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/*
* Embedded Linux library
* Copyright (C) 2018 Intel Corporation
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#ifndef __ELL_NET_H
#define __ELL_NET_H
#include <stdbool.h>
#include <stdint.h>
#include <string.h>
struct in_addr;
struct in6_addr;
#ifdef __cplusplus
extern "C" {
#endif
bool l_net_get_mac_address(uint32_t ifindex, uint8_t *out_addr);
char *l_net_get_name(uint32_t ifindex);
bool l_net_hostname_is_root(const char *hostname);
bool l_net_hostname_is_localhost(const char *hostname);
bool l_net_get_address(int ifindex, struct in_addr *out);
bool l_net_get_link_local_address(int ifindex, struct in6_addr *out);
static inline bool l_net_prefix_matches(const void *a, const void *b,
uint8_t prefix_len)
{
uint8_t bytes = prefix_len / 8;
uint8_t bits = prefix_len & 7;
uint8_t left = ((const uint8_t *) a)[bytes];
uint8_t right = ((const uint8_t *) b)[bytes];
/*
* @a and @b are network byte order IPv4 or IPv6 addresses.
* We want to check if the initial (top) @prefix_len bits match.
* memcmp the whole bytes, then compare the final byte's top
* bits by anding with a mask.
*/
if (memcmp(a, b, bytes))
return false;
return !bits || ((left ^ right) & (0xff00u >> bits)) == 0;
}
#ifdef __cplusplus
}
#endif
#endif /* __ELL_NET_H */
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