1 /* 2 * Copyright (c) 2001-2003 3 * Fraunhofer Institute for Open Communication Systems (FhG Fokus). 4 * All rights reserved. 5 * 6 * Author: Harti Brandt <harti@freebsd.org> 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 * 17 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $Begemot: bsnmp/snmp_mibII/mibII.c,v 1.20 2004/08/06 08:46:59 brandt Exp $ 30 * 31 * Implementation of the standard interfaces and ip MIB. 32 */ 33 #include "mibII.h" 34 #include "mibII_oid.h" 35 #include <net/if_types.h> 36 37 38 /*****************************/ 39 40 /* our module */ 41 static struct lmodule *module; 42 43 /* routing socket */ 44 static int route; 45 static void *route_fd; 46 47 /* if-index allocator */ 48 static uint32_t next_if_index = 1; 49 50 /* re-fetch arp table */ 51 static int update_arp; 52 static int in_update_arp; 53 54 /* OR registrations */ 55 static u_int ifmib_reg; 56 static u_int ipmib_reg; 57 static u_int tcpmib_reg; 58 static u_int udpmib_reg; 59 static u_int ipForward_reg; 60 61 /*****************************/ 62 63 /* list of all IP addresses */ 64 struct mibifa_list mibifa_list = TAILQ_HEAD_INITIALIZER(mibifa_list); 65 66 /* list of all interfaces */ 67 struct mibif_list mibif_list = TAILQ_HEAD_INITIALIZER(mibif_list); 68 69 /* list of dynamic interface names */ 70 struct mibdynif_list mibdynif_list = SLIST_HEAD_INITIALIZER(mibdynif_list); 71 72 /* list of all interface index mappings */ 73 struct mibindexmap_list mibindexmap_list = STAILQ_HEAD_INITIALIZER(mibindexmap_list); 74 75 /* list of all stacking entries */ 76 struct mibifstack_list mibifstack_list = TAILQ_HEAD_INITIALIZER(mibifstack_list); 77 78 /* list of all receive addresses */ 79 struct mibrcvaddr_list mibrcvaddr_list = TAILQ_HEAD_INITIALIZER(mibrcvaddr_list); 80 81 /* list of all NetToMedia entries */ 82 struct mibarp_list mibarp_list = TAILQ_HEAD_INITIALIZER(mibarp_list); 83 84 /* number of interfaces */ 85 int32_t mib_if_number; 86 87 /* last change of table */ 88 uint32_t mib_iftable_last_change; 89 90 /* last change of stack table */ 91 uint32_t mib_ifstack_last_change; 92 93 /* if this is set, one of our lists may be bad. refresh them when idle */ 94 int mib_iflist_bad; 95 96 /* network socket */ 97 int mib_netsock; 98 99 /* last time refreshed */ 100 uint32_t mibarpticks; 101 102 /* info on system clocks */ 103 struct clockinfo clockinfo; 104 105 /* list of all New if registrations */ 106 static struct newifreg_list newifreg_list = TAILQ_HEAD_INITIALIZER(newifreg_list); 107 108 /*****************************/ 109 110 static const struct asn_oid oid_ifMIB = OIDX_ifMIB; 111 static const struct asn_oid oid_ipMIB = OIDX_ipMIB; 112 static const struct asn_oid oid_tcpMIB = OIDX_tcpMIB; 113 static const struct asn_oid oid_udpMIB = OIDX_udpMIB; 114 static const struct asn_oid oid_ipForward = OIDX_ipForward; 115 static const struct asn_oid oid_linkDown = OIDX_linkDown; 116 static const struct asn_oid oid_linkUp = OIDX_linkUp; 117 static const struct asn_oid oid_ifIndex = OIDX_ifIndex; 118 119 /*****************************/ 120 121 /* 122 * Find an interface 123 */ 124 struct mibif * 125 mib_find_if(u_int idx) 126 { 127 struct mibif *ifp; 128 129 TAILQ_FOREACH(ifp, &mibif_list, link) 130 if (ifp->index == idx) 131 return (ifp); 132 return (NULL); 133 } 134 135 struct mibif * 136 mib_find_if_sys(u_int sysindex) 137 { 138 struct mibif *ifp; 139 140 TAILQ_FOREACH(ifp, &mibif_list, link) 141 if (ifp->sysindex == sysindex) 142 return (ifp); 143 return (NULL); 144 } 145 146 struct mibif * 147 mib_find_if_name(const char *name) 148 { 149 struct mibif *ifp; 150 151 TAILQ_FOREACH(ifp, &mibif_list, link) 152 if (strcmp(ifp->name, name) == 0) 153 return (ifp); 154 return (NULL); 155 } 156 157 /* 158 * Check whether an interface is dynamic. The argument may include the 159 * unit number. This assumes, that the name part does NOT contain digits. 160 */ 161 int 162 mib_if_is_dyn(const char *name) 163 { 164 size_t len; 165 struct mibdynif *d; 166 167 for (len = 0; name[len] != '\0' && isalpha(name[len]) ; len++) 168 ; 169 SLIST_FOREACH(d, &mibdynif_list, link) 170 if (strlen(d->name) == len && strncmp(d->name, name, len) == 0) 171 return (1); 172 return (0); 173 } 174 175 /* set an interface name to dynamic mode */ 176 void 177 mib_if_set_dyn(const char *name) 178 { 179 struct mibdynif *d; 180 181 SLIST_FOREACH(d, &mibdynif_list, link) 182 if (strcmp(name, d->name) == 0) 183 return; 184 if ((d = malloc(sizeof(*d))) == NULL) 185 err(1, NULL); 186 strcpy(d->name, name); 187 SLIST_INSERT_HEAD(&mibdynif_list, d, link); 188 } 189 190 /* 191 * register for interface creations 192 */ 193 int 194 mib_register_newif(int (*func)(struct mibif *), const struct lmodule *mod) 195 { 196 struct newifreg *reg; 197 198 TAILQ_FOREACH(reg, &newifreg_list, link) 