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 130931 2004-06-22 18:56:47Z green $
| 39 * $FreeBSD: head/sys/netgraph/ng_bridge.c 131155 2004-06-26 22:24:16Z julian $
|
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
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[]
174 = NG_BRIDGE_HOST_TYPE_INFO(&ng_parse_enaddr_type);
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 .version = NG_ABI_VERSION,
275 .name = NG_BRIDGE_NODE_TYPE,
276 .constructor = ng_bridge_constructor,
277 .rcvmsg = ng_bridge_rcvmsg,
278 .shutdown = ng_bridge_shutdown,
279 .newhook = ng_bridge_newhook,
280 .rcvdata = ng_bridge_rcvdata,
281 .disconnect = ng_bridge_disconnect,
282 .cmdlist = ng_bridge_cmdlist,
283};
284NETGRAPH_INIT(bridge, &ng_bridge_typestruct);
285
286/******************************************************************
287 NETGRAPH NODE METHODS
288******************************************************************/
289
290/*
291 * Node constructor
292 */
293static int
294ng_bridge_constructor(node_p node)
295{
296 priv_p priv;
297
298 /* Allocate and initialize private info */
299 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH_BRIDGE, M_NOWAIT | M_ZERO);
300 if (priv == NULL)
301 return (ENOMEM);
302 callout_init(&priv->timer, 0);
303
304 /* Allocate and initialize hash table, etc. */
305 MALLOC(priv->tab, struct ng_bridge_bucket *,
306 MIN_BUCKETS * sizeof(*priv->tab), M_NETGRAPH_BRIDGE, M_NOWAIT | M_ZERO);
307 if (priv->tab == NULL) {
308 FREE(priv, M_NETGRAPH_BRIDGE);
309 return (ENOMEM);
310 }
311 priv->numBuckets = MIN_BUCKETS;
312 priv->hashMask = MIN_BUCKETS - 1;
313 priv->conf.debugLevel = 1;
314 priv->conf.loopTimeout = DEFAULT_LOOP_TIMEOUT;
315 priv->conf.maxStaleness = DEFAULT_MAX_STALENESS;
316 priv->conf.minStableAge = DEFAULT_MIN_STABLE_AGE;
317
318 /*
319 * This node has all kinds of stuff that could be screwed by SMP.
320 * Until it gets it's own internal protection, we go through in
321 * single file. This could hurt a machine bridging beteen two
322 * GB ethernets so it should be fixed.
323 * When it's fixed the process SHOULD NOT SLEEP, spinlocks please!
324 * (and atomic ops )
325 */
326 NG_NODE_FORCE_WRITER(node);
327 NG_NODE_SET_PRIVATE(node, priv);
328 priv->node = node;
329
330 /* Start timer; timer is always running while node is alive */
331 callout_reset(&priv->timer, hz, ng_bridge_timeout, priv->node);
332
333 /* Done */
334 return (0);
335}
336
337/*
338 * Method for attaching a new hook
339 */
340static int
341ng_bridge_newhook(node_p node, hook_p hook, const char *name)
342{
343 const priv_p priv = NG_NODE_PRIVATE(node);
344
345 /* Check for a link hook */
346 if (strncmp(name, NG_BRIDGE_HOOK_LINK_PREFIX,
347 strlen(NG_BRIDGE_HOOK_LINK_PREFIX)) == 0) {
348 const char *cp;
349 char *eptr;
350 u_long linkNum;
351
352 cp = name + strlen(NG_BRIDGE_HOOK_LINK_PREFIX);
353 if (!isdigit(*cp) || (cp[0] == '0' && cp[1] != '\0'))
354 return (EINVAL);
355 linkNum = strtoul(cp, &eptr, 10);
356 if (*eptr != '\0' || linkNum >= NG_BRIDGE_MAX_LINKS)
357 return (EINVAL);
358 if (priv->links[linkNum] != NULL)
359 return (EISCONN);
360 MALLOC(priv->links[linkNum], struct ng_bridge_link *,
361 sizeof(*priv->links[linkNum]), M_NETGRAPH_BRIDGE, M_NOWAIT|M_ZERO);
362 if (priv->links[linkNum] == NULL)
363 return (ENOMEM);
364 priv->links[linkNum]->hook = hook;
365 NG_HOOK_SET_PRIVATE(hook, (void *)linkNum);
366 priv->numLinks++;
367 return (0);
368 }
369
370 /* Unknown hook name */
371 return (EINVAL);
372}
373
374/*
375 * Receive a control message
376 */
377static int
378ng_bridge_rcvmsg(node_p node, item_p item, hook_p lasthook)
379{
380 const priv_p priv = NG_NODE_PRIVATE(node);
381 struct ng_mesg *resp = NULL;
382 int error = 0;
383 struct ng_mesg *msg;
384
385 NGI_GET_MSG(item, msg);
386 switch (msg->header.typecookie) {
387 case NGM_BRIDGE_COOKIE:
388 switch (msg->header.cmd) {
389 case NGM_BRIDGE_GET_CONFIG:
390 {
391 struct ng_bridge_config *conf;
392
393 NG_MKRESPONSE(resp, msg,
394 sizeof(struct ng_bridge_config), M_NOWAIT);
395 if (resp == NULL) {
396 error = ENOMEM;
397 break;
398 }
399 conf = (struct ng_bridge_config *)resp->data;
400 *conf = priv->conf; /* no sanity checking needed */
401 break;
402 }
403 case NGM_BRIDGE_SET_CONFIG:
404 {
405 struct ng_bridge_config *conf;
406 int i;
407
408 if (msg->header.arglen
409 != sizeof(struct ng_bridge_config)) {
410 error = EINVAL;
411 break;
412 }
413 conf = (struct ng_bridge_config *)msg->data;
414 priv->conf = *conf;
415 for (i = 0; i < NG_BRIDGE_MAX_LINKS; i++)
416 priv->conf.ipfw[i] = !!priv->conf.ipfw[i];
417 break;
418 }
419 case NGM_BRIDGE_RESET:
420 {
421 int i;
422
423 /* Flush all entries in the hash table */
424 ng_bridge_remove_hosts(priv, -1);
425
426 /* Reset all loop detection counters and stats */
427 for (i = 0; i < NG_BRIDGE_MAX_LINKS; i++) {
428 if (priv->links[i] == NULL)
429 continue;
430 priv->links[i]->loopCount = 0;
431 bzero(&priv->links[i]->stats,
432 sizeof(priv->links[i]->stats));
433 }
434 break;
435 }
436 case NGM_BRIDGE_GET_STATS:
437 case NGM_BRIDGE_CLR_STATS:
438 case NGM_BRIDGE_GETCLR_STATS:
439 {
440 struct ng_bridge_link *link;
441 int linkNum;
442
443 /* Get link number */
444 if (msg->header.arglen != sizeof(u_int32_t)) {
445 error = EINVAL;
446 break;
