blob: 14f01d156db9cf588a7640de77998cbba65a3c75 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * G8BPQ compatible "AX.25 via ethernet" driver release 004
3 *
4 * This code REQUIRES 2.0.0 or higher/ NET3.029
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 AX.25 over Ethernet
13 * using G8BPQ encapsulation. It has been extracted from the protocol
14 * implementation because
15 *
16 * - things got unreadable within the protocol stack
17 * - to cure the protocol stack from "feature-ism"
18 * - a protocol implementation shouldn't need to know on
19 * which hardware it is running
20 * - user-level programs like the AX.25 utilities shouldn't
21 * need to know about the hardware.
22 * - IP over ethernet encapsulated AX.25 was impossible
23 * - rxecho.c did not work
24 * - to have room for extensions
25 * - it just deserves to "live" as an own driver
26 *
27 * This driver can use any ethernet destination address, and can be
28 * limited to accept frames from one dedicated ethernet card only.
29 *
30 * Note that the driver sets up the BPQ devices automagically on
31 * startup or (if started before the "insmod" of an ethernet device)
32 * on "ifconfig up". It hopefully will remove the BPQ on "rmmod"ing
33 * the ethernet device (in fact: as soon as another ethernet or bpq
34 * device gets "ifconfig"ured).
35 *
36 * I have heard that several people are thinking of experiments
37 * with highspeed packet radio using existing ethernet cards.
38 * Well, this driver is prepared for this purpose, just add
39 * your tx key control and a txdelay / tailtime algorithm,
40 * probably some buffering, and /voila/...
41 *
42 * History
43 * BPQ 001 Joerg(DL1BKE) Extracted BPQ code from AX.25
44 * protocol stack and added my own
45 * yet existing patches
46 * BPQ 002 Joerg(DL1BKE) Scan network device list on
47 * startup.
48 * BPQ 003 Joerg(DL1BKE) Ethernet destination address
49 * and accepted source address
50 * can be configured by an ioctl()
51 * call.
52 * Fixed to match Linux networking
53 * changes - 2.1.15.
54 * BPQ 004 Joerg(DL1BKE) Fixed to not lock up on ifconfig.
55 */
56
Linus Torvalds1da177e2005-04-16 15:20:36 -070057#include <linux/errno.h>
58#include <linux/types.h>
59#include <linux/socket.h>
60#include <linux/in.h>
61#include <linux/kernel.h>
62#include <linux/string.h>
63#include <linux/net.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090064#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070065#include <net/ax25.h>
66#include <linux/inet.h>
67#include <linux/netdevice.h>
Joe Perches0795af52007-10-03 17:59:30 -070068#include <linux/etherdevice.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070069#include <linux/if_arp.h>
70#include <linux/skbuff.h>
71#include <net/sock.h>
72#include <asm/system.h>
73#include <asm/uaccess.h>
74#include <linux/mm.h>
75#include <linux/interrupt.h>
76#include <linux/notifier.h>
77#include <linux/proc_fs.h>
78#include <linux/seq_file.h>
79#include <linux/stat.h>
80#include <linux/netfilter.h>
81#include <linux/module.h>
82#include <linux/init.h>
83#include <linux/rtnetlink.h>
84
85#include <net/ip.h>
86#include <net/arp.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020087#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
89#include <linux/bpqether.h>
90
Hannes Edereb33ae22009-02-14 11:33:21 +000091static const char banner[] __initdata = KERN_INFO \
92 "AX.25: bpqether driver version 004\n";
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
Linus Torvalds1da177e2005-04-16 15:20:36 -070094static char bcast_addr[6]={0xFF,0xFF,0xFF,0xFF,0xFF,0xFF};
95
96static char bpq_eth_addr[6];
97
David S. Millerf2ccd8f2005-08-09 19:34:12 -070098static int bpq_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099static int bpq_device_event(struct notifier_block *, unsigned long, void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
Stephen Hemminger7546dd92009-03-09 08:18:29 +0000101static struct packet_type bpq_packet_type __read_mostly = {
Harvey Harrison09640e62009-02-01 00:45:17 -0800102 .type = cpu_to_be16(ETH_P_BPQ),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 .func = bpq_rcv,
104};
105
106static struct notifier_block bpq_dev_notifier = {
107 .notifier_call =bpq_device_event,
108};
109
110
111struct bpqdev {
112 struct list_head bpq_list; /* list of bpq devices chain */
113 struct net_device *ethdev; /* link to ethernet device */
114 struct net_device *axdev; /* bpq device (bpq#) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 char dest_addr[6]; /* ether destination address */
116 char acpt_addr[6]; /* accept ether frames from this address only */
117};
118
119static LIST_HEAD(bpq_devices);
120
Ralf Baechle1eeb7e42006-07-10 11:24:46 -0700121/*
122 * bpqether network devices are paired with ethernet devices below them, so
123 * form a special "super class" of normal ethernet devices; split their locks
124 * off into a separate class since they always nest.
