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 (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
8 */
9#include <linux/module.h>
10#include <linux/proc_fs.h>
11#include <linux/kernel.h>
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>
22#include <linux/slab.h>
23
24#include <asm/io.h>
25
26#include <linux/inet.h>
27#include <linux/netdevice.h>
28#include <linux/etherdevice.h>
29#include <linux/if_arp.h>
30#include <linux/skbuff.h>
31
32#include <net/ip.h>
33#include <net/arp.h>
34
35#include <net/ax25.h>
36#include <net/rose.h>
37
38static int rose_header(struct sk_buff *skb, struct net_device *dev,
39		       unsigned short type,
40		       const void *daddr, const void *saddr, unsigned int len)
41{
42	unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2);
43
44	if (daddr)
45		memcpy(buff + 7, daddr, dev->addr_len);
46
47	*buff++ = ROSE_GFI | ROSE_Q_BIT;
48	*buff++ = 0x00;
49	*buff++ = ROSE_DATA;
50	*buff++ = 0x7F;
51	*buff++ = AX25_P_IP;
52
53	if (daddr != NULL)
54		return 37;
55
56	return -37;
57}
58
59static int rose_set_mac_address(struct net_device *dev, void *addr)
60{
61	struct sockaddr *sa = addr;
62	int err;
63
64	if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len))
65		return 0;
66
67	if (dev->flags & IFF_UP) {
68		err = rose_add_loopback_node((rose_address *)sa->sa_data);
69		if (err)
70			return err;
71
72		rose_del_loopback_node((rose_address *)dev->dev_addr);
73	}
74
75	memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
76
77	return 0;
78}
79
80static int rose_open(struct net_device *dev)
81{
82	int err;
83
84	err = rose_add_loopback_node((rose_address *)dev->dev_addr);
85	if (err)
86		return err;
87
88	netif_start_queue(dev);
89
90	return 0;
91}
92
93static int rose_close(struct net_device *dev)
94{
95	netif_stop_queue(dev);
96	rose_del_loopback_node((rose_address *)dev->dev_addr);
97	return 0;
98}
99
100static netdev_tx_t rose_xmit(struct sk_buff *skb, struct net_device *dev)
101{
102	struct net_device_stats *stats = &dev->stats;
103	unsigned int len = skb->len;
104
105	if (!netif_running(dev)) {
106		printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n");
107		return NETDEV_TX_BUSY;
108	}
109
110	if (!rose_route_frame(skb, NULL)) {
111		dev_kfree_skb(skb);
112		stats->tx_errors++;
113		return NETDEV_TX_OK;
114	}
115
116	stats->tx_packets++;
117	stats->tx_bytes += len;
118	return NETDEV_TX_OK;
119}
120
121static const struct header_ops rose_header_ops = {
122	.create	= rose_header,
123};
124
125static const struct net_device_ops rose_netdev_ops = {
126	.ndo_open		= rose_open,
127	.ndo_stop		= rose_close,
128	.ndo_start_xmit		= rose_xmit,
129	.ndo_set_mac_address    = rose_set_mac_address,
130};
131
132void rose_setup(struct net_device *dev)
133{
134	dev->mtu		= ROSE_MAX_PACKET_SIZE - 2;
135	dev->netdev_ops		= &rose_netdev_ops;
136
137	dev->header_ops		= &rose_header_ops;
138	dev->hard_header_len	= AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN;
139	dev->addr_len		= ROSE_ADDR_LEN;
140	dev->type		= ARPHRD_ROSE;
141
142	/* New-style flags. */
143	dev->flags		= IFF_NOARP;
144}
145