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/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>
22 #include <linux/slab.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
rose_header(struct sk_buff * skb,struct net_device * dev,unsigned short type,const void * daddr,const void * saddr,unsigned len)39 static int rose_header(struct sk_buff *skb, struct net_device *dev,
40 unsigned short type,
41 const void *daddr, const 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
rose_rebuild_header(struct sk_buff * skb)57 static int rose_rebuild_header(struct sk_buff *skb)
58 {
59 #ifdef CONFIG_INET
60 struct net_device *dev = skb->dev;
61 struct net_device_stats *stats = &dev->stats;
62 unsigned char *bp = (unsigned char *)skb->data;
63 struct sk_buff *skbn;
64 unsigned int len;
65
66 if (arp_find(bp + 7, skb)) {
67 return 1;
68 }
69
70 if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {
71 kfree_skb(skb);
72 return 1;
73 }
74
75 if (skb->sk != NULL)
76 skb_set_owner_w(skbn, skb->sk);
77
78 kfree_skb(skb);
79
80 len = skbn->len;
81
82 if (!rose_route_frame(skbn, NULL)) {
83 kfree_skb(skbn);
84 stats->tx_errors++;
85 return 1;
86 }
87
88 stats->tx_packets++;
89 stats->tx_bytes += len;
90 #endif
91 return 1;
92 }
93
rose_set_mac_address(struct net_device * dev,void * addr)94 static int rose_set_mac_address(struct net_device *dev, void *addr)
95 {
96 struct sockaddr *sa = addr;
97 int err;
98
99 if (!memcpy(dev->dev_addr, sa->sa_data, dev->addr_len))
100 return 0;
101
102 if (dev->flags & IFF_UP) {
103 err = rose_add_loopback_node((rose_address *)dev->dev_addr);
104 if (err)
105 return err;
106
107 rose_del_loopback_node((rose_address *)dev->dev_addr);
108 }
109
110 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
111
112 return 0;
113 }
114
rose_open(struct net_device * dev)115 static int rose_open(struct net_device *dev)
116 {
117 int err;
118
119 err = rose_add_loopback_node((rose_address *)dev->dev_addr);
120 if (err)
121 return err;
122
123 netif_start_queue(dev);
124
125 return 0;
126 }
127
rose_close(struct net_device * dev)128 static int rose_close(struct net_device *dev)
129 {
130 netif_stop_queue(dev);
131 rose_del_loopback_node((rose_address *)dev->dev_addr);
132 return 0;
133 }
134
rose_xmit(struct sk_buff * skb,struct net_device * dev)135 static netdev_tx_t rose_xmit(struct sk_buff *skb, struct net_device *dev)
136 {
137 struct net_device_stats *stats = &dev->stats;
138
139 if (!netif_running(dev)) {
140 printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n");
141 return NETDEV_TX_BUSY;
142 }
143 dev_kfree_skb(skb);
144 stats->tx_errors++;
145 return NETDEV_TX_OK;
146 }
147
148 static const struct header_ops rose_header_ops = {
149 .create = rose_header,
150 .rebuild= rose_rebuild_header,
151 };
152
153 static const struct net_device_ops rose_netdev_ops = {
154 .ndo_open = rose_open,
155 .ndo_stop = rose_close,
156 .ndo_start_xmit = rose_xmit,
157 .ndo_set_mac_address = rose_set_mac_address,
158 };
159
rose_setup(struct net_device * dev)160 void rose_setup(struct net_device *dev)
161 {
162 dev->mtu = ROSE_MAX_PACKET_SIZE - 2;
163 dev->netdev_ops = &rose_netdev_ops;
164
165 dev->header_ops = &rose_header_ops;
166 dev->hard_header_len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN;
167 dev->addr_len = ROSE_ADDR_LEN;
168 dev->type = ARPHRD_ROSE;
169
170 /* New-style flags. */
171 dev->flags = IFF_NOARP;
172 }
173