[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/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>	/* For the statistics structure. */

#include <asm/system.h>
#include <asm/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 = netdev_priv(dev);

	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.raw  = skb->nh.raw;
	skb->nh.raw   = skb->data;
	skb->pkt_type = PACKET_HOST;

	netif_rx(skb);

	return 1;
}

#ifdef CONFIG_INET

static int nr_rebuild_header(struct sk_buff *skb)
{
	unsigned char *bp = skb->data;

	if (arp_find(bp + 7, skb))
		return 1;

	bp[6] &= ~AX25_CBIT;
	bp[6] &= ~AX25_EBIT;
	bp[6] |= AX25_SSSID_SPARE;
	bp    += AX25_ADDR_LEN;

	bp[6] &= ~AX25_CBIT;
	bp[6] |= AX25_EBIT;
	bp[6] |= AX25_SSSID_SPARE;

	return 0;
}

#else

static int nr_rebuild_header(struct sk_buff *skb)
{
	return 1;
}

#endif

static int nr_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
	void *daddr, void *saddr, unsigned 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 nr_set_mac_address(struct net_device *dev, void *addr)
{
	struct sockaddr *sa = addr;

	if (dev->flags & IFF_UP)
		ax25_listen_release((ax25_address *)dev->dev_addr, NULL);

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

	if (dev->flags & IFF_UP)
		ax25_listen_register((ax25_address *)dev->dev_addr, NULL);

	return 0;
}

static int nr_open(struct net_device *dev)
{
	netif_start_queue(dev);
	ax25_listen_register((ax25_address *)dev->dev_addr, NULL);
	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 int nr_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct nr_private *nr = netdev_priv(dev);
	struct net_device_stats *stats = &nr->stats;
	unsigned int len = skb->len;

	if (!nr_route_frame(skb, NULL)) {
		kfree_skb(skb);
		stats->tx_errors++;
		return 0;
	}

	stats->tx_packets++;
	stats->tx_bytes += len;

	return 0;
}

static struct net_device_stats *nr_get_stats(struct net_device *dev)
{
	struct nr_private *nr = netdev_priv(dev);

	return &nr->stats;
}

void nr_setup(struct net_device *dev)
{
	dev->mtu		= NR_MAX_PACKET_SIZE;
	dev->hard_start_xmit	= nr_xmit;
	dev->open		= nr_open;
	dev->stop		= nr_close;

	dev->hard_header	= nr_header;
	dev->hard_header_len	= NR_NETWORK_LEN + NR_TRANSPORT_LEN;
	dev->addr_len		= AX25_ADDR_LEN;
	dev->type		= ARPHRD_NETROM;
	dev->rebuild_header	= nr_rebuild_header;
	dev->set_mac_address    = nr_set_mac_address;

	/* New-style flags. */
	dev->flags		= IFF_NOARP;

