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31#include <linux/module.h>
32#include <linux/kernel.h>
33#include <linux/types.h>
34#include <linux/fcntl.h>
35#include <linux/interrupt.h>
36#include <linux/ptrace.h>
37#include <linux/ioport.h>
38#include <linux/in.h>
39#include <linux/init.h>
40#include <linux/slab.h>
41#include <linux/string.h>
42#include <linux/errno.h>
43#include <linux/netdevice.h>
44#include <linux/skbuff.h>
45#include <linux/if_arp.h>
46#include <linux/if_frad.h>
47#include <linux/bitops.h>
48
49#include <net/sock.h>
50
51#include <asm/system.h>
52#include <asm/io.h>
53#include <asm/dma.h>
54#include <asm/uaccess.h>
55
56static const char version[] = "DLCI driver v0.35, 4 Jan 1997, mike.mclagan@linux.org";
57
58static LIST_HEAD(dlci_devs);
59
60static void dlci_setup(struct net_device *);
61
62
63
64
65
66
67
68static int dlci_header(struct sk_buff *skb, struct net_device *dev,
69 unsigned short type, const void *daddr,
70 const void *saddr, unsigned len)
71{
72 struct frhdr hdr;
73 struct dlci_local *dlp;
74 unsigned int hlen;
75 char *dest;
76
77 dlp = dev->priv;
78
79 hdr.control = FRAD_I_UI;
80 switch(type)
81 {
82 case ETH_P_IP:
83 hdr.IP_NLPID = FRAD_P_IP;
84 hlen = sizeof(hdr.control) + sizeof(hdr.IP_NLPID);
85 break;
86
87
88
89 default:
90 hdr.pad = FRAD_P_PADDING;
91 hdr.NLPID = FRAD_P_SNAP;
92 memset(hdr.OUI, 0, sizeof(hdr.OUI));
93 hdr.PID = htons(type);
94 hlen = sizeof(hdr);
95 break;
96 }
97
98 dest = skb_push(skb, hlen);
99 if (!dest)
100 return(0);
101
102 memcpy(dest, &hdr, hlen);
103
104 return(hlen);
105}
106
107static void dlci_receive(struct sk_buff *skb, struct net_device *dev)
108{
109 struct dlci_local *dlp;
110 struct frhdr *hdr;
111 int process, header;
112
113 dlp = dev->priv;
114 if (!pskb_may_pull(skb, sizeof(*hdr))) {
115 printk(KERN_NOTICE "%s: invalid data no header\n",
116 dev->name);
117 dlp->stats.rx_errors++;
118 kfree_skb(skb);
119 return;
120 }
121
122 hdr = (struct frhdr *) skb->data;
123 process = 0;
124 header = 0;
125 skb->dev = dev;
126
127 if (hdr->control != FRAD_I_UI)
128 {
129 printk(KERN_NOTICE "%s: Invalid header flag 0x%02X.\n", dev->name, hdr->control);
130 dlp->stats.rx_errors++;
131 }
132 else
133 switch(hdr->IP_NLPID)
134 {
135 case FRAD_P_PADDING:
136 if (hdr->NLPID != FRAD_P_SNAP)
137 {
138 printk(KERN_NOTICE "%s: Unsupported NLPID 0x%02X.\n", dev->name, hdr->NLPID);
139 dlp->stats.rx_errors++;
140 break;
141 }
142
143 if (hdr->OUI[0] + hdr->OUI[1] + hdr->OUI[2] != 0)
144 {
145 printk(KERN_NOTICE "%s: Unsupported organizationally unique identifier 0x%02X-%02X-%02X.\n", dev->name, hdr->OUI[0], hdr->OUI[1], hdr->OUI[2]);
146 dlp->stats.rx_errors++;
147 break;
148 }
149
150
151 header = sizeof(struct frhdr);
152
153 skb->protocol = hdr->PID;
154 process = 1;
155 break;
156
157 case FRAD_P_IP:
158 header = sizeof(hdr->control) + sizeof(hdr->IP_NLPID);
159 skb->protocol = htons(ETH_P_IP);
160 process = 1;
161 break;
162
163 case FRAD_P_SNAP:
164 case FRAD_P_Q933:
165 case FRAD_P_CLNP:
166 printk(KERN_NOTICE "%s: Unsupported NLPID 0x%02X.\n", dev->name, hdr->pad);
167 dlp->stats.rx_errors++;
168 break;
169
170 default:
171 printk(KERN_NOTICE "%s: Invalid pad byte 0x%02X.\n", dev->name, hdr->pad);
172 dlp->stats.rx_errors++;
173 break;
174 }
175
176 if (process)
177 {
178
179 skb_reset_mac_header(skb);
180 skb_pull(skb, header);
181 dlp->stats.rx_bytes += skb->len;
182 netif_rx(skb);
183 dlp->stats.rx_packets++;
184 dev->last_rx = jiffies;
185 }
186 else
187 dev_kfree_skb(skb);
188}
189
190static int dlci_transmit(struct sk_buff *skb, struct net_device *dev)
191{
192 struct dlci_local *dlp;
193 int ret;
194
195 ret = 0;
196
197 if (!skb || !dev)
198 return(0);
