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Merge commit '900cfa46191a7d87cf1891924cb90499287fd235'; branches 'timers/nohz',...
[mirror_ubuntu-artful-kernel.git] / drivers / net / wan / hdlc_fr.c
CommitLineData
1da177e4
LT		 1/*
2 * Generic HDLC support routines for Linux
3 * Frame Relay support
4 *
eb2a2fd9 5 * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
1da177e4
LT		 6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of version 2 of the GNU General Public License
9 * as published by the Free Software Foundation.
10 *
11
12 Theory of PVC state
13
14 DCE mode:
15
16 (exist,new) -> 0,0 when "PVC create" or if "link unreliable"
17 0,x -> 1,1 if "link reliable" when sending FULL STATUS
18 1,1 -> 1,0 if received FULL STATUS ACK
19
20 (active) -> 0 when "ifconfig PVC down" or "link unreliable" or "PVC create"
21 -> 1 when "PVC up" and (exist,new) = 1,0
22
23 DTE mode:
24 (exist,new,active) = FULL STATUS if "link reliable"
25 = 0, 0, 0 if "link unreliable"
26 No LMI:
27 active = open and "link reliable"
28 exist = new = not used
29
b3dd65f9
KH		 30 CCITT LMI: ITU-T Q.933 Annex A
31 ANSI LMI: ANSI T1.617 Annex D
32 CISCO LMI: the original, aka "Gang of Four" LMI
33
1da177e4
LT		 34*/
35
36#include <linux/module.h>
37#include <linux/kernel.h>
38#include <linux/slab.h>
39#include <linux/poll.h>
40#include <linux/errno.h>
41#include <linux/if_arp.h>
42#include <linux/init.h>
43#include <linux/skbuff.h>
44#include <linux/pkt_sched.h>
1da177e4
LT		 45#include <linux/inetdevice.h>
46#include <linux/lapb.h>
47#include <linux/rtnetlink.h>
48#include <linux/etherdevice.h>
49#include <linux/hdlc.h>
50
51#undef DEBUG_PKT
52#undef DEBUG_ECN
53#undef DEBUG_LINK
eb2a2fd9
KH		 54#undef DEBUG_PROTO
55#undef DEBUG_PVC
1da177e4 56
b3dd65f9
KH		 57#define FR_UI 0x03
58#define FR_PAD 0x00
59
60#define NLPID_IP 0xCC
61#define NLPID_IPV6 0x8E
62#define NLPID_SNAP 0x80
63#define NLPID_PAD 0x00
64#define NLPID_CCITT_ANSI_LMI 0x08
65#define NLPID_CISCO_LMI 0x09
66
67
68#define LMI_CCITT_ANSI_DLCI 0 /* LMI DLCI */
69#define LMI_CISCO_DLCI 1023
70
71#define LMI_CALLREF 0x00 /* Call Reference */
72#define LMI_ANSI_LOCKSHIFT 0x95 /* ANSI locking shift */
73#define LMI_ANSI_CISCO_REPTYPE 0x01 /* report type */
74#define LMI_CCITT_REPTYPE 0x51
75#define LMI_ANSI_CISCO_ALIVE 0x03 /* keep alive */
76#define LMI_CCITT_ALIVE 0x53
77#define LMI_ANSI_CISCO_PVCSTAT 0x07 /* PVC status */
78#define LMI_CCITT_PVCSTAT 0x57
79
80#define LMI_FULLREP 0x00 /* full report */
81#define LMI_INTEGRITY 0x01 /* link integrity report */
82#define LMI_SINGLE 0x02 /* single PVC report */
83
1da177e4
LT		 84#define LMI_STATUS_ENQUIRY 0x75
85#define LMI_STATUS 0x7D /* reply */
86
87#define LMI_REPT_LEN 1 /* report type element length */
88#define LMI_INTEG_LEN 2 /* link integrity element length */
89
b3dd65f9
KH		 90#define LMI_CCITT_CISCO_LENGTH 13 /* LMI frame lengths */
91#define LMI_ANSI_LENGTH 14
1da177e4
LT		 92
93
94typedef struct {
95#if defined(__LITTLE_ENDIAN_BITFIELD)
96 unsigned ea1: 1;
97 unsigned cr: 1;
98 unsigned dlcih: 6;
99
100 unsigned ea2: 1;
101 unsigned de: 1;
102 unsigned becn: 1;
103 unsigned fecn: 1;
104 unsigned dlcil: 4;
105#else
106 unsigned dlcih: 6;
107 unsigned cr: 1;
108 unsigned ea1: 1;
109
110 unsigned dlcil: 4;
111 unsigned fecn: 1;
112 unsigned becn: 1;
113 unsigned de: 1;
114 unsigned ea2: 1;
115#endif
116}__attribute__ ((packed)) fr_hdr;
117
118
eb2a2fd9
KH		 119typedef struct pvc_device_struct {
120 struct net_device *frad;
121 struct net_device *main;
122 struct net_device *ether; /* bridged Ethernet interface */
123 struct pvc_device_struct *next; /* Sorted in ascending DLCI order */
124 int dlci;
125 int open_count;
126
127 struct {
128 unsigned int new: 1;
129 unsigned int active: 1;
130 unsigned int exist: 1;
131 unsigned int deleted: 1;
132 unsigned int fecn: 1;
133 unsigned int becn: 1;
134 unsigned int bandwidth; /* Cisco LMI reporting only */
135 }state;
136}pvc_device;
137
983e2304
KH		 138struct pvc_desc {
139 struct net_device_stats stats;
140 pvc_device *pvc;
141};
eb2a2fd9
KH		 142
143struct frad_state {
144 fr_proto settings;
145 pvc_device *first_pvc;
146 int dce_pvc_count;
147
148 struct timer_list timer;
149 unsigned long last_poll;
150 int reliable;
151 int dce_changed;
152 int request;
153 int fullrep_sent;
154 u32 last_errors; /* last errors bit list */
155 u8 n391cnt;
156 u8 txseq; /* TX sequence number */
157 u8 rxseq; /* RX sequence number */
158};
159
160
161static int fr_ioctl(struct net_device *dev, struct ifreq *ifr);
162
163
1da177e4
LT		 164static inline u16 q922_to_dlci(u8 *hdr)
165{
166 return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
167}
168
169
1da177e4
LT		 170static inline void dlci_to_q922(u8 *hdr, u16 dlci)
171{
