summaryrefslogtreecommitdiff
path: root/net/dccp/ccids/ccid3.h
blob: d16f00d784f39375a771550280281ba0d53d4c19 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
/*
 *  net/dccp/ccids/ccid3.h
 *
 *  Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
 *
 *  An implementation of the DCCP protocol
 *
 *  This code has been developed by the University of Waikato WAND
 *  research group. For further information please see http://www.wand.net.nz/
 *  or e-mail Ian McDonald - iam4@cs.waikato.ac.nz
 *
 *  This code also uses code from Lulea University, rereleased as GPL by its
 *  authors:
 *  Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
 *
 *  Changes to meet Linux coding standards, to make it meet latest ccid3 draft
 *  and to make it work as a loadable module in the DCCP stack written by
 *  Arnaldo Carvalho de Melo <acme@conectiva.com.br>.
 *
 *  Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 *
 *  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_CCID3_H_
#define _DCCP_CCID3_H_

#include <linux/config.h>
#include <linux/list.h>
#include <linux/time.h>
#include <linux/types.h>

#define TFRC_MIN_PACKET_SIZE	   16
#define TFRC_STD_PACKET_SIZE	  256
#define TFRC_MAX_PACKET_SIZE	65535

/* Two seconds as per CCID3 spec */
#define TFRC_INITIAL_TIMEOUT	   (2 * USEC_PER_SEC)

/* In usecs - half the scheduling granularity as per RFC3448 4.6 */
#define TFRC_OPSYS_HALF_TIME_GRAN  (USEC_PER_SEC / (2 * HZ))

/* In seconds */
#define TFRC_MAX_BACK_OFF_TIME	   64

#define TFRC_SMALLEST_P		   40

enum ccid3_options {
	TFRC_OPT_LOSS_EVENT_RATE = 192,
	TFRC_OPT_LOSS_INTERVALS	 = 193,
	TFRC_OPT_RECEIVE_RATE	 = 194,
};

struct ccid3_options_received {
	u64 ccid3or_seqno:48,
	    ccid3or_loss_intervals_idx:16;
	u16 ccid3or_loss_intervals_len;
	u32 ccid3or_loss_event_rate;
	u32 ccid3or_receive_rate;
};

/** struct ccid3_hc_tx_sock - CCID3 sender half connection sock
 *
  * @ccid3hctx_state - Sender state
  * @ccid3hctx_x - Current sending rate
  * @ccid3hctx_x_recv - Receive rate
  * @ccid3hctx_x_calc - Calculated send (?) rate
  * @ccid3hctx_s - Packet size
  * @ccid3hctx_rtt - Estimate of current round trip time in usecs
  * @@ccid3hctx_p - Current loss event rate (0-1) scaled by 1000000
  * @ccid3hctx_last_win_count - Last window counter sent
  * @ccid3hctx_t_last_win_count - Timestamp of earliest packet
  * 				  with last_win_count value sent
  * @ccid3hctx_no_feedback_timer - Handle to no feedback timer
  * @ccid3hctx_idle - FIXME
  * @ccid3hctx_t_ld - Time last doubled during slow start
  * @ccid3hctx_t_nom - Nominal send time of next packet
  * @ccid3hctx_t_ipi - Interpacket (send) interval
  * @ccid3hctx_delta - Send timer delta
  * @ccid3hctx_hist - Packet history
  */
struct ccid3_hc_tx_sock {
	u32				ccid3hctx_x;
	u32				ccid3hctx_x_recv;
	u32				ccid3hctx_x_calc;
	u16				ccid3hctx_s;
	u32				ccid3hctx_rtt;
	u32				ccid3hctx_p;
  	u8				ccid3hctx_state;
	u8				ccid3hctx_last_win_count;
	u8				ccid3hctx_idle;
	struct timeval			ccid3hctx_t_last_win_count;
	struct timer_list		ccid3hctx_no_feedback_timer;
	struct timeval			ccid3hctx_t_ld;
	struct timeval			ccid3hctx_t_nom;
	u32				ccid3hctx_t_rto;
	u32				ccid3hctx_t_ipi;
	u32				ccid3hctx_delta;
	struct list_head		ccid3hctx_hist;
	struct ccid3_options_received	ccid3hctx_options_received;
};

struct ccid3_hc_rx_sock {
  	u64			ccid3hcrx_seqno_last_counter:48,
				ccid3hcrx_state:8,
				ccid3hcrx_last_counter:4;
	u32			ccid3hcrx_rtt;
  	u32			ccid3hcrx_p;
  	u32			ccid3hcrx_bytes_recv;
  	struct timeval		ccid3hcrx_tstamp_last_feedback;
  	struct timeval		ccid3hcrx_tstamp_last_ack;
	struct list_head	ccid3hcrx_hist;
	struct list_head	ccid3hcrx_li_hist;
  	u16			ccid3hcrx_s;
  	u32			ccid3hcrx_pinv;
  	u32			ccid3hcrx_elapsed_time;
  	u32			ccid3hcrx_x_recv;
};

static inline struct ccid3_hc_tx_sock *ccid3_hc_tx_sk(const struct sock *sk)
{
    return dccp_sk(sk)->dccps_hc_tx_ccid_private;
}

static inline struct ccid3_hc_rx_sock *ccid3_hc_rx_sk(const struct sock *sk)
{
    return dccp_sk(sk)->dccps_hc_rx_ccid_private;
}

#endif /* _DCCP_CCID3_H_ */