if_gif.c revision 1.19
1 /* $NetBSD: if_gif.c,v 1.19 2000/12/18 19:50:44 thorpej Exp $ */ 2 /* $KAME: if_gif.c,v 1.34 2000/10/07 03:58:53 itojun 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 #include "opt_inet.h" 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/mbuf.h> 39 #include <sys/socket.h> 40 #include <sys/sockio.h> 41 #include <sys/errno.h> 42 #include <sys/ioctl.h> 43 #include <sys/time.h> 44 #include <sys/syslog.h> 45 #include <sys/proc.h> 46 #include <sys/protosw.h> 47 #include <machine/cpu.h> 48 49 #include <net/if.h> 50 #include <net/if_types.h> 51 #include <net/netisr.h> 52 #include <net/route.h> 53 #include <net/bpf.h> 54 55 #include <netinet/in.h> 56 #include <netinet/in_systm.h> 57 #include <netinet/ip.h> 58 #ifdef INET 59 #include <netinet/in_var.h> 60 #include <netinet/in_gif.h> 61 #endif /* INET */ 62 63 #ifdef INET6 64 #ifndef INET 65 #include <netinet/in.h> 66 #endif 67 #include <netinet6/in6_var.h> 68 #include <netinet/ip6.h> 69 #include <netinet6/ip6_var.h> 70 #include <netinet6/in6_gif.h> 71 #include <netinet6/ip6protosw.h> 72 #endif /* INET6 */ 73 74 #include <netinet/ip_encap.h> 75 #include <net/if_gif.h> 76 77 #include "gif.h" 78 #include "bpfilter.h" 79 80 #include <net/net_osdep.h> 81 82 #if NGIF > 0 83 84 void gifattach __P((int)); 85 static int gif_encapcheck __P((const struct mbuf *, int, int, void *)); 86 #ifdef INET 87 extern struct protosw in_gif_protosw; 88 #endif 89 #ifdef INET6 90 extern struct ip6protosw in6_gif_protosw; 91 #endif 92 93 /* 94 * gif global variable definitions 95 */ 96 LIST_HEAD(, gif_softc) gif_softc_list; 97 98 int gif_clone_create __P((struct if_clone *, int)); 99 void gif_clone_destroy __P((struct ifnet *)); 100 101 struct if_clone gif_cloner = 102 IF_CLONE_INITIALIZER("gif", gif_clone_create, gif_clone_destroy); 103 104 void gif_delete_tunnel __P((struct gif_softc *)); 105 106 #ifndef MAX_GIF_NEST 107 /* 108 * This macro controls the upper limitation on nesting of gif tunnels. 109 * Since, setting a large value to this macro with a careless configuration 110 * may introduce system crash, we don't allow any nestings by default. 111 * If you need to configure nested gif tunnels, you can define this macro 112 * in your kernel configuration file. However, if you do so, please be 113 * careful to configure the tunnels so that it won't make a loop. 114 */ 115 #define MAX_GIF_NEST 1 116 #endif 117 static int max_gif_nesting = MAX_GIF_NEST; 118 119 /* ARGSUSED */ 120 void 121 gifattach(count) 122 int count; 123 { 124 125 LIST_INIT(&gif_softc_list); 126 if_clone_attach(&gif_cloner); 127 } 128 129 int 130 gif_clone_create(ifc, unit) 131 struct if_clone *ifc; 132 int unit; 133 { 134 struct gif_softc *sc; 135 136 sc = malloc(sizeof(struct gif_softc), M_DEVBUF, M_WAIT); 137 bzero(sc, sizeof(struct gif_softc)); 138 139 sprintf(sc->gif_if.if_xname, "%s%d", ifc->ifc_name, unit); 140 141 sc->encap_cookie4 = sc->encap_cookie6 = NULL; 142 #ifdef INET 143 sc->encap_cookie4 = encap_attach_func(AF_INET, -1, 144 gif_encapcheck, &in_gif_protosw, sc); 145 if (sc->encap_cookie4 == NULL) { 146 printf("%s: unable to attach encap4\n", if_name(&sc->gif_if)); 147 free(sc, M_DEVBUF); 148 return (EIO); /* XXX */ 149 } 150 #endif 151 #ifdef INET6 152 sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, 153 gif_encapcheck, (struct