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 struct ifreq irr; 447 448 if (fetch_generic_mib(ifp, &oldmib) == -1) 449 return (-1); 450 451 /* 452 * Quoting RFC2863, 3.1.15: "... LinkUp and linkDown traps are 453 * generated just after ifOperStatus leaves, or just before it 454 * enters, the down state, respectively;" 455 */ 456 if (ifp->trap_enable && ifp->mib.ifmd_data.ifi_link_state != 457 oldmib.ifmd_data.ifi_link_state && 458 (ifp->mib.ifmd_data.ifi_link_state == LINK_STATE_DOWN || 459 oldmib.ifmd_data.ifi_link_state == LINK_STATE_DOWN)) 460 link_trap(ifp, ifp->mib.ifmd_data.ifi_link_state == 461 LINK_STATE_UP ? 1 : 0); 462 463 ifp->flags &= ~(MIBIF_HIGHSPEED | MIBIF_VERYHIGHSPEED); 464 if (ifp->mib.ifmd_data.ifi_baudrate > 20000000) { 465 ifp->flags |= MIBIF_HIGHSPEED; 466 if (ifp->mib.ifmd_data.ifi_baudrate > 650000000) 467 ifp->flags |= MIBIF_VERYHIGHSPEED; 468 } 469 if (ifp->mib.ifmd_data.ifi_baudrate > mibif_maxspeed) { 470 mibif_maxspeed = ifp->mib.ifmd_data.ifi_baudrate; 471 mibif_reset_hc_timer(); 472 } 473 474 /* 475 * linkspecific MIB 476 */ 477 name[0] = CTL_NET; 478 name[1] = PF_LINK; 479 name[2] = NETLINK_GENERIC; 480 name[3] = IFMIB_IFDATA; 481 name[4] = ifp->sysindex; 482 name[5] = IFDATA_LINKSPECIFIC; 483 if (sysctl(name, 6, NULL, &len, NULL, 0) == -1) { 484 syslog(LOG_WARNING, "sysctl linkmib estimate (%s): %m", 485 ifp->name); 486 if (ifp->specmib != NULL) { 487 ifp->specmib = NULL; 488 ifp->specmiblen = 0; 489 } 490 goto out; 491 } 492 if (len == 0) { 493 if (ifp->specmib != NULL) { 494 ifp->specmib = NULL; 495 ifp->specmiblen = 0; 496 } 497 goto out; 498 } 499 500 if (ifp->specmiblen != len) { 501 if ((newmib = realloc(ifp->specmib, len)) == NULL) { 502 ifp->specmib = NULL; 503 ifp->specmiblen = 0; 504 goto out; 505 } 506 ifp->specmib = newmib; 507 ifp->specmiblen = len; 508 } 509 if (sysctl(name, 6, ifp->specmib, &len, NULL, 0) == -1) { 510 syslog(LOG_WARNING, "sysctl linkmib (%s): %m", ifp->name); 511 if (ifp->specmib != NULL) { 512 ifp->specmib = NULL; 513 ifp->specmiblen = 0; 514 } 515 } 516 517 out: 518 strncpy(irr.ifr_name, ifp->name, sizeof(irr.ifr_name)); 519 irr.ifr_buffer.buffer = MIBIF_PRIV(ifp)->alias; 520 irr.ifr_buffer.length = sizeof(MIBIF_PRIV(ifp)->alias); 521 if (ioctl(mib_netsock, SIOCGIFDESCR, &irr) == -1) { 522 MIBIF_PRIV(ifp)->alias[0] = 0; 523 if (errno != ENOMSG) 524 syslog(LOG_WARNING, "SIOCGIFDESCR (%s): %m", ifp->name); 525 } else if (irr.ifr_buffer.buffer == NULL) { 526 MIBIF_PRIV(ifp)->alias[0] = 0; 527 syslog(LOG_WARNING, "SIOCGIFDESCR (%s): too long (%zu)", 528 ifp->name, irr.ifr_buffer.length); 529 } 530 ifp->mibtick = get_ticks(); 531 return (0); 532 } 533 534 /* find first/next address for a given interface */ 535 struct mibifa * 536 mib_first_ififa(const struct mibif *ifp) 537 { 538 struct mibifa *ifa; 539 540 TAILQ_FOREACH(ifa, &mibifa_list, link) 541 if (ifp->index == ifa->ifindex) 542 return (ifa); 543 return (NULL); 544 } 545 546 struct mibifa * 547 mib_next_ififa(struct mibifa *ifa0) 548 { 549 struct mibifa *ifa; 550 551 ifa = ifa0; 552 while ((ifa = TAILQ_NEXT(ifa, link)) != NULL) 553 if (ifa->ifindex == ifa0->ifindex) 554 return (ifa); 555 return (NULL); 556 } 557 558 /* 559 * Allocate a new IFA 560 */ 561 static struct mibifa * 562 alloc_ifa(u_int ifindex, struct in_addr addr) 563 { 564 struct mibifa *ifa; 565 uint32_t ha; 566 567 if ((ifa = malloc(sizeof(struct mibifa))) == NULL) { 568 syslog(LOG_ERR, "ifa: %m"); 569 return (NULL); 570 } 571 ifa->inaddr = addr; 572 ifa->ifindex = ifindex; 573 574 ha = ntohl(ifa->inaddr.s_addr); 575 ifa->index.len = 4; 576 ifa->index.subs[0] = (ha >> 24) & 0xff; 577 ifa->index.subs[1] = (ha >> 16) & 0xff; 578 ifa->index.subs[2] = (ha >> 8) & 0xff; 579 ifa->index.subs[3] = (ha >> 0) & 0xff; 580 581 ifa->flags = 0; 582 ifa->inbcast.s_addr = 0; 583 ifa->inmask.s_addr = 0xffffffff; 584 585 INSERT_OBJECT_OID(ifa, &mibifa_list); 586 587 return (ifa); 588 } 589 590 /* 591 * Delete an interface address 592 */ 593 static void 594 destroy_ifa(struct mibifa *ifa) 595 { 596 TAILQ_REMOVE(&mibifa_list, ifa, link); 597 free(ifa); 598 } 599 600 601 /* 602 * Helper routine to extract the sockaddr structures from a routing 603 * socket message. 