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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/net/hamradio/bpqether.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/net/hamradio/bpqether.c')
-rw-r--r--drivers/net/hamradio/bpqether.c643
1 files changed, 643 insertions, 0 deletions
diff --git a/drivers/net/hamradio/bpqether.c b/drivers/net/hamradio/bpqether.c
new file mode 100644
index 000000000000..ef1a359e2273
--- /dev/null
+++ b/drivers/net/hamradio/bpqether.c
@@ -0,0 +1,643 @@
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
57#include <linux/config.h>
58#include <linux/errno.h>
59#include <linux/types.h>
60#include <linux/socket.h>
61#include <linux/in.h>
62#include <linux/kernel.h>
63#include <linux/string.h>
64#include <linux/net.h>
65#include <net/ax25.h>
66#include <linux/inet.h>
67#include <linux/netdevice.h>
68#include <linux/if_ether.h>
69#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>
87
88#include <linux/bpqether.h>
89
90static char banner[] __initdata = KERN_INFO "AX.25: bpqether driver version 004\n";
91
92static unsigned char ax25_bcast[AX25_ADDR_LEN] =
93 {'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, '0' << 1};
94static unsigned char ax25_defaddr[AX25_ADDR_LEN] =
95 {'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, '1' << 1};
96
97static char bcast_addr[6]={0xFF,0xFF,0xFF,0xFF,0xFF,0xFF};
98
99static char bpq_eth_addr[6];
100
101static int bpq_rcv(struct sk_buff *, struct net_device *, struct packet_type *);
102static int bpq_device_event(struct notifier_block *, unsigned long, void *);
103static const char *bpq_print_ethaddr(const unsigned char *);
104
105static struct packet_type bpq_packet_type = {
106 .type = __constant_htons(ETH_P_BPQ),
107 .func = bpq_rcv,
108};
109
110static struct notifier_block bpq_dev_notifier = {
111 .notifier_call =bpq_device_event,
112};
113
114
115struct bpqdev {
116 struct list_head bpq_list; /* list of bpq devices chain */
117 struct net_device *ethdev; /* link to ethernet device */
118 struct net_device *axdev; /* bpq device (bpq#) */
119 struct net_device_stats stats; /* some statistics */
120 char dest_addr[6]; /* ether destination address */
121 char acpt_addr[6]; /* accept ether frames from this address only */
122};
123
124static LIST_HEAD(bpq_devices);
125
126
127/* ------------------------------------------------------------------------ */
128
129
130/*
131 * Get the ethernet device for a BPQ device
132 */
133static inline struct net_device *bpq_get_ether_dev(struct net_device *dev)
134{
135 struct bpqdev *bpq = netdev_priv(dev);
136
137 return bpq ? bpq->ethdev : NULL;
138}
139
140/*
141 * Get the BPQ device for the ethernet device
142 */
143static inline struct net_device *bpq_get_ax25_dev(struct net_device *dev)
144{
145 struct bpqdev *bpq;
146
147 list_for_each_entry(bpq, &bpq_devices, bpq_list) {
148 if (bpq->ethdev == dev)
149 return bpq->axdev;
150 }
151 return NULL;
152}
153
154static inline int dev_is_ethdev(struct net_device *dev)
155{
156 return (
157 dev->type == ARPHRD_ETHER
158 && strncmp(dev->name, "dummy", 5)
159 );
160}
161
162/* ------------------------------------------------------------------------ */
163
164
165/*
166 * Receive an AX.25 frame via an ethernet interface.
167 */
168static int bpq_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *ptype)
169{
170 int len;
171 char * ptr;
172 struct ethhdr *eth;
173 struct bpqdev *bpq;
174
175 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
176 return NET_RX_DROP;
177
178 if (!pskb_may_pull(skb, sizeof(struct ethhdr)))
179 goto drop;
180
181 rcu_read_lock();
182 dev = bpq_get_ax25_dev(dev);
183
184 if (dev == NULL || !netif_running(dev))
185 goto drop_unlock;
186
187 /*
188 * if we want to accept frames from just one ethernet device
189 * we check the source address of the sender.
