2 * net/dccp/ccids/ccid3.h
4 * Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
6 * An implementation of the DCCP protocol
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 - iam4@cs.waikato.ac.nz
12 * This code also uses code from Lulea University, rereleased as GPL by its
14 * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
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>.
20 * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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.
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.
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.
36 #ifndef _DCCP_CCID3_H_
37 #define _DCCP_CCID3_H_
39 #include <linux/config.h>
40 #include <linux/list.h>
41 #include <linux/time.h>
42 #include <linux/types.h>
44 #define TFRC_MIN_PACKET_SIZE 16
45 #define TFRC_STD_PACKET_SIZE 256
46 #define TFRC_MAX_PACKET_SIZE 65535
48 /* Two seconds as per CCID3 spec */
49 #define TFRC_INITIAL_TIMEOUT (2 * USEC_PER_SEC)
51 #define TFRC_INITIAL_IPI (USEC_PER_SEC / 4)
53 /* In usecs - half the scheduling granularity as per RFC3448 4.6 */
54 #define TFRC_OPSYS_HALF_TIME_GRAN (USEC_PER_SEC / (2 * HZ))
57 #define TFRC_MAX_BACK_OFF_TIME 64
59 #define TFRC_SMALLEST_P 40
62 TFRC_OPT_LOSS_EVENT_RATE
= 192,
63 TFRC_OPT_LOSS_INTERVALS
= 193,
64 TFRC_OPT_RECEIVE_RATE
= 194,
67 struct ccid3_options_received
{
69 ccid3or_loss_intervals_idx
:16;
70 u16 ccid3or_loss_intervals_len
;
71 u32 ccid3or_loss_event_rate
;
72 u32 ccid3or_receive_rate
;
75 /** struct ccid3_hc_tx_sock - CCID3 sender half connection sock
77 * @ccid3hctx_state - Sender state
78 * @ccid3hctx_x - Current sending rate
79 * @ccid3hctx_x_recv - Receive rate
80 * @ccid3hctx_x_calc - Calculated send (?) rate
81 * @ccid3hctx_s - Packet size
82 * @ccid3hctx_rtt - Estimate of current round trip time in usecs
83 * @@ccid3hctx_p - Current loss event rate (0-1) scaled by 1000000
84 * @ccid3hctx_last_win_count - Last window counter sent
85 * @ccid3hctx_t_last_win_count - Timestamp of earliest packet
86 * with last_win_count value sent
87 * @ccid3hctx_no_feedback_timer - Handle to no feedback timer
88 * @ccid3hctx_idle - FIXME
89 * @ccid3hctx_t_ld - Time last doubled during slow start
90 * @ccid3hctx_t_nom - Nominal send time of next packet
91 * @ccid3hctx_t_ipi - Interpacket (send) interval
92 * @ccid3hctx_delta - Send timer delta
93 * @ccid3hctx_hist - Packet history
95 struct ccid3_hc_tx_sock
{
103 u8 ccid3hctx_last_win_count
;
105 struct timeval ccid3hctx_t_last_win_count
;
106 struct timer_list ccid3hctx_no_feedback_timer
;
107 struct timeval ccid3hctx_t_ld
;
108 struct timeval ccid3hctx_t_nom
;
112 struct list_head ccid3hctx_hist
;
113 struct ccid3_options_received ccid3hctx_options_received
;
116 struct ccid3_hc_rx_sock
{
117 u64 ccid3hcrx_seqno_last_counter
:48,
119 ccid3hcrx_last_counter
:4;
122 u32 ccid3hcrx_bytes_recv
;
123 struct timeval ccid3hcrx_tstamp_last_feedback
;
124 struct timeval ccid3hcrx_tstamp_last_ack
;
125 struct list_head ccid3hcrx_hist
;
126 struct list_head ccid3hcrx_li_hist
;
129 u32 ccid3hcrx_elapsed_time
;
130 u32 ccid3hcrx_x_recv
;
133 static inline struct ccid3_hc_tx_sock
*ccid3_hc_tx_sk(const struct sock
*sk
)
135 return dccp_sk(sk
)->dccps_hc_tx_ccid_private
;
138 static inline struct ccid3_hc_rx_sock
*ccid3_hc_rx_sk(const struct sock
*sk
)
140 return dccp_sk(sk
)->dccps_hc_rx_ccid_private
;
143 #endif /* _DCCP_CCID3_H_ */