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Commit | Line | Data |
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1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
56 | static const char version[] = "DLCI driver v0.35, 4 Jan 1997, mike.mclagan@linux.org"; | |
57 | ||
58 | static LIST_HEAD(dlci_devs); | |
59 | ||
60 | static 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 | ||
68 | static int dlci_header(struct sk_buff *skb, struct net_device *dev, | |
3b04ddde SH |
69 | unsigned short type, const void *daddr, |
70 | const void *saddr, unsigned len) | |
1da177e4 LT |
71 | { |
72 | struct frhdr hdr; | |
73 | struct dlci_local *dlp; | |
74 | unsigned int hlen; | |
75 | char *dest; | |
76 | ||
8f15ea42 | 77 | dlp = netdev_priv(dev); |
1da177e4 LT |
78 | |
79 | hdr.control = FRAD_I_UI; | |
48b3d3ef | 80 | switch (type) |
1da177e4 LT |
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) | |
807540ba | 100 | return 0; |
1da177e4 LT |
101 | |
102 | memcpy(dest, &hdr, hlen); | |
103 | ||
807540ba | 104 | return hlen; |
1da177e4 LT |
105 | } |
106 | ||
107 | static 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 | ||
8f15ea42 | 113 | dlp = netdev_priv(dev); |
1da177e4 LT |
114 | if (!pskb_may_pull(skb, sizeof(*hdr))) { |
115 | printk(KERN_NOTICE "%s: invalid data no header\n", | |
116 | dev->name); | |
07d117cf | 117 | dev->stats.rx_errors++; |
1da177e4 LT |
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); | |
07d117cf | 130 | dev->stats.rx_errors++; |
1da177e4 LT |
131 | } |
132 | else | |
48b3d3ef | 133 | switch (hdr->IP_NLPID) |
1da177e4 LT |
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); | |
07d117cf | 139 | dev->stats.rx_errors++; |
1da177e4 LT |
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]); | |
07d117cf | 146 | dev->stats.rx_errors++; |
1da177e4 LT |
147 | 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); | |
07d117cf | 167 | dev->stats.rx_errors++; |
1da177e4 LT |
168 | break; |
169 | ||
170 | default: | |
171 | printk(KERN_NOTICE "%s: Invalid pad byte 0x%02X.\n", dev->name, hdr->pad); | |
07d117cf | 172 | dev->stats.rx_errors++; |
1da177e4 LT |
173 | break; |
174 | } | |
175 | ||
176 | if (process) | |
177 | { | |
178 | /* we've set up the protocol, so discard the header */ | |
459a98ed | 179 | skb_reset_mac_header(skb); |
1da177e4 | 180 | skb_pull(skb, header); |
07d117cf | 181 | dev->stats.rx_bytes += skb->len; |
1da177e4 | 182 | netif_rx(skb); |
07d117cf | 183 | dev->stats.rx_packets++; |
1da177e4 LT |
184 | } |
185 | else | |
186 | dev_kfree_skb(skb); | |
187 | } | |
188 | ||
38482428 | 189 | static netdev_tx_t dlci_transmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 190 | { |
38482428 | 191 | struct dlci_local *dlp = netdev_priv(dev); |
1da177e4 | 192 | |
38482428 SH |
193 | if (skb) |
194 | dlp->slave->netdev_ops->ndo_start_xmit(skb, dlp->slave); | |
195 | return NETDEV_TX_OK; | |
1da177e4 LT |
196 | } |
197 | ||
198 | static 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 | ||
8f15ea42 | 205 | dlp = netdev_priv(dev); |
1da177e4 | 206 | |
8f15ea42 | 207 | flp = netdev_priv(dlp->slave); |
1da177e4 LT |
208 | |
209 | if (!get) | |
210 | { | |
48b3d3ef | 211 | if (copy_from_user(&config, conf, sizeof(struct dlci_conf))) |
1da177e4 LT |
212 | return -EFAULT; |
213 | if (config.flags & ~DLCI_VALID_FLAGS) | |
807540ba | 214 | return -EINVAL; |
1da177e4 LT |
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) | |
807540ba | 221 | return err; |
1da177e4 LT |
222 | |
223 | if (get) | |
224 | { | |
48b3d3ef | 225 | if (copy_to_user(conf, &dlp->config, sizeof(struct dlci_conf))) |
1da177e4 LT |
226 | return -EFAULT; |
227 | } | |
228 | ||
807540ba | 229 | return 0; |
1da177e4 LT |
230 | } |
231 | ||
232 | static 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)) | |
807540ba | 237 | return -EPERM; |
1da177e4 | 238 | |
8f15ea42 | 239 | dlp = netdev_priv(dev); |
1da177e4 | 240 | |
48b3d3ef | 241 | switch (cmd) |
1da177e4 LT |
242 | { |
243 | case DLCI_GET_SLAVE: | |
244 | if (!*(short *)(dev->dev_addr)) | |
807540ba | 245 | return -EINVAL; |
1da177e4 LT |
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)) | |
807540ba | 253 | return -EINVAL; |
1da177e4 | 254 | |
807540ba | 255 | return dlci_config(dev, ifr->ifr_data, cmd == DLCI_GET_CONF); |
1da177e4 LT |
256 | break; |
257 | ||
258 | default: | |
807540ba | 259 | return -EOPNOTSUPP; |
1da177e4 | 260 | } |
807540ba | 261 | return 0; |
1da177e4 LT |
262 | } |
263 | ||
264 | static int dlci_change_mtu(struct net_device *dev, int new_mtu) | |
265 | { | |
49e8abaf | 266 | struct dlci_local *dlp = netdev_priv(dev); |
1da177e4 | 267 | |
