2106 lines
58 KiB
C
2106 lines
58 KiB
C
/*
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* net/dccp/ccids/ccid3.c
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*
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* Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
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* Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.nz>
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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 <linux/config.h>
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#include "../ccid.h"
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#include "../dccp.h"
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#include "../packet_history.h"
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#include "ccid3.h"
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#ifdef CCID3_DEBUG
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extern int ccid3_debug;
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#define ccid3_pr_debug(format, a...) \
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do { if (ccid3_debug) \
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printk(KERN_DEBUG "%s: " format, __FUNCTION__, ##a); \
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} while (0)
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#else
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#define ccid3_pr_debug(format, a...)
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#endif
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#define TFRC_MIN_PACKET_SIZE 16
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#define TFRC_STD_PACKET_SIZE 256
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#define TFRC_MAX_PACKET_SIZE 65535
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#define TFRC_INITIAL_TIMEOUT (2 * USEC_PER_SEC)
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/* two seconds as per CCID3 spec 11 */
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#define TFRC_OPSYS_HALF_TIME_GRAN (USEC_PER_SEC / (2 * HZ))
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/* above is in usecs - half the scheduling granularity as per RFC3448 4.6 */
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#define TFRC_WIN_COUNT_PER_RTT 4
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#define TFRC_WIN_COUNT_LIMIT 16
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#define TFRC_MAX_BACK_OFF_TIME 64
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/* above is in seconds */
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#define TFRC_SMALLEST_P 40
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#define TFRC_RECV_IVAL_F_LENGTH 8 /* length(w[]) */
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/* Number of later packets received before one is considered lost */
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#define TFRC_RECV_NUM_LATE_LOSS 3
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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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static int ccid3_debug;
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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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static kmem_cache_t *ccid3_loss_interval_hist_slab;
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static inline struct ccid3_loss_interval_hist_entry *
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ccid3_loss_interval_hist_entry_new(const unsigned int __nocast prio)
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{
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return kmem_cache_alloc(ccid3_loss_interval_hist_slab, prio);
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}
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static inline void ccid3_loss_interval_hist_entry_delete(struct ccid3_loss_interval_hist_entry *entry)
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{
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if (entry != NULL)
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kmem_cache_free(ccid3_loss_interval_hist_slab, entry);
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}
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static void ccid3_loss_interval_history_delete(struct list_head *hist)
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{
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struct ccid3_loss_interval_hist_entry *entry, *next;
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list_for_each_entry_safe(entry, next, hist, ccid3lih_node) {
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list_del_init(&entry->ccid3lih_node);
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kmem_cache_free(ccid3_loss_interval_hist_slab, entry);
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}
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}
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static int ccid3_init(struct sock *sk)
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{
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ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
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return 0;
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}
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static void ccid3_exit(struct sock *sk)
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{
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ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
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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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TFRC_SSTATE_TERM,
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};
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#ifdef CCID3_DEBUG
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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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static inline void ccid3_hc_tx_set_state(struct sock *sk, enum ccid3_hc_tx_states state)
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{
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struct dccp_sock *dp = dccp_sk(sk);
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struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
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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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dccp_role(sk), sk, ccid3_tx_state_name(oldstate), ccid3_tx_state_name(state));
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WARN_ON(state == oldstate);
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hctx->ccid3hctx_state = state;
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}
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static void timeval_sub(struct timeval large, struct timeval small,
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struct timeval *result)
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{
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result->tv_sec = large.tv_sec-small.tv_sec;
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if (large.tv_usec < small.tv_usec) {
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(result->tv_sec)--;
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result->tv_usec = USEC_PER_SEC +
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large.tv_usec - small.tv_usec;
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} else
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result->tv_usec = large.tv_usec-small.tv_usec;
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}
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static inline void timeval_fix(struct timeval *tv)
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{
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if (tv->tv_usec >= USEC_PER_SEC) {
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tv->tv_sec++;
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tv->tv_usec -= USEC_PER_SEC;
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}
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}
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#define CALCX_ARRSIZE 500
