1 /* $NetBSD: if_stf.c,v 1.76 2011/07/17 20:54:52 joerg 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 1.76 2011/07/17 20:54:52 joerg 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/proc.h> 90 #include <sys/protosw.h> 91 #include <sys/queue.h> 92 #include <sys/syslog.h> 93 #include <sys/kauth.h> 94 95 #include <sys/cpu.h> 96 97 #include <net/if.h> 98 #include <net/route.h> 99 #include <net/netisr.h> 100 #include <net/if_types.h> 101 #include <net/if_stf.h> 102 103 #include <netinet/in.h> 104 #include <netinet/in_systm.h> 105 #include <netinet/ip.h> 106 #include <netinet/ip_var.h> 107 #include <netinet/in_var.h> 108 109 #include <netinet/ip6.h> 110 #include <netinet6/ip6_var.h> 111 #include <netinet6/in6_gif.h> 112 #include <netinet6/in6_var.h> 113 #include <netinet/ip_ecn.h> 114 115 #include <netinet/ip_encap.h> 116 117 #include <net/net_osdep.h> 118 119 #include "stf.h" 120 #include "gif.h" /*XXX*/ 121 122 #include <net/bpf.h> 123 124 #if NGIF > 0 125 #include <net/if_gif.h> 126 #endif 127 128 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 129 #define GET_V4(x) ((const struct in_addr *)(&(x)->s6_addr16[1])) 130 131 struct stf_softc { 132 struct ifnet sc_if; /* common area */ 133 struct route sc_ro; 134 const struct encaptab *encap_cookie; 135 LIST_ENTRY(stf_softc) sc_list; 136 }; 137 138 static LIST_HEAD(, stf_softc) stf_softc_list; 139 140 static int stf_clone_create(struct if_clone *, int); 141 static int stf_clone_destroy(struct ifnet *); 142 143 struct if_clone stf_cloner = 144 IF_CLONE_INITIALIZER("stf", stf_clone_create, stf_clone_destroy); 145 146 #if NGIF > 0 147 extern int ip_gif_ttl; /*XXX*/ 148 #else 149 static int ip_gif_ttl = 40; /*XXX*/ 150 #endif 151 152 extern struct domain inetdomain; 153 static const struct protosw in_stf_protosw = 154 { SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR, 155 in_stf_input, rip_output, 0, rip_ctloutput, 156 rip_usrreq, 157 0, 0, 0, 0 158 }; 159 160 void stfattach(int); 161 162 static int stf_encapcheck(struct mbuf *, int, int, void *); 163 static struct in6_ifaddr *stf_getsrcifa6(struct ifnet *); 164 static int stf_output(struct ifnet *, struct mbuf *, const struct sockaddr *, 165 struct rtentry *); 166 static int isrfc1918addr(const struct in_addr *); 167 static int stf_checkaddr4(struct stf_softc *, const struct in_addr *, 168 struct ifnet *); 169 static int stf_checkaddr6(struct stf_softc *, const struct in6_addr *, 170 struct ifnet *); 171 static void stf_rtrequest(int, struct rtentry *, const struct rt_addrinfo *); 172 static int stf_ioctl(struct ifnet *, u_long, void *); 173 174 /* ARGSUSED */ 175 void 176 stfattach(int count) 177 { 178 179 LIST_INIT(&stf_softc_list); 180 if_clone_attach(&stf_cloner); 181 } 182 183 static int 184 stf_clone_create(struct if_clone *ifc, int unit) 185 { 186 struct stf_softc *sc; 187 188 if (LIST_FIRST(&stf_softc_list) != NULL) { 189 /* Only one stf interface is allowed. */ 190 return (EEXIST); 191 } 192 193 sc = malloc(sizeof(struct stf_softc), M_DEVBUF, M_WAIT|M_ZERO); 194 195 if_initname(&sc->sc_if, ifc->ifc_name, unit); 196 197 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 198 stf_encapcheck, &in_stf_protosw, sc); 199 if (sc->encap_cookie == NULL) { 200 printf("%s: unable to attach encap\n", if_name(&sc->sc_if)); 201 free(sc, M_DEVBUF); 202 return (EIO); /* XXX */ 203 } 204 205 sc->sc_if.if_mtu = STF_MTU; 206 sc->sc_if.if_flags = 0; 207 sc->sc_if.if_ioctl = stf_ioctl; 208 sc->sc_if.if_output = stf_output; 209 sc->sc_if.if_type = IFT_STF; 210 sc->sc_if.if_dlt = DLT_NULL; 211 if_attach(&sc->sc_if); 212 if_alloc_sadl(&sc->sc_if); 213 bpf_attach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 214 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 215 return (0); 216 } 217 218 static int 219 stf_clone_destroy(struct ifnet *ifp) 220 { 221 struct stf_softc *sc = (void *) ifp; 222 223 LIST_REMOVE(sc, sc_list); 224 encap_detach(sc->encap_cookie); 225 bpf_detach(ifp); 226 if_detach(ifp); 227 rtcache_free(&sc->sc_ro); 228 free(sc, M_DEVBUF); 229 230 return (0); 231 } 