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/*
* 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.
*/
#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:
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