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#define CALCX_SPLIT 50000
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/* equivalent to 0.05 */
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static const u32 calcx_lookup[CALCX_ARRSIZE][2] = {
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{ 37172 , 8172 },
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{ 53499 , 11567 },
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|
{ 66664 , 14180 },
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|
{ 78298 , 16388 },
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|
{ 89021 , 18339 },
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|
{ 99147 , 20108 },
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|
{ 108858 , 21738 },
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|
{ 118273 , 23260 },
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|
{ 127474 , 24693 },
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|
{ 136520 , 26052 },
|
|
{ 145456 , 27348 },
|
|
{ 154316 , 28589 },
|
|
{ 163130 , 29783 },
|
|
{ 171919 , 30935 },
|
|
{ 180704 , 32049 },
|
|
{ 189502 , 33130 },
|
|
{ 198328 , 34180 },
|
|
{ 207194 , 35202 },
|
|
{ 216114 , 36198 },
|
|
{ 225097 , 37172 },
|
|
{ 234153 , 38123 },
|
|
{ 243294 , 39055 },
|
|
{ 252527 , 39968 },
|
|
{ 261861 , 40864 },
|
|
{ 271305 , 41743 },
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|
{ 280866 , 42607 },
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|
{ 290553 , 43457 },
|
|
{ 300372 , 44293 },
|
|
{ 310333 , 45117 },
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|
{ 320441 , 45929 },
|
|
{ 330705 , 46729 },
|
|
{ 341131 , 47518 },
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|
{ 351728 , 48297 },
|
|
{ 362501 , 49066 },
|
|
{ 373460 , 49826 },
|
|
{ 384609 , 50577 },
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|
{ 395958 , 51320 },
|
|
{ 407513 , 52054 },
|
|
{ 419281 , 52780 },
|
|
{ 431270 , 53499 },
|
|
{ 443487 , 54211 },
|
|
{ 455940 , 54916 },
|
|
{ 468635 , 55614 },
|
|
{ 481581 , 56306 },
|
|
{ 494785 , 56991 },
|
|
{ 508254 , 57671 },
|
|
{ 521996 , 58345 },
|
|
{ 536019 , 59014 },
|
|
{ 550331 , 59677 },
|
|
{ 564939 , 60335 },
|
|
{ 579851 , 60988 },
|
|
{ 595075 , 61636 },
|
|
{ 610619 , 62279 },
|
|
{ 626491 , 62918 },
|
|
{ 642700 , 63553 },
|
|
{ 659253 , 64183 },
|
|
{ 676158 , 64809 },
|
|
{ 693424 , 65431 },
|
|
{ 711060 , 66050 },
|
|
{ 729073 , 66664 },
|
|
{ 747472 , 67275 },
|
|
{ 766266 , 67882 },
|
|
{ 785464 , 68486 },
|
|
{ 805073 , 69087 },
|
|
{ 825103 , 69684 },
|
|
{ 845562 , 70278 },
|
|
{ 866460 , 70868 },
|
|
{ 887805 , 71456 },
|
|
{ 909606 , 72041 },
|
|
{ 931873 , 72623 },
|
|
{ 954614 , 73202 },
|
|
{ 977839 , 73778 },
|
|
{ 1001557 , 74352 },
|
|
{ 1025777 , 74923 },
|
|
{ 1050508 , 75492 },
|
|
{ 1075761 , 76058 },
|
|
{ 1101544 , 76621 },
|
|
{ 1127867 , 77183 },
|
|
{ 1154739 , 77741 },
|
|
{ 1182172 , 78298 },
|
|
{ 1210173 , 78852 },
|
|
{ 1238753 , 79405 },
|
|
{ 1267922 , 79955 },
|
|
{ 1297689 , 80503 },
|
|
{ 1328066 , 81049 },
|
|
{ 1359060 , 81593 },
|
|
{ 1390684 , 82135 },
|
|
{ 1422947 , 82675 },
|
|
{ 1455859 , 83213 },
|
|
{ 1489430 , 83750 },
|
|
{ 1523671 , 84284 },
|
|
{ 1558593 , 84817 },
|
|
{ 1594205 , 85348 },
|
|
{ 1630518 , 85878 },
|
|
{ 1667543 , 86406 },
|
|
{ 1705290 , 86932 },
|
|
{ 1743770 , 87457 },
|
|
{ 1782994 , 87980 },
|
|
{ 1822973 , 88501 },
|
|
{ 1863717 , 89021 },
|
|
{ 1905237 , 89540 },
|
|
{ 1947545 , 90057 },
|
|
{ 1990650 , 90573 },
|
|
{ 2034566 , 91087 },
|
|
{ 2079301 , 91600 },
|
|
{ 2124869 , 92111 },
|
|
{ 2171279 , 92622 },
|
|
{ 2218543 , 93131 },
|
|
{ 2266673 , 93639 },
|
|
{ 2315680 , 94145 },
|
|
{ 2365575 , 94650 },
|
|
{ 2416371 , 95154 },
|
|
{ 2468077 , 95657 },
|
|
{ 2520707 , 96159 },
|
|
{ 2574271 , 96660 },
|
|
{ 2628782 , 97159 },
|
|
{ 2684250 , 97658 },
|
|
{ 2740689 , 98155 },
|
|
{ 2798110 , 98651 },
|
|
{ 2856524 , 99147 },
|
|
{ 2915944 , 99641 },
|
|
{ 2976382 , 100134 },
|
|
{ 3037850 , 100626 },
|
|
{ 3100360 , 101117 },
|
|
{ 3163924 , 101608 },
|
|
{ 3228554 , 102097 },
|
|
{ 3294263 , 102586 },
|
|
{ 3361063 , 103073 },
|
|
{ 3428966 , 103560 },
|
|
{ 3497984 , 104045 },
|
|
{ 3568131 , 104530 },
|
|
{ 3639419 , 105014 },
|
|
{ 3711860 , 105498 },
|
|
{ 3785467 , 105980 },
|
|
{ 3860253 , 106462 },
|
|
{ 3936229 , 106942 },
|
|
{ 4013410 , 107422 },
|
|
{ 4091808 , 107902 },
|
|
{ 4171435 , 108380 },
|
|
{ 4252306 , 108858 },
|
|
{ 4334431 , 109335 },
|
|
{ 4417825 , 109811 },
|
|
{ 4502501 , 110287 },
|
|
{ 4588472 , 110762 },
|
|
{ 4675750 , 111236 },
|
|
{ 4764349 , 111709 },
|
|
{ 4854283 , 112182 },
|
|
{ 4945564 , 112654 },
|
|
{ 5038206 , 113126 },
|
|
{ 5132223 , 113597 },
|
|
{ 5227627 , 114067 },
|
|
{ 5324432 , 114537 },
|
|
{ 5422652 , 115006 },
|
|
{ 5522299 , 115474 },
|
|
{ 5623389 , 115942 },
|
|
{ 5725934 , 116409 },
|
|
{ 5829948 , 116876 },
|
|
{ 5935446 , 117342 },
|
|
{ 6042439 , 117808 },
|
|
{ 6150943 , 118273 },
|
|
{ 6260972 , 118738 },
|
|
{ 6372538 , 119202 },
|
|
{ 6485657 , 119665 },
|
|
{ 6600342 , 120128 },
|
|
{ 6716607 , 120591 },
|
|
{ 6834467 , 121053 },
|
|
{ 6953935 , 121514 },
|
|
{ 7075025 , 121976 },
|
|
{ 7197752 , 122436 },
|
|
{ 7322131 , 122896 },
|
|
{ 7448175 , 123356 },
|
|
{ 7575898 , 123815 },
|
|
{ 7705316 , 124274 },
|
|
{ 7836442 , 124733 },
|
|
{ 7969291 , 125191 },
|
|
{ 8103877 , 125648 },
|
|
{ 8240216 , 126105 },
|
|
{ 8378321 , 126562 },
|
|
{ 8518208 , 127018 },
|
|
{ 8659890 , 127474 },
|
|
{ 8803384 , 127930 },
|
|
{ 8948702 , 128385 },
|
|
{ 9095861 , 128840 },
|
|
{ 9244875 , 129294 },
|
|
{ 9395760 , 129748 },
|
|
{ 9548529 , 130202 },
|
|
{ 9703198 , 130655 },
|
|
{ 9859782 , 131108 },
|
|
{ 10018296 , 131561 },
|
|
{ 10178755 , 132014 },
|
|
{ 10341174 , 132466 },
|
|
{ 10505569 , 132917 },
|
|
{ 10671954 , 133369 },
|
|
{ 10840345 , 133820 },
|
|
{ 11010757 , 134271 },
|
|
{ 11183206 , 134721 },
|
|
{ 11357706 , 135171 },
|
|
{ 11534274 , 135621 },
|
|
{ 11712924 , 136071 },
|
|
{ 11893673 , 136520 },
|
|
{ 12076536 , 136969 },
|
|
{ 12261527 , 137418 },
|
|
{ 12448664 , 137867 },
|
|
{ 12637961 , 138315 },
|
|
{ 12829435 , 138763 },
|
|
{ 13023101 , 139211 },
|
|
{ 13218974 , 139658 },
|
|
{ 13417071 , 140106 },
|
|
{ 13617407 , 140553 },
|
|
{ 13819999 , 140999 },
|
|
{ 14024862 , 141446 },
|
|
{ 14232012 , 141892 },
|
|
{ 14441465 , 142339 },
|
|
{ 14653238 , 142785 },
|
|
{ 14867346 , 143230 },
|
|
{ 15083805 , 143676 },
|
|
{ 15302632 , 144121 },
|
|
{ 15523842 , 144566 },
|
|
{ 15747453 , 145011 },
|
|
{ 15973479 , 145456 },
|
|
{ 16201939 , 145900 },
|
|
{ 16432847 , 146345 },
|
|
{ 16666221 , 146789 },
|
|
{ 16902076 , 147233 },
|
|
{ 17140429 , 147677 },
|
|
{ 17381297 , 148121 },
|
|
{ 17624696 , 148564 },
|
|
{ 17870643 , 149007 },
|
|
{ 18119154 , 149451 },
|
|
{ 18370247 , 149894 },
|
|
{ 18623936 , 150336 },
|
|
{ 18880241 , 150779 },
|
|
{ 19139176 , 151222 },
|
|
{ 19400759 , 151664 },
|
|
{ 19665007 , 152107 },
|
|
{ 19931936 , 152549 },
|
|
{ 20201564 , 152991 },
|
|
{ 20473907 , 153433 },
|
|
{ 20748982 , 153875 },
|
|
{ 21026807 , 154316 },
|
|
{ 21307399 , 154758 },
|
|
{ 21590773 , 155199 },
|
|
{ 21876949 , 155641 },
|
|
{ 22165941 , 156082 },
|
|
{ 22457769 , 156523 },
|
|
{ 22752449 , 156964 },
|
|
{ 23049999 , 157405 },
|
|
{ 23350435 , 157846 },
|
|
{ 23653774 , 158287 },
|
|
{ 23960036 , 158727 },
|
|
{ 24269236 , 159168 },
|
|
{ 24581392 , 159608 },
|
|
{ 24896521 , 160049 },
|
|
{ 25214642 , 160489 },
|
|
{ 25535772 , 160929 },
|
|
{ 25859927 , 161370 },
|
|
{ 26187127 , 161810 },
|
|
{ 26517388 , 162250 },
|
|
{ 26850728 , 162690 },
|
|
{ 27187165 , 163130 },
|
|
{ 27526716 , 163569 },
|
|
{ 27869400 , 164009 },
|
|
{ 28215234 , 164449 },
|
|
{ 28564236 , 164889 },
|
|
{ 28916423 , 165328 },
|
|
{ 29271815 , 165768 },
|
|
{ 29630428 , 166208 },
|
|
{ 29992281 , 166647 },
|
|
{ 30357392 , 167087 },
|
|
{ 30725779 , 167526 },
|
|
{ 31097459 , 167965 },
|
|
{ 31472452 , 168405 },
|
|
{ 31850774 , 168844 },
|
|
{ 32232445 , 169283 },
|
|
{ 32617482 , 169723 },
|
|
{ 33005904 , 170162 },
|
|
{ 33397730 , 170601 },
|
|
{ 33792976 , 171041 },
|
|
{ 34191663 , 171480 },
|
|
{ 34593807 , 171919 },
|
|
{ 34999428 , 172358 },
|
|
{ 35408544 , 172797 },
|
|
{ 35821174 , 173237 },
|
|
{ 36237335 , 173676 },
|
|
{ 36657047 , 174115 },
