if_gif.c revision 1.13
1 /* $NetBSD: if_gif.c,v 1.13 2000/07/05 16:54:19 thorpej Exp $ */ 2 /* $KAME: if_gif.c,v 1.28 2000/06/20 12:30:03 jinmei Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 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 * gif.c 35 */ 36 37 #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__) 38 #include "opt_inet.h" 39 #endif 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 45 #include <sys/malloc.h> 46 #endif 47 #include <sys/mbuf.h> 48 #include <sys/socket.h> 49 #include <sys/sockio.h> 50 #include <sys/errno.h> 51 #if defined(__FreeBSD__) || __FreeBSD__ >= 3 52 /*nothing*/ 53 #else 54 #include <sys/ioctl.h> 55 #endif 56 #include <sys/time.h> 57 #include <sys/syslog.h> 58 #include <sys/protosw.h> 59 #include <machine/cpu.h> 60 61 #include <net/if.h> 62 #include <net/if_types.h> 63 #include <net/netisr.h> 64 #include <net/route.h> 65 #include <net/bpf.h> 66 67 #ifdef INET 68 #include <netinet/in.h> 69 #include <netinet/in_systm.h> 70 #include <netinet/in_var.h> 71 #include <netinet/ip.h> 72 #include <netinet/in_gif.h> 73 #endif /* INET */ 74 75 #ifdef INET6 76 #ifndef INET 77 #include <netinet/in.h> 78 #endif 79 #include <netinet6/in6_var.h> 80 #include <netinet/ip6.h> 81 #include <netinet6/ip6_var.h> 82 #include <netinet6/in6_gif.h> 83 #include <netinet6/ip6protosw.h> 84 #endif /* INET6 */ 85 86 #include <netinet/ip_encap.h> 87 #include <net/if_gif.h> 88 89 #include "gif.h" 90 #include "bpfilter.h" 91 92 #include <net/net_osdep.h> 93 94 #if NGIF > 0 95 96 #ifdef __FreeBSD__ 97 void gifattach __P((void *)); 98 #else 99 void gifattach __P((int)); 100 #endif 101 static int gif_encapcheck __P((const struct mbuf *, int, int, void *)); 102 #ifdef INET 103 extern struct protosw in_gif_protosw; 104 #endif 105 #ifdef INET6 106 extern struct ip6protosw in6_gif_protosw; 107 #endif 108 109 /* 110 * gif global variable definitions 111 */ 112 LIST_HEAD(, gif_softc) gif_softc_list; 113 114 int gif_clone_create __P((struct if_clone *, int)); 115 void gif_clone_destroy __P((struct ifnet *)); 116 117 struct if_clone gif_cloner = 118 IF_CLONE_INITIALIZER("gif", gif_clone_create, gif_clone_destroy); 119 120 void gif_delete_tunnel __P((struct gif_softc *)); 121 122 #ifndef MAX_GIF_NEST 123 /* 124 * This macro controls the upper limitation on nesting of gif tunnels. 125 * Since, setting a large value to this macro with a careless configuration 126 * may introduce system crash, we don't allow any nestings by default. 127 * If you need to configure nested gif tunnels, you can define this macro 128 * in your kernel configuration file. However, if you do so, please be 129 * careful to configure the tunnels so that it won't make a loop. 130 */ 131 #define MAX_GIF_NEST 1 132 #endif 133 static int max_gif_nesting = MAX_GIF_NEST; 134 135 /* ARGSUSED */ 136 void 137 gifattach(count) 138 int count; 139 { 140 141 LIST_INIT(&gif_softc_list); 142 if_clone_attach(&gif_cloner); 143 } 144 145 int 146 gif_clone_create(ifc, unit) 147 struct if_clone *ifc; 148 int unit; 149 { 150 struct gif_softc *sc; 151 152 sc = malloc(sizeof(struct gif_softc), M_DEVBUF, M_WAIT); 153 bzero(sc, sizeof(struct gif_softc)); 154 155 sprintf(sc->gif_if.if_xname, "%s%d", ifc->ifc_name, unit); 156 157 sc->encap_cookie4 = sc->encap_cookie6 = NULL; 158 #ifdef INET 159 sc->encap_cookie4 = encap_attach_func(AF_INET, -1, 160 gif_encapcheck, &in_gif_protosw, sc); 161 if (sc->encap_cookie4 == NULL) { 162 printf("%s: unable to attach encap4\n", if_name(&sc->gif_if)); 163 free(sc, M_DEVBUF); 164 return (EIO); /* XXX */ 165 } 166 #endif 167 #ifdef INET6 168 sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, 169 gif_encapcheck, (struct protosw *)&in6_gif_protosw, sc); 170 if (sc->encap_cookie6 == NULL) { 171 if (sc->encap_cookie4) { 172 encap_detach(sc->encap_cookie4); 173 sc->encap_cookie4 = NULL; 174 } 175 printf("%s: unable to attach encap6\n", if_name(&sc->gif_if)); 176 free(sc, M_DEVBUF); 177 return (EIO); /* XXX */ 178 } 179 #endif 180 181 sc->gif_if.if_mtu = GIF_MTU; 182 sc->gif_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 183 sc->gif_if.if_ioctl = gif_ioctl; 184 sc->gif_if.if_output = gif_output; 185 sc->gif_if.if_type = IFT_GIF; 186 if_attach(&sc->gif_if); 187 #if NBPFILTER > 0 188 #ifdef HAVE_OLD_BPF 189 bpfattach(&sc->gif_if, DLT_NULL, sizeof(u_int)); 190 #else 191 bpfattach(&sc->gif_if.if_bpf, &sc->gif_if, DLT_NULL, sizeof(u_int)); 192 #endif 193 #endif 194 LIST_INSERT_HEAD(&gif_softc_list, sc, gif_list); 195 return (0); 196 } 197 198 void 199 gif_clone_destroy(ifp) 200 struct ifnet *ifp; 201 { 202 struct gif_softc *sc = (void *) ifp; 203 204 gif_delete_tunnel(sc); 205 LIST_REMOVE(sc, gif_list); 206 #ifdef INET6 207 encap_detach(sc->encap_cookie6); 208 #endif 209 #ifdef INET 210 encap_detach(sc->encap_cookie4); 211 #endif 212 213 #if NBPFILTER > 0 214 bpfdetach(ifp); 215 #endif 216 if_detach(ifp); 217 218 free(sc, M_DEVBUF); 219 } 220 221 #ifdef __FreeBSD__ 222 PSEUDO_SET(gifattach, if_gif); 223 #endif 224 225 static int 226 gif_encapcheck(m, off, proto, arg) 227 const struct mbuf *m; 228 int off; 229 int proto; 230 void *arg; 231 { 232 struct ip ip; 233 struct gif_softc *sc; 234 235 sc = (struct gif_softc *)arg; 236 if (sc == NULL) 237 return 0; 238 239 if ((sc->gif_if.if_flags & IFF_UP) == 0) 240 return 0; 241 242 /* no physical address */ 243 if (!sc->gif_psrc || !sc->gif_pdst) 244 return 0; 245 246 switch (proto) { 247 #ifdef INET 248 case IPPROTO_IPV4: 249 break; 250 #endif 251 #ifdef INET6 252 case IPPROTO_IPV6: 253 break; 254 #endif 255 default: 256 return 0; 257 } 258 259 /* LINTED const cast */ 260 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); 261 262 switch (ip.ip_v) { 263 #ifdef INET 264 case 4: 265 if (sc->gif_psrc->sa_family != AF_INET || 266 sc->gif_pdst->sa_family != AF_INET) 267 return 0; 268 return gif_encapcheck4(m, off, proto, arg); 269 #endif 270 #ifdef INET6 271 case 6: 272 if (sc->gif_psrc->sa_family != AF_INET6 || 273 sc->gif_pdst->sa_family != AF_INET6) 274 return 0; 275 return gif_encapcheck6(m, off, proto, arg); 276 #endif 277 default: 278 return 0; 279 } 280 } 281 282 int 283 gif_output(ifp, m, dst, rt) 284 struct ifnet *ifp; 285 struct mbuf *m; 286 struct sockaddr *dst; 287 struct rtentry *rt; /* added in net2 */ 288 { 289 register struct gif_softc *sc = (struct gif_softc*)ifp; 290 int error = 0; 291 static int called = 0; /* XXX: MUTEX */ 292 293 /* 294 * gif may cause infinite recursion calls when misconfigured. 295 * We'll prevent this by introducing upper limit. 296 * XXX: this mechanism may introduce another problem about 297 * mutual exclusion of the variable CALLED, especially if we 298 * use kernel thread. 