1 /* $NetBSD: if_stf.c,v 1.75 2010/04/05 07:22:24 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 1.75 2010/04/05 07:22:24 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 <machine/stdarg.h> 118 119 #include <net/net_osdep.h> 120 121 #include "stf.h" 122 #include "gif.h" /*XXX*/ 123 124 #include <net/bpf.h> 125 126 #if NGIF > 0 127 #include <net/if_gif.h> 128 #endif 129 130 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 131 #define GET_V4(x) ((const struct in_addr *)(&(x)->s6_addr16[1])) 132 133 struct stf_softc { 134 struct ifnet sc_if; /* common area */ 135 struct route sc_ro; 136 const struct encaptab *encap_cookie; 137 LIST_ENTRY(stf_softc) sc_list; 138 }; 139 140 static LIST_HEAD(, stf_softc) stf_softc_list; 141 142 static int stf_clone_create(struct if_clone *, int); 143 static int stf_clone_destroy(struct ifnet *); 144 145 struct if_clone stf_cloner = 146 IF_CLONE_INITIALIZER("stf", stf_clone_create, stf_clone_destroy); 147 148 #if NGIF > 0 149 extern int ip_gif_ttl; /*XXX*/ 150 #else 151 static int ip_gif_ttl = 40; /*XXX*/ 152 #endif 153 154 extern struct domain inetdomain; 155 static const struct protosw in_stf_protosw = 156 { SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR, 157 in_stf_input, rip_output, 0, rip_ctloutput, 158 rip_usrreq, 159 0, 0, 0, 0 160 }; 161 162 void stfattach(int); 163 164 static int stf_encapcheck(struct mbuf *, int, int, void *); 165 static struct in6_ifaddr *stf_getsrcifa6(struct ifnet *); 166 static int stf_output(struct ifnet *, struct mbuf *, const struct sockaddr *, 167 struct rtentry *); 168 static int isrfc1918addr(const struct in_addr *); 169 static int stf_checkaddr4(struct stf_softc *, const struct in_addr *, 170 struct ifnet *); 171 static int stf_checkaddr6(struct stf_softc *, const struct in6_addr *, 172 struct ifnet *); 173 static void stf_rtrequest(int, struct rtentry *, const struct rt_addrinfo *); 174 static int stf_ioctl(struct ifnet *, u_long, void *); 175 176 /* ARGSUSED */ 177 void 178 stfattach(int count) 179 { 180 181 LIST_INIT(&stf_softc_list); 182 if_clone_attach(&stf_cloner); 183 } 184 185 static int 186 stf_clone_create(struct if_clone *ifc, int unit) 187 { 188 struct stf_softc *sc; 189 190 if (LIST_FIRST(&stf_softc_list) != NULL) { 191 /* Only one stf interface is allowed. */ 192 return (EEXIST); 193 } 194 195 sc = malloc(sizeof(struct stf_softc), M_DEVBUF, M_WAIT|M_ZERO); 196 197 if_initname(&sc->sc_if, ifc->ifc_name, unit); 198 199 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 200 stf_encapcheck, &in_stf_protosw, sc); 201 if (sc->encap_cookie == NULL) { 202 printf("%s: unable to attach encap\n", if_name(&sc->sc_if)); 203 free(sc, M_DEVBUF); 204 return (EIO); /* XXX */ 205 } 206 207 sc->sc_if.if_mtu = STF_MTU; 208 sc->sc_if.if_flags = 0; 209 sc->sc_if.if_ioctl = stf_ioctl; 210 sc->sc_if.if_output = stf_output; 211 sc->sc_if.if_type = IFT_STF; 212 sc->sc_if.if_dlt = DLT_NULL; 213 if_attach(&sc->sc_if); 214 if_alloc_sadl(&sc->sc_if); 215 bpf_attach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 216 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 217 return (0); 218 } 219 220 static int 221 stf_clone_destroy(struct ifnet *ifp) 222 { 223 struct stf_softc *sc = (void *) ifp; 224 225 LIST_REMOVE(sc, sc_list); 226 encap_detach(sc->encap_cookie); 227 bpf_detach(ifp); 228 if_detach(ifp); 229 rtcache_free(&sc->sc_ro); 230 free(sc, M_DEVBUF); 231 232 return (0); 233 } 234 235 static int 236 stf_encapcheck(struct mbuf *m, int off, int proto, void *arg) 237 { 238 struct ip ip; 239 struct in6_ifaddr *ia6; 240 struct stf_softc *sc; 241 struct in_addr a, b; 242 243 sc = (struct stf_softc *)arg; 244 if (sc == NULL) 245 return 0; 246 247 if ((sc->sc_if.if_flags & IFF_UP) == 0) 248 return 0; 249 250 /* IFF_LINK0 means "no decapsulation" */ 251 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 252 return 0; 253 254 if (proto != IPPROTO_IPV6) 255 return 0; 256 257 m_copydata(m, 0, sizeof(ip), (void *)&ip); 258 259 if (ip.ip_v != 4) 260 return 0; 261 262 ia6 = stf_getsrcifa6(&sc->sc_if); 263 if (ia6 == NULL) 264 return 0; 265 266 /* 267 * check if IPv4 dst matches the IPv4 address derived from the 268 * local 6to4 address. 