Implement new hash table to keep track of unknown peers handshakes have been sent to

This should significantly reduce the number of handshakes sent after restarting
fastd with many active connections.

1 files changed, 23 insertions, 1 deletions

diff --git a/src/peer_hashtable.h b/src/peer_hashtable.h
index 0923a50..79b8f28 100644
--- a/src/peer_hashtable.h
+++ b/src/peer_hashtable.h
@@ -33,7 +33,29 @@
 #pragma once
 
 
-#include "types.h"
+#include "hash.h"
+#include "peer.h"
+
+
+/** Hashes a peer address */
+static inline void fastd_peer_address_hash(uint32_t *hash, const fastd_peer_address_t *addr) {
+	switch(addr->sa.sa_family) {
+	case AF_INET:
+		fastd_hash(hash, &addr->in.sin_addr.s_addr, sizeof(addr->in.sin_addr.s_addr));
+		fastd_hash(hash, &addr->in.sin_port, sizeof(addr->in.sin_port));
+		break;
+
+	case AF_INET6:
+		fastd_hash(hash, &addr->in6.sin6_addr, sizeof(addr->in6.sin6_addr));
+		fastd_hash(hash, &addr->in6.sin6_port, sizeof(addr->in6.sin6_port));
+		if (IN6_IS_ADDR_LINKLOCAL(&addr->in6.sin6_addr))
+			fastd_hash(hash, &addr->in6.sin6_scope_id, sizeof(addr->in6.sin6_scope_id));
+		break;
+
+	default:
+		exit_bug("peer_address_bucket: unknown address family");
+	}
+}
 
 
 void fastd_peer_hashtable_init(void);