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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
#ifndef NX_DISABLE_ICMPV6_ROUTER_SOLICITATION
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nxd_ipv6_router_solicitation_check PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* At every time tick, this function decrement the router solicitation */
/* counter. When the counter reaches zero, the stack sends out */
/* router solicitation. */
/* */
/* INPUT */
/* */
/* ip_ptr IP instance pointer */
/* router_address The specific gateway address */
/* to search for. */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _nx_icmpv6_send_rs Send router solicitation packet*/
/* */
/* CALLED BY */
/* */
/* nx_ip_thread_entry Handle IP thread task events */
/* */
/* NOTE */
/* */
/* Caller must obtain nx_ip_protection mutex before calling this */
/* function. */
/* */
/* This function cannot be called from ISR. */
/* */
/**************************************************************************/
void _nxd_ipv6_router_solicitation_check(NX_IP *ip_ptr)
{
UINT i;
for (i = 0; i < NX_MAX_PHYSICAL_INTERFACES; i++)
{
if (ip_ptr -> nx_ip_interface[i].nx_interface_valid == NX_TRUE)
{
/* Check if max number of router solicitation messages have been sent. */
if (ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_count != 0)
{
/* Check on count down timer for sending out next router solicitation message. */
ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_timer--;
if (ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_timer == 0)
{
if (_nx_icmpv6_send_rs(ip_ptr, i) &&
(ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_count ==
ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_max))
{
/* Initial RS is not sent successfully. */
/* Try it next round. */
ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_timer = 1;
}
else
{
ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_count--;
ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_timer = ip_ptr -> nx_ip_interface[i].nx_ipv6_rtr_solicitation_interval;
}
}
}
}
}
}
#endif /* NX_DISABLE_ICMPV6_ROUTER_SOLICITATION */
#endif /* FEATURE_NX_IPV6 */
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