peer: store total number of peers instead of iterating

This is faster, since it means adding a new peer is O(1) instead of
O(n). It's also safe to do because we're holding the device_update_lock
on both the ++ and the --.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/device.h b/src/device.h
index 4932477..a74f58b 100644
--- a/src/device.h
+++ b/src/device.h
@@ -49,7 +49,7 @@ struct wireguard_device {
 	struct routing_table peer_routing_table;
 	struct mutex device_update_lock, socket_update_lock;
 	struct list_head device_list, peer_list;
-	unsigned int device_update_gen;
+	unsigned int num_peers, device_update_gen;
 	u32 fwmark;
 	u16 incoming_port;
 };