From: Guus Sliepen <guus@sliepen.org>
Date: Fri, 27 Mar 2020 21:12:20 +0000 (+0100)
Subject: Add better debugging of UDP style connections.
X-Git-Url: https://git.meshlink.io/?a=commitdiff_plain;h=36994569d1ba6839207761591964189d189c92d1;p=utcp

Add better debugging of UDP style connections.

Report packets that are out of order, either because of reordering or
packet loss.
---

diff --git a/utcp.c b/utcp.c
index 72bb41d..50c7e36 100644
--- a/utcp.c
+++ b/utcp.c
@@ -1252,6 +1252,19 @@ synack:
 			// Otherwise, continue processing.
 			len = 0;
 		}
+	} else {
+#if UTCP_DEBUG
+		int32_t rcv_offset = seqdiff(hdr.seq, c->rcv.nxt);
+
+		if(rcv_offset) {
+			debug(c, "packet out of order, offset %u bytes", rcv_offset);
+		}
+
+		if(rcv_offset >= 0) {
+			c->rcv.nxt = hdr.seq + len;
+		}
+
+#endif
 	}
 
 	c->snd.wnd = hdr.wnd; // TODO: move below