mnl: do not build nftnl_set element list

Do not call alloc_setelem_cache() to build the set element list in
nftnl_set. Instead, translate one single set element expression to
nftnl_set_elem object at a time and use this object to build the netlink
header.

Using a huge test set containing 1.1 million element blocklist, this
patch is reducing userspace memory consumption by 40%.

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

1 files changed, 2 insertions, 2 deletions

diff --git a/src/netlink.c b/src/netlink.c
index 28a5514a..f63f2bd1 100644
--- a/src/netlink.c
+++ b/src/netlink.c
@@ -100,8 +100,8 @@ struct nftnl_expr *alloc_nft_expr(const char *name)
 void __netlink_gen_data(const struct expr *expr,
 			struct nft_data_linearize *data, bool expand);
 
-static struct nftnl_set_elem *alloc_nftnl_setelem(const struct expr *set,
-						  const struct expr *expr)
+struct nftnl_set_elem *alloc_nftnl_setelem(const struct expr *set,
+					   const struct expr *expr)
 {
 	const struct expr *elem, *data;
 	struct nftnl_set_elem *nlse;