604 */ 605 void 606 mib_extract_addrs(int addrs, u_char *info, struct sockaddr **out) 607 { 608 u_int i; 609 610 for (i = 0; i < RTAX_MAX; i++) { 611 if ((addrs & (1 << i)) != 0) { 612 *out = (struct sockaddr *)(void *)info; 613 info += roundup((*out)->sa_len, sizeof(long)); 614 } else 615 *out = NULL; 616 out++; 617 } 618 } 619 620 /* 621 * save the phys address of an interface. Handle receive address entries here. 622 */ 623 static void 624 get_physaddr(struct mibif *ifp, struct sockaddr_dl *sdl, u_char *ptr) 625 { 626 u_char *np; 627 struct mibrcvaddr *rcv; 628 629 if (sdl->sdl_alen == 0) { 630 /* no address */ 631 if (ifp->physaddrlen != 0) { 632 if ((rcv = mib_find_rcvaddr(ifp->index, ifp->physaddr, 633 ifp->physaddrlen)) != NULL) 634 mib_rcvaddr_delete(rcv); 635 free(ifp->physaddr); 636 ifp->physaddr = NULL; 637 ifp->physaddrlen = 0; 638 } 639 return; 640 } 641 642 if (ifp->physaddrlen != sdl->sdl_alen) { 643 /* length changed */ 644 if (ifp->physaddrlen) { 645 /* delete olf receive address */ 646 if ((rcv = mib_find_rcvaddr(ifp->index, ifp->physaddr, 647 ifp->physaddrlen)) != NULL) 648 mib_rcvaddr_delete(rcv); 649 } 650 if ((np = realloc(ifp->physaddr, sdl->sdl_alen)) == NULL) { 651 free(ifp->physaddr); 652 ifp->physaddr = NULL; 653 ifp->physaddrlen = 0; 654 return; 655 } 656 ifp->physaddr = np; 657 ifp->physaddrlen = sdl->sdl_alen; 658 659 } else if (memcmp(ifp->physaddr, ptr, ifp->physaddrlen) == 0) { 660 /* no change */ 661 return; 662 663 } else { 664 /* address changed */ 665 666 /* delete olf receive address */ 667 if ((rcv = mib_find_rcvaddr(ifp->index, ifp->physaddr, 668 ifp->physaddrlen)) != NULL) 669 mib_rcvaddr_delete(rcv); 670 } 671 672 memcpy(ifp->physaddr, ptr, ifp->physaddrlen); 673 674 /* make new receive address */ 675 if ((rcv = mib_rcvaddr_create(ifp, ifp->physaddr, ifp->physaddrlen)) != NULL) 676 rcv->flags |= MIBRCVADDR_HW; 677 } 678 679 /* 680 * Free an interface 681 */ 682 static void 683 mibif_free(struct mibif *ifp) 684 { 685 struct mibif *ifp1; 686 struct mibindexmap *map; 687 struct mibifa *ifa, *ifa1; 688 struct mibrcvaddr *rcv, *rcv1; 689 struct mibarp *at, *at1; 690 691 if (ifp->xnotify != NULL) 692 (*ifp->xnotify)(ifp, MIBIF_NOTIFY_DESTROY, ifp->xnotify_data); 693 694 (void)mib_ifstack_delete(ifp, NULL); 695 (void)mib_ifstack_delete(NULL, ifp); 696 697 TAILQ_REMOVE(&mibif_list, ifp, link); 698 699 /* if this was the fastest interface - recompute this */ 700 if (ifp->mib.ifmd_data.ifi_baudrate == mibif_maxspeed) { 701 mibif_maxspeed = ifp->mib.ifmd_data.ifi_baudrate; 702 TAILQ_FOREACH(ifp1, &mibif_list, link) 703 if (ifp1->mib.ifmd_data.ifi_baudrate > mibif_maxspeed) 704 mibif_maxspeed = 705 ifp1->mib.ifmd_data.ifi_baudrate; 706 mibif_reset_hc_timer(); 707 } 708 709 free(ifp->private); 710 if (ifp->physaddr != NULL) 711 free(ifp->physaddr); 712 if (ifp->specmib != NULL) 713 free(ifp->specmib); 714 715 STAILQ_FOREACH(map, &mibindexmap_list, link) 716 if (map->mibif == ifp) { 717 map->mibif = NULL; 718 break; 719 } 720 721 /* purge interface addresses */ 722 ifa = TAILQ_FIRST(&mibifa_list); 723 while (ifa != NULL) { 724 ifa1 = TAILQ_NEXT(ifa, link); 725 if (ifa->ifindex == ifp->index) 726 destroy_ifa(ifa); 727 ifa = ifa1; 728 } 729 730 /* purge receive addresses */ 731 rcv = TAILQ_FIRST(&mibrcvaddr_list); 732 while (rcv != NULL) { 733 rcv1 = TAILQ_NEXT(rcv, link); 734 if (rcv->ifindex == ifp->index) 735 mib_rcvaddr_delete(rcv); 736 rcv = rcv1; 737 } 738 739 /* purge ARP entries */ 740 at = TAILQ_FIRST(&mibarp_list); 741 while (at != NULL) { 742 at1 = TAILQ_NEXT(at, link); 743 if (at->index.subs[0] == ifp->index) 744 mib_arp_delete(at); 745 at = at1; 746 } 747 748 749 free(ifp); 750 mib_if_number--; 751 mib_iftable_last_change = this_tick; 752 } 753 754 /* 755 * Create a new interface 756 */ 757 static struct mibif * 758 mibif_create(u_int sysindex, const char *name) 759 { 760 struct mibif *ifp; 761 struct mibindexmap *map; 762 763 if ((ifp = malloc(sizeof(*ifp))) == NULL) { 764 syslog(LOG_WARNING, "%s: %m", __func__); 765 return (NULL); 766 } 767 memset(ifp, 0, sizeof(*ifp)); 768 if ((ifp->private = malloc(sizeof(struct mibif_private))) == NULL) { 769 syslog(LOG_WARNING, "%s: %m", __func__); 770 free(ifp); 771 return (NULL); 772 } 773 memset(ifp->private, 0, sizeof(struct mibif_private)); 774 775 ifp->sysindex = sysindex; 776 strcpy(ifp->name, name); 777 strcpy(ifp->descr, name); 778 ifp->spec_oid = oid_zeroDotZero; 779 780 map = NULL; 781 if (!mib_if_is_dyn(ifp->name)) { 782 /* non-dynamic. look