269 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 270 */ 271 if (memcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 272 sizeof(ip.ip_dst)) != 0) 273 return 0; 274 275 /* 276 * check if IPv4 src matches the IPv4 address derived from the 277 * local 6to4 address masked by prefixmask. 278 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 279 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 280 */ 281 memset(&a, 0, sizeof(a)); 282 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 283 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 284 b = ip.ip_src; 285 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 286 if (a.s_addr != b.s_addr) 287 return 0; 288 289 /* stf interface makes single side match only */ 290 return 32; 291 } 292 293 static struct in6_ifaddr * 294 stf_getsrcifa6(struct ifnet *ifp) 295 { 296 struct ifaddr *ifa; 297 struct in_ifaddr *ia4; 298 struct sockaddr_in6 *sin6; 299 struct in_addr in; 300 301 IFADDR_FOREACH(ifa, ifp) 302 { 303 if (ifa->ifa_addr == NULL) 304 continue; 305 if (ifa->ifa_addr->sa_family != AF_INET6) 306 continue; 307 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 308 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 309 continue; 310 311 memcpy(&in, GET_V4(&sin6->sin6_addr), sizeof(in)); 312 INADDR_TO_IA(in, ia4); 313 if (ia4 == NULL) 314 continue; 315 316 return (struct in6_ifaddr *)ifa; 317 } 318 319 return NULL; 320 } 321 322 static int 323 stf_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 324 struct rtentry *rt0) 325 { 326 struct rtentry *rt; 327 struct stf_softc *sc; 328 const struct sockaddr_in6 *dst6; 329 const struct in_addr *in4; 330 uint8_t tos; 331 struct ip *ip; 332 struct ip6_hdr *ip6; 333 struct in6_ifaddr *ia6; 334 union { 335 struct sockaddr dst; 336 struct sockaddr_in dst4; 337 } u; 338 339 sc = (struct stf_softc*)ifp; 340 dst6 = (const struct sockaddr_in6 *)dst; 341 342 /* just in case */ 343 if ((ifp->if_flags & IFF_UP) == 0) { 344 m_freem(m); 345 return ENETDOWN; 346 } 347 348 /* 349 * If we don't have an ip4 address that match my inner ip6 address, 350 * we shouldn't generate output. Without this check, we'll end up 351 * using wrong IPv4 source. 352 */ 353 ia6 = stf_getsrcifa6(ifp); 354 if (ia6 == NULL) { 355 m_freem(m); 356 ifp->if_oerrors++; 357 return ENETDOWN; 358 } 359 360 if (m->m_len < sizeof(*ip6)) { 361 m = m_pullup(m, sizeof(*ip6)); 362 if (m == NULL) { 363 ifp->if_oerrors++; 364 return ENOBUFS; 365 } 366 } 367 ip6 = mtod(m, struct ip6_hdr *); 368 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 369 370 /* 371 * Pickup the right outer dst addr from the list of candidates. 372 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 373 */ 374 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 375 in4 = GET_V4(&ip6->ip6_dst); 376 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 377 in4 = GET_V4(&dst6->sin6_addr); 378 else { 379 m_freem(m); 380 ifp->if_oerrors++; 381 return ENETUNREACH; 382 } 383 384 bpf_mtap_af(ifp, AF_INET6, m); 385 386 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 387 if (m && m->m_len < sizeof(struct ip)) 388 m = m_pullup(m, sizeof(struct ip)); 389 if (m == NULL) { 390 ifp->if_oerrors++; 391 return ENOBUFS; 392 } 393 ip = mtod(m, struct ip *); 394 395 memset(ip, 0, sizeof(*ip)); 396 397 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 398 &ip->ip_src, sizeof(ip->ip_src)); 399 memcpy(&ip->ip_dst, in4, sizeof(ip->ip_dst)); 400 ip->ip_p = IPPROTO_IPV6; 401 ip->ip_ttl = ip_gif_ttl; /*XXX*/ 402 ip->ip_len = htons(m->m_pkthdr.len); 403 if (ifp->if_flags & IFF_LINK1) 404 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 