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Merge branch 'gadget' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux/fpc-iii.git] / drivers / net / wan / hdlc_fr.c
blob3ebed1c40abb11c192db0acc36d90bfd2028c646
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/errno.h>
37 #include <linux/etherdevice.h>
38 #include <linux/hdlc.h>
39 #include <linux/if_arp.h>
40 #include <linux/inetdevice.h>
41 #include <linux/init.h>
42 #include <linux/kernel.h>
43 #include <linux/module.h>
44 #include <linux/pkt_sched.h>
45 #include <linux/poll.h>
46 #include <linux/rtnetlink.h>
47 #include <linux/skbuff.h>
48 #include <linux/slab.h>
49
50 #undef DEBUG_PKT
51 #undef DEBUG_ECN
52 #undef DEBUG_LINK
53 #undef DEBUG_PROTO
54 #undef DEBUG_PVC
55
56 #define FR_UI 0x03
57 #define FR_PAD 0x00
58
59 #define NLPID_IP 0xCC
60 #define NLPID_IPV6 0x8E
61 #define NLPID_SNAP 0x80
62 #define NLPID_PAD 0x00
63 #define NLPID_CCITT_ANSI_LMI 0x08
64 #define NLPID_CISCO_LMI 0x09
65
66
67 #define LMI_CCITT_ANSI_DLCI 0 /* LMI DLCI */
68 #define LMI_CISCO_DLCI 1023
69
70 #define LMI_CALLREF 0x00 /* Call Reference */
71 #define LMI_ANSI_LOCKSHIFT 0x95 /* ANSI locking shift */
72 #define LMI_ANSI_CISCO_REPTYPE 0x01 /* report type */
73 #define LMI_CCITT_REPTYPE 0x51
74 #define LMI_ANSI_CISCO_ALIVE 0x03 /* keep alive */
75 #define LMI_CCITT_ALIVE 0x53
76 #define LMI_ANSI_CISCO_PVCSTAT 0x07 /* PVC status */
77 #define LMI_CCITT_PVCSTAT 0x57
78
79 #define LMI_FULLREP 0x00 /* full report */
80 #define LMI_INTEGRITY 0x01 /* link integrity report */
81 #define LMI_SINGLE 0x02 /* single PVC report */
82
83 #define LMI_STATUS_ENQUIRY 0x75
84 #define LMI_STATUS 0x7D /* reply */
85
86 #define LMI_REPT_LEN 1 /* report type element length */
87 #define LMI_INTEG_LEN 2 /* link integrity element length */
88
89 #define LMI_CCITT_CISCO_LENGTH 13 /* LMI frame lengths */
90 #define LMI_ANSI_LENGTH 14
91
92
93 struct fr_hdr {
94 #if defined(__LITTLE_ENDIAN_BITFIELD)
95 unsigned ea1: 1;
96 unsigned cr: 1;
97 unsigned dlcih: 6;
98
99 unsigned ea2: 1;
100 unsigned de: 1;
101 unsigned becn: 1;
102 unsigned fecn: 1;
103 unsigned dlcil: 4;
104 #else
105 unsigned dlcih: 6;
106 unsigned cr: 1;
107 unsigned ea1: 1;
108
109 unsigned dlcil: 4;
110 unsigned fecn: 1;
111 unsigned becn: 1;
112 unsigned de: 1;
113 unsigned ea2: 1;
114 #endif
115 } __packed;
116
117
118 struct pvc_device {
119 struct net_device *frad;
120 struct net_device *main;
121 struct net_device *ether; /* bridged Ethernet interface */
122 struct pvc_device *next; /* Sorted in ascending DLCI order */
123 int dlci;
124 int open_count;
125
126 struct {
127 unsigned int new: 1;
128 unsigned int active: 1;
129 unsigned int exist: 1;
130 unsigned int deleted: 1;
131 unsigned int fecn: 1;
132 unsigned int becn: 1;
133 unsigned int bandwidth; /* Cisco LMI reporting only */
134 }state;
135 };
136
137 struct frad_state {
138 fr_proto settings;
139 struct pvc_device *first_pvc;
140 int dce_pvc_count;
141
142 struct timer_list timer;
143 unsigned long last_poll;
144 int reliable;
145 int dce_changed;
146 int request;
147 int fullrep_sent;
148 u32 last_errors; /* last errors bit list */
149 u8 n391cnt;
150 u8 txseq; /* TX sequence number */
151 u8 rxseq; /* RX sequence number */
152 };
153
154
155 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr);
156
157
158 static inline u16 q922_to_dlci(u8 *hdr)
159 {
160 return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
161 }
162
163
164 static inline void dlci_to_q922(u8 *hdr, u16 dlci)
165 {
166 hdr[0] = (dlci >> 2) & 0xFC;
167 hdr[1] = ((dlci << 4) & 0xF0) | 0x01;
168 }
169
170
171 static inline struct frad_state* state(hdlc_device *hdlc)
