Moved uIP and tcp.c from proto/ to net/

src/Makefile

@@ -132,8 +132,7 @@ DEBUG_TARGETS	+= dbg2.o dbg.o c s
 #
 SRCDIRS		+= core
 SRCDIRS		+= proto
-SRCDIRS		+= net
-SRCDIRS		+= proto/uip
+SRCDIRS		+= net net/uip
 #SRCDIRS		+= image
 SRCDIRS		+= drivers/bus
 SRCDIRS		+= drivers/net

src/net/ipv4.c

@@ -11,7 +11,7 @@
 #include <gpxe/if_ether.h>
 #include <gpxe/pkbuff.h>
 #include <gpxe/netdevice.h>
-#include "../proto/uip/uip.h"
+#include "uip/uip.h"
 
 /** @file
  *

src/net/tcp.c

@@ -0,0 +1,164 @@
+#include <string.h>
+#include <assert.h>
+#include <byteswap.h>
+#include <gpxe/tcp.h>
+#include "uip/uip.h"
+
+/** @file
+ *
+ * TCP protocol
+ *
+ * The gPXE TCP stack is currently implemented on top of the uIP
+ * protocol stack.  This file provides wrappers around uIP so that
+ * higher-level protocol implementations do not need to talk directly
+ * to uIP (which has a somewhat baroque API).
+ *
+ * Basic operation is to create a #tcp_connection structure, call
+ * tcp_connect() and then call run_tcpip() in a loop until the
+ * operation has completed.  The TCP stack will call the various
+ * methods defined in the #tcp_operations structure in order to send
+ * and receive data.
+ *
+ * See hello.c for a trivial example of a TCP protocol using this
+ * API.
+ *
+ */
+
+/**
+ * TCP transmit buffer
+ *
+ * When a tcp_operations::senddata() method is called, it is
+ * guaranteed to be able to use this buffer as temporary space for
+ * constructing the data to be sent.  For example, code such as
+ *
+ * @code
+ *
+ *     static void my_senddata ( struct tcp_connection *conn ) {
+ *         int len;
+ *
+ *         len = snprintf ( tcp_buffer, tcp_buflen, "FETCH %s\r\n", filename );
+ *         tcp_send ( conn, tcp_buffer + already_sent, len - already_sent );
+ *     }
+ *
+ * @endcode
+ *
+ * is allowed, and is probably the best way to deal with
+ * variably-sized data.
+ *
+ * Note that you cannot use this simple mechanism if you want to be
+ * able to construct single data blocks of more than #tcp_buflen
+ * bytes.
+ */
+void *tcp_buffer = uip_buf + ( 40 + UIP_LLH_LEN );
+
+/** Size of #tcp_buffer */
+size_t tcp_buflen = UIP_BUFSIZE - ( 40 + UIP_LLH_LEN );
+
+/**
+ * Open a TCP connection
+ *
+ * @v conn	TCP connection
+ * @ret 0	Success
+ * @ret <0	Failure
+ * 
+ * This sets up a new TCP connection to the remote host specified in
+ * tcp_connection::sin.  The actual SYN packet will not be sent out
+ * until run_tcpip() is called for the first time.
+ *
+ * @todo Use linked lists instead of a static buffer, and thereby
+ *       remove the only potential failure case, giving this function
+ *       a void return type.
+ */
+int tcp_connect ( struct tcp_connection *conn ) {
+	struct uip_conn *uip_conn;
+	u16_t ipaddr[2];
+
+	assert ( conn->sin.sin_addr.s_addr != 0 );
+	assert ( conn->sin.sin_port != 0 );
+	assert ( conn->tcp_op != NULL );
+	assert ( sizeof ( uip_conn->appstate ) == sizeof ( conn ) );
+
+	* ( ( uint32_t * ) ipaddr ) = conn->sin.sin_addr.s_addr;
+	uip_conn = uip_connect ( ipaddr, conn->sin.sin_port );
+	if ( ! uip_conn )
+		return -1;
+
+	*( ( void ** ) uip_conn->appstate ) = conn;
+	return 0;
+}
+
+/**
+ * Send data via a TCP connection
+ *
+ * @v conn	TCP connection
+ * @v data	Data to send
+ * @v len	Length of data
+ *
+ * Data will be automatically limited to the current TCP window size.
+ *
+ * If retransmission is required, the connection's
+ * tcp_operations::senddata() method will be called again in order to
+ * regenerate the data.
+ */
+void tcp_send ( struct tcp_connection *conn __unused,
+		const void *data, size_t len ) {
+
+	assert ( conn = *( ( void ** ) uip_conn->appstate ) );
+
+	if ( len > tcp_buflen )
+		len = tcp_buflen;
+	memmove ( tcp_buffer, data, len );
+
+	uip_send ( tcp_buffer, len );
+}
+
+/**
+ * Close a TCP connection
+ *
+ * @v conn	TCP connection
+ */
+void tcp_close ( struct tcp_connection *conn __unused ) {
+	assert ( conn = *( ( void ** ) uip_conn->appstate ) );
+	uip_close();
+}
+
+/**
+ * uIP TCP application call interface
+ *
+ * This is the entry point of gPXE from the point of view of the uIP
+ * protocol stack.  This function calls the appropriate methods from
+ * the connection's @tcp_operations table in order to process received
+ * data, transmit new data etc.
+ */
+void uip_tcp_appcall ( void ) {
+	struct tcp_connection *conn = *( ( void ** ) uip_conn->appstate );
+	struct tcp_operations *op = conn->tcp_op;
+
+	assert ( conn->tcp_op->closed != NULL );
+	assert ( conn->tcp_op->connected != NULL );
+	assert ( conn->tcp_op->acked != NULL );
+	assert ( conn->tcp_op->newdata != NULL );
+	assert ( conn->tcp_op->senddata != NULL );
+
+	if ( uip_aborted() && op->aborted ) /* optional method */
+		op->aborted ( conn );
+	if ( uip_timedout() && op->timedout ) /* optional method */
+		op->timedout ( conn );
+	if ( uip_closed() && op->closed ) /* optional method */
+		op->closed ( conn );
+	if ( uip_connected() )
+		op->connected ( conn );
+	if ( uip_acked() )
+		op->acked ( conn, uip_conn->len );
+	if ( uip_newdata() )
+		op->newdata ( conn, ( void * ) uip_appdata, uip_len );
+	if ( uip_rexmit() || uip_newdata() || uip_acked() ||
+	     uip_connected() || uip_poll() )
+		op->senddata ( conn );
+}
+
+/* Present here to allow everything to link.  Will go into separate
+ * udp.c file
+ */
+void uip_udp_appcall ( void ) {
+}

