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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.
*/
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include "message.h"
#include "notify.h"
static int kdbus_notify_reply(u64 id, u64 cookie, u64 msg_type,
struct list_head *queue_list)
{
struct kdbus_kmsg *kmsg = NULL;
int ret;
BUG_ON(id == 0);
ret = kdbus_kmsg_new(0, &kmsg);
if (ret < 0)
return ret;
/*
* a kernel-generated notification can only contain one
* struct kdbus_item, so make a shortcut here for
* faster lookup in the match db.
*/
kmsg->notify_type = msg_type;
kmsg->msg.dst_id = id;
kmsg->msg.src_id = KDBUS_SRC_ID_KERNEL;
kmsg->msg.payload_type = KDBUS_PAYLOAD_KERNEL;
kmsg->msg.cookie_reply = cookie;
kmsg->msg.items[0].type = msg_type;
list_add_tail(&kmsg->queue_entry, queue_list);
return ret;
}
/**
* kdbus_notify_reply_timeout() - queue a timeout reply
* @id: The destination's connection ID
* @cookie: The cookie to set in the reply.
* @queue_list: A queue list for the newly generated kdbus_kmsg.
* The caller has to free all items in the list using
* kdbus_kmsg_free(). Maybe NULL, in which case this
* function does nothing.
*
* Queues a message that has a KDBUS_ITEM_REPLY_TIMEOUT item attached.
*
* Return: 0 on success, negative errno on failure.
*/
int kdbus_notify_reply_timeout(u64 id, u64 cookie, struct list_head *queue_list)
{
return kdbus_notify_reply(id, cookie, KDBUS_ITEM_REPLY_TIMEOUT,
queue_list);
}
/**
* kdbus_notify_reply_dead() - queue a 'dead' reply
* @id: The destination's connection ID
* @cookie: The cookie to set in the reply.
* @queue_list: A queue list for the newly generated kdbus_kmsg.
* The caller has to free all items in the list using
* kdbus_kmsg_free(). Maybe NULL, in which case this
* function does nothing.
*
* Queues a message that has a KDBUS_ITEM_REPLY_DEAD item attached.
*
* Return: 0 on success, negative errno on failure.
*/
int kdbus_notify_reply_dead(u64 id, u64 cookie, struct list_head *queue_list)
{
return kdbus_notify_reply(id, cookie, KDBUS_ITEM_REPLY_DEAD,
queue_list);
}
/**
* kdbus_notify_name_change() - queue a notification about a name owner change
* @type: The type if the notification; KDBUS_ITEM_NAME_ADD,
* KDBUS_ITEM_NAME_CHANGE or KDBUS_ITEM_NAME_REMOVE
* @old_id: The id of the connection that used to own the name
* @new_id: The id of the new owner connection
* @old_flags: The flags to pass in the KDBUS_ITEM flags field for
* the old owner
* @new_flags: The flags to pass in the KDBUS_ITEM flags field for
* the new owner
* @name: The name that was removed or assigned to a new owner
* @queue_list: A queue list for the newly generated kdbus_kmsg.
* The caller has to free all items in the list using
* kdbus_kmsg_free(). Maybe NULL, in which case this
* function does nothing.
*
* Return: 0 on success, negative errno on failure.
*/
int kdbus_notify_name_change(u64 type,
u64 old_id, u64 new_id,
u64 old_flags, u64 new_flags,
const char *name,
struct list_head *queue_list)
{
struct kdbus_kmsg *kmsg = NULL;
size_t name_len, extra_size;
int ret;
if (!queue_list)
return 0;
name_len = strlen(name) + 1;
extra_size = sizeof(struct kdbus_notify_name_change) + name_len;
ret = kdbus_kmsg_new(extra_size, &kmsg);
if (ret < 0)
return ret;
kmsg->msg.dst_id = KDBUS_DST_ID_BROADCAST;
kmsg->msg.src_id = KDBUS_SRC_ID_KERNEL;
kmsg->notify_type = type;
kmsg->notify_old_id = old_id;
kmsg->notify_new_id = new_id;
kmsg->msg.items[0].type = type;
kmsg->msg.items[0].name_change.old.id = old_id;
kmsg->msg.items[0].name_change.old.flags = old_flags;
kmsg->msg.items[0].name_change.new.id = new_id;
kmsg->msg.items[0].name_change.new.flags = new_flags;
memcpy(kmsg->msg.items[0].name_change.name, name, name_len);
kmsg->notify_name = kmsg->msg.items[0].name_change.name;
list_add_tail(&kmsg->queue_entry, queue_list);
return ret;
}
/**
* kdbus_notify_id_change() - queue a notification about a unique ID change
* @type: The type if the notification; KDBUS_ITEM_ID_ADD or
* KDBUS_ITEM_ID_REMOVE
* @id: The id of the connection that was added or removed
* @flags: The flags to pass in the KDBUS_ITEM flags field
* @queue_list: A queue list for the newly generated kdbus_kmsg.
* The caller has to free all items in the list using
* kdbus_kmsg_free(). Maybe NULL, in which case this
* function does nothing.
*
* Return: 0 on success, negative errno on failure.
*/
int kdbus_notify_id_change(u64 type, u64 id, u64 flags,
struct list_head *queue_list)
{
struct kdbus_kmsg *kmsg = NULL;
int ret;
ret = kdbus_kmsg_new(sizeof(struct kdbus_notify_id_change), &kmsg);
if (ret < 0)
return ret;
kmsg->msg.dst_id = KDBUS_DST_ID_BROADCAST;
kmsg->msg.src_id = KDBUS_SRC_ID_KERNEL;
kmsg->notify_type = type;
switch (type) {
case KDBUS_ITEM_ID_ADD:
kmsg->notify_new_id = id;
break;
case KDBUS_ITEM_ID_REMOVE:
kmsg->notify_old_id = id;
break;
default:
BUG();
}
kmsg->msg.items[0].type = type;
kmsg->msg.items[0].id_change.id = id;
kmsg->msg.items[0].id_change.flags = flags;
list_add_tail(&kmsg->queue_entry, queue_list);
return ret;
}
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