199 if (reg->mod == mod) { 200 reg->func = func; 201 return (0); 202 } 203 if ((reg = malloc(sizeof(*reg))) == NULL) { 204 syslog(LOG_ERR, "newifreg: %m"); 205 return (-1); 206 } 207 reg->mod = mod; 208 reg->func = func; 209 TAILQ_INSERT_TAIL(&newifreg_list, reg, link); 210 211 return (0); 212 } 213 214 void 215 mib_unregister_newif(const struct lmodule *mod) 216 { 217 struct newifreg *reg; 218 219 TAILQ_FOREACH(reg, &newifreg_list, link) 220 if (reg->mod == mod) { 221 TAILQ_REMOVE(&newifreg_list, reg, link); 222 free(reg); 223 return; 224 } 225 226 } 227 228 struct mibif * 229 mib_first_if(void) 230 { 231 return (TAILQ_FIRST(&mibif_list)); 232 } 233 struct mibif * 234 mib_next_if(const struct mibif *ifp) 235 { 236 return (TAILQ_NEXT(ifp, link)); 237 } 238 239 /* 240 * Change the admin status of an interface 241 */ 242 int 243 mib_if_admin(struct mibif *ifp, int up) 244 { 245 struct ifreq ifr; 246 247 strncpy(ifr.ifr_name, ifp->name, sizeof(ifr.ifr_name)); 248 if (ioctl(mib_netsock, SIOCGIFFLAGS, &ifr) == -1) { 249 syslog(LOG_ERR, "SIOCGIFFLAGS(%s): %m", ifp->name); 250 return (-1); 251 } 252 if (up) 253 ifr.ifr_flags |= IFF_UP; 254 else 255 ifr.ifr_flags &= ~IFF_UP; 256 if (ioctl(mib_netsock, SIOCSIFFLAGS, &ifr) == -1) { 257 syslog(LOG_ERR, "SIOCSIFFLAGS(%s): %m", ifp->name); 258 return (-1); 259 } 260 261 (void)mib_fetch_ifmib(ifp); 262 263 return (0); 264 } 265 266 /* 267 * Generate a link up/down trap 268 */ 269 static void 270 link_trap(struct mibif *ifp, int up) 271 { 272 struct snmp_value ifindex; 273 274 ifindex.var = oid_ifIndex; 275 ifindex.var.subs[ifindex.var.len++] = ifp->index; 276 ifindex.syntax = SNMP_SYNTAX_INTEGER; 277 ifindex.v.integer = ifp->index; 278 279 snmp_send_trap(up ? &oid_linkUp : &oid_linkDown, &ifindex, 280 (struct snmp_value *)NULL); 281 } 282 283 /* 284 * Fetch new MIB data. 285 */ 286 int 287 mib_fetch_ifmib(struct mibif *ifp) 288 { 289 int name[6]; 290 size_t len; 291 void *newmib; 292 struct ifmibdata oldmib = ifp->mib; 293 294 name[0] = CTL_NET; 295 name[1] = PF_LINK; 296 name[2] = NETLINK_GENERIC; 297 name[3] = IFMIB_IFDATA; 298 name[4] = ifp->sysindex; 299 name[5] = IFDATA_GENERAL; 300 301 len = sizeof(ifp->mib); 302 if (sysctl(name, 6, &ifp->mib, &len, NULL, 0) == -1) { 303 if (errno != ENOENT) 304 syslog(LOG_WARNING, "sysctl(ifmib, %s) failed %m", 305 ifp->name); 306 return (-1); 307 } 308 309 if (ifp->trap_enable) { 310 if (!(oldmib.ifmd_flags & IFF_UP)) { 311 if (ifp->mib.ifmd_flags & IFF_UP) 312 link_trap(ifp, 1); 313 } else { 314 if (!(ifp->mib.ifmd_flags & IFF_UP)) 315 link_trap(ifp, 0); 316 } 317 } 318 319 ifp->flags &= ~(MIBIF_HIGHSPEED | MIBIF_VERYHIGHSPEED); 320 if (ifp->mib.ifmd_data.ifi_baudrate > 20000000) { 321 ifp->flags |= MIBIF_HIGHSPEED; 322 if (ifp->mib.ifmd_data.ifi_baudrate > 650000000) 323 ifp->flags |= MIBIF_VERYHIGHSPEED; 324 } 325 326 /* 327 * linkspecific MIB 328 */ 329 name[5] = IFDATA_LINKSPECIFIC; 330 if (sysctl(name, 6, NULL, &len, NULL, 0) == -1) { 331 syslog(LOG_WARNING, "sysctl linkmib estimate (%s): %m", 332 ifp->name); 333 if (ifp->specmib != NULL) { 334 ifp->specmib = NULL; 335 ifp->specmiblen = 0; 336 } 337 goto out; 338 } 339 if (len == 0) { 340 if (ifp->specmib != NULL) { 341 ifp->specmib = NULL; 342 ifp->specmiblen = 0; 343 } 344 goto out; 345 } 346 347 if (ifp->specmiblen != len) { 348 if ((newmib = realloc(ifp->specmib, len)) == NULL) { 349 ifp->specmib = NULL; 350 ifp->specmiblen = 0; 351 goto out; 352 } 353 ifp->specmib = newmib; 354 ifp->specmiblen = len; 355 } 356 if (sysctl(name, 6, ifp->specmib, &len, NULL, 0) == -1) { 357 syslog(LOG_WARNING, "sysctl linkmib (%s): %m", ifp->name); 358 if (ifp->specmib != NULL) { 359 ifp->specmib = NULL; 360 ifp->specmiblen = 0; 361 } 362 } 363 364 out: 365 ifp->mibtick = get_ticks(); 366 return (0); 367 } 368 369 /* find first/next address for a given interface */ 370 struct mibifa * 371 mib_first_ififa(const struct mibif *ifp) 372 { 373 struct mibifa *ifa; 374 375 TAILQ_FOREACH(ifa, &mibifa_list, link) 376 if (ifp->index == ifa->ifindex) 377 return (ifa); 378 return (NULL); 379 } 380 381 struct mibifa * 382 mib_next_ififa(struct mibifa *ifa0) 383 { 384 struct mibifa *ifa; 385 386 ifa = ifa0; 387 while ((ifa = TAILQ_NEXT(ifa, link)) != NULL) 388 if (ifa->ifindex == ifa0->ifindex) 389 return (ifa); 390 return (NULL); 391 } 392 393 /* 394 * Allocate a new IFA 395 */ 396 static struct mibifa * 397 alloc_ifa(u_int ifindex, struct in_addr addr) 398 { 399 struct mibifa *ifa; 400 uint32_t ha; 401 402 if ((ifa = malloc(sizeof(struct mibifa))) == NULL) { 403 syslog(LOG_ERR, "ifa: %m"); 404 return (NULL); 405 } 406 ifa->inaddr = addr; 407 ifa->ifindex = ifindex; 408 409 ha = ntohl(ifa->inaddr.s_addr); 410 ifa->index.len = 4; 411 ifa->index.subs[0] = (ha >> 24) & 0xff; 412 ifa->index.subs[1] = (ha >> 16) & 0xff; 413 ifa->index.subs[2] = (ha >> 8) & 0xff; 414 ifa->index.subs[3] = (ha >> 0) & 0xff; 415 416 ifa->flags = 0; 417 ifa->inbcast.s_addr = 0; 418 ifa->inmask.s_addr = 0xffffffff; 419 420 INSERT_OBJECT_OID(ifa, &mibifa_list); 421 422 return (ifa); 423 } 424 425 /* 426 * Delete an interface address 427 */ 428 static void 429 destroy_ifa(struct mibifa *ifa) 430 { 431 TAILQ_REMOVE(&mibifa_list, ifa, link); 432 free(ifa); 433 } 434 435 436 /* 437 * Helper routine to extract the sockaddr structures from a routing 438 * socket message. 