tcp: Abstract back handling peer aliveness test into helper function.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 64568fa..e9312a8 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1405,7 +1405,7 @@
(sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) <
(sysctl_max_syn_backlog >> 2)) &&
(!peer || !peer->tcp_ts_stamp) &&
- (!dst || !dst_metric(dst, RTAX_RTT))) {
+ !tcp_peer_is_proven(req, dst)) {
/* Without syncookies last quarter of
* backlog is filled with destinations,
* proven to be alive.
diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c
index 2793ecf..9afe703 100644
--- 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 @@
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);