[mirror_ubuntu-bionic-kernel.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/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 = &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 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 LT	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	{
b51414b6	46	struct net_device_stats *stats = &dev->stats;
1da177e4 LT	47
1da177e4 LT	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;
c6e6ca71	60	skb->mac_header = skb->network_header;
c1d2bbe1	61	skb_reset_network_header(skb);
1da177e4 LT	62	skb->pkt_type = PACKET_HOST;
1da177e4 LT	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
3b04ddde SH	99	static int nr_header(struct sk_buff skb, struct net_device dev,
	100	unsigned short type,
	101	const void daddr, const void saddr, unsigned len)
1da177e4 LT	102	{
	103	unsigned char *buff = skb_push(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
	104
	105	memcpy(buff, (saddr != NULL) ? saddr : dev->dev_addr, dev->addr_len);
	106	buff[6] &= ~AX25_CBIT;
	107	buff[6] &= ~AX25_EBIT;
	108	buff[6] \|= AX25_SSSID_SPARE;
	109	buff += AX25_ADDR_LEN;
	110
	111	if (daddr != NULL)
	112	memcpy(buff, daddr, dev->addr_len);
	113	buff[6] &= ~AX25_CBIT;
	114	buff[6] \|= AX25_EBIT;
	115	buff[6] \|= AX25_SSSID_SPARE;
	116	buff += AX25_ADDR_LEN;
	117
	118	*buff++ = sysctl_netrom_network_ttl_initialiser;
	119
	120	*buff++ = NR_PROTO_IP;
	121	*buff++ = NR_PROTO_IP;
	122	*buff++ = 0;
	123	*buff++ = 0;
	124	*buff++ = NR_PROTOEXT;
	125
	126	if (daddr != NULL)
	127	return 37;
	128
	129	return -37;
	130	}
	131
81dcd169	132	static int __must_check nr_set_mac_address(struct net_device dev, void addr)
1da177e4 LT	133	{
1da177e4 LT	134	struct sockaddr *sa = addr;
81dcd169 RB	135	int err;
	136
	137	if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len))
	138	return 0;
	139
	140	if (dev->flags & IFF_UP) {
	141	err = ax25_listen_register((ax25_address *)sa->sa_data, NULL);
	142	if (err)
	143	return err;
1da177e4	144
1da177e4	145	ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
81dcd169	146	}
1da177e4 LT	147
	148	memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
	149
1da177e4 LT	150	return 0;
	151	}
	152
	153	static int nr_open(struct net_device *dev)
	154	{
81dcd169 RB	155	int err;
	156
	157	err = ax25_listen_register((ax25_address *)dev->dev_addr, NULL);
	158	if (err)
	159	return err;
	160
1da177e4	161	netif_start_queue(dev);
81dcd169	162
1da177e4 LT	163	return 0;
	164	}
	165
	166	static int nr_close(struct net_device *dev)
	167	{
	168	ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
	169	netif_stop_queue(dev);
	170	return 0;
	171	}
	172
36e4d64a	173	static netdev_tx_t nr_xmit(struct sk_buff skb, struct net_device dev)
1da177e4	174	{
b51414b6	175	struct net_device_stats *stats = &dev->stats;
b88a762b	176	unsigned int len = skb->len;
3f2aadd0 RB	177
	178	if (!nr_route_frame(skb, NULL)) {
	179	kfree_skb(skb);
	180	stats->tx_errors++;
6ed10654	181	return NETDEV_TX_OK;
3f2aadd0 RB	182	}
	183
	184	stats->tx_packets++;
	185	stats->tx_bytes += len;
	186
6ed10654	187	return NETDEV_TX_OK;
1da177e4 LT	188	}
1da177e4 LT	189
3b04ddde SH	190	static const struct header_ops nr_header_ops = {
	191	.create = nr_header,
	192	.rebuild= nr_rebuild_header,
	193	};
	194
0f6c5c8e SH	195	static const struct net_device_ops nr_netdev_ops = {
	196	.ndo_open = nr_open,
	197	.ndo_stop = nr_close,
	198	.ndo_start_xmit = nr_xmit,
	199	.ndo_set_mac_address = nr_set_mac_address,
	200	};
3b04ddde	201
1da177e4 LT	202	void nr_setup(struct net_device *dev)
1da177e4 LT	203	{
1da177e4	204	dev->mtu = NR_MAX_PACKET_SIZE;
0f6c5c8e	205	dev->netdev_ops = &nr_netdev_ops;
3b04ddde	206	dev->header_ops = &nr_header_ops;
1da177e4 LT	207	dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN;
	208	dev->addr_len = AX25_ADDR_LEN;
	209	dev->type = ARPHRD_NETROM;
1da177e4 LT	210
1da177e4 LT	211	/* New-style flags. */
72377291	212	dev->flags = IFF_NOARP;
1da177e4	213	}