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 37/* 38 * ng_bridge(4) netgraph node type 39 * 40 * The node performs standard intelligent Ethernet bridging over 41 * each of its connected hooks, or links. A simple loop detection 42 * algorithm is included which disables a link for priv->conf.loopTimeout 43 * seconds when a host is seen to have jumped from one link to 44 * another within priv->conf.minStableAge seconds. 45 * 46 * We keep a hashtable that maps Ethernet addresses to host info, 47 * which is contained in struct ng_bridge_host's. These structures 48 * tell us on which link the host may be found. A host's entry will 49 * expire after priv->conf.maxStaleness seconds. 50 * 51 * This node is optimzed for stable networks, where machines jump 52 * from one port to the other only rarely. 53 */ 54 55#include <sys/param.h> 56#include <sys/systm.h> 57#include <sys/kernel.h> 58#include <sys/lock.h> 59#include <sys/malloc.h> 60#include <sys/mbuf.h> 61#include <sys/errno.h> 62#include <sys/rwlock.h> 63#include <sys/syslog.h> 64#include <sys/socket.h> 65#include <sys/ctype.h> 66#include <sys/types.h> 67#include <sys/counter.h> 68 69#include <net/if.h> 70#include <net/if_var.h> 71#include <net/ethernet.h> 72#include <net/vnet.h> 73 74#include <netinet/in.h> 75#include <netgraph/ng_message.h> 76#include <netgraph/netgraph.h> 77#include <netgraph/ng_parse.h> 78#include <netgraph/ng_bridge.h> 79 80#ifdef NG_SEPARATE_MALLOC 81static MALLOC_DEFINE(M_NETGRAPH_BRIDGE, "netgraph_bridge", 82 "netgraph bridge node"); 83#else 84#define M_NETGRAPH_BRIDGE M_NETGRAPH 85#endif 86 87/* Counter based stats */ 88struct ng_bridge_link_kernel_stats { 89 counter_u64_t recvOctets; /* total octets rec'd on link */ 90 counter_u64_t recvPackets; /* total pkts rec'd on link */ 91 counter_u64_t recvMulticasts; /* multicast pkts rec'd on link */ 92 counter_u64_t recvBroadcasts; /* broadcast pkts rec'd on link */ 93 counter_u64_t recvUnknown; /* pkts rec'd with unknown dest addr */ 94 counter_u64_t recvRunts; /* pkts rec'd less than 14 bytes */ 95 counter_u64_t recvInvalid; /* pkts rec'd with bogus source addr */ 96 counter_u64_t xmitOctets; /* total octets xmit'd on link */ 97 counter_u64_t xmitPackets; /* total pkts xmit'd on link */ 98 counter_u64_t xmitMulticasts; /* multicast pkts xmit'd on link */ 99 counter_u64_t xmitBroadcasts; /* broadcast pkts xmit'd on link */ 100 counter_u64_t loopDrops; /* pkts dropped due to loopback */ 101 u_int64_t loopDetects; /* number of loop detections */ 102 counter_u64_t memoryFailures; /* times couldn't get mem or mbuf */ 103}; 104 105/* Per-link private data */ 106struct ng_bridge_link { 107 hook_p hook; /* netgraph hook */ 108 u_int16_t loopCount; /* loop ignore timer */ 109 unsigned int learnMac : 1, /* autolearn macs */ 110 sendUnknown : 1;/* send unknown macs out */ 111 struct ng_bridge_link_kernel_stats stats; /* link stats */ 112}; 113typedef struct ng_bridge_link const *link_cp; /* read only access */ 114 115/* Per-node private data */ 116struct ng_bridge_private { 117 struct ng_bridge_bucket *tab; /* hash table bucket array */ 118 struct ng_bridge_config conf; /* node configuration */ 119 node_p node; /* netgraph node */ 120 u_int numHosts; /* num entries in table */ 121 u_int numBuckets; /* num buckets in table */ 122 u_int hashMask; /* numBuckets - 1 */ 123 int numLinks; /* num connected links */ 124 unsigned int persistent : 1, /* can exist w/o hooks */ 125 sendUnknown : 1;/* links receive unknowns by default */ 126 struct callout timer; /* one second periodic timer */ 127 struct unrhdr *linkUnit; /* link unit number allocator */ 128 struct unrhdr *uplinkUnit; /* uplink unit number allocator */ 129}; 130typedef struct ng_bridge_private *priv_p; 131typedef struct ng_bridge_private const *priv_cp; /* read only access */ 132 133/* Information about a host, stored in a hash table entry */ 134struct ng_bridge_host { 135 u_char addr[6]; /* ethernet address */ 136 link_p link; /* link where addr can be found */ 137 u_int16_t age; /* seconds ago entry was created */ 138 u_int16_t staleness; /* seconds ago host last heard from */ 139 SLIST_ENTRY(ng_bridge_host) next; /* next entry in bucket */ 140}; 141 142/* Hash table bucket declaration */ 143SLIST_HEAD(ng_bridge_bucket, ng_bridge_host); 144 145/* [up]link prefix matching */ 146struct ng_link_prefix { 147 const char * const prefix; 148 size_t len; 149}; 150 151static const struct ng_link_prefix link_pfx = { 152 .prefix = NG_BRIDGE_HOOK_LINK_PREFIX, 153 .len = sizeof(NG_BRIDGE_HOOK_LINK_PREFIX) - 1, 154}; 155static const struct