Merge commit '60b30c036397cb5627fa374bb930794b225daa29' as 'lib/lufa'

11 files changed, 5909 insertions, 0 deletions

diff --git a/lib/lufa/Projects/Webserver/Lib/uip/clock.c b/lib/lufa/Projects/Webserver/Lib/uip/clock.c
new file mode 100644
index 0000000000..e71f7209d2
--- /dev/null
+++ b/lib/lufa/Projects/Webserver/Lib/uip/clock.c
@@ -0,0 +1,37 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <LUFA/Common/Common.h>
+
+#include "clock.h"
+
+//Counted time
+volatile clock_time_t clock_datetime = 0;
+
+//Overflow interrupt
+ISR(TIMER1_COMPA_vect, ISR_BLOCK)
+{
+	clock_datetime += 1;
+}
+
+//Initialise the clock
+void clock_init()
+{
+	OCR1A  = (((F_CPU / 1024) / 100) - 1);
+	TCCR1B = ((1 << WGM12) | (1 << CS12) | (1 << CS10));
+	TIMSK1 = (1 << OCIE1A);
+}
+
+//Return time
+clock_time_t clock_time()
+{
+	clock_time_t time;
+
+	GlobalInterruptDisable();
+	time = clock_datetime;
+	GlobalInterruptEnable();
+
+	return time;
+}
+
diff --git a/lib/lufa/Projects/Webserver/Lib/uip/clock.h b/lib/lufa/Projects/Webserver/Lib/uip/clock.h
new file mode 100644
index 0000000000..bbfa4ac0e3
--- /dev/null
+++ b/lib/lufa/Projects/Webserver/Lib/uip/clock.h
@@ -0,0 +1,13 @@
+#ifndef __CLOCK_ARCH_H__
+#define __CLOCK_ARCH_H__
+
+#include <stdint.h>
+#include <util/atomic.h>
+
+typedef uint16_t clock_time_t;
+#define CLOCK_SECOND 100
+void clock_init(void);
+clock_time_t clock_time(void);
+
+#endif /* __CLOCK_ARCH_H__ */
+
diff --git a/lib/lufa/Projects/Webserver/Lib/uip/timer.c b/lib/lufa/Projects/Webserver/Lib/uip/timer.c
new file mode 100644
index 0000000000..eae06f43bd
--- /dev/null
+++ b/lib/lufa/Projects/Webserver/Lib/uip/timer.c
@@ -0,0 +1,128 @@
+/**
+ * \addtogroup timer
+ * @{
+ */
+
+/**
+ * \file
+ * Timer library implementation.
+ * \author
+ * Adam Dunkels <adam@sics.se>
+ */
+
+/*
+ * Copyright (c) 2004, Swedish Institute of Computer Science.
+ * 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. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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.
+ *
+ * This file is part of the uIP TCP/IP stack
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ * $Id: timer.c,v 1.2 2006/06/12 08:00:30 adam Exp $
+ */
+
+#include "clock.h"
+#include "timer.h"
+
+/*---------------------------------------------------------------------------*/
+/**
+ * Set a timer.
+ *
+ * This function is used to set a timer for a time sometime in the
+ * future. The function timer_expired() will evaluate to true after
+ * the timer has expired.
+ *
+ * \param t A pointer to the timer
+ * \param interval The interval before the timer expires.
+ *
+ */
+void
+timer_set(struct timer *t, clock_time_t interval)
+{
+  t->interval = interval;
+  t->start = clock_time();
+}
+/*---------------------------------------------------------------------------*/
+/**
+ * Reset the timer with the same interval.
+ *
+ * This function resets the timer with the same interval that was
+ * given to the timer_set() function. The start point of the interval
+ * is the exact time that the timer last expired. Therefore, this
+ * function will cause the timer to be stable over time, unlike the
+ * timer_restart() function.
+ *
+ * \param t A pointer to the timer.
+ *
+ * \sa timer_restart()
+ */
+void
+timer_reset(struct timer *t)
+{
+  t->start += t->interval;
+}
+/*---------------------------------------------------------------------------*/
+/**
+ * Restart the timer from the current point in time
+ *
+ * This function restarts a timer with the same interval that was
+ * given to the timer_set() function. The timer will start at the
+ * current time.
+ *
+ * \note A periodic timer will drift if this function is used to reset
+ * it. For periodic timers, use the timer_reset() function instead.
+ *
+ * \param t A pointer to the timer.
+ *
+ * \sa timer_reset()
+ */
+void
+timer_restart(struct timer *t)
+{
+  t->start = clock_time();
+}
+/*---------------------------------------------------------------------------*/
+/**
+ * Check if a timer has expired.
+ *
+ * This function tests if a timer has expired and returns true or
+ * false depending on its status.
+ *
+ * \param t A pointer to the timer
+ *
+ * \return Non-zero if the timer has expired, zero otherwise.
+ *
+ */
+int
+timer_expired(struct timer *t)
+{
+  return (clock_time_t)(clock_time() - t->start) >= (clock_time_t)t->interval;
+}
+/*---------------------------------------------------------------------------*/
+
+/** @} */
+
diff --git a/lib/lufa/Projects/Webserver/Lib/uip/timer.h b/lib/lufa/Projects/Webserver/Lib/uip/timer.h
new file mode 100644
index 0000000000..04917e4c52
--- /dev/null
+++ b/lib/lufa/Projects/Webserver/Lib/uip/timer.h
@@ -0,0 +1,87 @@
+/**
+ * \defgroup timer Timer library
+ *
+ * The timer library provides functions for setting, resetting and
+ * restarting timers, and for checking if a timer has expired. An
+ * application must "manually" check if its timers have expired; this
+ * is not done automatically.
+ *
+ * A timer is declared as a \c struct \c timer and all access to the
+ * timer is made by a pointer to the declared timer.
+ *
+ * \note The timer library uses the \ref clock "Clock library" to
+ * measure time. Intervals should be specified in the format used by
+ * the clock library.
+ *
+ * @{
+ */
+
+
+/**
+ * \file
+ * Timer library header file.
+ * \author
+ * Adam Dunkels <adam@sics.se>
+ */
+
+/*
+ * Copyright (c) 2004, Swedish Institute of Computer Science.
+ * 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. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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.
+ *
+ * This file is part of the uIP TCP/IP stack
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ * $Id: timer.h,v 1.3 2006/06/11 21:46:39 adam Exp $
+ */
+#ifndef __TIMER_H__
+#define __TIMER_H__
+
+#include "clock.h"
+
+/**
+ * A timer.
+ *
+ * This structure is used for declaring a timer. The timer must be set
+ * with timer_set() before it can be used.
+ *
+ * \hideinitializer
+ */
+struct timer {
+  clock_time_t start;
+  clock_time_t interval;
+};
+
+void timer_set(struct timer *t, clock_time_t interval);
+void timer_reset(struct timer *t);
+void timer_restart(struct timer *t);
+int timer_expired(struct timer *t);
+
+#endif /* __TIMER_H__ */
+
+/** @} */
+
diff --git a/lib/lufa/Projects/Webserver/Lib/uip/uip-split.c b/lib/lufa/Projects/Webserver/Lib/uip/uip-split.c
new file mode 100644
index 0000000000..5222a05b63
--- /dev/null
+++ b/lib/lufa/Projects/Webserver/Lib/uip/uip-split.c
@@ -0,0 +1,151 @@
+/*
+ * Copyright (c) 2004, Swedish Institute of Computer Science.
+ * 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. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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.
+ *
+ * This file is part of the Contiki operating system.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ * $Id: uip-split.c,v 1.2 2008/10/14 13:39:12 julienabeille Exp $
+ */
+
+#include "uip-split.h"
+
+
+#define BUF ((struct uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
+
+/*-----------------------------------------------------------------------------*/
+void
+uip_split_output(void)
+{
+#if UIP_TCP
+  u16_t tcplen, len1, len2;
+
+  /* We only try to split maximum sized TCP segments. */
+  if(BUF->proto == UIP_PROTO_TCP  && uip_len == UIP_BUFSIZE) {
+
+    tcplen = uip_len - UIP_TCPIP_HLEN - UIP_LLH_LEN;
+    /* Split the segment in two. If the original packet length was
+       odd, we make the second packet one byte larger. */
+    len1 = len2 = tcplen / 2;
+    if(len1 + len2 < tcplen) {
+      ++len2;
+    }
+
+    /* Create the first packet. This is done by altering the length
+       field of the IP header and updating the checksums. */
+    uip_len = len1 + UIP_TCPIP_HLEN + UIP_LLH_LEN;
+#if UIP_CONF_IPV6
+    /* For IPv6, the IP length field does not include the IPv6 IP header
+       length. */
+    BUF->len[0] = ((uip_len - UIP_IPH_LEN) >> 8);
+    BUF->len[1] = ((uip_len - UIP_IPH_LEN) & 0xff);
+#else /* UIP_CONF_IPV6 */
+    BUF->len[0] = (uip_len - UIP_LLH_LEN) >> 8;
+    BUF->len[1] = (uip_len - UIP_LLH_LEN) & 0xff;
+#endif /* UIP_CONF_IPV6 */
+
+    /* Recalculate the TCP checksum. */
+    BUF->tcpchksum = 0;
+    BUF->tcpchksum = ~(uip_tcpchksum());
+
+#if !UIP_CONF_IPV6
+    /* Recalculate the IP checksum. */
+    BUF->ipchksum = 0;
+    BUF->ipchksum = ~(uip_ipchksum());
+#endif /* UIP_CONF_IPV6 */
+
+    /* Transmit the first packet. */
+#if UIP_CONF_IPV6
+    tcpip_ipv6_output();
+#else
+	if (USB_CurrentMode == USB_MODE_Device)
+	  RNDIS_Device_SendPacket(&Ethernet_RNDIS_Interface_Device, uip_buf, uip_len);
+	else
+	  RNDIS_Host_SendPacket(&Ethernet_RNDIS_Interface_Host, uip_buf, uip_len);
+#endif /* UIP_CONF_IPV6 */
+
+    /* Now, create the second packet. To do this, it is not enough to
+       just alter the length field, but we must also update the TCP
+       sequence number and point the uip_appdata to a new place in
+       memory. This place is determined by the length of the first
+       packet (len1). */
+    uip_len = len2 + UIP_TCPIP_HLEN + UIP_LLH_LEN;
+#if UIP_CONF_IPV6
+    /* For IPv6, the IP length field does not include the IPv6 IP header
+       length. */
+    BUF->len[0] = ((uip_len - UIP_IPH_LEN) >> 8);
+    BUF->len[1] = ((uip_len - UIP_IPH_LEN) & 0xff);
+#else /* UIP_CONF_IPV6 */
+    BUF->len[0] = (uip_len  - UIP_LLH_LEN) >> 8;
+    BUF->len[1] = (uip_len - UIP_LLH_LEN) & 0xff;
+#endif /* UIP_CONF_IPV6 */
+
+    memcpy(uip_appdata, (u8_t *)uip_appdata + len1, len2);
+
+    uip_add32(BUF->seqno, len1);
+    BUF->seqno[0] = uip_acc32[0];
+    BUF->seqno[1] = uip_acc32[1];
+    BUF->seqno[2] = uip_acc32[2];
+    BUF->seqno[3] = uip_acc32[3];
+
+    /* Recalculate the TCP checksum. */
+    BUF->tcpchksum = 0;
+    BUF->tcpchksum = ~(uip_tcpchksum());
+
+#if !UIP_CONF_IPV6
+    /* Recalculate the IP checksum. */
+    BUF->ipchksum = 0;
+    BUF->ipchksum = ~(uip_ipchksum());
+#endif /* UIP_CONF_IPV6 */
+
+    /* Transmit the second packet. */
+#if UIP_CONF_IPV6
+    tcpip_ipv6_output();
+#else
+	if (USB_CurrentMode == USB_MODE_Device)
+	  RNDIS_Device_SendPacket(&Ethernet_RNDIS_Interface_Device, uip_buf, uip_len);
+	else
+	  RNDIS_Host_SendPacket(&Ethernet_RNDIS_Interface_Host, uip_buf, uip_len);
+#endif /* UIP_CONF_IPV6 */
+    return;
+  }
+#endif /* UIP_TCP */
+
+  /*    uip_fw_output();*/
+#if UIP_CONF_IPV6
+	tcpip_ipv6_output();
+#else
+	if (USB_CurrentMode == USB_MODE_Device)
+	  RNDIS_Device_SendPacket(&Ethernet_RNDIS_Interface_Device, uip_buf, uip_len);
+	else
+	  RNDIS_Host_SendPacket(&Ethernet_RNDIS_Interface_Host, uip_buf, uip_len);
+#endif /* UIP_CONF_IPV6 */
+}
+
+/*-----------------------------------------------------------------------------*/
+
diff --git a/lib/lufa/Projects/Webserver/Lib/uip/uip-split.h b/lib/lufa/Projects/Webserver/Lib/uip/uip-split.h
new file mode 100644
index 0000000000..0c768ce40a
--- /dev/null
+++ b/lib/lufa/Projects/Webserver/Lib/uip/uip-split.h
@@ -0,0 +1,104 @@
+/*
+ * Copyright (c) 2004, Swedish Institute of Computer Science.
+ * 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. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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.
+ *
+ * This file is part of the Contiki operating system.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ * $Id: uip-split.h,v 1.1 2006/06/17 22:41:19 adamdunkels Exp $
+ */
+/**
+ * \addtogroup uip
+ * @{
+ */
+
+/**
+ * \defgroup uipsplit uIP TCP throughput booster hack
+ * @{
+ *
+ * The basic uIP TCP implementation only allows each TCP connection to
+ * have a single TCP segment in flight at any given time. Because of
+ * the delayed ACK algorithm employed by most TCP receivers, uIP's
+ * limit on the amount of in-flight TCP segments seriously reduces the
+ * maximum achievable throughput for sending data from uIP.
+ *
+ * The uip-split module is a hack which tries to remedy this
+ * situation. By splitting maximum sized outgoing TCP segments into
+ * two, the delayed ACK algorithm is not invoked at TCP
+ * receivers. This improves the throughput when sending data from uIP
+ * by orders of magnitude.
+ *
+ * The uip-split module uses the uip-fw module (uIP IP packet
+ * forwarding) for sending packets. Therefore, the uip-fw module must
+ * be set up with the appropriate network interfaces for this module
+ * to work.
+ */
+
+
+/**
+ * \file
+ * Module for splitting outbound TCP segments in two to avoid the
+ * delayed ACK throughput degradation.
+ * \author
+ * Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#ifndef __UIP_SPLIT_H__
+#define __UIP_SPLIT_H__
+
+#include <string.h>
+#include <uip.h>
+
+#include "../../USBHostMode.h"
+
+#include <LUFA/Drivers/USB/USB.h>
+
+/**
+ * Handle outgoing packets.
+ *
+ * This function inspects an outgoing packet in the uip_buf buffer and
+ * sends it out using the uip_fw_output() function. If the packet is a
+ * full-sized TCP segment it will be split into two segments and
+ * transmitted separately. This function should be called instead of
+ * the actual device driver output function, or the uip_fw_output()
+ * function.
+ *
+ * The headers of the outgoing packet is assumed to be in the uip_buf
+ * buffer and the payload is assumed to be wherever uip_appdata
+ * points. The length of the outgoing packet is assumed to be in the
+ * uip_len variable.
+ *
+ */
+void uip_split_output(void);
+void uip_add32(u8_t *op32, u16_t op16);
+#endif /* __UIP_SPLIT_H__ */
+
+/** @} */
+/** @} */
+
diff --git a/lib/lufa/Projects/Webserver/Lib/uip/uip.c b/lib/lufa/Projects/Webserver/Lib/uip/uip.c
new file mode 100644
index 0000000000..fead75775c
--- /dev/null
+++ b/lib/lufa/Projects/Webserver/Lib/uip/uip.c
@@ -0,0 +1,1941 @@
+#define DEBUG_PRINTF(...) /*printf(__VA_ARGS__)*/
+
+/**
+ * \addtogroup uip
+ * @{
+ */
+
+/**
+ * \file
+ * The uIP TCP/IP stack code.
+ * \author Adam Dunkels <adam@dunkels.com>
+ */
+
+/*
+ * Copyright (c) 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.
+ *
+ * This file is part of the uIP TCP/IP stack.
+ *
+ * $Id: uip.c,v 1.15 2008/10/15 08:08:32 adamdunkels Exp $
+ *
+ */
+
+/*
+ * uIP is a small implementation of the IP, UDP and TCP protocols (as
+ * well as some basic ICMP stuff). The implementation couples the IP,
+ * UDP, TCP and the application layers very tightly. To keep the size
+ * of the compiled code down, this code frequently uses the goto
+ * statement. While it would be possible to break the uip_process()
+ * function into many smaller functions, this would increase the code
+ * size because of the overhead of parameter passing and the fact that
+ * the optimizer would not be as efficient.
+ *
+ * The principle is that we have a small buffer, called the uip_buf,
+ * in which the device driver puts an incoming packet. The TCP/IP
+ * stack parses the headers in the packet, and calls the
+ * application. If the remote host has sent data to the application,
+ * this data is present in the uip_buf and the application read the
+ * data from there. It is up to the application to put this data into
+ * a byte stream if needed. The application will not be fed with data
+ * that is out of sequence.
+ *
+ * If the application whishes to send data to the peer, it should put
+ * its data into the uip_buf. The uip_appdata pointer points to the
+ * first available byte. The TCP/IP stack will calculate the
+ * checksums, and fill in the necessary header fields and finally send
+ * the packet back to the peer.
+*/
+
+#include "uip.h"
+#include "uipopt.h"
+#include "uip_arp.h"
+
+#if !UIP_CONF_IPV6 /* If UIP_CONF_IPV6 is defined, we compile the
+		      uip6.c file instead of this one. Therefore
+		      this #ifndef removes the entire compilation
+		      output of the uip.c file */
+
+
+#if UIP_CONF_IPV6
+#include "net/uip-neighbor.h"
+#endif /* UIP_CONF_IPV6 */
+
+#include <string.h>
+
+/*---------------------------------------------------------------------------*/
+/* Variable definitions. */
+
+
+/* The IP address of this host. If it is defined to be fixed (by
+   setting UIP_FIXEDADDR to 1 in uipopt.h), the address is set
+   here. Otherwise, the address */
+#if UIP_FIXEDADDR > 0
+const uip_ipaddr_t uip_hostaddr =
+  { UIP_IPADDR0, UIP_IPADDR1, UIP_IPADDR2, UIP_IPADDR3 };
+const uip_ipaddr_t uip_draddr =
+  { UIP_DRIPADDR0, UIP_DRIPADDR1, UIP_DRIPADDR2, UIP_DRIPADDR3 };
+const uip_ipaddr_t uip_netmask =
+  { UIP_NETMASK0, UIP_NETMASK1, UIP_NETMASK2, UIP_NETMASK3 };
+#else
+uip_ipaddr_t uip_hostaddr, uip_draddr, uip_netmask;
+#endif /* UIP_FIXEDADDR */
+
+const uip_ipaddr_t uip_broadcast_addr =
+#if UIP_CONF_IPV6
+  { { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+      0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff } };
+#else /* UIP_CONF_IPV6 */
+  { { 0xff, 0xff, 0xff, 0xff } };
+#endif /* UIP_CONF_IPV6 */
+const uip_ipaddr_t uip_all_zeroes_addr = { { 0x0, /* rest is 0 */ } };
+
+#if UIP_FIXEDETHADDR
+const struct uip_eth_addr uip_ethaddr = {{UIP_ETHADDR0,
+					  UIP_ETHADDR1,
+					  UIP_ETHADDR2,
+					  UIP_ETHADDR3,
+					  UIP_ETHADDR4,
+					  UIP_ETHADDR5}};
+#else
+struct uip_eth_addr uip_ethaddr = {{0,0,0,0,0,0}};
+#endif
+
+#ifndef UIP_CONF_EXTERNAL_BUFFER
+u8_t uip_buf[UIP_BUFSIZE + 2];   /* The packet buffer that contains
+				    incoming packets. */
+#endif /* UIP_CONF_EXTERNAL_BUFFER */
+
+void *uip_appdata;               /* The uip_appdata pointer points to
+				    application data. */
+void *uip_sappdata;              /* The uip_appdata pointer points to
+				    the application data which is to
+				    be sent. */
+#if UIP_URGDATA > 0
+void *uip_urgdata;               /* The uip_urgdata pointer points to
+   				    urgent data (out-of-band data), if
+   				    present. */
+u16_t uip_urglen, uip_surglen;
+#endif /* UIP_URGDATA > 0 */
+
+u16_t uip_len, uip_slen;
+                             /* The uip_len is either 8 or 16 bits,
+				depending on the maximum packet
+				size. */
+
+u8_t uip_flags;     /* The uip_flags variable is used for
+				communication between the TCP/IP stack
+				and the application program. */
+struct uip_conn *uip_conn;   /* uip_conn always points to the current
+				connection. */
+
+struct uip_conn uip_conns[UIP_CONNS];
+                             /* The uip_conns array holds all TCP
+				connections. */
+u16_t uip_listenports[UIP_LISTENPORTS];
+                             /* The uip_listenports list all currently
+				listening ports. */
+#if UIP_UDP
+struct uip_udp_conn *uip_udp_conn;
+struct uip_udp_conn uip_udp_conns[UIP_UDP_CONNS];
+#endif /* UIP_UDP */
+
+static u16_t ipid;           /* Ths ipid variable is an increasing
+				number that is used for the IP ID
+				field. */
+
+void uip_setipid(u16_t id) { ipid = id; }
+
+static u8_t iss[4];          /* The iss variable is used for the TCP
+				initial sequence number. */
+
+#if UIP_ACTIVE_OPEN
+static u16_t lastport;       /* Keeps track of the last port used for
+				a new connection. */
+#endif /* UIP_ACTIVE_OPEN */
+
+/* Temporary variables. */
+u8_t uip_acc32[4];
+static u8_t c, opt;
+static u16_t tmp16;
+
+/* Structures and definitions. */
+#define TCP_FIN 0x01
+#define TCP_SYN 0x02
+#define TCP_RST 0x04
+#define TCP_PSH 0x08
+#define TCP_ACK 0x10
+#define TCP_URG 0x20
+#define TCP_CTL 0x3f
+
+#define TCP_OPT_END     0   /* End of TCP options list */
+#define TCP_OPT_NOOP    1   /* "No-operation" TCP option */
+#define TCP_OPT_MSS     2   /* Maximum segment size TCP option */
+
+#define TCP_OPT_MSS_LEN 4   /* Length of TCP MSS option. */
+
+#define ICMP_ECHO_REPLY 0
+#define ICMP_ECHO       8
+
+#define ICMP_DEST_UNREACHABLE        3
+#define ICMP_PORT_UNREACHABLE        3
+
+#define ICMP6_ECHO_REPLY             129
+#define ICMP6_ECHO                   128
+#define ICMP6_NEIGHBOR_SOLICITATION  135
+#define ICMP6_NEIGHBOR_ADVERTISEMENT 136
+
+#define ICMP6_FLAG_S (1 << 6)
+
+#define ICMP6_OPTION_SOURCE_LINK_ADDRESS 1
+#define ICMP6_OPTION_TARGET_LINK_ADDRESS 2
+
+
+/* Macros. */
+#define BUF ((struct uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
+#define FBUF ((struct uip_tcpip_hdr *)&uip_reassbuf[0])
+#define ICMPBUF ((struct uip_icmpip_hdr *)&uip_buf[UIP_LLH_LEN])
+#define UDPBUF ((struct uip_udpip_hdr *)&uip_buf[UIP_LLH_LEN])
+
+
+#if UIP_STATISTICS == 1
+struct uip_stats uip_stat;
+#define UIP_STAT(s) s
+#else
+#define UIP_STAT(s)
+#endif /* UIP_STATISTICS == 1 */
+
+#if UIP_LOGGING == 1
+#include <stdio.h>
+void uip_log(char *msg);
+#define UIP_LOG(m) uip_log(m)
+#else
+#define UIP_LOG(m)
+#endif /* UIP_LOGGING == 1 */
+
+#if ! UIP_ARCH_ADD32
+void
+uip_add32(u8_t *op32, u16_t op16)
+{
+  uip_acc32[3] = op32[3] + (op16 & 0xff);
+  uip_acc32[2] = op32[2] + (op16 >> 8);
+  uip_acc32[1] = op32[1];
+  uip_acc32[0] = op32[0];
+
+  if(uip_acc32[2] < (op16 >> 8)) {
+    ++uip_acc32[1];
+    if(uip_acc32[1] == 0) {
+      ++uip_acc32[0];
+    }
+  }
+
+
+  if(uip_acc32[3] < (op16 & 0xff)) {
