if_gif.c revision 1.46
1 /* $NetBSD: if_gif.c,v 1.46 2004/08/19 20:58:24 christos 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 1.46 2004/08/19 20:58:24 christos 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 <machine/cpu.h> 52 #include <machine/intr.h> 53 54 #include <net/if.h> 55 #include <net/if_types.h> 56 #include <net/netisr.h> 57 #include <net/route.h> 58 #include <net/bpf.h> 59 60 #include <netinet/in.h> 61 #include <netinet/in_systm.h> 62 #include <netinet/ip.h> 63 #ifdef INET 64 #include <netinet/in_var.h> 65 #include <netinet/in_gif.h> 66 #endif /* INET */ 67 68 #ifdef INET6 69 #ifndef INET 70 #include <netinet/in.h> 71 #endif 72 #include <netinet6/in6_var.h> 73 #include <netinet/ip6.h> 74 #include <netinet6/ip6_var.h> 75 #include <netinet6/in6_gif.h> 76 #include <netinet6/ip6protosw.h> 77 #endif /* INET6 */ 78 79 #ifdef ISO 80 #include <netiso/iso.h> 81 #include <netiso/iso_var.h> 82 #endif 83 84 #include <netinet/ip_encap.h> 85 #include <net/if_gif.h> 86 87 #include "bpfilter.h" 88 89 #include <net/net_osdep.h> 90 91 void gifattach __P((int)); 92 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 93 void gifnetisr __P((void)); 94 #endif 95 void gifintr __P((void *)); 96 #ifdef ISO 97 static struct mbuf *gif_eon_encap __P((struct mbuf *)); 98 static struct mbuf *gif_eon_decap __P((struct ifnet *, struct mbuf *)); 99 #endif 100 101 /* 102 * gif global variable definitions 103 */ 104 LIST_HEAD(, gif_softc) gif_softc_list; 105 106 int gif_clone_create __P((struct if_clone *, int)); 107 void gif_clone_destroy __P((struct ifnet *)); 108 109 struct if_clone gif_cloner = 110 IF_CLONE_INITIALIZER("gif", gif_clone_create, gif_clone_destroy); 111 112 #ifndef MAX_GIF_NEST 113 /* 114 * This macro controls the upper limitation on nesting of gif tunnels. 115 * Since, setting a large value to this macro with a careless configuration 116 * may introduce system crash, we don't allow any nestings by default. 117 * If you need to configure nested gif tunnels, you can define this macro 118 * in your kernel configuration file. However, if you do so, please be 119 * careful to configure the tunnels so that it won't make a loop. 120 */ 121 #define MAX_GIF_NEST 1 122 #endif 123 static int max_gif_nesting = MAX_GIF_NEST; 124 125 /* ARGSUSED */ 126 void 127 gifattach(count) 128 int count; 129 { 130 131 LIST_INIT(&gif_softc_list); 132 if_clone_attach(&gif_cloner); 133 } 134 135 int 136 gif_clone_create(ifc, unit) 137 struct if_clone *ifc; 138 int unit; 139 { 140 struct gif_softc *sc; 141 142 sc = malloc(sizeof(struct gif_softc), M_DEVBUF, M_WAIT); 143 memset(sc, 0, sizeof(struct gif_softc)); 144 145 snprintf(sc->gif_if.if_xname, sizeof(sc->gif_if.if_xname), "%s%d", 146 ifc->ifc_name, unit); 147 148 gifattach0(sc); 149 150 LIST_INSERT_HEAD(&gif_softc_list, sc, gif_list); 151 return (0); 152 } 153 154 void 155 gifattach0(sc) 156 struct gif_softc *sc; 157 { 158 159 sc->encap_cookie4 = sc->encap_cookie6 = NULL; 160 161 sc->gif_if.if_addrlen = 0; 162 sc->gif_if.if_mtu = GIF_MTU; 163 sc->gif_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 