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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 | ||
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> | |
7c0f6ba6 | 55 | #include <linux/uaccess.h> |
1da177e4 LT |
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; | |
1da177e4 LT |
74 | unsigned int hlen; |
75 | char *dest; | |
76 | ||
1da177e4 | 77 | hdr.control = FRAD_I_UI; |
48b3d3ef | 78 | switch (type) |
1da177e4 LT |
79 | { |
80 | case ETH_P_IP: | |
81 | hdr.IP_NLPID = FRAD_P_IP; | |
82 | hlen = sizeof(hdr.control) + sizeof(hdr.IP_NLPID); | |
83 | break; | |
84 | ||
85 | /* feel free to add other types, if necessary */ | |
86 | ||
87 | default: | |
88 | hdr.pad = FRAD_P_PADDING; | |
89 | hdr.NLPID = FRAD_P_SNAP; | |
90 | memset(hdr.OUI, 0, sizeof(hdr.OUI)); | |
91 | hdr.PID = htons(type); | |
92 | hlen = sizeof(hdr); | |
93 | break; | |
94 | } | |
95 | ||
96 | dest = skb_push(skb, hlen); | |
97 | if (!dest) | |
807540ba | 98 | return 0; |
1da177e4 LT |
99 | |
100 | memcpy(dest, &hdr, hlen); | |
101 | ||
807540ba | 102 | return hlen; |
1da177e4 LT |
103 | } |
104 | ||
105 | static void dlci_receive(struct sk_buff *skb, struct net_device *dev) | |
106 | { | |
1da177e4 LT |
107 | struct frhdr *hdr; |
108 | int process, header; | |
109 | ||
1da177e4 | 110 | if (!pskb_may_pull(skb, sizeof(*hdr))) { |
86fb0ccf | 111 | netdev_notice(dev, "invalid data no header\n"); |
07d117cf | 112 | dev->stats.rx_errors++; |
1da177e4 LT |
113 | kfree_skb(skb); |
114 | return; | |
115 | } | |
116 | ||
117 | hdr = (struct frhdr *) skb->data; | |
118 | process = 0; | |
119 | header = 0; | |
120 | skb->dev = dev; | |
121 | ||
122 | if (hdr->control != FRAD_I_UI) | |
123 | { | |
86fb0ccf JP |
124 | netdev_notice(dev, "Invalid header flag 0x%02X\n", |
125 | hdr->control); | |
07d117cf | 126 | dev->stats.rx_errors++; |
1da177e4 LT |
127 | } |
128 | else | |
48b3d3ef | 129 | switch (hdr->IP_NLPID) |
1da177e4 LT |
130 | { |
131 | case FRAD_P_PADDING: | |
132 | if (hdr->NLPID != FRAD_P_SNAP) | |
133 | { | |
86fb0ccf JP |
134 | netdev_notice(dev, "Unsupported NLPID 0x%02X\n", |
135 | hdr->NLPID); | |
07d117cf | 136 | dev->stats.rx_errors++; |
1da177e4 LT |
137 | break; |
138 | } | |
139 | ||
140 | if (hdr->OUI[0] + hdr->OUI[1] + hdr->OUI[2] != 0) | |
141 | { | |
86fb0ccf JP |
142 | netdev_notice(dev, "Unsupported organizationally unique identifier 0x%02X-%02X-%02X\n", |
143 | hdr->OUI[0], | |
144 | hdr->OUI[1], | |
145 | 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: | |
86fb0ccf JP |
166 | netdev_notice(dev, "Unsupported NLPID 0x%02X\n", |
167 | hdr->pad); | |
07d117cf | 168 | dev->stats.rx_errors++; |
1da177e4 LT |
169 | break; |
170 | ||
171 | default: | |
86fb0ccf JP |
172 | netdev_notice(dev, "Invalid pad byte 0x%02X\n", |
173 | hdr->pad); | |
