Deleted Added
sdiff udiff text old ( 121816 ) new ( 123600 )
full compact
ng_bridge.c (121816) ng_bridge.c (123600)
1
2/*
3 * ng_bridge.c
4 *
5 * Copyright (c) 2000 Whistle Communications, Inc.
6 * All rights reserved.
7 *
8 * Subject to the following obligations and disclaimer of warranty, use and
9 * redistribution of this software, in source or object code forms, with or
10 * without modifications are expressly permitted by Whistle Communications;
11 * provided, however, that:
12 * 1. Any and all reproductions of the source or object code must include the
13 * copyright notice above and the following disclaimer of warranties; and
14 * 2. No rights are granted, in any manner or form, to use Whistle
15 * Communications, Inc. trademarks, including the mark "WHISTLE
16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
17 * such appears in the above copyright notice or in the software.
18 *
19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
35 * OF SUCH DAMAGE.
36 *
37 * Author: Archie Cobbs <archie@freebsd.org>
38 *
1
2/*
3 * ng_bridge.c
4 *
5 * Copyright (c) 2000 Whistle Communications, Inc.
6 * All rights reserved.
7 *
8 * Subject to the following obligations and disclaimer of warranty, use and
9 * redistribution of this software, in source or object code forms, with or
10 * without modifications are expressly permitted by Whistle Communications;
11 * provided, however, that:
12 * 1. Any and all reproductions of the source or object code must include the
13 * copyright notice above and the following disclaimer of warranties; and
14 * 2. No rights are granted, in any manner or form, to use Whistle
15 * Communications, Inc. trademarks, including the mark "WHISTLE
16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
17 * such appears in the above copyright notice or in the software.
18 *
19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
35 * OF SUCH DAMAGE.
36 *
37 * Author: Archie Cobbs <archie@freebsd.org>
38 *
39 * $FreeBSD: head/sys/netgraph/ng_bridge.c 121816 2003-10-31 18:32:15Z brooks $
39 * $FreeBSD: head/sys/netgraph/ng_bridge.c 123600 2003-12-17 12:40:34Z ru $
40 */
41
42/*
43 * ng_bridge(4) netgraph node type
44 *
45 * The node performs standard intelligent Ethernet bridging over
46 * each of its connected hooks, or links. A simple loop detection
47 * algorithm is included which disables a link for priv->conf.loopTimeout
48 * seconds when a host is seen to have jumped from one link to
49 * another within priv->conf.minStableAge seconds.
50 *
51 * We keep a hashtable that maps Ethernet addresses to host info,
52 * which is contained in struct ng_bridge_host's. These structures
53 * tell us on which link the host may be found. A host's entry will
54 * expire after priv->conf.maxStaleness seconds.
55 *
56 * This node is optimzed for stable networks, where machines jump
57 * from one port to the other only rarely.
58 */
59
60#include <sys/param.h>
61#include <sys/systm.h>
62#include <sys/kernel.h>
63#include <sys/malloc.h>
64#include <sys/mbuf.h>
65#include <sys/errno.h>
66#include <sys/syslog.h>
67#include <sys/socket.h>
68#include <sys/ctype.h>
69
70#include <net/if.h>
71#include <net/ethernet.h>
72
73#include <netinet/in.h>
74#include <netinet/ip_fw.h>
75
76#include <netgraph/ng_message.h>
77#include <netgraph/netgraph.h>
78#include <netgraph/ng_parse.h>
79#include <netgraph/ng_bridge.h>
40 */
41
42/*
43 * ng_bridge(4) netgraph node type
44 *
45 * The node performs standard intelligent Ethernet bridging over
46 * each of its connected hooks, or links. A simple loop detection
47 * algorithm is included which disables a link for priv->conf.loopTimeout
48 * seconds when a host is seen to have jumped from one link to
49 * another within priv->conf.minStableAge seconds.
50 *
51 * We keep a hashtable that maps Ethernet addresses to host info,
52 * which is contained in struct ng_bridge_host's. These structures
53 * tell us on which link the host may be found. A host's entry will
54 * expire after priv->conf.maxStaleness seconds.
55 *
56 * This node is optimzed for stable networks, where machines jump
57 * from one port to the other only rarely.
58 */
59
60#include <sys/param.h>
61#include <sys/systm.h>
62#include <sys/kernel.h>
63#include <sys/malloc.h>
64#include <sys/mbuf.h>
65#include <sys/errno.h>
66#include <sys/syslog.h>
67#include <sys/socket.h>
68#include <sys/ctype.h>
69
70#include <net/if.h>
71#include <net/ethernet.h>
72
73#include <netinet/in.h>
74#include <netinet/ip_fw.h>
75
76#include <netgraph/ng_message.h>
77#include <netgraph/netgraph.h>
78#include <netgraph/ng_parse.h>
79#include <netgraph/ng_bridge.h>
80#include <netgraph/ng_ether.h>
81
82#ifdef NG_SEPARATE_MALLOC
83MALLOC_DEFINE(M_NETGRAPH_BRIDGE, "netgraph_bridge", "netgraph bridge node ");
84#else
85#define M_NETGRAPH_BRIDGE M_NETGRAPH
86#endif
87
88/* Per-link private data */
89struct ng_bridge_link {
90 hook_p hook; /* netgraph hook */
91 u_int16_t loopCount; /* loop ignore timer */
92 struct ng_bridge_link_stats stats; /* link stats */
93};
94
95/* Per-node private data */
96struct ng_bridge_private {
97 struct ng_bridge_bucket *tab; /* hash table bucket array */
98 struct ng_bridge_link *links[NG_BRIDGE_MAX_LINKS];
99 struct ng_bridge_config conf; /* node configuration */
100 node_p node; /* netgraph node */
101 u_int numHosts; /* num entries in table */
102 u_int numBuckets; /* num buckets in table */
103 u_int hashMask; /* numBuckets - 1 */
104 int numLinks; /* num connected links */
105 struct callout timer; /* one second periodic timer */
106};
107typedef struct ng_bridge_private *priv_p;
108
109/* Information about a host, stored in a hash table entry */
110struct ng_bridge_hent {
111 struct ng_bridge_host host; /* actual host info */
112 SLIST_ENTRY(ng_bridge_hent) next; /* next entry in bucket */
113};
114
115/* Hash table bucket declaration */
116SLIST_HEAD(ng_bridge_bucket, ng_bridge_hent);
117
118/* Netgraph node methods */
119static ng_constructor_t ng_bridge_constructor;
120static ng_rcvmsg_t ng_bridge_rcvmsg;
121static ng_shutdown_t ng_bridge_shutdown;
122static ng_newhook_t ng_bridge_newhook;
123static ng_rcvdata_t ng_bridge_rcvdata;
124static ng_disconnect_t ng_bridge_disconnect;
125
126/* Other internal functions */
127static struct ng_bridge_host *ng_bridge_get(priv_p priv, const u_char *addr);
128static int ng_bridge_put(priv_p priv, const u_char *addr, int linkNum);
129static void ng_bridge_rehash(priv_p priv);
130static void ng_bridge_remove_hosts(priv_p priv, int linkNum);
131static void ng_bridge_timeout(void *arg);
132static const char *ng_bridge_nodename(node_p node);
133
134/* Ethernet broadcast */
135static const u_char ng_bridge_bcast_addr[ETHER_ADDR_LEN] =
136 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
137
138/* Store each hook's link number in the private field */
139#define LINK_NUM(hook) (*(u_int16_t *)(&(hook)->private))
140
141/* Compare Ethernet addresses using 32 and 16 bit words instead of bytewise */
142#define ETHER_EQUAL(a,b) (((const u_int32_t *)(a))[0] \
143 == ((const u_int32_t *)(b))[0] \
144 && ((const u_int16_t *)(a))[2] \
145 == ((const u_int16_t *)(b))[2])
146
147/* Minimum and maximum number of hash buckets. Must be a power of two. */
148#define MIN_BUCKETS (1 << 5) /* 32 */
149#define MAX_BUCKETS (1 << 14) /* 16384 */
150
151/* Configuration default values */
152#define DEFAULT_LOOP_TIMEOUT 60
153#define DEFAULT_MAX_STALENESS (15 * 60) /* same as ARP timeout */
154#define DEFAULT_MIN_STABLE_AGE 1
155
156/******************************************************************
157 NETGRAPH PARSE TYPES
