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authorArchie Cobbs <archie@FreeBSD.org>2000-09-01 01:37:13 +0000
committerArchie Cobbs <archie@FreeBSD.org>2000-09-01 01:37:13 +0000
commited2dbd316aca41338dbad82208cd24cb96b33faa (patch)
tree910968afe6642bc434a029ca68ea2ab6251cc34b /sys
parent405177510cd034e7197559ea22afb5f16eca39f4 (diff)
downloadsrc-ed2dbd316aca41338dbad82208cd24cb96b33faa.tar.gz
src-ed2dbd316aca41338dbad82208cd24cb96b33faa.zip
New netgraph node type for Ethernet bridging.
No ipfw support yet.
Notes
Notes: svn path=/head/; revision=65310
Diffstat (limited to 'sys')
-rw-r--r--sys/conf/files1
-rw-r--r--sys/conf/options3
-rw-r--r--sys/modules/netgraph/Makefile2
-rw-r--r--sys/modules/netgraph/bridge/Makefile7
-rw-r--r--sys/netgraph/ng_bridge.c1014
-rw-r--r--sys/netgraph/ng_bridge.h162
6 files changed, 1187 insertions, 2 deletions
diff --git a/sys/conf/files b/sys/conf/files
index 33817e71d49b..e9c55f2dbee7 100644
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -710,6 +710,7 @@ netgraph/ng_async.c optional netgraph_async
netgraph/ng_base.c optional netgraph
netgraph/ng_bpf.c optional netgraph_bpf
net/bpf_filter.c optional netgraph_bpf
+netgraph/ng_bridge.c optional netgraph_bridge
netgraph/ng_cisco.c optional netgraph_cisco
netgraph/ng_echo.c optional netgraph_echo
netgraph/ng_ether.c optional netgraph_ether
diff --git a/sys/conf/options b/sys/conf/options
index d4ce246ca0c2..508707b0a1f6 100644
--- a/sys/conf/options
+++ b/sys/conf/options
@@ -269,10 +269,11 @@ XBONEHACK
# Netgraph(4). Use option NETGRAPH to enable the base netgraph code.
# Each netgraph node type can be either be compiled into the kernel
# or loaded dynamically. To get the former, include the corresponding
-# option below. Each type has its own man page, e.g. ng_async(8).
+# option below. Each type has its own man page, e.g. ng_async(4).
NETGRAPH
NETGRAPH_ASYNC opt_netgraph.h
NETGRAPH_BPF opt_netgraph.h
+NETGRAPH_BRIDGE opt_netgraph.h
NETGRAPH_CISCO opt_netgraph.h
NETGRAPH_ECHO opt_netgraph.h
NETGRAPH_ETHER opt_netgraph.h
diff --git a/sys/modules/netgraph/Makefile b/sys/modules/netgraph/Makefile
index 71eeceee3f71..714391e9176e 100644
--- a/sys/modules/netgraph/Makefile
+++ b/sys/modules/netgraph/Makefile
@@ -1,7 +1,7 @@
# $Whistle: Makefile,v 1.5 1999/01/24 06:48:37 archie Exp $
# $FreeBSD$
-SUBDIR= async bpf cisco echo ether frame_relay hole iface ksocket lmi \
+SUBDIR= async bpf bridge cisco echo ether frame_relay hole iface ksocket lmi \
netgraph ppp pppoe pptpgre rfc1490 socket tee tty UI vjc
.if !defined(NOCRYPT) && exists(${.CURDIR}/../../crypto/rc4/rc4.c)
diff --git a/sys/modules/netgraph/bridge/Makefile b/sys/modules/netgraph/bridge/Makefile
new file mode 100644
index 000000000000..5afd54163f5c
--- /dev/null
+++ b/sys/modules/netgraph/bridge/Makefile
@@ -0,0 +1,7 @@
+# $FreeBSD$
+
+KMOD= ng_bridge
+SRCS= ng_bridge.c
+NOMAN=
+
+.include <bsd.kmod.mk>
diff --git a/sys/netgraph/ng_bridge.c b/sys/netgraph/ng_bridge.c
new file mode 100644
index 000000000000..81ffa6894382
--- /dev/null
+++ b/sys/netgraph/ng_bridge.c
@@ -0,0 +1,1014 @@
+
+/*
+ * ng_bridge.c
+ *
+ * Copyright (c) 2000 Whistle Communications, Inc.
+ * All rights reserved.
+ *
+ * Subject to the following obligations and disclaimer of warranty, use and
+ * redistribution of this software, in source or object code forms, with or
+ * without modifications are expressly permitted by Whistle Communications;
+ * provided, however, that:
+ * 1. Any and all reproductions of the source or object code must include the
+ * copyright notice above and the following disclaimer of warranties; and
+ * 2. No rights are granted, in any manner or form, to use Whistle
+ * Communications, Inc. trademarks, including the mark "WHISTLE
+ * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
+ * such appears in the above copyright notice or in the software.
+ *
+ * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
+ * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
+ * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
+ * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
+ * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
+ * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
+ * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
+ * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
+ * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
+ * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
+ * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * Author: Archie Cobbs <archie@freebsd.org>
+ *
+ * $FreeBSD$
+ */
+
+/*
+ * ng_bridge(4) netgraph node type
+ *
+ * The node performs standard intelligent Ethernet bridging over
+ * each of its connected hooks, or links. A simple loop detection
+ * algorithm is included which disables a link for priv->conf.loopTimeout
+ * seconds when a host is seen to have jumped from one link to
+ * another within priv->conf.minStableAge seconds.
+ *
+ * We keep a hashtable that maps Ethernet addresses to host info,
+ * which is contained in struct ng_bridge_host's. These structures
+ * tell us on which link the host may be found. A host's entry will
+ * expire after priv->conf.maxStaleness seconds.
