if_gif.c revision 1.76
1 /* $NetBSD: if_gif.c,v 1.76 2008/11/07 00:20:13 dyoung 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 1.76 2008/11/07 00:20:13 dyoung 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|M_ZERO); 138 139 if_initname(&sc->gif_if, ifc->ifc_name, unit); 140 141 gifattach0(sc); 142 143 LIST_INSERT_HEAD(&gif_softc_list, sc, gif_list); 144 return (0); 145 } 146 147 void 148 gifattach0(struct gif_softc *sc) 149 { 150 151 sc->encap_cookie4 = sc->encap_cookie6 = NULL; 152 153 sc->gif_if.if_addrlen = 0; 154 sc->gif_if.if_mtu = GIF_MTU; 155 sc->gif_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 156 sc->gif_if.if_ioctl = gif_ioctl; 157 sc->gif_if.if_output = gif_output; 158 sc->gif_if.if_type = IFT_GIF; 159 sc->gif_if.if_dlt = DLT_NULL; 160 sc->gif_if.if_softc = sc; 161 IFQ_SET_READY(&sc->gif_if.if_snd); 162 if_attach(&sc->gif_if); 163 if_alloc_sadl(&sc->gif_if); 164 #if NBPFILTER > 0 165 bpfattach(&sc->gif_if, DLT_NULL, sizeof(u_int)); 166 #endif 167 } 168 169 static int 170 gif_clone_destroy(struct ifnet *ifp) 171 { 172 struct gif_softc *sc = (void *) ifp; 173 174 gif_delete_tunnel(&sc->gif_if); 175 LIST_REMOVE(sc, gif_list); 176 #ifdef INET6 177 encap_detach(sc->encap_cookie6); 178 #endif 179 #ifdef INET 180 encap_detach(sc->encap_cookie4); 181 #endif 182 183 #if NBPFILTER > 0 184 bpfdetach(ifp); 185 #endif 186 if_detach(ifp); 187 rtcache_free(&sc->gif_ro); 188 189 free(sc, M_DEVBUF); 190 191 return (0); 192 } 193 194 #ifdef GIF_ENCAPCHECK 195 int 196 gif_encapcheck(struct mbuf *m, int off, int proto, void *arg) 197 { 198 struct ip ip; 199 struct gif_softc *sc; 200 201 sc = arg; 202 if (sc == NULL) 203 return 0; 204 205 if ((sc->gif_if.if_flags & IFF_UP) == 0) 206 return 0; 207 208 /* no physical address */ 209 if (!sc->gif_psrc || !sc->gif_pdst) 210 return 0; 211 212 switch (proto) { 213 #ifdef INET 214 case IPPROTO_IPV4: 215 break; 216 #endif 217 #ifdef INET6 218 case IPPROTO_IPV6: 219 break; 220 #endif 221 #ifdef ISO 222 case IPPROTO_EON: 223 break; 224 #endif 225 default: 226 return 0; 227 } 228 229 /* Bail on short packets */ 230 KASSERT(m->m_flags & M_PKTHDR); 231 if (m->m_pkthdr.len < sizeof(ip)) 232 return 0; 233 234 m_copydata(m, 0, sizeof(ip), &ip); 235 236 switch (ip.ip_v) { 237 #ifdef INET 238 case 4: 239 if (sc->gif_psrc->sa_family != AF_INET || 240 sc->gif_pdst->sa_family != AF_INET) 241 return 0; 242 return gif_encapcheck4(m, off, proto, arg); 243 #endif 244 #ifdef INET6 245 case 6: 246 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) 247 return 0; 248 if (sc->gif_psrc->sa_family != AF_INET6 || 249 sc->gif_pdst->sa_family != AF_INET6) 250 return 0; 251 return gif_encapcheck6(m, off, proto, arg); 252 #endif 253 default: 254 return 0; 255 } 256 } 257 #endif 258 259 int 260 gif_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 261 struct rtentry *rt) 262 { 263 struct gif_softc *sc = ifp->if_softc; 264 int error = 0; 265 static int called = 0; /* XXX: MUTEX */ 266 ALTQ_DECL(struct altq_pktattr pktattr;) 267 int s; 268 269 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 270 271 /* 272 * gif may cause infinite recursion calls when misconfigured. 