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Linux-2.6.12-rc2
[mirror_ubuntu-bionic-kernel.git] / drivers / net / wan / hdlc_fr.c
1 /*
2 * Generic HDLC support routines for Linux
3 * Frame Relay support
4 *
5 * Copyright (C) 1999 - 2003 Krzysztof Halasa <khc@pm.waw.pl>
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
30 */
31
32 #include <linux/module.h>
33 #include <linux/kernel.h>
34 #include <linux/slab.h>
35 #include <linux/poll.h>
36 #include <linux/errno.h>
37 #include <linux/if_arp.h>
38 #include <linux/init.h>
39 #include <linux/skbuff.h>
40 #include <linux/pkt_sched.h>
41 #include <linux/random.h>
42 #include <linux/inetdevice.h>
43 #include <linux/lapb.h>
44 #include <linux/rtnetlink.h>
45 #include <linux/etherdevice.h>
46 #include <linux/hdlc.h>
47
48 #undef DEBUG_PKT
49 #undef DEBUG_ECN
50 #undef DEBUG_LINK
51
52 #define MAXLEN_LMISTAT 20 /* max size of status enquiry frame */
53
54 #define PVC_STATE_NEW 0x01
55 #define PVC_STATE_ACTIVE 0x02
56 #define PVC_STATE_FECN 0x08 /* FECN condition */
57 #define PVC_STATE_BECN 0x10 /* BECN condition */
58
59
60 #define FR_UI 0x03
61 #define FR_PAD 0x00
62
63 #define NLPID_IP 0xCC
64 #define NLPID_IPV6 0x8E
65 #define NLPID_SNAP 0x80
66 #define NLPID_PAD 0x00
67 #define NLPID_Q933 0x08
68
69
70 #define LMI_DLCI 0 /* LMI DLCI */
71 #define LMI_PROTO 0x08
72 #define LMI_CALLREF 0x00 /* Call Reference */
73 #define LMI_ANSI_LOCKSHIFT 0x95 /* ANSI lockshift */
74 #define LMI_REPTYPE 1 /* report type */
75 #define LMI_CCITT_REPTYPE 0x51
76 #define LMI_ALIVE 3 /* keep alive */
77 #define LMI_CCITT_ALIVE 0x53
78 #define LMI_PVCSTAT 7 /* pvc status */
79 #define LMI_CCITT_PVCSTAT 0x57
80 #define LMI_FULLREP 0 /* full report */
81 #define LMI_INTEGRITY 1 /* link integrity report */
82 #define LMI_SINGLE 2 /* single pvc report */
83 #define LMI_STATUS_ENQUIRY 0x75
84 #define LMI_STATUS 0x7D /* reply */
85
86 #define LMI_REPT_LEN 1 /* report type element length */
87 #define LMI_INTEG_LEN 2 /* link integrity element length */
88
89 #define LMI_LENGTH 13 /* standard LMI frame length */
90 #define LMI_ANSI_LENGTH 14
91
92
93 typedef struct {
94 #if defined(__LITTLE_ENDIAN_BITFIELD)
95 unsigned ea1: 1;
96 unsigned cr: 1;
97 unsigned dlcih: 6;
98
99 unsigned ea2: 1;
100 unsigned de: 1;
101 unsigned becn: 1;
102 unsigned fecn: 1;
103 unsigned dlcil: 4;
104 #else
105 unsigned dlcih: 6;
106 unsigned cr: 1;
107 unsigned ea1: 1;
108
109 unsigned dlcil: 4;
110 unsigned fecn: 1;
111 unsigned becn: 1;
112 unsigned de: 1;
113 unsigned ea2: 1;
114 #endif
115 }__attribute__ ((packed)) fr_hdr;
116
117
118 static inline u16 q922_to_dlci(u8 *hdr)
119 {
120 return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
121 }
122
123
124
125 static inline void dlci_to_q922(u8 *hdr, u16 dlci)
126 {
127 hdr[0] = (dlci >> 2) & 0xFC;
128 hdr[1] = ((dlci << 4) & 0xF0) | 0x01;
129 }
130
131
132
133 static inline pvc_device* find_pvc(hdlc_device *hdlc, u16 dlci)
134 {
135 pvc_device *pvc = hdlc->state.fr.first_pvc;
136
137 while (pvc) {
138 if (pvc->dlci == dlci)
139 return pvc;
140 if (pvc->dlci > dlci)
141 return NULL; /* the listed is sorted */
142 pvc = pvc->next;
143 }
144
145 return NULL;
146 }
147
148
149 static inline pvc_device* add_pvc(struct net_device *dev, u16 dlci)
150 {
151 hdlc_device *hdlc = dev_to_hdlc(dev);
152 pvc_device *pvc, **pvc_p = &hdlc->state.fr.first_pvc;
153
154 while (*pvc_p) {
155 if ((*pvc_p)->dlci == dlci)
156 return *pvc_p;
157 if ((*pvc_p)->dlci > dlci)
158 break; /* the list is sorted */
159 pvc_p = &(*pvc_p)->next;
160 }
161
162 pvc = kmalloc(sizeof(pvc_device), GFP_ATOMIC);
163 if (!pvc)
164 return NULL;
165
166 memset(pvc, 0, sizeof(pvc_device));
167 pvc->dlci = dlci;
168 pvc->master = dev;
169 pvc->next = *pvc_p; /* Put it in the chain */
170 *pvc_p = pvc;
171 return pvc;
172 }
173
174
175 static inline int pvc_is_used(pvc_device *pvc)
176 {
177 return pvc->main != NULL || pvc->ether != NULL;
