if_stf.c revision 1.1
1 /* $NetBSD: if_stf.c,v 1.1 2000/04/19 06:30:53 itojun Exp $ */ 2 /* $KAME: if_stf.c,v 1.31 2000/04/19 05:51:20 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-6to4-03.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::2, 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 * 04 draft suggests to have link-local address onto 6to4 interface. 64 * However, it seems to have no real use and does not help the above symptom 65 * much. 66 * 67 * 6to4 interface has security issues. Refer to 68 * http://playground.iijlab.net/i-d/draft-itojun-ipv6-transition-abuse-00.txt 69 * for details. The code tries to filter out some of malicious packets. 70 * Note that there is no way to be 100% secure. 71 */ 72 73 #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__) 74 #include "opt_inet.h" 75 #endif 76 77 #include <sys/param.h> 78 #include <sys/systm.h> 79 #include <sys/socket.h> 80 #include <sys/sockio.h> 81 #include <sys/mbuf.h> 82 #include <sys/errno.h> 83 #if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) 84 #include <sys/ioctl.h> 85 #endif 86 #include <sys/protosw.h> 87 #ifdef __FreeBSD__ 88 #include <sys/kernel.h> 89 #endif 90 #include <machine/cpu.h> 91 92 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 93 #include <sys/malloc.h> 94 #endif 95 96 #include <net/if.h> 97 #include <net/route.h> 98 #include <net/netisr.h> 99 #include <net/if_types.h> 100 #include <net/if_stf.h> 101 102 #include <netinet/in.h> 103 #include <netinet/in_systm.h> 104 #include <netinet/ip.h> 105 #include <netinet/ip_var.h> 106 #include <netinet/in_var.h> 107 108 #include <netinet/ip6.h> 109 #include <netinet6/ip6_var.h> 110 #include <netinet6/in6_gif.h> 111 #include <netinet6/in6_var.h> 112 #include <netinet/ip_ecn.h> 113 114 #include <netinet/ip_encap.h> 115 116 #include <machine/stdarg.h> 117 118 #include <net/net_osdep.h> 119 120 #include "bpfilter.h" 121 #include "stf.h" 122 #include "gif.h" /*XXX*/ 123 124 #if NBPFILTER > 0 125 #include <net/bpf.h> 126 #endif 127 128 #if NGIF > 0 129 #include <net/if_gif.h> 130 #endif 131 132 #if NSTF > 0 133 #if NSTF != 1 134 # error only single stf interface allowed 135 #endif 136 137 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 138 #define GET_V4(x) ((struct in_addr *)(&(x)->s6_addr16[1])) 139 140 struct stf_softc { 141 struct ifnet sc_if; /* common area */ 142 union { 143 struct route __sc_ro4; 144 struct route_in6 __sc_ro6; /* just for safety */ 145 } __sc_ro46; 146 #define sc_ro __sc_ro46.__sc_ro4 147 const struct encaptab *encap_cookie; 148 }; 149 150 static struct stf_softc *stf; 151 static int nstf; 152 153 #if NGIF > 0 154 extern int ip_gif_ttl; /*XXX*/ 155 #else 156 static int ip_gif_ttl = 40; /*XXX*/ 157 #endif 158 159 extern struct protosw in_stf_protosw; 160 161 #ifdef __FreeBSD__ 162 void stfattach __P((void *)); 163 #else 164 void stfattach __P((int)); 165 #endif 166 static int stf_encapcheck __P((const struct mbuf *, int, int, void *)); 167 static struct in6_ifaddr *stf_getsrcifa6 __P((struct ifnet *)); 168 static int stf_output __P((struct ifnet *, struct mbuf *, struct sockaddr *, 169 struct rtentry *)); 170 static int stf_checkaddr4 __P((struct