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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/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, | |
39 | unsigned short type, | |
40 | const void *daddr, const void *saddr, unsigned int len) | |
41 | { | |
42 | unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2); | |
43 | ||
44 | if (daddr) | |
45 | memcpy(buff + 7, daddr, dev->addr_len); | |
46 | ||
47 | *buff++ = ROSE_GFI | ROSE_Q_BIT; | |
48 | *buff++ = 0x00; | |
49 | *buff++ = ROSE_DATA; | |
50 | *buff++ = 0x7F; | |
51 | *buff++ = AX25_P_IP; | |
52 | ||
53 | if (daddr != NULL) | |
54 | return 37; | |
55 | ||
56 | return -37; | |
57 | } | |
58 | ||
59 | static int rose_set_mac_address(struct net_device *dev, void *addr) | |
60 | { | |
61 | struct sockaddr *sa = addr; | |
62 | int err; | |
63 | ||
64 | if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len)) | |
65 | return 0; | |
66 | ||
67 | if (dev->flags & IFF_UP) { | |
68 | err = rose_add_loopback_node((rose_address *)sa->sa_data); | |
69 | if (err) | |
70 | return err; | |
71 | ||
72 | rose_del_loopback_node((rose_address *)dev->dev_addr); | |
73 | } | |
74 | ||
75 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); | |
76 | ||
77 | return 0; | |
78 | } | |
79 | ||
80 | static int rose_open(struct net_device *dev) | |
81 | { | |
82 | int err; | |
83 | ||
84 | err = rose_add_loopback_node((rose_address *)dev->dev_addr); | |
85 | if (err) | |
86 | return err; | |
87 | ||
88 | netif_start_queue(dev); | |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
93 | static int rose_close(struct net_device *dev) | |
94 | { | |
95 | netif_stop_queue(dev); | |
96 | rose_del_loopback_node((rose_address *)dev->dev_addr); | |
97 | return 0; | |
98 | } | |
99 | ||
100 | static netdev_tx_t rose_xmit(struct sk_buff *skb, struct net_device *dev) | |
101 | { | |
102 | struct net_device_stats *stats = &dev->stats; | |
103 | unsigned int len = skb->len; | |
104 | ||
105 | if (!netif_running(dev)) { | |
106 | printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n"); | |
107 | return NETDEV_TX_BUSY; | |
108 | } | |
109 | ||
110 | if (!rose_route_frame(skb, NULL)) { | |
111 | dev_kfree_skb(skb); | |
112 | stats->tx_errors++; | |
113 | return NETDEV_TX_OK; | |
114 | } | |
115 | ||
116 | stats->tx_packets++; | |
117 | stats->tx_bytes += len; | |
118 | return NETDEV_TX_OK; | |
119 | } | |
120 | ||
121 | static const struct header_ops rose_header_ops = { | |
122 | .create = rose_header, | |
123 | }; | |
124 | ||
125 | static const struct net_device_ops rose_netdev_ops = { | |
126 | .ndo_open = rose_open, | |
127 | .ndo_stop = rose_close, | |
128 | .ndo_start_xmit = rose_xmit, | |
129 | .ndo_set_mac_address = rose_set_mac_address, | |
130 | }; | |
131 | ||
132 | void rose_setup(struct net_device *dev) | |
133 | { | |
134 | dev->mtu = ROSE_MAX_PACKET_SIZE - 2; | |
135 | dev->netdev_ops = &rose_netdev_ops; | |
136 | ||
137 | dev->header_ops = &rose_header_ops; | |
138 | dev->hard_header_len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN; | |
139 | dev->addr_len = ROSE_ADDR_LEN; | |
140 | dev->type = ARPHRD_ROSE; | |
141 | ||
142 | /* New-style flags. */ | |
143 | dev->flags = IFF_NOARP; | |
144 | } |