df211ee46a
When a poll requesting POLLOUT happens, the poll should return immediately if a write will not block. This change adds that, as opposed to the old behaviour of blocking until a timer from the Ethernet driver eventually triggers the poll to complete. This is only implemented for buffered TCP. Unbuffered TCP should behave as before.
910 lines
27 KiB
C
910 lines
27 KiB
C
/****************************************************************************
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* net/tcp/tcp_send_unbuffered.c
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*
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* Copyright (C) 2007-2014, 2016 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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#if defined(CONFIG_NET) && defined(CONFIG_NET_TCP) && \
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!defined(CONFIG_NET_TCP_WRITE_BUFFERS)
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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 <stdbool.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 <arch/irq.h>
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#include <nuttx/clock.h>
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#include <nuttx/net/net.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/arp.h>
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#include <nuttx/net/tcp.h>
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#include "netdev/netdev.h"
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#include "devif/devif.h"
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#include "arp/arp.h"
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#include "icmpv6/icmpv6.h"
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#include "neighbor/neighbor.h"
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#include "tcp/tcp.h"
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#include "socket/socket.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* If both IPv4 and IPv6 support are both enabled, then we will need to build
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* in some additional domain selection support.
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*/
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#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
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# define NEED_IPDOMAIN_SUPPORT 1
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#endif
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#if defined(CONFIG_NET_TCP_SPLIT) && !defined(CONFIG_NET_TCP_SPLIT_SIZE)
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# define CONFIG_NET_TCP_SPLIT_SIZE 40
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#endif
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#define TCPIPv4BUF ((struct tcp_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv4_HDRLEN])
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#define TCPIPv6BUF ((struct tcp_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN])
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/* This structure holds the state of the send operation until it can be
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* operated upon from the interrupt level.
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*/
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struct send_s
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{
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FAR struct socket *snd_sock; /* Points to the parent socket structure */
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FAR struct devif_callback_s *snd_cb; /* Reference to callback instance */
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sem_t snd_sem; /* Used to wake up the waiting thread */
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FAR const uint8_t *snd_buffer; /* Points to the buffer of data to send */
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size_t snd_buflen; /* Number of bytes in the buffer to send */
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ssize_t snd_sent; /* The number of bytes sent */
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uint32_t snd_isn; /* Initial sequence number */
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uint32_t snd_acked; /* The number of bytes acked */
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#ifdef CONFIG_NET_SOCKOPTS
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systime_t snd_time; /* Last send time for determining timeout */
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#endif
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#if defined(CONFIG_NET_TCP_SPLIT)
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bool snd_odd; /* True: Odd packet in pair transaction */
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#endif
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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: send_timeout
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*
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* Description:
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* Check for send timeout.
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*
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* Parameters:
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* pstate send state structure
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*
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* Returned Value:
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* TRUE:timeout FALSE:no timeout
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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_SOCKOPTS
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static inline int send_timeout(FAR struct send_s *pstate)
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{
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FAR struct socket *psock;
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/* Check for a timeout configured via setsockopts(SO_SNDTIMEO).
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* If none... we well let the send wait forever.
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*/
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psock = pstate->snd_sock;
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if (psock && psock->s_sndtimeo != 0)
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{
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/* Check if the configured timeout has elapsed */
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return net_timeo(pstate->snd_time, psock->s_sndtimeo);
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}
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/* No timeout */
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return FALSE;
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}
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#endif /* CONFIG_NET_SOCKOPTS */
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/****************************************************************************
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* Function: tcpsend_ipselect
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*
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* Description:
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* If both IPv4 and IPv6 support are enabled, then we will need to select
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* which one to use when generating the outgoing packet. If only one
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* domain is selected, then the setup is already in place and we need do
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* nothing.
