[iptables PATCH v3 11/12] nft: Support parsing lookup expression

[Phil Sutter <phil@nwl.cc>]

Add required glue code to support family specific lookup expression
parsers implemented as family_ops callback.

Signed-off-by: Phil Sutter <phil@nwl.cc>
---
Changes since v2:
- Remove call to add_nft_among() which is implemented in next patch to
  not temporarily break builds.
---
 iptables/nft-shared.c | 9 +++++++++
 iptables/nft-shared.h | 2 ++
 iptables/nft.c        | 3 ++-
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/iptables/nft-shared.c b/iptables/nft-shared.c
index 19630c1e2990c..78e422781723f 100644
--- a/iptables/nft-shared.c
+++ b/iptables/nft-shared.c
@@ -588,6 +588,13 @@ static void nft_parse_limit(struct nft_xt_ctx *ctx, struct nftnl_expr *e)
 		ctx->h->ops->parse_match(match, ctx->cs);
 }
 
+static void nft_parse_lookup(struct nft_xt_ctx *ctx, struct nft_handle *h,
+			     struct nftnl_expr *e)
+{
+	if (ctx->h->ops->parse_lookup)
+		ctx->h->ops->parse_lookup(ctx, e, NULL);
+}
+
 void nft_rule_to_iptables_command_state(struct nft_handle *h,
 					const struct nftnl_rule *r,
 					struct iptables_command_state *cs)
@@ -628,6 +635,8 @@ void nft_rule_to_iptables_command_state(struct nft_handle *h,
 			nft_parse_target(&ctx, expr);
 		else if (strcmp(name, "limit") == 0)
 			nft_parse_limit(&ctx, expr);
+		else if (strcmp(name, "lookup") == 0)
+			nft_parse_lookup(&ctx, h, expr);
 
 		expr = nftnl_expr_iter_next(iter);
 	}
diff --git a/iptables/nft-shared.h b/iptables/nft-shared.h
index 0519749f43cd8..b83d148a14dc2 100644
--- a/iptables/nft-shared.h
+++ b/iptables/nft-shared.h
@@ -86,6 +86,8 @@ struct nft_family_ops {
 			      void *data);
 	void (*parse_cmp)(struct nft_xt_ctx *ctx, struct nftnl_expr *e,
 			  void *data);
+	void (*parse_lookup)(struct nft_xt_ctx *ctx, struct nftnl_expr *e,
+			     void *data);
 	void (*parse_immediate)(const char *jumpto, bool nft_goto, void *data);
 
 	void (*print_table_header)(const char *tablename);
diff --git a/iptables/nft.c b/iptables/nft.c
index fbb3e2f2a0f4a..111d4982b1181 100644
--- a/iptables/nft.c
+++ b/iptables/nft.c
@@ -3073,7 +3073,8 @@ static const char *supported_exprs[] = {
 	"cmp",
 	"bitwise",
 	"counter",
-	"immediate"
+	"immediate",
+	"lookup",
 };
 
 
-- 
2.23.0