1 /* $FreeBSD$ */ 2 /* $KAME: if_stf.c,v 1.73 2001/12/03 11:08:30 keiichi 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 "opt_inet.h" 78 #include "opt_inet6.h" 79 #include "opt_mac.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/mac.h> 86 #include <sys/mbuf.h> 87 #include <sys/errno.h> 88 #include <sys/kernel.h> 89 #include <sys/module.h> 90 #include <sys/protosw.h> 91 #include <sys/queue.h> 92 #include <machine/cpu.h> 93 94 #include <sys/malloc.h> 95 96 #include <net/if.h> 97 #include <net/if_clone.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_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 <net/bpf.h> 121 122 #define STFNAME "stf" 123 #define STFUNIT 0 124 125 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 126 127 /* 128 * XXX: Return a pointer with 16-bit aligned. Don't cast it to 129 * struct in_addr *; use bcopy() instead. 130 */ 131 #define GET_V4(x) ((caddr_t)(&(x)->s6_addr16[1])) 132 133 struct stf_softc { 134 struct ifnet *sc_ifp; 135 union { 136 struct route __sc_ro4; 137 struct route_in6 __sc_ro6; /* just for safety */ 138 } __sc_ro46; 139 #define sc_ro __sc_ro46.__sc_ro4 140 const struct encaptab *encap_cookie; 141 }; 142 #define STF2IFP(sc) ((sc)->sc_ifp) 143 144 /* 145 * XXXRW: Note that mutable fields in the softc are not currently locked: 146 * in particular, sc_ro needs to be protected from concurrent entrance 147 * of stf_output(). 148 */ 149 static MALLOC_DEFINE(M_STF, STFNAME, "6to4 Tunnel Interface"); 150 static const int ip_stf_ttl = 40; 151 152 extern struct domain inetdomain; 153 struct protosw in_stf_protosw = { 154 .pr_type = SOCK_RAW, 155 .pr_domain = &inetdomain, 156 .pr_protocol = IPPROTO_IPV6, 157 .pr_flags = PR_ATOMIC|PR_ADDR, 158 .pr_input = in_stf_input, 159 .pr_output = (pr_output_t *)rip_output, 160 .pr_ctloutput = rip_ctloutput, 161 .pr_usrreqs = &rip_usrreqs 162 }; 163 164 static char *stfnames[] = {"stf0", "stf", "6to4", NULL}; 165 166 static int stfmodevent(module_t, int, void *); 167 static int stf_encapcheck(const struct mbuf *, int, int, void *); 168 static struct in6_ifaddr *stf_getsrcifa6(struct ifnet *); 169 static int stf_output(struct ifnet *, struct mbuf *, struct sockaddr *, 170 struct rtentry *); 171 static int isrfc1918addr(struct in_addr *); 172 static int stf_checkaddr4(struct stf_softc *, struct in_addr *, 173 struct ifnet *); 174 static int stf_checkaddr6(struct stf_softc *, struct in6_addr *, 175 struct ifnet *); 176 static void stf_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 177 static int stf_ioctl(struct ifnet *, u_long, caddr_t); 178 179 static int stf_clone_match(struct if_clone *, const char *); 180 static int stf_clone_create(struct if_clone *, char *, size_t, caddr_t); 181 static int stf_clone_destroy(struct if_clone *, struct ifnet *); 182 struct if_clone stf_cloner = IFC_CLONE_INITIALIZER(STFNAME, NULL, 0, 183 NULL, stf_clone_match, stf_clone_create, stf_clone_destroy); 184 185 static int 186 stf_clone_match(struct if_clone *ifc, const char *name) 187 { 188 int i; 189 190 for(i = 0; stfnames[i] != NULL; i++) { 191 if (strcmp(stfnames[i], name) == 0) 192 return (1); 193 } 194 195 return (0); 196 } 197 198 static int 199 stf_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params) 200 { 201 int err, unit; 202 struct stf_softc *sc; 203 struct ifnet *ifp; 204 205 /* 206 * We can only have one unit, but since unit allocation is 207 * already locked, we use it to keep from allocating extra 208 * interfaces. 