273 * We'll prevent this by introducing upper limit. 274 * XXX: this mechanism may introduce another problem about 275 * mutual exclusion of the variable CALLED, especially if we 276 * use kernel thread. 277 */ 278 if (++called > max_gif_nesting) { 279 log(LOG_NOTICE, 280 "gif_output: recursively called too many times(%d)\n", 281 called); 282 m_freem(m); 283 error = EIO; /* is there better errno? */ 284 goto end; 285 } 286 287 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 /* inner AF-specific encapsulation */ 296 switch (dst->sa_family) { 297 #ifdef ISO 298 case AF_ISO: 299 m = gif_eon_encap(m); 300 if (!m) { 301 error = ENOBUFS; 302 goto end; 303 } 304 break; 305 #endif 306 default: 307 break; 308 } 309 310 /* XXX should we check if our outer source is legal? */ 311 312 /* use DLT_NULL encapsulation here to pass inner af type */ 313 M_PREPEND(m, sizeof(int), M_DONTWAIT); 314 if (!m) { 315 error = ENOBUFS; 316 goto end; 317 } 318 *mtod(m, int *) = dst->sa_family; 319 320 s = splnet(); 321 IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error); 322 if (error) { 323 splx(s); 324 goto end; 325 } 326 splx(s); 327 328 softint_schedule(sc->gif_si); 329 error = 0; 330 331 end: 332 called = 0; /* reset recursion counter */ 333 if (error) 334 ifp->if_oerrors++; 335 return error; 336 } 337 338 static void 339 gifintr(void *arg) 340 { 341 struct gif_softc *sc; 342 struct ifnet *ifp; 343 struct mbuf *m; 344 int family; 345 int len; 346 int s; 347 int error; 348 349 sc = arg; 350 ifp = &sc->gif_if; 351 352 /* output processing */ 353 while (1) { 354 s = splnet(); 355 IFQ_DEQUEUE(&sc->gif_if.if_snd, m); 356 splx(s); 357 if (m == NULL) 358 break; 359 360 /* grab and chop off inner af type */ 361 if (sizeof(int) > m->m_len) { 362 m = m_pullup(m, sizeof(int)); 363 if (!m) { 364 ifp->if_oerrors++; 365 continue; 366 } 367 } 368 family = *mtod(m, int *); 369 #if NBPFILTER > 0 370 if (ifp->if_bpf) 371 bpf_mtap(ifp->if_bpf, m); 372 #endif 373 m_adj(m, sizeof(int)); 374 375 len = m->m_pkthdr.len; 376 377 /* dispatch to output logic based on outer AF */ 378 switch (sc->gif_psrc->sa_family) { 379 #ifdef INET 380 case AF_INET: 381 error = in_gif_output(ifp, family, m); 382 break; 383 #endif 384 #ifdef INET6 385 case AF_INET6: 386 error = in6_gif_output(ifp, family, m); 387 break; 388 #endif 389 default: 390 m_freem(m); 391 error = ENETDOWN; 392 break; 393 } 394 395 if (error) 396 ifp->if_oerrors++; 397 else { 398 ifp->if_opackets++; 399 ifp->if_obytes += len; 400 } 401 } 402 } 403 404 void 405 gif_input(struct mbuf *m, int af, struct ifnet *ifp) 406 { 407 int s, isr; 408 struct ifqueue *ifq = NULL; 409 410 if (ifp == NULL) { 411 /* just in case */ 412 m_freem(m); 413 return; 414 } 415 416 m->m_pkthdr.rcvif = ifp; 417 418 #if NBPFILTER > 0 419 if (ifp->if_bpf) 420 bpf_mtap_af(ifp->if_bpf, af, m); 421 #endif /*NBPFILTER > 0*/ 422 423 /* 424 * Put the packet to the network layer input queue according to the 425 * specified address family. 