forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 17
/
lec.c
2409 lines (2163 loc) · 63.3 KB
/
lec.c
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
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* lec.c: Lan Emulation driver
*
* Marko Kiiskila <[email protected]>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/bitops.h>
#include <linux/capability.h>
/* We are ethernet device */
#include <linux/if_ether.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <net/sock.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <asm/byteorder.h>
#include <linux/uaccess.h>
#include <net/arp.h>
#include <net/dst.h>
#include <linux/proc_fs.h>
#include <linux/spinlock.h>
#include <linux/seq_file.h>
/* TokenRing if needed */
#ifdef CONFIG_TR
#include <linux/trdevice.h>
#endif
/* And atm device */
#include <linux/atmdev.h>
#include <linux/atmlec.h>
/* Proxy LEC knows about bridging */
#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
#include "../bridge/br_private.h"
static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
#endif
/* Modular too */
#include <linux/module.h>
#include <linux/init.h>
#include "lec.h"
#include "lec_arpc.h"
#include "resources.h"
#define DUMP_PACKETS 0 /*
* 0 = None,
* 1 = 30 first bytes
* 2 = Whole packet
*/
#define LEC_UNRES_QUE_LEN 8 /*
* number of tx packets to queue for a
* single destination while waiting for SVC
*/
static int lec_open(struct net_device *dev);
static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
struct net_device *dev);
static int lec_close(struct net_device *dev);
static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
const unsigned char *mac_addr);
static int lec_arp_remove(struct lec_priv *priv,
struct lec_arp_table *to_remove);
/* LANE2 functions */
static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
const u8 *tlvs, u32 sizeoftlvs);
static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
u8 **tlvs, u32 *sizeoftlvs);
static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
const u8 *tlvs, u32 sizeoftlvs);
static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
unsigned long permanent);
static void lec_arp_check_empties(struct lec_priv *priv,
struct atm_vcc *vcc, struct sk_buff *skb);
static void lec_arp_destroy(struct lec_priv *priv);
static void lec_arp_init(struct lec_priv *priv);
static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
const unsigned char *mac_to_find,
int is_rdesc,
struct lec_arp_table **ret_entry);
static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
const unsigned char *atm_addr,
unsigned long remoteflag,
unsigned int targetless_le_arp);
static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
static void lec_set_flush_tran_id(struct lec_priv *priv,
const unsigned char *atm_addr,
unsigned long tran_id);
static void lec_vcc_added(struct lec_priv *priv,
const struct atmlec_ioc *ioc_data,
struct atm_vcc *vcc,
void (*old_push)(struct atm_vcc *vcc,
struct sk_buff *skb));
static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
/* must be done under lec_arp_lock */
static inline void lec_arp_hold(struct lec_arp_table *entry)
{
atomic_inc(&entry->usage);
}
static inline void lec_arp_put(struct lec_arp_table *entry)
{
if (atomic_dec_and_test(&entry->usage))
kfree(entry);
}
static struct lane2_ops lane2_ops = {
lane2_resolve, /* resolve, spec 3.1.3 */
lane2_associate_req, /* associate_req, spec 3.1.4 */
NULL /* associate indicator, spec 3.1.5 */
};
static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
/* Device structures */
static struct net_device *dev_lec[MAX_LEC_ITF];
#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
{
char *buff;
struct lec_priv *priv;
/*
* Check if this is a BPDU. If so, ask zeppelin to send
* LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
* as the Config BPDU has
*/
buff = skb->data + skb->dev->hard_header_len;
if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
struct sock *sk;
struct sk_buff *skb2;
struct atmlec_msg *mesg;
skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
if (skb2 == NULL)
return;
skb2->len = sizeof(struct atmlec_msg);
mesg = (struct atmlec_msg *)skb2->data;
mesg->type = l_topology_change;
buff += 4;
mesg->content.normal.flag = *buff & 0x01;
/* 0x01 is topology change */
priv = netdev_priv(dev);
atm_force_charge(priv->lecd, skb2->truesize);
sk = sk_atm(priv->lecd);
skb_queue_tail(&sk->sk_receive_queue, skb2);
sk->sk_data_ready(sk, skb2->len);
}
}
#endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
/*
* Modelled after tr_type_trans
* All multicast and ARE or STE frames go to BUS.
* Non source routed frames go by destination address.
* Last hop source routed frames go by destination address.
* Not last hop source routed frames go by _next_ route descriptor.
* Returns pointer to destination MAC address or fills in rdesc
* and returns NULL.
