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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Generic HDLC support routines for Linux
3 * Frame Relay support
4 *
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02005 * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
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
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +020030 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070034*/
35
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <linux/errno.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <linux/etherdevice.h>
38#include <linux/hdlc.h>
Krzysztof Hałasa4dfce402008-06-30 19:06:40 +020039#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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
50#undef DEBUG_PKT
51#undef DEBUG_ECN
52#undef DEBUG_LINK
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +020053#undef DEBUG_PROTO
54#undef DEBUG_PVC
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +020056#define FR_UI 0x03
57#define FR_PAD 0x00
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +020059#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
66
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +020067#define LMI_CCITT_ANSI_DLCI 0 /* LMI DLCI */
68#define LMI_CISCO_DLCI 1023
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +020070#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +020079#define LMI_FULLREP 0x00 /* full report */
80#define LMI_INTEGRITY 0x01 /* link integrity report */
81#define LMI_SINGLE 0x02 /* single PVC report */
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
Linus Torvalds1da177e2005-04-16 15:20:36 -070083#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
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +020089#define LMI_CCITT_CISCO_LENGTH 13 /* LMI frame lengths */
90#define LMI_ANSI_LENGTH 14
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
92
93typedef struct {
94#if defined(__LITTLE_ENDIAN_BITFIELD)
95 unsigned ea1: 1;
96 unsigned cr: 1;
97 unsigned dlcih: 6;
Krzysztof Hałasa4dfce402008-06-30 19:06:40 +020098
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 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
Eric Dumazetba2d3582010-06-02 18:10:09 +0000115}__packed fr_hdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
117
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200118typedef struct pvc_device_struct {
119 struct net_device *frad;
120 struct net_device *main;
121 struct net_device *ether; /* bridged Ethernet interface */
122 struct pvc_device_struct *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}pvc_device;
136
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200137struct frad_state {
138 fr_proto settings;
139 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
155static int fr_ioctl(struct net_device *dev, struct ifreq *ifr);
156
157
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158static inline u16 q922_to_dlci(u8 *hdr)
159{
160 return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
161}
162
163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164static 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
Krzysztof Halasa983e2302008-02-01 22:34:30 +0100171static inline struct frad_state* state(hdlc_device *hdlc)
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200172{
173 return(struct frad_state *)(hdlc->state);
174}
175
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200176
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177static inline pvc_device* find_pvc(hdlc_device *hdlc, u16 dlci)
178{
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200179 pvc_device *pvc = state(hdlc)->first_pvc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
181 while (pvc) {
182 if (pvc->dlci == dlci)
183 return pvc;
184 if (pvc->dlci > dlci)
Rudy Matela870571a22009-11-25 10:20:20 -0300185 return NULL; /* the list is sorted */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 pvc = pvc->next;
187 }
188
189 return NULL;
190}
191
192
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200193static pvc_device* add_pvc(struct net_device *dev, u16 dlci)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194{
195 hdlc_device *hdlc = dev_to_hdlc(dev);
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200196 pvc_device *pvc, **pvc_p = &state(hdlc)->first_pvc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
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
Mariusz Kozlowski1ee32542007-08-10 15:24:50 -0700206 pvc = kzalloc(sizeof(pvc_device), GFP_ATOMIC);
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200207#ifdef DEBUG_PVC
208 printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev);
209#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 if (!pvc)
211 return NULL;
212
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 pvc->dlci = dlci;
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200214 pvc->frad = dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 pvc->next = *pvc_p; /* Put it in the chain */
216 *pvc_p = pvc;
217 return pvc;
218}
219
220
221static inline int pvc_is_used(pvc_device *pvc)
222{
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200223 return pvc->main || pvc->ether;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224}
225
226
227static inline void pvc_carrier(int on, 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
247static inline void delete_unused_pvcs(hdlc_device *hdlc)
248{
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200249 pvc_device **pvc_p = &state(hdlc)->first_pvc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
251 while (*pvc_p) {
252 if (!pvc_is_used(*pvc_p)) {
253 pvc_device *pvc = *pvc_p;
