Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6/linux-mips/linux-dm7025.git] / drivers / net / wan / dlci.c
blobb14242768fad19c381cff1d3d232d4abcf5f7e24
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.
8 * Version: @(#)dlci.c 0.35 4 Jan 1997
10 * Author: Mike McLagan <mike.mclagan@linux.org>
12 * Changes:
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
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.
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>
49 #include <net/sock.h>
51 #include <asm/system.h>
52 #include <asm/io.h>
53 #include <asm/dma.h>
54 #include <asm/uaccess.h>
56 static const char version[] = "DLCI driver v0.35, 4 Jan 1997, mike.mclagan@linux.org";
58 static LIST_HEAD(dlci_devs);
60 static void dlci_setup(struct net_device *);
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
68 static int dlci_header(struct sk_buff *skb, struct net_device *dev,
69 unsigned short type, const void *daddr,
70 const void *saddr, unsigned len)
72 struct frhdr hdr;
73 struct dlci_local *dlp;
74 unsigned int hlen;
75 char *dest;
77 dlp = dev->priv;
79 hdr.control = FRAD_I_UI;
80 switch(type)
82 case ETH_P_IP:
83 hdr.IP_NLPID = FRAD_P_IP;
84 hlen = sizeof(hdr.control) + sizeof(hdr.IP_NLPID);
85 break;
87 /* feel free to add other types, if necessary */
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;
98 dest = skb_push(skb, hlen);
99 if (!dest)
100 return(0);
102 memcpy(dest, &hdr, hlen);
104 return(hlen);
107 static void dlci_receive(struct sk_buff *skb, struct net_device *dev)
109 struct dlci_local *dlp;
110 struct frhdr *hdr;
111 int process, header;
113 dlp = dev->priv;
114 if (!pskb_may_pull(skb, sizeof(*hdr))) {
115 printk(KERN_NOTICE "%s: invalid data no header\n",
116 dev->name);
117 dlp->stats.rx_errors++;
118 kfree_skb(skb);
119 return;
122 hdr = (struct frhdr *) skb->data;
123 process = 0;
124 header = 0;
125 skb->dev = dev;
127 if (hdr->control != FRAD_I_UI)
129 printk(KERN_NOTICE "%s: Invalid header flag 0x%02X.\n", dev->name, hdr->control);
130 dlp->stats.rx_errors++;
132 else
133 switch(hdr->IP_NLPID)
135 case FRAD_P_PADDING:
136 if (hdr->NLPID != FRAD_P_SNAP)
138 printk(KERN_NOTICE "%s: Unsupported NLPID 0x%02X.\n", dev->name, hdr->NLPID);
139 dlp->stats.rx_errors++;
140 break;
143 if (hdr->OUI[0] + hdr->OUI[1] + hdr->OUI[2] != 0)
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 dlp->stats.rx_errors++;
147 break;
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;
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;
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 dlp->stats.rx_errors++;
168 break;
170 default:
171 printk(KERN_NOTICE "%s: Invalid pad byte 0x%02X.\n", dev->name, hdr->pad);
172 dlp->stats.rx_errors++;
173 break;
176 if (process)
178 /* we've set up the protocol, so discard the header */
179 skb_reset_mac_header(skb);
180 skb_pull(skb, header);
181 dlp->stats.rx_bytes += skb->len;
182 netif_rx(skb);
183 dlp->stats.rx_packets++;
184 dev->last_rx = jiffies;
186 else
187 dev_kfree_skb(skb);
190 static int dlci_transmit(struct sk_buff *skb, struct net_device *dev)
192 struct dlci_local *dlp;
193 int ret;
195 ret = 0;
197 if (!skb || !dev)
198 return(0);
200 dlp = dev->priv;
202 netif_stop_queue(dev);
204 ret = dlp->slave->hard_start_xmit(skb, dlp->slave);
205 switch (ret)
207 case DLCI_RET_OK:
208 dlp->stats.tx_packets++;
209 ret = 0;
210 break;
211 case DLCI_RET_ERR:
212 dlp->stats.tx_errors++;
213 ret = 0;
