1 /* $NetBSD: vif.c,v 1.6 1995/12/10 10:07:19 mycroft Exp $ */ 2 3 /* 4 * The mrouted program is covered by the license in the accompanying file 5 * named "LICENSE". Use of the mrouted program represents acceptance of 6 * the terms and conditions listed in that file. 7 * 8 * The mrouted program is COPYRIGHT 1989 by The Board of Trustees of 9 * Leland Stanford Junior University. 10 */ 11 12 13 #include "defs.h" 14 #include <fcntl.h> 15 16 /* 17 * Exported variables. 18 */ 19 struct uvif uvifs[MAXVIFS]; /* array of virtual interfaces */ 20 vifi_t numvifs; /* number of vifs in use */ 21 int vifs_down; /* 1=>some interfaces are down */ 22 int phys_vif; /* An enabled vif */ 23 int udp_socket; /* Since the honkin' kernel doesn't support */ 24 /* ioctls on raw IP sockets, we need a UDP */ 25 /* socket as well as our IGMP (raw) socket. */ 26 /* How dumb. */ 27 int vifs_with_neighbors; /* == 1 if I am a leaf */ 28 29 typedef struct { 30 vifi_t vifi; 31 struct listaddr *g; 32 int q_time; 33 } cbk_t; 34 35 /* 36 * Forward declarations. 37 */ 38 static void start_vif(vifi_t vifi); 39 static void start_vif2(vifi_t vifi); 40 static void stop_vif(vifi_t vifi); 41 static void age_old_hosts(void); 42 static void send_probe_on_vif(struct uvif *v); 43 static int info_version(char *p, int); 44 static void DelVif(void *arg); 45 static int SetTimer(int vifi, struct listaddr *g); 46 static int DeleteTimer(int id); 47 static void SendQuery(void *arg); 48 static int SetQueryTimer(struct listaddr *g, vifi_t vifi, int to_expire, 49 int q_time); 50 51 52 /* 53 * Initialize the virtual interfaces, but do not install 54 * them in the kernel. Start routing on all vifs that are 55 * not down or disabled. 56 */ 57 void 58 init_vifs(void) 59 { 60 vifi_t vifi; 61 struct uvif *v; 62 int enabled_vifs, enabled_phyints; 63 extern char *configfilename; 64 65 numvifs = 0; 66 vifs_with_neighbors = 0; 67 vifs_down = FALSE; 68 69 /* 70 * Configure the vifs based on the interface configuration of the 71 * the kernel and the contents of the configuration file. 72 * (Open a UDP socket for ioctl use in the config procedures.) 73 */ 74 if ((udp_socket = socket(AF_INET, SOCK_DGRAM, 0)) < 0) 75 logit(LOG_ERR, errno, "UDP socket"); 76 logit(LOG_INFO,0,"Getting vifs from kernel interfaces"); 77 config_vifs_from_kernel(); 78 logit(LOG_INFO,0,"Getting vifs from %s",configfilename); 79 config_vifs_from_file(); 80 81 /* 82 * Quit if there are fewer than two enabled vifs. 83 */ 84 enabled_vifs = 0; 85 enabled_phyints = 0; 86 phys_vif = -1; 87 for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) { 88 if (!(v->uv_flags & VIFF_DISABLED)) { 89 ++enabled_vifs; 90 if (!(v->uv_flags & VIFF_TUNNEL)) { 91 if (phys_vif == -1) 92 phys_vif = vifi; 93 ++enabled_phyints; 94 } 95 } 96 } 97 if (enabled_vifs < 2) 98 logit(LOG_ERR, 0, "can't forward: %s", 99 enabled_vifs == 0 ? "no enabled vifs" : "only one enabled vif"); 100 101 if (enabled_phyints == 0) 102 logit(LOG_WARNING, 0, 103 "no enabled interfaces, forwarding via tunnels only"); 104 105 logit(LOG_INFO, 0, "Installing vifs in mrouted..."); 106 for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) { 107 if (!(v->uv_flags & VIFF_DISABLED)) { 108 if (!(v->uv_flags & VIFF_DOWN)) { 109 if (v->uv_flags & VIFF_TUNNEL) 110 logit(LOG_INFO, 0, "vif #%d, tunnel %s -> %s", vifi, 111 inet_fmt(v->uv_lcl_addr, s1), 112 inet_fmt(v->uv_rmt_addr, s2)); 113 else 114 logit(LOG_INFO, 0, "vif #%d, phyint %s", vifi, 115 inet_fmt(v->uv_lcl_addr, s1)); 116 start_vif2(vifi); 117 } else logit(LOG_INFO, 0, 118 "%s is not yet up; vif #%u not in service", 119 v->uv_name, vifi); 120 } 121 } 122 } 123 124 /* 125 * Start routing on all virtual interfaces that are not down or 126 * administratively disabled. 127 */ 128 void 129 init_installvifs(void) 130 { 131 vifi_t vifi; 132 struct uvif *v; 133 134 logit(LOG_INFO, 0, "Installing vifs in kernel..."); 135 for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) { 136 if (!(v->uv_flags & VIFF_DISABLED)) { 137 if (!(v->uv_flags & VIFF_DOWN)) { 138 if (v->uv_flags & VIFF_TUNNEL) 139 logit(LOG_INFO, 0, "vif #%d, tunnel %s -> %s", vifi, 140 inet_fmt(v->uv_lcl_addr, s1), 141 inet_fmt(v->uv_rmt_addr, s2)); 142 else 143 logit(LOG_INFO, 0, "vif #%d, phyint %s", vifi, 144 inet_fmt(v->uv_lcl_addr, s1)); 145 k_add_vif(vifi, &uvifs[vifi]); 146 } else logit(LOG_INFO, 0, 147 "%s is not yet up; vif #%u not in service", 148 v->uv_name, vifi); 149 } 150 } 151 } 152 153 /* 154 * See if any interfaces have changed from up state to down, or vice versa, 155 * including any non-multicast-capable interfaces that are in use as local 156 * tunnel end-points. Ignore interfaces that have been administratively 157 * disabled. 