You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1214 lines
34 KiB
1214 lines
34 KiB
/*
|
|
* net/dccp/ccids/ccid3.c
|
|
*
|
|
* Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
|
|
* Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.nz>
|
|
*
|
|
* An implementation of the DCCP protocol
|
|
*
|
|
* This code has been developed by the University of Waikato WAND
|
|
* research group. For further information please see http://www.wand.net.nz/
|
|
*
|
|
* This code also uses code from Lulea University, rereleased as GPL by its
|
|
* authors:
|
|
* Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
|
|
*
|
|
* Changes to meet Linux coding standards, to make it meet latest ccid3 draft
|
|
* and to make it work as a loadable module in the DCCP stack written by
|
|
* Arnaldo Carvalho de Melo <acme@conectiva.com.br>.
|
|
*
|
|
* Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include "../ccid.h"
|
|
#include "../dccp.h"
|
|
#include "lib/packet_history.h"
|
|
#include "lib/loss_interval.h"
|
|
#include "lib/tfrc.h"
|
|
#include "ccid3.h"
|
|
|
|
/*
|
|
* Reason for maths here is to avoid 32 bit overflow when a is big.
|
|
* With this we get close to the limit.
|
|
*/
|
|
static inline u32 usecs_div(const u32 a, const u32 b)
|
|
{
|
|
const u32 div = a < (UINT_MAX / (USEC_PER_SEC / 10)) ? 10 :
|
|
a < (UINT_MAX / (USEC_PER_SEC / 50)) ? 50 :
|
|
a < (UINT_MAX / (USEC_PER_SEC / 100)) ? 100 :
|
|
a < (UINT_MAX / (USEC_PER_SEC / 500)) ? 500 :
|
|
a < (UINT_MAX / (USEC_PER_SEC / 1000)) ? 1000 :
|
|
a < (UINT_MAX / (USEC_PER_SEC / 5000)) ? 5000 :
|
|
a < (UINT_MAX / (USEC_PER_SEC / 10000)) ? 10000 :
|
|
a < (UINT_MAX / (USEC_PER_SEC / 50000)) ? 50000 :
|
|
100000;
|
|
const u32 tmp = a * (USEC_PER_SEC / div);
|
|
return (b >= 2 * div) ? tmp / (b / div) : tmp;
|
|
}
|
|
|
|
static int ccid3_debug;
|
|
|
|
#ifdef CCID3_DEBUG
|
|
#define ccid3_pr_debug(format, a...) \
|
|
do { if (ccid3_debug) \
|
|
printk(KERN_DEBUG "%s: " format, __FUNCTION__, ##a); \
|
|
} while (0)
|
|
#else
|
|
#define ccid3_pr_debug(format, a...)
|
|
#endif
|
|
|
|
static struct dccp_tx_hist *ccid3_tx_hist;
|
|
static struct dccp_rx_hist *ccid3_rx_hist;
|
|
static struct dccp_li_hist *ccid3_li_hist;
|
|
|
|
static int ccid3_init(struct sock *sk)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void ccid3_exit(struct sock *sk)
|
|
{
|
|
}
|
|
|
|
/* TFRC sender states */
|
|
enum ccid3_hc_tx_states {
|
|
TFRC_SSTATE_NO_SENT = 1,
|
|
TFRC_SSTATE_NO_FBACK,
|
|
TFRC_SSTATE_FBACK,
|
|
TFRC_SSTATE_TERM,
|
|
};
|
|
|
|
#ifdef CCID3_DEBUG
|
|
static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state)
|
|
{
|
|
static char *ccid3_state_names[] = {
|
|
[TFRC_SSTATE_NO_SENT] = "NO_SENT",
|
|
[TFRC_SSTATE_NO_FBACK] = "NO_FBACK",
|
|
[TFRC_SSTATE_FBACK] = "FBACK",
|
|
[TFRC_SSTATE_TERM] = "TERM",
|
|
};
|
|
|
|
return ccid3_state_names[state];
|
|
}
|
|
#endif
|
|
|
|
static inline void ccid3_hc_tx_set_state(struct sock *sk,
|
|
enum ccid3_hc_tx_states state)
|
|
{
|
|
struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
|
|
enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state;
|
|
|
|
ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
|
|
