2005-08-10 11:14:34 +08:00
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/*
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* net/dccp/ccids/ccid3.c
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*
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2007-05-28 23:23:29 +08:00
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* Copyright (c) 2005-7 The University of Waikato, Hamilton, New Zealand.
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* Copyright (c) 2005-7 Ian McDonald <ian.mcdonald@jandi.co.nz>
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2005-08-10 11:14:34 +08:00
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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 http://www.wand.net.nz/
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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 <acme@conectiva.com.br>.
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*
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* Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "../ccid.h"
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#include "../dccp.h"
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2005-08-28 10:18:26 +08:00
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#include "lib/packet_history.h"
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2005-08-28 10:03:09 +08:00
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#include "lib/loss_interval.h"
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2005-08-28 11:47:15 +08:00
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#include "lib/tfrc.h"
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2005-08-10 11:14:34 +08:00
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#include "ccid3.h"
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2006-11-21 04:28:09 +08:00
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#ifdef CONFIG_IP_DCCP_CCID3_DEBUG
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static int ccid3_debug;
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#define ccid3_pr_debug(format, a...) DCCP_PR_DEBUG(ccid3_debug, format, ##a)
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2005-08-10 11:14:34 +08:00
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#else
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#define ccid3_pr_debug(format, a...)
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#endif
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2005-08-14 09:42:25 +08:00
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static struct dccp_tx_hist *ccid3_tx_hist;
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static struct dccp_rx_hist *ccid3_rx_hist;
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2005-08-10 11:14:34 +08:00
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2007-03-21 00:11:24 +08:00
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/*
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* Transmitter Half-Connection Routines
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*/
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2006-11-21 04:28:09 +08:00
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#ifdef CONFIG_IP_DCCP_CCID3_DEBUG
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2005-08-10 11:14:34 +08:00
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static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state)
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{
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static char *ccid3_state_names[] = {
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[TFRC_SSTATE_NO_SENT] = "NO_SENT",
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[TFRC_SSTATE_NO_FBACK] = "NO_FBACK",
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[TFRC_SSTATE_FBACK] = "FBACK",
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[TFRC_SSTATE_TERM] = "TERM",
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};
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return ccid3_state_names[state];
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}
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#endif
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2006-03-21 13:58:56 +08:00
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static void ccid3_hc_tx_set_state(struct sock *sk,
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enum ccid3_hc_tx_states state)
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2005-08-10 11:14:34 +08:00
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{
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2005-09-09 13:40:58 +08:00
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struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
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2005-08-10 11:14:34 +08:00
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enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state;
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ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
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2005-08-27 14:51:58 +08:00
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dccp_role(sk), sk, ccid3_tx_state_name(oldstate),
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ccid3_tx_state_name(state));
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2005-08-10 11:14:34 +08:00
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WARN_ON(state == oldstate);
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hctx->ccid3hctx_state = state;
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}
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2007-03-21 02:12:10 +08:00
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/*
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* Compute the initial sending rate X_init according to RFC 3390:
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* w_init = min(4 * MSS, max(2 * MSS, 4380 bytes))
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* X_init = w_init / RTT
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* For consistency with other parts of the code, X_init is scaled by 2^6.
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*/
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static inline u64 rfc3390_initial_rate(struct sock *sk)
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{
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const struct dccp_sock *dp = dccp_sk(sk);
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const __u32 w_init = min(4 * dp->dccps_mss_cache,
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max(2 * dp->dccps_mss_cache, 4380U));
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return scaled_div(w_init << 6, ccid3_hc_tx_sk(sk)->ccid3hctx_rtt);
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}
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2006-11-28 06:31:33 +08:00
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/*
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2007-03-21 01:56:11 +08:00
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* Recalculate t_ipi and delta (should be called whenever X changes)
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2006-11-28 06:31:33 +08:00
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*/
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2007-03-21 01:56:11 +08:00
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static inline void ccid3_update_send_interval(struct ccid3_hc_tx_sock *hctx)
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2005-08-10 11:14:34 +08:00
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{
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2006-12-10 10:02:12 +08:00
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/* Calculate new t_ipi = s / X_inst (X_inst is in 64 * bytes/second) */
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2007-04-21 04:02:55 +08:00
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hctx->ccid3hctx_t_ipi = scaled_div32(((u64)hctx->ccid3hctx_s) << 6,
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hctx->ccid3hctx_x);
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2005-08-10 11:14:34 +08:00
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2006-11-28 06:31:33 +08:00
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/* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */
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2005-08-27 14:51:58 +08:00
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hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2,
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TFRC_OPSYS_HALF_TIME_GRAN);
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2007-03-21 01:49:20 +08:00
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2007-03-21 02:04:30 +08:00
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ccid3_pr_debug("t_ipi=%u, delta=%u, s=%u, X=%u\n",
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2007-03-21 01:49:20 +08:00
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hctx->ccid3hctx_t_ipi, hctx->ccid3hctx_delta,
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2007-03-21 02:04:30 +08:00
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hctx->ccid3hctx_s, (unsigned)(hctx->ccid3hctx_x >> 6));
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2007-03-21 01:49:20 +08:00
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2005-08-10 11:14:34 +08:00
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}
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/*
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* Update X by
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* If (p > 0)
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2006-12-04 00:50:56 +08:00
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* X_calc = calcX(s, R, p);
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2005-08-10 11:14:34 +08:00
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* X = max(min(X_calc, 2 * X_recv), s / t_mbi);
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* Else
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* If (now - tld >= R)
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* X = max(min(2 * X, 2 * X_recv), s / R);
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* tld = now;
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2006-12-04 00:50:56 +08:00
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*
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2006-12-10 10:02:12 +08:00
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* Note: X and X_recv are both stored in units of 64 * bytes/second, to support
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* fine-grained resolution of sending rates. This requires scaling by 2^6
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* throughout the code. Only X_calc is unscaled (in bytes/second).
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*
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*/
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2006-11-29 05:51:42 +08:00
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static void ccid3_hc_tx_update_x(struct sock *sk, struct timeval *now)
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2005-08-10 11:14:34 +08:00
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{
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2005-09-09 13:40:58 +08:00
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struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
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2007-03-21 02:19:07 +08:00
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__u64 min_rate = 2 * hctx->ccid3hctx_x_recv;
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2006-12-10 10:02:12 +08:00
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const __u64 old_x = hctx->ccid3hctx_x;
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2005-08-10 11:14:34 +08:00
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2007-03-21 02:19:07 +08:00
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/*
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* Handle IDLE periods: do not reduce below RFC3390 initial sending rate
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* when idling [RFC 4342, 5.1]. See also draft-ietf-dccp-rfc3448bis.
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* For consistency with X and X_recv, min_rate is also scaled by 2^6.
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*/
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if (unlikely(hctx->ccid3hctx_idle)) {
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min_rate = rfc3390_initial_rate(sk);
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min_rate = max(min_rate, 2 * hctx->ccid3hctx_x_recv);
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}
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2006-12-04 00:53:07 +08:00
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if (hctx->ccid3hctx_p > 0) {
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2006-12-10 10:02:12 +08:00
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2006-12-10 10:24:57 +08:00
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hctx->ccid3hctx_x = min(((__u64)hctx->ccid3hctx_x_calc) << 6,
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2007-03-21 02:19:07 +08:00
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min_rate);
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2006-12-10 10:24:57 +08:00
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hctx->ccid3hctx_x = max(hctx->ccid3hctx_x,
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(((__u64)hctx->ccid3hctx_s) << 6) /
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2006-12-11 02:01:18 +08:00
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TFRC_T_MBI);
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2006-11-29 05:51:42 +08:00
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2006-12-10 10:03:51 +08:00
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} else if (timeval_delta(now, &hctx->ccid3hctx_t_ld) -
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2006-12-11 02:01:18 +08:00
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(suseconds_t)hctx->ccid3hctx_rtt >= 0) {
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2006-12-10 10:02:12 +08:00
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2006-12-10 10:24:57 +08:00
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hctx->ccid3hctx_x =
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2007-03-21 02:19:07 +08:00
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max(min(2 * hctx->ccid3hctx_x, min_rate),
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2006-12-10 10:24:57 +08:00
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scaled_div(((__u64)hctx->ccid3hctx_s) << 6,
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2006-12-11 02:01:18 +08:00
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hctx->ccid3hctx_rtt));
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2006-11-29 05:51:42 +08:00
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hctx->ccid3hctx_t_ld = *now;
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2006-12-10 10:00:14 +08:00
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}
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2005-08-28 05:18:18 +08:00
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2007-03-21 01:49:20 +08:00
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if (hctx->ccid3hctx_x != old_x) {
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2007-03-21 02:04:30 +08:00
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ccid3_pr_debug("X_prev=%u, X_now=%u, X_calc=%u, "
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"X_recv=%u\n", (unsigned)(old_x >> 6),
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(unsigned)(hctx->ccid3hctx_x >> 6),
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hctx->ccid3hctx_x_calc,
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(unsigned)(hctx->ccid3hctx_x_recv >> 6));
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2007-03-21 01:49:20 +08:00
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2007-03-21 01:56:11 +08:00
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ccid3_update_send_interval(hctx);
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2007-03-21 01:49:20 +08:00
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}
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2005-08-10 11:14:34 +08:00
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}
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2006-11-29 05:22:33 +08:00
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/*
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2006-12-11 02:01:18 +08:00
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* Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1)
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* @len: DCCP packet payload size in bytes
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2006-11-29 05:22:33 +08:00
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*/
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static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len)
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{
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2007-03-21 01:56:11 +08:00
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const u16 old_s = hctx->ccid3hctx_s;
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hctx->ccid3hctx_s = old_s == 0 ? len : (9 * old_s + len) / 10;
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if (hctx->ccid3hctx_s != old_s)
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ccid3_update_send_interval(hctx);
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2006-11-29 05:22:33 +08:00
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}
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2006-12-10 10:07:37 +08:00
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/*
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2006-12-11 02:01:18 +08:00
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* Update Window Counter using the algorithm from [RFC 4342, 8.1].
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* The algorithm is not applicable if RTT < 4 microseconds.
