kernel/netgraph7: Use kether_ntoa().
[dragonfly.git] / sys / netgraph7 / bridge / ng_bridge.c
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1/*
2 * ng_bridge.c
3 */
4
5/*-
6 * Copyright (c) 2000 Whistle Communications, Inc.
7 * All rights reserved.
8 *
9 * Subject to the following obligations and disclaimer of warranty, use and
10 * redistribution of this software, in source or object code forms, with or
11 * without modifications are expressly permitted by Whistle Communications;
12 * provided, however, that:
13 * 1. Any and all reproductions of the source or object code must include the
14 * copyright notice above and the following disclaimer of warranties; and
15 * 2. No rights are granted, in any manner or form, to use Whistle
16 * Communications, Inc. trademarks, including the mark "WHISTLE
17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
18 * such appears in the above copyright notice or in the software.
19 *
20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
36 * OF SUCH DAMAGE.
37 *
38 * Author: Archie Cobbs <archie@freebsd.org>
39 *
40 * $FreeBSD: src/sys/netgraph/ng_bridge.c,v 1.31 2005/02/09 15:14:44 ru Exp $
41 */
42
43/*
44 * ng_bridge(4) netgraph node type
45 *
46 * The node performs standard intelligent Ethernet bridging over
47 * each of its connected hooks, or links. A simple loop detection
48 * algorithm is included which disables a link for priv->conf.loopTimeout
49 * seconds when a host is seen to have jumped from one link to
50 * another within priv->conf.minStableAge seconds.
51 *
52 * We keep a hashtable that maps Ethernet addresses to host info,
53 * which is contained in struct ng_bridge_host's. These structures
54 * tell us on which link the host may be found. A host's entry will
55 * expire after priv->conf.maxStaleness seconds.
56 *
57 * This node is optimzed for stable networks, where machines jump
58 * from one port to the other only rarely.
59 */
60
61#include <sys/param.h>
62#include <sys/systm.h>
63#include <sys/kernel.h>
64#include <sys/malloc.h>
65#include <sys/mbuf.h>
66#include <sys/errno.h>
67#include <sys/syslog.h>
68#include <sys/socket.h>
69#include <sys/ctype.h>
70
71#include <net/if.h>
72#include <net/ethernet.h>
73
74#include <netinet/in.h>
512a0173 75#include <net/ipfw/ip_fw.h>
b06ebda0 76
512a0173
NA
77#include <netgraph7/ng_message.h>
78#include <netgraph7/netgraph.h>
79#include <netgraph7/ng_parse.h>
5a975a3d 80#include "ng_bridge.h"
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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(node_p node, hook_p hook, void *arg1, int arg2);
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[]
175 = 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 .version = NG_ABI_VERSION,
276 .name = NG_BRIDGE_NODE_TYPE,
277 .constructor = ng_bridge_constructor,
278 .rcvmsg = ng_bridge_rcvmsg,
279 .shutdown = ng_bridge_shutdown,
280 .newhook = ng_bridge_newhook,
281 .rcvdata = ng_bridge_rcvdata,
282 .disconnect = ng_bridge_disconnect,
283 .cmdlist = ng_bridge_cmdlist,
284};
285NETGRAPH_INIT(bridge, &ng_bridge_typestruct);
286
287/******************************************************************
288 NETGRAPH NODE METHODS
289******************************************************************/
290
291/*
292 * Node constructor
293 */
294static int
295ng_bridge_constructor(node_p node)
296{
297 priv_p priv;
298
299 /* Allocate and initialize private info */
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300 priv = kmalloc(sizeof(*priv), M_NETGRAPH_BRIDGE,
301 M_WAITOK | M_NULLOK | M_ZERO);
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302 if (priv == NULL)
303 return (ENOMEM);
304 ng_callout_init(&priv->timer);
305
306 /* Allocate and initialize hash table, etc. */
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307 priv->tab = kmalloc(MIN_BUCKETS * sizeof(*priv->tab),
308 M_NETGRAPH_BRIDGE, M_WAITOK | M_NULLOK | M_ZERO);
b06ebda0 309 if (priv->tab == NULL) {
fc025606 310 kfree(priv, M_NETGRAPH_BRIDGE);
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311 return (ENOMEM);
312 }
313 priv->numBuckets = MIN_BUCKETS;
314 priv->hashMask = MIN_BUCKETS - 1;
315 priv->conf.debugLevel = 1;
316 priv->conf.loopTimeout = DEFAULT_LOOP_TIMEOUT;
317 priv->conf.maxStaleness = DEFAULT_MAX_STALENESS;
318 priv->conf.minStableAge = DEFAULT_MIN_STABLE_AGE;
319
320 /*
321 * This node has all kinds of stuff that could be screwed by SMP.
