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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 Control Message Protocol (ICMP) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_ipv6.h"
#include "nx_icmpv6.h"
#ifdef FEATURE_NX_IPV6
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_icmpv6_destination_table_periodic_update PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is called from the IP thread task, and updates the */
/* MTU fields in the destination table, including handling MTU timer */
/* expiration and initiating a new path MTU probe. */
/* */
/* INPUT */
/* */
/* ip_ptr IP instance pointer */
/* */
/* OUTPUT */
/* */
/* NX_SUCCESS Search successfully completed */
/* regardless if match found or */
/* empty slot found for new entry*/
/* NX_NOT_SUCCESSFUL Invalid input, search aborted */
/* */
/* CALLS */
/* */
/* _nx_ipv6_perform_min_path_MTU_discovery */
/* Service to query the existing */
/* minimum path MTU for changes */
/* */
/* */
/* CALLED BY */
/* */
/* _nx_ip_thread_entry IP thread background task */
/* */
/**************************************************************************/
#ifdef NX_ENABLE_IPV6_PATH_MTU_DISCOVERY
VOID _nx_icmpv6_destination_table_periodic_update(NX_IP *ip_ptr)
{
UINT i, table_size;
/* Set a local variable for convenience. */
table_size = ip_ptr -> nx_ipv6_destination_table_size;
for (i = 0; table_size && (i < NX_IPV6_DESTINATION_TABLE_SIZE); i++)
{
/* Ignore entries whose path MTU is already at the host MTU. */
if (ip_ptr -> nx_ipv6_destination_table[i].nx_ipv6_destination_entry_path_mtu &&
ip_ptr -> nx_ipv6_destination_table[i].nx_ipv6_destination_entry_nd_entry &&
(ip_ptr -> nx_ipv6_destination_table[i].nx_ipv6_destination_entry_path_mtu ==
ip_ptr -> nx_ipv6_destination_table[i].nx_ipv6_destination_entry_nd_entry -> nx_nd_cache_interface_ptr -> nx_interface_ip_mtu_size))
{
continue;
}
/* Check for valid entries with a non infinite path MTU timeout. */
if (ip_ptr -> nx_ipv6_destination_table[i].nx_ipv6_destination_entry_valid &&
(ip_ptr -> nx_ipv6_destination_table[i].nx_ipv6_destination_entry_MTU_timer_tick != NX_WAIT_FOREVER))
{
/* Keep track of valid entries we have checked. */
table_size--;
/* Decrement the timer on table entry. */
if (ip_ptr -> nx_ipv6_destination_table[i].nx_ipv6_destination_entry_MTU_timer_tick <= NX_IP_PERIODIC_RATE)
{
/* Reset the path MTU to the IP instance MTU. */
ip_ptr -> nx_ipv6_destination_table[i].nx_ipv6_destination_entry_path_mtu =
ip_ptr -> nx_ipv6_destination_table[i].nx_ipv6_destination_entry_nd_entry -> nx_nd_cache_interface_ptr -> nx_interface_ip_mtu_size;
/* This is our optimal path MTU. So there is no need to age this table entry
and attempt to increase the path MTU; ok set it to infinity. */
ip_ptr -> nx_ipv6_destination_table[i].nx_ipv6_destination_entry_MTU_timer_tick = NX_WAIT_FOREVER;
}
else
{
ip_ptr -> nx_ipv6_destination_table[i].nx_ipv6_destination_entry_MTU_timer_tick -= (ULONG)NX_IP_PERIODIC_RATE;
}
}
}
return;
}
#endif /* NX_ENABLE_IPV6_PATH_MTU_DISCOVERY */
#endif /* FEATURE_NX_IPV6 */
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