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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 <linux/fcntl.h> |
28 | #include <linux/termios.h> /* For TIOCINQ/OUTQ */ |
29 | #include <linux/mm.h> |
30 | #include <linux/interrupt.h> |
31 | #include <linux/notifier.h> |
32 | #include <linux/proc_fs.h> |
33 | #include <linux/stat.h> |
34 | #include <linux/netfilter.h> |
35 | #include <linux/sysctl.h> |
36 | #include <net/ip.h> |
37 | #include <net/arp.h> |
38 | |
39 | /* |
40 | * IP over AX.25 encapsulation. |
41 | */ |
42 | |
43 | /* |
44 | * Shove an AX.25 UI header on an IP packet and handle ARP |
45 | */ |
46 | |
47 | #ifdef CONFIG_INET |
48 | |
49 | int ax25_hard_header(struct sk_buff *skb, struct net_device *dev, |
50 | unsigned short type, const void *daddr, |
51 | const void *saddr, unsigned int len) |
52 | { |
53 | unsigned char *buff; |
54 | |
55 | /* they sometimes come back to us... */ |
56 | if (type == ETH_P_AX25) |
57 | return 0; |
58 | |
59 | /* header is an AX.25 UI frame from us to them */ |
60 | buff = skb_push(skb, AX25_HEADER_LEN); |
61 | *buff++ = 0x00; /* KISS DATA */ |
62 | |
63 | if (daddr != NULL) |
64 | memcpy(buff, daddr, dev->addr_len); /* Address specified */ |
65 | |
66 | buff[6] &= ~AX25_CBIT; |
67 | buff[6] &= ~AX25_EBIT; |
68 | buff[6] |= AX25_SSSID_SPARE; |
69 | buff += AX25_ADDR_LEN; |
70 | |
71 | if (saddr != NULL) |
72 | memcpy(buff, saddr, dev->addr_len); |
73 | else |
74 | memcpy(buff, dev->dev_addr, dev->addr_len); |
75 | |
76 | buff[6] &= ~AX25_CBIT; |
77 | buff[6] |= AX25_EBIT; |
78 | buff[6] |= AX25_SSSID_SPARE; |
79 | buff += AX25_ADDR_LEN; |
80 | |
81 | *buff++ = AX25_UI; /* UI */ |
82 | |
83 | /* Append a suitable AX.25 PID */ |
84 | switch (type) { |
85 | case ETH_P_IP: |
86 | *buff++ = AX25_P_IP; |
87 | break; |
88 | case ETH_P_ARP: |
89 | *buff++ = AX25_P_ARP; |
90 | break; |
91 | default: |
92 | printk(KERN_ERR "AX.25: ax25_hard_header - wrong protocol type 0x%2.2x\n", type); |
93 | *buff++ = 0; |
94 | break; |
95 | } |
96 | |
97 | if (daddr != NULL) |
98 | return AX25_HEADER_LEN; |
99 | |
100 | return -AX25_HEADER_LEN; /* Unfinished header */ |
101 | } |
102 | |
103 | int ax25_rebuild_header(struct sk_buff *skb) |
104 | { |
105 | struct sk_buff *ourskb; |
106 | unsigned char *bp = skb->data; |
107 | ax25_route *route; |
108 | struct net_device *dev = NULL; |
109 | ax25_address *src, *dst; |
110 | ax25_digi *digipeat = NULL; |
111 | ax25_dev *ax25_dev; |
112 | ax25_cb *ax25; |
113 | char ip_mode = ' '; |
114 | |
115 | dst = (ax25_address *)(bp + 1); |
116 | src = (ax25_address *)(bp + 8); |
117 | |
118 | if (arp_find(bp + 1, skb)) |
119 | return 1; |
120 | |
121 | route = ax25_get_route(dst, NULL); |
122 | if (route) { |
123 | digipeat = route->digipeat; |
124 | dev = route->dev; |
125 | ip_mode = route->ip_mode; |
126 | } |
127 | |
128 | if (dev == NULL) |
129 | dev = skb->dev; |
130 | |
131 | if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) { |
132 | goto put; |
133 | } |
134 | |
135 | if (bp[16] == AX25_P_IP) { |
