This parameter was set to the hook that terminated the iteration early. However, none of the remaining callers used this argument and it was always set to an otherwise-unused variable.
1218 lines
34 KiB
C
1218 lines
34 KiB
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/lock.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/rwlock.h>
|
|
#include <sys/syslog.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/ctype.h>
|
|
#include <sys/types.h>
|
|
#include <sys/counter.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/if_var.h>
|
|
#include <net/ethernet.h>
|
|
#include <net/vnet.h>
|
|
|
|
#include <netinet/in.h>
|
|
#if 0 /* not used yet */
|
|
#include <netinet/ip_fw.h>
|
|
#endif
|
|
#include <netgraph/ng_message.h>
|
|
#include <netgraph/netgraph.h>
|
|
#include <netgraph/ng_parse.h>
|
|
#include <netgraph/ng_bridge.h>
|
|
|
|
#ifdef NG_SEPARATE_MALLOC
|
|
static MALLOC_DEFINE(M_NETGRAPH_BRIDGE, "netgraph_bridge",
|
|
"netgraph bridge node");
|
|
#else
|
|
#define M_NETGRAPH_BRIDGE M_NETGRAPH
|
|
#endif
|
|
|
|
/* Counter based stats */
|
|
struct ng_bridge_link_kernel_stats {
|
|
counter_u64_t recvOctets; /* total octets rec'd on link */
|
|
counter_u64_t recvPackets; /* total pkts rec'd on link */
|
|
counter_u64_t recvMulticasts; /* multicast pkts rec'd on link */
|
|
counter_u64_t recvBroadcasts; /* broadcast pkts rec'd on link */
|
|
counter_u64_t recvUnknown; /* pkts rec'd with unknown dest addr */
|
|
counter_u64_t recvRunts; /* pkts rec'd less than 14 bytes */
|
|
counter_u64_t recvInvalid; /* pkts rec'd with bogus source addr */
|
|
counter_u64_t xmitOctets; /* total octets xmit'd on link */
|
|
counter_u64_t xmitPackets; /* total pkts xmit'd on link */
|
|
counter_u64_t xmitMulticasts; /* multicast pkts xmit'd on link */
|
|
counter_u64_t xmitBroadcasts; /* broadcast pkts xmit'd on link */
|
|
counter_u64_t loopDrops; /* pkts dropped due to loopback */
|
|
u_int64_t loopDetects; /* number of loop detections */
|
|
counter_u64_t memoryFailures; /* times couldn't get mem or mbuf */
|
|
};
|
|
|
|
/* Per-link private data */
|
|
struct ng_bridge_link {
|
|
hook_p hook; /* netgraph hook */
|
|
u_int16_t loopCount; /* loop ignore timer */
|
|
unsigned int learnMac : 1, /* autolearn macs */
|
|
sendUnknown : 1;/* send unknown macs out */
|
|
struct ng_bridge_link_kernel_stats stats; /* link stats */
|
|
};
|
|
typedef struct ng_bridge_link const *link_cp; /* read only access */
|
|
|
|
/* Per-node private data */
|
|
struct ng_bridge_private {
|
|
struct ng_bridge_bucket *tab; /* hash table bucket array */
|
|
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 */
|
|
unsigned int persistent : 1, /* can exist w/o hooks */
|
|
sendUnknown : 1;/* links receive unknowns by default */
|
|
struct callout timer; /* one second periodic timer */
|
|
};
|
|
typedef struct ng_bridge_private *priv_p;
|
|
typedef struct ng_bridge_private const *priv_cp; /* read only access */
|
|
|
|
/* Information about a host, stored in a hash table entry */
|
|
struct ng_bridge_host {
|
|
u_char addr[6]; /* ethernet address */
|
|
link_p link; /* 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 */
|
|
SLIST_ENTRY(ng_bridge_host) next; /* next entry in bucket */
|
|
};
|
|
|
|
/* Hash table bucket declaration */
|
|
SLIST_HEAD(ng_bridge_bucket, ng_bridge_host);