whether we know the interface */ 783 STAILQ_FOREACH(map, &mibindexmap_list, link) 784 if (strcmp(map->name, ifp->name) == 0) { 785 ifp->index = map->ifindex; 786 map->mibif = ifp; 787 break; 788 } 789 /* assume it has a connector if it is not dynamic */ 790 ifp->has_connector = 1; 791 ifp->trap_enable = 1; 792 } 793 if (map == NULL) { 794 /* new interface - get new index */ 795 if (next_if_index > 0x7fffffff) 796 errx(1, "ifindex wrap"); 797 798 if ((map = malloc(sizeof(*map))) == NULL) { 799 syslog(LOG_ERR, "ifmap: %m"); 800 free(ifp); 801 return (NULL); 802 } 803 map->ifindex = next_if_index++; 804 map->sysindex = ifp->sysindex; 805 strcpy(map->name, ifp->name); 806 map->mibif = ifp; 807 STAILQ_INSERT_TAIL(&mibindexmap_list, map, link); 808 } else { 809 /* re-instantiate. Introduce a counter discontinuity */ 810 ifp->counter_disc = get_ticks(); 811 } 812 ifp->index = map->ifindex; 813 ifp->mib.ifmd_data.ifi_link_state = LINK_STATE_UNKNOWN; 814 815 INSERT_OBJECT_INT(ifp, &mibif_list); 816 mib_if_number++; 817 mib_iftable_last_change = this_tick; 818 819 /* instantiate default ifStack entries */ 820 (void)mib_ifstack_create(ifp, NULL); 821 (void)mib_ifstack_create(NULL, ifp); 822 823 return (ifp); 824 } 825 826 /* 827 * Inform all interested parties about a new interface 828 */ 829 static void 830 notify_newif(struct mibif *ifp) 831 { 832 struct newifreg *reg; 833 834 TAILQ_FOREACH(reg, &newifreg_list, link) 835 if ((*reg->func)(ifp)) 836 return; 837 } 838 839 /* 840 * This is called for new interfaces after we have fetched the interface 841 * MIB. If this is a broadcast interface try to guess the broadcast address 842 * depending on the interface type. 843 */ 844 static void 845 check_llbcast(struct mibif *ifp) 846 { 847 static u_char ether_bcast[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 848 static u_char arcnet_bcast = 0; 849 struct mibrcvaddr *rcv; 850 851 if (!(ifp->mib.ifmd_flags & IFF_BROADCAST)) 852 return; 853 854 switch (ifp->mib.ifmd_data.ifi_type) { 855 856 case IFT_ETHER: 857 case IFT_FDDI: 858 case IFT_ISO88025: 859 case IFT_L2VLAN: 860 if (mib_find_rcvaddr(ifp->index, ether_bcast, 6) == NULL && 861 (rcv = mib_rcvaddr_create(ifp, ether_bcast, 6)) != NULL) 862 rcv->flags |= MIBRCVADDR_BCAST; 863 break; 864 865 case IFT_ARCNET: 866 if (mib_find_rcvaddr(ifp->index, &arcnet_bcast, 1) == NULL && 867 (rcv = mib_rcvaddr_create(ifp, &arcnet_bcast, 1)) != NULL) 868 rcv->flags |= MIBRCVADDR_BCAST; 869 break; 870 } 871 } 872 873 874 /* 875 * Retrieve the current interface list from the system. 876 */ 877 void 878 mib_refresh_iflist(void) 879 { 880 struct mibif *ifp, *ifp1; 881 size_t len; 882 u_short idx; 883 int name[6]; 884 int count; 885 struct ifmibdata mib; 886 887 TAILQ_FOREACH(ifp, &mibif_list, link) 888 ifp->flags &= ~MIBIF_FOUND; 889 890 len = sizeof(count); 891 if (sysctlbyname("net.link.generic.system.ifcount", &count, &len, 892 NULL, 0) == -1) { 893 syslog(LOG_ERR, "ifcount: %m"); 894 return; 895 } 896 name[0] = CTL_NET; 897 name[1] = PF_LINK; 898 name[2] = NETLINK_GENERIC; 899 name[3] = IFMIB_IFDATA; 900 name[5] = IFDATA_GENERAL; 901 for (idx = 1; idx <= count; idx++) { 902 name[4] = idx; 903 len = sizeof(mib); 904 if (sysctl(name, 6, &mib, &len, NULL, 0) == -1) { 905 if (errno == ENOENT) 906 continue; 907 syslog(LOG_ERR, "ifmib(%u): %m", idx); 908 return; 909 } 910 if ((ifp = mib_find_if_sys(idx)) != NULL) { 911 ifp->flags |= MIBIF_FOUND; 912 continue; 913 } 914 /* Unknown interface - create */ 915 if ((ifp = mibif_create(idx, mib.ifmd_name)) != NULL) { 916 ifp->flags |= MIBIF_FOUND; 917 (void)mib_fetch_ifmib(ifp); 918 check_llbcast(ifp); 919 notify_newif(ifp); 920 } 921 } 922 923 /* 924 * Purge interfaces that disappeared 925 */ 926 ifp = TAILQ_FIRST(&mibif_list); 927 while (ifp != NULL) { 928 ifp1 = TAILQ_NEXT(ifp, link); 929 if (!