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1da177e4 LT |
1 | /* |
2 | * Generic HDLC support routines for Linux | |
3 | * | |
b3dd65f9 | 4 | * Copyright (C) 1999 - 2005 Krzysztof Halasa <khc@pm.waw.pl> |
1da177e4 LT |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of version 2 of the GNU General Public License | |
8 | * as published by the Free Software Foundation. | |
9 | * | |
10 | * Currently supported: | |
11 | * * raw IP-in-HDLC | |
12 | * * Cisco HDLC | |
13 | * * Frame Relay with ANSI or CCITT LMI (both user and network side) | |
14 | * * PPP | |
15 | * * X.25 | |
16 | * | |
17 | * Use sethdlc utility to set line parameters, protocol and PVCs | |
18 | * | |
19 | * How does it work: | |
20 | * - proto.open(), close(), start(), stop() calls are serialized. | |
21 | * The order is: open, [ start, stop ... ] close ... | |
22 | * - proto.start() and stop() are called with spin_lock_irq held. | |
23 | */ | |
24 | ||
25 | #include <linux/config.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/poll.h> | |
30 | #include <linux/errno.h> | |
31 | #include <linux/if_arp.h> | |
32 | #include <linux/init.h> | |
33 | #include <linux/skbuff.h> | |
34 | #include <linux/pkt_sched.h> | |
35 | #include <linux/inetdevice.h> | |
36 | #include <linux/lapb.h> | |
37 | #include <linux/rtnetlink.h> | |
38 | #include <linux/hdlc.h> | |
39 | ||
40 | ||
b3dd65f9 | 41 | static const char* version = "HDLC support module revision 1.18"; |
1da177e4 LT |
42 | |
43 | #undef DEBUG_LINK | |
44 | ||
45 | ||
46 | static int hdlc_change_mtu(struct net_device *dev, int new_mtu) | |
47 | { | |
48 | if ((new_mtu < 68) || (new_mtu > HDLC_MAX_MTU)) | |
49 | return -EINVAL; | |
50 | dev->mtu = new_mtu; | |
51 | return 0; | |
52 | } | |
53 | ||
54 | ||
55 | ||
56 | static struct net_device_stats *hdlc_get_stats(struct net_device *dev) | |
57 | { | |
58 | return hdlc_stats(dev); | |
59 | } | |
60 | ||
61 | ||
62 | ||
63 | static int hdlc_rcv(struct sk_buff *skb, struct net_device *dev, | |
f2ccd8fa | 64 | struct packet_type *p, struct net_device *orig_dev) |
1da177e4 LT |
65 | { |
66 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
67 | if (hdlc->proto.netif_rx) | |
68 | return hdlc->proto.netif_rx(skb); | |
69 | ||
70 | hdlc->stats.rx_dropped++; /* Shouldn't happen */ | |
71 | dev_kfree_skb(skb); | |
72 | return NET_RX_DROP; | |
73 | } | |
74 | ||
75 | ||
76 | ||
77 | static void __hdlc_set_carrier_on(struct net_device *dev) | |
78 | { | |
79 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
80 | if (hdlc->proto.start) | |
81 | return hdlc->proto.start(dev); | |
82 | #ifdef DEBUG_LINK | |
83 | if (netif_carrier_ok(dev)) | |
84 | printk(KERN_ERR "hdlc_set_carrier_on(): already on\n"); | |
85 | #endif | |
86 | netif_carrier_on(dev); | |
87 | } | |
88 | ||
89 | ||
90 | ||
91 | static void __hdlc_set_carrier_off(struct net_device *dev) | |
92 | { | |
93 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
94 | if (hdlc->proto.stop) | |
95 | return hdlc->proto.stop(dev); | |
96 | ||
97 | #ifdef DEBUG_LINK | |
98 | if (!netif_carrier_ok(dev)) | |
99 | printk(KERN_ERR "hdlc_set_carrier_off(): already off\n"); | |
100 | #endif | |
101 | netif_carrier_off(dev); | |
102 | } | |
103 | ||
104 | ||
105 | ||
106 | void hdlc_set_carrier(int on, struct net_device *dev) | |
107 | { | |
108 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
109 | unsigned long flags; | |
110 | on = on ? 1 : 0; | |
111 | ||
112 | #ifdef DEBUG_LINK | |
113 | printk(KERN_DEBUG "hdlc_set_carrier %i\n", on); | |
