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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 | ||
1da177e4 LT |
25 | #include <linux/module.h> |
26 | #include <linux/kernel.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/poll.h> | |
29 | #include <linux/errno.h> | |
30 | #include <linux/if_arp.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/skbuff.h> | |
33 | #include <linux/pkt_sched.h> | |
34 | #include <linux/inetdevice.h> | |
35 | #include <linux/lapb.h> | |
36 | #include <linux/rtnetlink.h> | |
37 | #include <linux/hdlc.h> | |
38 | ||
39 | ||
b3dd65f9 | 40 | static const char* version = "HDLC support module revision 1.18"; |
1da177e4 LT |
41 | |
42 | #undef DEBUG_LINK | |
43 | ||
44 | ||
45 | static int hdlc_change_mtu(struct net_device *dev, int new_mtu) | |
46 | { | |
47 | if ((new_mtu < 68) || (new_mtu > HDLC_MAX_MTU)) | |
48 | return -EINVAL; | |
49 | dev->mtu = new_mtu; | |
50 | return 0; | |
51 | } | |
52 | ||
53 | ||
54 | ||
55 | static struct net_device_stats *hdlc_get_stats(struct net_device *dev) | |
56 | { | |
57 | return hdlc_stats(dev); | |
58 | } | |
59 | ||
60 | ||
61 | ||
62 | static int hdlc_rcv(struct sk_buff *skb, struct net_device *dev, | |
f2ccd8fa | 63 | struct packet_type *p, struct net_device *orig_dev) |
1da177e4 LT |
64 | { |
65 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
66 | if (hdlc->proto.netif_rx) | |
67 | return hdlc->proto.netif_rx(skb); | |
68 | ||
69 | hdlc->stats.rx_dropped++; /* Shouldn't happen */ | |
70 | dev_kfree_skb(skb); | |
71 | return NET_RX_DROP; | |
72 | } | |
73 | ||
74 | ||
75 | ||
76 | static void __hdlc_set_carrier_on(struct net_device *dev) | |
77 | { | |
78 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
79 | if (hdlc->proto.start) | |
80 | return hdlc->proto.start(dev); | |
1f7bad72 | 81 | #if 0 |
1da177e4 LT |
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); | |
1f7bad72 | 87 | #endif |
1da177e4 LT |
88 | } |
89 | ||
90 | ||
91 | ||
92 | static void __hdlc_set_carrier_off(struct net_device *dev) | |
93 | { | |
94 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
95 | if (hdlc->proto.stop) | |
96 | return hdlc->proto.stop(dev); | |
97 | ||
1f7bad72 | 98 | #if 0 |
1da177e4 LT |
99 | #ifdef DEBUG_LINK |
100 | if (!netif_carrier_ok(dev)) | |
101 | printk(KERN_ERR "hdlc_set_carrier_off(): already off\n"); | |
102 | #endif | |
103 | netif_carrier_off(dev); | |
1f7bad72 | 104 | #endif |
1da177e4 LT |
105 | } |
106 | ||
107 | ||
108 | ||
109 | void hdlc_set_carrier(int on, struct net_device *dev) | |
110 | { | |
111 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
112 | unsigned long flags; | |
113 | on = on ? 1 : 0; | |
114 | ||
115 | #ifdef DEBUG_LINK | |
116 | printk(KERN_DEBUG "hdlc_set_carrier %i\n", on); | |
117 | #endif | |
118 | ||
119 | spin_lock_irqsave(&hdlc->state_lock, flags); | |
120 | ||
121 | if (hdlc->carrier == on) | |
122 | goto carrier_exit; /* no change in DCD line level */ | |
123 | ||
124 | #ifdef DEBUG_LINK | |
125 | printk(KERN_INFO "%s: carrier %s\n", dev->name, on ? "ON" : "off"); | |
126 | #endif | |
127 | hdlc->carrier = on; | |
128 | ||
