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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Generic HDLC support routines for Linux | |
3 | * Cisco HDLC support | |
4 | * | |
eb2a2fd9 | 5 | * Copyright (C) 2000 - 2006 Krzysztof Halasa <khc@pm.waw.pl> |
1da177e4 LT |
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 | ||
1da177e4 | 12 | #include <linux/errno.h> |
4dfce407 | 13 | #include <linux/hdlc.h> |
1da177e4 | 14 | #include <linux/if_arp.h> |
4dfce407 | 15 | #include <linux/inetdevice.h> |
1da177e4 | 16 | #include <linux/init.h> |
4dfce407 KH |
17 | #include <linux/kernel.h> |
18 | #include <linux/module.h> | |
1da177e4 | 19 | #include <linux/pkt_sched.h> |
4dfce407 | 20 | #include <linux/poll.h> |
1da177e4 | 21 | #include <linux/rtnetlink.h> |
4dfce407 KH |
22 | #include <linux/skbuff.h> |
23 | #include <linux/slab.h> | |
1da177e4 LT |
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 | ||
eb2a2fd9 KH |
36 | struct hdlc_header { |
37 | u8 address; | |
38 | u8 control; | |
abf17ffd | 39 | __be16 protocol; |
eb2a2fd9 KH |
40 | }__attribute__ ((packed)); |
41 | ||
42 | ||
43 | struct cisco_packet { | |
abf17ffd KH |
44 | __be32 type; /* code */ |
45 | __be32 par1; | |
46 | __be32 par2; | |
47 | __be16 rel; /* reliability */ | |
48 | __be32 time; | |
eb2a2fd9 KH |
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; | |
aff26e2f | 58 | spinlock_t lock; |
eb2a2fd9 KH |
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 | ||
4dfce407 | 70 | static inline struct cisco_state* state(hdlc_device *hdlc) |
eb2a2fd9 | 71 | { |
4dfce407 | 72 | return (struct cisco_state *)hdlc->state; |
eb2a2fd9 KH |
73 | } |
74 | ||
75 | ||
1da177e4 | 76 | static int cisco_hard_header(struct sk_buff *skb, struct net_device *dev, |
3b04ddde | 77 | u16 type, const void *daddr, const void *saddr, |
1da177e4 LT |
78 | unsigned int len) |
79 | { | |
eb2a2fd9 | 80 | struct hdlc_header *data; |
1da177e4 LT |
81 | #ifdef DEBUG_HARD_HEADER |
82 | printk(KERN_DEBUG "%s: cisco_hard_header called\n", dev->name); | |
83 | #endif | |
84 | ||
eb2a2fd9 KH |
85 | skb_push(skb, sizeof(struct hdlc_header)); |
86 | data = (struct hdlc_header*)skb->data; | |
1da177e4 LT |
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 | ||
eb2a2fd9 | 94 | return sizeof(struct hdlc_header); |
1da177e4 LT |
95 | } |
96 | ||
97 | ||
98 | ||
99 | static void cisco_keepalive_send(struct net_device *dev, u32 type, | |
abf17ffd | 100 | __be32 par1, __be32 par2) |
1da177e4 LT |
101 | { |
102 | struct sk_buff *skb; | |
eb2a2fd9 | 103 | struct cisco_packet *data; |
1da177e4 | 104 | |
eb2a2fd9 KH |
105 | skb = dev_alloc_skb(sizeof(struct hdlc_header) + |
106 | sizeof(struct cisco_packet)); | |
1da177e4 LT |
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); | |
eb2a2fd9 | 115 | data = (struct cisco_packet*)(skb->data + 4); |
1da177e4 LT |
116 | |
117 | data->type = htonl(type); | |
abf17ffd KH |
118 | data->par1 = par1; |
119 | data->par2 = par2; | |
120 | data->rel = __constant_htons(0xFFFF); | |
1da177e4 LT |
121 | /* we will need do_div here if 1000 % HZ != 0 */ |
122 | data->time = htonl((jiffies - INITIAL_JIFFIES) * (1000 / HZ)); | |
123 | ||
eb2a2fd9 | 124 | skb_put(skb, sizeof(struct cisco_packet)); |
1da177e4 LT |
125 | skb->priority = TC_PRIO_CONTROL; |
126 | skb->dev = dev; | |
c1d2bbe1 | 127 | skb_reset_network_header(skb); |
1da177e4 LT |
128 | |
129 | dev_queue_xmit(skb); | |
130 | } | |
131 | ||
132 | ||
133 | ||
ab611487 | 134 | static __be16 cisco_type_trans(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 135 | { |
eb2a2fd9 | 136 | struct hdlc_header *data = (struct hdlc_header*)skb->data; |
1da177e4 | 137 | |
eb2a2fd9 | 138 | if (skb->len < sizeof(struct hdlc_header)) |
1da177e4 LT |
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): | |
eb2a2fd9 | 149 | skb_pull(skb, sizeof(struct hdlc_header)); |
1da177e4 LT |
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); | |
aff26e2f | 161 | struct cisco_state *st = state(hdlc); |
eb2a2fd9 KH |
162 | struct hdlc_header *data = (struct hdlc_header*)skb->data; |
163 | struct cisco_packet *cisco_data; | |
1da177e4 | 164 | struct in_device *in_dev; |
a144ea4b | 165 | __be32 addr, mask; |
1da177e4 | 166 | |
eb2a2fd9 | 167 | if (skb->len < sizeof(struct hdlc_header)) |
1da177e4 LT |
168 | goto rx_error; |
169 | ||
170 | if (data->address != CISCO_MULTICAST && | |
171 | data->address != CISCO_UNICAST) | |
