if_stf.c revision 1.4
1 /* $NetBSD: if_stf.c,v 1.4 2000/06/10 08:02:20 itojun Exp $ */ 2 /* $KAME: if_stf.c,v 1.39 2000/06/07 23:35:18 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-6to4-06.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 * Starting from 04 draft, the specification suggests how to construct 64 * link-local address for 6to4 interface. 65 * However, it seems to have no real use and does not help the above symptom 66 * much. Even if we assign link-locals to interface, we cannot really 67 * use link-local unicast/multicast on top of 6to4 cloud, and the above 68 * analysis does not change. 69 * 70 * 6to4 interface has security issues. Refer to 71 * http://playground.iijlab.net/i-d/draft-itojun-ipv6-transition-abuse-00.txt 72 * for details. The code tries to filter out some of malicious packets. 73 * Note that there is no way to be 100% secure. 74 */ 75 76 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 77 #include "opt_inet.h" 78 #include "opt_inet6.h" 79 #endif 80 #ifdef __NetBSD__ 81 #include "opt_inet.h" 82 #endif 83 84 #include <sys/param.h> 85 #include <sys/systm.h> 86 #include <sys/socket.h> 87 #include <sys/sockio.h> 88 #include <sys/mbuf.h> 89 #include <sys/errno.h> 90 #if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) 91 #include <sys/ioctl.h> 92 #endif 93 #include <sys/protosw.h> 94 #ifdef __FreeBSD__ 95 #include <sys/kernel.h> 96 #endif 97 #include <machine/cpu.h> 98 99 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 100 #include <sys/malloc.h> 101 #endif 102 103 #include <net/if.h> 104 #include <net/route.h> 105 #include <net/netisr.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_gif.h> 118 #include <netinet6/in6_var.h> 119 #include <netinet/ip_ecn.h> 120 121 #include <netinet/ip_encap.h> 122 123 #include <machine/stdarg.h> 124 125 #include <net/net_osdep.h> 126 127 #if defined(__FreeBSD__) && __FreeBSD__ >= 4 128 #include "bpf.h" 129 #define NBPFILTER NBPF 130 #else 131 #include "bpfilter.h" 132 #endif 133 #include "stf.h" 134 #include "gif.h" /*XXX*/ 135 136 #if NBPFILTER > 0 137 #include <net/bpf.h> 138 #endif 139 140 #if NGIF > 0 141 #include <net/if_gif.h> 142 #endif 143 144 #if NSTF > 0 145 #if NSTF != 1 146 # error only single stf interface allowed 147 #endif 148 149 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002) 150 #define GET_V4(x) ((struct in_addr *)(&(x)->s6_addr16[1])) 151 152 struct stf_softc { 153 struct ifnet sc_if; /* common area */ 154 union { 155 struct route __sc_ro4; 156 struct route_in6 __sc_ro6; /* just for safety */ 157 } __sc_ro46; 158 #define sc_ro __sc_ro46.__sc_ro4 159 const struct encaptab *encap_cookie; 160 }; 161 162 static struct stf_softc *stf; 163 static int nstf; 164 165 #if NGIF > 0 166 extern int ip_gif_ttl; /*XXX*/ 167 #else 168 static int ip_gif_ttl = 40; /*XXX*/ 169 #endif 170 171 extern struct protosw in_stf_protosw; 172 173 #ifdef __FreeBSD__ 174 void stfattach __P((void *)); 175 #else 176 void stfattach __P((int)); 177 #endif 178 static int stf_encapcheck __P((const struct mbuf *, int, int, void *)); 179 static struct in6_ifaddr *stf_getsrcifa6 __P((struct ifnet *)); 180 static int stf_output __P((struct ifnet *, struct mbuf *, struct sockaddr *, 181 struct rtentry *)); 182 static int stf_checkaddr4 __P((struct in_addr *, struct ifnet *)); 183 static