125 */
126static struct lock_class_key bpq_netdev_xmit_lock_key;
David S. Millercf508b12008-07-22 14:16:42 -0700127static struct lock_class_key bpq_netdev_addr_lock_key;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
David S. Millere8a04642008-07-17 00:34:19 -0700129static void bpq_set_lockdep_class_one(struct net_device *dev,
130 struct netdev_queue *txq,
131 void *_unused)
David S. Millerc773e842008-07-08 23:13:53 -0700132{
133 lockdep_set_class(&txq->_xmit_lock, &bpq_netdev_xmit_lock_key);
134}
135
136static void bpq_set_lockdep_class(struct net_device *dev)
137{
David S. Millercf508b12008-07-22 14:16:42 -0700138 lockdep_set_class(&dev->addr_list_lock, &bpq_netdev_addr_lock_key);
David S. Millere8a04642008-07-17 00:34:19 -0700139 netdev_for_each_tx_queue(dev, bpq_set_lockdep_class_one, NULL);
David S. Millerc773e842008-07-08 23:13:53 -0700140}
141
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142/* ------------------------------------------------------------------------ */
143
144
145/*
146 * Get the ethernet device for a BPQ device
147 */
148static inline struct net_device *bpq_get_ether_dev(struct net_device *dev)
149{
150 struct bpqdev *bpq = netdev_priv(dev);
151
152 return bpq ? bpq->ethdev : NULL;
153}
154
155/*
156 * Get the BPQ device for the ethernet device
157 */
158static inline struct net_device *bpq_get_ax25_dev(struct net_device *dev)
159{
160 struct bpqdev *bpq;
161
Ralf Baechlebc0a7432005-10-17 12:42:32 +0100162 list_for_each_entry_rcu(bpq, &bpq_devices, bpq_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 if (bpq->ethdev == dev)
164 return bpq->axdev;
165 }
166 return NULL;
167}
168
169static inline int dev_is_ethdev(struct net_device *dev)
170{
Joe Perches8e95a202009-12-03 07:58:21 +0000171 return (dev->type == ARPHRD_ETHER && strncmp(dev->name, "dummy", 5));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172}
173
174/* ------------------------------------------------------------------------ */
175
176
177/*
178 * Receive an AX.25 frame via an ethernet interface.
179 */
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700180static int bpq_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *ptype, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181{
182 int len;
183 char * ptr;
184 struct ethhdr *eth;
185 struct bpqdev *bpq;
186
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800187 if (!net_eq(dev_net(dev), &init_net))
Eric W. Biedermane730c152007-09-17 11:53:39 -0700188 goto drop;
189
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
191 return NET_RX_DROP;
192
193 if (!pskb_may_pull(skb, sizeof(struct ethhdr)))
194 goto drop;
195
196 rcu_read_lock();
197 dev = bpq_get_ax25_dev(dev);
198
199 if (dev == NULL || !netif_running(dev))
200 goto drop_unlock;
201
202 /*
203 * if we want to accept frames from just one ethernet device
204 * we check the source address of the sender.
205 */
206
207 bpq = netdev_priv(dev);
208
209 eth = eth_hdr(skb);
210
211 if (!(bpq->acpt_addr[0] & 0x01) &&
212 memcmp(eth->h_source, bpq->acpt_addr, ETH_ALEN))
213 goto drop_unlock;
214
215 if (skb_cow(skb, sizeof(struct ethhdr)))
216 goto drop_unlock;
217
218 len = skb->data[0] + skb->data[1] * 256 - 5;
219
220 skb_pull(skb, 2); /* Remove the length bytes */
221 skb_trim(skb, len); /* Set the length of the data */
222
Stephen Hemmingerf57505f2009-01-09 13:01:31 +0000223 dev->stats.rx_packets++;
224 dev->stats.rx_bytes += len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
226 ptr = skb_push(skb, 1);
227 *ptr = 0;
228
Arnaldo Carvalho de Melo56cb5152005-04-24 18:53:06 -0700229 skb->protocol = ax25_type_trans(skb, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 netif_rx(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231unlock:
232
233 rcu_read_unlock();
234
235 return 0;
236drop_unlock:
237 kfree_skb(skb);
238 goto unlock;
239
240drop:
241 kfree_skb(skb);
242 return 0;
243}
244
245/*
246 * Send an AX.25 frame via an ethernet interface
247 */
Stephen Hemminger36e4d642009-08-31 19:50:43 +0000248static netdev_tx_t bpq_xmit(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 unsigned char *ptr;
251 struct bpqdev *bpq;
Dan Carpenterf65d1f02009-12-28 06:54:55 +0000252 struct net_device *orig_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 int size;
254
255 /*
256 * Just to be *really* sure not to send anything if the interface
257 * is down, the ethernet device may have gone.