src/net/uip/uip_arch.c

@@ -0,0 +1,83 @@
+#include <stdint.h>
+#include <byteswap.h>
+#include "uip_arch.h"
+#include "uip.h"
+
+volatile u8_t uip_acc32[4];
+
+void uip_add32 ( u8_t *op32, u16_t op16 ) {
+	* ( ( uint32_t * ) uip_acc32 ) =
+		htonl ( ntohl ( *( ( uint32_t * ) op32 ) )  + op16 );
+}
+
+#define BUF ((uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
+#define IP_PROTO_TCP    6
+
+u16_t uip_chksum(u16_t *sdata, u16_t len) {
+  u16_t acc;
+  
+  for(acc = 0; len > 1; len -= 2) {
+    acc += *sdata;
+    if(acc < *sdata) {
+      /* Overflow, so we add the carry to acc (i.e., increase by
+         one). */
+      ++acc;
+    }
+    ++sdata;
+  }
+
+  /* add up any odd byte */
+  if(len == 1) {
+    acc += htons(((u16_t)(*(u8_t *)sdata)) << 8);
+    if(acc < htons(((u16_t)(*(u8_t *)sdata)) << 8)) {
+      ++acc;
+    }
+  }
+
+  return acc;
+}
+
+u16_t uip_ipchksum(void) {
+  return uip_chksum((u16_t *)&uip_buf[UIP_LLH_LEN], 20);
+}
+
+u16_t uip_tcpchksum(void) {
+  u16_t hsum, sum;
+
+  
+  /* Compute the checksum of the TCP header. */
+  hsum = uip_chksum((u16_t *)&uip_buf[20 + UIP_LLH_LEN], 20);
+
+  /* Compute the checksum of the data in the TCP packet and add it to
+     the TCP header checksum. */
+  sum = uip_chksum((u16_t *)uip_appdata,
+		   (u16_t)(((((u16_t)(BUF->len[0]) << 8) + BUF->len[1]) - 40)));
+
+  if((sum += hsum) < hsum) {
+    ++sum;
+  }
+  
+  if((sum += BUF->srcipaddr[0]) < BUF->srcipaddr[0]) {
+    ++sum;
+  }
+  if((sum += BUF->srcipaddr[1]) < BUF->srcipaddr[1]) {
+    ++sum;
+  }
+  if((sum += BUF->destipaddr[0]) < BUF->destipaddr[0]) {
+    ++sum;
+  }
+  if((sum += BUF->destipaddr[1]) < BUF->destipaddr[1]) {
+    ++sum;
+  }
+  if((sum += (u16_t)htons((u16_t)IP_PROTO_TCP)) < (u16_t)htons((u16_t)IP_PROTO_TCP)) {
+    ++sum;
+  }
+
+  hsum = (u16_t)htons((((u16_t)(BUF->len[0]) << 8) + BUF->len[1]) - 20);
+  
+  if((sum += hsum) < hsum) {
+    ++sum;
+  }
+  
+  return sum;
+}

