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1/*
2 * "LAPB via ethernet" driver release 001
3 *
4 * This code REQUIRES 2.1.15 or higher/ NET3.038
5 *
6 * This module:
7 * This module is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 *
12 * This is a "pseudo" network driver to allow LAPB over Ethernet.
13 *
14 * This driver can use any ethernet destination address, and can be
15 * limited to accept frames from one dedicated ethernet card only.
16 *
17 * History
18 * LAPBETH 001 Jonathan Naylor Cloned from bpqether.c
19 * 2000-10-29 Henner Eisen lapb_data_indication() return status.
20 * 2000-11-14 Henner Eisen dev_hold/put, NETDEV_GOING_DOWN support
21 */
22
23#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
25#include <linux/errno.h>
26#include <linux/types.h>
27#include <linux/socket.h>
28#include <linux/in.h>
29#include <linux/slab.h>
30#include <linux/kernel.h>
31#include <linux/string.h>
32#include <linux/net.h>
33#include <linux/inet.h>
34#include <linux/netdevice.h>
35#include <linux/if_arp.h>
36#include <linux/skbuff.h>
37#include <net/sock.h>
38#include <linux/uaccess.h>
39#include <linux/mm.h>
40#include <linux/interrupt.h>
41#include <linux/notifier.h>
42#include <linux/stat.h>
43#include <linux/module.h>
44#include <linux/lapb.h>
45#include <linux/init.h>
46
47#include <net/x25device.h>
48
49static const u8 bcast_addr[6] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
50
51/* If this number is made larger, check that the temporary string buffer
52 * in lapbeth_new_device is large enough to store the probe device name.*/
53#define MAXLAPBDEV 100
54
55struct lapbethdev {
56 struct list_head node;
57 struct net_device *ethdev; /* link to ethernet device */
58 struct net_device *axdev; /* lapbeth device (lapb#) */
59};
60
61static LIST_HEAD(lapbeth_devices);
62
63/* ------------------------------------------------------------------------ */
64
65/*
66 * Get the LAPB device for the ethernet device
67 */
68static struct lapbethdev *lapbeth_get_x25_dev(struct net_device *dev)
69{
70 struct lapbethdev *lapbeth;
71
72 list_for_each_entry_rcu(lapbeth, &lapbeth_devices, node) {
73 if (lapbeth->ethdev == dev)
74 return lapbeth;
75 }
76 return NULL;
77}
78
79static __inline__ int dev_is_ethdev(struct net_device *dev)
80{
81 return dev->type == ARPHRD_ETHER && strncmp(dev->name, "dummy", 5);
82}
83
84/* ------------------------------------------------------------------------ */
85
86/*
87 * Receive a LAPB frame via an ethernet interface.
88 */
89static int lapbeth_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *ptype, struct net_device *orig_dev)
90{
91 int len, err;
92 struct lapbethdev *lapbeth;
93
94 if (dev_net(dev) != &init_net)
95 goto drop;
96
97 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
98 return NET_RX_DROP;
99
100 if (!pskb_may_pull(skb, 2))
101 goto drop;
102
103 rcu_read_lock();
104 lapbeth = lapbeth_get_x25_dev(dev);
105 if (!lapbeth)
106 goto drop_unlock;
107 if (!netif_running(lapbeth->axdev))
108 goto drop_unlock;
109
110 len = skb->data[0] + skb->data[1] * 256;
111 dev->stats.rx_packets++;
112 dev->stats.rx_bytes += len;
113
114 skb_pull(skb, 2); /* Remove the length bytes */
115 skb_trim(skb, len); /* Set the length of the data */
116
117 if ((err = lapb_data_received(lapbeth->axdev, skb)) != LAPB_OK) {
118 printk(KERN_DEBUG "lapbether: lapb_data_received err - %d\n", err);
119 goto drop_unlock;
120 }
121out:
122 rcu_read_unlock();
123 return 0;
124drop_unlock:
125 kfree_skb(skb);
126 goto out;
127drop:
128 kfree_skb(skb);
129 return 0;
130}
131
132static int lapbeth_data_indication(struct net_device *dev, struct sk_buff *skb)
133{
134 unsigned char *ptr;
135
136 skb_push(skb, 1);
137
138 if (skb_cow(skb, 1))
139 return NET_RX_DROP;
140
141 ptr = skb->data;
142 *ptr = X25_IFACE_DATA;
143
144 skb->protocol = x25_type_trans(skb, dev);
145 return netif_rx(skb);
146}
147
148/*
149 * Send a LAPB frame via an ethernet interface
150 */
151static netdev_tx_t lapbeth_xmit(struct sk_buff *skb,
152 struct net_device *dev)
153{
154 int err;
155
156 /*
157 * Just to be *really* sure not to send anything if the interface
158 * is down, the ethernet device may have gone.
