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 */ 42 static struct lmodule *module; 43 44 /* routing socket */ 45 static int route; 46 static void *route_fd; 47 48 /* if-index allocator */ 49 static uint32_t next_if_index = 1; 50 51 /* currently fetching the arp table */ 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 uint64_t mib_iftable_last_change; 89 90 /* last change of stack table */ 91 uint64_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 uint64_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 /* baud rate of fastest interface */ 109 uint64_t mibif_maxspeed; 110 111 /* user-forced update interval */ 112 u_int mibif_force_hc_update_interval; 113 114 /* current update interval */ 115 u_int mibif_hc_update_interval; 116 117 /* HC update timer handle */ 118 static void *hc_update_timer; 119 120 /* Idle poll timer */ 121 static void *mibII_poll_timer; 122 123 /* interfaces' data poll interval */ 124 u_int mibII_poll_ticks; 125 126 /* Idle poll hook */ 127 static void mibII_idle(void *arg __unused); 128 129 /*****************************/ 130 131 static const struct asn_oid oid_ifMIB = OIDX_ifMIB; 132 static const struct asn_oid oid_ipMIB = OIDX_ipMIB; 133 static const struct asn_oid oid_tcpMIB = OIDX_tcpMIB; 134 static const struct asn_oid oid_udpMIB = OIDX_udpMIB; 135 static const struct asn_oid oid_ipForward = OIDX_ipForward; 136 static const struct asn_oid oid_linkDown = OIDX_linkDown; 137 static const struct asn_oid oid_linkUp = OIDX_linkUp; 138 static const struct asn_oid oid_ifIndex = OIDX_ifIndex; 139 140 /*****************************/ 141 142 /* 143 * Find an interface 144 */ 145 struct mibif * 146 mib_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 } 155 156 struct mibif * 157 mib_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 } 166 167 struct mibif * 168 mib_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 */ 182 int 183 mib_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 */ 197 void 198 mib_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 */ 214 int 215 mib_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 } 234 235 void 236 mib_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 } 248 249 struct mibif * 250 mib_first_if(void) 251 { 252 return (TAILQ_FIRST(&mibif_list)); 253 } 254 struct mibif * 255 mib_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 */ 263 int 264 mib_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 */ 290 static void 291 link_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 */ 307 static int 308 fetch_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 */ 367 static void 368 update_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 */ 382 void 383 mibif_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 */ 425 void 426 mibif_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 */ 439 int 440 mib_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 */ 522 struct mibifa * 523 mib_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 } 532 533 struct mibifa * 534 