199
200 dlp = dev->priv;
201
202 netif_stop_queue(dev);
203
204 ret = dlp->slave->hard_start_xmit(skb, dlp->slave);
205 switch (ret)
206 {
207 case DLCI_RET_OK:
208 dlp->stats.tx_packets++;
209 ret = 0;
210 break;
211 case DLCI_RET_ERR:
212 dlp->stats.tx_errors++;
213 ret = 0;
214 break;
215 case DLCI_RET_DROP:
216 dlp->stats.tx_dropped++;
217 ret = 1;
218 break;
219 }
220
221
222
223 if (!ret)
224 {
225 dev_kfree_skb(skb);
226 netif_wake_queue(dev);
227 }
228 return(ret);
229}
230
231static int dlci_config(struct net_device *dev, struct dlci_conf __user *conf, int get)
232{
233 struct dlci_conf config;
234 struct dlci_local *dlp;
235 struct frad_local *flp;
236 int err;
237
238 dlp = dev->priv;
239
240 flp = dlp->slave->priv;
241
242 if (!get)
243 {
244 if(copy_from_user(&config, conf, sizeof(struct dlci_conf)))
245 return -EFAULT;
246 if (config.flags & ~DLCI_VALID_FLAGS)
247 return(-EINVAL);
248 memcpy(&dlp->config, &config, sizeof(struct dlci_conf));
249 dlp->configured = 1;
250 }
251
252 err = (*flp->dlci_conf)(dlp->slave, dev, get);
253 if (err)
254 return(err);
255
256 if (get)
257 {
258 if(copy_to_user(conf, &dlp->config, sizeof(struct dlci_conf)))
259 return -EFAULT;
260 }
261
262 return(0);
263}
264
265static int dlci_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
266{
267 struct dlci_local *dlp;
268
269 if (!capable(CAP_NET_ADMIN))
270 return(-EPERM);
271
272 dlp = dev->priv;
273
274 switch(cmd)
275 {
276 case DLCI_GET_SLAVE:
277 if (!*(short *)(dev->dev_addr))
278 return(-EINVAL);
279
280 strncpy(ifr->ifr_slave, dlp->slave->name, sizeof(ifr->ifr_slave));
281 break;
282
283 case DLCI_GET_CONF:
284 case DLCI_SET_CONF:
285 if (!*(short *)(dev->dev_addr))
286 return(-EINVAL);
287
288 return(dlci_config(dev, ifr->ifr_data, cmd == DLCI_GET_CONF));
289 break;
290
291 default:
292 return(-EOPNOTSUPP);
293 }
294 return(0);
295}
296
297static int dlci_change_mtu(struct net_device *dev, int new_mtu)
298{
299 struct dlci_local *dlp;
300
301 dlp = dev->priv;
302
303 return((*dlp->slave->change_mtu)(dlp->slave, new_mtu));
304}
305
306static int dlci_open(struct net_device *dev)
307{
308 struct dlci_local *dlp;
309 struct frad_local *flp;
310 int err;
311
312 dlp = dev->priv;
313
314 if (!*(short *)(dev->dev_addr))
315 return(-EINVAL);
316
317 if (!netif_running(dlp->slave))
318 return(-ENOTCONN);
319
320 flp = dlp->slave->priv;
321 err = (*flp->activate)(dlp->slave, dev);
322 if (err)
323 return(err);
324
325 netif_start_queue(dev);
326
327 return 0;
328}
329
330static int dlci_close(struct net_device *dev)
331{
332 struct dlci_local *dlp;
333 struct frad_local *flp;
334 int err;
335
336 netif_stop_queue(dev);
337
338 dlp = dev->priv;
339
340 flp = dlp->slave->priv;
341 err = (*flp->deactivate)(dlp->slave, dev);
342
343 return 0;
344}
345
346static struct net_device_stats *dlci_get_stats(struct net_device *dev)
347{
348 struct dlci_local *dlp;
349
350 dlp = dev->priv;
351
352 return(&dlp->stats);
353}
354
355static int dlci_add(struct dlci_add *dlci)
356{
357 struct net_device *master, *slave;
358 struct dlci_local *dlp;
359 struct frad_local *flp;
360 int err = -EINVAL;
361
362
363
364 slave = dev_get_by_name(&init_net, dlci->devname);
365 if (!slave)
366 return -ENODEV;
367
368 if (slave->type != ARPHRD_FRAD || slave->priv == NULL)
369 goto err1;
370
371
372 master = alloc_netdev( sizeof(struct dlci_local), "dlci%d",
373 dlci_setup);
374 if (!master) {
375 err = -ENOMEM;
376 goto err1;
377 }
378
379
380 rtnl_lock();
381 list_for_each_entry(dlp, &dlci_devs, list) {
382 if (dlp->slave == slave) {
383 err = -EBUSY;
384 goto err2;
385 }
386 }
387
388 err = dev_alloc_name(master, master->name);
389 if (err < 0)
390 goto err2;
391
