Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
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 | ||
1da177e4 LT |
57 | #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> | |
5a0e3ad6 | 64 | #include <linux/slab.h> |
1da177e4 LT |
65 | #include <net/ax25.h> |
66 | #include <linux/inet.h> | |
67 | #include <linux/netdevice.h> | |
0795af57 | 68 | #include <linux/etherdevice.h> |
1da177e4 LT |
69 | #include <linux/if_arp.h> |
70 | #include <linux/skbuff.h> | |
71 | #include <net/sock.h> | |
1da177e4 LT |
72 | #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> | |
1da177e4 LT |
79 | #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> | |
457c4cbc | 85 | #include <net/net_namespace.h> |
1da177e4 LT |
86 | |
87 | #include <linux/bpqether.h> | |
88 | ||
afa8c78b | 89 | static const char banner[] __initconst = KERN_INFO \ |
eb33ae24 | 90 | "AX.25: bpqether driver version 004\n"; |
1da177e4 | 91 | |
1da177e4 LT |
92 | static char bcast_addr[6]={0xFF,0xFF,0xFF,0xFF,0xFF,0xFF}; |
93 | ||
94 | static char bpq_eth_addr[6]; | |
95 | ||
f2ccd8fa | 96 | static int bpq_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *); |
1da177e4 | 97 | static int bpq_device_event(struct notifier_block *, unsigned long, void *); |
1da177e4 | 98 | |
7546dd97 | 99 | static struct packet_type bpq_packet_type __read_mostly = { |
09640e63 | 100 | .type = cpu_to_be16(ETH_P_BPQ), |
1da177e4 LT |
101 | .func = bpq_rcv, |
102 | }; | |
103 | ||
104 | static struct notifier_block bpq_dev_notifier = { | |
351638e7 | 105 | .notifier_call = bpq_device_event, |
1da177e4 LT |
106 | }; |
107 | ||
108 | ||
109 | struct 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#) */ | |
1da177e4 LT |
113 | char dest_addr[6]; /* ether destination address */ |
114 | char acpt_addr[6]; /* accept ether frames from this address only */ | |
115 | }; | |
116 | ||
117 | static LIST_HEAD(bpq_devices); | |
118 | ||
1eeb7e42 RB |
119 | /* |
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 | */ | |
124 | static struct lock_class_key bpq_netdev_xmit_lock_key; | |
cf508b12 | 125 | static struct lock_class_key bpq_netdev_addr_lock_key; |
1da177e4 | 126 | |
e8a0464c DM |
127 | static void bpq_set_lockdep_class_one(struct net_device *dev, |
128 | struct netdev_queue *txq, | |
129 | void *_unused) | |
c773e847 DM |
130 | { |
131 | lockdep_set_class(&txq->_xmit_lock, &bpq_netdev_xmit_lock_key); | |
132 | } | |
133 | ||
134 | static void bpq_set_lockdep_class(struct net_device *dev) | |
135 | { | |
cf508b12 | 136 | lockdep_set_class(&dev->addr_list_lock, &bpq_netdev_addr_lock_key); |
e8a0464c | 137 | netdev_for_each_tx_queue(dev, bpq_set_lockdep_class_one, NULL); |
c773e847 DM |
138 | } |
139 | ||
1da177e4 LT |
140 | /* ------------------------------------------------------------------------ */ |
141 | ||
142 | ||
143 | /* | |
144 | * Get the ethernet device for a BPQ device | |
145 | */ | |
146 | static 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 | */ | |
156 | static inline struct net_device *bpq_get_ax25_dev(struct net_device *dev) | |
157 | { | |
158 | struct bpqdev *bpq; | |
159 | ||
bc0a7438 | 160 | list_for_each_entry_rcu(bpq, &bpq_devices, bpq_list) { |
1da177e4 LT |
161 | if (bpq->ethdev == dev) |
162 | return bpq->axdev; | |
163 | } | |
164 | return NULL; | |
165 | } | |
166 | ||
167 | static inline int dev_is_ethdev(struct net_device *dev) | |
168 | { | |
807540ba | 169 | return dev->type == ARPHRD_ETHER && strncmp(dev->name, "dummy", 5); |
1da177e4 LT |
170 | } |
171 | ||
172 | /* ------------------------------------------------------------------------ */ | |
173 | ||
174 | ||
175 | /* | |
176 | * Receive an AX.25 frame via an ethernet interface. | |
177 | */ | |
f2ccd8fa | 178 | static int bpq_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *ptype, struct net_device *orig_dev) |
1da177e4 LT |
179 | { |
180 | int len; | |
181 | char * ptr; | |
182 | struct ethhdr *eth; | |
183 | struct bpqdev *bpq; | |
184 | ||
09ad9bc7 | 185 | if (!net_eq(dev_net(dev), &init_net)) |
e730c155 EB |
186 | goto drop; |
187 | ||
1da177e4 LT |
188 | 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) && | |