159 */
160 if (!netif_running(dev))
161 goto drop;
162
163 switch (skb->data[0]) {
164 case X25_IFACE_DATA:
165 break;
166 case X25_IFACE_CONNECT:
167 if ((err = lapb_connect_request(dev)) != LAPB_OK)
168 pr_err("lapb_connect_request error: %d\n", err);
169 goto drop;
170 case X25_IFACE_DISCONNECT:
171 if ((err = lapb_disconnect_request(dev)) != LAPB_OK)
172 pr_err("lapb_disconnect_request err: %d\n", err);
173 /* Fall thru */
174 default:
175 goto drop;
176 }
177
178 skb_pull(skb, 1);
179
180 if ((err = lapb_data_request(dev, skb)) != LAPB_OK) {
181 pr_err("lapb_data_request error - %d\n", err);
182 goto drop;
183 }
184out:
185 return NETDEV_TX_OK;
186drop:
187 kfree_skb(skb);
188 goto out;
189}
190
191static void lapbeth_data_transmit(struct net_device *ndev, struct sk_buff *skb)
192{
193 struct lapbethdev *lapbeth = netdev_priv(ndev);
194 unsigned char *ptr;
195 struct net_device *dev;
196 int size = skb->len;
197
198 skb->protocol = htons(ETH_P_X25);
199
200 ptr = skb_push(skb, 2);
201
202 *ptr++ = size % 256;
203 *ptr++ = size / 256;
204
205 ndev->stats.tx_packets++;
206 ndev->stats.tx_bytes += size;
207
208 skb->dev = dev = lapbeth->ethdev;
209
210 dev_hard_header(skb, dev, ETH_P_DEC, bcast_addr, NULL, 0);
211
212 dev_queue_xmit(skb);
213}
214
215static void lapbeth_connected(struct net_device *dev, int reason)
216{
217 unsigned char *ptr;
218 struct sk_buff *skb = dev_alloc_skb(1);
219
220 if (!skb) {
221 pr_err("out of memory\n");
222 return;
223 }
224
225 ptr = skb_put(skb, 1);
226 *ptr = X25_IFACE_CONNECT;
227
228 skb->protocol = x25_type_trans(skb, dev);
229 netif_rx(skb);
230}
231
232static void lapbeth_disconnected(struct net_device *dev, int reason)
233{
234 unsigned char *ptr;
235 struct sk_buff *skb = dev_alloc_skb(1);
236
237 if (!skb) {
238 pr_err("out of memory\n");
239 return;
240 }
241
242 ptr = skb_put(skb, 1);
243 *ptr = X25_IFACE_DISCONNECT;
244
245 skb->protocol = x25_type_trans(skb, dev);
246 netif_rx(skb);
247}
248
249/*
250 * Set AX.25 callsign
251 */
252static int lapbeth_set_mac_address(struct net_device *dev, void *addr)
253{
254 struct sockaddr *sa = addr;
255 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
256 return 0;
257}
258
259
260static const struct lapb_register_struct lapbeth_callbacks = {
261 .connect_confirmation = lapbeth_connected,
