if_gif.c revision 1.24
1 /* $NetBSD: if_gif.c,v 1.24 2001/02/20 08:48:27 itojun Exp $ */ 2 /* $KAME: if_gif.c,v 1.42 2001/02/20 08:31:06 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 #include "opt_iso.h" 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/kernel.h> 39 #include <sys/mbuf.h> 40 #include <sys/socket.h> 41 #include <sys/sockio.h> 42 #include <sys/errno.h> 43 #include <sys/ioctl.h> 44 #include <sys/time.h> 45 #include <sys/syslog.h> 46 #include <sys/proc.h> 47 #include <sys/protosw.h> 48 #include <machine/cpu.h> 49 50 #include <net/if.h> 51 #include <net/if_types.h> 52 #include <net/netisr.h> 53 #include <net/route.h> 54 #include <net/bpf.h> 55 56 #include <netinet/in.h> 57 #include <netinet/in_systm.h> 58 #include <netinet/ip.h> 59 #ifdef INET 60 #include <netinet/in_var.h> 61 #include <netinet/in_gif.h> 62 #endif /* INET */ 63 64 #ifdef INET6 65 #ifndef INET 66 #include <netinet/in.h> 67 #endif 68 #include <netinet6/in6_var.h> 69 #include <netinet/ip6.h> 70 #include <netinet6/ip6_var.h> 71 #include <netinet6/in6_gif.h> 72 #include <netinet6/ip6protosw.h> 73 #endif /* INET6 */ 74 75 #ifdef ISO 76 #include <netiso/iso.h> 77 #include <netiso/iso_var.h> 78 #endif 79 80 #include <netinet/ip_encap.h> 81 #include <net/if_gif.h> 82 83 #include "gif.h" 84 #include "bpfilter.h" 85 86 #include <net/net_osdep.h> 87 88 #if NGIF > 0 89 90 void gifattach __P((int)); 91 static int gif_encapcheck __P((const struct mbuf *, int, int, void *)); 92 #ifdef INET 93 extern struct protosw in_gif_protosw; 94 #endif 95 #ifdef INET6 96 extern struct ip6protosw in6_gif_protosw; 97 #endif 98 #ifdef ISO 99 static int gif_eon_encap(struct mbuf **); 100 static int gif_eon_decap(struct ifnet *, struct mbuf **); 101 #endif 102 103 /* 104 * gif global variable definitions 105 */ 106 LIST_HEAD(, gif_softc) gif_softc_list; 107 108 int gif_clone_create __P((struct if_clone *, int)); 109 void gif_clone_destroy __P((struct ifnet *)); 110 111 struct if_clone gif_cloner = 112 IF_CLONE_INITIALIZER("gif", gif_clone_create, gif_clone_destroy); 113 114 void gif_delete_tunnel __P((struct gif_softc *)); 115 116 #ifndef MAX_GIF_NEST 117 /* 118 * This macro controls the upper limitation on nesting of gif tunnels. 119 * Since, setting a large value to this macro with a careless configuration 120 * may introduce system crash, we don't allow any nestings by default. 121 * If you need to configure nested gif tunnels, you can define this macro 122 * in your kernel configuration file. However, if you do so, please be 123 * careful to configure the tunnels so that it won't make a loop. 124 */ 125 #define MAX_GIF_NEST 1 126 #endif 127 static int max_gif_nesting = MAX_GIF_NEST; 128 129 /* ARGSUSED */ 130 void 131 gifattach(count) 132 int count; 133 { 134 135 LIST_INIT(&gif_softc_list); 136 if_clone_attach(&gif_cloner); 137 } 138 139 int 140 gif_clone_create(ifc, unit) 141 struct if_clone *ifc; 142 int unit; 143 { 144 struct gif_softc *sc; 145 146 sc = malloc(sizeof(struct gif_softc), M_DEVBUF, M_WAIT); 147 bzero(sc, sizeof(struct gif_softc)); 148 149 