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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_entry_allocate PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function allocates an ARP entry for a specific new IP */
/* destination. */
/* */
/* INPUT */
/* */
/* ip_ptr IP instance pointer */
/* arp_list_ptr List head of where to place */
/* the newly allocated ARP */
/* entry */
/* is_static Entry attribute static/dynamic*/
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_arp_dynamic_entry_delete Delete the dynamic entry */
/* */
/* CALLED BY */
/* */
/* NetX Source Code */
/* */
/* 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_entry_allocate(NX_IP *ip_ptr, NX_ARP **arp_list_ptr, UINT is_static)
{
TX_INTERRUPT_SAVE_AREA
NX_ARP *arp_entry;
UINT status;
/* Determine if there is an ARP entry available in the dynamic list. */
if (ip_ptr -> nx_ip_arp_dynamic_list)
{
/* Yes there are one or more free entries. */
/* Pickup pointer to last used dynamic ARP entry. */
arp_entry = (ip_ptr -> nx_ip_arp_dynamic_list) -> nx_arp_pool_previous;
/* Remove from the dynamic list. */
_nx_arp_dynamic_entry_delete(ip_ptr, arp_entry);
/* Disable interrupts temporarily. */
TX_DISABLE
/* Link the ARP entry at the head of the IP list. */
/* Determine if the ARP entry is being added to an empty list. */
if (*arp_list_ptr)
{
/* Add the ARP entry to the beginning of the nonempty ARP
list. */
arp_entry -> nx_arp_active_list_head = arp_list_ptr;
arp_entry -> nx_arp_active_next = *arp_list_ptr;
arp_entry -> nx_arp_active_previous = (*arp_list_ptr) -> nx_arp_active_previous;
(arp_entry -> nx_arp_active_previous) -> nx_arp_active_next = arp_entry;
(*arp_list_ptr) -> nx_arp_active_previous = arp_entry;
}
else
{
/* Empty list, just put the ARP entry at the beginning. */
arp_entry -> nx_arp_active_list_head = arp_list_ptr;
arp_entry -> nx_arp_active_next = arp_entry;
arp_entry -> nx_arp_active_previous = arp_entry;
/* Now setup the list head. */
*arp_list_ptr = arp_entry;
}
/* Determine if this is a static entry. */
if (is_static == NX_TRUE)
{
/* Remove this entry from the ARP dynamic list. */
/* Determine if this is the only ARP entry on the dynamic list. */
if (arp_entry == arp_entry -> nx_arp_pool_next)
{
/* Remove the sole entry from the dynamic list head. */
ip_ptr -> nx_ip_arp_dynamic_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;
}
/* Add the entry to the ARP static list. */
/* Determine if the ARP static list is empty. */
if (ip_ptr -> nx_ip_arp_static_list == NX_NULL)
{
/* Just place this single ARP entry on the list. */
arp_entry -> nx_arp_pool_next = arp_entry;
arp_entry -> nx_arp_pool_previous = arp_entry;
ip_ptr -> nx_ip_arp_static_list = arp_entry;
}
else
{
/* Add to the end of the ARP static list. */
arp_entry -> nx_arp_pool_next = ip_ptr -> nx_ip_arp_static_list;
arp_entry -> nx_arp_pool_previous = (ip_ptr -> nx_ip_arp_static_list) -> nx_arp_pool_previous;
((ip_ptr -> nx_ip_arp_static_list) -> nx_arp_pool_previous) -> nx_arp_pool_next = arp_entry;
(ip_ptr -> nx_ip_arp_static_list) -> nx_arp_pool_previous = arp_entry;
}
#ifndef NX_DISABLE_ARP_INFO
/* Increment the ARP static entry count. */
ip_ptr -> nx_ip_arp_static_entries++;
#endif
}
else /* Allocate entry from dynamic list. */
{
/* Move this ARP entry to the front of the general ARP dynamic entry pool. */
if (arp_entry != ip_ptr -> nx_ip_arp_dynamic_list)
{
/* The current ARP entry is not at the front of the list, so it
must be moved. */
/* Link up the neighbors first. */
(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;
/* Now link this ARP entry to the head of the list. */
arp_entry -> nx_arp_pool_next = ip_ptr -> nx_ip_arp_dynamic_list;
arp_entry -> nx_arp_pool_previous = (arp_entry -> nx_arp_pool_next) -> nx_arp_pool_previous;
(arp_entry -> nx_arp_pool_previous) -> nx_arp_pool_next = arp_entry;
(arp_entry -> nx_arp_pool_next) -> nx_arp_pool_previous = arp_entry;
/* Now set the list head to this ARP entry. */
ip_ptr -> nx_ip_arp_dynamic_list = arp_entry;
}
/* Increment the number of active dynamic entries. */
ip_ptr -> nx_ip_arp_dynamic_active_count++;
}
/* Set the entry type. */
arp_entry -> nx_arp_route_static = is_static;
/* Restore interrupts. */
TX_RESTORE
/* Setup a successful status return. */
status = NX_SUCCESS;
}
else
{
/* No more ARP entries are available, all the ARP entries must be
allocated on the static list. */
status = NX_NO_MORE_ENTRIES;
}
/* Return status to the caller. */
return(status);
}
#endif /* !NX_DISABLE_IPV4 */
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