1 /* $NetBSD: if_gif.c,v 1.77 2010/01/19 22:08:00 pooka Exp $ */ 2 /* $KAME: if_gif.c,v 1.76 2001/08/20 02:01:02 kjc 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 <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: if_gif.c,v 1.77 2010/01/19 22:08:00 pooka Exp $"); 35 36 #include "opt_inet.h" 37 #include "opt_iso.h" 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/kernel.h> 42 #include <sys/mbuf.h> 43 #include <sys/socket.h> 44 #include <sys/sockio.h> 45 #include <sys/errno.h> 46 #include <sys/ioctl.h> 47 #include <sys/time.h> 48 #include <sys/syslog.h> 49 #include <sys/proc.h> 50 #include <sys/protosw.h> 51 #include <sys/kauth.h> 52 #include <sys/cpu.h> 53 #include <sys/intr.h> 54 55 #include <net/if.h> 56 #include <net/if_types.h> 57 #include <net/netisr.h> 58 #include <net/route.h> 59 #include <net/bpf.h> 60 61 #include <netinet/in.h> 62 #include <netinet/in_systm.h> 63 #include <netinet/ip.h> 64 #ifdef INET 65 #include <netinet/in_var.h> 66 #endif /* INET */ 67 #include <netinet/in_gif.h> 68 69 #ifdef INET6 70 #ifndef INET 71 #include <netinet/in.h> 72 #endif 73 #include <netinet6/in6_var.h> 74 #include <netinet/ip6.h> 75 #include <netinet6/ip6_var.h> 76 #include <netinet6/in6_gif.h> 77 #include <netinet6/ip6protosw.h> 78 #endif /* INET6 */ 79 80 #ifdef ISO 81 #include <netiso/iso.h> 82 #include <netiso/iso_var.h> 83 #endif 84 85 #include <netinet/ip_encap.h> 86 #include <net/if_gif.h> 87 88 89 #include <net/net_osdep.h> 90 91 void gifattach(int); 92 static void gifintr(void *); 93 #ifdef ISO 94 static struct mbuf *gif_eon_encap(struct mbuf *); 95 static struct mbuf *gif_eon_decap(struct ifnet *, struct mbuf *); 96 #endif 97 98 /* 99 * gif global variable definitions 100 */ 101 LIST_HEAD(, gif_softc) gif_softc_list; /* XXX should be static */ 102 103 static int gif_clone_create(struct if_clone *, int); 104 static int gif_clone_destroy(struct ifnet *); 105 106 static struct if_clone gif_cloner = 107 IF_CLONE_INITIALIZER("gif", gif_clone_create, gif_clone_destroy); 108 109 #ifndef MAX_GIF_NEST 110 /* 111 * This macro controls the upper limitation on nesting of gif tunnels. 112 * Since, setting a large value to this macro with a careless configuration 113 * may introduce system crash, we don't allow any nestings by default. 114 * If you need to configure nested gif tunnels, you can define this macro 115 * in your kernel configuration file. However, if you do so, please be 116 * careful to configure the tunnels so that it won't make a loop. 117 */ 118 #define MAX_GIF_NEST 1 119 #endif 120 static int max_gif_nesting = MAX_GIF_NEST; 121 122 /* ARGSUSED */ 123 void 124 gifattach(int count) 125 { 126 127 LIST_INIT(&gif_softc_list); 128 if_clone_attach(&gif_cloner); 129 } 130 131 static int 132 gif_clone_create(struct if_clone *ifc, int unit) 133 { 134 struct gif_softc *sc; 135 136 sc = malloc(sizeof(struct gif_softc), M_DEVBUF, M_WAITOK|M_ZERO); 