zebra: add ZEBRA_IF_DUMMY flag for dummy interfaces

Introduce ZEBRA_IF_DUMMY interface flag to identify Linux dummy interfaces [0].
These interfaces behave similarly to loopback interfaces and can be
specially handled by daemons.

[0]: https://github.com/torvalds/linux/blob/master/drivers/net/dummy.c

Signed-off-by: Gabriel Goller <g.goller@proxmox.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/if.h b/lib/if.h
index 1e52020b64..897f2be239 100644
--- a/lib/if.h
+++ b/lib/if.h
@@ -242,6 +242,7 @@ struct interface {
 #define ZEBRA_INTERFACE_SUB        (1 << 1)
 #define ZEBRA_INTERFACE_LINKDETECTION (1 << 2)
 #define ZEBRA_INTERFACE_VRF_LOOPBACK (1 << 3)
+#define ZEBRA_INTERFACE_DUMMY (1 << 4)
 
 	/* Interface flags. */
 	uint64_t flags;