protosw *)&in6_gif_protosw, sc); 154 if (sc->encap_cookie6 == NULL) { 155 if (sc->encap_cookie4) { 156 encap_detach(sc->encap_cookie4); 157 sc->encap_cookie4 = NULL; 158 } 159 printf("%s: unable to attach encap6\n", if_name(&sc->gif_if)); 160 free(sc, M_DEVBUF); 161 return (EIO); /* XXX */ 162 } 163 #endif 164 165 sc->gif_if.if_mtu = GIF_MTU; 166 sc->gif_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 167 sc->gif_if.if_ioctl = gif_ioctl; 168 sc->gif_if.if_output = gif_output; 169 sc->gif_if.if_type = IFT_GIF; 170 sc->gif_if.if_dlt = DLT_NULL; 171 if_attach(&sc->gif_if); 172 #if NBPFILTER > 0 173 bpfattach(&sc->gif_if, DLT_NULL, sizeof(u_int)); 174 #endif 175 LIST_INSERT_HEAD(&gif_softc_list, sc, gif_list); 176 return (0); 177 } 178 179 void 180 gif_clone_destroy(ifp) 181 struct ifnet *ifp; 182 { 183 struct gif_softc *sc = (void *) ifp; 184 185 gif_delete_tunnel(sc); 186 LIST_REMOVE(sc, gif_list); 187 #ifdef INET6 188 encap_detach(sc->encap_cookie6); 189 #endif 190 #ifdef INET 191 encap_detach(sc->encap_cookie4); 192 #endif 193 194 #if NBPFILTER > 0 195 bpfdetach(ifp); 196 #endif 197 if_detach(ifp); 198 199 free(sc, M_DEVBUF); 200 } 201 202 static int 203 gif_encapcheck(m, off, proto, arg) 204 const struct mbuf *m; 205 int off; 206 int proto; 207 void *arg; 208 { 209 struct ip ip; 210 struct gif_softc *sc; 211 212 sc = (struct gif_softc *)arg; 213 if (sc == NULL) 214 return 0; 215 216 if ((sc->gif_if.if_flags & IFF_UP) == 0) 217 return 0; 218 219 /* no physical address */ 220 if (!sc->gif_psrc || !sc->gif_pdst) 221 return 0; 222 223 switch (proto) { 224 #ifdef INET 225 case IPPROTO_IPV4: 226 break; 227 #endif 228 #ifdef INET6 229 case IPPROTO_IPV6: 230 break; 231 #endif 232 default: 233 return 0; 234 } 235 236 /* LINTED const cast */ 237 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); 238 239 switch (ip.ip_v) { 240 #ifdef INET 241 case 4: 242 if (sc->gif_psrc->sa_family != AF_INET || 243 sc->gif_pdst->sa_family != AF_INET) 244 return 0; 245 return gif_encapcheck4(m, off, proto, arg); 246 #endif 247 #ifdef INET6 248 case 6: 249 if (sc->gif_psrc->sa_family != AF_INET6 || 250 sc->gif_pdst->sa_family != AF_INET6) 251 return 0; 252 return gif_encapcheck6(m, off, proto, arg); 253 #endif 254 default: 255 return 0; 256 } 257 } 258 259 int 260 gif_output(ifp, m, dst, rt) 261 struct ifnet *ifp; 262 struct mbuf *m; 263 struct sockaddr *dst; 264 struct rtentry *rt; /* added in net2 */ 265 { 266 register struct gif_softc *sc = (struct gif_softc*)ifp; 267 int error = 0; 268 static int called = 0; /* XXX: MUTEX */ 269 270 /* 271 * gif may cause infinite recursion calls when misconfigured. 272 * We'll prevent this by introducing upper limit. 273 * XXX: this mechanism may introduce another problem about 274 * mutual exclusion of the variable CALLED, especially if we 275 * use kernel thread. 276 */ 277 if (++called > max_gif_nesting) { 278 log(LOG_NOTICE, 279 "gif_output: recursively called too many times(%d)\n", 280 called); 281 m_freem(m); 282 error = EIO; /* is there better errno? */ 283 goto end; 284 } 285 286 ifp->if_lastchange = time; 287 m->m_flags &= ~(M_BCAST|M_MCAST); 288 if (!