if_gif.c revision 1.36
1 /* $NetBSD: if_gif.c,v 1.36 2001/11/12 23:49:38 lukem 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 1.36 2001/11/12 23:49:38 lukem 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 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 53 #include <machine/intr.h> 54 #endif 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 #include <netinet/in_gif.h> 68 #endif /* INET */ 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 "gif.h" 90 #include "bpfilter.h" 91 92 #include <net/net_osdep.h> 93 94 #if NGIF > 0 95 96 void gifattach __P((int)); 97 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 98 void gifnetisr __P((void)); 99 #endif 100 void gifintr __P((void *)); 101 #ifdef ISO 102 static struct mbuf *gif_eon_encap __P((struct mbuf *)); 103 static struct mbuf *gif_eon_decap __P((struct ifnet *, struct mbuf *)); 104 #endif 105 106 /* 107 * gif global variable definitions 108 */ 109 LIST_HEAD(, gif_softc) gif_softc_list; 110 111 int gif_clone_create __P((struct if_clone *, int)); 112 void gif_clone_destroy __P((struct ifnet *)); 113 114 struct if_clone gif_cloner = 115 IF_CLONE_INITIALIZER("gif", gif_clone_create, gif_clone_destroy); 116 117 #ifndef MAX_GIF_NEST 118 /* 119 * This macro controls the upper limitation on nesting of gif tunnels. 120 * Since, setting a large value to this macro with a careless configuration 121 * may introduce system crash, we don't allow any nestings by default. 122 * If you need to configure nested gif tunnels, you can define this macro 123 * in your kernel configuration file. However, if you do so, please be 124 * careful to configure the tunnels so that it won't make a loop. 125 */ 126 #define MAX_GIF_NEST 1 127 #endif 128 static int max_gif_nesting = MAX_GIF_NEST; 129 130 /* ARGSUSED */ 131 void 132 gifattach(count) 133 int count; 134 { 135 136 LIST_INIT(&gif_softc_list); 137 if_clone_attach(&gif_cloner); 138 } 139 140 int 141 gif_clone_create(ifc, unit) 142 struct if_clone *ifc; 143 int unit; 144 { 145 struct gif_softc *sc; 146 147 sc = malloc(sizeof(struct gif_softc), M_DEVBUF, M_WAIT); 148 memset(sc, 0, sizeof(struct gif_softc)); 149 150 sprintf(sc->gif_if.if_xname, "%s%d", ifc->ifc_name, unit); 151 152 gifattach0(sc); 153 154 LIST_INSERT_HEAD(&gif_softc_list, sc, gif_list); 155 return (0); 156 } 157 158 void 159 gifattach0(sc) 160 struct gif_softc *sc; 161 { 162 163 sc->encap_cookie4 = sc->encap_cookie6 = NULL; 164 165 sc->gif_if.if_addrlen = 0; 166 sc->gif_if.if_mtu = GIF_MTU; 167 sc->gif_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 168 sc->gif_if.if_ioctl = gif_ioctl; 169 sc->gif_if.if_output = gif_output; 170 sc->gif_if.if_type = IFT_GIF; 171 sc->gif_if.if_dlt = DLT_NULL; 172 #ifdef ALTQ 173 IFQ_SET_READY(&sc->gif_if.if_snd); 174 #endif 175 if_attach(&sc->gif_if); 176 if_alloc_sadl(&sc->gif_if); 177 #if NBPFILTER > 0 178 bpfattach(&sc->gif_if, DLT_NULL, sizeof(u_int)); 179 #endif 180 } 181 182 void 183 gif_clone_destroy(ifp) 184 struct ifnet *ifp; 185 { 186 struct