if_gif.c revision 1.30
1 /* $NetBSD: if_gif.c,v 1.30 2001/07/18 16:43:09 thorpej Exp $ */ 2 /* $KAME: if_gif.c,v 1.49 2001/06/04 12:03:41 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include "opt_inet.h" 34 #include "opt_iso.h" 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/kernel.h> 39 #include <sys/mbuf.h> 40 #include <sys/socket.h> 41 #include <sys/sockio.h> 42 #include <sys/errno.h> 43 #include <sys/ioctl.h> 44 #include <sys/time.h> 45 #include <sys/syslog.h> 46 #include <sys/proc.h> 47 #include <sys/protosw.h> 48 #include <machine/cpu.h> 49 50 #include <net/if.h> 51 #include <net/if_types.h> 52 #include <net/netisr.h> 53 #include <net/route.h> 54 #include <net/bpf.h> 55 56 #include <netinet/in.h> 57 #include <netinet/in_systm.h> 58 #include <netinet/ip.h> 59 #ifdef INET 60 #include <netinet/in_var.h> 61 #include <netinet/in_gif.h> 62 #endif /* INET */ 63 64 #ifdef INET6 65 #ifndef INET 66 #include <netinet/in.h> 67 #endif 68 #include <netinet6/in6_var.h> 69 #include <netinet/ip6.h> 70 #include <netinet6/ip6_var.h> 71 #include <netinet6/in6_gif.h> 72 #include <netinet6/ip6protosw.h> 73 #endif /* INET6 */ 74 75 #ifdef ISO 76 #include <netiso/iso.h> 77 #include <netiso/iso_var.h> 78 #endif 79 80 #include <netinet/ip_encap.h> 81 #include <net/if_gif.h> 82 83 #include "gif.h" 84 #include "bpfilter.h" 85 86 #include <net/net_osdep.h> 87 88 #if NGIF > 0 89 90 void gifattach __P((int)); 91 static int gif_encapcheck __P((const struct mbuf *, int, int, void *)); 92 #ifdef INET 93 extern struct protosw in_gif_protosw; 94 #endif 95 #ifdef INET6 96 extern struct ip6protosw in6_gif_protosw; 97 #endif 98 #ifdef ISO 99 static int gif_eon_encap(struct mbuf **); 100 static int gif_eon_decap(struct ifnet *, struct mbuf **); 101 #endif 102 103 /* 104 * gif global variable definitions 105 */ 106 LIST_HEAD(, gif_softc) gif_softc_list; 107 108 int gif_clone_create __P((struct if_clone *, int)); 109 void gif_clone_destroy __P((struct ifnet *)); 110 111 struct if_clone gif_cloner = 112 IF_CLONE_INITIALIZER("gif", gif_clone_create, gif_clone_destroy); 113 114 void gif_delete_tunnel __P((struct gif_softc *)); 115 116 #ifndef MAX_GIF_NEST 117 /* 118 * This macro controls the upper limitation on nesting of gif tunnels. 119 * Since, setting a large value to this macro with a careless configuration 120 * may introduce system crash, we don't allow any nestings by default. 121 * If you need to configure nested gif tunnels, you can define this macro 122 * in your kernel configuration file. However, if you do so, please be 123 * careful to configure the tunnels so that it won't make a loop. 124 */ 125 #define MAX_GIF_NEST 1 126 #endif 127 static int max_gif_nesting = MAX_GIF_NEST; 128 129 /* ARGSUSED */ 130 void 131 gifattach(count) 132 int count; 133 { 134 135 LIST_INIT(&gif_softc_list); 136 if_clone_attach(&gif_cloner); 137 } 138 139 int 140 gif_clone_create(ifc, unit) 141 struct if_clone *ifc; 142 int unit; 143 { 144 struct gif_softc *sc; 145 146 sc = malloc(sizeof(struct gif_softc), M_DEVBUF, M_WAIT); 147 memset(sc, 0, sizeof(struct gif_softc)); 148 149 sprintf(sc->gif_if.if_xname, "%s%d", ifc->ifc_name, unit); 150 151 sc->encap_cookie4 = sc->encap_cookie6 = NULL; 152 #ifdef INET 153 sc->encap_cookie4 = encap_attach_func(AF_INET, -1, 154 gif_encapcheck, &in_gif_protosw, sc); 155 