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 static int kmib[2] = { -1, 0 }; /* for sysctl net.ifdescr_maxlen */ 443 444 int name[6]; 445 size_t kmiblen = nitems(kmib); 446 size_t len; 447 void *newmib; 448 struct ifmibdata oldmib = ifp->mib; 449 struct ifreq irr; 450 unsigned int alias_maxlen = MIBIF_ALIAS_SIZE_MAX; 451 452 if (fetch_generic_mib(ifp, &oldmib) == -1) 453 return (-1); 454 455 /* 456 * Quoting RFC2863, 3.1.15: "... LinkUp and linkDown traps are 457 * generated just after ifOperStatus leaves, or just before it 458 * enters, the down state, respectively;" 459 */ 460 if (ifp->trap_enable && ifp->mib.ifmd_data.ifi_link_state != 461 oldmib.ifmd_data.ifi_link_state && 462 (ifp->mib.ifmd_data.ifi_link_state == LINK_STATE_DOWN || 463 oldmib.ifmd_data.ifi_link_state == LINK_STATE_DOWN)) 464 link_trap(ifp, ifp->mib.ifmd_data.ifi_link_state == 465 LINK_STATE_UP ? 1 : 0); 466 467 ifp->flags &= ~(MIBIF_HIGHSPEED | MIBIF_VERYHIGHSPEED); 468 if (ifp->mib.ifmd_data.ifi_baudrate > 20000000) { 469 ifp->flags |= MIBIF_HIGHSPEED; 470 if (ifp->mib.ifmd_data.ifi_baudrate > 650000000) 471 ifp->flags |= MIBIF_VERYHIGHSPEED; 472 } 473 if (ifp->mib.ifmd_data.ifi_baudrate > mibif_maxspeed) { 474 mibif_maxspeed = ifp->mib.ifmd_data.ifi_baudrate; 475 mibif_reset_hc_timer(); 476 } 477 478 /* 479 * linkspecific MIB 480 */ 481 name[0] = CTL_NET; 482 name[1] = PF_LINK; 483 name[2] = NETLINK_GENERIC; 484 name[3] = IFMIB_IFDATA; 485 name[4] = ifp->sysindex; 486 name[5] = IFDATA_LINKSPECIFIC; 487 if (sysctl(name, nitems(name), NULL, &len, NULL, 0) == -1) { 488 syslog(LOG_WARNING, "sysctl linkmib estimate (%s): %m", 489 ifp->name); 490 if (ifp->specmib != NULL) { 491 ifp->specmib = NULL; 492 ifp->specmiblen = 0; 493 } 494 goto out; 495 } 496 if (len == 0) { 497 if (ifp->specmib != NULL) { 498 ifp->specmib = NULL; 499 ifp->specmiblen = 0; 500 } 501 goto out; 502 } 503 504 if (ifp->specmiblen != len) { 505 if ((newmib = realloc(ifp->specmib, len)) == NULL) { 506 ifp->specmib = NULL; 507 ifp->specmiblen = 0; 508 goto out; 509 } 510 ifp->specmib = newmib; 511 ifp->specmiblen = len; 512 } 513 if (sysctl(name, nitems(name), ifp->specmib, &len, NULL, 0) == -1) { 514 syslog(LOG_WARNING, "sysctl linkmib (%s): %m", ifp->name); 515 if (ifp->specmib != NULL) { 516 ifp->specmib = NULL; 517 ifp->specmiblen = 0; 518 } 519 } 520 521 out: 522 523 /* 524 * Find sysctl mib for net.ifdescr_maxlen (one time). 525 * kmib[0] == -1 at first call to mib_fetch_ifmib(). 526 * Then kmib[0] > 0 if we found sysctl mib for net.ifdescr_maxlen. 527 * Else, kmib[0] == 0 (unexpected error from a kernel). 528 */ 529 if (kmib[0] < 0 && 530 sysctlnametomib("net.ifdescr_maxlen", kmib, &kmiblen) < 0) { 531 kmib[0] = 0; 532 syslog(LOG_WARNING, "sysctlnametomib net.ifdescr_maxlen: %m"); 533 } 534 535 /* 536 * Fetch net.ifdescr_maxlen value every time to catch up with changes. 537 */ 538 len = sizeof(alias_maxlen); 539 if (kmib[0] > 0 && sysctl(kmib, 2, &alias_maxlen, &len, NULL, 0) < 0) { 540 /* unexpected error from the kernel, use default value */ 541 alias_maxlen = MIBIF_ALIAS_SIZE_MAX; 542 syslog(LOG_WARNING, "sysctl net.ifdescr_maxlen: %m"); 543 } 544 545 /* 546 * Kernel limit might be decreased after interfaces got 547 * their descriptions assigned. Try to obtain them anyway. 548 */ 549 if (alias_maxlen == 0) 550 alias_maxlen = MIBIF_ALIAS_SIZE_MAX; 551 552 /* 553 * Allocate maximum memory for a buffer and later reallocate 554 * to free extra memory. 555 */ 556 if ((ifp->alias = malloc(alias_maxlen)) == NULL) { 557 syslog(LOG_WARNING, "malloc(%d) failed: %m", (int)alias_maxlen); 558 goto fin; 559 } 560 561 strlcpy(irr.ifr_name, ifp->name, sizeof(irr.ifr_name)); 562 irr.ifr_buffer.buffer = ifp->alias; 563 irr.ifr_buffer.length = alias_maxlen; 564 if (ioctl(mib_netsock, SIOCGIFDESCR, &irr) == -1) { 565 free(ifp->alias); 566 ifp->alias = NULL; 567 if (errno != ENOMSG) 568 syslog(LOG_WARNING, "SIOCGIFDESCR (%s): %m", ifp->name); 569 } else if (irr.ifr_buffer.buffer == NULL) { 570 free(ifp->alias); 571 ifp->alias = NULL; 572 syslog(LOG_WARNING, "SIOCGIFDESCR (%s): too long (%zu)", 573 ifp->name, irr.ifr_buffer.length); 574 } else { 575 ifp->alias_size = strnlen(ifp->alias, alias_maxlen) + 1; 576 577 if (ifp->alias_size > MIBIF_ALIAS_SIZE) 578 ifp->alias_size = MIBIF_ALIAS_SIZE; 579 580 if (ifp->alias_size < alias_maxlen) 581 ifp->alias = realloc(ifp->alias, ifp->alias_size); 582 } 583 584 fin: 585 ifp->mibtick = get_ticks(); 586 return (0); 587 } 588 589 /* find first/next address for a given interface */ 590 struct mibifa * 591 mib_first_ififa(const struct mibif *ifp) 592 { 