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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Copyright (c) 2005 Andrea Bittau <a.bittau@cs.ucl.ac.uk>
4 */
5#ifndef _DCCP_CCID2_H_
6#define _DCCP_CCID2_H_
7
8#include <linux/timer.h>
9#include <linux/types.h>
10#include "../ccid.h"
11#include "../dccp.h"
12
13/*
14 * CCID-2 timestamping faces the same issues as TCP timestamping.
15 * Hence we reuse/share as much of the code as possible.
16 */
17#define ccid2_jiffies32 ((u32)jiffies)
18
19/* NUMDUPACK parameter from RFC 4341, p. 6 */
20#define NUMDUPACK 3
21
22struct ccid2_seq {
23 u64 ccid2s_seq;
24 u32 ccid2s_sent;
25 int ccid2s_acked;
26 struct ccid2_seq *ccid2s_prev;
27 struct ccid2_seq *ccid2s_next;
28};
29
30#define CCID2_SEQBUF_LEN 1024
31#define CCID2_SEQBUF_MAX 128
32
33/*
34 * Multiple of congestion window to keep the sequence window at
35 * (RFC 4340 7.5.2)
36 */
37#define CCID2_WIN_CHANGE_FACTOR 5
38
39/**
40 * struct ccid2_hc_tx_sock - CCID2 TX half connection
41 * @tx_{cwnd,ssthresh,pipe}: as per RFC 4341, section 5
42 * @tx_packets_acked: Ack counter for deriving cwnd growth (RFC 3465)
43 * @tx_srtt: smoothed RTT estimate, scaled by 2^3
44 * @tx_mdev: smoothed RTT variation, scaled by 2^2
45 * @tx_mdev_max: maximum of @mdev during one flight
46 * @tx_rttvar: moving average/maximum of @mdev_max
47 * @tx_rto: RTO value deriving from SRTT and RTTVAR (RFC 2988)
48 * @tx_rtt_seq: to decay RTTVAR at most once per flight
49 * @tx_cwnd_used: actually used cwnd, W_used of RFC 2861
50 * @tx_expected_wnd: moving average of @tx_cwnd_used
51 * @tx_cwnd_stamp: to track idle periods in CWV
52 * @tx_lsndtime: last time (in jiffies) a data packet was sent
53 * @tx_rpseq: last consecutive seqno
54 * @tx_rpdupack: dupacks since rpseq
55 * @tx_av_chunks: list of Ack Vectors received on current skb
56 */
57struct ccid2_hc_tx_sock {
58 u32 tx_cwnd;
59 u32 tx_ssthresh;
60 u32 tx_pipe;
61 u32 tx_packets_acked;
62 struct ccid2_seq *tx_seqbuf[CCID2_SEQBUF_MAX];
63 int tx_seqbufc;
64 struct ccid2_seq *tx_seqh;
65 struct ccid2_seq *tx_seqt;
66
67 /* RTT measurement: variables/principles are the same as in TCP */
68 u32 tx_srtt,
69 tx_mdev,
70 tx_mdev_max,
71 tx_rttvar,
72 tx_rto;
73 u64 tx_rtt_seq:48;
74 struct timer_list tx_rtotimer;
75 struct sock *sk;
76
77 /* Congestion Window validation (optional, RFC 2861) */
78 u32 tx_cwnd_used,
79 tx_expected_wnd,
80 tx_cwnd_stamp,
81 tx_lsndtime;
82
83 u64 tx_rpseq;
84 int tx_rpdupack;
85 u32 tx_last_cong;
86 u64 tx_high_ack;
87 struct list_head tx_av_chunks;
88};
89
90static inline bool ccid2_cwnd_network_limited(struct ccid2_hc_tx_sock *hc)
91{
92 return hc->tx_pipe >= hc->tx_cwnd;
93}
94
95/*
96 * Convert RFC 3390 larger initial window into an equivalent number of packets.
97 * This is based on the numbers specified in RFC 5681, 3.1.
98 */
99static inline u32 rfc3390_bytes_to_packets(const u32 smss)
100{
101 return smss <= 1095 ? 4 : (smss > 2190 ? 2 : 3);
102}
103
104/**
105 * struct ccid2_hc_rx_sock - Receiving end of CCID-2 half-connection
106 * @rx_num_data_pkts: number of data packets received since last feedback
107 */
108struct ccid2_hc_rx_sock {
109 u32 rx_num_data_pkts;
110};
111
112static inline struct ccid2_hc_tx_sock *ccid2_hc_tx_sk(const struct sock *sk)
113{
114 return ccid_priv(dccp_sk(sk)->dccps_hc_tx_ccid);
115}
116
117static inline struct ccid2_hc_rx_sock *ccid2_hc_rx_sk(const struct sock *sk)
118{
119 return ccid_priv(dccp_sk(sk)->dccps_hc_rx_ccid);
120}
121#endif /* _DCCP_CCID2_H_ */
1/*
2 * Copyright (c) 2005 Andrea Bittau <a.bittau@cs.ucl.ac.uk>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 */
18#ifndef _DCCP_CCID2_H_
19#define _DCCP_CCID2_H_
20
21#include <linux/timer.h>
22#include <linux/types.h>
23#include "../ccid.h"
24#include "../dccp.h"
25
26/*
27 * CCID-2 timestamping faces the same issues as TCP timestamping.
