/* * 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 (C) 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> #include <asm/system.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/rose.h> static int rose_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,	void *daddr, void *saddr, unsigned len){	unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2); 	*buff++ = ROSE_GFI | ROSE_Q_BIT;	*buff++ = 0x00;	*buff++ = ROSE_DATA;	*buff++ = 0x7F;	*buff++ = AX25_P_IP; 	if (daddr != NULL)		return 37; 	return -37;} static int rose_rebuild_header(struct sk_buff *skb){	struct net_device *dev = skb->dev;	struct net_device_stats *stats = netdev_priv(dev);	unsigned char *bp = (unsigned char *)skb->data;	struct sk_buff *skbn; #ifdef CONFIG_INET	if (arp_find(bp + 7, skb)) {		return 1;	} 	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); 	if (!rose_route_frame(skbn, NULL)) {		kfree_skb(skbn);		stats->tx_errors++;		return 1;	} 	stats->tx_packets++;	stats->tx_bytes += skbn->len;#endif	return 1;} static int rose_set_mac_address(struct net_device *dev, void *addr){	struct sockaddr *sa = addr; 	rose_del_loopback_node((rose_address *)dev->dev_addr); 	memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); 	rose_add_loopback_node((rose_address *)dev->dev_addr); 	return 0;} static int rose_open(struct net_device *dev){	netif_start_queue(dev);	rose_add_loopback_node((rose_address *)dev->dev_addr);	return 0;} static int rose_close(struct net_device *dev){	netif_stop_queue(dev);	rose_del_loopback_node((rose_address *)dev->dev_addr);	return 0;} static int rose_xmit(struct sk_buff *skb, struct net_device *dev){	struct net_device_stats *stats = netdev_priv(dev); 	if (!netif_running(dev)) {		printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n");		return 1;	}	dev_kfree_skb(skb);	stats->tx_errors++;	return 0;} static struct net_device_stats *rose_get_stats(struct net_device *dev){	return netdev_priv(dev);} void rose_setup(struct net_device *dev){	dev->mtu		= ROSE_MAX_PACKET_SIZE - 2;	dev->hard_start_xmit	= rose_xmit;	dev->open		= rose_open;	dev->stop		= rose_close; 	dev->hard_header	= rose_header;	dev->hard_header_len	= AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN;	dev->addr_len		= ROSE_ADDR_LEN;	dev->type		= ARPHRD_ROSE;	dev->rebuild_header	= rose_rebuild_header;	dev->set_mac_address    = rose_set_mac_address; 	/* New-style flags. */	dev->flags		= IFF_NOARP;	dev->get_stats = rose_get_stats;}