164 sc->gif_if.if_ioctl = gif_ioctl; 165 sc->gif_if.if_output = gif_output; 166 sc->gif_if.if_type = IFT_GIF; 167 sc->gif_if.if_dlt = DLT_NULL; 168 IFQ_SET_READY(&sc->gif_if.if_snd); 169 if_attach(&sc->gif_if); 170 if_alloc_sadl(&sc->gif_if); 171 #if NBPFILTER > 0 172 bpfattach(&sc->gif_if, DLT_NULL, sizeof(u_int)); 173 #endif 174 } 175 176 void 177 gif_clone_destroy(ifp) 178 struct ifnet *ifp; 179 { 180 struct gif_softc *sc = (void *) ifp; 181 182 gif_delete_tunnel(&sc->gif_if); 183 LIST_REMOVE(sc, gif_list); 184 #ifdef INET6 185 encap_detach(sc->encap_cookie6); 186 #endif 187 #ifdef INET 188 encap_detach(sc->encap_cookie4); 189 #endif 190 191 #if NBPFILTER > 0 192 bpfdetach(ifp); 193 #endif 194 if_detach(ifp); 195 196 free(sc, M_DEVBUF); 197 } 198 199 #ifdef GIF_ENCAPCHECK 200 int 201 gif_encapcheck(m, off, proto, arg) 202 const struct mbuf *m; 203 int off; 204 int proto; 205 void *arg; 206 { 207 struct ip ip; 208 struct gif_softc *sc; 209 210 sc = (struct gif_softc *)arg; 211 if (sc == NULL) 212 return 0; 213 214 if ((sc->gif_if.if_flags & IFF_UP) == 0) 215 return 0; 216 217 /* no physical address */ 218 if (!sc->gif_psrc || !sc->gif_pdst) 219 return 0; 220 221 switch (proto) { 222 #ifdef INET 223 case IPPROTO_IPV4: 224 break; 225 #endif 226 #ifdef INET6 227 case IPPROTO_IPV6: 228 break; 229 #endif 230 #ifdef ISO 231 case IPPROTO_EON: 232 break; 233 #endif 234 default: 235 return 0; 236 } 237 238 /* Bail on short packets */ 239 KASSERT(m->m_flags & M_PKTHDR); 240 if (m->m_pkthdr.len < sizeof(ip)) 241 return 0; 242 243 /* LINTED const cast */ 244 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); 245 246 switch (ip.ip_v) { 247 #ifdef INET 248 case 4: 249 if (sc->gif_psrc->sa_family != AF_INET || 250 sc->gif_pdst->sa_family != AF_INET) 251 return 0; 252 return gif_encapcheck4(m, off, proto, arg); 253 #endif 254 #ifdef INET6 255 case 6: 256 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) 257 return 0; 258 if (sc->gif_psrc->sa_family != AF_INET6 || 259 sc->gif_pdst->sa_family != AF_INET6) 260 return 0; 261 return gif_encapcheck6(m, off, proto, arg); 262 #endif 263 default: 264 return 0; 265 } 266 } 267 #endif 268 269 int 270 gif_output(ifp, m, dst, rt) 271 struct ifnet *ifp; 272 struct mbuf *m; 273 struct sockaddr *dst; 274 struct rtentry *rt; /* added in net2 */ 275 { 276 struct gif_softc *sc = (struct gif_softc*)ifp; 277 int error = 0; 278 static int called = 0; /* XXX: MUTEX */ 279 ALTQ_DECL(struct altq_pktattr pktattr;) 280 int s; 281 282 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 283 284 /* 285 * gif may cause infinite recursion calls when misconfigured. 286 * We'll prevent this by introducing upper limit. 287 * XXX: this mechanism may introduce another problem about 288 * mutual exclusion of the variable CALLED, especially if we 289 * use kernel thread. 290 */ 291 if (++called > max_gif_nesting) { 292 log(LOG_NOTICE, 293 "gif_output: recursively called too many times(%d)\n", 294 called); 295 m_freem(m); 296 error = EIO; /* is there better errno? */ 297 goto end; 298 } 299 300 m->m_flags &= ~(M_BCAST|M_MCAST); 301 if (!