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: mibII.c 516 2006-10-27 15:54:02Z brandt_h $ 30 * 31 * Implementation of the standard interfaces and ip MIB. 32 */ 33#include "mibII.h" 34#include "mibII_oid.h" 35#include <net/if.h> 36#include <net/if_types.h> 37 38 39/*****************************/ 40 41/* our module */ 42static struct lmodule *module; 43 44/* routing socket */ 45static int route; 46static void *route_fd; 47 48/* if-index allocator */ 49static uint32_t next_if_index = 1; 50 51/* currently fetching the arp table */ 52static int in_update_arp; 53 54/* OR registrations */ 55static u_int ifmib_reg; 56static u_int ipmib_reg; 57static u_int tcpmib_reg; 58static u_int udpmib_reg; 59static u_int ipForward_reg; 60 61/*****************************/ 62 63/* list of all IP addresses */ 64struct mibifa_list mibifa_list = TAILQ_HEAD_INITIALIZER(mibifa_list); 65 66/* list of all interfaces */ 67struct mibif_list mibif_list = TAILQ_HEAD_INITIALIZER(mibif_list); 68 69/* list of dynamic interface names */ 70struct mibdynif_list mibdynif_list = SLIST_HEAD_INITIALIZER(mibdynif_list); 71 72/* list of all interface index mappings */ 73struct mibindexmap_list mibindexmap_list = STAILQ_HEAD_INITIALIZER(mibindexmap_list); 74 75/* list of all stacking entries */ 76struct mibifstack_list mibifstack_list = TAILQ_HEAD_INITIALIZER(mibifstack_list); 77 78/* list of all receive addresses */ 79struct mibrcvaddr_list mibrcvaddr_list = TAILQ_HEAD_INITIALIZER(mibrcvaddr_list); 80 81/* list of all NetToMedia entries */ 82struct mibarp_list mibarp_list = TAILQ_HEAD_INITIALIZER(mibarp_list); 83 84/* number of interfaces */ 85int32_t mib_if_number; 86 87/* last change of table */ 88uint64_t mib_iftable_last_change; 89 90/* last change of stack table */ 91uint64_t mib_ifstack_last_change; 92 93/* if this is set, one of our lists may be bad. refresh them when idle */ 94int mib_iflist_bad; 95 96/* network socket */ 97int mib_netsock; 98 99/* last time refreshed */ 100uint64_t mibarpticks; 101 102/* info on system clocks */ 103struct clockinfo clockinfo; 104 105/* list of all New if registrations */ 106static struct newifreg_list newifreg_list = TAILQ_HEAD_INITIALIZER(newifreg_list); 107 108/* baud rate of fastest interface */ 109uint64_t mibif_maxspeed; 110 111/* user-forced update interval */ 112u_int mibif_force_hc_update_interval; 113 114/* current update interval */ 115u_int mibif_hc_update_interval; 116 117/* HC update timer handle */ 118static void *hc_update_timer; 119 120/* Idle poll timer */ 121static void *mibII_poll_timer; 122 123/* interfaces' data poll interval */ 124u_int mibII_poll_ticks; 125 126/* Idle poll hook */ 127static void mibII_idle(void *arg __unused); 128 129/*****************************/ 130 131static const struct asn_oid oid_ifMIB = OIDX_ifMIB; 132static const struct asn_oid oid_ipMIB = OIDX_ipMIB; 133static const struct asn_oid oid_tcpMIB = OIDX_tcpMIB; 134static const struct asn_oid oid_udpMIB = OIDX_udpMIB; 135static const struct asn_oid oid_ipForward = OIDX_ipForward; 136static const struct asn_oid oid_linkDown = OIDX_linkDown; 137static const struct asn_oid oid_linkUp = OIDX_linkUp; 138static const struct asn_oid oid_ifIndex = OIDX_ifIndex; 139 140/*****************************/ 141 142/* 143 * Find an interface 144 */ 145struct mibif * 146mib_find_if(u_int idx) 147{ 148 struct mibif *ifp; 149 150 TAILQ_FOREACH(ifp, &mibif_list, link) 151 if (ifp->index == idx) 152 return (ifp); 153 return (NULL); 154} 155 156struct mibif * 157mib_find_if_sys(u_int sysindex) 158{ 159 struct mibif *ifp; 160 161 TAILQ_FOREACH(ifp, &mibif_list, link) 162 if (ifp->sysindex == sysindex) 163 return (ifp); 164 return (NULL); 165} 166 167struct mibif * 168mib_find_if_name(const char *name) 169{ 170 struct mibif *ifp; 171 172 TAILQ_FOREACH(ifp, &mibif_list, link) 173 if (strcmp(ifp->name, name) == 0) 174 return (ifp); 175 return (NULL); 176} 177 178/* 179 * Check whether an interface is dynamic. The argument may include the 180 * unit number. This assumes, that the name part does NOT contain digits. 181 */ 182int 183mib_if_is_dyn(const char *name) 184{ 185 size_t len; 186 struct mibdynif *d; 187 188 for (len = 0; name[len] != '\0' && isalpha(name[len]) ; len++) 189 ; 190 SLIST_FOREACH(d, &mibdynif_list, link) 191 if (strlen(d->name) == len && strncmp(d->name, name, len) == 0) 192 return (1); 193 return (0); 194} 195 196/* set an interface name to dynamic mode */ 197void 198mib_if_set_dyn(const char *name) 199{ 200 struct mibdynif *d; 201 202 SLIST_FOREACH(d, &mibdynif_list, link) 203 if (strcmp(name, d->name) == 0) 204 return; 205 if ((d = malloc(sizeof(*d))) == NULL) 206 err(1, NULL); 207 strcpy(d->name, name); 208 SLIST_INSERT_HEAD(&mibdynif_list, d, link); 209} 210 211/* 212 * register for interface creations 213 */ 214int 215mib_register_newif(int (*func)(struct mibif *), const struct lmodule *mod) 216{ 217 struct newifreg *reg; 218 219 TAILQ_FOREACH(reg, &newifreg_list, link) 220 if (reg->mod == mod) { 221 reg->func = func; 222 return (0); 223 } 224 if ((reg = malloc(sizeof(*reg))) == NULL) { 225 syslog(LOG_ERR, "newifreg: %m"); 226 return (-1); 227 } 228 reg->mod = mod; 229 reg->func = func; 230 TAILQ_INSERT_TAIL(&newifreg_list, reg, link); 231 232 return (0); 233} 234 235void 236mib_unregister_newif(const struct lmodule *mod) 237{ 238 struct newifreg *reg; 239 240 TAILQ_FOREACH(reg, &newifreg_list, link) 241 if (reg->mod == mod) { 242 TAILQ_REMOVE(&newifreg_list, reg, link); 243 free(reg); 244 return; 245 } 246 247} 248 249struct mibif * 250mib_first_if(void) 251{ 252 return (TAILQ_FIRST(&mibif_list)); 253} 254struct mibif * 255mib_next_if(const struct mibif *ifp) 256{ 257 return (TAILQ_NEXT(ifp, link)); 258} 259 260/* 261 * Change the admin status of an interface 262 */ 263int 264mib_if_admin(struct mibif *ifp, int up) 265{ 266 struct ifreq ifr; 267 268 strncpy(ifr.ifr_name, ifp->name, sizeof(ifr.ifr_name)); 269 if (ioctl(mib_netsock, SIOCGIFFLAGS, &ifr) == -1) { 270 syslog(LOG_ERR, "SIOCGIFFLAGS(%s): %m", ifp->name); 271 return (-1); 272 } 273 if (up) 274 ifr.ifr_flags |= IFF_UP; 275 else 276 ifr.ifr_flags &= ~IFF_UP; 277 if (ioctl(mib_netsock, SIOCSIFFLAGS, &ifr) == -1) { 278 syslog(LOG_ERR, "SIOCSIFFLAGS(%s): %m", ifp->name); 279 return (-1); 280 } 281 282 (void)mib_fetch_ifmib(ifp); 283 284 return (0); 285} 286 287/* 288 * Generate a link up/down trap 289 */ 290static void 291link_trap(struct mibif *ifp, int up) 292{ 293 struct snmp_value ifindex; 294 295 ifindex.var = oid_ifIndex; 296 ifindex.var.subs[ifindex.var.len++] = ifp->index; 297 ifindex.syntax = SNMP_SYNTAX_INTEGER; 298 ifindex.v.integer = ifp->index; 299 300 snmp_send_trap(up ? &oid_linkUp : &oid_linkDown, &ifindex, 301 (struct snmp_value *)NULL); 302} 303 304/** 305 * Fetch the GENERIC IFMIB and update the HC counters 306 */ 307static int 308fetch_generic_mib(struct mibif *ifp, const struct ifmibdata *old) 309{ 310 int name[6]; 311 size_t len; 312 struct mibif_private *p = ifp->private; 313 314 name[0] = CTL_NET; 315 name[1] = PF_LINK; 316 name[2] = NETLINK_GENERIC; 317 name[3] = IFMIB_IFDATA; 318 name[4] = ifp->sysindex; 319 name[5] = IFDATA_GENERAL; 320 321 len = sizeof(ifp->mib); 322 if (sysctl(name, 6, &ifp->mib, &len, NULL, 0) == -1) { 323 if (errno != ENOENT) 324 syslog(LOG_WARNING, "sysctl(ifmib, %s) failed %m", 325 ifp->name); 326 return (-1); 327 } 328 329 /* 330 * Assume that one of the two following compounds is optimized away 331 */ 332 if (ULONG_MAX >= 0xffffffffffffffffULL) { 333 p->hc_inoctets = ifp->mib.ifmd_data.ifi_ibytes; 334 p->hc_outoctets = ifp->mib.ifmd_data.ifi_obytes; 335 p->hc_omcasts = ifp->mib.ifmd_data.ifi_omcasts; 336 p->hc_opackets = ifp->mib.ifmd_data.ifi_opackets; 337 p->hc_imcasts = ifp->mib.ifmd_data.ifi_imcasts; 338 p->hc_ipackets = ifp->mib.ifmd_data.ifi_ipackets; 339 340 } else if (ULONG_MAX >= 0xffffffff) { 341 342#define UPDATE(HC, MIB) \ 343 if (old->ifmd_data.MIB > ifp->mib.ifmd_data.MIB) \ 344 p->HC += (0x100000000ULL + \ 345 ifp->mib.ifmd_data.MIB) - \ 346 old->ifmd_data.MIB; \ 347 else \ 348 p->HC += ifp->mib.ifmd_data.MIB - \ 349 old->ifmd_data.MIB; 350 351 UPDATE(hc_inoctets, ifi_ibytes) 352 UPDATE(hc_outoctets, ifi_obytes) 353 UPDATE(hc_omcasts, ifi_omcasts) 354 UPDATE(hc_opackets, ifi_opackets) 355 UPDATE(hc_imcasts, ifi_imcasts) 356 UPDATE(hc_ipackets, ifi_ipackets) 357 358#undef UPDATE 359 } else 360 abort(); 361 return (0); 362} 363 364/** 365 * Update the 64-bit interface counters 366 */ 367static void 368update_hc_counters(void *arg __unused) 369{ 370 struct mibif *ifp; 371 struct ifmibdata oldmib; 372 373 TAILQ_FOREACH(ifp, &mibif_list, link) { 374 oldmib = ifp->mib; 375 (void)fetch_generic_mib(ifp, &oldmib); 376 } 377} 378 379/** 380 * Recompute the poll timer for the HC counters 381 */ 382void 383mibif_reset_hc_timer(void) 384{ 385 u_int ticks; 386 387 if ((ticks = mibif_force_hc_update_interval) == 0) { 388 if (mibif_maxspeed <= IF_Mbps(10)) { 389 /* at 10Mbps overflow needs 3436 seconds */ 390 ticks = 3000 * 100; /* 50 minutes */ 391 } else if (mibif_maxspeed <= IF_Mbps(100)) { 392 /* at 100Mbps overflow needs 343 seconds */ 393 ticks = 300 * 100; /* 5 minutes */ 394 } else if (mibif_maxspeed < IF_Mbps(622)) { 395 /* at 622Mbps overflow needs 53 seconds */ 396 ticks = 40 * 100; /* 40 seconds */ 397 } else if (mibif_maxspeed <= IF_Mbps(1000)) { 398 /* at 1Gbps overflow needs 34 seconds */ 399 ticks = 20 * 100; /* 20 seconds */ 400 } else { 401 /* at 10Gbps overflow needs 3.4 seconds */ 402 ticks = 100; /* 1 seconds */ 403 } 404 } 405 406 if (ticks == mibif_hc_update_interval) 407 return; 408 409 if (hc_update_timer != NULL) { 410 timer_stop(hc_update_timer); 411 hc_update_timer = NULL; 412 } 413 update_hc_counters(NULL); 414 if ((hc_update_timer = timer_start_repeat(ticks * 10, ticks * 10, 415 update_hc_counters, NULL, module)) == NULL) { 416 syslog(LOG_ERR, "timer_start(%u): %m", ticks); 417 return; 418 } 419 mibif_hc_update_interval = ticks; 420} 421 422/** 423 * Restart the idle poll timer. 424 */ 425void 426mibif_restart_mibII_poll_timer(void) 427{ 428 if (mibII_poll_timer != NULL) 429 timer_stop(mibII_poll_timer); 430 431 if ((mibII_poll_timer = timer_start_repeat(mibII_poll_ticks * 10, 432 mibII_poll_ticks * 10, mibII_idle, NULL, module)) == NULL) 433 syslog(LOG_ERR, "timer_start(%u): %m", mibII_poll_ticks); 434} 435 436/* 437 * Fetch new MIB data. 438 */ 439int 440mib_fetch_ifmib(struct mibif *ifp) 441{ 442 int name[6]; 443 size_t len; 444 void *newmib; 445 struct ifmibdata oldmib = ifp->mib; 446 447 if (fetch_generic_mib(ifp, &oldmib) == -1) 448 return (-1); 449 450 /* 451 * Quoting RFC2863, 3.1.15: "... LinkUp and linkDown traps are 452 * generated just after ifOperStatus leaves, or just before it 453 * enters, the down state, respectively;" 454 */ 455 if (ifp->trap_enable && ifp->mib.ifmd_data.ifi_link_state != 456 oldmib.ifmd_data.ifi_link_state && 457 (ifp->mib.ifmd_data.ifi_link_state == LINK_STATE_DOWN || 458 oldmib.ifmd_data.ifi_link_state == LINK_STATE_DOWN)) 459 link_trap(ifp, ifp->mib.ifmd_data.ifi_link_state == 460 LINK_STATE_UP ? 