158 */ 159 void 160 check_vif_state(void) 161 { 162 vifi_t vifi; 163 struct uvif *v; 164 struct ifreq ifr; 165 166 vifs_down = FALSE; 167 for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) { 168 169 if (v->uv_flags & VIFF_DISABLED) continue; 170 171 strncpy(ifr.ifr_name, v->uv_name, IFNAMSIZ); 172 if (ioctl(udp_socket, SIOCGIFFLAGS, (char *)&ifr) < 0) 173 logit(LOG_ERR, errno, 174 "ioctl SIOCGIFFLAGS for %s", ifr.ifr_name); 175 176 if (v->uv_flags & VIFF_DOWN) { 177 if (ifr.ifr_flags & IFF_UP) { 178 v->uv_flags &= ~VIFF_DOWN; 179 start_vif(vifi); 180 logit(LOG_INFO, 0, 181 "%s has come up; vif #%u now in service", 182 v->uv_name, vifi); 183 } 184 else vifs_down = TRUE; 185 } 186 else { 187 if (!(ifr.ifr_flags & IFF_UP)) { 188 stop_vif(vifi); 189 v->uv_flags |= VIFF_DOWN; 190 logit(LOG_INFO, 0, 191 "%s has gone down; vif #%u taken out of service", 192 v->uv_name, vifi); 193 vifs_down = TRUE; 194 } 195 } 196 } 197 } 198 199 /* 200 * Send a probe message on vif v 201 */ 202 static void 203 send_probe_on_vif(struct uvif *v) 204 { 205 char *p; 206 int datalen = 0; 207 struct listaddr *nbr; 208 int i; 209 210 p = send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN; 211 212 for (i = 0; i < 4; i++) 213 *p++ = ((char *)&(dvmrp_genid))[i]; 214 datalen += 4; 215 216 /* 217 * add the neighbor list on the interface to the message 218 */ 219 nbr = v->uv_neighbors; 220 221 while (nbr) { 222 for (i = 0; i < 4; i++) 223 *p++ = ((char *)&nbr->al_addr)[i]; 224 datalen +=4; 225 nbr = nbr->al_next; 226 } 227 228 send_igmp(v->uv_lcl_addr, 229 (v->uv_flags & VIFF_TUNNEL) ? v->uv_rmt_addr 230 : dvmrp_group, 231 IGMP_DVMRP, DVMRP_PROBE, 232 htonl(MROUTED_LEVEL | 233 ((v->uv_flags & VIFF_LEAF) ? 0 : LEAF_FLAGS)), 234 datalen); 235 } 236 237 /* 238 * Add a vifi to the kernel and start routing on it. 239 */ 240 static void 241 start_vif(vifi_t vifi) 242 { 243 /* 244 * Install the interface in the kernel's vif structure. 245 */ 246 k_add_vif(vifi, &uvifs[vifi]); 247 248 start_vif2(vifi); 249 } 250 251 /* 252 * Add a vifi to all the user-level data structures but don't add 253 * it to the kernel yet. 254 */ 255 static void 256 start_vif2(vifi_t vifi) 257 { 258 struct uvif *v; 259 u_int32_t src; 260 struct phaddr *p; 261 262 v = &uvifs[vifi]; 263 src = v->uv_lcl_addr; 264 265 /* 266 * Update the existing route entries to take into account the new vif. 267 */ 268 add_vif_to_routes(vifi); 269 270 if (!(v->uv_flags & VIFF_TUNNEL)) { 271 /* 272 * Join the DVMRP multicast group on the interface. 273 * (This is not strictly necessary, since the kernel promiscuously 274 * receives IGMP packets addressed to ANY IP multicast group while 275 * multicast routing is enabled. However, joining the group allows 276 * this host to receive non-IGMP packets as well, such as 'pings'.) 277 */ 278 k_join(dvmrp_group, src); 279 280 /* 281 * Join the ALL-ROUTERS multicast group on the interface. 282 * This allows mtrace requests to loop back if they are run 283 * on the multicast router. 284 */ 285 k_join(allrtrs_group, src); 286 287 /* 288 * Install an entry in the routing table for the subnet to which 289 * the interface is connected. 290 */ 291 start_route_updates(); 292 update_route(v->uv_subnet, v->uv_subnetmask, 0, 0, vifi); 293 for (p = v->uv_addrs; p; p = p->pa_next) { 294 start_route_updates(); 295 update_route(p->pa_subnet, p->pa_subnetmask, 0, 0, vifi); 296 } 297 298 /* 299 * Until neighbors are discovered, assume responsibility for sending 300 * periodic group membership queries to the subnet. Send the first 301 * query. 302 */ 303 v->uv_flags |= VIFF_QUERIER; 304 send_igmp(src, allhosts_group, IGMP_HOST_MEMBERSHIP_QUERY, 305 (v->uv_flags & VIFF_IGMPV1) ? 0 : 306 IGMP_MAX_HOST_REPORT_DELAY * IGMP_TIMER_SCALE, 0, 0); 307 age_old_hosts(); 308 } 309 310 v->uv_leaf_timer = LEAF_CONFIRMATION_TIME; 311 312 /* 313 * Send a probe via the new vif to look for neighbors. 314 */ 315 send_probe_on_vif(v); 316 } 317 318 /* 319 * Stop routing on the specified virtual interface. 320 */ 321 static void 322 stop_vif(vifi_t vifi) 323 { 324 struct uvif *v; 325 struct listaddr *a; 326 struct phaddr *p; 327 328 v = &uvifs[vifi]; 329 330 if (!(v->uv_flags & VIFF_TUNNEL)) { 331 /* 332 * Depart from the DVMRP multicast group on the interface. 333 */ 334 k_leave(dvmrp_group, v->uv_lcl_addr); 335 336 /* 337 * Depart from the ALL-ROUTERS multicast group on the interface. 338 */ 339 k_leave(allrtrs_group, v->uv_lcl_addr); 340 341 /* 342 * Update the entry in the routing table for the subnet to which 343 * the interface is connected, to take into account the interface 344 * failure. 345 */ 346 start_route_updates(); 347 update_route(v->uv_subnet, v->uv_subnetmask, UNREACHABLE, 0, vifi); 348 for (p = v->uv_addrs; p; p = p->pa_next) { 349 start_route_updates(); 350 update_route(p->pa_subnet, p->pa_subnetmask, UNREACHABLE, 0, vifi); 351 } 352 353 /* 354 * Discard all group addresses. (No need to tell kernel; 355 * the k_del_vif() call, below, will clean up kernel state.) 