From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sat, 21 Aug 2021 23:20:55 +0000 (+0100)
Subject: Note about packet loops
X-Git-Tag: hippotat/1.0.0~121
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=hippotat.git;a=commitdiff_plain;h=bf74443acd199f601360f30604303052291c7672

Note about packet loops

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---

diff --git a/server/server.rs b/server/server.rs
index 3093684..a493428 100644
--- a/server/server.rs
+++ b/server/server.rs
@@ -39,6 +39,11 @@ pub struct RoutedPacket {
 pub type RoutedPacketData = Box<[u8]>;
 
 // loop prevention
+// we don't decrement the ttl (naughty) but loops cannot arise
+// because only the server has any routing code, and server
+// has no internal loops, so worst case is
+//  client if -> client -> server -> client' -> client if'
+// and the ifs will decrement the ttl.
 mod may_route {
   #[derive(Clone,Debug)]
   pub struct MayRoute(());