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Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [net/] [ax25/] [ax25_addr.c] - Blame information for rev 3

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/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
 */
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <net/ax25.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
 
/*
 * The default broadcast address of an interface is QST-0; the default address
 * is LINUX-1.  The null address is defined as a callsign of all spaces with
 * an SSID of zero.
 */
 
const ax25_address ax25_bcast =
        {{'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, 0 << 1}};
const ax25_address ax25_defaddr =
        {{'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, 1 << 1}};
const ax25_address null_ax25_address =
        {{' ' << 1, ' ' << 1, ' ' << 1, ' ' << 1, ' ' << 1, ' ' << 1, 0 << 1}};
 
EXPORT_SYMBOL_GPL(ax25_bcast);
EXPORT_SYMBOL_GPL(ax25_defaddr);
EXPORT_SYMBOL(null_ax25_address);
 
/*
 *      ax25 -> ascii conversion
 */
char *ax2asc(char *buf, const ax25_address *a)
{
        char c, *s;
        int n;
 
        for (n = 0, s = buf; n < 6; n++) {
                c = (a->ax25_call[n] >> 1) & 0x7F;
 
                if (c != ' ') *s++ = c;
        }
 
        *s++ = '-';
 
        if ((n = ((a->ax25_call[6] >> 1) & 0x0F)) > 9) {
                *s++ = '1';
                n -= 10;
        }
 
        *s++ = n + '0';
        *s++ = '\0';
 
        if (*buf == '\0' || *buf == '-')
           return "*";
 
        return buf;
 
}
 
EXPORT_SYMBOL(ax2asc);
 
/*
 *      ascii -> ax25 conversion
 */
void asc2ax(ax25_address *addr, const char *callsign)
{
        const char *s;
        int n;
 
        for (s = callsign, n = 0; n < 6; n++) {
                if (*s != '\0' && *s != '-')
                        addr->ax25_call[n] = *s++;
                else
                        addr->ax25_call[n] = ' ';
                addr->ax25_call[n] <<= 1;
                addr->ax25_call[n] &= 0xFE;
        }
 
        if (*s++ == '\0') {
                addr->ax25_call[6] = 0x00;
                return;
        }
 
        addr->ax25_call[6] = *s++ - '0';
 
        if (*s != '\0') {
                addr->ax25_call[6] *= 10;
                addr->ax25_call[6] += *s++ - '0';
        }
 
        addr->ax25_call[6] <<= 1;
        addr->ax25_call[6] &= 0x1E;
}
 
EXPORT_SYMBOL(asc2ax);
 
/*
 *      Compare two ax.25 addresses
 */
int ax25cmp(const ax25_address *a, const ax25_address *b)
{
        int ct = 0;
 
        while (ct < 6) {
                if ((a->ax25_call[ct] & 0xFE) != (b->ax25_call[ct] & 0xFE))     /* Clean off repeater bits */
                        return 1;
                ct++;
        }
 
        if ((a->ax25_call[ct] & 0x1E) == (b->ax25_call[ct] & 0x1E))     /* SSID without control bit */
                return 0;
 
        return 2;                       /* Partial match */
}
 
EXPORT_SYMBOL(ax25cmp);
 
/*
 *      Compare two AX.25 digipeater paths.
 */
int ax25digicmp(const ax25_digi *digi1, const ax25_digi *digi2)
{
        int i;
 
        if (digi1->ndigi != digi2->ndigi)
                return 1;
 
        if (digi1->lastrepeat != digi2->lastrepeat)
                return 1;
 
        for (i = 0; i < digi1->ndigi; i++)
                if (ax25cmp(&digi1->calls[i], &digi2->calls[i]) != 0)
                        return 1;
 
        return 0;
}
 
/*
 *      Given an AX.25 address pull of to, from, digi list, command/response and the start of data
 *
 */
const unsigned char *ax25_addr_parse(const unsigned char *buf, int len,
        ax25_address *src, ax25_address *dest, ax25_digi *digi, int *flags,
        int *dama)
{
        int d = 0;
 
        if (len < 14) return NULL;
 
        if (flags != NULL) {
                *flags = 0;
 
                if (buf[6] & AX25_CBIT)
                        *flags = AX25_COMMAND;
                if (buf[13] & AX25_CBIT)
                        *flags = AX25_RESPONSE;
        }
 
        if (dama != NULL)
                *dama = ~buf[13] & AX25_DAMA_FLAG;
 
