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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 */
/** */
/** Internet Control Message Protocol (ICMP) */
/** */
/**************************************************************************/
/**************************************************************************/
#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_icmpv6_validate_options PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function validates ICMPv6 additional options. */
/* */
/* INPUT */
/* */
/* option Pointer to ICMPv6 option */
/* length Length of the Option field */
/* additional_check Whether or not caller wishes to */
/* perform additoinal verification */
/* */
/* OUTPUT */
/* */
/* NX_SUCCESS Options are valid */
/* NX_NOT_SUCCESS Options are invalid */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* _nx_icmpv6_validate_neighbor_messages */
/* _nx_icmpv6_validate_ra */
/* */
/**************************************************************************/
UINT _nx_icmpv6_validate_options(NX_ICMPV6_OPTION *option, INT length, INT additional_check)
{
UINT option_len;
/* Parse all option headers from the ICMPv6 header. */
/* GHSA-rf32-h832-hg8r:
Verify that the length is at least 2 to cover nx_icmpv6_option_length and
nx_icmpv6_option_type. */
while (length > 2)
{
/* Verify that the option length is not zero. */
if (option -> nx_icmpv6_option_length == 0)
{
return(NX_NOT_SUCCESSFUL);
}
/* Also check for NO SOURCE LINK LAYER ADDRESS. */
if ((additional_check == NX_NO_SLLA) &&
(option -> nx_icmpv6_option_type == 1))
{
return(NX_NOT_SUCCESSFUL);
}
/* Get the next option. */
option_len = ((UINT)option -> nx_icmpv6_option_length) << 3;
length -= (INT)option_len;
/*lint -e{923} suppress cast between pointer and ULONG, since it is necessary */
option = (NX_ICMPV6_OPTION *)NX_UCHAR_POINTER_ADD(option, option_len);
}
if (length < 0)
{
/* Invalid packet length. */
return(NX_NOT_SUCCESSFUL);
}
return(NX_SUCCESS);
}
#endif /* FEATURE_NX_IPV6 */
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