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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_ip.h"
#include "nx_packet.h"
#ifndef NX_DISABLE_IPV4
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_arp_queue_send PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function sends packets from the ARP queue. */
/* */
/* INPUT */
/* */
/* ip_ptr Pointer to IP instance */
/* arp_ptr Pointer to ARP entry */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _nx_packet_transmit_release Release ARP queued packet */
/* (nx_ip_fragment_processing) Fragment processing */
/* (ip_interface_link_driver_entry) User supplied link driver */
/* */
/* CALLED BY */
/* */
/* _nx_arp_static_entry_create Create static entry */
/* _nx_arp_dynamic_entry_set Set dynamic entry */
/* _nx_arp_packet_receive Process the ARP packet */
/* */
/**************************************************************************/
VOID _nx_arp_queue_send(NX_IP *ip_ptr, NX_ARP *arp_ptr)
{
TX_INTERRUPT_SAVE_AREA
NX_PACKET *queued_list_head;
NX_PACKET *packet_ptr;
NX_IP_DRIVER driver_request;
/* Initialize the queued list head to NULL. */
queued_list_head = NX_NULL;
/* Determine if this ARP entry has a packet queued up for sending. */
/* Disable interrupts before checking. */
TX_DISABLE
/* Look at the ARP packet queue pointer. */
if (arp_ptr -> nx_arp_packets_waiting)
{
/* Pickup the packet pointer and clear the ARP queue pointer. */
queued_list_head = arp_ptr -> nx_arp_packets_waiting;
arp_ptr -> nx_arp_packets_waiting = NX_NULL;
}
/* Restore previous interrupt posture. */
TX_RESTORE
/* Are there any packets queued to send? */
while (queued_list_head)
{
/* Pickup the first entry on the list. */
packet_ptr = queued_list_head;
/* Move to the next entry on the ARP packet queue. */
queued_list_head = queued_list_head -> nx_packet_queue_next;
/* Clear the packet's queue next pointer. */
packet_ptr -> nx_packet_queue_next = NX_NULL;
packet_ptr -> nx_packet_address.nx_packet_interface_ptr = arp_ptr -> nx_arp_ip_interface;
/* Build the driver request packet. */
driver_request.nx_ip_driver_physical_address_msw = arp_ptr -> nx_arp_physical_address_msw;
driver_request.nx_ip_driver_physical_address_lsw = arp_ptr -> nx_arp_physical_address_lsw;
driver_request.nx_ip_driver_ptr = ip_ptr;
driver_request.nx_ip_driver_command = NX_LINK_PACKET_SEND;
driver_request.nx_ip_driver_packet = packet_ptr;
driver_request.nx_ip_driver_interface = packet_ptr -> nx_packet_address.nx_packet_interface_ptr;
/* Determine if fragmentation is needed. */
if (packet_ptr -> nx_packet_length > packet_ptr -> nx_packet_address.nx_packet_interface_ptr -> nx_interface_ip_mtu_size)
{
#ifndef NX_DISABLE_FRAGMENTATION
/* Fragmentation is needed, call the fragment routine if available. */
if (ip_ptr -> nx_ip_fragment_processing)
{
/* Call the IP fragment processing routine. */
(ip_ptr -> nx_ip_fragment_processing)(&driver_request);
}
else
{
#endif /* NX_DISABLE_FRAGMENTATION */
#ifndef NX_DISABLE_IP_INFO
/* Increment the IP send packets dropped count. */
ip_ptr -> nx_ip_send_packets_dropped++;
#endif
/* Just release the packet. */
_nx_packet_transmit_release(packet_ptr);
#ifndef NX_DISABLE_FRAGMENTATION
}
#endif /* NX_DISABLE_FRAGMENTATION */
}
else
{
#ifndef NX_DISABLE_IP_INFO
/* Increment the IP packet sent count. */
ip_ptr -> nx_ip_total_packets_sent++;
/* Increment the IP bytes sent count. */
ip_ptr -> nx_ip_total_bytes_sent += packet_ptr -> nx_packet_length - (ULONG)sizeof(NX_IPV4_HEADER);
#endif
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_INTERNAL_IO_DRIVER_PACKET_SEND, ip_ptr, packet_ptr, packet_ptr -> nx_packet_length, 0, NX_TRACE_INTERNAL_EVENTS, 0, 0);
/* Send the queued IP packet out on the network via the attached driver. */
(packet_ptr -> nx_packet_address.nx_packet_interface_ptr -> nx_interface_link_driver_entry)(&driver_request);
}
}
}
#endif /* !NX_DISABLE_IPV4 */
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