258 */
259 if (!netif_running(dev)) {
260 kfree_skb(skb);
Patrick McHardyd77eeb72009-06-15 23:33:24 +0000261 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 }
263
Ralf Baechle3eb00272009-09-02 23:09:29 -0700264 skb_pull(skb, 1); /* Drop KISS byte */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 size = skb->len;
266
267 /*
Ralf Baechle3eb00272009-09-02 23:09:29 -0700268 * We're about to mess with the skb which may still shared with the
269 * generic networking code so unshare and ensure it's got enough
270 * space for the BPQ headers.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 */
Ralf Baechle3eb00272009-09-02 23:09:29 -0700272 if (skb_cow(skb, AX25_BPQ_HEADER_LEN)) {
273 if (net_ratelimit())
274 pr_err("bpqether: out of memory\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 kfree_skb(skb);
Ralf Baechle3eb00272009-09-02 23:09:29 -0700276
277 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 }
279
Ralf Baechle3eb00272009-09-02 23:09:29 -0700280 ptr = skb_push(skb, 2); /* Make space for length */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281
282 *ptr++ = (size + 5) % 256;
283 *ptr++ = (size + 5) / 256;
284
285 bpq = netdev_priv(dev);
286
Dan Carpenterf65d1f02009-12-28 06:54:55 +0000287 orig_dev = dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 if ((dev = bpq_get_ether_dev(dev)) == NULL) {
Dan Carpenterf65d1f02009-12-28 06:54:55 +0000289 orig_dev->stats.tx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 kfree_skb(skb);
Patrick McHardy98ca4a42009-06-12 05:20:01 +0000291 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 }
293
Arnaldo Carvalho de Melo56cb5152005-04-24 18:53:06 -0700294 skb->protocol = ax25_type_trans(skb, dev);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700295 skb_reset_network_header(skb);
Stephen Hemminger0c4e8582007-10-09 01:36:32 -0700296 dev_hard_header(skb, dev, ETH_P_BPQ, bpq->dest_addr, NULL, 0);
Stephen Hemmingerf57505f2009-01-09 13:01:31 +0000297 dev->stats.tx_packets++;
298 dev->stats.tx_bytes+=skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
300 dev_queue_xmit(skb);
301 netif_wake_queue(dev);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000302 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303}
304
305/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 * Set AX.25 callsign
307 */
308static int bpq_set_mac_address(struct net_device *dev, void *addr)
309{
310 struct sockaddr *sa = (struct sockaddr *)addr;
311
312 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
313
314 return 0;
315}
316
317/* Ioctl commands
318 *
319 * SIOCSBPQETHOPT reserved for enhancements
320 * SIOCSBPQETHADDR set the destination and accepted
321 * source ethernet address (broadcast
322 * or multicast: accept all)
323 */
324static int bpq_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
325{
326 struct bpq_ethaddr __user *ethaddr = ifr->ifr_data;
327 struct bpqdev *bpq = netdev_priv(dev);
328 struct bpq_req req;
329
330 if (!capable(CAP_NET_ADMIN))
331 return -EPERM;
332
333 switch (cmd) {
334 case SIOCSBPQETHOPT:
335 if (copy_from_user(&req, ifr->ifr_data, sizeof(struct bpq_req)))
336 return -EFAULT;
337 switch (req.cmd) {
338 case SIOCGBPQETHPARAM:
339 case SIOCSBPQETHPARAM:
340 default:
341 return -EINVAL;
342 }
343
344 break;
345
346 case SIOCSBPQETHADDR:
347 if (copy_from_user(bpq->dest_addr, ethaddr->destination, ETH_ALEN))
348 return -EFAULT;
349 if (copy_from_user(bpq->acpt_addr, ethaddr->accept, ETH_ALEN))
350 return -EFAULT;
351 break;
352
353 default:
354 return -EINVAL;
355 }
356
357 return 0;
358}
359
360/*
361 * open/close a device
362 */
363static int bpq_open(struct net_device *dev)
364{
365 netif_start_queue(dev);
366 return 0;
367}
368
369static int bpq_close(struct net_device *dev)
370{
371 netif_stop_queue(dev);
372 return 0;
373}
374
375
376/* ------------------------------------------------------------------------ */
377
378
379/*
380 * Proc filesystem
381 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382static void *bpq_seq_start(struct seq_file *seq, loff_t *pos)