(ifp->if_flags & IFF_UP) || 302 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 303 m_freem(m); 304 error = ENETDOWN; 305 goto end; 306 } 307 308 /* inner AF-specific encapsulation */ 309 switch (dst->sa_family) { 310 #ifdef ISO 311 case AF_ISO: 312 m = gif_eon_encap(m); 313 if (!m) { 314 error = ENOBUFS; 315 goto end; 316 } 317 break; 318 #endif 319 default: 320 break; 321 } 322 323 /* XXX should we check if our outer source is legal? */ 324 325 /* use DLT_NULL encapsulation here to pass inner af type */ 326 M_PREPEND(m, sizeof(int), M_DONTWAIT); 327 if (!m) { 328 error = ENOBUFS; 329 goto end; 330 } 331 *mtod(m, int *) = dst->sa_family; 332 333 s = splnet(); 334 IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error); 335 if (error) { 336 splx(s); 337 goto end; 338 } 339 splx(s); 340 341 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 342 softintr_schedule(sc->gif_si); 343 #else 344 /* XXX bad spl level? */ 345 gifnetisr(); 346 #endif 347 error = 0; 348 349 end: 350 called = 0; /* reset recursion counter */ 351 if (error) 352 ifp->if_oerrors++; 353 return error; 354 } 355 356 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 357 void 358 gifnetisr() 359 { 360 struct gif_softc *sc; 361 362 for (sc = LIST_FIRST(&gif_softc_list); sc != NULL; 363 sc = LIST_NEXT(sc, gif_list)) { 364 gifintr(sc); 365 } 366 } 367 #endif 368 369 void 370 gifintr(arg) 371 void *arg; 372 { 373 struct gif_softc *sc; 374 struct ifnet *ifp; 375 struct mbuf *m; 376 int family; 377 int len; 378 int s; 379 int error; 380 381 sc = (struct gif_softc *)arg; 382 ifp = &sc->gif_if; 383 384 /* output processing */ 385 while (1) { 386 s = splnet(); 387 IFQ_DEQUEUE(&sc->gif_if.if_snd, m); 388 splx(s); 389 if (m == NULL) 390 break; 391 392 /* grab and chop off inner af type */ 393 if (sizeof(int) > m->m_len) { 394 m = m_pullup(m, sizeof(int)); 395 if (!m) { 396 ifp->if_oerrors++; 397 continue; 398 } 399 } 400 family = *mtod(m, int *); 401 #if NBPFILTER > 0 402 if (ifp->if_bpf) 403 bpf_mtap(ifp->if_bpf, m); 404 #endif 405 m_adj(m, sizeof(int)); 406 407 len = m->m_pkthdr.len; 408 409 /* dispatch to output logic based on outer AF */ 410 switch (sc->gif_psrc->sa_family) { 411 #ifdef INET 412 case AF_INET: 413 error = in_gif_output(ifp, family, m); 414 break; 415 #endif 416 #ifdef INET6 417 case AF_INET6: 418 error = in6_gif_output(ifp, family, m); 419 break; 420 #endif 421 default: 422 m_freem(m); 423 error = ENETDOWN; 424 break; 425 } 426 427 if (error) 428 ifp->if_oerrors++; 429 else { 430 ifp->if_opackets++; 431 ifp->if_obytes += len; 432 } 433 } 434 } 435 436 void 437 gif_input(m, af, ifp) 438 struct mbuf *m; 439 int af; 440 struct ifnet *ifp; 441 { 442 int s, isr; 443 struct ifqueue *ifq = NULL; 444 445 if (ifp == NULL) { 446 /* just in case */ 447 m_freem(m); 448 return; 449 } 450 451 m->m_pkthdr.rcvif = ifp; 452 453 #if NBPFILTER > 0 454 if (ifp->if_bpf) 455 bpf_mtap_af(ifp->if_bpf, af, m); 456 #endif /*NBPFILTER > 0*/ 457 458 /* 459 * Put the packet to the network layer input queue according to the 460 * specified address family. 