in_addr *, struct ifnet *)); 171 static int stf_checkaddr6 __P((struct in6_addr *, struct ifnet *)); 172 #if defined(__bsdi__) && _BSDI_VERSION >= 199802 173 static void stf_rtrequest __P((int, struct rtentry *, struct rt_addrinfo *)); 174 #else 175 static void stf_rtrequest __P((int, struct rtentry *, struct sockaddr *)); 176 #endif 177 #if defined(__FreeBSD__) && __FreeBSD__ < 3 178 static int stf_ioctl __P((struct ifnet *, int, caddr_t)); 179 #else 180 static int stf_ioctl __P((struct ifnet *, u_long, caddr_t)); 181 #endif 182 183 void 184 stfattach(dummy) 185 #ifdef __FreeBSD__ 186 void *dummy; 187 #else 188 int dummy; 189 #endif 190 { 191 struct stf_softc *sc; 192 int i; 193 const struct encaptab *p; 194 195 #ifdef __NetBSD__ 196 nstf = dummy; 197 #else 198 nstf = NSTF; 199 #endif 200 stf = malloc(nstf * sizeof(struct stf_softc), M_DEVBUF, M_WAIT); 201 bzero(stf, nstf * sizeof(struct stf_softc)); 202 sc = stf; 203 204 /* XXX just in case... */ 205 for (i = 0; i < nstf; i++) { 206 sc = &stf[i]; 207 bzero(sc, sizeof(*sc)); 208 #if defined(__NetBSD__) || defined(__OpenBSD__) 209 sprintf(sc->sc_if.if_xname, "stf%d", i); 210 #else 211 sc->sc_if.if_name = "stf"; 212 sc->sc_if.if_unit = i; 213 #endif 214 215 p = encap_attach_func(AF_INET, IPPROTO_IPV6, stf_encapcheck, 216 &in_stf_protosw, sc); 217 if (p == NULL) { 218 printf("%s: attach failed\n", if_name(&sc->sc_if)); 219 continue; 220 } 221 sc->encap_cookie = p; 222 223 sc->sc_if.if_mtu = IPV6_MMTU; 224 sc->sc_if.if_flags = 0; 225 sc->sc_if.if_ioctl = stf_ioctl; 226 sc->sc_if.if_output = stf_output; 227 sc->sc_if.if_type = IFT_STF; 228 if_attach(&sc->sc_if); 229 #if NBPFILTER > 0 230 #ifdef HAVE_OLD_BPF 231 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 232 #else 233 bpfattach(&sc->sc_if.if_bpf, &sc->sc_if, DLT_NULL, sizeof(u_int)); 234 #endif 235 #endif 236 } 237 } 238 239 #ifdef __FreeBSD__ 240 PSEUDO_SET(stfattach, if_stf); 241 #endif 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 if (proto != IPPROTO_IPV6) 263 return 0; 264 265 /* LINTED const cast */ 266 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); 267 268 if (ip.ip_v != 4) 269 return 0; 270 271 ia6 = stf_getsrcifa6(&sc->sc_if); 272 if (ia6 == NULL) 273 return 0; 274 275 /* 276 * check if IPv4 dst matches the IPv4 address derived from the 277 * local 6to4 address. 278 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 279 */ 280 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 281 sizeof(ip.ip_dst)) != 0) 282 return 0; 283 284 /* 285 * check if IPv4 src matches the IPv4 address derived from the 286 * local 6to4 address masked by prefixmask. 287 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 288 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 289 */ 290 bzero(&a, sizeof(a)); 291 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 292 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 293 b = ip.ip_src; 294 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 295 if (a.s_addr != b.s_addr) 296 return 0; 297 298 /* stf interface makes single side match only */ 299 return 32; 300 } 301 302 static struct in6_ifaddr * 303 stf_getsrcifa6(ifp) 304 struct ifnet *ifp; 305 { 306 