Commit | Line | Data |
---|---|---|
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 | ||
86fb0ccf JP |
31 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
32 | ||
1da177e4 LT |
33 | #include <linux/module.h> |
34 | #include <linux/kernel.h> | |
35 | #include <linux/types.h> | |
36 | #include <linux/fcntl.h> | |
37 | #include <linux/interrupt.h> | |
38 | #include <linux/ptrace.h> | |
39 | #include <linux/ioport.h> | |
40 | #include <linux/in.h> | |
41 | #include <linux/init.h> | |
42 | #include <linux/slab.h> | |
43 | #include <linux/string.h> | |
44 | #include <linux/errno.h> | |
45 | #include <linux/netdevice.h> | |
46 | #include <linux/skbuff.h> | |
47 | #include <linux/if_arp.h> | |
48 | #include <linux/if_frad.h> | |
49 | #include <linux/bitops.h> | |
50 | ||
51 | #include <net/sock.h> | |
52 | ||
1da177e4 LT |
53 | #include <asm/io.h> |
54 | #include <asm/dma.h> | |
55 | #include <asm/uaccess.h> | |
56 | ||
57 | static const char version[] = "DLCI driver v0.35, 4 Jan 1997, mike.mclagan@linux.org"; | |
58 | ||
59 | static LIST_HEAD(dlci_devs); | |
60 | ||
61 | static 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 | ||
69 | static int dlci_header(struct sk_buff *skb, struct net_device *dev, | |
3b04ddde SH |
70 | unsigned short type, const void *daddr, |
71 | const void *saddr, unsigned len) | |
1da177e4 LT |
72 | { |
73 | struct frhdr hdr; | |
74 | struct dlci_local *dlp; | |
75 | unsigned int hlen; | |
76 | char *dest; | |
77 | ||
8f15ea42 | 78 | dlp = netdev_priv(dev); |
1da177e4 LT |
79 | |
80 | hdr.control = FRAD_I_UI; | |
48b3d3ef | 81 | switch (type) |
1da177e4 LT |
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) | |
807540ba | 101 | return 0; |
1da177e4 LT |
102 | |
103 | memcpy(dest, &hdr, hlen); | |
104 | ||
807540ba | 105 | return hlen; |
1da177e4 LT |
106 | } |
107 | ||
108 | static 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 | ||
8f15ea42 | 114 | dlp = netdev_priv(dev); |
1da177e4 | 115 | if (!pskb_may_pull(skb, sizeof(*hdr))) { |
86fb0ccf | 116 | netdev_notice(dev, "invalid data no header\n"); |
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 | { | |
86fb0ccf JP |
129 | netdev_notice(dev, "Invalid header flag 0x%02X\n", |
130 | hdr->control); | |
07d117cf | 131 | dev->stats.rx_errors++; |
1da177e4 LT |
132 | } |
133 | else | |
48b3d3ef | 134 | switch (hdr->IP_NLPID) |
1da177e4 LT |
135 | { |
136 | case FRAD_P_PADDING: | |
137 | if (hdr->NLPID != FRAD_P_SNAP) | |
138 | { | |
86fb0ccf JP |
139 | netdev_notice(dev, "Unsupported NLPID 0x%02X\n", |
140 | hdr->NLPID); | |
07d117cf | 141 | dev->stats.rx_errors++; |
1da177e4 LT |
142 | break; |
143 | } | |
144 | ||
145 | if (hdr->OUI[0] + hdr->OUI[1] + hdr->OUI[2] != 0) | |
146 | { | |
86fb0ccf JP |
147 | netdev_notice(dev, "Unsupported organizationally unique identifier 0x%02X-%02X-%02X\n", |
148 | hdr->OUI[0], | |
149 | hdr->OUI[1], | |
150 | hdr->OUI[2]); | |
07d117cf | 151 | dev->stats.rx_errors++; |
1da177e4 LT |
152 | break; |
