if.if_xname, "%s%d", ifc->ifc_name, unit); 204 205 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 206 stf_encapcheck, &in_stf_protosw, sc); 207 if (sc->encap_cookie == NULL) { 208 printf("%s: unable to attach encap\n", if_name(&sc->sc_if)); 209 free(sc, M_DEVBUF); 210 return (EIO); /* XXX */ 211 } 212 213 sc->sc_if.if_mtu = IPV6_MMTU; 214 sc->sc_if.if_flags = 0; 215 sc->sc_if.if_ioctl = stf_ioctl; 216 sc->sc_if.if_output = stf_output; 217 sc->sc_if.if_type = IFT_STF; 218 sc->sc_if.if_dlt = DLT_NULL; 219 if_attach(&sc->sc_if); 220 if_alloc_sadl(&sc->sc_if); 221 #if NBPFILTER > 0 222 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 223 #endif 224 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 225 return (0); 226 } 227 228 void 229 stf_clone_destroy(ifp) 230 struct ifnet *ifp; 231 { 232 struct stf_softc *sc = (void *) ifp; 233 234 LIST_REMOVE(sc, sc_list); 235 encap_detach(sc->encap_cookie); 236 #if NBPFILTER > 0 237 bpfdetach(ifp); 238 #endif 239 if_detach(ifp); 240 free(sc, M_DEVBUF); 241 } 242 243 static int 244 stf_encapcheck(m, off, proto, arg) 245 const struct mbuf *m; 246 int off; 247 int proto; 248 void *arg; 249 { 250 struct ip ip; 251 struct in6_ifaddr *ia6; 252 struct stf_softc *sc; 253 struct in_addr a, b; 254 255 sc = (struct stf_softc *)arg; 256 if (sc == NULL) 257 return 0; 258 259 if ((sc->sc_if.if_flags & IFF_UP) == 0) 260 return 0; 261 262 /* IFF_LINK0 means "no decapsulation" */ 263 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 264 return 0; 265 266 if (proto != IPPROTO_IPV6) 267 return 0; 268 269 /* LINTED const cast */ 270 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); 271 272 if (ip.ip_v != 4) 273 return 0; 274 275 ia6 = stf_getsrcifa6(&sc->sc_if); 276 if (ia6 == NULL) 277 return 0; 278 279 /* 280 * check if IPv4 dst matches the IPv4 address derived from the 281 * local 6to4 address. 282 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 283 */ 284 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 285 sizeof(ip.ip_dst)) != 0) 286 return 0; 287 288 /* 289 * check if IPv4 src matches the IPv4 address derived from the 290 * local 6to4 address masked by prefixmask. 291 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 292 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 293 */ 294 memset(&a, 0, sizeof(a)); 295 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 296 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 297 b = ip.ip_src; 298 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 299 if (a.s_addr != b.s_addr) 300 return 0; 301 302 /* stf interface makes single side match only */ 303 return 32; 304 } 305 306 static struct in6_ifaddr * 307 stf_getsrcifa6(ifp) 308 struct ifnet *ifp; 309 { 310 struct ifaddr *ia; 311 struct in_ifaddr *ia4; 312 struct sockaddr_in6 *sin6; 313 struct in_addr in; 314 315 TAILQ_FOREACH(ia, &ifp->if_addrlist, ifa_list) 316 { 317 if (ia->ifa_addr == NULL) 318 continue; 319 if (ia->ifa_addr->sa_family != AF_INET6) 320 continue; 321 sin6 = (struct sockaddr_in6 *)ia->ifa_addr; 322 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 323 continue; 324 325 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 326 INADDR_TO_IA(in, ia4); 327 if (ia4 == NULL) 328 continue; 329 330 return (struct in6_ifaddr *)ia; 331 } 332 333 return NULL; 334 } 335 336 static int 337 stf_output(ifp, m, dst, rt) 338 struct ifnet *ifp; 339 struct mbuf *m; 340 struct sockaddr *dst; 341 struct rtentry *rt; 342 { 343 struct stf_softc *sc; 344 struct sockaddr_in6 *dst6; 345 struct in_addr *in4; 346 struct sockaddr_in *dst4; 347 u_int8_t tos; 348 struct ip *ip; 349 struct ip6_hdr *ip6; 350 struct in6_ifaddr *ia6; 351 352 sc = (struct stf_softc*)ifp; 353 dst6 = (struct sockaddr_in6 *)dst; 354 355 /* just in case */ 356 if ((ifp->if_flags & IFF_UP) == 0) { 357 m_freem(m); 358 return ENETDOWN; 359 } 360 361 /* 362 * If we don't have an ip4 address that match my inner ip6 address, 363 * we shouldn't generate output. Without this check, we'll end up 364 * using wrong IPv4 source. 365 */ 366 ia6 = stf_getsrcifa6(ifp); 367 if (ia6 == NULL) { 368 m_freem(m); 369 return ENETDOWN; 370 } 371 372 if (m->m_len < sizeof(*ip6)) { 373 m = m_pullup(m, sizeof(*ip6)); 374 if (!m) 375 return ENOBUFS; 376 } 377 ip6 = mtod(m, struct ip6_hdr *); 378 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 379 380 /* 381 * Pickup the right outer dst addr from the list of candidates. 