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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"
#include "nx_packet.h"
#ifdef NX_IPSEC_ENABLE
#include "nx_ipsec.h"
#endif /* NX_IPSEC_ENABLE */
#ifdef FEATURE_NX_IPV6
#ifdef NX_ENABLE_IPV6_PATH_MTU_DISCOVERY
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_icmpv6_process_packet_too_big PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function handles an ICMPv6 error message indicating the next */
/* hop or beyond has a smaller MTU that the packet payload. It sets */
/* the IP task MTU to the next hop MTU in the option header. */
/* */
/* This function is called from IP thread periodic process routine. */
/* It starts the minimum Path MTU Discovery process if the interface */
/* address after the IP instance is initialized and its MTU established*/
/* by the Ethernet driver. */
/* */
/* INPUT */
/* */
/* ip_ptr Pointer to IP instance */
/* packet_ptr Pointer to Packet Too Big */
/* ICMPv6 packet received */
/* */
/* OUTPUT */
/* */
/* NX_SUCCESS Successful completion */
/* */
/* CALLS */
/* */
/* _nx_icmpv6_dest_table_find Find destination in table and */
/* update path MTU in table */
/* memset Set the memory */
/* */
/* CALLED BY */
/* */
/* */
/* 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_process_packet_too_big(NX_IP *ip_ptr, NX_PACKET *packet_ptr)
{
UINT status = NX_INVALID_MTU_DATA;
NX_ICMPV6_OPTION_MTU *icmpv6_mtu_option_ptr;
ULONG mtu;
NX_IPV6_DESTINATION_ENTRY *dest_entry_ptr;
ULONG *original_destination_ip;
ULONG default_next_hop_address[4];
NX_IPV6_HEADER *ip_header_ptr, *original_ip_header_ptr;
NX_INTERFACE *if_ptr;
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr);
#ifndef NX_DISABLE_RX_SIZE_CHECKING
if (packet_ptr -> nx_packet_length < sizeof(NX_ICMPV6_OPTION_MTU))
{
#ifndef NX_DISABLE_ICMP_INFO
/* Increment the ICMP invalid message count. */
ip_ptr -> nx_ip_icmp_invalid_packets++;
#endif
/* Invalid ICMP message, just release it. */
_nx_packet_release(packet_ptr);
return(NX_NOT_SUCCESSFUL);
}
#endif /* NX_DISABLE_RX_SIZE_CHECKING */
memset(&default_next_hop_address[0], 0, (4 * sizeof(ULONG)));
if_ptr = packet_ptr -> nx_packet_address.nx_packet_ipv6_address_ptr -> nxd_ipv6_address_attached;
/* Set a local pointer to the ICMPv6 Option data. */
/*lint -e{927} -e{826} suppress cast of pointer to pointer, since it is necessary */
icmpv6_mtu_option_ptr = (NX_ICMPV6_OPTION_MTU *)packet_ptr -> nx_packet_prepend_ptr;
/* Parse the original sender data. */
/*lint -e{929} -e{826} -e{740} suppress cast of pointer to pointer, since it is necessary */
original_ip_header_ptr = (NX_IPV6_HEADER *)(&(icmpv6_mtu_option_ptr -> nx_icmpv6_option_mtu_message));
/* Extract the original sender from the IP header. */
packet_ptr -> nx_packet_prepend_ptr -= sizeof(NX_IPV6_HEADER);
/*lint -e{927} -e{826} suppress cast of pointer to pointer, since it is necessary */
ip_header_ptr = (NX_IPV6_HEADER *)packet_ptr -> nx_packet_ip_header;
/* Yes this looks like a valid IP header for the original offending packet. */
original_destination_ip = original_ip_header_ptr -> nx_ip_header_destination_ip;
NX_IPV6_ADDRESS_CHANGE_ENDIAN(original_destination_ip);
COPY_IPV6_ADDRESS(ip_header_ptr -> nx_ip_header_source_ip, &default_next_hop_address[0]);
/* Handle endianness. */
NX_CHANGE_ULONG_ENDIAN(icmpv6_mtu_option_ptr -> nx_icmpv6_option_mtu_path_mtu);
/* Create a local variable for convenience. */
mtu = icmpv6_mtu_option_ptr -> nx_icmpv6_option_mtu_path_mtu;
/* MTU data is valid if it is non zero, and is no more than the driver MTU. */
if ((mtu > 0) && (mtu <= if_ptr -> nx_interface_ip_mtu_size))
{
/* Add destination table. */
status = _nx_icmpv6_dest_table_add(ip_ptr, original_destination_ip,
&dest_entry_ptr, &default_next_hop_address[0], mtu, 0,
packet_ptr -> nx_packet_address.nx_packet_ipv6_address_ptr);
}
/* Release the packet. */
_nx_packet_release(packet_ptr);
/* Return the completion code. */
return(status);
}
#endif /* NX_ENABLE_IPV6_PATH_MTU_DISCOVERY */
#endif /* FEATURE_NX_IPV6 */
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