593 struct mibifa *ifa; 594 595 TAILQ_FOREACH(ifa, &mibifa_list, link) 596 if (ifp->index == ifa->ifindex) 597 return (ifa); 598 return (NULL); 599 } 600 601 struct mibifa * 602 mib_next_ififa(struct mibifa *ifa0) 603 { 604 struct mibifa *ifa; 605 606 ifa = ifa0; 607 while ((ifa = TAILQ_NEXT(ifa, link)) != NULL) 608 if (ifa->ifindex == ifa0->ifindex) 609 return (ifa); 610 return (NULL); 611 } 612 613 /* 614 * Allocate a new IFA 615 */ 616 static struct mibifa * 617 alloc_ifa(u_int ifindex, struct in_addr addr) 618 { 619 struct mibifa *ifa; 620 uint32_t ha; 621 622 if ((ifa = malloc(sizeof(struct mibifa))) == NULL) { 623 syslog(LOG_ERR, "ifa: %m"); 624 return (NULL); 625 } 626 ifa->inaddr = addr; 627 ifa->ifindex = ifindex; 628 629 ha = ntohl(ifa->inaddr.s_addr); 630 ifa->index.len = 4; 631 ifa->index.subs[0] = (ha >> 24) & 0xff; 632 ifa->index.subs[1] = (ha >> 16) & 0xff; 633 ifa->index.subs[2] = (ha >> 8) & 0xff; 634 ifa->index.subs[3] = (ha >> 0) & 0xff; 635 636 ifa->flags = 0; 637 ifa->inbcast.s_addr = 0; 638 ifa->inmask.s_addr = 0xffffffff; 639 640 INSERT_OBJECT_OID(ifa, &mibifa_list); 641 642 return (ifa); 643 } 644 645 /* 646 * Delete an interface address 647 */ 648 static void 649 destroy_ifa(struct mibifa *ifa) 650 { 651 TAILQ_REMOVE(&mibifa_list, ifa, link); 652 free(ifa); 653 } 654 655 656 /* 657 * Helper routine to extract the sockaddr structures from a routing 658 * socket message. 659 */ 660 void 661 mib_extract_addrs(int addrs, u_char *info, struct sockaddr **out) 662 { 663 u_int i; 664 665 for (i = 0; i < RTAX_MAX; i++) { 666 if ((addrs & (1 << i)) != 0) { 667 *out = (struct sockaddr *)(void *)info; 668 info += roundup((*out)->sa_len, sizeof(long)); 669 } else 670 *out = NULL; 671 out++; 672 } 673 } 674 675 /* 676 * save the phys address of an interface. Handle receive address entries here. 677 */ 678 static void 679 get_physaddr(struct mibif *ifp, struct sockaddr_dl *sdl, u_char *ptr) 680 { 681 u_char *np; 682 struct mibrcvaddr *rcv; 683 684 if (sdl->sdl_alen == 0) { 685 /* no address */ 686 if (ifp->physaddrlen != 0) { 687 if ((rcv = mib_find_rcvaddr(ifp->index, ifp->physaddr, 688 ifp->physaddrlen)) != NULL) 689 mib_rcvaddr_delete(rcv); 690 free(ifp->physaddr); 691 ifp->physaddr = NULL; 692 ifp->physaddrlen = 0; 693 } 694 return; 695 } 696 697 if (ifp->physaddrlen != sdl->sdl_alen) { 698 /* length changed */ 699 if (ifp->physaddrlen) { 700 /* delete olf receive address */ 701 if ((rcv = mib_find_rcvaddr(ifp->index, ifp->physaddr, 702 ifp->physaddrlen)) != NULL) 703 mib_rcvaddr_delete(rcv); 704 } 705 if ((np = realloc(ifp->physaddr, sdl->sdl_alen)) == NULL) { 706 free(ifp->physaddr); 707 ifp->physaddr = NULL; 708 ifp->physaddrlen = 0; 709 return; 710 } 711 ifp->physaddr = np; 712 ifp->physaddrlen = sdl->sdl_alen; 713 714 } else if (memcmp(ifp->physaddr, ptr, ifp->physaddrlen) == 0) { 715 /* no change */ 716 return; 717 718 } else { 719 /* address changed */ 720 721 /* delete olf receive address */ 722 if ((rcv = mib_find_rcvaddr(ifp->index, ifp->physaddr, 723 ifp->physaddrlen)) != NULL) 724 mib_rcvaddr_delete(rcv); 725 } 726 727 memcpy(ifp->physaddr, ptr, ifp->physaddrlen); 728 729 /* make new receive address */ 730 if ((rcv = mib_rcvaddr_create(ifp, ifp->physaddr, ifp->physaddrlen)) != NULL) 731 rcv->flags |= MIBRCVADDR_HW; 732 } 733 734 /* 735 * Free an interface 736 */ 737 static void 738 mibif_free(struct mibif *ifp) 739 { 740 struct mibif *ifp1; 741 struct mibindexmap *map; 742 struct mibifa *ifa, *ifa1; 743 struct mibrcvaddr *rcv, *rcv1; 744 struct mibarp *at, *at1; 745 746 if (ifp->xnotify != NULL) 747 (*ifp->xnotify)(ifp, MIBIF_NOTIFY_DESTROY, ifp->xnotify_data); 748 749 (void)mib_ifstack_delete(ifp, NULL); 750 (void)mib_ifstack_delete(NULL, ifp); 751 752 TAILQ_REMOVE(&mibif_list, ifp, link); 753 754 /* if this was the fastest interface - recompute this */ 755 if (ifp->mib.ifmd_data.ifi_baudrate == mibif_maxspeed) { 756 mibif_maxspeed = ifp->mib.ifmd_data.ifi_baudrate; 757 TAILQ_FOREACH(ifp1, &mibif_list, link) 758 if (ifp1->mib.ifmd_data.ifi_baudrate > mibif_maxspeed) 759 mibif_maxspeed = 760 ifp1->mib.ifmd_data.ifi_baudrate; 761 mibif_reset_hc_timer(); 762 } 763 764 if (ifp->alias != NULL) { 765 free(ifp->alias); 766 ifp->alias = NULL; 767 } 768 free(ifp->private); 769 ifp->private = NULL; 770 free(ifp->physaddr); 771 ifp->physaddr = NULL; 772 free(ifp->specmib); 773 ifp->specmib = NULL; 774 775 STAILQ_FOREACH(map, &mibindexmap_list, link) 776 if (map->mibif == ifp) { 777 map->mibif = NULL; 778 break; 779 } 780 781 /* purge interface addresses */ 782 ifa = TAILQ_FIRST(&mibifa_list); 783 while (ifa != NULL) { 784 ifa1 = TAILQ_NEXT(ifa, link); 785 if (ifa->ifindex == ifp->index) 786 destroy_ifa(ifa); 787 ifa = ifa1; 788 } 789 790 /* purge receive addresses */ 791 rcv = TAILQ_FIRST(&mibrcvaddr_list); 792 while (rcv != NULL) { 793 rcv1 = TAILQ_NEXT(rcv, link); 794 if (rcv->ifindex == ifp->index) 795 mib_rcvaddr_delete(rcv); 796 rcv = rcv1; 797 } 798 799 /* purge ARP entries */ 800 at = TAILQ_FIRST(&mibarp_list); 801 while (at != NULL) { 802 at1 = TAILQ_NEXT(at, link); 803 if (at->index.subs[0] == ifp->index) 804 mib_arp_delete(at); 805 at = at1; 806 } 807 808 free(ifp); 809 ifp = NULL; 810 mib_if_number--; 811 mib_iftable_last_change = this_tick; 812 } 813 814 /* 815 * Create a new interface 816 */ 817 static struct mibif * 818 mibif_create(u_int sysindex, const char *name) 819 { 820 struct mibif *ifp; 821 struct mibindexmap *map; 822 823 if ((ifp = malloc(sizeof(*ifp))) == NULL) { 824 syslog(LOG_WARNING, "%s: %m", __func__); 825 return (NULL); 826 } 827 memset(ifp, 0, sizeof(*ifp)); 828 if ((ifp->private = malloc(sizeof(struct mibif_private))) == NULL) { 829 syslog(LOG_WARNING, "%s: %m", __func__); 830 free(ifp); 831 return (NULL); 832 } 833 memset(ifp->private, 0, sizeof(struct mibif_private)); 834 835 ifp->sysindex = sysindex; 836 strlcpy(ifp->name, name, sizeof(ifp->name)); 837 strlcpy(ifp->descr, name, sizeof(ifp->descr)); 838 ifp->spec_oid = oid_zeroDotZero; 839 840 map = NULL; 841 if (!mib_if_is_dyn(ifp->name)) { 842 /* non-dynamic. look whether we know the interface */ 843 STAILQ_FOREACH(map, &mibindexmap_list, link) 844 if (strcmp(map->name, ifp->name) == 0) { 845 ifp->index = map->ifindex; 846 map->mibif = ifp; 847 break; 848 } 849 /* assume it has a connector if it is not dynamic */ 850 ifp->has_connector = 1; 851 ifp->trap_enable = 1; 852 } 853 if (map == NULL) { 854 /* new interface - get new index */ 855 if (next_if_index > 0x7fffffff) 856 errx(1, "ifindex wrap"); 857 858 if ((map = malloc(sizeof(*map))) == NULL) { 859 syslog(LOG_ERR, "ifmap: %m"); 860 free(ifp); 861 return (NULL); 862 } 863 map->ifindex = next_if_index++; 864 map->sysindex = ifp->sysindex; 865 strcpy(map->name, ifp->name); 866 map->mibif = ifp; 867 STAILQ_INSERT_TAIL(&mibindexmap_list, map, link); 868 } else { 869 /* re-instantiate. Introduce a counter discontinuity */ 870 ifp->counter_disc = get_ticks(); 871 } 872 ifp->index = map->ifindex; 873 ifp->mib.ifmd_data.ifi_link_state = LINK_STATE_UNKNOWN; 874 875 INSERT_OBJECT_INT(ifp, &mibif_list); 876 mib_if_number++; 877 mib_iftable_last_change = this_tick; 878 879 /* instantiate default ifStack entries */ 880 (void)mib_ifstack_create(ifp, NULL); 881 (void)mib_ifstack_create(NULL, ifp); 882 883 return (ifp); 884 } 885 886 /* 887 * Inform all interested parties about a new interface 888 */ 889 static void 890 notify_newif(struct mibif *ifp) 891 { 892 struct newifreg *reg; 893 894 TAILQ_FOREACH(reg, &newifreg_list, link) 895 if ((*reg->func)(ifp)) 896 return; 897 } 898 899 /* 900 * This is called for new interfaces after we have fetched the interface 901 * MIB. If this is a broadcast interface try to guess the broadcast address 902 * depending on the interface type. 903 */ 904 static void 905 check_llbcast(struct mibif *ifp) 906 { 907 static u_char ether_bcast[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 908 struct mibrcvaddr *rcv; 909 910 if (!(ifp->mib.ifmd_flags & IFF_BROADCAST)) 911 return; 912 913 switch (ifp->mib.ifmd_data.ifi_type) { 914 915 case IFT_ETHER: 916 case IFT_FDDI: 917 case IFT_ISO88025: 918 case IFT_L2VLAN: 919 if (mib_find_rcvaddr(ifp->index, ether_bcast, 6) == NULL && 920 (rcv = mib_rcvaddr_create(ifp, ether_bcast, 6)) != NULL) 921 rcv->flags |= MIBRCVADDR_BCAST; 922 break; 923 } 924 } 925 926 927 /* 928 * Retrieve the current interface list from the system. 929 */ 930 void 931 mib_refresh_iflist(void) 932 { 933 struct mibif *ifp, *ifp1; 934 size_t len; 935 u_short idx; 936 int name[6]; 937 int count; 938 struct ifmibdata mib; 939 940 TAILQ_FOREACH(ifp, &mibif_list, link) 941 ifp->flags &= ~MIBIF_FOUND; 942 943 len = sizeof(count); 944 if (sysctlbyname("net.link.generic.system.ifcount", &count, &len, 945 NULL, 0) == -1) { 946 syslog(LOG_ERR, "ifcount: %m"); 947 return; 948 } 949 name[0] = CTL_NET; 950 name[1] = PF_LINK; 951 name[2] = NETLINK_GENERIC; 952 name[3] = IFMIB_IFDATA; 953 name[5] = IFDATA_GENERAL; 954 for (idx = 1; idx <= count; idx++) { 955 name[4] = idx; 956 len = sizeof(mib); 957 if (sysctl(name, nitems(name), &mib, &len, NULL, 0) == -1) { 958 if (errno == ENOENT) 959 continue; 960 syslog(LOG_ERR, "ifmib(%u): %m", idx); 961 return; 962 } 963 if ((ifp = mib_find_if_sys(idx)) != NULL) { 964 ifp->flags |= MIBIF_FOUND; 965 continue; 966 } 967 /* Unknown interface - create */ 968 if ((ifp = mibif_create(idx, mib.ifmd_name)) != NULL) { 969 ifp->flags |= MIBIF_FOUND; 970 (void)mib_fetch_ifmib(ifp); 971 check_llbcast(ifp); 972 notify_newif(ifp); 973 } 974 } 975 976 /* 977 * Purge interfaces that disappeared 978 */ 979 ifp = TAILQ_FIRST(&mibif_list); 980 while (ifp != NULL) { 981 ifp1 = TAILQ_NEXT(ifp, link); 982 if (!