(ifp->if_flags & IFF_UP) || 289 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 290 m_freem(m); 291 error = ENETDOWN; 292 goto end; 293 } 294 295 #if NBPFILTER > 0 296 if (ifp->if_bpf) { 297 /* 298 * We need to prepend the address family as 299 * a four byte field. Cons up a dummy header 300 * to pacify bpf. This is safe because bpf 301 * will only read from the mbuf (i.e., it won't 302 * try to free it or keep a pointer a to it). 303 */ 304 struct mbuf m0; 305 u_int af = dst->sa_family; 306 307 m0.m_next = m; 308 m0.m_len = 4; 309 m0.m_data = (char *)⁡ 310 311 #ifdef HAVE_OLD_BPF 312 bpf_mtap(ifp, &m0); 313 #else 314 bpf_mtap(ifp->if_bpf, &m0); 315 #endif 316 } 317 #endif 318 ifp->if_opackets++; 319 ifp->if_obytes += m->m_pkthdr.len; 320 321 /* XXX should we check if our outer source is legal? */ 322 323 switch (sc->gif_psrc->sa_family) { 324 #ifdef INET 325 case AF_INET: 326 error = in_gif_output(ifp, dst->sa_family, m, rt); 327 break; 328 #endif 329 #ifdef INET6 330 case AF_INET6: 331 error = in6_gif_output(ifp, dst->sa_family, m, rt); 332 break; 333 #endif 334 default: 335 m_freem(m); 336 error = ENETDOWN; 337 } 338 339 end: 340 called = 0; /* reset recursion counter */ 341 if (error) ifp->if_oerrors++; 342 return error; 343 } 344 345 void 346 gif_input(m, af, gifp) 347 struct mbuf *m; 348 int af; 349 struct ifnet *gifp; 350 { 351 int s, isr; 352 register struct ifqueue *ifq = 0; 353 354 if (gifp == NULL) { 355 /* just in case */ 356 m_freem(m); 357 return; 358 } 359 360 m->m_pkthdr.rcvif = gifp; 361 362 #if NBPFILTER > 0 363 if (gifp->if_bpf) { 364 /* 365 * We need to prepend the address family as 366 * a four byte field. Cons up a dummy header 367 * to pacify bpf. This is safe because bpf 368 * will only read from the mbuf (i.e., it won't 369 * try to free it or keep a pointer a to it). 370 */ 371 struct mbuf m0; 372 u_int af = AF_INET6; 373 374 m0.m_next = m; 375 m0.m_len = 4; 376 m0.m_data = (char *)⁡ 377 378 #ifdef HAVE_OLD_BPF 379 bpf_mtap(gifp, &m0); 380 #else 381 bpf_mtap(gifp->if_bpf, &m0); 382 #endif 383 } 384 #endif /*NBPFILTER > 0*/ 385 386 /* 387 * Put the packet to the network layer input queue according to the 388 * specified address family. 389 * Note: older versions of gif_input directly called network layer 390 * input functions, e.g. ip6_input, here. We changed the policy to 391 * prevent too many recursive calls of such input functions, which 392 * might cause kernel panic. But the change may introduce another 393 * problem; if the input queue is full, packets are discarded. 394 * We believed it rarely occurs and changed the policy. If we find 395 * it occurs more times than we thought, we may change the policy 396 * again. 397 */ 398 switch (af) { 399 #ifdef INET 400 case AF_INET: 401 ifq = &ipintrq; 402 isr = NETISR_IP; 403 break; 404 #endif 405 #ifdef INET6 406 case AF_INET6: 407 ifq = &ip6intrq; 408 isr = NETISR_IPV6; 409 break; 410 #endif 411 default: 412 m_freem(m); 413 return; 414 } 415 416 s = splimp(); 417 if (IF_QFULL(ifq)) { 418 IF_DROP(ifq); /* update statistics */ 419 m_freem(m); 420 splx(s); 421 return; 422 } 423 IF_ENQUEUE(ifq, m); 424 /* we need schednetisr since the address family may change */ 425 schednetisr(isr); 426 gifp->if_ipackets++; 427 gifp->if_ibytes += m->m_pkthdr.len; 428 splx(s); 429 430 return; 431 } 432 433 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 434 int 435 gif_ioctl(ifp, cmd, data) 436 struct ifnet *ifp; 437 u_long cmd; 438 caddr_t data; 439 { 440 struct proc *p = curproc; /* XXX */ 441 struct