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>
14 * 0.15 Mike Mclagan Packet freeing, bug in kmalloc call
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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
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>
53 #include <asm/system.h>
56 #include <asm/uaccess.h>
58 static const char version[] = "DLCI driver v0.35, 4 Jan 1997, mike.mclagan@linux.org";
60 static LIST_HEAD(dlci_devs);
62 static void dlci_setup(struct net_device *);
65 * these encapsulate the RFC 1490 requirements as well as
66 * deal with packet transmission and reception, working with
67 * the upper network layers
70 static int dlci_header(struct sk_buff *skb, struct net_device *dev,
71 unsigned short type, const void *daddr,
72 const void *saddr, unsigned len)
75 struct dlci_local *dlp;
79 dlp = netdev_priv(dev);
81 hdr.control = FRAD_I_UI;
85 hdr.IP_NLPID = FRAD_P_IP;
86 hlen = sizeof(hdr.control) + sizeof(hdr.IP_NLPID);
89 /* feel free to add other types, if necessary */
92 hdr.pad = FRAD_P_PADDING;
93 hdr.NLPID = FRAD_P_SNAP;
94 memset(hdr.OUI, 0, sizeof(hdr.OUI));
95 hdr.PID = htons(type);
100 dest = skb_push(skb, hlen);
104 memcpy(dest, &hdr, hlen);
109 static void dlci_receive(struct sk_buff *skb, struct net_device *dev)
111 struct dlci_local *dlp;
115 dlp = netdev_priv(dev);
116 if (!pskb_may_pull(skb, sizeof(*hdr))) {
117 netdev_notice(dev, "invalid data no header\n");
118 dev->stats.rx_errors++;
123 hdr = (struct frhdr *) skb->data;
128 if (hdr->control != FRAD_I_UI)
130 netdev_notice(dev, "Invalid header flag 0x%02X\n",
132 dev->stats.rx_errors++;
135 switch (hdr->IP_NLPID)
138 if (hdr->NLPID != FRAD_P_SNAP)
140 netdev_notice(dev, "Unsupported NLPID 0x%02X\n",
142 dev->stats.rx_errors++;
146 if (hdr->OUI[0] + hdr->OUI[1] + hdr->OUI[2] != 0)
148 netdev_notice(dev, "Unsupported organizationally unique identifier 0x%02X-%02X-%02X\n",
152 dev->stats.rx_errors++;
156 /* at this point, it's an EtherType frame */
157 header = sizeof(struct frhdr);
158 /* Already in network order ! */
159 skb->protocol = hdr->PID;
164 header = sizeof(hdr->control) + sizeof(hdr->IP_NLPID);
165 skb->protocol = htons(ETH_P_IP);
172 netdev_notice(dev, "Unsupported NLPID 0x%02X\n",
174 dev->stats.rx_errors++;
178 netdev_notice(dev, "Invalid pad byte 0x%02X\n",
180 dev->stats.rx_errors++;
186 /* we've set up the protocol, so discard the header */
187 skb_reset_mac_header(skb);
188 skb_pull(skb, header);
189 dev->stats.rx_bytes += skb->len;
191 dev->stats.rx_packets++;
197 static netdev_tx_t dlci_transmit(struct sk_buff *skb, struct net_device *dev)
199 struct dlci_local *dlp = netdev_priv(dev);
202 dlp->slave->netdev_ops->ndo_start_xmit(skb, dlp->slave);
206 static int dlci_config(struct net_device *dev, struct dlci_conf __user *conf, int get)
208 struct dlci_conf config;
209 struct dlci_local *dlp;
210 struct frad_local *flp;
213 dlp = netdev_priv(dev);
215 flp = netdev_priv(dlp->slave);
219 if (copy_from_user(&config, conf, sizeof(struct dlci_conf)))
221 if (config.flags & ~DLCI_VALID_FLAGS)
223 memcpy(&dlp->config, &config, sizeof(struct dlci_conf));
227 err = (*flp->dlci_conf)(dlp->slave, dev, get);
233 if (copy_to_user(conf, &dlp->config, sizeof(struct dlci_conf)))
240 static int dlci_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
242 struct dlci_local *dlp;
244 if (!capable(CAP_NET_ADMIN))
247 dlp = netdev_priv(dev);
252 if (!*(short *)(dev->dev_addr))
255 strncpy(ifr->ifr_slave, dlp->slave->name, sizeof(ifr->ifr_slave));
260 if (!*(short *)(dev->dev_addr))
263 return dlci_config(dev, ifr->ifr_data, cmd == DLCI_GET_CONF);
272 static int dlci_change_mtu(struct net_device *dev, int new_mtu)
274 struct dlci_local *dlp = netdev_priv(dev);
276 return dev_set_mtu(dlp->slave, new_mtu);
279 static int dlci_open(struct net_device *dev)