209 */ 210 unit = STFUNIT; 211 err = ifc_alloc_unit(ifc, &unit); 212 if (err != 0) 213 return (err); 214 215 sc = malloc(sizeof(struct stf_softc), M_STF, M_WAITOK | M_ZERO); 216 ifp = STF2IFP(sc) = if_alloc(IFT_STF); 217 if (ifp == NULL) { 218 free(sc, M_STF); 219 ifc_free_unit(ifc, unit); 220 return (ENOSPC); 221 } 222 ifp->if_softc = sc; 223 224 /* 225 * Set the name manually rather then using if_initname because 226 * we don't conform to the default naming convention for interfaces. 227 */ 228 strlcpy(ifp->if_xname, name, IFNAMSIZ); 229 ifp->if_dname = ifc->ifc_name; 230 ifp->if_dunit = IF_DUNIT_NONE; 231 232 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 233 stf_encapcheck, &in_stf_protosw, sc); 234 if (sc->encap_cookie == NULL) { 235 if_printf(ifp, "attach failed\n"); 236 free(sc, M_STF); 237 ifc_free_unit(ifc, unit); 238 return (ENOMEM); 239 } 240 241 ifp->if_mtu = IPV6_MMTU; 242 ifp->if_ioctl = stf_ioctl; 243 ifp->if_output = stf_output; 244 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 245 if_attach(ifp); 246 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 247 return (0); 248 } 249 250 static int 251 stf_clone_destroy(struct if_clone *ifc, struct ifnet *ifp) 252 { 253 struct stf_softc *sc = ifp->if_softc; 254 int err; 255 256 err = encap_detach(sc->encap_cookie); 257 KASSERT(err == 0, ("Unexpected error detaching encap_cookie")); 258 bpfdetach(ifp); 259 if_detach(ifp); 260 if_free(ifp); 261 262 free(sc, M_STF); 263 ifc_free_unit(ifc, STFUNIT); 264 265 return (0); 266 } 267 268 static int 269 stfmodevent(mod, type, data) 270 module_t mod; 271 int type; 272 void *data; 273 { 274 275 switch (type) { 276 case MOD_LOAD: 277 if_clone_attach(&stf_cloner); 278 break; 279 case MOD_UNLOAD: 280 if_clone_detach(&stf_cloner); 281 break; 282 default: 283 return (EOPNOTSUPP); 284 } 285 286 return (0); 287 } 288 289 static moduledata_t stf_mod = { 290 "if_stf", 291 stfmodevent, 292 0 293 }; 294 295 DECLARE_MODULE(if_stf, stf_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 296 297 static int 298 stf_encapcheck(m, off, proto, arg) 299 const struct mbuf *m; 300 int off; 301 int proto; 302 void *arg; 303 { 304 struct ip ip; 305 struct in6_ifaddr *ia6; 306 struct stf_softc *sc; 307 struct in_addr a, b, mask; 308 309 sc = (struct stf_softc *)arg; 310 if (sc == NULL) 311 return 0; 312 313 if ((STF2IFP(sc)->if_flags & IFF_UP) == 0) 314 return 0; 315 316 /* IFF_LINK0 means "no decapsulation" */ 317 if ((STF2IFP(sc)->if_flags & IFF_LINK0) != 0) 318 return 0; 319 320 if (proto != IPPROTO_IPV6) 321 return 0; 322 323 /* LINTED const cast */ 324 m_copydata((struct mbuf *)(uintptr_t)m, 0, sizeof(ip), (caddr_t)&ip); 325 326 if (ip.ip_v != 4) 327 return 0; 328 329 ia6 = stf_getsrcifa6(STF2IFP(sc)); 330 if (ia6 == NULL) 331 return 0; 332 333 /* 334 * check if IPv4 dst matches the IPv4 address derived from the 335 * local 6to4 address. 336 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 337 */ 338 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 339 sizeof(ip.ip_dst)) != 0) 340 return 0; 341 342 /* 343 * check if IPv4 src matches the IPv4 address derived from the 344 * local 6to4 address masked by prefixmask. 345 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 346 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 347 */ 348 bzero(&a, sizeof(a)); 349 bcopy(GET_V4(&ia6->ia_addr.sin6_addr), &a, sizeof(a)); 350 bcopy(GET_V4(&ia6->ia_prefixmask.sin6_addr), &mask, sizeof(mask)); 351 a.s_addr &= mask.s_addr; 352 b = ip.ip_src; 353 b.s_addr &= mask.s_addr; 354 if (a.s_addr != b.s_addr) 355 return 0; 356 357 /* stf interface makes single side match only */ 358 return 32; 359 } 360 361 static struct in6_ifaddr * 362 stf_getsrcifa6(ifp) 363 struct ifnet *ifp; 364 { 365 struct ifaddr *ia; 366 struct in_ifaddr *ia4; 367 struct sockaddr_in6 *sin6; 368 struct in_addr in; 369 370 TAILQ_FOREACH(ia, &ifp->if_addrlist, ifa_list) { 371 if (ia->ifa_addr->sa_family != AF_INET6) 372 continue; 373 sin6 = (struct sockaddr_in6 *)ia->ifa_addr; 374 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 375 continue; 376 377 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 378 LIST_FOREACH(ia4, INADDR_HASH(in.s_addr), ia_hash) 379 if (ia4->ia_addr.sin_addr.s_addr == in.s_addr) 380 break; 381 if (ia4 == NULL) 382 continue; 383 384 return (struct in6_ifaddr *)ia; 385 } 386 387 return NULL; 388 } 389 390 static int 391 stf_output(ifp, m, dst, rt) 392 struct ifnet *ifp; 393 struct mbuf *m; 394 struct sockaddr *dst; 395 struct rtentry *rt; 396 { 397 struct stf_softc *sc; 398 struct sockaddr_in6 *dst6; 399 struct in_addr in4; 400 caddr_t ptr; 401 struct sockaddr_in *dst4; 402 u_int8_t tos; 403 struct ip *ip; 404 struct ip6_hdr *ip6; 405 struct in6_ifaddr *ia6; 406 u_int32_t af; 407 #ifdef MAC 408 int error; 409 410 error = mac_check_ifnet_transmit(ifp, m); 411 if (error) { 412 m_freem(m); 413 return (error); 414 } 415 #endif 416 417 sc = ifp->if_softc; 418 dst6 = (struct sockaddr_in6 *)dst; 419 420 /* just in case */ 421 if ((ifp->if_flags & IFF_UP) == 0) { 422 m_freem(m); 423 ifp->if_oerrors++; 424 return ENETDOWN; 425 } 426 427 /* 428 * If we don't have an ip4 address that match my inner ip6 address, 429 * we shouldn't generate output. Without this check, we'll end up 430 * using wrong IPv4 source. 431 */ 432 ia6 = stf_getsrcifa6(ifp); 433 if (ia6 == NULL) { 434 m_freem(m); 435 ifp->if_oerrors++; 436 return ENETDOWN; 437 } 438 439 if (m->m_len < sizeof(*ip6)) { 440 m = m_pullup(m, sizeof(*ip6)); 441 if (!m) { 442 ifp->if_oerrors++; 443 return ENOBUFS; 444 } 445 } 446 ip6 = mtod(m, struct ip6_hdr *); 447 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 448 449 /* 450 * BPF writes need to be handled specially. 451 * This is a null operation, nothing here checks dst->sa_family. 452 */ 453 if (dst->sa_family == AF_UNSPEC) { 454 bcopy(dst->sa_data, &af, sizeof(af)); 455 dst->sa_family = af; 456 } 457 458 /* 459 * Pickup the right outer dst addr from the list of candidates. 460 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 461 */ 462 ptr = NULL; 463 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 464 ptr = GET_V4(&ip6->ip6_dst); 465 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 466 ptr = GET_V4(&dst6->sin6_addr); 467 else { 468 m_freem(m); 469 ifp->if_oerrors++; 470 return ENETUNREACH; 471 } 472 bcopy(ptr, &in4, sizeof(in4)); 473 474 if (bpf_peers_present(ifp->if_bpf)) { 475 /* 476 * We need to prepend the address family as 477 * a four byte field. Cons up a dummy header 478 * to pacify bpf. This is safe because bpf 479 * will only read from the mbuf (i.e., it won't 480 * try to free it or keep a pointer a to it). 481 */ 482 af = AF_INET6; 483 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m); 484 } 485 486 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 487 if (m && m->m_len < sizeof(struct ip)) 488 m = m_pullup(m, sizeof(struct ip)); 489 if (m == NULL) { 490 ifp->if_oerrors++; 491 return ENOBUFS; 492 } 493 ip = mtod(m, struct ip *); 494 495 bzero(ip, sizeof(*ip)); 496 497 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 498 &ip->ip_src, sizeof(ip->ip_src)); 499 bcopy(&in4, &ip->ip_dst, sizeof(ip->ip_dst)); 500 ip->ip_p = IPPROTO_IPV6; 501 ip->ip_ttl = ip_stf_ttl; 502 ip->ip_len = m->m_pkthdr.len; /*host order*/ 503 if (ifp->if_flags & IFF_LINK1) 504 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 505 else 506 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 507 508 /* 509 * XXXRW: Locking of sc_ro required. 