214 break;
215 case DLCI_RET_DROP:
216 dlp->stats.tx_dropped++;
217 ret = 1;
218 break;
220 /* Alan Cox recommends always returning 0, and always freeing the packet */
221 /* experience suggest a slightly more conservative approach */
223 if (!ret)
225 dev_kfree_skb(skb);
226 netif_wake_queue(dev);
228 return(ret);
231 static int dlci_config(struct net_device *dev, struct dlci_conf __user *conf, int get)
233 struct dlci_conf config;
234 struct dlci_local *dlp;
235 struct frad_local *flp;
236 int err;
238 dlp = dev->priv;
240 flp = dlp->slave->priv;
242 if (!get)
244 if(copy_from_user(&config, conf, sizeof(struct dlci_conf)))
245 return -EFAULT;
246 if (config.flags & ~DLCI_VALID_FLAGS)
247 return(-EINVAL);
248 memcpy(&dlp->config, &config, sizeof(struct dlci_conf));
249 dlp->configured = 1;
252 err = (*flp->dlci_conf)(dlp->slave, dev, get);
253 if (err)
254 return(err);
256 if (get)
258 if(copy_to_user(conf, &dlp->config, sizeof(struct dlci_conf)))
259 return -EFAULT;
262 return(0);
265 static int dlci_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
267 struct dlci_local *dlp;
269 if (!capable(CAP_NET_ADMIN))
270 return(-EPERM);
272 dlp = dev->priv;
274 switch(cmd)
276 case DLCI_GET_SLAVE:
277 if (!*(short *)(dev->dev_addr))
278 return(-EINVAL);
280 strncpy(ifr->ifr_slave, dlp->slave->name, sizeof(ifr->ifr_slave));
281 break;
283 case DLCI_GET_CONF:
284 case DLCI_SET_CONF:
285 if (!*(short *)(dev->dev_addr))
286 return(-EINVAL);
288 return(dlci_config(dev, ifr->ifr_data, cmd == DLCI_GET_CONF));
289 break;
291 default:
292 return(-EOPNOTSUPP);
294 return(0);
297 static int dlci_change_mtu(struct net_device *dev, int new_mtu)
299 struct dlci_local *dlp;
301 dlp = dev->priv;
303 return((*dlp->slave->change_mtu)(dlp->slave, new_mtu));
306 static int dlci_open(struct net_device *dev)
308 struct dlci_local *dlp;
309 struct frad_local *flp;
310 int err;
312 dlp = dev->priv;
314 if (!*(short *)(dev->dev_addr))
315 return(-EINVAL);
317 if (!netif_running(dlp->slave))
318 return(-ENOTCONN);
320 flp = dlp->slave->priv;
321 err = (*flp->activate)(dlp->slave, dev);
322 if (err)
323 return(err);
325 netif_start_queue(dev);
327 return 0;
330 static int dlci_close(struct net_device *dev)
332 struct dlci_local *dlp;
333 struct frad_local *flp;
334 int err;
336 netif_stop_queue(dev);
338 dlp = dev->priv;
340 flp = dlp->slave->priv;
341 err = (*flp->deactivate)(dlp->slave, dev);
343 return 0;
346 static struct net_device_stats *dlci_get_stats(struct net_device *dev)
348 struct dlci_local *dlp;
350 dlp = dev->priv;
352 return(&dlp->stats);
355 static int dlci_add(struct dlci_add *dlci)
357 struct net_device *master, *slave;
358 struct dlci_local *dlp;
359 struct frad_local *flp;
360 int err = -EINVAL;
363 /* validate slave device */
364 slave = dev_get_by_name(&init_net, dlci->devname);
365 if (!slave)
366 return -ENODEV;
368 if (slave->type != ARPHRD_FRAD || slave->priv == NULL)
369 goto err1;
371 /* create device name */
372 master = alloc_netdev( sizeof(struct dlci_local), "dlci%d",
373 dlci_setup);
374 if (!master) {
375 err = -ENOMEM;
376 goto err1;
379 /* make sure same slave not already registered */
380 rtnl_lock();
381 list_for_each_entry(dlp, &dlci_devs, list) {
382 if (dlp->slave == slave) {
383 err = -EBUSY;
384 goto err2;
388 err = dev_alloc_name(master, master->name);
389 if (err < 0)
390 goto err2;
392 *(short *)(master->dev_addr) = dlci->dlci;
394 dlp = (struct dlci_local *) master->priv;
