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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_ipv6.h"
#include "nx_icmpv6.h"
#ifdef FEATURE_NX_IPV6
#ifndef NX_DISABLE_ICMPV6_ROUTER_ADVERTISEMENT_PROCESS
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_icmpv6_validate_ra PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function validates incoming router advertisement messages. */
/* */
/* INPUT */
/* */
/* packet_ptr ICMP packet pointer */
/* */
/* OUTPUT */
/* */
/* NX_SUCCESS Successful completion (no */
/* option fields to validate) */
/* NX_NOT_SUCCESSFUL Invalid ICMP header data */
/* */
/* CALLS */
/* */
/* IPv6_Address_Type Find IP address type. */
/* _nx_icmpv6_validate_options Validate option field. */
/* */
/* CALLED BY */
/* */
/* _nx_icmpv6_process_ra 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 */
/* */
/**************************************************************************/
UINT _nx_icmpv6_validate_ra(NX_PACKET *packet_ptr)
{
NX_IPV6_HEADER *ipv6_header;
NX_ICMPV6_RA *header_ptr;
NX_ICMPV6_OPTION *option_ptr;
INT option_length;
ULONG source_address_type, dest_address_type;
/* Set a pointer to he ICMP message header. */
/*lint -e{927} -e{826} suppress cast of pointer to pointer, since it is necessary */
header_ptr = (NX_ICMPV6_RA *)packet_ptr -> nx_packet_prepend_ptr;
/* Set a pointer to the IPv6 header. */
/*lint -e{927} -e{826} suppress cast of pointer to pointer, since it is necessary */
ipv6_header = (NX_IPV6_HEADER *)packet_ptr -> nx_packet_ip_header;
source_address_type = IPv6_Address_Type(ipv6_header -> nx_ip_header_source_ip);
dest_address_type = IPv6_Address_Type(ipv6_header -> nx_ip_header_destination_ip);
/* Validate the IP header information. */
/* The source address must be the link local router address. RFC2461 4.2 */
if ((source_address_type & IPV6_ADDRESS_LINKLOCAL) != IPV6_ADDRESS_LINKLOCAL)
{
return(NX_NOT_SUCCESSFUL);
}
/* IP destination address must be multicast address or solicited sender link local address. */
if ((dest_address_type != (ULONG)(IPV6_ADDRESS_LINKLOCAL | IPV6_ADDRESS_UNICAST)) &&
(dest_address_type != (ULONG)(IPV6_ALL_NODE_MCAST | IPV6_ADDRESS_MULTICAST)))
{
return(NX_NOT_SUCCESSFUL);
}
/* The IP header hop limit must be 255 */
if ((ipv6_header -> nx_ip_header_word_1 & 0xFF) != 0xFF)
{
return(NX_NOT_SUCCESSFUL);
}
/* Validate ICMP fields */
if (header_ptr -> nx_icmpv6_ra_icmpv6_header.nx_icmpv6_header_code != 0)
{
return(NX_NOT_SUCCESSFUL);
}
/* Locate the option field. */
/*lint -e{923} suppress cast between pointer and ULONG, since it is necessary */
option_ptr = (NX_ICMPV6_OPTION *)NX_UCHAR_POINTER_ADD(header_ptr, sizeof(NX_ICMPV6_RA));
option_length = (INT)(packet_ptr -> nx_packet_length - sizeof(NX_ICMPV6_RA));
/* Check for options (if there is a non zero option length ICMPv6 header field). */
if (option_length)
{
/* Validate option field(s). */
return(_nx_icmpv6_validate_options(option_ptr, option_length, NX_NULL));
}
return(NX_SUCCESS);
}
#endif /* NX_DISABLE_ICMPV6_ROUTER_ADVERTISEMENT_PROCESS */
#endif /* FEATURE_NX_IPV6 */
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