PR/55729 CVS commit: src/sys/net

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

The following reply was made to PR kern/55729; it has been noted by GNATS.

From: "Taylor R Campbell" <riastradh%netbsd.org@localhost>
To: gnats-bugs%gnats.NetBSD.org@localhost
Cc: 
Subject: PR/55729 CVS commit: src/sys/net
Date: Sun, 28 Jul 2024 14:37:59 +0000

 Module Name:	src
 Committed By:	riastradh
 Date:		Sun Jul 28 14:37:59 UTC 2024
 
 Modified Files:
 	src/sys/net: if_wg.c
 
 Log Message:
 wg(4): Rework some details of internal session state machine.
 
 This way:
 
 - There is a clear transition between when a session is being set up,
   and when it is exposed to the data rx path (wg_handle_msg_data):
   atomic_store_release to set wgs->wgs_state to INIT_PASSIVE or
   ESTABLISHED.
 
   (The transition INIT_PASSIVE -> ESTABLISHED is immaterial to the
   data rx path, so that's just atomic_store_relaxed.  Similarly the
   transition to DESTROYING.)
 
 - There is a clear transition between when a session is being set up,
   and when it is exposed to the data tx path (wg_output):
   atomic_store_release to set wgp->wgp_session_stable to it.
 
 - Every path that reinitializes a session must go through
   wg_destroy_session via wg_put_index_session first.  This avoids
   races between session reuse and the data rx/tx paths.
 
 - Add a log message at the time of every state transition.
 
 Prompted by:
 
 PR kern/55729: net/if_wg/t_misc:wg_rekey test case fails
 PR kern/56252: wg(4) state machine has race conditions
 PR kern/58463: if_wg does not work when idle.
 
 
 To generate a diff of this commit:
 cvs rdiff -u -r1.93 -r1.94 src/sys/net/if_wg.c
 
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.