|
|
|
|
/* Netgraph node methods */
|
|
static ng_constructor_t ng_bridge_constructor;
|
|
static ng_rcvmsg_t ng_bridge_rcvmsg;
|
|
static ng_shutdown_t ng_bridge_shutdown;
|
|
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 void ng_bridge_free_link(link_p link);
|
|
static struct ng_bridge_host *ng_bridge_get(priv_cp priv, const u_char *addr);
|
|
static int ng_bridge_put(priv_p priv, const u_char *addr, link_p link);
|
|
static void ng_bridge_rehash(priv_p priv);
|
|
static void ng_bridge_remove_hosts(priv_p priv, link_p link);
|
|
static void ng_bridge_timeout(node_p node, hook_p hook, void *arg1, int arg2);
|
|
static const char *ng_bridge_nodename(node_cp node);
|
|
|
|
/* Ethernet broadcast */
|
|
static const u_char ng_bridge_bcast_addr[ETHER_ADDR_LEN] =
|
|
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
|
|
|
|
/* 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_field ng_bridge_host_type_fields[]
|
|
= NG_BRIDGE_HOST_TYPE_INFO(&ng_parse_enaddr_type);
|
|
static const struct ng_parse_type ng_bridge_host_type = {
|
|
&ng_parse_struct_type,
|
|
&ng_bridge_host_type_fields
|
|
};
|
|
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_field ng_bridge_host_ary_type_fields[]
|
|
= 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_fields
|
|
};
|
|
|
|
/* Parse type for struct ng_bridge_config */
|
|
static const struct ng_parse_struct_field ng_bridge_config_type_fields[]
|
|
= NG_BRIDGE_CONFIG_TYPE_INFO;
|
|
static const struct ng_parse_type ng_bridge_config_type = {
|
|
&ng_parse_struct_type,
|
|
&ng_bridge_config_type_fields
|
|
};
|
|
|
|
/* Parse type for struct ng_bridge_link_stat */
|
|
static const struct ng_parse_struct_field ng_bridge_stats_type_fields[]
|
|
= NG_BRIDGE_STATS_TYPE_INFO;
|
|
static const struct ng_parse_type ng_bridge_stats_type = {
|
|
&ng_parse_struct_type,
|
|
&ng_bridge_stats_type_fields
|
|
};
|
|
/* Parse type for struct ng_bridge_move_host */
|
|
static const struct ng_parse_struct_field ng_bridge_move_host_type_fields[]
|
|
= NG_BRIDGE_MOVE_HOST_TYPE_INFO(&ng_parse_enaddr_type);
|
|
static const struct ng_parse_type ng_bridge_move_host_type = {
|
|
&ng_parse_struct_type,
|
|
&ng_bridge_move_host_type_fields
|
|
};
|
|
|
|
/* 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
|
|
},
|
|
{
|
|
NGM_BRIDGE_COOKIE,
|
|
NGM_BRIDGE_SET_PERSISTENT,
|
|
"setpersistent",
|
|
NULL,
|
|
NULL
|
|
},
|
|
{
|
|
NGM_BRIDGE_COOKIE,
|
|
NGM_BRIDGE_MOVE_HOST,
|
|
"movehost",
|
|
&ng_bridge_move_host_type,
|
|
NULL
|
|
},
|
|
{ 0 }
|
|
};
|
|
|
|
/* Node type descriptor */
|
|
static struct ng_type ng_bridge_typestruct = {
|
|
.version = NG_ABI_VERSION,
|
|
.name = NG_BRIDGE_NODE_TYPE,
|
|
.constructor = ng_bridge_constructor,
|
|
.rcvmsg = ng_bridge_rcvmsg,
|
|
.shutdown = ng_bridge_shutdown,
|
|
.newhook = ng_bridge_newhook,
|
|
.rcvdata = ng_bridge_rcvdata,
|
|
.disconnect = ng_bridge_disconnect,
|
|
.cmdlist = ng_bridge_cmdlist,
|
|
};
|
|
NETGRAPH_INIT(bridge, &ng_bridge_typestruct);
|
|
|
|
/******************************************************************
|
|
NETGRAPH NODE METHODS
|
|
******************************************************************/
|
|
|
|
/*
|
|
* Node constructor
|
|
*/
|
|
static int
|
|
ng_bridge_constructor(node_p node)
|
|
{
|
|
priv_p priv;
|
|
|
|
/* Allocate and initialize private info */
