165310Sarchie/* 265310Sarchie * ng_bridge.c 3139823Simp */ 4139823Simp 5139823Simp/*- 665310Sarchie * Copyright (c) 2000 Whistle Communications, Inc. 765310Sarchie * All rights reserved. 865310Sarchie * 965310Sarchie * Subject to the following obligations and disclaimer of warranty, use and 1065310Sarchie * redistribution of this software, in source or object code forms, with or 1165310Sarchie * without modifications are expressly permitted by Whistle Communications; 1265310Sarchie * provided, however, that: 1365310Sarchie * 1. Any and all reproductions of the source or object code must include the 1465310Sarchie * copyright notice above and the following disclaimer of warranties; and 1565310Sarchie * 2. No rights are granted, in any manner or form, to use Whistle 1665310Sarchie * Communications, Inc. trademarks, including the mark "WHISTLE 1765310Sarchie * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 1865310Sarchie * such appears in the above copyright notice or in the software. 1965310Sarchie * 2065310Sarchie * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 2165310Sarchie * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 2265310Sarchie * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 2365310Sarchie * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 2465310Sarchie * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 2565310Sarchie * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 2665310Sarchie * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 2765310Sarchie * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 2865310Sarchie * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 2965310Sarchie * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 3065310Sarchie * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 3165310Sarchie * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 3265310Sarchie * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 3365310Sarchie * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 3465310Sarchie * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 3565310Sarchie * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 3665310Sarchie * OF SUCH DAMAGE. 3765310Sarchie * 3865310Sarchie * Author: Archie Cobbs <archie@freebsd.org> 3965310Sarchie * 4065310Sarchie * $FreeBSD$ 4165310Sarchie */ 4265310Sarchie 4365310Sarchie/* 4465310Sarchie * ng_bridge(4) netgraph node type 4565310Sarchie * 4665310Sarchie * The node performs standard intelligent Ethernet bridging over 4765310Sarchie * each of its connected hooks, or links. A simple loop detection 4865310Sarchie * algorithm is included which disables a link for priv->conf.loopTimeout 4965310Sarchie * seconds when a host is seen to have jumped from one link to 5065310Sarchie * another within priv->conf.minStableAge seconds. 5165310Sarchie * 5265310Sarchie * We keep a hashtable that maps Ethernet addresses to host info, 5365310Sarchie * which is contained in struct ng_bridge_host's. These structures 5465310Sarchie * tell us on which link the host may be found. A host's entry will 5565310Sarchie * expire after priv->conf.maxStaleness seconds. 5665310Sarchie * 5765310Sarchie * This node is optimzed for stable networks, where machines jump 5865310Sarchie * from one port to the other only rarely. 5965310Sarchie */ 6065310Sarchie 6165310Sarchie#include <sys/param.h> 6265310Sarchie#include <sys/systm.h> 6365310Sarchie#include <sys/kernel.h> 64185895Szec#include <sys/lock.h> 6565310Sarchie#include <sys/malloc.h> 6665310Sarchie#include <sys/mbuf.h> 6765310Sarchie#include <sys/errno.h> 68185895Szec#include <sys/rwlock.h> 6965310Sarchie#include <sys/syslog.h> 7065310Sarchie#include <sys/socket.h> 7165310Sarchie#include <sys/ctype.h> 7265310Sarchie 7365310Sarchie#include <net/if.h> 7465310Sarchie#include <net/ethernet.h> 75196019Srwatson#include <net/vnet.h> 7665310Sarchie 7765310Sarchie#include <netinet/in.h> 78200582Sluigi#if 0 /* not used yet */ 7965310Sarchie#include <netinet/ip_fw.h> 80200582Sluigi#endif 8165310Sarchie#include <netgraph/ng_message.h> 8265310Sarchie#include <netgraph/netgraph.h> 8365310Sarchie#include <netgraph/ng_parse.h> 8465310Sarchie#include <netgraph/ng_bridge.h> 8565310Sarchie 8670870Sjulian#ifdef NG_SEPARATE_MALLOC 87227293Sedstatic MALLOC_DEFINE(M_NETGRAPH_BRIDGE, "netgraph_bridge", 88227293Sed "netgraph bridge node"); 8970870Sjulian#else 9070870Sjulian#define M_NETGRAPH_BRIDGE M_NETGRAPH 9170870Sjulian#endif 9270870Sjulian 9365310Sarchie/* Per-link private data */ 9465310Sarchiestruct ng_bridge_link { 9565310Sarchie hook_p hook; /* netgraph hook */ 9665310Sarchie u_int16_t loopCount; /* loop ignore timer */ 9765310Sarchie struct ng_bridge_link_stats stats; /* link stats */ 9865310Sarchie}; 9965310Sarchie 10065310Sarchie/* Per-node private data */ 10165310Sarchiestruct ng_bridge_private { 10265310Sarchie struct ng_bridge_bucket *tab; /* hash table bucket array */ 10365310Sarchie struct ng_bridge_link *links[NG_BRIDGE_MAX_LINKS]; 10465310Sarchie struct ng_bridge_config conf; /* node configuration */ 10565310Sarchie node_p node; /* netgraph node */ 10665310Sarchie u_int numHosts; /* num entries in table */ 10765310Sarchie u_int numBuckets; /* num buckets in table */ 10865310Sarchie u_int hashMask; /* numBuckets - 1 */ 10965310Sarchie int numLinks; /* num connected links */ 110207680Szec int persistent; /* can exist w/o hooks */ 11165310Sarchie struct callout timer; /* one second periodic timer */ 11265310Sarchie}; 