release/src-rt-6.x/linux/linux-2.6/net/dccp/ccids/ccid3.h

   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 /* Two seconds as per RFC 3448 4.2 */
  46 #define TFRC_INITIAL_TIMEOUT       (2 * USEC_PER_SEC)
  47
  48 /* In usecs - half the scheduling granularity as per RFC3448 4.6 */
  49 #define TFRC_OPSYS_HALF_TIME_GRAN  (USEC_PER_SEC / (2 * HZ))
  50
  51 /* Parameter t_mbi from [RFC 3448, 4.3]: backoff interval in seconds */
  52 #define TFRC_T_MBI                 64
  53
  54 enum ccid3_options {
  55         TFRC_OPT_LOSS_EVENT_RATE = 192,
  56         TFRC_OPT_LOSS_INTERVALS  = 193,
  57         TFRC_OPT_RECEIVE_RATE    = 194,
  58 };
  59
  60 struct ccid3_options_received {
  61         u64 ccid3or_seqno:48,
  62             ccid3or_loss_intervals_idx:16;
  63         u16 ccid3or_loss_intervals_len;
  64         u32 ccid3or_loss_event_rate;
  65         u32 ccid3or_receive_rate;
  66 };
  67
  68 /* TFRC sender states */
  69 enum ccid3_hc_tx_states {
  70         TFRC_SSTATE_NO_SENT = 1,
  71         TFRC_SSTATE_NO_FBACK,
  72         TFRC_SSTATE_FBACK,
  73         TFRC_SSTATE_TERM,
  74 };
  75
  76 /** struct ccid3_hc_tx_sock - CCID3 sender half-connection socket
  77  *
  78  * @ccid3hctx_x - Current sending rate in 64 * bytes per second
  79  * @ccid3hctx_x_recv - Receive rate    in 64 * bytes per second
  80  * @ccid3hctx_x_calc - Calculated rate in bytes per second
  81  * @ccid3hctx_rtt - Estimate of current round trip time in usecs
  82  * @ccid3hctx_p - Current loss event rate (0-1) scaled by 1000000
  83  * @ccid3hctx_s - Packet size in bytes
  84  * @ccid3hctx_t_rto - Nofeedback Timer setting in usecs
  85  * @ccid3hctx_t_ipi - Interpacket (send) interval (RFC 3448, 4.6) in usecs
  86  * @ccid3hctx_state - Sender state, one of %ccid3_hc_tx_states
  87  * @ccid3hctx_last_win_count - Last window counter sent
  88  * @ccid3hctx_t_last_win_count - Timestamp of earliest packet
  89  *                               with last_win_count value sent
  90  * @ccid3hctx_no_feedback_timer - Handle to no feedback timer
  91  * @ccid3hctx_idle - Flag indicating that sender is idling
  92  * @ccid3hctx_t_ld - Time last doubled during slow start
  93  * @ccid3hctx_t_nom - Nominal send time of next packet
  94  * @ccid3hctx_delta - Send timer delta (RFC 3448, 4.6) in usecs
  95  * @ccid3hctx_hist - Packet history
  96  * @ccid3hctx_options_received - Parsed set of retrieved options
  97  */
  98 struct ccid3_hc_tx_sock {
  99         struct tfrc_tx_info             ccid3hctx_tfrc;
 100 #define ccid3hctx_x                     ccid3hctx_tfrc.tfrctx_x
 101 #define ccid3hctx_x_recv                ccid3hctx_tfrc.tfrctx_x_recv
 102 #define ccid3hctx_x_calc                ccid3hctx_tfrc.tfrctx_x_calc
 103 #define ccid3hctx_rtt                   ccid3hctx_tfrc.tfrctx_rtt
 104 #define ccid3hctx_p                     ccid3hctx_tfrc.tfrctx_p
 105 #define ccid3hctx_t_rto                 ccid3hctx_tfrc.tfrctx_rto
 106 #define ccid3hctx_t_ipi                 ccid3hctx_tfrc.tfrctx_ipi
 107         u16                             ccid3hctx_s;
 108         enum ccid3_hc_tx_states         ccid3hctx_state:8;
 109         u8                              ccid3hctx_last_win_count;
 110         u8                              ccid3hctx_idle;
