xref: /openbmc/linux/drivers/net/wan/hdlc_fr.c (revision 643d1f7f)
1 /*
2  * Generic HDLC support routines for Linux
3  * Frame Relay support
4  *
5  * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
6  *
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms of version 2 of the GNU General Public License
9  * as published by the Free Software Foundation.
10  *
11 
12             Theory of PVC state
13 
14  DCE mode:
15 
16  (exist,new) -> 0,0 when "PVC create" or if "link unreliable"
17          0,x -> 1,1 if "link reliable" when sending FULL STATUS
18          1,1 -> 1,0 if received FULL STATUS ACK
19 
20  (active)    -> 0 when "ifconfig PVC down" or "link unreliable" or "PVC create"
21              -> 1 when "PVC up" and (exist,new) = 1,0
22 
23  DTE mode:
24  (exist,new,active) = FULL STATUS if "link reliable"
25 		    = 0, 0, 0 if "link unreliable"
26  No LMI:
27  active = open and "link reliable"
28  exist = new = not used
29 
30  CCITT LMI: ITU-T Q.933 Annex A
31  ANSI LMI: ANSI T1.617 Annex D
32  CISCO LMI: the original, aka "Gang of Four" LMI
33 
34 */
35 
36 #include <linux/module.h>
37 #include <linux/kernel.h>
38 #include <linux/slab.h>
39 #include <linux/poll.h>
40 #include <linux/errno.h>
41 #include <linux/if_arp.h>
42 #include <linux/init.h>
43 #include <linux/skbuff.h>
44 #include <linux/pkt_sched.h>
45 #include <linux/random.h>
46 #include <linux/inetdevice.h>
47 #include <linux/lapb.h>
48 #include <linux/rtnetlink.h>
49 #include <linux/etherdevice.h>
50 #include <linux/hdlc.h>
51 
52 #undef DEBUG_PKT
53 #undef DEBUG_ECN
54 #undef DEBUG_LINK
55 #undef DEBUG_PROTO
56 #undef DEBUG_PVC
57 
58 #define FR_UI			0x03
59 #define FR_PAD			0x00
60 
61 #define NLPID_IP		0xCC
62 #define NLPID_IPV6		0x8E
63 #define NLPID_SNAP		0x80
64 #define NLPID_PAD		0x00
65 #define NLPID_CCITT_ANSI_LMI	0x08
66 #define NLPID_CISCO_LMI		0x09
67 
68 
69 #define LMI_CCITT_ANSI_DLCI	   0 /* LMI DLCI */
70 #define LMI_CISCO_DLCI		1023
71 
72 #define LMI_CALLREF		0x00 /* Call Reference */
73 #define LMI_ANSI_LOCKSHIFT	0x95 /* ANSI locking shift */
74 #define LMI_ANSI_CISCO_REPTYPE	0x01 /* report type */
75 #define LMI_CCITT_REPTYPE	0x51
76 #define LMI_ANSI_CISCO_ALIVE	0x03 /* keep alive */
77 #define LMI_CCITT_ALIVE		0x53
78 #define LMI_ANSI_CISCO_PVCSTAT	0x07 /* PVC status */
79 #define LMI_CCITT_PVCSTAT	0x57
80 
81 #define LMI_FULLREP		0x00 /* full report  */
82 #define LMI_INTEGRITY		0x01 /* link integrity report */
83 #define LMI_SINGLE		0x02 /* single PVC report */
84 
85 #define LMI_STATUS_ENQUIRY      0x75
86 #define LMI_STATUS              0x7D /* reply */
87 
88 #define LMI_REPT_LEN               1 /* report type element length */
89 #define LMI_INTEG_LEN              2 /* link integrity element length */
90 
91 #define LMI_CCITT_CISCO_LENGTH	  13 /* LMI frame lengths */
92 #define LMI_ANSI_LENGTH		  14
93 
94 
95 typedef struct {
96 #if defined(__LITTLE_ENDIAN_BITFIELD)
97 	unsigned ea1:	1;
98 	unsigned cr:	1;
99 	unsigned dlcih:	6;
100 
101 	unsigned ea2:	1;
102 	unsigned de:	1;
103 	unsigned becn:	1;
104 	unsigned fecn:	1;
105 	unsigned dlcil:	4;
106 #else
107 	unsigned dlcih:	6;
108 	unsigned cr:	1;
109 	unsigned ea1:	1;
110 
111 	unsigned dlcil:	4;
112 	unsigned fecn:	1;
113 	unsigned becn:	1;
114 	unsigned de:	1;
115 	unsigned ea2:	1;
116 #endif
117 }__attribute__ ((packed)) fr_hdr;
118 
119 
120 typedef struct pvc_device_struct {
121 	struct net_device *frad;
122 	struct net_device *main;
123 	struct net_device *ether;	/* bridged Ethernet interface	*/
124 	struct pvc_device_struct *next;	/* Sorted in ascending DLCI order */
125 	int dlci;
126 	int open_count;
127 
128 	struct {
129 		unsigned int new: 1;
130 		unsigned int active: 1;
131 		unsigned int exist: 1;
132 		unsigned int deleted: 1;
133 		unsigned int fecn: 1;
134 		unsigned int becn: 1;
135 		unsigned int bandwidth;	/* Cisco LMI reporting only */
136 	}state;
137 }pvc_device;
138 
139 
140 struct frad_state {
141 	fr_proto settings;
142 	pvc_device *first_pvc;
143 	int dce_pvc_count;
144 
145 	struct timer_list timer;
146 	unsigned long last_poll;
147 	int reliable;
148 	int dce_changed;
149 	int request;
150 	int fullrep_sent;
151 	u32 last_errors; /* last errors bit list */
152 	u8 n391cnt;
153 	u8 txseq; /* TX sequence number */
154 	u8 rxseq; /* RX sequence number */
155 };
156 
157 
158 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr);
159 
160 
161 static inline u16 q922_to_dlci(u8 *hdr)
162 {
163 	return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
164 }
165 
166 
167 static inline void dlci_to_q922(u8 *hdr, u16 dlci)
168 {
