93ed8b66d9
So although the poll() implemenation is still not yet usable, the commit is useful because it (1) does not harm, and (2) incidentally fixes a few other issues in the NETLONK response queuing that I noted in the process.
820 lines
26 KiB
C
820 lines
26 KiB
C
/****************************************************************************
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* net/netlink/netlink_sockif.c
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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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/****************************************************************************
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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 <sys/socket.h>
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#include <stdbool.h>
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#include <string.h>
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#include <poll.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/net/net.h>
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#include "netlink/netlink.h"
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#ifdef CONFIG_NET_NETLINK
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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static int netlink_setup(FAR struct socket *psock, int protocol);
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static sockcaps_t netlink_sockcaps(FAR struct socket *psock);
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static void netlink_addref(FAR struct socket *psock);
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static int netlink_bind(FAR struct socket *psock,
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FAR const struct sockaddr *addr, socklen_t addrlen);
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static int netlink_getsockname(FAR struct socket *psock,
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FAR struct sockaddr *addr, FAR socklen_t *addrlen);
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static int netlink_getpeername(FAR struct socket *psock,
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FAR struct sockaddr *addr, FAR socklen_t *addrlen);
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static int netlink_listen(FAR struct socket *psock, int backlog);
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static int netlink_connect(FAR struct socket *psock,
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FAR const struct sockaddr *addr, socklen_t addrlen);
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static int netlink_accept(FAR struct socket *psock, FAR struct sockaddr *addr,
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FAR socklen_t *addrlen, FAR struct socket *newsock);
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static int netlink_poll(FAR struct socket *psock, FAR struct pollfd *fds,
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bool setup);
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static ssize_t netlink_send(FAR struct socket *psock,
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FAR const void *buf, size_t len, int flags);
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static ssize_t netlink_sendto(FAR struct socket *psock, FAR const void *buf,
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size_t len, int flags, FAR const struct sockaddr *to,
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socklen_t tolen);
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static ssize_t netlink_recvfrom(FAR struct socket *psock, FAR void *buf,
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size_t len, int flags, FAR struct sockaddr *from,
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FAR socklen_t *fromlen);
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static int netlink_close(FAR struct socket *psock);
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/****************************************************************************
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* Public Data
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****************************************************************************/
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const struct sock_intf_s g_netlink_sockif =
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{
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netlink_setup, /* si_setup */
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netlink_sockcaps, /* si_sockcaps */
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netlink_addref, /* si_addref */
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netlink_bind, /* si_bind */
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netlink_getsockname, /* si_getsockname */
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netlink_getpeername, /* si_getpeername */
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netlink_listen, /* si_listen */
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netlink_connect, /* si_connect */
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netlink_accept, /* si_accept */
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netlink_poll, /* si_poll */
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netlink_send, /* si_send */
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netlink_sendto, /* si_sendto */
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#ifdef CONFIG_NET_SENDFILE
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NULL, /* si_sendfile */
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#endif
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netlink_recvfrom, /* si_recvfrom */
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netlink_close /* si_close */
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: inet_setup
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*
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* Description:
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* Called for socket() to verify that the provided socket type and
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* protocol are usable by this address family. Perform any family-
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* specific socket fields.
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*
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* Input Parameters:
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* psock - A pointer to a user allocated socket structure to be
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* initialized.
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* protocol - NetLink socket protocol (see sys/socket.h)
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*
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* Returned Value:
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* Zero (OK) is returned on success. Otherwise, a negated errno value is
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* returned.
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*
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****************************************************************************/
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static int netlink_setup(FAR struct socket *psock, int protocol)
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{
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int domain = psock->s_domain;
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int type = psock->s_type;
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/* Verify that the protocol is supported */
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DEBUGASSERT((unsigned int)protocol <= UINT8_MAX);
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switch (protocol)
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{
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#ifdef CONFIG_NETLINK_ROUTE
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case NETLINK_ROUTE:
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break;
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#endif
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default:
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return -EPROTONOSUPPORT;
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}
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/* Verify the socket type (domain should always be PF_NETLINK here) */
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if (domain == PF_NETLINK && (type == SOCK_RAW || type == SOCK_DGRAM))
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{
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/* Allocate the NetLink socket connection structure and save it in the
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* new socket instance.