11365310Sarchietypedef struct ng_bridge_private *priv_p; 11465310Sarchie 11565310Sarchie/* Information about a host, stored in a hash table entry */ 11665310Sarchiestruct ng_bridge_hent { 11765310Sarchie struct ng_bridge_host host; /* actual host info */ 11865310Sarchie SLIST_ENTRY(ng_bridge_hent) next; /* next entry in bucket */ 11965310Sarchie}; 12065310Sarchie 12165310Sarchie/* Hash table bucket declaration */ 12265310SarchieSLIST_HEAD(ng_bridge_bucket, ng_bridge_hent); 12365310Sarchie 12465310Sarchie/* Netgraph node methods */ 12565310Sarchiestatic ng_constructor_t ng_bridge_constructor; 12665310Sarchiestatic ng_rcvmsg_t ng_bridge_rcvmsg; 12770700Sjulianstatic ng_shutdown_t ng_bridge_shutdown; 12865310Sarchiestatic ng_newhook_t ng_bridge_newhook; 12965310Sarchiestatic ng_rcvdata_t ng_bridge_rcvdata; 13065310Sarchiestatic ng_disconnect_t ng_bridge_disconnect; 13165310Sarchie 13265310Sarchie/* Other internal functions */ 13365310Sarchiestatic struct ng_bridge_host *ng_bridge_get(priv_p priv, const u_char *addr); 13465310Sarchiestatic int ng_bridge_put(priv_p priv, const u_char *addr, int linkNum); 13565310Sarchiestatic void ng_bridge_rehash(priv_p priv); 13665310Sarchiestatic void ng_bridge_remove_hosts(priv_p priv, int linkNum); 137138834Sglebiusstatic void ng_bridge_timeout(node_p node, hook_p hook, void *arg1, int arg2); 13865310Sarchiestatic const char *ng_bridge_nodename(node_p node); 13965310Sarchie 14065310Sarchie/* Ethernet broadcast */ 14165310Sarchiestatic const u_char ng_bridge_bcast_addr[ETHER_ADDR_LEN] = 14265310Sarchie { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 14365310Sarchie 14465310Sarchie/* Store each hook's link number in the private field */ 14565310Sarchie#define LINK_NUM(hook) (*(u_int16_t *)(&(hook)->private)) 14665310Sarchie 14765310Sarchie/* Compare Ethernet addresses using 32 and 16 bit words instead of bytewise */ 14865310Sarchie#define ETHER_EQUAL(a,b) (((const u_int32_t *)(a))[0] \ 14965310Sarchie == ((const u_int32_t *)(b))[0] \ 15065310Sarchie && ((const u_int16_t *)(a))[2] \ 15165310Sarchie == ((const u_int16_t *)(b))[2]) 15265310Sarchie 15365310Sarchie/* Minimum and maximum number of hash buckets. Must be a power of two. */ 15465310Sarchie#define MIN_BUCKETS (1 << 5) /* 32 */ 15565310Sarchie#define MAX_BUCKETS (1 << 14) /* 16384 */ 15665310Sarchie 15765310Sarchie/* Configuration default values */ 15865310Sarchie#define DEFAULT_LOOP_TIMEOUT 60 15965310Sarchie#define DEFAULT_MAX_STALENESS (15 * 60) /* same as ARP timeout */ 16065310Sarchie#define DEFAULT_MIN_STABLE_AGE 1 16165310Sarchie 16265310Sarchie/****************************************************************** 16365310Sarchie NETGRAPH PARSE TYPES 16465310Sarchie******************************************************************/ 16565310Sarchie 16665310Sarchie/* 16765310Sarchie * How to determine the length of the table returned by NGM_BRIDGE_GET_TABLE 16865310Sarchie */ 16965310Sarchiestatic int 17065310Sarchieng_bridge_getTableLength(const struct ng_parse_type *type, 17165310Sarchie const u_char *start, const u_char *buf) 17265310Sarchie{ 17365310Sarchie const struct ng_bridge_host_ary *const hary 17465310Sarchie = (const struct ng_bridge_host_ary *)(buf - sizeof(u_int32_t)); 17565310Sarchie 17665310Sarchie return hary->numHosts; 17765310Sarchie} 17865310Sarchie 17965310Sarchie/* Parse type for struct ng_bridge_host_ary */ 18097685Sarchiestatic const struct ng_parse_struct_field ng_bridge_host_type_fields[] 181123600Sru = NG_BRIDGE_HOST_TYPE_INFO(&ng_parse_enaddr_type); 18265310Sarchiestatic const struct ng_parse_type ng_bridge_host_type = { 18365310Sarchie &ng_parse_struct_type, 18497685Sarchie &ng_bridge_host_type_fields 18565310Sarchie}; 18665310Sarchiestatic const struct ng_parse_array_info ng_bridge_hary_type_info = { 18765310Sarchie &ng_bridge_host_type, 18865310Sarchie ng_bridge_getTableLength 18965310Sarchie}; 19065310Sarchiestatic const struct ng_parse_type ng_bridge_hary_type = { 19165310Sarchie &ng_parse_array_type, 19265310Sarchie &ng_bridge_hary_type_info 19365310Sarchie}; 19497685Sarchiestatic const struct ng_parse_struct_field ng_bridge_host_ary_type_fields[] 19565310Sarchie = NG_BRIDGE_HOST_ARY_TYPE_INFO(&ng_bridge_hary_type); 19665310Sarchiestatic const struct ng_parse_type ng_bridge_host_ary_type = { 19765310Sarchie &ng_parse_struct_type, 19897685Sarchie &ng_bridge_host_ary_type_fields 19965310Sarchie}; 20065310Sarchie 20165310Sarchie/* Parse type for struct ng_bridge_config */ 20265310Sarchiestatic const struct ng_parse_fixedarray_info ng_bridge_ipfwary_type_info = { 20365310Sarchie &ng_parse_uint8_type, 20465310Sarchie NG_BRIDGE_MAX_LINKS 20565310Sarchie}; 20665310Sarchiestatic const struct ng_parse_type ng_bridge_ipfwary_type = { 20765310Sarchie &ng_parse_fixedarray_type, 20865310Sarchie &ng_bridge_ipfwary_type_info 20965310Sarchie}; 21097685Sarchiestatic const struct ng_parse_struct_field ng_bridge_config_type_fields[] 21165310Sarchie = NG_BRIDGE_CONFIG_TYPE_INFO(&ng_bridge_ipfwary_type); 21265310Sarchiestatic const struct ng_parse_type ng_bridge_config_type = { 21365310Sarchie &ng_parse_struct_type, 21497685Sarchie &ng_bridge_config_type_fields 21565310Sarchie}; 21665310Sarchie 21765310Sarchie/* Parse type for struct ng_bridge_link_stat */ 21897685Sarchiestatic const struct ng_parse_struct_field ng_bridge_stats_type_fields[] 21997685Sarchie = NG_BRIDGE_STATS_TYPE_INFO; 22065310Sarchiestatic const struct ng_parse_type