[mirror_ubuntu-jammy-kernel.git] / net / rose / rose_dev.c

// 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;
}
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4	2	/*
1da177e4 LT	3	*
	4	* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
	5	*/
1da177e4 LT	6	#include <linux/module.h>
	7	#include <linux/proc_fs.h>
	8	#include <linux/kernel.h>
1da177e4 LT	9	#include <linux/interrupt.h>
	10	#include <linux/fs.h>
	11	#include <linux/types.h>
	12	#include <linux/sysctl.h>
	13	#include <linux/string.h>
	14	#include <linux/socket.h>
	15	#include <linux/errno.h>
	16	#include <linux/fcntl.h>
	17	#include <linux/in.h>
	18	#include <linux/if_ether.h>
5a0e3ad6	19	#include <linux/slab.h>
1da177e4	20
1da177e4 LT	21	#include <asm/io.h>
	22
	23	#include <linux/inet.h>
	24	#include <linux/netdevice.h>
	25	#include <linux/etherdevice.h>
	26	#include <linux/if_arp.h>
	27	#include <linux/skbuff.h>
	28
	29	#include <net/ip.h>
	30	#include <net/arp.h>
	31
	32	#include <net/ax25.h>
	33	#include <net/rose.h>
	34
3b04ddde SH	35	static int rose_header(struct sk_buff skb, struct net_device dev,
3b04ddde SH	36	unsigned short type,
95c96174	37	const void daddr, const void saddr, unsigned int len)
1da177e4 LT	38	{
	39	unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2);
	40
b753af31 EB	41	if (daddr)
	42	memcpy(buff + 7, daddr, dev->addr_len);
	43
1da177e4 LT	44	*buff++ = ROSE_GFI \| ROSE_Q_BIT;
	45	*buff++ = 0x00;
	46	*buff++ = ROSE_DATA;
	47	*buff++ = 0x7F;
	48	*buff++ = AX25_P_IP;
	49
	50	if (daddr != NULL)
	51	return 37;
	52
	53	return -37;
	54	}
	55
1da177e4 LT	56	static int rose_set_mac_address(struct net_device dev, void addr)
	57	{
	58	struct sockaddr *sa = addr;
a159aaa3	59	int err;
1da177e4	60
81213b5e	61	if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len))
a159aaa3	62	return 0;
1da177e4	63
a159aaa3	64	if (dev->flags & IFF_UP) {
81213b5e	65	err = rose_add_loopback_node((rose_address *)sa->sa_data);
a159aaa3 RB	66	if (err)
	67	return err;
	68
	69	rose_del_loopback_node((rose_address *)dev->dev_addr);
	70	}
1da177e4	71
a159aaa3	72	memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
1da177e4 LT	73
	74	return 0;
	75	}
	76
	77	static int rose_open(struct net_device *dev)
	78	{
a159aaa3 RB	79	int err;
	80
	81	err = rose_add_loopback_node((rose_address *)dev->dev_addr);
	82	if (err)
	83	return err;
	84
1da177e4	85	netif_start_queue(dev);
a159aaa3	86
1da177e4 LT	87	return 0;
	88	}
	89
	90	static int rose_close(struct net_device *dev)
	91	{
	92	netif_stop_queue(dev);
	93	rose_del_loopback_node((rose_address *)dev->dev_addr);
	94	return 0;
	95	}
	96
36e4d64a	97	static netdev_tx_t rose_xmit(struct sk_buff skb, struct net_device dev)
1da177e4	98	{
d289d120	99	struct net_device_stats *stats = &dev->stats;
03ec2ac0	100	unsigned int len = skb->len;
1da177e4 LT	101
	102	if (!netif_running(dev)) {
	103	printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n");
5b548140	104	return NETDEV_TX_BUSY;
1da177e4	105	}
03ec2ac0 EB	106
	107	if (!rose_route_frame(skb, NULL)) {
	108	dev_kfree_skb(skb);
	109	stats->tx_errors++;
	110	return NETDEV_TX_OK;
	111	}
	112
	113	stats->tx_packets++;
	114	stats->tx_bytes += len;
6ed10654	115	return NETDEV_TX_OK;
1da177e4 LT	116	}
1da177e4 LT	117
3b04ddde SH	118	static const struct header_ops rose_header_ops = {
3b04ddde SH	119	.create = rose_header,
3b04ddde SH	120	};
3b04ddde SH	121
3170c656 SH	122	static const struct net_device_ops rose_netdev_ops = {
	123	.ndo_open = rose_open,
	124	.ndo_stop = rose_close,
	125	.ndo_start_xmit = rose_xmit,
	126	.ndo_set_mac_address = rose_set_mac_address,
	127	};
	128
1da177e4 LT	129	void rose_setup(struct net_device *dev)
1da177e4 LT	130	{
1da177e4	131	dev->mtu = ROSE_MAX_PACKET_SIZE - 2;
3170c656	132	dev->netdev_ops = &rose_netdev_ops;
1da177e4	133
3b04ddde	134	dev->header_ops = &rose_header_ops;
1da177e4 LT	135	dev->hard_header_len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN;
	136	dev->addr_len = ROSE_ADDR_LEN;
	137	dev->type = ARPHRD_ROSE;
1da177e4 LT	138
1da177e4 LT	139	/* New-style flags. */
d2ce4bc3	140	dev->flags = IFF_NOARP;
1da177e4	141	}