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Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[wrt350n-kernel.git] / drivers / net / wan / hdlc_fr.c
blobc4ab0326f91103b03dcd01dd7b1a153101ef4ea9
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/inetdevice.h>
46 #include <linux/lapb.h>
47 #include <linux/rtnetlink.h>
48 #include <linux/etherdevice.h>
49 #include <linux/hdlc.h>
50
51 #undef DEBUG_PKT
52 #undef DEBUG_ECN
53 #undef DEBUG_LINK
54 #undef DEBUG_PROTO
55 #undef DEBUG_PVC
56
57 #define FR_UI 0x03
58 #define FR_PAD 0x00
59
60 #define NLPID_IP 0xCC
61 #define NLPID_IPV6 0x8E
62 #define NLPID_SNAP 0x80
63 #define NLPID_PAD 0x00
64 #define NLPID_CCITT_ANSI_LMI 0x08
65 #define NLPID_CISCO_LMI 0x09
66
67
68 #define LMI_CCITT_ANSI_DLCI 0 /* LMI DLCI */
69 #define LMI_CISCO_DLCI 1023
70
71 #define LMI_CALLREF 0x00 /* Call Reference */
72 #define LMI_ANSI_LOCKSHIFT 0x95 /* ANSI locking shift */
73 #define LMI_ANSI_CISCO_REPTYPE 0x01 /* report type */
74 #define LMI_CCITT_REPTYPE 0x51
75 #define LMI_ANSI_CISCO_ALIVE 0x03 /* keep alive */
76 #define LMI_CCITT_ALIVE 0x53
77 #define LMI_ANSI_CISCO_PVCSTAT 0x07 /* PVC status */
78 #define LMI_CCITT_PVCSTAT 0x57
79
80 #define LMI_FULLREP 0x00 /* full report */
81 #define LMI_INTEGRITY 0x01 /* link integrity report */
82 #define LMI_SINGLE 0x02 /* single PVC report */
83
84 #define LMI_STATUS_ENQUIRY 0x75
85 #define LMI_STATUS 0x7D /* reply */
86
87 #define LMI_REPT_LEN 1 /* report type element length */
88 #define LMI_INTEG_LEN 2 /* link integrity element length */
89
90 #define LMI_CCITT_CISCO_LENGTH 13 /* LMI frame lengths */
91 #define LMI_ANSI_LENGTH 14
92
93
94 typedef struct {
95 #if defined(__LITTLE_ENDIAN_BITFIELD)
96 unsigned ea1: 1;
97 unsigned cr: 1;
98 unsigned dlcih: 6;
99
100 unsigned ea2: 1;
101 unsigned de: 1;
102 unsigned becn: 1;
103 unsigned fecn: 1;
104 unsigned dlcil: 4;
105 #else
106 unsigned dlcih: 6;
107 unsigned cr: 1;
108 unsigned ea1: 1;
109
110 unsigned dlcil: 4;
111 unsigned fecn: 1;
112 unsigned becn: 1;
113 unsigned de: 1;
114 unsigned ea2: 1;
115 #endif
116 }__attribute__ ((packed)) fr_hdr;
117
118
119 typedef struct pvc_device_struct {
120 struct net_device *frad;
121 struct net_device *main;
122 struct net_device *ether; /* bridged Ethernet interface */
123 struct pvc_device_struct *next; /* Sorted in ascending DLCI order */
124 int dlci;
125 int open_count;
126
127 struct {
128 unsigned int new: 1;
129 unsigned int active: 1;
130 unsigned int exist: 1;
131 unsigned int deleted: 1;
132 unsigned int fecn: 1;
133 unsigned int becn: 1;
134 unsigned int bandwidth; /* Cisco LMI reporting only */
135 }state;
136 }pvc_device;
137
138 struct pvc_desc {
139 struct net_device_stats stats;
140 pvc_device *pvc;
141 };
142
143 struct frad_state {
144 fr_proto settings;
145 pvc_device *first_pvc;
146 int dce_pvc_count;
147
148 struct timer_list timer;
149 unsigned long last_poll;
150 int reliable;
151 int dce_changed;
152 int request;
153 int fullrep_sent;
154 u32 last_errors; /* last errors bit list */
155 u8 n391cnt;
156 u8 txseq; /* TX sequence number */
157 u8 rxseq; /* RX sequence number */
158 };
159
160
161 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr);
162
163
164 static inline u16 q922_to_dlci(u8 *hdr)
165 {
166 return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
167 }
168
169
170 static inline void dlci_to_q922(u8 *hdr, u16 dlci)
171 {
172 hdr[0] = (dlci >> 2) & 0xFC;
173 hdr[1] = ((dlci << 4) & 0xF0) | 0x01;
174 }
175
176
177 static inline struct frad_state* state(hdlc_device *hdlc)
178 {
179 return(struct frad_state *)(hdlc->state);
180 }
181
182 static inline struct pvc_desc* pvcdev_to_desc(struct net_device *dev)
183 {
184 return dev->priv;
185 }
186
187 static inline struct net_device_stats* pvc_get_stats(struct net_device *dev)
188 {
189 return &pvcdev_to_desc(dev)->stats;
190 }
191
192 static inline pvc_device* find_pvc(hdlc_device *hdlc, u16 dlci)
193 {
194 pvc_device *pvc = state(hdlc)->first_pvc;
195
196 while (pvc) {
197 if (pvc->dlci == dlci)
198 return pvc;
199 if (pvc->dlci > dlci)
200 return NULL; /* the listed is sorted */
201 pvc = pvc->next;
202 }
203
204 return NULL;
