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/*
* 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.
*
* Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/sysctl.h>
#include <linux/string.h>
#include <linux/socket.h>
#include <linux/errno.h>
#include <linux/fcntl.h>
#include <linux/in.h>
#include <linux/if_ether.h> /* For the statistics structure. */
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
#include <net/ip.h>
#include <net/arp.h>
#include <net/ax25.h>
#include <net/netrom.h>
#ifdef CONFIG_INET
/*
* Only allow IP over NET/ROM frames through if the netrom device is up.
*/
int nr_rx_ip(struct sk_buff *skb, struct net_device *dev)
{
struct net_device_stats *stats = netdev_priv(dev);
if (!netif_running(dev)) {
stats->rx_errors++;
return 0;
}
stats->rx_packets++;
stats->rx_bytes += skb->len;
skb->protocol = htons(ETH_P_IP);
/* Spoof incoming device */
skb->dev = dev;
skb->h.raw = skb->data;
skb->nh.raw = skb->data;
skb->pkt_type = PACKET_HOST;
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return 1;
}
static int nr_rebuild_header(struct sk_buff *skb)
{
struct net_device *dev = skb->dev;
struct net_device_stats *stats = netdev_priv(dev);
struct sk_buff *skbn;
unsigned char *bp = skb->data;
int len;
if (arp_find(bp + 7, skb)) {
return 1;
}
bp[6] &= ~AX25_CBIT;
bp[6] &= ~AX25_EBIT;
bp[6] |= AX25_SSSID_SPARE;
bp += AX25_ADDR_LEN;
bp[6] &= ~AX25_CBIT;
bp[6] |= AX25_EBIT;
bp[6] |= AX25_SSSID_SPARE;
if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {
kfree_skb(skb);
return 1;
}
if (skb->sk != NULL)
skb_set_owner_w(skbn, skb->sk);
kfree_skb(skb);
len = skbn->len;
if (!nr_route_frame(skbn, NULL)) {
kfree_skb(skbn);
stats->tx_errors++;
}
stats->tx_packets++;
stats->tx_bytes += len;
return 1;
}
#else
static int nr_rebuild_header(struct sk_buff *skb)
{
return 1;
}
#endif
static int nr_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
void *daddr, void *saddr, unsigned len)
{
unsigned char *buff = skb_push(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
memcpy(buff, (saddr != NULL) ? saddr : dev->dev_addr, dev->addr_len);
buff[6] &= ~AX25_CBIT;
buff[6] &= ~AX25_EBIT;
buff[6] |= AX25_SSSID_SPARE;
buff += AX25_ADDR_LEN;
if (daddr != NULL)
memcpy(buff, daddr, dev->addr_len);
buff[6] &= ~AX25_CBIT;
buff[6] |= AX25_EBIT;
buff[6] |= AX25_SSSID_SPARE;
buff += AX25_ADDR_LEN;
*buff++ = sysctl_netrom_network_ttl_initialiser;
*buff++ = NR_PROTO_IP;
*buff++ = NR_PROTO_IP;
*buff++ = 0;
*buff++ = 0;
*buff++ = NR_PROTOEXT;
if (daddr != NULL)
return 37;
return -37;
}
static int nr_set_mac_address(struct net_device *dev, void *addr)
{
struct sockaddr *sa = addr;
if (dev->flags & IFF_UP)
ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
if (dev->flags & IFF_UP)
ax25_listen_register((ax25_address *)dev->dev_addr, NULL);
return 0;
}
static int nr_open(struct net_device *dev)
{
netif_start_queue(dev);
ax25_listen_register((ax25_address *)dev->dev_addr, NULL);
return 0;
}
static int nr_close(struct net_device *dev)
{
ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
netif_stop_queue(dev);
return 0;
}
static int nr_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct net_device_stats *stats = netdev_priv(dev);
dev_kfree_skb(skb);
stats->tx_errors++;
return 0;
}
static struct net_device_stats *nr_get_stats(struct net_device *dev)
{
return netdev_priv(dev);
}
void nr_setup(struct net_device *dev)
{
SET_MODULE_OWNER(dev);
dev->mtu = NR_MAX_PACKET_SIZE;
dev->hard_start_xmit = nr_xmit;
dev->open = nr_open;
dev->stop = nr_close;
dev->hard_header = nr_header;
dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN;
dev->addr_len = AX25_ADDR_LEN;
dev->type = ARPHRD_NETROM;
dev->tx_queue_len = 40;
dev->rebuild_header = nr_rebuild_header;
dev->set_mac_address = nr_set_mac_address;
/* New-style flags. */
dev->flags = 0;
dev->get_stats = nr_get_stats;
}