dccp_role(sk), sk, ccid3_tx_state_name(oldstate),
|
|
ccid3_tx_state_name(state));
|
|
WARN_ON(state == oldstate);
|
|
hctx->ccid3hctx_state = state;
|
|
}
|
|
|
|
/* 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 no feedback spec says t_ipi is 1 second (set elsewhere and then
|
|
* doubles after every no feedback timer (separate function)
|
|
*/
|
|
if (hctx->ccid3hctx_state != TFRC_SSTATE_NO_FBACK)
|
|
hctx->ccid3hctx_t_ipi = usecs_div(hctx->ccid3hctx_s,
|
|
hctx->ccid3hctx_x);
|
|
}
|
|
|
|
/* 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 ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
|
|
|
|
/* To avoid large error in calcX */
|
|
if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) {
|
|
hctx->ccid3hctx_x_calc = tfrc_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 {
|
|
struct timeval now;
|
|
|
|
dccp_timestamp(sk, &now);
|
|
if (timeval_delta(&now, &hctx->ccid3hctx_t_ld) >=
|
|
hctx->ccid3hctx_rtt) {
|
|
hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_recv,
|
|
hctx->ccid3hctx_x) * 2,
|
|
usecs_div(hctx->ccid3hctx_s,
|
|
hctx->ccid3hctx_rtt));
|
|
hctx->ccid3hctx_t_ld = now;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void ccid3_hc_tx_no_feedback_timer(unsigned long data)
|
|
{
|
|
struct sock *sk = (struct sock *)data;
|
|
unsigned long next_tmout = 0;
|
|
struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
|
|
|
|
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));
|
|
|
|
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 * usecs_div(hctx->ccid3hctx_s,
|
|
hctx->ccid3hctx_x),
|
|
TFRC_INITIAL_TIMEOUT);
|
|
/*
|
|
* 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
|
|
*/
|
|
if (!hctx->ccid3hctx_idle ||
|
|
(hctx->ccid3hctx_x_recv >=
|
|
4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) {
|
|
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);
|
|
}
|
|
/*
|
|
* Schedule no feedback timer to expire in
|
|
* max(4 * R, 2 * s / X)
|
|
*/
|
|
next_tmout = max_t(u32, hctx->ccid3hctx_t_rto,
|
|
2 * usecs_div(hctx->ccid3hctx_s,
|
|
hctx->ccid3hctx_x));
|
|
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 = ccid3_hc_tx_sk(sk);
|
|
struct dccp_tx_hist_entry *new_packet;
|
|
struct timeval now;
|
|
long delay;
|
|
int rc = -ENOTCONN;
|
|
|
|
BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM);
|
|
|
|
/* 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 (unlikely(len == 0))
|
|
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 (unlikely(new_packet == NULL)) {
|
|
LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, not enough "
|
|
"mem to add to history, send refused\n",
|
|
__FUNCTION__, dccp_role(sk), sk);
|
|
goto out;
|
|
}
|
|
|
|
dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet);
|
|
}
|
|
|
|
dccp_timestamp(sk, &now);
|
|
|
|
switch (hctx->ccid3hctx_state) {
|
|
case TFRC_SSTATE_NO_SENT:
|
|
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_IPI;
|
|
|
|
/* Set nominal send time for initial packet */
|
|
hctx->ccid3hctx_t_nom = now;
|
|
timeval_add_usecs(&hctx->ccid3hctx_t_nom,
|
|
hctx->ccid3hctx_t_ipi);
|
|
ccid3_calc_new_delta(hctx);
|
|
rc = 0;
|
|
break;
|
|
case TFRC_SSTATE_NO_FBACK:
|
|
case TFRC_SSTATE_FBACK:
|
|
