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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"
#include "nx_packet.h"
#ifndef NX_DISABLE_IPV4
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_arp_probe_send PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function builds an ARP Probe packet and calls the associated */
/* driver to send it out on the specified network interface. */
/* */
/* INPUT */
/* */
/* ip_ptr Pointer to IP instance */
/* interface_index IP Interface Index */
/* probe_address Probe address */
/* */
/* OUTPUT */
/* */
/* NX_SUCCESS Successful completion status */
/* NX_NO_PACKET No packet available to send */
/* */
/* CALLS */
/* */
/* _nx_packet_allocate Allocate a packet for the */
/* ARP Probe */
/* [ip_link_driver] User supplied link driver */
/* */
/* CALLED BY */
/* */
/* Application 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_probe_send(NX_IP *ip_ptr, UINT interface_index, ULONG probe_address)
{
NX_INTERFACE *nx_interface;
NX_PACKET *request_ptr;
ULONG *message_ptr;
NX_IP_DRIVER driver_request;
/* Allocate a packet to build the ARP Probe 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_ARP_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_ARP_MESSAGE_SIZE), NX_NO_WAIT))
{
/* Error getting packet, so just get out! */
return(NX_NO_PACKET);
}
}
#ifdef NX_ENABLE_DUAL_PACKET_POOL
else
{
/* Error getting packet, so just get out! */
return(NX_NO_PACKET);
}
}
#endif /* NX_ENABLE_DUAL_PACKET_POOL */
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, request_ptr);
/* Get mutex protection. */
tx_mutex_get(&(ip_ptr -> nx_ip_protection), TX_WAIT_FOREVER);
/* Set nx_interface. */
nx_interface = &(ip_ptr -> nx_ip_interface[interface_index]);
/* Store the probe address. */
nx_interface -> nx_interface_ip_probe_address = probe_address;
/* Stamp the packet with the outgoing interface information. */
/*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 = nx_interface;
#ifndef NX_DISABLE_ARP_INFO
/* Increment the ARP requests sent count. */
ip_ptr -> nx_ip_arp_requests_sent++;
#endif
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_INTERNAL_ARP_REQUEST_SEND, ip_ptr, probe_address, request_ptr, 0, NX_TRACE_INTERNAL_EVENTS, 0, 0);
/* Build the ARP Probe packet. */
/* Setup the size of the ARP message. */
request_ptr -> nx_packet_length = NX_ARP_MESSAGE_SIZE;
/* Setup the prepend pointer. */
request_ptr -> nx_packet_prepend_ptr -= NX_ARP_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_ARP_HARDWARE_TYPE << 16) | (NX_ARP_PROTOCOL_TYPE);
*(message_ptr + 1) = (ULONG)(NX_ARP_HARDWARE_SIZE << 24) | (NX_ARP_PROTOCOL_SIZE << 16) |
NX_ARP_OPTION_REQUEST;
/*lint -e{613} suppress possible use of null pointer, since nx_interface must not be NULL. */
*(message_ptr + 2) = (ULONG)(nx_interface -> nx_interface_physical_address_msw << 16) |
(nx_interface -> nx_interface_physical_address_lsw >> 16);
/*lint -e{613} suppress possible use of null pointer, since nx_interface must not be NULL. */
*(message_ptr + 3) = (ULONG)(nx_interface -> nx_interface_physical_address_lsw << 16);
*(message_ptr + 4) = (ULONG)0;
*(message_ptr + 5) = (ULONG)0;
*(message_ptr + 6) = (ULONG)probe_address;
/* Endian swapping logic. If NX_LITTLE_ENDIAN is specified, these macros will
swap the endian of the ARP 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));
/* Set up the driver request. */
driver_request.nx_ip_driver_ptr = ip_ptr;
driver_request.nx_ip_driver_command = NX_LINK_ARP_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 = nx_interface;
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_INTERNAL_IO_DRIVER_ARP_SEND, ip_ptr, request_ptr, request_ptr -> nx_packet_length, 0, NX_TRACE_INTERNAL_EVENTS, 0, 0);
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, request_ptr);
/* Send the ARP Probe packet to the driver. */
/*lint -e{613} suppress possible use of null pointer, since nx_interface must not be NULL. */
(nx_interface -> nx_interface_link_driver_entry)(&driver_request);
/* Release mutex protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return a successful completion. */
return(NX_SUCCESS);
}
#endif /* !NX_DISABLE_IPV4 */
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