Adding upstream version 9.1.upstream/9.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 66 insertions, 0 deletions

diff --git a/bgpd/bgp_keepalives.h b/bgpd/bgp_keepalives.h
new file mode 100644
index 0000000..33e574d
--- /dev/null
+++ b/bgpd/bgp_keepalives.h
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* BGP Keepalives.
+ * Implements a producer thread to generate BGP keepalives for peers.
+ * Copyright (C) 2017 Cumulus Networks, Inc.
+ * Quentin Young
+ */
+
+#ifndef _FRR_BGP_KEEPALIVES_H
+#define _FRR_BGP_KEEPALIVES_H
+
+#include "frr_pthread.h"
+#include "bgpd.h"
+
+/**
+ * Turns on keepalives for a peer.
+ *
+ * This function adds the peer to an internal list of peers to generate
+ * keepalives for.
+ *
+ * At set intervals, a BGP KEEPALIVE packet is generated and placed on
+ * peer->obuf. This operation is thread-safe with respect to peer->obuf.
+ *
+ * peer->v_keepalive determines the interval. Changing this value before
+ * unregistering this peer with bgp_keepalives_off() results in undefined
+ * behavior.
+ *
+ * If the peer is already registered for keepalives via this function, nothing
+ * happens.
+ */
+extern void bgp_keepalives_on(struct peer_connection *connection);
+
+/**
+ * Turns off keepalives for a peer.
+ *
+ * Removes the peer from the internal list of peers to generate keepalives for.
+ *
+ * If the peer is already unregistered for keepalives, nothing happens.
+ */
+extern void bgp_keepalives_off(struct peer_connection *connection);
+
+/**
+ * Pre-run initialization function for keepalives pthread.
+ *
+ * Initializes synchronization primitives. This should be called before
+ * anything else to avoid race conditions.
+ */
+extern void bgp_keepalives_init(void);
+
+/**
+ * Entry function for keepalives pthread.
+ *
+ * This function loops over an internal list of peers, generating keepalives at
+ * regular intervals as determined by each peer's keepalive timer.
+ *
+ * See bgp_keepalives_on() for additional details.
+ *
+ * @param arg pthread arg, not used
+ */
+extern void *bgp_keepalives_start(void *arg);
+
+/**
+ * Stops the thread and blocks until it terminates.
+ */
+int bgp_keepalives_stop(struct frr_pthread *fpt, void **result);
+
+#endif /* _FRR_BGP_KEEPALIVES_H */