*/
#ifdef CONFIG_TR
static unsigned char *get_tr_dst(unsigned char *packet, unsigned char *rdesc)
{
struct trh_hdr *trh;
unsigned int riflen, num_rdsc;
trh = (struct trh_hdr *)packet;
if (trh->daddr[0] & (uint8_t) 0x80)
return bus_mac; /* multicast */
if (trh->saddr[0] & TR_RII) {
riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8;
if ((ntohs(trh->rcf) >> 13) != 0)
return bus_mac; /* ARE or STE */
} else
return trh->daddr; /* not source routed */
if (riflen < 6)
return trh->daddr; /* last hop, source routed */
/* riflen is 6 or more, packet has more than one route descriptor */
num_rdsc = (riflen / 2) - 1;
memset(rdesc, 0, ETH_ALEN);
/* offset 4 comes from LAN destination field in LE control frames */
if (trh->rcf & htons((uint16_t) TR_RCF_DIR_BIT))
memcpy(&rdesc[4], &trh->rseg[num_rdsc - 2], sizeof(__be16));
else {
memcpy(&rdesc[4], &trh->rseg[1], sizeof(__be16));
rdesc[5] = ((ntohs(trh->rseg[0]) & 0x000f) | (rdesc[5] & 0xf0));
}
return NULL;
}
#endif /* CONFIG_TR */
/*
* Open/initialize the netdevice. This is called (in the current kernel)
* sometime after booting when the 'ifconfig' program is run.
*
* This routine should set everything up anew at each open, even
* registers that "should" only need to be set once at boot, so that
* there is non-reboot way to recover if something goes wrong.
*/
static int lec_open(struct net_device *dev)
{
netif_start_queue(dev);
return 0;
}
static void
lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
{
struct net_device *dev = skb->dev;
ATM_SKB(skb)->vcc = vcc;
ATM_SKB(skb)->atm_options = vcc->atm_options;
atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
if (vcc->send(vcc, skb) < 0) {
dev->stats.tx_dropped++;
return;
}
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
}
static void lec_tx_timeout(struct net_device *dev)
{
pr_info("%s\n", dev->name);
dev->trans_start = jiffies;
netif_wake_queue(dev);
}
static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct sk_buff *skb2;
struct lec_priv *priv = netdev_priv(dev);
struct lecdatahdr_8023 *lec_h;
struct atm_vcc *vcc;
struct lec_arp_table *entry;
unsigned char *dst;
int min_frame_size;
#ifdef CONFIG_TR
unsigned char rdesc[ETH_ALEN]; /* Token Ring route descriptor */
#endif
int is_rdesc;
pr_debug("called\n");
if (!priv->lecd) {
pr_info("%s:No lecd attached\n", dev->name);
dev->stats.tx_errors++;
netif_stop_queue(dev);
kfree_skb(skb);
return NETDEV_TX_OK;
}
pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
(long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
(long)skb_end_pointer(skb));
#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
lec_handle_bridge(skb, dev);
#endif
/* Make sure we have room for lec_id */
if (skb_headroom(skb) < 2) {
pr_debug("reallocating skb\n");
skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
kfree_skb(skb);
if (skb2 == NULL)
return NETDEV_TX_OK;
skb = skb2;
}
skb_push(skb, 2);
/* Put le header to place, works for TokenRing too */
lec_h = (struct lecdatahdr_8023 *)skb->data;
lec_h->le_header = htons(priv->lecid);
#ifdef CONFIG_TR
/*
* Ugly. Use this to realign Token Ring packets for
* e.g. PCA-200E driver.