(ifp->flags & MIBIF_FOUND)) 983 mibif_free(ifp); 984 ifp = ifp1; 985 } 986 } 987 988 /* 989 * Find an interface address 990 */ 991 struct mibifa * 992 mib_find_ifa(struct in_addr addr) 993 { 994 struct mibifa *ifa; 995 996 TAILQ_FOREACH(ifa, &mibifa_list, link) 997 if (ifa->inaddr.s_addr == addr.s_addr) 998 return (ifa); 999 return (NULL); 1000 } 1001 1002 /* 1003 * Process a new ARP entry 1004 */ 1005 static void 1006 process_arp(const struct rt_msghdr *rtm, const struct sockaddr_dl *sdl, 1007 const struct sockaddr_in *sa) 1008 { 1009 struct mibif *ifp; 1010 struct mibarp *at; 1011 1012 /* IP arp table entry */ 1013 if (sdl->sdl_alen == 0) 1014 return; 1015 if ((ifp = mib_find_if_sys(sdl->sdl_index)) == NULL) 1016 return; 1017 /* have a valid entry */ 1018 if ((at = mib_find_arp(ifp, sa->sin_addr)) == NULL && 1019 (at = mib_arp_create(ifp, sa->sin_addr, 1020 sdl->sdl_data + sdl->sdl_nlen, sdl->sdl_alen)) == NULL) 1021 return; 1022 1023 if (rtm->rtm_rmx.rmx_expire == 0) 1024 at->flags |= MIBARP_PERM; 1025 else 1026 at->flags &= ~MIBARP_PERM; 1027 at->flags |= MIBARP_FOUND; 1028 } 1029 1030 /* 1031 * Handle a routing socket message. 1032 */ 1033 static void 1034 handle_rtmsg(struct rt_msghdr *rtm) 1035 { 1036 struct sockaddr *addrs[RTAX_MAX]; 1037 struct if_msghdr *ifm; 1038 struct ifa_msghdr ifam, *ifamp; 1039 struct ifma_msghdr *ifmam; 1040 #ifdef RTM_IFANNOUNCE 1041 struct if_announcemsghdr *ifan; 1042 #endif 1043 struct mibif *ifp; 1044 struct sockaddr_dl *sdl; 1045 struct sockaddr_in *sa; 1046 struct mibifa *ifa; 1047 struct mibrcvaddr *rcv; 1048 u_char *ptr; 1049 1050 if (rtm->rtm_version != RTM_VERSION) { 1051 syslog(LOG_ERR, "Bogus RTM version %u", rtm->rtm_version); 1052 return; 1053 } 1054 1055 switch (rtm->rtm_type) { 1056 1057 case RTM_NEWADDR: 1058 ifamp = (struct ifa_msghdr *)rtm; 1059 memcpy(&ifam, ifamp, sizeof(ifam)); 1060 mib_extract_addrs(ifam.ifam_addrs, (u_char *)(ifamp + 1), addrs); 1061 if (addrs[RTAX_IFA] == NULL || addrs[RTAX_NETMASK] == NULL) 1062 break; 1063 1064 sa = (struct sockaddr_in *)(void *)addrs[RTAX_IFA]; 1065 if ((ifa = mib_find_ifa(sa->sin_addr)) == NULL) { 1066 /* unknown address */ 1067 if ((ifp = mib_find_if_sys(ifam.ifam_index)) == NULL) { 1068 syslog(LOG_WARNING, "RTM_NEWADDR for unknown " 1069 "interface %u", ifam.ifam_index); 1070 break; 1071 } 1072 if ((ifa = alloc_ifa(ifp->index, sa->sin_addr)) == NULL) 1073 break; 1074 } 1075 sa = (struct sockaddr_in *)(void *)addrs[RTAX_NETMASK]; 1076 ifa->inmask = sa->sin_addr; 1077 1078 if (addrs[RTAX_BRD] != NULL) { 1079 sa = (struct sockaddr_in *)(void *)addrs[RTAX_BRD]; 1080 ifa->inbcast = sa->sin_addr; 1081 } 1082 ifa->flags |= MIBIFA_FOUND; 1083 break; 1084 1085 case RTM_DELADDR: 1086 ifamp = (struct ifa_msghdr *)rtm; 1087 memcpy(&ifam, ifamp, sizeof(ifam)); 1088 mib_extract_addrs(ifam.ifam_addrs, (u_char *)(ifamp + 1), addrs); 1089 if (addrs[RTAX_IFA] == NULL) 1090 break; 1091 1092 sa = (struct sockaddr_in *)(void *)addrs[RTAX_IFA]; 1093 if ((ifa = mib_find_ifa(sa->sin_addr)) != NULL) { 1094 ifa->flags |= MIBIFA_FOUND; 1095 if (!(ifa->flags & MIBIFA_DESTROYED)) 1096 destroy_ifa(ifa); 1097 } 1098 break; 1099 1100 case RTM_NEWMADDR: 1101 ifmam = (struct ifma_msghdr *)rtm; 1102 mib_extract_addrs(ifmam->ifmam_addrs, (u_char *)(ifmam + 1), addrs); 1103 if (addrs[RTAX_IFA] == NULL || 1104 addrs[RTAX_IFA]->sa_family != AF_LINK) 1105 break; 1106 sdl = (struct sockaddr_dl *)(void *)addrs[RTAX_IFA]; 1107 if ((rcv = mib_find_rcvaddr(sdl->sdl_index, 1108 sdl->sdl_data + sdl->sdl_nlen, sdl->sdl_alen)) == NULL) { 1109 /* unknown address */ 1110 if ((ifp = mib_find_if_sys(sdl->sdl_index)) == NULL) { 1111 syslog(LOG_WARNING, "RTM_NEWMADDR for unknown " 1112 "interface %u", sdl->sdl_index); 1113 break; 1114 } 1115 if ((rcv = mib_rcvaddr_create(ifp, 1116 sdl->sdl_data + sdl->sdl_nlen, sdl->sdl_alen)) == NULL) 1117 break; 1118 rcv->flags |= MIBRCVADDR_VOLATILE; 1119 } 1120 rcv->flags |= MIBRCVADDR_FOUND; 1121 break; 1122 1123 case RTM_DELMADDR: 1124 ifmam = (struct ifma_msghdr *)rtm; 1125 mib_extract_addrs(ifmam->ifmam_addrs, (u_char *)(ifmam + 1), addrs); 1126 if (addrs[RTAX_IFA] == NULL || 