169 	hdr[0] = (dlci >> 2) & 0xFC;
170 	hdr[1] = ((dlci << 4) & 0xF0) | 0x01;
171 }
172 
173 
174 static inline struct frad_state * state(hdlc_device *hdlc)
175 {
176 	return(struct frad_state *)(hdlc->state);
177 }
178 
179 
180 static __inline__ pvc_device* dev_to_pvc(struct net_device *dev)
181 {
182 	return dev->priv;
183 }
184 
185 
186 static inline pvc_device* find_pvc(hdlc_device *hdlc, u16 dlci)
187 {
188 	pvc_device *pvc = state(hdlc)->first_pvc;
189 
190 	while (pvc) {
191 		if (pvc->dlci == dlci)
192 			return pvc;
193 		if (pvc->dlci > dlci)
194 			return NULL; /* the listed is sorted */
195 		pvc = pvc->next;
196 	}
197 
198 	return NULL;
199 }
200 
201 
202 static pvc_device* add_pvc(struct net_device *dev, u16 dlci)
203 {
204 	hdlc_device *hdlc = dev_to_hdlc(dev);
205 	pvc_device *pvc, **pvc_p = &state(hdlc)->first_pvc;
206 
207 	while (*pvc_p) {
208 		if ((*pvc_p)->dlci == dlci)
209 			return *pvc_p;
210 		if ((*pvc_p)->dlci > dlci)
211 			break;	/* the list is sorted */
212 		pvc_p = &(*pvc_p)->next;
213 	}
214 
215 	pvc = kzalloc(sizeof(pvc_device), GFP_ATOMIC);
216 #ifdef DEBUG_PVC
217 	printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev);
218 #endif
219 	if (!pvc)
220 		return NULL;
221 
222 	pvc->dlci = dlci;
223 	pvc->frad = dev;
224 	pvc->next = *pvc_p;	/* Put it in the chain */
225 	*pvc_p = pvc;
226 	return pvc;
227 }
228 
229 
230 static inline int pvc_is_used(pvc_device *pvc)
231 {
232 	return pvc->main || pvc->ether;
233 }
234 
235 
236 static inline void pvc_carrier(int on, pvc_device *pvc)
237 {
238 	if (on) {
239 		if (pvc->main)
240 			if (!netif_carrier_ok(pvc->main))
241 				netif_carrier_on(pvc->main);
242 		if (pvc->ether)
243 			if (!netif_carrier_ok(pvc->ether))
244 				netif_carrier_on(pvc->ether);
245 	} else {
246 		if (pvc->main)
247 			if (netif_carrier_ok(pvc->main))
248 				netif_carrier_off(pvc->main);
249 		if (pvc->ether)
250 			if (netif_carrier_ok(pvc->ether))
251 				netif_carrier_off(pvc->ether);
252 	}
253 }
254 
255 
256 static inline void delete_unused_pvcs(hdlc_device *hdlc)
257 {
258 	pvc_device **pvc_p = &state(hdlc)->first_pvc;
259 
260 	while (*pvc_p) {
261 		if (!pvc_is_used(*pvc_p)) {
262 			pvc_device *pvc = *pvc_p;
263 #ifdef DEBUG_PVC
264 			printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc);
265 #endif
266 			*pvc_p = pvc->next;
267 			kfree(pvc);
268 			continue;
269 		}
270 		pvc_p = &(*pvc_p)->next;
271 	}
272 }
273 
274 
275 static inline struct net_device** get_dev_p(pvc_device *pvc, int type)
276 {
277 	if (type == ARPHRD_ETHER)
278 		return &pvc->ether;
279 	else
280 		return &pvc->main;
281 }
282 
283 
284 static int fr_hard_header(struct sk_buff **skb_p, u16 dlci)
285 {
286 	u16 head_len;
287 	struct sk_buff *skb = *skb_p;
288 
289 	switch (skb->protocol) {
290 	case __constant_htons(NLPID_CCITT_ANSI_LMI):
291 		head_len = 4;
292 		skb_push(skb, head_len);
293 		skb->data[3] = NLPID_CCITT_ANSI_LMI;
294 		break;
295 
296 	case __constant_htons(NLPID_CISCO_LMI):
297 		head_len = 4;
298 		skb_push(skb, head_len);
299 		skb->data[3] = NLPID_CISCO_LMI;
300 		break;
301 
302 	case __constant_htons(ETH_P_IP):
303 		head_len = 4;
304 		skb_push(skb, head_len);
305 		skb->data[3] = NLPID_IP;
306 		break;
307 
308 	case __constant_htons(ETH_P_IPV6):
309 		head_len = 4;
310 		skb_push(skb, head_len);
311 		skb->data[3] = NLPID_IPV6;
312 		break;
313 
314 	case __constant_htons(ETH_P_802_3):
315 		head_len = 10;
316 		if (skb_headroom(skb) < head_len) {
317 			struct sk_buff *skb2 = skb_realloc_headroom(skb,
318 								    head_len);
319 			if (!skb2)
320 				return -ENOBUFS;
321 			dev_kfree_skb(skb);
322 			skb = *skb_p = skb2;
323 		}
324 		skb_push(skb, head_len);
325 		skb->data[3] = FR_PAD;
326 		skb->data[4] = NLPID_SNAP;
327 		skb->data[5] = FR_PAD;
328 		skb->data[6] = 0x80;
329 		skb->data[7] = 0xC2;
330 		skb->data[8] = 0x00;
331 		skb->data[9] = 0x07; /* bridged Ethernet frame w/out FCS */
332 		break;
333 
334 	default:
335 		head_len = 10;
336 		skb_push(skb, head_len);
337 		skb->data[3] = FR_PAD;
338 		skb->data[4] = NLPID_SNAP;
339 		skb->data[5] = FR_PAD;
340 		skb->data[6] = FR_PAD;
341 		skb->data[7] = FR_PAD;
342 		*(__be16*)(skb->data + 8) = skb->protocol;
343 	}
344 
345 	dlci_to_q922(skb->data, dlci);
346 	skb->data[2] = FR_UI;
347 	return 0;
348 }
349 
350 
351 
352 static int pvc_open(struct net_device *dev)
353 {
354 	pvc_device *pvc = dev_to_pvc(dev);
355 
356 	if ((pvc->frad->flags & IFF_UP) == 0)
357 		return -EIO;  /* Frad must be UP in order to activate PVC */
358 
359 	if (pvc->open_count++ == 0) {
