projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Generic HDLC - remove now unneeded hdlc_device_desc
[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 - 2006 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 #undef DEBUG_PROTO
56 #undef DEBUG_PVC
57
58 #define FR_UI 0x03
59 #define FR_PAD 0x00
60
61 #define NLPID_IP 0xCC
62 #define NLPID_IPV6 0x8E
63 #define NLPID_SNAP 0x80
64 #define NLPID_PAD 0x00
65 #define NLPID_CCITT_ANSI_LMI 0x08
66 #define NLPID_CISCO_LMI 0x09
67
68
69 #define LMI_CCITT_ANSI_DLCI 0 /* LMI DLCI */
70 #define LMI_CISCO_DLCI 1023
71
72 #define LMI_CALLREF 0x00 /* Call Reference */
73 #define LMI_ANSI_LOCKSHIFT 0x95 /* ANSI locking shift */
74 #define LMI_ANSI_CISCO_REPTYPE 0x01 /* report type */
75 #define LMI_CCITT_REPTYPE 0x51
76 #define LMI_ANSI_CISCO_ALIVE 0x03 /* keep alive */
77 #define LMI_CCITT_ALIVE 0x53
78 #define LMI_ANSI_CISCO_PVCSTAT 0x07 /* PVC status */
79 #define LMI_CCITT_PVCSTAT 0x57
80
81 #define LMI_FULLREP 0x00 /* full report */
82 #define LMI_INTEGRITY 0x01 /* link integrity report */
83 #define LMI_SINGLE 0x02 /* single PVC report */
84
85 #define LMI_STATUS_ENQUIRY 0x75
86 #define LMI_STATUS 0x7D /* reply */
87
88 #define LMI_REPT_LEN 1 /* report type element length */
89 #define LMI_INTEG_LEN 2 /* link integrity element length */
90
91 #define LMI_CCITT_CISCO_LENGTH 13 /* LMI frame lengths */
92 #define LMI_ANSI_LENGTH 14
93
94
95 typedef struct {
96 #if defined(__LITTLE_ENDIAN_BITFIELD)
97 unsigned ea1: 1;
98 unsigned cr: 1;
99 unsigned dlcih: 6;
100
101 unsigned ea2: 1;
102 unsigned de: 1;
103 unsigned becn: 1;
104 unsigned fecn: 1;
105 unsigned dlcil: 4;
106 #else
107 unsigned dlcih: 6;
108 unsigned cr: 1;
109 unsigned ea1: 1;
110
111 unsigned dlcil: 4;
112 unsigned fecn: 1;
113 unsigned becn: 1;
114 unsigned de: 1;
115 unsigned ea2: 1;
116 #endif
117 }__attribute__ ((packed)) fr_hdr;
118
119
120 typedef struct pvc_device_struct {
121 struct net_device *frad;
122 struct net_device *main;
123 struct net_device *ether; /* bridged Ethernet interface */
124 struct pvc_device_struct *next; /* Sorted in ascending DLCI order */
125 int dlci;
126 int open_count;
127
128 struct {
129 unsigned int new: 1;
130 unsigned int active: 1;
131 unsigned int exist: 1;
132 unsigned int deleted: 1;
133 unsigned int fecn: 1;
134 unsigned int becn: 1;
135 unsigned int bandwidth; /* Cisco LMI reporting only */
136 }state;
137 }pvc_device;
138
139 struct pvc_desc {
140 struct net_device_stats stats;
141 pvc_device *pvc;
142 };
143
144 struct frad_state {
145 fr_proto settings;
146 pvc_device *first_pvc;
147 int dce_pvc_count;
148
149 struct timer_list timer;
150 unsigned long last_poll;
151 int reliable;
152 int dce_changed;
153 int request;
154 int fullrep_sent;
155 u32 last_errors; /* last errors bit list */
156 u8 n391cnt;
157 u8 txseq; /* TX sequence number */
158 u8 rxseq; /* RX sequence number */
159 };
160
161
162 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr);
163
164
165 static inline u16 q922_to_dlci(u8 *hdr)
166 {
167 return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
168 }
169
170
171 static inline void dlci_to_q922(u8 *hdr, u16 dlci)
172 {
173 hdr[0] = (dlci >> 2) & 0xFC;
174 hdr[1] = ((dlci << 4) & 0xF0) | 0x01;
175 }
176
177
178 static inline struct frad_state* state(hdlc_device *hdlc)
179 {
180 return(struct frad_state *)(hdlc->state);
181 }
182
183 static inline struct pvc_desc* pvcdev_to_desc(struct net_device *dev)
184 {
185 return dev->priv;
186 }
187
188 static inline struct net_device_stats* pvc_get_stats(struct net_device *dev)
189 {
190 return &pvcdev_to_desc(dev)->stats;
191 }
192
193 static inline pvc_device* find_pvc(hdlc_device *hdlc, u16 dlci)
194 {
195 pvc_device *pvc = state(hdlc)->first_pvc;
196
197 while (pvc) {
198 if (pvc->dlci == dlci)
199 return pvc;
200 if (pvc->dlci > dlci)
201 return NULL; /* the listed is sorted */
202 pvc = pvc->next;
203 }
204
205 return NULL;
206 }
207
208
209 static pvc_device* add_pvc(struct net_device *dev, u16 dlci)
210 {
211 hdlc_device *hdlc = dev_to_hdlc(dev);