322 * Until it gets it's own internal protection, we go through in
323 * single file. This could hurt a machine bridging beteen two
324 * GB ethernets so it should be fixed.
325 * When it's fixed the process SHOULD NOT SLEEP, spinlocks please!
326 * (and atomic ops )
327 */
328 NG_NODE_FORCE_WRITER(node);
329 NG_NODE_SET_PRIVATE(node, priv);
330 priv->node = node;
331
332 /* Start timer; timer is always running while node is alive */
333 ng_callout(&priv->timer, node, NULL, hz, ng_bridge_timeout, NULL, 0);
334
335 /* Done */
336 return (0);
337}
338
339/*
340 * Method for attaching a new hook
341 */
342static int
343ng_bridge_newhook(node_p node, hook_p hook, const char *name)
344{
345 const priv_p priv = NG_NODE_PRIVATE(node);
346
347 /* Check for a link hook */
348 if (strncmp(name, NG_BRIDGE_HOOK_LINK_PREFIX,
349 strlen(NG_BRIDGE_HOOK_LINK_PREFIX)) == 0) {
350 const char *cp;
351 char *eptr;
352 u_long linkNum;
353
354 cp = name + strlen(NG_BRIDGE_HOOK_LINK_PREFIX);
355 if (!isdigit(*cp) || (cp[0] == '0' && cp[1] != '\0'))
356 return (EINVAL);
357 linkNum = strtoul(cp, &eptr, 10);
358 if (*eptr != '\0' || linkNum >= NG_BRIDGE_MAX_LINKS)
359 return (EINVAL);
360 if (priv->links[linkNum] != NULL)
361 return (EISCONN);
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362 priv->links[linkNum] = kmalloc(sizeof(*priv->links[linkNum]),
363 M_NETGRAPH_BRIDGE,
364 M_WAITOK | M_NULLOK | M_ZERO);
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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,
5a975a3d 397 sizeof(struct ng_bridge_config), M_WAITOK | M_NULLOK);
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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,
5a975a3d 464 sizeof(link->stats), M_WAITOK | M_NULLOK);
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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)
5a975a3d 483 + (priv->numHosts * sizeof(*ary->hosts)), M_WAITOK | M_NULLOK);
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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, linksSeen;
524 int manycast;
525 struct mbuf *m;
526 struct ng_bridge_link *firstLink;
527
528 NGI_GET_M(item, m);
529 /* Get link number */
530 linkNum = (intptr_t)NG_HOOK_PRIVATE(hook);
531 KASSERT(linkNum >= 0 && linkNum < NG_BRIDGE_MAX_LINKS,
532 ("%s: linkNum=%u", __func__, linkNum));
533 link = priv->links[linkNum];
534 KASSERT(link != NULL, ("%s: link%d null", __func__, linkNum));
535
536 /* Sanity check packet and pull up header */
537 if (m->m_pkthdr.len < ETHER_HDR_LEN) {
538 link->stats.recvRunts++;
539 NG_FREE_ITEM(item);
540 NG_FREE_M(m);
541 return (EINVAL);
542 }
543 if (m->m_len < ETHER_HDR_LEN && !(m = m_pullup(m, ETHER_HDR_LEN))) {
544 link->stats.memoryFailures++;
545 NG_FREE_ITEM(item);
546 return (ENOBUFS);
547 }
548 eh = mtod(m, struct ether_header *);
549 if ((eh->ether_shost[0] & 1) != 0) {
550 link->stats.recvInvalid++;
551 NG_FREE_ITEM(item);
552 NG_FREE_M(m);
553 return (EINVAL);
554 }
555
556 /* Is link disabled due to a loopback condition? */
557 if (link->loopCount != 0) {
558 link->stats.loopDrops++;
559 NG_FREE_ITEM(item);
560 NG_FREE_M(m);
561 return (ELOOP); /* XXX is this an appropriate error? */
562 }
563
564 /* Update stats */
565 link->stats.recvPackets++;
566 link->stats.recvOctets += m->m_pkthdr.len;
567 if ((manycast = (eh->ether_dhost[0] & 1)) != 0) {
568 if (ETHER_EQUAL(eh->ether_dhost, ng_bridge_bcast_addr)) {
569 link->stats.recvBroadcasts++;
570 manycast = 2;
571 } else
572 link->stats.recvMulticasts++;
573 }
574
575 /* Look up packet's source Ethernet address in hashtable */
576 if ((host = ng_bridge_get(priv, eh->ether_shost)) != NULL) {
577
578 /* Update time since last heard from this host */
579 host->staleness = 0;
580
581 /* Did host jump to a different link? */
582 if (host->linkNum != linkNum) {
583
584 /*
585 * If the host's old link was recently established
586 * on the old link and it's already jumped to a new
587 * link, declare a loopback condition.