ng_bridge_stats_type = { 22165310Sarchie &ng_parse_struct_type, 22297685Sarchie &ng_bridge_stats_type_fields 22365310Sarchie}; 22465310Sarchie 22565310Sarchie/* List of commands and how to convert arguments to/from ASCII */ 22665310Sarchiestatic const struct ng_cmdlist ng_bridge_cmdlist[] = { 22765310Sarchie { 22865310Sarchie NGM_BRIDGE_COOKIE, 22965310Sarchie NGM_BRIDGE_SET_CONFIG, 23065310Sarchie "setconfig", 23165310Sarchie &ng_bridge_config_type, 23265310Sarchie NULL 23365310Sarchie }, 23465310Sarchie { 23565310Sarchie NGM_BRIDGE_COOKIE, 23665310Sarchie NGM_BRIDGE_GET_CONFIG, 23765310Sarchie "getconfig", 23865310Sarchie NULL, 23965310Sarchie &ng_bridge_config_type 24065310Sarchie }, 24165310Sarchie { 24265310Sarchie NGM_BRIDGE_COOKIE, 24365310Sarchie NGM_BRIDGE_RESET, 24465310Sarchie "reset", 24565310Sarchie NULL, 24665310Sarchie NULL 24765310Sarchie }, 24865310Sarchie { 24965310Sarchie NGM_BRIDGE_COOKIE, 25065310Sarchie NGM_BRIDGE_GET_STATS, 25165310Sarchie "getstats", 25265310Sarchie &ng_parse_uint32_type, 25365310Sarchie &ng_bridge_stats_type 25465310Sarchie }, 25565310Sarchie { 25665310Sarchie NGM_BRIDGE_COOKIE, 25765310Sarchie NGM_BRIDGE_CLR_STATS, 25865310Sarchie "clrstats", 25965310Sarchie &ng_parse_uint32_type, 26065310Sarchie NULL 26165310Sarchie }, 26265310Sarchie { 26365310Sarchie NGM_BRIDGE_COOKIE, 26465310Sarchie NGM_BRIDGE_GETCLR_STATS, 26565310Sarchie "getclrstats", 26665310Sarchie &ng_parse_uint32_type, 26765310Sarchie &ng_bridge_stats_type 26865310Sarchie }, 26965310Sarchie { 27065310Sarchie NGM_BRIDGE_COOKIE, 27165310Sarchie NGM_BRIDGE_GET_TABLE, 27265310Sarchie "gettable", 27365310Sarchie NULL, 27465310Sarchie &ng_bridge_host_ary_type 27565310Sarchie }, 276207680Szec { 277207680Szec NGM_BRIDGE_COOKIE, 278207680Szec NGM_BRIDGE_SET_PERSISTENT, 279207680Szec "setpersistent", 280207680Szec NULL, 281207680Szec NULL 282207680Szec }, 28365310Sarchie { 0 } 28465310Sarchie}; 28565310Sarchie 28665310Sarchie/* Node type descriptor */ 28765310Sarchiestatic struct ng_type ng_bridge_typestruct = { 288129823Sjulian .version = NG_ABI_VERSION, 289129823Sjulian .name = NG_BRIDGE_NODE_TYPE, 290129823Sjulian .constructor = ng_bridge_constructor, 291129823Sjulian .rcvmsg = ng_bridge_rcvmsg, 292129823Sjulian .shutdown = ng_bridge_shutdown, 293129823Sjulian .newhook = ng_bridge_newhook, 294129823Sjulian .rcvdata = ng_bridge_rcvdata, 295129823Sjulian .disconnect = ng_bridge_disconnect, 296129823Sjulian .cmdlist = ng_bridge_cmdlist, 29765310Sarchie}; 29866887SarchieNETGRAPH_INIT(bridge, &ng_bridge_typestruct); 29965310Sarchie 30065310Sarchie/****************************************************************** 30165310Sarchie NETGRAPH NODE METHODS 30265310Sarchie******************************************************************/ 30365310Sarchie 30465310Sarchie/* 30565310Sarchie * Node constructor 30665310Sarchie */ 30765310Sarchiestatic int 30870700Sjulianng_bridge_constructor(node_p node) 30965310Sarchie{ 31065310Sarchie priv_p priv; 31165310Sarchie 31265310Sarchie /* Allocate and initialize private info */ 313220768Sglebius priv = malloc(sizeof(*priv), M_NETGRAPH_BRIDGE, M_WAITOK | M_ZERO); 314138834Sglebius ng_callout_init(&priv->timer); 31565310Sarchie 31665310Sarchie /* Allocate and initialize hash table, etc. */ 317184214Sdes priv->tab = malloc(MIN_BUCKETS * sizeof(*priv->tab), 318220768Sglebius M_NETGRAPH_BRIDGE, M_WAITOK | M_ZERO); 31965310Sarchie priv->numBuckets = MIN_BUCKETS; 32065310Sarchie priv->hashMask = MIN_BUCKETS - 1; 32165310Sarchie priv->conf.debugLevel = 1; 32265310Sarchie priv->conf.loopTimeout = DEFAULT_LOOP_TIMEOUT; 32365310Sarchie priv->conf.maxStaleness = DEFAULT_MAX_STALENESS; 32465310Sarchie priv->conf.minStableAge = DEFAULT_MIN_STABLE_AGE; 32565310Sarchie 32670700Sjulian /* 32770700Sjulian * This node has all kinds of stuff that could be screwed by SMP. 32870700Sjulian * Until it gets it's own internal protection, we go through in 32970700Sjulian * single file. This could hurt a machine bridging beteen two 33070700Sjulian * GB ethernets so it should be fixed. 33170700Sjulian * When it's fixed the process SHOULD NOT SLEEP, spinlocks please! 33270700Sjulian * (and atomic ops ) 33370700Sjulian */ 33470784Sjulian NG_NODE_FORCE_WRITER(node); 33570784Sjulian NG_NODE_SET_PRIVATE(node, priv); 33670700Sjulian priv->node = node; 33765310Sarchie 33887997Sarchie /* Start timer; timer is always running while node is alive */ 339138834Sglebius ng_callout(&priv->timer, node, NULL, hz, ng_bridge_timeout, NULL, 0); 34087997Sarchie 34187997Sarchie /* Done */ 34265310Sarchie return (0); 34365310Sarchie} 34465310Sarchie 34565310Sarchie/* 34665310Sarchie * Method for attaching a new hook 34765310Sarchie */ 34865310Sarchiestatic int 34965310Sarchieng_bridge_newhook(node_p node, hook_p hook, const char *name) 35065310Sarchie{ 35170784Sjulian const priv_p priv = NG_NODE_PRIVATE(node); 35265310Sarchie 35365310Sarchie /* Check for a link hook */ 35465310Sarchie if (strncmp(name, NG_BRIDGE_HOOK_LINK_PREFIX, 35565310Sarchie strlen(NG_BRIDGE_HOOK_LINK_PREFIX)) == 0) { 35665310Sarchie const char *cp; 35765310Sarchie char *eptr; 35865310Sarchie u_long linkNum; 35965310Sarchie 36065310Sarchie cp = name + strlen(NG_BRIDGE_HOOK_LINK_PREFIX); 36165310Sarchie if (!isdigit(*cp) || (cp[0] == '0' && cp[1] != '\0')) 36265310Sarchie return (EINVAL); 36365310Sarchie linkNum = strtoul(cp, &eptr, 10); 36465310Sarchie if (*eptr != '\0' || linkNum >= NG_BRIDGE_MAX_LINKS) 