gif_softc *sc = (void *) ifp; 187 188 gif_delete_tunnel(&sc->gif_if); 189 LIST_REMOVE(sc, gif_list); 190 #ifdef INET6 191 encap_detach(sc->encap_cookie6); 192 #endif 193 #ifdef INET 194 encap_detach(sc->encap_cookie4); 195 #endif 196 197 #if NBPFILTER > 0 198 bpfdetach(ifp); 199 #endif 200 if_detach(ifp); 201 202 free(sc, M_DEVBUF); 203 } 204 205 int 206 gif_encapcheck(m, off, proto, arg) 207 const struct mbuf *m; 208 int off; 209 int proto; 210 void *arg; 211 { 212 struct ip ip; 213 struct gif_softc *sc; 214 215 sc = (struct gif_softc *)arg; 216 if (sc == NULL) 217 return 0; 218 219 if ((sc->gif_if.if_flags & IFF_UP) == 0) 220 return 0; 221 222 /* no physical address */ 223 if (!sc->gif_psrc || !sc->gif_pdst) 224 return 0; 225 226 switch (proto) { 227 #ifdef INET 228 case IPPROTO_IPV4: 229 break; 230 #endif 231 #ifdef INET6 232 case IPPROTO_IPV6: 233 break; 234 #endif 235 #ifdef ISO 236 case IPPROTO_EON: 237 break; 238 #endif 239 default: 240 return 0; 241 } 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 (sc->gif_psrc->sa_family != AF_INET6 || 257 sc->gif_pdst->sa_family != AF_INET6) 258 return 0; 259 return gif_encapcheck6(m, off, proto, arg); 260 #endif 261 default: 262 return 0; 263 } 264 } 265 266 int 267 gif_output(ifp, m, dst, rt) 268 struct ifnet *ifp; 269 struct mbuf *m; 270 struct sockaddr *dst; 271 struct rtentry *rt; /* added in net2 */ 272 { 273 struct gif_softc *sc = (struct gif_softc*)ifp; 274 int error = 0; 275 static int called = 0; /* XXX: MUTEX */ 276 #ifdef ALTQ 277 struct altq_pktattr pktattr; 278 #endif 279 int s; 280 281 #ifdef ALTQ 282 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 283 #endif 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 m->m_flags &= ~(M_BCAST|M_MCAST); 302 if (!(ifp->if_flags & IFF_UP) || 303 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 304 m_freem(m); 305 error = ENETDOWN; 306 goto end; 307 } 308 309 /* inner AF-specific encapsulation */ 310 switch (dst->sa_family) { 311 #ifdef ISO 312 case AF_ISO: 313 m = gif_eon_encap(m); 314 if (!m) { 315 error = ENOBUFS; 316 goto end; 317 } 318 break; 319 #endif 320 default: 321 break; 322 } 323 324 /* XXX should we check if our outer source is legal? */ 325 326 /* use DLT_NULL encapsulation here to pass inner af type */ 327 M_PREPEND(m, sizeof(int), M_DONTWAIT); 328 if (!m) { 329 error = ENOBUFS; 330 goto end; 331 } 332 *mtod(m, int *) = dst->sa_family; 333 334 s = splnet(); 335 #ifdef ALTQ 336 IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error); 337 if (error) { 338 splx(s); 339 goto end; 340 } 341 #else 342 if (IF_QFULL(&ifp->if_snd)) { 343 m_freem(m); 344 error = ENOBUFS; 345 splx(s); 346 goto end; 347 } 348 IF_ENQUEUE(&ifp->if_snd, m); 349 #endif /* ALTQ */ 350 splx(s); 351 352 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 353 softintr_schedule(sc->gif_si); 354 #else 355 /* XXX bad spl level? */ 356 gifnetisr(); 357 #endif 358 error = 0; 359 360 end: 361 called = 0; /* reset recursion counter */ 362 if (error) 363 