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*/
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FAR struct netlink_conn_s *conn = netlink_alloc();
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if (conn == NULL)
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{
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/* Failed to reserve a connection structure */
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return -ENOMEM;
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}
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/* Initialize the connection instance */
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conn->protocol = (uint8_t)protocol;
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/* Set the reference count on the connection structure. This
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* reference count will be incremented only if the socket is
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* dup'ed
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*/
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conn->crefs = 1;
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/* Attach the connection instance to the socket */
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psock->s_conn = conn;
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return OK;
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}
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return -EPROTONOSUPPORT;
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}
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/****************************************************************************
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* Name: netlink_sockcaps
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*
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* Description:
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* Return the bit encoded capabilities of this socket.
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*
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* Input Parameters:
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* psock - Socket structure of the socket whose capabilities are being
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* queried.
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*
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* Returned Value:
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* The non-negative set of socket capabilities is returned.
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*
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****************************************************************************/
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static sockcaps_t netlink_sockcaps(FAR struct socket *psock)
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{
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/* Permit vfcntl to set socket to non-blocking */
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return SOCKCAP_NONBLOCKING;
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}
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/****************************************************************************
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* Name: netlink_addref
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*
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* Description:
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* Increment the reference count on the underlying connection structure.
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*
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* Input Parameters:
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* psock - Socket structure of the socket whose reference count will be
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* incremented.
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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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static void netlink_addref(FAR struct socket *psock)
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{
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FAR struct netlink_conn_s *conn;
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DEBUGASSERT(psock != NULL && psock->s_conn != NULL);
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conn = psock->s_conn;
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DEBUGASSERT(conn->crefs > 0 && conn->crefs < 255);
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conn->crefs++;
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}
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/****************************************************************************
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* Name: netlink_bind
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*
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* Description:
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* netlink_bind() gives the socket 'conn' the local address 'addr'. 'addr'
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* is 'addrlen' bytes long. Traditionally, this is called "assigning a name
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* to a socket." When a socket is created with socket, it exists in a name
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* space (address family) but has no name assigned.
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*
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* Input Parameters:
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* conn NetLink socket connection structure
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* addr Socket local address
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* addrlen Length of 'addr'
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*
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* Returned Value:
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* 0 on success; -1 on error with errno set appropriately
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*
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* EACCES
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* The address is protected, and the user is not the superuser.
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* EADDRINUSE
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* The given address is already in use.
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* EINVAL
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* The socket is already bound to an address.
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* ENOTSOCK
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* psock is a descriptor for a file, not a socket.
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*
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* Assumptions:
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*
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****************************************************************************/
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static int netlink_bind(FAR struct socket *psock,
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FAR const struct sockaddr *addr, socklen_t addrlen)
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{
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FAR struct sockaddr_nl *nladdr;
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FAR struct netlink_conn_s *conn;
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DEBUGASSERT(psock != NULL && psock->s_conn != NULL && addr != NULL &&
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addrlen >= sizeof(struct sockaddr_nl));
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/* Save the address information in the connection structure */
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nladdr = (FAR struct sockaddr_nl *)addr;
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conn = (FAR struct netlink_conn_s *)psock->s_conn;
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conn->pid = nladdr->nl_pid;
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conn->groups = nladdr->nl_groups;
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psock->s_flags |= _SF_BOUND;
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return OK;
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}
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/****************************************************************************
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* Name: netlink_getsockname
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*
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* Description:
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* The getsockname() function retrieves the locally-bound name of the
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* specified socket, stores this address in the sockaddr structure pointed
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* to by the 'addr' argument, and stores the length of this address in the
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* object pointed to by the 'addrlen' argument.
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*
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* If the actual length of the address is greater than the length of the
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* supplied sockaddr structure, the stored address will be truncated.
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*
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* If the socket has not been bound to a local name, the value stored in
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* the object pointed to by address is unspecified.
