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[ARM] pxa: update defconfig for Verdex Pro
[linux-2.6/verdex.git] / drivers / net / wan / hdlc_cisco.c
blobf1bff98acd1fc8e1765b88d7d7195a740933b3dc
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 u32 txseq; /* TX sequence number, 0 = none */
62 u32 rxseq; /* RX sequence number */
63 };
64
65
66 static int cisco_ioctl(struct net_device *dev, struct ifreq *ifr);
67
68
69 static inline struct cisco_state* state(hdlc_device *hdlc)
70 {
71 return (struct cisco_state *)hdlc->state;
72 }
73
74
75 static int cisco_hard_header(struct sk_buff *skb, struct net_device *dev,
76 u16 type, const void *daddr, const void *saddr,
77 unsigned int len)
78 {
79 struct hdlc_header *data;
80 #ifdef DEBUG_HARD_HEADER
81 printk(KERN_DEBUG "%s: cisco_hard_header called\n", dev->name);
82 #endif
83
84 skb_push(skb, sizeof(struct hdlc_header));
85 data = (struct hdlc_header*)skb->data;
86 if (type == CISCO_KEEPALIVE)
87 data->address = CISCO_MULTICAST;
88 else
89 data->address = CISCO_UNICAST;
90 data->control = 0;
91 data->protocol = htons(type);
92
93 return sizeof(struct hdlc_header);
94 }
95
96
97
98 static void cisco_keepalive_send(struct net_device *dev, u32 type,
99 __be32 par1, __be32 par2)
100 {
101 struct sk_buff *skb;
102 struct cisco_packet *data;
103
104 skb = dev_alloc_skb(sizeof(struct hdlc_header) +
105 sizeof(struct cisco_packet));
106 if (!skb) {
107 printk(KERN_WARNING
108 "%s: Memory squeeze on cisco_keepalive_send()\n",
109 dev->name);
110 return;
111 }
112 skb_reserve(skb, 4);
113 cisco_hard_header(skb, dev, CISCO_KEEPALIVE, NULL, NULL, 0);
114 data = (struct cisco_packet*)(skb->data + 4);
115
116 data->type = htonl(type);
117 data->par1 = par1;
118 data->par2 = par2;
119 data->rel = cpu_to_be16(0xFFFF);
120 /* we will need do_div here if 1000 % HZ != 0 */
121 data->time = htonl((jiffies - INITIAL_JIFFIES) * (1000 / HZ));
122
123 skb_put(skb, sizeof(struct cisco_packet));
124 skb->priority = TC_PRIO_CONTROL;
125 skb->dev = dev;
126 skb_reset_network_header(skb);
127
128 dev_queue_xmit(skb);
129 }
130
131
132
133 static __be16 cisco_type_trans(struct sk_buff *skb, struct net_device *dev)
134 {
135 struct hdlc_header *data = (struct hdlc_header*)skb->data;
136
137 if (skb->len < sizeof(struct hdlc_header))
138 return cpu_to_be16(ETH_P_HDLC);
139
140 if (data->address != CISCO_MULTICAST &&
141 data->address != CISCO_UNICAST)
142 return cpu_to_be16(ETH_P_HDLC);
143
144 switch(data->protocol) {
145 case cpu_to_be16(ETH_P_IP):
146 case cpu_to_be16(ETH_P_IPX):
147 case cpu_to_be16(ETH_P_IPV6):
148 skb_pull(skb, sizeof(struct hdlc_header));
149 return data->protocol;
150 default:
151 return cpu_to_be16(ETH_P_HDLC);
152 }
153 }
154
155
156 static int cisco_rx(struct sk_buff *skb)
157 {
158 struct net_device *dev = skb->dev;
159 hdlc_device *hdlc = dev_to_hdlc(dev);
160 struct cisco_state *st = state(hdlc);
161 struct hdlc_header *data = (struct hdlc_header*)skb->data;
162 struct cisco_packet *cisco_data;
163 struct in_device *in_dev;
164 __be32 addr, mask;
165 u32 ack;
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 ack = ntohl(cisco_data->par2);
227 if (ack && (ack == st->txseq ||
228 /* our current REQ may be in transit */
229 ack == st->txseq - 1)) {
230 st->last_poll = jiffies;
231 if (!st->up) {
232 u32 sec, min, hrs, days;
233 sec = ntohl(cisco_data->time) / 1000;
234 min = sec / 60; sec -= min * 60;
235 hrs = min / 60; min -= hrs * 60;
236 days = hrs / 24; hrs -= days * 24;
237 printk(KERN_INFO "%s: Link up (peer "
238 "uptime %ud%uh%um%us)\n",
239 dev->name, days, hrs, min, sec);
240 netif_dormant_off(dev);
241 st->up = 1;
242 }
243 }
244 spin_unlock(&st->lock);
245
246 dev_kfree_skb_any(skb);
247 return NET_RX_SUCCESS;
248 } /* switch(keepalive type) */
249 } /* switch(protocol) */
250
251 printk(KERN_INFO "%s: Unsupported protocol %x\n", dev->name,
252 ntohs(data->protocol));
253 dev_kfree_skb_any(skb);
254 return NET_RX_DROP;
