Commit | Line | Data |
---|---|---|
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; | |
9652041d | 61 | u32 txseq; /* TX sequence number, 0 = none */ |
eb2a2fd9 KH |
62 | u32 rxseq; /* RX sequence number */ |
63 | }; | |
64 | ||
65 | ||
66 | static int cisco_ioctl(struct net_device *dev, struct ifreq *ifr); | |
67 | ||
68 | ||
4dfce407 | 69 | static inline struct cisco_state* state(hdlc_device *hdlc) |
eb2a2fd9 | 70 | { |
4dfce407 | 71 | return (struct cisco_state *)hdlc->state; |
eb2a2fd9 KH |
72 | } |
73 | ||
74 | ||
1da177e4 | 75 | static int cisco_hard_header(struct sk_buff *skb, struct net_device *dev, |
3b04ddde | 76 | u16 type, const void *daddr, const void *saddr, |
1da177e4 LT |
77 | unsigned int len) |
78 | { | |
eb2a2fd9 | 79 | struct hdlc_header *data; |
1da177e4 LT |
80 | #ifdef DEBUG_HARD_HEADER |
81 | printk(KERN_DEBUG "%s: cisco_hard_header called\n", dev->name); | |
82 | #endif | |
83 | ||
eb2a2fd9 KH |
84 | skb_push(skb, sizeof(struct hdlc_header)); |
85 | data = (struct hdlc_header*)skb->data; | |
1da177e4 LT |
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 | ||
eb2a2fd9 | 93 | return sizeof(struct hdlc_header); |
1da177e4 LT |
94 | } |
95 | ||
96 | ||
97 | ||
98 | static void cisco_keepalive_send(struct net_device *dev, u32 type, | |
abf17ffd | 99 | __be32 par1, __be32 par2) |
1da177e4 LT |
100 | { |
101 | struct sk_buff *skb; | |
eb2a2fd9 | 102 | struct cisco_packet *data; |
1da177e4 | 103 | |
eb2a2fd9 KH |
104 | skb = dev_alloc_skb(sizeof(struct hdlc_header) + |
105 | sizeof(struct cisco_packet)); | |
1da177e4 LT |
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); | |
eb2a2fd9 | 114 | data = (struct cisco_packet*)(skb->data + 4); |
1da177e4 LT |
115 | |
116 | data->type = htonl(type); | |
abf17ffd KH |
117 | data->par1 = par1; |
118 | data->par2 = par2; | |
09640e63 | 119 | data->rel = cpu_to_be16(0xFFFF); |
1da177e4 LT |
120 | /* we will need do_div here if 1000 % HZ != 0 */ |
121 | data->time = htonl((jiffies - INITIAL_JIFFIES) * (1000 / HZ)); | |
122 | ||
eb2a2fd9 | 123 | skb_put(skb, sizeof(struct cisco_packet)); |
1da177e4 LT |
124 | skb->priority = TC_PRIO_CONTROL; |
125 | skb->dev = dev; | |
c1d2bbe1 | 126 | skb_reset_network_header(skb); |
1da177e4 LT |
127 | |
128 | dev_queue_xmit(skb); | |
129 | } | |
130 | ||
131 | ||
132 | ||
ab611487 | 133 | static __be16 cisco_type_trans(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 134 | { |
eb2a2fd9 | 135 | struct hdlc_header *data = (struct hdlc_header*)skb->data; |
1da177e4 | 136 | |
eb2a2fd9 | 137 | if (skb->len < sizeof(struct hdlc_header)) |
09640e63 | 138 | return cpu_to_be16(ETH_P_HDLC); |
1da177e4 LT |
139 | |
140 | if (data->address != CISCO_MULTICAST && | |
141 | data->address != CISCO_UNICAST) | |
09640e63 | 142 | return cpu_to_be16(ETH_P_HDLC); |
1da177e4 LT |
143 | |
144 | switch(data->protocol) { | |
09640e63 HH |
145 | case cpu_to_be16(ETH_P_IP): |
146 | case cpu_to_be16(ETH_P_IPX): | |
147 | case cpu_to_be16(ETH_P_IPV6): | |
eb2a2fd9 | 148 | skb_pull(skb, sizeof(struct hdlc_header)); |
1da177e4 LT |
149 | return data->protocol; |
150 | default: | |
09640e63 | 151 | return cpu_to_be16(ETH_P_HDLC); |
1da177e4 LT |
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); | |
aff26e2f | 160 | struct cisco_state *st = state(hdlc); |
eb2a2fd9 KH |
161 | struct hdlc_header *data = (struct hdlc_header*)skb->data; |
162 | struct cisco_packet *cisco_data; | |
1da177e4 | 163 | struct in_device *in_dev; |
a144ea4b | 164 | __be32 addr, mask; |
9652041d | 165 | u32 ack; |
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; | |
09640e63 | 197 | mask = ~cpu_to_be32(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); | |
9652041d KH |
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)) { | |
aff26e2f KH |
230 | st->last_poll = jiffies; |
231 | if (!st->up) { | |
1da177e4 LT |
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", | |
