summaryrefslogtreecommitdiff
path: root/package/broadcom-wl/src/kmod/bcmutils.c
blob: c264ea500b77f2ee58d308291b8920b6a2a74afc (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
/*
 * Misc useful OS-independent routines.
 *
 * Copyright 2006, Broadcom Corporation
 * All Rights Reserved.
 * 
 * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
 * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
 * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
 * $Id: bcmutils.c,v 1.1.1.12 2006/02/27 03:43:16 honor Exp $
 */

#include <typedefs.h>
#include <bcmdefs.h>
#include <stdarg.h>
#include <osl.h>
#include "linux_osl.h"
#include "pktq.h"
#include <bcmutils.h>
#include <sbutils.h>
#include <bcmnvram.h>
#include <bcmendian.h>
#include <bcmdevs.h>
#include "bcmip.h"

#define ETHER_TYPE_8021Q       0x8100
#define ETHER_TYPE_IP          0x0800
#define VLAN_PRI_SHIFT             13
#define VLAN_PRI_MASK               7


struct  ether_header {
	uint8   ether_dhost[6];
	uint8   ether_shost[6];
	uint16  ether_type;
} __attribute__((packed));


struct ethervlan_header {
	uint8   ether_dhost[6];
	uint8   ether_shost[6];
	uint16  vlan_type;		/* 0x8100 */
	uint16  vlan_tag;		/* priority, cfi and vid */
	uint16  ether_type;
};

/* copy a pkt buffer chain into a buffer */
uint
pktcopy(osl_t *osh, void *p, uint offset, int len, uchar *buf)
{
	uint n, ret = 0;

	if (len < 0)
		len = 4096;	/* "infinite" */

	/* skip 'offset' bytes */
	for (; p && offset; p = PKTNEXT(osh, p)) {
		if (offset < (uint)PKTLEN(osh, p))
			break;
		offset -= PKTLEN(osh, p);
	}

	if (!p)
		return 0;

	/* copy the data */
	for (; p && len; p = PKTNEXT(osh, p)) {
		n = MIN((uint)PKTLEN(osh, p) - offset, (uint)len);
		bcopy(PKTDATA(osh, p) + offset, buf, n);
		buf += n;
		len -= n;
		ret += n;
		offset = 0;
	}

	return ret;
}

/* return total length of buffer chain */
uint
pkttotlen(osl_t *osh, void *p)
{
	uint total;

	total = 0;
	for (; p; p = PKTNEXT(osh, p))
		total += PKTLEN(osh, p);
	return (total);
}

/* return the last buffer of chained pkt */
void *
pktlast(osl_t *osh, void *p)
{
	for (; PKTNEXT(osh, p); p = PKTNEXT(osh, p))
		;

	return (p);
}


/*
 * osl multiple-precedence packet queue
 * hi_prec is always >= the number of the highest non-empty queue
 */
void *
pktq_penq(struct pktq *pq, int prec, void *p)
{
	struct pktq_prec *q;

	ASSERT(prec >= 0 && prec < pq->num_prec);
	ASSERT(PKTLINK(p) == NULL);         /* queueing chains not allowed */

	ASSERT(!pktq_full(pq));
	ASSERT(!pktq_pfull(pq, prec));

	q = &pq->q[prec];

	if (q->head)
		PKTSETLINK(q->tail, p);
	else
		q->head = p;

	q->tail = p;
	q->len++;

	pq->len++;

	if (pq->hi_prec < prec)
		pq->hi_prec = (uint8)prec;

	return p;
}

void *
pktq_penq_head(struct pktq *pq, int prec, void *p)
{
	struct pktq_prec *q;

	ASSERT(prec >= 0 && prec < pq->num_prec);
	ASSERT(PKTLINK(p) == NULL);         /* queueing chains not allowed */

	ASSERT(!pktq_full(pq));
	ASSERT(!pktq_pfull(pq, prec));

	q = &pq->q[prec];

	if (q->head == NULL)
		q->tail = p;

	PKTSETLINK(p, q->head);
	q->head = p;
	q->len++;

	pq->len++;

	if (pq->hi_prec < prec)
		pq->hi_prec = (uint8)prec;

	return p;
}

void *
pktq_pdeq(struct pktq *pq, int prec)
{
	struct pktq_prec *q;
	void *p;