262 .connect_indication = lapbeth_connected,
263 .disconnect_confirmation = lapbeth_disconnected,
264 .disconnect_indication = lapbeth_disconnected,
265 .data_indication = lapbeth_data_indication,
266 .data_transmit = lapbeth_data_transmit,
267};
268
269/*
270 * open/close a device
271 */
272static int lapbeth_open(struct net_device *dev)
273{
274 int err;
275
276 if ((err = lapb_register(dev, &lapbeth_callbacks)) != LAPB_OK) {
277 pr_err("lapb_register error: %d\n", err);
278 return -ENODEV;
279 }
280
281 netif_start_queue(dev);
282 return 0;
283}
284
285static int lapbeth_close(struct net_device *dev)
286{
287 int err;
288
289 netif_stop_queue(dev);
290
291 if ((err = lapb_unregister(dev)) != LAPB_OK)
292 pr_err("lapb_unregister error: %d\n", err);
293
294 return 0;
295}
296
297/* ------------------------------------------------------------------------ */
298
299static const struct net_device_ops lapbeth_netdev_ops = {
300 .ndo_open = lapbeth_open,
301 .ndo_stop = lapbeth_close,
302 .ndo_start_xmit = lapbeth_xmit,
303 .ndo_set_mac_address = lapbeth_set_mac_address,
304};
305
306static void lapbeth_setup(struct net_device *dev)
307{
308 dev->netdev_ops = &lapbeth_netdev_ops;
309 dev->destructor = free_netdev;
310 dev->type = ARPHRD_X25;
311 dev->hard_header_len = 3;
312 dev->mtu = 1000;
313 dev->addr_len = 0;
314}
315
316/*
317 * Setup a new device.
318 */
319static int lapbeth_new_device(struct net_device *dev)
320{
321 struct net_device *ndev;
322 struct lapbethdev *lapbeth;
323 int rc = -ENOMEM;
324
325 ASSERT_RTNL();
326
327 ndev = alloc_netdev(sizeof(*lapbeth), "lapb%d", NET_NAME_UNKNOWN,
328 lapbeth_setup);
329 if (!ndev)
330 goto out;
331
332 lapbeth = netdev_priv(ndev);
333 lapbeth->axdev = ndev;
334
335 dev_hold(dev);
336 lapbeth->ethdev = dev;
337
338 rc = -EIO;
339 if (register_netdevice(ndev))
340 goto fail;
341
342 list_add_rcu(&lapbeth->node, &lapbeth_devices);
343 rc = 0;
344out:
345 return rc;
346fail:
347 dev_put(dev);
348 free_netdev(ndev);
349 kfree(lapbeth);
350 goto out;
351}
352
353/*
354 * Free a lapb network device.
355 */
356static void lapbeth_free_device(struct lapbethdev *lapbeth)
357{
358 dev_put(lapbeth->ethdev);
359 list_del_rcu(&lapbeth->node);
360 unregister_netdevice(lapbeth->axdev);
361}
362
363/*
364 * Handle device status changes.
365 *
366 * Called from notifier with RTNL held.