114 | #endif | |
115 | ||
116 | spin_lock_irqsave(&hdlc->state_lock, flags); | |
117 | ||
118 | if (hdlc->carrier == on) | |
119 | goto carrier_exit; /* no change in DCD line level */ | |
120 | ||
121 | #ifdef DEBUG_LINK | |
122 | printk(KERN_INFO "%s: carrier %s\n", dev->name, on ? "ON" : "off"); | |
123 | #endif | |
124 | hdlc->carrier = on; | |
125 | ||
126 | if (!hdlc->open) | |
127 | goto carrier_exit; | |
128 | ||
b3dd65f9 KH |
129 | if (hdlc->carrier) { |
130 | printk(KERN_INFO "%s: Carrier detected\n", dev->name); | |
1da177e4 | 131 | __hdlc_set_carrier_on(dev); |
b3dd65f9 KH |
132 | } else { |
133 | printk(KERN_INFO "%s: Carrier lost\n", dev->name); | |
1da177e4 | 134 | __hdlc_set_carrier_off(dev); |
b3dd65f9 | 135 | } |
1da177e4 LT |
136 | |
137 | carrier_exit: | |
138 | spin_unlock_irqrestore(&hdlc->state_lock, flags); | |
139 | } | |
140 | ||
141 | ||
142 | ||
143 | /* Must be called by hardware driver when HDLC device is being opened */ | |
144 | int hdlc_open(struct net_device *dev) | |
145 | { | |
146 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
147 | #ifdef DEBUG_LINK | |
148 | printk(KERN_DEBUG "hdlc_open() carrier %i open %i\n", | |
149 | hdlc->carrier, hdlc->open); | |
150 | #endif | |
151 | ||
152 | if (hdlc->proto.id == -1) | |
153 | return -ENOSYS; /* no protocol attached */ | |
154 | ||
155 | if (hdlc->proto.open) { | |
156 | int result = hdlc->proto.open(dev); | |
157 | if (result) | |
158 | return result; | |
159 | } | |
160 | ||
161 | spin_lock_irq(&hdlc->state_lock); | |
162 | ||
b3dd65f9 KH |
163 | if (hdlc->carrier) { |
164 | printk(KERN_INFO "%s: Carrier detected\n", dev->name); | |
1da177e4 | 165 | __hdlc_set_carrier_on(dev); |
b3dd65f9 KH |
166 | } else |
167 | printk(KERN_INFO "%s: No carrier\n", dev->name); | |
1da177e4 LT |
168 | |
169 | hdlc->open = 1; | |
170 | ||
171 | spin_unlock_irq(&hdlc->state_lock); | |
172 | return 0; | |
173 | } | |
174 | ||
175 | ||
176 | ||
177 | /* Must be called by hardware driver when HDLC device is being closed */ | |
178 | void hdlc_close(struct net_device *dev) | |
179 | { | |
180 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
181 | #ifdef DEBUG_LINK | |
182 | printk(KERN_DEBUG "hdlc_close() carrier %i open %i\n", | |
183 | hdlc->carrier, hdlc->open); | |
184 | #endif | |
185 | ||
186 | spin_lock_irq(&hdlc->state_lock); | |
187 | ||
188 | hdlc->open = 0; | |
189 | if (hdlc->carrier) | |
190 | __hdlc_set_carrier_off(dev); | |
191 | ||
192 | spin_unlock_irq(&hdlc->state_lock); | |
193 | ||
194 | if (hdlc->proto.close) | |
195 | hdlc->proto.close(dev); | |
196 | } | |
197 | ||
198 | ||
199 | ||
200 | #ifndef CONFIG_HDLC_RAW | |
201 | #define hdlc_raw_ioctl(dev, ifr) -ENOSYS | |
202 | #endif | |
203 | ||
204 | #ifndef CONFIG_HDLC_RAW_ETH | |
205 | #define hdlc_raw_eth_ioctl(dev, ifr) -ENOSYS | |
206 | #endif | |
207 | ||
208 | #ifndef CONFIG_HDLC_PPP | |
209 | #define hdlc_ppp_ioctl(dev, ifr) -ENOSYS | |
210 | #endif | |
211 | ||
212 | #ifndef CONFIG_HDLC_CISCO | |
213 | #define hdlc_cisco_ioctl(dev, ifr) -ENOSYS | |
214 | #endif | |
215 | ||
216 | #ifndef CONFIG_HDLC_FR | |
217 | #define hdlc_fr_ioctl(dev, ifr) -ENOSYS | |
218 | #endif | |
219 | ||
220 | #ifndef CONFIG_HDLC_X25 | |
221 | #define hdlc_x25_ioctl(dev, ifr) -ENOSYS | |
222 | #endif | |
223 | ||
224 | ||
225 | int hdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
226 | { | |
227 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
228 | unsigned int proto; | |
229 | ||
230 | if (cmd != SIOCWANDEV) | |
