This source file includes following definitions.
- bpq_get_ether_dev
- bpq_get_ax25_dev
- dev_is_ethdev
- bpq_rcv
- bpq_xmit
- bpq_set_mac_address
- bpq_ioctl
- bpq_open
- bpq_close
- bpq_seq_start
- bpq_seq_next
- bpq_seq_stop
- bpq_seq_show
- bpq_setup
- bpq_new_device
- bpq_free_device
- bpq_device_event
- bpq_init_driver
- bpq_cleanup_driver
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52 #include <linux/errno.h>
53 #include <linux/types.h>
54 #include <linux/socket.h>
55 #include <linux/in.h>
56 #include <linux/kernel.h>
57 #include <linux/string.h>
58 #include <linux/net.h>
59 #include <linux/slab.h>
60 #include <net/ax25.h>
61 #include <linux/inet.h>
62 #include <linux/netdevice.h>
63 #include <linux/etherdevice.h>
64 #include <linux/if_arp.h>
65 #include <linux/skbuff.h>
66 #include <net/sock.h>
67 #include <linux/uaccess.h>
68 #include <linux/mm.h>
69 #include <linux/interrupt.h>
70 #include <linux/notifier.h>
71 #include <linux/proc_fs.h>
72 #include <linux/seq_file.h>
73 #include <linux/stat.h>
74 #include <linux/module.h>
75 #include <linux/init.h>
76 #include <linux/rtnetlink.h>
77
78 #include <net/ip.h>
79 #include <net/arp.h>
80 #include <net/net_namespace.h>
81
82 #include <linux/bpqether.h>
83
84 static const char banner[] __initconst = KERN_INFO \
85 "AX.25: bpqether driver version 004\n";
86
87 static int bpq_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
88 static int bpq_device_event(struct notifier_block *, unsigned long, void *);
89
90 static struct packet_type bpq_packet_type __read_mostly = {
91 .type = cpu_to_be16(ETH_P_BPQ),
92 .func = bpq_rcv,
93 };
94
95 static struct notifier_block bpq_dev_notifier = {
96 .notifier_call = bpq_device_event,
97 };
98
99
100 struct bpqdev {
101 struct list_head bpq_list;
102 struct net_device *ethdev;
103 struct net_device *axdev;
104 char dest_addr[6];
105 char acpt_addr[6];
106 };
107
108 static LIST_HEAD(bpq_devices);
109
110
111
112
113
114
115
116 static inline struct net_device *bpq_get_ether_dev(struct net_device *dev)
117 {
118 struct bpqdev *bpq = netdev_priv(dev);
119
120 return bpq ? bpq->ethdev : NULL;
121 }
122
123
124
125
126 static inline struct net_device *bpq_get_ax25_dev(struct net_device *dev)
127 {
128 struct bpqdev *bpq;
129
130 list_for_each_entry_rcu(bpq, &bpq_devices, bpq_list,
131 lockdep_rtnl_is_held()) {
132 if (bpq->ethdev == dev)
133 return bpq->axdev;
134 }
135 return NULL;
136 }
137
138 static inline int dev_is_ethdev(struct net_device *dev)
139 {
140 return dev->type == ARPHRD_ETHER && strncmp(dev->name, "dummy", 5);
141 }
142
143
144
145
146
147
148
149 static int bpq_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *ptype, struct net_device *orig_dev)
150 {
151 int len;
152 char * ptr;
153 struct ethhdr *eth;
154 struct bpqdev *bpq;
155
156 if (!net_eq(dev_net(dev), &init_net))
157 goto drop;
158
159 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
160 return NET_RX_DROP;
161
162 if (!pskb_may_pull(skb, sizeof(struct ethhdr)))
163 goto drop;
164
165 rcu_read_lock();
166 dev = bpq_get_ax25_dev(dev);
167
168 if (dev == NULL || !netif_running(dev))
169 goto drop_unlock;
170
171
172
173
174
175
176 bpq = netdev_priv(dev);
177
178 eth = eth_hdr(skb);
179
180 if (!(bpq->acpt_addr[0] & 0x01) &&
181 !ether_addr_equal(eth->h_source, bpq->acpt_addr))
182 goto drop_unlock;
183
184 if (skb_cow(skb, sizeof(struct ethhdr)))
185 goto drop_unlock;
186
187 len = skb->data[0] + skb->data[1] * 256 - 5;
188
189 skb_pull(skb, 2);
190 skb_trim(skb, len);
191
192 dev->stats.rx_packets++;
193 dev->stats.rx_bytes += len;
194
195 ptr = skb_push(skb, 1);
196 *ptr = 0;
197
198 skb->protocol = ax25_type_trans(skb, dev);
199 netif_rx(skb);
200 unlock:
201
202 rcu_read_unlock();
203
204 return 0;
205 drop_unlock:
206 kfree_skb(skb);
207 goto unlock;
208
209 drop:
210 kfree_skb(skb);
211 return 0;
212 }
213
214
215
216
217 static netdev_tx_t bpq_xmit(struct sk_buff *skb, struct net_device *dev)
218 {
219 unsigned char *ptr;
220 struct bpqdev *bpq;
221 struct net_device *orig_dev;
222 int size;
223
224 if (skb->protocol == htons(ETH_P_IP))
225 return ax25_ip_xmit(skb);
226
227
228
229
230
231 if (!netif_running(dev)) {
232 kfree_skb(skb);
233 return NETDEV_TX_OK;
234 }
235
236 skb_pull(skb, 1);
237 size = skb->len;
238
239
240
241
242
243
244 if (skb_cow(skb, AX25_BPQ_HEADER_LEN)) {
245 if (net_ratelimit())
246 pr_err("bpqether: out of memory\n");
247 kfree_skb(skb);
248
249 return NETDEV_TX_OK;
250 }
251
252 ptr = skb_push(skb, 2);
253
254 *ptr++ = (size + 5) % 256;
255 *ptr++ = (size + 5) / 256;
256
257 bpq = netdev_priv(dev);
258
259 orig_dev = dev;
260 if ((dev = bpq_get_ether_dev(dev)) == NULL) {
261 orig_dev->stats.tx_dropped++;
262 kfree_skb(skb);
263 return NETDEV_TX_OK;
264 }
265
266 skb->protocol = ax25_type_trans(skb, dev);
267 skb_reset_network_header(skb);
268 dev_hard_header(skb, dev, ETH_P_BPQ, bpq->dest_addr, NULL, 0);
269 dev->stats.tx_packets++;
270 dev->stats.tx_bytes+=skb->len;
271
272 dev_queue_xmit(skb);
273 netif_wake_queue(dev);
274 return NETDEV_TX_OK;
275 }
276
277
278
279
280 static int bpq_set_mac_address(struct net_device *dev, void *addr)
281 {
282 struct sockaddr *sa = (struct sockaddr *)addr;
283
284 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
285
286 return 0;
287 }
288
289
290
291
292
293
294
295
296 static int bpq_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
297 {
298 struct bpq_ethaddr __user *ethaddr = ifr->ifr_data;
299 struct bpqdev *bpq = netdev_priv(dev);
300 struct bpq_req req;
301
302 if (!capable(CAP_NET_ADMIN))
303 return -EPERM;
304
305 switch (cmd) {
306 case SIOCSBPQETHOPT:
307 if (copy_from_user(&req, ifr->ifr_data, sizeof(struct bpq_req)))
308 return -EFAULT;
309 switch (req.cmd) {
310 case SIOCGBPQETHPARAM:
311 case SIOCSBPQETHPARAM:
312 default:
313 return -EINVAL;
314 }
315
316 break;
317
318 case SIOCSBPQETHADDR:
319 if (copy_from_user(bpq->dest_addr, ethaddr->destination, ETH_ALEN))
320 return -EFAULT;
321 if (copy_from_user(bpq->acpt_addr, ethaddr->accept, ETH_ALEN))
322 return -EFAULT;
323 break;
324
325 default:
326 return -EINVAL;
327 }
328
329 return 0;
330 }
331
332
333
334
335 static int bpq_open(struct net_device *dev)
336 {
337 netif_start_queue(dev);
338 return 0;
339 }
340
341 static int bpq_close(struct net_device *dev)
342 {
343 netif_stop_queue(dev);
344 return 0;
345 }
346
347
348
349
350
351
352
353
354 static void *bpq_seq_start(struct seq_file *seq, loff_t *pos)
355 __acquires(RCU)
356 {
357 int i = 1;
358 struct bpqdev *bpqdev;
359
360 rcu_read_lock();
361
362 if (*pos == 0)
363 return SEQ_START_TOKEN;
364
365 list_for_each_entry_rcu(bpqdev, &bpq_devices, bpq_list) {
366 if (i == *pos)
367 return bpqdev;
368 }
369 return NULL;
370 }
371
372 static void *bpq_seq_next(struct seq_file *seq, void *v, loff_t *pos)
373 {
374 struct list_head *p;
375 struct bpqdev *bpqdev = v;
376
377 ++*pos;
378
379 if (v == SEQ_START_TOKEN)
380 p = rcu_dereference(list_next_rcu(&bpq_devices));
381 else
382 p = rcu_dereference(list_next_rcu(&bpqdev->bpq_list));
383
384 return (p == &bpq_devices) ? NULL
385 : list_entry(p, struct bpqdev, bpq_list);
386 }
387
388 static void bpq_seq_stop(struct seq_file *seq, void *v)
389 __releases(RCU)
390 {
391 rcu_read_unlock();
392 }
393
394
395 static int bpq_seq_show(struct seq_file *seq, void *v)
396 {
397 if (v == SEQ_START_TOKEN)
398 seq_puts(seq,
399 "dev ether destination accept from\n");
400 else {
401 const struct bpqdev *bpqdev = v;
402
403 seq_printf(seq, "%-5s %-10s %pM ",
404 bpqdev->axdev->name, bpqdev->ethdev->name,
405 bpqdev->dest_addr);
406
407 if (is_multicast_ether_addr(bpqdev->acpt_addr))
