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Linux/net/ax25/ax25_addr.c

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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 <net/ax25.h>
 20 #include <linux/inet.h>
 21 #include <linux/netdevice.h>
 22 #include <linux/skbuff.h>
 23 #include <net/sock.h>
 24 #include <asm/uaccess.h>
 25 #include <linux/fcntl.h>
 26 #include <linux/mm.h>
 27 #include <linux/interrupt.h>
 28 
 29 /*
 30  * The default broadcast address of an interface is QST-0; the default address
 31  * is LINUX-1.  The null address is defined as a callsign of all spaces with
 32  * an SSID of zero.
 33  */
 34 
 35 const ax25_address ax25_bcast =
 36         {{'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, 0 << 1}};
 37 const ax25_address ax25_defaddr =
 38         {{'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, 1 << 1}};
 39 const ax25_address null_ax25_address =
 40         {{' ' << 1, ' ' << 1, ' ' << 1, ' ' << 1, ' ' << 1, ' ' << 1, 0 << 1}};
 41 
 42 EXPORT_SYMBOL_GPL(ax25_bcast);
 43 EXPORT_SYMBOL_GPL(ax25_defaddr);
 44 EXPORT_SYMBOL(null_ax25_address);
 45 
 46 /*
 47  *      ax25 -> ascii conversion
 48  */
 49 char *ax2asc(char *buf, const ax25_address *a)
 50 {
 51         char c, *s;
 52         int n;
 53 
 54         for (n = 0, s = buf; n < 6; n++) {
 55                 c = (a->ax25_call[n] >> 1) & 0x7F;
 56 
 57                 if (c != ' ') *s++ = c;
 58         }
 59 
 60         *s++ = '-';
 61 
 62         if ((n = ((a->ax25_call[6] >> 1) & 0x0F)) > 9) {
 63                 *s++ = '1';
 64                 n -= 10;
 65         }
 66 
 67         *s++ = n + '';
 68         *s++ = '\0';
 69 
 70         if (*buf == '\0' || *buf == '-')
 71            return "*";
 72 
 73         return buf;
 74 
 75 }
 76 
 77 EXPORT_SYMBOL(ax2asc);
 78 
 79 /*
 80  *      ascii -> ax25 conversion
 81  */
 82 void asc2ax(ax25_address *addr, const char *callsign)
 83 {
 84         const char *s;
 85         int n;
 86 
 87         for (s = callsign, n = 0; n < 6; n++) {
 88                 if (*s != '\0' && *s != '-')
 89                         addr->ax25_call[n] = *s++;
 90                 else
 91                         addr->ax25_call[n] = ' ';
 92                 addr->ax25_call[n] <<= 1;
 93                 addr->ax25_call[n] &= 0xFE;
 94         }
 95 
 96         if (*s++ == '\0') {
 97                 addr->ax25_call[6] = 0x00;
 98                 return;
 99         }
100 
101         addr->ax25_call[6] = *s++ - '';
102 
103         if (*s != '\0') {
104                 addr->ax25_call[6] *= 10;
105                 addr->ax25_call[6] += *s++ - '';
106         }
107 
108         addr->ax25_call[6] <<= 1;
109         addr->ax25_call[6] &= 0x1E;
110 }
111 
112 EXPORT_SYMBOL(asc2ax);
113 
114 /*
115  *      Compare two ax.25 addresses
116  */
117 int ax25cmp(const ax25_address *a, const ax25_address *b)
118 {
119         int ct = 0;
120 
121         while (ct < 6) {
122                 if ((a->ax25_call[ct] & 0xFE) != (b->ax25_call[ct] & 0xFE))     /* Clean off repeater bits */
123                         return 1;
124                 ct++;
125         }
126 
127         if ((a->ax25_call[ct] & 0x1E) == (b->ax25_call[ct] & 0x1E))     /* SSID without control bit */
128                 return 0;
129 
130         return 2;                       /* Partial match */
131 }
132 
133 EXPORT_SYMBOL(ax25cmp);
134 
135 /*
136  *      Compare two AX.25 digipeater paths.