158******************************************************************/
159
160/*
161 * How to determine the length of the table returned by NGM_BRIDGE_GET_TABLE
162 */
163static int
164ng_bridge_getTableLength(const struct ng_parse_type *type,
165 const u_char *start, const u_char *buf)
166{
167 const struct ng_bridge_host_ary *const hary
168 = (const struct ng_bridge_host_ary *)(buf - sizeof(u_int32_t));
169
170 return hary->numHosts;
171}
172
173/* Parse type for struct ng_bridge_host_ary */
174static const struct ng_parse_struct_field ng_bridge_host_type_fields[]
80
81#ifdef NG_SEPARATE_MALLOC
82MALLOC_DEFINE(M_NETGRAPH_BRIDGE, "netgraph_bridge", "netgraph bridge node ");
83#else
84#define M_NETGRAPH_BRIDGE M_NETGRAPH
85#endif
86
87/* Per-link private data */
88struct ng_bridge_link {
89 hook_p hook; /* netgraph hook */
90 u_int16_t loopCount; /* loop ignore timer */
91 struct ng_bridge_link_stats stats; /* link stats */
92};
93
94/* Per-node private data */
95struct ng_bridge_private {
96 struct ng_bridge_bucket *tab; /* hash table bucket array */
97 struct ng_bridge_link *links[NG_BRIDGE_MAX_LINKS];
98 struct ng_bridge_config conf; /* node configuration */
99 node_p node; /* netgraph node */
100 u_int numHosts; /* num entries in table */
101 u_int numBuckets; /* num buckets in table */
102 u_int hashMask; /* numBuckets - 1 */
103 int numLinks; /* num connected links */
104 struct callout timer; /* one second periodic timer */
105};
106typedef struct ng_bridge_private *priv_p;
107
108/* Information about a host, stored in a hash table entry */
109struct ng_bridge_hent {
110 struct ng_bridge_host host; /* actual host info */
111 SLIST_ENTRY(ng_bridge_hent) next; /* next entry in bucket */
112};
113
114/* Hash table bucket declaration */
115SLIST_HEAD(ng_bridge_bucket, ng_bridge_hent);
116
117/* Netgraph node methods */
118static ng_constructor_t ng_bridge_constructor;
119static ng_rcvmsg_t ng_bridge_rcvmsg;
120static ng_shutdown_t ng_bridge_shutdown;
121static ng_newhook_t ng_bridge_newhook;
122static ng_rcvdata_t ng_bridge_rcvdata;
123static ng_disconnect_t ng_bridge_disconnect;
124
125/* Other internal functions */
126static struct ng_bridge_host *ng_bridge_get(priv_p priv, const u_char *addr);
127static int ng_bridge_put(priv_p priv, const u_char *addr, int linkNum);
128static void ng_bridge_rehash(priv_p priv);
129static void ng_bridge_remove_hosts(priv_p priv, int linkNum);
130static void ng_bridge_timeout(void *arg);
131static const char *ng_bridge_nodename(node_p node);
132
133/* Ethernet broadcast */
134static const u_char ng_bridge_bcast_addr[ETHER_ADDR_LEN] =
135 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
136
137/* Store each hook's link number in the private field */
138#define LINK_NUM(hook) (*(u_int16_t *)(&(hook)->private))
139
140/* Compare Ethernet addresses using 32 and 16 bit words instead of bytewise */
141#define ETHER_EQUAL(a,b) (((const u_int32_t *)(a))[0] \
142 == ((const u_int32_t *)(b))[0] \
143 && ((const u_int16_t *)(a))[2] \
144 == ((const u_int16_t *)(b))[2])
145
146/* Minimum and maximum number of hash buckets. Must be a power of two. */
147#define MIN_BUCKETS (1 << 5) /* 32 */
148#define MAX_BUCKETS (1 << 14) /* 16384 */
149
150/* Configuration default values */
151#define DEFAULT_LOOP_TIMEOUT 60
152#define DEFAULT_MAX_STALENESS (15 * 60) /* same as ARP timeout */
153#define DEFAULT_MIN_STABLE_AGE 1
154
155/******************************************************************
156 NETGRAPH PARSE TYPES
157******************************************************************/
158
159/*
160 * How to determine the length of the table returned by NGM_BRIDGE_GET_TABLE
161 */
162static int
163ng_bridge_getTableLength(const struct ng_parse_type *type,
164 const u_char *start, const u_char *buf)
165{
166 const struct ng_bridge_host_ary *const hary
167 = (const struct ng_bridge_host_ary *)(buf - sizeof(u_int32_t));
168
169 return hary->numHosts;
170}
171
172/* Parse type for struct ng_bridge_host_ary */
173static const struct ng_parse_struct_field ng_bridge_host_type_fields[]
175 = NG_BRIDGE_HOST_TYPE_INFO(&ng_ether_enaddr_type);
174 = NG_BRIDGE_HOST_TYPE_INFO(&ng_parse_enaddr_type);
176static const struct ng_parse_type ng_bridge_host_type = {
177 &ng_parse_struct_type,
178 &ng_bridge_host_type_fields
179};
180static const struct ng_parse_array_info ng_bridge_hary_type_info = {
181 &ng_bridge_host_type,
182 ng_bridge_getTableLength
183};
184static const struct ng_parse_type ng_bridge_hary_type = {
185 &ng_parse_array_type,
186 &ng_bridge_hary_type_info
187};
188static const struct ng_parse_struct_field ng_bridge_host_ary_type_fields[]
189 = NG_BRIDGE_HOST_ARY_TYPE_INFO(&ng_bridge_hary_type);
190static const struct ng_parse_type ng_bridge_host_ary_type = {
191 &ng_parse_struct_type,
192 &ng_bridge_host_ary_type_fields
193};
194
195/* Parse type for struct ng_bridge_config */
196static const struct ng_parse_fixedarray_info ng_bridge_ipfwary_type_info = {
197 &ng_parse_uint8_type,
198 NG_BRIDGE_MAX_LINKS
199};
200static const struct ng_parse_type ng_bridge_ipfwary_type = {
201 &ng_parse_fixedarray_type,
202 &ng_bridge_ipfwary_type_info
203};
204static const struct ng_parse_struct_field ng_bridge_config_type_fields[]
205 = NG_BRIDGE_CONFIG_TYPE_INFO(&ng_bridge_ipfwary_type);
206static const struct ng_parse_type ng_bridge_config_type = {
207 &ng_parse_struct_type,
208 &ng_bridge_config_type_fields
209};
210
211/* Parse type for struct ng_bridge_link_stat */
212static const struct ng_parse_struct_field ng_bridge_stats_type_fields[]
213 = NG_BRIDGE_STATS_TYPE_INFO;
214static const struct ng_parse_type ng_bridge_stats_type = {
215 &ng_parse_struct_type,
216 &ng_bridge_stats_type_fields
217};
218
219/* List of commands and how to convert arguments to/from ASCII */
220static const struct ng_cmdlist ng_bridge_cmdlist[] = {
221 {
222 NGM_BRIDGE_COOKIE,
223 NGM_BRIDGE_SET_CONFIG,
224 "setconfig",
225 &ng_bridge_config_type,
226 NULL
227 },
228 {
229 NGM_BRIDGE_COOKIE,
230 NGM_BRIDGE_GET_CONFIG,
231 "getconfig",
232 NULL,
233 &ng_bridge_config_type
234 },
235 {
236 NGM_BRIDGE_COOKIE,
237 NGM_BRIDGE_RESET,
238 "reset",
239 NULL,
240 NULL
241 },
242 {
243 NGM_BRIDGE_COOKIE,
244 NGM_BRIDGE_GET_STATS,
245 "getstats",
246 &ng_parse_uint32_type,
247 &ng_bridge_stats_type
248 },
249 {
250 NGM_BRIDGE_COOKIE,
251 NGM_BRIDGE_CLR_STATS,
252 "clrstats",
253 &ng_parse_uint32_type,
254 NULL
255 },
256 {
257 NGM_BRIDGE_COOKIE,
258 NGM_BRIDGE_GETCLR_STATS,
259 "getclrstats",
260 &ng_parse_uint32_type,
261 &ng_bridge_stats_type
262 },
263 {
264 NGM_BRIDGE_COOKIE,
265 NGM_BRIDGE_GET_TABLE,
266 "gettable",
267 NULL,
268 &ng_bridge_host_ary_type
269 },
270 { 0 }
271};
272
273/* Node type descriptor */
274static struct ng_type ng_bridge_typestruct = {
275 NG_ABI_VERSION,
276 NG_BRIDGE_NODE_TYPE,
277 NULL,
278 ng_bridge_constructor,
279 ng_bridge_rcvmsg,
280 ng_bridge_shutdown,
281 ng_bridge_newhook,
282 NULL,
283 NULL,
284 ng_bridge_rcvdata,
285 ng_bridge_disconnect,
286 ng_bridge_cmdlist,
287};
288NETGRAPH_INIT(bridge, &ng_bridge_typestruct);
289
175static const struct ng_parse_type ng_bridge_host_type = {
176 &ng_parse_struct_type,
177 &ng_bridge_host_type_fields
178};
179static const struct ng_parse_array_info ng_bridge_hary_type_info = {
180 &ng_bridge_host_type,
181 ng_bridge_getTableLength
182};
183static const struct ng_parse_type ng_bridge_hary_type = {
184 &ng_parse_array_type,
185 &ng_bridge_hary_type_info
186};
187static const struct ng_parse_struct_field ng_bridge_host_ary_type_fields[]
188 = NG_BRIDGE_HOST_ARY_TYPE_INFO(&ng_bridge_hary_type);
189static const struct ng_parse_type ng_bridge_host_ary_type = {