129 | if (!hdlc->open) | |
130 | goto carrier_exit; | |
131 | ||
b3dd65f9 KH |
132 | if (hdlc->carrier) { |
133 | printk(KERN_INFO "%s: Carrier detected\n", dev->name); | |
1da177e4 | 134 | __hdlc_set_carrier_on(dev); |
b3dd65f9 KH |
135 | } else { |
136 | printk(KERN_INFO "%s: Carrier lost\n", dev->name); | |
1da177e4 | 137 | __hdlc_set_carrier_off(dev); |
b3dd65f9 | 138 | } |
1da177e4 LT |
139 | |
140 | carrier_exit: | |
141 | spin_unlock_irqrestore(&hdlc->state_lock, flags); | |
142 | } | |
143 | ||
144 | ||
145 | ||
146 | /* Must be called by hardware driver when HDLC device is being opened */ | |
147 | int hdlc_open(struct net_device *dev) | |
148 | { | |
149 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
150 | #ifdef DEBUG_LINK | |
151 | printk(KERN_DEBUG "hdlc_open() carrier %i open %i\n", | |
152 | hdlc->carrier, hdlc->open); | |
153 | #endif | |
154 | ||
155 | if (hdlc->proto.id == -1) | |
156 | return -ENOSYS; /* no protocol attached */ | |
157 | ||
158 | if (hdlc->proto.open) { | |
159 | int result = hdlc->proto.open(dev); | |
160 | if (result) | |
161 | return result; | |
162 | } | |
163 | ||
164 | spin_lock_irq(&hdlc->state_lock); | |
165 | ||
b3dd65f9 KH |
166 | if (hdlc->carrier) { |
167 | printk(KERN_INFO "%s: Carrier detected\n", dev->name); | |
1da177e4 | 168 | __hdlc_set_carrier_on(dev); |
b3dd65f9 KH |
169 | } else |
170 | printk(KERN_INFO "%s: No carrier\n", dev->name); | |
1da177e4 LT |
171 | |
172 | hdlc->open = 1; | |
173 | ||
174 | spin_unlock_irq(&hdlc->state_lock); | |
175 | return 0; | |
176 | } | |
177 | ||
178 | ||
179 | ||
180 | /* Must be called by hardware driver when HDLC device is being closed */ | |
181 | void hdlc_close(struct net_device *dev) | |
182 | { | |
183 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
184 | #ifdef DEBUG_LINK | |
185 | printk(KERN_DEBUG "hdlc_close() carrier %i open %i\n", | |
186 | hdlc->carrier, hdlc->open); | |
187 | #endif | |
188 | ||
189 | spin_lock_irq(&hdlc->state_lock); | |
190 | ||
191 | hdlc->open = 0; | |
192 | if (hdlc->carrier) | |
193 | __hdlc_set_carrier_off(dev); | |
194 | ||
195 | spin_unlock_irq(&hdlc->state_lock); | |
196 | ||
197 | if (hdlc->proto.close) | |
198 | hdlc->proto.close(dev); | |
199 | } | |
200 | ||
201 | ||
202 | ||
203 | #ifndef CONFIG_HDLC_RAW | |
204 | #define hdlc_raw_ioctl(dev, ifr) -ENOSYS | |
205 | #endif | |
206 | ||
207 | #ifndef CONFIG_HDLC_RAW_ETH | |
208 | #define hdlc_raw_eth_ioctl(dev, ifr) -ENOSYS | |
209 | #endif | |
210 | ||
211 | #ifndef CONFIG_HDLC_PPP | |
212 | #define hdlc_ppp_ioctl(dev, ifr) -ENOSYS | |
213 | #endif | |
214 | ||
215 | #ifndef CONFIG_HDLC_CISCO | |
216 | #define hdlc_cisco_ioctl(dev, ifr) -ENOSYS | |
217 | #endif | |
218 | ||
219 | #ifndef CONFIG_HDLC_FR | |
220 | #define hdlc_fr_ioctl(dev, ifr) -ENOSYS | |
221 | #endif | |
222 | ||
223 | #ifndef CONFIG_HDLC_X25 | |
224 | #define hdlc_x25_ioctl(dev, ifr) -ENOSYS | |
225 | #endif | |
226 | ||
227 | ||
228 | int hdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
229 | { | |
230 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
231 | unsigned int proto; | |
232 | ||