+    ++uip_acc32[2];
+    if(uip_acc32[2] == 0) {
+      ++uip_acc32[1];
+      if(uip_acc32[1] == 0) {
+	++uip_acc32[0];
+      }
+    }
+  }
+}
+
+#endif /* UIP_ARCH_ADD32 */
+
+#if ! UIP_ARCH_CHKSUM
+/*---------------------------------------------------------------------------*/
+static u16_t
+chksum(u16_t sum, const u8_t *data, u16_t len)
+{
+  u16_t t;
+  const u8_t *dataptr;
+  const u8_t *last_byte;
+
+  dataptr = data;
+  last_byte = data + len - 1;
+
+  while(dataptr < last_byte) {	/* At least two more bytes */
+    t = (dataptr[0] << 8) + dataptr[1];
+    sum += t;
+    if(sum < t) {
+      sum++;		/* carry */
+    }
+    dataptr += 2;
+  }
+
+  if(dataptr == last_byte) {
+    t = (dataptr[0] << 8) + 0;
+    sum += t;
+    if(sum < t) {
+      sum++;		/* carry */
+    }
+  }
+
+  /* Return sum in host byte order. */
+  return sum;
+}
+/*---------------------------------------------------------------------------*/
+u16_t
+uip_chksum(u16_t *data, u16_t len)
+{
+  return htons(chksum(0, (u8_t *)data, len));
+}
+/*---------------------------------------------------------------------------*/
+#ifndef UIP_ARCH_IPCHKSUM
+u16_t
+uip_ipchksum(void)
+{
+  u16_t sum;
+
+  sum = chksum(0, &uip_buf[UIP_LLH_LEN], UIP_IPH_LEN);
+  DEBUG_PRINTF("uip_ipchksum: sum 0x%04x\n", sum);
+  return (sum == 0) ? 0xffff : htons(sum);
+}
+#endif
+/*---------------------------------------------------------------------------*/
+static u16_t
+upper_layer_chksum(u8_t proto)
+{
+  u16_t upper_layer_len;
+  u16_t sum;
+
+#if UIP_CONF_IPV6
+  upper_layer_len = (((u16_t)(BUF->len[0]) << 8) + BUF->len[1]);
+#else /* UIP_CONF_IPV6 */
+  upper_layer_len = (((u16_t)(BUF->len[0]) << 8) + BUF->len[1]) - UIP_IPH_LEN;
+#endif /* UIP_CONF_IPV6 */
+
+  /* First sum pseudo-header. */
+
+  /* IP protocol and length fields. This addition cannot carry. */
+  sum = upper_layer_len + proto;
+  /* Sum IP source and destination addresses. */
+  sum = chksum(sum, (u8_t *)&BUF->srcipaddr, 2 * sizeof(uip_ipaddr_t));
+
+  /* Sum TCP header and data. */
+  sum = chksum(sum, &uip_buf[UIP_IPH_LEN + UIP_LLH_LEN],
+	       upper_layer_len);
+
+  return (sum == 0) ? 0xffff : htons(sum);
+}
+/*---------------------------------------------------------------------------*/
+#if UIP_CONF_IPV6
+u16_t
+uip_icmp6chksum(void)
+{
+  return upper_layer_chksum(UIP_PROTO_ICMP6);
+
+}
+#endif /* UIP_CONF_IPV6 */
+/*---------------------------------------------------------------------------*/
+u16_t
+uip_tcpchksum(void)
+{
+  return upper_layer_chksum(UIP_PROTO_TCP);
+}
+/*---------------------------------------------------------------------------*/
+#if UIP_UDP_CHECKSUMS
+u16_t
+uip_udpchksum(void)
+{
+  return upper_layer_chksum(UIP_PROTO_UDP);
+}
+#endif /* UIP_UDP_CHECKSUMS */
+#endif /* UIP_ARCH_CHKSUM */
+/*---------------------------------------------------------------------------*/
+void
+uip_init(void)
+{
+  for(c = 0; c < UIP_LISTENPORTS; ++c) {
+    uip_listenports[c] = 0;
+  }
+  for(c = 0; c < UIP_CONNS; ++c) {
+    uip_conns[c].tcpstateflags = UIP_CLOSED;
+  }
+#if UIP_ACTIVE_OPEN
+  lastport = 1024;
+#endif /* UIP_ACTIVE_OPEN */
+
+#if UIP_UDP
+  for(c = 0; c < UIP_UDP_CONNS; ++c) {
+    uip_udp_conns[c].lport = 0;
+  }
+#endif /* UIP_UDP */
+
+
+  /* IPv4 initialization. */
+#if UIP_FIXEDADDR == 0
+  /*  uip_hostaddr[0] = uip_hostaddr[1] = 0;*/
+#endif /* UIP_FIXEDADDR */
+
+}
+/*---------------------------------------------------------------------------*/
+#if UIP_ACTIVE_OPEN
+struct uip_conn *
+uip_connect(uip_ipaddr_t *ripaddr, u16_t rport)
+{
+  register struct uip_conn *conn, *cconn;
+
+  /* Find an unused local port. */
+ again:
+  ++lastport;
+
+  if(lastport >= 32000) {
+    lastport = 4096;
+  }
+
+  /* Check if this port is already in use, and if so try to find
+     another one. */
+  for(c = 0; c < UIP_CONNS; ++c) {
+    conn = &uip_conns[c];
+    if(conn->tcpstateflags != UIP_CLOSED &&
+       conn->lport == htons(lastport)) {
+      goto again;
+    }
+  }
+
+  conn = 0;
+  for(c = 0; c < UIP_CONNS; ++c) {
+    cconn = &uip_conns[c];
+    if(cconn->tcpstateflags == UIP_CLOSED) {
+      conn = cconn;
+      break;
+    }
+    if(cconn->tcpstateflags == UIP_TIME_WAIT) {
+      if(conn == 0 ||
+	 cconn->timer > conn->timer) {
+	conn = cconn;
+      }
+    }
+  }
+
+  if(conn == 0) {
+    return 0;
+  }
+
+  conn->tcpstateflags = UIP_SYN_SENT;
+
+  conn->snd_nxt[0] = iss[0];
+  conn->snd_nxt[1] = iss[1];
+  conn->snd_nxt[2] = iss[2];
+  conn->snd_nxt[3] = iss[3];
+
+  conn->initialmss = conn->mss = UIP_TCP_MSS;
+
+  conn->len = 1;   /* TCP length of the SYN is one. */
+  conn->nrtx = 0;
+  conn->timer = 1; /* Send the SYN next time around. */
+  conn->rto = UIP_RTO;
+  conn->sa = 0;
+  conn->sv = 16;   /* Initial value of the RTT variance. */
+  conn->lport = htons(lastport);
+  conn->rport = rport;
+  uip_ipaddr_copy(&conn->ripaddr, ripaddr);
+
+  return conn;
+}
+#endif /* UIP_ACTIVE_OPEN */
+/*---------------------------------------------------------------------------*/
+#if UIP_UDP
+struct uip_udp_conn *
+uip_udp_new(const uip_ipaddr_t *ripaddr, u16_t rport)
+{
+  register struct uip_udp_conn *conn;
+
+  /* Find an unused local port. */
+ again:
+  ++lastport;
+
+  if(lastport >= 32000) {
+    lastport = 4096;
+  }
+
+  for(c = 0; c < UIP_UDP_CONNS; ++c) {
+    if(uip_udp_conns[c].lport == htons(lastport)) {
+      goto again;
+    }
+  }
+
+
+  conn = 0;
+  for(c = 0; c < UIP_UDP_CONNS; ++c) {
+    if(uip_udp_conns[c].lport == 0) {
+      conn = &uip_udp_conns[c];
+      break;
+    }
+  }
+
+  if(conn == 0) {
+    return 0;
+  }
+
+  conn->lport = HTONS(lastport);
+  conn->rport = rport;
+  if(ripaddr == NULL) {
+    memset(&conn->ripaddr, 0, sizeof(uip_ipaddr_t));
+  } else {
+    uip_ipaddr_copy(&conn->ripaddr, ripaddr);
+  }
+  conn->ttl = UIP_TTL;
+
+  return conn;
+}
+#endif /* UIP_UDP */
+/*---------------------------------------------------------------------------*/
+void
+uip_unlisten(u16_t port)
+{
+  for(c = 0; c < UIP_LISTENPORTS; ++c) {
+    if(uip_listenports[c] == port) {
+      uip_listenports[c] = 0;
+      return;
+    }
+  }
+}
+/*---------------------------------------------------------------------------*/
+void
+uip_listen(u16_t port)
+{
+  for(c = 0; c < UIP_LISTENPORTS; ++c) {
+    if(uip_listenports[c] == 0) {
+      uip_listenports[c] = port;
+      return;
+    }
+  }
+}
+/*---------------------------------------------------------------------------*/
+/* XXX: IP fragment reassembly: not well-tested. */
+
+#if UIP_REASSEMBLY && !UIP_CONF_IPV6
+#define UIP_REASS_BUFSIZE (UIP_BUFSIZE - UIP_LLH_LEN)
+static u8_t uip_reassbuf[UIP_REASS_BUFSIZE];
+static u8_t uip_reassbitmap[UIP_REASS_BUFSIZE / (8 * 8)];
+static const u8_t bitmap_bits[8] = {0xff, 0x7f, 0x3f, 0x1f,
+				    0x0f, 0x07, 0x03, 0x01};
+static u16_t uip_reasslen;
+static u8_t uip_reassflags;
+#define UIP_REASS_FLAG_LASTFRAG 0x01
+static u8_t uip_reasstmr;
+
+#define IP_MF   0x20
+
+static u8_t
+uip_reass(void)
+{
+  u16_t offset, len;
+  u16_t i;
+
+  /* If ip_reasstmr is zero, no packet is present in the buffer, so we
+     write the IP header of the fragment into the reassembly
+     buffer. The timer is updated with the maximum age. */
+  if(uip_reasstmr == 0) {
+    memcpy(uip_reassbuf, &BUF->vhl, UIP_IPH_LEN);
+    uip_reasstmr = UIP_REASS_MAXAGE;
+    uip_reassflags = 0;
+    /* Clear the bitmap. */
+    memset(uip_reassbitmap, 0, sizeof(uip_reassbitmap));
+  }
+
+  /* Check if the incoming fragment matches the one currently present
+     in the reasembly buffer. If so, we proceed with copying the
+     fragment into the buffer. */
+  if(BUF->srcipaddr[0] == FBUF->srcipaddr[0] &&
+     BUF->srcipaddr[1] == FBUF->srcipaddr[1] &&
+     BUF->destipaddr[0] == FBUF->destipaddr[0] &&
+     BUF->destipaddr[1] == FBUF->destipaddr[1] &&
+     BUF->ipid[0] == FBUF->ipid[0] &&
+     BUF->ipid[1] == FBUF->ipid[1]) {
+
+    len = (BUF->len[0] << 8) + BUF->len[1] - (BUF->vhl & 0x0f) * 4;
+    offset = (((BUF->ipoffset[0] & 0x3f) << 8) + BUF->ipoffset[1]) * 8;
+
+    /* If the offset or the offset + fragment length overflows the
+       reassembly buffer, we discard the entire packet. */
+    if(offset > UIP_REASS_BUFSIZE ||
+       offset + len > UIP_REASS_BUFSIZE) {
+      uip_reasstmr = 0;
+      goto nullreturn;
+    }
+
+    /* Copy the fragment into the reassembly buffer, at the right
+       offset. */
+    memcpy(&uip_reassbuf[UIP_IPH_LEN + offset],
+	   (char *)BUF + (int)((BUF->vhl & 0x0f) * 4),
+	   len);
+
+    /* Update the bitmap. */
+    if(offset / (8 * 8) == (offset + len) / (8 * 8)) {
+      /* If the two endpoints are in the same byte, we only update
+	 that byte. */
+
+      uip_reassbitmap[offset / (8 * 8)] |=
+	     bitmap_bits[(offset / 8 ) & 7] &
+	     ~bitmap_bits[((offset + len) / 8 ) & 7];
+    } else {
+      /* If the two endpoints are in different bytes, we update the
+	 bytes in the endpoints and fill the stuff in-between with
+	 0xff. */
+      uip_reassbitmap[offset / (8 * 8)] |=
+	bitmap_bits[(offset / 8 ) & 7];
+      for(i = 1 + offset / (8 * 8); i < (offset + len) / (8 * 8); ++i) {
+	uip_reassbitmap[i] = 0xff;
+      }
+      uip_reassbitmap[(offset + len) / (8 * 8)] |=
+	~bitmap_bits[((offset + len) / 8 ) & 7];
+    }
+
+    /* If this fragment has the More Fragments flag set to zero, we
+       know that this is the last fragment, so we can calculate the
+       size of the entire packet. We also set the
+       IP_REASS_FLAG_LASTFRAG flag to indicate that we have received
+       the final fragment. */
+
+    if((BUF->ipoffset[0] & IP_MF) == 0) {
+      uip_reassflags |= UIP_REASS_FLAG_LASTFRAG;
+      uip_reasslen = offset + len;
+    }
+
+    /* Finally, we check if we have a full packet in the buffer. We do
+       this by checking if we have the last fragment and if all bits
+       in the bitmap are set. */
+    if(uip_reassflags & UIP_REASS_FLAG_LASTFRAG) {
+      /* Check all bytes up to and including all but the last byte in
+	 the bitmap. */
+      for(i = 0; i < uip_reasslen / (8 * 8) - 1; ++i) {
+	if(uip_reassbitmap[i] != 0xff) {
+	  goto nullreturn;
+	}
+      }
+      /* Check the last byte in the bitmap. It should contain just the
+	 right amount of bits. */
+      if(uip_reassbitmap[uip_reasslen / (8 * 8)] !=
+	 (u8_t)~bitmap_bits[uip_reasslen / 8 & 7]) {
+	goto nullreturn;
+      }
+
+      /* If we have come this far, we have a full packet in the
+	 buffer, so we allocate a pbuf and copy the packet into it. We
+	 also reset the timer. */
+      uip_reasstmr = 0;
+      memcpy(BUF, FBUF, uip_reasslen);
+
+      /* Pretend to be a "normal" (i.e., not fragmented) IP packet
+	 from now on. */
+      BUF->ipoffset[0] = BUF->ipoffset[1] = 0;
+      BUF->len[0] = uip_reasslen >> 8;
+      BUF->len[1] = uip_reasslen & 0xff;
+      BUF->ipchksum = 0;
+      BUF->ipchksum = ~(uip_ipchksum());
+
+      return uip_reasslen;
+    }
+  }
+
+ nullreturn:
+  return 0;
+}
+#endif /* UIP_REASSEMBLY */
+/*---------------------------------------------------------------------------*/
+static void
+uip_add_rcv_nxt(u16_t n)
+{
+  uip_add32(uip_conn->rcv_nxt, n);
+  uip_conn->rcv_nxt[0] = uip_acc32[0];
+  uip_conn->rcv_nxt[1] = uip_acc32[1];
+  uip_conn->rcv_nxt[2] = uip_acc32[2];
+  uip_conn->rcv_nxt[3] = uip_acc32[3];
+}
+/*---------------------------------------------------------------------------*/
+void
+uip_process(u8_t flag)
+{
+  register struct uip_conn *uip_connr = uip_conn;
+
+#if UIP_UDP
+  if(flag == UIP_UDP_SEND_CONN) {
+    goto udp_send;
+  }
+#endif /* UIP_UDP */
+
+  uip_sappdata = uip_appdata = &uip_buf[UIP_IPTCPH_LEN + UIP_LLH_LEN];
+
+  /* Check if we were invoked because of a poll request for a
+     particular connection. */
+  if(flag == UIP_POLL_REQUEST) {
+    if((uip_connr->tcpstateflags & UIP_TS_MASK) == UIP_ESTABLISHED &&
+       !uip_outstanding(uip_connr)) {
+	uip_len = uip_slen = 0;
+	uip_flags = UIP_POLL;
+	UIP_APPCALL();
+	goto appsend;
+    }
+    goto drop;
+
+    /* Check if we were invoked because of the periodic timer firing. */
+  } else if(flag == UIP_TIMER) {
+#if UIP_REASSEMBLY
+    if(uip_reasstmr != 0) {
+      --uip_reasstmr;
+    }
+#endif /* UIP_REASSEMBLY */
+    /* Increase the initial sequence number. */
+    if(++iss[3] == 0) {
+      if(++iss[2] == 0) {
+	if(++iss[1] == 0) {
+	  ++iss[0];
+	}
+      }
+    }
+
+    /* Reset the length variables. */
+    uip_len = 0;
+    uip_slen = 0;
+
+    /* Check if the connection is in a state in which we simply wait
+       for the connection to time out. If so, we increase the
+       connection's timer and remove the connection if it times
+       out. */
+    if(uip_connr->tcpstateflags == UIP_TIME_WAIT ||
+       uip_connr->tcpstateflags == UIP_FIN_WAIT_2) {
+      ++(uip_connr->timer);
+      if(uip_connr->timer == UIP_TIME_WAIT_TIMEOUT) {
+	uip_connr->tcpstateflags = UIP_CLOSED;
+      }
+    } else if(uip_connr->tcpstateflags != UIP_CLOSED) {
+      /* If the connection has outstanding data, we increase the
+	 connection's timer and see if it has reached the RTO value
+	 in which case we retransmit. */
+      if(uip_outstanding(uip_connr)) {
+	if(uip_connr->timer-- == 0) {
+	  if(uip_connr->nrtx == UIP_MAXRTX ||
+	     ((uip_connr->tcpstateflags == UIP_SYN_SENT ||
+	       uip_connr->tcpstateflags == UIP_SYN_RCVD) &&
+	      uip_connr->nrtx == UIP_MAXSYNRTX)) {
+	    uip_connr->tcpstateflags = UIP_CLOSED;
+
+	    /* We call UIP_APPCALL() with uip_flags set to
+	       UIP_TIMEDOUT to inform the application that the
+	       connection has timed out. */
+	    uip_flags = UIP_TIMEDOUT;
+	    UIP_APPCALL();
+
+	    /* We also send a reset packet to the remote host. */
+	    BUF->flags = TCP_RST | TCP_ACK;
+	    goto tcp_send_nodata;
+	  }
+
+	  /* Exponential back-off. */
+	  uip_connr->timer = UIP_RTO << (uip_connr->nrtx > 4?
+					 4:
+					 uip_connr->nrtx);
+	  ++(uip_connr->nrtx);
+
+	  /* Ok, so we need to retransmit. We do this differently
+	     depending on which state we are in. In ESTABLISHED, we
+	     call upon the application so that it may prepare the
+	     data for the retransmit. In SYN_RCVD, we resend the
+	     SYNACK that we sent earlier and in LAST_ACK we have to
+	     retransmit our FINACK. */
+	  UIP_STAT(++uip_stat.tcp.rexmit);
+	  switch(uip_connr->tcpstateflags & UIP_TS_MASK) {
+	  case UIP_SYN_RCVD:
+	    /* In the SYN_RCVD state, we should retransmit our
+               SYNACK. */
+	    goto tcp_send_synack;
+
+#if UIP_ACTIVE_OPEN
+	  case UIP_SYN_SENT:
+	    /* In the SYN_SENT state, we retransmit out SYN. */
+	    BUF->flags = 0;
+	    goto tcp_send_syn;
+#endif /* UIP_ACTIVE_OPEN */
+
+	  case UIP_ESTABLISHED:
+	    /* In the ESTABLISHED state, we call upon the application
+               to do the actual retransmit after which we jump into
+               the code for sending out the packet (the apprexmit
+               label). */
+	    uip_flags = UIP_REXMIT;
+	    UIP_APPCALL();
+	    goto apprexmit;
+
+	  case UIP_FIN_WAIT_1:
+	  case UIP_CLOSING:
+	  case UIP_LAST_ACK:
+	    /* In all these states we should retransmit a FINACK. */
+	    goto tcp_send_finack;
+
+	  }
+	}
+      } else if((uip_connr->tcpstateflags & UIP_TS_MASK) == UIP_ESTABLISHED) {
+	/* If there was no need for a retransmission, we poll the
+           application for new data. */
+	uip_len = uip_slen = 0;
+	uip_flags = UIP_POLL;
+	UIP_APPCALL();
+	goto appsend;
+      }
+    }
+    goto drop;
+  }
+#if UIP_UDP
+  if(flag == UIP_UDP_TIMER) {
+    if(uip_udp_conn->lport != 0) {
+      uip_conn = NULL;
+      uip_sappdata = uip_appdata = &uip_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN];
+      uip_len = uip_slen = 0;
+      uip_flags = UIP_POLL;
+      UIP_UDP_APPCALL();
+      goto udp_send;
+    } else {
+      goto drop;
+    }
+  }
+#endif
+
+  /* This is where the input processing starts. */
+  UIP_STAT(++uip_stat.ip.recv);
+
+  /* Start of IP input header processing code. */
+
+#if UIP_CONF_IPV6
+  /* Check validity of the IP header. */
+  if((BUF->vtc & 0xf0) != 0x60)  { /* IP version and header length. */
+    UIP_STAT(++uip_stat.ip.drop);
+    UIP_STAT(++uip_stat.ip.vhlerr);
+    UIP_LOG("ipv6: invalid version.");
+    goto drop;
+  }
+#else /* UIP_CONF_IPV6 */
+  /* Check validity of the IP header. */
+  if(BUF->vhl != 0x45)  { /* IP version and header length. */
+    UIP_STAT(++uip_stat.ip.drop);
+    UIP_STAT(++uip_stat.ip.vhlerr);
+    UIP_LOG("ip: invalid version or header length.");
+    goto drop;
+  }
+#endif /* UIP_CONF_IPV6 */
+
+  /* Check the size of the packet. If the size reported to us in
+     uip_len is smaller the size reported in the IP header, we assume
+     that the packet has been corrupted in transit. If the size of
+     uip_len is larger than the size reported in the IP packet header,
+     the packet has been padded and we set uip_len to the correct
+     value.. */
+
+  if((BUF->len[0] << 8) + BUF->len[1] <= uip_len) {
+    uip_len = (BUF->len[0] << 8) + BUF->len[1];
+#if UIP_CONF_IPV6
+    uip_len += 40; /* The length reported in the IPv6 header is the
+		      length of the payload that follows the
+		      header. However, uIP uses the uip_len variable
+		      for holding the size of the entire packet,
+		      including the IP header. For IPv4 this is not a
+		      problem as the length field in the IPv4 header
+		      contains the length of the entire packet. But
+		      for IPv6 we need to add the size of the IPv6
+		      header (40 bytes). */
+#endif /* UIP_CONF_IPV6 */
+  } else {
+    UIP_LOG("ip: packet shorter than reported in IP header.");
+    goto drop;
+  }
+
+#if !UIP_CONF_IPV6
+  /* Check the fragment flag. */
+  if((BUF->ipoffset[0] & 0x3f) != 0 ||
+     BUF->ipoffset[1] != 0) {
+#if UIP_REASSEMBLY
+    uip_len = uip_reass();
+    if(uip_len == 0) {
+      goto drop;
+    }
+#else /* UIP_REASSEMBLY */
+    UIP_STAT(++uip_stat.ip.drop);
+    UIP_STAT(++uip_stat.ip.fragerr);
+    UIP_LOG("ip: fragment dropped.");
+    goto drop;
+#endif /* UIP_REASSEMBLY */
+  }
+#endif /* UIP_CONF_IPV6 */
+
+  if(uip_ipaddr_cmp(&uip_hostaddr, &uip_all_zeroes_addr)) {
+    /* If we are configured to use ping IP address configuration and
+       hasn't been assigned an IP address yet, we accept all ICMP
+       packets. */
+#if UIP_PINGADDRCONF && !UIP_CONF_IPV6
+    if(BUF->proto == UIP_PROTO_ICMP) {
+      UIP_LOG("ip: possible ping config packet received.");
+      goto icmp_input;
+    } else {
+      UIP_LOG("ip: packet dropped since no address assigned.");
+      goto drop;
+    }
+#endif /* UIP_PINGADDRCONF */
+
+  } else {
+    /* If IP broadcast support is configured, we check for a broadcast
+       UDP packet, which may be destined to us. */
+#if UIP_BROADCAST
+    DEBUG_PRINTF("UDP IP checksum 0x%04x\n", uip_ipchksum());
+    if(BUF->proto == UIP_PROTO_UDP &&
+       uip_ipaddr_cmp(&BUF->destipaddr, &uip_broadcast_addr))
+	{
+		if (uip_ipaddr_cmp(&BUF->srcipaddr, &uip_all_zeroes_addr))
+		  uip_ipaddr_copy(&BUF->srcipaddr, &uip_broadcast_addr);
+
+		goto udp_input;
+    }
+#endif /* UIP_BROADCAST */
+
+    /* Check if the packet is destined for our IP address. */
+#if !UIP_CONF_IPV6
+    if(!uip_ipaddr_cmp(&BUF->destipaddr, &uip_hostaddr)) {
+      UIP_STAT(++uip_stat.ip.drop);
+      goto drop;
+    }
+#else /* UIP_CONF_IPV6 */
+    /* For IPv6, packet reception is a little trickier as we need to
+       make sure that we listen to certain multicast addresses (all
+       hosts multicast address, and the solicited-node multicast
+       address) as well. However, we will cheat here and accept all
+       multicast packets that are sent to the ff02::/16 addresses. */
+    if(!uip_ipaddr_cmp(&BUF->destipaddr, &uip_hostaddr) &&
+       BUF->destipaddr.u16[0] != HTONS(0xff02)) {
+      UIP_STAT(++uip_stat.ip.drop);
+      goto drop;
+    }
+#endif /* UIP_CONF_IPV6 */
+  }
+
+#if !UIP_CONF_IPV6
+  if(uip_ipchksum() != 0xffff) { /* Compute and check the IP header
+				    checksum. */
+    UIP_STAT(++uip_stat.ip.drop);
+    UIP_STAT(++uip_stat.ip.chkerr);
+    UIP_LOG("ip: bad checksum.");
+    goto drop;
+  }
+#endif /* UIP_CONF_IPV6 */
+
+  if(BUF->proto == UIP_PROTO_TCP) { /* Check for TCP packet. If so,
+				       proceed with TCP input
+				       processing. */
+    goto tcp_input;
+  }
+
+#if UIP_UDP
+  if(BUF->proto == UIP_PROTO_UDP) {
+    goto udp_input;
+  }
+#endif /* UIP_UDP */
+
+#if !UIP_CONF_IPV6
+  /* ICMPv4 processing code follows. */
+  if(BUF->proto != UIP_PROTO_ICMP) { /* We only allow ICMP packets from
+					here. */
+    UIP_STAT(++uip_stat.ip.drop);
+    UIP_STAT(++uip_stat.ip.protoerr);
+    UIP_LOG("ip: neither tcp nor icmp.");
+    goto drop;
+  }
+
+#if UIP_PINGADDRCONF
+ icmp_input:
+#endif /* UIP_PINGADDRCONF */
+  UIP_STAT(++uip_stat.icmp.recv);
+
+  /* ICMP echo (i.e., ping) processing. This is simple, we only change
+     the ICMP type from ECHO to ECHO_REPLY and adjust the ICMP