*/
if (priv->is_trdev) {
skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
kfree_skb(skb);
if (skb2 == NULL)
return NETDEV_TX_OK;
skb = skb2;
}
#endif
#if DUMP_PACKETS >= 2
#define MAX_DUMP_SKB 99
#elif DUMP_PACKETS >= 1
#define MAX_DUMP_SKB 30
#endif
#if DUMP_PACKETS >= 1
printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
dev->name, skb->len, priv->lecid);
print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
skb->data, min(skb->len, MAX_DUMP_SKB), true);
#endif /* DUMP_PACKETS >= 1 */
/* Minimum ethernet-frame size */
#ifdef CONFIG_TR
if (priv->is_trdev)
min_frame_size = LEC_MINIMUM_8025_SIZE;
else
#endif
min_frame_size = LEC_MINIMUM_8023_SIZE;
if (skb->len < min_frame_size) {
if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
skb2 = skb_copy_expand(skb, 0,
min_frame_size - skb->truesize,
GFP_ATOMIC);
dev_kfree_skb(skb);
if (skb2 == NULL) {
dev->stats.tx_dropped++;
return NETDEV_TX_OK;
}
skb = skb2;
}
skb_put(skb, min_frame_size - skb->len);
}
/* Send to right vcc */
is_rdesc = 0;
dst = lec_h->h_dest;
#ifdef CONFIG_TR
if (priv->is_trdev) {
dst = get_tr_dst(skb->data + 2, rdesc);
if (dst == NULL) {
dst = rdesc;
is_rdesc = 1;
}
}
#endif
entry = NULL;
vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
dev->name, vcc, vcc ? vcc->flags : 0, entry);
if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
pr_debug("%s:queuing packet, MAC address %pM\n",
dev->name, lec_h->h_dest);
skb_queue_tail(&entry->tx_wait, skb);
} else {
pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
dev->name, lec_h->h_dest);
dev->stats.tx_dropped++;
dev_kfree_skb(skb);
}
goto out;
}
#if DUMP_PACKETS > 0
printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
dev->name, vcc->vpi, vcc->vci);
#endif /* DUMP_PACKETS > 0 */
while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
lec_send(vcc, skb2);
}
lec_send(vcc, skb);
if (!atm_may_send(vcc, 0)) {
struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
vpriv->xoff = 1;
netif_stop_queue(dev);
/*
* vcc->pop() might have occurred in between, making
* the vcc usuable again. Since xmit is serialized,
* this is the only situation we have to re-test.
*/
if (atm_may_send(vcc, 0))
netif_wake_queue(dev);
}
out:
if (entry)
lec_arp_put(entry);
dev->trans_start = jiffies;
return NETDEV_TX_OK;
}
/* The inverse routine to net_open(). */
static int lec_close(struct net_device *dev)
{
netif_stop_queue(dev);
return 0;
}
static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
{
unsigned long flags;
struct net_device *dev = (struct net_device *)vcc->proto_data;
struct lec_priv *priv = netdev_priv(dev);
struct atmlec_msg *mesg;
struct lec_arp_table *entry;
int i;
char *tmp; /* FIXME */
atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
mesg = (struct atmlec_msg *)skb->data;
tmp = skb->data;
tmp += sizeof(struct atmlec_msg);
pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
switch (mesg->type) {
case l_set_mac_addr:
for (i = 0; i < 6; i++)
dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
break;
case l_del_mac_addr:
for (i = 0; i < 6; i++)
dev->dev_addr[i] = 0;
break;
case l_addr_delete:
lec_addr_delete(priv, mesg->content.normal.atm_addr,
mesg->content.normal.flag);
break;
case l_topology_change:
priv->topology_change = mesg->content.normal.flag;
break;
case l_flush_complete:
lec_flush_complete(priv, mesg->content.normal.flag);
break;
case l_narp_req: /* LANE2: see 7.1.35 in the lane2 spec */
spin_lock_irqsave(&priv->lec_arp_lock, flags);
entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
lec_arp_remove(priv, entry);
spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
if (mesg->content.normal.no_source_le_narp)
break;
/* FALL THROUGH */
case l_arp_update:
lec_arp_update(priv, mesg->content.normal.mac_addr,
mesg->content.normal.atm_addr,
mesg->content.normal.flag,
mesg->content.normal.targetless_le_arp);
pr_debug("in l_arp_update\n");
if (mesg->sizeoftlvs != 0) { /* LANE2 3.1.5 */
pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
mesg->sizeoftlvs);
lane2_associate_ind(dev, mesg->content.normal.mac_addr,
tmp, mesg->sizeoftlvs);
}
break;
case l_config:
priv->maximum_unknown_frame_count =
mesg->content.config.maximum_unknown_frame_count;
priv->max_unknown_frame_time =
(mesg->content.config.max_unknown_frame_time * HZ);