172 hdr[0] = (dlci >> 2) & 0xFC;
173 hdr[1] = ((dlci << 4) & 0xF0) | 0x01;
174}
175
176
983e2304 177static inline struct frad_state* state(hdlc_device *hdlc)
eb2a2fd9
KH		 178{
179 return(struct frad_state *)(hdlc->state);
180}
181
983e2304 182static inline struct pvc_desc* pvcdev_to_desc(struct net_device *dev)
eb2a2fd9
KH		 183{
184 return dev->priv;
185}
186
983e2304
KH		 187static inline struct net_device_stats* pvc_get_stats(struct net_device *dev)
188{
189 return &pvcdev_to_desc(dev)->stats;
190}
1da177e4
LT		 191
192static inline pvc_device* find_pvc(hdlc_device *hdlc, u16 dlci)
193{
eb2a2fd9 194 pvc_device *pvc = state(hdlc)->first_pvc;
1da177e4
LT		 195
196 while (pvc) {
197 if (pvc->dlci == dlci)
198 return pvc;
199 if (pvc->dlci > dlci)
200 return NULL; /* the listed is sorted */
201 pvc = pvc->next;
202 }
203
204 return NULL;
205}
206
207
eb2a2fd9 208static pvc_device* add_pvc(struct net_device *dev, u16 dlci)
1da177e4
LT		 209{
210 hdlc_device *hdlc = dev_to_hdlc(dev);
eb2a2fd9 211 pvc_device *pvc, **pvc_p = &state(hdlc)->first_pvc;
1da177e4
LT		 212
213 while (*pvc_p) {
214 if ((*pvc_p)->dlci == dlci)
215 return *pvc_p;
216 if ((*pvc_p)->dlci > dlci)
217 break; /* the list is sorted */
218 pvc_p = &(*pvc_p)->next;
219 }
220
1ee32543 221 pvc = kzalloc(sizeof(pvc_device), GFP_ATOMIC);
eb2a2fd9
KH		 222#ifdef DEBUG_PVC
223 printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev);
224#endif
1da177e4
LT		 225 if (!pvc)
226 return NULL;
227
1da177e4 228 pvc->dlci = dlci;
eb2a2fd9 229 pvc->frad = dev;
1da177e4
LT		 230 pvc->next = *pvc_p; /* Put it in the chain */
231 *pvc_p = pvc;
232 return pvc;
233}
234
235
236static inline int pvc_is_used(pvc_device *pvc)
237{
eb2a2fd9 238 return pvc->main || pvc->ether;
1da177e4
LT		 239}
240
241
242static inline void pvc_carrier(int on, pvc_device *pvc)
243{
244 if (on) {
245 if (pvc->main)
246 if (!netif_carrier_ok(pvc->main))
247 netif_carrier_on(pvc->main);
248 if (pvc->ether)
249 if (!netif_carrier_ok(pvc->ether))
250 netif_carrier_on(pvc->ether);
251 } else {
252 if (pvc->main)
253 if (netif_carrier_ok(pvc->main))
254 netif_carrier_off(pvc->main);
255 if (pvc->ether)
256 if (netif_carrier_ok(pvc->ether))
257 netif_carrier_off(pvc->ether);
258 }
259}
260
261
262static inline void delete_unused_pvcs(hdlc_device *hdlc)
263{
eb2a2fd9 264 pvc_device **pvc_p = &state(hdlc)->first_pvc;
1da177e4
LT		 265
266 while (*pvc_p) {
267 if (!pvc_is_used(*pvc_p)) {
268 pvc_device *pvc = *pvc_p;
eb2a2fd9
KH		 269#ifdef DEBUG_PVC
270 printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc);
271#endif
1da177e4
LT		 272 *pvc_p = pvc->next;
273 kfree(pvc);
274 continue;
275 }
276 pvc_p = &(*pvc_p)->next;
277 }
278}
279
280
281static inline struct net_device** get_dev_p(pvc_device *pvc, int type)
282{
283 if (type == ARPHRD_ETHER)
284 return &pvc->ether;
285 else
286 return &pvc->main;
287}
288
289
1da177e4
LT		 290static int fr_hard_header(struct sk_buff **skb_p, u16 dlci)
291{
292 u16 head_len;
293 struct sk_buff *skb = *skb_p;
294
295 switch (skb->protocol) {
abf17ffd 296 case __constant_htons(NLPID_CCITT_ANSI_LMI):
1da177e4
LT		 297 head_len = 4;
298 skb_push(skb, head_len);
b3dd65f9 299 skb->data[3] = NLPID_CCITT_ANSI_LMI;
1da177e4
LT		 300 break;
301
abf17ffd 302 case __constant_htons(NLPID_CISCO_LMI):
1da177e4
LT		 303 head_len = 4;
304 skb_push(skb, head_len);
b3dd65f9 305 skb->data[3] = NLPID_CISCO_LMI;
1da177e4
LT		 306 break;
307
abf17ffd 308 case __constant_htons(ETH_P_IP):
b3dd65f9
KH		 309 head_len = 4;
310 skb_push(skb, head_len);
311 skb->data[3] = NLPID_IP;
312 break;
313
abf17ffd 314 case __constant_htons(ETH_P_IPV6):
1da177e4
LT		 315 head_len = 4;
316 skb_push(skb, head_len);
b3dd65f9 317 skb->data[3] = NLPID_IPV6;
1da177e4
LT		 318 break;
319
abf17ffd 320 case __constant_htons(ETH_P_802_3):
1da177e4
LT		 321 head_len = 10;
322 if (skb_headroom(skb) < head_len) {
323 struct sk_buff *skb2 = skb_realloc_headroom(skb,
324 head_len);
325 if (!skb2)
326 return -ENOBUFS;
327 dev_kfree_skb(skb);
328 skb = *skb_p = skb2;
329 }
330 skb_push(skb, head_len);
331 skb->data[3] = FR_PAD;
332 skb->data[4] = NLPID_SNAP;
333 skb->data[5] = FR_PAD;
334 skb->data[6] = 0x80;
335 skb->data[7] = 0xC2;
336 skb->data[8] = 0x00;
337 skb->data[9] = 0x07; /* bridged Ethernet frame w/out FCS */
338 break;
339
340 default:
341 head_len = 10;
342 skb_push(skb, head_len);
343 skb->data[3] = FR_PAD;
344 skb->data[4] = NLPID_SNAP;
345 skb->data[5] = FR_PAD;
346 skb->data[6] = FR_PAD;
347 skb->data[7] = FR_PAD;
abf17ffd 348 *(__be16*)(skb->data + 8) = skb->protocol;
1da177e4
LT		 349 }
350
351 dlci_to_q922(skb->data, dlci);
352 skb->data[2] = FR_UI;
353 return 0;
354}
355
356
357
358static int pvc_open(struct net_device *dev)
359{
