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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_entry_ip_address_find PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function finds an IPv6 address in the neighbor discovery */
/* cache table based on user-speicified MAC address. */
/* */
/* INPUT */
/* */
/* ip_ptr Pointer to IP instance */
/* ip_address Pointer to the IP address */
/* to search for */
/* physical_msw Physical address, most */
/* significant word */
/* physical_lsw Physical address, least */
/* significant word */
/* interface_index Index to the network */
/* interface through which the */
/* node is reachable. */
/* */
/* OUTPUT */
/* */
/* Status Completion status */
/* */
/* CALLS */
/* */
/* _nx_nd_cache_find_entry_by_mac_addr Internal find IP address in */
/* ND cache table mapped to */
/* input by mac address. */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/**************************************************************************/
UINT _nxd_nd_cache_ip_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;
/* Find ND entry according to the given MAC address. */
/* Obtain the protection. */
tx_mutex_get(&ip_ptr -> nx_ip_protection, TX_WAIT_FOREVER);
if (_nx_nd_cache_find_entry_by_mac_addr(ip_ptr, physical_msw, physical_lsw, &entry) != NX_SUCCESS)
{
/* Release the protection. */
tx_mutex_put(&ip_ptr -> nx_ip_protection);
/* No such MAC address found in cache table. */
return(NX_ENTRY_NOT_FOUND);
}
/* Copy the IP address and version from the cache entry into the address structure. */
ip_address -> nxd_ip_version = NX_IP_VERSION_V6;
/*lint -e{644} suppress variable might not be initialized, since "entry" was initialized as long as previous call is NX_SUCCESS. */
COPY_IPV6_ADDRESS(entry -> nx_nd_cache_dest_ip, ip_address -> nxd_ip_address.v6);
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_ND_CACHE_IP_ADDRESS_FIND, ip_ptr, ip_address -> nxd_ip_address.v6[3], physical_msw, physical_lsw, NX_TRACE_ARP_EVENTS, 0, 0);
/* 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);
/* Successful completion*/
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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