395 dlp->slave = slave;
396 dlp->master = master;
398 flp = slave->priv;
399 err = (*flp->assoc)(slave, master);
400 if (err < 0)
401 goto err2;
403 err = register_netdevice(master);
404 if (err < 0)
405 goto err2;
407 strcpy(dlci->devname, master->name);
409 list_add(&dlp->list, &dlci_devs);
410 rtnl_unlock();
412 return(0);
414 err2:
415 rtnl_unlock();
416 free_netdev(master);
417 err1:
418 dev_put(slave);
419 return(err);
422 static int dlci_del(struct dlci_add *dlci)
424 struct dlci_local *dlp;
425 struct frad_local *flp;
426 struct net_device *master, *slave;
427 int err;
429 /* validate slave device */
430 master = __dev_get_by_name(&init_net, dlci->devname);
431 if (!master)
432 return(-ENODEV);
434 if (netif_running(master)) {
435 return(-EBUSY);
438 dlp = master->priv;
439 slave = dlp->slave;
440 flp = slave->priv;
442 rtnl_lock();
443 err = (*flp->deassoc)(slave, master);
444 if (!err) {
445 list_del(&dlp->list);
447 unregister_netdevice(master);
449 dev_put(slave);
451 rtnl_unlock();
453 return(err);
456 static int dlci_ioctl(unsigned int cmd, void __user *arg)
458 struct dlci_add add;
459 int err;
461 if (!capable(CAP_NET_ADMIN))
462 return(-EPERM);
464 if(copy_from_user(&add, arg, sizeof(struct dlci_add)))
465 return -EFAULT;
467 switch (cmd)
469 case SIOCADDDLCI:
470 err = dlci_add(&add);
472 if (!err)
473 if(copy_to_user(arg, &add, sizeof(struct dlci_add)))
474 return -EFAULT;
475 break;
477 case SIOCDELDLCI:
478 err = dlci_del(&add);
479 break;
481 default:
482 err = -EINVAL;
485 return(err);
488 static const struct header_ops dlci_header_ops = {
489 .create = dlci_header,
492 static void dlci_setup(struct net_device *dev)
494 struct dlci_local *dlp = dev->priv;
496 dev->flags = 0;
497 dev->open = dlci_open;
498 dev->stop = dlci_close;
499 dev->do_ioctl = dlci_dev_ioctl;
500 dev->hard_start_xmit = dlci_transmit;
501 dev->header_ops = &dlci_header_ops;
502 dev->get_stats = dlci_get_stats;
503 dev->change_mtu = dlci_change_mtu;
504 dev->destructor = free_netdev;
506 dlp->receive = dlci_receive;
508 dev->type = ARPHRD_DLCI;
509 dev->hard_header_len = sizeof(struct frhdr);
510 dev->addr_len = sizeof(short);
514 /* if slave is unregistering, then cleanup master */
515 static int dlci_dev_event(struct notifier_block *unused,
516 unsigned long event, void *ptr)
518 struct net_device *dev = (struct net_device *) ptr;
520 if (dev_net(dev) != &init_net)
521 return NOTIFY_DONE;
523 if (event == NETDEV_UNREGISTER) {
524 struct dlci_local *dlp;
526 list_for_each_entry(dlp, &dlci_devs, list) {
527 if (dlp->slave == dev) {
528 list_del(&dlp->list);
529 unregister_netdevice(dlp->master);
530 dev_put(dlp->slave);
531 break;
535 return NOTIFY_DONE;
538 static struct notifier_block dlci_notifier = {
539 .notifier_call = dlci_dev_event,
542 static int __init init_dlci(void)
544 dlci_ioctl_set(dlci_ioctl);
545 register_netdevice_notifier(&dlci_notifier);
547 printk("%s.\n", version);
549 return 0;
552 static void __exit dlci_exit(void)
554 struct dlci_local *dlp, *nxt;
556 dlci_ioctl_set(NULL);
557 unregister_netdevice_notifier(&dlci_notifier);
559 rtnl_lock();
560 list_for_each_entry_safe(dlp, nxt, &dlci_devs, list) {
561 unregister_netdevice(dlp->master);
562 dev_put(dlp->slave);
564 rtnl_unlock();
567 module_init(init_dlci);
568 module_exit(dlci_exit);
570 MODULE_AUTHOR("Mike McLagan");
571 MODULE_DESCRIPTION("Frame Relay DLCI layer");
572 MODULE_LICENSE("GPL");