[linux-block.git] / net / netrom / nr_dev.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *
 * Copyright 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>	/* For the statistics structure. */
#include <linux/slab.h>
#include <linux/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>

/*
 *	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 = &dev->stats;

	if (!netif_running(dev)) {
		stats->rx_dropped++;
		return 0;
	}

	stats->rx_packets++;
	stats->rx_bytes += skb->len;

	skb->protocol = htons(ETH_P_IP);

	/* Spoof incoming device */
	skb->dev      = dev;
	skb->mac_header = skb->network_header;
	skb_reset_network_header(skb);
	skb->pkt_type = PACKET_HOST;

	netif_rx(skb);

	return 1;
}

static int nr_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, 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 __must_check nr_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 = ax25_listen_register((ax25_address *)sa->sa_data, NULL);
		if (err)
			return err;

		ax25_listen_release((const ax25_address *)dev->dev_addr, NULL);
	}

	dev_addr_set(dev, sa->sa_data);

	return 0;
}

static int nr_open(struct net_device *dev)
{
	int err;

	err = ax25_listen_register((const ax25_address *)dev->dev_addr, NULL);
	if (err)
		return err;

	netif_start_queue(dev);

	return 0;
}

static int nr_close(struct net_device *dev)
{
	ax25_listen_release((const ax25_address *)dev->dev_addr, NULL);
	netif_stop_queue(dev);
	return 0;
}

static netdev_tx_t nr_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct net_device_stats *stats = &dev->stats;
	unsigned int len = skb->len;

	if (!nr_route_frame(skb, NULL)) {
		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 nr_header_ops = {
	.create	= nr_header,
};

static const struct net_device_ops nr_netdev_ops = {
	.ndo_open		= nr_open,
	.ndo_stop		= nr_close,
	.ndo_start_xmit		= nr_xmit,
	.ndo_set_mac_address    = nr_set_mac_address,
};

void nr_setup(struct net_device *dev)
{
	dev->mtu		= NR_MAX_PACKET_SIZE;
	dev->netdev_ops		= &nr_netdev_ops;
	dev->header_ops		= &nr_header_ops;
	dev->hard_header_len	= NR_NETWORK_LEN + NR_TRANSPORT_LEN;
	dev->addr_len		= AX25_ADDR_LEN;
	dev->type		= ARPHRD_NETROM;

