191 lines
6.2 KiB
C
191 lines
6.2 KiB
C
/****************************************************************************
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* net/socket/net_fstat.c
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*
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* Copyright (C) 2018 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/stat.h>
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#include <string.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/net/netconfig.h>
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#include <nuttx/net/net.h>
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#include <nuttx/net/netdev.h>
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#include "tcp/tcp.h"
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#include "udp/udp.h"
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#include "socket/socket.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: net_fstat
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*
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* Description:
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* Performs fstat operations on socket
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*
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* Input Parameters:
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* sockfd - Socket descriptor of the socket to operate on
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* bug - Caller-provided location in which to return the fstat data
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*
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* Returned Value:
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* Zero (OK) is returned on success; a negated errno value is returned on
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* any failure to indicate the nature of the failure.
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*
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****************************************************************************/
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int net_fstat(int sockfd, FAR struct stat *buf)
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{
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FAR struct socket *psock;
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int ret = OK;
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/* Get the underlying socket structure */
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psock = sockfd_socket(sockfd);
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if (psock == NULL)
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{
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/* sockfd does not refer to a valid, open socket */
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return -EBADF;
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}
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/* Return fstat data. The st_mode and st_blksize fields are the only
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* fields set for socket descriptors. The st_mode field is set to a value
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* that indicates the descriptor is a socket descriptor and the st_blksize
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* field is set to an optimal value determined by the system. The optimal
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* packet size is the MSS.
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*/
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memset(buf, 0, sizeof(struct stat));
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buf->st_mode = S_IFSOCK;
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/* The socket must be open and in a connected state in order to get the
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* MSS. There may be multiple networks served by different network
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* devices, each supporting a different MSS.
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*/
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if (psock->s_conn == NULL || !_SS_ISCONNECTED(psock->s_flags))
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{
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/* Not connected.. Return an optimal blocksize of zero (or, perhaps,
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* even an error?)
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*
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* REVISIT: The concept of connected only applies to TCP and UDP
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* sockets. Other sockets, such raw radio sockets, have no such
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* concept.
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*/
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nwarn("WARNING: Socket not connected\n");
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return OK;
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}
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/* We are only prepared to handle the MSS of connected TCP/IP and UDP
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* sockets here.
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*/
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switch (psock->s_type)
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{
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#if defined(NET_TCP_HAVE_STACK)
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case SOCK_STREAM:
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{
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FAR struct tcp_conn_s *conn = (FAR struct tcp_conn_s *)psock->s_conn;
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/* For TCP, the MSS is a dynamic value that maintained in the
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* connection structure.
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*/
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buf->st_blksize = conn->mss;
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}
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break;
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#endif
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#if defined(NET_UDP_HAVE_STACK)
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case SOCK_DGRAM:
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{
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FAR struct udp_conn_s *conn = (FAR struct udp_conn_s *)psock->s_conn;
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FAR struct net_driver_s *dev;
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uint16_t iplen;
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/* For a connected UDP socket, we have do do a little more work:
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*
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* MSS = MTU - LL_HDRLEN - UDP_HDRLEN - IP_HDRLEN
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*
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* We need to have the device that services the connection in order
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* to get the MTU and LL_HDRLEN:
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*/
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dev = udp_find_raddr_device(conn);
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if (dev == NULL)
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{
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/* This should never happen except perhaps in some rare race
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* condition. If the UDP socket is connected, then the device
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* service the network that it is connected to should always
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* exist.
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*/
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nerr("ERROR: Could not find network device\n");
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ret = -ENODEV;
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}
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else
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{
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/* We need the length of the IP header */
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#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
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iplen = (conn->domain == PF_INET) ? IPv4_HDRLEN : IPv6_HDRLEN;
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#elif defined(CONFIG_NET_IPv4)
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iplen = IPv4_HDRLEN;
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#else
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iplen = IPv6_HDRLEN;
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#endif
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/* Now we can calculate the MSS */
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buf->st_blksize = UDP_MSS(dev, iplen);
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}
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}
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break;
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#endif
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default:
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nwarn("WARNING: Unhandled socket type: %u\n", psock->s_type);
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break;
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}
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return ret;
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}
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