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7bb737bbdeb96cf09b1628e31b51c50c58f25372
[deliverable/linux.git] / drivers / net / wan / hdlc_fr.c
1 /*
2 * Generic HDLC support routines for Linux
3 * Frame Relay support
4 *
5 * Copyright (C) 1999 - 2005 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 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
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>
45 #include <linux/random.h>
46 #include <linux/inetdevice.h>
47 #include <linux/lapb.h>
48 #include <linux/rtnetlink.h>
49 #include <linux/etherdevice.h>
50 #include <linux/hdlc.h>
51
52 #undef DEBUG_PKT
53 #undef DEBUG_ECN
54 #undef DEBUG_LINK
55
56 #define FR_UI 0x03
57 #define FR_PAD 0x00
58
59 #define NLPID_IP 0xCC
60 #define NLPID_IPV6 0x8E
61 #define NLPID_SNAP 0x80
62 #define NLPID_PAD 0x00
63 #define NLPID_CCITT_ANSI_LMI 0x08
64 #define NLPID_CISCO_LMI 0x09
65
66
67 #define LMI_CCITT_ANSI_DLCI 0 /* LMI DLCI */
68 #define LMI_CISCO_DLCI 1023
69
70 #define LMI_CALLREF 0x00 /* Call Reference */
71 #define LMI_ANSI_LOCKSHIFT 0x95 /* ANSI locking shift */
72 #define LMI_ANSI_CISCO_REPTYPE 0x01 /* report type */
73 #define LMI_CCITT_REPTYPE 0x51
74 #define LMI_ANSI_CISCO_ALIVE 0x03 /* keep alive */
75 #define LMI_CCITT_ALIVE 0x53
76 #define LMI_ANSI_CISCO_PVCSTAT 0x07 /* PVC status */
77 #define LMI_CCITT_PVCSTAT 0x57
78
79 #define LMI_FULLREP 0x00 /* full report */
80 #define LMI_INTEGRITY 0x01 /* link integrity report */
81 #define LMI_SINGLE 0x02 /* single PVC report */
82
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_CCITT_CISCO_LENGTH 13 /* LMI frame lengths */
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 int fr_hard_header(struct sk_buff **skb_p, u16 dlci)
227 {
228 u16 head_len;
229 struct sk_buff *skb = *skb_p;
230
231 switch (skb->protocol) {
232 case __constant_ntohs(NLPID_CCITT_ANSI_LMI):
233 head_len = 4;
234 skb_push(skb, head_len);
235 skb->data[3] = NLPID_CCITT_ANSI_LMI;
236 break;
237
238 case __constant_ntohs(NLPID_CISCO_LMI):
239 head_len = 4;
240 skb_push(skb, head_len);
241 skb->data[3] = NLPID_CISCO_LMI;
242 break;
243
244 case __constant_ntohs(ETH_P_IP):
245 head_len = 4;
246 skb_push(skb, head_len);
247 skb->data[3] = NLPID_IP;
248 break;
249
250 case __constant_ntohs(ETH_P_IPV6):
251 head_len = 4;
252 skb_push(skb, head_len);
253 skb->data[3] = NLPID_IPV6;
254 break;
255
256 case __constant_ntohs(ETH_P_802_3):
257 head_len = 10;
258 if (skb_headroom(skb) < head_len) {
259 struct sk_buff *skb2 = skb_realloc_headroom(skb,
260 head_len);
261 if (!skb2)
262 return -ENOBUFS;
263 dev_kfree_skb(skb);
264 skb = *skb_p = skb2;
265 }
266 skb_push(skb, head_len);
267 skb->data[3] = FR_PAD;
268 skb->data[4] = NLPID_SNAP;
269 skb->data[5] = FR_PAD;
270 skb->data[6] = 0x80;
271 skb->data[7] = 0xC2;
272 skb->data[8] = 0x00;
273 skb->data[9] = 0x07; /* bridged Ethernet frame w/out FCS */
274 break;
275
276 default:
277 head_len = 10;
278 skb_push(skb, head_len);
279 skb->data[3] = FR_PAD;
280 skb->data[4] = NLPID_SNAP;
281 skb->data[5] = FR_PAD;
282 skb->data[6] = FR_PAD;
283 skb->data[7] = FR_PAD;
284 *(u16*)(skb->data + 8) = skb->protocol;
285 }
286
287 dlci_to_q922(skb->data, dlci);
288 skb->data[2] = FR_UI;
289 return 0;
290 }
291
292
293
294 static int pvc_open(struct net_device *dev)
295 {
296 pvc_device *pvc = dev_to_pvc(dev);
297
298 if ((pvc->master->flags & IFF_UP) == 0)
299 return -EIO; /* Master must be UP in order to activate PVC */
300
301 if (pvc->open_count++ == 0) {
302 hdlc_device *hdlc = dev_to_hdlc(pvc->master);
303 if (hdlc->state.fr.settings.lmi == LMI_NONE)
