summaryrefslogtreecommitdiffstats
path: root/sys/netgraph/ng_source.c
blob: dad819a1d6bb42f995164dea2ae9e6b6623ccd2f (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
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
/*
 * ng_source.c
 */

/*-
 * Copyright (c) 2005 Gleb Smirnoff <glebius@FreeBSD.org>
 * Copyright 2002 Sandvine 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 Sandvine Inc.; 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 Sandvine Inc.
 *    trademarks, including the mark "SANDVINE" on advertising, endorsements,
 *    or otherwise except as such appears in the above copyright notice or in
 *    the software.
 *
 * THIS SOFTWARE IS BEING PROVIDED BY SANDVINE "AS IS", AND TO THE MAXIMUM
 * EXTENT PERMITTED BY LAW, SANDVINE 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.  SANDVINE 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 SANDVINE 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 SANDVINE IS ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 *
 * Author: Dave Chapeskie <dchapeskie@sandvine.com>
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

/*
 * This node is used for high speed packet geneneration.  It queues
 * all data recieved on its 'input' hook and when told to start via
 * a control message it sends the packets out its 'output' hook.  In
 * this way this node can be preloaded with a packet stream which it
 * can then send continuously as fast as possible.
 *
 * Currently it just copies the mbufs as required.  It could do various
 * tricks to try and avoid this.  Probably the best performance would
 * be achieved by modifying the appropriate drivers to be told to
 * self-re-enqueue packets (e.g. the if_bge driver could reuse the same
 * transmit descriptors) under control of this node; perhaps via some
 * flag in the mbuf or some such.  The node could peek at an appropriate
 * ifnet flag to see if such support is available for the connected
 * interface.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <net/if.h>
#include <net/if_var.h>
#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/ng_parse.h>
#include <netgraph/ng_ether.h>
#include <netgraph/ng_source.h>

#define NG_SOURCE_INTR_TICKS		1
#define NG_SOURCE_DRIVER_IFQ_MAXLEN	(4*1024)

#define	mtod_off(m,off,t)	((t)(mtod((m),caddr_t)+(off)))

/* Per node info */
struct privdata {
	node_p				node;
	hook_p				input;
	hook_p				output;
	struct ng_source_stats		stats;
	struct ifqueue			snd_queue;	/* packets to send */
	struct mbuf			*last_packet;	/* last pkt in queue */
	struct ifnet			*output_ifp;
	struct callout			intr_ch;
	uint64_t			packets;	/* packets to send */
	uint32_t			queueOctets;
	struct ng_source_embed_info	embed_timestamp;
	struct ng_source_embed_cnt_info	embed_counter[NG_SOURCE_COUNTERS];
};
typedef struct privdata *sc_p;

/* Node flags */
#define NG_SOURCE_ACTIVE	(NGF_TYPE1)

/* Netgraph methods */
static ng_constructor_t	ng_source_constructor;
static ng_rcvmsg_t	ng_source_rcvmsg;
static ng_shutdown_t	ng_source_rmnode;
static ng_newhook_t	ng_source_newhook;
static ng_connect_t	ng_source_connect;
static ng_rcvdata_t	ng_source_rcvdata;
static ng_disconnect_t	ng_source_disconnect;

/* Other functions */
static void		ng_source_intr(node_p, hook_p, void *, int);
static void		ng_source_clr_data (sc_p);
static int		ng_source_start (sc_p, uint64_t);
static void		ng_source_stop (sc_p);
static int		ng_source_send (sc_p, int, int *);
static int		ng_source_store_output_ifp(sc_p, char *);
static void		ng_source_packet_mod(sc_p, struct mbuf *,
			    int, int, caddr_t, int);
static void		ng_source_mod_counter(sc_p sc,
			    struct ng_source_embed_cnt_info *cnt,
			    struct mbuf *m, int increment);
static int		ng_source_dup_mod(sc_p, struct mbuf *,
			    struct mbuf **);