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2006-12-10 10:07:37 +08:00
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*/
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static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hctx,
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2007-06-17 00:34:02 +08:00
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ktime_t now)
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2006-12-10 10:07:37 +08:00
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{
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u32 quarter_rtts;
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if (unlikely(hctx->ccid3hctx_rtt < 4)) /* avoid divide-by-zero */
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return;
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2007-06-17 00:34:02 +08:00
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quarter_rtts = ktime_us_delta(now, hctx->ccid3hctx_t_last_win_count);
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quarter_rtts /= hctx->ccid3hctx_rtt / 4;
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2006-12-10 10:07:37 +08:00
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if (quarter_rtts > 0) {
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2007-06-17 00:34:02 +08:00
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hctx->ccid3hctx_t_last_win_count = now;
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2006-12-10 10:07:37 +08:00
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hctx->ccid3hctx_last_win_count += min_t(u32, quarter_rtts, 5);
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hctx->ccid3hctx_last_win_count &= 0xF; /* mod 16 */
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}
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}
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2005-08-10 11:14:34 +08:00
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static void ccid3_hc_tx_no_feedback_timer(unsigned long data)
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{
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struct sock *sk = (struct sock *)data;
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2005-09-09 13:40:58 +08:00
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struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
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2007-03-21 02:19:07 +08:00
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struct timeval now;
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2006-11-29 04:34:34 +08:00
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unsigned long t_nfb = USEC_PER_SEC / 5;
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2005-08-10 11:14:34 +08:00
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bh_lock_sock(sk);
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if (sock_owned_by_user(sk)) {
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/* Try again later. */
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/* XXX: set some sensible MIB */
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2006-11-28 06:29:27 +08:00
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goto restart_timer;
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2005-08-10 11:14:34 +08:00
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}
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2006-12-10 10:14:12 +08:00
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ccid3_pr_debug("%s(%p, state=%s) - entry \n", dccp_role(sk), sk,
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2005-08-10 11:14:34 +08:00
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ccid3_tx_state_name(hctx->ccid3hctx_state));
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2006-12-10 10:14:12 +08:00
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2007-03-21 02:19:07 +08:00
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hctx->ccid3hctx_idle = 1;
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2005-08-10 11:14:34 +08:00
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switch (hctx->ccid3hctx_state) {
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case TFRC_SSTATE_NO_FBACK:
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2006-11-29 05:51:42 +08:00
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/* RFC 3448, 4.4: Halve send rate directly */
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2006-12-10 10:24:57 +08:00
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hctx->ccid3hctx_x = max(hctx->ccid3hctx_x / 2,
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(((__u64)hctx->ccid3hctx_s) << 6) /
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TFRC_T_MBI);
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2005-08-10 11:14:34 +08:00
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2006-12-10 10:14:12 +08:00
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ccid3_pr_debug("%s(%p, state=%s), updated tx rate to %u "
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"bytes/s\n", dccp_role(sk), sk,
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2005-08-27 14:51:58 +08:00
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ccid3_tx_state_name(hctx->ccid3hctx_state),
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2006-12-10 10:02:12 +08:00
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(unsigned)(hctx->ccid3hctx_x >> 6));
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2006-11-28 06:29:27 +08:00
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/* The value of R is still undefined and so we can not recompute
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* the timout value. Keep initial value as per [RFC 4342, 5]. */
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2006-11-29 04:34:34 +08:00
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t_nfb = TFRC_INITIAL_TIMEOUT;
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2007-03-21 01:56:11 +08:00
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ccid3_update_send_interval(hctx);
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2005-08-10 11:14:34 +08:00
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break;
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case TFRC_SSTATE_FBACK:
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2005-08-27 14:51:58 +08:00
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/*
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2007-03-21 02:19:07 +08:00
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* Modify the cached value of X_recv [RFC 3448, 4.4]
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*
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* If (p == 0 || X_calc > 2 * X_recv)
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* X_recv = max(X_recv / 2, s / (2 * t_mbi));
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|
|
* Else
|
|
|
|
* X_recv = X_calc / 4;
|
|
|
|
*
|
|
|
|
* Note that X_recv is scaled by 2^6 while X_calc is not
|
2005-08-27 14:51:58 +08:00
|
|
|
*/
|
2007-03-21 02:19:07 +08:00
|
|
|
BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc);
|
|
|
|
|
|
|
|
if (hctx->ccid3hctx_p == 0 ||
|
|
|
|
(hctx->ccid3hctx_x_calc > (hctx->ccid3hctx_x_recv >> 5))) {
|
|
|
|
|
|
|
|
hctx->ccid3hctx_x_recv =
|
|
|
|
max(hctx->ccid3hctx_x_recv / 2,
|
|
|
|
(((__u64)hctx->ccid3hctx_s) << 6) /
|
|
|
|
(2 * TFRC_T_MBI));
|
|
|
|
|
|
|
|
if (hctx->ccid3hctx_p == 0)
|
|
|
|
dccp_timestamp(sk, &now);
|
|
|
|
} else {
|
|
|
|
hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc;
|
|
|
|
hctx->ccid3hctx_x_recv <<= 4;
|
2005-08-10 11:14:34 +08:00
|
|
|
}
|
2007-03-21 02:19:07 +08:00
|
|
|
/* Now recalculate X [RFC 3448, 4.3, step (4)] */
|
|
|
|
ccid3_hc_tx_update_x(sk, &now);
|
2005-08-28 07:11:28 +08:00
|
|
|
/*
|
|
|
|
* Schedule no feedback timer to expire in
|
2006-12-04 00:50:23 +08:00
|
|
|
* max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi)
|
|
|
|
* See comments in packet_recv() regarding the value of t_RTO.
|
2005-08-28 07:11:28 +08:00
|
|
|
*/
|
2006-12-04 00:50:23 +08:00
|
|
|
t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi);
|
2005-08-10 11:14:34 +08:00
|
|
|
break;
|
2006-11-21 04:39:23 +08:00
|
|
|
case TFRC_SSTATE_NO_SENT:
|
2006-12-10 10:14:12 +08:00
|
|
|
DCCP_BUG("%s(%p) - Illegal state NO_SENT", dccp_role(sk), sk);
|
2006-11-21 04:39:23 +08:00
|
|
|
/* fall through */
|
|
|
|
case TFRC_SSTATE_TERM:
|
2005-08-10 11:14:34 +08:00
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
2006-11-28 06:29:27 +08:00
|
|
|
restart_timer:
|
|
|
|
sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
|
2007-02-09 22:24:38 +08:00
|
|
|
jiffies + usecs_to_jiffies(t_nfb));
|
2005-08-10 11:14:34 +08:00
|
|
|
out:
|
|
|
|
bh_unlock_sock(sk);
|
|
|
|
sock_put(sk);
|
|
|
|
}
|
|
|
|
|
2006-11-27 22:26:03 +08:00
|
|
|
/*
|
|
|
|
* returns
|
|
|
|
* > 0: delay (in msecs) that should pass before actually sending
|
|
|
|
* = 0: can send immediately
|
|
|
|
* < 0: error condition; do not send packet
|
|
|
|
*/
|
2006-11-29 05:55:06 +08:00
|
|
|
static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb)
|
2005-08-10 11:14:34 +08:00
|
|
|
{
|
|
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
2005-09-09 13:40:58 +08:00
|
|
|
struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
|
2007-06-17 00:34:02 +08:00
|
|
|
ktime_t now = ktime_get_real();
|
|
|
|
s64 delay;
|
2005-08-10 11:14:34 +08:00
|
|
|
|
2006-11-21 04:39:23 +08:00
|
|
|
BUG_ON(hctx == NULL);
|
2005-08-27 14:51:58 +08:00
|
|
|
|
2005-08-10 11:14:34 +08:00
|
|
|
/*
|
2006-11-27 22:26:57 +08:00
|
|
|
* This function is called only for Data and DataAck packets. Sending
|
|
|
|
* zero-sized Data(Ack)s is theoretically possible, but for congestion
|
|
|
|
* control this case is pathological - ignore it.
|
2005-08-10 11:14:34 +08:00
|
|
|
*/
|
2006-11-29 05:55:06 +08:00
|
|
|
if (unlikely(skb->len == 0))
|
2006-11-27 22:26:57 +08:00
|
|
|
return -EBADMSG;
|
2005-08-10 11:14:34 +08:00
|
|
|
|
|
|
|
switch (hctx->ccid3hctx_state) {
|
|
|
|
case TFRC_SSTATE_NO_SENT:
|
2005-08-27 14:51:58 +08:00
|
|
|
sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
|
2006-12-11 02:01:18 +08:00
|
|
|
(jiffies +
|
2007-02-09 22:24:38 +08:00
|
|
|
usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)));
|
2005-08-10 11:14:34 +08:00
|
|
|
hctx->ccid3hctx_last_win_count = 0;
|
|
|
|
hctx->ccid3hctx_t_last_win_count = now;
|
2006-11-27 22:13:38 +08:00
|
|
|
|
|
|
|
/* Set t_0 for initial packet */
|
2005-08-10 11:14:34 +08:00
|
|
|
hctx->ccid3hctx_t_nom = now;
|
2007-03-21 02:31:56 +08:00
|
|
|
|
|
|
|
hctx->ccid3hctx_s = skb->len;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Use initial RTT sample when available: recommended by erratum
|
|
|
|
* to RFC 4342. This implements the initialisation procedure of
|
|
|
|
* draft rfc3448bis, section 4.2. Remember, X is scaled by 2^6.
|
|
|
|
*/
|
|
|
|
if (dp->dccps_syn_rtt) {
|
|
|
|
ccid3_pr_debug("SYN RTT = %uus\n", dp->dccps_syn_rtt);
|
|
|
|
hctx->ccid3hctx_rtt = dp->dccps_syn_rtt;
|
|
|
|
hctx->ccid3hctx_x = rfc3390_initial_rate(sk);
|
2007-06-17 00:34:02 +08:00
|
|
|
hctx->ccid3hctx_t_ld = ktime_to_timeval(now);
|
2007-03-21 02:31:56 +08:00
|
|
|
} else {
|
|
|
|
/* Sender does not have RTT sample: X = MSS/second */
|
|
|
|
hctx->ccid3hctx_x = dp->dccps_mss_cache;
|
|
|
|
hctx->ccid3hctx_x <<= 6;
|
|
|
|
}
|
|
|
|
ccid3_update_send_interval(hctx);
|
|
|
|
|
|
|
|
ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK);
|
2005-08-10 11:14:34 +08:00
|
|
|
break;
|
|
|
|
case TFRC_SSTATE_NO_FBACK:
|
|
|
|
case TFRC_SSTATE_FBACK:
|
2007-06-17 00:34:02 +08:00
|
|
|
delay = ktime_us_delta(hctx->ccid3hctx_t_nom, now);
|
2007-03-21 01:49:20 +08:00
|
|
|
ccid3_pr_debug("delay=%ld\n", (long)delay);
|
2006-11-27 22:25:10 +08:00
|
|
|
/*
|
2006-12-11 02:01:18 +08:00
|
|
|
* Scheduling of packet transmissions [RFC 3448, 4.6]
|
2006-11-27 22:25:10 +08:00
|
|
|
*
|
|
|
|
* if (t_now > t_nom - delta)
|
|
|
|
* // send the packet now
|
|
|
|
* else
|
|
|
|
* // send the packet in (t_nom - t_now) milliseconds.