172 {
173 return(struct frad_state *)(hdlc->state);
174 }
175
176
177 static inline struct pvc_device *find_pvc(hdlc_device *hdlc, u16 dlci)
178 {
179 struct pvc_device *pvc = state(hdlc)->first_pvc;
180
181 while (pvc) {
182 if (pvc->dlci == dlci)
183 return pvc;
184 if (pvc->dlci > dlci)
185 return NULL; /* the list is sorted */
186 pvc = pvc->next;
187 }
188
189 return NULL;
190 }
191
192
193 static struct pvc_device *add_pvc(struct net_device *dev, u16 dlci)
194 {
195 hdlc_device *hdlc = dev_to_hdlc(dev);
196 struct pvc_device *pvc, **pvc_p = &state(hdlc)->first_pvc;
197
198 while (*pvc_p) {
199 if ((*pvc_p)->dlci == dlci)
200 return *pvc_p;
201 if ((*pvc_p)->dlci > dlci)
202 break; /* the list is sorted */
203 pvc_p = &(*pvc_p)->next;
204 }
205
206 pvc = kzalloc(sizeof(*pvc), GFP_ATOMIC);
207 #ifdef DEBUG_PVC
208 printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev);
209 #endif
210 if (!pvc)
211 return NULL;
212
213 pvc->dlci = dlci;
214 pvc->frad = dev;
215 pvc->next = *pvc_p; /* Put it in the chain */
216 *pvc_p = pvc;
217 return pvc;
218 }
219
220
221 static inline int pvc_is_used(struct pvc_device *pvc)
222 {
223 return pvc->main || pvc->ether;
224 }
225
226
227 static inline void pvc_carrier(int on, struct pvc_device *pvc)
228 {
229 if (on) {
230 if (pvc->main)
231 if (!netif_carrier_ok(pvc->main))
232 netif_carrier_on(pvc->main);
233 if (pvc->ether)
234 if (!netif_carrier_ok(pvc->ether))
235 netif_carrier_on(pvc->ether);
236 } else {
237 if (pvc->main)
238 if (netif_carrier_ok(pvc->main))
239 netif_carrier_off(pvc->main);
240 if (pvc->ether)
241 if (netif_carrier_ok(pvc->ether))
242 netif_carrier_off(pvc->ether);
243 }
244 }
245
246
247 static inline void delete_unused_pvcs(hdlc_device *hdlc)
248 {
249 struct pvc_device **pvc_p = &state(hdlc)->first_pvc;
250
251 while (*pvc_p) {
252 if (!pvc_is_used(*pvc_p)) {
253 struct pvc_device *pvc = *pvc_p;
254 #ifdef DEBUG_PVC
255 printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc);
256 #endif
257 *pvc_p = pvc->next;
258 kfree(pvc);
259 continue;
260 }
261 pvc_p = &(*pvc_p)->next;
262 }
263 }
264
265
266 static inline struct net_device **get_dev_p(struct pvc_device *pvc,
267 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 cpu_to_be16(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 cpu_to_be16(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 cpu_to_be16(ETH_P_IP):
295 head_len = 4;
296 skb_push(skb, head_len);
297 skb->data[3] = NLPID_IP;
298 break;
299
300 case cpu_to_be16(ETH_P_IPV6):
301 head_len = 4;
302 skb_push(skb, head_len);
303 skb->data[3] = NLPID_IPV6;
304 break;
305
306 case cpu_to_be16(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 struct pvc_device *pvc = dev->ml_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 struct pvc_device *pvc = dev->ml_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 struct pvc_device *pvc = dev->ml_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 netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev)
412 {
413 struct pvc_device *pvc = dev->ml_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 NETDEV_TX_OK;
426 }
427 skb_put(skb, pad);
428 memset(skb->data + len, 0, pad);
429 }
430 skb->protocol = cpu_to_be16(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 NETDEV_TX_OK;
440 }
441 }
442
443 dev->stats.tx_dropped++;
444 dev_kfree_skb(skb);
445 return NETDEV_TX_OK;
446 }
447
448 static inline void fr_log_dlci_active(struct pvc_device *pvc)
449 {
450 netdev_info(pvc->frad, "DLCI %d [%s%s%s]%s %s\n",
451 pvc->dlci,
452 pvc->main ? pvc->main->name : "",
453 pvc->main && pvc->ether ? " " : "",
454 pvc->ether ? pvc->ether->name : "",
