netfilter: nf_tables: add new nft_masq expression

The nft_masq expression is intended to perform NAT in the masquerade flavour.

We decided to have the masquerade functionality in a separated expression other
than nft_nat.

Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/include/uapi/linux/netfilter/nf_tables.h b/include/uapi/linux/netfilter/nf_tables.h
index 6022c6e6be18..eeec0ae845ef 100644
--- a/include/uapi/linux/netfilter/nf_tables.h
+++ b/include/uapi/linux/netfilter/nf_tables.h
@@ -800,4 +800,15 @@ enum nft_nat_attributes {
 };
 #define NFTA_NAT_MAX            (__NFTA_NAT_MAX - 1)
 
+/**
+ * enum nft_masq_attributes - nf_tables masquerade expression attributes
+ *
+ * @NFTA_MASQ_FLAGS: NAT flags (see NF_NAT_RANGE_* in linux/netfilter/nf_nat.h) (NLA_U32)
+ */
+enum nft_masq_attributes {
+        NFTA_MASQ_FLAGS,
+        __NFTA_MASQ_MAX
+};
+#define NFTA_MASQ_MAX           (__NFTA_MASQ_MAX - 1)
+
 #endif /* _LINUX_NF_TABLES_H */