1 /* $FreeBSD: src/sys/net/if_stf.c,v 1.1.2.11 2003/01/23 21:06:44 sam Exp $ */ 2 /* $DragonFly: src/sys/net/stf/if_stf.c,v 1.25 2008/10/27 02:56:30 sephe Exp $ */ 3 /* $KAME: if_stf.c,v 1.73 2001/12/03 11:08:30 keiichi Exp $ */ 4 5 /* 6 * Copyright (C) 2000 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /* 35 * 6to4 interface, based on RFC3056. 36 * 37 * 6to4 interface is NOT capable of link-layer (I mean, IPv4) multicasting. 38 * There is no address mapping defined from IPv6 multicast address to IPv4 39 * address. Therefore, we do not have IFF_MULTICAST on the interface. 40 * 41 * Due to the lack of address mapping for link-local addresses, we cannot 42 * throw packets toward link-local addresses (fe80::x). Also, we cannot throw 43 * packets to link-local multicast addresses (ff02::x). 44 * 45 * Here are interesting symptoms due to the lack of link-local address: 46 * 47 * Unicast routing exchange: 48 * - RIPng: Impossible. Uses link-local multicast packet toward ff02::9, 49 * and link-local addresses as nexthop. 50 * - OSPFv6: Impossible. OSPFv6 assumes that there's link-local address 51 * assigned to the link, and makes use of them. Also, HELLO packets use 52 * link-local multicast addresses (ff02::5 and ff02::6). 53 * - BGP4+: Maybe. You can only use global address as nexthop, and global 54 * address as TCP endpoint address. 55 * 56 * Multicast routing protocols: 57 * - PIM: Hello packet cannot be used to discover adjacent PIM routers. 58 * Adjacent PIM routers must be configured manually (is it really spec-wise 59 * correct thing to do?). 60 * 61 * ICMPv6: 62 * - Redirects cannot be used due to the lack of link-local address. 63 * 64 * stf interface does not have, and will not need, a link-local address. 65 * It seems to have no real benefit and does not help the above symptoms much. 66 * Even if we assign link-locals to interface, we cannot really 67 * use link-local unicast/multicast on top of 6to4 cloud (since there's no 68 * encapsulation defined for link-local address), and the above analysis does 69 * not change. RFC3056 does not mandate the assignment of link-local address 70 * either. 71 * 72 * 6to4 interface has security issues. Refer to 73 * http://playground.iijlab.net/i-d/draft-itojun-ipv6-transition-abuse-00.txt 74 * for details. The code tries to filter out some of malicious packets. 75 * Note that there is no way to be 100% secure. 76 */ 77 78 #include "opt_inet.h" 79 #include "opt_inet6.h" 80 81 #include <sys/param.h> 82 #include <sys/systm.h> 83 #include <sys/socket.h> 84 #include <sys/sockio.h> 85 #include <sys/mbuf.h> 86 #include <sys/errno.h> 87 #include <sys/protosw.h> 88 #include <sys/kernel.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/ifq_var.h> 98 #include "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_var.h> 109 #include <netinet/ip_ecn.h> 110 111 #include <netinet/ip_encap.h> 112 113 #include <machine/stdarg.h> 114 115 #include <net/net_osdep.h> 116 117 #include <net/bpf.h> 118 119 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 120 #define GET_V4(x) ((struct in_addr *)(&(x)->s6_addr16[1])) 121 122 struct stf_softc { 123 struct ifnet sc_if; /* common area */ 124 union { 125 struct route __sc_ro4; 126 struct route_in6 __sc_ro6; /* just for safety */ 127 } __sc_ro46; 128 #define sc_ro __sc_ro46.