/* Parse type for timeval */
static const struct ng_parse_struct_field ng_source_timeval_type_fields[] = {
	{ "tv_sec",		&ng_parse_int32_type	},
	{ "tv_usec",		&ng_parse_int32_type	},
	{ NULL }
};
const struct ng_parse_type ng_source_timeval_type = {
	&ng_parse_struct_type,
	&ng_source_timeval_type_fields
};

/* Parse type for struct ng_source_stats */
static const struct ng_parse_struct_field ng_source_stats_type_fields[]
	= NG_SOURCE_STATS_TYPE_INFO;
static const struct ng_parse_type ng_source_stats_type = {
	&ng_parse_struct_type,
	&ng_source_stats_type_fields
};

/* Parse type for struct ng_source_embed_info */
static const struct ng_parse_struct_field ng_source_embed_type_fields[] =
	NG_SOURCE_EMBED_TYPE_INFO;
static const struct ng_parse_type ng_source_embed_type = {
	&ng_parse_struct_type,
	&ng_source_embed_type_fields
};

/* Parse type for struct ng_source_embed_cnt_info */
static const struct ng_parse_struct_field ng_source_embed_cnt_type_fields[] =
	NG_SOURCE_EMBED_CNT_TYPE_INFO;
static const struct ng_parse_type ng_source_embed_cnt_type = {
	&ng_parse_struct_type,
	&ng_source_embed_cnt_type_fields
};

/* List of commands and how to convert arguments to/from ASCII */
static const struct ng_cmdlist ng_source_cmds[] = {
	{
	  NGM_SOURCE_COOKIE,
	  NGM_SOURCE_GET_STATS,
	  "getstats",
	  NULL,
	  &ng_source_stats_type
	},
	{
	  NGM_SOURCE_COOKIE,
	  NGM_SOURCE_CLR_STATS,
	  "clrstats",
	  NULL,
	  NULL
	},
	{
	  NGM_SOURCE_COOKIE,
	  NGM_SOURCE_GETCLR_STATS,
	  "getclrstats",
	  NULL,
	  &ng_source_stats_type
	},
	{
	  NGM_SOURCE_COOKIE,
	  NGM_SOURCE_START,
	  "start",
	  &ng_parse_uint64_type,
	  NULL
	},
	{
	  NGM_SOURCE_COOKIE,
	  NGM_SOURCE_STOP,
	  "stop",
	  NULL,
	  NULL
	},
	{
	  NGM_SOURCE_COOKIE,
	  NGM_SOURCE_CLR_DATA,
	  "clrdata",
	  NULL,
	  NULL
	},
	{
	  NGM_SOURCE_COOKIE,
	  NGM_SOURCE_SETIFACE,
	  "setiface",
	  &ng_parse_string_type,
	  NULL
	},
	{
	  NGM_SOURCE_COOKIE,
	  NGM_SOURCE_SETPPS,
	  "setpps",
	  &ng_parse_uint32_type,
	  NULL
	},
	{
	  NGM_SOURCE_COOKIE,
	  NGM_SOURCE_SET_TIMESTAMP,
	  "settimestamp",
	  &ng_source_embed_type,
	  NULL
	},
	{
	  NGM_SOURCE_COOKIE,
	  NGM_SOURCE_GET_TIMESTAMP,
	  "gettimestamp",
	  NULL,
	  &ng_source_embed_type
	},
	{
	  NGM_SOURCE_COOKIE,
	  NGM_SOURCE_SET_COUNTER,
	  "setcounter",
	  &ng_source_embed_cnt_type,
	  NULL
	},
	{
	  NGM_SOURCE_COOKIE,
	  NGM_SOURCE_GET_COUNTER,
	  "getcounter",
	  &ng_parse_uint8_type,
	  &ng_source_embed_cnt_type
	},
	{ 0 }
};