360 		hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
361 		if (state(hdlc)->settings.lmi == LMI_NONE)
362 			pvc->state.active = netif_carrier_ok(pvc->frad);
363 
364 		pvc_carrier(pvc->state.active, pvc);
365 		state(hdlc)->dce_changed = 1;
366 	}
367 	return 0;
368 }
369 
370 
371 
372 static int pvc_close(struct net_device *dev)
373 {
374 	pvc_device *pvc = dev_to_pvc(dev);
375 
376 	if (--pvc->open_count == 0) {
377 		hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
378 		if (state(hdlc)->settings.lmi == LMI_NONE)
379 			pvc->state.active = 0;
380 
381 		if (state(hdlc)->settings.dce) {
382 			state(hdlc)->dce_changed = 1;
383 			pvc->state.active = 0;
384 		}
385 	}
386 	return 0;
387 }
388 
389 
390 
391 static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
392 {
393 	pvc_device *pvc = dev_to_pvc(dev);
394 	fr_proto_pvc_info info;
395 
396 	if (ifr->ifr_settings.type == IF_GET_PROTO) {
397 		if (dev->type == ARPHRD_ETHER)
398 			ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
399 		else
400 			ifr->ifr_settings.type = IF_PROTO_FR_PVC;
401 
402 		if (ifr->ifr_settings.size < sizeof(info)) {
403 			/* data size wanted */
404 			ifr->ifr_settings.size = sizeof(info);
405 			return -ENOBUFS;
406 		}
407 
408 		info.dlci = pvc->dlci;
409 		memcpy(info.master, pvc->frad->name, IFNAMSIZ);
410 		if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
411 				 &info, sizeof(info)))
412 			return -EFAULT;
413 		return 0;
414 	}
415 
416 	return -EINVAL;
417 }
418 
419 
420 static inline struct net_device_stats *pvc_get_stats(struct net_device *dev)
421 {
422 	return &dev_to_desc(dev)->stats;
423 }
424 
425 
426 
427 static int pvc_xmit(struct sk_buff *skb, struct net_device *dev)
428 {
429 	pvc_device *pvc = dev_to_pvc(dev);
430 	struct net_device_stats *stats = pvc_get_stats(dev);
431 
432 	if (pvc->state.active) {
433 		if (dev->type == ARPHRD_ETHER) {
434 			int pad = ETH_ZLEN - skb->len;
435 			if (pad > 0) { /* Pad the frame with zeros */
436 				int len = skb->len;
437 				if (skb_tailroom(skb) < pad)
438 					if (pskb_expand_head(skb, 0, pad,
439 							     GFP_ATOMIC)) {
440 						stats->tx_dropped++;
441 						dev_kfree_skb(skb);
442 						return 0;
443 					}
444 				skb_put(skb, pad);
445 				memset(skb->data + len, 0, pad);
446 			}
447 			skb->protocol = __constant_htons(ETH_P_802_3);
448 		}
449 		if (!fr_hard_header(&skb, pvc->dlci)) {
450 			stats->tx_bytes += skb->len;
451 			stats->tx_packets++;
452 			if (pvc->state.fecn) /* TX Congestion counter */
453 				stats->tx_compressed++;
454 			skb->dev = pvc->frad;
455 			dev_queue_xmit(skb);
456 			return 0;
457 		}
458 	}
459 
460 	stats->tx_dropped++;
461 	dev_kfree_skb(skb);
462 	return 0;
463 }
464 
465 
466 
467 static int pvc_change_mtu(struct net_device *dev, int new_mtu)
468 {
469 	if ((new_mtu < 68) || (new_mtu > HDLC_MAX_MTU))
470 		return -EINVAL;
471 	dev->mtu = new_mtu;
472 	return 0;
473 }
474 
475 
476 
477 static inline void fr_log_dlci_active(pvc_device *pvc)
478 {
479 	printk(KERN_INFO "%s: DLCI %d [%s%s%s]%s %s\n",
480 	       pvc->frad->name,
481 	       pvc->dlci,
482 	       pvc->main ? pvc->main->name : "",
483 	       pvc->main && pvc->ether ? " " : "",
484 	       pvc->ether ? pvc->ether->name : "",
485 	       pvc->state.new ? " new" : "",
486 	       !pvc->state.exist ? "deleted" :
487 	       pvc->state.active ? "active" : "inactive");
488 }
489 
490 
491 
492 static inline u8 fr_lmi_nextseq(u8 x)
493 {
494 	x++;
495 	return x ? x : 1;
496 }
497 
498 
499 static void fr_lmi_send(struct net_device *dev, int fullrep)
500 {
501 	hdlc_device *hdlc = dev_to_hdlc(dev);
502 	struct sk_buff *skb;
503 	pvc_device *pvc = state(hdlc)->first_pvc;
504 	int lmi = state(hdlc)->settings.lmi;
505 	int dce = state(hdlc)->settings.dce;
506 	int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
507 	int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
508 	u8 *data;
509 	int i = 0;
510 
511 	if (dce && fullrep) {
512 		len += state(hdlc)->dce_pvc_count * (2 + stat_len);
513 		if (len > HDLC_MAX_MRU) {
514 			printk(KERN_WARNING "%s: Too many PVCs while sending "
515 			       "LMI full report\n", dev->name);
516 			return;
517 		}
518 	}
519 
520 	skb = dev_alloc_skb(len);
521 	if (!skb) {
522 		printk(KERN_WARNING "%s: Memory squeeze on fr_lmi_send()\n",
523 		       dev->name);
524 		return;
525 	}
526 	memset(skb->data, 0, len);
527 	skb_reserve(skb, 4);
528 	if (lmi == LMI_CISCO) {
529 		skb->protocol = __constant_htons(NLPID_CISCO_LMI);
530 		fr_hard_header(&skb, LMI_CISCO_DLCI);
531 	} else {