ifp->if_oerrors++; 364 return error; 365 } 366 367 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 368 void 369 gifnetisr() 370 { 371 struct gif_softc *sc; 372 373 for (sc = LIST_FIRST(&gif_softc_list); sc != NULL; 374 sc = LIST_NEXT(sc, gif_list)) { 375 gifintr(sc); 376 } 377 } 378 #endif 379 380 void 381 gifintr(arg) 382 void *arg; 383 { 384 struct gif_softc *sc; 385 struct ifnet *ifp; 386 struct mbuf *m; 387 int family; 388 int len; 389 int s; 390 int error; 391 392 sc = (struct gif_softc *)arg; 393 ifp = &sc->gif_if; 394 395 /* output processing */ 396 while (1) { 397 s = splnet(); 398 #ifdef ALTQ 399 IFQ_DEQUEUE(&sc->gif_if.if_snd, m); 400 #else 401 IF_DEQUEUE(&sc->gif_if.if_snd, m); 402 #endif 403 splx(s); 404 if (m == NULL) 405 break; 406 407 /* grab and chop off inner af type */ 408 if (sizeof(int) > m->m_len) { 409 m = m_pullup(m, sizeof(int)); 410 if (!m) { 411 ifp->if_oerrors++; 412 continue; 413 } 414 } 415 family = *mtod(m, int *); 416 #if NBPFILTER > 0 417 if (ifp->if_bpf) { 418 #ifdef HAVE_OLD_BPF 419 bpf_mtap(ifp, m); 420 #else 421 bpf_mtap(ifp->if_bpf, m); 422 #endif 423 } 424 #endif 425 m_adj(m, sizeof(int)); 426 427 len = m->m_pkthdr.len; 428 429 /* dispatch to output logic based on outer AF */ 430 switch (sc->gif_psrc->sa_family) { 431 #ifdef INET 432 case AF_INET: 433 error = in_gif_output(ifp, family, m); 434 break; 435 #endif 436 #ifdef INET6 437 case AF_INET6: 438 error = in6_gif_output(ifp, family, m); 439 break; 440 #endif 441 default: 442 m_freem(m); 443 error = ENETDOWN; 444 break; 445 } 446 447 if (error) 448 ifp->if_oerrors++; 449 else { 450 ifp->if_opackets++; 451 ifp->if_obytes += len; 452 } 453 } 454 } 455 456 void 457 gif_input(m, af, ifp) 458 struct mbuf *m; 459 int af; 460 struct ifnet *ifp; 461 { 462 int s, isr; 463 struct ifqueue *ifq = NULL; 464 465 if (ifp == NULL) { 466 /* just in case */ 467 m_freem(m); 468 return; 469 } 470 471 m->m_pkthdr.rcvif = ifp; 472 473 #if NBPFILTER > 0 474 if (ifp->if_bpf) { 475 /* 476 * We need to prepend the address family as 477 * a four byte field. Cons up a dummy header 478 * to pacify bpf. This is safe because bpf 479 * will only read from the mbuf (i.e., it won't 480 * try to free it or keep a pointer a to it). 481 */ 482 struct mbuf m0; 483 u_int32_t af1 = af; 484 485 m0.m_next = m; 486 m0.m_len = 4; 487 m0.m_data = (char *)&af1; 488 489 #ifdef HAVE_OLD_BPF 490 bpf_mtap(ifp, &m0); 491 #else 492 bpf_mtap(ifp->if_bpf, &m0); 493 #endif 494 } 495 #endif /*NBPFILTER > 0*/ 496 497 /* 498 * Put the packet to the network layer input queue according to the 499 * specified address family. 500 * Note: older versions of gif_input directly called network layer 501 * input functions, e.g. ip6_input, here. We changed the policy to 502 * prevent too many recursive calls of such input functions, which 503 * might cause kernel panic. But the change may introduce another 504 * problem; if the input queue is full, packets are discarded. 