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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 */
/** */
/** Internet Protocol version 6 Default Router Table (IPv6 router) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_ipv6.h"
#include "nx_nd_cache.h"
#ifdef FEATURE_NX_IPV6
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nxd_ipv6_find_default_router_from_address PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function finds the specific IPv6 default router. */
/* */
/* INPUT */
/* */
/* ip_ptr IP instance pointer */
/* router_address The specific gateway address */
/* to search for. */
/* */
/* OUTPUT */
/* */
/* default router entry Pointer to the default router */
/* entry. */
/* CALLS */
/* */
/* tx_mutex_get Obtain IP protection mutex */
/* tx_mutex_put Release IP protection mutex */
/* */
/* CALLED BY */
/* */
/* _nxd_icmpv6_process_na */
/* */
/* NOTE */
/* */
/* This function acquires the nx_ipv6_protection mutex. */
/* Make sure the mutex is not locked before entering this function. */
/* */
/* This function cannot be called from ISR. */
/* */
/**************************************************************************/
NX_IPV6_DEFAULT_ROUTER_ENTRY *_nxd_ipv6_find_default_router_from_address(NX_IP *ip_ptr, ULONG *router_address)
{
INT i;
NX_IPV6_DEFAULT_ROUTER_ENTRY *rt_entry;
/* Get exclusive access to the IP task lock. */
tx_mutex_get(&(ip_ptr -> nx_ip_protection), TX_WAIT_FOREVER);
/* Start the search at the top of the list...*/
i = 0;
/* And go through the entire table or until a match is found. */
while (i < NX_IPV6_DEFAULT_ROUTER_TABLE_SIZE)
{
/* Local pointer to table entry. */
rt_entry = &ip_ptr -> nx_ipv6_default_router_table[i];
/* Does this slot contain a valid router? */
if (rt_entry -> nx_ipv6_default_router_entry_flag)
{
/* Yes, check if it matches the specified router address. */
if (CHECK_IPV6_ADDRESSES_SAME(router_address, rt_entry -> nx_ipv6_default_router_entry_router_address))
{
/* Yes it does, we can release the IP protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return the pointer to this router entry. */
return(rt_entry);
}
}
i++;
}
/* Release the lock. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return a null pointer indicating no matching router found. */
return(NX_NULL);
}
#endif /* FEATURE_NX_IPV6 */
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