205 }
206
207
208 static pvc_device* add_pvc(struct net_device *dev, u16 dlci)
209 {
210 hdlc_device *hdlc = dev_to_hdlc(dev);
211 pvc_device *pvc, **pvc_p = &state(hdlc)->first_pvc;
212
213 while (*pvc_p) {
214 if ((*pvc_p)->dlci == dlci)
215 return *pvc_p;
216 if ((*pvc_p)->dlci > dlci)
217 break; /* the list is sorted */
218 pvc_p = &(*pvc_p)->next;
219 }
220
221 pvc = kzalloc(sizeof(pvc_device), GFP_ATOMIC);
222 #ifdef DEBUG_PVC
223 printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev);
224 #endif
225 if (!pvc)
226 return NULL;
227
228 pvc->dlci = dlci;
229 pvc->frad = dev;
230 pvc->next = *pvc_p; /* Put it in the chain */
231 *pvc_p = pvc;
232 return pvc;
233 }
234
235
236 static inline int pvc_is_used(pvc_device *pvc)
237 {
238 return pvc->main || pvc->ether;
239 }
240
241
242 static inline void pvc_carrier(int on, pvc_device *pvc)
243 {
244 if (on) {
245 if (pvc->main)
246 if (!netif_carrier_ok(pvc->main))
247 netif_carrier_on(pvc->main);
248 if (pvc->ether)
249 if (!netif_carrier_ok(pvc->ether))
250 netif_carrier_on(pvc->ether);
251 } else {
252 if (pvc->main)
253 if (netif_carrier_ok(pvc->main))
254 netif_carrier_off(pvc->main);
255 if (pvc->ether)
256 if (netif_carrier_ok(pvc->ether))
257 netif_carrier_off(pvc->ether);
258 }
259 }
260
261
262 static inline void delete_unused_pvcs(hdlc_device *hdlc)
263 {
264 pvc_device **pvc_p = &state(hdlc)->first_pvc;
265
266 while (*pvc_p) {
267 if (!pvc_is_used(*pvc_p)) {
268 pvc_device *pvc = *pvc_p;
269 #ifdef DEBUG_PVC
270 printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc);
271 #endif
272 *pvc_p = pvc->next;
273 kfree(pvc);
274 continue;
275 }
276 pvc_p = &(*pvc_p)->next;
277 }
278 }
279
280
281 static inline struct net_device** get_dev_p(pvc_device *pvc, int type)
282 {
283 if (type == ARPHRD_ETHER)
284 return &pvc->ether;
285 else
286 return &pvc->main;
287 }
288
289
290 static int fr_hard_header(struct sk_buff **skb_p, u16 dlci)
291 {
292 u16 head_len;
293 struct sk_buff *skb = *skb_p;
294
295 switch (skb->protocol) {
296 case __constant_htons(NLPID_CCITT_ANSI_LMI):
297 head_len = 4;
298 skb_push(skb, head_len);
299 skb->data[3] = NLPID_CCITT_ANSI_LMI;
300 break;
301
302 case __constant_htons(NLPID_CISCO_LMI):
303 head_len = 4;
304 skb_push(skb, head_len);
305 skb->data[3] = NLPID_CISCO_LMI;
306 break;
307
308 case __constant_htons(ETH_P_IP):
309 head_len = 4;
310 skb_push(skb, head_len);
311 skb->data[3] = NLPID_IP;
312 break;
313
314 case __constant_htons(ETH_P_IPV6):
315 head_len = 4;
316 skb_push(skb, head_len);
317 skb->data[3] = NLPID_IPV6;
318 break;
319
320 case __constant_htons(ETH_P_802_3):
321 head_len = 10;
322 if (skb_headroom(skb) < head_len) {
323 struct sk_buff *skb2 = skb_realloc_headroom(skb,
324 head_len);
325 if (!skb2)
326 return -ENOBUFS;
327 dev_kfree_skb(skb);
328 skb = *skb_p = skb2;
329 }
330 skb_push(skb, head_len);
331 skb->data[3] = FR_PAD;
332 skb->data[4] = NLPID_SNAP;
333 skb->data[5] = FR_PAD;
334 skb->data[6] = 0x80;
335 skb->data[7] = 0xC2;
336 skb->data[8] = 0x00;
337 skb->data[9] = 0x07; /* bridged Ethernet frame w/out FCS */
338 break;
339
340 default:
341 head_len = 10;
342 skb_push(skb, head_len);
343 skb->data[3] = FR_PAD;
344 skb->data[4] = NLPID_SNAP;
345 skb->data[5] = FR_PAD;
346 skb->data[6] = FR_PAD;
347 skb->data[7] = FR_PAD;
348 *(__be16*)(skb->data + 8) = skb->protocol;
349 }
350
351 dlci_to_q922(skb->data, dlci);
352 skb->data[2] = FR_UI;
353 return 0;
354 }
355
356
357
358 static int pvc_open(struct net_device *dev)
359 {
360 pvc_device *pvc = pvcdev_to_desc(dev)->pvc;
361
362 if ((pvc->frad->flags & IFF_UP) == 0)
363 return -EIO; /* Frad must be UP in order to activate PVC */
364
365 if (pvc->open_count++ == 0) {
366 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
367 if (state(hdlc)->settings.lmi == LMI_NONE)
368 pvc->state.active = netif_carrier_ok(pvc->frad);
369
370 pvc_carrier(pvc->state.active, pvc);
371 state(hdlc)->dce_changed = 1;
372 }
373 return 0;
374 }
375
376
377
378 static int pvc_close(struct net_device *dev)
379 {
380 pvc_device *pvc = pvcdev_to_desc(dev)->pvc;
381
382 if (--pvc->open_count == 0) {
383 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
