forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 0
/
mpc.c
1535 lines (1322 loc) · 38.2 KB
/
mpc.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
// SPDX-License-Identifier: GPL-2.0-only
#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/capability.h>
#include <linux/seq_file.h>
/* We are an 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 <linux/uaccess.h>
#include <asm/byteorder.h>
#include <net/checksum.h> /* for ip_fast_csum() */
#include <net/arp.h>
#include <net/dst.h>
#include <linux/proc_fs.h>
/* And atm device */
#include <linux/atmdev.h>
#include <linux/atmlec.h>
#include <linux/atmmpc.h>
/* Modular too */
#include <linux/module.h>
#include "lec.h"
#include "mpc.h"
#include "resources.h"
/*
* mpc.c: Implementation of MPOA client kernel part
*/
#if 0
#define dprintk(format, args...) \
printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args)
#define dprintk_cont(format, args...) printk(KERN_CONT format, ##args)
#else
#define dprintk(format, args...) \
do { if (0) \
printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args);\
} while (0)
#define dprintk_cont(format, args...) \
do { if (0) printk(KERN_CONT format, ##args); } while (0)
#endif
#if 0
#define ddprintk(format, args...) \
printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args)
#define ddprintk_cont(format, args...) printk(KERN_CONT format, ##args)
#else
#define ddprintk(format, args...) \
do { if (0) \
printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args);\
} while (0)
#define ddprintk_cont(format, args...) \
do { if (0) printk(KERN_CONT format, ##args); } while (0)
#endif
/* mpc_daemon -> kernel */
static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc);
static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc);
static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
static void mps_death(struct k_message *msg, struct mpoa_client *mpc);
static void clean_up(struct k_message *msg, struct mpoa_client *mpc,
int action);
static void MPOA_cache_impos_rcvd(struct k_message *msg,
struct mpoa_client *mpc);
static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg,
struct mpoa_client *mpc);
static void set_mps_mac_addr_rcvd(struct k_message *mesg,
struct mpoa_client *mpc);
static const uint8_t *copy_macs(struct mpoa_client *mpc,
const uint8_t *router_mac,
const uint8_t *tlvs, uint8_t mps_macs,
uint8_t device_type);
static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry);
static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc);
static void mpoad_close(struct atm_vcc *vcc);
static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb);
static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb);
static netdev_tx_t mpc_send_packet(struct sk_buff *skb,
struct net_device *dev);
static int mpoa_event_listener(struct notifier_block *mpoa_notifier,
unsigned long event, void *dev);
static void mpc_timer_refresh(void);
static void mpc_cache_check(struct timer_list *unused);
static struct llc_snap_hdr llc_snap_mpoa_ctrl = {
0xaa, 0xaa, 0x03,
{0x00, 0x00, 0x5e},
{0x00, 0x03} /* For MPOA control PDUs */
};
static struct llc_snap_hdr llc_snap_mpoa_data = {
0xaa, 0xaa, 0x03,
{0x00, 0x00, 0x00},
{0x08, 0x00} /* This is for IP PDUs only */
};
static struct llc_snap_hdr llc_snap_mpoa_data_tagged = {
0xaa, 0xaa, 0x03,
{0x00, 0x00, 0x00},
{0x88, 0x4c} /* This is for tagged data PDUs */
};
static struct notifier_block mpoa_notifier = {
mpoa_event_listener,
NULL,
0
};
struct mpoa_client *mpcs = NULL; /* FIXME */
static struct atm_mpoa_qos *qos_head = NULL;
static DEFINE_TIMER(mpc_timer, mpc_cache_check);
static struct mpoa_client *find_mpc_by_itfnum(int itf)
{
struct mpoa_client *mpc;
mpc = mpcs; /* our global linked list */
while (mpc != NULL) {
if (mpc->dev_num == itf)
return mpc;
mpc = mpc->next;
}
return NULL; /* not found */
}
static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc)
{
struct mpoa_client *mpc;
mpc = mpcs; /* our global linked list */
while (mpc != NULL) {
if (mpc->mpoad_vcc == vcc)
return mpc;
mpc = mpc->next;
}
return NULL; /* not found */
}
static struct mpoa_client *find_mpc_by_lec(struct net_device *dev)
{
struct mpoa_client *mpc;
mpc = mpcs; /* our global linked list */
while (mpc != NULL) {
if (mpc->dev == dev)
return mpc;
mpc = mpc->next;
}
return NULL; /* not found */
}
/*
* Functions for managing QoS list
*/
/*
* Overwrites the old entry or makes a new one.