304 pvc->state.active = netif_carrier_ok(pvc->master);
305
306 pvc_carrier(pvc->state.active, pvc);
307 hdlc->state.fr.dce_changed = 1;
308 }
309 return 0;
310 }
311
312
313
314 static int pvc_close(struct net_device *dev)
315 {
316 pvc_device *pvc = dev_to_pvc(dev);
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 = 0;
322
323 if (hdlc->state.fr.settings.dce) {
324 hdlc->state.fr.dce_changed = 1;
325 pvc->state.active = 0;
326 }
327 }
328 return 0;
329 }
330
331
332
333 static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
334 {
335 pvc_device *pvc = dev_to_pvc(dev);
336 fr_proto_pvc_info info;
337
338 if (ifr->ifr_settings.type == IF_GET_PROTO) {
339 if (dev->type == ARPHRD_ETHER)
340 ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
341 else
342 ifr->ifr_settings.type = IF_PROTO_FR_PVC;
343
344 if (ifr->ifr_settings.size < sizeof(info)) {
345 /* data size wanted */
346 ifr->ifr_settings.size = sizeof(info);
347 return -ENOBUFS;
348 }
349
350 info.dlci = pvc->dlci;
351 memcpy(info.master, pvc->master->name, IFNAMSIZ);
352 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
353 &info, sizeof(info)))
354 return -EFAULT;
355 return 0;
356 }
357
358 return -EINVAL;
359 }
360
361
362 static inline struct net_device_stats *pvc_get_stats(struct net_device *dev)
363 {
364 return netdev_priv(dev);
365 }
366
367
368
369 static int pvc_xmit(struct sk_buff *skb, struct net_device *dev)
370 {
371 pvc_device *pvc = dev_to_pvc(dev);
372 struct net_device_stats *stats = pvc_get_stats(dev);
373
374 if (pvc->state.active) {
375 if (dev->type == ARPHRD_ETHER) {
376 int pad = ETH_ZLEN - skb->len;
377 if (pad > 0) { /* Pad the frame with zeros */
378 int len = skb->len;
379 if (skb_tailroom(skb) < pad)
380 if (pskb_expand_head(skb, 0, pad,
381 GFP_ATOMIC)) {
382 stats->tx_dropped++;
383 dev_kfree_skb(skb);
384 return 0;
385 }
386 skb_put(skb, pad);
387 memset(skb->data + len, 0, pad);
388 }
389 skb->protocol = __constant_htons(ETH_P_802_3);
390 }
391 if (!fr_hard_header(&skb, pvc->dlci)) {
392 stats->tx_bytes += skb->len;
393 stats->tx_packets++;
394 if (pvc->state.fecn) /* TX Congestion counter */
395 stats->tx_compressed++;
396 skb->dev = pvc->master;
397 dev_queue_xmit(skb);
398 return 0;
399 }
400 }
401
402 stats->tx_dropped++;
403 dev_kfree_skb(skb);
404 return 0;
405 }
406
407
408
409 static int pvc_change_mtu(struct net_device *dev, int new_mtu)
410 {
411 if ((new_mtu < 68) || (new_mtu > HDLC_MAX_MTU))
412 return -EINVAL;
413 dev->mtu = new_mtu;
414 return 0;
415 }
416
417
418
419 static inline void fr_log_dlci_active(pvc_device *pvc)
420 {
421 printk(KERN_INFO "%s: DLCI %d [%s%s%s]%s %s\n",
422 pvc->master->name,
423 pvc->dlci,
424 pvc->main ? pvc->main->name : "",
425 pvc->main && pvc->ether ? " " : "",
426 pvc->ether ? pvc->ether->name : "",
427 pvc->state.new ? " new" : "",
428 !pvc->state.exist ? "deleted" :
429 pvc->state.active ? "active" : "inactive");
430 }
431
432
433
434 static inline u8 fr_lmi_nextseq(u8 x)
435 {
436 x++;
437 return x ? x : 1;
438 }
439
440
441
442 static void fr_lmi_send(struct net_device *dev, int fullrep)
443 {
444 hdlc_device *hdlc = dev_to_hdlc(dev);
445 struct sk_buff *skb;
446 pvc_device *pvc = hdlc->state.fr.first_pvc;
447 int lmi = hdlc->state.fr.settings.lmi;
448 int dce = hdlc->state.fr.settings.dce;
449 int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
450 int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
451 u8 *data;
452 int i = 0;
453
454 if (dce && fullrep) {
455 len += hdlc->state.fr.dce_pvc_count * (2 + stat_len);
456 if (len > HDLC_MAX_MRU) {