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200254#ifdef DEBUG_PVC
255 printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc);
256#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 *pvc_p = pvc->next;
258 kfree(pvc);
259 continue;
260 }
261 pvc_p = &(*pvc_p)->next;
262 }
263}
264
265
266static inline struct net_device** get_dev_p(pvc_device *pvc, int type)
267{
268 if (type == ARPHRD_ETHER)
269 return &pvc->ether;
270 else
271 return &pvc->main;
272}
273
274
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275static int fr_hard_header(struct sk_buff **skb_p, u16 dlci)
276{
277 u16 head_len;
278 struct sk_buff *skb = *skb_p;
279
280 switch (skb->protocol) {
Harvey Harrison09640e62009-02-01 00:45:17 -0800281 case cpu_to_be16(NLPID_CCITT_ANSI_LMI):
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200282 head_len = 4;
283 skb_push(skb, head_len);
284 skb->data[3] = NLPID_CCITT_ANSI_LMI;
285 break;
286
Harvey Harrison09640e62009-02-01 00:45:17 -0800287 case cpu_to_be16(NLPID_CISCO_LMI):
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200288 head_len = 4;
289 skb_push(skb, head_len);
290 skb->data[3] = NLPID_CISCO_LMI;
291 break;
292
Harvey Harrison09640e62009-02-01 00:45:17 -0800293 case cpu_to_be16(ETH_P_IP):
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 head_len = 4;
295 skb_push(skb, head_len);
296 skb->data[3] = NLPID_IP;
297 break;
298
Harvey Harrison09640e62009-02-01 00:45:17 -0800299 case cpu_to_be16(ETH_P_IPV6):
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 head_len = 4;
301 skb_push(skb, head_len);
302 skb->data[3] = NLPID_IPV6;
303 break;
304
Harvey Harrison09640e62009-02-01 00:45:17 -0800305 case cpu_to_be16(ETH_P_802_3):
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 head_len = 10;
307 if (skb_headroom(skb) < head_len) {
308 struct sk_buff *skb2 = skb_realloc_headroom(skb,
309 head_len);
310 if (!skb2)
311 return -ENOBUFS;
312 dev_kfree_skb(skb);
313 skb = *skb_p = skb2;
314 }
315 skb_push(skb, head_len);
316 skb->data[3] = FR_PAD;
317 skb->data[4] = NLPID_SNAP;
318 skb->data[5] = FR_PAD;
319 skb->data[6] = 0x80;
320 skb->data[7] = 0xC2;
321 skb->data[8] = 0x00;
322 skb->data[9] = 0x07; /* bridged Ethernet frame w/out FCS */
323 break;
324
325 default:
326 head_len = 10;
327 skb_push(skb, head_len);
328 skb->data[3] = FR_PAD;
329 skb->data[4] = NLPID_SNAP;
330 skb->data[5] = FR_PAD;
331 skb->data[6] = FR_PAD;
332 skb->data[7] = FR_PAD;
Krzysztof Halasaabf17ff2007-04-27 13:13:33 +0200333 *(__be16*)(skb->data + 8) = skb->protocol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 }
335
336 dlci_to_q922(skb->data, dlci);
337 skb->data[2] = FR_UI;
338 return 0;
339}
340
341
342
343static int pvc_open(struct net_device *dev)
344{
Wang Chen2baf8a22008-11-21 16:34:18 -0800345 pvc_device *pvc = dev->ml_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200347 if ((pvc->frad->flags & IFF_UP) == 0)
348 return -EIO; /* Frad must be UP in order to activate PVC */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
350 if (pvc->open_count++ == 0) {
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200351 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
352 if (state(hdlc)->settings.lmi == LMI_NONE)
353 pvc->state.active = netif_carrier_ok(pvc->frad);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
355 pvc_carrier(pvc->state.active, pvc);
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200356 state(hdlc)->dce_changed = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 }
358 return 0;
359}
360
361
362
363static int pvc_close(struct net_device *dev)
364{
Wang Chen2baf8a22008-11-21 16:34:18 -0800365 pvc_device *pvc = dev->ml_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
367 if (--pvc->open_count == 0) {
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200368 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
369 if (state(hdlc)->settings.lmi == LMI_NONE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 pvc->state.active = 0;
371
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200372 if (state(hdlc)->settings.dce) {
373 state(hdlc)->dce_changed = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 pvc->state.active = 0;
375 }
376 }
377 return 0;
378}
379
380
381
Adrian Bunk7665a082005-09-09 23:17:28 -0700382static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383{
Wang Chen2baf8a22008-11-21 16:34:18 -0800384 pvc_device *pvc = dev->ml_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 fr_proto_pvc_info info;
386
387 if (ifr->ifr_settings.type == IF_GET_PROTO) {
388 if (dev->type == ARPHRD_ETHER)
389 ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
390 else
391 ifr->ifr_settings.type = IF_PROTO_FR_PVC;
392
393 if (ifr->ifr_settings.size < sizeof(info)) {
394 /* data size wanted */
395 ifr->ifr_settings.size = sizeof(info);
396 return -ENOBUFS;
397 }
398
399 info.dlci = pvc->dlci;
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200400 memcpy(info.master, pvc->frad->name, IFNAMSIZ);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
402 &info, sizeof(info)))
403 return -EFAULT;
404 return 0;
405 }
406
407 return -EINVAL;
408}
409
Stephen Hemmingerd71a6742009-08-31 19:50:47 +0000410static netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411{
Wang Chen2baf8a22008-11-21 16:34:18 -0800412 pvc_device *pvc = dev->ml_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
414 if (pvc->state.active) {
415 if (dev->type == ARPHRD_ETHER) {
416 int pad = ETH_ZLEN - skb->len;
417 if (pad > 0) { /* Pad the frame with zeros */
418 int len = skb->len;
419 if (skb_tailroom(skb) < pad)
420 if (pskb_expand_head(skb, 0, pad,
421 GFP_ATOMIC)) {
