tcp: Abstract back handling peer aliveness test into helper function.

[firefly-linux-kernel-4.4.55.git] / net / ipv4 / tcp_metrics.c

diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c
index 2793ecf928d346725859df1a606658102fb8a03a..9afe703c85cc2f034f9d0f66a57690d88557ef7c 100644 (file)
--- a/net/ipv4/tcp_metrics.c
+++ b/net/ipv4/tcp_metrics.c
@@ -1,7 +1,9 @@
+#include <linux/module.h>
 #include <linux/cache.h>
 #include <linux/tcp.h>
 
 #include <net/inet_connection_sock.h>
+#include <net/request_sock.h>
 #include <net/sock.h>
 #include <net/dst.h>
 #include <net/tcp.h>
@@ -190,3 +192,11 @@ reset:
                tp->snd_cwnd = tcp_init_cwnd(tp, dst);
        tp->snd_cwnd_stamp = tcp_time_stamp;
 }
+
+bool tcp_peer_is_proven(struct request_sock *req, struct dst_entry *dst)
+{
+       if (!dst)
+               return false;
+       return dst_metric(dst, RTAX_RTT) ? true : false;
+}
+EXPORT_SYMBOL_GPL(tcp_peer_is_proven);