285 lines
9.7 KiB
C
285 lines
9.7 KiB
C
/****************************************************************************
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* net/netlink/netlink.h
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*
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* Copyright (C) 2018-2019 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 <semaphore.h>
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#include <netpacket/netlink.h>
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#include "devif/devif.h"
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#include "socket/socket.h"
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#ifdef CONFIG_NET_NETLINK
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define NETLINK_NO_WAITER ((pid_t)-1)
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/****************************************************************************
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* Public Type Definitions
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****************************************************************************/
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/* Netlink uses a two step, request-get, referenced by a user managed
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* sequence number. This means that the requested data must be buffered
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* until it is gotten by the client. This structure holds that buffered
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* data.
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*
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* REVISIT: There really should be a time stamp on this so that we can
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* someday weed out un-claimed responses.
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*/
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struct netlink_response_s
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{
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sq_entry_t flink;
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FAR struct nlmsghdr msg;
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/* Message-specific data may follow */
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};
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#define SIZEOF_NETLINK_RESPONSE_S(n) (sizeof(struct netlink_response_s) + (n) - 1)
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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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/* This is a list of NetLink connection callbacks. Each callback
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* represents a thread that is stalled, waiting for a device-specific
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* event.
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*/
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FAR struct devif_callback_s *list; /* NetLink callbacks */
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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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uint8_t crefs; /* Reference counts on this instance */
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uint8_t protocol; /* See NETLINK_* definitions */
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/* Threads waiting for a response */
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pid_t waiter[CONFIG_NETLINK_MAXPENDING];
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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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* Public Function Prototypes
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****************************************************************************/
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struct sockaddr_nl; /* Forward reference */
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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 should
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* 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_active()
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*
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* Description:
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* Find a connection structure that is the appropriate connection for the
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* provided NetLink address
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*
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****************************************************************************/
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FAR struct netlink_conn_s *netlink_active(FAR struct sockaddr_nl *addr);
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/****************************************************************************
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* Name: netlink_add_response
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*
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* Description:
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* Add response data at the tail of the pending response list.
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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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****************************************************************************/
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void netlink_add_response(FAR struct socket *psock,
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FAR struct netlink_response_s *resp);
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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 socket *psock);
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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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* always returned. This function will block until a response is
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* received if the pending response list is empty.
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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 socket *psock);
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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(FAR struct socket *psock,
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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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#endif
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/****************************************************************************
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* Name: netlink_route_recvfrom()
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*
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* Description:
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* Perform the recvfrom() 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_recvfrom(FAR struct socket *psock,
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FAR struct nlmsghdr *nlmsg,
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size_t len, int flags,
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FAR struct sockaddr_nl *from);
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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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