	ASSERT(prec >= 0 && prec < pq->num_prec);

	q = &pq->q[prec];

	if ((p = q->head) == NULL)
		return NULL;

	if ((q->head = PKTLINK(p)) == NULL)
		q->tail = NULL;

	q->len--;

	pq->len--;

	PKTSETLINK(p, NULL);

	return p;
}

void *
pktq_pdeq_tail(struct pktq *pq, int prec)
{
	struct pktq_prec *q;
	void *p, *prev;

	ASSERT(prec >= 0 && prec < pq->num_prec);

	q = &pq->q[prec];

	if ((p = q->head) == NULL)
		return NULL;

	for (prev = NULL; p != q->tail; p = PKTLINK(p))
		prev = p;

	if (prev)
		PKTSETLINK(prev, NULL);
	else
		q->head = NULL;

	q->tail = prev;
	q->len--;

	pq->len--;

	return p;
}

void
pktq_pflush(osl_t *osh, struct pktq *pq, int prec, bool dir)
{
	struct pktq_prec *q;
	void *p;

	q = &pq->q[prec];
	p = q->head;
	while (p) {
		q->head = PKTLINK(p);
		PKTSETLINK(p, NULL);
		PKTFREE(osh, p, dir);
		q->len--;
		pq->len--;
		p = q->head;
	}
	ASSERT(q->len == 0);
	q->tail = NULL;
}

bool
pktq_pdel(struct pktq *pq, void *pktbuf, int prec)
{
	struct pktq_prec *q;
	void *p;

	ASSERT(prec >= 0 && prec < pq->num_prec);

	if (!pktbuf)
		return FALSE;

	q = &pq->q[prec];

	if (q->head == pktbuf) {
		if ((q->head = PKTLINK(pktbuf)) == NULL)
			q->tail = NULL;
	} else {
		for (p = q->head; p && PKTLINK(p) != pktbuf; p = PKTLINK(p))
			;
		if (p == NULL)
			return FALSE;

		PKTSETLINK(p, PKTLINK(pktbuf));
		if (q->tail == pktbuf)
			q->tail = p;
	}

	q->len--;
	pq->len--;
	PKTSETLINK(pktbuf, NULL);
	return TRUE;
}

void
pktq_init(struct pktq *pq, int num_prec, int max_len)
{
	int prec;

	ASSERT(num_prec > 0 && num_prec <= PKTQ_MAX_PREC);

	bzero(pq, sizeof(*pq));

	pq->num_prec = (uint16)num_prec;

	pq->max = (uint16)max_len;

	for (prec = 0; prec < num_prec; prec++)
		pq->q[prec].max = pq->max;
}

void *
pktq_deq(struct pktq *pq, int *prec_out)
{
	struct pktq_prec *q;
	void *p;
	int prec;

	if (pq->len == 0)
		return NULL;

	while ((prec = pq->hi_prec) > 0 && pq->q[prec].head == NULL)
		pq->hi_prec--;

	q = &pq->q[prec];

	if ((p = q->head) == NULL)
		return NULL;

	if ((q->head = PKTLINK(p)) == NULL)
		q->tail = NULL;

	q->len--;

	pq->len--;

	if (prec_out)
		*prec_out = prec;

	PKTSETLINK(p, NULL);

	return p;
}

void *
pktq_deq_tail(struct pktq *pq, int *prec_out)
{
	struct pktq_prec *q;
	void *p, *prev;
	int prec;

	if (pq->len == 0)
		return NULL;

	for (prec = 0; prec < pq->hi_prec; prec++)
		if (pq->q[prec].head)
			break;

	q = &pq->q[prec];

	if ((p = q->head) == NULL)
		return NULL;

	for (prev = NULL; p != q->tail; p = PKTLINK(p))
		prev = p;

	if (prev)
		PKTSETLINK(prev, NULL);
	else
		q->head = NULL;

	q->tail = prev;
	q->len--;

	pq->len--;

	if (prec_out)
		*prec_out = prec;

