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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 | */ | |
9 | #include <linux/config.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/proc_fs.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/sched.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/fs.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/sysctl.h> | |
18 | #include <linux/string.h> | |
19 | #include <linux/socket.h> | |
20 | #include <linux/errno.h> | |
21 | #include <linux/fcntl.h> | |
22 | #include <linux/in.h> | |
23 | #include <linux/if_ether.h> /* For the statistics structure. */ | |
24 | ||
25 | #include <asm/system.h> | |
26 | #include <asm/uaccess.h> | |
27 | #include <asm/io.h> | |
28 | ||
29 | #include <linux/inet.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/etherdevice.h> | |
32 | #include <linux/if_arp.h> | |
33 | #include <linux/skbuff.h> | |
34 | ||
35 | #include <net/ip.h> | |
36 | #include <net/arp.h> | |
37 | ||
38 | #include <net/ax25.h> | |
39 | #include <net/netrom.h> | |
40 | ||
1da177e4 LT |
41 | /* |
42 | * Only allow IP over NET/ROM frames through if the netrom device is up. | |
43 | */ | |
44 | ||
45 | int nr_rx_ip(struct sk_buff *skb, struct net_device *dev) | |
46 | { | |
47 | struct net_device_stats *stats = netdev_priv(dev); | |
48 | ||
49 | if (!netif_running(dev)) { | |
6ddcf626 | 50 | stats->rx_dropped++; |
1da177e4 LT |
51 | return 0; |
52 | } | |
53 | ||
54 | stats->rx_packets++; | |
55 | stats->rx_bytes += skb->len; | |
56 | ||
57 | skb->protocol = htons(ETH_P_IP); | |
58 | ||
59 | /* Spoof incoming device */ | |
60 | skb->dev = dev; | |
61 | skb->h.raw = skb->data; | |
62 | skb->nh.raw = skb->data; | |
63 | skb->pkt_type = PACKET_HOST; | |
64 | ||
98a82feb | 65 | netif_rx(skb); |
1da177e4 LT |
66 | |
67 | return 1; | |
68 | } | |
69 | ||
98a82feb | 70 | #ifdef CONFIG_INET |
1da177e4 LT |
71 | |
72 | static int nr_rebuild_header(struct sk_buff *skb) | |
73 | { | |
1da177e4 | 74 | unsigned char *bp = skb->data; |
1da177e4 | 75 | |
3f2aadd0 | 76 | if (arp_find(bp + 7, skb)) |
1da177e4 | 77 | return 1; |
1da177e4 LT |
78 | |
79 | bp[6] &= ~AX25_CBIT; | |
80 | bp[6] &= ~AX25_EBIT; | |
81 | bp[6] |= AX25_SSSID_SPARE; | |
82 | bp += AX25_ADDR_LEN; | |
83 | ||
84 | bp[6] &= ~AX25_CBIT; | |
85 | bp[6] |= AX25_EBIT; | |
86 | bp[6] |= AX25_SSSID_SPARE; | |
87 | ||
3f2aadd0 | 88 | return 0; |
1da177e4 LT |
89 | } |
90 | ||
91 | #else | |
92 | ||
93 | static int nr_rebuild_header(struct sk_buff *skb) | |
94 | { | |
95 | return 1; | |
96 | } | |
97 | ||
98 | #endif | |
99 | ||
100 | static int nr_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, | |
101 | void *daddr, 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 | ||
132 | static int nr_set_mac_address(struct net_device *dev, void *addr) | |
133 | { | |
134 | struct sockaddr *sa = addr; | |
135 | ||
136 | if (dev->flags & IFF_UP) | |
137 | ax25_listen_release((ax25_address *)dev->dev_addr, NULL); | |
138 | ||
139 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); | |
140 | ||
141 | if (dev->flags & IFF_UP) | |
142 | ax25_listen_register((ax25_address *)dev->dev_addr, NULL); | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
147 | static int nr_open(struct net_device *dev) | |
148 | { | |
149 | netif_start_queue(dev); | |
150 | ax25_listen_register((ax25_address *)dev->dev_addr, NULL); | |
151 | return 0; | |
152 | } | |
153 | ||
154 | static int nr_close(struct net_device *dev) | |
155 | { | |
156 | ax25_listen_release((ax25_address *)dev->dev_addr, NULL); | |
157 | netif_stop_queue(dev); | |
158 | return 0; | |
159 | } | |
160 | ||
161 | static int nr_xmit(struct sk_buff *skb, struct net_device *dev) | |
162 | { | |
163 | struct net_device_stats *stats = netdev_priv(dev); | |
3f2aadd0 RB |
164 | unsigned int len; |
165 | ||
166 | len = skb->len; | |
167 | ||
168 | if (!nr_route_frame(skb, NULL)) { | |
169 | kfree_skb(skb); | |
170 | stats->tx_errors++; | |
171 | return 0; | |
172 | } | |
173 | ||
174 | stats->tx_packets++; | |
175 | stats->tx_bytes += len; | |
176 | ||
1da177e4 LT |
177 | return 0; |
178 | } | |
179 | ||
180 | static struct net_device_stats *nr_get_stats(struct net_device *dev) | |
181 | { | |
182 | return netdev_priv(dev); | |
183 | } | |
184 | ||
185 | void nr_setup(struct net_device *dev) | |
186 | { | |
187 | SET_MODULE_OWNER(dev); | |
188 | dev->mtu = NR_MAX_PACKET_SIZE; | |
189 | dev->hard_start_xmit = nr_xmit; | |
190 | dev->open = nr_open; | |
191 | dev->stop = nr_close; | |
192 | ||
193 | dev->hard_header = nr_header; | |
194 | dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN; | |
195 | dev->addr_len = AX25_ADDR_LEN; | |
196 | dev->type = ARPHRD_NETROM; | |
197 | dev->tx_queue_len = 40; | |
198 | dev->rebuild_header = nr_rebuild_header; | |
199 | dev->set_mac_address = nr_set_mac_address; | |
200 | ||
201 | /* New-style flags. */ | |
202 | dev->flags = 0; | |
203 | ||
204 | dev->get_stats = nr_get_stats; | |
205 | } |