367 */
368static int lapbeth_device_event(struct notifier_block *this,
369 unsigned long event, void *ptr)
370{
371 struct lapbethdev *lapbeth;
372 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
373
374 if (dev_net(dev) != &init_net)
375 return NOTIFY_DONE;
376
377 if (!dev_is_ethdev(dev))
378 return NOTIFY_DONE;
379
380 switch (event) {
381 case NETDEV_UP:
382 /* New ethernet device -> new LAPB interface */
383 if (lapbeth_get_x25_dev(dev) == NULL)
384 lapbeth_new_device(dev);
385 break;
386 case NETDEV_DOWN:
387 /* ethernet device closed -> close LAPB interface */
388 lapbeth = lapbeth_get_x25_dev(dev);
389 if (lapbeth)
390 dev_close(lapbeth->axdev);
391 break;
392 case NETDEV_UNREGISTER:
393 /* ethernet device disappears -> remove LAPB interface */
394 lapbeth = lapbeth_get_x25_dev(dev);
395 if (lapbeth)
396 lapbeth_free_device(lapbeth);
397 break;
398 }
399
400 return NOTIFY_DONE;
401}
402
403/* ------------------------------------------------------------------------ */
404
405static struct packet_type lapbeth_packet_type __read_mostly = {
406 .type = cpu_to_be16(ETH_P_DEC),
407 .func = lapbeth_rcv,
408};
409
410static struct notifier_block lapbeth_dev_notifier = {
411 .notifier_call = lapbeth_device_event,
412};
413
414static const char banner[] __initconst =
415 KERN_INFO "LAPB Ethernet driver version 0.02\n";
416
417static int __init lapbeth_init_driver(void)
418{
419 dev_add_pack(&lapbeth_packet_type);
420
421 register_netdevice_notifier(&lapbeth_dev_notifier);
422
423 printk(banner);
424
425 return 0;
426}
427module_init(lapbeth_init_driver);
428
429static void __exit lapbeth_cleanup_driver(void)
430{
431 struct lapbethdev *lapbeth;
432 struct list_head *entry, *tmp;
433
434 dev_remove_pack(&lapbeth_packet_type);
435 unregister_netdevice_notifier(&lapbeth_dev_notifier);
436
437 rtnl_lock();
438 list_for_each_safe(entry, tmp, &lapbeth_devices) {
439 lapbeth = list_entry(entry, struct lapbethdev, node);
440
441 dev_put(lapbeth->ethdev);
442 unregister_netdevice(lapbeth->axdev);
443 }
444 rtnl_unlock();
445}
446module_exit(lapbeth_cleanup_driver);
447
448MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
449MODULE_DESCRIPTION("The unofficial LAPB over Ethernet driver");
450MODULE_LICENSE("GPL");
1/*
2 * "LAPB via ethernet" driver release 001
3 *
4 * This code REQUIRES 2.1.15 or higher/ NET3.038
5 *
6 * This module:
7 * This module is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 *
12 * This is a "pseudo" network driver to allow LAPB over Ethernet.
13 *
14 * This driver can use any ethernet destination address, and can be
15 * limited to accept frames from one dedicated ethernet card only.
16 *
17 * History
18 * LAPBETH 001 Jonathan Naylor Cloned from bpqether.c
19 * 2000-10-29 Henner Eisen lapb_data_indication() return status.
20 * 2000-11-14 Henner Eisen dev_hold/put, NETDEV_GOING_DOWN support
21 */
22
23#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
25#include <linux/errno.h>
26#include <linux/types.h>
27#include <linux/socket.h>
28#include <linux/in.h>
29#include <linux/slab.h>
30#include <linux/kernel.h>
31#include <linux/string.h>
32#include <linux/net.h>
33#include <linux/inet.h>
34#include <linux/netdevice.h>
35#include <linux/if_arp.h>
36#include <linux/skbuff.h>
37#include <net/sock.h>
38#include <asm/system.h>
39#include <asm/uaccess.h>
40#include <linux/mm.h>
41#include <linux/interrupt.h>
42#include <linux/notifier.h>
43#include <linux/stat.h>
44#include <linux/netfilter.h>
45#include <linux/module.h>
46#include <linux/lapb.h>
47#include <linux/init.h>
48
49#include <net/x25device.h>
50
51static const u8 bcast_addr[6] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
52
53/* If this number is made larger, check that the temporary string buffer
54 * in lapbeth_new_device is large enough to store the probe device name.*/
55#define MAXLAPBDEV 100
56
57struct lapbethdev {
58 struct list_head node;
59 struct net_device *ethdev; /* link to ethernet device */
60 struct net_device *axdev; /* lapbeth device (lapb#) */
61};
62
63static LIST_HEAD(lapbeth_devices);
64
65/* ------------------------------------------------------------------------ */
66
67/*
68 * Get the LAPB device for the ethernet device
69 */
70static struct lapbethdev *lapbeth_get_x25_dev(struct net_device *dev)
71{
72 struct lapbethdev *lapbeth;
73
74 list_for_each_entry_rcu(lapbeth, &lapbeth_devices, node) {
75 if (lapbeth->ethdev == dev)
76 return lapbeth;
77 }
78 return NULL;
79}
80
81static __inline__ int dev_is_ethdev(struct net_device *dev)
82{
83 return dev->type == ARPHRD_ETHER && strncmp(dev->name, "dummy", 5);
84}
85
86/* ------------------------------------------------------------------------ */
87
88/*
89 * Receive a LAPB frame via an ethernet interface.
