1 files changed, 54 insertions, 0 deletions
diff --git a/pesto.h b/pesto.h
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index 0000000..980cc17
--- /dev/null
+++ b/pesto.h
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+/* SPDX-License-Identifier: GPL-2.0-or-later
+ * Copyright Red Hat
+ * Author: David Gibson <david@gibson.dropbear.id.au>
+ *
+ * Definitions and functions used by both client and server of the configuration
+ * update protocol (pesto).
+ */
+
+#ifndef PESTO_H
+#define PESTO_H
+
+#include <assert.h>
+#include <stdint.h>
+
+#define PESTO_SERVER_MAGIC	"basil:s"
+
+/* Version 0 is reserved for unreleased / unsupported experimental versions */
+#define PESTO_PROTOCOL_VERSION	1
+
+/* Maximum size of a pif name, including \0 */
+#define	PIF_NAME_SIZE	(128)
+#define PIF_NONE	0
+
+/**
+ * struct pesto_hello - Server introduction message
+ * @magic:		PESTO_SERVER_MAGIC
+ * @version:		Version number
+ * @pif_name_size:	Server's value for PIF_NAME_SIZE
+ * @ifnamsiz:		Server's value for IFNAMSIZ
+ */
+struct pesto_hello {
+	char magic[8];
+	uint32_t version;
+	uint32_t pif_name_size;
+	uint32_t ifnamsiz;
+} __attribute__ ((__packed__));
+
+static_assert(sizeof(PESTO_SERVER_MAGIC)
+	      == sizeof(((struct pesto_hello *)0)->magic),
+	      "PESTO_SERVER_MAGIC has wrong size");
+
+/**
+ * struct pesto_pif_info - Message with basic metadata about a pif
+ * @name:	Name (\0 terminated)
+ * @caps:	Forwarding capabilities for this pif
+ * @count:	Number of forwarding rules for this pif
+ */
+struct pesto_pif_info {
+	char name[PIF_NAME_SIZE];
+	uint32_t caps;
+	uint32_t count;
+} __attribute__ ((__packed__));
+
+#endif /* PESTO_H */