From: Timo Teräs <timo.teras@iki.fi>
Date: Wed, 29 Apr 2015 06:43:03 +0000 (+0300)
Subject: sockopt: add support for querying tcp round-trip-time
X-Git-Tag: frr-2.0-rc1~735
X-Git-Url: https://git.puffer.fish/?a=commitdiff_plain;h=cf279b3abcdaf1bbee65d622f17229b8a0cd32d5;p=mirror%2Ffrr.git

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>
(cherry picked from commit 6b2672f3c9493aef3495192e113f95a7db4b65bc)
---

diff --git a/lib/sockopt.c b/lib/sockopt.c
index be22827f6e..257271bc0b 100644
--- a/lib/sockopt.c
+++ b/lib/sockopt.c
@@ -518,6 +518,22 @@ sockopt_iphdrincl_swab_systoh (struct ip *iph)
   iph->ip_id = ntohs(iph->ip_id);
 }
 
+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)
 {
diff --git a/lib/sockopt.h b/lib/sockopt.h
index aced6d489f..cb14efc7ba 100644
--- a/lib/sockopt.h
+++ b/lib/sockopt.h
@@ -100,6 +100,7 @@ extern int getsockopt_ifindex (int, struct msghdr *);
 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 */