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https://github.com/apache/nuttx.git
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guoshichaoandGUIDINGLI
57637e5927
To ensure consistency, in all places where the "sendmsg" function is used either directly or indirectly, the type of the "struct msghdr *msg" parameter needs to be modified to "const struct msghdr *msg". Signed-off-by: guoshichao <guoshichao@xiaomi.com>
473 lines
16 KiB
C
473 lines
16 KiB
C
/****************************************************************************
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* net/pkt/pkt.h
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __NET_PKT_PKT_H
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#define __NET_PKT_PKT_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 <nuttx/net/net.h>
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#ifdef CONFIG_NET_PKT
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Allocate a new packet socket data callback */
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#define pkt_callback_alloc(dev,conn) \
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devif_callback_alloc(dev, &conn->sconn.list, &conn->sconn.list_tail)
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#define pkt_callback_free(dev,conn,cb) \
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devif_conn_callback_free(dev, cb, &conn->sconn.list, &conn->sconn.list_tail)
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/****************************************************************************
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* Public Type Definitions
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****************************************************************************/
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/* Representation of a packet socket connection */
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struct devif_callback_s; /* Forward reference */
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struct pollfd; /* Forward reference */
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/* This is a container that holds the poll-related information */
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struct pkt_poll_s
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{
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FAR struct pkt_conn_s *conn; /* Needed to handle loss of connection */
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FAR struct pollfd *fds; /* Needed to handle poll events */
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FAR struct devif_callback_s *cb; /* Needed to teardown the poll */
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};
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struct pkt_conn_s
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{
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/* Common prologue of all connection structures. */
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struct socket_conn_s sconn;
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/* Pkt socket-specific content follows */
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uint8_t ifindex;
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uint8_t crefs; /* Reference counts on this instance */
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uint16_t type; /* The Ethernet type of the packet */
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#ifdef CONFIG_NET_PKT_WRITE_BUFFERS
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/* Write buffering
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*
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* write_q - The queue of unsent I/O buffers. The head of this
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* list may be partially sent. FIFO ordering.
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*/
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struct iob_queue_s write_q; /* Write buffering for pkt messages */
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/* Callback instance for pkt send */
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FAR struct devif_callback_s *sndcb;
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# if CONFIG_NET_SEND_BUFSIZE > 0
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int32_t sndbufs; /* Maximum amount of bytes queued in send */
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# endif
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sem_t sndsem; /* Semaphore signals send completion */
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#endif
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/* Read-ahead buffering.
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*
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* readahead - A singly linked list of type struct iob_qentry_s
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* where the PKT read-ahead data is retained.
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*
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* TODO: Maybe support PACKET_MMAP for further optimize.
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*/
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struct iob_queue_s readahead; /* Read-ahead buffering */
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FAR struct iob_s *pendiob; /* The iob currently being sent */
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/* The following is a list of poll structures of threads waiting for
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* socket events.
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*/
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struct pkt_poll_s pollinfo[CONFIG_NET_PKT_NPOLLWAITERS];
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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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/* The packet socket interface */
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EXTERN const struct sock_intf_s g_pkt_sockif;
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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struct net_driver_s; /* Forward reference */
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struct socket; /* Forward reference */
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/****************************************************************************
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* Name: pkt_alloc()
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*
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* Description:
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* Allocate a new, uninitialized packet socket connection structure. This
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* is normally something done by the implementation of the socket() API
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*
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****************************************************************************/
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FAR struct pkt_conn_s *pkt_alloc(void);
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/****************************************************************************
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* Name: pkt_free()
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*
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* Description:
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* Free a packet socket connection structure that is no longer in use.
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* This should be done by the implementation of close().
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*
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****************************************************************************/
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void pkt_free(FAR struct pkt_conn_s *conn);
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/****************************************************************************
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* Name: pkt_active()
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*
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* Description:
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* Find a connection structure that is the appropriate connection to be
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* used with the provided network device
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*
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* Assumptions:
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* This function is called from network logic at with the network locked.