356 */ 357 while (v->uv_groups != NULL) { 358 a = v->uv_groups; 359 v->uv_groups = a->al_next; 360 free((char *)a); 361 } 362 363 v->uv_flags &= ~VIFF_QUERIER; 364 } 365 366 /* 367 * Update the existing route entries to take into account the vif failure. 368 */ 369 delete_vif_from_routes(vifi); 370 371 /* 372 * Delete the interface from the kernel's vif structure. 373 */ 374 k_del_vif(vifi); 375 376 /* 377 * Discard all neighbor addresses. 378 */ 379 if (v->uv_neighbors) 380 vifs_with_neighbors--; 381 382 while (v->uv_neighbors != NULL) { 383 a = v->uv_neighbors; 384 v->uv_neighbors = a->al_next; 385 free((char *)a); 386 } 387 } 388 389 390 /* 391 * stop routing on all vifs 392 */ 393 void 394 stop_all_vifs(void) 395 { 396 vifi_t vifi; 397 struct uvif *v; 398 struct listaddr *a; 399 struct vif_acl *acl; 400 401 for (vifi = 0; vifi < numvifs; vifi++) { 402 v = &uvifs[vifi]; 403 while (v->uv_groups != NULL) { 404 a = v->uv_groups; 405 v->uv_groups = a->al_next; 406 free((char *)a); 407 } 408 while (v->uv_neighbors != NULL) { 409 a = v->uv_neighbors; 410 v->uv_neighbors = a->al_next; 411 free((char *)a); 412 } 413 while (v->uv_acl != NULL) { 414 acl = v->uv_acl; 415 v->uv_acl = acl->acl_next; 416 free((char *)acl); 417 } 418 } 419 } 420 421 422 /* 423 * Find the virtual interface from which an incoming packet arrived, 424 * based on the packet's source and destination IP addresses. 425 */ 426 vifi_t 427 find_vif(u_int32_t src, u_int32_t dst) 428 { 429 vifi_t vifi; 430 struct uvif *v; 431 struct phaddr *p; 432 433 for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) { 434 if (!(v->uv_flags & (VIFF_DOWN|VIFF_DISABLED))) { 435 if (v->uv_flags & VIFF_TUNNEL) { 436 if (src == v->uv_rmt_addr && dst == v->uv_lcl_addr) 437 return(vifi); 438 } 439 else { 440 if ((src & v->uv_subnetmask) == v->uv_subnet && 441 ((v->uv_subnetmask == 0xffffffff) || 442 (src != v->uv_subnetbcast))) 443 return(vifi); 444 for (p=v->uv_addrs; p; p=p->pa_next) { 445 if ((src & p->pa_subnetmask) == p->pa_subnet && 446 ((p->pa_subnetmask == 0xffffffff) || 447 (src != p->pa_subnetbcast))) 448 return(vifi); 449 } 450 } 451 } 452 } 453 return (NO_VIF); 454 } 455 456 static void 457 age_old_hosts(void) 458 { 459 vifi_t vifi; 460 struct uvif *v; 461 struct listaddr *g; 462 463 /* 464 * Decrement the old-hosts-present timer for each 465 * active group on each vif. 466 */ 467 for (vifi = 0, v = uvifs; vifi < numvifs; vifi++, v++) 468 for (g = v->uv_groups; g != NULL; g = g->al_next) 469 if (g->al_old) 470 g->al_old--; 471 } 472 473 474 /* 475 * Send group membership queries to all subnets for which I am querier. 476 */ 477 void 478 query_groups(void) 479 { 480 vifi_t vifi; 481 struct uvif *v; 482 483 for (vifi = 0, v = uvifs; vifi < numvifs; vifi++, v++) { 484 if (v->uv_flags & VIFF_QUERIER) { 485 send_igmp(v->uv_lcl_addr, allhosts_group, 486 IGMP_HOST_MEMBERSHIP_QUERY, 487 (v->uv_flags & VIFF_IGMPV1) ? 0 : 488 IGMP_MAX_HOST_REPORT_DELAY * IGMP_TIMER_SCALE, 0, 0); 489 } 490 } 491 age_old_hosts(); 492 } 493 494 /* 495 * Process an incoming host membership query 496 */ 497 void 498 accept_membership_query(u_int32_t src, u_int32_t dst, u_int32_t group, 499 int tmo) 500 { 501 vifi_t vifi; 502 struct uvif *v; 503 504 if ((vifi = find_vif(src, dst)) == NO_VIF || 505 (uvifs[vifi].uv_flags & VIFF_TUNNEL)) { 506 logit(LOG_INFO, 0, 507 "ignoring group membership query from non-adjacent host %s", 508 inet_fmt(src, s1)); 509 return; 510 } 511 512 v = &uvifs[vifi]; 513 514 /* 515 * If we consider ourselves the querier for this vif, but hear a 516 * query from a router with a lower IP address, yield to them. 517 * 518 * This is done here as well as in the neighbor discovery in case 519 * there is a querier that doesn't speak DVMRP. 520 * 521 * XXX If this neighbor doesn't speak DVMRP, then we need to create 522 * some neighbor state for him so that we can time him out! 523 */ 524 if ((v->uv_flags & VIFF_QUERIER) && 525 (ntohl(src) < ntohl(v->uv_lcl_addr))) { 526 v->uv_flags &= ~VIFF_QUERIER; 527 528 } 529 } 530 531 /* 532 * Process an incoming group membership report. 533 */ 534 void 535 accept_group_report(u_int32_t src, u_int32_t dst, u_int32_t group, 536 int r_type) 537 { 538 vifi_t vifi; 539 struct uvif *v; 540 struct listaddr *g; 541 542 if ((vifi = find_vif(src, dst)) == NO_VIF || 543 (uvifs[vifi].uv_flags & VIFF_TUNNEL)) { 544 logit(LOG_INFO, 0, 545 "ignoring group membership report from non-adjacent host %s", 546 inet_fmt(src, s1)); 547 return; 548 } 549 550 v = &uvifs[vifi]; 551 552 /* 553 * Look for the group in our group list; if found, reset its timer. 