384 if (state(hdlc)->settings.lmi == LMI_NONE)
385 pvc->state.active = 0;
386
387 if (state(hdlc)->settings.dce) {
388 state(hdlc)->dce_changed = 1;
389 pvc->state.active = 0;
390 }
391 }
392 return 0;
393 }
394
395
396
397 static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
398 {
399 pvc_device *pvc = pvcdev_to_desc(dev)->pvc;
400 fr_proto_pvc_info info;
401
402 if (ifr->ifr_settings.type == IF_GET_PROTO) {
403 if (dev->type == ARPHRD_ETHER)
404 ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
405 else
406 ifr->ifr_settings.type = IF_PROTO_FR_PVC;
407
408 if (ifr->ifr_settings.size < sizeof(info)) {
409 /* data size wanted */
410 ifr->ifr_settings.size = sizeof(info);
411 return -ENOBUFS;
412 }
413
414 info.dlci = pvc->dlci;
415 memcpy(info.master, pvc->frad->name, IFNAMSIZ);
416 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
417 &info, sizeof(info)))
418 return -EFAULT;
419 return 0;
420 }
421
422 return -EINVAL;
423 }
424
425 static int pvc_xmit(struct sk_buff *skb, struct net_device *dev)
426 {
427 pvc_device *pvc = pvcdev_to_desc(dev)->pvc;
428 struct net_device_stats *stats = pvc_get_stats(dev);
429
430 if (pvc->state.active) {
431 if (dev->type == ARPHRD_ETHER) {
432 int pad = ETH_ZLEN - skb->len;
433 if (pad > 0) { /* Pad the frame with zeros */
434 int len = skb->len;
435 if (skb_tailroom(skb) < pad)
436 if (pskb_expand_head(skb, 0, pad,
437 GFP_ATOMIC)) {
438 stats->tx_dropped++;
439 dev_kfree_skb(skb);
440 return 0;
441 }
442 skb_put(skb, pad);
443 memset(skb->data + len, 0, pad);
444 }
445 skb->protocol = __constant_htons(ETH_P_802_3);
446 }
447 if (!fr_hard_header(&skb, pvc->dlci)) {
448 stats->tx_bytes += skb->len;
449 stats->tx_packets++;
450 if (pvc->state.fecn) /* TX Congestion counter */
451 stats->tx_compressed++;
452 skb->dev = pvc->frad;
453 dev_queue_xmit(skb);
454 return 0;
455 }
456 }
457
458 stats->tx_dropped++;
459 dev_kfree_skb(skb);
460 return 0;
461 }
462
463
464
465 static int pvc_change_mtu(struct net_device *dev, int new_mtu)
466 {
467 if ((new_mtu < 68) || (new_mtu > HDLC_MAX_MTU))
468 return -EINVAL;
469 dev->mtu = new_mtu;
470 return 0;
471 }
472
473
474
475 static inline void fr_log_dlci_active(pvc_device *pvc)
476 {
477 printk(KERN_INFO "%s: DLCI %d [%s%s%s]%s %s\n",
478 pvc->frad->name,
479 pvc->dlci,
480 pvc->main ? pvc->main->name : "",
481 pvc->main && pvc->ether ? " " : "",
482 pvc->ether ? pvc->ether->name : "",
483 pvc->state.new ? " new" : "",
484 !pvc->state.exist ? "deleted" :
485 pvc->state.active ? "active" : "inactive");
486 }
487
488
489
490 static inline u8 fr_lmi_nextseq(u8 x)
491 {
492 x++;
493 return x ? x : 1;
494 }
495
496
497 static void fr_lmi_send(struct net_device *dev, int fullrep)
498 {
499 hdlc_device *hdlc = dev_to_hdlc(dev);
500 struct sk_buff *skb;
501 pvc_device *pvc = state(hdlc)->first_pvc;
502 int lmi = state(hdlc)->settings.lmi;
503 int dce = state(hdlc)->settings.dce;
504 int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
505 int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
506 u8 *data;
507 int i = 0;
508
509 if (dce && fullrep) {
510 len += state(hdlc)->dce_pvc_count * (2 + stat_len);
511 if (len > HDLC_MAX_MRU) {
512 printk(KERN_WARNING "%s: Too many PVCs while sending "
513 "LMI full report\n", dev->name);
514 return;
515 }
516 }
517
518 skb = dev_alloc_skb(len);
519 if (!skb) {
520 printk(KERN_WARNING "%s: Memory squeeze on fr_lmi_send()\n",
521 dev->name);
522 return;
523 }
524 memset(skb->data, 0, len);
525 skb_reserve(skb, 4);
526 if (lmi == LMI_CISCO) {
527 skb->protocol = __constant_htons(NLPID_CISCO_LMI);
528 fr_hard_header(&skb, LMI_CISCO_DLCI);
529 } else {
530 skb->protocol = __constant_htons(NLPID_CCITT_ANSI_LMI);
531 fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI);
532 }
533 data = skb_tail_pointer(skb);
534 data[i++] = LMI_CALLREF;
535 data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
536 if (lmi == LMI_ANSI)
537 data[i++] = LMI_ANSI_LOCKSHIFT;
538 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
539 LMI_ANSI_CISCO_REPTYPE;
540 data[i++] = LMI_REPT_LEN;
541 data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
