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[NETFILTER]: x_tables: add rateest match

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Add rate estimator match. The rate estimator match can match on
estimated rates by the RATEEST target. It supports matching on
absolute bps/pps values, comparing two rate estimators and matching
on the difference between two rate estimators.

This is what I use to route outgoing data connections from a FTP
server over two lines based on the  available bandwidth:

# estimate outgoing rates
iptables -t mangle -A POSTROUTING -o eth0 -j RATEEST --rateest-name eth0 \
                                                     --rateest-interval 250ms \
                                                     --rateest-ewma 0.5s
iptables -t mangle -A POSTROUTING -o ppp0 -j RATEEST --rateest-name ppp0 \
                                                     --rateest-interval 250ms \
                                                     --rateest-ewma 0.5s

# mark based on available bandwidth
iptables -t mangle -A BALANCE -m state --state NEW \
                              -m helper --helper ftp \
                              -m rateest --rateest-delta \
                                         --rateest1 eth0 \
                                         --rateest-bps1 2.5mbit \
                                         --rateest-gt \
                                         --rateest2 ppp0 \
                                         --rateest-bps2 2mbit \
                              -j CONNMARK --set-mark 0x1

iptables -t mangle -A BALANCE -m state --state NEW \
                              -m helper --helper ftp \
                              -m rateest --rateest-delta \
                                         --rateest1 ppp0 \
                                         --rateest-bps1 2mbit \
                                         --rateest-gt \
                                         --rateest2 eth0 \
                                         --rateest-bps2 2.5mbit \
                              -j CONNMARK --set-mark 0x2

iptables -t mangle -A BALANCE -j CONNMARK --restore-mark

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2007-12-04 13:02:19 +01:00 committed by David S. Miller
parent 5859034d7e
commit 50c164a81f
5 changed files with 223 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/netfilter/Kbuild
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@ -30,6 +30,7 @@ header-y += xt_multiport.h
header-y += xt_owner.h
header-y += xt_pkttype.h
header-y += xt_policy.h
header-y += xt_rateest.h
header-y += xt_realm.h
header-y += xt_sctp.h
header-y += xt_state.h

33
include/linux/netfilter/xt_rateest.h Normal file
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@ -0,0 +1,33 @@
#ifndef _XT_RATEEST_MATCH_H
#define _XT_RATEEST_MATCH_H
enum xt_rateest_match_flags {
XT_RATEEST_MATCH_INVERT = 1<<0,
XT_RATEEST_MATCH_ABS = 1<<1,
XT_RATEEST_MATCH_REL = 1<<2,
XT_RATEEST_MATCH_DELTA = 1<<3,
XT_RATEEST_MATCH_BPS = 1<<4,
XT_RATEEST_MATCH_PPS = 1<<5,
};
enum xt_rateest_match_mode {
XT_RATEEST_MATCH_NONE,
XT_RATEEST_MATCH_EQ,
XT_RATEEST_MATCH_LT,
XT_RATEEST_MATCH_GT,
};
struct xt_rateest_match_info {
char name1[IFNAMSIZ];
char name2[IFNAMSIZ];
u_int16_t flags;
u_int16_t mode;
u_int32_t bps1;
u_int32_t pps1;
u_int32_t bps2;
u_int32_t pps2;
struct xt_rateest *est1 __attribute__((aligned(8)));
struct xt_rateest *est2 __attribute__((aligned(8)));
};
#endif /* _XT_RATEEST_MATCH_H */

10
net/netfilter/Kconfig
View File

@ -631,6 +631,16 @@ config NETFILTER_XT_MATCH_QUOTA
If you want to compile it as a module, say M here and read
<file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
config NETFILTER_XT_MATCH_RATEEST
tristate '"rateest" match support'
depends on NETFILTER_XTABLES
select NETFILTER_XT_TARGET_RATEEST
help
This option adds a `rateest' match, which allows to match on the
rate estimated by the RATEEST target.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_REALM
tristate '"realm" match support'
depends on NETFILTER_XTABLES

1
net/netfilter/Makefile
View File

@ -73,6 +73,7 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_PHYSDEV) += xt_physdev.o
obj-$(CONFIG_NETFILTER_XT_MATCH_PKTTYPE) += xt_pkttype.o
obj-$(CONFIG_NETFILTER_XT_MATCH_POLICY) += xt_policy.o
obj-$(CONFIG_NETFILTER_XT_MATCH_QUOTA) += xt_quota.o
obj-$(CONFIG_NETFILTER_XT_MATCH_RATEEST) += xt_rateest.o
obj-$(CONFIG_NETFILTER_XT_MATCH_REALM) += xt_realm.o
obj-$(CONFIG_NETFILTER_XT_MATCH_SCTP) += xt_sctp.o
obj-$(CONFIG_NETFILTER_XT_MATCH_STATE) += xt_state.o

