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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/wan/dlci.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/wan/dlci.c')
-rw-r--r--drivers/net/wan/dlci.c566
1 files changed, 566 insertions, 0 deletions
diff --git a/drivers/net/wan/dlci.c b/drivers/net/wan/dlci.c
new file mode 100644
index 000000000000..6e1ec5bf22fc
--- /dev/null
+++ b/drivers/net/wan/dlci.c
@@ -0,0 +1,566 @@
1/*
2 * DLCI Implementation of Frame Relay protocol for Linux, according to
3 * RFC 1490. This generic device provides en/decapsulation for an
4 * underlying hardware driver. Routes & IPs are assigned to these
5 * interfaces. Requires 'dlcicfg' program to create usable
6 * interfaces, the initial one, 'dlci' is for IOCTL use only.
7 *
8 * Version: @(#)dlci.c 0.35 4 Jan 1997
9 *
10 * Author: Mike McLagan <mike.mclagan@linux.org>
11 *
12 * Changes:
13 *
14 * 0.15 Mike Mclagan Packet freeing, bug in kmalloc call
15 * DLCI_RET handling
16 * 0.20 Mike McLagan More conservative on which packets
17 * are returned for retry and which are
18 * are dropped. If DLCI_RET_DROP is
19 * returned from the FRAD, the packet is
20 * sent back to Linux for re-transmission
21 * 0.25 Mike McLagan Converted to use SIOC IOCTL calls
22 * 0.30 Jim Freeman Fixed to allow IPX traffic
23 * 0.35 Michael Elizabeth Fixed incorrect memcpy_fromfs
24 *
25 * This program is free software; you can redistribute it and/or
26 * modify it under the terms of the GNU General Public License
27 * as published by the Free Software Foundation; either version
28 * 2 of the License, or (at your option) any later version.
29 */
30
31#include <linux/config.h> /* for CONFIG_DLCI_COUNT */
32#include <linux/module.h>
33#include <linux/kernel.h>
34#include <linux/types.h>
35#include <linux/fcntl.h>
36#include <linux/interrupt.h>
37#include <linux/ptrace.h>
38#include <linux/ioport.h>
39#include <linux/in.h>
40#include <linux/init.h>
41#include <linux/slab.h>
42#include <linux/string.h>
43#include <linux/errno.h>
44#include <linux/netdevice.h>
45#include <linux/skbuff.h>
46#include <linux/if_arp.h>
47#include <linux/if_frad.h>
48#include <linux/bitops.h>
49
50#include <net/sock.h>
51
52#include <asm/system.h>
53#include <asm/io.h>
54#include <asm/dma.h>
55#include <asm/uaccess.h>
56
57static const char version[] = "DLCI driver v0.35, 4 Jan 1997, mike.mclagan@linux.org";
58
59static LIST_HEAD(dlci_devs);
60
61static void dlci_setup(struct net_device *);
62
63/*
64 * these encapsulate the RFC 1490 requirements as well as
65 * deal with packet transmission and reception, working with
66 * the upper network layers
67 */
68
69static int dlci_header(struct sk_buff *skb, struct net_device *dev,
70 unsigned short type, void *daddr, void *saddr,
71 unsigned len)
72{
73 struct frhdr hdr;
74 struct dlci_local *dlp;
75 unsigned int hlen;
76 char *dest;
77
78 dlp = dev->priv;
79
80 hdr.control = FRAD_I_UI;
81 switch(type)
82 {
83 case ETH_P_IP:
84 hdr.IP_NLPID = FRAD_P_IP;
85 hlen = sizeof(hdr.control) + sizeof(hdr.IP_NLPID);
86 break;
87
88 /* feel free to add other types, if necessary */
89
90 default:
91 hdr.pad = FRAD_P_PADDING;
92 hdr.NLPID = FRAD_P_SNAP;
93 memset(hdr.OUI, 0, sizeof(hdr.OUI));
94 hdr.PID = htons(type);
95 hlen = sizeof(hdr);
96 break;
97 }
98
99 dest = skb_push(skb, hlen);
