![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
567 lines
11 KiB
C
567 lines
11 KiB
C
/*
|
|
* 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
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/config.h> /* for CONFIG_DLCI_COUNT */
|
|
#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/system.h>
|
|
#include <asm/io.h>
|
|
#include <asm/dma.h>
|
|
#include <asm/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, void *daddr, void *saddr,
|
|
unsigned len)
|
|
{
|
|
struct frhdr hdr;
|
|
struct dlci_local *dlp;
|
|
unsigned int hlen;
|
|
char *dest;
|
|
|
|
dlp = dev->priv;
|
|
|
|
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 dlci_local *dlp;
|
|
struct frhdr *hdr;
|
|
int process, header;
|
|
|
|
dlp = dev->priv;
|
|
if (!pskb_may_pull(skb, sizeof(*hdr))) {
|
|
printk(KERN_NOTICE "%s: invalid data no header\n",
|
|
dev->name);
|
|
dlp->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)
|
|
{
|
|
printk(KERN_NOTICE "%s: Invalid header flag 0x%02X.\n", dev->name, hdr->control);
|
|
dlp->stats.rx_errors++;
|
|
}
|
|
else
|
|
switch(hdr->IP_NLPID)
|
|
{
|
|
case FRAD_P_PADDING:
|
|
if (hdr->NLPID != FRAD_P_SNAP)
|
|
{
|
|
printk(KERN_NOTICE "%s: Unsupported NLPID 0x%02X.\n", dev->name, hdr->NLPID);
|
|
dlp->stats.rx_errors++;
|
|
break;
|
|
}
|
|
|
|
if (hdr->OUI[0] + hdr->OUI[1] + hdr->OUI[2] != 0)
|
|
{
|
|
printk(KERN_NOTICE "%s: Unsupported organizationally unique identifier 0x%02X-%02X-%02X.\n", dev->name, hdr->OUI[0], hdr->OUI[1], hdr->OUI[2]);
|
|
dlp->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:
|
|
printk(KERN_NOTICE "%s: Unsupported NLPID 0x%02X.\n", dev->name, hdr->pad);
|
|
dlp->stats.rx_errors++;
|
|
break;
|
|
|
|
default:
|
|
printk(KERN_NOTICE "%s: Invalid pad byte 0x%02X.\n", dev->name, hdr->pad);
|
|
dlp->stats.rx_errors++;
|
|
break;
|
|
}
|
|
|
|
if (process)
|
|
{
|
|
/* we've set up the protocol, so discard the header */
|
|
skb->mac.raw = skb->data;
|
|
skb_pull(skb, header);
|
|
dlp->stats.rx_bytes += skb->len;
|
|
netif_rx(skb);
|
|
dlp->stats.rx_packets++;
|
|
dev->last_rx = jiffies;
|
|
}
|
|
else
|
|
dev_kfree_skb(skb);
|
|
}
|
|
|
|
static int dlci_transmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct dlci_local *dlp;
|
|
int ret;
|
|
|
|
ret = 0;
|
|
|
|
if (!skb || !dev)
|
|
return(0);
|
|
|
|
dlp = dev->priv;
|
|
|
|
netif_stop_queue(dev);
|
|
|
|
ret = dlp->slave->hard_start_xmit(skb, dlp->slave);
|
|
switch (ret)
|
|
{
|
|
case DLCI_RET_OK:
|
|
dlp->stats.tx_packets++;
|
|
ret = 0;
|
|
break;
|
|
case DLCI_RET_ERR:
|
|
dlp->stats.tx_errors++;
|
|
ret = 0;
|
|
break;
|
|
case DLCI_RET_DROP:
|
|
dlp->stats.tx_dropped++;
|
|
ret = 1;
|
|
break;
|
|
}
|
|
/* Alan Cox recommends always returning 0, and always freeing the packet */
|
|
/* experience suggest a slightly more conservative approach */
|
|
|
|
if (!ret)
|
|
{
|
|
dev_kfree_skb(skb);
|
|
netif_wake_queue(dev);
|
|
}
|
|
return(ret);
|
|
}
|
|
|
|