36565310Sarchie return (EINVAL); 36665310Sarchie if (priv->links[linkNum] != NULL) 36765310Sarchie return (EISCONN); 368184214Sdes priv->links[linkNum] = malloc(sizeof(*priv->links[linkNum]), 369184214Sdes M_NETGRAPH_BRIDGE, M_NOWAIT|M_ZERO); 37065310Sarchie if (priv->links[linkNum] == NULL) 37165310Sarchie return (ENOMEM); 37265310Sarchie priv->links[linkNum]->hook = hook; 37370784Sjulian NG_HOOK_SET_PRIVATE(hook, (void *)linkNum); 37465310Sarchie priv->numLinks++; 37565310Sarchie return (0); 37665310Sarchie } 37765310Sarchie 37865310Sarchie /* Unknown hook name */ 37965310Sarchie return (EINVAL); 38065310Sarchie} 38165310Sarchie 38265310Sarchie/* 38365310Sarchie * Receive a control message 38465310Sarchie */ 38565310Sarchiestatic int 38670700Sjulianng_bridge_rcvmsg(node_p node, item_p item, hook_p lasthook) 38765310Sarchie{ 38870784Sjulian const priv_p priv = NG_NODE_PRIVATE(node); 38965310Sarchie struct ng_mesg *resp = NULL; 39065310Sarchie int error = 0; 39170700Sjulian struct ng_mesg *msg; 39265310Sarchie 39370700Sjulian NGI_GET_MSG(item, msg); 39465310Sarchie switch (msg->header.typecookie) { 39565310Sarchie case NGM_BRIDGE_COOKIE: 39665310Sarchie switch (msg->header.cmd) { 39765310Sarchie case NGM_BRIDGE_GET_CONFIG: 39865310Sarchie { 39965310Sarchie struct ng_bridge_config *conf; 40065310Sarchie 40165310Sarchie NG_MKRESPONSE(resp, msg, 40265310Sarchie sizeof(struct ng_bridge_config), M_NOWAIT); 40365310Sarchie if (resp == NULL) { 40465310Sarchie error = ENOMEM; 40565310Sarchie break; 40665310Sarchie } 40765310Sarchie conf = (struct ng_bridge_config *)resp->data; 40865310Sarchie *conf = priv->conf; /* no sanity checking needed */ 40965310Sarchie break; 41065310Sarchie } 41165310Sarchie case NGM_BRIDGE_SET_CONFIG: 41265310Sarchie { 41365310Sarchie struct ng_bridge_config *conf; 41465310Sarchie int i; 41565310Sarchie 41665310Sarchie if (msg->header.arglen 41765310Sarchie != sizeof(struct ng_bridge_config)) { 41865310Sarchie error = EINVAL; 41965310Sarchie break; 42065310Sarchie } 42165310Sarchie conf = (struct ng_bridge_config *)msg->data; 42265310Sarchie priv->conf = *conf; 42365310Sarchie for (i = 0; i < NG_BRIDGE_MAX_LINKS; i++) 42465310Sarchie priv->conf.ipfw[i] = !!priv->conf.ipfw[i]; 42565310Sarchie break; 42665310Sarchie } 42765310Sarchie case NGM_BRIDGE_RESET: 42865310Sarchie { 42965310Sarchie int i; 43065310Sarchie 43165310Sarchie /* Flush all entries in the hash table */ 43265310Sarchie ng_bridge_remove_hosts(priv, -1); 43365310Sarchie 43465310Sarchie /* Reset all loop detection counters and stats */ 43565310Sarchie for (i = 0; i < NG_BRIDGE_MAX_LINKS; i++) { 43665310Sarchie if (priv->links[i] == NULL) 43765310Sarchie continue; 43865310Sarchie priv->links[i]->loopCount = 0; 43965310Sarchie bzero(&priv->links[i]->stats, 44065310Sarchie sizeof(priv->links[i]->stats)); 44165310Sarchie } 44265310Sarchie break; 44365310Sarchie } 44465310Sarchie case NGM_BRIDGE_GET_STATS: 44565310Sarchie case NGM_BRIDGE_CLR_STATS: 44665310Sarchie case NGM_BRIDGE_GETCLR_STATS: 44765310Sarchie { 44865310Sarchie struct ng_bridge_link *link; 44965310Sarchie int linkNum; 45065310Sarchie 45165310Sarchie /* Get link number */ 45265310Sarchie if (msg->header.arglen != sizeof(u_int32_t)) { 45365310Sarchie error = EINVAL; 45465310Sarchie break; 45565310Sarchie } 45665310Sarchie linkNum = *((u_int32_t *)msg->data); 45765310Sarchie if (linkNum < 0 || linkNum >= NG_BRIDGE_MAX_LINKS) { 45865310Sarchie error = EINVAL; 45965310Sarchie break; 46065310Sarchie } 46165310Sarchie if ((link = priv->links[linkNum]) == NULL) { 46265310Sarchie error = ENOTCONN; 46365310Sarchie break; 46465310Sarchie } 46565310Sarchie 46665310Sarchie /* Get/clear stats */ 46765310Sarchie if (msg->header.cmd != NGM_BRIDGE_CLR_STATS) { 46865310Sarchie NG_MKRESPONSE(resp, msg, 46965310Sarchie sizeof(link->stats), M_NOWAIT); 47065310Sarchie if (resp == NULL) { 47165310Sarchie error = ENOMEM; 47265310Sarchie break; 47365310Sarchie } 47465310Sarchie bcopy(&link->stats, 47565310Sarchie resp->data, sizeof(link->stats)); 47665310Sarchie } 47765310Sarchie if (msg->header.cmd != NGM_BRIDGE_GET_STATS) 47865310Sarchie bzero(&link->stats, sizeof(link->stats)); 47965310Sarchie break; 48065310Sarchie } 48165310Sarchie case NGM_BRIDGE_GET_TABLE: 48265310Sarchie { 48365310Sarchie struct ng_bridge_host_ary *ary; 48465310Sarchie struct ng_bridge_hent *hent; 48565310Sarchie int i = 0, bucket; 48665310Sarchie 48765310Sarchie NG_MKRESPONSE(resp, msg, sizeof(*ary) 48865310Sarchie + (priv->numHosts * sizeof(*ary->hosts)), M_NOWAIT); 48965310Sarchie if (resp == NULL) { 49065310Sarchie error = ENOMEM; 49165310Sarchie break; 49265310Sarchie } 49365310Sarchie ary = (struct ng_bridge_host_ary *)resp->data; 49465310Sarchie ary->numHosts = priv->numHosts; 49565310Sarchie for (bucket = 0; bucket < priv->numBuckets; bucket++) { 49665310Sarchie SLIST_FOREACH(hent, &priv->tab[bucket], next) 49765310Sarchie ary->hosts[i++] = hent->host; 49865310Sarchie } 49965310Sarchie break; 50065310Sarchie } 501207680Szec case NGM_BRIDGE_SET_PERSISTENT: 502207680Szec { 503207680Szec priv->persistent = 1; 504207680Szec break; 505207680Szec } 50665310Sarchie default: 50765310Sarchie error = EINVAL; 50865310Sarchie break; 50965310Sarchie } 51065310Sarchie break; 51165310Sarchie default: 51265310Sarchie error = EINVAL; 51365310Sarchie break; 51465310Sarchie } 51565310Sarchie 51665310Sarchie /* Done */ 51770700Sjulian NG_RESPOND_MSG(error, node, item, resp); 