178 }
179
180
181 static inline void pvc_carrier(int on, pvc_device *pvc)
182 {
183 if (on) {
184 if (pvc->main)
185 if (!netif_carrier_ok(pvc->main))
186 netif_carrier_on(pvc->main);
187 if (pvc->ether)
188 if (!netif_carrier_ok(pvc->ether))
189 netif_carrier_on(pvc->ether);
190 } else {
191 if (pvc->main)
192 if (netif_carrier_ok(pvc->main))
193 netif_carrier_off(pvc->main);
194 if (pvc->ether)
195 if (netif_carrier_ok(pvc->ether))
196 netif_carrier_off(pvc->ether);
197 }
198 }
199
200
201 static inline void delete_unused_pvcs(hdlc_device *hdlc)
202 {
203 pvc_device **pvc_p = &hdlc->state.fr.first_pvc;
204
205 while (*pvc_p) {
206 if (!pvc_is_used(*pvc_p)) {
207 pvc_device *pvc = *pvc_p;
208 *pvc_p = pvc->next;
209 kfree(pvc);
210 continue;
211 }
212 pvc_p = &(*pvc_p)->next;
213 }
214 }
215
216
217 static inline struct net_device** get_dev_p(pvc_device *pvc, int type)
218 {
219 if (type == ARPHRD_ETHER)
220 return &pvc->ether;
221 else
222 return &pvc->main;
223 }
224
225
226 static inline u16 status_to_dlci(u8 *status, int *active, int *new)
227 {
228 *new = (status[2] & 0x08) ? 1 : 0;
229 *active = (status[2] & 0x02) ? 1 : 0;
230
231 return ((status[0] & 0x3F) << 4) | ((status[1] & 0x78) >> 3);
232 }
233
234
235 static inline void dlci_to_status(u16 dlci, u8 *status, int active, int new)
236 {
237 status[0] = (dlci >> 4) & 0x3F;
238 status[1] = ((dlci << 3) & 0x78) | 0x80;
239 status[2] = 0x80;
240
241 if (new)
242 status[2] |= 0x08;
243 else if (active)
244 status[2] |= 0x02;
245 }
246
247
248
249 static int fr_hard_header(struct sk_buff **skb_p, u16 dlci)
250 {
251 u16 head_len;
252 struct sk_buff *skb = *skb_p;
253
254 switch (skb->protocol) {
255 case __constant_ntohs(ETH_P_IP):
256 head_len = 4;
257 skb_push(skb, head_len);
258 skb->data[3] = NLPID_IP;
259 break;
260
261 case __constant_ntohs(ETH_P_IPV6):
262 head_len = 4;
263 skb_push(skb, head_len);
264 skb->data[3] = NLPID_IPV6;
265 break;
266
267 case __constant_ntohs(LMI_PROTO):
268 head_len = 4;
269 skb_push(skb, head_len);
270 skb->data[3] = LMI_PROTO;
271 break;
272
273 case __constant_ntohs(ETH_P_802_3):
274 head_len = 10;
275 if (skb_headroom(skb) < head_len) {
276 struct sk_buff *skb2 = skb_realloc_headroom(skb,
277 head_len);
278 if (!skb2)
279 return -ENOBUFS;
280 dev_kfree_skb(skb);
281 skb = *skb_p = skb2;
282 }
283 skb_push(skb, head_len);
284 skb->data[3] = FR_PAD;
285 skb->data[4] = NLPID_SNAP;
286 skb->data[5] = FR_PAD;
287 skb->data[6] = 0x80;
288 skb->data[7] = 0xC2;
289 skb->data[8] = 0x00;
290 skb->data[9] = 0x07; /* bridged Ethernet frame w/out FCS */
291 break;
292
293 default:
294 head_len = 10;
295 skb_push(skb, head_len);
296 skb->data[3] = FR_PAD;
297 skb->data[4] = NLPID_SNAP;
298 skb->data[5] = FR_PAD;
299 skb->data[6] = FR_PAD;
300 skb->data[7] = FR_PAD;
301 *(u16*)(skb->data + 8) = skb->protocol;
302 }
303
304 dlci_to_q922(skb->data, dlci);
305 skb->data[2] = FR_UI;
306 return 0;
307 }
308
309
310
311 static int pvc_open(struct net_device *dev)
312 {
313 pvc_device *pvc = dev_to_pvc(dev);
314
315 if ((pvc->master->flags & IFF_UP) == 0)
316 return -EIO; /* Master must be UP in order to activate PVC */
317
318 if (pvc->open_count++ == 0) {
319 hdlc_device *hdlc = dev_to_hdlc(pvc->master);
320 if (hdlc->state.fr.settings.lmi == LMI_NONE)
321 pvc->state.active = hdlc->carrier;
322
323 pvc_carrier(pvc->state.active, pvc);
324 hdlc->state.fr.dce_changed = 1;
325 }
326 return 0;
327 }
328
329
330
331 static int pvc_close(struct net_device *dev)
332 {
333 pvc_device *pvc = dev_to_pvc(dev);
334
335 if (--pvc->open_count == 0) {
336 hdlc_device *hdlc = dev_to_hdlc(pvc->master);
337 if (hdlc->state.fr.settings.lmi == LMI_NONE)
338 pvc->state.active = 0;
339
340 if (hdlc->state.fr.settings.dce) {
341 hdlc->state.fr.dce_changed = 1;
342 pvc->state.active = 0;
343 }
344 }
345 return 0;
346 }
347
348
349
350 int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