190 &ng_parse_struct_type,
191 &ng_bridge_host_ary_type_fields
192};
193
194/* Parse type for struct ng_bridge_config */
195static const struct ng_parse_fixedarray_info ng_bridge_ipfwary_type_info = {
196 &ng_parse_uint8_type,
197 NG_BRIDGE_MAX_LINKS
198};
199static const struct ng_parse_type ng_bridge_ipfwary_type = {
200 &ng_parse_fixedarray_type,
201 &ng_bridge_ipfwary_type_info
202};
203static const struct ng_parse_struct_field ng_bridge_config_type_fields[]
204 = NG_BRIDGE_CONFIG_TYPE_INFO(&ng_bridge_ipfwary_type);
205static const struct ng_parse_type ng_bridge_config_type = {
206 &ng_parse_struct_type,
207 &ng_bridge_config_type_fields
208};
209
210/* Parse type for struct ng_bridge_link_stat */
211static const struct ng_parse_struct_field ng_bridge_stats_type_fields[]
212 = NG_BRIDGE_STATS_TYPE_INFO;
213static const struct ng_parse_type ng_bridge_stats_type = {
214 &ng_parse_struct_type,
215 &ng_bridge_stats_type_fields
216};
217
218/* List of commands and how to convert arguments to/from ASCII */
219static const struct ng_cmdlist ng_bridge_cmdlist[] = {
220 {
221 NGM_BRIDGE_COOKIE,
222 NGM_BRIDGE_SET_CONFIG,
223 "setconfig",
224 &ng_bridge_config_type,
225 NULL
226 },
227 {
228 NGM_BRIDGE_COOKIE,
229 NGM_BRIDGE_GET_CONFIG,
230 "getconfig",
231 NULL,
232 &ng_bridge_config_type
233 },
234 {
235 NGM_BRIDGE_COOKIE,
236 NGM_BRIDGE_RESET,
237 "reset",
238 NULL,
239 NULL
240 },
241 {
242 NGM_BRIDGE_COOKIE,
243 NGM_BRIDGE_GET_STATS,
244 "getstats",
245 &ng_parse_uint32_type,
246 &ng_bridge_stats_type
247 },
248 {
249 NGM_BRIDGE_COOKIE,
250 NGM_BRIDGE_CLR_STATS,
251 "clrstats",
252 &ng_parse_uint32_type,
253 NULL
254 },
255 {
256 NGM_BRIDGE_COOKIE,
257 NGM_BRIDGE_GETCLR_STATS,
258 "getclrstats",
259 &ng_parse_uint32_type,
260 &ng_bridge_stats_type
261 },
262 {
263 NGM_BRIDGE_COOKIE,
264 NGM_BRIDGE_GET_TABLE,
265 "gettable",
266 NULL,
267 &ng_bridge_host_ary_type
268 },
269 { 0 }
270};
271
272/* Node type descriptor */
273static struct ng_type ng_bridge_typestruct = {
274 NG_ABI_VERSION,
275 NG_BRIDGE_NODE_TYPE,
276 NULL,
277 ng_bridge_constructor,
278 ng_bridge_rcvmsg,
279 ng_bridge_shutdown,
280 ng_bridge_newhook,
281 NULL,
282 NULL,
283 ng_bridge_rcvdata,
284 ng_bridge_disconnect,
285 ng_bridge_cmdlist,
286};
287NETGRAPH_INIT(bridge, &ng_bridge_typestruct);
288
290/* Depend on ng_ether so we can use the Ethernet parse type */
291MODULE_DEPEND(ng_bridge, ng_ether, 1, 1, 1);
292
293/******************************************************************
294 NETGRAPH NODE METHODS
295******************************************************************/
296
297/*
298 * Node constructor
299 */
300static int
301ng_bridge_constructor(node_p node)
302{
303 priv_p priv;
304
305 /* Allocate and initialize private info */
306 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH_BRIDGE, M_NOWAIT | M_ZERO);
307 if (priv == NULL)
308 return (ENOMEM);
309 callout_init(&priv->timer, 0);
310
311 /* Allocate and initialize hash table, etc. */
312 MALLOC(priv->tab, struct ng_bridge_bucket *,
313 MIN_BUCKETS * sizeof(*priv->tab), M_NETGRAPH_BRIDGE, M_NOWAIT | M_ZERO);
314 if (priv->tab == NULL) {
315 FREE(priv, M_NETGRAPH_BRIDGE);
316 return (ENOMEM);
317 }
318 priv->numBuckets = MIN_BUCKETS;
319 priv->hashMask = MIN_BUCKETS - 1;
320 priv->conf.debugLevel = 1;
321 priv->conf.loopTimeout = DEFAULT_LOOP_TIMEOUT;
322 priv->conf.maxStaleness = DEFAULT_MAX_STALENESS;
323 priv->conf.minStableAge = DEFAULT_MIN_STABLE_AGE;
324
325 /*
326 * This node has all kinds of stuff that could be screwed by SMP.
327 * Until it gets it's own internal protection, we go through in
328 * single file. This could hurt a machine bridging beteen two
329 * GB ethernets so it should be fixed.
330 * When it's fixed the process SHOULD NOT SLEEP, spinlocks please!
331 * (and atomic ops )
332 */
333 NG_NODE_FORCE_WRITER(node);
334 NG_NODE_SET_PRIVATE(node, priv);
335 priv->node = node;
336
337 /* Start timer; timer is always running while node is alive */
338 callout_reset(&priv->timer, hz, ng_bridge_timeout, priv->node);
339
340 /* Done */
341 return (0);
342}
343
344/*
345 * Method for attaching a new hook
346 */
347static int
348ng_bridge_newhook(node_p node, hook_p hook, const char *name)
349{
350 const priv_p priv = NG_NODE_PRIVATE(node);
351
352 /* Check for a link hook */
353 if (strncmp(name, NG_BRIDGE_HOOK_LINK_PREFIX,
354 strlen(NG_BRIDGE_HOOK_LINK_PREFIX)) == 0) {
355 const char *cp;
356 char *eptr;
357 u_long linkNum;
358
359 cp = name + strlen(NG_BRIDGE_HOOK_LINK_PREFIX);
360 if (!isdigit(*cp) || (cp[0] == '0' && cp[1] != '\0'))
361 return (EINVAL);
362 linkNum = strtoul(cp, &eptr, 10);
363 if (*eptr != '\0' || linkNum >= NG_BRIDGE_MAX_LINKS)
364 return (EINVAL);
365 if (priv->links[linkNum] != NULL)
366 return (EISCONN);
367 MALLOC(priv->links[linkNum], struct ng_bridge_link *,
368 sizeof(*priv->links[linkNum]), M_NETGRAPH_BRIDGE, M_NOWAIT|M_ZERO);
369 if (priv->links[linkNum] == NULL)
370 return (ENOMEM);
371 priv->links[linkNum]->hook = hook;
372 NG_HOOK_SET_PRIVATE(hook, (void *)linkNum);
373 priv->numLinks++;
374 return (0);
375 }
376
377 /* Unknown hook name */
378 return (EINVAL);
379}
380
381/*
382 * Receive a control message
383 */
384static int
385ng_bridge_rcvmsg(node_p node, item_p item, hook_p lasthook)
386{
387 const priv_p priv = NG_NODE_PRIVATE(node);
388 struct ng_mesg *resp = NULL;
389 int error = 0;
390 struct ng_mesg *msg;
391
392 NGI_GET_MSG(item, msg);
393 switch (msg->header.typecookie) {
394 case NGM_BRIDGE_COOKIE:
395 switch (msg->header.cmd) {
396 case NGM_BRIDGE_GET_CONFIG:
397 {
398 struct ng_bridge_config *conf;
399
400 NG_MKRESPONSE(resp, msg,
401 sizeof(struct ng_bridge_config), M_NOWAIT);
402 if (resp == NULL) {
403 error = ENOMEM;
404 break;
405 }
406 conf = (struct ng_bridge_config *)resp->data;
407 *conf = priv->conf; /* no sanity checking needed */
408 break;
409 }
410 case NGM_BRIDGE_SET_CONFIG:
411 {
412 struct ng_bridge_config *conf;
413 int i;
414
415 if (msg->header.arglen
416 != sizeof(struct ng_bridge_config)) {
417 error = EINVAL;
418 break;
419 }
420 conf = (struct ng_bridge_config *)msg->data;
421 priv->conf = *conf;
422 for (i = 0; i < NG_BRIDGE_MAX_LINKS; i++)
423 priv->conf.ipfw[i] = !!priv->conf.ipfw[i];
424 break;
425 }
426 case NGM_BRIDGE_RESET:
427 {
428 int i;
429
430 /* Flush all entries in the hash table */
431 ng_bridge_remove_hosts(priv, -1);
432
433 /* Reset all loop detection counters and stats */
434 for (i = 0; i < NG_BRIDGE_MAX_LINKS; i++) {
435 if (priv->links[i] == NULL)
436 continue;
437 priv->links[i]->loopCount = 0;
438 bzero(&priv->links[i]->stats,
439 sizeof(priv->links[i]->stats));
440 }
441 break;
442 }
443 case NGM_BRIDGE_GET_STATS:
444 case NGM_BRIDGE_CLR_STATS:
445 case NGM_BRIDGE_GETCLR_STATS:
446 {
447 struct ng_bridge_link *link;
448 int linkNum;
449
450 /* Get link number */
451 if (msg->header.arglen != sizeof(u_int32_t)) {
452 error = EINVAL;
453 break;
454 }
455 linkNum = *((u_int32_t *)msg->data);
456 if (linkNum < 0 || linkNum >= NG_BRIDGE_MAX_LINKS) {
457 error = EINVAL;
458 break;
459 }
460 if ((link = priv->links[linkNum]) == NULL) {
461 error = ENOTCONN;
462 break;
463 }
464
465 /* Get/clear stats */
466 if (msg->header.cmd != NGM_BRIDGE_CLR_STATS) {
467 NG_MKRESPONSE(resp, msg,
468 sizeof(link->stats), M_NOWAIT);
469 if (resp == NULL) {
470 error = ENOMEM;
471 break;
472 }
473 bcopy(&link->stats,
474 resp->data, sizeof(link->stats));
475 }
476 if (msg->header.cmd != NGM_BRIDGE_GET_STATS)
477 bzero(&link->stats, sizeof(link->stats));
478 break;
479 }
480 case NGM_BRIDGE_GET_TABLE:
481 {
482 struct ng_bridge_host_ary *ary;
