if_gif.c revision 1.47
1 /* $NetBSD: if_gif.c,v 1.47 2004/12/04 18:31:43 peter 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 1.47 2004/12/04 18:31:43 peter 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 int 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 int 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 return (0); 199 } 200 201 #ifdef GIF_ENCAPCHECK 202 int 203 gif_encapcheck(m, off, proto, arg) 204 const struct mbuf *m; 205 int off; 206 int proto; 207 void *arg; 208 { 209 struct ip ip; 210 struct gif_softc *sc; 211 212 sc = (struct gif_softc *)arg; 213 if (sc == NULL) 214 return 0; 215 216 if ((sc->gif_if.if_flags & IFF_UP) == 0) 217 return 0; 218 219 /* no physical address */ 220 if (!sc->gif_psrc || !sc->gif_pdst) 221 return 0; 222 223 switch (proto) { 224 #ifdef INET 225 case IPPROTO_IPV4: 226 break; 227 #endif 228 #ifdef INET6 229 case IPPROTO_IPV6: 230 break; 231 #endif 232 #ifdef ISO 233 case IPPROTO_EON: 234 break; 235 #endif 236 default: 237 return 0; 238 } 239 240 /* Bail on short packets */ 241 KASSERT(m->m_flags & M_PKTHDR); 242 if (m->m_pkthdr.len < sizeof(ip)) 243 return 0; 244 245 /* LINTED const cast */ 246 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); 247 248 switch (ip.ip_v) { 249 #ifdef INET 250 case 4: 251 if (sc->gif_psrc->sa_family != AF_INET || 252 sc->gif_pdst->sa_family != AF_INET) 253 return 0; 254 return gif_encapcheck4(m, off, proto, arg); 255 #endif 256 #ifdef INET6 257 case 6: 258 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) 259 return 0; 260 if (sc->gif_psrc->sa_family != AF_INET6 || 261 sc->gif_pdst->sa_family != AF_INET6) 262 return 0; 263 return gif_encapcheck6(m, off, proto, arg); 264 #endif 265 default: 266 return 0; 267 } 268 } 269 #endif 270 271 int 272 gif_output(ifp, m, dst, rt) 273 struct ifnet *ifp; 274 struct mbuf *m; 275 struct sockaddr *dst; 276 struct rtentry *rt; /* added in net2 */ 277 { 278 struct gif_softc *sc = (struct gif_softc*)ifp; 279 int error = 0; 280 static int called = 0; /* XXX: MUTEX */ 281 ALTQ_DECL(struct altq_pktattr pktattr;) 282 int s; 283 284 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 285 286 /* 287 * gif may cause infinite recursion calls when misconfigured. 288 * We'll prevent this by introducing upper limit. 289 * XXX: this mechanism may introduce another problem about 290 * mutual exclusion of the variable CALLED, especially if we 291 * use kernel thread. 292 */ 293 if (++called > max_gif_nesting) { 294 log(LOG_NOTICE, 295 "gif_output: recursively called too many times(%d)\n", 296 called); 297 m_freem(m); 298 error = EIO; /* is there better errno? */ 299 goto end; 300 } 301 302 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 /* inner AF-specific encapsulation */ 311 switch (dst->sa_family) { 312 #ifdef ISO 313 case AF_ISO: 314 m = gif_eon_encap(m); 315 if (!m) { 316 error = ENOBUFS; 317 goto end; 318 } 319 break; 320 #endif 321 default: 322 break; 323 } 324 325 /* XXX should we check if our outer source is legal? */ 326 327 /* use DLT_NULL encapsulation here to pass inner af type */ 328 M_PREPEND(m, sizeof(int), M_DONTWAIT); 329 if (!m) { 330 error = ENOBUFS; 331 goto end; 332 } 333 *mtod(m, int *) = dst->sa_family; 334 335 s = splnet(); 336 IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error); 337 if (error) { 338 splx(s); 339 goto end; 340 } 341 splx(s); 342 343 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 344 softintr_schedule(sc->gif_si); 345 #else 346 /* XXX bad spl level? */ 347 gifnetisr(); 348 #endif 349 error = 0; 350 351 end: 352 called = 0; /* reset recursion counter */ 353 if (error) 