153 | } | |
154 | ||
155 | /* at this point, it's an EtherType frame */ | |
156 | header = sizeof(struct frhdr); | |
157 | /* Already in network order ! */ | |
158 | skb->protocol = hdr->PID; | |
159 | process = 1; | |
160 | break; | |
161 | ||
162 | case FRAD_P_IP: | |
163 | header = sizeof(hdr->control) + sizeof(hdr->IP_NLPID); | |
164 | skb->protocol = htons(ETH_P_IP); | |
165 | process = 1; | |
166 | break; | |
167 | ||
168 | case FRAD_P_SNAP: | |
169 | case FRAD_P_Q933: | |
170 | case FRAD_P_CLNP: | |
86fb0ccf JP |
171 | netdev_notice(dev, "Unsupported NLPID 0x%02X\n", |
172 | hdr->pad); | |
07d117cf | 173 | dev->stats.rx_errors++; |
1da177e4 LT |
174 | break; |
175 | ||
176 | default: | |
86fb0ccf JP |
177 | netdev_notice(dev, "Invalid pad byte 0x%02X\n", |
178 | hdr->pad); | |
07d117cf | 179 | dev->stats.rx_errors++; |
1da177e4 LT |
180 | break; |
181 | } | |
182 | ||
183 | if (process) | |
184 | { | |
185 | /* we've set up the protocol, so discard the header */ | |
459a98ed | 186 | skb_reset_mac_header(skb); |
1da177e4 | 187 | skb_pull(skb, header); |
07d117cf | 188 | dev->stats.rx_bytes += skb->len; |
1da177e4 | 189 | netif_rx(skb); |
07d117cf | 190 | dev->stats.rx_packets++; |
1da177e4 LT |
191 | } |
192 | else | |
193 | dev_kfree_skb(skb); | |
194 | } | |
195 | ||
38482428 | 196 | static netdev_tx_t dlci_transmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 197 | { |
38482428 | 198 | struct dlci_local *dlp = netdev_priv(dev); |
1da177e4 | 199 | |
38482428 SH |
200 | if (skb) |
201 | dlp->slave->netdev_ops->ndo_start_xmit(skb, dlp->slave); | |
202 | return NETDEV_TX_OK; | |
1da177e4 LT |
203 | } |
204 | ||
205 | static int dlci_config(struct net_device *dev, struct dlci_conf __user *conf, int get) | |
206 | { | |
207 | struct dlci_conf config; | |
208 | struct dlci_local *dlp; | |
209 | struct frad_local *flp; | |
210 | int err; | |
211 | ||
8f15ea42 | 212 | dlp = netdev_priv(dev); |
1da177e4 | 213 | |
8f15ea42 | 214 | flp = netdev_priv(dlp->slave); |
1da177e4 LT |
215 | |
216 | if (!get) | |
217 | { | |
48b3d3ef | 218 | if (copy_from_user(&config, conf, sizeof(struct dlci_conf))) |
1da177e4 LT |
219 | return -EFAULT; |
220 | if (config.flags & ~DLCI_VALID_FLAGS) | |
807540ba | 221 | return -EINVAL; |
1da177e4 LT |
222 | memcpy(&dlp->config, &config, sizeof(struct dlci_conf)); |
223 | dlp->configured = 1; | |
224 | } | |
225 | ||
226 | err = (*flp->dlci_conf)(dlp->slave, dev, get); | |
227 | if (err) | |
807540ba | 228 | return err; |
1da177e4 LT |
229 | |
230 | if (get) | |
231 | { | |
48b3d3ef | 232 | if (copy_to_user(conf, &dlp->config, sizeof(struct dlci_conf))) |
1da177e4 LT |
233 | return -EFAULT; |
234 | } | |
235 | ||
807540ba | 236 | return 0; |
1da177e4 LT |
237 | } |
238 | ||
239 | static int dlci_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
240 | { | |
241 | struct dlci_local *dlp; | |
242 | ||
243 | if (!capable(CAP_NET_ADMIN)) | |
807540ba | 244 | return -EPERM; |
1da177e4 | 245 | |