483 struct ng_bridge_hent *hent;
484 int i = 0, bucket;
485
486 NG_MKRESPONSE(resp, msg, sizeof(*ary)
487 + (priv->numHosts * sizeof(*ary->hosts)), M_NOWAIT);
488 if (resp == NULL) {
489 error = ENOMEM;
490 break;
491 }
492 ary = (struct ng_bridge_host_ary *)resp->data;
493 ary->numHosts = priv->numHosts;
494 for (bucket = 0; bucket < priv->numBuckets; bucket++) {
495 SLIST_FOREACH(hent, &priv->tab[bucket], next)
496 ary->hosts[i++] = hent->host;
497 }
498 break;
499 }
500 default:
501 error = EINVAL;
502 break;
503 }
504 break;
505 default:
506 error = EINVAL;
507 break;
508 }
509
510 /* Done */
511 NG_RESPOND_MSG(error, node, item, resp);
512 NG_FREE_MSG(msg);
513 return (error);
514}
515
516/*
517 * Receive data on a hook
518 */
519static int
520ng_bridge_rcvdata(hook_p hook, item_p item)
521{
522 const node_p node = NG_HOOK_NODE(hook);
523 const priv_p priv = NG_NODE_PRIVATE(node);
524 struct ng_bridge_host *host;
525 struct ng_bridge_link *link;
526 struct ether_header *eh;
527 int error = 0, linkNum;
528 int manycast;
529 struct mbuf *m;
530 meta_p meta;
531 struct ng_bridge_link *firstLink;
532
533 NGI_GET_M(item, m);
534 /* Get link number */
535 linkNum = (intptr_t)NG_HOOK_PRIVATE(hook);
536 KASSERT(linkNum >= 0 && linkNum < NG_BRIDGE_MAX_LINKS,
537 ("%s: linkNum=%u", __func__, linkNum));
538 link = priv->links[linkNum];
539 KASSERT(link != NULL, ("%s: link%d null", __func__, linkNum));
540
541 /* Sanity check packet and pull up header */
542 if (m->m_pkthdr.len < ETHER_HDR_LEN) {
543 link->stats.recvRunts++;
544 NG_FREE_ITEM(item);
545 NG_FREE_M(m);
546 return (EINVAL);
547 }
548 if (m->m_len < ETHER_HDR_LEN && !(m = m_pullup(m, ETHER_HDR_LEN))) {
549 link->stats.memoryFailures++;
550 NG_FREE_ITEM(item);
551 return (ENOBUFS);
552 }
553 eh = mtod(m, struct ether_header *);
554 if ((eh->ether_shost[0] & 1) != 0) {
555 link->stats.recvInvalid++;
556 NG_FREE_ITEM(item);
557 NG_FREE_M(m);
558 return (EINVAL);
559 }
560
561 /* Is link disabled due to a loopback condition? */
562 if (link->loopCount != 0) {
563 link->stats.loopDrops++;
564 NG_FREE_ITEM(item);
565 NG_FREE_M(m);
566 return (ELOOP); /* XXX is this an appropriate error? */
567 }
568
569 /* Update stats */
570 link->stats.recvPackets++;
571 link->stats.recvOctets += m->m_pkthdr.len;
572 if ((manycast = (eh->ether_dhost[0] & 1)) != 0) {
573 if (ETHER_EQUAL(eh->ether_dhost, ng_bridge_bcast_addr)) {
574 link->stats.recvBroadcasts++;
575 manycast = 2;
576 } else
577 link->stats.recvMulticasts++;
578 }
579
580 /* Look up packet's source Ethernet address in hashtable */
581 if ((host = ng_bridge_get(priv, eh->ether_shost)) != NULL) {
582
583 /* Update time since last heard from this host */
584 host->staleness = 0;
585
586 /* Did host jump to a different link? */
587 if (host->linkNum != linkNum) {
588
589 /*
590 * If the host's old link was recently established
591 * on the old link and it's already jumped to a new
592 * link, declare a loopback condition.
593 */
594 if (host->age < priv->conf.minStableAge) {
595
596 /* Log the problem */
597 if (priv->conf.debugLevel >= 2) {
598 struct ifnet *ifp = m->m_pkthdr.rcvif;
599 char suffix[32];
600
601 if (ifp != NULL)
602 snprintf(suffix, sizeof(suffix),
603 " (%s)", ifp->if_xname);
604 else
605 *suffix = '\0';
606 log(LOG_WARNING, "ng_bridge: %s:"
607 " loopback detected on %s%s\n",
608 ng_bridge_nodename(node),
609 NG_HOOK_NAME(hook), suffix);
610 }
611
612 /* Mark link as linka non grata */
613 link->loopCount = priv->conf.loopTimeout;
614 link->stats.loopDetects++;
615
616 /* Forget all hosts on this link */
617 ng_bridge_remove_hosts(priv, linkNum);
618
619 /* Drop packet */
620 link->stats.loopDrops++;
621 NG_FREE_ITEM(item);
622 NG_FREE_M(m);
623 return (ELOOP); /* XXX appropriate? */
624 }
625
626 /* Move host over to new link */
627 host->linkNum = linkNum;
628 host->age = 0;
629 }
630 } else {
631 if (!ng_bridge_put(priv, eh->ether_shost, linkNum)) {
632 link->stats.memoryFailures++;
633 NG_FREE_ITEM(item);
634 NG_FREE_M(m);
635 return (ENOMEM);
636 }
637 }
638
639 /* Run packet through ipfw processing, if enabled */
640 if (priv->conf.ipfw[linkNum] && fw_enable && ip_fw_chk_ptr != NULL) {
641 /* XXX not implemented yet */
642 }
643
644 /*
645 * If unicast and destination host known, deliver to host's link,
646 * unless it is the same link as the packet came in on.
647 */
648 if (!manycast) {
649
650 /* Determine packet destination link */
651 if ((host = ng_bridge_get(priv, eh->ether_dhost)) != NULL) {
652 struct ng_bridge_link *const destLink
653 = priv->links[host->linkNum];
654
655 /* If destination same as incoming link, do nothing */
656 KASSERT(destLink != NULL,
657 ("%s: link%d null", __func__, host->linkNum));
658 if (destLink == link) {
659 NG_FREE_ITEM(item);
660 NG_FREE_M(m);
661 return (0);
662 }
663
664 /* Deliver packet out the destination link */
665 destLink->stats.xmitPackets++;
666 destLink->stats.xmitOctets += m->m_pkthdr.len;
667 NG_FWD_NEW_DATA(error, item, destLink->hook, m);
668 return (error);
669 }
670
671 /* Destination host is not known */
672 link->stats.recvUnknown++;
673 }
674
675 /* Distribute unknown, multicast, broadcast pkts to all other links */
676 meta = NGI_META(item); /* peek.. */
677 firstLink = NULL;
678 for (linkNum = 0; linkNum <= priv->numLinks; linkNum++) {
679 struct ng_bridge_link *destLink;
680 meta_p meta2 = NULL;
681 struct mbuf *m2 = NULL;
682
683 /*
684 * If we have checked all the links then now
685 * send the original on its reserved link
686 */
687 if (linkNum == priv->numLinks) {
688 /* If we never saw a good link, leave. */
689 if (firstLink == NULL) {
690 NG_FREE_ITEM(item);
691 NG_FREE_M(m);
692 return (0);
693 }
694 destLink = firstLink;
695 } else {
696 destLink = priv->links[linkNum];
697 /* Skip incoming link and disconnected links */
698 if (destLink == NULL || destLink == link) {
699 continue;
700 }
701 if (firstLink == NULL) {
702 /*
703 * This is the first usable link we have found.
704 * Reserve it for the originals.
705 * If we never find another we save a copy.
706 */
707 firstLink = destLink;
708 continue;
709 }
710
711 /*
712 * It's usable link but not the reserved (first) one.
713 * Copy mbuf and meta info for sending.
714 */
715 m2 = m_dup(m, M_DONTWAIT); /* XXX m_copypacket() */
716 if (m2 == NULL) {
717 link->stats.memoryFailures++;
718 NG_FREE_ITEM(item);
719 NG_FREE_M(m);
720 return (ENOBUFS);
721 }
722 if (meta != NULL
723 && (meta2 = ng_copy_meta(meta)) == NULL) {
724 link->stats.memoryFailures++;
725 m_freem(m2);
726 NG_FREE_ITEM(item);
727 NG_FREE_M(m);
728 return (ENOMEM);
729 }
730 }
731
732 /* Update stats */
733 destLink->stats.xmitPackets++;
734 destLink->stats.xmitOctets += m->m_pkthdr.len;
735 switch (manycast) {
736 case 0: /* unicast */
737 break;
738 case 1: /* multicast */
739 destLink->stats.xmitMulticasts++;
740 break;
741 case 2: /* broadcast */
742 destLink->stats.xmitBroadcasts++;
743 break;
744 }
745
746 /* Send packet */
747 if (destLink == firstLink) {
748 /*
749 * If we've sent all the others, send the original
750 * on the first link we found.
751 */
752 NG_FWD_NEW_DATA(error, item, destLink->hook, m);
753 break; /* always done last - not really needed. */
754 } else {
755 NG_SEND_DATA(error, destLink->hook, m2, meta2);
756 }
757 }
758 return (error);
759}
760
761/*
762 * Shutdown node
763 */
764static int
765ng_bridge_shutdown(node_p node)
766{
767 const priv_p priv = NG_NODE_PRIVATE(node);
768
769 /*
770 * Shut down everything except the timer. There's no way to
771 * avoid another possible timeout event (it may have already
772 * been dequeued), so we can't free the node yet.