	PKTSETLINK(p, NULL);

	return p;
}

void *
pktq_peek(struct pktq *pq, int *prec_out)
{
	int prec;

	if (pq->len == 0)
		return NULL;

	while ((prec = pq->hi_prec) > 0 && pq->q[prec].head == NULL)
		pq->hi_prec--;

	if (prec_out)
		*prec_out = prec;

	return (pq->q[prec].head);
}

void *
pktq_peek_tail(struct pktq *pq, int *prec_out)
{
	int prec;

	if (pq->len == 0)
		return NULL;

	for (prec = 0; prec < pq->hi_prec; prec++)
		if (pq->q[prec].head)
			break;

	if (prec_out)
		*prec_out = prec;

	return (pq->q[prec].tail);
}

void
pktq_flush(osl_t *osh, struct pktq *pq, bool dir)
{
	int prec;
	for (prec = 0; prec < pq->num_prec; prec++)
		pktq_pflush(osh, pq, prec, dir);
	ASSERT(pq->len == 0);
}

/* Return sum of lengths of a specific set of precedences */
int
pktq_mlen(struct pktq *pq, uint prec_bmp)
{
	int prec, len;

	len = 0;

	for (prec = 0; prec <= pq->hi_prec; prec++)
		if (prec_bmp & (1 << prec))
			len += pq->q[prec].len;

	return len;
}

/* Priority dequeue from a specific set of precedences */
void *
pktq_mdeq(struct pktq *pq, uint prec_bmp, int *prec_out)
{
	struct pktq_prec *q;
	void *p;
	int prec;

	if (pq->len == 0)
		return NULL;

	while ((prec = pq->hi_prec) > 0 && pq->q[prec].head == NULL)
		pq->hi_prec--;

	while ((prec_bmp & (1 << prec)) == 0 || pq->q[prec].head == NULL)
		if (prec-- == 0)
			return NULL;

	q = &pq->q[prec];

	if ((p = q->head) == NULL)
		return NULL;

	if ((q->head = PKTLINK(p)) == NULL)
		q->tail = NULL;

	q->len--;

	if (prec_out)
		*prec_out = prec;

	pq->len--;

	PKTSETLINK(p, NULL);

	return p;
}

char*
bcmstrcat(char *dest, const char *src)
{
	strcpy(&dest[strlen(dest)], src);
	return (dest);
}

char*
bcm_ether_ntoa(struct ether_addr *ea, char *buf)
{
	sprintf(buf, "%02x:%02x:%02x:%02x:%02x:%02x",
		ea->octet[0]&0xff, ea->octet[1]&0xff, ea->octet[2]&0xff,
		ea->octet[3]&0xff, ea->octet[4]&0xff, ea->octet[5]&0xff);
	return (buf);
}

/* parse a xx:xx:xx:xx:xx:xx format ethernet address */
int
bcm_ether_atoe(char *p, struct ether_addr *ea)
{
	int i = 0;

	for (;;) {
		ea->octet[i++] = (char) bcm_strtoul(p, &p, 16);
		if (!*p++ || i == 6)
			break;
	}

	return (i == 6);
}

/* Takes an Ethernet frame and sets out-of-bound PKTPRIO
 * Also updates the inplace vlan tag if requested
 */
void
pktsetprio(void *pkt, bool update_vtag)
{
	struct ether_header *eh;
	struct ethervlan_header *evh;
	uint8 *pktdata;
	int priority = 0;

	pktdata = (uint8 *) PKTDATA(NULL, pkt);
	ASSERT(ISALIGNED((uintptr)pktdata, sizeof(uint16)));

	eh = (struct ether_header *) pktdata;

	if (ntoh16(eh->ether_type) == ETHER_TYPE_8021Q) {
		uint16 vlan_tag;
		int vlan_prio, dscp_prio = 0;

		evh = (struct ethervlan_header *)eh;

		vlan_tag = ntoh16(evh->vlan_tag);
		vlan_prio = (int) (vlan_tag >> VLAN_PRI_SHIFT) & VLAN_PRI_MASK;

		if (ntoh16(evh->ether_type) == ETHER_TYPE_IP) {
			uint8 *ip_body = pktdata + sizeof(struct ethervlan_header);
			uint8 tos_tc = IP_TOS(ip_body);
			dscp_prio = (int)(tos_tc >> IPV4_TOS_PREC_SHIFT);
		}

		/* DSCP priority gets precedence over 802.1P (vlan tag) */
		priority = (dscp_prio != 0) ? dscp_prio : vlan_prio;