455 pvc->state.new ? " new" : "",
456 !pvc->state.exist ? "deleted" :
457 pvc->state.active ? "active" : "inactive");
458 }
459
460
461
462 static inline u8 fr_lmi_nextseq(u8 x)
463 {
464 x++;
465 return x ? x : 1;
466 }
467
468
469 static void fr_lmi_send(struct net_device *dev, int fullrep)
470 {
471 hdlc_device *hdlc = dev_to_hdlc(dev);
472 struct sk_buff *skb;
473 struct pvc_device *pvc = state(hdlc)->first_pvc;
474 int lmi = state(hdlc)->settings.lmi;
475 int dce = state(hdlc)->settings.dce;
476 int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
477 int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
478 u8 *data;
479 int i = 0;
480
481 if (dce && fullrep) {
482 len += state(hdlc)->dce_pvc_count * (2 + stat_len);
483 if (len > HDLC_MAX_MRU) {
484 netdev_warn(dev, "Too many PVCs while sending LMI full report\n");
485 return;
486 }
487 }
488
489 skb = dev_alloc_skb(len);
490 if (!skb) {
491 netdev_warn(dev, "Memory squeeze on fr_lmi_send()\n");
492 return;
493 }
494 memset(skb->data, 0, len);
495 skb_reserve(skb, 4);
496 if (lmi == LMI_CISCO) {
497 skb->protocol = cpu_to_be16(NLPID_CISCO_LMI);
498 fr_hard_header(&skb, LMI_CISCO_DLCI);
499 } else {
500 skb->protocol = cpu_to_be16(NLPID_CCITT_ANSI_LMI);
501 fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI);
502 }
503 data = skb_tail_pointer(skb);
504 data[i++] = LMI_CALLREF;
505 data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
506 if (lmi == LMI_ANSI)
507 data[i++] = LMI_ANSI_LOCKSHIFT;
508 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
509 LMI_ANSI_CISCO_REPTYPE;
510 data[i++] = LMI_REPT_LEN;
511 data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
512 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
513 data[i++] = LMI_INTEG_LEN;
514 data[i++] = state(hdlc)->txseq =
515 fr_lmi_nextseq(state(hdlc)->txseq);
516 data[i++] = state(hdlc)->rxseq;
517
518 if (dce && fullrep) {
519 while (pvc) {
520 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
521 LMI_ANSI_CISCO_PVCSTAT;
522 data[i++] = stat_len;
523
524 /* LMI start/restart */
525 if (state(hdlc)->reliable && !pvc->state.exist) {
526 pvc->state.exist = pvc->state.new = 1;
527 fr_log_dlci_active(pvc);
528 }
529
530 /* ifconfig PVC up */
531 if (pvc->open_count && !pvc->state.active &&
532 pvc->state.exist && !pvc->state.new) {
533 pvc_carrier(1, pvc);
534 pvc->state.active = 1;
535 fr_log_dlci_active(pvc);
536 }
537
538 if (lmi == LMI_CISCO) {
539 data[i] = pvc->dlci >> 8;
540 data[i + 1] = pvc->dlci & 0xFF;
541 } else {
542 data[i] = (pvc->dlci >> 4) & 0x3F;
543 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
544 data[i + 2] = 0x80;
545 }
546
547 if (pvc->state.new)
548 data[i + 2] |= 0x08;
549 else if (pvc->state.active)
550 data[i + 2] |= 0x02;
551
552 i += stat_len;
553 pvc = pvc->next;
554 }
555 }
556
557 skb_put(skb, i);
558 skb->priority = TC_PRIO_CONTROL;
559 skb->dev = dev;
560 skb_reset_network_header(skb);
561
562 dev_queue_xmit(skb);
563 }
564
565
566
567 static void fr_set_link_state(int reliable, struct net_device *dev)
568 {
569 hdlc_device *hdlc = dev_to_hdlc(dev);
570 struct pvc_device *pvc = state(hdlc)->first_pvc;
571
572 state(hdlc)->reliable = reliable;
573 if (reliable) {
574 netif_dormant_off(dev);
575 state(hdlc)->n391cnt = 0; /* Request full status */
576 state(hdlc)->dce_changed = 1;
577
578 if (state(hdlc)->settings.lmi == LMI_NONE) {
579 while (pvc) { /* Activate all PVCs */
580 pvc_carrier(1, pvc);
581 pvc->state.exist = pvc->state.active = 1;
582 pvc->state.new = 0;
583 pvc = pvc->next;
584 }
585 }
586 } else {
587 netif_dormant_on(dev);
588 while (pvc) { /* Deactivate all PVCs */
589 pvc_carrier(0, pvc);
