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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 "nx_ipv6.h"
#include "nx_icmpv6.h"
#ifdef FEATURE_NX_IPV6
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_ipv6_option_error PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function handles an invalid Options header packet by examining */
/* the option header option type's most significant bits and */
/* determining if an error message is sent and if the rest of the */
/* packet should be processed or discarded. */
/* */
/* INPUT */
/* */
/* ip_ptr Pointer to IP control block */
/* packet_ptr Pointer to packet to send */
/* option_type The type of option */
/* offset Where the error occurs */
/* */
/* */
/* OUTPUT */
/* */
/* NX_SUCCESS Skip this option; no errors */
/* NX_OPTION_HEADER_ERROR Error; Drop the entire packet*/
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* _nx_ipv6_process_hop_by_hop_option */
/* */
/* 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_ipv6_option_error(NX_IP *ip_ptr, NX_PACKET *packet_ptr, UCHAR option_type, UINT offset)
{
UINT rv = NX_SUCCESS;
/*lint -e{927} -e{826} suppress cast of pointer to pointer, since it is necessary */
NX_IPV6_HEADER *ip_header_ptr = (NX_IPV6_HEADER *)packet_ptr -> nx_packet_ip_header;
/* Top 2 bits of the option type indicate how we shall process this option
in case of an error. */
switch (option_type >> 6)
{
case 3: /* Discard the packet and send ICMP Parameter Problem to unicast address */
if ((ip_header_ptr -> nx_ip_header_destination_ip[0] & (ULONG)0xFF000000) == (ULONG)0xFF000000)
{
/* If the destination address is a multicast address, we discard the packet. */
rv = NX_OPTION_HEADER_ERROR;
break;
}
/*
No need to break here: execute the next two cases:
(1) transmit ICMP error message
(2) release the packet.
*/
/*lint -e{825} suppress fallthrough, since it is necessary. */ /* fallthrough */
case 2: /* Discard the packet and send ICMP Parameter Problem */
#ifndef NX_DISABLE_ICMPV6_ERROR_MESSAGE
NX_ICMPV6_SEND_PARAMETER_PROBLEM(ip_ptr, packet_ptr, 2, (ULONG)(offset + sizeof(NX_IPV6_HEADER)));
#else
NX_PARAMETER_NOT_USED(ip_ptr);
NX_PARAMETER_NOT_USED(offset);
#endif
/* No break here. Execute the next statement to release the packet. */
/*lint -e{825} suppress fallthrough, since it is necessary. */ /* fallthrough */
case 1: /* Discard the packet */
/* Error status - Drop the packet */
rv = NX_OPTION_HEADER_ERROR;
break;
case 0: /* Skip over this option and continue processing the rest of the packet. */
default:
break;
}
return(rv);
}
#endif /* FEATURE_NX_IPV6 */
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