+     checksum before we return the packet. */
+  if(ICMPBUF->type != ICMP_ECHO) {
+    UIP_STAT(++uip_stat.icmp.drop);
+    UIP_STAT(++uip_stat.icmp.typeerr);
+    UIP_LOG("icmp: not icmp echo.");
+    goto drop;
+  }
+
+  /* If we are configured to use ping IP address assignment, we use
+     the destination IP address of this ping packet and assign it to
+     yourself. */
+#if UIP_PINGADDRCONF
+  if(uip_ipaddr_cmp(&uip_hostaddr, &uip_all_zeroes_addr)) {
+    uip_hostaddr = BUF->destipaddr;
+  }
+#endif /* UIP_PINGADDRCONF */
+
+  ICMPBUF->type = ICMP_ECHO_REPLY;
+
+  if(ICMPBUF->icmpchksum >= HTONS(0xffff - (ICMP_ECHO << 8))) {
+    ICMPBUF->icmpchksum += HTONS(ICMP_ECHO << 8) + 1;
+  } else {
+    ICMPBUF->icmpchksum += HTONS(ICMP_ECHO << 8);
+  }
+
+  /* Swap IP addresses. */
+  uip_ipaddr_copy(&BUF->destipaddr, &BUF->srcipaddr);
+  uip_ipaddr_copy(&BUF->srcipaddr, &uip_hostaddr);
+
+  UIP_STAT(++uip_stat.icmp.sent);
+  BUF->ttl = UIP_TTL;
+  goto ip_send_nolen;
+
+  /* End of IPv4 input header processing code. */
+#else /* !UIP_CONF_IPV6 */
+
+  /* This is IPv6 ICMPv6 processing code. */
+  DEBUG_PRINTF("icmp6_input: length %d\n", uip_len);
+
+  if(BUF->proto != UIP_PROTO_ICMP6) { /* We only allow ICMPv6 packets from
+					 here. */
+    UIP_STAT(++uip_stat.ip.drop);
+    UIP_STAT(++uip_stat.ip.protoerr);
+    UIP_LOG("ip: neither tcp nor icmp6.");
+    goto drop;
+  }
+
+  UIP_STAT(++uip_stat.icmp.recv);
+
+  /* If we get a neighbor solicitation for our address we should send
+     a neighbor advertisement message back. */
+  if(ICMPBUF->type == ICMP6_NEIGHBOR_SOLICITATION) {
+    if(uip_ipaddr_cmp(&ICMPBUF->icmp6data, &uip_hostaddr)) {
+
+      if(ICMPBUF->options[0] == ICMP6_OPTION_SOURCE_LINK_ADDRESS) {
+	/* Save the sender's address in our neighbor list. */
+	uip_neighbor_add(&ICMPBUF->srcipaddr, &(ICMPBUF->options[2]));
+      }
+
+      /* We should now send a neighbor advertisement back to where the
+	 neighbor solicitation came from. */
+      ICMPBUF->type = ICMP6_NEIGHBOR_ADVERTISEMENT;
+      ICMPBUF->flags = ICMP6_FLAG_S; /* Solicited flag. */
+
+      ICMPBUF->reserved1 = ICMPBUF->reserved2 = ICMPBUF->reserved3 = 0;
+
+      uip_ipaddr_copy(&ICMPBUF->destipaddr, &ICMPBUF->srcipaddr);
+      uip_ipaddr_copy(&ICMPBUF->srcipaddr, &uip_hostaddr);
+      ICMPBUF->options[0] = ICMP6_OPTION_TARGET_LINK_ADDRESS;
+      ICMPBUF->options[1] = 1;  /* Options length, 1 = 8 bytes. */
+      memcpy(&(ICMPBUF->options[2]), &uip_ethaddr, sizeof(uip_ethaddr));
+      ICMPBUF->icmpchksum = 0;
+      ICMPBUF->icmpchksum = ~uip_icmp6chksum();
+
+      goto send;
+
+    }
+    goto drop;
+  } else if(ICMPBUF->type == ICMP6_ECHO) {
+    /* ICMP echo (i.e., ping) processing. This is simple, we only
+       change the ICMP type from ECHO to ECHO_REPLY and update the
+       ICMP checksum before we return the packet. */
+
+    ICMPBUF->type = ICMP6_ECHO_REPLY;
+
+    uip_ipaddr_copy(&BUF->destipaddr, &BUF->srcipaddr);
+    uip_ipaddr_copy(&BUF->srcipaddr, &uip_hostaddr);
+    ICMPBUF->icmpchksum = 0;
+    ICMPBUF->icmpchksum = ~uip_icmp6chksum();
+
+    UIP_STAT(++uip_stat.icmp.sent);
+    goto send;
+  } else {
+    DEBUG_PRINTF("Unknown icmp6 message type %d\n", ICMPBUF->type);
+    UIP_STAT(++uip_stat.icmp.drop);
+    UIP_STAT(++uip_stat.icmp.typeerr);
+    UIP_LOG("icmp: unknown ICMP message.");
+    goto drop;
+  }
+
+  /* End of IPv6 ICMP processing. */
+
+#endif /* !UIP_CONF_IPV6 */
+
+#if UIP_UDP
+  /* UDP input processing. */
+ udp_input:
+  /* UDP processing is really just a hack. We don't do anything to the
+     UDP/IP headers, but let the UDP application do all the hard
+     work. If the application sets uip_slen, it has a packet to
+     send. */
+#if UIP_UDP_CHECKSUMS
+  uip_len = uip_len - UIP_IPUDPH_LEN;
+  uip_appdata = &uip_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN];
+  if(UDPBUF->udpchksum != 0 && uip_udpchksum() != 0xffff) {
+    UIP_STAT(++uip_stat.udp.drop);
+    UIP_STAT(++uip_stat.udp.chkerr);
+    UIP_LOG("udp: bad checksum.");
+    goto drop;
+  }
+#else /* UIP_UDP_CHECKSUMS */
+  uip_len = uip_len - UIP_IPUDPH_LEN;
+#endif /* UIP_UDP_CHECKSUMS */
+
+  /* Demultiplex this UDP packet between the UDP "connections". */
+  for(uip_udp_conn = &uip_udp_conns[0];
+      uip_udp_conn < &uip_udp_conns[UIP_UDP_CONNS];
+      ++uip_udp_conn) {
+    /* If the local UDP port is non-zero, the connection is considered
+       to be used. If so, the local port number is checked against the
+       destination port number in the received packet. If the two port
+       numbers match, the remote port number is checked if the
+       connection is bound to a remote port. Finally, if the
+       connection is bound to a remote IP address, the source IP
+       address of the packet is checked. */
+    if(uip_udp_conn->lport != 0 &&
+       UDPBUF->destport == uip_udp_conn->lport &&
+       (uip_udp_conn->rport == 0 ||
+        UDPBUF->srcport == uip_udp_conn->rport) &&
+       (uip_ipaddr_cmp(&uip_udp_conn->ripaddr, &uip_all_zeroes_addr) ||
+	uip_ipaddr_cmp(&uip_udp_conn->ripaddr, &uip_broadcast_addr) ||
+	uip_ipaddr_cmp(&BUF->srcipaddr, &uip_udp_conn->ripaddr))) {
+      goto udp_found;
+    }
+  }
+  UIP_LOG("udp: no matching connection found");
+#if UIP_CONF_ICMP_DEST_UNREACH && !UIP_CONF_IPV6
+  /* Copy fields from packet header into payload of this ICMP packet. */
+  memcpy(&(ICMPBUF->payload[0]), ICMPBUF, UIP_IPH_LEN + 8);
+
+  /* Set the ICMP type and code. */
+  ICMPBUF->type = ICMP_DEST_UNREACHABLE;
+  ICMPBUF->icode = ICMP_PORT_UNREACHABLE;
+
+  /* Calculate the ICMP checksum. */
+  ICMPBUF->icmpchksum = 0;
+  ICMPBUF->icmpchksum = ~uip_chksum((u16_t *)&(ICMPBUF->type), 36);
+
+  /* Set the IP destination address to be the source address of the
+     original packet. */
+  uip_ipaddr_copy(&BUF->destipaddr, &BUF->srcipaddr);
+
+  /* Set our IP address as the source address. */
+  uip_ipaddr_copy(&BUF->srcipaddr, &uip_hostaddr);
+
+  /* The size of the ICMP destination unreachable packet is 36 + the
+     size of the IP header (20) = 56. */
+  uip_len = 36 + UIP_IPH_LEN;
+  ICMPBUF->len[0] = 0;
+  ICMPBUF->len[1] = (u8_t)uip_len;
+  ICMPBUF->ttl = UIP_TTL;
+  ICMPBUF->proto = UIP_PROTO_ICMP;
+
+  goto ip_send_nolen;
+#else /* UIP_CONF_ICMP_DEST_UNREACH */
+  goto drop;
+#endif /* UIP_CONF_ICMP_DEST_UNREACH */
+
+ udp_found:
+  uip_conn = NULL;
+  uip_flags = UIP_NEWDATA;
+  uip_sappdata = uip_appdata = &uip_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN];
+  uip_slen = 0;
+  UIP_UDP_APPCALL();
+
+ udp_send:
+  if(uip_slen == 0) {
+    goto drop;
+  }
+  uip_len = uip_slen + UIP_IPUDPH_LEN;
+
+#if UIP_CONF_IPV6
+  /* For IPv6, the IP length field does not include the IPv6 IP header
+     length. */
+  BUF->len[0] = ((uip_len - UIP_IPH_LEN) >> 8);
+  BUF->len[1] = ((uip_len - UIP_IPH_LEN) & 0xff);
+#else /* UIP_CONF_IPV6 */
+  BUF->len[0] = (uip_len >> 8);
+  BUF->len[1] = (uip_len & 0xff);
+#endif /* UIP_CONF_IPV6 */
+
+  BUF->ttl = uip_udp_conn->ttl;
+  BUF->proto = UIP_PROTO_UDP;
+
+  UDPBUF->udplen = HTONS(uip_slen + UIP_UDPH_LEN);
+  UDPBUF->udpchksum = 0;
+
+  BUF->srcport  = uip_udp_conn->lport;
+  BUF->destport = uip_udp_conn->rport;
+
+  uip_ipaddr_copy(&BUF->srcipaddr, &uip_hostaddr);
+  uip_ipaddr_copy(&BUF->destipaddr, &uip_udp_conn->ripaddr);
+
+  uip_appdata = &uip_buf[UIP_LLH_LEN + UIP_IPTCPH_LEN];
+
+#if UIP_UDP_CHECKSUMS
+  /* Calculate UDP checksum. */
+  UDPBUF->udpchksum = ~(uip_udpchksum());
+  if(UDPBUF->udpchksum == 0) {
+    UDPBUF->udpchksum = 0xffff;
+  }
+#endif /* UIP_UDP_CHECKSUMS */
+
+  goto ip_send_nolen;
+#endif /* UIP_UDP */
+
+  /* TCP input processing. */
+ tcp_input:
+  UIP_STAT(++uip_stat.tcp.recv);
+
+  /* Start of TCP input header processing code. */
+
+  if(uip_tcpchksum() != 0xffff) {   /* Compute and check the TCP
+				       checksum. */
+    UIP_STAT(++uip_stat.tcp.drop);
+    UIP_STAT(++uip_stat.tcp.chkerr);
+    UIP_LOG("tcp: bad checksum.");
+    goto drop;
+  }
+
+  /* Demultiplex this segment. */
+  /* First check any active connections. */
+  for(uip_connr = &uip_conns[0]; uip_connr <= &uip_conns[UIP_CONNS - 1];
+      ++uip_connr) {
+    if(uip_connr->tcpstateflags != UIP_CLOSED &&
+       BUF->destport == uip_connr->lport &&
+       BUF->srcport == uip_connr->rport &&
+       uip_ipaddr_cmp(&BUF->srcipaddr, &uip_connr->ripaddr)) {
+      goto found;
+    }
+  }
+
+  /* If we didn't find and active connection that expected the packet,
+     either this packet is an old duplicate, or 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((BUF->flags & TCP_CTL) != TCP_SYN) {
+    goto reset;
+  }
+
+  tmp16 = BUF->destport;
+  /* Next, check listening connections. */
+  for(c = 0; c < UIP_LISTENPORTS; ++c) {
+    if(tmp16 == uip_listenports[c]) {
+      goto found_listen;
+    }
+  }
+
+  /* No matching connection found, so we send a RST packet. */
+  UIP_STAT(++uip_stat.tcp.synrst);
+
+ reset:
+  /* We do not send resets in response to resets. */
+  if(BUF->flags & TCP_RST) {
+    goto drop;
+  }
+
+  UIP_STAT(++uip_stat.tcp.rst);
+
+  BUF->flags = TCP_RST | TCP_ACK;
+  uip_len = UIP_IPTCPH_LEN;
+  BUF->tcpoffset = 5 << 4;
+
+  /* Flip the seqno and ackno fields in the TCP header. */
+  c = BUF->seqno[3];
+  BUF->seqno[3] = BUF->ackno[3];
+  BUF->ackno[3] = c;
+
+  c = BUF->seqno[2];
+  BUF->seqno[2] = BUF->ackno[2];
+  BUF->ackno[2] = c;
+
+  c = BUF->seqno[1];
+  BUF->seqno[1] = BUF->ackno[1];
+  BUF->ackno[1] = c;
+
+  c = BUF->seqno[0];
+  BUF->seqno[0] = BUF->ackno[0];
+  BUF->ackno[0] = c;
+
+  /* We also have to increase the sequence number we are
+     acknowledging. If the least significant byte overflowed, we need
+     to propagate the carry to the other bytes as well. */
+  if(++BUF->ackno[3] == 0) {
+    if(++BUF->ackno[2] == 0) {
+      if(++BUF->ackno[1] == 0) {
+	++BUF->ackno[0];
+      }
+    }
+  }
+
+  /* Swap port numbers. */
+  tmp16 = BUF->srcport;
+  BUF->srcport = BUF->destport;
+  BUF->destport = tmp16;
+
+  /* Swap IP addresses. */
+  uip_ipaddr_copy(&BUF->destipaddr, &BUF->srcipaddr);
+  uip_ipaddr_copy(&BUF->srcipaddr, &uip_hostaddr);
+
+  /* And send out the RST packet! */
+  goto tcp_send_noconn;
+
+  /* This label will be jumped to if we matched the incoming packet
+     with a connection in LISTEN. In that case, we should create a new
+     connection and send a SYNACK in return. */
+ found_listen:
+  /* First we check if there are any connections available. Unused
+     connections are kept in the same table as used connections, but
+     unused ones have the tcpstate set to CLOSED. Also, connections in
+     TIME_WAIT are kept track of and we'll use the oldest one if no
+     CLOSED connections are found. Thanks to Eddie C. Dost for a very
+     nice algorithm for the TIME_WAIT search. */
+  uip_connr = 0;
+  for(c = 0; c < UIP_CONNS; ++c) {
+    if(uip_conns[c].tcpstateflags == UIP_CLOSED) {
+      uip_connr = &uip_conns[c];
+      break;
+    }
+    if(uip_conns[c].tcpstateflags == UIP_TIME_WAIT) {
+      if(uip_connr == 0 ||
+	 uip_conns[c].timer > uip_connr->timer) {
+	uip_connr = &uip_conns[c];
+      }
+    }
+  }
+
+  if(uip_connr == 0) {
+    /* All connections are used already, we drop packet and hope that
+       the remote end will retransmit the packet at a time when we
+       have more spare connections. */
+    UIP_STAT(++uip_stat.tcp.syndrop);
+    UIP_LOG("tcp: found no unused connections.");
+    goto drop;
+  }
+  uip_conn = uip_connr;
+
+  /* Fill in the necessary fields for the new connection. */
+  uip_connr->rto = uip_connr->timer = UIP_RTO;
+  uip_connr->sa = 0;
+  uip_connr->sv = 4;
+  uip_connr->nrtx = 0;
+  uip_connr->lport = BUF->destport;
+  uip_connr->rport = BUF->srcport;
+  uip_ipaddr_copy(&uip_connr->ripaddr, &BUF->srcipaddr);
+  uip_connr->tcpstateflags = UIP_SYN_RCVD;
+
+  uip_connr->snd_nxt[0] = iss[0];
+  uip_connr->snd_nxt[1] = iss[1];
+  uip_connr->snd_nxt[2] = iss[2];
+  uip_connr->snd_nxt[3] = iss[3];
+  uip_connr->len = 1;
+
+  /* rcv_nxt should be the seqno from the incoming packet + 1. */
+  uip_connr->rcv_nxt[3] = BUF->seqno[3];
+  uip_connr->rcv_nxt[2] = BUF->seqno[2];
+  uip_connr->rcv_nxt[1] = BUF->seqno[1];
+  uip_connr->rcv_nxt[0] = BUF->seqno[0];
+  uip_add_rcv_nxt(1);
+
+  /* Parse the TCP MSS option, if present. */
+  if((BUF->tcpoffset & 0xf0) > 0x50) {
+    for(c = 0; c < ((BUF->tcpoffset >> 4) - 5) << 2 ;) {
+      opt = uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + c];
+      if(opt == TCP_OPT_END) {
+	/* End of options. */
+	break;
+      } else if(opt == TCP_OPT_NOOP) {
+	++c;
+	/* NOP option. */
+      } else if(opt == TCP_OPT_MSS &&
+		uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + c] == TCP_OPT_MSS_LEN) {
+	/* An MSS option with the right option length. */
+	tmp16 = ((u16_t)uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 2 + c] << 8) |
+	  (u16_t)uip_buf[UIP_IPTCPH_LEN + UIP_LLH_LEN + 3 + c];
+	uip_connr->initialmss = uip_connr->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(uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + c] == 0) {
+	  /* If the length field is zero, the options are malformed
+	     and we don't process them further. */
+	  break;
+	}
+	c += uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + c];
+      }
+    }
+  }
+
+  /* Our response will be a SYNACK. */
+#if UIP_ACTIVE_OPEN
+ tcp_send_synack:
+  BUF->flags = TCP_ACK;
+
+ tcp_send_syn:
+  BUF->flags |= TCP_SYN;
+#else /* UIP_ACTIVE_OPEN */
+ tcp_send_synack:
+  BUF->flags = TCP_SYN | TCP_ACK;
+#endif /* UIP_ACTIVE_OPEN */
+
+  /* We send out the TCP Maximum Segment Size option with our
+     SYNACK. */
+  BUF->optdata[0] = TCP_OPT_MSS;
+  BUF->optdata[1] = TCP_OPT_MSS_LEN;
+  BUF->optdata[2] = (UIP_TCP_MSS) / 256;
+  BUF->optdata[3] = (UIP_TCP_MSS) & 255;
+  uip_len = UIP_IPTCPH_LEN + TCP_OPT_MSS_LEN;
+  BUF->tcpoffset = ((UIP_TCPH_LEN + TCP_OPT_MSS_LEN) / 4) << 4;
+  goto tcp_send;
+
+  /* This label will be jumped to if we found an active connection. */
+ found:
+  uip_conn = uip_connr;
+  uip_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(BUF->flags & TCP_RST) {
+    uip_connr->tcpstateflags = UIP_CLOSED;
+    UIP_LOG("tcp: got reset, aborting connection.");
+    uip_flags = UIP_ABORT;
+    UIP_APPCALL();
+    goto drop;
+  }
+  /* Calculate the length of the data, if the application has sent
+     any data to us. */
+  c = (BUF->tcpoffset >> 4) << 2;
+  /* uip_len will contain the length of the actual TCP data. This is
+     calculated by subtracing the length of the TCP header (in
+     c) and the length of the IP header (20 bytes). */
+  uip_len = uip_len - c - 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. */
+  if(!(((uip_connr->tcpstateflags & UIP_TS_MASK) == UIP_SYN_SENT) &&
+       ((BUF->flags & TCP_CTL) == (TCP_SYN | TCP_ACK)))) {
+    if((uip_len > 0 || ((BUF->flags & (TCP_SYN | TCP_FIN)) != 0)) &&
+       (BUF->seqno[0] != uip_connr->rcv_nxt[0] ||
+	BUF->seqno[1] != uip_connr->rcv_nxt[1] ||
+	BUF->seqno[2] != uip_connr->rcv_nxt[2] ||
+	BUF->seqno[3] != uip_connr->rcv_nxt[3])) {
+      goto tcp_send_ack;
+    }
+  }
+
+  /* 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((BUF->flags & TCP_ACK) && uip_outstanding(uip_connr)) {
+    uip_add32(uip_connr->snd_nxt, uip_connr->len);
+
+    if(BUF->ackno[0] == uip_acc32[0] &&
+       BUF->ackno[1] == uip_acc32[1] &&
+       BUF->ackno[2] == uip_acc32[2] &&
+       BUF->ackno[3] == uip_acc32[3]) {
+      /* Update sequence number. */
+      uip_connr->snd_nxt[0] = uip_acc32[0];
+      uip_connr->snd_nxt[1] = uip_acc32[1];
+      uip_connr->snd_nxt[2] = uip_acc32[2];
+      uip_connr->snd_nxt[3] = uip_acc32[3];
+
+      /* Do RTT estimation, unless we have done retransmissions. */
+      if(uip_connr->nrtx == 0) {
+	signed char m;
+	m = uip_connr->rto - uip_connr->timer;
+	/* This is taken directly from VJs original code in his paper */
+	m = m - (uip_connr->sa >> 3);
+	uip_connr->sa += m;
+	if(m < 0) {
+	  m = -m;
+	}
+	m = m - (uip_connr->sv >> 2);
+	uip_connr->sv += m;
+	uip_connr->rto = (uip_connr->sa >> 3) + uip_connr->sv;
+
+      }
+      /* Set the acknowledged flag. */
+      uip_flags = UIP_ACKDATA;
+      /* Reset the retransmission timer. */
+      uip_connr->timer = uip_connr->rto;
+
+      /* Reset length of outstanding data. */
+      uip_connr->len = 0;
+    }
+
+  }
+
+  /* Do different things depending on in what state the connection is. */
+  switch(uip_connr->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(uip_flags & UIP_ACKDATA) {
+      uip_connr->tcpstateflags = UIP_ESTABLISHED;
+      uip_flags = UIP_CONNECTED;
+      uip_connr->len = 0;
+      if(uip_len > 0) {
+        uip_flags |= UIP_NEWDATA;
+        uip_add_rcv_nxt(uip_len);
+      }
+      uip_slen = 0;
+      UIP_APPCALL();
+      goto appsend;
+    }
+    goto drop;
+#if UIP_ACTIVE_OPEN
+  case UIP_SYN_SENT:
+    /* In SYN_SENT, we wait for a SYNACK that is sent in response to
+       our SYN. The rcv_nxt is set to sequence number in the SYNACK
+       plus one, and we send an ACK. We move into the ESTABLISHED
+       state. */
+    if((uip_flags & UIP_ACKDATA) &&
+       (BUF->flags & TCP_CTL) == (TCP_SYN | TCP_ACK)) {
+
+      /* Parse the TCP MSS option, if present. */
+      if((BUF->tcpoffset & 0xf0) > 0x50) {
+	for(c = 0; c < ((BUF->tcpoffset >> 4) - 5) << 2 ;) {
+	  opt = uip_buf[UIP_IPTCPH_LEN + UIP_LLH_LEN + c];
+	  if(opt == TCP_OPT_END) {
+	    /* End of options. */
+	    break;
+	  } else if(opt == TCP_OPT_NOOP) {
+	    ++c;
+	    /* NOP option. */
+	  } else if(opt == TCP_OPT_MSS &&
+		    uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + c] == TCP_OPT_MSS_LEN) {
+	    /* An MSS option with the right option length. */
+	    tmp16 = (uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 2 + c] << 8) |
+	      uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 3 + c];
+	    uip_connr->initialmss =
+	      uip_connr->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(uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + c] == 0) {
+	      /* If the length field is zero, the options are malformed
+		 and we don't process them further. */
+	      break;
+	    }
+	    c += uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + c];
+	  }
+	}
+      }
+      uip_connr->tcpstateflags = UIP_ESTABLISHED;
+      uip_connr->rcv_nxt[0] = BUF->seqno[0];
+      uip_connr->rcv_nxt[1] = BUF->seqno[1];
+      uip_connr->rcv_nxt[2] = BUF->seqno[2];
+      uip_connr->rcv_nxt[3] = BUF->seqno[3];
+      uip_add_rcv_nxt(1);
+      uip_flags = UIP_CONNECTED | UIP_NEWDATA;
+      uip_connr->len = 0;
+      uip_len = 0;
+      uip_slen = 0;
+      UIP_APPCALL();
+      goto appsend;
+    }
+    /* Inform the application that the connection failed */
+    uip_flags = UIP_ABORT;
+    UIP_APPCALL();
+    /* The connection is closed after we send the RST */
+    uip_conn->tcpstateflags = UIP_CLOSED;
+    goto reset;
+#endif /* UIP_ACTIVE_OPEN */
+
+  case UIP_ESTABLISHED:
+    /* In the ESTABLISHED state, we call upon the application to feed
+    data into the uip_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(BUF->flags & TCP_FIN && !(uip_connr->tcpstateflags & UIP_STOPPED)) {
+      if(uip_outstanding(uip_connr)) {
+	goto drop;
+      }
+      uip_add_rcv_nxt(1 + uip_len);
+      uip_flags |= UIP_CLOSE;
+      if(uip_len > 0) {
+	uip_flags |= UIP_NEWDATA;
+      }
+      UIP_APPCALL();
+      uip_connr->len = 1;
+      uip_connr->tcpstateflags = UIP_LAST_ACK;
+      uip_connr->nrtx = 0;
+    tcp_send_finack:
+      BUF->flags = TCP_FIN | TCP_ACK;
+      goto tcp_send_nodata;
+    }
+
+    /* Check the URG flag. If this is set, the segment carries urgent
+       data that we must pass to the application. */
+    if((BUF->flags & TCP_URG) != 0) {
+#if UIP_URGDATA > 0
+      uip_urglen = (BUF->urgp[0] << 8) | BUF->urgp[1];
+      if(uip_urglen > uip_len) {
+	/* There is more urgent data in the next segment to come. */
+	uip_urglen = uip_len;
+      }
+      uip_add_rcv_nxt(uip_urglen);
+      uip_len -= uip_urglen;
+      uip_urgdata = uip_appdata;
+      uip_appdata += uip_urglen;
+    } else {
+      uip_urglen = 0;
+#else /* UIP_URGDATA > 0 */
+      uip_appdata = ((char *)uip_appdata) + ((BUF->urgp[0] << 8) | BUF->urgp[1]);
+      uip_len -= (BUF->urgp[0] << 8) | BUF->urgp[1];
+#endif /* UIP_URGDATA > 0 */
+    }
+
+    /* If uip_len > 0 we have TCP data in the packet, and we flag this
+       by setting the UIP_NEWDATA flag and update the sequence number
+       we acknowledge. If the application has stopped the dataflow
+       using uip_stop(), we must not accept any data packets from the
+       remote host. */
+    if(uip_len > 0 && !(uip_connr->tcpstateflags & UIP_STOPPED)) {
+      uip_flags |= UIP_NEWDATA;
+      uip_add_rcv_nxt(uip_len);
+    }
+
+    /* 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 mechanism.
