Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netgraph/ng_bridge.c
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1 /*- 2 * Copyright (c) 2000 Whistle Communications, Inc. 3 * All rights reserved. 4 * 5 * Subject to the following obligations and disclaimer of warranty, use and 6 * redistribution of this software, in source or object code forms, with or 7 * without modifications are expressly permitted by Whistle Communications; 8 * provided, however, that: 9 * 1. Any and all reproductions of the source or object code must include the 10 * copyright notice above and the following disclaimer of warranties; and 11 * 2. No rights are granted, in any manner or form, to use Whistle 12 * Communications, Inc. trademarks, including the mark "WHISTLE 13 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 14 * such appears in the above copyright notice or in the software. 15 * 16 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 17 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 18 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 19 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 21 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 22 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 23 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 24 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 25 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 26 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 27 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 28 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 32 * OF SUCH DAMAGE. 33 * 34 * Author: Archie Cobbs <archie@freebsd.org> 35 * 36 * $FreeBSD$ 37 */ 38 39 /* 40 * ng_bridge(4) netgraph node type 41 * 42 * The node performs standard intelligent Ethernet bridging over 43 * each of its connected hooks, or links. A simple loop detection 44 * algorithm is included which disables a link for priv->conf.loopTimeout 45 * seconds when a host is seen to have jumped from one link to 46 * another within priv->conf.minStableAge seconds. 47 * 48 * We keep a hashtable that maps Ethernet addresses to host info, 49 * which is contained in struct ng_bridge_host's. These structures 50 * tell us on which link the host may be found. A host's entry will 51 * expire after priv->conf.maxStaleness seconds. 52 * 53 * This node is optimzed for stable networks, where machines jump 54 * from one port to the other only rarely. 55 */ 56 57 #include <sys/param.h> 58 #include <sys/systm.h> 59 #include <sys/kernel.h> 60 #include <sys/lock.h> 61 #include <sys/malloc.h> 62 #include <sys/mbuf.h> 63 #include <sys/errno.h> 64 #include <sys/rwlock.h> 65 #include <sys/syslog.h> 66 #include <sys/socket.h> 67 #include <sys/ctype.h> 68 #include <sys/types.h> 69 #include <sys/counter.h> 70 71 #include <net/if.h> 72 #include <net/if_var.h> 73 #include <net/ethernet.h> 74 #include <net/vnet.h> 75 76 #include <netinet/in.h> 77 #if 0 /* not used yet */ 78 #include <netinet/ip_fw.h> 79 #endif 80 #include <netgraph/ng_message.h> 81 #include <netgraph/netgraph.h> 82 #include <netgraph/ng_parse.h> 83 #include <netgraph/ng_bridge.h> 84 85 #ifdef NG_SEPARATE_MALLOC 86 static MALLOC_DEFINE(M_NETGRAPH_BRIDGE, "netgraph_bridge", 87 "netgraph bridge node"); 88 #else 89 #define M_NETGRAPH_BRIDGE M_NETGRAPH 90 #endif 91 92 /* Counter based stats */ 93 struct ng_bridge_link_kernel_stats { 94 counter_u64_t recvOctets; /* total octets rec'd on link */ 95 counter_u64_t recvPackets; /* total pkts rec'd on link */ 96 counter_u64_t recvMulticasts; /* multicast pkts rec'd on link */ 97 counter_u64_t recvBroadcasts; /* broadcast pkts rec'd on link */ 98 counter_u64_t recvUnknown; /* pkts rec'd with unknown dest addr */ 99 counter_u64_t recvRunts; /* pkts rec'd less than 14 bytes */ 100 counter_u64_t recvInvalid; /* pkts rec'd with bogus source addr */ 101 counter_u64_t xmitOctets; /* total octets xmit'd on link */ 102 counter_u64_t xmitPackets; /* total pkts xmit'd on link */ 103 counter_u64_t xmitMulticasts; /* multicast pkts xmit'd on link */ 104 counter_u64_t xmitBroadcasts; /* broadcast pkts xmit'd on link */ 105 counter_u64_t loopDrops; /* pkts dropped due to loopback */ 106 u_int64_t loopDetects; /* number of loop detections */ 107 counter_u64_t memoryFailures; /* times couldn't get mem or mbuf */ 108 }; 109 110 /* Per-link private data */ 111 struct ng_bridge_link { 112 hook_p hook; /* netgraph hook */ 113 u_int16_t loopCount; /* loop ignore timer */ 114 unsigned int learnMac : 1, /* autolearn macs */ 115 sendUnknown : 1;/* send unknown macs out */ 116 struct ng_bridge_link_kernel_stats stats; /* link stats */ 117 }; 118 typedef struct ng_bridge_link const *link_cp; /* read only access */ 119 120 /* Per-node private data */ 121 struct ng_bridge_private { 122 struct ng_bridge_bucket *tab; /* hash table bucket array */ 123 struct ng_bridge_config conf; /* node configuration */ 124 node_p node; /* netgraph node */ 125 u_int numHosts; /* num entries in table */ 126 u_int numBuckets; /* num buckets in table */ 127 u_int hashMask; /* numBuckets - 1 */ 128 int numLinks; /* num connected links */ 129 unsigned int persistent : 1, /* can exist w/o hooks */ 130 sendUnknown : 1;/* links receive unknowns by default */ 131 struct callout timer; /* one second periodic timer */ 132 }; 133 typedef struct ng_bridge_private *priv_p; 134 typedef struct ng_bridge_private const *priv_cp; /* read only access */ 135 136 /* Information about a host, stored in a hash table entry */ 137 struct ng_bridge_host { 138 u_char addr[6]; /* ethernet address */ 139 link_p link; /* link where addr can be found */ 140 u_int16_t age; /* seconds ago entry was created */ 141 u_int16_t staleness; /* seconds ago host last heard from */ 142 SLIST_ENTRY(ng_bridge_host) next; /* next entry in bucket */ 143 }; 144 145 /* Hash table bucket declaration */ 146 SLIST_HEAD(ng_bridge_bucket, ng_bridge_host); 147 148 /* Netgraph node methods */ 149 static ng_constructor_t ng_bridge_constructor; 150 static ng_rcvmsg_t ng_bridge_rcvmsg; 151 static ng_shutdown_t ng_bridge_shutdown; 152 static ng_newhook_t ng_bridge_newhook; 153 static ng_rcvdata_t ng_bridge_rcvdata; 154 static ng_disconnect_t ng_bridge_disconnect; 155 156 /* Other internal functions */ 157 static struct ng_bridge_host *ng_bridge_get(priv_cp priv, const u_char *addr); 158 static int ng_bridge_put(priv_p priv, const u_char *addr, link_p link); 159 static void ng_bridge_rehash(priv_p priv); 160 static void ng_bridge_remove_hosts(priv_p priv, link_p link); 161 static void ng_bridge_timeout(node_p node, hook_p hook, void *arg1, int arg2); 162 static const char *ng_bridge_nodename(node_cp node); 163 164 /* Ethernet broadcast */ 165 static const u_char ng_bridge_bcast_addr[ETHER_ADDR_LEN] = 166 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 167 168 /* Compare Ethernet addresses using 32 and 16 bit words instead of bytewise */ 169 #define ETHER_EQUAL(a,b) (((const u_int32_t *)(a))[0] \ 170 == ((const u_int32_t *)(b))[0] \ 171 && ((const u_int16_t *)(a))[2] \ 172 == ((const u_int16_t *)(b))[2]) 173 174 /* Minimum and maximum number of hash buckets. Must be a power of two. */ 175 #define MIN_BUCKETS (1 << 5) /* 32 */ 176 #define MAX_BUCKETS (1 << 14) /* 16384 */ 177 178 /* Configuration default values */ 179 #define DEFAULT_LOOP_TIMEOUT 60 180 #define DEFAULT_MAX_STALENESS (15 * 60) /* same as ARP timeout */ 181 #define DEFAULT_MIN_STABLE_AGE 1 182 183 /****************************************************************** 184 NETGRAPH PARSE TYPES 185 ******************************************************************/ 186 187 /* 188 * How to determine the length of the table returned by NGM_BRIDGE_GET_TABLE 189 */ 190 static int 191 ng_bridge_getTableLength(const struct ng_parse_type *type, 192 const u_char *start, const u_char *buf) 193 { 194 const struct ng_bridge_host_ary *const hary 195 = (const struct ng_bridge_host_ary *)(buf - sizeof(u_int32_t)); 196 197 return hary->numHosts; 198 } 199 200 /* Parse type for struct ng_bridge_host_ary */ 201 static const struct ng_parse_struct_field ng_bridge_host_type_fields[] 202 = NG_BRIDGE_HOST_TYPE_INFO(&ng_parse_enaddr_type); 203 static const struct ng_parse_type ng_bridge_host_type = { 204 &ng_parse_struct_type, 205 &ng_bridge_host_type_fields 206 }; 207 static const struct ng_parse_array_info ng_bridge_hary_type_info = { 208 &ng_bridge_host_type, 209 ng_bridge_getTableLength 210 }; 211 static const struct ng_parse_type ng_bridge_hary_type = { 212 &ng_parse_array_type, 213 &ng_bridge_hary_type_info 214 }; 215 static const struct ng_parse_struct_field ng_bridge_host_ary_type_fields[] 216 = NG_BRIDGE_HOST_ARY_TYPE_INFO(&ng_bridge_hary_type); 217 static const struct ng_parse_type ng_bridge_host_ary_type = { 218 &ng_parse_struct_type, 219 &ng_bridge_host_ary_type_fields 220 }; 221 222 /* Parse type for struct ng_bridge_config */ 223 static const struct ng_parse_struct_field ng_bridge_config_type_fields[] 224 = NG_BRIDGE_CONFIG_TYPE_INFO; 225 static const struct ng_parse_type ng_bridge_config_type = { 226 &ng_parse_struct_type, 227 &ng_bridge_config_type_fields 228 }; 229 230 /* Parse type for struct ng_bridge_link_stat */ 231 static const struct ng_parse_struct_field ng_bridge_stats_type_fields[] 232 = NG_BRIDGE_STATS_TYPE_INFO; 233 static const struct ng_parse_type ng_bridge_stats_type = { 234 &ng_parse_struct_type, 235 &ng_bridge_stats_type_fields 236 }; 237 /* Parse type for struct ng_bridge_move_host */ 238 static const struct ng_parse_struct_field ng_bridge_move_host_type_fields[] 239 = NG_BRIDGE_MOVE_HOST_TYPE_INFO(&ng_parse_enaddr_type); 240 static