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*
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* Parameters:
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* dev - The structure of the network driver that caused the interrupt
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* pstate - sendto 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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* Running at the interrupt level
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*
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****************************************************************************/
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#ifdef NEED_IPDOMAIN_SUPPORT
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static inline void tcpsend_ipselect(FAR struct net_driver_s *dev,
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FAR struct send_s *pstate)
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{
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FAR struct socket *psock = pstate->snd_sock;
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DEBUGASSERT(psock);
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/* Which domain the the socket support */
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if (psock->s_domain == PF_INET)
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{
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/* Select the IPv4 domain */
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tcp_ipv4_select(dev);
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}
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else /* if (psock->s_domain == PF_INET6) */
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{
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/* Select the IPv6 domain */
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DEBUGASSERT(psock->s_domain == PF_INET6);
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tcp_ipv4_select(dev);
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}
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}
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#endif
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/****************************************************************************
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* Function: psock_send_addrchck
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*
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* Description:
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* Check if the destination IP address is in the IPv4 ARP or IPv6 Neighbor
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* tables. If not, then the send won't actually make it out... it will be
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* replaced with an ARP request (IPv4) or a Neighbor Solicitation (IPv6).
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*
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* NOTE 1: This could be an expensive check if there are a lot of
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* entries in the ARP or Neighbor tables.
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*
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* NOTE 2: If we are actually harvesting IP addresses on incoming IP
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* packets, then this check should not be necessary; the MAC mapping
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* should already be in the ARP table in many cases (IPv4 only).
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*
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* NOTE 3: If CONFIG_NET_ARP_SEND then we can be assured that the IP
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* address mapping is already in the ARP table.
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*
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* Parameters:
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* conn - The TCP connection 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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* Running at the interrupt level
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*
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****************************************************************************/
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#ifdef CONFIG_NET_ETHERNET
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static inline bool psock_send_addrchck(FAR struct tcp_conn_s *conn)
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{
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#ifdef CONFIG_NET_IPv4
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#ifdef CONFIG_NET_IPv6
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if (conn->domain == PF_INET)
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#endif
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{
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#if !defined(CONFIG_NET_ARP_IPIN) && !defined(CONFIG_NET_ARP_SEND)
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return (arp_find(conn->u.ipv4.raddr) != NULL);
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#else
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return true;
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#endif
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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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else
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#endif
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{
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#if !defined(CONFIG_NET_ICMPv6_NEIGHBOR)
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return (neighbor_findentry(conn->u.ipv6.raddr) != NULL);
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#else
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return true;
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#endif
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}
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#endif /* CONFIG_NET_IPv6 */
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}
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#else /* CONFIG_NET_ETHERNET */
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# define psock_send_addrchck(r) (true)
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#endif /* CONFIG_NET_ETHERNET */
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/****************************************************************************
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* Function: tcpsend_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 lower, device interfacing layer.
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*
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* Parameters:
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* dev The structure of the network driver that caused the interrupt
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* conn The connection structure associated with the socket
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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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* None
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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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static uint16_t tcpsend_interrupt(FAR struct net_driver_s *dev,
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FAR void *pvconn,
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FAR void *pvpriv, uint16_t flags)
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{
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FAR struct tcp_conn_s *conn = (FAR struct tcp_conn_s *)pvconn;
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FAR struct send_s *pstate = (FAR struct send_s *)pvpriv;
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#ifdef CONFIG_NETDEV_MULTINIC
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/* The TCP socket is connected and, hence, should be bound to a device.
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* Make sure that the polling device is the own that we are bound to.
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*/
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DEBUGASSERT(conn->dev != NULL);
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if (dev != conn->dev)
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{
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return flags;
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}
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#endif
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nllvdbg("flags: %04x acked: %d sent: %d\n",
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flags, pstate->snd_acked, pstate->snd_sent);
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/* If this packet contains an acknowledgement, then update the count of
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* acknowledged bytes.