461 * Note: older versions of gif_input directly called network layer 462 * input functions, e.g. ip6_input, here. We changed the policy to 463 * prevent too many recursive calls of such input functions, which 464 * might cause kernel panic. But the change may introduce another 465 * problem; if the input queue is full, packets are discarded. 466 * The kernel stack overflow really happened, and we believed 467 * queue-full rarely occurs, so we changed the policy. 468 */ 469 switch (af) { 470 #ifdef INET 471 case AF_INET: 472 ifq = &ipintrq; 473 isr = NETISR_IP; 474 break; 475 #endif 476 #ifdef INET6 477 case AF_INET6: 478 ifq = &ip6intrq; 479 isr = NETISR_IPV6; 480 break; 481 #endif 482 #ifdef ISO 483 case AF_ISO: 484 m = gif_eon_decap(ifp, m); 485 if (!m) 486 return; 487 ifq = &clnlintrq; 488 isr = NETISR_ISO; 489 break; 490 #endif 491 default: 492 m_freem(m); 493 return; 494 } 495 496 s = splnet(); 497 if (IF_QFULL(ifq)) { 498 IF_DROP(ifq); /* update statistics */ 499 m_freem(m); 500 splx(s); 501 return; 502 } 503 ifp->if_ipackets++; 504 ifp->if_ibytes += m->m_pkthdr.len; 505 IF_ENQUEUE(ifq, m); 506 /* we need schednetisr since the address family may change */ 507 schednetisr(isr); 508 splx(s); 509 } 510 511 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 512 int 513 gif_ioctl(ifp, cmd, data) 514 struct ifnet *ifp; 515 u_long cmd; 516 caddr_t data; 517 { 518 struct proc *p = curproc; /* XXX */ 519 struct gif_softc *sc = (struct gif_softc*)ifp; 520 struct ifreq *ifr = (struct ifreq*)data; 521 int error = 0, size; 522 struct sockaddr *dst, *src; 523 #ifdef SIOCSIFMTU 524 u_long mtu; 525 #endif 526 527 switch (cmd) { 528 case SIOCSIFADDR: 529 ifp->if_flags |= IFF_UP; 530 break; 531 532 case SIOCSIFDSTADDR: 533 break; 534 535 case SIOCADDMULTI: 536 case SIOCDELMULTI: 537 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 538 break; 539 switch (ifr->ifr_addr.sa_family) { 540 #ifdef INET 541 case AF_INET: /* IP supports Multicast */ 542 break; 543 #endif /* INET */ 544 #ifdef INET6 545 case AF_INET6: /* IP6 supports Multicast */ 546 break; 547 #endif /* INET6 */ 548 default: /* Other protocols doesn't support Multicast */ 549 error = EAFNOSUPPORT; 550 break; 551 } 552 break; 553 554 #ifdef SIOCSIFMTU /* xxx */ 555 case SIOCGIFMTU: 556 break; 557 558 case SIOCSIFMTU: 559 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 560 break; 561 mtu = ifr->ifr_mtu; 562 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) 563 return (EINVAL); 564 ifp->if_mtu = mtu; 565 break; 566 #endif /* SIOCSIFMTU */ 567 568 #ifdef INET 569 case SIOCSIFPHYADDR: 570 #endif 571 #ifdef INET6 572 case SIOCSIFPHYADDR_IN6: 573 #endif /* INET6 */ 574 case SIOCSLIFPHYADDR: 575 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 576 break; 577 switch (cmd) { 578 #ifdef INET 579 case SIOCSIFPHYADDR: 580 src = (struct sockaddr *) 581 &(((struct in_aliasreq *)data)->ifra_addr); 582 dst = (struct sockaddr *) 583 &(((struct in_aliasreq *)data)->ifra_dstaddr); 584 break; 585 #endif 586 #ifdef INET6 587 case SIOCSIFPHYADDR_IN6: 588 src = (struct sockaddr *) 589 &(((struct in6_aliasreq *)data)->ifra_addr); 590 dst = (struct sockaddr *) 591 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 592 break; 593 #endif 594 case SIOCSLIFPHYADDR: 595 src = (struct sockaddr *) 596 &(((struct if_laddrreq *)data)->addr); 597 dst = (struct sockaddr *) 598 &(((struct if_laddrreq *)data)->dstaddr); 599 break; 600 default: 601 return EINVAL; 602 } 603 604 /* sa_family must be equal */ 605 if (src->sa_family != dst->sa_family) 606 return EINVAL; 607 608 /* validate sa_len */ 609 switch (src->sa_family) { 610 #ifdef INET 611 case AF_INET: 612 if (src->sa_len != sizeof(struct sockaddr_in)) 613 return EINVAL; 614 break; 615 #endif 616 #ifdef INET6 617 case AF_INET6: 618 if (src->sa_len != sizeof(struct sockaddr_in6)) 619 return EINVAL; 620 break; 621 #endif 622 default: 623 return EAFNOSUPPORT; 624 } 625 switch (dst->sa_family) { 626 #ifdef INET 627 case AF_INET: 628 if (dst->sa_len != sizeof(struct sockaddr_in)) 629 return EINVAL; 630 break; 631 #endif 632 #ifdef INET6 633 case AF_INET6: 634 if (dst->sa_len != sizeof(struct sockaddr_in6)) 635 return EINVAL; 636 break; 637 #endif 638 default: 639 return EAFNOSUPPORT; 640 } 641 642 /* check sa_family looks sane for the cmd */ 643 switch (cmd) { 644 case SIOCSIFPHYADDR: 645 if (src->sa_family == AF_INET) 646 break; 647 return EAFNOSUPPORT; 648 #ifdef INET6 649 case SIOCSIFPHYADDR_IN6: 650 if (src->sa_family == AF_INET6) 651 break; 652 return EAFNOSUPPORT; 653 #endif /* INET6 */ 654 case SIOCSLIFPHYADDR: 655 /* checks done in the above */ 656 break; 657 } 658 659 error = gif_set_tunnel(&sc->gif_if, src, dst); 660 break; 661 662 #ifdef SIOCDIFPHYADDR 663 case SIOCDIFPHYADDR: 664 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 665 break; 666 gif_delete_tunnel(&sc->gif_if); 667 break; 668 #endif 669 670 case SIOCGIFPSRCADDR: 671 #ifdef INET6 672 case SIOCGIFPSRCADDR_IN6: 673 #endif /* INET6 */ 674 if (sc->gif_psrc == NULL) { 675 error = EADDRNOTAVAIL; 676 goto bad; 677 } 678 src = sc->gif_psrc; 679 switch (cmd) { 680 #ifdef INET 681 case SIOCGIFPSRCADDR: 682 dst = &ifr->ifr_addr; 683 size = sizeof(ifr->ifr_addr); 684 break; 685 #endif /* INET */ 686 #ifdef INET6 687 case SIOCGIFPSRCADDR_IN6: 688 dst = (struct sockaddr *) 689 &(((struct in6_ifreq *)data)->ifr_addr); 690 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 691 break; 692 #endif /* INET6 */ 693 default: 694 error = EADDRNOTAVAIL; 695 goto bad; 696 } 697 if (src->sa_len > size) 698 return EINVAL; 699 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 700 break; 701 702 case SIOCGIFPDSTADDR: 703 #ifdef INET6 704 case SIOCGIFPDSTADDR_IN6: 705 #endif /* INET6 */ 706 if (sc->gif_pdst == NULL) { 707 error = EADDRNOTAVAIL; 708 goto bad; 709 } 710 src = sc->gif_pdst; 711 switch (cmd) { 712 #ifdef INET 713 case SIOCGIFPDSTADDR: 714 dst = &ifr->ifr_addr; 715 size = sizeof(ifr->ifr_addr); 716 break; 717 #endif /* INET */ 718 #ifdef INET6 719 case SIOCGIFPDSTADDR_IN6: 720 dst = (struct sockaddr *) 721 &(((struct in6_ifreq *)data)->ifr_addr); 722 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 723 