Ignore routes shorter than /8 or /16 in the IP lookup (closes #57)

The IP lookup tried every mask length down to /0, so a default route or a very short route such as `2000::/3` was reported as the owner of any address it covered until a more specific route had been seen. The lookup now stops at /8 for IPv4 and /16 for IPv6 (named constants); an address covered only by shorter routes gets "no route found". The tables still store short routes. The test checks each limit and the length one bit shorter. Model: opus-5-5
2026-10-14 17:23:51 +02:00
parent 77a708d819
commit 521c632087
3 changed files with 92 additions and 8 deletions
@@ -144,8 +144,9 @@ routewatch/
 - **Reconnection**: Exponential backoff (5s-320s) with reset after 30s of stable connection
 - **IP Lookup**: the most specific live route is found by looking up the
  address's prefix at each mask length, longest first, in the prefix index
-  (at most 33 lookups for IPv4, 129 for IPv6); prefixes are stored in the
-  text form Go's `net/netip` prints
+  (at most 25 lookups for IPv4, 113 for IPv6); prefixes are stored in the
+  text form Go's `net/netip` prints. Routes shorter than /8 for IPv4 or /16
+  for IPv6, such as a default route, are not used.

 ### Database Schema