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*
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* Input Parameters:
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* conn NetLink socket connection structure
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* addr sockaddr structure to receive data [out]
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* addrlen Length of sockaddr structure [in/out]
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*
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****************************************************************************/
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static int netlink_getsockname(FAR struct socket *psock,
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FAR struct sockaddr *addr,
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FAR socklen_t *addrlen)
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{
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FAR struct sockaddr_nl *nladdr;
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DEBUGASSERT(psock != NULL && psock->s_conn != NULL && addr != NULL &&
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addrlen != NULL && *addrlen >= sizeof(struct sockaddr_nl));
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/* Return the address information in the address structure */
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nladdr = (FAR struct sockaddr_nl *)addr;
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memset(nladdr, 0, sizeof(struct sockaddr_nl));
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nladdr->nl_family = AF_NETLINK;
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if (_SS_ISBOUND(psock->s_flags))
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{
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FAR struct netlink_conn_s *conn;
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conn = (FAR struct netlink_conn_s *)psock->s_conn;
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nladdr->nl_pid = conn->pid;
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nladdr->nl_groups = conn->groups;
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}
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*addrlen = sizeof(struct sockaddr_nl);
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return OK;
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}
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/****************************************************************************
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* Name: netlink_getpeername
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*
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* Description:
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* The netlink_getpeername() function retrieves the remote-connected name
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* of the specified packet socket, stores this address in the sockaddr
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* structure pointed to by the 'addr' argument, and stores the length of
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* this address in the object pointed to by the 'addrlen' argument.
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*
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* If the actual length of the address is greater than the length of the
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* supplied sockaddr structure, the stored address will be truncated.
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*
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* If the socket has not been bound to a local name, the value stored in
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* the object pointed to by address is unspecified.
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*
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* Parameters:
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* psock Socket structure of the socket to be queried
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* addr sockaddr structure to receive data [out]
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* addrlen Length of sockaddr structure [in/out]
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*
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* Returned Value:
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* On success, 0 is returned, the 'addr' argument points to the address
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* of the socket, and the 'addrlen' argument points to the length of the
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* address. Otherwise, a negated errno value is returned. See
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* getpeername() for the list of appropriate error numbers.
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*
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****************************************************************************/
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static int netlink_getpeername(FAR struct socket *psock,
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FAR struct sockaddr *addr,
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FAR socklen_t *addrlen)
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{
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#warning Missing logic for NETLINK getsockname
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return -EOPNOTSUPP; /* Or maybe return -EAFNOSUPPORT; */
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}
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/****************************************************************************
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* Name: netlink_listen
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*
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* Description:
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* To accept connections, a socket is first created with psock_socket(), a
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* willingness to accept incoming connections and a queue limit for
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* incoming connections are specified with psock_listen(), and then the
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* connections are accepted with psock_accept(). For the case of AFINET
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* and AFINET6 sockets, psock_listen() calls this function. The
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* psock_listen() call applies only to sockets of type SOCK_STREAM or
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* SOCK_SEQPACKET.
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*
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* Input Parameters:
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* psock Reference to an internal, bound socket structure.
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* backlog The maximum length the queue of pending connections may grow.
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* If a connection request arrives with the queue full, the client
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* may receive an error with an indication of ECONNREFUSED or,
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* if the underlying protocol supports retransmission, the request
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* may be ignored so that retries succeed.
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*
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* Returned Value:
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* On success, zero is returned. On error, a negated errno value is
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* returned. See list() for the set of appropriate error values.