	/* 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 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> /* For the statistics structure. */
5a0e3ad6	19	#include <linux/slab.h>
dc8e5416	20	#include <linux/uaccess.h>
1da177e4	21
1da177e4 LT	22	#include <asm/io.h>
	23
	24	#include <linux/inet.h>
	25	#include <linux/netdevice.h>
	26	#include <linux/etherdevice.h>
	27	#include <linux/if_arp.h>
	28	#include <linux/skbuff.h>
	29
	30	#include <net/ip.h>
	31	#include <net/arp.h>
	32
	33	#include <net/ax25.h>
	34	#include <net/netrom.h>
	35
1da177e4 LT	36	/*
	37	* Only allow IP over NET/ROM frames through if the netrom device is up.
	38	*/
	39
	40	int nr_rx_ip(struct sk_buff skb, struct net_device dev)
	41	{
b51414b6	42	struct net_device_stats *stats = &dev->stats;
1da177e4 LT	43
1da177e4 LT	44	if (!netif_running(dev)) {
6ddcf626	45	stats->rx_dropped++;
1da177e4 LT	46	return 0;
	47	}
	48
	49	stats->rx_packets++;
	50	stats->rx_bytes += skb->len;
	51
	52	skb->protocol = htons(ETH_P_IP);
	53
	54	/* Spoof incoming device */
	55	skb->dev = dev;
c6e6ca71	56	skb->mac_header = skb->network_header;
c1d2bbe1	57	skb_reset_network_header(skb);
1da177e4 LT	58	skb->pkt_type = PACKET_HOST;
1da177e4 LT	59
98a82feb	60	netif_rx(skb);
1da177e4 LT	61
	62	return 1;
	63	}
	64
3b04ddde SH	65	static int nr_header(struct sk_buff skb, struct net_device dev,
3b04ddde SH	66	unsigned short type,
95c96174	67	const void daddr, const void saddr, unsigned int len)
1da177e4 LT	68	{
	69	unsigned char *buff = skb_push(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
	70
	71	memcpy(buff, (saddr != NULL) ? saddr : dev->dev_addr, dev->addr_len);
	72	buff[6] &= ~AX25_CBIT;
	73	buff[6] &= ~AX25_EBIT;
	74	buff[6] \|= AX25_SSSID_SPARE;
	75	buff += AX25_ADDR_LEN;
	76
	77	if (daddr != NULL)
	78	memcpy(buff, daddr, dev->addr_len);
	79	buff[6] &= ~AX25_CBIT;
	80	buff[6] \|= AX25_EBIT;
	81	buff[6] \|= AX25_SSSID_SPARE;
	82	buff += AX25_ADDR_LEN;
	83
	84	*buff++ = sysctl_netrom_network_ttl_initialiser;
	85
	86	*buff++ = NR_PROTO_IP;
	87	*buff++ = NR_PROTO_IP;
	88	*buff++ = 0;
	89	*buff++ = 0;
	90	*buff++ = NR_PROTOEXT;
	91
	92	if (daddr != NULL)
	93	return 37;
	94
	95	return -37;
	96	}
	97
81dcd169	98	static int __must_check nr_set_mac_address(struct net_device dev, void addr)
1da177e4 LT	99	{
1da177e4 LT	100	struct sockaddr *sa = addr;
81dcd169 RB	101	int err;
	102
	103	if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len))
	104	return 0;
	105
	106	if (dev->flags & IFF_UP) {
	107	err = ax25_listen_register((ax25_address *)sa->sa_data, NULL);
	108	if (err)
	109	return err;
1da177e4	110
c045ad2c	111	ax25_listen_release((const ax25_address *)dev->dev_addr, NULL);
81dcd169	112	}
1da177e4	113
ea52a0b5	114	dev_addr_set(dev, sa->sa_data);
1da177e4	115
1da177e4 LT	116	return 0;
	117	}
	118
	119	static int nr_open(struct net_device *dev)
	120	{
81dcd169 RB	121	int err;
81dcd169 RB	122
c045ad2c	123	err = ax25_listen_register((const ax25_address *)dev->dev_addr, NULL);
81dcd169 RB	124	if (err)
	125	return err;
	126
1da177e4	127	netif_start_queue(dev);
81dcd169	128
1da177e4 LT	129	return 0;
	130	}
	131
	132	static int nr_close(struct net_device *dev)
	133	{
c045ad2c	134	ax25_listen_release((const ax25_address *)dev->dev_addr, NULL);
1da177e4 LT	135	netif_stop_queue(dev);
	136	return 0;
	137	}
	138
36e4d64a	139	static netdev_tx_t nr_xmit(struct sk_buff skb, struct net_device dev)
1da177e4	140	{
b51414b6	141	struct net_device_stats *stats = &dev->stats;
b88a762b	142	unsigned int len = skb->len;
3f2aadd0 RB	143
	144	if (!nr_route_frame(skb, NULL)) {
	145	kfree_skb(skb);
	146	stats->tx_errors++;
6ed10654	147	return NETDEV_TX_OK;
3f2aadd0 RB	148	}
	149
	150	stats->tx_packets++;
	151	stats->tx_bytes += len;
	152
6ed10654	153	return NETDEV_TX_OK;
1da177e4 LT	154	}
1da177e4 LT	155
3b04ddde SH	156	static const struct header_ops nr_header_ops = {
3b04ddde SH	157	.create = nr_header,
3b04ddde SH	158	};
3b04ddde SH	159
0f6c5c8e SH	160	static const struct net_device_ops nr_netdev_ops = {
	161	.ndo_open = nr_open,
	162	.ndo_stop = nr_close,
	163	.ndo_start_xmit = nr_xmit,
	164	.ndo_set_mac_address = nr_set_mac_address,
	165	};
3b04ddde	166
1da177e4 LT	167	void nr_setup(struct net_device *dev)
1da177e4 LT	168	{
1da177e4	169	dev->mtu = NR_MAX_PACKET_SIZE;
0f6c5c8e	170	dev->netdev_ops = &nr_netdev_ops;
3b04ddde	171	dev->header_ops = &nr_header_ops;
1da177e4 LT	172	dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN;
	173	dev->addr_len = AX25_ADDR_LEN;
	174	dev->type = ARPHRD_NETROM;
1da177e4 LT	175
1da177e4 LT	176	/* New-style flags. */
72377291	177	dev->flags = IFF_NOARP;
1da177e4	178	}