505 * The kernel stack overflow really happened, and we believed 506 * queue-full rarely occurs, so we changed the policy. 507 */ 508 switch (af) { 509 #ifdef INET 510 case AF_INET: 511 ifq = &ipintrq; 512 isr = NETISR_IP; 513 break; 514 #endif 515 #ifdef INET6 516 case AF_INET6: 517 ifq = &ip6intrq; 518 isr = NETISR_IPV6; 519 break; 520 #endif 521 #ifdef ISO 522 case AF_ISO: 523 m = gif_eon_decap(ifp, m); 524 if (!m) 525 return; 526 ifq = &clnlintrq; 527 isr = NETISR_ISO; 528 break; 529 #endif 530 default: 531 m_freem(m); 532 return; 533 } 534 535 s = splnet(); 536 if (IF_QFULL(ifq)) { 537 IF_DROP(ifq); /* update statistics */ 538 m_freem(m); 539 splx(s); 540 return; 541 } 542 ifp->if_ipackets++; 543 ifp->if_ibytes += m->m_pkthdr.len; 544 IF_ENQUEUE(ifq, m); 545 /* we need schednetisr since the address family may change */ 546 schednetisr(isr); 547 splx(s); 548 } 549 550 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 551 int 552 gif_ioctl(ifp, cmd, data) 553 struct ifnet *ifp; 554 u_long cmd; 555 caddr_t data; 556 { 557 struct proc *p = curproc; /* XXX */ 558 struct gif_softc *sc = (struct gif_softc*)ifp; 559 struct ifreq *ifr = (struct ifreq*)data; 560 int error = 0, size; 561 struct sockaddr *dst, *src; 562 563 switch (cmd) { 564 case SIOCSIFADDR: 565 ifp->if_flags |= IFF_UP; 566 break; 567 568 case SIOCSIFDSTADDR: 569 break; 570 571 case SIOCADDMULTI: 572 case SIOCDELMULTI: 573 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 574 break; 575 switch (ifr->ifr_addr.sa_family) { 576 #ifdef INET 577 case AF_INET: /* IP supports Multicast */ 578 break; 579 #endif /* INET */ 580 #ifdef INET6 581 case AF_INET6: /* IP6 supports Multicast */ 582 break; 583 #endif /* INET6 */ 584 default: /* Other protocols doesn't support Multicast */ 585 error = EAFNOSUPPORT; 586 break; 587 } 588 break; 589 590 #ifdef SIOCSIFMTU /* xxx */ 591 case SIOCGIFMTU: 592 break; 593 594 case SIOCSIFMTU: 595 { 596 u_long mtu; 597 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 598 break; 599 mtu = ifr->ifr_mtu; 600 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) { 601 return (EINVAL); 602 } 603 ifp->if_mtu = mtu; 604 } 605 break; 606 #endif /* SIOCSIFMTU */ 607 608 #ifdef INET 609 case SIOCSIFPHYADDR: 610 #endif 611 #ifdef INET6 612 case SIOCSIFPHYADDR_IN6: 613 #endif /* INET6 */ 614 case SIOCSLIFPHYADDR: 615 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 616 break; 617 switch (cmd) { 618 #ifdef INET 619 case SIOCSIFPHYADDR: 620 src = (struct sockaddr *) 621 &(((struct in_aliasreq *)data)->ifra_addr); 622 dst = (struct sockaddr *) 623 &(((struct in_aliasreq *)data)->ifra_dstaddr); 624 break; 625 #endif 626 #ifdef INET6 627 case SIOCSIFPHYADDR_IN6: 628 src = (struct sockaddr *) 629 &(((struct in6_aliasreq *)data)->ifra_addr); 630 dst = (struct sockaddr *) 631 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 632 break; 633 #endif 634 case SIOCSLIFPHYADDR: 635 src = (struct sockaddr *) 636 &(((struct if_laddrreq *)data)->addr); 637 dst = (struct sockaddr *) 638 &(((struct if_laddrreq *)data)->dstaddr); 639 