summaryrefslogtreecommitdiffstats
path: root/sys/netgraph/ng_one2many.c
blob: 927bb77a99c1d8b2ecb7697179f9593b482d611b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561

/*
 * ng_one2many.c
 *
 * Copyright (c) 2000 Whistle Communications, Inc.
 * All rights reserved.
 * 
 * Subject to the following obligations and disclaimer of warranty, use and
 * redistribution of this software, in source or object code forms, with or
 * without modifications are expressly permitted by Whistle Communications;
 * provided, however, that:
 * 1. Any and all reproductions of the source or object code must include the
 *    copyright notice above and the following disclaimer of warranties; and
 * 2. No rights are granted, in any manner or form, to use Whistle
 *    Communications, Inc. trademarks, including the mark "WHISTLE
 *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
 *    such appears in the above copyright notice or in the software.
 * 
 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * Author: Archie Cobbs <archie@freebsd.org>
 *
 * $FreeBSD$
 */

/*
 * ng_one2many(4) netgraph node type
 *
 * Packets received on the "one" hook are sent out each of the
 * "many" hooks accoring to an algorithm. Packets received on any
 * "many" hook are always delivered to the "one" hook.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/ctype.h>
#include <sys/mbuf.h>
#include <sys/errno.h>

#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/ng_parse.h>
#include <netgraph/ng_one2many.h>

/* Per-link private data */
struct ng_one2many_link {
	hook_p				hook;	/* netgraph hook */
	struct ng_one2many_link_stats	stats;	/* link stats */
};

/* Per-node private data */
struct ng_one2many_private {
	struct ng_one2many_config	conf;		/* node configuration */
	struct ng_one2many_link		one;		/* "one" hook */
	struct ng_one2many_link		many[NG_ONE2MANY_MAX_LINKS];
	u_int16_t			nextMany;	/* next round-robin */
	u_int16_t			numActiveMany;	/* # active "many" */
	u_int16_t			activeMany[NG_ONE2MANY_MAX_LINKS];
};
typedef struct ng_one2many_private *priv_p;

/* Netgraph node methods */
static ng_constructor_t	ng_one2many_constructor;
static ng_rcvmsg_t	ng_one2many_rcvmsg;
static ng_shutdown_t	ng_one2many_shutdown;
static ng_newhook_t	ng_one2many_newhook;
static ng_rcvdata_t	ng_one2many_rcvdata;
static ng_disconnect_t	ng_one2many_disconnect;

/* Other functions */
static void		ng_one2many_update_many(priv_p priv);

/* Store each hook's link number in the private field */
#define LINK_NUM(hook)		(*(int16_t *)(&(hook)->private))

/******************************************************************
		    NETGRAPH PARSE TYPES
******************************************************************/

/* Parse type for struct ng_one2many_config */
static const struct ng_parse_fixedarray_info
    ng_one2many_enableLinks_array_type_info = {
	&ng_parse_uint8_type,
	NG_ONE2MANY_MAX_LINKS
};
static const struct ng_parse_type ng_one2many_enableLinks_array_type = {
	&ng_parse_fixedarray_type,
	&ng_one2many_enableLinks_array_type_info,
};
static const struct ng_parse_struct_field ng_one2many_config_type_fields[]
	= NG_ONE2MANY_CONFIG_TYPE_INFO(&ng_one2many_enableLinks_array_type);
static const struct ng_parse_type ng_one2many_config_type = {
	&ng_parse_struct_type,
	&ng_one2many_config_type_fields
};

/* Parse type for struct ng_one2many_link_stats */
static const struct ng_parse_struct_field ng_one2many_link_stats_type_fields[]
	= NG_ONE2MANY_LINK_STATS_TYPE_INFO;
static const struct ng_parse_type ng_one2many_link_stats_type = {
	&ng_parse_struct_type,
	&ng_one2many_link_stats_type_fields
};