232 233 static int 234 stf_encapcheck(struct mbuf *m, int off, int proto, void *arg) 235 { 236 struct ip ip; 237 struct in6_ifaddr *ia6; 238 struct stf_softc *sc; 239 struct in_addr a, b; 240 241 sc = (struct stf_softc *)arg; 242 if (sc == NULL) 243 return 0; 244 245 if ((sc->sc_if.if_flags & IFF_UP) == 0) 246 return 0; 247 248 /* IFF_LINK0 means "no decapsulation" */ 249 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 250 return 0; 251 252 if (proto != IPPROTO_IPV6) 253 return 0; 254 255 m_copydata(m, 0, sizeof(ip), (void *)&ip); 256 257 if (ip.ip_v != 4) 258 return 0; 259 260 ia6 = stf_getsrcifa6(&sc->sc_if); 261 if (ia6 == NULL) 262 return 0; 263 264 /* 265 * check if IPv4 dst matches the IPv4 address derived from the 266 * local 6to4 address. 267 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 268 */ 269 if (memcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 270 sizeof(ip.ip_dst)) != 0) 271 return 0; 272 273 /* 274 * check if IPv4 src matches the IPv4 address derived from the 275 * local 6to4 address masked by prefixmask. 276 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 277 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 278 */ 279 memset(&a, 0, sizeof(a)); 280 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 281 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 282 b = ip.ip_src; 283 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 284 if (a.s_addr != b.s_addr) 285 return 0; 286 287 /* stf interface makes single side match only */ 288 return 32; 289 } 290 291 static struct in6_ifaddr * 292 stf_getsrcifa6(struct ifnet *ifp) 293 { 294 struct ifaddr *ifa; 295 struct in_ifaddr *ia4; 296 struct sockaddr_in6 *sin6; 297 struct in_addr in; 298 299 IFADDR_FOREACH(ifa, ifp) 300 { 301 if (ifa->ifa_addr == NULL) 302 continue; 303 if (ifa->ifa_addr->sa_family != AF_INET6) 304 continue; 305 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 306 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 307 continue; 308 309 memcpy(&in, GET_V4(&sin6->sin6_addr), sizeof(in)); 310 INADDR_TO_IA(in, ia4); 311 if (ia4 == NULL) 312 continue; 313 314 return (struct in6_ifaddr *)ifa; 315 } 316 317 return NULL; 318 } 319 320 static int 321 stf_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 322 struct rtentry *rt0) 323 { 324 struct rtentry *rt; 325 struct stf_softc *sc; 326 const struct sockaddr_in6 *dst6; 327 const struct in_addr *in4; 328 uint8_t tos; 329 struct ip *ip; 330 struct ip6_hdr *ip6; 331 struct in6_ifaddr *ia6; 332 union { 333 struct sockaddr dst; 334 struct sockaddr_in dst4; 335 } u; 336 337 sc = (struct stf_softc*)ifp; 338 dst6 = (const struct sockaddr_in6 *)dst; 339 340 /* just in case */ 341 if ((ifp->if_flags & IFF_UP) == 0) { 342 m_freem(m); 343 return ENETDOWN; 344 } 345 346 /* 347 * If we don't have an ip4 address that match my inner ip6 address, 348 * we shouldn't generate output. Without this check, we'll end up 349 * using wrong IPv4 source. 350 */ 351 ia6 = stf_getsrcifa6(ifp); 352 if (ia6 == NULL) { 353 m_freem(m); 354 ifp->if_oerrors++; 355 return ENETDOWN; 356 } 357 358 if (m->m_len < sizeof(*ip6)) { 359 m = m_pullup(m, sizeof(*ip6)); 360 if (m == NULL) { 361 ifp->if_oerrors++; 362 return ENOBUFS; 363 } 364 } 365 ip6 = mtod(m, struct ip6_hdr *); 366 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 367 368 /* 369 * Pickup the right outer dst addr from the list of candidates. 370 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 371 */ 372 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 373 in4 = GET_V4(&ip6->ip6_dst); 374 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 375 in4 = GET_V4(&dst6->sin6_addr); 376 else { 377 m_freem(m); 378 ifp->if_oerrors++; 379 return ENETUNREACH; 380 } 381 382 bpf_mtap_af(ifp, AF_INET6, m); 383 384 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 385 if (m && m->m_len < sizeof(struct ip)) 386 m = m_pullup(m, sizeof(struct ip)); 387 if (m == NULL) { 388 ifp->if_oerrors++; 389 return ENOBUFS; 390 } 391 ip = mtod(m, struct ip *); 392 393 memset(ip, 0, sizeof(*ip)); 394 395 