delay = (timeval_delta(&now, &hctx->ccid3hctx_t_nom) -
|
|
hctx->ccid3hctx_delta);
|
|
delay /= -1000;
|
|
/* divide by -1000 is to convert to ms and get sign right */
|
|
rc = delay > 0 ? delay : 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) {
|
|
dp->dccps_hc_tx_insert_options = 1;
|
|
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)
|
|
{
|
|
const struct dccp_sock *dp = dccp_sk(sk);
|
|
struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
|
|
struct timeval now;
|
|
|
|
BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM);
|
|
|
|
dccp_timestamp(sk, &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 (unlikely(packet == NULL)) {
|
|
LIMIT_NETDEBUG(KERN_WARNING "%s: packet doesn't "
|
|
"exists in history!\n", __FUNCTION__);
|
|
return;
|
|
}
|
|
if (unlikely(packet->dccphtx_sent)) {
|
|
LIMIT_NETDEBUG(KERN_WARNING "%s: no unsent packet in "
|
|
"history!\n", __FUNCTION__);
|
|
return;
|
|
}
|
|
packet->dccphtx_tstamp = now;
|
|
packet->dccphtx_seqno = dp->dccps_gss;
|
|
/*
|
|
* Check if win_count have changed
|
|
* Algorithm in "8.1. Window Counter Valuer" in
|
|
* draft-ietf-dccp-ccid3-11.txt
|
|
*/
|
|
quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count);
|
|
if (likely(hctx->ccid3hctx_rtt > 8))
|
|
quarter_rtt /= 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);
|
|
}
|
|
|
|
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);
|
|
timeval_add_usecs(&hctx->ccid3hctx_t_nom,
|
|
hctx->ccid3hctx_t_ipi);
|
|
}
|
|
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)
|
|
{
|
|
const struct dccp_sock *dp = dccp_sk(sk);
|
|
struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
|
|
struct ccid3_options_received *opt_recv;
|
|
struct dccp_tx_hist_entry *packet;
|
|
struct timeval now;
|
|
unsigned long next_tmout;
|
|
u32 t_elapsed;
|
|
u32 pinv;
|
|
u32 x_recv;
|
|
u32 r_sample;
|
|
|
|
BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM);
|
|
|
|
/* 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 * 10;
|
|
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 (unlikely(packet == NULL)) {
|
|
LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, seqno "
|
|
"%llu(%s) does't exist in history!\n",
|
|
__FUNCTION__, dccp_role(sk), sk,
|
|
(unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq,
|
|
dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type));
|
|
return;
|
|
}
|
|
|
|
/* Update RTT */
|
|
dccp_timestamp(sk, &now);
|
|
r_sample = timeval_delta(&now, &packet->dccphtx_tstamp);
|
|
if (unlikely(r_sample <= t_elapsed))
|
|
LIMIT_NETDEBUG(KERN_WARNING "%s: r_sample=%uus, "
|
|
"t_elapsed=%uus\n",
|
|
__FUNCTION__, r_sample, t_elapsed);
|
|
else
|
|
r_sample -= t_elapsed;
|
|
|
|
/* 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;
|
|
|
|
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 sec */
|
|
|
|
/* 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 */
|
|
timeval_sub_usecs(&hctx->ccid3hctx_t_nom,
|
|
hctx->ccid3hctx_t_ipi);
|
|
ccid3_calc_new_t_ipi(hctx);
|
|
timeval_add_usecs(&hctx->ccid3hctx_t_nom,
|
|
hctx->ccid3hctx_t_ipi);
|
|
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);
|
|
/*
|
|
* 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_ccids.