351 {
352 pvc_device *pvc = dev_to_pvc(dev);
353 fr_proto_pvc_info info;
354
355 if (ifr->ifr_settings.type == IF_GET_PROTO) {
356 if (dev->type == ARPHRD_ETHER)
357 ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
358 else
359 ifr->ifr_settings.type = IF_PROTO_FR_PVC;
360
361 if (ifr->ifr_settings.size < sizeof(info)) {
362 /* data size wanted */
363 ifr->ifr_settings.size = sizeof(info);
364 return -ENOBUFS;
365 }
366
367 info.dlci = pvc->dlci;
368 memcpy(info.master, pvc->master->name, IFNAMSIZ);
369 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
370 &info, sizeof(info)))
371 return -EFAULT;
372 return 0;
373 }
374
375 return -EINVAL;
376 }
377
378
379 static inline struct net_device_stats *pvc_get_stats(struct net_device *dev)
380 {
381 return netdev_priv(dev);
382 }
383
384
385
386 static int pvc_xmit(struct sk_buff *skb, struct net_device *dev)
387 {
388 pvc_device *pvc = dev_to_pvc(dev);
389 struct net_device_stats *stats = pvc_get_stats(dev);
390
391 if (pvc->state.active) {
392 if (dev->type == ARPHRD_ETHER) {
393 int pad = ETH_ZLEN - skb->len;
394 if (pad > 0) { /* Pad the frame with zeros */
395 int len = skb->len;
396 if (skb_tailroom(skb) < pad)
397 if (pskb_expand_head(skb, 0, pad,
398 GFP_ATOMIC)) {
399 stats->tx_dropped++;
400 dev_kfree_skb(skb);
401 return 0;
402 }
403 skb_put(skb, pad);
404 memset(skb->data + len, 0, pad);
405 }
406 skb->protocol = __constant_htons(ETH_P_802_3);
407 }
408 if (!fr_hard_header(&skb, pvc->dlci)) {
409 stats->tx_bytes += skb->len;
410 stats->tx_packets++;
411 if (pvc->state.fecn) /* TX Congestion counter */
412 stats->tx_compressed++;
413 skb->dev = pvc->master;
414 dev_queue_xmit(skb);
415 return 0;
416 }
417 }
418
419 stats->tx_dropped++;
420 dev_kfree_skb(skb);
421 return 0;
422 }
423
424
425
426 static int pvc_change_mtu(struct net_device *dev, int new_mtu)
427 {
428 if ((new_mtu < 68) || (new_mtu > HDLC_MAX_MTU))
429 return -EINVAL;
430 dev->mtu = new_mtu;
431 return 0;
432 }
433
434
435
436 static inline void fr_log_dlci_active(pvc_device *pvc)
437 {
438 printk(KERN_INFO "%s: DLCI %d [%s%s%s]%s %s\n",
439 pvc->master->name,
440 pvc->dlci,
441 pvc->main ? pvc->main->name : "",
442 pvc->main && pvc->ether ? " " : "",
443 pvc->ether ? pvc->ether->name : "",
444 pvc->state.new ? " new" : "",
445 !pvc->state.exist ? "deleted" :
446 pvc->state.active ? "active" : "inactive");
447 }
448
449
450
451 static inline u8 fr_lmi_nextseq(u8 x)
452 {
453 x++;
454 return x ? x : 1;
455 }
456
457
458
459 static void fr_lmi_send(struct net_device *dev, int fullrep)
460 {
461 hdlc_device *hdlc = dev_to_hdlc(dev);
462 struct sk_buff *skb;
463 pvc_device *pvc = hdlc->state.fr.first_pvc;
464 int len = (hdlc->state.fr.settings.lmi == LMI_ANSI) ? LMI_ANSI_LENGTH
465 : LMI_LENGTH;
466 int stat_len = 3;
467 u8 *data;
468 int i = 0;
469
470 if (hdlc->state.fr.settings.dce && fullrep) {
471 len += hdlc->state.fr.dce_pvc_count * (2 + stat_len);
472 if (len > HDLC_MAX_MRU) {
473 printk(KERN_WARNING "%s: Too many PVCs while sending "
474 "LMI full report\n", dev->name);
475 return;
476 }
477 }
478
479 skb = dev_alloc_skb(len);
480 if (!skb) {
481 printk(KERN_WARNING "%s: Memory squeeze on fr_lmi_send()\n",
482 dev->name);
483 return;
484 }
485 memset(skb->data, 0, len);
486 skb_reserve(skb, 4);
487 skb->protocol = __constant_htons(LMI_PROTO);
488 fr_hard_header(&skb, LMI_DLCI);
489 data = skb->tail;
490 data[i++] = LMI_CALLREF;
491 data[i++] = hdlc->state.fr.settings.dce
492 ? LMI_STATUS : LMI_STATUS_ENQUIRY;
493 if (hdlc->state.fr.settings.lmi == LMI_ANSI)
494 data[i++] = LMI_ANSI_LOCKSHIFT;
495 data[i++] = (hdlc->state.fr.settings.lmi == LMI_CCITT)
496 ? LMI_CCITT_REPTYPE : LMI_REPTYPE;
497 data[i++] = LMI_REPT_LEN;
498 data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
499
500 data[i++] = (hdlc->state.fr.settings.lmi == LMI_CCITT)
501 ? LMI_CCITT_ALIVE : LMI_ALIVE;
