1 /* $NetBSD: if_gif.c,v 1.72 2007/10/08 16:18:05 ad 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 1.72 2007/10/08 16:18:05 ad 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 #include "bpfilter.h" 89 90 #include <net/net_osdep.h> 91 92 void gifattach(int); 93 static void gifintr(void *); 94 #ifdef ISO 95 static struct mbuf *gif_eon_encap(struct mbuf *); 96 static struct mbuf *gif_eon_decap(struct ifnet *, struct mbuf *); 97 #endif 98 99 /* 100 * gif global variable definitions 101 */ 102 LIST_HEAD(, gif_softc) gif_softc_list; /* XXX should be static */ 103 104 static int gif_clone_create(struct if_clone *, int); 105 static int gif_clone_destroy(struct ifnet *); 106 107 static struct if_clone gif_cloner = 108 IF_CLONE_INITIALIZER("gif", gif_clone_create, gif_clone_destroy); 109 110 #ifndef MAX_GIF_NEST 111 /* 112 * This macro controls the upper limitation on nesting of gif tunnels. 113 * Since, setting a large value to this macro with a careless configuration 114 * may introduce system crash, we don't allow any nestings by default. 115 * If you need to configure nested gif tunnels, you can define this macro 116 * in your kernel configuration file. However, if you do so, please be 117 * careful to configure the tunnels so that it won't make a loop. 118 */ 119 #define MAX_GIF_NEST 1 120 #endif 121 static int max_gif_nesting = MAX_GIF_NEST; 122 123 /* ARGSUSED */ 124 void 125 gifattach(int count) 126 { 127 128 LIST_INIT(&gif_softc_list); 129 if_clone_attach(&gif_cloner); 130 } 131 132 static int 133 gif_clone_create(struct if_clone *ifc, int unit) 134 { 135 struct gif_softc *sc; 136 137 sc = malloc(sizeof(struct gif_softc), M_DEVBUF, M_WAITOK); 138 memset(sc, 0, sizeof(struct gif_softc)); 139 140 snprintf(sc->gif_if.if_xname, sizeof(sc->gif_if.if_xname), "%s%d", 141 ifc->ifc_name, unit); 142 143 gifattach0(sc); 144 145 LIST_INSERT_HEAD(&gif_softc_list, sc, gif_list); 146 return (0); 147 } 148 149 void 150 gifattach0(struct gif_softc *sc) 151 { 152 153 sc->encap_cookie4 = sc->encap_cookie6 = NULL; 154 155 sc->gif_if.if_addrlen = 0; 156 sc->gif_if.if_mtu = GIF_MTU; 157 sc->gif_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 158 sc->gif_if.if_ioctl = gif_ioctl; 159 sc->gif_if.if_output = gif_output; 160 sc->gif_if.if_type = IFT_GIF; 161 sc->gif_if.if_dlt = DLT_NULL; 162 IFQ_SET_READY(&sc->gif_if.if_snd); 163 if_attach(&sc->gif_if); 164 if_alloc_sadl(&sc->gif_if); 165 #if NBPFILTER > 0 166 bpfattach(&sc->gif_if, DLT_NULL, sizeof(u_int)); 167 #endif 168 } 169 170 static int 171 gif_clone_destroy(struct ifnet *ifp) 172 { 173 struct gif_softc *sc = (void *) ifp; 174 175 gif_delete_tunnel(&sc->gif_if); 176 LIST_REMOVE(sc, gif_list); 177 #ifdef INET6 178 encap_detach(sc->encap_cookie6); 179 #endif 180 #ifdef INET 181 encap_detach(sc->encap_cookie4); 182 #endif 183 184 #if NBPFILTER > 0 185 bpfdetach(ifp); 186 #endif 187 if_detach(ifp); 188 rtcache_free(&sc->gif_ro); 189 190 free(sc, M_DEVBUF); 191 192 return (0); 193 } 194 195 #ifdef GIF_ENCAPCHECK 196 int 197 gif_encapcheck(struct mbuf *m, int off, int proto, void *arg) 198 { 199 struct ip ip; 200 struct gif_softc *sc; 201 202 sc = (struct gif_softc *)arg; 203 if (sc == NULL) 204 return 0; 205 206 if ((sc->gif_if.if_flags & IFF_UP) == 0) 207 return 0; 208 209 /* no physical address */ 210 if (!sc->gif_psrc || !sc->gif_pdst) 211 return 0; 212 213 switch (proto) { 214 #ifdef INET 215 case IPPROTO_IPV4: 216 break; 217 #endif 218 #ifdef INET6 219 case IPPROTO_IPV6: 220 break; 221 #endif 222 #ifdef ISO 223 case IPPROTO_EON: 224 break; 225 #endif 226 default: 227 return 0; 228 } 229 230 /* Bail on short packets */ 231 KASSERT(m->m_flags & M_PKTHDR); 232 if (m->m_pkthdr.len < sizeof(ip)) 233 return 0; 234 235 m_copydata(m, 0, sizeof(ip), (void *)&ip); 236 237 switch (ip.ip_v) { 238 #ifdef INET 239 case 4: 240 if (sc->gif_psrc->sa_family != AF_INET || 241 sc->gif_pdst->sa_family != AF_INET) 242 return 0; 243 return gif_encapcheck4(m, off, proto, arg); 244 #endif 245 #ifdef INET6 246 case 6: 247 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) 248 return 0; 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 #endif 259 260 int 261 gif_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 262 struct rtentry *rt) 263 { 264 struct gif_softc *sc = (struct gif_softc*)ifp; 265 int error = 0; 266 static int called = 0; /* XXX: MUTEX */ 267 ALTQ_DECL(struct altq_pktattr pktattr;) 268 int s; 269 270 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 271 272 /* 273 * gif may cause infinite recursion calls when misconfigured. 274 * We'll prevent this by introducing upper limit. 275 * XXX: this mechanism may introduce another problem about 276 * mutual exclusion of the variable CALLED, especially if we 277 * use kernel thread. 278 */ 279 if (++called > max_gif_nesting) { 280 log(LOG_NOTICE, 281 "gif_output: recursively called too many times(%d)\n", 282 called); 283 m_freem(m); 284 error = EIO; /* is there better errno? */ 285 goto end; 286 } 287 288 m->m_flags &= ~(M_BCAST|M_MCAST); 289 if (!(ifp->if_flags & IFF_UP) || 290 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 291 m_freem(m); 292 error = ENETDOWN; 293 goto end; 294 } 295 296 /* inner AF-specific encapsulation */ 297 switch (dst->sa_family) { 298 #ifdef ISO 299 case AF_ISO: 300 m = gif_eon_encap(m); 301 if (!m) { 302 error = ENOBUFS; 303 goto end; 304 } 305 break; 306 #endif 307 default: 308 break; 309 } 310 311 /* XXX should we check if our outer source is legal? */ 312 313 /* use DLT_NULL encapsulation here to pass inner af type */ 314 M_PREPEND(m, sizeof(int), M_DONTWAIT); 315 if (!m) { 316 error = ENOBUFS; 317 goto end; 318 } 319 *mtod(m, int *) = dst->sa_family; 320 321 s = splnet(); 322 IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error); 323 if (error) { 324 splx(s); 325 goto end; 326 } 327 splx(s); 328 329 softint_schedule(sc->gif_si); 330 error = 0; 331 332 end: 333 called = 0; /* reset recursion counter */ 334 if (error) 335 ifp->if_oerrors++; 336 return error; 337 } 338 339 static void 340 gifintr(void *arg) 341 { 342 struct gif_softc *sc; 343 struct ifnet *ifp; 344 struct mbuf *m; 345 int family; 346 int len; 347 int s; 348 int error; 349 350 sc = (struct gif_softc *)arg; 351 ifp = &sc->gif_if; 352 353 /* output processing */ 354 while (1) { 355 s = splnet(); 356 IFQ_DEQUEUE(&sc->gif_if.if_snd, m); 357 splx(s); 358 if (m == NULL) 359 break; 360 361 /* grab and chop off inner af type */ 362 if (sizeof(int) > m->m_len) { 363 m = m_pullup(m, sizeof(int)); 364 if (!m) { 365 ifp->if_oerrors++; 366 continue; 367 } 368 } 369 family = *mtod(m, int *); 370 #if NBPFILTER > 0 371 if (ifp->if_bpf) 372 bpf_mtap(ifp->if_bpf, m); 373 #endif 374 m_adj(m, sizeof(int)); 375 376 len = m->m_pkthdr.len; 377 378 /* dispatch to output logic based on outer AF */ 379 switch (sc->gif_psrc->sa_family) { 380 #ifdef INET 381 case AF_INET: 382 error = in_gif_output(ifp, family, m); 383 break; 384 #endif 385 #ifdef INET6 386 case AF_INET6: 387 error = in6_gif_output(ifp, family, m); 388 break; 389 #endif 390 default: 391 m_freem(m); 392 error = ENETDOWN; 393 break; 394 } 395 396 if (error) 397 ifp->if_oerrors++; 398 else { 399 ifp->if_opackets++; 400 ifp->if_obytes += len; 401 } 402 } 403 } 404 405 void 406 gif_input(struct mbuf *m, int af, struct ifnet *ifp) 407 { 408 int s, isr; 409 struct ifqueue *ifq = NULL; 410 411 if (ifp == NULL) { 412 /* just in case */ 413 m_freem(m); 414 return; 415 } 416 417 m->m_pkthdr.rcvif = ifp; 418 419 #if NBPFILTER > 0 420 if (ifp->if_bpf) 421 bpf_mtap_af(ifp->if_bpf, af, m); 422 #endif /*NBPFILTER > 0*/ 423 424 /* 425 * Put the packet to the network layer input queue according to the 426 * specified address family. 427 * Note: older versions of gif_input directly called network layer 428 * input functions, e.g. ip6_input, here. We changed the policy to 429 * prevent too many recursive calls of such input functions, which 430 * might cause kernel panic. But the change may introduce another 431 * problem; if the input queue is full, packets are discarded. 432 * The kernel stack overflow really happened, and we believed 433 * queue-full rarely occurs, so we changed the policy. 434 */ 435 switch (af) { 436 #ifdef INET 437 case AF_INET: 438 ifq = &ipintrq; 439 isr = NETISR_IP; 440 break; 441 #endif 442 #ifdef INET6 443 case AF_INET6: 444 ifq = &ip6intrq; 445 isr = NETISR_IPV6; 446 break; 447 #endif 448 #ifdef ISO 449 case AF_ISO: 450 m = gif_eon_decap(ifp, m); 451 if (!m) 452 return; 453 ifq = &clnlintrq; 454 isr = NETISR_ISO; 455 break; 456 #endif 457 default: 458 m_freem(m); 459 return; 460 } 461 462 s = splnet(); 463 if (IF_QFULL(ifq)) { 464 IF_DROP(ifq); /* update statistics */ 465 m_freem(m); 466 splx(s); 467 return; 468 } 469 ifp->if_ipackets++; 470 ifp->if_ibytes += m->m_pkthdr.len; 471 IF_ENQUEUE(ifq, m); 472 /* we need schednetisr since the address family may change */ 473 schednetisr(isr); 474 splx(s); 475 } 476 477 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 478 int 479 gif_ioctl(struct ifnet *ifp, u_long cmd, void *data) 480 { 481 struct lwp *l = curlwp; /* XXX */ 482 struct gif_softc *sc = (struct gif_softc*)ifp; 483 struct ifreq *ifr = (struct ifreq*)data; 484 int error = 0, size; 485 struct sockaddr *dst, *src; 486 #ifdef SIOCSIFMTU 487 u_long mtu; 488 #endif 489 490 switch (cmd) { 491 case SIOCSIFMTU: 492 case SIOCSLIFPHYADDR: 493 #ifdef SIOCDIFPHYADDR 494 case SIOCDIFPHYADDR: 495 #endif 496 if ((error = kauth_authorize_network(l->l_cred, 497 KAUTH_NETWORK_INTERFACE, 498 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 499 NULL)) != 0) 500 return (error); 501 /* FALLTHROUGH */ 502 default: 503 break; 504 } 505 506 switch (cmd) { 507 case