|
|
|
|
*/
|
2007-06-17 00:48:50 +08:00
|
|
|
if (delay - (s64)hctx->ccid3hctx_delta >= 1000)
|
2007-06-17 00:34:02 +08:00
|
|
|
return (u32)delay / 1000L;
|
2006-12-10 10:07:37 +08:00
|
|
|
|
2007-06-17 00:34:02 +08:00
|
|
|
ccid3_hc_tx_update_win_count(hctx, now);
|
2005-08-10 11:14:34 +08:00
|
|
|
break;
|
2006-11-21 04:39:23 +08:00
|
|
|
case TFRC_SSTATE_TERM:
|
2006-12-10 10:14:12 +08:00
|
|
|
DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk);
|
2006-11-27 22:26:03 +08:00
|
|
|
return -EINVAL;
|
2005-08-10 11:14:34 +08:00
|
|
|
}
|
|
|
|
|
2006-11-27 22:26:03 +08:00
|
|
|
/* prepare to send now (add options etc.) */
|
|
|
|
dp->dccps_hc_tx_insert_options = 1;
|
2006-12-10 10:08:09 +08:00
|
|
|
DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count;
|
2007-03-21 02:19:07 +08:00
|
|
|
hctx->ccid3hctx_idle = 0;
|
2006-12-10 10:08:09 +08:00
|
|
|
|
|
|
|
/* set the nominal send time for the next following packet */
|
2007-06-17 00:34:02 +08:00
|
|
|
hctx->ccid3hctx_t_nom = ktime_add_us(hctx->ccid3hctx_t_nom,
|
|
|
|
hctx->ccid3hctx_t_ipi);
|
2006-11-27 22:26:03 +08:00
|
|
|
return 0;
|
2005-08-10 11:14:34 +08:00
|
|
|
}
|
|
|
|
|
2006-12-11 02:01:18 +08:00
|
|
|
static void ccid3_hc_tx_packet_sent(struct sock *sk, int more,
|
|
|
|
unsigned int len)
|
2005-08-10 11:14:34 +08:00
|
|
|
{
|
2005-09-09 13:40:58 +08:00
|
|
|
struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
|
2005-08-10 11:14:34 +08:00
|
|
|
struct timeval now;
|
2006-11-29 05:55:06 +08:00
|
|
|
struct dccp_tx_hist_entry *packet;
|
2005-08-10 11:14:34 +08:00
|
|
|
|
2006-11-21 04:39:23 +08:00
|
|
|
BUG_ON(hctx == NULL);
|
2005-08-10 11:14:34 +08:00
|
|
|
|
2006-11-29 05:55:06 +08:00
|
|
|
ccid3_hc_tx_update_s(hctx, len);
|
2005-08-10 11:14:34 +08:00
|
|
|
|
[DCCP] ccid3: Perform history operations only after packet has been sent
This migrates all packet history operations into the routine
ccid3_hc_tx_packet_sent, thereby removing synchronization problems
that occur when, as before, the operations are spread over multiple
routines.
The following minor simplifications are also applied:
* several simplifications now follow from this change - several tests
are now no longer required
* removal of one unnecessary variable (dp)
Justification:
Currently packet history operations span two different routines,
one of which is likely to pass through several iterations of sleeping
and awakening.
The first routine, ccid3_hc_tx_send_packet, allocates an entry and
sets a few fields. The remaining fields are filled in when the second
routine (which is not within a sleeping context), ccid3_hc_tx_packet_sent,
is called. This has several strong drawbacks:
* it is not necessary to split history operations - all fields can be
filled in by the second routine
* the first routine is called multiple times, until a packet can be sent,
and sleeps meanwhile - this causes a lot of difficulties with regard to
keeping the list consistent
* since both routines do not have a producer-consumer like synchronization,
it is very difficult to maintain data across calls to these routines
* the fact that the routines are called in different contexts (sleeping, not
sleeping) adds further problems
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2006-12-10 10:09:21 +08:00
|
|
|
packet = dccp_tx_hist_entry_new(ccid3_tx_hist, GFP_ATOMIC);
|
2006-11-29 05:55:06 +08:00
|
|
|
if (unlikely(packet == NULL)) {
|
[DCCP] ccid3: Perform history operations only after packet has been sent
This migrates all packet history operations into the routine
ccid3_hc_tx_packet_sent, thereby removing synchronization problems
that occur when, as before, the operations are spread over multiple
routines.
The following minor simplifications are also applied:
* several simplifications now follow from this change - several tests
are now no longer required
* removal of one unnecessary variable (dp)
Justification:
Currently packet history operations span two different routines,
one of which is likely to pass through several iterations of sleeping
and awakening.
The first routine, ccid3_hc_tx_send_packet, allocates an entry and
sets a few fields. The remaining fields are filled in when the second
routine (which is not within a sleeping context), ccid3_hc_tx_packet_sent,
is called. This has several strong drawbacks:
* it is not necessary to split history operations - all fields can be
filled in by the second routine
* the first routine is called multiple times, until a packet can be sent,
and sleeps meanwhile - this causes a lot of difficulties with regard to
keeping the list consistent
* since both routines do not have a producer-consumer like synchronization,
it is very difficult to maintain data across calls to these routines
* the fact that the routines are called in different contexts (sleeping, not
sleeping) adds further problems
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2006-12-10 10:09:21 +08:00
|
|
|
DCCP_CRIT("packet history - out of memory!");
|
2006-11-29 05:55:06 +08:00
|
|
|
return;
|
|
|
|
}
|
[DCCP] ccid3: Perform history operations only after packet has been sent
This migrates all packet history operations into the routine
ccid3_hc_tx_packet_sent, thereby removing synchronization problems
that occur when, as before, the operations are spread over multiple
routines.
The following minor simplifications are also applied:
* several simplifications now follow from this change - several tests
are now no longer required
* removal of one unnecessary variable (dp)
Justification:
Currently packet history operations span two different routines,
one of which is likely to pass through several iterations of sleeping
and awakening.
The first routine, ccid3_hc_tx_send_packet, allocates an entry and
sets a few fields. The remaining fields are filled in when the second
routine (which is not within a sleeping context), ccid3_hc_tx_packet_sent,
is called. This has several strong drawbacks:
* it is not necessary to split history operations - all fields can be
filled in by the second routine
* the first routine is called multiple times, until a packet can be sent,
and sleeps meanwhile - this causes a lot of difficulties with regard to
keeping the list consistent
* since both routines do not have a producer-consumer like synchronization,
it is very difficult to maintain data across calls to these routines
* the fact that the routines are called in different contexts (sleeping, not
sleeping) adds further problems
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2006-12-10 10:09:21 +08:00
|
|
|
dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, packet);
|
|
|
|
|
|
|
|
dccp_timestamp(sk, &now);
|
2006-11-29 05:55:06 +08:00
|
|
|
packet->dccphtx_tstamp = now;
|
[DCCP] ccid3: Perform history operations only after packet has been sent
This migrates all packet history operations into the routine
ccid3_hc_tx_packet_sent, thereby removing synchronization problems
that occur when, as before, the operations are spread over multiple
routines.
The following minor simplifications are also applied:
* several simplifications now follow from this change - several tests
are now no longer required
* removal of one unnecessary variable (dp)
Justification:
Currently packet history operations span two different routines,
one of which is likely to pass through several iterations of sleeping
and awakening.