588 */
589 if (host->age < priv->conf.minStableAge) {
590
591 /* Log the problem */
592 if (priv->conf.debugLevel >= 2) {
593 struct ifnet *ifp = m->m_pkthdr.rcvif;
594 char suffix[32];
595
596 if (ifp != NULL)
597 snprintf(suffix, sizeof(suffix),
598 " (%s)", ifp->if_xname);
599 else
600 *suffix = '\0';
601 log(LOG_WARNING, "ng_bridge: %s:"
602 " loopback detected on %s%s\n",
603 ng_bridge_nodename(node),
604 NG_HOOK_NAME(hook), suffix);
605 }
606
607 /* Mark link as linka non grata */
608 link->loopCount = priv->conf.loopTimeout;
609 link->stats.loopDetects++;
610
611 /* Forget all hosts on this link */
612 ng_bridge_remove_hosts(priv, linkNum);
613
614 /* Drop packet */
615 link->stats.loopDrops++;
616 NG_FREE_ITEM(item);
617 NG_FREE_M(m);
618 return (ELOOP); /* XXX appropriate? */
619 }
620
621 /* Move host over to new link */
622 host->linkNum = linkNum;
623 host->age = 0;
624 }
625 } else {
626 if (!ng_bridge_put(priv, eh->ether_shost, linkNum)) {
627 link->stats.memoryFailures++;
628 NG_FREE_ITEM(item);
629 NG_FREE_M(m);
630 return (ENOMEM);
631 }
632 }
633
634 /* Run packet through ipfw processing, if enabled */
635#if 0
636 if (priv->conf.ipfw[linkNum] && fw_enable && ip_fw_chk_ptr != NULL) {
637 /* XXX not implemented yet */
638 }
639#endif
640
641 /*
642 * If unicast and destination host known, deliver to host's link,
643 * unless it is the same link as the packet came in on.
644 */
645 if (!manycast) {
646
647 /* Determine packet destination link */
648 if ((host = ng_bridge_get(priv, eh->ether_dhost)) != NULL) {
649 struct ng_bridge_link *const destLink
650 = priv->links[host->linkNum];
651
652 /* If destination same as incoming link, do nothing */
653 KASSERT(destLink != NULL,
654 ("%s: link%d null", __func__, host->linkNum));
655 if (destLink == link) {
656 NG_FREE_ITEM(item);
657 NG_FREE_M(m);
658 return (0);
659 }
660
661 /* Deliver packet out the destination link */
662 destLink->stats.xmitPackets++;
663 destLink->stats.xmitOctets += m->m_pkthdr.len;
664 NG_FWD_NEW_DATA(error, item, destLink->hook, m);
665 return (error);
666 }
667
668 /* Destination host is not known */
669 link->stats.recvUnknown++;
670 }
671
672 /* Distribute unknown, multicast, broadcast pkts to all other links */
673 firstLink = NULL;
674 for (linkNum = linksSeen = 0; linksSeen <= priv->numLinks; linkNum++) {
675 struct ng_bridge_link *destLink;
676 struct mbuf *m2 = NULL;
677
678 /*
679 * If we have checked all the links then now
680 * send the original on its reserved link
681 */
682 if (linksSeen == priv->numLinks) {
683 /* If we never saw a good link, leave. */
684 if (firstLink == NULL) {
685 NG_FREE_ITEM(item);
686 NG_FREE_M(m);
687 return (0);
688 }
689 destLink = firstLink;
690 } else {
691 destLink = priv->links[linkNum];
692 if (destLink != NULL)
693 linksSeen++;
694 /* Skip incoming link and disconnected links */
695 if (destLink == NULL || destLink == link) {
696 continue;
697 }
698 if (firstLink == NULL) {
699 /*
700 * This is the first usable link we have found.