07d117cf | 174 | dev->stats.rx_errors++; |
1da177e4 LT |
175 | break; |
176 | } | |
177 | ||
178 | if (process) | |
179 | { | |
180 | /* we've set up the protocol, so discard the header */ | |
459a98ed | 181 | skb_reset_mac_header(skb); |
1da177e4 | 182 | skb_pull(skb, header); |
07d117cf | 183 | dev->stats.rx_bytes += skb->len; |
1da177e4 | 184 | netif_rx(skb); |
07d117cf | 185 | dev->stats.rx_packets++; |
1da177e4 LT |
186 | } |
187 | else | |
188 | dev_kfree_skb(skb); | |
189 | } | |
190 | ||
38482428 | 191 | static netdev_tx_t dlci_transmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 192 | { |
38482428 | 193 | struct dlci_local *dlp = netdev_priv(dev); |
1da177e4 | 194 | |
10b3ad8c DM |
195 | if (skb) { |
196 | struct netdev_queue *txq = skb_get_tx_queue(dev, skb); | |
fa2dbdc2 | 197 | netdev_start_xmit(skb, dlp->slave, txq, false); |
10b3ad8c | 198 | } |
38482428 | 199 | return NETDEV_TX_OK; |
1da177e4 LT |
200 | } |
201 | ||
202 | static int dlci_config(struct net_device *dev, struct dlci_conf __user *conf, int get) | |
203 | { | |
204 | struct dlci_conf config; | |
205 | struct dlci_local *dlp; | |
206 | struct frad_local *flp; | |
207 | int err; | |
208 | ||
8f15ea42 | 209 | dlp = netdev_priv(dev); |
1da177e4 | 210 | |
8f15ea42 | 211 | flp = netdev_priv(dlp->slave); |
1da177e4 LT |
212 | |
213 | if (!get) | |
214 | { | |
48b3d3ef | 215 | if (copy_from_user(&config, conf, sizeof(struct dlci_conf))) |
1da177e4 LT |
216 | return -EFAULT; |
217 | if (config.flags & ~DLCI_VALID_FLAGS) | |
807540ba | 218 | return -EINVAL; |
1da177e4 LT |
219 | memcpy(&dlp->config, &config, sizeof(struct dlci_conf)); |
220 | dlp->configured = 1; | |
221 | } | |
222 | ||
223 | err = (*flp->dlci_conf)(dlp->slave, dev, get); | |
224 | if (err) | |
807540ba | 225 | return err; |
1da177e4 LT |
226 | |
227 | if (get) | |
228 | { | |
48b3d3ef | 229 | if (copy_to_user(conf, &dlp->config, sizeof(struct dlci_conf))) |
1da177e4 LT |
230 | return -EFAULT; |
231 | } | |
232 | ||
807540ba | 233 | return 0; |
1da177e4 LT |
234 | } |
235 | ||
236 | static int dlci_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
237 | { | |
238 | struct dlci_local *dlp; | |
239 | ||
240 | if (!capable(CAP_NET_ADMIN)) | |
807540ba | 241 | return -EPERM; |
1da177e4 | 242 | |
8f15ea42 | 243 | dlp = netdev_priv(dev); |
1da177e4 | 244 | |
48b3d3ef | 245 | switch (cmd) |
1da177e4 LT |
246 | { |
247 | case DLCI_GET_SLAVE: | |
248 | if (!*(short *)(dev->dev_addr)) | |
807540ba | 249 | return -EINVAL; |
1da177e4 LT |
250 | |
251 | strncpy(ifr->ifr_slave, dlp->slave->name, sizeof(ifr->ifr_slave)); | |
252 | break; | |
253 | ||
254 | case DLCI_GET_CONF: | |
255 | case DLCI_SET_CONF: | |
256 | if (!*(short *)(dev->dev_addr)) | |
807540ba | 257 | return -EINVAL; |
1da177e4 | 258 | |
807540ba | 259 | return dlci_config(dev, ifr->ifr_data, cmd == DLCI_GET_CONF); |