int stf_checkaddr6 __P((struct in6_addr *, struct ifnet *)); 184 #if defined(__bsdi__) && _BSDI_VERSION >= 199802 185 static void stf_rtrequest __P((int, struct rtentry *, struct rt_addrinfo *)); 186 #else 187 static void stf_rtrequest __P((int, struct rtentry *, struct sockaddr *)); 188 #endif 189 #if defined(__FreeBSD__) && __FreeBSD__ < 3 190 static int stf_ioctl __P((struct ifnet *, int, caddr_t)); 191 #else 192 static int stf_ioctl __P((struct ifnet *, u_long, caddr_t)); 193 #endif 194 195 void 196 stfattach(dummy) 197 #ifdef __FreeBSD__ 198 void *dummy; 199 #else 200 int dummy; 201 #endif 202 { 203 struct stf_softc *sc; 204 int i; 205 const struct encaptab *p; 206 207 #ifdef __NetBSD__ 208 nstf = dummy; 209 #else 210 nstf = NSTF; 211 #endif 212 stf = malloc(nstf * sizeof(struct stf_softc), M_DEVBUF, M_WAIT); 213 bzero(stf, nstf * sizeof(struct stf_softc)); 214 sc = stf; 215 216 /* XXX just in case... */ 217 for (i = 0; i < nstf; i++) { 218 sc = &stf[i]; 219 bzero(sc, sizeof(*sc)); 220 #if defined(__NetBSD__) || defined(__OpenBSD__) 221 sprintf(sc->sc_if.if_xname, "stf%d", i); 222 #else 223 sc->sc_if.if_name = "stf"; 224 sc->sc_if.if_unit = i; 225 #endif 226 227 p = encap_attach_func(AF_INET, IPPROTO_IPV6, stf_encapcheck, 228 &in_stf_protosw, sc); 229 if (p == NULL) { 230 printf("%s: attach failed\n", if_name(&sc->sc_if)); 231 continue; 232 } 233 sc->encap_cookie = p; 234 235 sc->sc_if.if_mtu = IPV6_MMTU; 236 sc->sc_if.if_flags = 0; 237 sc->sc_if.if_ioctl = stf_ioctl; 238 sc->sc_if.if_output = stf_output; 239 sc->sc_if.if_type = IFT_STF; 240 #if defined(__FreeBSD__) && __FreeBSD__ >= 4 241 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN; 242 #endif 243 if_attach(&sc->sc_if); 244 #if NBPFILTER > 0 245 #ifdef HAVE_OLD_BPF 246 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int)); 247 #else 248 bpfattach(&sc->sc_if.if_bpf, &sc->sc_if, DLT_NULL, sizeof(u_int)); 249 #endif 250 #endif 251 } 252 } 253 254 #ifdef __FreeBSD__ 255 PSEUDO_SET(stfattach, if_stf); 256 #endif 257 258 static int 259 stf_encapcheck(m, off, proto, arg) 260 const struct mbuf *m; 261 int off; 262 int proto; 263 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 if (proto != IPPROTO_IPV6) 278 return 0; 279 280 /* LINTED const cast */ 281 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); 282 283 if (ip.ip_v != 4) 284 return 0; 285 286 ia6 = stf_getsrcifa6(&sc->sc_if); 287 if (ia6 == NULL) 288 return 0; 289 290 /* 291 * check if IPv4 dst matches the IPv4 address derived from the 292 * local 6to4 address. 293 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:... 294 */ 295 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst, 296 sizeof(ip.ip_dst)) != 0) 297 return 0; 298 299 /* 300 * check if IPv4 src matches the IPv4 address derived from the 301 * local 6to4 address masked by prefixmask. 