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1/*
2 * net/dccp/ccids/ccid3.h
3 *
4 * Copyright (c) 2005-6 The University of Waikato, Hamilton, New Zealand.
5 *
6 * An implementation of the DCCP protocol
7 *
8 * This code has been developed by the University of Waikato WAND
9 * research group. For further information please see http://www.wand.net.nz/
10 * or e-mail Ian McDonald - ian.mcdonald@jandi.co.nz
11 *
12 * This code also uses code from Lulea University, rereleased as GPL by its
13 * authors:
14 * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
15 *
16 * Changes to meet Linux coding standards, to make it meet latest ccid3 draft
17 * and to make it work as a loadable module in the DCCP stack written by
18 * Arnaldo Carvalho de Melo <acme@conectiva.com.br>.
19 *
20 * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
21 *
22 * This program is free software; you can redistribute it and/or modify
23 * it under the terms of the GNU General Public License as published by
24 * the Free Software Foundation; either version 2 of the License, or
25 * (at your option) any later version.
26 *
27 * This program is distributed in the hope that it will be useful,
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
30 * GNU General Public License for more details.
31 *
32 * You should have received a copy of the GNU General Public License
33 * along with this program; if not, write to the Free Software
34 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 */
36#ifndef _DCCP_CCID3_H_
37#define _DCCP_CCID3_H_
38
39#include <linux/list.h>
40#include <linux/time.h>
41#include <linux/types.h>
42#include <linux/tfrc.h>
43#include "../ccid.h"
44
45#define TFRC_MIN_PACKET_SIZE 16
46#define TFRC_STD_PACKET_SIZE 256
47#define TFRC_MAX_PACKET_SIZE 65535
48
49/* Two seconds as per CCID3 spec */
50#define TFRC_INITIAL_TIMEOUT (2 * USEC_PER_SEC)
51
52#define TFRC_INITIAL_IPI (USEC_PER_SEC / 4)
53
54/* In usecs - half the scheduling granularity as per RFC3448 4.6 */
55#define TFRC_OPSYS_HALF_TIME_GRAN (USEC_PER_SEC / (2 * HZ))
56
57/* In seconds */
58#define TFRC_MAX_BACK_OFF_TIME 64
59
60#define TFRC_SMALLEST_P 40
61
62enum ccid3_options {
63 TFRC_OPT_LOSS_EVENT_RATE = 192,
64 TFRC_OPT_LOSS_INTERVALS = 193,
65 TFRC_OPT_RECEIVE_RATE = 194,
66};
67
68struct ccid3_options_received {
69 u64 ccid3or_seqno:48,
70 ccid3or_loss_intervals_idx:16;
71 u16 ccid3or_loss_intervals_len;
72 u32 ccid3or_loss_event_rate;
73 u32 ccid3or_receive_rate;
74};
75
76/** struct ccid3_hc_tx_sock - CCID3 sender half connection sock
77 *
78 * @ccid3hctx_state - Sender state
79 * @ccid3hctx_x - Current sending rate
80 * @ccid3hctx_x_recv - Receive rate
81 * @ccid3hctx_x_calc - Calculated send (?) rate
82 * @ccid3hctx_s - Packet size
83 * @ccid3hctx_rtt - Estimate of current round trip time in usecs
84 * @@ccid3hctx_p - Current loss event rate (0-1) scaled by 1000000
85 * @ccid3hctx_last_win_count - Last window counter sent
86 * @ccid3hctx_t_last_win_count - Timestamp of earliest packet
87 * with last_win_count value sent
88 * @ccid3hctx_no_feedback_timer - Handle to no feedback timer
89 * @ccid3hctx_idle - FIXME
90 * @ccid3hctx_t_ld - Time last doubled during slow start
91 * @ccid3hctx_t_nom - Nominal send time of next packet
92 * @ccid3hctx_t_ipi - Interpacket (send) interval
93 * @ccid3hctx_delta - Send timer delta
94 * @ccid3hctx_hist - Packet history
95 */
96struct ccid3_hc_tx_sock {
97 struct tfrc_tx_info ccid3hctx_tfrc;
98#define ccid3hctx_x ccid3hctx_tfrc.tfrctx_x
99#define ccid3hctx_x_recv ccid3hctx_tfrc.tfrctx_x_recv
100#define ccid3hctx_x_calc ccid3hctx_tfrc.tfrctx_x_calc
101#define ccid3hctx_rtt ccid3hctx_tfrc.tfrctx_rtt
102#define ccid3hctx_p ccid3hctx_tfrc.tfrctx_p
103#define ccid3hctx_t_rto ccid3hctx_tfrc.tfrctx_rto
104#define ccid3hctx_t_ipi ccid3hctx_tfrc.tfrctx_ipi
105 u16 ccid3hctx_s;
106 u8 ccid3hctx_state;
107 u8 ccid3hctx_last_win_count;
108 u8 ccid3hctx_idle;
109 struct timeval ccid3hctx_t_last_win_count;
110 struct timer_list ccid3hctx_no_feedback_timer;
111 struct timeval ccid3hctx_t_ld;
112 struct timeval ccid3hctx_t_nom;
113 u32 ccid3hctx_delta;
114 struct list_head ccid3hctx_hist;
115 struct ccid3_options_received ccid3hctx_options_received;
116};
117
118struct ccid3_hc_rx_sock {
119 struct tfrc_rx_info ccid3hcrx_tfrc;
120#define ccid3hcrx_x_recv ccid3hcrx_tfrc.tfrcrx_x_recv
121#define ccid3hcrx_rtt ccid3hcrx_tfrc.tfrcrx_rtt
122#define ccid3hcrx_p ccid3hcrx_tfrc.tfrcrx_p
123 u64 ccid3hcrx_seqno_nonloss:48,
124 ccid3hcrx_ccval_nonloss:4,
125 ccid3hcrx_state:8,
126 ccid3hcrx_ccval_last_counter:4;
127 u32 ccid3hcrx_bytes_recv;
128 struct timeval ccid3hcrx_tstamp_last_feedback;
129 struct timeval ccid3hcrx_tstamp_last_ack;
130 struct list_head ccid3hcrx_hist;
131 struct list_head ccid3hcrx_li_hist;
132 u16 ccid3hcrx_s;
133 u32 ccid3hcrx_pinv;
134 u32 ccid3hcrx_elapsed_time;
135};
136
137static inline struct ccid3_hc_tx_sock *ccid3_hc_tx_sk(const struct sock *sk)
138{
139 return ccid_priv(dccp_sk(sk)->dccps_hc_tx_ccid);
140}
141
142static inline struct ccid3_hc_rx_sock *ccid3_hc_rx_sk(const struct sock *sk)
143{
144 return ccid_priv(dccp_sk(sk)->dccps_hc_rx_ccid);
145}
146
147#endif /* _DCCP_CCID3_H_ */