100 lines
2.7 KiB
C
100 lines
2.7 KiB
C
/*
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* net/dccp/ccids/ccid2.h
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*
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* Copyright (c) 2005 Andrea Bittau <a.bittau@cs.ucl.ac.uk>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef _DCCP_CCID2_H_
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#define _DCCP_CCID2_H_
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#include <linux/dccp.h>
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#include <linux/timer.h>
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#include <linux/types.h>
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#include "../ccid.h"
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/* NUMDUPACK parameter from RFC 4341, p. 6 */
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#define NUMDUPACK 3
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struct sock;
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struct ccid2_seq {
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u64 ccid2s_seq;
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unsigned long ccid2s_sent;
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int ccid2s_acked;
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struct ccid2_seq *ccid2s_prev;
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struct ccid2_seq *ccid2s_next;
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};
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#define CCID2_SEQBUF_LEN 1024
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#define CCID2_SEQBUF_MAX 128
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/** struct ccid2_hc_tx_sock - CCID2 TX half connection
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*
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* @{cwnd,ssthresh,pipe}: as per RFC 4341, section 5
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* @packets_acked: Ack counter for deriving cwnd growth (RFC 3465)
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* @srtt: smoothed RTT estimate, scaled by 2^3
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* @mdev: smoothed RTT variation, scaled by 2^2
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* @mdev_max: maximum of @mdev during one flight
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* @rttvar: moving average/maximum of @mdev_max
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* @rto: RTO value deriving from SRTT and RTTVAR (RFC 2988)
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* @rtt_seq: to decay RTTVAR at most once per flight
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* @rpseq: last consecutive seqno
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* @rpdupack: dupacks since rpseq
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* @av_chunks: list of Ack Vectors received on current skb
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*/
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struct ccid2_hc_tx_sock {
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u32 cwnd;
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u32 ssthresh;
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u32 pipe;
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u32 packets_acked;
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struct ccid2_seq *seqbuf[CCID2_SEQBUF_MAX];
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int seqbufc;
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struct ccid2_seq *seqh;
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struct ccid2_seq *seqt;
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/* RTT measurement: variables/principles are the same as in TCP */
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u32 srtt,
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mdev,
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mdev_max,
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rttvar,
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rto;
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u64 rtt_seq:48;
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struct timer_list rtotimer;
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u64 rpseq;
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int rpdupack;
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unsigned long last_cong;
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u64 high_ack;
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struct list_head av_chunks;
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};
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static inline bool ccid2_cwnd_network_limited(struct ccid2_hc_tx_sock *hctx)
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{
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return (hctx->pipe >= hctx->cwnd);
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}
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struct ccid2_hc_rx_sock {
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int data;
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};
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static inline struct ccid2_hc_tx_sock *ccid2_hc_tx_sk(const struct sock *sk)
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{
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return ccid_priv(dccp_sk(sk)->dccps_hc_tx_ccid);
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}
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static inline struct ccid2_hc_rx_sock *ccid2_hc_rx_sk(const struct sock *sk)
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{
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return ccid_priv(dccp_sk(sk)->dccps_hc_rx_ccid);
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}
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#endif /* _DCCP_CCID2_H_ */
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