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/* packet-tcpcl.h
* References:
* RFC 7242: https://tools.ietf.org/html/rfc7242
* TCPCLv4: https://www.ietf.org/archive/id/draft-ietf-dtn-tcpclv4-28.html
*
* TCPCLv4 portions copyright 2019-2021, Brian Sipos <brian.sipos@gmail.com>
* Copyright 2006-2007 The MITRE Corporation.
* All Rights Reserved.
* Approved for Public Release; Distribution Unlimited.
* Tracking Number 07-0090.
*
* The US Government will not be charged any license fee and/or royalties
* related to this software. Neither name of The MITRE Corporation; nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef PACKET_TCPCL_H
#define PACKET_TCPCL_H
#include <ws_symbol_export.h>
#include <epan/tvbuff.h>
#include <epan/proto.h>
#ifdef __cplusplus
extern "C" {
#endif
/** Extension points for TCPCLv4 are available as:
* For session extension item dissectors, the dissector table
* "tcpcl.v4.sess_ext" has a FT_UINT16 key for registering.
* For transfer extension item dissectors, the dissector table
* "tcpcl.v4.xfer_ext" has a FT_UINT16 key for registering.
* Both have user data dissection context which is obtained with the
* tcpcl_dissect_ctx_get() function.
*/
/* TCP Convergence Layer v3 - Message Types */
typedef enum {
TCPCLV3_TYPE_MASK = 0xf0,
TCPCLV3_DATA_SEGMENT = 0x10,
TCPCLV3_ACK_SEGMENT = 0x20,
TCPCLV3_REFUSE_BUNDLE = 0x30,
TCPCLV3_KEEP_ALIVE = 0x40,
TCPCLV3_SHUTDOWN = 0x50,
TCPCLV3_LENGTH = 0x60,
} Tcpclv3MessageType;
/* TCP Convergence Layer - Contact Header Flags */
typedef enum {
TCPCLV3_BUNDLE_ACK_FLAG = 0x01,
TCPCLV3_REACTIVE_FRAG_FLAG = 0x02,
TCPCLV3_CONNECTOR_RCVR_FLAG = 0x04,
} Tcpclv3ContactFlag;
/* TCP Convergence Layer - Data Segment Flags */
typedef enum {
TCPCLV3_DATA_FLAGS = 0x03,
TCPCLV3_DATA_END_FLAG = 0x01,
TCPCLV3_DATA_START_FLAG = 0x02,
} Tcpclv3DataSegmentFlag;
/* TCP Convergence Layer - Shutdown Segment Flags */
typedef enum {
TCPCLV3_SHUTDOWN_FLAGS = 0x03,
TCPCLV3_SHUTDOWN_REASON = 0x02,
TCPCLV3_SHUTDOWN_DELAY = 0x01,
} Tcpclv3ShutdownFlag;
/* REFUSE-BUNDLE Reason-Codes */
typedef enum {
TCPCLV3_REFUSE_REASON_UNKNOWN = 0x00,
TCPCLV3_REFUSE_REASON_RX_COMPLETE = 0x01,
TCPCLV3_REFUSE_REASON_RX_EXHAUSTED = 0x02,
TCPCLV3_REFUSE_REASON_RX_RETRANSMIT = 0x03,
/* 0x4-0x7 - Unassigned
* 0x8-0xf - Reserved for future Use */
} Tcpclv3RefuseType;
typedef enum {
TCPCLV4_MSGTYPE_INVALID = 0x00,
TCPCLV4_MSGTYPE_XFER_SEGMENT = 0x01,
TCPCLV4_MSGTYPE_XFER_ACK = 0x02,
TCPCLV4_MSGTYPE_XFER_REFUSE = 0x03,
TCPCLV4_MSGTYPE_KEEPALIVE = 0x04,
TCPCLV4_MSGTYPE_SESS_TERM = 0x05,
TCPCLV4_MSGTYPE_MSG_REJECT = 0x06,
TCPCLV4_MSGTYPE_SESS_INIT = 0x07,
} Tcpclv4MessageType;
typedef enum {
TCPCLV4_SESSEXT_INVALID = 0x00,
} Tcpclv4SessExtenionType;
typedef enum {
TCPCLV4_XFEREXT_INVALID = 0x00,
TCPCLV4_XFEREXT_TRANSFER_LEN = 0x01,
} Tcpclv4XferExtenionType;
typedef enum {
TCPCLV4_CONTACT_FLAG_CANTLS = 0x01,
} Tcpclv4ContactFlag;
typedef enum {
TCPCLV4_SESS_TERM_FLAG_REPLY = 0x01,
} Tcpclv4SessTermFlag;
typedef enum {
TCPCLV4_TRANSFER_FLAG_START = 0x02,
TCPCLV4_TRANSFER_FLAG_END = 0x01,
} Tcpclv4TransferFlag;
typedef enum {
TCPCLV4_EXTENSION_FLAG_CRITICAL = 0x01,
} Tcpclv4ExtensionFlag;
/// Finer grained locating than just the frame number
typedef struct {
/// Index of the frame
guint32 frame_num;
/// Source index within the frame
gint src_ix;
/// Offset within the source TVB
gint raw_offset;
} tcpcl_frame_loc_t;
typedef struct {
/// Ordered list of seg_meta_t* for XFER_SEGMENT as seen in the first scan.