aff26e2f | 239 | dev->name, days, hrs, min, sec); |
c2ce9204 | 240 | netif_dormant_off(dev); |
aff26e2f | 241 | st->up = 1; |
1da177e4 LT |
242 | } |
243 | } | |
aff26e2f | 244 | spin_unlock(&st->lock); |
1da177e4 LT |
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, | |
abf17ffd | 252 | ntohs(data->protocol)); |
1da177e4 LT |
253 | dev_kfree_skb_any(skb); |
254 | return NET_RX_DROP; | |
255 | ||
198191c4 KH |
256 | rx_error: |
257 | dev->stats.rx_errors++; /* Mark error */ | |
1da177e4 LT |
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); | |
aff26e2f | 268 | struct cisco_state *st = state(hdlc); |
1da177e4 | 269 | |
aff26e2f KH |
270 | spin_lock(&st->lock); |
271 | if (st->up && | |
272 | time_after(jiffies, st->last_poll + st->settings.timeout * HZ)) { | |
273 | st->up = 0; | |
1da177e4 | 274 | printk(KERN_INFO "%s: Link down\n", dev->name); |
c2ce9204 | 275 | netif_dormant_on(dev); |
1da177e4 LT |
276 | } |
277 | ||
aff26e2f KH |
278 | cisco_keepalive_send(dev, CISCO_KEEPALIVE_REQ, htonl(++st->txseq), |
279 | htonl(st->rxseq)); | |
aff26e2f KH |
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); | |
1da177e4 LT |
286 | } |
287 | ||
288 | ||
289 | ||
290 | static void cisco_start(struct net_device *dev) | |
291 | { | |
292 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
aff26e2f KH |
293 | struct cisco_state *st = state(hdlc); |
294 | unsigned long flags; | |
295 | ||
296 | spin_lock_irqsave(&st->lock, flags); | |
9652041d | 297 | st->up = st->txseq = st->rxseq = 0; |
aff26e2f KH |
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); | |
1da177e4 LT |
305 | } |
306 | ||
307 | ||
308 | ||
309 | static void cisco_stop(struct net_device *dev) | |
310 | { | |
311 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
aff26e2f KH |
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); | |
c2ce9204 | 318 | netif_dormant_on(dev); |
9652041d | 319 | st->up = st->txseq = 0; |
aff26e2f | 320 | spin_unlock_irqrestore(&st->lock, flags); |
1da177e4 LT |
321 | } |
322 | ||
323 | ||
eb2a2fd9 KH |
324 | static struct hdlc_proto proto = { |
325 | .start = cisco_start, | |
326 | .stop = cisco_stop, | |
327 | .type_trans = cisco_type_trans, | |
328 | .ioctl = cisco_ioctl, | |
40d25142 | 329 | .netif_rx = cisco_rx, |
eb2a2fd9 KH |
330 | .module = THIS_MODULE, |
331 | }; | |
3b04ddde SH |
332 | |
333 | static const struct header_ops cisco_header_ops = { | |
334 | .create = cisco_hard_header, | |
335 | }; | |
4dfce407 | 336 | |
eb2a2fd9 | 337 | static int cisco_ioctl(struct net_device *dev, struct ifreq *ifr) |
1da177e4 LT |
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: | |
eb2a2fd9 KH |
347 | if (dev_to_hdlc(dev)->proto != &proto) |
348 | return -EINVAL; | |
1da177e4 LT |
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 | } | |
eb2a2fd9 | 354 | if (copy_to_user(cisco_s, &state(hdlc)->settings, size)) |
1da177e4 LT |
355 | return -EFAULT; |
356 | return 0; | |
357 | ||
358 | case IF_PROTO_CISCO: | |
4dfce407 | 359 | if (!capable(CAP_NET_ADMIN)) |
1da177e4 LT |
360 | return -EPERM; |
361 | ||
4dfce407 | 362 | if (dev->flags & IFF_UP) |
1da177e4 LT |
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 | ||
4dfce407 | 372 | result = hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT); |
1da177e4 LT |
373 | if (result) |
374 | return result; | |
375 | ||
40d25142 | 376 | result = attach_hdlc_protocol(dev, &proto, |
eb2a2fd9 KH |
377 | sizeof(struct cisco_state)); |
378 | if (result) | |
379 | return result; | |
1da177e4 | 380 | |
eb2a2fd9 | 381 | memcpy(&state(hdlc)->settings, &new_settings, size); |
aff26e2f | 382 | spin_lock_init(&state(hdlc)->lock); |
3b04ddde | 383 | dev->header_ops = &cisco_header_ops; |
1da177e4 | 384 | dev->type = ARPHRD_CISCO; |
c2ce9204 | 385 | netif_dormant_on(dev); |
1da177e4 LT |
386 | return 0; |
387 | } | |
388 | ||
389 | return -EINVAL; | |
390 | } | |
eb2a2fd9 KH |
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"); |