*/
struct atm_mpoa_qos *atm_mpoa_add_qos(__be32 dst_ip, struct atm_qos *qos)
{
struct atm_mpoa_qos *entry;
entry = atm_mpoa_search_qos(dst_ip);
if (entry != NULL) {
entry->qos = *qos;
return entry;
}
entry = kmalloc(sizeof(struct atm_mpoa_qos), GFP_KERNEL);
if (entry == NULL) {
pr_info("mpoa: out of memory\n");
return entry;
}
entry->ipaddr = dst_ip;
entry->qos = *qos;
entry->next = qos_head;
qos_head = entry;
return entry;
}
struct atm_mpoa_qos *atm_mpoa_search_qos(__be32 dst_ip)
{
struct atm_mpoa_qos *qos;
qos = qos_head;
while (qos) {
if (qos->ipaddr == dst_ip)
break;
qos = qos->next;
}
return qos;
}
/*
* Returns 0 for failure
*/
int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry)
{
struct atm_mpoa_qos *curr;
if (entry == NULL)
return 0;
if (entry == qos_head) {
qos_head = qos_head->next;
kfree(entry);
return 1;
}
curr = qos_head;
while (curr != NULL) {
if (curr->next == entry) {
curr->next = entry->next;
kfree(entry);
return 1;
}
curr = curr->next;
}
return 0;
}
/* this is buggered - we need locking for qos_head */
void atm_mpoa_disp_qos(struct seq_file *m)
{
struct atm_mpoa_qos *qos;
qos = qos_head;
seq_printf(m, "QoS entries for shortcuts:\n");
seq_printf(m, "IP address\n TX:max_pcr pcr min_pcr max_cdv max_sdu\n RX:max_pcr pcr min_pcr max_cdv max_sdu\n");
while (qos != NULL) {
seq_printf(m, "%pI4\n %-7d %-7d %-7d %-7d %-7d\n %-7d %-7d %-7d %-7d %-7d\n",
&qos->ipaddr,
qos->qos.txtp.max_pcr,
qos->qos.txtp.pcr,
qos->qos.txtp.min_pcr,
qos->qos.txtp.max_cdv,
qos->qos.txtp.max_sdu,
qos->qos.rxtp.max_pcr,
qos->qos.rxtp.pcr,
qos->qos.rxtp.min_pcr,
qos->qos.rxtp.max_cdv,
qos->qos.rxtp.max_sdu);
qos = qos->next;
}
}
static struct net_device *find_lec_by_itfnum(int itf)
{
struct net_device *dev;
char name[IFNAMSIZ];
sprintf(name, "lec%d", itf);
dev = dev_get_by_name(&init_net, name);
return dev;
}
static struct mpoa_client *alloc_mpc(void)
{
struct mpoa_client *mpc;
mpc = kzalloc(sizeof(struct mpoa_client), GFP_KERNEL);
if (mpc == NULL)
return NULL;
rwlock_init(&mpc->ingress_lock);
rwlock_init(&mpc->egress_lock);
mpc->next = mpcs;
atm_mpoa_init_cache(mpc);
mpc->parameters.mpc_p1 = MPC_P1;
mpc->parameters.mpc_p2 = MPC_P2;
memset(mpc->parameters.mpc_p3, 0, sizeof(mpc->parameters.mpc_p3));
mpc->parameters.mpc_p4 = MPC_P4;
mpc->parameters.mpc_p5 = MPC_P5;
mpc->parameters.mpc_p6 = MPC_P6;
mpcs = mpc;
return mpc;
}
/*
*
* start_mpc() puts the MPC on line. All the packets destined
* to the lec underneath us are now being monitored and
* shortcuts will be established.