542 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
543 data[i++] = LMI_INTEG_LEN;
544 data[i++] = state(hdlc)->txseq =
545 fr_lmi_nextseq(state(hdlc)->txseq);
546 data[i++] = state(hdlc)->rxseq;
547
548 if (dce && fullrep) {
549 while (pvc) {
550 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
551 LMI_ANSI_CISCO_PVCSTAT;
552 data[i++] = stat_len;
553
554 /* LMI start/restart */
555 if (state(hdlc)->reliable && !pvc->state.exist) {
556 pvc->state.exist = pvc->state.new = 1;
557 fr_log_dlci_active(pvc);
558 }
559
560 /* ifconfig PVC up */
561 if (pvc->open_count && !pvc->state.active &&
562 pvc->state.exist && !pvc->state.new) {
563 pvc_carrier(1, pvc);
564 pvc->state.active = 1;
565 fr_log_dlci_active(pvc);
566 }
567
568 if (lmi == LMI_CISCO) {
569 data[i] = pvc->dlci >> 8;
570 data[i + 1] = pvc->dlci & 0xFF;
571 } else {
572 data[i] = (pvc->dlci >> 4) & 0x3F;
573 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
574 data[i + 2] = 0x80;
575 }
576
577 if (pvc->state.new)
578 data[i + 2] |= 0x08;
579 else if (pvc->state.active)
580 data[i + 2] |= 0x02;
581
582 i += stat_len;
583 pvc = pvc->next;
584 }
585 }
586
587 skb_put(skb, i);
588 skb->priority = TC_PRIO_CONTROL;
589 skb->dev = dev;
590 skb_reset_network_header(skb);
591
592 dev_queue_xmit(skb);
593 }
594
595
596
597 static void fr_set_link_state(int reliable, struct net_device *dev)
598 {
599 hdlc_device *hdlc = dev_to_hdlc(dev);
600 pvc_device *pvc = state(hdlc)->first_pvc;
601
602 state(hdlc)->reliable = reliable;
603 if (reliable) {
604 netif_dormant_off(dev);
605 state(hdlc)->n391cnt = 0; /* Request full status */
606 state(hdlc)->dce_changed = 1;
607
608 if (state(hdlc)->settings.lmi == LMI_NONE) {
609 while (pvc) { /* Activate all PVCs */
610 pvc_carrier(1, pvc);
611 pvc->state.exist = pvc->state.active = 1;
612 pvc->state.new = 0;
613 pvc = pvc->next;
614 }
615 }
616 } else {
617 netif_dormant_on(dev);
618 while (pvc) { /* Deactivate all PVCs */
619 pvc_carrier(0, pvc);
620 pvc->state.exist = pvc->state.active = 0;
621 pvc->state.new = 0;
622 if (!state(hdlc)->settings.dce)
623 pvc->state.bandwidth = 0;
624 pvc = pvc->next;
625 }
626 }
627 }
628
629
630 static void fr_timer(unsigned long arg)
631 {
632 struct net_device *dev = (struct net_device *)arg;
633 hdlc_device *hdlc = dev_to_hdlc(dev);
634 int i, cnt = 0, reliable;
635 u32 list;
636
637 if (state(hdlc)->settings.dce) {
638 reliable = state(hdlc)->request &&
639 time_before(jiffies, state(hdlc)->last_poll +
640 state(hdlc)->settings.t392 * HZ);
641 state(hdlc)->request = 0;
642 } else {
643 state(hdlc)->last_errors <<= 1; /* Shift the list */
644 if (state(hdlc)->request) {
645 if (state(hdlc)->reliable)
646 printk(KERN_INFO "%s: No LMI status reply "
647 "received\n", dev->name);
648 state(hdlc)->last_errors |= 1;
649 }
650
651 list = state(hdlc)->last_errors;
652 for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1)
653 cnt += (list & 1); /* errors count */
654
655 reliable = (cnt < state(hdlc)->settings.n392);
656 }
657
658 if (state(hdlc)->reliable != reliable) {
659 printk(KERN_INFO "%s: Link %sreliable\n", dev->name,
660 reliable ? "" : "un");
661 fr_set_link_state(reliable, dev);
662 }
663
664 if (state(hdlc)->settings.dce)
665 state(hdlc)->timer.expires = jiffies +
666 state(hdlc)->settings.t392 * HZ;
667 else {
668 if (state(hdlc)->n391cnt)
669 state(hdlc)->n391cnt--;
670
671 fr_lmi_send(dev, state(hdlc)->n391cnt == 0);
672
673 state(hdlc)->last_poll = jiffies;
674 state(hdlc)->request = 1;
675 state(hdlc)->timer.expires = jiffies +
676 state(hdlc)->settings.t391 * HZ;
677 }
678
679 state(hdlc)->timer.function = fr_timer;
680 state(hdlc)->timer.data = arg;
681 add_timer(&state(hdlc)->timer);
682 }
683
684
685 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
686 {
687 hdlc_device *hdlc = dev_to_hdlc(dev);
688 pvc_device *pvc;
689 u8 rxseq, txseq;
690 int lmi = state(hdlc)->settings.lmi;
691 int dce = state(hdlc)->settings.dce;
692 int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;
693
694 if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
695 LMI_CCITT_CISCO_LENGTH)) {
696 printk(KERN_INFO "%s: Short LMI frame\n", dev->name);