if (sc->encap_cookie4 == NULL) { 156 printf("%s: unable to attach encap4\n", if_name(&sc->gif_if)); 157 free(sc, M_DEVBUF); 158 return (EIO); /* XXX */ 159 } 160 #endif 161 #ifdef INET6 162 sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, 163 gif_encapcheck, (struct protosw *)&in6_gif_protosw, sc); 164 if (sc->encap_cookie6 == NULL) { 165 if (sc->encap_cookie4) { 166 encap_detach(sc->encap_cookie4); 167 sc->encap_cookie4 = NULL; 168 } 169 printf("%s: unable to attach encap6\n", if_name(&sc->gif_if)); 170 free(sc, M_DEVBUF); 171 return (EIO); /* XXX */ 172 } 173 #endif 174 175 sc->gif_if.if_mtu = GIF_MTU; 176 sc->gif_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 177 sc->gif_if.if_ioctl = gif_ioctl; 178 sc->gif_if.if_output = gif_output; 179 sc->gif_if.if_type = IFT_GIF; 180 sc->gif_if.if_dlt = DLT_NULL; 181 if_attach(&sc->gif_if); 182 if_alloc_sadl(&sc->gif_if); 183 #if NBPFILTER > 0 184 bpfattach(&sc->gif_if, DLT_NULL, sizeof(u_int)); 185 #endif 186 LIST_INSERT_HEAD(&gif_softc_list, sc, gif_list); 187 return (0); 188 } 189 190 void 191 gif_clone_destroy(ifp) 192 struct ifnet *ifp; 193 { 194 struct gif_softc *sc = (void *) ifp; 195 196 gif_delete_tunnel(sc); 197 LIST_REMOVE(sc, gif_list); 198 #ifdef INET6 199 encap_detach(sc->encap_cookie6); 200 #endif 201 #ifdef INET 202 encap_detach(sc->encap_cookie4); 203 #endif 204 205 #if NBPFILTER > 0 206 bpfdetach(ifp); 207 #endif 208 if_detach(ifp); 209 210 free(sc, M_DEVBUF); 211 } 212 213 static int 214 gif_encapcheck(m, off, proto, arg) 215 const struct mbuf *m; 216 int off; 217 int proto; 218 void *arg; 219 { 220 struct ip ip; 221 struct gif_softc *sc; 222 223 sc = (struct gif_softc *)arg; 224 if (sc == NULL) 225 return 0; 226 227 if ((sc->gif_if.if_flags & IFF_UP) == 0) 228 return 0; 229 230 /* no physical address */ 231 if (!sc->gif_psrc || !sc->gif_pdst) 232 return 0; 233 234 switch (proto) { 235 #ifdef INET 236 case IPPROTO_IPV4: 237 break; 238 #endif 239 #ifdef INET6 240 case IPPROTO_IPV6: 241 break; 242 #endif 243 #ifdef ISO 244 case IPPROTO_EON: 245 break; 246 #endif 247 default: 248 return 0; 249 } 250 251 /* LINTED const cast */ 252 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); 253 254 switch (ip.ip_v) { 255 #ifdef INET 256 case 4: 257 if (sc->gif_psrc->sa_family != AF_INET || 258 sc->gif_pdst->sa_family != AF_INET) 259 return 0; 260 return gif_encapcheck4(m, off, proto, arg); 261 #endif 262 #ifdef INET6 263 case 6: 264 if (sc->gif_psrc->sa_family != AF_INET6 || 265 sc->gif_pdst->sa_family != AF_INET6) 266 return 0; 267 return gif_encapcheck6(m, off, proto, arg); 268 #endif 269 default: 270 return 0; 271 } 272 } 273 274 int 275 gif_output(ifp, m, dst, rt) 276 struct ifnet *ifp; 277 struct mbuf *m; 278 struct sockaddr *dst; 279 struct rtentry *rt; /* added in net2 */ 280 { 281 struct gif_softc *sc = (struct gif_softc*)ifp; 282 int error = 0; 283 static int called = 0; /* XXX: MUTEX */ 284 285 /* 286 * gif may cause infinite recursion calls when misconfigured. 287 * We'll prevent this by introducing upper limit. 288 * XXX: this mechanism may introduce another problem about 289 * mutual exclusion of the variable CALLED, especially if we 290 * use kernel thread. 