28 * Hence we reuse/share as much of the code as possible.
29 */
30#define ccid2_time_stamp tcp_time_stamp
31
32/* NUMDUPACK parameter from RFC 4341, p. 6 */
33#define NUMDUPACK 3
34
35struct ccid2_seq {
36 u64 ccid2s_seq;
37 u32 ccid2s_sent;
38 int ccid2s_acked;
39 struct ccid2_seq *ccid2s_prev;
40 struct ccid2_seq *ccid2s_next;
41};
42
43#define CCID2_SEQBUF_LEN 1024
44#define CCID2_SEQBUF_MAX 128
45
46/*
47 * Multiple of congestion window to keep the sequence window at
48 * (RFC 4340 7.5.2)
49 */
50#define CCID2_WIN_CHANGE_FACTOR 5
51
52/**
53 * struct ccid2_hc_tx_sock - CCID2 TX half connection
54 * @tx_{cwnd,ssthresh,pipe}: as per RFC 4341, section 5
55 * @tx_packets_acked: Ack counter for deriving cwnd growth (RFC 3465)
56 * @tx_srtt: smoothed RTT estimate, scaled by 2^3
57 * @tx_mdev: smoothed RTT variation, scaled by 2^2
58 * @tx_mdev_max: maximum of @mdev during one flight
59 * @tx_rttvar: moving average/maximum of @mdev_max
60 * @tx_rto: RTO value deriving from SRTT and RTTVAR (RFC 2988)
61 * @tx_rtt_seq: to decay RTTVAR at most once per flight
62 * @tx_cwnd_used: actually used cwnd, W_used of RFC 2861
63 * @tx_expected_wnd: moving average of @tx_cwnd_used
64 * @tx_cwnd_stamp: to track idle periods in CWV
65 * @tx_lsndtime: last time (in jiffies) a data packet was sent
66 * @tx_rpseq: last consecutive seqno
67 * @tx_rpdupack: dupacks since rpseq
68 * @tx_av_chunks: list of Ack Vectors received on current skb
69 */
70struct ccid2_hc_tx_sock {
71 u32 tx_cwnd;
72 u32 tx_ssthresh;
73 u32 tx_pipe;
74 u32 tx_packets_acked;
75 struct ccid2_seq *tx_seqbuf[CCID2_SEQBUF_MAX];
76 int tx_seqbufc;
77 struct ccid2_seq *tx_seqh;
78 struct ccid2_seq *tx_seqt;
79
80 /* RTT measurement: variables/principles are the same as in TCP */
81 u32 tx_srtt,
82 tx_mdev,
83 tx_mdev_max,
84 tx_rttvar,
85 tx_rto;
86 u64 tx_rtt_seq:48;
87 struct timer_list tx_rtotimer;
88
89 /* Congestion Window validation (optional, RFC 2861) */
90 u32 tx_cwnd_used,
91 tx_expected_wnd,
92 tx_cwnd_stamp,
93 tx_lsndtime;
94
95 u64 tx_rpseq;
96 int tx_rpdupack;
97 u32 tx_last_cong;
98 u64 tx_high_ack;
99 struct list_head tx_av_chunks;
100};
101
102static inline bool ccid2_cwnd_network_limited(struct ccid2_hc_tx_sock *hc)
103{
104 return hc->tx_pipe >= hc->tx_cwnd;
105}
106
107/*
108 * Convert RFC 3390 larger initial window into an equivalent number of packets.
109 * This is based on the numbers specified in RFC 5681, 3.1.
110 */
111static inline u32 rfc3390_bytes_to_packets(const u32 smss)
112{
113 return smss <= 1095 ? 4 : (smss > 2190 ? 2 : 3);
114}
115
116/**
117 * struct ccid2_hc_rx_sock - Receiving end of CCID-2 half-connection
118 * @rx_num_data_pkts: number of data packets received since last feedback
119 */
120struct ccid2_hc_rx_sock {
121 u32 rx_num_data_pkts;
122};
123
124static inline struct ccid2_hc_tx_sock *ccid2_hc_tx_sk(const struct sock *sk)
125{
126 return ccid_priv(dccp_sk(sk)->dccps_hc_tx_ccid);
127}
128
129static inline struct ccid2_hc_rx_sock *ccid2_hc_rx_sk(const struct sock *sk)
130{
131 return ccid_priv(dccp_sk(sk)->dccps_hc_rx_ccid);
132}
133#endif /* _DCCP_CCID2_H_ */