/* List of commands and how to convert arguments to/from ASCII */
static const struct ng_cmdlist ng_one2many_cmdlist[] = {
	{
	  NGM_ONE2MANY_COOKIE,
	  NGM_ONE2MANY_SET_CONFIG,
	  "setconfig",
	  &ng_one2many_config_type,
	  NULL
	},
	{
	  NGM_ONE2MANY_COOKIE,
	  NGM_ONE2MANY_GET_CONFIG,
	  "getconfig",
	  NULL,
	  &ng_one2many_config_type
	},
	{
	  NGM_ONE2MANY_COOKIE,
	  NGM_ONE2MANY_GET_STATS,
	  "getstats",
	  &ng_parse_int32_type,
	  &ng_one2many_link_stats_type
	},
	{
	  NGM_ONE2MANY_COOKIE,
	  NGM_ONE2MANY_CLR_STATS,
	  "clrstats",
	  &ng_parse_int32_type,
	  NULL,
	},
	{
	  NGM_ONE2MANY_COOKIE,
	  NGM_ONE2MANY_GETCLR_STATS,
	  "getclrstats",
	  &ng_parse_int32_type,
	  &ng_one2many_link_stats_type
	},
	{ 0 }
};

/* Node type descriptor */
static struct ng_type ng_one2many_typestruct = {
	NG_ABI_VERSION,
	NG_ONE2MANY_NODE_TYPE,
	NULL,
	ng_one2many_constructor,
	ng_one2many_rcvmsg,
	ng_one2many_shutdown,
	ng_one2many_newhook,
	NULL,
	NULL,
	ng_one2many_rcvdata,
	ng_one2many_disconnect,
	ng_one2many_cmdlist,
};
NETGRAPH_INIT(one2many, &ng_one2many_typestruct);

/******************************************************************
		    NETGRAPH NODE METHODS
******************************************************************/

/*
 * Node constructor
 */
static int
ng_one2many_constructor(node_p node)
{
	priv_p priv;

	/* Allocate and initialize private info */
	MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
	if (priv == NULL)
		return (ENOMEM);
	priv->conf.xmitAlg = NG_ONE2MANY_XMIT_ROUNDROBIN;
	priv->conf.failAlg = NG_ONE2MANY_FAIL_MANUAL;

	NG_NODE_SET_PRIVATE(node, priv);

	/* Done */
	return (0);
}

/*
 * Method for attaching a new hook
 */
static	int
ng_one2many_newhook(node_p node, hook_p hook, const char *name)
{
	const priv_p priv = NG_NODE_PRIVATE(node);
	struct ng_one2many_link *link;
	int linkNum;
	u_long i;

	/* Which hook? */
	if (strncmp(name, NG_ONE2MANY_HOOK_MANY_PREFIX,
	    strlen(NG_ONE2MANY_HOOK_MANY_PREFIX)) == 0) {
		const char *cp;
		char *eptr;

		cp = name + strlen(NG_ONE2MANY_HOOK_MANY_PREFIX);
		if (!isdigit(*cp) || (cp[0] == '0' && cp[1] != '\0'))
			return (EINVAL);
		i = strtoul(cp, &eptr, 10);
		if (*eptr != '\0' || i < 0 || i >= NG_ONE2MANY_MAX_LINKS)
			return (EINVAL);
		linkNum = (int)i;
		link = &priv->many[linkNum];
	} else if (strcmp(name, NG_ONE2MANY_HOOK_ONE) == 0) {
		linkNum = NG_ONE2MANY_ONE_LINKNUM;
		link = &priv->one;
	} else
		return (EINVAL);

	/* Is hook already connected? (should never happen) */
	if (link->hook != NULL)
		return (EISCONN);

	/* Setup private info for this link */
	NG_HOOK_SET_PRIVATE(hook, (void *)(intptr_t)linkNum);
	link->hook = hook;
	bzero(&link->stats, sizeof(link->stats));
	if (linkNum != NG_ONE2MANY_ONE_LINKNUM) {
		priv->conf.enabledLinks[linkNum] = 1;	/* auto-enable link */
		ng_one2many_update_many(priv);
	}

	/* Done */
	return (0);
}

/*
 * Receive a control message
 */
static int
ng_one2many_rcvmsg(node_p node, item_p item, hook_p lasthook)
{
	const priv_p priv = NG_NODE_PRIVATE(node);
	struct ng_mesg *resp = NULL;
	int error = 0;
	struct ng_mesg *msg;

	NGI_GET_MSG(item, msg);
	switch (msg->header.typecookie) {
	case NGM_ONE2MANY_COOKIE:
		switch (msg->header.cmd) {
		case NGM_ONE2MANY_SET_CONFIG:
		    {
			struct ng_one2many_config *conf;
			int i;