532 		skb->protocol = __constant_htons(NLPID_CCITT_ANSI_LMI);
533 		fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI);
534 	}
535 	data = skb_tail_pointer(skb);
536 	data[i++] = LMI_CALLREF;
537 	data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
538 	if (lmi == LMI_ANSI)
539 		data[i++] = LMI_ANSI_LOCKSHIFT;
540 	data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
541 		LMI_ANSI_CISCO_REPTYPE;
542 	data[i++] = LMI_REPT_LEN;
543 	data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
544 	data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
545 	data[i++] = LMI_INTEG_LEN;
546 	data[i++] = state(hdlc)->txseq =
547 		fr_lmi_nextseq(state(hdlc)->txseq);
548 	data[i++] = state(hdlc)->rxseq;
549 
550 	if (dce && fullrep) {
551 		while (pvc) {
552 			data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
553 				LMI_ANSI_CISCO_PVCSTAT;
554 			data[i++] = stat_len;
555 
556 			/* LMI start/restart */
557 			if (state(hdlc)->reliable && !pvc->state.exist) {
558 				pvc->state.exist = pvc->state.new = 1;
559 				fr_log_dlci_active(pvc);
560 			}
561 
562 			/* ifconfig PVC up */
563 			if (pvc->open_count && !pvc->state.active &&
564 			    pvc->state.exist && !pvc->state.new) {
565 				pvc_carrier(1, pvc);
566 				pvc->state.active = 1;
567 				fr_log_dlci_active(pvc);
568 			}
569 
570 			if (lmi == LMI_CISCO) {
571 				data[i] = pvc->dlci >> 8;
572 				data[i + 1] = pvc->dlci & 0xFF;
573 			} else {
574 				data[i] = (pvc->dlci >> 4) & 0x3F;
575 				data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
576 				data[i + 2] = 0x80;
577 			}
578 
579 			if (pvc->state.new)
580 				data[i + 2] |= 0x08;
581 			else if (pvc->state.active)
582 				data[i + 2] |= 0x02;
583 
584 			i += stat_len;
585 			pvc = pvc->next;
586 		}
587 	}
588 
589 	skb_put(skb, i);
590 	skb->priority = TC_PRIO_CONTROL;
591 	skb->dev = dev;
592 	skb_reset_network_header(skb);
593 
594 	dev_queue_xmit(skb);
595 }
596 
597 
598 
599 static void fr_set_link_state(int reliable, struct net_device *dev)
600 {
601 	hdlc_device *hdlc = dev_to_hdlc(dev);
602 	pvc_device *pvc = state(hdlc)->first_pvc;
603 
604 	state(hdlc)->reliable = reliable;
605 	if (reliable) {
606 		netif_dormant_off(dev);
607 		state(hdlc)->n391cnt = 0; /* Request full status */
608 		state(hdlc)->dce_changed = 1;
609 
610 		if (state(hdlc)->settings.lmi == LMI_NONE) {
611 			while (pvc) {	/* Activate all PVCs */
612 				pvc_carrier(1, pvc);
613 				pvc->state.exist = pvc->state.active = 1;
614 				pvc->state.new = 0;
615 				pvc = pvc->next;
616 			}
617 		}
618 	} else {
619 		netif_dormant_on(dev);
620 		while (pvc) {		/* Deactivate all PVCs */
621 			pvc_carrier(0, pvc);
622 			pvc->state.exist = pvc->state.active = 0;
623 			pvc->state.new = 0;
624 			if (!state(hdlc)->settings.dce)
625 				pvc->state.bandwidth = 0;
626 			pvc = pvc->next;
627 		}
628 	}
629 }
630 
631 
632 static void fr_timer(unsigned long arg)
633 {
634 	struct net_device *dev = (struct net_device *)arg;
635 	hdlc_device *hdlc = dev_to_hdlc(dev);
636 	int i, cnt = 0, reliable;
637 	u32 list;
638 
639 	if (state(hdlc)->settings.dce) {
640 		reliable = state(hdlc)->request &&
641 			time_before(jiffies, state(hdlc)->last_poll +
642 				    state(hdlc)->settings.t392 * HZ);
643 		state(hdlc)->request = 0;
644 	} else {
645 		state(hdlc)->last_errors <<= 1; /* Shift the list */
646 		if (state(hdlc)->request) {
647 			if (state(hdlc)->reliable)
648 				printk(KERN_INFO "%s: No LMI status reply "
649 				       "received\n", dev->name);
650 			state(hdlc)->last_errors |= 1;
651 		}
652 
653 		list = state(hdlc)->last_errors;
654 		for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1)
655 			cnt += (list & 1);	/* errors count */
656 
657 		reliable = (cnt < state(hdlc)->settings.n392);
658 	}
659 
660 	if (state(hdlc)->reliable != reliable) {
661 		printk(KERN_INFO "%s: Link %sreliable\n", dev->name,
662 		       reliable ? "" : "un");
663 		fr_set_link_state(reliable, dev);
664 	}
665 
666 	if (state(hdlc)->settings.dce)
667 		state(hdlc)->timer.expires = jiffies +
668 			state(hdlc)->settings.t392 * HZ;
669 	else {
670 		if (state(hdlc)->n391cnt)
671 			state(hdlc)->n391cnt--;
672 
673 		fr_lmi_send(dev, state(hdlc)->n391cnt == 0);
674 
675 		state(hdlc)->last_poll = jiffies;
676 		state(hdlc)->request = 1;
677 		state(hdlc)->timer.expires = jiffies +
678 			state(hdlc)->settings.t391 * HZ;
679 	}
680 
681 	state(hdlc)->timer.function = fr_timer;
682 	state(hdlc)->timer.data = arg;
683 	add_timer(&state(hdlc)->timer);
684 }
685 
686 
687 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
688 {
