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* Copyright (c) 2005 Andrea Bittau <>
* 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
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
#ifndef _DCCP_CCID2_H_
#define _DCCP_CCID2_H_
#include <linux/dccp.h>
#include <linux/timer.h>
#include <linux/types.h>
#include "../ccid.h"
/* NUMDUPACK parameter from RFC 4341, p. 6 */
#define NUMDUPACK 3
struct sock;
struct ccid2_seq {
u64 ccid2s_seq;
unsigned long ccid2s_sent;
int ccid2s_acked;
struct ccid2_seq *ccid2s_prev;
struct ccid2_seq *ccid2s_next;
#define CCID2_SEQBUF_LEN 1024
#define CCID2_SEQBUF_MAX 128
* struct ccid2_hc_tx_sock - CCID2 TX half connection
* @tx_{cwnd,ssthresh,pipe}: as per RFC 4341, section 5
* @tx_packets_acked: Ack counter for deriving cwnd growth (RFC 3465)
* @tx_lastrtt: time RTT was last measured
* @tx_rpseq: last consecutive seqno
* @tx_rpdupack: dupacks since rpseq
struct ccid2_hc_tx_sock {
u32 tx_cwnd;
u32 tx_ssthresh;
u32 tx_pipe;
u32 tx_packets_acked;
struct ccid2_seq *tx_seqbuf[CCID2_SEQBUF_MAX];
int tx_seqbufc;
struct ccid2_seq *tx_seqh;
struct ccid2_seq *tx_seqt;
long tx_rto;
long tx_srtt;
long tx_rttvar;
unsigned long tx_lastrtt;
struct timer_list tx_rtotimer;
u64 tx_rpseq;
int tx_rpdupack;
unsigned long tx_last_cong;
u64 tx_high_ack;
struct ccid2_hc_rx_sock {
int rx_data;
static inline struct ccid2_hc_tx_sock *ccid2_hc_tx_sk(const struct sock *sk)
return ccid_priv(dccp_sk(sk)->dccps_hc_tx_ccid);
static inline struct ccid2_hc_rx_sock *ccid2_hc_rx_sk(const struct sock *sk)
return ccid_priv(dccp_sk(sk)->dccps_hc_rx_ccid);
#endif /* _DCCP_CCID2_H_ */