457 printk(KERN_WARNING "%s: Too many PVCs while sending "
458 "LMI full report\n", dev->name);
459 return;
460 }
461 }
462
463 skb = dev_alloc_skb(len);
464 if (!skb) {
465 printk(KERN_WARNING "%s: Memory squeeze on fr_lmi_send()\n",
466 dev->name);
467 return;
468 }
469 memset(skb->data, 0, len);
470 skb_reserve(skb, 4);
471 if (lmi == LMI_CISCO) {
472 skb->protocol = __constant_htons(NLPID_CISCO_LMI);
473 fr_hard_header(&skb, LMI_CISCO_DLCI);
474 } else {
475 skb->protocol = __constant_htons(NLPID_CCITT_ANSI_LMI);
476 fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI);
477 }
478 data = skb->tail;
479 data[i++] = LMI_CALLREF;
480 data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
481 if (lmi == LMI_ANSI)
482 data[i++] = LMI_ANSI_LOCKSHIFT;
483 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
484 LMI_ANSI_CISCO_REPTYPE;
485 data[i++] = LMI_REPT_LEN;
486 data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
487 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
488 data[i++] = LMI_INTEG_LEN;
489 data[i++] = hdlc->state.fr.txseq =fr_lmi_nextseq(hdlc->state.fr.txseq);
490 data[i++] = hdlc->state.fr.rxseq;
491
492 if (dce && fullrep) {
493 while (pvc) {
494 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
495 LMI_ANSI_CISCO_PVCSTAT;
496 data[i++] = stat_len;
497
498 /* LMI start/restart */
499 if (hdlc->state.fr.reliable && !pvc->state.exist) {
500 pvc->state.exist = pvc->state.new = 1;
501 fr_log_dlci_active(pvc);
502 }
503
504 /* ifconfig PVC up */
505 if (pvc->open_count && !pvc->state.active &&
506 pvc->state.exist && !pvc->state.new) {
507 pvc_carrier(1, pvc);
508 pvc->state.active = 1;
509 fr_log_dlci_active(pvc);
510 }
511
512 if (lmi == LMI_CISCO) {
513 data[i] = pvc->dlci >> 8;
514 data[i + 1] = pvc->dlci & 0xFF;
515 } else {
516 data[i] = (pvc->dlci >> 4) & 0x3F;
517 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
518 data[i + 2] = 0x80;
519 }
520
521 if (pvc->state.new)
522 data[i + 2] |= 0x08;
523 else if (pvc->state.active)
524 data[i + 2] |= 0x02;
525
526 i += stat_len;
527 pvc = pvc->next;
528 }
529 }
530
531 skb_put(skb, i);
532 skb->priority = TC_PRIO_CONTROL;
533 skb->dev = dev;
534 skb->nh.raw = skb->data;
535
536 dev_queue_xmit(skb);
537 }
538
539
540
541 static void fr_set_link_state(int reliable, struct net_device *dev)
542 {
543 hdlc_device *hdlc = dev_to_hdlc(dev);
544 pvc_device *pvc = hdlc->state.fr.first_pvc;
545
546 hdlc->state.fr.reliable = reliable;
547 if (reliable) {
548 netif_dormant_off(dev);
549 hdlc->state.fr.n391cnt = 0; /* Request full status */
550 hdlc->state.fr.dce_changed = 1;
551
552 if (hdlc->state.fr.settings.lmi == LMI_NONE) {
553 while (pvc) { /* Activate all PVCs */
554 pvc_carrier(1, pvc);
555 pvc->state.exist = pvc->state.active = 1;
556 pvc->state.new = 0;
557 pvc = pvc->next;
558 }
559 }
560 } else {
561 netif_dormant_on(dev);
562 while (pvc) { /* Deactivate all PVCs */
563 pvc_carrier(0, pvc);
564 pvc->state.exist = pvc->state.active = 0;
565 pvc->state.new = 0;
566 if (!hdlc->state.fr.settings.dce)
567 pvc->state.bandwidth = 0;
568 pvc = pvc->next;
569 }
570 }
571 }
572
573
574
575 static void fr_timer(unsigned long arg)
576 {
577 struct net_device *dev = (struct net_device *)arg;
578 hdlc_device *hdlc = dev_to_hdlc(dev);
579 int i, cnt = 0, reliable;
580 u32 list;
581
582 if (hdlc->state.fr.settings.dce) {
583 reliable = hdlc->state.fr.request &&
584 time_before(jiffies, hdlc->state.fr.last_poll +
585 hdlc->state.fr.settings.t392 * HZ);
586 hdlc->state.fr.request = 0;
587 } else {
588 hdlc->state.fr.last_errors <<= 1; /* Shift the list */
