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@nicira.com>
Acked-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index ffe984f..d5b5473 100644 (file)
--- 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 (file)
--- 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 4e7a3f7..c182b28 100644 (file)
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -1619,6 +1619,7 @@ static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa,
 
        memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
        acts->actions_len = (*sfa)->actions_len;
+       acts->orig_len = (*sfa)->orig_len;
        kfree(*sfa);
        *sfa = acts;
 
@@ -2223,6 +2224,7 @@ int ovs_nla_copy_actions(const struct nlattr *attr,
        if (IS_ERR(*sfa))
                return PTR_ERR(*sfa);
 
+       (*sfa)->orig_len = nla_len(attr);
        err = __ovs_nla_copy_actions(attr, key, 0, sfa, key->eth.type,
                                     key->eth.tci, log);
        if (err)