diff options
Diffstat (limited to 'nuttx/net/uip/uip_tcpinput.c')
| -rw-r--r-- | nuttx/net/uip/uip_tcpinput.c | 839 |
1 files changed, 0 insertions, 839 deletions
diff --git a/nuttx/net/uip/uip_tcpinput.c b/nuttx/net/uip/uip_tcpinput.c deleted file mode 100644 index 5b40963b6..000000000 --- a/nuttx/net/uip/uip_tcpinput.c +++ /dev/null @@ -1,839 +0,0 @@ -/**************************************************************************** - * net/uip/uip_tcpinput.c - * Handling incoming TCP input - * - * Copyright (C) 2007-2012 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <gnutt@nuttx.org> - * - * Adapted for NuttX from logic in uIP which also has a BSD-like license: - * - * Original author Adam Dunkels <adam@dunkels.com> - * Copyright () 2001-2003, Adam Dunkels. - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. The name of the author may not be used to endorse or promote - * products derived from this software without specific prior - * written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS - * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED - * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY - * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE - * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, - * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING - * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - * - ****************************************************************************/ - -/**************************************************************************** - * Included Files - ****************************************************************************/ - -#include <nuttx/config.h> - -#if defined(CONFIG_NET) && defined(CONFIG_NET_TCP) - -#include <stdint.h> -#include <string.h> -#include <debug.h> - -#include <nuttx/net/uip/uipopt.h> -#include <nuttx/net/uip/uip.h> -#include <nuttx/net/uip/uip-arch.h> - -#include "uip_internal.h" - -/**************************************************************************** - * Pre-processor Definitions - ****************************************************************************/ - -#define BUF ((struct uip_tcpip_hdr *)&dev->d_buf[UIP_LLH_LEN]) - -/**************************************************************************** - * Public Variables - ****************************************************************************/ - -/**************************************************************************** - * Private Variables - ****************************************************************************/ - -/**************************************************************************** - * Private Functions - ****************************************************************************/ - -/**************************************************************************** - * Public Functions - ****************************************************************************/ - -/**************************************************************************** - * Name: uip_tcpinput - * - * Description: - * Handle incoming TCP input - * - * Parameters: - * dev - The device driver structure containing the received TCP packet. - * - * Return: - * None - * - * Assumptions: - * Called from the interrupt level or with interrupts disabled. - * - ****************************************************************************/ - -void uip_tcpinput(struct uip_driver_s *dev) -{ - struct uip_conn *conn = NULL; - struct uip_tcpip_hdr *pbuf = BUF; - uint16_t tmp16; - uint16_t flags; - uint8_t opt; - uint8_t result; - int len; - int i; - - dev->d_snddata = &dev->d_buf[UIP_IPTCPH_LEN + UIP_LLH_LEN]; - dev->d_appdata = &dev->d_buf[UIP_IPTCPH_LEN + UIP_LLH_LEN]; - -#ifdef CONFIG_NET_STATISTICS - uip_stat.tcp.recv++; -#endif - - /* Start of TCP input header processing code. */ - - if (uip_tcpchksum(dev) != 0xffff) - { - /* Compute and check the TCP checksum. */ - -#ifdef CONFIG_NET_STATISTICS - uip_stat.tcp.drop++; - uip_stat.tcp.chkerr++; -#endif - nlldbg("Bad TCP checksum\n"); - goto drop; - } - - /* Demultiplex this segment. First check any active connections. */ - - conn = uip_tcpactive(pbuf); - if (conn) - { - /* We found an active connection.. Check for the subsequent SYN - * arriving in UIP_SYN_RCVD state after the SYNACK packet was - * lost. To avoid other issues, reset any active connection - * where a SYN arrives in a state != UIP_SYN_RCVD. - */ - - if ((conn->tcpstateflags & UIP_TS_MASK) != UIP_SYN_RCVD && - (BUF->flags & TCP_CTL) == TCP_SYN) - { - goto reset; - } - else - { - goto found; - } - } - - /* If we didn't find and active connection that expected the packet, - * either (1) this packet is an old duplicate, or (2) this is a SYN packet - * destined for a connection in LISTEN. If the SYN flag isn't set, - * it is an old packet and we send a RST. - */ - - if ((pbuf->flags & TCP_CTL) == TCP_SYN) - { - /* This is a SYN packet for a connection. Find the connection - * listening on this port. - */ - - tmp16 = pbuf->destport; - if (uip_islistener(tmp16)) - { - /* We matched the incoming packet with a connection in LISTEN. - * We now need to create a new connection and send a SYNACK in - * response. - */ - - /* First allocate a new connection structure and see if there is any - * user application to accept it. - */ - - conn = uip_tcpaccept(pbuf); - if (conn) - { - /* The connection structure was successfully allocated. Now see if - * there is an application waiting to accept the connection (or at - * least queue it it for acceptance). - */ - - conn->crefs = 1; - if (uip_accept(dev, conn, tmp16) != OK) - { - /* No, then we have to give the connection back and drop the packet */ - - conn->crefs = 0; - uip_tcpfree(conn); - conn = NULL; - } - else - { - /* TCP state machine should move to the ESTABLISHED state only after - * it has received ACK from the host. This needs to be investigated - * further. - */ - - conn->tcpstateflags = UIP_ESTABLISHED; - } - } - - if (!conn) - { - /* Either (1) all available connections are in use, or (2) there is no - * application in place to accept the connection. We drop packet and hope that - * the remote end will retransmit the packet at a time when we - * have more spare connections or someone waiting to accept the connection. - */ - -#ifdef CONFIG_NET_STATISTICS - uip_stat.tcp.syndrop++; -#endif - nlldbg("No free TCP connections\n"); - goto drop; - } - - uip_incr32(conn->rcvseq, 1); - - /* Parse the TCP MSS option, if present. */ - - if ((pbuf->tcpoffset & 0xf0) > 0x50) - { - for (i = 0; i < ((pbuf->tcpoffset >> 4) - 5) << 2 ;) - { - opt = dev->d_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + i]; - if (opt == TCP_OPT_END) - { - /* End of options. */ - - break; - } - else if (opt == TCP_OPT_NOOP) - { - /* NOP option. */ - - ++i; - } - else if (opt == TCP_OPT_MSS && - dev->d_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + i] == TCP_OPT_MSS_LEN) - { - /* An MSS option with the right option length. */ - - tmp16 = ((uint16_t)dev->d_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 2 + i] << 8) | - (uint16_t)dev->d_buf[UIP_IPTCPH_LEN + UIP_LLH_LEN + 3 + i]; - conn->initialmss = conn->mss = - tmp16 > UIP_TCP_MSS? UIP_TCP_MSS: tmp16; - - /* And we are done processing options. */ - - break; - } - else - { - /* All other options have a length field, so that we easily - * can skip past them. - */ - - if (dev->d_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + i] == 0) - { - /* If the length