439 */ 440 void 441 mib_extract_addrs(int addrs, u_char *info, struct sockaddr **out) 442 { 443 u_int i; 444 445 for (i = 0; i < RTAX_MAX; i++) { 446 if ((addrs & (1 << i)) != 0) { 447 *out = (struct sockaddr *)info; 448 info += roundup((*out)->sa_len, sizeof(long)); 449 } else 450 *out = NULL; 451 out++; 452 } 453 } 454 455 /* 456 * save the phys address of an interface. Handle receive address entries here. 457 */ 458 static void 459 get_physaddr(struct mibif *ifp, struct sockaddr_dl *sdl, u_char *ptr) 460 { 461 u_char *np; 462 struct mibrcvaddr *rcv; 463 464 if (sdl->sdl_alen == 0) { 465 /* no address */ 466 if (ifp->physaddrlen != 0) { 467 if ((rcv = mib_find_rcvaddr(ifp->index, ifp->physaddr, 468 ifp->physaddrlen)) != NULL) 469 mib_rcvaddr_delete(rcv); 470 free(ifp->physaddr); 471 ifp->physaddr = NULL; 472 ifp->physaddrlen = 0; 473 } 474 return; 475 } 476 477 if (ifp->physaddrlen != sdl->sdl_alen) { 478 /* length changed */ 479 if (ifp->physaddrlen) { 480 /* delete olf receive address */ 481 if ((rcv = mib_find_rcvaddr(ifp->index, ifp->physaddr, 482 ifp->physaddrlen)) != NULL) 483 mib_rcvaddr_delete(rcv); 484 } 485 if ((np = realloc(ifp->physaddr, sdl->sdl_alen)) == NULL) { 486 free(ifp->physaddr); 487 ifp->physaddr = NULL; 488 ifp->physaddrlen = 0; 489 return; 490 } 491 ifp->physaddr = np; 492 ifp->physaddrlen = sdl->sdl_alen; 493 494 } else if (memcmp(ifp->physaddr, ptr, ifp->physaddrlen) == 0) { 495 /* no change */ 496 return; 497 498 } else { 499 /* address changed */ 500 501 /* delete olf receive address */ 502 if ((rcv = mib_find_rcvaddr(ifp->index, ifp->physaddr, 503 ifp->physaddrlen)) != NULL) 504 mib_rcvaddr_delete(rcv); 505 } 506 507 memcpy(ifp->physaddr, ptr, ifp->physaddrlen); 508 509 /* make new receive address */ 510 if ((rcv = mib_rcvaddr_create(ifp, ifp->physaddr, ifp->physaddrlen)) != NULL) 511 rcv->flags |= MIBRCVADDR_HW; 512 } 513 514 /* 515 * Free an interface 516 */ 517 static void 518 mibif_free(struct mibif *ifp) 519 { 520 struct mibindexmap *map; 521 struct mibifa *ifa, *ifa1; 522 struct mibrcvaddr *rcv, *rcv1; 523 struct mibarp *at, *at1; 524 525 if (ifp->xnotify != NULL) 526 (*ifp->xnotify)(ifp, MIBIF_NOTIFY_DESTROY, ifp->xnotify_data); 527 528 (void)mib_ifstack_delete(ifp, NULL); 529 (void)mib_ifstack_delete(NULL, ifp); 530 531 TAILQ_REMOVE(&mibif_list, ifp, link); 532 if (ifp->physaddr != NULL) 533 free(ifp->physaddr); 534 if (ifp->specmib != NULL) 535 free(ifp->specmib); 536 537 STAILQ_FOREACH(map, &mibindexmap_list, link) 538 if (map->mibif == ifp) { 539 map->mibif = NULL; 540 break; 541 } 542 543 /* purge interface addresses */ 544 ifa = TAILQ_FIRST(&mibifa_list); 545 while (ifa != NULL) { 546 ifa1 = TAILQ_NEXT(ifa, link); 547 if (ifa->ifindex == ifp->index) 548 destroy_ifa(ifa); 549 ifa = ifa1; 550 } 551 552 /* purge receive addresses */ 553 rcv = TAILQ_FIRST(&mibrcvaddr_list); 554 while (rcv != NULL) { 555 rcv1 = TAILQ_NEXT(rcv, link); 556 if (rcv->ifindex == ifp->index) 557 mib_rcvaddr_delete(rcv); 558 rcv = rcv1; 559 } 560 561 /* purge ARP entries */ 562 at = TAILQ_FIRST(&mibarp_list); 563 while (at != NULL) { 564 at1 = TAILQ_NEXT(at, link); 565 if (at->index.subs[0] == ifp->index) 566 mib_arp_delete(at); 567 at = at1; 568 } 569 570 571 free(ifp); 572 mib_if_number--; 573 mib_iftable_last_change = this_tick; 574 } 575 576 /* 577 * Create a new interface 578 */ 579 static struct mibif * 580 mibif_create(u_int sysindex, const char *name) 581 { 582 struct mibif *ifp; 583 struct mibindexmap *map; 584 585 if ((ifp = malloc(sizeof(*ifp))) == NULL) { 586 syslog(LOG_WARNING, "%s: %m", __func__); 587 return (NULL); 588 } 589 memset(ifp, 0, sizeof(*ifp)); 590 ifp->sysindex = sysindex; 591 strcpy(ifp->name, name); 592 strcpy(ifp->descr, name); 593 594 map = NULL; 595 if (!mib_if_is_dyn(ifp->name)) { 596 /* non-dynamic. look whether we know the interface */ 597 STAILQ_FOREACH(map, &mibindexmap_list, link) 598 if (strcmp(map->name, ifp->name) == 0) { 599 ifp->index = map->ifindex; 600 map->mibif = ifp; 601 break; 602 } 603 /* assume it has a connector if it is not dynamic */ 604 ifp->has_connector = 1; 605 ifp->trap_enable = 1; 606 } 607 if (map == NULL) { 608 /* new interface - get new index */ 609 if (next_if_index > 