hashtables: allow up to 2^{20} peers per interface

This allows for nearly 1 million peers per interface, which should be
more than enough. If needed later, this number could easily be increased
beyond this.

We also increase the size of the hashtables to accommodate this upper
bound. In the future, it might be smart to dynamically expand the
hashtable instead of this hard coded compromise value between small
systems and large systems.

Ongoing work includes figuring out the most optimal scheme for these
hashtables and for the insertion to mask their order from timing
inference.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/uapi.h b/src/uapi.h
index 1cc2bba..e699025 100644
--- a/src/uapi.h
+++ b/src/uapi.h
@@ -128,7 +128,7 @@ enum {
 };
 
 enum {
-	WG_API_VERSION_MAGIC = 0xbeef0002
+	WG_API_VERSION_MAGIC = 0xbeef0003
 };
 
 struct wgdevice {
@@ -142,7 +142,7 @@ struct wgdevice {
 	__u16 port; /* Get/Set */
 
 	union {
-		__u16 num_peers; /* Get/Set */
+		__u32 num_peers; /* Get/Set */
 		__u32 peers_size; /* Get */
 	};
 };