|
|
priv = malloc(sizeof(*priv), M_NETGRAPH_BRIDGE, M_WAITOK | M_ZERO);
|
|
ng_callout_init(&priv->timer);
|
|
|
|
/* Allocate and initialize hash table, etc. */
|
|
priv->tab = malloc(MIN_BUCKETS * sizeof(*priv->tab),
|
|
M_NETGRAPH_BRIDGE, M_WAITOK | M_ZERO);
|
|
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;
|
|
priv->sendUnknown = 1; /* classic bridge */
|
|
|
|
NG_NODE_SET_PRIVATE(node, priv);
|
|
priv->node = node;
|
|
|
|
/* Start timer; timer is always running while node is alive */
|
|
ng_callout(&priv->timer, node, NULL, hz, ng_bridge_timeout, NULL, 0);
|
|
|
|
/* Done */
|
|
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 = NG_NODE_PRIVATE(node);
|
|
char linkName[NG_HOOKSIZ];
|
|
u_int32_t linkNum;
|
|
link_p link;
|
|
const char *prefix = NG_BRIDGE_HOOK_LINK_PREFIX;
|
|
bool isUplink;
|
|
|
|
/* Check for a link hook */
|
|
if (strlen(name) <= strlen(prefix))
|
|
return (EINVAL); /* Unknown hook name */
|
|
|
|
isUplink = (name[0] == 'u');
|
|
if (isUplink)
|
|
prefix = NG_BRIDGE_HOOK_UPLINK_PREFIX;
|
|
|
|
/* primitive parsing */
|
|
linkNum = strtoul(name + strlen(prefix), NULL, 10);
|
|
/* validation by comparing against the reconstucted name */
|
|
snprintf(linkName, sizeof(linkName), "%s%u", prefix, linkNum);
|
|
if (strcmp(linkName, name) != 0)
|
|
return (EINVAL);
|
|
|
|
if (linkNum == 0 && isUplink)
|
|
return (EINVAL);
|
|
|
|
if(NG_PEER_NODE(hook) == node)
|
|
return (ELOOP);
|
|
|
|
link = malloc(sizeof(*link), M_NETGRAPH_BRIDGE, M_NOWAIT | M_ZERO);
|
|
if (link == NULL)
|
|
return (ENOMEM);
|
|
|
|
#define NG_BRIDGE_COUNTER_ALLOC(f) do { \
|
|
link->stats.f = counter_u64_alloc(M_NOWAIT); \
|
|
if (link->stats.f == NULL) \
|
|
goto nomem; \
|
|
} while (0)
|
|
NG_BRIDGE_COUNTER_ALLOC(recvOctets);
|
|
NG_BRIDGE_COUNTER_ALLOC(recvPackets);
|
|
NG_BRIDGE_COUNTER_ALLOC(recvMulticasts);
|
|
NG_BRIDGE_COUNTER_ALLOC(recvBroadcasts);
|
|
NG_BRIDGE_COUNTER_ALLOC(recvUnknown);
|
|
NG_BRIDGE_COUNTER_ALLOC(recvRunts);
|
|
NG_BRIDGE_COUNTER_ALLOC(recvInvalid);
|
|
NG_BRIDGE_COUNTER_ALLOC(xmitOctets);
|
|
NG_BRIDGE_COUNTER_ALLOC(xmitPackets);
|
|
NG_BRIDGE_COUNTER_ALLOC(xmitMulticasts);
|
|
NG_BRIDGE_COUNTER_ALLOC(xmitBroadcasts);
|
|
NG_BRIDGE_COUNTER_ALLOC(loopDrops);
|
|
NG_BRIDGE_COUNTER_ALLOC(memoryFailures);
|
|
#undef NG_BRIDGE_COUNTER_ALLOC
|
|
|
|
link->hook = hook;
|
|
if (isUplink) {
|
|
link->learnMac = 0;
|
|
link->sendUnknown = 1;
|
|
if (priv->numLinks == 0) /* if the first link is an uplink */
|
|
priv->sendUnknown = 0; /* switch to restrictive mode */
|
|
} else {
|
|
link->learnMac = 1;
|
|
link->sendUnknown = priv->sendUnknown;
|
|
}
|
|
|
|
NG_HOOK_SET_PRIVATE(hook, link);
|
|
priv->numLinks++;
|
|
return (0);
|
|
|
|
nomem:
|
|
ng_bridge_free_link(link);
|
|
return (ENOMEM);
|
|
}
|
|
|
|
/*
|
|
* Receive a control message
|
|
*/
|
|
static void
|
|
ng_bridge_clear_link_stats(struct ng_bridge_link_kernel_stats *p)
|
|
{
|
|
counter_u64_zero(p->recvOctets);
|
|
counter_u64_zero(p->recvPackets);
|
|
counter_u64_zero(p->recvMulticasts);
|
|
counter_u64_zero(p->recvBroadcasts);
|
|
counter_u64_zero(p->recvUnknown);
|
|
counter_u64_zero(p->recvRunts);
|
|
counter_u64_zero(p->recvInvalid);
|
|
counter_u64_zero(p->xmitOctets);
|
|
counter_u64_zero(p->xmitPackets);
|
|
counter_u64_zero(p->xmitMulticasts);
|
|
