cd3c9634c8
User-space networking stack API allows user-space daemon to provide TCP/IP stack implementation for NuttX network. Main use for this is to allow use and seamless integration of HW-provided TCP/IP stacks to NuttX. For example, user-space daemon can translate /dev/usrsock API requests to HW TCP/IP API requests while rest of the user-space can access standard socket API, with socket descriptors that can be used with NuttX system calls.
352 lines
11 KiB
C
352 lines
11 KiB
C
/****************************************************************************
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* net/socket/sendto.c
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*
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* Copyright (C) 2007-2009, 2011-2015 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/types.h>
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#include <sys/socket.h>
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#include <stdint.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/cancelpt.h>
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#include <nuttx/net/net.h>
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#include "udp/udp.h"
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#include "local/local.h"
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#include "socket/socket.h"
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#include "usrsock/usrsock.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Function: psock_sendto
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*
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* Description:
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* If sendto() is used on a connection-mode (SOCK_STREAM, SOCK_SEQPACKET)
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* socket, the parameters to and 'tolen' are ignored (and the error EISCONN
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* may be returned when they are not NULL and 0), and the error ENOTCONN is
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* returned when the socket was not actually connected.
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*
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* Parameters:
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* psock A pointer to a NuttX-specific, internal socket structure
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* buf Data to send
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* len Length of data to send
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* flags Send flags
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* to Address of recipient
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* tolen The length of the address structure
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*
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* Returned Value:
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* On success, returns the number of characters sent. On error,
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* -1 is returned, and errno is set appropriately:
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*
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* EAGAIN or EWOULDBLOCK
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* The socket is marked non-blocking and the requested operation
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* would block.
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* EBADF
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* An invalid descriptor was specified.
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* ECONNRESET
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* Connection reset by peer.
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* EDESTADDRREQ
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* The socket is not connection-mode, and no peer address is set.
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* EFAULT
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* An invalid user space address was specified for a parameter.
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* EINTR
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* A signal occurred before any data was transmitted.
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* EINVAL
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* Invalid argument passed.
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* EISCONN
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* The connection-mode socket was connected already but a recipient
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* was specified. (Now either this error is returned, or the recipient
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* specification is ignored.)
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* EMSGSIZE
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* The socket type requires that message be sent atomically, and the
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* size of the message to be sent made this impossible.
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* ENOBUFS
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* The output queue for a network interface was full. This generally
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* indicates that the interface has stopped sending, but may be
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* caused by transient congestion.
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* ENOMEM
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* No memory available.
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* ENOTCONN
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* The socket is not connected, and no target has been given.
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* ENOTSOCK
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* The argument s is not a socket.
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* EOPNOTSUPP
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* Some bit in the flags argument is inappropriate for the socket
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* type.
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* EPIPE
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* The local end has been shut down on a connection oriented socket.
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* In this case the process will also receive a SIGPIPE unless
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* MSG_NOSIGNAL is set.
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*
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* Assumptions:
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*
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****************************************************************************/
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ssize_t psock_sendto(FAR struct socket *psock, FAR const void *buf,
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size_t len, int flags, FAR const struct sockaddr *to,
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socklen_t tolen)
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{
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socklen_t minlen;
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#if defined(CONFIG_NET_UDP) || defined(CONFIG_NET_LOCAL_DGRAM) || \
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defined(CONFIG_NET_USRSOCK)
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ssize_t nsent;
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#endif
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int errcode;
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/* If to is NULL or tolen is zero, then this function is same as send (for
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* connected socket types)
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*/
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if (!to || !tolen)
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{
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#if defined(CONFIG_NET_TCP) || defined(CONFIG_NET_LOCAL_STREAM) || \
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defined(CONFIG_NET_USRSOCK)
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return psock_send(psock, buf, len, flags);
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#else
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nerr("ERROR: No 'to' address\n");
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errcode = EINVAL;
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goto errout;
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#endif
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}
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#ifdef CONFIG_NET_USRSOCK
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if (psock->s_type == SOCK_USRSOCK_TYPE)
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{
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/* Perform the usrsock sendto operation */
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nsent = usrsock_sendto(psock, buf, len, to, tolen);
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if (nsent < 0)
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{
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errcode = -nsent;
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goto errout;
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}
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return nsent;
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}
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#endif
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/* Verify that a valid address has been provided */
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switch (to->sa_family)
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{
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#ifdef CONFIG_NET_IPv4
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case AF_INET:
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minlen = sizeof(struct sockaddr_in);
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break;
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#endif
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#ifdef CONFIG_NET_IPv6
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case AF_INET6:
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minlen = sizeof(struct sockaddr_in6);
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break;
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#endif
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#ifdef CONFIG_NET_LOCAL_DGRAM
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case AF_LOCAL:
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minlen = sizeof(sa_family_t);
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break;
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#endif
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default:
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nerr("ERROR: Unrecognized address family: %d\n", to->sa_family);
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errcode = EAFNOSUPPORT;
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goto errout;
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}
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if (tolen < minlen)
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{
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nerr("ERROR: Invalid address length: %d < %d\n", tolen, minlen);
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errcode = EBADF;
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goto errout;
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}
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/* Verify that the psock corresponds to valid, allocated socket */
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if (!psock || psock->s_crefs <= 0)
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{
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nerr("ERROR: Invalid socket\n");
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errcode = EBADF;
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goto errout;
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}
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/* If this is a connected socket, then return EISCONN */
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if (psock->s_type != SOCK_DGRAM)
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{
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nerr("ERROR: Connected socket\n");
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errcode = EISCONN;
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goto errout;
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}
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#if defined(CONFIG_NET_UDP) || defined(CONFIG_NET_LOCAL_DGRAM)
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/* Now handle the sendto() operation according to the socket domain,
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* currently either IP or Unix domains.