The first routine, ccid3_hc_tx_send_packet, allocates an entry and
sets a few fields. The remaining fields are filled in when the second
routine (which is not within a sleeping context), ccid3_hc_tx_packet_sent,
is called. This has several strong drawbacks:
* it is not necessary to split history operations - all fields can be
filled in by the second routine
* the first routine is called multiple times, until a packet can be sent,
and sleeps meanwhile - this causes a lot of difficulties with regard to
keeping the list consistent
* since both routines do not have a producer-consumer like synchronization,
it is very difficult to maintain data across calls to these routines
* the fact that the routines are called in different contexts (sleeping, not
sleeping) adds further problems
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2006-12-10 10:09:21 +08:00
|
|
|
packet->dccphtx_seqno = dccp_sk(sk)->dccps_gss;
|
|
|
|
packet->dccphtx_rtt = hctx->ccid3hctx_rtt;
|
|
|
|
packet->dccphtx_sent = 1;
|
2005-08-10 11:14:34 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
|
|
|
|
{
|
2005-09-09 13:40:58 +08:00
|
|
|
struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
|
2005-08-10 11:14:34 +08:00
|
|
|
struct ccid3_options_received *opt_recv;
|
2005-08-10 23:59:38 +08:00
|
|
|
struct dccp_tx_hist_entry *packet;
|
2005-09-09 13:38:35 +08:00
|
|
|
struct timeval now;
|
2006-11-29 04:34:34 +08:00
|
|
|
unsigned long t_nfb;
|
2007-03-21 02:24:37 +08:00
|
|
|
u32 pinv, r_sample;
|
2005-08-27 14:51:58 +08:00
|
|
|
|
2006-11-21 04:39:23 +08:00
|
|
|
BUG_ON(hctx == NULL);
|
2005-08-10 11:14:34 +08:00
|
|
|
|
|
|
|
/* we are only interested in ACKs */
|
|
|
|
if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK ||
|
|
|
|
DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK))
|
|
|
|
return;
|
|
|
|
|
|
|
|
opt_recv = &hctx->ccid3hctx_options_received;
|
|
|
|
|
|
|
|
switch (hctx->ccid3hctx_state) {
|
|
|
|
case TFRC_SSTATE_NO_FBACK:
|
|
|
|
case TFRC_SSTATE_FBACK:
|
2006-12-04 00:50:56 +08:00
|
|
|
/* get packet from history to look up t_recvdata */
|
2005-08-10 23:59:38 +08:00
|
|
|
packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist,
|
2006-12-11 02:01:18 +08:00
|
|
|
DCCP_SKB_CB(skb)->dccpd_ack_seq);
|
2005-09-10 07:01:25 +08:00
|
|
|
if (unlikely(packet == NULL)) {
|
2006-12-04 00:50:56 +08:00
|
|
|
DCCP_WARN("%s(%p), seqno %llu(%s) doesn't exist "
|
2006-11-21 04:39:23 +08:00
|
|
|
"in history!\n", dccp_role(sk), sk,
|
2005-09-10 07:01:25 +08:00
|
|
|
(unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq,
|
2006-12-11 02:01:18 +08:00
|
|
|
dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type));
|
2005-08-10 11:14:34 +08:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2006-12-10 10:02:12 +08:00
|
|
|
/* Update receive rate in units of 64 * bytes/second */
|
2006-12-10 10:24:57 +08:00
|
|
|
hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate;
|
|
|
|
hctx->ccid3hctx_x_recv <<= 6;
|
2006-12-04 00:50:56 +08:00
|
|
|
|
|
|
|
/* Update loss event rate */
|
|
|
|
pinv = opt_recv->ccid3or_loss_event_rate;
|
2006-12-10 09:59:14 +08:00
|
|
|
if (pinv == ~0U || pinv == 0) /* see RFC 4342, 8.5 */
|
2006-12-04 00:50:56 +08:00
|
|
|
hctx->ccid3hctx_p = 0;
|
2006-12-10 09:59:14 +08:00
|
|
|
else /* can not exceed 100% */
|
2006-12-11 02:01:18 +08:00
|
|
|
hctx->ccid3hctx_p = 1000000 / pinv;
|
2006-12-04 00:50:56 +08:00
|
|
|
|
2005-09-09 13:38:35 +08:00
|
|
|
dccp_timestamp(sk, &now);
|
2006-12-04 00:50:56 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Calculate new round trip sample as per [RFC 3448, 4.3] by
|
2006-12-11 02:01:18 +08:00
|
|
|
* R_sample = (now - t_recvdata) - t_elapsed
|
2006-12-04 00:50:56 +08:00
|
|
|
*/
|
2007-03-21 02:24:37 +08:00
|
|
|
r_sample = dccp_sample_rtt(sk, &now, &packet->dccphtx_tstamp);
|
2006-12-04 00:50:56 +08:00
|
|
|
|
2007-03-21 02:24:37 +08:00
|
|
|
/*
|
|
|
|
* Update RTT estimate by
|
2005-08-10 11:14:34 +08:00
|
|
|
* If (No feedback recv)
|
|
|
|
* R = R_sample;
|
|
|
|
* Else
|
|
|
|
* R = q * R + (1 - q) * R_sample;
|
|
|
|
*
|
|
|
|
* q is a constant, RFC 3448 recomments 0.9
|
|
|
|
*/
|
|
|
|
if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) {
|
2006-12-10 10:02:12 +08:00
|
|
|
/*
|
|
|
|
* Larger Initial Windows [RFC 4342, sec. 5]
|
|
|
|
*/
|
2006-11-29 05:51:42 +08:00
|
|
|
hctx->ccid3hctx_rtt = r_sample;
|
2007-03-21 02:12:10 +08:00
|
|
|
hctx->ccid3hctx_x = rfc3390_initial_rate(sk);
|
2006-11-29 05:51:42 +08:00
|
|
|
hctx->ccid3hctx_t_ld = now;
|
|
|
|
|
2007-03-21 01:56:11 +08:00
|
|
|
ccid3_update_send_interval(hctx);
|
2005-08-10 11:14:34 +08:00
|
|
|
|
2007-03-21 02:12:10 +08:00
|
|
|
ccid3_pr_debug("%s(%p), s=%u, MSS=%u, "
|
2007-03-21 02:24:37 +08:00
|
|
|
"R_sample=%uus, X=%u\n", dccp_role(sk),
|
2007-02-06 10:18:21 +08:00
|
|
|
sk, hctx->ccid3hctx_s,
|
2007-05-24 08:43:11 +08:00
|
|
|
dccp_sk(sk)->dccps_mss_cache, r_sample,
|
2006-12-10 10:02:12 +08:00
|
|
|
(unsigned)(hctx->ccid3hctx_x >> 6));
|
2005-08-10 11:14:34 +08:00
|
|
|
|
2006-12-04 00:50:56 +08:00
|
|
|
ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK);
|
|
|
|
} else {
|
|
|
|
hctx->ccid3hctx_rtt = (9 * hctx->ccid3hctx_rtt +
|
2007-03-21 02:24:37 +08:00
|
|
|
r_sample) / 10;
|
2005-08-10 11:14:34 +08:00
|
|
|
|
2006-12-10 10:00:14 +08:00
|
|
|
/* Update sending rate (step 4 of [RFC 3448, 4.3]) */
|
|
|
|
if (hctx->ccid3hctx_p > 0)
|
|
|
|
hctx->ccid3hctx_x_calc =
|
|
|
|
tfrc_calc_x(hctx->ccid3hctx_s,
|
|
|
|
hctx->ccid3hctx_rtt,
|
|
|
|
hctx->ccid3hctx_p);
|
2006-12-04 00:50:56 +08:00
|
|
|
ccid3_hc_tx_update_x(sk, &now);
|
2005-08-10 11:14:34 +08:00
|
|
|
|
2007-03-21 02:24:37 +08:00
|
|
|
ccid3_pr_debug("%s(%p), RTT=%uus (sample=%uus), s=%u, "
|
2006-12-11 02:01:18 +08:00
|
|
|
"p=%u, X_calc=%u, X_recv=%u, X=%u\n",
|
|
|
|
dccp_role(sk),
|
2007-03-21 02:24:37 +08:00
|
|
|
sk, hctx->ccid3hctx_rtt, r_sample,
|
2006-12-04 00:50:56 +08:00
|
|
|
hctx->ccid3hctx_s, hctx->ccid3hctx_p,
|
|
|
|
hctx->ccid3hctx_x_calc,
|
2006-12-10 10:24:57 +08:00
|
|
|
(unsigned)(hctx->ccid3hctx_x_recv >> 6),
|
2006-12-11 02:01:18 +08:00
|
|
|
(unsigned)(hctx->ccid3hctx_x >> 6));
|
2005-08-10 11:14:34 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/* unschedule no feedback timer */
|
|
|
|
sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer);
|
|
|
|
|
|
|
|
/* remove all packets older than the one acked from history */
|
2005-08-10 23:59:38 +08:00
|
|
|
dccp_tx_hist_purge_older(ccid3_tx_hist,
|
|
|
|
&hctx->ccid3hctx_hist, packet);
|
2005-08-29 13:15:54 +08:00
|
|
|
/*
|
2006-12-11 02:01:18 +08:00
|
|
|
* As we have calculated new ipi, delta, t_nom it is possible
|
|
|
|
* that we now can send a packet, so wake up dccp_wait_for_ccid
|
2005-08-29 13:15:54 +08:00
|
|
|
*/
|
|
|
|
sk->sk_write_space(sk);
|
2005-08-10 23:59:38 +08:00
|
|
|
|
2006-12-04 00:50:23 +08:00
|
|
|
/*
|
|
|
|
* Update timeout interval for the nofeedback timer.
|
|
|
|
* We use a configuration option to increase the lower bound.
|
2006-12-11 02:01:18 +08:00
|
|
|
* This can help avoid triggering the nofeedback timer too
|
|
|
|
* often ('spinning') on LANs with small RTTs.