589 if (hdlc->state.fr.request) {
590 if (hdlc->state.fr.reliable)
591 printk(KERN_INFO "%s: No LMI status reply "
592 "received\n", dev->name);
593 hdlc->state.fr.last_errors |= 1;
594 }
595
596 list = hdlc->state.fr.last_errors;
597 for (i = 0; i < hdlc->state.fr.settings.n393; i++, list >>= 1)
598 cnt += (list & 1); /* errors count */
599
600 reliable = (cnt < hdlc->state.fr.settings.n392);
601 }
602
603 if (hdlc->state.fr.reliable != reliable) {
604 printk(KERN_INFO "%s: Link %sreliable\n", dev->name,
605 reliable ? "" : "un");
606 fr_set_link_state(reliable, dev);
607 }
608
609 if (hdlc->state.fr.settings.dce)
610 hdlc->state.fr.timer.expires = jiffies +
611 hdlc->state.fr.settings.t392 * HZ;
612 else {
613 if (hdlc->state.fr.n391cnt)
614 hdlc->state.fr.n391cnt--;
615
616 fr_lmi_send(dev, hdlc->state.fr.n391cnt == 0);
617
618 hdlc->state.fr.last_poll = jiffies;
619 hdlc->state.fr.request = 1;
620 hdlc->state.fr.timer.expires = jiffies +
621 hdlc->state.fr.settings.t391 * HZ;
622 }
623
624 hdlc->state.fr.timer.function = fr_timer;
625 hdlc->state.fr.timer.data = arg;
626 add_timer(&hdlc->state.fr.timer);
627 }
628
629
630
631 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
632 {
633 hdlc_device *hdlc = dev_to_hdlc(dev);
634 pvc_device *pvc;
635 u8 rxseq, txseq;
636 int lmi = hdlc->state.fr.settings.lmi;
637 int dce = hdlc->state.fr.settings.dce;
638 int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;
639
640 if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
641 LMI_CCITT_CISCO_LENGTH)) {
642 printk(KERN_INFO "%s: Short LMI frame\n", dev->name);
643 return 1;
644 }
645
646 if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
647 NLPID_CCITT_ANSI_LMI)) {
648 printk(KERN_INFO "%s: Received non-LMI frame with LMI"
649 " DLCI\n", dev->name);
650 return 1;
651 }
652
653 if (skb->data[4] != LMI_CALLREF) {
654 printk(KERN_INFO "%s: Invalid LMI Call reference (0x%02X)\n",
655 dev->name, skb->data[4]);
656 return 1;
657 }
658
659 if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
660 printk(KERN_INFO "%s: Invalid LMI Message type (0x%02X)\n",
661 dev->name, skb->data[5]);
662 return 1;
663 }
664
665 if (lmi == LMI_ANSI) {
666 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
667 printk(KERN_INFO "%s: Not ANSI locking shift in LMI"
668 " message (0x%02X)\n", dev->name, skb->data[6]);
669 return 1;
670 }
671 i = 7;
672 } else
673 i = 6;
674
675 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
676 LMI_ANSI_CISCO_REPTYPE)) {
677 printk(KERN_INFO "%s: Not an LMI Report type IE (0x%02X)\n",
678 dev->name, skb->data[i]);
679 return 1;
680 }
681
682 if (skb->data[++i] != LMI_REPT_LEN) {
683 printk(KERN_INFO "%s: Invalid LMI Report type IE length"
684 " (%u)\n", dev->name, skb->data[i]);
685 return 1;
686 }
687
688 reptype = skb->data[++i];
689 if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
690 printk(KERN_INFO "%s: Unsupported LMI Report type (0x%02X)\n",
691 dev->name, reptype);
692 return 1;
693 }
694
695 if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
696 LMI_ANSI_CISCO_ALIVE)) {
697 printk(KERN_INFO "%s: Not an LMI Link integrity verification"
698 " IE (0x%02X)\n", dev->name, skb->data[i]);
699 return 1;
700 }
701
702 if (skb->data[++i] != LMI_INTEG_LEN) {
703 printk(KERN_INFO "%s: Invalid LMI Link integrity verification"
704 " IE length (%u)\n", dev->name, skb->data[i]);
705 return 1;
706 }
707 i++;
708
709 hdlc->state.fr.rxseq = skb->data[i++]; /* TX sequence from peer */
710 rxseq = skb->data[i++]; /* Should confirm our sequence */
711