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 396 &ip->ip_src, sizeof(ip->ip_src)); 397 memcpy(&ip->ip_dst, in4, sizeof(ip->ip_dst)); 398 ip->ip_p = IPPROTO_IPV6; 399 ip->ip_ttl = ip_gif_ttl; /*XXX*/ 400 ip->ip_len = htons(m->m_pkthdr.len); 401 if (ifp->if_flags & IFF_LINK1) 402 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 403 else 404 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 405 406 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 407 if ((rt = rtcache_lookup(&sc->sc_ro, &u.dst)) == NULL) { 408 m_freem(m); 409 ifp->if_oerrors++; 410 return ENETUNREACH; 411 } 412 413 /* If the route constitutes infinite encapsulation, punt. */ 414 if (rt->rt_ifp == ifp) { 415 rtcache_free(&sc->sc_ro); 416 m_freem(m); 417 ifp->if_oerrors++; 418 return ENETUNREACH; 419 } 420 421 ifp->if_opackets++; 422 ifp->if_obytes += m->m_pkthdr.len - sizeof(struct ip); 423 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 424 } 425 426 static int 427 isrfc1918addr(const struct in_addr *in) 428 { 429 /* 430 * returns 1 if private address range: 431 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 432 */ 433 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 || 434 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 || 435 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168) 436 return 1; 437 438 return 0; 439 } 440 441 static int 442 stf_checkaddr4(struct stf_softc *sc, const struct in_addr *in, 443 struct ifnet *inifp /*incoming interface*/) 444 { 445 struct in_ifaddr *ia4; 446 447 /* 448 * reject packets with the following address: 449 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 450 */ 451 if (IN_MULTICAST(in->s_addr)) 452 return -1; 453 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 454 case 0: case 127: case 255: 455 return -1; 456 } 457 458 /* 459 * reject packets with private address range. 460 * (requirement from RFC3056 section 2 1st paragraph) 461 */ 462 if (isrfc1918addr(in)) 463 return -1; 464 465 /* 466 * reject packet with IPv4 link-local (169.254.0.0/16), 467 * as suggested in draft-savola-v6ops-6to4-security-00.txt 468 */ 469 if (((ntohl(in->s_addr) & 0xff000000) >> 24) == 169 && 470 ((ntohl(in->s_addr) & 0x00ff0000) >> 16) == 254) 471 return -1; 472 473 /* 474 * reject packets with broadcast 475 */ 476 TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_list) 477 { 478 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 479 continue; 480 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 481 return -1; 482 } 483 484 /* 485 * perform ingress filter 486 */ 487 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 488 struct sockaddr_in sin; 489 struct rtentry *rt; 490 491 memset(&sin, 0, sizeof(sin)); 492 sin.sin_family = AF_INET; 493 sin.sin_len = sizeof(struct sockaddr_in); 494 sin.sin_addr = *in; 495 rt = rtalloc1((struct sockaddr *)&sin, 0); 496 if (!rt || rt->rt_ifp != inifp) { 497 #if 0 498 log(LOG_WARNING, "%s: packet from 0x%x dropped " 499 "due to ingress filter\n", if_name(&sc->sc_if), 500 (uint32_t)ntohl(sin.sin_addr.s_addr)); 501 #endif 502 if (rt) 503 rtfree(rt); 504 return -1; 505 } 506 rtfree(rt); 507 } 508 509 return 0; 510 } 511 512 static int 513 stf_checkaddr6(struct stf_softc *sc, const struct in6_addr *in6, 514 struct ifnet *inifp /*incoming interface*/) 515 { 516 517 /* 518 * check 6to4 addresses 519 */ 520 if (IN6_IS_ADDR_6TO4(in6)) 521 return stf_checkaddr4(sc, GET_V4(in6), inifp); 522 523 /* 524 * reject anything that look suspicious. the test is implemented 525 * in ip6_input too, but we check here as well to 526 * (1) reject bad packets earlier, and 527 * (2) to be safe against future ip6_input change. 528 */ 529 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 530 return -1; 531 532 /* 533 * reject link-local and site-local unicast 534 * as suggested in draft-savola-v6ops-6to4-security-00.txt 535 */ 536 if (IN6_IS_ADDR_LINKLOCAL(in6) || IN6_IS_ADDR_SITELOCAL(in6)) 537 return -1; 538 539 /* 540 * reject node-local and link-local multicast 541 * as suggested in draft-savola-v6ops-6to4-security-00.txt 542 */ 543 if (IN6_IS_ADDR_MC_NODELOCAL(in6) || IN6_IS_ADDR_MC_LINKLOCAL(in6)) 544 return -1; 545 546 return 0; 547 } 548 549 void 550 in_stf_input(struct mbuf *m, ...) 