mib_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 */ 548 static struct mibifa * 549 alloc_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 */ 580 static void 581 destroy_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 */ 592 void 593 mib_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 */ 610 static void 611 get_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 */ 669 static void 670 mibif_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 */ 744 static struct mibif * 745 mibif_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 */ 816 static void 817 notify_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 */ 831 static void 832 check_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 */ 864 void 865 mib_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 */ 925 struct mibifa * 926 mib_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 * Handle a routing socket message. 938 */ 939 static void 940 handle_rtmsg(struct rt_msghdr *rtm) 941 { 942 struct sockaddr *addrs[RTAX_MAX]; 943 struct if_msghdr *ifm; 944 struct ifa_msghdr ifam; 945 struct ifma_msghdr *ifmam; 946 #ifdef RTM_IFANNOUNCE 947 struct if_announcemsghdr *ifan; 948 #endif 949 struct mibif *ifp; 950 struct sockaddr_dl *sdl; 951 struct sockaddr_in *sa; 952 struct mibifa *ifa; 953 struct mibrcvaddr *rcv; 954 u_char *ptr; 955 956 if (rtm->rtm_version != RTM_VERSION) { 957 syslog(LOG_ERR, "Bogus RTM version %u", rtm->rtm_version); 958 return; 959 } 960 961 switch (rtm->rtm_type) { 962 963 case RTM_NEWADDR: 964 memcpy(&ifam, rtm, sizeof(ifam)); 965 mib_extract_addrs(ifam.ifam_addrs, (u_char *)(&ifam + 1), addrs); 966 if (addrs[RTAX_IFA] == NULL || addrs[RTAX_NETMASK] == NULL) 967 break; 968 969 sa = (struct sockaddr_in *)(void *)addrs[RTAX_IFA]; 970 if ((ifa = mib_find_ifa(sa->sin_addr)) == NULL) { 971 /* unknown address */ 972 if ((ifp = mib_find_if_sys(ifam.ifam_index)) == NULL) { 973 syslog(LOG_WARNING, "RTM_NEWADDR for unknown " 974 "interface %u", ifam.ifam_index); 975 break; 976 } 977 if ((ifa = alloc_ifa(ifp->index, sa->sin_addr)) == NULL) 978 break; 979 } 980 sa = (struct sockaddr_in *)(void *)addrs[RTAX_NETMASK]; 981 ifa->inmask = sa->sin_addr; 982 983 if (addrs[RTAX_BRD] != NULL) { 984 sa = (struct sockaddr_in *)(void *)addrs[RTAX_BRD]; 985 ifa->inbcast = sa->sin_addr; 986 } 987 ifa->flags |= MIBIFA_FOUND; 988 break; 989 990 case RTM_DELADDR: 991 memcpy(&ifam, rtm, sizeof(ifam)); 992 mib_extract_addrs(ifam.ifam_addrs, (u_char *)(&ifam + 1), addrs); 993 if (addrs[RTAX_IFA] == NULL) 994 break; 995 996 sa = (struct sockaddr_in *)(void *)addrs[RTAX_IFA]; 997 if ((ifa = mib_find_ifa(sa->sin_addr)) != NULL) { 998 ifa->flags |= MIBIFA_FOUND; 999 if (!