255
256 rx_error:
257 dev->stats.rx_errors++; /* Mark error */
258 dev_kfree_skb_any(skb);
259 return NET_RX_DROP;
260 }
261
262
263
264 static void cisco_timer(unsigned long arg)
265 {
266 struct net_device *dev = (struct net_device *)arg;
267 hdlc_device *hdlc = dev_to_hdlc(dev);
268 struct cisco_state *st = state(hdlc);
269
270 spin_lock(&st->lock);
271 if (st->up &&
272 time_after(jiffies, st->last_poll + st->settings.timeout * HZ)) {
273 st->up = 0;
274 printk(KERN_INFO "%s: Link down\n", dev->name);
275 netif_dormant_on(dev);
276 }
277
278 cisco_keepalive_send(dev, CISCO_KEEPALIVE_REQ, htonl(++st->txseq),
279 htonl(st->rxseq));
280 spin_unlock(&st->lock);
281
282 st->timer.expires = jiffies + st->settings.interval * HZ;
283 st->timer.function = cisco_timer;
284 st->timer.data = arg;
285 add_timer(&st->timer);
286 }
287
288
289
290 static void cisco_start(struct net_device *dev)
291 {
292 hdlc_device *hdlc = dev_to_hdlc(dev);
293 struct cisco_state *st = state(hdlc);
294 unsigned long flags;
295
296 spin_lock_irqsave(&st->lock, flags);
297 st->up = st->txseq = st->rxseq = 0;
298 spin_unlock_irqrestore(&st->lock, flags);
299
300 init_timer(&st->timer);
301 st->timer.expires = jiffies + HZ; /* First poll after 1 s */
302 st->timer.function = cisco_timer;
303 st->timer.data = (unsigned long)dev;
304 add_timer(&st->timer);
305 }
306
307
308
309 static void cisco_stop(struct net_device *dev)
310 {
311 hdlc_device *hdlc = dev_to_hdlc(dev);
312 struct cisco_state *st = state(hdlc);
313 unsigned long flags;
314
315 del_timer_sync(&st->timer);
316
317 spin_lock_irqsave(&st->lock, flags);
318 netif_dormant_on(dev);
319 st->up = st->txseq = 0;
320 spin_unlock_irqrestore(&st->lock, flags);
321 }
322
323
324 static struct hdlc_proto proto = {
325 .start = cisco_start,
326 .stop = cisco_stop,
327 .type_trans = cisco_type_trans,
328 .ioctl = cisco_ioctl,
329 .netif_rx = cisco_rx,
330 .module = THIS_MODULE,
331 };
332
333 static const struct header_ops cisco_header_ops = {
334 .create = cisco_hard_header,
335 };
336
337 static int cisco_ioctl(struct net_device *dev, struct ifreq *ifr)
338 {
339 cisco_proto __user *cisco_s = ifr->ifr_settings.ifs_ifsu.cisco;
340 const size_t size = sizeof(cisco_proto);
341 cisco_proto new_settings;
342 hdlc_device *hdlc = dev_to_hdlc(dev);
343 int result;
344
345 switch (ifr->ifr_settings.type) {
346 case IF_GET_PROTO:
347 if (dev_to_hdlc(dev)->proto != &proto)
348 return -EINVAL;
349 ifr->ifr_settings.type = IF_PROTO_CISCO;
350 if (ifr->ifr_settings.size < size) {
351 ifr->ifr_settings.size = size; /* data size wanted */
352 return -ENOBUFS;
353 }
354 if (copy_to_user(cisco_s, &state(hdlc)->settings, size))
355 return -EFAULT;
356 return 0;
357
358 case IF_PROTO_CISCO:
359 if (!capable(CAP_NET_ADMIN))
360 return -EPERM;
361
362 if (dev->flags & IFF_UP)
363 return -EBUSY;
364
365 if (copy_from_user(&new_settings, cisco_s, size))
366 return -EFAULT;
367
368 if (new_settings.interval < 1 ||
369 new_settings.timeout < 2)
370 return -EINVAL;
371
372 result = hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
373 if (result)
374 return result;
375
376 result = attach_hdlc_protocol(dev, &proto,
377 sizeof(struct cisco_state));
378 if (result)
379 return result;
380
381 memcpy(&state(hdlc)->settings, &new_settings, size);
382 spin_lock_init(&state(hdlc)->lock);
383 dev->header_ops = &cisco_header_ops;
384 dev->type = ARPHRD_CISCO;
385 netif_dormant_on(dev);
386 return 0;
387 }
388
389 return -EINVAL;
390 }
391
392
393 static int __init mod_init(void)
394 {
395 register_hdlc_protocol(&proto);
396 return 0;
397 }
398
399
400
401 static void __exit mod_exit(void)
402 {
403 unregister_hdlc_protocol(&proto);
404 }
405
406
407 module_init(mod_init);
408 module_exit(mod_exit);
409
410 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
411 MODULE_DESCRIPTION("Cisco HDLC protocol support for generic HDLC");
412 MODULE_LICENSE("GPL v2");
Verdex Pro support