136 | if (ip_mode == 'V' || (ip_mode == ' ' && ax25_dev->values[AX25_VALUES_IPDEFMODE])) { |
137 | /* |
138 | * We copy the buffer and release the original thereby |
139 | * keeping it straight |
140 | * |
141 | * Note: we report 1 back so the caller will |
142 | * not feed the frame direct to the physical device |
143 | * We don't want that to happen. (It won't be upset |
144 | * as we have pulled the frame from the queue by |
145 | * freeing it). |
146 | * |
147 | * NB: TCP modifies buffers that are still |
148 | * on a device queue, thus we use skb_copy() |
149 | * instead of using skb_clone() unless this |
150 | * gets fixed. |
151 | */ |
152 | |
153 | ax25_address src_c; |
154 | ax25_address dst_c; |
155 | |
156 | if ((ourskb = skb_copy(skb, GFP_ATOMIC)) == NULL) { |
157 | kfree_skb(skb); |
158 | goto put; |
159 | } |
160 | |
161 | if (skb->sk != NULL) |
162 | skb_set_owner_w(ourskb, skb->sk); |
163 | |
164 | kfree_skb(skb); |
165 | /* dl9sau: bugfix |
166 | * after kfree_skb(), dst and src which were pointer |
167 | * to bp which is part of skb->data would not be valid |
168 | * anymore hope that after skb_pull(ourskb, ..) our |
169 | * dsc_c and src_c will not become invalid |
170 | */ |
171 | bp = ourskb->data; |
172 | dst_c = *(ax25_address *)(bp + 1); |
173 | src_c = *(ax25_address *)(bp + 8); |
174 | |
175 | skb_pull(ourskb, AX25_HEADER_LEN - 1); /* Keep PID */ |
176 | skb_reset_network_header(ourskb); |
177 | |
178 | ax25=ax25_send_frame( |
179 | ourskb, |
180 | ax25_dev->values[AX25_VALUES_PACLEN], |
181 | &src_c, |
182 | &dst_c, digipeat, dev); |
183 | if (ax25) { |
184 | ax25_cb_put(ax25); |
185 | } |
186 | goto put; |
187 | } |
188 | } |
189 | |
190 | bp[7] &= ~AX25_CBIT; |
191 | bp[7] &= ~AX25_EBIT; |
192 | bp[7] |= AX25_SSSID_SPARE; |
193 | |
194 | bp[14] &= ~AX25_CBIT; |
195 | bp[14] |= AX25_EBIT; |
196 | bp[14] |= AX25_SSSID_SPARE; |
197 | |
198 | skb_pull(skb, AX25_KISS_HEADER_LEN); |
199 | |
200 | if (digipeat != NULL) { |
201 | if ((ourskb = ax25_rt_build_path(skb, src, dst, route->digipeat)) == NULL) { |
202 | kfree_skb(skb); |
203 | goto put; |
204 | } |
205 | |
206 | skb = ourskb; |
207 | } |
208 | |
209 | ax25_queue_xmit(skb, dev); |
210 | |
211 | put: |
212 | if (route) |
213 | ax25_put_route(route); |
214 | |
215 | return 1; |
216 | } |
217 | |
218 | #else /* INET */ |
219 | |
220 | int ax25_hard_header(struct sk_buff *skb, struct net_device *dev, |
221 | unsigned short type, const void *daddr, |
222 | const void *saddr, unsigned int len) |
223 | { |
224 | return -AX25_HEADER_LEN; |
225 | } |
226 | |
227 | int ax25_rebuild_header(struct sk_buff *skb) |
228 | { |
229 | return 1; |
230 | } |
231 | |
232 | #endif |
233 | |
234 | const struct header_ops ax25_header_ops = { |
235 | .create = ax25_hard_header, |
236 | .rebuild = ax25_rebuild_header, |
237 | }; |
238 | |
239 | EXPORT_SYMBOL(ax25_hard_header); |
240 | EXPORT_SYMBOL(ax25_rebuild_header); |
241 | EXPORT_SYMBOL(ax25_header_ops); |
242 | |
243 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9