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*/
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if ((flags & TCP_ACKDATA) != 0)
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{
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FAR struct tcp_hdr_s *tcp;
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/* Update the timeout */
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#ifdef CONFIG_NET_SOCKOPTS
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pstate->snd_time = clock_systimer();
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#endif
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/* Get the offset address of the TCP header */
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#ifdef CONFIG_NET_IPv4
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#ifdef CONFIG_NET_IPv6
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if (conn->domain == PF_INET)
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#endif
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{
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DEBUGASSERT(IFF_IS_IPv4(dev->d_flags));
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tcp = TCPIPv4BUF;
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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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else
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#endif
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{
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DEBUGASSERT(IFF_IS_IPv6(dev->d_flags));
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tcp = TCPIPv6BUF;
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}
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#endif /* CONFIG_NET_IPv6 */
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/* The current acknowledgement number number is the (relative) offset
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* of the of the next byte needed by the receiver. The snd_isn is the
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* offset of the first byte to send to the receiver. The difference
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* is the number of bytes to be acknowledged.
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*/
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pstate->snd_acked = tcp_getsequence(tcp->ackno) - pstate->snd_isn;
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nllvdbg("ACK: acked=%d sent=%d buflen=%d\n",
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pstate->snd_acked, pstate->snd_sent, pstate->snd_buflen);
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/* Have all of the bytes in the buffer been sent and acknowledged? */
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if (pstate->snd_acked >= pstate->snd_buflen)
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{
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/* Yes. Then pstate->snd_buflen should hold the number of bytes
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* actually sent.
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*/
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goto end_wait;
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}
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/* No.. fall through to send more data if necessary */
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}
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/* Check if we are being asked to retransmit data */
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else if ((flags & TCP_REXMIT) != 0)
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{
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/* Yes.. in this case, reset the number of bytes that have been sent
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* to the number of bytes that have been ACKed.
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*/
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pstate->snd_sent = pstate->snd_acked;
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#if defined(CONFIG_NET_TCP_SPLIT)
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/* Reset the even/odd indicator to even since we need to
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* retransmit.
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*/
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pstate->snd_odd = false;
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#endif
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/* Fall through to re-send data from the last that was ACKed */
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}
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/* Check for a loss of connection */
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else if ((flags & TCP_DISCONN_EVENTS) != 0)
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{
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/* Report not connected */
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nllvdbg("Lost connection\n");
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net_lostconnection(pstate->snd_sock, flags);
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pstate->snd_sent = -ENOTCONN;
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goto end_wait;
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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).
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*/
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#if 0 /* We can't really support multiple senders on the same TCP socket */
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else if (dev->d_sndlen > 0)
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{
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/* Another thread has beat us sending data, wait for the next poll */
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return flags;
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}
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#endif
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/* We get here if (1) not all of the data has been ACKed, (2) we have been
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* asked to retransmit data, (3) the connection is still healthy, and (4)
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* the outgoing packet is available for our use. In this case, we are
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* now free to send more data to receiver -- UNLESS the buffer contains
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* unprocessed incoming data. In that event, we will have to wait for the
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* next polling cycle.
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*/
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if ((flags & TCP_NEWDATA) == 0 && pstate->snd_sent < pstate->snd_buflen)
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{
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uint32_t seqno;
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/* Get the amount of data that we can send in the next packet */
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uint32_t sndlen = pstate->snd_buflen - pstate->snd_sent;
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#if defined(CONFIG_NET_TCP_SPLIT)
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/* RFC 1122 states that a host may delay ACKing for up to 500ms but
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* must respond to every second segment). This logic here will trick
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* the RFC 1122 recipient into responding sooner. This logic will be
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* activated if:
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*
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* 1. An even number of packets has been send (where zero is an even
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* number),
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* 2. There is more data be sent (more than or equal to
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* CONFIG_NET_TCP_SPLIT_SIZE), but
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* 3. Not enough data for two packets.
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*
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* Then we will split the remaining, single packet into two partial
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* packets. This will stimulate the RFC 1122 peer to ACK sooner.
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*
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* Don't try to split very small packets (less than CONFIG_NET_TCP_SPLIT_SIZE).
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* Only the first even packet and the last odd packets could have
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* sndlen less than CONFIG_NET_TCP_SPLIT_SIZE. The value of sndlen on
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* the last even packet is guaranteed to be at least MSS/2 by the
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* logic below.