__sc_ro4 129 const struct encaptab *encap_cookie; 130 }; 131 132 static struct stf_softc *stf; 133 134 static MALLOC_DEFINE(M_STF, "stf", "6to4 Tunnel Interface"); 135 static int ip_stf_ttl = 40; 136 137 extern struct domain inetdomain; 138 struct protosw in_stf_protosw = 139 { 140 .pr_type = SOCK_RAW, 141 .pr_domain = &inetdomain, 142 .pr_protocol = IPPROTO_IPV6, 143 .pr_flags = PR_ATOMIC|PR_ADDR, 144 145 .pr_input = in_stf_input, 146 .pr_output = rip_output, 147 .pr_ctlinput = NULL, 148 .pr_ctloutput = rip_ctloutput, 149 150 .pr_usrreqs = &rip_usrreqs 151 }; 152 153 static int stfmodevent (module_t, int, void *); 154 static int stf_encapcheck (const struct mbuf *, int, int, void *); 155 static struct in6_ifaddr *stf_getsrcifa6 (struct ifnet *); 156 static int stf_output (struct ifnet *, struct mbuf *, struct sockaddr *, 157 struct rtentry *); 158 static int stf_checkaddr4 (struct stf_softc *, struct in_addr *, 159 struct ifnet *); 160 static int stf_checkaddr6 (struct stf_softc *, struct in6_addr *, 161 struct ifnet *); 162 static void stf_rtrequest (int, struct rtentry *); 163 static int stf_ioctl (struct ifnet *, u_long, caddr_t, struct ucred *); 164 165 static int 166 stfmodevent(module_t mod, int type, void *data) 167 { 168 struct stf_softc *sc; 169 int err; 170 const struct encaptab *p; 171 172 switch (type) { 173 case MOD_LOAD: 174 stf = kmalloc(sizeof(struct stf_softc), M_STF, 175 M_WAITOK | M_ZERO); 176 sc = stf; 177 178 bzero(sc, sizeof(*sc)); 179 if_initname(&(sc->sc_if), "stf", 0); 180 181 p = encap_attach_func(AF_INET, IPPROTO_IPV6, stf_encapcheck, 182 (void *)&in_stf_protosw, sc); 183 if (p == NULL) { 184 kprintf("%s: attach failed\n", if_name(&sc->sc_if)); 185 return (ENOMEM); 186 } 187 sc->encap_cookie = p; 188 189 sc->sc_if.if_mtu = IPV6_MMTU; 190 sc->sc_if.if_flags = 0; 191 sc->sc_if.if_ioctl = stf_ioctl; 192 sc->sc_if.if_output = stf_output; 193 sc->sc_if.if_type = IFT_STF; 194 #if 0 195 /* turn off ingress filter */ 196 sc->sc_if.if_flags |= IFF_LINK2; 197 #endif 198 ifq_set_maxlen(&sc->sc_if.if_snd, IFQ_MAXLEN); 199 if_attach(&sc->sc_if, NULL); 200 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 201 break; 202 case MOD_UNLOAD: 203 sc = stf; 204 bpfdetach(&sc->sc_if); 205 if_detach(&sc->sc_if); 206 err = encap_detach(sc->encap_cookie); 207 KASSERT(err == 0, ("Unexpected error detaching encap_cookie")); 208 kfree(sc, M_STF); 209 break; 210 } 211 212 return (0); 213 } 214 215 static moduledata_t stf_mod = { 216 "if_stf", 217 stfmodevent, 218 0 219 }; 220 221 DECLARE_MODULE(if_stf, stf_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 222 223 static int 224 stf_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 225 { 226 struct ip ip; 227 struct in6_ifaddr *ia6; 228 struct stf_softc *sc; 229 struct in_addr a, b; 230 231 sc = (struct stf_softc *)arg; 232 if (sc == NULL) 233 return 0; 234 235 if ((sc->sc_if.if_flags & IFF_UP) == 0) 236 return 0; 237 238 /* IFF_LINK0 means "no decapsulation" */ 239 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 240 return 0; 241 242 if (proto != IPPROTO_IPV6) 243 return 0; 244 245 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip); 246 247 if (ip.ip_v != 4) 248 return 0; 249 250 ia6 = stf_getsrcifa6(&sc->sc_if); 251 if (ia6 == NULL) 252 return 0; 253 254 /* 255 * check if IPv4 dst matches the IPv4 address derived from the 256 * local 6to4 address. 