counter_u64_zero(p->xmitBroadcasts);
|
|
counter_u64_zero(p->loopDrops);
|
|
p->loopDetects = 0;
|
|
counter_u64_zero(p->memoryFailures);
|
|
}
|
|
|
|
static void
|
|
ng_bridge_free_link(link_p link)
|
|
{
|
|
counter_u64_free(link->stats.recvOctets);
|
|
counter_u64_free(link->stats.recvPackets);
|
|
counter_u64_free(link->stats.recvMulticasts);
|
|
counter_u64_free(link->stats.recvBroadcasts);
|
|
counter_u64_free(link->stats.recvUnknown);
|
|
counter_u64_free(link->stats.recvRunts);
|
|
counter_u64_free(link->stats.recvInvalid);
|
|
counter_u64_free(link->stats.xmitOctets);
|
|
counter_u64_free(link->stats.xmitPackets);
|
|
counter_u64_free(link->stats.xmitMulticasts);
|
|
counter_u64_free(link->stats.xmitBroadcasts);
|
|
counter_u64_free(link->stats.loopDrops);
|
|
counter_u64_free(link->stats.memoryFailures);
|
|
free(link, M_NETGRAPH_BRIDGE);
|
|
}
|
|
|
|
static int
|
|
ng_bridge_reset_link(hook_p hook, void *arg __unused)
|
|
{
|
|
link_p priv = NG_HOOK_PRIVATE(hook);
|
|
|
|
priv->loopCount = 0;
|
|
ng_bridge_clear_link_stats(&priv->stats);
|
|
return (1);
|
|
}
|
|
|
|
static int
|
|
ng_bridge_rcvmsg(node_p node, item_p item, hook_p lasthook)
|
|
{
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
|
struct ng_mesg *resp = NULL;
|
|
int error = 0;
|
|
struct ng_mesg *msg;
|
|
|
|
NGI_GET_MSG(item, msg);
|
|
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;
|
|
|
|
if (msg->header.arglen
|
|
!= sizeof(struct ng_bridge_config)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
conf = (struct ng_bridge_config *)msg->data;
|
|
priv->conf = *conf;
|
|
break;
|
|
}
|
|
case NGM_BRIDGE_RESET:
|
|
{
|
|
/* Flush all entries in the hash table */
|
|
ng_bridge_remove_hosts(priv, NULL);
|
|
|
|
/* Reset all loop detection counters and stats */
|
|
NG_NODE_FOREACH_HOOK(node, ng_bridge_reset_link, NULL);
|
|
break;
|
|
}
|
|
case NGM_BRIDGE_GET_STATS:
|
|
case NGM_BRIDGE_CLR_STATS:
|
|
case NGM_BRIDGE_GETCLR_STATS:
|
|
{
|
|
hook_p hook;
|
|
link_p link;
|
|
char linkName[NG_HOOKSIZ];
|
|
int linkNum;
|
|
|
|
/* Get link number */
|
|
if (msg->header.arglen != sizeof(u_int32_t)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
linkNum = *((int32_t *)msg->data);
|
|
if (linkNum < 0)
|
|
snprintf(linkName, sizeof(linkName),
|
|
"%s%u", NG_BRIDGE_HOOK_UPLINK_PREFIX, -linkNum);
|
|
else
|
|
snprintf(linkName, sizeof(linkName),
|
|
"%s%u", NG_BRIDGE_HOOK_LINK_PREFIX, linkNum);
|
|
|
|
if ((hook = ng_findhook(node, linkName)) == NULL) {
|
|
error = ENOTCONN;
|
|
break;
|
|
}
|
|
link = NG_HOOK_PRIVATE(hook);
|
|
|
|
/* Get/clear stats */
|
|
if (msg->header.cmd != NGM_BRIDGE_CLR_STATS) {
|
|
struct ng_bridge_link_stats *rs;
|
|
|
|
NG_MKRESPONSE(resp, msg,
|
|
sizeof(link->stats), M_NOWAIT);
|
|
if (resp == NULL) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
rs = (struct ng_bridge_link_stats *)resp->data;
|
|
#define FETCH(x) rs->x = counter_u64_fetch(link->stats.x)
|
|
FETCH(recvOctets);
|
|
FETCH(recvPackets);
|
|
FETCH(recvMulticasts);
|
|
FETCH(recvBroadcasts);
|
|
FETCH(recvUnknown);
|
|
FETCH(recvRunts);
|
|
FETCH(recvInvalid);
|
|
FETCH(xmitOctets);
|
|
FETCH(xmitPackets);
|
|
FETCH(xmitMulticasts);
|
|
FETCH(xmitBroadcasts);
|
|
FETCH(loopDrops);
|
|
rs->loopDetects = link->stats.loopDetects;
|
|
FETCH(memoryFailures);
|
|
#undef FETCH
|
|
}
|
|
