blob: d95a50ae996dd4d57f78e67b51a7a3e79f8caaf3 [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070072#include <asm/uaccess.h>
73#include <linux/mm.h>
74#include <linux/interrupt.h>
75#include <linux/notifier.h>
76#include <linux/proc_fs.h>
77#include <linux/seq_file.h>
78#include <linux/stat.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070079#include <linux/module.h>
80#include <linux/init.h>
81#include <linux/rtnetlink.h>
82
83#include <net/ip.h>
84#include <net/arp.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020085#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
87#include <linux/bpqether.h>
88
Andi Kleenafa8c782012-10-04 17:11:58 -070089static const char banner[] __initconst = KERN_INFO \
Hannes Edereb33ae22009-02-14 11:33:21 +000090 "AX.25: bpqether driver version 004\n";
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
Linus Torvalds1da177e2005-04-16 15:20:36 -070092static char bcast_addr[6]={0xFF,0xFF,0xFF,0xFF,0xFF,0xFF};
93
94static char bpq_eth_addr[6];
95
David S. Millerf2ccd8f2005-08-09 19:34:12 -070096static int bpq_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097static int bpq_device_event(struct notifier_block *, unsigned long, void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
Stephen Hemminger7546dd92009-03-09 08:18:29 +000099static struct packet_type bpq_packet_type __read_mostly = {
Harvey Harrison09640e62009-02-01 00:45:17 -0800100 .type = cpu_to_be16(ETH_P_BPQ),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 .func = bpq_rcv,
102};
103
104static struct notifier_block bpq_dev_notifier = {
Jiri Pirko351638e2013-05-28 01:30:21 +0000105 .notifier_call = bpq_device_event,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106};
107
108
109struct bpqdev {
110 struct list_head bpq_list; /* list of bpq devices chain */
111 struct net_device *ethdev; /* link to ethernet device */
112 struct net_device *axdev; /* bpq device (bpq#) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 char dest_addr[6]; /* ether destination address */
114 char acpt_addr[6]; /* accept ether frames from this address only */
115};
116
117static LIST_HEAD(bpq_devices);
118
Ralf Baechle1eeb7e42006-07-10 11:24:46 -0700119/*
120 * bpqether network devices are paired with ethernet devices below them, so
121 * form a special "super class" of normal ethernet devices; split their locks
122 * off into a separate class since they always nest.
123 */
124static struct lock_class_key bpq_netdev_xmit_lock_key;
David S. Millercf508b12008-07-22 14:16:42 -0700125static struct lock_class_key bpq_netdev_addr_lock_key;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
David S. Millere8a04642008-07-17 00:34:19 -0700127static void bpq_set_lockdep_class_one(struct net_device *dev,
128 struct netdev_queue *txq,
129 void *_unused)
David S. Millerc773e842008-07-08 23:13:53 -0700130{
131 lockdep_set_class(&txq->_xmit_lock, &bpq_netdev_xmit_lock_key);
132}
133
134static void bpq_set_lockdep_class(struct net_device *dev)
135{
David S. Millercf508b12008-07-22 14:16:42 -0700136 lockdep_set_class(&dev->addr_list_lock, &bpq_netdev_addr_lock_key);
David S. Millere8a04642008-07-17 00:34:19 -0700137 netdev_for_each_tx_queue(dev, bpq_set_lockdep_class_one, NULL);
David S. Millerc773e842008-07-08 23:13:53 -0700138}
139
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140/* ------------------------------------------------------------------------ */
141
142
143/*
144 * Get the ethernet device for a BPQ device
145 */
146static inline struct net_device *bpq_get_ether_dev(struct net_device *dev)
147{
148 struct bpqdev *bpq = netdev_priv(dev);
149
150 return bpq ? bpq->ethdev : NULL;
151}
152
153/*
154 * Get the BPQ device for the ethernet device
155 */
156static inline struct net_device *bpq_get_ax25_dev(struct net_device *dev)
157{
158 struct bpqdev *bpq;
159
Ralf Baechlebc0a7432005-10-17 12:42:32 +0100160 list_for_each_entry_rcu(bpq, &bpq_devices, bpq_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 if (bpq->ethdev == dev)
162 return bpq->axdev;
163 }
164 return NULL;
165}
166
167static inline int dev_is_ethdev(struct net_device *dev)
168{
Eric Dumazet807540b2010-09-23 05:40:09 +0000169 return dev->type == ARPHRD_ETHER && strncmp(dev->name, "dummy", 5);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170}
171
172/* ------------------------------------------------------------------------ */
173
174
175/*
176 * Receive an AX.25 frame via an ethernet interface.