field is zero, the options are malformed - * and we don't process them further. - */ - - break; - } - i += dev->d_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + i]; - } - } - } - - /* Our response will be a SYNACK. */ - - uip_tcpack(dev, conn, TCP_ACK | TCP_SYN); - return; - } - } - - /* This is (1) an old duplicate packet or (2) a SYN packet but with - * no matching listener found. Send RST packet in either case. - */ - -reset: - - /* We do not send resets in response to resets. */ - - if ((pbuf->flags & TCP_RST) != 0) - { - goto drop; - } - -#ifdef CONFIG_NET_STATISTICS - uip_stat.tcp.synrst++; -#endif - uip_tcpreset(dev); - return; - -found: - - flags = 0; - - /* We do a very naive form of TCP reset processing; we just accept - * any RST and kill our connection. We should in fact check if the - * sequence number of this reset is within our advertised window - * before we accept the reset. - */ - - if ((pbuf->flags & TCP_RST) != 0) - { - conn->tcpstateflags = UIP_CLOSED; - nlldbg("RESET - TCP state: UIP_CLOSED\n"); - - (void)uip_tcpcallback(dev, conn, UIP_ABORT); - goto drop; - } - - /* Calculated the length of the data, if the application has sent - * any data to us. - */ - - len = (pbuf->tcpoffset >> 4) << 2; - - /* d_len will contain the length of the actual TCP data. This is - * calculated by subtracting the length of the TCP header (in - * len) and the length of the IP header (20 bytes). - */ - - dev->d_len -= (len + UIP_IPH_LEN); - - /* First, check if the sequence number of the incoming packet is - * what we're expecting next. If not, we send out an ACK with the - * correct numbers in, unless we are in the SYN_RCVD state and - * receive a SYN, in which case we should retransmit our SYNACK - * (which is done further down). - */ - - if (!((((conn->tcpstateflags & UIP_TS_MASK) == UIP_SYN_SENT) && - ((pbuf->flags & TCP_CTL) == (TCP_SYN | TCP_ACK))) || - (((conn->tcpstateflags & UIP_TS_MASK) == UIP_SYN_RCVD) && - ((pbuf->flags & TCP_CTL) == TCP_SYN)))) - { - if ((dev->d_len > 0 || ((pbuf->flags & (TCP_SYN | TCP_FIN)) != 0)) && - memcmp(pbuf->seqno, conn->rcvseq, 4) != 0) - { - uip_tcpsend(dev, conn, TCP_ACK, UIP_IPTCPH_LEN); - return; - } - } - - /* Next, check if the incoming segment acknowledges any outstanding - * data. If so, we update the sequence number, reset the length of - * the outstanding data, calculate RTT estimations, and reset the - * retransmission timer. - */ - - if ((pbuf->flags & TCP_ACK) != 0 && conn->unacked > 0) - { - uint32_t unackseq; - uint32_t ackseq; - - /* The next sequence number is equal to the current sequence - * number (sndseq) plus the size of the oustanding, unacknowledged - * data (unacked). - */ - - unackseq = uip_tcpaddsequence(conn->sndseq, conn->unacked); - - /* Get the sequence number of that has just been acknowledged by this - * incoming packet. - */ - - ackseq = uip_tcpgetsequence(pbuf->ackno); - - /* Check how many of the outstanding bytes have been acknowledged. For - * a most uIP send operation, this should always be true. However, - * the send() API sends data ahead when it can without waiting for - * the ACK. In this case, the 'ackseq' could be less than then the - * new sequence number. - */ - - if (ackseq <= unackseq) - { - /* Calculate the new number of oustanding, unacknowledged bytes */ - - conn->unacked = unackseq - ackseq; - } - else - { - /* What would it mean if ackseq > unackseq? The peer has ACKed - * more bytes than we think we have sent? Someone has lost it. - * Complain and reset the number of outstanding, unackowledged - * bytes - */ - - nlldbg("ERROR: ackseq[%08x] > unackseq[%08x]\n", ackseq, unackseq); - conn->unacked = 0; - } - - /* Update sequence number to the unacknowledge