212 pvc_device *pvc, **pvc_p = &state(hdlc)->first_pvc;
213
214 while (*pvc_p) {
215 if ((*pvc_p)->dlci == dlci)
216 return *pvc_p;
217 if ((*pvc_p)->dlci > dlci)
218 break; /* the list is sorted */
219 pvc_p = &(*pvc_p)->next;
220 }
221
222 pvc = kzalloc(sizeof(pvc_device), GFP_ATOMIC);
223 #ifdef DEBUG_PVC
224 printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev);
225 #endif
226 if (!pvc)
227 return NULL;
228
229 pvc->dlci = dlci;
230 pvc->frad = dev;
231 pvc->next = *pvc_p; /* Put it in the chain */
232 *pvc_p = pvc;
233 return pvc;
234 }
235
236
237 static inline int pvc_is_used(pvc_device *pvc)
238 {
239 return pvc->main || pvc->ether;
240 }
241
242
243 static inline void pvc_carrier(int on, pvc_device *pvc)
244 {
245 if (on) {
246 if (pvc->main)
247 if (!netif_carrier_ok(pvc->main))
248 netif_carrier_on(pvc->main);
249 if (pvc->ether)
250 if (!netif_carrier_ok(pvc->ether))
251 netif_carrier_on(pvc->ether);
252 } else {
253 if (pvc->main)
254 if (netif_carrier_ok(pvc->main))
255 netif_carrier_off(pvc->main);
256 if (pvc->ether)
257 if (netif_carrier_ok(pvc->ether))
258 netif_carrier_off(pvc->ether);
259 }
260 }
261
262
263 static inline void delete_unused_pvcs(hdlc_device *hdlc)
264 {
265 pvc_device **pvc_p = &state(hdlc)->first_pvc;
266
267 while (*pvc_p) {
268 if (!pvc_is_used(*pvc_p)) {
269 pvc_device *pvc = *pvc_p;
270 #ifdef DEBUG_PVC
271 printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc);
272 #endif
273 *pvc_p = pvc->next;
274 kfree(pvc);
275 continue;
276 }
277 pvc_p = &(*pvc_p)->next;
278 }
279 }
280
281
282 static inline struct net_device** get_dev_p(pvc_device *pvc, int type)
283 {
284 if (type == ARPHRD_ETHER)
285 return &pvc->ether;
286 else
287 return &pvc->main;
288 }
289
290
291 static int fr_hard_header(struct sk_buff **skb_p, u16 dlci)
292 {
293 u16 head_len;
294 struct sk_buff *skb = *skb_p;
295
296 switch (skb->protocol) {
297 case __constant_htons(NLPID_CCITT_ANSI_LMI):
298 head_len = 4;
299 skb_push(skb, head_len);
300 skb->data[3] = NLPID_CCITT_ANSI_LMI;
301 break;
302
303 case __constant_htons(NLPID_CISCO_LMI):
304 head_len = 4;
305 skb_push(skb, head_len);
306 skb->data[3] = NLPID_CISCO_LMI;
307 break;
308
309 case __constant_htons(ETH_P_IP):
310 head_len = 4;
311 skb_push(skb, head_len);
312 skb->data[3] = NLPID_IP;
313 break;
314
315 case __constant_htons(ETH_P_IPV6):
316 head_len = 4;
317 skb_push(skb, head_len);
318 skb->data[3] = NLPID_IPV6;
319 break;
320
321 case __constant_htons(ETH_P_802_3):
322 head_len = 10;
323 if (skb_headroom(skb) < head_len) {
324 struct sk_buff *skb2 = skb_realloc_headroom(skb,
325 head_len);
326 if (!skb2)
327 return -ENOBUFS;
328 dev_kfree_skb(skb);
329 skb = *skb_p = skb2;
330 }
331 skb_push(skb, head_len);
332 skb->data[3] = FR_PAD;
333 skb->data[4] = NLPID_SNAP;
334 skb->data[5] = FR_PAD;
335 skb->data[6] = 0x80;
336 skb->data[7] = 0xC2;
337 skb->data[8] = 0x00;
338 skb->data[9] = 0x07; /* bridged Ethernet frame w/out FCS */
339 break;
340
341 default:
342 head_len = 10;
343 skb_push(skb, head_len);
344 skb->data[3] = FR_PAD;
345 skb->data[4] = NLPID_SNAP;
346 skb->data[5] = FR_PAD;
347 skb->data[6] = FR_PAD;
348 skb->data[7] = FR_PAD;
349 *(__be16*)(skb->data + 8) = skb->protocol;
350 }
351
352 dlci_to_q922(skb->data, dlci);
353 skb->data[2] = FR_UI;
354 return 0;
355 }
356
357
358
359 static int pvc_open(struct net_device *dev)
360 {
361 pvc_device *pvc = pvcdev_to_desc(dev)->pvc;
362
363 if ((pvc->frad->flags & IFF_UP) == 0)
364 return -EIO; /* Frad must be UP in order to activate PVC */
365
366 if (pvc->open_count++ == 0) {
367 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
368 if (state(hdlc)->settings.lmi == LMI_NONE)
369 pvc->state.active = netif_carrier_ok(pvc->frad);
370
371 pvc_carrier(pvc->state.active, pvc);
372 state(hdlc)->dce_changed = 1;
373 }
374 return 0;
375 }
376
377
378
379 static int pvc_close(struct net_device *dev)
380 {
381 pvc_device *pvc = pvcdev_to_desc(dev)->pvc;
382
383 if (--pvc->open_count == 0) {