408 seq_printf(seq, "*\n");
409 else
410 seq_printf(seq, "%pM\n", bpqdev->acpt_addr);
411
412 }
413 return 0;
414 }
415
416 static const struct seq_operations bpq_seqops = {
417 .start = bpq_seq_start,
418 .next = bpq_seq_next,
419 .stop = bpq_seq_stop,
420 .show = bpq_seq_show,
421 };
422
423
424
425 static const struct net_device_ops bpq_netdev_ops = {
426 .ndo_open = bpq_open,
427 .ndo_stop = bpq_close,
428 .ndo_start_xmit = bpq_xmit,
429 .ndo_set_mac_address = bpq_set_mac_address,
430 .ndo_do_ioctl = bpq_ioctl,
431 };
432
433 static void bpq_setup(struct net_device *dev)
434 {
435 dev->netdev_ops = &bpq_netdev_ops;
436 dev->needs_free_netdev = true;
437
438 memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
439 memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN);
440
441 dev->flags = 0;
442 dev->features = NETIF_F_LLTX;
443
444 #if IS_ENABLED(CONFIG_AX25)
445 dev->header_ops = &ax25_header_ops;
446 #endif
447
448 dev->type = ARPHRD_AX25;
449 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
450 dev->mtu = AX25_DEF_PACLEN;
451 dev->addr_len = AX25_ADDR_LEN;
452
453 }
454
455
456
457
458 static int bpq_new_device(struct net_device *edev)
459 {
460 int err;
461 struct net_device *ndev;
462 struct bpqdev *bpq;
463
464 ndev = alloc_netdev(sizeof(struct bpqdev), "bpq%d", NET_NAME_UNKNOWN,
465 bpq_setup);
466 if (!ndev)
467 return -ENOMEM;
468
469
470 bpq = netdev_priv(ndev);
471 dev_hold(edev);
472 bpq->ethdev = edev;
473 bpq->axdev = ndev;
474
475 eth_broadcast_addr(bpq->dest_addr);
476 eth_broadcast_addr(bpq->acpt_addr);
477
478 err = register_netdevice(ndev);
479 if (err)
480 goto error;
481
482
483 list_add_rcu(&bpq->bpq_list, &bpq_devices);
484 return 0;
485
486 error:
487 dev_put(edev);
488 free_netdev(ndev);
489 return err;
490
491 }
492
493 static void bpq_free_device(struct net_device *ndev)
494 {
495 struct bpqdev *bpq = netdev_priv(ndev);
496
497 dev_put(bpq->ethdev);
498 list_del_rcu(&bpq->bpq_list);
499
500 unregister_netdevice(ndev);
501 }
502
503
504
505
506 static int bpq_device_event(struct notifier_block *this,
507 unsigned long event, void *ptr)
508 {
509 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
510
511 if (!net_eq(dev_net(dev), &init_net))
512 return NOTIFY_DONE;
513
514 if (!dev_is_ethdev(dev))
515 return NOTIFY_DONE;
516
517 switch (event) {
518 case NETDEV_UP:
519 if (bpq_get_ax25_dev(dev) == NULL)
520 bpq_new_device(dev);
521 break;
522
523 case NETDEV_DOWN:
524 if ((dev = bpq_get_ax25_dev(dev)) != NULL)
525 dev_close(dev);
526 break;
527
528 case NETDEV_UNREGISTER:
529 if ((dev = bpq_get_ax25_dev(dev)) != NULL)
530 bpq_free_device(dev);
531 break;
532 default:
533 break;
534 }
535
536 return NOTIFY_DONE;
537 }
538
539
540
541
542
543
544
545
546 static int __init bpq_init_driver(void)
547 {
548 #ifdef CONFIG_PROC_FS
549 if (!proc_create_seq("bpqether", 0444, init_net.proc_net, &bpq_seqops)) {
550 printk(KERN_ERR
551 "bpq: cannot create /proc/net/bpqether entry.\n");
552 return -ENOENT;
553 }
554 #endif
555
556 dev_add_pack(&bpq_packet_type);
557
558 register_netdevice_notifier(&bpq_dev_notifier);
559
560 printk(banner);
561
562 return 0;
563 }
564
565 static void __exit bpq_cleanup_driver(void)
566 {
567 struct bpqdev *bpq;
568
569 dev_remove_pack(&bpq_packet_type);
570
571 unregister_netdevice_notifier(&bpq_dev_notifier);
572
573 remove_proc_entry("bpqether", init_net.proc_net);
574
575 rtnl_lock();
576 while (!list_empty(&bpq_devices)) {
577 bpq = list_entry(bpq_devices.next, struct bpqdev, bpq_list);
578 bpq_free_device(bpq->axdev);
579 }
580 rtnl_unlock();
581 }
582
583 MODULE_AUTHOR("Joerg Reuter DL1BKE <jreuter@yaina.de>");
584 MODULE_DESCRIPTION("Transmit and receive AX.25 packets over Ethernet");
585 MODULE_LICENSE("GPL");
586 module_init(bpq_init_driver);
587 module_exit(bpq_cleanup_driver);