wmem_list_t *seg_list;
/// Ordered list of ack_meta_t* for XFER_ACK as seen in the first scan.
wmem_list_t *ack_list;
/// Optional Transfer Length extension
guint64 *total_length;
} tcpcl_transfer_t;
typedef struct {
/// Address for this peer
address addr;
/// Port for the this peer
guint32 port;
/// Frame number in which the contact header starts
tcpcl_frame_loc_t *chdr_seen;
/// TCPCL version seen from this peer
guint8 version;
/// CAN_TLS flag from the contact header
gboolean can_tls;
/// Frame number in which the v4 SESS_INIT message starts
tcpcl_frame_loc_t *sess_init_seen;
/// Keepalive duration (s) from v4 SESS_INIT
guint16 keepalive;
/// Segment MRU
guint64 segment_mru;
/// Transfer MRU
guint64 transfer_mru;
/// Frame number in which the SESS_TERM message starts
tcpcl_frame_loc_t *sess_term_seen;
/// SESS_TERM reason
guint8 sess_term_reason;
/// Map from tcpcl_frame_loc_t* to possible associated transfer ID guint64*
wmem_map_t *frame_loc_to_transfer;
/// Map from transfer ID guint64* to tcpcl_transfer_t* sent from this peer
wmem_map_t *transfers;
} tcpcl_peer_t;
/// Persistent state associated with a TCP conversation
typedef struct {
/// Information for the active side of the session
tcpcl_peer_t *active;
/// Information for the passive side of the session
tcpcl_peer_t *passive;
/// Set to the first TCPCL version seen.
/// Used later for validity check.
guint8 *version;
/// True when contact negotiation is finished
gboolean contact_negotiated;
/// Negotiated use of TLS from @c can_tls of the peers
gboolean session_use_tls;
/// The last frame before TLS handshake
tcpcl_frame_loc_t *session_tls_start;
/// True when session negotiation is finished
gboolean sess_negotiated;
/// Negotiated session keepalive
guint16 sess_keepalive;
} tcpcl_conversation_t;
/// Context for a single packet dissection
typedef struct {
tcpcl_conversation_t *convo;
/// Dissection cursor
tcpcl_frame_loc_t *cur_loc;
/// True if the dissection is on a contact header
gboolean is_contact;
/// The sending peer
tcpcl_peer_t *tx_peer;
/// The receiving peer
tcpcl_peer_t *rx_peer;
/// Possible transfer payload
tvbuff_t *xferload;
} tcpcl_dissect_ctx_t;
/** Initialize members of the dissection context.
*
* @param pinfo Packet info for the frame.
* @param tvb The buffer dissected.
* @param offset The start offset.
* @return ctx The new packet context.
*/
WS_DLL_PUBLIC
tcpcl_dissect_ctx_t * tcpcl_dissect_ctx_get(tvbuff_t *tvb, packet_info *pinfo, const gint offset);
#ifdef __cplusplus
}
#endif
#endif /* PACKET_TCPCL_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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