if (msg->header.cmd != NGM_BRIDGE_GET_STATS)
|
|
ng_bridge_clear_link_stats(&link->stats);
|
|
break;
|
|
}
|
|
case NGM_BRIDGE_GET_TABLE:
|
|
{
|
|
struct ng_bridge_host_ary *ary;
|
|
struct ng_bridge_host *host;
|
|
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(host, &priv->tab[bucket], next) {
|
|
memcpy(ary->hosts[i].addr,
|
|
host->addr,
|
|
sizeof(ary->hosts[i].addr));
|
|
ary->hosts[i].age = host->age;
|
|
ary->hosts[i].staleness = host->staleness;
|
|
strncpy(ary->hosts[i].hook,
|
|
NG_HOOK_NAME(host->link->hook),
|
|
sizeof(ary->hosts[i].hook));
|
|
i++;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case NGM_BRIDGE_SET_PERSISTENT:
|
|
{
|
|
priv->persistent = 1;
|
|
break;
|
|
}
|
|
case NGM_BRIDGE_MOVE_HOST:
|
|
{
|
|
struct ng_bridge_move_host *mh;
|
|
hook_p hook;
|
|
|
|
if (msg->header.arglen < sizeof(*mh)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
mh = (struct ng_bridge_move_host *)msg->data;
|
|
hook = (mh->hook[0] == 0)
|
|
? lasthook
|
|
: ng_findhook(node, mh->hook);
|
|
if (hook == NULL) {
|
|
error = ENOENT;
|
|
break;
|
|
}
|
|
error = ng_bridge_put(priv, mh->addr, NG_HOOK_PRIVATE(hook));
|
|
break;
|
|
}
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
/* Done */
|
|
NG_RESPOND_MSG(error, node, item, resp);
|
|
NG_FREE_MSG(msg);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Receive data on a hook
|
|
*/
|
|
struct ng_bridge_send_ctx {
|
|
link_p foundFirst, incoming;
|
|
struct mbuf * m;
|
|
int manycast, error;
|
|
};
|
|
|
|
/*
|
|
* Update stats and send out
|
|
*/
|
|
static inline int
|
|
ng_bridge_send_data(link_cp dst, int manycast, struct mbuf *m, item_p item) {
|
|
int error = 0;
|
|
size_t len = m->m_pkthdr.len;
|
|
|
|
if(item != NULL)
|
|
NG_FWD_NEW_DATA(error, item, dst->hook, m);
|
|
else
|
|
NG_SEND_DATA_ONLY(error, dst->hook, m);
|
|
|
|
if (error) {
|
|
if (error == ENOMEM)
|
|
counter_u64_add(dst->stats.memoryFailures, 1);
|
|
/* The packet is still ours */
|
|
if (item != NULL)
|
|
NG_FREE_ITEM(item);
|
|
if (m != NULL)
|
|
NG_FREE_M(m);
|
|
return (error);
|
|
}
|
|
|
|
counter_u64_add(dst->stats.xmitPackets, 1);
|
|
counter_u64_add(dst->stats.xmitOctets, len);
|
|
switch (manycast) {
|
|
default: /* unknown unicast */
|
|
break;
|
|
case 1: /* multicast */
|
|
counter_u64_add(dst->stats.xmitMulticasts, 1);
|
|
break;
|
|
case 2: /* broadcast */
|
|
counter_u64_add(dst->stats.xmitBroadcasts, 1);
|
|
break;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Loop body for sending to multiple destinations
|
|
* return 0 to stop looping
|
|
*/
|
|
static int
|
|
ng_bridge_send_ctx(hook_p dst, void *arg)
|
|
{
|
|
struct ng_bridge_send_ctx *ctx = arg;
|
|
link_p destLink = NG_HOOK_PRIVATE(dst);
|
|
struct mbuf *m2 = NULL;
|
|
int error = 0;
|
|
|
|
/* Skip incoming link */
|
|
if (destLink == ctx->incoming) {
|
|
return (1);
|
|
}
|
|
|
|
/* Skip sending unknowns to undesired links */
|
|
if (!ctx->manycast && !destLink->sendUnknown)
|
|
return (1);
|
|
|
|
if (ctx->foundFirst == NULL) {
|
|
/*
|
|
* This is the first usable link we have found.
|
|
* Reserve it for the originals.
|
|
* If we never find another we save a copy.
|
|
*/
|
|
ctx->foundFirst = destLink;
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* It's usable link but not the reserved (first) one.
|
|
* Copy mbuf info for sending.