sprintf(sc->gif_if.if_xname, "%s%d", ifc->ifc_name, unit); 150 151 sc->encap_cookie4 = sc->encap_cookie6 = NULL; 152 #ifdef INET 153 sc->encap_cookie4 = encap_attach_func(AF_INET, -1, 154 gif_encapcheck, &in_gif_protosw, sc); 155 if (sc->encap_cookie4 == NULL) { 156 printf("%s: unable to attach encap4\n", if_name(&sc->gif_if)); 157 free(sc, M_DEVBUF); 158 return (EIO); /* XXX */ 159 } 160 #endif 161 #ifdef INET6 162 sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, 163 gif_encapcheck, (struct protosw *)&in6_gif_protosw, sc); 164 if (sc->encap_cookie6 == NULL) { 165 if (sc->encap_cookie4) { 166 encap_detach(sc->encap_cookie4); 167 sc->encap_cookie4 = NULL; 168 } 169 printf("%s: unable to attach encap6\n", if_name(&sc->gif_if)); 170 free(sc, M_DEVBUF); 171 return (EIO); /* XXX */ 172 } 173 #endif 174 175 sc->gif_if.if_mtu = GIF_MTU; 176 sc->gif_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 177 sc->gif_if.if_ioctl = gif_ioctl; 178 sc->gif_if.if_output = gif_output; 179 sc->gif_if.if_type = IFT_GIF; 180 sc->gif_if.if_dlt = DLT_NULL; 181 if_attach(&sc->gif_if); 182 if_alloc_sadl(&sc->gif_if); 183 #if NBPFILTER > 0 184 bpfattach(&sc->gif_if, DLT_NULL, sizeof(u_int)); 185 #endif 186 LIST_INSERT_HEAD(&gif_softc_list, sc, gif_list); 187 return (0); 188 } 189 190 void 191 gif_clone_destroy(ifp) 192 struct ifnet *ifp; 193 { 194 struct gif_softc *sc = (void *) ifp; 195 196 gif_delete_tunnel(sc); 197 LIST_REMOVE(sc, gif_list); 198 #ifdef INET6 199 encap_detach(sc->encap_cookie6); 200 #endif 201 #ifdef INET 202 encap_detach(sc->encap_cookie4); 203 #endif 204 205 #if NBPFILTER > 0 206 bpfdetach(ifp); 207 #endif 208 if_detach(ifp); 209 210 free(sc, M_DEVBUF); 211 } 212 213 static int 214 gif_encapcheck(m, off, proto, arg) 215 const struct mbuf *m; 216 int off; 217 int proto; 218 void *arg; 219 { 220 struct ip ip; 221 struct gif_softc *sc; 222 223 sc = (struct gif_softc *)arg; 224 if (sc == NULL) 225 return 0; 226 227 if ((sc->gif_if.if_flags & IFF_UP) == 0) 228 return 0; 229 230 /* no physical address */ 231 if (!sc->gif_psrc || !sc->gif_pdst) 232 return 0; 233 234 switch (proto) { 235 #ifdef INET 236 case IPPROTO_IPV4: 237 break; 238 #endif 239 #ifdef INET6 240 case IPPROTO_IPV6: 241 break; 242 #endif 243 #ifdef ISO 244 case IPPROTO_EON: 245 break; 246 #endif 247 default: 248 return 0; 249 } 250 251 /* LINTED const cast */ 252 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); 253 254 switch (ip.ip_v) { 255 #ifdef INET 256 case 4: 257 if (sc->gif_psrc->sa_family != AF_INET || 258 sc->gif_pdst->sa_family != AF_INET) 259 return 0; 260 return gif_encapcheck4(m, off, proto, arg); 261 #endif 262 #ifdef INET6 263 case 6: 264 if (sc->gif_psrc->sa_family != AF_INET6 || 265 sc->gif_pdst->sa_family != AF_INET6) 266 return 0; 267 return gif_encapcheck6(m, off, proto, arg); 268 #endif 269 default: 270 return 0; 271 } 272 } 273 274 int 275 gif_output(ifp, m, dst, rt) 276 struct ifnet *ifp; 277 struct mbuf *m; 278 struct sockaddr *dst; 279 struct rtentry *rt; /* added in net2 */ 280 { 281 struct gif_softc *sc = (struct gif_softc*)ifp; 282 int error = 0; 283 static int called = 0; /* XXX: MUTEX */ 284 285 /* 286 * gif may cause infinite recursion calls when misconfigured. 