257 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 258 */ 259 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 260 sizeof(ip.ip_dst)) != 0) 261 return 0; 262 263 /* 264 * check if IPv4 src matches the IPv4 address derived from the 265 * local 6to4 address masked by prefixmask. 266 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 267 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 268 */ 269 bzero(&a, sizeof(a)); 270 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 271 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 272 b = ip.ip_src; 273 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 274 if (a.s_addr != b.s_addr) 275 return 0; 276 277 /* stf interface makes single side match only */ 278 return 32; 279 } 280 281 static struct in6_ifaddr * 282 stf_getsrcifa6(struct ifnet *ifp) 283 { 284 struct ifaddr_container *ifac; 285 struct sockaddr_in6 *sin6; 286 struct in_addr in; 287 288 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 289 struct ifaddr *ia = ifac->ifa; 290 struct in_ifaddr_container *iac; 291 292 if (ia->ifa_addr == NULL) 293 continue; 294 if (ia->ifa_addr->sa_family != AF_INET6) 295 continue; 296 sin6 = (struct sockaddr_in6 *)ia->ifa_addr; 297 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 298 continue; 299 300 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 301 LIST_FOREACH(iac, INADDR_HASH(in.s_addr), ia_hash) { 302 if (iac->ia->ia_addr.sin_addr.s_addr == in.s_addr) 303 break; 304 } 305 if (iac == NULL) 306 continue; 307 308 return (struct in6_ifaddr *)ia; 309 } 310 311 return NULL; 312 } 313 314 static int 315 stf_output_serialized(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 316 struct rtentry *rt) 317 { 318 struct stf_softc *sc; 319 struct sockaddr_in6 *dst6; 320 struct in_addr *in4; 321 struct sockaddr_in *dst4; 322 u_int8_t tos; 323 struct ip *ip; 324 struct ip6_hdr *ip6; 325 struct in6_ifaddr *ia6; 326 static const uint32_t af = AF_INET6; 327 328 sc = (struct stf_softc*)ifp; 329 dst6 = (struct sockaddr_in6 *)dst; 330 331 /* just in case */ 332 if ((ifp->if_flags & IFF_UP) == 0) { 333 m_freem(m); 334 return ENETDOWN; 335 } 336 337 /* 338 * If we don't have an ip4 address that match my inner ip6 address, 339 * we shouldn't generate output. Without this check, we'll end up 340 * using wrong IPv4 source. 341 */ 342 ia6 = stf_getsrcifa6(ifp); 343 if (ia6 == NULL) { 344 m_freem(m); 345 return ENETDOWN; 346 } 347 348 if (m->m_len < sizeof(*ip6)) { 349 m = m_pullup(m, sizeof(*ip6)); 350 if (!m) 351 return ENOBUFS; 352 } 353 ip6 = mtod(m, struct ip6_hdr *); 354 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 355 356 /* 357 * Pickup the right outer dst addr from the list of candidates. 358 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 359 */ 360 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 361 in4 = GET_V4(&ip6->ip6_dst); 362 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 363 in4 = GET_V4(&dst6->sin6_addr); 364 else { 365 m_freem(m); 366 return ENETUNREACH; 367 } 368 369 if (ifp->if_bpf) { 370 bpf_gettoken(); 371 if (ifp->if_bpf) 372 bpf_ptap(ifp->if_bpf, m, &af, sizeof(af)); 373 bpf_reltoken(); 374 } 375 376 M_PREPEND(m, sizeof(struct ip), MB_DONTWAIT); 377 if (m && m->m_len < sizeof(struct ip)) 378 m = m_pullup(m, sizeof(struct ip)); 379 if (m == NULL) 380 return ENOBUFS; 381 ip = mtod(m, struct ip *); 382 383 bzero(ip, sizeof(*ip)); 384 385 