554 */ 555 for (g = v->uv_groups; g != NULL; g = g->al_next) { 556 if (group == g->al_addr) { 557 if (r_type == IGMP_v1_HOST_MEMBERSHIP_REPORT) 558 g->al_old = OLD_AGE_THRESHOLD; 559 560 /** delete old timers, set a timer for expiration **/ 561 g->al_timer = GROUP_EXPIRE_TIME; 562 if (g->al_query) 563 g->al_query = DeleteTimer(g->al_query); 564 if (g->al_timerid) 565 g->al_timerid = DeleteTimer(g->al_timerid); 566 g->al_timerid = SetTimer(vifi, g); 567 break; 568 } 569 } 570 571 /* 572 * If not found, add it to the list and update kernel cache. 573 */ 574 if (g == NULL) { 575 g = malloc(sizeof(struct listaddr)); 576 if (g == NULL) 577 logit(LOG_ERR, 0, "ran out of memory"); /* fatal */ 578 579 g->al_addr = group; 580 if (r_type == IGMP_v2_HOST_MEMBERSHIP_REPORT) 581 g->al_old = 0; 582 else 583 g->al_old = OLD_AGE_THRESHOLD; 584 585 /** set a timer for expiration **/ 586 g->al_query = 0; 587 g->al_timer = GROUP_EXPIRE_TIME; 588 time(&g->al_ctime); 589 g->al_timerid = SetTimer(vifi, g); 590 g->al_next = v->uv_groups; 591 v->uv_groups = g; 592 593 update_lclgrp(vifi, group); 594 } 595 596 /* 597 * Check if a graft is necessary for this group 598 */ 599 chkgrp_graft(vifi, group); 600 } 601 602 603 void 604 accept_leave_message(u_int32_t src, u_int32_t dst, u_int32_t group) 605 { 606 vifi_t vifi; 607 struct uvif *v; 608 struct listaddr *g; 609 610 if ((vifi = find_vif(src, dst)) == NO_VIF || 611 (uvifs[vifi].uv_flags & VIFF_TUNNEL)) { 612 logit(LOG_INFO, 0, 613 "ignoring group leave report from non-adjacent host %s", 614 inet_fmt(src, s1)); 615 return; 616 } 617 618 v = &uvifs[vifi]; 619 620 if (!(v->uv_flags & VIFF_QUERIER) || (v->uv_flags & VIFF_IGMPV1)) 621 return; 622 623 /* 624 * Look for the group in our group list in order to set up a short-timeout 625 * query. 626 */ 627 for (g = v->uv_groups; g != NULL; g = g->al_next) { 628 if (group == g->al_addr) { 629 logit(LOG_DEBUG, 0, 630 "[vif.c, _accept_leave_message] %d %d \n", 631 g->al_old, g->al_query); 632 633 /* Ignore the leave message if there are old hosts present */ 634 if (g->al_old) 635 return; 636 637 /* still waiting for a reply to a query, ignore the leave */ 638 if (g->al_query) 639 return; 640 641 /** delete old timer set a timer for expiration **/ 642 if (g->al_timerid) 643 g->al_timerid = DeleteTimer(g->al_timerid); 644 645 /** send a group specific querry **/ 646 g->al_timer = LEAVE_EXPIRE_TIME; 647 send_igmp(v->uv_lcl_addr, g->al_addr, 648 IGMP_HOST_MEMBERSHIP_QUERY, 649 LEAVE_EXPIRE_TIME / 3 * IGMP_TIMER_SCALE, 650 g->al_addr, 0); 651 g->al_query = SetQueryTimer(g, vifi, g->al_timer / 3, 652 LEAVE_EXPIRE_TIME / 3 * IGMP_TIMER_SCALE); 653 g->al_timerid = SetTimer(vifi, g); 654 break; 655 } 656 } 657 } 658 659 660 /* 661 * Send a periodic probe on all vifs. 662 * Useful to determine one-way interfaces. 663 * Detect neighbor loss faster. 664 */ 665 void 666 probe_for_neighbors(void) 667 { 668 vifi_t vifi; 669 struct uvif *v; 670 671 for (vifi = 0, v = uvifs; vifi < numvifs; vifi++, v++) { 672 if (!(v->uv_flags & (VIFF_DOWN|VIFF_DISABLED))) { 673 send_probe_on_vif(v); 674 } 675 } 676 } 677 678 679 /* 680 * Send a list of all of our neighbors to the requestor, `src'. 681 */ 682 void 683 accept_neighbor_request(u_int32_t src, u_int32_t dst) 684 { 685 vifi_t vifi; 686 struct uvif *v; 687 u_char *p, *ncount; 688 struct listaddr *la; 689 int datalen; 690 u_int32_t temp_addr, us, them = src; 691 692 /* Determine which of our addresses to use as the source of our response 693 * to this query. 694 */ 695 if (IN_MULTICAST(ntohl(dst))) { /* query sent to a multicast group */ 696 int udp; /* find best interface to reply on */ 697 struct sockaddr_in addr; 698 int addrlen = sizeof(addr); 699 700 memset(&addr, 0, sizeof addr); 701 addr.sin_family = AF_INET; 702 addr.sin_len = sizeof addr; 703 addr.sin_addr.s_addr = dst; 704 addr.sin_port = htons(2000); /* any port over 1024 will do... */ 705 if ((udp = socket(AF_INET, SOCK_DGRAM, 0)) < 0 706 || connect(udp, (struct sockaddr *) &addr, sizeof(addr)) < 0 707 || getsockname(udp, (struct sockaddr *) &addr, &addrlen) < 0) { 708 logit(LOG_WARNING, errno, "Determining local address"); 709 close(udp); 710 return; 711 } 712 close(udp); 713 us = addr.sin_addr.s_addr; 714 } else /* query sent to us alone */ 715 us = dst; 716 717 #define PUT_ADDR(a) temp_addr = ntohl(a); \ 718 *p++ = temp_addr >> 24; \ 719 *p++ = (temp_addr >> 16) & 0xFF; \ 720 *p++ = (temp_addr >> 8) & 0xFF; \ 721 *p++ = temp_addr & 0xFF; 722 723 p = (u_char *) (send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN); 724 datalen = 0; 725 726 for (vifi = 0, v = uvifs; vifi < numvifs; vifi++, v++) { 727 if (v->uv_flags & VIFF_DISABLED) 728 continue; 729 730 ncount = 0; 731 732 for (la = v->uv_neighbors; la; la = la->al_next) { 733 734 /* Make sure that there's room for this neighbor... */ 735 if (datalen + (ncount == 0 ? 