Hannes Edere334f562009-02-14 11:34:52 +0000383 __acquires(RCU)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384{
385 int i = 1;
386 struct bpqdev *bpqdev;
387
388 rcu_read_lock();
389
390 if (*pos == 0)
391 return SEQ_START_TOKEN;
392
Ralf Baechlebc0a7432005-10-17 12:42:32 +0100393 list_for_each_entry_rcu(bpqdev, &bpq_devices, bpq_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 if (i == *pos)
395 return bpqdev;
396 }
397 return NULL;
398}
399
400static void *bpq_seq_next(struct seq_file *seq, void *v, loff_t *pos)
401{
402 struct list_head *p;
403
404 ++*pos;
405
406 if (v == SEQ_START_TOKEN)
Paul E. McKenneyb34bd062007-07-31 00:38:48 -0700407 p = rcu_dereference(bpq_devices.next);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 else
Paul E. McKenneyb34bd062007-07-31 00:38:48 -0700409 p = rcu_dereference(((struct bpqdev *)v)->bpq_list.next);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
411 return (p == &bpq_devices) ? NULL
Paul E. McKenneyb34bd062007-07-31 00:38:48 -0700412 : list_entry(p, struct bpqdev, bpq_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413}
414
415static void bpq_seq_stop(struct seq_file *seq, void *v)
Hannes Edere334f562009-02-14 11:34:52 +0000416 __releases(RCU)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417{
418 rcu_read_unlock();
419}
420
421
422static int bpq_seq_show(struct seq_file *seq, void *v)
423{
424 if (v == SEQ_START_TOKEN)
425 seq_puts(seq,
426 "dev ether destination accept from\n");
427 else {
428 const struct bpqdev *bpqdev = v;
429
Johannes Berge1749612008-10-27 15:59:26 -0700430 seq_printf(seq, "%-5s %-10s %pM ",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 bpqdev->axdev->name, bpqdev->ethdev->name,
Johannes Berge1749612008-10-27 15:59:26 -0700432 bpqdev->dest_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433
Joe Perches0795af52007-10-03 17:59:30 -0700434 if (is_multicast_ether_addr(bpqdev->acpt_addr))
435 seq_printf(seq, "*\n");
436 else
Johannes Berge1749612008-10-27 15:59:26 -0700437 seq_printf(seq, "%pM\n", bpqdev->acpt_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438
439 }
440 return 0;
441}
442
Jan Engelhardt4101dec2009-01-14 13:52:18 -0800443static const struct seq_operations bpq_seqops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 .start = bpq_seq_start,
445 .next = bpq_seq_next,
446 .stop = bpq_seq_stop,
447 .show = bpq_seq_show,
448};
449
450static int bpq_info_open(struct inode *inode, struct file *file)
451{
452 return seq_open(file, &bpq_seqops);
453}
454
Arjan van de Vend54b1fd2007-02-12 00:55:34 -0800455static const struct file_operations bpq_info_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 .owner = THIS_MODULE,
457 .open = bpq_info_open,
458 .read = seq_read,
459 .llseek = seq_lseek,
460 .release = seq_release,
461};
462
463
464/* ------------------------------------------------------------------------ */
465
Stephen Hemminger283767e2009-01-09 13:01:32 +0000466static const struct net_device_ops bpq_netdev_ops = {
467 .ndo_open = bpq_open,
468 .ndo_stop = bpq_close,
469 .ndo_start_xmit = bpq_xmit,
470 .ndo_set_mac_address = bpq_set_mac_address,
471 .ndo_do_ioctl = bpq_ioctl,
472};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473
474static void bpq_setup(struct net_device *dev)
475{
Stephen Hemminger283767e2009-01-09 13:01:32 +0000476 dev->netdev_ops = &bpq_netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 dev->destructor = free_netdev;
478
Ralf Baechle15b1c0e2006-12-07 15:47:08 -0800479 memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
480 memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481
482 dev->flags = 0;
483
484#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700485 dev->header_ops = &ax25_header_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486#endif
487
488 dev->type = ARPHRD_AX25;
489 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
490 dev->mtu = AX25_DEF_PACLEN;
491 dev->addr_len = AX25_ADDR_LEN;
492
493}
494
495/*
496 * Setup a new device.