|
|
*/
|
|
m2 = m_dup(ctx->m, M_NOWAIT);
|
|
if (m2 == NULL) {
|
|
counter_u64_add(ctx->incoming->stats.memoryFailures, 1);
|
|
ctx->error = ENOBUFS;
|
|
return (0); /* abort loop, do not try again and again */
|
|
}
|
|
|
|
/* Send packet */
|
|
error = ng_bridge_send_data(destLink, ctx->manycast, m2, NULL);
|
|
if (error)
|
|
ctx->error = error;
|
|
return (1);
|
|
}
|
|
|
|
static int
|
|
ng_bridge_rcvdata(hook_p hook, item_p item)
|
|
{
|
|
const node_p node = NG_HOOK_NODE(hook);
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
|
struct ng_bridge_host *host;
|
|
struct ether_header *eh;
|
|
struct ng_bridge_send_ctx ctx = { 0 };
|
|
|
|
NGI_GET_M(item, ctx.m);
|
|
|
|
ctx.incoming = NG_HOOK_PRIVATE(hook);
|
|
/* Sanity check packet and pull up header */
|
|
if (ctx.m->m_pkthdr.len < ETHER_HDR_LEN) {
|
|
counter_u64_add(ctx.incoming->stats.recvRunts, 1);
|
|
NG_FREE_ITEM(item);
|
|
NG_FREE_M(ctx.m);
|
|
return (EINVAL);
|
|
}
|
|
if (ctx.m->m_len < ETHER_HDR_LEN && !(ctx.m = m_pullup(ctx.m, ETHER_HDR_LEN))) {
|
|
counter_u64_add(ctx.incoming->stats.memoryFailures, 1);
|
|
NG_FREE_ITEM(item);
|
|
return (ENOBUFS);
|
|
}
|
|
eh = mtod(ctx.m, struct ether_header *);
|
|
if ((eh->ether_shost[0] & 1) != 0) {
|
|
counter_u64_add(ctx.incoming->stats.recvInvalid, 1);
|
|
NG_FREE_ITEM(item);
|
|
NG_FREE_M(ctx.m);
|
|
return (EINVAL);
|
|
}
|
|
|
|
/* Is link disabled due to a loopback condition? */
|
|
if (ctx.incoming->loopCount != 0) {
|
|
counter_u64_add(ctx.incoming->stats.loopDrops, 1);
|
|
NG_FREE_ITEM(item);
|
|
NG_FREE_M(ctx.m);
|
|
return (ELOOP);
|
|
}
|
|
|
|
/* Update stats */
|
|
counter_u64_add(ctx.incoming->stats.recvPackets, 1);
|
|
counter_u64_add(ctx.incoming->stats.recvOctets, ctx.m->m_pkthdr.len);
|
|
if ((ctx.manycast = (eh->ether_dhost[0] & 1)) != 0) {
|
|
if (ETHER_EQUAL(eh->ether_dhost, ng_bridge_bcast_addr)) {
|
|
counter_u64_add(ctx.incoming->stats.recvBroadcasts, 1);
|
|
ctx.manycast = 2;
|
|
} else
|
|
counter_u64_add(ctx.incoming->stats.recvMulticasts, 1);
|
|
}
|
|
|
|
/* 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.
|
|
* This is safe without locking, because it's
|
|
* the only operation during shared access.
|
|
*/
|
|
if (__predict_false(host->staleness > 0))
|
|
host->staleness = 0;
|
|
|
|
if ((host == NULL && ctx.incoming->learnMac) ||
|
|
(host != NULL && host->link != ctx.incoming)) {
|
|
struct ng_mesg *msg;
|
|
struct ng_bridge_move_host *mh;
|
|
int error = 0;
|
|
|
|
NG_MKMESSAGE(msg, NGM_BRIDGE_COOKIE, NGM_BRIDGE_MOVE_HOST,
|
|
sizeof(*mh), M_NOWAIT);
|
|
if (msg == NULL) {
|
|
counter_u64_add(ctx.incoming->stats.memoryFailures, 1);
|
|
NG_FREE_ITEM(item);
|
|
NG_FREE_M(ctx.m);
|
|
return (ENOMEM);
|
|
}
|
|
mh = (struct ng_bridge_move_host *)msg->data;
|
|
strncpy(mh->hook, NG_HOOK_NAME(ctx.incoming->hook),
|
|
sizeof(mh->hook));
|
|
memcpy(mh->addr, eh->ether_shost, sizeof(mh->addr));
|
|
NG_SEND_MSG_ID(error, node, msg, NG_NODE_ID(node),
|
|
NG_NODE_ID(node));
|
|
if (error)
|
|
counter_u64_add(ctx.incoming->stats.memoryFailures, 1);
|
|
}
|
|
|
|
if (host != NULL && host->link != ctx.incoming) {
|
|
if (host->age < priv->conf.minStableAge) {
|
|
/* Drop packet on instable links */
|
|
counter_u64_add(ctx.incoming->stats.loopDrops, 1);
|
|
NG_FREE_ITEM(item);
|
|
NG_FREE_M(ctx.m);
|
|
return (ELOOP);
|
|
}
|
|
}
|
|
|
|
/* Run packet through ipfw processing, if enabled */
|
|
#if 0
|
|
if (priv->conf.ipfw[linkNum] && V_fw_enable && V_ip_fw_chk_ptr != NULL) {
|
|
/* XXX not implemented yet */
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* If unicast and destination host known, deliver to host's link,
|
|
* unless it is the same link as the packet came in on.