const struct ng_parse_type ng_bridge_move_host_type = { 241 &ng_parse_struct_type, 242 &ng_bridge_move_host_type_fields 243 }; 244 245 /* List of commands and how to convert arguments to/from ASCII */ 246 static const struct ng_cmdlist ng_bridge_cmdlist[] = { 247 { 248 NGM_BRIDGE_COOKIE, 249 NGM_BRIDGE_SET_CONFIG, 250 "setconfig", 251 &ng_bridge_config_type, 252 NULL 253 }, 254 { 255 NGM_BRIDGE_COOKIE, 256 NGM_BRIDGE_GET_CONFIG, 257 "getconfig", 258 NULL, 259 &ng_bridge_config_type 260 }, 261 { 262 NGM_BRIDGE_COOKIE, 263 NGM_BRIDGE_RESET, 264 "reset", 265 NULL, 266 NULL 267 }, 268 { 269 NGM_BRIDGE_COOKIE, 270 NGM_BRIDGE_GET_STATS, 271 "getstats", 272 &ng_parse_uint32_type, 273 &ng_bridge_stats_type 274 }, 275 { 276 NGM_BRIDGE_COOKIE, 277 NGM_BRIDGE_CLR_STATS, 278 "clrstats", 279 &ng_parse_uint32_type, 280 NULL 281 }, 282 { 283 NGM_BRIDGE_COOKIE, 284 NGM_BRIDGE_GETCLR_STATS, 285 "getclrstats", 286 &ng_parse_uint32_type, 287 &ng_bridge_stats_type 288 }, 289 { 290 NGM_BRIDGE_COOKIE, 291 NGM_BRIDGE_GET_TABLE, 292 "gettable", 293 NULL, 294 &ng_bridge_host_ary_type 295 }, 296 { 297 NGM_BRIDGE_COOKIE, 298 NGM_BRIDGE_SET_PERSISTENT, 299 "setpersistent", 300 NULL, 301 NULL 302 }, 303 { 304 NGM_BRIDGE_COOKIE, 305 NGM_BRIDGE_MOVE_HOST, 306 "movehost", 307 &ng_bridge_move_host_type, 308 NULL 309 }, 310 { 0 } 311 }; 312 313 /* Node type descriptor */ 314 static struct ng_type ng_bridge_typestruct = { 315 .version = NG_ABI_VERSION, 316 .name = NG_BRIDGE_NODE_TYPE, 317 .constructor = ng_bridge_constructor, 318 .rcvmsg = ng_bridge_rcvmsg, 319 .shutdown = ng_bridge_shutdown, 320 .newhook = ng_bridge_newhook, 321 .rcvdata = ng_bridge_rcvdata, 322 .disconnect = ng_bridge_disconnect, 323 .cmdlist = ng_bridge_cmdlist, 324 }; 325 NETGRAPH_INIT(bridge, &ng_bridge_typestruct); 326 327 /****************************************************************** 328 NETGRAPH NODE METHODS 329 ******************************************************************/ 330 331 /* 332 * Node constructor 333 */ 334 static int 335 ng_bridge_constructor(node_p node) 336 { 337 priv_p priv; 338 339 /* Allocate and initialize private info */ 340 priv = malloc(sizeof(*priv), M_NETGRAPH_BRIDGE, M_WAITOK | M_ZERO); 341 ng_callout_init(&priv->timer); 342 343 /* Allocate and initialize hash table, etc. */ 344 priv->tab = malloc(MIN_BUCKETS * sizeof(*priv->tab), 345 M_NETGRAPH_BRIDGE, M_WAITOK | M_ZERO); 346 priv->numBuckets = MIN_BUCKETS; 347 priv->hashMask = MIN_BUCKETS - 1; 348 priv->conf.debugLevel = 1; 349 priv->conf.loopTimeout = DEFAULT_LOOP_TIMEOUT; 350 priv->conf.maxStaleness = DEFAULT_MAX_STALENESS; 351 priv->conf.minStableAge = DEFAULT_MIN_STABLE_AGE; 352 priv->sendUnknown = 1; /* classic bridge */ 353 354 NG_NODE_SET_PRIVATE(node, priv); 355 priv->node = node; 356 357 /* Start timer; timer is always running while node is alive */ 358 ng_callout(&priv->timer, node, NULL, hz, ng_bridge_timeout, NULL, 0); 359 360 /* Done */ 361 return (0); 362 } 363 364 /* 365 * Method for attaching a new hook 366 */ 367 static int 368 ng_bridge_newhook(node_p node, hook_p hook, const char *name) 369 { 370 const priv_p priv = NG_NODE_PRIVATE(node); 371 char linkName[NG_HOOKSIZ]; 372 u_int32_t linkNum; 373 link_p link; 374 const char *prefix = NG_BRIDGE_HOOK_LINK_PREFIX; 375 bool isUplink; 376 377 /* Check for a link hook */ 378 if (strlen(name) <= strlen(prefix)) 379 return (EINVAL); /* Unknown hook name */ 380 381 isUplink = (name[0] == 'u'); 382 if (isUplink) 383 prefix = NG_BRIDGE_HOOK_UPLINK_PREFIX; 384 385 /* primitive parsing */ 386 linkNum = strtoul(name + strlen(prefix), NULL, 10); 387 /* validation by comparing against the reconstucted name */ 388 snprintf(linkName, sizeof(linkName), "%s%u", prefix, linkNum); 389 if (strcmp(linkName, name) != 0) 390 return (EINVAL); 391 392 if (linkNum == 0 && isUplink) 393 return (EINVAL); 394 395 if(NG_PEER_NODE(hook) == node) 396 return (ELOOP); 397 398 link = malloc(sizeof(*link), M_NETGRAPH_BRIDGE, M_WAITOK | M_ZERO); 399 400 link->stats.recvOctets = counter_u64_alloc(M_WAITOK); 401 link->stats.recvPackets = counter_u64_alloc(M_WAITOK); 402 link->stats.recvMulticasts = counter_u64_alloc(M_WAITOK); 403 link->stats.recvBroadcasts = counter_u64_alloc(M_WAITOK); 404 link->stats.recvUnknown = counter_u64_alloc(M_WAITOK); 405 link->stats.recvRunts = counter_u64_alloc(M_WAITOK); 406 link->stats.recvInvalid = counter_u64_alloc(M_WAITOK); 407 link->stats.xmitOctets = counter_u64_alloc(M_WAITOK); 408 link->stats.xmitPackets = counter_u64_alloc(M_WAITOK); 409 link->stats.xmitMulticasts = counter_u64_alloc(M_WAITOK); 410 link->stats.xmitBroadcasts = counter_u64_alloc(M_WAITOK); 411 link->stats.loopDrops = counter_u64_alloc(M_WAITOK); 412 link->stats.memoryFailures = counter_u64_alloc(M_WAITOK); 413 414 link->hook = hook; 415 if (isUplink) { 416 