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*/
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if (sndlen >= CONFIG_NET_TCP_SPLIT_SIZE)
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{
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/* sndlen is the number of bytes remaining to be sent.
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* conn->mss will provide the number of bytes that can sent
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* in one packet. The difference, then, is the number of bytes
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* that would be sent in the next packet after this one.
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*/
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int32_t next_sndlen = sndlen - conn->mss;
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/* Is this the even packet in the packet pair transaction? */
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if (!pstate->snd_odd)
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{
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/* next_sndlen <= 0 means that the entire remaining data
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* could fit into this single packet. This is condition
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* in which we must do the split.
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*/
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if (next_sndlen <= 0)
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{
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/* Split so that there will be an odd packet. Here
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* we know that 0 < sndlen <= MSS
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*/
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sndlen = (sndlen / 2) + 1;
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}
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}
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/* No... this is the odd packet in the packet pair transaction */
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else
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{
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/* Will there be another (even) packet afer this one?
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* (next_sndlen > 0) Will the split condition occur on that
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* next, even packet? ((next_sndlen - conn->mss) < 0) If
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* so, then perform the split now to avoid the case where the
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* byte count is less than CONFIG_NET_TCP_SPLIT_SIZE on the
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* next pair.
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*/
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if (next_sndlen > 0 && (next_sndlen - conn->mss) < 0)
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{
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/* Here, we know that sndlen must be MSS < sndlen <= 2*MSS
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* and so (sndlen / 2) is <= MSS.
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*/
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sndlen /= 2;
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}
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}
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}
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/* Toggle the even/odd indicator */
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pstate->snd_odd ^= true;
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#endif /* CONFIG_NET_TCP_SPLIT */
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if (sndlen > conn->mss)
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{
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sndlen = conn->mss;
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}
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/* Check if we have "space" in the window */
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if ((pstate->snd_sent - pstate->snd_acked + sndlen) < conn->winsize)
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{
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/* Set the sequence number for this packet. NOTE: uIP updates
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* sndseq on receipt of ACK *before* this function is called. In that
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* case sndseq will point to the next unacknowledged byte (which might
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* have already been sent). We will overwrite the value of sndseq
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* here before the packet is sent.
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*/
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seqno = pstate->snd_sent + pstate->snd_isn;
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nllvdbg("SEND: sndseq %08x->%08x\n", conn->sndseq, seqno);
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tcp_setsequence(conn->sndseq, seqno);
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#ifdef NEED_IPDOMAIN_SUPPORT
|
|
/* If both IPv4 and IPv6 support are enabled, then we will need to
|
|
* select which one to use when generating the outgoing packet.
|
|
* If only one domain is selected, then the setup is already in
|
|
* place and we need do nothing.
|
|
*/
|
|
|
|
tcpsend_ipselect(dev, pstate);
|
|
#endif
|
|
/* Then set-up to send that amount of data. (this won't actually
|
|
* happen until the polling cycle completes).
|
|
*/
|
|
|
|
devif_send(dev, &pstate->snd_buffer[pstate->snd_sent], sndlen);
|
|
|
|
/* Check if the destination IP address is in the ARP or Neighbor
|
|
* table. If not, then the send won't actually make it out... it
|
|
* will be replaced with an ARP request or Neighbor Solicitation.
|
|
*/
|
|
|
|
if (pstate->snd_sent != 0 || psock_send_addrchck(conn))
|
|
{
|
|
/* Update the amount of data sent (but not necessarily ACKed) */
|
|
|
|
pstate->snd_sent += sndlen;
|
|
nllvdbg("SEND: acked=%d sent=%d buflen=%d\n",
|
|
pstate->snd_acked, pstate->snd_sent, pstate->snd_buflen);
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_NET_SOCKOPTS
|
|
/* All data has been sent and we are just waiting for ACK or re-transmit
|
|
* indications to complete the send. Check for a timeout.