|
|
{ 37080329 , 174554 },
|
|
{ 37507197 , 174993 },
|
|
{ 37937673 , 175433 },
|
|
{ 38371773 , 175872 },
|
|
{ 38809517 , 176311 },
|
|
{ 39250924 , 176750 },
|
|
{ 39696012 , 177190 },
|
|
{ 40144800 , 177629 },
|
|
{ 40597308 , 178068 },
|
|
{ 41053553 , 178507 },
|
|
{ 41513554 , 178947 },
|
|
{ 41977332 , 179386 },
|
|
{ 42444904 , 179825 },
|
|
{ 42916290 , 180265 },
|
|
{ 43391509 , 180704 },
|
|
{ 43870579 , 181144 },
|
|
{ 44353520 , 181583 },
|
|
{ 44840352 , 182023 },
|
|
{ 45331092 , 182462 },
|
|
{ 45825761 , 182902 },
|
|
{ 46324378 , 183342 },
|
|
{ 46826961 , 183781 },
|
|
{ 47333531 , 184221 },
|
|
{ 47844106 , 184661 },
|
|
{ 48358706 , 185101 },
|
|
{ 48877350 , 185541 },
|
|
{ 49400058 , 185981 },
|
|
{ 49926849 , 186421 },
|
|
{ 50457743 , 186861 },
|
|
{ 50992759 , 187301 },
|
|
{ 51531916 , 187741 },
|
|
{ 52075235 , 188181 },
|
|
{ 52622735 , 188622 },
|
|
{ 53174435 , 189062 },
|
|
{ 53730355 , 189502 },
|
|
{ 54290515 , 189943 },
|
|
{ 54854935 , 190383 },
|
|
{ 55423634 , 190824 },
|
|
{ 55996633 , 191265 },
|
|
{ 56573950 , 191706 },
|
|
{ 57155606 , 192146 },
|
|
{ 57741621 , 192587 },
|
|
{ 58332014 , 193028 },
|
|
{ 58926806 , 193470 },
|
|
{ 59526017 , 193911 },
|
|
{ 60129666 , 194352 },
|
|
{ 60737774 , 194793 },
|
|
{ 61350361 , 195235 },
|
|
{ 61967446 , 195677 },
|
|
{ 62589050 , 196118 },
|
|
{ 63215194 , 196560 },
|
|
{ 63845897 , 197002 },
|
|
{ 64481179 , 197444 },
|
|
{ 65121061 , 197886 },
|
|
{ 65765563 , 198328 },
|
|
{ 66414705 , 198770 },
|
|
{ 67068508 , 199213 },
|
|
{ 67726992 , 199655 },
|
|
{ 68390177 , 200098 },
|
|
{ 69058085 , 200540 },
|
|
{ 69730735 , 200983 },
|
|
{ 70408147 , 201426 },
|
|
{ 71090343 , 201869 },
|
|
{ 71777343 , 202312 },
|
|
{ 72469168 , 202755 },
|
|
{ 73165837 , 203199 },
|
|
{ 73867373 , 203642 },
|
|
{ 74573795 , 204086 },
|
|
{ 75285124 , 204529 },
|
|
{ 76001380 , 204973 },
|
|
{ 76722586 , 205417 },
|
|
{ 77448761 , 205861 },
|
|
{ 78179926 , 206306 },
|
|
{ 78916102 , 206750 },
|
|
{ 79657310 , 207194 },
|
|
{ 80403571 , 207639 },
|
|
{ 81154906 , 208084 },
|
|
{ 81911335 , 208529 },
|
|
{ 82672880 , 208974 },
|
|
{ 83439562 , 209419 },
|
|
{ 84211402 , 209864 },
|
|
{ 84988421 , 210309 },
|
|
{ 85770640 , 210755 },
|
|
{ 86558080 , 211201 },
|
|
{ 87350762 , 211647 },
|
|
{ 88148708 , 212093 },
|
|
{ 88951938 , 212539 },
|
|
{ 89760475 , 212985 },
|
|
{ 90574339 , 213432 },
|
|
{ 91393551 , 213878 },
|
|
{ 92218133 , 214325 },
|
|
{ 93048107 , 214772 },
|
|
{ 93883493 , 215219 },
|
|
{ 94724314 , 215666 },
|
|
{ 95570590 , 216114 },
|
|
{ 96422343 , 216561 },
|
|
{ 97279594 , 217009 },
|
|
{ 98142366 , 217457 },
|
|
{ 99010679 , 217905 },
|
|
{ 99884556 , 218353 },
|
|
{ 100764018 , 218801 },
|
|
{ 101649086 , 219250 },
|
|
{ 102539782 , 219698 },
|
|
{ 103436128 , 220147 },
|
|
{ 104338146 , 220596 },
|
|
{ 105245857 , 221046 },
|
|
{ 106159284 , 221495 },
|
|
{ 107078448 , 221945 },
|
|
{ 108003370 , 222394 },
|
|
{ 108934074 , 222844 },
|
|
{ 109870580 , 223294 },
|
|
{ 110812910 , 223745 },
|
|
{ 111761087 , 224195 },
|
|
{ 112715133 , 224646 },
|
|
{ 113675069 , 225097 },
|
|
{ 114640918 , 225548 },
|
|
{ 115612702 , 225999 },
|
|
{ 116590442 , 226450 },
|
|
{ 117574162 , 226902 },
|
|
{ 118563882 , 227353 },
|
|
{ 119559626 , 227805 },
|
|
{ 120561415 , 228258 },
|
|
{ 121569272 , 228710 },
|
|
{ 122583219 , 229162 },
|
|
{ 123603278 , 229615 },
|
|
{ 124629471 , 230068 },
|
|
{ 125661822 , 230521 },
|
|
{ 126700352 , 230974 },
|
|
{ 127745083 , 231428 },
|
|
{ 128796039 , 231882 },
|
|
{ 129853241 , 232336 },
|
|
{ 130916713 , 232790 },
|
|
{ 131986475 , 233244 },
|
|
{ 133062553 , 233699 },
|
|
{ 134144966 , 234153 },
|
|
{ 135233739 , 234608 },
|
|
{ 136328894 , 235064 },
|
|
{ 137430453 , 235519 },
|
|
{ 138538440 , 235975 },
|
|
{ 139652876 , 236430 },
|
|
{ 140773786 , 236886 },
|
|
{ 141901190 , 237343 },
|
|
{ 143035113 , 237799 },
|
|
{ 144175576 , 238256 },
|
|
{ 145322604 , 238713 },
|
|
{ 146476218 , 239170 },
|
|
{ 147636442 , 239627 },
|
|
{ 148803298 , 240085 },
|
|
{ 149976809 , 240542 },
|
|
{ 151156999 , 241000 },
|
|
{ 152343890 , 241459 },
|
|
{ 153537506 , 241917 },
|
|
{ 154737869 , 242376 },
|
|
{ 155945002 , 242835 },
|
|
{ 157158929 , 243294 },
|
|
{ 158379673 , 243753 },
|
|
{ 159607257 , 244213 },
|
|
{ 160841704 , 244673 },
|
|
{ 162083037 , 245133 },
|
|
{ 163331279 , 245593 },
|
|
{ 164586455 , 246054 },
|
|
{ 165848586 , 246514 },
|
|
{ 167117696 , 246975 },
|
|
{ 168393810 , 247437 },
|
|
{ 169676949 , 247898 },
|
|
{ 170967138 , 248360 },
|
|
{ 172264399 , 248822 },
|
|
{ 173568757 , 249284 },
|
|
{ 174880235 , 249747 },
|
|
{ 176198856 , 250209 },
|
|
{ 177524643 , 250672 },
|
|
{ 178857621 , 251136 },
|
|
{ 180197813 , 251599 },
|
|
{ 181545242 , 252063 },
|
|
{ 182899933 , 252527 },
|
|
{ 184261908 , 252991 },
|
|
{ 185631191 , 253456 },
|
|
{ 187007807 , 253920 },
|
|
{ 188391778 , 254385 },
|
|
{ 189783129 , 254851 },
|
|
{ 191181884 , 255316 },
|
|
{ 192588065 , 255782 },
|
|
{ 194001698 , 256248 },
|
|
{ 195422805 , 256714 },
|
|
{ 196851411 , 257181 },
|
|
{ 198287540 , 257648 },
|
|
{ 199731215 , 258115 },
|
|
{ 201182461 , 258582 },
|
|
{ 202641302 , 259050 },
|
|
{ 204107760 , 259518 },
|
|
{ 205581862 , 259986 },
|
|
{ 207063630 , 260454 },
|
|
{ 208553088 , 260923 },
|
|
{ 210050262 , 261392 },
|
|
{ 211555174 , 261861 },
|
|
{ 213067849 , 262331 },
|
|
{ 214588312 , 262800 },
|
|
{ 216116586 , 263270 },
|
|
{ 217652696 , 263741 },
|
|
{ 219196666 , 264211 },
|
|
{ 220748520 , 264682 },
|
|
{ 222308282 , 265153 },
|
|
{ 223875978 , 265625 },
|
|
{ 225451630 , 266097 },
|
|
{ 227035265 , 266569 },
|
|
{ 228626905 , 267041 },
|
|
{ 230226576 , 267514 },
|
|
{ 231834302 , 267986 },
|
|
{ 233450107 , 268460 },
|
|
{ 235074016 , 268933 },
|
|
{ 236706054 , 269407 },
|
|
{ 238346244 , 269881 },
|
|
{ 239994613 , 270355 },
|
|
{ 241651183 , 270830 },
|
|
{ 243315981 , 271305 }
|
|
};
|
|
|
|
/* Calculate the send rate as per section 3.1 of RFC3448
|
|
|
|
Returns send rate in bytes per second
|
|
|
|
Integer maths and lookups are used as not allowed floating point in kernel
|
|
|
|
The function for Xcalc as per section 3.1 of RFC3448 is:
|
|
|
|
X = s
|
|
-------------------------------------------------------------
|
|
R*sqrt(2*b*p/3) + (t_RTO * (3*sqrt(3*b*p/8) * p * (1+32*p^2)))
|
|
|
|
where
|
|
X is the trasmit rate in bytes/second
|
|
s is the packet size in bytes
|
|
R is the round trip time in seconds
|
|
p is the loss event rate, between 0 and 1.0, of the number of loss events
|
|
as a fraction of the number of packets transmitted
|
|
t_RTO is the TCP retransmission timeout value in seconds
|
|
b is the number of packets acknowledged by a single TCP acknowledgement
|
|
|
|
we can assume that b = 1 and t_RTO is 4 * R. With this the equation becomes:
|
|
|
|
X = s
|
|
-----------------------------------------------------------------------
|
|
R * sqrt(2 * p / 3) + (12 * R * (sqrt(3 * p / 8) * p * (1 + 32 * p^2)))
|
|
|
|
|
|
which we can break down into:
|
|
|
|
X = s
|
|
--------
|
|
R * f(p)
|
|
|
|
where f(p) = sqrt(2 * p / 3) + (12 * sqrt(3 * p / 8) * p * (1 + 32 * p * p))
|
|
|
|
Function parameters:
|
|
s - bytes
|
|
R - RTT in usecs
|
|
p - loss rate (decimal fraction multiplied by 1,000,000)
|
|
|
|
Returns Xcalc in bytes per second
|
|
|
|
DON'T alter this code unless you run test cases against it as the code
|
|
has been manipulated to stop underflow/overlow.
|
|
|
|
*/
|
|
static u32 ccid3_calc_x(u16 s, u32 R, u32 p)
|
|
{
|
|
int index;
|
|
u32 f;
|
|
u64 tmp1, tmp2;
|
|
|
|
if (p < CALCX_SPLIT)
|
|
index = (p / (CALCX_SPLIT / CALCX_ARRSIZE)) - 1;
|
|
else
|
|
index = (p / (1000000 / CALCX_ARRSIZE)) - 1;
|
|
|
|
if (index < 0)
|
|
/* p should be 0 unless there is a bug in my code */
|
|
index = 0;
|
|
|
|
if (R == 0)
|
|
R = 1; /* RTT can't be zero or else divide by zero */
|
|
|
|
BUG_ON(index >= CALCX_ARRSIZE);
|
|
|
|
if (p >= CALCX_SPLIT)
|
|
f = calcx_lookup[index][0];
|
|
else
|
|
f = calcx_lookup[index][1];
|
|
|
|
tmp1 = ((u64)s * 100000000);
|
|
tmp2 = ((u64)R * (u64)f);
|
|
do_div(tmp2,10000);
|
|
do_div(tmp1,tmp2);
|
|
/* don't alter above math unless you test due to overflow on 32 bit */
|
|
|
|
return (u32)tmp1;
|
|
}
|
|
|
|
/* Calculate new t_ipi (inter packet interval) by t_ipi = s / X_inst */
|
|
