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1da177e4 LT |
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 | */ | |
1da177e4 LT |
9 | #include <linux/module.h> |
10 | #include <linux/proc_fs.h> | |
11 | #include <linux/kernel.h> | |
1da177e4 LT |
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. */ | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
1da177e4 LT |
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 | ||
1da177e4 LT |
40 | /* |
41 | * Only allow IP over NET/ROM frames through if the netrom device is up. | |
42 | */ | |
43 | ||
44 | int nr_rx_ip(struct sk_buff *skb, struct net_device *dev) | |
45 | { | |
b51414b6 | 46 | struct net_device_stats *stats = &dev->stats; |
1da177e4 LT |
47 | |
48 | if (!netif_running(dev)) { | |
6ddcf626 | 49 | stats->rx_dropped++; |
1da177e4 LT |
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; | |
c6e6ca71 | 60 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 61 | skb_reset_network_header(skb); |
1da177e4 LT |
62 | skb->pkt_type = PACKET_HOST; |
63 | ||
98a82feb | 64 | netif_rx(skb); |
1da177e4 LT |
65 | |
66 | return 1; | |
67 | } | |
68 | ||
98a82feb | 69 | #ifdef CONFIG_INET |
1da177e4 LT |
70 | |
71 | static int nr_rebuild_header(struct sk_buff *skb) | |
72 | { | |
1da177e4 | 73 | unsigned char *bp = skb->data; |
1da177e4 | 74 | |
3f2aadd0 | 75 | if (arp_find(bp + 7, skb)) |
1da177e4 | 76 | return 1; |
1da177e4 LT |
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 | ||
3f2aadd0 | 87 | return 0; |
1da177e4 LT |
88 | } |
89 | ||
90 | #else | |
91 | ||
92 | static int nr_rebuild_header(struct sk_buff *skb) | |
93 | { | |
94 | return 1; | |
95 | } | |
96 | ||
97 | #endif | |
98 | ||
3b04ddde SH |
99 | static int nr_header(struct sk_buff *skb, struct net_device *dev, |
100 | unsigned short type, | |
101 | const void *daddr, const void *saddr, unsigned len) | |
1da177e4 LT |
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 | ||
81dcd169 | 132 | static int __must_check nr_set_mac_address(struct net_device *dev, void *addr) |
1da177e4 LT |
133 | { |
134 | struct sockaddr *sa = addr; | |
81dcd169 RB |
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; | |
1da177e4 | 144 | |
1da177e4 | 145 | ax25_listen_release((ax25_address *)dev->dev_addr, NULL); |
81dcd169 | 146 | } |
1da177e4 LT |
147 | |
148 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); | |
149 | ||
1da177e4 LT |
150 | return 0; |
151 | } | |
152 | ||
153 | static int nr_open(struct net_device *dev) | |
154 | { | |
81dcd169 RB |
155 | int err; |
156 | ||
157 | err = ax25_listen_register((ax25_address *)dev->dev_addr, NULL); | |
158 | if (err) | |
159 | return err; | |
160 | ||
1da177e4 | 161 | netif_start_queue(dev); |
81dcd169 | 162 | |
1da177e4 LT |
163 | return 0; |
164 | } | |
165 | ||
166 | static 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 | ||
36e4d64a | 173 | static netdev_tx_t nr_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 174 | { |
b51414b6 | 175 | struct net_device_stats *stats = &dev->stats; |
b88a762b | 176 | unsigned int len = skb->len; |
3f2aadd0 RB |
177 | |
178 | if (!nr_route_frame(skb, NULL)) { | |
179 | kfree_skb(skb); | |
180 | stats->tx_errors++; | |
6ed10654 | 181 | return NETDEV_TX_OK; |
3f2aadd0 RB |
182 | } |
183 | ||
184 | stats->tx_packets++; | |
185 | stats->tx_bytes += len; | |
186 | ||
6ed10654 | 187 | return NETDEV_TX_OK; |
1da177e4 LT |
188 | } |
189 | ||
3b04ddde SH |
190 | static const struct header_ops nr_header_ops = { |
191 | .create = nr_header, | |
192 | .rebuild= nr_rebuild_header, | |
193 | }; | |
194 | ||
0f6c5c8e SH |
195 | static 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 | }; | |
3b04ddde | 201 | |
1da177e4 LT |
202 | void nr_setup(struct net_device *dev) |
203 | { | |
1da177e4 | 204 | dev->mtu = NR_MAX_PACKET_SIZE; |
0f6c5c8e | 205 | dev->netdev_ops = &nr_netdev_ops; |
3b04ddde | 206 | dev->header_ops = &nr_header_ops; |
1da177e4 LT |
207 | dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN; |
208 | dev->addr_len = AX25_ADDR_LEN; | |
209 | dev->type = ARPHRD_NETROM; | |
1da177e4 LT |
210 | |
211 | /* New-style flags. */ | |
72377291 | 212 | dev->flags = IFF_NOARP; |
1da177e4 | 213 | } |