struct ifaddr *ia; 307 struct in_ifaddr *ia4; 308 struct sockaddr_in6 *sin6; 309 struct in_addr in; 310 311 #if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3) 312 for (ia = ifp->if_addrlist; ia; ia = ia->ifa_next) 313 #else 314 for (ia = ifp->if_addrlist.tqh_first; 315 ia; 316 ia = ia->ifa_list.tqe_next) 317 #endif 318 { 319 if (ia->ifa_addr == NULL) 320 continue; 321 if (ia->ifa_addr->sa_family != AF_INET6) 322 continue; 323 sin6 = (struct sockaddr_in6 *)ia->ifa_addr; 324 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 325 continue; 326 327 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 328 #ifdef __NetBSD__ 329 INADDR_TO_IA(in, ia4); 330 #else 331 #ifdef __OpenBSD__ 332 for (ia4 = in_ifaddr.tqh_first; 333 ia4; 334 ia4 = ia4->ia_list.tqe_next) 335 #else 336 for (ia4 = in_ifaddr; ia4 != NULL; ia4 = ia4->ia_next) 337 #endif 338 { 339 if (ia4->ia_addr.sin_addr.s_addr == in.s_addr) 340 break; 341 } 342 #endif 343 if (ia4 == NULL) 344 continue; 345 346 return (struct in6_ifaddr *)ia; 347 } 348 349 return NULL; 350 } 351 352 static int 353 stf_output(ifp, m, dst, rt) 354 struct ifnet *ifp; 355 struct mbuf *m; 356 struct sockaddr *dst; 357 struct rtentry *rt; 358 { 359 struct stf_softc *sc; 360 struct sockaddr_in6 *dst6; 361 struct sockaddr_in *dst4; 362 u_int8_t tos; 363 struct ip *ip; 364 struct ip6_hdr *ip6; 365 struct in6_ifaddr *ia6; 366 367 sc = (struct stf_softc*)ifp; 368 dst6 = (struct sockaddr_in6 *)dst; 369 370 /* just in case */ 371 if ((ifp->if_flags & IFF_UP) == 0) { 372 m_freem(m); 373 return ENETDOWN; 374 } 375 376 /* 377 * If we don't have an ip4 address that match my inner ip6 address, 378 * we shouldn't generate output. Without this check, we'll end up 379 * using wrong IPv4 source. 380 */ 381 ia6 = stf_getsrcifa6(ifp); 382 if (ia6 == NULL) { 383 m_freem(m); 384 return ENETDOWN; 385 } 386 387 if (m->m_len < sizeof(*ip6)) { 388 m = m_pullup(m, sizeof(*ip6)); 389 if (!m) 390 return ENOBUFS; 391 } 392 ip6 = mtod(m, struct ip6_hdr *); 393 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 394 395 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 396 if (m && m->m_len < sizeof(struct ip)) 397 m = m_pullup(m, sizeof(struct ip)); 398 if (m == NULL) 399 return ENOBUFS; 400 ip = mtod(m, struct ip *); 401 402 bzero(ip, sizeof(*ip)); 403 404 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 405 &ip->ip_src, sizeof(ip->ip_src)); 406 bcopy(GET_V4(&dst6->sin6_addr), &ip->ip_dst, sizeof(ip->ip_dst)); 407 ip->ip_p = IPPROTO_IPV6; 408 ip->ip_ttl = ip_gif_ttl; /*XXX*/ 409 ip->ip_len = m->m_pkthdr.len; /*host order*/ 410 if (ifp->if_flags & IFF_LINK1) 411 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 412 413 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst; 414 if (dst4->sin_family != AF_INET || 415 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) { 416 /* cache route doesn't match */ 417 dst4->sin_family = AF_INET; 418 dst4->sin_len = sizeof(struct sockaddr_in); 419 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr)); 420 if (sc->sc_ro.ro_rt) { 421 RTFREE(sc->sc_ro.ro_rt); 422 sc->sc_ro.ro_rt = NULL; 423 } 424 } 425 426 if (sc->sc_ro.ro_rt == NULL) { 427 rtalloc(&sc->sc_ro); 