if_gif.c revision 1.71
1 /* $NetBSD: if_gif.c,v 1.71 2007/09/16 18:09:51 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 1.71 2007/09/16 18:09:51 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 53 #include <machine/cpu.h> 54 #include <machine/intr.h> 55 56 #include <net/if.h> 57 #include <net/if_types.h> 58 #include <net/netisr.h> 59 #include <net/route.h> 60 #include <net/bpf.h> 61 62 #include <netinet/in.h> 63 #include <netinet/in_systm.h> 64 #include <netinet/ip.h> 65 #ifdef INET 66 #include <netinet/in_var.h> 67 #endif /* INET */ 68 #include <netinet/in_gif.h> 69 70 #ifdef INET6 71 #ifndef INET 72 #include <netinet/in.h> 73 #endif 74 #include <netinet6/in6_var.h> 75 #include <netinet/ip6.h> 76 #include <netinet6/ip6_var.h> 77 #include <netinet6/in6_gif.h> 78 #include <netinet6/ip6protosw.h> 79 #endif /* INET6 */ 80 81 #ifdef ISO 82 #include <netiso/iso.h> 83 #include <netiso/iso_var.h> 84 #endif 85 86 #include <netinet/ip_encap.h> 87 #include <net/if_gif.h> 88 89 #include "bpfilter.h" 90 91 #include <net/net_osdep.h> 92 93 void gifattach(int); 94 static void gifintr(void *); 95 #ifdef ISO 96 static struct mbuf *gif_eon_encap(struct mbuf *); 97 static struct mbuf *gif_eon_decap(struct ifnet *, struct mbuf *); 98 #endif 99 100 /* 101 * gif global variable definitions 102 */ 103 LIST_HEAD(, gif_softc) gif_softc_list; /* XXX should be static */ 104 105 static int gif_clone_create(struct if_clone *, int); 106 static int gif_clone_destroy(struct ifnet *); 107 108 static struct if_clone gif_cloner = 109 IF_CLONE_INITIALIZER("gif", gif_clone_create, gif_clone_destroy); 110 111 #ifndef MAX_GIF_NEST 112 /* 113 * This macro controls the upper limitation on nesting of gif tunnels. 114 * Since, setting a large value to this macro with a careless configuration 115 * may introduce system crash, we don't allow any nestings by default. 116 * If you need to configure nested gif tunnels, you can define this macro 117 * in your kernel configuration file. However, if you do so, please be 118 * careful to configure the tunnels so that it won't make a loop. 119 */ 120 #define MAX_GIF_NEST 1 121 #endif 122 static int max_gif_nesting = MAX_GIF_NEST; 123 124 /* ARGSUSED */ 125 void 126 gifattach(int count) 127 { 128 129 LIST_INIT(&gif_softc_list); 130 if_clone_attach(&gif_cloner); 131 } 132 133 static int 134 gif_clone_create(struct if_clone *ifc, int unit) 135 { 136 struct gif_softc *sc; 137 138 sc = malloc(sizeof(struct gif_softc), M_DEVBUF, M_WAITOK); 139 memset(sc, 0, sizeof(struct gif_softc)); 140 141 snprintf(sc->gif_if.if_xname, sizeof(sc->gif_if.if_xname), "%s%d", 142 ifc->ifc_name, unit); 143 144 gifattach0(sc); 145 146 LIST_INSERT_HEAD(&gif_softc_list, sc, gif_list); 147 return (0); 148 } 149 150 void 151 gifattach0(struct gif_softc *sc) 152 { 153 154 sc->encap_cookie4 = sc->encap_cookie6 = NULL; 155 156 sc->gif_if.if_addrlen = 0; 157 sc->gif_if.if_mtu = GIF_MTU; 