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WAN: Remove no longer needed pvc_desc in FR code.
[linux-2.6/mini2440.git] / drivers / net / wan / hdlc_fr.c
blob109bab34094d7c52cbbd5c2a41c3c13a4ef11185
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 frad_state {
139 fr_proto settings;
140 pvc_device *first_pvc;
141 int dce_pvc_count;
142
143 struct timer_list timer;
144 unsigned long last_poll;
145 int reliable;
146 int dce_changed;
147 int request;
148 int fullrep_sent;
149 u32 last_errors; /* last errors bit list */
150 u8 n391cnt;
151 u8 txseq; /* TX sequence number */
152 u8 rxseq; /* RX sequence number */
153 };
154
155
156 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr);
157
158
159 static inline u16 q922_to_dlci(u8 *hdr)
160 {
161 return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
162 }
163
164
165 static inline void dlci_to_q922(u8 *hdr, u16 dlci)
166 {
167 hdr[0] = (dlci >> 2) & 0xFC;
168 hdr[1] = ((dlci << 4) & 0xF0) | 0x01;
169 }
170
171
172 static inline struct frad_state* state(hdlc_device *hdlc)
173 {
174 return(struct frad_state *)(hdlc->state);
175 }
176
177
178 static inline pvc_device* find_pvc(hdlc_device *hdlc, u16 dlci)
179 {
180 pvc_device *pvc = state(hdlc)->first_pvc;
181
182 while (pvc) {
183 if (pvc->dlci == dlci)
184 return pvc;
185 if (pvc->dlci > dlci)
186 return NULL; /* the listed is sorted */
187 pvc = pvc->next;
188 }
189
190 return NULL;
191 }
192
193
194 static pvc_device* add_pvc(struct net_device *dev, u16 dlci)
195 {
196 hdlc_device *hdlc = dev_to_hdlc(dev);
197 pvc_device *pvc, **pvc_p = &state(hdlc)->first_pvc;
198
199 while (*pvc_p) {
200 if ((*pvc_p)->dlci == dlci)
201 return *pvc_p;
202 if ((*pvc_p)->dlci > dlci)
203 break; /* the list is sorted */
204 pvc_p = &(*pvc_p)->next;
205 }
206
207 pvc = kzalloc(sizeof(pvc_device), GFP_ATOMIC);
208 #ifdef DEBUG_PVC
209 printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev);
210 #endif
211 if (!pvc)
212 return NULL;
213
214 pvc->dlci = dlci;
215 pvc->frad = dev;
216 pvc->next = *pvc_p; /* Put it in the chain */
217 *pvc_p = pvc;
218 return pvc;
219 }
220
221
222 static inline int pvc_is_used(pvc_device *pvc)
223 {
224 return pvc->main || pvc->ether;
225 }
226
227
228 static inline void pvc_carrier(int on, pvc_device *pvc)
229 {
230 if (on) {
231 if (pvc->main)
232 if (!netif_carrier_ok(pvc->main))
233 netif_carrier_on(pvc->main);
234 if (pvc->ether)
235 if (!netif_carrier_ok(pvc->ether))
236 netif_carrier_on(pvc->ether);
237 } else {
238 if (pvc->main)
239 if (netif_carrier_ok(pvc->main))
240 netif_carrier_off(pvc->main);
241 if (pvc->ether)
242 if (netif_carrier_ok(pvc->ether))
243 netif_carrier_off(pvc->ether);
244 }
245 }
246
247
248 static inline void delete_unused_pvcs(hdlc_device *hdlc)
249 {
250 pvc_device **pvc_p = &state(hdlc)->first_pvc;
251
252 while (*pvc_p) {
253 if (!pvc_is_used(*pvc_p)) {
254 pvc_device *pvc = *pvc_p;
255 #ifdef DEBUG_PVC
256 printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc);
257 #endif
258 *pvc_p = pvc->next;
259 kfree(pvc);
260 continue;
261 }
262 pvc_p = &(*pvc_p)->next;
263 }
264 }
265
266
267 static inline struct net_device** get_dev_p(pvc_device *pvc, int type)
268 {
269 if (type == ARPHRD_ETHER)
270 return &pvc->ether;
271 else
272 return &pvc->main;
273 }
274
275
276 static int fr_hard_header(struct sk_buff **skb_p, u16 dlci)
277 {
278 u16 head_len;
279 struct sk_buff *skb = *skb_p;
280
281 switch (skb->protocol) {
282 case __constant_htons(NLPID_CCITT_ANSI_LMI):
283 head_len = 4;
284 skb_push(skb, head_len);
285 skb->data[3] = NLPID_CCITT_ANSI_LMI;
286 break;
287
288 case __constant_htons(NLPID_CISCO_LMI):
289 head_len = 4;
290 skb_push(skb, head_len);
291 skb->data[3] = NLPID_CISCO_LMI;
292 break;
293
294 case __constant_htons(ETH_P_IP):