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*/
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#ifdef CONFIG_NET_LOCAL_DGRAM
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#ifdef CONFIG_NET_UDP
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if (psock->s_domain == PF_LOCAL)
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#endif
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{
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nsent = psock_local_sendto(psock, buf, len, flags, to, tolen);
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}
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#endif /* CONFIG_NET_LOCAL_DGRAM */
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#ifdef CONFIG_NET_UDP
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#ifdef CONFIG_NET_LOCAL_DGRAM
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else
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#endif
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{
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#ifdef NET_UDP_HAVE_STACK
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nsent = psock_udp_sendto(psock, buf, len, flags, to, tolen);
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#else
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nsent = -ENOSYS;
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#endif
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}
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#endif /* CONFIG_NET_UDP */
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/* Check if the domain-specific sendto() logic failed */
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if (nsent < 0)
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{
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nerr("ERROR: UDP or Unix domain sendto() failed: %ld\n", (long)nsent);
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errcode = -nsent;
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goto errout;
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}
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return nsent;
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#else
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errcode = ENOSYS;
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#endif /* CONFIG_NET_UDP || CONFIG_NET_LOCAL_DGRAM */
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errout:
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set_errno(errcode);
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return ERROR;
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}
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/****************************************************************************
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* Function: sendto
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*
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* Description:
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* If sendto() is used on a connection-mode (SOCK_STREAM, SOCK_SEQPACKET)
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* socket, the parameters to and 'tolen' are ignored (and the error EISCONN
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* may be returned when they are not NULL and 0), and the error ENOTCONN is
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* returned when the socket was not actually connected.
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*
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* Parameters:
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* sockfd Socket descriptor of socket
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* buf Data to send
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* len Length of data to send
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* flags Send flags
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* to Address of recipient
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* tolen The length of the address structure
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*
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* Returned Value:
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* On success, returns the number of characters sent. On error,
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* -1 is returned, and errno is set appropriately:
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*
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* EAGAIN or EWOULDBLOCK
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* The socket is marked non-blocking and the requested operation
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* would block.
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* EBADF
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* An invalid descriptor was specified.
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* ECONNRESET
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* Connection reset by peer.
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* EDESTADDRREQ
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* The socket is not connection-mode, and no peer address is set.
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* EFAULT
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* An invalid user space address was specified for a parameter.
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* EINTR
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* A signal occurred before any data was transmitted.
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* EINVAL
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* Invalid argument passed.
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* EISCONN
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* The connection-mode socket was connected already but a recipient
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* was specified. (Now either this error is returned, or the recipient
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* specification is ignored.)
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* EMSGSIZE
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* The socket type requires that message be sent atomically, and the
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* size of the message to be sent made this impossible.
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* ENOBUFS
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* The output queue for a network interface was full. This generally
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* indicates that the interface has stopped sending, but may be
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* caused by transient congestion.
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* ENOMEM
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* No memory available.
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* ENOTCONN
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* The socket is not connected, and no target has been given.
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* ENOTSOCK
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* The argument s is not a socket.
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* EOPNOTSUPP
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* Some bit in the flags argument is inappropriate for the socket
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* type.
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* EPIPE
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* The local end has been shut down on a connection oriented socket.
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* In this case the process will also receive a SIGPIPE unless
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* MSG_NOSIGNAL is set.
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*
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* Assumptions:
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*
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****************************************************************************/
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ssize_t sendto(int sockfd, FAR const void *buf, size_t len, int flags,
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FAR const struct sockaddr *to, socklen_t tolen)
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{
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FAR struct socket *psock;
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ssize_t ret;
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/* sendto() is a cancellation point */
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(void)enter_cancellation_point();
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/* Get the underlying socket structure */
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psock = sockfd_socket(sockfd);
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/* And let psock_sendto do all of the work */
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ret = psock_sendto(psock, buf, len, flags, to, tolen);
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leave_cancellation_point();
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return ret;
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}
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