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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>
This commit is contained in:
Joe Stringer 2015-08-26 11:31:44 -07:00 committed by David S. Miller
parent 538e456319
commit 8e2fed1c0c
3 changed files with 4 additions and 1 deletions
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2
net/openvswitch/datapath.c
View File

@ -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 */

1
net/openvswitch/flow.h
View File

@ -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[];
};

2
net/openvswitch/flow_netlink.c
View File

@ -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)