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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 = netdev_priv(dev);
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 = netdev_priv(dev);
114 if (!pskb_may_pull(skb, sizeof(*hdr))) {
115 printk(KERN_NOTICE "%s: invalid data no header\n",
116 dev->name);
117 dev->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 dev->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 dev->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 dev->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 dev->stats.rx_errors++;
168 break;
169
170 default:
171 printk(KERN_NOTICE "%s: Invalid pad byte 0x%02X.\n", dev->name, hdr->pad);
172 dev->stats.rx_errors++;
173 break;
174 }
175
176 if (process)
177 {
178
179 skb_reset_mac_header(skb);
180 skb_pull(skb, header);
181 dev->stats.rx_bytes += skb->len;
182 netif_rx(skb);
183 dev->stats.rx_packets++;
184 }
185 else
186 dev_kfree_skb(skb);
187}
188
189static netdev_tx_t dlci_transmit(struct sk_buff *skb, struct net_device *dev)
190{
191 struct dlci_local *dlp = netdev_priv(dev);
192
193 if (skb)
194 dlp->slave->netdev_ops->ndo_start_xmit(skb, dlp->slave);
195 return NETDEV_TX_OK;
196}
197
198static int dlci_config(struct net_device *dev, struct dlci_conf __user *conf, int get)
199{
200 struct dlci_conf config;
201 struct dlci_local *dlp;
202 struct frad_local *flp;
203 int err;
204
205 dlp = netdev_priv(dev);
206
207 flp = netdev_priv(dlp->slave);
208
209 if (!get)
210 {
211 if(copy_from_user(&config, conf, sizeof(struct dlci_conf)))
212 return -EFAULT;
213 if (config.flags & ~DLCI_VALID_FLAGS)
214 return(-EINVAL);
215 memcpy(&dlp->config, &config, sizeof(struct dlci_conf));
216 dlp->configured = 1;
217 }
218
219 err = (*flp->dlci_conf)(dlp->slave, dev, get);
220 if (err)
221 return(err);
222
223 if (get)
224 {
225 if(copy_to_user(conf, &dlp->config, sizeof(struct dlci_conf)))
226 return -EFAULT;
227 }
228
229 return(0);
230}
231
232static int dlci_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
233{
234 struct dlci_local *dlp;
235
236 if (!capable(CAP_NET_ADMIN))
237 return(-EPERM);
238
239 dlp = netdev_priv(dev);
240
241 switch(cmd)
242 {
243 case DLCI_GET_SLAVE:
244 if (!*(short *)(dev->dev_addr))
245 return(-EINVAL);
246
247 strncpy(ifr->ifr_slave, dlp->slave->name, sizeof(ifr->ifr_slave));
248 break;
249
250 case DLCI_GET_CONF:
251 case DLCI_SET_CONF:
252 if (!*(short *)(dev->dev_addr))
253 return(-EINVAL);
254
255 return(dlci_config(dev, ifr->ifr_data, cmd == DLCI_GET_CONF));
256 break;
257
258 default:
259 return(-EOPNOTSUPP);
260 }
261 return(0);
262}
263
264static int dlci_change_mtu(struct net_device *dev, int new_mtu)
265{
266 struct dlci_local *dlp = netdev_priv(dev);
267
268 return dev_set_mtu(dlp->slave, new_mtu);
269}
270
271static int dlci_open(struct net_device *dev)
272{
273 struct dlci_local *dlp;
274 struct frad_local *flp;
275 int err;
276
277 dlp = netdev_priv(dev);
278
279 if (!*(short *)(dev->dev_addr))
280 return(-EINVAL);
281
282 if (!netif_running(dlp->slave))
283 return(-ENOTCONN);
284
285 flp = netdev_priv(dlp->slave);
286 err = (*flp->activate)(dlp->slave, dev);
287 if (err)
288 return(err);
289
290 netif_start_queue(dev);
291
292 return 0;
293}
294
295static int dlci_close(struct net_device *dev)
296{
297 struct dlci_local *dlp;
298 struct frad_local *flp;
299 int err;
300
301 netif_stop_queue(dev);
302
303 dlp = netdev_priv(dev);
304
305 flp = netdev_priv(dlp->slave);
306 err = (*flp->deactivate)(dlp->slave, dev);
307
308 return 0;
309}
310
311static int dlci_add(struct dlci_add *dlci)
312{
313 struct net_device *master, *slave;
314 struct dlci_local *dlp;
315 struct frad_local *flp;
316 int err = -EINVAL;
317
318
319
320 slave = dev_get_by_name(&init_net, dlci->devname);
321 if (!slave)
322 return -ENODEV;
323
324 if (slave->type != ARPHRD_FRAD || netdev_priv(slave) == NULL)
325 goto err1;
326
327
328 master = alloc_netdev( sizeof(struct dlci_local), "dlci%d",
329 dlci_setup);
330 if (!master) {
331 err = -ENOMEM;
332 goto err1;
333 }
