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