190 */
191
192 bpq = netdev_priv(dev);
193
194 eth = eth_hdr(skb);
195
196 if (!(bpq->acpt_addr[0] & 0x01) &&
197 memcmp(eth->h_source, bpq->acpt_addr, ETH_ALEN))
198 goto drop_unlock;
199
200 if (skb_cow(skb, sizeof(struct ethhdr)))
201 goto drop_unlock;
202
203 len = skb->data[0] + skb->data[1] * 256 - 5;
204
205 skb_pull(skb, 2); /* Remove the length bytes */
206 skb_trim(skb, len); /* Set the length of the data */
207
208 bpq->stats.rx_packets++;
209 bpq->stats.rx_bytes += len;
210
211 ptr = skb_push(skb, 1);
212 *ptr = 0;
213
214 skb->dev = dev;
215 skb->protocol = htons(ETH_P_AX25);
216 skb->mac.raw = skb->data;
217 skb->pkt_type = PACKET_HOST;
218
219 netif_rx(skb);
220 dev->last_rx = jiffies;
221unlock:
222
223 rcu_read_unlock();
224
225 return 0;
226drop_unlock:
227 kfree_skb(skb);
228 goto unlock;
229
230drop:
231 kfree_skb(skb);
232 return 0;
233}
234
235/*
236 * Send an AX.25 frame via an ethernet interface
237 */
238static int bpq_xmit(struct sk_buff *skb, struct net_device *dev)
239{
240 struct sk_buff *newskb;
241 unsigned char *ptr;
242 struct bpqdev *bpq;
243 int size;
244
245 /*
246 * Just to be *really* sure not to send anything if the interface
247 * is down, the ethernet device may have gone.
248 */
249 if (!netif_running(dev)) {
250 kfree_skb(skb);
251 return -ENODEV;
252 }
253
254 skb_pull(skb, 1);
255 size = skb->len;
256
257 /*
258 * The AX.25 code leaves enough room for the ethernet header, but
259 * sendto() does not.
260 */
261 if (skb_headroom(skb) < AX25_BPQ_HEADER_LEN) { /* Ough! */
262 if ((newskb = skb_realloc_headroom(skb, AX25_BPQ_HEADER_LEN)) == NULL) {
263 printk(KERN_WARNING "bpqether: out of memory\n");
264 kfree_skb(skb);
265 return -ENOMEM;
266 }
267
268 if (skb->sk != NULL)
269 skb_set_owner_w(newskb, skb->sk);
270
271 kfree_skb(skb);
272 skb = newskb;
273 }
274
275 skb->protocol = htons(ETH_P_AX25);
276
277 ptr = skb_push(skb, 2);
278
279 *ptr++ = (size + 5) % 256;
280 *ptr++ = (size + 5) / 256;
281
282 bpq = netdev_priv(dev);
283
284 if ((dev = bpq_get_ether_dev(dev)) == NULL) {
285 bpq->stats.tx_dropped++;
286 kfree_skb(skb);
287 return -ENODEV;
288 }
289
290 skb->dev = dev;
291 skb->nh.raw = skb->data;
292 dev->hard_header(skb, dev, ETH_P_BPQ, bpq->dest_addr, NULL, 0);
293 bpq->stats.tx_packets++;
294 bpq->stats.tx_bytes+=skb->len;
295
296 dev_queue_xmit(skb);
297 netif_wake_queue(dev);
298 return 0;
299}
300
301/*
302 * Statistics
303 */
304static struct net_device_stats *bpq_get_stats(struct net_device *dev)
305{
306 struct bpqdev *bpq = netdev_priv(dev);
307
308 return &bpq->stats;
309}
310
311/*
312 * Set AX.25 callsign
313 */
314static int bpq_set_mac_address(struct net_device *dev, void *addr)
315{
316 struct sockaddr *sa = (struct sockaddr *)addr;
317
318 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
319
320 return 0;
321}
322
323/* Ioctl commands
324 *
325 * SIOCSBPQETHOPT reserved for enhancements
326 * SIOCSBPQETHADDR set the destination and accepted
327 * source ethernet address (broadcast
328 * or multicast: accept all)
329 */
330static int bpq_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
331{
332 struct bpq_ethaddr __user *ethaddr = ifr->ifr_data;
333 struct bpqdev *bpq = netdev_priv(dev);
334 struct bpq_req req;
335
336 if (!capable(CAP_NET_ADMIN))
337 return -EPERM;
338
339 switch (cmd) {
340 case SIOCSBPQETHOPT:
341 if (copy_from_user(&req, ifr->ifr_data, sizeof(struct bpq_req)))
342 return -EFAULT;
343 switch (req.cmd) {
344 case SIOCGBPQETHPARAM:
345 case SIOCSBPQETHPARAM:
346 default:
347 return -EINVAL;
348 }
349
350 break;
351
352 case SIOCSBPQETHADDR:
353 if (copy_from_user(bpq->dest_addr, ethaddr->destination, ETH_ALEN))
354 return -EFAULT;
355 if (copy_from_user(bpq->acpt_addr, ethaddr->accept, ETH_ALEN))
356 return -EFAULT;
357 break;
358
359 default:
360 return -EINVAL;
361 }
362
363 return 0;
364}
365
366/*
367 * open/close a device
368 */
369static int bpq_open(struct net_device *dev)
370{
371 netif_start_queue(dev);
372 return 0;
373}
374
375static int bpq_close(struct net_device *dev)
376{
377 netif_stop_queue(dev);
378 return 0;
379}
380
381
382/* ------------------------------------------------------------------------ */
383
384
385/*
386 * Proc filesystem
387 */
388static const char * bpq_print_ethaddr(const unsigned char *e)
389{
390 static char buf[18];
391
392 sprintf(buf, "%2.2X:%2.2X:%2.2X:%2.2X:%2.2X:%2.2X",
393 e[0], e[1], e[2], e[3], e[4], e[5]);
394
395 return buf;
396}
397
398static void *bpq_seq_start(struct seq_file *seq, loff_t *pos)
399{
400 int i = 1;
401 struct bpqdev *bpqdev;
402
403 rcu_read_lock();
404
405 if (*pos == 0)
406 return SEQ_START_TOKEN;
407
408 list_for_each_entry(bpqdev, &bpq_devices, bpq_list) {
409 if (i == *pos)
410 return bpqdev;
411 }
412 return NULL;
413}
414
415static void *bpq_seq_next(struct seq_file *seq, void *v, loff_t *pos)
416{
417 struct list_head *p;
418
419 ++*pos;
420
421 if (v == SEQ_START_TOKEN)
422 p = bpq_devices.next;
423 else
424 p = ((struct bpqdev *)v)->bpq_list.next;
425
426 return (p == &bpq_devices) ? NULL
427 : list_entry(p, struct bpqdev, bpq_list);
428}
429
430static void bpq_seq_stop(struct seq_file *seq, void *v)
431{
432 rcu_read_unlock();
433}
434
435
436static int bpq_seq_show(struct seq_file *seq, void *v)
437{
438 if (v == SEQ_START_TOKEN)
439 seq_puts(seq,
440 "dev ether destination accept from\n");
441 else {
442 const struct bpqdev *bpqdev = v;
443
444 seq_printf(seq, "%-5s %-10s %s ",
445 bpqdev->axdev->name, bpqdev->ethdev->name,
446 bpq_print_ethaddr(bpqdev->dest_addr));
447
448 seq_printf(seq, "%s\n",
449 (bpqdev->acpt_addr[0] & 0x01) ? "*"
450 : bpq_print_ethaddr(bpqdev->acpt_addr));
451
452 }
453 return 0;
454}
455
456static struct seq_operations bpq_seqops = {
457 .start = bpq_seq_start,
458 .next = bpq_seq_next,
459 .stop = bpq_seq_stop,
460 .show = bpq_seq_show,
461};
462
463static int bpq_info_open(struct inode *inode, struct file *file)
464{
465 return seq_open(file, &bpq_seqops);
466}
467
468static struct file_operations bpq_info_fops = {
469 .owner = THIS_MODULE,
470 .open = bpq_info_open,
471 .read = seq_read,
472 .llseek = seq_lseek,
473 .release = seq_release,
474};
475
476
477/* ------------------------------------------------------------------------ */
478
479
480static void bpq_setup(struct net_device *dev)
481{
482
483 dev->hard_start_xmit = bpq_xmit;
484 dev->open = bpq_open;
485 dev->stop = bpq_close;
486 dev->set_mac_address = bpq_set_mac_address;
487 dev->get_stats = bpq_get_stats;
488 dev->do_ioctl = bpq_ioctl;
489 dev->destructor = free_netdev;
490
491 memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN);
492 memcpy(dev->dev_addr, ax25_defaddr, AX25_ADDR_LEN);
493
494 dev->flags = 0;
495
496#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
497 dev->hard_header = ax25_encapsulate;
498 dev->rebuild_header = ax25_rebuild_header;
499#endif
500
501 dev->type = ARPHRD_AX25;
502 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
503 dev->mtu = AX25_DEF_PACLEN;
504 dev->addr_len = AX25_ADDR_LEN;
505
506}
507
508/*
509 * Setup a new device.
