efa741656e
The size is verified by x_tables and isn't needed by the modules anymore. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
/*
|
|
* 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>");
|
|
MODULE_ALIAS("ipt_quota");
|
|
MODULE_ALIAS("ip6t_quota");
|
|
|
|
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("a_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("a_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
checkentry(const char *tablename, const void *entry,
|
|
const struct xt_match *match, void *matchinfo,
|
|
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 xt_quota_match[] = {
|
|
{
|
|
.name = "quota",
|
|
.family = AF_INET,
|
|
.checkentry = checkentry,
|
|
.match = match,
|
|
.matchsize = sizeof(struct xt_quota_info),
|
|
.me = THIS_MODULE
|
|
},
|
|
{
|
|
.name = "quota",
|
|
.family = AF_INET6,
|
|
.checkentry = checkentry,
|
|
.match = match,
|
|
.matchsize = sizeof(struct xt_quota_info),
|
|
.me = THIS_MODULE
|
|
},
|
|
};
|
|
|
|
static int __init xt_quota_init(void)
|
|
{
|
|
return xt_register_matches(xt_quota_match, ARRAY_SIZE(xt_quota_match));
|
|
}
|
|
|
|
static void __exit xt_quota_fini(void)
|
|
{
|
|
xt_unregister_matches(xt_quota_match, ARRAY_SIZE(xt_quota_match));
|
|
}
|
|
|
|
module_init(xt_quota_init);
|
|
module_exit(xt_quota_fini);
|