172 | goto rx_error; | |
173 | ||
4dfce407 | 174 | switch (ntohs(data->protocol)) { |
1da177e4 LT |
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: | |
eb2a2fd9 KH |
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); | |
1da177e4 LT |
187 | goto rx_error; |
188 | } | |
189 | ||
eb2a2fd9 KH |
190 | cisco_data = (struct cisco_packet*)(skb->data + sizeof |
191 | (struct hdlc_header)); | |
1da177e4 LT |
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; | |
abf17ffd | 197 | mask = __constant_htonl(~0); /* is the mask correct? */ |
1da177e4 LT |
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: | |
aff26e2f KH |
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) { | |
1da177e4 LT |
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", | |
aff26e2f | 237 | dev->name, days, hrs, min, sec); |
c2ce9204 | 238 | netif_dormant_off(dev); |
aff26e2f | 239 | st->up = 1; |
1da177e4 LT |
240 | } |
241 | } | |
aff26e2f | 242 | spin_unlock(&st->lock); |
1da177e4 LT |
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, | |
abf17ffd | 250 | ntohs(data->protocol)); |
1da177e4 LT |
251 | dev_kfree_skb_any(skb); |
252 | return NET_RX_DROP; | |
253 | ||
198191c4 KH |
254 | rx_error: |
255 | dev->stats.rx_errors++; /* Mark error */ | |
1da177e4 LT |
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); | |
aff26e2f | 266 | struct cisco_state *st = state(hdlc); |
1da177e4 | 267 | |
aff26e2f KH |
268 | spin_lock(&st->lock); |
269 | if (st->up && | |
270 | time_after(jiffies, st->last_poll + st->settings.timeout * HZ)) { | |
271 | st->up = 0; | |
1da177e4 | 272 | printk(KERN_INFO "%s: Link down\n", dev->name); |
c2ce9204 | 273 | netif_dormant_on(dev); |
1da177e4 LT |
274 | } |
275 | ||
aff26e2f KH |
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); | |
1da177e4 LT |
285 | } |
286 | ||
287 | ||
288 | ||
289 | static void cisco_start(struct net_device *dev) | |
290 | { | |
291 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
aff26e2f KH |
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); | |
1da177e4 LT |
306 | } |
307 | ||
308 | ||
309 | ||
310 | static void cisco_stop(struct net_device *dev) | |
311 | { | |
312 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
aff26e2f KH |
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); | |
c2ce9204 | 319 | netif_dormant_on(dev); |
aff26e2f KH |
320 | st->up = 0; |
321 | st->request_sent = 0; | |
322 | spin_unlock_irqrestore(&st->lock, flags); | |
1da177e4 LT |
323 | } |
324 | ||
325 | ||
eb2a2fd9 KH |
326 | static struct hdlc_proto proto = { |
327 | .start = cisco_start, | |
328 | .stop = cisco_stop, | |
329 | .type_trans = cisco_type_trans, | |
330 | .ioctl = cisco_ioctl, | |
40d25142 | 331 | .netif_rx = cisco_rx, |
eb2a2fd9 KH |
332 | .module = THIS_MODULE, |
333 | }; | |
3b04ddde SH |
334 | |
335 | static const struct header_ops cisco_header_ops = { | |
336 | .create = cisco_hard_header, | |
337 | }; | |
4dfce407 | 338 | |
eb2a2fd9 | 339 | static int cisco_ioctl(struct net_device *dev, struct ifreq *ifr) |
1da177e4 LT |
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: | |
eb2a2fd9 KH |
349 | if (dev_to_hdlc(dev)->proto != &proto) |
350 | return -EINVAL; | |
1da177e4 LT |
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 | } | |
eb2a2fd9 | 356 | if (copy_to_user(cisco_s, &state(hdlc)->settings, size)) |
1da177e4 LT |
357 | return -EFAULT; |
358 | return 0; | |
359 | ||
360 | case IF_PROTO_CISCO: | |
4dfce407 | 361 | if (!capable(CAP_NET_ADMIN)) |
1da177e4 LT |
362 | return -EPERM; |
363 | ||
4dfce407 | 364 | if (dev->flags & IFF_UP) |
1da177e4 LT |
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 | ||
4dfce407 | 374 | result = hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT); |
1da177e4 LT |
375 | if (result) |
376 | return result; | |
377 | ||
40d25142 | 378 | result = attach_hdlc_protocol(dev, &proto, |
eb2a2fd9 KH |
379 | sizeof(struct cisco_state)); |
380 | if (result) | |
381 | return result; | |
1da177e4 | 382 | |
eb2a2fd9 | 383 | memcpy(&state(hdlc)->settings, &new_settings, size); |
aff26e2f | 384 | spin_lock_init(&state(hdlc)->lock); |
3b04ddde | 385 | dev->header_ops = &cisco_header_ops; |
1da177e4 | 386 | dev->type = ARPHRD_CISCO; |
c2ce9204 | 387 | netif_dormant_on(dev); |
1da177e4 LT |
388 | return 0; |
389 | } | |
390 | ||
391 | return -EINVAL; | |
392 | } | |
eb2a2fd9 KH |
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"); |