gif_softc *sc = (struct gif_softc*)ifp; 442 struct ifreq *ifr = (struct ifreq*)data; 443 int error = 0, size; 444 struct sockaddr *dst, *src; 445 struct sockaddr *sa; 446 struct gif_softc *sc2; 447 448 switch (cmd) { 449 case SIOCSIFADDR: 450 break; 451 452 case SIOCSIFDSTADDR: 453 break; 454 455 case SIOCADDMULTI: 456 case SIOCDELMULTI: 457 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 458 break; 459 switch (ifr->ifr_addr.sa_family) { 460 #ifdef INET 461 case AF_INET: /* IP supports Multicast */ 462 break; 463 #endif /* INET */ 464 #ifdef INET6 465 case AF_INET6: /* IP6 supports Multicast */ 466 break; 467 #endif /* INET6 */ 468 default: /* Other protocols doesn't support Multicast */ 469 error = EAFNOSUPPORT; 470 break; 471 } 472 break; 473 474 #ifdef SIOCSIFMTU /* xxx */ 475 case SIOCGIFMTU: 476 break; 477 478 case SIOCSIFMTU: 479 { 480 u_long mtu; 481 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 482 break; 483 mtu = ifr->ifr_mtu; 484 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) { 485 return (EINVAL); 486 } 487 ifp->if_mtu = mtu; 488 } 489 break; 490 #endif /* SIOCSIFMTU */ 491 492 case SIOCSIFPHYADDR: 493 #ifdef INET6 494 case SIOCSIFPHYADDR_IN6: 495 #endif /* INET6 */ 496 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 497 break; 498 switch (cmd) { 499 #ifdef INET 500 case SIOCSIFPHYADDR: 501 src = (struct sockaddr *) 502 &(((struct in_aliasreq *)data)->ifra_addr); 503 dst = (struct sockaddr *) 504 &(((struct in_aliasreq *)data)->ifra_dstaddr); 505 if (src->sa_len != sizeof(struct sockaddr_in) || 506 dst->sa_len != sizeof(struct sockaddr_in)) 507 return EINVAL; 508 if (src->sa_family != AF_INET || 509 dst->sa_family != AF_INET) 510 return EAFNOSUPPORT; 511 break; 512 #endif 513 #ifdef INET6 514 case SIOCSIFPHYADDR_IN6: 515 src = (struct sockaddr *) 516 &(((struct in6_aliasreq *)data)->ifra_addr); 517 dst = (struct sockaddr *) 518 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 519 if (src->sa_len != sizeof(struct sockaddr_in6) || 520 dst->sa_len != sizeof(struct sockaddr_in6)) 521 return EINVAL; 522 if (src->sa_family != AF_INET6 || 523 dst->sa_family != AF_INET6) 524 return EAFNOSUPPORT; 525 break; 526 #endif 527 } 528 529 for (sc2 = LIST_FIRST(&gif_softc_list); sc2 != NULL; 530 sc2 = LIST_NEXT(sc2, gif_list)) { 531 if (sc2 == sc) 532 continue; 533 if (!sc2->gif_pdst || !sc2->gif_psrc) 534 continue; 535 if (sc2->gif_pdst->sa_family != dst->sa_family || 536 sc2->gif_pdst->sa_len != dst->sa_len || 537 sc2->gif_psrc->sa_family != src->sa_family || 538 sc2->gif_psrc->sa_len != src->sa_len) 539 continue; 540 541 /* can't configure same pair of address onto two gifs */ 542 if (bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 543 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 544 error = EADDRNOTAVAIL; 545 goto bad; 546 } 547 548 /* can't configure multiple multi-dest interfaces */ 549 #define multidest(x) \ 550 (((struct sockaddr_in *)(x))->sin_addr.s_addr == INADDR_ANY) 551 #ifdef INET6 552 #define multidest6(x) \ 553 (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)(x))->sin6_addr)) 554 #endif 555 if (dst->sa_family == AF_INET && 556 multidest(dst) && multidest(sc2->gif_pdst)) { 557 error = EADDRNOTAVAIL; 558 goto bad; 559 } 560 #ifdef INET6 561 if (dst->sa_family == AF_INET6 && 562 multidest6(dst) && multidest6(sc2->gif_pdst)) { 