158 sc->gif_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 159 sc->gif_if.if_ioctl = gif_ioctl; 160 sc->gif_if.if_output = gif_output; 161 sc->gif_if.if_type = IFT_GIF; 162 sc->gif_if.if_dlt = DLT_NULL; 163 IFQ_SET_READY(&sc->gif_if.if_snd); 164 if_attach(&sc->gif_if); 165 if_alloc_sadl(&sc->gif_if); 166 #if NBPFILTER > 0 167 bpfattach(&sc->gif_if, DLT_NULL, sizeof(u_int)); 168 #endif 169 } 170 171 static int 172 gif_clone_destroy(struct ifnet *ifp) 173 { 174 struct gif_softc *sc = (void *) ifp; 175 176 gif_delete_tunnel(&sc->gif_if); 177 LIST_REMOVE(sc, gif_list); 178 #ifdef INET6 179 encap_detach(sc->encap_cookie6); 180 #endif 181 #ifdef INET 182 encap_detach(sc->encap_cookie4); 183 #endif 184 185 #if NBPFILTER > 0 186 bpfdetach(ifp); 187 #endif 188 if_detach(ifp); 189 rtcache_free(&sc->gif_ro); 190 191 free(sc, M_DEVBUF); 192 193 return (0); 194 } 195 196 #ifdef GIF_ENCAPCHECK 197 int 198 gif_encapcheck(struct mbuf *m, int off, int proto, void *arg) 199 { 200 struct ip ip; 201 struct gif_softc *sc; 202 203 sc = (struct gif_softc *)arg; 204 if (sc == NULL) 205 return 0; 206 207 if ((sc->gif_if.if_flags & IFF_UP) == 0) 208 return 0; 209 210 /* no physical address */ 211 if (!sc->gif_psrc || !sc->gif_pdst) 212 return 0; 213 214 switch (proto) { 215 #ifdef INET 216 case IPPROTO_IPV4: 217 break; 218 #endif 219 #ifdef INET6 220 case IPPROTO_IPV6: 221 break; 222 #endif 223 #ifdef ISO 224 case IPPROTO_EON: 225 break; 226 #endif 227 default: 228 return 0; 229 } 230 231 /* Bail on short packets */ 232 KASSERT(m->m_flags & M_PKTHDR); 233 if (m->m_pkthdr.len < sizeof(ip)) 234 return 0; 235 236 m_copydata(m, 0, sizeof(ip), (void *)&ip); 237 238 switch (ip.ip_v) { 239 #ifdef INET 240 case 4: 241 if (sc->gif_psrc->sa_family != AF_INET || 242 sc->gif_pdst->sa_family != AF_INET) 243 return 0; 244 return gif_encapcheck4(m, off, proto, arg); 245 #endif 246 #ifdef INET6 247 case 6: 248 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) 249 return 0; 250 if (sc->gif_psrc->sa_family != AF_INET6 || 251 sc->gif_pdst->sa_family != AF_INET6) 252 return 0; 253 return gif_encapcheck6(m, off, proto, arg); 254 #endif 255 default: 256 return 0; 257 } 258 } 259 #endif 260 261 int 262 gif_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 263 struct rtentry *rt) 264 { 265 struct gif_softc *sc = (struct gif_softc*)ifp; 266 int error = 0; 267 static int called = 0; /* XXX: MUTEX */ 268 ALTQ_DECL(struct altq_pktattr pktattr;) 269 int s; 270 271 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 272 273 /* 274 * gif may cause infinite recursion calls when misconfigured. 275 * We'll prevent this by introducing upper limit. 276 * XXX: this mechanism may introduce another problem about 277 * mutual exclusion of the variable CALLED, especially if we 278 * use kernel thread. 