[deliverable/linux.git] / net / netrom / nr_dev.c

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

	memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);

	return 0;
}

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

	err = ax25_listen_register((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((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
1da177e4 LT	1	/*
	2	* This program is free software; you can redistribute it and/or modify
	3	* it under the terms of the GNU General Public License as published by
	4	* the Free Software Foundation; either version 2 of the License, or
	5	* (at your option) any later version.
	6	*
	7	* Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
	8	*/
1da177e4 LT	9	#include <linux/module.h>
	10	#include <linux/proc_fs.h>
	11	#include <linux/kernel.h>
1da177e4 LT	12	#include <linux/interrupt.h>
	13	#include <linux/fs.h>
	14	#include <linux/types.h>
	15	#include <linux/sysctl.h>
	16	#include <linux/string.h>
	17	#include <linux/socket.h>
	18	#include <linux/errno.h>
	19	#include <linux/fcntl.h>
	20	#include <linux/in.h>
	21	#include <linux/if_ether.h> /* For the statistics structure. */
5a0e3ad6	22	#include <linux/slab.h>
dc8e5416	23	#include <linux/uaccess.h>
1da177e4	24
1da177e4 LT	25	#include <asm/io.h>
	26
	27	#include <linux/inet.h>
	28	#include <linux/netdevice.h>
	29	#include <linux/etherdevice.h>
	30	#include <linux/if_arp.h>
	31	#include <linux/skbuff.h>
	32
	33	#include <net/ip.h>
	34	#include <net/arp.h>
	35
	36	#include <net/ax25.h>
	37	#include <net/netrom.h>
	38
1da177e4 LT	39	/*
	40	* Only allow IP over NET/ROM frames through if the netrom device is up.
	41	*/
	42
	43	int nr_rx_ip(struct sk_buff skb, struct net_device dev)
	44	{
b51414b6	45	struct net_device_stats *stats = &dev->stats;
1da177e4 LT	46
1da177e4 LT	47	if (!netif_running(dev)) {
6ddcf626	48	stats->rx_dropped++;
1da177e4 LT	49	return 0;
	50	}
	51
	52	stats->rx_packets++;
	53	stats->rx_bytes += skb->len;
	54
	55	skb->protocol = htons(ETH_P_IP);
	56
	57	/* Spoof incoming device */
	58	skb->dev = dev;
c6e6ca71	59	skb->mac_header = skb->network_header;
c1d2bbe1	60	skb_reset_network_header(skb);
1da177e4 LT	61	skb->pkt_type = PACKET_HOST;
1da177e4 LT	62
98a82feb	63	netif_rx(skb);
1da177e4 LT	64
	65	return 1;
	66	}
	67
3b04ddde SH	68	static int nr_header(struct sk_buff skb, struct net_device dev,
3b04ddde SH	69	unsigned short type,
95c96174	70	const void daddr, const void saddr, unsigned int len)
1da177e4 LT	71	{
	72	unsigned char *buff = skb_push(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
	73
	74	memcpy(buff, (saddr != NULL) ? saddr : dev->dev_addr, dev->addr_len);
	75	buff[6] &= ~AX25_CBIT;
	76	buff[6] &= ~AX25_EBIT;
	77	buff[6] \|= AX25_SSSID_SPARE;
	78	buff += AX25_ADDR_LEN;
	79
	80	if (daddr != NULL)
	81	memcpy(buff, daddr, dev->addr_len);
	82	buff[6] &= ~AX25_CBIT;
	83	buff[6] \|= AX25_EBIT;
	84	buff[6] \|= AX25_SSSID_SPARE;
	85	buff += AX25_ADDR_LEN;
	86
	87	*buff++ = sysctl_netrom_network_ttl_initialiser;
	88
	89	*buff++ = NR_PROTO_IP;
	90	*buff++ = NR_PROTO_IP;
	91	*buff++ = 0;
	92	*buff++ = 0;
	93	*buff++ = NR_PROTOEXT;
	94
	95	if (daddr != NULL)
	96	return 37;
	97
	98	return -37;
	99	}
	100
81dcd169	101	static int __must_check nr_set_mac_address(struct net_device dev, void addr)
1da177e4 LT	102	{
1da177e4 LT	103	struct sockaddr *sa = addr;
81dcd169 RB	104	int err;
	105
	106	if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len))
	107	return 0;
	108
	109	if (dev->flags & IFF_UP) {
	110	err = ax25_listen_register((ax25_address *)sa->sa_data, NULL);
	111	if (err)
	112	return err;
1da177e4	113
1da177e4	114	ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
81dcd169	115	}
1da177e4 LT	116
	117	memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
	118
1da177e4 LT	119	return 0;
	120	}
	121
	122	static int nr_open(struct net_device *dev)
	123	{
81dcd169 RB	124	int err;
	125
	126	err = ax25_listen_register((ax25_address *)dev->dev_addr, NULL);
	127	if (err)
	128	return err;
	129
1da177e4	130	netif_start_queue(dev);
81dcd169	131
1da177e4 LT	132	return 0;
	133	}
	134
	135	static int nr_close(struct net_device *dev)
	136	{
	137	ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
	138	netif_stop_queue(dev);
	139	return 0;
	140	}
	141
36e4d64a	142	static netdev_tx_t nr_xmit(struct sk_buff skb, struct net_device dev)
1da177e4	143	{
b51414b6	144	struct net_device_stats *stats = &dev->stats;
b88a762b	145	unsigned int len = skb->len;
3f2aadd0 RB	146
	147	if (!nr_route_frame(skb, NULL)) {
	148	kfree_skb(skb);
	149	stats->tx_errors++;
6ed10654	150	return NETDEV_TX_OK;
3f2aadd0 RB	151	}
	152
	153	stats->tx_packets++;
	154	stats->tx_bytes += len;
	155
6ed10654	156	return NETDEV_TX_OK;
1da177e4 LT	157	}
1da177e4 LT	158
3b04ddde SH	159	static const struct header_ops nr_header_ops = {
3b04ddde SH	160	.create = nr_header,
3b04ddde SH	161	};
3b04ddde SH	162
0f6c5c8e SH	163	static const struct net_device_ops nr_netdev_ops = {
	164	.ndo_open = nr_open,
	165	.ndo_stop = nr_close,
	166	.ndo_start_xmit = nr_xmit,
	167	.ndo_set_mac_address = nr_set_mac_address,
	168	};
3b04ddde	169
1da177e4 LT	170	void nr_setup(struct net_device *dev)
1da177e4 LT	171	{
1da177e4	172	dev->mtu = NR_MAX_PACKET_SIZE;
0f6c5c8e	173	dev->netdev_ops = &nr_netdev_ops;
3b04ddde	174	dev->header_ops = &nr_header_ops;
1da177e4 LT	175	dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN;
	176	dev->addr_len = AX25_ADDR_LEN;
	177	dev->type = ARPHRD_NETROM;
1da177e4 LT	178
1da177e4 LT	179	/* New-style flags. */
72377291	180	dev->flags = IFF_NOARP;
1da177e4	181	}