90 */
91static int lapbeth_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *ptype, struct net_device *orig_dev)
92{
93 int len, err;
94 struct lapbethdev *lapbeth;
95
96 if (dev_net(dev) != &init_net)
97 goto drop;
98
99 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
100 return NET_RX_DROP;
101
102 if (!pskb_may_pull(skb, 2))
103 goto drop;
104
105 rcu_read_lock();
106 lapbeth = lapbeth_get_x25_dev(dev);
107 if (!lapbeth)
108 goto drop_unlock;
109 if (!netif_running(lapbeth->axdev))
110 goto drop_unlock;
111
112 len = skb->data[0] + skb->data[1] * 256;
113 dev->stats.rx_packets++;
114 dev->stats.rx_bytes += len;
115
116 skb_pull(skb, 2); /* Remove the length bytes */
117 skb_trim(skb, len); /* Set the length of the data */
118
119 if ((err = lapb_data_received(lapbeth->axdev, skb)) != LAPB_OK) {
120 printk(KERN_DEBUG "lapbether: lapb_data_received err - %d\n", err);
121 goto drop_unlock;
122 }
123out:
124 rcu_read_unlock();
125 return 0;
126drop_unlock:
127 kfree_skb(skb);
128 goto out;
129drop:
130 kfree_skb(skb);
131 return 0;
132}
133
134static int lapbeth_data_indication(struct net_device *dev, struct sk_buff *skb)
135{
136 unsigned char *ptr;
137
138 skb_push(skb, 1);
139
140 if (skb_cow(skb, 1))
141 return NET_RX_DROP;
142
143 ptr = skb->data;
144 *ptr = X25_IFACE_DATA;
145
146 skb->protocol = x25_type_trans(skb, dev);
147 return netif_rx(skb);
148}
149
150/*
151 * Send a LAPB frame via an ethernet interface
152 */
153static netdev_tx_t lapbeth_xmit(struct sk_buff *skb,
154 struct net_device *dev)
155{
156 int err;
157
158 /*
159 * Just to be *really* sure not to send anything if the interface
160 * is down, the ethernet device may have gone.
