if_gif.c revision 1.12
1 /* $NetBSD: if_gif.c,v 1.12 2000/07/02 00:21:42 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 return (EIO); /* XXX */ 164 } 165 #endif 166 #ifdef INET6 167 sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, 168 gif_encapcheck, (struct protosw *)&in6_gif_protosw, sc); 169 if (sc->encap_cookie6 == NULL) { 170 if (sc->encap_cookie4) { 171 encap_detach(sc->encap_cookie4); 172 sc->encap_cookie4 = NULL; 173 } 174 printf("%s: unable to attach encap6\n", if_name(&sc->gif_if)); 175 return (EIO); /* XXX */ 176 } 177 #endif 178 179 sc->gif_if.if_mtu = GIF_MTU; 180 sc->gif_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 181 sc->gif_if.if_ioctl = gif_ioctl; 182 sc->gif_if.if_output = gif_output; 183 sc->gif_if.if_type = IFT_GIF; 184 if_attach(&sc->gif_if); 185 #if NBPFILTER > 0 186 #ifdef HAVE_OLD_BPF 187 bpfattach(&sc->gif_if, DLT_NULL, sizeof(u_int)); 188 #else 189 bpfattach(&sc->gif_if.if_bpf, &sc->gif_if, DLT_NULL, sizeof(u_int)); 190 #endif 191 #endif 192 LIST_INSERT_HEAD(&gif_softc_list, sc, gif_list); 193 return (0); 194 } 195 196 void 197 gif_clone_destroy(ifp) 198 struct ifnet *ifp; 199 { 200 struct gif_softc *sc = (void *) ifp; 201 202 gif_delete_tunnel(sc); 203 LIST_REMOVE(sc, gif_list); 204 #ifdef INET6 205 encap_detach(sc->encap_cookie6); 206 #endif 207 #ifdef INET 208 encap_detach(sc->encap_cookie4); 209 #endif 210 211 #if NBPFILTER > 0 212 bpfdetach(ifp); 213 #endif 214 if_detach(ifp); 215 216 free(sc, M_DEVBUF); 217 } 218 219 #ifdef __FreeBSD__ 220 PSEUDO_SET(gifattach, if_gif); 221 #endif 222 223 static int 224 gif_encapcheck(m, off, proto, arg) 225 const struct mbuf *m; 226 int off; 227 int proto; 228 void *arg; 229 { 230 struct ip ip; 231 struct gif_softc *sc; 232 233 sc = (struct gif_softc *)arg; 234 if (sc == NULL) 235 return 0; 236 237 if ((sc->gif_if.if_flags & IFF_UP) == 0) 238 return 0; 239 240 /* no physical address */ 241 if (!sc->gif_psrc || !sc->gif_pdst) 242 return 0; 243 244 switch (proto) { 245 #ifdef INET 246 case IPPROTO_IPV4: 247 break; 248 #endif 249 #ifdef INET6 250 case IPPROTO_IPV6: 251 break; 252 #endif 253 default: 254 return 0; 255 } 256 257 /* LINTED const cast */ 258 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); 259 260 switch (ip.ip_v) { 261 #ifdef INET 262 case 4: 263 if (sc->gif_psrc->sa_family != AF_INET || 264 sc->gif_pdst->sa_family != AF_INET) 265 return 0; 266 return gif_encapcheck4(m, off, proto, arg); 267 #endif 268 #ifdef INET6 269 case 6: 270 if (sc->gif_psrc->sa_family != AF_INET6 || 271 sc->gif_pdst->sa_family != AF_INET6) 272 return 0; 273 return gif_encapcheck6(m, off, proto, arg); 274 #endif 275 default: 276 return 0; 277 } 278 } 279 280 int 281 gif_output(ifp, m, dst, rt) 282 struct ifnet *ifp; 283 struct mbuf *m; 284 struct sockaddr *dst; 285 struct rtentry *rt; /* added in net2 */ 286 { 287 register struct gif_softc *sc = (struct gif_softc*)ifp; 288 int error = 0; 289 static int called = 0; /* XXX: MUTEX */ 290 291 /* 292 * gif may cause infinite recursion calls when misconfigured. 293 * We'll prevent this by introducing upper limit. 294 * XXX: this mechanism may introduce another problem about 295 * mutual exclusion of the variable CALLED, especially if we 296 * use kernel thread. 