(ifp->flags & MIBIF_FOUND)) 930 mibif_free(ifp); 931 ifp = ifp1; 932 } 933 } 934 935 /* 936 * Find an interface address 937 */ 938 struct mibifa * 939 mib_find_ifa(struct in_addr addr) 940 { 941 struct mibifa *ifa; 942 943 TAILQ_FOREACH(ifa, &mibifa_list, link) 944 if (ifa->inaddr.s_addr == addr.s_addr) 945 return (ifa); 946 return (NULL); 947 } 948 949 /* 950 * Process a new ARP entry 951 */ 952 static void 953 process_arp(const struct rt_msghdr *rtm, const struct sockaddr_dl *sdl, 954 const struct sockaddr_in *sa) 955 { 956 struct mibif *ifp; 957 struct mibarp *at; 958 959 /* IP arp table entry */ 960 if (sdl->sdl_alen == 0) 961 return; 962 if ((ifp = mib_find_if_sys(sdl->sdl_index)) == NULL) 963 return; 964 /* have a valid entry */ 965 if ((at = mib_find_arp(ifp, sa->sin_addr)) == NULL && 966 (at = mib_arp_create(ifp, sa->sin_addr, 967 sdl->sdl_data + sdl->sdl_nlen, sdl->sdl_alen)) == NULL) 968 return; 969 970 if (rtm->rtm_rmx.rmx_expire == 0) 971 at->flags |= MIBARP_PERM; 972 else 973 at->flags &= ~MIBARP_PERM; 974 at->flags |= MIBARP_FOUND; 975 } 976 977 /* 978 * Handle a routing socket message. 979 */ 980 static void 981 handle_rtmsg(struct rt_msghdr *rtm) 982 { 983 struct sockaddr *addrs[RTAX_MAX]; 984 struct if_msghdr *ifm; 985 struct ifa_msghdr ifam; 986 struct ifma_msghdr *ifmam; 987 #ifdef RTM_IFANNOUNCE 988 struct if_announcemsghdr *ifan; 989 #endif 990 struct mibif *ifp; 991 struct sockaddr_dl *sdl; 992 struct sockaddr_in *sa; 993 struct mibifa *ifa; 994 struct mibrcvaddr *rcv; 995 u_char *ptr; 996 997 if (rtm->rtm_version != RTM_VERSION) { 998 syslog(LOG_ERR, "Bogus RTM version %u", rtm->rtm_version); 999 return; 1000 } 1001 1002 switch (rtm->rtm_type) { 1003 1004 case RTM_NEWADDR: 1005 memcpy(&ifam, rtm, sizeof(ifam)); 1006 mib_extract_addrs(ifam.ifam_addrs, (u_char *)(&ifam + 1), addrs); 1007 if (addrs[RTAX_IFA] == NULL || addrs[RTAX_NETMASK] == NULL) 1008 break; 1009 1010 sa = (struct sockaddr_in *)(void *)addrs[RTAX_IFA]; 1011 if ((ifa = mib_find_ifa(sa->sin_addr)) == NULL) { 1012 /* unknown address */ 1013 if ((ifp = mib_find_if_sys(ifam.ifam_index)) == NULL) { 1014 syslog(LOG_WARNING, "RTM_NEWADDR for unknown " 1015 "interface %u", ifam.ifam_index); 1016 break; 1017 } 1018 if ((ifa = alloc_ifa(ifp->index, sa->sin_addr)) == NULL) 1019 break; 1020 } 1021 sa = (struct sockaddr_in *)(void *)addrs[RTAX_NETMASK]; 1022 ifa->inmask = sa->sin_addr; 1023 1024 if (addrs[RTAX_BRD] != NULL) { 1025 sa = (struct sockaddr_in *)(void *)addrs[RTAX_BRD]; 1026 ifa->inbcast = sa->sin_addr; 1027 } 1028 ifa->flags |= MIBIFA_FOUND; 1029 break; 1030 1031 case RTM_DELADDR: 1032 memcpy(&ifam, rtm, sizeof(ifam)); 1033 mib_extract_addrs(ifam.ifam_addrs, (u_char *)(&ifam + 1), addrs); 1034 if (addrs[RTAX_IFA] == NULL) 1035 break; 1036 1037 sa = (struct sockaddr_in *)(void *)addrs[RTAX_IFA]; 1038 if ((ifa = mib_find_ifa(sa->sin_addr)) != NULL) { 1039 ifa->flags |= MIBIFA_FOUND; 1040 if (!(ifa->flags & MIBIFA_DESTROYED)) 1041 destroy_ifa(ifa); 1042 } 1043 break; 1044 1045 case RTM_NEWMADDR: 1046 ifmam = (struct ifma_msghdr *)rtm; 1047 mib_extract_addrs(ifmam->ifmam_addrs, (u_char *)(ifmam + 1), addrs); 1048 if (addrs[RTAX_IFA] == NULL || 1049 addrs[RTAX_IFA]->sa_family != AF_LINK) 1050 break; 1051 sdl = (struct sockaddr_dl *)(void *)addrs[RTAX_IFA]; 1052 if ((rcv = mib_find_rcvaddr(sdl->sdl_index, 1053 sdl->sdl_data + sdl->sdl_nlen, sdl->sdl_alen)) == NULL) { 1054 /* unknown address */ 1055 if ((ifp = mib_find_if_sys(sdl->sdl_index)) == NULL) { 1056 syslog(LOG_WARNING, "RTM_NEWMADDR for unknown " 1057 "interface %u", sdl->sdl_index); 1058 break; 1059 } 1060 if ((rcv = mib_rcvaddr_create(ifp, 1061 sdl->sdl_data + sdl->sdl_nlen, sdl->sdl_alen)) == NULL) 1062 break; 1063 rcv->flags |= MIBRCVADDR_VOLATILE; 1064 } 1065 rcv->flags |= MIBRCVADDR_FOUND; 1066 break; 1067 1068 case RTM_DELMADDR: 1069 ifmam = (struct ifma_msghdr *)rtm; 1070 mib_extract_addrs(ifmam->ifmam_addrs, (u_char *)(ifmam + 1), addrs); 1071 if (addrs[RTAX_IFA] == NULL || 1072 addrs[RTAX_IFA]->sa_family != AF_LINK) 1073 break; 1074 sdl = (struct sockaddr_dl *)(void *)addrs[RTAX_IFA]; 1075 if ((rcv = mib_find_rcvaddr(sdl->sdl_index, 1076 sdl->sdl_data + sdl->sdl_nlen, sdl->sdl_alen)) != NULL) 1077 mib_rcvaddr_delete(rcv); 1078 break; 1079 1080 case RTM_IFINFO: 1081 ifm = (struct if_msghdr *)(void *)rtm; 1082 mib_extract_addrs(ifm->ifm_addrs, (u_char *)(ifm + 1), addrs); 1083 if ((ifp = mib_find_if_sys(ifm->ifm_index)) == NULL) 1084 break; 1085 if (addrs[RTAX_IFP] != NULL && 1086 addrs[RTAX_IFP]->sa_family == AF_LINK) { 1087 sdl = (struct sockaddr_dl *)(void *)addrs[RTAX_IFP]; 1088 ptr = sdl->sdl_data + sdl->sdl_nlen; 1089 get_physaddr(ifp, sdl, ptr); 1090 } 1091 (void)mib_fetch_ifmib(ifp); 1092 break; 1093 1094 #ifdef RTM_IFANNOUNCE 1095 case RTM_IFANNOUNCE: 1096 ifan = (struct if_announcemsghdr *)rtm; 1097 ifp = mib_find_if_sys(ifan->ifan_index); 1098 1099 switch (ifan->ifan_what) { 1100 1101 case IFAN_ARRIVAL: 1102 if (ifp == NULL && (ifp = mibif_create(ifan->ifan_index, 1103 ifan->ifan_name)) != NULL) { 1104 (void)mib_fetch_ifmib(ifp); 1105 check_llbcast(ifp); 1106 notify_newif(ifp); 1107 } 1108 break; 1109 1110 case IFAN_DEPARTURE: 1111 if (ifp != NULL) 1112 mibif_free(ifp); 1113 break; 1114 } 1115 break; 1116 #endif 1117 case RTM_GET: 1118 case RTM_ADD: 1119 mib_extract_addrs(rtm->rtm_addrs, (u_char *)(rtm + 1), addrs); 1120 if (rtm->rtm_flags & RTF_LLINFO) { 1121 if (addrs[RTAX_DST] == NULL || 1122 addrs[RTAX_GATEWAY] == NULL || 1123 addrs[RTAX_DST]->sa_family != AF_INET || 1124 addrs[RTAX_GATEWAY]->sa_family != AF_LINK) 1125 break; 1126 process_arp(rtm, 1127 (struct sockaddr_dl *)(void *)addrs[RTAX_GATEWAY], 1128 (struct sockaddr_in *)(void *)addrs[RTAX_DST]); 1129 } else { 1130 if (rtm->rtm_errno == 0 && (rtm->rtm_flags & RTF_UP)) 1131 mib_sroute_process(rtm, addrs[RTAX_GATEWAY], 1132 addrs[RTAX_DST], addrs[RTAX_NETMASK]); 1133 } 1134 break; 1135 1136 case RTM_DELETE: 1137 mib_extract_addrs(rtm->rtm_addrs, (u_char *)(rtm + 1), addrs); 1138 1139 if (rtm->rtm_errno == 0 && (rtm->rtm_flags & RTF_UP)) 1140 mib_sroute_process(rtm, addrs[RTAX_GATEWAY], 1141 addrs[RTAX_DST], addrs[RTAX_NETMASK]); 1142 break; 1143 } 1144 } 1145 1146 /* 1147 * send a routing message 1148 */ 1149 void 1150 mib_send_rtmsg(struct rt_msghdr *rtm, struct sockaddr *gw, 1151 struct sockaddr *dst, struct sockaddr *mask) 1152 { 1153 size_t len; 1154 struct rt_msghdr *msg; 1155 char *cp; 1156 ssize_t sent; 1157 1158 len = sizeof(*rtm) + SA_SIZE(gw) + SA_SIZE(dst) + SA_SIZE(mask); 1159 if ((msg = malloc(len)) == NULL) { 1160 syslog(LOG_ERR, "%s: %m", __func__); 1161 return; 1162 } 1163 cp = (char *)(msg + 1); 1164 1165 memset(msg, 0, sizeof(*msg)); 1166 msg->rtm_flags = 0; 1167 msg->rtm_version = RTM_VERSION; 1168 msg->rtm_addrs = RTA_DST | RTA_GATEWAY; 1169 1170 memcpy(cp, dst, SA_SIZE(dst)); 1171 cp += SA_SIZE(dst); 1172 memcpy(cp, gw, SA_SIZE(gw)); 1173 cp += SA_SIZE(gw); 1174 if (mask != NULL) { 1175 memcpy(cp, mask, SA_SIZE(mask)); 1176 cp += SA_SIZE(mask); 1177 msg->rtm_addrs |= RTA_NETMASK; 1178 } 1179 msg->rtm_msglen = cp - (char *)msg; 1180 msg->rtm_type = RTM_GET; 1181 if ((sent = write(route, msg, msg->rtm_msglen)) == -1) { 1182 syslog(LOG_ERR, "%s: write: %m", __func__); 1183 free(msg); 1184 return; 1185 } 1186 if (sent != msg->rtm_msglen) { 1187 syslog(LOG_ERR, "%s: short write", __func__); 1188 free(msg); 1189 return; 1190 } 1191 free(msg); 1192 } 1193 1194 /* 1195 * Fetch the routing table via sysctl 1196 */ 1197 u_char * 1198 mib_fetch_rtab(int af, int info, int arg, size_t *lenp) 1199 { 1200 int name[6]; 1201 u_char *buf, *newbuf; 1202 1203 name[0] = CTL_NET; 1204 name[1] = PF_ROUTE; 1205 name[2] = 0; 1206 name[3] = af; 1207 name[4] = info; 1208 name[5] = arg; 1209 1210 *lenp = 0; 1211 1212 /* initial estimate */ 1213 if (sysctl(name, 6, NULL, lenp, NULL, 0) == -1) { 1214 syslog(LOG_ERR, "sysctl estimate (%d,%d,%d,%d,%d,%d): %m", 1215 name[0], name[1], name[2], name[3], name[4], name[5]); 1216 return (NULL); 1217 } 1218 if (*lenp == 0) 1219 return (NULL); 1220 1221 buf = NULL; 1222 for (;;) { 1223 if ((newbuf = realloc(buf, *lenp)) == NULL) { 1224 syslog(LOG_ERR, "sysctl buffer: %m"); 1225 free(buf); 1226 return (NULL); 1227 } 1228 buf = newbuf; 1229 1230 if (sysctl(name, 6, buf, lenp, NULL, 0) == 0) 1231 break; 1232 1233 if (errno != ENOMEM) { 1234 syslog(LOG_ERR, "sysctl get: %m"); 1235 free(buf); 1236 return (NULL); 1237 } 1238 *lenp += *lenp / 8 + 1; 1239 } 1240 1241 return (buf); 1242 } 1243 1244 /* 1245 * Update the following info: interface, interface addresses, interface 1246 * receive addresses, arp-table. 1247 * This does not change the interface list itself. 