8f15ea42 | 246 | dlp = netdev_priv(dev); |
1da177e4 | 247 | |
48b3d3ef | 248 | switch (cmd) |
1da177e4 LT |
249 | { |
250 | case DLCI_GET_SLAVE: | |
251 | if (!*(short *)(dev->dev_addr)) | |
807540ba | 252 | return -EINVAL; |
1da177e4 LT |
253 | |
254 | strncpy(ifr->ifr_slave, dlp->slave->name, sizeof(ifr->ifr_slave)); | |
255 | break; | |
256 | ||
257 | case DLCI_GET_CONF: | |
258 | case DLCI_SET_CONF: | |
259 | if (!*(short *)(dev->dev_addr)) | |
807540ba | 260 | return -EINVAL; |
1da177e4 | 261 | |
807540ba | 262 | return dlci_config(dev, ifr->ifr_data, cmd == DLCI_GET_CONF); |
1da177e4 LT |
263 | break; |
264 | ||
265 | default: | |
807540ba | 266 | return -EOPNOTSUPP; |
1da177e4 | 267 | } |
807540ba | 268 | return 0; |
1da177e4 LT |
269 | } |
270 | ||
271 | static int dlci_change_mtu(struct net_device *dev, int new_mtu) | |
272 | { | |
49e8abaf | 273 | struct dlci_local *dlp = netdev_priv(dev); |
1da177e4 | 274 | |
49e8abaf | 275 | return dev_set_mtu(dlp->slave, new_mtu); |
1da177e4 LT |
276 | } |
277 | ||
278 | static int dlci_open(struct net_device *dev) | |
279 | { | |
280 | struct dlci_local *dlp; | |
281 | struct frad_local *flp; | |
282 | int err; | |
283 | ||
8f15ea42 | 284 | dlp = netdev_priv(dev); |
1da177e4 LT |
285 | |
286 | if (!*(short *)(dev->dev_addr)) | |
807540ba | 287 | return -EINVAL; |
1da177e4 LT |
288 | |
289 | if (!netif_running(dlp->slave)) | |
807540ba | 290 | return -ENOTCONN; |
1da177e4 | 291 | |
8f15ea42 | 292 | flp = netdev_priv(dlp->slave); |
1da177e4 LT |
293 | err = (*flp->activate)(dlp->slave, dev); |
294 | if (err) | |
807540ba | 295 | return err; |
1da177e4 LT |
296 | |
297 | netif_start_queue(dev); | |
298 | ||
299 | return 0; | |
300 | } | |
301 | ||
302 | static int dlci_close(struct net_device *dev) | |
303 | { | |
304 | struct dlci_local *dlp; | |
305 | struct frad_local *flp; | |
306 | int err; | |
307 | ||
308 | netif_stop_queue(dev); | |
309 | ||
8f15ea42 | 310 | dlp = netdev_priv(dev); |
1da177e4 | 311 | |
8f15ea42 | 312 | flp = netdev_priv(dlp->slave); |
1da177e4 LT |
313 | err = (*flp->deactivate)(dlp->slave, dev); |
314 | ||
315 | return 0; | |
316 | } | |
317 | ||
1da177e4 LT |
318 | static int dlci_add(struct dlci_add *dlci) |
319 | { | |
320 | struct net_device *master, *slave; | |
321 | struct dlci_local *dlp; | |
322 | struct frad_local *flp; | |
323 | int err = -EINVAL; | |
324 | ||
325 | ||
326 | /* validate slave device */ | |
881d966b | 327 | slave = dev_get_by_name(&init_net, dlci->devname); |
1da177e4 LT |
328 | if (!slave) |
329 | return -ENODEV; | |
330 | ||
8f15ea42 | 331 | if (slave->type != ARPHRD_FRAD || netdev_priv(slave) == NULL) |
1da177e4 LT |
332 | goto err1; |
333 | ||
334 | /* create device name */ | |
335 | master = alloc_netdev( sizeof(struct dlci_local), "dlci%d", | |
336 | dlci_setup); | |
337 | if (!master) { | |
338 | err = -ENOMEM; | |
339 | goto err1; | |
340 | } | |
341 | ||
342 | /* make sure same slave not already registered */ | |
343 | rtnl_lock(); | |
