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tc.c
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tc.c
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/********************************************************************\
* 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, contact: *
* *
* Free Software Foundation Voice: +1-617-542-5942 *
* 59 Temple Place - Suite 330 Fax: +1-617-542-2652 *
* Boston, MA 02111-1307, USA gnu@gnu.org *
* *
\********************************************************************/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <syslog.h>
#include <errno.h>
#include <string.h>
#include <pthread.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "common.h"
#include "safe.h"
#include "conf.h"
#include "auth.h"
#include "fw_iptables.h"
#include "firewall.h"
#include "debug.h"
#include "util.h"
#include "client_list.h"
#include "tc.h"
/**
* Make this nonzero to supress the error output during destruction.
*/
static int tc_quiet = 0;
/** @internal */
static int
tc_do_command(char *format, ...) {
va_list vlist;
char *fmt_cmd;
char *cmd;
int rc;
va_start(vlist, format);
safe_vasprintf(&fmt_cmd, format, vlist);
va_end(vlist);
safe_asprintf(&cmd, "tc %s", fmt_cmd);
free(fmt_cmd);
debug(LOG_DEBUG, "Executing command: %s", cmd);
rc = execute(cmd, tc_quiet);
free(cmd);
return rc;
}
/* Use HTB as a upload qdisc.
* dev is name of device to attach qdisc to (typically an IMQ)
* upload_limit is in kbits/s
* Some ideas here from Rudy's qos-scripts
* http://forum.openwrt.org/viewtopic.php?id=4112&p=1
*/
static int
tc_attach_upload_qdisc(char *dev, int upload_limit) {
int burst;
int mtu = MTU + 40;
int rc = 0;
int r2q = 10;
/* to avoid some kernel warnings with small rates */
if(upload_limit < 120) r2q = 1;
burst = upload_limit * 1000 / 8 / HZ; /* burst (buffer size) in bytes */
burst = burst < mtu ? mtu : burst; /* but burst should be at least mtu */
rc |= tc_do_command("qdisc add dev %s root handle 1: htb default 1 r2q %d", dev,r2q);
rc |= tc_do_command("class add dev %s parent 1: classid 1:1 htb rate %dkbit ceil %dkbit burst %d cburst %d mtu %d prio 1",
dev, upload_limit, upload_limit, burst*2, burst, mtu);
return rc;
}
/* Use HTB as a download qdisc.
* dev is name of device to attach qdisc to (typically an IMQ)
* download_limit is in kbits/s
* Some ideas here from Rudy's qos-scripts
* http://forum.openwrt.org/viewtopic.php?id=4112&p=1
*/
static int
tc_attach_download_qdisc(char *dev, int download_limit) {
int burst;
int mtu = MTU + 40;
int rc = 0;
int r2q = 10;
/* to avoid some kernel warnings with small rates */
if(download_limit < 120) r2q = 1;
burst = download_limit * 1000 / 8 / HZ; /* burst (buffer size) in bytes */
burst = burst < mtu ? mtu : burst; /* but burst should be at least mtu */
rc |= tc_do_command("qdisc add dev %s root handle 1: htb default 1 r2q %d", dev, r2q);
rc |= tc_do_command("class add dev %s parent 1: classid 1:1 htb rate %dkbit ceil %dkbit burst %d cburst %d mtu %d prio 1",
dev, download_limit, download_limit, burst*2, burst, mtu);
return rc;
}
/**
* Bring up intermediate queueing devices, and attach qdiscs to them.
* PRE: mangle table chains CHAIN_INCOMING, CHAIN_OUTGOING must exist;
* see fw_iptables.c
*/
int
tc_init_tc() {
int upload_limit, download_limit;
int upload_imq, download_imq;
char *download_imqname, *upload_imqname, *cmd;
s_config *config;
int rc = 0, ret = 0;
config = config_get_config();
download_limit = config->download_limit;
upload_limit = config->upload_limit;
download_imq = config->download_imq;
upload_imq = config->upload_imq;
safe_asprintf(&download_imqname,"imq%d",download_imq); /* must free */
safe_asprintf(&upload_imqname,"imq%d",upload_imq); /* must free */
tc_quiet = 0;
if(download_limit > 0) {
safe_asprintf(&cmd,"ip link set %s up", download_imqname);
ret = execute(cmd ,tc_quiet);
free(cmd);
if( ret != 0 ) {
debug(LOG_ERR, "Could not set %s up. Download limiting will not work",
download_imqname);
} else {
/* jump to the imq in mangle CHAIN_INCOMING */
rc |= iptables_do_command("-t mangle -A " CHAIN_INCOMING " -j IMQ --todev %d ", download_imq);
/* attach download shaping qdisc to this imq */
rc |= tc_attach_download_qdisc(download_imqname,download_limit);
}
}
if(upload_limit > 0) {
safe_asprintf(&cmd,"ip link set %s up", upload_imqname);
ret = execute(cmd ,tc_quiet);
free(cmd);
if( ret != 0 ) {
debug(LOG_ERR, "Could not set %s up. Upload limiting will not work",
upload_imqname);
rc = -1;
} else {
/* jump to the imq in mangle CHAIN_OUTGOING */
rc |= iptables_do_command("-t mangle -A " CHAIN_OUTGOING " -j IMQ --todev %d ", upload_imq);
/* attach upload shaping qdisc to this imq */
rc |= tc_attach_upload_qdisc(upload_imqname,upload_limit);
}
}
free(download_imqname);
free(upload_imqname);
}
/**
* Remove qdiscs from intermediate queueing devices, and bring IMQ's down
*/
int
tc_destroy_tc() {
int rc = 0, old_tc_quiet;
old_tc_quiet = tc_quiet;
tc_quiet = 1;
s_config *config;
char *download_imqname, *upload_imqname, *cmd;
config = config_get_config();
safe_asprintf(&download_imqname,"imq%d",config->download_imq); /* must free */
safe_asprintf(&upload_imqname,"imq%d",config->upload_imq); /* must free */
/* remove qdiscs from imq's */
rc |= tc_do_command("qdisc del dev %s root",download_imqname);
rc |= tc_do_command("qdisc del dev %s root",upload_imqname);
/* bring down imq's */
safe_asprintf(&cmd,"ip link set %s down", download_imqname);
debug(LOG_DEBUG, "Executing command: %s", cmd);
rc |= execute(cmd,tc_quiet);
free(cmd);
debug(LOG_DEBUG, "Executing command: %s", cmd);
safe_asprintf(&cmd,"ip link set %s down", upload_imqname);
rc |= execute(cmd,tc_quiet);
free(cmd);
free(upload_imqname);
free(download_imqname);
tc_quiet = old_tc_quiet;
return rc;
}