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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *
4 * Copyright 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> /* For the statistics structure. */
19#include <linux/slab.h>
20#include <linux/uaccess.h>
21
22#include <asm/io.h>
23
24#include <linux/inet.h>
25#include <linux/netdevice.h>
26#include <linux/etherdevice.h>
27#include <linux/if_arp.h>
28#include <linux/skbuff.h>
29
30#include <net/ip.h>
31#include <net/arp.h>
32
33#include <net/ax25.h>
34#include <net/netrom.h>
35
36/*
37 * Only allow IP over NET/ROM frames through if the netrom device is up.
38 */
39
40int nr_rx_ip(struct sk_buff *skb, struct net_device *dev)
41{
42 struct net_device_stats *stats = &dev->stats;
43
44 if (!netif_running(dev)) {
45 stats->rx_dropped++;
46 return 0;
47 }
48
49 stats->rx_packets++;
50 stats->rx_bytes += skb->len;
51
52 skb->protocol = htons(ETH_P_IP);
53
54 /* Spoof incoming device */
55 skb->dev = dev;
56 skb->mac_header = skb->network_header;
57 skb_reset_network_header(skb);
58 skb->pkt_type = PACKET_HOST;
59
60 netif_rx(skb);
61
62 return 1;
63}
64
65static int nr_header(struct sk_buff *skb, struct net_device *dev,
66 unsigned short type,
67 const void *daddr, const void *saddr, unsigned int len)
68{
69 unsigned char *buff = skb_push(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
70
71 memcpy(buff, (saddr != NULL) ? saddr : dev->dev_addr, dev->addr_len);
72 buff[6] &= ~AX25_CBIT;
73 buff[6] &= ~AX25_EBIT;
74 buff[6] |= AX25_SSSID_SPARE;
75 buff += AX25_ADDR_LEN;
76
77 if (daddr != NULL)
78 memcpy(buff, daddr, dev->addr_len);
79 buff[6] &= ~AX25_CBIT;
80 buff[6] |= AX25_EBIT;
81 buff[6] |= AX25_SSSID_SPARE;
82 buff += AX25_ADDR_LEN;
83
84 *buff++ = READ_ONCE(sysctl_netrom_network_ttl_initialiser);
85
86 *buff++ = NR_PROTO_IP;
87 *buff++ = NR_PROTO_IP;
88 *buff++ = 0;
89 *buff++ = 0;
90 *buff++ = NR_PROTOEXT;
91
92 if (daddr != NULL)
93 return 37;
94
95 return -37;
96}
97
98static int __must_check nr_set_mac_address(struct net_device *dev, void *addr)
99{
100 struct sockaddr *sa = addr;
101 int err;
102
103 if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len))
104 return 0;
105
106 if (dev->flags & IFF_UP) {
107 err = ax25_listen_register((ax25_address *)sa->sa_data, NULL);
108 if (err)
109 return err;
110
111 ax25_listen_release((const ax25_address *)dev->dev_addr, NULL);
112 }
113
114 dev_addr_set(dev, sa->sa_data);
115
116 return 0;
117}
118
119static int nr_open(struct net_device *dev)
120{
121 int err;
122
123 err = ax25_listen_register((const ax25_address *)dev->dev_addr, NULL);
124 if (err)
125 return err;
126
127 netif_start_queue(dev);
128
129 return 0;
130}
131
132static int nr_close(struct net_device *dev)
133{
134 ax25_listen_release((const ax25_address *)dev->dev_addr, NULL);
135 netif_stop_queue(dev);
136 return 0;
137}
138
139static netdev_tx_t nr_xmit(struct sk_buff *skb, struct net_device *dev)
140{
141 struct net_device_stats *stats = &dev->stats;
142 unsigned int len = skb->len;
143
144 if (!nr_route_frame(skb, NULL)) {
145 kfree_skb(skb);
146 stats->tx_errors++;
147 return NETDEV_TX_OK;
148 }
149
150 stats->tx_packets++;
151 stats->tx_bytes += len;
152
153 return NETDEV_TX_OK;
154}
155
156static const struct header_ops nr_header_ops = {
157 .create = nr_header,
158};
159
160static const struct net_device_ops nr_netdev_ops = {
161 .ndo_open = nr_open,
162 .ndo_stop = nr_close,
163 .ndo_start_xmit = nr_xmit,
164 .ndo_set_mac_address = nr_set_mac_address,
165};
166
167void nr_setup(struct net_device *dev)
168{
169 dev->mtu = NR_MAX_PACKET_SIZE;
170 dev->netdev_ops = &nr_netdev_ops;
171 dev->header_ops = &nr_header_ops;
172 dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN;
173 dev->addr_len = AX25_ADDR_LEN;
174 dev->type = ARPHRD_NETROM;
175
176 /* New-style flags. */
177 dev->flags = IFF_NOARP;
178}
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 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> /* For the statistics structure. */
22#include <linux/slab.h>
23
24#include <asm/system.h>
25#include <asm/uaccess.h>
26#include <asm/io.h>
27
28#include <linux/inet.h>
29#include <linux/netdevice.h>
30#include <linux/etherdevice.h>
31#include <linux/if_arp.h>
32#include <linux/skbuff.h>
33
34#include <net/ip.h>
35#include <net/arp.h>
36
37#include <net/ax25.h>
38#include <net/netrom.h>
39
40/*
41 * Only allow IP over NET/ROM frames through if the netrom device is up.