+ *
+ * This node is optimzed for stable networks, where machines jump
+ * from one port to the other only rarely.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/errno.h>
+#include <sys/syslog.h>
+#include <sys/socket.h>
+#include <sys/ctype.h>
+
+#include <net/if.h>
+#include <net/ethernet.h>
+
+#include <netinet/in.h>
+#include <netinet/ip_fw.h>
+
+#include <netgraph/ng_message.h>
+#include <netgraph/netgraph.h>
+#include <netgraph/ng_parse.h>
+#include <netgraph/ng_bridge.h>
+#include <netgraph/ng_ether.h>
+
+/* Per-link private data */
+struct ng_bridge_link {
+ hook_p hook; /* netgraph hook */
+ u_int16_t loopCount; /* loop ignore timer */
+ struct ng_bridge_link_stats stats; /* link stats */
+};
+
+/* Per-node private data */
+struct ng_bridge_private {
+ struct ng_bridge_bucket *tab; /* hash table bucket array */
+ struct ng_bridge_link *links[NG_BRIDGE_MAX_LINKS];
+ struct ng_bridge_config conf; /* node configuration */
+ node_p node; /* netgraph node */
+ u_int numHosts; /* num entries in table */
+ u_int numBuckets; /* num buckets in table */
+ u_int hashMask; /* numBuckets - 1 */
+ int numLinks; /* num connected links */
+ struct callout timer; /* one second periodic timer */
+};
+typedef struct ng_bridge_private *priv_p;
+
+/* Information about a host, stored in a hash table entry */
+struct ng_bridge_hent {
+ struct ng_bridge_host host; /* actual host info */
+ SLIST_ENTRY(ng_bridge_hent) next; /* next entry in bucket */
+};
+
+/* Hash table bucket declaration */
+SLIST_HEAD(ng_bridge_bucket, ng_bridge_hent);
+
+/* Netgraph node methods */
+static ng_constructor_t ng_bridge_constructor;
+static ng_rcvmsg_t ng_bridge_rcvmsg;
+static ng_shutdown_t ng_bridge_rmnode;
+static ng_newhook_t ng_bridge_newhook;
+static ng_rcvdata_t ng_bridge_rcvdata;
+static ng_disconnect_t ng_bridge_disconnect;
+
+/* Other internal functions */
+static struct ng_bridge_host *ng_bridge_get(priv_p priv, const u_char *addr);
+static int ng_bridge_put(priv_p priv, const u_char *addr, int linkNum);
+static void ng_bridge_rehash(priv_p priv);
+static void ng_bridge_remove_hosts(priv_p priv, int linkNum);
+static void ng_bridge_timeout(void *arg);
+static const char *ng_bridge_nodename(node_p node);
+
+/* Ethernet broadcast */
+static const u_char ng_bridge_bcast_addr[ETHER_ADDR_LEN] =
+ { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
+
+/* Store each hook's link number in the private field */
+#define LINK_NUM(hook) (*(u_int16_t *)(&(hook)->private))
+
+/* Compare Ethernet addresses using 32 and 16 bit words instead of bytewise */
+#define ETHER_EQUAL(a,b) (((const u_int32_t *)(a))[0] \
+ == ((const u_int32_t *)(b))[0] \
+ && ((const u_int16_t *)(a))[2] \
+ == ((const u_int16_t *)(b))[2])
+
+/* Minimum and maximum number of hash buckets. Must be a power of two. */
+#define MIN_BUCKETS (1 << 5) /* 32 */
+#define MAX_BUCKETS (1 << 14) /* 16384 */
+
+/* Configuration default values */
+#define DEFAULT_LOOP_TIMEOUT 60
+#define DEFAULT_MAX_STALENESS (15 * 60) /* same as ARP timeout */
+#define DEFAULT_MIN_STABLE_AGE 1
+
+/******************************************************************
+ NETGRAPH PARSE TYPES
+******************************************************************/
+
+/*
+ * How to determine the length of the table returned by NGM_BRIDGE_GET_TABLE
+ */
+static int
+ng_bridge_getTableLength(const struct ng_parse_type *type,
+ const u_char *start, const u_char *buf)
+{
+ const struct ng_bridge_host_ary *const hary
+ = (const struct ng_bridge_host_ary *)(buf - sizeof(u_int32_t));
+
+ return hary->numHosts;
+}
+
+/* Parse type for struct ng_bridge_host_ary */
+static const struct ng_parse_struct_info ng_bridge_host_type_info
+ = NG_BRIDGE_HOST_TYPE_INFO(&ng_ether_enaddr_type);
+static const struct ng_parse_type ng_bridge_host_type = {
+ &ng_parse_struct_type,
+ &ng_bridge_host_type_info
+};
+static const struct ng_parse_array_info ng_bridge_hary_type_info = {
+ &ng_bridge_host_type,
+ ng_bridge_getTableLength
+};
+static const struct ng_parse_type ng_bridge_hary_type = {
+ &ng_parse_array_type,
+ &ng_bridge_hary_type_info
+};
+static const struct ng_parse_struct_info ng_bridge_host_ary_type_info
+ = NG_BRIDGE_HOST_ARY_TYPE_INFO(&ng_bridge_hary_type);
+static const struct ng_parse_type ng_bridge_host_ary_type = {
+ &ng_parse_struct_type,
+ &ng_bridge_host_ary_type_info
+};
+
+/* Parse type for struct ng_bridge_config */
+static const struct ng_parse_fixedarray_info ng_bridge_ipfwary_type_info = {
+ &ng_parse_uint8_type,
+ NG_BRIDGE_MAX_LINKS
+};
+static const struct ng_parse_type ng_bridge_ipfwary_type = {
+ &ng_parse_fixedarray_type,