        /* Copy to, from */
        if (dest != NULL)
                memcpy(dest, buf + 0, AX25_ADDR_LEN);
        if (src != NULL)
                memcpy(src,  buf + 7, AX25_ADDR_LEN);
 
        buf += 2 * AX25_ADDR_LEN;
        len -= 2 * AX25_ADDR_LEN;
 
        digi->lastrepeat = -1;
        digi->ndigi      = 0;
 
        while (!(buf[-1] & AX25_EBIT)) {
                if (d >= AX25_MAX_DIGIS)  return NULL;  /* Max of 6 digis */
                if (len < 7) return NULL;       /* Short packet */
 
                memcpy(&digi->calls[d], buf, AX25_ADDR_LEN);
                digi->ndigi = d + 1;
 
                if (buf[6] & AX25_HBIT) {
                        digi->repeated[d] = 1;
                        digi->lastrepeat  = d;
                } else {
                        digi->repeated[d] = 0;
                }
 
                buf += AX25_ADDR_LEN;
                len -= AX25_ADDR_LEN;
                d++;
        }
 
        return buf;
}
 
/*
 *      Assemble an AX.25 header from the bits
 */
int ax25_addr_build(unsigned char *buf, const ax25_address *src,
        const ax25_address *dest, const ax25_digi *d, int flag, int modulus)
{
        int len = 0;
        int ct  = 0;
 
        memcpy(buf, dest, AX25_ADDR_LEN);
        buf[6] &= ~(AX25_EBIT | AX25_CBIT);
        buf[6] |= AX25_SSSID_SPARE;
 
        if (flag == AX25_COMMAND) buf[6] |= AX25_CBIT;
 
        buf += AX25_ADDR_LEN;
        len += AX25_ADDR_LEN;
 
        memcpy(buf, src, AX25_ADDR_LEN);
        buf[6] &= ~(AX25_EBIT | AX25_CBIT);
        buf[6] &= ~AX25_SSSID_SPARE;
 
        if (modulus == AX25_MODULUS)
                buf[6] |= AX25_SSSID_SPARE;
        else
                buf[6] |= AX25_ESSID_SPARE;
 
        if (flag == AX25_RESPONSE) buf[6] |= AX25_CBIT;
 
        /*
         *      Fast path the normal digiless path
         */
        if (d == NULL || d->ndigi == 0) {
                buf[6] |= AX25_EBIT;
                return 2 * AX25_ADDR_LEN;
        }
 
        buf += AX25_ADDR_LEN;
        len += AX25_ADDR_LEN;
 
        while (ct < d->ndigi) {
                memcpy(buf, &d->calls[ct], AX25_ADDR_LEN);
 
                if (d->repeated[ct])
                        buf[6] |= AX25_HBIT;
                else
                        buf[6] &= ~AX25_HBIT;
 
                buf[6] &= ~AX25_EBIT;
                buf[6] |= AX25_SSSID_SPARE;
 
                buf += AX25_ADDR_LEN;
                len += AX25_ADDR_LEN;
                ct++;
        }
 
        buf[-1] |= AX25_EBIT;
 
        return len;
}
 
int ax25_addr_size(const ax25_digi *dp)
{
        if (dp == NULL)
                return 2 * AX25_ADDR_LEN;
 
        return AX25_ADDR_LEN * (2 + dp->ndigi);
}
 
/*
 *      Reverse Digipeat List. May not pass both parameters as same struct
 */
void ax25_digi_invert(const ax25_digi *in, ax25_digi *out)
{
        int ct;
 
        out->ndigi      = in->ndigi;
        out->lastrepeat = in->ndigi - in->lastrepeat - 2;
 
        /* Invert the digipeaters */
        for (ct = 0; ct < in->ndigi; ct++) {
                out->calls[ct] = in->calls[in->ndigi - ct - 1];
 
                if (ct <= out->lastrepeat) {
                        out->calls[ct].ax25_call[6] |= AX25_HBIT;
                        out->repeated[ct]            = 1;
                } else {
                        out->calls[ct].ax25_call[6] &= ~AX25_HBIT;
                        out->repeated[ct]            = 0;
                }
        }
}
 

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Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [net/] [ax25/] [ax25_addr.c] - Blame information for rev 3