137 138 if_initname(&sc->gif_if, ifc->ifc_name, unit); 139 140 gifattach0(sc); 141 142 LIST_INSERT_HEAD(&gif_softc_list, sc, gif_list); 143 return (0); 144 } 145 146 void 147 gifattach0(struct gif_softc *sc) 148 { 149 150 sc->encap_cookie4 = sc->encap_cookie6 = NULL; 151 152 sc->gif_if.if_addrlen = 0; 153 sc->gif_if.if_mtu = GIF_MTU; 154 sc->gif_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 155 sc->gif_if.if_ioctl = gif_ioctl; 156 sc->gif_if.if_output = gif_output; 157 sc->gif_if.if_type = IFT_GIF; 158 sc->gif_if.if_dlt = DLT_NULL; 159 sc->gif_if.if_softc = sc; 160 IFQ_SET_READY(&sc->gif_if.if_snd); 161 if_attach(&sc->gif_if); 162 if_alloc_sadl(&sc->gif_if); 163 bpf_ops->bpf_attach(&sc->gif_if, DLT_NULL, 164 sizeof(u_int), &sc->gif_if.if_bpf); 165 } 166 167 static int 168 gif_clone_destroy(struct ifnet *ifp) 169 { 170 struct gif_softc *sc = (void *) ifp; 171 172 gif_delete_tunnel(&sc->gif_if); 173 LIST_REMOVE(sc, gif_list); 174 #ifdef INET6 175 encap_detach(sc->encap_cookie6); 176 #endif 177 #ifdef INET 178 encap_detach(sc->encap_cookie4); 179 #endif 180 181 bpf_ops->bpf_detach(ifp); 182 if_detach(ifp); 183 rtcache_free(&sc->gif_ro); 184 185 free(sc, M_DEVBUF); 186 187 return (0); 188 } 189 190 #ifdef GIF_ENCAPCHECK 191 int 192 gif_encapcheck(struct mbuf *m, int off, int proto, void *arg) 193 { 194 struct ip ip; 195 struct gif_softc *sc; 196 197 sc = arg; 198 if (sc == NULL) 199 return 0; 200 201 if ((sc->gif_if.if_flags & IFF_UP) == 0) 202 return 0; 203 204 /* no physical address */ 205 if (!sc->gif_psrc || !sc->gif_pdst) 206 return 0; 207 208 switch (proto) { 209 #ifdef INET 210 case IPPROTO_IPV4: 211 break; 212 #endif 213 #ifdef INET6 214 case IPPROTO_IPV6: 215 break; 216 #endif 217 #ifdef ISO 218 case IPPROTO_EON: 219 break; 220 #endif 221 default: 222 return 0; 223 } 224 225 /* Bail on short packets */ 226 KASSERT(m->m_flags & M_PKTHDR); 227 if (m->m_pkthdr.len < sizeof(ip)) 228 return 0; 229 230 m_copydata(m, 0, sizeof(ip), &ip); 231 232 switch (ip.ip_v) { 233 #ifdef INET 234 case 4: 235 if (sc->gif_psrc->sa_family != AF_INET || 236 sc->gif_pdst->sa_family != AF_INET) 237 return 0; 238 return gif_encapcheck4(m, off, proto, arg); 239 #endif 240 #ifdef INET6 241 case 6: 242 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) 243 return 0; 244 if (sc->gif_psrc->sa_family != AF_INET6 || 245 sc->gif_pdst->sa_family != AF_INET6) 246 return 0; 247 return gif_encapcheck6(m, off, proto, arg); 248 #endif 249 default: 250 return 0; 251 } 252 } 253 #endif 254 255 int 256 gif_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 257 struct rtentry *rt) 258 { 259 struct gif_softc *sc = ifp->if_softc; 260 int error = 0; 261 static int called = 0; /* XXX: MUTEX */ 262 ALTQ_DECL(struct altq_pktattr pktattr;) 263 int s; 264 265 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 266 267 /* 268 * gif may cause infinite recursion calls when misconfigured. 