428 if (sc->sc_ro.ro_rt == NULL) { 429 m_freem(m); 430 return ENETUNREACH; 431 } 432 } 433 434 #ifndef __OpenBSD__ 435 return ip_output(m, NULL, &sc->sc_ro, 0, NULL); 436 #else 437 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 438 #endif 439 } 440 441 static int 442 stf_checkaddr4(in, ifp) 443 struct in_addr *in; 444 struct ifnet *ifp; /* incoming interface */ 445 { 446 struct in_ifaddr *ia4; 447 448 /* 449 * reject packets with the following address: 450 * 224.0.0.0/4 0.0.0.0/32 255.255.255.255/32 451 */ 452 if (IN_MULTICAST(in->s_addr) || in->s_addr == INADDR_ANY || 453 in->s_addr == INADDR_BROADCAST) { 454 return -1; 455 } 456 457 /* 458 * reject packets with broadcast 459 */ 460 #if defined(__OpenBSD__) || defined(__NetBSD__) 461 for (ia4 = in_ifaddr.tqh_first; ia4; ia4 = ia4->ia_list.tqe_next) 462 #else 463 for (ia4 = in_ifaddr; ia4 != NULL; ia4 = ia4->ia_next) 464 #endif 465 { 466 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 467 continue; 468 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 469 return -1; 470 } 471 472 /* 473 * perform ingress filter 474 */ 475 if (ifp) { 476 struct sockaddr_in sin; 477 struct rtentry *rt; 478 479 bzero(&sin, sizeof(sin)); 480 sin.sin_family = AF_INET; 481 sin.sin_len = sizeof(struct sockaddr_in); 482 sin.sin_addr = *in; 483 #ifdef __FreeBSD__ 484 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 485 #else 486 rt = rtalloc1((struct sockaddr *)&sin, 0); 487 #endif 488 if (!rt) 489 return -1; 490 if (rt->rt_ifp != ifp) { 491 rtfree(rt); 492 return -1; 493 } 494 rtfree(rt); 495 } 496 497 return 0; 498 } 499 500 static int 501 stf_checkaddr6(in6, ifp) 502 struct in6_addr *in6; 503 struct ifnet *ifp; /* incoming interface */ 504 { 505 /* 506 * check 6to4 addresses 507 */ 508 if (IN6_IS_ADDR_6TO4(in6)) 509 return stf_checkaddr4(GET_V4(in6), ifp); 510 511 /* 512 * reject anything that look suspicious. the test is implemented 513 * in ip6_input too, but we check here as well to 514 * (1) reject bad packets earlier, and 515 * (2) to be safe against future ip6_input change. 516 */ 517 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 518 return -1; 519 520 return 0; 521 } 522 523 void 524 #if __STDC__ 525 in_stf_input(struct mbuf *m, ...) 526 #else 527 in_stf_input(m, va_alist) 528 register struct mbuf *m; 529 #endif 530 { 531 int off, proto; 532 struct stf_softc *sc; 533 struct ip *ip; 534 struct ip6_hdr *ip6; 535 u_int8_t otos, itos; 536 int s, isr; 537 struct ifqueue *ifq = NULL; 538 struct ifnet *ifp; 539 va_list ap; 540 541 va_start(ap, m); 542 off = va_arg(ap, int); 543 proto = va_arg(ap, int); 544 va_end(ap); 545 546 if (proto != IPPROTO_IPV6) { 547 m_freem(m); 548 return; 549 } 550 551 ip = mtod(m, struct ip *); 552 553 sc = (struct stf_softc *)encap_getarg(m); 554 555 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 556 m_freem(m); 557 return; 558 } 559 560 ifp = &sc->sc_if; 561 562 /* 563 * perform sanity check against outer src/dst. 564 * for source, perform ingress filter as well. 565 */ 566 if (stf_checkaddr4(&ip->ip_dst, NULL) < 0 || 567 stf_checkaddr4(&ip->ip_src, m->m_pkthdr.rcvif) < 0) { 568 m_freem(m); 569 return; 570 } 571 572 otos = ip->ip_tos; 