(ifa->flags & MIBIFA_DESTROYED)) 1000 destroy_ifa(ifa); 1001 } 1002 break; 1003 1004 case RTM_NEWMADDR: 1005 ifmam = (struct ifma_msghdr *)rtm; 1006 mib_extract_addrs(ifmam->ifmam_addrs, (u_char *)(ifmam + 1), addrs); 1007 if (addrs[RTAX_IFA] == NULL || 1008 addrs[RTAX_IFA]->sa_family != AF_LINK) 1009 break; 1010 sdl = (struct sockaddr_dl *)(void *)addrs[RTAX_IFA]; 1011 if ((rcv = mib_find_rcvaddr(sdl->sdl_index, 1012 sdl->sdl_data + sdl->sdl_nlen, sdl->sdl_alen)) == NULL) { 1013 /* unknown address */ 1014 if ((ifp = mib_find_if_sys(sdl->sdl_index)) == NULL) { 1015 syslog(LOG_WARNING, "RTM_NEWMADDR for unknown " 1016 "interface %u", sdl->sdl_index); 1017 break; 1018 } 1019 if ((rcv = mib_rcvaddr_create(ifp, 1020 sdl->sdl_data + sdl->sdl_nlen, sdl->sdl_alen)) == NULL) 1021 break; 1022 rcv->flags |= MIBRCVADDR_VOLATILE; 1023 } 1024 rcv->flags |= MIBRCVADDR_FOUND; 1025 break; 1026 1027 case RTM_DELMADDR: 1028 ifmam = (struct ifma_msghdr *)rtm; 1029 mib_extract_addrs(ifmam->ifmam_addrs, (u_char *)(ifmam + 1), addrs); 1030 if (addrs[RTAX_IFA] == NULL || 1031 addrs[RTAX_IFA]->sa_family != AF_LINK) 1032 break; 1033 sdl = (struct sockaddr_dl *)(void *)addrs[RTAX_IFA]; 1034 if ((rcv = mib_find_rcvaddr(sdl->sdl_index, 1035 sdl->sdl_data + sdl->sdl_nlen, sdl->sdl_alen)) != NULL) 1036 mib_rcvaddr_delete(rcv); 1037 break; 1038 1039 case RTM_IFINFO: 1040 ifm = (struct if_msghdr *)(void *)rtm; 1041 mib_extract_addrs(ifm->ifm_addrs, (u_char *)(ifm + 1), addrs); 1042 if ((ifp = mib_find_if_sys(ifm->ifm_index)) == NULL) 1043 break; 1044 if (addrs[RTAX_IFP] != NULL && 1045 addrs[RTAX_IFP]->sa_family == AF_LINK) { 1046 sdl = (struct sockaddr_dl *)(void *)addrs[RTAX_IFP]; 1047 ptr = sdl->sdl_data + sdl->sdl_nlen; 1048 get_physaddr(ifp, sdl, ptr); 1049 } 1050 (void)mib_fetch_ifmib(ifp); 1051 break; 1052 1053 #ifdef RTM_IFANNOUNCE 1054 case RTM_IFANNOUNCE: 1055 ifan = (struct if_announcemsghdr *)rtm; 1056 ifp = mib_find_if_sys(ifan->ifan_index); 1057 1058 switch (ifan->ifan_what) { 1059 1060 case IFAN_ARRIVAL: 1061 if (ifp == NULL && (ifp = mibif_create(ifan->ifan_index, 1062 ifan->ifan_name)) != NULL) { 1063 (void)mib_fetch_ifmib(ifp); 1064 check_llbcast(ifp); 1065 notify_newif(ifp); 1066 } 1067 break; 1068 1069 case IFAN_DEPARTURE: 1070 if (ifp != NULL) 1071 mibif_free(ifp); 1072 break; 1073 } 1074 break; 1075 #endif 1076 case RTM_GET: 1077 case RTM_ADD: 1078 case RTM_DELETE: 1079 mib_extract_addrs(rtm->rtm_addrs, (u_char *)(rtm + 1), addrs); 1080 1081 if (rtm->rtm_errno == 0 && (rtm->rtm_flags & RTF_UP)) 1082 mib_sroute_process(rtm, addrs[RTAX_GATEWAY], 1083 addrs[RTAX_DST], addrs[RTAX_NETMASK]); 1084 break; 1085 } 1086 } 1087 1088 /* 1089 * send a routing message 1090 */ 1091 void 1092 mib_send_rtmsg(struct rt_msghdr *rtm, struct sockaddr *gw, 1093 struct sockaddr *dst, struct sockaddr *mask) 1094 { 1095 size_t len; 1096 struct rt_msghdr *msg; 1097 char *cp; 1098 ssize_t sent; 1099 1100 len = sizeof(*rtm) + SA_SIZE(gw) + SA_SIZE(dst) + SA_SIZE(mask); 1101 if ((msg = malloc(len)) == NULL) { 1102 syslog(LOG_ERR, "%s: %m", __func__); 1103 return; 1104 } 1105 cp = (char *)(msg + 1); 1106 1107 memset(msg, 0, sizeof(*msg)); 1108 msg->rtm_flags = 0; 1109 msg->rtm_version = RTM_VERSION; 1110 msg->rtm_addrs = RTA_DST | RTA_GATEWAY; 1111 1112 memcpy(cp, dst, SA_SIZE(dst)); 1113 cp += SA_SIZE(dst); 1114 memcpy(cp, gw, SA_SIZE(gw)); 1115 cp += SA_SIZE(gw); 1116 if (mask != NULL) { 1117 