			/* Check that new configuration is valid */
			if (msg->header.arglen != sizeof(*conf)) {
				error = EINVAL;
				break;
			}
			conf = (struct ng_one2many_config *)msg->data;
			switch (conf->xmitAlg) {
			case NG_ONE2MANY_XMIT_ROUNDROBIN:
			case NG_ONE2MANY_XMIT_ALL:
				break;
			default:
				error = EINVAL;
				break;
			}
			switch (conf->failAlg) {
			case NG_ONE2MANY_FAIL_MANUAL:
				break;
			default:
				error = EINVAL;
				break;
			}
			if (error != 0)
				break;

			/* Normalized many link enabled bits */ 
			for (i = 0; i < NG_ONE2MANY_MAX_LINKS; i++)
				conf->enabledLinks[i] = !!conf->enabledLinks[i];

			/* Copy config and reset */
			bcopy(conf, &priv->conf, sizeof(*conf));
			ng_one2many_update_many(priv);
			break;
		    }
		case NGM_ONE2MANY_GET_CONFIG:
		    {
			struct ng_one2many_config *conf;

			NG_MKRESPONSE(resp, msg, sizeof(*conf), M_NOWAIT);
			if (resp == NULL) {
				error = ENOMEM;
				break;
			}
			conf = (struct ng_one2many_config *)resp->data;
			bcopy(&priv->conf, conf, sizeof(priv->conf));
			break;
		    }
		case NGM_ONE2MANY_GET_STATS:
		case NGM_ONE2MANY_CLR_STATS:
		case NGM_ONE2MANY_GETCLR_STATS:
		    {
			struct ng_one2many_link *link;
			int linkNum;

			/* Get link */
			if (msg->header.arglen != sizeof(int32_t)) {
				error = EINVAL;
				break;
			}
			linkNum = *((int32_t *)msg->data);
			if (linkNum == NG_ONE2MANY_ONE_LINKNUM)
				link = &priv->one;
			else if (linkNum == 0
			    && linkNum < NG_ONE2MANY_MAX_LINKS) {
				link = &priv->many[linkNum];
			} else {
				error = EINVAL;
				break;
			}

			/* Get/clear stats */
			if (msg->header.cmd != NGM_ONE2MANY_CLR_STATS) {
				NG_MKRESPONSE(resp, msg,
				    sizeof(link->stats), M_NOWAIT);
				if (resp == NULL) {
					error = ENOMEM;
					break;
				}
				bcopy(&link->stats,
				    resp->data, sizeof(link->stats));
			}
			if (msg->header.cmd != NGM_ONE2MANY_GET_STATS)
				bzero(&link->stats, sizeof(link->stats));
			break;
		    }
		default:
			error = EINVAL;
			break;
		}
		break;
	default:
		error = EINVAL;
		break;
	}

	/* Done */
	NG_RESPOND_MSG(error, node, item, resp);
	NG_FREE_MSG(msg);
	return (error);
}

/*
 * Receive data on a hook
 */
static int
ng_one2many_rcvdata(hook_p hook, item_p item)
{
	const node_p node = NG_HOOK_NODE(hook);
	const priv_p priv = NG_NODE_PRIVATE(node);
	struct ng_one2many_link *src;
	struct ng_one2many_link *dst = NULL;
	int error = 0;
	int linkNum;
	int i;
	struct mbuf *m;
	meta_p meta;

	m = NGI_M(item); /* just peaking, mbuf still owned by item */
	/* Get link number */
	linkNum = (intptr_t)NG_HOOK_PRIVATE(hook);
	KASSERT(linkNum == NG_ONE2MANY_ONE_LINKNUM
	    || (linkNum >= 0 && linkNum < NG_ONE2MANY_MAX_LINKS),
	    ("%s: linkNum=%d", __func__, linkNum));

	/* Figure out source link */
	src = (linkNum == NG_ONE2MANY_ONE_LINKNUM) ?
	    &priv->one : &priv->many[linkNum];
	KASSERT(src->hook != NULL, ("%s: no src%d", __func__, linkNum));

	/* Update receive stats */
	src->stats.recvPackets++;
	src->stats.recvOctets += m->m_pkthdr.len;

	/* Figure out destination link */
	if (linkNum == NG_ONE2MANY_ONE_LINKNUM) {
		if (priv->numActiveMany == 0) {
			NG_FREE_ITEM(item);
			return (ENOTCONN);
		}
		switch(priv->conf.xmitAlg) {
		case NG_ONE2MANY_XMIT_ROUNDROBIN:
			dst = &priv->many[priv->activeMany[priv->nextMany]];
			priv->nextMany = (priv->nextMany + 1) % priv->numActiveMany;
			break;
		case NG_ONE2MANY_XMIT_ALL:
			meta = NGI_META(item); /* peek.. */
			/* no need to copy data for the 1st one */
			dst = &priv->many[priv->activeMany[0]];

