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gnrc_ipv6_nc: introduce L2 address lookup function

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This commit is contained in:
Martine Lenders 2015-11-17 18:05:16 +01:00
parent 54e6163ab3
commit 7b21f95df5
2 changed files with 29 additions and 0 deletions
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17
sys/include/net/gnrc/ipv6/nc.h
View File

@ -21,8 +21,10 @@
#ifndef GNRC_IPV6_NC_H_
#define GNRC_IPV6_NC_H_
#include <assert.h>
#include <stdbool.h>
#include <stdint.h>
#include <string.h>
#include "kernel_types.h"
#include "net/eui64.h"
@ -293,6 +295,21 @@ static inline bool gnrc_ipv6_nc_is_reachable(const gnrc_ipv6_nc_t *entry)
*/
gnrc_ipv6_nc_t *gnrc_ipv6_nc_still_reachable(const ipv6_addr_t *ipv6_addr);
/**
* @brief Gets link-layer address from neighbor cache entry if neighbor is reachable.
*
* @pre (l2_addr != NULL) && (l2_addr_len != NULL)
*
* @param[out] l2_addr The link layer address of @p entry. Must not be NULL.
* @param[out] l2_addr_len Length of @p l2_addr. Must not be NULL.
* @param[in] entry A neighbor cache entry
*
* @return PID to the interface where the neighbor is.
* @return KERNEL_PID_UNDEF, if @p entry == NULL or the neighbor is not reachable.
*/
kernel_pid_t gnrc_ipv6_nc_get_l2_addr(uint8_t *l2_addr, uint8_t *l2_addr_len,
const gnrc_ipv6_nc_t *entry);
#ifdef __cplusplus
}
#endif

12
sys/net/gnrc/network_layer/ipv6/nc/gnrc_ipv6_nc.c
View File

@ -263,4 +263,16 @@ gnrc_ipv6_nc_t *gnrc_ipv6_nc_still_reachable(const ipv6_addr_t *ipv6_addr)
return entry;
}
kernel_pid_t gnrc_ipv6_nc_get_l2_addr(uint8_t *l2_addr, uint8_t *l2_addr_len,
const gnrc_ipv6_nc_t *entry)
{
assert((l2_addr != NULL) && (l2_addr_len != NULL));
if ((entry == NULL) || !gnrc_ipv6_nc_is_reachable(entry)) {
return KERNEL_PID_UNDEF;
}
*l2_addr_len = entry->l2_addr_len;
memcpy(l2_addr, entry->l2_addr, entry->l2_addr_len);
return entry->iface;
}
/** @} */