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 = dev->priv;
|
|
|
|
flp = dlp->slave->priv;
|
|
|
|
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 = dev->priv;
|
|
|
|
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));
|
|
break;
|
|
|
|
default:
|
|
return(-EOPNOTSUPP);
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
static int dlci_change_mtu(struct net_device *dev, int new_mtu)
|
|
{
|
|
struct dlci_local *dlp;
|
|
|
|
dlp = dev->priv;
|
|
|
|
return((*dlp->slave->change_mtu)(dlp->slave, new_mtu));
|
|
}
|
|
|
|
static int dlci_open(struct net_device *dev)
|
|
{
|
|
struct dlci_local *dlp;
|
|
struct frad_local *flp;
|
|
int err;
|
|
|
|
dlp = dev->priv;
|
|
|
|
if (!*(short *)(dev->dev_addr))
|
|
return(-EINVAL);
|
|
|
|
if (!netif_running(dlp->slave))
|
|
return(-ENOTCONN);
|
|
|
|
flp = dlp->slave->priv;
|
|
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;
|
|
int err;
|
|
|
|
netif_stop_queue(dev);
|
|
|
|
dlp = dev->priv;
|
|
|
|
flp = dlp->slave->priv;
|
|
err = (*flp->deactivate)(dlp->slave, dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct net_device_stats *dlci_get_stats(struct net_device *dev)
|
|
{
|
|
struct dlci_local *dlp;
|
|
|
|
dlp = dev->priv;
|
|
|
|
return(&dlp->stats);
|
|
}
|
|
|
|
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(dlci->devname);
|
|
if (!slave)
|
|
return -ENODEV;
|
|
|
|
if (slave->type != ARPHRD_FRAD || slave->priv == NULL)
|
|
goto err1;
|
|
|
|
/* create device name */
|
|
master = alloc_netdev( sizeof(struct dlci_local), "dlci%d",
|
|
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;
|
|
}
|
|
}
|
|
|
|
err = dev_alloc_name(master, master->name);
|
|
if (err < 0)
|
|
goto err2;
|
|
|
|
*(short *)(master->dev_addr) = dlci->dlci;
|
|
|
|
dlp = (struct dlci_local *) master->priv;
|
|
dlp->slave = slave;
|
|
dlp->master = master;
|
|
|
|
flp = slave->priv;
|
|
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;
|
|
|
|
/* validate slave device */
|
|
master = __dev_get_by_name(dlci->devname);
|
|
if (!master)
|
|
return(-ENODEV);
|
|
|
|
if (netif_running(master)) {
|
|
return(-EBUSY);
|
|
}
|
|
|
|
dlp = master->priv;
|
|
slave = dlp->slave;
|
|
flp = slave->priv;
|
|
|
|
rtnl_lock();
|
|
err = (*flp->deassoc)(slave, master);
|
|
if (!err) {
|
|
list_del(&dlp->list);
|
|
|
|
unregister_netdevice(master);
|
|
|
|
dev_put(slave);
|
|
}
|
|
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 void dlci_setup(struct net_device *dev)
|
|
{
|
|
struct dlci_local *dlp = dev->priv;
|
|
|
|
dev->flags = 0;
|
|
dev->open = dlci_open;
|
|
dev->stop = dlci_close;
|
|
dev->do_ioctl = dlci_dev_ioctl;
|
|
dev->hard_start_xmit = dlci_transmit;
|
|
dev->hard_header = dlci_header;
|
|
dev->get_stats = dlci_get_stats;
|
|
dev->change_mtu = dlci_change_mtu;
|
|
dev->destructor = free_netdev;
|
|
|
|
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 = (struct net_device *) ptr;
|
|
|
|
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");
|