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incubator-nuttx/net/connect.c

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/****************************************************************************
* net/connect.c
*
* Copyright (C) 2007-2010 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#ifdef CONFIG_NET
#include <sys/types.h>
#include <sys/socket.h>
#include <stdint.h>
#include <errno.h>
#include <debug.h>
#include <arch/irq.h>
#include <net/uip/uip-arch.h>
#include "net_internal.h"
#include "uip/uip_internal.h"
/****************************************************************************
* Private Types
****************************************************************************/
#ifdef CONFIG_NET_TCP
struct tcp_connect_s
{
FAR struct uip_conn *tc_conn; /* Reference to TCP connection structure */
FAR struct uip_callback_s *tc_cb; /* Reference to callback instance */
sem_t tc_sem; /* Semaphore signals recv completion */
int tc_result; /* OK on success, otherwise a negated errno. */
};
#endif
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
#ifdef CONFIG_NET_TCP
static void connection_event(struct uip_conn *conn, uint16_t flags);
static inline int tcp_setup_callbacks(FAR struct socket *psock,
FAR struct tcp_connect_s *pstate);
static inline void tcp_teardown_callbacks(struct tcp_connect_s *pstate, int status);
static uint16_t tcp_connect_interrupt(struct uip_driver_s *dev, void *pvconn,
void *pvpriv, uint16_t flags);
#ifdef CONFIG_NET_IPv6
static inline int tcp_connect(FAR struct socket *psock, const struct sockaddr_in6 *inaddr);
#else
static inline int tcp_connect(FAR struct socket *psock, const struct sockaddr_in *inaddr);
#endif
#endif /* CONFIG_NET_TCP */
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Function: connection_event
*
* Description:
* Some connection related event has occurred
*
* Parameters:
* dev The sructure of the network driver that caused the interrupt
* conn The connection structure associated with the socket
* flags Set of events describing why the callback was invoked
*
* Returned Value:
* None
*
* Assumptions:
* Running at the interrupt level
*
****************************************************************************/
#ifdef CONFIG_NET_TCP
static void connection_event(struct uip_conn *conn, uint16_t flags)
{
FAR struct socket *psock = (FAR struct socket *)conn->connection_private;
if (psock)
{
nllvdbg("flags: %04x s_flags: %02x\n", flags, psock->s_flags);
/* UIP_CLOSE: The remote host has closed the connection
* UIP_ABORT: The remote host has aborted the connection
* UIP_TIMEDOUT: Connection aborted due to too many retransmissions.
*/
if ((flags & (UIP_CLOSE|UIP_ABORT|UIP_TIMEDOUT)) != 0)
{
/* Indicate that the socket is no longer connected */
psock->s_flags &= ~_SF_CONNECTED;
}
/* UIP_CONNECTED: The socket is successfully connected */
else if ((flags & UIP_CONNECTED) != 0)
{
/* Indicate that the socket is now connected */
psock->s_flags |= _SF_CONNECTED;
}
}
}
#endif /* CONFIG_NET_TCP */
/****************************************************************************
* Function: tcp_setup_callbacks
****************************************************************************/
#ifdef CONFIG_NET_TCP
static inline int tcp_setup_callbacks(FAR struct socket *psock,
FAR struct tcp_connect_s *pstate)
{
FAR struct uip_conn *conn = psock->s_conn;
int ret = -EBUSY;
/* Initialize the TCP state structure */
(void)sem_init(&pstate->tc_sem, 0, 0); /* Doesn't really fail */
pstate->tc_conn = conn;
pstate->tc_result = -EAGAIN;
/* Set up the callbacks in the connection */
pstate->tc_cb = uip_tcpcallbackalloc(conn);
if (pstate->tc_cb)
{
pstate->tc_cb->flags = UIP_NEWDATA|UIP_CLOSE|UIP_ABORT|UIP_TIMEDOUT|UIP_CONNECTED;
pstate->tc_cb->priv = (void*)pstate;
pstate->tc_cb->event = tcp_connect_interrupt;
/* Set up to receive callbacks on connection-related events */
conn->connection_private = (void*)psock;
conn->connection_event = connection_event;
ret = OK;
}
return ret;
}
#endif /* CONFIG_NET_TCP */
/****************************************************************************
* Function: tcp_teardown_callbacks
****************************************************************************/
#ifdef CONFIG_NET_TCP
static inline void tcp_teardown_callbacks(struct tcp_connect_s *pstate, int status)
{
struct uip_conn *conn = pstate->tc_conn;
/* Make sure that no further interrupts are processed */
uip_tcpcallbackfree(conn, pstate->tc_cb);
/* If we successfully connected, we will continue to monitor the connection state
* via callbacks.
