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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 | ||
41 | #ifdef CONFIG_INET | |
42 | ||
43 | /* | |
44 | * Only allow IP over NET/ROM frames through if the netrom device is up. | |
45 | */ | |
46 | ||
47 | int nr_rx_ip(struct sk_buff *skb, struct net_device *dev) | |
48 | { | |
49 | struct net_device_stats *stats = netdev_priv(dev); | |
50 | ||
51 | if (!netif_running(dev)) { | |
52 | stats->rx_errors++; | |
53 | return 0; | |
54 | } | |
55 | ||
56 | stats->rx_packets++; | |
57 | stats->rx_bytes += skb->len; | |
58 | ||
59 | skb->protocol = htons(ETH_P_IP); | |
60 | ||
61 | /* Spoof incoming device */ | |
62 | skb->dev = dev; | |
63 | skb->h.raw = skb->data; | |
64 | skb->nh.raw = skb->data; | |
65 | skb->pkt_type = PACKET_HOST; | |
66 | ||
67 | ip_rcv(skb, skb->dev, NULL); | |
68 | ||
69 | return 1; | |
70 | } | |
71 | ||
72 | ||
73 | static int nr_rebuild_header(struct sk_buff *skb) | |
74 | { | |
75 | struct net_device *dev = skb->dev; | |
76 | struct net_device_stats *stats = netdev_priv(dev); | |
77 | struct sk_buff *skbn; | |
78 | unsigned char *bp = skb->data; | |
79 | int len; | |
80 | ||
81 | if (arp_find(bp + 7, skb)) { | |
82 | return 1; | |
83 | } | |
84 | ||
85 | bp[6] &= ~AX25_CBIT; | |
86 | bp[6] &= ~AX25_EBIT; | |
87 | bp[6] |= AX25_SSSID_SPARE; | |
88 | bp += AX25_ADDR_LEN; | |
89 | ||
90 | bp[6] &= ~AX25_CBIT; | |
91 | bp[6] |= AX25_EBIT; | |
92 | bp[6] |= AX25_SSSID_SPARE; | |
93 | ||
94 | if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) { | |
95 | kfree_skb(skb); | |
96 | return 1; | |
97 | } | |
98 | ||
99 | if (skb->sk != NULL) | |
100 | skb_set_owner_w(skbn, skb->sk); | |
101 | ||
102 | kfree_skb(skb); | |
103 | ||
104 | len = skbn->len; | |
105 | ||
106 | if (!nr_route_frame(skbn, NULL)) { | |
107 | kfree_skb(skbn); | |
108 | stats->tx_errors++; | |
109 | } | |
110 | ||
111 | stats->tx_packets++; | |
112 | stats->tx_bytes += len; | |
113 | ||
114 | return 1; | |
115 | } | |
116 | ||
117 | #else | |
118 | ||
119 | static int nr_rebuild_header(struct sk_buff *skb) | |
120 | { | |
121 | return 1; | |
122 | } | |
123 | ||
124 | #endif | |
125 | ||
126 | static int nr_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, | |
127 | void *daddr, void *saddr, unsigned len) | |
128 | { | |
129 | unsigned char *buff = skb_push(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN); | |
130 | ||
131 | memcpy(buff, (saddr != NULL) ? saddr : dev->dev_addr, dev->addr_len); | |
132 | buff[6] &= ~AX25_CBIT; | |
133 | buff[6] &= ~AX25_EBIT; | |
134 | buff[6] |= AX25_SSSID_SPARE; | |
135 | buff += AX25_ADDR_LEN; | |
136 | ||
137 | if (daddr != NULL) | |
138 | memcpy(buff, daddr, dev->addr_len); | |
139 | buff[6] &= ~AX25_CBIT; | |
140 | buff[6] |= AX25_EBIT; | |
141 | buff[6] |= AX25_SSSID_SPARE; | |
142 | buff += AX25_ADDR_LEN; | |
143 | ||
144 | *buff++ = sysctl_netrom_network_ttl_initialiser; | |
145 | ||
146 | *buff++ = NR_PROTO_IP; | |
147 | *buff++ = NR_PROTO_IP; | |
148 | *buff++ = 0; | |
149 | *buff++ = 0; | |
150 | *buff++ = NR_PROTOEXT; | |
151 | ||
152 | if (daddr != NULL) | |
153 | return 37; | |
154 | ||
155 | return -37; | |
156 | } | |
157 | ||
158 | static int nr_set_mac_address(struct net_device *dev, void *addr) | |
159 | { | |
160 | struct sockaddr *sa = addr; | |
161 | ||
162 | if (dev->flags & IFF_UP) | |
163 | ax25_listen_release((ax25_address *)dev->dev_addr, NULL); | |
164 | ||
165 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); | |
166 | ||
167 | if (dev->flags & IFF_UP) | |
168 | ax25_listen_register((ax25_address *)dev->dev_addr, NULL); | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
173 | static int nr_open(struct net_device *dev) | |
174 | { | |
175 | netif_start_queue(dev); | |
176 | ax25_listen_register((ax25_address *)dev->dev_addr, NULL); | |
177 | return 0; | |
178 | } | |
179 | ||
180 | static int nr_close(struct net_device *dev) | |
181 | { | |
182 | ax25_listen_release((ax25_address *)dev->dev_addr, NULL); | |
183 | netif_stop_queue(dev); | |
184 | return 0; | |
185 | } | |
186 | ||
187 | static int nr_xmit(struct sk_buff *skb, struct net_device *dev) | |
188 | { | |
189 | struct net_device_stats *stats = netdev_priv(dev); | |
190 | dev_kfree_skb(skb); | |
191 | stats->tx_errors++; | |
192 | return 0; | |
193 | } | |
194 | ||
195 | static struct net_device_stats *nr_get_stats(struct net_device *dev) | |
196 | { | |
197 | return netdev_priv(dev); | |
198 | } | |
199 | ||
200 | void nr_setup(struct net_device *dev) | |
201 | { | |
202 | SET_MODULE_OWNER(dev); | |
203 | dev->mtu = NR_MAX_PACKET_SIZE; | |
204 | dev->hard_start_xmit = nr_xmit; | |
205 | dev->open = nr_open; | |
206 | dev->stop = nr_close; | |
207 | ||
208 | dev->hard_header = nr_header; | |
209 | dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN; | |
210 | dev->addr_len = AX25_ADDR_LEN; | |
211 | dev->type = ARPHRD_NETROM; | |
212 | dev->tx_queue_len = 40; | |
213 | dev->rebuild_header = nr_rebuild_header; | |
214 | dev->set_mac_address = nr_set_mac_address; | |
215 | ||
216 | /* New-style flags. */ | |
217 | dev->flags = 0; | |
218 | ||
219 | dev->get_stats = nr_get_stats; | |
220 | } |