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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 (C) 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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090022#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#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
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -070038static int rose_header(struct sk_buff *skb, struct net_device *dev,
39 unsigned short type,
Eric Dumazet95c96172012-04-15 05:58:06 +000040 const void *daddr, const void *saddr, unsigned int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -070041{
42 unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2);
43
44 *buff++ = ROSE_GFI | ROSE_Q_BIT;
45 *buff++ = 0x00;
46 *buff++ = ROSE_DATA;
47 *buff++ = 0x7F;
48 *buff++ = AX25_P_IP;
49
50 if (daddr != NULL)
51 return 37;
52
53 return -37;
54}
55
56static int rose_rebuild_header(struct sk_buff *skb)
57{
Pavel Emelyanov78f150b2007-12-05 02:18:15 -080058#ifdef CONFIG_INET
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 struct net_device *dev = skb->dev;
Stephen Hemmingerd289d122009-01-09 13:01:05 +000060 struct net_device_stats *stats = &dev->stats;
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 unsigned char *bp = (unsigned char *)skb->data;
62 struct sk_buff *skbn;
Ralf Baechle8dc22d22006-07-03 19:29:15 -070063 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 if (arp_find(bp + 7, skb)) {
66 return 1;
67 }
68
69 if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {
70 kfree_skb(skb);
71 return 1;
72 }
73
74 if (skb->sk != NULL)
75 skb_set_owner_w(skbn, skb->sk);
76
77 kfree_skb(skb);
78
Ralf Baechle8dc22d22006-07-03 19:29:15 -070079 len = skbn->len;
80
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 if (!rose_route_frame(skbn, NULL)) {
82 kfree_skb(skbn);
83 stats->tx_errors++;
84 return 1;
85 }
86
87 stats->tx_packets++;
Ralf Baechle8dc22d22006-07-03 19:29:15 -070088 stats->tx_bytes += len;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089#endif
90 return 1;
91}
92
93static int rose_set_mac_address(struct net_device *dev, void *addr)
94{
95 struct sockaddr *sa = addr;
Ralf Baechlea159aaa2006-12-14 15:51:44 -080096 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
danborkmann@iogearbox.net81213b52012-03-27 22:47:43 +000098 if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len))
Ralf Baechlea159aaa2006-12-14 15:51:44 -080099 return 0;
100
101 if (dev->flags & IFF_UP) {
danborkmann@iogearbox.net81213b52012-03-27 22:47:43 +0000102 err = rose_add_loopback_node((rose_address *)sa->sa_data);
Ralf Baechlea159aaa2006-12-14 15:51:44 -0800103 if (err)
104 return err;
105
106 rose_del_loopback_node((rose_address *)dev->dev_addr);
107 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
109 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
110
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 return 0;
112}
113
114static int rose_open(struct net_device *dev)
115{
Ralf Baechlea159aaa2006-12-14 15:51:44 -0800116 int err;
117
118 err = rose_add_loopback_node((rose_address *)dev->dev_addr);
119 if (err)
120 return err;
121
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 netif_start_queue(dev);
Ralf Baechlea159aaa2006-12-14 15:51:44 -0800123
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 return 0;
125}
126
127static int rose_close(struct net_device *dev)
128{
129 netif_stop_queue(dev);
130 rose_del_loopback_node((rose_address *)dev->dev_addr);
131 return 0;
132}
133
Stephen Hemminger36e4d642009-08-31 19:50:43 +0000134static netdev_tx_t rose_xmit(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135{
Stephen Hemmingerd289d122009-01-09 13:01:05 +0000136 struct net_device_stats *stats = &dev->stats;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
138 if (!netif_running(dev)) {
139 printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n");
Patrick McHardy5b548142009-06-12 06:22:29 +0000140 return NETDEV_TX_BUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 }
142 dev_kfree_skb(skb);
143 stats->tx_errors++;
Patrick McHardy6ed10652009-06-23 06:03:08 +0000144 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145}
146
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700147static const struct header_ops rose_header_ops = {
148 .create = rose_header,
Weilong Chendb34de92013-12-19 11:55:17 +0800149 .rebuild = rose_rebuild_header,
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700150};
151
Stephen Hemminger3170c652009-01-09 13:01:06 +0000152static const struct net_device_ops rose_netdev_ops = {
153 .ndo_open = rose_open,
154 .ndo_stop = rose_close,
155 .ndo_start_xmit = rose_xmit,
156 .ndo_set_mac_address = rose_set_mac_address,
157};
158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159void rose_setup(struct net_device *dev)
160{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 dev->mtu = ROSE_MAX_PACKET_SIZE - 2;
Stephen Hemminger3170c652009-01-09 13:01:06 +0000162 dev->netdev_ops = &rose_netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700164 dev->header_ops = &rose_header_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 dev->hard_header_len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN;
166 dev->addr_len = ROSE_ADDR_LEN;
167 dev->type = ARPHRD_ROSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
169 /* New-style flags. */
Ralf Baechled2ce4bc2005-09-12 14:26:52 -0700170 dev->flags = IFF_NOARP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171}