+ &ng_bridge_ipfwary_type_info
+};
+static const struct ng_parse_struct_info ng_bridge_config_type_info
+ = NG_BRIDGE_CONFIG_TYPE_INFO(&ng_bridge_ipfwary_type);
+static const struct ng_parse_type ng_bridge_config_type = {
+ &ng_parse_struct_type,
+ &ng_bridge_config_type_info
+};
+
+/* Parse type for struct ng_bridge_link_stat */
+static const struct ng_parse_struct_info
+ ng_bridge_stats_type_info = NG_BRIDGE_STATS_TYPE_INFO;
+static const struct ng_parse_type ng_bridge_stats_type = {
+ &ng_parse_struct_type,
+ &ng_bridge_stats_type_info
+};
+
+/* List of commands and how to convert arguments to/from ASCII */
+static const struct ng_cmdlist ng_bridge_cmdlist[] = {
+ {
+ NGM_BRIDGE_COOKIE,
+ NGM_BRIDGE_SET_CONFIG,
+ "setconfig",
+ &ng_bridge_config_type,
+ NULL
+ },
+ {
+ NGM_BRIDGE_COOKIE,
+ NGM_BRIDGE_GET_CONFIG,
+ "getconfig",
+ NULL,
+ &ng_bridge_config_type
+ },
+ {
+ NGM_BRIDGE_COOKIE,
+ NGM_BRIDGE_RESET,
+ "reset",
+ NULL,
+ NULL
+ },
+ {
+ NGM_BRIDGE_COOKIE,
+ NGM_BRIDGE_GET_STATS,
+ "getstats",
+ &ng_parse_uint32_type,
+ &ng_bridge_stats_type
+ },
+ {
+ NGM_BRIDGE_COOKIE,
+ NGM_BRIDGE_CLR_STATS,
+ "clrstats",
+ &ng_parse_uint32_type,
+ NULL
+ },
+ {
+ NGM_BRIDGE_COOKIE,
+ NGM_BRIDGE_GETCLR_STATS,
+ "getclrstats",
+ &ng_parse_uint32_type,
+ &ng_bridge_stats_type
+ },
+ {
+ NGM_BRIDGE_COOKIE,
+ NGM_BRIDGE_GET_TABLE,
+ "gettable",
+ NULL,
+ &ng_bridge_host_ary_type
+ },
+ { 0 }
+};
+
+/* Node type descriptor */
+static struct ng_type ng_bridge_typestruct = {
+ NG_VERSION,
+ NG_BRIDGE_NODE_TYPE,
+ NULL,
+ ng_bridge_constructor,
+ ng_bridge_rcvmsg,
+ ng_bridge_rmnode,
+ ng_bridge_newhook,
+ NULL,
+ NULL,
+ ng_bridge_rcvdata,
+ ng_bridge_rcvdata,
+ ng_bridge_disconnect,
+ ng_bridge_cmdlist,
+};
+NETGRAPH_INIT(ether, &ng_bridge_typestruct);
+
+/* Depend on ng_ether so we can use the Ethernet parse type */
+MODULE_DEPEND(ng_bridge, ng_ether, 1, 1, 1);
+
+/******************************************************************
+ NETGRAPH NODE METHODS
+******************************************************************/
+
+/*
+ * Node constructor
+ */
+static int
+ng_bridge_constructor(node_p *nodep)
+{
+ priv_p priv;
+ int error;
+
+ /* Allocate and initialize private info */
+ MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT);
+ if (priv == NULL)
+ return (ENOMEM);
+ bzero(priv, sizeof(*priv));
+ callout_init(&priv->timer);
+
+ /* Allocate and initialize hash table, etc. */
+ MALLOC(priv->tab, struct ng_bridge_bucket *,
+ MIN_BUCKETS * sizeof(*priv->tab), M_NETGRAPH, M_NOWAIT);
+ if (priv->tab == NULL) {
+ FREE(priv, M_NETGRAPH);
+ return (ENOMEM);
+ }
+ bzero(priv->tab, MIN_BUCKETS * sizeof(*priv->tab)); /* init SLIST's */
+ priv->numBuckets = MIN_BUCKETS;
+ priv->hashMask = MIN_BUCKETS - 1;
+ priv->conf.debugLevel = 1;
+ priv->conf.loopTimeout = DEFAULT_LOOP_TIMEOUT;
+ priv->conf.maxStaleness = DEFAULT_MAX_STALENESS;
+ priv->conf.minStableAge = DEFAULT_MIN_STABLE_AGE;
+
+ /* Call superclass constructor */
+ if ((error = ng_make_node_common(&ng_bridge_typestruct, nodep))) {
+ FREE(priv, M_NETGRAPH);
+ return (error);
+ }
+ (*nodep)->private = priv;
+ priv->node = *nodep;
+
+ /* Start timer by faking a timeout event */
+ (*nodep)->refs++;
+ ng_bridge_timeout(*nodep);
+ return (0);
+}
+
+/*
+ * Method for attaching a new hook
+ */
+static int
+ng_bridge_newhook(node_p node, hook_p hook, const char *name)
+{
+ const priv_p priv = node->private;
+
+ /* Check for a link hook */
+ if (strncmp(name, NG_BRIDGE_HOOK_LINK_PREFIX,
+ strlen(NG_BRIDGE_HOOK_LINK_PREFIX)) == 0) {
+ const char *cp;
+ char *eptr;
+ u_long linkNum;
+
+ cp = name + strlen(NG_BRIDGE_HOOK_LINK_PREFIX);
+ if (!isdigit(*cp) || (cp[0] == '0' && cp[1] != '\0'))
+ return (EINVAL);
+ linkNum = strtoul(cp, &eptr, 10);
+ if (*eptr != '\0' || linkNum >= NG_BRIDGE_MAX_LINKS)
+ return (EINVAL);
+ if (priv->links[linkNum] != NULL)
+ return (EISCONN);
+ MALLOC(priv->links[linkNum], struct ng_bridge_link *,
+ sizeof(*priv->links[linkNum]), M_NETGRAPH, M_NOWAIT);
+ if (priv->links[linkNum] == NULL)
+ return (ENOMEM);
+ bzero(priv->links[linkNum], sizeof(*priv->links[linkNum]));
+ priv->links[linkNum]->hook = hook;
+ LINK_NUM(hook) = linkNum;
+ priv->numLinks++;
+ return (0);
+ }
+
+ /* Unknown hook name */
+ return (EINVAL);
+}
+
+/*
+ * Receive a control message
+ */
+static int
+ng_bridge_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr,
+ struct ng_mesg **rptr, hook_p lasthook)
+{
+ const priv_p priv = node->private;
+ struct ng_mesg *resp = NULL;
+ int error = 0;
+
+ switch (msg->header.typecookie) {
+ case NGM_BRIDGE_COOKIE:
+ switch (msg->header.cmd) {