src/net/uip/uip_arch.h

@@ -0,0 +1,130 @@
+/**
+ * \defgroup uiparch Architecture specific uIP functions
+ * @{
+ *
+ * The functions in the architecture specific module implement the IP
+ * check sum and 32-bit additions.
+ *
+ * The IP checksum calculation is the most computationally expensive
+ * operation in the TCP/IP stack and it therefore pays off to
+ * implement this in efficient assembler. The purpose of the uip-arch
+ * module is to let the checksum functions to be implemented in
+ * architecture specific assembler.
+ *
+ */
+
+/**
+ * \file
+ * Declarations of architecture specific functions.
+ * \author Adam Dunkels <adam@dunkels.com>
+ */
+
+/*
+ * Copyright (c) 2001, 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.
+ *
+ * $Id$
+ *
+ */
+
+#ifndef __UIP_ARCH_H__
+#define __UIP_ARCH_H__
+
+#include "uip.h"
+
+/**
+ * Carry out a 32-bit addition.
+ *
+ * Because not all architectures for which uIP is intended has native
+ * 32-bit arithmetic, uIP uses an external C function for doing the
+ * required 32-bit additions in the TCP protocol processing. This
+ * function should add the two arguments and place the result in the
+ * global variable uip_acc32.
+ *
+ * \note The 32-bit integer pointed to by the op32 parameter and the
+ * result in the uip_acc32 variable are in network byte order (big
+ * endian).
+ *
+ * \param op32 A pointer to a 4-byte array representing a 32-bit
+ * integer in network byte order (big endian).
+ *
+ * \param op16 A 16-bit integer in host byte order.
+ */
+void uip_add32(u8_t *op32, u16_t op16);
+
+/**
+ * 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.
+ *
+ * \note This function is not called in the current version of uIP,
+ * but future versions might make use of it.
+ *
+ * \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.
+ *
+ * \note The uip_appdata pointer that points to the packet data may
+ * point anywhere in memory, so it is not possible to simply calculate
+ * the Internet checksum of the contents of the uip_buf buffer.
+ *
+ * \return The TCP checksum of the TCP segment in uip_buf and pointed
+ * to by uip_appdata.
+ */
+u16_t uip_tcpchksum(void);
+
+/** @} */
+
+#endif /* __UIP_ARCH_H__ */

