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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"
#include "nx_packet.h"
#ifndef NX_DISABLE_IPV4
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_arp_dynamic_entry_delete PORTABLE C */
/* 6.4.3 */
/* 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 of APR table */
/* arp_ptr ARP entry to delete */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_packet_transmit_release Release the transmitted packet*/
/* */
/* CALLED BY */
/* */
/* Internal */
/* */
/**************************************************************************/
UINT _nx_arp_dynamic_entry_delete(NX_IP *ip_ptr, NX_ARP *arp_ptr)
{
TX_INTERRUPT_SAVE_AREA
NX_PACKET *packet_ptr, *next_packet_ptr;
/* Determine if this ARP entry is already active. */
if (arp_ptr -> nx_arp_active_list_head)
{
/* Remove this dynamic ARP entry from the associated list. */
/* Disable interrupts. */
TX_DISABLE
/* Determine if this is the only ARP entry on the list. */
if (arp_ptr == arp_ptr -> nx_arp_active_next)
{
/* Remove the entry from the list. */
*(arp_ptr -> 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_ptr -> nx_arp_active_list_head) == arp_ptr)
{
*(arp_ptr -> nx_arp_active_list_head) = arp_ptr -> nx_arp_active_next;
}
/* Update the links of the adjacent ARP entries. */
(arp_ptr -> nx_arp_active_next) -> nx_arp_active_previous = arp_ptr -> nx_arp_active_previous;
(arp_ptr -> nx_arp_active_previous) -> nx_arp_active_next = arp_ptr -> nx_arp_active_next;
}
/* No longer active, clear the active list head. */
arp_ptr -> nx_arp_active_list_head = NX_NULL;
/* Decrease the number of active ARP entries. */
ip_ptr -> nx_ip_arp_dynamic_active_count--;
/* Pickup the queued packets head pointer. */
next_packet_ptr = arp_ptr -> nx_arp_packets_waiting;
/* Clear the queued packets head pointer. */
arp_ptr -> nx_arp_packets_waiting = NX_NULL;
/* Restore interrupts. */
TX_RESTORE
/* Loop to remove all queued packets. */
while (next_packet_ptr)
{
/* Pickup the packet pointer at the head of the queue. */
packet_ptr = next_packet_ptr;
/* Move to the next packet in the queue. */
next_packet_ptr = next_packet_ptr -> nx_packet_queue_next;
/* Clear the next packet queue pointer. */
packet_ptr -> nx_packet_queue_next = NX_NULL;
#ifndef NX_DISABLE_IP_INFO
/* Increment the IP send packets dropped count. */
ip_ptr -> nx_ip_send_packets_dropped++;
#endif
/* Release the packet that was queued from the previous ARP entry. */
_nx_packet_transmit_release(packet_ptr);
}
}
return(NX_SUCCESS);
}
#endif /* !NX_DISABLE_IPV4 */
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