1 // SPDX-License-Identifier: GPL-2.0-or-later <<
2 /* 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.
3 * 6 *
4 * Copyright Jonathan Naylor G4KLX (g4klx@g4kl 7 * Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
5 */ 8 */
6 #include <linux/module.h> 9 #include <linux/module.h>
7 #include <linux/proc_fs.h> 10 #include <linux/proc_fs.h>
8 #include <linux/kernel.h> 11 #include <linux/kernel.h>
9 #include <linux/interrupt.h> 12 #include <linux/interrupt.h>
10 #include <linux/fs.h> 13 #include <linux/fs.h>
11 #include <linux/types.h> 14 #include <linux/types.h>
12 #include <linux/sysctl.h> 15 #include <linux/sysctl.h>
13 #include <linux/string.h> 16 #include <linux/string.h>
14 #include <linux/socket.h> 17 #include <linux/socket.h>
15 #include <linux/errno.h> 18 #include <linux/errno.h>
16 #include <linux/fcntl.h> 19 #include <linux/fcntl.h>
17 #include <linux/in.h> 20 #include <linux/in.h>
18 #include <linux/if_ether.h> /* For the sta 21 #include <linux/if_ether.h> /* For the statistics structure. */
19 #include <linux/slab.h> 22 #include <linux/slab.h>
20 #include <linux/uaccess.h> 23 #include <linux/uaccess.h>
21 24
22 #include <asm/io.h> 25 #include <asm/io.h>
23 26
24 #include <linux/inet.h> 27 #include <linux/inet.h>
25 #include <linux/netdevice.h> 28 #include <linux/netdevice.h>
26 #include <linux/etherdevice.h> 29 #include <linux/etherdevice.h>
27 #include <linux/if_arp.h> 30 #include <linux/if_arp.h>
28 #include <linux/skbuff.h> 31 #include <linux/skbuff.h>
29 32
30 #include <net/ip.h> 33 #include <net/ip.h>
31 #include <net/arp.h> 34 #include <net/arp.h>
32 35
33 #include <net/ax25.h> 36 #include <net/ax25.h>
34 #include <net/netrom.h> 37 #include <net/netrom.h>
35 38
36 /* 39 /*
37 * Only allow IP over NET/ROM frames thro 40 * Only allow IP over NET/ROM frames through if the netrom device is up.
38 */ 41 */
39 42
40 int nr_rx_ip(struct sk_buff *skb, struct net_d 43 int nr_rx_ip(struct sk_buff *skb, struct net_device *dev)
41 { 44 {
42 struct net_device_stats *stats = &dev- 45 struct net_device_stats *stats = &dev->stats;
43 46
44 if (!netif_running(dev)) { 47 if (!netif_running(dev)) {
45 stats->rx_dropped++; 48 stats->rx_dropped++;
46 return 0; 49 return 0;
47 } 50 }
48 51
49 stats->rx_packets++; 52 stats->rx_packets++;
50 stats->rx_bytes += skb->len; 53 stats->rx_bytes += skb->len;
51 54
52 skb->protocol = htons(ETH_P_IP); 55 skb->protocol = htons(ETH_P_IP);
53 56
54 /* Spoof incoming device */ 57 /* Spoof incoming device */
55 skb->dev = dev; 58 skb->dev = dev;
56 skb->mac_header = skb->network_header; 59 skb->mac_header = skb->network_header;
57 skb_reset_network_header(skb); 60 skb_reset_network_header(skb);
58 skb->pkt_type = PACKET_HOST; 61 skb->pkt_type = PACKET_HOST;
59 62
60 netif_rx(skb); 63 netif_rx(skb);
61 64
62 return 1; 65 return 1;
63 } 66 }
64 67
65 static int nr_header(struct sk_buff *skb, stru 68 static int nr_header(struct sk_buff *skb, struct net_device *dev,
66 unsigned short type, 69 unsigned short type,
67 const void *daddr, const 70 const void *daddr, const void *saddr, unsigned int len)
68 { 71 {
69 unsigned char *buff = skb_push(skb, NR 72 unsigned char *buff = skb_push(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
70 73
71 memcpy(buff, (saddr != NULL) ? saddr : 74 memcpy(buff, (saddr != NULL) ? saddr : dev->dev_addr, dev->addr_len);
72 buff[6] &= ~AX25_CBIT; 75 buff[6] &= ~AX25_CBIT;
73 buff[6] &= ~AX25_EBIT; 76 buff[6] &= ~AX25_EBIT;
74 buff[6] |= AX25_SSSID_SPARE; 77 buff[6] |= AX25_SSSID_SPARE;
75 buff += AX25_ADDR_LEN; 78 buff += AX25_ADDR_LEN;
76 79
77 if (daddr != NULL) 80 if (daddr != NULL)
78 memcpy(buff, daddr, dev->addr_ 81 memcpy(buff, daddr, dev->addr_len);
79 buff[6] &= ~AX25_CBIT; 82 buff[6] &= ~AX25_CBIT;
80 buff[6] |= AX25_EBIT; 83 buff[6] |= AX25_EBIT;
81 buff[6] |= AX25_SSSID_SPARE; 84 buff[6] |= AX25_SSSID_SPARE;
82 buff += AX25_ADDR_LEN; 85 buff += AX25_ADDR_LEN;
83 86
84 *buff++ = READ_ONCE(sysctl_netrom_netw !! 87 *buff++ = sysctl_netrom_network_ttl_initialiser;