279 */ 280 if (++called > max_gif_nesting) { 281 log(LOG_NOTICE, 282 "gif_output: recursively called too many times(%d)\n", 283 called); 284 m_freem(m); 285 error = EIO; /* is there better errno? */ 286 goto end; 287 } 288 289 m->m_flags &= ~(M_BCAST|M_MCAST); 290 if (!(ifp->if_flags & IFF_UP) || 291 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 292 m_freem(m); 293 error = ENETDOWN; 294 goto end; 295 } 296 297 /* inner AF-specific encapsulation */ 298 switch (dst->sa_family) { 299 #ifdef ISO 300 case AF_ISO: 301 m = gif_eon_encap(m); 302 if (!m) { 303 error = ENOBUFS; 304 goto end; 305 } 306 break; 307 #endif 308 default: 309 break; 310 } 311 312 /* XXX should we check if our outer source is legal? */ 313 314 /* use DLT_NULL encapsulation here to pass inner af type */ 315 M_PREPEND(m, sizeof(int), M_DONTWAIT); 316 if (!m) { 317 error = ENOBUFS; 318 goto end; 319 } 320 *mtod(m, int *) = dst->sa_family; 321 322 s = splnet(); 323 IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error); 324 if (error) { 325 splx(s); 326 goto end; 327 } 328 splx(s); 329 330 softintr_schedule(sc->gif_si); 331 error = 0; 332 333 end: 334 called = 0; /* reset recursion counter */ 335 if (error) 336 ifp->if_oerrors++; 337 return error; 338 } 339 340 static void 341 gifintr(void *arg) 342 { 343 struct gif_softc *sc; 344 struct ifnet *ifp; 345 struct mbuf *m; 346 int family; 347 int len; 348 int s; 349 int error; 350 351 sc = (struct gif_softc *)arg; 352 ifp = &sc->gif_if; 353 354 /* output processing */ 355 while (1) { 356 s = splnet(); 357 IFQ_DEQUEUE(&sc->gif_if.if_snd, m); 358 splx(s); 359 if (m == NULL) 360 break; 361 362 /* grab and chop off inner af type */ 363 if (sizeof(int) > m->m_len) { 364 m = m_pullup(m, sizeof(int)); 365 if (!m) { 366 ifp->if_oerrors++; 367 continue; 368 } 369 } 370 family = *mtod(m, int *); 371 #if NBPFILTER > 0 372 if (ifp->if_bpf) 373 bpf_mtap(ifp->if_bpf, m); 374 #endif 375 m_adj(m, sizeof(int)); 376 377 len = m->m_pkthdr.len; 378 379 /* dispatch to output logic based on outer AF */ 380 switch (sc->gif_psrc->sa_family) { 381 #ifdef INET 382 case AF_INET: 383 error = in_gif_output(ifp, family, m); 384 break; 385 #endif 386 #ifdef INET6 387 case AF_INET6: 388 error = in6_gif_output(ifp, family, m); 389 break; 390 #endif 391 default: 392 m_freem(m); 393 error = ENETDOWN; 394 break; 395 } 396 397 if (error) 398 ifp->if_oerrors++; 399 else { 400 ifp->if_opackets++; 401 ifp->if_obytes += len; 402 } 403 } 404 } 405 406 void 407 gif_input(struct mbuf *m, int af, struct ifnet *ifp) 408 { 409 int s, isr; 410 struct ifqueue *ifq = NULL; 411 412 if (ifp == NULL) { 413 /* just in case */ 414 m_freem(m); 415 return; 416 } 417 418 m->m_pkthdr.rcvif = ifp; 419 420 #if NBPFILTER > 0 421 if (ifp->if_bpf) 422 bpf_mtap_af(ifp->if_bpf, af, m); 423 #endif /*NBPFILTER > 0*/ 424 425 /* 426 * Put the packet to the network layer input queue according to the 427 * specified address family. 