510 */ 511 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst; 512 if (dst4->sin_family != AF_INET || 513 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) { 514 /* cache route doesn't match */ 515 dst4->sin_family = AF_INET; 516 dst4->sin_len = sizeof(struct sockaddr_in); 517 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr)); 518 if (sc->sc_ro.ro_rt) { 519 RTFREE(sc->sc_ro.ro_rt); 520 sc->sc_ro.ro_rt = NULL; 521 } 522 } 523 524 if (sc->sc_ro.ro_rt == NULL) { 525 rtalloc(&sc->sc_ro); 526 if (sc->sc_ro.ro_rt == NULL) { 527 m_freem(m); 528 ifp->if_oerrors++; 529 return ENETUNREACH; 530 } 531 } 532 533 ifp->if_opackets++; 534 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 535 } 536 537 static int 538 isrfc1918addr(in) 539 struct in_addr *in; 540 { 541 /* 542 * returns 1 if private address range: 543 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 544 */ 545 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 || 546 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 || 547 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168) 548 return 1; 549 550 return 0; 551 } 552 553 static int 554 stf_checkaddr4(sc, in, inifp) 555 struct stf_softc *sc; 556 struct in_addr *in; 557 struct ifnet *inifp; /* incoming interface */ 558 { 559 struct in_ifaddr *ia4; 560 561 /* 562 * reject packets with the following address: 563 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 564 */ 565 if (IN_MULTICAST(ntohl(in->s_addr))) 566 return -1; 567 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 568 case 0: case 127: case 255: 569 return -1; 570 } 571 572 /* 573 * reject packets with private address range. 574 * (requirement from RFC3056 section 2 1st paragraph) 575 */ 576 if (isrfc1918addr(in)) 577 return -1; 578 579 /* 580 * reject packets with broadcast 581 */ 582 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 583 ia4; 584 ia4 = TAILQ_NEXT(ia4, ia_link)) 585 { 586 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 587 continue; 588 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 589 return -1; 590 } 591 592 /* 593 * perform ingress filter 594 */ 595 if (sc && (STF2IFP(sc)->if_flags & IFF_LINK2) == 0 && inifp) { 596 struct sockaddr_in sin; 597 struct rtentry *rt; 598 599 bzero(&sin, sizeof(sin)); 600 sin.sin_family = AF_INET; 601 sin.sin_len = sizeof(struct sockaddr_in); 602 sin.sin_addr = *in; 603 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 604 if (!rt || rt->rt_ifp != inifp) { 605 #if 0 606 log(LOG_WARNING, "%s: packet from 0x%x dropped " 607 "due to ingress filter\n", if_name(STF2IFP(sc)), 608 (u_int32_t)ntohl(sin.sin_addr.s_addr)); 609 #endif 610 if (rt) 611 rtfree(rt); 612 return -1; 613 } 614 rtfree(rt); 615 } 616 617 return 0; 618 } 619 620 static int 621 stf_checkaddr6(sc, in6, inifp) 622 struct stf_softc *sc; 623 struct in6_addr *in6; 624 struct ifnet *inifp; /* incoming interface */ 625 { 626 /* 627 * check 6to4 addresses 628 */ 629 if (IN6_IS_ADDR_6TO4(in6)) { 630 struct in_addr in4; 631 bcopy(GET_V4(in6), &in4, sizeof(in4)); 632 return stf_checkaddr4(sc, &in4, inifp); 633 } 634 635 /* 636 * reject anything that look suspicious. the test is implemented 637 * in ip6_input too, but we check here as well to 638 * (1) reject bad packets earlier, and 639 * (2) to be safe against future ip6_input change. 