551 { 552 int off, proto; 553 struct stf_softc *sc; 554 struct ip *ip; 555 struct ip6_hdr *ip6; 556 uint8_t otos, itos; 557 int s, isr; 558 struct ifqueue *ifq = NULL; 559 struct ifnet *ifp; 560 va_list ap; 561 562 va_start(ap, m); 563 off = va_arg(ap, int); 564 proto = va_arg(ap, int); 565 va_end(ap); 566 567 if (proto != IPPROTO_IPV6) { 568 m_freem(m); 569 return; 570 } 571 572 ip = mtod(m, struct ip *); 573 574 sc = (struct stf_softc *)encap_getarg(m); 575 576 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 577 m_freem(m); 578 return; 579 } 580 581 ifp = &sc->sc_if; 582 583 /* 584 * perform sanity check against outer src/dst. 585 * for source, perform ingress filter as well. 586 */ 587 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 588 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 589 m_freem(m); 590 return; 591 } 592 593 otos = ip->ip_tos; 594 m_adj(m, off); 595 596 if (m->m_len < sizeof(*ip6)) { 597 m = m_pullup(m, sizeof(*ip6)); 598 if (!m) 599 return; 600 } 601 ip6 = mtod(m, struct ip6_hdr *); 602 603 /* 604 * perform sanity check against inner src/dst. 605 * for source, perform ingress filter as well. 606 */ 607 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 608 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 609 m_freem(m); 610 return; 611 } 612 613 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 614 if ((ifp->if_flags & IFF_LINK1) != 0) 615 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 616 else 617 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 618 ip6->ip6_flow &= ~htonl(0xff << 20); 619 ip6->ip6_flow |= htonl((uint32_t)itos << 20); 620 621 m->m_pkthdr.rcvif = ifp; 622 623 bpf_mtap_af(ifp, AF_INET6, m); 624 625 /* 626 * Put the packet to the network layer input queue according to the 627 * specified address family. 628 * See net/if_gif.c for possible issues with packet processing 629 * reorder due to extra queueing. 630 */ 631 ifq = &ip6intrq; 632 isr = NETISR_IPV6; 633 634 s = splnet(); 635 if (IF_QFULL(ifq)) { 636 IF_DROP(ifq); /* update statistics */ 637 m_freem(m); 638 splx(s); 639 return; 640 } 641 IF_ENQUEUE(ifq, m); 642 schednetisr(isr); 643 ifp->if_ipackets++; 644 ifp->if_ibytes += m->m_pkthdr.len; 645 splx(s); 646 } 647 648 /* ARGSUSED */ 649 static void 650 stf_rtrequest(int cmd, struct rtentry *rt, 651 const struct rt_addrinfo *info) 652 { 653 if (rt != NULL) { 654 struct stf_softc *sc; 655 656 sc = LIST_FIRST(&stf_softc_list); 657 rt->rt_rmx.rmx_mtu = (sc != NULL) ? sc->sc_if.if_mtu : STF_MTU; 658 } 659 } 660 661 static int 662 stf_ioctl(struct ifnet *ifp, u_long cmd, void *data) 663 { 664 struct lwp *l = curlwp; /* XXX */ 665 struct ifaddr *ifa; 666 struct ifreq *ifr = data; 667 struct sockaddr_in6 *sin6; 668 int error; 669 670 error = 0; 671 switch (cmd) { 672 case SIOCINITIFADDR: 673 ifa = (struct ifaddr *)data; 674 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 675 error = EAFNOSUPPORT; 676 break; 677 } 678 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 679 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr) && 680 !isrfc1918addr(GET_V4(&sin6->sin6_addr))) { 681 ifa->ifa_rtrequest = stf_rtrequest; 682 ifp->if_flags |= IFF_UP; 683 } else 684 error = EINVAL; 685 break; 686 687 case SIOCADDMULTI: 688 case SIOCDELMULTI: 689 if (ifr != NULL && 690 ifreq_getaddr(cmd, ifr)->sa_family == AF_INET6) 691 ; 692 else 693 error = EAFNOSUPPORT; 694 break; 695 696 case SIOCSIFMTU: 697 error = kauth_authorize_network(l->l_cred, 698 KAUTH_NETWORK_INTERFACE, 699 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, KAUTH_ARG(cmd), 700 NULL); 701 if (error) 702 break; 703 if (ifr->ifr_mtu < STF_MTU_MIN || ifr->ifr_mtu > STF_MTU_MAX) 704 return EINVAL; 705 else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 706 error = 0; 707 break; 708 709 default: 710 error = ifioctl_common(ifp, cmd, data); 711 break; 712 } 713 714 return error; 715 } 716