linux-kernel - [PATCH net-next 2/9] openvswitch: Serialize acts with original netlink len

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Message-Id: <1438279963-29563-3-git-send-email-joestringer@nicira.com>
Date:	Thu, 30 Jul 2015 11:12:36 -0700
From:	Joe Stringer <joestringer@...ira.com>
To:	netdev@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, pablo@...filter.org, kaber@...sh.net,
	jpettit@...ira.com, pshelar@...ira.com, azhou@...ira.com,
	jesse@...ira.com, fwestpha@...hat.com, hannes@...hat.com,
	tgraf@...ronetworks.com
Subject: [PATCH net-next 2/9] openvswitch: Serialize acts with original netlink len

Previously, we used the kernel-internal netlink actions length to
calculate the size of messages to serialize back to userspace.
However,the sw_flow_actions may not be formatted exactly the same as the
actions on the wire, so store the original actions length when
de-serializing and re-use the original length when serializing.

Signed-off-by: Joe Stringer <joestringer@...ira.com>
---
 net/openvswitch/datapath.c     | 2 +-
 net/openvswitch/flow.h         | 1 +
 net/openvswitch/flow_netlink.c | 1 +
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index ffe984f..d5b5473 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -713,7 +713,7 @@ static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
 
 	/* OVS_FLOW_ATTR_ACTIONS */
 	if (should_fill_actions(ufid_flags))
-		len += nla_total_size(acts->actions_len);
+		len += nla_total_size(acts->orig_len);
 
 	return len
 		+ nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
diff --git a/net/openvswitch/flow.h b/net/openvswitch/flow.h
index b62cdb3..082a87b 100644
--- a/net/openvswitch/flow.h
+++ b/net/openvswitch/flow.h
@@ -144,6 +144,7 @@ struct sw_flow_id {
 
 struct sw_flow_actions {
 	struct rcu_head rcu;
+	size_t orig_len;	/* From flow_cmd_new netlink actions size */
 	u32 actions_len;
 	struct nlattr actions[];
 };
diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
index a6eb77a..d536fb7 100644
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -1545,6 +1545,7 @@ static struct sw_flow_actions *nla_alloc_flow_actions(int size, bool log)
 		return ERR_PTR(-ENOMEM);
 
 	sfa->actions_len = 0;
+	sfa->orig_len = size;
 	return sfa;
 }
 
-- 
2.1.4

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