1 /* $NetBSD: if_stf.c,v 1.109 2022/09/03 02:47:59 thorpej 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 1.109 2022/09/03 02:47:59 thorpej Exp $"); 79 80 #ifdef _KERNEL_OPT 81 #include "opt_inet.h" 82 #include "stf.h" 83 #endif 84 85 #ifndef INET6 86 #error "pseudo-device stf requires options INET6" 87 #endif 88 89 #include <sys/param.h> 90 #include <sys/systm.h> 91 #include <sys/socket.h> 92 #include <sys/sockio.h> 93 #include <sys/mbuf.h> 94 #include <sys/errno.h> 95 #include <sys/ioctl.h> 96 #include <sys/proc.h> 97 #include <sys/queue.h> 98 #include <sys/syslog.h> 99 #include <sys/device.h> 100 #include <sys/module.h> 101 102 #include <sys/cpu.h> 103 104 #include <net/if.h> 105 #include <net/route.h> 106 #include <net/if_types.h> 107 #include <net/if_stf.h> 108 109 #include <netinet/in.h> 110 #include <netinet/in_systm.h> 111 #include <netinet/ip.h> 112 #include <netinet/ip_var.h> 113 #include <netinet/in_var.h> 114 115 #include <netinet/ip6.h> 116 #include <netinet6/ip6_var.h> 117 #include <netinet6/in6_var.h> 118 #include <netinet/ip_ecn.h> 119 120 #include <netinet/ip_encap.h> 121 122 #include <net/bpf.h> 123 124 #include "ioconf.h" 125 126 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 127 #define GET_V4(x) ((const struct in_addr *)(&(x)->s6_addr16[1])) 128 129 struct stf_softc { 130 struct ifnet sc_if; /* common area */ 131 struct route sc_ro; 132 const struct encaptab *encap_cookie; 133 LIST_ENTRY(stf_softc) sc_list; 134 }; 135 136 static LIST_HEAD(, stf_softc) stf_softc_list; 137 138 static int stf_clone_create(struct if_clone *, int); 139 static int stf_clone_destroy(struct ifnet *); 140 141 struct if_clone stf_cloner = 142 IF_CLONE_INITIALIZER("stf", stf_clone_create, stf_clone_destroy); 143 144 static int ip_stf_ttl = STF_TTL; 145 146 extern struct domain inetdomain; 147 148 static const struct encapsw in_stf_encapsw = 149 { 150 .encapsw4 = { 151 .pr_input = in_stf_input, 152 .pr_ctlinput = NULL, 153 } 154 }; 155 156 static int stf_encapcheck(struct mbuf *, int, int, void *); 157 static struct in6_ifaddr *stf_getsrcifa6(struct ifnet *); 158 static int stf_output(struct ifnet *, struct mbuf *, const struct sockaddr *, 159 const struct rtentry *); 160 static int isrfc1918addr(const struct in_addr *); 161 static int stf_checkaddr4(struct stf_softc *, const struct in_addr *, 162 struct ifnet *); 163 static int stf_checkaddr6(struct stf_softc *, const struct in6_addr *, 164 struct ifnet *); 165 static void stf_rtrequest(int, struct rtentry *, const struct rt_addrinfo *); 166 static int stf_ioctl(struct ifnet *, u_long, void *); 167 168 /* ARGSUSED */ 169 void 170 stfattach(int count) 171 { 172 173 /* 174 * Nothing to do here, initialization is handled by the 175 * module initialization code in stfinit() below). 176 */ 177 } 178 179 static void 180 stfinit(void) 181 { 182 183 LIST_INIT(&stf_softc_list); 184 if_clone_attach(&stf_cloner); 185 } 186 187 static int 188 stfdetach(void) 189 { 190 int error = 0; 191 192 if (!LIST_EMPTY(&stf_softc_list)) 193 error = EBUSY; 194 195 if (error == 0) 196 if_clone_detach(&stf_cloner); 197 198 return error; 199 } 200 201 static int 202 stf_clone_create(struct if_clone *ifc, int unit) 203 { 204 struct stf_softc *sc; 205 int error; 206 207 sc = malloc(sizeof(struct stf_softc), M_DEVBUF, M_WAIT|M_ZERO); 208 if_initname(&sc->sc_if, ifc->ifc_name, unit); 