697 return 1;
698 }
699
700 if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
701 NLPID_CCITT_ANSI_LMI)) {
702 printk(KERN_INFO "%s: Received non-LMI frame with LMI DLCI\n",
703 dev->name);
704 return 1;
705 }
706
707 if (skb->data[4] != LMI_CALLREF) {
708 printk(KERN_INFO "%s: Invalid LMI Call reference (0x%02X)\n",
709 dev->name, skb->data[4]);
710 return 1;
711 }
712
713 if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
714 printk(KERN_INFO "%s: Invalid LMI Message type (0x%02X)\n",
715 dev->name, skb->data[5]);
716 return 1;
717 }
718
719 if (lmi == LMI_ANSI) {
720 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
721 printk(KERN_INFO "%s: Not ANSI locking shift in LMI"
722 " message (0x%02X)\n", dev->name, skb->data[6]);
723 return 1;
724 }
725 i = 7;
726 } else
727 i = 6;
728
729 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
730 LMI_ANSI_CISCO_REPTYPE)) {
731 printk(KERN_INFO "%s: Not an LMI Report type IE (0x%02X)\n",
732 dev->name, skb->data[i]);
733 return 1;
734 }
735
736 if (skb->data[++i] != LMI_REPT_LEN) {
737 printk(KERN_INFO "%s: Invalid LMI Report type IE length"
738 " (%u)\n", dev->name, skb->data[i]);
739 return 1;
740 }
741
742 reptype = skb->data[++i];
743 if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
744 printk(KERN_INFO "%s: Unsupported LMI Report type (0x%02X)\n",
745 dev->name, reptype);
746 return 1;
747 }
748
749 if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
750 LMI_ANSI_CISCO_ALIVE)) {
751 printk(KERN_INFO "%s: Not an LMI Link integrity verification"
752 " IE (0x%02X)\n", dev->name, skb->data[i]);
753 return 1;
754 }
755
756 if (skb->data[++i] != LMI_INTEG_LEN) {
757 printk(KERN_INFO "%s: Invalid LMI Link integrity verification"
758 " IE length (%u)\n", dev->name, skb->data[i]);
759 return 1;
760 }
761 i++;
762
763 state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */
764 rxseq = skb->data[i++]; /* Should confirm our sequence */
765
766 txseq = state(hdlc)->txseq;
767
768 if (dce)
769 state(hdlc)->last_poll = jiffies;
770
771 error = 0;
772 if (!state(hdlc)->reliable)
773 error = 1;
774
775 if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */
776 state(hdlc)->n391cnt = 0;
777 error = 1;
778 }
779
780 if (dce) {
781 if (state(hdlc)->fullrep_sent && !error) {
782 /* Stop sending full report - the last one has been confirmed by DTE */
783 state(hdlc)->fullrep_sent = 0;
784 pvc = state(hdlc)->first_pvc;
785 while (pvc) {
786 if (pvc->state.new) {
787 pvc->state.new = 0;
788
789 /* Tell DTE that new PVC is now active */
790 state(hdlc)->dce_changed = 1;
791 }
792 pvc = pvc->next;
793 }
794 }
795
796 if (state(hdlc)->dce_changed) {
797 reptype = LMI_FULLREP;
798 state(hdlc)->fullrep_sent = 1;
799 state(hdlc)->dce_changed = 0;
800 }
801
802 state(hdlc)->request = 1; /* got request */
803 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
804 return 0;
805 }
806
807 /* DTE */
808
809 state(hdlc)->request = 0; /* got response, no request pending */
810
811 if (error)
812 return 0;
813
814 if (reptype != LMI_FULLREP)
815 return 0;
816
817 pvc = state(hdlc)->first_pvc;
818
819 while (pvc) {
820 pvc->state.deleted = 1;
821 pvc = pvc->next;
822 }
823
824 no_ram = 0;
825 while (skb->len >= i + 2 + stat_len) {
826 u16 dlci;
827 u32 bw;
828 unsigned int active, new;
829
830 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
831 LMI_ANSI_CISCO_PVCSTAT)) {
832 printk(KERN_INFO "%s: Not an LMI PVC status IE"
833 " (0x%02X)\n", dev->name, skb->data[i]);
834 return 1;
835 }
836
837 if (skb->data[++i] != stat_len) {
838 printk(KERN_INFO "%s: Invalid LMI PVC status IE length"
839 " (%u)\n", dev->name, skb->data[i]);
840 return 1;
841 }
842 i++;
843
844 new = !! (skb->data[i + 2] & 0x08);
845 active = !! (skb->data[i + 2] & 0x02);
846 if (lmi == LMI_CISCO) {
847 dlci = (skb->data[i] << 8) | skb->data[i + 1];
848 bw = (skb->data[i + 3] << 16) |
849 (skb->data[i + 4] << 8) |
850 (skb->data[i + 5]);
851 } else {
852 dlci = ((skb->data[i] & 0x3F) << 4) |
853 ((skb->data[i + 1] & 0x78) >> 3);
854 bw = 0;
855 }
856
857 pvc = add_pvc(dev, dlci);
858
859 if (!pvc && !no_ram) {
860 printk(KERN_WARNING
