if_stf.c revision 92081
1/* $FreeBSD: head/sys/net/if_stf.c 92081 2002-03-11 09:26:07Z mux $ */ 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 "opt_inet.h" 78#include "opt_inet6.h" 79 80#include <sys/param.h> 81#include <sys/systm.h> 82#include <sys/socket.h> 83#include <sys/sockio.h> 84#include <sys/mbuf.h> 85#include <sys/errno.h> 86#include <sys/kernel.h> 87#include <sys/protosw.h> 88#include <sys/queue.h> 89#include <machine/cpu.h> 90 91#include <sys/malloc.h> 92 93#include <net/if.h> 94#include <net/route.h> 95#include <net/netisr.h> 96#include <net/if_types.h> 97#include <net/if_stf.h> 98 99#include <netinet/in.h> 100#include <netinet/in_systm.h> 101#include <netinet/ip.h> 102#include <netinet/ip_var.h> 103#include <netinet/in_var.h> 104 105#include <netinet/ip6.h> 106#include <netinet6/ip6_var.h> 107#include <netinet6/in6_var.h> 108#include <netinet/ip_ecn.h> 109 110#include <netinet/ip_encap.h> 111 112#include <machine/stdarg.h> 113 114#include <net/net_osdep.h> 115 116#include <net/bpf.h> 117 118#define STFNAME "stf" 119 120#define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 121#define GET_V4(x) ((struct in_addr *)(&(x)->s6_addr16[1])) 122 123struct stf_softc { 124 struct ifnet sc_if; /* common area */ 125 union { 126 struct route __sc_ro4; 127 struct route_in6 __sc_ro6; /* just for safety */ 128 } __sc_ro46; 129#define sc_ro __sc_ro46.__sc_ro4 130 const struct encaptab *encap_cookie; 131 LIST_ENTRY(stf_softc) sc_list; /* all stf's are linked */ 132}; 133 134static LIST_HEAD(, stf_softc) stf_softc_list; 135 136static MALLOC_DEFINE(M_STF, STFNAME, "6to4 Tunnel Interface"); 137static int ip_stf_ttl = 40; 138 139extern struct domain inetdomain; 140struct protosw in_stf_protosw = 141{ SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR, 142 in_stf_input, (pr_output_t*)rip_output, 0, rip_ctloutput, 143 0, 144 0, 0, 0, 0, 145 &rip_usrreqs 146}; 147 148static int stfmodevent __P((module_t, int, void *)); 149static int stf_encapcheck __P((const struct mbuf *, int, int, void *)); 150static struct in6_ifaddr *stf_getsrcifa6 __P((struct ifnet *)); 151static int stf_output __P((struct ifnet *, struct mbuf *, struct sockaddr *, 152 struct rtentry *)); 153static int stf_checkaddr4 __P((struct stf_softc *, struct in_addr *, 154 struct ifnet *)); 155static int stf_checkaddr6 __P((struct stf_softc *, struct in6_addr *, 156 struct ifnet *)); 157static void stf_rtrequest __P((int, struct rtentry *, struct rt_addrinfo *)); 158static int stf_ioctl __P((struct ifnet *, u_long, caddr_t)); 159 160int stf_clone_create __P((struct if_clone *, int)); 161int stf_clone_destroy __P((struct ifnet *)); 162 163/* only one clone is currently allowed */ 164struct if_clone stf_cloner = 165 IF_CLONE_INITIALIZER(STFNAME, stf_clone_create, stf_clone_destroy, 0); 166 167int 168stf_clone_create(ifc, unit) 169 struct if_clone *ifc; 170 int unit; 171{ 172 struct stf_softc *sc; 173 174 sc = malloc(sizeof(struct stf_softc), M_STF, M_WAITOK | M_ZERO); 175 sc->sc_if.if_name = STFNAME; 176 sc->sc_if.if_unit = unit; 177 178 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 179 stf_encapcheck, &in_stf_protosw, sc); 180 if (sc->encap_cookie == NULL) { 181 printf("%s: attach failed\n", if_name(&sc->sc_if)); 182 free(sc, M_STF); 183 return (ENOMEM); 184 } 185 186 sc->sc_if.if_mtu = IPV6_MMTU; 187 sc->sc_if.if_ioctl = stf_ioctl; 188 sc->sc_if.if_output = stf_output; 189 sc->sc_if.if_type = IFT_STF; 190 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN; 191 if_attach(&sc->sc_if); 192 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 193 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 194 return (0); 195} 196 197int 198stf_clone_destroy(ifp) 199 struct ifnet *ifp; 200{ 201 int err; 202 struct stf_softc *sc = (void *) ifp; 203 204 LIST_REMOVE(sc, sc_list); 205 err = encap_detach(sc->encap_cookie); 206 KASSERT(err == 0, ("Unexpected error detaching encap_cookie")); 207 bpfdetach(ifp); 208 if_detach(ifp); 209 210 free(sc, M_STF); 211 return (0); 212} 213 214static int 215stfmodevent(mod, type, data) 216 module_t mod; 217 int type; 218 void *data; 219{ 220 221 switch (type) { 222 case MOD_LOAD: 223 LIST_INIT(&stf_softc_list); 224 if_clone_attach(&stf_cloner); 225 226 break; 227 case MOD_UNLOAD: 228 if_clone_detach(&stf_cloner); 229 230 while (!LIST_EMPTY(&stf_softc_list)) 231 stf_clone_destroy(&LIST_FIRST(&stf_softc_list)->sc_if); 232 break; 233 } 234 235 return (0); 236} 237 238static moduledata_t stf_mod = { 239 "if_stf", 240 stfmodevent, 241 0 242}; 243 244DECLARE_MODULE(if_stf, stf_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 245 246static int 247stf_encapcheck(m, off, proto, arg) 248 const struct mbuf *m; 249 int off; 250 int proto; 251 void *arg; 252{ 253 struct ip ip; 254 struct in6_ifaddr *ia6; 255 struct stf_softc *sc; 256 struct in_addr a, b; 257 258 sc = (struct stf_softc *)arg; 259 if (sc == NULL) 260 return 0; 261 262 if ((sc->sc_if.if_flags & IFF_UP) == 0) 263 return 0; 264 265 /* IFF_LINK0 means "no decapsulation" */ 266 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 267 return 0; 268 269 if (proto != IPPROTO_IPV6) 270 return 0; 271 272 /* LINTED const cast */ 273 m_copydata((struct mbuf *)(uintptr_t)m, 0, sizeof(ip), (caddr_t)&ip); 274 275 if (ip.ip_v != 4) 276 return 0; 277 278 ia6 = stf_getsrcifa6(&sc->sc_if); 279 if (ia6 == NULL) 280 return 0; 281 282 /* 283 * check if IPv4 dst matches the IPv4 address derived from the 284 * local 6to4 address. 285 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 286 */ 287 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 288 sizeof(ip.ip_dst)) != 0) 289 return 0; 290 291 /* 292 * check if IPv4 src matches the IPv4 address derived from the 293 * local 6to4 address masked by prefixmask. 294 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 295 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 296 */ 297 bzero(&a, sizeof(a)); 298 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 299 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 300 b = ip.ip_src; 301 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 302 if (a.s_addr != b.s_addr) 303 return 0; 304 305 /* stf interface makes single side match only */ 306 return 32; 307} 308 309static struct in6_ifaddr * 310stf_getsrcifa6(ifp) 311 struct ifnet *ifp; 312{ 313 struct ifaddr *ia; 314 struct in_ifaddr *ia4; 315 struct sockaddr_in6 *sin6; 316 struct in_addr in; 317 318 for (ia = TAILQ_FIRST(&ifp->if_addrlist); 319 ia; 320 ia = TAILQ_NEXT(ia, ifa_list)) 321 { 322 if (ia->ifa_addr == NULL) 323 continue; 324 if (ia->ifa_addr->sa_family != AF_INET6) 325 continue; 326 sin6 = (struct sockaddr_in6 *)ia->ifa_addr; 327 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 328 continue; 329 330 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 331 LIST_FOREACH(ia4, INADDR_HASH(in.s_addr), ia_hash) 332 if (ia4->ia_addr.sin_addr.s_addr == in.s_addr) 333 break; 334 if (ia4 == NULL) 335 continue; 336 337 return (struct in6_ifaddr *)ia; 338 } 339 340 return NULL; 341} 342 343static int 344stf_output(ifp, m, dst, rt) 345 struct ifnet *ifp; 346 struct mbuf *m; 347 struct sockaddr *dst; 348 struct rtentry *rt; 349{ 350 struct stf_softc *sc; 351 struct sockaddr_in6 *dst6; 352 struct in_addr *in4; 353 struct sockaddr_in *dst4; 354 u_int8_t tos; 355 struct ip *ip; 356 struct ip6_hdr *ip6; 357 struct in6_ifaddr *ia6; 358 359 sc = (struct stf_softc*)ifp; 360 dst6 = (struct sockaddr_in6 *)dst; 361 362 /* just in case */ 363 if ((ifp->if_flags & IFF_UP) == 0) { 364 m_freem(m); 365 return ENETDOWN; 366 } 367 368 /* 369 * If we don't have an ip4 address that match my inner ip6 address, 370 * we shouldn't generate output. Without this check, we'll end up 371 * using wrong IPv4 source. 