773 */
774 KASSERT(priv->numLinks == 0 && priv->numHosts == 0,
775 ("%s: numLinks=%d numHosts=%d",
776 __func__, priv->numLinks, priv->numHosts));
777 FREE(priv->tab, M_NETGRAPH_BRIDGE);
778
779 /* NG_INVALID flag is now set so node will be freed at next timeout */
780 return (0);
781}
782
783/*
784 * Hook disconnection.
785 */
786static int
787ng_bridge_disconnect(hook_p hook)
788{
789 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
790 int linkNum;
791
792 /* Get link number */
793 linkNum = (intptr_t)NG_HOOK_PRIVATE(hook);
794 KASSERT(linkNum >= 0 && linkNum < NG_BRIDGE_MAX_LINKS,
795 ("%s: linkNum=%u", __func__, linkNum));
796
797 /* Remove all hosts associated with this link */
798 ng_bridge_remove_hosts(priv, linkNum);
799
800 /* Free associated link information */
801 KASSERT(priv->links[linkNum] != NULL, ("%s: no link", __func__));
802 FREE(priv->links[linkNum], M_NETGRAPH_BRIDGE);
803 priv->links[linkNum] = NULL;
804 priv->numLinks--;
805
806 /* If no more hooks, go away */
807 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
808 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
809 ng_rmnode_self(NG_HOOK_NODE(hook));
810 }
811 return (0);
812}
813
814/******************************************************************
815 HASH TABLE FUNCTIONS
816******************************************************************/
817
818/*
819 * Hash algorithm
820 *
821 * Only hashing bytes 3-6 of the Ethernet address is sufficient and fast.
822 */
823#define HASH(addr,mask) ( (((const u_int16_t *)(addr))[0] \
824 ^ ((const u_int16_t *)(addr))[1] \
825 ^ ((const u_int16_t *)(addr))[2]) & (mask) )
826
827/*
828 * Find a host entry in the table.
829 */
830static struct ng_bridge_host *
831ng_bridge_get(priv_p priv, const u_char *addr)
832{
833 const int bucket = HASH(addr, priv->hashMask);
834 struct ng_bridge_hent *hent;
835
836 SLIST_FOREACH(hent, &priv->tab[bucket], next) {
837 if (ETHER_EQUAL(hent->host.addr, addr))
838 return (&hent->host);
839 }
840 return (NULL);
841}
842
843/*
844 * Add a new host entry to the table. This assumes the host doesn't
845 * already exist in the table. Returns 1 on success, 0 if there
846 * was a memory allocation failure.
847 */
848static int
849ng_bridge_put(priv_p priv, const u_char *addr, int linkNum)
850{
851 const int bucket = HASH(addr, priv->hashMask);
852 struct ng_bridge_hent *hent;
853
854#ifdef INVARIANTS
855 /* Assert that entry does not already exist in hashtable */
856 SLIST_FOREACH(hent, &priv->tab[bucket], next) {
857 KASSERT(!ETHER_EQUAL(hent->host.addr, addr),
858 ("%s: entry %6D exists in table", __func__, addr, ":"));
859 }
860#endif
861
862 /* Allocate and initialize new hashtable entry */
863 MALLOC(hent, struct ng_bridge_hent *,
864 sizeof(*hent), M_NETGRAPH_BRIDGE, M_NOWAIT);
865 if (hent == NULL)
866 return (0);
867 bcopy(addr, hent->host.addr, ETHER_ADDR_LEN);
868 hent->host.linkNum = linkNum;
869 hent->host.staleness = 0;
870 hent->host.age = 0;
871
872 /* Add new element to hash bucket */
873 SLIST_INSERT_HEAD(&priv->tab[bucket], hent, next);
874 priv->numHosts++;
875
876 /* Resize table if necessary */
877 ng_bridge_rehash(priv);
878 return (1);
879}
880
881/*
882 * Resize the hash table. We try to maintain the number of buckets
883 * such that the load factor is in the range 0.25 to 1.0.
884 *
885 * If we can't get the new memory then we silently fail. This is OK
886 * because things will still work and we'll try again soon anyway.
887 */
888static void
889ng_bridge_rehash(priv_p priv)
890{
891 struct ng_bridge_bucket *newTab;
892 int oldBucket, newBucket;
893 int newNumBuckets;
894 u_int newMask;
895
896 /* Is table too full or too empty? */
897 if (priv->numHosts > priv->numBuckets
898 && (priv->numBuckets << 1) <= MAX_BUCKETS)
899 newNumBuckets = priv->numBuckets << 1;
900 else if (priv->numHosts < (priv->numBuckets >> 2)
901 && (priv->numBuckets >> 2) >= MIN_BUCKETS)
902 newNumBuckets = priv->numBuckets >> 2;
903 else
904 return;
905 newMask = newNumBuckets - 1;
906
907 /* Allocate and initialize new table */
908 MALLOC(newTab, struct ng_bridge_bucket *,
909 newNumBuckets * sizeof(*newTab), M_NETGRAPH_BRIDGE, M_NOWAIT | M_ZERO);
910 if (newTab == NULL)
911 return;
912
913 /* Move all entries from old table to new table */
914 for (oldBucket = 0; oldBucket < priv->numBuckets; oldBucket++) {
915 struct ng_bridge_bucket *const oldList = &priv->tab[oldBucket];
916
917 while (!SLIST_EMPTY(oldList)) {
918 struct ng_bridge_hent *const hent
919 = SLIST_FIRST(oldList);
920
921 SLIST_REMOVE_HEAD(oldList, next);
922 newBucket = HASH(hent->host.addr, newMask);
923 SLIST_INSERT_HEAD(&newTab[newBucket], hent, next);
924 }
925 }
926
927 /* Replace old table with new one */
928 if (priv->conf.debugLevel >= 3) {
929 log(LOG_INFO, "ng_bridge: %s: table size %d -> %d\n",
930 ng_bridge_nodename(priv->node),
931 priv->numBuckets, newNumBuckets);
932 }
933 FREE(priv->tab, M_NETGRAPH_BRIDGE);
934 priv->numBuckets = newNumBuckets;
935 priv->hashMask = newMask;
936 priv->tab = newTab;
937 return;
938}
939
940/******************************************************************
941 MISC FUNCTIONS
942******************************************************************/
943
944/*
945 * Remove all hosts associated with a specific link from the hashtable.
946 * If linkNum == -1, then remove all hosts in the table.
947 */
948static void
949ng_bridge_remove_hosts(priv_p priv, int linkNum)
950{
951 int bucket;
952
953 for (bucket = 0; bucket < priv->numBuckets; bucket++) {
954 struct ng_bridge_hent **hptr = &SLIST_FIRST(&priv->tab[bucket]);
955
956 while (*hptr != NULL) {
957 struct ng_bridge_hent *const hent = *hptr;
958
959 if (linkNum == -1 || hent->host.linkNum == linkNum) {
960 *hptr = SLIST_NEXT(hent, next);
961 FREE(hent, M_NETGRAPH_BRIDGE);
962 priv->numHosts--;
963 } else
964 hptr = &SLIST_NEXT(hent, next);
965 }
966 }
967}
968
969/*
970 * Handle our once-per-second timeout event. We do two things:
971 * we decrement link->loopCount for those links being muted due to
972 * a detected loopback condition, and we remove any hosts from
973 * the hashtable whom we haven't heard from in a long while.
974 *
975 * If the node has the NG_INVALID flag set, our job is to kill it.
976 */
977static void
978ng_bridge_timeout(void *arg)
979{
980 const node_p node = arg;
981 const priv_p priv = NG_NODE_PRIVATE(node);
982 int s, bucket;
983 int counter = 0;
984 int linkNum;
985
986 /* If node was shut down, this is the final lingering timeout */
987 s = splnet();
988 if (NG_NODE_NOT_VALID(node)) {
989 FREE(priv, M_NETGRAPH_BRIDGE);
990 NG_NODE_SET_PRIVATE(node, NULL);
991 NG_NODE_UNREF(node);
992 splx(s);
993 return;
994 }
995
996 /* Register a new timeout, keeping the existing node reference */
997 callout_reset(&priv->timer, hz, ng_bridge_timeout, node);
998
999 /* Update host time counters and remove stale entries */
1000 for (bucket = 0; bucket < priv->numBuckets; bucket++) {
1001 struct ng_bridge_hent **hptr = &SLIST_FIRST(&priv->tab[bucket]);
1002
1003 while (*hptr != NULL) {
1004 struct ng_bridge_hent *const hent = *hptr;
1005
1006 /* Make sure host's link really exists */
1007 KASSERT(priv->links[hent->host.linkNum] != NULL,
1008 ("%s: host %6D on nonexistent link %d\n",
1009 __func__, hent->host.addr, ":",
1010 hent->host.linkNum));
1011
1012 /* Remove hosts we haven't heard from in a while */
1013 if (++hent->host.staleness >= priv->conf.maxStaleness) {
1014 *hptr = SLIST_NEXT(hent, next);
1015 FREE(hent, M_NETGRAPH_BRIDGE);
1016 priv->numHosts--;
1017 } else {
1018 if (hent->host.age < 0xffff)
1019 hent->host.age++;
1020 hptr = &SLIST_NEXT(hent, next);
1021 counter++;
1022 }
1023 }
1024 }
1025 KASSERT(priv->numHosts == counter,
1026 ("%s: hosts: %d != %d", __func__, priv->numHosts, counter));
1027
1028 /* Decrease table size if necessary */
1029 ng_bridge_rehash(priv);
1030
1031 /* Decrease loop counter on muted looped back links */
1032 for (counter = linkNum = 0; linkNum < NG_BRIDGE_MAX_LINKS; linkNum++) {
1033 struct ng_bridge_link *const link = priv->links[linkNum];
1034
1035 if (link != NULL) {
1036 if (link->loopCount != 0) {
1037 link->loopCount--;
1038 if (link->loopCount == 0
1039 && priv->conf.debugLevel >= 2) {
1040 log(LOG_INFO, "ng_bridge: %s:"
1041 " restoring looped back link%d\n",
1042 ng_bridge_nodename(node), linkNum);
1043 }
1044 }
1045 counter++;
1046 }
1047 }
1048 KASSERT(priv->numLinks == counter,
1049 ("%s: links: %d != %d", __func__, priv->numLinks, counter));
1050
1051 /* Done */
1052 splx(s);
1053}
1054
1055/*
1056 * Return node's "name", even if it doesn't have one.