712 txseq = hdlc->state.fr.txseq;
713
714 if (dce)
715 hdlc->state.fr.last_poll = jiffies;
716
717 error = 0;
718 if (!hdlc->state.fr.reliable)
719 error = 1;
720
721 if (rxseq == 0 || rxseq != txseq) {
722 hdlc->state.fr.n391cnt = 0; /* Ask for full report next time */
723 error = 1;
724 }
725
726 if (dce) {
727 if (hdlc->state.fr.fullrep_sent && !error) {
728 /* Stop sending full report - the last one has been confirmed by DTE */
729 hdlc->state.fr.fullrep_sent = 0;
730 pvc = hdlc->state.fr.first_pvc;
731 while (pvc) {
732 if (pvc->state.new) {
733 pvc->state.new = 0;
734
735 /* Tell DTE that new PVC is now active */
736 hdlc->state.fr.dce_changed = 1;
737 }
738 pvc = pvc->next;
739 }
740 }
741
742 if (hdlc->state.fr.dce_changed) {
743 reptype = LMI_FULLREP;
744 hdlc->state.fr.fullrep_sent = 1;
745 hdlc->state.fr.dce_changed = 0;
746 }
747
748 hdlc->state.fr.request = 1; /* got request */
749 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
750 return 0;
751 }
752
753 /* DTE */
754
755 hdlc->state.fr.request = 0; /* got response, no request pending */
756
757 if (error)
758 return 0;
759
760 if (reptype != LMI_FULLREP)
761 return 0;
762
763 pvc = hdlc->state.fr.first_pvc;
764
765 while (pvc) {
766 pvc->state.deleted = 1;
767 pvc = pvc->next;
768 }
769
770 no_ram = 0;
771 while (skb->len >= i + 2 + stat_len) {
772 u16 dlci;
773 u32 bw;
774 unsigned int active, new;
775
776 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
777 LMI_ANSI_CISCO_PVCSTAT)) {
778 printk(KERN_INFO "%s: Not an LMI PVC status IE"
779 " (0x%02X)\n", dev->name, skb->data[i]);
780 return 1;
781 }
782
783 if (skb->data[++i] != stat_len) {
784 printk(KERN_INFO "%s: Invalid LMI PVC status IE length"
785 " (%u)\n", dev->name, skb->data[i]);
786 return 1;
787 }
788 i++;
789
790 new = !! (skb->data[i + 2] & 0x08);
791 active = !! (skb->data[i + 2] & 0x02);
792 if (lmi == LMI_CISCO) {
793 dlci = (skb->data[i] << 8) | skb->data[i + 1];
794 bw = (skb->data[i + 3] << 16) |
795 (skb->data[i + 4] << 8) |
796 (skb->data[i + 5]);
797 } else {
798 dlci = ((skb->data[i] & 0x3F) << 4) |
799 ((skb->data[i + 1] & 0x78) >> 3);
800 bw = 0;
801 }
802
803 pvc = add_pvc(dev, dlci);
804
805 if (!pvc && !no_ram) {
806 printk(KERN_WARNING
807 "%s: Memory squeeze on fr_lmi_recv()\n",
808 dev->name);
809 no_ram = 1;
810 }
811
812 if (pvc) {
813 pvc->state.exist = 1;
814 pvc->state.deleted = 0;
815 if (active != pvc->state.active ||
816 new != pvc->state.new ||
817 bw != pvc->state.bandwidth ||
818 !pvc->state.exist) {
819 pvc->state.new = new;
820 pvc->state.active = active;
821 pvc->state.bandwidth = bw;
822 pvc_carrier(active, pvc);
823 fr_log_dlci_active(pvc);
824 }
825 }
826
827 i += stat_len;
828 }
829
830 pvc = hdlc->state.fr.first_pvc;
831
832 while (pvc) {
833 if (pvc->state.deleted && pvc->state.exist) {
834 pvc_carrier(0, pvc);
835 pvc->state.active = pvc->state.new = 0;
836 pvc->state.exist = 0;
837 pvc->state.bandwidth = 0;
838 fr_log_dlci_active(pvc);
839 }
840 pvc = pvc->next;
841 }
842
843 /* Next full report after N391 polls */
844 hdlc->state.fr.n391cnt = hdlc->state.fr.settings.n391;
845
846 return 0;
847 }
848
849
850
851 static int fr_rx(struct sk_buff *skb)
852 {
853 struct net_device *ndev = skb->dev;
854 hdlc_device *hdlc = dev_to_hdlc(ndev);
855 fr_hdr *fh = (fr_hdr*)skb->data;
856 u8 *data = skb->data;
857 u16 dlci;
858 pvc_device *pvc;
859 struct net_device *dev = NULL;
860
861 if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
862 goto rx_error;
863
864 dlci = q922_to_dlci(skb->data);
865
866 if ((dlci == LMI_CCITT_ANSI_DLCI &&
