expression: print sets and maps in pretty format

Print elements per line instead of all in a single line.
The elements which can be 'short' are printed 5 per line,
and others, like IPv4 addresses are printed 2 per line.

Example:

% nft list ruleset -nnn
table ip t {
	set s {
		type inet_service
		elements = { 1, 2, 3, 4, 10,
			     432, 433, 434, 435, 436,
			     437, 438, 439, 440, 441,
			     442, 443, 444, 445, 446,
			     447, 448, 449, 450, 12345 }
	}

	map m {
		type inet_service . iface_index : verdict
		elements = { 123 . "lo" : accept,
			     1234 . "lo" : accept,
			     12345 . "lo" : accept,
			     12346 . "lo" : accept,
			     12347 . "lo" : accept }
	}

	set s3 {
		type ipv4_addr
		elements = { 1.1.1.1, 2.2.2.2,
			     3.3.3.3 }
	}
}

Signed-off-by: Arturo Borrero Gonzalez <arturo@debian.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/netlink.c b/src/netlink.c
index 6fbb67da..59e8918d 100644
--- a/src/netlink.c
+++ b/src/netlink.c
@@ -1730,6 +1730,8 @@ int netlink_get_setelems(struct netlink_ctx *ctx, const struct handle *h,
 	ctx->set = set;
 	set->init = set_expr_alloc(loc);
 	nftnl_set_elem_foreach(nls, list_setelem_cb, ctx);
+	set->init->set_flags = set->flags;
+	set->init->dtype = set->keytype;
 
 	if (!(set->flags & NFT_SET_INTERVAL))
 		list_expr_sort(&ctx->set->init->expressions);