Line No.	Rev	Author	Line
1	3	xianfeng	`/*`
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 <asm/system.h>`
26			`#include <linux/fcntl.h>`
27			`#include <linux/mm.h>`
28			`#include <linux/interrupt.h>`
29
30			`/*`
31			`* The default broadcast address of an interface is QST-0; the default address`
32			`* is LINUX-1. The null address is defined as a callsign of all spaces with`
33			`* an SSID of zero.`
34			`*/`
35
36			`const ax25_address ax25_bcast =`
37			`{{'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, 0 << 1}};`
38			`const ax25_address ax25_defaddr =`
39			`{{'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, 1 << 1}};`
40			`const ax25_address null_ax25_address =`
41			`{{' ' << 1, ' ' << 1, ' ' << 1, ' ' << 1, ' ' << 1, ' ' << 1, 0 << 1}};`
42
43			`EXPORT_SYMBOL_GPL(ax25_bcast);`
44			`EXPORT_SYMBOL_GPL(ax25_defaddr);`
45			`EXPORT_SYMBOL(null_ax25_address);`
46
47			`/*`
48			`* ax25 -> ascii conversion`
49			`*/`
50			`char ax2asc(char buf, const ax25_address *a)`
51			`{`
52			`char c, *s;`
53			`int n;`
54
55			`for (n = 0, s = buf; n < 6; n++) {`
56			`c = (a->ax25_call[n] >> 1) & 0x7F;`
57
58			`if (c != ' ') *s++ = c;`
59			`}`
60
61			`*s++ = '-';`
62
63			`if ((n = ((a->ax25_call[6] >> 1) & 0x0F)) > 9) {`
64			`*s++ = '1';`
65			`n -= 10;`
66			`}`
67
68			`*s++ = n + '0';`
69			`*s++ = '\0';`
70
71			`if (buf == '\0' \|\| buf == '-')`
72			`return "*";`
73
74			`return buf;`
75
76			`}`
77
78			`EXPORT_SYMBOL(ax2asc);`
79
80			`/*`
81			`* ascii -> ax25 conversion`
82			`*/`
83			`void asc2ax(ax25_address addr, const char callsign)`
84			`{`
85			`const char *s;`
86			`int n;`
87
88			`for (s = callsign, n = 0; n < 6; n++) {`
89			`if (s != '\0' && s != '-')`
90			`addr->ax25_call[n] = *s++;`
91			`else`
92			`addr->ax25_call[n] = ' ';`
93			`addr->ax25_call[n] <<= 1;`
94			`addr->ax25_call[n] &= 0xFE;`
95			`}`
96
97			`if (*s++ == '\0') {`
98			`addr->ax25_call[6] = 0x00;`
99			`return;`
100			`}`
101
102			`addr->ax25_call[6] = *s++ - '0';`
103
104			`if (*s != '\0') {`
105			`addr->ax25_call[6] *= 10;`
106			`addr->ax25_call[6] += *s++ - '0';`
107			`}`
108
109			`addr->ax25_call[6] <<= 1;`
110			`addr->ax25_call[6] &= 0x1E;`
111			`}`
112
113			`EXPORT_SYMBOL(asc2ax);`
114
115			`/*`
116			`* Compare two ax.25 addresses`
117			`*/`
118			`int ax25cmp(const ax25_address a, const ax25_address b)`
119			`{`
120			`int ct = 0;`
121
122			`while (ct < 6) {`
123			`if ((a->ax25_call[ct] & 0xFE) != (b->ax25_call[ct] & 0xFE)) /* Clean off repeater bits */`
124			`return 1;`
125			`ct++;`
126			`}`
127
128			`if ((a->ax25_call[ct] & 0x1E) == (b->ax25_call[ct] & 0x1E)) /* SSID without control bit */`
129			`return 0;`
130
131			`return 2; /* Partial match */`
132			`}`
133
134			`EXPORT_SYMBOL(ax25cmp);`
135
136			`/*`
137			`* Compare two AX.25 digipeater paths.`
138			`*/`
139			`int ax25digicmp(const ax25_digi digi1, const ax25_digi digi2)`
140			`{`
141			`int i;`
142
143			`if (digi1->ndigi != digi2->ndigi)`
144			`return 1;`
145
146			`if (digi1->lastrepeat != digi2->lastrepeat)`
147			`return 1;`
148
149			`for (i = 0; i < digi1->ndigi; i++)`
150			`if (ax25cmp(&digi1->calls[i], &digi2->calls[i]) != 0)`
151			`return 1;`
152
153			`return 0;`
154			`}`
155
156			`/*`
157			`* Given an AX.25 address pull of to, from, digi list, command/response and the start of data`
158			`*`
159			`*/`
160			`const unsigned char ax25_addr_parse(const unsigned char buf, int len,`
161			`ax25_address src, ax25_address dest, ax25_digi digi, int flags,`
162			`int *dama)`