1 : 0); 461 462 ifp->flags &= ~(MIBIF_HIGHSPEED | MIBIF_VERYHIGHSPEED); 463 if (ifp->mib.ifmd_data.ifi_baudrate > 20000000) { 464 ifp->flags |= MIBIF_HIGHSPEED; 465 if (ifp->mib.ifmd_data.ifi_baudrate > 650000000) 466 ifp->flags |= MIBIF_VERYHIGHSPEED; 467 } 468 if (ifp->mib.ifmd_data.ifi_baudrate > mibif_maxspeed) { 469 mibif_maxspeed = ifp->mib.ifmd_data.ifi_baudrate; 470 mibif_reset_hc_timer(); 471 } 472 473 /* 474 * linkspecific MIB 475 */ 476 name[0] = CTL_NET; 477 name[1] = PF_LINK; 478 name[2] = NETLINK_GENERIC; 479 name[3] = IFMIB_IFDATA; 480 name[4] = ifp->sysindex; 481 name[5] = IFDATA_LINKSPECIFIC; 482 if (sysctl(name, 6, NULL, &len, NULL, 0) == -1) { 483 syslog(LOG_WARNING, "sysctl linkmib estimate (%s): %m", 484 ifp->name); 485 if (ifp->specmib != NULL) { 486 ifp->specmib = NULL; 487 ifp->specmiblen = 0; 488 } 489 goto out; 490 } 491 if (len == 0) { 492 if (ifp->specmib != NULL) { 493 ifp->specmib = NULL; 494 ifp->specmiblen = 0; 495 } 496 goto out; 497 } 498 499 if (ifp->specmiblen != len) { 500 if ((newmib = realloc(ifp->specmib, len)) == NULL) { 501 ifp->specmib = NULL; 502 ifp->specmiblen = 0; 503 goto out; 504 } 505 ifp->specmib = newmib; 506 ifp->specmiblen = len; 507 } 508 if (sysctl(name, 6, ifp->specmib, &len, NULL, 0) == -1) { 509 syslog(LOG_WARNING, "sysctl linkmib (%s): %m", ifp->name); 510 if (ifp->specmib != NULL) { 511 ifp->specmib = NULL; 512 ifp->specmiblen = 0; 513 } 514 } 515 516 out: 517 ifp->mibtick = get_ticks(); 518 return (0); 519} 520 521/* find first/next address for a given interface */ 522struct mibifa * 523mib_first_ififa(const struct mibif *ifp) 524{ 525 struct mibifa *ifa; 526 527 TAILQ_FOREACH(ifa, &mibifa_list, link) 528 if (ifp->index == ifa->ifindex) 529 return (ifa); 530 return (NULL); 531} 532 533struct mibifa * 534mib_next_ififa(struct mibifa *ifa0) 535{ 536 struct mibifa *ifa; 537 538 ifa = ifa0; 539 while ((ifa = TAILQ_NEXT(ifa, link)) != NULL) 540 if (ifa->ifindex == ifa0->ifindex) 541 return (ifa); 542 return (NULL); 543} 544 545/* 546 * Allocate a new IFA 547 */ 548static struct mibifa * 549alloc_ifa(u_int ifindex, struct in_addr addr) 550{ 551 struct mibifa *ifa; 552 uint32_t ha; 553 554 if ((ifa = malloc(sizeof(struct mibifa))) == NULL) { 555 syslog(LOG_ERR, "ifa: %m"); 556 return (NULL); 557 } 558 ifa->inaddr = addr; 559 ifa->ifindex = ifindex; 560 561 ha = ntohl(ifa->inaddr.s_addr); 562 ifa->index.len = 4; 563 ifa->index.subs[0] = (ha >> 24) & 0xff; 564 ifa->index.subs[1] = (ha >> 16) & 0xff; 565 ifa->index.subs[2] = (ha >> 8) & 0xff; 566 ifa->index.subs[3] = (ha >> 0) & 0xff; 567 568 ifa->flags = 0; 569 ifa->inbcast.s_addr = 0; 570 ifa->inmask.s_addr = 0xffffffff; 571 572 INSERT_OBJECT_OID(ifa, &mibifa_list); 573 574 return (ifa); 575} 576 577/* 578 * Delete an interface address 579 */ 580static void 581destroy_ifa(struct mibifa *ifa) 582{ 583 TAILQ_REMOVE(&mibifa_list, ifa, link); 584 free(ifa); 585} 586 587 588/* 589 * Helper routine to extract the sockaddr structures from a routing 590 * socket message. 591 */ 592void 593mib_extract_addrs(int addrs, u_char *info, struct sockaddr **out) 594{ 595 u_int i; 596 597 for (i = 0; i < RTAX_MAX; i++) { 598 if ((addrs & (1 << i)) != 0) { 599 *out = (struct sockaddr *)(void *)info; 600 info += roundup((*out)->sa_len, sizeof(long)); 601 } else 602 *out = NULL; 603 out++; 604 } 605} 606 607/* 608 * save the phys address of an interface. Handle receive address entries here. 609 */ 610static void 611get_physaddr(struct mibif *ifp, struct sockaddr_dl *sdl, u_char *ptr) 612{ 613 u_char *np; 614 struct mibrcvaddr *rcv; 615 616 if (sdl->sdl_alen == 0) { 617 /* no address */ 618 if (ifp->physaddrlen != 0) { 619 if ((rcv = mib_find_rcvaddr(ifp->index, ifp->physaddr, 620 ifp->physaddrlen)) != NULL) 621 mib_rcvaddr_delete(rcv); 622 free(ifp->physaddr); 623 ifp->physaddr = NULL; 624 ifp->physaddrlen = 0; 625 } 626 return; 627 } 628 629 if (ifp->physaddrlen != sdl->sdl_alen) { 630 /* length changed */ 631 if (ifp->physaddrlen) { 632 /* delete olf receive address */ 633 if ((rcv = mib_find_rcvaddr(ifp->index, ifp->physaddr, 634 ifp->physaddrlen)) != NULL) 635 mib_rcvaddr_delete(rcv); 636 } 637 if ((np = realloc(ifp->physaddr, sdl->sdl_alen)) == NULL) { 638 free(ifp->physaddr); 639 ifp->physaddr = NULL; 640 ifp->physaddrlen = 0; 641 return; 642 } 643 ifp->physaddr = np; 644 ifp->physaddrlen = sdl->sdl_alen; 645 646 } else if (memcmp(ifp->physaddr, ptr, ifp->physaddrlen) == 0) { 647 /* no change */ 648 return; 649 650 } else { 651 /* address changed */ 652 653 /* delete olf receive address */ 654 if ((rcv = mib_find_rcvaddr(ifp->index, ifp->physaddr, 655 ifp->physaddrlen)) != NULL) 656 mib_rcvaddr_delete(rcv); 657 } 658 659 memcpy(ifp->physaddr, ptr, ifp->physaddrlen); 660 661 /* make new receive address */ 662 if ((rcv = mib_rcvaddr_create(ifp, ifp->physaddr, ifp->physaddrlen)) != NULL) 663 rcv->flags |= MIBRCVADDR_HW; 664} 665 666/* 667 * Free an interface 668 */ 669static void 670mibif_free(struct mibif *ifp) 671{ 672 struct mibif *ifp1; 673 struct mibindexmap *map; 674 struct mibifa *ifa, *ifa1; 675 struct mibrcvaddr *rcv, *rcv1; 676 struct mibarp *at, *at1; 677 678 if (ifp->xnotify != NULL) 679 (*ifp->xnotify)(ifp, MIBIF_NOTIFY_DESTROY, ifp->xnotify_data); 680 681 (void)mib_ifstack_delete(ifp, NULL); 682 (void)mib_ifstack_delete(NULL, ifp); 683 684 TAILQ_REMOVE(&mibif_list, ifp, link); 685 686 /* if this was the fastest interface - recompute this */ 687 if (ifp->mib.ifmd_data.ifi_baudrate == mibif_maxspeed) { 688 mibif_maxspeed = ifp->mib.ifmd_data.ifi_baudrate; 689 TAILQ_FOREACH(ifp1, &mibif_list, link) 690 if (ifp1->mib.ifmd_data.ifi_baudrate > mibif_maxspeed) 