link->learnMac = 0; 417 link->sendUnknown = 1; 418 if (priv->numLinks == 0) /* if the first link is an uplink */ 419 priv->sendUnknown = 0; /* switch to restrictive mode */ 420 } else { 421 link->learnMac = 1; 422 link->sendUnknown = priv->sendUnknown; 423 } 424 425 NG_HOOK_SET_PRIVATE(hook, link); 426 priv->numLinks++; 427 return (0); 428 } 429 430 /* 431 * Receive a control message 432 */ 433 static void ng_bridge_clear_link_stats(struct ng_bridge_link_kernel_stats * p) 434 { 435 counter_u64_zero(p->recvOctets); 436 counter_u64_zero(p->recvPackets); 437 counter_u64_zero(p->recvMulticasts); 438 counter_u64_zero(p->recvBroadcasts); 439 counter_u64_zero(p->recvUnknown); 440 counter_u64_zero(p->recvRunts); 441 counter_u64_zero(p->recvInvalid); 442 counter_u64_zero(p->xmitOctets); 443 counter_u64_zero(p->xmitPackets); 444 counter_u64_zero(p->xmitMulticasts); 445 counter_u64_zero(p->xmitBroadcasts); 446 counter_u64_zero(p->loopDrops); 447 p->loopDetects = 0; 448 counter_u64_zero(p->memoryFailures); 449 }; 450 451 static int 452 ng_bridge_reset_link(hook_p hook, void *arg __unused) 453 { 454 link_p priv = NG_HOOK_PRIVATE(hook); 455 456 priv->loopCount = 0; 457 ng_bridge_clear_link_stats(&priv->stats); 458 return (1); 459 } 460 461 462 static int 463 ng_bridge_rcvmsg(node_p node, item_p item, hook_p lasthook) 464 { 465 const priv_p priv = NG_NODE_PRIVATE(node); 466 struct ng_mesg *resp = NULL; 467 int error = 0; 468 struct ng_mesg *msg; 469 470 NGI_GET_MSG(item, msg); 471 switch (msg->header.typecookie) { 472 #ifdef NGM_BRIDGE_TABLE_ABI 473 case NGM_BRIDGE_COOKIE_TBL: 474 switch (msg->header.cmd) { 475 case NGM_BRIDGE_GET_CONFIG: 476 { 477 struct ng_bridge_config_tbl *conf; 478 479 NG_MKRESPONSE(resp, msg, sizeof(*conf), 480 M_NOWAIT|M_ZERO); 481 if (resp == NULL) { 482 error = ENOMEM; 483 break; 484 } 485 conf = (struct ng_bridge_config_tbl *)resp->data; 486 conf->cfg = priv->conf; 487 break; 488 } 489 case NGM_BRIDGE_SET_CONFIG: 490 { 491 struct ng_bridge_config_tbl *conf; 492 493 if (msg->header.arglen != sizeof(*conf)) { 494 error = EINVAL; 495 break; 496 } 497 conf = (struct ng_bridge_config_tbl *)msg->data; 498 priv->conf = conf->cfg; 499 break; 500 } 501 case NGM_BRIDGE_GET_TABLE: 502 { 503 struct ng_bridge_host_tbl_ary *ary; 504 struct ng_bridge_host *host; 505 int i, bucket; 506 507 NG_MKRESPONSE(resp, msg, sizeof(*ary) + 508 (priv->numHosts * sizeof(*ary->hosts)), M_NOWAIT); 509 if (resp == NULL) { 510 error = ENOMEM; 511 break; 512 } 513 ary = (struct ng_bridge_host_tbl_ary *)resp->data; 514 ary->numHosts = priv->numHosts; 515 i = 0; 516 for (bucket = 0; bucket < priv->numBuckets; bucket++) { 517 SLIST_FOREACH(host, &priv->tab[bucket], next) { 518 const char *name = NG_HOOK_NAME(host->link->hook); 519 const char *prefix = name[0] == 'u' ? 520 NG_BRIDGE_HOOK_UPLINK_PREFIX : 521 NG_BRIDGE_HOOK_LINK_PREFIX; 522 523 memcpy(ary->hosts[i].addr, host->addr, 524 sizeof(ary->hosts[i].addr)); 525 ary->hosts[i].age = host->age; 526 ary->hosts[i].staleness = host->staleness; 527 ary->hosts[i].linkNum = strtol( 528 name + strlen(prefix), NULL, 10); 529 i++; 530 } 531 } 532 break; 533 } 534 } 535 /* If already handled break, otherwise use new ABI. */ 536 if (resp != NULL || error != 0) 537 break; 538 #endif /* NGM_BRIDGE_TABLE_ABI */ 539 case NGM_BRIDGE_COOKIE: 540 switch (msg->header.cmd) { 541 case NGM_BRIDGE_GET_CONFIG: 542 { 543 struct ng_bridge_config *conf; 544 545 NG_MKRESPONSE(resp, msg, 546 sizeof(struct ng_bridge_config), M_NOWAIT); 547 if (resp == NULL) { 548 error = ENOMEM; 549 break; 550 } 551 conf = (struct ng_bridge_config *)resp->data; 552 *conf = priv->conf; /* no sanity checking needed */ 553 break; 554 } 555 case NGM_BRIDGE_SET_CONFIG: 556 { 557 struct ng_bridge_config *conf; 558 559 if (msg->header.arglen 560 != sizeof(struct ng_bridge_config)) { 561 error = EINVAL; 562 break; 563 } 564 conf = (struct ng_bridge_config *)msg->data; 565 priv->conf = *conf; 566 break; 567 } 568 case NGM_BRIDGE_RESET: 569 { 570 hook_p rethook; 571 572 /* Flush all entries in the hash table */ 573 ng_bridge_remove_hosts(priv, NULL); 574 575 /* Reset all loop detection counters and stats */ 576 NG_NODE_FOREACH_HOOK(node, ng_bridge_reset_link, NULL, 577 rethook); 578 break; 579 } 580 case NGM_BRIDGE_GET_STATS: 581 case NGM_BRIDGE_CLR_STATS: 582 case NGM_BRIDGE_GETCLR_STATS: 583 { 584 hook_p hook; 585 link_p link; 586 char linkName[NG_HOOKSIZ]; 587 int linkNum; 588 589 /* Get link number */ 590 if (msg->header.arglen != sizeof(u_int32_t)) { 591 error = EINVAL; 592 break; 593 } 594 linkNum = *((int32_t *)msg->data); 595 if (linkNum < 0) 596 snprintf(linkName, sizeof(linkName), 597 "%s%u", NG_BRIDGE_HOOK_UPLINK_PREFIX, -linkNum); 598 else 599 snprintf(linkName, sizeof(linkName), 600 "%s%u", NG_BRIDGE_HOOK_LINK_PREFIX, linkNum); 601 602 if ((hook = ng_findhook(node, linkName)) == NULL) { 603 error = ENOTCONN; 604 break; 605 } 606 link = NG_HOOK_PRIVATE(hook); 607 608 /* Get/clear stats */ 609 if (msg->header.cmd != NGM_BRIDGE_CLR_STATS) { 610 struct ng_bridge_link_stats *rs; 611 612 NG_MKRESPONSE(resp, msg, 613 sizeof(link->stats), M_NOWAIT); 614 if (resp == NULL) { 615 error = ENOMEM; 616 break; 617 } 618 rs = (struct ng_bridge_link_stats *)resp->data; 619 #define FETCH(x) rs->x = counter_u64_fetch(link->stats.x) 620 FETCH(recvOctets); 621 FETCH(recvPackets); 622 FETCH(recvMulticasts); 623 FETCH(recvBroadcasts); 624 FETCH(recvUnknown); 625 FETCH(recvRunts); 626 FETCH(recvInvalid); 627 FETCH(xmitOctets); 628 FETCH(xmitPackets); 629 FETCH(xmitMulticasts); 630 FETCH(xmitBroadcasts); 631 FETCH(loopDrops); 632 rs->loopDetects = link->stats.loopDetects; 633 FETCH(memoryFailures); 634 #undef FETCH 635 } 636 if (msg->header.cmd != NGM_BRIDGE_GET_STATS) 637 ng_bridge_clear_link_stats(&link->stats); 638 break; 639 } 640 case NGM_BRIDGE_GET_TABLE: 641 { 642 struct ng_bridge_host_ary *ary; 643 struct ng_bridge_host *host; 644 int i = 0, bucket; 645 646 NG_MKRESPONSE(resp, msg, sizeof(*ary) 647 + (priv->numHosts * sizeof(*ary->hosts)), M_NOWAIT); 648 if (resp == NULL) { 649 error = ENOMEM; 650 break; 651 } 652 ary = (struct ng_bridge_host_ary *)resp->data; 653 ary->numHosts = priv->numHosts; 654 for (bucket = 0; bucket < priv->numBuckets; bucket++) { 655 SLIST_FOREACH(host, &priv->tab[bucket], next) { 656 memcpy(ary->hosts[i].addr, 657 host->addr, 658 sizeof(ary->hosts[i].addr)); 659 ary->hosts[i].age = host->age; 660 ary->hosts[i].staleness = host->staleness; 661 strncpy(ary->hosts[i].hook, 662 NG_HOOK_NAME(host->link->hook), 663 sizeof(ary->hosts[i].hook)); 664 i++; 665 } 666 } 667 break; 668 } 669 case NGM_BRIDGE_SET_PERSISTENT: 670 { 671 priv->persistent = 1; 672 break; 673 } 674 case NGM_BRIDGE_MOVE_HOST: 675 { 676 struct ng_bridge_move_host *mh; 677 hook_p hook; 678 679 if (msg->header.arglen < sizeof(*mh)) { 680 error = EINVAL; 681 break; 682 } 683 mh = (struct ng_bridge_move_host *)msg->data; 684 hook = (mh->hook[0] == 0) 685 ? lasthook 686 : ng_findhook(node, mh->hook); 687 if (hook == NULL) { 688 error = ENOENT; 689 break; 690 } 691 error = ng_bridge_put(priv, mh->addr, NG_HOOK_PRIVATE(hook)); 692 break; 693 } 694 default: 695 error = EINVAL; 696 break; 697 } 698 break; 699 default: 700 error = EINVAL; 701 break; 702 } 703 704 /* Done */ 705 NG_RESPOND_MSG(error, node, item, resp); 706 NG_FREE_MSG(msg); 707 return (error); 708 } 709 710 /* 711 * Receive data on a hook 712 */ 713 struct ng_bridge_send_ctx { 714 link_p foundFirst, incoming; 715 struct mbuf * m; 716 int manycast, error; 717 }; 718 719 /* 720 * Update stats and send out 721 */ 722 static inline int 723 ng_bridge_send_data(link_cp dst, int manycast, struct mbuf *m, item_p item) { 724 int error = 0; 725 size_t len = m->m_pkthdr.len; 726 727 if(item != NULL) 728 NG_FWD_NEW_DATA(error, item, dst->hook, m); 729 else 730 NG_SEND_DATA_ONLY(error, dst->hook, m); 731 732 if (error) { 733 /* The packet is still ours */ 734 if (item != NULL) 735 NG_FREE_ITEM(item); 736 if (m != NULL) 737 NG_FREE_M(m); 738 return (error); 739 } 740 741 counter_u64_add(dst->stats.xmitPackets, 1); 742 counter_u64_add(dst->stats.xmitOctets, len); 743 switch (manycast) { 744 default: /* unknown unicast */ 745 break; 746 case 1: /* multicast */ 747 counter_u64_add(dst->stats.xmitMulticasts, 1); 748 break; 749 case 2: /* broadcast */ 750 counter_u64_add(dst->stats.xmitBroadcasts, 1); 751 break; 752 } 753 return (0); 754 } 755 756 /* 757 * Loop body for sending to multiple destinations 758 * return 0 to stop looping 759 */ 760 static int 761 ng_bridge_send_ctx(hook_p dst, void *arg) 762 { 763 struct ng_bridge_send_ctx *ctx = arg; 764 link_p destLink = NG_HOOK_PRIVATE(dst); 765 struct mbuf *m2 = NULL; 766 int error = 0; 767 768 /* Skip incoming link */ 769 if (destLink == ctx->incoming) { 770 return (1); 771 } 772 773 /* Skip sending unknowns to undesired links */ 774 if (!ctx->manycast && !destLink->sendUnknown) 775 return (1); 776 777 if (ctx->foundFirst == NULL) { 778 /* 779 * This is the first usable link we have found. 780 * Reserve it for the originals. 781 * If we never find another we save a copy. 782 */ 783 ctx->foundFirst = destLink; 784 return (1); 785 } 786 787 /* 788 * It's usable link but not the reserved (first) one. 789 * Copy mbuf info for sending. 