|
|
*/
|
|
if (!ctx.manycast) {
|
|
/* Determine packet destination link */
|
|
if ((host = ng_bridge_get(priv, eh->ether_dhost)) != NULL) {
|
|
link_p destLink = host->link;
|
|
|
|
/* If destination same as incoming link, do nothing */
|
|
if (destLink == ctx.incoming) {
|
|
NG_FREE_ITEM(item);
|
|
NG_FREE_M(ctx.m);
|
|
return (0);
|
|
}
|
|
|
|
/* Deliver packet out the destination link */
|
|
return (ng_bridge_send_data(destLink, ctx.manycast, ctx.m, item));
|
|
}
|
|
|
|
/* Destination host is not known */
|
|
counter_u64_add(ctx.incoming->stats.recvUnknown, 1);
|
|
}
|
|
|
|
/* Distribute unknown, multicast, broadcast pkts to all other links */
|
|
NG_NODE_FOREACH_HOOK(node, ng_bridge_send_ctx, &ctx);
|
|
|
|
/* Finally send out on the first link found */
|
|
if (ctx.foundFirst != NULL) {
|
|
int error = ng_bridge_send_data(ctx.foundFirst, ctx.manycast, ctx.m, item);
|
|
if (error)
|
|
ctx.error = error;
|
|
} else { /* nothing to send at all */
|
|
NG_FREE_ITEM(item);
|
|
NG_FREE_M(ctx.m);
|
|
}
|
|
|
|
return (ctx.error);
|
|
}
|
|
|
|
/*
|
|
* Shutdown node
|
|
*/
|
|
static int
|
|
ng_bridge_shutdown(node_p node)
|
|
{
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
|
|
|
/*
|
|
* Shut down everything including the timer. Even if the
|
|
* callout has already been dequeued and is about to be
|
|
* run, ng_bridge_timeout() won't be fired as the node
|
|
* is already marked NGF_INVALID, so we're safe to free
|
|
* the node now.
|
|
*/
|
|
KASSERT(priv->numLinks == 0 && priv->numHosts == 0,
|
|
("%s: numLinks=%d numHosts=%d",
|
|
__func__, priv->numLinks, priv->numHosts));
|
|
ng_uncallout(&priv->timer, node);
|
|
NG_NODE_SET_PRIVATE(node, NULL);
|
|
NG_NODE_UNREF(node);
|
|
free(priv->tab, M_NETGRAPH_BRIDGE);
|
|
free(priv, M_NETGRAPH_BRIDGE);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Hook disconnection.
|
|
*/
|
|
static int
|
|
ng_bridge_disconnect(hook_p hook)
|
|
{
|
|
const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
|
|
link_p link = NG_HOOK_PRIVATE(hook);
|
|
|
|
/* Remove all hosts associated with this link */
|
|
ng_bridge_remove_hosts(priv, link);
|
|
|
|
/* Free associated link information */
|
|
ng_bridge_free_link(link);
|
|
priv->numLinks--;
|
|
|
|
/* If no more hooks, go away */
|
|
if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
|
|
&& (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))
|
|
&& !priv->persistent) {
|
|
ng_rmnode_self(NG_HOOK_NODE(hook));
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/******************************************************************
|
|
HASH TABLE FUNCTIONS
|
|
******************************************************************/
|
|
|
|
/*
|
|
* Hash algorithm
|
|
*/
|
|
#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_cp priv, const u_char *addr)
|
|
{
|
|
const int bucket = HASH(addr, priv->hashMask);
|
|
struct ng_bridge_host *host;
|
|
|
|
SLIST_FOREACH(host, &priv->tab[bucket], next) {
|
|
if (ETHER_EQUAL(host->addr, addr))
|
|
return (host);
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Add a host entry to the table. If it already exists, move it
|
|
* to the new link. Returns 0 on success.
|
|
*/
|
|
static int
|
|
ng_bridge_put(priv_p priv, const u_char *addr, link_p link)
|
|
{
|
|
const int bucket = HASH(addr, priv->hashMask);
|
|
struct ng_bridge_host *host;
|
|
|
|
if ((host = ng_bridge_get(priv, addr)) != NULL) {
|
|
/* Host already on the correct link? */
|
|
if (host->link == link)
|
|
return 0;
|
|
|
|
/* Move old host over to new link */
|
|
if (host->age >= priv->conf.minStableAge) {
|
|
host->link = link;
|
|
host->age = 0;
|
|
return (0);
|
|
}
|
|
/*
|
|
* If the host was recently moved to the old link and
|
|
* it's now jumping to a new link, declare a loopback
|
|
* condition.