231 | return -EINVAL; | |
232 | ||
233 | switch(ifr->ifr_settings.type) { | |
234 | case IF_PROTO_HDLC: | |
235 | case IF_PROTO_HDLC_ETH: | |
236 | case IF_PROTO_PPP: | |
237 | case IF_PROTO_CISCO: | |
238 | case IF_PROTO_FR: | |
239 | case IF_PROTO_X25: | |
240 | proto = ifr->ifr_settings.type; | |
241 | break; | |
242 | ||
243 | default: | |
244 | proto = hdlc->proto.id; | |
245 | } | |
246 | ||
247 | switch(proto) { | |
248 | case IF_PROTO_HDLC: return hdlc_raw_ioctl(dev, ifr); | |
249 | case IF_PROTO_HDLC_ETH: return hdlc_raw_eth_ioctl(dev, ifr); | |
250 | case IF_PROTO_PPP: return hdlc_ppp_ioctl(dev, ifr); | |
251 | case IF_PROTO_CISCO: return hdlc_cisco_ioctl(dev, ifr); | |
252 | case IF_PROTO_FR: return hdlc_fr_ioctl(dev, ifr); | |
253 | case IF_PROTO_X25: return hdlc_x25_ioctl(dev, ifr); | |
254 | default: return -EINVAL; | |
255 | } | |
256 | } | |
257 | ||
258 | static void hdlc_setup(struct net_device *dev) | |
259 | { | |
260 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
261 | ||
262 | dev->get_stats = hdlc_get_stats; | |
263 | dev->change_mtu = hdlc_change_mtu; | |
264 | dev->mtu = HDLC_MAX_MTU; | |
265 | ||
266 | dev->type = ARPHRD_RAWHDLC; | |
267 | dev->hard_header_len = 16; | |
268 | ||
269 | dev->flags = IFF_POINTOPOINT | IFF_NOARP; | |
270 | ||
271 | hdlc->proto.id = -1; | |
272 | hdlc->proto.detach = NULL; | |
273 | hdlc->carrier = 1; | |
274 | hdlc->open = 0; | |
275 | spin_lock_init(&hdlc->state_lock); | |
276 | } | |
277 | ||
278 | struct net_device *alloc_hdlcdev(void *priv) | |
279 | { | |
280 | struct net_device *dev; | |
281 | dev = alloc_netdev(sizeof(hdlc_device), "hdlc%d", hdlc_setup); | |
282 | if (dev) | |
283 | dev_to_hdlc(dev)->priv = priv; | |
284 | return dev; | |
285 | } | |
286 | ||
287 | int register_hdlc_device(struct net_device *dev) | |
288 | { | |
289 | int result = dev_alloc_name(dev, "hdlc%d"); | |
290 | if (result < 0) | |
291 | return result; | |
292 | ||
293 | result = register_netdev(dev); | |
294 | if (result != 0) | |
295 | return -EIO; | |
296 | ||
297 | if (netif_carrier_ok(dev)) | |
298 | netif_carrier_off(dev); /* no carrier until DCD goes up */ | |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
303 | ||
304 | ||
305 | void unregister_hdlc_device(struct net_device *dev) | |
306 | { | |
307 | rtnl_lock(); | |
308 | hdlc_proto_detach(dev_to_hdlc(dev)); | |
309 | unregister_netdevice(dev); | |
310 | rtnl_unlock(); | |
311 | } | |
312 | ||
313 | ||
314 | ||
315 | MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); | |
316 | MODULE_DESCRIPTION("HDLC support module"); | |
317 | MODULE_LICENSE("GPL v2"); | |
318 | ||
319 | EXPORT_SYMBOL(hdlc_open); | |
320 | EXPORT_SYMBOL(hdlc_close); | |
321 | EXPORT_SYMBOL(hdlc_set_carrier); | |
322 | EXPORT_SYMBOL(hdlc_ioctl); | |
323 | EXPORT_SYMBOL(alloc_hdlcdev); | |
324 | EXPORT_SYMBOL(register_hdlc_device); | |
325 | EXPORT_SYMBOL(unregister_hdlc_device); | |
326 | ||
327 | static struct packet_type hdlc_packet_type = { | |
328 | .type = __constant_htons(ETH_P_HDLC), | |
329 | .func = hdlc_rcv, | |
330 | }; | |
331 | ||
332 | ||
333 | static int __init hdlc_module_init(void) | |
334 | { | |
335 | printk(KERN_INFO "%s\n", version); | |
336 | dev_add_pack(&hdlc_packet_type); | |
337 | return 0; | |
338 | } | |
339 | ||
340 | ||
341 | ||
342 | static void __exit hdlc_module_exit(void) | |
343 | { | |
344 | dev_remove_pack(&hdlc_packet_type); | |
345 | } | |
346 | ||
347 | ||
348 | module_init(hdlc_module_init); | |
349 | module_exit(hdlc_module_exit); |