85 88
86 *buff++ = NR_PROTO_IP; 89 *buff++ = NR_PROTO_IP;
87 *buff++ = NR_PROTO_IP; 90 *buff++ = NR_PROTO_IP;
88 *buff++ = 0; 91 *buff++ = 0;
89 *buff++ = 0; 92 *buff++ = 0;
90 *buff++ = NR_PROTOEXT; 93 *buff++ = NR_PROTOEXT;
91 94
92 if (daddr != NULL) 95 if (daddr != NULL)
93 return 37; 96 return 37;
94 97
95 return -37; 98 return -37;
96 } 99 }
97 100
98 static int __must_check nr_set_mac_address(str 101 static int __must_check nr_set_mac_address(struct net_device *dev, void *addr)
99 { 102 {
100 struct sockaddr *sa = addr; 103 struct sockaddr *sa = addr;
101 int err; 104 int err;
102 105
103 if (!memcmp(dev->dev_addr, sa->sa_data 106 if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len))
104 return 0; 107 return 0;
105 108
106 if (dev->flags & IFF_UP) { 109 if (dev->flags & IFF_UP) {
107 err = ax25_listen_register((ax 110 err = ax25_listen_register((ax25_address *)sa->sa_data, NULL);
108 if (err) 111 if (err)
109 return err; 112 return err;
110 113
111 ax25_listen_release((const ax2 !! 114 ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
112 } 115 }
113 116
114 dev_addr_set(dev, sa->sa_data); !! 117 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
115 118
116 return 0; 119 return 0;
117 } 120 }
118 121
119 static int nr_open(struct net_device *dev) 122 static int nr_open(struct net_device *dev)
120 { 123 {
121 int err; 124 int err;
122 125
123 err = ax25_listen_register((const ax25 !! 126 err = ax25_listen_register((ax25_address *)dev->dev_addr, NULL);
124 if (err) 127 if (err)
125 return err; 128 return err;
126 129
127 netif_start_queue(dev); 130 netif_start_queue(dev);
128 131
129 return 0; 132 return 0;
130 } 133 }
131 134
132 static int nr_close(struct net_device *dev) 135 static int nr_close(struct net_device *dev)
133 { 136 {
134 ax25_listen_release((const ax25_addres !! 137 ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
135 netif_stop_queue(dev); 138 netif_stop_queue(dev);
136 return 0; 139 return 0;
137 } 140 }
138 141
139 static netdev_tx_t nr_xmit(struct sk_buff *skb 142 static netdev_tx_t nr_xmit(struct sk_buff *skb, struct net_device *dev)
140 { 143 {
141 struct net_device_stats *stats = &dev- 144 struct net_device_stats *stats = &dev->stats;
142 unsigned int len = skb->len; 145 unsigned int len = skb->len;
143 146
144 if (!nr_route_frame(skb, NULL)) { 147 if (!nr_route_frame(skb, NULL)) {
145 kfree_skb(skb); 148 kfree_skb(skb);
146 stats->tx_errors++; 149 stats->tx_errors++;
147 return NETDEV_TX_OK; 150 return NETDEV_TX_OK;
148 } 151 }
149 152
150 stats->tx_packets++; 153 stats->tx_packets++;
151 stats->tx_bytes += len; 154 stats->tx_bytes += len;
152 155
153 return NETDEV_TX_OK; 156 return NETDEV_TX_OK;
154 } 157 }
155 158
156 static const struct header_ops nr_header_ops = 159 static const struct header_ops nr_header_ops = {
157 .create = nr_header, 160 .create = nr_header,
158 }; 161 };
159 162
160 static const struct net_device_ops nr_netdev_o 163 static const struct net_device_ops nr_netdev_ops = {
161 .ndo_open = nr_open, 164 .ndo_open = nr_open,
162 .ndo_stop = nr_close, 165 .ndo_stop = nr_close,
163 .ndo_start_xmit = nr_xmit, 166 .ndo_start_xmit = nr_xmit,
164 .ndo_set_mac_address = nr_set_mac_a 167 .ndo_set_mac_address = nr_set_mac_address,
165 }; 168 };
166 169
167 void nr_setup(struct net_device *dev) 170 void nr_setup(struct net_device *dev)
168 { 171 {
169 dev->mtu = NR_MAX_PACKE 172 dev->mtu = NR_MAX_PACKET_SIZE;
170 dev->netdev_ops = &nr_netdev_o 173 dev->netdev_ops = &nr_netdev_ops;
171 dev->header_ops = &nr_header_o 174 dev->header_ops = &nr_header_ops;
172 dev->hard_header_len = NR_NETWORK_L 175 dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN;
173 dev->addr_len = AX25_ADDR_LE 176 dev->addr_len = AX25_ADDR_LEN;
174 dev->type = ARPHRD_NETRO 177 dev->type = ARPHRD_NETROM;
175 178
176 /* New-style flags. */ 179 /* New-style flags. */
177 dev->flags = IFF_NOARP; 180 dev->flags = IFF_NOARP;
178 } 181 }
179 182
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