861 "%s: Memory squeeze on fr_lmi_recv()\n",
862 dev->name);
863 no_ram = 1;
864 }
865
866 if (pvc) {
867 pvc->state.exist = 1;
868 pvc->state.deleted = 0;
869 if (active != pvc->state.active ||
870 new != pvc->state.new ||
871 bw != pvc->state.bandwidth ||
872 !pvc->state.exist) {
873 pvc->state.new = new;
874 pvc->state.active = active;
875 pvc->state.bandwidth = bw;
876 pvc_carrier(active, pvc);
877 fr_log_dlci_active(pvc);
878 }
879 }
880
881 i += stat_len;
882 }
883
884 pvc = state(hdlc)->first_pvc;
885
886 while (pvc) {
887 if (pvc->state.deleted && pvc->state.exist) {
888 pvc_carrier(0, pvc);
889 pvc->state.active = pvc->state.new = 0;
890 pvc->state.exist = 0;
891 pvc->state.bandwidth = 0;
892 fr_log_dlci_active(pvc);
893 }
894 pvc = pvc->next;
895 }
896
897 /* Next full report after N391 polls */
898 state(hdlc)->n391cnt = state(hdlc)->settings.n391;
899
900 return 0;
901 }
902
903
904 static int fr_rx(struct sk_buff *skb)
905 {
906 struct net_device *frad = skb->dev;
907 hdlc_device *hdlc = dev_to_hdlc(frad);
908 fr_hdr *fh = (fr_hdr*)skb->data;
909 u8 *data = skb->data;
910 u16 dlci;
911 pvc_device *pvc;
912 struct net_device *dev = NULL;
913
914 if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
915 goto rx_error;
916
917 dlci = q922_to_dlci(skb->data);
918
919 if ((dlci == LMI_CCITT_ANSI_DLCI &&
920 (state(hdlc)->settings.lmi == LMI_ANSI ||
921 state(hdlc)->settings.lmi == LMI_CCITT)) ||
922 (dlci == LMI_CISCO_DLCI &&
923 state(hdlc)->settings.lmi == LMI_CISCO)) {
924 if (fr_lmi_recv(frad, skb))
925 goto rx_error;
926 dev_kfree_skb_any(skb);
927 return NET_RX_SUCCESS;
928 }
929
930 pvc = find_pvc(hdlc, dlci);
931 if (!pvc) {
932 #ifdef DEBUG_PKT
933 printk(KERN_INFO "%s: No PVC for received frame's DLCI %d\n",
934 frad->name, dlci);
935 #endif
936 dev_kfree_skb_any(skb);
937 return NET_RX_DROP;
938 }
939
940 if (pvc->state.fecn != fh->fecn) {
941 #ifdef DEBUG_ECN
942 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name,
943 dlci, fh->fecn ? "N" : "FF");
944 #endif
945 pvc->state.fecn ^= 1;
946 }
947
948 if (pvc->state.becn != fh->becn) {
949 #ifdef DEBUG_ECN
950 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name,
951 dlci, fh->becn ? "N" : "FF");
952 #endif
953 pvc->state.becn ^= 1;
954 }
955
956
957 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
958 dev_to_hdlc(frad)->stats.rx_dropped++;
959 return NET_RX_DROP;
960 }
961
962 if (data[3] == NLPID_IP) {
963 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
964 dev = pvc->main;
965 skb->protocol = htons(ETH_P_IP);
966
967 } else if (data[3] == NLPID_IPV6) {
968 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
969 dev = pvc->main;
970 skb->protocol = htons(ETH_P_IPV6);
971
972 } else if (skb->len > 10 && data[3] == FR_PAD &&
973 data[4] == NLPID_SNAP && data[5] == FR_PAD) {
974 u16 oui = ntohs(*(__be16*)(data + 6));
975 u16 pid = ntohs(*(__be16*)(data + 8));
976 skb_pull(skb, 10);
977
978 switch ((((u32)oui) << 16) | pid) {
979 case ETH_P_ARP: /* routed frame with SNAP */
980 case ETH_P_IPX:
981 case ETH_P_IP: /* a long variant */
982 case ETH_P_IPV6:
983 dev = pvc->main;
984 skb->protocol = htons(pid);
985 break;
986
987 case 0x80C20007: /* bridged Ethernet frame */
988 if ((dev = pvc->ether) != NULL)
989 skb->protocol = eth_type_trans(skb, dev);
990 break;
991
992 default:
993 printk(KERN_INFO "%s: Unsupported protocol, OUI=%x "
994 "PID=%x\n", frad->name, oui, pid);
995 dev_kfree_skb_any(skb);
996 return NET_RX_DROP;
997 }
998 } else {
999 printk(KERN_INFO "%s: Unsupported protocol, NLPID=%x "
1000 "length = %i\n", frad->name, data[3], skb->len);
1001 dev_kfree_skb_any(skb);
1002 return NET_RX_DROP;
1003 }
1004
1005 if (dev) {
1006 struct net_device_stats *stats = pvc_get_stats(dev);
1007 stats->rx_packets++; /* PVC traffic */
1008 stats->rx_bytes += skb->len;
1009 if (pvc->state.becn)
1010 stats->rx_compressed++;
1011 netif_rx(skb);
1012 return NET_RX_SUCCESS;
1013 } else {
1014 dev_kfree_skb_any(skb);
1015 return NET_RX_DROP;
1016 }
1017
1018 rx_error:
1019 dev_to_hdlc(frad)->stats.rx_errors++; /* Mark error */
1020 dev_kfree_skb_any(skb);
1021 return NET_RX_DROP;
1022 }
1023
1024
1025