287 * We'll prevent this by introducing upper limit. 288 * XXX: this mechanism may introduce another problem about 289 * mutual exclusion of the variable CALLED, especially if we 290 * use kernel thread. 291 */ 292 if (++called > max_gif_nesting) { 293 log(LOG_NOTICE, 294 "gif_output: recursively called too many times(%d)\n", 295 called); 296 m_freem(m); 297 error = EIO; /* is there better errno? */ 298 goto end; 299 } 300 301 ifp->if_lastchange = time; 302 m->m_flags &= ~(M_BCAST|M_MCAST); 303 if (!(ifp->if_flags & IFF_UP) || 304 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 305 m_freem(m); 306 error = ENETDOWN; 307 goto end; 308 } 309 310 #if NBPFILTER > 0 311 if (ifp->if_bpf) { 312 /* 313 * We need to prepend the address family as 314 * a four byte field. Cons up a dummy header 315 * to pacify bpf. This is safe because bpf 316 * will only read from the mbuf (i.e., it won't 317 * try to free it or keep a pointer a to it). 318 */ 319 struct mbuf m0; 320 u_int32_t af = dst->sa_family; 321 322 m0.m_next = m; 323 m0.m_len = 4; 324 m0.m_data = (char *)⁡ 325 326 #ifdef HAVE_OLD_BPF 327 bpf_mtap(ifp, &m0); 328 #else 329 bpf_mtap(ifp->if_bpf, &m0); 330 #endif 331 } 332 #endif 333 ifp->if_opackets++; 334 ifp->if_obytes += m->m_pkthdr.len; 335 336 /* inner AF-specific encapsulation */ 337 switch (dst->sa_family) { 338 #ifdef ISO 339 case AF_ISO: 340 error = gif_eon_encap(&m); 341 if (error) 342 goto end; 343 #endif 344 default: 345 break; 346 } 347 348 /* XXX should we check if our outer source is legal? */ 349 350 /* dispatch to output logic based on outer AF */ 351 switch (sc->gif_psrc->sa_family) { 352 #ifdef INET 353 case AF_INET: 354 error = in_gif_output(ifp, dst->sa_family, m, rt); 355 break; 356 #endif 357 #ifdef INET6 358 case AF_INET6: 359 error = in6_gif_output(ifp, dst->sa_family, m, rt); 360 break; 361 #endif 362 default: 363 m_freem(m); 364 error = ENETDOWN; 365 } 366 367 end: 368 called = 0; /* reset recursion counter */ 369 if (error) ifp->if_oerrors++; 370 return error; 371 } 372 373 void 374 gif_input(m, af, gifp) 375 struct mbuf *m; 376 int af; 377 struct ifnet *gifp; 378 { 379 int s, isr; 380 struct ifqueue *ifq = 0; 381 382 if (gifp == NULL) { 383 /* just in case */ 384 m_freem(m); 385 return; 386 } 387 388 m->m_pkthdr.rcvif = gifp; 389 390 #if NBPFILTER > 0 391 if (gifp->if_bpf) { 392 /* 393 * We need to prepend the address family as 394 * a four byte field. Cons up a dummy header 395 * to pacify bpf. This is safe because bpf 396 * will only read from the mbuf (i.e., it won't 397 * try to free it or keep a pointer a to it). 398 */ 399 struct mbuf m0; 400 u_int32_t af1 = af; 401 402 m0.m_next = m; 403 m0.m_len = 4; 404 m0.m_data = (char *)&af1; 405 406 #ifdef HAVE_OLD_BPF 407 bpf_mtap(gifp, &m0); 408 #else 409 bpf_mtap(gifp->if_bpf, &m0); 410 #endif 411 } 412 #endif /*NBPFILTER > 0*/ 413 414 /* 415 * Put the packet to the network layer input queue according to the 416 * specified address family. 