static inline void ccid3_calc_new_t_ipi(struct ccid3_hc_tx_sock *hctx)
|
|
{
|
|
if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK)
|
|
return;
|
|
/* if no feedback spec says t_ipi is 1 second (set elsewhere and then
|
|
* doubles after every no feedback timer (separate function) */
|
|
|
|
if (hctx->ccid3hctx_x < 10) {
|
|
ccid3_pr_debug("ccid3_calc_new_t_ipi - ccid3hctx_x < 10\n");
|
|
hctx->ccid3hctx_x = 10;
|
|
}
|
|
hctx->ccid3hctx_t_ipi = (hctx->ccid3hctx_s * 100000)
|
|
/ (hctx->ccid3hctx_x / 10);
|
|
/* reason for above maths with 10 in there is to avoid 32 bit
|
|
* overflow for jumbo packets */
|
|
|
|
}
|
|
|
|
/* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */
|
|
static inline void ccid3_calc_new_delta(struct ccid3_hc_tx_sock *hctx)
|
|
{
|
|
hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, TFRC_OPSYS_HALF_TIME_GRAN);
|
|
|
|
}
|
|
|
|
/*
|
|
* Update X by
|
|
* If (p > 0)
|
|
* x_calc = calcX(s, R, p);
|
|
* X = max(min(X_calc, 2 * X_recv), s / t_mbi);
|
|
* Else
|
|
* If (now - tld >= R)
|
|
* X = max(min(2 * X, 2 * X_recv), s / R);
|
|
* tld = now;
|
|
*/
|
|
static void ccid3_hc_tx_update_x(struct sock *sk)
|
|
{
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
|
|
|
|
if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) { /* to avoid large error in calcX */
|
|
hctx->ccid3hctx_x_calc = ccid3_calc_x(hctx->ccid3hctx_s,
|
|
hctx->ccid3hctx_rtt,
|
|
hctx->ccid3hctx_p);
|
|
hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_calc, 2 * hctx->ccid3hctx_x_recv),
|
|
hctx->ccid3hctx_s / TFRC_MAX_BACK_OFF_TIME);
|
|
} else if (now_delta(hctx->ccid3hctx_t_ld) >= hctx->ccid3hctx_rtt) {
|
|
u32 rtt = hctx->ccid3hctx_rtt;
|
|
if (rtt < 10) {
|
|
rtt = 10;
|
|
} /* avoid divide by zero below */
|
|
|
|
hctx->ccid3hctx_x = max_t(u32, min_t(u32, 2 * hctx->ccid3hctx_x_recv, 2 * hctx->ccid3hctx_x),
|
|
(hctx->ccid3hctx_s * 100000) / (rtt / 10));
|
|
/* Using 100000 and 10 to avoid 32 bit overflow for jumbo frames */
|
|
do_gettimeofday(&hctx->ccid3hctx_t_ld);
|
|
}
|
|
|
|
if (hctx->ccid3hctx_x == 0) {
|
|
ccid3_pr_debug("ccid3hctx_x = 0!\n");
|
|
hctx->ccid3hctx_x = 1;
|
|
}
|
|
}
|
|
|
|
static void ccid3_hc_tx_no_feedback_timer(unsigned long data)
|
|
{
|
|
struct sock *sk = (struct sock *)data;
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
unsigned long next_tmout = 0;
|
|
struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
|
|
u32 rtt;
|
|
|
|
bh_lock_sock(sk);
|
|
if (sock_owned_by_user(sk)) {
|
|
/* Try again later. */
|
|
/* XXX: set some sensible MIB */
|
|
sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, jiffies + HZ / 5);
|
|
goto out;
|
|
}
|
|
|
|
ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk,
|
|
ccid3_tx_state_name(hctx->ccid3hctx_state));
|
|
|
|
if (hctx->ccid3hctx_x < 10) {
|
|
ccid3_pr_debug("TFRC_SSTATE_NO_FBACK ccid3hctx_x < 10\n");
|
|
hctx->ccid3hctx_x = 10;
|
|
}
|
|
|
|
switch (hctx->ccid3hctx_state) {
|
|
case TFRC_SSTATE_TERM:
|
|
goto out;
|
|
case TFRC_SSTATE_NO_FBACK:
|
|
/* Halve send rate */
|
|
hctx->ccid3hctx_x /= 2;
|
|
if (hctx->ccid3hctx_x < (hctx->ccid3hctx_s / TFRC_MAX_BACK_OFF_TIME))
|
|
hctx->ccid3hctx_x = hctx->ccid3hctx_s / TFRC_MAX_BACK_OFF_TIME;
|
|
|
|
ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d bytes/s\n",
|
|
dccp_role(sk), sk, ccid3_tx_state_name(hctx->ccid3hctx_state),
|
|
hctx->ccid3hctx_x);
|
|
next_tmout = max_t(u32, 2 * (hctx->ccid3hctx_s * 100000)
|
|
/ (hctx->ccid3hctx_x / 10), TFRC_INITIAL_TIMEOUT);
|
|
/* do above maths with 100000 and 10 to prevent overflow on 32 bit */
|
|
/* FIXME - not sure above calculation is correct. See section 5 of CCID3 11
|
|
* should adjust tx_t_ipi and double that to achieve it really */
|
|
break;
|
|
case TFRC_SSTATE_FBACK:
|
|
/* Check if IDLE since last timeout and recv rate is less than 4 packets per RTT */
|
|
rtt = hctx->ccid3hctx_rtt;
|
|
if (rtt < 10)
|
|
rtt = 10;
|
|
/* stop divide by zero below */
|
|
if (!hctx->ccid3hctx_idle || (hctx->ccid3hctx_x_recv >=
|
|
4 * (hctx->ccid3hctx_s * 100000) / (rtt / 10))) {
|
|
ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", dccp_role(sk), sk,
|
|
ccid3_tx_state_name(hctx->ccid3hctx_state));
|
|
/* Halve sending rate */
|
|
|
|
/* If (X_calc > 2 * X_recv)
|
|
* X_recv = max(X_recv / 2, s / (2 * t_mbi));
|
|
* Else
|
|
* X_recv = X_calc / 4;
|
|
*/
|
|
BUG_ON(hctx->ccid3hctx_p >= TFRC_SMALLEST_P && hctx->ccid3hctx_x_calc == 0);
|
|
|
|
/* check also if p is zero -> x_calc is infinity? */
|
|
if (hctx->ccid3hctx_p < TFRC_SMALLEST_P ||
|
|
hctx->ccid3hctx_x_calc > 2 * hctx->ccid3hctx_x_recv)
|
|
hctx->ccid3hctx_x_recv = max_t(u32, hctx->ccid3hctx_x_recv / 2,
|
|
hctx->ccid3hctx_s / (2 * TFRC_MAX_BACK_OFF_TIME));
|
|
else
|
|
hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4;
|
|
|
|
/* Update sending rate */
|
|
ccid3_hc_tx_update_x(sk);
|
|
}
|
|
if (hctx->ccid3hctx_x == 0) {
|
|
ccid3_pr_debug("TFRC_SSTATE_FBACK ccid3hctx_x = 0!\n");
|
|
hctx->ccid3hctx_x = 10;
|
|
}
|
|
/* Schedule no feedback timer to expire in max(4 * R, 2 * s / X) */
|
|
next_tmout = max_t(u32, hctx->ccid3hctx_t_rto,
|
|
2 * (hctx->ccid3hctx_s * 100000) / (hctx->ccid3hctx_x / 10));
|
|
break;
|
|
default:
|
|
printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
|
|
__FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state);
|
|
dump_stack();
|
|
goto out;
|
|
}
|
|
|
|
sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
|
|
jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout)));
|
|
hctx->ccid3hctx_idle = 1;
|
|
out:
|
|
bh_unlock_sock(sk);
|
|
sock_put(sk);
|
|
}
|
|
|
|
static int ccid3_hc_tx_send_packet(struct sock *sk,
|
|
struct sk_buff *skb, int len)
|
|
{
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
|
|
struct dccp_tx_hist_entry *new_packet;
|
|
struct timeval now;
|
|
long delay;
|
|
int rc = -ENOTCONN;
|
|
|
|
// ccid3_pr_debug("%s, sk=%p, skb=%p, len=%d\n", dccp_role(sk), sk, skb, len);
|
|
/*
|
|
* check if pure ACK or Terminating */
|
|
/* XXX: We only call this function for DATA and DATAACK, on, these packets can have
|
|
* zero length, but why the comment about "pure ACK"?
|
|
*/
|
|
if (hctx == NULL || len == 0 || hctx->ccid3hctx_state == TFRC_SSTATE_TERM)
|
|
goto out;
|
|
|
|
/* See if last packet allocated was not sent */
|
|
new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist);
|
|
if (new_packet == NULL || new_packet->dccphtx_sent) {
|
|
new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, SLAB_ATOMIC);
|
|
|
|
rc = -ENOBUFS;
|
|
if (new_packet == NULL) {
|
|
ccid3_pr_debug("%s, sk=%p, not enough mem to add "
|
|
"to history, send refused\n", dccp_role(sk), sk);
|
|
goto out;
|
|
}
|
|
|
|
dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet);
|
|
}
|
|
|
|
do_gettimeofday(&now);
|
|
|
|
switch (hctx->ccid3hctx_state) {
|
|
case TFRC_SSTATE_NO_SENT:
|
|
ccid3_pr_debug("%s, sk=%p, first packet(%llu)\n", dccp_role(sk), sk,
|
|
dp->dccps_gss);
|
|
|
|
hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer;
|
|
hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk;
|
|
sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT));
|
|
hctx->ccid3hctx_last_win_count = 0;
|
|
hctx->ccid3hctx_t_last_win_count = now;
|
|
ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK);
|
|
hctx->ccid3hctx_t_ipi = TFRC_INITIAL_TIMEOUT;
|
|
|
|
/* Set nominal send time for initial packet */
|
|
hctx->ccid3hctx_t_nom = now;
|
|
(hctx->ccid3hctx_t_nom).tv_usec += hctx->ccid3hctx_t_ipi;
|
|
timeval_fix(&(hctx->ccid3hctx_t_nom));
|
|
ccid3_calc_new_delta(hctx);
|
|
rc = 0;
|
|
break;
|
|
case TFRC_SSTATE_NO_FBACK:
|
|
case TFRC_SSTATE_FBACK:
|
|
delay = (now_delta(hctx->ccid3hctx_t_nom) - hctx->ccid3hctx_delta);
|
|
ccid3_pr_debug("send_packet delay=%ld\n", delay);
|
|
delay /= -1000;
|
|
/* divide by -1000 is to convert to ms and get sign right */
|
|
rc = delay > 0 ? -EAGAIN : 0;
|
|
break;
|
|
default:
|
|
printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
|
|
__FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state);
|
|
dump_stack();
|
|
rc = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
/* Can we send? if so add options and add to packet history */
|
|
if (rc == 0)
|
|
new_packet->dccphtx_ccval =
|
|
DCCP_SKB_CB(skb)->dccpd_ccval =
|
|
hctx->ccid3hctx_last_win_count;
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len)
