Implement OpenFlow hard timeouts.

[sliver-openvswitch.git] / datapath / flow.c

diff --git a/datapath/flow.c b/datapath/flow.c
index 094d32b..9b5a87a 100644 (file)
--- a/datapath/flow.c
+++ b/datapath/flow.c
@@ -11,6 +11,7 @@
 #include <linux/if_vlan.h>
 #include <net/llc_pdu.h>
 #include <linux/ip.h>
+#include <linux/jiffies.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/tcp.h>
@@ -126,6 +127,20 @@ void flow_fill_match(struct ofp_match* to, const struct sw_flow_key* from)
        memset(to->pad, '\0', sizeof(to->pad));
 }
 
+int flow_timeout(struct sw_flow *flow)
+{
+       if (flow->idle_timeout != OFP_FLOW_PERMANENT
+           && time_after(jiffies, flow->used + flow->idle_timeout * HZ))
+               return OFPER_IDLE_TIMEOUT;
+       else if (flow->hard_timeout != OFP_FLOW_PERMANENT
+                && time_after(jiffies,
+                              flow->init_time + flow->hard_timeout * HZ))
+               return OFPER_HARD_TIMEOUT;
+       else
+               return -1;
+}
+EXPORT_SYMBOL(flow_timeout);
+
 /* Allocates and returns a new flow with 'n_actions' action, using allocation
  * flags 'flags'.  Returns the new flow or a null pointer on failure. */
 struct sw_flow *flow_alloc(int n_actions, gfp_t flags)