354 ifp->if_oerrors++; 355 return error; 356 } 357 358 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 359 void 360 gifnetisr() 361 { 362 struct gif_softc *sc; 363 364 for (sc = LIST_FIRST(&gif_softc_list); sc != NULL; 365 sc = LIST_NEXT(sc, gif_list)) { 366 gifintr(sc); 367 } 368 } 369 #endif 370 371 void 372 gifintr(arg) 373 void *arg; 374 { 375 struct gif_softc *sc; 376 struct ifnet *ifp; 377 struct mbuf *m; 378 int family; 379 int len; 380 int s; 381 int error; 382 383 sc = (struct gif_softc *)arg; 384 ifp = &sc->gif_if; 385 386 /* output processing */ 387 while (1) { 388 s = splnet(); 389 IFQ_DEQUEUE(&sc->gif_if.if_snd, m); 390 splx(s); 391 if (m == NULL) 392 break; 393 394 /* grab and chop off inner af type */ 395 if (sizeof(int) > m->m_len) { 396 m = m_pullup(m, sizeof(int)); 397 if (!m) { 398 ifp->if_oerrors++; 399 continue; 400 } 401 } 402 family = *mtod(m, int *); 403 #if NBPFILTER > 0 404 if (ifp->if_bpf) 405 bpf_mtap(ifp->if_bpf, m); 406 #endif 407 m_adj(m, sizeof(int)); 408 409 len = m->m_pkthdr.len; 410 411 /* dispatch to output logic based on outer AF */ 412 switch (sc->gif_psrc->sa_family) { 413 #ifdef INET 414 case AF_INET: 415 error = in_gif_output(ifp, family, m); 416 break; 417 #endif 418 #ifdef INET6 419 case AF_INET6: 420 error = in6_gif_output(ifp, family, m); 421 break; 422 #endif 423 default: 424 m_freem(m); 425 error = ENETDOWN; 426 break; 427 } 428 429 if (error) 430 ifp->if_oerrors++; 431 else { 432 ifp->if_opackets++; 433 ifp->if_obytes += len; 434 } 435 } 436 } 437 438 void 439 gif_input(m, af, ifp) 440 struct mbuf *m; 441 int af; 442 struct ifnet *ifp; 443 { 444 int s, isr; 445 struct ifqueue *ifq = NULL; 446 447 if (ifp == NULL) { 448 /* just in case */ 449 m_freem(m); 450 return; 451 } 452 453 m->m_pkthdr.rcvif = ifp; 454 455 #if NBPFILTER > 0 456 if (ifp->if_bpf) 457 bpf_mtap_af(ifp->if_bpf, af, m); 458 #endif /*NBPFILTER > 0*/ 459 460 /* 461 * Put the packet to the network layer input queue according to the 462 * specified address family. 463 * Note: older versions of gif_input directly called network layer 464 * input functions, e.g. ip6_input, here. We changed the policy to 465 * prevent too many recursive calls of such input functions, which 466 * might cause kernel panic. But the change may introduce another 467 * problem; if the input queue is full, packets are discarded. 468 * The kernel stack overflow really happened, and we believed 469 * queue-full rarely occurs, so we changed the policy. 470 */ 471 switch (af) { 472 #ifdef INET 473 case AF_INET: 474 ifq = &ipintrq; 475 isr = NETISR_IP; 476 break; 477 #endif 478 #ifdef INET6 479 case AF_INET6: 480 ifq = &ip6intrq; 481 isr = NETISR_IPV6; 482 break; 483 #endif 484 #ifdef ISO 485 case AF_ISO: 486 m = gif_eon_decap(ifp, m); 487 if (!m) 488 return; 489 ifq = &clnlintrq; 490 isr = NETISR_ISO; 491 break; 492 #endif 493 default: 494 m_freem(m); 495 return; 496 } 497 498 s = splnet(); 499 if (IF_QFULL(ifq)) { 500 IF_DROP(ifq); /* update statistics */ 501 m_freem(m); 502 splx(s); 503 return; 504 } 505 ifp->if_ipackets++; 506 ifp->if_ibytes += m->m_pkthdr.len; 507 IF_ENQUEUE(ifq, m); 508 /* we need schednetisr since the address family may change */ 509 schednetisr(isr); 510 splx(s); 511 } 512 513 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 514 int 515 gif_ioctl(ifp, cmd, data) 516 struct ifnet *ifp; 517 u_long cmd; 518 caddr_t data; 519 { 520 struct proc *p = curproc; /* XXX */ 521 struct gif_softc *sc = (struct gif_softc*)ifp; 522 struct ifreq *ifr = (struct ifreq*)data; 523 int error = 0, size; 524 struct sockaddr *dst, *src; 525 #ifdef SIOCSIFMTU 