269 * We'll prevent this by introducing upper limit. 270 * XXX: this mechanism may introduce another problem about 271 * mutual exclusion of the variable CALLED, especially if we 272 * use kernel thread. 273 */ 274 if (++called > max_gif_nesting) { 275 log(LOG_NOTICE, 276 "gif_output: recursively called too many times(%d)\n", 277 called); 278 m_freem(m); 279 error = EIO; /* is there better errno? */ 280 goto end; 281 } 282 283 m->m_flags &= ~(M_BCAST|M_MCAST); 284 if (!(ifp->if_flags & IFF_UP) || 285 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 286 m_freem(m); 287 error = ENETDOWN; 288 goto end; 289 } 290 291 /* inner AF-specific encapsulation */ 292 switch (dst->sa_family) { 293 #ifdef ISO 294 case AF_ISO: 295 m = gif_eon_encap(m); 296 if (!m) { 297 error = ENOBUFS; 298 goto end; 299 } 300 break; 301 #endif 302 default: 303 break; 304 } 305 306 /* XXX should we check if our outer source is legal? */ 307 308 /* use DLT_NULL encapsulation here to pass inner af type */ 309 M_PREPEND(m, sizeof(int), M_DONTWAIT); 310 if (!m) { 311 error = ENOBUFS; 312 goto end; 313 } 314 *mtod(m, int *) = dst->sa_family; 315 316 s = splnet(); 317 IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error); 318 if (error) { 319 splx(s); 320 goto end; 321 } 322 splx(s); 323 324 softint_schedule(sc->gif_si); 325 error = 0; 326 327 end: 328 called = 0; /* reset recursion counter */ 329 if (error) 330 ifp->if_oerrors++; 331 return error; 332 } 333 334 static void 335 gifintr(void *arg) 336 { 337 struct gif_softc *sc; 338 struct ifnet *ifp; 339 struct mbuf *m; 340 int family; 341 int len; 342 int s; 343 int error; 344 345 sc = arg; 346 ifp = &sc->gif_if; 347 348 /* output processing */ 349 while (1) { 350 s = splnet(); 351 IFQ_DEQUEUE(&sc->gif_if.if_snd, m); 352 splx(s); 353 if (m == NULL) 354 break; 355 356 /* grab and chop off inner af type */ 357 if (sizeof(int) > m->m_len) { 358 m = m_pullup(m, sizeof(int)); 359 if (!m) { 360 ifp->if_oerrors++; 361 continue; 362 } 363 } 364 family = *mtod(m, int *); 365 if (ifp->if_bpf) 366 bpf_ops->bpf_mtap(ifp->if_bpf, m); 367 m_adj(m, sizeof(int)); 368 369 len = m->m_pkthdr.len; 370 371 /* dispatch to output logic based on outer AF */ 372 switch (sc->gif_psrc->sa_family) { 373 #ifdef INET 374 case AF_INET: 375 error = in_gif_output(ifp, family, m); 376 break; 377 #endif 378 #ifdef INET6 379 case AF_INET6: 380 error = in6_gif_output(ifp, family, m); 381 break; 382 #endif 383 default: 384 m_freem(m); 385 error = ENETDOWN; 386 break; 387 } 388 389 if (error) 390 ifp->if_oerrors++; 391 else { 392 ifp->if_opackets++; 393 ifp->if_obytes += len; 394 } 395 } 396 } 397 398 void 399 gif_input(struct mbuf *m, int af, struct ifnet *ifp) 400 { 401 int s, isr; 402 struct ifqueue *ifq = NULL; 403 404 if (ifp == NULL) { 405 /* just in case */ 406 m_freem(m); 407 return; 408 } 409 410 m->m_pkthdr.rcvif = ifp; 411 412 if (ifp->if_bpf) 413 bpf_ops->bpf_mtap_af(ifp->if_bpf, af, m); 414 415 /* 416 * Put the packet to the network layer input queue according to the 417 * specified address family. 