1248 */ 1249 static void 1250 update_ifa_info(void) 1251 { 1252 u_char *buf, *next; 1253 struct rt_msghdr *rtm; 1254 struct mibifa *ifa, *ifa1; 1255 struct mibrcvaddr *rcv, *rcv1; 1256 size_t needed; 1257 static const int infos[][3] = { 1258 { 0, NET_RT_IFLIST, 0 }, 1259 #ifdef NET_RT_IFMALIST 1260 { AF_LINK, NET_RT_IFMALIST, 0 }, 1261 #endif 1262 }; 1263 u_int i; 1264 1265 TAILQ_FOREACH(ifa, &mibifa_list, link) 1266 ifa->flags &= ~MIBIFA_FOUND; 1267 TAILQ_FOREACH(rcv, &mibrcvaddr_list, link) 1268 rcv->flags &= ~MIBRCVADDR_FOUND; 1269 1270 for (i = 0; i < sizeof(infos) / sizeof(infos[0]); i++) { 1271 if ((buf = mib_fetch_rtab(infos[i][0], infos[i][1], infos[i][2], 1272 &needed)) == NULL) 1273 continue; 1274 1275 next = buf; 1276 while (next < buf + needed) { 1277 rtm = (struct rt_msghdr *)(void *)next; 1278 next += rtm->rtm_msglen; 1279 handle_rtmsg(rtm); 1280 } 1281 free(buf); 1282 } 1283 1284 /* 1285 * Purge the address list of unused entries. These may happen for 1286 * interface aliases that are on the same subnet. We don't receive 1287 * routing socket messages for them. 1288 */ 1289 ifa = TAILQ_FIRST(&mibifa_list); 1290 while (ifa != NULL) { 1291 ifa1 = TAILQ_NEXT(ifa, link); 1292 if (!(ifa->flags & MIBIFA_FOUND)) 1293 destroy_ifa(ifa); 1294 ifa = ifa1; 1295 } 1296 1297 rcv = TAILQ_FIRST(&mibrcvaddr_list); 1298 while (rcv != NULL) { 1299 rcv1 = TAILQ_NEXT(rcv, link); 1300 if (!(rcv->flags & (MIBRCVADDR_FOUND | MIBRCVADDR_BCAST | 1301 MIBRCVADDR_HW))) 1302 mib_rcvaddr_delete(rcv); 1303 rcv = rcv1; 1304 } 1305 } 1306 1307 /* 1308 * Update arp table 1309 * 1310 */ 1311 void 1312 mib_arp_update(void) 1313 { 1314 struct mibarp *at, *at1; 1315 size_t needed; 1316 u_char *buf, *next; 1317 struct rt_msghdr *rtm; 1318 1319 if (in_update_arp) 1320 return; /* Aaargh */ 1321 in_update_arp = 1; 1322 1323 TAILQ_FOREACH(at, &mibarp_list, link) 1324 at->flags &= ~MIBARP_FOUND; 1325 1326 if ((buf = mib_fetch_rtab(AF_INET, NET_RT_FLAGS, 0, &needed)) == NULL) { 1327 in_update_arp = 0; 1328 return; 1329 } 1330 1331 next = buf; 1332 while (next < buf + needed) { 1333 rtm = (struct rt_msghdr *)(void *)next; 1334 next += rtm->rtm_msglen; 1335 handle_rtmsg(rtm); 1336 } 1337 free(buf); 1338 1339 at = TAILQ_FIRST(&mibarp_list); 1340 while (at != NULL) { 1341 at1 = TAILQ_NEXT(at, link); 1342 if (!(at->flags & MIBARP_FOUND)) 1343 mib_arp_delete(at); 1344 at = at1; 1345 } 1346 mibarpticks = get_ticks(); 1347 in_update_arp = 0; 1348 } 1349 1350 1351 /* 1352 * Intput on the routing socket. 1353 */ 1354 static void 1355 route_input(int fd, void *udata __unused) 1356 { 1357 u_char buf[1024 * 16]; 1358 ssize_t n; 1359 struct rt_msghdr *rtm; 1360 1361 if ((n = read(fd, buf, sizeof(buf))) == -1) 1362 err(1, "read(rt_socket)"); 1363 1364 if (n == 0) 1365 errx(1, "EOF on rt_socket"); 1366 1367 rtm = (struct rt_msghdr *)(void *)buf; 1368 if ((size_t)n != rtm->rtm_msglen) 1369 errx(1, "n=%zu, rtm_msglen=%u", (size_t)n, rtm->rtm_msglen); 1370 1371 handle_rtmsg(rtm); 1372 } 1373 1374 /* 1375 * execute and SIOCAIFADDR 1376 */ 1377 static int 1378 siocaifaddr(char *ifname, struct in_addr addr, struct in_addr mask, 1379 struct in_addr bcast) 1380 { 1381 struct ifaliasreq addreq; 1382 struct sockaddr_in *sa; 1383 1384 memset(&addreq, 0, sizeof(addreq)); 1385 strncpy(addreq.ifra_name, ifname, sizeof(addreq.ifra_name)); 1386 1387 sa = (struct sockaddr_in *)(void *)&addreq.ifra_addr; 1388 sa->sin_family = AF_INET; 1389 sa->sin_len = sizeof(*sa); 1390 sa->sin_addr = addr; 1391 1392 sa = (struct sockaddr_in *)(void *)&addreq.ifra_mask; 1393 sa->sin_family = AF_INET; 1394 sa->sin_len = sizeof(*sa); 1395 sa->sin_addr = mask; 1396 1397 sa = (struct sockaddr_in *)(void *)&addreq.ifra_broadaddr; 1398 sa->sin_family = AF_INET; 1399 sa->sin_len = sizeof(*sa); 1400 sa->sin_addr = bcast; 1401 1402 return (ioctl(mib_netsock, SIOCAIFADDR, &addreq)); 1403 } 1404 1405 /* 1406 * Exececute a SIOCDIFADDR 1407 */ 1408 static int 1409 siocdifaddr(const char *ifname, struct in_addr addr) 1410 { 1411 struct ifreq delreq; 1412 struct sockaddr_in *sa; 1413 1414 memset(&delreq, 0, sizeof(delreq)); 1415 strncpy(delreq.ifr_name, ifname, sizeof(delreq.ifr_name)); 1416 sa = (struct sockaddr_in *)(void *)&delreq.ifr_addr; 1417 sa->sin_family = AF_INET; 1418 sa->sin_len = sizeof(*sa); 1419 sa->sin_addr = addr; 1420 1421 return (ioctl(mib_netsock, SIOCDIFADDR, &delreq)); 1422 } 1423 1424 /* 1425 * Verify an interface address without fetching the entire list 1426 */ 1427 static int 1428 verify_ifa(const char *name, struct mibifa *ifa) 1429 { 1430 struct ifreq req; 1431 struct sockaddr_in *sa; 1432 1433 memset(&req, 0, sizeof(req)); 1434 strncpy(req.ifr_name, name, sizeof(req.ifr_name)); 1435 sa = (struct sockaddr_in *)(void *)&req.ifr_addr; 1436 sa->sin_family = AF_INET; 1437 sa->sin_len = sizeof(*sa); 1438 sa->sin_addr = ifa->inaddr; 1439 1440 if (ioctl(mib_netsock, SIOCGIFADDR, &req) == -1) 1441 return (-1); 1442 if (ifa->inaddr.s_addr != sa->sin_addr.s_addr) { 1443 syslog(LOG_ERR, "%s: address mismatch", __func__); 1444 return (-1); 1445 } 1446 1447 if (ioctl(mib_netsock, SIOCGIFNETMASK, &req) == -1) 1448 return (-1); 1449 if (ifa->inmask.s_addr != sa->sin_addr.s_addr) { 1450 syslog(LOG_ERR, "%s: netmask mismatch", __func__); 1451 return (-1); 1452 } 1453 return (0); 1454 } 1455 1456 /* 1457 * Restore a deleted interface address. Don't wait for the routing socket 1458 * to update us. 1459 */ 1460 void 1461 mib_undestroy_ifa(struct mibifa *ifa) 1462 { 1463 struct mibif *ifp; 1464 1465 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) 1466 /* keep it destroyed */ 1467 return; 1468 1469 if (siocaifaddr(ifp->name, ifa->inaddr, ifa->inmask, ifa->inbcast)) 1470 /* keep it destroyed */ 1471 return; 1472 1473 ifa->flags &= ~MIBIFA_DESTROYED; 1474 } 1475 1476 /* 1477 * Destroy an interface address 1478 */ 1479 int 1480 mib_destroy_ifa(struct mibifa *ifa) 1481 { 1482 struct mibif *ifp; 1483 1484 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) { 1485 /* ups. */ 1486 mib_iflist_bad = 1; 1487 return (-1); 1488 } 1489 if (siocdifaddr(ifp->name, ifa->inaddr)) { 1490 /* ups. */ 1491 syslog(LOG_ERR, "SIOCDIFADDR: %m"); 1492 mib_iflist_bad = 1; 1493 return (-1); 1494 } 1495 ifa->flags |= MIBIFA_DESTROYED; 1496 return (0); 1497 } 1498 1499 /* 1500 * Rollback the modification of an address. Don't bother to wait for 1501 * the routing socket. 1502 */ 1503 void 1504 mib_unmodify_ifa(struct mibifa *ifa) 1505 { 1506 struct mibif *ifp; 1507 1508 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) { 1509 /* ups. */ 1510 mib_iflist_bad = 1; 1511 return; 1512 } 1513 1514 if (siocaifaddr(ifp->name, ifa->inaddr, ifa->inmask, ifa->inbcast)) { 1515 /* ups. */ 1516 mib_iflist_bad = 1; 1517 return; 1518 } 1519 } 1520 1521 /* 1522 * Modify an IFA. 1523 */ 1524 int 1525 mib_modify_ifa(struct mibifa *ifa) 1526 { 1527 struct mibif *ifp; 1528 1529 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) { 1530 /* ups. */ 1531 mib_iflist_bad = 1; 1532 return (-1); 1533 } 1534 1535 if (siocaifaddr(ifp->name, ifa->inaddr, ifa->inmask, ifa->inbcast)) { 1536 /* ups. */ 1537 mib_iflist_bad = 1; 1538 return (-1); 1539 } 1540 1541 if (verify_ifa(ifp->name, ifa)) { 1542 /* ups. */ 1543 mib_iflist_bad = 1; 1544 return (-1); 1545 } 1546 1547 return (0); 1548 } 1549 1550 /* 1551 * Destroy a freshly created interface address. Don't bother to wait for 1552 * the routing socket. 1553 */ 1554 void 1555 mib_uncreate_ifa(struct mibifa *ifa) 1556 { 1557 struct mibif *ifp; 1558 1559 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) { 1560 /* ups. */ 1561 mib_iflist_bad = 1; 1562 return; 1563 } 1564 if (siocdifaddr(ifp->name, ifa->inaddr)) { 1565 /* ups. */ 1566 mib_iflist_bad = 1; 1567 return; 1568 } 1569 1570 destroy_ifa(ifa); 1571 } 1572 1573 /* 1574 * Create a new ifa and verify it 1575 */ 1576 struct mibifa * 1577 mib_create_ifa(u_int ifindex, struct in_addr addr, struct in_addr mask, 1578 struct in_addr bcast) 1579 { 1580 struct mibif *ifp; 1581 struct mibifa *ifa; 1582 1583 if ((ifp = mib_find_if(ifindex)) == NULL) 1584 return (NULL); 1585 if ((ifa = alloc_ifa(ifindex, addr)) == NULL) 1586 return (NULL); 1587 ifa->inmask = mask; 1588 ifa->inbcast = bcast; 1589 1590 if (siocaifaddr(ifp->name, ifa->inaddr, ifa->inmask, ifa->inbcast)) { 1591 syslog(LOG_ERR, "%s: %m", __func__); 1592 destroy_ifa(ifa); 1593 return (NULL); 1594 } 1595 if (verify_ifa(ifp->name, ifa)) { 1596 destroy_ifa(ifa); 1597 return (NULL); 1598 } 1599 return (ifa); 1600 } 1601 1602 /* 1603 * Get all cloning interfaces and make them dynamic. 1604 * Hah! Whe should probably do this on a periodic basis (XXX). 1605 */ 1606 static void 1607 get_cloners(void) 1608 { 1609 struct if_clonereq req; 1610 char *buf, *cp; 1611 int i; 1612 1613 memset(&req, 0, sizeof(req)); 1614 if (ioctl(mib_netsock, SIOCIFGCLONERS, &req) == -1) { 1615 syslog(LOG_ERR, "get cloners: %m"); 1616 return; 1617 } 1618 if ((buf = malloc(req.ifcr_total * IFNAMSIZ)) == NULL) { 1619 syslog(LOG_ERR, "%m"); 1620 return; 1621 } 1622 req.ifcr_count = req.ifcr_total; 1623 req.ifcr_buffer = buf; 1624 if (ioctl(mib_netsock, SIOCIFGCLONERS, &req) == -1) { 1625 syslog(LOG_ERR, "get cloners: %m"); 1626 free(buf); 1627 return; 1628 } 1629 for (cp = buf, i = 0; i < req.ifcr_total; i++, cp += IFNAMSIZ) 1630 mib_if_set_dyn(cp); 1631 free(buf); 