1127 addrs[RTAX_IFA]->sa_family != AF_LINK) 1128 break; 1129 sdl = (struct sockaddr_dl *)(void *)addrs[RTAX_IFA]; 1130 if ((rcv = mib_find_rcvaddr(sdl->sdl_index, 1131 sdl->sdl_data + sdl->sdl_nlen, sdl->sdl_alen)) != NULL) 1132 mib_rcvaddr_delete(rcv); 1133 break; 1134 1135 case RTM_IFINFO: 1136 ifm = (struct if_msghdr *)(void *)rtm; 1137 mib_extract_addrs(ifm->ifm_addrs, (u_char *)(ifm + 1), addrs); 1138 if ((ifp = mib_find_if_sys(ifm->ifm_index)) == NULL) 1139 break; 1140 if (addrs[RTAX_IFP] != NULL && 1141 addrs[RTAX_IFP]->sa_family == AF_LINK) { 1142 sdl = (struct sockaddr_dl *)(void *)addrs[RTAX_IFP]; 1143 ptr = sdl->sdl_data + sdl->sdl_nlen; 1144 get_physaddr(ifp, sdl, ptr); 1145 } 1146 (void)mib_fetch_ifmib(ifp); 1147 break; 1148 1149 #ifdef RTM_IFANNOUNCE 1150 case RTM_IFANNOUNCE: 1151 ifan = (struct if_announcemsghdr *)rtm; 1152 ifp = mib_find_if_sys(ifan->ifan_index); 1153 1154 switch (ifan->ifan_what) { 1155 1156 case IFAN_ARRIVAL: 1157 if (ifp == NULL && (ifp = mibif_create(ifan->ifan_index, 1158 ifan->ifan_name)) != NULL) { 1159 (void)mib_fetch_ifmib(ifp); 1160 check_llbcast(ifp); 1161 notify_newif(ifp); 1162 } 1163 break; 1164 1165 case IFAN_DEPARTURE: 1166 if (ifp != NULL) 1167 mibif_free(ifp); 1168 break; 1169 } 1170 break; 1171 #endif 1172 case RTM_GET: 1173 case RTM_ADD: 1174 mib_extract_addrs(rtm->rtm_addrs, (u_char *)(rtm + 1), addrs); 1175 if (rtm->rtm_flags & RTF_LLINFO) { 1176 if (addrs[RTAX_DST] == NULL || 1177 addrs[RTAX_GATEWAY] == NULL || 1178 addrs[RTAX_DST]->sa_family != AF_INET || 1179 addrs[RTAX_GATEWAY]->sa_family != AF_LINK) 1180 break; 1181 process_arp(rtm, 1182 (struct sockaddr_dl *)(void *)addrs[RTAX_GATEWAY], 1183 (struct sockaddr_in *)(void *)addrs[RTAX_DST]); 1184 } else { 1185 if (rtm->rtm_errno == 0 && (rtm->rtm_flags & RTF_UP)) 1186 mib_sroute_process(rtm, addrs[RTAX_GATEWAY], 1187 addrs[RTAX_DST], addrs[RTAX_NETMASK]); 1188 } 1189 break; 1190 1191 case RTM_DELETE: 1192 mib_extract_addrs(rtm->rtm_addrs, (u_char *)(rtm + 1), addrs); 1193 1194 if (rtm->rtm_errno == 0 && (rtm->rtm_flags & RTF_UP)) 1195 mib_sroute_process(rtm, addrs[RTAX_GATEWAY], 1196 addrs[RTAX_DST], addrs[RTAX_NETMASK]); 1197 break; 1198 } 1199 } 1200 1201 /* 1202 * send a routing message 1203 */ 1204 void 1205 mib_send_rtmsg(struct rt_msghdr *rtm, struct sockaddr *gw, 1206 struct sockaddr *dst, struct sockaddr *mask) 1207 { 1208 size_t len; 1209 struct rt_msghdr *msg; 1210 char *cp; 1211 ssize_t sent; 1212 1213 len = sizeof(*rtm) + SA_SIZE(gw) + SA_SIZE(dst) + SA_SIZE(mask); 1214 if ((msg = malloc(len)) == NULL) { 1215 syslog(LOG_ERR, "%s: %m", __func__); 1216 return; 1217 } 1218 cp = (char *)(msg + 1); 1219 1220 memset(msg, 0, sizeof(*msg)); 1221 msg->rtm_flags = 0; 1222 msg->rtm_version = RTM_VERSION; 1223 msg->rtm_addrs = RTA_DST | RTA_GATEWAY; 1224 1225 memcpy(cp, dst, SA_SIZE(dst)); 1226 cp += SA_SIZE(dst); 1227 memcpy(cp, gw, SA_SIZE(gw)); 1228 cp += SA_SIZE(gw); 1229 if (mask != NULL) { 1230 memcpy(cp, mask, SA_SIZE(mask)); 1231 cp += SA_SIZE(mask); 1232 msg->rtm_addrs |= RTA_NETMASK; 1233 } 1234 msg->rtm_msglen = cp - (char *)msg; 1235 msg->rtm_type = RTM_GET; 1236 if ((sent = write(route, msg, msg->rtm_msglen)) == -1) { 1237 syslog(LOG_ERR, "%s: write: %m", __func__); 1238 free(msg); 1239 return; 1240 } 1241 if (sent != msg->rtm_msglen) { 1242 syslog(LOG_ERR, "%s: short write", __func__); 1243 free(msg); 1244 return; 1245 } 1246 free(msg); 1247 } 1248 1249 /* 1250 * Fetch the routing table via sysctl 1251 */ 1252 u_char * 1253 mib_fetch_rtab(int af, int info, int arg, size_t *lenp) 1254 { 1255 int name[6]; 1256 u_char *buf, *newbuf; 1257 1258 name[0] = CTL_NET; 1259 name[1] = PF_ROUTE; 1260 name[2] = 0; 1261 name[3] = af; 1262 name[4] = info; 1263 name[5] = arg; 1264 1265 *lenp = 0; 1266 1267 /* initial estimate */ 1268 if (sysctl(name, nitems(name), NULL, lenp, NULL, 0) == -1) { 1269 syslog(LOG_ERR, "sysctl estimate (%d,%d,%d,%d,%d,%d): %m", 1270 name[0], name[1], name[2], name[3], name[4], name[5]); 1271 return (NULL); 1272 } 1273 if (*lenp == 0) 1274 return (NULL); 1275 1276 buf = NULL; 1277 for (;;) { 1278 if ((newbuf = realloc(buf, *lenp)) == NULL) { 1279 syslog(LOG_ERR, "sysctl buffer: %m"); 1280 free(buf); 1281 return (NULL); 1282 } 1283 buf = newbuf; 1284 1285 if (sysctl(name, nitems(name), buf, lenp, NULL, 0) == 0) 1286 break; 1287 1288 if (errno != ENOMEM) { 1289 syslog(LOG_ERR, "sysctl get: %m"); 1290 free(buf); 1291 return (NULL); 1292 } 1293 *lenp += *lenp / 8 + 1; 1294 } 1295 1296 return (buf); 1297 } 1298 1299 /* 1300 * Update the following info: interface, interface addresses, interface 1301 * receive addresses, arp-table. 