299 */ 300 if (++called > max_gif_nesting) { 301 log(LOG_NOTICE, 302 "gif_output: recursively called too many times(%d)\n", 303 called); 304 m_freem(m); 305 error = EIO; /* is there better errno? */ 306 goto end; 307 } 308 309 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 310 getmicrotime(&ifp->if_lastchange); 311 #else 312 ifp->if_lastchange = time; 313 #endif 314 m->m_flags &= ~(M_BCAST|M_MCAST); 315 if (!(ifp->if_flags & IFF_UP) || 316 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 317 m_freem(m); 318 error = ENETDOWN; 319 goto end; 320 } 321 322 #if NBPFILTER > 0 323 if (ifp->if_bpf) { 324 /* 325 * We need to prepend the address family as 326 * a four byte field. Cons up a dummy header 327 * to pacify bpf. This is safe because bpf 328 * will only read from the mbuf (i.e., it won't 329 * try to free it or keep a pointer a to it). 330 */ 331 struct mbuf m0; 332 u_int af = dst->sa_family; 333 334 m0.m_next = m; 335 m0.m_len = 4; 336 m0.m_data = (char *)⁡ 337 338 #ifdef HAVE_OLD_BPF 339 bpf_mtap(ifp, &m0); 340 #else 341 bpf_mtap(ifp->if_bpf, &m0); 342 #endif 343 } 344 #endif 345 ifp->if_opackets++; 346 ifp->if_obytes += m->m_pkthdr.len; 347 348 /* XXX should we check if our outer source is legal? */ 349 350 switch (sc->gif_psrc->sa_family) { 351 #ifdef INET 352 case AF_INET: 353 error = in_gif_output(ifp, dst->sa_family, m, rt); 354 break; 355 #endif 356 #ifdef INET6 357 case AF_INET6: 358 error = in6_gif_output(ifp, dst->sa_family, m, rt); 359 break; 360 #endif 361 default: 362 m_freem(m); 363 error = ENETDOWN; 364 } 365 366 end: 367 called = 0; /* reset recursion counter */ 368 if (error) ifp->if_oerrors++; 369 return error; 370 } 371 372 void 373 gif_input(m, af, gifp) 374 struct mbuf *m; 375 int af; 376 struct ifnet *gifp; 377 { 378 int s, isr; 379 register struct ifqueue *ifq = 0; 380 381 if (gifp == NULL) { 382 /* just in case */ 383 m_freem(m); 384 return; 385 } 386 387 m->m_pkthdr.rcvif = gifp; 388 389 #if NBPFILTER > 0 390 if (gifp->if_bpf) { 391 /* 392 * We need to prepend the address family as 393 * a four byte field. Cons up a dummy header 394 * to pacify bpf. This is safe because bpf 395 * will only read from the mbuf (i.e., it won't 396 * try to free it or keep a pointer a to it). 397 */ 398 struct mbuf m0; 399 u_int af = AF_INET6; 400 401 m0.m_next = m; 402 m0.m_len = 4; 403 m0.m_data = (char *)⁡ 404 405 #ifdef HAVE_OLD_BPF 406 bpf_mtap(gifp, &m0); 407 #else 408 bpf_mtap(gifp->if_bpf, &m0); 409 #endif 410 } 411 #endif /*NBPFILTER > 0*/ 412 413 /* 414 * Put the packet to the network layer input queue according to the 415 * specified address family. 416 * Note: older versions of gif_input directly called network layer 417 * input functions, e.g. ip6_input, here. We changed the policy to 418 * prevent too many recursive calls of such input functions, which 419 * might cause kernel panic. But the change may introduce another 420 * problem; if the input queue is full, packets are discarded. 421 * We believed it rarely occurs and changed the policy. If we find 422 * it occurs more times than we thought, we may change the policy 423 * again. 