static void connection_event(FAR struct uip_conn *conn, uint16_t flags)
{
  FAR struct socket *psock = (FAR struct socket *)conn->connection_private;

  if (psock)
    {
      nllvdbg("flags: %04x s_flags: %02x\n", flags, psock->s_flags);

      /* UIP_CLOSE, UIP_ABORT, or UIP_TIMEDOUT: Loss-of-connection events */

      if ((flags & (UIP_CLOSE|UIP_ABORT|UIP_TIMEDOUT)) != 0)
        {
          net_lostconnection(psock, flags);
        }

      /* UIP_CONNECTED: The socket is successfully connected */

      else if ((flags & UIP_CONNECTED) != 0)
        {
          /* Indicate that the socket is now connected */

          psock->s_flags |= _SF_CONNECTED;
          psock->s_flags &= ~_SF_CLOSED;
        }
    }
}
Ejemplo n.º 2
0
static uint16_t ack_interrupt(FAR struct net_driver_s *dev, FAR void *pvconn,
                              FAR void *pvpriv, uint16_t flags)
{
  FAR struct sendfile_s *pstate = (FAR struct sendfile_s *)pvpriv;

  nllvdbg("flags: %04x\n", flags);

  if ((flags & TCP_ACKDATA) != 0)
    {
#ifdef CONFIG_NET_SOCKOPTS
      /* Update the timeout */

      pstate->snd_time = clock_systimer();
#endif

      /* The current acknowledgement number number is the (relative) offset
       * of the of the next byte needed by the receiver.  The snd_isn is the
       * offset of the first byte to send to the receiver.  The difference
       * is the number of bytes to be acknowledged.
       */

      pstate->snd_acked = tcp_getsequence(TCPBUF->ackno) - pstate->snd_isn;
      nllvdbg("ACK: acked=%d sent=%d flen=%d\n",
             pstate->snd_acked, pstate->snd_sent, pstate->snd_flen);

      dev->d_sndlen = 0;

      flags &= ~TCP_ACKDATA;
    }
  else if ((flags & TCP_REXMIT) != 0)
    {
      nlldbg("REXMIT\n");

      /* Yes.. in this case, reset the number of bytes that have been sent
       * to the number of bytes that have been ACKed.
       */

      pstate->snd_sent = pstate->snd_acked;
    }

  /* Check for a loss of connection */

  else if ((flags & (TCP_CLOSE | TCP_ABORT | TCP_TIMEDOUT)) != 0)
    {
      /* Report not connected */

      nlldbg("Lost connection\n");

      net_lostconnection(pstate->snd_sock, flags);
      pstate->snd_sent = -ENOTCONN;
    }

  /* Wake up the waiting thread */

  sem_post(&pstate->snd_sem);

  return flags;
}
Ejemplo n.º 3
0
static uint16_t tcp_poll_interrupt(FAR struct net_driver_s *dev, FAR void *conn,
                                   FAR void *pvpriv, uint16_t flags)
{
  FAR struct tcp_poll_s *info = (FAR struct tcp_poll_s *)pvpriv;

  nllvdbg("flags: %04x\n", flags);

  DEBUGASSERT(!info || (info->psock && info->fds));

  /* 'priv' might be null in some race conditions (?) */

  if (info)
    {
      pollevent_t eventset = 0;

      /* Check for data or connection availability events. */

      if ((flags & (TCP_NEWDATA | TCP_BACKLOG)) != 0)
        {
          eventset |= POLLIN & info->fds->events;
        }

      /* A poll is a sign that we are free to send data. */

      if ((flags & TCP_POLL) != 0)
        {
          eventset |= (POLLOUT & info->fds->events);
        }

      /* Check for a loss of connection events. */

      if ((flags & (TCP_CLOSE | TCP_ABORT | TCP_TIMEDOUT)) != 0)
        {
          /* Marki that the connection has been lost */

          net_lostconnection(info->psock, flags);
          eventset |= (POLLERR | POLLHUP);
        }

      /* Awaken the caller of poll() is requested event occurred. */

      if (eventset)
        {
          info->fds->revents |= eventset;
          sem_post(info->fds->sem);
        }
    }

  return flags;
}
Ejemplo n.º 4
0
static uint16_t tcpsend_interrupt(FAR struct net_driver_s *dev,
                                  FAR void *pvconn,
                                  FAR void *pvpriv, uint16_t flags)
{
  FAR struct tcp_conn_s *conn = (FAR struct tcp_conn_s *)pvconn;
  FAR struct send_s *pstate = (FAR struct send_s *)pvpriv;

#ifdef CONFIG_NETDEV_MULTINIC
  /* The TCP socket is connected and, hence, should be bound to a device.
   * Make sure that the polling device is the one that we are bound to.
   */

  DEBUGASSERT(conn->dev != NULL);
  if (dev != conn->dev)
    {
      return flags;
    }
#endif

  nllvdbg("flags: %04x acked: %d sent: %d\n",
          flags, pstate->snd_acked, pstate->snd_sent);

  /* If this packet contains an acknowledgement, then update the count of
   * acknowledged bytes.
   */

  if ((flags & TCP_ACKDATA) != 0)
    {
      FAR struct tcp_hdr_s *tcp;

      /* Update the timeout */

#ifdef CONFIG_NET_SOCKOPTS
      pstate->snd_time = clock_systimer();
#endif

      /* Get the offset address of the TCP header */

#ifdef CONFIG_NET_IPv4
#ifdef CONFIG_NET_IPv6
      if (conn->domain == PF_INET)
#endif
        {
          DEBUGASSERT(IFF_IS_IPv4(dev->d_flags));
          tcp = TCPIPv4BUF;
        }
#endif /* CONFIG_NET_IPv4 */

#ifdef CONFIG_NET_IPv6
#ifdef CONFIG_NET_IPv4
      else
#endif
        {
          DEBUGASSERT(IFF_IS_IPv6(dev->d_flags));
          tcp = TCPIPv6BUF;
        }
#endif /* CONFIG_NET_IPv6 */

      /* The current acknowledgement number number is the (relative) offset
       * of the of the next byte needed by the receiver.  The snd_isn is the
       * offset of the first byte to send to the receiver.  The difference
       * is the number of bytes to be acknowledged.
       */

      pstate->snd_acked = tcp_getsequence(tcp->ackno) - pstate->snd_isn;
      nllvdbg("ACK: acked=%d sent=%d buflen=%d\n",
              pstate->snd_acked, pstate->snd_sent, pstate->snd_buflen);

      /* Have all of the bytes in the buffer been sent and acknowledged? */

      if (pstate->snd_acked >= pstate->snd_buflen)
        {
          /* Yes.  Then pstate->snd_buflen should hold the number of bytes
           * actually sent.
           */

          goto end_wait;
        }

      /* No.. fall through to send more data if necessary */
    }

  /* Check if we are being asked to retransmit data */

  else if ((flags & TCP_REXMIT) != 0)
    {
      /* Yes.. in this case, reset the number of bytes that have been sent
       * to the number of bytes that have been ACKed.
       */

      pstate->snd_sent = pstate->snd_acked;

#if defined(CONFIG_NET_TCP_SPLIT)
      /* Reset the even/odd indicator to even since we need to
       * retransmit.
       */

      pstate->snd_odd = false;
#endif

      /* Fall through to re-send data from the last that was ACKed */
    }

  /* Check for a loss of connection */

  else if ((flags & TCP_DISCONN_EVENTS) != 0)
    {
      /* Report not connected */

      nllvdbg("Lost connection\n");

      net_lostconnection(pstate->snd_sock, flags);
      pstate->snd_sent = -ENOTCONN;
      goto end_wait;
    }

  /* Check if the outgoing packet is available (it may have been claimed
   * by a sendto interrupt serving a different thread).
   */

#if 0 /* We can't really support multiple senders on the same TCP socket */
  else if (dev->d_sndlen > 0)
    {
      /* Another thread has beat us sending data, wait for the next poll */

      return flags;
    }
#endif

  /* We get here if (1) not all of the data has been ACKed, (2) we have been
   * asked to retransmit data, (3) the connection is still healthy, and (4)
   * the outgoing packet is available for our use.  In this case, we are
   * now free to send more data to receiver -- UNLESS the buffer contains
   * unprocessed incoming data.  In that event, we will have to wait for the
   * next polling cycle.
   */

  if ((flags & TCP_NEWDATA) == 0 && pstate->snd_sent < pstate->snd_buflen)
    {
      uint32_t seqno;

      /* Get the amount of data that we can send in the next packet */

      uint32_t sndlen = pstate->snd_buflen - pstate->snd_sent;

#if defined(CONFIG_NET_TCP_SPLIT)

      /* RFC 1122 states that a host may delay ACKing for up to 500ms but
       * must respond to every second  segment).  This logic here will trick
       * the RFC 1122 recipient into responding sooner.  This logic will be
       * activated if:
       *
       *   1. An even number of packets has been send (where zero is an even
       *      number),
       *   2. There is more data be sent (more than or equal to
       *      CONFIG_NET_TCP_SPLIT_SIZE), but
       *   3. Not enough data for two packets.
       *
       * Then we will split the remaining, single packet into two partial
       * packets.  This will stimulate the RFC 1122 peer to ACK sooner.
       *
       * Don't try to split very small packets (less than CONFIG_NET_TCP_SPLIT_SIZE).
       * Only the first even packet and the last odd packets could have
       * sndlen less than CONFIG_NET_TCP_SPLIT_SIZE.  The value of sndlen on
       * the last even packet is guaranteed to be at least MSS/2 by the
       * logic below.
       */

      if (sndlen >= CONFIG_NET_TCP_SPLIT_SIZE)
        {
          /* sndlen is the number of bytes remaining to be sent.
           * conn->mss will provide the number of bytes that can sent
           * in one packet.  The difference, then, is the number of bytes
           * that would be sent in the next packet after this one.
           */

          int32_t next_sndlen = sndlen - conn->mss;

          /*  Is this the even packet in the packet pair transaction? */

          if (!pstate->snd_odd)
            {
              /* next_sndlen <= 0 means that the entire remaining data
               * could fit into this single packet.  This is condition
               * in which we must do the split.
               */

              if (next_sndlen <= 0)
                {
                  /* Split so that there will be an odd packet.  Here
                   * we know that 0 < sndlen <= MSS
                   */

                  sndlen = (sndlen / 2) + 1;
                }
            }

          /* No... this is the odd packet in the packet pair transaction */

          else
            {
              /* Will there be another (even) packet afer this one?
               * (next_sndlen > 0)  Will the split condition occur on that
               * next, even packet? ((next_sndlen - conn->mss) < 0) If
               * so, then perform the split now to avoid the case where the
               * byte count is less than CONFIG_NET_TCP_SPLIT_SIZE on the
               * next pair.
               */

              if (next_sndlen > 0 && (next_sndlen - conn->mss) < 0)
                {
                  /* Here, we know that sndlen must be MSS < sndlen <= 2*MSS
                   * and so (sndlen / 2) is <= MSS.
                   */

                  sndlen /= 2;
                }
            }
        }

      /* Toggle the even/odd indicator */

      pstate->snd_odd ^= true;

#endif /* CONFIG_NET_TCP_SPLIT */

      if (sndlen > conn->mss)
        {
          sndlen = conn->mss;
        }

      /* Check if we have "space" in the window */

      if ((pstate->snd_sent - pstate->snd_acked + sndlen) < conn->winsize)
        {
          /* Set the sequence number for this packet.  NOTE:  The network updates
           * sndseq on receipt of ACK *before* this function is called.  In that
           * case sndseq will point to the next unacknowledged byte (which might
           * have already been sent).  We will overwrite the value of sndseq
           * here before the packet is sent.
           */

          seqno = pstate->snd_sent + pstate->snd_isn;
          nllvdbg("SEND: sndseq %08x->%08x\n", conn->sndseq, seqno);
          tcp_setsequence(conn->sndseq, seqno);

#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;
}
Ejemplo n.º 5
0
static uint16_t psock_send_interrupt(FAR struct net_driver_s *dev,
                                     FAR void *pvconn, FAR void *pvpriv,
                                     uint16_t flags)
{
    FAR struct tcp_conn_s *conn = (FAR struct tcp_conn_s *)pvconn;
    FAR struct socket *psock = (FAR struct socket *)pvpriv;

    nllvdbg("flags: %04x\n", flags);

    /* If this packet contains an acknowledgement, then update the count of
     * acknowledged bytes.
     */

    if ((flags & TCP_ACKDATA) != 0)
    {
        FAR struct tcp_wrbuffer_s *wrb;
        FAR sq_entry_t *entry;
        FAR sq_entry_t *next;
        uint32_t ackno;

        ackno = tcp_getsequence(TCPBUF->ackno);
        nllvdbg("ACK: ackno=%u flags=%04x\n", ackno, flags);

        /* Look at every write buffer in the unacked_q.  The unacked_q
         * holds write buffers that have been entirely sent, but which
         * have not yet been ACKed.
         */

        for (entry = sq_peek(&conn->unacked_q); entry; entry = next)
        {
            uint32_t lastseq;

            /* Check of some or all of this write buffer has been ACKed. */

            next = sq_next(entry);
            wrb = (FAR struct tcp_wrbuffer_s*)entry;

            /* If the ACKed sequence number is greater than the start
             * sequence number of the write buffer, then some or all of
             * the write buffer has been ACKed.
             */

            if (ackno > WRB_SEQNO(wrb))
            {
                /* Get the sequence number at the end of the data */

                lastseq = WRB_SEQNO(wrb) + WRB_PKTLEN(wrb);
                nllvdbg("ACK: wrb=%p seqno=%u lastseq=%u pktlen=%u ackno=%u\n",
                        wrb, WRB_SEQNO(wrb), lastseq, WRB_PKTLEN(wrb), ackno);

                /* Has the entire buffer been ACKed? */

                if (ackno >= lastseq)
                {
                    nllvdbg("ACK: wrb=%p Freeing write buffer\n", wrb);

                    /* Yes... Remove the write buffer from ACK waiting queue */

                    sq_rem(entry, &conn->unacked_q);

                    /* And return the write buffer to the pool of free buffers */

                    tcp_wrbuffer_release(wrb);
                }
                else
                {
                    unsigned int trimlen;

                    /* No, then just trim the ACKed bytes from the beginning
                     * of the write buffer.  This will free up some I/O buffers
                     * that can be reused while are still sending the last
                     * buffers in the chain.
                     */

                    trimlen = ackno - WRB_SEQNO(wrb);
                    if (trimlen > WRB_SENT(wrb))
                    {
                        /* More data has been ACKed then we have sent? */

                        trimlen = WRB_SENT(wrb);
                    }

                    nllvdbg("ACK: wrb=%p trim %u bytes\n", wrb, trimlen);

                    WRB_TRIM(wrb, trimlen);
                    WRB_SEQNO(wrb) = ackno;
                    WRB_SENT(wrb) -= trimlen;

                    /* Set the new sequence number for what remains */

                    nllvdbg("ACK: wrb=%p seqno=%u pktlen=%u\n",
                            wrb, WRB_SEQNO(wrb), WRB_PKTLEN(wrb));
                }
            }
        }

        /* A special case is the head of the write_q which may be partially
         * sent and so can still have un-ACKed bytes that could get ACKed
         * before the entire write buffer has even been sent.
         */

        wrb = (FAR struct tcp_wrbuffer_s*)sq_peek(&conn->write_q);
        if (wrb && WRB_SENT(wrb) > 0 && ackno > WRB_SEQNO(wrb))
        {
            uint32_t nacked;

            /* Number of bytes that were ACKed */

            nacked = ackno - WRB_SEQNO(wrb);
            if (nacked > WRB_SENT(wrb))
            {
                /* More data has been ACKed then we have sent? ASSERT? */

                nacked = WRB_SENT(wrb);
            }

            nllvdbg("ACK: wrb=%p seqno=%u nacked=%u sent=%u ackno=%u\n",
                    wrb, WRB_SEQNO(wrb), nacked, WRB_SENT(wrb), ackno);

            /* Trim the ACKed bytes from the beginning of the write buffer. */

            WRB_TRIM(wrb, nacked);
            WRB_SEQNO(wrb) = ackno;
            WRB_SENT(wrb) -= nacked;

            nllvdbg("ACK: wrb=%p seqno=%u pktlen=%u sent=%u\n",
                    wrb, WRB_SEQNO(wrb), WRB_PKTLEN(wrb), WRB_SENT(wrb));
        }
    }

    /* Check for a loss of connection */

    else if ((flags & (TCP_CLOSE | TCP_ABORT | TCP_TIMEDOUT)) != 0)
    {
        nllvdbg("Lost connection: %04x\n", flags);

        /* Report not connected */

        net_lostconnection(psock, flags);

        /* Free write buffers and terminate polling */

        psock_lost_connection(psock, conn);
        return flags;
    }

    /* Check if we are being asked to retransmit data */

    else if ((flags & TCP_REXMIT) != 0)
    {
        FAR struct tcp_wrbuffer_s *wrb;
        FAR sq_entry_t *entry;

        nllvdbg("REXMIT: %04x\n", flags);

        /* If there is a partially sent write buffer at the head of the
         * write_q?  Has anything been sent from that write buffer?
         */

        wrb = (FAR struct tcp_wrbuffer_s *)sq_peek(&conn->write_q);
        nllvdbg("REXMIT: wrb=%p sent=%u\n", wrb, wrb ? WRB_SENT(wrb) : 0);

        if (wrb != NULL && WRB_SENT(wrb) > 0)
        {
            FAR struct tcp_wrbuffer_s *tmp;
            uint16_t sent;

            /* Yes.. Reset the number of bytes sent sent from the write buffer */

            sent = WRB_SENT(wrb);
            if (conn->unacked > sent)
            {
                conn->unacked -= sent;
            }
            else
            {
                conn->unacked = 0;
            }

            if (conn->sent > sent)
            {
                conn->sent -= sent;
            }
            else
            {
                conn->sent = 0;
            }

            WRB_SENT(wrb) = 0;
            nllvdbg("REXMIT: wrb=%p sent=%u, conn unacked=%d sent=%d\n",
                    wrb, WRB_SENT(wrb), conn->unacked, conn->sent);

            /* Increment the retransmit count on this write buffer. */

            if (++WRB_NRTX(wrb) >= TCP_MAXRTX)
            {
                nlldbg("Expiring wrb=%p nrtx=%u\n", wrb, WRB_NRTX(wrb));

                /* The maximum retry count as been exhausted. Remove the write
                 * buffer at the head of the queue.
                 */

                tmp = (FAR struct tcp_wrbuffer_s *)sq_remfirst(&conn->write_q);
                DEBUGASSERT(tmp == wrb);
                UNUSED(tmp);

                /* And return the write buffer to the free list */

                tcp_wrbuffer_release(wrb);

                /* NOTE expired is different from un-ACKed, it is designed to
                 * represent the number of segments that have been sent,
                 * retransmitted, and un-ACKed, if expired is not zero, the
                 * connection will be closed.
                 *
                 * field expired can only be updated at TCP_ESTABLISHED state
                 */

                conn->expired++;
            }
        }

        /* Move all segments that have been sent but not ACKed to the write
         * queue again note, the un-ACKed segments are put at the head of the
         * write_q so they can be resent as soon as possible.
         */

        while ((entry = sq_remlast(&conn->unacked_q)) != NULL)
        {
            wrb = (FAR struct tcp_wrbuffer_s*)entry;
            uint16_t sent;

            /* Reset the number of bytes sent sent from the write buffer */

            sent = WRB_SENT(wrb);
            if (conn->unacked > sent)
            {
                conn->unacked -= sent;
            }
            else
            {
                conn->unacked = 0;
            }

            if (conn->sent > sent)
            {
                conn->sent -= sent;
            }
            else
            {
                conn->sent = 0;
            }

            WRB_SENT(wrb) = 0;
            nllvdbg("REXMIT: wrb=%p sent=%u, conn unacked=%d sent=%d\n",
                    wrb, WRB_SENT(wrb), conn->unacked, conn->sent);

            /* Free any write buffers that have exceed the retry count */

            if (++WRB_NRTX(wrb) >= TCP_MAXRTX)
            {
                nlldbg("Expiring wrb=%p nrtx=%u\n", wrb, WRB_NRTX(wrb));

                /* Return the write buffer to the free list */

                tcp_wrbuffer_release(wrb);

                /* NOTE expired is different from un-ACKed, it is designed to
                 * represent the number of segments that have been sent,
                 * retransmitted, and un-ACKed, if expired is not zero, the
                 * connection will be closed.
                 *
                 * field expired can only be updated at TCP_ESTABLISHED state
                 */

                conn->expired++;
                continue;
            }
            else
            {
                /* Insert the write buffer into the write_q (in sequence
                 * number order).  The retransmission will occur below
                 * when the write buffer with the lowest sequenc number
                 * is pulled from the write_q again.
                 */

                nllvdbg("REXMIT: Moving wrb=%p nrtx=%u\n", wrb, WRB_NRTX(wrb));

                psock_insert_segment(wrb, &conn->write_q);
            }
        }
    }

    /* Check if the outgoing packet is available (it may have been claimed
     * by a sendto interrupt serving a different thread).
     */

    if (dev->d_sndlen > 0)
    {
        /* Another thread has beat us sending data, wait for the next poll */

        return flags;
    }

    /* We get here if (1) not all of the data has been ACKed, (2) we have been
     * asked to retransmit data, (3) the connection is still healthy, and (4)
     * the outgoing packet is available for our use.  In this case, we are
     * now free to send more data to receiver -- UNLESS the buffer contains
     * unprocessed incoming data.  In that event, we will have to wait for the
     * next polling cycle.
     */

    if ((conn->tcpstateflags & TCP_ESTABLISHED) &&
            (flags & (TCP_POLL | TCP_REXMIT)) &&
            !(sq_empty(&conn->write_q)))
    {
        /* Check if the destination IP address is in the ARP table.  If not,
         * then the send won't actually make it out... it will be replaced with
         * an ARP request.
         *
         * NOTE 1: This could be an expensive check if there are a lot of
         * entries in the ARP table.
         *
         * NOTE 2: If we are actually harvesting IP addresses on incoming IP
         * packets, then this check should not be necessary; the MAC mapping
         * should already be in the ARP table in many cases.
         *
         * NOTE 3: If CONFIG_NET_ARP_SEND then we can be assured that the IP
         * address mapping is already in the ARP table.
         */

#if defined(CONFIG_NET_ETHERNET) && !defined(CONFIG_NET_ARP_IPIN) && \
    !defined(CONFIG_NET_ARP_SEND)
        if (arp_find(conn->ripaddr) != NULL)
#endif
        {
            FAR struct tcp_wrbuffer_s *wrb;
            size_t sndlen;

            /* Peek at the head of the write queue (but don't remove anything
             * from the write queue yet).  We know from the above test that
             * the write_q is not empty.
             */

            wrb = (FAR struct tcp_wrbuffer_s *)sq_peek(&conn->write_q);
            DEBUGASSERT(wrb);

            /* Get the amount of data that we can send in the next packet.
             * We will send either the remaining data in the buffer I/O
             * buffer chain, or as much as will fit given the MSS and current
             * window size.
             */

            sndlen = WRB_PKTLEN(wrb) - WRB_SENT(wrb);
            if (sndlen > tcp_mss(conn))
            {
                sndlen = tcp_mss(conn);
            }

            if (sndlen > conn->winsize)
            {
                sndlen = conn->winsize;
            }

            nllvdbg("SEND: wrb=%p pktlen=%u sent=%u sndlen=%u\n",
                    wrb, WRB_PKTLEN(wrb), WRB_SENT(wrb), sndlen);

            /* Set the sequence number for this segment.  If we are
             * retransmitting, then the sequence number will already
             * be set for this write buffer.
             */

            if (WRB_SEQNO(wrb) == (unsigned)-1)
            {
                WRB_SEQNO(wrb) = conn->isn + conn->sent;
            }

            /* The TCP stack updates sndseq on receipt of ACK *before*
             * this function is called. In that case sndseq will point
             * to the next unacknowledged byte (which might have already
             * been sent). We will overwrite the value of sndseq here
             * before the packet is sent.
             */

            tcp_setsequence(conn->sndseq, WRB_SEQNO(wrb) + WRB_SENT(wrb));

            /* Then set-up to send that amount of data with the offset
             * corresponding to the amount of data already sent. (this
             * won't actually happen until the polling cycle completes).
             */

            devif_iob_send(dev, WRB_IOB(wrb), sndlen, WRB_SENT(wrb));

            /* Remember how much data we send out now so that we know
             * when everything has been acknowledged.  Just increment
             * the amount of data sent. This will be needed in sequence
             * number calculations.
             */

            conn->unacked += sndlen;
            conn->sent    += sndlen;

            nllvdbg("SEND: wrb=%p nrtx=%u unacked=%u sent=%u\n",
                    wrb, WRB_NRTX(wrb), conn->unacked, conn->sent);

            /* Increment the count of bytes sent from this write buffer */

            WRB_SENT(wrb) += sndlen;

            nllvdbg("SEND: wrb=%p sent=%u pktlen=%u\n",
                    wrb, WRB_SENT(wrb), WRB_PKTLEN(wrb));

            /* Remove the write buffer from the write queue if the
             * last of the data has been sent from the buffer.
             */

            DEBUGASSERT(WRB_SENT(wrb) <= WRB_PKTLEN(wrb));
            if (WRB_SENT(wrb) >= WRB_PKTLEN(wrb))
            {
                FAR struct tcp_wrbuffer_s *tmp;

                nllvdbg("SEND: wrb=%p Move to unacked_q\n", wrb);

                tmp = (FAR struct tcp_wrbuffer_s *)sq_remfirst(&conn->write_q);
                DEBUGASSERT(tmp == wrb);
                UNUSED(tmp);

                /* Put the I/O buffer chain in the un-acked queue; the
                 * segment is waiting for ACK again
                 */

                psock_insert_segment(wrb, &conn->unacked_q);
            }

            /* Only one data can be sent by low level driver at once,
             * tell the caller stop polling the other connection.
             */

            flags &= ~TCP_POLL;
        }
    }

    /* Continue waiting */

    return flags;
}
Ejemplo n.º 6
0
static uint16_t sendfile_interrupt(FAR struct net_driver_s *dev, FAR void *pvconn,
                                   FAR void *pvpriv, uint16_t flags)
{
  FAR struct tcp_conn_s *conn = (FAR struct tcp_conn_s *)pvconn;
  FAR struct sendfile_s *pstate = (FAR struct sendfile_s *)pvpriv;
  int ret;

#ifdef CONFIG_NETDEV_MULTINIC
  /* The TCP socket is connected and, hence, should be bound to a device.
   * Make sure that the polling device is the own that we are bound to.
   */

  DEBUGASSERT(conn->dev != NULL);
  if (dev != conn->dev)
    {
      return flags;
    }
#endif

  nllvdbg("flags: %04x acked: %d sent: %d\n",
          flags, pstate->snd_acked, pstate->snd_sent);

  /* Check for a loss of connection */

  if ((flags & TCP_DISCONN_EVENTS) != 0)
    {
      /* Report not connected */

      nlldbg("Lost connection\n");

      net_lostconnection(pstate->snd_sock, flags);
      pstate->snd_sent = -ENOTCONN;
      goto end_wait;
    }

  /* We get here if (1) not all of the data has been ACKed, (2) we have been
   * asked to retransmit data, (3) the connection is still healthy, and (4)
   * the outgoing packet is available for our use.  In this case, we are
   * now free to send more data to receiver -- UNLESS the buffer contains
   * unprocessing incoming data.  In that event, we will have to wait for the
   * next polling cycle.
   */

  if ((flags & TCP_NEWDATA) == 0 && pstate->snd_sent < pstate->snd_flen)
    {
      /* Get the amount of data that we can send in the next packet */

      uint32_t sndlen = pstate->snd_flen - pstate->snd_sent;

      if (sndlen > conn->mss)
        {
          sndlen = conn->mss;
        }

      /* Check if we have "space" in the window */

      if ((pstate->snd_sent - pstate->snd_acked + sndlen) < conn->winsize)
        {
          uint32_t seqno;

          /* Then set-up to send that amount of data. (this won't actually
           * happen until the polling cycle completes).
           */

          ret = file_seek(pstate->snd_file,
                          pstate->snd_foffset + pstate->snd_sent, SEEK_SET);
          if (ret < 0)
            {
              int errcode = get_errno();
              nlldbg("failed to lseek: %d\n", errcode);
              pstate->snd_sent = -errcode;
              goto end_wait;
            }

          ret = file_read(pstate->snd_file, dev->d_appdata, sndlen);
          if (ret < 0)
            {
              int errcode = get_errno();
              nlldbg("failed to read from input file: %d\n", errcode);
              pstate->snd_sent = -errcode;
              goto end_wait;
            }

          dev->d_sndlen = sndlen;

          /* Set the sequence number for this packet.  NOTE:  The network updates
           * sndseq on recept of ACK *before* this function is called.  In that
           * case sndseq will point to the next unacknowledge byte (which might
           * have already been sent).  We will overwrite the value of sndseq
           * here before the packet is sent.
           */

          seqno = pstate->snd_sent + pstate->snd_isn;
          nllvdbg("SEND: sndseq %08x->%08x len: %d\n", conn->sndseq, seqno, ret);

          tcp_setsequence(conn->sndseq, seqno);

          /* 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 || sendfile_addrcheck(conn))
            {
              /* Update the amount of data sent (but not necessarily ACKed) */

              pstate->snd_sent += sndlen;
              nllvdbg("pid: %d SEND: acked=%d sent=%d flen=%d\n", getpid(),
                     pstate->snd_acked, pstate->snd_sent, pstate->snd_flen);
            }
        }
      else
        {
          nlldbg("Window full, wait for ack\n");
          goto wait;
        }
    }

#ifdef CONFIG_NET_SOCKOPTS
  /* All data has been send and we are just waiting for ACK or re-transmit
   * indications to complete the send.  Check for a timeout.
   */

  if (sendfile_timeout(pstate))
    {
      /* Yes.. report the timeout */

      nlldbg("SEND timeout\n");
      pstate->snd_sent = -ETIMEDOUT;
      goto end_wait;
    }
#endif /* CONFIG_NET_SOCKOPTS */

  if (pstate->snd_sent >= pstate->snd_flen
      && pstate->snd_acked < pstate->snd_flen)
    {
      /* All data has been sent, but there are outstanding ACK's */

      goto wait;
    }

end_wait:

  /* Do not allow any further callbacks */

  pstate->snd_datacb->flags   = 0;
  pstate->snd_datacb->priv    = NULL;
  pstate->snd_datacb->event   = NULL;

  /* Wake up the waiting thread */

  sem_post(&pstate->snd_sem);

wait:
  return flags;
}
Ejemplo n.º 7
0
static uint16_t ack_interrupt(FAR struct net_driver_s *dev, FAR void *pvconn,
                              FAR void *pvpriv, uint16_t flags)
{
  FAR struct sendfile_s *pstate = (FAR struct sendfile_s *)pvpriv;

  nllvdbg("flags: %04x\n", flags);

  if ((flags & TCP_ACKDATA) != 0)
    {
      FAR struct tcp_hdr_s *tcp;

#ifdef CONFIG_NET_SOCKOPTS
      /* Update the timeout */

      pstate->snd_time = clock_systimer();
#endif

      /* Get the offset address of the TCP header */

#ifdef CONFIG_NET_IPv6
#ifdef CONFIG_NET_IPv4
      if (IFF_IS_IPv6(dev->d_flags))
#endif
        {
          DEBUGASSERT(pstate->snd_sock == PF_INET6);
          tcp = TCPIPv6BUF;
        }
#endif /* CONFIG_NET_IPv6 */

#ifdef CONFIG_NET_IPv4
#ifdef CONFIG_NET_IPv6
      else
#endif
        {
          DEBUGASSERT(pstate->snd_sock == PF_INET);
          tcp = TCPIPv4BUF;
        }
#endif /* CONFIG_NET_IPv4 */

      /* The current acknowledgement number number is the (relative) offset
       * of the of the next byte needed by the receiver.  The snd_isn is the
       * offset of the first byte to send to the receiver.  The difference
       * is the number of bytes to be acknowledged.
       */

      pstate->snd_acked = tcp_getsequence(tcp->ackno) - pstate->snd_isn;
      nllvdbg("ACK: acked=%d sent=%d flen=%d\n",
             pstate->snd_acked, pstate->snd_sent, pstate->snd_flen);

      dev->d_sndlen = 0;

      flags &= ~TCP_ACKDATA;
    }
  else if ((flags & TCP_REXMIT) != 0)
    {
      nlldbg("REXMIT\n");

      /* Yes.. in this case, reset the number of bytes that have been sent
       * to the number of bytes that have been ACKed.
       */

      pstate->snd_sent = pstate->snd_acked;
    }

  /* Check for a loss of connection */

  else if ((flags & TCP_DISCONN_EVENTS) != 0)
    {
      /* Report not connected */

      nlldbg("Lost connection\n");

      net_lostconnection(pstate->snd_sock, flags);
      pstate->snd_sent = -ENOTCONN;
    }

  /* Wake up the waiting thread */

  sem_post(&pstate->snd_sem);

  return flags;
}
Ejemplo n.º 8
0
static uint16_t sendfile_interrupt(FAR struct net_driver_s *dev, FAR void *pvconn,
                                   FAR void *pvpriv, uint16_t flags)
{
  FAR struct tcp_conn_s *conn = (FAR struct tcp_conn_s*)pvconn;
  FAR struct sendfile_s *pstate = (FAR struct sendfile_s *)pvpriv;
  int ret;

  nllvdbg("flags: %04x acked: %d sent: %d\n",
          flags, pstate->snd_acked, pstate->snd_sent);

  /* Check for a loss of connection */

  if ((flags & (TCP_CLOSE | TCP_ABORT | TCP_TIMEDOUT)) != 0)
    {
      /* Report not connected */

      nlldbg("Lost connection\n");

      net_lostconnection(pstate->snd_sock, flags);
      pstate->snd_sent = -ENOTCONN;
      goto end_wait;
    }

  /* We get here if (1) not all of the data has been ACKed, (2) we have been
   * asked to retransmit data, (3) the connection is still healthy, and (4)
   * the outgoing packet is available for our use.  In this case, we are
   * now free to send more data to receiver -- UNLESS the buffer contains
   * unprocessing incoming data.  In that event, we will have to wait for the
   * next polling cycle.
   */

  if ((flags & TCP_NEWDATA) == 0 && pstate->snd_sent < pstate->snd_flen)
    {
      /* Get the amount of data that we can send in the next packet */

      uint32_t sndlen = pstate->snd_flen - pstate->snd_sent;

      if (sndlen > tcp_mss(conn))
        {
          sndlen = tcp_mss(conn);
        }

      /* Check if we have "space" in the window */

      if ((pstate->snd_sent - pstate->snd_acked + sndlen) < conn->winsize)
        {
          uint32_t seqno;

          /* Then set-up to send that amount of data. (this won't actually
           * happen until the polling cycle completes).
           */

          ret = file_seek(pstate->snd_file,
                          pstate->snd_foffset + pstate->snd_sent, SEEK_SET);
          if (ret < 0)
            {
              int errcode = errno;
              nlldbg("failed to lseek: %d\n", errcode);
              pstate->snd_sent = -errcode;
              goto end_wait;
            }

          ret = file_read(pstate->snd_file, dev->d_snddata, sndlen);
          if (ret < 0)
            {
              int errcode = errno;
              nlldbg("failed to read from input file: %d\n", errcode);
              pstate->snd_sent = -errcode;
              goto end_wait;
            }

          dev->d_sndlen = sndlen;

          /* Set the sequence number for this packet.  NOTE:  uIP updates
           * sndseq on recept of ACK *before* this function is called.  In that
           * case sndseq will point to the next unacknowledge byte (which might
           * have already been sent).  We will overwrite the value of sndseq
           * here before the packet is sent.
           */

          seqno = pstate->snd_sent + pstate->snd_isn;
          nllvdbg("SEND: sndseq %08x->%08x len: %d\n", conn->sndseq, seqno, ret);

          tcp_setsequence(conn->sndseq, seqno);

          /* Check if the destination IP address is in the ARP table.  If not,
           * then the send won't actually make it out... it will be replaced with
           * an ARP request.
           *
           * NOTE 1: This could be an expensive check if there are a lot of entries
           * in the ARP table.  Hence, we only check on the first packet -- when
           * snd_sent is zero.
           *
           * NOTE 2: If we are actually harvesting IP addresses on incoming IP
           * packets, then this check should not be necessary; the MAC mapping
           * should already be in the ARP table in many cases.
           *
           * NOTE 3: If CONFIG_NET_ARP_SEND then we can be assured that the IP
           * address mapping is already in the ARP table.
           */

#if defined(CONFIG_NET_ETHERNET) && !defined(CONFIG_NET_ARP_IPIN) && \
    !defined(CONFIG_NET_ARP_SEND)
          if (pstate->snd_sent != 0 || arp_find(conn->ripaddr) != NULL)
#endif
            {
              /* Update the amount of data sent (but not necessarily ACKed) */

              pstate->snd_sent += sndlen;
              nllvdbg("pid: %d SEND: acked=%d sent=%d flen=%d\n", getpid(),
                     pstate->snd_acked, pstate->snd_sent, pstate->snd_flen);
            }
        }
      else
        {
          nlldbg("Window full, wait for ack\n");
          goto wait;
        }
    }

#ifdef CONFIG_NET_SOCKOPTS
  /* All data has been send and we are just waiting for ACK or re-transmit
   * indications to complete the send.  Check for a timeout.
   */

  if (sendfile_timeout(pstate))
    {
      /* Yes.. report the timeout */

      nlldbg("SEND timeout\n");
      pstate->snd_sent = -ETIMEDOUT;
      goto end_wait;
    }
#endif /* CONFIG_NET_SOCKOPTS */

  if (pstate->snd_sent >= pstate->snd_flen
      && pstate->snd_acked < pstate->snd_flen)
    {
      /* All data has been sent, but there are outstanding ACK's */

      goto wait;
    }

end_wait:

  /* Do not allow any further callbacks */

  pstate->snd_datacb->flags   = 0;
  pstate->snd_datacb->priv    = NULL;
  pstate->snd_datacb->event   = NULL;

  /* Wake up the waiting thread */

  sem_post(&pstate->snd_sem);

wait:
  return flags;
}
Ejemplo n.º 9
0
static uint16_t send_interrupt(FAR struct uip_driver_s *dev, FAR void *pvconn,
                               FAR void *pvpriv, uint16_t flags)
{
  FAR struct uip_conn *conn = (FAR struct uip_conn*)pvconn;
  FAR struct socket *psock = (FAR struct socket *)pvpriv;

  nllvdbg("flags: %04x\n", flags);

  /* If this packet contains an acknowledgement, then update the count of
   * acknowledged bytes.
   */

  if ((flags & UIP_ACKDATA) != 0)
    {
      FAR sq_entry_t *entry, *next;
      FAR struct uip_wrbuffer_s *segment;
      uint32_t ackno;

      ackno = uip_tcpgetsequence(TCPBUF->ackno);
      for (entry = sq_peek(&conn->unacked_q); entry; entry = next)
        {
          next    = sq_next(entry);
          segment = (FAR struct uip_wrbuffer_s*)entry;

          if (segment->wb_seqno < ackno)
            {
              nllvdbg("ACK: acked=%d buflen=%d ackno=%d\n",
                      segment->wb_seqno, segment->wb_nbytes, ackno);

              /* Segment was ACKed. Remove from ACK waiting queue */

              sq_rem(entry, &conn->unacked_q);

              /* Return the write buffer to the pool of free buffers */

              uip_tcpwrbuffer_release(segment);
            }
        }
    }

  /* Check for a loss of connection */

  else if ((flags & (UIP_CLOSE | UIP_ABORT | UIP_TIMEDOUT)) != 0)
    {
      /* Report not connected */

       nllvdbg("Lost connection\n");
       net_lostconnection(psock, flags);
       goto end_wait;
     }

   /* Check if we are being asked to retransmit data */

   else if ((flags & UIP_REXMIT) != 0)
    {
      sq_entry_t *entry;

      /* Put all segments that have been sent but not ACKed to write queue
       * again note, the un-ACKed segment is put at the first of the write_q,
       * so it can be sent as soon as possible.
       */

      while ((entry = sq_remlast(&conn->unacked_q)))
        {
          struct uip_wrbuffer_s *segment = (struct uip_wrbuffer_s*)entry;

          if (segment->wb_nrtx >= UIP_MAXRTX)
            {
              //conn->unacked -= segment->wb_nbytes;

              /* Return the write buffer */

              uip_tcpwrbuffer_release(segment);

              /* NOTE expired is different from un-ACKed, it is designed to
               * represent the number of segments that have been sent,
               * retransmitted, and un-ACKed, if expired is not zero, the
               * connection will be closed.
               *
               * field expired can only be updated at UIP_ESTABLISHED state
               */

              conn->expired++;
              continue;
            }

          send_insert_seqment(segment, &conn->write_q);
        }
    }

  /* Check if the outgoing packet is available (it may have been claimed
   * by a sendto interrupt serving a different thread).
   */

  if (dev->d_sndlen > 0)
    {
      /* Another thread has beat us sending data, wait for the next poll */

      return flags;
    }

  /* We get here if (1) not all of the data has been ACKed, (2) we have been
   * asked to retransmit data, (3) the connection is still healthy, and (4)
   * the outgoing packet is available for our use.  In this case, we are
   * now free to send more data to receiver -- UNLESS the buffer contains
   * unprocesed incoming data.  In that event, we will have to wait for the
   * next polling cycle.
   */

  if ((conn->tcpstateflags & UIP_ESTABLISHED) &&
      (flags & (UIP_POLL | UIP_REXMIT)) &&
      !(sq_empty(&conn->write_q)))
    {
      /* Check if the destination IP address is in the ARP table.  If not,
       * then the send won't actually make it out... it will be replaced with
       * an ARP request.
       *
       * NOTE 1: This could be an expensive check if there are a lot of
       * entries in the ARP table.
       *
       * NOTE 2: If we are actually harvesting IP addresses on incomming IP
       * packets, then this check should not be necessary; the MAC mapping
       * should already be in the ARP table.
       */

#if defined(CONFIG_NET_ETHERNET) && !defined(CONFIG_NET_ARP_IPIN)
      if (uip_arp_find(conn->ripaddr) != NULL)
#endif
        {
          FAR struct uip_wrbuffer_s *segment;
          FAR void *sndbuf;
          size_t sndlen;

          /* Get the amount of data that we can send in the next packet */

          segment = (FAR struct uip_wrbuffer_s *)sq_remfirst(&conn->write_q);
          if (segment)
            {
              sndbuf = segment->wb_buffer;
              sndlen = segment->wb_nbytes;

              DEBUGASSERT(sndlen <= uip_mss(conn));

              /* REVISIT:  There should be a check here to assure that we do
               * not excced the window (conn->winsize).
               */

              /* Set the sequence number for this segment.  NOTE: uIP
               * updates sndseq on receipt of ACK *before* this function
               * is called. In that case sndseq will point to the next
               * unacknowledged byte (which might have already been
               * sent). We will overwrite the value of sndseq here
               * before the packet is sent.
               */

              if (segment->wb_nrtx == 0 && segment->wb_seqno == (unsigned)-1)
                {
                  segment->wb_seqno = conn->isn + conn->sent;
                }

              uip_tcpsetsequence(conn->sndseq, segment->wb_seqno);

              /* Then set-up to send that amount of data. (this won't
               * actually happen until the polling cycle completes).
               */

              uip_send(dev, sndbuf, sndlen);

              /* Remember how much data we send out now so that we know
               * when everything has been acknowledged.  Just increment
               * the amount of data sent. This will be needed in
               * sequence* number calculations and we know that this is
               * not a re-transmission. Re-transmissions do not go through
               * this path.
               */

              if (segment->wb_nrtx == 0)
                {
                  conn->unacked += sndlen;
                  conn->sent    += sndlen;
                }

              /* Increment the retransmission counter before expiration.
               * NOTE we will not calculate the retransmission timer
               * (RTT) to save cpu cycles, each send_insert_seqment
               * segment will be retransmitted UIP_MAXRTX times in halt-
               * second interval before expiration.
               */

              segment->wb_nrtx++;

              /* The segment is waiting for ACK again */

              send_insert_seqment(segment, &conn->unacked_q);

              /* Only one data can be sent by low level driver at once,
               * tell the caller stop polling the other connection.
               */

              flags &= ~UIP_POLL;
            }
        }
    }

  /* Continue waiting */

  return flags;

end_wait:

  /* Do not allow any further callbacks */

  psock->s_sndcb->flags = 0;
  psock->s_sndcb->event = NULL;

  return flags;
}
Ejemplo n.º 10
0
static uint16_t recvfrom_tcpinterrupt(FAR struct uip_driver_s *dev,
                                      FAR void *conn, FAR void *pvpriv,
                                      uint16_t flags)
{
    FAR struct recvfrom_s *pstate = (struct recvfrom_s *)pvpriv;

    nllvdbg("flags: %04x\n", flags);

    /* 'priv' might be null in some race conditions (?) */

    if (pstate)
    {
        /* If new data is available, then complete the read action. */

        if ((flags & UIP_NEWDATA) != 0)
        {
            /* Copy the data from the packet (saving any unused bytes from the
             * packet in the read-ahead buffer).
             */

            recvfrom_newtcpdata(dev, pstate);

            /* Save the sender's address in the caller's 'from' location */

            recvfrom_tcpsender(dev, pstate);

            /* Indicate that the data has been consumed and that an ACK
             * should be sent.
             */

            flags = (flags & ~UIP_NEWDATA) | UIP_SNDACK;

            /* Check for transfer complete.  We will consider the transfer
             * complete in own of two different ways, depending on the setting
             * of CONFIG_NET_TCP_RECVDELAY.
             *
             * 1) If CONFIG_NET_TCP_RECVDELAY == 0 then we will consider the
             *    TCP/IP transfer complete as soon as any data has been received.
             *    This is safe because if any additional data is received, it
             *    will be retained inthe TCP/IP read-ahead buffer until the
             *    next receive is performed.
             * 2) CONFIG_NET_TCP_RECVDELAY > 0 may be set to wait a little
             *    bit to determine if more data will be received.  You might
             *    do this if read-ahead buffereing is disabled and we want to
             *    minimize the loss of back-to-back packets.  In this case,
             *    the transfer is complete when either a) the entire user buffer
             *    is full or 2) when the receive timeout occurs (below).
             */

#if CONFIG_NET_TCP_RECVDELAY > 0
            if (pstate->rf_buflen == 0)
#else
            if (pstate->rf_recvlen > 0)
#endif
            {
                nllvdbg("TCP resume\n");

                /* The TCP receive buffer is full.  Return now and don't allow
                 * any further TCP call backs.
                 */

                pstate->rf_cb->flags   = 0;
                pstate->rf_cb->priv    = NULL;
                pstate->rf_cb->event   = NULL;

                /* Wake up the waiting thread, returning the number of bytes
                 * actually read.
                 */

                sem_post(&pstate->rf_sem);
            }

            /* Reset the timeout.  We will want a short timeout to terminate
             * the TCP receive.
             */

#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
            pstate->rf_starttime = clock_systimer();
#endif
        }

        /* Check for a loss of connection.
         *
         * UIP_CLOSE: The remote host has closed the connection
         * UIP_ABORT: The remote host has aborted the connection
         * UIP_TIMEDOUT: Connection aborted due to too many retransmissions.
         */

        else if ((flags & (UIP_CLOSE|UIP_ABORT|UIP_TIMEDOUT)) != 0)
        {
            nllvdbg("Lost connection\n");

            /* Stop further callbacks */

            pstate->rf_cb->flags   = 0;
            pstate->rf_cb->priv    = NULL;
            pstate->rf_cb->event   = NULL;

            /* Handle loss-of-connection event */

            net_lostconnection(pstate->rf_sock, flags);

            /* Check if the peer gracefully closed the connection. */

            if ((flags & UIP_CLOSE) != 0)
            {
                /* This case should always return success (zero)! The value of
                 * rf_recvlen, if zero, will indicate that the connection was
                 * gracefully closed.
                 */

                pstate->rf_result = 0;
            }
            else
            {
                /* If no data has been received, then return ENOTCONN.
                 * Otherwise, let this return success.  The failure will
                 * be reported the next time that recv[from]() is called.
                 */

#if CONFIG_NET_TCP_RECVDELAY > 0
                if (pstate->rf_recvlen > 0)
                {
                    pstate->rf_result = 0;
                }
                else
                {
                    pstate->rf_result = -ENOTCONN;
                }
#else
                pstate->rf_result = -ENOTCONN;
#endif
            }

            /* Wake up the waiting thread */

            sem_post(&pstate->rf_sem);
        }

        /* No data has been received -- this is some other event... probably a
         * poll -- check for a timeout.
         */

#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
        else if (recvfrom_timeout(pstate))
        {
            /* Yes.. the timeout has elapsed... do not allow any further
             * callbacks
             */

            nllvdbg("TCP timeout\n");

            pstate->rf_cb->flags   = 0;
            pstate->rf_cb->priv    = NULL;
            pstate->rf_cb->event   = NULL;

            /* Report an error only if no data has been received. (If
             * CONFIG_NET_TCP_RECVDELAY then rf_recvlen should always be
             * zero).
             */

#if CONFIG_NET_TCP_RECVDELAY > 0
            if (pstate->rf_recvlen == 0)
#endif
            {
                /* Report the timeout error */

                pstate->rf_result = -EAGAIN;
            }

            /* Wake up the waiting thread, returning either the error -EAGAIN
             * that signals the timeout event or the data received up to
             * the point tht the timeout occured (no error).
             */

            sem_post(&pstate->rf_sem);
        }
#endif /* CONFIG_NET_SOCKOPTS && !CONFIG_DISABLE_CLOCK */
    }
    return flags;
}
Ejemplo n.º 11
0
static uint16_t send_interrupt(FAR struct uip_driver_s *dev, FAR void *pvconn,
                               FAR void *pvpriv, uint16_t flags)
{
  FAR struct uip_conn *conn = (FAR struct uip_conn*)pvconn;
  FAR struct send_s *pstate = (FAR struct send_s *)pvpriv;

  nllvdbg("flags: %04x acked: %d sent: %d\n",
          flags, pstate->snd_acked, pstate->snd_sent);

  /* If this packet contains an acknowledgement, then update the count of
   * acknowledged bytes.
   */

  if ((flags & UIP_ACKDATA) != 0)
    {
      /* Update the timeout */

#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
      pstate->snd_time = clock_systimer();
#endif

