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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 */
/** */
/** Reverse Address Resolution Protocol (RARP) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_rarp.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_rarp_enable PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function enables the RARP management component for the */
/* specified IP instance. For a multi-homed device, RARP is enabled */
/* on all attahced interfaces, as long as the interface IP address */
/* is not configured yet. */
/* */
/* INPUT */
/* */
/* ip_ptr IP instance pointer */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/**************************************************************************/
UINT _nx_rarp_enable(NX_IP *ip_ptr)
{
#ifndef NX_DISABLE_IPV4
TX_INTERRUPT_SAVE_AREA
UINT i, rarp_enable;
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_RARP_ENABLE, ip_ptr, 0, 0, 0, NX_TRACE_RARP_EVENTS, 0, 0);
/* Disable interrupts. */
TX_DISABLE
/* Initialize the outcome to cancelling RARP enable. */
rarp_enable = NX_FALSE;
/* Loop through all the interfaces. */
for (i = 0; i < NX_MAX_PHYSICAL_INTERFACES; i++)
{
/* Skip the interfaces that are not initialized or is not Ethernet-like.*/
if ((ip_ptr -> nx_ip_interface[i].nx_interface_valid == 0) ||
(ip_ptr -> nx_ip_interface[i].nx_interface_address_mapping_needed == 0))
{
continue;
}
/* Does this interface need a valid IP address? */
if (ip_ptr -> nx_ip_interface[i].nx_interface_ip_address == 0)
{
/* Yes, reset to the flag to enable RARP. */
rarp_enable = NX_TRUE;
break;
}
}
if (rarp_enable == NX_FALSE)
{
/* Error, all host interfaces already have a valid IP address (non-zero). */
/* Restore interrupts. */
TX_RESTORE
/* Return to caller. */
return(NX_IP_ADDRESS_ERROR);
}
/* Check to see if RARP has been enabled already. */
if (ip_ptr -> nx_ip_rarp_periodic_update)
{
/* Error, IP instance already has RARP enabled. */
/* Restore interrupts. */
TX_RESTORE
/* Return to caller. */
return(NX_ALREADY_ENABLED);
}
/* Setup the RARP periodic update routine. */
ip_ptr -> nx_ip_rarp_periodic_update = _nx_rarp_periodic_update;
/* Restore interrupts. */
TX_RESTORE
/* Return successful completion. */
return(NX_SUCCESS);
#else /* NX_DISABLE_IPV4 */
NX_PARAMETER_NOT_USED(ip_ptr);
return(NX_NOT_SUPPORTED);
#endif /* !NX_DISABLE_IPV4 */
}
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