|
2006-12-04 00:50:23 +08:00
|
|
|
*/
|
2006-11-28 06:32:37 +08:00
|
|
|
hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt,
|
2006-12-04 00:50:23 +08:00
|
|
|
CONFIG_IP_DCCP_CCID3_RTO *
|
2006-12-11 02:01:18 +08:00
|
|
|
(USEC_PER_SEC/1000));
|
2005-08-27 14:51:58 +08:00
|
|
|
/*
|
|
|
|
* Schedule no feedback timer to expire in
|
2006-12-04 00:50:23 +08:00
|
|
|
* max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi)
|
2005-08-27 14:51:58 +08:00
|
|
|
*/
|
2006-12-04 00:50:23 +08:00
|
|
|
t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi);
|
2005-08-10 11:14:34 +08:00
|
|
|
|
2006-12-10 10:14:12 +08:00
|
|
|
ccid3_pr_debug("%s(%p), Scheduled no feedback timer to "
|
2006-12-11 02:01:18 +08:00
|
|
|
"expire in %lu jiffies (%luus)\n",
|
|
|
|
dccp_role(sk),
|
2006-12-10 10:14:12 +08:00
|
|
|
sk, usecs_to_jiffies(t_nfb), t_nfb);
|
|
|
|
|
|
|
|
sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
|
2006-11-29 04:34:34 +08:00
|
|
|
jiffies + usecs_to_jiffies(t_nfb));
|
2005-08-10 11:14:34 +08:00
|
|
|
|
|
|
|
/* set idle flag */
|
2006-12-10 10:04:43 +08:00
|
|
|
hctx->ccid3hctx_idle = 1;
|
2005-08-10 11:14:34 +08:00
|
|
|
break;
|
2007-03-08 04:53:48 +08:00
|
|
|
case TFRC_SSTATE_NO_SENT: /* fall through */
|
2006-11-27 22:28:48 +08:00
|
|
|
case TFRC_SSTATE_TERM: /* ignore feedback when closing */
|
2005-08-10 11:14:34 +08:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option,
|
2005-08-27 14:51:58 +08:00
|
|
|
unsigned char len, u16 idx,
|
|
|
|
unsigned char *value)
|
2005-08-10 11:14:34 +08:00
|
|
|
{
|
|
|
|
int rc = 0;
|
2005-09-09 13:40:58 +08:00
|
|
|
const struct dccp_sock *dp = dccp_sk(sk);
|
|
|
|
struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
|
2005-08-10 11:14:34 +08:00
|
|
|
struct ccid3_options_received *opt_recv;
|
|
|
|
|
2005-09-10 07:01:25 +08:00
|
|
|
BUG_ON(hctx == NULL);
|
2005-08-10 11:14:34 +08:00
|
|
|
|
|
|
|
opt_recv = &hctx->ccid3hctx_options_received;
|
|
|
|
|
|
|
|
if (opt_recv->ccid3or_seqno != dp->dccps_gsr) {
|
|
|
|
opt_recv->ccid3or_seqno = dp->dccps_gsr;
|
|
|
|
opt_recv->ccid3or_loss_event_rate = ~0;
|
|
|
|
opt_recv->ccid3or_loss_intervals_idx = 0;
|
|
|
|
opt_recv->ccid3or_loss_intervals_len = 0;
|
|
|
|
opt_recv->ccid3or_receive_rate = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
switch (option) {
|
|
|
|
case TFRC_OPT_LOSS_EVENT_RATE:
|
2005-09-10 07:01:25 +08:00
|
|
|
if (unlikely(len != 4)) {
|
2006-12-10 10:14:12 +08:00
|
|
|
DCCP_WARN("%s(%p), invalid len %d "
|
2006-11-21 04:39:23 +08:00
|
|
|
"for TFRC_OPT_LOSS_EVENT_RATE\n",
|
|
|
|
dccp_role(sk), sk, len);
|
2005-08-10 11:14:34 +08:00
|
|
|
rc = -EINVAL;
|
|
|
|
} else {
|
2006-12-11 02:01:18 +08:00
|
|
|
opt_recv->ccid3or_loss_event_rate =
|
|
|
|
ntohl(*(__be32 *)value);
|
2006-12-10 10:14:12 +08:00
|
|
|
ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n",
|
2005-08-10 11:14:34 +08:00
|
|
|
dccp_role(sk), sk,
|
|
|
|
opt_recv->ccid3or_loss_event_rate);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case TFRC_OPT_LOSS_INTERVALS:
|
|
|
|
opt_recv->ccid3or_loss_intervals_idx = idx;
|
|
|
|
opt_recv->ccid3or_loss_intervals_len = len;
|
2006-12-10 10:14:12 +08:00
|
|
|
ccid3_pr_debug("%s(%p), LOSS_INTERVALS=(%u, %u)\n",
|
2005-08-10 11:14:34 +08:00
|
|
|
dccp_role(sk), sk,
|
|
|
|
opt_recv->ccid3or_loss_intervals_idx,
|
|
|
|
opt_recv->ccid3or_loss_intervals_len);
|
|
|
|
break;
|
|
|
|
case TFRC_OPT_RECEIVE_RATE:
|
2005-09-10 07:01:25 +08:00
|
|
|
if (unlikely(len != 4)) {
|
2006-12-10 10:14:12 +08:00
|
|
|
DCCP_WARN("%s(%p), invalid len %d "
|
2006-11-21 04:39:23 +08:00
|
|
|
"for TFRC_OPT_RECEIVE_RATE\n",
|
|
|
|
dccp_role(sk), sk, len);
|
2005-08-10 11:14:34 +08:00
|
|
|
rc = -EINVAL;
|
|
|
|
} else {
|
2006-12-11 02:01:18 +08:00
|
|
|
opt_recv->ccid3or_receive_rate =
|
|
|
|
ntohl(*(__be32 *)value);
|
2006-12-10 10:14:12 +08:00
|
|
|
ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n",
|
2005-08-10 11:14:34 +08:00
|
|
|
dccp_role(sk), sk,
|
|
|
|
opt_recv->ccid3or_receive_rate);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2006-03-21 11:21:44 +08:00
|
|
|
static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk)
|
2005-08-10 11:14:34 +08:00
|
|
|
{
|
2006-03-21 11:21:44 +08:00
|
|
|
struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid);
|
2005-08-10 11:14:34 +08:00
|
|
|
|
2006-11-29 05:22:33 +08:00
|
|
|
hctx->ccid3hctx_s = 0;
|
2006-12-10 10:06:01 +08:00
|
|
|
hctx->ccid3hctx_rtt = 0;
|
2005-08-10 11:14:34 +08:00
|
|
|
hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT;
|
|
|
|
INIT_LIST_HEAD(&hctx->ccid3hctx_hist);
|
2006-03-21 09:35:13 +08:00
|
|
|
|
2006-12-11 02:01:18 +08:00
|
|
|
hctx->ccid3hctx_no_feedback_timer.function =
|
|
|
|
ccid3_hc_tx_no_feedback_timer;
|
2006-03-21 09:35:13 +08:00
|
|
|
hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk;
|
2005-08-10 11:14:34 +08:00
|
|
|
init_timer(&hctx->ccid3hctx_no_feedback_timer);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void ccid3_hc_tx_exit(struct sock *sk)
|
|
|
|
{
|
2005-09-09 13:40:58 +08:00
|
|
|
struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
|
2005-08-10 11:14:34 +08:00
|
|
|
|
|
|
|
BUG_ON(hctx == NULL);
|
|
|
|
|
|
|
|
ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM);
|
|
|
|
sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer);
|
|
|
|
|
|
|
|
/* Empty packet history */
|
2005-08-10 23:59:38 +08:00
|
|
|
dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist);
|
2005-08-10 11:14:34 +08:00
|
|
|
}
|
|
|
|
|
2007-03-21 00:11:24 +08:00
|
|
|
static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info)
|
|
|
|
{
|
|
|
|
const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
|
|
|
|
|
|
|
|
/* Listen socks doesn't have a private CCID block */
|
|
|
|
if (sk->sk_state == DCCP_LISTEN)
|
|
|
|
return;
|
|
|
|
|
|
|
|
BUG_ON(hctx == NULL);
|
|
|
|
|
|
|
|
info->tcpi_rto = hctx->ccid3hctx_t_rto;
|
|
|
|
info->tcpi_rtt = hctx->ccid3hctx_rtt;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len,
|
|
|
|
u32 __user *optval, int __user *optlen)
|
|
|
|
{
|
|
|
|
const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
|
|
|
|
const void *val;
|
|
|
|
|
|
|
|
/* Listen socks doesn't have a private CCID block */
|
|
|
|
if (sk->sk_state == DCCP_LISTEN)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
switch (optname) {
|
|
|
|
case DCCP_SOCKOPT_CCID_TX_INFO:
|
|
|
|
if (len < sizeof(hctx->ccid3hctx_tfrc))
|
|
|
|
return -EINVAL;
|
|
|
|
len = sizeof(hctx->ccid3hctx_tfrc);
|
|
|
|
val = &hctx->ccid3hctx_tfrc;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
return -ENOPROTOOPT;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (put_user(len, optlen) || copy_to_user(optval, val, len))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2005-08-10 11:14:34 +08:00
|
|
|
/*
|
2007-03-21 00:11:24 +08:00
|
|
|
* Receiver Half-Connection Routines
|
2005-08-10 11:14:34 +08:00
|
|
|
*/
|
2006-11-21 04:28:09 +08:00
|
|
|
#ifdef CONFIG_IP_DCCP_CCID3_DEBUG
|
2005-08-10 11:14:34 +08:00
|
|
|
static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state)
|
|
|
|
{
|
|
|
|
static char *ccid3_rx_state_names[] = {
|
|
|
|
[TFRC_RSTATE_NO_DATA] = "NO_DATA",
|
|
|
|
[TFRC_RSTATE_DATA] = "DATA",
|
|
|
|
[TFRC_RSTATE_TERM] = "TERM",
|
|
|
|
};
|
|
|
|
|
|
|
|
return ccid3_rx_state_names[state];
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2006-03-21 13:58:56 +08:00
|
|
|
static void ccid3_hc_rx_set_state(struct sock *sk,
|
|
|
|
enum ccid3_hc_rx_states state)
|
2005-08-10 11:14:34 +08:00
|
|
|
{
|
2005-09-09 13:40:58 +08:00
|
|
|
struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
|
2005-08-10 11:14:34 +08:00
|
|
|
enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state;
|
|
|
|
|
|
|
|
ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
|
2005-08-27 14:51:58 +08:00
|
|
|
dccp_role(sk), sk, ccid3_rx_state_name(oldstate),
|
|
|
|
ccid3_rx_state_name(state));
|
2005-08-10 11:14:34 +08:00
|
|
|
WARN_ON(state == oldstate);
|
|
|
|
hcrx->ccid3hcrx_state = state;
|
|
|
|
}
|
|
|
|
|
2006-11-29 05:22:33 +08:00
|
|
|
static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len)
|
|
|
|
{
|
|
|
|
if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */
|
|
|
|
ccid3_pr_debug("Packet payload length is 0 - not updating\n");
|
|
|
|
else
|
|
|
|
hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len :