295 head_len = 4;
296 skb_push(skb, head_len);
297 skb->data[3] = NLPID_IP;
298 break;
299
300 case __constant_htons(ETH_P_IPV6):
301 head_len = 4;
302 skb_push(skb, head_len);
303 skb->data[3] = NLPID_IPV6;
304 break;
305
306 case __constant_htons(ETH_P_802_3):
307 head_len = 10;
308 if (skb_headroom(skb) < head_len) {
309 struct sk_buff *skb2 = skb_realloc_headroom(skb,
310 head_len);
311 if (!skb2)
312 return -ENOBUFS;
313 dev_kfree_skb(skb);
314 skb = *skb_p = skb2;
315 }
316 skb_push(skb, head_len);
317 skb->data[3] = FR_PAD;
318 skb->data[4] = NLPID_SNAP;
319 skb->data[5] = FR_PAD;
320 skb->data[6] = 0x80;
321 skb->data[7] = 0xC2;
322 skb->data[8] = 0x00;
323 skb->data[9] = 0x07; /* bridged Ethernet frame w/out FCS */
324 break;
325
326 default:
327 head_len = 10;
328 skb_push(skb, head_len);
329 skb->data[3] = FR_PAD;
330 skb->data[4] = NLPID_SNAP;
331 skb->data[5] = FR_PAD;
332 skb->data[6] = FR_PAD;
333 skb->data[7] = FR_PAD;
334 *(__be16*)(skb->data + 8) = skb->protocol;
335 }
336
337 dlci_to_q922(skb->data, dlci);
338 skb->data[2] = FR_UI;
339 return 0;
340 }
341
342
343
344 static int pvc_open(struct net_device *dev)
345 {
346 pvc_device *pvc = dev->priv;
347
348 if ((pvc->frad->flags & IFF_UP) == 0)
349 return -EIO; /* Frad must be UP in order to activate PVC */
350
351 if (pvc->open_count++ == 0) {
352 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
353 if (state(hdlc)->settings.lmi == LMI_NONE)
354 pvc->state.active = netif_carrier_ok(pvc->frad);
355
356 pvc_carrier(pvc->state.active, pvc);
357 state(hdlc)->dce_changed = 1;
358 }
359 return 0;
360 }
361
362
363
364 static int pvc_close(struct net_device *dev)
365 {
366 pvc_device *pvc = dev->priv;
367
368 if (--pvc->open_count == 0) {
369 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
370 if (state(hdlc)->settings.lmi == LMI_NONE)
371 pvc->state.active = 0;
372
373 if (state(hdlc)->settings.dce) {
374 state(hdlc)->dce_changed = 1;
375 pvc->state.active = 0;
376 }
377 }
378 return 0;
379 }
380
381
382
383 static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
384 {
385 pvc_device *pvc = dev->priv;
386 fr_proto_pvc_info info;
387
388 if (ifr->ifr_settings.type == IF_GET_PROTO) {
389 if (dev->type == ARPHRD_ETHER)
390 ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
391 else
392 ifr->ifr_settings.type = IF_PROTO_FR_PVC;
393
394 if (ifr->ifr_settings.size < sizeof(info)) {
395 /* data size wanted */
396 ifr->ifr_settings.size = sizeof(info);
397 return -ENOBUFS;
398 }
399
400 info.dlci = pvc->dlci;
401 memcpy(info.master, pvc->frad->name, IFNAMSIZ);
402 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
403 &info, sizeof(info)))
404 return -EFAULT;
405 return 0;
406 }
407
408 return -EINVAL;
409 }
410
411 static int pvc_xmit(struct sk_buff *skb, struct net_device *dev)
412 {
413 pvc_device *pvc = dev->priv;
414
415 if (pvc->state.active) {
416 if (dev->type == ARPHRD_ETHER) {
417 int pad = ETH_ZLEN - skb->len;
418 if (pad > 0) { /* Pad the frame with zeros */
419 int len = skb->len;
420 if (skb_tailroom(skb) < pad)
421 if (pskb_expand_head(skb, 0, pad,
422 GFP_ATOMIC)) {
423 dev->stats.tx_dropped++;
424 dev_kfree_skb(skb);
425 return 0;
426 }
427 skb_put(skb, pad);
428 memset(skb->data + len, 0, pad);
429 }
430 skb->protocol = __constant_htons(ETH_P_802_3);
431 }
432 if (!fr_hard_header(&skb, pvc->dlci)) {
433 dev->stats.tx_bytes += skb->len;
434 dev->stats.tx_packets++;
435 if (pvc->state.fecn) /* TX Congestion counter */
436 dev->stats.tx_compressed++;
437 skb->dev = pvc->frad;
438 dev_queue_xmit(skb);
439 return 0;
440 }
441 }
442
443 dev->stats.tx_dropped++;
444 dev_kfree_skb(skb);
445 return 0;
446 }
447
448
449
450 static int pvc_change_mtu(struct net_device *dev, int new_mtu)
451 {
452 if ((new_mtu < 68) || (new_mtu > HDLC_MAX_MTU))
