openvswitch2.13.0
openvswitch/datapath/datapath.c文件（L967行）中：
/* Validate actions. */
error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
&new_flow->key, &acts, log);
if (error) {
OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
goto err_kfree_flow;
}
在openvswitch/datapath/flow_netlink.c文件（L3247）中有ovs_nla_copy_actions函数的实现：
/* 'key' must be the masked key. */
int ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
const struct sw_flow_key *key,
struct sw_flow_actions **sfa, bool log)
{
int err;
u32 mpls_label_count = 0;
*sfa = nla_alloc_flow_actions(min(nla_len(attr), MAX_ACTIONS_BUFSIZE));
if (IS_ERR(*sfa))
return PTR_ERR(*sfa);
if (eth_p_mpls(key->eth.type))
mpls_label_count = hweight_long(key->mpls.num_labels_mask);
(*sfa)->orig_len = nla_len(attr);
err = __ovs_nla_copy_actions(net, attr, key, sfa, key->eth.type,
key->eth.vlan.tci, mpls_label_count, log);
if (err)
ovs_nla_free_flow_actions(*sfa);
return err;
}
在openvswitch/datapath/linux/compat/include/linux/openvswitch.h文件(L993)中有action的定义：
enum ovs_action_attr {
OVS_ACTION_ATTR_UNSPEC,
OVS_ACTION_ATTR_OUTPUT, /* u32 port number. */
OVS_ACTION_ATTR_USERSPACE, /* Nested OVS_USERSPACE_ATTR_*. */
OVS_ACTION_ATTR_SET, /* One nested OVS_KEY_ATTR_*. */
OVS_ACTION_ATTR_PUSH_VLAN, /* struct ovs_action_push_vlan. */
OVS_ACTION_ATTR_POP_VLAN, /* No argument. */
OVS_ACTION_ATTR_SAMPLE, /* Nested OVS_SAMPLE_ATTR_*. */
OVS_ACTION_ATTR_RECIRC, /* u32 recirc_id. */
OVS_ACTION_ATTR_HASH, /* struct ovs_action_hash. */
OVS_ACTION_ATTR_PUSH_MPLS, /* struct ovs_action_push_mpls. */
OVS_ACTION_ATTR_POP_MPLS, /* __be16 ethertype. */
OVS_ACTION_ATTR_SET_MASKED, /* One nested OVS_KEY_ATTR_* including
* data immediately followed by a mask.
* The data must be zero for the unmasked
* bits. */
OVS_ACTION_ATTR_CT, /* Nested OVS_CT_ATTR_* . */
OVS_ACTION_ATTR_TRUNC, /* u32 struct ovs_action_trunc. */
OVS_ACTION_ATTR_PUSH_ETH, /* struct ovs_action_push_eth. */
OVS_ACTION_ATTR_POP_ETH, /* No argument. */
OVS_ACTION_ATTR_CT_CLEAR, /* No argument. */
OVS_ACTION_ATTR_PUSH_NSH, /* Nested OVS_NSH_KEY_ATTR_*. */
OVS_ACTION_ATTR_POP_NSH, /* No argument. */
OVS_ACTION_ATTR_METER, /* u32 meter number. */
OVS_ACTION_ATTR_CLONE, /* Nested OVS_CLONE_ATTR_*. */
OVS_ACTION_ATTR_CHECK_PKT_LEN, /* Nested OVS_CHECK_PKT_LEN_ATTR_*. */
#ifndef __KERNEL__
OVS_ACTION_ATTR_TUNNEL_PUSH, /* struct ovs_action_push_tnl*/
OVS_ACTION_ATTR_TUNNEL_POP, /* u32 port number. */
OVS_ACTION_ATTR_DROP, /* u32 xlate_error. */
#endif
__OVS_ACTION_ATTR_MAX, /* Nothing past this will be accepted
* from userspace. */
#ifdef __KERNEL__
OVS_ACTION_ATTR_SET_TO_MASKED, /* Kernel module internal masked
* set action converted from
* OVS_ACTION_ATTR_SET. */
#endif
};