0x7fffffff) 610 errx(1, "ifindex wrap"); 611 612 if ((map = malloc(sizeof(*map))) == NULL) { 613 syslog(LOG_ERR, "ifmap: %m"); 614 free(ifp); 615 return (NULL); 616 } 617 map->ifindex = next_if_index++; 618 map->sysindex = ifp->sysindex; 619 strcpy(map->name, ifp->name); 620 map->mibif = ifp; 621 STAILQ_INSERT_TAIL(&mibindexmap_list, map, link); 622 } else { 623 /* re-instantiate. Introduce a counter discontinuity */ 624 ifp->counter_disc = get_ticks(); 625 } 626 ifp->index = map->ifindex; 627 628 INSERT_OBJECT_INT(ifp, &mibif_list); 629 mib_if_number++; 630 mib_iftable_last_change = this_tick; 631 632 /* instantiate default ifStack entries */ 633 (void)mib_ifstack_create(ifp, NULL); 634 (void)mib_ifstack_create(NULL, ifp); 635 636 return (ifp); 637 } 638 639 /* 640 * Inform all interested parties about a new interface 641 */ 642 static void 643 notify_newif(struct mibif *ifp) 644 { 645 struct newifreg *reg; 646 647 TAILQ_FOREACH(reg, &newifreg_list, link) 648 if ((*reg->func)(ifp)) 649 return; 650 } 651 652 /* 653 * This is called for new interfaces after we have fetched the interface 654 * MIB. If this is a broadcast interface try to guess the broadcast address 655 * depending on the interface type. 656 */ 657 static void 658 check_llbcast(struct mibif *ifp) 659 { 660 static u_char ether_bcast[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 661 static u_char arcnet_bcast = 0; 662 struct mibrcvaddr *rcv; 663 664 if (!(ifp->mib.ifmd_flags & IFF_BROADCAST)) 665 return; 666 667 switch (ifp->mib.ifmd_data.ifi_type) { 668 669 case IFT_ETHER: 670 case IFT_FDDI: 671 case IFT_ISO88025: 672 if (mib_find_rcvaddr(ifp->index, ether_bcast, 6) == NULL && 673 (rcv = mib_rcvaddr_create(ifp, ether_bcast, 6)) != NULL) 674 rcv->flags |= MIBRCVADDR_BCAST; 675 break; 676 677 case IFT_ARCNET: 678 if (mib_find_rcvaddr(ifp->index, &arcnet_bcast, 1) == NULL && 679 (rcv = mib_rcvaddr_create(ifp, &arcnet_bcast, 1)) != NULL) 680 rcv->flags |= MIBRCVADDR_BCAST; 681 break; 682 } 683 } 684 685 686 /* 687 * Retrieve the current interface list from the system. 688 */ 689 void 690 mib_refresh_iflist(void) 691 { 692 struct mibif *ifp, *ifp1; 693 size_t len; 694 u_short idx; 695 int name[6]; 696 int count; 697 struct ifmibdata mib; 698 699 TAILQ_FOREACH(ifp, &mibif_list, link) 700 ifp->flags &= ~MIBIF_FOUND; 701 702 len = sizeof(count); 703 if (sysctlbyname("net.link.generic.system.ifcount", &count, &len, 704 NULL, 0) == -1) { 705 syslog(LOG_ERR, "ifcount: %m"); 706 return; 707 } 708 name[0] = CTL_NET; 709 name[1] = PF_LINK; 710 name[2] = NETLINK_GENERIC; 711 name[3] = IFMIB_IFDATA; 712 name[5] = IFDATA_GENERAL; 713 for (idx = 1; idx <= count; idx++) { 714 name[4] = idx; 715 len = sizeof(mib); 716 if (sysctl(name, 6, &mib, &len, NULL, 0) == -1) { 717 if (errno == ENOENT) 718 continue; 719 syslog(LOG_ERR, "ifmib(%u): %m", idx); 720 return; 721 } 722 if ((ifp = mib_find_if_sys(idx)) != NULL) { 723 ifp->flags |= MIBIF_FOUND; 724 continue; 725 } 726 /* Unknown interface - create */ 727 if ((ifp = mibif_create(idx, mib.ifmd_name)) != NULL) { 728 ifp->flags |= MIBIF_FOUND; 729 (void)mib_fetch_ifmib(ifp); 730 check_llbcast(ifp); 731 notify_newif(ifp); 732 } 733 } 734 735 /* 736 * Purge interfaces that disappeared 737 */ 738 ifp = TAILQ_FIRST(&mibif_list); 739 while (ifp != NULL) { 740 ifp1 = TAILQ_NEXT(ifp, link); 741 if (!(ifp->flags & MIBIF_FOUND)) 742 mibif_free(ifp); 743 ifp = ifp1; 744 } 745 } 746 747 /* 748 * Find an interface address 749 */ 750 struct mibifa * 751 mib_find_ifa(struct in_addr addr) 752 { 753 struct mibifa *ifa; 754 755 TAILQ_FOREACH(ifa, &mibifa_list, link) 756 if (ifa->inaddr.s_addr == addr.s_addr) 757 return (ifa); 758 return (NULL); 759 } 760 761 /* 762 * Process a new ARP entry 763 */ 764 static void 765 process_arp(const struct rt_msghdr *rtm, const struct sockaddr_dl *sdl, 766 const struct sockaddr_in *sa) 767 { 768 struct mibif *ifp; 769 struct mibarp *at; 770 771 /* IP arp table entry */ 772 if (sdl->sdl_alen == 0) { 773 update_arp = 1; 774 return; 775 } 776 if ((ifp = mib_find_if_sys(sdl->sdl_index)) == NULL) 777 return; 778 /* have a valid entry */ 779 if ((at = mib_find_arp(ifp, sa->sin_addr)) == NULL && 780 (at = mib_arp_create(ifp, sa->sin_addr, 781 sdl->sdl_data + sdl->sdl_nlen, sdl->sdl_alen)) == NULL) 782 return; 783 784 if (rtm->rtm_rmx.rmx_expire == 0) 785 at->flags |= MIBARP_PERM; 786 else 787 at->flags &= ~MIBARP_PERM; 788 at->flags |= MIBARP_FOUND; 789 } 790 791 /* 792 * Handle a routing socket message. 