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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/module.h>
#include <linux/device.h>
#include <linux/idr.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/mutex.h>
#include <linux/init.h>
#include <linux/poll.h>
#include "notify.h"
#include "bus.h"
#include "endpoint.h"
#include "message.h"
#include "connection.h"
static int kdbus_notify_reply(struct kdbus_ep *ep, u64 src_id,
u64 cookie, u64 msg_type)
{
struct kdbus_conn *dst_conn;
struct kdbus_kmsg *kmsg;
struct kdbus_item *item;
int ret;
mutex_lock(&ep->bus->lock);
dst_conn = kdbus_bus_find_conn_by_id(ep->bus, src_id);
mutex_unlock(&ep->bus->lock);
if (!dst_conn)
return -ENXIO;
ret = kdbus_kmsg_new(KDBUS_PART_SIZE(0), &kmsg);
if (ret < 0)
goto exit_unref_conn;
/*
* a kernel-generated notification can only contain one
* struct kdbus_item, so make a shortcut here for
* faster lookup in the match db.
*/
kmsg->notification_type = msg_type;
kmsg->msg.dst_id = src_id;
kmsg->msg.src_id = KDBUS_SRC_ID_KERNEL;
kmsg->msg.payload_type = KDBUS_PAYLOAD_KERNEL;
kmsg->msg.cookie_reply = cookie;
item = kmsg->msg.items;
item->type = msg_type;
ret = kdbus_conn_kmsg_send(ep, NULL, kmsg);
kdbus_kmsg_free(kmsg);
exit_unref_conn:
kdbus_conn_unref(dst_conn);
return ret;
}
/**
* kdbus_notify_reply_timeout - send a timeout reply
* @ep: The endpoint to use for sending
* @src_id: The id to use as sender address
* @cookie The cookie to set in the reply.
*
* Sends a message that has a KDBUS_ITEM_REPLY_TIMEOUT item attached.
* Returns 0 on success, or a negative error code.
*/
int kdbus_notify_reply_timeout(struct kdbus_ep *ep, u64 src_id, u64 cookie)
{
return kdbus_notify_reply(ep, src_id, cookie, KDBUS_ITEM_REPLY_TIMEOUT);
}
/**
* kdbus_notify_reply_dead - send a 'dead' reply
* @ep: The endpoint to use for sending
* @src_id: The id to use as sender address
* @cookie The cookie to set in the reply.
*
* Sends a message that has a KDBUS_ITEM_REPLY_DEAD item attached.
* Returns 0 on success, or a negative error code.
*/
int kdbus_notify_reply_dead(struct kdbus_ep *ep, u64 src_id, u64 cookie)
{
return kdbus_notify_reply(ep, src_id, cookie, KDBUS_ITEM_REPLY_DEAD);
}
/**
* kdbus_notify_name_change - send a notification about a name owner change
* @ep: The endpoint to use for sending
* @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
* @flags: The flags to pass in the KDBUS_ITEM flags field
* @name: The name that was removed or assigned to a new owner
*
* Returns 0 on success, or a negative error code.
*/
int kdbus_notify_name_change(struct kdbus_ep *ep, u64 type,
u64 old_id, u64 new_id, u64 flags,
const char *name)
{
struct kdbus_notify_name_change *name_change;
struct kdbus_kmsg *kmsg = NULL;
struct kdbus_item *item;
struct kdbus_msg *msg;
size_t extra_size;
int ret;
extra_size = sizeof(*name_change) + strlen(name);
ret = kdbus_kmsg_new(extra_size, &kmsg);
if (ret < 0)
return ret;
kmsg->notification_type = type;
msg = &kmsg->msg;
item = msg->items;
name_change = (struct kdbus_notify_name_change *)item->data;
msg->dst_id = KDBUS_DST_ID_BROADCAST;
msg->src_id = KDBUS_SRC_ID_KERNEL;
item->type = type;
name_change->old_id = old_id;
name_change->new_id = new_id;
name_change->flags = flags;
strcpy(name_change->name, name);
ret = kdbus_conn_kmsg_send(ep, NULL, kmsg);
kdbus_kmsg_free(kmsg);
return ret;
}
/**
* kdbus_notify_id_change - send a notification about a unique ID change
* @ep: The endpoint to use for sending
* @type: The type if the notification; KDBUS_MATCH_ID_ADD or
* KDBUS_MATCH_ID_REMOVE
* @id: The id of the connection that was added or removed
* @flags: The flags to pass in the KDBUS_ITEM flags field
*
* Returns 0 on success, or a negative error code.
*/
int kdbus_notify_id_change(struct kdbus_ep *ep, u64 type,
u64 id, u64 flags)
{
struct kdbus_notify_id_change *id_change;
struct kdbus_kmsg *kmsg = NULL;
struct kdbus_item *item;
struct kdbus_msg *msg;
int ret;
ret = kdbus_kmsg_new(sizeof(*id_change), &kmsg);
if (ret < 0)
return ret;
kmsg->notification_type = type;
msg = &kmsg->msg;
item = msg->items;
id_change = (struct kdbus_notify_id_change *)item->data;
msg->dst_id = KDBUS_DST_ID_BROADCAST;
msg->src_id = KDBUS_SRC_ID_KERNEL;
item->type = type;
id_change->id = id;
id_change->flags = flags;
ret = kdbus_conn_kmsg_send(ep, NULL, kmsg);
kdbus_kmsg_free(kmsg);
return ret;
}
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