		/* 
		 * If the DSCP priority is not the same as the VLAN priority,
		 * then overwrite the priority field in the vlan tag, with the
		 * DSCP priority value. This is required for Linux APs because
		 * the VLAN driver on Linux, overwrites the skb->priority field
		 * with the priority value in the vlan tag
		 */
		if (update_vtag && (priority != vlan_prio)) {
			vlan_tag &= ~(VLAN_PRI_MASK << VLAN_PRI_SHIFT);
			vlan_tag |= (uint16)priority << VLAN_PRI_SHIFT;
			evh->vlan_tag = hton16(vlan_tag);
		}
	} else if (ntoh16(eh->ether_type) == ETHER_TYPE_IP) {
		uint8 *ip_body = pktdata + sizeof(struct ether_header);
		uint8 tos_tc = IP_TOS(ip_body);
		priority = (int)(tos_tc >> IPV4_TOS_PREC_SHIFT);
	}

	ASSERT(priority >= 0 && priority <= MAXPRIO);
	PKTSETPRIO(pkt, priority);
}

static char bcm_undeferrstr[BCME_STRLEN];

static const char *bcmerrorstrtable[] = BCMERRSTRINGTABLE;

/* Convert the Error codes into related Error strings  */
const char *
bcmerrorstr(int bcmerror)
{
	int abs_bcmerror;

	abs_bcmerror = ABS(bcmerror);

	/* check if someone added a bcmerror code but forgot to add errorstring */
	ASSERT(ABS(BCME_LAST) == (ARRAYSIZE(bcmerrorstrtable) - 1));
	if ((bcmerror > 0) || (abs_bcmerror > ABS(BCME_LAST))) {
		sprintf(bcm_undeferrstr, "undefined Error %d", bcmerror);
		return bcm_undeferrstr;
	}

	ASSERT((strlen((char*)bcmerrorstrtable[abs_bcmerror])) < BCME_STRLEN);

	return bcmerrorstrtable[abs_bcmerror];
}


int
bcm_iovar_lencheck(const bcm_iovar_t *vi, void *arg, int len, bool set)
{
	int bcmerror = 0;

	/* length check on io buf */
	switch (vi->type) {
	case IOVT_BOOL:
	case IOVT_INT8:
	case IOVT_INT16:
	case IOVT_INT32:
	case IOVT_UINT8:
	case IOVT_UINT16:
	case IOVT_UINT32:
		/* all integers are int32 sized args at the ioctl interface */
		if (len < (int)sizeof(int)) {
			bcmerror = BCME_BUFTOOSHORT;
		}
		break;

	case IOVT_BUFFER:
		/* buffer must meet minimum length requirement */
		if (len < vi->minlen) {
			bcmerror = BCME_BUFTOOSHORT;
		}
		break;

	case IOVT_VOID:
		if (!set) {
			/* Cannot return nil... */
			bcmerror = BCME_UNSUPPORTED;
		} else if (len) {
			/* Set is an action w/o parameters */
			bcmerror = BCME_BUFTOOLONG;
		}
		break;

	default:
		/* unknown type for length check in iovar info */
		ASSERT(0);
		bcmerror = BCME_UNSUPPORTED;
	}

	return bcmerror;
}

#define CRC_INNER_LOOP(n, c, x) \
		    (c) = ((c) >> 8) ^ crc##n##_table[((c) ^ (x)) & 0xff]

static uint32 crc32_table[256] = {
    0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA,
    0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
    0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
    0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
    0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE,
    0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
    0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC,
    0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
    0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
    0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
    0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940,
    0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
    0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116,
    0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
    0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
    0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
    0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A,
    0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
    0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818,
    0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
    0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
    0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
    0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C,
    0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
    0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2,
    0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
    0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
    0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
    0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086,
    0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
    0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4,
    0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
    0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
    0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
    0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
    0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
    0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE,
    0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
    0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
    0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
    0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252,
    0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
    0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60,
    0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
    0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
    0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
    0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04,
    0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
    0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A,
    0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
    0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
    0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
    0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E,
    0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
    0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C,
    0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
    0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
    0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
    0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0,
    0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
    0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6,
    0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
    0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
    0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
};

uint32
hndcrc32(
    uint8 *pdata,  /* pointer to array of data to process */
    uint   nbytes, /* number of input data bytes to process */
    uint32 crc     /* either CRC32_INIT_VALUE or previous return value */
)
{
	uint8 *pend;
#ifdef __mips__
	uint8 tmp[4];
	ulong *tptr = (ulong *)tmp;

	/* in case the beginning of the buffer isn't aligned */
	pend = (uint8 *)((uint)(pdata + 3) & 0xfffffffc);
	nbytes -= (pend - pdata);
	while (pdata < pend)
		CRC_INNER_LOOP(32, crc, *pdata++);