|
|
*/
|
|
|
|
if (send_timeout(pstate))
|
|
{
|
|
/* Yes.. report the timeout */
|
|
|
|
nlldbg("SEND timeout\n");
|
|
pstate->snd_sent = -ETIMEDOUT;
|
|
goto end_wait;
|
|
}
|
|
#endif /* CONFIG_NET_SOCKOPTS */
|
|
|
|
/* Continue waiting */
|
|
|
|
return flags;
|
|
|
|
end_wait:
|
|
/* Do not allow any further callbacks */
|
|
|
|
pstate->snd_cb->flags = 0;
|
|
pstate->snd_cb->priv = NULL;
|
|
pstate->snd_cb->event = NULL;
|
|
|
|
/* There are no outstanding, unacknowledged bytes */
|
|
|
|
conn->unacked = 0;
|
|
|
|
/* Wake up the waiting thread */
|
|
|
|
sem_post(&pstate->snd_sem);
|
|
return flags;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Function: send_txnotify
|
|
*
|
|
* Description:
|
|
* Notify the appropriate device driver that we are have data ready to
|
|
* be send (TCP)
|
|
*
|
|
* Parameters:
|
|
* psock - Socket state structure
|
|
* conn - The TCP connection structure
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
****************************************************************************/
|
|
|
|
static inline void send_txnotify(FAR struct socket *psock,
|
|
FAR struct tcp_conn_s *conn)
|
|
{
|
|
#ifdef CONFIG_NET_IPv4
|
|
#ifdef CONFIG_NET_IPv6
|
|
/* If both IPv4 and IPv6 support are enabled, then we will need to select
|
|
* the device driver using the appropriate IP domain.
|
|
*/
|
|
|
|
if (psock->s_domain == PF_INET)
|
|
#endif
|
|
{
|
|
/* Notify the device driver that send data is available */
|
|
|
|
#ifdef CONFIG_NETDEV_MULTINIC
|
|
netdev_ipv4_txnotify(conn->u.ipv4.laddr, conn->u.ipv4.raddr);
|
|
#else
|
|
netdev_ipv4_txnotify(conn->u.ipv4.raddr);
|
|
#endif
|
|
}
|
|
#endif /* CONFIG_NET_IPv4 */
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
#ifdef CONFIG_NET_IPv4
|
|
else /* if (psock->s_domain == PF_INET6) */
|
|
#endif /* CONFIG_NET_IPv4 */
|
|
{
|
|
/* Notify the device driver that send data is available */
|
|
|
|
DEBUGASSERT(psock->s_domain == PF_INET6);
|
|
#ifdef CONFIG_NETDEV_MULTINIC
|
|
netdev_ipv6_txnotify(conn->u.ipv6.laddr, conn->u.ipv6.raddr);
|
|
#else
|
|
netdev_ipv6_txnotify(conn->u.ipv6.raddr);
|
|
#endif
|
|
}
|
|
#endif /* CONFIG_NET_IPv6 */
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Function: psock_tcp_send
|
|
*
|
|
* Description:
|
|
* psock_tcp_send() call may be used only when the TCP socket is in a
|
|
* connected state (so that the intended recipient is known).
|
|
*
|
|
* Parameters:
|
|
* psock An instance of the internal socket structure.
|
|
* buf Data to send
|
|
* len Length of data to send
|
|
*
|
|
* Returned Value:
|
|
* On success, returns the number of characters sent. On error,
|
|
* -1 is returned, and errno is set appropriately:
|
|
*
|
|
* EAGAIN or EWOULDBLOCK
|
|
* The socket is marked non-blocking and the requested operation
|
|
* would block.
|
|
* EBADF
|
|
* An invalid descriptor was specified.
|
|
* ECONNRESET
|
|
* Connection reset by peer.
|
|
* EDESTADDRREQ
|
|
* The socket is not connection-mode, and no peer address is set.
|
|
* EFAULT
|
|
* An invalid user space address was specified for a parameter.