|
|
*/
|
|
sk->sk_write_space(sk);
|
|
|
|
/*
|
|
* Schedule no feedback timer to expire in
|
|
* max(4 * R, 2 * s / X)
|
|
*/
|
|
next_tmout = max(hctx->ccid3hctx_t_rto,
|
|
2 * usecs_div(hctx->ccid3hctx_s,
|
|
hctx->ccid3hctx_x));
|
|
|
|
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 ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
|
|
|
|
BUG_ON(hctx == NULL);
|
|
|
|
if (!(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;
|
|
const struct dccp_sock *dp = dccp_sk(sk);
|
|
struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
|
|
struct ccid3_options_received *opt_recv;
|
|
|
|
BUG_ON(hctx == NULL);
|
|
|
|
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 (unlikely(len != 4)) {
|
|
LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, invalid "
|
|
"len for TFRC_OPT_LOSS_EVENT_RATE\n",
|
|
__FUNCTION__, 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 (unlikely(len != 4)) {
|
|
LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, invalid "
|
|
"len for TFRC_OPT_RECEIVE_RATE\n",
|
|
__FUNCTION__, 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;
|
|
|
|
dp->dccps_hc_tx_ccid_private = kmalloc(sizeof(*hctx), gfp_any());
|
|
if (dp->dccps_hc_tx_ccid_private == NULL)
|
|
return -ENOMEM;
|
|
|
|
hctx = ccid3_hc_tx_sk(sk);
|
|
memset(hctx, 0, sizeof(*hctx));
|
|
|
|
if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE &&
|
|
dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE)
|
|
hctx->ccid3hctx_s = dp->dccps_packet_size;
|
|
else
|
|
hctx->ccid3hctx_s = TFRC_STD_PACKET_SIZE;
|
|
|
|
/* Set transmission rate to 1 packet per second */
|
|
hctx->ccid3hctx_x = hctx->ccid3hctx_s;
|
|
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 = ccid3_hc_tx_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 ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
|
|
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 void ccid3_hc_rx_send_feedback(struct sock *sk)
|
|
{
|
|
struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
struct dccp_rx_hist_entry *packet;
|
|
struct timeval now;
|
|
|
|
ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
|
|
|
|
dccp_timestamp(sk, &now);
|
|
|
|
switch (hcrx->ccid3hcrx_state) {
|
|
case TFRC_RSTATE_NO_DATA:
|
|
hcrx->ccid3hcrx_x_recv = 0;
|
|
break;
|
|
case TFRC_RSTATE_DATA: {
|
|
const u32 delta = timeval_delta(&now,
|
|
&hcrx->ccid3hcrx_tstamp_last_feedback);
|
|
hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv,
|
|
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 (unlikely(packet == NULL)) {
|
|
LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, no data packet "
|
|
"in history!\n",
|
|
__FUNCTION__, dccp_role(sk), sk);
|
|
return;
|
|
}
|
|
|
|
hcrx->ccid3hcrx_tstamp_last_feedback = now;
|
|
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 =
|
|
timeval_delta(&now, &packet->dccphrx_tstamp) / 10;
|
|
if (hcrx->ccid3hcrx_p == 0)
|
|
hcrx->ccid3hcrx_pinv = ~0;
|
|
else
|
|
hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p;
|
|
dp->dccps_hc_rx_insert_options = 1;
|
|
dccp_send_ack(sk);
|
|
}
|
|
|
|
static void ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
|
|
u32 x_recv, pinv;
|
|
|
|
BUG_ON(hcrx == NULL);
|
|
|
|
if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN))
|
|
return;
|
|
|
|
DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_last_counter;
|
|
|
|
if (dccp_packet_without_ack(skb))
|
|
return;
|
|
|
|
if (hcrx->ccid3hcrx_elapsed_time != 0)
|
|
dccp_insert_option_elapsed_time(sk, skb,
|
|
hcrx->ccid3hcrx_elapsed_time);
|