1302 * This does not change the interface list itself. 1303 */ 1304 static void 1305 update_ifa_info(void) 1306 { 1307 u_char *buf, *next; 1308 struct rt_msghdr *rtm; 1309 struct mibifa *ifa, *ifa1; 1310 struct mibrcvaddr *rcv, *rcv1; 1311 size_t needed; 1312 static const int infos[][3] = { 1313 { 0, NET_RT_IFLIST, 0 }, 1314 #ifdef NET_RT_IFMALIST 1315 { AF_LINK, NET_RT_IFMALIST, 0 }, 1316 #endif 1317 }; 1318 u_int i; 1319 1320 TAILQ_FOREACH(ifa, &mibifa_list, link) 1321 ifa->flags &= ~MIBIFA_FOUND; 1322 TAILQ_FOREACH(rcv, &mibrcvaddr_list, link) 1323 rcv->flags &= ~MIBRCVADDR_FOUND; 1324 1325 for (i = 0; i < sizeof(infos) / sizeof(infos[0]); i++) { 1326 if ((buf = mib_fetch_rtab(infos[i][0], infos[i][1], infos[i][2], 1327 &needed)) == NULL) 1328 continue; 1329 1330 next = buf; 1331 while (next < buf + needed) { 1332 rtm = (struct rt_msghdr *)(void *)next; 1333 next += rtm->rtm_msglen; 1334 handle_rtmsg(rtm); 1335 } 1336 free(buf); 1337 } 1338 1339 /* 1340 * Purge the address list of unused entries. These may happen for 1341 * interface aliases that are on the same subnet. We don't receive 1342 * routing socket messages for them. 1343 */ 1344 ifa = TAILQ_FIRST(&mibifa_list); 1345 while (ifa != NULL) { 1346 ifa1 = TAILQ_NEXT(ifa, link); 1347 if (!(ifa->flags & MIBIFA_FOUND)) 1348 destroy_ifa(ifa); 1349 ifa = ifa1; 1350 } 1351 1352 rcv = TAILQ_FIRST(&mibrcvaddr_list); 1353 while (rcv != NULL) { 1354 rcv1 = TAILQ_NEXT(rcv, link); 1355 if (!(rcv->flags & (MIBRCVADDR_FOUND | MIBRCVADDR_BCAST | 1356 MIBRCVADDR_HW))) 1357 mib_rcvaddr_delete(rcv); 1358 rcv = rcv1; 1359 } 1360 } 1361 1362 /* 1363 * Update arp table 1364 */ 1365 void 1366 mib_arp_update(void) 1367 { 1368 struct mibarp *at, *at1; 1369 size_t needed; 1370 u_char *buf, *next; 1371 struct rt_msghdr *rtm; 1372 1373 if (in_update_arp) 1374 return; /* Aaargh */ 1375 in_update_arp = 1; 1376 1377 TAILQ_FOREACH(at, &mibarp_list, link) 1378 at->flags &= ~MIBARP_FOUND; 1379 1380 if ((buf = mib_fetch_rtab(AF_INET, NET_RT_FLAGS, 0, &needed)) == NULL) { 1381 in_update_arp = 0; 1382 return; 1383 } 1384 1385 next = buf; 1386 while (next < buf + needed) { 1387 rtm = (struct rt_msghdr *)(void *)next; 1388 next += rtm->rtm_msglen; 1389 handle_rtmsg(rtm); 1390 } 1391 free(buf); 1392 1393 at = TAILQ_FIRST(&mibarp_list); 1394 while (at != NULL) { 1395 at1 = TAILQ_NEXT(at, link); 1396 if (!(at->flags & MIBARP_FOUND)) 1397 mib_arp_delete(at); 1398 at = at1; 1399 } 1400 mibarpticks = get_ticks(); 1401 in_update_arp = 0; 1402 } 1403 1404 1405 /* 1406 * Input on the routing socket. 1407 */ 1408 static void 1409 route_input(int fd, void *udata __unused) 1410 { 1411 u_char buf[1024 * 16]; 1412 ssize_t n; 1413 struct rt_msghdr *rtm; 1414 1415 if ((n = read(fd, buf, sizeof(buf))) == -1) 1416 err(1, "read(rt_socket)"); 1417 1418 if (n == 0) 1419 errx(1, "EOF on rt_socket"); 1420 1421 rtm = (struct rt_msghdr *)(void *)buf; 1422 if ((size_t)n != rtm->rtm_msglen) 1423 errx(1, "n=%zu, rtm_msglen=%u", (size_t)n, rtm->rtm_msglen); 1424 1425 handle_rtmsg(rtm); 1426 } 1427 1428 /* 1429 * execute and SIOCAIFADDR 1430 */ 1431 static int 1432 siocaifaddr(char *ifname, struct in_addr addr, struct in_addr mask, 1433 struct in_addr bcast) 1434 { 1435 struct ifaliasreq addreq; 1436 struct sockaddr_in *sa; 1437 1438 memset(&addreq, 0, sizeof(addreq)); 1439 strlcpy(addreq.ifra_name, ifname, sizeof(addreq.ifra_name)); 1440 1441 sa = (struct sockaddr_in *)(void *)&addreq.ifra_addr; 1442 sa->sin_family = AF_INET; 1443 sa->sin_len = sizeof(*sa); 1444 sa->sin_addr = addr; 1445 1446 sa = (struct sockaddr_in *)(void *)&addreq.ifra_mask; 1447 sa->sin_family = AF_INET; 1448 sa->sin_len = sizeof(*sa); 1449 sa->sin_addr = mask; 1450 1451 sa = (struct sockaddr_in *)(void *)&addreq.ifra_broadaddr; 1452 sa->sin_family = AF_INET; 1453 sa->sin_len = sizeof(*sa); 1454 sa->sin_addr = bcast; 1455 1456 return (ioctl(mib_netsock, SIOCAIFADDR, &addreq)); 1457 } 1458 1459 /* 1460 * Exececute a SIOCDIFADDR 1461 */ 1462 static int 1463 siocdifaddr(const char *ifname, struct in_addr addr) 1464 { 1465 struct ifreq delreq; 1466 struct sockaddr_in *sa; 1467 1468 memset(&delreq, 0, sizeof(delreq)); 1469 strlcpy(delreq.ifr_name, ifname, sizeof(delreq.ifr_name)); 1470 sa = (struct sockaddr_in *)(void *)&delreq.ifr_addr; 1471 sa->sin_family = AF_INET; 1472 sa->sin_len = sizeof(*sa); 1473 sa->sin_addr = addr; 1474 1475 return (ioctl(mib_netsock, SIOCDIFADDR, &delreq)); 1476 } 1477 1478 /* 1479 * Verify an interface address without fetching the entire list 1480 */ 1481 static int 1482 verify_ifa(const char *name, struct