+    */
+    tmp16 = ((u16_t)BUF->wnd[0] << 8) + (u16_t)BUF->wnd[1];
+    if(tmp16 > uip_connr->initialmss ||
+       tmp16 == 0) {
+      tmp16 = uip_connr->initialmss;
+    }
+    uip_connr->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 global variable uip_len
+       contains the length of the incoming data. The application can
+       access the incoming data through the global pointer
+       uip_appdata, which usually points UIP_IPTCPH_LEN + UIP_LLH_LEN
+       bytes into the uip_buf array.
+
+       If the application wishes to send any data, this data should be
+       put into the uip_appdata and the length of the data should be
+       put into uip_len. If the application don't have any data to
+       send, uip_len must be set to 0. */
+    if(uip_flags & (UIP_NEWDATA | UIP_ACKDATA)) {
+      uip_slen = 0;
+      UIP_APPCALL();
+
+    appsend:
+
+      if(uip_flags & UIP_ABORT) {
+	uip_slen = 0;
+	uip_connr->tcpstateflags = UIP_CLOSED;
+	BUF->flags = TCP_RST | TCP_ACK;
+	goto tcp_send_nodata;
+      }
+
+      if(uip_flags & UIP_CLOSE) {
+	uip_slen = 0;
+	uip_connr->len = 1;
+	uip_connr->tcpstateflags = UIP_FIN_WAIT_1;
+	uip_connr->nrtx = 0;
+	BUF->flags = TCP_FIN | TCP_ACK;
+	goto tcp_send_nodata;
+      }
+
+      /* If uip_slen > 0, the application has data to be sent. */
+      if(uip_slen > 0) {
+
+	/* If the connection has acknowledged data, the contents of
+	   the ->len variable should be discarded. */
+	if((uip_flags & UIP_ACKDATA) != 0) {
+	  uip_connr->len = 0;
+	}
+
+	/* If the ->len variable is non-zero the connection has
+	   already data in transit and cannot send anymore right
+	   now. */
+	if(uip_connr->len == 0) {
+
+	  /* The application cannot send more than what is allowed by
+	     the mss (the minumum of the MSS and the available
+	     window). */
+	  if(uip_slen > uip_connr->mss) {
+	    uip_slen = uip_connr->mss;
+	  }
+
+	  /* Remember how much data we send out now so that we know
+	     when everything has been acknowledged. */
+	  uip_connr->len = uip_slen;
+	} else {
+
+	  /* If the application already had unacknowledged data, we
+	     make sure that the application does not send (i.e.,
+	     retransmit) out more than it previously sent out. */
+	  uip_slen = uip_connr->len;
+	}
+      }
+      uip_connr->nrtx = 0;
+    apprexmit:
+      uip_appdata = uip_sappdata;
+
+      /* If the application has data to be sent, or if the incoming
+         packet had new data in it, we must send out a packet. */
+      if(uip_slen > 0 && uip_connr->len > 0) {
+	/* Add the length of the IP and TCP headers. */
+	uip_len = uip_connr->len + UIP_TCPIP_HLEN;
+	/* We always set the ACK flag in response packets. */
+	BUF->flags = TCP_ACK | TCP_PSH;
+	/* Send the packet. */
+	goto tcp_send_noopts;
+      }
+      /* If there is no data to send, just send out a pure ACK if
+	 there is newdata. */
+      if(uip_flags & UIP_NEWDATA) {
+	uip_len = UIP_TCPIP_HLEN;
+	BUF->flags = TCP_ACK;
+	goto tcp_send_noopts;
+      }
+    }
+    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(uip_flags & UIP_ACKDATA) {
+      uip_connr->tcpstateflags = UIP_CLOSED;
+      uip_flags = UIP_CLOSE;
+      UIP_APPCALL();
+    }
+    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(uip_len > 0) {
+      uip_add_rcv_nxt(uip_len);
+    }
+    if(BUF->flags & TCP_FIN) {
+      if(uip_flags & UIP_ACKDATA) {
+	uip_connr->tcpstateflags = UIP_TIME_WAIT;
+	uip_connr->timer = 0;
+	uip_connr->len = 0;
+      } else {
+	uip_connr->tcpstateflags = UIP_CLOSING;
+      }
+      uip_add_rcv_nxt(1);
+      uip_flags = UIP_CLOSE;
+      UIP_APPCALL();
+      goto tcp_send_ack;
+    } else if(uip_flags & UIP_ACKDATA) {
+      uip_connr->tcpstateflags = UIP_FIN_WAIT_2;
+      uip_connr->len = 0;
+      goto drop;
+    }
+    if(uip_len > 0) {
+      goto tcp_send_ack;
+    }
+    goto drop;
+
+  case UIP_FIN_WAIT_2:
+    if(uip_len > 0) {
+      uip_add_rcv_nxt(uip_len);
+    }
+    if(BUF->flags & TCP_FIN) {
+      uip_connr->tcpstateflags = UIP_TIME_WAIT;
+      uip_connr->timer = 0;
+      uip_add_rcv_nxt(1);
+      uip_flags = UIP_CLOSE;
+      UIP_APPCALL();
+      goto tcp_send_ack;
+    }
+    if(uip_len > 0) {
+      goto tcp_send_ack;
+    }
+    goto drop;
+
+  case UIP_TIME_WAIT:
+    goto tcp_send_ack;
+
+  case UIP_CLOSING:
+    if(uip_flags & UIP_ACKDATA) {
+      uip_connr->tcpstateflags = UIP_TIME_WAIT;
+      uip_connr->timer = 0;
+    }
+  }
+  goto drop;
+
+  /* We jump here when we are ready to send the packet, and just want
+     to set the appropriate TCP sequence numbers in the TCP header. */
+ tcp_send_ack:
+  BUF->flags = TCP_ACK;
+
+ tcp_send_nodata:
+  uip_len = UIP_IPTCPH_LEN;
+
+ tcp_send_noopts:
+  BUF->tcpoffset = (UIP_TCPH_LEN / 4) << 4;
+
+  /* We're done with the input processing. We are now ready to send a
+     reply. Our job is to fill in all the fields of the TCP and IP
+     headers before calculating the checksum and finally send the
+     packet. */
+ tcp_send:
+  BUF->ackno[0] = uip_connr->rcv_nxt[0];
+  BUF->ackno[1] = uip_connr->rcv_nxt[1];
+  BUF->ackno[2] = uip_connr->rcv_nxt[2];
+  BUF->ackno[3] = uip_connr->rcv_nxt[3];
+
+  BUF->seqno[0] = uip_connr->snd_nxt[0];
+  BUF->seqno[1] = uip_connr->snd_nxt[1];
+  BUF->seqno[2] = uip_connr->snd_nxt[2];
+  BUF->seqno[3] = uip_connr->snd_nxt[3];
+
+  BUF->proto = UIP_PROTO_TCP;
+
+  BUF->srcport  = uip_connr->lport;
+  BUF->destport = uip_connr->rport;
+
+  uip_ipaddr_copy(&BUF->srcipaddr, &uip_hostaddr);
+  uip_ipaddr_copy(&BUF->destipaddr, &uip_connr->ripaddr);
+
+  if(uip_connr->tcpstateflags & UIP_STOPPED) {
+    /* If the connection has issued uip_stop(), we advertise a zero
+       window so that the remote host will stop sending data. */
+    BUF->wnd[0] = BUF->wnd[1] = 0;
+  } else {
+    BUF->wnd[0] = ((UIP_RECEIVE_WINDOW) >> 8);
+    BUF->wnd[1] = ((UIP_RECEIVE_WINDOW) & 0xff);
+  }
+
+ tcp_send_noconn:
+  BUF->ttl = UIP_TTL;
+#if UIP_CONF_IPV6
+  /* For IPv6, the IP length field does not include the IPv6 IP header
+     length. */
+  BUF->len[0] = ((uip_len - UIP_IPH_LEN) >> 8);
+  BUF->len[1] = ((uip_len - UIP_IPH_LEN) & 0xff);
+#else /* UIP_CONF_IPV6 */
+  BUF->len[0] = (uip_len >> 8);
+  BUF->len[1] = (uip_len & 0xff);
+#endif /* UIP_CONF_IPV6 */
+
+  BUF->urgp[0] = BUF->urgp[1] = 0;
+
+  /* Calculate TCP checksum. */
+  BUF->tcpchksum = 0;
+  BUF->tcpchksum = ~(uip_tcpchksum());
+
+ ip_send_nolen:
+#if UIP_CONF_IPV6
+  BUF->vtc = 0x60;
+  BUF->tcflow = 0x00;
+  BUF->flow = 0x00;
+#else /* UIP_CONF_IPV6 */
+  BUF->vhl = 0x45;
+  BUF->tos = 0;
+  BUF->ipoffset[0] = BUF->ipoffset[1] = 0;
+  ++ipid;
+  BUF->ipid[0] = ipid >> 8;
+  BUF->ipid[1] = ipid & 0xff;
+  /* Calculate IP checksum. */
+  BUF->ipchksum = 0;
+  BUF->ipchksum = ~(uip_ipchksum());
+  DEBUG_PRINTF("uip ip_send_nolen: checksum 0x%04x\n", uip_ipchksum());
+#endif /* UIP_CONF_IPV6 */
+  UIP_STAT(++uip_stat.tcp.sent);
+#if UIP_CONF_IPV6
+ send:
+#endif /* UIP_CONF_IPV6 */
+  DEBUG_PRINTF("Sending packet with length %d (%d)\n", uip_len,
+	       (BUF->len[0] << 8) | BUF->len[1]);
+
+  UIP_STAT(++uip_stat.ip.sent);
+  /* Return and let the caller do the actual transmission. */
+  uip_flags = 0;
+  return;
+
+ drop:
+  uip_len = 0;
+  uip_flags = 0;
+  return;
+}
+/*---------------------------------------------------------------------------*/
+u16_t
+htons(u16_t val)
+{
+  return HTONS(val);
+}
+
+u32_t
+htonl(u32_t val)
+{
+  return HTONL(val);
+}
+/*---------------------------------------------------------------------------*/
+void
+uip_send(const void *data, int len)
+{
+  int copylen;
+#define MIN(a,b) ((a) < (b)? (a): (b))
+  copylen = MIN(len, UIP_BUFSIZE - UIP_LLH_LEN - UIP_TCPIP_HLEN -
+		(int)((char *)uip_sappdata - (char *)&uip_buf[UIP_LLH_LEN + UIP_TCPIP_HLEN]));
+  if(copylen > 0) {
+    uip_slen = copylen;
+    if(data != uip_sappdata) {
+      memcpy(uip_sappdata, (data), uip_slen);
+    }
+  }
+}
+/*---------------------------------------------------------------------------*/
+/** @} */
+#endif /* UIP_CONF_IPV6 */
+
diff --git a/lib/lufa/Projects/Webserver/Lib/uip/uip.h b/lib/lufa/Projects/Webserver/Lib/uip/uip.h
new file mode 100644
index 0000000000..7b87a2c77c
--- /dev/null
+++ b/lib/lufa/Projects/Webserver/Lib/uip/uip.h
@@ -0,0 +1,2130 @@
+
+/**
+ * \addtogroup uip
+ * @{
+ */
+
+/**
+ * \file
+ * Header file for the uIP TCP/IP stack.
+ * \author  Adam Dunkels <adam@dunkels.com>
+ * \author  Julien Abeille <jabeille@cisco.com> (IPv6 related code)
+ * \author  Mathilde Durvy <mdurvy@cisco.com> (IPv6 related code)
+ *
+ * The uIP TCP/IP stack header file contains definitions for a number
+ * of C macros that are used by uIP programs as well as internal uIP
+ * structures, TCP/IP header structures and function declarations.
+ *
+ */
+
+/*
+ * Copyright (c) 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.
+ *
+ * This file is part of the uIP TCP/IP stack.
+ *
+ * $Id: uip.h,v 1.24 2009/04/06 13:18:50 nvt-se Exp $
+ *
+ */
+
+#ifndef __UIP_H__
+#define __UIP_H__
+
+#include "uipopt.h"
+
+/**
+ * Representation of an IP address.
+ *
+ */
+#if UIP_CONF_IPV6
+typedef union uip_ip6addr_t {
+  u8_t  u8[16];			/* Initialiser, must come first!!! */
+  u16_t u16[8];
+} uip_ip6addr_t;
+
+typedef uip_ip6addr_t uip_ipaddr_t;
+#else /* UIP_CONF_IPV6 */
+typedef union uip_ip4addr_t {
+  u8_t  u8[4];			/* Initialiser, must come first!!! */
+  u16_t u16[2];
+#if 0
+  u32_t u32;
+#endif
+} uip_ip4addr_t;
+typedef uip_ip4addr_t uip_ipaddr_t;
+#endif /* UIP_CONF_IPV6 */
+
+
+/*---------------------------------------------------------------------------*/
+
+/** \brief 16 bit 802.15.4 address */
+struct uip_802154_shortaddr {
+  u8_t addr[2];
+};
+/** \brief 64 bit 802.15.4 address */
+struct uip_802154_longaddr {
+  u8_t addr[8];
+};
+
+/** \brief 802.11 address */
+struct uip_80211_addr {
+  u8_t addr[6];
+};
+
+/** \brief 802.3 address */
+struct uip_eth_addr {
+  u8_t addr[6];
+};
+
+#if UIP_CONF_LL_802154
+/** \brief 802.15.4 address */
+typedef struct uip_802154_longaddr uip_lladdr_t;
+#define UIP_802154_SHORTADDR_LEN 2
+#define UIP_802154_LONGADDR_LEN  8
+#define UIP_LLADDR_LEN UIP_802154_LONGADDR_LEN
+#else /*UIP_CONF_LL_802154*/
+#if UIP_CONF_LL_80211
+/** \brief 802.11 address */
+typedef struct uip_80211_addr uip_lladdr_t;
+#define UIP_LLADDR_LEN 6
+#else /*UIP_CONF_LL_80211*/
+/** \brief Ethernet address */
+typedef struct uip_eth_addr uip_lladdr_t;
+#define UIP_LLADDR_LEN 6
+#endif /*UIP_CONF_LL_80211*/
+#endif /*UIP_CONF_LL_802154*/
+
+/*---------------------------------------------------------------------------*/
+/* First, the functions that should be called from the
+ * system. Initialization, the periodic timer, and incoming packets are
+ * handled by the following three functions.
+ */
+/**
+ * \defgroup uipconffunc uIP configuration functions
+ * @{
+ *
+ * The uIP configuration functions are used for setting run-time
+ * parameters in uIP such as IP addresses.
+ */
+
+/**
+ * Set the IP address of this host.
+ *
+ * The IP address is represented as a 4-byte array where the first
+ * octet of the IP address is put in the first member of the 4-byte
+ * array.
+ *
+ * Example:
+ \code
+
+ uip_ipaddr_t addr;
+
+ uip_ipaddr(&addr, 192,168,1,2);
+ uip_sethostaddr(&addr);
+
+ \endcode
+ * \param addr A pointer to an IP address of type uip_ipaddr_t;
+ *
+ * \sa uip_ipaddr()
+ *
+ * \hideinitializer
+ */
+#define uip_sethostaddr(addr) uip_ipaddr_copy(&uip_hostaddr, (addr))
+
+/**
+ * Get the IP address of this host.
+ *
+ * The IP address is represented as a 4-byte array where the first
+ * octet of the IP address is put in the first member of the 4-byte
+ * array.
+ *
+ * Example:
+ \code
+ uip_ipaddr_t hostaddr;
+
+ uip_gethostaddr(&hostaddr);
+ \endcode
+ * \param addr A pointer to a uip_ipaddr_t variable that will be
+ * filled in with the currently configured IP address.
+ *
+ * \hideinitializer
+ */
+#define uip_gethostaddr(addr) uip_ipaddr_copy((addr), &uip_hostaddr)
+
+/**
+ * Set the default router's IP address.
+ *
+ * \param addr A pointer to a uip_ipaddr_t variable containing the IP
+ * address of the default router.
+ *
+ * \sa uip_ipaddr()
+ *
+ * \hideinitializer
+ */
+#define uip_setdraddr(addr) uip_ipaddr_copy(&uip_draddr, (addr))
+
+/**
+ * Set the netmask.
+ *
+ * \param addr A pointer to a uip_ipaddr_t variable containing the IP
+ * address of the netmask.
+ *
+ * \sa uip_ipaddr()
+ *
+ * \hideinitializer
+ */
+#define uip_setnetmask(addr) uip_ipaddr_copy(&uip_netmask, (addr))
+
+
+/**
+ * Get the default router's IP address.
+ *
+ * \param addr A pointer to a uip_ipaddr_t variable that will be
+ * filled in with the IP address of the default router.
+ *
+ * \hideinitializer
+ */
+#define uip_getdraddr(addr) uip_ipaddr_copy((addr), &uip_draddr)
+
+/**
+ * Get the netmask.
+ *
+ * \param addr A pointer to a uip_ipaddr_t variable that will be
+ * filled in with the value of the netmask.
+ *
+ * \hideinitializer
+ */
+#define uip_getnetmask(addr) uip_ipaddr_copy((addr), &uip_netmask)
+
+/** @} */
+
+/**
+ * \defgroup uipinit uIP initialization functions
+ * @{
+ *
+ * The uIP initialization functions are used for booting uIP.
+ */
+
+/**
+ * uIP initialization function.
+ *
+ * This function should be called at boot up to initialize the uIP
+ * TCP/IP stack.
+ */
+void uip_init(void);
+
+/**
+ * uIP initialization function.
+ *
+ * This function may be used at boot time to set the initial ip_id.
+ */
+void uip_setipid(u16_t id);
+
+/** @} */
+
+/**
+ * \defgroup uipdevfunc uIP device driver functions
+ * @{
+ *
+ * These functions are used by a network device driver for interacting
+ * with uIP.
+ */
+
+/**
+ * Process an incoming packet.
+ *
+ * This function should be called when the device driver has received
+ * a packet from the network. The packet from the device driver must
+ * be present in the uip_buf buffer, and the length of the packet
+ * should be placed in the uip_len variable.
+ *
+ * When the function returns, there may be an outbound packet placed
+ * in the uip_buf packet buffer. If so, the uip_len variable is set to
+ * the length of the packet. If no packet is to be sent out, the
+ * uip_len variable is set to 0.
+ *
+ * The usual way of calling the function is presented by the source
+ * code below.
+ \code
+ uip_len = devicedriver_poll();
+ if(uip_len > 0) {
+ uip_input();
+ if(uip_len > 0) {
+ devicedriver_send();
+ }
+ }
+ \endcode
+ *
+ * \note If you are writing a uIP device driver that needs ARP
+ * (Address Resolution Protocol), e.g., when running uIP over
+ * Ethernet, you will need to call the uIP ARP code before calling
+ * this function:
+ \code
+ #define BUF ((struct uip_eth_hdr *)&uip_buf[0])
+ uip_len = ethernet_devicedrver_poll();
+ if(uip_len > 0) {
+ if(BUF->type == HTONS(UIP_ETHTYPE_IP)) {
+ uip_arp_ipin();
+ uip_input();
+ if(uip_len > 0) {
+ uip_arp_out();
+ ethernet_devicedriver_send();
+ }
+ } else if(BUF->type == HTONS(UIP_ETHTYPE_ARP)) {
+ uip_arp_arpin();
+ if(uip_len > 0) {
+ ethernet_devicedriver_send();
+ }
+ }
+ \endcode
+ *
+ * \hideinitializer
+ */
+#define uip_input()        uip_process(UIP_DATA)
+
+
+/**
+ * Periodic processing for a connection identified by its number.
+ *
+ * This function does the necessary periodic processing (timers,
+ * polling) for a uIP TCP connection, and should be called when the
+ * periodic uIP timer goes off. It should be called for every
+ * connection, regardless of whether they are open of closed.
+ *
+ * When the function returns, it may have an outbound packet waiting
+ * for service in the uIP packet buffer, and if so the uip_len
+ * variable is set to a value larger than zero. The device driver
+ * should be called to send out the packet.
+ *
+ * The usual way of calling the function is through a for() loop like
+ * this:
+ \code
+ for(i = 0; i < UIP_CONNS; ++i) {
+ uip_periodic(i);
+ if(uip_len > 0) {
+ devicedriver_send();
+ }
+ }
+ \endcode
+ *
+ * \note If you are writing a uIP device driver that needs ARP
+ * (Address Resolution Protocol), e.g., when running uIP over
+ * Ethernet, you will need to call the uip_arp_out() function before
+ * calling the device driver:
+ \code
+ for(i = 0; i < UIP_CONNS; ++i) {
+ uip_periodic(i);
+ if(uip_len > 0) {
+ uip_arp_out();
+ ethernet_devicedriver_send();
+ }
+ }
+ \endcode
+ *
+ * \param conn The number of the connection which is to be periodically polled.
+ *
+ * \hideinitializer
+ */
+#if UIP_TCP
+#define uip_periodic(conn) do { uip_conn = &uip_conns[conn];    \
+    uip_process(UIP_TIMER); } while (0)
+
+/**
+ *
+ *
+ */
+#define uip_conn_active(conn) (uip_conns[conn].tcpstateflags != UIP_CLOSED)
+
+/**
+ * Perform periodic processing for a connection identified by a pointer
+ * to its structure.
+ *
+ * Same as uip_periodic() but takes a pointer to the actual uip_conn
+ * struct instead of an integer as its argument. This function can be
+ * used to force periodic processing of a specific connection.
+ *
+ * \param conn A pointer to the uip_conn struct for the connection to
+ * be processed.
+ *
+ * \hideinitializer
+ */
+#define uip_periodic_conn(conn) do { uip_conn = conn;   \
+    uip_process(UIP_TIMER); } while (0)
+
+/**
+ * Request that a particular connection should be polled.
+ *
+ * Similar to uip_periodic_conn() but does not perform any timer
+ * processing. The application is polled for new data.
+ *
+ * \param conn A pointer to the uip_conn struct for the connection to
+ * be processed.
+ *
+ * \hideinitializer
+ */
+#define uip_poll_conn(conn) do { uip_conn = conn;       \
+    uip_process(UIP_POLL_REQUEST); } while (0)
+
+#endif /* UIP_TCP */
+
+#if UIP_UDP
+/**
+ * Periodic processing for a UDP connection identified by its number.
+ *
+ * This function is essentially the same as uip_periodic(), but for
+ * UDP connections. It is called in a similar fashion as the
+ * uip_periodic() function:
+ \code
+ for(i = 0; i < UIP_UDP_CONNS; i++) {
+ uip_udp_periodic(i);
+ if(uip_len > 0) {
+ devicedriver_send();
+ }
+ }
+ \endcode
+ *
+ * \note As for the uip_periodic() function, special care has to be
+ * taken when using uIP together with ARP and Ethernet:
+ \code
+ for(i = 0; i < UIP_UDP_CONNS; i++) {
+ uip_udp_periodic(i);
+ if(uip_len > 0) {
+ uip_arp_out();
+ ethernet_devicedriver_send();
+ }
+ }
+ \endcode
+ *
+ * \param conn The number of the UDP connection to be processed.