502 data[i++] = LMI_INTEG_LEN;
503 data[i++] = hdlc->state.fr.txseq =fr_lmi_nextseq(hdlc->state.fr.txseq);
504 data[i++] = hdlc->state.fr.rxseq;
505
506 if (hdlc->state.fr.settings.dce && fullrep) {
507 while (pvc) {
508 data[i++] = (hdlc->state.fr.settings.lmi == LMI_CCITT)
509 ? LMI_CCITT_PVCSTAT : LMI_PVCSTAT;
510 data[i++] = stat_len;
511
512 /* LMI start/restart */
513 if (hdlc->state.fr.reliable && !pvc->state.exist) {
514 pvc->state.exist = pvc->state.new = 1;
515 fr_log_dlci_active(pvc);
516 }
517
518 /* ifconfig PVC up */
519 if (pvc->open_count && !pvc->state.active &&
520 pvc->state.exist && !pvc->state.new) {
521 pvc_carrier(1, pvc);
522 pvc->state.active = 1;
523 fr_log_dlci_active(pvc);
524 }
525
526 dlci_to_status(pvc->dlci, data + i,
527 pvc->state.active, pvc->state.new);
528 i += stat_len;
529 pvc = pvc->next;
530 }
531 }
532
533 skb_put(skb, i);
534 skb->priority = TC_PRIO_CONTROL;
535 skb->dev = dev;
536 skb->nh.raw = skb->data;
537
538 dev_queue_xmit(skb);
539 }
540
541
542
543 static void fr_set_link_state(int reliable, struct net_device *dev)
544 {
545 hdlc_device *hdlc = dev_to_hdlc(dev);
546 pvc_device *pvc = hdlc->state.fr.first_pvc;
547
548 hdlc->state.fr.reliable = reliable;
549 if (reliable) {
550 if (!netif_carrier_ok(dev))
551 netif_carrier_on(dev);
552
553 hdlc->state.fr.n391cnt = 0; /* Request full status */
554 hdlc->state.fr.dce_changed = 1;
555
556 if (hdlc->state.fr.settings.lmi == LMI_NONE) {
557 while (pvc) { /* Activate all PVCs */
558 pvc_carrier(1, pvc);
559 pvc->state.exist = pvc->state.active = 1;
560 pvc->state.new = 0;
561 pvc = pvc->next;
562 }
563 }
564 } else {
565 if (netif_carrier_ok(dev))
566 netif_carrier_off(dev);
567
568 while (pvc) { /* Deactivate all PVCs */
569 pvc_carrier(0, pvc);
570 pvc->state.exist = pvc->state.active = 0;
571 pvc->state.new = 0;
572 pvc = pvc->next;
573 }
574 }
575 }
576
577
578
579 static void fr_timer(unsigned long arg)
580 {
581 struct net_device *dev = (struct net_device *)arg;
582 hdlc_device *hdlc = dev_to_hdlc(dev);
583 int i, cnt = 0, reliable;
584 u32 list;
585
586 if (hdlc->state.fr.settings.dce)
587 reliable = hdlc->state.fr.request &&
588 time_before(jiffies, hdlc->state.fr.last_poll +
589 hdlc->state.fr.settings.t392 * HZ);
590 else {
591 hdlc->state.fr.last_errors <<= 1; /* Shift the list */
592 if (hdlc->state.fr.request) {
593 if (hdlc->state.fr.reliable)
594 printk(KERN_INFO "%s: No LMI status reply "
595 "received\n", dev->name);
596 hdlc->state.fr.last_errors |= 1;
597 }
598
599 list = hdlc->state.fr.last_errors;
600 for (i = 0; i < hdlc->state.fr.settings.n393; i++, list >>= 1)
601 cnt += (list & 1); /* errors count */
602
603 reliable = (cnt < hdlc->state.fr.settings.n392);
604 }
605
606 if (hdlc->state.fr.reliable != reliable) {
607 printk(KERN_INFO "%s: Link %sreliable\n", dev->name,
608 reliable ? "" : "un");
609 fr_set_link_state(reliable, dev);
610 }
611
612 if (hdlc->state.fr.settings.dce)
613 hdlc->state.fr.timer.expires = jiffies +
614 hdlc->state.fr.settings.t392 * HZ;
615 else {
616 if (hdlc->state.fr.n391cnt)
617 hdlc->state.fr.n391cnt--;
618
619 fr_lmi_send(dev, hdlc->state.fr.n391cnt == 0);
620
621 hdlc->state.fr.last_poll = jiffies;
622 hdlc->state.fr.request = 1;
623 hdlc->state.fr.timer.expires = jiffies +
624 hdlc->state.fr.settings.t391 * HZ;
625 }
626
627 hdlc->state.fr.timer.function = fr_timer;
628 hdlc->state.fr.timer.data = arg;
629 add_timer(&hdlc->state.fr.timer);
630 }
631
632
633
634 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
635 {
636 hdlc_device *hdlc = dev_to_hdlc(dev);
637 int stat_len;
638 pvc_device *pvc;
639 int reptype = -1, error, no_ram;
640 u8 rxseq, txseq;
641 int i;
642
643 if (skb->len < ((hdlc->state.fr.settings.lmi == LMI_ANSI)
644 ? LMI_ANSI_LENGTH : LMI_LENGTH)) {
645 printk(KERN_INFO "%s: Short LMI frame\n", dev->name);
646 return 1;
647 }
648
649 if (skb->data[5] != (!hdlc->state.fr.settings.dce ?
