[PATCH nft 02/10] src: ct: store proto base of ct key, if any

[Florian Westphal <fw@strlen.de>]

ct keys can match on network and tranasport header protocol
elements, such as port numbers or ip addresses.

Store this base type so a followup commit can store and kill
dependencies, e.g. if bsae is network header we might be able
to kill an earlier expression because the dependency is implicit.

Signed-off-by: Florian Westphal <fw@strlen.de>
---
 include/expression.h |  1 +
 src/ct.c             | 13 +++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/include/expression.h b/include/expression.h
index 90caaf51c36a..5b34d13d8527 100644
--- a/include/expression.h
+++ b/include/expression.h
@@ -300,6 +300,7 @@ struct expr {
 		struct {
 			/* EXPR_CT */
 			enum nft_ct_keys	key;
+			enum proto_bases	base;
 			int8_t			direction;
 			uint8_t			nfproto;
 		} ct;
diff --git a/src/ct.c b/src/ct.c
index 2b2578732066..99e4430bf173 100644
--- a/src/ct.c
+++ b/src/ct.c
@@ -347,8 +347,21 @@ struct expr *ct_expr_alloc(const struct location *loc, enum nft_ct_keys key,
 	expr->ct.nfproto = nfproto;
 
 	switch (key) {
+	case NFT_CT_SRC:
+	case NFT_CT_DST:
+		expr->ct.base = PROTO_BASE_NETWORK_HDR;
+		break;
+	case NFT_CT_PROTO_SRC:
+	case NFT_CT_PROTO_DST:
+		expr->ct.base = PROTO_BASE_TRANSPORT_HDR;
+		break;
 	case NFT_CT_PROTOCOL:
 		expr->flags = EXPR_F_PROTOCOL;
+		expr->ct.base = PROTO_BASE_NETWORK_HDR;
+		break;
+	case NFT_CT_L3PROTOCOL:
+		expr->flags = EXPR_F_PROTOCOL;
+		expr->ct.base = PROTO_BASE_LL_HDR;
 		break;
 	default:
 		break;
-- 
2.13.5