src/net/uip/uipopt.h

@@ -0,0 +1,572 @@
+/**
+ * \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.
+ *
+ * $Id$
+ *
+ */
+
+#ifndef __UIPOPT_H__
+#define __UIPOPT_H__
+
+/*------------------------------------------------------------------------------*/
+/**
+ * \defgroup uipopttypedef uIP type definitions
+ * @{
+ */
+
+/**
+ * The 8-bit unsigned data type.
+ *
+ * This may have to be tweaked for your particular compiler. "unsigned
+ * char" works for most compilers.
+ */
+typedef unsigned char u8_t;
+
+/**
+ * The 16-bit unsigned data type.
+ *
+ * This may have to be tweaked for your particular compiler. "unsigned
+ * short" works for most compilers.
+ */
+typedef unsigned short u16_t;
+
+/**
+ * The statistics data type.
+ *
+ * This datatype determines how high the statistics counters are able
+ * to count.
+ */
+typedef unsigned short uip_stats_t;
+
+/** @} */
+
+/*------------------------------------------------------------------------------*/
+
+/**
+ * \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 appliciable only
+ * if uIP should be run over Ethernet.
+ *
+ * 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 asignment.
+ *
+ * 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
+ */
+#define UIP_PINGADDRCONF 0
+
+#define UIP_IPADDR0     0   /**< The first octet of the IP address of
+			       this uIP node, if UIP_FIXEDADDR is
+			       1. \hideinitializer */
+#define UIP_IPADDR1     0   /**< The second octet of the IP address of
+			       this uIP node, if UIP_FIXEDADDR is
+			       1. \hideinitializer */
+#define UIP_IPADDR2     0   /**< The third octet of the IP address of
+			       this uIP node, if UIP_FIXEDADDR is
+			       1. \hideinitializer */
+#define UIP_IPADDR3     0   /**< The fourth octet of the IP address of
+			       this uIP node, if UIP_FIXEDADDR is
+			       1. \hideinitializer */
+
+#define UIP_NETMASK0    0   /**< The first octet of the netmask of
+			       this uIP node, if UIP_FIXEDADDR is
+			       1. \hideinitializer */
+#define UIP_NETMASK1    0   /**< The second octet of the netmask of
+			       this uIP node, if UIP_FIXEDADDR is
+			       1. \hideinitializer */
+#define UIP_NETMASK2    0   /**< The third octet of the netmask of
+			       this uIP node, if UIP_FIXEDADDR is
+			       1. \hideinitializer */
+#define UIP_NETMASK3    0   /**< The fourth octet of the netmask of
+			       this uIP node, if UIP_FIXEDADDR is
+			       1. \hideinitializer */
+
+#define UIP_DRIPADDR0   0   /**< The first octet of the IP address of
+			       the default router, if UIP_FIXEDADDR is
+			       1. \hideinitializer */
+#define UIP_DRIPADDR1   0   /**< The second octet of the IP address of
+			       the default router, if UIP_FIXEDADDR is
+			       1. \hideinitializer */
+#define UIP_DRIPADDR2   0   /**< The third octet of the IP address of
+			       the default router, if UIP_FIXEDADDR is
+			       1. \hideinitializer */
+#define UIP_DRIPADDR3   0   /**< The fourth octet of the IP address of
+			       the default router, if UIP_FIXEDADDR is
+			       1. \hideinitializer */
+
+/**
+ * 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
+
+#define UIP_ETHADDR0    0x00  /**< The first octet of the Ethernet
+				 address if UIP_FIXEDETHADDR is
+				 1. \hideinitializer */
+#define UIP_ETHADDR1    0xbd  /**< The second octet of the Ethernet
+				 address if UIP_FIXEDETHADDR is
+				 1. \hideinitializer */
+#define UIP_ETHADDR2    0x3b  /**< The third octet of the Ethernet
+				 address if UIP_FIXEDETHADDR is
+				 1. \hideinitializer */
+#define UIP_ETHADDR3    0x33  /**< The fourth octet of the Ethernet
+				 address if UIP_FIXEDETHADDR is
+				 1. \hideinitializer */
+#define UIP_ETHADDR4    0x05  /**< The fifth octet of the Ethernet
+				 address if UIP_FIXEDETHADDR is
+				 1. \hideinitializer */
+#define UIP_ETHADDR5    0x71  /**< The sixth octet of the Ethernet
+				 address if UIP_FIXEDETHADDR is
+				 1. \hideinitializer */
+
+/** @} */
+/*------------------------------------------------------------------------------*/
+/**
+ * \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         255
+
+/**
+ * Turn on support for IP packet reassembly.
+ *
+ * uIP supports reassembly of fragmented IP packets. This features
+ * requires an additonal 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
+ */
+#define UIP_REASSEMBLY 0
+
+/**
+ * The maximum time an IP fragment should wait in the reassembly
+ * buffer before it is dropped.
+ *
+ */
+#define UIP_REASS_MAXAGE 40
+
+/** @} */
+
+/*------------------------------------------------------------------------------*/
+/**
+ * \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 wether UDP support should be compiled in or not.
+ *
+ * \hideinitializer
+ */
+#define UIP_UDP           1
+
+/**
+ * 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
+ */
