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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 */
/** */
/** Internet Protocol (IP) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "tx_thread.h"
#include "nx_ip.h"
#include "nx_packet.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_ip_raw_packet_processing PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function processes a received raw IP packet from the */
/* _nx_ip_packet_receive function and either queues it or gives it to */
/* the first suspended thread waiting for a raw IP packet. */
/* */
/* INPUT */
/* */
/* ip_ptr Pointer to IP control block */
/* packet_ptr Pointer to packet to send */
/* protocol The upper layer protocol */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _tx_thread_system_resume Resume suspended thread */
/* _nx_packet_release Release the raw packet */
/* [nx_ip_raw_packet_filter] User-defined packet filter */
/* */
/* CALLED BY */
/* */
/* _nx_ip_packet_receive Packet receive processing */
/* */
/* 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_ip_raw_packet_processing(NX_IP *ip_ptr, ULONG protocol, NX_PACKET *packet_ptr)
{
TX_INTERRUPT_SAVE_AREA
TX_THREAD *thread_ptr;
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr);
#ifdef NX_ENABLE_IP_RAW_PACKET_FILTER
/* If raw packet filter is installed */
if (ip_ptr -> nx_ip_raw_packet_filter)
{
if ((ip_ptr -> nx_ip_raw_packet_filter)(ip_ptr, (protocol >> 16) & 0xFF, packet_ptr) != NX_SUCCESS)
{
return(1); /* Raw filter did not consume this packet. Allow the caller to process this packet. */
}
else
{
return(NX_SUCCESS); /* The caller should not process this packet. */
}
}
#else
NX_PARAMETER_NOT_USED(protocol);
#endif /* NX_ENABLE_IP_RAW_PACKET_FILTER */
/* Disable interrupts. */
TX_DISABLE
/* Determine if there is a thread waiting for the IP packet. If so, just
give the packet to the waiting thread. */
thread_ptr = ip_ptr -> nx_ip_raw_packet_suspension_list;
if (thread_ptr)
{
/* Yes, a thread is suspended on the raw IP packet queue. */
/* See if this is the only suspended thread on the list. */
if (thread_ptr == thread_ptr -> tx_thread_suspended_next)
{
/* Yes, the only suspended thread. */
/* Update the head pointer. */
ip_ptr -> nx_ip_raw_packet_suspension_list = NX_NULL;
}
else
{
/* At least one more thread is on the same expiration list. */
/* Update the list head pointer. */
ip_ptr -> nx_ip_raw_packet_suspension_list = thread_ptr -> tx_thread_suspended_next;
/* Update the links of the adjacent threads. */
(thread_ptr -> tx_thread_suspended_next) -> tx_thread_suspended_previous =
thread_ptr -> tx_thread_suspended_previous;
(thread_ptr -> tx_thread_suspended_previous) -> tx_thread_suspended_next =
thread_ptr -> tx_thread_suspended_next;
}
/* Decrement the suspension count. */
ip_ptr -> nx_ip_raw_packet_suspended_count--;
/* Prepare for resumption of the first thread. */
/* Clear cleanup routine to avoid timeout. */
thread_ptr -> tx_thread_suspend_cleanup = TX_NULL;
/* Temporarily disable preemption. */
_tx_thread_preempt_disable++;
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr);
/* Restore interrupts. */
TX_RESTORE
/* Return this packet pointer to the suspended thread waiting for
a block. */
*((NX_PACKET **)thread_ptr -> tx_thread_additional_suspend_info) = packet_ptr;
/* Put return status into the thread control block. */
thread_ptr -> tx_thread_suspend_status = NX_SUCCESS;
/* Resume thread. */
_tx_thread_system_resume(thread_ptr);
}
else
{
/* The packet is queued only if the number of packets in the queue does not exceed
user-speicified limit. */
if (ip_ptr -> nx_ip_raw_received_packet_count >= ip_ptr -> nx_ip_raw_received_packet_max)
{
_nx_packet_release(packet_ptr);
return(NX_SUCCESS); /* This packet has been released so the caller should not
further process it. */
}
/* Otherwise, queue the raw IP packet in a FIFO manner on the raw packet list. */
/* Clear the next packet pointer. */
packet_ptr -> nx_packet_queue_next = NX_NULL;
/* Determine if the queue is empty. */
if (ip_ptr -> nx_ip_raw_received_packet_tail)
{
/* List is not empty, place the raw packet at the end of the raw packet list. */
(ip_ptr -> nx_ip_raw_received_packet_tail) -> nx_packet_queue_next = packet_ptr;
ip_ptr -> nx_ip_raw_received_packet_tail = packet_ptr;
}
else
{
/* This is the first entry on the queue so set the head and tail pointers. */
ip_ptr -> nx_ip_raw_received_packet_head = packet_ptr;
ip_ptr -> nx_ip_raw_received_packet_tail = packet_ptr;
}
/* Increment the raw packet received count. */
ip_ptr -> nx_ip_raw_received_packet_count++;
/* Restore interrupts. */
TX_RESTORE
}
/* The packet is enqueued, therefore return NX_SUCCESS so the stack does not
further process this packet. */
return(NX_SUCCESS);
}