commit 6b2672f3c9493aef3495192e113f95a7db4b65bc
author Timo Teräs <timo.teras@iki.fi> Wed Apr 29 09:43:03 2015 +0300
committer David Lamparter <equinox@opensourcerouting.org> Wed May 20 18:50:56 2015 +0200
tree 6cd9affdd144ed6a714a93b16f6c888a21616f8b
parent 38f22ab07c8e1f0f12e23c2e2d0a3e1f71bef695

sockopt: add support for querying tcp round-trip-time

Signed-off-by: Timo Teräs <timo.teras@iki.fi>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>

lib/sockopt.c

diff --git a/lib/sockopt.c b/lib/sockopt.c
index be22827..257271b 100644
--- a/lib/sockopt.c
+++ b/lib/sockopt.c
@@ -519,6 +519,22 @@
 }
 
 int
+sockopt_tcp_rtt (int sock)
+{
+#ifdef TCP_INFO
+  struct tcp_info ti;
+  socklen_t len = sizeof(ti);
+
+  if (getsockopt (sock, IPPROTO_TCP, TCP_INFO, &ti, &len) != 0)
+    return 0;
+
+  return ti.tcpi_rtt / 1000;
+#else
+  return 0;
+#endif
+}
+
+int
 sockopt_tcp_signature (int sock, union sockunion *su, const char *password)
 {
 #if defined(HAVE_TCP_MD5_LINUX24) && defined(GNU_LINUX)

lib/sockopt.h

diff --git a/lib/sockopt.h b/lib/sockopt.h
index aced6d4..cb14efc 100644
--- a/lib/sockopt.h
+++ b/lib/sockopt.h
@@ -100,6 +100,7 @@
 extern void sockopt_iphdrincl_swab_htosys (struct ip *iph);
 extern void sockopt_iphdrincl_swab_systoh (struct ip *iph);
 
+extern int sockopt_tcp_rtt (int);
 extern int sockopt_tcp_signature(int sock, union sockunion *su,
                                  const char *password);
 #endif /*_ZEBRA_SOCKOPT_H */