526 u_long mtu; 527 #endif 528 529 switch (cmd) { 530 case SIOCSIFADDR: 531 ifp->if_flags |= IFF_UP; 532 break; 533 534 case SIOCSIFDSTADDR: 535 break; 536 537 case SIOCADDMULTI: 538 case SIOCDELMULTI: 539 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 540 break; 541 switch (ifr->ifr_addr.sa_family) { 542 #ifdef INET 543 case AF_INET: /* IP supports Multicast */ 544 break; 545 #endif /* INET */ 546 #ifdef INET6 547 case AF_INET6: /* IP6 supports Multicast */ 548 break; 549 #endif /* INET6 */ 550 default: /* Other protocols doesn't support Multicast */ 551 error = EAFNOSUPPORT; 552 break; 553 } 554 break; 555 556 #ifdef SIOCSIFMTU /* xxx */ 557 case SIOCGIFMTU: 558 break; 559 560 case SIOCSIFMTU: 561 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 562 break; 563 mtu = ifr->ifr_mtu; 564 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) 565 return (EINVAL); 566 ifp->if_mtu = mtu; 567 break; 568 #endif /* SIOCSIFMTU */ 569 570 #ifdef INET 571 case SIOCSIFPHYADDR: 572 #endif 573 #ifdef INET6 574 case SIOCSIFPHYADDR_IN6: 575 #endif /* INET6 */ 576 case SIOCSLIFPHYADDR: 577 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 578 break; 579 switch (cmd) { 580 #ifdef INET 581 case SIOCSIFPHYADDR: 582 src = (struct sockaddr *) 583 &(((struct in_aliasreq *)data)->ifra_addr); 584 dst = (struct sockaddr *) 585 &(((struct in_aliasreq *)data)->ifra_dstaddr); 586 break; 587 #endif 588 #ifdef INET6 589 case SIOCSIFPHYADDR_IN6: 590 src = (struct sockaddr *) 591 &(((struct in6_aliasreq *)data)->ifra_addr); 592 dst = (struct sockaddr *) 593 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 594 break; 595 #endif 596 case SIOCSLIFPHYADDR: 597 src = (struct sockaddr *) 598 &(((struct if_laddrreq *)data)->addr); 599 dst = (struct sockaddr *) 600 &(((struct if_laddrreq *)data)->dstaddr); 601 break; 602 default: 603 return EINVAL; 604 } 605 606 /* sa_family must be equal */ 607 if (src->sa_family != dst->sa_family) 608 return EINVAL; 609 610 /* validate sa_len */ 611 switch (src->sa_family) { 612 #ifdef INET 613 case AF_INET: 614 if (src->sa_len != sizeof(struct sockaddr_in)) 615 return EINVAL; 616 break; 617 #endif 618 #ifdef INET6 619 case AF_INET6: 620 if (src->sa_len != sizeof(struct sockaddr_in6)) 621 return EINVAL; 622 break; 623 #endif 624 default: 625 return EAFNOSUPPORT; 626 } 627 switch (dst->sa_family) { 628 #ifdef INET 629 case AF_INET: 630 if (dst->sa_len != sizeof(struct sockaddr_in)) 631 return EINVAL; 632 break; 633 #endif 634 #ifdef INET6 635 case AF_INET6: 636 if (dst->sa_len != sizeof(struct sockaddr_in6)) 637 return EINVAL; 638 break; 639 #endif 640 default: 641 return EAFNOSUPPORT; 642 } 643 644 /* check sa_family looks sane for the cmd */ 645 switch (cmd) { 646 case SIOCSIFPHYADDR: 647 if (src->sa_family == AF_INET) 648 break; 649 return EAFNOSUPPORT; 650 #ifdef INET6 651 case SIOCSIFPHYADDR_IN6: 652 if (src->sa_family == AF_INET6) 653 break; 654 return EAFNOSUPPORT; 655 #endif /* INET6 */ 656 case SIOCSLIFPHYADDR: 657 /* checks done in the above */ 658 break; 659 } 660 661 error = gif_set_tunnel(&sc->gif_if, src, dst); 662 break; 663 664 #ifdef SIOCDIFPHYADDR 665 case SIOCDIFPHYADDR: 666 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 667 break; 668 gif_delete_tunnel(&sc->gif_if); 669 break; 670 #endif 671 672 case SIOCGIFPSRCADDR: 673 #ifdef INET6 674 case SIOCGIFPSRCADDR_IN6: 675 #endif /* INET6 */ 676 if (sc->gif_psrc == NULL) { 677 error = EADDRNOTAVAIL; 678 goto bad; 679 } 680 src = sc->gif_psrc; 681 switch (cmd) { 682 #ifdef INET 683 case SIOCGIFPSRCADDR: 684 dst = &ifr->ifr_addr; 685 size = sizeof(ifr->ifr_addr); 686 