+ *
+ * \hideinitializer
+ */
+#define uip_udp_periodic(conn) do { uip_udp_conn = &uip_udp_conns[conn]; \
+    uip_process(UIP_UDP_TIMER); } while(0)
+
+/**
+ * Periodic processing for a UDP connection identified by a pointer to
+ * its structure.
+ *
+ * Same as uip_udp_periodic() but takes a pointer to the actual
+ * uip_conn struct instead of an integer as its argument. This
+ * function can be used to force periodic processing of a specific
+ * connection.
+ *
+ * \param conn A pointer to the uip_udp_conn struct for the connection
+ * to be processed.
+ *
+ * \hideinitializer
+ */
+#define uip_udp_periodic_conn(conn) do { uip_udp_conn = conn;   \
+    uip_process(UIP_UDP_TIMER); } while(0)
+#endif /* UIP_UDP */
+
+/** \brief Abandon the reassembly of the current packet */
+void uip_reass_over(void);
+
+/**
+ * The uIP packet buffer.
+ *
+ * The uip_buf array is used to hold incoming and outgoing
+ * packets. The device driver should place incoming data into this
+ * buffer. When sending data, the device driver should read the link
+ * level headers and the TCP/IP headers from this buffer. The size of
+ * the link level headers is configured by the UIP_LLH_LEN define.
+ *
+ * \note The application data need not be placed in this buffer, so
+ * the device driver must read it from the place pointed to by the
+ * uip_appdata pointer as illustrated by the following example:
+ \code
+ void
+ devicedriver_send(void)
+ {
+ hwsend(&uip_buf[0], UIP_LLH_LEN);
+ if(uip_len <= UIP_LLH_LEN + UIP_TCPIP_HLEN) {
+ hwsend(&uip_buf[UIP_LLH_LEN], uip_len - UIP_LLH_LEN);
+ } else {
+ hwsend(&uip_buf[UIP_LLH_LEN], UIP_TCPIP_HLEN);
+ hwsend(uip_appdata, uip_len - UIP_TCPIP_HLEN - UIP_LLH_LEN);
+ }
+ }
+ \endcode
+*/
+extern u8_t uip_buf[UIP_BUFSIZE+2];
+
+
+
+/** @} */
+
+/*---------------------------------------------------------------------------*/
+/* Functions that are used by the uIP application program. Opening and
+ * closing connections, sending and receiving data, etc. is all
+ * handled by the functions below.
+ */
+/**
+ * \defgroup uipappfunc uIP application functions
+ * @{
+ *
+ * Functions used by an application running of top of uIP.
+ */
+
+/**
+ * Start listening to the specified port.
+ *
+ * \note Since this function expects the port number in network byte
+ * order, a conversion using HTONS() or htons() is necessary.
+ *
+ \code
+ uip_listen(HTONS(80));
+ \endcode
+ *
+ * \param port A 16-bit port number in network byte order.
+ */
+void uip_listen(u16_t port);
+
+/**
+ * Stop listening to the specified port.
+ *
+ * \note Since this function expects the port number in network byte
+ * order, a conversion using HTONS() or htons() is necessary.
+ *
+ \code
+ uip_unlisten(HTONS(80));
+ \endcode
+ *
+ * \param port A 16-bit port number in network byte order.
+ */
+void uip_unlisten(u16_t port);
+
+/**
+ * Connect to a remote host using TCP.
+ *
+ * This function is used to start a new connection to the specified
+ * port on the specified host. It allocates a new connection identifier,
+ * sets the connection to the SYN_SENT state and sets the
+ * retransmission timer to 0. This will cause a TCP SYN segment to be
+ * sent out the next time this connection is periodically processed,
+ * which usually is done within 0.5 seconds after the call to
+ * uip_connect().
+ *
+ * \note This function is available only if support for active open
+ * has been configured by defining UIP_ACTIVE_OPEN to 1 in uipopt.h.
+ *
+ * \note Since this function requires the port number to be in network
+ * byte order, a conversion using HTONS() or htons() is necessary.
+ *
+ \code
+ uip_ipaddr_t ipaddr;
+
+ uip_ipaddr(&ipaddr, 192,168,1,2);
+ uip_connect(&ipaddr, HTONS(80));
+ \endcode
+ *
+ * \param ripaddr The IP address of the remote host.
+ *
+ * \param port A 16-bit port number in network byte order.
+ *
+ * \return A pointer to the uIP connection identifier for the new connection,
+ * or NULL if no connection could be allocated.
+ *
+ */
+struct uip_conn *uip_connect(uip_ipaddr_t *ripaddr, u16_t port);
+
+
+
+/**
+ * \internal
+ *
+ * Check if a connection has outstanding (i.e., unacknowledged) data.
+ *
+ * \param conn A pointer to the uip_conn structure for the connection.
+ *
+ * \hideinitializer
+ */
+#define uip_outstanding(conn) ((conn)->len)
+
+/**
+ * Send data on the current connection.
+ *
+ * This function is used to send out a single segment of TCP
+ * data. Only applications that have been invoked by uIP for event
+ * processing can send data.
+ *
+ * The amount of data that actually is sent out after a call to this
+ * function is determined by the maximum amount of data TCP allows. uIP
+ * will automatically crop the data so that only the appropriate
+ * amount of data is sent. The function uip_mss() can be used to query
+ * uIP for the amount of data that actually will be sent.
+ *
+ * \note This function does not guarantee that the sent data will
+ * arrive at the destination. If the data is lost in the network, the
+ * application will be invoked with the uip_rexmit() event being
+ * set. The application will then have to resend the data using this
+ * function.
+ *
+ * \param data A pointer to the data which is to be sent.
+ *
+ * \param len The maximum amount of data bytes to be sent.
+ *
+ * \hideinitializer
+ */
+void uip_send(const void *data, int len);
+
+/**
+ * The length of any incoming data that is currently available (if available)
+ * in the uip_appdata buffer.
+ *
+ * The test function uip_data() must first be used to check if there
+ * is any data available at all.
+ *
+ * \hideinitializer
+ */
+/*void uip_datalen(void);*/
+#define uip_datalen()       uip_len
+
+/**
+ * The length of any out-of-band data (urgent data) that has arrived
+ * on the connection.
+ *
+ * \note The configuration parameter UIP_URGDATA must be set for this
+ * function to be enabled.
+ *
+ * \hideinitializer
+ */
+#define uip_urgdatalen()    uip_urglen
+
+/**
+ * Close the current connection.
+ *
+ * This function will close the current connection in a nice way.
+ *
+ * \hideinitializer
+ */
+#define uip_close()         (uip_flags = UIP_CLOSE)
+
+/**
+ * Abort the current connection.
+ *
+ * This function will abort (reset) the current connection, and is
+ * usually used when an error has occurred that prevents using the
+ * uip_close() function.
+ *
+ * \hideinitializer
+ */
+#define uip_abort()         (uip_flags = UIP_ABORT)
+
+/**
+ * Tell the sending host to stop sending data.
+ *
+ * This function will close our receiver's window so that we stop
+ * receiving data for the current connection.
+ *
+ * \hideinitializer
+ */
+#define uip_stop()          (uip_conn->tcpstateflags |= UIP_STOPPED)
+
+/**
+ * Find out if the current connection has been previously stopped with
+ * uip_stop().
+ *
+ * \hideinitializer
+ */
+#define uip_stopped(conn)   ((conn)->tcpstateflags & UIP_STOPPED)
+
+/**
+ * Restart the current connection, if is has previously been stopped
+ * with uip_stop().
+ *
+ * This function will open the receiver's window again so that we
+ * start receiving data for the current connection.
+ *
+ * \hideinitializer
+ */
+#define uip_restart()         do { uip_flags |= UIP_NEWDATA;    \
+    uip_conn->tcpstateflags &= ~UIP_STOPPED;                    \
+  } while(0)
+
+
+/* uIP tests that can be made to determine in what state the current
+   connection is, and what the application function should do. */
+
+/**
+ * Is the current connection a UDP connection?
+ *
+ * This function checks whether the current connection is a UDP connection.
+ *
+ * \hideinitializer
+ *
+ */
+#define uip_udpconnection() (uip_conn == NULL)
+
+/**
+ * Is new incoming data available?
+ *
+ * Will reduce to non-zero if there is new data for the application
+ * present at the uip_appdata pointer. The size of the data is
+ * available through the uip_len variable.
+ *
+ * \hideinitializer
+ */
+#define uip_newdata()   (uip_flags & UIP_NEWDATA)
+
+/**
+ * Has previously sent data been acknowledged?
+ *
+ * Will reduce to non-zero if the previously sent data has been
+ * acknowledged by the remote host. This means that the application
+ * can send new data.
+ *
+ * \hideinitializer
+ */
+#define uip_acked()   (uip_flags & UIP_ACKDATA)
+
+/**
+ * Has the connection just been connected?
+ *
+ * Reduces to non-zero if the current connection has been connected to
+ * a remote host. This will happen both if the connection has been
+ * actively opened (with uip_connect()) or passively opened (with
+ * uip_listen()).
+ *
+ * \hideinitializer
+ */
+#define uip_connected() (uip_flags & UIP_CONNECTED)
+
+/**
+ * Has the connection been closed by the other end?
+ *
+ * Is non-zero if the connection has been closed by the remote
+ * host. The application may then do the necessary clean-ups.
+ *
+ * \hideinitializer
+ */
+#define uip_closed()    (uip_flags & UIP_CLOSE)
+
+/**
+ * Has the connection been aborted by the other end?
+ *
+ * Non-zero if the current connection has been aborted (reset) by the
+ * remote host.
+ *
+ * \hideinitializer
+ */
+#define uip_aborted()    (uip_flags & UIP_ABORT)
+
+/**
+ * Has the connection timed out?
+ *
+ * Non-zero if the current connection has been aborted due to too many
+ * retransmissions.
+ *
+ * \hideinitializer
+ */
+#define uip_timedout()    (uip_flags & UIP_TIMEDOUT)
+
+/**
+ * Do we need to retransmit previously data?
+ *
+ * Reduces to non-zero if the previously sent data has been lost in
+ * the network, and the application should retransmit it. The
+ * application should send the exact same data as it did the last
+ * time, using the uip_send() function.
+ *
+ * \hideinitializer
+ */
+#define uip_rexmit()     (uip_flags & UIP_REXMIT)
+
+/**
+ * Is the connection being polled by uIP?
+ *
+ * Is non-zero if the reason the application is invoked is that the
+ * current connection has been idle for a while and should be
+ * polled.
+ *
+ * The polling event can be used for sending data without having to
+ * wait for the remote host to send data.
+ *
+ * \hideinitializer
+ */
+#define uip_poll()       (uip_flags & UIP_POLL)
+
+/**
+ * Get the initial maximum segment size (MSS) of the current
+ * connection.
+ *
+ * \hideinitializer
+ */
+#define uip_initialmss()             (uip_conn->initialmss)
+
+/**
+ * Get the current maximum segment size that can be sent on the current
+ * connection.
+ *
+ * The current maximum segment size that can be sent on the
+ * connection is computed from the receiver's window and the MSS of
+ * the connection (which also is available by calling
+ * uip_initialmss()).
+ *
+ * \hideinitializer
+ */
+#define uip_mss()             (uip_conn->mss)
+
+/**
+ * Set up a new UDP connection.
+ *
+ * This function sets up a new UDP connection. The function will
+ * automatically allocate an unused local port for the new
+ * connection. However, another port can be chosen by using the
+ * uip_udp_bind() call, after the uip_udp_new() function has been
+ * called.
+ *
+ * Example:
+ \code
+ uip_ipaddr_t addr;
+ struct uip_udp_conn *c;
+
+ uip_ipaddr(&addr, 192,168,2,1);
+ c = uip_udp_new(&addr, HTONS(12345));
+ if(c != NULL) {
+ uip_udp_bind(c, HTONS(12344));
+ }
+ \endcode
+ * \param ripaddr The IP address of the remote host.
+ *
+ * \param rport The remote port number in network byte order.
+ *
+ * \return The uip_udp_conn structure for the new connection or NULL
+ * if no connection could be allocated.
+ */
+struct uip_udp_conn *uip_udp_new(const uip_ipaddr_t *ripaddr, u16_t rport);
+
+/**
+ * Removed a UDP connection.
+ *
+ * \param conn A pointer to the uip_udp_conn structure for the connection.
+ *
+ * \hideinitializer
+ */
+#define uip_udp_remove(conn) (conn)->lport = 0
+
+/**
+ * Bind a UDP connection to a local port.
+ *
+ * \param conn A pointer to the uip_udp_conn structure for the
+ * connection.
+ *
+ * \param port The local port number, in network byte order.
+ *
+ * \hideinitializer
+ */
+#define uip_udp_bind(conn, port) (conn)->lport = port
+
+/**
+ * Send a UDP datagram of length len on the current connection.
+ *
+ * This function can only be called in response to a UDP event (poll
+ * or newdata). The data must be present in the uip_buf buffer, at the
+ * place pointed to by the uip_appdata pointer.
+ *
+ * \param len The length of the data in the uip_buf buffer.
+ *
+ * \hideinitializer
+ */
+#define uip_udp_send(len) uip_send((char *)uip_appdata, len)
+
+/** @} */
+
+/* uIP convenience and converting functions. */
+
+/**
+ * \defgroup uipconvfunc uIP conversion functions
+ * @{
+ *
+ * These functions can be used for converting between different data
+ * formats used by uIP.
+ */
+
+/**
+ * Convert an IP address to four bytes separated by commas.
+ *
+ * Example:
+ \code
+ uip_ipaddr_t ipaddr;
+ printf("ipaddr=%d.%d.%d.%d\n", uip_ipaddr_to_quad(&ipaddr));
+ \endcode
+ *
+ * \param a A pointer to a uip_ipaddr_t.
+ * \hideinitializer
+ */
+#define uip_ipaddr_to_quad(a) (a)->u8[0],(a)->u8[1],(a)->u8[2],(a)->u8[3]
+
+/**
+ * Construct an IP address from four bytes.
+ *
+ * This function constructs an IP address of the type that uIP handles
+ * internally from four bytes. The function is handy for specifying IP
+ * addresses to use with e.g. the uip_connect() function.
+ *
+ * Example:
+ \code
+ uip_ipaddr_t ipaddr;
+ struct uip_conn *c;
+
+ uip_ipaddr(&ipaddr, 192,168,1,2);
+ c = uip_connect(&ipaddr, HTONS(80));
+ \endcode
+ *
+ * \param addr A pointer to a uip_ipaddr_t variable that will be
+ * filled in with the IP address.
+ *
+ * \param addr0 The first octet of the IP address.
+ * \param addr1 The second octet of the IP address.
+ * \param addr2 The third octet of the IP address.
+ * \param addr3 The forth octet of the IP address.
+ *
+ * \hideinitializer
+ */
+#define uip_ipaddr(addr, addr0,addr1,addr2,addr3) do {  \
+    (addr)->u8[0] = addr0;                              \
+    (addr)->u8[1] = addr1;                              \
+    (addr)->u8[2] = addr2;                              \
+    (addr)->u8[3] = addr3;                              \
+  } while(0)
+
+/**
+ * Construct an IPv6 address from eight 16-bit words.
+ *
+ * This function constructs an IPv6 address.
+ *
+ * \hideinitializer
+ */
+#define uip_ip6addr(addr, addr0,addr1,addr2,addr3,addr4,addr5,addr6,addr7) do { \
+    (addr)->u16[0] = HTONS(addr0);                                      \
+    (addr)->u16[1] = HTONS(addr1);                                      \
+    (addr)->u16[2] = HTONS(addr2);                                      \
+    (addr)->u16[3] = HTONS(addr3);                                      \
+    (addr)->u16[4] = HTONS(addr4);                                      \
+    (addr)->u16[5] = HTONS(addr5);                                      \
+    (addr)->u16[6] = HTONS(addr6);                                      \
+    (addr)->u16[7] = HTONS(addr7);                                      \
+  } while(0)
+
+/**
+ * Construct an IPv6 address from sixteen 8-bit words.
+ *
+ * This function constructs an IPv6 address.
+ *
+ * \hideinitializer
+ */
+#define uip_ip6addr_u8(addr, addr0,addr1,addr2,addr3,addr4,addr5,addr6,addr7,addr8,addr9,addr10,addr11,addr12,addr13,addr14,addr15) do { \
+    (addr)->u8[0] = addr0;                                       \
+    (addr)->u8[1] = addr1;                                       \
+    (addr)->u8[2] = addr2;                                       \
+    (addr)->u8[3] = addr3;                                       \
+    (addr)->u8[4] = addr4;                                       \
+    (addr)->u8[5] = addr5;                                       \
+    (addr)->u8[6] = addr6;                                       \
+    (addr)->u8[7] = addr7;                                       \
+    (addr)->u8[8] = addr8;                                       \
+    (addr)->u8[9] = addr9;                                       \
+    (addr)->u8[10] = addr10;                                     \
+    (addr)->u8[11] = addr11;                                     \
+    (addr)->u8[12] = addr12;                                     \
+    (addr)->u8[13] = addr13;                                     \
+    (addr)->u8[14] = addr14;                                     \
+    (addr)->u8[15] = addr15;                                     \
+  } while(0)
+
+
+/**
+ * Copy an IP address to another IP address.
+ *
+ * Copies an IP address from one place to another.
+ *
+ * Example:
+ \code
+ uip_ipaddr_t ipaddr1, ipaddr2;
+
+ uip_ipaddr(&ipaddr1, 192,16,1,2);
+ uip_ipaddr_copy(&ipaddr2, &ipaddr1);
+ \endcode
+ *
+ * \param dest The destination for the copy.
+ * \param src The source from where to copy.
+ *
+ * \hideinitializer
+ */
+#ifndef uip_ipaddr_copy
+#define uip_ipaddr_copy(dest, src) (*(dest) = *(src))
+#endif
+
+/**
+ * Compare two IP addresses
+ *
+ * Compares two IP addresses.
+ *
+ * Example:
+ \code
+ uip_ipaddr_t ipaddr1, ipaddr2;
+
+ uip_ipaddr(&ipaddr1, 192,16,1,2);
+ if(uip_ipaddr_cmp(&ipaddr2, &ipaddr1)) {
+ printf("They are the same");
+ }
+ \endcode
+ *
+ * \param addr1 The first IP address.
+ * \param addr2 The second IP address.
+ *
+ * \hideinitializer
+ */
+#if !UIP_CONF_IPV6
+#define uip_ipaddr_cmp(addr1, addr2) ((addr1)->u16[0] == (addr2)->u16[0] && \
+				      (addr1)->u16[1] == (addr2)->u16[1])
+#else /* !UIP_CONF_IPV6 */
+#define uip_ipaddr_cmp(addr1, addr2) (memcmp(addr1, addr2, sizeof(uip_ip6addr_t)) == 0)
+#endif /* !UIP_CONF_IPV6 */
+
+/**
+ * Compare two IP addresses with netmasks
+ *
+ * Compares two IP addresses with netmasks. The masks are used to mask
+ * out the bits that are to be compared.
+ *
+ * Example:
+ \code
+ uip_ipaddr_t ipaddr1, ipaddr2, mask;
+
+ uip_ipaddr(&mask, 255,255,255,0);
+ uip_ipaddr(&ipaddr1, 192,16,1,2);
+ uip_ipaddr(&ipaddr2, 192,16,1,3);
+ if(uip_ipaddr_maskcmp(&ipaddr1, &ipaddr2, &mask)) {
+ printf("They are the same");
+ }
+ \endcode
+ *
+ * \param addr1 The first IP address.
+ * \param addr2 The second IP address.
+ * \param mask The netmask.
+ *
+ * \hideinitializer
+ */
+#if !UIP_CONF_IPV6
+#define uip_ipaddr_maskcmp(addr1, addr2, mask)          \
+  (((((u16_t *)addr1)[0] & ((u16_t *)mask)[0]) ==       \
+    (((u16_t *)addr2)[0] & ((u16_t *)mask)[0])) &&      \
+   ((((u16_t *)addr1)[1] & ((u16_t *)mask)[1]) ==       \
+    (((u16_t *)addr2)[1] & ((u16_t *)mask)[1])))
+#else
+#define uip_ipaddr_prefixcmp(addr1, addr2, length) (memcmp(addr1, addr2, length>>3) == 0)
+#endif
+
+
+/**
+ * Check if an address is a broadcast address for a network.
+ *
+ * Checks if an address is the broadcast address for a network. The
+ * network is defined by an IP address that is on the network and the
+ * network's netmask.
+ *
+ * \param addr The IP address.
+ * \param netaddr The network's IP address.
+ * \param netmask The network's netmask.
+ *
+ * \hideinitializer
+ */
+/*#define uip_ipaddr_isbroadcast(addr, netaddr, netmask)
+  ((uip_ipaddr_t *)(addr)).u16 & ((uip_ipaddr_t *)(addr)).u16*/
+
+
+
+/**
+ * Mask out the network part of an IP address.
+ *
+ * Masks out the network part of an IP address, given the address and
+ * the netmask.
+ *
+ * Example:
+ \code
+ uip_ipaddr_t ipaddr1, ipaddr2, netmask;
+
+ uip_ipaddr(&ipaddr1, 192,16,1,2);
+ uip_ipaddr(&netmask, 255,255,255,0);
+ uip_ipaddr_mask(&ipaddr2, &ipaddr1, &netmask);
+ \endcode
+ *
+ * In the example above, the variable "ipaddr2" will contain the IP
+ * address 192.168.1.0.
+ *
+ * \param dest Where the result is to be placed.
+ * \param src The IP address.
+ * \param mask The netmask.
+ *
+ * \hideinitializer
+ */
+#define uip_ipaddr_mask(dest, src, mask) do {                           \
+    ((u16_t *)dest)[0] = ((u16_t *)src)[0] & ((u16_t *)mask)[0];        \
+    ((u16_t *)dest)[1] = ((u16_t *)src)[1] & ((u16_t *)mask)[1];        \
+  } while(0)
+
+/**
+ * Pick the first octet of an IP address.
+ *
+ * Picks out the first octet of an IP address.
+ *
+ * Example:
+ \code
+ uip_ipaddr_t ipaddr;
+ u8_t octet;
+
+ uip_ipaddr(&ipaddr, 1,2,3,4);
+ octet = uip_ipaddr1(&ipaddr);
+ \endcode
+ *
+ * In the example above, the variable "octet" will contain the value 1.
+ *
+ * \hideinitializer
+ */
+#define uip_ipaddr1(addr) ((addr)->u8[0])
+
+/**
+ * Pick the second octet of an IP address.
+ *
+ * Picks out the second octet of an IP address.
+ *
+ * Example:
+ \code
+ uip_ipaddr_t ipaddr;
+ u8_t octet;
+
+ uip_ipaddr(&ipaddr, 1,2,3,4);
+ octet = uip_ipaddr2(&ipaddr);
+ \endcode
+ *
+ * In the example above, the variable "octet" will contain the value 2.
+ *
+ * \hideinitializer
+ */
+#define uip_ipaddr2(addr) ((addr)->u8[1])
+
+/**
+ * Pick the third octet of an IP address.
+ *
+ * Picks out the third octet of an IP address.
+ *
+ * Example:
+ \code
+ uip_ipaddr_t ipaddr;
+ u8_t octet;
+
+ uip_ipaddr(&ipaddr, 1,2,3,4);
+ octet = uip_ipaddr3(&ipaddr);
+ \endcode
+ *
+ * In the example above, the variable "octet" will contain the value 3.
+ *
+ * \hideinitializer
+ */
+#define uip_ipaddr3(addr) ((addr)->u8[2])
+
+/**
+ * Pick the fourth octet of an IP address.
+ *
+ * Picks out the fourth octet of an IP address.
+ *
+ * Example:
+ \code
+ uip_ipaddr_t ipaddr;
+ u8_t octet;
+
+ uip_ipaddr(&ipaddr, 1,2,3,4);
+ octet = uip_ipaddr4(&ipaddr);
+ \endcode
+ *
+ * In the example above, the variable "octet" will contain the value 4.
+ *
+ * \hideinitializer
+ */
+#define uip_ipaddr4(addr) ((addr)->u8[3])
+
+/**
+ * Convert 16-bit quantity from host byte order to network byte order.
+ *
+ * This macro is primarily used for converting constants from host
+ * byte order to network byte order. For converting variables to
+ * network byte order, use the htons() function instead.
+ *
+ * \hideinitializer
+ */
+#ifndef HTONS
+#   if UIP_BYTE_ORDER == UIP_BIG_ENDIAN
+#      define HTONS(n) (n)
+#      define HTONL(n) (n)
+#   else /* UIP_BYTE_ORDER == UIP_BIG_ENDIAN */
+#      define HTONS(n) (u16_t)((((u16_t) (n)) << 8) | (((u16_t) (n)) >> 8))
+#      define HTONL(n) (((u32_t)HTONS(n) << 16) | HTONS((u32_t)(n) >> 16))
+#   endif /* UIP_BYTE_ORDER == UIP_BIG_ENDIAN */
+#else
+#error "HTONS already defined!"
+#endif /* HTONS */
+
+/**
+ * Convert 16-bit quantity from host byte order to network byte order.
+ *
+ * This function is primarily used for converting variables from host
+ * byte order to network byte order. For converting constants to
+ * network byte order, use the HTONS() macro instead.