650 LMI_STATUS : LMI_STATUS_ENQUIRY)) {
651 printk(KERN_INFO "%s: LMI msgtype=%x, Not LMI status %s\n",
652 dev->name, skb->data[2],
653 hdlc->state.fr.settings.dce ? "enquiry" : "reply");
654 return 1;
655 }
656
657 i = (hdlc->state.fr.settings.lmi == LMI_ANSI) ? 7 : 6;
658
659 if (skb->data[i] !=
660 ((hdlc->state.fr.settings.lmi == LMI_CCITT)
661 ? LMI_CCITT_REPTYPE : LMI_REPTYPE)) {
662 printk(KERN_INFO "%s: Not a report type=%x\n",
663 dev->name, skb->data[i]);
664 return 1;
665 }
666 i++;
667
668 i++; /* Skip length field */
669
670 reptype = skb->data[i++];
671
672 if (skb->data[i]!=
673 ((hdlc->state.fr.settings.lmi == LMI_CCITT)
674 ? LMI_CCITT_ALIVE : LMI_ALIVE)) {
675 printk(KERN_INFO "%s: Unsupported status element=%x\n",
676 dev->name, skb->data[i]);
677 return 1;
678 }
679 i++;
680
681 i++; /* Skip length field */
682
683 hdlc->state.fr.rxseq = skb->data[i++]; /* TX sequence from peer */
684 rxseq = skb->data[i++]; /* Should confirm our sequence */
685
686 txseq = hdlc->state.fr.txseq;
687
688 if (hdlc->state.fr.settings.dce) {
689 if (reptype != LMI_FULLREP && reptype != LMI_INTEGRITY) {
690 printk(KERN_INFO "%s: Unsupported report type=%x\n",
691 dev->name, reptype);
692 return 1;
693 }
694 hdlc->state.fr.last_poll = jiffies;
695 }
696
697 error = 0;
698 if (!hdlc->state.fr.reliable)
699 error = 1;
700
701 if (rxseq == 0 || rxseq != txseq) {
702 hdlc->state.fr.n391cnt = 0; /* Ask for full report next time */
703 error = 1;
704 }
705
706 if (hdlc->state.fr.settings.dce) {
707 if (hdlc->state.fr.fullrep_sent && !error) {
708 /* Stop sending full report - the last one has been confirmed by DTE */
709 hdlc->state.fr.fullrep_sent = 0;
710 pvc = hdlc->state.fr.first_pvc;
711 while (pvc) {
712 if (pvc->state.new) {
713 pvc->state.new = 0;
714
715 /* Tell DTE that new PVC is now active */
716 hdlc->state.fr.dce_changed = 1;
717 }
718 pvc = pvc->next;
719 }
720 }
721
722 if (hdlc->state.fr.dce_changed) {
723 reptype = LMI_FULLREP;
724 hdlc->state.fr.fullrep_sent = 1;
725 hdlc->state.fr.dce_changed = 0;
726 }
727
728 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
729 return 0;
730 }
731
732 /* DTE */
733
734 hdlc->state.fr.request = 0; /* got response, no request pending */
735
736 if (error)
737 return 0;
738
739 if (reptype != LMI_FULLREP)
740 return 0;
741
742 stat_len = 3;
743 pvc = hdlc->state.fr.first_pvc;
744
745 while (pvc) {
746 pvc->state.deleted = 1;
747 pvc = pvc->next;
748 }
749
750 no_ram = 0;
751 while (skb->len >= i + 2 + stat_len) {
752 u16 dlci;
753 unsigned int active, new;
754
755 if (skb->data[i] != ((hdlc->state.fr.settings.lmi == LMI_CCITT)
756 ? LMI_CCITT_PVCSTAT : LMI_PVCSTAT)) {
757 printk(KERN_WARNING "%s: Invalid PVCSTAT ID: %x\n",
758 dev->name, skb->data[i]);
759 return 1;
760 }
761 i++;
762
763 if (skb->data[i] != stat_len) {
764 printk(KERN_WARNING "%s: Invalid PVCSTAT length: %x\n",
765 dev->name, skb->data[i]);
766 return 1;
767 }
768 i++;
769
770 dlci = status_to_dlci(skb->data + i, &active, &new);
771
772 pvc = add_pvc(dev, dlci);
773
774 if (!pvc && !no_ram) {
775 printk(KERN_WARNING
776 "%s: Memory squeeze on fr_lmi_recv()\n",
777 dev->name);
778 no_ram = 1;
779 }
780
781 if (pvc) {
782 pvc->state.exist = 1;
783 pvc->state.deleted = 0;
784 if (active != pvc->state.active ||
785 new != pvc->state.new ||
786 !pvc->state.exist) {
787 pvc->state.new = new;
788 pvc->state.active = active;
789 pvc_carrier(active, pvc);
790 fr_log_dlci_active(pvc);
791 }
792 }
793
794 i += stat_len;
795 }
796
797 pvc = hdlc->state.fr.first_pvc;
798
799 while (pvc) {
800 if (pvc->state.deleted && pvc->state.exist) {
801 pvc_carrier(0, pvc);
802 pvc->state.active = pvc->state.new = 0;
803 pvc->state.exist = 0;
804 fr_log_dlci_active(pvc);
805 }
806 pvc = pvc->next;
807 }
