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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 */
/** */
/** Address Resolution Protocol (ARP) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_arp.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_arp_static_entry_delete PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function removes a previously setup static IP to hardware */
/* mapping and returns the associated ARP entry back to the dynamic */
/* ARP pool. */
/* */
/* INPUT */
/* */
/* ip_ptr IP instance pointer */
/* ip_address IP Address binding to delete */
/* physical_msw Physical address MSW */
/* physical_lsw Physical address LSW */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* tx_mutex_get Obtain protection mutex */
/* _nx_arp_static_entry_delete_internal Internal ARP entry delete */
/* tx_mutex_put Release protection mutex */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* _nx_arp_static_entries_delete Delete all static entries */
/* */
/**************************************************************************/
UINT _nx_arp_static_entry_delete(NX_IP *ip_ptr, ULONG ip_address,
ULONG physical_msw, ULONG physical_lsw)
{
#ifndef NX_DISABLE_IPV4
NX_ARP *arp_entry;
UINT status;
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_ARP_STATIC_ENTRY_DELETE, ip_ptr, ip_address, physical_msw, physical_lsw, NX_TRACE_ARP_EVENTS, 0, 0);
/* Obtain protection on this IP instance for access into the ARP static
list. */
tx_mutex_get(&(ip_ptr -> nx_ip_protection), TX_WAIT_FOREVER);
/* Search the static list for a matching IP and hardware mapping. */
arp_entry = ip_ptr -> nx_ip_arp_static_list;
while (arp_entry)
{
/* Determine if we have a match. */
if ((arp_entry -> nx_arp_ip_address == ip_address) &&
(arp_entry -> nx_arp_physical_address_msw == physical_msw) &&
(arp_entry -> nx_arp_physical_address_lsw == physical_lsw))
{
/* Yes, we have found the ARP entry we are looking for. */
break;
}
else
{
/* Determine if we are at the end of the list. */
if (arp_entry -> nx_arp_pool_next == ip_ptr -> nx_ip_arp_static_list)
{
/* Set the arp_entry to NULL to signify nothing was found and get
out of the search loop. */
arp_entry = NX_NULL;
break;
}
else
{
/* Just move to the next ARP entry on the static list. */
arp_entry = arp_entry -> nx_arp_pool_next;
}
}
}
/* At this point the ARP entry pointer determines whether or not anything was found
on the static list. */
if (arp_entry)
{
/* The static entry was found. It needs to be unlinked from the active
list and the static list and re-linked to the end of the dynamic list. */
_nx_arp_static_entry_delete_internal(ip_ptr, arp_entry);
/* Setup the return status. */
status = NX_SUCCESS;
}
else
{
/* Indicate the entry was not found. */
status = NX_ENTRY_NOT_FOUND;
}
/* Release the protection on the ARP list. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return status to the caller. */
return(status);
#else /* NX_DISABLE_IPV4 */
NX_PARAMETER_NOT_USED(ip_ptr);
NX_PARAMETER_NOT_USED(ip_address);
NX_PARAMETER_NOT_USED(physical_msw);
NX_PARAMETER_NOT_USED(physical_lsw);
return(NX_NOT_SUPPORTED);
#endif /* !NX_DISABLE_IPV4 */
}
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