Release 4.11 net/netfilter/xt_quota.c
/*
* netfilter module to enforce network quotas
*
* Sam Johnston <samj@samj.net>
*/
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_quota.h>
#include <linux/module.h>
struct xt_quota_priv {
spinlock_t lock;
uint64_t quota;
};
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Sam Johnston <samj@samj.net>");
MODULE_DESCRIPTION("Xtables: countdown quota match");
MODULE_ALIAS("ipt_quota");
MODULE_ALIAS("ip6t_quota");
static bool
quota_mt(const struct sk_buff *skb, struct xt_action_param *par)
{
struct xt_quota_info *q = (void *)par->matchinfo;
struct xt_quota_priv *priv = q->master;
bool ret = q->flags & XT_QUOTA_INVERT;
spin_lock_bh(&priv->lock);
if (priv->quota >= skb->len) {
priv->quota -= skb->len;
ret = !ret;
} else {
/* we do not allow even small packets from now on */
priv->quota = 0;
}
spin_unlock_bh(&priv->lock);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Patrick McHardy | 75 | 73.53% | 1 | 14.29% |
| Jan Engelhardt | 21 | 20.59% | 5 | 71.43% |
| Changli Gao | 6 | 5.88% | 1 | 14.29% |
| Total | 102 | 100.00% | 7 | 100.00% |
static int quota_mt_check(const struct xt_mtchk_param *par)
{
struct xt_quota_info *q = par->matchinfo;
if (q->flags & ~XT_QUOTA_MASK)
return -EINVAL;
q->master = kmalloc(sizeof(*q->master), GFP_KERNEL);
if (q->master == NULL)
return -ENOMEM;
spin_lock_init(&q->master->lock);
q->master->quota = q->quota;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jan Engelhardt | 42 | 48.84% | 7 | 77.78% |
| Patrick McHardy | 34 | 39.53% | 1 | 11.11% |
| Changli Gao | 10 | 11.63% | 1 | 11.11% |
| Total | 86 | 100.00% | 9 | 100.00% |
static void quota_mt_destroy(const struct xt_mtdtor_param *par)
{
const struct xt_quota_info *q = par->matchinfo;
kfree(q->master);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jan Engelhardt | 29 | 100.00% | 1 | 100.00% |
| Total | 29 | 100.00% | 1 | 100.00% |
static struct xt_match quota_mt_reg __read_mostly = {
.name = "quota",
.revision = 0,
.family = NFPROTO_UNSPEC,
.match = quota_mt,
.checkentry = quota_mt_check,
.destroy = quota_mt_destroy,
.matchsize = sizeof(struct xt_quota_info),
.usersize = offsetof(struct xt_quota_info, master),
.me = THIS_MODULE,
};
static int __init quota_mt_init(void)
{
return xt_register_match("a_mt_reg);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Patrick McHardy | 12 | 75.00% | 2 | 50.00% |
| Jan Engelhardt | 4 | 25.00% | 2 | 50.00% |
| Total | 16 | 100.00% | 4 | 100.00% |
static void __exit quota_mt_exit(void)
{
xt_unregister_match("a_mt_reg);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Patrick McHardy | 11 | 73.33% | 2 | 50.00% |
| Jan Engelhardt | 4 | 26.67% | 2 | 50.00% |
| Total | 15 | 100.00% | 4 | 100.00% |
module_init(quota_mt_init);
module_exit(quota_mt_exit);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Patrick McHardy | 213 | 56.65% | 4 | 20.00% |
| Jan Engelhardt | 127 | 33.78% | 12 | 60.00% |
| Changli Gao | 19 | 5.05% | 1 | 5.00% |
| Willem de Bruijn | 11 | 2.93% | 1 | 5.00% |
| Tejun Heo | 3 | 0.80% | 1 | 5.00% |
| Paul Gortmaker | 3 | 0.80% | 1 | 5.00% |
| Total | 376 | 100.00% | 20 | 100.00% |
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