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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 (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) |
8 | */ |
9 | #include <linux/errno.h> |
10 | #include <linux/types.h> |
11 | #include <linux/socket.h> |
12 | #include <linux/in.h> |
13 | #include <linux/kernel.h> |
14 | #include <linux/module.h> |
15 | #include <linux/timer.h> |
16 | #include <linux/string.h> |
17 | #include <linux/sockios.h> |
18 | #include <linux/net.h> |
19 | #include <linux/slab.h> |
20 | #include <net/ax25.h> |
21 | #include <linux/inet.h> |
22 | #include <linux/netdevice.h> |
23 | #include <linux/if_arp.h> |
24 | #include <linux/skbuff.h> |
25 | #include <net/sock.h> |
26 | #include <asm/uaccess.h> |
27 | #include <asm/system.h> |
28 | #include <linux/fcntl.h> |
29 | #include <linux/termios.h> /* For TIOCINQ/OUTQ */ |
30 | #include <linux/mm.h> |
31 | #include <linux/interrupt.h> |
32 | #include <linux/notifier.h> |
33 | #include <linux/proc_fs.h> |
34 | #include <linux/stat.h> |
35 | #include <linux/netfilter.h> |
36 | #include <linux/sysctl.h> |
37 | #include <net/ip.h> |
38 | #include <net/arp.h> |
39 | |
40 | /* |
41 | * IP over AX.25 encapsulation. |
42 | */ |
43 | |
44 | /* |
45 | * Shove an AX.25 UI header on an IP packet and handle ARP |
46 | */ |
47 | |
48 | #ifdef CONFIG_INET |
49 | |
50 | int ax25_hard_header(struct sk_buff *skb, struct net_device *dev, |
51 | unsigned short type, const void *daddr, |
52 | const void *saddr, unsigned len) |
53 | { |
54 | unsigned char *buff; |
55 | |
56 | /* they sometimes come back to us... */ |
57 | if (type == ETH_P_AX25) |
58 | return 0; |
59 | |
60 | /* header is an AX.25 UI frame from us to them */ |
61 | buff = skb_push(skb, AX25_HEADER_LEN); |
62 | *buff++ = 0x00; /* KISS DATA */ |
63 | |
64 | if (daddr != NULL) |
65 | memcpy(buff, daddr, dev->addr_len); /* Address specified */ |
66 | |
67 | buff[6] &= ~AX25_CBIT; |
68 | buff[6] &= ~AX25_EBIT; |
69 | buff[6] |= AX25_SSSID_SPARE; |
70 | buff += AX25_ADDR_LEN; |
71 | |
72 | if (saddr != NULL) |
73 | memcpy(buff, saddr, dev->addr_len); |
74 | else |
75 | memcpy(buff, dev->dev_addr, dev->addr_len); |
76 | |
77 | buff[6] &= ~AX25_CBIT; |
78 | buff[6] |= AX25_EBIT; |
79 | buff[6] |= AX25_SSSID_SPARE; |
80 | buff += AX25_ADDR_LEN; |
81 | |
82 | *buff++ = AX25_UI; /* UI */ |
83 | |
84 | /* Append a suitable AX.25 PID */ |
85 | switch (type) { |
86 | case ETH_P_IP: |
87 | *buff++ = AX25_P_IP; |
88 | break; |
89 | case ETH_P_ARP: |
90 | *buff++ = AX25_P_ARP; |
91 | break; |
92 | default: |
93 | printk(KERN_ERR "AX.25: ax25_hard_header - wrong protocol type 0x%2.2x\n", type); |
94 | *buff++ = 0; |
95 | break; |
96 | } |
97 | |
98 | if (daddr != NULL) |
99 | return AX25_HEADER_LEN; |
100 | |
101 | return -AX25_HEADER_LEN; /* Unfinished header */ |
102 | } |
103 | |
104 | int ax25_rebuild_header(struct sk_buff *skb) |
105 | { |
106 | struct sk_buff *ourskb; |
107 | unsigned char *bp = skb->data; |
108 | ax25_route *route; |
109 | struct net_device *dev = NULL; |
110 | ax25_address *src, *dst; |
111 | ax25_digi *digipeat = NULL; |
112 | ax25_dev *ax25_dev; |
113 | ax25_cb *ax25; |
114 | char ip_mode = ' '; |
115 | |
116 | dst = (ax25_address *)(bp + 1); |
117 | src = (ax25_address *)(bp + 8); |
118 | |
119 | if (arp_find(bp + 1, skb)) |
120 | return 1; |
121 | |
122 | route = ax25_get_route(dst, NULL); |
123 | if (route) { |