291 */ 292 if (++called > max_gif_nesting) { 293 log(LOG_NOTICE, 294 "gif_output: recursively called too many times(%d)\n", 295 called); 296 m_freem(m); 297 error = EIO; /* is there better errno? */ 298 goto end; 299 } 300 301 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 #if NBPFILTER > 0 310 if (ifp->if_bpf) { 311 /* 312 * We need to prepend the address family as 313 * a four byte field. Cons up a dummy header 314 * to pacify bpf. This is safe because bpf 315 * will only read from the mbuf (i.e., it won't 316 * try to free it or keep a pointer a to it). 317 */ 318 struct mbuf m0; 319 u_int32_t af = dst->sa_family; 320 321 m0.m_next = m; 322 m0.m_len = 4; 323 m0.m_data = (char *)⁡ 324 325 #ifdef HAVE_OLD_BPF 326 bpf_mtap(ifp, &m0); 327 #else 328 bpf_mtap(ifp->if_bpf, &m0); 329 #endif 330 } 331 #endif 332 ifp->if_opackets++; 333 ifp->if_obytes += m->m_pkthdr.len; 334 335 /* inner AF-specific encapsulation */ 336 switch (dst->sa_family) { 337 #ifdef ISO 338 case AF_ISO: 339 error = gif_eon_encap(&m); 340 if (error) 341 goto end; 342 #endif 343 default: 344 break; 345 } 346 347 /* XXX should we check if our outer source is legal? */ 348 349 /* dispatch to output logic based on outer AF */ 350 switch (sc->gif_psrc->sa_family) { 351 #ifdef INET 352 case AF_INET: 353 error = in_gif_output(ifp, dst->sa_family, m, rt); 354 break; 355 #endif 356 #ifdef INET6 357 case AF_INET6: 358 error = in6_gif_output(ifp, dst->sa_family, m, rt); 359 break; 360 #endif 361 default: 362 m_freem(m); 363 error = ENETDOWN; 364 } 365 366 end: 367 called = 0; /* reset recursion counter */ 368 if (error) ifp->if_oerrors++; 369 return error; 370 } 371 372 void 373 gif_input(m, af, gifp) 374 struct mbuf *m; 375 int af; 376 struct ifnet *gifp; 377 { 378 int s, isr; 379 struct ifqueue *ifq = 0; 380 381 if (gifp == NULL) { 382 /* just in case */ 383 m_freem(m); 384 return; 385 } 386 387 m->m_pkthdr.rcvif = gifp; 388 389 #if NBPFILTER > 0 390 if (gifp->if_bpf) { 391 /* 392 * We need to prepend the address family as 393 * a four byte field. Cons up a dummy header 394 * to pacify bpf. This is safe because bpf 395 * will only read from the mbuf (i.e., it won't 396 * try to free it or keep a pointer a to it). 397 */ 398 struct mbuf m0; 399 u_int32_t af1 = af; 400 401 m0.m_next = m; 402 m0.m_len = 4; 403 m0.m_data = (char *)&af1; 404 405 #ifdef HAVE_OLD_BPF 406 bpf_mtap(gifp, &m0); 407 #else 408 bpf_mtap(gifp->if_bpf, &m0); 409 #endif 410 } 411 #endif /*NBPFILTER > 0*/ 412 413 /* 414 * Put the packet to the network layer input queue according to the 415 * specified address family. 416 * Note: older versions of gif_input directly called network layer 417 * input functions, e.g. ip6_input, here. We changed the policy to 418 * prevent too many recursive calls of such input functions, which 419 * might cause kernel panic. But the change may introduce another 420 * problem; if the input queue is full, packets are discarded. 421 * We believed it rarely occurs and changed the policy. If we find 422 * it occurs more times than we thought, we may change the policy 423 * again. 