177 */
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700178static 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 -0700179{
180 int len;
181 char * ptr;
182 struct ethhdr *eth;
183 struct bpqdev *bpq;
184
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800185 if (!net_eq(dev_net(dev), &init_net))
Eric W. Biedermane730c152007-09-17 11:53:39 -0700186 goto drop;
187
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
189 return NET_RX_DROP;
190
191 if (!pskb_may_pull(skb, sizeof(struct ethhdr)))
192 goto drop;
193
194 rcu_read_lock();
195 dev = bpq_get_ax25_dev(dev);
196
197 if (dev == NULL || !netif_running(dev))
198 goto drop_unlock;
199
200 /*
201 * if we want to accept frames from just one ethernet device
202 * we check the source address of the sender.
203 */
204
205 bpq = netdev_priv(dev);
206
207 eth = eth_hdr(skb);
208
209 if (!(bpq->acpt_addr[0] & 0x01) &&
dingtianhongdc050c92013-12-26 19:40:31 +0800210 !ether_addr_equal(eth->h_source, bpq->acpt_addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 goto drop_unlock;
212
213 if (skb_cow(skb, sizeof(struct ethhdr)))
214 goto drop_unlock;
215
216 len = skb->data[0] + skb->data[1] * 256 - 5;
217
218 skb_pull(skb, 2); /* Remove the length bytes */
219 skb_trim(skb, len); /* Set the length of the data */
220
Stephen Hemmingerf57505f2009-01-09 13:01:31 +0000221 dev->stats.rx_packets++;
222 dev->stats.rx_bytes += len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
224 ptr = skb_push(skb, 1);
225 *ptr = 0;
226
Arnaldo Carvalho de Melo56cb5152005-04-24 18:53:06 -0700227 skb->protocol = ax25_type_trans(skb, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 netif_rx(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229unlock:
230
231 rcu_read_unlock();
232
233 return 0;
234drop_unlock:
235 kfree_skb(skb);
236 goto unlock;
237
238drop:
239 kfree_skb(skb);
240 return 0;
241}
242
243/*
244 * Send an AX.25 frame via an ethernet interface
245 */
Stephen Hemminger36e4d642009-08-31 19:50:43 +0000246static netdev_tx_t bpq_xmit(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 unsigned char *ptr;
249 struct bpqdev *bpq;
Dan Carpenterf65d1f02009-12-28 06:54:55 +0000250 struct net_device *orig_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 int size;
252
Eric W. Biederman1d5da752015-03-03 09:41:47 -0600253 if (skb->protocol == htons(ETH_P_IP))
254 return ax25_ip_xmit(skb);
255
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 /*
257 * Just to be *really* sure not to send anything if the interface
258 * is down, the ethernet device may have gone.