453 return -EINVAL;
454 dev->mtu = new_mtu;
455 return 0;
456 }
457
458
459
460 static inline void fr_log_dlci_active(pvc_device *pvc)
461 {
462 printk(KERN_INFO "%s: DLCI %d [%s%s%s]%s %s\n",
463 pvc->frad->name,
464 pvc->dlci,
465 pvc->main ? pvc->main->name : "",
466 pvc->main && pvc->ether ? " " : "",
467 pvc->ether ? pvc->ether->name : "",
468 pvc->state.new ? " new" : "",
469 !pvc->state.exist ? "deleted" :
470 pvc->state.active ? "active" : "inactive");
471 }
472
473
474
475 static inline u8 fr_lmi_nextseq(u8 x)
476 {
477 x++;
478 return x ? x : 1;
479 }
480
481
482 static void fr_lmi_send(struct net_device *dev, int fullrep)
483 {
484 hdlc_device *hdlc = dev_to_hdlc(dev);
485 struct sk_buff *skb;
486 pvc_device *pvc = state(hdlc)->first_pvc;
487 int lmi = state(hdlc)->settings.lmi;
488 int dce = state(hdlc)->settings.dce;
489 int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
490 int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
491 u8 *data;
492 int i = 0;
493
494 if (dce && fullrep) {
495 len += state(hdlc)->dce_pvc_count * (2 + stat_len);
496 if (len > HDLC_MAX_MRU) {
497 printk(KERN_WARNING "%s: Too many PVCs while sending "
498 "LMI full report\n", dev->name);
499 return;
500 }
501 }
502
503 skb = dev_alloc_skb(len);
504 if (!skb) {
505 printk(KERN_WARNING "%s: Memory squeeze on fr_lmi_send()\n",
506 dev->name);
507 return;
508 }
509 memset(skb->data, 0, len);
510 skb_reserve(skb, 4);
511 if (lmi == LMI_CISCO) {
512 skb->protocol = __constant_htons(NLPID_CISCO_LMI);
513 fr_hard_header(&skb, LMI_CISCO_DLCI);
514 } else {
515 skb->protocol = __constant_htons(NLPID_CCITT_ANSI_LMI);
516 fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI);
517 }
518 data = skb_tail_pointer(skb);
519 data[i++] = LMI_CALLREF;
520 data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
521 if (lmi == LMI_ANSI)
522 data[i++] = LMI_ANSI_LOCKSHIFT;
523 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
524 LMI_ANSI_CISCO_REPTYPE;
525 data[i++] = LMI_REPT_LEN;
526 data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
527 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
528 data[i++] = LMI_INTEG_LEN;
529 data[i++] = state(hdlc)->txseq =
530 fr_lmi_nextseq(state(hdlc)->txseq);
531 data[i++] = state(hdlc)->rxseq;
532
533 if (dce && fullrep) {
534 while (pvc) {
535 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
536 LMI_ANSI_CISCO_PVCSTAT;
537 data[i++] = stat_len;
538
539 /* LMI start/restart */
540 if (state(hdlc)->reliable && !pvc->state.exist) {
541 pvc->state.exist = pvc->state.new = 1;
542 fr_log_dlci_active(pvc);
543 }
544
545 /* ifconfig PVC up */
546 if (pvc->open_count && !pvc->state.active &&
547 pvc->state.exist && !pvc->state.new) {
548 pvc_carrier(1, pvc);
549 pvc->state.active = 1;
550 fr_log_dlci_active(pvc);
551 }
552
553 if (lmi == LMI_CISCO) {
554 data[i] = pvc->dlci >> 8;
555 data[i + 1] = pvc->dlci & 0xFF;
556 } else {
557 data[i] = (pvc->dlci >> 4) & 0x3F;
558 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
559 data[i + 2] = 0x80;
560 }
561
562 if (pvc->state.new)
563 data[i + 2] |= 0x08;
564 else if (pvc->state.active)
565 data[i + 2] |= 0x02;
566
567 i += stat_len;
568 pvc = pvc->next;
569 }
570 }
571
572 skb_put(skb, i);
573 skb->priority = TC_PRIO_CONTROL;
574 skb->dev = dev;
575 skb_reset_network_header(skb);
576
577 dev_queue_xmit(skb);
578 }
579
580
581
582 static void fr_set_link_state(int reliable, struct net_device *dev)
583 {
584 hdlc_device *hdlc = dev_to_hdlc(dev);
585 pvc_device *pvc = state(hdlc)->first_pvc;
586
587 state(hdlc)->reliable = reliable;
588 if (reliable) {
589 netif_dormant_off(dev);
590 state(hdlc)->n391cnt = 0; /* Request full status */
591 state(hdlc)->dce_changed = 1;
592
593 if (state(hdlc)->settings.lmi == LMI_NONE) {