ng_link_prefix uplink_pfx = { 156 .prefix = NG_BRIDGE_HOOK_UPLINK_PREFIX, 157 .len = sizeof(NG_BRIDGE_HOOK_UPLINK_PREFIX) - 1, 158}; 159 160/* Netgraph node methods */ 161static ng_constructor_t ng_bridge_constructor; 162static ng_rcvmsg_t ng_bridge_rcvmsg; 163static ng_shutdown_t ng_bridge_shutdown; 164static ng_newhook_t ng_bridge_newhook; 165static ng_rcvdata_t ng_bridge_rcvdata; 166static ng_disconnect_t ng_bridge_disconnect; 167 168/* Other internal functions */ 169static const struct ng_link_prefix *ng_get_link_prefix(const char *name); 170static void ng_bridge_free_link(link_p link); 171static struct ng_bridge_host *ng_bridge_get(priv_cp priv, const u_char *addr); 172static int ng_bridge_put(priv_p priv, const u_char *addr, link_p link); 173static void ng_bridge_rehash(priv_p priv); 174static void ng_bridge_remove_hosts(priv_p priv, link_p link); 175static void ng_bridge_timeout(node_p node, hook_p hook, void *arg1, int arg2); 176static const char *ng_bridge_nodename(node_cp node); 177 178/* Ethernet broadcast */ 179static const u_char ng_bridge_bcast_addr[ETHER_ADDR_LEN] = 180 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 181 182/* Compare Ethernet addresses using 32 and 16 bit words instead of bytewise */ 183#define ETHER_EQUAL(a,b) (((const u_int32_t *)(a))[0] \ 184 == ((const u_int32_t *)(b))[0] \ 185 && ((const u_int16_t *)(a))[2] \ 186 == ((const u_int16_t *)(b))[2]) 187 188/* Minimum and maximum number of hash buckets. Must be a power of two. */ 189#define MIN_BUCKETS (1 << 5) /* 32 */ 190#define MAX_BUCKETS (1 << 14) /* 16384 */ 191 192/* Configuration default values */ 193#define DEFAULT_LOOP_TIMEOUT 60 194#define DEFAULT_MAX_STALENESS (15 * 60) /* same as ARP timeout */ 195#define DEFAULT_MIN_STABLE_AGE 1 196 197/****************************************************************** 198 NETGRAPH PARSE TYPES 199******************************************************************/ 200 201/* 202 * How to determine the length of the table returned by NGM_BRIDGE_GET_TABLE 203 */ 204static int 205ng_bridge_getTableLength(const struct ng_parse_type *type, 206 const u_char *start, const u_char *buf) 207{ 208 const struct ng_bridge_host_ary *const hary 209 = (const struct ng_bridge_host_ary *)(buf - sizeof(u_int32_t)); 210 211 return hary->numHosts; 212} 213 214/* Parse type for struct ng_bridge_host_ary */ 215static const struct ng_parse_struct_field ng_bridge_host_type_fields[] 216 = NG_BRIDGE_HOST_TYPE_INFO(&ng_parse_enaddr_type); 217static const struct ng_parse_type ng_bridge_host_type = { 218 &ng_parse_struct_type, 219 &ng_bridge_host_type_fields 220}; 221static const struct ng_parse_array_info ng_bridge_hary_type_info = { 222 &ng_bridge_host_type, 223 ng_bridge_getTableLength 224}; 225static const struct ng_parse_type ng_bridge_hary_type = { 226 &ng_parse_array_type, 227 &ng_bridge_hary_type_info 228}; 229static const struct ng_parse_struct_field ng_bridge_host_ary_type_fields[] 230 = NG_BRIDGE_HOST_ARY_TYPE_INFO(&ng_bridge_hary_type); 231static const struct ng_parse_type ng_bridge_host_ary_type = { 232 &ng_parse_struct_type, 233 &ng_bridge_host_ary_type_fields 234}; 235 236/* Parse type for struct ng_bridge_config */ 237static const struct ng_parse_struct_field ng_bridge_config_type_fields[] 238 = NG_BRIDGE_CONFIG_TYPE_INFO; 239static const struct ng_parse_type ng_bridge_config_type = { 240 &ng_parse_struct_type, 241 &ng_bridge_config_type_fields 242}; 243 244/* Parse type for struct ng_bridge_link_stat */ 245static const struct ng_parse_struct_field ng_bridge_stats_type_fields[] 246 = NG_BRIDGE_STATS_TYPE_INFO; 247static const struct ng_parse_type ng_bridge_stats_type = { 248 &ng_parse_struct_type, 249 &ng_bridge_stats_type_fields 250}; 251/* Parse type for struct ng_bridge_move_host */ 252static const struct ng_parse_struct_field ng_bridge_move_host_type_fields[] 253 = NG_BRIDGE_MOVE_HOST_TYPE_INFO(&ng_parse_enaddr_type); 254static const struct ng_parse_type ng_bridge_move_host_type = { 255 &ng_parse_struct_type, 256 &ng_bridge_move_host_type_fields 257}; 258 259/* List of commands and how to convert arguments to/from ASCII */ 260static const struct ng_cmdlist ng_bridge_cmdlist[] = { 261 { 262 NGM_BRIDGE_COOKIE, 263 NGM_BRIDGE_SET_CONFIG, 264 "setconfig", 265 &ng_bridge_config_type, 266 NULL 267 }, 268 { 269 NGM_BRIDGE_COOKIE, 270 NGM_BRIDGE_GET_CONFIG, 271 "getconfig", 272 NULL, 273 &ng_bridge_config_type 274 }, 275 { 276 NGM_BRIDGE_COOKIE, 277 NGM_BRIDGE_RESET, 278 "reset", 279 NULL, 280 NULL 281 }, 282 { 283 NGM_BRIDGE_COOKIE, 284 NGM_BRIDGE_GET_STATS, 285 "getstats", 286 &ng_parse_uint32_type, 287 &ng_bridge_stats_type 288 }, 289 { 290 NGM_BRIDGE_COOKIE, 291 NGM_BRIDGE_CLR_STATS, 292 "clrstats", 293 &ng_parse_uint32_type, 294 NULL 295 }, 296 { 297 NGM_BRIDGE_COOKIE, 298 NGM_BRIDGE_GETCLR_STATS, 299 "getclrstats", 300 &ng_parse_uint32_type, 301 &ng_bridge_stats_type 302 }, 303 { 304 NGM_BRIDGE_COOKIE, 305 NGM_BRIDGE_GET_TABLE, 306 "gettable", 307 NULL, 308 &ng_bridge_host_ary_type 309 }, 310 { 311 NGM_BRIDGE_COOKIE, 312 NGM_BRIDGE_SET_PERSISTENT, 313 "setpersistent", 314 NULL, 315 NULL 316 }, 317 { 318 NGM_BRIDGE_COOKIE, 319 NGM_BRIDGE_MOVE_HOST, 320 "movehost", 321 &ng_bridge_move_host_type, 322 NULL 323 }, 324 { 0 } 325}; 326 327/* Node type descriptor */ 328static struct ng_type ng_bridge_typestruct = { 329 .version = NG_ABI_VERSION, 330 .name = NG_BRIDGE_NODE_TYPE, 331 .constructor = ng_bridge_constructor, 332 .rcvmsg = ng_bridge_rcvmsg, 333 .shutdown = ng_bridge_shutdown, 334 .newhook = ng_bridge_newhook, 335 .rcvdata = ng_bridge_rcvdata, 336 .disconnect = ng_bridge_disconnect, 337 .cmdlist = ng_bridge_cmdlist, 338}; 339NETGRAPH_INIT(bridge, &ng_bridge_typestruct); 340 341/****************************************************************** 342 NETGRAPH NODE METHODS 343******************************************************************/ 344 345/* 346 * Node constructor 347 */ 348static int 349ng_bridge_constructor(node_p node) 350{ 351 priv_p priv; 352 353 /* Allocate and initialize private info */ 354 priv = malloc(sizeof(*priv), M_NETGRAPH_BRIDGE, M_WAITOK | M_ZERO); 355 ng_callout_init(&priv->timer); 356 357 /* Allocate and initialize hash table, etc. */ 358 priv->tab = malloc(MIN_BUCKETS * sizeof(*priv->tab), 359 M_NETGRAPH_BRIDGE, M_WAITOK | M_ZERO); 360 priv->numBuckets = MIN_BUCKETS; 361 priv->hashMask = MIN_BUCKETS - 1; 362 priv->conf.debugLevel = 1; 363 priv->conf.loopTimeout = DEFAULT_LOOP_TIMEOUT; 364 priv->conf.maxStaleness = DEFAULT_MAX_STALENESS; 365 priv->conf.minStableAge = DEFAULT_MIN_STABLE_AGE; 366 priv->sendUnknown = 1; /* classic bridge */ 367 368 NG_NODE_SET_PRIVATE(node, priv); 369 priv->node = node; 370 371 /* Allocators for links. Historically "uplink0" is not allowed. */ 372 priv->linkUnit = new_unrhdr(0, INT_MAX, NULL); 373 priv->uplinkUnit = new_unrhdr(1, INT_MAX, NULL); 374 375 /* Start timer; timer is always running while node is alive */ 376 ng_callout(&priv->timer, node, NULL, hz, ng_bridge_timeout, NULL, 0); 377 378 /* Done */ 379 return (0); 380} 381 382/* 383 * Method for attaching a new hook 384 */ 385static int 386ng_bridge_newhook(node_p node, hook_p hook, const char *name) 387{ 388 const priv_p priv = NG_NODE_PRIVATE(node); 389 link_p link; 390 bool isUplink; 391 uint32_t linkNum; 392 struct unrhdr *unit; 393 394 const struct ng_link_prefix *pfx = ng_get_link_prefix(name); 395 if (pfx == NULL) 396 return (EINVAL); /* not a valid prefix */ 397 398 isUplink = (pfx == &uplink_pfx); 399 unit = isUplink ? priv->uplinkUnit : priv->linkUnit; 400 401 if (strlen(name) > pfx->len) { /* given number */ 402 char linkName[NG_HOOKSIZ]; 403 int rvnum __diagused; 404 405 linkNum = strtoul(name + pfx->len, NULL, 10); 406 /* Validate by comparing against the reconstucted name. */ 407 snprintf(linkName, sizeof(linkName), "%s%u", pfx->prefix, 408 linkNum); 409 if (strcmp(linkName, name) != 0) 410 return (EINVAL); 411 if (linkNum == 0 && isUplink) 412 return (EINVAL); 413 rvnum = alloc_unr_specific(unit, linkNum); 414 MPASS(rvnum == linkNum); 415 } else { 416 /* auto-assign and update hook name */ 417 linkNum = alloc_unr(unit); 418 MPASS(linkNum != -1); 419 snprintf(NG_HOOK_NAME(hook), NG_HOOKSIZ, "%s%u", pfx->prefix, 420 linkNum); 421 } 422 423 if (NG_PEER_NODE(hook) == node) { 424 free_unr(unit, linkNum); 425 return (ELOOP); 426 } 427 428 link = malloc(sizeof(*link), M_NETGRAPH_BRIDGE, M_NOWAIT | M_ZERO); 429 if (link == NULL) { 430 free_unr(unit, linkNum); 431 return (ENOMEM); 432 } 433 434#define NG_BRIDGE_COUNTER_ALLOC(f) do { \ 435 link->stats.f = counter_u64_alloc(M_NOWAIT); \ 436 if (link->stats.f == NULL) \ 437 goto nomem; \ 438} while (0) 439 NG_BRIDGE_COUNTER_ALLOC(recvOctets); 440 NG_BRIDGE_COUNTER_ALLOC(recvPackets); 441 NG_BRIDGE_COUNTER_ALLOC(recvMulticasts); 442 NG_BRIDGE_COUNTER_ALLOC(recvBroadcasts); 443 NG_BRIDGE_COUNTER_ALLOC(recvUnknown); 444 NG_BRIDGE_COUNTER_ALLOC(recvRunts); 445 NG_BRIDGE_COUNTER_ALLOC(recvInvalid); 446 NG_BRIDGE_COUNTER_ALLOC(xmitOctets); 447 NG_BRIDGE_COUNTER_ALLOC(xmitPackets); 448 NG_BRIDGE_COUNTER_ALLOC(xmitMulticasts); 449 NG_BRIDGE_COUNTER_ALLOC(xmitBroadcasts); 450 NG_BRIDGE_COUNTER_ALLOC(loopDrops); 451 