/* Netgraph type descriptor */
static struct ng_type ng_source_typestruct = {
	.version =	NG_ABI_VERSION,
	.name =		NG_SOURCE_NODE_TYPE,
	.constructor =	ng_source_constructor,
	.rcvmsg =	ng_source_rcvmsg,
	.shutdown =	ng_source_rmnode,
	.newhook =	ng_source_newhook,
	.connect =	ng_source_connect,
	.rcvdata =	ng_source_rcvdata,
	.disconnect =	ng_source_disconnect,
	.cmdlist =	ng_source_cmds,
};
NETGRAPH_INIT(source, &ng_source_typestruct);

static int ng_source_set_autosrc(sc_p, uint32_t);

/*
 * Node constructor
 */
static int
ng_source_constructor(node_p node)
{
	sc_p sc;

	sc = malloc(sizeof(*sc), M_NETGRAPH, M_NOWAIT | M_ZERO);
	if (sc == NULL)
		return (ENOMEM);

	NG_NODE_SET_PRIVATE(node, sc);
	sc->node = node;
	sc->snd_queue.ifq_maxlen = 2048;	/* XXX not checked */
	ng_callout_init(&sc->intr_ch);

	return (0);
}

/*
 * Add a hook
 */
static int
ng_source_newhook(node_p node, hook_p hook, const char *name)
{
	sc_p sc = NG_NODE_PRIVATE(node);

	if (strcmp(name, NG_SOURCE_HOOK_INPUT) == 0) {
		sc->input = hook;
	} else if (strcmp(name, NG_SOURCE_HOOK_OUTPUT) == 0) {
		sc->output = hook;
		sc->output_ifp = 0;
		bzero(&sc->stats, sizeof(sc->stats));
	} else
		return (EINVAL);

	return (0);
}

/*
 * Hook has been added
 */
static int
ng_source_connect(hook_p hook)
{
	sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
	struct ng_mesg *msg;
	int dummy_error = 0;

	/*
	 * If this is "output" hook, then request information
	 * from our downstream.
	 */
	if (hook == sc->output) {
		NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_GET_IFNAME,
		    0, M_NOWAIT);
		if (msg == NULL)
			return (ENOBUFS);

		/*
		 * Our hook and peer hook have HK_INVALID flag set,
		 * so we can't use NG_SEND_MSG_HOOK() macro here.
		 */
		NG_SEND_MSG_ID(dummy_error, sc->node, msg,
		    NG_NODE_ID(NG_PEER_NODE(sc->output)), NG_NODE_ID(sc->node));
	}

	return (0);
}

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

	NGI_GET_MSG(item, msg);

	switch (msg->header.typecookie) {
	case NGM_SOURCE_COOKIE:
		if (msg->header.flags & NGF_RESP) {
			error = EINVAL;
			break;
		}
		switch (msg->header.cmd) {
		case NGM_SOURCE_GET_STATS:
		case NGM_SOURCE_CLR_STATS:
		case NGM_SOURCE_GETCLR_STATS:
                    {
			struct ng_source_stats *stats;

                        if (msg->header.cmd != NGM_SOURCE_CLR_STATS) {
                                NG_MKRESPONSE(resp, msg,
                                    sizeof(*stats), M_NOWAIT);
				if (resp == NULL) {
					error = ENOMEM;
					goto done;
				}
				sc->stats.queueOctets = sc->queueOctets;
				sc->stats.queueFrames = sc->snd_queue.ifq_len;
				if ((sc->node->nd_flags & NG_SOURCE_ACTIVE)
				    && !timevalisset(&sc->stats.endTime)) {
					getmicrotime(&sc->stats.elapsedTime);
					timevalsub(&sc->stats.elapsedTime,
					    &sc->stats.startTime);
				}
				stats = (struct ng_source_stats *)resp->data;
				bcopy(&sc->stats, stats, sizeof(* stats));
                        }
                        if (msg->header.cmd != NGM_SOURCE_GET_STATS)
				bzero(&sc->stats, sizeof(sc->stats));
		    }
		    break;
		case NGM_SOURCE_START:
		    {
			uint64_t packets;