793 */ 794 static void 795 handle_rtmsg(struct rt_msghdr *rtm) 796 { 797 struct sockaddr *addrs[RTAX_MAX]; 798 struct if_msghdr *ifm; 799 struct ifa_msghdr *ifam; 800 struct ifma_msghdr *ifmam; 801 #ifdef RTM_IFANNOUNCE 802 struct if_announcemsghdr *ifan; 803 #endif 804 struct mibif *ifp; 805 struct sockaddr_dl *sdl; 806 struct sockaddr_in *sa; 807 struct mibifa *ifa; 808 struct mibrcvaddr *rcv; 809 u_char *ptr; 810 811 if (rtm->rtm_version != RTM_VERSION) { 812 syslog(LOG_ERR, "Bogus RTM version %u", rtm->rtm_version); 813 return; 814 } 815 816 switch (rtm->rtm_type) { 817 818 case RTM_NEWADDR: 819 ifam = (struct ifa_msghdr *)rtm; 820 mib_extract_addrs(ifam->ifam_addrs, (u_char *)(ifam + 1), addrs); 821 if (addrs[RTAX_IFA] == NULL || addrs[RTAX_NETMASK] == NULL) 822 break; 823 824 sa = (struct sockaddr_in *)(void *)addrs[RTAX_IFA]; 825 if ((ifa = mib_find_ifa(sa->sin_addr)) == NULL) { 826 /* unknown address */ 827 if ((ifp = mib_find_if_sys(ifam->ifam_index)) == NULL) { 828 syslog(LOG_WARNING, "RTM_NEWADDR for unknown " 829 "interface %u", ifam->ifam_index); 830 break; 831 } 832 if ((ifa = alloc_ifa(ifp->index, sa->sin_addr)) == NULL) 833 break; 834 } 835 sa = (struct sockaddr_in *)(void *)addrs[RTAX_NETMASK]; 836 ifa->inmask = sa->sin_addr; 837 838 if (addrs[RTAX_BRD] != NULL) { 839 sa = (struct sockaddr_in *)(void *)addrs[RTAX_BRD]; 840 ifa->inbcast = sa->sin_addr; 841 } 842 ifa->flags |= MIBIFA_FOUND; 843 break; 844 845 case RTM_DELADDR: 846 ifam = (struct ifa_msghdr *)rtm; 847 mib_extract_addrs(ifam->ifam_addrs, (u_char *)(ifam + 1), addrs); 848 if (addrs[RTAX_IFA] == NULL) 849 break; 850 851 sa = (struct sockaddr_in *)(void *)addrs[RTAX_IFA]; 852 if ((ifa = mib_find_ifa(sa->sin_addr)) != NULL) { 853 ifa->flags |= MIBIFA_FOUND; 854 if (!(ifa->flags & MIBIFA_DESTROYED)) 855 destroy_ifa(ifa); 856 } 857 break; 858 859 case RTM_NEWMADDR: 860 ifmam = (struct ifma_msghdr *)rtm; 861 mib_extract_addrs(ifmam->ifmam_addrs, (u_char *)(ifmam + 1), addrs); 862 if (addrs[RTAX_IFA] == NULL || 863 addrs[RTAX_IFA]->sa_family != AF_LINK) 864 break; 865 sdl = (struct sockaddr_dl *)(void *)addrs[RTAX_IFA]; 866 if ((rcv = mib_find_rcvaddr(sdl->sdl_index, 867 sdl->sdl_data + sdl->sdl_nlen, sdl->sdl_alen)) == NULL) { 868 /* unknown address */ 869 if ((ifp = mib_find_if_sys(sdl->sdl_index)) == NULL) { 870 syslog(LOG_WARNING, "RTM_NEWMADDR for unknown " 871 "interface %u", sdl->sdl_index); 872 break; 873 } 874 if ((rcv = mib_rcvaddr_create(ifp, 875 sdl->sdl_data + sdl->sdl_nlen, sdl->sdl_alen)) == NULL) 876 break; 877 rcv->flags |= MIBRCVADDR_VOLATILE; 878 } 879 rcv->flags |= MIBRCVADDR_FOUND; 880 break; 881 882 case RTM_DELMADDR: 883 ifmam = (struct ifma_msghdr *)rtm; 884 mib_extract_addrs(ifmam->ifmam_addrs, (u_char *)(ifmam + 1), addrs); 885 if (addrs[RTAX_IFA] == NULL || 886 addrs[RTAX_IFA]->sa_family != AF_LINK) 887 break; 888 sdl = (struct sockaddr_dl *)(void *)addrs[RTAX_IFA]; 889 if ((rcv = mib_find_rcvaddr(sdl->sdl_index, 890 sdl->sdl_data + sdl->sdl_nlen, sdl->sdl_alen)) != NULL) 891 mib_rcvaddr_delete(rcv); 892 break; 893 894 case RTM_IFINFO: 895 ifm = (struct if_msghdr *)rtm; 896 mib_extract_addrs(ifm->ifm_addrs, (u_char *)(ifm + 1), addrs); 897 if ((ifp = mib_find_if_sys(ifm->ifm_index)) == NULL) 898 break; 899 if (addrs[RTAX_IFP] != NULL && 900 addrs[RTAX_IFP]->sa_family == AF_LINK) { 901 sdl = (struct sockaddr_dl *)(void *)addrs[RTAX_IFP]; 902 ptr = sdl->sdl_data + sdl->sdl_nlen; 903 get_physaddr(ifp, sdl, ptr); 904 } 905 (void)mib_fetch_ifmib(ifp); 906 break; 907 908 #ifdef RTM_IFANNOUNCE 909 case RTM_IFANNOUNCE: 910 ifan = (struct if_announcemsghdr *)rtm; 911 ifp = mib_find_if_sys(ifan->ifan_index); 912 913 switch (ifan->ifan_what) { 914 915 case IFAN_ARRIVAL: 916 if (ifp == NULL && (ifp = mibif_create(ifan->ifan_index, 917 ifan->ifan_name)) != NULL) { 918 (void)mib_fetch_ifmib(ifp); 919 check_llbcast(ifp); 920 notify_newif(ifp); 921 } 922 break; 923 924 case IFAN_DEPARTURE: 925 if (ifp != NULL) 926 mibif_free(ifp); 927 break; 928 } 929 break; 930 #endif 931 932 case RTM_GET: 933 mib_extract_addrs(rtm->rtm_addrs, (u_char *)(rtm + 1), addrs); 934 if (rtm->rtm_flags & RTF_LLINFO) { 935 if (addrs[RTAX_DST] == NULL || 936 addrs[RTAX_GATEWAY] == NULL || 937 addrs[RTAX_DST]->sa_family != AF_INET || 938 addrs[RTAX_GATEWAY]->sa_family != AF_LINK) 939 break; 940 process_arp(rtm, 941 (struct sockaddr_dl *)(void *)addrs[RTAX_GATEWAY], 942 (struct sockaddr_in *)(void *)addrs[RTAX_DST]); 943 } 944 break; 945 946 case RTM_ADD: 947 mib_extract_addrs(rtm->rtm_addrs, (u_char *)(rtm + 1), addrs); 948 if (rtm->rtm_flags & RTF_LLINFO) { 949 if (addrs[RTAX_DST] == NULL || 950 addrs[RTAX_GATEWAY] == NULL || 951 addrs[RTAX_DST]->sa_family != AF_INET || 952 addrs[RTAX_GATEWAY]->sa_family != AF_LINK) 953 break; 954 process_arp(rtm, 955 (struct sockaddr_dl *)(void *)addrs[RTAX_GATEWAY], 956 (struct sockaddr_in *)(void *)addrs[RTAX_DST]); 957 } 958 break; 959 } 960 } 961 962 /* 963 * Fetch the routing table via sysctl 964 */ 965 u_char * 966 mib_fetch_rtab(int af, int info, int arg, size_t *lenp) 967 { 968 int name[6]; 