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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/module.h>
10#include <linux/proc_fs.h>
11#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#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> /* For the statistics structure. */
22
23#include <asm/system.h>
24#include <asm/uaccess.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/netrom.h>
38
Linus Torvalds1da177e2005-04-16 15:20:36 -070039/*
40 * Only allow IP over NET/ROM frames through if the netrom device is up.
41 */
42
43int nr_rx_ip(struct sk_buff *skb, struct net_device *dev)
44{
45 struct net_device_stats *stats = netdev_priv(dev);
46
47 if (!netif_running(dev)) {
Ralf Baechle6ddcf622005-09-12 14:23:06 -070048 stats->rx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 return 0;
50 }
51
52 stats->rx_packets++;
53 stats->rx_bytes += skb->len;
54
55 skb->protocol = htons(ETH_P_IP);
56
57 /* Spoof incoming device */
58 skb->dev = dev;
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -070059 skb_reset_mac_header(skb);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -070060 skb_reset_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 skb->pkt_type = PACKET_HOST;
62
Ralf Baechle98a82fe2005-08-24 11:35:51 -070063 netif_rx(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
65 return 1;
66}
67
Ralf Baechle98a82fe2005-08-24 11:35:51 -070068#ifdef CONFIG_INET
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
70static int nr_rebuild_header(struct sk_buff *skb)
71{
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 unsigned char *bp = skb->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
Ralf Baechle3f2aadd2005-09-12 14:21:48 -070074 if (arp_find(bp + 7, skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
77 bp[6] &= ~AX25_CBIT;
78 bp[6] &= ~AX25_EBIT;
79 bp[6] |= AX25_SSSID_SPARE;
80 bp += AX25_ADDR_LEN;
81
82 bp[6] &= ~AX25_CBIT;
83 bp[6] |= AX25_EBIT;
84 bp[6] |= AX25_SSSID_SPARE;
85
Ralf Baechle3f2aadd2005-09-12 14:21:48 -070086 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087}
88
89#else
90
91static int nr_rebuild_header(struct sk_buff *skb)
92{
93 return 1;
94}
95
96#endif
97
98static int nr_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
99 void *daddr, void *saddr, unsigned len)
100{
101 unsigned char *buff = skb_push(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
102
103 memcpy(buff, (saddr != NULL) ? saddr : dev->dev_addr, dev->addr_len);
104 buff[6] &= ~AX25_CBIT;
105 buff[6] &= ~AX25_EBIT;
106 buff[6] |= AX25_SSSID_SPARE;
107 buff += AX25_ADDR_LEN;
108
109 if (daddr != NULL)
110 memcpy(buff, daddr, dev->addr_len);
111 buff[6] &= ~AX25_CBIT;
112 buff[6] |= AX25_EBIT;
113 buff[6] |= AX25_SSSID_SPARE;
114 buff += AX25_ADDR_LEN;
115
116 *buff++ = sysctl_netrom_network_ttl_initialiser;
117
118 *buff++ = NR_PROTO_IP;
119 *buff++ = NR_PROTO_IP;
120 *buff++ = 0;
121 *buff++ = 0;
122 *buff++ = NR_PROTOEXT;
123
124 if (daddr != NULL)
125 return 37;
126
127 return -37;
128}
129
Ralf Baechle81dcd162006-12-14 15:50:34 -0800130static int __must_check nr_set_mac_address(struct net_device *dev, void *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131{
132 struct sockaddr *sa = addr;
Ralf Baechle81dcd162006-12-14 15:50:34 -0800133 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
Ralf Baechle81dcd162006-12-14 15:50:34 -0800135 if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len))
136 return 0;
137
138 if (dev->flags & IFF_UP) {
139 err = ax25_listen_register((ax25_address *)sa->sa_data, NULL);
140 if (err)
141 return err;
142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
Ralf Baechle81dcd162006-12-14 15:50:34 -0800144 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
146 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
147
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 return 0;
149}
150
151static int nr_open(struct net_device *dev)
152{
Ralf Baechle81dcd162006-12-14 15:50:34 -0800153 int err;
154
155 err = ax25_listen_register((ax25_address *)dev->dev_addr, NULL);
156 if (err)
157 return err;
158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 netif_start_queue(dev);
Ralf Baechle81dcd162006-12-14 15:50:34 -0800160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 return 0;
162}
163
164static int nr_close(struct net_device *dev)
165{
166 ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
167 netif_stop_queue(dev);
168 return 0;
169}
170
171static int nr_xmit(struct sk_buff *skb, struct net_device *dev)
172{
Ralf Baechleb88a7622005-09-12 14:28:03 -0700173 struct nr_private *nr = netdev_priv(dev);
174 struct net_device_stats *stats = &nr->stats;
175 unsigned int len = skb->len;
Ralf Baechle3f2aadd2005-09-12 14:21:48 -0700176
177 if (!nr_route_frame(skb, NULL)) {
178 kfree_skb(skb);
179 stats->tx_errors++;
180 return 0;
181 }
182
183 stats->tx_packets++;
184 stats->tx_bytes += len;
185
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 return 0;
187}
188
189static struct net_device_stats *nr_get_stats(struct net_device *dev)
190{
Ralf Baechleb88a7622005-09-12 14:28:03 -0700191 struct nr_private *nr = netdev_priv(dev);
192
193 return &nr->stats;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194}
195
196void nr_setup(struct net_device *dev)
197{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 dev->mtu = NR_MAX_PACKET_SIZE;
199 dev->hard_start_xmit = nr_xmit;
200 dev->open = nr_open;
201 dev->stop = nr_close;
202
203 dev->hard_header = nr_header;
204 dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN;
205 dev->addr_len = AX25_ADDR_LEN;
206 dev->type = ARPHRD_NETROM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 dev->rebuild_header = nr_rebuild_header;
208 dev->set_mac_address = nr_set_mac_address;
209
210 /* New-style flags. */
Ralf Baechle72377292005-09-12 14:26:26 -0700211 dev->flags = IFF_NOARP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
213 dev->get_stats = nr_get_stats;
214}