break; 687 #endif /* INET */ 688 #ifdef INET6 689 case SIOCGIFPSRCADDR_IN6: 690 dst = (struct sockaddr *) 691 &(((struct in6_ifreq *)data)->ifr_addr); 692 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 693 break; 694 #endif /* INET6 */ 695 default: 696 error = EADDRNOTAVAIL; 697 goto bad; 698 } 699 if (src->sa_len > size) 700 return EINVAL; 701 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 702 break; 703 704 case SIOCGIFPDSTADDR: 705 #ifdef INET6 706 case SIOCGIFPDSTADDR_IN6: 707 #endif /* INET6 */ 708 if (sc->gif_pdst == NULL) { 709 error = EADDRNOTAVAIL; 710 goto bad; 711 } 712 src = sc->gif_pdst; 713 switch (cmd) { 714 #ifdef INET 715 case SIOCGIFPDSTADDR: 716 dst = &ifr->ifr_addr; 717 size = sizeof(ifr->ifr_addr); 718 break; 719 #endif /* INET */ 720 #ifdef INET6 721 case SIOCGIFPDSTADDR_IN6: 722 dst = (struct sockaddr *) 723 &(((struct in6_ifreq *)data)->ifr_addr); 724 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 725 break; 726 #endif /* INET6 */ 727 default: 728 error = EADDRNOTAVAIL; 729 goto bad; 730 } 731 if (src->sa_len > size) 732 return EINVAL; 733 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 734 break; 735 736 case SIOCGLIFPHYADDR: 737 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 738 error = EADDRNOTAVAIL; 739 goto bad; 740 } 741 742 /* copy src */ 743 src = sc->gif_psrc; 744 dst = (struct sockaddr *) 745 &(((struct if_laddrreq *)data)->addr); 746 size = sizeof(((struct if_laddrreq *)data)->addr); 747 if (src->sa_len > size) 748 return EINVAL; 749 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 750 751 /* copy dst */ 752 src = sc->gif_pdst; 753 dst = (struct sockaddr *) 754 &(((struct if_laddrreq *)data)->dstaddr); 755 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 756 if (src->sa_len > size) 757 return EINVAL; 758 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 759 break; 760 761 case SIOCSIFFLAGS: 762 /* if_ioctl() takes care of it */ 763 break; 764 765 default: 766 error = EINVAL; 767 break; 768 } 769 bad: 770 return error; 771 } 772 773 int 774 gif_set_tunnel(ifp, src, dst) 775 struct ifnet *ifp; 776 struct sockaddr *src; 777 struct sockaddr *dst; 778 { 779 struct gif_softc *sc = (struct gif_softc *)ifp; 780 struct gif_softc *sc2; 781 struct sockaddr *osrc, *odst, *sa; 782 int s; 783 int error; 784 785 s = splsoftnet(); 786 787 for (sc2 = LIST_FIRST(&gif_softc_list); sc2 != NULL; 788 sc2 = LIST_NEXT(sc2, gif_list)) { 789 if (sc2 == sc) 790 continue; 791 if (!sc2->gif_pdst || !sc2->gif_psrc) 792 continue; 793 if (sc2->gif_pdst->sa_family != dst->sa_family || 794 sc2->gif_pdst->sa_len != dst->sa_len || 795 sc2->gif_psrc->sa_family != src->sa_family || 796 sc2->gif_psrc->sa_len != src->sa_len) 797 continue; 798 /* can't configure same pair of address onto two gifs */ 799 if (bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 800 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 801 error = EADDRNOTAVAIL; 802 goto bad; 803 } 804 805 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 806 } 807 808 /* XXX we can detach from both, but be polite just in case */ 809 if (sc->gif_psrc) 810 switch (sc->gif_psrc->sa_family) { 811 #ifdef INET 812 case AF_INET: 813 (void)in_gif_detach(sc); 814 break; 815 #endif 816 #ifdef INET6 817 case AF_INET6: 818 (void)in6_gif_detach(sc); 819 break; 820 #endif 821 } 822 823 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 824 sc->gif_si = softintr_establish(IPL_SOFTNET, gifintr, sc); 825 if (sc->gif_si == NULL) { 826 error = ENOMEM; 827 goto bad; 828 } 829 #endif 830 831 osrc = sc->gif_psrc; 832 sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK); 