447 }
448 linkNum = *((u_int32_t *)msg->data);
449 if (linkNum < 0 || linkNum >= NG_BRIDGE_MAX_LINKS) {
450 error = EINVAL;
451 break;
452 }
453 if ((link = priv->links[linkNum]) == NULL) {
454 error = ENOTCONN;
455 break;
456 }
457
458 /* Get/clear stats */
459 if (msg->header.cmd != NGM_BRIDGE_CLR_STATS) {
460 NG_MKRESPONSE(resp, msg,
461 sizeof(link->stats), M_NOWAIT);
462 if (resp == NULL) {
463 error = ENOMEM;
464 break;
465 }
466 bcopy(&link->stats,
467 resp->data, sizeof(link->stats));
468 }
469 if (msg->header.cmd != NGM_BRIDGE_GET_STATS)
470 bzero(&link->stats, sizeof(link->stats));
471 break;
472 }
473 case NGM_BRIDGE_GET_TABLE:
474 {
475 struct ng_bridge_host_ary *ary;
476 struct ng_bridge_hent *hent;
477 int i = 0, bucket;
478
479 NG_MKRESPONSE(resp, msg, sizeof(*ary)
480 + (priv->numHosts * sizeof(*ary->hosts)), M_NOWAIT);
481 if (resp == NULL) {
482 error = ENOMEM;
483 break;
484 }
485 ary = (struct ng_bridge_host_ary *)resp->data;
486 ary->numHosts = priv->numHosts;
487 for (bucket = 0; bucket < priv->numBuckets; bucket++) {
488 SLIST_FOREACH(hent, &priv->tab[bucket], next)
489 ary->hosts[i++] = hent->host;
490 }
491 break;
492 }
493 default:
494 error = EINVAL;
495 break;
496 }
497 break;
498 default:
499 error = EINVAL;
500 break;
501 }
502
503 /* Done */
504 NG_RESPOND_MSG(error, node, item, resp);
505 NG_FREE_MSG(msg);
506 return (error);
507}
508
509/*
510 * Receive data on a hook
511 */
512static int
513ng_bridge_rcvdata(hook_p hook, item_p item)
514{
515 const node_p node = NG_HOOK_NODE(hook);
516 const priv_p priv = NG_NODE_PRIVATE(node);
517 struct ng_bridge_host *host;
518 struct ng_bridge_link *link;
519 struct ether_header *eh;
520 int error = 0, linkNum, linksSeen;
521 int manycast;
522 struct mbuf *m;
| 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
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[]
174 = NG_BRIDGE_HOST_TYPE_INFO(&ng_parse_enaddr_type);
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 .version = NG_ABI_VERSION,
275 .name = NG_BRIDGE_NODE_TYPE,
276 .constructor = ng_bridge_constructor,
277 .rcvmsg = ng_bridge_rcvmsg,
278 .shutdown = ng_bridge_shutdown,
279 .newhook = ng_bridge_newhook,
280 .rcvdata = ng_bridge_rcvdata,
281 .disconnect = ng_bridge_disconnect,
282 .cmdlist = ng_bridge_cmdlist,
283};
284NETGRAPH_INIT(bridge, &ng_bridge_typestruct);
285
286/******************************************************************
287 NETGRAPH NODE METHODS
288******************************************************************/
289
290/*
291 * Node constructor
292 */
293static int
294ng_bridge_constructor(node_p node)
295{
296 priv_p priv;
297
298 /* Allocate and initialize private info */
299 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH_BRIDGE, M_NOWAIT | M_ZERO);
300 if (priv == NULL)
301 return (ENOMEM);
302 callout_init(&priv->timer, 0);
303
304 /* Allocate and initialize hash table, etc. */
305 MALLOC(priv->tab, struct ng_bridge_bucket *,
306 MIN_BUCKETS * sizeof(*priv->tab), M_NETGRAPH_BRIDGE, M_NOWAIT | M_ZERO);
307 if (priv->tab == NULL) {
308 FREE(priv, M_NETGRAPH_BRIDGE);
309 return (ENOMEM);
310 }
311 priv->numBuckets = MIN_BUCKETS;
312 priv->hashMask = MIN_BUCKETS - 1;
313 priv->conf.debugLevel = 1;
314 priv->conf.loopTimeout = DEFAULT_LOOP_TIMEOUT;
315 priv->conf.maxStaleness = DEFAULT_MAX_STALENESS;
316 priv->conf.minStableAge = DEFAULT_MIN_STABLE_AGE;
317
318 /*
319 * This node has all kinds of stuff that could be screwed by SMP.
320 * Until it gets it's own internal protection, we go through in
321 * single file. This could hurt a machine bridging beteen two
322 * GB ethernets so it should be fixed.
323 * When it's fixed the process SHOULD NOT SLEEP, spinlocks please!
324 * (and atomic ops )
325 */
326 NG_NODE_FORCE_WRITER(node);
327 NG_NODE_SET_PRIVATE(node, priv);
328 priv->node = node;
329
330 /* Start timer; timer is always running while node is alive */
331 callout_reset(&priv->timer, hz, ng_bridge_timeout, priv->node);
332
333 /* Done */
334 return (0);
335}
336
337/*
338 * Method for attaching a new hook
339 */
340static int
341ng_bridge_newhook(node_p node, hook_p hook, const char *name)
342{
343 const priv_p priv = NG_NODE_PRIVATE(node);
344
345 /* Check for a link hook */
346 if (strncmp(name, NG_BRIDGE_HOOK_LINK_PREFIX,
347 strlen(NG_BRIDGE_HOOK_LINK_PREFIX)) == 0) {
348 const char *cp;
349 char *eptr;
350 u_long linkNum;
351
352 cp = name + strlen(NG_BRIDGE_HOOK_LINK_PREFIX);
353 if (!isdigit(*cp) || (cp[0] == '0' && cp[1] != '\0'))
354 return (EINVAL);
355 linkNum = strtoul(cp, &eptr, 10);
356 if (*eptr != '\0' || linkNum >= NG_BRIDGE_MAX_LINKS)
357 return (EINVAL);
358 if (priv->links[linkNum] != NULL)
359 return (EISCONN);
360 MALLOC(priv->links[linkNum], struct ng_bridge_link *,
361 sizeof(*priv->links[linkNum]), M_NETGRAPH_BRIDGE, M_NOWAIT|M_ZERO);
362 if (priv->links[linkNum] == NULL)
363 return (ENOMEM);
364 priv->links[linkNum]->hook = hook;
365 NG_HOOK_SET_PRIVATE(hook, (void *)linkNum);
366 priv->numLinks++;
367 return (0);
368 }
369
370 /* Unknown hook name */
371 return (EINVAL);
372}
373
374/*
375 * Receive a control message
376 */
377static int
378ng_bridge_rcvmsg(node_p node, item_p item, hook_p lasthook)
379{
380 const priv_p priv = NG_NODE_PRIVATE(node);