297 */ 298 if (++called > max_gif_nesting) { 299 log(LOG_NOTICE, 300 "gif_output: recursively called too many times(%d)\n", 301 called); 302 m_freem(m); 303 error = EIO; /* is there better errno? */ 304 goto end; 305 } 306 307 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 308 getmicrotime(&ifp->if_lastchange); 309 #else 310 ifp->if_lastchange = time; 311 #endif 312 m->m_flags &= ~(M_BCAST|M_MCAST); 313 if (!(ifp->if_flags & IFF_UP) || 314 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 315 m_freem(m); 316 error = ENETDOWN; 317 goto end; 318 } 319 320 #if NBPFILTER > 0 321 if (ifp->if_bpf) { 322 /* 323 * We need to prepend the address family as 324 * a four byte field. Cons up a dummy header 325 * to pacify bpf. This is safe because bpf 326 * will only read from the mbuf (i.e., it won't 327 * try to free it or keep a pointer a to it). 328 */ 329 struct mbuf m0; 330 u_int af = dst->sa_family; 331 332 m0.m_next = m; 333 m0.m_len = 4; 334 m0.m_data = (char *)⁡ 335 336 #ifdef HAVE_OLD_BPF 337 bpf_mtap(ifp, &m0); 338 #else 339 bpf_mtap(ifp->if_bpf, &m0); 340 #endif 341 } 342 #endif 343 ifp->if_opackets++; 344 ifp->if_obytes += m->m_pkthdr.len; 345 346 /* XXX should we check if our outer source is legal? */ 347 348 switch (sc->gif_psrc->sa_family) { 349 #ifdef INET 350 case AF_INET: 351 error = in_gif_output(ifp, dst->sa_family, m, rt); 352 break; 353 #endif 354 #ifdef INET6 355 case AF_INET6: 356 error = in6_gif_output(ifp, dst->sa_family, m, rt); 357 break; 358 #endif 359 default: 360 m_freem(m); 361 error = ENETDOWN; 362 } 363 364 end: 365 called = 0; /* reset recursion counter */ 366 if (error) ifp->if_oerrors++; 367 return error; 368 } 369 370 void 371 gif_input(m, af, gifp) 372 struct mbuf *m; 373 int af; 374 struct ifnet *gifp; 375 { 376 int s, isr; 377 register struct ifqueue *ifq = 0; 378 379 if (gifp == NULL) { 380 /* just in case */ 381 m_freem(m); 382 return; 383 } 384 385 m->m_pkthdr.rcvif = gifp; 386 387 #if NBPFILTER > 0 388 if (gifp->if_bpf) { 389 /* 390 * We need to prepend the address family as 391 * a four byte field. Cons up a dummy header 392 * to pacify bpf. This is safe because bpf 393 * will only read from the mbuf (i.e., it won't 394 * try to free it or keep a pointer a to it). 395 */ 396 struct mbuf m0; 397 u_int af = AF_INET6; 398 399 m0.m_next = m; 400 m0.m_len = 4; 401 m0.m_data = (char *)⁡ 402 403 #ifdef HAVE_OLD_BPF 404 bpf_mtap(gifp, &m0); 405 #else 406 bpf_mtap(gifp->if_bpf, &m0); 407 #endif 408 } 409 #endif /*NBPFILTER > 0*/ 410 411 /* 412 * Put the packet to the network layer input queue according to the 413 * specified address family. 414 * Note: older versions of gif_input directly called network layer 415 * input functions, e.g. ip6_input, here. We changed the policy to 416 * prevent too many recursive calls of such input functions, which 417 * might cause kernel panic. But the change may introduce another 418 * problem; if the input queue is full, packets are discarded. 419 * We believed it rarely occurs and changed the policy. If we find 420 * it occurs more times than we thought, we may change the policy 421 * again. 