aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/wan/dlci.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/net/wan/dlci.c')
-rw-r--r--drivers/net/wan/dlci.c541
1 files changed, 0 insertions, 541 deletions
diff --git a/drivers/net/wan/dlci.c b/drivers/net/wan/dlci.c
deleted file mode 100644
index 3ca4daf63389..000000000000
--- a/drivers/net/wan/dlci.c
+++ /dev/null
@@ -1,541 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * DLCI Implementation of Frame Relay protocol for Linux, according to
- * RFC 1490. This generic device provides en/decapsulation for an
- * underlying hardware driver. Routes & IPs are assigned to these
- * interfaces. Requires 'dlcicfg' program to create usable
- * interfaces, the initial one, 'dlci' is for IOCTL use only.
- *
- * Version: @(#)dlci.c 0.35 4 Jan 1997
- *
- * Author: Mike McLagan <mike.mclagan@linux.org>
- *
- * Changes:
- *
- * 0.15 Mike Mclagan Packet freeing, bug in kmalloc call
- * DLCI_RET handling
- * 0.20 Mike McLagan More conservative on which packets
- * are returned for retry and which are
- * are dropped. If DLCI_RET_DROP is
- * returned from the FRAD, the packet is
- * sent back to Linux for re-transmission
- * 0.25 Mike McLagan Converted to use SIOC IOCTL calls
- * 0.30 Jim Freeman Fixed to allow IPX traffic
- * 0.35 Michael Elizabeth Fixed incorrect memcpy_fromfs
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/types.h>
-#include <linux/fcntl.h>
-#include <linux/interrupt.h>
-#include <linux/ptrace.h>
-#include <linux/ioport.h>
-#include <linux/in.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/string.h>
-#include <linux/errno.h>
-#include <linux/netdevice.h>
-#include <linux/skbuff.h>
-#include <linux/if_arp.h>
-#include <linux/if_frad.h>
-#include <linux/bitops.h>
-
-#include <net/sock.h>
-
-#include <asm/io.h>
-#include <asm/dma.h>
-#include <linux/uaccess.h>
-
-static const char version[] = "DLCI driver v0.35, 4 Jan 1997, mike.mclagan@linux.org";
-
-static LIST_HEAD(dlci_devs);
-
-static void dlci_setup(struct net_device *);
-
-/*
- * these encapsulate the RFC 1490 requirements as well as
- * deal with packet transmission and reception, working with
- * the upper network layers
- */
-
-static int dlci_header(struct sk_buff *skb, struct net_device *dev,
- unsigned short type, const void *daddr,
- const void *saddr, unsigned len)
-{
- struct frhdr hdr;
- unsigned int hlen;
- char *dest;
-
- hdr.control = FRAD_I_UI;
- switch (type)
- {
- case ETH_P_IP:
- hdr.IP_NLPID = FRAD_P_IP;
- hlen = sizeof(hdr.control) + sizeof(hdr.IP_NLPID);
- break;
-
- /* feel free to add other types, if necessary */
-
- default:
- hdr.pad = FRAD_P_PADDING;
- hdr.NLPID = FRAD_P_SNAP;
- memset(hdr.OUI, 0, sizeof(hdr.OUI));
- hdr.PID = htons(type);
- hlen = sizeof(hdr);
- break;
- }
-
- dest = skb_push(skb, hlen);
- if (!dest)
- return 0;
-
- memcpy(dest, &hdr, hlen);
-
- return hlen;
-}
-
-static void dlci_receive(struct sk_buff *skb, struct net_device *dev)
-{
- struct frhdr *hdr;
- int process, header;
-
- if (!pskb_may_pull(skb, sizeof(*hdr))) {
- netdev_notice(dev, "invalid data no header\n");
- dev->stats.rx_errors++;
- kfree_skb(skb);
- return;
- }
-
- hdr = (struct frhdr *) skb->data;
- process = 0;
- header = 0;
- skb->dev = dev;
-
- if (hdr->control != FRAD_I_UI)
- {
- netdev_notice(dev, "Invalid header flag 0x%02X\n",
- hdr->control);
- dev->stats.rx_errors++;
- }
- else
- switch (hdr->IP_NLPID)
- {
- case FRAD_P_PADDING:
- if (hdr->NLPID != FRAD_P_SNAP)
- {
- netdev_notice(dev, "Unsupported NLPID 0x%02X\n",
- hdr->NLPID);
- dev->stats.rx_errors++;
- break;
- }
-
- if (hdr->OUI[0] + hdr->OUI[1] + hdr->OUI[2] != 0)
- {
- netdev_notice(dev, "Unsupported organizationally unique identifier 0x%02X-%02X-%02X\n",
- hdr->OUI[0],
- hdr->OUI[1],
- hdr->OUI[2]);
- dev->stats.rx_errors++;
- break;
- }
-