100 if (!dest)
101 return(0);
102
103 memcpy(dest, &hdr, hlen);
104
105 return(hlen);
106}
107
108static void dlci_receive(struct sk_buff *skb, struct net_device *dev)
109{
110 struct dlci_local *dlp;
111 struct frhdr *hdr;
112 int process, header;
113
114 dlp = dev->priv;
115 if (!pskb_may_pull(skb, sizeof(*hdr))) {
116 printk(KERN_NOTICE "%s: invalid data no header\n",
117 dev->name);
118 dlp->stats.rx_errors++;
119 kfree_skb(skb);
120 return;
121 }
122
123 hdr = (struct frhdr *) skb->data;
124 process = 0;
125 header = 0;
126 skb->dev = dev;
127
128 if (hdr->control != FRAD_I_UI)
129 {
130 printk(KERN_NOTICE "%s: Invalid header flag 0x%02X.\n", dev->name, hdr->control);
131 dlp->stats.rx_errors++;
132 }
133 else
134 switch(hdr->IP_NLPID)
135 {
136 case FRAD_P_PADDING:
137 if (hdr->NLPID != FRAD_P_SNAP)
138 {
139 printk(KERN_NOTICE "%s: Unsupported NLPID 0x%02X.\n", dev->name, hdr->NLPID);
140 dlp->stats.rx_errors++;
141 break;
142 }
143
144 if (hdr->OUI[0] + hdr->OUI[1] + hdr->OUI[2] != 0)
145 {
146 printk(KERN_NOTICE "%s: Unsupported organizationally unique identifier 0x%02X-%02X-%02X.\n", dev->name, hdr->OUI[0], hdr->OUI[1], hdr->OUI[2]);
147 dlp->stats.rx_errors++;
148 break;
149 }
150
151 /* at this point, it's an EtherType frame */
152 header = sizeof(struct frhdr);
153 /* Already in network order ! */
154 skb->protocol = hdr->PID;
155 process = 1;
156 break;
157
158 case FRAD_P_IP:
159 header = sizeof(hdr->control) + sizeof(hdr->IP_NLPID);
160 skb->protocol = htons(ETH_P_IP);
161 process = 1;
162 break;
163
164 case FRAD_P_SNAP:
165 case FRAD_P_Q933:
166 case FRAD_P_CLNP:
167 printk(KERN_NOTICE "%s: Unsupported NLPID 0x%02X.\n", dev->name, hdr->pad);
168 dlp->stats.rx_errors++;
169 break;
170
171 default:
172 printk(KERN_NOTICE "%s: Invalid pad byte 0x%02X.\n", dev->name, hdr->pad);
173 dlp->stats.rx_errors++;
174 break;
175 }
176
177 if (process)
178 {
179 /* we've set up the protocol, so discard the header */
180 skb->mac.raw = skb->data;
181 skb_pull(skb, header);
182 dlp->stats.rx_bytes += skb->len;
183 netif_rx(skb);
184 dlp->stats.rx_packets++;
185 dev->last_rx = jiffies;
186 }
187 else
188 dev_kfree_skb(skb);
189}
190
191static int dlci_transmit(struct sk_buff *skb, struct net_device *dev)
192{
193 struct dlci_local *dlp;
194 int ret;
195
196 ret = 0;
197
198 if (!skb || !dev)
199 return(0);
200
201 dlp = dev->priv;
202
203 netif_stop_queue(dev);
204
205 ret = dlp->slave->hard_start_xmit(skb, dlp->slave);
206 switch (ret)
207 {
208 case DLCI_RET_OK:
209 dlp->stats.tx_packets++;
210 ret = 0;
211 break;
212 case DLCI_RET_ERR:
213 dlp->stats.tx_errors++;
214 ret = 0;
215 break;
216 case DLCI_RET_DROP:
217 dlp->stats.tx_dropped++;
218 ret = 1;
219 break;
220 }
221 /* Alan Cox recommends always returning 0, and always freeing the packet */
222 /* experience suggest a slightly more conservative approach */
223
224 if (!ret)
225 {
226 dev_kfree_skb(skb);
227 netif_wake_queue(dev);
228 }
229 return(ret);
230}
231
232static int dlci_config(struct net_device *dev, struct dlci_conf __user *conf, int get)
233{
234 struct dlci_conf config;
235 struct dlci_local *dlp;
236 struct frad_local *flp;
237 int err;
238
239 dlp = dev->priv;
240
241 flp = dlp->slave->priv;
242
243 if (!get)
244 {
245 if(copy_from_user(&config, conf, sizeof(struct dlci_conf)))