594 while (pvc) { /* Activate all PVCs */
595 pvc_carrier(1, pvc);
596 pvc->state.exist = pvc->state.active = 1;
597 pvc->state.new = 0;
598 pvc = pvc->next;
599 }
600 }
601 } else {
602 netif_dormant_on(dev);
603 while (pvc) { /* Deactivate all PVCs */
604 pvc_carrier(0, pvc);
605 pvc->state.exist = pvc->state.active = 0;
606 pvc->state.new = 0;
607 if (!state(hdlc)->settings.dce)
608 pvc->state.bandwidth = 0;
609 pvc = pvc->next;
610 }
611 }
612 }
613
614
615 static void fr_timer(unsigned long arg)
616 {
617 struct net_device *dev = (struct net_device *)arg;
618 hdlc_device *hdlc = dev_to_hdlc(dev);
619 int i, cnt = 0, reliable;
620 u32 list;
621
622 if (state(hdlc)->settings.dce) {
623 reliable = state(hdlc)->request &&
624 time_before(jiffies, state(hdlc)->last_poll +
625 state(hdlc)->settings.t392 * HZ);
626 state(hdlc)->request = 0;
627 } else {
628 state(hdlc)->last_errors <<= 1; /* Shift the list */
629 if (state(hdlc)->request) {
630 if (state(hdlc)->reliable)
631 printk(KERN_INFO "%s: No LMI status reply "
632 "received\n", dev->name);
633 state(hdlc)->last_errors |= 1;
634 }
635
636 list = state(hdlc)->last_errors;
637 for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1)
638 cnt += (list & 1); /* errors count */
639
640 reliable = (cnt < state(hdlc)->settings.n392);
641 }
642
643 if (state(hdlc)->reliable != reliable) {
644 printk(KERN_INFO "%s: Link %sreliable\n", dev->name,
645 reliable ? "" : "un");
646 fr_set_link_state(reliable, dev);
647 }
648
649 if (state(hdlc)->settings.dce)
650 state(hdlc)->timer.expires = jiffies +
651 state(hdlc)->settings.t392 * HZ;
652 else {
653 if (state(hdlc)->n391cnt)
654 state(hdlc)->n391cnt--;
655
656 fr_lmi_send(dev, state(hdlc)->n391cnt == 0);
657
658 state(hdlc)->last_poll = jiffies;
659 state(hdlc)->request = 1;
660 state(hdlc)->timer.expires = jiffies +
661 state(hdlc)->settings.t391 * HZ;
662 }
663
664 state(hdlc)->timer.function = fr_timer;
665 state(hdlc)->timer.data = arg;
666 add_timer(&state(hdlc)->timer);
667 }
668
669
670 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
671 {
672 hdlc_device *hdlc = dev_to_hdlc(dev);
673 pvc_device *pvc;
674 u8 rxseq, txseq;
675 int lmi = state(hdlc)->settings.lmi;
676 int dce = state(hdlc)->settings.dce;
677 int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;
678
679 if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
680 LMI_CCITT_CISCO_LENGTH)) {
681 printk(KERN_INFO "%s: Short LMI frame\n", dev->name);
682 return 1;
683 }
684
685 if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
686 NLPID_CCITT_ANSI_LMI)) {
687 printk(KERN_INFO "%s: Received non-LMI frame with LMI DLCI\n",
688 dev->name);
689 return 1;
690 }
691
692 if (skb->data[4] != LMI_CALLREF) {
693 printk(KERN_INFO "%s: Invalid LMI Call reference (0x%02X)\n",
694 dev->name, skb->data[4]);
695 return 1;
696 }
697
698 if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
699 printk(KERN_INFO "%s: Invalid LMI Message type (0x%02X)\n",
700 dev->name, skb->data[5]);
701 return 1;
702 }
703
704 if (lmi == LMI_ANSI) {
705 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
706 printk(KERN_INFO "%s: Not ANSI locking shift in LMI"
707 " message (0x%02X)\n", dev->name, skb->data[6]);
708 return 1;
709 }
710 i = 7;
711 } else
712 i = 6;
713
714 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
715 LMI_ANSI_CISCO_REPTYPE)) {
716 printk(KERN_INFO "%s: Not an LMI Report type IE (0x%02X)\n",
717 dev->name, skb->data[i]);
718 return 1;
719 }
720
721 if (skb->data[++i] != LMI_REPT_LEN) {
722 printk(KERN_INFO "%s: Invalid LMI Report type IE length"
723 " (%u)\n", dev->name, skb->data[i]);
724 return 1;
725 }
726
727 reptype = skb->data[++i];
728 if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