422 */ 423 switch (af) { 424 #ifdef INET 425 case AF_INET: 426 ifq = &ipintrq; 427 isr = NETISR_IP; 428 break; 429 #endif 430 #ifdef INET6 431 case AF_INET6: 432 ifq = &ip6intrq; 433 isr = NETISR_IPV6; 434 break; 435 #endif 436 default: 437 m_freem(m); 438 return; 439 } 440 441 s = splimp(); 442 if (IF_QFULL(ifq)) { 443 IF_DROP(ifq); /* update statistics */ 444 m_freem(m); 445 splx(s); 446 return; 447 } 448 IF_ENQUEUE(ifq, m); 449 /* we need schednetisr since the address family may change */ 450 schednetisr(isr); 451 gifp->if_ipackets++; 452 gifp->if_ibytes += m->m_pkthdr.len; 453 splx(s); 454 455 return; 456 } 457 458 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 459 int 460 gif_ioctl(ifp, cmd, data) 461 struct ifnet *ifp; 462 #if defined(__FreeBSD__) && __FreeBSD__ < 3 463 int cmd; 464 #else 465 u_long cmd; 466 #endif 467 caddr_t data; 468 { 469 struct gif_softc *sc = (struct gif_softc*)ifp; 470 struct ifreq *ifr = (struct ifreq*)data; 471 int error = 0, size; 472 struct sockaddr *dst, *src; 473 struct sockaddr *sa; 474 struct gif_softc *sc2; 475 476 switch (cmd) { 477 case SIOCSIFADDR: 478 break; 479 480 case SIOCSIFDSTADDR: 481 break; 482 483 case SIOCADDMULTI: 484 case SIOCDELMULTI: 485 #if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) 486 switch (ifr->ifr_addr.sa_family) { 487 #ifdef INET 488 case AF_INET: /* IP supports Multicast */ 489 break; 490 #endif /* INET */ 491 #ifdef INET6 492 case AF_INET6: /* IP6 supports Multicast */ 493 break; 494 #endif /* INET6 */ 495 default: /* Other protocols doesn't support Multicast */ 496 error = EAFNOSUPPORT; 497 break; 498 } 499 #endif /*not FreeBSD3*/ 500 break; 501 502 #ifdef SIOCSIFMTU /* xxx */ 503 case SIOCGIFMTU: 504 break; 505 506 case SIOCSIFMTU: 507 { 508 #ifdef __bsdi__ 509 short mtu; 510 mtu = *(short *)ifr->ifr_data; 511 #else 512 u_long mtu; 513 mtu = ifr->ifr_mtu; 514 #endif 515 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) { 516 return (EINVAL); 517 } 518 ifp->if_mtu = mtu; 519 } 520 break; 521 #endif /* SIOCSIFMTU */ 522 523 case SIOCSIFPHYADDR: 524 #ifdef INET6 525 case SIOCSIFPHYADDR_IN6: 526 #endif /* INET6 */ 527 switch (cmd) { 528 case SIOCSIFPHYADDR: 529 src = (struct sockaddr *) 530 &(((struct in_aliasreq *)data)->ifra_addr); 531 dst = (struct sockaddr *) 532 &(((struct in_aliasreq *)data)->ifra_dstaddr); 533 break; 534 #ifdef INET6 535 case SIOCSIFPHYADDR_IN6: 536 src = (struct sockaddr *) 537 &(((struct in6_aliasreq *)data)->ifra_addr); 538 dst = (struct sockaddr *) 539 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 540 break; 541 #endif 542 } 543 544 for (sc2 = LIST_FIRST(&gif_softc_list); sc2 != NULL; 545 sc2 = LIST_NEXT(sc2, gif_list)) { 546 if (sc2 == sc) 547 continue; 548 if (!sc2->gif_pdst || !sc2->gif_psrc) 549 continue; 550 if (sc2->gif_pdst->sa_family != dst->sa_family || 551 sc2->gif_pdst->sa_len != dst->sa_len || 552 sc2->gif_psrc->sa_family != src->sa_family || 553 sc2->gif_psrc->sa_len != src->sa_len) 554 continue; 555 556 /* can't configure same pair of address onto two gifs */ 557 if (bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 558 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 559 error = EADDRNOTAVAIL; 560 goto bad; 561 } 562 563 /* can't configure multiple multi-dest interfaces */ 564 #define multidest(x) \ 565 (((struct sockaddr_in *)(x))->sin_addr.s_addr == INADDR_ANY) 566 #ifdef INET6 567 #define multidest6(x) \ 568 (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)(x))->sin6_addr)) 569 #endif 570 if (dst->sa_family == AF_INET && 571 multidest(dst) && multidest(sc2->gif_pdst)) { 572 error = EADDRNOTAVAIL; 573 goto bad; 574 } 575 #ifdef INET6 576 if (dst->sa_family == AF_INET6 && 577 multidest6(dst) && multidest6(sc2->gif_pdst)) { 578 error = EADDRNOTAVAIL; 579 goto bad; 580 } 581 #endif 582 } 583 584 if (src->sa_family != dst->sa_family || 585 src->sa_len != dst->sa_len) { 586 error = EINVAL; 587 break; 588 } 589 switch (src->sa_family) { 590 #ifdef INET 591 case AF_INET: 592 size = sizeof(struct sockaddr_in); 593 break; 594 #endif 595 #ifdef INET6 596 case AF_INET6: 597 size = sizeof(struct sockaddr_in6); 598 break; 599 #endif 600 default: 601 error = EAFNOSUPPORT; 602 goto bad; 603 } 604 if (src->sa_len != size) { 605 error = EINVAL; 606 break; 607 } 608 609 if (sc->gif_psrc) 610 free((caddr_t)sc->gif_psrc, M_IFADDR); 611 sa = (struct sockaddr *)malloc(size, M_IFADDR, M_WAITOK); 612 bcopy((caddr_t)src, (caddr_t)sa, size); 613 sc->gif_psrc = sa; 614 615 if (sc->gif_pdst) 616 free((caddr_t)sc->gif_pdst, M_IFADDR); 617 sa = (struct sockaddr *)malloc(size, M_IFADDR, M_WAITOK); 618 bcopy((caddr_t)dst, (caddr_t)sa, size); 619 sc->gif_pdst = sa; 620 621 ifp->if_flags |= IFF_UP; 622 if_up(ifp); /* send up RTM_IFINFO */ 623 624 error = 0; 625 break; 626 627 #ifdef SIOCDIFPHYADDR 628 case SIOCDIFPHYADDR: 629 gif_delete_tunnel(sc); 630 break; 631 #endif 632 633 case SIOCGIFPSRCADDR: 634 #ifdef INET6 635 case SIOCGIFPSRCADDR_IN6: 636 #endif /* INET6 */ 637 if (sc->gif_psrc == NULL) { 638 error = EADDRNOTAVAIL; 639 goto bad; 640 } 641 src = sc->gif_psrc; 642 switch (sc->gif_psrc->sa_family) { 643 #ifdef INET 644 case AF_INET: 645 dst = &ifr->ifr_addr; 646 size = sizeof(struct sockaddr_in); 647 break; 648 #endif /* INET */ 649 #ifdef INET6 650 case AF_INET6: 651 dst = (struct sockaddr *) 652 &(((struct in6_ifreq *)data)->ifr_addr); 653 size = sizeof(struct sockaddr_in6); 654 break; 655 #endif /* INET6 */ 656 default: 657 error = EADDRNOTAVAIL; 658 goto bad; 659 } 660 bcopy((caddr_t)src, (caddr_t)dst, size); 661 break; 662 663 case SIOCGIFPDSTADDR: 664 #ifdef INET6 665 case SIOCGIFPDSTADDR_IN6: 666 #endif /* INET6 */ 667 if (sc->gif_pdst == NULL) { 668 error = EADDRNOTAVAIL; 669 goto bad; 670 } 671 src = sc->gif_pdst; 672 switch (sc->gif_pdst->sa_family) { 673 #ifdef INET 674 case AF_INET: 675 dst = &ifr->ifr_addr; 676 size = sizeof(struct sockaddr_in); 677 break; 678 #endif /* INET */ 679 #ifdef INET6 680 case AF_INET6: 681 dst = (struct sockaddr *) 682 &(((struct in6_ifreq *)data)->ifr_addr); 683 size = sizeof(struct sockaddr_in6); 684 break; 685 #endif /* INET6 */ 686 default: 687 error = EADDRNOTAVAIL; 688 goto bad; 689 } 690 bcopy((caddr_t)src, (caddr_t)dst, size); 691 break; 692 693 case SIOCSIFFLAGS: 694 /* if_ioctl() takes care of it */ 695 break; 696 697 default: 698 error = EINVAL; 699 break; 700 } 701 bad: 702 return error; 703 } 704 705 void 706 gif_delete_tunnel(sc) 707 struct gif_softc *sc; 708 { 709 int s; 710 711 s = splsoftnet(); 712 713 if (sc->gif_psrc) { 714 free((caddr_t)sc->gif_psrc, M_IFADDR); 715 sc->gif_psrc = NULL; 716 } 717 if (sc->gif_pdst) { 718 free((caddr_t)sc->gif_pdst, M_IFADDR); 719 sc->gif_pdst = NULL; 720 } 721 /* change the IFF_UP flag as well? */ 722 723 splx(s); 724 } 725 #endif /*NGIF > 0*/ 726
Indexes created Thu Sep 25 16:09:42 GMT 2025