memcpy(cp, mask, SA_SIZE(mask)); 1118 cp += SA_SIZE(mask); 1119 msg->rtm_addrs |= RTA_NETMASK; 1120 } 1121 msg->rtm_msglen = cp - (char *)msg; 1122 msg->rtm_type = RTM_GET; 1123 if ((sent = write(route, msg, msg->rtm_msglen)) == -1) { 1124 syslog(LOG_ERR, "%s: write: %m", __func__); 1125 free(msg); 1126 return; 1127 } 1128 if (sent != msg->rtm_msglen) { 1129 syslog(LOG_ERR, "%s: short write", __func__); 1130 free(msg); 1131 return; 1132 } 1133 free(msg); 1134 } 1135 1136 /* 1137 * Fetch the routing table via sysctl 1138 */ 1139 u_char * 1140 mib_fetch_rtab(int af, int info, int arg, size_t *lenp) 1141 { 1142 int name[6]; 1143 u_char *buf, *newbuf; 1144 1145 name[0] = CTL_NET; 1146 name[1] = PF_ROUTE; 1147 name[2] = 0; 1148 name[3] = af; 1149 name[4] = info; 1150 name[5] = arg; 1151 1152 *lenp = 0; 1153 1154 /* initial estimate */ 1155 if (sysctl(name, 6, NULL, lenp, NULL, 0) == -1) { 1156 syslog(LOG_ERR, "sysctl estimate (%d,%d,%d,%d,%d,%d): %m", 1157 name[0], name[1], name[2], name[3], name[4], name[5]); 1158 return (NULL); 1159 } 1160 if (*lenp == 0) 1161 return (NULL); 1162 1163 buf = NULL; 1164 for (;;) { 1165 if ((newbuf = realloc(buf, *lenp)) == NULL) { 1166 syslog(LOG_ERR, "sysctl buffer: %m"); 1167 free(buf); 1168 return (NULL); 1169 } 1170 buf = newbuf; 1171 1172 if (sysctl(name, 6, buf, lenp, NULL, 0) == 0) 1173 break; 1174 1175 if (errno != ENOMEM) { 1176 syslog(LOG_ERR, "sysctl get: %m"); 1177 free(buf); 1178 return (NULL); 1179 } 1180 *lenp += *lenp / 8 + 1; 1181 } 1182 1183 return (buf); 1184 } 1185 1186 /* 1187 * Update the following info: interface, interface addresses, interface 1188 * receive addresses, arp-table. 1189 * This does not change the interface list itself. 1190 */ 1191 static void 1192 update_ifa_info(void) 1193 { 1194 u_char *buf, *next; 1195 struct rt_msghdr *rtm; 1196 struct mibifa *ifa, *ifa1; 1197 struct mibrcvaddr *rcv, *rcv1; 1198 size_t needed; 1199 static const int infos[][3] = { 1200 { 0, NET_RT_IFLIST, 0 }, 1201 #ifdef NET_RT_IFMALIST 1202 { AF_LINK, NET_RT_IFMALIST, 0 }, 1203 #endif 1204 }; 1205 u_int i; 1206 1207 TAILQ_FOREACH(ifa, &mibifa_list, link) 1208 ifa->flags &= ~MIBIFA_FOUND; 1209 TAILQ_FOREACH(rcv, &mibrcvaddr_list, link) 1210 rcv->flags &= ~MIBRCVADDR_FOUND; 1211 1212 for (i = 0; i < sizeof(infos) / sizeof(infos[0]); i++) { 1213 if ((buf = mib_fetch_rtab(infos[i][0], infos[i][1], infos[i][2], 1214 &needed)) == NULL) 1215 continue; 1216 1217 next = buf; 1218 while (next < buf + needed) { 1219 rtm = (struct rt_msghdr *)(void *)next; 1220 next += rtm->rtm_msglen; 1221 handle_rtmsg(rtm); 1222 } 1223 free(buf); 1224 } 1225 1226 /* 1227 * Purge the address list of unused entries. These may happen for 1228 * interface aliases that are on the same subnet. We don't receive 1229 * routing socket messages for them. 1230 */ 1231 ifa = TAILQ_FIRST(&mibifa_list); 1232 while (ifa != NULL) { 1233 ifa1 = TAILQ_NEXT(ifa, link); 1234 if (!(ifa->flags & MIBIFA_FOUND)) 1235 destroy_ifa(ifa); 1236 ifa = ifa1; 1237 } 1238 1239 rcv = TAILQ_FIRST(&mibrcvaddr_list); 1240 while (rcv != NULL) { 1241 rcv1 = TAILQ_NEXT(rcv, link); 1242 if (!(rcv->flags & (MIBRCVADDR_FOUND | MIBRCVADDR_BCAST | 1243 MIBRCVADDR_HW))) 1244 mib_rcvaddr_delete(rcv); 1245 rcv = rcv1; 1246 } 1247 } 1248 1249 /* 1250 * Update arp table 1251 * 1252 */ 1253 void 1254 mib_arp_update(void) 1255 { 1256 struct mibarp *at, *at1; 1257 size_t needed; 1258 u_char *buf, *next; 1259 struct rt_msghdr *rtm; 1260 1261 if (in_update_arp) 1262 return; /* Aaargh */ 1263 in_update_arp = 1; 1264 1265 TAILQ_FOREACH(at, &mibarp_list, link) 1266 at->flags &= ~MIBARP_FOUND; 1267 1268 if ((buf = mib_fetch_rtab(AF_INET, NET_RT_FLAGS, 0, &needed)) == NULL) { 1269 in_update_arp = 0; 1270 return; 1271 } 1272 1273 next = buf; 1274 while (next < buf + needed) { 1275 rtm = (struct rt_msghdr *)(void *)next; 1276 next += rtm->rtm_msglen; 1277 handle_rtmsg(rtm); 1278 } 1279 free(buf); 1280 1281 at = TAILQ_FIRST(&mibarp_list); 1282 while (at != NULL) { 1283 at1 = TAILQ_NEXT(at, link); 1284 if (!(at->flags & MIBARP_FOUND)) 1285 mib_arp_delete(at); 1286 at = at1; 1287 } 1288 mibarpticks = get_ticks(); 1289 in_update_arp = 0; 1290 } 1291 1292 1293 /* 1294 * Intput on the routing socket. 1295 */ 1296 static void 1297 route_input(int fd, void *udata __unused) 1298 { 1299 u_char buf[1024 * 16]; 1300 ssize_t n; 1301 struct rt_msghdr *rtm; 1302 1303 if ((n = read(fd, buf, sizeof(buf))) == -1) 1304 err(1, "read(rt_socket)"); 1305 1306 if (n == 0) 1307 errx(1, "EOF on rt_socket"); 1308 1309 rtm = (struct rt_msghdr *)(void *)buf; 1310 if ((size_t)n != rtm->rtm_msglen) 1311 errx(1, "n=%zu, rtm_msglen=%u", (size_t)n, rtm->rtm_msglen); 1312 1313 handle_rtmsg(rtm); 1314 } 1315 1316 /* 1317 * execute and SIOCAIFADDR 1318 */ 1319 static int 1320 siocaifaddr(char *ifname, struct in_addr addr, struct in_addr mask, 1321 struct in_addr bcast) 1322 { 1323 struct ifaliasreq addreq; 1324 struct sockaddr_in *sa; 1325 1326 memset(&addreq, 0, sizeof(addreq)); 1327 strncpy(addreq.ifra_name, ifname, sizeof(addreq.ifra_name)); 1328 1329 sa = (struct sockaddr_in *)(void *)&addreq.ifra_addr; 1330 sa->sin_family = AF_INET; 1331 sa->sin_len = sizeof(*sa); 1332 sa->sin_addr = addr; 1333 1334 sa = (struct sockaddr_in *)(void *)&addreq.ifra_mask; 1335 sa->sin_family = AF_INET; 1336 sa->sin_len = sizeof(*sa); 1337 sa->sin_addr = mask; 1338 1339 sa = (struct sockaddr_in *)(void *)&addreq.ifra_broadaddr; 1340 sa->sin_family = AF_INET; 1341 sa->sin_len = sizeof(*sa); 1342 sa->sin_addr = bcast; 1343 1344 return (ioctl(mib_netsock, SIOCAIFADDR, &addreq)); 1345 } 1346 1347 /* 1348 * Exececute a SIOCDIFADDR 1349 */ 1350 static int 1351 siocdifaddr(const char *ifname, struct in_addr addr) 1352 { 1353 struct ifreq delreq; 1354 struct sockaddr_in *sa; 1355 1356 memset(&delreq, 0, sizeof(delreq)); 1357 strncpy(delreq.ifr_name, ifname, sizeof(delreq.ifr_name)); 1358 sa = (struct sockaddr_in *)(void *)&delreq.ifr_addr; 1359 sa->sin_family = AF_INET; 1360 sa->sin_len = sizeof(*sa); 1361 sa->sin_addr = addr; 1362 1363 return (ioctl(mib_netsock, SIOCDIFADDR, &delreq)); 1364 } 1365 1366 /* 