NG_BRIDGE_COUNTER_ALLOC(memoryFailures); 452#undef NG_BRIDGE_COUNTER_ALLOC 453 454 link->hook = hook; 455 if (isUplink) { 456 link->learnMac = 0; 457 link->sendUnknown = 1; 458 if (priv->numLinks == 0) /* if the first link is an uplink */ 459 priv->sendUnknown = 0; /* switch to restrictive mode */ 460 } else { 461 link->learnMac = 1; 462 link->sendUnknown = priv->sendUnknown; 463 } 464 465 NG_HOOK_SET_PRIVATE(hook, link); 466 priv->numLinks++; 467 return (0); 468 469nomem: 470 free_unr(unit, linkNum); 471 ng_bridge_free_link(link); 472 return (ENOMEM); 473} 474 475/* 476 * Receive a control message 477 */ 478static void 479ng_bridge_clear_link_stats(struct ng_bridge_link_kernel_stats *p) 480{ 481 counter_u64_zero(p->recvOctets); 482 counter_u64_zero(p->recvPackets); 483 counter_u64_zero(p->recvMulticasts); 484 counter_u64_zero(p->recvBroadcasts); 485 counter_u64_zero(p->recvUnknown); 486 counter_u64_zero(p->recvRunts); 487 counter_u64_zero(p->recvInvalid); 488 counter_u64_zero(p->xmitOctets); 489 counter_u64_zero(p->xmitPackets); 490 counter_u64_zero(p->xmitMulticasts); 491 counter_u64_zero(p->xmitBroadcasts); 492 counter_u64_zero(p->loopDrops); 493 p->loopDetects = 0; 494 counter_u64_zero(p->memoryFailures); 495} 496 497static void 498ng_bridge_free_link(link_p link) 499{ 500 counter_u64_free(link->stats.recvOctets); 501 counter_u64_free(link->stats.recvPackets); 502 counter_u64_free(link->stats.recvMulticasts); 503 counter_u64_free(link->stats.recvBroadcasts); 504 counter_u64_free(link->stats.recvUnknown); 505 counter_u64_free(link->stats.recvRunts); 506 counter_u64_free(link->stats.recvInvalid); 507 counter_u64_free(link->stats.xmitOctets); 508 counter_u64_free(link->stats.xmitPackets); 509 counter_u64_free(link->stats.xmitMulticasts); 510 counter_u64_free(link->stats.xmitBroadcasts); 511 counter_u64_free(link->stats.loopDrops); 512 counter_u64_free(link->stats.memoryFailures); 513 free(link, M_NETGRAPH_BRIDGE); 514} 515 516static int 517ng_bridge_reset_link(hook_p hook, void *arg __unused) 518{ 519 link_p priv = NG_HOOK_PRIVATE(hook); 520 521 priv->loopCount = 0; 522 ng_bridge_clear_link_stats(&priv->stats); 523 return (1); 524} 525 526static int 527ng_bridge_rcvmsg(node_p node, item_p item, hook_p lasthook) 528{ 529 const priv_p priv = NG_NODE_PRIVATE(node); 530 struct ng_mesg *resp = NULL; 531 int error = 0; 532 struct ng_mesg *msg; 533 534 NGI_GET_MSG(item, msg); 535 switch (msg->header.typecookie) { 536 case NGM_BRIDGE_COOKIE: 537 switch (msg->header.cmd) { 538 case NGM_BRIDGE_GET_CONFIG: 539 { 540 struct ng_bridge_config *conf; 541 542 NG_MKRESPONSE(resp, msg, 543 sizeof(struct ng_bridge_config), M_NOWAIT); 544 if (resp == NULL) { 545 error = ENOMEM; 546 break; 547 } 548 conf = (struct ng_bridge_config *)resp->data; 549 *conf = priv->conf; /* no sanity checking needed */ 550 break; 551 } 552 case NGM_BRIDGE_SET_CONFIG: 553 { 554 struct ng_bridge_config *conf; 555 556 if (msg->header.arglen 557 != sizeof(struct ng_bridge_config)) { 558 error = EINVAL; 559 break; 560 } 561 conf = (struct ng_bridge_config *)msg->data; 562 priv->conf = *conf; 563 break; 564 } 565 case NGM_BRIDGE_RESET: 566 { 567 /* Flush all entries in the hash table */ 568 ng_bridge_remove_hosts(priv, NULL); 569 570 /* Reset all loop detection counters and stats */ 571 NG_NODE_FOREACH_HOOK(node, ng_bridge_reset_link, NULL); 572 break; 573 } 574 case NGM_BRIDGE_GET_STATS: 575 case NGM_BRIDGE_CLR_STATS: 576 case NGM_BRIDGE_GETCLR_STATS: 577 { 578 hook_p hook; 579 link_p link; 580 char linkName[NG_HOOKSIZ]; 581 int linkNum; 582 583 /* Get link number */ 584 if (msg->header.arglen != sizeof(u_int32_t)) { 585 error = EINVAL; 586 break; 587 } 588 linkNum = *((int32_t *)msg->data); 589 if (linkNum < 0) 590 snprintf(linkName, sizeof(linkName), 591 "%s%u", NG_BRIDGE_HOOK_UPLINK_PREFIX, -linkNum); 592 else 593 snprintf(linkName, sizeof(linkName), 594 "%s%u", NG_BRIDGE_HOOK_LINK_PREFIX, linkNum); 595 596 if ((hook = ng_findhook(node, linkName)) == NULL) { 597 error = ENOTCONN; 598 break; 599 } 600 link = NG_HOOK_PRIVATE(hook); 601 602 /* Get/clear stats */ 603 if (msg->header.cmd != NGM_BRIDGE_CLR_STATS) { 604 struct ng_bridge_link_stats *rs; 605 606 NG_MKRESPONSE(resp, msg, 607 sizeof(link->stats), M_NOWAIT); 608 if (resp == NULL) { 609 error = ENOMEM; 610 break; 611 } 612 rs = (struct ng_bridge_link_stats *)resp->data; 613#define FETCH(x) rs->x = counter_u64_fetch(link->stats.x) 614 FETCH(recvOctets); 615 FETCH(recvPackets); 616 FETCH(recvMulticasts); 617 FETCH(recvBroadcasts); 618 FETCH(recvUnknown); 619 FETCH(recvRunts); 620 