Krzysztof Halasa198191c2008-06-30 23:26:53 +0200422 dev->stats.tx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 dev_kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000424 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 }
426 skb_put(skb, pad);
427 memset(skb->data + len, 0, pad);
428 }
Harvey Harrison09640e62009-02-01 00:45:17 -0800429 skb->protocol = cpu_to_be16(ETH_P_802_3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 }
431 if (!fr_hard_header(&skb, pvc->dlci)) {
Krzysztof Halasa198191c2008-06-30 23:26:53 +0200432 dev->stats.tx_bytes += skb->len;
433 dev->stats.tx_packets++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 if (pvc->state.fecn) /* TX Congestion counter */
Krzysztof Halasa198191c2008-06-30 23:26:53 +0200435 dev->stats.tx_compressed++;
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200436 skb->dev = pvc->frad;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 dev_queue_xmit(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000438 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 }
440 }
441
Krzysztof Halasa198191c2008-06-30 23:26:53 +0200442 dev->stats.tx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 dev_kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000444 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445}
446
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447static inline void fr_log_dlci_active(pvc_device *pvc)
448{
449 printk(KERN_INFO "%s: DLCI %d [%s%s%s]%s %s\n",
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200450 pvc->frad->name,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 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
462static inline u8 fr_lmi_nextseq(u8 x)
463{
464 x++;
465 return x ? x : 1;
466}
467
468
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469static void fr_lmi_send(struct net_device *dev, int fullrep)
470{
471 hdlc_device *hdlc = dev_to_hdlc(dev);
472 struct sk_buff *skb;
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200473 pvc_device *pvc = state(hdlc)->first_pvc;
474 int lmi = state(hdlc)->settings.lmi;
475 int dce = state(hdlc)->settings.dce;
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200476 int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
477 int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 u8 *data;
479 int i = 0;
480
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200481 if (dce && fullrep) {
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200482 len += state(hdlc)->dce_pvc_count * (2 + stat_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 if (len > HDLC_MAX_MRU) {
484 printk(KERN_WARNING "%s: Too many PVCs while sending "
485 "LMI full report\n", dev->name);
486 return;
487 }
488 }
489
490 skb = dev_alloc_skb(len);
491 if (!skb) {
492 printk(KERN_WARNING "%s: Memory squeeze on fr_lmi_send()\n",
493 dev->name);
494 return;
495 }
496 memset(skb->data, 0, len);
497 skb_reserve(skb, 4);
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200498 if (lmi == LMI_CISCO) {
Harvey Harrison09640e62009-02-01 00:45:17 -0800499 skb->protocol = cpu_to_be16(NLPID_CISCO_LMI);
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200500 fr_hard_header(&skb, LMI_CISCO_DLCI);
501 } else {
Harvey Harrison09640e62009-02-01 00:45:17 -0800502 skb->protocol = cpu_to_be16(NLPID_CCITT_ANSI_LMI);
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200503 fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI);
504 }
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700505 data = skb_tail_pointer(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 data[i++] = LMI_CALLREF;
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200507 data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
508 if (lmi == LMI_ANSI)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 data[i++] = LMI_ANSI_LOCKSHIFT;
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200510 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
511 LMI_ANSI_CISCO_REPTYPE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 data[i++] = LMI_REPT_LEN;
513 data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200514 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 data[i++] = LMI_INTEG_LEN;
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200516 data[i++] = state(hdlc)->txseq =
517 fr_lmi_nextseq(state(hdlc)->txseq);
518 data[i++] = state(hdlc)->rxseq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200520 if (dce && fullrep) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 while (pvc) {
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200522 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
523 LMI_ANSI_CISCO_PVCSTAT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 data[i++] = stat_len;
525
526 /* LMI start/restart */
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200527 if (state(hdlc)->reliable && !pvc->state.exist) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 pvc->state.exist = pvc->state.new = 1;
529 fr_log_dlci_active(pvc);
530 }
531
532 /* ifconfig PVC up */
533 if (pvc->open_count && !pvc->state.active &&
534 pvc->state.exist && !pvc->state.new) {
535 pvc_carrier(1, pvc);
536 pvc->state.active = 1;
537 fr_log_dlci_active(pvc);
538 }
539
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200540 if (lmi == LMI_CISCO) {
541 data[i] = pvc->dlci >> 8;
542 data[i + 1] = pvc->dlci & 0xFF;
543 } else {
544 data[i] = (pvc->dlci >> 4) & 0x3F;
545 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
546 data[i + 2] = 0x80;
547 }
548
549 if (pvc->state.new)
550 data[i + 2] |= 0x08;
551 else if (pvc->state.active)
552 data[i + 2] |= 0x02;
553
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 i += stat_len;
555 pvc = pvc->next;
556 }
557 }
558
559 skb_put(skb, i);
560 skb->priority = TC_PRIO_CONTROL;
561 skb->dev = dev;