418 * Note: older versions of gif_input directly called network layer 419 * input functions, e.g. ip6_input, here. We changed the policy to 420 * prevent too many recursive calls of such input functions, which 421 * might cause kernel panic. But the change may introduce another 422 * problem; if the input queue is full, packets are discarded. 423 * The kernel stack overflow really happened, and we believed 424 * queue-full rarely occurs, so we changed the policy. 425 */ 426 switch (af) { 427 #ifdef INET 428 case AF_INET: 429 ifq = &ipintrq; 430 isr = NETISR_IP; 431 break; 432 #endif 433 #ifdef INET6 434 case AF_INET6: 435 ifq = &ip6intrq; 436 isr = NETISR_IPV6; 437 break; 438 #endif 439 #ifdef ISO 440 case AF_ISO: 441 m = gif_eon_decap(ifp, m); 442 if (!m) 443 return; 444 ifq = &clnlintrq; 445 isr = NETISR_ISO; 446 break; 447 #endif 448 default: 449 m_freem(m); 450 return; 451 } 452 453 s = splnet(); 454 if (IF_QFULL(ifq)) { 455 IF_DROP(ifq); /* update statistics */ 456 m_freem(m); 457 splx(s); 458 return; 459 } 460 ifp->if_ipackets++; 461 ifp->if_ibytes += m->m_pkthdr.len; 462 IF_ENQUEUE(ifq, m); 463 /* we need schednetisr since the address family may change */ 464 schednetisr(isr); 465 splx(s); 466 } 467 468 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 469 int 470 gif_ioctl(struct ifnet *ifp, u_long cmd, void *data) 471 { 472 struct lwp *l = curlwp; /* XXX */ 473 struct gif_softc *sc = ifp->if_softc; 474 struct ifreq *ifr = (struct ifreq*)data; 475 int error = 0, size; 476 struct sockaddr *dst, *src; 477 478 switch (cmd) { 479 case SIOCSIFMTU: 480 case SIOCSLIFPHYADDR: 481 #ifdef SIOCDIFPHYADDR 482 case SIOCDIFPHYADDR: 483 #endif 484 if ((error = kauth_authorize_network(l->l_cred, 485 KAUTH_NETWORK_INTERFACE, 486 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 487 NULL)) != 0) 488 return (error); 489 /* FALLTHROUGH */ 490 default: 491 break; 492 } 493 494 switch (cmd) { 495 case SIOCINITIFADDR: 496 ifp->if_flags |= IFF_UP; 497 break; 498 499 case SIOCSIFDSTADDR: 500 break; 501 502 case SIOCADDMULTI: 503 case SIOCDELMULTI: 504 switch (ifr->ifr_addr.sa_family) { 505 #ifdef INET 506 case AF_INET: /* IP supports Multicast */ 507 break; 508 #endif /* INET */ 509 #ifdef INET6 510 case AF_INET6: /* IP6 supports Multicast */ 511 break; 512 #endif /* INET6 */ 513 default: /* Other protocols doesn't support Multicast */ 514 error = EAFNOSUPPORT; 515 break; 516 } 517 break; 518 519 case SIOCGIFMTU: 520 break; 521 522 case SIOCSIFMTU: 523 if (ifr->ifr_mtu < GIF_MTU_MIN || ifr->ifr_mtu > GIF_MTU_MAX) 524 return EINVAL; 525 else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 526 error = 0; 527 break; 528 529 #ifdef INET 530 case SIOCSIFPHYADDR: 531 #endif 532 #ifdef INET6 533 case SIOCSIFPHYADDR_IN6: 534 #endif /* INET6 */ 535 case SIOCSLIFPHYADDR: 536 switch (cmd) { 537 #ifdef INET 538 case SIOCSIFPHYADDR: 539 src = (struct sockaddr *) 540 &(((struct in_aliasreq *)data)->ifra_addr); 541 dst = (struct sockaddr *) 542 &(((struct in_aliasreq *)data)->ifra_dstaddr); 543 break; 544 #endif 545 #ifdef INET6 546 case SIOCSIFPHYADDR_IN6: 547 src = (struct sockaddr *) 548 &(((struct in6_aliasreq *)data)->ifra_addr); 549 dst = (struct sockaddr *) 550 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 551 break; 552 #endif 553 case SIOCSLIFPHYADDR: 554 src = (struct sockaddr *) 555 &(((struct if_laddrreq *)data)->addr); 556 dst = (struct sockaddr *) 557 &(((struct if_laddrreq *)data)->dstaddr); 558 break; 559 default: 560 return EINVAL; 561 } 562 563 /* sa_family must be equal */ 564 if (src->sa_family != dst->sa_family) 565 return EINVAL; 566 567 /* validate sa_len */ 568 switch (src->sa_family) { 569 #ifdef INET 570 case AF_INET: 571 if (src->sa_len != sizeof(struct sockaddr_in)) 572 return EINVAL; 573 break; 574 #endif 575 #ifdef INET6 576 case AF_INET6: 577 if (src->sa_len != sizeof(struct sockaddr_in6)) 578 return EINVAL; 579 break; 580 #endif 581 default: 582 return EAFNOSUPPORT; 583 } 584 switch (dst->sa_family) { 585 #ifdef INET 586 case AF_INET: 587 if (dst->sa_len != sizeof(struct sockaddr_in)) 588 return EINVAL; 589 break; 590 #endif 591 #ifdef INET6 592 case AF_INET6: 593 if (dst->sa_len != sizeof(struct sockaddr_in6)) 594 return EINVAL; 595 break; 596 #endif 597 default: 598 return EAFNOSUPPORT; 599 } 600 601 /* check sa_family looks sane for the cmd */ 602 switch (cmd) { 603 case SIOCSIFPHYADDR: 604 if (src->sa_family == AF_INET) 605 break; 606 return EAFNOSUPPORT; 607 #ifdef INET6 608 case SIOCSIFPHYADDR_IN6: 609 if (src->sa_family == AF_INET6) 610 break; 611 return EAFNOSUPPORT; 612 #endif /* INET6 */ 613 case SIOCSLIFPHYADDR: 614 /* checks done in the above */ 615 break; 616 } 617 618 error = gif_set_tunnel(&sc->gif_if, src, dst); 619 break; 620 621 #ifdef SIOCDIFPHYADDR 622 case SIOCDIFPHYADDR: 623 gif_delete_tunnel(&sc->gif_if); 624 break; 625 #endif 626 627 case SIOCGIFPSRCADDR: 628 #ifdef INET6 629 case SIOCGIFPSRCADDR_IN6: 630 #endif /* INET6 */ 631 if (sc->gif_psrc == NULL) { 632 error = EADDRNOTAVAIL; 633 goto bad; 634 } 635 src = sc->gif_psrc; 636 switch (cmd) { 637 #ifdef INET 638 case SIOCGIFPSRCADDR: 639 dst = &ifr->ifr_addr; 640 size = sizeof(ifr->ifr_addr); 641 break; 642 #endif /* INET */ 643 #ifdef INET6 644 case SIOCGIFPSRCADDR_IN6: 645 dst = (struct sockaddr *) 646 &(((struct in6_ifreq *)data)->ifr_addr); 647 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 648 break; 649 #endif /* INET6 */ 650 default: 651 error = EADDRNOTAVAIL; 652 goto bad; 653 } 654 if (src->sa_len > size) 655 return EINVAL; 656 memcpy(dst, src, src->sa_len); 657 break; 658 659 case SIOCGIFPDSTADDR: 660 #ifdef INET6 661 case SIOCGIFPDSTADDR_IN6: 662 #endif /* INET6 */ 663 