51870700Sjulian NG_FREE_MSG(msg); 51965310Sarchie return (error); 52065310Sarchie} 52165310Sarchie 52265310Sarchie/* 52365310Sarchie * Receive data on a hook 52465310Sarchie */ 52565310Sarchiestatic int 52670700Sjulianng_bridge_rcvdata(hook_p hook, item_p item) 52765310Sarchie{ 52870784Sjulian const node_p node = NG_HOOK_NODE(hook); 52970784Sjulian const priv_p priv = NG_NODE_PRIVATE(node); 53065310Sarchie struct ng_bridge_host *host; 53165310Sarchie struct ng_bridge_link *link; 53265310Sarchie struct ether_header *eh; 533130931Sgreen int error = 0, linkNum, linksSeen; 53470700Sjulian int manycast; 53570700Sjulian struct mbuf *m; 53670700Sjulian struct ng_bridge_link *firstLink; 53765310Sarchie 53870700Sjulian NGI_GET_M(item, m); 53965310Sarchie /* Get link number */ 540106665Sjhb linkNum = (intptr_t)NG_HOOK_PRIVATE(hook); 54165310Sarchie KASSERT(linkNum >= 0 && linkNum < NG_BRIDGE_MAX_LINKS, 54287599Sobrien ("%s: linkNum=%u", __func__, linkNum)); 54365310Sarchie link = priv->links[linkNum]; 54487599Sobrien KASSERT(link != NULL, ("%s: link%d null", __func__, linkNum)); 54565310Sarchie 54665310Sarchie /* Sanity check packet and pull up header */ 54765310Sarchie if (m->m_pkthdr.len < ETHER_HDR_LEN) { 54865310Sarchie link->stats.recvRunts++; 54970700Sjulian NG_FREE_ITEM(item); 55070700Sjulian NG_FREE_M(m); 55165310Sarchie return (EINVAL); 55265310Sarchie } 55365310Sarchie if (m->m_len < ETHER_HDR_LEN && !(m = m_pullup(m, ETHER_HDR_LEN))) { 55465310Sarchie link->stats.memoryFailures++; 55570700Sjulian NG_FREE_ITEM(item); 55665310Sarchie return (ENOBUFS); 55765310Sarchie } 55865310Sarchie eh = mtod(m, struct ether_header *); 55965310Sarchie if ((eh->ether_shost[0] & 1) != 0) { 56065310Sarchie link->stats.recvInvalid++; 56170700Sjulian NG_FREE_ITEM(item); 56270700Sjulian NG_FREE_M(m); 56365310Sarchie return (EINVAL); 56465310Sarchie } 56565310Sarchie 56665310Sarchie /* Is link disabled due to a loopback condition? */ 56765310Sarchie if (link->loopCount != 0) { 56865310Sarchie link->stats.loopDrops++; 56970700Sjulian NG_FREE_ITEM(item); 57070700Sjulian NG_FREE_M(m); 57165310Sarchie return (ELOOP); /* XXX is this an appropriate error? */ 57265310Sarchie } 57365310Sarchie 57465310Sarchie /* Update stats */ 57565310Sarchie link->stats.recvPackets++; 57665310Sarchie link->stats.recvOctets += m->m_pkthdr.len; 57765310Sarchie if ((manycast = (eh->ether_dhost[0] & 1)) != 0) { 57865310Sarchie if (ETHER_EQUAL(eh->ether_dhost, ng_bridge_bcast_addr)) { 57965310Sarchie link->stats.recvBroadcasts++; 58065310Sarchie manycast = 2; 58165310Sarchie } else 58265310Sarchie link->stats.recvMulticasts++; 58365310Sarchie } 58465310Sarchie 58565310Sarchie /* Look up packet's source Ethernet address in hashtable */ 58665310Sarchie if ((host = ng_bridge_get(priv, eh->ether_shost)) != NULL) { 58765310Sarchie 58865310Sarchie /* Update time since last heard from this host */ 58965310Sarchie host->staleness = 0; 59065310Sarchie 59165310Sarchie /* Did host jump to a different link? */ 59265310Sarchie if (host->linkNum != linkNum) { 59365310Sarchie 59465310Sarchie /* 59565310Sarchie * If the host's old link was recently established 59665310Sarchie * on the old link and it's already jumped to a new 59765310Sarchie * link, declare a loopback condition. 59865310Sarchie */ 59965310Sarchie if (host->age < priv->conf.minStableAge) { 60065310Sarchie 60165310Sarchie /* Log the problem */ 60265310Sarchie if (priv->conf.debugLevel >= 2) { 60365310Sarchie struct ifnet *ifp = m->m_pkthdr.rcvif; 60465310Sarchie char suffix[32]; 60565310Sarchie 60665310Sarchie if (ifp != NULL) 60765310Sarchie snprintf(suffix, sizeof(suffix), 608121816Sbrooks " (%s)", ifp->if_xname); 60965310Sarchie else 61065310Sarchie *suffix = '\0'; 61165310Sarchie log(LOG_WARNING, "ng_bridge: %s:" 61265310Sarchie " loopback detected on %s%s\n", 61365310Sarchie ng_bridge_nodename(node), 61470784Sjulian NG_HOOK_NAME(hook), suffix); 61565310Sarchie } 61665310Sarchie 61765310Sarchie /* Mark link as linka non grata */ 61865310Sarchie link->loopCount = priv->conf.loopTimeout; 61965310Sarchie link->stats.loopDetects++; 62065310Sarchie 62165310Sarchie /* Forget all hosts on this link */ 62265310Sarchie ng_bridge_remove_hosts(priv, linkNum); 62365310Sarchie 62465310Sarchie /* Drop packet */ 62565310Sarchie link->stats.loopDrops++; 62670700Sjulian NG_FREE_ITEM(item); 62770700Sjulian NG_FREE_M(m); 62865310Sarchie return (ELOOP); /* XXX appropriate? */ 62965310Sarchie } 63065310Sarchie 63165310Sarchie /* Move host over to new link */ 63265310Sarchie host->linkNum = linkNum; 63365310Sarchie host->age = 0; 63465310Sarchie } 63565310Sarchie } else { 63665310Sarchie if (!ng_bridge_put(priv, eh->ether_shost, linkNum)) { 63765310Sarchie link->stats.memoryFailures++; 63870700Sjulian NG_FREE_ITEM(item); 63970700Sjulian NG_FREE_M(m); 64065310Sarchie return (ENOMEM); 64165310Sarchie } 64265310Sarchie } 64365310Sarchie 64465310Sarchie /* Run packet through ipfw processing, if enabled */ 645133920Sandre#if 0 646197952Sjulian if (priv->conf.ipfw[linkNum] && V_fw_enable && V_ip_fw_chk_ptr != NULL) { 64765310Sarchie /* XXX not implemented yet */ 64865310Sarchie } 649133920Sandre#endif 65065310Sarchie 65165310Sarchie /* 65265310Sarchie * If unicast and destination host known, deliver to host's link, 65365310Sarchie * unless it is the same link as the packet came in on. 65465310Sarchie */ 65565310Sarchie if (!manycast) { 65665310Sarchie 65765310Sarchie /* Determine packet destination link */ 65865310Sarchie if ((host = ng_bridge_get(priv, eh->ether_dhost)) != NULL) { 65965310Sarchie struct ng_bridge_link *const destLink 66065310Sarchie = priv->links[host->linkNum]; 66165310Sarchie 66265310Sarchie /* If destination same as incoming link, do nothing */ 66365310Sarchie KASSERT(destLink != NULL, 66487599Sobrien ("%s: link%d null", __func__, host->linkNum)); 66565310Sarchie if (destLink == link) { 66670700Sjulian NG_FREE_ITEM(item); 66770700Sjulian NG_FREE_M(m); 66865310Sarchie return (0); 66965310Sarchie } 67065310Sarchie 67165310Sarchie /* Deliver packet out the destination link */ 67265310Sarchie destLink->stats.xmitPackets++; 67365310Sarchie destLink->stats.xmitOctets += m->m_pkthdr.len; 67470700Sjulian NG_FWD_NEW_DATA(error, item, destLink->hook, m); 67565310Sarchie return (error); 67665310Sarchie } 67765310Sarchie 67865310Sarchie /* Destination host is not known */ 67965310Sarchie link->stats.recvUnknown++; 68065310Sarchie } 68165310Sarchie 68265310Sarchie /* Distribute unknown, multicast, broadcast pkts to all other links */ 68370700Sjulian firstLink = NULL; 684130931Sgreen for (linkNum = linksSeen = 0; linksSeen <= priv->numLinks; linkNum++) { 68570700Sjulian struct ng_bridge_link *destLink; 68670700Sjulian struct mbuf *m2 = NULL; 68765310Sarchie 68870700Sjulian /* 68970700Sjulian * If we have checked all the links then now 69070700Sjulian * send the original on its reserved link 69170700Sjulian */ 692130931Sgreen if (linksSeen == priv->numLinks) { 69370700Sjulian /* If we never saw a good link, leave. */ 69470700Sjulian if (firstLink == NULL) { 69570700Sjulian NG_FREE_ITEM(item); 69670700Sjulian NG_FREE_M(m); 69770700Sjulian return (0); 69870700Sjulian } 69970700Sjulian destLink = firstLink; 70070700Sjulian } else { 70170700Sjulian destLink = priv->links[linkNum]; 702130931Sgreen if (destLink != NULL) 703130931Sgreen linksSeen++; 70470700Sjulian /* Skip incoming link and disconnected links */ 70570700Sjulian if (destLink == NULL || destLink == link) { 70670700Sjulian continue; 70770700Sjulian } 70870700Sjulian if (firstLink == NULL) { 70970700Sjulian /* 71070700Sjulian * This is the first usable link we have found. 71170700Sjulian * Reserve it for the originals. 71270700Sjulian * If we never find another we save a copy. 71370700Sjulian */ 71470700Sjulian firstLink = destLink; 71570700Sjulian continue; 71670700Sjulian } 71765310Sarchie 71870700Sjulian /* 71970700Sjulian * It's usable link but not the reserved (first) one. 720131155Sjulian * Copy mbuf info for sending. 72170700Sjulian */ 722243882Sglebius m2 = m_dup(m, M_NOWAIT); /* XXX m_copypacket() */ 72365310Sarchie if (m2 == NULL) { 72465310Sarchie link->stats.memoryFailures++; 72570700Sjulian NG_FREE_ITEM(item); 72670700Sjulian NG_FREE_M(m); 72765310Sarchie return (ENOBUFS); 72865310Sarchie } 72965310Sarchie } 73065310Sarchie 73165310Sarchie /* Update stats */ 73265310Sarchie destLink->stats.xmitPackets++; 73365310Sarchie destLink->stats.xmitOctets += m->m_pkthdr.len; 73465310Sarchie switch (manycast) { 73565310Sarchie case 0: /* unicast */ 73665310Sarchie break; 73765310Sarchie case 1: /* multicast */ 73865310Sarchie destLink->stats.xmitMulticasts++; 73965310Sarchie break; 74065310Sarchie case 2: /* broadcast */ 74165310Sarchie destLink->stats.xmitBroadcasts++; 74265310Sarchie break; 74365310Sarchie } 74465310Sarchie 74565310Sarchie /* Send packet */ 74670700Sjulian if (destLink == firstLink) { 74770700Sjulian /* 74870700Sjulian * If we've sent all the others, send the original 74970700Sjulian * on the first link we found. 75070700Sjulian */ 75170700Sjulian NG_FWD_NEW_DATA(error, item, destLink->hook, m); 75270700Sjulian break; /* always done last - not really needed. */ 75370700Sjulian } else { 754131155Sjulian NG_SEND_DATA_ONLY(error, destLink->hook, m2); 75570700Sjulian } 75665310Sarchie } 75765310Sarchie return (error); 75865310Sarchie} 75965310Sarchie 76065310Sarchie/* 76165310Sarchie * Shutdown node 76265310Sarchie */ 76365310Sarchiestatic int 76470700Sjulianng_bridge_shutdown(node_p node) 76565310Sarchie{ 76670784Sjulian const priv_p priv = NG_NODE_PRIVATE(node); 76765310Sarchie 76887997Sarchie /* 769141574Sru * Shut down everything including the timer. Even if the 770141574Sru * callout has already been dequeued and is about to be 771141574Sru * run, ng_bridge_timeout() won't be fired as the node 772141574Sru * is already marked NGF_INVALID, so we're safe to free 773141574Sru * the node now. 77487997Sarchie */ 77565310Sarchie KASSERT(priv->numLinks == 0 && priv->numHosts == 0, 77665310Sarchie ("%s: numLinks=%d numHosts=%d", 77787599Sobrien __func__, priv->numLinks, priv->numHosts)); 778141574Sru ng_uncallout(&priv->timer, node); 779141574Sru NG_NODE_SET_PRIVATE(node, NULL); 780141574Sru NG_NODE_UNREF(node); 781184205Sdes free(priv->tab, M_NETGRAPH_BRIDGE); 782184205Sdes free(priv, M_NETGRAPH_BRIDGE); 78365310Sarchie return (0); 78465310Sarchie} 78565310Sarchie 78665310Sarchie/* 78765310Sarchie * Hook disconnection. 