ipv6_frag.h File Reference

IPv6 fragmentation and reassembly. More...

#include "core/net.h"
#include "ipv6/ipv6.h"

Go to the source code of this file.

Data Structures

struct  Ipv6ReassemblyBuffer
 Reassembly buffer. More...
 
struct  Ipv6FragDesc
 Fragmented packet descriptor. More...
 

Macros

#define IPV6_FRAG_SUPPORT   ENABLED
 
#define IPV6_OVERLAPPING_FRAG_SUPPORT   DISABLED
 
#define IPV6_FRAG_TICK_INTERVAL   1000
 
#define IPV6_MAX_FRAG_DATAGRAMS   4
 
#define IPV6_MAX_FRAG_DATAGRAM_SIZE   8192
 
#define IPV6_FRAG_TIME_TO_LIVE   15000
 
#define IPV6_INFINITY   0xFFFF
 

Functions

error_t ipv6FragmentDatagram (NetInterface *interface, const Ipv6PseudoHeader *pseudoHeader, const NetBuffer *payload, size_t payloadOffset, size_t pathMtu, NetTxAncillary *ancillary)
 Fragment IPv6 datagram into smaller packets. More...
 
void ipv6ParseFragmentHeader (NetInterface *interface, const NetBuffer *ipPacket, size_t ipPacketOffset, size_t fragHeaderOffset, size_t nextHeaderOffset, NetRxAncillary *ancillary)
 Parse Fragment header and reassemble original datagram. More...
 
void ipv6FragTick (NetInterface *interface)
 Fragment reassembly timeout handler. More...
 
Ipv6FragDescipv6SearchFragQueue (NetInterface *interface, const Ipv6Header *packet, const Ipv6FragmentHeader *header)
 Search for a matching datagram in the reassembly queue. More...
 
void ipv6FlushFragQueue (NetInterface *interface)
 Flush IPv6 reassembly queue. More...
 
Ipv6HoleDescipv6FindHole (Ipv6FragDesc *frag, uint16_t offset)
 Retrieve hole descriptor. More...
 
void ipv6DumpHoleList (Ipv6FragDesc *frag)
 Dump hole descriptor list. More...
 

Variables

typedef __packed_struct
 Hole descriptor. More...
 
uint16_t last
 
uint16_t next
 
 Ipv6HoleDesc
 
systime_t ipv6FragTickCounter
 

Detailed Description

IPv6 fragmentation and reassembly.

License

SPDX-License-Identifier: GPL-2.0-or-later

Copyright (C) 2010-2024 Oryx Embedded SARL. All rights reserved.

This file is part of CycloneTCP Open.

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

Author
Oryx Embedded SARL (www.oryx-embedded.com)
Version
2.4.4

Definition in file ipv6_frag.h.

Macro Definition Documentation

◆ IPV6_FRAG_SUPPORT

#define IPV6_FRAG_SUPPORT   ENABLED

Definition at line 40 of file ipv6_frag.h.

◆ IPV6_FRAG_TICK_INTERVAL

#define IPV6_FRAG_TICK_INTERVAL   1000

Definition at line 54 of file ipv6_frag.h.

◆ IPV6_FRAG_TIME_TO_LIVE

#define IPV6_FRAG_TIME_TO_LIVE   15000

Definition at line 76 of file ipv6_frag.h.

◆ IPV6_INFINITY

#define IPV6_INFINITY   0xFFFF

Definition at line 82 of file ipv6_frag.h.

◆ IPV6_MAX_FRAG_DATAGRAM_SIZE

#define IPV6_MAX_FRAG_DATAGRAM_SIZE   8192

Definition at line 69 of file ipv6_frag.h.

◆ IPV6_MAX_FRAG_DATAGRAMS

#define IPV6_MAX_FRAG_DATAGRAMS   4

Definition at line 62 of file ipv6_frag.h.

◆ IPV6_OVERLAPPING_FRAG_SUPPORT

#define IPV6_OVERLAPPING_FRAG_SUPPORT   DISABLED

Definition at line 47 of file ipv6_frag.h.