FETCH(recvInvalid); 621 FETCH(xmitOctets); 622 FETCH(xmitPackets); 623 FETCH(xmitMulticasts); 624 FETCH(xmitBroadcasts); 625 FETCH(loopDrops); 626 rs->loopDetects = link->stats.loopDetects; 627 FETCH(memoryFailures); 628#undef FETCH 629 } 630 if (msg->header.cmd != NGM_BRIDGE_GET_STATS) 631 ng_bridge_clear_link_stats(&link->stats); 632 break; 633 } 634 case NGM_BRIDGE_GET_TABLE: 635 { 636 struct ng_bridge_host_ary *ary; 637 struct ng_bridge_host *host; 638 int i = 0, bucket; 639 640 NG_MKRESPONSE(resp, msg, sizeof(*ary) 641 + (priv->numHosts * sizeof(*ary->hosts)), M_NOWAIT); 642 if (resp == NULL) { 643 error = ENOMEM; 644 break; 645 } 646 ary = (struct ng_bridge_host_ary *)resp->data; 647 ary->numHosts = priv->numHosts; 648 for (bucket = 0; bucket < priv->numBuckets; bucket++) { 649 SLIST_FOREACH(host, &priv->tab[bucket], next) { 650 memcpy(ary->hosts[i].addr, 651 host->addr, 652 sizeof(ary->hosts[i].addr)); 653 ary->hosts[i].age = host->age; 654 ary->hosts[i].staleness = host->staleness; 655 strncpy(ary->hosts[i].hook, 656 NG_HOOK_NAME(host->link->hook), 657 sizeof(ary->hosts[i].hook)); 658 i++; 659 } 660 } 661 break; 662 } 663 case NGM_BRIDGE_SET_PERSISTENT: 664 { 665 priv->persistent = 1; 666 break; 667 } 668 case NGM_BRIDGE_MOVE_HOST: 669 { 670 struct ng_bridge_move_host *mh; 671 hook_p hook; 672 673 if (msg->header.arglen < sizeof(*mh)) { 674 error = EINVAL; 675 break; 676 } 677 mh = (struct ng_bridge_move_host *)msg->data; 678 hook = (mh->hook[0] == 0) 679 ? lasthook 680 : ng_findhook(node, mh->hook); 681 if (hook == NULL) { 682 error = ENOENT; 683 break; 684 } 685 error = ng_bridge_put(priv, mh->addr, NG_HOOK_PRIVATE(hook)); 686 break; 687 } 688 default: 689 error = EINVAL; 690 break; 691 } 692 break; 693 default: 694 error = EINVAL; 695 break; 696 } 697 698 /* Done */ 699 NG_RESPOND_MSG(error, node, item, resp); 700 NG_FREE_MSG(msg); 701 return (error); 702} 703 704/* 705 * Receive data on a hook 706 */ 707struct ng_bridge_send_ctx { 708 link_p foundFirst, incoming; 709 struct mbuf * m; 710 int manycast, error; 711}; 712 713/* 714 * Update stats and send out 715 */ 716static inline int 717ng_bridge_send_data(link_cp dst, int manycast, struct mbuf *m, item_p item) { 718 int error = 0; 719 size_t len = m->m_pkthdr.len; 720 721 if(item != NULL) 722 NG_FWD_NEW_DATA(error, item, dst->hook, m); 723 else 724 NG_SEND_DATA_ONLY(error, dst->hook, m); 725 726 if (error) { 727 if (error == ENOMEM) 728 counter_u64_add(dst->stats.memoryFailures, 1); 729 /* The packet is still ours */ 730 if (item != NULL) 731 NG_FREE_ITEM(item); 732 if (m != NULL) 733 NG_FREE_M(m); 734 return (error); 735 } 736 737 counter_u64_add(dst->stats.xmitPackets, 1); 738 counter_u64_add(dst->stats.xmitOctets, len); 739 switch (manycast) { 740 default: /* unknown unicast */ 741 break; 742 case 1: /* multicast */ 743 counter_u64_add(dst->stats.xmitMulticasts, 1); 744 break; 745 case 2: /* broadcast */ 746 counter_u64_add(dst->stats.xmitBroadcasts, 1); 747 break; 748 } 749 return (0); 750} 751 752/* 753 * Loop body for sending to multiple destinations 754 * return 0 to stop looping 755 */ 756static int 757ng_bridge_send_ctx(hook_p dst, void *arg) 758{ 759 struct ng_bridge_send_ctx *ctx = arg; 760 link_p destLink = NG_HOOK_PRIVATE(dst); 761 struct mbuf *m2 = NULL; 762 int error = 0; 763 764 /* Skip incoming link */ 765 if (destLink == ctx->incoming) { 766 return (1); 767 } 768 769 /* Skip sending unknowns to undesired links */ 770 if (!ctx->manycast && !destLink->sendUnknown) 771 return (1); 772 773 if (ctx->foundFirst == NULL) { 774 /* 775 * This is the first usable link we have found. 776 * Reserve it for the originals. 777 * If we never find another we save a copy. 778 */ 779 ctx->foundFirst = destLink; 780 return (1); 781 } 782 783 /* 784 * It's usable link but not the reserved (first) one. 785 * Copy mbuf info for sending. 786 */ 787 m2 = m_dup(ctx->m, M_NOWAIT); 788 if (m2 == NULL) { 789 counter_u64_add(ctx->incoming->stats.memoryFailures, 1); 790 ctx->error = ENOBUFS; 791 return (0); /* abort loop, do not try again and again */ 792 } 793 794 /* Send packet */ 795 error = ng_bridge_send_data(destLink, ctx->manycast, m2, NULL); 796 if (error) 797 ctx->error = error; 798 return (1); 799} 800 801static int 802ng_bridge_rcvdata(hook_p hook, item_p item) 803{ 804 const node_p node = NG_HOOK_NODE(hook); 805 const priv_p priv = NG_NODE_PRIVATE(node); 806 struct ng_bridge_host *host; 807 struct ether_header *eh; 808 struct ng_bridge_send_ctx ctx = { 0 }; 809 810 NGI_GET_M(item, ctx.m); 811 812 ctx.incoming = NG_HOOK_PRIVATE(hook); 813 /* Sanity check packet and pull up header */ 814 if (ctx.m->m_pkthdr.len < ETHER_HDR_LEN) { 815 counter_u64_add(ctx.incoming->stats.recvRunts, 1); 816 NG_FREE_ITEM(item); 817 NG_FREE_M(ctx.m); 818 return (EINVAL); 819 } 820 if (ctx.m->m_len < ETHER_HDR_LEN && !