diff options
Diffstat (limited to 'net/ax25/ax25_addr.c')
| -rw-r--r-- | net/ax25/ax25_addr.c | 303 |
1 files changed, 0 insertions, 303 deletions
diff --git a/net/ax25/ax25_addr.c b/net/ax25/ax25_addr.c deleted file mode 100644 index f96c65586..000000000 --- a/net/ax25/ax25_addr.c +++ /dev/null @@ -1,303 +0,0 @@ -/* - * AX.25 release 037 - * - * This code REQUIRES 2.1.15 or higher/ NET3.038 - * - * This module: - * This module 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. - * - * Most of this code is based on the SDL diagrams published in the 7th - * ARRL Computer Networking Conference papers. The diagrams have mistakes - * in them, but are mostly correct. Before you modify the code could you - * read the SDL diagrams as the code is not obvious and probably very - * easy to break; - * - * History - * AX.25 036 Jonathan(G4KLX) Split from ax25_subr.c. - */ - -#include <linux/errno.h> -#include <linux/types.h> -#include <linux/socket.h> -#include <linux/in.h> -#include <linux/kernel.h> -#include <linux/sched.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 null address is defined as a callsign of all spaces with an - * SSID of zero. - */ -ax25_address null_ax25_address = {{0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x00}}; - -/* - * ax25 -> ascii conversion - */ -char *ax2asc(ax25_address *a) -{ - static char buf[11]; - 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; - -} - -/* - * ascii -> ax25 conversion - */ -ax25_address *asc2ax(char *callsign) -{ - static ax25_address addr; - 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; - } - - 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; - - return &addr; -} - -/* - * Compare two ax.25 addresses - */ -int ax25cmp(ax25_address *a, 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 */ -} - -/* - * Compare two AX.25 digipeater paths. - */ -int ax25digicmp(ax25_digi *digi1, 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 - * - */ -unsigned char *ax25_addr_parse(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, ax25_address *src, ax25_address *dest, 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(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(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; - } - } -} - |