|
|
*/
|
|
if (priv->conf.debugLevel >= 2)
|
|
log(LOG_WARNING, "ng_bridge: %s:"
|
|
" loopback detected on %s\n",
|
|
ng_bridge_nodename(priv->node),
|
|
NG_HOOK_NAME(link->hook));
|
|
|
|
/* 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, link);
|
|
return (ELOOP);
|
|
}
|
|
|
|
/* Allocate and initialize new hashtable entry */
|
|
host = malloc(sizeof(*host), M_NETGRAPH_BRIDGE, M_NOWAIT);
|
|
if (host == NULL)
|
|
return (ENOMEM);
|
|
bcopy(addr, host->addr, ETHER_ADDR_LEN);
|
|
host->link = link;
|
|
host->staleness = 0;
|
|
host->age = 0;
|
|
|
|
/* Add new element to hash bucket */
|
|
SLIST_INSERT_HEAD(&priv->tab[bucket], host, next);
|
|
priv->numHosts++;
|
|
|
|
/* Resize table if necessary */
|
|
ng_bridge_rehash(priv);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* 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 */
|
|
newTab = malloc(newNumBuckets * sizeof(*newTab),
|
|
M_NETGRAPH_BRIDGE, M_NOWAIT | M_ZERO);
|
|
if (newTab == NULL)
|
|
return;
|
|
|
|
/* 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_host *const host
|
|
= SLIST_FIRST(oldList);
|
|
|
|
SLIST_REMOVE_HEAD(oldList, next);
|
|
newBucket = HASH(host->addr, newMask);
|
|
SLIST_INSERT_HEAD(&newTab[newBucket], host, 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_BRIDGE);
|
|
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, link_p link)
|
|
{
|
|
int bucket;
|
|
|
|
for (bucket = 0; bucket < priv->numBuckets; bucket++) {
|
|
struct ng_bridge_host **hptr = &SLIST_FIRST(&priv->tab[bucket]);
|
|
|
|
while (*hptr != NULL) {
|
|
struct ng_bridge_host *const host = *hptr;
|
|
|
|
if (link == NULL || host->link == link) {
|
|
*hptr = SLIST_NEXT(host, next);
|
|
free(host, M_NETGRAPH_BRIDGE);
|
|
priv->numHosts--;
|
|
} else
|
|
hptr = &SLIST_NEXT(host, 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 int
|
|
ng_bridge_unmute(hook_p hook, void *arg)
|
|
{
|
|
link_p link = NG_HOOK_PRIVATE(hook);
|
|
node_p node = NG_HOOK_NODE(hook);
|
|
priv_p priv = NG_NODE_PRIVATE(node);
|
|
int *counter = arg;
|
|
|
|
if (link->loopCount != 0) {
|
|
link->loopCount--;
|
|
if (link->loopCount == 0 && priv->conf.debugLevel >= 2) {
|
|
log(LOG_INFO, "ng_bridge: %s:"
|
|
" restoring looped back %s\n",
|
|
ng_bridge_nodename(node), NG_HOOK_NAME(hook));
|
|
}
|
|
}
|
|
(*counter)++;
|
|
return (1);
|
|
}
|
|
|
|
static void
|
|
ng_bridge_timeout(node_p node, hook_p hook, void *arg1, int arg2)
|
|
{
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
|
int bucket;
|
|
int counter = 0;
|
|
|
|
/* Update host time counters and remove stale entries */
|
|
for (bucket = 0; bucket < priv->numBuckets; bucket++) {
|
|
struct ng_bridge_host **hptr = &SLIST_FIRST(&priv->tab[bucket]);
|
|
|
|
while (*hptr != NULL) {
|
|
struct ng_bridge_host *const host = *hptr;
|
|
|
|
/* Remove hosts we haven't heard from in a while */
|
|
if (++host->staleness >= priv->conf.maxStaleness) {
|
|
*hptr = SLIST_NEXT(host, next);
|
|
free(host, M_NETGRAPH_BRIDGE);
|
|
priv->numHosts--;
|
|
} else {
|
|
if (host->age < 0xffff)
|
|
host->age++;
|
|
hptr = &SLIST_NEXT(host, next);
|
|
counter++;
|
|
}
|
|
}
|
|
}
|
|
KASSERT(priv->numHosts == counter,
|
|
("%s: hosts: %d != %d", __func__, priv->numHosts, counter));
|
|
|
|
/* Decrease table size if necessary */
|
|
ng_bridge_rehash(priv);
|
|
|
|
/* Decrease loop counter on muted looped back links */
|
|
counter = 0;
|
|
NG_NODE_FOREACH_HOOK(node, ng_bridge_unmute, &counter);
|
|
KASSERT(priv->numLinks == counter,
|
|
("%s: links: %d != %d", __func__, priv->numLinks, counter));
|
|
|
|
/* Register a new timeout, keeping the existing node reference */
|
|
ng_callout(&priv->timer, node, NULL, hz, ng_bridge_timeout, NULL, 0);
|
|
}
|
|
|
|
/*
|
|
* Return node's "name", even if it doesn't have one.
|
|
*/
|
|
static const char *
|
|
ng_bridge_nodename(node_cp node)
|
|
{
|
|
static char name[NG_NODESIZ];
|
|
|
|
if (NG_NODE_HAS_NAME(node))
|
|
snprintf(name, sizeof(name), "%s", NG_NODE_NAME(node));
|
|
else
|
|
snprintf(name, sizeof(name), "[%x]", ng_node2ID(node));
|
|
return name;
|
|
}
|