dc050c9e | 210 | !ether_addr_equal(eth->h_source, bpq->acpt_addr)) |
1da177e4 LT |
211 | 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 | ||
f57505fd SH |
221 | dev->stats.rx_packets++; |
222 | dev->stats.rx_bytes += len; | |
1da177e4 LT |
223 | |
224 | ptr = skb_push(skb, 1); | |
225 | *ptr = 0; | |
226 | ||
56cb5156 | 227 | skb->protocol = ax25_type_trans(skb, dev); |
1da177e4 | 228 | netif_rx(skb); |
1da177e4 LT |
229 | unlock: |
230 | ||
231 | rcu_read_unlock(); | |
232 | ||
233 | return 0; | |
234 | drop_unlock: | |
235 | kfree_skb(skb); | |
236 | goto unlock; | |
237 | ||
238 | drop: | |
239 | kfree_skb(skb); | |
240 | return 0; | |
241 | } | |
242 | ||
243 | /* | |
244 | * Send an AX.25 frame via an ethernet interface | |
245 | */ | |
36e4d64a | 246 | static netdev_tx_t bpq_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 247 | { |
1da177e4 LT |
248 | unsigned char *ptr; |
249 | struct bpqdev *bpq; | |
f65d1f08 | 250 | struct net_device *orig_dev; |
1da177e4 LT |
251 | int size; |
252 | ||
1d5da757 EB |
253 | if (skb->protocol == htons(ETH_P_IP)) |
254 | return ax25_ip_xmit(skb); | |
255 | ||
1da177e4 LT |
256 | /* |
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); | |
d77eeb70 | 262 | return NETDEV_TX_OK; |
1da177e4 LT |
263 | } |
264 | ||
3eb00275 | 265 | skb_pull(skb, 1); /* Drop KISS byte */ |
1da177e4 LT |
266 | size = skb->len; |
267 | ||
268 | /* | |
3eb00275 RB |
269 | * 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. | |
1da177e4 | 272 | */ |
3eb00275 RB |
273 | if (skb_cow(skb, AX25_BPQ_HEADER_LEN)) { |
274 | if (net_ratelimit()) | |
275 | pr_err("bpqether: out of memory\n"); | |
1da177e4 | 276 | kfree_skb(skb); |
3eb00275 RB |
277 | |
278 | return NETDEV_TX_OK; | |
1da177e4 LT |
279 | } |
280 | ||
3eb00275 | 281 | ptr = skb_push(skb, 2); /* Make space for length */ |
1da177e4 LT |
282 | |
283 | *ptr++ = (size + 5) % 256; | |
284 | *ptr++ = (size + 5) / 256; | |
285 | ||
286 | bpq = netdev_priv(dev); | |
287 | ||
f65d1f08 | 288 | orig_dev = dev; |
1da177e4 | 289 | if ((dev = bpq_get_ether_dev(dev)) == NULL) { |
f65d1f08 | 290 | orig_dev->stats.tx_dropped++; |
1da177e4 | 291 | kfree_skb(skb); |
98ca4a46 | 292 | return NETDEV_TX_OK; |
1da177e4 LT |
293 | } |
294 | ||
56cb5156 | 295 | skb->protocol = ax25_type_trans(skb, dev); |
c1d2bbe1 | 296 | skb_reset_network_header(skb); |
0c4e8581 | 297 | dev_hard_header(skb, dev, ETH_P_BPQ, bpq->dest_addr, NULL, 0); |
f57505fd SH |
298 | dev->stats.tx_packets++; |
299 | dev->stats.tx_bytes+=skb->len; | |
1da177e4 LT |
300 | |
301 | dev_queue_xmit(skb); | |
302 | netif_wake_queue(dev); | |
6ed10654 | 303 | return NETDEV_TX_OK; |
1da177e4 LT |
304 | } |
305 | ||
1da177e4 LT |
306 | /* |
307 | * Set AX.25 callsign | |
308 | */ | |
309 | static 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 | */ | |
325 | static 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 | */ | |
364 | static int bpq_open(struct net_device *dev) | |
365 | { | |
366 | netif_start_queue(dev); | |
367 | return 0; | |
368 | } | |
369 | ||
370 | static 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 | */ | |
1da177e4 | 383 | static void *bpq_seq_start(struct seq_file *seq, loff_t *pos) |
e334f564 | 384 | __acquires(RCU) |
1da177e4 LT |
385 | { |
386 | int i = 1; | |
387 | struct bpqdev *bpqdev; | |
388 | ||
389 | rcu_read_lock(); | |
390 | ||
391 | if (*pos == 0) | |
392 | return SEQ_START_TOKEN; | |
393 | ||
bc0a7438 | 394 | list_for_each_entry_rcu(bpqdev, &bpq_devices, bpq_list) { |
1da177e4 LT |
395 | if (i == *pos) |
396 | return bpqdev; | |
397 | } | |
398 | return NULL; | |
399 | } | |
400 | ||
401 | static void *bpq_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
402 | { | |
403 | struct list_head *p; | |
13707f9e | 404 | struct bpqdev *bpqdev = v; |
1da177e4 LT |
405 | |
406 | ++*pos; | |
407 | ||
408 | if (v == SEQ_START_TOKEN) | |
13707f9e | 409 | p = rcu_dereference(list_next_rcu(&bpq_devices)); |
1da177e4 | 410 | else |
13707f9e | 411 | p = rcu_dereference(list_next_rcu(&bpqdev->bpq_list)); |
1da177e4 LT |
412 | |
413 | return (p == &bpq_devices) ? NULL | |