*
*/
static void start_mpc(struct mpoa_client *mpc, struct net_device *dev)
{
dprintk("(%s)\n", mpc->dev->name);
if (!dev->netdev_ops)
pr_info("(%s) not starting\n", dev->name);
else {
mpc->old_ops = dev->netdev_ops;
mpc->new_ops = *mpc->old_ops;
mpc->new_ops.ndo_start_xmit = mpc_send_packet;
dev->netdev_ops = &mpc->new_ops;
}
}
static void stop_mpc(struct mpoa_client *mpc)
{
struct net_device *dev = mpc->dev;
dprintk("(%s)", mpc->dev->name);
/* Lets not nullify lec device's dev->hard_start_xmit */
if (dev->netdev_ops != &mpc->new_ops) {
dprintk_cont(" mpc already stopped, not fatal\n");
return;
}
dprintk_cont("\n");
dev->netdev_ops = mpc->old_ops;
mpc->old_ops = NULL;
/* close_shortcuts(mpc); ??? FIXME */
}
static const char *mpoa_device_type_string(char type) __attribute__ ((unused));
static const char *mpoa_device_type_string(char type)
{
switch (type) {
case NON_MPOA:
return "non-MPOA device";
case MPS:
return "MPS";
case MPC:
return "MPC";
case MPS_AND_MPC:
return "both MPS and MPC";
}
return "unspecified (non-MPOA) device";
}
/*
* lec device calls this via its netdev_priv(dev)->lane2_ops
* ->associate_indicator() when it sees a TLV in LE_ARP packet.
* We fill in the pointer above when we see a LANE2 lec initializing
* See LANE2 spec 3.1.5
*
* Quite a big and ugly function but when you look at it
* all it does is to try to locate and parse MPOA Device
* Type TLV.
* We give our lec a pointer to this function and when the
* lec sees a TLV it uses the pointer to call this function.
*
*/
static void lane2_assoc_ind(struct net_device *dev, const u8 *mac_addr,
const u8 *tlvs, u32 sizeoftlvs)
{
uint32_t type;
uint8_t length, mpoa_device_type, number_of_mps_macs;
const uint8_t *end_of_tlvs;
struct mpoa_client *mpc;
mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */
dprintk("(%s) received TLV(s), ", dev->name);
dprintk("total length of all TLVs %d\n", sizeoftlvs);
mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
if (mpc == NULL) {
pr_info("(%s) no mpc\n", dev->name);
return;
}
end_of_tlvs = tlvs + sizeoftlvs;
while (end_of_tlvs - tlvs >= 5) {
type = ((tlvs[0] << 24) | (tlvs[1] << 16) |
(tlvs[2] << 8) | tlvs[3]);
length = tlvs[4];
tlvs += 5;
dprintk(" type 0x%x length %02x\n", type, length);
if (tlvs + length > end_of_tlvs) {
pr_info("TLV value extends past its buffer, aborting parse\n");
return;
}
if (type == 0) {
pr_info("mpoa: (%s) TLV type was 0, returning\n",
dev->name);
return;
}
if (type != TLV_MPOA_DEVICE_TYPE) {
tlvs += length;
continue; /* skip other TLVs */
}
mpoa_device_type = *tlvs++;
number_of_mps_macs = *tlvs++;
dprintk("(%s) MPOA device type '%s', ",
dev->name, mpoa_device_type_string(mpoa_device_type));
if (mpoa_device_type == MPS_AND_MPC &&
length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */
pr_info("(%s) short MPOA Device Type TLV\n",
dev->name);
continue;
}
if ((mpoa_device_type == MPS || mpoa_device_type == MPC) &&
length < 22 + number_of_mps_macs*ETH_ALEN) {
pr_info("(%s) short MPOA Device Type TLV\n", dev->name);
continue;
}
if (mpoa_device_type != MPS &&
mpoa_device_type != MPS_AND_MPC) {
dprintk("ignoring non-MPS device ");
if (mpoa_device_type == MPC)
tlvs += 20;
continue; /* we are only interested in MPSs */
}
if (number_of_mps_macs == 0 &&
mpoa_device_type == MPS_AND_MPC) {
pr_info("(%s) MPS_AND_MPC has zero MACs\n", dev->name);
continue; /* someone should read the spec */
}
dprintk_cont("this MPS has %d MAC addresses\n",
number_of_mps_macs);
/*
* ok, now we can go and tell our daemon
* the control address of MPS
*/
send_set_mps_ctrl_addr(tlvs, mpc);
tlvs = copy_macs(mpc, mac_addr, tlvs,
number_of_mps_macs, mpoa_device_type);
if (tlvs == NULL)
return;
}
if (end_of_tlvs - tlvs != 0)
pr_info("(%s) ignoring %zd bytes of trailing TLV garbage\n",
dev->name, end_of_tlvs - tlvs);
}
/*
* Store at least advertizing router's MAC address
* plus the possible MAC address(es) to mpc->mps_macs.
