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440 lines
14 KiB
440 lines
14 KiB
/**************************************************************************** |
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* net/sendto.c |
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* |
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* Copyright (C) 2007-2009, 2011-2012 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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#ifdef CONFIG_NET |
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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 <string.h> |
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#include <errno.h> |
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#include <debug.h> |
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#include <arch/irq.h> |
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#include <net/uip/uip-arch.h> |
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#include "net_internal.h" |
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#include "uip/uip_internal.h" |
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/**************************************************************************** |
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* Definitions |
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****************************************************************************/ |
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/**************************************************************************** |
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* Private Types |
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****************************************************************************/ |
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struct sendto_s |
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{ |
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FAR struct uip_callback_s *st_cb; /* Reference to callback instance */ |
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sem_t st_sem; /* Semaphore signals sendto completion */ |
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uint16_t st_buflen; /* Length of send buffer (error if <0) */ |
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const char *st_buffer; /* Pointer to send buffer */ |
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int st_sndlen; /* Result of the send (length sent or negated errno) */ |
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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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* Function: sendto_interrupt |
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* |
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* Description: |
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* This function is called from the interrupt level to perform the actual |
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* send operation when polled by the uIP layer. |
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* |
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* Parameters: |
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* dev The sructure of the network driver that caused the interrupt |
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* conn An instance of the UDP connection structure cast to void * |
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* pvpriv An instance of struct sendto_s cast to void* |
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* flags Set of events describing why the callback was invoked |
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* |
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* Returned Value: |
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* Modified value of the input flags |
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* |
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* Assumptions: |
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* Running at the interrupt level |
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* |
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****************************************************************************/ |
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#ifdef CONFIG_NET_UDP |
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static uint16_t sendto_interrupt(struct uip_driver_s *dev, void *conn, |
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void *pvpriv, uint16_t flags) |
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{ |
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struct sendto_s *pstate = (struct sendto_s *)pvpriv; |
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nllvdbg("flags: %04x\n", flags); |
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if (pstate) |
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{ |
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/* Check if the outgoing packet is available (it may have been claimed |
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* by a sendto interrupt serving a different thread -OR- if the output |
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* buffer currently contains unprocessed incoming data. In these cases |
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* we will just have to wait for the next polling cycle. |
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*/ |
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if (dev->d_sndlen > 0 || (flags & UIP_NEWDATA) != 0) |
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{ |
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/* Another thread has beat us sending data or the buffer is busy, |
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* wait for the next polling cycle |
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*/ |
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return flags; |
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} |
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/* It looks like we are good to send the data */ |
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else |
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{ |
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/* Copy the user data into d_snddata and send it */ |
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uip_send(dev, pstate->st_buffer, pstate->st_buflen); |
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pstate->st_sndlen = pstate->st_buflen; |
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} |
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/* Don't allow any further call backs. */ |
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pstate->st_cb->flags = 0; |
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pstate->st_cb->priv = NULL; |
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pstate->st_cb->event = NULL; |
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/* Wake up the waiting thread */ |
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sem_post(&pstate->st_sem); |
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} |
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return flags; |
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} |
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#endif |
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/**************************************************************************** |
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* Global 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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#ifdef CONFIG_NET_UDP |
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FAR struct uip_udp_conn *conn; |
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#ifdef CONFIG_NET_IPv6 |
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FAR const struct sockaddr_in6 *into = (const struct sockaddr_in6 *)to; |
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#else |
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FAR const struct sockaddr_in *into = (const struct sockaddr_in *)to; |
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#endif |
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struct sendto_s state; |
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uip_lock_t save; |
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int ret; |
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#endif |
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int err; |
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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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#ifdef CONFIG_NET_TCP |
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return psock_send(psock, buf, len, flags); |
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#else |
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err = EINVAL; |
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goto errout; |
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#endif |
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} |
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/* Verify that a valid address has been provided */ |
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#ifdef CONFIG_NET_IPv6 |
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if (to->sa_family != AF_INET6 || tolen < sizeof(struct sockaddr_in6)) |
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#else |
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if (to->sa_family != AF_INET || tolen < sizeof(struct sockaddr_in)) |
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#endif |
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{ |
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err = 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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err = 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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err = EISCONN; |
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goto errout; |
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} |
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/* Perform the UDP sendto operation */ |
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#ifdef CONFIG_NET_UDP |
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/* Set the socket state to sending */ |
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psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_SEND); |
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/* Initialize the state structure. This is done with interrupts |
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* disabled because we don't want anything to happen until we |
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* are ready. |
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*/ |
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save = uip_lock(); |
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memset(&state, 0, sizeof(struct sendto_s)); |
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sem_init(&state.st_sem, 0, 0); |
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state.st_buflen = len; |
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state.st_buffer = buf; |
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/* Setup the UDP socket */ |
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conn = (struct uip_udp_conn *)psock->s_conn; |
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ret = uip_udpconnect(conn, into); |
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if (ret < 0) |
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{ |
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uip_unlock(save); |
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err = -ret; |
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goto errout; |
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} |
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/* Set up the callback in the connection */ |
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state.st_cb = uip_udpcallbackalloc(conn); |
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if (state.st_cb) |
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{ |
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state.st_cb->flags = UIP_POLL; |
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state.st_cb->priv = (void*)&state; |
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state.st_cb->event = sendto_interrupt; |
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/* Enable the UDP socket */ |
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uip_udpenable(conn); |
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/* Notify the device driver of the availabilty of TX data */ |
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netdev_txnotify(&conn->ripaddr); |
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/* Wait for either the receive to complete or for an error/timeout to occur. |
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* NOTES: (1) uip_lockedwait will also terminate if a signal is received, (2) |
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* interrupts may be disabled! They will be re-enabled while the task sleeps |
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* and automatically re-enabled when the task restarts. |
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*/ |
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uip_lockedwait(&state.st_sem); |
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/* Make sure that no further interrupts are processed */ |
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uip_udpdisable(conn); |
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uip_udpcallbackfree(conn, state.st_cb); |
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} |
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uip_unlock(save); |
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sem_destroy(&state.st_sem); |
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/* Set the socket state to idle */ |
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psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_IDLE); |
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/* Check for errors */ |
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if (state.st_sndlen < 0) |
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{ |
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err = -state.st_sndlen; |
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goto errout; |
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} |
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/* Sucess */ |
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return state.st_sndlen; |
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#else |
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err = ENOSYS; |
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#endif |
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errout: |
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errno = err; |
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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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/* 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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return psock_sendto(psock, buf, len, flags, to, tolen); |
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} |
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#endif /* CONFIG_NET */
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