334
335
336 rtnl_lock();
337 list_for_each_entry(dlp, &dlci_devs, list) {
338 if (dlp->slave == slave) {
339 err = -EBUSY;
340 goto err2;
341 }
342 }
343
344 err = dev_alloc_name(master, master->name);
345 if (err < 0)
346 goto err2;
347
348 *(short *)(master->dev_addr) = dlci->dlci;
349
350 dlp = netdev_priv(master);
351 dlp->slave = slave;
352 dlp->master = master;
353
354 flp = netdev_priv(slave);
355 err = (*flp->assoc)(slave, master);
356 if (err < 0)
357 goto err2;
358
359 err = register_netdevice(master);
360 if (err < 0)
361 goto err2;
362
363 strcpy(dlci->devname, master->name);
364
365 list_add(&dlp->list, &dlci_devs);
366 rtnl_unlock();
367
368 return(0);
369
370 err2:
371 rtnl_unlock();
372 free_netdev(master);
373 err1:
374 dev_put(slave);
375 return(err);
376}
377
378static int dlci_del(struct dlci_add *dlci)
379{
380 struct dlci_local *dlp;
381 struct frad_local *flp;
382 struct net_device *master, *slave;
383 int err;
384
385
386 master = __dev_get_by_name(&init_net, dlci->devname);
387 if (!master)
388 return(-ENODEV);
389
390 if (netif_running(master)) {
391 return(-EBUSY);
392 }
393
394 dlp = netdev_priv(master);
395 slave = dlp->slave;
396 flp = netdev_priv(slave);
397
398 rtnl_lock();
399 err = (*flp->deassoc)(slave, master);
400 if (!err) {
401 list_del(&dlp->list);
402
403 unregister_netdevice(master);
404
405 dev_put(slave);
406 }
407 rtnl_unlock();
408
409 return(err);
410}
411
412static int dlci_ioctl(unsigned int cmd, void __user *arg)
413{
414 struct dlci_add add;
415 int err;
416
417 if (!capable(CAP_NET_ADMIN))
418 return(-EPERM);
419
420 if(copy_from_user(&add, arg, sizeof(struct dlci_add)))
421 return -EFAULT;
422
423 switch (cmd)
424 {
425 case SIOCADDDLCI:
426 err = dlci_add(&add);
427
428 if (!err)
429 if(copy_to_user(arg, &add, sizeof(struct dlci_add)))
430 return -EFAULT;
431 break;
432
433 case SIOCDELDLCI:
434 err = dlci_del(&add);
435 break;
436
437 default:
438 err = -EINVAL;
439 }
440
441 return(err);
442}
443
444static const struct header_ops dlci_header_ops = {
445 .create = dlci_header,
446};
447
448static const struct net_device_ops dlci_netdev_ops = {
449 .ndo_open = dlci_open,
450 .ndo_stop = dlci_close,
451 .ndo_do_ioctl = dlci_dev_ioctl,
452 .ndo_start_xmit = dlci_transmit,
453 .ndo_change_mtu = dlci_change_mtu,
454};
455
456static void dlci_setup(struct net_device *dev)
457{
458 struct dlci_local *dlp = netdev_priv(dev);
459
460 dev->flags = 0;
461 dev->header_ops = &dlci_header_ops;
462 dev->netdev_ops = &dlci_netdev_ops;
463 dev->destructor = free_netdev;
464
465 dlp->receive = dlci_receive;
466
467 dev->type = ARPHRD_DLCI;
468 dev->hard_header_len = sizeof(struct frhdr);
469 dev->addr_len = sizeof(short);
470
471}
472
473
474static int dlci_dev_event(struct notifier_block *unused,
475 unsigned long event, void *ptr)
476{
477 struct net_device *dev = (struct net_device *) ptr;
478
479 if (dev_net(dev) != &init_net)
480 return NOTIFY_DONE;
481
482 if (event == NETDEV_UNREGISTER) {
483 struct dlci_local *dlp;
484
485 list_for_each_entry(dlp, &dlci_devs, list) {
486 if (dlp->slave == dev) {
487 list_del(&dlp->list);
488 unregister_netdevice(dlp->master);
489 dev_put(dlp->slave);
490 break;
491 }
492 }
493 }
494 return NOTIFY_DONE;
495}
496
497static struct notifier_block dlci_notifier = {
498 .notifier_call = dlci_dev_event,
499};
500
501static int __init init_dlci(void)
502{
503 dlci_ioctl_set(dlci_ioctl);
504 register_netdevice_notifier(&dlci_notifier);
505
506 printk("%s.\n", version);
507
508 return 0;
509}
510
511static void __exit dlci_exit(void)
512{
513 struct dlci_local *dlp, *nxt;
514
515 dlci_ioctl_set(NULL);
516 unregister_netdevice_notifier(&dlci_notifier);
517
518 rtnl_lock();
519 list_for_each_entry_safe(dlp, nxt, &dlci_devs, list) {
520 unregister_netdevice(dlp->master);
521 dev_put(dlp->slave);
522 }
523 rtnl_unlock();
524}
525
526module_init(init_dlci);
527module_exit(dlci_exit);
528
529MODULE_AUTHOR("Mike McLagan");
530MODULE_DESCRIPTION("Frame Relay DLCI layer");
531MODULE_LICENSE("GPL");
532