381 struct ng_mesg *resp = NULL;
382 int error = 0;
383 struct ng_mesg *msg;
384
385 NGI_GET_MSG(item, msg);
386 switch (msg->header.typecookie) {
387 case NGM_BRIDGE_COOKIE:
388 switch (msg->header.cmd) {
389 case NGM_BRIDGE_GET_CONFIG:
390 {
391 struct ng_bridge_config *conf;
392
393 NG_MKRESPONSE(resp, msg,
394 sizeof(struct ng_bridge_config), M_NOWAIT);
395 if (resp == NULL) {
396 error = ENOMEM;
397 break;
398 }
399 conf = (struct ng_bridge_config *)resp->data;
400 *conf = priv->conf; /* no sanity checking needed */
401 break;
402 }
403 case NGM_BRIDGE_SET_CONFIG:
404 {
405 struct ng_bridge_config *conf;
406 int i;
407
408 if (msg->header.arglen
409 != sizeof(struct ng_bridge_config)) {
410 error = EINVAL;
411 break;
412 }
413 conf = (struct ng_bridge_config *)msg->data;
414 priv->conf = *conf;
415 for (i = 0; i < NG_BRIDGE_MAX_LINKS; i++)
416 priv->conf.ipfw[i] = !!priv->conf.ipfw[i];
417 break;
418 }
419 case NGM_BRIDGE_RESET:
420 {
421 int i;
422
423 /* Flush all entries in the hash table */
424 ng_bridge_remove_hosts(priv, -1);
425
426 /* Reset all loop detection counters and stats */
427 for (i = 0; i < NG_BRIDGE_MAX_LINKS; i++) {
428 if (priv->links[i] == NULL)
429 continue;
430 priv->links[i]->loopCount = 0;
431 bzero(&priv->links[i]->stats,
432 sizeof(priv->links[i]->stats));
433 }
434 break;
435 }
436 case NGM_BRIDGE_GET_STATS:
437 case NGM_BRIDGE_CLR_STATS:
438 case NGM_BRIDGE_GETCLR_STATS:
439 {
440 struct ng_bridge_link *link;
441 int linkNum;
442
443 /* Get link number */
444 if (msg->header.arglen != sizeof(u_int32_t)) {
445 error = EINVAL;
446 break;
447 }
448 linkNum = *((u_int32_t *)msg->data);
449 if (linkNum < 0 || linkNum >= NG_BRIDGE_MAX_LINKS) {
450 error = EINVAL;
451 break;
452 }
453 if ((link = priv->links[linkNum]) == NULL) {
454 error = ENOTCONN;
455 break;
456 }
457
458 /* Get/clear stats */
459 if (msg->header.cmd != NGM_BRIDGE_CLR_STATS) {
460 NG_MKRESPONSE(resp, msg,
461 sizeof(link->stats), M_NOWAIT);
462 if (resp == NULL) {
463 error = ENOMEM;
464 break;
465 }
466 bcopy(&link->stats,
467 resp->data, sizeof(link->stats));
468 }
469 if (msg->header.cmd != NGM_BRIDGE_GET_STATS)
470 bzero(&link->stats, sizeof(link->stats));
471 break;
472 }
473 case NGM_BRIDGE_GET_TABLE:
474 {
475 struct ng_bridge_host_ary *ary;
476 struct ng_bridge_hent *hent;
477 int i = 0, bucket;
478
479 NG_MKRESPONSE(resp, msg, sizeof(*ary)
480 + (priv->numHosts * sizeof(*ary->hosts)), M_NOWAIT);
481 if (resp == NULL) {
482 error = ENOMEM;
483 break;
484 }
485 ary = (struct ng_bridge_host_ary *)resp->data;
486 ary->numHosts = priv->numHosts;
487 for (bucket = 0; bucket < priv->numBuckets; bucket++) {
488 SLIST_FOREACH(hent, &priv->tab[bucket], next)
489 ary->hosts[i++] = hent->host;
490 }
491 break;
492 }
493 default:
494 error = EINVAL;
495 break;
496 }
497 break;
498 default:
499 error = EINVAL;
500 break;
501 }
502
503 /* Done */
504 NG_RESPOND_MSG(error, node, item, resp);
505 NG_FREE_MSG(msg);
506 return (error);
507}
508
509/*
510 * Receive data on a hook
511 */
512static int
513ng_bridge_rcvdata(hook_p hook, item_p item)
514{
515 const node_p node = NG_HOOK_NODE(hook);
516 const priv_p priv = NG_NODE_PRIVATE(node);
517 struct ng_bridge_host *host;
518 struct ng_bridge_link *link;
519 struct ether_header *eh;
520 int error = 0, linkNum, linksSeen;
521 int manycast;
522 struct mbuf *m;
|
523 meta_p meta;
| |
524 struct ng_bridge_link *firstLink;
525
526 NGI_GET_M(item, m);
527 /* Get link number */
528 linkNum = (intptr_t)NG_HOOK_PRIVATE(hook);
529 KASSERT(linkNum >= 0 && linkNum < NG_BRIDGE_MAX_LINKS,
530 ("%s: linkNum=%u", __func__, linkNum));
531 link = priv->links[linkNum];
532 KASSERT(link != NULL, ("%s: link%d null", __func__, linkNum));
533
534 /* Sanity check packet and pull up header */
535 if (m->m_pkthdr.len < ETHER_HDR_LEN) {
536 link->stats.recvRunts++;
537 NG_FREE_ITEM(item);
538 NG_FREE_M(m);
539 return (EINVAL);
540 }
541 if (m->m_len < ETHER_HDR_LEN && !(m = m_pullup(m, ETHER_HDR_LEN))) {
542 link->stats.memoryFailures++;
543 NG_FREE_ITEM(item);
544 return (ENOBUFS);
545 }
546 eh = mtod(m, struct ether_header *);
547 if ((eh->ether_shost[0] & 1) != 0) {
548 link->stats.recvInvalid++;
549 NG_FREE_ITEM(item);
550 NG_FREE_M(m);
551 return (EINVAL);
552 }
553
554 /* Is link disabled due to a loopback condition? */
555 if (link->loopCount != 0) {
556 link->stats.loopDrops++;
557 NG_FREE_ITEM(item);
558 NG_FREE_M(m);
559 return (ELOOP); /* XXX is this an appropriate error? */
560 }
561
562 /* Update stats */
563 link->stats.recvPackets++;
564 link->stats.recvOctets += m->m_pkthdr.len;
565 if ((manycast = (eh->ether_dhost[0] & 1)) != 0) {
566 if (ETHER_EQUAL(eh->ether_dhost, ng_bridge_bcast_addr)) {
567 link->stats.recvBroadcasts++;
568 manycast = 2;
569 } else
570 link->stats.recvMulticasts++;
571 }
572
573 /* Look up packet's source Ethernet address in hashtable */
574 if ((host = ng_bridge_get(priv, eh->ether_shost)) != NULL) {
575
576 /* Update time since last heard from this host */
577 host->staleness = 0;
578
579 /* Did host jump to a different link? */
580 if (host->linkNum != linkNum) {
581
582 /*
583 * If the host's old link was recently established
584 * on the old link and it's already jumped to a new
585 * link, declare a loopback condition.