983e2304 360 pvc_device *pvc = pvcdev_to_desc(dev)->pvc;
1da177e4 361
eb2a2fd9
KH		 362 if ((pvc->frad->flags & IFF_UP) == 0)
363 return -EIO; /* Frad must be UP in order to activate PVC */
1da177e4
LT		 364
365 if (pvc->open_count++ == 0) {
eb2a2fd9
KH		 366 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
367 if (state(hdlc)->settings.lmi == LMI_NONE)
368 pvc->state.active = netif_carrier_ok(pvc->frad);
1da177e4
LT		 369
370 pvc_carrier(pvc->state.active, pvc);
eb2a2fd9 371 state(hdlc)->dce_changed = 1;
1da177e4
LT		 372 }
373 return 0;
374}
375
376
377
378static int pvc_close(struct net_device *dev)
379{
983e2304 380 pvc_device *pvc = pvcdev_to_desc(dev)->pvc;
1da177e4
LT		 381
382 if (--pvc->open_count == 0) {
eb2a2fd9
KH		 383 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
384 if (state(hdlc)->settings.lmi == LMI_NONE)
1da177e4
LT		 385 pvc->state.active = 0;
386
eb2a2fd9
KH		 387 if (state(hdlc)->settings.dce) {
388 state(hdlc)->dce_changed = 1;
1da177e4
LT		 389 pvc->state.active = 0;
390 }
391 }
392 return 0;
393}
394
395
396
7665a089 397static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1da177e4 398{
983e2304 399 pvc_device *pvc = pvcdev_to_desc(dev)->pvc;
1da177e4
LT		 400 fr_proto_pvc_info info;
401
402 if (ifr->ifr_settings.type == IF_GET_PROTO) {
403 if (dev->type == ARPHRD_ETHER)
404 ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
405 else
406 ifr->ifr_settings.type = IF_PROTO_FR_PVC;
407
408 if (ifr->ifr_settings.size < sizeof(info)) {
409 /* data size wanted */
410 ifr->ifr_settings.size = sizeof(info);
411 return -ENOBUFS;
412 }
413
414 info.dlci = pvc->dlci;
eb2a2fd9 415 memcpy(info.master, pvc->frad->name, IFNAMSIZ);
1da177e4
LT		 416 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
417 &info, sizeof(info)))
418 return -EFAULT;
419 return 0;
420 }
421
422 return -EINVAL;
423}
424
1da177e4
LT		 425static int pvc_xmit(struct sk_buff *skb, struct net_device *dev)
426{
983e2304 427 pvc_device *pvc = pvcdev_to_desc(dev)->pvc;
1da177e4
LT		 428 struct net_device_stats *stats = pvc_get_stats(dev);
429
430 if (pvc->state.active) {
431 if (dev->type == ARPHRD_ETHER) {
432 int pad = ETH_ZLEN - skb->len;
433 if (pad > 0) { /* Pad the frame with zeros */
434 int len = skb->len;
435 if (skb_tailroom(skb) < pad)
436 if (pskb_expand_head(skb, 0, pad,
437 GFP_ATOMIC)) {
438 stats->tx_dropped++;
439 dev_kfree_skb(skb);
440 return 0;
441 }
442 skb_put(skb, pad);
443 memset(skb->data + len, 0, pad);
444 }
445 skb->protocol = __constant_htons(ETH_P_802_3);
446 }
447 if (!fr_hard_header(&skb, pvc->dlci)) {
448 stats->tx_bytes += skb->len;
449 stats->tx_packets++;
450 if (pvc->state.fecn) /* TX Congestion counter */
451 stats->tx_compressed++;
eb2a2fd9 452 skb->dev = pvc->frad;
1da177e4
LT		 453 dev_queue_xmit(skb);
454 return 0;
455 }
456 }
457
458 stats->tx_dropped++;
459 dev_kfree_skb(skb);
460 return 0;
461}
462
463
464
465static int pvc_change_mtu(struct net_device *dev, int new_mtu)
466{
467 if ((new_mtu < 68) || (new_mtu > HDLC_MAX_MTU))
468 return -EINVAL;
469 dev->mtu = new_mtu;
470 return 0;
471}
472
473
474
475static inline void fr_log_dlci_active(pvc_device *pvc)
476{
477 printk(KERN_INFO "%s: DLCI %d [%s%s%s]%s %s\n",
eb2a2fd9 478 pvc->frad->name,
1da177e4
LT		 479 pvc->dlci,
480 pvc->main ? pvc->main->name : "",
481 pvc->main && pvc->ether ? " " : "",
482 pvc->ether ? pvc->ether->name : "",
483 pvc->state.new ? " new" : "",
484 !pvc->state.exist ? "deleted" :
485 pvc->state.active ? "active" : "inactive");
486}
487
488
489
490static inline u8 fr_lmi_nextseq(u8 x)
491{
492 x++;
493 return x ? x : 1;
494}
495
496
1da177e4
LT		 497static void fr_lmi_send(struct net_device *dev, int fullrep)
498{
499 hdlc_device *hdlc = dev_to_hdlc(dev);
500 struct sk_buff *skb;
eb2a2fd9
KH		 501 pvc_device *pvc = state(hdlc)->first_pvc;
502 int lmi = state(hdlc)->settings.lmi;
503 int dce = state(hdlc)->settings.dce;
b3dd65f9
KH		 504 int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
505 int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
1da177e4
LT		 506 u8 *data;
507 int i = 0;
508
b3dd65f9 509 if (dce && fullrep) {
eb2a2fd9 510 len += state(hdlc)->dce_pvc_count * (2 + stat_len);
1da177e4
LT		 511 if (len > HDLC_MAX_MRU) {
512 printk(KERN_WARNING "%s: Too many PVCs while sending "
513 "LMI full report\n", dev->name);
514 return;
515 }
516 }
517
518 skb = dev_alloc_skb(len);
519 if (!skb) {
520 printk(KERN_WARNING "%s: Memory squeeze on fr_lmi_send()\n",
521 dev->name);
522 return;
523 }
524 memset(skb->data, 0, len);
525 skb_reserve(skb, 4);
b3dd65f9
KH		 526 if (lmi == LMI_CISCO) {
527 skb->protocol = __constant_htons(NLPID_CISCO_LMI);
528 fr_hard_header(&skb, LMI_CISCO_DLCI);
529 } else {
530 skb->protocol = __constant_htons(NLPID_CCITT_ANSI_LMI);