|
|
{
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
|
|
struct timeval now;
|
|
|
|
// ccid3_pr_debug("%s, sk=%p, more=%d, len=%d\n", dccp_role(sk), sk, more, len);
|
|
BUG_ON(hctx == NULL);
|
|
|
|
if (hctx->ccid3hctx_state == TFRC_SSTATE_TERM) {
|
|
ccid3_pr_debug("%s, sk=%p, while state is TFRC_SSTATE_TERM!\n",
|
|
dccp_role(sk), sk);
|
|
return;
|
|
}
|
|
|
|
do_gettimeofday(&now);
|
|
|
|
/* check if we have sent a data packet */
|
|
if (len > 0) {
|
|
unsigned long quarter_rtt;
|
|
struct dccp_tx_hist_entry *packet;
|
|
|
|
packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist);
|
|
if (packet == NULL) {
|
|
printk(KERN_CRIT "%s: packet doesn't exists in history!\n", __FUNCTION__);
|
|
return;
|
|
}
|
|
if (packet->dccphtx_sent) {
|
|
printk(KERN_CRIT "%s: no unsent packet in history!\n", __FUNCTION__);
|
|
return;
|
|
}
|
|
packet->dccphtx_tstamp = now;
|
|
packet->dccphtx_seqno = dp->dccps_gss;
|
|
#if 0
|
|
ccid3_pr_debug("%s, sk=%p, seqno=%llu inserted!\n",
|
|
dccp_role(sk), sk, packet->dccphtx_seqno);
|
|
#endif
|
|
/*
|
|
* Check if win_count have changed */
|
|
/* COMPLIANCE_BEGIN
|
|
* Algorithm in "8.1. Window Counter Valuer" in draft-ietf-dccp-ccid3-11.txt
|
|
*/
|
|
quarter_rtt = now_delta(hctx->ccid3hctx_t_last_win_count) / (hctx->ccid3hctx_rtt / 4);
|
|
if (quarter_rtt > 0) {
|
|
hctx->ccid3hctx_t_last_win_count = now;
|
|
hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count +
|
|
min_t(unsigned long, quarter_rtt, 5)) % 16;
|
|
ccid3_pr_debug("%s, sk=%p, window changed from %u to %u!\n",
|
|
dccp_role(sk), sk,
|
|
packet->dccphtx_ccval,
|
|
hctx->ccid3hctx_last_win_count);
|
|
}
|
|
/* COMPLIANCE_END */
|
|
#if 0
|
|
ccid3_pr_debug("%s, sk=%p, packet sent (%llu,%u)\n",
|
|
dccp_role(sk), sk,
|
|
packet->dccphtx_seqno,
|
|
packet->dccphtx_ccval);
|
|
#endif
|
|
hctx->ccid3hctx_idle = 0;
|
|
packet->dccphtx_rtt = hctx->ccid3hctx_rtt;
|
|
packet->dccphtx_sent = 1;
|
|
} else
|
|
ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n",
|
|
dccp_role(sk), sk, dp->dccps_gss);
|
|
|
|
switch (hctx->ccid3hctx_state) {
|
|
case TFRC_SSTATE_NO_SENT:
|
|
/* if first wasn't pure ack */
|
|
if (len != 0)
|
|
printk(KERN_CRIT "%s: %s, First packet sent is noted as a data packet\n",
|
|
__FUNCTION__, dccp_role(sk));
|
|
return;
|
|
case TFRC_SSTATE_NO_FBACK:
|
|
case TFRC_SSTATE_FBACK:
|
|
if (len > 0) {
|
|
hctx->ccid3hctx_t_nom = now;
|
|
ccid3_calc_new_t_ipi(hctx);
|
|
ccid3_calc_new_delta(hctx);
|
|
(hctx->ccid3hctx_t_nom).tv_usec += hctx->ccid3hctx_t_ipi;
|
|
timeval_fix(&(hctx->ccid3hctx_t_nom));
|
|
}
|
|
break;
|
|
default:
|
|
printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
|
|
__FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state);
|
|
dump_stack();
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
|
|
struct ccid3_options_received *opt_recv;
|
|
struct dccp_tx_hist_entry *packet;
|
|
unsigned long next_tmout;
|
|
u32 t_elapsed;
|
|
u32 pinv;
|
|
u32 x_recv;
|
|
u32 r_sample;
|
|
#if 0
|
|
ccid3_pr_debug("%s, sk=%p(%s), skb=%p(%s)\n",
|
|
dccp_role(sk), sk, dccp_state_name(sk->sk_state),
|
|
skb, dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type));
|
|
#endif
|
|
if (hctx == NULL)
|
|
return;
|
|
|
|
if (hctx->ccid3hctx_state == TFRC_SSTATE_TERM) {
|
|
ccid3_pr_debug("%s, sk=%p, received a packet when terminating!\n", dccp_role(sk), sk);
|
|
return;
|
|
}
|
|
|
|
/* 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;
|
|
|
|
t_elapsed = dp->dccps_options_received.dccpor_elapsed_time;
|
|
x_recv = opt_recv->ccid3or_receive_rate;
|
|
pinv = opt_recv->ccid3or_loss_event_rate;
|
|
|
|
switch (hctx->ccid3hctx_state) {
|
|
case TFRC_SSTATE_NO_SENT:
|
|
/* FIXME: what to do here? */
|
|
return;
|
|
case TFRC_SSTATE_NO_FBACK:
|
|
case TFRC_SSTATE_FBACK:
|
|
/* Calculate new round trip sample by
|
|
* R_sample = (now - t_recvdata) - t_delay */
|
|
/* get t_recvdata from history */
|
|
packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist,
|
|
DCCP_SKB_CB(skb)->dccpd_ack_seq);
|
|
if (packet == NULL) {
|
|
ccid3_pr_debug("%s, sk=%p, seqno %llu(%s) does't exist in history!\n",
|
|
dccp_role(sk), sk, DCCP_SKB_CB(skb)->dccpd_ack_seq,
|
|
dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type));
|
|
return;
|
|
}
|
|
|
|
/* Update RTT */
|
|
r_sample = now_delta(packet->dccphtx_tstamp);
|
|
/* FIXME: */
|
|
// r_sample -= usecs_to_jiffies(t_elapsed * 10);
|
|
|
|
/* Update RTT estimate by
|
|
* 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) {
|
|
ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK);
|
|
hctx->ccid3hctx_rtt = r_sample;
|
|
} else
|
|
hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 + r_sample / 10;
|
|
|
|
/*
|
|
* XXX: this is to avoid a division by zero in ccid3_hc_tx_packet_sent
|
|
* implemention of the new window count.
|
|
*/
|
|
if (hctx->ccid3hctx_rtt < 4)
|
|
hctx->ccid3hctx_rtt = 4;
|
|
|
|
ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, r_sample=%us\n",
|
|
dccp_role(sk), sk,
|
|
hctx->ccid3hctx_rtt,
|
|
r_sample);
|
|
|
|
/* Update timeout interval */
|
|
hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt,
|
|
USEC_PER_SEC);
|
|
|
|
/* Update receive rate */
|
|
hctx->ccid3hctx_x_recv = x_recv; /* x_recv in bytes per second */
|
|
|
|
/* Update loss event rate */
|
|
if (pinv == ~0 || pinv == 0)
|
|
hctx->ccid3hctx_p = 0;
|
|
else {
|
|
hctx->ccid3hctx_p = 1000000 / pinv;
|
|
|
|
if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) {
|
|
hctx->ccid3hctx_p = TFRC_SMALLEST_P;
|
|
ccid3_pr_debug("%s, sk=%p, Smallest p used!\n", dccp_role(sk), sk);
|
|
}
|
|
}
|
|
|
|
/* unschedule no feedback timer */
|
|
sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer);
|
|
|
|
/* Update sending rate */
|
|
ccid3_hc_tx_update_x(sk);
|
|
|
|
/* Update next send time */
|
|
if (hctx->ccid3hctx_t_ipi > (hctx->ccid3hctx_t_nom).tv_usec) {
|
|
hctx->ccid3hctx_t_nom.tv_usec += USEC_PER_SEC;
|
|
(hctx->ccid3hctx_t_nom).tv_sec--;
|
|
}
|
|
/* FIXME - if no feedback then t_ipi can go > 1 second */
|
|
(hctx->ccid3hctx_t_nom).tv_usec -= hctx->ccid3hctx_t_ipi;
|
|
ccid3_calc_new_t_ipi(hctx);
|
|
(hctx->ccid3hctx_t_nom).tv_usec += hctx->ccid3hctx_t_ipi;
|
|
timeval_fix(&(hctx->ccid3hctx_t_nom));
|
|
ccid3_calc_new_delta(hctx);
|
|
|
|
/* remove all packets older than the one acked from history */
|
|
dccp_tx_hist_purge_older(ccid3_tx_hist,
|
|
&hctx->ccid3hctx_hist, packet);
|
|
|
|
if (hctx->ccid3hctx_x < 10) {
|
|
ccid3_pr_debug("ccid3_hc_tx_packet_recv hctx->ccid3hctx_x < 10\n");
|
|
hctx->ccid3hctx_x = 10;
|
|
}
|
|
/* to prevent divide by zero below */
|
|
|
|
/* Schedule no feedback timer to expire in max(4 * R, 2 * s / X) */
|
|
next_tmout = max(hctx->ccid3hctx_t_rto,
|
|
(2 * (hctx->ccid3hctx_s * 100000) /
|
|
(hctx->ccid3hctx_x / 10)));
|
|
/* maths with 100000 and 10 is to prevent overflow with 32 bit */
|
|
|
|
ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to expire in %lu jiffies (%luus)\n",
|
|
dccp_role(sk), sk, usecs_to_jiffies(next_tmout), next_tmout);
|
|
|
|
sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
|
|
jiffies + max_t(u32,1,usecs_to_jiffies(next_tmout)));
|
|
|
|
/* set idle flag */
|
|
hctx->ccid3hctx_idle = 1;
|
|
break;
|
|
default:
|
|
printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
|
|
__FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state);
|
|
dump_stack();
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
const struct dccp_sock *dp = dccp_sk(sk);
|
|
struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
|
|
|
|
if (hctx == NULL || !(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN))
|
|
return;
|
|
|
|
DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count;
|
|
}
|
|
|
|
static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option,
|
|
unsigned char len, u16 idx, unsigned char *value)
|
|
{
|
|
int rc = 0;
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
|
|
struct ccid3_options_received *opt_recv;
|
|
|
|
if (hctx == NULL)
|
|
return 0;
|
|
|
|
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:
|
|
if (len != 4) {
|
|
ccid3_pr_debug("%s, sk=%p, invalid len for TFRC_OPT_LOSS_EVENT_RATE\n",
|
|
dccp_role(sk), sk);
|
|
rc = -EINVAL;
|
|
} else {
|
|
opt_recv->ccid3or_loss_event_rate = ntohl(*(u32 *)value);
|
|
ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n",