* For a freshly allocated MPOA client mpc->mps_macs == 0.
*/
static const uint8_t *copy_macs(struct mpoa_client *mpc,
const uint8_t *router_mac,
const uint8_t *tlvs, uint8_t mps_macs,
uint8_t device_type)
{
int num_macs;
num_macs = (mps_macs > 1) ? mps_macs : 1;
if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */
if (mpc->number_of_mps_macs != 0)
kfree(mpc->mps_macs);
mpc->number_of_mps_macs = 0;
mpc->mps_macs = kmalloc_array(ETH_ALEN, num_macs, GFP_KERNEL);
if (mpc->mps_macs == NULL) {
pr_info("(%s) out of mem\n", mpc->dev->name);
return NULL;
}
}
ether_addr_copy(mpc->mps_macs, router_mac);
tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20;
if (mps_macs > 0)
memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN);
tlvs += mps_macs*ETH_ALEN;
mpc->number_of_mps_macs = num_macs;
return tlvs;
}
static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
{
in_cache_entry *entry;
struct iphdr *iph;
char *buff;
__be32 ipaddr = 0;
static struct {
struct llc_snap_hdr hdr;
__be32 tag;
} tagged_llc_snap_hdr = {
{0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}},
0
};
buff = skb->data + mpc->dev->hard_header_len;
iph = (struct iphdr *)buff;
ipaddr = iph->daddr;
ddprintk("(%s) ipaddr 0x%x\n",
mpc->dev->name, ipaddr);
entry = mpc->in_ops->get(ipaddr, mpc);
if (entry == NULL) {
entry = mpc->in_ops->add_entry(ipaddr, mpc);
if (entry != NULL)
mpc->in_ops->put(entry);
return 1;
}
/* threshold not exceeded or VCC not ready */
if (mpc->in_ops->cache_hit(entry, mpc) != OPEN) {
ddprintk("(%s) cache_hit: returns != OPEN\n",
mpc->dev->name);
mpc->in_ops->put(entry);
return 1;
}
ddprintk("(%s) using shortcut\n",
mpc->dev->name);
/* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */
if (iph->ttl <= 1) {
ddprintk("(%s) IP ttl = %u, using LANE\n",
mpc->dev->name, iph->ttl);
mpc->in_ops->put(entry);
return 1;
}
iph->ttl--;
iph->check = 0;
iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
if (entry->ctrl_info.tag != 0) {
ddprintk("(%s) adding tag 0x%x\n",
mpc->dev->name, entry->ctrl_info.tag);
tagged_llc_snap_hdr.tag = entry->ctrl_info.tag;
skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
skb_push(skb, sizeof(tagged_llc_snap_hdr));
/* add LLC/SNAP header */
skb_copy_to_linear_data(skb, &tagged_llc_snap_hdr,
sizeof(tagged_llc_snap_hdr));
} else {
skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
skb_push(skb, sizeof(struct llc_snap_hdr));
/* add LLC/SNAP header + tag */
skb_copy_to_linear_data(skb, &llc_snap_mpoa_data,
sizeof(struct llc_snap_hdr));
}
atm_account_tx(entry->shortcut, skb);
entry->shortcut->send(entry->shortcut, skb);
entry->packets_fwded++;
mpc->in_ops->put(entry);
return 0;
}
/*
* Probably needs some error checks and locking, not sure...