531 fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI);
532 }
27a884dc 533 data = skb_tail_pointer(skb);
1da177e4 534 data[i++] = LMI_CALLREF;
b3dd65f9
KH		 535 data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
536 if (lmi == LMI_ANSI)
1da177e4 537 data[i++] = LMI_ANSI_LOCKSHIFT;
b3dd65f9
KH		 538 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
539 LMI_ANSI_CISCO_REPTYPE;
1da177e4
LT		 540 data[i++] = LMI_REPT_LEN;
541 data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
b3dd65f9 542 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
1da177e4 543 data[i++] = LMI_INTEG_LEN;
eb2a2fd9
KH		 544 data[i++] = state(hdlc)->txseq =
545 fr_lmi_nextseq(state(hdlc)->txseq);
546 data[i++] = state(hdlc)->rxseq;
1da177e4 547
b3dd65f9 548 if (dce && fullrep) {
1da177e4 549 while (pvc) {
b3dd65f9
KH		 550 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
551 LMI_ANSI_CISCO_PVCSTAT;
1da177e4
LT		 552 data[i++] = stat_len;
553
554 /* LMI start/restart */
eb2a2fd9 555 if (state(hdlc)->reliable && !pvc->state.exist) {
1da177e4
LT		 556 pvc->state.exist = pvc->state.new = 1;
557 fr_log_dlci_active(pvc);
558 }
559
560 /* ifconfig PVC up */
561 if (pvc->open_count && !pvc->state.active &&
562 pvc->state.exist && !pvc->state.new) {
563 pvc_carrier(1, pvc);
564 pvc->state.active = 1;
565 fr_log_dlci_active(pvc);
566 }
567
b3dd65f9
KH		 568 if (lmi == LMI_CISCO) {
569 data[i] = pvc->dlci >> 8;
570 data[i + 1] = pvc->dlci & 0xFF;
571 } else {
572 data[i] = (pvc->dlci >> 4) & 0x3F;
573 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
574 data[i + 2] = 0x80;
575 }
576
577 if (pvc->state.new)
578 data[i + 2] |= 0x08;
579 else if (pvc->state.active)
580 data[i + 2] |= 0x02;
581
1da177e4
LT		 582 i += stat_len;
583 pvc = pvc->next;
584 }
585 }
586
587 skb_put(skb, i);
588 skb->priority = TC_PRIO_CONTROL;
589 skb->dev = dev;
c1d2bbe1 590 skb_reset_network_header(skb);
1da177e4
LT		 591
592 dev_queue_xmit(skb);
593}
594
595
596
597static void fr_set_link_state(int reliable, struct net_device *dev)
598{
599 hdlc_device *hdlc = dev_to_hdlc(dev);
eb2a2fd9 600 pvc_device *pvc = state(hdlc)->first_pvc;
1da177e4 601
eb2a2fd9 602 state(hdlc)->reliable = reliable;
1da177e4 603 if (reliable) {
c2ce9204 604 netif_dormant_off(dev);
eb2a2fd9
KH		 605 state(hdlc)->n391cnt = 0; /* Request full status */
606 state(hdlc)->dce_changed = 1;
1da177e4 607
eb2a2fd9 608 if (state(hdlc)->settings.lmi == LMI_NONE) {
1da177e4
LT		 609 while (pvc) { /* Activate all PVCs */
610 pvc_carrier(1, pvc);
611 pvc->state.exist = pvc->state.active = 1;
612 pvc->state.new = 0;
613 pvc = pvc->next;
614 }
615 }
616 } else {
c2ce9204 617 netif_dormant_on(dev);
1da177e4
LT		 618 while (pvc) { /* Deactivate all PVCs */
619 pvc_carrier(0, pvc);
620 pvc->state.exist = pvc->state.active = 0;
621 pvc->state.new = 0;
eb2a2fd9 622 if (!state(hdlc)->settings.dce)
b3dd65f9 623 pvc->state.bandwidth = 0;
1da177e4
LT		 624 pvc = pvc->next;
625 }
626 }
627}
628
629
1da177e4
LT		 630static void fr_timer(unsigned long arg)
631{
632 struct net_device *dev = (struct net_device *)arg;
633 hdlc_device *hdlc = dev_to_hdlc(dev);
634 int i, cnt = 0, reliable;
635 u32 list;
636
eb2a2fd9
KH		 637 if (state(hdlc)->settings.dce) {
638 reliable = state(hdlc)->request &&
639 time_before(jiffies, state(hdlc)->last_poll +
640 state(hdlc)->settings.t392 * HZ);
641 state(hdlc)->request = 0;
b3dd65f9 642 } else {
eb2a2fd9
KH		 643 state(hdlc)->last_errors <<= 1; /* Shift the list */
644 if (state(hdlc)->request) {
645 if (state(hdlc)->reliable)
1da177e4
LT		 646 printk(KERN_INFO "%s: No LMI status reply "
647 "received\n", dev->name);
eb2a2fd9 648 state(hdlc)->last_errors |= 1;
1da177e4
LT		 649 }
650
eb2a2fd9
KH		 651 list = state(hdlc)->last_errors;
652 for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1)
1da177e4
LT		 653 cnt += (list & 1); /* errors count */
654
eb2a2fd9 655 reliable = (cnt < state(hdlc)->settings.n392);
1da177e4
LT		 656 }
657
eb2a2fd9 658 if (state(hdlc)->reliable != reliable) {
1da177e4
LT		 659 printk(KERN_INFO "%s: Link %sreliable\n", dev->name,
660 reliable ? "" : "un");
661 fr_set_link_state(reliable, dev);
662 }
663
eb2a2fd9
KH		 664 if (state(hdlc)->settings.dce)
665 state(hdlc)->timer.expires = jiffies +
666 state(hdlc)->settings.t392 * HZ;
1da177e4 667 else {
eb2a2fd9
KH		 668 if (state(hdlc)->n391cnt)
669 state(hdlc)->n391cnt--;
1da177e4 670
eb2a2fd9 671 fr_lmi_send(dev, state(hdlc)->n391cnt == 0);
1da177e4 672
eb2a2fd9
KH		 673 state(hdlc)->last_poll = jiffies;
674 state(hdlc)->request = 1;
675 state(hdlc)->timer.expires = jiffies +
676 state(hdlc)->settings.t391 * HZ;
1da177e4
LT		 677 }
678
eb2a2fd9
KH		 679 state(hdlc)->timer.function = fr_timer;
680 state(hdlc)->timer.data = arg;