586 */
587 if (host->age < priv->conf.minStableAge) {
588
589 /* Log the problem */
590 if (priv->conf.debugLevel >= 2) {
591 struct ifnet *ifp = m->m_pkthdr.rcvif;
592 char suffix[32];
593
594 if (ifp != NULL)
595 snprintf(suffix, sizeof(suffix),
596 " (%s)", ifp->if_xname);
597 else
598 *suffix = '\0';
599 log(LOG_WARNING, "ng_bridge: %s:"
600 " loopback detected on %s%s\n",
601 ng_bridge_nodename(node),
602 NG_HOOK_NAME(hook), suffix);
603 }
604
605 /* Mark link as linka non grata */
606 link->loopCount = priv->conf.loopTimeout;
607 link->stats.loopDetects++;
608
609 /* Forget all hosts on this link */
610 ng_bridge_remove_hosts(priv, linkNum);
611
612 /* Drop packet */
613 link->stats.loopDrops++;
614 NG_FREE_ITEM(item);
615 NG_FREE_M(m);
616 return (ELOOP); /* XXX appropriate? */
617 }
618
619 /* Move host over to new link */
620 host->linkNum = linkNum;
621 host->age = 0;
622 }
623 } else {
624 if (!ng_bridge_put(priv, eh->ether_shost, linkNum)) {
625 link->stats.memoryFailures++;
626 NG_FREE_ITEM(item);
627 NG_FREE_M(m);
628 return (ENOMEM);
629 }
630 }
631
632 /* Run packet through ipfw processing, if enabled */
633 if (priv->conf.ipfw[linkNum] && fw_enable && ip_fw_chk_ptr != NULL) {
634 /* XXX not implemented yet */
635 }
636
637 /*
638 * If unicast and destination host known, deliver to host's link,
639 * unless it is the same link as the packet came in on.
640 */
641 if (!manycast) {
642
643 /* Determine packet destination link */
644 if ((host = ng_bridge_get(priv, eh->ether_dhost)) != NULL) {
645 struct ng_bridge_link *const destLink
646 = priv->links[host->linkNum];
647
648 /* If destination same as incoming link, do nothing */
649 KASSERT(destLink != NULL,
650 ("%s: link%d null", __func__, host->linkNum));
651 if (destLink == link) {
652 NG_FREE_ITEM(item);
653 NG_FREE_M(m);
654 return (0);
655 }
656
657 /* Deliver packet out the destination link */
658 destLink->stats.xmitPackets++;
659 destLink->stats.xmitOctets += m->m_pkthdr.len;
660 NG_FWD_NEW_DATA(error, item, destLink->hook, m);
661 return (error);
662 }
663
664 /* Destination host is not known */
665 link->stats.recvUnknown++;
666 }
667
668 /* Distribute unknown, multicast, broadcast pkts to all other links */
| 523 struct ng_bridge_link *firstLink;
524
525 NGI_GET_M(item, m);
526 /* Get link number */
527 linkNum = (intptr_t)NG_HOOK_PRIVATE(hook);
528 KASSERT(linkNum >= 0 && linkNum < NG_BRIDGE_MAX_LINKS,
529 ("%s: linkNum=%u", __func__, linkNum));
530 link = priv->links[linkNum];
531 KASSERT(link != NULL, ("%s: link%d null", __func__, linkNum));
532
533 /* Sanity check packet and pull up header */
534 if (m->m_pkthdr.len < ETHER_HDR_LEN) {
535 link->stats.recvRunts++;
536 NG_FREE_ITEM(item);
537 NG_FREE_M(m);
538 return (EINVAL);
539 }
540 if (m->m_len < ETHER_HDR_LEN && !(m = m_pullup(m, ETHER_HDR_LEN))) {
541 link->stats.memoryFailures++;
542 NG_FREE_ITEM(item);
543 return (ENOBUFS);
544 }
545 eh = mtod(m, struct ether_header *);
546 if ((eh->ether_shost[0] & 1) != 0) {
547 link->stats.recvInvalid++;
548 NG_FREE_ITEM(item);
549 NG_FREE_M(m);
550 return (EINVAL);
551 }
552
553 /* Is link disabled due to a loopback condition? */
554 if (link->loopCount != 0) {
555 link->stats.loopDrops++;
556 NG_FREE_ITEM(item);
557 NG_FREE_M(m);
558 return (ELOOP); /* XXX is this an appropriate error? */
559 }
560
561 /* Update stats */
562 link->stats.recvPackets++;
563 link->stats.recvOctets += m->m_pkthdr.len;
564 if ((manycast = (eh->ether_dhost[0] & 1)) != 0) {
565 if (ETHER_EQUAL(eh->ether_dhost, ng_bridge_bcast_addr)) {
566 link->stats.recvBroadcasts++;
567 manycast = 2;
568 } else
569 link->stats.recvMulticasts++;
570 }
571
572 /* Look up packet's source Ethernet address in hashtable */
573 if ((host = ng_bridge_get(priv, eh->ether_shost)) != NULL) {
574
575 /* Update time since last heard from this host */
576 host->staleness = 0;
577
578 /* Did host jump to a different link? */
579 if (host->linkNum != linkNum) {
580
581 /*
582 * If the host's old link was recently established
583 * on the old link and it's already jumped to a new
584 * link, declare a loopback condition.
585 */
586 if (host->age < priv->conf.minStableAge) {
587
588 /* Log the problem */
589 if (priv->conf.debugLevel >= 2) {
590 struct ifnet *ifp = m->m_pkthdr.rcvif;
591 char suffix[32];
592
593 if (ifp != NULL)
594 snprintf(suffix, sizeof(suffix),
595 " (%s)", ifp->if_xname);
596 else
597 *suffix = '\0';
598 log(LOG_WARNING, "ng_bridge: %s:"
599 " loopback detected on %s%s\n",
600 ng_bridge_nodename(node),
601 NG_HOOK_NAME(hook), suffix);
602 }
603
604 /* Mark link as linka non grata */
605 link->loopCount = priv->conf.loopTimeout;
606 link->stats.loopDetects++;
607
608 /* Forget all hosts on this link */
609 ng_bridge_remove_hosts(priv, linkNum);
610
611 /* Drop packet */
612 link->stats.loopDrops++;
613 NG_FREE_ITEM(item);
614 NG_FREE_M(m);
615 return (ELOOP); /* XXX appropriate? */
616 }
617
618 /* Move host over to new link */
619 host->linkNum = linkNum;
620 host->age = 0;
621 }
622 } else {
623 if (!ng_bridge_put(priv, eh->ether_shost, linkNum)) {
624 link->stats.memoryFailures++;
625 NG_FREE_ITEM(item);
626 NG_FREE_M(m);
627 return (ENOMEM);
628 }
629 }
630
631 /* Run packet through ipfw processing, if enabled */
632 if (priv->conf.ipfw[linkNum] && fw_enable && ip_fw_chk_ptr != NULL) {
633 /* XXX not implemented yet */
634 }
635
636 /*
637 * If unicast and destination host known, deliver to host's link,
638 * unless it is the same link as the packet came in on.
