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/*
This file is part of GNUnet.
Copyright (C) 2013, 2014 Christian Grothoff (and other contributing authors)
GNUnet 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 3, or (at your
option) any later version.
GNUnet 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 GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
/**
* @author Florian Dold
* @author Christian Grothoff
* @file set/gnunet-service-set_protocol.h
* @brief Peer-to-Peer messages for gnunet set
*/
#ifndef SET_PROTOCOL_H
#define SET_PROTOCOL_H
#include "platform.h"
#include "gnunet_common.h"
GNUNET_NETWORK_STRUCT_BEGIN
struct OperationRequestMessage
{
/**
* Type: #GNUNET_MESSAGE_TYPE_SET_P2P_OPERATION_REQUEST
*/
struct GNUNET_MessageHeader header;
/**
* Operation to request, values from `enum GNUNET_SET_OperationType`
*/
uint32_t operation GNUNET_PACKED;
/**
* For Intersection: my element count
*/
uint32_t element_count GNUNET_PACKED;
/**
* Application-specific identifier of the request.
*/
struct GNUNET_HashCode app_id;
/* rest: optional message */
};
/**
* Message containing buckets of an invertible bloom filter.
*
* If an IBF has too many buckets for an IBF message,
* it is split into multiple messages.
*/
struct IBFMessage
{
/**
* Type: #GNUNET_MESSAGE_TYPE_SET_UNION_P2P_IBF
*/
struct GNUNET_MessageHeader header;
/**
* Order of the whole ibf, where
* num_buckets = 2^order
*/
uint8_t order;
/**
* Padding, must be 0.
*/
uint8_t reserved;
/**
* Offset of the strata in the rest of the message
*/
uint16_t offset GNUNET_PACKED;
/**
* Salt used when hashing elements for this IBF.
*/
uint32_t salt GNUNET_PACKED;
/* rest: buckets */
};
struct InquiryMessage
{
/**
* Type: #GNUNET_MESSAGE_TYPE_SET_UNION_P2P_IBF
*/
struct GNUNET_MessageHeader header;
/**
* Salt used when hashing elements for this inquiry.
*/
uint32_t salt GNUNET_PACKED;
/**
* Reserved, set to 0.
*/
uint32_t reserved GNUNET_PACKED;
/* rest: inquiry IBF keys */
};
/**
* During intersection, the first (and possibly second) message
* send it the number of elements in the set, to allow the peers
* to decide who should start with the Bloom filter.
*/
struct IntersectionElementInfoMessage
{
/**
* Type: #GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_ELEMENT_INFO
*/
struct GNUNET_MessageHeader header;
/**
* mutator used with this bloomfilter.
*/
uint32_t sender_element_count GNUNET_PACKED;
};
/**
* Bloom filter messages exchanged for set intersection calculation.
*/
struct BFMessage
{
/**
* Type: #GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_BF
*/
struct GNUNET_MessageHeader header;
/**
* Number of elements the sender still has in the set.
*/
uint32_t sender_element_count GNUNET_PACKED;
/**
* XOR of all hashes over all elements remaining in the set.
* Used to determine termination.
*/
struct GNUNET_HashCode element_xor_hash;
/**
* Mutator used with this bloomfilter.
*/
uint32_t sender_mutator GNUNET_PACKED;
/**
* Total length of the bloomfilter data.
*/
uint32_t bloomfilter_total_length GNUNET_PACKED;
/**
* Number of bits (k-value) used in encoding the bloomfilter.
*/
uint32_t bits_per_element GNUNET_PACKED;
/**
* rest: the sender's bloomfilter
*/
};
/**
* Last message, send to confirm the final set. Contains the element
* count as it is possible that the peer determined that we were done
* by getting the empty set, which in that case also needs to be
* communicated.
*/
struct IntersectionDoneMessage
{
/**
* Type: #GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_DONE
*/
struct GNUNET_MessageHeader header;
/**
* Final number of elements in intersection.
*/
uint32_t final_element_count GNUNET_PACKED;
/**
* XOR of all hashes over all elements remaining in the set.
*/
struct GNUNET_HashCode element_xor_hash;
};
GNUNET_NETWORK_STRUCT_END
#endif
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