1367 * Verify an interface address without fetching the entire list 1368 */ 1369 static int 1370 verify_ifa(const char *name, struct mibifa *ifa) 1371 { 1372 struct ifreq req; 1373 struct sockaddr_in *sa; 1374 1375 memset(&req, 0, sizeof(req)); 1376 strncpy(req.ifr_name, name, sizeof(req.ifr_name)); 1377 sa = (struct sockaddr_in *)(void *)&req.ifr_addr; 1378 sa->sin_family = AF_INET; 1379 sa->sin_len = sizeof(*sa); 1380 sa->sin_addr = ifa->inaddr; 1381 1382 if (ioctl(mib_netsock, SIOCGIFADDR, &req) == -1) 1383 return (-1); 1384 if (ifa->inaddr.s_addr != sa->sin_addr.s_addr) { 1385 syslog(LOG_ERR, "%s: address mismatch", __func__); 1386 return (-1); 1387 } 1388 1389 if (ioctl(mib_netsock, SIOCGIFNETMASK, &req) == -1) 1390 return (-1); 1391 if (ifa->inmask.s_addr != sa->sin_addr.s_addr) { 1392 syslog(LOG_ERR, "%s: netmask mismatch", __func__); 1393 return (-1); 1394 } 1395 return (0); 1396 } 1397 1398 /* 1399 * Restore a deleted interface address. Don't wait for the routing socket 1400 * to update us. 1401 */ 1402 void 1403 mib_undestroy_ifa(struct mibifa *ifa) 1404 { 1405 struct mibif *ifp; 1406 1407 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) 1408 /* keep it destroyed */ 1409 return; 1410 1411 if (siocaifaddr(ifp->name, ifa->inaddr, ifa->inmask, ifa->inbcast)) 1412 /* keep it destroyed */ 1413 return; 1414 1415 ifa->flags &= ~MIBIFA_DESTROYED; 1416 } 1417 1418 /* 1419 * Destroy an interface address 1420 */ 1421 int 1422 mib_destroy_ifa(struct mibifa *ifa) 1423 { 1424 struct mibif *ifp; 1425 1426 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) { 1427 /* ups. */ 1428 mib_iflist_bad = 1; 1429 return (-1); 1430 } 1431 if (siocdifaddr(ifp->name, ifa->inaddr)) { 1432 /* ups. */ 1433 syslog(LOG_ERR, "SIOCDIFADDR: %m"); 1434 mib_iflist_bad = 1; 1435 return (-1); 1436 } 1437 ifa->flags |= MIBIFA_DESTROYED; 1438 return (0); 1439 } 1440 1441 /* 1442 * Rollback the modification of an address. Don't bother to wait for 1443 * the routing socket. 1444 */ 1445 void 1446 mib_unmodify_ifa(struct mibifa *ifa) 1447 { 1448 struct mibif *ifp; 1449 1450 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) { 1451 /* ups. */ 1452 mib_iflist_bad = 1; 1453 return; 1454 } 1455 1456 if (siocaifaddr(ifp->name, ifa->inaddr, ifa->inmask, ifa->inbcast)) { 1457 /* ups. */ 1458 mib_iflist_bad = 1; 1459 return; 1460 } 1461 } 1462 1463 /* 1464 * Modify an IFA. 1465 */ 1466 int 1467 mib_modify_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 1477 if (siocaifaddr(ifp->name, ifa->inaddr, ifa->inmask, ifa->inbcast)) { 1478 /* ups. */ 1479 mib_iflist_bad = 1; 1480 return (-1); 1481 } 1482 1483 if (verify_ifa(ifp->name, ifa)) { 1484 /* ups. */ 1485 mib_iflist_bad = 1; 1486 return (-1); 1487 } 1488 1489 return (0); 1490 } 1491 1492 /* 1493 * Destroy a freshly created interface address. Don't bother to wait for 1494 * the routing socket. 