497 */
498static int bpq_new_device(struct net_device *edev)
499{
500 int err;
501 struct net_device *ndev;
502 struct bpqdev *bpq;
503
504 ndev = alloc_netdev(sizeof(struct bpqdev), "bpq%d",
505 bpq_setup);
506 if (!ndev)
507 return -ENOMEM;
508
509
510 bpq = netdev_priv(ndev);
511 dev_hold(edev);
512 bpq->ethdev = edev;
513 bpq->axdev = ndev;
514
515 memcpy(bpq->dest_addr, bcast_addr, sizeof(bpq_eth_addr));
516 memcpy(bpq->acpt_addr, bcast_addr, sizeof(bpq_eth_addr));
517
518 err = dev_alloc_name(ndev, ndev->name);
519 if (err < 0)
520 goto error;
521
522 err = register_netdevice(ndev);
523 if (err)
524 goto error;
David S. Millerc773e842008-07-08 23:13:53 -0700525 bpq_set_lockdep_class(ndev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526
527 /* List protected by RTNL */
528 list_add_rcu(&bpq->bpq_list, &bpq_devices);
529 return 0;
530
531 error:
532 dev_put(edev);
533 free_netdev(ndev);
534 return err;
535
536}
537
538static void bpq_free_device(struct net_device *ndev)
539{
540 struct bpqdev *bpq = netdev_priv(ndev);
541
542 dev_put(bpq->ethdev);
543 list_del_rcu(&bpq->bpq_list);
544
545 unregister_netdevice(ndev);
546}
547
548/*
549 * Handle device status changes.
550 */
551static int bpq_device_event(struct notifier_block *this,unsigned long event, void *ptr)
552{
553 struct net_device *dev = (struct net_device *)ptr;
554
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800555 if (!net_eq(dev_net(dev), &init_net))
Eric W. Biedermane9dc8652007-09-12 13:02:17 +0200556 return NOTIFY_DONE;
557
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 if (!dev_is_ethdev(dev))
559 return NOTIFY_DONE;
560
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 switch (event) {
562 case NETDEV_UP: /* new ethernet device -> new BPQ interface */
563 if (bpq_get_ax25_dev(dev) == NULL)
564 bpq_new_device(dev);
565 break;
566
567 case NETDEV_DOWN: /* ethernet device closed -> close BPQ interface */
568 if ((dev = bpq_get_ax25_dev(dev)) != NULL)
569 dev_close(dev);
570 break;
571
572 case NETDEV_UNREGISTER: /* ethernet device removed -> free BPQ interface */
573 if ((dev = bpq_get_ax25_dev(dev)) != NULL)
574 bpq_free_device(dev);
575 break;
576 default:
577 break;
578 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579
580 return NOTIFY_DONE;
581}
582
583
584/* ------------------------------------------------------------------------ */
585
586/*
587 * Initialize driver. To be called from af_ax25 if not compiled as a
588 * module
589 */
590static int __init bpq_init_driver(void)
591{
592#ifdef CONFIG_PROC_FS
Eric W. Biederman457c4cb2007-09-12 12:01:34 +0200593 if (!proc_net_fops_create(&init_net, "bpqether", S_IRUGO, &bpq_info_fops)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 printk(KERN_ERR
595 "bpq: cannot create /proc/net/bpqether entry.\n");
596 return -ENOENT;
597 }
598#endif /* CONFIG_PROC_FS */
599
600 dev_add_pack(&bpq_packet_type);
601
602 register_netdevice_notifier(&bpq_dev_notifier);
603
604 printk(banner);
605
606 return 0;
607}
608
609static void __exit bpq_cleanup_driver(void)
610{
611 struct bpqdev *bpq;
612
613 dev_remove_pack(&bpq_packet_type);
614
615 unregister_netdevice_notifier(&bpq_dev_notifier);
616
Eric W. Biederman457c4cb2007-09-12 12:01:34 +0200617 proc_net_remove(&init_net, "bpqether");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618
619 rtnl_lock();
620 while (!list_empty(&bpq_devices)) {
621 bpq = list_entry(bpq_devices.next, struct bpqdev, bpq_list);
622 bpq_free_device(bpq->axdev);
623 }
624 rtnl_unlock();
625}
626
627MODULE_AUTHOR("Joerg Reuter DL1BKE <jreuter@yaina.de>");
628MODULE_DESCRIPTION("Transmit and receive AX.25 packets over Ethernet");
629MODULE_LICENSE("GPL");
630module_init(bpq_init_driver);
631module_exit(bpq_cleanup_driver);