691 mibif_maxspeed = 692 ifp1->mib.ifmd_data.ifi_baudrate; 693 mibif_reset_hc_timer(); 694 } 695 696 free(ifp->private); 697 if (ifp->physaddr != NULL) 698 free(ifp->physaddr); 699 if (ifp->specmib != NULL) 700 free(ifp->specmib); 701 702 STAILQ_FOREACH(map, &mibindexmap_list, link) 703 if (map->mibif == ifp) { 704 map->mibif = NULL; 705 break; 706 } 707 708 /* purge interface addresses */ 709 ifa = TAILQ_FIRST(&mibifa_list); 710 while (ifa != NULL) { 711 ifa1 = TAILQ_NEXT(ifa, link); 712 if (ifa->ifindex == ifp->index) 713 destroy_ifa(ifa); 714 ifa = ifa1; 715 } 716 717 /* purge receive addresses */ 718 rcv = TAILQ_FIRST(&mibrcvaddr_list); 719 while (rcv != NULL) { 720 rcv1 = TAILQ_NEXT(rcv, link); 721 if (rcv->ifindex == ifp->index) 722 mib_rcvaddr_delete(rcv); 723 rcv = rcv1; 724 } 725 726 /* purge ARP entries */ 727 at = TAILQ_FIRST(&mibarp_list); 728 while (at != NULL) { 729 at1 = TAILQ_NEXT(at, link); 730 if (at->index.subs[0] == ifp->index) 731 mib_arp_delete(at); 732 at = at1; 733 } 734 735 736 free(ifp); 737 mib_if_number--; 738 mib_iftable_last_change = this_tick; 739} 740 741/* 742 * Create a new interface 743 */ 744static struct mibif * 745mibif_create(u_int sysindex, const char *name) 746{ 747 struct mibif *ifp; 748 struct mibindexmap *map; 749 750 if ((ifp = malloc(sizeof(*ifp))) == NULL) { 751 syslog(LOG_WARNING, "%s: %m", __func__); 752 return (NULL); 753 } 754 memset(ifp, 0, sizeof(*ifp)); 755 if ((ifp->private = malloc(sizeof(struct mibif_private))) == NULL) { 756 syslog(LOG_WARNING, "%s: %m", __func__); 757 free(ifp); 758 return (NULL); 759 } 760 memset(ifp->private, 0, sizeof(struct mibif_private)); 761 762 ifp->sysindex = sysindex; 763 strcpy(ifp->name, name); 764 strcpy(ifp->descr, name); 765 ifp->spec_oid = oid_zeroDotZero; 766 767 map = NULL; 768 if (!mib_if_is_dyn(ifp->name)) { 769 /* non-dynamic. look whether we know the interface */ 770 STAILQ_FOREACH(map, &mibindexmap_list, link) 771 if (strcmp(map->name, ifp->name) == 0) { 772 ifp->index = map->ifindex; 773 map->mibif = ifp; 774 break; 775 } 776 /* assume it has a connector if it is not dynamic */ 777 ifp->has_connector = 1; 778 ifp->trap_enable = 1; 779 } 780 if (map == NULL) { 781 /* new interface - get new index */ 782 if (next_if_index > 0x7fffffff) 783 errx(1, "ifindex wrap"); 784 785 if ((map = malloc(sizeof(*map))) == NULL) { 786 syslog(LOG_ERR, "ifmap: %m"); 787 free(ifp); 788 return (NULL); 789 } 790 map->ifindex = next_if_index++; 791 map->sysindex = ifp->sysindex; 792 strcpy(map->name, ifp->name); 793 map->mibif = ifp; 794 STAILQ_INSERT_TAIL(&mibindexmap_list, map, link); 795 } else { 796 /* re-instantiate. Introduce a counter discontinuity */ 797 ifp->counter_disc = get_ticks(); 798 } 799 ifp->index = map->ifindex; 800 ifp->mib.ifmd_data.ifi_link_state = LINK_STATE_UNKNOWN; 801 802 INSERT_OBJECT_INT(ifp, &mibif_list); 803 mib_if_number++; 804 mib_iftable_last_change = this_tick; 805 806 /* instantiate default ifStack entries */ 807 (void)mib_ifstack_create(ifp, NULL); 808 (void)mib_ifstack_create(NULL, ifp); 809 810 return (ifp); 811} 812 813/* 814 * Inform all interested parties about a new interface 815 */ 816static void 817notify_newif(struct mibif *ifp) 818{ 819 struct newifreg *reg; 820 821 TAILQ_FOREACH(reg, &newifreg_list, link) 822 if ((*reg->func)(ifp)) 823 return; 824} 825 826/* 827 * This is called for new interfaces after we have fetched the interface 828 * MIB. If this is a broadcast interface try to guess the broadcast address 829 * depending on the interface type. 830 */ 831static void 832check_llbcast(struct mibif *ifp) 833{ 834 static u_char ether_bcast[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 835 static u_char arcnet_bcast = 0; 836 struct mibrcvaddr *rcv; 837 838 if (!(ifp->mib.ifmd_flags & IFF_BROADCAST)) 839 return; 840 841 switch (ifp->mib.ifmd_data.ifi_type) { 842 843 case IFT_ETHER: 844 case IFT_FDDI: 845 case IFT_ISO88025: 846 case IFT_L2VLAN: 847 if (mib_find_rcvaddr(ifp->index, ether_bcast, 6) == NULL && 848 (rcv = mib_rcvaddr_create(ifp, ether_bcast, 6)) != NULL) 849 rcv->flags |= MIBRCVADDR_BCAST; 850 break; 851 852 case IFT_ARCNET: 853 if (mib_find_rcvaddr(ifp->index, &arcnet_bcast, 1) == NULL && 854 (rcv = mib_rcvaddr_create(ifp, &arcnet_bcast, 1)) != NULL) 855 rcv->flags |= MIBRCVADDR_BCAST; 856 break; 857 } 858} 859 860 861/* 862 * Retrieve the current interface list from the system. 863 */ 864void 865mib_refresh_iflist(void) 866{ 867 struct mibif *ifp, *ifp1; 868 size_t len; 869 u_short idx; 870 int name[6]; 871 int count; 872 struct ifmibdata mib; 873 874 TAILQ_FOREACH(ifp, &mibif_list, link) 875 ifp->flags &= ~MIBIF_FOUND; 876 877 len = sizeof(count); 878 if (sysctlbyname("net.link.generic.system.ifcount", &count, &len, 879 NULL, 0) == -1) { 880 syslog(LOG_ERR, "ifcount: %m"); 881 return; 882 } 883 name[0] = CTL_NET; 884 name[1] = PF_LINK; 885 name[2] = NETLINK_GENERIC; 886 name[3] = IFMIB_IFDATA; 887 name[5] = IFDATA_GENERAL; 888 for (idx = 1; idx <= count; idx++) { 889 name[4] = idx; 890 len = sizeof(mib); 891 if (sysctl(name, 6, &mib, &len, NULL, 0) == -1) { 892 if (errno == ENOENT) 893 continue; 894 syslog(LOG_ERR, "ifmib(%u): %m", idx); 895 return; 896 } 897 if ((ifp = mib_find_if_sys(idx)) != NULL) { 898 ifp->flags |= MIBIF_FOUND; 899 continue; 900 } 901 /* Unknown interface - create */ 902 if ((ifp = mibif_create(idx, mib.ifmd_name)) != NULL) { 903 ifp->flags |= MIBIF_FOUND; 904 (void)mib_fetch_ifmib(ifp); 905 check_llbcast(ifp); 906 notify_newif(ifp); 907 } 908 } 909 910 /* 911 * Purge interfaces that disappeared 912 */ 913 ifp = TAILQ_FIRST(&mibif_list); 914 while (ifp != NULL) { 915 ifp1 = TAILQ_NEXT(ifp, link); 916 if (!