// SPDX-License-Identifier: GPL-2.0-or-later/* * * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) */#include <linux/module.h>#include <linux/proc_fs.h>#include <linux/kernel.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 <linux/slab.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,		       const void *daddr, const void *saddr, unsigned int len){	unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2); 	if (daddr)		memcpy(buff + 7, daddr, dev->addr_len); 	*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_set_mac_address(struct net_device *dev, void *addr){	struct sockaddr *sa = addr;	int err; 	if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len))		return 0; 	if (dev->flags & IFF_UP) {		err = rose_add_loopback_node((rose_address *)sa->sa_data);		if (err)			return err; 		rose_del_loopback_node((rose_address *)dev->dev_addr);	} 	memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); 	return 0;} static int rose_open(struct net_device *dev){	int err; 	err = rose_add_loopback_node((rose_address *)dev->dev_addr);	if (err)		return err; 	netif_start_queue(dev); 	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 netdev_tx_t rose_xmit(struct sk_buff *skb, struct net_device *dev){	struct net_device_stats *stats = &dev->stats;	unsigned int len = skb->len; 	if (!netif_running(dev)) {		printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n");		return NETDEV_TX_BUSY;	} 	if (!rose_route_frame(skb, NULL)) {		dev_kfree_skb(skb);		stats->tx_errors++;		return NETDEV_TX_OK;	} 	stats->tx_packets++;	stats->tx_bytes += len;	return NETDEV_TX_OK;} static const struct header_ops rose_header_ops = {	.create	= rose_header,}; static const struct net_device_ops rose_netdev_ops = {	.ndo_open		= rose_open,	.ndo_stop		= rose_close,	.ndo_start_xmit		= rose_xmit,	.ndo_set_mac_address    = rose_set_mac_address,}; void rose_setup(struct net_device *dev){	dev->mtu		= ROSE_MAX_PACKET_SIZE - 2;	dev->netdev_ops		= &rose_netdev_ops; 	dev->header_ops		= &rose_header_ops;	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; 	/* New-style flags. */	dev->flags		= IFF_NOARP;}