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-rw-r--r--net/netrom/nr_dev.c220
1 files changed, 220 insertions, 0 deletions
diff --git a/net/netrom/nr_dev.c b/net/netrom/nr_dev.c
new file mode 100644
index 000000000000..220bf7494f71
--- /dev/null
+++ b/net/netrom/nr_dev.c
@@ -0,0 +1,220 @@
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#ifdef CONFIG_INET
42
43/*
44 * Only allow IP over NET/ROM frames through if the netrom device is up.
45 */
46
47int nr_rx_ip(struct sk_buff *skb, struct net_device *dev)
48{
49 struct net_device_stats *stats = netdev_priv(dev);
50
51 if (!netif_running(dev)) {
52 stats->rx_errors++;
53 return 0;
54 }
55
56 stats->rx_packets++;
57 stats->rx_bytes += skb->len;
58
59 skb->protocol = htons(ETH_P_IP);
60
61 /* Spoof incoming device */
62 skb->dev = dev;
63 skb->h.raw = skb->data;
64 skb->nh.raw = skb->data;
65 skb->pkt_type = PACKET_HOST;
66
67 ip_rcv(skb, skb->dev, NULL);
68
69 return 1;
70}
71
72
73static int nr_rebuild_header(struct sk_buff *skb)
74{
75 struct net_device *dev = skb->dev;
76 struct net_device_stats *stats = netdev_priv(dev);
77 struct sk_buff *skbn;
78 unsigned char *bp = skb->data;
79 int len;
80
81 if (arp_find(bp + 7, skb)) {
82 return 1;
83 }
84
85 bp[6] &= ~AX25_CBIT;
86 bp[6] &= ~AX25_EBIT;
87 bp[6] |= AX25_SSSID_SPARE;
88 bp += AX25_ADDR_LEN;
89
90 bp[6] &= ~AX25_CBIT;
91 bp[6] |= AX25_EBIT;
92 bp[6] |= AX25_SSSID_SPARE;
93
94 if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {
95 kfree_skb(skb);
96 return 1;
97 }
98
99 if (skb->sk != NULL)
100 skb_set_owner_w(skbn, skb->sk);
101
102 kfree_skb(skb);
103
104 len = skbn->len;
105
106 if (!nr_route_frame(skbn, NULL)) {
107 kfree_skb(skbn);
108 stats->tx_errors++;
109 }
110
111 stats->tx_packets++;
112 stats->tx_bytes += len;
113
114 return 1;
115}
116
117#else
118
119static int nr_rebuild_header(struct sk_buff *skb)
120{
121 return 1;
122}
123
124#endif
125
126static int nr_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
127 void *daddr, void *saddr, unsigned len)
128{
129 unsigned char *buff = skb_push(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
130
131 memcpy(buff, (saddr != NULL) ? saddr : dev->dev_addr, dev->addr_len);
132 buff[6] &= ~AX25_CBIT;
133 buff[6] &= ~AX25_EBIT;
134 buff[6] |= AX25_SSSID_SPARE;
135 buff += AX25_ADDR_LEN;
136
137 if (daddr != NULL)
138 memcpy(buff, daddr, dev->addr_len);
139 buff[6] &= ~AX25_CBIT;
140 buff[6] |= AX25_EBIT;
141 buff[6] |= AX25_SSSID_SPARE;
142 buff += AX25_ADDR_LEN;
143
144 *buff++ = sysctl_netrom_network_ttl_initialiser;
145
146 *buff++ = NR_PROTO_IP;
147 *buff++ = NR_PROTO_IP;
148 *buff++ = 0;
149 *buff++ = 0;
150 *buff++ = NR_PROTOEXT;
151
152 if (daddr != NULL)
153 return 37;
154
155 return -37;
156}
157
158static int nr_set_mac_address(struct net_device *dev, void *addr)
159{
160 struct sockaddr *sa = addr;
161
162 if (dev->flags & IFF_UP)
163 ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
164
165 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
166
167 if (dev->flags & IFF_UP)
168 ax25_listen_register((ax25_address *)dev->dev_addr, NULL);
169
170 return 0;
171}
172
173static int nr_open(struct net_device *dev)
174{
175 netif_start_queue(dev);
176 ax25_listen_register((ax25_address *)dev->dev_addr, NULL);
177 return 0;
178}
179
180static int nr_close(struct net_device *dev)
181{
182 ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
183 netif_stop_queue(dev);
184 return 0;
185}
186
187static int nr_xmit(struct sk_buff *skb, struct net_device *dev)
188{
189 struct net_device_stats *stats = netdev_priv(dev);
190 dev_kfree_skb(skb);
191 stats->tx_errors++;
192 return 0;
193}
194
195static struct net_device_stats *nr_get_stats(struct net_device *dev)
196{
197 return netdev_priv(dev);
198}
199
200void nr_setup(struct net_device *dev)
201{
202 SET_MODULE_OWNER(dev);
203 dev->mtu = NR_MAX_PACKET_SIZE;
204 dev->hard_start_xmit = nr_xmit;
205 dev->open = nr_open;
206 dev->stop = nr_close;
207
208 dev->hard_header = nr_header;
209 dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN;
210 dev->addr_len = AX25_ADDR_LEN;
211 dev->type = ARPHRD_NETROM;
212 dev->tx_queue_len = 40;
213 dev->rebuild_header = nr_rebuild_header;
214 dev->set_mac_address = nr_set_mac_address;
215
216 /* New-style flags. */
217 dev->flags = 0;
218
219 dev->get_stats = nr_get_stats;
220}