302 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24 303 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24 304 */ 305 bzero(&a, sizeof(a)); 306 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr; 307 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 308 b = ip.ip_src; 309 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr; 310 if (a.s_addr != b.s_addr) 311 return 0; 312 313 /* stf interface makes single side match only */ 314 return 32; 315 } 316 317 static struct in6_ifaddr * 318 stf_getsrcifa6(ifp) 319 struct ifnet *ifp; 320 { 321 struct ifaddr *ia; 322 struct in_ifaddr *ia4; 323 struct sockaddr_in6 *sin6; 324 struct in_addr in; 325 326 #if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3) 327 for (ia = ifp->if_addrlist; ia; ia = ia->ifa_next) 328 #else 329 for (ia = ifp->if_addrlist.tqh_first; 330 ia; 331 ia = ia->ifa_list.tqe_next) 332 #endif 333 { 334 if (ia->ifa_addr == NULL) 335 continue; 336 if (ia->ifa_addr->sa_family != AF_INET6) 337 continue; 338 sin6 = (struct sockaddr_in6 *)ia->ifa_addr; 339 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) 340 continue; 341 342 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in)); 343 #ifdef __NetBSD__ 344 INADDR_TO_IA(in, ia4); 345 #else 346 #ifdef __OpenBSD__ 347 for (ia4 = in_ifaddr.tqh_first; 348 ia4; 349 ia4 = ia4->ia_list.tqe_next) 350 #elif defined(__FreeBSD__) && __FreeBSD__ >= 3 351 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 352 ia4; 353 ia4 = TAILQ_NEXT(ia4, ia_link)) 354 #else 355 for (ia4 = in_ifaddr; ia4 != NULL; ia4 = ia4->ia_next) 356 #endif 357 { 358 if (ia4->ia_addr.sin_addr.s_addr == in.s_addr) 359 break; 360 } 361 #endif 362 if (ia4 == NULL) 363 continue; 364 365 return (struct in6_ifaddr *)ia; 366 } 367 368 return NULL; 369 } 370 371 static int 372 stf_output(ifp, m, dst, rt) 373 struct ifnet *ifp; 374 struct mbuf *m; 375 struct sockaddr *dst; 376 struct rtentry *rt; 377 { 378 struct stf_softc *sc; 379 struct sockaddr_in6 *dst6; 380 struct sockaddr_in *dst4; 381 u_int8_t tos; 382 struct ip *ip; 383 struct ip6_hdr *ip6; 384 struct in6_ifaddr *ia6; 385 386 sc = (struct stf_softc*)ifp; 387 dst6 = (struct sockaddr_in6 *)dst; 388 389 /* just in case */ 390 if ((ifp->if_flags & IFF_UP) == 0) { 391 m_freem(m); 392 return ENETDOWN; 393 } 394 395 /* 396 * If we don't have an ip4 address that match my inner ip6 address, 397 * we shouldn't generate output. Without this check, we'll end up 398 * using wrong IPv4 source. 399 */ 400 ia6 = stf_getsrcifa6(ifp); 401 if (ia6 == NULL) { 402 m_freem(m); 403 return ENETDOWN; 404 } 405 406 if (m->m_len < sizeof(*ip6)) { 407 m = m_pullup(m, sizeof(*ip6)); 408 if (!m) 409 return ENOBUFS; 410 } 411 ip6 = mtod(m, struct ip6_hdr *); 412 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 413 414 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 415 if (m && m->m_len < sizeof(struct ip)) 416 m = m_pullup(m, sizeof(struct ip)); 417 if (m == NULL) 418 return ENOBUFS; 419 ip = mtod(m, struct ip *); 420 421 bzero(ip, sizeof(*ip)); 422 423 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr), 424 &ip->ip_src, sizeof(ip->ip_src)); 425 bcopy(GET_V4(&dst6->sin6_addr), &ip->ip_dst, sizeof(ip->ip_dst)); 426 ip->ip_p = IPPROTO_IPV6; 427 ip->ip_ttl = ip_gif_ttl; /*XXX*/ 428 ip->ip_len = m->m_pkthdr.len; /*host order*/ 429 if (ifp->if_flags & IFF_LINK1) 430 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos); 431 432 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst; 433 if (dst4->sin_family != AF_INET || 434 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) { 435 /* cache route doesn't match */ 436 dst4->sin_family = AF_INET; 437 dst4->sin_len = sizeof(struct sockaddr_in); 438 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr)); 439 if (sc->sc_ro.ro_rt) { 440 RTFREE(sc->sc_ro.ro_rt); 441 