if_stf.c revision 1.2
1 /* $NetBSD: if_stf.c,v 1.2 2000/04/21 02:40:53 itojun Exp $ */ 2 /* $KAME: if_stf.c,v 1.32 2000/04/21 02:39:43 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::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 * 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. Even if we assign link-locals to interface, we cannot really 66 * use link-local unicast/multicast on top of 6to4 cloud, and the above 67 * analysis does not change. 68 * 69 * 6to4 interface has security issues. Refer to 70 * http://playground.iijlab.net/i-d/draft-itojun-ipv6-transition-abuse-00.txt 71 * for details. The code tries to filter out some of malicious packets. 72 * Note that there is no way to be 100% secure. 73 */ 74 75 #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__) 76 #include "opt_inet.h" 77 #endif 78 79 #include <sys/param.h> 80 #include <sys/systm.h> 81 #include <sys/socket.h> 82 #include <sys/sockio.h> 83 #include <sys/mbuf.h> 84 #include <sys/errno.h> 85 #if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) 86 #include <sys/ioctl.h> 87 #endif 88 #include <sys/protosw.h> 89 #ifdef __FreeBSD__ 90 #include <sys/kernel.h> 91 #endif 92 #include <machine/cpu.h> 93 94 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 95 #include <sys/malloc.h> 96 #endif 97 98 #include <net/if.h> 99 #include <net/route.h> 100 #include <net/netisr.h> 101 #include <net/if_types.h> 102 #include <net/if_stf.h> 103 104 #include <netinet/in.h> 105 #include <netinet/in_systm.h> 106 #include <netinet/ip.h> 107 #include <netinet/ip_var.h> 108 #include <netinet/in_var.h> 109 110 #include <netinet/ip6.h> 111 #include <netinet6/ip6_var.h> 112 #include <netinet6/in6_gif.h> 113 #include <netinet6/in6_var.h> 114 #include <netinet/ip_ecn.h> 115 116 #include <netinet/ip_encap.h> 117 118 #include <machine/stdarg.h> 119 120 #include <net/net_osdep.h> 121 122 #include "bpfilter.h" 123 #include "stf.h" 124 #include "gif.h" /*XXX*/ 125 126 #if NBPFILTER > 0 127 #include <net/bpf.h> 128 #endif 129 130 #if NGIF > 0 131 #include <net/if_gif.h> 132 #endif 133 134 #if NSTF > 0 135 #if NSTF != 1 136 # error only single stf interface allowed 137 #endif 138 139 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 140 #define GET_V4(x) ((struct in_addr *)(&(x)->s6_addr16[1])) 141 142 struct stf_softc { 143 struct ifnet sc_if; /* common area */ 144 union { 145 struct route __sc_ro4; 146 struct route_in6 __sc_ro6; /* just for safety */ 147 } __sc_ro46; 148 #define sc_ro __sc_ro46.__sc_ro4 149 const struct encaptab *encap_cookie; 150 }; 151 152 static struct stf_softc *stf; 153 static int nstf; 154 155 #if NGIF > 0 156 extern int ip_gif_ttl; /*XXX*/ 157 #else 158 static int ip_gif_ttl = 40; /*XXX*/ 159 #endif 160 161 extern struct protosw in_stf_protosw; 162 163 #ifdef __FreeBSD__ 164 void stfattach __P((void *)); 165 #else 166 void stfattach __P((int)); 167 #endif 168 static int stf_encapcheck __P((const struct mbuf *, int, int, void *)); 169 static struct in6_ifaddr *stf_getsrcifa6 __P((struct ifnet *)); 170 static int stf_output __P((struct ifnet *, struct mbuf *, struct sockaddr *, 171 struct rtentry *)); 172 static int stf_checkaddr4 __P((struct in_addr *, struct ifnet *)); 173 static int stf_checkaddr6 __P((struct in6_addr *, struct ifnet *)); 174 #if defined(__bsdi__) && _BSDI_VERSION >= 199802 175 static void stf_rtrequest __P((int, struct rtentry *, struct rt_addrinfo *)); 176 #else 177 static void stf_rtrequest __P((int, struct rtentry *, struct sockaddr *)); 178 #endif 179 #if defined(__FreeBSD__) && __FreeBSD__ < 3 180 static int stf_ioctl __P((struct ifnet *, int, caddr_t)); 181 #else 182 static int stf_ioctl __P((struct ifnet *, u_long, caddr_t)); 183 #endif 184 185 void 186 stfattach(dummy) 187 #ifdef __FreeBSD__ 188 void *dummy; 189 #else 190 int dummy; 191 #endif 192 { 193 struct stf_softc *sc; 194 int i; 195 const struct encaptab *p; 196 197 #ifdef __NetBSD__ 198 nstf = dummy; 199 #else 200 nstf = NSTF; 201 #endif 202 stf = malloc(nstf * sizeof(struct stf_softc), M_DEVBUF, M_WAIT); 203 bzero(stf, nstf * sizeof(struct stf_softc)); 204 sc = stf; 205 206 /* XXX just in case... */ 207 for (i = 0; i < nstf; i++) { 208 sc = &stf[i]; 209 bzero(sc, sizeof(*sc)); 210 #if defined(__NetBSD__) || defined(__OpenBSD__) 211 sprintf(sc->sc_if.if_xname, "stf%d", i); 212 #else 213 sc->sc_if.if_name = "stf"; 214 sc->sc_if.if_unit = i; 215 #endif 216 217 p = encap_attach_func(AF_INET, IPPROTO_IPV6, stf_encapcheck, 218 &in_stf_protosw, sc); 219 if (p == NULL) { 220 printf("%s: attach failed\n", if_name(&sc->sc_if)); 221 continue; 222 } 223 sc->encap_cookie = p; 224 225 sc->sc_if.if_mtu = IPV6_MMTU; 226 sc->sc_if.if_flags = 0; 227 sc->sc_if.if_ioctl = stf_ioctl; 228 sc->sc_if.if_output = stf_output; 229 sc->sc_if.if_type = IFT_STF; 230 if_attach(&sc->sc_if); 231 #if NBPFILTER > 0 232 #ifdef HAVE_OLD_BPF 233 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 234 #else 235 bpfattach(&sc->sc_if.if_bpf, &sc->sc_if, DLT_NULL, sizeof(u_int)); 236 #endif 237 #endif 238 } 239 } 240 241 #ifdef __FreeBSD__ 242 PSEUDO_SET(stfattach, if_stf); 243 #endif 244 245 static int 246 stf_encapcheck(m, off, proto, arg) 247 const struct mbuf *m; 248 int off; 249 int proto; 250 void *arg; 251 { 252 struct ip ip; 253 struct in6_ifaddr *ia6; 254 struct stf_softc *sc; 255 struct in_addr a, b; 256 257 sc = (struct stf_softc *)arg; 258 if (sc == NULL) 259 return 0; 260 261 if ((sc->sc_if.if_flags & IFF_UP) == 0) 262 return 0; 263 264 if (proto != IPPROTO_IPV6) 265 return 0; 266 267 /* LINTED const cast */ 268 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); 269 270 if (ip.ip_v != 4) 271 return 0; 272 273 ia6 = stf_getsrcifa6(&sc->sc_if); 274 if (ia6 == NULL) 275 return 0; 276 277 /* 278 * check if IPv4 dst matches the IPv4 address derived from the 279 * local 6to4 address. 280 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 281 */ 282 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 283 sizeof(ip.ip_dst)) != 0) 284 return 0; 285 286 /* 287 * check if IPv4 src matches the IPv4 address derived from the 288 * local 6to4 address masked by prefixmask. 