384 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
385 if (state(hdlc)->settings.lmi == LMI_NONE)
386 pvc->state.active = 0;
387
388 if (state(hdlc)->settings.dce) {
389 state(hdlc)->dce_changed = 1;
390 pvc->state.active = 0;
391 }
392 }
393 return 0;
394 }
395
396
397
398 static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
399 {
400 pvc_device *pvc = pvcdev_to_desc(dev)->pvc;
401 fr_proto_pvc_info info;
402
403 if (ifr->ifr_settings.type == IF_GET_PROTO) {
404 if (dev->type == ARPHRD_ETHER)
405 ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
406 else
407 ifr->ifr_settings.type = IF_PROTO_FR_PVC;
408
409 if (ifr->ifr_settings.size < sizeof(info)) {
410 /* data size wanted */
411 ifr->ifr_settings.size = sizeof(info);
412 return -ENOBUFS;
413 }
414
415 info.dlci = pvc->dlci;
416 memcpy(info.master, pvc->frad->name, IFNAMSIZ);
417 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
418 &info, sizeof(info)))
419 return -EFAULT;
420 return 0;
421 }
422
423 return -EINVAL;
424 }
425
426 static int pvc_xmit(struct sk_buff *skb, struct net_device *dev)
427 {
428 pvc_device *pvc = pvcdev_to_desc(dev)->pvc;
429 struct net_device_stats *stats = pvc_get_stats(dev);
430
431 if (pvc->state.active) {
432 if (dev->type == ARPHRD_ETHER) {
433 int pad = ETH_ZLEN - skb->len;
434 if (pad > 0) { /* Pad the frame with zeros */
435 int len = skb->len;
436 if (skb_tailroom(skb) < pad)
437 if (pskb_expand_head(skb, 0, pad,
438 GFP_ATOMIC)) {
439 stats->tx_dropped++;
440 dev_kfree_skb(skb);
441 return 0;
442 }
443 skb_put(skb, pad);
444 memset(skb->data + len, 0, pad);
445 }
446 skb->protocol = __constant_htons(ETH_P_802_3);
447 }
448 if (!fr_hard_header(&skb, pvc->dlci)) {
449 stats->tx_bytes += skb->len;
450 stats->tx_packets++;
451 if (pvc->state.fecn) /* TX Congestion counter */
452 stats->tx_compressed++;
453 skb->dev = pvc->frad;
454 dev_queue_xmit(skb);
455 return 0;
456 }
457 }
458
459 stats->tx_dropped++;
460 dev_kfree_skb(skb);
461 return 0;
462 }
463
464
465
466 static int pvc_change_mtu(struct net_device *dev, int new_mtu)
467 {
468 if ((new_mtu < 68) || (new_mtu > HDLC_MAX_MTU))
469 return -EINVAL;
470 dev->mtu = new_mtu;
471 return 0;
472 }
473
474
475
476 static inline void fr_log_dlci_active(pvc_device *pvc)
477 {
478 printk(KERN_INFO "%s: DLCI %d [%s%s%s]%s %s\n",
479 pvc->frad->name,
480 pvc->dlci,
481 pvc->main ? pvc->main->name : "",
482 pvc->main && pvc->ether ? " " : "",
483 pvc->ether ? pvc->ether->name : "",
484 pvc->state.new ? " new" : "",
485 !pvc->state.exist ? "deleted" :
486 pvc->state.active ? "active" : "inactive");
487 }
488
489
490
491 static inline u8 fr_lmi_nextseq(u8 x)
492 {
493 x++;
494 return x ? x : 1;
495 }
496
497
498 static void fr_lmi_send(struct net_device *dev, int fullrep)
499 {
500 hdlc_device *hdlc = dev_to_hdlc(dev);
501 struct sk_buff *skb;
502 pvc_device *pvc = state(hdlc)->first_pvc;
503 int lmi = state(hdlc)->settings.lmi;
504 int dce = state(hdlc)->settings.dce;
505 int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
506 int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
507 u8 *data;
508 int i = 0;
509
510 if (dce && fullrep) {
511 len += state(hdlc)->dce_pvc_count * (2 + stat_len);
512 if (len > HDLC_MAX_MRU) {
513 printk(KERN_WARNING "%s: Too many PVCs while sending "
514 "LMI full report\n", dev->name);
515 return;
516 }
517 }
518
519 skb = dev_alloc_skb(len);
520 if (!skb) {
521 printk(KERN_WARNING "%s: Memory squeeze on fr_lmi_send()\n",
522 dev->name);
523 return;
524 }
525 memset(skb->data, 0, len);
526 skb_reserve(skb, 4);
527 if (lmi == LMI_CISCO) {
528 skb->protocol = __constant_htons(NLPID_CISCO_LMI);
529 fr_hard_header(&skb, LMI_CISCO_DLCI);
530 } else {
531 skb->protocol = __constant_htons(NLPID_CCITT_ANSI_LMI);
532 fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI);
533 }
534 data = skb_tail_pointer(skb);
535 data[i++] = LMI_CALLREF;
536 data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
537 if (lmi == LMI_ANSI)
538 data[i++] = LMI_ANSI_LOCKSHIFT;
539 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
