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148 lines
4.7 KiB
148 lines
4.7 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* Copyright (c) 2005-7 The University of Waikato, Hamilton, New Zealand. |
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* Copyright (c) 2007 The University of Aberdeen, Scotland, UK |
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* |
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* An implementation of the DCCP protocol |
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* |
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* This code has been developed by the University of Waikato WAND |
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* research group. For further information please see https://www.wand.net.nz/ |
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* or e-mail Ian McDonald - [email protected] |
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* |
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* This code also uses code from Lulea University, rereleased as GPL by its |
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* authors: |
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* Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon |
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* |
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* Changes to meet Linux coding standards, to make it meet latest ccid3 draft |
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* and to make it work as a loadable module in the DCCP stack written by |
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* Arnaldo Carvalho de Melo <[email protected]>. |
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* |
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* Copyright (c) 2005 Arnaldo Carvalho de Melo <[email protected]> |
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*/ |
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#ifndef _DCCP_CCID3_H_ |
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#define _DCCP_CCID3_H_ |
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#include <linux/ktime.h> |
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#include <linux/list.h> |
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#include <linux/types.h> |
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#include <linux/tfrc.h> |
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#include "lib/tfrc.h" |
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#include "../ccid.h" |
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/* Two seconds as per RFC 5348, 4.2 */ |
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#define TFRC_INITIAL_TIMEOUT (2 * USEC_PER_SEC) |
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/* Parameter t_mbi from [RFC 3448, 4.3]: backoff interval in seconds */ |
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#define TFRC_T_MBI 64 |
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/* |
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* The t_delta parameter (RFC 5348, 8.3): delays of less than %USEC_PER_MSEC are |
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* rounded down to 0, since sk_reset_timer() here uses millisecond granularity. |
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* Hence we can use a constant t_delta = %USEC_PER_MSEC when HZ >= 500. A coarse |
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* resolution of HZ < 500 means that the error is below one timer tick (t_gran) |
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* when using the constant t_delta = t_gran / 2 = %USEC_PER_SEC / (2 * HZ). |
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*/ |
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#if (HZ >= 500) |
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# define TFRC_T_DELTA USEC_PER_MSEC |
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#else |
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# define TFRC_T_DELTA (USEC_PER_SEC / (2 * HZ)) |
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#endif |
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enum ccid3_options { |
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TFRC_OPT_LOSS_EVENT_RATE = 192, |
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TFRC_OPT_LOSS_INTERVALS = 193, |
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TFRC_OPT_RECEIVE_RATE = 194, |
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}; |
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/* TFRC sender states */ |
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enum ccid3_hc_tx_states { |
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TFRC_SSTATE_NO_SENT = 1, |
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TFRC_SSTATE_NO_FBACK, |
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TFRC_SSTATE_FBACK, |
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}; |
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/** |
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* struct ccid3_hc_tx_sock - CCID3 sender half-connection socket |
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* @tx_x: Current sending rate in 64 * bytes per second |
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* @tx_x_recv: Receive rate in 64 * bytes per second |
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* @tx_x_calc: Calculated rate in bytes per second |
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* @tx_rtt: Estimate of current round trip time in usecs |
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* @tx_p: Current loss event rate (0-1) scaled by 1000000 |
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* @tx_s: Packet size in bytes |
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* @tx_t_rto: Nofeedback Timer setting in usecs |
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* @tx_t_ipi: Interpacket (send) interval (RFC 3448, 4.6) in usecs |
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* @tx_state: Sender state, one of %ccid3_hc_tx_states |
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* @tx_last_win_count: Last window counter sent |
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* @tx_t_last_win_count: Timestamp of earliest packet |
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* with last_win_count value sent |
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* @tx_no_feedback_timer: Handle to no feedback timer |
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* @tx_t_ld: Time last doubled during slow start |
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* @tx_t_nom: Nominal send time of next packet |
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* @tx_hist: Packet history |
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*/ |
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struct ccid3_hc_tx_sock { |
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u64 tx_x; |
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u64 tx_x_recv; |
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u32 tx_x_calc; |
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u32 tx_rtt; |
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u32 tx_p; |
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u32 tx_t_rto; |
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u32 tx_t_ipi; |
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u16 tx_s; |
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enum ccid3_hc_tx_states tx_state:8; |
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u8 tx_last_win_count; |
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ktime_t tx_t_last_win_count; |
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struct timer_list tx_no_feedback_timer; |
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struct sock *sk; |
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ktime_t tx_t_ld; |
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ktime_t tx_t_nom; |
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struct tfrc_tx_hist_entry *tx_hist; |
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}; |
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static inline struct ccid3_hc_tx_sock *ccid3_hc_tx_sk(const struct sock *sk) |
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{ |
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struct ccid3_hc_tx_sock *hctx = ccid_priv(dccp_sk(sk)->dccps_hc_tx_ccid); |
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BUG_ON(hctx == NULL); |
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return hctx; |
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} |
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/* TFRC receiver states */ |
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enum ccid3_hc_rx_states { |
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TFRC_RSTATE_NO_DATA = 1, |
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TFRC_RSTATE_DATA, |
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}; |
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/** |
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* struct ccid3_hc_rx_sock - CCID3 receiver half-connection socket |
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* @rx_last_counter: Tracks window counter (RFC 4342, 8.1) |
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* @rx_state: Receiver state, one of %ccid3_hc_rx_states |
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* @rx_bytes_recv: Total sum of DCCP payload bytes |
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* @rx_x_recv: Receiver estimate of send rate (RFC 3448, sec. 4.3) |
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* @rx_rtt: Receiver estimate of RTT |
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* @rx_tstamp_last_feedback: Time at which last feedback was sent |
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* @rx_hist: Packet history (loss detection + RTT sampling) |
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* @rx_li_hist: Loss Interval database |
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* @rx_s: Received packet size in bytes |
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* @rx_pinv: Inverse of Loss Event Rate (RFC 4342, sec. 8.5) |
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*/ |
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struct ccid3_hc_rx_sock { |
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u8 rx_last_counter:4; |
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enum ccid3_hc_rx_states rx_state:8; |
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u32 rx_bytes_recv; |
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u32 rx_x_recv; |
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u32 rx_rtt; |
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ktime_t rx_tstamp_last_feedback; |
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struct tfrc_rx_hist rx_hist; |
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struct tfrc_loss_hist rx_li_hist; |
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u16 rx_s; |
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#define rx_pinv rx_li_hist.i_mean |
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}; |
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static inline struct ccid3_hc_rx_sock *ccid3_hc_rx_sk(const struct sock *sk) |
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{ |
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struct ccid3_hc_rx_sock *hcrx = ccid_priv(dccp_sk(sk)->dccps_hc_rx_ccid); |
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BUG_ON(hcrx == NULL); |
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return hcrx; |
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} |
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#endif /* _DCCP_CCID3_H_ */
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