	dev->get_stats 		= nr_get_stats;
}
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>
	12	#include <linux/sched.h>
	13	#include <linux/interrupt.h>
	14	#include <linux/fs.h>
	15	#include <linux/types.h>
	16	#include <linux/sysctl.h>
	17	#include <linux/string.h>
	18	#include <linux/socket.h>
	19	#include <linux/errno.h>
	20	#include <linux/fcntl.h>
	21	#include <linux/in.h>
	22	#include <linux/if_ether.h> /* For the statistics structure. */
	23
	24	#include <asm/system.h>
	25	#include <asm/uaccess.h>
	26	#include <asm/io.h>
	27
	28	#include <linux/inet.h>
	29	#include <linux/netdevice.h>
	30	#include <linux/etherdevice.h>
	31	#include <linux/if_arp.h>
	32	#include <linux/skbuff.h>
	33
	34	#include <net/ip.h>
	35	#include <net/arp.h>
	36
	37	#include <net/ax25.h>
	38	#include <net/netrom.h>
	39
1da177e4 LT	40	/*
	41	* Only allow IP over NET/ROM frames through if the netrom device is up.
	42	*/
	43
	44	int nr_rx_ip(struct sk_buff skb, struct net_device dev)
	45	{
	46	struct net_device_stats *stats = netdev_priv(dev);
	47
	48	if (!netif_running(dev)) {
6ddcf626	49	stats->rx_dropped++;
1da177e4 LT	50	return 0;
	51	}
	52
	53	stats->rx_packets++;
	54	stats->rx_bytes += skb->len;
	55
	56	skb->protocol = htons(ETH_P_IP);
	57
	58	/* Spoof incoming device */
	59	skb->dev = dev;
3a867b36	60	skb->mac.raw = skb->nh.raw;
1da177e4 LT	61	skb->nh.raw = skb->data;
	62	skb->pkt_type = PACKET_HOST;
	63
98a82feb	64	netif_rx(skb);
1da177e4 LT	65
	66	return 1;
	67	}
	68
98a82feb	69	#ifdef CONFIG_INET
1da177e4 LT	70
	71	static int nr_rebuild_header(struct sk_buff *skb)
	72	{
1da177e4	73	unsigned char *bp = skb->data;
1da177e4	74
3f2aadd0	75	if (arp_find(bp + 7, skb))
1da177e4	76	return 1;
1da177e4 LT	77
	78	bp[6] &= ~AX25_CBIT;
	79	bp[6] &= ~AX25_EBIT;
	80	bp[6] \|= AX25_SSSID_SPARE;
	81	bp += AX25_ADDR_LEN;
	82
	83	bp[6] &= ~AX25_CBIT;
	84	bp[6] \|= AX25_EBIT;
	85	bp[6] \|= AX25_SSSID_SPARE;
	86
3f2aadd0	87	return 0;
1da177e4 LT	88	}
	89
	90	#else
	91
	92	static int nr_rebuild_header(struct sk_buff *skb)
	93	{
	94	return 1;
	95	}
	96
	97	#endif
	98
	99	static int nr_header(struct sk_buff skb, struct net_device dev, unsigned short type,
	100	void daddr, void saddr, unsigned len)
	101	{
	102	unsigned char *buff = skb_push(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
	103
	104	memcpy(buff, (saddr != NULL) ? saddr : dev->dev_addr, dev->addr_len);
	105	buff[6] &= ~AX25_CBIT;
	106	buff[6] &= ~AX25_EBIT;
	107	buff[6] \|= AX25_SSSID_SPARE;
	108	buff += AX25_ADDR_LEN;
	109
	110	if (daddr != NULL)
	111	memcpy(buff, daddr, dev->addr_len);
	112	buff[6] &= ~AX25_CBIT;
	113	buff[6] \|= AX25_EBIT;
	114	buff[6] \|= AX25_SSSID_SPARE;
	115	buff += AX25_ADDR_LEN;
	116
	117	*buff++ = sysctl_netrom_network_ttl_initialiser;
	118
	119	*buff++ = NR_PROTO_IP;
	120	*buff++ = NR_PROTO_IP;
	121	*buff++ = 0;
	122	*buff++ = 0;
	123	*buff++ = NR_PROTOEXT;
	124
	125	if (daddr != NULL)
	126	return 37;
	127
	128	return -37;
	129	}
	130
	131	static int nr_set_mac_address(struct net_device dev, void addr)
	132	{
	133	struct sockaddr *sa = addr;
	134
	135	if (dev->flags & IFF_UP)
	136	ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
	137
	138	memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
	139
	140	if (dev->flags & IFF_UP)
	141	ax25_listen_register((ax25_address *)dev->dev_addr, NULL);
	142
	143	return 0;
	144	}
	145
	146	static int nr_open(struct net_device *dev)
	147	{
	148	netif_start_queue(dev);
	149	ax25_listen_register((ax25_address *)dev->dev_addr, NULL);
	150	return 0;
	151	}
152
153	static int nr_close(struct net_device *dev)
154	{
155	ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
156	netif_stop_queue(dev);
157	return 0;
158	}
159
160	static int nr_xmit(struct sk_buff skb, struct net_device dev)
161	{
b88a762b RB	162	struct nr_private *nr = netdev_priv(dev);
	163	struct net_device_stats *stats = &nr->stats;
	164	unsigned int len = skb->len;
3f2aadd0 RB	165
	166	if (!nr_route_frame(skb, NULL)) {
	167	kfree_skb(skb);
	168	stats->tx_errors++;
	169	return 0;
	170	}
	171
	172	stats->tx_packets++;
	173	stats->tx_bytes += len;
	174
1da177e4 LT	175	return 0;
	176	}
	177
	178	static struct net_device_stats nr_get_stats(struct net_device dev)
	179	{
b88a762b RB	180	struct nr_private *nr = netdev_priv(dev);
	181
	182	return &nr->stats;
1da177e4 LT	183	}
	184
	185	void nr_setup(struct net_device *dev)
	186	{
1da177e4 LT	187	dev->mtu = NR_MAX_PACKET_SIZE;
	188	dev->hard_start_xmit = nr_xmit;
	189	dev->open = nr_open;
	190	dev->stop = nr_close;
	191
	192	dev->hard_header = nr_header;
	193	dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN;
	194	dev->addr_len = AX25_ADDR_LEN;
	195	dev->type = ARPHRD_NETROM;
1da177e4 LT	196	dev->rebuild_header = nr_rebuild_header;
	197	dev->set_mac_address = nr_set_mac_address;
	198
	199	/* New-style flags. */
72377291	200	dev->flags = IFF_NOARP;
1da177e4 LT	201
	202	dev->get_stats = nr_get_stats;
	203	}