/* SPDX-License-Identifier: GPL-2.0-or-later */
|
/*
|
* Copyright (c) 2005 Andrea Bittau <a.bittau@cs.ucl.ac.uk>
|
*/
|
#ifndef _DCCP_CCID2_H_
|
#define _DCCP_CCID2_H_
|
|
#include <linux/timer.h>
|
#include <linux/types.h>
|
#include "../ccid.h"
|
#include "../dccp.h"
|
|
/*
|
* CCID-2 timestamping faces the same issues as TCP timestamping.
|
* Hence we reuse/share as much of the code as possible.
|
*/
|
#define ccid2_jiffies32 ((u32)jiffies)
|
|
/* NUMDUPACK parameter from RFC 4341, p. 6 */
|
#define NUMDUPACK 3
|
|
struct ccid2_seq {
|
u64 ccid2s_seq;
|
u32 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
|
|
/*
|
* Multiple of congestion window to keep the sequence window at
|
* (RFC 4340 7.5.2)
|
*/
|
#define CCID2_WIN_CHANGE_FACTOR 5
|
|
/**
|
* 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_srtt: smoothed RTT estimate, scaled by 2^3
|
* @tx_mdev: smoothed RTT variation, scaled by 2^2
|
* @tx_mdev_max: maximum of @mdev during one flight
|
* @tx_rttvar: moving average/maximum of @mdev_max
|
* @tx_rto: RTO value deriving from SRTT and RTTVAR (RFC 2988)
|
* @tx_rtt_seq: to decay RTTVAR at most once per flight
|
* @tx_cwnd_used: actually used cwnd, W_used of RFC 2861
|
* @tx_expected_wnd: moving average of @tx_cwnd_used
|
* @tx_cwnd_stamp: to track idle periods in CWV
|
* @tx_lsndtime: last time (in jiffies) a data packet was sent
|
* @tx_rpseq: last consecutive seqno
|
* @tx_rpdupack: dupacks since rpseq
|
* @tx_av_chunks: list of Ack Vectors received on current skb
|
*/
|
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;
|
|
/* RTT measurement: variables/principles are the same as in TCP */
|
u32 tx_srtt,
|
tx_mdev,
|
tx_mdev_max,
|
tx_rttvar,
|
tx_rto;
|
u64 tx_rtt_seq:48;
|
struct timer_list tx_rtotimer;
|
struct sock *sk;
|
|
/* Congestion Window validation (optional, RFC 2861) */
|
u32 tx_cwnd_used,
|
tx_expected_wnd,
|
tx_cwnd_stamp,
|
tx_lsndtime;
|
|
u64 tx_rpseq;
|
int tx_rpdupack;
|
u32 tx_last_cong;
|
u64 tx_high_ack;
|
struct list_head tx_av_chunks;
|
};
|
|
static inline bool ccid2_cwnd_network_limited(struct ccid2_hc_tx_sock *hc)
|
{
|
return hc->tx_pipe >= hc->tx_cwnd;
|
}
|
|
/*
|
* Convert RFC 3390 larger initial window into an equivalent number of packets.
|
* This is based on the numbers specified in RFC 5681, 3.1.
|
*/
|
static inline u32 rfc3390_bytes_to_packets(const u32 smss)
|
{
|
return smss <= 1095 ? 4 : (smss > 2190 ? 2 : 3);
|
}
|
|
/**
|
* struct ccid2_hc_rx_sock - Receiving end of CCID-2 half-connection
|
* @rx_num_data_pkts: number of data packets received since last feedback
|
*/
|
struct ccid2_hc_rx_sock {
|
u32 rx_num_data_pkts;
|
};
|
|
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_ */
|