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*
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****************************************************************************/
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static int netlink_listen(FAR struct socket *psock, int backlog)
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{
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#warning Missing logic for NETLINK listen
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return -EOPNOTSUPP;
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}
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/****************************************************************************
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* Name: netlink_connect
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*
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* Description:
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* Perform a netlink connection
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*
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* Input Parameters:
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* psock A reference to the socket structure of the socket to be connected
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* addr The address of the remote server to connect to
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* addrlen Length of address buffer
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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*
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****************************************************************************/
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static int netlink_connect(FAR struct socket *psock,
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FAR const struct sockaddr *addr,
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socklen_t addrlen)
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{
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#warning Missing logic for NETLINK connect
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return -EOPNOTSUPP;
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}
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/****************************************************************************
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* Name: netlink_accept
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*
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* Description:
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* The netlink_accept function is used with connection-based socket
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* types (SOCK_STREAM, SOCK_SEQPACKET and SOCK_RDM). It extracts the first
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* connection request on the queue of pending connections, creates a new
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* connected socket with mostly the same properties as 'sockfd', and
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* allocates a new socket descriptor for the socket, which is returned. The
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* newly created socket is no longer in the listening state. The original
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* socket 'sockfd' is unaffected by this call. Per file descriptor flags
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* are not inherited across an inet_accept.
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*
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* The 'sockfd' argument is a socket descriptor that has been created with
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* socket(), bound to a local address with bind(), and is listening for
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* connections after a call to listen().
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*
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* On return, the 'addr' structure is filled in with the address of the
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* connecting entity. The 'addrlen' argument initially contains the size
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* of the structure pointed to by 'addr'; on return it will contain the
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* actual length of the address returned.
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*
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* If no pending connections are present on the queue, and the socket is
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* not marked as non-blocking, inet_accept blocks the caller until a
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* connection is present. If the socket is marked non-blocking and no
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* pending connections are present on the queue, inet_accept returns
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* EAGAIN.
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*
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* Input Parameters:
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* psock Reference to the listening socket structure
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* addr Receives the address of the connecting client
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* addrlen Input: Allocated size of 'addr'
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* Return: Actual size returned size of 'addr'
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* newsock Location to return the accepted socket information.
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*
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* Returned Value:
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* Returns 0 (OK) on success. On failure, it returns a negated errno
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* value. See accept() for a description of the appropriate error value.
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*
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* Assumptions:
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* The network is locked.
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*
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****************************************************************************/
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static int netlink_accept(FAR struct socket *psock, FAR struct sockaddr *addr,
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FAR socklen_t *addrlen, FAR struct socket *newsock)
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{
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#warning Missing logic for NETLINK accept
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return -EOPNOTSUPP;
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}
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|
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/****************************************************************************
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* Name: netlink_poll
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*
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* Description:
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* The standard poll() operation redirects operations on socket descriptors
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* to this function.
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*
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* POLLUP: Will never be reported
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* POLLERR: Reported in the event of any failure.
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* POLLOUT: Always reported if requested.
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* POLLIN: Reported if requested but only when pending response data is
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* available
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*
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* Input Parameters:
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* psock - An instance of the internal socket structure.
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* fds - The structure describing the events to be monitored.
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* setup - true: Setup up the poll; false: Tear down the poll
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*
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* Returned Value:
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* 0: Success; Negated errno on failure
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*
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****************************************************************************/
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static int netlink_poll(FAR struct socket *psock, FAR struct pollfd *fds,
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bool setup)
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{
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int ret;
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/* Check if we are setting up or tearing down the poll */
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if (setup)
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{
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/* If POLLOUT is selected, return immediately (maybe) */
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pollevent_t revents = POLLOUT;
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/* If POLLIN is selected and a response is available, return
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* immediately (maybe).
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*/
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net_lock();
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if (netlink_check_response(psock))
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{
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revents |= POLLIN;
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}
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|
|
|
/* But return ONLY if POLLIN and/or POLLIN are included in the
|
|
* requested event set.
|
|
*/
|
|
|
|
revents &= fds->events;
|
|
if (revents != 0)
|
|
{
|
|
fds->revents = revents;
|
|
nxsem_post(fds->sem);
|
|
net_unlock();
|
|
return OK;
|
|
}
|
|
|
|
/* Set up to be notified by signal when a response is available if
|
|
* POLLIN is requested.
|
|
*/
|
|
|
|
if ((fds->events & POLLIN) != 0)
|
|
{
|
|
#if 0
|
|
/* Call netlink_notify_response() to receive a signal when
|
|
* a response has been queued.
|
|
*
|
|
* REVISIT: How shall we pass the FDS info to the signal
|
|
* handler?