1da177e4 LT |
260 | |
261 | default: | |
807540ba | 262 | return -EOPNOTSUPP; |
1da177e4 | 263 | } |
807540ba | 264 | return 0; |
1da177e4 LT |
265 | } |
266 | ||
267 | static int dlci_change_mtu(struct net_device *dev, int new_mtu) | |
268 | { | |
49e8abaf | 269 | struct dlci_local *dlp = netdev_priv(dev); |
1da177e4 | 270 | |
49e8abaf | 271 | return dev_set_mtu(dlp->slave, new_mtu); |
1da177e4 LT |
272 | } |
273 | ||
274 | static int dlci_open(struct net_device *dev) | |
275 | { | |
276 | struct dlci_local *dlp; | |
277 | struct frad_local *flp; | |
278 | int err; | |
279 | ||
8f15ea42 | 280 | dlp = netdev_priv(dev); |
1da177e4 LT |
281 | |
282 | if (!*(short *)(dev->dev_addr)) | |
807540ba | 283 | return -EINVAL; |
1da177e4 LT |
284 | |
285 | if (!netif_running(dlp->slave)) | |
807540ba | 286 | return -ENOTCONN; |
1da177e4 | 287 | |
8f15ea42 | 288 | flp = netdev_priv(dlp->slave); |
1da177e4 LT |
289 | err = (*flp->activate)(dlp->slave, dev); |
290 | if (err) | |
807540ba | 291 | return err; |
1da177e4 LT |
292 | |
293 | netif_start_queue(dev); | |
294 | ||
295 | return 0; | |
296 | } | |
297 | ||
298 | static int dlci_close(struct net_device *dev) | |
299 | { | |
300 | struct dlci_local *dlp; | |
301 | struct frad_local *flp; | |
302 | int err; | |
303 | ||
304 | netif_stop_queue(dev); | |
305 | ||
8f15ea42 | 306 | dlp = netdev_priv(dev); |
1da177e4 | 307 | |
8f15ea42 | 308 | flp = netdev_priv(dlp->slave); |
1da177e4 LT |
309 | err = (*flp->deactivate)(dlp->slave, dev); |
310 | ||
311 | return 0; | |
312 | } | |
313 | ||
1da177e4 LT |
314 | static int dlci_add(struct dlci_add *dlci) |
315 | { | |
316 | struct net_device *master, *slave; | |
317 | struct dlci_local *dlp; | |
318 | struct frad_local *flp; | |
319 | int err = -EINVAL; | |
320 | ||
321 | ||
322 | /* validate slave device */ | |
881d966b | 323 | slave = dev_get_by_name(&init_net, dlci->devname); |
1da177e4 LT |
324 | if (!slave) |
325 | return -ENODEV; | |
326 | ||
8f15ea42 | 327 | if (slave->type != ARPHRD_FRAD || netdev_priv(slave) == NULL) |
1da177e4 LT |
328 | goto err1; |
329 | ||
330 | /* create device name */ | |
c835a677 TG |
331 | master = alloc_netdev(sizeof(struct dlci_local), "dlci%d", |
332 | NET_NAME_UNKNOWN, dlci_setup); | |
1da177e4 LT |
333 | if (!master) { |
334 | err = -ENOMEM; | |
335 | goto err1; | |
336 | } | |
337 | ||
338 | /* make sure same slave not already registered */ | |
339 | rtnl_lock(); | |
340 | list_for_each_entry(dlp, &dlci_devs, list) { | |
341 | if (dlp->slave == slave) { | |
342 | err = -EBUSY; | |
343 | goto err2; | |
344 | } | |
345 | } | |
346 | ||
1da177e4 LT |
347 | *(short *)(master->dev_addr) = dlci->dlci; |
348 | ||
8f15ea42 | 349 | dlp = netdev_priv(master); |
1da177e4 LT |
350 | dlp->slave = slave; |
351 | dlp->master = master; | |