mibifa *ifa) 1483 { 1484 struct ifreq req; 1485 struct sockaddr_in *sa; 1486 1487 memset(&req, 0, sizeof(req)); 1488 strlcpy(req.ifr_name, name, sizeof(req.ifr_name)); 1489 sa = (struct sockaddr_in *)(void *)&req.ifr_addr; 1490 sa->sin_family = AF_INET; 1491 sa->sin_len = sizeof(*sa); 1492 sa->sin_addr = ifa->inaddr; 1493 1494 if (ioctl(mib_netsock, SIOCGIFADDR, &req) == -1) 1495 return (-1); 1496 if (ifa->inaddr.s_addr != sa->sin_addr.s_addr) { 1497 syslog(LOG_ERR, "%s: address mismatch", __func__); 1498 return (-1); 1499 } 1500 1501 if (ioctl(mib_netsock, SIOCGIFNETMASK, &req) == -1) 1502 return (-1); 1503 if (ifa->inmask.s_addr != sa->sin_addr.s_addr) { 1504 syslog(LOG_ERR, "%s: netmask mismatch", __func__); 1505 return (-1); 1506 } 1507 return (0); 1508 } 1509 1510 /* 1511 * Restore a deleted interface address. Don't wait for the routing socket 1512 * to update us. 1513 */ 1514 void 1515 mib_undestroy_ifa(struct mibifa *ifa) 1516 { 1517 struct mibif *ifp; 1518 1519 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) 1520 /* keep it destroyed */ 1521 return; 1522 1523 if (siocaifaddr(ifp->name, ifa->inaddr, ifa->inmask, ifa->inbcast)) 1524 /* keep it destroyed */ 1525 return; 1526 1527 ifa->flags &= ~MIBIFA_DESTROYED; 1528 } 1529 1530 /* 1531 * Destroy an interface address 1532 */ 1533 int 1534 mib_destroy_ifa(struct mibifa *ifa) 1535 { 1536 struct mibif *ifp; 1537 1538 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) { 1539 /* ups. */ 1540 mib_iflist_bad = 1; 1541 return (-1); 1542 } 1543 if (siocdifaddr(ifp->name, ifa->inaddr)) { 1544 /* ups. */ 1545 syslog(LOG_ERR, "SIOCDIFADDR: %m"); 1546 mib_iflist_bad = 1; 1547 return (-1); 1548 } 1549 ifa->flags |= MIBIFA_DESTROYED; 1550 return (0); 1551 } 1552 1553 /* 1554 * Rollback the modification of an address. Don't bother to wait for 1555 * the routing socket. 1556 */ 1557 void 1558 mib_unmodify_ifa(struct mibifa *ifa) 1559 { 1560 struct mibif *ifp; 1561 1562 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) { 1563 /* ups. */ 1564 mib_iflist_bad = 1; 1565 return; 1566 } 1567 1568 if (siocaifaddr(ifp->name, ifa->inaddr, ifa->inmask, ifa->inbcast)) { 1569 /* ups. */ 1570 mib_iflist_bad = 1; 1571 return; 1572 } 1573 } 1574 1575 /* 1576 * Modify an IFA. 1577 */ 1578 int 1579 mib_modify_ifa(struct mibifa *ifa) 1580 { 1581 struct mibif *ifp; 1582 1583 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) { 1584 /* ups. */ 1585 mib_iflist_bad = 1; 1586 return (-1); 1587 } 1588 1589 if (siocaifaddr(ifp->name, ifa->inaddr, ifa->inmask, ifa->inbcast)) { 1590 /* ups. */ 1591 mib_iflist_bad = 1; 1592 return (-1); 1593 } 1594 1595 if (verify_ifa(ifp->name, ifa)) { 1596 /* ups. */ 1597 mib_iflist_bad = 1; 1598 return (-1); 1599 } 1600 1601 return (0); 1602 } 1603 1604 /* 1605 * Destroy a freshly created interface address. Don't bother to wait for 1606 * the routing socket. 1607 */ 1608 void 1609 mib_uncreate_ifa(struct mibifa *ifa) 1610 { 1611 struct mibif *ifp; 1612 1613 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) { 1614 /* ups. */ 1615 mib_iflist_bad = 1; 1616 return; 1617 } 1618 if (siocdifaddr(ifp->name, ifa->inaddr)) { 1619 /* ups. */ 1620 mib_iflist_bad = 1; 1621 return; 1622 } 1623 1624 destroy_ifa(ifa); 1625 } 1626 1627 /* 1628 * Create a new ifa and verify it 1629 */ 1630 struct mibifa * 1631 mib_create_ifa(u_int ifindex, struct in_addr addr, struct in_addr mask, 1632 struct in_addr bcast) 1633 { 1634 struct mibif *ifp; 1635 struct mibifa *ifa; 1636 1637 if ((ifp = mib_find_if(ifindex)) == NULL) 1638 return (NULL); 1639 if ((ifa = alloc_ifa(ifindex, addr)) == NULL) 1640 return (NULL); 1641 ifa->inmask = mask; 1642 ifa->inbcast = bcast; 1643 1644 if (siocaifaddr(ifp->name, ifa->inaddr, ifa->inmask, ifa->inbcast)) { 1645 syslog(LOG_ERR, "%s: %m", __func__); 1646 destroy_ifa(ifa); 1647 return (NULL); 1648 } 1649 if (verify_ifa(ifp->name, ifa)) { 1650 destroy_ifa(ifa); 1651 return (NULL); 1652 } 1653 return (ifa); 1654 } 1655 1656 /* 1657 * Get all cloning interfaces and make them dynamic. 1658 * Hah! Whe should probably do this on a periodic basis (XXX). 