(ctx.m = m_pullup(ctx.m, ETHER_HDR_LEN))) { 821 counter_u64_add(ctx.incoming->stats.memoryFailures, 1); 822 NG_FREE_ITEM(item); 823 return (ENOBUFS); 824 } 825 eh = mtod(ctx.m, struct ether_header *); 826 if ((eh->ether_shost[0] & 1) != 0) { 827 counter_u64_add(ctx.incoming->stats.recvInvalid, 1); 828 NG_FREE_ITEM(item); 829 NG_FREE_M(ctx.m); 830 return (EINVAL); 831 } 832 833 /* Is link disabled due to a loopback condition? */ 834 if (ctx.incoming->loopCount != 0) { 835 counter_u64_add(ctx.incoming->stats.loopDrops, 1); 836 NG_FREE_ITEM(item); 837 NG_FREE_M(ctx.m); 838 return (ELOOP); 839 } 840 841 /* Update stats */ 842 counter_u64_add(ctx.incoming->stats.recvPackets, 1); 843 counter_u64_add(ctx.incoming->stats.recvOctets, ctx.m->m_pkthdr.len); 844 if ((ctx.manycast = (eh->ether_dhost[0] & 1)) != 0) { 845 if (ETHER_EQUAL(eh->ether_dhost, ng_bridge_bcast_addr)) { 846 counter_u64_add(ctx.incoming->stats.recvBroadcasts, 1); 847 ctx.manycast = 2; 848 } else 849 counter_u64_add(ctx.incoming->stats.recvMulticasts, 1); 850 } 851 852 /* Look up packet's source Ethernet address in hashtable */ 853 if ((host = ng_bridge_get(priv, eh->ether_shost)) != NULL) 854 /* Update time since last heard from this host. 855 * This is safe without locking, because it's 856 * the only operation during shared access. 857 */ 858 if (__predict_false(host->staleness > 0)) 859 host->staleness = 0; 860 861 if ((host == NULL && ctx.incoming->learnMac) || 862 (host != NULL && host->link != ctx.incoming)) { 863 struct ng_mesg *msg; 864 struct ng_bridge_move_host *mh; 865 int error = 0; 866 867 NG_MKMESSAGE(msg, NGM_BRIDGE_COOKIE, NGM_BRIDGE_MOVE_HOST, 868 sizeof(*mh), M_NOWAIT); 869 if (msg == NULL) { 870 counter_u64_add(ctx.incoming->stats.memoryFailures, 1); 871 NG_FREE_ITEM(item); 872 NG_FREE_M(ctx.m); 873 return (ENOMEM); 874 } 875 mh = (struct ng_bridge_move_host *)msg->data; 876 strncpy(mh->hook, NG_HOOK_NAME(ctx.incoming->hook), 877 sizeof(mh->hook)); 878 memcpy(mh->addr, eh->ether_shost, sizeof(mh->addr)); 879 NG_SEND_MSG_ID(error, node, msg, NG_NODE_ID(node), 880 NG_NODE_ID(node)); 881 if (error) 882 counter_u64_add(ctx.incoming->stats.memoryFailures, 1); 883 } 884 885 if (host != NULL && host->link != ctx.incoming) { 886 if (host->age < priv->conf.minStableAge) { 887 /* Drop packet on instable links */ 888 counter_u64_add(ctx.incoming->stats.loopDrops, 1); 889 NG_FREE_ITEM(item); 890 NG_FREE_M(ctx.m); 891 return (ELOOP); 892 } 893 } 894 895 /* 896 * If unicast and destination host known, deliver to host's link, 897 * unless it is the same link as the packet came in on. 898 */ 899 if (!ctx.manycast) { 900 /* Determine packet destination link */ 901 if ((host = ng_bridge_get(priv, eh->ether_dhost)) != NULL) { 902 link_p destLink = host->link; 903 904 /* If destination same as incoming link, do nothing */ 905 if (destLink == ctx.incoming) { 906 NG_FREE_ITEM(item); 907 NG_FREE_M(ctx.m); 908 return (0); 909 } 910 911 /* Deliver packet out the destination link */ 912 return (ng_bridge_send_data(destLink, ctx.manycast, ctx.m, item)); 913 } 914 915 /* Destination host is not known */ 916 counter_u64_add(ctx.incoming->stats.recvUnknown, 1); 917 } 918 919 /* Distribute unknown, multicast, broadcast pkts to all other links */ 920 NG_NODE_FOREACH_HOOK(node, ng_bridge_send_ctx, &ctx); 921 922 /* Finally send out on the first link found */ 923 if (ctx.foundFirst != NULL) { 924 int error = ng_bridge_send_data(ctx.foundFirst, ctx.manycast, ctx.m, item); 925 if (error) 926 ctx.error = error; 927 } else { /* nothing to send at all */ 928 NG_FREE_ITEM(item); 929 NG_FREE_M(ctx.m); 930 } 931 932 return (ctx.error); 933} 934 935/* 936 * Shutdown node 937 */ 938static int 939ng_bridge_shutdown(node_p node) 940{ 941 const priv_p priv = NG_NODE_PRIVATE(node); 942 943 /* 944 * Shut down everything including the timer. Even if the 945 * callout has already been dequeued and is about to be 946 * run, ng_bridge_timeout() won't be fired as the node 947 * is already marked NGF_INVALID, so we're safe to free 948 * the node now. 949 */ 950 KASSERT(priv->numLinks == 0 && priv->numHosts == 0, 951 ("%s: numLinks=%d numHosts=%d", 952 __func__, priv->numLinks, priv->numHosts)); 953 ng_uncallout(&priv->timer, node); 954 delete_unrhdr(priv->linkUnit); 955 delete_unrhdr(priv->uplinkUnit); 956 NG_NODE_SET_PRIVATE(node, NULL); 957 NG_NODE_UNREF(node); 958 free(priv->tab, M_NETGRAPH_BRIDGE); 959 free(priv, M_NETGRAPH_BRIDGE); 960 return (0); 961} 962 963/* 964 * Hook disconnection. 