352 | ||
8f15ea42 | 353 | flp = netdev_priv(slave); |
1da177e4 LT |
354 | err = (*flp->assoc)(slave, master); |
355 | if (err < 0) | |
356 | goto err2; | |
357 | ||
358 | err = register_netdevice(master); | |
359 | if (err < 0) | |
360 | goto err2; | |
361 | ||
362 | strcpy(dlci->devname, master->name); | |
363 | ||
364 | list_add(&dlp->list, &dlci_devs); | |
365 | rtnl_unlock(); | |
366 | ||
807540ba | 367 | return 0; |
1da177e4 LT |
368 | |
369 | err2: | |
370 | rtnl_unlock(); | |
371 | free_netdev(master); | |
372 | err1: | |
373 | dev_put(slave); | |
807540ba | 374 | return err; |
1da177e4 LT |
375 | } |
376 | ||
377 | static int dlci_del(struct dlci_add *dlci) | |
378 | { | |
379 | struct dlci_local *dlp; | |
380 | struct frad_local *flp; | |
381 | struct net_device *master, *slave; | |
382 | int err; | |
578a1310 | 383 | bool found = false; |
1da177e4 | 384 | |
11eb2645 | 385 | rtnl_lock(); |
1da177e4 LT |
386 | |
387 | /* validate slave device */ | |
881d966b | 388 | master = __dev_get_by_name(&init_net, dlci->devname); |
11eb2645 ZL |
389 | if (!master) { |
390 | err = -ENODEV; | |
391 | goto out; | |
392 | } | |
1da177e4 | 393 | |
578a1310 ZL |
394 | list_for_each_entry(dlp, &dlci_devs, list) { |
395 | if (dlp->master == master) { | |
396 | found = true; | |
397 | break; | |
398 | } | |
399 | } | |
400 | if (!found) { | |
401 | err = -ENODEV; | |
402 | goto out; | |
403 | } | |
1da177e4 LT |
404 | |
405 | if (netif_running(master)) { | |
11eb2645 ZL |
406 | err = -EBUSY; |
407 | goto out; | |
1da177e4 LT |
408 | } |
409 | ||
8f15ea42 | 410 | dlp = netdev_priv(master); |
1da177e4 | 411 | slave = dlp->slave; |
8f15ea42 | 412 | flp = netdev_priv(slave); |
1da177e4 | 413 | |
1da177e4 LT |
414 | err = (*flp->deassoc)(slave, master); |
415 | if (!err) { | |
416 | list_del(&dlp->list); | |
417 | ||
418 | unregister_netdevice(master); | |
419 | ||
420 | dev_put(slave); | |
421 | } | |
11eb2645 | 422 | out: |
1da177e4 | 423 | rtnl_unlock(); |
807540ba | 424 | return err; |
1da177e4 LT |
425 | } |
426 | ||
427 | static int dlci_ioctl(unsigned int cmd, void __user *arg) | |
428 | { | |
429 | struct dlci_add add; | |
430 | int err; | |
431 | ||
432 | if (!capable(CAP_NET_ADMIN)) | |
807540ba | 433 | return -EPERM; |
1da177e4 | 434 | |
48b3d3ef | 435 | if (copy_from_user(&add, arg, sizeof(struct dlci_add))) |
1da177e4 LT |
436 | return -EFAULT; |
437 | ||
438 | switch (cmd) | |
439 | { | |
440 | case SIOCADDDLCI: | |
441 | err = dlci_add(&add); | |
442 | ||
443 | if (!err) | |
48b3d3ef | 444 | if (copy_to_user(arg, &add, sizeof(struct dlci_add))) |
1da177e4 LT |
445 | return -EFAULT; |
446 | break; | |
447 | ||
448 | case SIOCDELDLCI: | |
449 | err = dlci_del(&add); | |
450 | break; | |
451 | ||
452 | default: | |
453 | err = -EINVAL; | |
454 | } | |
455 | ||