689 	hdlc_device *hdlc = dev_to_hdlc(dev);
690 	pvc_device *pvc;
691 	u8 rxseq, txseq;
692 	int lmi = state(hdlc)->settings.lmi;
693 	int dce = state(hdlc)->settings.dce;
694 	int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;
695 
696 	if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
697 			LMI_CCITT_CISCO_LENGTH)) {
698 		printk(KERN_INFO "%s: Short LMI frame\n", dev->name);
699 		return 1;
700 	}
701 
702 	if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
703 			     NLPID_CCITT_ANSI_LMI)) {
704 		printk(KERN_INFO "%s: Received non-LMI frame with LMI DLCI\n",
705 		       dev->name);
706 		return 1;
707 	}
708 
709 	if (skb->data[4] != LMI_CALLREF) {
710 		printk(KERN_INFO "%s: Invalid LMI Call reference (0x%02X)\n",
711 		       dev->name, skb->data[4]);
712 		return 1;
713 	}
714 
715 	if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
716 		printk(KERN_INFO "%s: Invalid LMI Message type (0x%02X)\n",
717 		       dev->name, skb->data[5]);
718 		return 1;
719 	}
720 
721 	if (lmi == LMI_ANSI) {
722 		if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
723 			printk(KERN_INFO "%s: Not ANSI locking shift in LMI"
724 			       " message (0x%02X)\n", dev->name, skb->data[6]);
725 			return 1;
726 		}
727 		i = 7;
728 	} else
729 		i = 6;
730 
731 	if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
732 			     LMI_ANSI_CISCO_REPTYPE)) {
733 		printk(KERN_INFO "%s: Not an LMI Report type IE (0x%02X)\n",
734 		       dev->name, skb->data[i]);
735 		return 1;
736 	}
737 
738 	if (skb->data[++i] != LMI_REPT_LEN) {
739 		printk(KERN_INFO "%s: Invalid LMI Report type IE length"
740 		       " (%u)\n", dev->name, skb->data[i]);
741 		return 1;
742 	}
743 
744 	reptype = skb->data[++i];
745 	if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
746 		printk(KERN_INFO "%s: Unsupported LMI Report type (0x%02X)\n",
747 		       dev->name, reptype);
748 		return 1;
749 	}
750 
751 	if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
752 			       LMI_ANSI_CISCO_ALIVE)) {
753 		printk(KERN_INFO "%s: Not an LMI Link integrity verification"
754 		       " IE (0x%02X)\n", dev->name, skb->data[i]);
755 		return 1;
756 	}
757 
758 	if (skb->data[++i] != LMI_INTEG_LEN) {
759 		printk(KERN_INFO "%s: Invalid LMI Link integrity verification"
760 		       " IE length (%u)\n", dev->name, skb->data[i]);
761 		return 1;
762 	}
763 	i++;
764 
765 	state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */
766 	rxseq = skb->data[i++];	/* Should confirm our sequence */
767 
768 	txseq = state(hdlc)->txseq;
769 
770 	if (dce)
771 		state(hdlc)->last_poll = jiffies;
772 
773 	error = 0;
774 	if (!state(hdlc)->reliable)
775 		error = 1;
776 
777 	if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */
778 		state(hdlc)->n391cnt = 0;
779 		error = 1;
780 	}
781 
782 	if (dce) {
783 		if (state(hdlc)->fullrep_sent && !error) {
784 /* Stop sending full report - the last one has been confirmed by DTE */
785 			state(hdlc)->fullrep_sent = 0;
786 			pvc = state(hdlc)->first_pvc;
787 			while (pvc) {
788 				if (pvc->state.new) {
789 					pvc->state.new = 0;
790 
791 /* Tell DTE that new PVC is now active */
792 					state(hdlc)->dce_changed = 1;
793 				}
794 				pvc = pvc->next;
795 			}
796 		}
797 
798 		if (state(hdlc)->dce_changed) {
799 			reptype = LMI_FULLREP;
800 			state(hdlc)->fullrep_sent = 1;
801 			state(hdlc)->dce_changed = 0;
802 		}
803 
804 		state(hdlc)->request = 1; /* got request */
805 		fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
806 		return 0;
807 	}
808 
809 	/* DTE */
810 
811 	state(hdlc)->request = 0; /* got response, no request pending */
812 
813 	if (error)
814 		return 0;
815 
816 	if (reptype != LMI_FULLREP)
817 		return 0;
818 
819 	pvc = state(hdlc)->first_pvc;
820 
821 	while (pvc) {
822 		pvc->state.deleted = 1;
823 		pvc = pvc->next;
824 	}
825 
826 	no_ram = 0;
827 	while (skb->len >= i + 2 + stat_len) {
828 		u16 dlci;
829 		u32 bw;
830 		unsigned int active, new;
831 
832 		if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
833 				       LMI_ANSI_CISCO_PVCSTAT)) {
834 			printk(KERN_INFO "%s: Not an LMI PVC status IE"
835 			       " (0x%02X)\n", dev->name, skb->data[i]);
836 			return 1;
837 		}
838 
839 		if (skb->data[++i] != stat_len) {
840 			printk(KERN_INFO "%s: Invalid LMI PVC status IE length"
841 			       " (%u)\n", dev->name, skb->data[i]);
842 			return 1;
843 		}
844 		i++;
845 
846 		new = !! (skb->data[i + 2] & 0x08);
847 		active = !! (skb->data[i + 2] & 0x02);
848 		if (lmi == LMI_CISCO) {
849 			dlci = (skb->data[i] << 8) | skb->data[i + 1];