259 */
260 if (!netif_running(dev)) {
261 kfree_skb(skb);
Patrick McHardyd77eeb72009-06-15 23:33:24 +0000262 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 }
264
Ralf Baechle3eb00272009-09-02 23:09:29 -0700265 skb_pull(skb, 1); /* Drop KISS byte */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 size = skb->len;
267
268 /*
Ralf Baechle3eb00272009-09-02 23:09:29 -0700269 * We're about to mess with the skb which may still shared with the
270 * generic networking code so unshare and ensure it's got enough
271 * space for the BPQ headers.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 */
Ralf Baechle3eb00272009-09-02 23:09:29 -0700273 if (skb_cow(skb, AX25_BPQ_HEADER_LEN)) {
274 if (net_ratelimit())
275 pr_err("bpqether: out of memory\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 kfree_skb(skb);
Ralf Baechle3eb00272009-09-02 23:09:29 -0700277
278 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 }
280
Ralf Baechle3eb00272009-09-02 23:09:29 -0700281 ptr = skb_push(skb, 2); /* Make space for length */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282
283 *ptr++ = (size + 5) % 256;
284 *ptr++ = (size + 5) / 256;
285
286 bpq = netdev_priv(dev);
287
Dan Carpenterf65d1f02009-12-28 06:54:55 +0000288 orig_dev = dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 if ((dev = bpq_get_ether_dev(dev)) == NULL) {
Dan Carpenterf65d1f02009-12-28 06:54:55 +0000290 orig_dev->stats.tx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 kfree_skb(skb);
Patrick McHardy98ca4a42009-06-12 05:20:01 +0000292 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 }
294
Arnaldo Carvalho de Melo56cb5152005-04-24 18:53:06 -0700295 skb->protocol = ax25_type_trans(skb, dev);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700296 skb_reset_network_header(skb);
Stephen Hemminger0c4e8582007-10-09 01:36:32 -0700297 dev_hard_header(skb, dev, ETH_P_BPQ, bpq->dest_addr, NULL, 0);
Stephen Hemmingerf57505f2009-01-09 13:01:31 +0000298 dev->stats.tx_packets++;
299 dev->stats.tx_bytes+=skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
301 dev_queue_xmit(skb);
302 netif_wake_queue(dev);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000303 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304}
305
306/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 * Set AX.25 callsign
308 */
309static int bpq_set_mac_address(struct net_device *dev, void *addr)
310{
311 struct sockaddr *sa = (struct sockaddr *)addr;
312
313 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
314
315 return 0;
316}
317
318/* Ioctl commands
319 *
320 * SIOCSBPQETHOPT reserved for enhancements
321 * SIOCSBPQETHADDR set the destination and accepted
322 * source ethernet address (broadcast
323 * or multicast: accept all)
324 */
325static int bpq_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
326{
327 struct bpq_ethaddr __user *ethaddr = ifr->ifr_data;
328 struct bpqdev *bpq = netdev_priv(dev);
329 struct bpq_req req;
330
331 if (!capable(CAP_NET_ADMIN))
332 return -EPERM;
333
334 switch (cmd) {
335 case SIOCSBPQETHOPT:
336 if (copy_from_user(&req, ifr->ifr_data, sizeof(struct bpq_req)))
337 return -EFAULT;
338 switch (req.cmd) {
339 case SIOCGBPQETHPARAM:
340 case SIOCSBPQETHPARAM:
341 default:
342 return -EINVAL;
343 }
344
345 break;
346
347 case SIOCSBPQETHADDR:
348 if (copy_from_user(bpq->dest_addr, ethaddr->destination, ETH_ALEN))
349 return -EFAULT;
350 if (copy_from_user(bpq->acpt_addr, ethaddr->accept, ETH_ALEN))
351 return -EFAULT;
352 break;
353
354 default:
355 return -EINVAL;
356 }
357
358 return 0;
359}
360
361/*
362 * open/close a device
363 */
364static int bpq_open(struct net_device *dev)
365{
366 netif_start_queue(dev);
367 return 0;
368}
369
370static int bpq_close(struct net_device *dev)
371{
372 netif_stop_queue(dev);
373 return 0;
374}
375
376
377/* ------------------------------------------------------------------------ */
378
379
380/*
381 * Proc filesystem
382 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383static void *bpq_seq_start(struct seq_file *seq, loff_t *pos)
Hannes Edere334f562009-02-14 11:34:52 +0000384 __acquires(RCU)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385{
