parser_bison: update flow table syntax

Before we release next nft version, update the syntax to wrap the flow
table definition between brackets, eg.

 # nft add rule filter input tcp dport 22 ct state new \
	flow table ssh { ip saddr limit rate 10/second }

 # nft add rule filter input \
        flow table acct { iif . ip saddr timeout 60s counter }

When playing around with this in your initial patchset I found very
confusing that it may not look obvious to users that they can only use
one single statement.

For example:

 # nft add rule filter input \
        flow table acct iif . ip saddr timeout 60s counter limit rate 10/second
                                                           ~~~~~~~~~~~~~~~~~~~~

Note that this limit rate applies globally, so this patch resolves this
ambiguity.

This may cause us problems in the future too if we extend this to
support more than one single statement per flowtable entry (Not
telling we need this now, but if someone comes up with a useful
usecase, we should be capable of extending this).

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/statement.c b/src/statement.c
index 988cfeb7..76f528b3 100644
--- a/src/statement.c
+++ b/src/statement.c
@@ -112,9 +112,11 @@ static void flow_stmt_print(const struct stmt *stmt)
 		expr_print(stmt->flow.set);
 		printf(" ");
 	}
+	printf("{ ");
 	expr_print(stmt->flow.key);
 	printf(" ");
 	stmt_print(stmt->flow.stmt);
+	printf("} ");
 }
 
 static void flow_stmt_destroy(struct stmt *stmt)