428 * Note: older versions of gif_input directly called network layer 429 * input functions, e.g. ip6_input, here. We changed the policy to 430 * prevent too many recursive calls of such input functions, which 431 * might cause kernel panic. But the change may introduce another 432 * problem; if the input queue is full, packets are discarded. 433 * The kernel stack overflow really happened, and we believed 434 * queue-full rarely occurs, so we changed the policy. 435 */ 436 switch (af) { 437 #ifdef INET 438 case AF_INET: 439 ifq = &ipintrq; 440 isr = NETISR_IP; 441 break; 442 #endif 443 #ifdef INET6 444 case AF_INET6: 445 ifq = &ip6intrq; 446 isr = NETISR_IPV6; 447 break; 448 #endif 449 #ifdef ISO 450 case AF_ISO: 451 m = gif_eon_decap(ifp, m); 452 if (!m) 453 return; 454 ifq = &clnlintrq; 455 isr = NETISR_ISO; 456 break; 457 #endif 458 default: 459 m_freem(m); 460 return; 461 } 462 463 s = splnet(); 464 if (IF_QFULL(ifq)) { 465 IF_DROP(ifq); /* update statistics */ 466 m_freem(m); 467 splx(s); 468 return; 469 } 470 ifp->if_ipackets++; 471 ifp->if_ibytes += m->m_pkthdr.len; 472 IF_ENQUEUE(ifq, m); 473 /* we need schednetisr since the address family may change */ 474 schednetisr(isr); 475 splx(s); 476 } 477 478 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 479 int 480 gif_ioctl(struct ifnet *ifp, u_long cmd, void *data) 481 { 482 struct lwp *l = curlwp; /* XXX */ 483 struct gif_softc *sc = (struct gif_softc*)ifp; 484 struct ifreq *ifr = (struct ifreq*)data; 485 int error = 0, size; 486 struct sockaddr *dst, *src; 487 #ifdef SIOCSIFMTU 488 u_long mtu; 489 #endif 490 491 switch (cmd) { 492 case SIOCSIFMTU: 493 case SIOCSLIFPHYADDR: 494 #ifdef SIOCDIFPHYADDR 495 case SIOCDIFPHYADDR: 496 #endif 497 if ((error = kauth_authorize_network(l->l_cred, 498 KAUTH_NETWORK_INTERFACE, 499 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 500 NULL)) != 0) 501 return (error); 502 /* FALLTHROUGH */ 503 default: 504 break; 505 } 506 507 switch (cmd) { 508 case SIOCSIFADDR: 509 ifp->if_flags |= IFF_UP; 510 break; 511 512 case SIOCSIFDSTADDR: 513 break; 514 515 case SIOCADDMULTI: 516 case SIOCDELMULTI: 517 switch (ifr->ifr_addr.sa_family) { 518 #ifdef INET 519 case AF_INET: /* IP supports Multicast */ 520 break; 521 #endif /* INET */ 522 #ifdef INET6 523 case AF_INET6: /* IP6 supports Multicast */ 524 break; 525 #endif /* INET6 */ 526 default: /* Other protocols doesn't support Multicast */ 527 error = EAFNOSUPPORT; 528 break; 529 } 530 break; 531 532 #ifdef SIOCSIFMTU /* xxx */ 533 case SIOCGIFMTU: 534 break; 535 536 case SIOCSIFMTU: 537 mtu = ifr->ifr_mtu; 538 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) 539 return (EINVAL); 540 ifp->if_mtu = mtu; 541 break; 542 #endif /* SIOCSIFMTU */ 543 544 #ifdef INET 545 case SIOCSIFPHYADDR: 546 #endif 547 #ifdef INET6 548 case SIOCSIFPHYADDR_IN6: 549 #endif /* INET6 */ 550 case SIOCSLIFPHYADDR: 551 switch (cmd) { 552 #ifdef INET 553 case SIOCSIFPHYADDR: 554 src = (struct sockaddr *) 555 &(((struct