if_gif.c revision 1.45
1 /* $NetBSD: if_gif.c,v 1.45 2004/04/21 18:40:38 itojun 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 1.45 2004/04/21 18:40:38 itojun 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 #ifdef HAVE_OLD_BPF 404 bpf_mtap(ifp, m); 405 #else 406 bpf_mtap(ifp->if_bpf, m); 407 #endif 408 } 409 #endif 410 m_adj(m, sizeof(int)); 411 412 len = m->m_pkthdr.len; 413 414 /* dispatch to output logic based on outer AF */ 415 switch (sc->gif_psrc->sa_family) { 416 #ifdef INET 417 case AF_INET: 418 error = in_gif_output(ifp, family, m); 419 break; 420 #endif 421 #ifdef INET6 422 case AF_INET6: 423 error = in6_gif_output(ifp, family, m); 424 break; 425 #endif 426 default: 427 m_freem(m); 428 error = ENETDOWN; 429 break; 430 } 431 432 if (error) 433 ifp->if_oerrors++; 434 else { 435 ifp->if_opackets++; 436 ifp->if_obytes += len; 437 } 438 } 439 } 440 441 void 442 gif_input(m, af, ifp) 443 struct mbuf *m; 444 int af; 445 struct ifnet *ifp; 446 { 447 int s, isr; 448 struct ifqueue *ifq = NULL; 449 450 if (ifp == NULL) { 451 /* just in case */ 452 m_freem(m); 453 return; 454 } 455 456 m->m_pkthdr.rcvif = ifp; 457 458 #if NBPFILTER > 0 459 if (ifp->if_bpf) { 460 /* 461 * We need to prepend the address family as 462 * a four byte field. Cons up a dummy header 463 * to pacify bpf. This is safe because bpf 464 * will only read from the mbuf (i.e., it won't 465 * try to free it or keep a pointer a to it). 466 */ 467 struct mbuf m0; 468 u_int32_t af1 = af; 469 470 m0.m_next = m; 471 m0.m_len = 4; 472 m0.m_data = (char *)&af1; 473 474 #ifdef HAVE_OLD_BPF 475 bpf_mtap(ifp, &m0); 476 #else 477 bpf_mtap(ifp->if_bpf, &m0); 478 #endif 479 } 480 #endif /*NBPFILTER > 0*/ 481 482 /* 483 * Put the packet to the network layer input queue according to the 484 * specified address family. 485 * Note: older versions of gif_input directly called network layer 486 * input functions, e.g. ip6_input, here. We changed the policy to 487 * prevent too many recursive calls of such input functions, which 488 * might cause kernel panic. But the change may introduce another 489 * problem; if the input queue is full, packets are discarded. 490 * The kernel stack overflow really happened, and we believed 491 * queue-full rarely occurs, so we changed the policy. 492 */ 493 switch (af) { 494 #ifdef INET 495 case AF_INET: 496 ifq = &ipintrq; 497 isr = NETISR_IP; 498 break; 499 #endif 500 #ifdef INET6 501 case AF_INET6: 502 ifq = &ip6intrq; 503 isr = NETISR_IPV6; 504 break; 505 #endif 506 #ifdef ISO 507 case AF_ISO: 508 m = gif_eon_decap(ifp, m); 509 if (!m) 510 return; 511 ifq = &clnlintrq; 512 isr = NETISR_ISO; 513 break; 514 #endif 515 default: 516 m_freem(m); 517 return; 518 } 519 520 s = splnet(); 521 if (IF_QFULL(ifq)) { 522 IF_DROP(ifq); /* update statistics */ 523 m_freem(m); 524 splx(s); 525 return; 526 } 527 ifp->if_ipackets++; 528 ifp->if_ibytes += m->m_pkthdr.len; 529 IF_ENQUEUE(ifq, m); 530 /* we need schednetisr since the address family may change */ 531 schednetisr(isr); 532 splx(s); 533 } 534 535 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 536 int 537 gif_ioctl(ifp, cmd, data) 538 struct ifnet *ifp; 539 u_long cmd; 540 caddr_t data; 541 { 542 struct proc *p = curproc; /* XXX */ 543 struct gif_softc *sc = (struct gif_softc*)ifp; 544 struct ifreq *ifr = (struct ifreq*)data; 545 int error = 0, size; 546 struct sockaddr *dst, *src; 547 #ifdef SIOCSIFMTU 548 u_long mtu; 549 #endif 550 551 switch (cmd) { 552 case SIOCSIFADDR: 553 ifp->if_flags |= IFF_UP; 554 break; 555 556 case