sequence number. If - * there is still outstanding, unacknowledged data, then this will - * be beyond ackseq. - */ - - nllvdbg("sndseq: %08x->%08x unackseq: %08x new unacked: %d\n", - conn->sndseq, ackseq, unackseq, conn->unacked); - uip_tcpsetsequence(conn->sndseq, ackseq); - - /* Do RTT estimation, unless we have done retransmissions. */ - - if (conn->nrtx == 0) - { - signed char m; - m = conn->rto - conn->timer; - - /* This is taken directly from VJs original code in his paper */ - - m = m - (conn->sa >> 3); - conn->sa += m; - if (m < 0) - { - m = -m; - } - - m = m - (conn->sv >> 2); - conn->sv += m; - conn->rto = (conn->sa >> 3) + conn->sv; - } - - /* Set the acknowledged flag. */ - - flags |= UIP_ACKDATA; - - /* Reset the retransmission timer. */ - - conn->timer = conn->rto; - } - - /* Do different things depending on in what state the connection is. */ - - switch (conn->tcpstateflags & UIP_TS_MASK) - { - /* CLOSED and LISTEN are not handled here. CLOSE_WAIT is not - * implemented, since we force the application to close when the - * peer sends a FIN (hence the application goes directly from - * ESTABLISHED to LAST_ACK). - */ - - case UIP_SYN_RCVD: - /* In SYN_RCVD we have sent out a SYNACK in response to a SYN, and - * we are waiting for an ACK that acknowledges the data we sent - * out the last time. Therefore, we want to have the UIP_ACKDATA - * flag set. If so, we enter the ESTABLISHED state. - */ - - if ((flags & UIP_ACKDATA) != 0) - { - conn->tcpstateflags = UIP_ESTABLISHED; - conn->unacked = 0; - nllvdbg("TCP state: UIP_ESTABLISHED\n"); - - flags = UIP_CONNECTED; - - if (dev->d_len > 0) - { - flags |= UIP_NEWDATA; - uip_incr32(conn->rcvseq, dev->d_len); - } - - dev->d_sndlen = 0; - result = uip_tcpcallback(dev, conn, flags); - uip_tcpappsend(dev, conn, result); - return; - } - - /* We need to retransmit the SYNACK */ - - if ((pbuf->flags & TCP_CTL) == TCP_SYN) - { - uip_tcpack(dev, conn, TCP_ACK | TCP_SYN); - return; - } - goto drop; - - case UIP_SYN_SENT: - /* In SYN_SENT, we wait for a SYNACK that is sent in response to - * our SYN. The rcvseq is set to sequence number in the SYNACK - * plus one, and we send an ACK. We move into the ESTABLISHED - * state. - */ - - if ((flags & UIP_ACKDATA) != 0 && (pbuf->flags & TCP_CTL) == (TCP_SYN | TCP_ACK)) - { - /* Parse the TCP MSS option, if present. */ - - if ((pbuf->tcpoffset & 0xf0) > 0x50) - { - for (i = 0; i < ((pbuf->tcpoffset >> 4) - 5) << 2 ;) - { - opt = dev->d_buf[UIP_IPTCPH_LEN + UIP_LLH_LEN + i]; - if (opt == TCP_OPT_END) - { - /* End of options. */ - - break; - } - else if (opt == TCP_OPT_NOOP) - { - /* NOP option. */ - - ++i; - } - else if (opt == TCP_OPT_MSS && - dev->d_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + i] == TCP_OPT_MSS_LEN) - { - /* An MSS option with the right option length. */ - - tmp16 = - (dev->d_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 2 + i] << 8) | - dev->d_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 3 + i]; - conn->initialmss = - conn->mss = - tmp16 > UIP_TCP_MSS? UIP_TCP_MSS: tmp16; - - /* And we are done processing options. */ - - break; - } - else - { - /* All other options have a length field, so that we - * easily can skip past them. - */ - - if (dev->d_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + i] == 0) - { - /* If the length field is zero, the options are - * malformed and we don't process them further. - */ - - break; - } - i += dev->d_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + i]; - } - } - } - - conn->tcpstateflags = UIP_ESTABLISHED; - memcpy(conn->rcvseq, pbuf->seqno, 4); - nllvdbg("TCP state: UIP_ESTABLISHED\n"); - - uip_incr32(conn->rcvseq, 1); - conn->unacked = 0; - dev->d_len = 