808
809 /* Next full report after N391 polls */
810 hdlc->state.fr.n391cnt = hdlc->state.fr.settings.n391;
811
812 return 0;
813 }
814
815
816
817 static int fr_rx(struct sk_buff *skb)
818 {
819 struct net_device *ndev = skb->dev;
820 hdlc_device *hdlc = dev_to_hdlc(ndev);
821 fr_hdr *fh = (fr_hdr*)skb->data;
822 u8 *data = skb->data;
823 u16 dlci;
824 pvc_device *pvc;
825 struct net_device *dev = NULL;
826
827 if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
828 goto rx_error;
829
830 dlci = q922_to_dlci(skb->data);
831
832 if (dlci == LMI_DLCI) {
833 if (hdlc->state.fr.settings.lmi == LMI_NONE)
834 goto rx_error; /* LMI packet with no LMI? */
835
836 if (data[3] == LMI_PROTO) {
837 if (fr_lmi_recv(ndev, skb))
838 goto rx_error;
839 else {
840 dev_kfree_skb_any(skb);
841 return NET_RX_SUCCESS;
842 }
843 }
844
845 printk(KERN_INFO "%s: Received non-LMI frame with LMI DLCI\n",
846 ndev->name);
847 goto rx_error;
848 }
849
850 pvc = find_pvc(hdlc, dlci);
851 if (!pvc) {
852 #ifdef DEBUG_PKT
853 printk(KERN_INFO "%s: No PVC for received frame's DLCI %d\n",
854 ndev->name, dlci);
855 #endif
856 dev_kfree_skb_any(skb);
857 return NET_RX_DROP;
858 }
859
860 if (pvc->state.fecn != fh->fecn) {
861 #ifdef DEBUG_ECN
862 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", ndev->name,
863 dlci, fh->fecn ? "N" : "FF");
864 #endif
865 pvc->state.fecn ^= 1;
866 }
867
868 if (pvc->state.becn != fh->becn) {
869 #ifdef DEBUG_ECN
870 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", ndev->name,
871 dlci, fh->becn ? "N" : "FF");
872 #endif
873 pvc->state.becn ^= 1;
874 }
875
876
877 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
878 hdlc->stats.rx_dropped++;
879 return NET_RX_DROP;
880 }
881
882 if (data[3] == NLPID_IP) {
883 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
884 dev = pvc->main;
885 skb->protocol = htons(ETH_P_IP);
886
887 } else if (data[3] == NLPID_IPV6) {
888 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
889 dev = pvc->main;
890 skb->protocol = htons(ETH_P_IPV6);
891
892 } else if (skb->len > 10 && data[3] == FR_PAD &&
893 data[4] == NLPID_SNAP && data[5] == FR_PAD) {
894 u16 oui = ntohs(*(u16*)(data + 6));
895 u16 pid = ntohs(*(u16*)(data + 8));
896 skb_pull(skb, 10);
897
898 switch ((((u32)oui) << 16) | pid) {
899 case ETH_P_ARP: /* routed frame with SNAP */
900 case ETH_P_IPX:
901 case ETH_P_IP: /* a long variant */
902 case ETH_P_IPV6:
903 dev = pvc->main;
904 skb->protocol = htons(pid);
905 break;
906
907 case 0x80C20007: /* bridged Ethernet frame */
908 if ((dev = pvc->ether) != NULL)
909 skb->protocol = eth_type_trans(skb, dev);
910 break;
911
912 default:
913 printk(KERN_INFO "%s: Unsupported protocol, OUI=%x "
914 "PID=%x\n", ndev->name, oui, pid);
915 dev_kfree_skb_any(skb);
916 return NET_RX_DROP;
917 }
918 } else {
919 printk(KERN_INFO "%s: Unsupported protocol, NLPID=%x "
920 "length = %i\n", ndev->name, data[3], skb->len);
921 dev_kfree_skb_any(skb);
922 return NET_RX_DROP;
923 }
924
925 if (dev) {
926 struct net_device_stats *stats = pvc_get_stats(dev);
927 stats->rx_packets++; /* PVC traffic */
928 stats->rx_bytes += skb->len;
929 if (pvc->state.becn)
930 stats->rx_compressed++;
931 skb->dev = dev;
932 netif_rx(skb);
933 return NET_RX_SUCCESS;
934 } else {
935 dev_kfree_skb_any(skb);
936 return NET_RX_DROP;
937 }
938
939 rx_error:
940 hdlc->stats.rx_errors++; /* Mark error */
941 dev_kfree_skb_any(skb);
942 return NET_RX_DROP;
943 }
944
945
946
947 static void fr_start(struct net_device *dev)
948 {
949 hdlc_device *hdlc = dev_to_hdlc(dev);
950 #ifdef DEBUG_LINK
951 printk(KERN_DEBUG "fr_start\n");
952 #endif
953 if (hdlc->state.fr.settings.lmi != LMI_NONE) {
954 hdlc->state.fr.reliable = 0;
955 hdlc->state.fr.dce_changed = 1;
956 hdlc->state.fr.request = 0;