break; 640 default: 641 return EINVAL; 642 } 643 644 /* sa_family must be equal */ 645 if (src->sa_family != dst->sa_family) 646 return EINVAL; 647 648 /* validate sa_len */ 649 switch (src->sa_family) { 650 #ifdef INET 651 case AF_INET: 652 if (src->sa_len != sizeof(struct sockaddr_in)) 653 return EINVAL; 654 break; 655 #endif 656 #ifdef INET6 657 case AF_INET6: 658 if (src->sa_len != sizeof(struct sockaddr_in6)) 659 return EINVAL; 660 break; 661 #endif 662 default: 663 return EAFNOSUPPORT; 664 } 665 switch (dst->sa_family) { 666 #ifdef INET 667 case AF_INET: 668 if (dst->sa_len != sizeof(struct sockaddr_in)) 669 return EINVAL; 670 break; 671 #endif 672 #ifdef INET6 673 case AF_INET6: 674 if (dst->sa_len != sizeof(struct sockaddr_in6)) 675 return EINVAL; 676 break; 677 #endif 678 default: 679 return EAFNOSUPPORT; 680 } 681 682 /* check sa_family looks sane for the cmd */ 683 switch (cmd) { 684 case SIOCSIFPHYADDR: 685 if (src->sa_family == AF_INET) 686 break; 687 return EAFNOSUPPORT; 688 #ifdef INET6 689 case SIOCSIFPHYADDR_IN6: 690 if (src->sa_family == AF_INET6) 691 break; 692 return EAFNOSUPPORT; 693 #endif /* INET6 */ 694 case SIOCSLIFPHYADDR: 695 /* checks done in the above */ 696 break; 697 } 698 699 error = gif_set_tunnel(&sc->gif_if, src, dst); 700 break; 701 702 #ifdef SIOCDIFPHYADDR 703 case SIOCDIFPHYADDR: 704 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 705 break; 706 gif_delete_tunnel(&sc->gif_if); 707 break; 708 #endif 709 710 case SIOCGIFPSRCADDR: 711 #ifdef INET6 712 case SIOCGIFPSRCADDR_IN6: 713 #endif /* INET6 */ 714 if (sc->gif_psrc == NULL) { 715 error = EADDRNOTAVAIL; 716 goto bad; 717 } 718 src = sc->gif_psrc; 719 switch (cmd) { 720 #ifdef INET 721 case SIOCGIFPSRCADDR: 722 dst = &ifr->ifr_addr; 723 size = sizeof(ifr->ifr_addr); 724 break; 725 #endif /* INET */ 726 #ifdef INET6 727 case SIOCGIFPSRCADDR_IN6: 728 dst = (struct sockaddr *) 729 &(((struct in6_ifreq *)data)->ifr_addr); 730 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 731 break; 732 #endif /* INET6 */ 733 default: 734 error = EADDRNOTAVAIL; 735 goto bad; 736 } 737 if (src->sa_len > size) 738 return EINVAL; 739 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 740 break; 741 742 case SIOCGIFPDSTADDR: 743 #ifdef INET6 744 case SIOCGIFPDSTADDR_IN6: 745 #endif /* INET6 */ 746 if (sc->gif_pdst == NULL) { 747 error = EADDRNOTAVAIL; 748 goto bad; 749 } 750 src = sc->gif_pdst; 751 switch (cmd) { 752 #ifdef INET 753 case SIOCGIFPDSTADDR: 754 dst = &ifr->ifr_addr; 755 size = sizeof(ifr->ifr_addr); 756 break; 757 #endif /* INET */ 758 #ifdef INET6 759 case SIOCGIFPDSTADDR_IN6: 760 dst = (struct sockaddr *) 761 &(((struct in6_ifreq *)data)->ifr_addr); 762 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 763 break; 764 #endif /* INET6 */ 765 default: 766 error = EADDRNOTAVAIL; 767 goto bad; 768 } 769 if (src->sa_len > size) 770 return EINVAL; 771 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 772 break; 773 774 case SIOCGLIFPHYADDR: 775 