	/* handle bulk of data as 32-bit words */
	pend = pdata + (nbytes & 0xfffffffc);
	while (pdata < pend) {
		*tptr = *(ulong *)pdata;
		pdata += sizeof(ulong *);
		CRC_INNER_LOOP(32, crc, tmp[0]);
		CRC_INNER_LOOP(32, crc, tmp[1]);
		CRC_INNER_LOOP(32, crc, tmp[2]);
		CRC_INNER_LOOP(32, crc, tmp[3]);
	}

	/* 1-3 bytes at end of buffer */
	pend = pdata + (nbytes & 0x03);
	while (pdata < pend)
		CRC_INNER_LOOP(32, crc, *pdata++);
#else
	pend = pdata + nbytes;
	while (pdata < pend)
		CRC_INNER_LOOP(32, crc, *pdata++);
#endif /* __mips__ */

	return crc;
}


/*
 * Advance from the current 1-byte tag/1-byte length/variable-length value
 * triple, to the next, returning a pointer to the next.
 * If the current or next TLV is invalid (does not fit in given buffer length),
 * NULL is returned.
 * *buflen is not modified if the TLV elt parameter is invalid, or is decremented
 * by the TLV paramter's length if it is valid.
 */
bcm_tlv_t *
bcm_next_tlv(bcm_tlv_t *elt, int *buflen)
{
	int len;

	/* validate current elt */
	if (!bcm_valid_tlv(elt, *buflen))
		return NULL;

	/* advance to next elt */
	len = elt->len;
	elt = (bcm_tlv_t*)(elt->data + len);
	*buflen -= (2 + len);

	/* validate next elt */
	if (!bcm_valid_tlv(elt, *buflen))
		return NULL;

	return elt;
}

/*
 * Traverse a string of 1-byte tag/1-byte length/variable-length value
 * triples, returning a pointer to the substring whose first element
 * matches tag
 */
bcm_tlv_t *
bcm_parse_tlvs(void *buf, int buflen, uint key)
{
	bcm_tlv_t *elt;
	int totlen;

	elt = (bcm_tlv_t*)buf;
	totlen = buflen;

	/* find tagged parameter */
	while (totlen >= 2) {
		int len = elt->len;

		/* validate remaining totlen */
		if ((elt->id == key) && (totlen >= (len + 2)))
			return (elt);

		elt = (bcm_tlv_t*)((uint8*)elt + (len + 2));
		totlen -= (len + 2);
	}

	return NULL;
}

/*
 * Traverse a string of 1-byte tag/1-byte length/variable-length value
 * triples, returning a pointer to the substring whose first element
 * matches tag.  Stop parsing when we see an element whose ID is greater
 * than the target key.
 */
bcm_tlv_t *
bcm_parse_ordered_tlvs(void *buf, int buflen, uint key)
{
	bcm_tlv_t *elt;
	int totlen;

	elt = (bcm_tlv_t*)buf;
	totlen = buflen;

	/* find tagged parameter */
	while (totlen >= 2) {
		uint id = elt->id;
		int len = elt->len;

		/* Punt if we start seeing IDs > than target key */
		if (id > key)
			return (NULL);

		/* validate remaining totlen */
		if ((id == key) && (totlen >= (len + 2)))
			return (elt);

		elt = (bcm_tlv_t*)((uint8*)elt + (len + 2));
		totlen -= (len + 2);
	}
	return NULL;
}


/* Initialization of bcmstrbuf structure */
void
bcm_binit(struct bcmstrbuf *b, char *buf, uint size)
{
	b->origsize = b->size = size;
	b->origbuf = b->buf = buf;
}

/* Buffer sprintf wrapper to guard against buffer overflow */
int
bcm_bprintf(struct bcmstrbuf *b, const char *fmt, ...)
{
	va_list ap;
	int r;

	va_start(ap, fmt);
	r = vsnprintf(b->buf, b->size, fmt, ap);

	/* Non Ansi C99 compliant returns -1,
	 * Ansi compliant return r >= b->size,
	 * bcmstdlib returns 0, handle all
	 */
	if ((r == -1) || (r >= (int)b->size) || (r == 0))
	{
		b->size = 0;
	}
	else
	{
		b->size -= r;
		b->buf += r;
	}

	va_end(ap);

	return r;
}