424 */ 425 switch (af) { 426 #ifdef INET 427 case AF_INET: 428 ifq = &ipintrq; 429 isr = NETISR_IP; 430 break; 431 #endif 432 #ifdef INET6 433 case AF_INET6: 434 ifq = &ip6intrq; 435 isr = NETISR_IPV6; 436 break; 437 #endif 438 default: 439 m_freem(m); 440 return; 441 } 442 443 s = splimp(); 444 if (IF_QFULL(ifq)) { 445 IF_DROP(ifq); /* update statistics */ 446 m_freem(m); 447 splx(s); 448 return; 449 } 450 IF_ENQUEUE(ifq, m); 451 /* we need schednetisr since the address family may change */ 452 schednetisr(isr); 453 gifp->if_ipackets++; 454 gifp->if_ibytes += m->m_pkthdr.len; 455 splx(s); 456 457 return; 458 } 459 460 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 461 int 462 gif_ioctl(ifp, cmd, data) 463 struct ifnet *ifp; 464 #if defined(__FreeBSD__) && __FreeBSD__ < 3 465 int cmd; 466 #else 467 u_long cmd; 468 #endif 469 caddr_t data; 470 { 471 struct gif_softc *sc = (struct gif_softc*)ifp; 472 struct ifreq *ifr = (struct ifreq*)data; 473 int error = 0, size; 474 struct sockaddr *dst, *src; 475 struct sockaddr *sa; 476 struct gif_softc *sc2; 477 478 switch (cmd) { 479 case SIOCSIFADDR: 480 break; 481 482 case SIOCSIFDSTADDR: 483 break; 484 485 case SIOCADDMULTI: 486 case SIOCDELMULTI: 487 #if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) 488 switch (ifr->ifr_addr.sa_family) { 489 #ifdef INET 490 case AF_INET: /* IP supports Multicast */ 491 break; 492 #endif /* INET */ 493 #ifdef INET6 494 case AF_INET6: /* IP6 supports Multicast */ 495 break; 496 #endif /* INET6 */ 497 default: /* Other protocols doesn't support Multicast */ 498 error = EAFNOSUPPORT; 499 break; 500 } 501 #endif /*not FreeBSD3*/ 502 break; 503 504 #ifdef SIOCSIFMTU /* xxx */ 505 case SIOCGIFMTU: 506 break; 507 508 case SIOCSIFMTU: 509 { 510 #ifdef __bsdi__ 511 short mtu; 512 mtu = *(short *)ifr->ifr_data; 513 #else 514 u_long mtu; 515 mtu = ifr->ifr_mtu; 516 #endif 517 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) { 518 return (EINVAL); 519 } 520 ifp->if_mtu = mtu; 521 } 522 break; 523 #endif /* SIOCSIFMTU */ 524 525 case SIOCSIFPHYADDR: 526 #ifdef INET6 527 case SIOCSIFPHYADDR_IN6: 528 #endif /* INET6 */ 529 switch (cmd) { 530 case SIOCSIFPHYADDR: 531 src = (struct sockaddr *) 532 &(((struct in_aliasreq *)data)->ifra_addr); 533 dst = (struct sockaddr *) 534 &(((struct in_aliasreq *)data)->ifra_dstaddr); 535 break; 536 #ifdef INET6 537 case SIOCSIFPHYADDR_IN6: 538 src = (struct sockaddr *) 539 &(((struct in6_aliasreq *)data)->ifra_addr); 540 dst = (struct sockaddr *) 541 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 542 break; 543 #endif 544 } 545 546 for (sc2 = LIST_FIRST(&gif_softc_list); sc2 != NULL; 547 sc2 = LIST_NEXT(sc2, gif_list)) { 548 if (sc2 == sc) 549 continue; 550 if (!sc2->gif_pdst || !sc2->gif_psrc) 551 continue; 552 if (sc2->gif_pdst->sa_family != dst->sa_family || 553 sc2->gif_pdst->sa_len != dst->sa_len || 554 sc2->gif_psrc->sa_family != src->sa_family || 555 sc2->gif_psrc->sa_len != src->sa_len) 556 continue; 557 558 /* can't configure same pair of address onto two gifs */ 559 if (bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 560 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 561 error = EADDRNOTAVAIL; 562 goto bad; 563 } 564 565 /* can't configure multiple multi-dest interfaces */ 566 #define multidest(x) \ 567 (((struct sockaddr_in *)(x))->sin_addr.s_addr == INADDR_ANY) 568 #ifdef INET6 569 #define multidest6(x) \ 570 (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)(x))->sin6_addr)) 571 #endif 572 if (dst->sa_family == AF_INET && 573 multidest(dst) && multidest(sc2->gif_pdst)) { 574 error = EADDRNOTAVAIL; 575 goto bad; 576 } 577 #ifdef INET6 578 if (dst->sa_family == AF_INET6 && 579 multidest6(dst) && multidest6(sc2->gif_pdst)) { 580 error = EADDRNOTAVAIL; 581 goto bad; 582 } 583 #endif 584 } 585 586 if (src->sa_family != dst->sa_family || 587 src->sa_len != dst->sa_len) { 588 error = EINVAL; 589 break; 590 } 591 switch (src->sa_family) { 592 #ifdef INET 593 case AF_INET: 594 size = sizeof(struct sockaddr_in); 595 break; 596 #endif 597 #ifdef INET6 598 case AF_INET6: 599 size = sizeof(struct sockaddr_in6); 600 break; 601 #endif 602 default: 603 error = EAFNOSUPPORT; 604 goto bad; 605 } 606 if (src->sa_len != size) { 607 error = EINVAL; 608 break; 609 } 610 611 if (sc->gif_psrc) 612 free((caddr_t)sc->gif_psrc, M_IFADDR); 613 sa = (struct sockaddr *)malloc(size, M_IFADDR, M_WAITOK); 614 bcopy((caddr_t)src, (caddr_t)sa, size); 615 sc->gif_psrc = sa; 616 617 if (sc->gif_pdst) 618 free((caddr_t)sc->gif_pdst, M_IFADDR); 619 sa = (struct sockaddr *)malloc(size, M_IFADDR, M_WAITOK); 620 bcopy((caddr_t)dst, (caddr_t)sa, size); 621 sc->gif_pdst = sa; 622 623 ifp->if_flags |= IFF_UP; 624 if_up(ifp); /* send up RTM_IFINFO */ 625 626 error = 0; 627 break; 628 629 #ifdef SIOCDIFPHYADDR 630 case SIOCDIFPHYADDR: 631 gif_delete_tunnel(sc); 632 break; 633 #endif 634 635 case SIOCGIFPSRCADDR: 636 #ifdef INET6 637 case SIOCGIFPSRCADDR_IN6: 638 #endif /* INET6 */ 639 if (sc->gif_psrc == NULL) { 640 error = EADDRNOTAVAIL; 641 goto bad; 642 } 643 src = sc->gif_psrc; 644 switch (sc->gif_psrc->sa_family) { 645 #ifdef INET 646 case AF_INET: 647 dst = &ifr->ifr_addr; 648 size = sizeof(struct sockaddr_in); 649 break; 650 #endif /* INET */ 651 #ifdef INET6 652 case AF_INET6: 653 dst = (struct sockaddr *) 654 &(((struct in6_ifreq *)data)->ifr_addr); 655 size = sizeof(struct sockaddr_in6); 656 break; 657 #endif /* INET6 */ 658 default: 659 error = EADDRNOTAVAIL; 660 goto bad; 661 } 662 bcopy((caddr_t)src, (caddr_t)dst, size); 663 break; 664 665 case SIOCGIFPDSTADDR: 666 #ifdef INET6 667 case SIOCGIFPDSTADDR_IN6: 668 #endif /* INET6 */ 669 if (sc->gif_pdst == NULL) { 670 error = EADDRNOTAVAIL; 671 goto bad; 672 } 673 src = sc->gif_pdst; 674 switch (sc->gif_pdst->sa_family) { 675 #ifdef INET 676 case AF_INET: 677 dst = &ifr->ifr_addr; 678 size = sizeof(struct sockaddr_in); 679 break; 680 #endif /* INET */ 681 #ifdef INET6 682 case AF_INET6: 683 dst = (struct sockaddr *) 684 &(((struct in6_ifreq *)data)->ifr_addr); 685 size = sizeof(struct sockaddr_in6); 686 break; 687 #endif /* INET6 */ 688 default: 689 error = EADDRNOTAVAIL; 690 goto bad; 691 } 692 bcopy((caddr_t)src, (caddr_t)dst, size); 693 break; 694 695 case SIOCSIFFLAGS: 696 /* if_ioctl() takes care of it */ 697 break; 698 699 default: 700 error = EINVAL; 701 break; 702 } 703 bad: 704 return error; 705 } 706 707 void 708 gif_delete_tunnel(sc) 709 struct gif_softc *sc; 710 { 711 int s; 712 713 s = splsoftnet(); 714 715 if (sc->gif_psrc) { 716 free((caddr_t)sc->gif_psrc, M_IFADDR); 717 sc->gif_psrc = NULL; 718 } 719 if (sc->gif_pdst) { 720 free((caddr_t)sc->gif_pdst, M_IFADDR); 721 sc->gif_pdst = NULL; 722 } 723 /* change the IFF_UP flag as well? */ 724 725 splx(s); 726 } 727 #endif /*NGIF > 0*/ 728
Indexes created Wed Sep 24 15:09:51 GMT 2025