1495 */ 1496 void 1497 mib_uncreate_ifa(struct mibifa *ifa) 1498 { 1499 struct mibif *ifp; 1500 1501 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) { 1502 /* ups. */ 1503 mib_iflist_bad = 1; 1504 return; 1505 } 1506 if (siocdifaddr(ifp->name, ifa->inaddr)) { 1507 /* ups. */ 1508 mib_iflist_bad = 1; 1509 return; 1510 } 1511 1512 destroy_ifa(ifa); 1513 } 1514 1515 /* 1516 * Create a new ifa and verify it 1517 */ 1518 struct mibifa * 1519 mib_create_ifa(u_int ifindex, struct in_addr addr, struct in_addr mask, 1520 struct in_addr bcast) 1521 { 1522 struct mibif *ifp; 1523 struct mibifa *ifa; 1524 1525 if ((ifp = mib_find_if(ifindex)) == NULL) 1526 return (NULL); 1527 if ((ifa = alloc_ifa(ifindex, addr)) == NULL) 1528 return (NULL); 1529 ifa->inmask = mask; 1530 ifa->inbcast = bcast; 1531 1532 if (siocaifaddr(ifp->name, ifa->inaddr, ifa->inmask, ifa->inbcast)) { 1533 syslog(LOG_ERR, "%s: %m", __func__); 1534 destroy_ifa(ifa); 1535 return (NULL); 1536 } 1537 if (verify_ifa(ifp->name, ifa)) { 1538 destroy_ifa(ifa); 1539 return (NULL); 1540 } 1541 return (ifa); 1542 } 1543 1544 /* 1545 * Get all cloning interfaces and make them dynamic. 1546 * Hah! Whe should probably do this on a periodic basis (XXX). 1547 */ 1548 static void 1549 get_cloners(void) 1550 { 1551 struct if_clonereq req; 1552 char *buf, *cp; 1553 int i; 1554 1555 memset(&req, 0, sizeof(req)); 1556 if (ioctl(mib_netsock, SIOCIFGCLONERS, &req) == -1) { 1557 syslog(LOG_ERR, "get cloners: %m"); 1558 return; 1559 } 1560 if ((buf = malloc(req.ifcr_total * IFNAMSIZ)) == NULL) { 1561 syslog(LOG_ERR, "%m"); 1562 return; 1563 } 1564 req.ifcr_count = req.ifcr_total; 1565 req.ifcr_buffer = buf; 1566 if (ioctl(mib_netsock, SIOCIFGCLONERS, &req) == -1) { 1567 syslog(LOG_ERR, "get cloners: %m"); 1568 free(buf); 1569 return; 1570 } 1571 for (cp = buf, i = 0; i < req.ifcr_total; i++, cp += IFNAMSIZ) 1572 mib_if_set_dyn(cp); 1573 free(buf); 1574 } 1575 1576 /* 1577 * Idle function 1578 */ 1579 static void 1580 mibII_idle(void *arg __unused) 1581 { 1582 struct mibifa *ifa; 1583 1584 if (mib_iflist_bad) { 1585 TAILQ_FOREACH(ifa, &mibifa_list, link) 1586 ifa->flags &= ~MIBIFA_DESTROYED; 1587 1588 /* assume, that all cloning interfaces are dynamic */ 1589 get_cloners(); 1590 1591 mib_refresh_iflist(); 1592 update_ifa_info(); 1593 mib_arp_update(); 1594 mib_iflist_bad = 0; 1595 } 1596 1597 mib_arp_update(); 1598 } 1599 1600 1601 /* 1602 * Start the module 1603 */ 1604 static void 1605 mibII_start(void) 1606 { 1607 if ((route_fd = fd_select(route, route_input, NULL, module)) == NULL) { 1608 syslog(LOG_ERR, "fd_select(route): %m"); 1609 return; 1610 } 1611 mib_refresh_iflist(); 1612 update_ifa_info(); 1613 mib_arp_update(); 1614 (void)mib_fetch_route(); 1615 mib_iftable_last_change = 0; 1616 mib_ifstack_last_change = 0; 1617 1618 ifmib_reg = or_register(&oid_ifMIB, 1619 "The MIB module to describe generic objects for network interface" 1620 " sub-layers.", module); 1621 1622 ipmib_reg = or_register(&oid_ipMIB, 1623 "The MIB module for managing IP and ICMP implementations, but " 1624 "excluding their management of IP routes.", module); 1625 1626 tcpmib_reg = or_register(&oid_tcpMIB, 1627 "The MIB module for managing TCP implementations.", module); 