1 files changed, 102 insertions, 0 deletions
diff --git a/net/netfilter/xt_connlabel.c b/net/netfilter/xt_connlabel.c
new file mode 100644
index 000000000..87505cdad
--- /dev/null
+++ b/net/netfilter/xt_connlabel.c
@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * (C) 2013 Astaro GmbH & Co KG
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_ecache.h>
+#include <net/netfilter/nf_conntrack_labels.h>
+#include <linux/netfilter/x_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
+MODULE_DESCRIPTION("Xtables: add/match connection tracking labels");
+MODULE_ALIAS("ipt_connlabel");
+MODULE_ALIAS("ip6t_connlabel");
+
+static bool
+connlabel_mt(const struct sk_buff *skb, struct xt_action_param *par)
+{
+	const struct xt_connlabel_mtinfo *info = par->matchinfo;
+	enum ip_conntrack_info ctinfo;
+	struct nf_conn_labels *labels;
+	struct nf_conn *ct;
+	bool invert = info->options & XT_CONNLABEL_OP_INVERT;
+
+	ct = nf_ct_get(skb, &ctinfo);
+	if (ct == NULL)
+		return invert;
+
+	labels = nf_ct_labels_find(ct);
+	if (!labels)
+		return invert;
+
+	if (test_bit(info->bit, labels->bits))
+		return !invert;
+
+	if (info->options & XT_CONNLABEL_OP_SET) {
+		if (!test_and_set_bit(info->bit, labels->bits))
+			nf_conntrack_event_cache(IPCT_LABEL, ct);
+
+		return !invert;
+	}
+
+	return invert;
+}
+
+static int connlabel_mt_check(const struct xt_mtchk_param *par)
+{
+	const int options = XT_CONNLABEL_OP_INVERT |
+			    XT_CONNLABEL_OP_SET;
+	struct xt_connlabel_mtinfo *info = par->matchinfo;
+	int ret;
+
+	if (info->options & ~options) {
+		pr_info_ratelimited("Unknown options in mask %x\n",
+				    info->options);
+		return -EINVAL;
+	}
+
+	ret = nf_ct_netns_get(par->net, par->family);
+	if (ret < 0) {
+		pr_info_ratelimited("cannot load conntrack support for proto=%u\n",
+				    par->family);
+		return ret;
+	}
+
+	ret = nf_connlabels_get(par->net, info->bit);
+	if (ret < 0)
+		nf_ct_netns_put(par->net, par->family);
+	return ret;
+}
+
+static void connlabel_mt_destroy(const struct xt_mtdtor_param *par)
+{
+	nf_connlabels_put(par->net);
+	nf_ct_netns_put(par->net, par->family);
+}
+
+static struct xt_match connlabels_mt_reg __read_mostly = {
+	.name           = "connlabel",
+	.family         = NFPROTO_UNSPEC,
+	.checkentry     = connlabel_mt_check,
+	.match          = connlabel_mt,
+	.matchsize      = sizeof(struct xt_connlabel_mtinfo),
+	.destroy        = connlabel_mt_destroy,
+	.me             = THIS_MODULE,
+};
+
+static int __init connlabel_mt_init(void)
+{
+	return xt_register_match(&connlabels_mt_reg);
+}
+
+static void __exit connlabel_mt_exit(void)
+{
+	xt_unregister_match(&connlabels_mt_reg);
+}
+
+module_init(connlabel_mt_init);
+module_exit(connlabel_mt_exit);