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1da177e4 LT |
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 | */ | |
1da177e4 LT |
9 | #include <linux/module.h> |
10 | #include <linux/proc_fs.h> | |
11 | #include <linux/kernel.h> | |
1da177e4 LT |
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 | ||
23 | #include <asm/system.h> | |
24 | #include <asm/io.h> | |
25 | ||
26 | #include <linux/inet.h> | |
27 | #include <linux/netdevice.h> | |
28 | #include <linux/etherdevice.h> | |
29 | #include <linux/if_arp.h> | |
30 | #include <linux/skbuff.h> | |
31 | ||
32 | #include <net/ip.h> | |
33 | #include <net/arp.h> | |
34 | ||
35 | #include <net/ax25.h> | |
36 | #include <net/rose.h> | |
37 | ||
38 | static int rose_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, | |
39 | void *daddr, void *saddr, unsigned len) | |
40 | { | |
41 | unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2); | |
42 | ||
43 | *buff++ = ROSE_GFI | ROSE_Q_BIT; | |
44 | *buff++ = 0x00; | |
45 | *buff++ = ROSE_DATA; | |
46 | *buff++ = 0x7F; | |
47 | *buff++ = AX25_P_IP; | |
48 | ||
49 | if (daddr != NULL) | |
50 | return 37; | |
51 | ||
52 | return -37; | |
53 | } | |
54 | ||
55 | static int rose_rebuild_header(struct sk_buff *skb) | |
56 | { | |
57 | struct net_device *dev = skb->dev; | |
58 | struct net_device_stats *stats = netdev_priv(dev); | |
59 | unsigned char *bp = (unsigned char *)skb->data; | |
60 | struct sk_buff *skbn; | |
8dc22d2b | 61 | unsigned int len; |
1da177e4 LT |
62 | |
63 | #ifdef CONFIG_INET | |
64 | if (arp_find(bp + 7, skb)) { | |
65 | return 1; | |
66 | } | |
67 | ||
68 | if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) { | |
69 | kfree_skb(skb); | |
70 | return 1; | |
71 | } | |
72 | ||
73 | if (skb->sk != NULL) | |
74 | skb_set_owner_w(skbn, skb->sk); | |
75 | ||
76 | kfree_skb(skb); | |
77 | ||
8dc22d2b RB |
78 | len = skbn->len; |
79 | ||
1da177e4 LT |
80 | if (!rose_route_frame(skbn, NULL)) { |
81 | kfree_skb(skbn); | |
82 | stats->tx_errors++; | |
83 | return 1; | |
84 | } | |
85 | ||
86 | stats->tx_packets++; | |
8dc22d2b | 87 | stats->tx_bytes += len; |
1da177e4 LT |
88 | #endif |
89 | return 1; | |
90 | } | |
91 | ||
92 | static int rose_set_mac_address(struct net_device *dev, void *addr) | |
93 | { | |
94 | struct sockaddr *sa = addr; | |
a159aaa3 | 95 | int err; |
1da177e4 | 96 | |
a159aaa3 RB |
97 | if (!memcpy(dev->dev_addr, sa->sa_data, dev->addr_len)) |
98 | return 0; | |
1da177e4 | 99 | |
a159aaa3 RB |
100 | if (dev->flags & IFF_UP) { |
101 | err = rose_add_loopback_node((rose_address *)dev->dev_addr); | |
102 | if (err) | |
103 | return err; | |
104 | ||
105 | rose_del_loopback_node((rose_address *)dev->dev_addr); | |
106 | } | |
1da177e4 | 107 | |
a159aaa3 | 108 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); |
1da177e4 LT |
109 | |
110 | return 0; | |
111 | } | |
112 | ||
113 | static int rose_open(struct net_device *dev) | |
114 | { | |
a159aaa3 RB |
115 | int err; |
116 | ||
117 | err = rose_add_loopback_node((rose_address *)dev->dev_addr); | |
118 | if (err) | |
119 | return err; | |
120 | ||
1da177e4 | 121 | netif_start_queue(dev); |
a159aaa3 | 122 | |
1da177e4 LT |
123 | return 0; |
124 | } | |
125 | ||
126 | static int rose_close(struct net_device *dev) | |
127 | { | |
128 | netif_stop_queue(dev); | |
129 | rose_del_loopback_node((rose_address *)dev->dev_addr); | |
130 | return 0; | |
131 | } | |
132 | ||
133 | static int rose_xmit(struct sk_buff *skb, struct net_device *dev) | |
134 | { | |
135 | struct net_device_stats *stats = netdev_priv(dev); | |
136 | ||
137 | if (!netif_running(dev)) { | |
138 | printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n"); | |
139 | return 1; | |
140 | } | |
141 | dev_kfree_skb(skb); | |
142 | stats->tx_errors++; | |
143 | return 0; | |
144 | } | |
145 | ||
146 | static struct net_device_stats *rose_get_stats(struct net_device *dev) | |
147 | { | |
148 | return netdev_priv(dev); | |
149 | } | |
150 | ||
151 | void rose_setup(struct net_device *dev) | |
152 | { | |
1da177e4 LT |
153 | dev->mtu = ROSE_MAX_PACKET_SIZE - 2; |
154 | dev->hard_start_xmit = rose_xmit; | |
155 | dev->open = rose_open; | |
156 | dev->stop = rose_close; | |
157 | ||
158 | dev->hard_header = rose_header; | |
159 | dev->hard_header_len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN; | |
160 | dev->addr_len = ROSE_ADDR_LEN; | |
161 | dev->type = ARPHRD_ROSE; | |
162 | dev->rebuild_header = rose_rebuild_header; | |
163 | dev->set_mac_address = rose_set_mac_address; | |
164 | ||
165 | /* New-style flags. */ | |
d2ce4bc3 | 166 | dev->flags = IFF_NOARP; |
1da177e4 LT |
167 | dev->get_stats = rose_get_stats; |
168 | } |