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700562 skb_reset_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563
564 dev_queue_xmit(skb);
565}
566
567
568
569static void fr_set_link_state(int reliable, struct net_device *dev)
570{
571 hdlc_device *hdlc = dev_to_hdlc(dev);
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200572 pvc_device *pvc = state(hdlc)->first_pvc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200574 state(hdlc)->reliable = reliable;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 if (reliable) {
Krzysztof Halasac2ce9202006-07-12 13:46:12 -0700576 netif_dormant_off(dev);
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200577 state(hdlc)->n391cnt = 0; /* Request full status */
578 state(hdlc)->dce_changed = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200580 if (state(hdlc)->settings.lmi == LMI_NONE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 while (pvc) { /* Activate all PVCs */
582 pvc_carrier(1, pvc);
583 pvc->state.exist = pvc->state.active = 1;
584 pvc->state.new = 0;
585 pvc = pvc->next;
586 }
587 }
588 } else {
Krzysztof Halasac2ce9202006-07-12 13:46:12 -0700589 netif_dormant_on(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 while (pvc) { /* Deactivate all PVCs */
591 pvc_carrier(0, pvc);
592 pvc->state.exist = pvc->state.active = 0;
593 pvc->state.new = 0;
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200594 if (!state(hdlc)->settings.dce)
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200595 pvc->state.bandwidth = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 pvc = pvc->next;
597 }
598 }
599}
600
601
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602static void fr_timer(unsigned long arg)
603{
604 struct net_device *dev = (struct net_device *)arg;
605 hdlc_device *hdlc = dev_to_hdlc(dev);
606 int i, cnt = 0, reliable;
607 u32 list;
608
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200609 if (state(hdlc)->settings.dce) {
610 reliable = state(hdlc)->request &&
611 time_before(jiffies, state(hdlc)->last_poll +
612 state(hdlc)->settings.t392 * HZ);
613 state(hdlc)->request = 0;
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200614 } else {
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200615 state(hdlc)->last_errors <<= 1; /* Shift the list */
616 if (state(hdlc)->request) {
617 if (state(hdlc)->reliable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 printk(KERN_INFO "%s: No LMI status reply "
619 "received\n", dev->name);
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200620 state(hdlc)->last_errors |= 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 }
622
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200623 list = state(hdlc)->last_errors;
624 for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 cnt += (list & 1); /* errors count */
626
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200627 reliable = (cnt < state(hdlc)->settings.n392);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 }
629
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200630 if (state(hdlc)->reliable != reliable) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 printk(KERN_INFO "%s: Link %sreliable\n", dev->name,
632 reliable ? "" : "un");
633 fr_set_link_state(reliable, dev);
634 }
635
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200636 if (state(hdlc)->settings.dce)
637 state(hdlc)->timer.expires = jiffies +
638 state(hdlc)->settings.t392 * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 else {
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200640 if (state(hdlc)->n391cnt)
641 state(hdlc)->n391cnt--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200643 fr_lmi_send(dev, state(hdlc)->n391cnt == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200645 state(hdlc)->last_poll = jiffies;
646 state(hdlc)->request = 1;
647 state(hdlc)->timer.expires = jiffies +
648 state(hdlc)->settings.t391 * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 }
650
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200651 state(hdlc)->timer.function = fr_timer;
652 state(hdlc)->timer.data = arg;
653 add_timer(&state(hdlc)->timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654}
655
656
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
658{
659 hdlc_device *hdlc = dev_to_hdlc(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 pvc_device *pvc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 u8 rxseq, txseq;
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200662 int lmi = state(hdlc)->settings.lmi;
663 int dce = state(hdlc)->settings.dce;
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200664 int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200666 if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
667 LMI_CCITT_CISCO_LENGTH)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 printk(KERN_INFO "%s: Short LMI frame\n", dev->name);
669 return 1;
670 }
671
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200672 if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
673 NLPID_CCITT_ANSI_LMI)) {
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200674 printk(KERN_INFO "%s: Received non-LMI frame with LMI DLCI\n",
675 dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 return 1;
677 }
678
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200679 if (skb->data[4] != LMI_CALLREF) {
680 printk(KERN_INFO "%s: Invalid LMI Call reference (0x%02X)\n",
681 dev->name, skb->data[4]);
682 return 1;
683 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200685 if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
686 printk(KERN_INFO "%s: Invalid LMI Message type (0x%02X)\n",
687 dev->name, skb->data[5]);
688 return 1;
689 }
690
691 if (lmi == LMI_ANSI) {
