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daemon: log more details when netdev_add_defaultroute() fails

Change-Id: I4ac09ec528e6e9169cca813995ba0db583b212a0
Related: SYS#5602
---
M daemon/tun_device.c
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/daemon/tun_device.c b/daemon/tun_device.c
index b1bd7fc..7d1948f 100644
--- a/daemon/tun_device.c
+++ b/daemon/tun_device.c
@@ -290,13 +290,15 @@
 	if (tun->netns_name) {
 		rc = netdev_add_defaultroute(tun->nl, tun->ifindex, AF_INET);
 		if (rc < 0)
-			LOGTUN(tun, LOGL_ERROR, "Cannot add IPv4 default route\n");
+			LOGTUN(tun, LOGL_ERROR, "Cannot add IPv4 default route "
+						"(rc=%d): %s\n", rc, nl_geterror(rc));
 		else
 			LOGTUN(tun, LOGL_INFO, "Added IPv4 default route\n");
 
 		rc = netdev_add_defaultroute(tun->nl, tun->ifindex, AF_INET6);
 		if (rc < 0)
-			LOGTUN(tun, LOGL_ERROR, "Cannot add IPv6 default route\n");
+			LOGTUN(tun, LOGL_ERROR, "Cannot add IPv6 default route "
+						"(rc=%d): %s\n", rc, nl_geterror(rc));
 		else
 			LOGTUN(tun, LOGL_INFO, "Added IPv6 default route\n");
 	}

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