			if (msg->header.arglen != sizeof(uint64_t)) {
				error = EINVAL;
				break;
			}

			packets = *(uint64_t *)msg->data;

			error = ng_source_start(sc, packets);

		    	break;
		    }
		case NGM_SOURCE_STOP:
			ng_source_stop(sc);
			break;
		case NGM_SOURCE_CLR_DATA:
			ng_source_clr_data(sc);
			break;
		case NGM_SOURCE_SETIFACE:
		    {
			char *ifname = (char *)msg->data;

			if (msg->header.arglen < 2) {
				error = EINVAL;
				break;
			}

			ng_source_store_output_ifp(sc, ifname);
			break;
		    }
		case NGM_SOURCE_SETPPS:
		    {
			uint32_t pps;

			if (msg->header.arglen != sizeof(uint32_t)) {
				error = EINVAL;
				break;
			}

			pps = *(uint32_t *)msg->data;

			sc->stats.maxPps = pps;

			break;
		    }
		case NGM_SOURCE_SET_TIMESTAMP:
		    {
			struct ng_source_embed_info *embed;

			if (msg->header.arglen != sizeof(*embed)) {
				error = EINVAL;
				goto done;
			}
			embed = (struct ng_source_embed_info *)msg->data;
			bcopy(embed, &sc->embed_timestamp, sizeof(*embed));

			break;
		    }
		case NGM_SOURCE_GET_TIMESTAMP:
		    {
			struct ng_source_embed_info *embed;

			NG_MKRESPONSE(resp, msg, sizeof(*embed), M_DONTWAIT);
			if (resp == NULL) {
				error = ENOMEM;
				goto done;
			}
			embed = (struct ng_source_embed_info *)resp->data;
			bcopy(&sc->embed_timestamp, embed, sizeof(*embed));

			break;
		    }
		case NGM_SOURCE_SET_COUNTER:
		    {
			struct ng_source_embed_cnt_info *embed;

			if (msg->header.arglen != sizeof(*embed)) {
				error = EINVAL;
				goto done;
			}
			embed = (struct ng_source_embed_cnt_info *)msg->data;
			if (embed->index >= NG_SOURCE_COUNTERS ||
			    !(embed->width == 1 || embed->width == 2 ||
			    embed->width == 4)) {
				error = EINVAL;
				goto done;
			}
			bcopy(embed, &sc->embed_counter[embed->index],
			    sizeof(*embed));

			break;
		    }
		case NGM_SOURCE_GET_COUNTER:
		    {
			uint8_t index = *(uint8_t *)msg->data;
			struct ng_source_embed_cnt_info *embed;

			if (index >= NG_SOURCE_COUNTERS) {
				error = EINVAL;
				goto done;
			}
			NG_MKRESPONSE(resp, msg, sizeof(*embed), M_DONTWAIT);
			if (resp == NULL) {
				error = ENOMEM;
				goto done;
			}
			embed = (struct ng_source_embed_cnt_info *)resp->data;
			bcopy(&sc->embed_counter[index], embed, sizeof(*embed));

			break;
		    }
		default:
			error = EINVAL;
			break;
		}
		break;
	case NGM_ETHER_COOKIE:
		if (!(msg->header.flags & NGF_RESP)) {
			error = EINVAL;
			break;
		}
		switch (msg->header.cmd) {
		case NGM_ETHER_GET_IFNAME:
		    {
			char *ifname = (char *)msg->data;

			if (msg->header.arglen < 2) {
				error = EINVAL;
				break;
			}

			if (ng_source_store_output_ifp(sc, ifname) == 0)
				ng_source_set_autosrc(sc, 0);
			break;
		    }
		default:
			error = EINVAL;
		}
		break;
	default:
		error = EINVAL;
		break;
	}

done:
	/* Take care of synchronous response, if any. */
	NG_RESPOND_MSG(error, node, item, resp);
	/* Free the message and return. */
	NG_FREE_MSG(msg);
	return (error);
}

