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jbd2: Annotate transaction start also for jbd2_journal_restart()
[linux/fpc-iii.git] / drivers / net / wan / hdlc_cisco.c
blobcf5fd17ad7075b7f1753ff1c4d84f028ea03338b
1 /*
2 * Generic HDLC support routines for Linux
3 * Cisco HDLC support
4 *
5 * Copyright (C) 2000 - 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 #include <linux/errno.h>
13 #include <linux/hdlc.h>
14 #include <linux/if_arp.h>
15 #include <linux/inetdevice.h>
16 #include <linux/init.h>
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/pkt_sched.h>
20 #include <linux/poll.h>
21 #include <linux/rtnetlink.h>
22 #include <linux/skbuff.h>
23 #include <linux/slab.h>
24
25 #undef DEBUG_HARD_HEADER
26
27 #define CISCO_MULTICAST 0x8F /* Cisco multicast address */
28 #define CISCO_UNICAST 0x0F /* Cisco unicast address */
29 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */
30 #define CISCO_SYS_INFO 0x2000 /* Cisco interface/system info */
31 #define CISCO_ADDR_REQ 0 /* Cisco address request */
32 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */
33 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */
34
35
36 struct hdlc_header {
37 u8 address;
38 u8 control;
39 __be16 protocol;
40 }__attribute__ ((packed));
41
42
43 struct cisco_packet {
44 __be32 type; /* code */
45 __be32 par1;
46 __be32 par2;
47 __be16 rel; /* reliability */
48 __be32 time;
49 }__attribute__ ((packed));
50 #define CISCO_PACKET_LEN 18
51 #define CISCO_BIG_PACKET_LEN 20
52
53
54 struct cisco_state {
55 cisco_proto settings;
56
57 struct timer_list timer;
58 spinlock_t lock;
59 unsigned long last_poll;
60 int up;
61 int request_sent;
62 u32 txseq; /* TX sequence number */
63 u32 rxseq; /* RX sequence number */
64 };
65
66
67 static int cisco_ioctl(struct net_device *dev, struct ifreq *ifr);
68
69
70 static inline struct cisco_state* state(hdlc_device *hdlc)
71 {
72 return (struct cisco_state *)hdlc->state;
73 }
74
75
76 static int cisco_hard_header(struct sk_buff *skb, struct net_device *dev,
77 u16 type, const void *daddr, const void *saddr,
78 unsigned int len)
79 {
80 struct hdlc_header *data;
81 #ifdef DEBUG_HARD_HEADER
82 printk(KERN_DEBUG "%s: cisco_hard_header called\n", dev->name);
83 #endif
84
85 skb_push(skb, sizeof(struct hdlc_header));
86 data = (struct hdlc_header*)skb->data;
87 if (type == CISCO_KEEPALIVE)
88 data->address = CISCO_MULTICAST;
89 else
90 data->address = CISCO_UNICAST;
91 data->control = 0;
92 data->protocol = htons(type);
93
94 return sizeof(struct hdlc_header);
95 }
96
97
98
99 static void cisco_keepalive_send(struct net_device *dev, u32 type,
100 __be32 par1, __be32 par2)
101 {
102 struct sk_buff *skb;
103 struct cisco_packet *data;
104
105 skb = dev_alloc_skb(sizeof(struct hdlc_header) +
106 sizeof(struct cisco_packet));
107 if (!skb) {
108 printk(KERN_WARNING
109 "%s: Memory squeeze on cisco_keepalive_send()\n",
110 dev->name);
111 return;
112 }
113 skb_reserve(skb, 4);
114 cisco_hard_header(skb, dev, CISCO_KEEPALIVE, NULL, NULL, 0);
115 data = (struct cisco_packet*)(skb->data + 4);
116
117 data->type = htonl(type);
118 data->par1 = par1;
119 data->par2 = par2;
120 data->rel = cpu_to_be16(0xFFFF);
121 /* we will need do_div here if 1000 % HZ != 0 */
122 data->time = htonl((jiffies - INITIAL_JIFFIES) * (1000 / HZ));
123
124 skb_put(skb, sizeof(struct cisco_packet));
125 skb->priority = TC_PRIO_CONTROL;
126 skb->dev = dev;
127 skb_reset_network_header(skb);
128
129 dev_queue_xmit(skb);
130 }
131
132
133
134 static __be16 cisco_type_trans(struct sk_buff *skb, struct net_device *dev)
135 {