289 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 290 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 291 */ 292 bzero(&a, sizeof(a)); 293 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 294 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 295 b = ip.ip_src; 296 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 297 if (a.s_addr != b.s_addr) 298 return 0; 299 300 /* stf interface makes single side match only */ 301 return 32; 302 } 303 304 static struct in6_ifaddr * 305 stf_getsrcifa6(ifp) 306 struct ifnet *ifp; 307 { 308 struct ifaddr *ia; 309 struct in_ifaddr *ia4; 310 struct sockaddr_in6 *sin6; 311 struct in_addr in; 312 313 #if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3) 314 for (ia = ifp->if_addrlist; ia; ia = ia->ifa_next) 315 #else 316 for (ia = ifp->if_addrlist.tqh_first; 317 ia; 318 ia = ia->ifa_list.tqe_next) 319 #endif 320 { 321 if (ia->ifa_addr == NULL) 322 continue; 323 if (ia->ifa_addr->sa_family != AF_INET6) 324 continue; 325 sin6 = (struct sockaddr_in6 *)ia->ifa_addr; 326 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 327 continue; 328 329 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 330 #ifdef __NetBSD__ 331 INADDR_TO_IA(in, ia4); 332 #else 333 #ifdef __OpenBSD__ 334 for (ia4 = in_ifaddr.tqh_first; 335 ia4; 336 ia4 = ia4->ia_list.tqe_next) 337 #else 338 for (ia4 = in_ifaddr; ia4 != NULL; ia4 = ia4->ia_next) 339 #endif 340 { 341 if (ia4->ia_addr.sin_addr.s_addr == in.s_addr) 342 break; 343 } 344 #endif 345 if (ia4 == NULL) 346 continue; 347 348 return (struct in6_ifaddr *)ia; 349 } 350 351 return NULL; 352 } 353 354 static int 355 stf_output(ifp, m, dst, rt) 356 struct ifnet *ifp; 357 struct mbuf *m; 358 struct sockaddr *dst; 359 struct rtentry *rt; 360 { 361 struct stf_softc *sc; 362 struct sockaddr_in6 *dst6; 363 struct sockaddr_in *dst4; 364 u_int8_t tos; 365 struct ip *ip; 366 struct ip6_hdr *ip6; 367 struct in6_ifaddr *ia6; 368 369 sc = (struct stf_softc*)ifp; 370 dst6 = (struct sockaddr_in6 *)dst; 371 372 /* just in case */ 373 if ((ifp->if_flags & IFF_UP) == 0) { 374 m_freem(m); 375 return ENETDOWN; 376 } 377 378 /* 379 * If we don't have an ip4 address that match my inner ip6 address, 380 * we shouldn't generate output. Without this check, we'll end up 381 * using wrong IPv4 source. 382 */ 383 ia6 = stf_getsrcifa6(ifp); 384 if (ia6 == NULL) { 385 m_freem(m); 386 return ENETDOWN; 387 } 388 389 if (m->m_len < sizeof(*ip6)) { 390 m = m_pullup(m, sizeof(*ip6)); 391 if (!m) 392 return ENOBUFS; 393 } 394 ip6 = mtod(m, struct ip6_hdr *); 395 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 396 397 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 398 if (m && m->m_len < sizeof(struct ip)) 399 m = m_pullup(m, sizeof(struct ip)); 400 if (m == NULL) 401 return ENOBUFS; 402 ip = mtod(m, struct ip *); 403 404 bzero(ip, sizeof(*ip)); 405 406 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 407 &ip->ip_src, sizeof(ip->ip_src)); 408 bcopy(GET_V4(&dst6->sin6_addr), &ip->ip_dst, sizeof(ip->ip_dst)); 409 ip->ip_p = IPPROTO_IPV6; 410 ip->ip_ttl = ip_gif_ttl; /*XXX*/ 411 ip->ip_len = m->m_pkthdr.len; /*host order*/ 412 if (ifp->if_flags & IFF_LINK1) 413 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 414 415 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst; 416 if (dst4->sin_family != AF_INET || 417 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) { 418 /* cache route doesn't match */ 419 dst4->sin_family = AF_INET; 420 dst4->sin_len = sizeof(struct sockaddr_in); 421 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr)); 422 if (sc->sc_ro.ro_rt) { 423 