in_aliasreq *)data)->ifra_addr); 556 dst = (struct sockaddr *) 557 &(((struct in_aliasreq *)data)->ifra_dstaddr); 558 break; 559 #endif 560 #ifdef INET6 561 case SIOCSIFPHYADDR_IN6: 562 src = (struct sockaddr *) 563 &(((struct in6_aliasreq *)data)->ifra_addr); 564 dst = (struct sockaddr *) 565 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 566 break; 567 #endif 568 case SIOCSLIFPHYADDR: 569 src = (struct sockaddr *) 570 &(((struct if_laddrreq *)data)->addr); 571 dst = (struct sockaddr *) 572 &(((struct if_laddrreq *)data)->dstaddr); 573 break; 574 default: 575 return EINVAL; 576 } 577 578 /* sa_family must be equal */ 579 if (src->sa_family != dst->sa_family) 580 return EINVAL; 581 582 /* validate sa_len */ 583 switch (src->sa_family) { 584 #ifdef INET 585 case AF_INET: 586 if (src->sa_len != sizeof(struct sockaddr_in)) 587 return EINVAL; 588 break; 589 #endif 590 #ifdef INET6 591 case AF_INET6: 592 if (src->sa_len != sizeof(struct sockaddr_in6)) 593 return EINVAL; 594 break; 595 #endif 596 default: 597 return EAFNOSUPPORT; 598 } 599 switch (dst->sa_family) { 600 #ifdef INET 601 case AF_INET: 602 if (dst->sa_len != sizeof(struct sockaddr_in)) 603 return EINVAL; 604 break; 605 #endif 606 #ifdef INET6 607 case AF_INET6: 608 if (dst->sa_len != sizeof(struct sockaddr_in6)) 609 return EINVAL; 610 break; 611 #endif 612 default: 613 return EAFNOSUPPORT; 614 } 615 616 /* check sa_family looks sane for the cmd */ 617 switch (cmd) { 618 case SIOCSIFPHYADDR: 619 if (src->sa_family == AF_INET) 620 break; 621 return EAFNOSUPPORT; 622 #ifdef INET6 623 case SIOCSIFPHYADDR_IN6: 624 if (src->sa_family == AF_INET6) 625 break; 626 return EAFNOSUPPORT; 627 #endif /* INET6 */ 628 case SIOCSLIFPHYADDR: 629 /* checks done in the above */ 630 break; 631 } 632 633 error = gif_set_tunnel(&sc->gif_if, src, dst); 634 break; 635 636 #ifdef SIOCDIFPHYADDR 637 case SIOCDIFPHYADDR: 638 gif_delete_tunnel(&sc->gif_if); 639 break; 640 #endif 641 642 case SIOCGIFPSRCADDR: 643 #ifdef INET6 644 case SIOCGIFPSRCADDR_IN6: 645 #endif /* INET6 */ 646 if (sc->gif_psrc == NULL) { 647 error = EADDRNOTAVAIL; 648 goto bad; 649 } 650 src = sc->gif_psrc; 651 switch (cmd) { 652 #ifdef INET 653 case SIOCGIFPSRCADDR: 654 dst = &ifr->ifr_addr; 655 size = sizeof(ifr->ifr_addr); 656 break; 657 #endif /* INET */ 658 #ifdef INET6 659 case SIOCGIFPSRCADDR_IN6: 660 dst = (struct sockaddr *) 661 &(((struct in6_ifreq *)data)->ifr_addr); 662 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 663 break; 664 #endif /* INET6 */ 665 default: 666 error = EADDRNOTAVAIL; 667 goto bad; 668 } 669 if (src->sa_len > size) 670 return EINVAL; 671 memcpy(dst, src, src->sa_len); 672 break; 673 674 case SIOCGIFPDSTADDR: 675 #ifdef INET6 676 case SIOCGIFPDSTADDR_IN6: 677 #endif /* INET6 */ 678 if (sc->gif_pdst == NULL) { 679 error = EADDRNOTAVAIL; 680 goto bad; 681 } 682 src = sc->gif_pdst; 683 switch (cmd) { 684 #ifdef INET 