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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
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_icmpv6_validate_neighbor_message PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This internal function validates incoming neighbor advertisement */
/* message and neighbor solicitation message. */
/* */
/* INPUT */
/* */
/* packet_ptr ICMPv6 packet to validate */
/* */
/* OUTPUT */
/* */
/* NX_SUCCESS ICMPv6 options are valid */
/* NX_NOT_SUCCESS ICMPv6 options are invalid */
/* */
/* CALLS */
/* */
/* IPv6_Address_Type Determine address type (e.g. unicast) */
/* _nx_icmpv6_validate_options Validate option fields in ICMP header */
/* */
/* CALLED BY */
/* */
/* _nx_icmpv6_process_ns Process received NS packet */
/* _nx_icmpv6_process_na Process received NA packet */
/* */
/* 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_neighbor_message(NX_PACKET *packet_ptr)
{
NX_ICMPV6_ND *nd_header_ptr;
NX_IPV6_HEADER *ipv6_header;
NX_ICMPV6_OPTION *option_ptr;
UINT option_length;
UINT option_check;
ULONG source_address_type;
ULONG dest_address_type;
/* Points 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;
/*
* Validate the IP header information.
* The following validation procedure is defined in RFC2461
* 7.1.1: Validation of Neighbor Solicitations
* 7.1.2: Validation of Neighbor Advertisements
*/
/* Hop limit must be 255, I.e., the packet could not possibly have been forwarded by a router. */
if ((ipv6_header -> nx_ip_header_word_1 & 0xFF) != 0xFF)
{
return(NX_NOT_SUCCESSFUL);
}
/* Points to the ICMP message header. */
/*lint -e{927} -e{826} suppress cast of pointer to pointer, since it is necessary */
nd_header_ptr = (NX_ICMPV6_ND *)packet_ptr -> nx_packet_prepend_ptr;
/* ICMP code must be 0 */
if (nd_header_ptr -> nx_icmpv6_nd_header.nx_icmpv6_header_code != 0)
{
return(NX_NOT_SUCCESSFUL);
}
/* ICMP length (derived from the IP Length) is 24 or more. */
if (packet_ptr -> nx_packet_length < 24)
{
return(NX_NOT_SUCCESSFUL);
}
/* Target Address must not be a multicast address. */
if ((nd_header_ptr -> nx_icmpv6_nd_targetAddress[0] & (ULONG)0xFF000000) == (ULONG)0xFF000000)
{
return(NX_NOT_SUCCESSFUL);
}
/* Find out the destination IP address type. */
dest_address_type = IPv6_Address_Type(ipv6_header -> nx_ip_header_destination_ip);
option_check = 0;
if (nd_header_ptr -> nx_icmpv6_nd_header.nx_icmpv6_header_type == NX_ICMPV6_NEIGHBOR_SOLICITATION_TYPE)
{
/* Find out the source IP address type. */
source_address_type = IPv6_Address_Type(ipv6_header -> nx_ip_header_source_ip);
/* If the IP source address is the unspecified address, the IP destination address
is a solicated-node multicast address. */
if (source_address_type == IPV6_ADDRESS_UNSPECIFIED)
{
if ((dest_address_type & IPV6_SOLICITED_NODE_MCAST) != IPV6_SOLICITED_NODE_MCAST)
{
return(NX_NOT_SUCCESSFUL);
}
/* if the IP source address is the unspecified address, it must not contain
source link-layer address option in the message. */
option_check = NX_NO_SLLA;
}
}
else
{
/* If the IP Destination Address is a multicast address, the
Solicted flag must be zero. */
if (((ipv6_header -> nx_ip_header_destination_ip[0] & (ULONG)0xFF000000) == (ULONG)0xFF000000) &&
nd_header_ptr -> nx_icmpv6_nd_flag & 0x40000000)
{
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(nd_header_ptr, sizeof(NX_ICMPV6_ND));
option_length = (UINT)(packet_ptr -> nx_packet_length - sizeof(NX_ICMPV6_ND));
/* Validate option fields if there are any. */
if (option_length)
{
return(_nx_icmpv6_validate_options(option_ptr, (INT)option_length, (INT)option_check));
}
return(NX_SUCCESS);
}
#endif /* FEATURE_NX_IPV6 */
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