RTFREE(sc->sc_ro.ro_rt); 424 sc->sc_ro.ro_rt = NULL; 425 } 426 } 427 428 if (sc->sc_ro.ro_rt == NULL) { 429 rtalloc(&sc->sc_ro); 430 if (sc->sc_ro.ro_rt == NULL) { 431 m_freem(m); 432 return ENETUNREACH; 433 } 434 } 435 436 #ifndef __OpenBSD__ 437 return ip_output(m, NULL, &sc->sc_ro, 0, NULL); 438 #else 439 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 440 #endif 441 } 442 443 static int 444 stf_checkaddr4(in, ifp) 445 struct in_addr *in; 446 struct ifnet *ifp; /* incoming interface */ 447 { 448 struct in_ifaddr *ia4; 449 450 /* 451 * reject packets with the following address: 452 * 224.0.0.0/4 0.0.0.0/32 255.255.255.255/32 453 */ 454 if (IN_MULTICAST(in->s_addr) || in->s_addr == INADDR_ANY || 455 in->s_addr == INADDR_BROADCAST) { 456 return -1; 457 } 458 459 /* 460 * reject packets with broadcast 461 */ 462 #if defined(__OpenBSD__) || defined(__NetBSD__) 463 for (ia4 = in_ifaddr.tqh_first; ia4; ia4 = ia4->ia_list.tqe_next) 464 #else 465 for (ia4 = in_ifaddr; ia4 != NULL; ia4 = ia4->ia_next) 466 #endif 467 { 468 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 469 continue; 470 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 471 return -1; 472 } 473 474 /* 475 * perform ingress filter 476 */ 477 if (ifp) { 478 struct sockaddr_in sin; 479 struct rtentry *rt; 480 481 bzero(&sin, sizeof(sin)); 482 sin.sin_family = AF_INET; 483 sin.sin_len = sizeof(struct sockaddr_in); 484 sin.sin_addr = *in; 485 #ifdef __FreeBSD__ 486 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 487 #else 488 rt = rtalloc1((struct sockaddr *)&sin, 0); 489 #endif 490 if (!rt) 491 return -1; 492 if (rt->rt_ifp != ifp) { 493 rtfree(rt); 494 return -1; 495 } 496 rtfree(rt); 497 } 498 499 return 0; 500 } 501 502 static int 503 stf_checkaddr6(in6, ifp) 504 struct in6_addr *in6; 505 struct ifnet *ifp; /* incoming interface */ 506 { 507 /* 508 * check 6to4 addresses 509 */ 510 if (IN6_IS_ADDR_6TO4(in6)) 511 return stf_checkaddr4(GET_V4(in6), ifp); 512 513 /* 514 * reject anything that look suspicious. the test is implemented 515 * in ip6_input too, but we check here as well to 516 * (1) reject bad packets earlier, and 517 * (2) to be safe against future ip6_input change. 518 */ 519 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 520 return -1; 521 522 return 0; 523 } 524 525 void 526 #if __STDC__ 527 in_stf_input(struct mbuf *m, ...) 528 #else 529 in_stf_input(m, va_alist) 530 register struct mbuf *m; 531 #endif 532 { 533 int off, proto; 534 struct stf_softc *sc; 535 struct ip *ip; 536 struct ip6_hdr *ip6; 537 u_int8_t otos, itos; 538 int s, isr; 539 struct ifqueue *ifq = NULL; 540 struct ifnet *ifp; 541 va_list ap; 542 543 va_start(ap, m); 544 off = va_arg(ap, int); 545 proto = va_arg(ap, int); 546 va_end(ap); 547 548 if (proto != IPPROTO_IPV6) { 549 m_freem(m); 550 return; 551 } 552 553 ip = mtod(m, struct ip *); 554 555 sc = (struct stf_softc *)encap_getarg(m); 556 557 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 558 m_freem(m); 559 return; 560 } 561 562 ifp = &sc->sc_if; 563 564 /* 565 * perform sanity check against outer src/dst. 566 * for source, perform ingress filter as well. 567 */ 568 if (stf_checkaddr4(&ip->ip_dst, NULL) < 0 || 569 stf_checkaddr4(&ip->ip_src, m->m_pkthdr.rcvif) < 