178
net/netfilter/xt_rateest.c Normal file
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@ -0,0 +1,178 @@
/*
* (C) 2007 Patrick McHardy <kaber@trash.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/gen_stats.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_rateest.h>
#include <net/netfilter/xt_rateest.h>
static bool xt_rateest_mt(const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
const struct xt_match *match,
const void *matchinfo,
int offset,
unsigned int protoff,
bool *hotdrop)
{
const struct xt_rateest_match_info *info = matchinfo;
struct gnet_stats_rate_est *r;
u_int32_t bps1, bps2, pps1, pps2;
bool ret = true;
spin_lock_bh(&info->est1->lock);
r = &info->est1->rstats;
if (info->flags & XT_RATEEST_MATCH_DELTA) {
bps1 = info->bps1 >= r->bps ? info->bps1 - r->bps : 0;
pps1 = info->pps1 >= r->pps ? info->pps1 - r->pps : 0;
} else {
bps1 = r->bps;
pps1 = r->pps;
}
spin_unlock_bh(&info->est1->lock);
if (info->flags & XT_RATEEST_MATCH_ABS) {
bps2 = info->bps2;
pps2 = info->pps2;
} else {
spin_lock_bh(&info->est2->lock);
r = &info->est2->rstats;
if (info->flags & XT_RATEEST_MATCH_DELTA) {
bps2 = info->bps2 >= r->bps ? info->bps2 - r->bps : 0;
pps2 = info->pps2 >= r->pps ? info->pps2 - r->pps : 0;
} else {
bps2 = r->bps;
pps2 = r->pps;
}
spin_unlock_bh(&info->est2->lock);
}
switch (info->mode) {
case XT_RATEEST_MATCH_LT:
if (info->flags & XT_RATEEST_MATCH_BPS)
ret &= bps1 < bps2;
if (info->flags & XT_RATEEST_MATCH_PPS)
ret &= pps1 < pps2;
break;
case XT_RATEEST_MATCH_GT:
if (info->flags & XT_RATEEST_MATCH_BPS)
ret &= bps1 > bps2;
if (info->flags & XT_RATEEST_MATCH_PPS)
ret &= pps1 > pps2;
break;
case XT_RATEEST_MATCH_EQ:
if (info->flags & XT_RATEEST_MATCH_BPS)
ret &= bps1 == bps2;
if (info->flags & XT_RATEEST_MATCH_PPS)
ret &= pps2 == pps2;
break;
}
ret ^= info->flags & XT_RATEEST_MATCH_INVERT ? true : false;
return ret;
}
static bool xt_rateest_mt_checkentry(const char *tablename,
const void *ip,
const struct xt_match *match,
void *matchinfo,
unsigned int hook_mask)
{
struct xt_rateest_match_info *info = (void *)matchinfo;
struct xt_rateest *est1, *est2;
if (hweight32(info->flags & (XT_RATEEST_MATCH_ABS |
XT_RATEEST_MATCH_REL)) != 1)
goto err1;
if (!(info->flags & (XT_RATEEST_MATCH_BPS | XT_RATEEST_MATCH_PPS)))
goto err1;
switch (info->mode) {
case XT_RATEEST_MATCH_EQ:
case XT_RATEEST_MATCH_LT:
case XT_RATEEST_MATCH_GT:
break;
default:
goto err1;
}
est1 = xt_rateest_lookup(info->name1);
if (!est1)
goto err1;
if (info->flags & XT_RATEEST_MATCH_REL) {
est2 = xt_rateest_lookup(info->name2);
if (!est2)
goto err2;
} else
est2 = NULL;
info->est1 = est1;
info->est2 = est2;
return true;
err2:
xt_rateest_put(est1);
err1:
return false;
}
static void xt_rateest_mt_destroy(const struct xt_match *match,
void *matchinfo)
{
struct xt_rateest_match_info *info = (void *)matchinfo;
xt_rateest_put(info->est1);
if (info->est2)
xt_rateest_put(info->est2);
}
static struct xt_match xt_rateest_match[] __read_mostly = {
{
.family = AF_INET,
.name = "rateest",
.match = xt_rateest_mt,
.checkentry = xt_rateest_mt_checkentry,
.destroy = xt_rateest_mt_destroy,
.matchsize = sizeof(struct xt_rateest_match_info),
.me = THIS_MODULE,
},
{
.family = AF_INET6,
.name = "rateest",
.match = xt_rateest_mt,
.checkentry = xt_rateest_mt_checkentry,
.destroy = xt_rateest_mt_destroy,
.matchsize = sizeof(struct xt_rateest_match_info),
.me = THIS_MODULE,
},
};
static int __init xt_rateest_mt_init(void)
{
return xt_register_matches(xt_rateest_match,
ARRAY_SIZE(xt_rateest_match));
}
static void __exit xt_rateest_mt_fini(void)
{
xt_unregister_matches(xt_rateest_match, ARRAY_SIZE(xt_rateest_match));
}
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("xtables rate estimator match");
MODULE_ALIAS("ipt_rateest");
MODULE_ALIAS("ip6t_rateest");
module_init(xt_rateest_mt_init);
module_exit(xt_rateest_mt_fini);