163			`{`
164			`int d = 0;`
165
166			`if (len < 14) return NULL;`
167
168			`if (flags != NULL) {`
169			`*flags = 0;`
170
171			`if (buf[6] & AX25_CBIT)`
172			`*flags = AX25_COMMAND;`
173			`if (buf[13] & AX25_CBIT)`
174			`*flags = AX25_RESPONSE;`
175			`}`
176
177			`if (dama != NULL)`
178			`*dama = ~buf[13] & AX25_DAMA_FLAG;`
179
180			`/* Copy to, from */`
181			`if (dest != NULL)`
182			`memcpy(dest, buf + 0, AX25_ADDR_LEN);`
183			`if (src != NULL)`
184			`memcpy(src, buf + 7, AX25_ADDR_LEN);`
185
186			`buf += 2 * AX25_ADDR_LEN;`
187			`len -= 2 * AX25_ADDR_LEN;`
188
189			`digi->lastrepeat = -1;`
190			`digi->ndigi = 0;`
191
192			`while (!(buf[-1] & AX25_EBIT)) {`
193			`if (d >= AX25_MAX_DIGIS) return NULL; /* Max of 6 digis */`
194			`if (len < 7) return NULL; /* Short packet */`
195
196			`memcpy(&digi->calls[d], buf, AX25_ADDR_LEN);`
197			`digi->ndigi = d + 1;`
198
199			`if (buf[6] & AX25_HBIT) {`
200			`digi->repeated[d] = 1;`
201			`digi->lastrepeat = d;`
202			`} else {`
203			`digi->repeated[d] = 0;`
204			`}`
205
206			`buf += AX25_ADDR_LEN;`
207			`len -= AX25_ADDR_LEN;`
208			`d++;`
209			`}`
210
211			`return buf;`
212			`}`
213
214			`/*`
215			`* Assemble an AX.25 header from the bits`
216			`*/`
217			`int ax25_addr_build(unsigned char buf, const ax25_address src,`
218			`const ax25_address dest, const ax25_digi d, int flag, int modulus)`
219			`{`
220			`int len = 0;`
221			`int ct = 0;`
222
223			`memcpy(buf, dest, AX25_ADDR_LEN);`
224			`buf[6] &= ~(AX25_EBIT \| AX25_CBIT);`
225			`buf[6] \|= AX25_SSSID_SPARE;`
226
227			`if (flag == AX25_COMMAND) buf[6] \|= AX25_CBIT;`
228
229			`buf += AX25_ADDR_LEN;`
230			`len += AX25_ADDR_LEN;`
231
232			`memcpy(buf, src, AX25_ADDR_LEN);`
233			`buf[6] &= ~(AX25_EBIT \| AX25_CBIT);`
234			`buf[6] &= ~AX25_SSSID_SPARE;`
235
236			`if (modulus == AX25_MODULUS)`
237			`buf[6] \|= AX25_SSSID_SPARE;`
238			`else`
239			`buf[6] \|= AX25_ESSID_SPARE;`
240
241			`if (flag == AX25_RESPONSE) buf[6] \|= AX25_CBIT;`
242
243			`/*`
244			`* Fast path the normal digiless path`
245			`*/`
246			`if (d == NULL \|\| d->ndigi == 0) {`
247			`buf[6] \|= AX25_EBIT;`
248			`return 2 * AX25_ADDR_LEN;`
249			`}`
250
251			`buf += AX25_ADDR_LEN;`
252			`len += AX25_ADDR_LEN;`
253
254			`while (ct < d->ndigi) {`
255			`memcpy(buf, &d->calls[ct], AX25_ADDR_LEN);`
256
257			`if (d->repeated[ct])`
258			`buf[6] \|= AX25_HBIT;`
259			`else`
260			`buf[6] &= ~AX25_HBIT;`
261
262			`buf[6] &= ~AX25_EBIT;`
263			`buf[6] \|= AX25_SSSID_SPARE;`
264
265			`buf += AX25_ADDR_LEN;`
266			`len += AX25_ADDR_LEN;`
267			`ct++;`
268			`}`
269
270			`buf[-1] \|= AX25_EBIT;`
271
272			`return len;`
273			`}`
274
275			`int ax25_addr_size(const ax25_digi *dp)`
276			`{`
277			`if (dp == NULL)`
278			`return 2 * AX25_ADDR_LEN;`
279
280			`return AX25_ADDR_LEN * (2 + dp->ndigi);`
281			`}`
282
283			`/*`
284			`* Reverse Digipeat List. May not pass both parameters as same struct`
285			`*/`
286			`void ax25_digi_invert(const ax25_digi in, ax25_digi out)`
287			`{`
288			`int ct;`
289
290			`out->ndigi = in->ndigi;`
291			`out->lastrepeat = in->ndigi - in->lastrepeat - 2;`
292
293			`/* Invert the digipeaters */`
294			`for (ct = 0; ct < in->ndigi; ct++) {`
295			`out->calls[ct] = in->calls[in->ndigi - ct - 1];`
296
297			`if (ct <= out->lastrepeat) {`
298			`out->calls[ct].ax25_call[6] \|= AX25_HBIT;`
299			`out->repeated[ct] = 1;`
300			`} else {`
301			`out->calls[ct].ax25_call[6] &= ~AX25_HBIT;`
302			`out->repeated[ct] = 0;`
303			`}`
304			`}`
305			`}`
306