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/config.h>
10 #include <linux/module.h>
11 #include <linux/proc_fs.h>
12 #include <linux/kernel.h>
13 #include <linux/sched.h>
14 #include <linux/interrupt.h>
15 #include <linux/fs.h>
16 #include <linux/types.h>
17 #include <linux/sysctl.h>
18 #include <linux/string.h>
19 #include <linux/socket.h>
20 #include <linux/errno.h>
21 #include <linux/fcntl.h>
22 #include <linux/in.h>
23 #include <linux/if_ether.h>
24
25 #include <asm/system.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/rose.h>
39
40 static int rose_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
41 void *daddr, 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
57 static int rose_rebuild_header(struct sk_buff *skb)
58 {
59 struct net_device *dev = skb->dev;
60 struct net_device_stats *stats = netdev_priv(dev);
61 unsigned char *bp = (unsigned char *)skb->data;
62 struct sk_buff *skbn;
63
64 #ifdef CONFIG_INET
65 if (arp_find(bp + 7, skb)) {
66 return 1;
67 }
68
69 if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {
70 kfree_skb(skb);
71 return 1;
72 }
73
74 if (skb->sk != NULL)
75 skb_set_owner_w(skbn, skb->sk);
76
77 kfree_skb(skb);
78
79 if (!rose_route_frame(skbn, NULL)) {
80 kfree_skb(skbn);
81 stats->tx_errors++;
82 return 1;
83 }
84
85 stats->tx_packets++;
86 stats->tx_bytes += skbn->len;
87 #endif
88 return 1;
89 }
90
91 static int rose_set_mac_address(struct net_device *dev, void *addr)
92 {
93 struct sockaddr *sa = addr;
94
95 rose_del_loopback_node((rose_address *)dev->dev_addr);
96
97 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
98
99 rose_add_loopback_node((rose_address *)dev->dev_addr);
100
101 return 0;
102 }
103
104 static int rose_open(struct net_device *dev)
105 {
106 netif_start_queue(dev);
107 rose_add_loopback_node((rose_address *)dev->dev_addr);
108 return 0;
109 }
110
111 static int rose_close(struct net_device *dev)
112 {
113 netif_stop_queue(dev);
114 rose_del_loopback_node((rose_address *)dev->dev_addr);
115 return 0;
116 }
117
118 static int rose_xmit(struct sk_buff *skb, struct net_device *dev)
119 {
120 struct net_device_stats *stats = netdev_priv(dev);
121
122 if (!netif_running(dev)) {
123 printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n");
124 return 1;
125 }
126 dev_kfree_skb(skb);
127 stats->tx_errors++;
128 return 0;
129 }
130
131 static struct net_device_stats *rose_get_stats(struct net_device *dev)
132 {
133 return netdev_priv(dev);
134 }
135
136 void rose_setup(struct net_device *dev)
137 {
138 SET_MODULE_OWNER(dev);
139 dev->mtu = ROSE_MAX_PACKET_SIZE - 2;
140 dev->hard_start_xmit = rose_xmit;
141 dev->open = rose_open;
142 dev->stop = rose_close;
143
144 dev->hard_header = rose_header;
145 dev->hard_header_len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN;
146 dev->addr_len = ROSE_ADDR_LEN;
147 dev->type = ARPHRD_ROSE;
148 dev->rebuild_header = rose_rebuild_header;
149 dev->set_mac_address = rose_set_mac_address;
150
151 /* New-style flags. */
152 dev->flags = 0;
153 dev->get_stats = rose_get_stats;
154 }
155
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