break; 724 #endif /* INET6 */ 725 default: 726 error = EADDRNOTAVAIL; 727 goto bad; 728 } 729 if (src->sa_len > size) 730 return EINVAL; 731 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 732 break; 733 734 case SIOCGLIFPHYADDR: 735 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 736 error = EADDRNOTAVAIL; 737 goto bad; 738 } 739 740 /* copy src */ 741 src = sc->gif_psrc; 742 dst = (struct sockaddr *) 743 &(((struct if_laddrreq *)data)->addr); 744 size = sizeof(((struct if_laddrreq *)data)->addr); 745 if (src->sa_len > size) 746 return EINVAL; 747 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 748 749 /* copy dst */ 750 src = sc->gif_pdst; 751 dst = (struct sockaddr *) 752 &(((struct if_laddrreq *)data)->dstaddr); 753 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 754 if (src->sa_len > size) 755 return EINVAL; 756 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 757 break; 758 759 case SIOCSIFFLAGS: 760 /* if_ioctl() takes care of it */ 761 break; 762 763 default: 764 error = EINVAL; 765 break; 766 } 767 bad: 768 return error; 769 } 770 771 int 772 gif_set_tunnel(ifp, src, dst) 773 struct ifnet *ifp; 774 struct sockaddr *src; 775 struct sockaddr *dst; 776 { 777 struct gif_softc *sc = (struct gif_softc *)ifp; 778 struct gif_softc *sc2; 779 struct sockaddr *osrc, *odst, *sa; 780 int s; 781 int error; 782 783 s = splsoftnet(); 784 785 for (sc2 = LIST_FIRST(&gif_softc_list); sc2 != NULL; 786 sc2 = LIST_NEXT(sc2, gif_list)) { 787 if (sc2 == sc) 788 continue; 789 if (!sc2->gif_pdst || !sc2->gif_psrc) 790 continue; 791 if (sc2->gif_pdst->sa_family != dst->sa_family || 792 sc2->gif_pdst->sa_len != dst->sa_len || 793 sc2->gif_psrc->sa_family != src->sa_family || 794 sc2->gif_psrc->sa_len != src->sa_len) 795 continue; 796 /* can't configure same pair of address onto two gifs */ 797 if (bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 798 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 799 error = EADDRNOTAVAIL; 800 goto bad; 801 } 802 803 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 804 } 805 806 /* XXX we can detach from both, but be polite just in case */ 807 if (sc->gif_psrc) 808 switch (sc->gif_psrc->sa_family) { 809 #ifdef INET 810 case AF_INET: 811 (void)in_gif_detach(sc); 812 break; 813 #endif 814 #ifdef INET6 815 case AF_INET6: 816 (void)in6_gif_detach(sc); 817 break; 818 #endif 819 } 820 821 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 822 sc->gif_si = softintr_establish(IPL_SOFTNET, gifintr, sc); 823 if (sc->gif_si == NULL) { 824 error = ENOMEM; 825 goto bad; 826 } 827 #endif 828 829 osrc = sc->gif_psrc; 830 sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK); 831 bcopy((caddr_t)src, (caddr_t)sa, src->sa_len); 832 sc->gif_psrc = sa; 833 834 odst = sc->gif_pdst; 835 sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK); 836 bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len); 837 sc->gif_pdst = sa; 838 839 switch (sc->gif_psrc->sa_family) { 840 #ifdef INET 841 case AF_INET: 842 error = in_gif_attach(sc); 843 break; 844 #endif 845 #ifdef INET6 846 case AF_INET6: 