590 pvc->state.exist = pvc->state.active = 0;
591 pvc->state.new = 0;
592 if (!state(hdlc)->settings.dce)
593 pvc->state.bandwidth = 0;
594 pvc = pvc->next;
595 }
596 }
597 }
598
599
600 static void fr_timer(unsigned long arg)
601 {
602 struct net_device *dev = (struct net_device *)arg;
603 hdlc_device *hdlc = dev_to_hdlc(dev);
604 int i, cnt = 0, reliable;
605 u32 list;
606
607 if (state(hdlc)->settings.dce) {
608 reliable = state(hdlc)->request &&
609 time_before(jiffies, state(hdlc)->last_poll +
610 state(hdlc)->settings.t392 * HZ);
611 state(hdlc)->request = 0;
612 } else {
613 state(hdlc)->last_errors <<= 1; /* Shift the list */
614 if (state(hdlc)->request) {
615 if (state(hdlc)->reliable)
616 netdev_info(dev, "No LMI status reply received\n");
617 state(hdlc)->last_errors |= 1;
618 }
619
620 list = state(hdlc)->last_errors;
621 for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1)
622 cnt += (list & 1); /* errors count */
623
624 reliable = (cnt < state(hdlc)->settings.n392);
625 }
626
627 if (state(hdlc)->reliable != reliable) {
628 netdev_info(dev, "Link %sreliable\n", reliable ? "" : "un");
629 fr_set_link_state(reliable, dev);
630 }
631
632 if (state(hdlc)->settings.dce)
633 state(hdlc)->timer.expires = jiffies +
634 state(hdlc)->settings.t392 * HZ;
635 else {
636 if (state(hdlc)->n391cnt)
637 state(hdlc)->n391cnt--;
638
639 fr_lmi_send(dev, state(hdlc)->n391cnt == 0);
640
641 state(hdlc)->last_poll = jiffies;
642 state(hdlc)->request = 1;
643 state(hdlc)->timer.expires = jiffies +
644 state(hdlc)->settings.t391 * HZ;
645 }
646
647 state(hdlc)->timer.function = fr_timer;
648 state(hdlc)->timer.data = arg;
649 add_timer(&state(hdlc)->timer);
650 }
651
652
653 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
654 {
655 hdlc_device *hdlc = dev_to_hdlc(dev);
656 struct pvc_device *pvc;
657 u8 rxseq, txseq;
658 int lmi = state(hdlc)->settings.lmi;
659 int dce = state(hdlc)->settings.dce;
660 int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;
661
662 if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
663 LMI_CCITT_CISCO_LENGTH)) {
664 netdev_info(dev, "Short LMI frame\n");
665 return 1;
666 }
667
668 if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
669 NLPID_CCITT_ANSI_LMI)) {
670 netdev_info(dev, "Received non-LMI frame with LMI DLCI\n");
671 return 1;
672 }
673
674 if (skb->data[4] != LMI_CALLREF) {
675 netdev_info(dev, "Invalid LMI Call reference (0x%02X)\n",
676 skb->data[4]);
677 return 1;
678 }
679
680 if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
681 netdev_info(dev, "Invalid LMI Message type (0x%02X)\n",
682 skb->data[5]);
683 return 1;
684 }
685
686 if (lmi == LMI_ANSI) {
687 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
688 netdev_info(dev, "Not ANSI locking shift in LMI message (0x%02X)\n",
689 skb->data[6]);
690 return 1;
691 }
692 i = 7;
693 } else
694 i = 6;
695
696 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
697 LMI_ANSI_CISCO_REPTYPE)) {
698 netdev_info(dev, "Not an LMI Report type IE (0x%02X)\n",
699 skb->data[i]);
700 return 1;
701 }
702
703 if (skb->data[++i] != LMI_REPT_LEN) {
704 netdev_info(dev, "Invalid LMI Report type IE length (%u)\n",
705 skb->data[i]);
706 return 1;
707 }
708
709 reptype = skb->data[++i];
710 if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
711 netdev_info(dev, "Unsupported LMI Report type (0x%02X)\n",
712 reptype);
713 return 1;
714 }
715
716 if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
717 LMI_ANSI_CISCO_ALIVE)) {
718 netdev_info(dev, "Not an LMI Link integrity verification IE (0x%02X)\n",
719 skb->data[i]);
720 return 1;
721 }
722
723 if (skb->data[++i] != LMI_INTEG_LEN) {