701 * Reserve it for the originals.
702 * If we never find another we save a copy.
703 */
704 firstLink = destLink;
705 continue;
706 }
707
708 /*
709 * It's usable link but not the reserved (first) one.
710 * Copy mbuf info for sending.
711 */
5a975a3d 712 m2 = m_dup(m, MB_DONTWAIT); /* XXX m_copypacket() */
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713 if (m2 == NULL) {
714 link->stats.memoryFailures++;
715 NG_FREE_ITEM(item);
716 NG_FREE_M(m);
717 return (ENOBUFS);
718 }
719 }
720
721 /* Update stats */
722 destLink->stats.xmitPackets++;
723 destLink->stats.xmitOctets += m->m_pkthdr.len;
724 switch (manycast) {
725 case 0: /* unicast */
726 break;
727 case 1: /* multicast */
728 destLink->stats.xmitMulticasts++;
729 break;
730 case 2: /* broadcast */
731 destLink->stats.xmitBroadcasts++;
732 break;
733 }
734
735 /* Send packet */
736 if (destLink == firstLink) {
737 /*
738 * If we've sent all the others, send the original
739 * on the first link we found.
740 */
741 NG_FWD_NEW_DATA(error, item, destLink->hook, m);
742 break; /* always done last - not really needed. */
743 } else {
744 NG_SEND_DATA_ONLY(error, destLink->hook, m2);
745 }
746 }
747 return (error);
748}
749
750/*
751 * Shutdown node
752 */
753static int
754ng_bridge_shutdown(node_p node)
755{
756 const priv_p priv = NG_NODE_PRIVATE(node);
757
758 /*
759 * Shut down everything including the timer. Even if the
760 * callout has already been dequeued and is about to be
761 * run, ng_bridge_timeout() won't be fired as the node
762 * is already marked NGF_INVALID, so we're safe to free
763 * the node now.
764 */
765 KASSERT(priv->numLinks == 0 && priv->numHosts == 0,
766 ("%s: numLinks=%d numHosts=%d",
767 __func__, priv->numLinks, priv->numHosts));
768 ng_uncallout(&priv->timer, node);
769 NG_NODE_SET_PRIVATE(node, NULL);
770 NG_NODE_UNREF(node);
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771 kfree(priv->tab, M_NETGRAPH_BRIDGE);
772 kfree(priv, M_NETGRAPH_BRIDGE);
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773 return (0);
774}
775
776/*
777 * Hook disconnection.
778 */
779static int
780ng_bridge_disconnect(hook_p hook)
781{
782 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
783 int linkNum;
784
785 /* Get link number */
786 linkNum = (intptr_t)NG_HOOK_PRIVATE(hook);
787 KASSERT(linkNum >= 0 && linkNum < NG_BRIDGE_MAX_LINKS,
788 ("%s: linkNum=%u", __func__, linkNum));
789
790 /* Remove all hosts associated with this link */
791 ng_bridge_remove_hosts(priv, linkNum);
792
793 /* Free associated link information */
794 KASSERT(priv->links[linkNum] != NULL, ("%s: no link", __func__));
fc025606 795 kfree(priv->links[linkNum], M_NETGRAPH_BRIDGE);
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796 priv->links[linkNum] = NULL;
797 priv->numLinks--;
798
799 /* If no more hooks, go away */
800 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
801 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
802 ng_rmnode_self(NG_HOOK_NODE(hook));
803 }
804 return (0);
805}
806
807/******************************************************************
808 HASH TABLE FUNCTIONS
809******************************************************************/
810
811/*
812 * Hash algorithm
813 */
814#define HASH(addr,mask) ( (((const u_int16_t *)(addr))[0] \
815 ^ ((const u_int16_t *)(addr))[1] \
816 ^ ((const u_int16_t *)(addr))[2]) & (mask) )
817
818/*
819 * Find a host entry in the table.