1632 } 1633 1634 /* 1635 * Idle function 1636 */ 1637 static void 1638 mibII_idle(void *arg __unused) 1639 { 1640 struct mibifa *ifa; 1641 1642 if (mib_iflist_bad) { 1643 TAILQ_FOREACH(ifa, &mibifa_list, link) 1644 ifa->flags &= ~MIBIFA_DESTROYED; 1645 1646 /* assume, that all cloning interfaces are dynamic */ 1647 get_cloners(); 1648 1649 mib_refresh_iflist(); 1650 update_ifa_info(); 1651 mib_arp_update(); 1652 mib_iflist_bad = 0; 1653 } 1654 1655 mib_arp_update(); 1656 } 1657 1658 1659 /* 1660 * Start the module 1661 */ 1662 static void 1663 mibII_start(void) 1664 { 1665 if ((route_fd = fd_select(route, route_input, NULL, module)) == NULL) { 1666 syslog(LOG_ERR, "fd_select(route): %m"); 1667 return; 1668 } 1669 mib_refresh_iflist(); 1670 update_ifa_info(); 1671 mib_arp_update(); 1672 (void)mib_fetch_route(); 1673 mib_iftable_last_change = 0; 1674 mib_ifstack_last_change = 0; 1675 1676 ifmib_reg = or_register(&oid_ifMIB, 1677 "The MIB module to describe generic objects for network interface" 1678 " sub-layers.", module); 1679 1680 ipmib_reg = or_register(&oid_ipMIB, 1681 "The MIB module for managing IP and ICMP implementations, but " 1682 "excluding their management of IP routes.", module); 1683 1684 tcpmib_reg = or_register(&oid_tcpMIB, 1685 "The MIB module for managing TCP implementations.", module); 1686 1687 udpmib_reg = or_register(&oid_udpMIB, 1688 "The MIB module for managing UDP implementations.", module); 1689 1690 ipForward_reg = or_register(&oid_ipForward, 1691 "The MIB module for the display of CIDR multipath IP Routes.", 1692 module); 1693 1694 mibII_poll_timer = NULL; 1695 mibII_poll_ticks = MIBII_POLL_TICKS; 1696 mibif_restart_mibII_poll_timer(); 1697 } 1698 1699 /* 1700 * Initialize the module 1701 */ 1702 static int 1703 mibII_init(struct lmodule *mod, int argc __unused, char *argv[] __unused) 1704 { 1705 size_t len; 1706 1707 module = mod; 1708 1709 len = sizeof(clockinfo); 1710 if (sysctlbyname("kern.clockrate", &clockinfo, &len, NULL, 0) == -1) { 1711 syslog(LOG_ERR, "kern.clockrate: %m"); 1712 return (-1); 1713 } 1714 if (len != sizeof(clockinfo)) { 1715 syslog(LOG_ERR, "kern.clockrate: wrong size"); 1716 return (-1); 1717 } 1718 1719 if ((route = socket(PF_ROUTE, SOCK_RAW, AF_UNSPEC)) == -1) { 1720 syslog(LOG_ERR, "PF_ROUTE: %m"); 1721 return (-1); 1722 } 1723 1724 if ((mib_netsock = socket(PF_INET, SOCK_DGRAM, 0)) == -1) { 1725 syslog(LOG_ERR, "PF_INET: %m"); 1726 (void)close(route); 1727 return (-1); 1728 } 1729 (void)shutdown(mib_netsock, SHUT_RDWR); 1730 1731 /* assume, that all cloning interfaces are dynamic */ 1732 get_cloners(); 1733 1734 return (0); 1735 } 1736 1737 static int 1738 mibII_fini(void) 1739 { 1740 if (mibII_poll_timer != NULL ) { 1741 timer_stop(mibII_poll_timer); 1742 mibII_poll_timer = NULL; 1743 } 1744 1745 if (route_fd != NULL) 1746 fd_deselect(route_fd); 1747 if (route != -1) 1748 (void)close(route); 1749 if (mib_netsock != -1) 1750 (void)close(mib_netsock); 1751 /* XXX free memory */ 1752 1753 or_unregister(ipForward_reg); 1754 or_unregister(udpmib_reg); 1755 or_unregister(tcpmib_reg); 1756 or_unregister(ipmib_reg); 1757 or_unregister(ifmib_reg); 1758 1759 return (0); 1760 } 1761 1762 static void 1763 mibII_loading(const struct lmodule *mod, int loaded) 1764 { 1765 struct mibif *ifp; 1766 1767 if (loaded == 1) 1768 return; 1769 1770 TAILQ_FOREACH(ifp, &mibif_list, link) 1771 if (ifp->xnotify_mod == mod) { 1772 ifp->xnotify_mod = NULL; 1773 ifp->xnotify_data = NULL; 1774 ifp->xnotify = NULL; 1775 } 1776 1777 mib_unregister_newif(mod); 1778 } 1779 1780 const struct snmp_module config = { 1781 "This module implements the interface and ip groups.", 1782 mibII_init, 1783 mibII_fini, 1784 NULL, /* idle */ 1785 NULL, /* dump */ 1786 NULL, /* config */ 1787 mibII_start, 1788 NULL, 1789 mibII_ctree, 1790 mibII_CTREE_SIZE, 1791 mibII_loading 1792 }; 1793 1794 /* 1795 * Should have a list of these attached to each interface. 1796 */ 1797 void * 1798 mibif_notify(struct mibif *ifp, const struct lmodule *mod, 1799 mibif_notify_f func, void *data) 1800 { 1801 ifp->xnotify = func; 1802 ifp->xnotify_data = data; 1803 ifp->xnotify_mod = mod; 1804 1805 return (ifp); 1806 } 1807 1808 void 1809 mibif_unnotify(void *arg) 1810 { 1811 struct mibif *ifp = arg; 1812 1813 ifp->xnotify = NULL; 1814 ifp->xnotify_data = NULL; 1815 ifp->xnotify_mod = NULL; 1816 } 1817