965 */ 966static int 967ng_bridge_disconnect(hook_p hook) 968{ 969 char *name = NG_HOOK_NAME(hook); 970 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 971 link_p link = NG_HOOK_PRIVATE(hook); 972 const struct ng_link_prefix *pfx = ng_get_link_prefix(name); 973 uint32_t linkNum; 974 975 /* Remove all hosts associated with this link */ 976 ng_bridge_remove_hosts(priv, link); 977 978 /* Free associated link information */ 979 ng_bridge_free_link(link); 980 priv->numLinks--; 981 982 linkNum = strtoul(name + pfx->len, NULL, 10); 983 free_unr(pfx == &link_pfx ? priv->linkUnit: priv->uplinkUnit, linkNum); 984 985 /* If no more hooks, go away */ 986 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 987 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))) 988 && !priv->persistent) { 989 ng_rmnode_self(NG_HOOK_NODE(hook)); 990 } 991 return (0); 992} 993 994/****************************************************************** 995 HASH TABLE FUNCTIONS 996******************************************************************/ 997 998/* 999 * Hash algorithm 1000 */ 1001#define HASH(addr,mask) ( (((const u_int16_t *)(addr))[0] \ 1002 ^ ((const u_int16_t *)(addr))[1] \ 1003 ^ ((const u_int16_t *)(addr))[2]) & (mask) ) 1004 1005/* 1006 * Find a host entry in the table. 1007 */ 1008static struct ng_bridge_host * 1009ng_bridge_get(priv_cp priv, const u_char *addr) 1010{ 1011 const int bucket = HASH(addr, priv->hashMask); 1012 struct ng_bridge_host *host; 1013 1014 SLIST_FOREACH(host, &priv->tab[bucket], next) { 1015 if (ETHER_EQUAL(host->addr, addr)) 1016 return (host); 1017 } 1018 return (NULL); 1019} 1020 1021/* 1022 * Add a host entry to the table. If it already exists, move it 1023 * to the new link. Returns 0 on success. 1024 */ 1025static int 1026ng_bridge_put(priv_p priv, const u_char *addr, link_p link) 1027{ 1028 const int bucket = HASH(addr, priv->hashMask); 1029 struct ng_bridge_host *host; 1030 1031 if ((host = ng_bridge_get(priv, addr)) != NULL) { 1032 /* Host already on the correct link? */ 1033 if (host->link == link) 1034 return 0; 1035 1036 /* Move old host over to new link */ 1037 if (host->age >= priv->conf.minStableAge) { 1038 host->link = link; 1039 host->age = 0; 1040 return (0); 1041 } 1042 /* 1043 * If the host was recently moved to the old link and 1044 * it's now jumping to a new link, declare a loopback 1045 * condition. 1046 */ 1047 if (priv->conf.debugLevel >= 2) 1048 log(LOG_WARNING, "ng_bridge: %s:" 1049 " loopback detected on %s\n", 1050 ng_bridge_nodename(priv->node), 1051 NG_HOOK_NAME(link->hook)); 1052 1053 /* Mark link as linka non grata */ 1054 link->loopCount = priv->conf.loopTimeout; 1055 link->stats.loopDetects++; 1056 1057 /* Forget all hosts on this link */ 1058 ng_bridge_remove_hosts(priv, link); 1059 return (ELOOP); 1060 } 1061 1062 /* Allocate and initialize new hashtable entry */ 1063 host = malloc(sizeof(*host), M_NETGRAPH_BRIDGE, M_NOWAIT); 1064 if (host == NULL) 1065 return (ENOMEM); 1066 bcopy(addr, host->addr, ETHER_ADDR_LEN); 1067 host->link = link; 1068 host->staleness = 0; 1069 host->age = 0; 1070 1071 /* Add new element to hash bucket */ 1072 SLIST_INSERT_HEAD(&priv->tab[bucket], host, next); 1073 priv->numHosts++; 1074 1075 /* Resize table if necessary */ 1076 ng_bridge_rehash(priv); 1077 return (0); 1078} 1079 1080/* 1081 * Resize the hash table. We try to maintain the number of buckets 1082 * such that the load factor is in the range 0.25 to 1.0. 1083 * 1084 * If we can't get the new memory then we silently fail. This is OK 1085 * because things will still work and we'll try again soon anyway. 1086 */ 1087static void 1088ng_bridge_rehash(priv_p priv) 1089{ 1090 struct ng_bridge_bucket *newTab; 1091 int oldBucket, newBucket; 1092 int newNumBuckets; 1093 u_int newMask; 1094 1095 /* Is table too full or too empty? */ 1096 if (priv->numHosts > priv->numBuckets 1097 && (priv->numBuckets << 1) <= MAX_BUCKETS) 1098 newNumBuckets = priv->numBuckets << 1; 1099 else if (priv->numHosts < (priv->numBuckets >> 2) 1100 && (priv->numBuckets >> 2) >= MIN_BUCKETS) 1101 newNumBuckets = priv->numBuckets >> 2; 1102 else 1103 return; 1104 newMask = newNumBuckets - 1; 1105 1106 /* Allocate and initialize new table */ 1107 newTab = malloc(newNumBuckets * sizeof(*newTab), 1108 M_NETGRAPH_BRIDGE, M_NOWAIT | M_ZERO); 1109 if (newTab == NULL) 1110 return; 1111 1112 /* Move all entries from old table to new