|
|
*/
|
|
|
|
#else
|
|
#warning Missing logic for NETLINK POLLIN
|
|
nxsem_post(fds->sem);
|
|
net_unlock();
|
|
return -ENOSYS;
|
|
#endif
|
|
}
|
|
|
|
/* There will not be any wakeups coming? Probably an error? */
|
|
|
|
net_unlock();
|
|
ret = OK;
|
|
}
|
|
else
|
|
{
|
|
/* Cancel any response notifications */
|
|
|
|
ret = netlink_notify_cancel(psock);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: netlink_send
|
|
*
|
|
* Description:
|
|
* The netlink_send() call may be used only when the socket is in
|
|
* a connected state (so that the intended recipient is known).
|
|
*
|
|
* Input Parameters:
|
|
* psock - An instance of the internal socket structure.
|
|
* buf - Data to send
|
|
* len - Length of data to send
|
|
* flags - Send flags (ignored)
|
|
*
|
|
* Returned Value:
|
|
* On success, returns the number of characters sent. On error, a negated
|
|
* errno value is returned (see send() for the list of appropriate error
|
|
* values.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static ssize_t netlink_send(FAR struct socket *psock, FAR const void *buf,
|
|
size_t len, int flags)
|
|
{
|
|
DEBUGASSERT(psock != NULL && psock->s_conn != NULL && buf != NULL);
|
|
|
|
/* The socket must be connected in order to use send */
|
|
|
|
if (_SS_ISBOUND(psock->s_flags))
|
|
{
|
|
FAR struct netlink_conn_s *conn;
|
|
struct sockaddr_nl nladdr;
|
|
|
|
/* Get the underlying connection structure */
|
|
|
|
conn = (FAR struct netlink_conn_s *)psock->s_conn;
|
|
|
|
/* Format the address */
|
|
|
|
nladdr.nl_family = AF_NETLINK;
|
|
nladdr.nl_pad = 0;
|
|
nladdr.nl_pid = conn->pid;
|
|
nladdr.nl_groups = conn->groups;
|
|
|
|
/* Then let sendto() perform the actual send operation */
|
|
|
|
return netlink_sendto(psock, buf, len, flags,
|
|
(FAR const struct sockaddr *)&nladdr,
|
|
sizeof(struct sockaddr_nl));
|
|
}
|
|
|
|
/* EDESTADDRREQ. Signifies that the socket is not connection-mode and no
|
|
* peer address is set.
|
|
*/
|
|
|
|
return -EDESTADDRREQ;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: netlink_sendto
|
|
*
|
|
* Description:
|
|
* If sendto() is used on a connection-mode (SOCK_STREAM, SOCK_SEQPACKET)
|
|
* socket, the parameters to and 'tolen' are ignored (and the error EISCONN
|
|
* may be returned when they are not NULL and 0), and the error ENOTCONN is
|
|
* returned when the socket was not actually connected.
|
|
*
|
|
* Input Parameters:
|
|
* psock A reference to the socket structure of the socket to be connected
|
|
* buf Data to send
|
|
* len Length of data to send
|
|
* flags Send flags (ignored)
|
|
* to Address of recipient
|
|
* tolen The length of the address structure
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
*
|
|
****************************************************************************/
|
|
|
|
static ssize_t netlink_sendto(FAR struct socket *psock, FAR const void *buf,
|
|
size_t len, int flags,
|
|
FAR const struct sockaddr *to, socklen_t tolen)
|
|
{
|
|
FAR struct netlink_conn_s *conn;
|
|
FAR struct nlmsghdr *nlmsg;
|
|
int ret;
|
|
|
|
DEBUGASSERT(psock != NULL && psock->s_conn != NULL && buf != NULL &&
|
|
to != NULL && tolen >= sizeof(struct sockaddr_nl));
|
|
|
|
conn = (FAR struct netlink_conn_s *)psock->s_conn;
|
|
|
|
/* Get a reference to the netlink message */
|
|
|
|
nlmsg = (FAR struct nlmsghdr *)buf;
|
|
DEBUGASSERT(nlmsg->nlmsg_len >= sizeof(struct nlmsghdr));
|
|
|
|
switch (conn->protocol)
|
|
{
|
|
#ifdef CONFIG_NETLINK_ROUTE
|
|
case NETLINK_ROUTE:
|
|
ret = netlink_route_sendto(psock, nlmsg, len, flags,
|
|
(FAR struct sockaddr_nl *)to,
|
|
tolen);
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
ret= -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: netlink_recvfrom
|
|
*
|
|
* Description:
|
|
* recvfrom() receives messages from a socket, and may be used to receive
|
|
* data on a socket whether or not it is connection-oriented.