+ */
+#ifndef htons
+u16_t htons(u16_t val);
+#endif /* htons */
+#ifndef ntohs
+#define ntohs htons
+#endif
+
+#ifndef htonl
+u32_t htonl(u32_t val);
+#endif /* htonl */
+#ifndef ntohl
+#define ntohl htonl
+#endif
+
+/** @} */
+
+/**
+ * Pointer to the application data in the packet buffer.
+ *
+ * This pointer points to the application data when the application is
+ * called. If the application wishes to send data, the application may
+ * use this space to write the data into before calling uip_send().
+ */
+extern void *uip_appdata;
+
+#if UIP_URGDATA > 0
+/* u8_t *uip_urgdata:
+ *
+ * This pointer points to any urgent data that has been received. Only
+ * present if compiled with support for urgent data (UIP_URGDATA).
+ */
+extern void *uip_urgdata;
+#endif /* UIP_URGDATA > 0 */
+
+
+/**
+ * \defgroup uipdrivervars Variables used in uIP device drivers
+ * @{
+ *
+ * uIP has a few global variables that are used in device drivers for
+ * uIP.
+ */
+
+/**
+ * The length of the packet in the uip_buf buffer.
+ *
+ * The global variable uip_len holds the length of the packet in the
+ * uip_buf buffer.
+ *
+ * When the network device driver calls the uIP input function,
+ * uip_len should be set to the length of the packet in the uip_buf
+ * buffer.
+ *
+ * When sending packets, the device driver should use the contents of
+ * the uip_len variable to determine the length of the outgoing
+ * packet.
+ *
+ */
+extern u16_t uip_len;
+
+/**
+ * The length of the extension headers
+ */
+extern u8_t uip_ext_len;
+/** @} */
+
+#if UIP_URGDATA > 0
+extern u16_t uip_urglen, uip_surglen;
+#endif /* UIP_URGDATA > 0 */
+
+
+/**
+ * Representation of a uIP TCP connection.
+ *
+ * The uip_conn structure is used for identifying a connection. All
+ * but one field in the structure are to be considered read-only by an
+ * application. The only exception is the appstate field whose purpose
+ * is to let the application store application-specific state (e.g.,
+ * file pointers) for the connection. The type of this field is
+ * configured in the "uipopt.h" header file.
+ */
+struct uip_conn {
+  uip_ipaddr_t ripaddr;   /**< The IP address of the remote host. */
+
+  u16_t lport;        /**< The local TCP port, in network byte order. */
+  u16_t rport;        /**< The local remote TCP port, in network byte
+			 order. */
+
+  u8_t rcv_nxt[4];    /**< The sequence number that we expect to
+			 receive next. */
+  u8_t snd_nxt[4];    /**< The sequence number that was last sent by
+                         us. */
+  u16_t len;          /**< Length of the data that was previously sent. */
+  u16_t mss;          /**< Current maximum segment size for the
+			 connection. */
+  u16_t initialmss;   /**< Initial maximum segment size for the
+			 connection. */
+  u8_t sa;            /**< Retransmission time-out calculation state
+			 variable. */
+  u8_t sv;            /**< Retransmission time-out calculation state
+			 variable. */
+  u8_t rto;           /**< Retransmission time-out. */
+  u8_t tcpstateflags; /**< TCP state and flags. */
+  u8_t timer;         /**< The retransmission timer. */
+  u8_t nrtx;          /**< The number of retransmissions for the last
+			 segment sent. */
+
+  /** The application state. */
+  uip_tcp_appstate_t appstate;
+};
+
+
+/**
+ * Pointer to the current TCP connection.
+ *
+ * The uip_conn pointer can be used to access the current TCP
+ * connection.
+ */
+
+extern struct uip_conn *uip_conn;
+#if UIP_TCP
+/* The array containing all uIP connections. */
+extern struct uip_conn uip_conns[UIP_CONNS];
+#endif
+
+/**
+ * \addtogroup uiparch
+ * @{
+ */
+
+/**
+ * 4-byte array used for the 32-bit sequence number calculations.
+ */
+extern u8_t uip_acc32[4];
+/** @} */
+
+/**
+ * Representation of a uIP UDP connection.
+ */
+struct uip_udp_conn {
+  uip_ipaddr_t ripaddr;   /**< The IP address of the remote peer. */
+  u16_t lport;        /**< The local port number in network byte order. */
+  u16_t rport;        /**< The remote port number in network byte order. */
+  u8_t  ttl;          /**< Default time-to-live. */
+
+  /** The application state. */
+  uip_udp_appstate_t appstate;
+};
+
+/**
+ * The current UDP connection.
+ */
+extern struct uip_udp_conn *uip_udp_conn;
+extern struct uip_udp_conn uip_udp_conns[UIP_UDP_CONNS];
+
+struct uip_router {
+  int (*activate)(void);
+  int (*deactivate)(void);
+  uip_ipaddr_t *(*lookup)(uip_ipaddr_t *destipaddr, uip_ipaddr_t *nexthop);
+};
+
+#if UIP_CONF_ROUTER
+extern const struct uip_router *uip_router;
+
+/**
+ * uIP routing driver registration function.
+ */
+void uip_router_register(const struct uip_router *router);
+#endif /*UIP_CONF_ROUTER*/
+
+#if UIP_CONF_ICMP6
+struct uip_icmp6_conn {
+  uip_icmp6_appstate_t appstate;
+};
+extern struct uip_icmp6_conn uip_icmp6_conns;
+#endif /*UIP_CONF_ICMP6*/
+
+/**
+ * The uIP TCP/IP statistics.
+ *
+ * This is the variable in which the uIP TCP/IP statistics are gathered.
+ */
+#if UIP_STATISTICS == 1
+extern struct uip_stats uip_stat;
+#define UIP_STAT(s) s
+#else
+#define UIP_STAT(s)
+#endif /* UIP_STATISTICS == 1 */
+
+/**
+ * The structure holding the TCP/IP statistics that are gathered if
+ * UIP_STATISTICS is set to 1.
+ *
+ */
+struct uip_stats {
+  struct {
+    uip_stats_t recv;     /**< Number of received packets at the IP
+			     layer. */
+    uip_stats_t sent;     /**< Number of sent packets at the IP
+			     layer. */
+    uip_stats_t forwarded;/**< Number of forwarded packets at the IP
+			     layer. */
+    uip_stats_t drop;     /**< Number of dropped packets at the IP
+			     layer. */
+    uip_stats_t vhlerr;   /**< Number of packets dropped due to wrong
+			     IP version or header length. */
+    uip_stats_t hblenerr; /**< Number of packets dropped due to wrong
+			     IP length, high byte. */
+    uip_stats_t lblenerr; /**< Number of packets dropped due to wrong
+			     IP length, low byte. */
+    uip_stats_t fragerr;  /**< Number of packets dropped since they
+			     were IP fragments. */
+    uip_stats_t chkerr;   /**< Number of packets dropped due to IP
+			     checksum errors. */
+    uip_stats_t protoerr; /**< Number of packets dropped since they
+			     were neither ICMP, UDP nor TCP. */
+  } ip;                   /**< IP statistics. */
+  struct {
+    uip_stats_t recv;     /**< Number of received ICMP packets. */
+    uip_stats_t sent;     /**< Number of sent ICMP packets. */
+    uip_stats_t drop;     /**< Number of dropped ICMP packets. */
+    uip_stats_t typeerr;  /**< Number of ICMP packets with a wrong
+			     type. */
+    uip_stats_t chkerr;   /**< Number of ICMP packets with a bad
+			     checksum. */
+  } icmp;                 /**< ICMP statistics. */
+#if UIP_TCP
+  struct {
+    uip_stats_t recv;     /**< Number of received TCP segments. */
+    uip_stats_t sent;     /**< Number of sent TCP segments. */
+    uip_stats_t drop;     /**< Number of dropped TCP segments. */
+    uip_stats_t chkerr;   /**< Number of TCP segments with a bad
+			     checksum. */
+    uip_stats_t ackerr;   /**< Number of TCP segments with a bad ACK
+			     number. */
+    uip_stats_t rst;      /**< Number of received TCP RST (reset) segments. */
+    uip_stats_t rexmit;   /**< Number of retransmitted TCP segments. */
+    uip_stats_t syndrop;  /**< Number of dropped SYNs due to too few
+			     connections was available. */
+    uip_stats_t synrst;   /**< Number of SYNs for closed ports,
+			     triggering a RST. */
+  } tcp;                  /**< TCP statistics. */
+#endif
+#if UIP_UDP
+  struct {
+    uip_stats_t drop;     /**< Number of dropped UDP segments. */
+    uip_stats_t recv;     /**< Number of received UDP segments. */
+    uip_stats_t sent;     /**< Number of sent UDP segments. */
+    uip_stats_t chkerr;   /**< Number of UDP segments with a bad
+			     checksum. */
+  } udp;                  /**< UDP statistics. */
+#endif /* UIP_UDP */
+#if UIP_CONF_IPV6
+  struct {
+    uip_stats_t drop;     /**< Number of dropped ND6 packets. */
+    uip_stats_t recv;     /**< Number of received ND6 packets */
+    uip_stats_t sent;     /**< Number of sent ND6 packets */
+  } nd6;
+#endif /*UIP_CONF_IPV6*/
+};
+
+
+/*---------------------------------------------------------------------------*/
+/* All the stuff below this point is internal to uIP and should not be
+ * used directly by an application or by a device driver.
+ */
+/*---------------------------------------------------------------------------*/
+
+
+
+/* u8_t uip_flags:
+ *
+ * When the application is called, uip_flags will contain the flags
+ * that are defined in this file. Please read below for more
+ * information.
+ */
+extern u8_t uip_flags;
+
+/* The following flags may be set in the global variable uip_flags
+   before calling the application callback. The UIP_ACKDATA,
+   UIP_NEWDATA, and UIP_CLOSE flags may both be set at the same time,
+   whereas the others are mutually exclusive. Note that these flags
+   should *NOT* be accessed directly, but only through the uIP
+   functions/macros. */
+
+#define UIP_ACKDATA   1     /* Signifies that the outstanding data was
+			       acked and the application should send
+			       out new data instead of retransmitting
+			       the last data. */
+#define UIP_NEWDATA   2     /* Flags the fact that the peer has sent
+			       us new data. */
+#define UIP_REXMIT    4     /* Tells the application to retransmit the
+			       data that was last sent. */
+#define UIP_POLL      8     /* Used for polling the application, to
+			       check if the application has data that
+			       it wants to send. */
+#define UIP_CLOSE     16    /* The remote host has closed the
+			       connection, thus the connection has
+			       gone away. Or the application signals
+			       that it wants to close the
+			       connection. */
+#define UIP_ABORT     32    /* The remote host has aborted the
+			       connection, thus the connection has
+			       gone away. Or the application signals
+			       that it wants to abort the
+			       connection. */
+#define UIP_CONNECTED 64    /* We have got a connection from a remote
+                               host and have set up a new connection
+                               for it, or an active connection has
+                               been successfully established. */
+
+#define UIP_TIMEDOUT  128   /* The connection has been aborted due to
+			       too many retransmissions. */
+
+
+/**
+ * \brief process the options within a hop by hop or destination option header
+ * \retval 0: nothing to send,
+ * \retval 1: drop pkt
+ * \retval 2: ICMP error message to send
+*/
+/*static u8_t
+uip_ext_hdr_options_process(); */
+
+/* uip_process(flag):
+ *
+ * The actual uIP function which does all the work.
+ */
+void uip_process(u8_t flag);
+
+  /* The following flags are passed as an argument to the uip_process()
+   function. They are used to distinguish between the two cases where
+   uip_process() is called. It can be called either because we have
+   incoming data that should be processed, or because the periodic
+   timer has fired. These values are never used directly, but only in
+   the macros defined in this file. */
+
+#define UIP_DATA          1     /* Tells uIP that there is incoming
+				   data in the uip_buf buffer. The
+				   length of the data is stored in the
+				   global variable uip_len. */
+#define UIP_TIMER         2     /* Tells uIP that the periodic timer
+				   has fired. */
+#define UIP_POLL_REQUEST  3     /* Tells uIP that a connection should
+				   be polled. */
+#define UIP_UDP_SEND_CONN 4     /* Tells uIP that a UDP datagram
+				   should be constructed in the
+				   uip_buf buffer. */
+#if UIP_UDP
+#define UIP_UDP_TIMER     5
+#endif /* UIP_UDP */
+
+/* The TCP states used in the uip_conn->tcpstateflags. */
+#define UIP_CLOSED      0
+#define UIP_SYN_RCVD    1
+#define UIP_SYN_SENT    2
+#define UIP_ESTABLISHED 3
+#define UIP_FIN_WAIT_1  4
+#define UIP_FIN_WAIT_2  5
+#define UIP_CLOSING     6
+#define UIP_TIME_WAIT   7
+#define UIP_LAST_ACK    8
+#define UIP_TS_MASK     15
+
+#define UIP_STOPPED      16
+
+/* The TCP and IP headers. */
+struct uip_tcpip_hdr {
+#if UIP_CONF_IPV6
+  /* IPv6 header. */
+  u8_t vtc,
+    tcflow;
+  u16_t flow;
+  u8_t len[2];
+  u8_t proto, ttl;
+  uip_ip6addr_t srcipaddr, destipaddr;
+#else /* UIP_CONF_IPV6 */
+  /* IPv4 header. */
+  u8_t vhl,
+    tos,
+    len[2],
+    ipid[2],
+    ipoffset[2],
+    ttl,
+    proto;
+  u16_t ipchksum;
+  uip_ipaddr_t srcipaddr, destipaddr;
+#endif /* UIP_CONF_IPV6 */
+
+  /* TCP header. */
+  u16_t srcport,
+    destport;
+  u8_t seqno[4],
+    ackno[4],
+    tcpoffset,
+    flags,
+    wnd[2];
+  u16_t tcpchksum;
+  u8_t urgp[2];
+  u8_t optdata[4];
+};
+
+/* The ICMP and IP headers. */
+struct uip_icmpip_hdr {
+#if UIP_CONF_IPV6
+  /* IPv6 header. */
+  u8_t vtc,
+    tcf;
+  u16_t flow;
+  u8_t len[2];
+  u8_t proto, ttl;
+  uip_ip6addr_t srcipaddr, destipaddr;
+#else /* UIP_CONF_IPV6 */
+  /* IPv4 header. */
+  u8_t vhl,
+    tos,
+    len[2],
+    ipid[2],
+    ipoffset[2],
+    ttl,
+    proto;
+  u16_t ipchksum;
+  uip_ipaddr_t srcipaddr, destipaddr;
+#endif /* UIP_CONF_IPV6 */
+
+  /* ICMP header. */
+  u8_t type, icode;
+  u16_t icmpchksum;
+#if !UIP_CONF_IPV6
+  u16_t id, seqno;
+  u8_t payload[1];
+#endif /* !UIP_CONF_IPV6 */
+};
+
+
+/* The UDP and IP headers. */
+struct uip_udpip_hdr {
+#if UIP_CONF_IPV6
+  /* IPv6 header. */
+  u8_t vtc,
+    tcf;
+  u16_t flow;
+  u8_t len[2];
+  u8_t proto, ttl;
+  uip_ip6addr_t srcipaddr, destipaddr;
+#else /* UIP_CONF_IPV6 */
+  /* IP header. */
+  u8_t vhl,
+    tos,
+    len[2],
+    ipid[2],
+    ipoffset[2],
+    ttl,
+    proto;
+  u16_t ipchksum;
+  uip_ipaddr_t srcipaddr, destipaddr;
+#endif /* UIP_CONF_IPV6 */
+
+  /* UDP header. */
+  u16_t srcport,
+    destport;
+  u16_t udplen;
+  u16_t udpchksum;
+};
+
+/*
+ * In IPv6 the length of the L3 headers before the transport header is
+ * not fixed, due to the possibility to include extension option headers
+ * after the IP header. hence we split here L3 and L4 headers
+ */
+/* The IP header */
+struct uip_ip_hdr {
+#if UIP_CONF_IPV6
+  /* IPV6 header */
+  u8_t vtc;
+  u8_t tcflow;
+  u16_t flow;
+  u8_t len[2];
+  u8_t proto, ttl;
+  uip_ip6addr_t srcipaddr, destipaddr;
+#else /* UIP_CONF_IPV6 */
+  /* IPV4 header */
+  u8_t vhl,
+    tos,
+    len[2],
+    ipid[2],
+    ipoffset[2],
+    ttl,
+    proto;
+  u16_t ipchksum;
+  uip_ipaddr_t srcipaddr, destipaddr;
+#endif /* UIP_CONF_IPV6 */
+};
+
+
+/*
+ * IPv6 extension option headers: we are able to process
+ * the 4 extension headers defined in RFC2460 (IPv6):
+ * - Hop by hop option header, destination option header:
+ *   These two are not used by any core IPv6 protocol, hence
+ *   we just read them and go to the next. They convey options,
+ *   the options defined in RFC2460 are Pad1 and PadN, which do
+ *   some padding, and that we do not need to read (the length
+ *   field in the header is enough)
+ * - Routing header: this one is most notably used by MIPv6,
+ *   which we do not implement, hence we just read it and go
+ *   to the next
+ * - Fragmentation header: we read this header and are able to
+ *   reassemble packets
+ *
+ * We do not offer any means to send packets with extension headers
+ *
+ * We do not implement Authentication and ESP headers, which are
+ * used in IPSec and defined in RFC4302,4303,4305,4385
+ */
+/* common header part */
+struct uip_ext_hdr {
+  u8_t next;
+  u8_t len;
+};
+
+/* Hop by Hop option header */
+struct uip_hbho_hdr {
+  u8_t next;
+  u8_t len;
+};
+
+/* destination option header */
+struct uip_desto_hdr {
+  u8_t next;
+  u8_t len;
+};
+
+/* We do not define structures for PAD1 and PADN options */
+
+/*
+ * routing header
+ * the routing header as 4 common bytes, then routing header type
+ * specific data there are several types of routing header. Type 0 was
+ * deprecated as per RFC5095 most notable other type is 2, used in
+ * RFC3775 (MIPv6) here we do not implement MIPv6, so we just need to
+ * parse the 4 first bytes
+ */
+struct uip_routing_hdr {
+  u8_t next;
+  u8_t len;
+  u8_t routing_type;
+  u8_t seg_left;
+};
+
+/* fragmentation header */
+struct uip_frag_hdr {
+  u8_t next;
+  u8_t res;
+  u16_t offsetresmore;
+  u32_t id;
+};
+
+/*
+ * an option within the destination or hop by hop option headers
+ * it contains type an length, which is true for all options but PAD1
+ */
+struct uip_ext_hdr_opt {
+  u8_t type;
+  u8_t len;
+};
+
+/* PADN option */
+struct uip_ext_hdr_opt_padn {
+  u8_t opt_type;
+  u8_t opt_len;
+};
+
+/* TCP header */
+struct uip_tcp_hdr {
+  u16_t srcport;
+  u16_t destport;
+  u8_t seqno[4];
+  u8_t ackno[4];
+  u8_t tcpoffset;
+  u8_t flags;
+  u8_t  wnd[2];
+  u16_t tcpchksum;
+  u8_t urgp[2];
+  u8_t optdata[4];
+};
+
+/* The ICMP headers. */
+struct uip_icmp_hdr {
+  u8_t type, icode;
+  u16_t icmpchksum;
+#if !UIP_CONF_IPV6
+  u16_t id, seqno;
+#endif /* !UIP_CONF_IPV6 */
+};
+
+
+/* The UDP headers. */
+struct uip_udp_hdr {
+  u16_t srcport;
+  u16_t destport;
+  u16_t udplen;
+  u16_t udpchksum;
+};
+
+
+/**
+ * The buffer size available for user data in the \ref uip_buf buffer.
+ *
+ * This macro holds the available size for user data in the \ref
+ * uip_buf buffer. The macro is intended to be used for checking
+ * bounds of available user data.