639 */
640 if (!manycast) {
641
642 /* Determine packet destination link */
643 if ((host = ng_bridge_get(priv, eh->ether_dhost)) != NULL) {
644 struct ng_bridge_link *const destLink
645 = priv->links[host->linkNum];
646
647 /* If destination same as incoming link, do nothing */
648 KASSERT(destLink != NULL,
649 ("%s: link%d null", __func__, host->linkNum));
650 if (destLink == link) {
651 NG_FREE_ITEM(item);
652 NG_FREE_M(m);
653 return (0);
654 }
655
656 /* Deliver packet out the destination link */
657 destLink->stats.xmitPackets++;
658 destLink->stats.xmitOctets += m->m_pkthdr.len;
659 NG_FWD_NEW_DATA(error, item, destLink->hook, m);
660 return (error);
661 }
662
663 /* Destination host is not known */
664 link->stats.recvUnknown++;
665 }
666
667 /* Distribute unknown, multicast, broadcast pkts to all other links */
|
669 meta = NGI_META(item); /* peek.. */
| |
670 firstLink = NULL;
671 for (linkNum = linksSeen = 0; linksSeen <= priv->numLinks; linkNum++) {
672 struct ng_bridge_link *destLink;
| 668 firstLink = NULL;
669 for (linkNum = linksSeen = 0; linksSeen <= priv->numLinks; linkNum++) {
670 struct ng_bridge_link *destLink;
|
673 meta_p meta2 = NULL;
| |
674 struct mbuf *m2 = NULL;
675
676 /*
677 * If we have checked all the links then now
678 * send the original on its reserved link
679 */
680 if (linksSeen == priv->numLinks) {
681 /* If we never saw a good link, leave. */
682 if (firstLink == NULL) {
683 NG_FREE_ITEM(item);
684 NG_FREE_M(m);
685 return (0);
686 }
687 destLink = firstLink;
688 } else {
689 destLink = priv->links[linkNum];
690 if (destLink != NULL)
691 linksSeen++;
692 /* Skip incoming link and disconnected links */
693 if (destLink == NULL || destLink == link) {
694 continue;
695 }
696 if (firstLink == NULL) {
697 /*
698 * This is the first usable link we have found.
699 * Reserve it for the originals.
700 * If we never find another we save a copy.
701 */
702 firstLink = destLink;
703 continue;
704 }
705
706 /*
707 * It's usable link but not the reserved (first) one.
| 671 struct mbuf *m2 = NULL;
672
673 /*
674 * If we have checked all the links then now
675 * send the original on its reserved link
676 */
677 if (linksSeen == priv->numLinks) {
678 /* If we never saw a good link, leave. */
679 if (firstLink == NULL) {
680 NG_FREE_ITEM(item);
681 NG_FREE_M(m);
682 return (0);
683 }
684 destLink = firstLink;
685 } else {
686 destLink = priv->links[linkNum];
687 if (destLink != NULL)
688 linksSeen++;
689 /* Skip incoming link and disconnected links */
690 if (destLink == NULL || destLink == link) {
691 continue;
692 }
693 if (firstLink == NULL) {
694 /*
695 * This is the first usable link we have found.
696 * Reserve it for the originals.
697 * If we never find another we save a copy.
698 */
699 firstLink = destLink;
700 continue;
701 }
702
703 /*
704 * It's usable link but not the reserved (first) one.
|
708 * Copy mbuf and meta info for sending.
| 705 * Copy mbuf info for sending.
|
709 */
710 m2 = m_dup(m, M_DONTWAIT); /* XXX m_copypacket() */
711 if (m2 == NULL) {
712 link->stats.memoryFailures++;
713 NG_FREE_ITEM(item);
714 NG_FREE_M(m);
715 return (ENOBUFS);
716 }
| 706 */
707 m2 = m_dup(m, M_DONTWAIT); /* XXX m_copypacket() */
708 if (m2 == NULL) {
709 link->stats.memoryFailures++;
710 NG_FREE_ITEM(item);
711 NG_FREE_M(m);
712 return (ENOBUFS);
713 }
|
717 if (meta != NULL
718 && (meta2 = ng_copy_meta(meta)) == NULL) {
719 link->stats.memoryFailures++;
720 m_freem(m2);
721 NG_FREE_ITEM(item);
722 NG_FREE_M(m);
723 return (ENOMEM);
724 }
| |
725 }
726
727 /* Update stats */
728 destLink->stats.xmitPackets++;
729 destLink->stats.xmitOctets += m->m_pkthdr.len;
730 switch (manycast) {
731 case 0: /* unicast */
732 break;
733 case 1: /* multicast */
734 destLink->stats.xmitMulticasts++;
735 break;
736 case 2: /* broadcast */
737 destLink->stats.xmitBroadcasts++;
738 break;
739 }
740
741 /* Send packet */
742 if (destLink == firstLink) {
743 /*
744 * If we've sent all the others, send the original
745 * on the first link we found.
746 */
747 NG_FWD_NEW_DATA(error, item, destLink->hook, m);
748 break; /* always done last - not really needed. */
749 } else {
| 714 }
715
716 /* Update stats */
717 destLink->stats.xmitPackets++;
718 destLink->stats.xmitOctets += m->m_pkthdr.len;
719 switch (manycast) {
720 case 0: /* unicast */
721 break;
722 case 1: /* multicast */
723 destLink->stats.xmitMulticasts++;
724 break;
725 case 2: /* broadcast */
726 destLink->stats.xmitBroadcasts++;
727 break;
728 }
729
730 /* Send packet */
731 if (destLink == firstLink) {
732 /*
733 * If we've sent all the others, send the original
734 * on the first link we found.
735 */
736 NG_FWD_NEW_DATA(error, item, destLink->hook, m);
737 break; /* always done last - not really needed. */
738 } else {
|
750 NG_SEND_DATA(error, destLink->hook, m2, meta2);
| 739 NG_SEND_DATA_ONLY(error, destLink->hook, m2);
|
751 }
752 }
753 return (error);
754}
755
756/*
757 * Shutdown node
758 */
759static int
760ng_bridge_shutdown(node_p node)
761{
762 const priv_p priv = NG_NODE_PRIVATE(node);
763
764 /*
765 * Shut down everything except the timer. There's no way to
766 * avoid another possible timeout event (it may have already
767 * been dequeued), so we can't free the node yet.
768 */
769 KASSERT(priv->numLinks == 0 && priv->numHosts == 0,
770 ("%s: numLinks=%d numHosts=%d",
771 __func__, priv->numLinks, priv->numHosts));
772 FREE(priv->tab, M_NETGRAPH_BRIDGE);
773
774 /* NG_INVALID flag is now set so node will be freed at next timeout */
775 return (0);
776}
777
778/*
779 * Hook disconnection.