424 */ 425 switch (af) { 426 #ifdef INET 427 case AF_INET: 428 ifq = &ipintrq; 429 isr = NETISR_IP; 430 break; 431 #endif 432 #ifdef INET6 433 case AF_INET6: 434 ifq = &ip6intrq; 435 isr = NETISR_IPV6; 436 break; 437 #endif 438 #ifdef ISO 439 case AF_ISO: 440 if (gif_eon_decap(gifp, &m)) { 441 if (m) 442 m_freem(m); 443 return; 444 } 445 ifq = &clnlintrq; 446 isr = NETISR_ISO; 447 break; 448 #endif 449 default: 450 m_freem(m); 451 return; 452 } 453 454 s = splnet(); 455 if (IF_QFULL(ifq)) { 456 IF_DROP(ifq); /* update statistics */ 457 m_freem(m); 458 splx(s); 459 return; 460 } 461 IF_ENQUEUE(ifq, m); 462 /* we need schednetisr since the address family may change */ 463 schednetisr(isr); 464 gifp->if_ipackets++; 465 gifp->if_ibytes += m->m_pkthdr.len; 466 splx(s); 467 468 return; 469 } 470 471 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 472 int 473 gif_ioctl(ifp, cmd, data) 474 struct ifnet *ifp; 475 u_long cmd; 476 caddr_t data; 477 { 478 struct proc *p = curproc; /* XXX */ 479 struct gif_softc *sc = (struct gif_softc*)ifp; 480 struct ifreq *ifr = (struct ifreq*)data; 481 int error = 0, size; 482 struct sockaddr *dst, *src; 483 struct sockaddr *sa; 484 int s; 485 struct gif_softc *sc2; 486 487 switch (cmd) { 488 case SIOCSIFADDR: 489 break; 490 491 case SIOCSIFDSTADDR: 492 break; 493 494 case SIOCADDMULTI: 495 case SIOCDELMULTI: 496 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 497 break; 498 switch (ifr->ifr_addr.sa_family) { 499 #ifdef INET 500 case AF_INET: /* IP supports Multicast */ 501 break; 502 #endif /* INET */ 503 #ifdef INET6 504 case AF_INET6: /* IP6 supports Multicast */ 505 break; 506 #endif /* INET6 */ 507 default: /* Other protocols doesn't support Multicast */ 508 error = EAFNOSUPPORT; 509 break; 510 } 511 break; 512 513 #ifdef SIOCSIFMTU /* xxx */ 514 case SIOCGIFMTU: 515 break; 516 517 case SIOCSIFMTU: 518 { 519 u_long mtu; 520 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 521 break; 522 mtu = ifr->ifr_mtu; 523 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) { 524 return (EINVAL); 525 } 526 ifp->if_mtu = mtu; 527 } 528 break; 529 #endif /* SIOCSIFMTU */ 530 531 case SIOCSIFPHYADDR: 532 #ifdef INET6 533 case SIOCSIFPHYADDR_IN6: 534 #endif /* INET6 */ 535 case SIOCSLIFPHYADDR: 536 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 537 break; 538 switch (cmd) { 539 #ifdef INET 540 case SIOCSIFPHYADDR: 541 src = (struct sockaddr *) 542 &(((struct in_aliasreq *)data)->ifra_addr); 543 dst = (struct sockaddr *) 544 &(((struct in_aliasreq *)data)->ifra_dstaddr); 545 break; 546 #endif 547 #ifdef INET6 548 case SIOCSIFPHYADDR_IN6: 549 src = (struct sockaddr *) 550 &(((struct in6_aliasreq *)data)->ifra_addr); 551 dst = (struct sockaddr *) 552 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 553 break; 554 #endif 555 case SIOCSLIFPHYADDR: 556 src = (struct sockaddr *) 557 &(((struct if_laddrreq *)data)->addr); 558 dst = (struct sockaddr *) 559 &(((struct if_laddrreq *)data)->dstaddr); 560 } 561 562 /* sa_family must be equal */ 563 if (src->sa_family != dst->sa_family) 564 return EINVAL; 565 566 /* validate sa_len */ 567 switch (src->sa_family) { 568 #ifdef INET 569 case AF_INET: 570 if (src->sa_len != sizeof(struct sockaddr_in)) 571 return EINVAL; 572 break; 573 #endif 574 #ifdef INET6 575 case AF_INET6: 576 if (src->sa_len != sizeof(struct sockaddr_in6)) 577 return EINVAL; 578 break; 579 #endif 580 default: 581 return EAFNOSUPPORT; 582 } 583 switch (dst->sa_family) { 584 #ifdef INET 585 case AF_INET: 586 if (dst->sa_len != sizeof(struct sockaddr_in)) 587 return EINVAL; 588 break; 589 #endif 590 #ifdef INET6 591 case AF_INET6: 592 if (dst->sa_len != sizeof(struct sockaddr_in6)) 593 