*/
if (status < 0)
{
/* Failed to connect */
conn->connection_private = NULL;
conn->connection_event = NULL;
}
}
#endif /* CONFIG_NET_TCP */
/****************************************************************************
* Function: tcp_connect_interrupt
*
* Description:
* This function is called from the interrupt level to perform the actual
* connection operation via by the uIP layer.
*
* Parameters:
* dev The sructure of the network driver that caused the interrupt
* pvconn The connection structure associated with the socket
* flags Set of events describing why the callback was invoked
*
* Returned Value:
* The new flags setting
*
* Assumptions:
* Running at the interrupt level
*
****************************************************************************/
#ifdef CONFIG_NET_TCP
static uint16_t tcp_connect_interrupt(struct uip_driver_s *dev, void *pvconn,
void *pvpriv, uint16_t flags)
{
struct tcp_connect_s *pstate = (struct tcp_connect_s *)pvpriv;
nllvdbg("flags: %04x\n", flags);
/* 'priv' might be null in some race conditions (?) */
if (pstate)
{
/* The following errors should be detected here (someday)
*
* ECONNREFUSED
* No one listening on the remote address.
* ENETUNREACH
* Network is unreachable.
* ETIMEDOUT
* Timeout while attempting connection. The server may be too busy
* to accept new connections.
*/
/* UIP_CLOSE: The remote host has closed the connection
* UIP_ABORT: The remote host has aborted the connection
*/
if ((flags & (UIP_CLOSE|UIP_ABORT)) != 0)
{
/* Indicate that remote host refused the connection */
pstate->tc_result = -ECONNREFUSED;
}
/* UIP_TIMEDOUT: Connection aborted due to too many retransmissions. */
else if ((flags & UIP_TIMEDOUT) != 0)
{
/* Indicate that the remote host is unreachable (or should this be timedout?) */
pstate->tc_result = -ETIMEDOUT;
}
/* UIP_CONNECTED: The socket is successfully connected */
else if ((flags & UIP_CONNECTED) != 0)
{
/* Indicate that the socket is no longer connected */
pstate->tc_result = OK;
}
/* Otherwise, it is not an event of importance to us at the moment */
else
{
/* Drop data received in this state */
dev->d_len = 0;
return flags & ~UIP_NEWDATA;
}
nllvdbg("Resuming: %d\n", pstate->tc_result);
/* Stop further callbacks */
tcp_teardown_callbacks(pstate, pstate->tc_result);
/* Wake up the waiting thread */
sem_post(&pstate->tc_sem);
}
return flags;
}
#endif /* CONFIG_NET_TCP */
/****************************************************************************
* Function: tcp_connect
*
* Description:
* Perform a TCP connection
*
* Parameters:
* psock A reference to the socket structure of the socket to be connected
* inaddr The address of the remote server to connect to
*
* Returned Value:
* None
*
* Assumptions:
* Running at the interrupt level
*
****************************************************************************/
#ifdef CONFIG_NET_TCP
#ifdef CONFIG_NET_IPv6
static inline int tcp_connect(FAR struct socket *psock, const struct sockaddr_in6 *inaddr)
#else
static inline int tcp_connect(FAR struct socket *psock, const struct sockaddr_in *inaddr)
#endif
{
struct tcp_connect_s state;
irqstate_t flags;
int ret = OK;
/* Interrupts must be disabled through all of the following because
* we cannot allow the network callback to occur until we are completely
* setup.
*/
flags = irqsave();
/* Get the connection reference from the socket */
if (!psock->s_conn) /* Should always be non-NULL */
{
ret = -EINVAL;
}
else
{
/* Perform the uIP connection operation */
ret = uip_tcpconnect(psock->s_conn, inaddr);
}
if (ret >= 0)
{
/* Set up the callbacks in the connection */
ret = tcp_setup_callbacks(psock, &state);
if (ret >= 0)
{
/* Wait for either the connect to complete or for an error/timeout
* to occur. NOTES: (1) sem_wait will also terminate if a signal
* is received, (2) interrupts are disabled! They will be re-
* enabled while the task sleeps and automatically re-disabled
* when the task restarts.