780 */
781static int
782ng_bridge_disconnect(hook_p hook)
783{
784 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
785 int linkNum;
786
787 /* Get link number */
788 linkNum = (intptr_t)NG_HOOK_PRIVATE(hook);
789 KASSERT(linkNum >= 0 && linkNum < NG_BRIDGE_MAX_LINKS,
790 ("%s: linkNum=%u", __func__, linkNum));
791
792 /* Remove all hosts associated with this link */
793 ng_bridge_remove_hosts(priv, linkNum);
794
795 /* Free associated link information */
796 KASSERT(priv->links[linkNum] != NULL, ("%s: no link", __func__));
797 FREE(priv->links[linkNum], M_NETGRAPH_BRIDGE);
798 priv->links[linkNum] = NULL;
799 priv->numLinks--;
800
801 /* If no more hooks, go away */
802 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
803 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
804 ng_rmnode_self(NG_HOOK_NODE(hook));
805 }
806 return (0);
807}
808
809/******************************************************************
810 HASH TABLE FUNCTIONS
811******************************************************************/
812
813/*
814 * Hash algorithm
815 */
816#define HASH(addr,mask) ( (((const u_int16_t *)(addr))[0] \
817 ^ ((const u_int16_t *)(addr))[1] \
818 ^ ((const u_int16_t *)(addr))[2]) & (mask) )
819
820/*
821 * Find a host entry in the table.
822 */
823static struct ng_bridge_host *
824ng_bridge_get(priv_p priv, const u_char *addr)
825{
826 const int bucket = HASH(addr, priv->hashMask);
827 struct ng_bridge_hent *hent;
828
829 SLIST_FOREACH(hent, &priv->tab[bucket], next) {
830 if (ETHER_EQUAL(hent->host.addr, addr))
831 return (&hent->host);
832 }
833 return (NULL);
834}
835
836/*
837 * Add a new host entry to the table. This assumes the host doesn't
838 * already exist in the table. Returns 1 on success, 0 if there
839 * was a memory allocation failure.
840 */
841static int
842ng_bridge_put(priv_p priv, const u_char *addr, int linkNum)
843{
844 const int bucket = HASH(addr, priv->hashMask);
845 struct ng_bridge_hent *hent;
846
847#ifdef INVARIANTS
848 /* Assert that entry does not already exist in hashtable */
849 SLIST_FOREACH(hent, &priv->tab[bucket], next) {
850 KASSERT(!ETHER_EQUAL(hent->host.addr, addr),
851 ("%s: entry %6D exists in table", __func__, addr, ":"));
852 }
853#endif
854
855 /* Allocate and initialize new hashtable entry */
856 MALLOC(hent, struct ng_bridge_hent *,
857 sizeof(*hent), M_NETGRAPH_BRIDGE, M_NOWAIT);
858 if (hent == NULL)
859 return (0);
860 bcopy(addr, hent->host.addr, ETHER_ADDR_LEN);
861 hent->host.linkNum = linkNum;
862 hent->host.staleness = 0;
863 hent->host.age = 0;
864
865 /* Add new element to hash bucket */
866 SLIST_INSERT_HEAD(&priv->tab[bucket], hent, next);
867 priv->numHosts++;
868
869 /* Resize table if necessary */
870 ng_bridge_rehash(priv);
871 return (1);
872}
873
874/*
875 * Resize the hash table. We try to maintain the number of buckets
876 * such that the load factor is in the range 0.25 to 1.0.
877 *
878 * If we can't get the new memory then we silently fail. This is OK
879 * because things will still work and we'll try again soon anyway.
880 */
881static void
882ng_bridge_rehash(priv_p priv)
883{
884 struct ng_bridge_bucket *newTab;
885 int oldBucket, newBucket;
886 int newNumBuckets;
887 u_int newMask;
888
889 /* Is table too full or too empty? */
890 if (priv->numHosts > priv->numBuckets
891 && (priv->numBuckets << 1) <= MAX_BUCKETS)
892 newNumBuckets = priv->numBuckets << 1;
893 else if (priv->numHosts < (priv->numBuckets >> 2)
894 && (priv->numBuckets >> 2) >= MIN_BUCKETS)
895 newNumBuckets = priv->numBuckets >> 2;
896 else
897 return;
898 newMask = newNumBuckets - 1;
899
900 /* Allocate and initialize new table */
901 MALLOC(newTab, struct ng_bridge_bucket *,
902 newNumBuckets * sizeof(*newTab), M_NETGRAPH_BRIDGE, M_NOWAIT | M_ZERO);
903 if (newTab == NULL)
904 return;
905
906 /* Move all entries from old table to new table */
907 for (oldBucket = 0; oldBucket < priv->numBuckets; oldBucket++) {
908 struct ng_bridge_bucket *const oldList = &priv->tab[oldBucket];
909
910 while (!SLIST_EMPTY(oldList)) {
911 struct ng_bridge_hent *const hent
912 = SLIST_FIRST(oldList);
913
914 SLIST_REMOVE_HEAD(oldList, next);
915 newBucket = HASH(hent->host.addr, newMask);
916 SLIST_INSERT_HEAD(&newTab[newBucket], hent, next);
917 }
918 }
919
920 /* Replace old table with new one */
921 if (priv->conf.debugLevel >= 3) {
922 log(LOG_INFO, "ng_bridge: %s: table size %d -> %d\n",
923 ng_bridge_nodename(priv->node),
924 priv->numBuckets, newNumBuckets);
925 }
926 FREE(priv->tab, M_NETGRAPH_BRIDGE);
927 priv->numBuckets = newNumBuckets;
928 priv->hashMask = newMask;
929 priv->tab = newTab;
930 return;
931}
932
933/******************************************************************
934 MISC FUNCTIONS
935******************************************************************/
936
937/*
938 * Remove all hosts associated with a specific link from the hashtable.
939 * If linkNum == -1, then remove all hosts in the table.
940 */
941static void
942ng_bridge_remove_hosts(priv_p priv, int linkNum)
943{
944 int bucket;
945
946 for (bucket = 0; bucket < priv->numBuckets; bucket++) {
947 struct ng_bridge_hent **hptr = &SLIST_FIRST(&priv->tab[bucket]);
948
949 while (*hptr != NULL) {
950 struct ng_bridge_hent *const hent = *hptr;
951
952 if (linkNum == -1 || hent->host.linkNum == linkNum) {
953 *hptr = SLIST_NEXT(hent, next);
954 FREE(hent, M_NETGRAPH_BRIDGE);
955 priv->numHosts--;
956 } else
957 hptr = &SLIST_NEXT(hent, next);
958 }
959 }
960}
961
962/*
963 * Handle our once-per-second timeout event. We do two things:
964 * we decrement link->loopCount for those links being muted due to
965 * a detected loopback condition, and we remove any hosts from
966 * the hashtable whom we haven't heard from in a long while.
967 *
968 * If the node has the NG_INVALID flag set, our job is to kill it.
