https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 568035b01cfb107af8d2e4bd2fb9aea22cf5b868 authored by Linus Torvalds on 14 August 2022, 22:50:18 UTC
Linux 6.0-rc1
Linux 6.0-rc1
Tip revision: 568035b
xt_quota.c
// SPDX-License-Identifier: GPL-2.0-only
/*
* 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;
}
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;
}
static void quota_mt_destroy(const struct xt_mtdtor_param *par)
{
const struct xt_quota_info *q = par->matchinfo;
kfree(q->master);
}
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);
}
static void __exit quota_mt_exit(void)
{
xt_unregister_match("a_mt_reg);
}
module_init(quota_mt_init);
module_exit(quota_mt_exit);