f208c4bbd4
When a Netlink response is issued, which a task is currently polling for on the corresponding AF_NETLINK socket, then the poll call will return with a ENOENT error. This is due to the fact that the Netlink response notifier is automatically torn down after the notification. Fixed by making netlink_notifier_teardown a best-effort function that does not return a result code. Signed-off-by: Michael Jung <michael.jung@secore.ly>
289 lines
9.8 KiB
C
289 lines
9.8 KiB
C
/****************************************************************************
|
|
* net/netlink/netlink.h
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifndef __NET_NETLINK_NETLINK_H
|
|
#define __NET_NETLINK_NETLINK_H
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <sys/types.h>
|
|
#include <queue.h>
|
|
#include <poll.h>
|
|
|
|
#include <netpacket/netlink.h>
|
|
#include <nuttx/net/netlink.h>
|
|
#include <nuttx/semaphore.h>
|
|
#include <nuttx/wqueue.h>
|
|
|
|
#include "devif/devif.h"
|
|
#include "socket/socket.h"
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
#ifndef CONFIG_NETLINK_ROUTE
|
|
#define netlink_device_notify(dev)
|
|
#endif
|
|
|
|
#ifdef CONFIG_NET_NETLINK
|
|
|
|
/****************************************************************************
|
|
* Public Type Definitions
|
|
****************************************************************************/
|
|
|
|
/* This connection structure describes the underlying state of the socket. */
|
|
|
|
struct netlink_conn_s
|
|
{
|
|
/* Common prologue of all connection structures. */
|
|
|
|
struct socket_conn_s sconn;
|
|
|
|
/* NetLink-specific content follows */
|
|
|
|
uint32_t pid; /* Port ID (if bound) */
|
|
uint32_t groups; /* Multicast groups mask (if bound) */
|
|
uint32_t dst_pid; /* Destination port ID */
|
|
uint32_t dst_groups; /* Destination multicast groups mask */
|
|
uint8_t crefs; /* Reference counts on this instance */
|
|
uint8_t protocol; /* See NETLINK_* definitions */
|
|
|
|
/* poll() support */
|
|
|
|
int key; /* used to cancel notifications */
|
|
FAR sem_t *pollsem; /* Used to wakeup poll() */
|
|
FAR pollevent_t *pollevent; /* poll() wakeup event */
|
|
|
|
/* Queued response data */
|
|
|
|
sq_queue_t resplist; /* Singly linked list of responses */
|
|
};
|
|
|
|
/****************************************************************************
|
|
* Public Data
|
|
****************************************************************************/
|
|
|
|
#ifdef __cplusplus
|
|
# define EXTERN extern "C"
|
|
extern "C"
|
|
{
|
|
#else
|
|
# define EXTERN extern
|
|
#endif
|
|
|
|
EXTERN const struct sock_intf_s g_netlink_sockif;
|
|
|
|
/****************************************************************************
|
|
* Name: netlink_initialize()
|
|
*
|
|
* Description:
|
|
* Initialize the NetLink connection structures. Called once and only
|
|
* from the networking layer.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void netlink_initialize(void);
|
|
|
|
/****************************************************************************
|
|
* Name: netlink_alloc()
|
|
*
|
|
* Description:
|
|
* Allocate a new, uninitialized NetLink connection structure. This is
|
|
* normally something done by the implementation of the socket() API
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR struct netlink_conn_s *netlink_alloc(void);
|
|
|
|
/****************************************************************************
|
|
* Name: netlink_free()
|
|
*
|
|
* Description:
|
|
* Free a NetLink connection structure that is no longer in use. This
|
|
* should be done by the implementation of close().
|
|
*
|
|
****************************************************************************/
|
|
|
|
void netlink_free(FAR struct netlink_conn_s *conn);
|
|
|
|
/****************************************************************************
|
|
* Name: netlink_nextconn()
|
|
*
|
|
* Description:
|
|
* Traverse the list of allocated NetLink connections
|
|
*
|
|
* Assumptions:
|
|
* This function is called from NetLink device logic.