386 int i = 1;
387 struct bpqdev *bpqdev;
388
389 rcu_read_lock();
390
391 if (*pos == 0)
392 return SEQ_START_TOKEN;
393
Ralf Baechlebc0a7432005-10-17 12:42:32 +0100394 list_for_each_entry_rcu(bpqdev, &bpq_devices, bpq_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 if (i == *pos)
396 return bpqdev;
397 }
398 return NULL;
399}
400
401static void *bpq_seq_next(struct seq_file *seq, void *v, loff_t *pos)
402{
403 struct list_head *p;
Eric Dumazet13707f92011-01-26 19:28:23 +0000404 struct bpqdev *bpqdev = v;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405
406 ++*pos;
407
408 if (v == SEQ_START_TOKEN)
Eric Dumazet13707f92011-01-26 19:28:23 +0000409 p = rcu_dereference(list_next_rcu(&bpq_devices));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 else
Eric Dumazet13707f92011-01-26 19:28:23 +0000411 p = rcu_dereference(list_next_rcu(&bpqdev->bpq_list));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412
413 return (p == &bpq_devices) ? NULL
Paul E. McKenneyb34bd062007-07-31 00:38:48 -0700414 : list_entry(p, struct bpqdev, bpq_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415}
416
417static void bpq_seq_stop(struct seq_file *seq, void *v)
Hannes Edere334f562009-02-14 11:34:52 +0000418 __releases(RCU)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419{
420 rcu_read_unlock();
421}
422
423
424static int bpq_seq_show(struct seq_file *seq, void *v)
425{
426 if (v == SEQ_START_TOKEN)
427 seq_puts(seq,
428 "dev ether destination accept from\n");
429 else {
430 const struct bpqdev *bpqdev = v;
431
Johannes Berge1749612008-10-27 15:59:26 -0700432 seq_printf(seq, "%-5s %-10s %pM ",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 bpqdev->axdev->name, bpqdev->ethdev->name,
Johannes Berge1749612008-10-27 15:59:26 -0700434 bpqdev->dest_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
Joe Perches0795af52007-10-03 17:59:30 -0700436 if (is_multicast_ether_addr(bpqdev->acpt_addr))
437 seq_printf(seq, "*\n");
438 else
Johannes Berge1749612008-10-27 15:59:26 -0700439 seq_printf(seq, "%pM\n", bpqdev->acpt_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
441 }
442 return 0;
443}
444
Jan Engelhardt4101dec2009-01-14 13:52:18 -0800445static const struct seq_operations bpq_seqops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 .start = bpq_seq_start,
447 .next = bpq_seq_next,
448 .stop = bpq_seq_stop,
449 .show = bpq_seq_show,
450};
451
452static int bpq_info_open(struct inode *inode, struct file *file)
453{
454 return seq_open(file, &bpq_seqops);
455}
456
Arjan van de Vend54b1fd2007-02-12 00:55:34 -0800457static const struct file_operations bpq_info_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 .owner = THIS_MODULE,
459 .open = bpq_info_open,
460 .read = seq_read,
461 .llseek = seq_lseek,
462 .release = seq_release,
463};
464
465
466/* ------------------------------------------------------------------------ */
467
Stephen Hemminger283767e2009-01-09 13:01:32 +0000468static const struct net_device_ops bpq_netdev_ops = {
469 .ndo_open = bpq_open,
470 .ndo_stop = bpq_close,
471 .ndo_start_xmit = bpq_xmit,
472 .ndo_set_mac_address = bpq_set_mac_address,
473 .ndo_do_ioctl = bpq_ioctl,
474};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475
476static void bpq_setup(struct net_device *dev)
477{
Stephen Hemminger283767e2009-01-09 13:01:32 +0000478 dev->netdev_ops = &bpq_netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 dev->destructor = free_netdev;
480
Ralf Baechle15b1c0e2006-12-07 15:47:08 -0800481 memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
482 memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
484 dev->flags = 0;
Ralf Baechleaa43c5f2015-07-04 11:22:30 +0200485 dev->features = NETIF_F_LLTX; /* Allow recursion */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486
487#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700488 dev->header_ops = &ax25_header_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489#endif
490
491 dev->type = ARPHRD_AX25;
492 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
493 dev->mtu = AX25_DEF_PACLEN;
494 dev->addr_len = AX25_ADDR_LEN;
495
496}
497
498/*
499 * Setup a new device.