209 210 error = encap_lock_enter(); 211 if (error) { 212 free(sc, M_DEVBUF); 213 return error; 214 } 215 216 if (LIST_FIRST(&stf_softc_list) != NULL) { 217 /* Only one stf interface is allowed. */ 218 encap_lock_exit(); 219 free(sc, M_DEVBUF); 220 return EEXIST; 221 } 222 223 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6, 224 stf_encapcheck, &in_stf_encapsw, sc); 225 encap_lock_exit(); 226 if (sc->encap_cookie == NULL) { 227 printf("%s: unable to attach encap\n", if_name(&sc->sc_if)); 228 free(sc, M_DEVBUF); 229 return EIO; /* XXX */ 230 } 231 232 sc->sc_if.if_mtu = STF_MTU; 233 sc->sc_if.if_flags = 0; 234 sc->sc_if.if_ioctl = stf_ioctl; 235 sc->sc_if.if_output = stf_output; 236 sc->sc_if.if_type = IFT_STF; 237 sc->sc_if.if_dlt = DLT_NULL; 238 if_attach(&sc->sc_if); 239 if_alloc_sadl(&sc->sc_if); 240 bpf_attach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 241 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list); 242 return 0; 243 } 244 245 static int 246 stf_clone_destroy(struct ifnet *ifp) 247 { 248 struct stf_softc *sc = (void *) ifp; 249 250 encap_lock_enter(); 251 LIST_REMOVE(sc, sc_list); 252 encap_detach(sc->encap_cookie); 253 encap_lock_exit(); 254 bpf_detach(ifp); 255 if_detach(ifp); 256 rtcache_free(&sc->sc_ro); 257 free(sc, M_DEVBUF); 258 259 return 0; 260 } 261 262 static int 263 stf_encapcheck(struct mbuf *m, int off, int proto, void *arg) 264 { 265 struct ip ip; 266 struct in6_ifaddr *ia6; 267 struct stf_softc *sc; 268 struct in_addr a, b; 269 270 sc = (struct stf_softc *)arg; 271 if (sc == NULL) 272 return 0; 273 274 if ((sc->sc_if.if_flags & IFF_UP) == 0) 275 return 0; 276 277 /* IFF_LINK0 means "no decapsulation" */ 278 if ((sc->sc_if.if_flags & IFF_LINK0) != 0) 279 return 0; 280 281 if (proto != IPPROTO_IPV6) 282 return 0; 283 284 m_copydata(m, 0, sizeof(ip), (void *)&ip); 285 286 if (ip.ip_v != 4) 287 return 0; 288 289 ia6 = stf_getsrcifa6(&sc->sc_if); 290 if (ia6 == NULL) 291 return 0; 292 293 /* 294 * check if IPv4 dst matches the IPv4 address derived from the 295 * local 6to4 address. 296 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 297 */ 298 if (memcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 299 sizeof(ip.ip_dst)) != 0) 300 return 0; 301 302 /* 303 * check if IPv4 src matches the IPv4 address derived from the 304 * local 6to4 address masked by prefixmask. 305 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 306 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 307 */ 308 memset(&a, 0, sizeof(a)); 309 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 310 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 311 b = ip.ip_src; 312 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 313 if (a.s_addr != b.s_addr) 314 return 0; 315 316 /* stf interface makes single side match only */ 317 return 32; 318 } 319 320 static struct in6_ifaddr * 321 stf_getsrcifa6(struct ifnet *ifp) 322 { 323 struct ifaddr *ifa; 324 struct in_ifaddr *ia4; 325 struct sockaddr_in6 *sin6; 326 struct in_addr in; 327 int s; 328 329 s = pserialize_read_enter(); 330 IFADDR_READER_FOREACH(ifa, ifp) { 331 if (ifa->ifa_addr->sa_family != AF_INET6) 332 continue; 333 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 334 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 335 continue; 336 337 memcpy(&in, GET_V4(&sin6->sin6_addr), sizeof(in)); 338 ia4 = in_get_ia(in); 339 if (ia4 == NULL) 340 continue; 341 342 pserialize_read_exit(s); 343 /* TODO NOMPSAFE */ 344 return (struct in6_ifaddr *)ifa; 345 } 346 pserialize_read_exit(s); 347 348 return NULL; 349 } 350 351 static int 352 stf_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 353 const struct rtentry *rt0) 354 { 355 struct rtentry *rt; 356 struct stf_softc *sc; 357 const struct sockaddr_in6 *dst6; 358 const struct in_addr *in4; 359 uint8_t tos; 360 struct ip *ip; 361 struct ip6_hdr *ip6; 362 struct in6_ifaddr *ia6; 363 union { 364 struct sockaddr dst; 365 struct sockaddr_in dst4; 366 } u; 367 368 sc = (struct stf_softc*)ifp; 369 dst6 = (const struct sockaddr_in6 *)dst; 370 371 /* just in case */ 372 if ((ifp->if_flags & IFF_UP) == 0) { 373 m_freem(m); 374 return ENETDOWN; 375 } 376 377 /* 378 * If we don't have an ip4 address that match my inner ip6 address, 379 * we shouldn't generate output. Without this check, we'll end up 380 * using wrong IPv4 source. 381 */ 382 ia6 = stf_getsrcifa6(ifp); 383 if (ia6 == NULL) { 384 m_freem(m); 385 if_statinc(ifp, if_oerrors); 386 return ENETDOWN; 387 } 388 389 if (m->m_len < sizeof(*ip6)) { 390 m = m_pullup(m, sizeof(*ip6)); 391 if (m == NULL) { 392 if_statinc(ifp, if_oerrors); 393 return ENOBUFS; 394 } 395 } 396 ip6 = mtod(m, struct ip6_hdr *); 397 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 398 399 /* 400 * Pickup the right outer dst addr from the list of candidates. 401 * ip6_dst has priority as it may be able to give us shorter IPv4 hops. 402 */ 403 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst)) 404 in4 = GET_V4(&ip6->ip6_dst); 405 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr)) 406 in4 = GET_V4(&dst6->sin6_addr); 407 else { 408 m_freem(m); 409 if_statinc(ifp, if_oerrors); 410 return ENETUNREACH; 411 } 412 413 bpf_mtap_af(ifp, AF_INET6, m, BPF_D_OUT); 414 415 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 416 if (m && m->m_len < sizeof(struct ip)) 417 m = m_pullup(m, sizeof(struct ip)); 418 if (m == NULL) { 419 if_statinc(ifp, if_oerrors); 420 return ENOBUFS; 421 } 422 ip = mtod(m, struct ip *); 423 424 memset(ip, 0, sizeof(*ip)); 425 426 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 427 &ip->ip_src, sizeof(ip->ip_src)); 428 memcpy(&ip->ip_dst, in4, sizeof(ip->ip_dst)); 429 ip->ip_p = IPPROTO_IPV6; 430 ip->ip_ttl = ip_stf_ttl; 431 ip->ip_len = htons(m->m_pkthdr.len); 432 if (ifp->if_flags & IFF_LINK1) 433 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 434 else 435 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos); 436 437 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 438 if ((rt = rtcache_lookup(&sc->sc_ro, &u.dst)) == NULL) { 439 m_freem(m); 440 if_statinc(ifp, if_oerrors); 441 return ENETUNREACH; 442 } 443 444 /* If the route constitutes infinite encapsulation, punt. */ 445 if (rt->rt_ifp == ifp) { 446 rtcache_unref(rt, &sc->sc_ro); 447 rtcache_free(&sc->sc_ro); 448 m_freem(m); 449 if_statinc(ifp, if_oerrors); 450 return ENETUNREACH; 451 } 452 rtcache_unref(rt, &sc->sc_ro); 453 454 if_statadd2(ifp, if_opackets, 1, 455 if_obytes, m->m_pkthdr.len - sizeof(struct ip)); 456 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 457 } 458 459 static int 460 isrfc1918addr(const struct in_addr *in) 461 { 462 /* 463 * returns 1 if private address range: 464 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 