850 			bw = (skb->data[i + 3] << 16) |
851 				(skb->data[i + 4] << 8) |
852 				(skb->data[i + 5]);
853 		} else {
854 			dlci = ((skb->data[i] & 0x3F) << 4) |
855 				((skb->data[i + 1] & 0x78) >> 3);
856 			bw = 0;
857 		}
858 
859 		pvc = add_pvc(dev, dlci);
860 
861 		if (!pvc && !no_ram) {
862 			printk(KERN_WARNING
863 			       "%s: Memory squeeze on fr_lmi_recv()\n",
864 			       dev->name);
865 			no_ram = 1;
866 		}
867 
868 		if (pvc) {
869 			pvc->state.exist = 1;
870 			pvc->state.deleted = 0;
871 			if (active != pvc->state.active ||
872 			    new != pvc->state.new ||
873 			    bw != pvc->state.bandwidth ||
874 			    !pvc->state.exist) {
875 				pvc->state.new = new;
876 				pvc->state.active = active;
877 				pvc->state.bandwidth = bw;
878 				pvc_carrier(active, pvc);
879 				fr_log_dlci_active(pvc);
880 			}
881 		}
882 
883 		i += stat_len;
884 	}
885 
886 	pvc = state(hdlc)->first_pvc;
887 
888 	while (pvc) {
889 		if (pvc->state.deleted && pvc->state.exist) {
890 			pvc_carrier(0, pvc);
891 			pvc->state.active = pvc->state.new = 0;
892 			pvc->state.exist = 0;
893 			pvc->state.bandwidth = 0;
894 			fr_log_dlci_active(pvc);
895 		}
896 		pvc = pvc->next;
897 	}
898 
899 	/* Next full report after N391 polls */
900 	state(hdlc)->n391cnt = state(hdlc)->settings.n391;
901 
902 	return 0;
903 }
904 
905 
906 static int fr_rx(struct sk_buff *skb)
907 {
908 	struct net_device *frad = skb->dev;
909 	hdlc_device *hdlc = dev_to_hdlc(frad);
910 	fr_hdr *fh = (fr_hdr*)skb->data;
911 	u8 *data = skb->data;
912 	u16 dlci;
913 	pvc_device *pvc;
914 	struct net_device *dev = NULL;
915 
916 	if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
917 		goto rx_error;
918 
919 	dlci = q922_to_dlci(skb->data);
920 
921 	if ((dlci == LMI_CCITT_ANSI_DLCI &&
922 	     (state(hdlc)->settings.lmi == LMI_ANSI ||
923 	      state(hdlc)->settings.lmi == LMI_CCITT)) ||
924 	    (dlci == LMI_CISCO_DLCI &&
925 	     state(hdlc)->settings.lmi == LMI_CISCO)) {
926 		if (fr_lmi_recv(frad, skb))
927 			goto rx_error;
928 		dev_kfree_skb_any(skb);
929 		return NET_RX_SUCCESS;
930 	}
931 
932 	pvc = find_pvc(hdlc, dlci);
933 	if (!pvc) {
934 #ifdef DEBUG_PKT
935 		printk(KERN_INFO "%s: No PVC for received frame's DLCI %d\n",
936 		       frad->name, dlci);
937 #endif
938 		dev_kfree_skb_any(skb);
939 		return NET_RX_DROP;
940 	}
941 
942 	if (pvc->state.fecn != fh->fecn) {
943 #ifdef DEBUG_ECN
944 		printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name,
945 		       dlci, fh->fecn ? "N" : "FF");
946 #endif
947 		pvc->state.fecn ^= 1;
948 	}
949 
950 	if (pvc->state.becn != fh->becn) {
951 #ifdef DEBUG_ECN
952 		printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name,
953 		       dlci, fh->becn ? "N" : "FF");
954 #endif
955 		pvc->state.becn ^= 1;
956 	}
957 
958 
959 	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
960 		dev_to_desc(frad)->stats.rx_dropped++;
961 		return NET_RX_DROP;
962 	}
963 
964 	if (data[3] == NLPID_IP) {
965 		skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
966 		dev = pvc->main;
967 		skb->protocol = htons(ETH_P_IP);
968 
969 	} else if (data[3] == NLPID_IPV6) {
970 		skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
971 		dev = pvc->main;
972 		skb->protocol = htons(ETH_P_IPV6);
973 
974 	} else if (skb->len > 10 && data[3] == FR_PAD &&
975 		   data[4] == NLPID_SNAP && data[5] == FR_PAD) {
976 		u16 oui = ntohs(*(__be16*)(data + 6));
977 		u16 pid = ntohs(*(__be16*)(data + 8));
978 		skb_pull(skb, 10);
979 
980 		switch ((((u32)oui) << 16) | pid) {
981 		case ETH_P_ARP: /* routed frame with SNAP */
982 		case ETH_P_IPX:
983 		case ETH_P_IP:	/* a long variant */
984 		case ETH_P_IPV6:
985 			dev = pvc->main;
986 			skb->protocol = htons(pid);
987 			break;
988 
989 		case 0x80C20007: /* bridged Ethernet frame */
990 			if ((dev = pvc->ether) != NULL)
991 				skb->protocol = eth_type_trans(skb, dev);
992 			break;
993 
994 		default:
995 			printk(KERN_INFO "%s: Unsupported protocol, OUI=%x "
996 			       "PID=%x\n", frad->name, oui, pid);
997 			dev_kfree_skb_any(skb);
998 			return NET_RX_DROP;
999 		}
1000 	} else {
1001 		printk(KERN_INFO "%s: Unsupported protocol, NLPID=%x "
1002 		       "length = %i\n", frad->name, data[3], skb->len);
1003 		dev_kfree_skb_any(skb);
1004 		return NET_RX_DROP;
1005 	}
1006 
1007 	if (dev) {
1008 		struct net_device_stats *stats = pvc_get_stats(dev);
1009 		stats->rx_packets++; /* PVC traffic */
1010 		stats->rx_bytes += skb->len;
1011 		if (pvc->state.becn)
1012 			stats->rx_compressed++;
1013 		netif_rx(skb);
