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sched: make early bootup sched_clock() use safer
[wrt350n-kernel.git] / drivers / net / wan / hdlc_cisco.c
blob7133c688cf20569e71aed38b83ca3db4bcd59896
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/module.h>
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/poll.h>
16 #include <linux/errno.h>
17 #include <linux/if_arp.h>
18 #include <linux/init.h>
19 #include <linux/skbuff.h>
20 #include <linux/pkt_sched.h>
21 #include <linux/inetdevice.h>
22 #include <linux/lapb.h>
23 #include <linux/rtnetlink.h>
24 #include <linux/hdlc.h>
25
26 #undef DEBUG_HARD_HEADER
27
28 #define CISCO_MULTICAST 0x8F /* Cisco multicast address */
29 #define CISCO_UNICAST 0x0F /* Cisco unicast address */
30 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */
31 #define CISCO_SYS_INFO 0x2000 /* Cisco interface/system info */
32 #define CISCO_ADDR_REQ 0 /* Cisco address request */
33 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */
34 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */
35
36
37 struct hdlc_header {
38 u8 address;
39 u8 control;
40 __be16 protocol;
41 }__attribute__ ((packed));
42
43
44 struct cisco_packet {
45 __be32 type; /* code */
46 __be32 par1;
47 __be32 par2;
48 __be16 rel; /* reliability */
49 __be32 time;
50 }__attribute__ ((packed));
51 #define CISCO_PACKET_LEN 18
52 #define CISCO_BIG_PACKET_LEN 20
53
54
55 struct cisco_state {
56 cisco_proto settings;
57
58 struct timer_list timer;
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 = __constant_htons(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 __constant_htons(ETH_P_HDLC);
140
141 if (data->address != CISCO_MULTICAST &&
142 data->address != CISCO_UNICAST)
143 return __constant_htons(ETH_P_HDLC);
144
145 switch(data->protocol) {
146 case __constant_htons(ETH_P_IP):
147 case __constant_htons(ETH_P_IPX):
148 case __constant_htons(ETH_P_IPV6):
149 skb_pull(skb, sizeof(struct hdlc_header));
150 return data->protocol;
151 default:
152 return __constant_htons(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 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
166 if (skb->len < sizeof(struct hdlc_header))
167 goto rx_error;
168
169 if (data->address != CISCO_MULTICAST &&
170 data->address != CISCO_UNICAST)
171 goto rx_error;
172
173 switch(ntohs(data->protocol)) {
174 case CISCO_SYS_INFO:
175 /* Packet is not needed, drop it. */
176 dev_kfree_skb_any(skb);
177 return NET_RX_SUCCESS;
178
179 case CISCO_KEEPALIVE:
180 if ((skb->len != sizeof(struct hdlc_header) +
181 CISCO_PACKET_LEN) &&
182 (skb->len != sizeof(struct hdlc_header) +
183 CISCO_BIG_PACKET_LEN)) {
184 printk(KERN_INFO "%s: Invalid length of Cisco control"
185 " packet (%d bytes)\n", dev->name, skb->len);
186 goto rx_error;
187 }
188
189 cisco_data = (struct cisco_packet*)(skb->data + sizeof
190 (struct hdlc_header));
191
192 switch(ntohl (cisco_data->type)) {
193 case CISCO_ADDR_REQ: /* Stolen from syncppp.c :-) */
194 in_dev = dev->ip_ptr;
195 addr = 0;
196 mask = __constant_htonl(~0); /* is the mask correct? */
197
198 if (in_dev != NULL) {
199 struct in_ifaddr **ifap = &in_dev->ifa_list;
200
201 while (*ifap != NULL) {
202 if (strcmp(dev->name,
203 (*ifap)->ifa_label) == 0) {
204 addr = (*ifap)->ifa_local;
205 mask = (*ifap)->ifa_mask;
206 break;
207 }
208 ifap = &(*ifap)->ifa_next;
209 }
210
211 cisco_keepalive_send(dev, CISCO_ADDR_REPLY,
212 addr, mask);
213 }
214 dev_kfree_skb_any(skb);
215 return NET_RX_SUCCESS;
216
217 case CISCO_ADDR_REPLY:
218 printk(KERN_INFO "%s: Unexpected Cisco IP address "
219 "reply\n", dev->name);
220 goto rx_error;
221
222 case CISCO_KEEPALIVE_REQ:
223 state(hdlc)->rxseq = ntohl(cisco_data->par1);
224 if (state(hdlc)->request_sent &&
225 ntohl(cisco_data->par2) == state(hdlc)->txseq) {
226 state(hdlc)->last_poll = jiffies;
227 if (!state(hdlc)->up) {
228 u32 sec, min, hrs, days;
229 sec = ntohl(cisco_data->time) / 1000;
230 min = sec / 60; sec -= min * 60;
231 hrs = min / 60; min -= hrs * 60;
232 days = hrs / 24; hrs -= days * 24;
233 printk(KERN_INFO "%s: Link up (peer "
234 "uptime %ud%uh%um%us)\n",
235 dev->name, days, hrs,
236 min, sec);