table */ 1113 for (oldBucket = 0; oldBucket < priv->numBuckets; oldBucket++) { 1114 struct ng_bridge_bucket *const oldList = &priv->tab[oldBucket]; 1115 1116 while (!SLIST_EMPTY(oldList)) { 1117 struct ng_bridge_host *const host 1118 = SLIST_FIRST(oldList); 1119 1120 SLIST_REMOVE_HEAD(oldList, next); 1121 newBucket = HASH(host->addr, newMask); 1122 SLIST_INSERT_HEAD(&newTab[newBucket], host, next); 1123 } 1124 } 1125 1126 /* Replace old table with new one */ 1127 if (priv->conf.debugLevel >= 3) { 1128 log(LOG_INFO, "ng_bridge: %s: table size %d -> %d\n", 1129 ng_bridge_nodename(priv->node), 1130 priv->numBuckets, newNumBuckets); 1131 } 1132 free(priv->tab, M_NETGRAPH_BRIDGE); 1133 priv->numBuckets = newNumBuckets; 1134 priv->hashMask = newMask; 1135 priv->tab = newTab; 1136 return; 1137} 1138 1139/****************************************************************** 1140 MISC FUNCTIONS 1141******************************************************************/ 1142 1143static const struct ng_link_prefix * 1144ng_get_link_prefix(const char *name) 1145{ 1146 static const struct ng_link_prefix *pfxs[] = 1147 { &link_pfx, &uplink_pfx, }; 1148 1149 for (u_int i = 0; i < nitems(pfxs); i++) 1150 if (strncmp(pfxs[i]->prefix, name, pfxs[i]->len) == 0) 1151 return (pfxs[i]); 1152 1153 return (NULL); 1154} 1155 1156/* 1157 * Remove all hosts associated with a specific link from the hashtable. 1158 * If linkNum == -1, then remove all hosts in the table. 1159 */ 1160static void 1161ng_bridge_remove_hosts(priv_p priv, link_p link) 1162{ 1163 int bucket; 1164 1165 for (bucket = 0; bucket < priv->numBuckets; bucket++) { 1166 struct ng_bridge_host **hptr = &SLIST_FIRST(&priv->tab[bucket]); 1167 1168 while (*hptr != NULL) { 1169 struct ng_bridge_host *const host = *hptr; 1170 1171 if (link == NULL || host->link == link) { 1172 *hptr = SLIST_NEXT(host, next); 1173 free(host, M_NETGRAPH_BRIDGE); 1174 priv->numHosts--; 1175 } else 1176 hptr = &SLIST_NEXT(host, next); 1177 } 1178 } 1179} 1180 1181/* 1182 * Handle our once-per-second timeout event. We do two things: 1183 * we decrement link->loopCount for those links being muted due to 1184 * a detected loopback condition, and we remove any hosts from 1185 * the hashtable whom we haven't heard from in a long while. 1186 */ 1187static int 1188ng_bridge_unmute(hook_p hook, void *arg) 1189{ 1190 link_p link = NG_HOOK_PRIVATE(hook); 1191 node_p node = NG_HOOK_NODE(hook); 1192 priv_p priv = NG_NODE_PRIVATE(node); 1193 int *counter = arg; 1194 1195 if (link->loopCount != 0) { 1196 link->loopCount--; 1197 if (link->loopCount == 0 && priv->conf.debugLevel >= 2) { 1198 log(LOG_INFO, "ng_bridge: %s:" 1199 " restoring looped back %s\n", 1200 ng_bridge_nodename(node), NG_HOOK_NAME(hook)); 1201 } 1202 } 1203 (*counter)++; 1204 return (1); 1205} 1206 1207static void 1208ng_bridge_timeout(node_p node, hook_p hook, void *arg1, int arg2) 1209{ 1210 const priv_p priv = NG_NODE_PRIVATE(node); 1211 int bucket; 1212 int counter = 0; 1213 1214 /* Update host time counters and remove stale entries */ 1215 for (bucket = 0; bucket < priv->numBuckets; bucket++) { 1216 struct ng_bridge_host **hptr = &SLIST_FIRST(&priv->tab[bucket]); 1217 1218 while (*hptr != NULL) { 1219 struct ng_bridge_host *const host = *hptr; 1220 1221 /* Remove hosts we haven't heard from in a while */ 1222 if (++host->staleness >= priv->conf.maxStaleness) { 1223 *hptr = SLIST_NEXT(host, next); 1224 free(host, M_NETGRAPH_BRIDGE); 1225 priv->numHosts--; 1226 } else { 1227 if (host->age < 0xffff) 1228 host->age++; 1229 hptr = &SLIST_NEXT(host, next); 1230 counter++; 1231 } 1232 } 1233 } 1234 KASSERT(priv->numHosts == counter, 1235 ("%s: hosts: %d != %d", __func__, priv->numHosts, counter)); 1236 1237 /* Decrease table size if necessary */ 1238 ng_bridge_rehash(priv); 1239 1240 /* Decrease loop counter on muted looped back links */ 1241 counter = 0; 1242 NG_NODE_FOREACH_HOOK(node, ng_bridge_unmute, &counter); 1243 KASSERT(priv->numLinks == counter, 1244 ("%s: links: %d != %d", __func__, priv->numLinks, counter)); 1245 1246 /* Register a new timeout, keeping the existing node reference */ 1247 ng_callout(&priv->timer, node, NULL, hz, ng_bridge_timeout, NULL, 0); 1248} 1249 1250/* 1251 * Return node's "name", even if it doesn't have one. 1252 */ 1253static const char * 1254ng_bridge_nodename(node_cp node) 1255{ 1256 static char name[NG_NODESIZ]; 1257 1258 if (NG_NODE_HAS_NAME(node)) 1259 snprintf(name, sizeof(name), "%s", NG_NODE_NAME(node)); 1260 else 1261 snprintf(name, sizeof(name), "[%x]", ng_node2ID(node)); 1262 return name; 1263} 1264