4 + 3 + 4 : 4) > MAX_DVMRP_DATA_LEN) { 736 send_igmp(us, them, IGMP_DVMRP, DVMRP_NEIGHBORS, 737 htonl(MROUTED_LEVEL), datalen); 738 p = (u_char *) (send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN); 739 datalen = 0; 740 ncount = 0; 741 } 742 743 /* Put out the header for this neighbor list... */ 744 if (ncount == 0) { 745 PUT_ADDR(v->uv_lcl_addr); 746 *p++ = v->uv_metric; 747 *p++ = v->uv_threshold; 748 ncount = p; 749 *p++ = 0; 750 datalen += 4 + 3; 751 } 752 753 PUT_ADDR(la->al_addr); 754 datalen += 4; 755 (*ncount)++; 756 } 757 } 758 759 if (datalen != 0) 760 send_igmp(us, them, IGMP_DVMRP, DVMRP_NEIGHBORS, htonl(MROUTED_LEVEL), 761 datalen); 762 } 763 764 /* 765 * Send a list of all of our neighbors to the requestor, `src'. 766 */ 767 void 768 accept_neighbor_request2(u_int32_t src, u_int32_t dst) 769 { 770 vifi_t vifi; 771 struct uvif *v; 772 u_char *p, *ncount; 773 struct listaddr *la; 774 int datalen; 775 u_int32_t us, them = src; 776 777 /* Determine which of our addresses to use as the source of our response 778 * to this query. 779 */ 780 if (IN_MULTICAST(ntohl(dst))) { /* query sent to a multicast group */ 781 int udp; /* find best interface to reply on */ 782 struct sockaddr_in addr; 783 int addrlen = sizeof(addr); 784 785 memset(&addr, 0, sizeof addr); 786 addr.sin_family = AF_INET; 787 addr.sin_len = sizeof addr; 788 addr.sin_addr.s_addr = dst; 789 addr.sin_port = htons(2000); /* any port over 1024 will do... */ 790 if ((udp = socket(AF_INET, SOCK_DGRAM, 0)) < 0 791 || connect(udp, (struct sockaddr *) &addr, sizeof(addr)) < 0 792 || getsockname(udp, (struct sockaddr *) &addr, &addrlen) < 0) { 793 logit(LOG_WARNING, errno, "Determining local address"); 794 close(udp); 795 return; 796 } 797 close(udp); 798 us = addr.sin_addr.s_addr; 799 } else /* query sent to us alone */ 800 us = dst; 801 802 p = (u_char *) (send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN); 803 datalen = 0; 804 805 for (vifi = 0, v = uvifs; vifi < numvifs; vifi++, v++) { 806 u_short vflags = v->uv_flags; 807 u_char rflags = 0; 808 if (vflags & VIFF_TUNNEL) 809 rflags |= DVMRP_NF_TUNNEL; 810 if (vflags & VIFF_SRCRT) 811 rflags |= DVMRP_NF_SRCRT; 812 if (vflags & VIFF_DOWN) 813 rflags |= DVMRP_NF_DOWN; 814 if (vflags & VIFF_DISABLED) 815 rflags |= DVMRP_NF_DISABLED; 816 if (vflags & VIFF_QUERIER) 817 rflags |= DVMRP_NF_QUERIER; 818 if (vflags & VIFF_LEAF) 819 rflags |= DVMRP_NF_LEAF; 820 ncount = 0; 821 la = v->uv_neighbors; 822 if (la == NULL) { 823 /* 824 * include down & disabled interfaces and interfaces on 825 * leaf nets. 826 */ 827 if (rflags & DVMRP_NF_TUNNEL) 828 rflags |= DVMRP_NF_DOWN; 829 if (datalen > MAX_DVMRP_DATA_LEN - 12) { 830 send_igmp(us, them, IGMP_DVMRP, DVMRP_NEIGHBORS2, 831 htonl(MROUTED_LEVEL), datalen); 832 p = (u_char *) (send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN); 833 datalen = 0; 834 } 835 *(u_int*)p = v->uv_lcl_addr; 836 p += 4; 837 *p++ = v->uv_metric; 838 *p++ = v->uv_threshold; 839 *p++ = rflags; 840 *p++ = 1; 841 *(u_int*)p = v->uv_rmt_addr; 842 p += 4; 843 datalen += 12; 844 } else { 845 for ( ; la; la = la->al_next) { 846 /* Make sure that there's room for this neighbor... */ 847 if (datalen + (ncount == 0 ? 4+4+4 : 4) > MAX_DVMRP_DATA_LEN) { 848 send_igmp(us, them, IGMP_DVMRP, DVMRP_NEIGHBORS2, 849 htonl(MROUTED_LEVEL), datalen); 850 p = (u_char *) (send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN); 851 datalen = 0; 852 ncount = 0; 853 } 854 /* Put out the header for this neighbor list... */ 855 if (ncount == 0) { 856 *(u_int*)p = v->uv_lcl_addr; 857 p += 4; 858 *p++ = v->uv_metric; 859 *p++ = v->uv_threshold; 860 *p++ = rflags; 861 ncount = p; 862 *p++ = 0; 863 datalen += 4 + 4; 864 } 865 *(u_int*)p = la->al_addr; 866 p += 4; 867 datalen += 4; 868 (*ncount)++; 869 } 870 } 871 } 872 if (datalen != 0) 873 send_igmp(us, them, IGMP_DVMRP, DVMRP_NEIGHBORS2, htonl(MROUTED_LEVEL), 874 datalen); 875 } 876 877 void 878 accept_info_request(u_int32_t src, u_int32_t dst, u_char *p, int datalen) 879 { 880 u_char *q; 881 int len; 882 int outlen = 0; 883 884 q = (u_char *) (send_buf + MIN_IP_HEADER_LEN + IGMP_MINLEN); 885 886 /* To be general, this must deal properly with breaking up over-sized 887 * packets. That implies passing a length to each function, and 888 * allowing each function to request to be called again. Right now, 889 * we're only implementing the one thing we are positive will fit into 890 * a single packet, so we wimp out. 891 */ 892 while (datalen > 0) { 893 len = 0; 894 switch (*p) { 895 case DVMRP_INFO_VERSION: 896 len = info_version(q, (u_char *)send_buf + RECV_BUF_SIZE - q); 897 break; 898 899 case DVMRP_INFO_NEIGHBORS: 900 default: 901 logit(LOG_INFO, 0, "ignoring unknown info type %d", *p); 902 break; 903 } 904 *(q+1) = len++; 