|
|
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;
|
|
ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n",
|
|
dccp_role(sk), sk,
|
|
opt_recv->ccid3or_loss_intervals_idx,
|
|
opt_recv->ccid3or_loss_intervals_len);
|
|
break;
|
|
case TFRC_OPT_RECEIVE_RATE:
|
|
if (len != 4) {
|
|
ccid3_pr_debug("%s, sk=%p, invalid len for TFRC_OPT_RECEIVE_RATE\n",
|
|
dccp_role(sk), sk);
|
|
rc = -EINVAL;
|
|
} else {
|
|
opt_recv->ccid3or_receive_rate = ntohl(*(u32 *)value);
|
|
ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n",
|
|
dccp_role(sk), sk,
|
|
opt_recv->ccid3or_receive_rate);
|
|
}
|
|
break;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int ccid3_hc_tx_init(struct sock *sk)
|
|
{
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
struct ccid3_hc_tx_sock *hctx;
|
|
|
|
ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
|
|
|
|
hctx = dp->dccps_hc_tx_ccid_private = kmalloc(sizeof(*hctx), gfp_any());
|
|
if (hctx == NULL)
|
|
return -ENOMEM;
|
|
|
|
memset(hctx, 0, sizeof(*hctx));
|
|
|
|
if (dp->dccps_avg_packet_size >= TFRC_MIN_PACKET_SIZE &&
|
|
dp->dccps_avg_packet_size <= TFRC_MAX_PACKET_SIZE)
|
|
hctx->ccid3hctx_s = (u16)dp->dccps_avg_packet_size;
|
|
else
|
|
hctx->ccid3hctx_s = TFRC_STD_PACKET_SIZE;
|
|
|
|
hctx->ccid3hctx_x = hctx->ccid3hctx_s; /* set transmission rate to 1 packet per second */
|
|
hctx->ccid3hctx_rtt = 4; /* See ccid3_hc_tx_packet_sent win_count calculatation */
|
|
hctx->ccid3hctx_t_rto = USEC_PER_SEC;
|
|
hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT;
|
|
INIT_LIST_HEAD(&hctx->ccid3hctx_hist);
|
|
init_timer(&hctx->ccid3hctx_no_feedback_timer);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ccid3_hc_tx_exit(struct sock *sk)
|
|
{
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
|
|
|
|
ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
|
|
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 */
|
|
dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist);
|
|
|
|
kfree(dp->dccps_hc_tx_ccid_private);
|
|
dp->dccps_hc_tx_ccid_private = NULL;
|
|
}
|
|
|
|
/*
|
|
* RX Half Connection methods
|
|
*/
|
|
|
|
/* TFRC receiver states */
|
|
enum ccid3_hc_rx_states {
|
|
TFRC_RSTATE_NO_DATA = 1,
|
|
TFRC_RSTATE_DATA,
|
|
TFRC_RSTATE_TERM = 127,
|
|
};
|
|
|
|
#ifdef CCID3_DEBUG
|
|
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
|
|
|
|
static inline void ccid3_hc_rx_set_state(struct sock *sk, enum ccid3_hc_rx_states state)
|
|
{
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
|
|
enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state;
|
|
|
|
ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
|
|
dccp_role(sk), sk, ccid3_rx_state_name(oldstate), ccid3_rx_state_name(state));
|
|
WARN_ON(state == oldstate);
|
|
hcrx->ccid3hcrx_state = state;
|
|
}
|
|
|
|
static int ccid3_hc_rx_add_hist(struct sock *sk,
|
|
struct dccp_rx_hist_entry *packet)
|
|
{
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
|
|
struct dccp_rx_hist_entry *entry, *next, *iter;
|
|
u8 num_later = 0;
|
|
|
|
iter = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist);
|
|
if (iter == NULL)
|
|
dccp_rx_hist_add_entry(&hcrx->ccid3hcrx_hist, packet);
|
|
else {
|
|
const u64 seqno = packet->dccphrx_seqno;
|
|
|
|
if (after48(seqno, iter->dccphrx_seqno))
|
|
dccp_rx_hist_add_entry(&hcrx->ccid3hcrx_hist, packet);
|
|
else {
|
|
if (dccp_rx_hist_entry_data_packet(iter))
|
|
num_later = 1;
|
|
|
|
list_for_each_entry_continue(iter,
|
|
&hcrx->ccid3hcrx_hist,
|
|
dccphrx_node) {
|
|
if (after48(seqno, iter->dccphrx_seqno)) {
|
|
dccp_rx_hist_add_entry(&iter->dccphrx_node,
|
|
packet);
|
|
goto trim_history;
|
|
}
|
|
|
|
if (dccp_rx_hist_entry_data_packet(iter))
|
|
num_later++;
|
|
|
|
if (num_later == TFRC_RECV_NUM_LATE_LOSS) {
|
|
dccp_rx_hist_entry_delete(ccid3_rx_hist, packet);
|
|
ccid3_pr_debug("%s, sk=%p, packet(%llu) already lost!\n",
|
|
dccp_role(sk), sk, seqno);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
if (num_later < TFRC_RECV_NUM_LATE_LOSS)
|
|
dccp_rx_hist_add_entry(&hcrx->ccid3hcrx_hist,
|
|
packet);
|
|
/* FIXME: else what? should we destroy the packet like above? */
|
|
}
|
|
}
|
|
|
|
trim_history:
|
|
/* Trim history (remove all packets after the NUM_LATE_LOSS + 1 data packets) */
|
|
num_later = TFRC_RECV_NUM_LATE_LOSS + 1;
|
|
|
|
if (!list_empty(&hcrx->ccid3hcrx_loss_interval_hist)) {
|
|
list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist,
|
|
dccphrx_node) {
|
|
if (num_later == 0) {
|
|
list_del_init(&entry->dccphrx_node);
|
|
dccp_rx_hist_entry_delete(ccid3_rx_hist, entry);
|
|
} else if (dccp_rx_hist_entry_data_packet(entry))
|
|
--num_later;
|
|
}
|
|
} else {
|
|
int step = 0;
|
|
u8 win_count = 0; /* Not needed, but lets shut up gcc */
|
|
int tmp;
|
|
/*
|
|
* We have no loss interval history so we need at least one
|
|
* rtt:s of data packets to approximate rtt.
|
|
*/
|
|
list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist,
|
|
dccphrx_node) {
|
|
if (num_later == 0) {
|
|
switch (step) {
|
|
case 0:
|
|
step = 1;
|
|
/* OK, find next data packet */
|
|
num_later = 1;
|
|
break;
|
|
case 1:
|
|
step = 2;
|
|
/* OK, find next data packet */
|
|
num_later = 1;
|
|
win_count = entry->dccphrx_ccval;
|
|
break;
|
|
case 2:
|
|
tmp = win_count - entry->dccphrx_ccval;
|
|
if (tmp < 0)
|
|
tmp += TFRC_WIN_COUNT_LIMIT;
|
|
if (tmp > TFRC_WIN_COUNT_PER_RTT + 1) {
|
|
/* we have found a packet older than one rtt
|
|
* remove the rest */
|
|
step = 3;
|
|
} else /* OK, find next data packet */
|
|
num_later = 1;
|
|
break;
|
|
case 3:
|
|
list_del_init(&entry->dccphrx_node);
|
|
dccp_rx_hist_entry_delete(ccid3_rx_hist, entry);
|
|
break;
|
|
}
|
|
} else if (dccp_rx_hist_entry_data_packet(entry))
|
|
--num_later;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ccid3_hc_rx_send_feedback(struct sock *sk)
|
|
{
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
|
|
struct dccp_rx_hist_entry *packet;
|
|
|
|
ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
|
|
|
|
switch (hcrx->ccid3hcrx_state) {
|
|
case TFRC_RSTATE_NO_DATA:
|
|
hcrx->ccid3hcrx_x_recv = 0;
|
|
break;
|
|
case TFRC_RSTATE_DATA: {
|
|
u32 delta = now_delta(hcrx->ccid3hcrx_tstamp_last_feedback);
|
|
|
|
if (delta == 0)
|
|
delta = 1; /* to prevent divide by zero */
|
|
hcrx->ccid3hcrx_x_recv = (hcrx->ccid3hcrx_bytes_recv *
|
|
USEC_PER_SEC) / delta;
|
|
}
|
|
break;
|
|
default:
|
|
printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
|
|
__FUNCTION__, dccp_role(sk), sk, hcrx->ccid3hcrx_state);
|
|
dump_stack();
|
|
return;
|
|
}
|
|
|
|
packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist);
|
|
if (packet == NULL) {
|
|
printk(KERN_CRIT "%s: %s, sk=%p, no data packet in history!\n",
|
|
__FUNCTION__, dccp_role(sk), sk);
|
|
dump_stack();
|
|
return;
|
|
}
|
|
|
|
do_gettimeofday(&(hcrx->ccid3hcrx_tstamp_last_feedback));
|
|
hcrx->ccid3hcrx_last_counter = packet->dccphrx_ccval;
|
|
hcrx->ccid3hcrx_seqno_last_counter = packet->dccphrx_seqno;
|
|
hcrx->ccid3hcrx_bytes_recv = 0;
|
|
|
|
/* Convert to multiples of 10us */
|
|
hcrx->ccid3hcrx_elapsed_time = now_delta(packet->dccphrx_tstamp) / 10;
|
|
if (hcrx->ccid3hcrx_p == 0)
|
|
hcrx->ccid3hcrx_pinv = ~0;
|
|
else
|
|
hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p;
|
|
dccp_send_ack(sk);
|
|
}
|
|
|
|
static void ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
const struct dccp_sock *dp = dccp_sk(sk);
|
|
struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
|
|
|
|
if (hcrx == NULL || !(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN))
|
|
return;
|
|
|
|
if (hcrx->ccid3hcrx_elapsed_time != 0 && !dccp_packet_without_ack(skb))
|
|
dccp_insert_option_elapsed_time(sk, skb, hcrx->ccid3hcrx_elapsed_time);
|
|
|
|
if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA) {
|
|
const u32 x_recv = htonl(hcrx->ccid3hcrx_x_recv);
|
|
const u32 pinv = htonl(hcrx->ccid3hcrx_pinv);
|
|
|
|
dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, &pinv, sizeof(pinv));
|
|
dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, &x_recv, sizeof(x_recv));
|
|
}
|
|
|
|
DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_last_counter;
|
|
}
|
|
|
|
/* Weights used to calculate loss event rate */
|
|
/*
|
|
* These are integers as per section 8 of RFC3448. We can then divide by 4 *
|
|
* when we use it.