426 * Note: older versions of gif_input directly called network layer 427 * input functions, e.g. ip6_input, here. We changed the policy to 428 * prevent too many recursive calls of such input functions, which 429 * might cause kernel panic. But the change may introduce another 430 * problem; if the input queue is full, packets are discarded. 431 * The kernel stack overflow really happened, and we believed 432 * queue-full rarely occurs, so we changed the policy. 433 */ 434 switch (af) { 435 #ifdef INET 436 case AF_INET: 437 ifq = &ipintrq; 438 isr = NETISR_IP; 439 break; 440 #endif 441 #ifdef INET6 442 case AF_INET6: 443 ifq = &ip6intrq; 444 isr = NETISR_IPV6; 445 break; 446 #endif 447 #ifdef ISO 448 case AF_ISO: 449 m = gif_eon_decap(ifp, m); 450 if (!m) 451 return; 452 ifq = &clnlintrq; 453 isr = NETISR_ISO; 454 break; 455 #endif 456 default: 457 m_freem(m); 458 return; 459 } 460 461 s = splnet(); 462 if (IF_QFULL(ifq)) { 463 IF_DROP(ifq); /* update statistics */ 464 m_freem(m); 465 splx(s); 466 return; 467 } 468 ifp->if_ipackets++; 469 ifp->if_ibytes += m->m_pkthdr.len; 470 IF_ENQUEUE(ifq, m); 471 /* we need schednetisr since the address family may change */ 472 schednetisr(isr); 473 splx(s); 474 } 475 476 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 477 int 478 gif_ioctl(struct ifnet *ifp, u_long cmd, void *data) 479 { 480 struct lwp *l = curlwp; /* XXX */ 481 struct gif_softc *sc = ifp->if_softc; 482 struct ifreq *ifr = (struct ifreq*)data; 483 int error = 0, size; 484 struct sockaddr *dst, *src; 485 486 switch (cmd) { 487 case SIOCSIFMTU: 488 case SIOCSLIFPHYADDR: 489 #ifdef SIOCDIFPHYADDR 490 case SIOCDIFPHYADDR: 491 #endif 492 if ((error = kauth_authorize_network(l->l_cred, 493 KAUTH_NETWORK_INTERFACE, 494 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 495 NULL)) != 0) 496 return (error); 497 /* FALLTHROUGH */ 498 default: 499 break; 500 } 501 502 switch (cmd) { 503 case SIOCINITIFADDR: 504 ifp->if_flags |= IFF_UP; 505 break; 506 507 case SIOCSIFDSTADDR: 508 break; 509 510 case SIOCADDMULTI: 511 case SIOCDELMULTI: 512 switch (ifr->ifr_addr.sa_family) { 513 #ifdef INET 514 case AF_INET: /* IP supports Multicast */ 515 break; 516 #endif /* INET */ 517 #ifdef INET6 518 case AF_INET6: /* IP6 supports Multicast */ 519 break; 520 #endif /* INET6 */ 521 default: /* Other protocols doesn't support Multicast */ 522 error = EAFNOSUPPORT; 523 break; 524 } 525 break; 526 527 case SIOCGIFMTU: 528 break; 529 530 case SIOCSIFMTU: 531 if (ifr->ifr_mtu < GIF_MTU_MIN || ifr->ifr_mtu > GIF_MTU_MAX) 532 return EINVAL; 533 else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 