SIOCSIFDSTADDR: 557 break; 558 559 case SIOCADDMULTI: 560 case SIOCDELMULTI: 561 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 562 break; 563 switch (ifr->ifr_addr.sa_family) { 564 #ifdef INET 565 case AF_INET: /* IP supports Multicast */ 566 break; 567 #endif /* INET */ 568 #ifdef INET6 569 case AF_INET6: /* IP6 supports Multicast */ 570 break; 571 #endif /* INET6 */ 572 default: /* Other protocols doesn't support Multicast */ 573 error = EAFNOSUPPORT; 574 break; 575 } 576 break; 577 578 #ifdef SIOCSIFMTU /* xxx */ 579 case SIOCGIFMTU: 580 break; 581 582 case SIOCSIFMTU: 583 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 584 break; 585 mtu = ifr->ifr_mtu; 586 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) 587 return (EINVAL); 588 ifp->if_mtu = mtu; 589 break; 590 #endif /* SIOCSIFMTU */ 591 592 #ifdef INET 593 case SIOCSIFPHYADDR: 594 #endif 595 #ifdef INET6 596 case SIOCSIFPHYADDR_IN6: 597 #endif /* INET6 */ 598 case SIOCSLIFPHYADDR: 599 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 600 break; 601 switch (cmd) { 602 #ifdef INET 603 case SIOCSIFPHYADDR: 604 src = (struct sockaddr *) 605 &(((struct in_aliasreq *)data)->ifra_addr); 606 dst = (struct sockaddr *) 607 &(((struct in_aliasreq *)data)->ifra_dstaddr); 608 break; 609 #endif 610 #ifdef INET6 611 case SIOCSIFPHYADDR_IN6: 612 src = (struct sockaddr *) 613 &(((struct in6_aliasreq *)data)->ifra_addr); 614 dst = (struct sockaddr *) 615 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 616 break; 617 #endif 618 case SIOCSLIFPHYADDR: 619 src = (struct sockaddr *) 620 &(((struct if_laddrreq *)data)->addr); 621 dst = (struct sockaddr *) 622 &(((struct if_laddrreq *)data)->dstaddr); 623 break; 624 default: 625 return EINVAL; 626 } 627 628 /* sa_family must be equal */ 629 if (src->sa_family != dst->sa_family) 630 return EINVAL; 631 632 /* validate sa_len */ 633 switch (src->sa_family) { 634 #ifdef INET 635 case AF_INET: 636 if (src->sa_len != sizeof(struct sockaddr_in)) 637 return EINVAL; 638 break; 639 #endif 640 #ifdef INET6 641 case AF_INET6: 642 if (src->sa_len != sizeof(struct sockaddr_in6)) 643 return EINVAL; 644 break; 645 #endif 646 default: 647 return EAFNOSUPPORT; 648 } 649 switch (dst->sa_family) { 650 #ifdef INET 651 case AF_INET: 652 if (dst->sa_len != sizeof(struct sockaddr_in)) 653 return EINVAL; 654 break; 655 #endif 656 #ifdef INET6 657 case AF_INET6: 658 if (dst->sa_len != sizeof(struct sockaddr_in6)) 659 return EINVAL; 660 break; 661 #endif 662 default: 663 return EAFNOSUPPORT; 664 } 665 666 /* check sa_family looks sane for the cmd */ 667 switch (cmd) { 668 case SIOCSIFPHYADDR: 669 if (src->sa_family == AF_INET) 670 break; 671 return EAFNOSUPPORT; 672 #ifdef INET6 673 case SIOCSIFPHYADDR_IN6: 674 if (src->sa_family == AF_INET6) 675 break; 676 return EAFNOSUPPORT; 677 #endif /* INET6 */ 678 case SIOCSLIFPHYADDR: 679 /* checks done in the above */ 680 break; 681 } 682 683 error = gif_set_tunnel(&sc->gif_if, src, dst); 684 break; 685 686 #ifdef SIOCDIFPHYADDR 687 case SIOCDIFPHYADDR: 688 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 689 break; 690 gif_delete_tunnel(&sc->gif_if); 691 break; 692 #endif 693 694 case SIOCGIFPSRCADDR: 695 #ifdef INET6 696 case SIOCGIFPSRCADDR_IN6: 697 #endif /* INET6 */ 698 if (sc->gif_psrc == NULL) { 699 error = EADDRNOTAVAIL; 700 goto bad; 701 } 702 src = sc->gif_psrc; 703 switch (cmd) { 704 #ifdef INET 705 case SIOCGIFPSRCADDR: 706 dst = &ifr->ifr_addr; 707 size = sizeof(ifr->ifr_addr); 708 break; 709 #endif /* INET */ 710 #ifdef INET6 