|
|
*/
|
|
static const int ccid3_hc_rx_w[TFRC_RECV_IVAL_F_LENGTH] = {
|
|
4, 4, 4, 4, 3, 2, 1, 1,
|
|
};
|
|
|
|
/*
|
|
* args: fvalue - function value to match
|
|
* returns: p closest to that value
|
|
*
|
|
* both fvalue and p are multiplied by 1,000,000 to use ints
|
|
*/
|
|
static u32 calcx_reverse_lookup(u32 fvalue) {
|
|
int ctr = 0;
|
|
int small;
|
|
|
|
if (fvalue < calcx_lookup[0][1])
|
|
return 0;
|
|
if (fvalue <= calcx_lookup[CALCX_ARRSIZE-1][1])
|
|
small = 1;
|
|
else if (fvalue > calcx_lookup[CALCX_ARRSIZE-1][0])
|
|
return 1000000;
|
|
else
|
|
small = 0;
|
|
while (fvalue > calcx_lookup[ctr][small])
|
|
ctr++;
|
|
if (small)
|
|
return (CALCX_SPLIT * ctr / CALCX_ARRSIZE);
|
|
else
|
|
return (1000000 * ctr / CALCX_ARRSIZE) ;
|
|
}
|
|
|
|
/* calculate first loss interval
|
|
*
|
|
* returns estimated loss interval in usecs */
|
|
|
|
static u32 ccid3_hc_rx_calc_first_li(struct sock *sk)
|
|
{
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
|
|
struct dccp_rx_hist_entry *entry, *next, *tail = NULL;
|
|
u32 rtt, delta, x_recv, fval, p, tmp2;
|
|
struct timeval tstamp = { 0 }, tmp_tv;
|
|
int interval = 0;
|
|
int win_count = 0;
|
|
int step = 0;
|
|
u64 tmp1;
|
|
|
|
list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist,
|
|
dccphrx_node) {
|
|
if (dccp_rx_hist_entry_data_packet(entry)) {
|
|
tail = entry;
|
|
|
|
switch (step) {
|
|
case 0:
|
|
tstamp = entry->dccphrx_tstamp;
|
|
win_count = entry->dccphrx_ccval;
|
|
step = 1;
|
|
break;
|
|
case 1:
|
|
interval = win_count - entry->dccphrx_ccval;
|
|
if (interval < 0)
|
|
interval += TFRC_WIN_COUNT_LIMIT;
|
|
if (interval > 4)
|
|
goto found;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (step == 0) {
|
|
printk(KERN_CRIT "%s: %s, sk=%p, packet history contains no data packets!\n",
|
|
__FUNCTION__, dccp_role(sk), sk);
|
|
return ~0;
|
|
}
|
|
|
|
if (interval == 0) {
|
|
ccid3_pr_debug("%s, sk=%p, Could not find a win_count interval > 0. Defaulting to 1\n",
|
|
dccp_role(sk), sk);
|
|
interval = 1;
|
|
}
|
|
found:
|
|
timeval_sub(tstamp,tail->dccphrx_tstamp,&tmp_tv);
|
|
rtt = (tmp_tv.tv_sec * USEC_PER_SEC + tmp_tv.tv_usec) * 4 / interval;
|
|
ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n",
|
|
dccp_role(sk), sk, rtt);
|
|
if (rtt == 0)
|
|
rtt = 1;
|
|
|
|
delta = now_delta(hcrx->ccid3hcrx_tstamp_last_feedback);
|
|
if (delta == 0)
|
|
delta = 1;
|
|
|
|
x_recv = (hcrx->ccid3hcrx_bytes_recv * USEC_PER_SEC) / delta;
|
|
|
|
tmp1 = (u64)x_recv * (u64)rtt;
|
|
do_div(tmp1,10000000);
|
|
tmp2 = (u32)tmp1;
|
|
fval = (hcrx->ccid3hcrx_s * 100000) / tmp2;
|
|
/* do not alter order above or you will get overflow on 32 bit */
|
|
p = calcx_reverse_lookup(fval);
|
|
ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied loss rate=%u\n",\
|
|
dccp_role(sk), sk, x_recv, p);
|
|
|
|
if (p == 0)
|
|
return ~0;
|
|
else
|
|
return 1000000 / p;
|
|
}
|
|
|
|
static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss)
|
|
{
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
|
|
struct ccid3_loss_interval_hist_entry *li_entry;
|
|
|
|
if (seq_loss != DCCP_MAX_SEQNO + 1) {
|
|
ccid3_pr_debug("%s, sk=%p, seq_loss=%llu, win_loss=%u, packet loss detected\n",
|
|
dccp_role(sk), sk, seq_loss, win_loss);
|
|
|
|
if (list_empty(&hcrx->ccid3hcrx_loss_interval_hist)) {
|
|
struct ccid3_loss_interval_hist_entry *li_tail = NULL;
|
|
int i;
|
|
|
|
ccid3_pr_debug("%s, sk=%p, first loss event detected, creating history\n", dccp_role(sk), sk);
|
|
for (i = 0; i <= TFRC_RECV_IVAL_F_LENGTH; ++i) {
|
|
li_entry = ccid3_loss_interval_hist_entry_new(SLAB_ATOMIC);
|
|
if (li_entry == NULL) {
|
|
ccid3_loss_interval_history_delete(&hcrx->ccid3hcrx_loss_interval_hist);
|
|
ccid3_pr_debug("%s, sk=%p, not enough mem for creating history\n",
|
|
dccp_role(sk), sk);
|
|
return;
|
|
}
|
|
if (li_tail == NULL)
|
|
li_tail = li_entry;
|
|
list_add(&li_entry->ccid3lih_node, &hcrx->ccid3hcrx_loss_interval_hist);
|
|
}
|
|
|
|
li_entry->ccid3lih_seqno = seq_loss;
|
|
li_entry->ccid3lih_win_count = win_loss;
|
|
|
|
li_tail->ccid3lih_interval = ccid3_hc_rx_calc_first_li(sk);
|
|
}
|
|
}
|
|
/* FIXME: find end of interval */
|
|
}
|
|
|
|
static void ccid3_hc_rx_detect_loss(struct sock *sk)
|
|
{
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
|
|
struct dccp_rx_hist_entry *entry, *next, *packet;
|
|
struct dccp_rx_hist_entry *a_loss = NULL;
|
|
struct dccp_rx_hist_entry *b_loss = NULL;
|
|
u64 seq_loss = DCCP_MAX_SEQNO + 1;
|
|
u8 win_loss = 0;
|
|
u8 num_later = TFRC_RECV_NUM_LATE_LOSS;
|
|
|
|
list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist,
|
|
dccphrx_node) {
|
|
if (num_later == 0) {
|
|
b_loss = entry;
|
|
break;
|
|
} else if (dccp_rx_hist_entry_data_packet(entry))
|
|
--num_later;
|
|
}
|
|
|
|
if (b_loss == NULL)
|
|
goto out_update_li;
|
|
|
|
num_later = 1;
|
|
|
|
list_for_each_entry_safe_continue(entry, next, &hcrx->ccid3hcrx_hist,
|
|
dccphrx_node) {
|
|
if (num_later == 0) {
|
|
a_loss = entry;
|
|
break;
|
|
} else if (dccp_rx_hist_entry_data_packet(entry))
|
|
--num_later;
|
|
}
|
|
|
|
if (a_loss == NULL) {
|
|
if (list_empty(&hcrx->ccid3hcrx_loss_interval_hist)) {
|
|
/* no loss event have occured yet */
|
|
ccid3_pr_debug("%s, sk=%p, TODO: find a lost data "
|
|
"packet by comparing to initial seqno\n",
|
|
dccp_role(sk), sk);
|
|
goto out_update_li;
|
|
} else {
|
|
pr_info("%s: %s, sk=%p, ERROR! Less than 4 data packets in history",
|
|
__FUNCTION__, dccp_role(sk), sk);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* Locate a lost data packet */
|
|
entry = packet = b_loss;
|
|
list_for_each_entry_safe_continue(entry, next, &hcrx->ccid3hcrx_hist,
|
|
dccphrx_node) {
|
|
u64 delta = dccp_delta_seqno(entry->dccphrx_seqno,
|
|
packet->dccphrx_seqno);
|
|
|
|
if (delta != 0) {
|
|
if (dccp_rx_hist_entry_data_packet(packet))
|
|
--delta;
|
|
/*
|
|
* FIXME: check this, probably this % usage is because
|
|
* in earlier drafts the ndp count was just 8 bits
|
|
* long, but now it cam be up to 24 bits long.