382 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 383 */ 384 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 385 in4 = GET_V4(&ip6->ip6_dst); 386 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 387 in4 = GET_V4(&dst6->sin6_addr); 388 else { 389 m_freem(m); 390 return ENETUNREACH; 391 } 392 393 #if NBPFILTER > 0 394 if (ifp->if_bpf) { 395 /* 396 * We need to prepend the address family as 397 * a four byte field. Cons up a dummy header 398 * to pacify bpf. This is safe because bpf 399 * will only read from the mbuf (i.e., it won't 400 * try to free it or keep a pointer a to it). 401 */ 402 struct mbuf m0; 403 u_int32_t af = AF_INET6; 404 405 m0.m_next = m; 406 m0.m_len = 4; 407 m0.m_data = (char *)⁡ 408 409 #ifdef HAVE_OLD_BPF 410 bpf_mtap(ifp, &m0); 411 #else 412 bpf_mtap(ifp->if_bpf, &m0); 413 #endif 414 } 415 #endif /*NBPFILTER > 0*/ 416 417 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 418 if (m && m->m_len < sizeof(struct ip)) 419 m = m_pullup(m, sizeof(struct ip)); 420 if (m == NULL) 421 return ENOBUFS; 422 ip = mtod(m, struct ip *); 423 424 memset(ip, 0, sizeof(*ip)); 425 426 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 427 &ip->ip_src, sizeof(ip->ip_src)); 428 bcopy(in4, &ip->ip_dst, sizeof(ip->ip_dst)); 429 ip->ip_p = IPPROTO_IPV6; 430 ip->ip_ttl = ip_gif_ttl; /*XXX*/ 431 ip->ip_len = m->m_pkthdr.len; /*host order*/ 432 if (ifp->if_flags & IFF_LINK1) 433 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 434 else 435 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 436 437 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst; 438 if (dst4->sin_family != AF_INET || 439 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) { 440 /* cache route doesn't match */ 441 dst4->sin_family = AF_INET; 442 dst4->sin_len = sizeof(struct sockaddr_in); 443 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr)); 444 if (sc->sc_ro.ro_rt) { 445 RTFREE(sc->sc_ro.ro_rt); 446 sc->sc_ro.ro_rt = NULL; 447 } 448 } 449 450 if (sc->sc_ro.ro_rt == NULL) { 451 rtalloc(&sc->sc_ro); 452 if (sc->sc_ro.ro_rt == NULL) { 453 m_freem(m); 454 return ENETUNREACH; 455 } 456 } 457 458 return ip_output(m, NULL, &sc->sc_ro, 0, NULL); 459 } 460 461 static int 462 stf_checkaddr4(sc, in, inifp) 463 struct stf_softc *sc; 464 struct in_addr *in; 465 struct ifnet *inifp; /* incoming interface */ 466 { 467 struct in_ifaddr *ia4; 468 469 /* 470 * reject packets with the following address: 471 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 472 */ 473 if (IN_MULTICAST(in->s_addr)) 474 return -1; 475 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 476 case 0: case 127: case 255: 477 return -1; 478 } 479 480 /* 481 * reject packets with private address range: 482 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 483 */ 484 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 || 485 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 || 486 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168) 487 return -1; 488 489 /* 490 * reject packets with broadcast 491 */ 492 TAILQ_FOREACH(ia4, &in_ifaddr, ia_list) 493 { 494 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 495 continue; 496 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 497 return -1; 498 } 499 500 /* 501 * perform ingress filter 502 */ 503 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 504 struct sockaddr_in sin; 505 struct rtentry *rt; 506 507 memset(&sin, 0, sizeof(sin)); 508 sin.sin_family = AF_INET; 509 sin.sin_len = sizeof(struct sockaddr_in); 510 sin.sin_addr = *in; 511 rt = rtalloc1((struct sockaddr *)&sin, 0); 512 if (!rt || rt->rt_ifp != inifp) { 513 #if 0 514 log(LOG_WARNING, "%s: packet from 0x%x dropped " 515 "due to ingress filter\n", if_name(&sc->sc_if), 516 (u_int32_t)ntohl(sin.sin_addr.s_addr)); 517 #endif 518 if (rt) 519 rtfree(rt); 520 return -1; 521 } 522 rtfree(rt); 523 } 524 525 return 0; 526 } 527 528 static int 529 stf_checkaddr6(sc, in6, inifp) 530 struct stf_softc *sc; 531 struct in6_addr *in6; 532 struct ifnet *inifp; /* incoming interface */ 533 { 534 /* 535 * check 6to4 addresses 536 */ 537 if (IN6_IS_ADDR_6TO4(in6)) 538 return stf_checkaddr4(sc, GET_V4(in6), inifp); 539 540 /* 541 * reject anything that look suspicious. the test is implemented 542 * in ip6_input too, but we check here as well to 543 * (1) reject bad packets earlier, and 544 * (2) to be safe against future ip6_input change. 