417 * Note: older versions of gif_input directly called network layer 418 * input functions, e.g. ip6_input, here. We changed the policy to 419 * prevent too many recursive calls of such input functions, which 420 * might cause kernel panic. But the change may introduce another 421 * problem; if the input queue is full, packets are discarded. 422 * We believed it rarely occurs and changed the policy. If we find 423 * it occurs more times than we thought, we may change the policy 424 * again. 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 if (gif_eon_decap(gifp, &m)) { 442 if (m) 443 m_freem(m); 444 return; 445 } 446 ifq = &clnlintrq; 447 isr = NETISR_ISO; 448 break; 449 #endif 450 default: 451 m_freem(m); 452 return; 453 } 454 455 s = splimp(); 456 if (IF_QFULL(ifq)) { 457 IF_DROP(ifq); /* update statistics */ 458 m_freem(m); 459 splx(s); 460 return; 461 } 462 IF_ENQUEUE(ifq, m); 463 /* we need schednetisr since the address family may change */ 464 schednetisr(isr); 465 gifp->if_ipackets++; 466 gifp->if_ibytes += m->m_pkthdr.len; 467 splx(s); 468 469 return; 470 } 471 472 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 473 int 474 gif_ioctl(ifp, cmd, data) 475 struct ifnet *ifp; 476 u_long cmd; 477 caddr_t data; 478 { 479 struct proc *p = curproc; /* XXX */ 480 struct gif_softc *sc = (struct gif_softc*)ifp; 481 struct ifreq *ifr = (struct ifreq*)data; 482 int error = 0, size; 483 struct sockaddr *dst, *src; 484 struct sockaddr *sa; 485 struct gif_softc *sc2; 486 487 switch (cmd) { 488 case SIOCSIFADDR: 489 break; 490 491 case SIOCSIFDSTADDR: 492 break; 493 494 case SIOCADDMULTI: 495 case SIOCDELMULTI: 496 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 497 break; 498 switch (ifr->ifr_addr.sa_family) { 499 #ifdef INET 500 case AF_INET: /* IP supports Multicast */ 501 break; 502 #endif /* INET */ 503 #ifdef INET6 504 case AF_INET6: /* IP6 supports Multicast */ 505 break; 506 #endif /* INET6 */ 507 default: /* Other protocols doesn't support Multicast */ 508 error = EAFNOSUPPORT; 509 break; 510 } 511 break; 512 513 #ifdef SIOCSIFMTU /* xxx */ 514 case SIOCGIFMTU: 515 break; 516 517 case SIOCSIFMTU: 518 { 519 u_long mtu; 520 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 521 break; 522 mtu = ifr->ifr_mtu; 523 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) { 524 return (EINVAL); 525 } 526 ifp->if_mtu = mtu; 527 } 528 break; 529 #endif /* SIOCSIFMTU */ 530 531 case SIOCSIFPHYADDR: 532 #ifdef INET6 533 case SIOCSIFPHYADDR_IN6: 534 #endif /* INET6 */ 535 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 536 break; 537 switch (cmd) { 538 #ifdef INET 539 case SIOCSIFPHYADDR: 540 src = (struct sockaddr *) 541 &(((struct in_aliasreq *)data)->ifra_addr); 542 dst = (struct sockaddr *) 543 &(((struct in_aliasreq *)data)->ifra_dstaddr); 544 if (src->sa_len != sizeof(struct sockaddr_in) || 545 dst->sa_len != sizeof(struct sockaddr_in)) 546 return EINVAL; 547 if (src->sa_family != AF_INET || 548 dst->sa_family != AF_INET) 549 return EAFNOSUPPORT; 550 break; 551 #endif 552 #ifdef INET6 553 