640 */ 641 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 642 return -1; 643 644 return 0; 645 } 646 647 void 648 in_stf_input(m, off) 649 struct mbuf *m; 650 int off; 651 { 652 int proto; 653 struct stf_softc *sc; 654 struct ip *ip; 655 struct ip6_hdr *ip6; 656 u_int8_t otos, itos; 657 struct ifnet *ifp; 658 659 proto = mtod(m, struct ip *)->ip_p; 660 661 if (proto != IPPROTO_IPV6) { 662 m_freem(m); 663 return; 664 } 665 666 ip = mtod(m, struct ip *); 667 668 sc = (struct stf_softc *)encap_getarg(m); 669 670 if (sc == NULL || (STF2IFP(sc)->if_flags & IFF_UP) == 0) { 671 m_freem(m); 672 return; 673 } 674 675 ifp = STF2IFP(sc); 676 677 #ifdef MAC 678 mac_create_mbuf_from_ifnet(ifp, m); 679 #endif 680 681 /* 682 * perform sanity check against outer src/dst. 683 * for source, perform ingress filter as well. 684 */ 685 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 686 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) { 687 m_freem(m); 688 return; 689 } 690 691 otos = ip->ip_tos; 692 m_adj(m, off); 693 694 if (m->m_len < sizeof(*ip6)) { 695 m = m_pullup(m, sizeof(*ip6)); 696 if (!m) 697 return; 698 } 699 ip6 = mtod(m, struct ip6_hdr *); 700 701 /* 702 * perform sanity check against inner src/dst. 703 * for source, perform ingress filter as well. 704 */ 705 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 706 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 707 m_freem(m); 708 return; 709 } 710 711 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 712 if ((ifp->if_flags & IFF_LINK1) != 0) 713 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 714 else 715 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 716 ip6->ip6_flow &= ~htonl(0xff << 20); 717 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 718 719 m->m_pkthdr.rcvif = ifp; 720 721 if (bpf_peers_present(ifp->if_bpf)) { 722 /* 723 * We need to prepend the address family as 724 * a four byte field. Cons up a dummy header 725 * to pacify bpf. This is safe because bpf 726 * will only read from the mbuf (i.e., it won't 727 * try to free it or keep a pointer a to it). 728 */ 729 u_int32_t af = AF_INET6; 730 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m); 731 } 732 733 /* 734 * Put the packet to the network layer input queue according to the 735 * specified address family. 736 * See net/if_gif.c for possible issues with packet processing 737 * reorder due to extra queueing. 738 */ 739 ifp->if_ipackets++; 740 ifp->if_ibytes += m->m_pkthdr.len; 741 netisr_dispatch(NETISR_IPV6, m); 742 } 743 744 /* ARGSUSED */ 745 static void 746 stf_rtrequest(cmd, rt, info) 747 int cmd; 748 struct rtentry *rt; 749 struct rt_addrinfo *info; 750 { 751 RT_LOCK_ASSERT(rt); 752 rt->rt_rmx.rmx_mtu = IPV6_MMTU; 753 } 754 755 static int 756 stf_ioctl(ifp, cmd, data) 757 struct ifnet *ifp; 758 u_long cmd; 759 caddr_t data; 760 { 761 struct ifaddr *ifa; 762 struct ifreq *ifr; 763 struct sockaddr_in6 *sin6; 764 struct in_addr addr; 765 int error; 766 767 error = 0; 768 switch (cmd) { 769 case SIOCSIFADDR: 770 ifa = (struct ifaddr *)data; 771 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 772 error = EAFNOSUPPORT; 773 break; 774 } 775 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 776 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) { 777 error = EINVAL; 778 break; 779 } 780 bcopy(GET_V4(&sin6->sin6_addr), &addr, sizeof(addr)); 781 if (isrfc1918addr(&addr)) { 782 error = EINVAL; 783 break; 784 } 785 786 ifa->ifa_rtrequest = stf_rtrequest; 787 ifp->if_flags |= IFF_UP; 788 break; 789 790 case SIOCADDMULTI: 791 case SIOCDELMULTI: 792 ifr = (struct ifreq *)data; 793 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 794 ; 795 else 796 error = EAFNOSUPPORT; 797 break; 798 799 default: 800 error = EINVAL; 801 break; 802 } 803 804 return error; 805 } 806