681 add_timer(&state(hdlc)->timer);
1da177e4
LT		 682}
683
684
1da177e4
LT		 685static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
686{
687 hdlc_device *hdlc = dev_to_hdlc(dev);
1da177e4 688 pvc_device *pvc;
1da177e4 689 u8 rxseq, txseq;
eb2a2fd9
KH		 690 int lmi = state(hdlc)->settings.lmi;
691 int dce = state(hdlc)->settings.dce;
b3dd65f9 692 int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;
1da177e4 693
b3dd65f9
KH		 694 if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
695 LMI_CCITT_CISCO_LENGTH)) {
1da177e4
LT		 696 printk(KERN_INFO "%s: Short LMI frame\n", dev->name);
697 return 1;
698 }
699
b3dd65f9
KH		 700 if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
701 NLPID_CCITT_ANSI_LMI)) {
eb2a2fd9
KH		 702 printk(KERN_INFO "%s: Received non-LMI frame with LMI DLCI\n",
703 dev->name);
b3dd65f9
KH		 704 return 1;
705 }
706
707 if (skb->data[4] != LMI_CALLREF) {
708 printk(KERN_INFO "%s: Invalid LMI Call reference (0x%02X)\n",
709 dev->name, skb->data[4]);
710 return 1;
711 }
712
713 if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
714 printk(KERN_INFO "%s: Invalid LMI Message type (0x%02X)\n",
715 dev->name, skb->data[5]);
1da177e4
LT		 716 return 1;
717 }
718
b3dd65f9
KH		 719 if (lmi == LMI_ANSI) {
720 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
721 printk(KERN_INFO "%s: Not ANSI locking shift in LMI"
722 " message (0x%02X)\n", dev->name, skb->data[6]);
723 return 1;
724 }
725 i = 7;
726 } else
727 i = 6;
1da177e4 728
b3dd65f9
KH		 729 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
730 LMI_ANSI_CISCO_REPTYPE)) {
731 printk(KERN_INFO "%s: Not an LMI Report type IE (0x%02X)\n",
1da177e4
LT		 732 dev->name, skb->data[i]);
733 return 1;
734 }
1da177e4 735
b3dd65f9
KH		 736 if (skb->data[++i] != LMI_REPT_LEN) {
737 printk(KERN_INFO "%s: Invalid LMI Report type IE length"
738 " (%u)\n", dev->name, skb->data[i]);
739 return 1;
740 }
1da177e4 741
b3dd65f9
KH		 742 reptype = skb->data[++i];
743 if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
744 printk(KERN_INFO "%s: Unsupported LMI Report type (0x%02X)\n",
745 dev->name, reptype);
746 return 1;
747 }
1da177e4 748
b3dd65f9
KH		 749 if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
750 LMI_ANSI_CISCO_ALIVE)) {
751 printk(KERN_INFO "%s: Not an LMI Link integrity verification"
752 " IE (0x%02X)\n", dev->name, skb->data[i]);
1da177e4
LT		 753 return 1;
754 }
1da177e4 755
b3dd65f9
KH		 756 if (skb->data[++i] != LMI_INTEG_LEN) {
757 printk(KERN_INFO "%s: Invalid LMI Link integrity verification"
758 " IE length (%u)\n", dev->name, skb->data[i]);
759 return 1;
760 }
761 i++;
1da177e4 762
eb2a2fd9 763 state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */
1da177e4
LT		 764 rxseq = skb->data[i++]; /* Should confirm our sequence */
765
eb2a2fd9 766 txseq = state(hdlc)->txseq;
1da177e4 767
b3dd65f9 768 if (dce)
eb2a2fd9 769 state(hdlc)->last_poll = jiffies;
1da177e4
LT		 770
771 error = 0;
eb2a2fd9 772 if (!state(hdlc)->reliable)
1da177e4
LT		 773 error = 1;
774
eb2a2fd9
KH		 775 if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */
776 state(hdlc)->n391cnt = 0;
1da177e4
LT		 777 error = 1;
778 }
779
b3dd65f9 780 if (dce) {
eb2a2fd9 781 if (state(hdlc)->fullrep_sent && !error) {
1da177e4 782/* Stop sending full report - the last one has been confirmed by DTE */
eb2a2fd9
KH		 783 state(hdlc)->fullrep_sent = 0;
784 pvc = state(hdlc)->first_pvc;
1da177e4
LT		 785 while (pvc) {
786 if (pvc->state.new) {
787 pvc->state.new = 0;
788
789/* Tell DTE that new PVC is now active */
eb2a2fd9 790 state(hdlc)->dce_changed = 1;
1da177e4
LT		 791 }
792 pvc = pvc->next;
793 }
794 }
795
eb2a2fd9 796 if (state(hdlc)->dce_changed) {
1da177e4 797 reptype = LMI_FULLREP;
eb2a2fd9
KH		 798 state(hdlc)->fullrep_sent = 1;
799 state(hdlc)->dce_changed = 0;
1da177e4
LT		 800 }
801
eb2a2fd9 802 state(hdlc)->request = 1; /* got request */
1da177e4
LT		 803 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
804 return 0;
805 }
806
807 /* DTE */
808
eb2a2fd9 809 state(hdlc)->request = 0; /* got response, no request pending */
1da177e4
LT		 810
811 if (error)
812 return 0;
813
814 if (reptype != LMI_FULLREP)
815 return 0;
816
eb2a2fd9 817 pvc = state(hdlc)->first_pvc;
1da177e4
LT		 818
819 while (pvc) {
820 pvc->state.deleted = 1;
821 pvc = pvc->next;
822 }
823
824 no_ram = 0;
825 while (skb->len >= i + 2 + stat_len) {
826 u16 dlci;
b3dd65f9 827 u32 bw;
1da177e4
LT		 828 unsigned int active, new;
829
b3dd65f9
KH		 830 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
831 LMI_ANSI_CISCO_PVCSTAT)) {
832 printk(KERN_INFO "%s: Not an LMI PVC status IE"
833 " (0x%02X)\n", dev->name, skb->data[i]);
1da177e4
LT		 834 return 1;
835 }
1da177e4 836
b3dd65f9
KH		 837 if (skb->data[++i] != stat_len) {
