Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/socket.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/in.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/sockios.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/net.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <net/ax25.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/inet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <net/sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27)  * The default broadcast address of an interface is QST-0; the default address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28)  * is LINUX-1.  The null address is defined as a callsign of all spaces with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29)  * an SSID of zero.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) const ax25_address ax25_bcast =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	{{'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, 0 << 1}};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) const ax25_address ax25_defaddr =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	{{'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, 1 << 1}};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) const ax25_address null_ax25_address =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	{{' ' << 1, ' ' << 1, ' ' << 1, ' ' << 1, ' ' << 1, ' ' << 1, 0 << 1}};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) EXPORT_SYMBOL_GPL(ax25_bcast);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) EXPORT_SYMBOL_GPL(ax25_defaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) EXPORT_SYMBOL(null_ax25_address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44)  *	ax25 -> ascii conversion
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) char *ax2asc(char *buf, const ax25_address *a)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	char c, *s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	int n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	for (n = 0, s = buf; n < 6; n++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		c = (a->ax25_call[n] >> 1) & 0x7F;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 		if (c != ' ') *s++ = c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	*s++ = '-';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	if ((n = ((a->ax25_call[6] >> 1) & 0x0F)) > 9) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		*s++ = '1';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		n -= 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	*s++ = n + '0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	*s++ = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	if (*buf == '\0' || *buf == '-')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	   return "*";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	return buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) EXPORT_SYMBOL(ax2asc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77)  *	ascii -> ax25 conversion
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) void asc2ax(ax25_address *addr, const char *callsign)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	const char *s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	int n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	for (s = callsign, n = 0; n < 6; n++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		if (*s != '\0' && *s != '-')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 			addr->ax25_call[n] = *s++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 			addr->ax25_call[n] = ' ';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		addr->ax25_call[n] <<= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		addr->ax25_call[n] &= 0xFE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	if (*s++ == '\0') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		addr->ax25_call[6] = 0x00;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	addr->ax25_call[6] = *s++ - '0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	if (*s != '\0') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		addr->ax25_call[6] *= 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		addr->ax25_call[6] += *s++ - '0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	addr->ax25_call[6] <<= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	addr->ax25_call[6] &= 0x1E;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) EXPORT_SYMBOL(asc2ax);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)  *	Compare two ax.25 addresses
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) int ax25cmp(const ax25_address *a, const ax25_address *b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	int ct = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	while (ct < 6) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		if ((a->ax25_call[ct] & 0xFE) != (b->ax25_call[ct] & 0xFE))	/* Clean off repeater bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 			return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		ct++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	if ((a->ax25_call[ct] & 0x1E) == (b->ax25_call[ct] & 0x1E))	/* SSID without control bit */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	return 2;			/* Partial match */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) EXPORT_SYMBOL(ax25cmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)  *	Compare two AX.25 digipeater paths.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) int ax25digicmp(const ax25_digi *digi1, const ax25_digi *digi2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	if (digi1->ndigi != digi2->ndigi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	if (digi1->lastrepeat != digi2->lastrepeat)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	for (i = 0; i < digi1->ndigi; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		if (ax25cmp(&digi1->calls[i], &digi2->calls[i]) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 			return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)  *	Given an AX.25 address pull of to, from, digi list, command/response and the start of data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) const unsigned char *ax25_addr_parse(const unsigned char *buf, int len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	ax25_address *src, ax25_address *dest, ax25_digi *digi, int *flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	int *dama)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	int d = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	if (len < 14) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	if (flags != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		*flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		if (buf[6] & AX25_CBIT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 			*flags = AX25_COMMAND;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		if (buf[13] & AX25_CBIT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 			*flags = AX25_RESPONSE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	if (dama != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		*dama = ~buf[13] & AX25_DAMA_FLAG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	/* Copy to, from */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	if (dest != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		memcpy(dest, buf + 0, AX25_ADDR_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	if (src != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		memcpy(src,  buf + 7, AX25_ADDR_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	buf += 2 * AX25_ADDR_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	len -= 2 * AX25_ADDR_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	digi->lastrepeat = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	digi->ndigi      = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	while (!(buf[-1] & AX25_EBIT)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		if (d >= AX25_MAX_DIGIS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 			return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		if (len < AX25_ADDR_LEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 			return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		memcpy(&digi->calls[d], buf, AX25_ADDR_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		digi->ndigi = d + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		if (buf[6] & AX25_HBIT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 			digi->repeated[d] = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 			digi->lastrepeat  = d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 			digi->repeated[d] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		buf += AX25_ADDR_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		len -= AX25_ADDR_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		d++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	return buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)  *	Assemble an AX.25 header from the bits
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) int ax25_addr_build(unsigned char *buf, const ax25_address *src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	const ax25_address *dest, const ax25_digi *d, int flag, int modulus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	int len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	int ct  = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	memcpy(buf, dest, AX25_ADDR_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	buf[6] &= ~(AX25_EBIT | AX25_CBIT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	buf[6] |= AX25_SSSID_SPARE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	if (flag == AX25_COMMAND) buf[6] |= AX25_CBIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	buf += AX25_ADDR_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	len += AX25_ADDR_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	memcpy(buf, src, AX25_ADDR_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	buf[6] &= ~(AX25_EBIT | AX25_CBIT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	buf[6] &= ~AX25_SSSID_SPARE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	if (modulus == AX25_MODULUS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		buf[6] |= AX25_SSSID_SPARE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		buf[6] |= AX25_ESSID_SPARE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	if (flag == AX25_RESPONSE) buf[6] |= AX25_CBIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	 *	Fast path the normal digiless path
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	if (d == NULL || d->ndigi == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		buf[6] |= AX25_EBIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		return 2 * AX25_ADDR_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	buf += AX25_ADDR_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	len += AX25_ADDR_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	while (ct < d->ndigi) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		memcpy(buf, &d->calls[ct], AX25_ADDR_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		if (d->repeated[ct])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 			buf[6] |= AX25_HBIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 			buf[6] &= ~AX25_HBIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		buf[6] &= ~AX25_EBIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		buf[6] |= AX25_SSSID_SPARE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		buf += AX25_ADDR_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		len += AX25_ADDR_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		ct++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	buf[-1] |= AX25_EBIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) int ax25_addr_size(const ax25_digi *dp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	if (dp == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		return 2 * AX25_ADDR_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	return AX25_ADDR_LEN * (2 + dp->ndigi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)  *	Reverse Digipeat List. May not pass both parameters as same struct
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) void ax25_digi_invert(const ax25_digi *in, ax25_digi *out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	int ct;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	out->ndigi      = in->ndigi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	out->lastrepeat = in->ndigi - in->lastrepeat - 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	/* Invert the digipeaters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	for (ct = 0; ct < in->ndigi; ct++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 		out->calls[ct] = in->calls[in->ndigi - ct - 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 		if (ct <= out->lastrepeat) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 			out->calls[ct].ax25_call[6] |= AX25_HBIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 			out->repeated[ct]            = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 			out->calls[ct].ax25_call[6] &= ~AX25_HBIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 			out->repeated[ct]            = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) }