/*
 * Receive data on a hook
 *
 * If data comes in the input hook, enqueue it on the send queue.
 * If data comes in the output hook, discard it.
 */
static int
ng_source_rcvdata(hook_p hook, item_p item)
{
	sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
	struct mbuf *m;
	int error = 0;

	NGI_GET_M(item, m);
	NG_FREE_ITEM(item);

	/* Which hook? */
	if (hook == sc->output) {
		/* discard */
		NG_FREE_M(m);
		return (error);
	}
	KASSERT(hook == sc->input, ("%s: no hook!", __func__));

	/* Enqueue packet. */
	/* XXX should we check IF_QFULL() ? */
	_IF_ENQUEUE(&sc->snd_queue, m);
	sc->queueOctets += m->m_pkthdr.len;
	sc->last_packet = m;

	return (0);
}

/*
 * Shutdown processing
 */
static int
ng_source_rmnode(node_p node)
{
	sc_p sc = NG_NODE_PRIVATE(node);

	ng_source_stop(sc);
	ng_source_clr_data(sc);
	NG_NODE_SET_PRIVATE(node, NULL);
	NG_NODE_UNREF(node);
	free(sc, M_NETGRAPH);

	return (0);
}

/*
 * Hook disconnection
 */
static int
ng_source_disconnect(hook_p hook)
{
	sc_p sc;

	sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
	KASSERT(sc != NULL, ("%s: null node private", __func__));
	if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 || hook == sc->output)
		ng_rmnode_self(NG_HOOK_NODE(hook));
	return (0);
}

/*
 * Set sc->output_ifp to point to the the struct ifnet of the interface
 * reached via our output hook.
 */
static int
ng_source_store_output_ifp(sc_p sc, char *ifname)
{
	struct ifnet *ifp;
	int s;

	ifp = ifunit(ifname);

	if (ifp == NULL) {
		printf("%s: can't find interface %d\n", __func__, if_index);
		return (EINVAL);
	}
	sc->output_ifp = ifp;

#if 1
	/* XXX mucking with a drivers ifqueue size is ugly but we need it
	 * to queue a lot of packets to get close to line rate on a gigabit
	 * interface with small packets.
	 * XXX we should restore the original value at stop or disconnect
	 */
	s = splimp();		/* XXX is this required? */
	if (ifp->if_snd.ifq_maxlen < NG_SOURCE_DRIVER_IFQ_MAXLEN) {
		printf("ng_source: changing ifq_maxlen from %d to %d\n",
		    ifp->if_snd.ifq_maxlen, NG_SOURCE_DRIVER_IFQ_MAXLEN);
		ifp->if_snd.ifq_maxlen = NG_SOURCE_DRIVER_IFQ_MAXLEN;
	}
	splx(s);
#endif
	return (0);
}

/*
 * Set the attached ethernet node's ethernet source address override flag.
 */
static int
ng_source_set_autosrc(sc_p sc, uint32_t flag)
{
	struct ng_mesg *msg;
	int error = 0;

	NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_SET_AUTOSRC,
	    sizeof (uint32_t), M_NOWAIT);
	if (msg == NULL)
		return(ENOBUFS);

	*(uint32_t *)msg->data = flag;
	NG_SEND_MSG_HOOK(error, sc->node, msg, sc->output, 0);
	return (error);
}

/*
 * Clear out the data we've queued
 */
static void
ng_source_clr_data (sc_p sc)
{
	struct mbuf *m;

	for (;;) {
		_IF_DEQUEUE(&sc->snd_queue, m);
		if (m == NULL)
			break;
		NG_FREE_M(m);
	}
	sc->queueOctets = 0;
	sc->last_packet = NULL;
}