priv->max_retry_count = mesg->content.config.max_retry_count;
priv->aging_time = (mesg->content.config.aging_time * HZ);
priv->forward_delay_time =
(mesg->content.config.forward_delay_time * HZ);
priv->arp_response_time =
(mesg->content.config.arp_response_time * HZ);
priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
priv->path_switching_delay =
(mesg->content.config.path_switching_delay * HZ);
priv->lane_version = mesg->content.config.lane_version;
/* LANE2 */
priv->lane2_ops = NULL;
if (priv->lane_version > 1)
priv->lane2_ops = &lane2_ops;
if (dev_set_mtu(dev, mesg->content.config.mtu))
pr_info("%s: change_mtu to %d failed\n",
dev->name, mesg->content.config.mtu);
priv->is_proxy = mesg->content.config.is_proxy;
break;
case l_flush_tran_id:
lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
mesg->content.normal.flag);
break;
case l_set_lecid:
priv->lecid =
(unsigned short)(0xffff & mesg->content.normal.flag);
break;
case l_should_bridge:
#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
{
pr_debug("%s: bridge zeppelin asks about %pM\n",
dev->name, mesg->content.proxy.mac_addr);
if (br_fdb_test_addr_hook == NULL)
break;
if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
/* hit from bridge table, send LE_ARP_RESPONSE */
struct sk_buff *skb2;
struct sock *sk;
pr_debug("%s: entry found, responding to zeppelin\n",
dev->name);
skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
if (skb2 == NULL)
break;
skb2->len = sizeof(struct atmlec_msg);
skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
atm_force_charge(priv->lecd, skb2->truesize);
sk = sk_atm(priv->lecd);
skb_queue_tail(&sk->sk_receive_queue, skb2);
sk->sk_data_ready(sk, skb2->len);
}
}
#endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
break;
default:
pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
dev_kfree_skb(skb);
return -EINVAL;
}
dev_kfree_skb(skb);
return 0;
}
static void lec_atm_close(struct atm_vcc *vcc)
{
struct sk_buff *skb;
struct net_device *dev = (struct net_device *)vcc->proto_data;
struct lec_priv *priv = netdev_priv(dev);
priv->lecd = NULL;
/* Do something needful? */
netif_stop_queue(dev);
lec_arp_destroy(priv);
if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
pr_info("%s closing with messages pending\n", dev->name);
while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
atm_return(vcc, skb->truesize);
dev_kfree_skb(skb);
}
pr_info("%s: Shut down!\n", dev->name);
module_put(THIS_MODULE);
}
static struct atmdev_ops lecdev_ops = {
.close = lec_atm_close,
.send = lec_atm_send
};
static struct atm_dev lecatm_dev = {
.ops = &lecdev_ops,
.type = "lec",
.number = 999, /* dummy device number */
.lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
};
/*
* LANE2: new argument struct sk_buff *data contains
* the LE_ARP based TLVs introduced in the LANE2 spec
*/
static int
send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
const unsigned char *mac_addr, const unsigned char *atm_addr,
struct sk_buff *data)
{
struct sock *sk;
struct sk_buff *skb;
struct atmlec_msg *mesg;
if (!priv || !priv->lecd)
return -1;
skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
if (!skb)
return -1;
skb->len = sizeof(struct atmlec_msg);
mesg = (struct atmlec_msg *)skb->data;
memset(mesg, 0, sizeof(struct atmlec_msg));
mesg->type = type;
if (data != NULL)
mesg->sizeoftlvs = data->len;
if (mac_addr)
memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
else
mesg->content.normal.targetless_le_arp = 1;
if (atm_addr)
memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
atm_force_charge(priv->lecd, skb->truesize);
sk = sk_atm(priv->lecd);
skb_queue_tail(&sk->sk_receive_queue, skb);
sk->sk_data_ready(sk, skb->len);
if (data != NULL) {
pr_debug("about to send %d bytes of data\n", data->len);
atm_force_charge(priv->lecd, data->truesize);
skb_queue_tail(&sk->sk_receive_queue, data);
sk->sk_data_ready(sk, skb->len);
}
return 0;
}
/* shamelessly stolen from drivers/net/net_init.c */
static int lec_change_mtu(struct net_device *dev, int new_mtu)
{
if ((new_mtu < 68) || (new_mtu > 18190))
return -EINVAL;
dev->mtu = new_mtu;
return 0;
}
static void lec_set_multicast_list(struct net_device *dev)
{
/*
* by default, all multicast frames arrive over the bus.
