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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_ip.h"
#include "nx_ipv6.h"
#include "nx_packet.h"
#include "nx_icmpv6.h"
#if defined(FEATURE_NX_IPV6) && !defined(NX_DISABLE_FRAGMENTATION)
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_ipv6_process_fragment_option PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function processes the IPv6 Fragmentation Option header. */
/* */
/* INPUT */
/* */
/* ip_ptr Pointer to IP control block */
/* packet_ptr Pointer to packet to process */
/* */
/* OUTPUT */
/* */
/* NX_SUCCESS Successful completion */
/* NX_CONTINUE Continue processing */
/* NX_OPTION_HEADER_ERROR Error with fragment option */
/* */
/* CALLS */
/* */
/* _nx_ip_dispatch_process Process IPv6 optional headers */
/* NX_ICMPV6_SEND_PARAMETER_PROBLEM Report IPv6 errors via ICMP */
/* message */
/* tx_event_flags_set Wake up the IP helper thread */
/* */
/* CALLED BY */
/* */
/* _nx_ip_dispatch_process Process IPv6 optional header */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Yuxin Zhou Initial Version 6.0 */
/* 09-30-2020 Yuxin Zhou Modified comment(s), improved */
/* packet length verification, */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _nx_ipv6_process_fragment_option(NX_IP *ip_ptr, NX_PACKET *packet_ptr)
{
TX_INTERRUPT_SAVE_AREA
NX_IPV6_HEADER_FRAGMENT_OPTION *fragment_option;
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr);
#ifndef NX_DISABLE_IP_INFO
/* Increment the IP receive fragments count */
ip_ptr -> nx_ip_total_fragments_received++;
#endif /* NX_DISABLE_IP_INFO */
/* If fragmentation is not enabled, we drop this packet. */
if (!ip_ptr -> nx_ip_fragment_assembly)
{
return(NX_OPTION_HEADER_ERROR);
}
/* Check packet length is at least sizeof(NX_IPV6_HEADER_FRAGMENT_OPTION). */
if (packet_ptr -> nx_packet_length < sizeof(NX_IPV6_HEADER_FRAGMENT_OPTION))
{
return(NX_OPTION_HEADER_ERROR);
}
/* Set a pointer to the starting of the fragment option. */
/*lint -e{927} -e{826} suppress cast of pointer to pointer, since it is necessary */
fragment_option = (NX_IPV6_HEADER_FRAGMENT_OPTION *)packet_ptr -> nx_packet_prepend_ptr;
/* Byte swap the offset_flag. The identification field is only used for checking matches.
The absolute value of the Id is not used in arithmatic operations. Therefore there is
need to byte-swap this field. */
NX_CHANGE_USHORT_ENDIAN(fragment_option -> nx_ipv6_header_fragment_option_offset_flag);
/* Check whether or not the payload size is not multiple of 8 bytes if the
M bit is set. */
if (fragment_option -> nx_ipv6_header_fragment_option_offset_flag & 0x0001) /* M bit is set */
{
NX_IPV6_HEADER *ip_header;
ULONG payload_length;
/*lint -e{927} -e{826} suppress cast of pointer to pointer, since it is necessary */
ip_header = (NX_IPV6_HEADER *)packet_ptr -> nx_packet_ip_header;
payload_length = ip_header -> nx_ip_header_word_1 >> 16;
/* If not multiple of 8 bytes... */
if ((payload_length & 0xFFF8) != payload_length)
{
/* Return the option header error status and abort. */
#ifndef NX_DISABLE_ICMPV6_ERROR_MESSAGE
/* Cover offset flag field. */
NX_CHANGE_USHORT_ENDIAN(fragment_option -> nx_ipv6_header_fragment_option_offset_flag);
/*lint -e{835} -e{845} suppress operating on zero. */
NX_ICMPV6_SEND_PARAMETER_PROBLEM(ip_ptr, packet_ptr, 0, 4);
#endif
return(NX_OPTION_HEADER_ERROR);
}
}
/* M bit is clear: This is the last (tail) packet fragment. */
else if ((fragment_option -> nx_ipv6_header_fragment_option_offset_flag & 0xFFF8) == 0)
{
/* Continue processing. */
return(NX_CONTINUE);
}
/* Payload size cannot exceeding 65535. */
if (((fragment_option -> nx_ipv6_header_fragment_option_offset_flag & 0xFFF8) + packet_ptr -> nx_packet_length -
sizeof(NX_IPV6_HEADER_FRAGMENT_OPTION)) > 65535)
{
#ifndef NX_DISABLE_ICMPV6_ERROR_MESSAGE
/* Cover offset flag field. */
NX_CHANGE_USHORT_ENDIAN(fragment_option -> nx_ipv6_header_fragment_option_offset_flag);
/*lint -e{946} -e{947} suppress pointer subtraction, since it is necessary. */
/*lint -e{835} -e{845} suppress operating on zero. */
NX_ICMPV6_SEND_PARAMETER_PROBLEM(ip_ptr, packet_ptr, 0,
(ULONG)((packet_ptr -> nx_packet_prepend_ptr - packet_ptr -> nx_packet_ip_header) + 2));
#endif /* NX_DISABLE_ICMPV6_ERROR_MESSAGE */
/* Return an Option header error status. */
return(NX_OPTION_HEADER_ERROR);
}
/* Disable interrupt */
TX_DISABLE
/* In IPv6 IP fragmentation is required. */
/* Determine if the queue is empty. */
if (ip_ptr -> nx_ip_received_fragment_head)
{
/* Raw receive queue is not empty, add this packet to the end of the queue. */
(ip_ptr -> nx_ip_received_fragment_tail) -> nx_packet_queue_next = packet_ptr;
packet_ptr -> nx_packet_queue_next = NX_NULL;
ip_ptr -> nx_ip_received_fragment_tail = packet_ptr;
}
else
{
/* Raw receive queue is empty. Just set the head and tail pointers
to point to this packet. */
ip_ptr -> nx_ip_received_fragment_head = packet_ptr;
ip_ptr -> nx_ip_received_fragment_tail = packet_ptr;
packet_ptr -> nx_packet_queue_next = NX_NULL;
}
/* Add debug information. */
NX_PACKET_DEBUG(NX_PACKET_IP_FRAGMENT_QUEUE, __LINE__, packet_ptr);
/* Restore interrupts. */
TX_RESTORE
#ifndef NX_FRAGMENT_IMMEDIATE_ASSEMBLY
/* Wakeup IP helper thread to process the IP fragment re-assembly. */
tx_event_flags_set(&(ip_ptr -> nx_ip_events), NX_IP_UNFRAG_EVENT, TX_OR);
#else
/* Process the IP fragment reassemble. */
(ip_ptr -> nx_ip_fragment_assembly)(ip_ptr);
#endif /* NX_FRAGMENT_IMMEDIATE_ASSEMBLY */
return(NX_SUCCESS);
}
#endif /* FEATURE_NX_IPV6 && NX_DISABLE_FRAGMENTATION*/
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