From: Ilya Maximets i.maximets@ovn.org
[ Upstream commit 3f2a3050b4a3e7f32fc0ea3c9b0183090ae00522 ]
'OVS_CLONE_ATTR_EXEC' is an internal attribute that is used for performance optimization inside the kernel. It's added by the kernel while parsing user-provided actions and should not be sent during the flow dump as it's not part of the uAPI.
The issue doesn't cause any significant problems to the ovs-vswitchd process, because reported actions are not really used in the application lifecycle and only supposed to be shown to a human via ovs-dpctl flow dump. However, the action list is still incorrect and causes the following error if the user wants to look at the datapath flows:
# ovs-dpctl add-dp system@ovs-system # ovs-dpctl add-flow "<flow match>" "clone(ct(commit),0)" # ovs-dpctl dump-flows <flow match>, packets:0, bytes:0, used:never, actions:clone(bad length 4, expected -1 for: action0(01 00 00 00), ct(commit),0)
With the fix:
# ovs-dpctl dump-flows <flow match>, packets:0, bytes:0, used:never, actions:clone(ct(commit),0)
Additionally fixed an incorrect attribute name in the comment.
Fixes: b233504033db ("openvswitch: kernel datapath clone action") Signed-off-by: Ilya Maximets i.maximets@ovn.org Acked-by: Aaron Conole aconole@redhat.com Link: https://lore.kernel.org/r/20220404104150.2865736-1-i.maximets@ovn.org Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- net/openvswitch/actions.c | 2 +- net/openvswitch/flow_netlink.c | 4 +++- 2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c index 100cc09c100d..8b75afe41284 100644 --- a/net/openvswitch/actions.c +++ b/net/openvswitch/actions.c @@ -1098,7 +1098,7 @@ static int clone(struct datapath *dp, struct sk_buff *skb, int rem = nla_len(attr); bool dont_clone_flow_key;
- /* The first action is always 'OVS_CLONE_ATTR_ARG'. */ + /* The first action is always 'OVS_CLONE_ATTR_EXEC'. */ clone_arg = nla_data(attr); dont_clone_flow_key = nla_get_u32(clone_arg); actions = nla_next(clone_arg, &rem); diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c index fb69978f50ec..4413ffdc1e03 100644 --- a/net/openvswitch/flow_netlink.c +++ b/net/openvswitch/flow_netlink.c @@ -3173,7 +3173,9 @@ static int clone_action_to_attr(const struct nlattr *attr, if (!start) return -EMSGSIZE;
- err = ovs_nla_put_actions(nla_data(attr), rem, skb); + /* Skipping the OVS_CLONE_ATTR_EXEC that is always the first attribute. */ + attr = nla_next(nla_data(attr), &rem); + err = ovs_nla_put_actions(attr, rem, skb);
if (err) nla_nest_cancel(skb, start);