724 netdev_info(dev, "Invalid LMI Link integrity verification IE length (%u)\n",
725 skb->data[i]);
726 return 1;
727 }
728 i++;
729
730 state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */
731 rxseq = skb->data[i++]; /* Should confirm our sequence */
732
733 txseq = state(hdlc)->txseq;
734
735 if (dce)
736 state(hdlc)->last_poll = jiffies;
737
738 error = 0;
739 if (!state(hdlc)->reliable)
740 error = 1;
741
742 if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */
743 state(hdlc)->n391cnt = 0;
744 error = 1;
745 }
746
747 if (dce) {
748 if (state(hdlc)->fullrep_sent && !error) {
749 /* Stop sending full report - the last one has been confirmed by DTE */
750 state(hdlc)->fullrep_sent = 0;
751 pvc = state(hdlc)->first_pvc;
752 while (pvc) {
753 if (pvc->state.new) {
754 pvc->state.new = 0;
755
756 /* Tell DTE that new PVC is now active */
757 state(hdlc)->dce_changed = 1;
758 }
759 pvc = pvc->next;
760 }
761 }
762
763 if (state(hdlc)->dce_changed) {
764 reptype = LMI_FULLREP;
765 state(hdlc)->fullrep_sent = 1;
766 state(hdlc)->dce_changed = 0;
767 }
768
769 state(hdlc)->request = 1; /* got request */
770 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
771 return 0;
772 }
773
774 /* DTE */
775
776 state(hdlc)->request = 0; /* got response, no request pending */
777
778 if (error)
779 return 0;
780
781 if (reptype != LMI_FULLREP)
782 return 0;
783
784 pvc = state(hdlc)->first_pvc;
785
786 while (pvc) {
787 pvc->state.deleted = 1;
788 pvc = pvc->next;
789 }
790
791 no_ram = 0;
792 while (skb->len >= i + 2 + stat_len) {
793 u16 dlci;
794 u32 bw;
795 unsigned int active, new;
796
797 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
798 LMI_ANSI_CISCO_PVCSTAT)) {
799 netdev_info(dev, "Not an LMI PVC status IE (0x%02X)\n",
800 skb->data[i]);
801 return 1;
802 }
803
804 if (skb->data[++i] != stat_len) {
805 netdev_info(dev, "Invalid LMI PVC status IE length (%u)\n",
806 skb->data[i]);
807 return 1;
808 }
809 i++;
810
811 new = !! (skb->data[i + 2] & 0x08);
812 active = !! (skb->data[i + 2] & 0x02);
813 if (lmi == LMI_CISCO) {
814 dlci = (skb->data[i] << 8) | skb->data[i + 1];
815 bw = (skb->data[i + 3] << 16) |
816 (skb->data[i + 4] << 8) |
817 (skb->data[i + 5]);
818 } else {
819 dlci = ((skb->data[i] & 0x3F) << 4) |
820 ((skb->data[i + 1] & 0x78) >> 3);
821 bw = 0;
822 }
823
824 pvc = add_pvc(dev, dlci);
825
826 if (!pvc && !no_ram) {
827 netdev_warn(dev, "Memory squeeze on fr_lmi_recv()\n");
828 no_ram = 1;
829 }
830
831 if (pvc) {
832 pvc->state.exist = 1;
833 pvc->state.deleted = 0;
834 if (active != pvc->state.active ||
835 new != pvc->state.new ||
836 bw != pvc->state.bandwidth ||
837 !pvc->state.exist) {
838 pvc->state.new = new;
839 pvc->state.active = active;
840 pvc->state.bandwidth = bw;
841 pvc_carrier(active, pvc);
842 fr_log_dlci_active(pvc);
843 }
844 }
845
846 i += stat_len;
847 }
848
849 pvc = state(hdlc)->first_pvc;
850
851 while (pvc) {
852 if (pvc->state.deleted && pvc->state.exist) {
853 pvc_carrier(0, pvc);
854 pvc->state.active = pvc->state.new = 0;
855 pvc->state.exist = 0;
856 pvc->state.bandwidth = 0;
857 fr_log_dlci_active(pvc);
858 }
859 pvc = pvc->next;
860 }
861
862 /* Next full report after N391 polls */
863 state(hdlc)->n391cnt = state(hdlc)->settings.n391;
864
865 return 0;
866 }
867
868
869 static int fr_rx(struct sk_buff *skb)
870 {
871 struct net_device *frad = skb->dev;
872 hdlc_device *hdlc = dev_to_hdlc(frad);
873 struct fr_hdr *fh = (struct fr_hdr *)skb->data;
874 u8 *data = skb->data;
875 u16 dlci;
876 struct pvc_device *pvc;
877 struct net_device *dev = NULL;
878
879 if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