1026 static void fr_start(struct net_device *dev)
1027 {
1028 hdlc_device *hdlc = dev_to_hdlc(dev);
1029 #ifdef DEBUG_LINK
1030 printk(KERN_DEBUG "fr_start\n");
1031 #endif
1032 if (state(hdlc)->settings.lmi != LMI_NONE) {
1033 state(hdlc)->reliable = 0;
1034 state(hdlc)->dce_changed = 1;
1035 state(hdlc)->request = 0;
1036 state(hdlc)->fullrep_sent = 0;
1037 state(hdlc)->last_errors = 0xFFFFFFFF;
1038 state(hdlc)->n391cnt = 0;
1039 state(hdlc)->txseq = state(hdlc)->rxseq = 0;
1040
1041 init_timer(&state(hdlc)->timer);
1042 /* First poll after 1 s */
1043 state(hdlc)->timer.expires = jiffies + HZ;
1044 state(hdlc)->timer.function = fr_timer;
1045 state(hdlc)->timer.data = (unsigned long)dev;
1046 add_timer(&state(hdlc)->timer);
1047 } else
1048 fr_set_link_state(1, dev);
1049 }
1050
1051
1052 static void fr_stop(struct net_device *dev)
1053 {
1054 hdlc_device *hdlc = dev_to_hdlc(dev);
1055 #ifdef DEBUG_LINK
1056 printk(KERN_DEBUG "fr_stop\n");
1057 #endif
1058 if (state(hdlc)->settings.lmi != LMI_NONE)
1059 del_timer_sync(&state(hdlc)->timer);
1060 fr_set_link_state(0, dev);
1061 }
1062
1063
1064 static void fr_close(struct net_device *dev)
1065 {
1066 hdlc_device *hdlc = dev_to_hdlc(dev);
1067 pvc_device *pvc = state(hdlc)->first_pvc;
1068
1069 while (pvc) { /* Shutdown all PVCs for this FRAD */
1070 if (pvc->main)
1071 dev_close(pvc->main);
1072 if (pvc->ether)
1073 dev_close(pvc->ether);
1074 pvc = pvc->next;
1075 }
1076 }
1077
1078
1079 static void pvc_setup(struct net_device *dev)
1080 {
1081 dev->type = ARPHRD_DLCI;
1082 dev->flags = IFF_POINTOPOINT;
1083 dev->hard_header_len = 10;
1084 dev->addr_len = 2;
1085 }
1086
1087 static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
1088 {
1089 hdlc_device *hdlc = dev_to_hdlc(frad);
1090 pvc_device *pvc = NULL;
1091 struct net_device *dev;
1092 int result, used;
1093 char * prefix = "pvc%d";
1094
1095 if (type == ARPHRD_ETHER)
1096 prefix = "pvceth%d";
1097
1098 if ((pvc = add_pvc(frad, dlci)) == NULL) {
1099 printk(KERN_WARNING "%s: Memory squeeze on fr_add_pvc()\n",
1100 frad->name);
1101 return -ENOBUFS;
1102 }
1103
1104 if (*get_dev_p(pvc, type))
1105 return -EEXIST;
1106
1107 used = pvc_is_used(pvc);
1108
1109 if (type == ARPHRD_ETHER)
1110 dev = alloc_netdev(sizeof(struct pvc_desc), "pvceth%d",
1111 ether_setup);
1112 else
1113 dev = alloc_netdev(sizeof(struct pvc_desc), "pvc%d", pvc_setup);
1114
1115 if (!dev) {
1116 printk(KERN_WARNING "%s: Memory squeeze on fr_pvc()\n",
1117 frad->name);
1118 delete_unused_pvcs(hdlc);
1119 return -ENOBUFS;
1120 }
1121
1122 if (type == ARPHRD_ETHER)
1123 random_ether_addr(dev->dev_addr);
1124 else {
1125 *(__be16*)dev->dev_addr = htons(dlci);
1126 dlci_to_q922(dev->broadcast, dlci);
1127 }
1128 dev->hard_start_xmit = pvc_xmit;
1129 dev->get_stats = pvc_get_stats;
1130 dev->open = pvc_open;
1131 dev->stop = pvc_close;
1132 dev->do_ioctl = pvc_ioctl;
1133 dev->change_mtu = pvc_change_mtu;
1134 dev->mtu = HDLC_MAX_MTU;
1135 dev->tx_queue_len = 0;
1136 pvcdev_to_desc(dev)->pvc = pvc;
1137
1138 result = dev_alloc_name(dev, dev->name);
1139 if (result < 0) {
1140 free_netdev(dev);
1141 delete_unused_pvcs(hdlc);
1142 return result;
1143 }
1144
1145 if (register_netdevice(dev) != 0) {
1146 free_netdev(dev);
1147 delete_unused_pvcs(hdlc);
1148 return -EIO;
1149 }
1150
1151 dev->destructor = free_netdev;
1152 *get_dev_p(pvc, type) = dev;
1153 if (!used) {
1154 state(hdlc)->dce_changed = 1;
1155 state(hdlc)->dce_pvc_count++;
1156 }
1157 return 0;
1158 }
1159
1160
1161
1162 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
1163 {
1164 pvc_device *pvc;
1165 struct net_device *dev;
1166
1167 if ((pvc = find_pvc(hdlc, dlci)) == NULL)
1168 return -ENOENT;
1169
1170 if ((dev = *get_dev_p(pvc, type)) == NULL)
1171 return -ENOENT;
1172
1173 if (dev->flags & IFF_UP)
1174 return -EBUSY; /* PVC in use */
1175
1176 unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
1177 *get_dev_p(pvc, type) = NULL;
1178
1179 if (!pvc_is_used(pvc)) {
1180 state(hdlc)->dce_pvc_count--;
1181 state(hdlc)->dce_changed = 1;
1182 }
1183 delete_unused_pvcs(hdlc);
1184 return 0;
1185 }
1186
1187
1188
1189 static void fr_destroy(struct net_device *frad)
