[PATCH nft,RFC,PoC 1/2] parser: add typeof keyword for declarations

[Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>]

Add a typeof keyword to automatically use the correct type in set and map
declarations.

table filter {
	set blacklist {
		typeof ip saddr
	}

	chain input {
		ip saddr @blacklist counter drop
	}
}

Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
 src/parser_bison.y | 20 ++++++++++++++++++++
 src/scanner.l      |  1 +
 2 files changed, 21 insertions(+)

diff --git a/src/parser_bison.y b/src/parser_bison.y
index 53e669521efa..5a1a37679a29 100644
--- a/src/parser_bison.y
+++ b/src/parser_bison.y
@@ -206,6 +206,8 @@ int nft_lex(void *, void *, void *);
 %token WSCALE			"wscale"
 %token SACKPERM			"sack-perm"
 
+%token TYPEOF			"typeof"
+
 %token HOOK			"hook"
 %token DEVICE			"device"
 %token DEVICES			"devices"
@@ -1624,6 +1626,12 @@ set_block		:	/* empty */	{ $$ = $<set>-1; }
 				$1->key = $3;
 				$$ = $1;
 			}
+			|	set_block	TYPEOF		primary_expr	stmt_separator
+			{
+				$1->key = $3;
+				datatype_set($1->key, $3->dtype);
+				$$ = $1;
+			}
 			|	set_block	FLAGS		set_flag_list	stmt_separator
 			{
 				$1->flags = $3;
@@ -1694,6 +1702,18 @@ map_block		:	/* empty */	{ $$ = $<set>-1; }
 				$1->flags |= NFT_SET_MAP;
 				$$ = $1;
 			}
+			|	map_block	TYPEOF
+						primary_expr	COLON	primary_expr
+						stmt_separator
+			{
+				$1->key = $3;
+				datatype_set($1->key, $3->dtype);
+				$1->datatype = $5->dtype;
+
+				expr_free($5);
+				$1->flags |= NFT_SET_MAP;
+				$$ = $1;
+			}
 			|	map_block	TYPE
 						data_type_expr	COLON	COUNTER
 						stmt_separator
diff --git a/src/scanner.l b/src/scanner.l
index 4ed5f9241381..6a0f95776b38 100644
--- a/src/scanner.l
+++ b/src/scanner.l
@@ -238,6 +238,7 @@ addrstring	({macaddr}|{ip4addr}|{ip6addr})
 "define"		{ return DEFINE; }
 "redefine"		{ return REDEFINE; }
 "undefine"		{ return UNDEFINE; }
+"typeof"		{ return TYPEOF; }
 
 "describe"		{ return DESCRIBE; }
 
-- 
2.11.0