246 return -EFAULT;
247 if (config.flags & ~DLCI_VALID_FLAGS)
248 return(-EINVAL);
249 memcpy(&dlp->config, &config, sizeof(struct dlci_conf));
250 dlp->configured = 1;
251 }
252
253 err = (*flp->dlci_conf)(dlp->slave, dev, get);
254 if (err)
255 return(err);
256
257 if (get)
258 {
259 if(copy_to_user(conf, &dlp->config, sizeof(struct dlci_conf)))
260 return -EFAULT;
261 }
262
263 return(0);
264}
265
266static int dlci_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
267{
268 struct dlci_local *dlp;
269
270 if (!capable(CAP_NET_ADMIN))
271 return(-EPERM);
272
273 dlp = dev->priv;
274
275 switch(cmd)
276 {
277 case DLCI_GET_SLAVE:
278 if (!*(short *)(dev->dev_addr))
279 return(-EINVAL);
280
281 strncpy(ifr->ifr_slave, dlp->slave->name, sizeof(ifr->ifr_slave));
282 break;
283
284 case DLCI_GET_CONF:
285 case DLCI_SET_CONF:
286 if (!*(short *)(dev->dev_addr))
287 return(-EINVAL);
288
289 return(dlci_config(dev, ifr->ifr_data, cmd == DLCI_GET_CONF));
290 break;
291
292 default:
293 return(-EOPNOTSUPP);
294 }
295 return(0);
296}
297
298static int dlci_change_mtu(struct net_device *dev, int new_mtu)
299{
300 struct dlci_local *dlp;
301
302 dlp = dev->priv;
303
304 return((*dlp->slave->change_mtu)(dlp->slave, new_mtu));
305}
306
307static int dlci_open(struct net_device *dev)
308{
309 struct dlci_local *dlp;
310 struct frad_local *flp;
311 int err;
312
313 dlp = dev->priv;
314
315 if (!*(short *)(dev->dev_addr))
316 return(-EINVAL);
317
318 if (!netif_running(dlp->slave))
319 return(-ENOTCONN);
320
321 flp = dlp->slave->priv;
322 err = (*flp->activate)(dlp->slave, dev);
323 if (err)
324 return(err);
325
326 netif_start_queue(dev);
327
328 return 0;
329}
330
331static int dlci_close(struct net_device *dev)
332{
333 struct dlci_local *dlp;
334 struct frad_local *flp;
335 int err;
336
337 netif_stop_queue(dev);
338
339 dlp = dev->priv;
340
341 flp = dlp->slave->priv;
342 err = (*flp->deactivate)(dlp->slave, dev);
343
344 return 0;
345}
346
347static struct net_device_stats *dlci_get_stats(struct net_device *dev)
348{
349 struct dlci_local *dlp;
350
351 dlp = dev->priv;
352
353 return(&dlp->stats);
354}
355
356static int dlci_add(struct dlci_add *dlci)
357{
358 struct net_device *master, *slave;
359 struct dlci_local *dlp;
360 struct frad_local *flp;
361 int err = -EINVAL;
362
363
364 /* validate slave device */
365 slave = dev_get_by_name(dlci->devname);
366 if (!slave)
367 return -ENODEV;
368
369 if (slave->type != ARPHRD_FRAD || slave->priv == NULL)
370 goto err1;
371
372 /* create device name */
373 master = alloc_netdev( sizeof(struct dlci_local), "dlci%d",
374 dlci_setup);
375 if (!master) {
376 err = -ENOMEM;
377 goto err1;
378 }
379
380 /* make sure same slave not already registered */
381 rtnl_lock();
382 list_for_each_entry(dlp, &dlci_devs, list) {
383 if (dlp->slave == slave) {
384 err = -EBUSY;
385 goto err2;
386 }
387 }
388
389 err = dev_alloc_name(master, master->name);
390 if (err < 0)
391 goto err2;
392
393 *(short *)(master->dev_addr) = dlci->dlci;
394
395 dlp = (struct dlci_local *) master->priv;
396 dlp->slave = slave;
397 dlp->master = master;
398
399 flp = slave->priv;
400 err = (*flp->assoc)(slave, master);
401 if (err < 0)
402 goto err2;
403
404 err = register_netdevice(master);
405 if (err < 0)
406 goto err2;