540 LMI_ANSI_CISCO_REPTYPE;
541 data[i++] = LMI_REPT_LEN;
542 data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
543 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
544 data[i++] = LMI_INTEG_LEN;
545 data[i++] = state(hdlc)->txseq =
546 fr_lmi_nextseq(state(hdlc)->txseq);
547 data[i++] = state(hdlc)->rxseq;
548
549 if (dce && fullrep) {
550 while (pvc) {
551 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
552 LMI_ANSI_CISCO_PVCSTAT;
553 data[i++] = stat_len;
554
555 /* LMI start/restart */
556 if (state(hdlc)->reliable && !pvc->state.exist) {
557 pvc->state.exist = pvc->state.new = 1;
558 fr_log_dlci_active(pvc);
559 }
560
561 /* ifconfig PVC up */
562 if (pvc->open_count && !pvc->state.active &&
563 pvc->state.exist && !pvc->state.new) {
564 pvc_carrier(1, pvc);
565 pvc->state.active = 1;
566 fr_log_dlci_active(pvc);
567 }
568
569 if (lmi == LMI_CISCO) {
570 data[i] = pvc->dlci >> 8;
571 data[i + 1] = pvc->dlci & 0xFF;
572 } else {
573 data[i] = (pvc->dlci >> 4) & 0x3F;
574 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
575 data[i + 2] = 0x80;
576 }
577
578 if (pvc->state.new)
579 data[i + 2] |= 0x08;
580 else if (pvc->state.active)
581 data[i + 2] |= 0x02;
582
583 i += stat_len;
584 pvc = pvc->next;
585 }
586 }
587
588 skb_put(skb, i);
589 skb->priority = TC_PRIO_CONTROL;
590 skb->dev = dev;
591 skb_reset_network_header(skb);
592
593 dev_queue_xmit(skb);
594 }
595
596
597
598 static void fr_set_link_state(int reliable, struct net_device *dev)
599 {
600 hdlc_device *hdlc = dev_to_hdlc(dev);
601 pvc_device *pvc = state(hdlc)->first_pvc;
602
603 state(hdlc)->reliable = reliable;
604 if (reliable) {
605 netif_dormant_off(dev);
606 state(hdlc)->n391cnt = 0; /* Request full status */
607 state(hdlc)->dce_changed = 1;
608
609 if (state(hdlc)->settings.lmi == LMI_NONE) {
610 while (pvc) { /* Activate all PVCs */
611 pvc_carrier(1, pvc);
612 pvc->state.exist = pvc->state.active = 1;
613 pvc->state.new = 0;
614 pvc = pvc->next;
615 }
616 }
617 } else {
618 netif_dormant_on(dev);
619 while (pvc) { /* Deactivate all PVCs */
620 pvc_carrier(0, pvc);
621 pvc->state.exist = pvc->state.active = 0;
622 pvc->state.new = 0;
623 if (!state(hdlc)->settings.dce)
624 pvc->state.bandwidth = 0;
625 pvc = pvc->next;
626 }
627 }
628 }
629
630
631 static void fr_timer(unsigned long arg)
632 {
633 struct net_device *dev = (struct net_device *)arg;
634 hdlc_device *hdlc = dev_to_hdlc(dev);
635 int i, cnt = 0, reliable;
636 u32 list;
637
638 if (state(hdlc)->settings.dce) {
639 reliable = state(hdlc)->request &&
640 time_before(jiffies, state(hdlc)->last_poll +
641 state(hdlc)->settings.t392 * HZ);
642 state(hdlc)->request = 0;
643 } else {
644 state(hdlc)->last_errors <<= 1; /* Shift the list */
645 if (state(hdlc)->request) {
646 if (state(hdlc)->reliable)
647 printk(KERN_INFO "%s: No LMI status reply "
648 "received\n", dev->name);
649 state(hdlc)->last_errors |= 1;
650 }
651
652 list = state(hdlc)->last_errors;
653 for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1)
654 cnt += (list & 1); /* errors count */
655
656 reliable = (cnt < state(hdlc)->settings.n392);
657 }
658
659 if (state(hdlc)->reliable != reliable) {
660 printk(KERN_INFO "%s: Link %sreliable\n", dev->name,
661 reliable ? "" : "un");
662 fr_set_link_state(reliable, dev);
663 }
664
665 if (state(hdlc)->settings.dce)
666 state(hdlc)->timer.expires = jiffies +
667 state(hdlc)->settings.t392 * HZ;
668 else {
669 if (state(hdlc)->n391cnt)
670 state(hdlc)->n391cnt--;
671
672 fr_lmi_send(dev, state(hdlc)->n391cnt == 0);
673
674 state(hdlc)->last_poll = jiffies;
675 state(hdlc)->request = 1;
676 state(hdlc)->timer.expires = jiffies +
677 state(hdlc)->settings.t391 * HZ;
678 }
679
680 state(hdlc)->timer.function = fr_timer;
681 state(hdlc)->timer.data = arg;
682 add_timer(&state(hdlc)->timer);
683 }
684
685
686 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
687 {
688 hdlc_device *hdlc = dev_to_hdlc(dev);
689 pvc_device *pvc;
690 u8 rxseq, txseq;
691 int lmi = state(hdlc)->settings.lmi;