0) { 570 m_freem(m); 571 return; 572 } 573 574 otos = ip->ip_tos; 575 m_adj(m, off); 576 577 if (m->m_len < sizeof(*ip6)) { 578 m = m_pullup(m, sizeof(*ip6)); 579 if (!m) 580 return; 581 } 582 ip6 = mtod(m, struct ip6_hdr *); 583 584 /* 585 * perform sanity check against inner src/dst. 586 * for source, perform ingress filter as well. 587 */ 588 if (stf_checkaddr6(&ip6->ip6_dst, NULL) < 0 || 589 stf_checkaddr6(&ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 590 m_freem(m); 591 return; 592 } 593 594 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 595 if ((ifp->if_flags & IFF_LINK1) != 0) 596 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 597 ip6->ip6_flow &= ~htonl(0xff << 20); 598 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 599 600 m->m_pkthdr.rcvif = ifp; 601 602 #if NBPFILTER > 0 603 if (ifp->if_bpf) { 604 /* 605 * We need to prepend the address family as 606 * a four byte field. Cons up a dummy header 607 * to pacify bpf. This is safe because bpf 608 * will only read from the mbuf (i.e., it won't 609 * try to free it or keep a pointer a to it). 610 */ 611 struct mbuf m0; 612 u_int af = AF_INET6; 613 614 m0.m_next = m; 615 m0.m_len = 4; 616 m0.m_data = (char *)⁡ 617 618 #ifdef HAVE_OLD_BPF 619 bpf_mtap(ifp, &m0); 620 #else 621 bpf_mtap(ifp->if_bpf, &m0); 622 #endif 623 } 624 #endif /*NBPFILTER > 0*/ 625 626 /* 627 * Put the packet to the network layer input queue according to the 628 * specified address family. 629 * See net/if_gif.c for possible issues with packet processing 630 * reorder due to extra queueing. 631 */ 632 ifq = &ip6intrq; 633 isr = NETISR_IPV6; 634 635 s = splimp(); 636 if (IF_QFULL(ifq)) { 637 IF_DROP(ifq); /* update statistics */ 638 m_freem(m); 639 splx(s); 640 return; 641 } 642 IF_ENQUEUE(ifq, m); 643 schednetisr(isr); 644 ifp->if_ipackets++; 645 ifp->if_ibytes += m->m_pkthdr.len; 646 splx(s); 647 } 648 649 /* ARGSUSED */ 650 static void 651 stf_rtrequest(cmd, rt, sa) 652 int cmd; 653 struct rtentry *rt; 654 #if defined(__bsdi__) && _BSDI_VERSION >= 199802 655 struct rt_addrinfo *sa; 656 #else 657 struct sockaddr *sa; 658 #endif 659 { 660 661 if (rt) 662 rt->rt_rmx.rmx_mtu = IPV6_MMTU; 663 } 664 665 static int 666 stf_ioctl(ifp, cmd, data) 667 struct ifnet *ifp; 668 #if defined(__FreeBSD__) && __FreeBSD__ < 3 669 int cmd; 670 #else 671 u_long cmd; 672 #endif 673 caddr_t data; 674 { 675 struct ifaddr *ifa; 676 struct ifreq *ifr; 677 struct sockaddr_in6 *sin6; 678 int error; 679 680 error = 0; 681 switch (cmd) { 682 case SIOCSIFADDR: 683 ifa = (struct ifaddr *)data; 684 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 685 error = EAFNOSUPPORT; 686 break; 687 } 688 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 689 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) { 690 ifa->ifa_rtrequest = stf_rtrequest; 691 ifp->if_flags |= IFF_UP; 692 } else 693 error = EINVAL; 694 break; 695 696 case SIOCADDMULTI: 697 case SIOCDELMULTI: 698 ifr = (struct ifreq *)data; 699 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 700 ; 701 else 702 error = EAFNOSUPPORT; 703 break; 704 705 default: 706 error = EINVAL; 707 break; 708 } 709 710 return error; 711 } 712 713 #endif /* NSTF > 0 */ 714
Indexes created Mon Sep 29 21:09:56 GMT 2025