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 62 enum ccid3_options { 63 TFRC_OPT_LOSS_EVENT_RATE = 192, 64 TFRC_OPT_LOSS_INTERVALS = 193, 65 TFRC_OPT_RECEIVE_RATE = 194, 66 }; 67 68 struct 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 */ 96 struct 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 }; 117 118 struct 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 }; 136 137 static 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 } 141 142 static 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_ */ 148