969 */
970static void
971ng_bridge_timeout(void *arg)
972{
973 const node_p node = arg;
974 const priv_p priv = NG_NODE_PRIVATE(node);
975 int s, bucket;
976 int counter = 0;
977 int linkNum;
978
979 /* If node was shut down, this is the final lingering timeout */
980 s = splnet();
981 if (NG_NODE_NOT_VALID(node)) {
982 FREE(priv, M_NETGRAPH_BRIDGE);
983 NG_NODE_SET_PRIVATE(node, NULL);
984 NG_NODE_UNREF(node);
985 splx(s);
986 return;
987 }
988
989 /* Register a new timeout, keeping the existing node reference */
990 callout_reset(&priv->timer, hz, ng_bridge_timeout, node);
991
992 /* Update host time counters and remove stale entries */
993 for (bucket = 0; bucket < priv->numBuckets; bucket++) {
994 struct ng_bridge_hent **hptr = &SLIST_FIRST(&priv->tab[bucket]);
995
996 while (*hptr != NULL) {
997 struct ng_bridge_hent *const hent = *hptr;
998
999 /* Make sure host's link really exists */
1000 KASSERT(priv->links[hent->host.linkNum] != NULL,
1001 ("%s: host %6D on nonexistent link %d\n",
1002 __func__, hent->host.addr, ":",
1003 hent->host.linkNum));
1004
1005 /* Remove hosts we haven't heard from in a while */
1006 if (++hent->host.staleness >= priv->conf.maxStaleness) {
1007 *hptr = SLIST_NEXT(hent, next);
1008 FREE(hent, M_NETGRAPH_BRIDGE);
1009 priv->numHosts--;
1010 } else {
1011 if (hent->host.age < 0xffff)
1012 hent->host.age++;
1013 hptr = &SLIST_NEXT(hent, next);
1014 counter++;
1015 }
1016 }
1017 }
1018 KASSERT(priv->numHosts == counter,
1019 ("%s: hosts: %d != %d", __func__, priv->numHosts, counter));
1020
1021 /* Decrease table size if necessary */
1022 ng_bridge_rehash(priv);
1023
1024 /* Decrease loop counter on muted looped back links */
1025 for (counter = linkNum = 0; linkNum < NG_BRIDGE_MAX_LINKS; linkNum++) {
1026 struct ng_bridge_link *const link = priv->links[linkNum];
1027
1028 if (link != NULL) {
1029 if (link->loopCount != 0) {
1030 link->loopCount--;
1031 if (link->loopCount == 0
1032 && priv->conf.debugLevel >= 2) {
1033 log(LOG_INFO, "ng_bridge: %s:"
1034 " restoring looped back link%d\n",
1035 ng_bridge_nodename(node), linkNum);
1036 }
1037 }
1038 counter++;
1039 }
1040 }
1041 KASSERT(priv->numLinks == counter,
1042 ("%s: links: %d != %d", __func__, priv->numLinks, counter));
1043
1044 /* Done */
1045 splx(s);
1046}
1047
1048/*
1049 * Return node's "name", even if it doesn't have one.
1050 */
1051static const char *
1052ng_bridge_nodename(node_p node)
1053{
1054 static char name[NG_NODESIZ];
1055
1056 if (NG_NODE_NAME(node) != NULL)
1057 snprintf(name, sizeof(name), "%s", NG_NODE_NAME(node));
1058 else
1059 snprintf(name, sizeof(name), "[%x]", ng_node2ID(node));
1060 return name;
1061}
1062
| 740 }
741 }
742 return (error);
743}
744
745/*
746 * Shutdown node
747 */
748static int
749ng_bridge_shutdown(node_p node)
750{
751 const priv_p priv = NG_NODE_PRIVATE(node);
752
753 /*
754 * Shut down everything except the timer. There's no way to
755 * avoid another possible timeout event (it may have already
756 * been dequeued), so we can't free the node yet.
757 */
758 KASSERT(priv->numLinks == 0 && priv->numHosts == 0,
759 ("%s: numLinks=%d numHosts=%d",
760 __func__, priv->numLinks, priv->numHosts));
761 FREE(priv->tab, M_NETGRAPH_BRIDGE);
762
763 /* NG_INVALID flag is now set so node will be freed at next timeout */
764 return (0);
765}
766
767/*
768 * Hook disconnection.
769 */
770static int
771ng_bridge_disconnect(hook_p hook)
772{
773 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
774 int linkNum;
775
776 /* Get link number */
777 linkNum = (intptr_t)NG_HOOK_PRIVATE(hook);
778 KASSERT(linkNum >= 0 && linkNum < NG_BRIDGE_MAX_LINKS,
779 ("%s: linkNum=%u", __func__, linkNum));
780
781 /* Remove all hosts associated with this link */
782 ng_bridge_remove_hosts(priv, linkNum);
783
784 /* Free associated link information */
785 KASSERT(priv->links[linkNum] != NULL, ("%s: no link", __func__));
786 FREE(priv->links[linkNum], M_NETGRAPH_BRIDGE);
787 priv->links[linkNum] = NULL;
788 priv->numLinks--;
789
790 /* If no more hooks, go away */
791 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
792 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
793 ng_rmnode_self(NG_HOOK_NODE(hook));
794 }
795 return (0);
796}
797
798/******************************************************************
799 HASH TABLE FUNCTIONS
800******************************************************************/
801
802/*
803 * Hash algorithm
804 */
805#define HASH(addr,mask) ( (((const u_int16_t *)(addr))[0] \
806 ^ ((const u_int16_t *)(addr))[1] \
807 ^ ((const u_int16_t *)(addr))[2]) & (mask) )
808
809/*
810 * Find a host entry in the table.
811 */
812static struct ng_bridge_host *
813ng_bridge_get(priv_p priv, const u_char *addr)
814{
815 const int bucket = HASH(addr, priv->hashMask);
816 struct ng_bridge_hent *hent;
817
818 SLIST_FOREACH(hent, &priv->tab[bucket], next) {
819 if (ETHER_EQUAL(hent->host.addr, addr))
820 return (&hent->host);
821 }
822 return (NULL);
823}
824
825/*
826 * Add a new host entry to the table. This assumes the host doesn't
827 * already exist in the table. Returns 1 on success, 0 if there
828 * was a memory allocation failure.
829 */
830static int
831ng_bridge_put(priv_p priv, const u_char *addr, int linkNum)
832{
833 const int bucket = HASH(addr, priv->hashMask);
834 struct ng_bridge_hent *hent;
835
836#ifdef INVARIANTS
837 /* Assert that entry does not already exist in hashtable */
838 SLIST_FOREACH(hent, &priv->tab[bucket], next) {
839 KASSERT(!ETHER_EQUAL(hent->host.addr, addr),
840 ("%s: entry %6D exists in table", __func__, addr, ":"));
841 }
842#endif
843
844 /* Allocate and initialize new hashtable entry */
845 MALLOC(hent, struct ng_bridge_hent *,
846 sizeof(*hent), M_NETGRAPH_BRIDGE, M_NOWAIT);
847 if (hent == NULL)
848 return (0);
849 bcopy(addr, hent->host.addr, ETHER_ADDR_LEN);
850 hent->host.linkNum = linkNum;
851 hent->host.staleness = 0;
852 hent->host.age = 0;
853
854 /* Add new element to hash bucket */
855 SLIST_INSERT_HEAD(&priv->tab[bucket], hent, next);
856 priv->numHosts++;
857
858 /* Resize table if necessary */
859 ng_bridge_rehash(priv);
860 return (1);
861}
862
863/*
864 * Resize the hash table. We try to maintain the number of buckets
865 * such that the load factor is in the range 0.25 to 1.0.