- /* at this point, it's an EtherType frame */
- header = sizeof(struct frhdr);
- /* Already in network order ! */
- skb->protocol = hdr->PID;
- process = 1;
- break;
-
- case FRAD_P_IP:
- header = sizeof(hdr->control) + sizeof(hdr->IP_NLPID);
- skb->protocol = htons(ETH_P_IP);
- process = 1;
- break;
-
- case FRAD_P_SNAP:
- case FRAD_P_Q933:
- case FRAD_P_CLNP:
- netdev_notice(dev, "Unsupported NLPID 0x%02X\n",
- hdr->pad);
- dev->stats.rx_errors++;
- break;
-
- default:
- netdev_notice(dev, "Invalid pad byte 0x%02X\n",
- hdr->pad);
- dev->stats.rx_errors++;
- break;
- }
-
- if (process)
- {
- /* we've set up the protocol, so discard the header */
- skb_reset_mac_header(skb);
- skb_pull(skb, header);
- dev->stats.rx_bytes += skb->len;
- netif_rx(skb);
- dev->stats.rx_packets++;
- }
- else
- dev_kfree_skb(skb);
-}
-
-static netdev_tx_t dlci_transmit(struct sk_buff *skb, struct net_device *dev)
-{
- struct dlci_local *dlp = netdev_priv(dev);
-
- if (skb) {
- struct netdev_queue *txq = skb_get_tx_queue(dev, skb);
- netdev_start_xmit(skb, dlp->slave, txq, false);
- }
- return NETDEV_TX_OK;
-}
-
-static int dlci_config(struct net_device *dev, struct dlci_conf __user *conf, int get)
-{
- struct dlci_conf config;
- struct dlci_local *dlp;
- struct frad_local *flp;
- int err;
-
- dlp = netdev_priv(dev);
-
- flp = netdev_priv(dlp->slave);
-
- if (!get)
- {
- if (copy_from_user(&config, conf, sizeof(struct dlci_conf)))
- return -EFAULT;
- if (config.flags & ~DLCI_VALID_FLAGS)
- return -EINVAL;
- memcpy(&dlp->config, &config, sizeof(struct dlci_conf));
- dlp->configured = 1;
- }
-
- err = (*flp->dlci_conf)(dlp->slave, dev, get);
- if (err)
- return err;
-
- if (get)
- {
- if (copy_to_user(conf, &dlp->config, sizeof(struct dlci_conf)))
- return -EFAULT;
- }
-
- return 0;
-}
-
-static int dlci_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
-{
- struct dlci_local *dlp;
-
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
-
- dlp = netdev_priv(dev);
-
- switch (cmd)
- {
- case DLCI_GET_SLAVE:
- if (!*(short *)(dev->dev_addr))
- return -EINVAL;
-
- strncpy(ifr->ifr_slave, dlp->slave->name, sizeof(ifr->ifr_slave));
- break;
-
- case DLCI_GET_CONF:
- case DLCI_SET_CONF:
- if (!*(short *)(dev->dev_addr))
- return -EINVAL;
-
- return dlci_config(dev, ifr->ifr_data, cmd == DLCI_GET_CONF);
-
- default:
- return -EOPNOTSUPP;
- }
- return 0;
-}
-
-static int dlci_change_mtu(struct net_device *dev, int new_mtu)
-{
- struct dlci_local *dlp = netdev_priv(dev);
-
- return dev_set_mtu(dlp->slave, new_mtu);
-}
-
-static int dlci_open(struct net_device *dev)
-{
- struct dlci_local *dlp;
- struct frad_local *flp;
- int err;
-
- dlp = netdev_priv(dev);
-
- if (!*(short *)(dev->dev_addr))
- return -EINVAL;
-
- if (!netif_running(dlp->slave))
- return -ENOTCONN;
-
- flp = netdev_priv(dlp->slave);
- err = (*flp->activate)(dlp->slave, dev);
- if (err)
- return err;
-
- netif_start_queue(dev);
-
- return 0;
-}
-
-static int dlci_close(struct net_device *dev)
-{
- struct dlci_local *dlp;
- struct frad_local *flp;
-
- netif_stop_queue(dev);
-
- dlp = netdev_priv(dev);
-
- flp = netdev_priv(dlp->slave);
- (*flp->deactivate)(dlp->slave, dev);
-
- return 0;
-}
-
-static int dlci_add(struct dlci_add *dlci)
-{
- struct net_device *master, *slave;
- struct dlci_local *dlp;
- struct frad_local *flp;
- int err = -EINVAL;
-
-
- /* validate slave device */
- slave = dev_get_by_name(&init_net, dlci->devname);
- if (!slave)
- return -ENODEV;
-
- if (slave->type != ARPHRD_FRAD || netdev_priv(slave) == NULL)
- goto err1;
-
- /* create device name */
- master = alloc_netdev(sizeof(struct dlci_local), "dlci%d",
- NET_NAME_UNKNOWN, dlci_setup);
- if (!master) {
- err = -ENOMEM;
- goto err1;
- }
-
- /* make sure same slave not already registered */
- rtnl_lock();
- list_for_each_entry(dlp, &dlci_devs, list) {
- if (dlp->slave == slave) {