372 */ 373 ia6 = stf_getsrcifa6(ifp); 374 if (ia6 == NULL) { 375 m_freem(m); 376 return ENETDOWN; 377 } 378 379 if (m->m_len < sizeof(*ip6)) { 380 m = m_pullup(m, sizeof(*ip6)); 381 if (!m) 382 return ENOBUFS; 383 } 384 ip6 = mtod(m, struct ip6_hdr *); 385 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 386 387 /* 388 * Pickup the right outer dst addr from the list of candidates. 389 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 390 */ 391 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 392 in4 = GET_V4(&ip6->ip6_dst); 393 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 394 in4 = GET_V4(&dst6->sin6_addr); 395 else { 396 m_freem(m); 397 return ENETUNREACH; 398 } 399 400#if NBPFILTER > 0 401 if (ifp->if_bpf) { 402 /* 403 * We need to prepend the address family as 404 * a four byte field. Cons up a dummy header 405 * to pacify bpf. This is safe because bpf 406 * will only read from the mbuf (i.e., it won't 407 * try to free it or keep a pointer a to it). 408 */ 409 struct mbuf m0; 410 u_int32_t af = AF_INET6; 411 412 m0.m_next = m; 413 m0.m_len = 4; 414 m0.m_data = (char *)⁡ 415 416#ifdef HAVE_OLD_BPF 417 bpf_mtap(ifp, &m0); 418#else 419 bpf_mtap(ifp->if_bpf, &m0); 420#endif 421 } 422#endif /*NBPFILTER > 0*/ 423 424 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 425 if (m && m->m_len < sizeof(struct ip)) 426 m = m_pullup(m, sizeof(struct ip)); 427 if (m == NULL) 428 return ENOBUFS; 429 ip = mtod(m, struct ip *); 430 431 bzero(ip, sizeof(*ip)); 432 433 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 434 &ip->ip_src, sizeof(ip->ip_src)); 435 bcopy(in4, &ip->ip_dst, sizeof(ip->ip_dst)); 436 ip->ip_p = IPPROTO_IPV6; 437 ip->ip_ttl = ip_stf_ttl; 438 ip->ip_len = m->m_pkthdr.len; /*host order*/ 439 if (ifp->if_flags & IFF_LINK1) 440 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 441 else 442 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 443 444 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst; 445 if (dst4->sin_family != AF_INET || 446 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) { 447 /* cache route doesn't match */ 448 dst4->sin_family = AF_INET; 449 dst4->sin_len = sizeof(struct sockaddr_in); 450 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr)); 451 if (sc->sc_ro.ro_rt) { 452 RTFREE(sc->sc_ro.ro_rt); 453 sc->sc_ro.ro_rt = NULL; 454 } 455 } 456 457 if (sc->sc_ro.ro_rt == NULL) { 458 rtalloc(&sc->sc_ro); 459 if (sc->sc_ro.ro_rt == NULL) { 460 m_freem(m); 461 return ENETUNREACH; 462 } 463 } 464 465 return ip_output(m, NULL, &sc->sc_ro, 0, NULL); 466} 467 468static int 469stf_checkaddr4(sc, in, inifp) 470 struct stf_softc *sc; 471 struct in_addr *in; 472 struct ifnet *inifp; /* incoming interface */ 473{ 474 struct in_ifaddr *ia4; 475 476 /* 477 * reject packets with the following address: 478 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 479 */ 480 if (IN_MULTICAST(ntohl(in->s_addr))) 481 return -1; 482 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 483 case 0: case 127: case 255: 484 return -1; 485 } 486 487 /* 488 * reject packets with broadcast 489 */ 490 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 491 ia4; 492 ia4 = TAILQ_NEXT(ia4, ia_link)) 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 bzero(&sin, 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, 0UL); 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 528static int 529stf_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 