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
23#include <asm/system.h>
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, unsigned short type,
39	void *daddr, void *saddr, unsigned len)
40{
41	unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2);
42
43	*buff++ = ROSE_GFI | ROSE_Q_BIT;
44	*buff++ = 0x00;
45	*buff++ = ROSE_DATA;
46	*buff++ = 0x7F;
47	*buff++ = AX25_P_IP;
48
49	if (daddr != NULL)
50		return 37;
51
52	return -37;
53}
54
55static int rose_rebuild_header(struct sk_buff *skb)
56{
57	struct net_device *dev = skb->dev;
58	struct net_device_stats *stats = netdev_priv(dev);
59	unsigned char *bp = (unsigned char *)skb->data;
60	struct sk_buff *skbn;
61	unsigned int len;
62
63#ifdef CONFIG_INET
64	if (arp_find(bp + 7, skb)) {
65		return 1;
66	}
67
68	if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {
69		kfree_skb(skb);
70		return 1;
71	}
72
73	if (skb->sk != NULL)
74		skb_set_owner_w(skbn, skb->sk);
75
76	kfree_skb(skb);
77
78	len = skbn->len;
79
80	if (!rose_route_frame(skbn, NULL)) {
81		kfree_skb(skbn);
82		stats->tx_errors++;
83		return 1;
84	}
85
86	stats->tx_packets++;
87	stats->tx_bytes += len;
88#endif
89	return 1;
90}
91
92static int rose_set_mac_address(struct net_device *dev, void *addr)
93{
94	struct sockaddr *sa = addr;
95	int err;
96
97	if (!memcpy(dev->dev_addr, sa->sa_data, dev->addr_len))
98		return 0;
99
100	if (dev->flags & IFF_UP) {
101		err = rose_add_loopback_node((rose_address *)dev->dev_addr);
102		if (err)
103			return err;
104
105		rose_del_loopback_node((rose_address *)dev->dev_addr);
106	}
107
108	memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
109
110	return 0;
111}
112
113static int rose_open(struct net_device *dev)
114{
115	int err;
116
117	err = rose_add_loopback_node((rose_address *)dev->dev_addr);
118	if (err)
119		return err;
120
121	netif_start_queue(dev);
122
123	return 0;
124}
125
126static int rose_close(struct net_device *dev)
127{
128	netif_stop_queue(dev);
129	rose_del_loopback_node((rose_address *)dev->dev_addr);
130	return 0;
131}
132
133static int rose_xmit(struct sk_buff *skb, struct net_device *dev)
134{
135	struct net_device_stats *stats = netdev_priv(dev);
136
137	if (!netif_running(dev)) {
138		printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n");
139		return 1;
140	}
141	dev_kfree_skb(skb);
142	stats->tx_errors++;
143	return 0;
144}
145
146static struct net_device_stats *rose_get_stats(struct net_device *dev)
147{
148	return netdev_priv(dev);
149}
150
151void rose_setup(struct net_device *dev)
152{
153	dev->mtu		= ROSE_MAX_PACKET_SIZE - 2;
154	dev->hard_start_xmit	= rose_xmit;
155	dev->open		= rose_open;
156	dev->stop		= rose_close;
157
158	dev->hard_header	= rose_header;
159	dev->hard_header_len	= AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN;
160	dev->addr_len		= ROSE_ADDR_LEN;
161	dev->type		= ARPHRD_ROSE;
162	dev->rebuild_header	= rose_rebuild_header;
163	dev->set_mac_address    = rose_set_mac_address;
164
165	/* New-style flags. */
166	dev->flags		= IFF_NOARP;
167	dev->get_stats = rose_get_stats;
168}
169