+ case NGM_BRIDGE_GET_CONFIG:
+ {
+ struct ng_bridge_config *conf;
+
+ NG_MKRESPONSE(resp, msg,
+ sizeof(struct ng_bridge_config), M_NOWAIT);
+ if (resp == NULL) {
+ error = ENOMEM;
+ break;
+ }
+ conf = (struct ng_bridge_config *)resp->data;
+ *conf = priv->conf; /* no sanity checking needed */
+ break;
+ }
+ case NGM_BRIDGE_SET_CONFIG:
+ {
+ struct ng_bridge_config *conf;
+ int i;
+
+ if (msg->header.arglen
+ != sizeof(struct ng_bridge_config)) {
+ error = EINVAL;
+ break;
+ }
+ conf = (struct ng_bridge_config *)msg->data;
+ priv->conf = *conf;
+ for (i = 0; i < NG_BRIDGE_MAX_LINKS; i++)
+ priv->conf.ipfw[i] = !!priv->conf.ipfw[i];
+ break;
+ }
+ case NGM_BRIDGE_RESET:
+ {
+ int i;
+
+ /* Flush all entries in the hash table */
+ ng_bridge_remove_hosts(priv, -1);
+
+ /* Reset all loop detection counters and stats */
+ for (i = 0; i < NG_BRIDGE_MAX_LINKS; i++) {
+ if (priv->links[i] == NULL)
+ continue;
+ priv->links[i]->loopCount = 0;
+ bzero(&priv->links[i]->stats,
+ sizeof(priv->links[i]->stats));
+ }
+ break;
+ }
+ case NGM_BRIDGE_GET_STATS:
+ case NGM_BRIDGE_CLR_STATS:
+ case NGM_BRIDGE_GETCLR_STATS:
+ {
+ struct ng_bridge_link *link;
+ int linkNum;
+
+ /* Get link number */
+ if (msg->header.arglen != sizeof(u_int32_t)) {
+ error = EINVAL;
+ break;
+ }
+ linkNum = *((u_int32_t *)msg->data);
+ if (linkNum < 0 || linkNum >= NG_BRIDGE_MAX_LINKS) {
+ error = EINVAL;
+ break;
+ }
+ if ((link = priv->links[linkNum]) == NULL) {
+ error = ENOTCONN;
+ break;
+ }
+
+ /* Get/clear stats */
+ if (msg->header.cmd != NGM_BRIDGE_CLR_STATS) {
+ NG_MKRESPONSE(resp, msg,
+ sizeof(link->stats), M_NOWAIT);
+ if (resp == NULL) {
+ error = ENOMEM;
+ break;
+ }
+ bcopy(&link->stats,
+ resp->data, sizeof(link->stats));
+ }
+ if (msg->header.cmd != NGM_BRIDGE_GET_STATS)
+ bzero(&link->stats, sizeof(link->stats));
+ break;
+ }
+ case NGM_BRIDGE_GET_TABLE:
+ {
+ struct ng_bridge_host_ary *ary;
+ struct ng_bridge_hent *hent;
+ int i = 0, bucket;
+
+ NG_MKRESPONSE(resp, msg, sizeof(*ary)
+ + (priv->numHosts * sizeof(*ary->hosts)), M_NOWAIT);
+ if (resp == NULL) {
+ error = ENOMEM;
+ break;
+ }
+ ary = (struct ng_bridge_host_ary *)resp->data;
+ ary->numHosts = priv->numHosts;
+ for (bucket = 0; bucket < priv->numBuckets; bucket++) {
+ SLIST_FOREACH(hent, &priv->tab[bucket], next)
+ ary->hosts[i++] = hent->host;
+ }
+ break;
+ }
+ default:
+ error = EINVAL;
+ break;
+ }
+ break;
+ default:
+ error = EINVAL;
+ break;
+ }
+
+ /* Done */
+ if (rptr)
+ *rptr = resp;
+ else if (resp != NULL)
+ FREE(resp, M_NETGRAPH);
+ FREE(msg, M_NETGRAPH);
+ return (error);
+}
+
+/*
+ * Receive data on a hook
+ */
+static int
+ng_bridge_rcvdata(hook_p hook, struct mbuf *m, meta_p meta,
+ struct mbuf **ret_m, meta_p *ret_meta)
+{
+ const node_p node = hook->node;
+ const priv_p priv = node->private;
+ struct ng_bridge_host *host;
+ struct ng_bridge_link *link;
+ struct ether_header *eh;
+ int error = 0, linkNum;
+ int i, manycast;
+
+ /* Get link number */
+ linkNum = LINK_NUM(hook);
+ KASSERT(linkNum >= 0 && linkNum < NG_BRIDGE_MAX_LINKS,
+ ("%s: linkNum=%u", __FUNCTION__, linkNum));
+ link = priv->links[linkNum];
+ KASSERT(link != NULL, ("%s: link%d null", __FUNCTION__, linkNum));
+
+ /* Sanity check packet and pull up header */
+ if (m->m_pkthdr.len < ETHER_HDR_LEN) {
+ link->stats.recvRunts++;
+ NG_FREE_DATA(m, meta);
+ return (EINVAL);
+ }
+ if (m->m_len < ETHER_HDR_LEN && !(m = m_pullup(m, ETHER_HDR_LEN))) {
+ link->stats.memoryFailures++;
+ NG_FREE_META(meta);
+ return (ENOBUFS);
+ }
+ eh = mtod(m, struct ether_header *);
+ if ((eh->ether_shost[0] & 1) != 0) {
+ link->stats.recvInvalid++;
+ NG_FREE_DATA(m, meta);
+ return (EINVAL);
+ }
+
+ /* Is link disabled due to a loopback condition? */
+ if (link->loopCount != 0) {
+ link->stats.loopDrops++;
+ NG_FREE_DATA(m, meta);
+ return (ELOOP); /* XXX is this an appropriate error? */
+ }
+
+ /* Update stats */
+ link->stats.recvPackets++;
+ link->stats.recvOctets += m->m_pkthdr.len;
+ if ((manycast = (eh->ether_dhost[0] & 1)) != 0) {
+ if (ETHER_EQUAL(eh->ether_dhost, ng_bridge_bcast_addr)) {
+ link->stats.recvBroadcasts++;
+ manycast = 2;
+ } else
+ link->stats.recvMulticasts++;
+ }
+
+ /* Look up packet's source Ethernet address in hashtable */
+ if ((host = ng_bridge_get(priv, eh->ether_shost)) != NULL) {
+
+ /* Update time since last heard from this host */
+ host->staleness = 0;
+
+ /* Did host jump to a different link? */
+ if (host->linkNum != linkNum) {
+
+ /*
+ * If the host's old link was recently established
+ * on the old link and it's already jumped to a new
+ * link, declare a loopback condition.