820 */
821static struct ng_bridge_host *
822ng_bridge_get(priv_p priv, const u_char *addr)
823{
824 const int bucket = HASH(addr, priv->hashMask);
825 struct ng_bridge_hent *hent;
826
827 SLIST_FOREACH(hent, &priv->tab[bucket], next) {
828 if (ETHER_EQUAL(hent->host.addr, addr))
829 return (&hent->host);
830 }
831 return (NULL);
832}
833
834/*
835 * Add a new host entry to the table. This assumes the host doesn't
836 * already exist in the table. Returns 1 on success, 0 if there
837 * was a memory allocation failure.
838 */
839static int
840ng_bridge_put(priv_p priv, const u_char *addr, int linkNum)
841{
842 const int bucket = HASH(addr, priv->hashMask);
843 struct ng_bridge_hent *hent;
18748015 844 char ethstr[ETHER_ADDRSTRLEN + 1] __debugvar;
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845
846#ifdef INVARIANTS
847 /* Assert that entry does not already exist in hashtable */
848 SLIST_FOREACH(hent, &priv->tab[bucket], next) {
849 KASSERT(!ETHER_EQUAL(hent->host.addr, addr),
18748015 850 ("%s: entry %s exists in table", __func__, kether_ntoa(addr, ethstr)));
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851 }
852#endif
853
854 /* Allocate and initialize new hashtable entry */
fc025606 855 hent = kmalloc(sizeof(*hent), M_NETGRAPH_BRIDGE, M_WAITOK | M_NULLOK);
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856 if (hent == NULL)
857 return (0);
858 bcopy(addr, hent->host.addr, ETHER_ADDR_LEN);
859 hent->host.linkNum = linkNum;
860 hent->host.staleness = 0;
861 hent->host.age = 0;
862
863 /* Add new element to hash bucket */
864 SLIST_INSERT_HEAD(&priv->tab[bucket], hent, next);
865 priv->numHosts++;
866
867 /* Resize table if necessary */
868 ng_bridge_rehash(priv);
869 return (1);
870}
871
872/*
873 * Resize the hash table. We try to maintain the number of buckets
874 * such that the load factor is in the range 0.25 to 1.0.
875 *
876 * If we can't get the new memory then we silently fail. This is OK
877 * because things will still work and we'll try again soon anyway.
878 */
879static void
880ng_bridge_rehash(priv_p priv)
881{
882 struct ng_bridge_bucket *newTab;
883 int oldBucket, newBucket;
884 int newNumBuckets;
885 u_int newMask;
886
887 /* Is table too full or too empty? */
888 if (priv->numHosts > priv->numBuckets
889 && (priv->numBuckets << 1) <= MAX_BUCKETS)
890 newNumBuckets = priv->numBuckets << 1;
891 else if (priv->numHosts < (priv->numBuckets >> 2)
892 && (priv->numBuckets >> 2) >= MIN_BUCKETS)
893 newNumBuckets = priv->numBuckets >> 2;
894 else
895 return;
896 newMask = newNumBuckets - 1;
897
898 /* Allocate and initialize new table */
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899 newTab = kmalloc(newNumBuckets * sizeof(*newTab), M_NETGRAPH_BRIDGE,
900 M_NOWAIT | M_ZERO);
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901 if (newTab == NULL)
902 return;
903
904 /* Move all entries from old table to new table */
905 for (oldBucket = 0; oldBucket < priv->numBuckets; oldBucket++) {
906 struct ng_bridge_bucket *const oldList = &priv->tab[oldBucket];
907
908 while (!SLIST_EMPTY(oldList)) {
909 struct ng_bridge_hent *const hent
910 = SLIST_FIRST(oldList);
911
912 SLIST_REMOVE_HEAD(oldList, next);
913 newBucket = HASH(hent->host.addr, newMask);
914 SLIST_INSERT_HEAD(&newTab[newBucket], hent, next);
915 }
916 }
917
918 /* Replace old table with new one */
919 if (priv->conf.debugLevel >= 3) {
920 log(LOG_INFO, "ng_bridge: %s: table size %d -> %d\n",
921 ng_bridge_nodename(priv->node),
922 priv->numBuckets, newNumBuckets);
923 }
fc025606 924 kfree(priv->tab, M_NETGRAPH_BRIDGE);
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925 priv->numBuckets = newNumBuckets;
926 priv->hashMask = newMask;
927 priv->tab = newTab;
928 return;
929}
930
931/******************************************************************
932 MISC FUNCTIONS
933******************************************************************/
934
935/*
936 * Remove all hosts associated with a specific link from the hashtable.