838 printk(KERN_INFO "%s: Invalid LMI PVC status IE length"
839 " (%u)\n", dev->name, skb->data[i]);
1da177e4
LT		 840 return 1;
841 }
842 i++;
843
b3dd65f9
KH		 844 new = !! (skb->data[i + 2] & 0x08);
845 active = !! (skb->data[i + 2] & 0x02);
846 if (lmi == LMI_CISCO) {
847 dlci = (skb->data[i] << 8) | skb->data[i + 1];
848 bw = (skb->data[i + 3] << 16) |
849 (skb->data[i + 4] << 8) |
850 (skb->data[i + 5]);
851 } else {
852 dlci = ((skb->data[i] & 0x3F) << 4) |
853 ((skb->data[i + 1] & 0x78) >> 3);
854 bw = 0;
855 }
1da177e4
LT		 856
857 pvc = add_pvc(dev, dlci);
858
859 if (!pvc && !no_ram) {
860 printk(KERN_WARNING
861 "%s: Memory squeeze on fr_lmi_recv()\n",
862 dev->name);
863 no_ram = 1;
864 }
865
866 if (pvc) {
867 pvc->state.exist = 1;
868 pvc->state.deleted = 0;
869 if (active != pvc->state.active ||
870 new != pvc->state.new ||
b3dd65f9 871 bw != pvc->state.bandwidth ||
1da177e4
LT		 872 !pvc->state.exist) {
873 pvc->state.new = new;
874 pvc->state.active = active;
b3dd65f9 875 pvc->state.bandwidth = bw;
1da177e4
LT		 876 pvc_carrier(active, pvc);
877 fr_log_dlci_active(pvc);
878 }
879 }
880
881 i += stat_len;
882 }
883
eb2a2fd9 884 pvc = state(hdlc)->first_pvc;
1da177e4
LT		 885
886 while (pvc) {
887 if (pvc->state.deleted && pvc->state.exist) {
888 pvc_carrier(0, pvc);
889 pvc->state.active = pvc->state.new = 0;
890 pvc->state.exist = 0;
b3dd65f9 891 pvc->state.bandwidth = 0;
1da177e4
LT		 892 fr_log_dlci_active(pvc);
893 }
894 pvc = pvc->next;
895 }
896
897 /* Next full report after N391 polls */
eb2a2fd9 898 state(hdlc)->n391cnt = state(hdlc)->settings.n391;
1da177e4
LT		 899
900 return 0;
901}
902
903
1da177e4
LT		 904static int fr_rx(struct sk_buff *skb)
905{
eb2a2fd9
KH		 906 struct net_device *frad = skb->dev;
907 hdlc_device *hdlc = dev_to_hdlc(frad);
1da177e4
LT		 908 fr_hdr *fh = (fr_hdr*)skb->data;
909 u8 *data = skb->data;
910 u16 dlci;
911 pvc_device *pvc;
912 struct net_device *dev = NULL;
913
914 if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
915 goto rx_error;
916
917 dlci = q922_to_dlci(skb->data);
918
b3dd65f9 919 if ((dlci == LMI_CCITT_ANSI_DLCI &&
eb2a2fd9
KH		 920 (state(hdlc)->settings.lmi == LMI_ANSI ||
921 state(hdlc)->settings.lmi == LMI_CCITT)) ||
b3dd65f9 922 (dlci == LMI_CISCO_DLCI &&
eb2a2fd9
KH		 923 state(hdlc)->settings.lmi == LMI_CISCO)) {
924 if (fr_lmi_recv(frad, skb))
b3dd65f9
KH		 925 goto rx_error;
926 dev_kfree_skb_any(skb);
927 return NET_RX_SUCCESS;
1da177e4
LT		 928 }
929
930 pvc = find_pvc(hdlc, dlci);
931 if (!pvc) {
932#ifdef DEBUG_PKT
933 printk(KERN_INFO "%s: No PVC for received frame's DLCI %d\n",
eb2a2fd9 934 frad->name, dlci);
1da177e4
LT		 935#endif
936 dev_kfree_skb_any(skb);
937 return NET_RX_DROP;
938 }
939
940 if (pvc->state.fecn != fh->fecn) {
941#ifdef DEBUG_ECN
eb2a2fd9 942 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name,
1da177e4
LT		 943 dlci, fh->fecn ? "N" : "FF");
944#endif
945 pvc->state.fecn ^= 1;
946 }
947
948 if (pvc->state.becn != fh->becn) {
949#ifdef DEBUG_ECN
eb2a2fd9 950 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name,
1da177e4
LT		 951 dlci, fh->becn ? "N" : "FF");
952#endif
953 pvc->state.becn ^= 1;
954 }
955
956
957 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
40d25142 958 dev_to_hdlc(frad)->stats.rx_dropped++;
1da177e4
LT		 959 return NET_RX_DROP;
960 }
961
962 if (data[3] == NLPID_IP) {
963 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
964 dev = pvc->main;
965 skb->protocol = htons(ETH_P_IP);
966
967 } else if (data[3] == NLPID_IPV6) {
968 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
969 dev = pvc->main;
970 skb->protocol = htons(ETH_P_IPV6);
971
972 } else if (skb->len > 10 && data[3] == FR_PAD &&
973 data[4] == NLPID_SNAP && data[5] == FR_PAD) {
abf17ffd
KH		 974 u16 oui = ntohs(*(__be16*)(data + 6));
975 u16 pid = ntohs(*(__be16*)(data + 8));
1da177e4
LT		 976 skb_pull(skb, 10);
977
978 switch ((((u32)oui) << 16) | pid) {
979 case ETH_P_ARP: /* routed frame with SNAP */
980 case ETH_P_IPX:
981 case ETH_P_IP: /* a long variant */
982 case ETH_P_IPV6:
983 dev = pvc->main;
984 skb->protocol = htons(pid);
985 break;
986
987 case 0x80C20007: /* bridged Ethernet frame */
988 if ((dev = pvc->ether) != NULL)
989 skb->protocol = eth_type_trans(skb, dev);
990 break;
991
992 default:
993 printk(KERN_INFO "%s: Unsupported protocol, OUI=%x "
eb2a2fd9 994 "PID=%x\n", frad->name, oui, pid);
1da177e4
LT		 995 dev_kfree_skb_any(skb);
996 return NET_RX_DROP;
997 }
998 } else {
999 printk(KERN_INFO "%s: Unsupported protocol, NLPID=%x "
eb2a2fd9 1000 "length = %i\n", frad->name, data[3], skb->len);
1da177e4
LT		 1001 dev_kfree_skb_any(skb);
1002 return NET_RX_DROP;
1003 }
1004
1005 if (dev) {
1006 struct net_device_stats *stats = pvc_get_stats(dev);