692 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
693 printk(KERN_INFO "%s: Not ANSI locking shift in LMI"
694 " message (0x%02X)\n", dev->name, skb->data[6]);
695 return 1;
696 }
697 i = 7;
698 } else
699 i = 6;
700
701 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
702 LMI_ANSI_CISCO_REPTYPE)) {
703 printk(KERN_INFO "%s: Not an LMI Report type IE (0x%02X)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 dev->name, skb->data[i]);
705 return 1;
706 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200708 if (skb->data[++i] != LMI_REPT_LEN) {
709 printk(KERN_INFO "%s: Invalid LMI Report type IE length"
710 " (%u)\n", dev->name, skb->data[i]);
711 return 1;
712 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200714 reptype = skb->data[++i];
715 if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
716 printk(KERN_INFO "%s: Unsupported LMI Report type (0x%02X)\n",
717 dev->name, reptype);
718 return 1;
719 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200721 if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
722 LMI_ANSI_CISCO_ALIVE)) {
723 printk(KERN_INFO "%s: Not an LMI Link integrity verification"
724 " IE (0x%02X)\n", dev->name, skb->data[i]);
725 return 1;
726 }
727
728 if (skb->data[++i] != LMI_INTEG_LEN) {
729 printk(KERN_INFO "%s: Invalid LMI Link integrity verification"
730 " IE length (%u)\n", dev->name, skb->data[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 return 1;
732 }
733 i++;
734
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200735 state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 rxseq = skb->data[i++]; /* Should confirm our sequence */
737
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200738 txseq = state(hdlc)->txseq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200740 if (dce)
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200741 state(hdlc)->last_poll = jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742
743 error = 0;
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200744 if (!state(hdlc)->reliable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 error = 1;
746
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200747 if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */
748 state(hdlc)->n391cnt = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 error = 1;
750 }
751
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200752 if (dce) {
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200753 if (state(hdlc)->fullrep_sent && !error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754/* Stop sending full report - the last one has been confirmed by DTE */
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200755 state(hdlc)->fullrep_sent = 0;
756 pvc = state(hdlc)->first_pvc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 while (pvc) {
758 if (pvc->state.new) {
759 pvc->state.new = 0;
760
761/* Tell DTE that new PVC is now active */
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200762 state(hdlc)->dce_changed = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 }
764 pvc = pvc->next;
765 }
766 }
767
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200768 if (state(hdlc)->dce_changed) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 reptype = LMI_FULLREP;
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200770 state(hdlc)->fullrep_sent = 1;
771 state(hdlc)->dce_changed = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 }
773
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200774 state(hdlc)->request = 1; /* got request */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
776 return 0;
777 }
778
779 /* DTE */
780
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200781 state(hdlc)->request = 0; /* got response, no request pending */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782
783 if (error)
784 return 0;
785
786 if (reptype != LMI_FULLREP)
787 return 0;
788
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200789 pvc = state(hdlc)->first_pvc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790
791 while (pvc) {
792 pvc->state.deleted = 1;
793 pvc = pvc->next;
794 }
795
796 no_ram = 0;
797 while (skb->len >= i + 2 + stat_len) {
798 u16 dlci;
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200799 u32 bw;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 unsigned int active, new;
801
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200802 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
803 LMI_ANSI_CISCO_PVCSTAT)) {
804 printk(KERN_INFO "%s: Not an LMI PVC status IE"
805 " (0x%02X)\n", dev->name, skb->data[i]);
806 return 1;
807 }
808
809 if (skb->data[++i] != stat_len) {
810 printk(KERN_INFO "%s: Invalid LMI PVC status IE length"
811 " (%u)\n", dev->name, skb->data[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 return 1;
813 }
814 i++;
815
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200816 new = !! (skb->data[i + 2] & 0x08);
817 active = !! (skb->data[i + 2] & 0x02);
818 if (lmi == LMI_CISCO) {
819 dlci = (skb->data[i] << 8) | skb->data[i + 1];
820 bw = (skb->data[i + 3] << 16) |
821 (skb->data[i + 4] << 8) |
822 (skb->data[i + 5]);
823 } else {
824 dlci = ((skb->data[i] & 0x3F) << 4) |
825 ((skb->data[i + 1] & 0x78) >> 3);
826 bw = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828
829 pvc = add_pvc(dev, dlci);
830
831 if (!pvc && !no_ram) {
832 printk(KERN_WARNING
833 "%s: Memory squeeze on fr_lmi_recv()\n",
834 dev->name);
835 no_ram = 1;
836 }
837
838 if (pvc) {
839 pvc->state.exist = 1;
840 pvc->state.deleted = 0;
841 if (active != pvc->state.active ||
842 new != pvc->state.new ||
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200843 bw != pvc->state.bandwidth ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844 !pvc->state.exist) {