+ */
+ if (host->age < priv->conf.minStableAge) {
+
+ /* Log the problem */
+ if (priv->conf.debugLevel >= 2) {
+ struct ifnet *ifp = m->m_pkthdr.rcvif;
+ char suffix[32];
+
+ if (ifp != NULL)
+ snprintf(suffix, sizeof(suffix),
+ " (%s%d)", ifp->if_name,
+ ifp->if_unit);
+ else
+ *suffix = '\0';
+ log(LOG_WARNING, "ng_bridge: %s:"
+ " loopback detected on %s%s\n",
+ ng_bridge_nodename(node),
+ hook->name, suffix);
+ }
+
+ /* Mark link as linka non grata */
+ link->loopCount = priv->conf.loopTimeout;
+ link->stats.loopDetects++;
+
+ /* Forget all hosts on this link */
+ ng_bridge_remove_hosts(priv, linkNum);
+
+ /* Drop packet */
+ link->stats.loopDrops++;
+ NG_FREE_DATA(m, meta);
+ return (ELOOP); /* XXX appropriate? */
+ }
+
+ /* Move host over to new link */
+ host->linkNum = linkNum;
+ host->age = 0;
+ }
+ } else {
+ if (!ng_bridge_put(priv, eh->ether_shost, linkNum)) {
+ link->stats.memoryFailures++;
+ NG_FREE_DATA(m, meta);
+ return (ENOMEM);
+ }
+ }
+
+ /* Run packet through ipfw processing, if enabled */
+ if (priv->conf.ipfw[linkNum] && fw_enable && ip_fw_chk_ptr != NULL) {
+ /* XXX not implemented yet */
+ }
+
+ /*
+ * If unicast and destination host known, deliver to host's link,
+ * unless it is the same link as the packet came in on.
+ */
+ if (!manycast) {
+
+ /* Determine packet destination link */
+ if ((host = ng_bridge_get(priv, eh->ether_dhost)) != NULL) {
+ struct ng_bridge_link *const destLink
+ = priv->links[host->linkNum];
+
+ /* If destination same as incoming link, do nothing */
+ KASSERT(destLink != NULL,
+ ("%s: link%d null", __FUNCTION__, host->linkNum));
+ if (destLink == link) {
+ NG_FREE_DATA(m, meta);
+ return (0);
+ }
+
+ /* Deliver packet out the destination link */
+ destLink->stats.xmitPackets++;
+ destLink->stats.xmitOctets += m->m_pkthdr.len;
+ NG_SEND_DATA(error, destLink->hook, m, meta);
+ return (error);
+ }
+
+ /* Destination host is not known */
+ link->stats.recvUnknown++;
+ }
+
+ /* Distribute unknown, multicast, broadcast pkts to all other links */
+ for (linkNum = i = 0; i < priv->numLinks - 1; linkNum++) {
+ struct ng_bridge_link *const destLink = priv->links[linkNum];
+ meta_p meta2 = NULL;
+ struct mbuf *m2;
+
+ /* Skip incoming link and disconnected links */
+ if (destLink == NULL || destLink == link)
+ continue;
+
+ /* Copy mbuf and meta info */
+ if (++i == priv->numLinks - 1) { /* last link */
+ m2 = m;
+ meta2 = meta;
+ } else {
+ m2 = m_copypacket(m, M_NOWAIT); /* XXX m_dup()? */
+ if (m2 == NULL) {
+ link->stats.memoryFailures++;
+ NG_FREE_DATA(m, meta);
+ return (ENOBUFS);
+ }
+ if (meta != NULL
+ && (meta2 = ng_copy_meta(meta)) == NULL) {
+ link->stats.memoryFailures++;
+ m_freem(m2);
+ NG_FREE_DATA(m, meta);
+ return (ENOMEM);
+ }
+ }
+
+ /* Update stats */
+ destLink->stats.xmitPackets++;
+ destLink->stats.xmitOctets += m->m_pkthdr.len;
+ switch (manycast) {
+ case 0: /* unicast */
+ break;
+ case 1: /* multicast */
+ destLink->stats.xmitMulticasts++;
+ break;
+ case 2: /* broadcast */
+ destLink->stats.xmitBroadcasts++;
+ break;
+ }
+
+ /* Send packet */
+ NG_SEND_DATA(error, destLink->hook, m2, meta2);
+ }
+ return (error);
+}
+
+/*
+ * Shutdown node
+ */
+static int
+ng_bridge_rmnode(node_p node)
+{
+ const priv_p priv = node->private;
+
+ ng_unname(node);
+ ng_cutlinks(node); /* frees all link and host info */
+ KASSERT(priv->numLinks == 0 && priv->numHosts == 0,
+ ("%s: numLinks=%d numHosts=%d",
+ __FUNCTION__, priv->numLinks, priv->numHosts));
+ FREE(priv->tab, M_NETGRAPH);
+ FREE(priv, M_NETGRAPH);
+ node->private = NULL;
+ ng_unref(node);
+ return (0);
+}
+
+/*
+ * Hook disconnection.
