/* Execute a list of actions against 'skb'. */
int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb)
{
struct sw_flow_actions *acts = rcu_dereference(OVS_CB(skb)->flow->sf_acts);
struct loop_counter *loop;
int error;
struct ovs_key_ipv4_tunnel tun_key;
/* Check whether we've looped too much. */
loop = &__get_cpu_var(loop_counters);
if (unlikely(++loop->count > MAX_LOOPS))
loop->looping = true;
if (unlikely(loop->looping)) {
error = loop_suppress(dp, acts);
kfree_skb(skb);
goto out_loop;
}
OVS_CB(skb)->tun_key = NULL;
error = do_execute_actions(dp, skb, acts->actions,
acts->actions_len, &tun_key, false);
/* Check whether sub-actions looped too much. */
if (unlikely(loop->looping))
error = loop_suppress(dp, acts);
out_loop:
/* Decrement loop counter. */
if (!--loop->count)
loop->looping = false;
return error;
}
/* Execute a list of actions against 'skb'. */
int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb)
{
struct sw_flow_actions *acts = rcu_dereference(OVS_CB(skb)->flow->sf_acts);
return do_execute_actions(dp, skb, acts->actions,
acts->actions_len, false);
}
static int sample(struct datapath *dp, struct sk_buff *skb,
const struct nlattr *attr,
struct ovs_key_ipv4_tunnel *tun_key)
{
const struct nlattr *acts_list = NULL;
const struct nlattr *a;
int rem;
for (a = nla_data(attr), rem = nla_len(attr); rem > 0;
a = nla_next(a, &rem)) {
switch (nla_type(a)) {
case OVS_SAMPLE_ATTR_PROBABILITY:
if (net_random() >= nla_get_u32(a))
return 0;
break;
case OVS_SAMPLE_ATTR_ACTIONS:
acts_list = a;
break;
}
}
return do_execute_actions(dp, skb, nla_data(acts_list),
nla_len(acts_list), tun_key, true);
}
