ovs: allow nl 'flow set' to use ufid without flow key (6f15cdbf) · Commits · 戴 / test

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>

net/openvswitch/datapath.c

+17 −11

Original line number	Diff line number	Diff line
		@@ -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);
		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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