SIOCSIFADDR: 508 ifp->if_flags |= IFF_UP; 509 break; 510 511 case SIOCSIFDSTADDR: 512 break; 513 514 case SIOCADDMULTI: 515 case SIOCDELMULTI: 516 switch (ifr->ifr_addr.sa_family) { 517 #ifdef INET 518 case AF_INET: /* IP supports Multicast */ 519 break; 520 #endif /* INET */ 521 #ifdef INET6 522 case AF_INET6: /* IP6 supports Multicast */ 523 break; 524 #endif /* INET6 */ 525 default: /* Other protocols doesn't support Multicast */ 526 error = EAFNOSUPPORT; 527 break; 528 } 529 break; 530 531 #ifdef SIOCSIFMTU /* xxx */ 532 case SIOCGIFMTU: 533 break; 534 535 case SIOCSIFMTU: 536 mtu = ifr->ifr_mtu; 537 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) 538 return (EINVAL); 539 ifp->if_mtu = mtu; 540 break; 541 #endif /* SIOCSIFMTU */ 542 543 #ifdef INET 544 case SIOCSIFPHYADDR: 545 #endif 546 #ifdef INET6 547 case SIOCSIFPHYADDR_IN6: 548 #endif /* INET6 */ 549 case SIOCSLIFPHYADDR: 550 switch (cmd) { 551 #ifdef INET 552 case SIOCSIFPHYADDR: 553 src = (struct sockaddr *) 554 &(((struct in_aliasreq *)data)->ifra_addr); 555 dst = (struct sockaddr *) 556 &(((struct in_aliasreq *)data)->ifra_dstaddr); 557 break; 558 #endif 559 #ifdef INET6 560 case SIOCSIFPHYADDR_IN6: 561 src = (struct sockaddr *) 562 &(((struct in6_aliasreq *)data)->ifra_addr); 563 dst = (struct sockaddr *) 564 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 565 break; 566 #endif 567 case SIOCSLIFPHYADDR: 568 src = (struct sockaddr *) 569 &(((struct if_laddrreq *)data)->addr); 570 dst = (struct sockaddr *) 571 &(((struct if_laddrreq *)data)->dstaddr); 572 break; 573 default: 574 return EINVAL; 575 } 576 577 /* sa_family must be equal */ 578 if (src->sa_family != dst->sa_family) 579 return EINVAL; 580 581 /* validate sa_len */ 582 switch (src->sa_family) { 583 #ifdef INET 584 case AF_INET: 585 if (src->sa_len != sizeof(struct sockaddr_in)) 586 return EINVAL; 587 break; 588 #endif 589 #ifdef INET6 590 case AF_INET6: 591 if (src->sa_len != sizeof(struct sockaddr_in6)) 592 return EINVAL; 593 break; 594 #endif 595 default: 596 return EAFNOSUPPORT; 597 } 598 switch (dst->sa_family) { 599 #ifdef INET 600 case AF_INET: 601 if (dst->sa_len != sizeof(struct sockaddr_in)) 602 return EINVAL; 603 break; 604 #endif 605 #ifdef INET6 606 case AF_INET6: 607 if (dst->sa_len != sizeof(struct sockaddr_in6)) 608 return EINVAL; 609 break; 610 #endif 611 default: 612 return EAFNOSUPPORT; 613 } 614 615 /* check sa_family looks sane for the cmd */ 616 switch (cmd) { 617 case SIOCSIFPHYADDR: 618 if (src->sa_family == AF_INET) 619 break; 620 return EAFNOSUPPORT; 621 #ifdef INET6 622 case SIOCSIFPHYADDR_IN6: 623 if (src->sa_family == AF_INET6) 624 break; 625 return EAFNOSUPPORT; 626 #endif /* INET6 */ 627 case SIOCSLIFPHYADDR: 628 /* checks done in the above */ 629 break; 630 } 631 632 error = gif_set_tunnel(&sc->gif_if, src, dst); 633 break; 634 635 #ifdef SIOCDIFPHYADDR 636 case SIOCDIFPHYADDR: 637 gif_delete_tunnel(&sc->gif_if); 638 break; 639 #endif 640 641 case SIOCGIFPSRCADDR: 642 #ifdef INET6 643 case SIOCGIFPSRCADDR_IN6: 644 #endif /* INET6 */ 645 if (sc->gif_psrc == NULL) { 646 error = EADDRNOTAVAIL; 647 goto bad; 648 } 649 src = sc->gif_psrc; 650 switch (cmd) { 651 #ifdef INET 652 case SIOCGIFPSRCADDR: 653 dst = &ifr->ifr_addr; 654 size = sizeof(ifr->ifr_addr); 655 break; 656 #endif /* INET */ 657 #ifdef INET6 658 case SIOCGIFPSRCADDR_IN6: 659 dst = (struct sockaddr *) 660 &(((struct in6_ifreq *)data)->ifr_addr); 661 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 662 break; 663 #endif /* INET6 */ 664 default: 665 error = EADDRNOTAVAIL; 666 goto bad; 667 } 668 if (src->sa_len > size) 669 return EINVAL; 670 memcpy(dst, src, src->sa_len); 671 break; 672 673 case SIOCGIFPDSTADDR: 674 #ifdef INET6 675 case SIOCGIFPDSTADDR_IN6: 676 #endif /* INET6 */ 677 if (sc->gif_pdst == NULL) { 678 error = EADDRNOTAVAIL; 679 goto bad; 680 } 681 src = sc->gif_pdst; 682 switch (cmd) { 683 #ifdef INET 684 case SIOCGIFPDSTADDR: 685 dst = &ifr->ifr_addr; 686 size = sizeof(ifr->ifr_addr); 687 break; 688 #endif /* INET */ 689 #ifdef INET6 690 case SIOCGIFPDSTADDR_IN6: 691 dst = (struct sockaddr *) 692 &(((struct in6_ifreq *)data)->ifr_addr); 693 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 694 break; 695 #endif /* INET6 */ 696 default: 697 error = EADDRNOTAVAIL; 698 goto bad; 699 } 700 if (src->sa_len > size) 701 return EINVAL; 702 memcpy(dst, src, src->sa_len); 703 break; 704 705 case SIOCGLIFPHYADDR: 706 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 707 error = EADDRNOTAVAIL; 708 goto bad; 709 } 710 711 /* copy src */ 712 src = sc->gif_psrc; 713 dst = (struct sockaddr *) 714 &(((struct if_laddrreq *)data)->addr); 715 size = sizeof(((struct if_laddrreq *)data)->addr); 716 if (src->sa_len > size) 717 return EINVAL; 718 memcpy(dst, src, src->sa_len); 719 720 /* copy dst */ 721 src = sc->gif_pdst; 722 dst = (struct sockaddr *) 723 &(((struct if_laddrreq *)data)->dstaddr); 724 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 725 if (src->sa_len > size) 726 return EINVAL; 727 memcpy(dst, src, src->sa_len); 728 break; 729 730 case SIOCSIFFLAGS: 731 /* if_ioctl() takes care of it */ 732 break; 733 734 default: 735 error = EINVAL; 736 break; 737 } 738 bad: 739 return error; 740 } 741 742 int 743 gif_set_tunnel(struct ifnet *ifp, struct sockaddr *src, struct sockaddr *dst) 744 { 745 struct gif_softc *sc = (struct gif_softc *)ifp; 746 struct gif_softc *sc2; 747 struct sockaddr *osrc, *odst; 748 int s; 749 int error; 750 751 s = splsoftnet(); 752 753 LIST_FOREACH(sc2, &gif_softc_list, gif_list) { 754 if (sc2 == sc) 755 continue; 756 if (!sc2->gif_pdst || !sc2->gif_psrc) 757 continue; 758 /* can't configure same pair of address onto two gifs */ 759 if (sockaddr_cmp(sc2->gif_pdst, dst) == 0 && 760 sockaddr_cmp(sc2->gif_psrc, src) == 0) { 761 error = EADDRNOTAVAIL; 762 goto bad; 763 } 764 765 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 766 } 767 768 if (sc->gif_si) { 769 softint_disestablish(sc->gif_si); 770 sc->gif_si = NULL; 771 } 772 773 /* XXX we can detach from both, but be polite just in case */ 774 if (sc->gif_psrc) 775 switch (sc->gif_psrc->sa_family) { 776 #ifdef INET 777 case AF_INET: 778 (void)in_gif_detach(sc); 779 break; 780 #endif 781 #ifdef INET6 782 case AF_INET6: 783 (void)in6_gif_detach(sc); 784 break; 785 #endif 786 } 787 788 sc->gif_si = softint_establish(SOFTINT_NET, gifintr, sc); 789 if (sc->gif_si == NULL) { 790 error = ENOMEM; 791 goto bad; 792 } 793 794 osrc = sc->gif_psrc; 795 sc->gif_psrc = sockaddr_dup(src, M_WAITOK); 796 797 odst = sc->gif_pdst; 798 sc->gif_pdst = sockaddr_dup(dst, M_WAITOK); 799 800 switch (sc->gif_psrc->sa_family) { 801 #ifdef INET 802 case AF_INET: 803 error = in_gif_attach(sc); 804 break; 805 #endif 806 #ifdef INET6 807 case AF_INET6: 808 error = in6_gif_attach(sc); 809 break; 810 #endif 811 default: 812 error = EINVAL; 813 break; 814 } 815 if (error) { 816 /* rollback */ 817 sockaddr_free(sc->gif_psrc); 818 sockaddr_free(sc->gif_pdst); 819 sc->gif_psrc = osrc; 820 sc->gif_pdst = odst; 821 goto bad; 822 } 823 824 if (osrc) 825 sockaddr_free(osrc); 826 if (odst) 827 sockaddr_free(odst); 828 829 if (sc->gif_psrc && sc->gif_pdst) 830 ifp->if_flags |= IFF_RUNNING; 831 else 832 ifp->if_flags &= ~IFF_RUNNING; 833 splx(s); 834 835 return 0; 836 837 bad: 838 if (sc->gif_si) { 839 softint_disestablish(sc->gif_si); 840 sc->gif_si = NULL; 841 } 842 if (sc->gif_psrc && sc->gif_pdst) 843 ifp->if_flags |= IFF_RUNNING; 844 else 845 ifp->if_flags &= ~IFF_RUNNING; 846 splx(s); 847 848 return error; 849 } 850 851 void 852 gif_delete_tunnel(struct ifnet *ifp) 853 { 854 struct gif_softc *sc = (struct gif_softc *)ifp; 855 int s; 856 857 s = splsoftnet(); 858 859 if (sc->gif_si) { 860 softint_disestablish(sc->gif_si); 861 sc->gif_si = NULL; 862 } 863 if (sc->gif_psrc) { 864 sockaddr_free(sc->gif_psrc); 865 sc->gif_psrc = NULL; 866 } 867 if (sc->gif_pdst) { 868 sockaddr_free(sc->gif_pdst); 869 sc->gif_pdst = NULL; 870 } 871 /* it is safe to detach from both */ 872 #ifdef INET 873 (void)in_gif_detach(sc); 874 #endif 875 #ifdef INET6 876 (void)in6_gif_detach(sc); 877 #endif 878 879 if (sc->gif_psrc && sc->gif_pdst) 880 ifp->if_flags |= IFF_RUNNING; 881 else 882 ifp->if_flags &= ~IFF_RUNNING; 883 splx(s); 884 } 885 886 #ifdef ISO 887 struct eonhdr { 888 u_int8_t version; 889 u_int8_t class; 890 u_int16_t cksum; 891 }; 892 893 /* 894 * prepend EON header to ISO PDU 895 */ 896 static struct mbuf * 897 gif_eon_encap(struct mbuf *m) 898 { 899 struct eonhdr *ehdr; 900 901 M_PREPEND(m, sizeof(*ehdr), M_DONTWAIT); 902 if (m && m->m_len < sizeof(*ehdr)) 903 m = m_pullup(m, sizeof(*ehdr)); 904 if (m == NULL) 905 return NULL; 906 ehdr = mtod(m, struct eonhdr *); 907 ehdr->version = 1; 908 ehdr->class = 0; /* always unicast */ 909 #if 0 910 /* calculate the checksum of the eonhdr */ 911 { 912 struct mbuf mhead; 913 memset(&mhead, 0, sizeof(mhead)); 914 ehdr->cksum = 0; 915 mhead.m_data = (void *)ehdr; 916 mhead.m_len = sizeof(*ehdr); 917 mhead.m_next = 0; 918 iso_gen_csum(&mhead, offsetof(struct eonhdr, cksum), 919 mhead.m_len); 920 } 921 #else 922 /* since the data is always constant we'll just plug the value in */ 923 ehdr->cksum = htons(0xfc02); 924 #endif 925 return m; 926 } 927 928 /* 929 * remove EON header and check checksum 930 */ 931 static struct mbuf * 932 gif_eon_decap(struct ifnet *ifp, struct mbuf *m) 933 { 934 struct eonhdr *ehdr; 935 936 if (m->m_len < sizeof(*ehdr) && 937 (m = m_pullup(m, sizeof(*ehdr))) == NULL) { 938 ifp->if_ierrors++; 939 return NULL; 940 } 941 if (iso_check_csum(m, sizeof(struct eonhdr))) { 942 m_freem(m); 943 return NULL; 944 } 945 m_adj(m, sizeof(*ehdr)); 946 return m; 947 } 948 #endif /*ISO*/ 949