905 outlen += len * 4; 906 q += len * 4; 907 len = (*(p+1) + 1) * 4; 908 p += len; 909 datalen -= len; 910 } 911 912 if (outlen != 0) 913 send_igmp(INADDR_ANY, src, IGMP_DVMRP, DVMRP_INFO_REPLY, 914 htonl(MROUTED_LEVEL), outlen); 915 } 916 917 /* 918 * Information response -- return version string 919 */ 920 static int 921 info_version(char *p, int len) 922 { 923 extern char versionstring[]; 924 925 if (len < 5) 926 return (0); 927 *p++ = DVMRP_INFO_VERSION; 928 p++; /* skip over length */ 929 *p++ = 0; /* zero out */ 930 *p++ = 0; /* reserved fields */ 931 strlcpy(p, versionstring, len - 4); 932 933 len = strlen(p); 934 return ((len + 3) / 4); 935 } 936 937 /* 938 * Process an incoming neighbor-list message. 939 */ 940 void 941 accept_neighbors(u_int32_t src, u_int32_t dst, u_char *p, int datalen, 942 u_int32_t level) 943 { 944 logit(LOG_INFO, 0, "ignoring spurious DVMRP neighbor list from %s to %s", 945 inet_fmt(src, s1), inet_fmt(dst, s2)); 946 } 947 948 949 /* 950 * Process an incoming neighbor-list message. 951 */ 952 void 953 accept_neighbors2(u_int32_t src, u_int32_t dst, u_char *p, int datalen, 954 u_int32_t level) 955 { 956 logit(LOG_INFO, 0, "ignoring spurious DVMRP neighbor list2 from %s to %s", 957 inet_fmt(src, s1), inet_fmt(dst, s2)); 958 } 959 960 /* 961 * Process an incoming info reply message. 962 */ 963 void 964 accept_info_reply(u_int32_t src, u_int32_t dst, u_char *p, int datalen) 965 { 966 logit(LOG_INFO, 0, "ignoring spurious DVMRP info reply from %s to %s", 967 inet_fmt(src, s1), inet_fmt(dst, s2)); 968 } 969 970 971 /* 972 * Update the neighbor entry for neighbor 'addr' on vif 'vifi'. 973 * 'msgtype' is the type of DVMRP message received from the neighbor. 974 * Return TRUE if 'addr' is a valid neighbor, FALSE otherwise. 975 */ 976 int 977 update_neighbor(vifi_t vifi, u_int32_t addr, int msgtype, char *p, 978 int datalen, u_int32_t level) 979 { 980 struct uvif *v; 981 struct listaddr *n; 982 u_int32_t genid = 0; 983 u_int32_t router; 984 u_int32_t send_tables = 0; 985 int do_reset = FALSE; 986 int nflags; 987 988 v = &uvifs[vifi]; 989 nflags = (level >> 16) & 0xff; 990 991 /* 992 * Confirm that 'addr' is a valid neighbor address on vif 'vifi'. 993 * IT IS ASSUMED that this was preceded by a call to find_vif(), which 994 * checks that 'addr' is either a valid remote tunnel endpoint or a 995 * non-broadcast address belonging to a directly-connected subnet. 996 * Therefore, here we check only that 'addr' is not our own address 997 * (due to an impostor or erroneous loopback) or an address of the form 998 * {subnet,0} ("the unknown host"). These checks are not performed in 999 * find_vif() because those types of address are acceptable for some 1000 * types of IGMP message (such as group membership reports). 1001 */ 1002 if (!(v->uv_flags & VIFF_TUNNEL) && 1003 (addr == v->uv_lcl_addr || 1004 addr == v->uv_subnet )) { 1005 logit(LOG_WARNING, 0, 1006 "received DVMRP message from 'the unknown host' or self: %s", 1007 inet_fmt(addr, s1)); 1008 return (FALSE); 1009 } 1010 1011 /* 1012 * Look for addr in list of neighbors. 1013 */ 1014 for (n = v->uv_neighbors; n != NULL; n = n->al_next) { 1015 if (addr == n->al_addr) { 1016 break; 1017 } 1018 } 1019 1020 /* 1021 * Found it. Reset its timer, and check for a version change 1022 */ 1023 if (n) { 1024 n->al_timer = 0; 1025 1026 /* 1027 * update the neighbors version and protocol number 1028 * if changed => router went down and came up, 1029 * so take action immediately. 1030 */ 1031 if ((n->al_pv != (level & 0xff)) || 1032 (n->al_mv != ((level >> 8) & 0xff))) { 1033 1034 do_reset = TRUE; 1035 logit(LOG_DEBUG, 0, 1036 "version change neighbor %s [old:%d.%d, new:%d.%d]", 1037 inet_fmt(addr, s1), 1038 n->al_pv, n->al_mv, level&0xff, (level >> 8) & 0xff); 1039 1040 n->al_pv = level & 0xff; 1041 n->al_mv = (level >> 8) & 0xff; 1042 } 1043 } else { 1044 /* 1045 * If not found, add it to the list. If the neighbor has a lower 1046 * IP address than me, yield querier duties to it. 1047 */ 1048 logit(LOG_DEBUG, 0, "New neighbor %s on vif %d v%d.%d nf 0x%02x", 1049 inet_fmt(addr, s1), vifi, level & 0xff, (level >> 8) & 0xff, 1050 (level >> 16) & 0xff); 1051 1052 n = malloc(sizeof(struct listaddr)); 1053 if (n == NULL) 1054 logit(LOG_ERR, 0, "ran out of memory"); /* fatal */ 1055 1056 n->al_addr = addr; 1057 n->al_pv = level & 0xff; 1058 n->al_mv = (level >> 8) & 0xff; 1059 n->al_genid = 0; 1060 1061 time(&n->al_ctime); 1062 n->al_timer = 0; 1063 n->al_next = v->uv_neighbors; 1064 1065 /* 1066 * If we thought that we had no neighbors on this vif, send a route 1067 * report to the vif. If this is just a new neighbor on the same 1068 * vif, send the route report just to the new neighbor. 