return EINVAL; 594 break; 595 #endif 596 default: 597 return EAFNOSUPPORT; 598 } 599 600 /* check sa_family looks sane for the cmd */ 601 switch (cmd) { 602 case SIOCSIFPHYADDR: 603 if (src->sa_family == AF_INET) 604 break; 605 return EAFNOSUPPORT; 606 #ifdef INET6 607 case SIOCSIFPHYADDR_IN6: 608 if (src->sa_family == AF_INET6) 609 break; 610 return EAFNOSUPPORT; 611 #endif /* INET6 */ 612 case SIOCSLIFPHYADDR: 613 /* checks done in the above */ 614 break; 615 } 616 617 for (sc2 = LIST_FIRST(&gif_softc_list); sc2 != NULL; 618 sc2 = LIST_NEXT(sc2, gif_list)) { 619 if (sc2 == sc) 620 continue; 621 if (!sc2->gif_pdst || !sc2->gif_psrc) 622 continue; 623 if (sc2->gif_pdst->sa_family != dst->sa_family || 624 sc2->gif_pdst->sa_len != dst->sa_len || 625 sc2->gif_psrc->sa_family != src->sa_family || 626 sc2->gif_psrc->sa_len != src->sa_len) 627 continue; 628 629 /* can't configure same pair of address onto two gifs */ 630 if (bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 631 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 632 error = EADDRNOTAVAIL; 633 goto bad; 634 } 635 636 /* can't configure multiple multi-dest interfaces */ 637 #define multidest(x) \ 638 (((struct sockaddr_in *)(x))->sin_addr.s_addr == INADDR_ANY) 639 #ifdef INET6 640 #define multidest6(x) \ 641 (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)(x))->sin6_addr)) 642 #endif 643 if (dst->sa_family == AF_INET && 644 multidest(dst) && multidest(sc2->gif_pdst)) { 645 error = EADDRNOTAVAIL; 646 goto bad; 647 } 648 #ifdef INET6 649 if (dst->sa_family == AF_INET6 && 650 multidest6(dst) && multidest6(sc2->gif_pdst)) { 651 error = EADDRNOTAVAIL; 652 goto bad; 653 } 654 #endif 655 } 656 657 if (sc->gif_psrc) 658 free((caddr_t)sc->gif_psrc, M_IFADDR); 659 sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK); 660 bcopy((caddr_t)src, (caddr_t)sa, src->sa_len); 661 sc->gif_psrc = sa; 662 663 if (sc->gif_pdst) 664 free((caddr_t)sc->gif_pdst, M_IFADDR); 665 sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK); 666 bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len); 667 sc->gif_pdst = sa; 668 669 s = splsoftnet(); 670 ifp->if_flags |= IFF_RUNNING; 671 if_up(ifp); /* send up RTM_IFINFO */ 672 splx(s); 673 674 error = 0; 675 break; 676 677 #ifdef SIOCDIFPHYADDR 678 case SIOCDIFPHYADDR: 679 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 680 break; 681 gif_delete_tunnel(sc); 682 break; 683 #endif 684 685 case SIOCGIFPSRCADDR: 686 #ifdef INET6 687 case SIOCGIFPSRCADDR_IN6: 688 #endif /* INET6 */ 689 if (sc->gif_psrc == NULL) { 690 error = EADDRNOTAVAIL; 691 goto bad; 692 } 693 src = sc->gif_psrc; 694 switch (cmd) { 695 #ifdef INET 696 case SIOCGIFPSRCADDR: 697 dst = &ifr->ifr_addr; 698 size = sizeof(ifr->ifr_addr); 699 break; 700 #endif /* INET */ 701 #ifdef INET6 702 case SIOCGIFPSRCADDR_IN6: 703 dst = (struct sockaddr *) 704 &(((struct in6_ifreq *)data)->ifr_addr); 705 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 706 break; 707 #endif /* INET6 */ 708 default: 709 error = EADDRNOTAVAIL; 710 goto bad; 711 } 712 if (src->sa_len > size) 713 return EINVAL; 714 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 715 break; 716 717 case SIOCGIFPDSTADDR: 718 #ifdef INET6 719 case SIOCGIFPDSTADDR_IN6: 720 #endif /* INET6 */ 721 if (sc->gif_pdst == NULL) { 722 error = EADDRNOTAVAIL; 