1190 {
1191 hdlc_device *hdlc = dev_to_hdlc(frad);
1192 pvc_device *pvc = state(hdlc)->first_pvc;
1193 state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */
1194 state(hdlc)->dce_pvc_count = 0;
1195 state(hdlc)->dce_changed = 1;
1196
1197 while (pvc) {
1198 pvc_device *next = pvc->next;
1199 /* destructors will free_netdev() main and ether */
1200 if (pvc->main)
1201 unregister_netdevice(pvc->main);
1202
1203 if (pvc->ether)
1204 unregister_netdevice(pvc->ether);
1205
1206 kfree(pvc);
1207 pvc = next;
1208 }
1209 }
1210
1211
1212 static struct hdlc_proto proto = {
1213 .close = fr_close,
1214 .start = fr_start,
1215 .stop = fr_stop,
1216 .detach = fr_destroy,
1217 .ioctl = fr_ioctl,
1218 .netif_rx = fr_rx,
1219 .module = THIS_MODULE,
1220 };
1221
1222
1223 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr)
1224 {
1225 fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
1226 const size_t size = sizeof(fr_proto);
1227 fr_proto new_settings;
1228 hdlc_device *hdlc = dev_to_hdlc(dev);
1229 fr_proto_pvc pvc;
1230 int result;
1231
1232 switch (ifr->ifr_settings.type) {
1233 case IF_GET_PROTO:
1234 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1235 return -EINVAL;
1236 ifr->ifr_settings.type = IF_PROTO_FR;
1237 if (ifr->ifr_settings.size < size) {
1238 ifr->ifr_settings.size = size; /* data size wanted */
1239 return -ENOBUFS;
1240 }
1241 if (copy_to_user(fr_s, &state(hdlc)->settings, size))
1242 return -EFAULT;
1243 return 0;
1244
1245 case IF_PROTO_FR:
1246 if(!capable(CAP_NET_ADMIN))
1247 return -EPERM;
1248
1249 if(dev->flags & IFF_UP)
1250 return -EBUSY;
1251
1252 if (copy_from_user(&new_settings, fr_s, size))
1253 return -EFAULT;
1254
1255 if (new_settings.lmi == LMI_DEFAULT)
1256 new_settings.lmi = LMI_ANSI;
1257
1258 if ((new_settings.lmi != LMI_NONE &&
1259 new_settings.lmi != LMI_ANSI &&
1260 new_settings.lmi != LMI_CCITT &&
1261 new_settings.lmi != LMI_CISCO) ||
1262 new_settings.t391 < 1 ||
1263 new_settings.t392 < 2 ||
1264 new_settings.n391 < 1 ||
1265 new_settings.n392 < 1 ||
1266 new_settings.n393 < new_settings.n392 ||
1267 new_settings.n393 > 32 ||
1268 (new_settings.dce != 0 &&
1269 new_settings.dce != 1))
1270 return -EINVAL;
1271
1272 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1273 if (result)
1274 return result;
1275
1276 if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */
1277 result = attach_hdlc_protocol(dev, &proto,
1278 sizeof(struct frad_state));
1279 if (result)
1280 return result;
1281 state(hdlc)->first_pvc = NULL;
1282 state(hdlc)->dce_pvc_count = 0;
1283 }
1284 memcpy(&state(hdlc)->settings, &new_settings, size);
1285
1286 dev->hard_start_xmit = hdlc->xmit;
1287 dev->type = ARPHRD_FRAD;
1288 return 0;
1289
1290 case IF_PROTO_FR_ADD_PVC:
1291 case IF_PROTO_FR_DEL_PVC:
1292 case IF_PROTO_FR_ADD_ETH_PVC:
1293 case IF_PROTO_FR_DEL_ETH_PVC:
1294 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1295 return -EINVAL;
1296
1297 if(!capable(CAP_NET_ADMIN))
1298 return -EPERM;
1299
1300 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
1301 sizeof(fr_proto_pvc)))
1302 return -EFAULT;
1303
1304 if (pvc.dlci <= 0 || pvc.dlci >= 1024)
1305 return -EINVAL; /* Only 10 bits, DLCI 0 reserved */
1306
1307 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
1308 ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
1309 result = ARPHRD_ETHER; /* bridged Ethernet device */
1310 else
1311 result = ARPHRD_DLCI;
1312
1313 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
1314 ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
1315 return fr_add_pvc(dev, pvc.dlci, result);
1316 else
1317 return fr_del_pvc(hdlc, pvc.dlci, result);
1318 }
1319
1320 return -EINVAL;
1321 }
1322
1323
1324 static int __init mod_init(void)
1325 {
1326 register_hdlc_protocol(&proto);
1327 return 0;
1328 }
1329
1330
1331 static void __exit mod_exit(void)
1332 {
1333 unregister_hdlc_protocol(&proto);
1334 }
1335
1336
1337 module_init(mod_init);
1338 module_exit(mod_exit);
1339
1340 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
1341 MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC");
1342 MODULE_LICENSE("GPL v2");
WRT350N Kernel Patches