0; - dev->d_sndlen = 0; - result = uip_tcpcallback(dev, conn, UIP_CONNECTED | UIP_NEWDATA); - uip_tcpappsend(dev, conn, result); - return; - } - - /* Inform the application that the connection failed */ - - (void)uip_tcpcallback(dev, conn, UIP_ABORT); - - /* The connection is closed after we send the RST */ - - conn->tcpstateflags = UIP_CLOSED; - nllvdbg("Connection failed - TCP state: UIP_CLOSED\n"); - - /* We do not send resets in response to resets. */ - - if ((pbuf->flags & TCP_RST) != 0) - { - goto drop; - } - uip_tcpreset(dev); - return; - - case UIP_ESTABLISHED: - /* In the ESTABLISHED state, we call upon the application to feed - * data into the d_buf. If the UIP_ACKDATA flag is set, the - * application should put new data into the buffer, otherwise we are - * retransmitting an old segment, and the application should put that - * data into the buffer. - * - * If the incoming packet is a FIN, we should close the connection on - * this side as well, and we send out a FIN and enter the LAST_ACK - * state. We require that there is no outstanding data; otherwise the - * sequence numbers will be screwed up. - */ - - if ((pbuf->flags & TCP_FIN) != 0 && (conn->tcpstateflags & UIP_STOPPED) == 0) - { - if (conn->unacked > 0) - { - goto drop; - } - - /* Update the sequence number and indicate that the connection has - * been closed. - */ - - uip_incr32(conn->rcvseq, dev->d_len + 1); - flags |= UIP_CLOSE; - - if (dev->d_len > 0) - { - flags |= UIP_NEWDATA; - } - - (void)uip_tcpcallback(dev, conn, flags); - - conn->tcpstateflags = UIP_LAST_ACK; - conn->unacked = 1; - conn->nrtx = 0; - nllvdbg("TCP state: UIP_LAST_ACK\n"); - - uip_tcpsend(dev, conn, TCP_FIN | TCP_ACK, UIP_IPTCPH_LEN); - return; - } - - /* Check the URG flag. If this is set, the segment carries urgent - * data that we must pass to the application. - */ - - if ((pbuf->flags & TCP_URG) != 0) - { -#ifdef CONFIG_NET_TCPURGDATA - dev->d_urglen = (pbuf->urgp[0] << 8) | pbuf->urgp[1]; - if (dev->d_urglen > dev->d_len) - { - /* There is more urgent data in the next segment to come. */ - - dev->d_urglen = dev->d_len; - } - - uip_incr32(conn->rcvseq, dev->d_urglen); - dev->d_len -= dev->d_urglen; - dev->d_urgdata = dev->d_appdata; - dev->d_appdata += dev->d_urglen; - } - else - { - dev->d_urglen = 0; -#else /* CONFIG_NET_TCPURGDATA */ - dev->d_appdata = ((uint8_t*)dev->d_appdata) + ((pbuf->urgp[0] << 8) | pbuf->urgp[1]); - dev->d_len -= (pbuf->urgp[0] << 8) | pbuf->urgp[1]; -#endif /* CONFIG_NET_TCPURGDATA */ - } - - /* If d_len > 0 we have TCP data in the packet, and we flag this - * by setting the UIP_NEWDATA flag. If the application has stopped - * the dataflow using uip_stop(), we must not accept any data - * packets from the remote host. - */ - - if (dev->d_len > 0 && (conn->tcpstateflags & UIP_STOPPED) == 0) - { - flags |= UIP_NEWDATA; - } - - /* Check if the available buffer space advertised by the other end - * is smaller than the initial MSS for this connection. If so, we - * set the current MSS to the window size to ensure that the - * application does not send more data than the other end can - * handle. - * - * If the remote host advertises a zero window, we set the MSS to - * the initial MSS so that the application will send an entire MSS - * of data. This data will not be acknowledged by the receiver, - * and the application will retransmit it. This is called the - * "persistent timer" and uses the retransmission mechanim. - */ - - tmp16 = ((uint16_t)pbuf->wnd[0] << 8) + (uint16_t)pbuf->wnd[1]; - if (tmp16 > conn->initialmss || tmp16 == 0) - { - tmp16 = conn->initialmss; - } - conn->mss = tmp16; - - /* If this packet constitutes an ACK for outstanding data (flagged - * by the UIP_ACKDATA flag), we