* eventually support selective multicast service
*/
}
static const struct net_device_ops lec_netdev_ops = {
.ndo_open = lec_open,
.ndo_stop = lec_close,
.ndo_start_xmit = lec_start_xmit,
.ndo_change_mtu = lec_change_mtu,
.ndo_tx_timeout = lec_tx_timeout,
.ndo_set_multicast_list = lec_set_multicast_list,
};
static const unsigned char lec_ctrl_magic[] = {
0xff,
0x00,
0x01,
0x01
};
#define LEC_DATA_DIRECT_8023 2
#define LEC_DATA_DIRECT_8025 3
static int lec_is_data_direct(struct atm_vcc *vcc)
{
return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
(vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
}
static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
{
unsigned long flags;
struct net_device *dev = (struct net_device *)vcc->proto_data;
struct lec_priv *priv = netdev_priv(dev);
#if DUMP_PACKETS > 0
printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
dev->name, vcc->vpi, vcc->vci);
#endif
if (!skb) {
pr_debug("%s: null skb\n", dev->name);
lec_vcc_close(priv, vcc);
return;
}
#if DUMP_PACKETS >= 2
#define MAX_SKB_DUMP 99
#elif DUMP_PACKETS >= 1
#define MAX_SKB_DUMP 30
#endif
#if DUMP_PACKETS > 0
printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
dev->name, skb->len, priv->lecid);
print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
skb->data, min(MAX_SKB_DUMP, skb->len), true);
#endif /* DUMP_PACKETS > 0 */
if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
/* Control frame, to daemon */
struct sock *sk = sk_atm(vcc);
pr_debug("%s: To daemon\n", dev->name);
skb_queue_tail(&sk->sk_receive_queue, skb);
sk->sk_data_ready(sk, skb->len);
} else { /* Data frame, queue to protocol handlers */
struct lec_arp_table *entry;
unsigned char *src, *dst;
atm_return(vcc, skb->truesize);
if (*(__be16 *) skb->data == htons(priv->lecid) ||
!priv->lecd || !(dev->flags & IFF_UP)) {
/*
* Probably looping back, or if lecd is missing,
* lecd has gone down
*/
pr_debug("Ignoring frame...\n");
dev_kfree_skb(skb);
return;
}
#ifdef CONFIG_TR
if (priv->is_trdev)
dst = ((struct lecdatahdr_8025 *)skb->data)->h_dest;
else
#endif
dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
/*
* If this is a Data Direct VCC, and the VCC does not match
* the LE_ARP cache entry, delete the LE_ARP cache entry.
*/
spin_lock_irqsave(&priv->lec_arp_lock, flags);
if (lec_is_data_direct(vcc)) {
#ifdef CONFIG_TR
if (priv->is_trdev)
src =
((struct lecdatahdr_8025 *)skb->data)->
h_source;
else
#endif
src =
((struct lecdatahdr_8023 *)skb->data)->
h_source;
entry = lec_arp_find(priv, src);
if (entry && entry->vcc != vcc) {
lec_arp_remove(priv, entry);
lec_arp_put(entry);
}
}
spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
!priv->is_proxy && /* Proxy wants all the packets */
memcmp(dst, dev->dev_addr, dev->addr_len)) {
dev_kfree_skb(skb);
return;
}
if (!hlist_empty(&priv->lec_arp_empty_ones))
lec_arp_check_empties(priv, vcc, skb);
skb_pull(skb, 2); /* skip lec_id */
#ifdef CONFIG_TR
if (priv->is_trdev)
skb->protocol = tr_type_trans(skb, dev);
else
#endif
skb->protocol = eth_type_trans(skb, dev);
dev->stats.rx_packets++;
dev->stats.rx_bytes += skb->len;
memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
netif_rx(skb);
}
}
static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
{
struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
struct net_device *dev = skb->dev;
if (vpriv == NULL) {
pr_info("vpriv = NULL!?!?!?\n");
return;
}
vpriv->old_pop(vcc, skb);
if (vpriv->xoff && atm_may_send(vcc, 0)) {
vpriv->xoff = 0;
if (netif_running(dev) && netif_queue_stopped(dev))
netif_wake_queue(dev);
}
}
static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
{
struct lec_vcc_priv *vpriv;
int bytes_left;
struct atmlec_ioc ioc_data;
/* Lecd must be up in this case */
bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
if (bytes_left != 0)
pr_info("copy from user failed for %d bytes\n", bytes_left);
if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
!dev_lec[ioc_data.dev_num])
return -EINVAL;
vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
if (!vpriv)
return -ENOMEM;
vpriv->xoff = 0;