1057 */
1058static const char *
1059ng_bridge_nodename(node_p node)
1060{
1061 static char name[NG_NODELEN+1];
1062
1063 if (NG_NODE_NAME(node) != NULL)
1064 snprintf(name, sizeof(name), "%s", NG_NODE_NAME(node));
1065 else
1066 snprintf(name, sizeof(name), "[%x]", ng_node2ID(node));
1067 return name;
1068}
1069
289/******************************************************************
290 NETGRAPH NODE METHODS
291******************************************************************/
292
293/*
294 * Node constructor
295 */
296static int
297ng_bridge_constructor(node_p node)
298{
299 priv_p priv;
300
301 /* Allocate and initialize private info */
302 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH_BRIDGE, M_NOWAIT | M_ZERO);
303 if (priv == NULL)
304 return (ENOMEM);
305 callout_init(&priv->timer, 0);
306
307 /* Allocate and initialize hash table, etc. */
308 MALLOC(priv->tab, struct ng_bridge_bucket *,
309 MIN_BUCKETS * sizeof(*priv->tab), M_NETGRAPH_BRIDGE, M_NOWAIT | M_ZERO);
310 if (priv->tab == NULL) {
311 FREE(priv, M_NETGRAPH_BRIDGE);
312 return (ENOMEM);
313 }
314 priv->numBuckets = MIN_BUCKETS;
315 priv->hashMask = MIN_BUCKETS - 1;
316 priv->conf.debugLevel = 1;
317 priv->conf.loopTimeout = DEFAULT_LOOP_TIMEOUT;
318 priv->conf.maxStaleness = DEFAULT_MAX_STALENESS;
319 priv->conf.minStableAge = DEFAULT_MIN_STABLE_AGE;
320
321 /*
322 * This node has all kinds of stuff that could be screwed by SMP.
323 * Until it gets it's own internal protection, we go through in
324 * single file. This could hurt a machine bridging beteen two
325 * GB ethernets so it should be fixed.
326 * When it's fixed the process SHOULD NOT SLEEP, spinlocks please!
327 * (and atomic ops )
328 */
329 NG_NODE_FORCE_WRITER(node);
330 NG_NODE_SET_PRIVATE(node, priv);
331 priv->node = node;
332
333 /* Start timer; timer is always running while node is alive */
334 callout_reset(&priv->timer, hz, ng_bridge_timeout, priv->node);
335
336 /* Done */
337 return (0);
338}
339
340/*
341 * Method for attaching a new hook
342 */
343static int
344ng_bridge_newhook(node_p node, hook_p hook, const char *name)
345{
346 const priv_p priv = NG_NODE_PRIVATE(node);
347
348 /* Check for a link hook */
349 if (strncmp(name, NG_BRIDGE_HOOK_LINK_PREFIX,
350 strlen(NG_BRIDGE_HOOK_LINK_PREFIX)) == 0) {
351 const char *cp;
352 char *eptr;
353 u_long linkNum;
354
355 cp = name + strlen(NG_BRIDGE_HOOK_LINK_PREFIX);
356 if (!isdigit(*cp) || (cp[0] == '0' && cp[1] != '\0'))
357 return (EINVAL);
358 linkNum = strtoul(cp, &eptr, 10);
359 if (*eptr != '\0' || linkNum >= NG_BRIDGE_MAX_LINKS)
360 return (EINVAL);
361 if (priv->links[linkNum] != NULL)
362 return (EISCONN);
363 MALLOC(priv->links[linkNum], struct ng_bridge_link *,
364 sizeof(*priv->links[linkNum]), M_NETGRAPH_BRIDGE, M_NOWAIT|M_ZERO);
365 if (priv->links[linkNum] == NULL)
366 return (ENOMEM);
367 priv->links[linkNum]->hook = hook;
368 NG_HOOK_SET_PRIVATE(hook, (void *)linkNum);
369 priv->numLinks++;
370 return (0);
371 }
372
373 /* Unknown hook name */
374 return (EINVAL);
375}
376
377/*
378 * Receive a control message
379 */
380static int
381ng_bridge_rcvmsg(node_p node, item_p item, hook_p lasthook)
382{
383 const priv_p priv = NG_NODE_PRIVATE(node);
384 struct ng_mesg *resp = NULL;
385 int error = 0;
386 struct ng_mesg *msg;
387
388 NGI_GET_MSG(item, msg);
389 switch (msg->header.typecookie) {
390 case NGM_BRIDGE_COOKIE:
391 switch (msg->header.cmd) {
392 case NGM_BRIDGE_GET_CONFIG:
393 {
394 struct ng_bridge_config *conf;
395
396 NG_MKRESPONSE(resp, msg,
397 sizeof(struct ng_bridge_config), M_NOWAIT);
398 if (resp == NULL) {
399 error = ENOMEM;
400 break;
401 }
402 conf = (struct ng_bridge_config *)resp->data;
403 *conf = priv->conf; /* no sanity checking needed */
404 break;
405 }
406 case NGM_BRIDGE_SET_CONFIG:
407 {
408 struct ng_bridge_config *conf;
409 int i;
410
411 if (msg->header.arglen
412 != sizeof(struct ng_bridge_config)) {
413 error = EINVAL;
414 break;
415 }
416 conf = (struct ng_bridge_config *)msg->data;
417 priv->conf = *conf;
418 for (i = 0; i < NG_BRIDGE_MAX_LINKS; i++)
419 priv->conf.ipfw[i] = !!priv->conf.ipfw[i];
420 break;
421 }
422 case NGM_BRIDGE_RESET:
423 {
424 int i;
425
426 /* Flush all entries in the hash table */
427 ng_bridge_remove_hosts(priv, -1);
428
429 /* Reset all loop detection counters and stats */
430 for (i = 0; i < NG_BRIDGE_MAX_LINKS; i++) {
431 if (priv->links[i] == NULL)
432 continue;
433 priv->links[i]->loopCount = 0;
434 bzero(&priv->links[i]->stats,
435 sizeof(priv->links[i]->stats));
436 }
437 break;
438 }
439 case NGM_BRIDGE_GET_STATS:
440 case NGM_BRIDGE_CLR_STATS:
441 case NGM_BRIDGE_GETCLR_STATS:
442 {
443 struct ng_bridge_link *link;
444 int linkNum;
445
446 /* Get link number */
447 if (msg->header.arglen != sizeof(u_int32_t)) {
448 error = EINVAL;
449 break;
450 }
451 linkNum = *((u_int32_t *)msg->data);
452 if (linkNum < 0 || linkNum >= NG_BRIDGE_MAX_LINKS) {
453 error = EINVAL;
454 break;
455 }
456 if ((link = priv->links[linkNum]) == NULL) {
457 error = ENOTCONN;
458 break;
459 }
460
461 /* Get/clear stats */
462 if (msg->header.cmd != NGM_BRIDGE_CLR_STATS) {
463 NG_MKRESPONSE(resp, msg,
464 sizeof(link->stats), M_NOWAIT);
465 if (resp == NULL) {
466 error = ENOMEM;
467 break;
468 }
469 bcopy(&link->stats,
470 resp->data, sizeof(link->stats));
471 }
472 if (msg->header.cmd != NGM_BRIDGE_GET_STATS)
473 bzero(&link->stats, sizeof(link->stats));
474 break;
475 }
476 case NGM_BRIDGE_GET_TABLE:
477 {
478 struct ng_bridge_host_ary *ary;
479 struct ng_bridge_hent *hent;
480 int i = 0, bucket;
481
482 NG_MKRESPONSE(resp, msg, sizeof(*ary)
483 + (priv->numHosts * sizeof(*ary->hosts)), M_NOWAIT);
484 if (resp == NULL) {
485 error = ENOMEM;
486 break;
487 }
488 ary = (struct ng_bridge_host_ary *)resp->data;
489 ary->numHosts = priv->numHosts;
490 for (bucket = 0; bucket < priv->numBuckets; bucket++) {
491 SLIST_FOREACH(hent, &priv->tab[bucket], next)
492 ary->hosts[i++] = hent->host;
493 }
494 break;
495 }
496 default:
497 error = EINVAL;
498 break;
499 }
500 break;
501 default:
502 error = EINVAL;
503 break;
504 }
505
506 /* Done */
507 NG_RESPOND_MSG(error, node, item, resp);
508 NG_FREE_MSG(msg);
509 return (error);
510}
511
512/*
513 * Receive data on a hook
514 */
515static int
516ng_bridge_rcvdata(hook_p hook, item_p item)
517{
518 const node_p node = NG_HOOK_NODE(hook);
519 const priv_p priv = NG_NODE_PRIVATE(node);
520 struct ng_bridge_host *host;
521 struct ng_bridge_link *link;
522 struct ether_header *eh;
523 int error = 0, linkNum;
524 int manycast;
525 struct mbuf *m;
526 meta_p meta;
527 struct ng_bridge_link *firstLink;
528
529 NGI_GET_M(item, m);
530 /* Get link number */
531 linkNum = (intptr_t)NG_HOOK_PRIVATE(hook);
532 KASSERT(linkNum >= 0 && linkNum < NG_BRIDGE_MAX_LINKS,
533 ("%s: linkNum=%u", __func__, linkNum));
534 link = priv->links[linkNum];
535 KASSERT(link != NULL, ("%s: link%d null", __func__, linkNum));
536
537 /* Sanity check packet and pull up header */
538 if (m->m_pkthdr.len < ETHER_HDR_LEN) {
539 link->stats.recvRunts++;
540 NG_FREE_ITEM(item);
541 NG_FREE_M(m);
542 return (EINVAL);
543 }
544 if (m->m_len < ETHER_HDR_LEN && !(m = m_pullup(m, ETHER_HDR_LEN))) {
545 link->stats.memoryFailures++;
546 NG_FREE_ITEM(item);
547 return (ENOBUFS);
548 }
549 eh = mtod(m, struct ether_header *);
550 if ((eh->ether_shost[0] & 1) != 0) {
551 link->stats.recvInvalid++;
552 NG_FREE_ITEM(item);
553 NG_FREE_M(m);
554 return (EINVAL);
555 }
556
557 /* Is link disabled due to a loopback condition? */
558 if (link->loopCount != 0) {
559 link->stats.loopDrops++;
560 NG_FREE_ITEM(item);
561 NG_FREE_M(m);
562 return (ELOOP); /* XXX is this an appropriate error? */
563 }
564
565 /* Update stats */
566 link->stats.recvPackets++;
567 link->stats.recvOctets += m->m_pkthdr.len;
568 if ((manycast = (eh->ether_dhost[0] & 1)) != 0) {
569 if (ETHER_EQUAL(eh->ether_dhost, ng_bridge_bcast_addr)) {
570 link->stats.recvBroadcasts++;
571 manycast = 2;
572 } else
573 link->stats.recvMulticasts++;
574 }
575
576 /* Look up packet's source Ethernet address in hashtable */
577 if ((host = ng_bridge_get(priv, eh->ether_shost)) != NULL) {
578
579 /* Update time since last heard from this host */
580 host->staleness = 0;
581
582 /* Did host jump to a different link? */
583 if (host->linkNum != linkNum) {
584
585 /*
586 * If the host's old link was recently established
587 * on the old link and it's already jumped to a new
588 * link, declare a loopback condition.