845 pvc->state.new = new;
846 pvc->state.active = active;
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200847 pvc->state.bandwidth = bw;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 pvc_carrier(active, pvc);
849 fr_log_dlci_active(pvc);
850 }
851 }
852
853 i += stat_len;
854 }
855
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200856 pvc = state(hdlc)->first_pvc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857
858 while (pvc) {
859 if (pvc->state.deleted && pvc->state.exist) {
860 pvc_carrier(0, pvc);
861 pvc->state.active = pvc->state.new = 0;
862 pvc->state.exist = 0;
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200863 pvc->state.bandwidth = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 fr_log_dlci_active(pvc);
865 }
866 pvc = pvc->next;
867 }
868
869 /* Next full report after N391 polls */
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200870 state(hdlc)->n391cnt = state(hdlc)->settings.n391;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
872 return 0;
873}
874
875
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876static int fr_rx(struct sk_buff *skb)
877{
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200878 struct net_device *frad = skb->dev;
879 hdlc_device *hdlc = dev_to_hdlc(frad);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 fr_hdr *fh = (fr_hdr*)skb->data;
881 u8 *data = skb->data;
882 u16 dlci;
883 pvc_device *pvc;
884 struct net_device *dev = NULL;
885
886 if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
887 goto rx_error;
888
889 dlci = q922_to_dlci(skb->data);
890
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200891 if ((dlci == LMI_CCITT_ANSI_DLCI &&
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200892 (state(hdlc)->settings.lmi == LMI_ANSI ||
893 state(hdlc)->settings.lmi == LMI_CCITT)) ||
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200894 (dlci == LMI_CISCO_DLCI &&
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200895 state(hdlc)->settings.lmi == LMI_CISCO)) {
896 if (fr_lmi_recv(frad, skb))
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +0200897 goto rx_error;
898 dev_kfree_skb_any(skb);
899 return NET_RX_SUCCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 }
901
902 pvc = find_pvc(hdlc, dlci);
903 if (!pvc) {
904#ifdef DEBUG_PKT
905 printk(KERN_INFO "%s: No PVC for received frame's DLCI %d\n",
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200906 frad->name, dlci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907#endif
908 dev_kfree_skb_any(skb);
909 return NET_RX_DROP;
910 }
911
912 if (pvc->state.fecn != fh->fecn) {
913#ifdef DEBUG_ECN
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200914 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 dlci, fh->fecn ? "N" : "FF");
916#endif
917 pvc->state.fecn ^= 1;
918 }
919
920 if (pvc->state.becn != fh->becn) {
921#ifdef DEBUG_ECN
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200922 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 dlci, fh->becn ? "N" : "FF");
924#endif
925 pvc->state.becn ^= 1;
926 }
927
928
929 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
Krzysztof Halasa198191c2008-06-30 23:26:53 +0200930 frad->stats.rx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 return NET_RX_DROP;
932 }
933
934 if (data[3] == NLPID_IP) {
935 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
936 dev = pvc->main;
937 skb->protocol = htons(ETH_P_IP);
938
939 } else if (data[3] == NLPID_IPV6) {
940 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
941 dev = pvc->main;
942 skb->protocol = htons(ETH_P_IPV6);
943
944 } else if (skb->len > 10 && data[3] == FR_PAD &&
945 data[4] == NLPID_SNAP && data[5] == FR_PAD) {
Krzysztof Halasaabf17ff2007-04-27 13:13:33 +0200946 u16 oui = ntohs(*(__be16*)(data + 6));
947 u16 pid = ntohs(*(__be16*)(data + 8));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 skb_pull(skb, 10);
949
950 switch ((((u32)oui) << 16) | pid) {
951 case ETH_P_ARP: /* routed frame with SNAP */
952 case ETH_P_IPX:
953 case ETH_P_IP: /* a long variant */
954 case ETH_P_IPV6:
955 dev = pvc->main;
956 skb->protocol = htons(pid);
957 break;
958
959 case 0x80C20007: /* bridged Ethernet frame */
960 if ((dev = pvc->ether) != NULL)
961 skb->protocol = eth_type_trans(skb, dev);
962 break;
963
964 default:
965 printk(KERN_INFO "%s: Unsupported protocol, OUI=%x "
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200966 "PID=%x\n", frad->name, oui, pid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 dev_kfree_skb_any(skb);
968 return NET_RX_DROP;
969 }
970 } else {
971 printk(KERN_INFO "%s: Unsupported protocol, NLPID=%x "
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200972 "length = %i\n", frad->name, data[3], skb->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973 dev_kfree_skb_any(skb);
974 return NET_RX_DROP;
975 }
976
977 if (dev) {
Krzysztof Halasa198191c2008-06-30 23:26:53 +0200978 dev->stats.rx_packets++; /* PVC traffic */
979 dev->stats.rx_bytes += skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 if (pvc->state.becn)
Krzysztof Halasa198191c2008-06-30 23:26:53 +0200981 dev->stats.rx_compressed++;
Krzysztof Halasa54364b72008-06-29 21:48:11 +0200982 skb->dev = dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 netif_rx(skb);
984 return NET_RX_SUCCESS;
985 } else {
986 dev_kfree_skb_any(skb);
987 return NET_RX_DROP;
988 }
989
990 rx_error:
Krzysztof Halasa198191c2008-06-30 23:26:53 +0200991 frad->stats.rx_errors++; /* Mark error */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992 dev_kfree_skb_any(skb);
993 return NET_RX_DROP;
994}
995
996
997
998static void fr_start(struct net_device *dev)
999{
1000 hdlc_device *hdlc = dev_to_hdlc(dev);
