提交 5859034d 编写于 作者: P Patrick McHardy 提交者: David S. Miller

[NETFILTER]: x_tables: add RATEEST target

Add new rate estimator target (using gen_estimator). In combination with
the rateest match (next patch) this can be used for load-based multipath
routing.
Signed-off-by: NPatrick McHardy <kaber@trash.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 cb76c6a5
......@@ -10,6 +10,7 @@ header-y += xt_DSCP.h
header-y += xt_MARK.h
header-y += xt_NFLOG.h
header-y += xt_NFQUEUE.h
header-y += xt_RATEEST.h
header-y += xt_SECMARK.h
header-y += xt_TCPMSS.h
header-y += xt_comment.h
......
#ifndef _XT_RATEEST_TARGET_H
#define _XT_RATEEST_TARGET_H
struct xt_rateest_target_info {
char name[IFNAMSIZ];
int8_t interval;
u_int8_t ewma_log;
struct xt_rateest *est __attribute__((aligned(8)));
};
#endif /* _XT_RATEEST_TARGET_H */
#ifndef _XT_RATEEST_H
#define _XT_RATEEST_H
struct xt_rateest {
struct hlist_node list;
char name[IFNAMSIZ];
unsigned int refcnt;
spinlock_t lock;
struct gnet_estimator params;
struct gnet_stats_rate_est rstats;
struct gnet_stats_basic bstats;
};
extern struct xt_rateest *xt_rateest_lookup(const char *name);
extern void xt_rateest_put(struct xt_rateest *est);
#endif /* _XT_RATEEST_H */
......@@ -357,6 +357,16 @@ config NETFILTER_XT_TARGET_NOTRACK
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_TARGET_RATEEST
tristate '"RATEEST" target support'
depends on NETFILTER_XTABLES
help
This option adds a `RATEEST' target, which allows to measure
rates similar to TC estimators. The `rateest' match can be
used to match on the measured rates.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_TRACE
tristate '"TRACE" target support'
depends on NETFILTER_XTABLES
......
......@@ -46,6 +46,7 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_MARK) += xt_MARK.o
obj-$(CONFIG_NETFILTER_XT_TARGET_NFLOG) += xt_NFLOG.o
obj-$(CONFIG_NETFILTER_XT_TARGET_NFQUEUE) += xt_NFQUEUE.o
obj-$(CONFIG_NETFILTER_XT_TARGET_NOTRACK) += xt_NOTRACK.o
obj-$(CONFIG_NETFILTER_XT_TARGET_RATEEST) += xt_RATEEST.o
obj-$(CONFIG_NETFILTER_XT_TARGET_SECMARK) += xt_SECMARK.o
obj-$(CONFIG_NETFILTER_XT_TARGET_TCPMSS) += xt_TCPMSS.o
obj-$(CONFIG_NETFILTER_XT_TARGET_TCPOPTSTRIP) += xt_TCPOPTSTRIP.o
......