405 else 406 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 407 408 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 409 if ((rt = rtcache_lookup(&sc->sc_ro, &u.dst)) == NULL) { 410 m_freem(m); 411 ifp->if_oerrors++; 412 return ENETUNREACH; 413 } 414 415 /* If the route constitutes infinite encapsulation, punt. */ 416 if (rt->rt_ifp == ifp) { 417 rtcache_free(&sc->sc_ro); 418 m_freem(m); 419 ifp->if_oerrors++; 420 return ENETUNREACH; 421 } 422 423 ifp->if_opackets++; 424 ifp->if_obytes += m->m_pkthdr.len - sizeof(struct ip); 425 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 426 } 427 428 static int 429 isrfc1918addr(const struct in_addr *in) 430 { 431 /* 432 * returns 1 if private address range: 433 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 434 */ 435 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 || 436 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 || 437 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168) 438 return 1; 439 440 return 0; 441 } 442 443 static int 444 stf_checkaddr4(struct stf_softc *sc, const struct in_addr *in, 445 struct ifnet *inifp /*incoming interface*/) 446 { 447 struct in_ifaddr *ia4; 448 449 /* 450 * reject packets with the following address: 451 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 452 */ 453 if (IN_MULTICAST(in->s_addr)) 454 return -1; 455 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 456 case 0: case 127: case 255: 457 return -1; 458 } 459 460 /* 461 * reject packets with private address range. 462 * (requirement from RFC3056 section 2 1st paragraph) 463 */ 464 if (isrfc1918addr(in)) 465 return -1; 466 467 /* 468 * reject packet with IPv4 link-local (169.254.0.0/16), 469 * as suggested in draft-savola-v6ops-6to4-security-00.txt 470 */ 471 if (((ntohl(in->s_addr) & 0xff000000) >> 24) == 169 && 472 ((ntohl(in->s_addr) & 0x00ff0000) >> 16) == 254) 473 return -1; 474 475 /* 476 * reject packets with broadcast 477 */ 478 TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_list) 479 { 480 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 481 continue; 482 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 483 return -1; 484 } 485 486 /* 487 * perform ingress filter 488 */ 489 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 490 struct sockaddr_in sin; 491 struct rtentry *rt; 492 493 memset(&sin, 0, sizeof(sin)); 494 sin.sin_family = AF_INET; 495 sin.sin_len = sizeof(struct sockaddr_in); 496 sin.sin_addr = *in; 497 rt = rtalloc1((struct sockaddr *)&sin, 0); 498 if (!rt || rt->rt_ifp != inifp) { 499 #if 0 500 log(LOG_WARNING, "%s: packet from 0x%x dropped " 501 "due to ingress filter\n", if_name(&sc->sc_if), 502 (uint32_t)ntohl(sin.sin_addr.s_addr)); 503 #endif 504 if (rt) 505 rtfree(rt); 506 return -1; 507 } 508 rtfree(rt); 509 } 510 511 return 0; 512 } 513 514 static int 515 stf_checkaddr6(struct stf_softc *sc, const struct in6_addr *in6, 516 struct ifnet *inifp /*incoming interface*/) 517 { 518 519 /* 520 * check 6to4 addresses 521 */ 522 if (IN6_IS_ADDR_6TO4(in6)) 523 return stf_checkaddr4(sc, GET_V4(in6), inifp); 524 525 /* 526 * reject anything that look suspicious. the test is implemented 527 * in ip6_input too, but we check here as well to 528 * (1) reject bad packets earlier, and 529 * (2) to be safe against future ip6_input change. 530 */ 531 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 532 return -1; 533 534 /* 535 * reject link-local and site-local unicast 536 * as suggested in draft-savola-v6ops-6to4-security-00.txt 537 */ 538 if (IN6_IS_ADDR_LINKLOCAL(in6) || IN6_IS_ADDR_SITELOCAL(in6)) 539 return -1; 540 541 /* 542 * reject node-local and link-local multicast 543 * as suggested in draft-savola-v6ops-6to4-security-00.txt 544 */ 545 if (IN6_IS_ADDR_MC_NODELOCAL(in6) || IN6_IS_ADDR_MC_LINKLOCAL(in6)) 546 return -1; 547 548 return 0; 549 } 550 551 void 552 in_stf_input(struct mbuf *m, ...) 