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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *
4 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
5 */
6#include <linux/module.h>
7#include <linux/proc_fs.h>
8#include <linux/kernel.h>
9#include <linux/interrupt.h>
10#include <linux/fs.h>
11#include <linux/types.h>
12#include <linux/sysctl.h>
13#include <linux/string.h>
14#include <linux/socket.h>
15#include <linux/errno.h>
16#include <linux/fcntl.h>
17#include <linux/in.h>
18#include <linux/if_ether.h>
19#include <linux/slab.h>
20
21#include <asm/io.h>
22
23#include <linux/inet.h>
24#include <linux/netdevice.h>
25#include <linux/etherdevice.h>
26#include <linux/if_arp.h>
27#include <linux/skbuff.h>
28
29#include <net/ip.h>
30#include <net/arp.h>
31
32#include <net/ax25.h>
33#include <net/rose.h>
34
35static int rose_header(struct sk_buff *skb, struct net_device *dev,
36 unsigned short type,
37 const void *daddr, const void *saddr, unsigned int len)
38{
39 unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2);
40
41 if (daddr)
42 memcpy(buff + 7, daddr, dev->addr_len);
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_set_mac_address(struct net_device *dev, void *addr)
57{
58 struct sockaddr *sa = addr;
59 int err;
60
61 if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len))
62 return 0;
63
64 if (dev->flags & IFF_UP) {
65 err = rose_add_loopback_node((rose_address *)sa->sa_data);
66 if (err)
67 return err;
68
69 rose_del_loopback_node((rose_address *)dev->dev_addr);
70 }
71
72 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
73
74 return 0;
75}
76
77static int rose_open(struct net_device *dev)
78{
79 int err;
80
81 err = rose_add_loopback_node((rose_address *)dev->dev_addr);
82 if (err)
83 return err;
84
85 netif_start_queue(dev);
86
87 return 0;
88}
89
90static int rose_close(struct net_device *dev)
91{
92 netif_stop_queue(dev);
93 rose_del_loopback_node((rose_address *)dev->dev_addr);
94 return 0;
95}
96
97static netdev_tx_t rose_xmit(struct sk_buff *skb, struct net_device *dev)
98{
99 struct net_device_stats *stats = &dev->stats;
100 unsigned int len = skb->len;
101
102 if (!netif_running(dev)) {
103 printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n");
104 return NETDEV_TX_BUSY;
105 }
106
107 if (!rose_route_frame(skb, NULL)) {
108 dev_kfree_skb(skb);
109 stats->tx_errors++;
110 return NETDEV_TX_OK;
111 }
112
113 stats->tx_packets++;
114 stats->tx_bytes += len;
115 return NETDEV_TX_OK;
116}
117
118static const struct header_ops rose_header_ops = {
119 .create = rose_header,
120};
121
122static const struct net_device_ops rose_netdev_ops = {
123 .ndo_open = rose_open,
124 .ndo_stop = rose_close,
125 .ndo_start_xmit = rose_xmit,
126 .ndo_set_mac_address = rose_set_mac_address,
127};
128
129void rose_setup(struct net_device *dev)
130{
131 dev->mtu = ROSE_MAX_PACKET_SIZE - 2;
132 dev->netdev_ops = &rose_netdev_ops;
133
134 dev->header_ops = &rose_header_ops;
135 dev->hard_header_len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN;
136 dev->addr_len = ROSE_ADDR_LEN;
137 dev->type = ARPHRD_ROSE;
138
139 /* New-style flags. */
140 dev->flags = IFF_NOARP;
141}
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
39static 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
57static 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
94static 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
115static 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
128static 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
135static 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
148static const struct header_ops rose_header_ops = {
149 .create = rose_header,
150 .rebuild= rose_rebuild_header,
151};
152
153static 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
160void 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}