161 */
162 if (!netif_running(dev))
163 goto drop;
164
165 switch (skb->data[0]) {
166 case X25_IFACE_DATA:
167 break;
168 case X25_IFACE_CONNECT:
169 if ((err = lapb_connect_request(dev)) != LAPB_OK)
170 pr_err("lapb_connect_request error: %d\n", err);
171 goto drop;
172 case X25_IFACE_DISCONNECT:
173 if ((err = lapb_disconnect_request(dev)) != LAPB_OK)
174 pr_err("lapb_disconnect_request err: %d\n", err);
175 /* Fall thru */
176 default:
177 goto drop;
178 }
179
180 skb_pull(skb, 1);
181
182 if ((err = lapb_data_request(dev, skb)) != LAPB_OK) {
183 pr_err("lapb_data_request error - %d\n", err);
184 goto drop;
185 }
186out:
187 return NETDEV_TX_OK;
188drop:
189 kfree_skb(skb);
190 goto out;
191}
192
193static void lapbeth_data_transmit(struct net_device *ndev, struct sk_buff *skb)
194{
195 struct lapbethdev *lapbeth = netdev_priv(ndev);
196 unsigned char *ptr;
197 struct net_device *dev;
198 int size = skb->len;
199
200 skb->protocol = htons(ETH_P_X25);
201
202 ptr = skb_push(skb, 2);
203
204 *ptr++ = size % 256;
205 *ptr++ = size / 256;
206
207 ndev->stats.tx_packets++;
208 ndev->stats.tx_bytes += size;
209
210 skb->dev = dev = lapbeth->ethdev;
211
212 dev_hard_header(skb, dev, ETH_P_DEC, bcast_addr, NULL, 0);
213
214 dev_queue_xmit(skb);
215}
216
217static void lapbeth_connected(struct net_device *dev, int reason)
218{
219 unsigned char *ptr;
220 struct sk_buff *skb = dev_alloc_skb(1);
221
222 if (!skb) {
223 pr_err("out of memory\n");
224 return;
225 }
226
227 ptr = skb_put(skb, 1);
228 *ptr = X25_IFACE_CONNECT;
229
230 skb->protocol = x25_type_trans(skb, dev);
231 netif_rx(skb);
232}
233
234static void lapbeth_disconnected(struct net_device *dev, int reason)
235{
236 unsigned char *ptr;
237 struct sk_buff *skb = dev_alloc_skb(1);
238
239 if (!skb) {
240 pr_err("out of memory\n");
241 return;
242 }
243
244 ptr = skb_put(skb, 1);
245 *ptr = X25_IFACE_DISCONNECT;
246
247 skb->protocol = x25_type_trans(skb, dev);
248 netif_rx(skb);
249}
250
251/*
252 * Set AX.25 callsign
253 */
254static int lapbeth_set_mac_address(struct net_device *dev, void *addr)
255{
256 struct sockaddr *sa = addr;
257 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
258 return 0;
259}
260
261
262static struct lapb_register_struct lapbeth_callbacks = {
263 .connect_confirmation = lapbeth_connected,
264 .connect_indication = lapbeth_connected,
265 .disconnect_confirmation = lapbeth_disconnected,
266 .disconnect_indication = lapbeth_disconnected,
267 .data_indication = lapbeth_data_indication,
268 .data_transmit = lapbeth_data_transmit,
269
270};
271
272/*
273 * open/close a device
274 */
275static int lapbeth_open(struct net_device *dev)
276{
277 int err;
278
279 if ((err = lapb_register(dev, &lapbeth_callbacks)) != LAPB_OK) {
280 pr_err("lapb_register error: %d\n", err);
281 return -ENODEV;
282 }
283
284 netif_start_queue(dev);
285 return 0;
286}
287
288static int lapbeth_close(struct net_device *dev)
289{
290 int err;
291
292 netif_stop_queue(dev);
293
294 if ((err = lapb_unregister(dev)) != LAPB_OK)
295 pr_err("lapb_unregister error: %d\n", err);
296
297 return 0;
298}
299
300/* ------------------------------------------------------------------------ */
301
302static const struct net_device_ops lapbeth_netdev_ops = {
303 .ndo_open = lapbeth_open,
304 .ndo_stop = lapbeth_close,
305 .ndo_start_xmit = lapbeth_xmit,
306 .ndo_set_mac_address = lapbeth_set_mac_address,
307};
308
309static void lapbeth_setup(struct net_device *dev)
310{
311 dev->netdev_ops = &lapbeth_netdev_ops;
312 dev->destructor = free_netdev;
313 dev->type = ARPHRD_X25;
314 dev->hard_header_len = 3;
315 dev->mtu = 1000;
316 dev->addr_len = 0;
317}
318
319/*
320 * Setup a new device.
321 */
322static int lapbeth_new_device(struct net_device *dev)
323{
324 struct net_device *ndev;
325 struct lapbethdev *lapbeth;
326 int rc = -ENOMEM;
327
328 ASSERT_RTNL();
329
330 ndev = alloc_netdev(sizeof(*lapbeth), "lapb%d",
331 lapbeth_setup);
332 if (!ndev)
333 goto out;
334
335 lapbeth = netdev_priv(ndev);
336 lapbeth->axdev = ndev;
337
338 dev_hold(dev);
339 lapbeth->ethdev = dev;
340
341 rc = -EIO;
342 if (register_netdevice(ndev))
343 goto fail;
344
345 list_add_rcu(&lapbeth->node, &lapbeth_devices);
346 rc = 0;
347out:
348 return rc;
349fail:
350 dev_put(dev);
351 free_netdev(ndev);
352 kfree(lapbeth);
353 goto out;
354}
355
356/*
357 * Free a lapb network device.
358 */
359static void lapbeth_free_device(struct lapbethdev *lapbeth)
360{
361 dev_put(lapbeth->ethdev);
362 list_del_rcu(&lapbeth->node);
363 unregister_netdevice(lapbeth->axdev);
364}
365
366/*
367 * Handle device status changes.
368 *
369 * Called from notifier with RTNL held.
370 */
371static int lapbeth_device_event(struct notifier_block *this,
372 unsigned long event, void *ptr)
373{
374 struct lapbethdev *lapbeth;
375 struct net_device *dev = ptr;
376
377 if (dev_net(dev) != &init_net)
378 return NOTIFY_DONE;
379
380 if (!dev_is_ethdev(dev))
381 return NOTIFY_DONE;
382
383 switch (event) {
384 case NETDEV_UP:
385 /* New ethernet device -> new LAPB interface */
386 if (lapbeth_get_x25_dev(dev) == NULL)
387 lapbeth_new_device(dev);
388 break;
389 case NETDEV_DOWN:
390 /* ethernet device closed -> close LAPB interface */
391 lapbeth = lapbeth_get_x25_dev(dev);
392 if (lapbeth)
393 dev_close(lapbeth->axdev);
394 break;
395 case NETDEV_UNREGISTER:
396 /* ethernet device disappears -> remove LAPB interface */
397 lapbeth = lapbeth_get_x25_dev(dev);
398 if (lapbeth)
399 lapbeth_free_device(lapbeth);
400 break;
401 }
402
403 return NOTIFY_DONE;
404}
405
406/* ------------------------------------------------------------------------ */
407
408static struct packet_type lapbeth_packet_type __read_mostly = {
409 .type = cpu_to_be16(ETH_P_DEC),
410 .func = lapbeth_rcv,
411};
412
413static struct notifier_block lapbeth_dev_notifier = {
414 .notifier_call = lapbeth_device_event,
415};
416
417static const char banner[] __initconst =
418 KERN_INFO "LAPB Ethernet driver version 0.02\n";
419
420static int __init lapbeth_init_driver(void)
421{
422 dev_add_pack(&lapbeth_packet_type);
423
424 register_netdevice_notifier(&lapbeth_dev_notifier);
425
426 printk(banner);
427
428 return 0;
429}
430module_init(lapbeth_init_driver);
431
432static void __exit lapbeth_cleanup_driver(void)
433{
434 struct lapbethdev *lapbeth;
435 struct list_head *entry, *tmp;
436
437 dev_remove_pack(&lapbeth_packet_type);
438 unregister_netdevice_notifier(&lapbeth_dev_notifier);
439
440 rtnl_lock();
441 list_for_each_safe(entry, tmp, &lapbeth_devices) {
442 lapbeth = list_entry(entry, struct lapbethdev, node);
443
444 dev_put(lapbeth->ethdev);
445 unregister_netdevice(lapbeth->axdev);
446 }
447 rtnl_unlock();
448}
449module_exit(lapbeth_cleanup_driver);
450
451MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
452MODULE_DESCRIPTION("The unofficial LAPB over Ethernet driver");
453MODULE_LICENSE("GPL");