should call the application since it - * might want to send more data. If the incoming packet had data - * from the peer (as flagged by the UIP_NEWDATA flag), the - * application must also be notified. - * - * When the application is called, the d_len field - * contains the length of the incoming data. The application can - * access the incoming data through the global pointer - * d_appdata, which usually points UIP_IPTCPH_LEN + UIP_LLH_LEN - * bytes into the d_buf array. - * - * If the application wishes to send any data, this data should be - * put into the d_appdata and the length of the data should be - * put into d_len. If the application don't have any data to - * send, d_len must be set to 0. - */ - - if ((flags & (UIP_NEWDATA | UIP_ACKDATA)) != 0) - { - /* Clear sndlen and remember the size in d_len. The application - * may modify d_len and we will need this value later when we - * update the sequence number. - */ - - dev->d_sndlen = 0; - len = dev->d_len; - - /* Provide the packet to the application */ - - result = uip_tcpcallback(dev, conn, flags); - - /* If the application successfully handled the incoming data, - * then UIP_SNDACK will be set in the result. In this case, - * we need to update the sequence number. The ACK will be - * send by uip_tcpappsend(). - */ - - if ((result & UIP_SNDACK) != 0) - { - /* Update the sequence number using the saved length */ - - uip_incr32(conn->rcvseq, len); - } - - /* Send the response, ACKing the data or not, as appropriate */ - - uip_tcpappsend(dev, conn, result); - return; - } - goto drop; - - case UIP_LAST_ACK: - /* We can close this connection if the peer has acknowledged our - * FIN. This is indicated by the UIP_ACKDATA flag. - */ - - if ((flags & UIP_ACKDATA) != 0) - { - conn->tcpstateflags = UIP_CLOSED; - nllvdbg("UIP_LAST_ACK TCP state: UIP_CLOSED\n"); - - (void)uip_tcpcallback(dev, conn, UIP_CLOSE); - } - break; - - case UIP_FIN_WAIT_1: - /* The application has closed the connection, but the remote host - * hasn't closed its end yet. Thus we do nothing but wait for a - * FIN from the other side. - */ - - if (dev->d_len > 0) - { - uip_incr32(conn->rcvseq, dev->d_len); - } - - if ((pbuf->flags & TCP_FIN) != 0) - { - if ((flags & UIP_ACKDATA) != 0) - { - conn->tcpstateflags = UIP_TIME_WAIT; - conn->timer = 0; - conn->unacked = 0; - nllvdbg("TCP state: UIP_TIME_WAIT\n"); - } - else - { - conn->tcpstateflags = UIP_CLOSING; - nllvdbg("TCP state: UIP_CLOSING\n"); - } - - uip_incr32(conn->rcvseq, 1); - (void)uip_tcpcallback(dev, conn, UIP_CLOSE); - uip_tcpsend(dev, conn, TCP_ACK, UIP_IPTCPH_LEN); - return; - } - else if ((flags & UIP_ACKDATA) != 0) - { - conn->tcpstateflags = UIP_FIN_WAIT_2; - conn->unacked = 0; - nllvdbg("TCP state: UIP_FIN_WAIT_2\n"); - goto drop; - } - - if (dev->d_len > 0) - { - uip_tcpsend(dev, conn, TCP_ACK, UIP_IPTCPH_LEN); - return; - } - goto drop; - - case UIP_FIN_WAIT_2: - if (dev->d_len > 0) - { - uip_incr32(conn->rcvseq, dev->d_len); - } - - if ((pbuf->flags & TCP_FIN) != 0) - { - conn->tcpstateflags = UIP_TIME_WAIT; - conn->timer = 0; - nllvdbg("TCP state: UIP_TIME_WAIT\n"); - - uip_incr32(conn->rcvseq, 1); - (void)uip_tcpcallback(dev, conn, UIP_CLOSE); - uip_tcpsend(dev, conn, TCP_ACK, UIP_IPTCPH_LEN); - return; - } - - if (dev->d_len > 0) - { - uip_tcpsend(dev, conn, TCP_ACK, UIP_IPTCPH_LEN); - return; - } - goto drop; - - case UIP_TIME_WAIT: - uip_tcpsend(dev, conn, TCP_ACK, UIP_IPTCPH_LEN); - return; - - case UIP_CLOSING: - if ((flags & UIP_ACKDATA) != 0) - { - conn->tcpstateflags = UIP_TIME_WAIT; - conn->timer = 0; - nllvdbg("TCP state: UIP_TIME_WAIT\n"); - } - - default: - break; - } - -drop: - dev->d_len = 0; -} - -#endif /* CONFIG_NET && CONFIG_NET_TCP */ |