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 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> /* For the statistics structure. */
24
25#include <asm/system.h>
26#include <asm/uaccess.h>
27#include <asm/io.h>
28
29#include <linux/inet.h>
30#include <linux/netdevice.h>
31#include <linux/etherdevice.h>
32#include <linux/if_arp.h>
33#include <linux/skbuff.h>
34
35#include <net/ip.h>
36#include <net/arp.h>
37
38#include <net/ax25.h>
39#include <net/netrom.h>
40
41/*
42 * Only allow IP over NET/ROM frames through if the netrom device is up.
43 */
44
45int nr_rx_ip(struct sk_buff *skb, struct net_device *dev)
46{
47 struct net_device_stats *stats = netdev_priv(dev);
48
49 if (!netif_running(dev)) {
50 stats->rx_dropped++;
51 return 0;
52 }
53
54 stats->rx_packets++;
55 stats->rx_bytes += skb->len;
56
57 skb->protocol = htons(ETH_P_IP);
58
59 /* Spoof incoming device */
60 skb->dev = dev;
61 skb->mac.raw = skb->nh.raw;
62 skb->nh.raw = skb->data;
63 skb->pkt_type = PACKET_HOST;
64
65 netif_rx(skb);
66
67 return 1;
68}
69
70#ifdef CONFIG_INET
71
72static int nr_rebuild_header(struct sk_buff *skb)
73{
74 unsigned char *bp = skb->data;
75
76 if (arp_find(bp + 7, skb))
77 return 1;
78
79 bp[6] &= ~AX25_CBIT;
80 bp[6] &= ~AX25_EBIT;
81 bp[6] |= AX25_SSSID_SPARE;
82 bp += AX25_ADDR_LEN;
83
84 bp[6] &= ~AX25_CBIT;
85 bp[6] |= AX25_EBIT;
86 bp[6] |= AX25_SSSID_SPARE;
87
88 return 0;
89}
90
91#else
92
93static int nr_rebuild_header(struct sk_buff *skb)
94{
95 return 1;
96}
97
98#endif
99
100static int nr_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
101 void *daddr, void *saddr, unsigned len)
102{
103 unsigned char *buff = skb_push(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
104
105 memcpy(buff, (saddr != NULL) ? saddr : dev->dev_addr, dev->addr_len);
106 buff[6] &= ~AX25_CBIT;
107 buff[6] &= ~AX25_EBIT;
108 buff[6] |= AX25_SSSID_SPARE;
109 buff += AX25_ADDR_LEN;
110
111 if (daddr != NULL)
112 memcpy(buff, daddr, dev->addr_len);
113 buff[6] &= ~AX25_CBIT;
114 buff[6] |= AX25_EBIT;
115 buff[6] |= AX25_SSSID_SPARE;
116 buff += AX25_ADDR_LEN;
117
118 *buff++ = sysctl_netrom_network_ttl_initialiser;
119
120 *buff++ = NR_PROTO_IP;
121 *buff++ = NR_PROTO_IP;
122 *buff++ = 0;
123 *buff++ = 0;
124 *buff++ = NR_PROTOEXT;
125
126 if (daddr != NULL)
127 return 37;
128
129 return -37;
130}
131
132static int nr_set_mac_address(struct net_device *dev, void *addr)
133{
134 struct sockaddr *sa = addr;
135
136 if (dev->flags & IFF_UP)
137 ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
138
139 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
140
141 if (dev->flags & IFF_UP)
142 ax25_listen_register((ax25_address *)dev->dev_addr, NULL);
143
144 return 0;
145}
146
147static int nr_open(struct net_device *dev)
148{
149 netif_start_queue(dev);
150 ax25_listen_register((ax25_address *)dev->dev_addr, NULL);
151 return 0;
152}
153
154static int nr_close(struct net_device *dev)
155{
156 ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
157 netif_stop_queue(dev);
158 return 0;
159}
160
161static int nr_xmit(struct sk_buff *skb, struct net_device *dev)
162{
163 struct nr_private *nr = netdev_priv(dev);
164 struct net_device_stats *stats = &nr->stats;
165 unsigned int len = skb->len;
166
167 if (!nr_route_frame(skb, NULL)) {
168 kfree_skb(skb);
169 stats->tx_errors++;
170 return 0;
171 }
172
173 stats->tx_packets++;
174 stats->tx_bytes += len;
175
176 return 0;
177}
178
179static struct net_device_stats *nr_get_stats(struct net_device *dev)
180{
181 struct nr_private *nr = netdev_priv(dev);
182
183 return &nr->stats;
184}
185
186void nr_setup(struct net_device *dev)
187{
188 SET_MODULE_OWNER(dev);
189 dev->mtu = NR_MAX_PACKET_SIZE;
190 dev->hard_start_xmit = nr_xmit;
191 dev->open = nr_open;
192 dev->stop = nr_close;
193
194 dev->hard_header = nr_header;
195 dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN;
196 dev->addr_len = AX25_ADDR_LEN;
197 dev->type = ARPHRD_NETROM;
198 dev->rebuild_header = nr_rebuild_header;
199 dev->set_mac_address = nr_set_mac_address;
200
201 /* New-style flags. */
202 dev->flags = IFF_NOARP;
203
204 dev->get_stats = nr_get_stats;
205}