124 | digipeat = route->digipeat; |
125 | dev = route->dev; |
126 | ip_mode = route->ip_mode; |
127 | } |
128 | |
129 | if (dev == NULL) |
130 | dev = skb->dev; |
131 | |
132 | if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) { |
133 | goto put; |
134 | } |
135 | |
136 | if (bp[16] == AX25_P_IP) { |
137 | if (ip_mode == 'V' || (ip_mode == ' ' && ax25_dev->values[AX25_VALUES_IPDEFMODE])) { |
138 | /* |
139 | * We copy the buffer and release the original thereby |
140 | * keeping it straight |
141 | * |
142 | * Note: we report 1 back so the caller will |
143 | * not feed the frame direct to the physical device |
144 | * We don't want that to happen. (It won't be upset |
145 | * as we have pulled the frame from the queue by |
146 | * freeing it). |
147 | * |
148 | * NB: TCP modifies buffers that are still |
149 | * on a device queue, thus we use skb_copy() |
150 | * instead of using skb_clone() unless this |
151 | * gets fixed. |
152 | */ |
153 | |
154 | ax25_address src_c; |
155 | ax25_address dst_c; |
156 | |
157 | if ((ourskb = skb_copy(skb, GFP_ATOMIC)) == NULL) { |
158 | kfree_skb(skb); |
159 | goto put; |
160 | } |
161 | |
162 | if (skb->sk != NULL) |
163 | skb_set_owner_w(ourskb, skb->sk); |
164 | |
165 | kfree_skb(skb); |
166 | /* dl9sau: bugfix |
167 | * after kfree_skb(), dst and src which were pointer |
168 | * to bp which is part of skb->data would not be valid |
169 | * anymore hope that after skb_pull(ourskb, ..) our |
170 | * dsc_c and src_c will not become invalid |
171 | */ |
172 | bp = ourskb->data; |
173 | dst_c = *(ax25_address *)(bp + 1); |
174 | src_c = *(ax25_address *)(bp + 8); |
175 | |
176 | skb_pull(ourskb, AX25_HEADER_LEN - 1); /* Keep PID */ |
177 | skb_reset_network_header(ourskb); |
178 | |
179 | ax25=ax25_send_frame( |
180 | ourskb, |
181 | ax25_dev->values[AX25_VALUES_PACLEN], |
182 | &src_c, |
183 | &dst_c, digipeat, dev); |
184 | if (ax25) { |
185 | ax25_cb_put(ax25); |
186 | } |
187 | goto put; |
188 | } |
189 | } |
190 | |
191 | bp[7] &= ~AX25_CBIT; |
192 | bp[7] &= ~AX25_EBIT; |
193 | bp[7] |= AX25_SSSID_SPARE; |
194 | |
195 | bp[14] &= ~AX25_CBIT; |
196 | bp[14] |= AX25_EBIT; |
197 | bp[14] |= AX25_SSSID_SPARE; |
198 | |
199 | skb_pull(skb, AX25_KISS_HEADER_LEN); |
200 | |
201 | if (digipeat != NULL) { |
202 | if ((ourskb = ax25_rt_build_path(skb, src, dst, route->digipeat)) == NULL) { |
203 | kfree_skb(skb); |
204 | goto put; |
205 | } |
206 | |
207 | skb = ourskb; |
208 | } |
209 | |
210 | ax25_queue_xmit(skb, dev); |
211 | |
212 | put: |
213 | if (route) |
214 | ax25_put_route(route); |
215 | |
216 | return 1; |
217 | } |
218 | |
219 | #else /* INET */ |
220 | |
221 | int ax25_hard_header(struct sk_buff *skb, struct net_device *dev, |
222 | unsigned short type, const void *daddr, |
223 | const void *saddr, unsigned len) |
224 | { |
225 | return -AX25_HEADER_LEN; |
226 | } |
227 | |
228 | int ax25_rebuild_header(struct sk_buff *skb) |
229 | { |
230 | return 1; |
231 | } |
232 | |
233 | #endif |
234 | |
235 | const struct header_ops ax25_header_ops = { |
236 | .create = ax25_hard_header, |
237 | .rebuild = ax25_rebuild_header, |
238 | }; |
239 | |
240 | EXPORT_SYMBOL(ax25_hard_header); |
241 | EXPORT_SYMBOL(ax25_rebuild_header); |
242 | EXPORT_SYMBOL(ax25_header_ops); |
243 | |
244 |
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v2.6.34-rc5
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