if (sc->gif_pdst == NULL) { 664 error = EADDRNOTAVAIL; 665 goto bad; 666 } 667 src = sc->gif_pdst; 668 switch (cmd) { 669 #ifdef INET 670 case SIOCGIFPDSTADDR: 671 dst = &ifr->ifr_addr; 672 size = sizeof(ifr->ifr_addr); 673 break; 674 #endif /* INET */ 675 #ifdef INET6 676 case SIOCGIFPDSTADDR_IN6: 677 dst = (struct sockaddr *) 678 &(((struct in6_ifreq *)data)->ifr_addr); 679 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 680 break; 681 #endif /* INET6 */ 682 default: 683 error = EADDRNOTAVAIL; 684 goto bad; 685 } 686 if (src->sa_len > size) 687 return EINVAL; 688 memcpy(dst, src, src->sa_len); 689 break; 690 691 case SIOCGLIFPHYADDR: 692 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 693 error = EADDRNOTAVAIL; 694 goto bad; 695 } 696 697 /* copy src */ 698 src = sc->gif_psrc; 699 dst = (struct sockaddr *) 700 &(((struct if_laddrreq *)data)->addr); 701 size = sizeof(((struct if_laddrreq *)data)->addr); 702 if (src->sa_len > size) 703 return EINVAL; 704 memcpy(dst, src, src->sa_len); 705 706 /* copy dst */ 707 src = sc->gif_pdst; 708 dst = (struct sockaddr *) 709 &(((struct if_laddrreq *)data)->dstaddr); 710 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 711 if (src->sa_len > size) 712 return EINVAL; 713 memcpy(dst, src, src->sa_len); 714 break; 715 716 default: 717 return ifioctl_common(ifp, cmd, data); 718 } 719 bad: 720 return error; 721 } 722 723 int 724 gif_set_tunnel(struct ifnet *ifp, struct sockaddr *src, struct sockaddr *dst) 725 { 726 struct gif_softc *sc = ifp->if_softc; 727 struct gif_softc *sc2; 728 struct sockaddr *osrc, *odst; 729 int s; 730 int error; 731 732 s = splsoftnet(); 733 734 LIST_FOREACH(sc2, &gif_softc_list, gif_list) { 735 if (sc2 == sc) 736 continue; 737 if (!sc2->gif_pdst || !sc2->gif_psrc) 738 continue; 739 /* can't configure same pair of address onto two gifs */ 740 if (sockaddr_cmp(sc2->gif_pdst, dst) == 0 && 741 sockaddr_cmp(sc2->gif_psrc, src) == 0) { 742 error = EADDRNOTAVAIL; 743 goto bad; 744 } 745 746 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 747 } 748 749 if (sc->gif_si) { 750 softint_disestablish(sc->gif_si); 751 sc->gif_si = NULL; 752 } 753 754 /* XXX we can detach from both, but be polite just in case */ 755 if (sc->gif_psrc) 756 switch (sc->gif_psrc->sa_family) { 757 #ifdef INET 758 case AF_INET: 759 (void)in_gif_detach(sc); 760 break; 761 #endif 762 #ifdef INET6 763 case AF_INET6: 764 (void)in6_gif_detach(sc); 765 break; 766 #endif 767 } 768 769 sc->gif_si = softint_establish(SOFTINT_NET, gifintr, sc); 770 if (sc->gif_si == NULL) { 771 error = ENOMEM; 772 goto bad; 773 } 774 775 osrc = sc->gif_psrc; 776 sc->gif_psrc = sockaddr_dup(src, M_WAITOK); 777 778 odst = sc->gif_pdst; 779 sc->gif_pdst = sockaddr_dup(dst, M_WAITOK); 780 781 switch (sc->gif_psrc->sa_family) { 782 #ifdef INET 783 case AF_INET: 784 error = in_gif_attach(sc); 785 break; 786 #endif 787 #ifdef INET6 788 case AF_INET6: 