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 776 error = EADDRNOTAVAIL; 777 goto bad; 778 } 779 780 /* copy src */ 781 src = sc->gif_psrc; 782 dst = (struct sockaddr *) 783 &(((struct if_laddrreq *)data)->addr); 784 size = sizeof(((struct if_laddrreq *)data)->addr); 785 if (src->sa_len > size) 786 return EINVAL; 787 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 788 789 /* copy dst */ 790 src = sc->gif_pdst; 791 dst = (struct sockaddr *) 792 &(((struct if_laddrreq *)data)->dstaddr); 793 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 794 if (src->sa_len > size) 795 return EINVAL; 796 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 797 break; 798 799 case SIOCSIFFLAGS: 800 /* if_ioctl() takes care of it */ 801 break; 802 803 default: 804 error = EINVAL; 805 break; 806 } 807 bad: 808 return error; 809 } 810 811 int 812 gif_set_tunnel(ifp, src, dst) 813 struct ifnet *ifp; 814 struct sockaddr *src; 815 struct sockaddr *dst; 816 { 817 struct gif_softc *sc = (struct gif_softc *)ifp; 818 struct gif_softc *sc2; 819 struct sockaddr *osrc, *odst, *sa; 820 int s; 821 int error; 822 823 s = splsoftnet(); 824 825 for (sc2 = LIST_FIRST(&gif_softc_list); sc2 != NULL; 826 sc2 = LIST_NEXT(sc2, gif_list)) { 827 if (sc2 == sc) 828 continue; 829 if (!sc2->gif_pdst || !sc2->gif_psrc) 830 continue; 831 if (sc2->gif_pdst->sa_family != dst->sa_family || 832 sc2->gif_pdst->sa_len != dst->sa_len || 833 sc2->gif_psrc->sa_family != src->sa_family || 834 sc2->gif_psrc->sa_len != src->sa_len) 835 continue; 836 /* can't configure same pair of address onto two gifs */ 837 if (bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 838 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 839 error = EADDRNOTAVAIL; 840 goto bad; 841 } 842 843 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 844 } 845 846 /* XXX we can detach from both, but be polite just in case */ 847 if (sc->gif_psrc) 848 switch (sc->gif_psrc->sa_family) { 849 #ifdef INET 850 case AF_INET: 851 (void)in_gif_detach(sc); 852 break; 853 #endif 854 #ifdef INET6 855 case AF_INET6: 856 (void)in6_gif_detach(sc); 857 break; 858 #endif 859 } 860 861 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 862 sc->gif_si = softintr_establish(IPL_SOFTNET, gifintr, sc); 863 if (sc->gif_si == NULL) { 864 error = ENOMEM; 865 goto bad; 866 } 867 #endif 868 869 osrc = sc->gif_psrc; 870 sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK); 871 bcopy((caddr_t)src, (caddr_t)sa, src->sa_len); 872 sc->gif_psrc = sa; 873 874 odst = sc->gif_pdst; 875 sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK); 876 bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len); 877 sc->gif_pdst = sa; 878 879 switch (sc->gif_psrc->sa_family) { 880 #ifdef INET 881 case AF_INET: 882 error = in_gif_attach(sc); 883 break; 884 #endif 885 #ifdef INET6 886 case AF_INET6: 887 error = in6_gif_attach(sc); 888 break; 889 #endif 890 } 891 if (error) { 892 /* rollback */ 893 free((caddr_t)sc->gif_psrc, M_IFADDR); 894 free((caddr_t)sc->gif_pdst, M_IFADDR); 