692 int dce = state(hdlc)->settings.dce;
693 int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;
694
695 if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
696 LMI_CCITT_CISCO_LENGTH)) {
697 printk(KERN_INFO "%s: Short LMI frame\n", dev->name);
698 return 1;
699 }
700
701 if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
702 NLPID_CCITT_ANSI_LMI)) {
703 printk(KERN_INFO "%s: Received non-LMI frame with LMI DLCI\n",
704 dev->name);
705 return 1;
706 }
707
708 if (skb->data[4] != LMI_CALLREF) {
709 printk(KERN_INFO "%s: Invalid LMI Call reference (0x%02X)\n",
710 dev->name, skb->data[4]);
711 return 1;
712 }
713
714 if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
715 printk(KERN_INFO "%s: Invalid LMI Message type (0x%02X)\n",
716 dev->name, skb->data[5]);
717 return 1;
718 }
719
720 if (lmi == LMI_ANSI) {
721 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
722 printk(KERN_INFO "%s: Not ANSI locking shift in LMI"
723 " message (0x%02X)\n", dev->name, skb->data[6]);
724 return 1;
725 }
726 i = 7;
727 } else
728 i = 6;
729
730 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
731 LMI_ANSI_CISCO_REPTYPE)) {
732 printk(KERN_INFO "%s: Not an LMI Report type IE (0x%02X)\n",
733 dev->name, skb->data[i]);
734 return 1;
735 }
736
737 if (skb->data[++i] != LMI_REPT_LEN) {
738 printk(KERN_INFO "%s: Invalid LMI Report type IE length"
739 " (%u)\n", dev->name, skb->data[i]);
740 return 1;
741 }
742
743 reptype = skb->data[++i];
744 if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
745 printk(KERN_INFO "%s: Unsupported LMI Report type (0x%02X)\n",
746 dev->name, reptype);
747 return 1;
748 }
749
750 if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
751 LMI_ANSI_CISCO_ALIVE)) {
752 printk(KERN_INFO "%s: Not an LMI Link integrity verification"
753 " IE (0x%02X)\n", dev->name, skb->data[i]);
754 return 1;
755 }
756
757 if (skb->data[++i] != LMI_INTEG_LEN) {
758 printk(KERN_INFO "%s: Invalid LMI Link integrity verification"
759 " IE length (%u)\n", dev->name, skb->data[i]);
760 return 1;
761 }
762 i++;
763
764 state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */
765 rxseq = skb->data[i++]; /* Should confirm our sequence */
766
767 txseq = state(hdlc)->txseq;
768
769 if (dce)
770 state(hdlc)->last_poll = jiffies;
771
772 error = 0;
773 if (!state(hdlc)->reliable)
774 error = 1;
775
776 if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */
777 state(hdlc)->n391cnt = 0;
778 error = 1;
779 }
780
781 if (dce) {
782 if (state(hdlc)->fullrep_sent && !error) {
783 /* Stop sending full report - the last one has been confirmed by DTE */
784 state(hdlc)->fullrep_sent = 0;
785 pvc = state(hdlc)->first_pvc;
786 while (pvc) {
787 if (pvc->state.new) {
788 pvc->state.new = 0;
789
790 /* Tell DTE that new PVC is now active */
791 state(hdlc)->dce_changed = 1;
792 }
793 pvc = pvc->next;
794 }
795 }
796
797 if (state(hdlc)->dce_changed) {
798 reptype = LMI_FULLREP;
799 state(hdlc)->fullrep_sent = 1;
800 state(hdlc)->dce_changed = 0;
801 }
802
803 state(hdlc)->request = 1; /* got request */
804 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
805 return 0;
806 }
807
808 /* DTE */
809
810 state(hdlc)->request = 0; /* got response, no request pending */
811
812 if (error)
813 return 0;
814
815 if (reptype != LMI_FULLREP)
816 return 0;
817
818 pvc = state(hdlc)->first_pvc;
819
820 while (pvc) {
821 pvc->state.deleted = 1;
822 pvc = pvc->next;
823 }
824
825 no_ram = 0;
826 while (skb->len >= i + 2 + stat_len) {
827 u16 dlci;
828 u32 bw;
829 unsigned int active, new;
830
831 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
832 LMI_ANSI_CISCO_PVCSTAT)) {
833 printk(KERN_INFO "%s: Not an LMI PVC status IE"
834 " (0x%02X)\n", dev->name, skb->data[i]);
835 return 1;
836 }
837
838 if (skb->data[++i] != stat_len) {
839 printk(KERN_INFO "%s: Invalid LMI PVC status IE length"
840 " (%u)\n", dev->name, skb->data[i]);
841 return 1;
842 }
843 i++;
844
845 new = !! (skb->data[i + 2] & 0x08);
846 active = !! (skb->data[i + 2] & 0x02);
847 if (lmi == LMI_CISCO) {
