[RFCv2 net-next 1/7] openvswitch: Serialize acts with original netlink len

From: Joe Stringer
Date: Mon Mar 02 2015 - 17:03:55 EST


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@xxxxxxxxxx>
---
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 ae5e77c..c8c60c5 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -700,7 +700,7 @@ 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 a076e44..998401a 100644
--- a/net/openvswitch/flow.h
+++ b/net/openvswitch/flow.h
@@ -209,6 +209,7 @@ 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 216f20b..d5b01af 100644
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -1543,6 +1543,7 @@ 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;
}

--
1.7.10.4

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