src: add NFTNL_EXPR_DYNSET_EXPRESSIONS

NFTNL_EXPR_DYNSET_EXPR defines the stateful expression type that
an element stores when added from the packet path.

This patch adds support for the set expression list, which generalizes
NFTNL_EXPR_DYNSET_EXPR.

This patch also adds nftnl_expr_add_expr() to add new expressions to
elements and nftnl_set_expr_expr_foreach() to iterate over the list of
expressions.

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

1 files changed, 3 insertions, 0 deletions

diff --git a/src/expr.c b/src/expr.c
index ed2f60e..8e0bce2 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -42,6 +42,9 @@ struct nftnl_expr *nftnl_expr_alloc(const char *name)
 	expr->flags |= (1 << NFTNL_EXPR_NAME);
 	expr->ops = ops;
 
+	if (ops->init)
+		ops->init(expr);
+
 	return expr;
 }