729 printk(KERN_INFO "%s: Unsupported LMI Report type (0x%02X)\n",
730 dev->name, reptype);
731 return 1;
732 }
733
734 if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
735 LMI_ANSI_CISCO_ALIVE)) {
736 printk(KERN_INFO "%s: Not an LMI Link integrity verification"
737 " IE (0x%02X)\n", dev->name, skb->data[i]);
738 return 1;
739 }
740
741 if (skb->data[++i] != LMI_INTEG_LEN) {
742 printk(KERN_INFO "%s: Invalid LMI Link integrity verification"
743 " IE length (%u)\n", dev->name, skb->data[i]);
744 return 1;
745 }
746 i++;
747
748 state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */
749 rxseq = skb->data[i++]; /* Should confirm our sequence */
750
751 txseq = state(hdlc)->txseq;
752
753 if (dce)
754 state(hdlc)->last_poll = jiffies;
755
756 error = 0;
757 if (!state(hdlc)->reliable)
758 error = 1;
759
760 if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */
761 state(hdlc)->n391cnt = 0;
762 error = 1;
763 }
764
765 if (dce) {
766 if (state(hdlc)->fullrep_sent && !error) {
767 /* Stop sending full report - the last one has been confirmed by DTE */
768 state(hdlc)->fullrep_sent = 0;
769 pvc = state(hdlc)->first_pvc;
770 while (pvc) {
771 if (pvc->state.new) {
772 pvc->state.new = 0;
773
774 /* Tell DTE that new PVC is now active */
775 state(hdlc)->dce_changed = 1;
776 }
777 pvc = pvc->next;
778 }
779 }
780
781 if (state(hdlc)->dce_changed) {
782 reptype = LMI_FULLREP;
783 state(hdlc)->fullrep_sent = 1;
784 state(hdlc)->dce_changed = 0;
785 }
786
787 state(hdlc)->request = 1; /* got request */
788 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
789 return 0;
790 }
791
792 /* DTE */
793
794 state(hdlc)->request = 0; /* got response, no request pending */
795
796 if (error)
797 return 0;
798
799 if (reptype != LMI_FULLREP)
800 return 0;
801
802 pvc = state(hdlc)->first_pvc;
803
804 while (pvc) {
805 pvc->state.deleted = 1;
806 pvc = pvc->next;
807 }
808
809 no_ram = 0;
810 while (skb->len >= i + 2 + stat_len) {
811 u16 dlci;
812 u32 bw;
813 unsigned int active, new;
814
815 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
816 LMI_ANSI_CISCO_PVCSTAT)) {
817 printk(KERN_INFO "%s: Not an LMI PVC status IE"
818 " (0x%02X)\n", dev->name, skb->data[i]);
819 return 1;
820 }
821
822 if (skb->data[++i] != stat_len) {
823 printk(KERN_INFO "%s: Invalid LMI PVC status IE length"
824 " (%u)\n", dev->name, skb->data[i]);
825 return 1;
826 }
827 i++;
828
829 new = !! (skb->data[i + 2] & 0x08);
830 active = !! (skb->data[i + 2] & 0x02);
831 if (lmi == LMI_CISCO) {
832 dlci = (skb->data[i] << 8) | skb->data[i + 1];
833 bw = (skb->data[i + 3] << 16) |
834 (skb->data[i + 4] << 8) |
835 (skb->data[i + 5]);
836 } else {
837 dlci = ((skb->data[i] & 0x3F) << 4) |
838 ((skb->data[i + 1] & 0x78) >> 3);
839 bw = 0;
840 }
841
842 pvc = add_pvc(dev, dlci);
843
844 if (!pvc && !no_ram) {
845 printk(KERN_WARNING
846 "%s: Memory squeeze on fr_lmi_recv()\n",
847 dev->name);
848 no_ram = 1;
849 }
850
851 if (pvc) {
852 pvc->state.exist = 1;
853 pvc->state.deleted = 0;
854 if (active != pvc->state.active ||
855 new != pvc->state.new ||
856 bw != pvc->state.bandwidth ||
857 !pvc->state.exist) {
858 pvc->state.new = new;
859 pvc->state.active = active;
860 pvc->state.bandwidth = bw;
861 pvc_carrier(active, pvc);
862 fr_log_dlci_active(pvc);
863 }
864 }
865
866 i += stat_len;
867 }
868
869 pvc = state(hdlc)->first_pvc;
870
871 while (pvc) {
872 if (pvc->state.deleted && pvc->state.exist) {
873 pvc_carrier(0, pvc);
874 pvc->state.active = pvc->state.new = 0;
875 pvc->state.exist = 0;
876 pvc->state.bandwidth = 0;
877 fr_log_dlci_active(pvc);
878 }
879 pvc = pvc->next;
880 }
881
882 /* Next full report after N391 polls */
883 state(hdlc)->n391cnt = state(hdlc)->settings.n391;
884
885 return 0;
886 }
887
888
889 static int fr_rx(struct sk_buff *skb)