case SIOCSIFPHYADDR_IN6: 554 src = (struct sockaddr *) 555 &(((struct in6_aliasreq *)data)->ifra_addr); 556 dst = (struct sockaddr *) 557 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 558 if (src->sa_len != sizeof(struct sockaddr_in6) || 559 dst->sa_len != sizeof(struct sockaddr_in6)) 560 return EINVAL; 561 if (src->sa_family != AF_INET6 || 562 dst->sa_family != AF_INET6) 563 return EAFNOSUPPORT; 564 break; 565 #endif 566 } 567 568 for (sc2 = LIST_FIRST(&gif_softc_list); sc2 != NULL; 569 sc2 = LIST_NEXT(sc2, gif_list)) { 570 if (sc2 == sc) 571 continue; 572 if (!sc2->gif_pdst || !sc2->gif_psrc) 573 continue; 574 if (sc2->gif_pdst->sa_family != dst->sa_family || 575 sc2->gif_pdst->sa_len != dst->sa_len || 576 sc2->gif_psrc->sa_family != src->sa_family || 577 sc2->gif_psrc->sa_len != src->sa_len) 578 continue; 579 580 /* can't configure same pair of address onto two gifs */ 581 if (bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 582 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 583 error = EADDRNOTAVAIL; 584 goto bad; 585 } 586 587 /* can't configure multiple multi-dest interfaces */ 588 #define multidest(x) \ 589 (((struct sockaddr_in *)(x))->sin_addr.s_addr == INADDR_ANY) 590 #ifdef INET6 591 #define multidest6(x) \ 592 (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)(x))->sin6_addr)) 593 #endif 594 if (dst->sa_family == AF_INET && 595 multidest(dst) && multidest(sc2->gif_pdst)) { 596 error = EADDRNOTAVAIL; 597 goto bad; 598 } 599 #ifdef INET6 600 if (dst->sa_family == AF_INET6 && 601 multidest6(dst) && multidest6(sc2->gif_pdst)) { 602 error = EADDRNOTAVAIL; 603 goto bad; 604 } 605 #endif 606 } 607 608 if (src->sa_family != dst->sa_family || 609 src->sa_len != dst->sa_len) { 610 error = EINVAL; 611 break; 612 } 613 switch (src->sa_family) { 614 #ifdef INET 615 case AF_INET: 616 size = sizeof(struct sockaddr_in); 617 break; 618 #endif 619 #ifdef INET6 620 case AF_INET6: 621 size = sizeof(struct sockaddr_in6); 622 break; 623 #endif 624 default: 625 error = EAFNOSUPPORT; 626 goto bad; 627 } 628 if (src->sa_len != size) { 629 error = EINVAL; 630 break; 631 } 632 633 if (sc->gif_psrc) 634 free((caddr_t)sc->gif_psrc, M_IFADDR); 635 sa = (struct sockaddr *)malloc(size, M_IFADDR, M_WAITOK); 636 bcopy((caddr_t)src, (caddr_t)sa, size); 637 sc->gif_psrc = sa; 638 639 if (sc->gif_pdst) 640 free((caddr_t)sc->gif_pdst, M_IFADDR); 641 sa = (struct sockaddr *)malloc(size, M_IFADDR, M_WAITOK); 642 bcopy((caddr_t)dst, (caddr_t)sa, size); 643 sc->gif_pdst = sa; 644 645 ifp->if_flags |= IFF_UP; 646 if_up(ifp); /* send up RTM_IFINFO */ 647 648 error = 0; 649 break; 650 651 #ifdef SIOCDIFPHYADDR 652 case SIOCDIFPHYADDR: 653 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 654 break; 655 gif_delete_tunnel(sc); 656 break; 657 #endif 658 659 case SIOCGIFPSRCADDR: 660 #ifdef INET6 661 case SIOCGIFPSRCADDR_IN6: 662 #endif /* INET6 */ 663 if (sc->gif_psrc == NULL) { 664 error = EADDRNOTAVAIL; 665 goto bad; 666 } 667 src = sc->gif_psrc; 668 switch (cmd) { 669 #ifdef INET 670 case SIOCGIFPSRCADDR: 671 dst = &ifr->ifr_addr; 