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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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | } |