720 lines
21 KiB
C
720 lines
21 KiB
C
/****************************************************************************
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* net/tcp/tcp_send_unbuffered.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <inttypes.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/semaphore.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 "socket/socket.h"
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#include "inet/inet.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 "route/route.h"
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#include "tcp/tcp.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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/****************************************************************************
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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 when the TX poll event occurs.
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*/
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struct send_s
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{
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FAR struct tcp_conn_s *snd_conn; /* The TCP connection of interest */
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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_TCP_FAST_RETRANSMIT
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uint32_t snd_prev_ack; /* The previous ACKed seq number */
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#ifdef CONFIG_NET_TCP_WINDOW_SCALE
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uint32_t snd_prev_wnd; /* The advertised window in the last
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* incoming acknowledgment
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*/
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#else
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uint16_t snd_prev_wnd;
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#endif
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int snd_dup_acks; /* Duplicate ACK counter */
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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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* Name: 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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* Input Parameters:
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* dev - The structure of the network driver that caused the event
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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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* The network is locked.
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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 tcp_conn_s *conn)
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{
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/* Which domain does the socket support */
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if (conn->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 (conn->domain == PF_INET6) */
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{
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/* Select the IPv6 domain */
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tcp_ipv6_select(dev);
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}
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}
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#endif
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/****************************************************************************
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* Name: tcpsend_eventhandler
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*
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* Description:
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* This function is called to perform the actual send operation when
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* polled by the lower, device interfacing layer.
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*
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* Input Parameters:
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* dev The structure of the network driver that caused the event
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* pvpriv An instance of struct send_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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* None
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*
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* Assumptions:
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* The network is locked.
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*
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****************************************************************************/
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static uint16_t tcpsend_eventhandler(FAR struct net_driver_s *dev,
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FAR void *pvpriv, uint16_t flags)
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{
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FAR struct send_s *pstate = pvpriv;
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FAR struct tcp_conn_s *conn;
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DEBUGASSERT(pstate != NULL);
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/* Get the TCP connection pointer reliably from
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* the corresponding TCP socket.
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*/
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conn = pstate->snd_conn;
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DEBUGASSERT(conn != NULL);
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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 one 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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ninfo("flags: %04x acked: %" PRId32 " sent: %zd\n",
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flags, pstate->snd_acked, pstate->snd_sent);
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/* The TCP_ACKDATA, TCP_REXMIT and TCP_DISCONN_EVENTS flags are expected to
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* appear here strictly one at a time, except for the FIN + ACK case.
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*/
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DEBUGASSERT((flags & TCP_ACKDATA) == 0 ||
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(flags & TCP_REXMIT) == 0);
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DEBUGASSERT((flags & TCP_DISCONN_EVENTS) == 0 ||
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(flags & TCP_REXMIT) == 0);
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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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* This condition is located here for performance reasons
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* (TCP_ACKDATA is the most frequent event).
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*/
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if ((flags & TCP_ACKDATA) != 0)
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{
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uint32_t ackno;
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FAR struct tcp_hdr_s *tcp;
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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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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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tcp = TCPIPv6BUF;
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}
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#endif /* CONFIG_NET_IPv6 */
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/* The current acknowledgement number is the (relative) offset of the
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* next byte needed by the receiver. The snd_isn is the offset of the
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* first byte to send to the receiver. The difference is the number
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* of bytes to be acknowledged.
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*/
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ackno = tcp_getsequence(tcp->ackno);
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pstate->snd_acked = TCP_SEQ_SUB(ackno,
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pstate->snd_isn);
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ninfo("ACK: acked=%" PRId32 " sent=%zd buflen=%zu\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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#ifdef CONFIG_NET_TCP_FAST_RETRANSMIT
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/* Fast Retransmit (RFC 5681): an acknowledgment is considered a
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* "duplicate" when (a) the receiver of the ACK has outstanding data,
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* (b) the incoming acknowledgment carries no data, (c) the SYN and
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* FIN bits are both off, (d) the acknowledgment number is equal to
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* the greatest acknowledgment received on the given connection
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* and (e) the advertised window in the incoming acknowledgment equals
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* the advertised window in the last incoming acknowledgment.
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*/
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if (pstate->snd_acked < pstate->snd_sent &&
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(flags & TCP_NEWDATA) == 0 &&
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(tcp->flags & (TCP_SYN | TCP_FIN)) == 0 &&
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ackno == pstate->snd_prev_ack &&
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conn->snd_wnd == pstate->snd_prev_wnd)
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{
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if (++pstate->snd_dup_acks >= TCP_FAST_RETRANSMISSION_THRESH)
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{
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flags |= TCP_REXMIT;
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pstate->snd_dup_acks = 0;
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}
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}
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else
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{
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pstate->snd_dup_acks = 0;
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}
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pstate->snd_prev_ack = ackno;
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pstate->snd_prev_wnd = conn->snd_wnd;
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#endif
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}
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/* Check if we are being asked to retransmit data.
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* This condition is located here after TCP_ACKDATA for performance reasons
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* (TCP_REXMIT is less frequent than TCP_ACKDATA).
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*/
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if ((flags & TCP_REXMIT) != 0)
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{
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uint32_t sndlen;
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nwarn("WARNING: TCP_REXMIT\n");
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/* According to RFC 6298 (5.4), retransmit the earliest segment
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* that has not been acknowledged by the TCP receiver.
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*/
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/* Reconstruct the length of the earliest segment to be retransmitted */
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sndlen = pstate->snd_buflen - pstate->snd_acked;
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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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conn->rexmit_seq = pstate->snd_isn + pstate->snd_acked;
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#ifdef NEED_IPDOMAIN_SUPPORT
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/* If both IPv4 and IPv6 support are enabled, then we will need to
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* select which one to use when generating the outgoing packet.
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* If only one domain is selected, then the setup is already in
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* place and we need do nothing.
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*/
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tcpsend_ipselect(dev, conn);
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#endif
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/* Then set-up to send that amount of data. (this won't actually
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* happen until the polling cycle completes).
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*/
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devif_send(dev, &pstate->snd_buffer[pstate->snd_acked],
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sndlen, tcpip_hdrsize(conn));
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/* Continue waiting */
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return flags;
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}
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/* Check for a loss of connection.
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* This condition is located here after both the TCP_ACKDATA and TCP_REXMIT
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* because TCP_DISCONN_EVENTS is the least frequent event.
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*/
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else if ((flags & TCP_DISCONN_EVENTS) != 0)
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{
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ninfo("Lost connection\n");
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/* We could get here recursively through the callback actions of
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* tcp_lost_connection(). So don't repeat that action if we have
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* already been disconnected.
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*/
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if (_SS_ISCONNECTED(conn->sconn.s_flags))
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{
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/* Report not connected */
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tcp_lost_connection(conn, pstate->snd_cb, flags);
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}
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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 event 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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/* 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 (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->snd_wnd)
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{
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#ifdef NEED_IPDOMAIN_SUPPORT
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/* If both IPv4 and IPv6 support are enabled, then we will need to
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* select which one to use when generating the outgoing packet.
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* If only one domain is selected, then the setup is already in
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* place and we need do nothing.
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*/
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tcpsend_ipselect(dev, conn);
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#endif
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/* Then set-up to send that amount of data. (this won't actually
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* happen until the polling cycle completes).
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*/
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devif_send(dev, &pstate->snd_buffer[pstate->snd_sent],
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sndlen, tcpip_hdrsize(conn));
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if (dev->d_sndlen == 0)
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{
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return flags;
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}
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/* Update the amount of data sent (but not necessarily ACKed) */
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pstate->snd_sent += sndlen;
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ninfo("SEND: acked=%" PRId32 " sent=%zd buflen=%zu\n",
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pstate->snd_acked, pstate->snd_sent, pstate->snd_buflen);
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}
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else
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{
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nwarn("WARNING: Window full, wait for ack\n");
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}
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}
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/* Continue waiting */
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return flags;
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end_wait:
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/* Do not allow any further callbacks */
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DEBUGASSERT(pstate->snd_cb != NULL);
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pstate->snd_cb->flags = 0;
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pstate->snd_cb->priv = NULL;
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pstate->snd_cb->event = NULL;
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/* There are no outstanding, unacknowledged bytes */
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conn->tx_unacked = 0;
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/* Wake up the waiting thread */
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nxsem_post(&pstate->snd_sem);
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return flags;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: psock_tcp_send
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*
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* Description:
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* psock_tcp_send() call may be used only when the TCP socket is in a
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* connected state (so that the intended recipient is known).
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*
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* Input Parameters:
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* psock An instance of the 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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*
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* Returned Value:
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* On success, returns the number of characters sent. On error,
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* a negated errno value is returned.
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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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* 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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****************************************************************************/
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ssize_t psock_tcp_send(FAR struct socket *psock,
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FAR const void *buf, size_t len, int flags)
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{
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FAR struct tcp_conn_s *conn;
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struct send_s state;
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int ret = OK;
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/* Verify that the sockfd corresponds to valid, allocated socket */
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if (psock == NULL || psock->s_type != SOCK_STREAM ||
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psock->s_conn == NULL)
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{
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nerr("ERROR: Invalid socket\n");
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ret = -EBADF;
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goto errout;
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}
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conn = (FAR struct tcp_conn_s *)psock->s_conn;
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/* Check early if this is an un-connected socket, if so, then
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* return -ENOTCONN. Note, we will have to check this again, as we can't
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* guarantee the state won't change until we have the network locked.
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*/
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if (!_SS_ISCONNECTED(conn->sconn.s_flags))
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{
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nerr("ERROR: Not connected\n");
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ret = -ENOTCONN;
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goto errout;
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}
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/* Make sure that we have the IP address mapping */
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#if defined(CONFIG_NET_ARP_SEND) || defined(CONFIG_NET_ICMPv6_NEIGHBOR)
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|
#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)
|
|
{
|
|
nerr("ERROR: Not reachable\n");
|
|
ret = -ENETUNREACH;
|
|
goto errout;
|
|
}
|
|
#endif /* CONFIG_NET_ARP_SEND || CONFIG_NET_ICMPv6_NEIGHBOR */
|
|
|
|
/* Perform the TCP 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();
|
|
|
|
/* Now that we have the network locked, we need to check the connection
|
|
* state again to ensure the connection is still valid.
|
|
*/
|
|
|
|
if (!_SS_ISCONNECTED(conn->sconn.s_flags))
|
|
{
|
|
nerr("ERROR: No longer connected\n");
|
|
net_unlock();
|
|
ret = -ENOTCONN;
|
|
goto errout;
|
|
}
|
|
|
|
memset(&state, 0, sizeof(struct send_s));
|
|
nxsem_init(&state.snd_sem, 0, 0); /* Doesn't really fail */
|
|
|
|
state.snd_conn = conn; /* 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 */
|
|
|
|
ret = -ENOMEM; /* Assume allocation failure */
|
|
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->tx_unacked = 0;
|
|
|
|
/* 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_eventhandler;
|
|
|
|
/* Notify the device driver of the availability of TX data */
|
|
|
|
tcp_send_txnotify(psock, conn);
|
|
|
|
/* Wait for the send to complete or an error to occur: NOTES:
|
|
* net_lockedwait will also terminate if a signal is received.
|
|
*/
|
|
|
|
for (; ; )
|
|
{
|
|
uint32_t acked = state.snd_acked;
|
|
|
|
ret = net_timedwait(&state.snd_sem,
|
|
_SO_TIMEOUT(conn->sconn.s_sndtimeo));
|
|
if (ret != -ETIMEDOUT || acked == state.snd_acked)
|
|
{
|
|
if (ret == -ETIMEDOUT)
|
|
{
|
|
ret = -EAGAIN;
|
|
}
|
|
|
|
break; /* Timeout without any progress */
|
|
}
|
|
}
|
|
|
|
/* Make sure that no further events are processed */
|
|
|
|
tcp_callback_free(conn, state.snd_cb);
|
|
}
|
|
}
|
|
|
|
nxsem_destroy(&state.snd_sem);
|
|
net_unlock();
|
|
|
|
/* Check for a errors. Errors are signalled by negative errno values
|
|
* for the send length
|
|
*/
|
|
|
|
if (state.snd_sent < 0)
|
|
{
|
|
ret = state.snd_sent;
|
|
goto errout;
|
|
}
|
|
|
|
/* If net_timedwait failed, then we were probably reawakened by a signal.
|
|
* In this case, net_timedwait will have returned negated errno
|
|
* appropriately.
|
|
*/
|
|
|
|
if (ret < 0)
|
|
{
|
|
goto errout;
|
|
}
|
|
|
|
/* Return the number of bytes actually sent */
|
|
|
|
ret = state.snd_sent;
|
|
|
|
errout:
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: 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.
|
|
*
|
|
* Input Parameters:
|
|
* conn The TCP connection of interest
|
|
*
|
|
* Returned Value:
|
|
* OK (Always can send).
|
|
*
|
|
* Assumptions:
|
|
* None
|
|
*
|
|
****************************************************************************/
|
|
|
|
int psock_tcp_cansend(FAR struct tcp_conn_s *conn)
|
|
{
|
|
return OK;
|
|
}
|
|
|
|
#endif /* CONFIG_NET && CONFIG_NET_TCP && !CONFIG_NET_TCP_WRITE_BUFFERS */
|