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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 */
/* Version 1 had no target address field in struct fwd_rule. It was released,
* but was little enough used that we decided not to implement backwards
* compatiblity code (i.e. a v2 pesto will not work with a v1 pasta)
*/
#define PESTO_PROTOCOL_VERSION 2
/* 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 */
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