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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2025-present Eclipse ThreadX Contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Component */
/** */
/** Neighbor Discovery Cache */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_nd_cache.h"
#ifdef FEATURE_NX_IPV6
#include "nx_ipv6.h"
#endif /* FEATURE_NX_IPV6 */
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nxd_nd_cache_hardware_address_find PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function finds the hardware address in the neighbor discovery */
/* (ND) cache table mapped to the input IP address. */
/* address. */
/* */
/* INPUT */
/* */
/* ip_ptr IP instance pointer */
/* ip_address Pointer to the IP address to */
/* search for */
/* physical_msw Physical address, most */
/* signifcant word */
/* physical_lsw Physical address, least */
/* signifcant word */
/* interface_index Pointer to interface through */
/* which the neighbor can be */
/* reached. */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* tx_mutex_get Obtain protection mutex */
/* tx_mutex_put Release protection mutex */
/* _nx_nd_cache_find_entry Find entry by IP address. */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/**************************************************************************/
UINT _nxd_nd_cache_hardware_address_find(NX_IP *ip_ptr,
NXD_ADDRESS *ip_address,
ULONG *physical_msw,
ULONG *physical_lsw,
UINT *interface_index)
{
#ifdef FEATURE_NX_IPV6
ND_CACHE_ENTRY *entry;
/* Obtain the protection. */
tx_mutex_get(&ip_ptr -> nx_ip_protection, TX_WAIT_FOREVER);
/* Find ND cache entry for a given IP address. */
if (_nx_nd_cache_find_entry(ip_ptr, ip_address -> nxd_ip_address.v6, &entry))
{
/* Release the protection. */
tx_mutex_put(&ip_ptr -> nx_ip_protection);
/* Not found */
return(NX_ENTRY_NOT_FOUND);
}
/* Construct the MAC address. */
/*lint -e{644} suppress variable might not be initialized, since "entry" was initialized when the return value of _nx_nd_cache_find_entry is NX_SUCCESS. */
*physical_msw = ((ULONG)entry -> nx_nd_cache_mac_addr[0]) << 8 | (ULONG)entry -> nx_nd_cache_mac_addr[1];
*physical_lsw = ((ULONG)entry -> nx_nd_cache_mac_addr[2]) << 24 | ((ULONG)entry -> nx_nd_cache_mac_addr[3]) << 16 |
((ULONG)entry -> nx_nd_cache_mac_addr[4]) << 8 | (ULONG)entry -> nx_nd_cache_mac_addr[5];
/* Get the interface_index. */
*interface_index = (entry -> nx_nd_cache_interface_ptr -> nx_interface_index);
/* Release the protection. */
tx_mutex_put(&ip_ptr -> nx_ip_protection);
return(NX_SUCCESS);
#else /* !FEATURE_NX_IPV6 */
NX_PARAMETER_NOT_USED(ip_ptr);
NX_PARAMETER_NOT_USED(ip_address);
NX_PARAMETER_NOT_USED(physical_msw);
NX_PARAMETER_NOT_USED(physical_lsw);
NX_PARAMETER_NOT_USED(interface_index);
return(NX_NOT_SUPPORTED);
#endif /* FEATURE_NX_IPV6 */
}
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