(ifp->flags & MIBIF_FOUND)) 917 mibif_free(ifp); 918 ifp = ifp1; 919 } 920} 921 922/* 923 * Find an interface address 924 */ 925struct mibifa * 926mib_find_ifa(struct in_addr addr) 927{ 928 struct mibifa *ifa; 929 930 TAILQ_FOREACH(ifa, &mibifa_list, link) 931 if (ifa->inaddr.s_addr == addr.s_addr) 932 return (ifa); 933 return (NULL); 934} 935 936/* 937 * Process a new ARP entry 938 */ 939static void 940process_arp(const struct rt_msghdr *rtm, const struct sockaddr_dl *sdl, 941 const struct sockaddr_in *sa) 942{ 943 struct mibif *ifp; 944 struct mibarp *at; 945 946 /* IP arp table entry */ 947 if (sdl->sdl_alen == 0) 948 return; 949 if ((ifp = mib_find_if_sys(sdl->sdl_index)) == NULL) 950 return; 951 /* have a valid entry */ 952 if ((at = mib_find_arp(ifp, sa->sin_addr)) == NULL && 953 (at = mib_arp_create(ifp, sa->sin_addr, 954 sdl->sdl_data + sdl->sdl_nlen, sdl->sdl_alen)) == NULL) 955 return; 956 957 if (rtm->rtm_rmx.rmx_expire == 0) 958 at->flags |= MIBARP_PERM; 959 else 960 at->flags &= ~MIBARP_PERM; 961 at->flags |= MIBARP_FOUND; 962} 963 964/* 965 * Handle a routing socket message. 966 */ 967static void 968handle_rtmsg(struct rt_msghdr *rtm) 969{ 970 struct sockaddr *addrs[RTAX_MAX]; 971 struct if_msghdr *ifm; 972 struct ifa_msghdr *ifam; 973 struct ifma_msghdr *ifmam; 974#ifdef RTM_IFANNOUNCE 975 struct if_announcemsghdr *ifan; 976#endif 977 struct mibif *ifp; 978 struct sockaddr_dl *sdl; 979 struct sockaddr_in *sa; 980 struct mibifa *ifa; 981 struct mibrcvaddr *rcv; 982 u_char *ptr; 983 984 if (rtm->rtm_version != RTM_VERSION) { 985 syslog(LOG_ERR, "Bogus RTM version %u", rtm->rtm_version); 986 return; 987 } 988 989 switch (rtm->rtm_type) { 990 991 case RTM_NEWADDR: 992 ifam = (struct ifa_msghdr *)rtm; 993 mib_extract_addrs(ifam->ifam_addrs, (u_char *)(ifam + 1), addrs); 994 if (addrs[RTAX_IFA] == NULL || addrs[RTAX_NETMASK] == NULL) 995 break; 996 997 sa = (struct sockaddr_in *)(void *)addrs[RTAX_IFA]; 998 if ((ifa = mib_find_ifa(sa->sin_addr)) == NULL) { 999 /* unknown address */ 1000 if ((ifp = mib_find_if_sys(ifam->ifam_index)) == NULL) { 1001 syslog(LOG_WARNING, "RTM_NEWADDR for unknown " 1002 "interface %u", ifam->ifam_index); 1003 break; 1004 } 1005 if ((ifa = alloc_ifa(ifp->index, sa->sin_addr)) == NULL) 1006 break; 1007 } 1008 sa = (struct sockaddr_in *)(void *)addrs[RTAX_NETMASK]; 1009 ifa->inmask = sa->sin_addr; 1010 1011 if (addrs[RTAX_BRD] != NULL) { 1012 sa = (struct sockaddr_in *)(void *)addrs[RTAX_BRD]; 1013 ifa->inbcast = sa->sin_addr; 1014 } 1015 ifa->flags |= MIBIFA_FOUND; 1016 break; 1017 1018 case RTM_DELADDR: 1019 ifam = (struct ifa_msghdr *)rtm; 1020 mib_extract_addrs(ifam->ifam_addrs, (u_char *)(ifam + 1), addrs); 1021 if (addrs[RTAX_IFA] == NULL) 1022 break; 1023 1024 sa = (struct sockaddr_in *)(void *)addrs[RTAX_IFA]; 1025 if ((ifa = mib_find_ifa(sa->sin_addr)) != NULL) { 1026 ifa->flags |= MIBIFA_FOUND; 1027 if (!(ifa->flags & MIBIFA_DESTROYED)) 1028 destroy_ifa(ifa); 1029 } 1030 break; 1031 1032 case RTM_NEWMADDR: 1033 ifmam = (struct ifma_msghdr *)rtm; 1034 mib_extract_addrs(ifmam->ifmam_addrs, (u_char *)(ifmam + 1), addrs); 1035 if (addrs[RTAX_IFA] == NULL || 1036 addrs[RTAX_IFA]->sa_family != AF_LINK) 1037 break; 1038 sdl = (struct sockaddr_dl *)(void *)addrs[RTAX_IFA]; 1039 if ((rcv = mib_find_rcvaddr(sdl->sdl_index, 1040 sdl->sdl_data + sdl->sdl_nlen, sdl->sdl_alen)) == NULL) { 1041 /* unknown address */ 1042 if ((ifp = mib_find_if_sys(sdl->sdl_index)) == NULL) { 1043 syslog(LOG_WARNING, "RTM_NEWMADDR for unknown " 1044 "interface %u", sdl->sdl_index); 1045 break; 1046 } 1047 if ((rcv = mib_rcvaddr_create(ifp, 1048 sdl->sdl_data + sdl->sdl_nlen, sdl->sdl_alen)) == NULL) 1049 break; 1050 rcv->flags |= MIBRCVADDR_VOLATILE; 1051 } 1052 rcv->flags |= MIBRCVADDR_FOUND; 1053 break; 1054 1055 case RTM_DELMADDR: 1056 ifmam = (struct ifma_msghdr *)rtm; 1057 mib_extract_addrs(ifmam->ifmam_addrs, (u_char *)(ifmam + 1), addrs); 1058 if (addrs[RTAX_IFA] == NULL || 1059 addrs[RTAX_IFA]->sa_family != AF_LINK) 1060 break; 1061 sdl = (struct sockaddr_dl *)(void *)addrs[RTAX_IFA]; 1062 if ((rcv = mib_find_rcvaddr(sdl->sdl_index, 1063 sdl->sdl_data + sdl->sdl_nlen, sdl->sdl_alen)) != NULL) 1064 mib_rcvaddr_delete(rcv); 1065 break; 1066 1067 case RTM_IFINFO: 1068 ifm = (struct if_msghdr *)(void *)rtm; 1069 mib_extract_addrs(ifm->ifm_addrs, (u_char *)(ifm + 1), addrs); 1070 if ((ifp = mib_find_if_sys(ifm->ifm_index)) == NULL) 1071 break; 1072 if (addrs[RTAX_IFP] != NULL && 1073 addrs[RTAX_IFP]->sa_family == AF_LINK) { 1074 sdl = (struct sockaddr_dl *)(void *)addrs[RTAX_IFP]; 1075 ptr = sdl->sdl_data + sdl->sdl_nlen; 1076 get_physaddr(ifp, sdl, ptr); 1077 } 1078 (void)mib_fetch_ifmib(ifp); 1079 break; 1080 1081#ifdef RTM_IFANNOUNCE 1082 case RTM_IFANNOUNCE: 1083 ifan = (struct if_announcemsghdr *)rtm; 1084 ifp = mib_find_if_sys(ifan->ifan_index); 1085 1086 switch (ifan->ifan_what) { 1087 1088 case IFAN_ARRIVAL: 1089 if (ifp == NULL && (ifp = mibif_create(ifan->ifan_index, 1090 ifan->ifan_name)) != NULL) { 1091 (void)mib_fetch_ifmib(ifp); 1092 check_llbcast(ifp); 1093 notify_newif(ifp); 1094 } 1095 break; 1096 1097 case IFAN_DEPARTURE: 1098 if (ifp != NULL) 1099 mibif_free(ifp); 1100 break; 1101 } 1102 break; 1103#endif 1104 case RTM_GET: 1105 case RTM_ADD: 1106 mib_extract_addrs(rtm->rtm_addrs, (u_char *)(rtm + 1), addrs); 1107 if (rtm->rtm_flags & RTF_LLINFO) { 1108 if (addrs[RTAX_DST] == NULL || 1109 addrs[RTAX_GATEWAY] == NULL || 1110 addrs[RTAX_DST]->sa_family != AF_INET || 1111 addrs[RTAX_GATEWAY]->sa_family != AF_LINK) 1112 break; 1113 process_arp(rtm, 1114 (struct sockaddr_dl *)(void *)addrs[RTAX_GATEWAY], 1115 (struct sockaddr_in *)(void *)addrs[RTAX_DST]); 1116 } else { 1117 if (rtm->rtm_errno == 0 && (rtm->rtm_flags & RTF_UP)) 1118 mib_sroute_process(rtm, addrs[RTAX_GATEWAY], 1119 addrs[RTAX_DST], addrs[RTAX_NETMASK]); 1120 } 1121 break; 1122 1123 case RTM_DELETE: 1124 mib_extract_addrs(rtm->rtm_addrs, (u_char *)(rtm + 1), addrs); 1125 1126 if (rtm->rtm_errno == 0 && (rtm->rtm_flags & RTF_UP)) 1127 mib_sroute_process(rtm, addrs[RTAX_GATEWAY], 1128 addrs[RTAX_DST], addrs[RTAX_NETMASK]); 1129 break; 1130 } 1131} 1132 1133/* 1134 * send a routing message 1135 */ 1136void 1137mib_send_rtmsg(struct rt_msghdr *rtm, struct sockaddr *gw, 1138 struct sockaddr *dst, struct sockaddr *mask) 1139{ 1140 size_t len; 1141 struct rt_msghdr *msg; 1142 char *cp; 1143 ssize_t sent; 1144 1145 len = sizeof(*rtm) + SA_SIZE(gw) + SA_SIZE(dst) + SA_SIZE(mask); 1146 if ((msg = malloc(len)) == NULL) { 1147 syslog(LOG_ERR, "%s: %m", __func__); 1148 return; 1149 } 1150 cp = (char *)(msg + 1); 1151 1152 memset(msg, 0, sizeof(*msg)); 1153 msg->rtm_flags = 0; 1154 msg->rtm_version = RTM_VERSION; 1155 msg->rtm_addrs = RTA_DST | RTA_GATEWAY; 1156 1157 memcpy(cp, dst, SA_SIZE(dst)); 1158 cp += SA_SIZE(dst); 1159 memcpy(cp, gw, SA_SIZE(gw)); 1160 cp += SA_SIZE(gw); 1161 if (mask != NULL) { 1162 memcpy(cp, mask, SA_SIZE(mask)); 1163 cp += SA_SIZE(mask); 1164 msg->rtm_addrs |= RTA_NETMASK; 1165 } 1166 msg->rtm_msglen = cp - (char *)msg; 1167 msg->rtm_type = RTM_GET; 1168 if ((sent = write(route, msg, msg->rtm_msglen)) == -1) { 1169 syslog(LOG_ERR, "%s: write: %m", __func__); 1170 free(msg); 1171 return; 1172 } 1173 if (sent != msg->rtm_msglen) { 1174 syslog(LOG_ERR, "%s: short write", __func__); 1175 free(msg); 1176 return; 1177 } 1178 free(msg); 1179} 1180 1181/* 1182 * Fetch the routing table via sysctl 1183 */ 1184u_char * 1185mib_fetch_rtab(int af, int info, int arg, size_t *lenp) 1186{ 1187 int name[6]; 1188 u_char *buf, *newbuf; 1189 1190 name[0] = CTL_NET; 1191 name[1] = PF_ROUTE; 1192 name[2] = 0; 1193 name[3] = af; 1194 name[4] = info; 1195 name[5] = arg; 1196 1197 *lenp = 0; 1198 1199 /* initial estimate */ 1200 if (sysctl(name, 6, NULL, lenp, NULL, 0) == -1) { 1201 syslog(LOG_ERR, "sysctl estimate (%d,%d,%d,%d,%d,%d): %m", 1202 name[0], name[1], name[2], name[3], name[4], name[5]); 1203 return (NULL); 1204 } 1205 if (*lenp == 0) 1206 return (NULL); 1207 1208 buf = NULL; 1209 for (;;) { 1210 if ((newbuf = realloc(buf, *lenp)) == NULL) { 1211 syslog(LOG_ERR, "sysctl buffer: %m"); 1212 free(buf); 1213 return (NULL); 1214 } 1215 buf = newbuf; 1216 1217 if (sysctl(name, 6, buf, lenp, NULL, 0) == 0) 1218 break; 1219 1220 if (errno != ENOMEM) { 1221 syslog(LOG_ERR, "sysctl get: %m"); 1222 free(buf); 1223 return (NULL); 1224 } 1225 *lenp += *lenp / 8 + 1; 1226 } 1227 1228 return (buf); 1229} 1230 1231/* 1232 * Update the following info: interface, interface addresses, interface 1233 * receive addresses, arp-table. 1234 * This does not change the interface list itself. 1235 */ 1236static void 1237update_ifa_info(void) 1238{ 1239 u_char *buf, *next; 1240 struct rt_msghdr *rtm; 1241 struct mibifa *ifa, *ifa1; 1242 struct mibrcvaddr *rcv, *rcv1; 1243 size_t needed; 1244 static const int infos[][3] = { 1245 { 0, NET_RT_IFLIST, 0 }, 1246#ifdef NET_RT_IFMALIST 1247 { AF_LINK, NET_RT_IFMALIST, 0 }, 1248#endif 1249 }; 1250 u_int i; 1251 1252 TAILQ_FOREACH(ifa, &mibifa_list, link) 1253 ifa->flags &= ~MIBIFA_FOUND; 1254 TAILQ_FOREACH(rcv, &mibrcvaddr_list, link) 1255 rcv->flags &= ~MIBRCVADDR_FOUND; 1256 1257 for (i = 0; i < sizeof(infos) / sizeof(infos[0]); i++) { 1258 if ((buf = mib_fetch_rtab(infos[i][0], infos[i][1], infos[i][2], 1259 &needed)) == NULL) 1260 continue; 1261 1262 next = buf; 1263 while (next < buf + needed) { 1264 rtm = (struct rt_msghdr *)(void *)next; 1265 next += rtm->rtm_msglen; 1266 handle_rtmsg(rtm); 1267 } 1268 free(buf); 1269 } 1270 1271 /* 1272 * Purge the address list of unused entries. These may happen for 1273 * interface aliases that are on the same subnet. We don't receive 1274 * routing socket messages for them. 1275 */ 1276 ifa = TAILQ_FIRST(&mibifa_list); 1277 while (ifa != NULL) { 1278 ifa1 = TAILQ_NEXT(ifa, link); 1279 if (!(ifa->flags & MIBIFA_FOUND)) 1280 destroy_ifa(ifa); 1281 ifa = ifa1; 1282 } 1283 1284 rcv = TAILQ_FIRST(&mibrcvaddr_list); 1285 while (rcv != NULL) { 1286 rcv1 = TAILQ_NEXT(rcv, link); 1287 if (!(rcv->flags & (MIBRCVADDR_FOUND | MIBRCVADDR_BCAST | 1288 MIBRCVADDR_HW))) 1289 mib_rcvaddr_delete(rcv); 1290 rcv = rcv1; 1291 } 1292} 1293 1294/* 1295 * Update arp table 1296 * 1297*/ 1298void 1299mib_arp_update(void) 1300{ 1301 struct mibarp *at, *at1; 1302 size_t needed; 1303 u_char *buf, *next; 1304 struct rt_msghdr *rtm; 1305 1306 if (in_update_arp) 1307 return; /* Aaargh */ 1308 in_update_arp = 1; 1309 1310 TAILQ_FOREACH(at, &mibarp_list, link) 1311 at->flags &= ~MIBARP_FOUND; 1312 1313 if ((buf = mib_fetch_rtab(AF_INET, NET_RT_FLAGS, 0, &needed)) == NULL) { 1314 in_update_arp = 0; 1315 return; 1316 } 1317 1318 next = buf; 1319 while (next < buf + needed) { 1320 rtm = (struct rt_msghdr *)(void *)next; 1321 next += rtm->rtm_msglen; 1322 handle_rtmsg(rtm); 1323 } 1324 free(buf); 1325 1326 at = TAILQ_FIRST(&mibarp_list); 1327 while (at != NULL) { 1328 at1 = TAILQ_NEXT(at, link); 1329 if (!(at->flags & MIBARP_FOUND)) 1330 mib_arp_delete(at); 1331 at = at1; 1332 } 1333 mibarpticks = get_ticks(); 1334 in_update_arp = 0; 1335} 1336 1337 1338/* 1339 * Intput on the routing socket. 