|
dccp_insert_option_timestamp(sk, skb);
|
|
x_recv = htonl(hcrx->ccid3hcrx_x_recv);
|
|
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));
|
|
}
|
|
|
|
/* calculate first loss interval
|
|
*
|
|
* returns estimated loss interval in usecs */
|
|
|
|
static u32 ccid3_hc_rx_calc_first_li(struct sock *sk)
|
|
{
|
|
struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
|
|
struct dccp_rx_hist_entry *entry, *next, *tail = NULL;
|
|
u32 rtt, delta, x_recv, fval, p, tmp2;
|
|
struct timeval tstamp = { 0, };
|
|
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 (unlikely(step == 0)) {
|
|
LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, packet history "
|
|
"contains no data packets!\n",
|
|
__FUNCTION__, dccp_role(sk), sk);
|
|
return ~0;
|
|
}
|
|
|
|
if (unlikely(interval == 0)) {
|
|
LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, Could not find a "
|
|
"win_count interval > 0. Defaulting to 1\n",
|
|
__FUNCTION__, dccp_role(sk), sk);
|
|
interval = 1;
|
|
}
|
|
found:
|
|
rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval;
|
|
ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n",
|
|
dccp_role(sk), sk, rtt);
|
|
if (rtt == 0)
|
|
rtt = 1;
|
|
|
|
dccp_timestamp(sk, &tstamp);
|
|
delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback);
|
|
x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, 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 = tfrc_calc_x_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 ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
|
|
|
|
if (seq_loss != DCCP_MAX_SEQNO + 1 &&
|
|
list_empty(&hcrx->ccid3hcrx_li_hist)) {
|
|
struct dccp_li_hist_entry *li_tail;
|
|
|
|
li_tail = dccp_li_hist_interval_new(ccid3_li_hist,
|
|
&hcrx->ccid3hcrx_li_hist,
|
|
seq_loss, win_loss);
|
|
if (li_tail == NULL)
|
|
return;
|
|
li_tail->dccplih_interval = ccid3_hc_rx_calc_first_li(sk);
|
|
} else
|
|
LIMIT_NETDEBUG(KERN_WARNING "%s: FIXME: find end of "
|
|
"interval\n", __FUNCTION__);
|
|
}
|
|
|
|
static void ccid3_hc_rx_detect_loss(struct sock *sk)
|
|
{
|
|
struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
|
|
u8 win_loss;
|
|
const u64 seq_loss = dccp_rx_hist_detect_loss(&hcrx->ccid3hcrx_hist,
|
|
&hcrx->ccid3hcrx_li_hist,
|
|
&win_loss);
|
|
|
|
ccid3_hc_rx_update_li(sk, seq_loss, win_loss);
|
|
}
|
|
|
|
static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
|
|
const struct dccp_options_received *opt_recv;
|
|
struct dccp_rx_hist_entry *packet;
|
|
struct timeval now;
|
|
u8 win_count;
|
|
u32 p_prev, r_sample, t_elapsed;
|
|
int ins;
|
|
|
|
BUG_ON(hcrx == NULL ||
|
|
!(hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA ||
|
|
hcrx->ccid3hcrx_state == TFRC_RSTATE_DATA));
|
|
|
|
opt_recv = &dccp_sk(sk)->dccps_options_received;
|
|
|
|
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 (opt_recv->dccpor_timestamp_echo == 0)
|
|
break;
|
|
p_prev = hcrx->ccid3hcrx_rtt;
|
|
dccp_timestamp(sk, &now);
|
|
timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10);
|
|
r_sample = timeval_usecs(&now);
|
|
t_elapsed = opt_recv->dccpor_elapsed_time * 10;
|
|
|
|
if (unlikely(r_sample <= t_elapsed))
|
|
LIMIT_NETDEBUG(KERN_WARNING "%s: r_sample=%uus, "
|
|
"t_elapsed=%uus\n",
|
|
__FUNCTION__, r_sample, t_elapsed);
|
|
else
|
|
r_sample -= t_elapsed;
|
|
|
|
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;
|
|
|
|
if (p_prev != hcrx->ccid3hcrx_rtt)
|
|
ccid3_pr_debug("%s, New RTT=%luus, elapsed time=%u\n",
|
|
dccp_role(sk), hcrx->ccid3hcrx_rtt,
|
|
opt_recv->dccpor_elapsed_time);
