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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"
#include "nx_packet.h"
#ifndef NX_DISABLE_IPV4
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_rarp_packet_send PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function builds an RARP packet and calls the associated driver */
/* to send it out on the network. */
/* */
/* INPUT */
/* */
/* ip_ptr Pointer to IP instance */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _nx_packet_allocate Allocate a packet for the */
/* RARP request */
/* (ip_link_driver) User supplied link driver */
/* */
/* CALLED BY */
/* */
/* NetX Source Code */
/* */
/**************************************************************************/
VOID _nx_rarp_packet_send(NX_IP *ip_ptr)
{
NX_PACKET *request_ptr;
ULONG *message_ptr;
NX_IP_DRIVER driver_request;
ULONG i;
/* Determine which interfaces to send RARP packets out from (e.g. do not have IP addresses). */
for (i = 0; i < NX_MAX_PHYSICAL_INTERFACES; i++)
{
/* Skip this interface if it is not initialized yet. */
if (ip_ptr -> nx_ip_interface[i].nx_interface_valid == 0)
{
continue;
}
/* If the interface has a valid address, skip it. */
if (ip_ptr -> nx_ip_interface[i].nx_interface_ip_address != 0)
{
continue;
}
/* Skip this interface if mapping is not required, i.e. the driver is not Ethernet-like. */
/*lint -e{539} suppress positive indentation. */
if (ip_ptr -> nx_ip_interface[i].nx_interface_address_mapping_needed == 0)
{
continue;
}
/* Allocate a packet to build the RARP message in. */
#ifdef NX_ENABLE_DUAL_PACKET_POOL
/* Allocate from auxiliary packet pool first. */
if (_nx_packet_allocate(ip_ptr -> nx_ip_auxiliary_packet_pool, &request_ptr, (NX_PHYSICAL_HEADER + NX_RARP_MESSAGE_SIZE), NX_NO_WAIT))
{
if (ip_ptr -> nx_ip_auxiliary_packet_pool != ip_ptr -> nx_ip_default_packet_pool)
#endif /* NX_ENABLE_DUAL_PACKET_POOL */
{
if (_nx_packet_allocate(ip_ptr -> nx_ip_default_packet_pool, &request_ptr, (NX_PHYSICAL_HEADER + NX_RARP_MESSAGE_SIZE), NX_NO_WAIT))
{
/* Error getting packet, so just get out! */
return;
}
}
#ifdef NX_ENABLE_DUAL_PACKET_POOL
else
{
/* Error getting packet, so just get out! */
return;
}
}
#endif /* NX_ENABLE_DUAL_PACKET_POOL */
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, request_ptr);
#ifndef NX_DISABLE_RARP_INFO
/* Increment the RARP requests sent count. */
ip_ptr -> nx_ip_rarp_requests_sent++;
#endif
/*lint -e{644} suppress variable might not be initialized, since "request_ptr" was initialized in _nx_packet_allocate. */
request_ptr -> nx_packet_address.nx_packet_interface_ptr = &(ip_ptr -> nx_ip_interface[i]);
/* Build the RARP request packet. */
/* Setup the size of the RARP message. */
request_ptr -> nx_packet_length = NX_RARP_MESSAGE_SIZE;
/* Setup the prepend pointer. */
request_ptr -> nx_packet_prepend_ptr -= NX_RARP_MESSAGE_SIZE;
/* Setup the pointer to the message area. */
/*lint -e{927} -e{826} suppress cast of pointer to pointer, since it is necessary */
message_ptr = (ULONG *)request_ptr -> nx_packet_prepend_ptr;
/* Write the Hardware type into the message. */
*message_ptr = (ULONG)(NX_RARP_HARDWARE_TYPE << 16) | (NX_RARP_PROTOCOL_TYPE);
*(message_ptr + 1) = (ULONG)(NX_RARP_HARDWARE_SIZE << 24) | (NX_RARP_PROTOCOL_SIZE << 16) | NX_RARP_OPTION_REQUEST;
*(message_ptr + 2) = (ULONG)(request_ptr -> nx_packet_address.nx_packet_interface_ptr -> nx_interface_physical_address_msw << 16) |
(request_ptr -> nx_packet_address.nx_packet_interface_ptr -> nx_interface_physical_address_lsw >> 16);
*(message_ptr + 3) = (ULONG)(request_ptr -> nx_packet_address.nx_packet_interface_ptr -> nx_interface_physical_address_lsw << 16);
*(message_ptr + 4) = (ULONG)(request_ptr -> nx_packet_address.nx_packet_interface_ptr -> nx_interface_physical_address_msw & NX_LOWER_16_MASK);
*(message_ptr + 5) = (ULONG)(request_ptr -> nx_packet_address.nx_packet_interface_ptr -> nx_interface_physical_address_lsw);
*(message_ptr + 6) = (ULONG)0;
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_INTERNAL_RARP_SEND, ip_ptr, 0, request_ptr, *(message_ptr + 1), NX_TRACE_INTERNAL_EVENTS, 0, 0);
/* Endian swapping logic. If NX_LITTLE_ENDIAN is specified, these macros will
swap the endian of the RARP message. */
NX_CHANGE_ULONG_ENDIAN(*(message_ptr));
NX_CHANGE_ULONG_ENDIAN(*(message_ptr + 1));
NX_CHANGE_ULONG_ENDIAN(*(message_ptr + 2));
NX_CHANGE_ULONG_ENDIAN(*(message_ptr + 3));
NX_CHANGE_ULONG_ENDIAN(*(message_ptr + 4));
NX_CHANGE_ULONG_ENDIAN(*(message_ptr + 5));
NX_CHANGE_ULONG_ENDIAN(*(message_ptr + 6));
/* Send the RARP request to the driver. */
driver_request.nx_ip_driver_ptr = ip_ptr;
driver_request.nx_ip_driver_command = NX_LINK_RARP_SEND;
driver_request.nx_ip_driver_packet = request_ptr;
driver_request.nx_ip_driver_physical_address_msw = 0xFFFFUL;
driver_request.nx_ip_driver_physical_address_lsw = 0xFFFFFFFFUL;
driver_request.nx_ip_driver_interface = request_ptr -> nx_packet_address.nx_packet_interface_ptr;
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_INTERNAL_IO_DRIVER_RARP_SEND, ip_ptr, request_ptr, request_ptr -> nx_packet_length, 0, NX_TRACE_INTERNAL_EVENTS, 0, 0);
(request_ptr -> nx_packet_address.nx_packet_interface_ptr -> nx_interface_link_driver_entry)(&driver_request);
}
return;
}
#endif /* !NX_DISABLE_IPV4 */
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