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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_ipv6.h"
#include "nx_icmpv6.h"
#ifdef FEATURE_NX_IPV6
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_ipv6_process_hop_by_hop_option PORTABLE C */
/* 6.1.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function processes the Hop by Hop and the Destination headers. */
/* */
/* INPUT */
/* */
/* ip_ptr Pointer to IP control block */
/* packet_ptr Pointer to packet to process */
/* */
/* OUTPUT */
/* */
/* NX_SUCCESS Successful completion */
/* NX_OPTION_HEADER_ERROR Error parsing packet options */
/* */
/* CALLS */
/* */
/* _nx_ipv6_option_error Handle errors in IPv6 option */
/* */
/* */
/* CALLED BY */
/* */
/* _nx_ipv6_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), */
/* resulting in version 6.1 */
/* 12-31-2020 Yuxin Zhou Modified comment(s), improved */
/* buffer read overflow check, */
/* resulting in version 6.1.3 */
/* */
/**************************************************************************/
UINT _nx_ipv6_process_hop_by_hop_option(NX_IP *ip_ptr, NX_PACKET *packet_ptr)
{
INT header_length;
UINT offset_base, offset;
UINT rv;
NX_IPV6_HOP_BY_HOP_OPTION *option;
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr);
/* Make sure there's no OOB when reading Hdr Ext Len from the packet buffer. */
if ((UINT)(packet_ptr -> nx_packet_append_ptr - packet_ptr -> nx_packet_prepend_ptr) < 2)
{
/* return an error code. */
return(NX_OPTION_HEADER_ERROR);
}
/* Read the Hdr Ext Len field. */
header_length = *(packet_ptr -> nx_packet_prepend_ptr + 1);
/* Calculate the the true header length: (n + 1) * 8 */
header_length = (header_length + 1) << 3;
/* The 1st option starts from the 3rd byte. */
offset = 2;
/*lint -e{946} -e{947} suppress pointer subtraction, since it is necessary. */
/*lint -e{737} suppress loss of sign, since nx_packet_append_ptr is assumed to be larger than nx_packet_ip_header. */
offset_base = (UINT)((ULONG)(packet_ptr -> nx_packet_prepend_ptr - packet_ptr -> nx_packet_ip_header) - (ULONG)sizeof(NX_IPV6_HEADER));
header_length = header_length - (INT)offset;
/* Sanity check; does the header length data go past the end of the end of the packet buffer? */
/*lint -e{946} -e{947} suppress pointer subtraction, since it is necessary. */
if ((UINT)(packet_ptr -> nx_packet_append_ptr - packet_ptr -> nx_packet_prepend_ptr) <
((UINT)header_length + offset))
{
/* Yes, handle the error as indicated by the option type 2 msb's. */
/*lint -e{927} -e{826} suppress cast of pointer to pointer, since it is necessary */
option = (NX_IPV6_HOP_BY_HOP_OPTION *)(packet_ptr -> nx_packet_prepend_ptr + offset);
_nx_ipv6_option_error(ip_ptr, packet_ptr, option -> nx_ipv6_hop_by_hop_option_type, offset_base + offset);
return(NX_OPTION_HEADER_ERROR);
}
while (header_length > 0)
{
/* Get a pointer to the options. */
/*lint -e{927} -e{826} suppress cast of pointer to pointer, since it is necessary */
option = (NX_IPV6_HOP_BY_HOP_OPTION *)(packet_ptr -> nx_packet_prepend_ptr + offset);
switch (option -> nx_ipv6_hop_by_hop_option_type)
{
case 0:
/* Pad1 option. This option indicates the size of the padding is one.
So we skip one byte. */
offset++;
header_length--;
break;
case 1:
/* PadN option. Skip N+2 bytes. */
offset += ((UINT)(option -> nx_ipv6_hop_by_hop_length) + 2);
header_length -= ((INT)(option -> nx_ipv6_hop_by_hop_length) + 2);
break;
#ifdef NX_ENABLE_THREAD
case 109:
/* RFC 7731. */
/* Skip N+2 bytes. */
offset += ((UINT)(option -> nx_ipv6_hop_by_hop_length) + 2);
header_length -= ((INT)(option -> nx_ipv6_hop_by_hop_length) + 2);
break;
#endif /* NX_ENABLE_THREAD */
default:
/* Unknown option. */
rv = _nx_ipv6_option_error(ip_ptr, packet_ptr, option -> nx_ipv6_hop_by_hop_option_type, offset_base + offset);
/* If no errors, just skip this option and move onto the next option.*/
if (rv == NX_SUCCESS)
{
/* Skip this option and continue processing the rest of the header. */
offset += ((UINT)(option -> nx_ipv6_hop_by_hop_length) + 2);
header_length -= ((INT)(option -> nx_ipv6_hop_by_hop_length) + 2);
break;
}
else
{
/* Return value indicates an error status: we need to drop the entire packet. */
return(rv); /* Drop this packet. */
}
}
}
/* Successful processing of option header. */
return(NX_SUCCESS);
}
#endif /* FEATURE_NX_IPV6 */
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