589 */
590 if (host->age < priv->conf.minStableAge) {
591
592 /* Log the problem */
593 if (priv->conf.debugLevel >= 2) {
594 struct ifnet *ifp = m->m_pkthdr.rcvif;
595 char suffix[32];
596
597 if (ifp != NULL)
598 snprintf(suffix, sizeof(suffix),
599 " (%s)", ifp->if_xname);
600 else
601 *suffix = '\0';
602 log(LOG_WARNING, "ng_bridge: %s:"
603 " loopback detected on %s%s\n",
604 ng_bridge_nodename(node),
605 NG_HOOK_NAME(hook), suffix);
606 }
607
608 /* Mark link as linka non grata */
609 link->loopCount = priv->conf.loopTimeout;
610 link->stats.loopDetects++;
611
612 /* Forget all hosts on this link */
613 ng_bridge_remove_hosts(priv, linkNum);
614
615 /* Drop packet */
616 link->stats.loopDrops++;
617 NG_FREE_ITEM(item);
618 NG_FREE_M(m);
619 return (ELOOP); /* XXX appropriate? */
620 }
621
622 /* Move host over to new link */
623 host->linkNum = linkNum;
624 host->age = 0;
625 }
626 } else {
627 if (!ng_bridge_put(priv, eh->ether_shost, linkNum)) {
628 link->stats.memoryFailures++;
629 NG_FREE_ITEM(item);
630 NG_FREE_M(m);
631 return (ENOMEM);
632 }
633 }
634
635 /* Run packet through ipfw processing, if enabled */
636 if (priv->conf.ipfw[linkNum] && fw_enable && ip_fw_chk_ptr != NULL) {
637 /* XXX not implemented yet */
638 }
639
640 /*
641 * If unicast and destination host known, deliver to host's link,
642 * unless it is the same link as the packet came in on.
643 */
644 if (!manycast) {
645
646 /* Determine packet destination link */
647 if ((host = ng_bridge_get(priv, eh->ether_dhost)) != NULL) {
648 struct ng_bridge_link *const destLink
649 = priv->links[host->linkNum];
650
651 /* If destination same as incoming link, do nothing */
652 KASSERT(destLink != NULL,
653 ("%s: link%d null", __func__, host->linkNum));
654 if (destLink == link) {
655 NG_FREE_ITEM(item);
656 NG_FREE_M(m);
657 return (0);
658 }
659
660 /* Deliver packet out the destination link */
661 destLink->stats.xmitPackets++;
662 destLink->stats.xmitOctets += m->m_pkthdr.len;
663 NG_FWD_NEW_DATA(error, item, destLink->hook, m);
664 return (error);
665 }
666
667 /* Destination host is not known */
668 link->stats.recvUnknown++;
669 }
670
671 /* Distribute unknown, multicast, broadcast pkts to all other links */
672 meta = NGI_META(item); /* peek.. */
673 firstLink = NULL;
674 for (linkNum = 0; linkNum <= priv->numLinks; linkNum++) {
675 struct ng_bridge_link *destLink;
676 meta_p meta2 = NULL;
677 struct mbuf *m2 = NULL;
678
679 /*
680 * If we have checked all the links then now
681 * send the original on its reserved link
682 */
683 if (linkNum == priv->numLinks) {
684 /* If we never saw a good link, leave. */
685 if (firstLink == NULL) {
686 NG_FREE_ITEM(item);
687 NG_FREE_M(m);
688 return (0);
689 }
690 destLink = firstLink;
691 } else {
692 destLink = priv->links[linkNum];
693 /* Skip incoming link and disconnected links */
694 if (destLink == NULL || destLink == link) {
695 continue;
696 }
697 if (firstLink == NULL) {
698 /*
699 * This is the first usable link we have found.
700 * Reserve it for the originals.
701 * If we never find another we save a copy.
702 */
703 firstLink = destLink;
704 continue;
705 }
706
707 /*
708 * It's usable link but not the reserved (first) one.
709 * Copy mbuf and meta info for sending.
710 */
711 m2 = m_dup(m, M_DONTWAIT); /* XXX m_copypacket() */
712 if (m2 == NULL) {
713 link->stats.memoryFailures++;
714 NG_FREE_ITEM(item);
715 NG_FREE_M(m);
716 return (ENOBUFS);
717 }
718 if (meta != NULL
719 && (meta2 = ng_copy_meta(meta)) == NULL) {
720 link->stats.memoryFailures++;
721 m_freem(m2);
722 NG_FREE_ITEM(item);
723 NG_FREE_M(m);
724 return (ENOMEM);
725 }
726 }
727
728 /* Update stats */
729 destLink->stats.xmitPackets++;
730 destLink->stats.xmitOctets += m->m_pkthdr.len;
731 switch (manycast) {
732 case 0: /* unicast */
733 break;
734 case 1: /* multicast */
735 destLink->stats.xmitMulticasts++;
736 break;
737 case 2: /* broadcast */
738 destLink->stats.xmitBroadcasts++;
739 break;
740 }
741
742 /* Send packet */
743 if (destLink == firstLink) {
744 /*
745 * If we've sent all the others, send the original
746 * on the first link we found.
747 */
748 NG_FWD_NEW_DATA(error, item, destLink->hook, m);
749 break; /* always done last - not really needed. */
750 } else {
751 NG_SEND_DATA(error, destLink->hook, m2, meta2);
752 }
753 }
754 return (error);
755}
756
757/*
758 * Shutdown node
759 */
760static int
761ng_bridge_shutdown(node_p node)
762{
763 const priv_p priv = NG_NODE_PRIVATE(node);
764
765 /*
766 * Shut down everything except the timer. There's no way to
767 * avoid another possible timeout event (it may have already
768 * been dequeued), so we can't free the node yet.
769 */
770 KASSERT(priv->numLinks == 0 && priv->numHosts == 0,
771 ("%s: numLinks=%d numHosts=%d",
772 __func__, priv->numLinks, priv->numHosts));
773 FREE(priv->tab, M_NETGRAPH_BRIDGE);
774
775 /* NG_INVALID flag is now set so node will be freed at next timeout */
776 return (0);
777}
778
779/*
780 * Hook disconnection.
781 */
782static int
783ng_bridge_disconnect(hook_p hook)
784{
785 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
786 int linkNum;
787
788 /* Get link number */
789 linkNum = (intptr_t)NG_HOOK_PRIVATE(hook);
790 KASSERT(linkNum >= 0 && linkNum < NG_BRIDGE_MAX_LINKS,
791 ("%s: linkNum=%u", __func__, linkNum));
792
793 /* Remove all hosts associated with this link */
794 ng_bridge_remove_hosts(priv, linkNum);
795
796 /* Free associated link information */
797 KASSERT(priv->links[linkNum] != NULL, ("%s: no link", __func__));
798 FREE(priv->links[linkNum], M_NETGRAPH_BRIDGE);
799 priv->links[linkNum] = NULL;
800 priv->numLinks--;
801
802 /* If no more hooks, go away */
803 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
804 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
805 ng_rmnode_self(NG_HOOK_NODE(hook));
806 }
807 return (0);
808}
809
810/******************************************************************
811 HASH TABLE FUNCTIONS
812******************************************************************/
813
814/*
815 * Hash algorithm
816 *
817 * Only hashing bytes 3-6 of the Ethernet address is sufficient and fast.