237 netif_dormant_off(dev);
238 state(hdlc)->up = 1;
239 }
240 }
241
242 dev_kfree_skb_any(skb);
243 return NET_RX_SUCCESS;
244 } /* switch(keepalive type) */
245 } /* switch(protocol) */
246
247 printk(KERN_INFO "%s: Unsupported protocol %x\n", dev->name,
248 ntohs(data->protocol));
249 dev_kfree_skb_any(skb);
250 return NET_RX_DROP;
251
252 rx_error:
253 dev_to_hdlc(dev)->stats.rx_errors++; /* Mark error */
254 dev_kfree_skb_any(skb);
255 return NET_RX_DROP;
256 }
257
258
259
260 static void cisco_timer(unsigned long arg)
261 {
262 struct net_device *dev = (struct net_device *)arg;
263 hdlc_device *hdlc = dev_to_hdlc(dev);
264
265 if (state(hdlc)->up &&
266 time_after(jiffies, state(hdlc)->last_poll +
267 state(hdlc)->settings.timeout * HZ)) {
268 state(hdlc)->up = 0;
269 printk(KERN_INFO "%s: Link down\n", dev->name);
270 netif_dormant_on(dev);
271 }
272
273 cisco_keepalive_send(dev, CISCO_KEEPALIVE_REQ,
274 htonl(++state(hdlc)->txseq),
275 htonl(state(hdlc)->rxseq));
276 state(hdlc)->request_sent = 1;
277 state(hdlc)->timer.expires = jiffies +
278 state(hdlc)->settings.interval * HZ;
279 state(hdlc)->timer.function = cisco_timer;
280 state(hdlc)->timer.data = arg;
281 add_timer(&state(hdlc)->timer);
282 }
283
284
285
286 static void cisco_start(struct net_device *dev)
287 {
288 hdlc_device *hdlc = dev_to_hdlc(dev);
289 state(hdlc)->up = 0;
290 state(hdlc)->request_sent = 0;
291 state(hdlc)->txseq = state(hdlc)->rxseq = 0;
292
293 init_timer(&state(hdlc)->timer);
294 state(hdlc)->timer.expires = jiffies + HZ; /*First poll after 1s*/
295 state(hdlc)->timer.function = cisco_timer;
296 state(hdlc)->timer.data = (unsigned long)dev;
297 add_timer(&state(hdlc)->timer);
298 }
299
300
301
302 static void cisco_stop(struct net_device *dev)
303 {
304 hdlc_device *hdlc = dev_to_hdlc(dev);
305 del_timer_sync(&state(hdlc)->timer);
306 netif_dormant_on(dev);
307 state(hdlc)->up = 0;
308 state(hdlc)->request_sent = 0;
309 }
310
311
312 static struct hdlc_proto proto = {
313 .start = cisco_start,
314 .stop = cisco_stop,
315 .type_trans = cisco_type_trans,
316 .ioctl = cisco_ioctl,
317 .netif_rx = cisco_rx,
318 .module = THIS_MODULE,
319 };
320
321 static const struct header_ops cisco_header_ops = {
322 .create = cisco_hard_header,
323 };
324
325 static int cisco_ioctl(struct net_device *dev, struct ifreq *ifr)
326 {
327 cisco_proto __user *cisco_s = ifr->ifr_settings.ifs_ifsu.cisco;
328 const size_t size = sizeof(cisco_proto);
329 cisco_proto new_settings;
330 hdlc_device *hdlc = dev_to_hdlc(dev);
331 int result;
332
333 switch (ifr->ifr_settings.type) {
334 case IF_GET_PROTO:
335 if (dev_to_hdlc(dev)->proto != &proto)
336 return -EINVAL;
337 ifr->ifr_settings.type = IF_PROTO_CISCO;
338 if (ifr->ifr_settings.size < size) {
339 ifr->ifr_settings.size = size; /* data size wanted */
340 return -ENOBUFS;
341 }
342 if (copy_to_user(cisco_s, &state(hdlc)->settings, size))
343 return -EFAULT;
344 return 0;
345
346 case IF_PROTO_CISCO:
347 if(!capable(CAP_NET_ADMIN))
348 return -EPERM;
349
350 if(dev->flags & IFF_UP)
351 return -EBUSY;
352
353 if (copy_from_user(&new_settings, cisco_s, size))
354 return -EFAULT;
355
356 if (new_settings.interval < 1 ||
357 new_settings.timeout < 2)
358 return -EINVAL;
359
360 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
361 if (result)
362 return result;
363
364 result = attach_hdlc_protocol(dev, &proto,
365 sizeof(struct cisco_state));
366 if (result)
367 return result;
368
369 memcpy(&state(hdlc)->settings, &new_settings, size);
370 dev->hard_start_xmit = hdlc->xmit;
371 dev->header_ops = &cisco_header_ops;
372 dev->type = ARPHRD_CISCO;
373 netif_dormant_on(dev);
374 return 0;
375 }
376
377 return -EINVAL;
378 }
379
380
381 static int __init mod_init(void)
382 {
383 register_hdlc_protocol(&proto);
384 return 0;
385 }
386
387
388
389 static void __exit mod_exit(void)
390 {
391 unregister_hdlc_protocol(&proto);
392 }
393
394
395 module_init(mod_init);
396 module_exit(mod_exit);
397
398 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
399 MODULE_DESCRIPTION("Cisco HDLC protocol support for generic HDLC");
400 MODULE_LICENSE("GPL v2");
WRT350N Kernel Patches