510 */
511static int bpq_new_device(struct net_device *edev)
512{
513 int err;
514 struct net_device *ndev;
515 struct bpqdev *bpq;
516
517 ndev = alloc_netdev(sizeof(struct bpqdev), "bpq%d",
518 bpq_setup);
519 if (!ndev)
520 return -ENOMEM;
521
522
523 bpq = netdev_priv(ndev);
524 dev_hold(edev);
525 bpq->ethdev = edev;
526 bpq->axdev = ndev;
527
528 memcpy(bpq->dest_addr, bcast_addr, sizeof(bpq_eth_addr));
529 memcpy(bpq->acpt_addr, bcast_addr, sizeof(bpq_eth_addr));
530
531 err = dev_alloc_name(ndev, ndev->name);
532 if (err < 0)
533 goto error;
534
535 err = register_netdevice(ndev);
536 if (err)
537 goto error;
538
539 /* List protected by RTNL */
540 list_add_rcu(&bpq->bpq_list, &bpq_devices);
541 return 0;
542
543 error:
544 dev_put(edev);
545 free_netdev(ndev);
546 return err;
547
548}
549
550static void bpq_free_device(struct net_device *ndev)
551{
552 struct bpqdev *bpq = netdev_priv(ndev);
553
554 dev_put(bpq->ethdev);
555 list_del_rcu(&bpq->bpq_list);
556
557 unregister_netdevice(ndev);
558}
559
560/*
561 * Handle device status changes.
562 */
563static int bpq_device_event(struct notifier_block *this,unsigned long event, void *ptr)
564{
565 struct net_device *dev = (struct net_device *)ptr;
566
567 if (!dev_is_ethdev(dev))
568 return NOTIFY_DONE;
569
570 rcu_read_lock();
571
572 switch (event) {
573 case NETDEV_UP: /* new ethernet device -> new BPQ interface */
574 if (bpq_get_ax25_dev(dev) == NULL)
575 bpq_new_device(dev);
576 break;
577
578 case NETDEV_DOWN: /* ethernet device closed -> close BPQ interface */
579 if ((dev = bpq_get_ax25_dev(dev)) != NULL)
580 dev_close(dev);
581 break;
582
583 case NETDEV_UNREGISTER: /* ethernet device removed -> free BPQ interface */
584 if ((dev = bpq_get_ax25_dev(dev)) != NULL)
585 bpq_free_device(dev);
586 break;
587 default:
588 break;
589 }
590 rcu_read_unlock();
591
592 return NOTIFY_DONE;
593}
594
595
596/* ------------------------------------------------------------------------ */
597
598/*
599 * Initialize driver. To be called from af_ax25 if not compiled as a
600 * module
601 */
602static int __init bpq_init_driver(void)
603{
604#ifdef CONFIG_PROC_FS
605 if (!proc_net_fops_create("bpqether", S_IRUGO, &bpq_info_fops)) {
606 printk(KERN_ERR
607 "bpq: cannot create /proc/net/bpqether entry.\n");
608 return -ENOENT;
609 }
610#endif /* CONFIG_PROC_FS */
611
612 dev_add_pack(&bpq_packet_type);
613
614 register_netdevice_notifier(&bpq_dev_notifier);
615
616 printk(banner);
617
618 return 0;
619}
620
621static void __exit bpq_cleanup_driver(void)
622{
623 struct bpqdev *bpq;
624
625 dev_remove_pack(&bpq_packet_type);
626
627 unregister_netdevice_notifier(&bpq_dev_notifier);
628
629 proc_net_remove("bpqether");
630
631 rtnl_lock();
632 while (!list_empty(&bpq_devices)) {
633 bpq = list_entry(bpq_devices.next, struct bpqdev, bpq_list);
634 bpq_free_device(bpq->axdev);
635 }
636 rtnl_unlock();
637}
638
639MODULE_AUTHOR("Joerg Reuter DL1BKE <jreuter@yaina.de>");
640MODULE_DESCRIPTION("Transmit and receive AX.25 packets over Ethernet");
641MODULE_LICENSE("GPL");
642module_init(bpq_init_driver);
643module_exit(bpq_cleanup_driver);