465 */ 466 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 || 467 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 || 468 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168) 469 return 1; 470 471 return 0; 472 } 473 474 static int 475 stf_checkaddr4(struct stf_softc *sc, const struct in_addr *in, 476 struct ifnet *inifp /*incoming interface*/) 477 { 478 struct in_ifaddr *ia4; 479 480 /* 481 * reject packets with the following address: 482 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 483 */ 484 if (IN_MULTICAST(in->s_addr)) 485 return -1; 486 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 487 case 0: case 127: case 255: 488 return -1; 489 } 490 491 /* 492 * reject packets with private address range. 493 * (requirement from RFC3056 section 2 1st paragraph) 494 */ 495 if (isrfc1918addr(in)) 496 return -1; 497 498 /* 499 * reject packet with IPv4 link-local (169.254.0.0/16), 500 * as suggested in draft-savola-v6ops-6to4-security-00.txt 501 */ 502 if (((ntohl(in->s_addr) & 0xff000000) >> 24) == 169 && 503 ((ntohl(in->s_addr) & 0x00ff0000) >> 16) == 254) 504 return -1; 505 506 /* 507 * reject packets with broadcast 508 */ 509 IN_ADDRLIST_READER_FOREACH(ia4) { 510 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 511 continue; 512 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 513 return -1; 514 } 515 516 /* 517 * perform ingress filter 518 */ 519 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) { 520 struct sockaddr_in sin; 521 struct rtentry *rt; 522 523 memset(&sin, 0, sizeof(sin)); 524 sin.sin_family = AF_INET; 525 sin.sin_len = sizeof(struct sockaddr_in); 526 sin.sin_addr = *in; 527 rt = rtalloc1((struct sockaddr *)&sin, 0); 528 if (!rt || rt->rt_ifp != inifp) { 529 #if 0 530 log(LOG_WARNING, "%s: packet from 0x%x dropped " 531 "due to ingress filter\n", if_name(&sc->sc_if), 532 (uint32_t)ntohl(sin.sin_addr.s_addr)); 533 #endif 534 if (rt) 535 rt_unref(rt); 536 return -1; 537 } 538 rt_unref(rt); 539 } 540 541 return 0; 542 } 543 544 static int 545 stf_checkaddr6(struct stf_softc *sc, const struct in6_addr *in6, 546 struct ifnet *inifp /*incoming interface*/) 547 { 548 549 /* 550 * check 6to4 addresses 551 */ 552 if (IN6_IS_ADDR_6TO4(in6)) 553 return stf_checkaddr4(sc, GET_V4(in6), inifp); 554 555 /* 556 * reject anything that look suspicious. the test is implemented 557 * in ip6_input too, but we check here as well to 558 * (1) reject bad packets earlier, and 559 * (2) to be safe against future ip6_input change. 560 */ 561 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 562 return -1; 563 564 /* 565 * reject link-local and site-local unicast 566 * as suggested in draft-savola-v6ops-6to4-security-00.txt 567 */ 568 if (IN6_IS_ADDR_LINKLOCAL(in6) || IN6_IS_ADDR_SITELOCAL(in6)) 569 return -1; 570 571 /* 572 * reject node-local and link-local multicast 573 * as suggested in draft-savola-v6ops-6to4-security-00.txt 574 */ 575 if (IN6_IS_ADDR_MC_NODELOCAL(in6) || IN6_IS_ADDR_MC_LINKLOCAL(in6)) 576 return -1; 577 578 return 0; 579 } 580 581 void 582 in_stf_input(struct mbuf *m, int off, int proto, void *eparg) 583 { 584 int s; 585 struct stf_softc *sc = eparg; 586 struct ip *ip; 587 struct ip6_hdr *ip6; 588 uint8_t otos, itos; 589 struct ifnet *ifp; 590 size_t pktlen; 591 592 KASSERT(sc != NULL); 593 594 if (proto != IPPROTO_IPV6) { 595 m_freem(m); 