407
408 strcpy(dlci->devname, master->name);
409
410 list_add(&dlp->list, &dlci_devs);
411 rtnl_unlock();
412
413 return(0);
414
415 err2:
416 rtnl_unlock();
417 free_netdev(master);
418 err1:
419 dev_put(slave);
420 return(err);
421}
422
423static int dlci_del(struct dlci_add *dlci)
424{
425 struct dlci_local *dlp;
426 struct frad_local *flp;
427 struct net_device *master, *slave;
428 int err;
429
430 /* validate slave device */
431 master = __dev_get_by_name(dlci->devname);
432 if (!master)
433 return(-ENODEV);
434
435 if (netif_running(master)) {
436 return(-EBUSY);
437 }
438
439 dlp = master->priv;
440 slave = dlp->slave;
441 flp = slave->priv;
442
443 rtnl_lock();
444 err = (*flp->deassoc)(slave, master);
445 if (!err) {
446 list_del(&dlp->list);
447
448 unregister_netdevice(master);
449
450 dev_put(slave);
451 }
452 rtnl_unlock();
453
454 return(err);
455}
456
457static int dlci_ioctl(unsigned int cmd, void __user *arg)
458{
459 struct dlci_add add;
460 int err;
461
462 if (!capable(CAP_NET_ADMIN))
463 return(-EPERM);
464
465 if(copy_from_user(&add, arg, sizeof(struct dlci_add)))
466 return -EFAULT;
467
468 switch (cmd)
469 {
470 case SIOCADDDLCI:
471 err = dlci_add(&add);
472
473 if (!err)
474 if(copy_to_user(arg, &add, sizeof(struct dlci_add)))
475 return -EFAULT;
476 break;
477
478 case SIOCDELDLCI:
479 err = dlci_del(&add);
480 break;
481
482 default:
483 err = -EINVAL;
484 }
485
486 return(err);
487}
488
489static void dlci_setup(struct net_device *dev)
490{
491 struct dlci_local *dlp = dev->priv;
492
493 dev->flags = 0;
494 dev->open = dlci_open;
495 dev->stop = dlci_close;
496 dev->do_ioctl = dlci_dev_ioctl;
497 dev->hard_start_xmit = dlci_transmit;
498 dev->hard_header = dlci_header;
499 dev->get_stats = dlci_get_stats;
500 dev->change_mtu = dlci_change_mtu;
501 dev->destructor = free_netdev;
502
503 dlp->receive = dlci_receive;
504
505 dev->type = ARPHRD_DLCI;
506 dev->hard_header_len = sizeof(struct frhdr);
507 dev->addr_len = sizeof(short);
508
509}
510
511/* if slave is unregistering, then cleanup master */
512static int dlci_dev_event(struct notifier_block *unused,
513 unsigned long event, void *ptr)
514{
515 struct net_device *dev = (struct net_device *) ptr;
516
517 if (event == NETDEV_UNREGISTER) {
518 struct dlci_local *dlp;
519
520 list_for_each_entry(dlp, &dlci_devs, list) {
521 if (dlp->slave == dev) {
522 list_del(&dlp->list);
523 unregister_netdevice(dlp->master);
524 dev_put(dlp->slave);
525 break;
526 }
527 }
528 }
529 return NOTIFY_DONE;
530}
531
532static struct notifier_block dlci_notifier = {
533 .notifier_call = dlci_dev_event,
534};
535
536static int __init init_dlci(void)
537{
538 dlci_ioctl_set(dlci_ioctl);
539 register_netdevice_notifier(&dlci_notifier);
540
541 printk("%s.\n", version);
542
543 return 0;
544}
545
546static void __exit dlci_exit(void)
547{
548 struct dlci_local *dlp, *nxt;
549
550 dlci_ioctl_set(NULL);
551 unregister_netdevice_notifier(&dlci_notifier);
552
553 rtnl_lock();
554 list_for_each_entry_safe(dlp, nxt, &dlci_devs, list) {
555 unregister_netdevice(dlp->master);
556 dev_put(dlp->slave);
557 }
558 rtnl_unlock();
559}
560
561module_init(init_dlci);
562module_exit(dlci_exit);
563
564MODULE_AUTHOR("Mike McLagan");
565MODULE_DESCRIPTION("Frame Relay DLCI layer");
566MODULE_LICENSE("GPL");