Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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/sched.h>
13#include <linux/interrupt.h>
14#include <linux/fs.h>
15#include <linux/types.h>
16#include <linux/sysctl.h>
17#include <linux/string.h>
18#include <linux/socket.h>
19#include <linux/errno.h>
20#include <linux/fcntl.h>
21#include <linux/in.h>
22#include <linux/if_ether.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, unsigned short type,
40 void *daddr, void *saddr, unsigned len)
41{
42 unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2);
43
44 *buff++ = ROSE_GFI | ROSE_Q_BIT;
45 *buff++ = 0x00;
46 *buff++ = ROSE_DATA;
47 *buff++ = 0x7F;
48 *buff++ = AX25_P_IP;
49
50 if (daddr != NULL)
51 return 37;
52
53 return -37;
54}
55
56static int rose_rebuild_header(struct sk_buff *skb)
57{
58 struct net_device *dev = skb->dev;
59 struct net_device_stats *stats = netdev_priv(dev);
60 unsigned char *bp = (unsigned char *)skb->data;
61 struct sk_buff *skbn;
62 unsigned int len;
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 len = skbn->len;
80
81 if (!rose_route_frame(skbn, NULL)) {
82 kfree_skb(skbn);
83 stats->tx_errors++;
84 return 1;
85 }
86
87 stats->tx_packets++;
88 stats->tx_bytes += len;
89#endif
90 return 1;
91}
92
93static int rose_set_mac_address(struct net_device *dev, void *addr)
94{
95 struct sockaddr *sa = addr;
96
97 rose_del_loopback_node((rose_address *)dev->dev_addr);
98
99 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
100
101 rose_add_loopback_node((rose_address *)dev->dev_addr);
102
103 return 0;
104}
105
106static int rose_open(struct net_device *dev)
107{
108 netif_start_queue(dev);
109 rose_add_loopback_node((rose_address *)dev->dev_addr);
110 return 0;
111}
112
113static int rose_close(struct net_device *dev)
114{
115 netif_stop_queue(dev);
116 rose_del_loopback_node((rose_address *)dev->dev_addr);
117 return 0;
118}
119
120static int rose_xmit(struct sk_buff *skb, struct net_device *dev)
121{
122 struct net_device_stats *stats = netdev_priv(dev);
123
124 if (!netif_running(dev)) {
125 printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n");
126 return 1;
127 }
128 dev_kfree_skb(skb);
129 stats->tx_errors++;
130 return 0;
131}
132
133static struct net_device_stats *rose_get_stats(struct net_device *dev)
134{
135 return netdev_priv(dev);
136}
137
138void rose_setup(struct net_device *dev)
139{
140 dev->mtu = ROSE_MAX_PACKET_SIZE - 2;
141 dev->hard_start_xmit = rose_xmit;
142 dev->open = rose_open;
143 dev->stop = rose_close;
144
145 dev->hard_header = rose_header;
146 dev->hard_header_len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN;
147 dev->addr_len = ROSE_ADDR_LEN;
148 dev->type = ARPHRD_ROSE;
149 dev->rebuild_header = rose_rebuild_header;
150 dev->set_mac_address = rose_set_mac_address;
151
152 /* New-style flags. */
153 dev->flags = IFF_NOARP;
154 dev->get_stats = rose_get_stats;
155}