1001#ifdef DEBUG_LINK
1002 printk(KERN_DEBUG "fr_start\n");
1003#endif
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02001004 if (state(hdlc)->settings.lmi != LMI_NONE) {
1005 state(hdlc)->reliable = 0;
1006 state(hdlc)->dce_changed = 1;
1007 state(hdlc)->request = 0;
1008 state(hdlc)->fullrep_sent = 0;
1009 state(hdlc)->last_errors = 0xFFFFFFFF;
1010 state(hdlc)->n391cnt = 0;
1011 state(hdlc)->txseq = state(hdlc)->rxseq = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02001013 init_timer(&state(hdlc)->timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014 /* First poll after 1 s */
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02001015 state(hdlc)->timer.expires = jiffies + HZ;
1016 state(hdlc)->timer.function = fr_timer;
1017 state(hdlc)->timer.data = (unsigned long)dev;
1018 add_timer(&state(hdlc)->timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 } else
1020 fr_set_link_state(1, dev);
1021}
1022
1023
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024static void fr_stop(struct net_device *dev)
1025{
1026 hdlc_device *hdlc = dev_to_hdlc(dev);
1027#ifdef DEBUG_LINK
1028 printk(KERN_DEBUG "fr_stop\n");
1029#endif
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02001030 if (state(hdlc)->settings.lmi != LMI_NONE)
1031 del_timer_sync(&state(hdlc)->timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032 fr_set_link_state(0, dev);
1033}
1034
1035
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036static void fr_close(struct net_device *dev)
1037{
1038 hdlc_device *hdlc = dev_to_hdlc(dev);
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02001039 pvc_device *pvc = state(hdlc)->first_pvc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040
1041 while (pvc) { /* Shutdown all PVCs for this FRAD */
1042 if (pvc->main)
1043 dev_close(pvc->main);
1044 if (pvc->ether)
1045 dev_close(pvc->ether);
1046 pvc = pvc->next;
1047 }
1048}
1049
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02001050
1051static void pvc_setup(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052{
1053 dev->type = ARPHRD_DLCI;
1054 dev->flags = IFF_POINTOPOINT;
1055 dev->hard_header_len = 10;
1056 dev->addr_len = 2;
Eric Dumazet93f154b2009-05-18 22:19:19 -07001057 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058}
1059
Krzysztof Hałasa991990a2009-01-08 22:52:11 +01001060static const struct net_device_ops pvc_ops = {
1061 .ndo_open = pvc_open,
1062 .ndo_stop = pvc_close,
1063 .ndo_change_mtu = hdlc_change_mtu,
1064 .ndo_start_xmit = pvc_xmit,
1065 .ndo_do_ioctl = pvc_ioctl,
1066};
1067
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02001068static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069{
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02001070 hdlc_device *hdlc = dev_to_hdlc(frad);
Krzysztof Halasa141766c2008-07-01 14:42:07 +02001071 pvc_device *pvc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 struct net_device *dev;
Jiri Pirko1c5cae82011-04-30 01:21:32 +00001073 int used;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02001075 if ((pvc = add_pvc(frad, dlci)) == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 printk(KERN_WARNING "%s: Memory squeeze on fr_add_pvc()\n",
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02001077 frad->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078 return -ENOBUFS;
1079 }
1080
1081 if (*get_dev_p(pvc, type))
1082 return -EEXIST;
1083
1084 used = pvc_is_used(pvc);
1085
1086 if (type == ARPHRD_ETHER)
Krzysztof Halasa141766c2008-07-01 14:42:07 +02001087 dev = alloc_netdev(0, "pvceth%d", ether_setup);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088 else
Krzysztof Halasa141766c2008-07-01 14:42:07 +02001089 dev = alloc_netdev(0, "pvc%d", pvc_setup);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090
1091 if (!dev) {
1092 printk(KERN_WARNING "%s: Memory squeeze on fr_pvc()\n",
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02001093 frad->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094 delete_unused_pvcs(hdlc);
1095 return -ENOBUFS;
1096 }
1097
Krzysztof Halasa47eaa262008-02-01 22:39:50 +01001098 if (type == ARPHRD_ETHER)
1099 random_ether_addr(dev->dev_addr);
1100 else {
Krzysztof Halasaabf17ff2007-04-27 13:13:33 +02001101 *(__be16*)dev->dev_addr = htons(dlci);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102 dlci_to_q922(dev->broadcast, dlci);
1103 }
Krzysztof Hałasa991990a2009-01-08 22:52:11 +01001104 dev->netdev_ops = &pvc_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105 dev->mtu = HDLC_MAX_MTU;
1106 dev->tx_queue_len = 0;
Wang Chen2baf8a22008-11-21 16:34:18 -08001107 dev->ml_priv = pvc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 if (register_netdevice(dev) != 0) {
1110 free_netdev(dev);
1111 delete_unused_pvcs(hdlc);
1112 return -EIO;
1113 }
1114
1115 dev->destructor = free_netdev;
1116 *get_dev_p(pvc, type) = dev;
1117 if (!used) {
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02001118 state(hdlc)->dce_changed = 1;
1119 state(hdlc)->dce_pvc_count++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 }
1121 return 0;
1122}
1123
1124
1125
1126static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
1127{
1128 pvc_device *pvc;
1129 struct net_device *dev;
1130
1131 if ((pvc = find_pvc(hdlc, dlci)) == NULL)
1132 return -ENOENT;
1133
1134 if ((dev = *get_dev_p(pvc, type)) == NULL)
1135 return -ENOENT;
1136
1137 if (dev->flags & IFF_UP)
1138 return -EBUSY; /* PVC in use */
1139
1140 unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
1141 *get_dev_p(pvc, type) = NULL;
1142
1143 if (!pvc_is_used(pvc)) {
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02001144 state(hdlc)->dce_pvc_count--;
1145 state(hdlc)->dce_changed = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 }