136 struct hdlc_header *data = (struct hdlc_header*)skb->data;
137
138 if (skb->len < sizeof(struct hdlc_header))
139 return cpu_to_be16(ETH_P_HDLC);
140
141 if (data->address != CISCO_MULTICAST &&
142 data->address != CISCO_UNICAST)
143 return cpu_to_be16(ETH_P_HDLC);
144
145 switch(data->protocol) {
146 case cpu_to_be16(ETH_P_IP):
147 case cpu_to_be16(ETH_P_IPX):
148 case cpu_to_be16(ETH_P_IPV6):
149 skb_pull(skb, sizeof(struct hdlc_header));
150 return data->protocol;
151 default:
152 return cpu_to_be16(ETH_P_HDLC);
153 }
154 }
155
156
157 static int cisco_rx(struct sk_buff *skb)
158 {
159 struct net_device *dev = skb->dev;
160 hdlc_device *hdlc = dev_to_hdlc(dev);
161 struct cisco_state *st = state(hdlc);
162 struct hdlc_header *data = (struct hdlc_header*)skb->data;
163 struct cisco_packet *cisco_data;
164 struct in_device *in_dev;
165 __be32 addr, mask;
166
167 if (skb->len < sizeof(struct hdlc_header))
168 goto rx_error;
169
170 if (data->address != CISCO_MULTICAST &&
171 data->address != CISCO_UNICAST)
172 goto rx_error;
173
174 switch (ntohs(data->protocol)) {
175 case CISCO_SYS_INFO:
176 /* Packet is not needed, drop it. */
177 dev_kfree_skb_any(skb);
178 return NET_RX_SUCCESS;
179
180 case CISCO_KEEPALIVE:
181 if ((skb->len != sizeof(struct hdlc_header) +
182 CISCO_PACKET_LEN) &&
183 (skb->len != sizeof(struct hdlc_header) +
184 CISCO_BIG_PACKET_LEN)) {
185 printk(KERN_INFO "%s: Invalid length of Cisco control"
186 " packet (%d bytes)\n", dev->name, skb->len);
187 goto rx_error;
188 }
189
190 cisco_data = (struct cisco_packet*)(skb->data + sizeof
191 (struct hdlc_header));
192
193 switch(ntohl (cisco_data->type)) {
194 case CISCO_ADDR_REQ: /* Stolen from syncppp.c :-) */
195 in_dev = dev->ip_ptr;
196 addr = 0;
197 mask = ~cpu_to_be32(0); /* is the mask correct? */
198
199 if (in_dev != NULL) {
200 struct in_ifaddr **ifap = &in_dev->ifa_list;
201
202 while (*ifap != NULL) {
203 if (strcmp(dev->name,
204 (*ifap)->ifa_label) == 0) {
205 addr = (*ifap)->ifa_local;
206 mask = (*ifap)->ifa_mask;
207 break;
208 }
209 ifap = &(*ifap)->ifa_next;
210 }
211
212 cisco_keepalive_send(dev, CISCO_ADDR_REPLY,
213 addr, mask);
214 }
215 dev_kfree_skb_any(skb);
216 return NET_RX_SUCCESS;
217
218 case CISCO_ADDR_REPLY:
219 printk(KERN_INFO "%s: Unexpected Cisco IP address "
220 "reply\n", dev->name);
221 goto rx_error;
222
223 case CISCO_KEEPALIVE_REQ:
224 spin_lock(&st->lock);
225 st->rxseq = ntohl(cisco_data->par1);
226 if (st->request_sent &&
227 ntohl(cisco_data->par2) == st->txseq) {
228 st->last_poll = jiffies;
229 if (!st->up) {
230 u32 sec, min, hrs, days;
231 sec = ntohl(cisco_data->time) / 1000;
232 min = sec / 60; sec -= min * 60;
233 hrs = min / 60; min -= hrs * 60;
234 days = hrs / 24; hrs -= days * 24;
235 printk(KERN_INFO "%s: Link up (peer "
236 "uptime %ud%uh%um%us)\n",
237 dev->name, days, hrs, min, sec);
238 netif_dormant_off(dev);
239 st->up = 1;
240 }
241 }
242 spin_unlock(&st->lock);
243
244 dev_kfree_skb_any(skb);
245 return NET_RX_SUCCESS;
246 } /* switch(keepalive type) */
247 } /* switch(protocol) */
248
249 printk(KERN_INFO "%s: Unsupported protocol %x\n", dev->name,
250 ntohs(data->protocol));
251 dev_kfree_skb_any(skb);
252 return NET_RX_DROP;
253
254 rx_error:
255 dev->stats.rx_errors++; /* Mark error */
256 dev_kfree_skb_any(skb);
257 return NET_RX_DROP;
258 }
259
260
261
262 static void cisco_timer(unsigned long arg)
263 {
264 struct net_device *dev = (struct net_device *)arg;
265 hdlc_device *hdlc = dev_to_hdlc(dev);
266 struct cisco_state *st = state(hdlc);
267
268 spin_lock(&st->lock);
269 if (st->up &&
270 time_after(jiffies, st->last_poll + st->settings.timeout * HZ)) {