1069 */ 1070 if (v->uv_neighbors == NULL) { 1071 send_tables = (v->uv_flags & VIFF_TUNNEL) ? addr : dvmrp_group; 1072 vifs_with_neighbors++; 1073 } else { 1074 send_tables = addr; 1075 } 1076 1077 v->uv_neighbors = n; 1078 1079 if (!(v->uv_flags & VIFF_TUNNEL) && 1080 ntohl(addr) < ntohl(v->uv_lcl_addr)) 1081 v->uv_flags &= ~VIFF_QUERIER; 1082 } 1083 1084 /* 1085 * Check if the router gen-ids are the same. 1086 * Need to reset the prune state of the router if not. 1087 * Also check for one-way interfaces by seeing if we are in our 1088 * neighbor's list of known routers. 1089 */ 1090 if (msgtype == DVMRP_PROBE) { 1091 1092 /* Check genid neighbor flag. Also check version number; 3.3 and 1093 * 3.4 didn't set this flag. */ 1094 if ((((level >> 16) & 0xff) & NF_GENID) || 1095 (((level & 0xff) == 3) && (((level >> 8) & 0xff) > 2))) { 1096 1097 int i; 1098 1099 if (datalen < 4) { 1100 logit(LOG_WARNING, 0, 1101 "received truncated probe message from %s (len %d)", 1102 inet_fmt(addr, s1), datalen); 1103 return (FALSE); 1104 } 1105 1106 for (i = 0; i < 4; i++) 1107 ((char *)&genid)[i] = *p++; 1108 datalen -= 4; 1109 1110 if (n->al_genid == 0) 1111 n->al_genid = genid; 1112 else if (n->al_genid != genid) { 1113 logit(LOG_DEBUG, 0, 1114 "new genid neigbor %s on vif %d [old:%x, new:%x]", 1115 inet_fmt(addr, s1), vifi, n->al_genid, genid); 1116 1117 n->al_genid = genid; 1118 do_reset = TRUE; 1119 } 1120 1121 /* 1122 * loop through router list and check for one-way ifs. 1123 */ 1124 1125 v->uv_flags |= VIFF_ONEWAY; 1126 1127 while (datalen > 0) { 1128 if (datalen < 4) { 1129 logit(LOG_WARNING, 0, 1130 "received truncated probe message from %s (len %d)", 1131 inet_fmt(addr, s1), datalen); 1132 return (FALSE); 1133 } 1134 for (i = 0; i < 4; i++) 1135 ((char *)&router)[i] = *p++; 1136 datalen -= 4; 1137 if (router == v->uv_lcl_addr) { 1138 v->uv_flags &= ~VIFF_ONEWAY; 1139 break; 1140 } 1141 } 1142 } 1143 } 1144 if (n->al_flags != nflags) { 1145 n->al_flags = nflags; 1146 1147 if (n->al_flags & NF_LEAF) { 1148 /*XXX If we have non-leaf neighbors then we know we shouldn't 1149 * mark this vif as a leaf. For now we just count on other 1150 * probes and/or reports resetting the timer. */ 1151 if (!v->uv_leaf_timer) 1152 v->uv_leaf_timer = LEAF_CONFIRMATION_TIME; 1153 } else { 1154 /* If we get a leaf to non-leaf transition, we *must* update 1155 * the routing table. */ 1156 if (v->uv_flags & VIFF_LEAF && send_tables == 0) 1157 send_tables = addr; 1158 v->uv_flags &= ~VIFF_LEAF; 1159 v->uv_leaf_timer = 0; 1160 } 1161 } 1162 if (do_reset) { 1163 reset_neighbor_state(vifi, addr); 1164 if (!send_tables) 1165 send_tables = addr; 1166 } 1167 if (send_tables) 1168 report(ALL_ROUTES, vifi, send_tables); 1169 1170 return (TRUE); 1171 } 1172 1173 1174 /* 1175 * On every timer interrupt, advance the timer in each neighbor and 1176 * group entry on every vif. 1177 */ 1178 void 1179 age_vifs(void) 1180 { 1181 vifi_t vifi; 1182 struct uvif *v; 1183 struct listaddr *a, *prev_a, *n; 1184 u_int32_t addr; 1185 1186 for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v ) { 1187 if (v->uv_leaf_timer && (v->uv_leaf_timer -= TIMER_INTERVAL == 0)) { 1188 v->uv_flags |= VIFF_LEAF; 1189 } 1190 1191 for (prev_a = (struct listaddr *)&(v->uv_neighbors), 1192 a = v->uv_neighbors; 1193 a != NULL; 1194 prev_a = a, a = a->al_next) { 1195 1196 if ((a->al_timer += TIMER_INTERVAL) < NEIGHBOR_EXPIRE_TIME) 1197 continue; 1198 1199 /* 1200 * Neighbor has expired; delete it from the neighbor list, 1201 * delete it from the 'dominants' and 'subordinates arrays of 1202 * any route entries and assume querier duties unless there is 1203 * another neighbor with a lower IP address than mine. 1204 */ 1205 addr = a->al_addr; 1206 prev_a->al_next = a->al_next; 1207 free((char *)a); 1208 a = prev_a; 1209 1210 delete_neighbor_from_routes(addr, vifi); 1211 1212 if (v->uv_neighbors == NULL) 1213 vifs_with_neighbors--; 1214 1215 v->uv_leaf_timer = LEAF_CONFIRMATION_TIME; 1216 1217 if (!(v->uv_flags & VIFF_TUNNEL)) { 1218 v->uv_flags |= VIFF_QUERIER; 1219 for (n = v->uv_neighbors; n != NULL; n = n->al_next) { 1220 if (ntohl(n->al_addr) < ntohl(v->uv_lcl_addr)) { 1221 v->uv_flags &= ~VIFF_QUERIER; 1222 } 1223 if (!(n->al_flags & NF_LEAF)) { 1224 v->uv_leaf_timer = 0; 1225 } 1226 } 1227 } 1228 } 1229 } 1230 } 1231 1232 /* 1233 * Returns the neighbor info struct for a given neighbor 1234 */ 1235 struct listaddr * 1236 neighbor_info(vifi_t vifi, u_int32_t addr) 1237 { 1238 struct listaddr *u; 1239 1240 for (u = uvifs[vifi].uv_neighbors; u; u = u->al_next) 1241 if (u->al_addr == addr) 1242 return u; 1243 1244 return NULL; 1245 } 1246 1247 /* 1248 * Print the contents of the uvifs array on file 'fp'. 