563 error = EADDRNOTAVAIL; 564 goto bad; 565 } 566 #endif 567 } 568 569 if (src->sa_family != dst->sa_family || 570 src->sa_len != dst->sa_len) { 571 error = EINVAL; 572 break; 573 } 574 switch (src->sa_family) { 575 #ifdef INET 576 case AF_INET: 577 size = sizeof(struct sockaddr_in); 578 break; 579 #endif 580 #ifdef INET6 581 case AF_INET6: 582 size = sizeof(struct sockaddr_in6); 583 break; 584 #endif 585 default: 586 error = EAFNOSUPPORT; 587 goto bad; 588 } 589 if (src->sa_len != size) { 590 error = EINVAL; 591 break; 592 } 593 594 if (sc->gif_psrc) 595 free((caddr_t)sc->gif_psrc, M_IFADDR); 596 sa = (struct sockaddr *)malloc(size, M_IFADDR, M_WAITOK); 597 bcopy((caddr_t)src, (caddr_t)sa, size); 598 sc->gif_psrc = sa; 599 600 if (sc->gif_pdst) 601 free((caddr_t)sc->gif_pdst, M_IFADDR); 602 sa = (struct sockaddr *)malloc(size, M_IFADDR, M_WAITOK); 603 bcopy((caddr_t)dst, (caddr_t)sa, size); 604 sc->gif_pdst = sa; 605 606 ifp->if_flags |= IFF_UP; 607 if_up(ifp); /* send up RTM_IFINFO */ 608 609 error = 0; 610 break; 611 612 #ifdef SIOCDIFPHYADDR 613 case SIOCDIFPHYADDR: 614 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 615 break; 616 gif_delete_tunnel(sc); 617 break; 618 #endif 619 620 case SIOCGIFPSRCADDR: 621 #ifdef INET6 622 case SIOCGIFPSRCADDR_IN6: 623 #endif /* INET6 */ 624 if (sc->gif_psrc == NULL) { 625 error = EADDRNOTAVAIL; 626 goto bad; 627 } 628 src = sc->gif_psrc; 629 switch (cmd) { 630 #ifdef INET 631 case SIOCGIFPSRCADDR: 632 dst = &ifr->ifr_addr; 633 size = sizeof(ifr->ifr_addr); 634 break; 635 #endif /* INET */ 636 #ifdef INET6 637 case SIOCGIFPSRCADDR_IN6: 638 dst = (struct sockaddr *) 639 &(((struct in6_ifreq *)data)->ifr_addr); 640 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 641 break; 642 #endif /* INET6 */ 643 default: 644 error = EADDRNOTAVAIL; 645 goto bad; 646 } 647 if (src->sa_len > size) 648 return EINVAL; 649 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 650 break; 651 652 case SIOCGIFPDSTADDR: 653 #ifdef INET6 654 case SIOCGIFPDSTADDR_IN6: 655 #endif /* INET6 */ 656 if (sc->gif_pdst == NULL) { 657 error = EADDRNOTAVAIL; 658 goto bad; 659 } 660 src = sc->gif_pdst; 661 switch (cmd) { 662 #ifdef INET 663 case SIOCGIFPDSTADDR: 664 dst = &ifr->ifr_addr; 665 size = sizeof(ifr->ifr_addr); 666 break; 667 #endif /* INET */ 668 #ifdef INET6 669 case SIOCGIFPDSTADDR_IN6: 670 dst = (struct sockaddr *) 671 &(((struct in6_ifreq *)data)->ifr_addr); 672 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 673 break; 674 #endif /* INET6 */ 675 default: 676 error = EADDRNOTAVAIL; 677 goto bad; 678 } 679 if (src->sa_len > size) 680 return EINVAL; 681 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 682 break; 683 684 case SIOCSIFFLAGS: 685 /* if_ioctl() takes care of it */ 686 break; 687 688 default: 689 error = EINVAL; 690 break; 691 } 692 bad: 693 return error; 694 } 695 696 void 697 gif_delete_tunnel(sc) 698 struct gif_softc *sc; 699 { 700 int s; 701 702 s = splsoftnet(); 703 704 if (sc->gif_psrc) { 705 free((caddr_t)sc->gif_psrc, M_IFADDR); 706 sc->gif_psrc = NULL; 707 } 708 if (sc->gif_pdst) { 709 free((caddr_t)sc->gif_pdst, M_IFADDR); 710 sc->gif_pdst = NULL; 711 } 712 /* change the IFF_UP flag as well? */ 713 714 splx(s); 715 } 716 #endif /*NGIF > 0*/ 717
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