/*
* net/dccp/ccids/ccid2.h
*
* Copyright (c) 2005 Andrea Bittau <a.bittau@cs.ucl.ac.uk>
*
* 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., 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
*
* @{cwnd,ssthresh,pipe}: as per RFC 4341, section 5
* @packets_acked: Ack counter for deriving cwnd growth (RFC 3465)
* @srtt: smoothed RTT estimate, scaled by 2^3
* @mdev: smoothed RTT variation, scaled by 2^2
* @mdev_max: maximum of @mdev during one flight
* @rttvar: moving average/maximum of @mdev_max
* @rto: RTO value deriving from SRTT and RTTVAR (RFC 2988)
* @rtt_seq: to decay RTTVAR at most once per flight
* @rpseq: last consecutive seqno
* @rpdupack: dupacks since rpseq
* @av_chunks: list of Ack Vectors received on current skb
*/
struct ccid2_hc_tx_sock {
u32 cwnd;
u32 ssthresh;
u32 pipe;
u32 packets_acked;
struct ccid2_seq *seqbuf[CCID2_SEQBUF_MAX];
int seqbufc;
struct ccid2_seq *seqh;
struct ccid2_seq *seqt;
/* RTT measurement: variables/principles are the same as in TCP */
u32 srtt,
mdev,
mdev_max,
rttvar,
rto;
u64 rtt_seq:48;
struct timer_list rtotimer;
u64 rpseq;
int rpdupack;
unsigned long last_cong;
u64 high_ack;
struct list_head av_chunks;
};
static inline bool ccid2_cwnd_network_limited(struct ccid2_hc_tx_sock *hctx)
{
return (hctx->pipe >= hctx->cwnd);
}
struct ccid2_hc_rx_sock {
int 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_ */
