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 /* In usecs - half the scheduling granularity as per RFC3448 4.6 */
52 #define TFRC_OPSYS_HALF_TIME_GRAN (USEC_PER_SEC / (2 * HZ))
55 #define TFRC_MAX_BACK_OFF_TIME 64
57 #define TFRC_SMALLEST_P 40
60 TFRC_OPT_LOSS_EVENT_RATE
= 192,
61 TFRC_OPT_LOSS_INTERVALS
= 193,
62 TFRC_OPT_RECEIVE_RATE
= 194,
65 struct ccid3_options_received
{
67 ccid3or_loss_intervals_idx
:16;
68 u16 ccid3or_loss_intervals_len
;
69 u32 ccid3or_loss_event_rate
;
70 u32 ccid3or_receive_rate
;
73 /** struct ccid3_hc_tx_sock - CCID3 sender half connection sock
75 * @ccid3hctx_state - Sender state
76 * @ccid3hctx_x - Current sending rate
77 * @ccid3hctx_x_recv - Receive rate
78 * @ccid3hctx_x_calc - Calculated send (?) rate
79 * @ccid3hctx_s - Packet size
80 * @ccid3hctx_rtt - Estimate of current round trip time in usecs
81 * @@ccid3hctx_p - Current loss event rate (0-1) scaled by 1000000
82 * @ccid3hctx_last_win_count - Last window counter sent
83 * @ccid3hctx_t_last_win_count - Timestamp of earliest packet
84 * with last_win_count value sent
85 * @ccid3hctx_no_feedback_timer - Handle to no feedback timer
86 * @ccid3hctx_idle - FIXME
87 * @ccid3hctx_t_ld - Time last doubled during slow start
88 * @ccid3hctx_t_nom - Nominal send time of next packet
89 * @ccid3hctx_t_ipi - Interpacket (send) interval
90 * @ccid3hctx_delta - Send timer delta
91 * @ccid3hctx_hist - Packet history
93 struct ccid3_hc_tx_sock
{
101 u8 ccid3hctx_last_win_count
;
103 struct timeval ccid3hctx_t_last_win_count
;
104 struct timer_list ccid3hctx_no_feedback_timer
;
105 struct timeval ccid3hctx_t_ld
;
106 struct timeval ccid3hctx_t_nom
;
110 struct list_head ccid3hctx_hist
;
111 struct ccid3_options_received ccid3hctx_options_received
;
114 struct ccid3_hc_rx_sock
{
115 u64 ccid3hcrx_seqno_last_counter
:48,
117 ccid3hcrx_last_counter
:4;
118 unsigned long ccid3hcrx_rtt
;
120 u32 ccid3hcrx_bytes_recv
;
121 struct timeval ccid3hcrx_tstamp_last_feedback
;
122 struct timeval ccid3hcrx_tstamp_last_ack
;
123 struct list_head ccid3hcrx_hist
;
124 struct list_head ccid3hcrx_li_hist
;
127 u32 ccid3hcrx_elapsed_time
;
128 u32 ccid3hcrx_x_recv
;
131 #define ccid3_hc_tx_field(s,field) (s->dccps_hc_tx_ccid_private == NULL ? 0 : \
132 ((struct ccid3_hc_tx_sock *)s->dccps_hc_tx_ccid_private)->ccid3hctx_##field)
134 #define ccid3_hc_rx_field(s,field) (s->dccps_hc_rx_ccid_private == NULL ? 0 : \
135 ((struct ccid3_hc_rx_sock *)s->dccps_hc_rx_ccid_private)->ccid3hcrx_##field)
137 #endif /* _DCCP_CCID3_H_ */