880 goto rx_error;
881
882 dlci = q922_to_dlci(skb->data);
883
884 if ((dlci == LMI_CCITT_ANSI_DLCI &&
885 (state(hdlc)->settings.lmi == LMI_ANSI ||
886 state(hdlc)->settings.lmi == LMI_CCITT)) ||
887 (dlci == LMI_CISCO_DLCI &&
888 state(hdlc)->settings.lmi == LMI_CISCO)) {
889 if (fr_lmi_recv(frad, skb))
890 goto rx_error;
891 dev_kfree_skb_any(skb);
892 return NET_RX_SUCCESS;
893 }
894
895 pvc = find_pvc(hdlc, dlci);
896 if (!pvc) {
897 #ifdef DEBUG_PKT
898 netdev_info(frad, "No PVC for received frame's DLCI %d\n",
899 dlci);
900 #endif
901 dev_kfree_skb_any(skb);
902 return NET_RX_DROP;
903 }
904
905 if (pvc->state.fecn != fh->fecn) {
906 #ifdef DEBUG_ECN
907 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name,
908 dlci, fh->fecn ? "N" : "FF");
909 #endif
910 pvc->state.fecn ^= 1;
911 }
912
913 if (pvc->state.becn != fh->becn) {
914 #ifdef DEBUG_ECN
915 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name,
916 dlci, fh->becn ? "N" : "FF");
917 #endif
918 pvc->state.becn ^= 1;
919 }
920
921
922 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
923 frad->stats.rx_dropped++;
924 return NET_RX_DROP;
925 }
926
927 if (data[3] == NLPID_IP) {
928 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
929 dev = pvc->main;
930 skb->protocol = htons(ETH_P_IP);
931
932 } else if (data[3] == NLPID_IPV6) {
933 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
934 dev = pvc->main;
935 skb->protocol = htons(ETH_P_IPV6);
936
937 } else if (skb->len > 10 && data[3] == FR_PAD &&
938 data[4] == NLPID_SNAP && data[5] == FR_PAD) {
939 u16 oui = ntohs(*(__be16*)(data + 6));
940 u16 pid = ntohs(*(__be16*)(data + 8));
941 skb_pull(skb, 10);
942
943 switch ((((u32)oui) << 16) | pid) {
944 case ETH_P_ARP: /* routed frame with SNAP */
945 case ETH_P_IPX:
946 case ETH_P_IP: /* a long variant */
947 case ETH_P_IPV6:
948 dev = pvc->main;
949 skb->protocol = htons(pid);
950 break;
951
952 case 0x80C20007: /* bridged Ethernet frame */
953 if ((dev = pvc->ether) != NULL)
954 skb->protocol = eth_type_trans(skb, dev);
955 break;
956
957 default:
958 netdev_info(frad, "Unsupported protocol, OUI=%x PID=%x\n",
959 oui, pid);
960 dev_kfree_skb_any(skb);
961 return NET_RX_DROP;
962 }
963 } else {
964 netdev_info(frad, "Unsupported protocol, NLPID=%x length=%i\n",
965 data[3], skb->len);
966 dev_kfree_skb_any(skb);
967 return NET_RX_DROP;
968 }
969
970 if (dev) {
971 dev->stats.rx_packets++; /* PVC traffic */
972 dev->stats.rx_bytes += skb->len;
973 if (pvc->state.becn)
974 dev->stats.rx_compressed++;
975 skb->dev = dev;
976 netif_rx(skb);
977 return NET_RX_SUCCESS;
978 } else {
979 dev_kfree_skb_any(skb);
980 return NET_RX_DROP;
981 }
982
983 rx_error:
984 frad->stats.rx_errors++; /* Mark error */
985 dev_kfree_skb_any(skb);
986 return NET_RX_DROP;
987 }
988
989
990
991 static void fr_start(struct net_device *dev)
992 {
993 hdlc_device *hdlc = dev_to_hdlc(dev);
994 #ifdef DEBUG_LINK
995 printk(KERN_DEBUG "fr_start\n");
996 #endif
997 if (state(hdlc)->settings.lmi != LMI_NONE) {
998 state(hdlc)->reliable = 0;
999 state(hdlc)->dce_changed = 1;
1000 state(hdlc)->request = 0;
1001 state(hdlc)->fullrep_sent = 0;
1002 state(hdlc)->last_errors = 0xFFFFFFFF;
1003 state(hdlc)->n391cnt = 0;
1004 state(hdlc)->txseq = state(hdlc)->rxseq = 0;
1005
1006 init_timer(&state(hdlc)->timer);
1007 /* First poll after 1 s */
1008 state(hdlc)->timer.expires = jiffies + HZ;
1009 state(hdlc)->timer.function = fr_timer;
1010 state(hdlc)->timer.data = (unsigned long)dev;
1011 add_timer(&state(hdlc)->timer);
1012 } else
1013 fr_set_link_state(1, dev);
1014 }
1015
1016
1017 static void fr_stop(struct net_device *dev)
