bfdd: imported new daemon source code

Import source code from external `bfdd` daemon ported from Cumulus PTM.

Signed-off-by: Rafael Zalamena <rzalamena@opensourcerouting.org>

1 files changed, 155 insertions, 0 deletions

diff --git a/bfdd/event.c b/bfdd/event.c
new file mode 100644
index 000000000..ba12f5b4e
--- /dev/null
+++ b/bfdd/event.c
@@ -0,0 +1,155 @@
+/*********************************************************************
+ * Copyright 2017-2018 Network Device Education Foundation, Inc. ("NetDEF")
+ *
+ * This program 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 of the License, or (at your option)
+ * any later version.
+ *
+ * This program 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
+ *
+ * event.c: implements the BFD loop event handlers.
+ *
+ * Authors
+ * -------
+ * Rafael Zalamena <rzalamena@opensourcerouting.org>
+ */
+
+#include <zebra.h>
+
+#include "bfd.h"
+
+void tv_normalize(struct timeval *tv);
+
+void tv_normalize(struct timeval *tv)
+{
+	/* Remove seconds part from microseconds. */
+	tv->tv_sec = tv->tv_usec / 1000000;
+	tv->tv_usec = tv->tv_usec % 1000000;
+}
+
+void bfd_recvtimer_update(struct bfd_session *bs)
+{
+	struct timeval tv = {.tv_sec = 0, .tv_usec = bs->detect_TO};
+
+	/* Don't add event if peer is deactivated. */
+	if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_SHUTDOWN))
+		return;
+
+	tv_normalize(&tv);
+#ifdef BFD_EVENT_DEBUG
+	log_debug("%s: sec = %ld, usec = %ld", __func__, tv.tv_sec, tv.tv_usec);
+#endif /* BFD_EVENT_DEBUG */
+
+	/* Remove previous schedule if any. */
+	if (bs->recvtimer_ev)
+		bfd_recvtimer_delete(bs);
+
+	thread_add_timer_tv(master, bfd_recvtimer_cb, bs, &tv,
+			    &bs->recvtimer_ev);
+}
+
+void bfd_echo_recvtimer_update(struct bfd_session *bs)
+{
+	struct timeval tv = {.tv_sec = 0, .tv_usec = bs->echo_detect_TO};
+
+	/* Don't add event if peer is deactivated. */
+	if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_SHUTDOWN))
+		return;
+
+	tv_normalize(&tv);
+#ifdef BFD_EVENT_DEBUG
+	log_debug("%s: sec = %ld, usec = %ld", __func__, tv.tv_sec, tv.tv_usec);
+#endif /* BFD_EVENT_DEBUG */
+
+	/* Remove previous schedule if any. */
+	if (bs->echo_recvtimer_ev)
+		bfd_echo_recvtimer_delete(bs);
+
+	thread_add_timer_tv(master, bfd_echo_recvtimer_cb, bs, &tv,
+			    &bs->echo_recvtimer_ev);
+}
+
+void bfd_xmttimer_update(struct bfd_session *bs, uint64_t jitter)
+{
+	struct timeval tv = {.tv_sec = 0, .tv_usec = jitter};
+
+	/* Don't add event if peer is deactivated. */
+	if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_SHUTDOWN))
+		return;
+
+	tv_normalize(&tv);
+#ifdef BFD_EVENT_DEBUG
+	log_debug("%s: sec = %ld, usec = %ld", __func__, tv.tv_sec, tv.tv_usec);
+#endif /* BFD_EVENT_DEBUG */
+
+	/* Remove previous schedule if any. */
+	if (bs->xmttimer_ev)
+		bfd_xmttimer_delete(bs);
+
+	thread_add_timer_tv(master, bfd_xmt_cb, bs, &tv, &bs->xmttimer_ev);
+}
+
+void bfd_echo_xmttimer_update(struct bfd_session *bs, uint64_t jitter)
+{
+	struct timeval tv = {.tv_sec = 0, .tv_usec = jitter};
+
+	/* Don't add event if peer is deactivated. */
+	if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_SHUTDOWN))
+		return;
+
+	tv_normalize(&tv);
+#ifdef BFD_EVENT_DEBUG
+	log_debug("%s: sec = %ld, usec = %ld", __func__, tv.tv_sec, tv.tv_usec);
+#endif /* BFD_EVENT_DEBUG */
+
+	/* Remove previous schedule if any. */
+	if (bs->echo_xmttimer_ev)
+		bfd_echo_xmttimer_delete(bs);
+
+	thread_add_timer_tv(master, bfd_echo_xmt_cb, bs, &tv,
+			    &bs->echo_xmttimer_ev);
+}
+
+void bfd_recvtimer_delete(struct bfd_session *bs)
+{
+	if (bs->recvtimer_ev == NULL)
+		return;
+
+	thread_cancel(bs->recvtimer_ev);
+	bs->recvtimer_ev = NULL;
+}
+
+void bfd_echo_recvtimer_delete(struct bfd_session *bs)
+{
+	if (bs->echo_recvtimer_ev == NULL)
+		return;
+
+	thread_cancel(bs->echo_recvtimer_ev);
+	bs->echo_recvtimer_ev = NULL;
+}
+
+void bfd_xmttimer_delete(struct bfd_session *bs)
+{
+	if (bs->xmttimer_ev == NULL)
+		return;
+
+	thread_cancel(bs->xmttimer_ev);
+	bs->xmttimer_ev = NULL;
+}
+
+void bfd_echo_xmttimer_delete(struct bfd_session *bs)
+{
+	if (bs->echo_xmttimer_ev == NULL)
+		return;
+
+	thread_cancel(bs->echo_xmttimer_ev);
+	bs->echo_xmttimer_ev = NULL;
+}