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incubator-nuttx/net/pkt/pkt_sendmsg.c

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/****************************************************************************
* net/pkt/pkt_sendmsg.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#if defined(CONFIG_NET) && defined(CONFIG_NET_PKT)
#include <sys/types.h>
#include <sys/socket.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#include <arch/irq.h>
#include <nuttx/semaphore.h>
#include <nuttx/net/netdev.h>
#include <nuttx/net/net.h>
#include <nuttx/net/ip.h>
#include "netdev/netdev.h"
#include "devif/devif.h"
#include "socket/socket.h"
#include "pkt/pkt.h"
/****************************************************************************
* Private Types
****************************************************************************/
/* This structure holds the state of the send operation until it can be
* operated upon by the event handler.
*/
struct send_s
{
FAR struct socket *snd_sock; /* Points to the parent socket structure */
FAR struct devif_callback_s *snd_cb; /* Reference to callback instance */
sem_t snd_sem; /* Used to wake up the waiting thread */
FAR const uint8_t *snd_buffer; /* Points to the buffer of data to send */
size_t snd_buflen; /* Number of bytes in the buffer to send */
ssize_t snd_sent; /* The number of bytes sent */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: psock_send_eventhandler
****************************************************************************/
static uint16_t psock_send_eventhandler(FAR struct net_driver_s *dev,
FAR void *pvpriv, uint16_t flags)
{
FAR struct send_s *pstate = pvpriv;
ninfo("flags: %04x sent: %zd\n", flags, pstate->snd_sent);
if (pstate)
{
/* Check if the outgoing packet is available. It may have been claimed
* by a send event handler serving a different thread -OR- if the
* output buffer currently contains unprocessed incoming data. In
* these cases we will just have to wait for the next polling cycle.
*/
if (dev->d_sndlen > 0 || (flags & PKT_NEWDATA) != 0)
{
/* Another thread has beat us sending data or the buffer is busy,
* Check for a timeout. If not timed out, wait for the next
* polling cycle and check again.
*/
/* No timeout. Just wait for the next polling cycle */
return flags;
}
/* It looks like we are good to send the data */
else
{
/* Copy the packet data into the device packet buffer and send it */
devif_send(dev, pstate->snd_buffer, pstate->snd_buflen, 0);
if (dev->d_sndlen == 0)
{
return flags;
}
pstate->snd_sent = pstate->snd_buflen;
/* Make sure no ARP request overwrites this ARP request. This
* flag will be cleared in arp_out().
*/
IFF_SET_NOARP(dev->d_flags);
}
/* Don't allow any further call backs. */
pstate->snd_cb->flags = 0;
pstate->snd_cb->priv = NULL;
pstate->snd_cb->event = NULL;
/* Wake up the waiting thread */
nxsem_post(&pstate->snd_sem);
}
return flags;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: pkt_sendmsg
*
* Description:
* The pkt_sendmsg() call may be used only when the packet socket is in
* a connected state (so that the intended recipient is known).
*
* Input Parameters:
* psock An instance of the internal socket structure.
* msg Message to send
* flags Send flags
*
* Returned Value:
* On success, returns the number of characters sent. On error, a negated
* errno value is returned (see sendmsg() for the complete list of return
* values.
*
****************************************************************************/
ssize_t pkt_sendmsg(FAR struct socket *psock, FAR struct msghdr *msg,
int flags)
{
FAR const void *buf = msg->msg_iov->iov_base;
size_t len = msg->msg_iov->iov_len;
FAR struct net_driver_s *dev;
struct send_s state;
int ret = OK;
/* Validity check, only single iov supported */
if (msg->msg_iovlen != 1)
{
return -ENOTSUP;
}
if (msg->msg_name != NULL)
{
/* pkt_sendto */
nerr("ERROR: sendto() not supported for raw packet sockets\n");
return -EAFNOSUPPORT;
}
/* Verify that the sockfd corresponds to valid, allocated socket */
if (psock == NULL || psock->s_conn == NULL)
{
return -EBADF;
}
/* Only SOCK_RAW is supported */
if (psock->s_type == SOCK_RAW)
{
/* EDESTADDRREQ. Signifies that the socket is not connection-mode and
* no peer address is set.
*/
return -EDESTADDRREQ;
}
/* Get the device driver that will service this transfer */
dev = pkt_find_device((FAR struct pkt_conn_s *)psock->s_conn);
if (dev == NULL)
{
return -ENODEV;
}
/* Perform the send operation */
/* Initialize the state structure. This is done with the network locked
* because we don't want anything to happen until we are ready.
*/
net_lock();
memset(&state, 0, sizeof(struct send_s));
nxsem_init(&state.snd_sem, 0, 0); /* Doesn't really fail */
state.snd_sock = psock; /* Socket descriptor to use */
state.snd_buflen = len; /* Number of bytes to send */
state.snd_buffer = buf; /* Buffer to send from */
if (len > 0)
{
FAR struct pkt_conn_s *conn = (FAR struct pkt_conn_s *)psock->s_conn;
/* Allocate resource to receive a callback */
state.snd_cb = pkt_callback_alloc(dev, conn);
if (state.snd_cb)
{
/* Set up the callback in the connection */
state.snd_cb->flags = PKT_POLL;
state.snd_cb->priv = (FAR void *)&state;
state.snd_cb->event = psock_send_eventhandler;
/* Notify the device driver that new TX data is available. */
netdev_txnotify_dev(dev);
/* Wait for the send to complete or an error to occur.
* net_sem_wait will also terminate if a signal is received.
*/
ret = net_sem_wait(&state.snd_sem);
/* Make sure that no further events are processed */
pkt_callback_free(dev, conn, state.snd_cb);
}
}
nxsem_destroy(&state.snd_sem);
net_unlock();
/* Check for errors. Errors are signalled by negative errno values
* for the send length
*/
if (state.snd_sent < 0)
{
return state.snd_sent;
}
/* If net_sem_wait failed, then we were probably reawakened by a signal.
* In this case, net_sem_wait will have returned negated errno
* appropriately.
*/
if (ret < 0)
{
return ret;
}
/* Return the number of bytes actually sent */
return state.snd_sent;
}
#endif /* CONFIG_NET && CONFIG_NET_PKT */
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