1014 		return NET_RX_SUCCESS;
1015 	} else {
1016 		dev_kfree_skb_any(skb);
1017 		return NET_RX_DROP;
1018 	}
1019 
1020  rx_error:
1021 	dev_to_desc(frad)->stats.rx_errors++; /* Mark error */
1022 	dev_kfree_skb_any(skb);
1023 	return NET_RX_DROP;
1024 }
1025 
1026 
1027 
1028 static void fr_start(struct net_device *dev)
1029 {
1030 	hdlc_device *hdlc = dev_to_hdlc(dev);
1031 #ifdef DEBUG_LINK
1032 	printk(KERN_DEBUG "fr_start\n");
1033 #endif
1034 	if (state(hdlc)->settings.lmi != LMI_NONE) {
1035 		state(hdlc)->reliable = 0;
1036 		state(hdlc)->dce_changed = 1;
1037 		state(hdlc)->request = 0;
1038 		state(hdlc)->fullrep_sent = 0;
1039 		state(hdlc)->last_errors = 0xFFFFFFFF;
1040 		state(hdlc)->n391cnt = 0;
1041 		state(hdlc)->txseq = state(hdlc)->rxseq = 0;
1042 
1043 		init_timer(&state(hdlc)->timer);
1044 		/* First poll after 1 s */
1045 		state(hdlc)->timer.expires = jiffies + HZ;
1046 		state(hdlc)->timer.function = fr_timer;
1047 		state(hdlc)->timer.data = (unsigned long)dev;
1048 		add_timer(&state(hdlc)->timer);
1049 	} else
1050 		fr_set_link_state(1, dev);
1051 }
1052 
1053 
1054 static void fr_stop(struct net_device *dev)
1055 {
1056 	hdlc_device *hdlc = dev_to_hdlc(dev);
1057 #ifdef DEBUG_LINK
1058 	printk(KERN_DEBUG "fr_stop\n");
1059 #endif
1060 	if (state(hdlc)->settings.lmi != LMI_NONE)
1061 		del_timer_sync(&state(hdlc)->timer);
1062 	fr_set_link_state(0, dev);
1063 }
1064 
1065 
1066 static void fr_close(struct net_device *dev)
1067 {
1068 	hdlc_device *hdlc = dev_to_hdlc(dev);
1069 	pvc_device *pvc = state(hdlc)->first_pvc;
1070 
1071 	while (pvc) {		/* Shutdown all PVCs for this FRAD */
1072 		if (pvc->main)
1073 			dev_close(pvc->main);
1074 		if (pvc->ether)
1075 			dev_close(pvc->ether);
1076 		pvc = pvc->next;
1077 	}
1078 }
1079 
1080 
1081 static void pvc_setup(struct net_device *dev)
1082 {
1083 	dev->type = ARPHRD_DLCI;
1084 	dev->flags = IFF_POINTOPOINT;
1085 	dev->hard_header_len = 10;
1086 	dev->addr_len = 2;
1087 }
1088 
1089 static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
1090 {
1091 	hdlc_device *hdlc = dev_to_hdlc(frad);
1092 	pvc_device *pvc = NULL;
1093 	struct net_device *dev;
1094 	int result, used;
1095 	char * prefix = "pvc%d";
1096 
1097 	if (type == ARPHRD_ETHER)
1098 		prefix = "pvceth%d";
1099 
1100 	if ((pvc = add_pvc(frad, dlci)) == NULL) {
1101 		printk(KERN_WARNING "%s: Memory squeeze on fr_add_pvc()\n",
1102 		       frad->name);
1103 		return -ENOBUFS;
1104 	}
1105 
1106 	if (*get_dev_p(pvc, type))
1107 		return -EEXIST;
1108 
1109 	used = pvc_is_used(pvc);
1110 
1111 	if (type == ARPHRD_ETHER)
1112 		dev = alloc_netdev(sizeof(struct net_device_stats),
1113 				   "pvceth%d", ether_setup);
1114 	else
1115 		dev = alloc_netdev(sizeof(struct net_device_stats),
1116 				   "pvc%d", pvc_setup);
1117 
1118 	if (!dev) {
1119 		printk(KERN_WARNING "%s: Memory squeeze on fr_pvc()\n",
1120 		       frad->name);
1121 		delete_unused_pvcs(hdlc);
1122 		return -ENOBUFS;
1123 	}
1124 
1125 	if (type == ARPHRD_ETHER) {
1126 		memcpy(dev->dev_addr, "\x00\x01", 2);
1127                 get_random_bytes(dev->dev_addr + 2, ETH_ALEN - 2);
1128 	} else {
1129 		*(__be16*)dev->dev_addr = htons(dlci);
1130 		dlci_to_q922(dev->broadcast, dlci);
1131 	}
1132 	dev->hard_start_xmit = pvc_xmit;
1133 	dev->get_stats = pvc_get_stats;
1134 	dev->open = pvc_open;
1135 	dev->stop = pvc_close;
1136 	dev->do_ioctl = pvc_ioctl;
1137 	dev->change_mtu = pvc_change_mtu;
1138 	dev->mtu = HDLC_MAX_MTU;
1139 	dev->tx_queue_len = 0;
1140 	dev->priv = pvc;
1141 
1142 	result = dev_alloc_name(dev, dev->name);
1143 	if (result < 0) {
1144 		free_netdev(dev);
1145 		delete_unused_pvcs(hdlc);
1146 		return result;
1147 	}
1148 
1149 	if (register_netdevice(dev) != 0) {
1150 		free_netdev(dev);
1151 		delete_unused_pvcs(hdlc);
1152 		return -EIO;
1153 	}
1154 
1155 	dev->destructor = free_netdev;
1156 	*get_dev_p(pvc, type) = dev;
1157 	if (!used) {
1158 		state(hdlc)->dce_changed = 1;
1159 		state(hdlc)->dce_pvc_count++;
1160 	}
1161 	return 0;
1162 }
1163 
1164 
1165 
1166 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
1167 {
1168 	pvc_device *pvc;
1169 	struct net_device *dev;
1170 
1171 	if ((pvc = find_pvc(hdlc, dlci)) == NULL)
1172 		return -ENOENT;
1173 
1174 	if ((dev = *get_dev_p(pvc, type)) == NULL)
1175 		return -ENOENT;
1176 
1177 	if (dev->flags & IFF_UP)
1178 		return -EBUSY;		/* PVC in use */
1179 
1180 	unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
1181 	*get_dev_p(pvc, type) = NULL;
1182 
1183 	if (!pvc_is_used(pvc)) {
1184 		state(hdlc)->dce_pvc_count--;