969 u_char *buf; 970 971 name[0] = CTL_NET; 972 name[1] = PF_ROUTE; 973 name[2] = 0; 974 name[3] = af; 975 name[4] = info; 976 name[5] = arg; 977 978 *lenp = 0; 979 980 if (sysctl(name, 6, NULL, lenp, NULL, 0) == -1) { 981 syslog(LOG_ERR, "sysctl estimate (%d,%d,%d,%d,%d,%d): %m", 982 name[0], name[1], name[2], name[3], name[4], name[5]); 983 return (NULL); 984 } 985 if (*lenp == 0) 986 return (NULL); 987 988 if ((buf = malloc(*lenp)) == NULL) { 989 syslog(LOG_ERR, "sysctl buffer: %m"); 990 return (NULL); 991 } 992 993 if (sysctl(name, 6, buf, lenp, NULL, 0) == -1) { 994 syslog(LOG_ERR, "sysctl get: %m"); 995 free(buf); 996 return (NULL); 997 } 998 999 return (buf); 1000 } 1001 1002 /* 1003 * Update the following info: interface, interface addresses, interface 1004 * receive addresses, arp-table. 1005 * This does not change the interface list itself. 1006 */ 1007 static void 1008 update_ifa_info(void) 1009 { 1010 u_char *buf, *next; 1011 struct rt_msghdr *rtm; 1012 struct mibifa *ifa, *ifa1; 1013 struct mibrcvaddr *rcv, *rcv1; 1014 size_t needed; 1015 static const int infos[][3] = { 1016 { 0, NET_RT_IFLIST, 0 }, 1017 #ifdef NET_RT_IFMALIST 1018 { AF_LINK, NET_RT_IFMALIST, 0 }, 1019 #endif 1020 }; 1021 u_int i; 1022 1023 TAILQ_FOREACH(ifa, &mibifa_list, link) 1024 ifa->flags &= ~MIBIFA_FOUND; 1025 TAILQ_FOREACH(rcv, &mibrcvaddr_list, link) 1026 rcv->flags &= ~MIBRCVADDR_FOUND; 1027 1028 for (i = 0; i < sizeof(infos) / sizeof(infos[0]); i++) { 1029 if ((buf = mib_fetch_rtab(infos[i][0], infos[i][1], infos[i][2], 1030 &needed)) == NULL) 1031 continue; 1032 1033 next = buf; 1034 while (next < buf + needed) { 1035 rtm = (struct rt_msghdr *)(void *)next; 1036 next += rtm->rtm_msglen; 1037 handle_rtmsg(rtm); 1038 } 1039 free(buf); 1040 } 1041 1042 /* 1043 * Purge the address list of unused entries. These may happen for 1044 * interface aliases that are on the same subnet. We don't receive 1045 * routing socket messages for them. 1046 */ 1047 ifa = TAILQ_FIRST(&mibifa_list); 1048 while (ifa != NULL) { 1049 ifa1 = TAILQ_NEXT(ifa, link); 1050 if (!(ifa->flags & MIBIFA_FOUND)) 1051 destroy_ifa(ifa); 1052 ifa = ifa1; 1053 } 1054 1055 rcv = TAILQ_FIRST(&mibrcvaddr_list); 1056 while (rcv != NULL) { 1057 rcv1 = TAILQ_NEXT(rcv, link); 1058 if (!(rcv->flags & (MIBRCVADDR_FOUND | MIBRCVADDR_BCAST | 1059 MIBRCVADDR_HW))) 1060 mib_rcvaddr_delete(rcv); 1061 rcv = rcv1; 1062 } 1063 } 1064 1065 /* 1066 * Update arp table 1067 */ 1068 void 1069 mib_arp_update(void) 1070 { 1071 struct mibarp *at, *at1; 1072 size_t needed; 1073 u_char *buf, *next; 1074 struct rt_msghdr *rtm; 1075 1076 if (in_update_arp) 1077 return; /* Aaargh */ 1078 in_update_arp = 1; 1079 1080 TAILQ_FOREACH(at, &mibarp_list, link) 1081 at->flags &= ~MIBARP_FOUND; 1082 1083 if ((buf = mib_fetch_rtab(AF_INET, NET_RT_FLAGS, RTF_LLINFO, &needed)) == NULL) { 1084 in_update_arp = 0; 1085 return; 1086 } 1087 1088 next = buf; 1089 while (next < buf + needed) { 1090 rtm = (struct rt_msghdr *)(void *)next; 1091 next += rtm->rtm_msglen; 1092 handle_rtmsg(rtm); 1093 } 1094 free(buf); 1095 1096 at = TAILQ_FIRST(&mibarp_list); 1097 while (at != NULL) { 1098 at1 = TAILQ_NEXT(at, link); 1099 if (!(at->flags & MIBARP_FOUND)) 1100 mib_arp_delete(at); 1101 at = at1; 1102 } 1103 mibarpticks = get_ticks(); 1104 update_arp = 0; 1105 in_update_arp = 0; 1106 } 1107 1108 1109 /* 1110 * Intput on the routing socket. 1111 */ 1112 static void 1113 route_input(int fd, void *udata __unused) 1114 { 1115 u_char buf[1024 * 16]; 1116 ssize_t n; 1117 struct rt_msghdr *rtm; 1118 1119 if ((n = read(fd, buf, sizeof(buf))) == -1) 1120 err(1, "read(rt_socket)"); 1121 1122 if (n == 0) 1123 errx(1, "EOF on rt_socket"); 1124 1125 rtm = (struct rt_msghdr *)(void *)buf; 1126 if ((size_t)n != rtm->rtm_msglen) 1127 errx(1, "n=%zu, rtm_msglen=%u", (size_t)n, rtm->rtm_msglen); 1128 1129 handle_rtmsg(rtm); 1130 } 1131 1132 /* 1133 * execute and SIOCAIFADDR 1134 */ 1135 static int 1136 siocaifaddr(char *ifname, struct in_addr addr, struct in_addr mask, 1137 struct in_addr bcast) 1138 { 1139 struct ifaliasreq addreq; 1140 struct sockaddr_in *sa; 1141 1142 memset(&addreq, 0, sizeof(addreq)); 1143 strncpy(addreq.ifra_name, ifname, sizeof(addreq.ifra_name)); 1144 1145 sa = (struct sockaddr_in *)(void *)&addreq.ifra_addr; 1146 sa->sin_family = AF_INET; 1147 sa->sin_len = sizeof(*sa); 1148 sa->sin_addr = addr; 1149 1150 sa = (struct sockaddr_in *)(void *)&addreq.ifra_mask; 1151 sa->sin_family = AF_INET; 1152 sa->sin_len = sizeof(*sa); 1153 sa->sin_addr = mask; 1154 1155 sa = (struct sockaddr_in *)(void *)&addreq.ifra_broadaddr; 1156 sa->sin_family = AF_INET; 1157 sa->sin_len = sizeof(*sa); 1158 sa->sin_addr = bcast; 1159 1160 return (ioctl(mib_netsock, SIOCAIFADDR, &addreq)); 1161 } 1162 1163 /* 1164 * Exececute