233 | if (cmd != SIOCWANDEV) | |
234 | return -EINVAL; | |
235 | ||
236 | switch(ifr->ifr_settings.type) { | |
237 | case IF_PROTO_HDLC: | |
238 | case IF_PROTO_HDLC_ETH: | |
239 | case IF_PROTO_PPP: | |
240 | case IF_PROTO_CISCO: | |
241 | case IF_PROTO_FR: | |
242 | case IF_PROTO_X25: | |
243 | proto = ifr->ifr_settings.type; | |
244 | break; | |
245 | ||
246 | default: | |
247 | proto = hdlc->proto.id; | |
248 | } | |
249 | ||
250 | switch(proto) { | |
251 | case IF_PROTO_HDLC: return hdlc_raw_ioctl(dev, ifr); | |
252 | case IF_PROTO_HDLC_ETH: return hdlc_raw_eth_ioctl(dev, ifr); | |
253 | case IF_PROTO_PPP: return hdlc_ppp_ioctl(dev, ifr); | |
254 | case IF_PROTO_CISCO: return hdlc_cisco_ioctl(dev, ifr); | |
255 | case IF_PROTO_FR: return hdlc_fr_ioctl(dev, ifr); | |
256 | case IF_PROTO_X25: return hdlc_x25_ioctl(dev, ifr); | |
257 | default: return -EINVAL; | |
258 | } | |
259 | } | |
260 | ||
4a31e348 | 261 | void hdlc_setup(struct net_device *dev) |
1da177e4 LT |
262 | { |
263 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
264 | ||
265 | dev->get_stats = hdlc_get_stats; | |
266 | dev->change_mtu = hdlc_change_mtu; | |
267 | dev->mtu = HDLC_MAX_MTU; | |
268 | ||
269 | dev->type = ARPHRD_RAWHDLC; | |
270 | dev->hard_header_len = 16; | |
271 | ||
272 | dev->flags = IFF_POINTOPOINT | IFF_NOARP; | |
273 | ||
274 | hdlc->proto.id = -1; | |
275 | hdlc->proto.detach = NULL; | |
276 | hdlc->carrier = 1; | |
277 | hdlc->open = 0; | |
278 | spin_lock_init(&hdlc->state_lock); | |
279 | } | |
280 | ||
281 | struct net_device *alloc_hdlcdev(void *priv) | |
282 | { | |
283 | struct net_device *dev; | |
284 | dev = alloc_netdev(sizeof(hdlc_device), "hdlc%d", hdlc_setup); | |
285 | if (dev) | |
286 | dev_to_hdlc(dev)->priv = priv; | |
287 | return dev; | |
288 | } | |
289 | ||
1da177e4 LT |
290 | void unregister_hdlc_device(struct net_device *dev) |
291 | { | |
292 | rtnl_lock(); | |
293 | hdlc_proto_detach(dev_to_hdlc(dev)); | |
294 | unregister_netdevice(dev); | |
295 | rtnl_unlock(); | |
296 | } | |
297 | ||
298 | ||
299 | ||
300 | MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); | |
301 | MODULE_DESCRIPTION("HDLC support module"); | |
302 | MODULE_LICENSE("GPL v2"); | |
303 | ||
304 | EXPORT_SYMBOL(hdlc_open); | |
305 | EXPORT_SYMBOL(hdlc_close); | |
306 | EXPORT_SYMBOL(hdlc_set_carrier); | |
307 | EXPORT_SYMBOL(hdlc_ioctl); | |
4a31e348 | 308 | EXPORT_SYMBOL(hdlc_setup); |
1da177e4 | 309 | EXPORT_SYMBOL(alloc_hdlcdev); |
1da177e4 LT |
310 | EXPORT_SYMBOL(unregister_hdlc_device); |
311 | ||
312 | static struct packet_type hdlc_packet_type = { | |
313 | .type = __constant_htons(ETH_P_HDLC), | |
314 | .func = hdlc_rcv, | |
315 | }; | |
316 | ||
317 | ||
318 | static int __init hdlc_module_init(void) | |
319 | { | |
320 | printk(KERN_INFO "%s\n", version); | |
321 | dev_add_pack(&hdlc_packet_type); | |
322 | return 0; | |
323 | } | |
324 | ||
325 | ||
326 | ||
327 | static void __exit hdlc_module_exit(void) | |
328 | { | |
329 | dev_remove_pack(&hdlc_packet_type); | |
330 | } | |
331 | ||
332 | ||
333 | module_init(hdlc_module_init); | |
334 | module_exit(hdlc_module_exit); |