b34bd06e | 414 | : list_entry(p, struct bpqdev, bpq_list); |
1da177e4 LT |
415 | } |
416 | ||
417 | static void bpq_seq_stop(struct seq_file *seq, void *v) | |
e334f564 | 418 | __releases(RCU) |
1da177e4 LT |
419 | { |
420 | rcu_read_unlock(); | |
421 | } | |
422 | ||
423 | ||
424 | static 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 | ||
e174961c | 432 | seq_printf(seq, "%-5s %-10s %pM ", |
1da177e4 | 433 | bpqdev->axdev->name, bpqdev->ethdev->name, |
e174961c | 434 | bpqdev->dest_addr); |
1da177e4 | 435 | |
0795af57 JP |
436 | if (is_multicast_ether_addr(bpqdev->acpt_addr)) |
437 | seq_printf(seq, "*\n"); | |
438 | else | |
e174961c | 439 | seq_printf(seq, "%pM\n", bpqdev->acpt_addr); |
1da177e4 LT |
440 | |
441 | } | |
442 | return 0; | |
443 | } | |
444 | ||
4101dec9 | 445 | static const struct seq_operations bpq_seqops = { |
1da177e4 LT |
446 | .start = bpq_seq_start, |
447 | .next = bpq_seq_next, | |
448 | .stop = bpq_seq_stop, | |
449 | .show = bpq_seq_show, | |
450 | }; | |
451 | ||
452 | static int bpq_info_open(struct inode *inode, struct file *file) | |
453 | { | |
454 | return seq_open(file, &bpq_seqops); | |
455 | } | |
456 | ||
d54b1fdb | 457 | static const struct file_operations bpq_info_fops = { |
1da177e4 LT |
458 | .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 | ||
283767e7 SH |
468 | static 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 | }; | |
1da177e4 LT |
475 | |
476 | static void bpq_setup(struct net_device *dev) | |
477 | { | |
283767e7 | 478 | dev->netdev_ops = &bpq_netdev_ops; |
1da177e4 LT |
479 | dev->destructor = free_netdev; |
480 | ||
15b1c0e8 RB |
481 | memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN); |
482 | memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN); | |
1da177e4 LT |
483 | |
484 | dev->flags = 0; | |
aa43c5ff | 485 | dev->features = NETIF_F_LLTX; /* Allow recursion */ |
1da177e4 LT |
486 | |
487 | #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) | |
3b04ddde | 488 | dev->header_ops = &ax25_header_ops; |
1da177e4 LT |
489 | #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 | */ | |
501 | static int bpq_new_device(struct net_device *edev) | |
502 | { | |
503 | int err; | |
504 | struct net_device *ndev; | |
505 | struct bpqdev *bpq; | |
506 | ||
c835a677 TG |
507 | ndev = alloc_netdev(sizeof(struct bpqdev), "bpq%d", NET_NAME_UNKNOWN, |
508 | bpq_setup); | |
1da177e4 LT |
509 | 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 | ||
1da177e4 LT |
521 | err = register_netdevice(ndev); |
522 | if (err) | |
523 | goto error; | |
c773e847 | 524 | bpq_set_lockdep_class(ndev); |
1da177e4 LT |
525 | |
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 | ||
537 | static 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 | */ | |
351638e7 JP |
550 | static int bpq_device_event(struct notifier_block *this, |
551 | unsigned long event, void *ptr) | |
1da177e4 | 552 | { |
351638e7 | 553 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
1da177e4 | 554 | |
09ad9bc7 | 555 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
556 | return NOTIFY_DONE; |
557 | ||
1da177e4 LT |
558 | if (!dev_is_ethdev(dev)) |
559 | return NOTIFY_DONE; | |
560 | ||
1da177e4 LT |
561 | 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 | } | |
1da177e4 LT |
579 | |
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 | */ | |
590 | static int __init bpq_init_driver(void) | |
591 | { | |
592 | #ifdef CONFIG_PROC_FS | |
d4beaa66 G |
593 | if (!proc_create("bpqether", S_IRUGO, init_net.proc_net, |
594 | &bpq_info_fops)) { | |
1da177e4 LT |
595 | 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 | ||
610 | static 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 | ||
ece31ffd | 618 | remove_proc_entry("bpqether", init_net.proc_net); |
1da177e4 LT |
619 | |
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 | ||
628 | MODULE_AUTHOR("Joerg Reuter DL1BKE <jreuter@yaina.de>"); | |
629 | MODULE_DESCRIPTION("Transmit and receive AX.25 packets over Ethernet"); | |
630 | MODULE_LICENSE("GPL"); | |
631 | module_init(bpq_init_driver); | |
632 | module_exit(bpq_cleanup_driver); |