|
|
break;
|
|
case DCCP_PKT_DATA:
|
|
break;
|
|
default: /* We're not interested in other packet types, move along */
|
|
return;
|
|
}
|
|
|
|
packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp,
|
|
skb, SLAB_ATOMIC);
|
|
if (unlikely(packet == NULL)) {
|
|
LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, Not enough mem to "
|
|
"add rx packet to history, consider it lost!\n",
|
|
__FUNCTION__, dccp_role(sk), sk);
|
|
return;
|
|
}
|
|
|
|
win_count = packet->dccphrx_ccval;
|
|
|
|
ins = dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist,
|
|
&hcrx->ccid3hcrx_li_hist, 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)
|
|
break;
|
|
|
|
dccp_timestamp(sk, &now);
|
|
if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >=
|
|
hcrx->ccid3hcrx_rtt) {
|
|
hcrx->ccid3hcrx_tstamp_last_ack = now;
|
|
ccid3_hc_rx_send_feedback(sk);
|
|
}
|
|
return;
|
|
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), data loss! Reacting...\n",
|
|
dccp_role(sk), sk, dccp_state_name(sk->sk_state));
|
|
|
|
ccid3_hc_rx_detect_loss(sk);
|
|
p_prev = hcrx->ccid3hcrx_p;
|
|
|
|
/* Calculate loss event rate */
|
|
if (!list_empty(&hcrx->ccid3hcrx_li_hist))
|
|
/* Scaling up by 1000000 as fixed decimal */
|
|
hcrx->ccid3hcrx_p = 1000000 / dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist);
|
|
|
|
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);
|
|
|
|
dp->dccps_hc_rx_ccid_private = kmalloc(sizeof(*hcrx), gfp_any());
|
|
if (dp->dccps_hc_rx_ccid_private == NULL)
|
|
return -ENOMEM;
|
|
|
|
hcrx = ccid3_hc_rx_sk(sk);
|
|
memset(hcrx, 0, sizeof(*hcrx));
|
|
|
|
if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE &&
|
|
dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE)
|
|
hcrx->ccid3hcrx_s = dp->dccps_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_li_hist);
|
|
dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack);
|
|
hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack;
|
|
hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */
|
|
return 0;
|
|
}
|
|
|
|
static void ccid3_hc_rx_exit(struct sock *sk)
|
|
{
|
|
struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
|
|
BUG_ON(hcrx == NULL);
|
|
|
|
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 */
|
|
dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist);
|
|
|
|
kfree(dp->dccps_hc_rx_ccid_private);
|
|
dp->dccps_hc_rx_ccid_private = NULL;
|
|
}
|
|
|
|
static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info)
|
|
{
|
|
const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
|
|
|
|
/* Listen socks doesn't have a private CCID block */
|
|
if (sk->sk_state == DCCP_LISTEN)
|
|
return;
|
|
|
|
BUG_ON(hcrx == NULL);
|
|
|
|
info->tcpi_ca_state = hcrx->ccid3hcrx_state;
|
|
info->tcpi_options |= TCPI_OPT_TIMESTAMPS;
|
|
info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt;
|
|
}
|
|
|
|
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 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,
|
|
.ccid_hc_rx_get_info = ccid3_hc_rx_get_info,
|
|
.ccid_hc_tx_get_info = ccid3_hc_tx_get_info,
|
|
};
|
|
|
|
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_li_hist = dccp_li_hist_new("ccid3");
|
|
if (ccid3_li_hist == 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:
|
|
dccp_li_hist_delete(ccid3_li_hist);
|
|
ccid3_li_hist = 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_li_hist != NULL) {
|
|
dccp_li_hist_delete(ccid3_li_hist);
|
|
ccid3_li_hist = 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");
|
|
|