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diff --git a/src/seti/gnunet-service-seti_protocol.h b/src/seti/gnunet-service-seti_protocol.h
new file mode 100644
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+++ b/src/seti/gnunet-service-seti_protocol.h
@@ -0,0 +1,144 @@
+/*
+     This file is part of GNUnet.
+     Copyright (C) 2013, 2014, 2020 GNUnet e.V.
+
+     GNUnet is free software: you can redistribute it and/or modify it
+     under the terms of the GNU Affero General Public License as published
+     by the Free Software Foundation, either version 3 of the License,
+     or (at your option) any later version.
+
+     GNUnet 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
+     Affero General Public License for more details.
+
+     You should have received a copy of the GNU Affero General Public License
+     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+     SPDX-License-Identifier: AGPL3.0-or-later
+ */
+/**
+ * @author Florian Dold
+ * @author Christian Grothoff
+ * @file seti/gnunet-service-seti_protocol.h
+ * @brief Peer-to-Peer messages for gnunet set
+ */
+#ifndef SETI_PROTOCOL_H
+#define SETI_PROTOCOL_H
+
+#include "platform.h"
+#include "gnunet_common.h"
+
+
+GNUNET_NETWORK_STRUCT_BEGIN
+
+struct OperationRequestMessage
+{
+  /**
+   * Type: #GNUNET_MESSAGE_TYPE_SET_P2P_OPERATION_REQUEST
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * For Intersection: my element count
+   */
+  uint32_t element_count GNUNET_PACKED;
+
+  /**
+   * Application-specific identifier of the request.
+   */
+  struct GNUNET_HashCode app_idX;
+
+  /* rest: optional message */
+};
+
+
+/**
+ * During intersection, the first (and possibly second) message
+ * send it the number of elements in the set, to allow the peers
+ * to decide who should start with the Bloom filter.
+ */
+struct IntersectionElementInfoMessage
+{
+  /**
+   * Type: #GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_ELEMENT_INFO
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * mutator used with this bloomfilter.
+   */
+  uint32_t sender_element_count GNUNET_PACKED;
+};
+
+
+/**
+ * Bloom filter messages exchanged for set intersection calculation.
+ */
+struct BFMessage
+{
+  /**
+   * Type: #GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_BF
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * Number of elements the sender still has in the set.
+   */
+  uint32_t sender_element_count GNUNET_PACKED;
+
+  /**
+   * XOR of all hashes over all elements remaining in the set.
+   * Used to determine termination.
+   */
+  struct GNUNET_HashCode element_xor_hash;
+
+  /**
+   * Mutator used with this bloomfilter.
+   */
+  uint32_t sender_mutator GNUNET_PACKED;
+
+  /**
+   * Total length of the bloomfilter data.
+   */
+  uint32_t bloomfilter_total_length GNUNET_PACKED;
+
+  /**
+   * Number of bits (k-value) used in encoding the bloomfilter.
+   */
+  uint32_t bits_per_element GNUNET_PACKED;
+
+  /**
+   * rest: the sender's bloomfilter
+   */
+};
+
+
+/**
+ * Last message, send to confirm the final set.  Contains the element
+ * count as it is possible that the peer determined that we were done
+ * by getting the empty set, which in that case also needs to be
+ * communicated.
+ */
+struct IntersectionDoneMessage
+{
+  /**
+   * Type: #GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_DONE
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * Final number of elements in intersection.
+   */
+  uint32_t final_element_count GNUNET_PACKED;
+
+  /**
+   * XOR of all hashes over all elements remaining in the set.
+   */
+  struct GNUNET_HashCode element_xor_hash;
+};
+
+
+GNUNET_NETWORK_STRUCT_END
+
+#endif