271 st->up = 0;
272 printk(KERN_INFO "%s: Link down\n", dev->name);
273 netif_dormant_on(dev);
274 }
275
276 cisco_keepalive_send(dev, CISCO_KEEPALIVE_REQ, htonl(++st->txseq),
277 htonl(st->rxseq));
278 st->request_sent = 1;
279 spin_unlock(&st->lock);
280
281 st->timer.expires = jiffies + st->settings.interval * HZ;
282 st->timer.function = cisco_timer;
283 st->timer.data = arg;
284 add_timer(&st->timer);
285 }
286
287
288
289 static void cisco_start(struct net_device *dev)
290 {
291 hdlc_device *hdlc = dev_to_hdlc(dev);
292 struct cisco_state *st = state(hdlc);
293 unsigned long flags;
294
295 spin_lock_irqsave(&st->lock, flags);
296 st->up = 0;
297 st->request_sent = 0;
298 st->txseq = st->rxseq = 0;
299 spin_unlock_irqrestore(&st->lock, flags);
300
301 init_timer(&st->timer);
302 st->timer.expires = jiffies + HZ; /* First poll after 1 s */
303 st->timer.function = cisco_timer;
304 st->timer.data = (unsigned long)dev;
305 add_timer(&st->timer);
306 }
307
308
309
310 static void cisco_stop(struct net_device *dev)
311 {
312 hdlc_device *hdlc = dev_to_hdlc(dev);
313 struct cisco_state *st = state(hdlc);
314 unsigned long flags;
315
316 del_timer_sync(&st->timer);
317
318 spin_lock_irqsave(&st->lock, flags);
319 netif_dormant_on(dev);
320 st->up = 0;
321 st->request_sent = 0;
322 spin_unlock_irqrestore(&st->lock, flags);
323 }
324
325
326 static struct hdlc_proto proto = {
327 .start = cisco_start,
328 .stop = cisco_stop,
329 .type_trans = cisco_type_trans,
330 .ioctl = cisco_ioctl,
331 .netif_rx = cisco_rx,
332 .module = THIS_MODULE,
333 };
334
335 static const struct header_ops cisco_header_ops = {
336 .create = cisco_hard_header,
337 };
338
339 static int cisco_ioctl(struct net_device *dev, struct ifreq *ifr)
340 {
341 cisco_proto __user *cisco_s = ifr->ifr_settings.ifs_ifsu.cisco;
342 const size_t size = sizeof(cisco_proto);
343 cisco_proto new_settings;
344 hdlc_device *hdlc = dev_to_hdlc(dev);
345 int result;
346
347 switch (ifr->ifr_settings.type) {
348 case IF_GET_PROTO:
349 if (dev_to_hdlc(dev)->proto != &proto)
350 return -EINVAL;
351 ifr->ifr_settings.type = IF_PROTO_CISCO;
352 if (ifr->ifr_settings.size < size) {
353 ifr->ifr_settings.size = size; /* data size wanted */
354 return -ENOBUFS;
355 }
356 if (copy_to_user(cisco_s, &state(hdlc)->settings, size))
357 return -EFAULT;
358 return 0;
359
360 case IF_PROTO_CISCO:
361 if (!capable(CAP_NET_ADMIN))
362 return -EPERM;
363
364 if (dev->flags & IFF_UP)
365 return -EBUSY;
366
367 if (copy_from_user(&new_settings, cisco_s, size))
368 return -EFAULT;
369
370 if (new_settings.interval < 1 ||
371 new_settings.timeout < 2)
372 return -EINVAL;
373
374 result = hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
375 if (result)
376 return result;
377
378 result = attach_hdlc_protocol(dev, &proto,
379 sizeof(struct cisco_state));
380 if (result)
381 return result;
382
383 memcpy(&state(hdlc)->settings, &new_settings, size);
384 spin_lock_init(&state(hdlc)->lock);
385 dev->header_ops = &cisco_header_ops;
386 dev->type = ARPHRD_CISCO;
387 netif_dormant_on(dev);
388 return 0;
389 }
390
391 return -EINVAL;
392 }
393
394
395 static int __init mod_init(void)
396 {
397 register_hdlc_protocol(&proto);
398 return 0;
399 }
400
401
402
403 static void __exit mod_exit(void)
404 {
405 unregister_hdlc_protocol(&proto);
406 }
407
408
409 module_init(mod_init);
410 module_exit(mod_exit);
411
412 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
413 MODULE_DESCRIPTION("Cisco HDLC protocol support for generic HDLC");
414 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support