1007 stats->rx_packets++; /* PVC traffic */
1008 stats->rx_bytes += skb->len;
1009 if (pvc->state.becn)
1010 stats->rx_compressed++;
54364b75 1011 skb->dev = dev;
1da177e4
LT		 1012 netif_rx(skb);
1013 return NET_RX_SUCCESS;
1014 } else {
1015 dev_kfree_skb_any(skb);
1016 return NET_RX_DROP;
1017 }
1018
1019 rx_error:
40d25142 1020 dev_to_hdlc(frad)->stats.rx_errors++; /* Mark error */
1da177e4
LT		 1021 dev_kfree_skb_any(skb);
1022 return NET_RX_DROP;
1023}
1024
1025
1026
1027static void fr_start(struct net_device *dev)
1028{
1029 hdlc_device *hdlc = dev_to_hdlc(dev);
1030#ifdef DEBUG_LINK
1031 printk(KERN_DEBUG "fr_start\n");
1032#endif
eb2a2fd9
KH		 1033 if (state(hdlc)->settings.lmi != LMI_NONE) {
1034 state(hdlc)->reliable = 0;
1035 state(hdlc)->dce_changed = 1;
1036 state(hdlc)->request = 0;
1037 state(hdlc)->fullrep_sent = 0;
1038 state(hdlc)->last_errors = 0xFFFFFFFF;
1039 state(hdlc)->n391cnt = 0;
1040 state(hdlc)->txseq = state(hdlc)->rxseq = 0;
1041
1042 init_timer(&state(hdlc)->timer);
1da177e4 1043 /* First poll after 1 s */
eb2a2fd9
KH		 1044 state(hdlc)->timer.expires = jiffies + HZ;
1045 state(hdlc)->timer.function = fr_timer;
1046 state(hdlc)->timer.data = (unsigned long)dev;
1047 add_timer(&state(hdlc)->timer);
1da177e4
LT		 1048 } else
1049 fr_set_link_state(1, dev);
1050}
1051
1052
1da177e4
LT		 1053static void fr_stop(struct net_device *dev)
1054{
1055 hdlc_device *hdlc = dev_to_hdlc(dev);
1056#ifdef DEBUG_LINK
1057 printk(KERN_DEBUG "fr_stop\n");
1058#endif
eb2a2fd9
KH		 1059 if (state(hdlc)->settings.lmi != LMI_NONE)
1060 del_timer_sync(&state(hdlc)->timer);
1da177e4
LT		 1061 fr_set_link_state(0, dev);
1062}
1063
1064
1da177e4
LT		 1065static void fr_close(struct net_device *dev)
1066{
1067 hdlc_device *hdlc = dev_to_hdlc(dev);
eb2a2fd9 1068 pvc_device *pvc = state(hdlc)->first_pvc;
1da177e4
LT		 1069
1070 while (pvc) { /* Shutdown all PVCs for this FRAD */
1071 if (pvc->main)
1072 dev_close(pvc->main);
1073 if (pvc->ether)
1074 dev_close(pvc->ether);
1075 pvc = pvc->next;
1076 }
1077}
1078
eb2a2fd9
KH		 1079
1080static void pvc_setup(struct net_device *dev)
1da177e4
LT		 1081{
1082 dev->type = ARPHRD_DLCI;
1083 dev->flags = IFF_POINTOPOINT;
1084 dev->hard_header_len = 10;
1085 dev->addr_len = 2;
1086}
1087
eb2a2fd9 1088static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
1da177e4 1089{
eb2a2fd9 1090 hdlc_device *hdlc = dev_to_hdlc(frad);
1da177e4
LT		 1091 pvc_device *pvc = NULL;
1092 struct net_device *dev;
1093 int result, used;
1da177e4 1094
eb2a2fd9 1095 if ((pvc = add_pvc(frad, dlci)) == NULL) {
1da177e4 1096 printk(KERN_WARNING "%s: Memory squeeze on fr_add_pvc()\n",
eb2a2fd9 1097 frad->name);
1da177e4
LT		 1098 return -ENOBUFS;
1099 }
1100
1101 if (*get_dev_p(pvc, type))
1102 return -EEXIST;
1103
1104 used = pvc_is_used(pvc);
1105
1106 if (type == ARPHRD_ETHER)
983e2304
KH		 1107 dev = alloc_netdev(sizeof(struct pvc_desc), "pvceth%d",
1108 ether_setup);
1da177e4 1109 else
983e2304 1110 dev = alloc_netdev(sizeof(struct pvc_desc), "pvc%d", pvc_setup);
1da177e4
LT		 1111
1112 if (!dev) {
1113 printk(KERN_WARNING "%s: Memory squeeze on fr_pvc()\n",
eb2a2fd9 1114 frad->name);
1da177e4
LT		 1115 delete_unused_pvcs(hdlc);
1116 return -ENOBUFS;
1117 }
1118
47eaa267
KH		 1119 if (type == ARPHRD_ETHER)
1120 random_ether_addr(dev->dev_addr);
1121 else {
abf17ffd 1122 *(__be16*)dev->dev_addr = htons(dlci);
1da177e4
LT		 1123 dlci_to_q922(dev->broadcast, dlci);
1124 }
1125 dev->hard_start_xmit = pvc_xmit;
1126 dev->get_stats = pvc_get_stats;
1127 dev->open = pvc_open;
1128 dev->stop = pvc_close;
1129 dev->do_ioctl = pvc_ioctl;
1130 dev->change_mtu = pvc_change_mtu;
1131 dev->mtu = HDLC_MAX_MTU;
1132 dev->tx_queue_len = 0;
983e2304 1133 pvcdev_to_desc(dev)->pvc = pvc;
1da177e4
LT		 1134
1135 result = dev_alloc_name(dev, dev->name);
1136 if (result < 0) {
1137 free_netdev(dev);
1138 delete_unused_pvcs(hdlc);
1139 return result;
1140 }
1141
1142 if (register_netdevice(dev) != 0) {
1143 free_netdev(dev);
1144 delete_unused_pvcs(hdlc);
1145 return -EIO;
1146 }
1147
1148 dev->destructor = free_netdev;
1149 *get_dev_p(pvc, type) = dev;
1150 if (!used) {
eb2a2fd9
KH		 1151 state(hdlc)->dce_changed = 1;
1152 state(hdlc)->dce_pvc_count++;
1da177e4
LT		 1153 }
1154 return 0;
1155}
1156
1157
1158
1159static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
1160{
1161 pvc_device *pvc;
1162 struct net_device *dev;
1163
1164 if ((pvc = find_pvc(hdlc, dlci)) == NULL)
1165 return -ENOENT;
1166
1167 if ((dev = *get_dev_p(pvc, type)) == NULL)
1168 return -ENOENT;
1169
1170 if (dev->flags & IFF_UP)
1171 return -EBUSY; /* PVC in use */
1172
1173 unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
1174 *get_dev_p(pvc, type) = NULL;
1175