553 { 554 int off, proto; 555 struct stf_softc *sc; 556 struct ip *ip; 557 struct ip6_hdr *ip6; 558 uint8_t otos, itos; 559 int s, isr; 560 struct ifqueue *ifq = NULL; 561 struct ifnet *ifp; 562 va_list ap; 563 564 va_start(ap, m); 565 off = va_arg(ap, int); 566 proto = va_arg(ap, int); 567 va_end(ap); 568 569 if (proto != IPPROTO_IPV6) { 570 m_freem(m); 571 return; 572 } 573 574 ip = mtod(m, struct ip *); 575 576 sc = (struct stf_softc *)encap_getarg(m); 577 578 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 579 m_freem(m); 580 return; 581 } 582 583 ifp = &sc->sc_if; 584 585 /* 586 * perform sanity check against outer src/dst. 587 * for source, perform ingress filter as well. 588 */ 589 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 590 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 591 m_freem(m); 592 return; 593 } 594 595 otos = ip->ip_tos; 596 m_adj(m, off); 597 598 if (m->m_len < sizeof(*ip6)) { 599 m = m_pullup(m, sizeof(*ip6)); 600 if (!m) 601 return; 602 } 603 ip6 = mtod(m, struct ip6_hdr *); 604 605 /* 606 * perform sanity check against inner src/dst. 607 * for source, perform ingress filter as well. 608 */ 609 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 610 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 611 m_freem(m); 612 return; 613 } 614 615 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 616 if ((ifp->if_flags & IFF_LINK1) != 0) 617 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 618 else 619 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 620 ip6->ip6_flow &= ~htonl(0xff << 20); 621 ip6->ip6_flow |= htonl((uint32_t)itos << 20); 622 623 m->m_pkthdr.rcvif = ifp; 624 625 bpf_mtap_af(ifp, AF_INET6, m); 626 627 /* 628 * Put the packet to the network layer input queue according to the 629 * specified address family. 630 * See net/if_gif.c for possible issues with packet processing 631 * reorder due to extra queueing. 632 */ 633 ifq = &ip6intrq; 634 isr = NETISR_IPV6; 635 636 s = splnet(); 637 if (IF_QFULL(ifq)) { 638 IF_DROP(ifq); /* update statistics */ 639 m_freem(m); 640 splx(s); 641 return; 642 } 643 IF_ENQUEUE(ifq, m); 644 schednetisr(isr); 645 ifp->if_ipackets++; 646 ifp->if_ibytes += m->m_pkthdr.len; 647 splx(s); 648 } 649 650 /* ARGSUSED */ 651 static void 652 stf_rtrequest(int cmd, struct rtentry *rt, 653 const struct rt_addrinfo *info) 654 { 655 if (rt != NULL) { 656 struct stf_softc *sc; 657 658 sc = LIST_FIRST(&stf_softc_list); 659 rt->rt_rmx.rmx_mtu = (sc != NULL) ? sc->sc_if.if_mtu : STF_MTU; 660 } 661 } 662 663 static int 664 stf_ioctl(struct ifnet *ifp, u_long cmd, void *data) 665 { 666 struct lwp *l = curlwp; /* XXX */ 667 struct ifaddr *ifa; 668 struct ifreq *ifr = data; 669 struct sockaddr_in6 *sin6; 670 int error; 671 672 error = 0; 673 switch (cmd) { 674 case SIOCINITIFADDR: 675 ifa = (struct ifaddr *)data; 676 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 677 error = EAFNOSUPPORT; 678 break; 679 } 680 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 681 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr) && 682 !isrfc1918addr(GET_V4(&sin6->sin6_addr))) { 683 ifa->ifa_rtrequest = stf_rtrequest; 684 ifp->if_flags |= IFF_UP; 685 } else 686 error = EINVAL; 687 break; 688 689 case SIOCADDMULTI: 690 case SIOCDELMULTI: 691 if (ifr != NULL && 692 ifreq_getaddr(cmd, ifr)->sa_family == AF_INET6) 693 ; 694 else 695 error = EAFNOSUPPORT; 696 break; 697 698 case SIOCSIFMTU: 699 error = kauth_authorize_network(l->l_cred, 700 KAUTH_NETWORK_INTERFACE, 701 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, KAUTH_ARG(cmd), 702 NULL); 703 if (error) 704 break; 705 if (ifr->ifr_mtu < STF_MTU_MIN || ifr->ifr_mtu > STF_MTU_MAX) 706 return EINVAL; 707 else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 708 error = 0; 709 break; 710 711 default: 712 error = ifioctl_common(ifp, cmd, data); 713 break; 714 } 715 716 return error; 717 } 718