--- /dev/null
+/*
+ *
+ * Copyright 2016 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#ifndef GRPC_IMPL_CODEGEN_PROPAGATION_BITS_H
+#define GRPC_IMPL_CODEGEN_PROPAGATION_BITS_H
+
+#include <grpc/impl/codegen/port_platform.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Propagation bits: this can be bitwise or-ed to form propagation_mask for
+ * grpc_call */
+/** Propagate deadline */
+#define GRPC_PROPAGATE_DEADLINE ((uint32_t)1)
+/** Propagate census context */
+#define GRPC_PROPAGATE_CENSUS_STATS_CONTEXT ((uint32_t)2)
+#define GRPC_PROPAGATE_CENSUS_TRACING_CONTEXT ((uint32_t)4)
+/** Propagate cancellation */
+#define GRPC_PROPAGATE_CANCELLATION ((uint32_t)8)
+
+/** Default propagation mask: clients of the core API are encouraged to encode
+ deltas from this in their implementations... ie write:
+ GRPC_PROPAGATE_DEFAULTS & ~GRPC_PROPAGATE_DEADLINE to disable deadline
+ propagation. Doing so gives flexibility in the future to define new
+ propagation types that are default inherited or not. */
+#define GRPC_PROPAGATE_DEFAULTS \
+ ((uint32_t)(( \
+ 0xffff | GRPC_PROPAGATE_DEADLINE | GRPC_PROPAGATE_CENSUS_STATS_CONTEXT | \
+ GRPC_PROPAGATE_CENSUS_TRACING_CONTEXT | GRPC_PROPAGATE_CANCELLATION)))
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* GRPC_IMPL_CODEGEN_PROPAGATION_BITS_H */