vpriv->old_pop = vcc->pop;
vcc->user_back = vpriv;
vcc->pop = lec_pop;
lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
&ioc_data, vcc, vcc->push);
vcc->proto_data = dev_lec[ioc_data.dev_num];
vcc->push = lec_push;
return 0;
}
static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
{
if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
return -EINVAL;
vcc->proto_data = dev_lec[arg];
return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
}
/* Initialize device. */
static int lecd_attach(struct atm_vcc *vcc, int arg)
{
int i;
struct lec_priv *priv;
if (arg < 0)
i = 0;
else
i = arg;
#ifdef CONFIG_TR
if (arg >= MAX_LEC_ITF)
return -EINVAL;
#else /* Reserve the top NUM_TR_DEVS for TR */
if (arg >= (MAX_LEC_ITF - NUM_TR_DEVS))
return -EINVAL;
#endif
if (!dev_lec[i]) {
int is_trdev, size;
is_trdev = 0;
if (i >= (MAX_LEC_ITF - NUM_TR_DEVS))
is_trdev = 1;
size = sizeof(struct lec_priv);
#ifdef CONFIG_TR
if (is_trdev)
dev_lec[i] = alloc_trdev(size);
else
#endif
dev_lec[i] = alloc_etherdev(size);
if (!dev_lec[i])
return -ENOMEM;
dev_lec[i]->netdev_ops = &lec_netdev_ops;
snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
if (register_netdev(dev_lec[i])) {
free_netdev(dev_lec[i]);
return -EINVAL;
}
priv = netdev_priv(dev_lec[i]);
priv->is_trdev = is_trdev;
} else {
priv = netdev_priv(dev_lec[i]);
if (priv->lecd)
return -EADDRINUSE;
}
lec_arp_init(priv);
priv->itfnum = i; /* LANE2 addition */
priv->lecd = vcc;
vcc->dev = &lecatm_dev;
vcc_insert_socket(sk_atm(vcc));
vcc->proto_data = dev_lec[i];
set_bit(ATM_VF_META, &vcc->flags);
set_bit(ATM_VF_READY, &vcc->flags);
/* Set default values to these variables */
priv->maximum_unknown_frame_count = 1;
priv->max_unknown_frame_time = (1 * HZ);
priv->vcc_timeout_period = (1200 * HZ);
priv->max_retry_count = 1;
priv->aging_time = (300 * HZ);
priv->forward_delay_time = (15 * HZ);
priv->topology_change = 0;
priv->arp_response_time = (1 * HZ);
priv->flush_timeout = (4 * HZ);
priv->path_switching_delay = (6 * HZ);
if (dev_lec[i]->flags & IFF_UP)
netif_start_queue(dev_lec[i]);
__module_get(THIS_MODULE);
return i;
}
#ifdef CONFIG_PROC_FS
static const char *lec_arp_get_status_string(unsigned char status)
{
static const char *const lec_arp_status_string[] = {
"ESI_UNKNOWN ",
"ESI_ARP_PENDING ",
"ESI_VC_PENDING ",
"<Undefined> ",
"ESI_FLUSH_PENDING ",
"ESI_FORWARD_DIRECT"
};
if (status > ESI_FORWARD_DIRECT)
status = 3; /* ESI_UNDEFINED */
return lec_arp_status_string[status];
}
static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
{
int i;
for (i = 0; i < ETH_ALEN; i++)
seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
seq_printf(seq, " ");
for (i = 0; i < ATM_ESA_LEN; i++)
seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
entry->flags & 0xffff);
if (entry->vcc)
seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
else
seq_printf(seq, " ");
if (entry->recv_vcc) {
seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi,
entry->recv_vcc->vci);
}
seq_putc(seq, '\n');
}
struct lec_state {
unsigned long flags;
struct lec_priv *locked;
struct hlist_node *node;
struct net_device *dev;
int itf;
int arp_table;
int misc_table;
};
static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
loff_t *l)
{
struct hlist_node *e = state->node;
struct lec_arp_table *tmp;
if (!e)
e = tbl->first;
if (e == SEQ_START_TOKEN) {
e = tbl->first;
--*l;
}
hlist_for_each_entry_from(tmp, e, next) {
if (--*l < 0)
break;
}
state->node = e;
return (*l < 0) ? state : NULL;
}
static void *lec_arp_walk(struct lec_state *state, loff_t *l,
struct lec_priv *priv)
{
void *v = NULL;
int p;
for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
if (v)
break;
}
state->arp_table = p;
return v;
}
static void *lec_misc_walk(struct lec_state *state, loff_t *l,
struct lec_priv *priv)
{
struct hlist_head *lec_misc_tables[] = {
&priv->lec_arp_empty_ones,
&priv->lec_no_forward,
&priv->mcast_fwds
};
void *v = NULL;
int q;
for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
v = lec_tbl_walk(state, lec_misc_tables[q], l);
if (v)
break;
}
state->misc_table = q;
return v;
}