sc->sc_ro.ro_rt = NULL; 442 } 443 } 444 445 if (sc->sc_ro.ro_rt == NULL) { 446 rtalloc(&sc->sc_ro); 447 if (sc->sc_ro.ro_rt == NULL) { 448 m_freem(m); 449 return ENETUNREACH; 450 } 451 } 452 453 #ifndef __OpenBSD__ 454 return ip_output(m, NULL, &sc->sc_ro, 0, NULL); 455 #else 456 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL); 457 #endif 458 } 459 460 static int 461 stf_checkaddr4(in, ifp) 462 struct in_addr *in; 463 struct ifnet *ifp; /* incoming interface */ 464 { 465 struct in_ifaddr *ia4; 466 467 /* 468 * reject packets with the following address: 469 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8 470 */ 471 if (IN_MULTICAST(in->s_addr)) 472 return -1; 473 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) { 474 case 0: case 127: case 255: 475 return -1; 476 } 477 478 /* 479 * reject packets with broadcast 480 */ 481 #if defined(__OpenBSD__) || defined(__NetBSD__) 482 for (ia4 = in_ifaddr.tqh_first; ia4; ia4 = ia4->ia_list.tqe_next) 483 #elif defined(__FreeBSD__) && __FreeBSD__ >= 3 484 for (ia4 = TAILQ_FIRST(&in_ifaddrhead); 485 ia4; 486 ia4 = TAILQ_NEXT(ia4, ia_link)) 487 #else 488 for (ia4 = in_ifaddr; ia4 != NULL; ia4 = ia4->ia_next) 489 #endif 490 { 491 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) 492 continue; 493 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) 494 return -1; 495 } 496 497 /* 498 * perform ingress filter 499 */ 500 if (ifp) { 501 struct sockaddr_in sin; 502 struct rtentry *rt; 503 504 bzero(&sin, sizeof(sin)); 505 sin.sin_family = AF_INET; 506 sin.sin_len = sizeof(struct sockaddr_in); 507 sin.sin_addr = *in; 508 #ifdef __FreeBSD__ 509 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 510 #else 511 rt = rtalloc1((struct sockaddr *)&sin, 0); 512 #endif 513 if (!rt) 514 return -1; 515 if (rt->rt_ifp != ifp) { 516 rtfree(rt); 517 return -1; 518 } 519 rtfree(rt); 520 } 521 522 return 0; 523 } 524 525 static int 526 stf_checkaddr6(in6, ifp) 527 struct in6_addr *in6; 528 struct ifnet *ifp; /* incoming interface */ 529 { 530 /* 531 * check 6to4 addresses 532 */ 533 if (IN6_IS_ADDR_6TO4(in6)) 534 return stf_checkaddr4(GET_V4(in6), ifp); 535 536 /* 537 * reject anything that look suspicious. the test is implemented 538 * in ip6_input too, but we check here as well to 539 * (1) reject bad packets earlier, and 540 * (2) to be safe against future ip6_input change. 541 */ 542 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6)) 543 return -1; 544 545 return 0; 546 } 547 548 void 549 #if __STDC__ 550 in_stf_input(struct mbuf *m, ...) 551 #else 552 in_stf_input(m, va_alist) 553 register struct mbuf *m; 554 #endif 555 { 556 int off, proto; 557 struct stf_softc *sc; 558 struct ip *ip; 559 struct ip6_hdr *ip6; 560 u_int8_t otos, itos; 561 int s, isr; 562 struct ifqueue *ifq = NULL; 563 struct ifnet *ifp; 564 va_list ap; 565 566 va_start(ap, m); 567 off = va_arg(ap, int); 568 proto = va_arg(ap, int); 569 va_end(ap); 570 571 if (proto != IPPROTO_IPV6) { 572 m_freem(m); 573 return; 574 } 575 576 ip = mtod(m, struct ip *); 577 578 sc = (struct stf_softc *)encap_getarg(m); 579 580 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) { 581 m_freem(m); 582 return; 583 } 584 585 ifp = &sc->sc_if; 586 587 /* 588 * perform sanity check against outer src/dst. 589 * for source, perform ingress filter as well. 590 */ 591 if (stf_checkaddr4(&ip->ip_dst, NULL) < 0 || 592 stf_checkaddr4(&ip->ip_src, m->m_pkthdr.rcvif) < 0) { 593 m_freem(m); 594 return; 595 } 596 597 otos = ip->ip_tos; 598 m_adj(m, off); 599 600 if (m->m_len < sizeof(*ip6)) { 601 m = m_pullup(m, sizeof(*ip6)); 602 if (!m) 603 return; 604 } 605 ip6 = mtod(m, struct ip6_hdr *); 606 607 /* 608 * perform sanity check against inner src/dst. 609 * for source, perform ingress filter as well. 610 */ 611 if (stf_checkaddr6(&ip6->ip6_dst, NULL) < 0 || 612 stf_checkaddr6(&ip6->ip6_src, m->m_pkthdr.rcvif) < 0) { 613 m_freem(m); 614 return; 615 } 616 617 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 618 if ((ifp->if_flags & IFF_LINK1) != 0) 619 ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 620 ip6->ip6_flow &= ~htonl(0xff << 20); 621 ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 622 623 m->m_pkthdr.rcvif = ifp; 624 625 #if NBPFILTER > 0 626 if (ifp->if_bpf) { 627 /* 628 * We need to prepend the address family as 629 * a four byte field. Cons up a dummy header 630 * to pacify bpf. This is safe because bpf 631 * will only read from the mbuf (i.e., it won't 632 * try to free it or keep a pointer a to it). 633 */ 634 struct mbuf m0; 635 u_int af = AF_INET6; 636 637 m0.m_next = m; 638 m0.m_len = 4; 639 m0.m_data = (char *)⁡ 640 641 #ifdef HAVE_OLD_BPF 642 bpf_mtap(ifp, &m0); 643 #else 644 bpf_mtap(ifp->if_bpf, &m0); 645 #endif 646 } 647 #endif /*NBPFILTER > 0*/ 648 649 /* 650 * Put the packet to the network layer input queue according to the 651 * specified address family. 652 * See net/if_gif.c for possible issues with packet processing 653 * reorder due to extra queueing. 654 */ 655 ifq = &ip6intrq; 656 isr = NETISR_IPV6; 657 658 s = splimp(); 659 if (IF_QFULL(ifq)) { 660 IF_DROP(ifq); /* update statistics */ 661 m_freem(m); 662 splx(s); 663 return; 664 } 665 IF_ENQUEUE(ifq, m); 666 schednetisr(isr); 667 ifp->if_ipackets++; 668 ifp->if_ibytes += m->m_pkthdr.len; 669 splx(s); 670 } 671 672 /* ARGSUSED */ 673 static void 674 stf_rtrequest(cmd, rt, sa) 675 int cmd; 676 struct rtentry *rt; 677 #if defined(__bsdi__) && _BSDI_VERSION >= 199802 678 struct rt_addrinfo *sa; 679 #else 680 struct sockaddr *sa; 681 #endif 682 { 683 684 if (rt) 685 rt->rt_rmx.rmx_mtu = IPV6_MMTU; 686 } 687 688 static int 689 stf_ioctl(ifp, cmd, data) 690 struct ifnet *ifp; 691 #if defined(__FreeBSD__) && __FreeBSD__ < 3 692 int cmd; 693 #else 694 u_long cmd; 695 #endif 696 caddr_t data; 697 { 698 struct ifaddr *ifa; 699 struct ifreq *ifr; 700 struct sockaddr_in6 *sin6; 701 int error; 702 703 error = 0; 704 switch (cmd) { 705 case SIOCSIFADDR: 706 ifa = (struct ifaddr *)data; 707 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) { 708 error = EAFNOSUPPORT; 709 break; 710 } 711 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 712 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) { 713 ifa->ifa_rtrequest = stf_rtrequest; 714 ifp->if_flags |= IFF_UP; 715 } else 716 error = EINVAL; 717 break; 718 719 case SIOCADDMULTI: 720 case SIOCDELMULTI: 721 ifr = (struct ifreq *)data; 722 if (ifr && ifr->ifr_addr.sa_family == AF_INET6) 723 ; 724 else 725 error = EAFNOSUPPORT; 726 break; 727 728 default: 729 error = EINVAL; 730 break; 731 } 732 733 return error; 734 } 735 736 #endif /* NSTF > 0 */ 737
Indexes created Tue Sep 30 20:09:53 GMT 2025