[Openvpn-devel] OpenVPN protocol extensions update

[James Y. <ja...@op...>]

I've updated the OpenVPN protocol extension doc with additional details, 
now that more of these features have been implemented in OpenVPN 3.

If you are implementing any of these features in OpenVPN 2.x, please 
review so we can ensure that OpenVPN 2.x and 3 are on the same page with 
respect to protocol extensions.

Changes:

1. Added specific details on DATA_V2/peer-id/float support.

2. For AEAD mode, emphasized that the leading 8 bytes (4 bytes for 
DATA_V2/peer-id and 4 for packet ID) is all included in the AD.

3. Added specific details on protocol negotiation where the client 
indicates protocol extension availability with IV_x parameters in the 
peer info string, and the server responds by pushing directives to the 
client to enable the feature.

4. Added "TCP nonlinear mode" section, a new protocol extension that is 
needed by multithreaded TCP servers.

James