790 */ 791 m2 = m_dup(ctx->m, M_NOWAIT); 792 if (m2 == NULL) { 793 counter_u64_add(ctx->incoming->stats.memoryFailures, 1); 794 ctx->error = ENOBUFS; 795 return (0); /* abort loop, do not try again and again */ 796 } 797 798 /* Send packet */ 799 error = ng_bridge_send_data(destLink, ctx->manycast, m2, NULL); 800 if (error) 801 ctx->error = error; 802 return (1); 803 } 804 805 static int 806 ng_bridge_rcvdata(hook_p hook, item_p item) 807 { 808 const node_p node = NG_HOOK_NODE(hook); 809 const priv_p priv = NG_NODE_PRIVATE(node); 810 struct ng_bridge_host *host; 811 struct ether_header *eh; 812 struct ng_bridge_send_ctx ctx = { 0 }; 813 hook_p ret; 814 815 NGI_GET_M(item, ctx.m); 816 817 ctx.incoming = NG_HOOK_PRIVATE(hook); 818 /* Sanity check packet and pull up header */ 819 if (ctx.m->m_pkthdr.len < ETHER_HDR_LEN) { 820 counter_u64_add(ctx.incoming->stats.recvRunts, 1); 821 NG_FREE_ITEM(item); 822 NG_FREE_M(ctx.m); 823 return (EINVAL); 824 } 825 if (ctx.m->m_len < ETHER_HDR_LEN && !(ctx.m = m_pullup(ctx.m, ETHER_HDR_LEN))) { 826 counter_u64_add(ctx.incoming->stats.memoryFailures, 1); 827 NG_FREE_ITEM(item); 828 return (ENOBUFS); 829 } 830 eh = mtod(ctx.m, struct ether_header *); 831 if ((eh->ether_shost[0] & 1) != 0) { 832 counter_u64_add(ctx.incoming->stats.recvInvalid, 1); 833 NG_FREE_ITEM(item); 834 NG_FREE_M(ctx.m); 835 return (EINVAL); 836 } 837 838 /* Is link disabled due to a loopback condition? */ 839 if (ctx.incoming->loopCount != 0) { 840 counter_u64_add(ctx.incoming->stats.loopDrops, 1); 841 NG_FREE_ITEM(item); 842 NG_FREE_M(ctx.m); 843 return (ELOOP); 844 } 845 846 /* Update stats */ 847 counter_u64_add(ctx.incoming->stats.recvPackets, 1); 848 counter_u64_add(ctx.incoming->stats.recvOctets, ctx.m->m_pkthdr.len); 849 if ((ctx.manycast = (eh->ether_dhost[0] & 1)) != 0) { 850 if (ETHER_EQUAL(eh->ether_dhost, ng_bridge_bcast_addr)) { 851 counter_u64_add(ctx.incoming->stats.recvBroadcasts, 1); 852 ctx.manycast = 2; 853 } else 854 counter_u64_add(ctx.incoming->stats.recvMulticasts, 1); 855 } 856 857 /* Look up packet's source Ethernet address in hashtable */ 858 if ((host = ng_bridge_get(priv, eh->ether_shost)) != NULL) 859 /* Update time since last heard from this host. 860 * This is safe without locking, because it's 861 * the only operation during shared access. 862 */ 863 if (__predict_false(host->staleness > 0)) 864 host->staleness = 0; 865 866 if ((host == NULL && ctx.incoming->learnMac) || 867 (host != NULL && host->link != ctx.incoming)) { 868 struct ng_mesg *msg; 869 struct ng_bridge_move_host *mh; 870 int error = 0; 871 872 NG_MKMESSAGE(msg, NGM_BRIDGE_COOKIE, NGM_BRIDGE_MOVE_HOST, 873 sizeof(*mh), M_NOWAIT); 874 if (msg == NULL) { 875 counter_u64_add(ctx.incoming->stats.memoryFailures, 1); 876 NG_FREE_ITEM(item); 877 NG_FREE_M(ctx.m); 878 return (ENOMEM); 879 } 880 mh = (struct ng_bridge_move_host *)msg->data; 881 strncpy(mh->hook, NG_HOOK_NAME(ctx.incoming->hook), 882 sizeof(mh->hook)); 883 memcpy(mh->addr, eh->ether_shost, sizeof(mh->addr)); 884 NG_SEND_MSG_ID(error, node, msg, NG_NODE_ID(node), 885 NG_NODE_ID(node)); 886 if (error) 887 counter_u64_add(ctx.incoming->stats.memoryFailures, 1); 888 } 889 890 if (host != NULL && host->link != ctx.incoming) { 891 if (host->age < priv->conf.minStableAge) { 892 /* Drop packet on instable links */ 893 counter_u64_add(ctx.incoming->stats.loopDrops, 1); 894 NG_FREE_ITEM(item); 895 NG_FREE_M(ctx.m); 896 return (ELOOP); 897 } 898 } 899 900 /* Run packet through ipfw processing, if enabled */ 901 #if 0 902 if (priv->conf.ipfw[linkNum] && V_fw_enable && V_ip_fw_chk_ptr != NULL) { 903 /* XXX not implemented yet */ 904 } 905 #endif 906 907 /* 908 * If unicast and destination host known, deliver to host's link, 909 * unless it is the same link as the packet came in on. 910 */ 911 if (!ctx.manycast) { 912 913 /* Determine packet destination link */ 914 if ((host = ng_bridge_get(priv, eh->ether_dhost)) != NULL) { 915 link_p destLink = host->link; 916 917 /* If destination same as incoming link, do nothing */ 918 if (destLink == ctx.incoming) { 919 NG_FREE_ITEM(item); 920 NG_FREE_M(ctx.m); 921 return (0); 922 } 923 924 /* Deliver packet out the destination link */ 925 return (ng_bridge_send_data(destLink, ctx.manycast, ctx.m, item)); 926 } 927 928 /* Destination host is not known */ 929 counter_u64_add(ctx.incoming->stats.recvUnknown, 1); 930 } 931 932 /* Distribute unknown, multicast, broadcast pkts to all other links */ 933 NG_NODE_FOREACH_HOOK(node, ng_bridge_send_ctx, &ctx, ret); 934 935 /* Finally send out on the first link found */ 936 if (ctx.foundFirst != NULL) { 937 int error = ng_bridge_send_data(ctx.foundFirst, ctx.manycast, ctx.m, item); 938 if (error) 939 ctx.error = error; 940 } else { /* nothing to send at all */ 941 NG_FREE_ITEM(item); 942 NG_FREE_M(ctx.m); 943 } 944 945 return (ctx.error); 946 } 947 948 /* 949 * Shutdown node 950 */ 951 static int 952 ng_bridge_shutdown(node_p node) 953 { 954 const priv_p priv = NG_NODE_PRIVATE(node); 955 956 /* 957 * Shut down everything including the timer. Even if the 958 * callout has already been dequeued and is about to be 959 * run, ng_bridge_timeout() won't be fired as the node 960 * is already marked NGF_INVALID, so we're safe to free 961 * the node now. 962 */ 963 KASSERT(priv->numLinks == 0 && priv->numHosts == 0, 964 ("%s: numLinks=%d numHosts=%d", 965 __func__, priv->numLinks, priv->numHosts)); 966 ng_uncallout(&priv->timer, node); 967 NG_NODE_SET_PRIVATE(node, NULL); 968 NG_NODE_UNREF(node); 969 free(priv->tab, M_NETGRAPH_BRIDGE); 970 free(priv, M_NETGRAPH_BRIDGE); 971 return (0); 972 } 973 974 /* 975 * Hook disconnection. 