+ *
+ * Example:
+ \code
+ snprintf(uip_appdata, UIP_APPDATA_SIZE, "%u\n", i);
+ \endcode
+ *
+ * \hideinitializer
+ */
+#define UIP_APPDATA_SIZE (UIP_BUFSIZE - UIP_LLH_LEN - UIP_TCPIP_HLEN)
+#define UIP_APPDATA_PTR (void *)&uip_buf[UIP_LLH_LEN + UIP_TCPIP_HLEN]
+
+#define UIP_PROTO_ICMP  1
+#define UIP_PROTO_TCP   6
+#define UIP_PROTO_UDP   17
+#define UIP_PROTO_ICMP6 58
+
+
+#if UIP_CONF_IPV6
+/** @{ */
+/** \brief  extension headers types */
+#define UIP_PROTO_HBHO        0
+#define UIP_PROTO_DESTO       60
+#define UIP_PROTO_ROUTING     43
+#define UIP_PROTO_FRAG        44
+#define UIP_PROTO_NONE        59
+/** @} */
+
+/** @{ */
+/** \brief  Destination and Hop By Hop extension headers option types */
+#define UIP_EXT_HDR_OPT_PAD1  0
+#define UIP_EXT_HDR_OPT_PADN  1
+/** @} */
+
+/** @{ */
+/**
+ * \brief Bitmaps for extension header processing
+ *
+ * When processing extension headers, we should record somehow which one we
+ * see, because you cannot have twice the same header, except for destination
+ * We store all this in one u8_t bitmap one bit for each header expected. The
+ * order in the bitmap is the order recommended in RFC2460
+ */
+#define UIP_EXT_HDR_BITMAP_HBHO 0x01
+#define UIP_EXT_HDR_BITMAP_DESTO1 0x02
+#define UIP_EXT_HDR_BITMAP_ROUTING 0x04
+#define UIP_EXT_HDR_BITMAP_FRAG 0x08
+#define UIP_EXT_HDR_BITMAP_AH 0x10
+#define UIP_EXT_HDR_BITMAP_ESP 0x20
+#define UIP_EXT_HDR_BITMAP_DESTO2 0x40
+/** @} */
+
+
+#endif /* UIP_CONF_IPV6 */
+
+
+/* Header sizes. */
+#if UIP_CONF_IPV6
+#define UIP_IPH_LEN    40
+#define UIP_FRAGH_LEN  8
+#else /* UIP_CONF_IPV6 */
+#define UIP_IPH_LEN    20    /* Size of IP header */
+#endif /* UIP_CONF_IPV6 */
+
+#define UIP_UDPH_LEN    8    /* Size of UDP header */
+#define UIP_TCPH_LEN   20    /* Size of TCP header */
+#ifdef UIP_IPH_LEN
+#define UIP_ICMPH_LEN   4    /* Size of ICMP header */
+#endif
+#define UIP_IPUDPH_LEN (UIP_UDPH_LEN + UIP_IPH_LEN)    /* Size of IP +
+                        * UDP
+							   * header */
+#define UIP_IPTCPH_LEN (UIP_TCPH_LEN + UIP_IPH_LEN)    /* Size of IP +
+							   * TCP
+							   * header */
+#define UIP_TCPIP_HLEN UIP_IPTCPH_LEN
+#define UIP_IPICMPH_LEN (UIP_IPH_LEN + UIP_ICMPH_LEN) /* size of ICMP
+                                                         + IP header */
+#define UIP_LLIPH_LEN (UIP_LLH_LEN + UIP_IPH_LEN)    /* size of L2
+                                                        + IP header */
+#if UIP_CONF_IPV6
+/**
+ * The sums below are quite used in ND. When used for uip_buf, we
+ * include link layer length when used for uip_len, we do not, hence
+ * we need values with and without LLH_LEN we do not use capital
+ * letters as these values are variable
+ */
+#define uip_l2_l3_hdr_len (UIP_LLH_LEN + UIP_IPH_LEN + uip_ext_len)
+#define uip_l2_l3_icmp_hdr_len (UIP_LLH_LEN + UIP_IPH_LEN + uip_ext_len + UIP_ICMPH_LEN)
+#define uip_l3_hdr_len (UIP_IPH_LEN + uip_ext_len)
+#define uip_l3_icmp_hdr_len (UIP_IPH_LEN + uip_ext_len + UIP_ICMPH_LEN)
+#endif /*UIP_CONF_IPV6*/
+
+
+#if UIP_FIXEDADDR
+extern const uip_ipaddr_t uip_hostaddr, uip_netmask, uip_draddr;
+#else /* UIP_FIXEDADDR */
+extern uip_ipaddr_t uip_hostaddr, uip_netmask, uip_draddr;
+#endif /* UIP_FIXEDADDR */
+extern const uip_ipaddr_t uip_broadcast_addr;
+extern const uip_ipaddr_t uip_all_zeroes_addr;
+
+#if UIP_FIXEDETHADDR
+extern const uip_lladdr_t uip_lladdr;
+#else
+extern uip_lladdr_t uip_lladdr;
+#endif
+
+
+
+
+#ifdef UIP_CONF_IPV6
+/**
+ * \brief Is IPv6 address a the unspecified address
+ * a is of type uip_ipaddr_t
+ */
+#define uip_is_addr_unspecified(a)               \
+  ((((a)->u16[0]) == 0) &&                       \
+   (((a)->u16[1]) == 0) &&                       \
+   (((a)->u16[2]) == 0) &&                       \
+   (((a)->u16[3]) == 0) &&                       \
+   (((a)->u16[4]) == 0) &&                       \
+   (((a)->u16[5]) == 0) &&                       \
+   (((a)->u16[6]) == 0) &&                       \
+   (((a)->u16[7]) == 0))
+
+/** \brief Is IPv6 address a the link local all-nodes multicast address */
+#define uip_is_addr_linklocal_allnodes_mcast(a)     \
+  ((((a)->u8[0]) == 0xff) &&                        \
+   (((a)->u8[1]) == 0x02) &&                        \
+   (((a)->u16[1]) == 0) &&                          \
+   (((a)->u16[2]) == 0) &&                          \
+   (((a)->u16[3]) == 0) &&                          \
+   (((a)->u16[4]) == 0) &&                          \
+   (((a)->u16[5]) == 0) &&                          \
+   (((a)->u16[6]) == 0) &&                          \
+   (((a)->u8[14]) == 0) &&                          \
+   (((a)->u8[15]) == 0x01))
+
+/** \brief set IP address a to unspecified */
+#define uip_create_unspecified(a) uip_ip6addr(a, 0, 0, 0, 0, 0, 0, 0, 0)
+
+/** \brief set IP address a to the link local all-nodes multicast address */
+#define uip_create_linklocal_allnodes_mcast(a) uip_ip6addr(a, 0xff02, 0, 0, 0, 0, 0, 0, 0x0001)
+
+/** \brief set IP address a to the link local all-routers multicast address */
+#define uip_create_linklocal_allrouters_mcast(a) uip_ip6addr(a, 0xff02, 0, 0, 0, 0, 0, 0, 0x0002)
+
+/**
+ * \brief  is addr (a) a solicited node multicast address, see RFC3513
+ *  a is of type uip_ipaddr_t*
+ */
+#define uip_is_addr_solicited_node(a)           \
+  ((((a)->u8[0]) == 0xFF) &&                     \
+  (((a)->u8[1]) == 0x02) &&                     \
+  (((a)->u16[1]) == 0) &&                       \
+  (((a)->u16[2]) == 0) &&                       \
+  (((a)->u16[3]) == 0) &&                       \
+  (((a)->u16[4]) == 0) &&                       \
+  (((a)->u16[5]) == 1) &&                       \
+  (((a)->u8[12]) == 0xFF))
+
+/**
+ * \briefput in b the solicited node address corresponding to address a
+ * both a and b are of type uip_ipaddr_t*
+ * */
+#define uip_create_solicited_node(a, b)    \
+  (((b)->u8[0]) = 0xFF);                        \
+  (((b)->u8[1]) = 0x02);                        \
+  (((b)->u16[1]) = 0);                          \
+  (((b)->u16[2]) = 0);                          \
+  (((b)->u16[3]) = 0);                          \
+  (((b)->u16[4]) = 0);                          \
+  (((b)->u8[10]) = 0);                          \
+  (((b)->u8[11]) = 0x01);                       \
+  (((b)->u8[12]) = 0xFF);                       \
+  (((b)->u8[13]) = ((a)->u8[13]));              \
+  (((b)->u16[7]) = ((a)->u16[7]))
+
+/**
+ * \brief is addr (a) a link local unicast address, see RFC3513
+ *  i.e. is (a) on prefix FE80::/10
+ *  a is of type uip_ipaddr_t*
+ */
+#define uip_is_addr_link_local(a) \
+  ((((a)->u8[0]) == 0xFE) && \
+  (((a)->u8[1]) == 0x80))
+
+/**
+ * \brief was addr (a) forged based on the mac address m
+ * a type is uip_ipaddr_t
+ * m type is uiplladdr_t
+ */
+#if UIP_CONF_LL_802154
+#define uip_is_addr_mac_addr_based(a, m) \
+  ((((a)->u8[8])  == (((m)->addr[0]) ^ 0x02)) &&   \
+   (((a)->u8[9])  == (m)->addr[1]) &&            \
+   (((a)->u8[10]) == (m)->addr[2]) &&            \
+   (((a)->u8[11]) == (m)->addr[3]) &&            \
+   (((a)->u8[12]) == (m)->addr[4]) &&            \
+   (((a)->u8[13]) == (m)->addr[5]) &&            \
+   (((a)->u8[14]) == (m)->addr[6]) &&            \
+   (((a)->u8[15]) == (m)->addr[7]))
+#else
+
+#define uip_is_addr_mac_addr_based(a, m) \
+  ((((a)->u8[8])  == (((m)->addr[0]) | 0x02)) &&   \
+   (((a)->u8[9])  == (m)->addr[1]) &&            \
+   (((a)->u8[10]) == (m)->addr[2]) &&            \
+   (((a)->u8[11]) == 0xff) &&            \
+   (((a)->u8[12]) == 0xfe) &&            \
+   (((a)->u8[13]) == (m)->addr[3]) &&            \
+   (((a)->u8[14]) == (m)->addr[4]) &&            \
+   (((a)->u8[15]) == (m)->addr[5]))
+
+#endif /*UIP_CONF_LL_802154*/
+
+/**
+ * \brief is address a multicast address, see RFC 3513
+ * a is of type uip_ipaddr_t*
+ * */
+#define uip_is_addr_mcast(a)                    \
+  (((a)->u8[0]) == 0xFF)
+
+/**
+ * \brief is group-id of multicast address a
+ * the all nodes group-id
+ */
+#define uip_is_mcast_group_id_all_nodes(a) \
+  ((((a)->u16[1])  == 0) &&                 \
+   (((a)->u16[2])  == 0) &&                 \
+   (((a)->u16[3])  == 0) &&                 \
+   (((a)->u16[4])  == 0) &&                 \
+   (((a)->u16[5])  == 0) &&                 \
+   (((a)->u16[6])  == 0) &&                 \
+   (((a)->u8[14])  == 0) &&                 \
+   (((a)->u8[15])  == 1))
+
+/**
+ * \brief is group-id of multicast address a
+ * the all routers group-id
+ */
+#define uip_is_mcast_group_id_all_routers(a) \
+  ((((a)->u16[1])  == 0) &&                 \
+   (((a)->u16[2])  == 0) &&                 \
+   (((a)->u16[3])  == 0) &&                 \
+   (((a)->u16[4])  == 0) &&                 \
+   (((a)->u16[5])  == 0) &&                 \
+   (((a)->u16[6])  == 0) &&                 \
+   (((a)->u8[14])  == 0) &&                 \
+   (((a)->u8[15])  == 2))
+
+
+#endif /*UIP_CONF_IPV6*/
+
+/**
+ * Calculate the Internet checksum over a buffer.
+ *
+ * The Internet checksum is the one's complement of the one's
+ * complement sum of all 16-bit words in the buffer.
+ *
+ * See RFC1071.
+ *
+ * \param buf A pointer to the buffer over which the checksum is to be
+ * computed.
+ *
+ * \param len The length of the buffer over which the checksum is to
+ * be computed.
+ *
+ * \return The Internet checksum of the buffer.
+ */
+u16_t uip_chksum(u16_t *buf, u16_t len);
+
+/**
+ * Calculate the IP header checksum of the packet header in uip_buf.
+ *
+ * The IP header checksum is the Internet checksum of the 20 bytes of
+ * the IP header.
+ *
+ * \return The IP header checksum of the IP header in the uip_buf
+ * buffer.
+ */
+u16_t uip_ipchksum(void);
+
+/**
+ * Calculate the TCP checksum of the packet in uip_buf and uip_appdata.
+ *
+ * The TCP checksum is the Internet checksum of data contents of the
+ * TCP segment, and a pseudo-header as defined in RFC793.
+ *
+ * \return The TCP checksum of the TCP segment in uip_buf and pointed
+ * to by uip_appdata.
+ */
+u16_t uip_tcpchksum(void);
+
+/**
+ * Calculate the UDP checksum of the packet in uip_buf and uip_appdata.
+ *
+ * The UDP checksum is the Internet checksum of data contents of the
+ * UDP segment, and a pseudo-header as defined in RFC768.
+ *
+ * \return The UDP checksum of the UDP segment in uip_buf and pointed
+ * to by uip_appdata.
+ */
+u16_t uip_udpchksum(void);
+
+/**
+ * Calculate the ICMP checksum of the packet in uip_buf.
+ *
+ * \return The ICMP checksum of the ICMP packet in uip_buf
+ */
+u16_t uip_icmp6chksum(void);
+
+
+#endif /* __UIP_H__ */
+
+
+/** @} */
+
diff --git a/lib/lufa/Projects/Webserver/Lib/uip/uip_arp.c b/lib/lufa/Projects/Webserver/Lib/uip/uip_arp.c
new file mode 100644
index 0000000000..fcb783b140
--- /dev/null
+++ b/lib/lufa/Projects/Webserver/Lib/uip/uip_arp.c
@@ -0,0 +1,432 @@
+/**
+ * \addtogroup uip
+ * @{
+ */
+
+/**
+ * \defgroup uiparp uIP Address Resolution Protocol
+ * @{
+ *
+ * The Address Resolution Protocol ARP is used for mapping between IP
+ * addresses and link level addresses such as the Ethernet MAC
+ * addresses. ARP uses broadcast queries to ask for the link level
+ * address of a known IP address and the host which is configured with
+ * the IP address for which the query was meant, will respond with its
+ * link level address.
+ *
+ * \note This ARP implementation only supports Ethernet.
+ */
+
+/**
+ * \file
+ * Implementation of the ARP Address Resolution Protocol.
+ * \author Adam Dunkels <adam@dunkels.com>
+ *
+ */
+
+/*
+ * Copyright (c) 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.
+ *
+ * This file is part of the uIP TCP/IP stack.
+ *
+ * $Id: uip_arp.c,v 1.5 2008/02/07 01:35:00 adamdunkels Exp $
+ *
+ */
+
+
+#include "uip_arp.h"
+
+#include <string.h>
+
+struct arp_hdr {
+  struct uip_eth_hdr ethhdr;
+  u16_t hwtype;
+  u16_t protocol;
+  u8_t hwlen;
+  u8_t protolen;
+  u16_t opcode;
+  struct uip_eth_addr shwaddr;
+  uip_ipaddr_t sipaddr;
+  struct uip_eth_addr dhwaddr;
+  uip_ipaddr_t dipaddr;
+};
+
+struct ethip_hdr {
+  struct uip_eth_hdr ethhdr;
+  /* IP header. */
+  u8_t vhl,
+    tos,
+    len[2],
+    ipid[2],
+    ipoffset[2],
+    ttl,
+    proto;
+  u16_t ipchksum;
+  uip_ipaddr_t srcipaddr, destipaddr;
+};
+
+#define ARP_REQUEST 1
+#define ARP_REPLY   2
+
+#define ARP_HWTYPE_ETH 1
+
+struct arp_entry {
+  uip_ipaddr_t ipaddr;
+  struct uip_eth_addr ethaddr;
+  u8_t time;
+};
+
+static const struct uip_eth_addr broadcast_ethaddr =
+  {{0xff,0xff,0xff,0xff,0xff,0xff}};
+static const u16_t broadcast_ipaddr[2] = {0xffff,0xffff};
+
+static struct arp_entry arp_table[UIP_ARPTAB_SIZE];
+static uip_ipaddr_t ipaddr;
+static u8_t i, c;
+
+static u8_t arptime;
+static u8_t tmpage;
+
+#define BUF   ((struct arp_hdr *)&uip_buf[0])
+#define IPBUF ((struct ethip_hdr *)&uip_buf[0])
+
+#define DEBUG 0
+#if DEBUG
+#include <stdio.h>
+#define PRINTF(...) printf(__VA_ARGS__)
+#else
+#define PRINTF(...)
+#endif
+
+/*-----------------------------------------------------------------------------------*/
+/**
+ * Initialize the ARP module.
+ *
+ */
+/*-----------------------------------------------------------------------------------*/
+void
+uip_arp_init(void)
+{
+  for(i = 0; i < UIP_ARPTAB_SIZE; ++i) {
+    memset(&arp_table[i].ipaddr, 0, 4);
+  }
+}
+/*-----------------------------------------------------------------------------------*/
+/**
+ * Periodic ARP processing function.
+ *
+ * This function performs periodic timer processing in the ARP module
+ * and should be called at regular intervals. The recommended interval
+ * is 10 seconds between the calls.
+ *
+ */
+/*-----------------------------------------------------------------------------------*/
+void
+uip_arp_timer(void)
+{
+  struct arp_entry *tabptr = NULL;
+
+  ++arptime;
+  for(i = 0; i < UIP_ARPTAB_SIZE; ++i) {
+    tabptr = &arp_table[i];
+    if(uip_ipaddr_cmp(&tabptr->ipaddr, &uip_all_zeroes_addr) &&
+       arptime - tabptr->time >= UIP_ARP_MAXAGE) {
+      memset(&tabptr->ipaddr, 0, 4);
+    }
+  }
+
+}
+/*-----------------------------------------------------------------------------------*/
+static void
+uip_arp_update(uip_ipaddr_t *ipaddr, struct uip_eth_addr *ethaddr)
+{
+  register struct arp_entry *tabptr = NULL;
+  /* Walk through the ARP mapping table and try to find an entry to
+     update. If none is found, the IP -> MAC address mapping is
+     inserted in the ARP table. */
+  for(i = 0; i < UIP_ARPTAB_SIZE; ++i) {
+
+    tabptr = &arp_table[i];
+    /* Only check those entries that are actually in use. */
+    if(!uip_ipaddr_cmp(&tabptr->ipaddr, &uip_all_zeroes_addr)) {
+
+      /* Check if the source IP address of the incoming packet matches
+         the IP address in this ARP table entry. */
+      if(uip_ipaddr_cmp(ipaddr, &tabptr->ipaddr)) {
+
+	/* An old entry found, update this and return. */
+	memcpy(tabptr->ethaddr.addr, ethaddr->addr, 6);
+	tabptr->time = arptime;
+
+	return;
+      }
+    }
+  }
+
+  /* If we get here, no existing ARP table entry was found, so we
+     create one. */
+
+  /* First, we try to find an unused entry in the ARP table. */
+  for(i = 0; i < UIP_ARPTAB_SIZE; ++i) {
+    tabptr = &arp_table[i];
+    if(uip_ipaddr_cmp(&tabptr->ipaddr, &uip_all_zeroes_addr)) {
+      break;
+    }
+  }
+
+  /* If no unused entry is found, we try to find the oldest entry and
+     throw it away. */
+  if(i == UIP_ARPTAB_SIZE) {
+    tmpage = 0;
+    c = 0;
+    for(i = 0; i < UIP_ARPTAB_SIZE; ++i) {
+      tabptr = &arp_table[i];
+      if(arptime - tabptr->time > tmpage) {
+	tmpage = arptime - tabptr->time;
+	c = i;
+      }
+    }
+    i = c;
+    tabptr = &arp_table[i];
+  }
+
+  /* Now, i is the ARP table entry which we will fill with the new
+     information. */
+  uip_ipaddr_copy(&tabptr->ipaddr, ipaddr);
+  memcpy(tabptr->ethaddr.addr, ethaddr->addr, 6);
+  tabptr->time = arptime;
+}
+/*-----------------------------------------------------------------------------------*/
+/**
+ * ARP processing for incoming IP packets
+ *
+ * This function should be called by the device driver when an IP
+ * packet has been received. The function will check if the address is
+ * in the ARP cache, and if so the ARP cache entry will be
+ * refreshed. If no ARP cache entry was found, a new one is created.
+ *
+ * This function expects an IP packet with a prepended Ethernet header
+ * in the uip_buf[] buffer, and the length of the packet in the global
+ * variable uip_len.
+ */
+/*-----------------------------------------------------------------------------------*/
+#if 0
+void
+uip_arp_ipin(void)
+{
+  uip_len -= sizeof(struct uip_eth_hdr);
+
+  /* Only insert/update an entry if the source IP address of the
+     incoming IP packet comes from a host on the local network. */
+  if((IPBUF->srcipaddr[0] & uip_netmask[0]) !=
+     (uip_hostaddr[0] & uip_netmask[0])) {
+    return;
+  }
+  if((IPBUF->srcipaddr[1] & uip_netmask[1]) !=
+     (uip_hostaddr[1] & uip_netmask[1])) {
+    return;
+  }
+  uip_arp_update(IPBUF->srcipaddr, &(IPBUF->ethhdr.src));
+
+  return;
+}
+#endif /* 0 */
+/*-----------------------------------------------------------------------------------*/
+/**
+ * ARP processing for incoming ARP packets.
+ *
+ * This function should be called by the device driver when an ARP
+ * packet has been received. The function will act differently
+ * depending on the ARP packet type: if it is a reply for a request
+ * that we previously sent out, the ARP cache will be filled in with
+ * the values from the ARP reply. If the incoming ARP packet is an ARP
+ * request for our IP address, an ARP reply packet is created and put
+ * into the uip_buf[] buffer.
+ *
+ * When the function returns, the value of the global variable uip_len
+ * indicates whether the device driver should send out a packet or
+ * not. If uip_len is zero, no packet should be sent. If uip_len is
+ * non-zero, it contains the length of the outbound packet that is
+ * present in the uip_buf[] buffer.
+ *
+ * This function expects an ARP packet with a prepended Ethernet
+ * header in the uip_buf[] buffer, and the length of the packet in the
+ * global variable uip_len.
+ */
+/*-----------------------------------------------------------------------------------*/
+void
+uip_arp_arpin(void)
+{
+  if(uip_len < sizeof(struct arp_hdr)) {
+    uip_len = 0;
+    return;
+  }
+  uip_len = 0;
+
+  switch(BUF->opcode) {
+  case HTONS(ARP_REQUEST):
+    /* ARP request. If it asked for our address, we send out a
+       reply. */
+    /*    if(BUF->dipaddr[0] == uip_hostaddr[0] &&
+	  BUF->dipaddr[1] == uip_hostaddr[1]) {*/
+    PRINTF("uip_arp_arpin: request for %d.%d.%d.%d (we are %d.%d.%d.%d)\n",
+	   BUF->dipaddr.u8[0], BUF->dipaddr.u8[1],
+	   BUF->dipaddr.u8[2], BUF->dipaddr.u8[3],
+	   uip_hostaddr.u8[0], uip_hostaddr.u8[1],
+	   uip_hostaddr.u8[2], uip_hostaddr.u8[3]);
+    if(uip_ipaddr_cmp(&BUF->dipaddr, &uip_hostaddr)) {
+      /* First, we register the one who made the request in our ARP
+	 table, since it is likely that we will do more communication
+	 with this host in the future. */
+      uip_arp_update(&BUF->sipaddr, &BUF->shwaddr);
+
+      BUF->opcode = HTONS(ARP_REPLY);
+
+      memcpy(BUF->dhwaddr.addr, BUF->shwaddr.addr, 6);
+      memcpy(BUF->shwaddr.addr, uip_ethaddr.addr, 6);
+      memcpy(BUF->ethhdr.src.addr, uip_ethaddr.addr, 6);
+      memcpy(BUF->ethhdr.dest.addr, BUF->dhwaddr.addr, 6);
+
+      uip_ipaddr_copy(&BUF->dipaddr, &BUF->sipaddr);
+      uip_ipaddr_copy(&BUF->sipaddr, &uip_hostaddr);
+
+      BUF->ethhdr.type = HTONS(UIP_ETHTYPE_ARP);
+      uip_len = sizeof(struct arp_hdr);
+    }
+    break;
+  case HTONS(ARP_REPLY):
+    /* ARP reply. We insert or update the ARP table if it was meant
+       for us. */
+    if(uip_ipaddr_cmp(&BUF->dipaddr, &uip_hostaddr)) {
+      uip_arp_update(&BUF->sipaddr, &BUF->shwaddr);
+    }
+    break;
+  }
+
+  return;
+}
+/*-----------------------------------------------------------------------------------*/
+/**
+ * Prepend Ethernet header to an outbound IP packet and see if we need
+ * to send out an ARP request.
+ *
+ * This function should be called before sending out an IP packet. The
+ * function checks the destination IP address of the IP packet to see
+ * what Ethernet MAC address that should be used as a destination MAC
+ * address on the Ethernet.
+ *
+ * If the destination IP address is in the local network (determined
+ * by logical ANDing of netmask and our IP address), the function
+ * checks the ARP cache to see if an entry for the destination IP
+ * address is found. If so, an Ethernet header is prepended and the
+ * function returns. If no ARP cache entry is found for the
+ * destination IP address, the packet in the uip_buf[] is replaced by
+ * an ARP request packet for the IP address. The IP packet is dropped
+ * and it is assumed that they higher level protocols (e.g., TCP)
+ * eventually will retransmit the dropped packet.
+ *
+ * If the destination IP address is not on the local network, the IP
+ * address of the default router is used instead.
+ *
+ * When the function returns, a packet is present in the uip_buf[]
+ * buffer, and the length of the packet is in the global variable
+ * uip_len.
+ */
+/*-----------------------------------------------------------------------------------*/
+void
+uip_arp_out(void)
+{
+  struct arp_entry *tabptr = NULL;
+
+  /* Find the destination IP address in the ARP table and construct
+     the Ethernet header. If the destination IP address isn't on the
+     local network, we use the default router's IP address instead.
+
+     If not ARP table entry is found, we overwrite the original IP
+     packet with an ARP request for the IP address. */
+
+  /* First check if destination is a local broadcast. */
+  if(uip_ipaddr_cmp(&IPBUF->destipaddr, &uip_broadcast_addr)) {
+    memcpy(IPBUF->ethhdr.dest.addr, broadcast_ethaddr.addr, 6);
+  } else {
+    /* Check if the destination address is on the local network. */
+    if(!uip_ipaddr_maskcmp(&IPBUF->destipaddr, &uip_hostaddr, &uip_netmask)) {
+      /* Destination address was not on the local network, so we need to
+	 use the default router's IP address instead of the destination
+	 address when determining the MAC address. */
+      uip_ipaddr_copy(&ipaddr, &uip_draddr);
+    } else {
+      /* Else, we use the destination IP address. */
+      uip_ipaddr_copy(&ipaddr, &IPBUF->destipaddr);
+    }
+
+    for(i = 0; i < UIP_ARPTAB_SIZE; ++i) {
+      tabptr = &arp_table[i];
+      if(uip_ipaddr_cmp(&ipaddr, &tabptr->ipaddr)) {
+	break;
+      }
+    }
+
+    if(i == UIP_ARPTAB_SIZE) {
+      /* The destination address was not in our ARP table, so we
+	 overwrite the IP packet with an ARP request. */
+
+      memset(BUF->ethhdr.dest.addr, 0xff, 6);
+      memset(BUF->dhwaddr.addr, 0x00, 6);
+      memcpy(BUF->ethhdr.src.addr, uip_ethaddr.addr, 6);
+      memcpy(BUF->shwaddr.addr, uip_ethaddr.addr, 6);
+
+      uip_ipaddr_copy(&BUF->dipaddr, &ipaddr);
+      uip_ipaddr_copy(&BUF->sipaddr, &uip_hostaddr);
+      BUF->opcode = HTONS(ARP_REQUEST); /* ARP request. */
+      BUF->hwtype = HTONS(ARP_HWTYPE_ETH);
+      BUF->protocol = HTONS(UIP_ETHTYPE_IP);
+      BUF->hwlen = 6;
+      BUF->protolen = 4;
+      BUF->ethhdr.type = HTONS(UIP_ETHTYPE_ARP);
+
+      uip_appdata = &uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN];
+
+      uip_len = sizeof(struct arp_hdr);
+      return;
+    }
+
+    /* Build an ethernet header. */
+    memcpy(IPBUF->ethhdr.dest.addr, tabptr->ethaddr.addr, 6);
+  }
+  memcpy(IPBUF->ethhdr.src.addr, uip_ethaddr.addr, 6);
+
+  IPBUF->ethhdr.type = HTONS(UIP_ETHTYPE_IP);
+
+  uip_len += sizeof(struct uip_eth_hdr);
+}
+/*-----------------------------------------------------------------------------------*/
+
+/** @} */
+/** @} */
+
diff --git a/lib/lufa/Projects/Webserver/Lib/uip/uip_arp.h b/lib/lufa/Projects/Webserver/Lib/uip/uip_arp.h
new file mode 100644
index 0000000000..4e78ce7b77
--- /dev/null
+++ b/lib/lufa/Projects/Webserver/Lib/uip/uip_arp.h
@@ -0,0 +1,146 @@
+/**
+ * \addtogroup uip
+ * @{
+ */
+
+/**
+ * \addtogroup uiparp
+ * @{
+ */
+
+/**
+ * \file
+ * Macros and definitions for the ARP module.
+ * \author Adam Dunkels <adam@dunkels.com>
+ */
+
+
+/*
+ * Copyright (c) 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.
+ *
+ * This file is part of the uIP TCP/IP stack.
+ *
+ * $Id: uip_arp.h,v 1.2 2006/08/26 23:58:45 oliverschmidt Exp $
+ *
+ */
+
+#ifndef __UIP_ARP_H__
+#define __UIP_ARP_H__
+
+#include "uip.h"
+
+
+extern struct uip_eth_addr uip_ethaddr;
+
+/**
+ * The Ethernet header.
