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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
**************************************************************************/
#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
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Component */
/** */
/** Internet Protocol version 6 Prefix Table (IPv6 prefix table) */
/** */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_ipv6_prefix_list_delete_entry PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function deletes an entry from the prefix list. */
/* */
/* */
/* INPUT */
/* */
/* ip_ptr Pointer to IP control block */
/* entry Entry to be deleted */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* CHECK_IPV6_ADDRESS_SAME Compare two IPv6 addresses */
/* SET_SOLICITED_NODE_MULTICAST_ADDRESS Get the solicited-node */
/* multicast address */
/* _nx_ipv6_multicast_leave Leave an IPv6 mulcast group */
/* [ipv6_address_change_notify] User callback function */
/* */
/* CALLED BY */
/* */
/* _nx_ipv6_prefix_list_delete Delete a prefix entry. */
/* _nx_ipv6_prefix_router_timer_tick Router list timeout */
/* */
/* NOTE */
/* */
/* This function cannot be called from ISR. */
/* */
/**************************************************************************/
VOID _nx_ipv6_prefix_list_delete_entry(NX_IP *ip_ptr, NX_IPV6_PREFIX_ENTRY *entry)
{
UINT i;
ULONG address_prefix[4];
NXD_IPV6_ADDRESS *interface_ipv6_address_prev, *interface_ipv6_address;
ULONG multicast_address[4];
#ifdef NX_ENABLE_IPV6_ADDRESS_CHANGE_NOTIFY
UINT ipv6_addr_index;
#endif /* NX_ENABLE_IPV6_ADDRESS_CHANGE_NOTIFY */
/* Invalidate the interface IP address if we obtained the
interface IP address based on the prefix information. */
/* Search through each physical interface for a match. */
for (i = 0; i < NX_MAX_PHYSICAL_INTERFACES; i++)
{
/* Get a pointer to the first address in the interface list. */
interface_ipv6_address = ip_ptr -> nx_ip_interface[i].nxd_interface_ipv6_address_list_head;
interface_ipv6_address_prev = NX_NULL;
/* Search the address list for a match. */
while (interface_ipv6_address)
{
/* Is this interface address valid? */
if (interface_ipv6_address -> nxd_ipv6_address_state != NX_IPV6_ADDR_STATE_UNKNOWN &&
interface_ipv6_address -> nxd_ipv6_address_ConfigurationMethod == NX_IPV6_ADDRESS_BASED_ON_INTERFACE)
{
/* Yes. Extract the prefix to match on. The prefix length is 64 bits. */
address_prefix[0] = interface_ipv6_address -> nxd_ipv6_address[0];
address_prefix[1] = interface_ipv6_address -> nxd_ipv6_address[1];
address_prefix[2] = 0;
address_prefix[3] = 0;
/* Do we have a match? */
if (CHECK_IPV6_ADDRESSES_SAME(address_prefix, entry -> nx_ipv6_prefix_entry_network_address))
{
/* Yes, invalidate this address. */
interface_ipv6_address -> nxd_ipv6_address_valid = NX_FALSE;
interface_ipv6_address -> nxd_ipv6_address_state = NX_IPV6_ADDR_STATE_UNKNOWN;
interface_ipv6_address -> nxd_ipv6_address_ConfigurationMethod = NX_IPV6_ADDRESS_NOT_CONFIGURED;
#ifndef NX_DISABLE_IPV6_DAD
interface_ipv6_address -> nxd_ipv6_address_DupAddrDetectTransmit = 0;
#endif /* NX_DISABLE_IPV6_DAD */
/* Update the list. */
if (interface_ipv6_address_prev == NX_NULL)
{
ip_ptr -> nx_ip_interface[i].nxd_interface_ipv6_address_list_head = interface_ipv6_address -> nxd_ipv6_address_next;
}
else
{
interface_ipv6_address_prev -> nxd_ipv6_address_next = interface_ipv6_address -> nxd_ipv6_address_next;
}
/* Delete the associated multicast address. */
SET_SOLICITED_NODE_MULTICAST_ADDRESS(multicast_address, interface_ipv6_address -> nxd_ipv6_address);
_nx_ipv6_multicast_leave(ip_ptr, &multicast_address[0], interface_ipv6_address -> nxd_ipv6_address_attached);
#ifdef NX_ENABLE_IPV6_ADDRESS_CHANGE_NOTIFY
/* If the address change notify callback is set, invoke the callback function. */
if (ip_ptr -> nx_ipv6_address_change_notify)
{
ipv6_addr_index = (ULONG)interface_ipv6_address -> nxd_ipv6_address_index;
ip_ptr -> nx_ipv6_address_change_notify(ip_ptr, NX_IPV6_ADDRESS_LIFETIME_EXPIRED, i, ipv6_addr_index,
&interface_ipv6_address -> nxd_ipv6_address[0]);
}
#endif /* NX_ENABLE_IPV6_ADDRESS_CHANGE_NOTIFY */
/* Clear the address at last. */
SET_UNSPECIFIED_ADDRESS(interface_ipv6_address -> nxd_ipv6_address);
/* Address for this interface is found. Just break. */
break;
}
}
/* Set the previous address. */
interface_ipv6_address_prev = interface_ipv6_address;
/* Get the next address. */
interface_ipv6_address = interface_ipv6_address -> nxd_ipv6_address_next;
} /* while (interface_ipv6_address) */
} /* for(i = 0; i < NX_MAX_PHYSICAL_INTERFACES; i++) */
/* Unlink the previous node, if it exists. */
if (entry -> nx_ipv6_prefix_entry_prev == NX_NULL)
{
ip_ptr -> nx_ipv6_prefix_list_ptr = entry -> nx_ipv6_prefix_entry_next;
}
else
{
entry -> nx_ipv6_prefix_entry_prev -> nx_ipv6_prefix_entry_next = entry -> nx_ipv6_prefix_entry_next;
}
/* Unlink the next node if it exists. */
if (entry -> nx_ipv6_prefix_entry_next)
{
entry -> nx_ipv6_prefix_entry_next -> nx_ipv6_prefix_entry_prev = entry -> nx_ipv6_prefix_entry_prev;
}
/* Clean up this entry. */
entry -> nx_ipv6_prefix_entry_next = NX_NULL;
entry -> nx_ipv6_prefix_entry_prev = NX_NULL;
/* Put entry onto the free list.*/
if (ip_ptr -> nx_ipv6_prefix_entry_free_list == NX_NULL)
{
/* Free list is empty. Set entry to be the first on the list. */
ip_ptr -> nx_ipv6_prefix_entry_free_list = entry;
}
else
{
/* Free list is not empty. Insert the entry to the head of the list. */
ip_ptr -> nx_ipv6_prefix_entry_free_list -> nx_ipv6_prefix_entry_prev = entry;
entry -> nx_ipv6_prefix_entry_next = ip_ptr -> nx_ipv6_prefix_entry_free_list;
ip_ptr -> nx_ipv6_prefix_entry_free_list = entry;
}
/* All done. Return. */
return;
}
#endif /* FEATURE_NX_IPV6 */
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