137  */
138 int ax25digicmp(const ax25_digi *digi1, const ax25_digi *digi2)
139 {
140         int i;
141 
142         if (digi1->ndigi != digi2->ndigi)
143                 return 1;
144 
145         if (digi1->lastrepeat != digi2->lastrepeat)
146                 return 1;
147 
148         for (i = 0; i < digi1->ndigi; i++)
149                 if (ax25cmp(&digi1->calls[i], &digi2->calls[i]) != 0)
150                         return 1;
151 
152         return 0;
153 }
154 
155 /*
156  *      Given an AX.25 address pull of to, from, digi list, command/response and the start of data
157  *
158  */
159 const unsigned char *ax25_addr_parse(const unsigned char *buf, int len,
160         ax25_address *src, ax25_address *dest, ax25_digi *digi, int *flags,
161         int *dama)
162 {
163         int d = 0;
164 
165         if (len < 14) return NULL;
166 
167         if (flags != NULL) {
168                 *flags = 0;
169 
170                 if (buf[6] & AX25_CBIT)
171                         *flags = AX25_COMMAND;
172                 if (buf[13] & AX25_CBIT)
173                         *flags = AX25_RESPONSE;
174         }
175 
176         if (dama != NULL)
177                 *dama = ~buf[13] & AX25_DAMA_FLAG;
178 
179         /* Copy to, from */
180         if (dest != NULL)
181                 memcpy(dest, buf + 0, AX25_ADDR_LEN);
182         if (src != NULL)
183                 memcpy(src,  buf + 7, AX25_ADDR_LEN);
184 
185         buf += 2 * AX25_ADDR_LEN;
186         len -= 2 * AX25_ADDR_LEN;
187 
188         digi->lastrepeat = -1;
189         digi->ndigi      = 0;
190 
191         while (!(buf[-1] & AX25_EBIT)) {
192                 if (d >= AX25_MAX_DIGIS)
193                         return NULL;
194                 if (len < AX25_ADDR_LEN)
195                         return NULL;
196 
197                 memcpy(&digi->calls[d], buf, AX25_ADDR_LEN);
198                 digi->ndigi = d + 1;
199 
200                 if (buf[6] & AX25_HBIT) {
201                         digi->repeated[d] = 1;
202                         digi->lastrepeat  = d;
203                 } else {
204                         digi->repeated[d] = 0;
205                 }
206 
207                 buf += AX25_ADDR_LEN;
208                 len -= AX25_ADDR_LEN;
209                 d++;
210         }
211 
212         return buf;
213 }
214 
215 /*
216  *      Assemble an AX.25 header from the bits
217  */
218 int ax25_addr_build(unsigned char *buf, const ax25_address *src,
219         const ax25_address *dest, const ax25_digi *d, int flag, int modulus)
220 {
221         int len = 0;
222         int ct  = 0;
223 
224         memcpy(buf, dest, AX25_ADDR_LEN);
225         buf[6] &= ~(AX25_EBIT | AX25_CBIT);
226         buf[6] |= AX25_SSSID_SPARE;
227 
228         if (flag == AX25_COMMAND) buf[6] |= AX25_CBIT;
229 
230         buf += AX25_ADDR_LEN;
231         len += AX25_ADDR_LEN;
232 
233         memcpy(buf, src, AX25_ADDR_LEN);
234         buf[6] &= ~(AX25_EBIT | AX25_CBIT);
235         buf[6] &= ~AX25_SSSID_SPARE;
236 
237         if (modulus == AX25_MODULUS)
238                 buf[6] |= AX25_SSSID_SPARE;
239         else
240                 buf[6] |= AX25_ESSID_SPARE;
241 
242         if (flag == AX25_RESPONSE) buf[6] |= AX25_CBIT;
243 
244         /*
245          *      Fast path the normal digiless path
246          */
247         if (d == NULL || d->ndigi == 0) {
248                 buf[6] |= AX25_EBIT;
249                 return 2 * AX25_ADDR_LEN;
250         }
251 
252         buf += AX25_ADDR_LEN;
253         len += AX25_ADDR_LEN;
254 
255         while (ct < d->ndigi) {
256                 memcpy(buf, &d->calls[ct], AX25_ADDR_LEN);
257 
258                 if (d->repeated[ct])
259                         buf[6] |= AX25_HBIT;
260                 else
261                         buf[6] &= ~AX25_HBIT;
262 
263                 buf[6] &= ~AX25_EBIT;
264                 buf[6] |= AX25_SSSID_SPARE;
265 
266                 buf += AX25_ADDR_LEN;
267                 len += AX25_ADDR_LEN;
268                 ct++;
269         }
270 
271         buf[-1] |= AX25_EBIT;
272 
273         return len;
274 }
275 
276 int ax25_addr_size(const ax25_digi *dp)
277 {
278         if (dp == NULL)
279                 return 2 * AX25_ADDR_LEN;
280 
281         return AX25_ADDR_LEN * (2 + dp->ndigi);
282 }
283 
284 /*
285  *      Reverse Digipeat List. May not pass both parameters as same struct
286  */
287 void ax25_digi_invert(const ax25_digi *in, ax25_digi *out)
288 {
289         int ct;
290 
291         out->ndigi      = in->ndigi;
292         out->lastrepeat = in->ndigi - in->lastrepeat - 2;
293 
294         /* Invert the digipeaters */
295         for (ct = 0; ct < in->ndigi; ct++) {
296                 out->calls[ct] = in->calls[in->ndigi - ct - 1];
297 
298                 if (ct <= out->lastrepeat) {
299                         out->calls[ct].ax25_call[6] |= AX25_HBIT;
300                         out->repeated[ct]            = 1;
301                 } else {
302                         out->calls[ct].ax25_call[6] &= ~AX25_HBIT;
303                         out->repeated[ct]            = 0;
304                 }
305         }
306 }
307 
308 

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