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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 Control Message Protocol (ICMP) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_packet.h"
#include "nx_ip.h"
#include "nx_icmp.h"
#ifdef NX_IPSEC_ENABLE
#include "nx_ipsec.h"
#endif /* NX_IPSEC_ENABLE */
#ifndef NX_DISABLE_IPV4
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_icmpv4_packet_process PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function processes the ICMPv4 received packet and lifts any */
/* associated threads suspended on it. */
/* */
/* INPUT */
/* */
/* ip_ptr Pointer to IP control block */
/* packet_ptr ICMP packet pointer */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _nx_ip_checksum_compute Compute checksum */
/* _nx_ip_packet_send Send ICMP packet out */
/* _nx_packet_release Release packet to packet pool */
/* _tx_thread_system_resume Resume suspended thread */
/* _tx_thread_system_preempt_check Check for preemption */
/* */
/* CALLED BY */
/* */
/* _nx_icmp_packet_process Main ICMP packet pocess */
/* */
/* 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 */
/* */
/**************************************************************************/
VOID _nx_icmpv4_packet_process(NX_IP *ip_ptr, NX_PACKET *packet_ptr)
{
NX_ICMPV4_HEADER *header_ptr;
USHORT checksum;
#if defined(NX_DISABLE_ICMPV4_RX_CHECKSUM) || defined(NX_ENABLE_INTERFACE_CAPABILITY) || defined(NX_IPSEC_ENABLE)
UINT compute_checksum = 1;
#endif /* defined(NX_DISABLE_ICMPV4_RX_CHECKSUM) || defined(NX_ENABLE_INTERFACE_CAPABILITY) || defined(NX_IPSEC_ENABLE) */
#ifdef TX_ENABLE_EVENT_TRACE
NX_IPV4_HEADER *ip_header_ptr;
#endif /* TX_ENABLE_EVENT_TRACE */
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr);
/* Point to the ICMP message header. */
/*lint -e{927} -e{826} suppress cast of pointer to pointer, since it is necessary */
header_ptr = (NX_ICMPV4_HEADER *)packet_ptr -> nx_packet_prepend_ptr;
#ifdef NX_DISABLE_ICMPV4_RX_CHECKSUM
compute_checksum = 0;
#endif /* NX_DISABLE_ICMPV4_RX_CHECKSUM */
#ifdef NX_ENABLE_INTERFACE_CAPABILITY
if (packet_ptr -> nx_packet_address.nx_packet_interface_ptr -> nx_interface_capability_flag & NX_INTERFACE_CAPABILITY_ICMPV4_RX_CHECKSUM)
{
compute_checksum = 0;
}
#endif /* NX_ENABLE_INTERFACE_CAPABILITY */
#ifdef NX_IPSEC_ENABLE
if ((packet_ptr -> nx_packet_ipsec_sa_ptr != NX_NULL) && (((NX_IPSEC_SA *)(packet_ptr -> nx_packet_ipsec_sa_ptr)) -> nx_ipsec_sa_encryption_method != NX_CRYPTO_NONE))
{
compute_checksum = 1;
}
#endif
#if defined(NX_DISABLE_ICMPV4_RX_CHECKSUM) || defined(NX_ENABLE_INTERFACE_CAPABILITY) || defined(NX_IPSEC_ENABLE)
if (compute_checksum)
#endif /* defined(NX_DISABLE_ICMPV4_RX_CHECKSUM) || defined(NX_ENABLE_INTERFACE_CAPABILITY) || defined(NX_IPSEC_ENABLE) */
{
/* Calculate the ICMP message checksum. */
checksum = _nx_ip_checksum_compute(packet_ptr, NX_IP_ICMP,
(UINT)packet_ptr -> nx_packet_length,
/* ICMPv4 checksum does not include
src/dest addresses */
NX_NULL, NX_NULL);
checksum = ((USHORT) ~checksum) & NX_LOWER_16_MASK;
/* Determine if the checksum is valid. */
if (checksum)
{
#ifndef NX_DISABLE_ICMP_INFO
/* Increment the ICMP invalid packet error. */
ip_ptr -> nx_ip_icmp_invalid_packets++;
/* Increment the ICMP checksum error count. */
ip_ptr -> nx_ip_icmp_checksum_errors++;
#endif
/* Nope, the checksum is invalid. Toss this ICMP packet out. */
_nx_packet_release(packet_ptr);
return;
}
}
/* Determine the message type and call the appropriate handler. */
if (header_ptr -> nx_icmpv4_header_type == NX_ICMP_ECHO_REPLY_TYPE)
{
_nx_icmpv4_process_echo_reply(ip_ptr, packet_ptr);
}
else if (header_ptr -> nx_icmpv4_header_type == NX_ICMP_ECHO_REQUEST_TYPE)
{
_nx_icmpv4_process_echo_request(ip_ptr, packet_ptr);
}
else
{
#ifndef NX_DISABLE_ICMP_INFO
/* Increment the ICMP unhandled message count. */
ip_ptr -> nx_ip_icmp_unhandled_messages++;
#endif
#ifdef TX_ENABLE_EVENT_TRACE
/* Set the IP header. */
ip_header_ptr = (NX_IPV4_HEADER *)packet_ptr -> nx_packet_ip_header;
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_INTERNAL_ICMP_RECEIVE, ip_ptr, ip_header_ptr -> nx_ip_header_source_ip, packet_ptr, 0, NX_TRACE_INTERNAL_EVENTS, 0, 0);
#endif /* TX_ENABLE_EVENT_TRACE */
/* Unhandled ICMP message, just release it. */
_nx_packet_release(packet_ptr);
}
}
#endif /* !NX_DISABLE_IPV4 */