+ */
+static int
+ng_bridge_disconnect(hook_p hook)
+{
+ const priv_p priv = hook->node->private;
+ int linkNum;
+
+ /* Get link number */
+ linkNum = LINK_NUM(hook);
+ KASSERT(linkNum >= 0 && linkNum < NG_BRIDGE_MAX_LINKS,
+ ("%s: linkNum=%u", __FUNCTION__, linkNum));
+
+ /* Remove all hosts associated with this link */
+ ng_bridge_remove_hosts(priv, linkNum);
+
+ /* Free associated link information */
+ KASSERT(priv->links[linkNum] != NULL, ("%s: no link", __FUNCTION__));
+ FREE(priv->links[linkNum], M_NETGRAPH);
+ priv->links[linkNum] = NULL;
+ priv->numLinks--;
+
+ /* If no more hooks, go away */
+ if (hook->node->numhooks == 0)
+ ng_rmnode(hook->node);
+ return (0);
+}
+
+/******************************************************************
+ HASH TABLE FUNCTIONS
+******************************************************************/
+
+/*
+ * Hash algorithm
+ *
+ * Only hashing bytes 3-6 of the Ethernet address is sufficient and fast.
+ */
+#define HASH(addr,mask) ( (((const u_int16_t *)(addr))[0] \
+ ^ ((const u_int16_t *)(addr))[1] \
+ ^ ((const u_int16_t *)(addr))[2]) & (mask) )
+
+/*
+ * Find a host entry in the table.
+ */
+static struct ng_bridge_host *
+ng_bridge_get(priv_p priv, const u_char *addr)
+{
+ const int bucket = HASH(addr, priv->hashMask);
+ struct ng_bridge_hent *hent;
+
+ SLIST_FOREACH(hent, &priv->tab[bucket], next) {
+ if (ETHER_EQUAL(hent->host.addr, addr))
+ return (&hent->host);
+ }
+ return (NULL);
+}
+
+/*
+ * Add a new host entry to the table. This assumes the host doesn't
+ * already exist in the table. Returns 1 on success, 0 if there
+ * was a memory allocation failure.
+ */
+static int
+ng_bridge_put(priv_p priv, const u_char *addr, int linkNum)
+{
+ const int bucket = HASH(addr, priv->hashMask);
+ struct ng_bridge_hent *hent;
+
+#ifdef INVARIANTS
+ /* Assert that entry does not already exist in hashtable */
+ SLIST_FOREACH(hent, &priv->tab[bucket], next) {
+ KASSERT(!ETHER_EQUAL(hent->host.addr, addr),
+ ("%s: entry %6D exists in table", __FUNCTION__, addr, ":"));
+ }
+#endif
+
+ /* Allocate and initialize new hashtable entry */
+ MALLOC(hent, struct ng_bridge_hent *,
+ sizeof(*hent), M_NETGRAPH, M_NOWAIT);
+ if (hent == NULL)
+ return (0);
+ bcopy(addr, hent->host.addr, ETHER_ADDR_LEN);
+ hent->host.linkNum = linkNum;
+ hent->host.staleness = 0;
+ hent->host.age = 0;
+
+ /* Add new element to hash bucket */
+ SLIST_INSERT_HEAD(&priv->tab[bucket], hent, next);
+ priv->numHosts++;
+
+ /* Resize table if necessary */
+ ng_bridge_rehash(priv);
+ return (1);
+}
+
+/*
+ * Resize the hash table. We try to maintain the number of buckets
+ * such that the load factor is in the range 0.25 to 1.0.
+ *
+ * If we can't get the new memory then we silently fail. This is OK
+ * because things will still work and we'll try again soon anyway.
+ */
+static void
+ng_bridge_rehash(priv_p priv)
+{
+ struct ng_bridge_bucket *newTab;
+ int oldBucket, newBucket;
+ int newNumBuckets;
+ u_int newMask;
+
+ /* Is table too full or too empty? */
+ if (priv->numHosts > priv->numBuckets
+ && (priv->numBuckets << 1) <= MAX_BUCKETS)
+ newNumBuckets = priv->numBuckets << 1;
+ else if (priv->numHosts < (priv->numBuckets >> 2)
+ && (priv->numBuckets >> 2) >= MIN_BUCKETS)
+ newNumBuckets = priv->numBuckets >> 2;
+ else
+ return;
+ newMask = newNumBuckets - 1;
+
+ /* Allocate and initialize new table */
+ MALLOC(newTab, struct ng_bridge_bucket *,
+ newNumBuckets * sizeof(*newTab), M_NETGRAPH, M_NOWAIT);
+ if (newTab == NULL)
+ return;
+ bzero(newTab, newNumBuckets * sizeof(*newTab));
+
+ /* Move all entries from old table to new table */
+ for (oldBucket = 0; oldBucket < priv->numBuckets; oldBucket++) {
+ struct ng_bridge_bucket *const oldList = &priv->tab[oldBucket];
+
+ while (!SLIST_EMPTY(oldList)) {
+ struct ng_bridge_hent *const hent
+ = SLIST_FIRST(oldList);
+
+ SLIST_REMOVE_HEAD(oldList, next);
+ newBucket = HASH(hent->host.addr, newMask);
+ SLIST_INSERT_HEAD(&newTab[newBucket], hent, next);
+ }
+ }
+
+ /* Replace old table with new one */
+ if (priv->conf.debugLevel >= 3) {
+ log(LOG_INFO, "ng_bridge: %s: table size %d -> %d\n",
+ ng_bridge_nodename(priv->node),
+ priv->numBuckets, newNumBuckets);
+ }
+ FREE(priv->tab, M_NETGRAPH);
+ priv->numBuckets = newNumBuckets;
+ priv->hashMask = newMask;
+ priv->tab = newTab;
+ return;
+}
+
+/******************************************************************
+ MISC FUNCTIONS
+******************************************************************/
+
+/*
+ * Remove all hosts associated with a specific link from the hashtable.