976 */ 977 static int 978 ng_bridge_disconnect(hook_p hook) 979 { 980 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 981 link_p link = NG_HOOK_PRIVATE(hook); 982 983 /* Remove all hosts associated with this link */ 984 ng_bridge_remove_hosts(priv, link); 985 986 /* Free associated link information */ 987 counter_u64_free(link->stats.recvOctets); 988 counter_u64_free(link->stats.recvPackets); 989 counter_u64_free(link->stats.recvMulticasts); 990 counter_u64_free(link->stats.recvBroadcasts); 991 counter_u64_free(link->stats.recvUnknown); 992 counter_u64_free(link->stats.recvRunts); 993 counter_u64_free(link->stats.recvInvalid); 994 counter_u64_free(link->stats.xmitOctets); 995 counter_u64_free(link->stats.xmitPackets); 996 counter_u64_free(link->stats.xmitMulticasts); 997 counter_u64_free(link->stats.xmitBroadcasts); 998 counter_u64_free(link->stats.loopDrops); 999 counter_u64_free(link->stats.memoryFailures); 1000 free(link, M_NETGRAPH_BRIDGE); 1001 priv->numLinks--; 1002 1003 /* If no more hooks, go away */ 1004 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 1005 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))) 1006 && !priv->persistent) { 1007 ng_rmnode_self(NG_HOOK_NODE(hook)); 1008 } 1009 return (0); 1010 } 1011 1012 /****************************************************************** 1013 HASH TABLE FUNCTIONS 1014 ******************************************************************/ 1015 1016 /* 1017 * Hash algorithm 1018 */ 1019 #define HASH(addr,mask) ( (((const u_int16_t *)(addr))[0] \ 1020 ^ ((const u_int16_t *)(addr))[1] \ 1021 ^ ((const u_int16_t *)(addr))[2]) & (mask) ) 1022 1023 /* 1024 * Find a host entry in the table. 1025 */ 1026 static struct ng_bridge_host * 1027 ng_bridge_get(priv_cp priv, const u_char *addr) 1028 { 1029 const int bucket = HASH(addr, priv->hashMask); 1030 struct ng_bridge_host *host; 1031 1032 SLIST_FOREACH(host, &priv->tab[bucket], next) { 1033 if (ETHER_EQUAL(host->addr, addr)) 1034 return (host); 1035 } 1036 return (NULL); 1037 } 1038 1039 /* 1040 * Add a host entry to the table. If it already exists, move it 1041 * to the new link. Returns 0 on success. 1042 */ 1043 static int 1044 ng_bridge_put(priv_p priv, const u_char *addr, link_p link) 1045 { 1046 const int bucket = HASH(addr, priv->hashMask); 1047 struct ng_bridge_host *host; 1048 1049 if ((host = ng_bridge_get(priv, addr)) != NULL) { 1050 /* Host already on the correct link? */ 1051 if (host->link == link) 1052 return 0; 1053 1054 /* Move old host over to new link */ 1055 if (host->age >= priv->conf.minStableAge) { 1056 host->link = link; 1057 host->age = 0; 1058 return (0); 1059 } 1060 /* 1061 * If the host was recently moved to the old link and 1062 * it's now jumping to a new link, declare a loopback 1063 * condition. 1064 */ 1065 if (priv->conf.debugLevel >= 2) 1066 log(LOG_WARNING, "ng_bridge: %s:" 1067 " loopback detected on %s\n", 1068 ng_bridge_nodename(priv->node), 1069 NG_HOOK_NAME(link->hook)); 1070 1071 /* Mark link as linka non grata */ 1072 link->loopCount = priv->conf.loopTimeout; 1073 link->stats.loopDetects++; 1074 1075 /* Forget all hosts on this link */ 1076 ng_bridge_remove_hosts(priv, link); 1077 return (ELOOP); 1078 } 1079 1080 /* Allocate and initialize new hashtable entry */ 1081 host = malloc(sizeof(*host), M_NETGRAPH_BRIDGE, M_NOWAIT); 1082 if (host == NULL) 1083 return (ENOMEM); 1084 bcopy(addr, host->addr, ETHER_ADDR_LEN); 1085 host->link = link; 1086 host->staleness = 0; 1087 host->age = 0; 1088 1089 /* Add new element to hash bucket */ 1090 SLIST_INSERT_HEAD(&priv->tab[bucket], host, next); 1091 priv->numHosts++; 1092 1093 /* Resize table if necessary */ 1094 ng_bridge_rehash(priv); 1095 return (0); 1096 } 1097 1098 /* 1099 * Resize the hash table. We try to maintain the number of buckets 1100 * such that the load factor is in the range 0.25 to 1.0. 1101 * 1102 * If we can't get the new memory then we silently fail. This is OK 1103 * because things will still work and we'll try again soon anyway. 