890 {
891 struct net_device *frad = skb->dev;
892 hdlc_device *hdlc = dev_to_hdlc(frad);
893 fr_hdr *fh = (fr_hdr*)skb->data;
894 u8 *data = skb->data;
895 u16 dlci;
896 pvc_device *pvc;
897 struct net_device *dev = NULL;
898
899 if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
900 goto rx_error;
901
902 dlci = q922_to_dlci(skb->data);
903
904 if ((dlci == LMI_CCITT_ANSI_DLCI &&
905 (state(hdlc)->settings.lmi == LMI_ANSI ||
906 state(hdlc)->settings.lmi == LMI_CCITT)) ||
907 (dlci == LMI_CISCO_DLCI &&
908 state(hdlc)->settings.lmi == LMI_CISCO)) {
909 if (fr_lmi_recv(frad, skb))
910 goto rx_error;
911 dev_kfree_skb_any(skb);
912 return NET_RX_SUCCESS;
913 }
914
915 pvc = find_pvc(hdlc, dlci);
916 if (!pvc) {
917 #ifdef DEBUG_PKT
918 printk(KERN_INFO "%s: No PVC for received frame's DLCI %d\n",
919 frad->name, dlci);
920 #endif
921 dev_kfree_skb_any(skb);
922 return NET_RX_DROP;
923 }
924
925 if (pvc->state.fecn != fh->fecn) {
926 #ifdef DEBUG_ECN
927 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name,
928 dlci, fh->fecn ? "N" : "FF");
929 #endif
930 pvc->state.fecn ^= 1;
931 }
932
933 if (pvc->state.becn != fh->becn) {
934 #ifdef DEBUG_ECN
935 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name,
936 dlci, fh->becn ? "N" : "FF");
937 #endif
938 pvc->state.becn ^= 1;
939 }
940
941
942 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
943 frad->stats.rx_dropped++;
944 return NET_RX_DROP;
945 }
946
947 if (data[3] == NLPID_IP) {
948 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
949 dev = pvc->main;
950 skb->protocol = htons(ETH_P_IP);
951
952 } else if (data[3] == NLPID_IPV6) {
953 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
954 dev = pvc->main;
955 skb->protocol = htons(ETH_P_IPV6);
956
957 } else if (skb->len > 10 && data[3] == FR_PAD &&
958 data[4] == NLPID_SNAP && data[5] == FR_PAD) {
959 u16 oui = ntohs(*(__be16*)(data + 6));
960 u16 pid = ntohs(*(__be16*)(data + 8));
961 skb_pull(skb, 10);
962
963 switch ((((u32)oui) << 16) | pid) {
964 case ETH_P_ARP: /* routed frame with SNAP */
965 case ETH_P_IPX:
966 case ETH_P_IP: /* a long variant */
967 case ETH_P_IPV6:
968 dev = pvc->main;
969 skb->protocol = htons(pid);
970 break;
971
972 case 0x80C20007: /* bridged Ethernet frame */
973 if ((dev = pvc->ether) != NULL)
974 skb->protocol = eth_type_trans(skb, dev);
975 break;
976
977 default:
978 printk(KERN_INFO "%s: Unsupported protocol, OUI=%x "
979 "PID=%x\n", frad->name, oui, pid);
980 dev_kfree_skb_any(skb);
981 return NET_RX_DROP;
982 }
983 } else {
984 printk(KERN_INFO "%s: Unsupported protocol, NLPID=%x "
985 "length = %i\n", frad->name, data[3], skb->len);
986 dev_kfree_skb_any(skb);
987 return NET_RX_DROP;
988 }
989
990 if (dev) {
991 dev->stats.rx_packets++; /* PVC traffic */
992 dev->stats.rx_bytes += skb->len;
993 if (pvc->state.becn)
994 dev->stats.rx_compressed++;
995 netif_rx(skb);
996 return NET_RX_SUCCESS;
997 } else {
998 dev_kfree_skb_any(skb);
999 return NET_RX_DROP;
1000 }
1001
1002 rx_error:
1003 frad->stats.rx_errors++; /* Mark error */
1004 dev_kfree_skb_any(skb);
1005 return NET_RX_DROP;
1006 }
1007
1008
1009
1010 static void fr_start(struct net_device *dev)
1011 {
1012 hdlc_device *hdlc = dev_to_hdlc(dev);
1013 #ifdef DEBUG_LINK
1014 printk(KERN_DEBUG "fr_start\n");
1015 #endif
1016 if (state(hdlc)->settings.lmi != LMI_NONE) {
1017 state(hdlc)->reliable = 0;
1018 state(hdlc)->dce_changed = 1;
1019 state(hdlc)->request = 0;
1020 state(hdlc)->fullrep_sent = 0;
1021 state(hdlc)->last_errors = 0xFFFFFFFF;
1022 state(hdlc)->n391cnt = 0;
1023 state(hdlc)->txseq = state(hdlc)->rxseq = 0;
1024
1025 init_timer(&state(hdlc)->timer);
1026 /* First poll after 1 s */
1027 state(hdlc)->timer.expires = jiffies + HZ;
1028 state(hdlc)->timer.function = fr_timer;