392 *(short *)(master->dev_addr) = dlci->dlci;
393
394 dlp = (struct dlci_local *) master->priv;
395 dlp->slave = slave;
396 dlp->master = master;
397
398 flp = slave->priv;
399 err = (*flp->assoc)(slave, master);
400 if (err < 0)
401 goto err2;
402
403 err = register_netdevice(master);
404 if (err < 0)
405 goto err2;
406
407 strcpy(dlci->devname, master->name);
408
409 list_add(&dlp->list, &dlci_devs);
410 rtnl_unlock();
411
412 return(0);
413
414 err2:
415 rtnl_unlock();
416 free_netdev(master);
417 err1:
418 dev_put(slave);
419 return(err);
420}
421
422static int dlci_del(struct dlci_add *dlci)
423{
424 struct dlci_local *dlp;
425 struct frad_local *flp;
426 struct net_device *master, *slave;
427 int err;
428
429
430 master = __dev_get_by_name(&init_net, dlci->devname);
431 if (!master)
432 return(-ENODEV);
433
434 if (netif_running(master)) {
435 return(-EBUSY);
436 }
437
438 dlp = master->priv;
439 slave = dlp->slave;
440 flp = slave->priv;
441
442 rtnl_lock();
443 err = (*flp->deassoc)(slave, master);
444 if (!err) {
445 list_del(&dlp->list);
446
447 unregister_netdevice(master);
448
449 dev_put(slave);
450 }
451 rtnl_unlock();
452
453 return(err);
454}
455
456static int dlci_ioctl(unsigned int cmd, void __user *arg)
457{
458 struct dlci_add add;
459 int err;
460
461 if (!capable(CAP_NET_ADMIN))
462 return(-EPERM);
463
464 if(copy_from_user(&add, arg, sizeof(struct dlci_add)))
465 return -EFAULT;
466
467 switch (cmd)
468 {
469 case SIOCADDDLCI:
470 err = dlci_add(&add);
471
472 if (!err)
473 if(copy_to_user(arg, &add, sizeof(struct dlci_add)))
474 return -EFAULT;
475 break;
476
477 case SIOCDELDLCI:
478 err = dlci_del(&add);
479 break;
480
481 default:
482 err = -EINVAL;
483 }
484
485 return(err);
486}
487
488static const struct header_ops dlci_header_ops = {
489 .create = dlci_header,
490};
491
492static void dlci_setup(struct net_device *dev)
493{
494 struct dlci_local *dlp = dev->priv;
495
496 dev->flags = 0;
497 dev->open = dlci_open;
498 dev->stop = dlci_close;
499 dev->do_ioctl = dlci_dev_ioctl;
500 dev->hard_start_xmit = dlci_transmit;
501 dev->header_ops = &dlci_header_ops;
502 dev->get_stats = dlci_get_stats;
503 dev->change_mtu = dlci_change_mtu;
504 dev->destructor = free_netdev;
505
506 dlp->receive = dlci_receive;
507
508 dev->type = ARPHRD_DLCI;
509 dev->hard_header_len = sizeof(struct frhdr);
510 dev->addr_len = sizeof(short);
511
512}
513
514
515static int dlci_dev_event(struct notifier_block *unused,
516 unsigned long event, void *ptr)
517{
518 struct net_device *dev = (struct net_device *) ptr;
519
520 if (dev->nd_net != &init_net)
521 return NOTIFY_DONE;
522
523 if (event == NETDEV_UNREGISTER) {
524 struct dlci_local *dlp;
525
526 list_for_each_entry(dlp, &dlci_devs, list) {
527 if (dlp->slave == dev) {
528 list_del(&dlp->list);
529 unregister_netdevice(dlp->master);
530 dev_put(dlp->slave);
531 break;
532 }
533 }
534 }
535 return NOTIFY_DONE;
536}
537
538static struct notifier_block dlci_notifier = {
539 .notifier_call = dlci_dev_event,
540};
541
542static int __init init_dlci(void)
543{
544 dlci_ioctl_set(dlci_ioctl);
545 register_netdevice_notifier(&dlci_notifier);
546
547 printk("%s.\n", version);
548
549 return 0;
550}
551
552static void __exit dlci_exit(void)
553{
554 struct dlci_local *dlp, *nxt;
555
556 dlci_ioctl_set(NULL);
557 unregister_netdevice_notifier(&dlci_notifier);
558
559 rtnl_lock();
560 list_for_each_entry_safe(dlp, nxt, &dlci_devs, list) {
561 unregister_netdevice(dlp->master);
562 dev_put(dlp->slave);
563 }
564 rtnl_unlock();
565}
566
567module_init(init_dlci);
568module_exit(dlci_exit);
569
570MODULE_AUTHOR("Mike McLagan");
571MODULE_DESCRIPTION("Frame Relay DLCI layer");
572MODULE_LICENSE("GPL");
573