*/
static netdev_tx_t mpc_send_packet(struct sk_buff *skb,
struct net_device *dev)
{
struct mpoa_client *mpc;
struct ethhdr *eth;
int i = 0;
mpc = find_mpc_by_lec(dev); /* this should NEVER fail */
if (mpc == NULL) {
pr_info("(%s) no MPC found\n", dev->name);
goto non_ip;
}
eth = (struct ethhdr *)skb->data;
if (eth->h_proto != htons(ETH_P_IP))
goto non_ip; /* Multi-Protocol Over ATM :-) */
/* Weed out funny packets (e.g., AF_PACKET or raw). */
if (skb->len < ETH_HLEN + sizeof(struct iphdr))
goto non_ip;
skb_set_network_header(skb, ETH_HLEN);
if (skb->len < ETH_HLEN + ip_hdr(skb)->ihl * 4 || ip_hdr(skb)->ihl < 5)
goto non_ip;
while (i < mpc->number_of_mps_macs) {
if (ether_addr_equal(eth->h_dest, mpc->mps_macs + i * ETH_ALEN))
if (send_via_shortcut(skb, mpc) == 0) /* try shortcut */
return NETDEV_TX_OK;
i++;
}
non_ip:
return __netdev_start_xmit(mpc->old_ops, skb, dev, false);
}
static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg)
{
int bytes_left;
struct mpoa_client *mpc;
struct atmmpc_ioc ioc_data;
in_cache_entry *in_entry;
__be32 ipaddr;
bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc));
if (bytes_left != 0) {
pr_info("mpoa:Short read (missed %d bytes) from userland\n",
bytes_left);
return -EFAULT;
}
ipaddr = ioc_data.ipaddr;
if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
return -EINVAL;
mpc = find_mpc_by_itfnum(ioc_data.dev_num);
if (mpc == NULL)
return -EINVAL;
if (ioc_data.type == MPC_SOCKET_INGRESS) {
in_entry = mpc->in_ops->get(ipaddr, mpc);
if (in_entry == NULL ||
in_entry->entry_state < INGRESS_RESOLVED) {
pr_info("(%s) did not find RESOLVED entry from ingress cache\n",
mpc->dev->name);
if (in_entry != NULL)
mpc->in_ops->put(in_entry);
return -EINVAL;
}
pr_info("(%s) attaching ingress SVC, entry = %pI4\n",
mpc->dev->name, &in_entry->ctrl_info.in_dst_ip);
in_entry->shortcut = vcc;
mpc->in_ops->put(in_entry);
} else {
pr_info("(%s) attaching egress SVC\n", mpc->dev->name);
}
vcc->proto_data = mpc->dev;
vcc->push = mpc_push;
return 0;
}
/*
*
*/
static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev)
{
struct mpoa_client *mpc;
in_cache_entry *in_entry;
eg_cache_entry *eg_entry;
mpc = find_mpc_by_lec(dev);
if (mpc == NULL) {
pr_info("(%s) close for unknown MPC\n", dev->name);
return;
}
dprintk("(%s)\n", dev->name);
in_entry = mpc->in_ops->get_by_vcc(vcc, mpc);
if (in_entry) {
dprintk("(%s) ingress SVC closed ip = %pI4\n",
mpc->dev->name, &in_entry->ctrl_info.in_dst_ip);
in_entry->shortcut = NULL;
mpc->in_ops->put(in_entry);
}
eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc);
if (eg_entry) {
dprintk("(%s) egress SVC closed\n", mpc->dev->name);
eg_entry->shortcut = NULL;
mpc->eg_ops->put(eg_entry);
}
if (in_entry == NULL && eg_entry == NULL)
dprintk("(%s) unused vcc closed\n", dev->name);
}
static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb)
{
struct net_device *dev = (struct net_device *)vcc->proto_data;
struct sk_buff *new_skb;
eg_cache_entry *eg;
struct mpoa_client *mpc;
__be32 tag;
char *tmp;
ddprintk("(%s)\n", dev->name);
if (skb == NULL) {
dprintk("(%s) null skb, closing VCC\n", dev->name);
mpc_vcc_close(vcc, dev);
return;
}
skb->dev = dev;
if (memcmp(skb->data, &llc_snap_mpoa_ctrl,
sizeof(struct llc_snap_hdr)) == 0) {
struct sock *sk = sk_atm(vcc);
dprintk("(%s) control packet arrived\n", dev->name);
/* Pass control packets to daemon */
skb_queue_tail(&sk->sk_receive_queue, skb);
sk->sk_data_ready(sk);
return;
}
/* data coming over the shortcut */
atm_return(vcc, skb->truesize);
mpc = find_mpc_by_lec(dev);
if (mpc == NULL) {
pr_info("(%s) unknown MPC\n", dev->name);
return;
}
if (memcmp(skb->data, &llc_snap_mpoa_data_tagged,
sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */
ddprintk("(%s) tagged data packet arrived\n", dev->name);
} else if (memcmp(skb->data, &llc_snap_mpoa_data,
sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */
pr_info("(%s) Unsupported non-tagged data packet arrived. Purging\n",
dev->name);
dev_kfree_skb_any(skb);
return;
} else {
pr_info("(%s) garbage arrived, purging\n", dev->name);
dev_kfree_skb_any(skb);
return;
}
tmp = skb->data + sizeof(struct llc_snap_hdr);
tag = *(__be32 *)tmp;
eg = mpc->eg_ops->get_by_tag(tag, mpc);
if (eg == NULL) {
pr_info("mpoa: (%s) Didn't find egress cache entry, tag = %u\n",
dev->name, tag);
purge_egress_shortcut(vcc, NULL);
dev_kfree_skb_any(skb);
return;
}
/*
* See if ingress MPC is using shortcut we opened as a return channel.
