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/* packet-dccp.h
* Definitions for Datagram Congestion Control Protocol, "DCCP" dissection:
* it should conform to RFC 4340
*
* Copyright 2005 _FF_
*
* Francesco Fondelli <francesco dot fondelli, gmail dot com>
*
* Copyright 2020-2021 by Thomas Dreibholz <dreibh [AT] simula.no>
*
* template taken from packet-udp.c
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef __PACKET_DCCP_H__
#define __PACKET_DCCP_H__
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/* DCCP structs and definitions */
typedef struct _e_dccphdr {
uint16_t sport;
uint16_t dport;
uint8_t data_offset;
uint8_t cscov; /* 4 bits */
uint8_t ccval; /* 4 bits */
uint16_t checksum;
uint8_t reserved1; /* 3 bits */
uint8_t type; /* 4 bits */
bool x; /* 1 bits */
uint8_t reserved2; /* if x == 1 */
uint64_t seq; /* 48 or 24 bits sequence number */
uint16_t ack_reserved; /*
* for all defined packet types except DCCP-Request
* and DCCP-Data
*/
uint64_t ack; /* 48 or 24 bits acknowledgement sequence number */
uint32_t service_code;
uint8_t reset_code;
uint8_t data1;
uint8_t data2;
uint8_t data3;
uint32_t stream; /* this stream index field is included to help differentiate when address/port pairs are reused */
address ip_src;
address ip_dst;
} e_dccphdr;
typedef struct _dccp_flow_t {
uint8_t static_flags; /* flags */
uint64_t base_seq; /* base seq number (used by relative sequence numbers) */
} dccp_flow_t;
struct dccp_analysis {
/* These two structs are managed based on comparing the source
* and destination addresses and, if they're equal, comparing
* the source and destination ports.
*
* If the source is greater than the destination, then stuff
* sent from src is in ual1.
*
* If the source is less than the destination, then stuff
* sent from src is in ual2.
*
* XXX - if the addresses and ports are equal, we don't guarantee
* the behavior.
*/
dccp_flow_t flow1;
dccp_flow_t flow2;
/* These pointers are set by get_dccp_conversation_data()
* fwd point in the same direction as the current packet
* and rev in the reverse direction
*/
dccp_flow_t *fwd;
dccp_flow_t *rev;
/* Keep track of dccp stream numbers instead of using the conversation
* index (as how it was done before). This prevents gaps in the
* stream index numbering
*/
uint32_t stream;
/* Remember the timestamp of the first frame seen in this dccp
* conversation to be able to calculate a relative time compared
* to the start of this conversation
*/
nstime_t ts_first;
/* Remember the timestamp of the frame that was last seen in this
* dccp conversation to be able to calculate a delta time compared
* to previous frame in this conversation
*/
nstime_t ts_prev;
};
/** Get the current number of DCCP streams
*
* @return The number of DCCP streams
*/
WS_DLL_PUBLIC uint32_t get_dccp_stream_count(void);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __PACKET_DCCP_H__ */
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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