344 | list_for_each_entry(dlp, &dlci_devs, list) { | |
345 | if (dlp->slave == slave) { | |
346 | err = -EBUSY; | |
347 | goto err2; | |
348 | } | |
349 | } | |
350 | ||
1da177e4 LT |
351 | *(short *)(master->dev_addr) = dlci->dlci; |
352 | ||
8f15ea42 | 353 | dlp = netdev_priv(master); |
1da177e4 LT |
354 | dlp->slave = slave; |
355 | dlp->master = master; | |
356 | ||
8f15ea42 | 357 | flp = netdev_priv(slave); |
1da177e4 LT |
358 | err = (*flp->assoc)(slave, master); |
359 | if (err < 0) | |
360 | goto err2; | |
361 | ||
362 | err = register_netdevice(master); | |
363 | if (err < 0) | |
364 | goto err2; | |
365 | ||
366 | strcpy(dlci->devname, master->name); | |
367 | ||
368 | list_add(&dlp->list, &dlci_devs); | |
369 | rtnl_unlock(); | |
370 | ||
807540ba | 371 | return 0; |
1da177e4 LT |
372 | |
373 | err2: | |
374 | rtnl_unlock(); | |
375 | free_netdev(master); | |
376 | err1: | |
377 | dev_put(slave); | |
807540ba | 378 | return err; |
1da177e4 LT |
379 | } |
380 | ||
381 | static int dlci_del(struct dlci_add *dlci) | |
382 | { | |
383 | struct dlci_local *dlp; | |
384 | struct frad_local *flp; | |
385 | struct net_device *master, *slave; | |
386 | int err; | |
578a1310 | 387 | bool found = false; |
1da177e4 | 388 | |
11eb2645 ZL |
389 | rtnl_lock(); |
390 | ||
1da177e4 | 391 | /* validate slave device */ |
881d966b | 392 | master = __dev_get_by_name(&init_net, dlci->devname); |
11eb2645 ZL |
393 | if (!master) { |
394 | err = -ENODEV; | |
395 | goto out; | |
396 | } | |
1da177e4 | 397 | |
578a1310 ZL |
398 | list_for_each_entry(dlp, &dlci_devs, list) { |
399 | if (dlp->master == master) { | |
400 | found = true; | |
401 | break; | |
402 | } | |
403 | } | |
404 | if (!found) { | |
405 | err = -ENODEV; | |
406 | goto out; | |
407 | } | |
408 | ||
1da177e4 | 409 | if (netif_running(master)) { |
11eb2645 ZL |
410 | err = -EBUSY; |
411 | goto out; | |
1da177e4 LT |
412 | } |
413 | ||
8f15ea42 | 414 | dlp = netdev_priv(master); |
1da177e4 | 415 | slave = dlp->slave; |
8f15ea42 | 416 | flp = netdev_priv(slave); |
1da177e4 | 417 | |
1da177e4 LT |
418 | err = (*flp->deassoc)(slave, master); |
419 | if (!err) { | |
420 | list_del(&dlp->list); | |
421 | ||
422 | unregister_netdevice(master); | |
423 | ||
424 | dev_put(slave); | |
425 | } | |
11eb2645 | 426 | out: |
1da177e4 | 427 | rtnl_unlock(); |
807540ba | 428 | return err; |
1da177e4 LT |
429 | } |
430 | ||
431 | static int dlci_ioctl(unsigned int cmd, void __user *arg) | |
432 | { | |
433 | struct dlci_add add; | |
434 | int err; | |
435 | ||
436 | if (!capable(CAP_NET_ADMIN)) | |
807540ba | 437 | return -EPERM; |
1da177e4 | 438 | |
48b3d3ef | 439 | if (copy_from_user(&add, arg, sizeof(struct dlci_add))) |
1da177e4 LT |
440 | return -EFAULT; |
441 | ||
442 | switch (cmd) | |
443 | { | |
444 | case SIOCADDDLCI: | |
445 | err = dlci_add(&add); | |
446 | ||
447 | if (!err) | |
48b3d3ef | 448 | if (copy_to_user(arg, &add, sizeof(struct dlci_add))) |
1da177e4 LT |
449 | return -EFAULT; |
