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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** 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 NX_IPSEC_ENABLE
#include "nx_ipsec.h"
#endif /* NX_IPSEC_ENABLE */
#ifdef FEATURE_NX_IPV6
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_icmpv6_perform_DAD PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is called from IP thread periodic process routine. */
/* It starts the Duplicate Address Detection process if the interface */
/* address is in tentative state (not validated yet). It does nothing */
/* to an address if the state of the address is not tentative. */
/* */
/* INPUT */
/* */
/* ip_ptr Pointer to IP instance */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _nx_icmpv6_DAD_clear_NDCache_entry Remove entry from cache table */
/* _nx_icmpv6_send_ns Send a Neighbor Solicitation */
/* message */
/* [ipv6_address_change_notify] User callback fucntion */
/* */
/* CALLED BY */
/* */
/* _nx_ip_thraed_entry */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Yuxin Zhou Initial Version 6.0 */
/* 09-30-2020 Yuxin Zhou Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
#ifndef NX_DISABLE_IPV6_DAD
VOID _nx_icmpv6_perform_DAD(NX_IP *ip_ptr)
{
UINT i;
NXD_IPV6_ADDRESS *nx_ipv6_address_next;
#ifdef NX_ENABLE_IPV6_ADDRESS_CHANGE_NOTIFY
UINT ipv6_addr_index;
#endif /* NX_ENABLE_IPV6_ADDRESS_CHANGE_NOTIFY */
/* Go through all addresses bound to the IP instance. */
for (i = 0; i < NX_MAX_PHYSICAL_INTERFACES; i++)
{
/* Check if this interface valid. */
if (!ip_ptr -> nx_ip_interface[i].nxd_interface_ipv6_address_list_head)
{
continue;
}
/* Only interested in addresses in the tentative state. */
for (nx_ipv6_address_next = ip_ptr -> nx_ip_interface[i].nxd_interface_ipv6_address_list_head;
nx_ipv6_address_next;
nx_ipv6_address_next = nx_ipv6_address_next -> nxd_ipv6_address_next)
{
/* Check the address state. */
if (nx_ipv6_address_next -> nxd_ipv6_address_state == NX_IPV6_ADDR_STATE_TENTATIVE)
{
/* Check if the number of NS messages is used up. */
if (nx_ipv6_address_next -> nxd_ipv6_address_DupAddrDetectTransmit)
{
/* No. This interface is still under DAD. Transmit a NS */
_nx_icmpv6_send_ns(ip_ptr,
nx_ipv6_address_next -> nxd_ipv6_address,
0, nx_ipv6_address_next, 0, NX_NULL);
nx_ipv6_address_next -> nxd_ipv6_address_DupAddrDetectTransmit--;
}
else
{
/* So far we didn't get any conflict addresses back.
So promote the address to VALID */
nx_ipv6_address_next -> nxd_ipv6_address_state = NX_IPV6_ADDR_STATE_VALID;
_nx_icmpv6_DAD_clear_NDCache_entry(ip_ptr,
nx_ipv6_address_next -> nxd_ipv6_address);
#ifdef NX_ENABLE_IPV6_ADDRESS_CHANGE_NOTIFY
/* If the callback function is set, invoke the callback function . */
if (ip_ptr -> nx_ipv6_address_change_notify)
{
ipv6_addr_index = (ULONG)nx_ipv6_address_next -> nxd_ipv6_address_index;
ip_ptr -> nx_ipv6_address_change_notify(ip_ptr, NX_IPV6_ADDRESS_DAD_SUCCESSFUL,
i, ipv6_addr_index, &nx_ipv6_address_next -> nxd_ipv6_address[0]);
}
#endif /* NX_ENABLE_IPV6_ADDRESS_CHANGE_NOTIFY */
}
}
}
}
}
#endif /* NX_DISABLE_IPV6_DAD */
#endif /* FEATURE_NX_IPV6 */
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