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ovs: allow nl 'flow set' to use ufid without flow key
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When we want to change a flow using netlink, we have to identify it to
be able to perform a lookup. Both the flow key and unique flow ID
(ufid) are valid identifiers, but we always have to specify the flow
key in the netlink message. When both attributes are there, the ufid
is used. The flow key is used to validate the actions provided by
the userland.

This commit allows to use the ufid without having to provide the flow
key, as it is already done in the netlink 'flow get' and 'flow del'
path. The flow key remains mandatory when an action is provided.

Signed-off-by: Samuel Gauthier <samuel.gauthier@6wind.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Samuel Gauthier authored and David S. Miller committed Mar 14, 2016
1 parent 6bdaa5e commit 6f15cdb
Showing 1 changed file with 17 additions and 11 deletions.
28 changes: 17 additions & 11 deletions net/openvswitch/datapath.c
Original file line number Diff line number Diff line change
@@ -1096,26 +1096,32 @@ static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
struct sw_flow_match match;
struct sw_flow_id sfid;
u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
int error;
int error = 0;
bool log = !a[OVS_FLOW_ATTR_PROBE];
bool ufid_present;

/* Extract key. */
error = -EINVAL;
if (!a[OVS_FLOW_ATTR_KEY]) {
OVS_NLERR(log, "Flow key attribute not present in set flow.");
goto error;
}

ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
ovs_match_init(&match, &key, &mask);
error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
a[OVS_FLOW_ATTR_MASK], log);
if (a[OVS_FLOW_ATTR_KEY]) {
ovs_match_init(&match, &key, &mask);
error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
a[OVS_FLOW_ATTR_MASK], log);
} else if (!ufid_present) {
OVS_NLERR(log,
"Flow set message rejected, Key attribute missing.");
error = -EINVAL;
}
if (error)
goto error;

/* Validate actions. */
if (a[OVS_FLOW_ATTR_ACTIONS]) {
if (!a[OVS_FLOW_ATTR_KEY]) {
OVS_NLERR(log,
"Flow key attribute not present in set flow.");
error = -EINVAL;
goto error;
}

acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], &key,
&mask, log);
if (IS_ERR(acts)) {

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