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