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