[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 ([email protected])
 */
#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 <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_reset_mac_header(skb);
	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,
	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 __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 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 ([email protected])
	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. */
	22
	23	#include <asm/system.h>
	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	{
	45	struct net_device_stats *stats = netdev_priv(dev);
	46
	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;
459a98ed	59	skb_reset_mac_header(skb);
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
	98	static int nr_header(struct sk_buff skb, struct net_device dev, unsigned short type,
	99	void daddr, void saddr, unsigned len)
	100	{
	101	unsigned char *buff = skb_push(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
	102
	103	memcpy(buff, (saddr != NULL) ? saddr : dev->dev_addr, dev->addr_len);
	104	buff[6] &= ~AX25_CBIT;
	105	buff[6] &= ~AX25_EBIT;
	106	buff[6] \|= AX25_SSSID_SPARE;
	107	buff += AX25_ADDR_LEN;
	108
	109	if (daddr != NULL)
	110	memcpy(buff, daddr, dev->addr_len);
	111	buff[6] &= ~AX25_CBIT;
	112	buff[6] \|= AX25_EBIT;
	113	buff[6] \|= AX25_SSSID_SPARE;
	114	buff += AX25_ADDR_LEN;
	115
	116	*buff++ = sysctl_netrom_network_ttl_initialiser;
	117
	118	*buff++ = NR_PROTO_IP;
	119	*buff++ = NR_PROTO_IP;
	120	*buff++ = 0;
	121	*buff++ = 0;
	122	*buff++ = NR_PROTOEXT;
	123
	124	if (daddr != NULL)
	125	return 37;
	126
	127	return -37;
	128	}
	129
81dcd169	130	static int __must_check nr_set_mac_address(struct net_device dev, void addr)
1da177e4 LT	131	{
1da177e4 LT	132	struct sockaddr *sa = addr;
81dcd169 RB	133	int err;
	134
	135	if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len))
	136	return 0;
	137
	138	if (dev->flags & IFF_UP) {
	139	err = ax25_listen_register((ax25_address *)sa->sa_data, NULL);
	140	if (err)
	141	return err;
1da177e4	142
1da177e4	143	ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
81dcd169	144	}
1da177e4 LT	145
	146	memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
	147
1da177e4 LT	148	return 0;
	149	}
	150
	151	static int nr_open(struct net_device *dev)
	152	{
81dcd169 RB	153	int err;
	154
	155	err = ax25_listen_register((ax25_address *)dev->dev_addr, NULL);
	156	if (err)
	157	return err;
	158
1da177e4	159	netif_start_queue(dev);
81dcd169	160
1da177e4 LT	161	return 0;
	162	}
	163
	164	static int nr_close(struct net_device *dev)
	165	{
	166	ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
	167	netif_stop_queue(dev);
	168	return 0;
	169	}
	170
	171	static int nr_xmit(struct sk_buff skb, struct net_device dev)
	172	{
b88a762b RB	173	struct nr_private *nr = netdev_priv(dev);
	174	struct net_device_stats *stats = &nr->stats;
	175	unsigned int len = skb->len;
3f2aadd0 RB	176
	177	if (!nr_route_frame(skb, NULL)) {
	178	kfree_skb(skb);
	179	stats->tx_errors++;
	180	return 0;
	181	}
	182
	183	stats->tx_packets++;
	184	stats->tx_bytes += len;
	185
1da177e4 LT	186	return 0;
	187	}
	188
	189	static struct net_device_stats nr_get_stats(struct net_device dev)
	190	{
b88a762b RB	191	struct nr_private *nr = netdev_priv(dev);
	192
	193	return &nr->stats;
1da177e4 LT	194	}
	195
	196	void nr_setup(struct net_device *dev)
	197	{
1da177e4 LT	198	dev->mtu = NR_MAX_PACKET_SIZE;
	199	dev->hard_start_xmit = nr_xmit;
	200	dev->open = nr_open;
	201	dev->stop = nr_close;
	202
	203	dev->hard_header = nr_header;
	204	dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN;
	205	dev->addr_len = AX25_ADDR_LEN;
	206	dev->type = ARPHRD_NETROM;
1da177e4 LT	207	dev->rebuild_header = nr_rebuild_header;
	208	dev->set_mac_address = nr_set_mac_address;
	209
	210	/* New-style flags. */
72377291	211	dev->flags = IFF_NOARP;
1da177e4 LT	212
	213	dev->get_stats = nr_get_stats;
	214	}