1018 {
1019 hdlc_device *hdlc = dev_to_hdlc(dev);
1020 #ifdef DEBUG_LINK
1021 printk(KERN_DEBUG "fr_stop\n");
1022 #endif
1023 if (state(hdlc)->settings.lmi != LMI_NONE)
1024 del_timer_sync(&state(hdlc)->timer);
1025 fr_set_link_state(0, dev);
1026 }
1027
1028
1029 static void fr_close(struct net_device *dev)
1030 {
1031 hdlc_device *hdlc = dev_to_hdlc(dev);
1032 struct pvc_device *pvc = state(hdlc)->first_pvc;
1033
1034 while (pvc) { /* Shutdown all PVCs for this FRAD */
1035 if (pvc->main)
1036 dev_close(pvc->main);
1037 if (pvc->ether)
1038 dev_close(pvc->ether);
1039 pvc = pvc->next;
1040 }
1041 }
1042
1043
1044 static void pvc_setup(struct net_device *dev)
1045 {
1046 dev->type = ARPHRD_DLCI;
1047 dev->flags = IFF_POINTOPOINT;
1048 dev->hard_header_len = 10;
1049 dev->addr_len = 2;
1050 netif_keep_dst(dev);
1051 }
1052
1053 static const struct net_device_ops pvc_ops = {
1054 .ndo_open = pvc_open,
1055 .ndo_stop = pvc_close,
1056 .ndo_change_mtu = hdlc_change_mtu,
1057 .ndo_start_xmit = pvc_xmit,
1058 .ndo_do_ioctl = pvc_ioctl,
1059 };
1060
1061 static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
1062 {
1063 hdlc_device *hdlc = dev_to_hdlc(frad);
1064 struct pvc_device *pvc;
1065 struct net_device *dev;
1066 int used;
1067
1068 if ((pvc = add_pvc(frad, dlci)) == NULL) {
1069 netdev_warn(frad, "Memory squeeze on fr_add_pvc()\n");
1070 return -ENOBUFS;
1071 }
1072
1073 if (*get_dev_p(pvc, type))
1074 return -EEXIST;
1075
1076 used = pvc_is_used(pvc);
1077
1078 if (type == ARPHRD_ETHER) {
1079 dev = alloc_netdev(0, "pvceth%d", NET_NAME_UNKNOWN,
1080 ether_setup);
1081 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1082 } else
1083 dev = alloc_netdev(0, "pvc%d", NET_NAME_UNKNOWN, pvc_setup);
1084
1085 if (!dev) {
1086 netdev_warn(frad, "Memory squeeze on fr_pvc()\n");
1087 delete_unused_pvcs(hdlc);
1088 return -ENOBUFS;
1089 }
1090
1091 if (type == ARPHRD_ETHER)
1092 eth_hw_addr_random(dev);
1093 else {
1094 *(__be16*)dev->dev_addr = htons(dlci);
1095 dlci_to_q922(dev->broadcast, dlci);
1096 }
1097 dev->netdev_ops = &pvc_ops;
1098 dev->mtu = HDLC_MAX_MTU;
1099 dev->tx_queue_len = 0;
1100 dev->ml_priv = pvc;
1101
1102 if (register_netdevice(dev) != 0) {
1103 free_netdev(dev);
1104 delete_unused_pvcs(hdlc);
1105 return -EIO;
1106 }
1107
1108 dev->destructor = free_netdev;
1109 *get_dev_p(pvc, type) = dev;
1110 if (!used) {
1111 state(hdlc)->dce_changed = 1;
1112 state(hdlc)->dce_pvc_count++;
1113 }
1114 return 0;
1115 }
1116
1117
1118
1119 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
1120 {
1121 struct pvc_device *pvc;
1122 struct net_device *dev;
1123
1124 if ((pvc = find_pvc(hdlc, dlci)) == NULL)
1125 return -ENOENT;
1126
1127 if ((dev = *get_dev_p(pvc, type)) == NULL)
1128 return -ENOENT;
1129
1130 if (dev->flags & IFF_UP)
1131 return -EBUSY; /* PVC in use */
1132
1133 unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
1134 *get_dev_p(pvc, type) = NULL;
1135
1136 if (!pvc_is_used(pvc)) {
1137 state(hdlc)->dce_pvc_count--;
1138 state(hdlc)->dce_changed = 1;
1139 }
1140 delete_unused_pvcs(hdlc);
1141 return 0;
1142 }
1143
1144
1145
1146 static void fr_destroy(struct net_device *frad)
1147 {
1148 hdlc_device *hdlc = dev_to_hdlc(frad);
1149 struct pvc_device *pvc = state(hdlc)->first_pvc;
1150 state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */
1151 state(hdlc)->dce_pvc_count = 0;
1152 state(hdlc)->dce_changed = 1;
1153
1154 while (pvc) {
1155 struct pvc_device *next = pvc->next;
1156 /* destructors will free_netdev() main and ether */
1157 if (pvc->main)
1158 unregister_netdevice(pvc->main);
1159
1160 if (pvc->ether)
1161 unregister_netdevice(pvc->ether);