807540ba | 456 | return err; |
1da177e4 LT |
457 | } |
458 | ||
3b04ddde SH |
459 | static const struct header_ops dlci_header_ops = { |
460 | .create = dlci_header, | |
461 | }; | |
462 | ||
49e8abaf SH |
463 | static const struct net_device_ops dlci_netdev_ops = { |
464 | .ndo_open = dlci_open, | |
465 | .ndo_stop = dlci_close, | |
466 | .ndo_do_ioctl = dlci_dev_ioctl, | |
467 | .ndo_start_xmit = dlci_transmit, | |
468 | .ndo_change_mtu = dlci_change_mtu, | |
469 | }; | |
470 | ||
1da177e4 LT |
471 | static void dlci_setup(struct net_device *dev) |
472 | { | |
8f15ea42 | 473 | struct dlci_local *dlp = netdev_priv(dev); |
1da177e4 LT |
474 | |
475 | dev->flags = 0; | |
3b04ddde | 476 | dev->header_ops = &dlci_header_ops; |
49e8abaf | 477 | dev->netdev_ops = &dlci_netdev_ops; |
1da177e4 LT |
478 | dev->destructor = free_netdev; |
479 | ||
480 | dlp->receive = dlci_receive; | |
481 | ||
482 | dev->type = ARPHRD_DLCI; | |
483 | dev->hard_header_len = sizeof(struct frhdr); | |
484 | dev->addr_len = sizeof(short); | |
485 | ||
486 | } | |
487 | ||
488 | /* if slave is unregistering, then cleanup master */ | |
489 | static int dlci_dev_event(struct notifier_block *unused, | |
490 | unsigned long event, void *ptr) | |
491 | { | |
351638e7 | 492 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
1da177e4 | 493 | |
c346dca1 | 494 | if (dev_net(dev) != &init_net) |
e9dc8653 EB |
495 | return NOTIFY_DONE; |
496 | ||
1da177e4 LT |
497 | if (event == NETDEV_UNREGISTER) { |
498 | struct dlci_local *dlp; | |
499 | ||
500 | list_for_each_entry(dlp, &dlci_devs, list) { | |
501 | if (dlp->slave == dev) { | |
502 | list_del(&dlp->list); | |
503 | unregister_netdevice(dlp->master); | |
504 | dev_put(dlp->slave); | |
505 | break; | |
506 | } | |
507 | } | |
508 | } | |
509 | return NOTIFY_DONE; | |
510 | } | |
511 | ||
512 | static struct notifier_block dlci_notifier = { | |
513 | .notifier_call = dlci_dev_event, | |
514 | }; | |
515 | ||
516 | static int __init init_dlci(void) | |
517 | { | |
518 | dlci_ioctl_set(dlci_ioctl); | |
519 | register_netdevice_notifier(&dlci_notifier); | |
520 | ||
521 | printk("%s.\n", version); | |
522 | ||
523 | return 0; | |
524 | } | |
525 | ||
526 | static void __exit dlci_exit(void) | |
527 | { | |
528 | struct dlci_local *dlp, *nxt; | |
529 | ||
530 | dlci_ioctl_set(NULL); | |
531 | unregister_netdevice_notifier(&dlci_notifier); | |
532 | ||
533 | rtnl_lock(); | |
534 | list_for_each_entry_safe(dlp, nxt, &dlci_devs, list) { | |
535 | unregister_netdevice(dlp->master); | |
536 | dev_put(dlp->slave); | |
537 | } | |
538 | rtnl_unlock(); | |
539 | } | |
540 | ||
541 | module_init(init_dlci); | |
542 | module_exit(dlci_exit); | |
543 | ||
544 | MODULE_AUTHOR("Mike McLagan"); | |
545 | MODULE_DESCRIPTION("Frame Relay DLCI layer"); | |
546 | MODULE_LICENSE("GPL"); |