957 hdlc->state.fr.fullrep_sent = 0;
958 hdlc->state.fr.last_errors = 0xFFFFFFFF;
959 hdlc->state.fr.n391cnt = 0;
960 hdlc->state.fr.txseq = hdlc->state.fr.rxseq = 0;
961
962 init_timer(&hdlc->state.fr.timer);
963 /* First poll after 1 s */
964 hdlc->state.fr.timer.expires = jiffies + HZ;
965 hdlc->state.fr.timer.function = fr_timer;
966 hdlc->state.fr.timer.data = (unsigned long)dev;
967 add_timer(&hdlc->state.fr.timer);
968 } else
969 fr_set_link_state(1, dev);
970 }
971
972
973
974 static void fr_stop(struct net_device *dev)
975 {
976 hdlc_device *hdlc = dev_to_hdlc(dev);
977 #ifdef DEBUG_LINK
978 printk(KERN_DEBUG "fr_stop\n");
979 #endif
980 if (hdlc->state.fr.settings.lmi != LMI_NONE)
981 del_timer_sync(&hdlc->state.fr.timer);
982 fr_set_link_state(0, dev);
983 }
984
985
986
987 static void fr_close(struct net_device *dev)
988 {
989 hdlc_device *hdlc = dev_to_hdlc(dev);
990 pvc_device *pvc = hdlc->state.fr.first_pvc;
991
992 while (pvc) { /* Shutdown all PVCs for this FRAD */
993 if (pvc->main)
994 dev_close(pvc->main);
995 if (pvc->ether)
996 dev_close(pvc->ether);
997 pvc = pvc->next;
998 }
999 }
1000
1001 static void dlci_setup(struct net_device *dev)
1002 {
1003 dev->type = ARPHRD_DLCI;
1004 dev->flags = IFF_POINTOPOINT;
1005 dev->hard_header_len = 10;
1006 dev->addr_len = 2;
1007 }
1008
1009 static int fr_add_pvc(struct net_device *master, unsigned int dlci, int type)
1010 {
1011 hdlc_device *hdlc = dev_to_hdlc(master);
1012 pvc_device *pvc = NULL;
1013 struct net_device *dev;
1014 int result, used;
1015 char * prefix = "pvc%d";
1016
1017 if (type == ARPHRD_ETHER)
1018 prefix = "pvceth%d";
1019
1020 if ((pvc = add_pvc(master, dlci)) == NULL) {
1021 printk(KERN_WARNING "%s: Memory squeeze on fr_add_pvc()\n",
1022 master->name);
1023 return -ENOBUFS;
1024 }
1025
1026 if (*get_dev_p(pvc, type))
1027 return -EEXIST;
1028
1029 used = pvc_is_used(pvc);
1030
1031 if (type == ARPHRD_ETHER)
1032 dev = alloc_netdev(sizeof(struct net_device_stats),
1033 "pvceth%d", ether_setup);
1034 else
1035 dev = alloc_netdev(sizeof(struct net_device_stats),
1036 "pvc%d", dlci_setup);
1037
1038 if (!dev) {
1039 printk(KERN_WARNING "%s: Memory squeeze on fr_pvc()\n",
1040 master->name);
1041 delete_unused_pvcs(hdlc);
1042 return -ENOBUFS;
1043 }
1044
1045 if (type == ARPHRD_ETHER) {
1046 memcpy(dev->dev_addr, "\x00\x01", 2);
1047 get_random_bytes(dev->dev_addr + 2, ETH_ALEN - 2);
1048 } else {
1049 *(u16*)dev->dev_addr = htons(dlci);
1050 dlci_to_q922(dev->broadcast, dlci);
1051 }
1052 dev->hard_start_xmit = pvc_xmit;
1053 dev->get_stats = pvc_get_stats;
1054 dev->open = pvc_open;
1055 dev->stop = pvc_close;
1056 dev->do_ioctl = pvc_ioctl;
1057 dev->change_mtu = pvc_change_mtu;
1058 dev->mtu = HDLC_MAX_MTU;
1059 dev->tx_queue_len = 0;
1060 dev->priv = pvc;
1061
1062 result = dev_alloc_name(dev, dev->name);
1063 if (result < 0) {
1064 free_netdev(dev);
1065 delete_unused_pvcs(hdlc);
1066 return result;
1067 }
1068
1069 if (register_netdevice(dev) != 0) {
1070 free_netdev(dev);
1071 delete_unused_pvcs(hdlc);
1072 return -EIO;
1073 }
1074
1075 dev->destructor = free_netdev;
1076 *get_dev_p(pvc, type) = dev;
1077 if (!used) {
1078 hdlc->state.fr.dce_changed = 1;
1079 hdlc->state.fr.dce_pvc_count++;
1080 }
1081 return 0;
1082 }
1083
1084
1085
1086 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
1087 {
1088 pvc_device *pvc;
1089 struct net_device *dev;
1090
1091 if ((pvc = find_pvc(hdlc, dlci)) == NULL)
1092 return -ENOENT;
1093
1094 if ((dev = *get_dev_p(pvc, type)) == NULL)
1095 return -ENOENT;
1096
1097 if (dev->flags & IFF_UP)
1098 return -EBUSY; /* PVC in use */
1099
1100 unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
1101 *get_dev_p(pvc, type) = NULL;
1102
1103 if (!pvc_is_used(pvc)) {