78865310Sarchie */ 78965310Sarchiestatic int 79065310Sarchieng_bridge_disconnect(hook_p hook) 79165310Sarchie{ 79270784Sjulian const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 79365310Sarchie int linkNum; 79465310Sarchie 79565310Sarchie /* Get link number */ 796106665Sjhb linkNum = (intptr_t)NG_HOOK_PRIVATE(hook); 79765310Sarchie KASSERT(linkNum >= 0 && linkNum < NG_BRIDGE_MAX_LINKS, 79887599Sobrien ("%s: linkNum=%u", __func__, linkNum)); 79965310Sarchie 80065310Sarchie /* Remove all hosts associated with this link */ 80165310Sarchie ng_bridge_remove_hosts(priv, linkNum); 80265310Sarchie 80365310Sarchie /* Free associated link information */ 80487599Sobrien KASSERT(priv->links[linkNum] != NULL, ("%s: no link", __func__)); 805184205Sdes free(priv->links[linkNum], M_NETGRAPH_BRIDGE); 80665310Sarchie priv->links[linkNum] = NULL; 80765310Sarchie priv->numLinks--; 80865310Sarchie 80965310Sarchie /* If no more hooks, go away */ 81070784Sjulian if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 811207680Szec && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))) 812207680Szec && !priv->persistent) { 81370784Sjulian ng_rmnode_self(NG_HOOK_NODE(hook)); 81470784Sjulian } 81565310Sarchie return (0); 81665310Sarchie} 81765310Sarchie 81865310Sarchie/****************************************************************** 81965310Sarchie HASH TABLE FUNCTIONS 82065310Sarchie******************************************************************/ 82165310Sarchie 82265310Sarchie/* 82365310Sarchie * Hash algorithm 82465310Sarchie */ 82565310Sarchie#define HASH(addr,mask) ( (((const u_int16_t *)(addr))[0] \ 82665310Sarchie ^ ((const u_int16_t *)(addr))[1] \ 82765310Sarchie ^ ((const u_int16_t *)(addr))[2]) & (mask) ) 82865310Sarchie 82965310Sarchie/* 83065310Sarchie * Find a host entry in the table. 83165310Sarchie */ 83265310Sarchiestatic struct ng_bridge_host * 83365310Sarchieng_bridge_get(priv_p priv, const u_char *addr) 83465310Sarchie{ 83565310Sarchie const int bucket = HASH(addr, priv->hashMask); 83665310Sarchie struct ng_bridge_hent *hent; 83765310Sarchie 83865310Sarchie SLIST_FOREACH(hent, &priv->tab[bucket], next) { 83965310Sarchie if (ETHER_EQUAL(hent->host.addr, addr)) 84065310Sarchie return (&hent->host); 84165310Sarchie } 84265310Sarchie return (NULL); 84365310Sarchie} 84465310Sarchie 84565310Sarchie/* 84665310Sarchie * Add a new host entry to the table. This assumes the host doesn't 84765310Sarchie * already exist in the table. Returns 1 on success, 0 if there 84865310Sarchie * was a memory allocation failure. 84965310Sarchie */ 85065310Sarchiestatic int 85165310Sarchieng_bridge_put(priv_p priv, const u_char *addr, int linkNum) 85265310Sarchie{ 85365310Sarchie const int bucket = HASH(addr, priv->hashMask); 85465310Sarchie struct ng_bridge_hent *hent; 85565310Sarchie 85665310Sarchie#ifdef INVARIANTS 85765310Sarchie /* Assert that entry does not already exist in hashtable */ 85865310Sarchie SLIST_FOREACH(hent, &priv->tab[bucket], next) { 85965310Sarchie KASSERT(!ETHER_EQUAL(hent->host.addr, addr), 86087599Sobrien ("%s: entry %6D exists in table", __func__, addr, ":")); 86165310Sarchie } 86265310Sarchie#endif 86365310Sarchie 86465310Sarchie /* Allocate and initialize new hashtable entry */ 865184214Sdes hent = malloc(sizeof(*hent), M_NETGRAPH_BRIDGE, M_NOWAIT); 86665310Sarchie if (hent == NULL) 86765310Sarchie return (0); 86865310Sarchie bcopy(addr, hent->host.addr, ETHER_ADDR_LEN); 86965310Sarchie hent->host.linkNum = linkNum; 87065310Sarchie hent->host.staleness = 0; 87165310Sarchie hent->host.age = 0; 87265310Sarchie 87365310Sarchie /* Add new element to hash bucket */ 87465310Sarchie SLIST_INSERT_HEAD(&priv->tab[bucket], hent, next); 87565310Sarchie priv->numHosts++; 87665310Sarchie 87765310Sarchie /* Resize table if necessary */ 87865310Sarchie ng_bridge_rehash(priv); 87965310Sarchie return (1); 88065310Sarchie} 88165310Sarchie 88265310Sarchie/* 88365310Sarchie * Resize the hash table. We try to maintain the number of buckets 88465310Sarchie * such that the load factor is in the range 0.25 to 1.0. 88565310Sarchie * 88665310Sarchie * If we can't get the new memory then we silently fail. This is OK 88765310Sarchie * because things will still work and we'll try again soon anyway. 88865310Sarchie */ 88965310Sarchiestatic void 89065310Sarchieng_bridge_rehash(priv_p priv) 89165310Sarchie{ 89265310Sarchie struct ng_bridge_bucket *newTab; 89365310Sarchie int oldBucket, newBucket; 89465310Sarchie int newNumBuckets; 89565310Sarchie u_int newMask; 89665310Sarchie 89765310Sarchie /* Is table too full or too empty? */ 89865310Sarchie if (priv->numHosts > priv->numBuckets 89965310Sarchie && (priv->numBuckets << 1) <= MAX_BUCKETS) 90065310Sarchie newNumBuckets = priv->numBuckets << 1; 90165310Sarchie else if (priv->numHosts < (priv->numBuckets >> 2) 90265310Sarchie && (priv->numBuckets >> 2) >= MIN_BUCKETS) 90365310Sarchie newNumBuckets = priv->numBuckets >> 2; 90465310Sarchie else 90565310Sarchie return; 90665310Sarchie newMask = newNumBuckets - 1; 90765310Sarchie 90865310Sarchie /* Allocate and initialize new table */ 909184214Sdes newTab = malloc(newNumBuckets * sizeof(*newTab), 910184214Sdes M_NETGRAPH_BRIDGE, M_NOWAIT | M_ZERO); 91165310Sarchie if (newTab == NULL) 91265310Sarchie return; 91365310Sarchie 91465310Sarchie /* Move all entries from old table to new table */ 91565310Sarchie for (oldBucket = 0; oldBucket < priv->numBuckets; oldBucket++) { 91665310Sarchie struct ng_bridge_bucket *const oldList = &priv->tab[oldBucket]; 91765310Sarchie 91865310Sarchie while (!SLIST_EMPTY(oldList)) { 91965310Sarchie struct ng_bridge_hent *const hent 92065310Sarchie = SLIST_FIRST(oldList); 92165310Sarchie 92265310Sarchie SLIST_REMOVE_HEAD(oldList, next); 92365310Sarchie newBucket = HASH(hent->host.addr, newMask); 92465310Sarchie SLIST_INSERT_HEAD(&newTab[newBucket], hent, next); 