+ * If linkNum == -1, then remove all hosts in the table.
+ */
+static void
+ng_bridge_remove_hosts(priv_p priv, int linkNum)
+{
+ int bucket;
+
+ for (bucket = 0; bucket < priv->numBuckets; bucket++) {
+ struct ng_bridge_hent **hptr = &SLIST_FIRST(&priv->tab[bucket]);
+
+ while (*hptr != NULL) {
+ struct ng_bridge_hent *const hent = *hptr;
+
+ if (linkNum == -1 || hent->host.linkNum == linkNum) {
+ *hptr = SLIST_NEXT(hent, next);
+ FREE(hent, M_NETGRAPH);
+ priv->numHosts--;
+ } else
+ hptr = &SLIST_NEXT(hent, next);
+ }
+ }
+}
+
+/*
+ * Handle our once-per-second timeout event. We do two things:
+ * we decrement link->loopCount for those links being muted due to
+ * a detected loopback condition, and we remove any hosts from
+ * the hashtable whom we haven't heard from in a long while.
+ */
+static void
+ng_bridge_timeout(void *arg)
+{
+ const node_p node = arg;
+ const priv_p priv = node->private;
+ int s, bucket;
+ int counter = 0;
+ int linkNum;
+
+ /* Avoid race condition with ng_bridge_shutdown() */
+ s = splnet();
+ if ((node->flags & NG_INVALID) != 0 || priv == NULL) {
+ ng_unref(node);
+ splx(s);
+ return;
+ }
+
+ /* Register a new timeout, keeping the existing node reference */
+ callout_reset(&priv->timer, hz, ng_bridge_timeout, node);
+
+ /* Update host time counters and remove stale entries */
+ for (bucket = 0; bucket < priv->numBuckets; bucket++) {
+ struct ng_bridge_hent **hptr = &SLIST_FIRST(&priv->tab[bucket]);
+
+ while (*hptr != NULL) {
+ struct ng_bridge_hent *const hent = *hptr;
+
+ /* Make sure host's link really exists */
+ KASSERT(priv->links[hent->host.linkNum] != NULL,
+ ("%s: host %6D on nonexistent link %d\n",
+ __FUNCTION__, hent->host.addr, ":",
+ hent->host.linkNum));
+
+ /* Remove hosts we haven't heard from in a while */
+ if (++hent->host.staleness >= priv->conf.maxStaleness) {
+ *hptr = SLIST_NEXT(hent, next);
+ FREE(hent, M_NETGRAPH);
+ priv->numHosts--;
+ } else {
+ if (hent->host.age < 0xffff)
+ hent->host.age++;
+ hptr = &SLIST_NEXT(hent, next);
+ counter++;
+ }
+ }
+ }
+ KASSERT(priv->numHosts == counter,
+ ("%s: hosts: %d != %d", __FUNCTION__, priv->numHosts, counter));
+
+ /* Decrease table size if necessary */
+ ng_bridge_rehash(priv);
+
+ /* Decrease loop counter on muted looped back links */
+ for (counter = linkNum = 0; linkNum < NG_BRIDGE_MAX_LINKS; linkNum++) {
+ struct ng_bridge_link *const link = priv->links[linkNum];
+
+ if (link != NULL) {
+ if (link->loopCount != 0) {
+ link->loopCount--;
+ if (link->loopCount == 0
+ && priv->conf.debugLevel >= 2) {
+ log(LOG_INFO, "ng_bridge: %s:"
+ " restoring looped back link%d\n",
+ ng_bridge_nodename(node), linkNum);
+ }
+ }
+ counter++;
+ }
+ }
+ KASSERT(priv->numLinks == counter,
+ ("%s: links: %d != %d", __FUNCTION__, priv->numLinks, counter));
+
+ /* Done */
+ splx(s);
+}
+
+/*
+ * Return node's "name", even if it doesn't have one.
+ */
+static const char *
+ng_bridge_nodename(node_p node)
+{
+ static char name[NG_NODELEN+1];
+
+ if (node->name != NULL)
+ snprintf(name, sizeof(name), "%s", node->name);
+ else
+ snprintf(name, sizeof(name), "[%x]", ng_node2ID(node));
+ return name;
+}
+
diff --git a/sys/netgraph/ng_bridge.h b/sys/netgraph/ng_bridge.h
new file mode 100644
index 000000000000..7c83d3fa5bc5
--- /dev/null
+++ b/sys/netgraph/ng_bridge.h
@@ -0,0 +1,162 @@
+
+/*
+ * ng_bridge.h
+ *
+ * Copyright (c) 2000 Whistle Communications, Inc.
+ * All rights reserved.
+ *
+ * Subject to the following obligations and disclaimer of warranty, use and
+ * redistribution of this software, in source or object code forms, with or
+ * without modifications are expressly permitted by Whistle Communications;
+ * provided, however, that:
+ * 1. Any and all reproductions of the source or object code must include the
+ * copyright notice above and the following disclaimer of warranties; and
+ * 2. No rights are granted, in any manner or form, to use Whistle
+ * Communications, Inc. trademarks, including the mark "WHISTLE
+ * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
+ * such appears in the above copyright notice or in the software.