789 error = in6_gif_attach(sc); 790 break; 791 #endif 792 default: 793 error = EINVAL; 794 break; 795 } 796 if (error) { 797 /* rollback */ 798 sockaddr_free(sc->gif_psrc); 799 sockaddr_free(sc->gif_pdst); 800 sc->gif_psrc = osrc; 801 sc->gif_pdst = odst; 802 goto bad; 803 } 804 805 if (osrc) 806 sockaddr_free(osrc); 807 if (odst) 808 sockaddr_free(odst); 809 810 if (sc->gif_psrc && sc->gif_pdst) 811 ifp->if_flags |= IFF_RUNNING; 812 else 813 ifp->if_flags &= ~IFF_RUNNING; 814 splx(s); 815 816 return 0; 817 818 bad: 819 if (sc->gif_si) { 820 softint_disestablish(sc->gif_si); 821 sc->gif_si = NULL; 822 } 823 if (sc->gif_psrc && sc->gif_pdst) 824 ifp->if_flags |= IFF_RUNNING; 825 else 826 ifp->if_flags &= ~IFF_RUNNING; 827 splx(s); 828 829 return error; 830 } 831 832 void 833 gif_delete_tunnel(struct ifnet *ifp) 834 { 835 struct gif_softc *sc = ifp->if_softc; 836 int s; 837 838 s = splsoftnet(); 839 840 if (sc->gif_si) { 841 softint_disestablish(sc->gif_si); 842 sc->gif_si = NULL; 843 } 844 if (sc->gif_psrc) { 845 sockaddr_free(sc->gif_psrc); 846 sc->gif_psrc = NULL; 847 } 848 if (sc->gif_pdst) { 849 sockaddr_free(sc->gif_pdst); 850 sc->gif_pdst = NULL; 851 } 852 /* it is safe to detach from both */ 853 #ifdef INET 854 (void)in_gif_detach(sc); 855 #endif 856 #ifdef INET6 857 (void)in6_gif_detach(sc); 858 #endif 859 860 if (sc->gif_psrc && sc->gif_pdst) 861 ifp->if_flags |= IFF_RUNNING; 862 else 863 ifp->if_flags &= ~IFF_RUNNING; 864 splx(s); 865 } 866 867 #ifdef ISO 868 struct eonhdr { 869 uint8_t version; 870 uint8_t class; 871 uint16_t cksum; 872 }; 873 874 /* 875 * prepend EON header to ISO PDU 876 */ 877 static struct mbuf * 878 gif_eon_encap(struct mbuf *m) 879 { 880 struct eonhdr *ehdr; 881 882 M_PREPEND(m, sizeof(*ehdr), M_DONTWAIT); 883 if (m && m->m_len < sizeof(*ehdr)) 884 m = m_pullup(m, sizeof(*ehdr)); 885 if (m == NULL) 886 return NULL; 887 ehdr = mtod(m, struct eonhdr *); 888 ehdr->version = 1; 889 ehdr->class = 0; /* always unicast */ 890 #if 0 891 /* calculate the checksum of the eonhdr */ 892 { 893 struct mbuf mhead; 894 memset(&mhead, 0, sizeof(mhead)); 895 ehdr->cksum = 0; 896 mhead.m_data = (void *)ehdr; 897 mhead.m_len = sizeof(*ehdr); 898 mhead.m_next = 0; 899 iso_gen_csum(&mhead, offsetof(struct eonhdr, cksum), 900 mhead.m_len); 901 } 902 #else 903 /* since the data is always constant we'll just plug the value in */ 904 ehdr->cksum = htons(0xfc02); 905 #endif 906 return m; 907 } 908 909 /* 910 * remove EON header and check checksum 911 */ 912 static struct mbuf * 913 gif_eon_decap(struct ifnet *ifp, struct mbuf *m) 914 { 915 struct eonhdr *ehdr; 916 917 if (m->m_len < sizeof(*ehdr) && 918 (m = m_pullup(m, sizeof(*ehdr))) == NULL) { 919 ifp->if_ierrors++; 920 return NULL; 921 } 922 if (iso_check_csum(m, sizeof(struct eonhdr))) { 923 m_freem(m); 924 return NULL; 925 } 926 m_adj(m, sizeof(*ehdr)); 927 return m; 928 } 929 #endif /*ISO*/ 930