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 386 &ip->ip_src, sizeof(ip->ip_src)); 387 bcopy(in4, &ip->ip_dst, sizeof(ip->ip_dst)); 388 ip->ip_p = IPPROTO_IPV6; 389 ip->ip_ttl = ip_stf_ttl; 390 ip->ip_len = m->m_pkthdr.len; /*host order*/ 391 if (ifp->if_flags & IFF_LINK1) 392 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 393 else 394 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 395 396 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst; 397 if (dst4->sin_family != AF_INET || 398 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) { 399 /* cache route doesn't match */ 400 dst4->sin_family = AF_INET; 401 dst4->sin_len = sizeof(struct sockaddr_in); 402 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr)); 403 if (sc->sc_ro.ro_rt) { 404 RTFREE(sc->sc_ro.ro_rt); 405 sc->sc_ro.ro_rt = NULL; 406 } 407 } 408 409 if (sc->sc_ro.ro_rt == NULL) { 410 rtalloc(&sc->sc_ro); 411 if (sc->sc_ro.ro_rt == NULL) { 412 m_freem(m); 413 return ENETUNREACH; 414 } 415 } 416 417 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 418 } 419 420 static int 421 stf_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 422 struct rtentry *rt) 423 { 424 struct ifaltq_subque *ifsq = ifq_get_subq_default(&ifp->if_snd); 425 int error; 426 427 ifsq_serialize_hw(ifsq); 428 error = stf_output_serialized(ifp, m, dst, rt); 429 ifsq_deserialize_hw(ifsq); 430 431 return error; 432 } 433 434 /* 435 * Parameters: 436 * inifp: incoming interface 437 */ 438 static int 439 stf_checkaddr4(struct stf_softc *sc, struct in_addr *in, struct ifnet *inifp) 440 { 441 struct in_ifaddr_container *iac; 442 443 /* 444 * reject packets with the following address: 445 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 446 */ 447 if (IN_MULTICAST(ntohl(in->s_addr))) 448 return -1; 449 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 450 case 0: case 127: case 255: 451 return -1; 452 } 453 454 /* 455 * reject packets with broadcast 456 */ 457 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 458 struct in_ifaddr *ia4 = iac->ia; 459 460 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 461 continue; 462 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 463 return -1; 464 } 465 466 /* 467 * perform ingress filter 468 */ 469 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 470 struct sockaddr_in sin; 471 struct rtentry *rt; 472 473 bzero(&sin, sizeof(sin)); 474 sin.sin_family = AF_INET; 475 sin.sin_len = sizeof(struct sockaddr_in); 476 sin.sin_addr = *in; 477 rt = rtpurelookup((struct sockaddr *)&sin); 478 if (!rt || rt->rt_ifp != inifp) { 479 #if 0 480 log(LOG_WARNING, "%s: packet from 0x%x dropped " 481 "due to ingress filter\n", if_name(&sc->sc_if), 482 (u_int32_t)ntohl(sin.sin_addr.s_addr)); 483 #endif 484 if (rt) 485 rtfree(rt); 486 return -1; 487 } 488 rtfree(rt); 489 } 490 491 return 0; 492 } 493 494 /* 495 * Parameters: 496 * inifp: incoming interface 497 */ 498 static int 499 stf_checkaddr6(struct stf_softc *sc, struct in6_addr *in6, struct ifnet *inifp) 500 { 501 /* 502 * check 6to4 addresses 503 */ 504 if (IN6_IS_ADDR_6TO4(in6)) 505 return stf_checkaddr4(sc, GET_V4(in6), inifp); 506 507 /* 508 * reject anything that look suspicious. the test is implemented 509 * in ip6_input too, but we check here as well to 510 * (1) reject bad packets earlier, and 511 * (2) to be safe against future ip6_input change. 