a SIOCDIFADDR 1165 */ 1166 static int 1167 siocdifaddr(const char *ifname, struct in_addr addr) 1168 { 1169 struct ifreq delreq; 1170 struct sockaddr_in *sa; 1171 1172 memset(&delreq, 0, sizeof(delreq)); 1173 strncpy(delreq.ifr_name, ifname, sizeof(delreq.ifr_name)); 1174 sa = (struct sockaddr_in *)(void *)&delreq.ifr_addr; 1175 sa->sin_family = AF_INET; 1176 sa->sin_len = sizeof(*sa); 1177 sa->sin_addr = addr; 1178 1179 return (ioctl(mib_netsock, SIOCDIFADDR, &delreq)); 1180 } 1181 1182 /* 1183 * Verify an interface address without fetching the entire list 1184 */ 1185 static int 1186 verify_ifa(const char *name, struct mibifa *ifa) 1187 { 1188 struct ifreq req; 1189 struct sockaddr_in *sa; 1190 1191 memset(&req, 0, sizeof(req)); 1192 strncpy(req.ifr_name, name, sizeof(req.ifr_name)); 1193 sa = (struct sockaddr_in *)(void *)&req.ifr_addr; 1194 sa->sin_family = AF_INET; 1195 sa->sin_len = sizeof(*sa); 1196 sa->sin_addr = ifa->inaddr; 1197 1198 if (ioctl(mib_netsock, SIOCGIFADDR, &req) == -1) 1199 return (-1); 1200 if (ifa->inaddr.s_addr != sa->sin_addr.s_addr) { 1201 syslog(LOG_ERR, "%s: address mismatch", __func__); 1202 return (-1); 1203 } 1204 1205 if (ioctl(mib_netsock, SIOCGIFNETMASK, &req) == -1) 1206 return (-1); 1207 if (ifa->inmask.s_addr != sa->sin_addr.s_addr) { 1208 syslog(LOG_ERR, "%s: netmask mismatch", __func__); 1209 return (-1); 1210 } 1211 return (0); 1212 } 1213 1214 /* 1215 * Restore a deleted interface address. Don't wait for the routing socket 1216 * to update us. 1217 */ 1218 void 1219 mib_undestroy_ifa(struct mibifa *ifa) 1220 { 1221 struct mibif *ifp; 1222 1223 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) 1224 /* keep it destroyed */ 1225 return; 1226 1227 if (siocaifaddr(ifp->name, ifa->inaddr, ifa->inmask, ifa->inbcast)) 1228 /* keep it destroyed */ 1229 return; 1230 1231 ifa->flags &= ~MIBIFA_DESTROYED; 1232 } 1233 1234 /* 1235 * Destroy an interface address 1236 */ 1237 int 1238 mib_destroy_ifa(struct mibifa *ifa) 1239 { 1240 struct mibif *ifp; 1241 1242 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) { 1243 /* ups. */ 1244 mib_iflist_bad = 1; 1245 return (-1); 1246 } 1247 if (siocdifaddr(ifp->name, ifa->inaddr)) { 1248 /* ups. */ 1249 syslog(LOG_ERR, "SIOCDIFADDR: %m"); 1250 mib_iflist_bad = 1; 1251 return (-1); 1252 } 1253 ifa->flags |= MIBIFA_DESTROYED; 1254 return (0); 1255 } 1256 1257 /* 1258 * Rollback the modification of an address. Don't bother to wait for 1259 * the routing socket. 1260 */ 1261 void 1262 mib_unmodify_ifa(struct mibifa *ifa) 1263 { 1264 struct mibif *ifp; 1265 1266 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) { 1267 /* ups. */ 1268 mib_iflist_bad = 1; 1269 return; 1270 } 1271 1272 if (siocaifaddr(ifp->name, ifa->inaddr, ifa->inmask, ifa->inbcast)) { 1273 /* ups. */ 1274 mib_iflist_bad = 1; 1275 return; 1276 } 1277 } 1278 1279 /* 1280 * Modify an IFA. 1281 */ 1282 int 1283 mib_modify_ifa(struct mibifa *ifa) 1284 { 1285 struct mibif *ifp; 1286 1287 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) { 1288 /* ups. */ 1289 mib_iflist_bad = 1; 1290 return (-1); 1291 } 1292 1293 if (siocaifaddr(ifp->name, ifa->inaddr, ifa->inmask, ifa->inbcast)) { 1294 /* ups. */ 1295 mib_iflist_bad = 1; 1296 return (-1); 1297 } 1298 1299 if (verify_ifa(ifp->name, ifa)) { 1300 /* ups. */ 1301 mib_iflist_bad = 1; 1302 return (-1); 1303 } 1304 1305 return (0); 1306 } 1307 1308 /* 1309 * Destroy a freshly created interface address. Don't bother to wait for 1310 * the routing socket. 1311 */ 1312 void 1313 mib_uncreate_ifa(struct mibifa *ifa) 1314 { 1315 struct mibif *ifp; 1316 1317 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) { 1318 /* ups. */ 1319 mib_iflist_bad = 1; 1320 return; 1321 } 1322 if (siocdifaddr(ifp->name, ifa->inaddr)) { 1323 /* ups. */ 1324 mib_iflist_bad = 1; 1325 return; 1326 } 1327 1328 destroy_ifa(ifa); 1329 } 1330 1331 /* 1332 * Create a new ifa and verify it 1333 */ 1334 struct mibifa * 1335 mib_create_ifa(u_int ifindex, struct in_addr addr, struct in_addr mask, 1336 struct in_addr bcast) 1337 { 1338 struct mibif *ifp; 1339 struct mibifa *ifa; 1340 1341 if ((ifp = mib_find_if(ifindex)) == NULL) 1342 return (NULL); 1343 if ((ifa = alloc_ifa(ifindex, addr)) == NULL) 1344 return (NULL); 1345 ifa->inmask = mask; 1346 ifa->inbcast = bcast; 1347 1348 if (siocaifaddr(ifp->name, ifa->inaddr, ifa->inmask, ifa->inbcast)) { 1349 syslog(LOG_ERR, "%s: %m", __func__); 1350 destroy_ifa(ifa); 1351 return (NULL); 1352 } 1353 if (verify_ifa(ifp->name, ifa)) { 1354 destroy_ifa(ifa); 1355 return (NULL); 1356 } 1357 return (ifa); 1358 } 1359 1360 /* 1361 * Get all cloning interfaces and make them dynamic. 1362 * Hah! Whe should probably do this on a periodic basis (XXX). 