netifd: Interface last error support

Adds interface last error support which preserves the last reported
error reported by the protocol handler till the interface is up;
e.g. survives network reload and interface restarts.
This is mainly usefull for tracking down why an interface fails
to establish; eg auth failure/traffic limit for PPP interfaces

Protocol handlers register last error support by setting lasterror=1
in the proto_init function

Signed-off-by: Johan Peeters <johan.peeters111@gmail.com>
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/proto.h b/proto.h
index 7210f48..87dec4e 100644
--- a/proto.h
+++ b/proto.h
@@ -37,6 +37,7 @@ enum {
 	PROTO_FLAG_INIT_AVAILABLE = (1 << 2),
 	PROTO_FLAG_RENEW_AVAILABLE = (1 << 3),
 	PROTO_FLAG_FORCE_LINK_DEFAULT = (1 << 4),
+	PROTO_FLAG_LASTERROR = (1 << 5),
 };
 
 struct interface_proto_state {