848 dlci = (skb->data[i] << 8) | skb->data[i + 1];
849 bw = (skb->data[i + 3] << 16) |
850 (skb->data[i + 4] << 8) |
851 (skb->data[i + 5]);
852 } else {
853 dlci = ((skb->data[i] & 0x3F) << 4) |
854 ((skb->data[i + 1] & 0x78) >> 3);
855 bw = 0;
856 }
857
858 pvc = add_pvc(dev, dlci);
859
860 if (!pvc && !no_ram) {
861 printk(KERN_WARNING
862 "%s: Memory squeeze on fr_lmi_recv()\n",
863 dev->name);
864 no_ram = 1;
865 }
866
867 if (pvc) {
868 pvc->state.exist = 1;
869 pvc->state.deleted = 0;
870 if (active != pvc->state.active ||
871 new != pvc->state.new ||
872 bw != pvc->state.bandwidth ||
873 !pvc->state.exist) {
874 pvc->state.new = new;
875 pvc->state.active = active;
876 pvc->state.bandwidth = bw;
877 pvc_carrier(active, pvc);
878 fr_log_dlci_active(pvc);
879 }
880 }
881
882 i += stat_len;
883 }
884
885 pvc = state(hdlc)->first_pvc;
886
887 while (pvc) {
888 if (pvc->state.deleted && pvc->state.exist) {
889 pvc_carrier(0, pvc);
890 pvc->state.active = pvc->state.new = 0;
891 pvc->state.exist = 0;
892 pvc->state.bandwidth = 0;
893 fr_log_dlci_active(pvc);
894 }
895 pvc = pvc->next;
896 }
897
898 /* Next full report after N391 polls */
899 state(hdlc)->n391cnt = state(hdlc)->settings.n391;
900
901 return 0;
902 }
903
904
905 static int fr_rx(struct sk_buff *skb)
906 {
907 struct net_device *frad = skb->dev;
908 hdlc_device *hdlc = dev_to_hdlc(frad);
909 fr_hdr *fh = (fr_hdr*)skb->data;
910 u8 *data = skb->data;
911 u16 dlci;
912 pvc_device *pvc;
913 struct net_device *dev = NULL;
914
915 if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
916 goto rx_error;
917
918 dlci = q922_to_dlci(skb->data);
919
920 if ((dlci == LMI_CCITT_ANSI_DLCI &&
921 (state(hdlc)->settings.lmi == LMI_ANSI ||
922 state(hdlc)->settings.lmi == LMI_CCITT)) ||
923 (dlci == LMI_CISCO_DLCI &&
924 state(hdlc)->settings.lmi == LMI_CISCO)) {
925 if (fr_lmi_recv(frad, skb))
926 goto rx_error;
927 dev_kfree_skb_any(skb);
928 return NET_RX_SUCCESS;
929 }
930
931 pvc = find_pvc(hdlc, dlci);
932 if (!pvc) {
933 #ifdef DEBUG_PKT
934 printk(KERN_INFO "%s: No PVC for received frame's DLCI %d\n",
935 frad->name, dlci);
936 #endif
937 dev_kfree_skb_any(skb);
938 return NET_RX_DROP;
939 }
940
941 if (pvc->state.fecn != fh->fecn) {
942 #ifdef DEBUG_ECN
943 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name,
944 dlci, fh->fecn ? "N" : "FF");
945 #endif
946 pvc->state.fecn ^= 1;
947 }
948
949 if (pvc->state.becn != fh->becn) {
950 #ifdef DEBUG_ECN
951 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name,
952 dlci, fh->becn ? "N" : "FF");
953 #endif
954 pvc->state.becn ^= 1;
955 }
956
957
958 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
959 dev_to_hdlc(frad)->stats.rx_dropped++;
960 return NET_RX_DROP;
961 }
962
963 if (data[3] == NLPID_IP) {
964 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
965 dev = pvc->main;
966 skb->protocol = htons(ETH_P_IP);
967
968 } else if (data[3] == NLPID_IPV6) {
969 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
970 dev = pvc->main;
971 skb->protocol = htons(ETH_P_IPV6);
972
973 } else if (skb->len > 10 && data[3] == FR_PAD &&
974 data[4] == NLPID_SNAP && data[5] == FR_PAD) {
975 u16 oui = ntohs(*(__be16*)(data + 6));
976 u16 pid = ntohs(*(__be16*)(data + 8));
977 skb_pull(skb, 10);
978
979 switch ((((u32)oui) << 16) | pid) {
980 case ETH_P_ARP: /* routed frame with SNAP */
981 case ETH_P_IPX:
982 case ETH_P_IP: /* a long variant */
983 case ETH_P_IPV6:
984 dev = pvc->main;
985 skb->protocol = htons(pid);
986 break;
987
988 case 0x80C20007: /* bridged Ethernet frame */
989 if ((dev = pvc->ether) != NULL)
990 skb->protocol = eth_type_trans(skb, dev);
991 break;
992
993 default:
994 printk(KERN_INFO "%s: Unsupported protocol, OUI=%x "
995 "PID=%x\n", frad->name, oui, pid);
996 dev_kfree_skb_any(skb);
997 return NET_RX_DROP;
998 }
999 } else {
1000 printk(KERN_INFO "%s: Unsupported protocol, NLPID=%x "
1001 "length = %i\n", frad->name, data[3], skb->len);
1002 dev_kfree_skb_any(skb);
1003 return NET_RX_DROP;
1004 }
1005
1006 if (dev) {