1104 hdlc->state.fr.dce_pvc_count--;
1105 hdlc->state.fr.dce_changed = 1;
1106 }
1107 delete_unused_pvcs(hdlc);
1108 return 0;
1109 }
1110
1111
1112
1113 static void fr_destroy(hdlc_device *hdlc)
1114 {
1115 pvc_device *pvc;
1116
1117 pvc = hdlc->state.fr.first_pvc;
1118 hdlc->state.fr.first_pvc = NULL; /* All PVCs destroyed */
1119 hdlc->state.fr.dce_pvc_count = 0;
1120 hdlc->state.fr.dce_changed = 1;
1121
1122 while (pvc) {
1123 pvc_device *next = pvc->next;
1124 /* destructors will free_netdev() main and ether */
1125 if (pvc->main)
1126 unregister_netdevice(pvc->main);
1127
1128 if (pvc->ether)
1129 unregister_netdevice(pvc->ether);
1130
1131 kfree(pvc);
1132 pvc = next;
1133 }
1134 }
1135
1136
1137
1138 int hdlc_fr_ioctl(struct net_device *dev, struct ifreq *ifr)
1139 {
1140 fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
1141 const size_t size = sizeof(fr_proto);
1142 fr_proto new_settings;
1143 hdlc_device *hdlc = dev_to_hdlc(dev);
1144 fr_proto_pvc pvc;
1145 int result;
1146
1147 switch (ifr->ifr_settings.type) {
1148 case IF_GET_PROTO:
1149 ifr->ifr_settings.type = IF_PROTO_FR;
1150 if (ifr->ifr_settings.size < size) {
1151 ifr->ifr_settings.size = size; /* data size wanted */
1152 return -ENOBUFS;
1153 }
1154 if (copy_to_user(fr_s, &hdlc->state.fr.settings, size))
1155 return -EFAULT;
1156 return 0;
1157
1158 case IF_PROTO_FR:
1159 if(!capable(CAP_NET_ADMIN))
1160 return -EPERM;
1161
1162 if(dev->flags & IFF_UP)
1163 return -EBUSY;
1164
1165 if (copy_from_user(&new_settings, fr_s, size))
1166 return -EFAULT;
1167
1168 if (new_settings.lmi == LMI_DEFAULT)
1169 new_settings.lmi = LMI_ANSI;
1170
1171 if ((new_settings.lmi != LMI_NONE &&
1172 new_settings.lmi != LMI_ANSI &&
1173 new_settings.lmi != LMI_CCITT) ||
1174 new_settings.t391 < 1 ||
1175 new_settings.t392 < 2 ||
1176 new_settings.n391 < 1 ||
1177 new_settings.n392 < 1 ||
1178 new_settings.n393 < new_settings.n392 ||
1179 new_settings.n393 > 32 ||
1180 (new_settings.dce != 0 &&
1181 new_settings.dce != 1))
1182 return -EINVAL;
1183
1184 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1185 if (result)
1186 return result;
1187
1188 if (hdlc->proto.id != IF_PROTO_FR) {
1189 hdlc_proto_detach(hdlc);
1190 hdlc->state.fr.first_pvc = NULL;
1191 hdlc->state.fr.dce_pvc_count = 0;
1192 }
1193 memcpy(&hdlc->state.fr.settings, &new_settings, size);
1194 memset(&hdlc->proto, 0, sizeof(hdlc->proto));
1195
1196 hdlc->proto.close = fr_close;
1197 hdlc->proto.start = fr_start;
1198 hdlc->proto.stop = fr_stop;
1199 hdlc->proto.detach = fr_destroy;
1200 hdlc->proto.netif_rx = fr_rx;
1201 hdlc->proto.id = IF_PROTO_FR;
1202 dev->hard_start_xmit = hdlc->xmit;
1203 dev->hard_header = NULL;
1204 dev->type = ARPHRD_FRAD;
1205 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1206 dev->addr_len = 0;
1207 return 0;
1208
1209 case IF_PROTO_FR_ADD_PVC:
1210 case IF_PROTO_FR_DEL_PVC:
1211 case IF_PROTO_FR_ADD_ETH_PVC:
1212 case IF_PROTO_FR_DEL_ETH_PVC:
1213 if(!capable(CAP_NET_ADMIN))
1214 return -EPERM;
1215
1216 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
1217 sizeof(fr_proto_pvc)))
1218 return -EFAULT;
1219
1220 if (pvc.dlci <= 0 || pvc.dlci >= 1024)
1221 return -EINVAL; /* Only 10 bits, DLCI 0 reserved */
1222
1223 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
1224 ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
1225 result = ARPHRD_ETHER; /* bridged Ethernet device */
1226 else
1227 result = ARPHRD_DLCI;
1228
1229 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
1230 ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
1231 return fr_add_pvc(dev, pvc.dlci, result);
1232 else
1233 return fr_del_pvc(hdlc, pvc.dlci, result);
1234 }
1235
1236 return -EINVAL;
1237 }
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