 111         struct timeval                  ccid3hctx_t_last_win_count;
 112         struct timer_list               ccid3hctx_no_feedback_timer;
 113         struct timeval                  ccid3hctx_t_ld;
 114         struct timeval                  ccid3hctx_t_nom;
 115         u32                             ccid3hctx_delta;
 116         struct list_head                ccid3hctx_hist;
 117         struct ccid3_options_received   ccid3hctx_options_received;
 118 };
 119
 120 /* TFRC receiver states */
 121 enum ccid3_hc_rx_states {
 122         TFRC_RSTATE_NO_DATA = 1,
 123         TFRC_RSTATE_DATA,
 124         TFRC_RSTATE_TERM    = 127,
 125 };
 126
 127 /** struct ccid3_hc_rx_sock - CCID3 receiver half-connection socket
 128  *
 129  *  @ccid3hcrx_x_recv  -  Receiver estimate of send rate (RFC 3448 4.3)
 130  *  @ccid3hcrx_rtt  -  Receiver estimate of rtt (non-standard)
 131  *  @ccid3hcrx_p  -  current loss event rate (RFC 3448 5.4)
 132  *  @ccid3hcrx_seqno_nonloss  -  Last received non-loss sequence number
 133  *  @ccid3hcrx_ccval_nonloss  -  Last received non-loss Window CCVal
 134  *  @ccid3hcrx_ccval_last_counter  -  Tracks window counter (RFC 4342, 8.1)
 135  *  @ccid3hcrx_state  -  receiver state, one of %ccid3_hc_rx_states
 136  *  @ccid3hcrx_bytes_recv  -  Total sum of DCCP payload bytes
 137  *  @ccid3hcrx_tstamp_last_feedback  -  Time at which last feedback was sent
 138  *  @ccid3hcrx_tstamp_last_ack  -  Time at which last feedback was sent
 139  *  @ccid3hcrx_hist  -  Packet history
 140  *  @ccid3hcrx_li_hist  -  Loss Interval History
 141  *  @ccid3hcrx_s  -  Received packet size in bytes
 142  *  @ccid3hcrx_pinv  -  Inverse of Loss Event Rate (RFC 4342, sec. 8.5)
 143  *  @ccid3hcrx_elapsed_time  -  Time since packet reception
 144  */
 145 struct ccid3_hc_rx_sock {
 146         struct tfrc_rx_info             ccid3hcrx_tfrc;
 147 #define ccid3hcrx_x_recv                ccid3hcrx_tfrc.tfrcrx_x_recv
 148 #define ccid3hcrx_rtt                   ccid3hcrx_tfrc.tfrcrx_rtt
 149 #define ccid3hcrx_p                     ccid3hcrx_tfrc.tfrcrx_p
 150         u64                             ccid3hcrx_seqno_nonloss:48,
 151                                         ccid3hcrx_ccval_nonloss:4,
 152                                         ccid3hcrx_ccval_last_counter:4;
 153         enum ccid3_hc_rx_states         ccid3hcrx_state:8;
 154         u32                             ccid3hcrx_bytes_recv;
 155         struct timeval                  ccid3hcrx_tstamp_last_feedback;
 156         struct timeval                  ccid3hcrx_tstamp_last_ack;
 157         struct list_head                ccid3hcrx_hist;
 158         struct list_head                ccid3hcrx_li_hist;
 159         u16                             ccid3hcrx_s;
 160         u32                             ccid3hcrx_pinv;
 161         u32                             ccid3hcrx_elapsed_time;
 162 };
 163
 164 static inline struct ccid3_hc_tx_sock *ccid3_hc_tx_sk(const struct sock *sk)
 165 {
 166     return ccid_priv(dccp_sk(sk)->dccps_hc_tx_ccid);
 167 }
 168
 169 static inline struct ccid3_hc_rx_sock *ccid3_hc_rx_sk(const struct sock *sk)
 170 {
 171     return ccid_priv(dccp_sk(sk)->dccps_hc_rx_ccid);
 172 }
 173
 174 #endif /* _DCCP_CCID3_H_ */