573 m_adj(m, off); 574 575 if (m->m_len < sizeof(*ip6)) { 576 m = m_pullup(m, sizeof(*ip6)); 577 if (!m) 578 return; 579 } 580 ip6 = mtod(m, struct ip6_hdr *); 581 582 /* 583 * perform sanity check against inner src/dst. 584 * for source, perform ingress filter as well. 585 */ 586 if (stf_checkaddr6(&ip6->ip6_dst, NULL) < 0 || 587 stf_checkaddr6(&ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 588 m_freem(m); 589 return; 590 } 591 592 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 593 if ((ifp->if_flags & IFF_LINK1) != 0) 594 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 595 ip6->ip6_flow &= ~htonl(0xff << 20); 596 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 597 598 m->m_pkthdr.rcvif = ifp; 599 600 #if NBPFILTER > 0 601 if (ifp->if_bpf) { 602 /* 603 * We need to prepend the address family as 604 * a four byte field. Cons up a dummy header 605 * to pacify bpf. This is safe because bpf 606 * will only read from the mbuf (i.e., it won't 607 * try to free it or keep a pointer a to it). 608 */ 609 struct mbuf m0; 610 u_int af = AF_INET6; 611 612 m0.m_next = m; 613 m0.m_len = 4; 614 m0.m_data = (char *)⁡ 615 616 #ifdef HAVE_OLD_BPF 617 bpf_mtap(ifp, &m0); 618 #else 619 bpf_mtap(ifp->if_bpf, &m0); 620 #endif 621 } 622 #endif /*NBPFILTER > 0*/ 623 624 /* 625 * Put the packet to the network layer input queue according to the 626 * specified address family. 627 * See net/if_gif.c for possible issues with packet processing 628 * reorder due to extra queueing. 629 */ 630 ifq = &ip6intrq; 631 isr = NETISR_IPV6; 632 633 s = splimp(); 634 if (IF_QFULL(ifq)) { 635 IF_DROP(ifq); /* update statistics */ 636 m_freem(m); 637 splx(s); 638 return; 639 } 640 IF_ENQUEUE(ifq, m); 641 schednetisr(isr); 642 ifp->if_ipackets++; 643 ifp->if_ibytes += m->m_pkthdr.len; 644 splx(s); 645 } 646 647 /* ARGSUSED */ 648 static void 649 stf_rtrequest(cmd, rt, sa) 650 int cmd; 651 struct rtentry *rt; 652 #if defined(__bsdi__) && _BSDI_VERSION >= 199802 653 struct rt_addrinfo *sa; 654 #else 655 struct sockaddr *sa; 656 #endif 657 { 658 659 if (rt) 660 rt->rt_rmx.rmx_mtu = IPV6_MMTU; 661 } 662 663 static int 664 stf_ioctl(ifp, cmd, data) 665 struct ifnet *ifp; 666 #if defined(__FreeBSD__) && __FreeBSD__ < 3 667 int cmd; 668 #else 669 u_long cmd; 670 #endif 671 caddr_t data; 672 { 673 struct ifaddr *ifa; 674 struct ifreq *ifr; 675 struct sockaddr_in6 *sin6; 676 int error; 677 678 error = 0; 679 switch (cmd) { 680 case SIOCSIFADDR: 681 ifa = (struct ifaddr *)data; 682 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 683 error = EAFNOSUPPORT; 684 break; 685 } 686 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 687 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) { 688 ifa->ifa_rtrequest = stf_rtrequest; 689 ifp->if_flags |= IFF_UP; 690 } else 691 error = EINVAL; 692 break; 693 694 case SIOCADDMULTI: 695 case SIOCDELMULTI: 696 ifr = (struct ifreq *)data; 697 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 698 ; 699 else 700 error = EAFNOSUPPORT; 701 break; 702 703 default: 704 error = EINVAL; 705 break; 706 } 707 708 return error; 709 } 710 711 #endif /* NSTF > 0 */ 712
Indexes created Mon Sep 29 21:09:56 GMT 2025