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/system.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/rose.h>
38
39static int rose_header(struct sk_buff *skb, struct net_device *dev,
40		       unsigned short type,
41		       const void *daddr, const void *saddr, unsigned len)
42{
43	unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2);
44
45	*buff++ = ROSE_GFI | ROSE_Q_BIT;
46	*buff++ = 0x00;
47	*buff++ = ROSE_DATA;
48	*buff++ = 0x7F;
49	*buff++ = AX25_P_IP;
50
51	if (daddr != NULL)
52		return 37;
53
54	return -37;
55}
56
57static int rose_rebuild_header(struct sk_buff *skb)
58{
59#ifdef CONFIG_INET
60	struct net_device *dev = skb->dev;
61	struct net_device_stats *stats = &dev->stats;
62	unsigned char *bp = (unsigned char *)skb->data;
63	struct sk_buff *skbn;
64	unsigned int len;
65
66	if (arp_find(bp + 7, skb)) {
67		return 1;
68	}
69
70	if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {
71		kfree_skb(skb);
72		return 1;
73	}
74
75	if (skb->sk != NULL)
76		skb_set_owner_w(skbn, skb->sk);
77
78	kfree_skb(skb);
79
80	len = skbn->len;
81
82	if (!rose_route_frame(skbn, NULL)) {
83		kfree_skb(skbn);
84		stats->tx_errors++;
85		return 1;
86	}
87
88	stats->tx_packets++;
89	stats->tx_bytes += len;
90#endif
91	return 1;
92}
93
94static int rose_set_mac_address(struct net_device *dev, void *addr)
95{
96	struct sockaddr *sa = addr;
97	int err;
98
99	if (!memcpy(dev->dev_addr, sa->sa_data, dev->addr_len))
100		return 0;
101
102	if (dev->flags & IFF_UP) {
103		err = rose_add_loopback_node((rose_address *)dev->dev_addr);
104		if (err)
105			return err;
106
107		rose_del_loopback_node((rose_address *)dev->dev_addr);
108	}
109
110	memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
111
112	return 0;
113}
114
115static int rose_open(struct net_device *dev)
116{
117	int err;
118
119	err = rose_add_loopback_node((rose_address *)dev->dev_addr);
120	if (err)
121		return err;
122
123	netif_start_queue(dev);
124
125	return 0;
126}
127
128static int rose_close(struct net_device *dev)
129{
130	netif_stop_queue(dev);
131	rose_del_loopback_node((rose_address *)dev->dev_addr);
132	return 0;
133}
134
135static netdev_tx_t rose_xmit(struct sk_buff *skb, struct net_device *dev)
136{
137	struct net_device_stats *stats = &dev->stats;
138
139	if (!netif_running(dev)) {
140		printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n");
141		return NETDEV_TX_BUSY;
142	}
143	dev_kfree_skb(skb);
144	stats->tx_errors++;
145	return NETDEV_TX_OK;
146}
147
148static const struct header_ops rose_header_ops = {
149	.create	= rose_header,
150	.rebuild= rose_rebuild_header,
151};
152
153static const struct net_device_ops rose_netdev_ops = {
154	.ndo_open		= rose_open,
155	.ndo_stop		= rose_close,
156	.ndo_start_xmit		= rose_xmit,
157	.ndo_set_mac_address    = rose_set_mac_address,
158};
159
160void rose_setup(struct net_device *dev)
161{
162	dev->mtu		= ROSE_MAX_PACKET_SIZE - 2;
163	dev->netdev_ops		= &rose_netdev_ops;
164
165	dev->header_ops		= &rose_header_ops;
166	dev->hard_header_len	= AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN;
167	dev->addr_len		= ROSE_ADDR_LEN;
168	dev->type		= ARPHRD_ROSE;
169
170	/* New-style flags. */
171	dev->flags		= IFF_NOARP;
172}
173