672 size = sizeof(ifr->ifr_addr); 673 break; 674 #endif /* INET */ 675 #ifdef INET6 676 case SIOCGIFPSRCADDR_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 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 689 break; 690 691 case SIOCGIFPDSTADDR: 692 #ifdef INET6 693 case SIOCGIFPDSTADDR_IN6: 694 #endif /* INET6 */ 695 if (sc->gif_pdst == NULL) { 696 error = EADDRNOTAVAIL; 697 goto bad; 698 } 699 src = sc->gif_pdst; 700 switch (cmd) { 701 #ifdef INET 702 case SIOCGIFPDSTADDR: 703 dst = &ifr->ifr_addr; 704 size = sizeof(ifr->ifr_addr); 705 break; 706 #endif /* INET */ 707 #ifdef INET6 708 case SIOCGIFPDSTADDR_IN6: 709 dst = (struct sockaddr *) 710 &(((struct in6_ifreq *)data)->ifr_addr); 711 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 712 break; 713 #endif /* INET6 */ 714 default: 715 error = EADDRNOTAVAIL; 716 goto bad; 717 } 718 if (src->sa_len > size) 719 return EINVAL; 720 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 721 break; 722 723 case SIOCSIFFLAGS: 724 /* if_ioctl() takes care of it */ 725 break; 726 727 default: 728 error = EINVAL; 729 break; 730 } 731 bad: 732 return error; 733 } 734 735 void 736 gif_delete_tunnel(sc) 737 struct gif_softc *sc; 738 { 739 int s; 740 741 s = splsoftnet(); 742 743 if (sc->gif_psrc) { 744 free((caddr_t)sc->gif_psrc, M_IFADDR); 745 sc->gif_psrc = NULL; 746 } 747 if (sc->gif_pdst) { 748 free((caddr_t)sc->gif_pdst, M_IFADDR); 749 sc->gif_pdst = NULL; 750 } 751 /* change the IFF_UP flag as well? */ 752 753 splx(s); 754 } 755 756 #ifdef ISO 757 struct eonhdr { 758 u_int8_t version; 759 u_int8_t class; 760 u_int16_t cksum; 761 } *ehdr; 762 763 /* 764 * prepend EON header to ISO PDU 765 */ 766 static int 767 gif_eon_encap(struct mbuf **m) 768 { 769 struct eonhdr *ehdr; 770 771 M_PREPEND(*m, sizeof(*ehdr), M_DONTWAIT); 772 if (*m && (*m)->m_len < sizeof(*ehdr)) 773 *m = m_pullup(*m, sizeof(*ehdr)); 774 if (*m == NULL) { 775 printf("ENOBUFS in gif_eon_encap %d\n", __LINE__); 776 return ENOBUFS; 777 } 778 ehdr = mtod(*m, struct eonhdr *); 779 ehdr->version = 1; 780 ehdr->class = 0; /* always unicast */ 781 #if 0 782 /* calculate the checksum of the eonhdr */ 783 { 784 struct mbuf mhead; 785 memset(&mhead, 0, sizeof(mhead)); 786 ehdr->cksum = 0; 787 mhead.m_data = (caddr_t)ehdr; 788 mhead.m_len = sizeof(*ehdr); 789 mhead.m_next = 0; 790 iso_gen_csum(&mhead, offsetof(struct eonhdr, cksum), 791 mhead.m_len); 792 } 793 #else 794 /* since the data is always constant we'll just plug the value in */ 795 ehdr->cksum = htons(0xfc02); 796 #endif 797 return (0); 798 } 799 800 /* 801 * remove EON header and check checksum 802 */ 803 static int 804 gif_eon_decap(struct ifnet *gifp, struct mbuf **m) 805 { 806 struct eonhdr *ehdr; 807 808 if ((*m)->m_len < sizeof(*ehdr) && 809 (*m = m_pullup(*m, sizeof(*ehdr))) == 0) { 810 gifp->if_ierrors++; 811 return (EINVAL); 812 } 813 if (iso_check_csum(*m, sizeof(struct eonhdr))) 814 return (EINVAL); 815 m_adj(*m, sizeof(*ehdr)); 816 return (0); 817 } 818 #endif /*ISO*/ 819 #endif /*NGIF > 0*/ 820
Indexes created Thu Sep 25 16:09:42 GMT 2025