685 case SIOCGIFPDSTADDR: 686 dst = &ifr->ifr_addr; 687 size = sizeof(ifr->ifr_addr); 688 break; 689 #endif /* INET */ 690 #ifdef INET6 691 case SIOCGIFPDSTADDR_IN6: 692 dst = (struct sockaddr *) 693 &(((struct in6_ifreq *)data)->ifr_addr); 694 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 695 break; 696 #endif /* INET6 */ 697 default: 698 error = EADDRNOTAVAIL; 699 goto bad; 700 } 701 if (src->sa_len > size) 702 return EINVAL; 703 memcpy(dst, src, src->sa_len); 704 break; 705 706 case SIOCGLIFPHYADDR: 707 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 708 error = EADDRNOTAVAIL; 709 goto bad; 710 } 711 712 /* copy src */ 713 src = sc->gif_psrc; 714 dst = (struct sockaddr *) 715 &(((struct if_laddrreq *)data)->addr); 716 size = sizeof(((struct if_laddrreq *)data)->addr); 717 if (src->sa_len > size) 718 return EINVAL; 719 memcpy(dst, src, src->sa_len); 720 721 /* copy dst */ 722 src = sc->gif_pdst; 723 dst = (struct sockaddr *) 724 &(((struct if_laddrreq *)data)->dstaddr); 725 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 726 if (src->sa_len > size) 727 return EINVAL; 728 memcpy(dst, src, src->sa_len); 729 break; 730 731 case SIOCSIFFLAGS: 732 /* if_ioctl() takes care of it */ 733 break; 734 735 default: 736 error = EINVAL; 737 break; 738 } 739 bad: 740 return error; 741 } 742 743 int 744 gif_set_tunnel(struct ifnet *ifp, struct sockaddr *src, struct sockaddr *dst) 745 { 746 struct gif_softc *sc = (struct gif_softc *)ifp; 747 struct gif_softc *sc2; 748 struct sockaddr *osrc, *odst; 749 int s; 750 int error; 751 752 s = splsoftnet(); 753 754 LIST_FOREACH(sc2, &gif_softc_list, gif_list) { 755 if (sc2 == sc) 756 continue; 757 if (!sc2->gif_pdst || !sc2->gif_psrc) 758 continue; 759 /* can't configure same pair of address onto two gifs */ 760 if (sockaddr_cmp(sc2->gif_pdst, dst) == 0 && 761 sockaddr_cmp(sc2->gif_psrc, src) == 0) { 762 error = EADDRNOTAVAIL; 763 goto bad; 764 } 765 766 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 767 } 768 769 if (sc->gif_si) { 770 softintr_disestablish(sc->gif_si); 771 sc->gif_si = NULL; 772 } 773 774 /* XXX we can detach from both, but be polite just in case */ 775 if (sc->gif_psrc) 776 switch (sc->gif_psrc->sa_family) { 777 #ifdef INET 778 case AF_INET: 779 (void)in_gif_detach(sc); 780 break; 781 #endif 782 #ifdef INET6 783 case AF_INET6: 784 (void)in6_gif_detach(sc); 785 break; 786 #endif 787 } 788 789 sc->gif_si = softintr_establish(IPL_SOFTNET, gifintr, sc); 790 if (sc->gif_si == NULL) { 791 error = ENOMEM; 792 goto bad; 793 } 794 795 osrc = sc->gif_psrc; 796 sc->gif_psrc = sockaddr_dup(src, M_WAITOK); 797 798 odst = sc->gif_pdst; 799 sc->gif_pdst = sockaddr_dup(dst, M_WAITOK); 800 801 switch (sc->gif_psrc->sa_family) { 802 #ifdef INET 803 case AF_INET: 804 error = in_gif_attach(sc); 805 break; 806 #endif 807 #ifdef INET6 808 case AF_INET6: 809 error = in6_gif_attach(sc); 810 break; 811 #endif 812 