/*
* (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/jhash.h>
#include <linux/rtnetlink.h>
#include <linux/random.h>
#include <net/gen_stats.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_RATEEST.h>
#include <net/netfilter/xt_rateest.h>
static DEFINE_MUTEX(xt_rateest_mutex);
#define RATEEST_HSIZE 16
static struct hlist_head rateest_hash[RATEEST_HSIZE] __read_mostly;
static unsigned int jhash_rnd __read_mostly;
static unsigned int xt_rateest_hash(const char *name)
{
return jhash(name, FIELD_SIZEOF(struct xt_rateest, name), jhash_rnd) &
(RATEEST_HSIZE - 1);
}
static void xt_rateest_hash_insert(struct xt_rateest *est)
{
unsigned int h;
h = xt_rateest_hash(est->name);
hlist_add_head(&est->list, &rateest_hash[h]);
}
struct xt_rateest *xt_rateest_lookup(const char *name)
{
struct xt_rateest *est;
struct hlist_node *n;
unsigned int h;
h = xt_rateest_hash(name);
mutex_lock(&xt_rateest_mutex);
hlist_for_each_entry(est, n, &rateest_hash[h], list) {
if (strcmp(est->name, name) == 0) {
est->refcnt++;
mutex_unlock(&xt_rateest_mutex);
return est;
}
}
mutex_unlock(&xt_rateest_mutex);
return NULL;
}
EXPORT_SYMBOL_GPL(xt_rateest_lookup);
void xt_rateest_put(struct xt_rateest *est)
{
mutex_lock(&xt_rateest_mutex);
if (--est->refcnt == 0) {
hlist_del(&est->list);
gen_kill_estimator(&est->bstats, &est->rstats);
kfree(est);
}
mutex_unlock(&xt_rateest_mutex);
}
EXPORT_SYMBOL_GPL(xt_rateest_put);
static unsigned int
xt_rateest_tg(struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
unsigned int hooknum,
const struct xt_target *target,
const void *targinfo)
{
const struct xt_rateest_target_info *info = targinfo;
struct gnet_stats_basic *stats = &info->est->bstats;
spin_lock_bh(&info->est->lock);
stats->bytes += skb->len;
stats->packets++;
spin_unlock_bh(&info->est->lock);
return XT_CONTINUE;
}
static bool
xt_rateest_tg_checkentry(const char *tablename,
const void *entry,
const struct xt_target *target,
void *targinfo,
unsigned int hook_mask)
{
struct xt_rateest_target_info *info = (void *)targinfo;
struct xt_rateest *est;
struct {
struct rtattr opt;
struct gnet_estimator est;
} cfg;
est = xt_rateest_lookup(info->name);
if (est) {
/*
* If estimator parameters are specified, they must match the
* existing estimator.
*/
if ((!info->interval && !info->ewma_log) ||
(info->interval != est->params.interval ||
info->ewma_log != est->params.ewma_log)) {
xt_rateest_put(est);
return false;
}
info->est = est;
return true;
}
est = kzalloc(sizeof(*est), GFP_KERNEL);
if (!est)
goto err1;
strlcpy(est->name, info->name, sizeof(est->name));
spin_lock_init(&est->lock);
est->refcnt = 1;
est->params.interval = info->interval;
est->params.ewma_log = info->ewma_log;
cfg.opt.rta_len = RTA_LENGTH(sizeof(cfg.est));
cfg.opt.rta_type = TCA_STATS_RATE_EST;
cfg.est.interval = info->interval;
cfg.est.ewma_log = info->ewma_log;
if (gen_new_estimator(&est->bstats, &est->rstats, &est->lock,
&cfg.opt) < 0)
goto err2;
info->est = est;
xt_rateest_hash_insert(est);
return true;
err2:
kfree(est);
err1:
return false;
}
static void xt_rateest_tg_destroy(const struct xt_target *target,
void *targinfo)
{
struct xt_rateest_target_info *info = targinfo;
xt_rateest_put(info->est);
}
static struct xt_target xt_rateest_target[] __read_mostly = {
{
.family = AF_INET,
.name = "RATEEST",
.target = xt_rateest_tg,
.checkentry = xt_rateest_tg_checkentry,
.destroy = xt_rateest_tg_destroy,
.targetsize = sizeof(struct xt_rateest_target_info),
.me = THIS_MODULE,
},
{
.family = AF_INET6,
.name = "RATEEST",
.target = xt_rateest_tg,
.checkentry = xt_rateest_tg_checkentry,
.destroy = xt_rateest_tg_destroy,
.targetsize = sizeof(struct xt_rateest_target_info),
.me = THIS_MODULE,
},
};
static int __init xt_rateest_tg_init(void)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(rateest_hash); i++)
INIT_HLIST_HEAD(&rateest_hash[i]);
get_random_bytes(&jhash_rnd, sizeof(jhash_rnd));
return xt_register_targets(xt_rateest_target,
ARRAY_SIZE(xt_rateest_target));
}
static void __exit xt_rateest_tg_fini(void)
{
xt_unregister_targets(xt_rateest_target, ARRAY_SIZE(xt_rateest_target));
}
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("xtables rate estimator");
MODULE_ALIAS("ipt_RATEEST");
MODULE_ALIAS("ip6t_RATEEST");
module_init(xt_rateest_tg_init);
module_exit(xt_rateest_tg_fini);
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