833 bcopy((caddr_t)src, (caddr_t)sa, src->sa_len); 834 sc->gif_psrc = sa; 835 836 odst = sc->gif_pdst; 837 sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK); 838 bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len); 839 sc->gif_pdst = sa; 840 841 switch (sc->gif_psrc->sa_family) { 842 #ifdef INET 843 case AF_INET: 844 error = in_gif_attach(sc); 845 break; 846 #endif 847 #ifdef INET6 848 case AF_INET6: 849 error = in6_gif_attach(sc); 850 break; 851 #endif 852 default: 853 error = EINVAL; 854 break; 855 } 856 if (error) { 857 /* rollback */ 858 free((caddr_t)sc->gif_psrc, M_IFADDR); 859 free((caddr_t)sc->gif_pdst, M_IFADDR); 860 sc->gif_psrc = osrc; 861 sc->gif_pdst = odst; 862 goto bad; 863 } 864 865 if (osrc) 866 free((caddr_t)osrc, M_IFADDR); 867 if (odst) 868 free((caddr_t)odst, M_IFADDR); 869 870 if (sc->gif_psrc && sc->gif_pdst) 871 ifp->if_flags |= IFF_RUNNING; 872 else 873 ifp->if_flags &= ~IFF_RUNNING; 874 splx(s); 875 876 return 0; 877 878 bad: 879 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 880 if (sc->gif_si) { 881 softintr_disestablish(sc->gif_si); 882 sc->gif_si = NULL; 883 } 884 #endif 885 if (sc->gif_psrc && sc->gif_pdst) 886 ifp->if_flags |= IFF_RUNNING; 887 else 888 ifp->if_flags &= ~IFF_RUNNING; 889 splx(s); 890 891 return error; 892 } 893 894 void 895 gif_delete_tunnel(ifp) 896 struct ifnet *ifp; 897 { 898 struct gif_softc *sc = (struct gif_softc *)ifp; 899 int s; 900 901 s = splsoftnet(); 902 903 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 904 if (sc->gif_si) { 905 softintr_disestablish(sc->gif_si); 906 sc->gif_si = NULL; 907 } 908 #endif 909 if (sc->gif_psrc) { 910 free((caddr_t)sc->gif_psrc, M_IFADDR); 911 sc->gif_psrc = NULL; 912 } 913 if (sc->gif_pdst) { 914 free((caddr_t)sc->gif_pdst, M_IFADDR); 915 sc->gif_pdst = NULL; 916 } 917 /* it is safe to detach from both */ 918 #ifdef INET 919 (void)in_gif_detach(sc); 920 #endif 921 #ifdef INET6 922 (void)in6_gif_detach(sc); 923 #endif 924 925 if (sc->gif_psrc && sc->gif_pdst) 926 ifp->if_flags |= IFF_RUNNING; 927 else 928 ifp->if_flags &= ~IFF_RUNNING; 929 splx(s); 930 } 931 932 #ifdef ISO 933 struct eonhdr { 934 u_int8_t version; 935 u_int8_t class; 936 u_int16_t cksum; 937 }; 938 939 /* 940 * prepend EON header to ISO PDU 941 */ 942 static struct mbuf * 943 gif_eon_encap(struct mbuf *m) 944 { 945 struct eonhdr *ehdr; 946 947 M_PREPEND(m, sizeof(*ehdr), M_DONTWAIT); 948 if (m && m->m_len < sizeof(*ehdr)) 949 m = m_pullup(m, sizeof(*ehdr)); 950 if (m == NULL) 951 return NULL; 952 ehdr = mtod(m, struct eonhdr *); 953 ehdr->version = 1; 954 ehdr->class = 0; /* always unicast */ 955 #if 0 956 /* calculate the checksum of the eonhdr */ 957 { 958 struct mbuf mhead; 959 memset(&mhead, 0, sizeof(mhead)); 960 ehdr->cksum = 0; 961 mhead.m_data = (caddr_t)ehdr; 962 mhead.m_len = sizeof(*ehdr); 963 mhead.m_next = 0; 964 iso_gen_csum(&mhead, offsetof(struct eonhdr, cksum), 965 mhead.m_len); 966 } 967 #else 968 /* since the data is always constant we'll just plug the value in */ 969 ehdr->cksum = htons(0xfc02); 970 #endif 971 return m; 972 } 973 974 /* 975 * remove EON header and check checksum 976 */ 977 static struct mbuf * 978 gif_eon_decap(struct ifnet *ifp, struct mbuf *m) 979 { 980 struct eonhdr *ehdr; 981 982 if (m->m_len < sizeof(*ehdr) && 983 (m = m_pullup(m, sizeof(*ehdr))) == NULL) { 984 ifp->if_ierrors++; 985 return NULL; 986 } 987 if (iso_check_csum(m, sizeof(struct eonhdr))) { 988 m_freem(m); 989 return NULL; 990 } 991 m_adj(m, sizeof(*ehdr)); 992 return m; 993 } 994 #endif /*ISO*/ 995
Indexes created Tue Sep 30 07:10:03 GMT 2025