1147 delete_unused_pvcs(hdlc);
1148 return 0;
1149}
1150
1151
1152
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02001153static void fr_destroy(struct net_device *frad)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154{
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02001155 hdlc_device *hdlc = dev_to_hdlc(frad);
1156 pvc_device *pvc = state(hdlc)->first_pvc;
1157 state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */
1158 state(hdlc)->dce_pvc_count = 0;
1159 state(hdlc)->dce_changed = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160
1161 while (pvc) {
1162 pvc_device *next = pvc->next;
1163 /* destructors will free_netdev() main and ether */
1164 if (pvc->main)
1165 unregister_netdevice(pvc->main);
1166
1167 if (pvc->ether)
1168 unregister_netdevice(pvc->ether);
1169
1170 kfree(pvc);
1171 pvc = next;
1172 }
1173}
1174
1175
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02001176static struct hdlc_proto proto = {
1177 .close = fr_close,
1178 .start = fr_start,
1179 .stop = fr_stop,
1180 .detach = fr_destroy,
1181 .ioctl = fr_ioctl,
Krzysztof Halasa40d25142008-02-01 22:37:12 +01001182 .netif_rx = fr_rx,
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02001183 .module = THIS_MODULE,
1184};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02001186
1187static int fr_ioctl(struct net_device *dev, struct ifreq *ifr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188{
1189 fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
1190 const size_t size = sizeof(fr_proto);
1191 fr_proto new_settings;
1192 hdlc_device *hdlc = dev_to_hdlc(dev);
1193 fr_proto_pvc pvc;
1194 int result;
1195
1196 switch (ifr->ifr_settings.type) {
1197 case IF_GET_PROTO:
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02001198 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1199 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200 ifr->ifr_settings.type = IF_PROTO_FR;
1201 if (ifr->ifr_settings.size < size) {
1202 ifr->ifr_settings.size = size; /* data size wanted */
1203 return -ENOBUFS;
1204 }
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02001205 if (copy_to_user(fr_s, &state(hdlc)->settings, size))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206 return -EFAULT;
1207 return 0;
1208
1209 case IF_PROTO_FR:
Rudy Matela6f7ad1e2009-11-29 23:42:42 -08001210 if (!capable(CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211 return -EPERM;
1212
Rudy Matela6f7ad1e2009-11-29 23:42:42 -08001213 if (dev->flags & IFF_UP)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214 return -EBUSY;
1215
1216 if (copy_from_user(&new_settings, fr_s, size))
1217 return -EFAULT;
1218
1219 if (new_settings.lmi == LMI_DEFAULT)
1220 new_settings.lmi = LMI_ANSI;
1221
1222 if ((new_settings.lmi != LMI_NONE &&
1223 new_settings.lmi != LMI_ANSI &&
Krzysztof Halasab3dd65f2005-04-21 15:57:25 +02001224 new_settings.lmi != LMI_CCITT &&
1225 new_settings.lmi != LMI_CISCO) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226 new_settings.t391 < 1 ||
1227 new_settings.t392 < 2 ||
1228 new_settings.n391 < 1 ||
1229 new_settings.n392 < 1 ||
1230 new_settings.n393 < new_settings.n392 ||
1231 new_settings.n393 > 32 ||
1232 (new_settings.dce != 0 &&
1233 new_settings.dce != 1))
1234 return -EINVAL;
1235
1236 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1237 if (result)
1238 return result;
1239
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02001240 if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */
Krzysztof Halasa40d25142008-02-01 22:37:12 +01001241 result = attach_hdlc_protocol(dev, &proto,
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02001242 sizeof(struct frad_state));
1243 if (result)
1244 return result;
1245 state(hdlc)->first_pvc = NULL;
1246 state(hdlc)->dce_pvc_count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247 }
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02001248 memcpy(&state(hdlc)->settings, &new_settings, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249 dev->type = ARPHRD_FRAD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 return 0;
1251
1252 case IF_PROTO_FR_ADD_PVC:
1253 case IF_PROTO_FR_DEL_PVC:
1254 case IF_PROTO_FR_ADD_ETH_PVC:
1255 case IF_PROTO_FR_DEL_ETH_PVC:
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02001256 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1257 return -EINVAL;
1258
Rudy Matela6f7ad1e2009-11-29 23:42:42 -08001259 if (!capable(CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260 return -EPERM;
1261
1262 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
1263 sizeof(fr_proto_pvc)))
1264 return -EFAULT;
1265
1266 if (pvc.dlci <= 0 || pvc.dlci >= 1024)
1267 return -EINVAL; /* Only 10 bits, DLCI 0 reserved */
1268
1269 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
1270 ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
1271 result = ARPHRD_ETHER; /* bridged Ethernet device */
1272 else
1273 result = ARPHRD_DLCI;
1274
1275 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
1276 ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
1277 return fr_add_pvc(dev, pvc.dlci, result);
1278 else
1279 return fr_del_pvc(hdlc, pvc.dlci, result);
1280 }
1281
1282 return -EINVAL;
1283}
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02001284
1285
1286static int __init mod_init(void)
1287{
1288 register_hdlc_protocol(&proto);
1289 return 0;
1290}
1291
1292
1293static void __exit mod_exit(void)
1294{
1295 unregister_hdlc_protocol(&proto);
1296}
1297
1298
1299module_init(mod_init);
1300module_exit(mod_exit);
1301
1302MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
1303MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC");
1304MODULE_LICENSE("GPL v2");