bfdd: integrate distributed BFD

Add hooks in the correct places so the BFD daemon uses the data plane
instead of the software packet sending implementation to monitor the
session.

This code also adds some handlers to support fallback to FRR BFD session
handling, however since this complicates the code it won't work at the
moment (the BFD sockets are disabled by default when using data plane).

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

1 files changed, 27 insertions, 0 deletions

diff --git a/bfdd/bfd.h b/bfdd/bfd.h
index 2a7629b33..8b06ccdd0 100644
--- a/bfdd/bfd.h
+++ b/bfdd/bfd.h
@@ -767,4 +767,31 @@ int ptm_bfd_notify(struct bfd_session *bs, uint8_t notify_state);
  */
 void bfd_dplane_init(const struct sockaddr *sa, socklen_t salen);
 
+/**
+ * Attempts to delegate the BFD session liveness detection to hardware.
+ *
+ * \param bs the BFD session data structure.
+ *
+ * \returns
+ * `0` on success and BFD daemon should do nothing or `-1` on failure
+ * and we should fallback to software implementation.
+ */
+int bfd_dplane_add_session(struct bfd_session *bs);
+
+/**
+ * Send new session settings to data plane.
+ *
+ * \param bs the BFD session to update.
+ */
+int bfd_dplane_update_session(const struct bfd_session *bs);
+
+/**
+ * Deletes session from data plane.
+ *
+ * \param bs the BFD session to delete.
+ *
+ * \returns `0` on success otherwise `-1`.
+ */
+int bfd_dplane_delete_session(struct bfd_session *bs);
+
 #endif /* _BFD_H_ */