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