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR struct netlink_conn_s *netlink_nextconn(FAR struct netlink_conn_s *conn);
|
|
|
|
/****************************************************************************
|
|
* Name: netlink_notifier_setup
|
|
*
|
|
* Description:
|
|
* Set up to perform a callback to the worker function the Netlink
|
|
* response data is received. The worker function will execute on the low
|
|
* priority worker thread.
|
|
*
|
|
* Input Parameters:
|
|
* worker - The worker function to execute on the low priority work
|
|
* queue when Netlink response data is available.
|
|
* conn - The Netlink connection where the response is expected.
|
|
* arg - A user-defined argument that will be available to the worker
|
|
* function when it runs.
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) is returned if the notification was successfully set up.
|
|
* A negated error value is returned if an unexpected error occurred
|
|
* and no notification will occur.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int netlink_notifier_setup(worker_t worker, FAR struct netlink_conn_s *conn,
|
|
FAR void *arg);
|
|
|
|
/****************************************************************************
|
|
* Name: netlink_notifier_teardown
|
|
*
|
|
* Description:
|
|
* Eliminate a Netlink response notification previously setup by
|
|
* netlink_notifier_setup(). This function should only be called if the
|
|
* notification should be aborted prior to the notification. The
|
|
* notification will automatically be torn down after the notification.
|
|
*
|
|
* Input Parameters:
|
|
* conn - Teardown the notification for this Netlink connection.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void netlink_notifier_teardown(FAR struct netlink_conn_s *conn);
|
|
|
|
/****************************************************************************
|
|
* Name: netlink_notifier_signal
|
|
*
|
|
* Description:
|
|
* New Netlink response data is available. Execute worker thread
|
|
* functions for all threads that wait for response data.
|
|
*
|
|
* Input Parameters:
|
|
* conn - The Netlink connection where the response was just buffered.
|
|
*
|
|
* Returned Value:
|
|
* None.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void netlink_notifier_signal(FAR struct netlink_conn_s *conn);
|
|
|
|
/****************************************************************************
|
|
* Name: netlink_tryget_response
|
|
*
|
|
* Description:
|
|
* Return the next response from the head of the pending response list.
|
|
* Responses are returned one-at-a-time in FIFO order.
|
|
*
|
|
* Note: The network will be momentarily locked to support exclusive
|
|
* access to the pending response list.
|
|
*
|
|
* Returned Value:
|
|
* The next response from the head of the pending response list is
|
|
* returned. NULL will be returned if the pending response list is
|
|
* empty
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR struct netlink_response_s *
|
|
netlink_tryget_response(FAR struct netlink_conn_s *conn);
|
|
|
|
/****************************************************************************
|
|
* Name: netlink_get_response
|
|
*
|
|
* Description:
|
|
* Return the next response from the head of the pending response list.
|
|
* Responses are returned one-at-a-time in FIFO order.
|
|
*
|
|
* Note: The network will be momentarily locked to support exclusive
|
|
* access to the pending response list.
|
|
*
|
|
* Returned Value:
|
|
* The next response from the head of the pending response list is
|
|
* returned. This function will block until a response is received if
|
|
* the pending response list is empty. NULL will be returned only in the
|
|
* event of a failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR struct netlink_response_s *
|
|
netlink_get_response(FAR struct netlink_conn_s *conn);
|
|
|
|
/****************************************************************************
|
|
* Name: netlink_check_response
|
|
*
|
|
* Description:
|
|
* Return true is a response is pending now.
|
|
*
|
|
* Returned Value:
|
|
* True: A response is available; False; No response is available.
|
|
*
|
|
****************************************************************************/
|
|
|
|
bool netlink_check_response(FAR struct netlink_conn_s *conn);
|
|
|
|
/****************************************************************************
|
|
* Name: netlink_route_sendto()
|
|
*
|
|
* Description:
|
|
* Perform the sendto() operation for the NETLINK_ROUTE protocol.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NETLINK_ROUTE
|
|
ssize_t netlink_route_sendto(NETLINK_HANDLE handle,
|
|
FAR const struct nlmsghdr *nlmsg,
|
|
size_t len, int flags,
|
|
FAR const struct sockaddr_nl *to,
|
|
socklen_t tolen);
|
|
|
|
/****************************************************************************
|
|
* Name: netlink_device_notify()
|
|
*
|
|
* Description:
|
|
* Perform the route broadcast for the NETLINK_ROUTE protocol.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void netlink_device_notify(FAR struct net_driver_s *dev);
|
|
#endif
|
|
|
|
#undef EXTERN
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* CONFIG_NET_NETLINK */
|
|
#endif /* __NET_NETLINK_NETLINK_H */
|