1628 1629 udpmib_reg = or_register(&oid_udpMIB, 1630 "The MIB module for managing UDP implementations.", module); 1631 1632 ipForward_reg = or_register(&oid_ipForward, 1633 "The MIB module for the display of CIDR multipath IP Routes.", 1634 module); 1635 1636 mibII_poll_timer = NULL; 1637 mibII_poll_ticks = MIBII_POLL_TICKS; 1638 mibif_restart_mibII_poll_timer(); 1639 } 1640 1641 /* 1642 * Initialize the module 1643 */ 1644 static int 1645 mibII_init(struct lmodule *mod, int argc __unused, char *argv[] __unused) 1646 { 1647 size_t len; 1648 1649 module = mod; 1650 1651 len = sizeof(clockinfo); 1652 if (sysctlbyname("kern.clockrate", &clockinfo, &len, NULL, 0) == -1) { 1653 syslog(LOG_ERR, "kern.clockrate: %m"); 1654 return (-1); 1655 } 1656 if (len != sizeof(clockinfo)) { 1657 syslog(LOG_ERR, "kern.clockrate: wrong size"); 1658 return (-1); 1659 } 1660 1661 if ((route = socket(PF_ROUTE, SOCK_RAW, AF_UNSPEC)) == -1) { 1662 syslog(LOG_ERR, "PF_ROUTE: %m"); 1663 return (-1); 1664 } 1665 1666 if ((mib_netsock = socket(PF_INET, SOCK_DGRAM, 0)) == -1) { 1667 syslog(LOG_ERR, "PF_INET: %m"); 1668 (void)close(route); 1669 return (-1); 1670 } 1671 (void)shutdown(mib_netsock, SHUT_RDWR); 1672 1673 /* assume, that all cloning interfaces are dynamic */ 1674 get_cloners(); 1675 1676 return (0); 1677 } 1678 1679 static int 1680 mibII_fini(void) 1681 { 1682 if (mibII_poll_timer != NULL ) { 1683 timer_stop(mibII_poll_timer); 1684 mibII_poll_timer = NULL; 1685 } 1686 1687 if (route_fd != NULL) 1688 fd_deselect(route_fd); 1689 if (route != -1) 1690 (void)close(route); 1691 if (mib_netsock != -1) 1692 (void)close(mib_netsock); 1693 /* XXX free memory */ 1694 1695 or_unregister(ipForward_reg); 1696 or_unregister(udpmib_reg); 1697 or_unregister(tcpmib_reg); 1698 or_unregister(ipmib_reg); 1699 or_unregister(ifmib_reg); 1700 1701 return (0); 1702 } 1703 1704 static void 1705 mibII_loading(const struct lmodule *mod, int loaded) 1706 { 1707 struct mibif *ifp; 1708 1709 if (loaded == 1) 1710 return; 1711 1712 TAILQ_FOREACH(ifp, &mibif_list, link) 1713 if (ifp->xnotify_mod == mod) { 1714 ifp->xnotify_mod = NULL; 1715 ifp->xnotify_data = NULL; 1716 ifp->xnotify = NULL; 1717 } 1718 1719 mib_unregister_newif(mod); 1720 } 1721 1722 const struct snmp_module config = { 1723 "This module implements the interface and ip groups.", 1724 mibII_init, 1725 mibII_fini, 1726 NULL, /* idle */ 1727 NULL, /* dump */ 1728 NULL, /* config */ 1729 mibII_start, 1730 NULL, 1731 mibII_ctree, 1732 mibII_CTREE_SIZE, 1733 mibII_loading 1734 }; 1735 1736 /* 1737 * Should have a list of these attached to each interface. 1738 */ 1739 void * 1740 mibif_notify(struct mibif *ifp, const struct lmodule *mod, 1741 mibif_notify_f func, void *data) 1742 { 1743 ifp->xnotify = func; 1744 ifp->xnotify_data = data; 1745 ifp->xnotify_mod = mod; 1746 1747 return (ifp); 1748 } 1749 1750 void 1751 mibif_unnotify(void *arg) 1752 { 1753 struct mibif *ifp = arg; 1754 1755 ifp->xnotify = NULL; 1756 ifp->xnotify_data = NULL; 1757 ifp->xnotify_mod = NULL; 1758 } 1759