867 (hdlc->state.fr.settings.lmi == LMI_ANSI ||
868 hdlc->state.fr.settings.lmi == LMI_CCITT)) ||
869 (dlci == LMI_CISCO_DLCI &&
870 hdlc->state.fr.settings.lmi == LMI_CISCO)) {
871 if (fr_lmi_recv(ndev, skb))
872 goto rx_error;
873 dev_kfree_skb_any(skb);
874 return NET_RX_SUCCESS;
875 }
876
877 pvc = find_pvc(hdlc, dlci);
878 if (!pvc) {
879 #ifdef DEBUG_PKT
880 printk(KERN_INFO "%s: No PVC for received frame's DLCI %d\n",
881 ndev->name, dlci);
882 #endif
883 dev_kfree_skb_any(skb);
884 return NET_RX_DROP;
885 }
886
887 if (pvc->state.fecn != fh->fecn) {
888 #ifdef DEBUG_ECN
889 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", ndev->name,
890 dlci, fh->fecn ? "N" : "FF");
891 #endif
892 pvc->state.fecn ^= 1;
893 }
894
895 if (pvc->state.becn != fh->becn) {
896 #ifdef DEBUG_ECN
897 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", ndev->name,
898 dlci, fh->becn ? "N" : "FF");
899 #endif
900 pvc->state.becn ^= 1;
901 }
902
903
904 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
905 hdlc->stats.rx_dropped++;
906 return NET_RX_DROP;
907 }
908
909 if (data[3] == NLPID_IP) {
910 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
911 dev = pvc->main;
912 skb->protocol = htons(ETH_P_IP);
913
914 } else if (data[3] == NLPID_IPV6) {
915 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
916 dev = pvc->main;
917 skb->protocol = htons(ETH_P_IPV6);
918
919 } else if (skb->len > 10 && data[3] == FR_PAD &&
920 data[4] == NLPID_SNAP && data[5] == FR_PAD) {
921 u16 oui = ntohs(*(u16*)(data + 6));
922 u16 pid = ntohs(*(u16*)(data + 8));
923 skb_pull(skb, 10);
924
925 switch ((((u32)oui) << 16) | pid) {
926 case ETH_P_ARP: /* routed frame with SNAP */
927 case ETH_P_IPX:
928 case ETH_P_IP: /* a long variant */
929 case ETH_P_IPV6:
930 dev = pvc->main;
931 skb->protocol = htons(pid);
932 break;
933
934 case 0x80C20007: /* bridged Ethernet frame */
935 if ((dev = pvc->ether) != NULL)
936 skb->protocol = eth_type_trans(skb, dev);
937 break;
938
939 default:
940 printk(KERN_INFO "%s: Unsupported protocol, OUI=%x "
941 "PID=%x\n", ndev->name, oui, pid);
942 dev_kfree_skb_any(skb);
943 return NET_RX_DROP;
944 }
945 } else {
946 printk(KERN_INFO "%s: Unsupported protocol, NLPID=%x "
947 "length = %i\n", ndev->name, data[3], skb->len);
948 dev_kfree_skb_any(skb);
949 return NET_RX_DROP;
950 }
951
952 if (dev) {
953 struct net_device_stats *stats = pvc_get_stats(dev);
954 stats->rx_packets++; /* PVC traffic */
955 stats->rx_bytes += skb->len;
956 if (pvc->state.becn)
957 stats->rx_compressed++;
958 skb->dev = dev;
959 netif_rx(skb);
960 return NET_RX_SUCCESS;
961 } else {
962 dev_kfree_skb_any(skb);
963 return NET_RX_DROP;
964 }
965
966 rx_error:
967 hdlc->stats.rx_errors++; /* Mark error */
968 dev_kfree_skb_any(skb);
969 return NET_RX_DROP;
970 }
971
972
973
974 static void fr_start(struct net_device *dev)
975 {
976 hdlc_device *hdlc = dev_to_hdlc(dev);
977 #ifdef DEBUG_LINK
978 printk(KERN_DEBUG "fr_start\n");
979 #endif
980 if (hdlc->state.fr.settings.lmi != LMI_NONE) {
981 hdlc->state.fr.reliable = 0;
982 hdlc->state.fr.dce_changed = 1;
983 hdlc->state.fr.request = 0;
984 hdlc->state.fr.fullrep_sent = 0;
985 hdlc->state.fr.last_errors = 0xFFFFFFFF;
986 hdlc->state.fr.n391cnt = 0;
987 hdlc->state.fr.txseq = hdlc->state.fr.rxseq = 0;
988
989 init_timer(&hdlc->state.fr.timer);
990 /* First poll after 1 s */
991 hdlc->state.fr.timer.expires = jiffies + HZ;
992 hdlc->state.fr.timer.function = fr_timer;
993 hdlc->state.fr.timer.data = (unsigned long)dev;
994 add_timer(&hdlc->state.fr.timer);
995 } else
996 fr_set_link_state(1, dev);
