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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"
#include "nx_icmpv6.h"
#ifdef FEATURE_NX_IPV6
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nxd_ipv6_prefix_router_timer_tick PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* At every time tick, this function checks for time out expiration on */
/* both the default router list and the prefix list tables bound to the*/
/* supplied IP instance. */
/* */
/* INPUT */
/* */
/* ip_ptr IP instance pointer */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _nx_invalidate_destination_entry Invalidate the entry in the */
/* destination */
/* */
/* CALLED BY */
/* */
/* _nx_ip_thread_entry */
/* */
/* NOTE */
/* */
/* The nx_ip_protection mutex must be obtained before calling this */
/* function. */
/* */
/* This function cannot be called from ISR. */
/* */
/**************************************************************************/
VOID _nxd_ipv6_prefix_router_timer_tick(NX_IP *ip_ptr)
{
UINT i, table_size;
NX_IPV6_PREFIX_ENTRY *tmp, *prefix_entry;
NX_IPV6_DEFAULT_ROUTER_ENTRY *rt_entry;
/* Set a local variable for convenience. */
table_size = ip_ptr -> nx_ipv6_default_router_table_size;
/* Check each entry in the default router table. */
for (i = 0; table_size && (i < NX_IPV6_DEFAULT_ROUTER_TABLE_SIZE); i++)
{
/* Set a local variable for convenience. */
rt_entry = &ip_ptr -> nx_ipv6_default_router_table[i];
/* Skip invalid or empty slots. */
if ((rt_entry -> nx_ipv6_default_router_entry_flag & NX_IPV6_ROUTE_TYPE_VALID) == 0)
{
continue;
}
/* Keep track of valid entries we've checked. */
table_size--;
/* Has the entry on the current table entry expired? */
if (rt_entry -> nx_ipv6_default_router_entry_life_time == 0)
{
/* Yes, the router has timed out. */
/* Does this router have an entry in the ND cache table? */
if (rt_entry -> nx_ipv6_default_router_entry_neighbor_cache_ptr)
{
/* Yes, clear out that entry, we are invalidating this entry. */
rt_entry -> nx_ipv6_default_router_entry_neighbor_cache_ptr -> nx_nd_cache_is_router = NX_NULL;
}
/* Clean any entries in the destination table for this router. */
_nx_invalidate_destination_entry(ip_ptr, rt_entry -> nx_ipv6_default_router_entry_router_address);
/* Invalidate the entry in the router table. */
rt_entry -> nx_ipv6_default_router_entry_flag = 0;
/* Clear the interface pointer .*/
rt_entry -> nx_ipv6_default_router_entry_interface_ptr = NX_NULL;
/* Decrease the IP instance default router count. */
ip_ptr -> nx_ipv6_default_router_table_size--;
}
else
{
/* Is this a static router (infinite timeout)? */
if (rt_entry -> nx_ipv6_default_router_entry_life_time != 0xFFFF)
{
/* No, so decrement the lifetime by one tick.*/
rt_entry -> nx_ipv6_default_router_entry_life_time--;
}
}
}
/* Set a pointer to the first prefix entry in the IP prefix list. */
prefix_entry = ip_ptr -> nx_ipv6_prefix_list_ptr;
/* Loop through the entire list. */
while (prefix_entry)
{
/* Set a placemarker at the current prefix. */
tmp = prefix_entry;
/* Get a pointer to the next prefix. */
prefix_entry = prefix_entry -> nx_ipv6_prefix_entry_next;
/* Skip the static entries. */
if (tmp -> nx_ipv6_prefix_entry_valid_lifetime != (UINT)0xFFFFFFFF)
{
/* Has the prefix entry timeout expired? */
if (tmp -> nx_ipv6_prefix_entry_valid_lifetime == 0)
{
/* Yes, so delete it from the list. */
_nx_ipv6_prefix_list_delete_entry(ip_ptr, tmp);
}
else
{
/* Just decrement the time remaining. */
tmp -> nx_ipv6_prefix_entry_valid_lifetime--;
}
}
}
return;
}
#endif /* FEATURE_NX_IPV6 */
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