596 return; 597 } 598 599 ip = mtod(m, struct ip *); 600 601 if ((sc->sc_if.if_flags & IFF_UP) == 0) { 602 m_freem(m); 603 return; 604 } 605 606 ifp = &sc->sc_if; 607 608 /* 609 * perform sanity check against outer src/dst. 610 * for source, perform ingress filter as well. 611 */ 612 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 || 613 stf_checkaddr4(sc, &ip->ip_src, m_get_rcvif_NOMPSAFE(m)) < 0) { 614 m_freem(m); 615 return; 616 } 617 618 otos = ip->ip_tos; 619 m_adj(m, off); 620 621 if (m->m_len < sizeof(*ip6)) { 622 m = m_pullup(m, sizeof(*ip6)); 623 if (!m) 624 return; 625 } 626 ip6 = mtod(m, struct ip6_hdr *); 627 628 /* 629 * perform sanity check against inner src/dst. 630 * for source, perform ingress filter as well. 631 */ 632 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 || 633 stf_checkaddr6(sc, &ip6->ip6_src, m_get_rcvif_NOMPSAFE(m)) < 0) { 634 m_freem(m); 635 return; 636 } 637 638 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 639 if ((ifp->if_flags & IFF_LINK1) != 0) 640 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 641 else 642 ip_ecn_egress(ECN_NOCARE, &otos, &itos); 643 ip6->ip6_flow &= ~htonl(0xff << 20); 644 ip6->ip6_flow |= htonl((uint32_t)itos << 20); 645 646 pktlen = m->m_pkthdr.len; 647 m_set_rcvif(m, ifp); 648 649 bpf_mtap_af(ifp, AF_INET6, m, BPF_D_IN); 650 651 /* 652 * Put the packet to the network layer input queue according to the 653 * specified address family. 654 * See net/if_gif.c for possible issues with packet processing 655 * reorder due to extra queueing. 656 */ 657 658 s = splnet(); 659 if (__predict_true(pktq_enqueue(ip6_pktq, m, 0))) { 660 if_statadd2(ifp, if_ipackets, 1, if_ibytes, pktlen); 661 } else { 662 m_freem(m); 663 } 664 splx(s); 665 666 return; 667 } 668 669 /* ARGSUSED */ 670 static void 671 stf_rtrequest(int cmd, struct rtentry *rt, 672 const struct rt_addrinfo *info) 673 { 674 if (rt != NULL) { 675 struct stf_softc *sc; 676 677 sc = LIST_FIRST(&stf_softc_list); 678 rt->rt_rmx.rmx_mtu = (sc != NULL) ? sc->sc_if.if_mtu : STF_MTU; 679 } 680 } 681 682 static int 683 stf_ioctl(struct ifnet *ifp, u_long cmd, void *data) 684 { 685 struct ifaddr *ifa; 686 struct ifreq *ifr = data; 687 struct sockaddr_in6 *sin6; 688 int error; 689 690 error = 0; 691 switch (cmd) { 692 case SIOCINITIFADDR: 693 ifa = (struct ifaddr *)data; 694 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 695 error = EAFNOSUPPORT; 696 break; 697 } 698 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 699 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr) && 700 !isrfc1918addr(GET_V4(&sin6->sin6_addr))) { 701 ifa->ifa_rtrequest = stf_rtrequest; 702 ifp->if_flags |= IFF_UP; 703 } else 704 error = EINVAL; 705 break; 706 707 case SIOCADDMULTI: 708 case SIOCDELMULTI: 709 if (ifr != NULL && 710 ifreq_getaddr(cmd, ifr)->sa_family == AF_INET6) 711 ; 712 else 713 error = EAFNOSUPPORT; 714 break; 715 716 case SIOCSIFMTU: 717 if (ifr->ifr_mtu < STF_MTU_MIN || ifr->ifr_mtu > STF_MTU_MAX) 718 return EINVAL; 719 else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 720 error = 0; 721 break; 722 723 default: 724 error = ifioctl_common(ifp, cmd, data); 725 break; 726 } 727 728 return error; 729 } 730 731 /* 732 * Module infrastructure 733 */ 734 #include "if_module.h" 735 736 IF_MODULE(MODULE_CLASS_DRIVER, stf, NULL) 737
Indexes created Sun Sep 28 16:09:52 GMT 2025