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* Copyright (C) 2013-2015 Kay Sievers
* Copyright (C) 2013-2015 Greg Kroah-Hartman <>
* Copyright (C) 2013-2015 Daniel Mack <>
* Copyright (C) 2013-2015 David Herrmann <>
* Copyright (C) 2013-2015 Linux Foundation
* Copyright (C) 2014-2015 Djalal Harouni <>
* kdbus is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation; either version 2.1 of the License, or (at
* your option) any later version.
#ifndef __KDBUS_BUS_H
#define __KDBUS_BUS_H
#include <linux/hashtable.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/rwsem.h>
#include <linux/spinlock.h>
#include "kdbus.h"
#include "metadata.h"
#include "names.h"
#include "node.h"
#include "policy.h"
struct kdbus_conn;
struct kdbus_domain;
struct kdbus_kmsg;
struct kdbus_user;
* struct kdbus_bus - bus in a domain
* @node: kdbus_node
* @id: ID of this bus in the domain
* @bus_flags: Simple pass-through flags from userspace to userspace
* @attach_flags_req: KDBUS_ATTACH_* flags required by connecting peers
* @attach_flags_owner: KDBUS_ATTACH_* flags of bus creator that other
* connections can see or query
* @id128: Unique random 128 bit ID of this bus
* @bloom: Bloom parameters
* @domain: Domain of this bus
* @creator: Creator of the bus
* @creator_meta: Meta information about the bus creator
* @policy_db: Policy database for this bus
* @name_registry: Name registry of this bus
* @conn_rwlock: Read/Write lock for all lists of child connections
* @conn_hash: Map of connection IDs
* @monitors_list: Connections that monitor this bus
* @notify_list: List of pending kernel-generated messages
* @notify_lock: Notification list lock
* @notify_flush_lock: Notification flushing lock
struct kdbus_bus {
struct kdbus_node node;
/* static */
u64 id;
u64 bus_flags;
u64 attach_flags_req;
u64 attach_flags_owner;
u8 id128[16];
struct kdbus_bloom_parameter bloom;
struct kdbus_domain *domain;
struct kdbus_user *creator;
struct kdbus_meta_proc *creator_meta;
/* protected by own locks */
struct kdbus_policy_db policy_db;
struct kdbus_name_registry *name_registry;
/* protected by conn_rwlock */
struct rw_semaphore conn_rwlock;
DECLARE_HASHTABLE(conn_hash, 8);
struct list_head monitors_list;
/* protected by notify_lock */
struct list_head notify_list;
spinlock_t notify_lock;
struct mutex notify_flush_lock;
struct kdbus_bus *kdbus_bus_ref(struct kdbus_bus *bus);
struct kdbus_bus *kdbus_bus_unref(struct kdbus_bus *bus);
struct kdbus_conn *kdbus_bus_find_conn_by_id(struct kdbus_bus *bus, u64 id);
void kdbus_bus_broadcast(struct kdbus_bus *bus,
struct kdbus_conn *conn_src,
struct kdbus_kmsg *kmsg);
void kdbus_bus_eavesdrop(struct kdbus_bus *bus,
struct kdbus_conn *conn_src,
struct kdbus_kmsg *kmsg);
struct kdbus_bus *kdbus_cmd_bus_make(struct kdbus_domain *domain,
void __user *argp);
int kdbus_cmd_bus_creator_info(struct kdbus_conn *conn, void __user *argp);