/*
 * Start sending queued data out the output hook
 */
static int
ng_source_start(sc_p sc, uint64_t packets)
{
	if (sc->output_ifp == NULL) {
		printf("ng_source: start without iface configured\n");
		return (ENXIO);
	}

	if (sc->node->nd_flags & NG_SOURCE_ACTIVE)
		return (EBUSY);

	sc->node->nd_flags |= NG_SOURCE_ACTIVE;

	sc->packets = packets;
	timevalclear(&sc->stats.elapsedTime);
	timevalclear(&sc->stats.endTime);
	getmicrotime(&sc->stats.startTime);
	getmicrotime(&sc->stats.lastTime);
	ng_callout(&sc->intr_ch, sc->node, NULL, 0,
	    ng_source_intr, sc, 0);

	return (0);
}

/*
 * Stop sending queued data out the output hook
 */
static void
ng_source_stop(sc_p sc)
{
	ng_uncallout(&sc->intr_ch, sc->node);
	sc->node->nd_flags &= ~NG_SOURCE_ACTIVE;
	getmicrotime(&sc->stats.endTime);
	sc->stats.elapsedTime = sc->stats.endTime;
	timevalsub(&sc->stats.elapsedTime, &sc->stats.startTime);
}

/*
 * While active called every NG_SOURCE_INTR_TICKS ticks.
 * Sends as many packets as the interface connected to our
 * output hook is able to enqueue.
 */
static void
ng_source_intr(node_p node, hook_p hook, void *arg1, int arg2)
{
	sc_p sc = (sc_p)arg1;
	struct ifqueue *ifq;
	int packets;

	KASSERT(sc != NULL, ("%s: null node private", __func__));

	if (sc->packets == 0 || sc->output == NULL
	    || (sc->node->nd_flags & NG_SOURCE_ACTIVE) == 0) {
		ng_source_stop(sc);
		return;
	}

	if (sc->output_ifp != NULL) {
		ifq = (struct ifqueue *)&sc->output_ifp->if_snd;
		packets = ifq->ifq_maxlen - ifq->ifq_len;
	} else
		packets = sc->snd_queue.ifq_len;

	if (sc->stats.maxPps != 0) {
		struct timeval	now, elapsed;
		uint64_t	usec;
		int		maxpkt;

		getmicrotime(&now);
		elapsed = now;
		timevalsub(&elapsed, &sc->stats.lastTime);
		usec = elapsed.tv_sec * 1000000 + elapsed.tv_usec;
		maxpkt = (uint64_t)sc->stats.maxPps * usec / 1000000;
		sc->stats.lastTime = now;
		if (packets > maxpkt)
			packets = maxpkt;
	}

	ng_source_send(sc, packets, NULL);
	if (sc->packets == 0)
		ng_source_stop(sc);
	else
		ng_callout(&sc->intr_ch, node, NULL, NG_SOURCE_INTR_TICKS,
		    ng_source_intr, sc, 0);
}

/*
 * Send packets out our output hook.
 */
static int
ng_source_send(sc_p sc, int tosend, int *sent_p)
{
	struct mbuf *m, *m2;
	int sent;
	int error = 0;

	KASSERT(tosend >= 0, ("%s: negative tosend param", __func__));
	KASSERT(sc->node->nd_flags & NG_SOURCE_ACTIVE,
	    ("%s: inactive node", __func__));

	if ((uint64_t)tosend > sc->packets)
		tosend = sc->packets;

	/* Go through the queue sending packets one by one. */
	for (sent = 0; error == 0 && sent < tosend; ++sent) {
		_IF_DEQUEUE(&sc->snd_queue, m);
		if (m == NULL)
			break;

		/* Duplicate and modify the packet. */
		error = ng_source_dup_mod(sc, m, &m2);
		if (error) {
			if (error == ENOBUFS)
				_IF_PREPEND(&sc->snd_queue, m);
			else
				_IF_ENQUEUE(&sc->snd_queue, m);
			break;
		}