552void 553in_stf_input(m, off) 554 struct mbuf *m; 555 int off; 556{ 557 int proto; 558 struct stf_softc *sc; 559 struct ip *ip; 560 struct ip6_hdr *ip6; 561 u_int8_t otos, itos; 562 int len, isr; 563 struct ifqueue *ifq = NULL; 564 struct ifnet *ifp; 565 566 proto = mtod(m, struct ip *)->ip_p; 567 568 if (proto != IPPROTO_IPV6) { 569 m_freem(m); 570 return; 571 } 572 573 ip = mtod(m, struct ip *); 574 575 sc = (struct stf_softc *)encap_getarg(m); 576 577 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 578 m_freem(m); 579 return; 580 } 581 582 ifp = &sc->sc_if; 583 584 /* 585 * perform sanity check against outer src/dst. 586 * for source, perform ingress filter as well. 587 */ 588 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 589 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 590 m_freem(m); 591 return; 592 } 593 594 otos = ip->ip_tos; 595 m_adj(m, off); 596 597 if (m->m_len < sizeof(*ip6)) { 598 m = m_pullup(m, sizeof(*ip6)); 599 if (!m) 600 return; 601 } 602 ip6 = mtod(m, struct ip6_hdr *); 603 604 /* 605 * perform sanity check against inner src/dst. 606 * for source, perform ingress filter as well. 607 */ 608 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 609 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 610 m_freem(m); 611 return; 612 } 613 614 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 615 if ((ifp->if_flags & IFF_LINK1) != 0) 616 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 617 else 618 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 619 ip6->ip6_flow &= ~htonl(0xff << 20); 620 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 621 622 m->m_pkthdr.rcvif = ifp; 623 624 if (ifp->if_bpf) { 625 /* 626 * We need to prepend the address family as 627 * a four byte field. Cons up a dummy header 628 * to pacify bpf. This is safe because bpf 629 * will only read from the mbuf (i.e., it won't 630 * try to free it or keep a pointer a to it). 631 */ 632 struct mbuf m0; 633 u_int32_t af = AF_INET6; 634 635 m0.m_next = m; 636 m0.m_len = 4; 637 m0.m_data = (char *)⁡ 638 639#ifdef HAVE_OLD_BPF 640 bpf_mtap(ifp, &m0); 641#else 642 bpf_mtap(ifp->if_bpf, &m0); 643#endif 644 } 645 646 /* 647 * Put the packet to the network layer input queue according to the 648 * specified address family. 649 * See net/if_gif.c for possible issues with packet processing 650 * reorder due to extra queueing. 651 */ 652 ifq = &ip6intrq; 653 isr = NETISR_IPV6; 654 655 len = m->m_pkthdr.len; 656 if (! IF_HANDOFF(ifq, m, NULL)) 657 return; 658 schednetisr(isr); 659 ifp->if_ipackets++; 660 ifp->if_ibytes += len; 661} 662 663/* ARGSUSED */ 664static void 665stf_rtrequest(cmd, rt, info) 666 int cmd; 667 struct rtentry *rt; 668 struct rt_addrinfo *info; 669{ 670 671 if (rt) 672 rt->rt_rmx.rmx_mtu = IPV6_MMTU; 673} 674 675static int 676stf_ioctl(ifp, cmd, data) 677 struct ifnet *ifp; 678 u_long cmd; 679 caddr_t data; 680{ 681 struct ifaddr *ifa; 682 struct ifreq *ifr; 683 struct sockaddr_in6 *sin6; 684 int error; 685 686 error = 0; 687 switch (cmd) { 688 case SIOCSIFADDR: 689 ifa = (struct ifaddr *)data; 690 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 691 error = EAFNOSUPPORT; 692 break; 693 } 694 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 695 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) { 696 ifa->ifa_rtrequest = stf_rtrequest; 697 ifp->if_flags |= IFF_UP; 698 } else 699 error = EINVAL; 700 break; 701 702 case SIOCADDMULTI: 703 case SIOCDELMULTI: 704 ifr = (struct ifreq *)data; 705 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 706 ; 707 else 708 error = EAFNOSUPPORT; 709 break; 710 711 default: 712 error = EINVAL; 713 break; 714 } 715 716 return error; 717} 718