450 | break; | |
451 | ||
452 | case SIOCDELDLCI: | |
453 | err = dlci_del(&add); | |
454 | break; | |
455 | ||
456 | default: | |
457 | err = -EINVAL; | |
458 | } | |
459 | ||
807540ba | 460 | return err; |
1da177e4 LT |
461 | } |
462 | ||
3b04ddde SH |
463 | static const struct header_ops dlci_header_ops = { |
464 | .create = dlci_header, | |
465 | }; | |
466 | ||
49e8abaf SH |
467 | static const struct net_device_ops dlci_netdev_ops = { |
468 | .ndo_open = dlci_open, | |
469 | .ndo_stop = dlci_close, | |
470 | .ndo_do_ioctl = dlci_dev_ioctl, | |
471 | .ndo_start_xmit = dlci_transmit, | |
472 | .ndo_change_mtu = dlci_change_mtu, | |
473 | }; | |
474 | ||
1da177e4 LT |
475 | static void dlci_setup(struct net_device *dev) |
476 | { | |
8f15ea42 | 477 | struct dlci_local *dlp = netdev_priv(dev); |
1da177e4 LT |
478 | |
479 | dev->flags = 0; | |
3b04ddde | 480 | dev->header_ops = &dlci_header_ops; |
49e8abaf | 481 | dev->netdev_ops = &dlci_netdev_ops; |
1da177e4 LT |
482 | dev->destructor = free_netdev; |
483 | ||
484 | dlp->receive = dlci_receive; | |
485 | ||
486 | dev->type = ARPHRD_DLCI; | |
487 | dev->hard_header_len = sizeof(struct frhdr); | |
488 | dev->addr_len = sizeof(short); | |
489 | ||
490 | } | |
491 | ||
492 | /* if slave is unregistering, then cleanup master */ | |
493 | static int dlci_dev_event(struct notifier_block *unused, | |
494 | unsigned long event, void *ptr) | |
495 | { | |
496 | struct net_device *dev = (struct net_device *) ptr; | |
497 | ||
c346dca1 | 498 | if (dev_net(dev) != &init_net) |
e9dc8653 EB |
499 | return NOTIFY_DONE; |
500 | ||
1da177e4 LT |
501 | if (event == NETDEV_UNREGISTER) { |
502 | struct dlci_local *dlp; | |
503 | ||
504 | list_for_each_entry(dlp, &dlci_devs, list) { | |
505 | if (dlp->slave == dev) { | |
506 | list_del(&dlp->list); | |
507 | unregister_netdevice(dlp->master); | |
508 | dev_put(dlp->slave); | |
509 | break; | |
510 | } | |
511 | } | |
512 | } | |
513 | return NOTIFY_DONE; | |
514 | } | |
515 | ||
516 | static struct notifier_block dlci_notifier = { | |
517 | .notifier_call = dlci_dev_event, | |
518 | }; | |
519 | ||
520 | static int __init init_dlci(void) | |
521 | { | |
522 | dlci_ioctl_set(dlci_ioctl); | |
523 | register_netdevice_notifier(&dlci_notifier); | |
524 | ||
525 | printk("%s.\n", version); | |
526 | ||
527 | return 0; | |
528 | } | |
529 | ||
530 | static void __exit dlci_exit(void) | |
531 | { | |
532 | struct dlci_local *dlp, *nxt; | |
533 | ||
534 | dlci_ioctl_set(NULL); | |
535 | unregister_netdevice_notifier(&dlci_notifier); | |
536 | ||
537 | rtnl_lock(); | |
538 | list_for_each_entry_safe(dlp, nxt, &dlci_devs, list) { | |
539 | unregister_netdevice(dlp->master); | |
540 | dev_put(dlp->slave); | |
541 | } | |
542 | rtnl_unlock(); | |
543 | } | |
544 | ||
545 | module_init(init_dlci); | |
546 | module_exit(dlci_exit); | |
547 | ||
548 | MODULE_AUTHOR("Mike McLagan"); | |
549 | MODULE_DESCRIPTION("Frame Relay DLCI layer"); | |
550 | MODULE_LICENSE("GPL"); |