[ovs-dev] [PATCH] datapath: Backport: openvswitch: Fix serialization of non-masked set actions.

[Pravin B Shelar]

I found this missing commit while checking diff against upstream OVS.

Upstream Commit msg:
    Set actions consist of a regular OVS_KEY_ATTR_* attribute nested inside
    of a OVS_ACTION_ATTR_SET action attribute. When converting masked actions
    back to regular set actions, the inner attribute length was not changed,
    ie, double the length being serialized. This patch fixes the bug.

    Fixes: 83d2b9b ("net: openvswitch: Support masked set actions.")
    Signed-off-by: Joe Stringer <joestringer at nicira.com>
    Acked-by: Jarno Rajahalme <jrajahalme at nicira.com>
    Signed-off-by: David S. Miller <davem at davemloft.net>

Upstream: f4f8e738505 ("openvswitch: Fix serialization of non-masked set
actions")
Signed-off-by: Pravin B Shelar <pshelar at nicira.com>
---
 datapath/flow_netlink.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/datapath/flow_netlink.c b/datapath/flow_netlink.c
index 8df5c69..6ffcc53 100644
--- a/datapath/flow_netlink.c
+++ b/datapath/flow_netlink.c
@@ -2412,14 +2412,20 @@ static int masked_set_action_to_set_action_attr(const struct nlattr *a,
 						struct sk_buff *skb)
 {
 	const struct nlattr *ovs_key = nla_data(a);
+	struct nlattr *nla;
 	size_t key_len = nla_len(ovs_key) / 2;
 
 	/* Revert the conversion we did from a non-masked set action to
 	 * masked set action.
 	 */
-	if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a) - key_len, ovs_key))
+	nla = nla_nest_start(skb, OVS_ACTION_ATTR_SET);
+	if (!nla)
 		return -EMSGSIZE;
 
+	if (nla_put(skb, nla_type(ovs_key), key_len, nla_data(ovs_key)))
+		return -EMSGSIZE;
+
+	nla_nest_end(skb, nla);
 	return 0;
 }
 
-- 
1.8.3.1