default: 813 error = EINVAL; 814 break; 815 } 816 if (error) { 817 /* rollback */ 818 sockaddr_free(sc->gif_psrc); 819 sockaddr_free(sc->gif_pdst); 820 sc->gif_psrc = osrc; 821 sc->gif_pdst = odst; 822 goto bad; 823 } 824 825 if (osrc) 826 sockaddr_free(osrc); 827 if (odst) 828 sockaddr_free(odst); 829 830 if (sc->gif_psrc && sc->gif_pdst) 831 ifp->if_flags |= IFF_RUNNING; 832 else 833 ifp->if_flags &= ~IFF_RUNNING; 834 splx(s); 835 836 return 0; 837 838 bad: 839 if (sc->gif_si) { 840 softintr_disestablish(sc->gif_si); 841 sc->gif_si = NULL; 842 } 843 if (sc->gif_psrc && sc->gif_pdst) 844 ifp->if_flags |= IFF_RUNNING; 845 else 846 ifp->if_flags &= ~IFF_RUNNING; 847 splx(s); 848 849 return error; 850 } 851 852 void 853 gif_delete_tunnel(struct ifnet *ifp) 854 { 855 struct gif_softc *sc = (struct gif_softc *)ifp; 856 int s; 857 858 s = splsoftnet(); 859 860 if (sc->gif_si) { 861 softintr_disestablish(sc->gif_si); 862 sc->gif_si = NULL; 863 } 864 if (sc->gif_psrc) { 865 sockaddr_free(sc->gif_psrc); 866 sc->gif_psrc = NULL; 867 } 868 if (sc->gif_pdst) { 869 sockaddr_free(sc->gif_pdst); 870 sc->gif_pdst = NULL; 871 } 872 /* it is safe to detach from both */ 873 #ifdef INET 874 (void)in_gif_detach(sc); 875 #endif 876 #ifdef INET6 877 (void)in6_gif_detach(sc); 878 #endif 879 880 if (sc->gif_psrc && sc->gif_pdst) 881 ifp->if_flags |= IFF_RUNNING; 882 else 883 ifp->if_flags &= ~IFF_RUNNING; 884 splx(s); 885 } 886 887 #ifdef ISO 888 struct eonhdr { 889 u_int8_t version; 890 u_int8_t class; 891 u_int16_t cksum; 892 }; 893 894 /* 895 * prepend EON header to ISO PDU 896 */ 897 static struct mbuf * 898 gif_eon_encap(struct mbuf *m) 899 { 900 struct eonhdr *ehdr; 901 902 M_PREPEND(m, sizeof(*ehdr), M_DONTWAIT); 903 if (m && m->m_len < sizeof(*ehdr)) 904 m = m_pullup(m, sizeof(*ehdr)); 905 if (m == NULL) 906 return NULL; 907 ehdr = mtod(m, struct eonhdr *); 908 ehdr->version = 1; 909 ehdr->class = 0; /* always unicast */ 910 #if 0 911 /* calculate the checksum of the eonhdr */ 912 { 913 struct mbuf mhead; 914 memset(&mhead, 0, sizeof(mhead)); 915 ehdr->cksum = 0; 916 mhead.m_data = (void *)ehdr; 917 mhead.m_len = sizeof(*ehdr); 918 mhead.m_next = 0; 919 iso_gen_csum(&mhead, offsetof(struct eonhdr, cksum), 920 mhead.m_len); 921 } 922 #else 923 /* since the data is always constant we'll just plug the value in */ 924 ehdr->cksum = htons(0xfc02); 925 #endif 926 return m; 927 } 928 929 /* 930 * remove EON header and check checksum 931 */ 932 static struct mbuf * 933 gif_eon_decap(struct ifnet *ifp, struct mbuf *m) 934 { 935 struct eonhdr *ehdr; 936 937 if (m->m_len < sizeof(*ehdr) && 938 (m = m_pullup(m, sizeof(*ehdr))) == NULL) { 939 ifp->if_ierrors++; 940 return NULL; 941 } 942 if (iso_check_csum(m, sizeof(struct eonhdr))) { 943 m_freem(m); 944 return NULL; 945 } 946 m_adj(m, sizeof(*ehdr)); 947 return m; 948 } 949 #endif /*ISO*/ 950
Indexes created Mon Sep 29 21:09:56 GMT 2025