937 * If linkNum == -1, then remove all hosts in the table.
938 */
939static void
940ng_bridge_remove_hosts(priv_p priv, int linkNum)
941{
942 int bucket;
943
944 for (bucket = 0; bucket < priv->numBuckets; bucket++) {
945 struct ng_bridge_hent **hptr = &SLIST_FIRST(&priv->tab[bucket]);
946
947 while (*hptr != NULL) {
948 struct ng_bridge_hent *const hent = *hptr;
949
950 if (linkNum == -1 || hent->host.linkNum == linkNum) {
951 *hptr = SLIST_NEXT(hent, next);
fc025606 952 kfree(hent, M_NETGRAPH_BRIDGE);
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953 priv->numHosts--;
954 } else
955 hptr = &SLIST_NEXT(hent, next);
956 }
957 }
958}
959
960/*
961 * Handle our once-per-second timeout event. We do two things:
962 * we decrement link->loopCount for those links being muted due to
963 * a detected loopback condition, and we remove any hosts from
964 * the hashtable whom we haven't heard from in a long while.
965 */
966static void
967ng_bridge_timeout(node_p node, hook_p hook, void *arg1, int arg2)
968{
969 const priv_p priv = NG_NODE_PRIVATE(node);
970 int bucket;
971 int counter = 0;
972 int linkNum;
18748015 973 char ethstr[ETHER_ADDRSTRLEN + 1] __debugvar;
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974
975 /* Update host time counters and remove stale entries */
976 for (bucket = 0; bucket < priv->numBuckets; bucket++) {
977 struct ng_bridge_hent **hptr = &SLIST_FIRST(&priv->tab[bucket]);
978
979 while (*hptr != NULL) {
980 struct ng_bridge_hent *const hent = *hptr;
981
982 /* Make sure host's link really exists */
983 KASSERT(priv->links[hent->host.linkNum] != NULL,
1e290df3 984 ("%s: host %s on nonexistent link %d",
18748015 985 __func__, kether_ntoa(hent->host.addr, ethstr),
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986 hent->host.linkNum));
987
988 /* Remove hosts we haven't heard from in a while */
989 if (++hent->host.staleness >= priv->conf.maxStaleness) {
990 *hptr = SLIST_NEXT(hent, next);
fc025606 991 kfree(hent, M_NETGRAPH_BRIDGE);
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992 priv->numHosts--;
993 } else {
994 if (hent->host.age < 0xffff)
995 hent->host.age++;
996 hptr = &SLIST_NEXT(hent, next);
997 counter++;
998 }
999 }
1000 }
1001 KASSERT(priv->numHosts == counter,
1002 ("%s: hosts: %d != %d", __func__, priv->numHosts, counter));
1003
1004 /* Decrease table size if necessary */
1005 ng_bridge_rehash(priv);
1006
1007 /* Decrease loop counter on muted looped back links */
1008 for (counter = linkNum = 0; linkNum < NG_BRIDGE_MAX_LINKS; linkNum++) {
1009 struct ng_bridge_link *const link = priv->links[linkNum];
1010
1011 if (link != NULL) {
1012 if (link->loopCount != 0) {
1013 link->loopCount--;
1014 if (link->loopCount == 0
1015 && priv->conf.debugLevel >= 2) {
1016 log(LOG_INFO, "ng_bridge: %s:"
1017 " restoring looped back link%d\n",
1018 ng_bridge_nodename(node), linkNum);
1019 }
1020 }
1021 counter++;
1022 }
1023 }
1024 KASSERT(priv->numLinks == counter,
1025 ("%s: links: %d != %d", __func__, priv->numLinks, counter));
1026
1027 /* Register a new timeout, keeping the existing node reference */
1028 ng_callout(&priv->timer, node, NULL, hz, ng_bridge_timeout, NULL, 0);
1029}
1030
1031/*
1032 * Return node's "name", even if it doesn't have one.
1033 */
1034static const char *
1035ng_bridge_nodename(node_p node)
1036{
1037 static char name[NG_NODESIZ];
1038
1039 if (NG_NODE_NAME(node) != NULL)
1040 snprintf(name, sizeof(name), "%s", NG_NODE_NAME(node));
1041 else
1042 snprintf(name, sizeof(name), "[%x]", ng_node2ID(node));
1043 return name;
1044}
1045