Module Name: src
Committed By: riastradh
Date: Mon Jul 29 02:33:44 UTC 2024
Modified Files:
src/sys/net: if_wg.c
Log Message:
wg(4): Sprinkle comments into wg_swap_sessions.
No functional change intended.
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 -r1.115 -r1.116 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.
Modified files:
Index: src/sys/net/if_wg.c
diff -u src/sys/net/if_wg.c:1.115 src/sys/net/if_wg.c:1.116
--- src/sys/net/if_wg.c:1.115 Mon Jul 29 02:33:27 2024
+++ src/sys/net/if_wg.c Mon Jul 29 02:33:44 2024
@@ -1,4 +1,4 @@
-/* $NetBSD: if_wg.c,v 1.115 2024/07/29 02:33:27 riastradh Exp $ */
+/* $NetBSD: if_wg.c,v 1.116 2024/07/29 02:33:44 riastradh Exp $ */
/*
* Copyright (C) Ryota Ozaki <[email protected]>
@@ -41,7 +41,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_wg.c,v 1.115 2024/07/29 02:33:27 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_wg.c,v 1.116 2024/07/29 02:33:44 riastradh Exp $");
#ifdef _KERNEL_OPT
#include "opt_altq_enabled.h"
@@ -1987,14 +1987,39 @@ wg_swap_sessions(struct wg_peer *wgp)
KASSERT(mutex_owned(wgp->wgp_lock));
+ /*
+ * Get the newly established session, to become the new
+ * session. Caller must have transitioned from INIT_ACTIVE to
+ * INIT_PASSIVE to ESTABLISHED already. This will become the
+ * stable session.
+ */
wgs = wgp->wgp_session_unstable;
KASSERTMSG(wgs->wgs_state == WGS_STATE_ESTABLISHED, "state=%d",
wgs->wgs_state);
+ /*
+ * Get the stable session, which is either the previously
+ * established session in the ESTABLISHED state, or has not
+ * been established at all and is UNKNOWN. This will become
+ * the unstable session.
+ */
wgs_prev = wgp->wgp_session_stable;
KASSERTMSG((wgs_prev->wgs_state == WGS_STATE_ESTABLISHED ||
wgs_prev->wgs_state == WGS_STATE_UNKNOWN),
"state=%d", wgs_prev->wgs_state);
+
+ /*
+ * Publish the newly established session for the tx path to use
+ * and make the other one the unstable session to handle
+ * stragglers in the rx path and later be used for the next
+ * session's handshake.
+ *
+ * If wgs_prev was previously ESTABLISHED, caller must
+ * transition it to DESTROYING and then pass through
+ * wg_put_session_index before recycling it.
+ *
+ * XXX Factor that logic out into this routine.
+ */
atomic_store_release(&wgp->wgp_session_stable, wgs);
wgp->wgp_session_unstable = wgs_prev;
}