895 sc->gif_psrc = osrc; 896 sc->gif_pdst = odst; 897 goto bad; 898 } 899 900 if (osrc) 901 free((caddr_t)osrc, M_IFADDR); 902 if (odst) 903 free((caddr_t)odst, M_IFADDR); 904 905 if (sc->gif_psrc && sc->gif_pdst) 906 ifp->if_flags |= IFF_RUNNING; 907 else 908 ifp->if_flags &= ~IFF_RUNNING; 909 splx(s); 910 911 return 0; 912 913 bad: 914 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 915 if (sc->gif_si) { 916 softintr_disestablish(sc->gif_si); 917 sc->gif_si = NULL; 918 } 919 #endif 920 if (sc->gif_psrc && sc->gif_pdst) 921 ifp->if_flags |= IFF_RUNNING; 922 else 923 ifp->if_flags &= ~IFF_RUNNING; 924 splx(s); 925 926 return error; 927 } 928 929 void 930 gif_delete_tunnel(ifp) 931 struct ifnet *ifp; 932 { 933 struct gif_softc *sc = (struct gif_softc *)ifp; 934 int s; 935 936 s = splsoftnet(); 937 938 #ifdef __HAVE_GENERIC_SOFT_INTERRUPTS 939 if (sc->gif_si) { 940 softintr_disestablish(sc->gif_si); 941 sc->gif_si = NULL; 942 } 943 #endif 944 if (sc->gif_psrc) { 945 free((caddr_t)sc->gif_psrc, M_IFADDR); 946 sc->gif_psrc = NULL; 947 } 948 if (sc->gif_pdst) { 949 free((caddr_t)sc->gif_pdst, M_IFADDR); 950 sc->gif_pdst = NULL; 951 } 952 /* it is safe to detach from both */ 953 #ifdef INET 954 (void)in_gif_detach(sc); 955 #endif 956 #ifdef INET6 957 (void)in6_gif_detach(sc); 958 #endif 959 960 if (sc->gif_psrc && sc->gif_pdst) 961 ifp->if_flags |= IFF_RUNNING; 962 else 963 ifp->if_flags &= ~IFF_RUNNING; 964 splx(s); 965 } 966 967 #ifdef ISO 968 struct eonhdr { 969 u_int8_t version; 970 u_int8_t class; 971 u_int16_t cksum; 972 }; 973 974 /* 975 * prepend EON header to ISO PDU 976 */ 977 static struct mbuf * 978 gif_eon_encap(struct mbuf *m) 979 { 980 struct eonhdr *ehdr; 981 982 M_PREPEND(m, sizeof(*ehdr), M_DONTWAIT); 983 if (m && m->m_len < sizeof(*ehdr)) 984 m = m_pullup(m, sizeof(*ehdr)); 985 if (m == NULL) 986 return NULL; 987 ehdr = mtod(m, struct eonhdr *); 988 ehdr->version = 1; 989 ehdr->class = 0; /* always unicast */ 990 #if 0 991 /* calculate the checksum of the eonhdr */ 992 { 993 struct mbuf mhead; 994 memset(&mhead, 0, sizeof(mhead)); 995 ehdr->cksum = 0; 996 mhead.m_data = (caddr_t)ehdr; 997 mhead.m_len = sizeof(*ehdr); 998 mhead.m_next = 0; 999 iso_gen_csum(&mhead, offsetof(struct eonhdr, cksum), 1000 mhead.m_len); 1001 } 1002 #else 1003 /* since the data is always constant we'll just plug the value in */ 1004 ehdr->cksum = htons(0xfc02); 1005 #endif 1006 return m; 1007 } 1008 1009 /* 1010 * remove EON header and check checksum 1011 */ 1012 static struct mbuf * 1013 gif_eon_decap(struct ifnet *ifp, struct mbuf *m) 1014 { 1015 struct eonhdr *ehdr; 1016 1017 if (m->m_len < sizeof(*ehdr) && 1018 (m = m_pullup(m, sizeof(*ehdr))) == NULL) { 1019 ifp->if_ierrors++; 1020 return NULL; 1021 } 1022 if (iso_check_csum(m, sizeof(struct eonhdr))) { 1023 m_freem(m); 1024 return NULL; 1025 } 1026 m_adj(m, sizeof(*ehdr)); 1027 return m; 1028 } 1029 #endif /*ISO*/ 1030 #endif /*NGIF > 0*/ 1031
Indexes created Sat Sep 27 22:09:54 GMT 2025