866 *
867 * If we can't get the new memory then we silently fail. This is OK
868 * because things will still work and we'll try again soon anyway.
869 */
870static void
871ng_bridge_rehash(priv_p priv)
872{
873 struct ng_bridge_bucket *newTab;
874 int oldBucket, newBucket;
875 int newNumBuckets;
876 u_int newMask;
877
878 /* Is table too full or too empty? */
879 if (priv->numHosts > priv->numBuckets
880 && (priv->numBuckets << 1) <= MAX_BUCKETS)
881 newNumBuckets = priv->numBuckets << 1;
882 else if (priv->numHosts < (priv->numBuckets >> 2)
883 && (priv->numBuckets >> 2) >= MIN_BUCKETS)
884 newNumBuckets = priv->numBuckets >> 2;
885 else
886 return;
887 newMask = newNumBuckets - 1;
888
889 /* Allocate and initialize new table */
890 MALLOC(newTab, struct ng_bridge_bucket *,
891 newNumBuckets * sizeof(*newTab), M_NETGRAPH_BRIDGE, M_NOWAIT | M_ZERO);
892 if (newTab == NULL)
893 return;
894
895 /* Move all entries from old table to new table */
896 for (oldBucket = 0; oldBucket < priv->numBuckets; oldBucket++) {
897 struct ng_bridge_bucket *const oldList = &priv->tab[oldBucket];
898
899 while (!SLIST_EMPTY(oldList)) {
900 struct ng_bridge_hent *const hent
901 = SLIST_FIRST(oldList);
902
903 SLIST_REMOVE_HEAD(oldList, next);
904 newBucket = HASH(hent->host.addr, newMask);
905 SLIST_INSERT_HEAD(&newTab[newBucket], hent, next);
906 }
907 }
908
909 /* Replace old table with new one */
910 if (priv->conf.debugLevel >= 3) {
911 log(LOG_INFO, "ng_bridge: %s: table size %d -> %d\n",
912 ng_bridge_nodename(priv->node),
913 priv->numBuckets, newNumBuckets);
914 }
915 FREE(priv->tab, M_NETGRAPH_BRIDGE);
916 priv->numBuckets = newNumBuckets;
917 priv->hashMask = newMask;
918 priv->tab = newTab;
919 return;
920}
921
922/******************************************************************
923 MISC FUNCTIONS
924******************************************************************/
925
926/*
927 * Remove all hosts associated with a specific link from the hashtable.
928 * If linkNum == -1, then remove all hosts in the table.
929 */
930static void
931ng_bridge_remove_hosts(priv_p priv, int linkNum)
932{
933 int bucket;
934
935 for (bucket = 0; bucket < priv->numBuckets; bucket++) {
936 struct ng_bridge_hent **hptr = &SLIST_FIRST(&priv->tab[bucket]);
937
938 while (*hptr != NULL) {
939 struct ng_bridge_hent *const hent = *hptr;
940
941 if (linkNum == -1 || hent->host.linkNum == linkNum) {
942 *hptr = SLIST_NEXT(hent, next);
943 FREE(hent, M_NETGRAPH_BRIDGE);
944 priv->numHosts--;
945 } else
946 hptr = &SLIST_NEXT(hent, next);
947 }
948 }
949}
950
951/*
952 * Handle our once-per-second timeout event. We do two things:
953 * we decrement link->loopCount for those links being muted due to
954 * a detected loopback condition, and we remove any hosts from
955 * the hashtable whom we haven't heard from in a long while.
956 *
957 * If the node has the NG_INVALID flag set, our job is to kill it.
958 */
959static void
960ng_bridge_timeout(void *arg)
961{
962 const node_p node = arg;
963 const priv_p priv = NG_NODE_PRIVATE(node);
964 int s, bucket;
965 int counter = 0;
966 int linkNum;
967
968 /* If node was shut down, this is the final lingering timeout */
969 s = splnet();
970 if (NG_NODE_NOT_VALID(node)) {
971 FREE(priv, M_NETGRAPH_BRIDGE);
972 NG_NODE_SET_PRIVATE(node, NULL);
973 NG_NODE_UNREF(node);
974 splx(s);
975 return;
976 }
977
978 /* Register a new timeout, keeping the existing node reference */
979 callout_reset(&priv->timer, hz, ng_bridge_timeout, node);
980
981 /* Update host time counters and remove stale entries */
982 for (bucket = 0; bucket < priv->numBuckets; bucket++) {
983 struct ng_bridge_hent **hptr = &SLIST_FIRST(&priv->tab[bucket]);
984
985 while (*hptr != NULL) {
986 struct ng_bridge_hent *const hent = *hptr;
987
988 /* Make sure host's link really exists */
989 KASSERT(priv->links[hent->host.linkNum] != NULL,
990 ("%s: host %6D on nonexistent link %d\n",
991 __func__, hent->host.addr, ":",
992 hent->host.linkNum));
993
994 /* Remove hosts we haven't heard from in a while */
995 if (++hent->host.staleness >= priv->conf.maxStaleness) {
996 *hptr = SLIST_NEXT(hent, next);
997 FREE(hent, M_NETGRAPH_BRIDGE);
998 priv->numHosts--;
999 } else {
1000 if (hent->host.age < 0xffff)
1001 hent->host.age++;
1002 hptr = &SLIST_NEXT(hent, next);
1003 counter++;
1004 }
1005 }
1006 }
1007 KASSERT(priv->numHosts == counter,
1008 ("%s: hosts: %d != %d", __func__, priv->numHosts, counter));
1009
1010 /* Decrease table size if necessary */
1011 ng_bridge_rehash(priv);
1012
1013 /* Decrease loop counter on muted looped back links */
1014 for (counter = linkNum = 0; linkNum < NG_BRIDGE_MAX_LINKS; linkNum++) {
1015 struct ng_bridge_link *const link = priv->links[linkNum];
1016
1017 if (link != NULL) {
1018 if (link->loopCount != 0) {
1019 link->loopCount--;
1020 if (link->loopCount == 0
1021 && priv->conf.debugLevel >= 2) {
1022 log(LOG_INFO, "ng_bridge: %s:"
1023 " restoring looped back link%d\n",
1024 ng_bridge_nodename(node), linkNum);
1025 }
1026 }
1027 counter++;
1028 }
1029 }
1030 KASSERT(priv->numLinks == counter,
1031 ("%s: links: %d != %d", __func__, priv->numLinks, counter));
1032
1033 /* Done */
1034 splx(s);
1035}
1036
1037/*
1038 * Return node's "name", even if it doesn't have one.
1039 */
1040static const char *
1041ng_bridge_nodename(node_p node)
1042{
1043 static char name[NG_NODESIZ];
1044
1045 if (NG_NODE_NAME(node) != NULL)
1046 snprintf(name, sizeof(name), "%s", NG_NODE_NAME(node));
1047 else
1048 snprintf(name, sizeof(name), "[%x]", ng_node2ID(node));
1049 return name;
1050}
1051
|