      /* The current acknowledgement number number is the (relative) offset
       * of the of the next byte needed by the receiver.  The snd_isn is the
       * offset of the first byte to send to the receiver.  The difference
       * is the number of bytes to be acknowledged.
       */

      pstate->snd_acked = uip_tcpgetsequence(TCPBUF->ackno) - pstate->snd_isn;
      nllvdbg("ACK: acked=%d sent=%d buflen=%d\n",
              pstate->snd_acked, pstate->snd_sent, pstate->snd_buflen);

      /* Have all of the bytes in the buffer been sent and acknowledged? */

      if (pstate->snd_acked >= pstate->snd_buflen)
        {
          /* Yes.  Then pstate->snd_buflen should hold the number of bytes
           * actually sent.
           */

          goto end_wait;
        }

      /* No.. fall through to send more data if necessary */
    }

  /* Check if we are being asked to retransmit data */

  else if ((flags & UIP_REXMIT) != 0)
    {
      /* Yes.. in this case, reset the number of bytes that have been sent
       * to the number of bytes that have been ACKed.
       */

      pstate->snd_sent = pstate->snd_acked;

#if defined(CONFIG_NET_TCP_SPLIT)
      /* Reset the even/odd indicator to even since we need to
       * retransmit.
       */

      pstate->snd_odd = false;
#endif

      /* Fall through to re-send data from the last that was ACKed */
    }

 /* Check for a loss of connection */

  else if ((flags & (UIP_CLOSE|UIP_ABORT|UIP_TIMEDOUT)) != 0)
    {
      /* Report not connected */

      nllvdbg("Lost connection\n");

      net_lostconnection(pstate->snd_sock, flags);
      pstate->snd_sent = -ENOTCONN;
      goto end_wait;
    }

   /* Check if the outgoing packet is available (it may have been claimed
    * by a sendto interrupt serving a different thread).
    */

#if 0 /* We can't really support multiple senders on the same TCP socket */
   else if (dev->d_sndlen > 0)
     {
       /* Another thread has beat us sending data, wait for the next poll */

         return flags;
      }
#endif

  /* We get here if (1) not all of the data has been ACKed, (2) we have been
   * asked to retransmit data, (3) the connection is still healthy, and (4)
   * the outgoing packet is available for our use.  In this case, we are
   * now free to send more data to receiver -- UNLESS the buffer contains
   * unprocessed incoming data.  In that event, we will have to wait for the
   * next polling cycle.
   */

  if ((flags & UIP_NEWDATA) == 0 && pstate->snd_sent < pstate->snd_buflen)
    {
      uint32_t seqno;

      /* Get the amount of data that we can send in the next packet */

      uint32_t sndlen = pstate->snd_buflen - pstate->snd_sent;


#if defined(CONFIG_NET_TCP_SPLIT)

      /* RFC 1122 states that a host may delay ACKing for up to 500ms but
       * must respond to every second  segment).  This logic here will trick
       * the RFC 1122 recipient into responding sooner.  This logic will be
       * activated if:
       *
       *   1. An even number of packets has been send (where zero is an even
       *      number),
       *   2. There is more data be sent (more than or equal to
       *      CONFIG_NET_TCP_SPLIT_SIZE), but
       *   3. Not enough data for two packets.
       *
       * Then we will split the remaining, single packet into two partial
       * packets.  This will stimulate the RFC 1122 peer to ACK sooner.
       *
       * Don't try to split very small packets (less than CONFIG_NET_TCP_SPLIT_SIZE).
       * Only the first even packet and the last odd packets could have
       * sndlen less than CONFIG_NET_TCP_SPLIT_SIZE.  The value of sndlen on
       * the last even packet is guaranteed to be at least MSS/2 by the
       * logic below.
       */

      if (sndlen >= CONFIG_NET_TCP_SPLIT_SIZE)
        {
          /* sndlen is the number of bytes remaining to be sent.
           * uip_mss(conn) will return the number of bytes that can sent
           * in one packet.  The difference, then, is the number of bytes
           * that would be sent in the next packet after this one.
           */

          int32_t next_sndlen = sndlen - uip_mss(conn);

          /*  Is this the even packet in the packet pair transaction? */

          if (!pstate->snd_odd)
            {
              /* next_sndlen <= 0 means that the entire remaining data
               * could fit into this single packet.  This is condition
               * in which we must do the split.
               */

              if (next_sndlen <= 0)
                {
                  /* Split so that there will be an odd packet.  Here
                   * we know that 0 < sndlen <= MSS
                   */

                  sndlen = (sndlen / 2) + 1;
                }
            }

          /* No... this is the odd packet in the packet pair transaction */

          else
            {
              /* Will there be another (even) packet afer this one?
               * (next_sndlen > 0)  Will the split condition occur on that
               * next, even packet? ((next_sndlen - uip_mss(conn)) < 0) If
               * so, then perform the split now to avoid the case where the
               * byte count is less than CONFIG_NET_TCP_SPLIT_SIZE on the
               * next pair.
               */

              if (next_sndlen > 0 && (next_sndlen - uip_mss(conn)) < 0)
                {
                  /* Here, we know that sndlen must be MSS < sndlen <= 2*MSS
                   * and so (sndlen / 2) is <= MSS.
                   */

                  sndlen /= 2;
                }
            }
        }

      /* Toggle the even/odd indicator */

      pstate->snd_odd ^= true;

#endif /* CONFIG_NET_TCP_SPLIT */

      if (sndlen > uip_mss(conn))
        {
          sndlen = uip_mss(conn);
        }

      /* Check if we have "space" in the window */

      if ((pstate->snd_sent - pstate->snd_acked + sndlen) < conn->winsize)
        {
          /* Set the sequence number for this packet.  NOTE:  uIP updates
           * sndseq on recept of ACK *before* this function is called.  In that
           * case sndseq will point to the next unacknowledged byte (which might
           * have already been sent).  We will overwrite the value of sndseq
           * here before the packet is sent.
           */

          seqno = pstate->snd_sent + pstate->snd_isn;
          nllvdbg("SEND: sndseq %08x->%08x\n", conn->sndseq, seqno);
          uip_tcpsetsequence(conn->sndseq, seqno);

          /* Then set-up to send that amount of data. (this won't actually
           * happen until the polling cycle completes).
           */

          uip_send(dev, &pstate->snd_buffer[pstate->snd_sent], sndlen);

          /* Check if the destination IP address is in the ARP table.  If not,
           * then the send won't actually make it out... it will be replaced with
           * an ARP request.
           *
           * NOTE 1: This could be an expensive check if there are a lot of entries
           * in the ARP table.  Hence, we only check on the first packet -- when
           * snd_sent is zero.
           *
           * NOTE 2: If we are actually harvesting IP addresses on incoming IP
           * packets, then this check should not be necessary; the MAC mapping
           * should already be in the ARP table.
           */

#if defined(CONFIG_NET_ETHERNET) && !defined(CONFIG_NET_ARP_IPIN)
         if (pstate->snd_sent != 0 || uip_arp_find(conn->ripaddr) != NULL)
#endif
            {
              /* 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);

            }
        }
    }

  /* 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 defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
  if (send_timeout(pstate))
    {
      /* Yes.. report the timeout */

      nlldbg("SEND timeout\n");
      pstate->snd_sent = -ETIMEDOUT;
      goto end_wait;
    }
#endif /* CONFIG_NET_SOCKOPTS && !CONFIG_DISABLE_CLOCK */

  /* 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;
}