1104 */ 1105 static void 1106 ng_bridge_rehash(priv_p priv) 1107 { 1108 struct ng_bridge_bucket *newTab; 1109 int oldBucket, newBucket; 1110 int newNumBuckets; 1111 u_int newMask; 1112 1113 /* Is table too full or too empty? */ 1114 if (priv->numHosts > priv->numBuckets 1115 && (priv->numBuckets << 1) <= MAX_BUCKETS) 1116 newNumBuckets = priv->numBuckets << 1; 1117 else if (priv->numHosts < (priv->numBuckets >> 2) 1118 && (priv->numBuckets >> 2) >= MIN_BUCKETS) 1119 newNumBuckets = priv->numBuckets >> 2; 1120 else 1121 return; 1122 newMask = newNumBuckets - 1; 1123 1124 /* Allocate and initialize new table */ 1125 newTab = malloc(newNumBuckets * sizeof(*newTab), 1126 M_NETGRAPH_BRIDGE, M_NOWAIT | M_ZERO); 1127 if (newTab == NULL) 1128 return; 1129 1130 /* Move all entries from old table to new table */ 1131 for (oldBucket = 0; oldBucket < priv->numBuckets; oldBucket++) { 1132 struct ng_bridge_bucket *const oldList = &priv->tab[oldBucket]; 1133 1134 while (!SLIST_EMPTY(oldList)) { 1135 struct ng_bridge_host *const host 1136 = SLIST_FIRST(oldList); 1137 1138 SLIST_REMOVE_HEAD(oldList, next); 1139 newBucket = HASH(host->addr, newMask); 1140 SLIST_INSERT_HEAD(&newTab[newBucket], host, next); 1141 } 1142 } 1143 1144 /* Replace old table with new one */ 1145 if (priv->conf.debugLevel >= 3) { 1146 log(LOG_INFO, "ng_bridge: %s: table size %d -> %d\n", 1147 ng_bridge_nodename(priv->node), 1148 priv->numBuckets, newNumBuckets); 1149 } 1150 free(priv->tab, M_NETGRAPH_BRIDGE); 1151 priv->numBuckets = newNumBuckets; 1152 priv->hashMask = newMask; 1153 priv->tab = newTab; 1154 return; 1155 } 1156 1157 /****************************************************************** 1158 MISC FUNCTIONS 1159 ******************************************************************/ 1160 1161 1162 /* 1163 * Remove all hosts associated with a specific link from the hashtable. 1164 * If linkNum == -1, then remove all hosts in the table. 1165 */ 1166 static void 1167 ng_bridge_remove_hosts(priv_p priv, link_p link) 1168 { 1169 int bucket; 1170 1171 for (bucket = 0; bucket < priv->numBuckets; bucket++) { 1172 struct ng_bridge_host **hptr = &SLIST_FIRST(&priv->tab[bucket]); 1173 1174 while (*hptr != NULL) { 1175 struct ng_bridge_host *const host = *hptr; 1176 1177 if (link == NULL || host->link == link) { 1178 *hptr = SLIST_NEXT(host, next); 1179 free(host, M_NETGRAPH_BRIDGE); 1180 priv->numHosts--; 1181 } else 1182 hptr = &SLIST_NEXT(host, next); 1183 } 1184 } 1185 } 1186 1187 /* 1188 * Handle our once-per-second timeout event. We do two things: 1189 * we decrement link->loopCount for those links being muted due to 1190 * a detected loopback condition, and we remove any hosts from 1191 * the hashtable whom we haven't heard from in a long while. 1192 */ 1193 static int 1194 ng_bridge_unmute(hook_p hook, void *arg) 1195 { 1196 link_p link = NG_HOOK_PRIVATE(hook); 1197 node_p node = NG_HOOK_NODE(hook); 1198 priv_p priv = NG_NODE_PRIVATE(node); 1199 int *counter = arg; 1200 1201 if (link->loopCount != 0) { 1202 link->loopCount--; 1203 if (link->loopCount == 0 && priv->conf.debugLevel >= 2) { 1204 log(LOG_INFO, "ng_bridge: %s:" 1205 " restoring looped back %s\n", 1206 ng_bridge_nodename(node), NG_HOOK_NAME(hook)); 1207 } 1208 } 1209 (*counter)++; 1210 return (1); 1211 } 1212 1213 static void 1214 ng_bridge_timeout(node_p node, hook_p hook, void *arg1, int arg2) 1215 { 1216 const priv_p priv = NG_NODE_PRIVATE(node); 1217 int bucket; 1218 int counter = 0; 1219 hook_p ret; 1220 1221 /* Update host time counters and remove stale entries */ 1222 for (bucket = 0; bucket < priv->numBuckets; bucket++) { 1223 struct ng_bridge_host **hptr = &SLIST_FIRST(&priv->tab[bucket]); 1224 1225 while (*hptr != NULL) { 1226 struct ng_bridge_host *const host = *hptr; 1227 1228 /* Remove hosts we haven't heard from in a while */ 1229 if (++host->staleness >= priv->conf.maxStaleness) { 1230 *hptr = SLIST_NEXT(host, next); 1231 free(host, M_NETGRAPH_BRIDGE); 1232 priv->numHosts--; 1233 } else { 1234 if (host->age < 0xffff) 1235 host->age++; 1236 hptr = &SLIST_NEXT(host, next); 1237 counter++; 1238 } 1239 } 1240 } 1241 KASSERT(priv->numHosts == counter, 1242 ("%s: hosts: %d != %d", __func__, priv->numHosts, counter)); 1243 1244 /* Decrease table size if necessary */ 1245 ng_bridge_rehash(priv); 1246 1247 /* Decrease loop counter on muted looped back links */ 1248 counter = 0; 1249 NG_NODE_FOREACH_HOOK(node, ng_bridge_unmute, &counter, ret); 1250 KASSERT(priv->numLinks == counter, 1251 ("%s: links: %d != %d", __func__, priv->numLinks, counter)); 1252 1253 /* Register a new timeout, keeping the existing node reference */ 1254 ng_callout(&priv->timer, node, NULL, hz, ng_bridge_timeout, NULL, 0); 1255 } 1256 1257 /* 1258 * Return node's "name", even if it doesn't have one. 1259 */ 1260 static const char * 1261 ng_bridge_nodename(node_cp node) 1262 { 1263 static char name[NG_NODESIZ]; 1264 1265 if (NG_NODE_HAS_NAME(node)) 1266 snprintf(name, sizeof(name), "%s", NG_NODE_NAME(node)); 1267 else 1268 snprintf(name, sizeof(name), "[%x]", ng_node2ID(node)); 1269 return name; 1270 } 1271
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