1249 */ 1250 void 1251 dump_vifs(FILE *fp) 1252 { 1253 vifi_t vifi; 1254 struct uvif *v; 1255 struct listaddr *a; 1256 struct phaddr *p; 1257 struct sioc_vif_req v_req; 1258 1259 fprintf(fp, "vifs_with_neighbors = %d\n", vifs_with_neighbors); 1260 1261 if (vifs_with_neighbors == 1) 1262 fprintf(fp,"[This host is a leaf]\n\n"); 1263 1264 fprintf(fp, 1265 "\nVirtual Interface Table\n%s", 1266 "Vif Name Local-Address "); 1267 fprintf(fp, 1268 "M Thr Rate Flags\n"); 1269 1270 for (vifi = 0, v = uvifs; vifi < numvifs; vifi++, v++) { 1271 1272 fprintf(fp, "%2u %6s %-15s %6s: %-18s %2u %3u %5u ", 1273 vifi, 1274 v->uv_name, 1275 inet_fmt(v->uv_lcl_addr, s1), 1276 (v->uv_flags & VIFF_TUNNEL) ? 1277 "tunnel": 1278 "subnet", 1279 (v->uv_flags & VIFF_TUNNEL) ? 1280 inet_fmt(v->uv_rmt_addr, s2) : 1281 inet_fmts(v->uv_subnet, v->uv_subnetmask, s3), 1282 v->uv_metric, 1283 v->uv_threshold, 1284 v->uv_rate_limit); 1285 1286 if (v->uv_flags & VIFF_ONEWAY) fprintf(fp, " one-way"); 1287 if (v->uv_flags & VIFF_DOWN) fprintf(fp, " down"); 1288 if (v->uv_flags & VIFF_DISABLED) fprintf(fp, " disabled"); 1289 if (v->uv_flags & VIFF_QUERIER) fprintf(fp, " querier"); 1290 if (v->uv_flags & VIFF_SRCRT) fprintf(fp, " src-rt"); 1291 if (v->uv_flags & VIFF_LEAF) fprintf(fp, " leaf"); 1292 if (v->uv_flags & VIFF_IGMPV1) fprintf(fp, " IGMPv1"); 1293 fprintf(fp, "\n"); 1294 1295 if (v->uv_addrs != NULL) { 1296 fprintf(fp, " alternate subnets: %s\n", 1297 inet_fmts(v->uv_addrs->pa_subnet, v->uv_addrs->pa_subnetmask, s1)); 1298 for (p = v->uv_addrs->pa_next; p; p = p->pa_next) { 1299 fprintf(fp, " %s\n", 1300 inet_fmts(p->pa_subnet, p->pa_subnetmask, s1)); 1301 } 1302 } 1303 1304 if (v->uv_neighbors != NULL) { 1305 fprintf(fp, " peers: %s (%d.%d) (0x%x)\n", 1306 inet_fmt(v->uv_neighbors->al_addr, s1), 1307 v->uv_neighbors->al_pv, v->uv_neighbors->al_mv, 1308 v->uv_neighbors->al_flags); 1309 for (a = v->uv_neighbors->al_next; a != NULL; a = a->al_next) { 1310 fprintf(fp, " %s (%d.%d) (0x%x)\n", 1311 inet_fmt(a->al_addr, s1), a->al_pv, a->al_mv, 1312 a->al_flags); 1313 } 1314 } 1315 1316 if (v->uv_groups != NULL) { 1317 fprintf(fp, " groups: %-15s\n", 1318 inet_fmt(v->uv_groups->al_addr, s1)); 1319 for (a = v->uv_groups->al_next; a != NULL; a = a->al_next) { 1320 fprintf(fp, " %-15s\n", 1321 inet_fmt(a->al_addr, s1)); 1322 } 1323 } 1324 if (v->uv_acl != NULL) { 1325 struct vif_acl *acl; 1326 1327 fprintf(fp, " boundaries: %-18s\n", 1328 inet_fmts(v->uv_acl->acl_addr, v->uv_acl->acl_mask, s1)); 1329 for (acl = v->uv_acl->acl_next; acl != NULL; acl = acl->acl_next) { 1330 fprintf(fp, " : %-18s\n", 1331 inet_fmts(acl->acl_addr, acl->acl_mask, s1)); 1332 } 1333 } 1334 v_req.vifi = vifi; 1335 if (ioctl(udp_socket, SIOCGETVIFCNT, (char *)&v_req) < 0) { 1336 logit(LOG_WARNING, 0, 1337 "SIOCGETVIFCNT fails"); 1338 } 1339 else { 1340 fprintf(fp, " pkts in : %ld\n", 1341 v_req.icount); 1342 fprintf(fp, " pkts out: %ld\n", 1343 v_req.ocount); 1344 } 1345 fprintf(fp, "\n"); 1346 } 1347 fprintf(fp, "\n"); 1348 } 1349 1350 /* 1351 * Time out record of a group membership on a vif 1352 */ 1353 static void 1354 DelVif(void *arg) 1355 { 1356 cbk_t *cbk = (cbk_t *)arg; 1357 vifi_t vifi = cbk->vifi; 1358 struct uvif *v = &uvifs[vifi]; 1359 struct listaddr *a, **anp, *g = cbk->g; 1360 1361 /* 1362 * Group has expired 1363 * delete all kernel cache entries with this group 1364 */ 1365 if (g->al_query) 1366 DeleteTimer(g->al_query); 1367 1368 delete_lclgrp(vifi, g->al_addr); 1369 1370 anp = &(v->uv_groups); 1371 while ((a = *anp) != NULL) { 1372 if (a == g) { 1373 *anp = a->al_next; 1374 free((char *)a); 1375 } else { 1376 anp = &a->al_next; 1377 } 1378 } 1379 1380 free(cbk); 1381 } 1382 1383 /* 1384 * Set a timer to delete the record of a group membership on a vif. 1385 */ 1386 static int 1387 SetTimer(int vifi, struct listaddr *g) 1388 { 1389 cbk_t *cbk; 1390 1391 cbk = malloc(sizeof(cbk_t)); 1392 cbk->g = g; 1393 cbk->vifi = vifi; 1394 return timer_setTimer(g->al_timer, (cfunc_t)DelVif, (void *)cbk); 1395 } 1396 1397 /* 1398 * Delete a timer that was set above. 1399 */ 1400 static int 1401 DeleteTimer(int id) 1402 { 1403 timer_clearTimer(id); 1404 return 0; 1405 } 1406 1407 /* 1408 * Send a group-specific query. 1409 */ 1410 static void 1411 SendQuery(void *arg) 1412 { 1413 cbk_t *cbk = (cbk_t *)arg; 1414 struct uvif *v = &uvifs[cbk->vifi]; 1415 1416 send_igmp(v->uv_lcl_addr, cbk->g->al_addr, 1417 IGMP_HOST_MEMBERSHIP_QUERY, 1418 cbk->q_time, cbk->g->al_addr, 0); 1419 cbk->g->al_query = 0; 1420 free(cbk); 1421 } 1422 1423 /* 1424 * Set a timer to send a group-specific query. 1425 */ 1426 static int 1427 SetQueryTimer(struct listaddr *g, vifi_t vifi, int to_expire, int q_time) 1428 { 1429 cbk_t *cbk; 1430 1431 cbk = malloc(sizeof(cbk_t)); 1432 cbk->g = g; 1433 cbk->q_time = q_time; 1434 cbk->vifi = vifi; 1435 return timer_setTimer(to_expire, (cfunc_t)SendQuery, (void *)cbk); 1436 } 1437