534 error = 0; 535 break; 536 537 #ifdef INET 538 case SIOCSIFPHYADDR: 539 #endif 540 #ifdef INET6 541 case SIOCSIFPHYADDR_IN6: 542 #endif /* INET6 */ 543 case SIOCSLIFPHYADDR: 544 switch (cmd) { 545 #ifdef INET 546 case SIOCSIFPHYADDR: 547 src = (struct sockaddr *) 548 &(((struct in_aliasreq *)data)->ifra_addr); 549 dst = (struct sockaddr *) 550 &(((struct in_aliasreq *)data)->ifra_dstaddr); 551 break; 552 #endif 553 #ifdef INET6 554 case SIOCSIFPHYADDR_IN6: 555 src = (struct sockaddr *) 556 &(((struct in6_aliasreq *)data)->ifra_addr); 557 dst = (struct sockaddr *) 558 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 559 break; 560 #endif 561 case SIOCSLIFPHYADDR: 562 src = (struct sockaddr *) 563 &(((struct if_laddrreq *)data)->addr); 564 dst = (struct sockaddr *) 565 &(((struct if_laddrreq *)data)->dstaddr); 566 break; 567 default: 568 return EINVAL; 569 } 570 571 /* sa_family must be equal */ 572 if (src->sa_family != dst->sa_family) 573 return EINVAL; 574 575 /* validate sa_len */ 576 switch (src->sa_family) { 577 #ifdef INET 578 case AF_INET: 579 if (src->sa_len != sizeof(struct sockaddr_in)) 580 return EINVAL; 581 break; 582 #endif 583 #ifdef INET6 584 case AF_INET6: 585 if (src->sa_len != sizeof(struct sockaddr_in6)) 586 return EINVAL; 587 break; 588 #endif 589 default: 590 return EAFNOSUPPORT; 591 } 592 switch (dst->sa_family) { 593 #ifdef INET 594 case AF_INET: 595 if (dst->sa_len != sizeof(struct sockaddr_in)) 596 return EINVAL; 597 break; 598 #endif 599 #ifdef INET6 600 case AF_INET6: 601 if (dst->sa_len != sizeof(struct sockaddr_in6)) 602 return EINVAL; 603 break; 604 #endif 605 default: 606 return EAFNOSUPPORT; 607 } 608 609 /* check sa_family looks sane for the cmd */ 610 switch (cmd) { 611 case SIOCSIFPHYADDR: 612 if (src->sa_family == AF_INET) 613 break; 614 return EAFNOSUPPORT; 615 #ifdef INET6 616 case SIOCSIFPHYADDR_IN6: 617 if (src->sa_family == AF_INET6) 618 break; 619 return EAFNOSUPPORT; 620 #endif /* INET6 */ 621 case SIOCSLIFPHYADDR: 622 /* checks done in the above */ 623 break; 624 } 625 626 error = gif_set_tunnel(&sc->gif_if, src, dst); 627 break; 628 629 #ifdef SIOCDIFPHYADDR 630 case SIOCDIFPHYADDR: 631 gif_delete_tunnel(&sc->gif_if); 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 (cmd) { 645 #ifdef INET 646 case SIOCGIFPSRCADDR: 647 dst = &ifr->ifr_addr; 648 size = sizeof(ifr->ifr_addr); 649 break; 650 #endif /* INET */ 651 #ifdef INET6 652 case SIOCGIFPSRCADDR_IN6: 653 dst = (struct sockaddr *) 654 &(((struct in6_ifreq *)data)->ifr_addr); 655 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 656 break; 657 #endif /* INET6 */ 658 default: 659 error = EADDRNOTAVAIL; 660 goto bad; 661 } 662 if (src->sa_len > size) 663 return EINVAL; 664 memcpy(dst, src, src->sa_len); 665 break; 666 667 case SIOCGIFPDSTADDR: 668 #ifdef INET6 669 case SIOCGIFPDSTADDR_IN6: 670 #endif /* INET6 */ 671 if (sc->gif_pdst == NULL) { 672 