connectd: add dev_uniform_padding to connectd_wire.csv
What the developer wrote
Authored by Sangbida Chaudhuri
connectd: add dev_uniform_padding to connectd_wire.csv
This boolean allows lightningd and connectd to be on the same page on whether the uniform padding experimental flag is enabled.
What changed, and why it matters
This commit adds a single boolean flag called dev_uniform_padding to an internal message definition file. The flag lets two parts of the Core Lightning software agree whether an experimental traffic-padding feature is turned on. It is a wiring-only change: no actual padding logic is added or changed here, and there is no indication it fixes a security bug.
No security action required. Review as part of normal feature development if tracking the dev_uniform_padding experimental option.
Security signals we found
No strong security signals were identified.
Evidence from the diff
The diff adds one msgdata line to connectd/connectd_wire.csv, declaring a new bool field dev_uniform_padding on the connectd_init message. The accompanying comment states it pads outgoing messages to uniform 1460-byte segments as a traffic-analysis defence. This is purely a protocol-definition change that exposes the existing experimental flag to connectd; it does not implement, modify, or patch any cryptographic, network, or parsing behavior.
Changed components
connectd/connectd_wire.csvInspect captured patch +2 / −0
diff --git a/connectd/connectd_wire.csv b/connectd/connectd_wire.csv
index d5f6aee3..700e6829 100644
--- a/connectd/connectd_wire.csv
+++ b/connectd/connectd_wire.csv
@@ -29,6 +29,8 @@ msgdata,connectd_init,dev_no_reconnect,bool,
msgdata,connectd_init,dev_fast_reconnect,bool,
msgdata,connectd_init,dev_limit_connections_inflight,bool,
msgdata,connectd_init,dev_keep_nagle,bool,
+# Pad outgoing messages to uniform 1460-byte segments (traffic analysis defence)
+msgdata,connectd_init,dev_uniform_padding,bool,
# Connectd->master, here are the addresses I bound, can announce.
msgtype,connectd_init_reply,2100
Why this scored 15/100
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