*/
ret = sem_wait(&state.tc_sem);
/* Uninitialize the state structure */
(void)sem_destroy(&state.tc_sem);
/* If sem_wait failed, recover the negated error (probably -EINTR) */
if (ret < 0)
{
int err = errno;
if (err >= 0)
{
err = ENOSYS;
}
ret = -err;
}
else
{
/* If the wait succeeded, then get the new error value from
* the state structure
*/
ret = state.tc_result;
}
/* Make sure that no further interrupts are processed */
tcp_teardown_callbacks(&state, ret);
}
/* Mark the connection bound and connected */
if (ret >= 0)
{
psock->s_flags |= (_SF_BOUND|_SF_CONNECTED);
}
}
irqrestore(flags);
return ret;
}
#endif /* CONFIG_NET_TCP */
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: connect
*
* Description:
* connect() connects the socket referred to by the file descriptor sockfd
* to the address specified by 'addr'. The addrlen argument specifies
* the size of 'addr'. The format of the address in 'addr' is
* determined by the address space of the socket sockfd.
*
* If the socket sockfd is of type SOCK_DGRAM then 'addr' is the address
* to which datagrams are sent by default, and the only address from which
* datagrams are received. If the socket is of type SOCK_STREAM or
* SOCK_SEQPACKET, this call attempts to make a connection to the socket
* that is bound to the address specified by 'addr'.
*
* Generally, connection-based protocol sockets may successfully connect()
* only once; connectionless protocol sockets may use connect() multiple
* times to change their association. Connectionless sockets may dissolve
* the association by connecting to an address with the sa_family member of
* sockaddr set to AF_UNSPEC.
*
* Parameters:
* sockfd Socket descriptor returned by socket()
* addr Server address (form depends on type of socket)
* addrlen Length of actual 'addr'
*
* Returned Value:
* 0 on success; -1 on error with errno set appropriately
*
* EACCES, EPERM
* The user tried to connect to a broadcast address without having the
* socket broadcast flag enabled or the connection request failed
* because of a local firewall rule.
* EADDRINUSE
* Local address is already in use.
* EAFNOSUPPORT
* The passed address didn't have the correct address family in its
* sa_family field.
* EAGAIN
* No more free local ports or insufficient entries in the routing
* cache.
* EALREADY
* The socket is non-blocking and a previous connection attempt has
* not yet been completed.
* EBADF
* The file descriptor is not a valid index in the descriptor table.
* ECONNREFUSED
* No one listening on the remote address.
* EFAULT
* The socket structure address is outside the user's address space.
* EINPROGRESS
* The socket is non-blocking and the connection cannot be completed
* immediately.
* EINTR
* The system call was interrupted by a signal that was caught.
* EISCONN
* The socket is already connected.
* ENETUNREACH
* Network is unreachable.
* ENOTSOCK
* The file descriptor is not associated with a socket.
* ETIMEDOUT
* Timeout while attempting connection. The server may be too busy
* to accept new connections.
*
* Assumptions:
*
****************************************************************************/
int connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen)
{
FAR struct socket *psock = sockfd_socket(sockfd);
#if defined(CONFIG_NET_TCP) || defined(CONFIG_NET_UDP)
#ifdef CONFIG_NET_IPv6
FAR const struct sockaddr_in6 *inaddr = (const struct sockaddr_in6 *)addr;
#else
FAR const struct sockaddr_in *inaddr = (const struct sockaddr_in *)addr;
#endif
int ret;
#endif
int err;
/* Verify that the sockfd corresponds to valid, allocated socket */
if (!psock || psock->s_crefs <= 0)
{
err = EBADF;
goto errout;
}
/* Verify that a valid address has been provided */
#ifdef CONFIG_NET_IPv6
if (addr->sa_family != AF_INET6 || addrlen < sizeof(struct sockaddr_in6))
#else
if (addr->sa_family != AF_INET || addrlen < sizeof(struct sockaddr_in))
#endif
{
err = EBADF;
goto errout;
}
/* Perform the connection depending on the protocol type */
switch (psock->s_type)
{
#ifdef CONFIG_NET_TCP
case SOCK_STREAM:
{
/* Verify that the socket is not already connected */
if (_SS_ISCONNECTED(psock->s_flags))
{
err = EISCONN;
goto errout;
}
/* Its not ... connect it */
ret = tcp_connect(psock, inaddr);
if (ret < 0)
{
err = -ret;
goto errout;
}
}
break;
#endif
#ifdef CONFIG_NET_UDP
case SOCK_DGRAM:
{
ret = uip_udpconnect(psock->s_conn, inaddr);
if (ret < 0)
{
err = -ret;
goto errout;
}
}
break;
#endif
default:
err = EBADF;
goto errout;
}
return OK;
errout:
errno = err;
return ERROR;
}
#endif /* CONFIG_NET */
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