1 files changed, 93 insertions, 0 deletions
diff --git a/net/netfilter/xt_nfacct.c b/net/netfilter/xt_nfacct.c
new file mode 100644
index 000000000..7c6bf1c16
--- /dev/null
+++ b/net/netfilter/xt_nfacct.c
@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * (C) 2011 Pablo Neira Ayuso <pablo@netfilter.org>
+ * (C) 2011 Intra2net AG <https://www.intra2net.com>
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/nfnetlink_acct.h>
+#include <linux/netfilter/xt_nfacct.h>
+
+MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
+MODULE_DESCRIPTION("Xtables: match for the extended accounting infrastructure");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ipt_nfacct");
+MODULE_ALIAS("ip6t_nfacct");
+
+static bool nfacct_mt(const struct sk_buff *skb, struct xt_action_param *par)
+{
+	int overquota;
+	const struct xt_nfacct_match_info *info = par->targinfo;
+
+	nfnl_acct_update(skb, info->nfacct);
+
+	overquota = nfnl_acct_overquota(xt_net(par), info->nfacct);
+
+	return overquota != NFACCT_UNDERQUOTA;
+}
+
+static int
+nfacct_mt_checkentry(const struct xt_mtchk_param *par)
+{
+	struct xt_nfacct_match_info *info = par->matchinfo;
+	struct nf_acct *nfacct;
+
+	nfacct = nfnl_acct_find_get(par->net, info->name);
+	if (nfacct == NULL) {
+		pr_info_ratelimited("accounting object `%s' does not exists\n",
+				    info->name);
+		return -ENOENT;
+	}
+	info->nfacct = nfacct;
+	return 0;
+}
+
+static void
+nfacct_mt_destroy(const struct xt_mtdtor_param *par)
+{
+	const struct xt_nfacct_match_info *info = par->matchinfo;
+
+	nfnl_acct_put(info->nfacct);
+}
+
+static struct xt_match nfacct_mt_reg[] __read_mostly = {
+	{
+		.name       = "nfacct",
+		.revision   = 0,
+		.family     = NFPROTO_UNSPEC,
+		.checkentry = nfacct_mt_checkentry,
+		.match      = nfacct_mt,
+		.destroy    = nfacct_mt_destroy,
+		.matchsize  = sizeof(struct xt_nfacct_match_info),
+		.usersize   = offsetof(struct xt_nfacct_match_info, nfacct),
+		.me         = THIS_MODULE,
+	},
+	{
+		.name       = "nfacct",
+		.revision   = 1,
+		.family     = NFPROTO_UNSPEC,
+		.checkentry = nfacct_mt_checkentry,
+		.match      = nfacct_mt,
+		.destroy    = nfacct_mt_destroy,
+		.matchsize  = sizeof(struct xt_nfacct_match_info_v1),
+		.usersize   = offsetof(struct xt_nfacct_match_info_v1, nfacct),
+		.me         = THIS_MODULE,
+	},
+};
+
+static int __init nfacct_mt_init(void)
+{
+	return xt_register_matches(nfacct_mt_reg, ARRAY_SIZE(nfacct_mt_reg));
+}
+
+static void __exit nfacct_mt_exit(void)
+{
+	xt_unregister_matches(nfacct_mt_reg, ARRAY_SIZE(nfacct_mt_reg));
+}
+
+module_init(nfacct_mt_init);
+module_exit(nfacct_mt_exit);