netfilter: xt_CT: add alias flag

This patch adds the alias flag to support full NOTRACK target
aliasing.

Based on initial patch from Jozsef Kadlecsik.

Acked-by: Jozsef Kadlecsik <[e-mail]>
Signed-off-by: Pablo Neira Ayuso <[e-mail]>

include/uapi/linux/netfilter/xt_CT.h

···
 
 #include <linux/types.h>
 
-#define XT_CT_NOTRACK	0x1
+enum {
+	XT_CT_NOTRACK		= 1 << 0,
+	XT_CT_NOTRACK_ALIAS	= 1 << 1,
+	XT_CT_MASK		= XT_CT_NOTRACK | XT_CT_NOTRACK_ALIAS,
+};
 
 struct xt_ct_target_info {
 	__u16 flags;

net/netfilter/xt_CT.c

···
 	struct nf_conn *ct;
 	int ret = -EOPNOTSUPP;
 
-	if (info->flags & ~XT_CT_NOTRACK)
-		return -EINVAL;
-
 	if (info->flags & XT_CT_NOTRACK) {
 		ct = nf_ct_untracked_get();
 		atomic_inc(&ct->ct_general.use);
···
 	};
 	int ret;
 
+	if (info->flags & ~XT_CT_NOTRACK)
+		return -EINVAL;
+
 	memcpy(info_v1.helper, info->helper, sizeof(info->helper));
 
 	ret = xt_ct_tg_check(par, &info_v1);
···
 
 static int xt_ct_tg_check_v1(const struct xt_tgchk_param *par)
 {
+	struct xt_ct_target_info_v1 *info = par->targinfo;
+
+	if (info->flags & ~XT_CT_NOTRACK)
+		return -EINVAL;
+
+	return xt_ct_tg_check(par, par->targinfo);
+}
+
+static int xt_ct_tg_check_v2(const struct xt_tgchk_param *par)
+{
+	struct xt_ct_target_info_v1 *info = par->targinfo;
+
+	if (info->flags & ~XT_CT_MASK)
+		return -EINVAL;
+
 	return xt_ct_tg_check(par, par->targinfo);
 }
 
···
 		.revision	= 1,
 		.targetsize	= sizeof(struct xt_ct_target_info_v1),
 		.checkentry	= xt_ct_tg_check_v1,
+		.destroy	= xt_ct_tg_destroy_v1,
+		.target		= xt_ct_target_v1,
+		.table		= "raw",
+		.me		= THIS_MODULE,
+	},
+	{
+		.name		= "CT",
+		.family		= NFPROTO_UNSPEC,
+		.revision	= 2,
+		.targetsize	= sizeof(struct xt_ct_target_info_v1),
+		.checkentry	= xt_ct_tg_check_v2,
 		.destroy	= xt_ct_tg_destroy_v1,
 		.target		= xt_ct_target_v1,
 		.table		= "raw",