src: add "typeof" build/parse/print support

This patch adds two new expression operations to build and to parse the
userdata area that describe the set key and data typeof definitions.

For maps, the grammar enforces either

"type data_type : data_type" or or "typeof expression : expression".

Check both key and data for valid user typeof info first.
If they check out, flag set->key_typeof_valid as true and use it for
printing the key info.

This patch comes with initial support for using payload expressions
with the 'typeof' keyword, followup patches will add support for other
expressions as well.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Florian Westphal <fw@strlen.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/rule.h b/include/rule.h
index ce1f40db..6301fe35 100644
--- a/include/rule.h
+++ b/include/rule.h
@@ -307,6 +307,7 @@ struct set {
 	uint32_t		policy;
 	bool			root;
 	bool			automerge;
+	bool			key_typeof_valid;
 	struct {
 		uint32_t	size;
 	} desc;