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/*
* NET/ROM release 002
*
* This is ALPHA test software. This code may break your machine, randomly fail to work with new
* releases, misbehave and/or generally screw up. It might even work.
*
* This code REQUIRES 1.3.0 or higher/ NET3.029
*
* This module:
* This module 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.
*
* History
* NET/ROM 001 Jonathan(G4KLX) Cloned from loopback.c
*/
#include <linux/config.h>
#ifdef CONFIG_NETROM
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/fs.h>
#include <linux/types.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/segment.h>
#include <asm/io.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <net/ip.h>
#include <net/arp.h>
#include <net/ax25.h>
#include <net/netrom.h>
/*
* Only allow IP over NET/ROM frames through if the netrom device is up.
*/
int nr_rx_ip(struct sk_buff *skb, struct device *dev)
{
struct enet_statistics *stats = (struct enet_statistics *)dev->priv;
if (!dev->start) {
stats->rx_errors++;
return 0;
}
stats->rx_packets++;
skb->protocol=htons(ETH_P_IP);
/* Spoof incoming device */
skb->dev=dev;
ip_rcv(skb, dev, NULL);
return 1;
}
/*
* We can't handle ARP so put some identification characters into the ARP
* packet so that the transmit routine can identify it, and throw it away.
*/
static int nr_header(unsigned char *buff, struct device *dev, unsigned short type,
void *daddr, void *saddr, unsigned len, struct sk_buff *skb)
{
if (type == ETH_P_ARP) {
*buff++ = 0xFF; /* Mark it */
*buff++ = 0xFE;
return 37;
}
buff += 16;
*buff++ = AX25_P_NETROM;
memcpy(buff, (saddr != NULL) ? saddr : dev->dev_addr, dev->addr_len);
buff[6] &= ~LAPB_C;
buff[6] &= ~LAPB_E;
buff[6] |= SSID_SPARE;
buff += dev->addr_len;
if (daddr != NULL)
memcpy(buff, daddr, dev->addr_len);
buff[6] &= ~LAPB_C;
buff[6] |= LAPB_E;
buff[6] |= SSID_SPARE;
buff += dev->addr_len;
*buff++ = nr_default.ttl;
*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_rebuild_header(void *buff, struct device *dev,
unsigned long raddr, struct sk_buff *skb)
{
unsigned char *bp = (unsigned char *)buff;
if (arp_find(bp + 24, raddr, dev, dev->pa_addr, skb))
return 1;
bp[23] &= ~LAPB_C;
bp[23] &= ~LAPB_E;
bp[23] |= SSID_SPARE;
bp[30] &= ~LAPB_C;
bp[30] |= LAPB_E;
bp[30] |= SSID_SPARE;
return 0;
}
static int nr_set_mac_address(struct device *dev, void *addr)
{
memcpy(dev->dev_addr, addr, dev->addr_len);
return 0;
}
static int nr_open(struct device *dev)
{
dev->tbusy = 0;
dev->start = 1;
return 0;
}
static int nr_close(struct device *dev)
{
dev->tbusy = 1;
dev->start = 0;
return 0;
}
static int nr_xmit(struct sk_buff *skb, struct device *dev)
{
struct enet_statistics *stats = (struct enet_statistics *)dev->priv;
struct sk_buff *skbn;
if (skb == NULL || dev == NULL)
return 0;
if (!dev->start) {
printk("netrom: xmit call when iface is down\n");
return 1;
}
cli();
if (dev->tbusy != 0) {
sti();
stats->tx_errors++;
return 1;
}
dev->tbusy = 1;
sti();
if (skb->data[0] != 0xFF && skb->data[1] != 0xFE) {
if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {
dev->tbusy = 0;
stats->tx_errors++;
return 1;
}
if (!nr_route_frame(skbn, NULL)) {
skbn->free = 1;
kfree_skb(skbn, FREE_WRITE);
dev->tbusy = 0;
stats->tx_errors++;
return 1;
}
}
dev_kfree_skb(skb, FREE_WRITE);
stats->tx_packets++;
dev->tbusy = 0;
mark_bh(NET_BH);
return 0;
}
static struct enet_statistics *nr_get_stats(struct device *dev)
{
return (struct enet_statistics *)dev->priv;
}
int nr_init(struct device *dev)
{
int i;
dev->mtu = 236; /* MTU */
dev->tbusy = 0;
dev->hard_start_xmit = nr_xmit;
dev->open = nr_open;
dev->stop = nr_close;
dev->hard_header = nr_header;
dev->hard_header_len = 37;
dev->addr_len = 7;
dev->type = ARPHRD_NETROM;
dev->rebuild_header = nr_rebuild_header;
dev->set_mac_address = nr_set_mac_address;
/* New-style flags. */
dev->flags = 0;
dev->family = AF_INET;
dev->pa_addr = 0;
dev->pa_brdaddr = 0;
dev->pa_mask = 0;
dev->pa_alen = sizeof(unsigned long);
dev->priv = kmalloc(sizeof(struct enet_statistics), GFP_KERNEL);
memset(dev->priv, 0, sizeof(struct enet_statistics));
dev->get_stats = nr_get_stats;
/* Fill in the generic fields of the device structure. */
for (i = 0; i < DEV_NUMBUFFS; i++)
skb_queue_head_init(&dev->buffs[i]);
return 0;
};
#endif
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