+ *
+ * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
+ * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
+ * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
+ * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
+ * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
+ * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
+ * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
+ * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
+ * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
+ * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
+ * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * Author: Archie Cobbs <archie@freebsd.org>
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _NETGRAPH_NG_BRIDGE_H_
+#define _NETGRAPH_NG_BRIDGE_H_
+
+/* Node type name and magic cookie */
+#define NG_BRIDGE_NODE_TYPE "bridge"
+#define NGM_BRIDGE_COOKIE 967239368
+
+/* Hook names */
+#define NG_BRIDGE_HOOK_LINK_PREFIX "link" /* append decimal integer */
+#define NG_BRIDGE_HOOK_LINK_FMT "link%d" /* for use with printf(3) */
+
+/* Maximum number of supported links */
+#define NG_BRIDGE_MAX_LINKS 32
+
+/* Node configuration structure */
+struct ng_bridge_config {
+ u_char ipfw[NG_BRIDGE_MAX_LINKS]; /* enable ipfw */
+ u_char debugLevel; /* debug level */
+ u_int32_t loopTimeout; /* link loopback mute time */
+ u_int32_t maxStaleness; /* max host age before nuking */
+ u_int32_t minStableAge; /* min time for a stable host */
+};
+
+/* Keep this in sync with the above structure definition */
+#define NG_BRIDGE_CONFIG_TYPE_INFO(ainfo) { \
+ { \
+ { "ipfw", (ainfo) }, \
+ { "debugLevel", &ng_parse_uint8_type }, \
+ { "loopTimeout", &ng_parse_uint32_type }, \
+ { "maxStaleness", &ng_parse_uint32_type }, \
+ { "minStableAge", &ng_parse_uint32_type }, \
+ { NULL } \
+ } \
+}
+
+/* Statistics structure (one for each link) */
+struct ng_bridge_link_stats {
+ u_int64_t recvOctets; /* total octets rec'd on link */
+ u_int64_t recvPackets; /* total pkts rec'd on link */
+ u_int64_t recvMulticasts; /* multicast pkts rec'd on link */
+ u_int64_t recvBroadcasts; /* broadcast pkts rec'd on link */
+ u_int64_t recvUnknown; /* pkts rec'd with unknown dest addr */
+ u_int64_t recvRunts; /* pkts rec'd less than 14 bytes */
+ u_int64_t recvInvalid; /* pkts rec'd with bogus source addr */
+ u_int64_t xmitOctets; /* total octets xmit'd on link */
+ u_int64_t xmitPackets; /* total pkts xmit'd on link */
+ u_int64_t xmitMulticasts; /* multicast pkts xmit'd on link */
+ u_int64_t xmitBroadcasts; /* broadcast pkts xmit'd on link */
+ u_int64_t loopDrops; /* pkts dropped due to loopback */
+ u_int64_t loopDetects; /* number of loop detections */
+ u_int64_t memoryFailures; /* times couldn't get mem or mbuf */
+};
+
+/* Keep this in sync with the above structure definition */
+#define NG_BRIDGE_STATS_TYPE_INFO { \
+ { \
+ { "recvOctets", &ng_parse_uint64_type }, \
+ { "recvPackets", &ng_parse_uint64_type }, \
+ { "recvMulticast", &ng_parse_uint64_type }, \
+ { "recvBroadcast", &ng_parse_uint64_type }, \
+ { "recvUnknown", &ng_parse_uint64_type }, \
+ { "recvRunts", &ng_parse_uint64_type }, \
+ { "recvInvalid", &ng_parse_uint64_type }, \
+ { "xmitOctets", &ng_parse_uint64_type }, \
+ { "xmitPackets", &ng_parse_uint64_type }, \
+ { "xmitMulticasts", &ng_parse_uint64_type }, \
+ { "xmitBroadcasts", &ng_parse_uint64_type }, \
+ { "loopDrops", &ng_parse_uint64_type }, \
+ { "loopDetects", &ng_parse_uint64_type }, \
+ { "memoryFailures", &ng_parse_uint64_type }, \
+ { NULL } \
+ } \
+}
+
+/* Structure describing a single host */
+struct ng_bridge_host {
+ u_char addr[6]; /* ethernet address */
+ u_int16_t linkNum; /* link where addr can be found */
+ u_int16_t age; /* seconds ago entry was created */
+ u_int16_t staleness; /* seconds ago host last heard from */
+};
+
+/* Keep this in sync with the above structure definition */
+#define NG_BRIDGE_HOST_TYPE_INFO(entype) { \
+ { \
+ { "addr", (entype) }, \
+ { "linkNum", &ng_parse_uint16_type }, \
+ { "age", &ng_parse_uint16_type }, \
+ { "staleness", &ng_parse_uint16_type }, \
+ { NULL } \
+ } \
+}
+
+/* Structure returned by NGM_BRIDGE_GET_TABLE */
+struct ng_bridge_host_ary {
+ u_int32_t numHosts;
+ struct ng_bridge_host hosts[0];
+};
+
+/* Keep this in sync with the above structure definition */
+#define NG_BRIDGE_HOST_ARY_TYPE_INFO(harytype) { \
+ { \
+ { "numHosts", &ng_parse_uint32_type }, \
+ { "hosts", (harytype) }, \
+ { NULL } \
+ } \
+}
+
+/* Netgraph control messages */
+enum {
+ NGM_BRIDGE_SET_CONFIG = 1, /* set node configuration */
+ NGM_BRIDGE_GET_CONFIG, /* get node configuration */
+ NGM_BRIDGE_RESET, /* reset (forget) all information */
+ NGM_BRIDGE_GET_STATS, /* get link stats */
+ NGM_BRIDGE_CLR_STATS, /* clear link stats */
+ NGM_BRIDGE_GETCLR_STATS, /* atomically get & clear link stats */
+ NGM_BRIDGE_GET_TABLE, /* get link table */
+};
+
+#endif /* _NETGRAPH_NG_BRIDGE_H_ */
+