+ */
+struct uip_eth_hdr {
+  struct uip_eth_addr dest;
+  struct uip_eth_addr src;
+  u16_t type;
+};
+
+#define UIP_ETHTYPE_ARP  0x0806
+#define UIP_ETHTYPE_IP   0x0800
+#define UIP_ETHTYPE_IPV6 0x86dd
+
+
+/* The uip_arp_init() function must be called before any of the other
+   ARP functions. */
+void uip_arp_init(void);
+
+/* The uip_arp_ipin() function should be called whenever an IP packet
+   arrives from the Ethernet. This function refreshes the ARP table or
+   inserts a new mapping if none exists. The function assumes that an
+   IP packet with an Ethernet header is present in the uip_buf buffer
+   and that the length of the packet is in the uip_len variable. */
+/*void uip_arp_ipin(void);*/
+#define uip_arp_ipin()
+
+/* The uip_arp_arpin() should be called when an ARP packet is received
+   by the Ethernet driver. This function also assumes that the
+   Ethernet frame is present in the uip_buf buffer. When the
+   uip_arp_arpin() function returns, the contents of the uip_buf
+   buffer should be sent out on the Ethernet if the uip_len variable
+   is > 0. */
+void uip_arp_arpin(void);
+
+/* The uip_arp_out() function should be called when an IP packet
+   should be sent out on the Ethernet. This function creates an
+   Ethernet header before the IP header in the uip_buf buffer. The
+   Ethernet header will have the correct Ethernet MAC destination
+   address filled in if an ARP table entry for the destination IP
+   address (or the IP address of the default router) is present. If no
+   such table entry is found, the IP packet is overwritten with an ARP
+   request and we rely on TCP to retransmit the packet that was
+   overwritten. In any case, the uip_len variable holds the length of
+   the Ethernet frame that should be transmitted. */
+void uip_arp_out(void);
+
+/* The uip_arp_timer() function should be called every ten seconds. It
+   is responsible for flushing old entries in the ARP table. */
+void uip_arp_timer(void);
+
+/** @} */
+
+/**
+ * \addtogroup uipconffunc
+ * @{
+ */
+
+
+/**
+ * Specifiy the Ethernet MAC address.
+ *
+ * The ARP code needs to know the MAC address of the Ethernet card in
+ * order to be able to respond to ARP queries and to generate working
+ * Ethernet headers.
+ *
+ * \note This macro only specifies the Ethernet MAC address to the ARP
+ * code. It cannot be used to change the MAC address of the Ethernet
+ * card.
+ *
+ * \param eaddr A pointer to a struct uip_eth_addr containing the
+ * Ethernet MAC address of the Ethernet card.
+ *
+ * \hideinitializer
+ */
+#define uip_setethaddr(eaddr) do {uip_ethaddr.addr[0] = eaddr.addr[0]; \
+                              uip_ethaddr.addr[1] = eaddr.addr[1];\
+                              uip_ethaddr.addr[2] = eaddr.addr[2];\
+                              uip_ethaddr.addr[3] = eaddr.addr[3];\
+                              uip_ethaddr.addr[4] = eaddr.addr[4];\
+                              uip_ethaddr.addr[5] = eaddr.addr[5];} while(0)
+
+/** @} */
+
+
+#endif /* __UIP_ARP_H__ */
+/** @} */
+
diff --git a/lib/lufa/Projects/Webserver/Lib/uip/uipopt.h b/lib/lufa/Projects/Webserver/Lib/uip/uipopt.h
new file mode 100644
index 0000000000..520c03f25e
--- /dev/null
+++ b/lib/lufa/Projects/Webserver/Lib/uip/uipopt.h
@@ -0,0 +1,740 @@
+/**
+ * \addtogroup uip
+ * @{
+ */
+
+/**
+ * \defgroup uipopt Configuration options for uIP
+ * @{
+ *
+ * uIP is configured using the per-project configuration file
+ * "uipopt.h". This file contains all compile-time options for uIP and
+ * should be tweaked to match each specific project. The uIP
+ * distribution contains a documented example "uipopt.h" that can be
+ * copied and modified for each project.
+ */
+
+/**
+ * \file
+ * Configuration options for uIP.
+ * \author Adam Dunkels <adam@dunkels.com>
+ *
+ * This file is used for tweaking various configuration options for
+ * uIP. You should make a copy of this file into one of your project's
+ * directories instead of editing this example "uipopt.h" file that
+ * comes with the uIP distribution.
+ */
+
+/*
+ * Copyright (c) 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.
+ *
+ * This file is part of the uIP TCP/IP stack.
+ *
+ * $Id: uipopt.h,v 1.11 2009/04/10 00:37:48 adamdunkels Exp $
+ *
+ */
+
+#ifndef __UIPOPT_H__
+#define __UIPOPT_H__
+
+#include "Config/AppConfig.h"
+
+#ifndef UIP_LITTLE_ENDIAN
+#define UIP_LITTLE_ENDIAN  3412
+#endif /* UIP_LITTLE_ENDIAN */
+#ifndef UIP_BIG_ENDIAN
+#define UIP_BIG_ENDIAN     1234
+#endif /* UIP_BIG_ENDIAN */
+
+/*------------------------------------------------------------------------------*/
+
+/**
+ * \defgroup uipoptstaticconf Static configuration options
+ * @{
+ *
+ * These configuration options can be used for setting the IP address
+ * settings statically, but only if UIP_FIXEDADDR is set to 1. The
+ * configuration options for a specific node includes IP address,
+ * netmask and default router as well as the Ethernet address. The
+ * netmask, default router and Ethernet address are applicable only
+ * if uIP should be run over Ethernet.
+ *
+ * This options are meaningful only for the IPv4 code.
+ *
+ * All of these should be changed to suit your project.
+ */
+
+/**
+ * Determines if uIP should use a fixed IP address or not.
+ *
+ * If uIP should use a fixed IP address, the settings are set in the
+ * uipopt.h file. If not, the macros uip_sethostaddr(),
+ * uip_setdraddr() and uip_setnetmask() should be used instead.
+ *
+ * \hideinitializer
+ */
+#define UIP_FIXEDADDR    0
+
+/**
+ * Ping IP address assignment.
+ *
+ * uIP uses a "ping" packets for setting its own IP address if this
+ * option is set. If so, uIP will start with an empty IP address and
+ * the destination IP address of the first incoming "ping" (ICMP echo)
+ * packet will be used for setting the hosts IP address.
+ *
+ * \note This works only if UIP_FIXEDADDR is 0.
+ *
+ * \hideinitializer
+ */
+#ifdef UIP_CONF_PINGADDRCONF
+#define UIP_PINGADDRCONF UIP_CONF_PINGADDRCONF
+#else /* UIP_CONF_PINGADDRCONF */
+#define UIP_PINGADDRCONF 0
+#endif /* UIP_CONF_PINGADDRCONF */
+
+
+/**
+ * Specifies if the uIP ARP module should be compiled with a fixed
+ * Ethernet MAC address or not.
+ *
+ * If this configuration option is 0, the macro uip_setethaddr() can
+ * be used to specify the Ethernet address at run-time.
+ *
+ * \hideinitializer
+ */
+#define UIP_FIXEDETHADDR 0
+
+/** @} */
+/*------------------------------------------------------------------------------*/
+/**
+ * \defgroup uipoptip IP configuration options
+ * @{
+ *
+ */
+/**
+ * The IP TTL (time to live) of IP packets sent by uIP.
+ *
+ * This should normally not be changed.
+ */
+#define UIP_TTL         64
+
+/**
+ * The maximum time an IP fragment should wait in the reassembly
+ * buffer before it is dropped.
+ *
+ */
+#define UIP_REASS_MAXAGE 60 /*60s*/
+
+/**
+ * Turn on support for IP packet reassembly.
+ *
+ * uIP supports reassembly of fragmented IP packets. This features
+ * requires an additional amount of RAM to hold the reassembly buffer
+ * and the reassembly code size is approximately 700 bytes.  The
+ * reassembly buffer is of the same size as the uip_buf buffer
+ * (configured by UIP_BUFSIZE).
+ *
+ * \note IP packet reassembly is not heavily tested.
+ *
+ * \hideinitializer
+ */
+#ifdef UIP_CONF_REASSEMBLY
+#define UIP_REASSEMBLY UIP_CONF_REASSEMBLY
+#else /* UIP_CONF_REASSEMBLY */
+#define UIP_REASSEMBLY 0
+#endif /* UIP_CONF_REASSEMBLY */
+/** @} */
+
+/*------------------------------------------------------------------------------*/
+/**
+ * \defgroup uipoptipv6 IPv6 configuration options
+ * @{
+ *
+ */
+
+/** The maximum transmission unit at the IP Layer*/
+#define UIP_LINK_MTU 1280
+
+#ifndef UIP_CONF_IPV6
+/** Do we use IPv6 or not (default: no) */
+#define UIP_CONF_IPV6                 0
+#endif
+
+#ifndef UIP_CONF_IPV6_QUEUE_PKT
+/** Do we do per %neighbor queuing during address resolution (default: no) */
+#define UIP_CONF_IPV6_QUEUE_PKT       0
+#endif
+
+#ifndef UIP_CONF_IPV6_CHECKS
+/** Do we do IPv6 consistency checks (highly recommended, default: yes) */
+#define UIP_CONF_IPV6_CHECKS          1
+#endif
+
+#ifndef UIP_CONF_IPV6_REASSEMBLY
+/** Do we do IPv6 fragmentation (default: no) */
+#define UIP_CONF_IPV6_REASSEMBLY      0
+#endif
+
+#ifndef UIP_CONF_NETIF_MAX_ADDRESSES
+/** Default number of IPv6 addresses associated to the node's interface */
+#define UIP_CONF_NETIF_MAX_ADDRESSES  3
+#endif
+
+#ifndef UIP_CONF_ND6_MAX_PREFIXES
+/** Default number of IPv6 prefixes associated to the node's interface */
+#define UIP_CONF_ND6_MAX_PREFIXES     3
+#endif
+
+#ifndef UIP_CONF_ND6_MAX_NEIGHBORS
+/** Default number of neighbors that can be stored in the %neighbor cache */
+#define UIP_CONF_ND6_MAX_NEIGHBORS    4
+#endif
+
+#ifndef UIP_CONF_ND6_MAX_DEFROUTERS
+/** Minimum number of default routers */
+#define UIP_CONF_ND6_MAX_DEFROUTERS   2
+#endif
+/** @} */
+
+/*------------------------------------------------------------------------------*/
+/**
+ * \defgroup uipoptudp UDP configuration options
+ * @{
+ *
+ * \note The UDP support in uIP is still not entirely complete; there
+ * is no support for sending or receiving broadcast or multicast
+ * packets, but it works well enough to support a number of vital
+ * applications such as DNS queries, though
+ */
+
+/**
+ * Toggles whether UDP support should be compiled in or not.
+ *
+ * \hideinitializer
+ */
+#ifdef UIP_CONF_UDP
+#define UIP_UDP UIP_CONF_UDP
+#else /* UIP_CONF_UDP */
+#define UIP_UDP           1
+#endif /* UIP_CONF_UDP */
+
+/**
+ * Toggles if UDP checksums should be used or not.
+ *
+ * \note Support for UDP checksums is currently not included in uIP,
+ * so this option has no function.
+ *
+ * \hideinitializer
+ */
+#ifdef UIP_CONF_UDP_CHECKSUMS
+#define UIP_UDP_CHECKSUMS UIP_CONF_UDP_CHECKSUMS
+#else
+#define UIP_UDP_CHECKSUMS 0
+#endif
+
+/**
+ * The maximum amount of concurrent UDP connections.
+ *
+ * \hideinitializer
+ */
+#ifdef UIP_CONF_UDP_CONNS
+#define UIP_UDP_CONNS UIP_CONF_UDP_CONNS
+#else /* UIP_CONF_UDP_CONNS */
+#define UIP_UDP_CONNS    10
+#endif /* UIP_CONF_UDP_CONNS */
+
+/**
+ * The name of the function that should be called when UDP datagrams arrive.
+ *
+ * \hideinitializer
+ */
+
+
+/** @} */
+/*------------------------------------------------------------------------------*/
+/**
+ * \defgroup uipopttcp TCP configuration options
+ * @{
+ */
+
+/**
+ * Toggles whether TCP support should be compiled in or not.
+ *
+ * \hideinitializer
+ */
+#ifdef UIP_CONF_TCP
+#define UIP_TCP UIP_CONF_TCP
+#else /* UIP_CONF_TCP */
+#define UIP_TCP           1
+#endif /* UIP_CONF_TCP */
+
+/**
+ * Determines if support for opening connections from uIP should be
+ * compiled in.
+ *
+ * If the applications that are running on top of uIP for this project
+ * do not need to open outgoing TCP connections, this configuration
+ * option can be turned off to reduce the code size of uIP.
+ *
+ * \hideinitializer
+ */
+#ifndef UIP_CONF_ACTIVE_OPEN
+#define UIP_ACTIVE_OPEN 1
+#else /* UIP_CONF_ACTIVE_OPEN */
+#define UIP_ACTIVE_OPEN UIP_CONF_ACTIVE_OPEN
+#endif /* UIP_CONF_ACTIVE_OPEN */
+
+/**
+ * The maximum number of simultaneously open TCP connections.
+ *
+ * Since the TCP connections are statically allocated, turning this
+ * configuration knob down results in less RAM used. Each TCP
+ * connection requires approximately 30 bytes of memory.
+ *
+ * \hideinitializer
+ */
+#ifndef UIP_CONF_MAX_CONNECTIONS
+#define UIP_CONNS       10
+#else /* UIP_CONF_MAX_CONNECTIONS */
+#define UIP_CONNS UIP_CONF_MAX_CONNECTIONS
+#endif /* UIP_CONF_MAX_CONNECTIONS */
+
+
+/**
+ * The maximum number of simultaneously listening TCP ports.
+ *
+ * Each listening TCP port requires 2 bytes of memory.
+ *
+ * \hideinitializer
+ */
+#ifndef UIP_CONF_MAX_LISTENPORTS
+#define UIP_LISTENPORTS 20
+#else /* UIP_CONF_MAX_LISTENPORTS */
+#define UIP_LISTENPORTS UIP_CONF_MAX_LISTENPORTS
+#endif /* UIP_CONF_MAX_LISTENPORTS */
+
+/**
+ * Determines if support for TCP urgent data notification should be
+ * compiled in.
+ *
+ * Urgent data (out-of-band data) is a rarely used TCP feature that
+ * very seldom would be required.
+ *
+ * \hideinitializer
+ */
+#if !defined(UIP_URGDATA)
+#define UIP_URGDATA      0
+#endif
+
+/**
+ * The initial retransmission timeout counted in timer pulses.
+ *
+ * This should not be changed.
+ */
+#if !defined(UIP_RTO)
+#define UIP_RTO         3
+#endif
+
+/**
+ * The maximum number of times a segment should be retransmitted
+ * before the connection should be aborted.
+ *
+ * This should not be changed.
+ */
+#if !defined(UIP_MAXRTX)
+#define UIP_MAXRTX      8
+#endif
+
+/**
+ * The maximum number of times a SYN segment should be retransmitted
+ * before a connection request should be deemed to have been
+ * unsuccessful.
+ *
+ * This should not need to be changed.
+ */
+#if !defined(UIP_MAXSYNRTX)
+#define UIP_MAXSYNRTX      5
+#endif
+
+/**
+ * The TCP maximum segment size.
+ *
+ * This is should not be to set to more than
+ * UIP_BUFSIZE - UIP_LLH_LEN - UIP_TCPIP_HLEN.
+ */
+#ifdef UIP_CONF_TCP_MSS
+#define UIP_TCP_MSS UIP_CONF_TCP_MSS
+#else
+#define UIP_TCP_MSS     (UIP_BUFSIZE - UIP_LLH_LEN - UIP_TCPIP_HLEN)
+#endif
+
+/**
+ * The size of the advertised receiver's window.
+ *
+ * Should be set low (i.e., to the size of the uip_buf buffer) if the
+ * application is slow to process incoming data, or high (32768 bytes)
+ * if the application processes data quickly.
+ *
+ * \hideinitializer
+ */
+#ifndef UIP_CONF_RECEIVE_WINDOW
+#define UIP_RECEIVE_WINDOW UIP_TCP_MSS
+#else
+#define UIP_RECEIVE_WINDOW UIP_CONF_RECEIVE_WINDOW
+#endif
+
+/**
+ * How long a connection should stay in the TIME_WAIT state.
+ *
+ * This configuration option has no real implication, and it should be
+ * left untouched.
+ */
+#define UIP_TIME_WAIT_TIMEOUT 120
+
+
+/** @} */
+/*------------------------------------------------------------------------------*/
+/**
+ * \defgroup uipoptarp ARP configuration options
+ * @{
+ */
+
+/**
+ * The size of the ARP table.
+ *
+ * This option should be set to a larger value if this uIP node will
+ * have many connections from the local network.
+ *
+ * \hideinitializer
+ */
+#ifdef UIP_CONF_ARPTAB_SIZE
+#define UIP_ARPTAB_SIZE UIP_CONF_ARPTAB_SIZE
+#else
+#define UIP_ARPTAB_SIZE 8
+#endif
+
+/**
+ * The maximum age of ARP table entries measured in 10ths of seconds.
+ *
+ * An UIP_ARP_MAXAGE of 120 corresponds to 20 minutes (BSD
+ * default).
+ */
+#define UIP_ARP_MAXAGE 120
+
+
+/** @} */
+
+/*------------------------------------------------------------------------------*/
+
+/**
+ * \defgroup uipoptmac layer 2 options (for ipv6)
+ * @{
+ */
+
+#define UIP_DEFAULT_PREFIX_LEN 64
+
+/** @} */
+
+/*------------------------------------------------------------------------------*/
+
+/**
+ * \defgroup uipoptsics 6lowpan options (for ipv6)
+ * @{
+ */
+/**
+ * Timeout for packet reassembly at the 6lowpan layer
+ * (should be < 60s)
+ */
+#ifdef SICSLOWPAN_CONF_MAXAGE
+#define SICSLOWPAN_REASS_MAXAGE SICSLOWPAN_CONF_MAXAGE
+#else
+#define SICSLOWPAN_REASS_MAXAGE 20
+#endif
+
+/**
+ * Do we compress the IP header or not (default: no)
+ */
+#ifndef SICSLOWPAN_CONF_COMPRESSION
+#define SICSLOWPAN_CONF_COMPRESSION 0
+#endif
+
+/**
+ * If we use IPHC compression, how many address contexts do we support
+ */
+#ifndef SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS
+#define SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS 1
+#endif
+
+/**
+ * Do we support 6lowpan fragmentation
+ */
+#ifndef SICSLOWPAN_CONF_FRAG
+#define SICSLOWPAN_CONF_FRAG  0
+#endif
+
+/** @} */
+
+/*------------------------------------------------------------------------------*/
+
+/**
+ * \defgroup uipoptgeneral General configuration options
+ * @{
+ */
+
+/**
+ * The size of the uIP packet buffer.
+ *
+ * The uIP packet buffer should not be smaller than 60 bytes, and does
+ * not need to be larger than 1514 bytes. Lower size results in lower
+ * TCP throughput, larger size results in higher TCP throughput.
+ *
+ * \hideinitializer
+ */
+#ifndef UIP_CONF_BUFFER_SIZE
+#define UIP_BUFSIZE UIP_LINK_MTU + UIP_LLH_LEN
+#else /* UIP_CONF_BUFFER_SIZE */
+#define UIP_BUFSIZE UIP_CONF_BUFFER_SIZE
+#endif /* UIP_CONF_BUFFER_SIZE */
+
+
+/**
+ * Determines if statistics support should be compiled in.
+ *
+ * The statistics is useful for debugging and to show the user.
+ *
+ * \hideinitializer
+ */
+#ifndef UIP_CONF_STATISTICS
+#define UIP_STATISTICS  0
+#else /* UIP_CONF_STATISTICS */
+#define UIP_STATISTICS UIP_CONF_STATISTICS
+#endif /* UIP_CONF_STATISTICS */
+
+/**
+ * Determines if logging of certain events should be compiled in.
+ *
+ * This is useful mostly for debugging. The function uip_log()
+ * must be implemented to suit the architecture of the project, if
+ * logging is turned on.
+ *
+ * \hideinitializer
+ */
+#ifndef UIP_CONF_LOGGING
+#define UIP_LOGGING     0
+#else /* UIP_CONF_LOGGING */
+#define UIP_LOGGING     UIP_CONF_LOGGING
+#endif /* UIP_CONF_LOGGING */
+
+/**
+ * Broadcast support.
+ *
+ * This flag configures IP broadcast support. This is useful only
+ * together with UDP.
+ *
+ * \hideinitializer
+ *
+ */
+#ifndef UIP_CONF_BROADCAST
+#define UIP_BROADCAST 0
+#else /* UIP_CONF_BROADCAST */
+#define UIP_BROADCAST UIP_CONF_BROADCAST
+#endif /* UIP_CONF_BROADCAST */
+
+/**
+ * Print out a uIP log message.
+ *
+ * This function must be implemented by the module that uses uIP, and
+ * is called by uIP whenever a log message is generated.
+ */
+void uip_log(char *msg);
+
+/**
+ * The link level header length.
+ *
+ * This is the offset into the uip_buf where the IP header can be
+ * found. For Ethernet, this should be set to 14. For SLIP, this
+ * should be set to 0.
+ *
+ * \note we probably won't use this constant for other link layers than
+ * ethernet as they have variable header length (this is due to variable
+ * number and type of address fields and to optional security features)
+ * E.g.: 802.15.4 -> 2 + (1/2*4/8) + 0/5/6/10/14
+ *       802.11 -> 4 + (6*3/4) + 2
+ * \hideinitializer
+ */
+#ifdef UIP_CONF_LLH_LEN
+#define UIP_LLH_LEN UIP_CONF_LLH_LEN
+#else /* UIP_LLH_LEN */
+#define UIP_LLH_LEN     14
+#endif /* UIP_CONF_LLH_LEN */
+
+/** @} */
+/*------------------------------------------------------------------------------*/
+/**
+ * \defgroup uipoptcpu CPU architecture configuration
+ * @{
+ *
+ * The CPU architecture configuration is where the endianess of the
+ * CPU on which uIP is to be run is specified. Most CPUs today are
+ * little endian, and the most notable exception are the Motorolas
+ * which are big endian. The BYTE_ORDER macro should be changed to
+ * reflect the CPU architecture on which uIP is to be run.
+ */
+
+/**
+ * The byte order of the CPU architecture on which uIP is to be run.
+ *
+ * This option can be either UIP_BIG_ENDIAN (Motorola byte order) or
+ * UIP_LITTLE_ENDIAN (Intel byte order).
+ *
+ * \hideinitializer
+ */
+#ifdef UIP_CONF_BYTE_ORDER
+#define UIP_BYTE_ORDER     UIP_CONF_BYTE_ORDER
+#else /* UIP_CONF_BYTE_ORDER */
+#define UIP_BYTE_ORDER     UIP_LITTLE_ENDIAN
+#endif /* UIP_CONF_BYTE_ORDER */
+
+/** @} */
+/*------------------------------------------------------------------------------*/
+
+#include <ff.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "timer.h"
+
+typedef uint8_t u8_t;
+typedef uint16_t u16_t;
+typedef uint32_t u32_t;
+typedef uint32_t uip_stats_t;
+
+/**
+ * \defgroup uipoptapp Application specific configurations
+ * @{
+ *
+ * An uIP application is implemented using a single application
+ * function that is called by uIP whenever a TCP/IP event occurs. The
+ * name of this function must be registered with uIP at compile time
+ * using the UIP_APPCALL definition.
+ *
+ * uIP applications can store the application state within the
+ * uip_conn structure by specifying the type of the application
+ * structure by typedef:ing the type uip_tcp_appstate_t and uip_udp_appstate_t.
+ *
+ * The file containing the definitions must be included in the
+ * uipopt.h file.
+ *
+ * The following example illustrates how this can look.
+ \code
+
+ void httpd_appcall(void);
+ #define UIP_APPCALL     httpd_appcall
+
+ struct httpd_state {
+ u8_t state;
+ u16_t count;
+ char *dataptr;
+ char *script;
+ };
+ typedef struct httpd_state uip_tcp_appstate_t
+ \endcode
+*/
+#define UIP_UDP_APPCALL uIPManagement_UDPCallback
+void UIP_UDP_APPCALL(void);
+
+/**
+ * \var #define UIP_APPCALL
+ *
+ * The name of the application function that uIP should call in
+ * response to TCP/IP events.
+ *
+ */
+#define UIP_APPCALL     uIPManagement_TCPCallback
+void UIP_APPCALL(void);
+
+/**
+ * \var typedef uip_tcp_appstate_t
+ *
+ * The type of the application state that is to be stored in the
+ * uip_conn structure. This usually is typedef:ed to a struct holding
+ * application state information.
+ */
+typedef union
+{
+	struct
+	{
+		uint8_t  CurrentState;
+		uint8_t  NextState;
+
+		char     FileName[MAX_URI_LENGTH];
+		FIL      FileHandle;
+		bool     FileOpen;
+		uint32_t ACKedFilePos;
+		uint16_t SentChunkSize;
+	} HTTPServer;
+
+	struct
+	{
+		uint8_t  CurrentState;
+		uint8_t  NextState;
+
+		uint8_t  IssuedCommand;
+	} TELNETServer;
+} uip_tcp_appstate_t;
+
+/**
+ * \var typedef uip_udp_appstate_t
+ *
+ * The type of the application state that is to be stored in the
+ * uip_conn structure. This usually is typedef:ed to a struct holding
+ * application state information.
+ */
+typedef union
+{
+	struct
+	{
+		uint8_t      CurrentState;
+		struct timer Timeout;
+
+		struct
+		{
+			uint8_t AllocatedIP[4];
+			uint8_t Netmask[4];
+			uint8_t GatewayIP[4];
+			uint8_t ServerIP[4];
+		} DHCPOffer_Data;
+	} DHCPClient;
+} uip_udp_appstate_t;
+/** @} */
+
+#endif /* __UIPOPT_H__ */
+/** @} */
+/** @} */
+