error = EADDRNOTAVAIL; 673 goto bad; 674 } 675 src = sc->gif_pdst; 676 switch (cmd) { 677 #ifdef INET 678 case SIOCGIFPDSTADDR: 679 dst = &ifr->ifr_addr; 680 size = sizeof(ifr->ifr_addr); 681 break; 682 #endif /* INET */ 683 #ifdef INET6 684 case SIOCGIFPDSTADDR_IN6: 685 dst = (struct sockaddr *) 686 &(((struct in6_ifreq *)data)->ifr_addr); 687 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 688 break; 689 #endif /* INET6 */ 690 default: 691 error = EADDRNOTAVAIL; 692 goto bad; 693 } 694 if (src->sa_len > size) 695 return EINVAL; 696 memcpy(dst, src, src->sa_len); 697 break; 698 699 case SIOCGLIFPHYADDR: 700 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 701 error = EADDRNOTAVAIL; 702 goto bad; 703 } 704 705 /* copy src */ 706 src = sc->gif_psrc; 707 dst = (struct sockaddr *) 708 &(((struct if_laddrreq *)data)->addr); 709 size = sizeof(((struct if_laddrreq *)data)->addr); 710 if (src->sa_len > size) 711 return EINVAL; 712 memcpy(dst, src, src->sa_len); 713 714 /* copy dst */ 715 src = sc->gif_pdst; 716 dst = (struct sockaddr *) 717 &(((struct if_laddrreq *)data)->dstaddr); 718 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 719 if (src->sa_len > size) 720 return EINVAL; 721 memcpy(dst, src, src->sa_len); 722 break; 723 724 default: 725 return ifioctl_common(ifp, cmd, data); 726 } 727 bad: 728 return error; 729 } 730 731 int 732 gif_set_tunnel(struct ifnet *ifp, struct sockaddr *src, struct sockaddr *dst) 733 { 734 struct gif_softc *sc = ifp->if_softc; 735 struct gif_softc *sc2; 736 struct sockaddr *osrc, *odst; 737 int s; 738 int error; 739 740 s = splsoftnet(); 741 742 LIST_FOREACH(sc2, &gif_softc_list, gif_list) { 743 if (sc2 == sc) 744 continue; 745 if (!sc2->gif_pdst || !sc2->gif_psrc) 746 continue; 747 /* can't configure same pair of address onto two gifs */ 748 if (sockaddr_cmp(sc2->gif_pdst, dst) == 0 && 749 sockaddr_cmp(sc2->gif_psrc, src) == 0) { 750 error = EADDRNOTAVAIL; 751 goto bad; 752 } 753 754 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 755 } 756 757 if (sc->gif_si) { 758 softint_disestablish(sc->gif_si); 759 sc->gif_si = NULL; 760 } 761 762 /* XXX we can detach from both, but be polite just in case */ 763 if (sc->gif_psrc) 764 switch (sc->gif_psrc->sa_family) { 765 #ifdef INET 766 case AF_INET: 767 (void)in_gif_detach(sc); 768 break; 769 #endif 770 #ifdef INET6 771 case AF_INET6: 772 (void)in6_gif_detach(sc); 773 break; 774 #endif 775 } 776 777 sc->gif_si = softint_establish(SOFTINT_NET, gifintr, sc); 778 if (sc->gif_si == NULL) { 779 error = ENOMEM; 780 goto bad; 781 } 782 783 osrc = sc->gif_psrc; 784 sc->gif_psrc = sockaddr_dup(src, M_WAITOK); 785 786 odst = sc->gif_pdst; 787 sc->gif_pdst = sockaddr_dup(dst, M_WAITOK); 788 789 switch (sc->gif_psrc->sa_family) { 790 #ifdef INET 791 case AF_INET: 792 error = in_gif_attach(sc); 793 break; 794 #endif 795 #ifdef INET6 796 case AF_INET6: 797 error = in6_gif_attach(sc); 798 