307 lines
11 KiB
C
307 lines
11 KiB
C
/****************************************************************************
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* net/netlink/netlink.h
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*
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* Copyright (C) 2019 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __NET_NETLINK_NETLINK_H
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#define __NET_NETLINK_NETLINK_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <queue.h>
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#include <poll.h>
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#include <netpacket/netlink.h>
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#include <nuttx/net/netlink.h>
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#include <nuttx/semaphore.h>
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#include "devif/devif.h"
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#include "socket/socket.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifndef CONFIG_NETLINK_ROUTE
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#define netlink_device_notify(dev)
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#endif
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#ifdef CONFIG_NET_NETLINK
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/****************************************************************************
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* Public Type Definitions
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****************************************************************************/
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/* This connection structure describes the underlying state of the socket. */
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struct netlink_conn_s
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{
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/* Common prologue of all connection structures. */
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dq_entry_t node; /* Supports a doubly linked list */
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/* NetLink-specific content follows */
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uint32_t pid; /* Port ID (if bound) */
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uint32_t groups; /* Multicast groups mask (if bound) */
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uint32_t dst_pid; /* Destination port ID */
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uint32_t dst_groups; /* Destination multicast groups mask */
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uint8_t crefs; /* Reference counts on this instance */
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uint8_t protocol; /* See NETLINK_* definitions */
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/* poll() support */
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int key; /* used to cancel notifications */
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FAR sem_t *pollsem; /* Used to wakeup poll() */
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FAR pollevent_t *pollevent; /* poll() wakeup event */
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/* Queued response data */
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sq_queue_t resplist; /* Singly linked list of responses */
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifdef __cplusplus
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# define EXTERN extern "C"
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extern "C"
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{
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#else
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# define EXTERN extern
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#endif
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EXTERN const struct sock_intf_s g_netlink_sockif;
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/****************************************************************************
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* Name: netlink_initialize()
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*
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* Description:
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* Initialize the NetLink connection structures. Called once and only
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* from the networking layer.
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*
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****************************************************************************/
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void netlink_initialize(void);
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/****************************************************************************
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* Name: netlink_alloc()
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*
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* Description:
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* Allocate a new, uninitialized NetLink connection structure. This is
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* normally something done by the implementation of the socket() API
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*
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****************************************************************************/
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FAR struct netlink_conn_s *netlink_alloc(void);
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/****************************************************************************
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* Name: netlink_free()
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*
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* Description:
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* Free a NetLink connection structure that is no longer in use. This
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* should be done by the implementation of close().
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*
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****************************************************************************/
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void netlink_free(FAR struct netlink_conn_s *conn);
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/****************************************************************************
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* Name: netlink_nextconn()
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*
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* Description:
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* Traverse the list of allocated NetLink connections
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*
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* Assumptions:
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* This function is called from NetLink device logic.
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*
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****************************************************************************/
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FAR struct netlink_conn_s *netlink_nextconn(FAR struct netlink_conn_s *conn);
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/****************************************************************************
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* Name: netlink_notifier_setup
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*
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* Description:
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* Set up to perform a callback to the worker function the Netlink
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* response data is received. The worker function will execute on the low
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* priority worker thread.
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*
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* Input Parameters:
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* worker - The worker function to execute on the low priority work
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* queue when Netlink response data is available.
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* conn - The Netlink connection where the response is expected.
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* arg - A user-defined argument that will be available to the worker
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* function when it runs.
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*
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* Returned Value:
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* Zero (OK) is returned if the notification was successfully set up.
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* A negated error value is returned if an unexpected error occurred
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* and no notification will occur.
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*
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****************************************************************************/
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int netlink_notifier_setup(worker_t worker, FAR struct netlink_conn_s *conn,
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FAR void *arg);
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/****************************************************************************
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* Name: netlink_notifier_teardown
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*
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* Description:
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* Eliminate a Netlink response notification previously setup by
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* netlink_notifier_setup(). This function should only be called if the
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* notification should be aborted prior to the notification. The
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* notification will automatically be torn down after the notification.
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*
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* Input Parameters:
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* conn - Teardown the notification for this Netlink connection.
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*
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* Returned Value:
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* Zero (OK) is returned on success; a negated errno value is returned on
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* any failure.
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*
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****************************************************************************/
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int netlink_notifier_teardown(FAR struct netlink_conn_s *conn);
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/****************************************************************************
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* Name: netlink_notifier_signal
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*
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* Description:
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* New Netlink response data is available. Execute worker thread
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* functions for all threads that wait for response data.
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*
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* Input Parameters:
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* conn - The Netlink connection where the response was just buffered.
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*
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* Returned Value:
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* None.
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*
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****************************************************************************/
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void netlink_notifier_signal(FAR struct netlink_conn_s *conn);
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/****************************************************************************
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* Name: netlink_tryget_response
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*
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* Description:
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* Return the next response from the head of the pending response list.
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* Responses are returned one-at-a-time in FIFO order.
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*
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* Note: The network will be momentarily locked to support exclusive
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* access to the pending response list.
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*
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* Returned Value:
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* The next response from the head of the pending response list is
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* returned. NULL will be returned if the pending response list is
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* empty
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*
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****************************************************************************/
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FAR struct netlink_response_s *
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netlink_tryget_response(FAR struct netlink_conn_s *conn);
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/****************************************************************************
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* Name: netlink_get_response
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*
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* Description:
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* Return the next response from the head of the pending response list.
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* Responses are returned one-at-a-time in FIFO order.
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*
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* Note: The network will be momentarily locked to support exclusive
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* access to the pending response list.
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*
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* Returned Value:
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* The next response from the head of the pending response list is
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* returned. This function will block until a response is received if
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* the pending response list is empty. NULL will be returned only in the
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* event of a failure.
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*
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****************************************************************************/
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FAR struct netlink_response_s *
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netlink_get_response(FAR struct netlink_conn_s *conn);
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/****************************************************************************
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* Name: netlink_check_response
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*
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* Description:
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* Return true is a response is pending now.
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*
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* Returned Value:
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* True: A response is available; False; No response is available.
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*
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****************************************************************************/
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bool netlink_check_response(FAR struct netlink_conn_s *conn);
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/****************************************************************************
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* Name: netlink_route_sendto()
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*
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* Description:
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* Perform the sendto() operation for the NETLINK_ROUTE protocol.
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*
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****************************************************************************/
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#ifdef CONFIG_NETLINK_ROUTE
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ssize_t netlink_route_sendto(NETLINK_HANDLE handle,
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FAR const struct nlmsghdr *nlmsg,
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size_t len, int flags,
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FAR const struct sockaddr_nl *to,
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socklen_t tolen);
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/****************************************************************************
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* Name: netlink_device_notify()
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*
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* Description:
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* Perform the route broadcast for the NETLINK_ROUTE protocol.
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*
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****************************************************************************/
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void netlink_device_notify(FAR struct net_driver_s *dev);
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#endif
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* CONFIG_NET_NETLINK */
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#endif /* __NET_NETLINK_NETLINK_H */
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