|
|
*/
|
|
#if 0
|
|
if (delta % DCCP_NDP_LIMIT !=
|
|
(packet->dccphrx_ndp -
|
|
entry->dccphrx_ndp) % DCCP_NDP_LIMIT)
|
|
#endif
|
|
if (delta !=
|
|
packet->dccphrx_ndp - entry->dccphrx_ndp) {
|
|
seq_loss = entry->dccphrx_seqno;
|
|
dccp_inc_seqno(&seq_loss);
|
|
}
|
|
}
|
|
packet = entry;
|
|
if (packet == a_loss)
|
|
break;
|
|
}
|
|
|
|
if (seq_loss != DCCP_MAX_SEQNO + 1)
|
|
win_loss = a_loss->dccphrx_ccval;
|
|
|
|
out_update_li:
|
|
ccid3_hc_rx_update_li(sk, seq_loss, win_loss);
|
|
}
|
|
|
|
static u32 ccid3_hc_rx_calc_i_mean(struct sock *sk)
|
|
{
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
|
|
struct ccid3_loss_interval_hist_entry *li_entry, *li_next;
|
|
int i = 0;
|
|
u32 i_tot;
|
|
u32 i_tot0 = 0;
|
|
u32 i_tot1 = 0;
|
|
u32 w_tot = 0;
|
|
|
|
list_for_each_entry_safe(li_entry, li_next, &hcrx->ccid3hcrx_loss_interval_hist, ccid3lih_node) {
|
|
if (i < TFRC_RECV_IVAL_F_LENGTH) {
|
|
i_tot0 += li_entry->ccid3lih_interval * ccid3_hc_rx_w[i];
|
|
w_tot += ccid3_hc_rx_w[i];
|
|
}
|
|
|
|
if (i != 0)
|
|
i_tot1 += li_entry->ccid3lih_interval * ccid3_hc_rx_w[i - 1];
|
|
|
|
if (++i > TFRC_RECV_IVAL_F_LENGTH)
|
|
break;
|
|
}
|
|
|
|
if (i != TFRC_RECV_IVAL_F_LENGTH) {
|
|
pr_info("%s: %s, sk=%p, ERROR! Missing entry in interval history!\n",
|
|
__FUNCTION__, dccp_role(sk), sk);
|
|
return 0;
|
|
}
|
|
|
|
i_tot = max(i_tot0, i_tot1);
|
|
|
|
/* FIXME: Why do we do this? -Ian McDonald */
|
|
if (i_tot * 4 < w_tot)
|
|
i_tot = w_tot * 4;
|
|
|
|
return i_tot * 4 / w_tot;
|
|
}
|
|
|
|
static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
|
|
struct dccp_rx_hist_entry *packet;
|
|
struct timeval now;
|
|
u8 win_count;
|
|
u32 p_prev;
|
|
int ins;
|
|
#if 0
|
|
ccid3_pr_debug("%s, sk=%p(%s), skb=%p(%s)\n",
|
|
dccp_role(sk), sk, dccp_state_name(sk->sk_state),
|
|
skb, dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type));
|
|
#endif
|
|
if (hcrx == NULL)
|
|
return;
|
|
|
|
BUG_ON(!(hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA ||
|
|
hcrx->ccid3hcrx_state == TFRC_RSTATE_DATA));
|
|
|
|
switch (DCCP_SKB_CB(skb)->dccpd_type) {
|
|
case DCCP_PKT_ACK:
|
|
if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA)
|
|
return;
|
|
case DCCP_PKT_DATAACK:
|
|
if (dp->dccps_options_received.dccpor_timestamp_echo == 0)
|
|
break;
|
|
p_prev = hcrx->ccid3hcrx_rtt;
|
|
do_gettimeofday(&now);
|
|
/* hcrx->ccid3hcrx_rtt = now - dp->dccps_options_received.dccpor_timestamp_echo -
|
|
usecs_to_jiffies(dp->dccps_options_received.dccpor_elapsed_time * 10);
|
|
FIXME - I think above code is broken - have to look at options more, will also need
|
|
to fix pr_debug below */
|
|
if (p_prev != hcrx->ccid3hcrx_rtt)
|
|
ccid3_pr_debug("%s, sk=%p, New RTT estimate=%lu jiffies, tstamp_echo=%u, elapsed time=%u\n",
|
|
dccp_role(sk), sk, hcrx->ccid3hcrx_rtt,
|
|
dp->dccps_options_received.dccpor_timestamp_echo,
|
|
dp->dccps_options_received.dccpor_elapsed_time);
|
|
break;
|
|
case DCCP_PKT_DATA:
|
|
break;
|
|
default:
|
|
ccid3_pr_debug("%s, sk=%p, not DATA/DATAACK/ACK packet(%s)\n",
|
|
dccp_role(sk), sk,
|
|
dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type));
|
|
return;
|
|
}
|
|
|
|
packet = dccp_rx_hist_entry_new(ccid3_rx_hist,
|
|
dp->dccps_options_received.dccpor_ndp,
|
|
skb, SLAB_ATOMIC);
|
|
if (packet == NULL) {
|
|
ccid3_pr_debug("%s, sk=%p, Not enough mem to add rx packet to history (consider it lost)!",
|
|
dccp_role(sk), sk);
|
|
return;
|
|
}
|
|
|
|
win_count = packet->dccphrx_ccval;
|
|
|
|
ins = ccid3_hc_rx_add_hist(sk, packet);
|
|
|
|
if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK)
|
|
return;
|
|
|
|
switch (hcrx->ccid3hcrx_state) {
|
|
case TFRC_RSTATE_NO_DATA:
|
|
ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial feedback\n",
|
|
dccp_role(sk), sk, dccp_state_name(sk->sk_state), skb);
|
|
ccid3_hc_rx_send_feedback(sk);
|
|
ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA);
|
|
return;
|
|
case TFRC_RSTATE_DATA:
|
|
hcrx->ccid3hcrx_bytes_recv += skb->len - dccp_hdr(skb)->dccph_doff * 4;
|
|
if (ins == 0) {
|
|
do_gettimeofday(&now);
|
|
if ((now_delta(hcrx->ccid3hcrx_tstamp_last_ack)) >= hcrx->ccid3hcrx_rtt) {
|
|
hcrx->ccid3hcrx_tstamp_last_ack = now;
|
|
ccid3_hc_rx_send_feedback(sk);
|
|
}
|
|
return;
|
|
}
|
|
break;
|
|
default:
|
|
printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
|
|
__FUNCTION__, dccp_role(sk), sk, hcrx->ccid3hcrx_state);
|
|
dump_stack();
|
|
return;
|
|
}
|
|
|
|
/* Dealing with packet loss */
|
|
ccid3_pr_debug("%s, sk=%p(%s), skb=%p, data loss! Reacting...\n",
|
|
dccp_role(sk), sk, dccp_state_name(sk->sk_state), skb);
|
|
|
|
ccid3_hc_rx_detect_loss(sk);
|
|
p_prev = hcrx->ccid3hcrx_p;
|
|
|
|
/* Calculate loss event rate */
|
|
if (!list_empty(&hcrx->ccid3hcrx_loss_interval_hist))
|
|
/* Scaling up by 1000000 as fixed decimal */
|
|
hcrx->ccid3hcrx_p = 1000000 / ccid3_hc_rx_calc_i_mean(sk);
|
|
|
|
if (hcrx->ccid3hcrx_p > p_prev) {
|
|
ccid3_hc_rx_send_feedback(sk);
|
|
return;
|
|
}
|
|
}
|
|
|
|
static int ccid3_hc_rx_init(struct sock *sk)
|
|
{
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
struct ccid3_hc_rx_sock *hcrx;
|
|
|
|
ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
|
|
|
|
hcrx = dp->dccps_hc_rx_ccid_private = kmalloc(sizeof(*hcrx), gfp_any());
|
|
if (hcrx == NULL)
|
|
return -ENOMEM;
|
|
|
|
memset(hcrx, 0, sizeof(*hcrx));
|
|
|
|
if (dp->dccps_avg_packet_size >= TFRC_MIN_PACKET_SIZE &&
|
|
dp->dccps_avg_packet_size <= TFRC_MAX_PACKET_SIZE)
|
|
hcrx->ccid3hcrx_s = (u16)dp->dccps_avg_packet_size;
|
|
else
|
|
hcrx->ccid3hcrx_s = TFRC_STD_PACKET_SIZE;
|
|
|
|
hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA;
|
|
INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist);
|
|
INIT_LIST_HEAD(&hcrx->ccid3hcrx_loss_interval_hist);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ccid3_hc_rx_exit(struct sock *sk)
|
|
{
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
|
|
|
|
ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
|
|
|
|
if (hcrx == NULL)
|
|
return;
|
|
|
|
ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM);
|
|
|
|
/* Empty packet history */
|
|
dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist);
|
|
|
|
/* Empty loss interval history */
|
|
ccid3_loss_interval_history_delete(&hcrx->ccid3hcrx_loss_interval_hist);
|
|
|
|
kfree(dp->dccps_hc_rx_ccid_private);
|
|
dp->dccps_hc_rx_ccid_private = NULL;
|
|
}
|
|
|
|
static struct ccid ccid3 = {
|
|
.ccid_id = 3,
|
|
.ccid_name = "ccid3",
|
|
.ccid_owner = THIS_MODULE,
|
|
.ccid_init = ccid3_init,
|
|
.ccid_exit = ccid3_exit,
|
|
.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_insert_options = ccid3_hc_tx_insert_options,
|
|
.ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options,
|
|
.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,
|
|
};
|
|
|
|
module_param(ccid3_debug, int, 0444);
|
|
MODULE_PARM_DESC(ccid3_debug, "Enable debug messages");
|
|
|
|
static __init int ccid3_module_init(void)
|
|
{
|
|
int rc = -ENOBUFS;
|
|
|
|
ccid3_rx_hist = dccp_rx_hist_new("ccid3");
|
|
if (ccid3_rx_hist == NULL)
|
|
goto out;
|
|
|
|
ccid3_tx_hist = dccp_tx_hist_new("ccid3");
|
|
if (ccid3_tx_hist == NULL)
|
|
goto out_free_rx;
|
|
|
|
ccid3_loss_interval_hist_slab = kmem_cache_create("li_hist_ccid3",
|
|
sizeof(struct ccid3_loss_interval_hist_entry),
|
|
0, SLAB_HWCACHE_ALIGN,
|
|
NULL, NULL);
|
|
if (ccid3_loss_interval_hist_slab == NULL)
|
|
goto out_free_tx;
|
|
|
|
rc = ccid_register(&ccid3);
|
|
if (rc != 0)
|
|
goto out_free_loss_interval_history;
|
|
out:
|
|
return rc;
|
|
|
|
out_free_loss_interval_history:
|
|
kmem_cache_destroy(ccid3_loss_interval_hist_slab);
|
|
ccid3_loss_interval_hist_slab = NULL;
|
|
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;
|
|
goto out;
|
|
}
|
|
module_init(ccid3_module_init);
|
|
|
|
static __exit void ccid3_module_exit(void)
|
|
{
|
|
#ifdef CONFIG_IP_DCCP_UNLOAD_HACK
|
|
/*
|
|
* Hack to use while developing, so that we get rid of the control
|
|
* sock, that is what keeps a refcount on dccp.ko -acme
|
|
*/
|
|
extern void dccp_ctl_sock_exit(void);
|
|
|
|
dccp_ctl_sock_exit();
|
|
#endif
|
|
ccid_unregister(&ccid3);
|
|
|
|
if (ccid3_tx_hist != NULL) {
|
|
dccp_tx_hist_delete(ccid3_tx_hist);
|
|
ccid3_tx_hist = NULL;
|
|
}
|
|
if (ccid3_rx_hist != NULL) {
|
|
dccp_rx_hist_delete(ccid3_rx_hist);
|
|
ccid3_rx_hist = NULL;
|
|
}
|
|
if (ccid3_loss_interval_hist_slab != NULL) {
|
|
kmem_cache_destroy(ccid3_loss_interval_hist_slab);
|
|
ccid3_loss_interval_hist_slab = NULL;
|
|
}
|
|
}
|
|
module_exit(ccid3_module_exit);
|
|
|
|
MODULE_AUTHOR("Ian McDonald <iam4@cs.waikato.ac.nz> & Arnaldo Carvalho de Melo <acme@ghostprotocols.net>");
|
|
MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("net-dccp-ccid-3");
|