1007 struct net_device_stats *stats = pvc_get_stats(dev);
1008 stats->rx_packets++; /* PVC traffic */
1009 stats->rx_bytes += skb->len;
1010 if (pvc->state.becn)
1011 stats->rx_compressed++;
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:
1020 dev_to_hdlc(frad)->stats.rx_errors++; /* Mark error */
1021 dev_kfree_skb_any(skb);
1022 return NET_RX_DROP;
1023 }
1024
1025
1026
1027 static 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
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);
1043 /* First poll after 1 s */
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);
1048 } else
1049 fr_set_link_state(1, dev);
1050 }
1051
1052
1053 static 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
1059 if (state(hdlc)->settings.lmi != LMI_NONE)
1060 del_timer_sync(&state(hdlc)->timer);
1061 fr_set_link_state(0, dev);
1062 }
1063
1064
1065 static void fr_close(struct net_device *dev)
1066 {
1067 hdlc_device *hdlc = dev_to_hdlc(dev);
1068 pvc_device *pvc = state(hdlc)->first_pvc;
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
1079
1080 static void pvc_setup(struct net_device *dev)
1081 {
1082 dev->type = ARPHRD_DLCI;
1083 dev->flags = IFF_POINTOPOINT;
1084 dev->hard_header_len = 10;
1085 dev->addr_len = 2;
1086 }
1087
1088 static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
1089 {
1090 hdlc_device *hdlc = dev_to_hdlc(frad);
1091 pvc_device *pvc = NULL;
1092 struct net_device *dev;
1093 int result, used;
1094 char * prefix = "pvc%d";
1095
1096 if (type == ARPHRD_ETHER)
1097 prefix = "pvceth%d";
1098
1099 if ((pvc = add_pvc(frad, dlci)) == NULL) {
1100 printk(KERN_WARNING "%s: Memory squeeze on fr_add_pvc()\n",
1101 frad->name);
1102 return -ENOBUFS;
1103 }
1104
1105 if (*get_dev_p(pvc, type))
1106 return -EEXIST;
1107
1108 used = pvc_is_used(pvc);
1109
1110 if (type == ARPHRD_ETHER)
1111 dev = alloc_netdev(sizeof(struct pvc_desc), "pvceth%d",
1112 ether_setup);
1113 else
1114 dev = alloc_netdev(sizeof(struct pvc_desc), "pvc%d", pvc_setup);
1115
1116 if (!dev) {
1117 printk(KERN_WARNING "%s: Memory squeeze on fr_pvc()\n",
1118 frad->name);
1119 delete_unused_pvcs(hdlc);
1120 return -ENOBUFS;
1121 }
1122
1123 if (type == ARPHRD_ETHER) {
1124 memcpy(dev->dev_addr, "\x00\x01", 2);
1125 get_random_bytes(dev->dev_addr + 2, ETH_ALEN - 2);
1126 } else {
1127 *(__be16*)dev->dev_addr = htons(dlci);
1128 dlci_to_q922(dev->broadcast, dlci);
1129 }
1130 dev->hard_start_xmit = pvc_xmit;
1131 dev->get_stats = pvc_get_stats;
1132 dev->open = pvc_open;
1133 dev->stop = pvc_close;
1134 dev->do_ioctl = pvc_ioctl;
1135 dev->change_mtu = pvc_change_mtu;
1136 dev->mtu = HDLC_MAX_MTU;
1137 dev->tx_queue_len = 0;
1138 pvcdev_to_desc(dev)->pvc = pvc;
1139
1140 result = dev_alloc_name(dev, dev->name);
1141 if (result < 0) {
1142 free_netdev(dev);
1143 delete_unused_pvcs(hdlc);
1144 return result;
1145 }
1146
1147 if (register_netdevice(dev) != 0) {
1148 free_netdev(dev);
1149 delete_unused_pvcs(hdlc);
1150 return -EIO;
1151 }
1152
1153 dev->destructor = free_netdev;
1154 *get_dev_p(pvc, type) = dev;
1155 if (!used) {
1156 state(hdlc)->dce_changed = 1;
1157 state(hdlc)->dce_pvc_count++;
1158 }
1159 return 0;
1160 }
1161
1162
1163
1164 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
1165 {
1166 pvc_device *pvc;
1167 struct net_device *dev;
1168
1169 if ((pvc = find_pvc(hdlc, dlci)) == NULL)
1170 return -ENOENT;
1171
1172 if ((dev = *get_dev_p(pvc, type)) == NULL)
1173 return -ENOENT;
1174
1175 if (dev->flags & IFF_UP)
1176 return -EBUSY; /* PVC in use */
1177
1178 unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
1179 *get_dev_p(pvc, type) = NULL;
1180
1181 if (!pvc_is_used(pvc)) {
1182 state(hdlc)->dce_pvc_count--;
1183 state(hdlc)->dce_changed = 1;
1184 }
1185 delete_unused_pvcs(hdlc);
1186 return 0;
1187 }
1188
1189
1190
1191 static void fr_destroy(struct net_device *frad)
1192 {
1193 hdlc_device *hdlc = dev_to_hdlc(frad);
1194 pvc_device *pvc = state(hdlc)->first_pvc;
1195 state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */
1196 state(hdlc)->dce_pvc_count = 0;