|
|
|
|
(9 * hcrx->ccid3hcrx_s + len) / 10;
|
|
|
|
}
|
|
|
|
|
2005-08-10 11:14:34 +08:00
|
|
|
static void ccid3_hc_rx_send_feedback(struct sock *sk)
|
|
|
|
{
|
2005-09-09 13:40:58 +08:00
|
|
|
struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
|
2005-08-10 11:14:34 +08:00
|
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
2005-08-10 23:59:38 +08:00
|
|
|
struct dccp_rx_hist_entry *packet;
|
2005-08-28 05:18:18 +08:00
|
|
|
struct timeval now;
|
2006-12-10 10:03:51 +08:00
|
|
|
suseconds_t delta;
|
2005-08-10 11:14:34 +08:00
|
|
|
|
2006-12-10 10:14:12 +08:00
|
|
|
ccid3_pr_debug("%s(%p) - entry \n", dccp_role(sk), sk);
|
2005-08-10 11:14:34 +08:00
|
|
|
|
2005-09-09 13:38:35 +08:00
|
|
|
dccp_timestamp(sk, &now);
|
2005-08-28 05:18:18 +08:00
|
|
|
|
2005-08-10 11:14:34 +08:00
|
|
|
switch (hcrx->ccid3hcrx_state) {
|
|
|
|
case TFRC_RSTATE_NO_DATA:
|
|
|
|
hcrx->ccid3hcrx_x_recv = 0;
|
|
|
|
break;
|
2006-12-10 10:03:51 +08:00
|
|
|
case TFRC_RSTATE_DATA:
|
|
|
|
delta = timeval_delta(&now,
|
|
|
|
&hcrx->ccid3hcrx_tstamp_last_feedback);
|
|
|
|
DCCP_BUG_ON(delta < 0);
|
2006-12-10 10:02:51 +08:00
|
|
|
hcrx->ccid3hcrx_x_recv =
|
|
|
|
scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta);
|
2005-08-10 11:14:34 +08:00
|
|
|
break;
|
2006-11-21 04:39:23 +08:00
|
|
|
case TFRC_RSTATE_TERM:
|
2006-12-10 10:14:12 +08:00
|
|
|
DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk);
|
2005-08-10 11:14:34 +08:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2005-08-10 23:59:38 +08:00
|
|
|
packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist);
|
2005-09-10 07:01:25 +08:00
|
|
|
if (unlikely(packet == NULL)) {
|
2006-12-10 10:14:12 +08:00
|
|
|
DCCP_WARN("%s(%p), no data packet in history!\n",
|
2006-11-21 04:39:23 +08:00
|
|
|
dccp_role(sk), sk);
|
2005-08-10 11:14:34 +08:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2005-08-28 05:18:18 +08:00
|
|
|
hcrx->ccid3hcrx_tstamp_last_feedback = now;
|
2006-08-27 14:40:50 +08:00
|
|
|
hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval;
|
2005-08-10 11:14:34 +08:00
|
|
|
hcrx->ccid3hcrx_bytes_recv = 0;
|
|
|
|
|
2006-12-10 10:03:51 +08:00
|
|
|
/* Elapsed time information [RFC 4340, 13.2] in units of 10 * usecs */
|
|
|
|
delta = timeval_delta(&now, &packet->dccphrx_tstamp);
|
|
|
|
DCCP_BUG_ON(delta < 0);
|
|
|
|
hcrx->ccid3hcrx_elapsed_time = delta / 10;
|
2006-12-10 09:59:14 +08:00
|
|
|
|
2005-08-10 11:14:34 +08:00
|
|
|
if (hcrx->ccid3hcrx_p == 0)
|
2006-12-10 09:59:14 +08:00
|
|
|
hcrx->ccid3hcrx_pinv = ~0U; /* see RFC 4342, 8.5 */
|
|
|
|
else if (hcrx->ccid3hcrx_p > 1000000) {
|
|
|
|
DCCP_WARN("p (%u) > 100%%\n", hcrx->ccid3hcrx_p);
|
|
|
|
hcrx->ccid3hcrx_pinv = 1; /* use 100% in this case */
|
|
|
|
} else
|
2005-08-10 11:14:34 +08:00
|
|
|
hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p;
|
2006-12-10 09:59:14 +08:00
|
|
|
|
2005-09-09 13:30:07 +08:00
|
|
|
dp->dccps_hc_rx_insert_options = 1;
|
2005-08-10 11:14:34 +08:00
|
|
|
dccp_send_ack(sk);
|
|
|
|
}
|
|
|
|
|
2006-03-21 14:32:06 +08:00
|
|
|
static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb)
|
2005-08-10 11:14:34 +08:00
|
|
|
{
|
2005-09-10 07:01:25 +08:00
|
|
|
const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
|
2006-03-21 11:23:32 +08:00
|
|
|
__be32 x_recv, pinv;
|
2005-08-10 11:14:34 +08:00
|
|
|
|
2005-09-10 07:01:25 +08:00
|
|
|
BUG_ON(hcrx == NULL);
|
|
|
|
|
|
|
|
if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN))
|
2006-03-21 14:32:06 +08:00
|
|
|
return 0;
|
2005-08-10 11:14:34 +08:00
|
|
|
|
2006-08-27 14:40:50 +08:00
|
|
|
DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter;
|
2005-08-24 12:51:59 +08:00
|
|
|
|
|
|
|
if (dccp_packet_without_ack(skb))
|
2006-03-21 14:32:06 +08:00
|
|
|
return 0;
|
|
|
|
|
2005-08-24 12:51:59 +08:00
|
|
|
x_recv = htonl(hcrx->ccid3hcrx_x_recv);
|
|
|
|
pinv = htonl(hcrx->ccid3hcrx_pinv);
|
2006-03-21 14:32:06 +08:00
|
|
|
|
|
|
|
if ((hcrx->ccid3hcrx_elapsed_time != 0 &&
|
|
|
|
dccp_insert_option_elapsed_time(sk, skb,
|
|
|
|
hcrx->ccid3hcrx_elapsed_time)) ||
|
|
|
|
dccp_insert_option_timestamp(sk, skb) ||
|
|
|
|
dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE,
|
2006-12-11 02:01:18 +08:00
|
|
|
&pinv, sizeof(pinv)) ||
|
2006-03-21 14:32:06 +08:00
|
|
|
dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE,
|
2006-12-11 02:01:18 +08:00
|
|
|
&x_recv, sizeof(x_recv)))
|
2006-03-21 14:32:06 +08:00
|
|
|
return -1;
|
|
|
|
|
|
|
|
return 0;
|
2005-08-10 11:14:34 +08:00
|
|
|
}
|
|
|
|
|
2006-08-27 14:40:50 +08:00
|
|
|
static int ccid3_hc_rx_detect_loss(struct sock *sk,
|
2007-02-09 22:24:38 +08:00
|
|
|
struct dccp_rx_hist_entry *packet)
|
2005-08-10 11:14:34 +08:00
|
|
|
{
|
2005-09-09 13:40:58 +08:00
|
|
|
struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
|
2006-12-11 02:01:18 +08:00
|
|
|
struct dccp_rx_hist_entry *rx_hist =
|
|
|
|
dccp_rx_hist_head(&hcrx->ccid3hcrx_hist);
|
2006-08-27 14:40:50 +08:00
|
|
|
u64 seqno = packet->dccphrx_seqno;
|
|
|
|
u64 tmp_seqno;
|
|
|
|
int loss = 0;
|
|
|
|
u8 ccval;
|
|
|
|
|
|
|
|
|
|
|
|
tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss;
|
|
|
|
|
|
|
|
if (!rx_hist ||
|
|
|
|
follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) {
|
|
|
|
hcrx->ccid3hcrx_seqno_nonloss = seqno;
|
|
|
|
hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval;
|
|
|
|
goto detect_out;
|
|
|
|
}
|
|
|
|
|
2005-08-10 11:14:34 +08:00
|
|
|
|
2006-08-27 14:40:50 +08:00
|
|
|
while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno)
|
|
|
|
> TFRC_RECV_NUM_LATE_LOSS) {
|
|
|
|
loss = 1;
|
2007-05-29 05:53:08 +08:00
|
|
|
dccp_li_update_li(sk,
|
2007-06-15 04:41:28 +08:00
|
|
|
&hcrx->ccid3hcrx_li_hist,
|
|
|
|
&hcrx->ccid3hcrx_hist,
|
|
|
|
&hcrx->ccid3hcrx_tstamp_last_feedback,
|
|
|
|
hcrx->ccid3hcrx_s,
|
|
|
|
hcrx->ccid3hcrx_bytes_recv,
|
|
|
|
hcrx->ccid3hcrx_x_recv,
|
|
|
|
hcrx->ccid3hcrx_seqno_nonloss,
|
|
|
|
hcrx->ccid3hcrx_ccval_nonloss);
|
2006-08-27 14:40:50 +08:00
|
|
|
tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss;
|
|
|
|
dccp_inc_seqno(&tmp_seqno);
|
|
|
|
hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno;
|
|
|
|
dccp_inc_seqno(&tmp_seqno);
|
|
|
|
while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist,
|
|
|
|
tmp_seqno, &ccval)) {
|
2006-12-11 02:01:18 +08:00
|
|
|
hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno;
|
2006-08-27 14:40:50 +08:00
|
|
|
hcrx->ccid3hcrx_ccval_nonloss = ccval;
|
|
|
|
dccp_inc_seqno(&tmp_seqno);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* FIXME - this code could be simplified with above while */
|
|
|
|
/* but works at moment */
|
|
|
|
if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) {
|
|
|
|
hcrx->ccid3hcrx_seqno_nonloss = seqno;
|
|
|
|
hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval;
|
|
|
|
}
|
|
|
|
|
|
|
|
detect_out:
|
|
|
|
dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist,
|
|
|
|
&hcrx->ccid3hcrx_li_hist, packet,
|
|
|
|
hcrx->ccid3hcrx_seqno_nonloss);
|
|
|
|
return loss;
|
2005-08-10 11:14:34 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
|
|
|
|
{
|
2005-09-09 13:40:58 +08:00
|
|
|
struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
|
2005-08-24 12:51:59 +08:00
|
|
|
const struct dccp_options_received *opt_recv;
|
2005-08-10 23:59:38 +08:00
|
|
|
struct dccp_rx_hist_entry *packet;
|
2005-08-10 11:14:34 +08:00
|
|
|
struct timeval now;
|
2007-03-21 02:24:37 +08:00
|
|
|
u32 p_prev, r_sample, rtt_prev;
|
2006-11-29 05:22:33 +08:00
|
|
|
int loss, payload_size;
|
2005-08-27 14:51:58 +08:00
|
|
|
|
2006-11-21 04:39:23 +08:00
|
|
|
BUG_ON(hcrx == NULL);
|
2005-08-10 11:14:34 +08:00
|
|
|
|
2005-09-09 13:40:58 +08:00
|
|
|
opt_recv = &dccp_sk(sk)->dccps_options_received;
|
2005-08-24 12:51:59 +08:00
|
|
|
|
2005-08-10 11:14:34 +08:00
|
|
|
switch (DCCP_SKB_CB(skb)->dccpd_type) {
|
|
|
|
case DCCP_PKT_ACK:
|
|
|
|
if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA)
|
|
|
|
return;
|
|
|
|
case DCCP_PKT_DATAACK:
|
2005-08-24 12:51:59 +08:00
|
|
|
if (opt_recv->dccpor_timestamp_echo == 0)
|
2005-08-10 11:14:34 +08:00
|
|
|
break;
|
2006-08-27 14:40:50 +08:00
|
|
|
rtt_prev = hcrx->ccid3hcrx_rtt;
|
2005-09-09 13:38:35 +08:00
|
|
|
dccp_timestamp(sk, &now);
|
2007-03-21 02:24:37 +08:00
|
|
|
r_sample = dccp_sample_rtt(sk, &now, NULL);
|
