[PATCH] cls: add rtnl_u32_get_classid() API

[Cong Wang]

Cc:  Thomas Haller <thaller at redhat.com>
Signed-off-by: Cong Wang <xiyou.wangcong at gmail.com>
---
 include/netlink/route/cls/u32.h |  1 +
 lib/route/cls/u32.c             | 14 ++++++++++++++
 libnl-route-3.sym               |  1 +
 3 files changed, 16 insertions(+)

diff --git a/include/netlink/route/cls/u32.h b/include/netlink/route/cls/u32.h
index 4567e16..151c818 100644
--- a/include/netlink/route/cls/u32.h
+++ b/include/netlink/route/cls/u32.h
@@ -23,6 +23,7 @@ extern "C" {
 
 extern void	rtnl_u32_set_handle(struct rtnl_cls *, int, int, int);
 extern int	rtnl_u32_set_classid(struct rtnl_cls *, uint32_t);
+extern int	rtnl_u32_get_classid(struct rtnl_cls *, uint32_t *);
 extern int	rtnl_u32_set_divisor(struct rtnl_cls *, uint32_t);
 extern int	rtnl_u32_set_link(struct rtnl_cls *, uint32_t);
 extern int	rtnl_u32_set_hashtable(struct rtnl_cls *, uint32_t);
diff --git a/lib/route/cls/u32.c b/lib/route/cls/u32.c
index 1912533..2e8eee4 100644
--- a/lib/route/cls/u32.c
+++ b/lib/route/cls/u32.c
@@ -415,6 +415,20 @@ int rtnl_u32_set_classid(struct rtnl_cls *cls, uint32_t classid)
 	return 0;
 }
 
+int rtnl_u32_get_classid(struct rtnl_cls *cls, uint32_t *classid)
+{
+	struct rtnl_u32 *u;
+
+	if (!(u = rtnl_tc_data(TC_CAST(cls))))
+		return -NLE_NOMEM;
+
+	if (!(u->cu_mask & U32_ATTR_CLASSID))
+		return -NLE_INVAL;
+
+	*classid = u->cu_classid;
+	return 0;
+}
+
 int rtnl_u32_set_divisor(struct rtnl_cls *cls, uint32_t divisor)
 {
 	struct rtnl_u32 *u;
diff --git a/libnl-route-3.sym b/libnl-route-3.sym
index 2768f05..7a5f26f 100644
--- a/libnl-route-3.sym
+++ b/libnl-route-3.sym
@@ -815,6 +815,7 @@ global:
 	rtnl_u32_del_action;
 	rtnl_u32_get_key;
 	rtnl_u32_set_classid;
+	rtnl_u32_get_classid;
 	rtnl_u32_set_cls_terminal;
 	rtnl_u32_set_divisor;
 	rtnl_u32_set_flags;
-- 
1.8.1.4