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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 Protocol (IP) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_arp.h"
#ifndef NX_DISABLE_IPV4
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_arp_interface_entries_delete PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function removes ARP entries associated with the interface */
/* specified by index from the IP's arp table. */
/* */
/* INPUT */
/* */
/* ip_ptr Pointer to IP control block */
/* index IP interface index */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* tx_mutex_get Obtain protection mutex */
/* _nx_arp_dynamic_entry_delete Delete dynamic ARP entry */
/* _nx_arp_static_entry_delete_internal Internal static ARP entry */
/* delete function */
/* tx_mutex_put release protection mutex */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/* 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 */
/* */
/**************************************************************************/
UINT _nx_arp_interface_entries_delete(NX_IP *ip_ptr, UINT index)
{
NX_ARP *arp_entry;
NX_ARP *next_arp_entry;
NX_ARP *last_arp_entry;
NX_INTERFACE *interface_ptr;
interface_ptr = &(ip_ptr -> nx_ip_interface[index]);
/* Obtain protection on this IP instance for access into the ARP dynamic list. */
tx_mutex_get(&(ip_ptr -> nx_ip_protection), TX_WAIT_FOREVER);
/* Begain remove ARP entries from the dynamic list. */
/* Setup pointers to the starting and ending ARP entries in the dynamic list. */
arp_entry = ip_ptr -> nx_ip_arp_dynamic_list;
/* Walk through the dynamic ARP list until there are no more active entries. */
while ((arp_entry) && (ip_ptr -> nx_ip_arp_dynamic_active_count))
{
/* Yes, there is one or more dynamic entries. */
/* Determine if this ARP entry is for the specified interface. */
if (arp_entry -> nx_arp_ip_interface == interface_ptr)
{
_nx_arp_dynamic_entry_delete(ip_ptr, arp_entry);
/* Cleanup the nx_arp_ip_interface filed. */
arp_entry -> nx_arp_ip_interface = NX_NULL;
}
/* Determine if we are at the end of the dynamic list. */
if (arp_entry -> nx_arp_pool_next != ip_ptr -> nx_ip_arp_dynamic_list)
{
/* No, simply move to the next dynamic entry. */
arp_entry = arp_entry -> nx_arp_pool_next;
}
else
{
/* Yes, we are at the end of the dynamic list, break out of the loop. */
break;
}
}
/* End remove ARP entries from the dynamic list. */
/* Begain remove ARP entries from the static list. */
/* Setup pointers to the starting/ending ARP entry in the static list. */
next_arp_entry = ip_ptr -> nx_ip_arp_static_list;
if (next_arp_entry)
{
/* Pick up the last ARP entry. */
last_arp_entry = next_arp_entry -> nx_arp_pool_previous;
/* Walk through the static ARP list until there are no more active entries. */
while (next_arp_entry)
{
/* Yes, there is one or more static ARP entries. */
arp_entry = next_arp_entry;
/* Move to the next pakcet in the queue. */
next_arp_entry = next_arp_entry -> nx_arp_pool_next;
if (arp_entry -> nx_arp_ip_interface == interface_ptr)
{
/* 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);
}
if (arp_entry == last_arp_entry)
{
break;
}
}
}
/* End remove ARP entries from the static list. */
/* Release the mutex. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return successful status to the caller. */
return(NX_SUCCESS);
}
#endif /* !NX_DISABLE_IPV4 */