[linux-2.6-block.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 <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 = &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;
}

#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,
		     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,
	.rebuild= nr_rebuild_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>
1da177e4	23
1da177e4 LT	24	#include <asm/uaccess.h>
	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
98a82feb	68	#ifdef CONFIG_INET
1da177e4 LT	69
	70	static int nr_rebuild_header(struct sk_buff *skb)
	71	{
1da177e4	72	unsigned char *bp = skb->data;
1da177e4	73
3f2aadd0	74	if (arp_find(bp + 7, skb))
1da177e4	75	return 1;
1da177e4 LT	76
	77	bp[6] &= ~AX25_CBIT;
	78	bp[6] &= ~AX25_EBIT;
	79	bp[6] \|= AX25_SSSID_SPARE;
	80	bp += AX25_ADDR_LEN;
	81
	82	bp[6] &= ~AX25_CBIT;
	83	bp[6] \|= AX25_EBIT;
	84	bp[6] \|= AX25_SSSID_SPARE;
	85
3f2aadd0	86	return 0;
1da177e4 LT	87	}
	88
	89	#else
	90
	91	static int nr_rebuild_header(struct sk_buff *skb)
	92	{
	93	return 1;
	94	}
	95
	96	#endif
	97
3b04ddde SH	98	static int nr_header(struct sk_buff skb, struct net_device dev,
3b04ddde SH	99	unsigned short type,
95c96174	100	const void daddr, const void saddr, unsigned int len)
1da177e4 LT	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
81dcd169	131	static int __must_check nr_set_mac_address(struct net_device dev, void addr)
1da177e4 LT	132	{
1da177e4 LT	133	struct sockaddr *sa = addr;
81dcd169 RB	134	int err;
	135
	136	if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len))
	137	return 0;
	138
	139	if (dev->flags & IFF_UP) {
	140	err = ax25_listen_register((ax25_address *)sa->sa_data, NULL);
	141	if (err)
	142	return err;
1da177e4	143
1da177e4	144	ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
81dcd169	145	}
1da177e4 LT	146
	147	memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
	148
1da177e4 LT	149	return 0;
	150	}
	151
	152	static int nr_open(struct net_device *dev)
	153	{
81dcd169 RB	154	int err;
	155
	156	err = ax25_listen_register((ax25_address *)dev->dev_addr, NULL);
	157	if (err)
	158	return err;
	159
1da177e4	160	netif_start_queue(dev);
81dcd169	161
1da177e4 LT	162	return 0;
	163	}
	164
	165	static int nr_close(struct net_device *dev)
	166	{
	167	ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
	168	netif_stop_queue(dev);
	169	return 0;
	170	}
	171
36e4d64a	172	static netdev_tx_t nr_xmit(struct sk_buff skb, struct net_device dev)
1da177e4	173	{
b51414b6	174	struct net_device_stats *stats = &dev->stats;
b88a762b	175	unsigned int len = skb->len;
3f2aadd0 RB	176
	177	if (!nr_route_frame(skb, NULL)) {
	178	kfree_skb(skb);
	179	stats->tx_errors++;
6ed10654	180	return NETDEV_TX_OK;
3f2aadd0 RB	181	}
	182
	183	stats->tx_packets++;
	184	stats->tx_bytes += len;
	185
6ed10654	186	return NETDEV_TX_OK;
1da177e4 LT	187	}
1da177e4 LT	188
3b04ddde SH	189	static const struct header_ops nr_header_ops = {
	190	.create = nr_header,
	191	.rebuild= nr_rebuild_header,
	192	};
	193
0f6c5c8e SH	194	static const struct net_device_ops nr_netdev_ops = {
	195	.ndo_open = nr_open,
	196	.ndo_stop = nr_close,
	197	.ndo_start_xmit = nr_xmit,
	198	.ndo_set_mac_address = nr_set_mac_address,
	199	};
3b04ddde	200
1da177e4 LT	201	void nr_setup(struct net_device *dev)
1da177e4 LT	202	{
1da177e4	203	dev->mtu = NR_MAX_PACKET_SIZE;
0f6c5c8e	204	dev->netdev_ops = &nr_netdev_ops;
3b04ddde	205	dev->header_ops = &nr_header_ops;
1da177e4 LT	206	dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN;
	207	dev->addr_len = AX25_ADDR_LEN;
	208	dev->type = ARPHRD_NETROM;
1da177e4 LT	209
1da177e4 LT	210	/* New-style flags. */
72377291	211	dev->flags = IFF_NOARP;
1da177e4	212	}