|
|
*
|
|
* If from is not NULL, and the underlying protocol provides the source
|
|
* address, this source address is filled in. The argument 'fromlen'
|
|
* initialized to the size of the buffer associated with from, and modified
|
|
* on return to indicate the actual size of the address stored there.
|
|
*
|
|
* Input Parameters:
|
|
* psock A pointer to a NuttX-specific, internal socket structure
|
|
* buf Buffer to receive data
|
|
* len Length of buffer
|
|
* flags Receive flags (ignored)
|
|
* from Address of source (may be NULL)
|
|
* fromlen The length of the address structure
|
|
*
|
|
****************************************************************************/
|
|
|
|
static ssize_t netlink_recvfrom(FAR struct socket *psock, FAR void *buf,
|
|
size_t len, int flags,
|
|
FAR struct sockaddr *from,
|
|
FAR socklen_t *fromlen)
|
|
{
|
|
FAR struct netlink_conn_s *conn;
|
|
FAR struct nlmsghdr *nlmsg;
|
|
int ret;
|
|
|
|
DEBUGASSERT(psock != NULL && psock->s_conn != NULL && buf != NULL);
|
|
DEBUGASSERT(from == NULL ||
|
|
(fromlen != NULL && *fromlen >= sizeof(struct sockaddr_nl)));
|
|
|
|
conn = (FAR struct netlink_conn_s *)psock->s_conn;
|
|
|
|
/* Get a reference to the NetLink message */
|
|
|
|
nlmsg = (FAR struct nlmsghdr *)buf;
|
|
|
|
switch (conn->protocol)
|
|
{
|
|
#ifdef CONFIG_NETLINK_ROUTE
|
|
case NETLINK_ROUTE:
|
|
ret = netlink_route_recvfrom(psock, nlmsg, len, flags,
|
|
(FAR struct sockaddr_nl *)from);
|
|
if (ret >= 0 && fromlen != NULL)
|
|
{
|
|
*fromlen = sizeof(struct sockaddr_nl);
|
|
}
|
|
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
ret= -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: netlink_close
|
|
*
|
|
* Description:
|
|
* Performs the close operation on a NetLink socket instance
|
|
*
|
|
* Input Parameters:
|
|
* psock Socket instance
|
|
*
|
|
* Returned Value:
|
|
* 0 on success; -1 on error with errno set appropriately.
|
|
*
|
|
* Assumptions:
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int netlink_close(FAR struct socket *psock)
|
|
{
|
|
FAR struct netlink_conn_s *conn = psock->s_conn;
|
|
int ret = OK;
|
|
|
|
/* Perform some pre-close operations for the NETLINK socket type. */
|
|
|
|
/* Is this the last reference to the connection structure (there
|
|
* could be more if the socket was dup'ed).
|
|
*/
|
|
|
|
if (conn->crefs <= 1)
|
|
{
|
|
/* Yes... inform user-space daemon of socket close. */
|
|
|
|
#warning Missing logic in NETLINK close()
|
|
|
|
/* Free the connection structure */
|
|
|
|
conn->crefs = 0;
|
|
netlink_free(psock->s_conn);
|
|
|
|
if (ret < 0)
|
|
{
|
|
/* Return with error code, but free resources. */
|
|
|
|
nerr("ERROR: netlink_close failed: %d\n", ret);
|
|
return ret;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* No.. Just decrement the reference count */
|
|
|
|
conn->crefs--;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#endif /* CONFIG_NET_NETLINK */
|