		/* Re-enqueue the original packet for us. */
		_IF_ENQUEUE(&sc->snd_queue, m);

		sc->stats.outFrames++;
		sc->stats.outOctets += m2->m_pkthdr.len;
		NG_SEND_DATA_ONLY(error, sc->output, m2);
		if (error)
			break;
	}

	sc->packets -= sent;
	if (sent_p != NULL)
		*sent_p = sent;
	return (error);
}

/*
 * Modify packet in 'm' by changing 'len' bytes starting at 'offset'
 * to data in 'cp'.
 *
 * The packet data in 'm' must be in a contiguous buffer in a single mbuf.
 */
static void
ng_source_packet_mod(sc_p sc, struct mbuf *m, int offset, int len, caddr_t cp,
    int flags)
{
	if (len == 0)
		return;

	/* Can't modify beyond end of packet. */
	/* TODO: Pad packet for this case. */
	if (offset + len > m->m_len)
		return;

	bcopy(cp, mtod_off(m, offset, caddr_t), len);
}

static void
ng_source_mod_counter(sc_p sc, struct ng_source_embed_cnt_info *cnt,
    struct mbuf *m, int increment)
{
	caddr_t cp;
	uint32_t val;

	val = htonl(cnt->next_val);
	cp = (caddr_t)&val + sizeof(val) - cnt->width;
	ng_source_packet_mod(sc, m, cnt->offset, cnt->width, cp, cnt->flags);

	if (increment) {
		cnt->next_val += increment;

		if (increment > 0 && cnt->next_val > cnt->max_val) {
			cnt->next_val = cnt->min_val - 1 +
			    (cnt->next_val - cnt->max_val);
			if (cnt->next_val > cnt->max_val)
				cnt->next_val = cnt->max_val;
		} else if (increment < 0 && cnt->next_val < cnt->min_val) {
			cnt->next_val = cnt->max_val + 1 +
			    (cnt->next_val - cnt->min_val);
			if (cnt->next_val < cnt->min_val)
				cnt->next_val = cnt->max_val;
		}
	}
}

static int
ng_source_dup_mod(sc_p sc, struct mbuf *m0, struct mbuf **m_ptr)
{
	struct mbuf *m;
	struct ng_source_embed_cnt_info *cnt;
	struct ng_source_embed_info *ts;
	int modify;
	int error = 0;
	int i, increment;

	/* Are we going to modify packets? */
	modify = sc->embed_timestamp.flags & NGM_SOURCE_EMBED_ENABLE;
	for (i = 0; !modify && i < NG_SOURCE_COUNTERS; ++i)
		modify = sc->embed_counter[i].flags & NGM_SOURCE_EMBED_ENABLE;

	/* Duplicate the packet. */
	if (modify)
		m = m_dup(m0, M_DONTWAIT);
	else
		m = m_copypacket(m0, M_DONTWAIT);
	if (m == NULL) {
		error = ENOBUFS;
		goto done;
	}
	*m_ptr = m;

	if (!modify)
		goto done;

	/* Modify the copied packet for sending. */
	KASSERT(M_WRITABLE(m), ("%s: packet not writable", __func__));

	for (i = 0; i < NG_SOURCE_COUNTERS; ++i) {
		cnt = &sc->embed_counter[i];
		if (cnt->flags & NGM_SOURCE_EMBED_ENABLE) {
			if ((cnt->flags & NGM_SOURCE_INC_CNT_PER_LIST) == 0 ||
			    sc->last_packet == m0)
				increment = cnt->increment;
			else
				increment = 0;
			ng_source_mod_counter(sc, cnt, m, increment);
		}
	}

	ts = &sc->embed_timestamp;
	if (ts->flags & NGM_SOURCE_EMBED_ENABLE) {
		struct timeval now;
		getmicrotime(&now);
		now.tv_sec = htonl(now.tv_sec);
		now.tv_usec = htonl(now.tv_usec);
		ng_source_packet_mod(sc, m, ts->offset, sizeof (now),
		    (caddr_t)&now, ts->flags);
	}

done:
	return(error);
}
OpenPOWER on IntegriCloud