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/*
* Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
*
* This file is subject to the terms and conditions of the GNU Lesser General
* Public License v2.1. See the file LICENSE in the top level directory for
* more details.
*/
/**
* @{
*
* @file
*
* @author Martine Lenders <mlenders@inf.fu-berlin.de>
*/
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "net/ipv6/addr.h"
#ifdef MODULE_FMT
#include "fmt.h"
#else
#include <stdio.h>
#endif
const ipv6_addr_t ipv6_addr_unspecified = IPV6_ADDR_UNSPECIFIED;
const ipv6_addr_t ipv6_addr_loopback = IPV6_ADDR_LOOPBACK;
const ipv6_addr_t ipv6_addr_link_local_prefix = IPV6_ADDR_LINK_LOCAL_PREFIX;
const ipv6_addr_t ipv6_addr_solicited_node_prefix = IPV6_ADDR_SOLICITED_NODE_PREFIX;
const ipv6_addr_t ipv6_addr_all_nodes_if_local = IPV6_ADDR_ALL_NODES_IF_LOCAL;
const ipv6_addr_t ipv6_addr_all_nodes_link_local = IPV6_ADDR_ALL_NODES_LINK_LOCAL;
const ipv6_addr_t ipv6_addr_all_routers_if_local = IPV6_ADDR_ALL_ROUTERS_IF_LOCAL;
const ipv6_addr_t ipv6_addr_all_routers_link_local = IPV6_ADDR_ALL_ROUTERS_LINK_LOCAL;
const ipv6_addr_t ipv6_addr_all_routers_site_local = IPV6_ADDR_ALL_ROUTERS_SITE_LOCAL;
bool ipv6_addr_equal(const ipv6_addr_t *a, const ipv6_addr_t *b)
{
return (a->u64[0].u64 == b->u64[0].u64) &&
(a->u64[1].u64 == b->u64[1].u64);
}
uint8_t ipv6_addr_match_prefix(const ipv6_addr_t *a, const ipv6_addr_t *b)
{
uint8_t prefix_len = 0;
if ((a == NULL) || (b == NULL)) {
return 0;
}
if (a == b) {
return 128;
}
for (int i = 0; i < 16; i++) {
/* if bytes are equal add 8 */
if (a->u8[i] == b->u8[i]) {
prefix_len += 8;
}
else {
uint8_t xor = (a->u8[i] ^ b->u8[i]);
/* while bits from byte equal add 1 */
for (int j = 0; j < 8; j++) {
if ((xor & 0x80) == 0) {
prefix_len++;
xor = xor << 1;
}
else {
break;
}
}
break;
}
}
return prefix_len;
}
void ipv6_addr_init_prefix(ipv6_addr_t *out, const ipv6_addr_t *prefix,
uint8_t bits)
{
uint8_t bytes;
if (bits > 128) {
bits = 128;
}
bytes = bits / 8;
memcpy(out, prefix, bytes);
if (bits % 8) {
uint8_t mask = 0xff << (8 - (bits - (bytes * 8)));
out->u8[bytes] &= ~mask;
out->u8[bytes] |= (prefix->u8[bytes] & mask);
}
}
void ipv6_addr_init_iid(ipv6_addr_t *out, const uint8_t *iid, uint8_t bits)
{
uint8_t unaligned_bits, bytes, pos;
if (bits > 128) {
bits = 128;
}
unaligned_bits = bits % 8;
bytes = bits / 8;
pos = (IPV6_ADDR_BIT_LEN / 8) - bytes;
if (unaligned_bits) {
uint8_t mask = 0xff << unaligned_bits;
out->u8[pos - 1] &= mask;
out->u8[pos - 1] |= (*iid & ~mask);
iid++;
}
memcpy(&(out->u8[pos]), iid, bytes);
}
int ipv6_addr_split(char *addr_str, char seperator, int _default)
{
char *sep = addr_str;
while(*++sep) {
if (*sep == seperator) {
*sep++ = '\0';
if (*sep) {
_default = atoi(sep);
}
break;
}
}
return _default;
}
void ipv6_addr_print(const ipv6_addr_t *addr)
{
assert(addr);
char addr_str[IPV6_ADDR_MAX_STR_LEN];
ipv6_addr_to_str(addr_str, addr, sizeof(addr_str));
#ifdef MODULE_FMT
print_str(addr_str);
#else
printf("%s", addr_str);
#endif
}
/**
* @}
*/
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