818 */
819#define HASH(addr,mask) ( (((const u_int16_t *)(addr))[0] \
820 ^ ((const u_int16_t *)(addr))[1] \
821 ^ ((const u_int16_t *)(addr))[2]) & (mask) )
822
823/*
824 * Find a host entry in the table.
825 */
826static struct ng_bridge_host *
827ng_bridge_get(priv_p priv, const u_char *addr)
828{
829 const int bucket = HASH(addr, priv->hashMask);
830 struct ng_bridge_hent *hent;
831
832 SLIST_FOREACH(hent, &priv->tab[bucket], next) {
833 if (ETHER_EQUAL(hent->host.addr, addr))
834 return (&hent->host);
835 }
836 return (NULL);
837}
838
839/*
840 * Add a new host entry to the table. This assumes the host doesn't
841 * already exist in the table. Returns 1 on success, 0 if there
842 * was a memory allocation failure.
843 */
844static int
845ng_bridge_put(priv_p priv, const u_char *addr, int linkNum)
846{
847 const int bucket = HASH(addr, priv->hashMask);
848 struct ng_bridge_hent *hent;
849
850#ifdef INVARIANTS
851 /* Assert that entry does not already exist in hashtable */
852 SLIST_FOREACH(hent, &priv->tab[bucket], next) {
853 KASSERT(!ETHER_EQUAL(hent->host.addr, addr),
854 ("%s: entry %6D exists in table", __func__, addr, ":"));
855 }
856#endif
857
858 /* Allocate and initialize new hashtable entry */
859 MALLOC(hent, struct ng_bridge_hent *,
860 sizeof(*hent), M_NETGRAPH_BRIDGE, M_NOWAIT);
861 if (hent == NULL)
862 return (0);
863 bcopy(addr, hent->host.addr, ETHER_ADDR_LEN);
864 hent->host.linkNum = linkNum;
865 hent->host.staleness = 0;
866 hent->host.age = 0;
867
868 /* Add new element to hash bucket */
869 SLIST_INSERT_HEAD(&priv->tab[bucket], hent, next);
870 priv->numHosts++;
871
872 /* Resize table if necessary */
873 ng_bridge_rehash(priv);
874 return (1);
875}
876
877/*
878 * Resize the hash table. We try to maintain the number of buckets
879 * such that the load factor is in the range 0.25 to 1.0.
880 *
881 * If we can't get the new memory then we silently fail. This is OK
882 * because things will still work and we'll try again soon anyway.
883 */
884static void
885ng_bridge_rehash(priv_p priv)
886{
887 struct ng_bridge_bucket *newTab;
888 int oldBucket, newBucket;
889 int newNumBuckets;
890 u_int newMask;
891
892 /* Is table too full or too empty? */
893 if (priv->numHosts > priv->numBuckets
894 && (priv->numBuckets << 1) <= MAX_BUCKETS)
895 newNumBuckets = priv->numBuckets << 1;
896 else if (priv->numHosts < (priv->numBuckets >> 2)
897 && (priv->numBuckets >> 2) >= MIN_BUCKETS)
898 newNumBuckets = priv->numBuckets >> 2;
899 else
900 return;
901 newMask = newNumBuckets - 1;
902
903 /* Allocate and initialize new table */
904 MALLOC(newTab, struct ng_bridge_bucket *,
905 newNumBuckets * sizeof(*newTab), M_NETGRAPH_BRIDGE, M_NOWAIT | M_ZERO);
906 if (newTab == NULL)
907 return;
908
909 /* Move all entries from old table to new table */
910 for (oldBucket = 0; oldBucket < priv->numBuckets; oldBucket++) {
911 struct ng_bridge_bucket *const oldList = &priv->tab[oldBucket];
912
913 while (!SLIST_EMPTY(oldList)) {
914 struct ng_bridge_hent *const hent
915 = SLIST_FIRST(oldList);
916
917 SLIST_REMOVE_HEAD(oldList, next);
918 newBucket = HASH(hent->host.addr, newMask);
919 SLIST_INSERT_HEAD(&newTab[newBucket], hent, next);
920 }
921 }
922
923 /* Replace old table with new one */
924 if (priv->conf.debugLevel >= 3) {
925 log(LOG_INFO, "ng_bridge: %s: table size %d -> %d\n",
926 ng_bridge_nodename(priv->node),
927 priv->numBuckets, newNumBuckets);
928 }
929 FREE(priv->tab, M_NETGRAPH_BRIDGE);
930 priv->numBuckets = newNumBuckets;
931 priv->hashMask = newMask;
932 priv->tab = newTab;
933 return;
934}
935
936/******************************************************************
937 MISC FUNCTIONS
938******************************************************************/
939
940/*
941 * Remove all hosts associated with a specific link from the hashtable.
942 * If linkNum == -1, then remove all hosts in the table.
943 */
944static void
945ng_bridge_remove_hosts(priv_p priv, int linkNum)
946{
947 int bucket;
948
949 for (bucket = 0; bucket < priv->numBuckets; bucket++) {
950 struct ng_bridge_hent **hptr = &SLIST_FIRST(&priv->tab[bucket]);
951
952 while (*hptr != NULL) {
953 struct ng_bridge_hent *const hent = *hptr;
954
955 if (linkNum == -1 || hent->host.linkNum == linkNum) {
956 *hptr = SLIST_NEXT(hent, next);
957 FREE(hent, M_NETGRAPH_BRIDGE);
958 priv->numHosts--;
959 } else
960 hptr = &SLIST_NEXT(hent, next);
961 }
962 }
963}
964
965/*
966 * Handle our once-per-second timeout event. We do two things:
967 * we decrement link->loopCount for those links being muted due to
968 * a detected loopback condition, and we remove any hosts from
969 * the hashtable whom we haven't heard from in a long while.
970 *
971 * If the node has the NG_INVALID flag set, our job is to kill it.
972 */
973static void
974ng_bridge_timeout(void *arg)
975{
976 const node_p node = arg;
977 const priv_p priv = NG_NODE_PRIVATE(node);
978 int s, bucket;
979 int counter = 0;
980 int linkNum;
981
982 /* If node was shut down, this is the final lingering timeout */
983 s = splnet();
984 if (NG_NODE_NOT_VALID(node)) {
985 FREE(priv, M_NETGRAPH_BRIDGE);
986 NG_NODE_SET_PRIVATE(node, NULL);
987 NG_NODE_UNREF(node);
988 splx(s);
989 return;
990 }
991
992 /* Register a new timeout, keeping the existing node reference */
993 callout_reset(&priv->timer, hz, ng_bridge_timeout, node);
994
995 /* Update host time counters and remove stale entries */
996 for (bucket = 0; bucket < priv->numBuckets; bucket++) {
997 struct ng_bridge_hent **hptr = &SLIST_FIRST(&priv->tab[bucket]);
998
999 while (*hptr != NULL) {
1000 struct ng_bridge_hent *const hent = *hptr;
1001
1002 /* Make sure host's link really exists */
1003 KASSERT(priv->links[hent->host.linkNum] != NULL,
1004 ("%s: host %6D on nonexistent link %d\n",
1005 __func__, hent->host.addr, ":",
1006 hent->host.linkNum));
1007
1008 /* Remove hosts we haven't heard from in a while */
1009 if (++hent->host.staleness >= priv->conf.maxStaleness) {
1010 *hptr = SLIST_NEXT(hent, next);
1011 FREE(hent, M_NETGRAPH_BRIDGE);
1012 priv->numHosts--;
1013 } else {
1014 if (hent->host.age < 0xffff)
1015 hent->host.age++;
1016 hptr = &SLIST_NEXT(hent, next);
1017 counter++;
1018 }
1019 }
1020 }
1021 KASSERT(priv->numHosts == counter,
1022 ("%s: hosts: %d != %d", __func__, priv->numHosts, counter));
1023
1024 /* Decrease table size if necessary */
1025 ng_bridge_rehash(priv);
1026
1027 /* Decrease loop counter on muted looped back links */
1028 for (counter = linkNum = 0; linkNum < NG_BRIDGE_MAX_LINKS; linkNum++) {
1029 struct ng_bridge_link *const link = priv->links[linkNum];
1030
1031 if (link != NULL) {
1032 if (link->loopCount != 0) {
1033 link->loopCount--;
1034 if (link->loopCount == 0
1035 && priv->conf.debugLevel >= 2) {
1036 log(LOG_INFO, "ng_bridge: %s:"
1037 " restoring looped back link%d\n",
1038 ng_bridge_nodename(node), linkNum);
1039 }
1040 }
1041 counter++;
1042 }
1043 }
1044 KASSERT(priv->numLinks == counter,
1045 ("%s: links: %d != %d", __func__, priv->numLinks, counter));
1046
1047 /* Done */
1048 splx(s);
1049}
1050
1051/*
1052 * Return node's "name", even if it doesn't have one.
1053 */
1054static const char *
1055ng_bridge_nodename(node_p node)
1056{
1057 static char name[NG_NODELEN+1];
1058
1059 if (NG_NODE_NAME(node) != NULL)
1060 snprintf(name, sizeof(name), "%s", NG_NODE_NAME(node));
1061 else
1062 snprintf(name, sizeof(name), "[%x]", ng_node2ID(node));
1063 return name;
1064}
1065