Adding upstream version 8.4.4.upstream/8.4.4upstream

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

1 files changed, 93 insertions, 0 deletions

diff --git a/bgpd/bgp_keepalives.h b/bgpd/bgp_keepalives.h
new file mode 100644
index 0000000..d1cb7d2
--- /dev/null
+++ b/bgpd/bgp_keepalives.h
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+/* BGP Keepalives.
+ * Implements a producer thread to generate BGP keepalives for peers.
+ * Copyright (C) 2017 Cumulus Networks, Inc.
+ * Quentin Young
+ *
+ * This file is part of FRRouting.
+ *
+ * FRRouting is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2, or (at your option) any later
+ * version.
+ *
+ * FRRouting is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; see the file COPYING; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#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 *);
+
+/**
+ * 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 *);
+
+/**
+ * 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);
+
+/**
+ * Poking function for keepalives pthread.
+ *
+ * Under normal circumstances the pthread will automatically wake itself
+ * whenever it is necessary to do work. This function may be used to force the
+ * thread to wake up and see if there is any work to do, or if it is time to
+ * die.
+ *
+ * It is not necessary to call this after bgp_keepalives_on().
+ */
+extern void bgp_keepalives_wake(void);
+
+/**
+ * Stops the thread and blocks until it terminates.
+ */
+int bgp_keepalives_stop(struct frr_pthread *fpt, void **result);
+
+#endif /* _FRR_BGP_KEEPALIVES_H */