281 struct dlci_local *dlp;
282 struct frad_local *flp;
285 dlp = netdev_priv(dev);
287 if (!*(short *)(dev->dev_addr))
290 if (!netif_running(dlp->slave))
293 flp = netdev_priv(dlp->slave);
294 err = (*flp->activate)(dlp->slave, dev);
298 netif_start_queue(dev);
303 static int dlci_close(struct net_device *dev)
305 struct dlci_local *dlp;
306 struct frad_local *flp;
309 netif_stop_queue(dev);
311 dlp = netdev_priv(dev);
313 flp = netdev_priv(dlp->slave);
314 err = (*flp->deactivate)(dlp->slave, dev);
319 static int dlci_add(struct dlci_add *dlci)
321 struct net_device *master, *slave;
322 struct dlci_local *dlp;
323 struct frad_local *flp;
327 /* validate slave device */
328 slave = dev_get_by_name(&init_net, dlci->devname);
332 if (slave->type != ARPHRD_FRAD || netdev_priv(slave) == NULL)
335 /* create device name */
336 master = alloc_netdev( sizeof(struct dlci_local), "dlci%d",
343 /* make sure same slave not already registered */
345 list_for_each_entry(dlp, &dlci_devs, list) {
346 if (dlp->slave == slave) {
352 *(short *)(master->dev_addr) = dlci->dlci;
354 dlp = netdev_priv(master);
356 dlp->master = master;
358 flp = netdev_priv(slave);
359 err = (*flp->assoc)(slave, master);
363 err = register_netdevice(master);
367 strcpy(dlci->devname, master->name);
369 list_add(&dlp->list, &dlci_devs);
382 static int dlci_del(struct dlci_add *dlci)
384 struct dlci_local *dlp;
385 struct frad_local *flp;
386 struct net_device *master, *slave;
389 /* validate slave device */
390 master = __dev_get_by_name(&init_net, dlci->devname);
394 if (netif_running(master)) {
398 dlp = netdev_priv(master);
400 flp = netdev_priv(slave);
403 err = (*flp->deassoc)(slave, master);
405 list_del(&dlp->list);
407 unregister_netdevice(master);
416 static int dlci_ioctl(unsigned int cmd, void __user *arg)
421 if (!capable(CAP_NET_ADMIN))
424 if (copy_from_user(&add, arg, sizeof(struct dlci_add)))
430 err = dlci_add(&add);
433 if (copy_to_user(arg, &add, sizeof(struct dlci_add)))
438 err = dlci_del(&add);
448 static const struct header_ops dlci_header_ops = {
449 .create = dlci_header,
452 static const struct net_device_ops dlci_netdev_ops = {
453 .ndo_open = dlci_open,
454 .ndo_stop = dlci_close,
455 .ndo_do_ioctl = dlci_dev_ioctl,
456 .ndo_start_xmit = dlci_transmit,
457 .ndo_change_mtu = dlci_change_mtu,
460 static void dlci_setup(struct net_device *dev)
462 struct dlci_local *dlp = netdev_priv(dev);
465 dev->header_ops = &dlci_header_ops;
466 dev->netdev_ops = &dlci_netdev_ops;
467 dev->destructor = free_netdev;
469 dlp->receive = dlci_receive;
471 dev->type = ARPHRD_DLCI;
472 dev->hard_header_len = sizeof(struct frhdr);
473 dev->addr_len = sizeof(short);
477 /* if slave is unregistering, then cleanup master */
478 static int dlci_dev_event(struct notifier_block *unused,
479 unsigned long event, void *ptr)
481 struct net_device *dev = (struct net_device *) ptr;
483 if (dev_net(dev) != &init_net)
486 if (event == NETDEV_UNREGISTER) {
487 struct dlci_local *dlp;
489 list_for_each_entry(dlp, &dlci_devs, list) {
490 if (dlp->slave == dev) {
491 list_del(&dlp->list);
492 unregister_netdevice(dlp->master);
501 static struct notifier_block dlci_notifier = {
502 .notifier_call = dlci_dev_event,
505 static int __init init_dlci(void)
507 dlci_ioctl_set(dlci_ioctl);
508 register_netdevice_notifier(&dlci_notifier);
510 printk("%s.\n", version);
515 static void __exit dlci_exit(void)
517 struct dlci_local *dlp, *nxt;
519 dlci_ioctl_set(NULL);
520 unregister_netdevice_notifier(&dlci_notifier);
523 list_for_each_entry_safe(dlp, nxt, &dlci_devs, list) {
524 unregister_netdevice(dlp->master);
530 module_init(init_dlci);
531 module_exit(dlci_exit);
533 MODULE_AUTHOR("Mike McLagan");
534 MODULE_DESCRIPTION("Frame Relay DLCI layer");
535 MODULE_LICENSE("GPL");