309 lines
9.1 KiB
C
309 lines
9.1 KiB
C
/****************************************************************************
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* net/tcp/tcp_accept.c
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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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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#ifdef CONFIG_NET_TCP
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <string.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 <nuttx/semaphore.h>
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#include <nuttx/net/net.h>
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#include "socket/socket.h"
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#include "tcp/tcp.h"
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct accept_s
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{
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sem_t acpt_sem; /* Wait for driver event */
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FAR struct sockaddr *acpt_addr; /* Return connection address */
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FAR socklen_t *acpt_addrlen; /* Return length of address */
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FAR struct tcp_conn_s *acpt_newconn; /* The accepted connection */
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int acpt_result; /* The result of the wait */
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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: accept_tcpsender
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*
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* Description:
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* Get the sender's address from the UDP packet
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*
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* Input Parameters:
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* listener - The connection structure of the listener
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* conn - The newly accepted TCP connection
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* pstate - the recvfrom state structure
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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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* The network is locked
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*
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****************************************************************************/
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static inline void accept_tcpsender(FAR struct tcp_conn_s *listener,
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FAR struct tcp_conn_s *conn,
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FAR struct sockaddr *addr,
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socklen_t *addrlen)
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{
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if (addr)
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{
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/* If an address is provided, then the length must also be provided. */
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DEBUGASSERT(addrlen);
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#ifdef CONFIG_NET_IPv4
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#ifdef CONFIG_NET_IPv6
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/* If both IPv4 and IPv6 support are enabled, then we will need to
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* select which one to use when obtaining the sender's IP address.
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*/
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if (listener->domain == PF_INET)
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#endif /* CONFIG_NET_IPv6 */
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{
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FAR struct sockaddr_in *inaddr = (FAR struct sockaddr_in *)addr;
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inaddr->sin_family = AF_INET;
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inaddr->sin_port = conn->rport;
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net_ipv4addr_copy(inaddr->sin_addr.s_addr, conn->u.ipv4.raddr);
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memset(inaddr->sin_zero, 0, sizeof(inaddr->sin_zero));
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*addrlen = sizeof(struct sockaddr_in);
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}
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#endif /* CONFIG_NET_IPv4 */
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#ifdef CONFIG_NET_IPv6
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#ifdef CONFIG_NET_IPv4
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/* Otherwise, this the IPv6 address is needed */
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else
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#endif /* CONFIG_NET_IPv4 */
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{
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FAR struct sockaddr_in6 *inaddr = (FAR struct sockaddr_in6 *)addr;
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#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
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DEBUGASSERT(listener->domain == PF_INET6);
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#endif
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inaddr->sin6_family = AF_INET6;
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inaddr->sin6_port = conn->rport;
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net_ipv6addr_copy(inaddr->sin6_addr.s6_addr, conn->u.ipv6.raddr);
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*addrlen = sizeof(struct sockaddr_in6);
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}
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#endif /* CONFIG_NET_IPv6 */
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}
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}
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/****************************************************************************
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* Name: accept_eventhandler
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*
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* Description:
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* Receive event callbacks when connections occur
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*
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* Input Parameters:
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* listener The connection structure of the listener
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* conn The connection structure that was just accepted
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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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* The network is locked
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*
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****************************************************************************/
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static int accept_eventhandler(FAR struct tcp_conn_s *listener,
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FAR struct tcp_conn_s *conn)
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{
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struct accept_s *pstate = (struct accept_s *)listener->accept_private;
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int ret = -EINVAL;
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if (pstate)
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{
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/* Get the connection address */
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accept_tcpsender(listener, conn, pstate->acpt_addr,
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pstate->acpt_addrlen);
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/* Save the connection structure */
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pstate->acpt_newconn = conn;
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pstate->acpt_result = OK;
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/* There should be a reference of one on the new connection */
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DEBUGASSERT(conn->crefs == 1);
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/* Wake-up the waiting caller thread */
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nxsem_post(&pstate->acpt_sem);
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/* Stop any further callbacks */
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listener->accept_private = NULL;
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listener->accept = NULL;
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ret = OK;
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}
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return ret;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: tcp_accept
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*
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* Description:
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* This function implements accept() for TCP/IP sockets. See the
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* description of accept() for further information.
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*
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* Input Parameters:
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* psock The listening TCP socket structure
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* addr Receives the address of the connecting client
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* addrlen Input: allocated size of 'addr', Return: returned size of
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* 'addr'
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* newconn The new, accepted TCP connection structure
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*
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* Returned Value:
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* Returns zero (OK) on success or a negated errno value on failure.
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* See the description of accept of the possible errno values in the
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* description of accept().
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*
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* Assumptions:
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* Network is locked.
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*
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****************************************************************************/
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int psock_tcp_accept(FAR struct socket *psock, FAR struct sockaddr *addr,
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FAR socklen_t *addrlen, FAR void **newconn)
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{
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FAR struct tcp_conn_s *conn;
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struct accept_s state;
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int ret;
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/* Check the backlog to see if there is a connection already pending for
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* this listener.
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*/
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conn = psock->s_conn;
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#ifdef CONFIG_NET_TCPBACKLOG
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state.acpt_newconn = tcp_backlogremove(conn);
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if (state.acpt_newconn)
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{
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/* Yes... get the address of the connected client */
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ninfo("Pending conn=%p\n", state.acpt_newconn);
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accept_tcpsender(conn, state.acpt_newconn, addr, addrlen);
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}
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/* In general, this implementation will not support non-blocking socket
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* operations... except in a few cases: Here for TCP accept with
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* backlog enabled. If this socket is configured as non-blocking then
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* return EAGAIN if there is no pending connection in the backlog.
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*/
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else if (_SS_ISNONBLOCK(conn->sconn.s_flags))
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{
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return -EAGAIN;
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}
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else
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#endif
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{
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/* Perform the TCP accept operation */
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/* Initialize the state structure. This is done with the network
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* locked because we don't want anything to happen until we are
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* ready.
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*/
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state.acpt_addr = addr;
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state.acpt_addrlen = addrlen;
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state.acpt_newconn = NULL;
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state.acpt_result = OK;
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nxsem_init(&state.acpt_sem, 0, 0);
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/* Set up the callback in the connection */
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conn->accept_private = (FAR void *)&state;
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conn->accept = accept_eventhandler;
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/* Wait for the send to complete or an error to occur: NOTES:
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* net_sem_wait will also terminate if a signal is received.
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*/
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ret = net_sem_wait(&state.acpt_sem);
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/* Make sure that no further events are processed */
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conn->accept_private = NULL;
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conn->accept = NULL;
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nxsem_destroy(&state.acpt_sem);
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/* Check for a errors. Errors are signalled by negative errno values
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* for the send length.
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*/
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if (state.acpt_result != 0)
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{
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DEBUGASSERT(state.acpt_result > 0);
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return -state.acpt_result;
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}
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/* If net_sem_wait failed, then we were probably reawakened by a
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* signal. In this case, net_sem_wait will have returned negated
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* errno appropriately.
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*/
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if (ret < 0)
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{
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return ret;
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}
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}
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*newconn = (FAR void *)state.acpt_newconn;
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return OK;
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}
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#endif /* CONFIG_NET_TCP */
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