42 */
43
44int nr_rx_ip(struct sk_buff *skb, struct net_device *dev)
45{
46 struct net_device_stats *stats = &dev->stats;
47
48 if (!netif_running(dev)) {
49 stats->rx_dropped++;
50 return 0;
51 }
52
53 stats->rx_packets++;
54 stats->rx_bytes += skb->len;
55
56 skb->protocol = htons(ETH_P_IP);
57
58 /* Spoof incoming device */
59 skb->dev = dev;
60 skb->mac_header = skb->network_header;
61 skb_reset_network_header(skb);
62 skb->pkt_type = PACKET_HOST;
63
64 netif_rx(skb);
65
66 return 1;
67}
68
69#ifdef CONFIG_INET
70
71static int nr_rebuild_header(struct sk_buff *skb)
72{
73 unsigned char *bp = skb->data;
74
75 if (arp_find(bp + 7, skb))
76 return 1;
77
78 bp[6] &= ~AX25_CBIT;
79 bp[6] &= ~AX25_EBIT;
80 bp[6] |= AX25_SSSID_SPARE;
81 bp += AX25_ADDR_LEN;
82
83 bp[6] &= ~AX25_CBIT;
84 bp[6] |= AX25_EBIT;
85 bp[6] |= AX25_SSSID_SPARE;
86
87 return 0;
88}
89
90#else
91
92static int nr_rebuild_header(struct sk_buff *skb)
93{
94 return 1;
95}
96
97#endif
98
99static int nr_header(struct sk_buff *skb, struct net_device *dev,
100 unsigned short type,
101 const void *daddr, const void *saddr, unsigned len)
102{
103 unsigned char *buff = skb_push(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
104
105 memcpy(buff, (saddr != NULL) ? saddr : dev->dev_addr, dev->addr_len);
106 buff[6] &= ~AX25_CBIT;
107 buff[6] &= ~AX25_EBIT;
108 buff[6] |= AX25_SSSID_SPARE;
109 buff += AX25_ADDR_LEN;
110
111 if (daddr != NULL)
112 memcpy(buff, daddr, dev->addr_len);
113 buff[6] &= ~AX25_CBIT;
114 buff[6] |= AX25_EBIT;
115 buff[6] |= AX25_SSSID_SPARE;
116 buff += AX25_ADDR_LEN;
117
118 *buff++ = sysctl_netrom_network_ttl_initialiser;
119
120 *buff++ = NR_PROTO_IP;
121 *buff++ = NR_PROTO_IP;
122 *buff++ = 0;
123 *buff++ = 0;
124 *buff++ = NR_PROTOEXT;
125
126 if (daddr != NULL)
127 return 37;
128
129 return -37;
130}
131
132static int __must_check nr_set_mac_address(struct net_device *dev, void *addr)
133{
134 struct sockaddr *sa = addr;
135 int err;
136
137 if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len))
138 return 0;
139
140 if (dev->flags & IFF_UP) {
141 err = ax25_listen_register((ax25_address *)sa->sa_data, NULL);
142 if (err)
143 return err;
144
145 ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
146 }
147
148 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
149
150 return 0;
151}
152
153static int nr_open(struct net_device *dev)
154{
155 int err;
156
157 err = ax25_listen_register((ax25_address *)dev->dev_addr, NULL);
158 if (err)
159 return err;
160
161 netif_start_queue(dev);
162
163 return 0;
164}
165
166static int nr_close(struct net_device *dev)
167{
168 ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
169 netif_stop_queue(dev);
170 return 0;
171}
172
173static netdev_tx_t nr_xmit(struct sk_buff *skb, struct net_device *dev)
174{
175 struct net_device_stats *stats = &dev->stats;
176 unsigned int len = skb->len;
177
178 if (!nr_route_frame(skb, NULL)) {
179 kfree_skb(skb);
180 stats->tx_errors++;
181 return NETDEV_TX_OK;
182 }
183
184 stats->tx_packets++;
185 stats->tx_bytes += len;
186
187 return NETDEV_TX_OK;
188}
189
190static const struct header_ops nr_header_ops = {
191 .create = nr_header,
192 .rebuild= nr_rebuild_header,
193};
194
195static const struct net_device_ops nr_netdev_ops = {
196 .ndo_open = nr_open,
197 .ndo_stop = nr_close,
198 .ndo_start_xmit = nr_xmit,
199 .ndo_set_mac_address = nr_set_mac_address,
200};
201
202void nr_setup(struct net_device *dev)
203{
204 dev->mtu = NR_MAX_PACKET_SIZE;
205 dev->netdev_ops = &nr_netdev_ops;
206 dev->header_ops = &nr_header_ops;
207 dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN;
208 dev->addr_len = AX25_ADDR_LEN;
209 dev->type = ARPHRD_NETROM;
210
211 /* New-style flags. */
212 dev->flags = IFF_NOARP;
213}