711 case SIOCGIFPSRCADDR_IN6: 712 dst = (struct sockaddr *) 713 &(((struct in6_ifreq *)data)->ifr_addr); 714 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 715 break; 716 #endif /* INET6 */ 717 default: 718 error = EADDRNOTAVAIL; 719 goto bad; 720 } 721 if (src->sa_len > size) 722 return EINVAL; 723 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 724 break; 725 726 case SIOCGIFPDSTADDR: 727 #ifdef INET6 728 case SIOCGIFPDSTADDR_IN6: 729 #endif /* INET6 */ 730 if (sc->gif_pdst == NULL) { 731 error = EADDRNOTAVAIL; 732 goto bad; 733 } 734 src = sc->gif_pdst; 735 switch (cmd) { 736 #ifdef INET 737 case SIOCGIFPDSTADDR: 738 dst = &ifr->ifr_addr; 739 size = sizeof(ifr->ifr_addr); 740 break; 741 #endif /* INET */ 742 #ifdef INET6 743 case SIOCGIFPDSTADDR_IN6: 744 dst = (struct sockaddr *) 745 &(((struct in6_ifreq *)data)->ifr_addr); 746 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 747 break; 748 #endif /* INET6 */ 749 default: 750 error = EADDRNOTAVAIL; 751 goto bad; 752 } 753 if (src->sa_len > size) 754 return EINVAL; 755 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 756 break; 757 758 case SIOCGLIFPHYADDR: 759 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 760 error = EADDRNOTAVAIL; 761 goto bad; 762 } 763 764 /* copy src */ 765 src = sc->gif_psrc; 766 dst = (struct sockaddr *) 767 &(((struct if_laddrreq *)data)->addr); 768 size = sizeof(((struct if_laddrreq *)data)->addr); 769 if (src->sa_len > size) 770 return EINVAL; 771 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 772 773 /* copy dst */ 774 src = sc->gif_pdst; 775 dst = (struct sockaddr *) 776 &(((struct if_laddrreq *)data)->dstaddr); 777 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 778 if (src->sa_len > size) 779 return EINVAL; 780 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 781 break; 782 783 case SIOCSIFFLAGS: 784 /* if_ioctl() takes care of it */ 785 break; 786 787 default: 788 error = EINVAL; 789 break; 790 } 791 bad: 792 return error; 793 } 794 795 int 796 gif_set_tunnel(ifp, src, dst) 797 struct ifnet *ifp; 798 struct sockaddr *src; 799 struct sockaddr *dst; 800 { 801 struct gif_softc *sc = (struct gif_softc *)ifp; 802 struct gif_softc *sc2; 803 struct sockaddr *osrc, *odst, *sa; 804 int s; 805 int error; 806 807 s = splsoftnet(); 808 809 for (sc2 = LIST_FIRST(&gif_softc_list); sc2 != NULL; 810 sc2 = LIST_NEXT(sc2, gif_list)) { 811 if (sc2 == sc) 812 continue; 813 if (!sc2->gif_pdst || !sc2->gif_psrc) 814 continue; 815 if (sc2->gif_pdst->sa_family != dst->sa_family || 816 sc2->gif_pdst->sa_len != dst->sa_len || 817 sc2->gif_psrc->sa_family != src->sa_family || 818 sc2->gif_psrc->sa_len != src->sa_len) 819 continue; 820 /* can't configure same pair of address onto two gifs */ 821 if (bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 822 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 823 error = EADDRNOTAVAIL; 824 goto bad; 825 } 826 827 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 828 } 829 830 /* XXX we can detach from both, but be polite just in case */ 831 if (sc->gif_psrc) 832 switch (sc->gif_psrc->sa_family) { 833 #ifdef INET 834 case AF_INET: 835 (void)in_gif_detach(sc); 836 break; 837 #endif 838 #ifdef INET6 839 case AF_INET6: 840 (void)in6_gif_detach(sc); 841 break; 842 #endif 843 } 844 845 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 846 sc->gif_si = softintr_establish(IPL_SOFTNET, gifintr, sc); 847 if (sc->gif_si == NULL) { 848 error = ENOMEM; 849 goto bad; 850 } 851 #endif 852 853 osrc = sc->gif_psrc; 854 sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK); 855 bcopy((caddr_t)src, (caddr_t)sa, src->sa_len); 856 sc->gif_psrc = sa; 857 858 odst = sc->gif_pdst; 859 sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK); 860 bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len); 861 sc->gif_pdst = sa; 862 863 switch (sc->gif_psrc->sa_family) { 864 #ifdef INET 865 case AF_INET: 866 error = in_gif_attach(sc); 867 break; 868 #endif 869 #ifdef INET6 870 case AF_INET6: 871 error = in6_gif_attach(sc); 872 break; 873 #endif 874 default: 875 error = EINVAL; 876 break; 877 } 878 if (error) { 879 /* rollback */ 880 free((caddr_t)sc->gif_psrc, M_IFADDR); 881 free((caddr_t)sc->gif_pdst, M_IFADDR); 882 sc->gif_psrc = osrc; 883 sc->gif_pdst = odst; 884 goto bad; 885 } 886 887 if (osrc) 888 free((caddr_t)osrc, M_IFADDR); 889 if (odst) 890 free((caddr_t)odst, M_IFADDR); 891 892 if (sc->gif_psrc && sc->gif_pdst) 893 ifp->if_flags |= IFF_RUNNING; 894 else 895 ifp->if_flags &= ~IFF_RUNNING; 896 splx(s); 897 898 return 0; 899 900 bad: 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 && sc->gif_pdst) 908 ifp->if_flags |= IFF_RUNNING; 909 else 910 ifp->if_flags &= ~IFF_RUNNING; 911 splx(s); 912 913 return error; 914 } 915 916 void 917 gif_delete_tunnel(ifp) 918 struct ifnet *ifp; 919 { 920 struct gif_softc *sc = (struct gif_softc *)ifp; 921 int s; 922 923 s = splsoftnet(); 924 925 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 926 if (sc->gif_si) { 927 softintr_disestablish(sc->gif_si); 928 sc->gif_si = NULL; 929 } 930 #endif 931 if (sc->gif_psrc) { 932 free((caddr_t)sc->gif_psrc, M_IFADDR); 933 sc->gif_psrc = NULL; 934 } 935 if (sc->gif_pdst) { 936 free((caddr_t)sc->gif_pdst, M_IFADDR); 937 sc->gif_pdst = NULL; 938 } 939 /* it is safe to detach from both */ 940 #ifdef INET 941 (void)in_gif_detach(sc); 942 #endif 943 #ifdef INET6 944 (void)in6_gif_detach(sc); 945 #endif 946 947 if (sc->gif_psrc && sc->gif_pdst) 948 ifp->if_flags |= IFF_RUNNING; 949 else 950 ifp->if_flags &= ~IFF_RUNNING; 951 splx(s); 952 } 953 954 #ifdef ISO 955 struct eonhdr { 956 u_int8_t version; 957 u_int8_t class; 958 u_int16_t cksum; 959 }; 960 961 /* 962 * prepend EON header to ISO PDU 963 */ 964 static struct mbuf * 965 gif_eon_encap(struct mbuf *m) 966 { 967 struct eonhdr *ehdr; 968 969 M_PREPEND(m, sizeof(*ehdr), M_DONTWAIT); 970 if (m && m->m_len < sizeof(*ehdr)) 971 m = m_pullup(m, sizeof(*ehdr)); 972 if (m == NULL) 973 return NULL; 974 ehdr = mtod(m, struct eonhdr *); 975 ehdr->version = 1; 976 ehdr->class = 0; /* always unicast */ 977 #if 0 978 /* calculate the checksum of the eonhdr */ 979 { 980 struct mbuf mhead; 981 memset(&mhead, 0, sizeof(mhead)); 982 ehdr->cksum = 0; 983 mhead.m_data = (caddr_t)ehdr; 984 mhead.m_len = sizeof(*ehdr); 985 mhead.m_next = 0; 986 iso_gen_csum(&mhead, offsetof(struct eonhdr, cksum), 987 mhead.m_len); 988 } 989 #else 990 /* since the data is always constant we'll just plug the value in */ 991 ehdr->cksum = htons(0xfc02); 992 #endif 993 return m; 994 } 995 996 /* 997 * remove EON header and check checksum 998 */ 999 static struct mbuf * 1000 gif_eon_decap(struct ifnet *ifp, struct mbuf *m) 1001 { 1002 struct eonhdr *ehdr; 1003 1004 if (m->m_len < sizeof(*ehdr) && 1005 (m = m_pullup(m, sizeof(*ehdr))) == NULL) { 1006 ifp->if_ierrors++; 1007 return NULL; 1008 } 1009 if (iso_check_csum(m, sizeof(struct eonhdr))) { 1010 m_freem(m); 1011 return NULL; 1012 } 1013 m_adj(m, sizeof(*ehdr)); 1014 return m; 1015 } 1016 #endif /*ISO*/ 1017
Indexes created Thu Sep 25 16:09:42 GMT 2025