src: add comment support when adding tables

Adds userdata building logic if a comment is specified when creating a
new table. Adds netlink userdata parsing callback function.

Relies on kernel supporting userdata for nft_table.

Example:

> nft add table ip x { comment "test"\; }
> nft list ruleset

table ip x {
	comment "test"
}

Signed-off-by: Jose M. Guisado Gomez <guigom@riseup.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/parser_bison.y b/src/parser_bison.y
index d4e99417..95adc48f 100644
--- a/src/parser_bison.y
+++ b/src/parser_bison.y
@@ -1533,6 +1533,10 @@ table_options		:	FLAGS		STRING
 					YYERROR;
 				}
 			}
+			|	comment_spec
+			{
+				$<table>0->comment = $1;
+			}
 			;
 
 table_block		:	/* empty */	{ $$ = $<table>-1; }