92565310Sarchie } 92665310Sarchie } 92765310Sarchie 92865310Sarchie /* Replace old table with new one */ 92965310Sarchie if (priv->conf.debugLevel >= 3) { 93065310Sarchie log(LOG_INFO, "ng_bridge: %s: table size %d -> %d\n", 93165310Sarchie ng_bridge_nodename(priv->node), 93265310Sarchie priv->numBuckets, newNumBuckets); 93365310Sarchie } 934184205Sdes free(priv->tab, M_NETGRAPH_BRIDGE); 93565310Sarchie priv->numBuckets = newNumBuckets; 93665310Sarchie priv->hashMask = newMask; 93765310Sarchie priv->tab = newTab; 93865310Sarchie return; 93965310Sarchie} 94065310Sarchie 94165310Sarchie/****************************************************************** 94265310Sarchie MISC FUNCTIONS 94365310Sarchie******************************************************************/ 94465310Sarchie 94565310Sarchie/* 94665310Sarchie * Remove all hosts associated with a specific link from the hashtable. 94765310Sarchie * If linkNum == -1, then remove all hosts in the table. 94865310Sarchie */ 94965310Sarchiestatic void 95065310Sarchieng_bridge_remove_hosts(priv_p priv, int linkNum) 95165310Sarchie{ 95265310Sarchie int bucket; 95365310Sarchie 95465310Sarchie for (bucket = 0; bucket < priv->numBuckets; bucket++) { 95565310Sarchie struct ng_bridge_hent **hptr = &SLIST_FIRST(&priv->tab[bucket]); 95665310Sarchie 95765310Sarchie while (*hptr != NULL) { 95865310Sarchie struct ng_bridge_hent *const hent = *hptr; 95965310Sarchie 96065310Sarchie if (linkNum == -1 || hent->host.linkNum == linkNum) { 96165310Sarchie *hptr = SLIST_NEXT(hent, next); 962184205Sdes free(hent, M_NETGRAPH_BRIDGE); 96365310Sarchie priv->numHosts--; 96465310Sarchie } else 96565310Sarchie hptr = &SLIST_NEXT(hent, next); 96665310Sarchie } 96765310Sarchie } 96865310Sarchie} 96965310Sarchie 97065310Sarchie/* 97165310Sarchie * Handle our once-per-second timeout event. We do two things: 97265310Sarchie * we decrement link->loopCount for those links being muted due to 97365310Sarchie * a detected loopback condition, and we remove any hosts from 97465310Sarchie * the hashtable whom we haven't heard from in a long while. 97565310Sarchie */ 97665310Sarchiestatic void 977138834Sglebiusng_bridge_timeout(node_p node, hook_p hook, void *arg1, int arg2) 97865310Sarchie{ 97970784Sjulian const priv_p priv = NG_NODE_PRIVATE(node); 980138834Sglebius int bucket; 98165310Sarchie int counter = 0; 98265310Sarchie int linkNum; 98365310Sarchie 98465310Sarchie /* Update host time counters and remove stale entries */ 98565310Sarchie for (bucket = 0; bucket < priv->numBuckets; bucket++) { 98665310Sarchie struct ng_bridge_hent **hptr = &SLIST_FIRST(&priv->tab[bucket]); 98765310Sarchie 98865310Sarchie while (*hptr != NULL) { 98965310Sarchie struct ng_bridge_hent *const hent = *hptr; 99065310Sarchie 99165310Sarchie /* Make sure host's link really exists */ 99265310Sarchie KASSERT(priv->links[hent->host.linkNum] != NULL, 99365310Sarchie ("%s: host %6D on nonexistent link %d\n", 99487599Sobrien __func__, hent->host.addr, ":", 99565310Sarchie hent->host.linkNum)); 99665310Sarchie 99765310Sarchie /* Remove hosts we haven't heard from in a while */ 99865310Sarchie if (++hent->host.staleness >= priv->conf.maxStaleness) { 99965310Sarchie *hptr = SLIST_NEXT(hent, next); 1000184205Sdes free(hent, M_NETGRAPH_BRIDGE); 100165310Sarchie priv->numHosts--; 100265310Sarchie } else { 100365310Sarchie if (hent->host.age < 0xffff) 100465310Sarchie hent->host.age++; 100565310Sarchie hptr = &SLIST_NEXT(hent, next); 100665310Sarchie counter++; 100765310Sarchie } 100865310Sarchie } 100965310Sarchie } 101065310Sarchie KASSERT(priv->numHosts == counter, 101187599Sobrien ("%s: hosts: %d != %d", __func__, priv->numHosts, counter)); 101265310Sarchie 101365310Sarchie /* Decrease table size if necessary */ 101465310Sarchie ng_bridge_rehash(priv); 101565310Sarchie 101665310Sarchie /* Decrease loop counter on muted looped back links */ 101765310Sarchie for (counter = linkNum = 0; linkNum < NG_BRIDGE_MAX_LINKS; linkNum++) { 101865310Sarchie struct ng_bridge_link *const link = priv->links[linkNum]; 101965310Sarchie 102065310Sarchie if (link != NULL) { 102165310Sarchie if (link->loopCount != 0) { 102265310Sarchie link->loopCount--; 102365310Sarchie if (link->loopCount == 0 102465310Sarchie && priv->conf.debugLevel >= 2) { 102565310Sarchie log(LOG_INFO, "ng_bridge: %s:" 102665310Sarchie " restoring looped back link%d\n", 102765310Sarchie ng_bridge_nodename(node), linkNum); 102865310Sarchie } 102965310Sarchie } 103065310Sarchie counter++; 103165310Sarchie } 103265310Sarchie } 103365310Sarchie KASSERT(priv->numLinks == counter, 103487599Sobrien ("%s: links: %d != %d", __func__, priv->numLinks, counter)); 103565310Sarchie 1036138834Sglebius /* Register a new timeout, keeping the existing node reference */ 1037138834Sglebius ng_callout(&priv->timer, node, NULL, hz, ng_bridge_timeout, NULL, 0); 103865310Sarchie} 103965310Sarchie 104065310Sarchie/* 104165310Sarchie * Return node's "name", even if it doesn't have one. 104265310Sarchie */ 104365310Sarchiestatic const char * 104465310Sarchieng_bridge_nodename(node_p node) 104565310Sarchie{ 1046125028Sharti static char name[NG_NODESIZ]; 104765310Sarchie 104870784Sjulian if (NG_NODE_NAME(node) != NULL) 104970784Sjulian snprintf(name, sizeof(name), "%s", NG_NODE_NAME(node)); 105065310Sarchie else 105165310Sarchie snprintf(name, sizeof(name), "[%x]", ng_node2ID(node)); 105265310Sarchie return name; 105365310Sarchie} 105465310Sarchie 1055