512 */ 513 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 514 return -1; 515 516 return 0; 517 } 518 519 int 520 in_stf_input(struct mbuf **mp, int *offp, int proto) 521 { 522 struct mbuf *m; 523 struct stf_softc *sc; 524 struct ip *ip; 525 struct ip6_hdr *ip6; 526 u_int8_t otos, itos; 527 struct ifnet *ifp; 528 int off; 529 static const uint32_t af = AF_INET6; 530 531 m = *mp; 532 off = *offp; 533 534 if (proto != IPPROTO_IPV6) { 535 m_freem(m); 536 return(IPPROTO_DONE); 537 } 538 539 ip = mtod(m, struct ip *); 540 541 sc = (struct stf_softc *)encap_getarg(m); 542 543 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 544 m_freem(m); 545 return(IPPROTO_DONE); 546 } 547 548 ifp = &sc->sc_if; 549 550 /* 551 * perform sanity check against outer src/dst. 552 * for source, perform ingress filter as well. 553 */ 554 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 555 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 556 m_freem(m); 557 return(IPPROTO_DONE); 558 } 559 560 otos = ip->ip_tos; 561 m_adj(m, off); 562 563 if (m->m_len < sizeof(*ip6)) { 564 m = m_pullup(m, sizeof(*ip6)); 565 if (!m) 566 return(IPPROTO_DONE); 567 } 568 ip6 = mtod(m, struct ip6_hdr *); 569 570 /* 571 * perform sanity check against inner src/dst. 572 * for source, perform ingress filter as well. 573 */ 574 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 575 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 576 m_freem(m); 577 return(IPPROTO_DONE); 578 } 579 580 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 581 if ((ifp->if_flags & IFF_LINK1) != 0) 582 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 583 else 584 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 585 ip6->ip6_flow &= ~htonl(0xff << 20); 586 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 587 588 m->m_pkthdr.rcvif = ifp; 589 590 if (ifp->if_bpf) { 591 bpf_gettoken(); 592 if (ifp->if_bpf) 593 bpf_ptap(ifp->if_bpf, m, &af, sizeof(af)); 594 bpf_reltoken(); 595 } 596 597 /* 598 * Put the packet to the network layer input queue according to the 599 * specified address family. 600 * See net/if_gif.c for possible issues with packet processing 601 * reorder due to extra queueing. 602 */ 603 IFNET_STAT_INC(ifp, ipackets, 1); 604 IFNET_STAT_INC(ifp, ibytes, m->m_pkthdr.len); 605 netisr_queue(NETISR_IPV6, m); 606 return(IPPROTO_DONE); 607 } 608 609 /* ARGSUSED */ 610 static void 611 stf_rtrequest(int cmd, struct rtentry *rt) 612 { 613 614 if (rt) 615 rt->rt_rmx.rmx_mtu = IPV6_MMTU; 616 } 617 618 static int 619 stf_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr) 620 { 621 struct ifaddr *ifa; 622 struct ifreq *ifr; 623 struct sockaddr_in6 *sin6; 624 int error; 625 626 error = 0; 627 switch (cmd) { 628 case SIOCSIFADDR: 629 ifa = (struct ifaddr *)data; 630 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 631 error = EAFNOSUPPORT; 632 break; 633 } 634 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 635 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) { 636 ifa->ifa_rtrequest = stf_rtrequest; 637 ifp->if_flags |= IFF_UP; 638 } else 639 error = EINVAL; 640 break; 641 642 case SIOCADDMULTI: 643 case SIOCDELMULTI: 644 ifr = (struct ifreq *)data; 645 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 646 ; 647 else 648 error = EAFNOSUPPORT; 649 break; 650 651 default: 652 error = EINVAL; 653 break; 654 } 655 656 return error; 657 } 658