blob: 15d353f268b5fd907e9bc894c1f6147b8d27c2da [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#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 * these encapsulate the RFC 1490 requirements as well as
64 * deal with packet transmission and reception, working with
65 * the upper network layers
66 */
67
68static int dlci_header(struct sk_buff *skb, struct net_device *dev,
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -070069 unsigned short type, const void *daddr,
70 const void *saddr, unsigned len)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071{
72 struct frhdr hdr;
73 struct dlci_local *dlp;
74 unsigned int hlen;
75 char *dest;
76
Wang Chen8f15ea42008-11-12 23:38:36 -080077 dlp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
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 /* feel free to add other types, if necessary */
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
Wang Chen8f15ea42008-11-12 23:38:36 -0800113 dlp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 if (!pskb_may_pull(skb, sizeof(*hdr))) {
115 printk(KERN_NOTICE "%s: invalid data no header\n",
116 dev->name);
Stephen Hemminger07d117c2009-03-20 19:36:14 +0000117 dev->stats.rx_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 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);
Stephen Hemminger07d117c2009-03-20 19:36:14 +0000130 dev->stats.rx_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 }
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);
Stephen Hemminger07d117c2009-03-20 19:36:14 +0000139 dev->stats.rx_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 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]);
Stephen Hemminger07d117c2009-03-20 19:36:14 +0000146 dev->stats.rx_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 break;
148 }
149
150 /* at this point, it's an EtherType frame */
151 header = sizeof(struct frhdr);
152 /* Already in network order ! */
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);
Stephen Hemminger07d117c2009-03-20 19:36:14 +0000167 dev->stats.rx_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 break;
169
170 default:
171 printk(KERN_NOTICE "%s: Invalid pad byte 0x%02X.\n", dev->name, hdr->pad);
Stephen Hemminger07d117c2009-03-20 19:36:14 +0000172 dev->stats.rx_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 break;
174 }
175
176 if (process)
177 {
178 /* we've set up the protocol, so discard the header */
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -0700179 skb_reset_mac_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 skb_pull(skb, header);
Stephen Hemminger07d117c2009-03-20 19:36:14 +0000181 dev->stats.rx_bytes += skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 netif_rx(skb);
Stephen Hemminger07d117c2009-03-20 19:36:14 +0000183 dev->stats.rx_packets++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 }
185 else
186 dev_kfree_skb(skb);
187}
188
Stephen Hemminger38482422009-09-04 05:33:46 +0000189static netdev_tx_t dlci_transmit(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190{
Stephen Hemminger38482422009-09-04 05:33:46 +0000191 struct dlci_local *dlp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192
Stephen Hemminger38482422009-09-04 05:33:46 +0000193 if (skb)
194 dlp->slave->netdev_ops->ndo_start_xmit(skb, dlp->slave);
195 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196}
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
Wang Chen8f15ea42008-11-12 23:38:36 -0800205 dlp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206
Wang Chen8f15ea42008-11-12 23:38:36 -0800207 flp = netdev_priv(dlp->slave);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
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
Wang Chen8f15ea42008-11-12 23:38:36 -0800239 dlp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
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{
Stephen Hemminger49e8aba2009-03-20 19:36:15 +0000266 struct dlci_local *dlp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
Stephen Hemminger49e8aba2009-03-20 19:36:15 +0000268 return dev_set_mtu(dlp->slave, new_mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269}
270
271static int dlci_open(struct net_device *dev)
272{
273 struct dlci_local *dlp;
274 struct frad_local *flp;
275 int err;
276
Wang Chen8f15ea42008-11-12 23:38:36 -0800277 dlp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
279 if (!*(short *)(dev->dev_addr))
280 return(-EINVAL);
281
282 if (!netif_running(dlp->slave))
283 return(-ENOTCONN);
284
Wang Chen8f15ea42008-11-12 23:38:36 -0800285 flp = netdev_priv(dlp->slave);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 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
Wang Chen8f15ea42008-11-12 23:38:36 -0800303 dlp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
Wang Chen8f15ea42008-11-12 23:38:36 -0800305 flp = netdev_priv(dlp->slave);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 err = (*flp->deactivate)(dlp->slave, dev);
307
308 return 0;
309}
310
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311static 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 /* validate slave device */
Eric W. Biederman881d9662007-09-17 11:56:21 -0700320 slave = dev_get_by_name(&init_net, dlci->devname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 if (!slave)
322 return -ENODEV;
323
Wang Chen8f15ea42008-11-12 23:38:36 -0800324 if (slave->type != ARPHRD_FRAD || netdev_priv(slave) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 goto err1;
326
327 /* create device name */
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 /* make sure same slave not already registered */
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
Wang Chen8f15ea42008-11-12 23:38:36 -0800350 dlp = netdev_priv(master);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 dlp->slave = slave;
352 dlp->master = master;
353
Wang Chen8f15ea42008-11-12 23:38:36 -0800354 flp = netdev_priv(slave);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 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 /* validate slave device */
Eric W. Biederman881d9662007-09-17 11:56:21 -0700386 master = __dev_get_by_name(&init_net, dlci->devname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 if (!master)
388 return(-ENODEV);
389
390 if (netif_running(master)) {
391 return(-EBUSY);
392 }
393
Wang Chen8f15ea42008-11-12 23:38:36 -0800394 dlp = netdev_priv(master);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 slave = dlp->slave;
Wang Chen8f15ea42008-11-12 23:38:36 -0800396 flp = netdev_priv(slave);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397
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
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700444static const struct header_ops dlci_header_ops = {
445 .create = dlci_header,
446};
447
Stephen Hemminger49e8aba2009-03-20 19:36:15 +0000448static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456static void dlci_setup(struct net_device *dev)
457{
Wang Chen8f15ea42008-11-12 23:38:36 -0800458 struct dlci_local *dlp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459
460 dev->flags = 0;
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700461 dev->header_ops = &dlci_header_ops;
Stephen Hemminger49e8aba2009-03-20 19:36:15 +0000462 dev->netdev_ops = &dlci_netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 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/* if slave is unregistering, then cleanup master */
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
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900479 if (dev_net(dev) != &init_net)
Eric W. Biedermane9dc8652007-09-12 13:02:17 +0200480 return NOTIFY_DONE;
481
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 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");