500 */
501static int bpq_new_device(struct net_device *edev)
502{
503 int err;
504 struct net_device *ndev;
505 struct bpqdev *bpq;
506
Tom Gundersenc835a672014-07-14 16:37:24 +0200507 ndev = alloc_netdev(sizeof(struct bpqdev), "bpq%d", NET_NAME_UNKNOWN,
508 bpq_setup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 if (!ndev)
510 return -ENOMEM;
511
512
513 bpq = netdev_priv(ndev);
514 dev_hold(edev);
515 bpq->ethdev = edev;
516 bpq->axdev = ndev;
517
518 memcpy(bpq->dest_addr, bcast_addr, sizeof(bpq_eth_addr));
519 memcpy(bpq->acpt_addr, bcast_addr, sizeof(bpq_eth_addr));
520
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 err = register_netdevice(ndev);
522 if (err)
523 goto error;
David S. Millerc773e842008-07-08 23:13:53 -0700524 bpq_set_lockdep_class(ndev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525
526 /* List protected by RTNL */
527 list_add_rcu(&bpq->bpq_list, &bpq_devices);
528 return 0;
529
530 error:
531 dev_put(edev);
532 free_netdev(ndev);
533 return err;
534
535}
536
537static void bpq_free_device(struct net_device *ndev)
538{
539 struct bpqdev *bpq = netdev_priv(ndev);
540
541 dev_put(bpq->ethdev);
542 list_del_rcu(&bpq->bpq_list);
543
544 unregister_netdevice(ndev);
545}
546
547/*
548 * Handle device status changes.
549 */
Jiri Pirko351638e2013-05-28 01:30:21 +0000550static int bpq_device_event(struct notifier_block *this,
551 unsigned long event, void *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552{
Jiri Pirko351638e2013-05-28 01:30:21 +0000553 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554
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
Gao fengd4beaa62013-02-18 01:34:54 +0000593 if (!proc_create("bpqether", S_IRUGO, init_net.proc_net,
594 &bpq_info_fops)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 printk(KERN_ERR
596 "bpq: cannot create /proc/net/bpqether entry.\n");
597 return -ENOENT;
598 }
599#endif /* CONFIG_PROC_FS */
600
601 dev_add_pack(&bpq_packet_type);
602
603 register_netdevice_notifier(&bpq_dev_notifier);
604
605 printk(banner);
606
607 return 0;
608}
609
610static void __exit bpq_cleanup_driver(void)
611{
612 struct bpqdev *bpq;
613
614 dev_remove_pack(&bpq_packet_type);
615
616 unregister_netdevice_notifier(&bpq_dev_notifier);
617
Gao fengece31ff2013-02-18 01:34:56 +0000618 remove_proc_entry("bpqether", init_net.proc_net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619
620 rtnl_lock();
621 while (!list_empty(&bpq_devices)) {
622 bpq = list_entry(bpq_devices.next, struct bpqdev, bpq_list);
623 bpq_free_device(bpq->axdev);
624 }
625 rtnl_unlock();
626}
627
628MODULE_AUTHOR("Joerg Reuter DL1BKE <jreuter@yaina.de>");
629MODULE_DESCRIPTION("Transmit and receive AX.25 packets over Ethernet");
630MODULE_LICENSE("GPL");
631module_init(bpq_init_driver);
632module_exit(bpq_cleanup_driver);