2005-09-09 13:34:10 +08:00
|
|
|
|
|
|
|
if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA)
|
|
|
|
hcrx->ccid3hcrx_rtt = r_sample;
|
|
|
|
else
|
|
|
|
hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 +
|
|
|
|
r_sample / 10;
|
|
|
|
|
2006-08-27 14:40:50 +08:00
|
|
|
if (rtt_prev != hcrx->ccid3hcrx_rtt)
|
2006-12-10 10:14:12 +08:00
|
|
|
ccid3_pr_debug("%s(%p), New RTT=%uus, elapsed time=%u\n",
|
|
|
|
dccp_role(sk), sk, hcrx->ccid3hcrx_rtt,
|
2005-08-24 12:51:59 +08:00
|
|
|
opt_recv->dccpor_elapsed_time);
|
2005-08-10 11:14:34 +08:00
|
|
|
break;
|
|
|
|
case DCCP_PKT_DATA:
|
|
|
|
break;
|
2005-09-10 07:01:25 +08:00
|
|
|
default: /* We're not interested in other packet types, move along */
|
2005-08-10 11:14:34 +08:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2005-09-09 13:38:35 +08:00
|
|
|
packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp,
|
2006-12-07 12:33:16 +08:00
|
|
|
skb, GFP_ATOMIC);
|
2005-09-10 07:01:25 +08:00
|
|
|
if (unlikely(packet == NULL)) {
|
2006-12-10 10:14:12 +08:00
|
|
|
DCCP_WARN("%s(%p), Not enough mem to add rx packet "
|
2006-11-21 04:39:23 +08:00
|
|
|
"to history, consider it lost!\n", dccp_role(sk), sk);
|
2005-08-10 11:14:34 +08:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2006-08-27 14:40:50 +08:00
|
|
|
loss = ccid3_hc_rx_detect_loss(sk, packet);
|
2005-08-10 11:14:34 +08:00
|
|
|
|
|
|
|
if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK)
|
|
|
|
return;
|
|
|
|
|
2006-11-29 05:22:33 +08:00
|
|
|
payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4;
|
|
|
|
ccid3_hc_rx_update_s(hcrx, payload_size);
|
|
|
|
|
2005-08-10 11:14:34 +08:00
|
|
|
switch (hcrx->ccid3hcrx_state) {
|
|
|
|
case TFRC_RSTATE_NO_DATA:
|
2006-12-10 10:14:12 +08:00
|
|
|
ccid3_pr_debug("%s(%p, state=%s), skb=%p, sending initial "
|
|
|
|
"feedback\n", dccp_role(sk), sk,
|
2005-08-27 14:51:58 +08:00
|
|
|
dccp_state_name(sk->sk_state), skb);
|
2005-08-10 11:14:34 +08:00
|
|
|
ccid3_hc_rx_send_feedback(sk);
|
|
|
|
ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA);
|
|
|
|
return;
|
|
|
|
case TFRC_RSTATE_DATA:
|
2006-11-29 05:22:33 +08:00
|
|
|
hcrx->ccid3hcrx_bytes_recv += payload_size;
|
2006-08-27 14:40:50 +08:00
|
|
|
if (loss)
|
2005-08-28 05:18:18 +08:00
|
|
|
break;
|
|
|
|
|
2005-09-09 13:38:35 +08:00
|
|
|
dccp_timestamp(sk, &now);
|
2006-12-11 02:01:18 +08:00
|
|
|
if ((timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) -
|
|
|
|
(suseconds_t)hcrx->ccid3hcrx_rtt) >= 0) {
|
2005-08-28 05:18:18 +08:00
|
|
|
hcrx->ccid3hcrx_tstamp_last_ack = now;
|
|
|
|
ccid3_hc_rx_send_feedback(sk);
|
2005-08-10 11:14:34 +08:00
|
|
|
}
|
2005-08-28 05:18:18 +08:00
|
|
|
return;
|
2006-11-21 04:39:23 +08:00
|
|
|
case TFRC_RSTATE_TERM:
|
2006-12-10 10:14:12 +08:00
|
|
|
DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk);
|
2005-08-10 11:14:34 +08:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Dealing with packet loss */
|
2006-12-10 10:14:12 +08:00
|
|
|
ccid3_pr_debug("%s(%p, state=%s), data loss! Reacting...\n",
|
2005-08-24 12:51:59 +08:00
|
|
|
dccp_role(sk), sk, dccp_state_name(sk->sk_state));
|
2005-08-10 11:14:34 +08:00
|
|
|
|
|
|
|
p_prev = hcrx->ccid3hcrx_p;
|
2007-02-09 22:24:38 +08:00
|
|
|
|
2005-08-10 11:14:34 +08:00
|
|
|
/* Calculate loss event rate */
|
2006-03-04 09:54:46 +08:00
|
|
|
if (!list_empty(&hcrx->ccid3hcrx_li_hist)) {
|
|
|
|
u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist);
|
|
|
|
|
2005-08-10 11:14:34 +08:00
|
|
|
/* Scaling up by 1000000 as fixed decimal */
|
2006-03-04 09:54:46 +08:00
|
|
|
if (i_mean != 0)
|
|
|
|
hcrx->ccid3hcrx_p = 1000000 / i_mean;
|
2006-11-21 04:39:23 +08:00
|
|
|
} else
|
|
|
|
DCCP_BUG("empty loss history");
|
2005-08-10 11:14:34 +08:00
|
|
|
|
|
|
|
if (hcrx->ccid3hcrx_p > p_prev) {
|
|
|
|
ccid3_hc_rx_send_feedback(sk);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2006-03-21 11:21:44 +08:00
|
|
|
static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk)
|
2005-08-10 11:14:34 +08:00
|
|
|
{
|
2006-03-21 11:21:44 +08:00
|
|
|
struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid);
|
2005-08-10 11:14:34 +08:00
|
|
|
|
2006-12-10 10:14:12 +08:00
|
|
|
ccid3_pr_debug("entry\n");
|
2005-08-10 11:14:34 +08:00
|
|
|
|
|
|
|
hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA;
|
|
|
|
INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist);
|
2005-08-28 10:03:09 +08:00
|
|
|
INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist);
|
2005-09-09 13:38:35 +08:00
|
|
|
dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack);
|
2005-09-09 13:37:05 +08:00
|
|
|
hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack;
|
2006-11-29 05:22:33 +08:00
|
|
|
hcrx->ccid3hcrx_s = 0;
|
2006-12-10 10:06:01 +08:00
|
|
|
hcrx->ccid3hcrx_rtt = 0;
|
2005-08-10 11:14:34 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void ccid3_hc_rx_exit(struct sock *sk)
|
|
|
|
{
|
2005-09-09 13:40:58 +08:00
|
|
|
struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
|
2005-08-10 11:14:34 +08:00
|
|
|
|
2005-09-10 07:01:25 +08:00
|
|
|
BUG_ON(hcrx == NULL);
|
2005-08-10 11:14:34 +08:00
|
|
|
|
|
|
|
ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM);
|
|
|
|
|
|
|
|
/* Empty packet history */
|
2005-08-10 23:59:38 +08:00
|
|
|
dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist);
|
2005-08-10 11:14:34 +08:00
|
|
|
|
|
|
|
/* Empty loss interval history */
|
2007-05-29 05:53:08 +08:00
|
|
|
dccp_li_hist_purge(&hcrx->ccid3hcrx_li_hist);
|
2005-08-10 11:14:34 +08:00
|
|
|
}
|
|
|
|
|
[DCCP]: Introduce dccp_get_info
And also hc_tx and hc_rx get_info functions for the CCIDs to fill in
information that is specific to them.
For now reusing struct tcp_info, later I'll try to figure out a better
solution, for now its really nice to get this kind of info:
[root@qemu ~]# ./ss -danemi
State Recv-Q Send-Q Local Addr:Port Peer Addr:Port
LISTEN 0 0 *:5001 *:* ino:628 sk:c1340040
mem:(r0,w0,f0,t0) cwnd:0 ssthresh:0
ESTAB 0 0 172.20.0.2:5001 172.20.0.1:32785 ino:629 sk:c13409a0
mem:(r0,w0,f0,t0) ts rto:1000 rtt:0.004/0 cwnd:0 ssthresh:0 rcv_rtt:61.377
This, for instance, shows that we're not congestion controlling ACKs,
as the above output is in the ttcp receiving host, and ttcp is a one
way app, i.e. the received never calls sendmsg, so
ccid_hc_tx_send_packet is never called, so the TX half connection
stays in TFRC_SSTATE_NO_SENT state and hctx_rtt is never calculated,
stays with the value set in ccid3_hc_tx_init, 4us, as show above in
milliseconds (0.004ms), upcoming patches will fix this.
rcv_rtt seems sane tho, matching ping results :-)
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-24 12:52:35 +08:00
|
|
|
static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info)
|
|
|
|
{
|
2005-09-09 13:40:58 +08:00
|
|
|
const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
|
[DCCP]: Introduce dccp_get_info
And also hc_tx and hc_rx get_info functions for the CCIDs to fill in
information that is specific to them.
For now reusing struct tcp_info, later I'll try to figure out a better
solution, for now its really nice to get this kind of info:
[root@qemu ~]# ./ss -danemi
State Recv-Q Send-Q Local Addr:Port Peer Addr:Port
LISTEN 0 0 *:5001 *:* ino:628 sk:c1340040
mem:(r0,w0,f0,t0) cwnd:0 ssthresh:0
ESTAB 0 0 172.20.0.2:5001 172.20.0.1:32785 ino:629 sk:c13409a0
mem:(r0,w0,f0,t0) ts rto:1000 rtt:0.004/0 cwnd:0 ssthresh:0 rcv_rtt:61.377
This, for instance, shows that we're not congestion controlling ACKs,
as the above output is in the ttcp receiving host, and ttcp is a one
way app, i.e. the received never calls sendmsg, so
ccid_hc_tx_send_packet is never called, so the TX half connection
stays in TFRC_SSTATE_NO_SENT state and hctx_rtt is never calculated,
stays with the value set in ccid3_hc_tx_init, 4us, as show above in
milliseconds (0.004ms), upcoming patches will fix this.
rcv_rtt seems sane tho, matching ping results :-)
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-24 12:52:35 +08:00
|
|
|
|
2005-09-13 05:16:58 +08:00
|
|
|
/* Listen socks doesn't have a private CCID block */
|
|
|
|
if (sk->sk_state == DCCP_LISTEN)
|
|
|
|
return;
|
|
|
|
|
2005-09-10 07:01:25 +08:00
|
|
|
BUG_ON(hcrx == NULL);
|
[DCCP]: Introduce dccp_get_info
And also hc_tx and hc_rx get_info functions for the CCIDs to fill in
information that is specific to them.
