250 lines
8.0 KiB
C
250 lines
8.0 KiB
C
/****************************************************************************
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* net/tcp/tcp_getsockopt.c
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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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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/time.h>
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#include <stdint.h>
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#include <errno.h>
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#include <assert.h>
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#include <debug.h>
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#include <netinet/tcp.h>
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#include <nuttx/net/net.h>
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#include <nuttx/net/tcp.h>
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#include "socket/socket.h"
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#include "utils/utils.h"
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#include "tcp/tcp.h"
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#ifdef CONFIG_NET_TCPPROTO_OPTIONS
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: tcp_getsockopt
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*
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* Description:
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* tcp_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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* The 'level' argument specifies the protocol level of the option. To
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* retrieve options at the socket level, specify the level argument as
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* SOL_SOCKET; to retrieve options at the TCP-protocol level, the level
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* argument is SOL_TCP.
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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 netinet/tcp.h for the case of the TCP 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 tcp_getsockopt(FAR struct socket *psock, int option,
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FAR void *value, FAR socklen_t *value_len)
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{
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FAR struct tcp_conn_s *conn;
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int ret;
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DEBUGASSERT(value != NULL && value_len != NULL);
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conn = psock->s_conn;
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/* All of the TCP protocol options apply only TCP sockets. The sockets
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* do not have to be connected.. that might occur later with the KeepAlive
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* already configured.
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*/
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if (psock->s_type != SOCK_STREAM)
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{
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nerr("ERROR: Not a TCP socket\n");
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return -ENOTCONN;
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}
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/* Handle the Keep-Alive option */
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switch (option)
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{
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/* Handle the SO_KEEPALIVE socket-level option.
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*
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* NOTE: SO_KEEPALIVE is not really a socket-level option; it is a
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* protocol-level option. A given TCP connection may service multiple
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* sockets (via dup'ing of the socket). There is, however, still only
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* one connection to be monitored and that is a global attribute across
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* all of the clones that may use the underlying connection.
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*/
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#ifdef CONFIG_NET_TCP_KEEPALIVE
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case SO_KEEPALIVE: /* Verifies TCP connections active by enabling the
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* periodic transmission of probes */
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if (*value_len < sizeof(int))
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{
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/* REVISIT: POSIX says that we should truncate the value if it
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* is larger than value_len. That just doesn't make sense
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* to me in this case.
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*/
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ret = -EINVAL;
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}
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else
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{
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FAR int *keepalive = (FAR int *)value;
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*keepalive = conn->keepalive;
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*value_len = sizeof(int);
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ret = OK;
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}
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break;
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case TCP_NODELAY: /* Avoid coalescing of small segments. */
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if (*value_len < sizeof(int))
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{
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ret = -EINVAL;
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}
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else
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{
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FAR int *nodelay = (FAR int *)value;
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/* Always true here since we do not support Nagle. */
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*nodelay = 1;
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*value_len = sizeof(int);
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ret = OK;
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}
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break;
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case TCP_KEEPIDLE: /* Start keepalives after this IDLE period */
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case TCP_KEEPINTVL: /* Interval between keepalives */
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{
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int dsecs;
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if (option == TCP_KEEPIDLE)
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{
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dsecs = conn->keepidle;
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}
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else
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{
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dsecs = conn->keepintvl;
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}
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if (value == NULL)
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{
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ret = -EINVAL;
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}
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else if (*value_len == sizeof(struct timeval))
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{
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FAR struct timeval *tv = (FAR struct timeval *)value;
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/* Convert the KeepIdle time from deciseconds to struct
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* timeval.
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*/
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net_dsec2timeval(dsecs, tv);
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*value_len = sizeof(struct timeval);
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ret = OK;
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}
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else if (*value_len == sizeof(int))
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{
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FAR int *pdsecs = (FAR int *)value;
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*pdsecs = dsecs;
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ret = OK;
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}
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else
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{
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/* REVISIT: POSIX says that we should truncate the value if it
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* is larger than value_len. That just doesn't make sense
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* to me in this case.
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*/
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ret = -EINVAL;
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}
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}
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break;
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case TCP_KEEPCNT: /* Number of keepalives before death */
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if (*value_len < sizeof(int))
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{
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/* REVISIT: POSIX says that we should truncate the value if it
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* is larger than value_len. That just doesn't make sense
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* to me in this case.
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*/
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ret = -EINVAL;
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}
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else
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{
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FAR int *keepcnt = (FAR int *)value;
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*keepcnt = conn->keepcnt;
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*value_len = sizeof(int);
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ret = OK;
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}
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break;
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#endif /* CONFIG_NET_TCP_KEEPALIVE */
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case TCP_MAXSEG: /* The maximum segment size */
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if (*value_len < sizeof(int))
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{
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/* REVISIT: POSIX says that we should truncate the value if it
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* is larger than value_len. That just doesn't make sense
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* to me in this case.
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*/
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ret = -EINVAL;
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}
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else
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{
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FAR int *mss = (FAR int *)value;
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*mss = conn->mss;
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*value_len = sizeof(int);
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ret = OK;
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}
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break;
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default:
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nerr("ERROR: Unrecognized TCP option: %d\n", option);
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ret = -ENOPROTOOPT;
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break;
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}
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return ret;
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}
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#endif /* CONFIG_NET_TCPPROTO_OPTIONS */
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