723 goto bad; 724 } 725 src = sc->gif_pdst; 726 switch (cmd) { 727 #ifdef INET 728 case SIOCGIFPDSTADDR: 729 dst = &ifr->ifr_addr; 730 size = sizeof(ifr->ifr_addr); 731 break; 732 #endif /* INET */ 733 #ifdef INET6 734 case SIOCGIFPDSTADDR_IN6: 735 dst = (struct sockaddr *) 736 &(((struct in6_ifreq *)data)->ifr_addr); 737 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 738 break; 739 #endif /* INET6 */ 740 default: 741 error = EADDRNOTAVAIL; 742 goto bad; 743 } 744 if (src->sa_len > size) 745 return EINVAL; 746 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 747 break; 748 749 case SIOCGLIFPHYADDR: 750 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 751 error = EADDRNOTAVAIL; 752 goto bad; 753 } 754 755 /* copy src */ 756 src = sc->gif_psrc; 757 dst = (struct sockaddr *) 758 &(((struct if_laddrreq *)data)->addr); 759 size = sizeof(((struct if_laddrreq *)data)->addr); 760 if (src->sa_len > size) 761 return EINVAL; 762 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); 763 764 /* copy dst */ 765 src = sc->gif_pdst; 766 dst = (struct sockaddr *) 767 &(((struct if_laddrreq *)data)->dstaddr); 768 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 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 SIOCSIFFLAGS: 775 /* if_ioctl() takes care of it */ 776 break; 777 778 default: 779 error = EINVAL; 780 break; 781 } 782 bad: 783 return error; 784 } 785 786 void 787 gif_delete_tunnel(sc) 788 struct gif_softc *sc; 789 { 790 int s; 791 792 s = splsoftnet(); 793 794 if (sc->gif_psrc) { 795 free((caddr_t)sc->gif_psrc, M_IFADDR); 796 sc->gif_psrc = NULL; 797 } 798 if (sc->gif_pdst) { 799 free((caddr_t)sc->gif_pdst, M_IFADDR); 800 sc->gif_pdst = NULL; 801 } 802 /* change the IFF_UP flag as well? */ 803 804 splx(s); 805 } 806 807 #ifdef ISO 808 struct eonhdr { 809 u_int8_t version; 810 u_int8_t class; 811 u_int16_t cksum; 812 }; 813 814 /* 815 * prepend EON header to ISO PDU 816 */ 817 static int 818 gif_eon_encap(struct mbuf **m) 819 { 820 struct eonhdr *ehdr; 821 822 M_PREPEND(*m, sizeof(*ehdr), M_DONTWAIT); 823 if (*m && (*m)->m_len < sizeof(*ehdr)) 824 *m = m_pullup(*m, sizeof(*ehdr)); 825 if (*m == NULL) { 826 printf("ENOBUFS in gif_eon_encap %d\n", __LINE__); 827 return ENOBUFS; 828 } 829 ehdr = mtod(*m, struct eonhdr *); 830 ehdr->version = 1; 831 ehdr->class = 0; /* always unicast */ 832 #if 0 833 /* calculate the checksum of the eonhdr */ 834 { 835 struct mbuf mhead; 836 memset(&mhead, 0, sizeof(mhead)); 837 ehdr->cksum = 0; 838 mhead.m_data = (caddr_t)ehdr; 839 mhead.m_len = sizeof(*ehdr); 840 mhead.m_next = 0; 841 iso_gen_csum(&mhead, offsetof(struct eonhdr, cksum), 842 mhead.m_len); 843 } 844 #else 845 /* since the data is always constant we'll just plug the value in */ 846 ehdr->cksum = htons(0xfc02); 847 #endif 848 return (0); 849 } 850 851 /* 852 * remove EON header and check checksum 853 */ 854 static int 855 gif_eon_decap(struct ifnet *gifp, struct mbuf **m) 856 { 857 struct eonhdr *ehdr; 858 859 if ((*m)->m_len < sizeof(*ehdr) && 860 (*m = m_pullup(*m, sizeof(*ehdr))) == 0) { 861 gifp->if_ierrors++; 862 return (EINVAL); 863 } 864 if (iso_check_csum(*m, sizeof(struct eonhdr))) 865 return (EINVAL); 866 m_adj(*m, sizeof(*ehdr)); 867 return (0); 868 } 869 #endif /*ISO*/ 870 #endif /*NGIF > 0*/ 871
Indexes created Fri Sep 26 08:10:20 GMT 2025