			/* make copies of data and send for all links
			 * except the first one, which we'll do last 
			 */
			for (i = 1; i < priv->numActiveMany; i++) {
				meta_p meta2 = NULL;
				struct mbuf *m2;
				struct ng_one2many_link *mdst;

				mdst = &priv->many[priv->activeMany[i]];
				m2 = m_dup(m, M_DONTWAIT);        /* XXX m_copypacket() */
				if (m2 == NULL) {
					mdst->stats.memoryFailures++;
					NG_FREE_ITEM(item);
					NG_FREE_M(m);
					return (ENOBUFS);
				}
				if (meta != NULL
				    && (meta2 = ng_copy_meta(meta)) == NULL) {
					mdst->stats.memoryFailures++;
					m_freem(m2);
					NG_FREE_ITEM(item);
					NG_FREE_M(m);
					return (ENOMEM);
				}
				/* Update transmit stats */
				mdst->stats.xmitPackets++;
				mdst->stats.xmitOctets += m->m_pkthdr.len;
				NG_SEND_DATA(error, mdst->hook, m2, meta2);
			}
			break;
#ifdef INVARIANTS
		default:
			panic("%s: invalid xmitAlg", __func__);
#endif
		}
	} else {
		dst = &priv->one;
	}

	/* Update transmit stats */
	dst->stats.xmitPackets++;
	dst->stats.xmitOctets += m->m_pkthdr.len;

	/* Deliver packet */
	NG_FWD_ITEM_HOOK(error, item, dst->hook);
	return (error);
}

/*
 * Shutdown node
 */
static int
ng_one2many_shutdown(node_p node)
{
	const priv_p priv = NG_NODE_PRIVATE(node);

	KASSERT(priv->numActiveMany == 0,
	    ("%s: numActiveMany=%d", __func__, priv->numActiveMany));
	FREE(priv, M_NETGRAPH);
	NG_NODE_SET_PRIVATE(node, NULL);
	NG_NODE_UNREF(node);
	return (0);
}

/*
 * Hook disconnection.
 */
static int
ng_one2many_disconnect(hook_p hook)
{
	const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
	int linkNum;

	/* Get link number */
	linkNum = (intptr_t)NG_HOOK_PRIVATE(hook);
	KASSERT(linkNum == NG_ONE2MANY_ONE_LINKNUM
	    || (linkNum >= 0 && linkNum < NG_ONE2MANY_MAX_LINKS),
	    ("%s: linkNum=%d", __func__, linkNum));

	/* Nuke the link */
	if (linkNum == NG_ONE2MANY_ONE_LINKNUM)
		priv->one.hook = NULL;
	else {
		priv->many[linkNum].hook = NULL;
		priv->conf.enabledLinks[linkNum] = 0;
		ng_one2many_update_many(priv);
	}

	/* If no hooks left, go away */
	if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
	&& (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
		ng_rmnode_self(NG_HOOK_NODE(hook));
	return (0);
}

/******************************************************************
		    	OTHER FUNCTIONS
******************************************************************/

/*
 * Update internal state after the addition or removal of a "many" link
 */
static void
ng_one2many_update_many(priv_p priv)
{
	int linkNum;

	/* Update list of which "many" links are up */
	priv->numActiveMany = 0;
	for (linkNum = 0; linkNum < NG_ONE2MANY_MAX_LINKS; linkNum++) {
		switch (priv->conf.failAlg) {
		case NG_ONE2MANY_FAIL_MANUAL:
			if (priv->many[linkNum].hook != NULL
			    && priv->conf.enabledLinks[linkNum]) {
				priv->activeMany[priv->numActiveMany] = linkNum;
				priv->numActiveMany++;
			}
			break;
#ifdef INVARIANTS
		default:
			panic("%s: invalid failAlg", __func__);
#endif
		}
	}

	/* Update transmit algorithm state */
	switch (priv->conf.xmitAlg) {
	case NG_ONE2MANY_XMIT_ROUNDROBIN:
		if (priv->numActiveMany > 0)
			priv->nextMany %= priv->numActiveMany;
		break;
	case NG_ONE2MANY_XMIT_ALL:
		break;
#ifdef INVARIANTS
	default:
		panic("%s: invalid xmitAlg", __func__);
#endif
	}
}


OpenPOWER on IntegriCloud