- err = -EBUSY;
- goto err2;
- }
- }
-
- *(short *)(master->dev_addr) = dlci->dlci;
-
- dlp = netdev_priv(master);
- dlp->slave = slave;
- dlp->master = master;
-
- flp = netdev_priv(slave);
- err = (*flp->assoc)(slave, master);
- if (err < 0)
- goto err2;
-
- err = register_netdevice(master);
- if (err < 0)
- goto err2;
-
- strcpy(dlci->devname, master->name);
-
- list_add(&dlp->list, &dlci_devs);
- rtnl_unlock();
-
- return 0;
-
- err2:
- rtnl_unlock();
- free_netdev(master);
- err1:
- dev_put(slave);
- return err;
-}
-
-static int dlci_del(struct dlci_add *dlci)
-{
- struct dlci_local *dlp;
- struct frad_local *flp;
- struct net_device *master, *slave;
- int err;
- bool found = false;
-
- rtnl_lock();
-
- /* validate slave device */
- master = __dev_get_by_name(&init_net, dlci->devname);
- if (!master) {
- err = -ENODEV;
- goto out;
- }
-
- list_for_each_entry(dlp, &dlci_devs, list) {
- if (dlp->master == master) {
- found = true;
- break;
- }
- }
- if (!found) {
- err = -ENODEV;
- goto out;
- }
-
- if (netif_running(master)) {
- err = -EBUSY;
- goto out;
- }
-
- dlp = netdev_priv(master);
- slave = dlp->slave;
- flp = netdev_priv(slave);
-
- err = (*flp->deassoc)(slave, master);
- if (!err) {
- list_del(&dlp->list);
-
- unregister_netdevice(master);
-
- dev_put(slave);
- }
-out:
- rtnl_unlock();
- return err;
-}
-
-static int dlci_ioctl(unsigned int cmd, void __user *arg)
-{
- struct dlci_add add;
- int err;
-
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
-
- if (copy_from_user(&add, arg, sizeof(struct dlci_add)))
- return -EFAULT;
-
- switch (cmd)
- {
- case SIOCADDDLCI:
- err = dlci_add(&add);
-
- if (!err)
- if (copy_to_user(arg, &add, sizeof(struct dlci_add)))
- return -EFAULT;
- break;
-
- case SIOCDELDLCI:
- err = dlci_del(&add);
- break;
-
- default:
- err = -EINVAL;
- }
-
- return err;
-}
-
-static const struct header_ops dlci_header_ops = {
- .create = dlci_header,
-};
-
-static const struct net_device_ops dlci_netdev_ops = {
- .ndo_open = dlci_open,
- .ndo_stop = dlci_close,
- .ndo_do_ioctl = dlci_dev_ioctl,
- .ndo_start_xmit = dlci_transmit,
- .ndo_change_mtu = dlci_change_mtu,
-};
-
-static void dlci_setup(struct net_device *dev)
-{
- struct dlci_local *dlp = netdev_priv(dev);
-
- dev->flags = 0;
- dev->header_ops = &dlci_header_ops;
- dev->netdev_ops = &dlci_netdev_ops;
- dev->needs_free_netdev = true;
-
- dlp->receive = dlci_receive;
-
- dev->type = ARPHRD_DLCI;
- dev->hard_header_len = sizeof(struct frhdr);
- dev->addr_len = sizeof(short);
-
-}
-
-/* if slave is unregistering, then cleanup master */
-static int dlci_dev_event(struct notifier_block *unused,
- unsigned long event, void *ptr)
-{
- struct net_device *dev = netdev_notifier_info_to_dev(ptr);
-
- if (dev_net(dev) != &init_net)
- return NOTIFY_DONE;
-
- if (event == NETDEV_UNREGISTER) {
- struct dlci_local *dlp;
-
- list_for_each_entry(dlp, &dlci_devs, list) {
- if (dlp->slave == dev) {
- list_del(&dlp->list);
- unregister_netdevice(dlp->master);
- dev_put(dlp->slave);
- break;
- }
- }
- }
- return NOTIFY_DONE;
-}
-
-static struct notifier_block dlci_notifier = {
- .notifier_call = dlci_dev_event,
-};
-
-static int __init init_dlci(void)
-{
- dlci_ioctl_set(dlci_ioctl);
- register_netdevice_notifier(&dlci_notifier);
-
- printk("%s.\n", version);
-
- return 0;
-}
-
-static void __exit dlci_exit(void)
-{
- struct dlci_local *dlp, *nxt;
-
- dlci_ioctl_set(NULL);
- unregister_netdevice_notifier(&dlci_notifier);
-
- rtnl_lock();
- list_for_each_entry_safe(dlp, nxt, &dlci_devs, list) {
- unregister_netdevice(dlp->master);
- dev_put(dlp->slave);
- }
- rtnl_unlock();
-}
-
-module_init(init_dlci);
-module_exit(dlci_exit);
-
-MODULE_AUTHOR("Mike McLagan");
-MODULE_DESCRIPTION("Frame Relay DLCI layer");
-MODULE_LICENSE("GPL");
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.