49e8abaf | 268 | return dev_set_mtu(dlp->slave, new_mtu); |
1da177e4 LT |
269 | } |
270 | ||
271 | static int dlci_open(struct net_device *dev) | |
272 | { | |
273 | struct dlci_local *dlp; | |
274 | struct frad_local *flp; | |
275 | int err; | |
276 | ||
8f15ea42 | 277 | dlp = netdev_priv(dev); |
1da177e4 LT |
278 | |
279 | if (!*(short *)(dev->dev_addr)) | |
807540ba | 280 | return -EINVAL; |
1da177e4 LT |
281 | |
282 | if (!netif_running(dlp->slave)) | |
807540ba | 283 | return -ENOTCONN; |
1da177e4 | 284 | |
8f15ea42 | 285 | flp = netdev_priv(dlp->slave); |
1da177e4 LT |
286 | err = (*flp->activate)(dlp->slave, dev); |
287 | if (err) | |
807540ba | 288 | return err; |
1da177e4 LT |
289 | |
290 | netif_start_queue(dev); | |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
295 | static 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 | ||
8f15ea42 | 303 | dlp = netdev_priv(dev); |
1da177e4 | 304 | |
8f15ea42 | 305 | flp = netdev_priv(dlp->slave); |
1da177e4 LT |
306 | err = (*flp->deactivate)(dlp->slave, dev); |
307 | ||
308 | return 0; | |
309 | } | |
310 | ||
1da177e4 LT |
311 | static 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 */ | |
881d966b | 320 | slave = dev_get_by_name(&init_net, dlci->devname); |
1da177e4 LT |
321 | if (!slave) |
322 | return -ENODEV; | |
323 | ||
8f15ea42 | 324 | if (slave->type != ARPHRD_FRAD || netdev_priv(slave) == NULL) |
1da177e4 LT |
325 | 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 | ||
8f15ea42 | 350 | dlp = netdev_priv(master); |
1da177e4 LT |
351 | dlp->slave = slave; |
352 | dlp->master = master; | |
353 | ||
8f15ea42 | 354 | flp = netdev_priv(slave); |
1da177e4 LT |
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 | ||
807540ba | 368 | return 0; |
1da177e4 LT |
369 | |
370 | err2: | |
371 | rtnl_unlock(); | |
372 | free_netdev(master); | |
373 | err1: | |
374 | dev_put(slave); | |
807540ba | 375 | return err; |
1da177e4 LT |
376 | } |
377 | ||
378 | static 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 */ | |
881d966b | 386 | master = __dev_get_by_name(&init_net, dlci->devname); |
1da177e4 | 387 | if (!master) |
807540ba | 388 | return -ENODEV; |
1da177e4 LT |
389 | |
390 | if (netif_running(master)) { | |
807540ba | 391 | return -EBUSY; |
1da177e4 LT |
392 | } |
393 | ||
8f15ea42 | 394 | dlp = netdev_priv(master); |
1da177e4 | 395 | slave = dlp->slave; |
8f15ea42 | 396 | flp = netdev_priv(slave); |
1da177e4 LT |
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 | ||
807540ba | 409 | return err; |
1da177e4 LT |
410 | } |
411 | ||
412 | static 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)) | |
807540ba | 418 | return -EPERM; |
1da177e4 | 419 | |
48b3d3ef | 420 | if (copy_from_user(&add, arg, sizeof(struct dlci_add))) |
1da177e4 LT |
421 | return -EFAULT; |
422 | ||
423 | switch (cmd) | |
424 | { | |
425 | case SIOCADDDLCI: | |
426 | err = dlci_add(&add); | |
427 | ||
428 | if (!err) | |
48b3d3ef | 429 | if (copy_to_user(arg, &add, sizeof(struct dlci_add))) |
1da177e4 LT |
430 | return -EFAULT; |
431 | break; | |
432 | ||
433 | case SIOCDELDLCI: | |
434 | err = dlci_del(&add); | |
435 | break; | |
436 | ||
437 | default: | |
438 | err = -EINVAL; | |
439 | } | |
440 | ||
807540ba | 441 | return err; |
1da177e4 LT |
442 | } |
443 | ||
3b04ddde SH |
444 | static const struct header_ops dlci_header_ops = { |
445 | .create = dlci_header, | |
446 | }; | |
447 | ||
49e8abaf SH |
448 | static 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 | ||
1da177e4 LT |
456 | static void dlci_setup(struct net_device *dev) |
457 | { | |
8f15ea42 | 458 | struct dlci_local *dlp = netdev_priv(dev); |
1da177e4 LT |
459 | |
460 | dev->flags = 0; | |
3b04ddde | 461 | dev->header_ops = &dlci_header_ops; |
49e8abaf | 462 | dev->netdev_ops = &dlci_netdev_ops; |
1da177e4 LT |
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 | /* if slave is unregistering, then cleanup master */ | |
474 | static 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 | ||
c346dca1 | 479 | if (dev_net(dev) != &init_net) |
e9dc8653 EB |
480 | return NOTIFY_DONE; |
481 | ||
1da177e4 LT |
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 | ||
497 | static struct notifier_block dlci_notifier = { | |
498 | .notifier_call = dlci_dev_event, | |
499 | }; | |
500 | ||
501 | static 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 | ||
511 | static 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 | ||
526 | module_init(init_dlci); | |
527 | module_exit(dlci_exit); | |
528 | ||
529 | MODULE_AUTHOR("Mike McLagan"); | |
530 | MODULE_DESCRIPTION("Frame Relay DLCI layer"); | |
531 | MODULE_LICENSE("GPL"); |