1185 		state(hdlc)->dce_changed = 1;
1186 	}
1187 	delete_unused_pvcs(hdlc);
1188 	return 0;
1189 }
1190 
1191 
1192 
1193 static void fr_destroy(struct net_device *frad)
1194 {
1195 	hdlc_device *hdlc = dev_to_hdlc(frad);
1196 	pvc_device *pvc = state(hdlc)->first_pvc;
1197 	state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */
1198 	state(hdlc)->dce_pvc_count = 0;
1199 	state(hdlc)->dce_changed = 1;
1200 
1201 	while (pvc) {
1202 		pvc_device *next = pvc->next;
1203 		/* destructors will free_netdev() main and ether */
1204 		if (pvc->main)
1205 			unregister_netdevice(pvc->main);
1206 
1207 		if (pvc->ether)
1208 			unregister_netdevice(pvc->ether);
1209 
1210 		kfree(pvc);
1211 		pvc = next;
1212 	}
1213 }
1214 
1215 
1216 static struct hdlc_proto proto = {
1217 	.close		= fr_close,
1218 	.start		= fr_start,
1219 	.stop		= fr_stop,
1220 	.detach		= fr_destroy,
1221 	.ioctl		= fr_ioctl,
1222 	.module		= THIS_MODULE,
1223 };
1224 
1225 
1226 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr)
1227 {
1228 	fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
1229 	const size_t size = sizeof(fr_proto);
1230 	fr_proto new_settings;
1231 	hdlc_device *hdlc = dev_to_hdlc(dev);
1232 	fr_proto_pvc pvc;
1233 	int result;
1234 
1235 	switch (ifr->ifr_settings.type) {
1236 	case IF_GET_PROTO:
1237 		if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1238 			return -EINVAL;
1239 		ifr->ifr_settings.type = IF_PROTO_FR;
1240 		if (ifr->ifr_settings.size < size) {
1241 			ifr->ifr_settings.size = size; /* data size wanted */
1242 			return -ENOBUFS;
1243 		}
1244 		if (copy_to_user(fr_s, &state(hdlc)->settings, size))
1245 			return -EFAULT;
1246 		return 0;
1247 
1248 	case IF_PROTO_FR:
1249 		if(!capable(CAP_NET_ADMIN))
1250 			return -EPERM;
1251 
1252 		if(dev->flags & IFF_UP)
1253 			return -EBUSY;
1254 
1255 		if (copy_from_user(&new_settings, fr_s, size))
1256 			return -EFAULT;
1257 
1258 		if (new_settings.lmi == LMI_DEFAULT)
1259 			new_settings.lmi = LMI_ANSI;
1260 
1261 		if ((new_settings.lmi != LMI_NONE &&
1262 		     new_settings.lmi != LMI_ANSI &&
1263 		     new_settings.lmi != LMI_CCITT &&
1264 		     new_settings.lmi != LMI_CISCO) ||
1265 		    new_settings.t391 < 1 ||
1266 		    new_settings.t392 < 2 ||
1267 		    new_settings.n391 < 1 ||
1268 		    new_settings.n392 < 1 ||
1269 		    new_settings.n393 < new_settings.n392 ||
1270 		    new_settings.n393 > 32 ||
1271 		    (new_settings.dce != 0 &&
1272 		     new_settings.dce != 1))
1273 			return -EINVAL;
1274 
1275 		result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1276 		if (result)
1277 			return result;
1278 
1279 		if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */
1280 			result = attach_hdlc_protocol(dev, &proto, fr_rx,
1281 						      sizeof(struct frad_state));
1282 			if (result)
1283 				return result;
1284 			state(hdlc)->first_pvc = NULL;
1285 			state(hdlc)->dce_pvc_count = 0;
1286 		}
1287 		memcpy(&state(hdlc)->settings, &new_settings, size);
1288 
1289 		dev->hard_start_xmit = hdlc->xmit;
1290 		dev->type = ARPHRD_FRAD;
1291 		return 0;
1292 
1293 	case IF_PROTO_FR_ADD_PVC:
1294 	case IF_PROTO_FR_DEL_PVC:
1295 	case IF_PROTO_FR_ADD_ETH_PVC:
1296 	case IF_PROTO_FR_DEL_ETH_PVC:
1297 		if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1298 			return -EINVAL;
1299 
1300 		if(!capable(CAP_NET_ADMIN))
1301 			return -EPERM;
1302 
1303 		if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
1304 				   sizeof(fr_proto_pvc)))
1305 			return -EFAULT;
1306 
1307 		if (pvc.dlci <= 0 || pvc.dlci >= 1024)
1308 			return -EINVAL;	/* Only 10 bits, DLCI 0 reserved */
1309 
1310 		if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
1311 		    ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
1312 			result = ARPHRD_ETHER; /* bridged Ethernet device */
1313 		else
1314 			result = ARPHRD_DLCI;
1315 
1316 		if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
1317 		    ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
1318 			return fr_add_pvc(dev, pvc.dlci, result);
1319 		else
1320 			return fr_del_pvc(hdlc, pvc.dlci, result);
1321 	}
1322 
1323 	return -EINVAL;
1324 }
1325 
1326 
1327 static int __init mod_init(void)
1328 {
1329 	register_hdlc_protocol(&proto);
1330 	return 0;
1331 }
1332 
1333 
1334 static void __exit mod_exit(void)
1335 {
1336 	unregister_hdlc_protocol(&proto);
1337 }
1338 
1339 
1340 module_init(mod_init);
1341 module_exit(mod_exit);
1342 
1343 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
1344 MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC");
1345 MODULE_LICENSE("GPL v2");
1346