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*
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****************************************************************************/
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FAR struct pkt_conn_s *pkt_active(FAR struct net_driver_s *dev);
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/****************************************************************************
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* Name: pkt_nextconn()
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*
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* Description:
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* Traverse the list of allocated packet connections
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*
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* Assumptions:
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* This function is called from network logic at with the network locked.
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*
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****************************************************************************/
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FAR struct pkt_conn_s *pkt_nextconn(FAR struct pkt_conn_s *conn);
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/****************************************************************************
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* Name: pkt_sendmsg_is_valid
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*
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* Description:
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* Validate the sendmsg() parameters for a packet socket.
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*
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* Input Parameters:
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* psock - The socket structure to validate
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* msg - The message header containing the data to be sent
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* dev - The network device to be used to send the packet
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int pkt_sendmsg_is_valid(FAR struct socket *psock,
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FAR const struct msghdr *msg,
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FAR struct net_driver_s **dev);
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/****************************************************************************
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* Name: pkt_conn_list_lock()
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*
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* Description:
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* Lock the packet connection list
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*
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* Assumptions:
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* This function must be called by driver thread.
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*
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****************************************************************************/
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void pkt_conn_list_lock(void);
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/****************************************************************************
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* Name: pkt_conn_list_unlock()
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*
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* Description:
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* Unlock the packet connection list
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*
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* Assumptions:
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* This function must be called by driver thread.
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*
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****************************************************************************/
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void pkt_conn_list_unlock(void);
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/****************************************************************************
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* Name: pkt_callback
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*
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* Description:
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* Inform the application holding the packet socket of a change in state.
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*
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* Returned Value:
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* OK if packet has been processed, otherwise ERROR.
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*
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* Assumptions:
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* This function is called from network logic at with the network locked.
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*
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****************************************************************************/
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uint32_t pkt_callback(FAR struct net_driver_s *dev,
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FAR struct pkt_conn_s *conn, uint32_t flags);
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/****************************************************************************
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* Name: pkt_input
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*
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* Description:
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* Handle incoming packet input
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*
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* This function provides the interface between Ethernet device drivers and
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* packet socket logic. All frames that are received should be provided to
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* pkt_input() prior to other routing.
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*
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* Input Parameters:
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* dev - The device driver structure containing the received packet
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*
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* Returned Value:
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* OK The packet has been processed and can be deleted
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* ERROR There is a matching connection, but could not dispatch the packet
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* yet. Useful when a packet arrives before a recv call is in
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* place.
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*
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* Assumptions:
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* Called from the network diver with the network locked.
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*
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****************************************************************************/
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/* pkt_input() is prototyped in include/nuttx/net/pkt.h */
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/****************************************************************************
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* Name: pkt_recvmsg
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*
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* Description:
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* Implements the socket recvmsg interface for the case of the AF_INET
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* and AF_INET6 address families. pkt_recvmsg() receives messages from
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* a socket, and may be used to receive data on a socket whether or not it
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* is connection-oriented.
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*
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* If 'msg_name' is not NULL, and the underlying protocol provides the
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* source address, this source address is filled in. The argument
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* 'msg_namelen' is initialized to the size of the buffer associated with
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* msg_name, and modified on return to indicate the actual size of the
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* address stored there.
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*
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* Input Parameters:
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* psock A pointer to a NuttX-specific, internal socket structure
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* msg Buffer to receive the message
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* flags Receive flags
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*
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* Returned Value:
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* On success, returns the number of characters received. If no data is
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* available to be received and the peer has performed an orderly shutdown,
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* recvmsg() will return 0. Otherwise, on errors, a negated errno value is
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* returned (see recvmsg() for the list of appropriate error values).
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*
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****************************************************************************/
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ssize_t pkt_recvmsg(FAR struct socket *psock, FAR struct msghdr *msg,
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int flags);
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/****************************************************************************
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* Name: pkt_find_device
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*
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* Description:
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* Select the network driver to use with the PKT transaction.
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*
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* Input Parameters:
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* conn - PKT connection structure.
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*
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* Returned Value:
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* A pointer to the network driver to use.