break; 799 #endif 800 default: 801 error = EINVAL; 802 break; 803 } 804 if (error) { 805 /* rollback */ 806 sockaddr_free(sc->gif_psrc); 807 sockaddr_free(sc->gif_pdst); 808 sc->gif_psrc = osrc; 809 sc->gif_pdst = odst; 810 goto bad; 811 } 812 813 if (osrc) 814 sockaddr_free(osrc); 815 if (odst) 816 sockaddr_free(odst); 817 818 if (sc->gif_psrc && sc->gif_pdst) 819 ifp->if_flags |= IFF_RUNNING; 820 else 821 ifp->if_flags &= ~IFF_RUNNING; 822 splx(s); 823 824 return 0; 825 826 bad: 827 if (sc->gif_si) { 828 softint_disestablish(sc->gif_si); 829 sc->gif_si = NULL; 830 } 831 if (sc->gif_psrc && sc->gif_pdst) 832 ifp->if_flags |= IFF_RUNNING; 833 else 834 ifp->if_flags &= ~IFF_RUNNING; 835 splx(s); 836 837 return error; 838 } 839 840 void 841 gif_delete_tunnel(struct ifnet *ifp) 842 { 843 struct gif_softc *sc = ifp->if_softc; 844 int s; 845 846 s = splsoftnet(); 847 848 if (sc->gif_si) { 849 softint_disestablish(sc->gif_si); 850 sc->gif_si = NULL; 851 } 852 if (sc->gif_psrc) { 853 sockaddr_free(sc->gif_psrc); 854 sc->gif_psrc = NULL; 855 } 856 if (sc->gif_pdst) { 857 sockaddr_free(sc->gif_pdst); 858 sc->gif_pdst = NULL; 859 } 860 /* it is safe to detach from both */ 861 #ifdef INET 862 (void)in_gif_detach(sc); 863 #endif 864 #ifdef INET6 865 (void)in6_gif_detach(sc); 866 #endif 867 868 if (sc->gif_psrc && sc->gif_pdst) 869 ifp->if_flags |= IFF_RUNNING; 870 else 871 ifp->if_flags &= ~IFF_RUNNING; 872 splx(s); 873 } 874 875 #ifdef ISO 876 struct eonhdr { 877 uint8_t version; 878 uint8_t class; 879 uint16_t cksum; 880 }; 881 882 /* 883 * prepend EON header to ISO PDU 884 */ 885 static struct mbuf * 886 gif_eon_encap(struct mbuf *m) 887 { 888 struct eonhdr *ehdr; 889 890 M_PREPEND(m, sizeof(*ehdr), M_DONTWAIT); 891 if (m && m->m_len < sizeof(*ehdr)) 892 m = m_pullup(m, sizeof(*ehdr)); 893 if (m == NULL) 894 return NULL; 895 ehdr = mtod(m, struct eonhdr *); 896 ehdr->version = 1; 897 ehdr->class = 0; /* always unicast */ 898 #if 0 899 /* calculate the checksum of the eonhdr */ 900 { 901 struct mbuf mhead; 902 memset(&mhead, 0, sizeof(mhead)); 903 ehdr->cksum = 0; 904 mhead.m_data = (void *)ehdr; 905 mhead.m_len = sizeof(*ehdr); 906 mhead.m_next = 0; 907 iso_gen_csum(&mhead, offsetof(struct eonhdr, cksum), 908 mhead.m_len); 909 } 910 #else 911 /* since the data is always constant we'll just plug the value in */ 912 ehdr->cksum = htons(0xfc02); 913 #endif 914 return m; 915 } 916 917 /* 918 * remove EON header and check checksum 919 */ 920 static struct mbuf * 921 gif_eon_decap(struct ifnet *ifp, struct mbuf *m) 922 { 923 struct eonhdr *ehdr; 924 925 if (m->m_len < sizeof(*ehdr) && 926 (m = m_pullup(m, sizeof(*ehdr))) == NULL) { 927 ifp->if_ierrors++; 928 return NULL; 929 } 930 if (iso_check_csum(m, sizeof(struct eonhdr))) { 931 m_freem(m); 932 return NULL; 933 } 934 m_adj(m, sizeof(*ehdr)); 935 return m; 936 } 937 #endif /*ISO*/ 938
Indexes created Sat Sep 27 14:09:57 GMT 2025