* This means we have a bi-directional vcc opened by us.
*/
if (eg->shortcut == NULL) {
eg->shortcut = vcc;
pr_info("(%s) egress SVC in use\n", dev->name);
}
skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag));
/* get rid of LLC/SNAP header */
new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length);
/* LLC/SNAP is shorter than MAC header :( */
dev_kfree_skb_any(skb);
if (new_skb == NULL) {
mpc->eg_ops->put(eg);
return;
}
skb_push(new_skb, eg->ctrl_info.DH_length); /* add MAC header */
skb_copy_to_linear_data(new_skb, eg->ctrl_info.DLL_header,
eg->ctrl_info.DH_length);
new_skb->protocol = eth_type_trans(new_skb, dev);
skb_reset_network_header(new_skb);
eg->latest_ip_addr = ip_hdr(new_skb)->saddr;
eg->packets_rcvd++;
mpc->eg_ops->put(eg);
memset(ATM_SKB(new_skb), 0, sizeof(struct atm_skb_data));
netif_rx(new_skb);
}
static const struct atmdev_ops mpc_ops = { /* only send is required */
.close = mpoad_close,
.send = msg_from_mpoad
};
static struct atm_dev mpc_dev = {
.ops = &mpc_ops,
.type = "mpc",
.number = 42,
.lock = __SPIN_LOCK_UNLOCKED(mpc_dev.lock)
/* members not explicitly initialised will be 0 */
};
static int atm_mpoa_mpoad_attach(struct atm_vcc *vcc, int arg)
{
struct mpoa_client *mpc;
struct lec_priv *priv;
int err;
if (mpcs == NULL) {
mpc_timer_refresh();
/* This lets us now how our LECs are doing */
err = register_netdevice_notifier(&mpoa_notifier);
if (err < 0) {
del_timer(&mpc_timer);
return err;
}
}
mpc = find_mpc_by_itfnum(arg);
if (mpc == NULL) {
dprintk("allocating new mpc for itf %d\n", arg);
mpc = alloc_mpc();
if (mpc == NULL)
return -ENOMEM;
mpc->dev_num = arg;
mpc->dev = find_lec_by_itfnum(arg);
/* NULL if there was no lec */
}
if (mpc->mpoad_vcc) {
pr_info("mpoad is already present for itf %d\n", arg);
return -EADDRINUSE;
}
if (mpc->dev) { /* check if the lec is LANE2 capable */
priv = netdev_priv(mpc->dev);
if (priv->lane_version < 2) {
dev_put(mpc->dev);
mpc->dev = NULL;
} else
priv->lane2_ops->associate_indicator = lane2_assoc_ind;
}
mpc->mpoad_vcc = vcc;
vcc->dev = &mpc_dev;
vcc_insert_socket(sk_atm(vcc));
set_bit(ATM_VF_META, &vcc->flags);
set_bit(ATM_VF_READY, &vcc->flags);
if (mpc->dev) {
char empty[ATM_ESA_LEN];
memset(empty, 0, ATM_ESA_LEN);
start_mpc(mpc, mpc->dev);
/* set address if mpcd e.g. gets killed and restarted.