1176 if (!pvc_is_used(pvc)) {
eb2a2fd9
KH		 1177 state(hdlc)->dce_pvc_count--;
1178 state(hdlc)->dce_changed = 1;
1da177e4
LT		 1179 }
1180 delete_unused_pvcs(hdlc);
1181 return 0;
1182}
1183
1184
1185
eb2a2fd9 1186static void fr_destroy(struct net_device *frad)
1da177e4 1187{
eb2a2fd9
KH		 1188 hdlc_device *hdlc = dev_to_hdlc(frad);
1189 pvc_device *pvc = state(hdlc)->first_pvc;
1190 state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */
1191 state(hdlc)->dce_pvc_count = 0;
1192 state(hdlc)->dce_changed = 1;
1da177e4
LT		 1193
1194 while (pvc) {
1195 pvc_device *next = pvc->next;
1196 /* destructors will free_netdev() main and ether */
1197 if (pvc->main)
1198 unregister_netdevice(pvc->main);
1199
1200 if (pvc->ether)
1201 unregister_netdevice(pvc->ether);
1202
1203 kfree(pvc);
1204 pvc = next;
1205 }
1206}
1207
1208
eb2a2fd9
KH		 1209static struct hdlc_proto proto = {
1210 .close = fr_close,
1211 .start = fr_start,
1212 .stop = fr_stop,
1213 .detach = fr_destroy,
1214 .ioctl = fr_ioctl,
40d25142 1215 .netif_rx = fr_rx,
eb2a2fd9
KH		 1216 .module = THIS_MODULE,
1217};
1218
1da177e4 1219
eb2a2fd9 1220static int fr_ioctl(struct net_device *dev, struct ifreq *ifr)
1da177e4
LT		 1221{
1222 fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
1223 const size_t size = sizeof(fr_proto);
1224 fr_proto new_settings;
1225 hdlc_device *hdlc = dev_to_hdlc(dev);
1226 fr_proto_pvc pvc;
1227 int result;
1228
1229 switch (ifr->ifr_settings.type) {
1230 case IF_GET_PROTO:
eb2a2fd9
KH		 1231 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1232 return -EINVAL;
1da177e4
LT		 1233 ifr->ifr_settings.type = IF_PROTO_FR;
1234 if (ifr->ifr_settings.size < size) {
1235 ifr->ifr_settings.size = size; /* data size wanted */
1236 return -ENOBUFS;
1237 }
eb2a2fd9 1238 if (copy_to_user(fr_s, &state(hdlc)->settings, size))
1da177e4
LT		 1239 return -EFAULT;
1240 return 0;
1241
1242 case IF_PROTO_FR:
1243 if(!capable(CAP_NET_ADMIN))
1244 return -EPERM;
1245
1246 if(dev->flags & IFF_UP)
1247 return -EBUSY;
1248
1249 if (copy_from_user(&new_settings, fr_s, size))
1250 return -EFAULT;
1251
1252 if (new_settings.lmi == LMI_DEFAULT)
1253 new_settings.lmi = LMI_ANSI;
1254
1255 if ((new_settings.lmi != LMI_NONE &&
1256 new_settings.lmi != LMI_ANSI &&
b3dd65f9
KH		 1257 new_settings.lmi != LMI_CCITT &&
1258 new_settings.lmi != LMI_CISCO) ||
1da177e4
LT		 1259 new_settings.t391 < 1 ||
1260 new_settings.t392 < 2 ||
1261 new_settings.n391 < 1 ||
1262 new_settings.n392 < 1 ||
1263 new_settings.n393 < new_settings.n392 ||
1264 new_settings.n393 > 32 ||
1265 (new_settings.dce != 0 &&
1266 new_settings.dce != 1))
1267 return -EINVAL;
1268
1269 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1270 if (result)
1271 return result;
1272
eb2a2fd9 1273 if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */
40d25142 1274 result = attach_hdlc_protocol(dev, &proto,
eb2a2fd9
KH		 1275 sizeof(struct frad_state));
1276 if (result)
1277 return result;
1278 state(hdlc)->first_pvc = NULL;
1279 state(hdlc)->dce_pvc_count = 0;
1da177e4 1280 }
eb2a2fd9
KH		 1281 memcpy(&state(hdlc)->settings, &new_settings, size);
1282
1da177e4 1283 dev->hard_start_xmit = hdlc->xmit;
1da177e4 1284 dev->type = ARPHRD_FRAD;
1da177e4
LT		 1285 return 0;
1286
1287 case IF_PROTO_FR_ADD_PVC:
1288 case IF_PROTO_FR_DEL_PVC:
1289 case IF_PROTO_FR_ADD_ETH_PVC:
1290 case IF_PROTO_FR_DEL_ETH_PVC:
eb2a2fd9
KH		 1291 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1292 return -EINVAL;
1293
1da177e4
LT		 1294 if(!capable(CAP_NET_ADMIN))
1295 return -EPERM;
1296
1297 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
1298 sizeof(fr_proto_pvc)))
1299 return -EFAULT;
1300
1301 if (pvc.dlci <= 0 || pvc.dlci >= 1024)
1302 return -EINVAL; /* Only 10 bits, DLCI 0 reserved */
1303
1304 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
1305 ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
1306 result = ARPHRD_ETHER; /* bridged Ethernet device */
1307 else
1308 result = ARPHRD_DLCI;
1309
1310 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
1311 ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
1312 return fr_add_pvc(dev, pvc.dlci, result);
1313 else
1314 return fr_del_pvc(hdlc, pvc.dlci, result);
1315 }
1316
1317 return -EINVAL;
1318}
eb2a2fd9
KH		 1319
1320
1321static int __init mod_init(void)
1322{
1323 register_hdlc_protocol(&proto);
1324 return 0;
1325}
1326
1327
1328static void __exit mod_exit(void)
1329{
1330 unregister_hdlc_protocol(&proto);
1331}
1332
1333
1334module_init(mod_init);
1335module_exit(mod_exit);
1336
1337MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
1338MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC");
1339MODULE_LICENSE("GPL v2");
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