1363 */ 1364 static void 1365 get_cloners(void) 1366 { 1367 struct if_clonereq req; 1368 char *buf, *cp; 1369 int i; 1370 1371 memset(&req, 0, sizeof(req)); 1372 if (ioctl(mib_netsock, SIOCIFGCLONERS, &req) == -1) { 1373 syslog(LOG_ERR, "get cloners: %m"); 1374 return; 1375 } 1376 if ((buf = malloc(req.ifcr_total * IFNAMSIZ)) == NULL) { 1377 syslog(LOG_ERR, "%m"); 1378 return; 1379 } 1380 req.ifcr_count = req.ifcr_total; 1381 req.ifcr_buffer = buf; 1382 if (ioctl(mib_netsock, SIOCIFGCLONERS, &req) == -1) { 1383 syslog(LOG_ERR, "get cloners: %m"); 1384 free(buf); 1385 return; 1386 } 1387 for (cp = buf, i = 0; i < req.ifcr_total; i++, cp += IFNAMSIZ) 1388 mib_if_set_dyn(cp); 1389 free(buf); 1390 } 1391 1392 /* 1393 * Idle function 1394 */ 1395 static void 1396 mibII_idle(void) 1397 { 1398 struct mibifa *ifa; 1399 1400 if (mib_iflist_bad) { 1401 TAILQ_FOREACH(ifa, &mibifa_list, link) 1402 ifa->flags &= ~MIBIFA_DESTROYED; 1403 1404 /* assume, that all cloning interfaces are dynamic */ 1405 get_cloners(); 1406 1407 mib_refresh_iflist(); 1408 update_ifa_info(); 1409 mib_arp_update(); 1410 mib_iflist_bad = 0; 1411 } 1412 if (update_arp) 1413 mib_arp_update(); 1414 } 1415 1416 1417 /* 1418 * Start the module 1419 */ 1420 static void 1421 mibII_start(void) 1422 { 1423 if ((route_fd = fd_select(route, route_input, NULL, module)) == NULL) { 1424 syslog(LOG_ERR, "fd_select(route): %m"); 1425 return; 1426 } 1427 mib_refresh_iflist(); 1428 update_ifa_info(); 1429 mib_arp_update(); 1430 mib_iftable_last_change = 0; 1431 mib_ifstack_last_change = 0; 1432 1433 ifmib_reg = or_register(&oid_ifMIB, 1434 "The MIB module to describe generic objects for network interface" 1435 " sub-layers.", module); 1436 1437 ipmib_reg = or_register(&oid_ipMIB, 1438 "The MIB module for managing IP and ICMP implementations, but " 1439 "excluding their management of IP routes.", module); 1440 1441 tcpmib_reg = or_register(&oid_tcpMIB, 1442 "The MIB module for managing TCP implementations.", module); 1443 1444 udpmib_reg = or_register(&oid_udpMIB, 1445 "The MIB module for managing UDP implementations.", module); 1446 1447 ipForward_reg = or_register(&oid_ipForward, 1448 "The MIB module for the display of CIDR multipath IP Routes.", 1449 module); 1450 } 1451 1452 /* 1453 * Initialize the module 1454 */ 1455 static int 1456 mibII_init(struct lmodule *mod, int argc __unused, char *argv[] __unused) 1457 { 1458 size_t len; 1459 1460 module = mod; 1461 1462 len = sizeof(clockinfo); 1463 if (sysctlbyname("kern.clockrate", &clockinfo, &len, NULL, 0) == -1) { 1464 syslog(LOG_ERR, "kern.clockrate: %m"); 1465 return (-1); 1466 } 1467 if (len != sizeof(clockinfo)) { 1468 syslog(LOG_ERR, "kern.clockrate: wrong size"); 1469 return (-1); 1470 } 1471 1472 if ((route = socket(PF_ROUTE, SOCK_RAW, AF_UNSPEC)) == -1) { 1473 syslog(LOG_ERR, "PF_ROUTE: %m"); 1474 return (-1); 1475 } 1476 (void)shutdown(route, SHUT_WR); 1477 1478 if ((mib_netsock = socket(PF_INET, SOCK_DGRAM, 0)) == -1) { 1479 syslog(LOG_ERR, "PF_INET: %m"); 1480 (void)close(route); 1481 return (-1); 1482 } 1483 (void)shutdown(mib_netsock, SHUT_RDWR); 1484 1485 /* assume, that all cloning interfaces are dynamic */ 1486 get_cloners(); 1487 1488 return (0); 1489 } 1490 1491 static int 1492 mibII_fini(void) 1493 { 1494 if (route_fd != NULL) 1495 fd_deselect(route_fd); 1496 if (route != -1) 1497 (void)close(route); 1498 if (mib_netsock != -1) 1499 (void)close(mib_netsock); 1500 /* XXX free memory */ 1501 1502 or_unregister(ipForward_reg); 1503 or_unregister(udpmib_reg); 1504 or_unregister(tcpmib_reg); 1505 or_unregister(ipmib_reg); 1506 or_unregister(ifmib_reg); 1507 1508 return (0); 1509 } 1510 1511 static void 1512 mibII_loading(const struct lmodule *mod, int loaded) 1513 { 1514 struct mibif *ifp; 1515 1516 if (loaded == 1) 1517 return; 1518 1519 TAILQ_FOREACH(ifp, &mibif_list, link) 1520 if (ifp->xnotify_mod == mod) { 1521 ifp->xnotify_mod = NULL; 1522 ifp->xnotify_data = NULL; 1523 ifp->xnotify = NULL; 1524 } 1525 1526 mib_unregister_newif(mod); 1527 } 1528 1529 const struct snmp_module config = { 1530 "This module implements the interface and ip groups.", 1531 mibII_init, 1532 mibII_fini, 1533 mibII_idle, /* idle */ 1534 NULL, /* dump */ 1535 NULL, /* config */ 1536 mibII_start, 1537 NULL, 1538 mibII_ctree, 1539 mibII_CTREE_SIZE, 1540 mibII_loading 1541 }; 1542 1543 /* 1544 * Should have a list of these attached to each interface. 1545 */ 1546 void * 1547 mibif_notify(struct mibif *ifp, const struct lmodule *mod, 1548 mibif_notify_f func, void *data) 1549 { 1550 ifp->xnotify = func; 1551 ifp->xnotify_data = data; 1552 ifp->xnotify_mod = mod; 1553 1554 return (ifp); 1555 } 1556 1557 void 1558 mibif_unnotify(void *arg) 1559 { 1560 struct mibif *ifp = arg; 1561 1562 ifp->xnotify = NULL; 1563 ifp->xnotify_data = NULL; 1564 ifp->xnotify_mod = NULL; 1565 } 1566