* If we do not do it now we have to wait for the next LE_ARP
*/
if (memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0)
send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc);
}
__module_get(THIS_MODULE);
return arg;
}
static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc)
{
struct k_message mesg;
memcpy(mpc->mps_ctrl_addr, addr, ATM_ESA_LEN);
mesg.type = SET_MPS_CTRL_ADDR;
memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN);
msg_to_mpoad(&mesg, mpc);
}
static void mpoad_close(struct atm_vcc *vcc)
{
struct mpoa_client *mpc;
struct sk_buff *skb;
mpc = find_mpc_by_vcc(vcc);
if (mpc == NULL) {
pr_info("did not find MPC\n");
return;
}
if (!mpc->mpoad_vcc) {
pr_info("close for non-present mpoad\n");
return;
}
mpc->mpoad_vcc = NULL;
if (mpc->dev) {
struct lec_priv *priv = netdev_priv(mpc->dev);
priv->lane2_ops->associate_indicator = NULL;
stop_mpc(mpc);
dev_put(mpc->dev);
}
mpc->in_ops->destroy_cache(mpc);
mpc->eg_ops->destroy_cache(mpc);
while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
atm_return(vcc, skb->truesize);
kfree_skb(skb);
}
pr_info("(%s) going down\n",
(mpc->dev) ? mpc->dev->name : "<unknown>");
module_put(THIS_MODULE);
}
/*
*
*/
static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb)
{
struct mpoa_client *mpc = find_mpc_by_vcc(vcc);
struct k_message *mesg = (struct k_message *)skb->data;
WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
if (mpc == NULL) {
pr_info("no mpc found\n");
return 0;
}
dprintk("(%s)", mpc->dev ? mpc->dev->name : "<unknown>");
switch (mesg->type) {
case MPOA_RES_REPLY_RCVD:
dprintk_cont("mpoa_res_reply_rcvd\n");
MPOA_res_reply_rcvd(mesg, mpc);
break;
case MPOA_TRIGGER_RCVD:
dprintk_cont("mpoa_trigger_rcvd\n");
MPOA_trigger_rcvd(mesg, mpc);
break;
case INGRESS_PURGE_RCVD:
dprintk_cont("nhrp_purge_rcvd\n");
ingress_purge_rcvd(mesg, mpc);
break;
case EGRESS_PURGE_RCVD:
dprintk_cont("egress_purge_reply_rcvd\n");
egress_purge_rcvd(mesg, mpc);
break;
case MPS_DEATH:
dprintk_cont("mps_death\n");
mps_death(mesg, mpc);
break;
case CACHE_IMPOS_RCVD:
dprintk_cont("cache_impos_rcvd\n");
MPOA_cache_impos_rcvd(mesg, mpc);
break;
case SET_MPC_CTRL_ADDR:
dprintk_cont("set_mpc_ctrl_addr\n");
set_mpc_ctrl_addr_rcvd(mesg, mpc);
break;
case SET_MPS_MAC_ADDR:
dprintk_cont("set_mps_mac_addr\n");
set_mps_mac_addr_rcvd(mesg, mpc);
break;
case CLEAN_UP_AND_EXIT:
dprintk_cont("clean_up_and_exit\n");
clean_up(mesg, mpc, DIE);
break;
case RELOAD:
dprintk_cont("reload\n");
clean_up(mesg, mpc, RELOAD);
break;
case SET_MPC_PARAMS:
dprintk_cont("set_mpc_params\n");
mpc->parameters = mesg->content.params;
break;
default:
dprintk_cont("unknown message %d\n", mesg->type);
break;
}
kfree_skb(skb);
return 0;
}
/* Remember that this function may not do things that sleep */
int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc)
{
struct sk_buff *skb;
struct sock *sk;
if (mpc == NULL || !mpc->mpoad_vcc) {
pr_info("mesg %d to a non-existent mpoad\n", mesg->type);
return -ENXIO;
}
skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
if (skb == NULL)
return -ENOMEM;
skb_put(skb, sizeof(struct k_message));
skb_copy_to_linear_data(skb, mesg, sizeof(*mesg));
atm_force_charge(mpc->mpoad_vcc, skb->truesize);
sk = sk_atm(mpc->mpoad_vcc);
skb_queue_tail(&sk->sk_receive_queue, skb);
sk->sk_data_ready(sk);
return 0;
}
static int mpoa_event_listener(struct notifier_block *mpoa_notifier,
unsigned long event, void *ptr)