1197 state(hdlc)->dce_changed = 1;
1198
1199 while (pvc) {
1200 pvc_device *next = pvc->next;
1201 /* destructors will free_netdev() main and ether */
1202 if (pvc->main)
1203 unregister_netdevice(pvc->main);
1204
1205 if (pvc->ether)
1206 unregister_netdevice(pvc->ether);
1207
1208 kfree(pvc);
1209 pvc = next;
1210 }
1211 }
1212
1213
1214 static struct hdlc_proto proto = {
1215 .close = fr_close,
1216 .start = fr_start,
1217 .stop = fr_stop,
1218 .detach = fr_destroy,
1219 .ioctl = fr_ioctl,
1220 .netif_rx = fr_rx,
1221 .module = THIS_MODULE,
1222 };
1223
1224
1225 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr)
1226 {
1227 fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
1228 const size_t size = sizeof(fr_proto);
1229 fr_proto new_settings;
1230 hdlc_device *hdlc = dev_to_hdlc(dev);
1231 fr_proto_pvc pvc;
1232 int result;
1233
1234 switch (ifr->ifr_settings.type) {
1235 case IF_GET_PROTO:
1236 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1237 return -EINVAL;
1238 ifr->ifr_settings.type = IF_PROTO_FR;
1239 if (ifr->ifr_settings.size < size) {
1240 ifr->ifr_settings.size = size; /* data size wanted */
1241 return -ENOBUFS;
1242 }
1243 if (copy_to_user(fr_s, &state(hdlc)->settings, size))
1244 return -EFAULT;
1245 return 0;
1246
1247 case IF_PROTO_FR:
1248 if(!capable(CAP_NET_ADMIN))
1249 return -EPERM;
1250
1251 if(dev->flags & IFF_UP)
1252 return -EBUSY;
1253
1254 if (copy_from_user(&new_settings, fr_s, size))
1255 return -EFAULT;
1256
1257 if (new_settings.lmi == LMI_DEFAULT)
1258 new_settings.lmi = LMI_ANSI;
1259
1260 if ((new_settings.lmi != LMI_NONE &&
1261 new_settings.lmi != LMI_ANSI &&
1262 new_settings.lmi != LMI_CCITT &&
1263 new_settings.lmi != LMI_CISCO) ||
1264 new_settings.t391 < 1 ||
1265 new_settings.t392 < 2 ||
1266 new_settings.n391 < 1 ||
1267 new_settings.n392 < 1 ||
1268 new_settings.n393 < new_settings.n392 ||
1269 new_settings.n393 > 32 ||
1270 (new_settings.dce != 0 &&
1271 new_settings.dce != 1))
1272 return -EINVAL;
1273
1274 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1275 if (result)
1276 return result;
1277
1278 if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */
1279 result = attach_hdlc_protocol(dev, &proto,
1280 sizeof(struct frad_state));
1281 if (result)
1282 return result;
1283 state(hdlc)->first_pvc = NULL;
1284 state(hdlc)->dce_pvc_count = 0;
1285 }
1286 memcpy(&state(hdlc)->settings, &new_settings, size);
1287
1288 dev->hard_start_xmit = hdlc->xmit;
1289 dev->type = ARPHRD_FRAD;
1290 return 0;
1291
1292 case IF_PROTO_FR_ADD_PVC:
1293 case IF_PROTO_FR_DEL_PVC:
1294 case IF_PROTO_FR_ADD_ETH_PVC:
1295 case IF_PROTO_FR_DEL_ETH_PVC:
1296 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1297 return -EINVAL;
1298
1299 if(!capable(CAP_NET_ADMIN))
1300 return -EPERM;
1301
1302 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
1303 sizeof(fr_proto_pvc)))
1304 return -EFAULT;
1305
1306 if (pvc.dlci <= 0 || pvc.dlci >= 1024)
1307 return -EINVAL; /* Only 10 bits, DLCI 0 reserved */
1308
1309 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
1310 ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
1311 result = ARPHRD_ETHER; /* bridged Ethernet device */
1312 else
1313 result = ARPHRD_DLCI;
1314
1315 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
1316 ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
1317 return fr_add_pvc(dev, pvc.dlci, result);
1318 else
1319 return fr_del_pvc(hdlc, pvc.dlci, result);
1320 }
1321
1322 return -EINVAL;
1323 }
1324
1325
1326 static int __init mod_init(void)
1327 {
1328 register_hdlc_protocol(&proto);
1329 return 0;
1330 }
1331
1332
1333 static void __exit mod_exit(void)
1334 {
1335 unregister_hdlc_protocol(&proto);
1336 }
1337
1338
1339 module_init(mod_init);
1340 module_exit(mod_exit);
1341
1342 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
1343 MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC");
1344 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
This page took 0.072715 seconds and 5 git commands to generate.