1340 */ 1341static void 1342route_input(int fd, void *udata __unused) 1343{ 1344 u_char buf[1024 * 16]; 1345 ssize_t n; 1346 struct rt_msghdr *rtm; 1347 1348 if ((n = read(fd, buf, sizeof(buf))) == -1) 1349 err(1, "read(rt_socket)"); 1350 1351 if (n == 0) 1352 errx(1, "EOF on rt_socket"); 1353 1354 rtm = (struct rt_msghdr *)(void *)buf; 1355 if ((size_t)n != rtm->rtm_msglen) 1356 errx(1, "n=%zu, rtm_msglen=%u", (size_t)n, rtm->rtm_msglen); 1357 1358 handle_rtmsg(rtm); 1359} 1360 1361/* 1362 * execute and SIOCAIFADDR 1363 */ 1364static int 1365siocaifaddr(char *ifname, struct in_addr addr, struct in_addr mask, 1366 struct in_addr bcast) 1367{ 1368 struct ifaliasreq addreq; 1369 struct sockaddr_in *sa; 1370 1371 memset(&addreq, 0, sizeof(addreq)); 1372 strncpy(addreq.ifra_name, ifname, sizeof(addreq.ifra_name)); 1373 1374 sa = (struct sockaddr_in *)(void *)&addreq.ifra_addr; 1375 sa->sin_family = AF_INET; 1376 sa->sin_len = sizeof(*sa); 1377 sa->sin_addr = addr; 1378 1379 sa = (struct sockaddr_in *)(void *)&addreq.ifra_mask; 1380 sa->sin_family = AF_INET; 1381 sa->sin_len = sizeof(*sa); 1382 sa->sin_addr = mask; 1383 1384 sa = (struct sockaddr_in *)(void *)&addreq.ifra_broadaddr; 1385 sa->sin_family = AF_INET; 1386 sa->sin_len = sizeof(*sa); 1387 sa->sin_addr = bcast; 1388 1389 return (ioctl(mib_netsock, SIOCAIFADDR, &addreq)); 1390} 1391 1392/* 1393 * Exececute a SIOCDIFADDR 1394 */ 1395static int 1396siocdifaddr(const char *ifname, struct in_addr addr) 1397{ 1398 struct ifreq delreq; 1399 struct sockaddr_in *sa; 1400 1401 memset(&delreq, 0, sizeof(delreq)); 1402 strncpy(delreq.ifr_name, ifname, sizeof(delreq.ifr_name)); 1403 sa = (struct sockaddr_in *)(void *)&delreq.ifr_addr; 1404 sa->sin_family = AF_INET; 1405 sa->sin_len = sizeof(*sa); 1406 sa->sin_addr = addr; 1407 1408 return (ioctl(mib_netsock, SIOCDIFADDR, &delreq)); 1409} 1410 1411/* 1412 * Verify an interface address without fetching the entire list 1413 */ 1414static int 1415verify_ifa(const char *name, struct mibifa *ifa) 1416{ 1417 struct ifreq req; 1418 struct sockaddr_in *sa; 1419 1420 memset(&req, 0, sizeof(req)); 1421 strncpy(req.ifr_name, name, sizeof(req.ifr_name)); 1422 sa = (struct sockaddr_in *)(void *)&req.ifr_addr; 1423 sa->sin_family = AF_INET; 1424 sa->sin_len = sizeof(*sa); 1425 sa->sin_addr = ifa->inaddr; 1426 1427 if (ioctl(mib_netsock, SIOCGIFADDR, &req) == -1) 1428 return (-1); 1429 if (ifa->inaddr.s_addr != sa->sin_addr.s_addr) { 1430 syslog(LOG_ERR, "%s: address mismatch", __func__); 1431 return (-1); 1432 } 1433 1434 if (ioctl(mib_netsock, SIOCGIFNETMASK, &req) == -1) 1435 return (-1); 1436 if (ifa->inmask.s_addr != sa->sin_addr.s_addr) { 1437 syslog(LOG_ERR, "%s: netmask mismatch", __func__); 1438 return (-1); 1439 } 1440 return (0); 1441} 1442 1443/* 1444 * Restore a deleted interface address. Don't wait for the routing socket 1445 * to update us. 1446 */ 1447void 1448mib_undestroy_ifa(struct mibifa *ifa) 1449{ 1450 struct mibif *ifp; 1451 1452 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) 1453 /* keep it destroyed */ 1454 return; 1455 1456 if (siocaifaddr(ifp->name, ifa->inaddr, ifa->inmask, ifa->inbcast)) 1457 /* keep it destroyed */ 1458 return; 1459 1460 ifa->flags &= ~MIBIFA_DESTROYED; 1461} 1462 1463/* 1464 * Destroy an interface address 1465 */ 1466int 1467mib_destroy_ifa(struct mibifa *ifa) 1468{ 1469 struct mibif *ifp; 1470 1471 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) { 1472 /* ups. */ 1473 mib_iflist_bad = 1; 1474 return (-1); 1475 } 1476 if (siocdifaddr(ifp->name, ifa->inaddr)) { 1477 /* ups. */ 1478 syslog(LOG_ERR, "SIOCDIFADDR: %m"); 1479 mib_iflist_bad = 1; 1480 return (-1); 1481 } 1482 ifa->flags |= MIBIFA_DESTROYED; 1483 return (0); 1484} 1485 1486/* 1487 * Rollback the modification of an address. Don't bother to wait for 1488 * the routing socket. 1489 */ 1490void 1491mib_unmodify_ifa(struct mibifa *ifa) 1492{ 1493 struct mibif *ifp; 1494 1495 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) { 1496 /* ups. */ 1497 mib_iflist_bad = 1; 1498 return; 1499 } 1500 1501 if (siocaifaddr(ifp->name, ifa->inaddr, ifa->inmask, ifa->inbcast)) { 1502 /* ups. */ 1503 mib_iflist_bad = 1; 1504 return; 1505 } 1506} 1507 1508/* 1509 * Modify an IFA. 1510 */ 1511int 1512mib_modify_ifa(struct mibifa *ifa) 1513{ 1514 struct mibif *ifp; 1515 1516 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) { 1517 /* ups. */ 1518 mib_iflist_bad = 1; 1519 return (-1); 1520 } 1521 1522 if (siocaifaddr(ifp->name, ifa->inaddr, ifa->inmask, ifa->inbcast)) { 1523 /* ups. */ 1524 mib_iflist_bad = 1; 1525 return (-1); 1526 } 1527 1528 if (verify_ifa(ifp->name, ifa)) { 1529 /* ups. */ 1530 mib_iflist_bad = 1; 1531 return (-1); 1532 } 1533 1534 return (0); 1535} 1536 1537/* 1538 * Destroy a freshly created interface address. Don't bother to wait for 1539 * the routing socket. 1540 */ 1541void 1542mib_uncreate_ifa(struct mibifa *ifa) 1543{ 1544 struct mibif *ifp; 1545 1546 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) { 1547 /* ups. */ 1548 mib_iflist_bad = 1; 1549 return; 1550 } 1551 if (siocdifaddr(ifp->name, ifa->inaddr)) { 1552 /* ups. */ 1553 mib_iflist_bad = 1; 1554 return; 1555 } 1556 1557 destroy_ifa(ifa); 1558} 1559 1560/* 1561 * Create a new ifa and verify it 1562 */ 1563struct mibifa * 1564mib_create_ifa(u_int ifindex, struct in_addr addr, struct in_addr mask, 1565 struct in_addr bcast) 1566{ 1567 struct mibif *ifp; 1568 struct mibifa *ifa; 1569 1570 if ((ifp = mib_find_if(ifindex)) == NULL) 1571 return (NULL); 1572 if ((ifa = alloc_ifa(ifindex, addr)) == NULL) 1573 return (NULL); 1574 ifa->inmask = mask; 1575 ifa->inbcast = bcast; 1576 1577 if (siocaifaddr(ifp->name, ifa->inaddr, ifa->inmask, ifa->inbcast)) { 1578 syslog(LOG_ERR, "%s: %m", __func__); 1579 destroy_ifa(ifa); 1580 return (NULL); 1581 } 1582 if (verify_ifa(ifp->name, ifa)) { 1583 destroy_ifa(ifa); 1584 return (NULL); 1585 } 1586 return (ifa); 1587} 1588 1589/* 1590 * Get all cloning interfaces and make them dynamic. 