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*
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****************************************************************************/
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FAR struct net_driver_s *pkt_find_device(FAR struct pkt_conn_s *conn);
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/****************************************************************************
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* Name: pkt_poll
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*
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* Description:
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* Poll a packet "connection" structure for availability of TX data
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*
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* Input Parameters:
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* dev - The device driver structure to use in the send operation
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* conn - The packet "connection" to poll for TX data
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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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* Called from the network device interface (devif) with the network
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* locked.
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*
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****************************************************************************/
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void pkt_poll(FAR struct net_driver_s *dev, FAR struct pkt_conn_s *conn);
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/****************************************************************************
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* Name: pkt_pollsetup
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*
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* Description:
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* Setup to monitor events on one PKT socket
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*
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* Input Parameters:
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* psock - The PKT socket of interest
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* fds - The structure describing the events to be monitored, OR NULL if
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* this is a request to stop monitoring events.
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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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int pkt_pollsetup(FAR struct socket *psock, FAR struct pollfd *fds);
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/****************************************************************************
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* Name: pkt_pollteardown
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*
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* Description:
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* Teardown monitoring of events on an PKT socket
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*
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* Input Parameters:
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* psock - The PKT socket of interest
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* fds - The structure describing the events to be monitored, OR NULL if
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* this is a request to stop monitoring events.
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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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int pkt_pollteardown(FAR struct socket *psock, FAR struct pollfd *fds);
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/****************************************************************************
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* Name: pkt_sendmsg
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*
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* Description:
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* The pkt_sendmsg() call may be used only when the packet socket is in
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* a connected state (so that the intended recipient is known).
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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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* msg Message to send
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* flags Send flags
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*
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* Returned Value:
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* On success, returns the number of characters sent. On error, a negated
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* errno value is returned (see sendmsg() for the complete list of return
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* values.
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*
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****************************************************************************/
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ssize_t pkt_sendmsg(FAR struct socket *psock, FAR const struct msghdr *msg,
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int flags);
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#ifdef CONFIG_NET_PKTPROTO_OPTIONS
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/****************************************************************************
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* Name: pkt_getsockopt
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*
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* Description:
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* pkt_getsockopt() retrieves the value for the option specified by the
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* 'option' argument for the socket specified by the 'psock' argument. If
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* the size of the option value is greater than 'value_len', the value
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* stored in the object pointed to by the 'value' argument will be silently
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* truncated. Otherwise, the length pointed to by the 'value_len' argument
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* will be modified to indicate the actual length of the 'value'.
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*
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* See <sys/socket.h> a complete list of values for the socket-level
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* 'option' argument. Protocol-specific options are are protocol specific
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* header files (such as nuttx/pkt.h for the case of the PKT protocol).
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*
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* Input Parameters:
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* psock Socket structure of the socket to query
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* level Protocol level to set the option
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* option identifies the option to get
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* value Points to the argument value
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* value_len The length of the argument value
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*
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* Returned Value:
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* Returns zero (OK) on success. On failure, it returns a negated errno
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* value to indicate the nature of the error. See psock_getsockopt() for
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* the complete list of appropriate return error codes.
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*
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****************************************************************************/
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int pkt_getsockopt(FAR struct socket *psock, int level, int option,
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FAR void *value, FAR socklen_t *value_len);
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/****************************************************************************
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* Name: pkt_setsockopt
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*
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* Description:
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* pkt_setsockopt() sets the PKT-protocol option specified by the
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* 'option' argument to the value pointed to by the 'value' argument for
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* the socket specified by the 'psock' argument.
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*
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* See <nuttx/pkt.h> for the a complete list of values of PKT protocol
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* options.
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*
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* Input Parameters:
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* psock Socket structure of socket to operate on
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* level Protocol level to set the option
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* option identifies the option to set
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* value Points to the argument value
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* value_len The length of the argument value
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*
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* Returned Value:
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* Returns zero (OK) on success. On failure, it returns a negated errno
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* value to indicate the nature of the error. See psock_setcockopt() for
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* the list of possible error values.
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*
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****************************************************************************/
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int pkt_setsockopt(FAR struct socket *psock, int level, int option,
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FAR const void *value, socklen_t value_len);
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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_PKT */
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#endif /* __NET_PKT_PKT_H */
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