|
|
* EINTR
|
|
* A signal occurred before any data was transmitted.
|
|
* EINVAL
|
|
* Invalid argument passed.
|
|
* EISCONN
|
|
* The connection-mode socket was connected already but a recipient
|
|
* was specified. (Now either this error is returned, or the recipient
|
|
* specification is ignored.)
|
|
* EMSGSIZE
|
|
* The socket type requires that message be sent atomically, and the
|
|
* size of the message to be sent made this impossible.
|
|
* ENOBUFS
|
|
* The output queue for a network interface was full. This generally
|
|
* indicates that the interface has stopped sending, but may be
|
|
* caused by transient congestion.
|
|
* ENOMEM
|
|
* No memory available.
|
|
* ENOTCONN
|
|
* The socket is not connected, and no target has been given.
|
|
* ENOTSOCK
|
|
* The argument s is not a socket.
|
|
* EPIPE
|
|
* The local end has been shut down on a connection oriented socket.
|
|
* In this case the process will also receive a SIGPIPE unless
|
|
* MSG_NOSIGNAL is set.
|
|
*
|
|
* Assumptions:
|
|
*
|
|
****************************************************************************/
|
|
|
|
ssize_t psock_tcp_send(FAR struct socket *psock,
|
|
FAR const void *buf, size_t len)
|
|
{
|
|
FAR struct tcp_conn_s *conn = (FAR struct tcp_conn_s *)psock->s_conn;
|
|
struct send_s state;
|
|
net_lock_t save;
|
|
int err;
|
|
int ret = OK;
|
|
|
|
/* Verify that the sockfd corresponds to valid, allocated socket */
|
|
|
|
if (!psock || psock->s_crefs <= 0)
|
|
{
|
|
ndbg("ERROR: Invalid socket\n");
|
|
err = EBADF;
|
|
goto errout;
|
|
}
|
|
|
|
/* If this is an un-connected socket, then return ENOTCONN */
|
|
|
|
if (psock->s_type != SOCK_STREAM || !_SS_ISCONNECTED(psock->s_flags))
|
|
{
|
|
ndbg("ERROR: Not connected\n");
|
|
err = ENOTCONN;
|
|
goto errout;
|
|
}
|
|
|
|
/* Make sure that we have the IP address mapping */
|
|
|
|
conn = (FAR struct tcp_conn_s *)psock->s_conn;
|
|
DEBUGASSERT(conn);
|
|
|
|
#if defined(CONFIG_NET_ARP_SEND) || defined(CONFIG_NET_ICMPv6_NEIGHBOR)
|
|
#ifdef CONFIG_NET_ARP_SEND
|
|
#ifdef CONFIG_NET_ICMPv6_NEIGHBOR
|
|
if (psock->s_domain == PF_INET)
|
|
#endif
|
|
{
|
|
/* Make sure that the IP address mapping is in the ARP table */
|
|
|
|
ret = arp_send(conn->u.ipv4.raddr);
|
|
}
|
|
#endif /* CONFIG_NET_ARP_SEND */
|
|
|
|
|
|
#ifdef CONFIG_NET_ICMPv6_NEIGHBOR
|
|
#ifdef CONFIG_NET_ARP_SEND
|
|
else
|
|
#endif
|
|
{
|
|
/* Make sure that the IP address mapping is in the Neighbor Table */
|
|
|
|
ret = icmpv6_neighbor(conn->u.ipv6.raddr);
|
|
}
|
|
#endif /* CONFIG_NET_ICMPv6_NEIGHBOR */
|
|
|
|
/* Did we successfully get the address mapping? */
|
|
|
|
if (ret < 0)
|
|
{
|
|
ndbg("ERROR: Not reachable\n");
|
|
err = ENETUNREACH;
|
|
goto errout;
|
|
}
|
|
#endif /* CONFIG_NET_ARP_SEND || CONFIG_NET_ICMPv6_NEIGHBOR */
|
|
|
|
/* Set the socket state to sending */
|
|
|
|
psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_SEND);
|
|
|
|
/* Perform the TCP send operation */
|
|
|
|
/* Initialize the state structure. This is done with interrupts
|
|
* disabled because we don't want anything to happen until we
|
|
* are ready.