1591 * Hah! Whe should probably do this on a periodic basis (XXX). 1592 */ 1593static void 1594get_cloners(void) 1595{ 1596 struct if_clonereq req; 1597 char *buf, *cp; 1598 int i; 1599 1600 memset(&req, 0, sizeof(req)); 1601 if (ioctl(mib_netsock, SIOCIFGCLONERS, &req) == -1) { 1602 syslog(LOG_ERR, "get cloners: %m"); 1603 return; 1604 } 1605 if ((buf = malloc(req.ifcr_total * IFNAMSIZ)) == NULL) { 1606 syslog(LOG_ERR, "%m"); 1607 return; 1608 } 1609 req.ifcr_count = req.ifcr_total; 1610 req.ifcr_buffer = buf; 1611 if (ioctl(mib_netsock, SIOCIFGCLONERS, &req) == -1) { 1612 syslog(LOG_ERR, "get cloners: %m"); 1613 free(buf); 1614 return; 1615 } 1616 for (cp = buf, i = 0; i < req.ifcr_total; i++, cp += IFNAMSIZ) 1617 mib_if_set_dyn(cp); 1618 free(buf); 1619} 1620 1621/* 1622 * Idle function 1623 */ 1624static void 1625mibII_idle(void *arg __unused) 1626{ 1627 struct mibifa *ifa; 1628 1629 if (mib_iflist_bad) { 1630 TAILQ_FOREACH(ifa, &mibifa_list, link) 1631 ifa->flags &= ~MIBIFA_DESTROYED; 1632 1633 /* assume, that all cloning interfaces are dynamic */ 1634 get_cloners(); 1635 1636 mib_refresh_iflist(); 1637 update_ifa_info(); 1638 mib_arp_update(); 1639 mib_iflist_bad = 0; 1640 } 1641 1642 mib_arp_update(); 1643} 1644 1645 1646/* 1647 * Start the module 1648 */ 1649static void 1650mibII_start(void) 1651{ 1652 if ((route_fd = fd_select(route, route_input, NULL, module)) == NULL) { 1653 syslog(LOG_ERR, "fd_select(route): %m"); 1654 return; 1655 } 1656 mib_refresh_iflist(); 1657 update_ifa_info(); 1658 mib_arp_update(); 1659 (void)mib_fetch_route(); 1660 mib_iftable_last_change = 0; 1661 mib_ifstack_last_change = 0; 1662 1663 ifmib_reg = or_register(&oid_ifMIB, 1664 "The MIB module to describe generic objects for network interface" 1665 " sub-layers.", module); 1666 1667 ipmib_reg = or_register(&oid_ipMIB, 1668 "The MIB module for managing IP and ICMP implementations, but " 1669 "excluding their management of IP routes.", module); 1670 1671 tcpmib_reg = or_register(&oid_tcpMIB, 1672 "The MIB module for managing TCP implementations.", module); 1673 1674 udpmib_reg = or_register(&oid_udpMIB, 1675 "The MIB module for managing UDP implementations.", module); 1676 1677 ipForward_reg = or_register(&oid_ipForward, 1678 "The MIB module for the display of CIDR multipath IP Routes.", 1679 module); 1680 1681 mibII_poll_timer = NULL; 1682 mibII_poll_ticks = MIBII_POLL_TICKS; 1683 mibif_restart_mibII_poll_timer(); 1684} 1685 1686/* 1687 * Initialize the module 1688 */ 1689static int 1690mibII_init(struct lmodule *mod, int argc __unused, char *argv[] __unused) 1691{ 1692 size_t len; 1693 1694 module = mod; 1695 1696 len = sizeof(clockinfo); 1697 if (sysctlbyname("kern.clockrate", &clockinfo, &len, NULL, 0) == -1) { 1698 syslog(LOG_ERR, "kern.clockrate: %m"); 1699 return (-1); 1700 } 1701 if (len != sizeof(clockinfo)) { 1702 syslog(LOG_ERR, "kern.clockrate: wrong size"); 1703 return (-1); 1704 } 1705 1706 if ((route = socket(PF_ROUTE, SOCK_RAW, AF_UNSPEC)) == -1) { 1707 syslog(LOG_ERR, "PF_ROUTE: %m"); 1708 return (-1); 1709 } 1710 1711 if ((mib_netsock = socket(PF_INET, SOCK_DGRAM, 0)) == -1) { 1712 syslog(LOG_ERR, "PF_INET: %m"); 1713 (void)close(route); 1714 return (-1); 1715 } 1716 (void)shutdown(mib_netsock, SHUT_RDWR); 1717 1718 /* assume, that all cloning interfaces are dynamic */ 1719 get_cloners(); 1720 1721 return (0); 1722} 1723 1724static int 1725mibII_fini(void) 1726{ 1727 if (mibII_poll_timer != NULL ) { 1728 timer_stop(mibII_poll_timer); 1729 mibII_poll_timer = NULL; 1730 } 1731 1732 if (route_fd != NULL) 1733 fd_deselect(route_fd); 1734 if (route != -1) 1735 (void)close(route); 1736 if (mib_netsock != -1) 1737 (void)close(mib_netsock); 1738 /* XXX free memory */ 1739 1740 or_unregister(ipForward_reg); 1741 or_unregister(udpmib_reg); 1742 or_unregister(tcpmib_reg); 1743 or_unregister(ipmib_reg); 1744 or_unregister(ifmib_reg); 1745 1746 return (0); 1747} 1748 1749static void 1750mibII_loading(const struct lmodule *mod, int loaded) 1751{ 1752 struct mibif *ifp; 1753 1754 if (loaded == 1) 1755 return; 1756 1757 TAILQ_FOREACH(ifp, &mibif_list, link) 1758 if (ifp->xnotify_mod == mod) { 1759 ifp->xnotify_mod = NULL; 1760 ifp->xnotify_data = NULL; 1761 ifp->xnotify = NULL; 1762 } 1763 1764 mib_unregister_newif(mod); 1765} 1766 1767const struct snmp_module config = { 1768 "This module implements the interface and ip groups.", 1769 mibII_init, 1770 mibII_fini, 1771 NULL, /* idle */ 1772 NULL, /* dump */ 1773 NULL, /* config */ 1774 mibII_start, 1775 NULL, 1776 mibII_ctree, 1777 mibII_CTREE_SIZE, 1778 mibII_loading 1779}; 1780 1781/* 1782 * Should have a list of these attached to each interface. 1783 */ 1784void * 1785mibif_notify(struct mibif *ifp, const struct lmodule *mod, 1786 mibif_notify_f func, void *data) 1787{ 1788 ifp->xnotify = func; 1789 ifp->xnotify_data = data; 1790 ifp->xnotify_mod = mod; 1791 1792 return (ifp); 1793} 1794 1795void 1796mibif_unnotify(void *arg) 1797{ 1798 struct mibif *ifp = arg; 1799 1800 ifp->xnotify = NULL; 1801 ifp->xnotify_data = NULL; 1802 ifp->xnotify_mod = NULL; 1803} 1804