linux-kernel - [PATCH 5.16 191/285] net: openvswitch: dont send internal clone attribute to the userspace.

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Date:   Tue, 12 Apr 2022 08:30:48 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ilya Maximets <i.maximets@....org>,
        Aaron Conole <aconole@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.16 191/285] net: openvswitch: dont send internal clone attribute to the userspace.

From: Ilya Maximets <i.maximets@....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@...-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@....org>
Acked-by: Aaron Conole <aconole@...hat.com>
Link: https://lore.kernel.org/r/20220404104150.2865736-1-i.maximets@ovn.org
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.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 780d9e2246f3..8955f31fa47e 100644
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -1051,7 +1051,7 @@ 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 0d677c9c2c80..2679007f8aeb 100644
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -3429,7 +3429,9 @@ 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);
-- 
2.35.1