1659 */ 1660 static void 1661 get_cloners(void) 1662 { 1663 struct if_clonereq req; 1664 char *buf, *cp; 1665 int i; 1666 1667 memset(&req, 0, sizeof(req)); 1668 if (ioctl(mib_netsock, SIOCIFGCLONERS, &req) == -1) { 1669 syslog(LOG_ERR, "get cloners: %m"); 1670 return; 1671 } 1672 if ((buf = malloc(req.ifcr_total * IFNAMSIZ)) == NULL) { 1673 syslog(LOG_ERR, "%m"); 1674 return; 1675 } 1676 req.ifcr_count = req.ifcr_total; 1677 req.ifcr_buffer = buf; 1678 if (ioctl(mib_netsock, SIOCIFGCLONERS, &req) == -1) { 1679 syslog(LOG_ERR, "get cloners: %m"); 1680 free(buf); 1681 return; 1682 } 1683 for (cp = buf, i = 0; i < req.ifcr_total; i++, cp += IFNAMSIZ) 1684 mib_if_set_dyn(cp); 1685 free(buf); 1686 } 1687 1688 /* 1689 * Idle function 1690 */ 1691 static void 1692 mibII_idle(void *arg __unused) 1693 { 1694 struct mibifa *ifa; 1695 1696 if (mib_iflist_bad) { 1697 TAILQ_FOREACH(ifa, &mibifa_list, link) 1698 ifa->flags &= ~MIBIFA_DESTROYED; 1699 1700 /* assume, that all cloning interfaces are dynamic */ 1701 get_cloners(); 1702 1703 mib_refresh_iflist(); 1704 update_ifa_info(); 1705 mib_arp_update(); 1706 mib_iflist_bad = 0; 1707 } 1708 1709 mib_arp_update(); 1710 } 1711 1712 1713 /* 1714 * Start the module 1715 */ 1716 static void 1717 mibII_start(void) 1718 { 1719 if ((route_fd = fd_select(route, route_input, NULL, module)) == NULL) { 1720 syslog(LOG_ERR, "fd_select(route): %m"); 1721 return; 1722 } 1723 mib_refresh_iflist(); 1724 update_ifa_info(); 1725 mib_arp_update(); 1726 (void)mib_fetch_route(); 1727 mib_iftable_last_change = 0; 1728 mib_ifstack_last_change = 0; 1729 1730 ifmib_reg = or_register(&oid_ifMIB, 1731 "The MIB module to describe generic objects for network interface" 1732 " sub-layers.", module); 1733 1734 ipmib_reg = or_register(&oid_ipMIB, 1735 "The MIB module for managing IP and ICMP implementations, but " 1736 "excluding their management of IP routes.", module); 1737 1738 tcpmib_reg = or_register(&oid_tcpMIB, 1739 "The MIB module for managing TCP implementations.", module); 1740 1741 udpmib_reg = or_register(&oid_udpMIB, 1742 "The MIB module for managing UDP implementations.", module); 1743 1744 ipForward_reg = or_register(&oid_ipForward, 1745 "The MIB module for the display of CIDR multipath IP Routes.", 1746 module); 1747 1748 mibII_poll_timer = NULL; 1749 mibII_poll_ticks = MIBII_POLL_TICKS; 1750 mibif_restart_mibII_poll_timer(); 1751 } 1752 1753 /* 1754 * Initialize the module 1755 */ 1756 static int 1757 mibII_init(struct lmodule *mod, int argc __unused, char *argv[] __unused) 1758 { 1759 size_t len; 1760 1761 module = mod; 1762 1763 len = sizeof(clockinfo); 1764 if (sysctlbyname("kern.clockrate", &clockinfo, &len, NULL, 0) == -1) { 1765 syslog(LOG_ERR, "kern.clockrate: %m"); 1766 return (-1); 1767 } 1768 if (len != sizeof(clockinfo)) { 1769 syslog(LOG_ERR, "kern.clockrate: wrong size"); 1770 return (-1); 1771 } 1772 1773 if ((route = socket(PF_ROUTE, SOCK_RAW, AF_UNSPEC)) == -1) { 1774 syslog(LOG_ERR, "PF_ROUTE: %m"); 1775 return (-1); 1776 } 1777 1778 if ((mib_netsock = socket(PF_INET, SOCK_DGRAM, 0)) == -1) { 1779 syslog(LOG_ERR, "PF_INET: %m"); 1780 (void)close(route); 1781 return (-1); 1782 } 1783 (void)shutdown(mib_netsock, SHUT_RDWR); 1784 1785 /* assume, that all cloning interfaces are dynamic */ 1786 get_cloners(); 1787 1788 return (0); 1789 } 1790 1791 static int 1792 mibII_fini(void) 1793 { 1794 if (mibII_poll_timer != NULL ) { 1795 timer_stop(mibII_poll_timer); 1796 mibII_poll_timer = NULL; 1797 } 1798 1799 if (route_fd != NULL) 1800 fd_deselect(route_fd); 1801 if (route != -1) 1802 (void)close(route); 1803 if (mib_netsock != -1) 1804 (void)close(mib_netsock); 1805 /* XXX free memory */ 1806 1807 or_unregister(ipForward_reg); 1808 or_unregister(udpmib_reg); 1809 or_unregister(tcpmib_reg); 1810 or_unregister(ipmib_reg); 1811 or_unregister(ifmib_reg); 1812 1813 return (0); 1814 } 1815 1816 static void 1817 mibII_loading(const struct lmodule *mod, int loaded) 1818 { 1819 struct mibif *ifp; 1820 1821 if (loaded == 1) 1822 return; 1823 1824 TAILQ_FOREACH(ifp, &mibif_list, link) 1825 if (ifp->xnotify_mod == mod) { 1826 ifp->xnotify_mod = NULL; 1827 ifp->xnotify_data = NULL; 1828 ifp->xnotify = NULL; 1829 } 1830 1831 mib_unregister_newif(mod); 1832 } 1833 1834 extern const struct snmp_module config; 1835 const struct snmp_module config = { 1836 "This module implements the interface and ip groups.", 1837 mibII_init, 1838 mibII_fini, 1839 NULL, /* idle */ 1840 NULL, /* dump */ 1841 NULL, /* config */ 1842 mibII_start, 1843 NULL, 1844 mibII_ctree, 1845 mibII_CTREE_SIZE, 1846 mibII_loading 1847 }; 1848 1849 /* 1850 * Should have a list of these attached to each interface. 1851 */ 1852 void * 1853 mibif_notify(struct mibif *ifp, const struct lmodule *mod, 1854 mibif_notify_f func, void *data) 1855 { 1856 ifp->xnotify = func; 1857 ifp->xnotify_data = data; 1858 ifp->xnotify_mod = mod; 1859 1860 return (ifp); 1861 } 1862 1863 void 1864 mibif_unnotify(void *arg) 1865 { 1866 struct mibif *ifp = arg; 1867 1868 ifp->xnotify = NULL; 1869 ifp->xnotify_data = NULL; 1870 ifp->xnotify_mod = NULL; 1871 } 1872