|
|
*/
|
|
|
|
save = net_lock();
|
|
memset(&state, 0, sizeof(struct send_s));
|
|
(void)sem_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)
|
|
{
|
|
/* Allocate resources to receive a callback */
|
|
|
|
state.snd_cb = tcp_callback_alloc(conn);
|
|
if (state.snd_cb)
|
|
{
|
|
/* Get the initial sequence number that will be used */
|
|
|
|
state.snd_isn = tcp_getsequence(conn->sndseq);
|
|
|
|
/* There is no outstanding, unacknowledged data after this
|
|
* initial sequence number.
|
|
*/
|
|
|
|
conn->unacked = 0;
|
|
|
|
/* Set the initial time for calculating timeouts */
|
|
|
|
#ifdef CONFIG_NET_SOCKOPTS
|
|
state.snd_time = clock_systimer();
|
|
#endif
|
|
/* Set up the callback in the connection */
|
|
|
|
state.snd_cb->flags = (TCP_ACKDATA | TCP_REXMIT | TCP_POLL |
|
|
TCP_DISCONN_EVENTS);
|
|
state.snd_cb->priv = (FAR void *)&state;
|
|
state.snd_cb->event = tcpsend_interrupt;
|
|
|
|
/* Notify the device driver of the availability of TX data */
|
|
|
|
send_txnotify(psock, conn);
|
|
|
|
/* Wait for the send to complete or an error to occur: NOTES: (1)
|
|
* net_lockedwait will also terminate if a signal is received, (2) interrupts
|
|
* may be disabled! They will be re-enabled while the task sleeps and
|
|
* automatically re-enabled when the task restarts.
|
|
*/
|
|
|
|
ret = net_lockedwait(&state.snd_sem);
|
|
|
|
/* Make sure that no further interrupts are processed */
|
|
|
|
tcp_callback_free(conn, state.snd_cb);
|
|
}
|
|
}
|
|
|
|
sem_destroy(&state.snd_sem);
|
|
net_unlock(save);
|
|
|
|
/* Set the socket state to idle */
|
|
|
|
psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_IDLE);
|
|
|
|
/* Check for a errors. Errors are signalled by negative errno values
|
|
* for the send length
|
|
*/
|
|
|
|
if (state.snd_sent < 0)
|
|
{
|
|
err = state.snd_sent;
|
|
goto errout;
|
|
}
|
|
|
|
/* If net_lockedwait failed, then we were probably reawakened by a signal. In
|
|
* this case, net_lockedwait will have set errno appropriately.
|
|
*/
|
|
|
|
if (ret < 0)
|
|
{
|
|
err = -ret;
|
|
goto errout;
|
|
}
|
|
|
|
/* Return the number of bytes actually sent */
|
|
|
|
return state.snd_sent;
|
|
|
|
errout:
|
|
set_errno(err);
|
|
return ERROR;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Function: psock_tcp_cansend
|
|
*
|
|
* Description:
|
|
* psock_tcp_cansend() returns a value indicating if a write to the socket
|
|
* would block. It is still possible that the write may block if another
|
|
* write occurs first.
|
|
*
|
|
* Parameters:
|
|
* psock An instance of the internal socket structure.
|
|
*
|
|
* Returned Value:
|
|
* OK (Function not implemented).
|
|
*
|
|
* Assumptions:
|
|
* None
|
|
*
|
|
****************************************************************************/
|
|
|
|
int psock_tcp_cansend(FAR struct socket *psock)
|
|
{
|
|
/* TODO: return OK unless someone is waiting for a packet to send */
|
|
|
|
return OK;
|
|
}
|
|
|
|
#endif /* CONFIG_NET && CONFIG_NET_TCP && !CONFIG_NET_TCP_WRITE_BUFFERS */
|