Function Documentation

◆ ipv6DumpHoleList()

void ipv6DumpHoleList ( Ipv6FragDesc frag)

Dump hole descriptor list.

Parameters
[in]fragIPv6 fragment descriptor

Definition at line 756 of file ipv6_frag.c.

◆ ipv6FindHole()

Ipv6HoleDesc* ipv6FindHole ( Ipv6FragDesc frag,
uint16_t  offset 
)

Retrieve hole descriptor.

Parameters
[in]fragIPv6 fragment descriptor
[in]offsetOffset of the hole
Returns
A pointer to the hole descriptor is returned if the specified offset is valid. Otherwise NULL is returned

Definition at line 744 of file ipv6_frag.c.

◆ ipv6FlushFragQueue()

void ipv6FlushFragQueue ( NetInterface interface)

Flush IPv6 reassembly queue.

Parameters
[in]interfaceUnderlying network interface

Definition at line 723 of file ipv6_frag.c.

◆ ipv6FragmentDatagram()

error_t ipv6FragmentDatagram ( NetInterface interface,
const Ipv6PseudoHeader pseudoHeader,
const NetBuffer payload,
size_t  payloadOffset,
size_t  pathMtu,
NetTxAncillary ancillary 
)

Fragment IPv6 datagram into smaller packets.

Parameters
[in]interfaceUnderlying network interface
[in]pseudoHeaderIPv6 pseudo header
[in]payloadMulti-part buffer containing the payload
[in]payloadOffsetOffset to the first payload byte
[in]pathMtuPMTU value
[in]ancillaryAdditional options passed to the stack along with the packet
Returns
Error code

Definition at line 62 of file ipv6_frag.c.

◆ ipv6FragTick()

void ipv6FragTick ( NetInterface interface)

Fragment reassembly timeout handler.

This routine must be periodically called by the TCP/IP stack to handle IPv6 fragment reassembly timeout

Parameters
[in]interfaceUnderlying network interface

Definition at line 550 of file ipv6_frag.c.

◆ ipv6ParseFragmentHeader()

void ipv6ParseFragmentHeader ( NetInterface interface,
const NetBuffer ipPacket,
size_t  ipPacketOffset,
size_t  fragHeaderOffset,
size_t  nextHeaderOffset,
NetRxAncillary ancillary 
)

Parse Fragment header and reassemble original datagram.

Parameters
[in]interfaceUnderlying network interface
[in]ipPacketMulti-part buffer containing the incoming IPv6 packet
[in]ipPacketOffsetOffset to the first byte of the IPv6 packet
[in]fragHeaderOffsetOffset to the Fragment header
[in]nextHeaderOffsetOffset to the Next Header field of the previous header
[in]ancillaryAdditional options passed to the stack along with the packet

Definition at line 179 of file ipv6_frag.c.

◆ ipv6SearchFragQueue()

Ipv6FragDesc* ipv6SearchFragQueue ( NetInterface interface,
const Ipv6Header packet,
const Ipv6FragmentHeader header 
)

Search for a matching datagram in the reassembly queue.

Parameters
[in]interfaceUnderlying network interface
[in]packetIncoming IPv6 packet
[in]headerPointer to the Fragment header
Returns
Matching fragment descriptor

Definition at line 619 of file ipv6_frag.c.

Variable Documentation

◆ __packed_struct

typedef __packed_struct
Initial value:
{
uint16_t first

Hole descriptor.

Definition at line 102 of file ipv6_frag.h.

◆ ipv6FragTickCounter

systime_t ipv6FragTickCounter
extern

Definition at line 47 of file ipv6_frag.c.

◆ Ipv6HoleDesc

Ipv6HoleDesc

Definition at line 107 of file ipv6_frag.h.

◆ last

uint16_t last

Definition at line 105 of file ipv6_frag.h.

◆ next

uint16_t next

Definition at line 106 of file ipv6_frag.h.