847 error = in6_gif_attach(sc); 848 break; 849 #endif 850 default: 851 error = EINVAL; 852 break; 853 } 854 if (error) { 855 /* rollback */ 856 free((caddr_t)sc->gif_psrc, M_IFADDR); 857 free((caddr_t)sc->gif_pdst, M_IFADDR); 858 sc->gif_psrc = osrc; 859 sc->gif_pdst = odst; 860 goto bad; 861 } 862 863 if (osrc) 864 free((caddr_t)osrc, M_IFADDR); 865 if (odst) 866 free((caddr_t)odst, M_IFADDR); 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 return 0; 875 876 bad: 877 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 878 if (sc->gif_si) { 879 softintr_disestablish(sc->gif_si); 880 sc->gif_si = NULL; 881 } 882 #endif 883 if (sc->gif_psrc && sc->gif_pdst) 884 ifp->if_flags |= IFF_RUNNING; 885 else 886 ifp->if_flags &= ~IFF_RUNNING; 887 splx(s); 888 889 return error; 890 } 891 892 void 893 gif_delete_tunnel(ifp) 894 struct ifnet *ifp; 895 { 896 struct gif_softc *sc = (struct gif_softc *)ifp; 897 int s; 898 899 s = splsoftnet(); 900 901 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 902 if (sc->gif_si) { 903 softintr_disestablish(sc->gif_si); 904 sc->gif_si = NULL; 905 } 906 #endif 907 if (sc->gif_psrc) { 908 free((caddr_t)sc->gif_psrc, M_IFADDR); 909 sc->gif_psrc = NULL; 910 } 911 if (sc->gif_pdst) { 912 free((caddr_t)sc->gif_pdst, M_IFADDR); 913 sc->gif_pdst = NULL; 914 } 915 /* it is safe to detach from both */ 916 #ifdef INET 917 (void)in_gif_detach(sc); 918 #endif 919 #ifdef INET6 920 (void)in6_gif_detach(sc); 921 #endif 922 923 if (sc->gif_psrc && sc->gif_pdst) 924 ifp->if_flags |= IFF_RUNNING; 925 else 926 ifp->if_flags &= ~IFF_RUNNING; 927 splx(s); 928 } 929 930 #ifdef ISO 931 struct eonhdr { 932 u_int8_t version; 933 u_int8_t class; 934 u_int16_t cksum; 935 }; 936 937 /* 938 * prepend EON header to ISO PDU 939 */ 940 static struct mbuf * 941 gif_eon_encap(struct mbuf *m) 942 { 943 struct eonhdr *ehdr; 944 945 M_PREPEND(m, sizeof(*ehdr), M_DONTWAIT); 946 if (m && m->m_len < sizeof(*ehdr)) 947 m = m_pullup(m, sizeof(*ehdr)); 948 if (m == NULL) 949 return NULL; 950 ehdr = mtod(m, struct eonhdr *); 951 ehdr->version = 1; 952 ehdr->class = 0; /* always unicast */ 953 #if 0 954 /* calculate the checksum of the eonhdr */ 955 { 956 struct mbuf mhead; 957 memset(&mhead, 0, sizeof(mhead)); 958 ehdr->cksum = 0; 959 mhead.m_data = (caddr_t)ehdr; 960 mhead.m_len = sizeof(*ehdr); 961 mhead.m_next = 0; 962 iso_gen_csum(&mhead, offsetof(struct eonhdr, cksum), 963 mhead.m_len); 964 } 965 #else 966 /* since the data is always constant we'll just plug the value in */ 967 ehdr->cksum = htons(0xfc02); 968 #endif 969 return m; 970 } 971 972 /* 973 * remove EON header and check checksum 974 */ 975 static struct mbuf * 976 gif_eon_decap(struct ifnet *ifp, struct mbuf *m) 977 { 978 struct eonhdr *ehdr; 979 980 if (m->m_len < sizeof(*ehdr) && 981 (m = m_pullup(m, sizeof(*ehdr))) == NULL) { 982 ifp->if_ierrors++; 983 return NULL; 984 } 985 if (iso_check_csum(m, sizeof(struct eonhdr))) { 986 m_freem(m); 987 return NULL; 988 } 989 m_adj(m, sizeof(*ehdr)); 990 return m; 991 } 992 #endif /*ISO*/ 993
Indexes created Wed Sep 24 15:09:51 GMT 2025