1162
1163 kfree(pvc);
1164 pvc = next;
1165 }
1166 }
1167
1168
1169 static struct hdlc_proto proto = {
1170 .close = fr_close,
1171 .start = fr_start,
1172 .stop = fr_stop,
1173 .detach = fr_destroy,
1174 .ioctl = fr_ioctl,
1175 .netif_rx = fr_rx,
1176 .module = THIS_MODULE,
1177 };
1178
1179
1180 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr)
1181 {
1182 fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
1183 const size_t size = sizeof(fr_proto);
1184 fr_proto new_settings;
1185 hdlc_device *hdlc = dev_to_hdlc(dev);
1186 fr_proto_pvc pvc;
1187 int result;
1188
1189 switch (ifr->ifr_settings.type) {
1190 case IF_GET_PROTO:
1191 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1192 return -EINVAL;
1193 ifr->ifr_settings.type = IF_PROTO_FR;
1194 if (ifr->ifr_settings.size < size) {
1195 ifr->ifr_settings.size = size; /* data size wanted */
1196 return -ENOBUFS;
1197 }
1198 if (copy_to_user(fr_s, &state(hdlc)->settings, size))
1199 return -EFAULT;
1200 return 0;
1201
1202 case IF_PROTO_FR:
1203 if (!capable(CAP_NET_ADMIN))
1204 return -EPERM;
1205
1206 if (dev->flags & IFF_UP)
1207 return -EBUSY;
1208
1209 if (copy_from_user(&new_settings, fr_s, size))
1210 return -EFAULT;
1211
1212 if (new_settings.lmi == LMI_DEFAULT)
1213 new_settings.lmi = LMI_ANSI;
1214
1215 if ((new_settings.lmi != LMI_NONE &&
1216 new_settings.lmi != LMI_ANSI &&
1217 new_settings.lmi != LMI_CCITT &&
1218 new_settings.lmi != LMI_CISCO) ||
1219 new_settings.t391 < 1 ||
1220 new_settings.t392 < 2 ||
1221 new_settings.n391 < 1 ||
1222 new_settings.n392 < 1 ||
1223 new_settings.n393 < new_settings.n392 ||
1224 new_settings.n393 > 32 ||
1225 (new_settings.dce != 0 &&
1226 new_settings.dce != 1))
1227 return -EINVAL;
1228
1229 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1230 if (result)
1231 return result;
1232
1233 if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */
1234 result = attach_hdlc_protocol(dev, &proto,
1235 sizeof(struct frad_state));
1236 if (result)
1237 return result;
1238 state(hdlc)->first_pvc = NULL;
1239 state(hdlc)->dce_pvc_count = 0;
1240 }
1241 memcpy(&state(hdlc)->settings, &new_settings, size);
1242 dev->type = ARPHRD_FRAD;
1243 return 0;
1244
1245 case IF_PROTO_FR_ADD_PVC:
1246 case IF_PROTO_FR_DEL_PVC:
1247 case IF_PROTO_FR_ADD_ETH_PVC:
1248 case IF_PROTO_FR_DEL_ETH_PVC:
1249 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1250 return -EINVAL;
1251
1252 if (!capable(CAP_NET_ADMIN))
1253 return -EPERM;
1254
1255 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
1256 sizeof(fr_proto_pvc)))
1257 return -EFAULT;
1258
1259 if (pvc.dlci <= 0 || pvc.dlci >= 1024)
1260 return -EINVAL; /* Only 10 bits, DLCI 0 reserved */
1261
1262 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
1263 ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
1264 result = ARPHRD_ETHER; /* bridged Ethernet device */
1265 else
1266 result = ARPHRD_DLCI;
1267
1268 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
1269 ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
1270 return fr_add_pvc(dev, pvc.dlci, result);
1271 else
1272 return fr_del_pvc(hdlc, pvc.dlci, result);
1273 }
1274
1275 return -EINVAL;
1276 }
1277
1278
1279 static int __init mod_init(void)
1280 {
1281 register_hdlc_protocol(&proto);
1282 return 0;
1283 }
1284
1285
1286 static void __exit mod_exit(void)
1287 {
1288 unregister_hdlc_protocol(&proto);
1289 }
1290
1291
1292 module_init(mod_init);
1293 module_exit(mod_exit);
1294
1295 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
1296 MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC");
1297 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support