1029 state(hdlc)->timer.data = (unsigned long)dev;
1030 add_timer(&state(hdlc)->timer);
1031 } else
1032 fr_set_link_state(1, dev);
1033 }
1034
1035
1036 static void fr_stop(struct net_device *dev)
1037 {
1038 hdlc_device *hdlc = dev_to_hdlc(dev);
1039 #ifdef DEBUG_LINK
1040 printk(KERN_DEBUG "fr_stop\n");
1041 #endif
1042 if (state(hdlc)->settings.lmi != LMI_NONE)
1043 del_timer_sync(&state(hdlc)->timer);
1044 fr_set_link_state(0, dev);
1045 }
1046
1047
1048 static void fr_close(struct net_device *dev)
1049 {
1050 hdlc_device *hdlc = dev_to_hdlc(dev);
1051 pvc_device *pvc = state(hdlc)->first_pvc;
1052
1053 while (pvc) { /* Shutdown all PVCs for this FRAD */
1054 if (pvc->main)
1055 dev_close(pvc->main);
1056 if (pvc->ether)
1057 dev_close(pvc->ether);
1058 pvc = pvc->next;
1059 }
1060 }
1061
1062
1063 static void pvc_setup(struct net_device *dev)
1064 {
1065 dev->type = ARPHRD_DLCI;
1066 dev->flags = IFF_POINTOPOINT;
1067 dev->hard_header_len = 10;
1068 dev->addr_len = 2;
1069 }
1070
1071 static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
1072 {
1073 hdlc_device *hdlc = dev_to_hdlc(frad);
1074 pvc_device *pvc;
1075 struct net_device *dev;
1076 int result, used;
1077
1078 if ((pvc = add_pvc(frad, dlci)) == NULL) {
1079 printk(KERN_WARNING "%s: Memory squeeze on fr_add_pvc()\n",
1080 frad->name);
1081 return -ENOBUFS;
1082 }
1083
1084 if (*get_dev_p(pvc, type))
1085 return -EEXIST;
1086
1087 used = pvc_is_used(pvc);
1088
1089 if (type == ARPHRD_ETHER)
1090 dev = alloc_netdev(0, "pvceth%d", ether_setup);
1091 else
1092 dev = alloc_netdev(0, "pvc%d", pvc_setup);
1093
1094 if (!dev) {
1095 printk(KERN_WARNING "%s: Memory squeeze on fr_pvc()\n",
1096 frad->name);
1097 delete_unused_pvcs(hdlc);
1098 return -ENOBUFS;
1099 }
1100
1101 if (type == ARPHRD_ETHER)
1102 random_ether_addr(dev->dev_addr);
1103 else {
1104 *(__be16*)dev->dev_addr = htons(dlci);
1105 dlci_to_q922(dev->broadcast, dlci);
1106 }
1107 dev->hard_start_xmit = pvc_xmit;
1108 dev->open = pvc_open;
1109 dev->stop = pvc_close;
1110 dev->do_ioctl = pvc_ioctl;
1111 dev->change_mtu = pvc_change_mtu;
1112 dev->mtu = HDLC_MAX_MTU;
1113 dev->tx_queue_len = 0;
1114 dev->priv = pvc;
1115
1116 result = dev_alloc_name(dev, dev->name);
1117 if (result < 0) {
1118 free_netdev(dev);
1119 delete_unused_pvcs(hdlc);
1120 return result;
1121 }
1122
1123 if (register_netdevice(dev) != 0) {
1124 free_netdev(dev);
1125 delete_unused_pvcs(hdlc);
1126 return -EIO;
1127 }
1128
1129 dev->destructor = free_netdev;
1130 *get_dev_p(pvc, type) = dev;
1131 if (!used) {
1132 state(hdlc)->dce_changed = 1;
1133 state(hdlc)->dce_pvc_count++;
1134 }
1135 return 0;
1136 }
1137
1138
1139
1140 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
1141 {
1142 pvc_device *pvc;
1143 struct net_device *dev;
1144
1145 if ((pvc = find_pvc(hdlc, dlci)) == NULL)
1146 return -ENOENT;
1147
1148 if ((dev = *get_dev_p(pvc, type)) == NULL)
1149 return -ENOENT;
1150
1151 if (dev->flags & IFF_UP)
1152 return -EBUSY; /* PVC in use */
1153
1154 unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
1155 *get_dev_p(pvc, type) = NULL;
1156
1157 if (!pvc_is_used(pvc)) {
1158 state(hdlc)->dce_pvc_count--;
1159 state(hdlc)->dce_changed = 1;
1160 }
1161 delete_unused_pvcs(hdlc);
1162 return 0;
1163 }
1164
1165
1166
1167 static void fr_destroy(struct net_device *frad)
1168 {
1169 hdlc_device *hdlc = dev_to_hdlc(frad);
1170 pvc_device *pvc = state(hdlc)->first_pvc;
1171 state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */
1172 state(hdlc)->dce_pvc_count = 0;
1173 state(hdlc)->dce_changed = 1;
1174
1175 while (pvc) {
1176 pvc_device *next = pvc->next;
1177 /* destructors will free_netdev() main and ether */
1178 if (pvc->main)
1179 unregister_netdevice(pvc->main);
1180
