Commit 62b77434 authored by Patrick McHardy's avatar Patrick McHardy Committed by David S. Miller
Browse files

[NETFILTER]: x_tables: add quota match


Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 957dc80a
#ifndef _XT_QUOTA_H
#define _XT_QUOTA_H
enum xt_quota_flags {
XT_QUOTA_INVERT = 0x1,
};
#define XT_QUOTA_MASK 0x1
struct xt_quota_info {
u_int32_t flags;
u_int32_t pad;
aligned_u64 quota;
struct xt_quota_info *master;
};
#endif /* _XT_QUOTA_H */
......@@ -329,6 +329,16 @@ config NETFILTER_XT_MATCH_PKTTYPE
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_QUOTA
tristate '"quota" match support'
depends on NETFILTER_XTABLES
help
This option adds a `quota' match, which allows to match on a
byte counter.
If you want to compile it as a module, say M here and read
<file:Documentation/modules.txt>. If unsure, say `N'.
config NETFILTER_XT_MATCH_REALM
tristate '"realm" match support'
depends on NETFILTER_XTABLES
......
......@@ -44,6 +44,7 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_MARK) += xt_mark.o
obj-$(CONFIG_NETFILTER_XT_MATCH_MULTIPORT) += xt_multiport.o
obj-$(CONFIG_NETFILTER_XT_MATCH_POLICY) += xt_policy.o
obj-$(CONFIG_NETFILTER_XT_MATCH_PKTTYPE) += xt_pkttype.o
obj-$(CONFIG_NETFILTER_XT_MATCH_QUOTA) += xt_quota.o
obj-$(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
......
/*
* netfilter module to enforce network quotas
*
* Sam Johnston <samj@samj.net>
*/
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_quota.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Sam Johnston <samj@samj.net>");
static DEFINE_SPINLOCK(quota_lock);
static int
match(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, int *hotdrop)
{
struct xt_quota_info *q = ((struct xt_quota_info *)matchinfo)->master;
int ret = q->flags & XT_QUOTA_INVERT ? 1 : 0;
spin_lock_bh(&quota_lock);
if (q->quota >= skb->len) {
q->quota -= skb->len;
ret ^= 1;
} else {
/* we do not allow even small packets from now on */
q->quota = 0;
}
spin_unlock_bh(&quota_lock);
return ret;
}
static int
checkentry(const char *tablename, const void *entry,
const struct xt_match *match, void *matchinfo,
unsigned int matchsize, unsigned int hook_mask)
{
struct xt_quota_info *q = (struct xt_quota_info *)matchinfo;
if (q->flags & ~XT_QUOTA_MASK)
return 0;
/* For SMP, we only want to use one set of counters. */
q->master = q;
return 1;
}
static struct xt_match quota_match = {
.name = "quota",
.family = AF_INET,
.match = match,
.matchsize = sizeof(struct xt_quota_info),
.checkentry = checkentry,
.me = THIS_MODULE
};
static struct xt_match quota_match6 = {
.name = "quota",
.family = AF_INET6,
.match = match,
.matchsize = sizeof(struct xt_quota_info),
.checkentry = checkentry,
.me = THIS_MODULE
};
static int __init xt_quota_init(void)
{
int ret;
ret = xt_register_match(&quota_match);
if (ret)
goto err1;
ret = xt_register_match(&quota_match6);
if (ret)
goto err2;
return ret;
err2:
xt_unregister_match(&quota_match);
err1:
return ret;
}
static void __exit xt_quota_fini(void)
{
xt_unregister_match(&quota_match6);
xt_unregister_match(&quota_match);
}
module_init(xt_quota_init);
module_exit(xt_quota_fini);
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