--- /dev/null
+/*
+ * 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 http://www.wand.net.nz/
+ * or e-mail Ian McDonald - ian.mcdonald@jandi.co.nz
+ *
+ * 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 <acme@conectiva.com.br>.
+ *
+ * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#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 (2 * USEC_PER_SEC)
+
+/* Parameter t_mbi from [RFC 3448, 4.3]: backoff interval in seconds */
+#define TFRC_T_MBI 64
+
+/*
+ * 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 USEC_PER_MSEC
+#else
+# define TFRC_T_DELTA (USEC_PER_SEC / (2 * HZ))
+#endif
+
+enum ccid3_options {
+ TFRC_OPT_LOSS_EVENT_RATE = 192,
+ TFRC_OPT_LOSS_INTERVALS = 193,
+ TFRC_OPT_RECEIVE_RATE = 194,
+};
+
+/* TFRC sender states */
+enum ccid3_hc_tx_states {
+ TFRC_SSTATE_NO_SENT = 1,
+ TFRC_SSTATE_NO_FBACK,
+ TFRC_SSTATE_FBACK,
+};
+
+/**
+ * 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 {
+ u64 tx_x;
+ u64 tx_x_recv;
+ u32 tx_x_calc;
+ u32 tx_rtt;
+ u32 tx_p;
+ u32 tx_t_rto;
+ u32 tx_t_ipi;
+ u16 tx_s;
+ enum ccid3_hc_tx_states tx_state:8;
+ u8 tx_last_win_count;
+ ktime_t tx_t_last_win_count;
+ struct timer_list tx_no_feedback_timer;
+ ktime_t tx_t_ld;
+ ktime_t tx_t_nom;
+ struct tfrc_tx_hist_entry *tx_hist;
+};
+
+static inline struct ccid3_hc_tx_sock *ccid3_hc_tx_sk(const struct sock *sk)
+{
+ struct ccid3_hc_tx_sock *hctx = ccid_priv(dccp_sk(sk)->dccps_hc_tx_ccid);
+ BUG_ON(hctx == NULL);
+ return hctx;
+}
+
+/* TFRC receiver states */
+enum ccid3_hc_rx_states {
+ TFRC_RSTATE_NO_DATA = 1,
+ TFRC_RSTATE_DATA,
+};
+
+/**
+ * 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 {
+ u8 rx_last_counter:4;
+ enum ccid3_hc_rx_states rx_state:8;
+ u32 rx_bytes_recv;
+ u32 rx_x_recv;
+ u32 rx_rtt;
+ ktime_t rx_tstamp_last_feedback;
+ struct tfrc_rx_hist rx_hist;
+ struct tfrc_loss_hist rx_li_hist;
+ u16 rx_s;
+#define rx_pinv rx_li_hist.i_mean
+};
+
+static inline struct ccid3_hc_rx_sock *ccid3_hc_rx_sk(const struct sock *sk)
+{
+ struct ccid3_hc_rx_sock *hcrx = ccid_priv(dccp_sk(sk)->dccps_hc_rx_ccid);
+ BUG_ON(hcrx == NULL);
+ return hcrx;
+}
+
+#endif /* _DCCP_CCID3_H_ */
Code Review / kvmfornfv.git / blobdiff