997 }
998
999
1000
1001 static void fr_stop(struct net_device *dev)
1002 {
1003 hdlc_device *hdlc = dev_to_hdlc(dev);
1004 #ifdef DEBUG_LINK
1005 printk(KERN_DEBUG "fr_stop\n");
1006 #endif
1007 if (hdlc->state.fr.settings.lmi != LMI_NONE)
1008 del_timer_sync(&hdlc->state.fr.timer);
1009 fr_set_link_state(0, dev);
1010 }
1011
1012
1013
1014 static void fr_close(struct net_device *dev)
1015 {
1016 hdlc_device *hdlc = dev_to_hdlc(dev);
1017 pvc_device *pvc = hdlc->state.fr.first_pvc;
1018
1019 while (pvc) { /* Shutdown all PVCs for this FRAD */
1020 if (pvc->main)
1021 dev_close(pvc->main);
1022 if (pvc->ether)
1023 dev_close(pvc->ether);
1024 pvc = pvc->next;
1025 }
1026 }
1027
1028 static void dlci_setup(struct net_device *dev)
1029 {
1030 dev->type = ARPHRD_DLCI;
1031 dev->flags = IFF_POINTOPOINT;
1032 dev->hard_header_len = 10;
1033 dev->addr_len = 2;
1034 }
1035
1036 static int fr_add_pvc(struct net_device *master, unsigned int dlci, int type)
1037 {
1038 hdlc_device *hdlc = dev_to_hdlc(master);
1039 pvc_device *pvc = NULL;
1040 struct net_device *dev;
1041 int result, used;
1042 char * prefix = "pvc%d";
1043
1044 if (type == ARPHRD_ETHER)
1045 prefix = "pvceth%d";
1046
1047 if ((pvc = add_pvc(master, dlci)) == NULL) {
1048 printk(KERN_WARNING "%s: Memory squeeze on fr_add_pvc()\n",
1049 master->name);
1050 return -ENOBUFS;
1051 }
1052
1053 if (*get_dev_p(pvc, type))
1054 return -EEXIST;
1055
1056 used = pvc_is_used(pvc);
1057
1058 if (type == ARPHRD_ETHER)
1059 dev = alloc_netdev(sizeof(struct net_device_stats),
1060 "pvceth%d", ether_setup);
1061 else
1062 dev = alloc_netdev(sizeof(struct net_device_stats),
1063 "pvc%d", dlci_setup);
1064
1065 if (!dev) {
1066 printk(KERN_WARNING "%s: Memory squeeze on fr_pvc()\n",
1067 master->name);
1068 delete_unused_pvcs(hdlc);
1069 return -ENOBUFS;
1070 }
1071
1072 if (type == ARPHRD_ETHER) {
1073 memcpy(dev->dev_addr, "\x00\x01", 2);
1074 get_random_bytes(dev->dev_addr + 2, ETH_ALEN - 2);
1075 } else {
1076 *(u16*)dev->dev_addr = htons(dlci);
1077 dlci_to_q922(dev->broadcast, dlci);
1078 }
1079 dev->hard_start_xmit = pvc_xmit;
1080 dev->get_stats = pvc_get_stats;
1081 dev->open = pvc_open;
1082 dev->stop = pvc_close;
1083 dev->do_ioctl = pvc_ioctl;
1084 dev->change_mtu = pvc_change_mtu;
1085 dev->mtu = HDLC_MAX_MTU;
1086 dev->tx_queue_len = 0;
1087 dev->priv = pvc;
1088
1089 result = dev_alloc_name(dev, dev->name);
1090 if (result < 0) {
1091 free_netdev(dev);
1092 delete_unused_pvcs(hdlc);
1093 return result;
1094 }
1095
1096 if (register_netdevice(dev) != 0) {
1097 free_netdev(dev);
1098 delete_unused_pvcs(hdlc);
1099 return -EIO;
1100 }
1101
1102 dev->destructor = free_netdev;
1103 *get_dev_p(pvc, type) = dev;
1104 if (!used) {
1105 hdlc->state.fr.dce_changed = 1;
1106 hdlc->state.fr.dce_pvc_count++;
1107 }
1108 return 0;
1109 }
1110
1111
1112
1113 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
1114 {
1115 pvc_device *pvc;
1116 struct net_device *dev;
1117
1118 if ((pvc = find_pvc(hdlc, dlci)) == NULL)
1119 return -ENOENT;
1120
1121 if ((dev = *get_dev_p(pvc, type)) == NULL)
1122 return -ENOENT;
1123
1124 if (dev->flags & IFF_UP)
1125 return -EBUSY; /* PVC in use */
1126
1127 unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
1128 *get_dev_p(pvc, type) = NULL;
1129
1130 if (!pvc_is_used(pvc)) {
1131 hdlc->state.fr.dce_pvc_count--;
1132 hdlc->state.fr.dce_changed = 1;
1133 }
1134 delete_unused_pvcs(hdlc);
1135 return 0;
1136 }
1137
1138
1139
1140 static void fr_destroy(hdlc_device *hdlc)
1141 {
1142 pvc_device *pvc;
1143
1144 pvc = hdlc->state.fr.first_pvc;