For now reusing struct tcp_info, later I'll try to figure out a better
solution, for now its really nice to get this kind of info:
[root@qemu ~]# ./ss -danemi
State Recv-Q Send-Q Local Addr:Port Peer Addr:Port
LISTEN 0 0 *:5001 *:* ino:628 sk:c1340040
mem:(r0,w0,f0,t0) cwnd:0 ssthresh:0
ESTAB 0 0 172.20.0.2:5001 172.20.0.1:32785 ino:629 sk:c13409a0
mem:(r0,w0,f0,t0) ts rto:1000 rtt:0.004/0 cwnd:0 ssthresh:0 rcv_rtt:61.377
This, for instance, shows that we're not congestion controlling ACKs,
as the above output is in the ttcp receiving host, and ttcp is a one
way app, i.e. the received never calls sendmsg, so
ccid_hc_tx_send_packet is never called, so the TX half connection
stays in TFRC_SSTATE_NO_SENT state and hctx_rtt is never calculated,
stays with the value set in ccid3_hc_tx_init, 4us, as show above in
milliseconds (0.004ms), upcoming patches will fix this.
rcv_rtt seems sane tho, matching ping results :-)
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-24 12:52:35 +08:00
|
|
|
|
2006-12-11 02:01:18 +08:00
|
|
|
info->tcpi_ca_state = hcrx->ccid3hcrx_state;
|
|
|
|
info->tcpi_options |= TCPI_OPT_TIMESTAMPS;
|
|
|
|
info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt;
|
[DCCP]: Introduce dccp_get_info
And also hc_tx and hc_rx get_info functions for the CCIDs to fill in
information that is specific to them.
For now reusing struct tcp_info, later I'll try to figure out a better
solution, for now its really nice to get this kind of info:
[root@qemu ~]# ./ss -danemi
State Recv-Q Send-Q Local Addr:Port Peer Addr:Port
LISTEN 0 0 *:5001 *:* ino:628 sk:c1340040
mem:(r0,w0,f0,t0) cwnd:0 ssthresh:0
ESTAB 0 0 172.20.0.2:5001 172.20.0.1:32785 ino:629 sk:c13409a0
mem:(r0,w0,f0,t0) ts rto:1000 rtt:0.004/0 cwnd:0 ssthresh:0 rcv_rtt:61.377
This, for instance, shows that we're not congestion controlling ACKs,
as the above output is in the ttcp receiving host, and ttcp is a one
way app, i.e. the received never calls sendmsg, so
ccid_hc_tx_send_packet is never called, so the TX half connection
stays in TFRC_SSTATE_NO_SENT state and hctx_rtt is never calculated,
stays with the value set in ccid3_hc_tx_init, 4us, as show above in
milliseconds (0.004ms), upcoming patches will fix this.
rcv_rtt seems sane tho, matching ping results :-)
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-24 12:52:35 +08:00
|
|
|
}
|
|
|
|
|
2005-09-18 15:19:32 +08:00
|
|
|
static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len,
|
|
|
|
u32 __user *optval, int __user *optlen)
|
|
|
|
{
|
|
|
|
const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
|
|
|
|
const void *val;
|
2007-02-09 22:24:38 +08:00
|
|
|
|
2005-09-18 15:19:32 +08:00
|
|
|
/* Listen socks doesn't have a private CCID block */
|
|
|
|
if (sk->sk_state == DCCP_LISTEN)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
switch (optname) {
|
|
|
|
case DCCP_SOCKOPT_CCID_RX_INFO:
|
|
|
|
if (len < sizeof(hcrx->ccid3hcrx_tfrc))
|
|
|
|
return -EINVAL;
|
|
|
|
len = sizeof(hcrx->ccid3hcrx_tfrc);
|
|
|
|
val = &hcrx->ccid3hcrx_tfrc;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
return -ENOPROTOOPT;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (put_user(len, optlen) || copy_to_user(optval, val, len))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2006-03-21 11:21:44 +08:00
|
|
|
static struct ccid_operations ccid3 = {
|
2006-09-22 10:26:44 +08:00
|
|
|
.ccid_id = DCCPC_CCID3,
|
2005-08-10 11:14:34 +08:00
|
|
|
.ccid_name = "ccid3",
|
|
|
|
.ccid_owner = THIS_MODULE,
|
2006-03-21 11:21:44 +08:00
|
|
|
.ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock),
|
2005-08-10 11:14:34 +08:00
|
|
|
.ccid_hc_tx_init = ccid3_hc_tx_init,
|
|
|
|
.ccid_hc_tx_exit = ccid3_hc_tx_exit,
|
|
|
|
.ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet,
|
|
|
|
.ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent,
|
|
|
|
.ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv,
|
|
|
|
.ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options,
|
2006-03-21 11:21:44 +08:00
|
|
|
.ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock),
|
2005-08-10 11:14:34 +08:00
|
|
|
.ccid_hc_rx_init = ccid3_hc_rx_init,
|
|
|
|
.ccid_hc_rx_exit = ccid3_hc_rx_exit,
|
|
|
|
.ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options,
|
|
|
|
.ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv,
|
[DCCP]: Introduce dccp_get_info
And also hc_tx and hc_rx get_info functions for the CCIDs to fill in
information that is specific to them.
For now reusing struct tcp_info, later I'll try to figure out a better
solution, for now its really nice to get this kind of info:
[root@qemu ~]# ./ss -danemi
State Recv-Q Send-Q Local Addr:Port Peer Addr:Port
LISTEN 0 0 *:5001 *:* ino:628 sk:c1340040
mem:(r0,w0,f0,t0) cwnd:0 ssthresh:0
ESTAB 0 0 172.20.0.2:5001 172.20.0.1:32785 ino:629 sk:c13409a0
mem:(r0,w0,f0,t0) ts rto:1000 rtt:0.004/0 cwnd:0 ssthresh:0 rcv_rtt:61.377
This, for instance, shows that we're not congestion controlling ACKs,
as the above output is in the ttcp receiving host, and ttcp is a one
way app, i.e. the received never calls sendmsg, so
ccid_hc_tx_send_packet is never called, so the TX half connection
stays in TFRC_SSTATE_NO_SENT state and hctx_rtt is never calculated,
stays with the value set in ccid3_hc_tx_init, 4us, as show above in
milliseconds (0.004ms), upcoming patches will fix this.
rcv_rtt seems sane tho, matching ping results :-)
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-24 12:52:35 +08:00
|
|
|
.ccid_hc_rx_get_info = ccid3_hc_rx_get_info,
|
|
|
|
.ccid_hc_tx_get_info = ccid3_hc_tx_get_info,
|
2005-09-18 15:19:32 +08:00
|
|
|
.ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt,
|
|
|
|
.ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt,
|
2005-08-10 11:14:34 +08:00
|
|
|
};
|
2006-12-11 02:01:18 +08:00
|
|
|
|
2006-11-21 04:28:09 +08:00
|
|
|
#ifdef CONFIG_IP_DCCP_CCID3_DEBUG
|
2005-08-10 11:14:34 +08:00
|
|
|
module_param(ccid3_debug, int, 0444);
|
|
|
|
MODULE_PARM_DESC(ccid3_debug, "Enable debug messages");
|
2006-11-21 04:28:09 +08:00
|
|
|
#endif
|
2005-08-10 11:14:34 +08:00
|
|
|
|
|
|
|
static __init int ccid3_module_init(void)
|
|
|
|
{
|
2005-08-10 23:59:38 +08:00
|
|
|
int rc = -ENOBUFS;
|
2005-08-10 11:14:34 +08:00
|
|
|
|
2005-08-10 23:59:38 +08:00
|
|
|
ccid3_rx_hist = dccp_rx_hist_new("ccid3");
|
|
|
|
if (ccid3_rx_hist == NULL)
|
2005-08-10 11:14:34 +08:00
|
|
|
goto out;
|
|
|
|
|
2005-08-10 23:59:38 +08:00
|
|
|
ccid3_tx_hist = dccp_tx_hist_new("ccid3");
|
|
|
|
if (ccid3_tx_hist == NULL)
|
|
|
|
goto out_free_rx;
|
2005-08-10 11:14:34 +08:00
|
|
|
|
|
|
|
rc = ccid_register(&ccid3);
|
2006-12-11 02:01:18 +08:00
|
|
|
if (rc != 0)
|
2007-05-29 05:53:08 +08:00
|
|
|
goto out_free_tx;
|
2005-08-10 11:14:34 +08:00
|
|
|
out:
|
|
|
|
return rc;
|
2005-08-10 23:59:38 +08:00
|
|
|
|
|
|
|
out_free_tx:
|
|
|
|
dccp_tx_hist_delete(ccid3_tx_hist);
|
|
|
|
ccid3_tx_hist = NULL;
|
|
|
|
out_free_rx:
|
|
|
|
dccp_rx_hist_delete(ccid3_rx_hist);
|
|
|
|
ccid3_rx_hist = NULL;
|
2005-08-10 11:14:34 +08:00
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
module_init(ccid3_module_init);
|
|
|
|
|
|
|
|
static __exit void ccid3_module_exit(void)
|
|
|
|
{
|
|
|
|
ccid_unregister(&ccid3);
|
|
|
|
|
2005-08-10 23:59:38 +08:00
|
|
|
if (ccid3_tx_hist != NULL) {
|
|
|
|
dccp_tx_hist_delete(ccid3_tx_hist);
|
|
|
|
ccid3_tx_hist = NULL;
|
2005-08-10 11:14:34 +08:00
|
|
|
}
|
2005-08-10 23:59:38 +08:00
|
|
|
if (ccid3_rx_hist != NULL) {
|
|
|
|
dccp_rx_hist_delete(ccid3_rx_hist);
|
|
|
|
ccid3_rx_hist = NULL;
|
2005-08-10 11:14:34 +08:00
|
|
|
}
|
|
|
|
}
|
|
|
|
module_exit(ccid3_module_exit);
|
|
|
|
|
2006-08-27 10:01:30 +08:00
|
|
|
MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, "
|
2005-08-27 14:51:58 +08:00
|
|
|
"Arnaldo Carvalho de Melo <acme@ghostprotocols.net>");
|
2005-08-10 11:14:34 +08:00
|
|
|
MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_ALIAS("net-dccp-ccid-3");
|