545 */ 546 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 547 return -1; 548 549 return 0; 550 } 551 552 void 553 #if __STDC__ 554 in_stf_input(struct mbuf *m, ...) 555 #else 556 in_stf_input(m, va_alist) 557 struct mbuf *m; 558 #endif 559 { 560 int off, proto; 561 struct stf_softc *sc; 562 struct ip *ip; 563 struct ip6_hdr *ip6; 564 u_int8_t otos, itos; 565 int s, isr; 566 struct ifqueue *ifq = NULL; 567 struct ifnet *ifp; 568 va_list ap; 569 570 va_start(ap, m); 571 off = va_arg(ap, int); 572 proto = va_arg(ap, int); 573 va_end(ap); 574 575 if (proto != IPPROTO_IPV6) { 576 m_freem(m); 577 return; 578 } 579 580 ip = mtod(m, struct ip *); 581 582 sc = (struct stf_softc *)encap_getarg(m); 583 584 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 585 m_freem(m); 586 return; 587 } 588 589 ifp = &sc->sc_if; 590 591 /* 592 * perform sanity check against outer src/dst. 593 * for source, perform ingress filter as well. 594 */ 595 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 596 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 597 m_freem(m); 598 return; 599 } 600 601 otos = ip->ip_tos; 602 m_adj(m, off); 603 604 if (m->m_len < sizeof(*ip6)) { 605 m = m_pullup(m, sizeof(*ip6)); 606 if (!m) 607 return; 608 } 609 ip6 = mtod(m, struct ip6_hdr *); 610 611 /* 612 * perform sanity check against inner src/dst. 613 * for source, perform ingress filter as well. 614 */ 615 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 616 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 617 m_freem(m); 618 return; 619 } 620 621 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 622 if ((ifp->if_flags & IFF_LINK1) != 0) 623 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 624 else 625 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 626 ip6->ip6_flow &= ~htonl(0xff << 20); 627 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 628 629 m->m_pkthdr.rcvif = ifp; 630 631 #if NBPFILTER > 0 632 if (ifp->if_bpf) { 633 /* 634 * We need to prepend the address family as 635 * a four byte field. Cons up a dummy header 636 * to pacify bpf. This is safe because bpf 637 * will only read from the mbuf (i.e., it won't 638 * try to free it or keep a pointer a to it). 639 */ 640 struct mbuf m0; 641 u_int32_t af = AF_INET6; 642 643 m0.m_next = m; 644 m0.m_len = 4; 645 m0.m_data = (char *)⁡ 646 647 #ifdef HAVE_OLD_BPF 648 bpf_mtap(ifp, &m0); 649 #else 650 bpf_mtap(ifp->if_bpf, &m0); 651 #endif 652 } 653 #endif /*NBPFILTER > 0*/ 654 655 /* 656 * Put the packet to the network layer input queue according to the 657 * specified address family. 658 * See net/if_gif.c for possible issues with packet processing 659 * reorder due to extra queueing. 660 */ 661 ifq = &ip6intrq; 662 isr = NETISR_IPV6; 663 664 s = splnet(); 665 if (IF_QFULL(ifq)) { 666 IF_DROP(ifq); /* update statistics */ 667 m_freem(m); 668 splx(s); 669 return; 670 } 671 IF_ENQUEUE(ifq, m); 672 schednetisr(isr); 673 ifp->if_ipackets++; 674 ifp->if_ibytes += m->m_pkthdr.len; 675 splx(s); 676 } 677 678 /* ARGSUSED */ 679 static void 680 stf_rtrequest(cmd, rt, info) 681 int cmd; 682 struct rtentry *rt; 683 struct rt_addrinfo *info; 684 { 685 686 if (rt) 687 rt->rt_rmx.rmx_mtu = IPV6_MMTU; 688 } 689 690 static int 691 stf_ioctl(ifp, cmd, data) 692 struct ifnet *ifp; 693 u_long cmd; 694 caddr_t data; 695 { 696 struct ifaddr *ifa; 697 struct ifreq *ifr; 698 struct sockaddr_in6 *sin6; 699 int error; 700 701 error = 0; 702 switch (cmd) { 703 case SIOCSIFADDR: 704 ifa = (struct ifaddr *)data; 705 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 706 error = EAFNOSUPPORT; 707 break; 708 } 709 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 710 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) { 711 ifa->ifa_rtrequest = stf_rtrequest; 712 ifp->if_flags |= IFF_UP; 713 } else 714 error = EINVAL; 715 break; 716 717 case SIOCADDMULTI: 718 case SIOCDELMULTI: 719 ifr = (struct ifreq *)data; 720 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 721 ; 722 else 723 error = EAFNOSUPPORT; 724 break; 725 726 default: 727 error = EINVAL; 728 break; 729 } 730 731 return error; 732 } 733
Indexes created Tue Sep 30 07:10:03 GMT 2025