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/*
* Copyright (C) 2013 Kay Sievers
* Copyright (C) 2013 Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Copyright (C) 2013 Daniel Mack <daniel@zonque.org>
* Copyright (C) 2013 Linux Foundation
*
* 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_DOMAIN_H
#define __KDBUS_DOMAIN_H
#include <linux/hashtable.h>
#include <linux/idr.h>
/**
* struct kdbus_domain - domain for buses
* @kref: Reference counter
* @disconnected: Invalidated data
* @name: Name of the domain
* @devpath: /dev base directory path
* @parent: Parent domain
* @id: Global id of this domain
* @major: Device major number for all nodes
* @mode: Device node access mode
* @idr: Map of endpoint minors to buses
* @dev: Control device node, minor == 0
* @lock: Domain data lock
* @bus_seq_last: Last used bus id sequence number
* @msg_seq_last: Last used message id sequence number
* @domain_list: List of child domains
* @domain_entry: Entry in parent domain
* @bus_list: Buses in this domain
* @user_hash: Accounting of user resources
* @user_idr: Map of all users; smallest possible index
*
* A domain provides a "control" device node. Every domain has its
* own major number for its endpoint device nodes.
*
* The initial domain is created at initialization time, is unnamed and
* stays around for forver.
*
* A domain is created by opening the "control" device node of the
* parent domain and issuing the KDBUS_CMD_DOMAIN_MAKE iotcl. Closing this
* file immediately destroys the entire domain.
*/
struct kdbus_domain {
struct kref kref;
bool disconnected;
const char *name;
const char *devpath;
struct kdbus_domain *parent;
u64 id;
unsigned int major;
umode_t mode;
struct idr idr;
struct device *dev;
struct mutex lock;
u64 bus_seq_last;
atomic64_t msg_seq_last;
struct list_head domain_list;
struct list_head domain_entry;
struct list_head bus_list;
DECLARE_HASHTABLE(user_hash, 6);
struct idr user_idr;
void *security;
};
/**
* struct kdbus_domain_user - resource accounting for users
* @kref: Reference counter
* @domain: Domain of the user
* @hentry: Entry in domain user map
* @idr: Smalles possible index number of all users
* @uid: UID of the user
* @buses: Number of buses the user has created
* @connections: Number of connections the user has created
*/
struct kdbus_domain_user {
struct kref kref;
struct kdbus_domain *domain;
struct hlist_node hentry;
unsigned int idr;
kuid_t uid;
atomic_t buses;
atomic_t connections;
};
extern struct kdbus_domain *kdbus_domain_init;
extern struct bus_type kdbus_subsys;
struct kdbus_domain *kdbus_domain_ref(struct kdbus_domain *domain);
struct kdbus_domain *kdbus_domain_unref(struct kdbus_domain *domain);
void kdbus_domain_disconnect(struct kdbus_domain *domain);
int kdbus_domain_new(struct kdbus_domain *parent, const char *name,
umode_t mode, struct kdbus_domain **domain);
int kdbus_domain_make_user(struct kdbus_cmd_make *cmd, char **name);
struct kdbus_domain *kdbus_domain_find_by_major(unsigned int major);
struct kdbus_domain_user
*kdbus_domain_user_find_or_new(struct kdbus_domain *domain, kuid_t uid);
struct kdbus_domain_user *kdbus_domain_user_ref(struct kdbus_domain_user *u);
struct kdbus_domain_user *kdbus_domain_user_unref(struct kdbus_domain_user *u);
#endif
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