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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 */
/** */
/** Address Resolution Protocol (ARP) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_arp.h"
#ifndef NX_DISABLE_IPV4
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_arp_static_entry_delete_internal PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function deletes the ARP entry pointed to by the caller. Note */
/* the caller should already have searched the ARP list to verify a */
/* valid ARP entry to delete. Also, it is assumed the caller already */
/* has obtained the IP protection mutex before invoking this service. */
/* */
/* INPUT */
/* */
/* ip_ptr IP instance owner of APR table*/
/* arp_entry ARP entry to delete */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* _nx_arp_interface_entries_delete Delete ARP entry associated */
/* with the specified interface*/
/* _nx_arp_static_entry_delete Delete static ARP 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 */
/* */
/**************************************************************************/
VOID _nx_arp_static_entry_delete_internal(NX_IP *ip_ptr, NX_ARP *arp_entry)
{
TX_INTERRUPT_SAVE_AREA
#ifndef NX_DISABLE_ARP_INFO
/* Decrement the ARP static entry count. */
ip_ptr -> nx_ip_arp_static_entries--;
#endif
/* Disable interrupts temporarily. */
TX_DISABLE
/* Determine if this ARP entry is already active. */
if (arp_entry -> nx_arp_active_list_head)
{
/* Remove this dynamic ARP entry from the associated list. */
/* Determine if this is the only ARP entry on the list. */
if (arp_entry == arp_entry -> nx_arp_active_next)
{
/* Remove the entry from the list. */
*(arp_entry -> nx_arp_active_list_head) = NX_NULL;
}
else
{
/* Remove the entry from a list of more than one entry. */
/* Update the list head pointer. */
if (*(arp_entry -> nx_arp_active_list_head) == arp_entry)
{
*(arp_entry -> nx_arp_active_list_head) = arp_entry -> nx_arp_active_next;
}
/* Update the links of the adjacent ARP entries. */
(arp_entry -> nx_arp_active_next) -> nx_arp_active_previous =
arp_entry -> nx_arp_active_previous;
(arp_entry -> nx_arp_active_previous) -> nx_arp_active_next =
arp_entry -> nx_arp_active_next;
}
}
/* Remove this entry from the static ARP list. */
/* Determine if this is the only ARP entry on the static list. */
if (arp_entry == arp_entry -> nx_arp_pool_next)
{
/* Remove the sole entry from the static list head. */
ip_ptr -> nx_ip_arp_static_list = NX_NULL;
}
else
{
/* Remove the entry from a list of more than one entry. */
/* Update the links of the adjacent ARP dynamic pool entries. */
(arp_entry -> nx_arp_pool_next) -> nx_arp_pool_previous =
arp_entry -> nx_arp_pool_previous;
(arp_entry -> nx_arp_pool_previous) -> nx_arp_pool_next =
arp_entry -> nx_arp_pool_next;
/* Update the list head pointer. */
if (ip_ptr -> nx_ip_arp_static_list == arp_entry)
{
ip_ptr -> nx_ip_arp_static_list = arp_entry -> nx_arp_pool_next;
}
}
/* Clear the fields that indicate the ARP entry is a static entry and make sure
it is viewed as inactive in preparation for returning it to the dynamic ARP
pool. */
arp_entry -> nx_arp_route_static = NX_FALSE;
arp_entry -> nx_arp_active_list_head = NX_NULL;
/* Place the ARP entry at the end of the dynamic ARP pool, which is where new
ARP requests are allocated from. */
/* Determine if the dynamic ARP pool is empty. */
if (ip_ptr -> nx_ip_arp_dynamic_list)
{
/* Dynamic list is not empty, add former static ARP entry to the end of the list. */
arp_entry -> nx_arp_pool_next = ip_ptr -> nx_ip_arp_dynamic_list;
arp_entry -> nx_arp_pool_previous = (ip_ptr -> nx_ip_arp_dynamic_list) -> nx_arp_pool_previous;
((ip_ptr -> nx_ip_arp_dynamic_list) -> nx_arp_pool_previous) -> nx_arp_pool_next = arp_entry;
(ip_ptr -> nx_ip_arp_dynamic_list) -> nx_arp_pool_previous = arp_entry;
}
else
{
/* Dynamic list was empty, just place it at the head of the dynamic list. */
ip_ptr -> nx_ip_arp_dynamic_list = arp_entry;
arp_entry -> nx_arp_pool_next = arp_entry;
arp_entry -> nx_arp_pool_previous = arp_entry;
}
/* Restore interrupts. */
TX_RESTORE
}
#endif /* !NX_DISABLE_IPV4 */