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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. */ | |
22 | ||
23 | #include <asm/system.h> | |
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 | ||
1da177e4 LT |
39 | /* |
40 | * Only allow IP over NET/ROM frames through if the netrom device is up. | |
41 | */ | |
42 | ||
43 | int nr_rx_ip(struct sk_buff *skb, struct net_device *dev) | |
44 | { | |
45 | struct net_device_stats *stats = netdev_priv(dev); | |
46 | ||
47 | if (!netif_running(dev)) { | |
6ddcf626 | 48 | stats->rx_dropped++; |
1da177e4 LT |
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; | |
c6e6ca71 | 59 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 60 | skb_reset_network_header(skb); |
1da177e4 LT |
61 | skb->pkt_type = PACKET_HOST; |
62 | ||
98a82feb | 63 | netif_rx(skb); |
1da177e4 LT |
64 | |
65 | return 1; | |
66 | } | |
67 | ||
98a82feb | 68 | #ifdef CONFIG_INET |
1da177e4 LT |
69 | |
70 | static int nr_rebuild_header(struct sk_buff *skb) | |
71 | { | |
1da177e4 | 72 | unsigned char *bp = skb->data; |
1da177e4 | 73 | |
3f2aadd0 | 74 | if (arp_find(bp + 7, skb)) |
1da177e4 | 75 | return 1; |
1da177e4 LT |
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 | ||
3f2aadd0 | 86 | return 0; |
1da177e4 LT |
87 | } |
88 | ||
89 | #else | |
90 | ||
91 | static int nr_rebuild_header(struct sk_buff *skb) | |
92 | { | |
93 | return 1; | |
94 | } | |
95 | ||
96 | #endif | |
97 | ||
3b04ddde SH |
98 | static int nr_header(struct sk_buff *skb, struct net_device *dev, |
99 | unsigned short type, | |
100 | const void *daddr, const void *saddr, unsigned len) | |
1da177e4 LT |
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 | ||
81dcd169 | 131 | static int __must_check nr_set_mac_address(struct net_device *dev, void *addr) |
1da177e4 LT |
132 | { |
133 | struct sockaddr *sa = addr; | |
81dcd169 RB |
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; | |
1da177e4 | 143 | |
1da177e4 | 144 | ax25_listen_release((ax25_address *)dev->dev_addr, NULL); |
81dcd169 | 145 | } |
1da177e4 LT |
146 | |
147 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); | |
148 | ||
1da177e4 LT |
149 | return 0; |
150 | } | |
151 | ||
152 | static int nr_open(struct net_device *dev) | |
153 | { | |
81dcd169 RB |
154 | int err; |
155 | ||
156 | err = ax25_listen_register((ax25_address *)dev->dev_addr, NULL); | |
157 | if (err) | |
158 | return err; | |
159 | ||
1da177e4 | 160 | netif_start_queue(dev); |
81dcd169 | 161 | |
1da177e4 LT |
162 | return 0; |
163 | } | |
164 | ||
165 | static 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 | ||
172 | static int nr_xmit(struct sk_buff *skb, struct net_device *dev) | |
173 | { | |
b88a762b RB |
174 | struct nr_private *nr = netdev_priv(dev); |
175 | struct net_device_stats *stats = &nr->stats; | |
176 | unsigned int len = skb->len; | |
3f2aadd0 RB |
177 | |
178 | if (!nr_route_frame(skb, NULL)) { | |
179 | kfree_skb(skb); | |
180 | stats->tx_errors++; | |
181 | return 0; | |
182 | } | |
183 | ||
184 | stats->tx_packets++; | |
185 | stats->tx_bytes += len; | |
186 | ||
1da177e4 LT |
187 | return 0; |
188 | } | |
189 | ||
190 | static struct net_device_stats *nr_get_stats(struct net_device *dev) | |
191 | { | |
b88a762b RB |
192 | struct nr_private *nr = netdev_priv(dev); |
193 | ||
194 | return &nr->stats; | |
1da177e4 LT |
195 | } |
196 | ||
3b04ddde SH |
197 | static const struct header_ops nr_header_ops = { |
198 | .create = nr_header, | |
199 | .rebuild= nr_rebuild_header, | |
200 | }; | |
201 | ||
202 | ||
1da177e4 LT |
203 | void nr_setup(struct net_device *dev) |
204 | { | |
1da177e4 LT |
205 | dev->mtu = NR_MAX_PACKET_SIZE; |
206 | dev->hard_start_xmit = nr_xmit; | |
207 | dev->open = nr_open; | |
208 | dev->stop = nr_close; | |
209 | ||
3b04ddde | 210 | dev->header_ops = &nr_header_ops; |
1da177e4 LT |
211 | dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN; |
212 | dev->addr_len = AX25_ADDR_LEN; | |
213 | dev->type = ARPHRD_NETROM; | |
1da177e4 LT |
214 | dev->set_mac_address = nr_set_mac_address; |
215 | ||
216 | /* New-style flags. */ | |
72377291 | 217 | dev->flags = IFF_NOARP; |
1da177e4 LT |
218 | |
219 | dev->get_stats = nr_get_stats; | |
220 | } |