1181 if (pvc->ether)
1182 unregister_netdevice(pvc->ether);
1183
1184 kfree(pvc);
1185 pvc = next;
1186 }
1187 }
1188
1189
1190 static struct hdlc_proto proto = {
1191 .close = fr_close,
1192 .start = fr_start,
1193 .stop = fr_stop,
1194 .detach = fr_destroy,
1195 .ioctl = fr_ioctl,
1196 .netif_rx = fr_rx,
1197 .module = THIS_MODULE,
1198 };
1199
1200
1201 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr)
1202 {
1203 fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
1204 const size_t size = sizeof(fr_proto);
1205 fr_proto new_settings;
1206 hdlc_device *hdlc = dev_to_hdlc(dev);
1207 fr_proto_pvc pvc;
1208 int result;
1209
1210 switch (ifr->ifr_settings.type) {
1211 case IF_GET_PROTO:
1212 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1213 return -EINVAL;
1214 ifr->ifr_settings.type = IF_PROTO_FR;
1215 if (ifr->ifr_settings.size < size) {
1216 ifr->ifr_settings.size = size; /* data size wanted */
1217 return -ENOBUFS;
1218 }
1219 if (copy_to_user(fr_s, &state(hdlc)->settings, size))
1220 return -EFAULT;
1221 return 0;
1222
1223 case IF_PROTO_FR:
1224 if(!capable(CAP_NET_ADMIN))
1225 return -EPERM;
1226
1227 if(dev->flags & IFF_UP)
1228 return -EBUSY;
1229
1230 if (copy_from_user(&new_settings, fr_s, size))
1231 return -EFAULT;
1232
1233 if (new_settings.lmi == LMI_DEFAULT)
1234 new_settings.lmi = LMI_ANSI;
1235
1236 if ((new_settings.lmi != LMI_NONE &&
1237 new_settings.lmi != LMI_ANSI &&
1238 new_settings.lmi != LMI_CCITT &&
1239 new_settings.lmi != LMI_CISCO) ||
1240 new_settings.t391 < 1 ||
1241 new_settings.t392 < 2 ||
1242 new_settings.n391 < 1 ||
1243 new_settings.n392 < 1 ||
1244 new_settings.n393 < new_settings.n392 ||
1245 new_settings.n393 > 32 ||
1246 (new_settings.dce != 0 &&
1247 new_settings.dce != 1))
1248 return -EINVAL;
1249
1250 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1251 if (result)
1252 return result;
1253
1254 if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */
1255 result = attach_hdlc_protocol(dev, &proto,
1256 sizeof(struct frad_state));
1257 if (result)
1258 return result;
1259 state(hdlc)->first_pvc = NULL;
1260 state(hdlc)->dce_pvc_count = 0;
1261 }
1262 memcpy(&state(hdlc)->settings, &new_settings, size);
1263
1264 dev->hard_start_xmit = hdlc->xmit;
1265 dev->type = ARPHRD_FRAD;
1266 return 0;
1267
1268 case IF_PROTO_FR_ADD_PVC:
1269 case IF_PROTO_FR_DEL_PVC:
1270 case IF_PROTO_FR_ADD_ETH_PVC:
1271 case IF_PROTO_FR_DEL_ETH_PVC:
1272 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1273 return -EINVAL;
1274
1275 if(!capable(CAP_NET_ADMIN))
1276 return -EPERM;
1277
1278 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
1279 sizeof(fr_proto_pvc)))
1280 return -EFAULT;
1281
1282 if (pvc.dlci <= 0 || pvc.dlci >= 1024)
1283 return -EINVAL; /* Only 10 bits, DLCI 0 reserved */
1284
1285 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
1286 ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
1287 result = ARPHRD_ETHER; /* bridged Ethernet device */
1288 else
1289 result = ARPHRD_DLCI;
1290
1291 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
1292 ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
1293 return fr_add_pvc(dev, pvc.dlci, result);
1294 else
1295 return fr_del_pvc(hdlc, pvc.dlci, result);
1296 }
1297
1298 return -EINVAL;
1299 }
1300
1301
1302 static int __init mod_init(void)
1303 {
1304 register_hdlc_protocol(&proto);
1305 return 0;
1306 }
1307
1308
1309 static void __exit mod_exit(void)
1310 {
1311 unregister_hdlc_protocol(&proto);
1312 }
1313
1314
1315 module_init(mod_init);
1316 module_exit(mod_exit);
1317
1318 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
1319 MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC");
1320 MODULE_LICENSE("GPL v2");
Support for the Chinese Samsung S3C2440 based development boards