1145 hdlc->state.fr.first_pvc = NULL; /* All PVCs destroyed */
1146 hdlc->state.fr.dce_pvc_count = 0;
1147 hdlc->state.fr.dce_changed = 1;
1148
1149 while (pvc) {
1150 pvc_device *next = pvc->next;
1151 /* destructors will free_netdev() main and ether */
1152 if (pvc->main)
1153 unregister_netdevice(pvc->main);
1154
1155 if (pvc->ether)
1156 unregister_netdevice(pvc->ether);
1157
1158 kfree(pvc);
1159 pvc = next;
1160 }
1161 }
1162
1163
1164
1165 int hdlc_fr_ioctl(struct net_device *dev, struct ifreq *ifr)
1166 {
1167 fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
1168 const size_t size = sizeof(fr_proto);
1169 fr_proto new_settings;
1170 hdlc_device *hdlc = dev_to_hdlc(dev);
1171 fr_proto_pvc pvc;
1172 int result;
1173
1174 switch (ifr->ifr_settings.type) {
1175 case IF_GET_PROTO:
1176 ifr->ifr_settings.type = IF_PROTO_FR;
1177 if (ifr->ifr_settings.size < size) {
1178 ifr->ifr_settings.size = size; /* data size wanted */
1179 return -ENOBUFS;
1180 }
1181 if (copy_to_user(fr_s, &hdlc->state.fr.settings, size))
1182 return -EFAULT;
1183 return 0;
1184
1185 case IF_PROTO_FR:
1186 if(!capable(CAP_NET_ADMIN))
1187 return -EPERM;
1188
1189 if(dev->flags & IFF_UP)
1190 return -EBUSY;
1191
1192 if (copy_from_user(&new_settings, fr_s, size))
1193 return -EFAULT;
1194
1195 if (new_settings.lmi == LMI_DEFAULT)
1196 new_settings.lmi = LMI_ANSI;
1197
1198 if ((new_settings.lmi != LMI_NONE &&
1199 new_settings.lmi != LMI_ANSI &&
1200 new_settings.lmi != LMI_CCITT &&
1201 new_settings.lmi != LMI_CISCO) ||
1202 new_settings.t391 < 1 ||
1203 new_settings.t392 < 2 ||
1204 new_settings.n391 < 1 ||
1205 new_settings.n392 < 1 ||
1206 new_settings.n393 < new_settings.n392 ||
1207 new_settings.n393 > 32 ||
1208 (new_settings.dce != 0 &&
1209 new_settings.dce != 1))
1210 return -EINVAL;
1211
1212 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1213 if (result)
1214 return result;
1215
1216 if (hdlc->proto.id != IF_PROTO_FR) {
1217 hdlc_proto_detach(hdlc);
1218 hdlc->state.fr.first_pvc = NULL;
1219 hdlc->state.fr.dce_pvc_count = 0;
1220 }
1221 memcpy(&hdlc->state.fr.settings, &new_settings, size);
1222 memset(&hdlc->proto, 0, sizeof(hdlc->proto));
1223
1224 hdlc->proto.close = fr_close;
1225 hdlc->proto.start = fr_start;
1226 hdlc->proto.stop = fr_stop;
1227 hdlc->proto.detach = fr_destroy;
1228 hdlc->proto.netif_rx = fr_rx;
1229 hdlc->proto.id = IF_PROTO_FR;
1230 dev->hard_start_xmit = hdlc->xmit;
1231 dev->hard_header = NULL;
1232 dev->type = ARPHRD_FRAD;
1233 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1234 dev->addr_len = 0;
1235 return 0;
1236
1237 case IF_PROTO_FR_ADD_PVC:
1238 case IF_PROTO_FR_DEL_PVC:
1239 case IF_PROTO_FR_ADD_ETH_PVC:
1240 case IF_PROTO_FR_DEL_ETH_PVC:
1241 if(!capable(CAP_NET_ADMIN))
1242 return -EPERM;
1243
1244 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
1245 sizeof(fr_proto_pvc)))
1246 return -EFAULT;
1247
1248 if (pvc.dlci <= 0 || pvc.dlci >= 1024)
1249 return -EINVAL; /* Only 10 bits, DLCI 0 reserved */
1250
1251 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
1252 ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
1253 result = ARPHRD_ETHER; /* bridged Ethernet device */
1254 else
1255 result = ARPHRD_DLCI;
1256
1257 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
1258 ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
1259 return fr_add_pvc(dev, pvc.dlci, result);
1260 else
1261 return fr_del_pvc(hdlc, pvc.dlci, result);
1262 }
1263
1264 return -EINVAL;
1265 }
Linux kernel - Deliverables
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