+#define UIP_UDP_CHECKSUMS 0
+
+/**
+ * The maximum amount of concurrent UDP connections.
+ *
+ * \hideinitializer
+ */
+#define UIP_UDP_CONNS    10
+
+/**
+ * The name of the function that should be called when UDP datagrams arrive.
+ *
+ * \hideinitializer
+ */
+extern void uip_udp_appcall ( void );
+#define UIP_UDP_APPCALL  uip_udp_appcall
+
+/** @} */
+/*------------------------------------------------------------------------------*/
+/**
+ * \defgroup uipopttcp TCP configuration options
+ * @{
+ */
+
+/**
+ * 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 configration
+ * option can be turned off to reduce the code size of uIP.
+ *
+ * \hideinitializer
+ */
+#define UIP_ACTIVE_OPEN 1
+
+/**
+ * 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 approximatly 30 bytes of memory.
+ *
+ * \hideinitializer
+ */
+#define UIP_CONNS       10
+
+/**
+ * The maximum number of simultaneously listening TCP ports.
+ *
+ * Each listening TCP port requires 2 bytes of memory.
+ *
+ * \hideinitializer
+ */
+#define UIP_LISTENPORTS 10
+
+/**
+ * The size of the advertised receiver's window.
+ *
+ * Should be set low (i.e., to the size of the uip_buf buffer) is the
+ * application is slow to process incoming data, or high (32768 bytes)
+ * if the application processes data quickly.
+ *
+ * \hideinitializer
+ */
+#define UIP_RECEIVE_WINDOW   32768
+
+/**
+ * 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
+ */
+#define UIP_URGDATA      1
+
+/**
+ * The initial retransmission timeout counted in timer pulses.
+ *
+ * This should not be changed.
+ */
+#define UIP_RTO         3
+
+/**
+ * The maximum number of times a segment should be retransmitted
+ * before the connection should be aborted.
+ *
+ * This should not be changed.
+ */
+#define UIP_MAXRTX      8
+
+/**
+ * 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.
+ */
+#define UIP_MAXSYNRTX      3
+
+/**
+ * The TCP maximum segment size.
+ *
+ * This is should not be to set to more than UIP_BUFSIZE - UIP_LLH_LEN - 40.
+ */
+#define UIP_TCP_MSS     (UIP_BUFSIZE - UIP_LLH_LEN - 40)
+
+/**
+ * How long a connection should stay in the TIME_WAIT state.
+ *
+ * This configiration 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
+ */
+#define UIP_ARPTAB_SIZE 8
+
+/**
+ * The maxium 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 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 1500 bytes. Lower size results in lower
+ * TCP throughput, larger size results in higher TCP throughput.
+ *
+ * \hideinitializer
+ */
+#define UIP_BUFSIZE     1500
+
+
+/**
+ * Determines if statistics support should be compiled in.
+ *
+ * The statistics is useful for debugging and to show the user.
+ *
+ * \hideinitializer
+ */
+#define UIP_STATISTICS  0
+
+/**
+ * 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
+ */
+#define UIP_LOGGING     0
+
+/**
+ * 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.
+ *
+ * \hideinitializer
+ */
+#define UIP_LLH_LEN     0
+
+
+/** @} */
+/*------------------------------------------------------------------------------*/
+/**
+ * \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.
+ */
+#ifndef LITTLE_ENDIAN
+#define LITTLE_ENDIAN  3412
+#endif /* LITTLE_ENDIAN */
+#ifndef BIG_ENDIAN
+#define BIG_ENDIAN     1234
+#endif /* BIGE_ENDIAN */
+
+/**
+ * The byte order of the CPU architecture on which uIP is to be run.
+ *
+ * This option can be either BIG_ENDIAN (Motorola byte order) or
+ * LITTLE_ENDIAN (Intel byte order).
+ *
+ * \hideinitializer
+ */
+#ifndef BYTE_ORDER
+#define BYTE_ORDER     LITTLE_ENDIAN
+#endif /* BYTE_ORDER */
+
+/** @} */
+/*------------------------------------------------------------------------------*/
+
+/**
+ * \defgroup uipoptapp Appication 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 size of the application
+ * structure with the UIP_APPSTATE_SIZE macro.
+ *
+ * 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;
+};
+#define UIP_APPSTATE_SIZE (sizeof(struct httpd_state))
+ \endcode
+ */
+
+/**
+ * \var #define UIP_APPCALL
+ *
+ * The name of the application function that uIP should call in
+ * response to TCP/IP events.
+ *
+ */
+extern void uip_tcp_appcall ( void );
+#define UIP_APPCALL uip_tcp_appcall
+
+/**
+ * \var #define UIP_APPSTATE_SIZE
+ *
+ * The size of the application state that is to be stored in the
+ * uip_conn structure.
+ */
+#define UIP_APPSTATE_SIZE sizeof ( void * )
+/** @} */
+
+/* Include the header file for the application program that should be
+   used. If you don't use the example web server, you should change
+   this. */
+//#include "httpd.h"
+
+#warning "Remove this static IP address hack"
+#undef UIP_FIXEDADDR
+#undef UIP_IPADDR0
+#undef UIP_IPADDR1
+#undef UIP_IPADDR2
+#undef UIP_IPADDR3
+#define UIP_FIXEDADDR 1
+#define UIP_IPADDR0 10
+#define UIP_IPADDR1 254
+#define UIP_IPADDR2 254
+#define UIP_IPADDR3 1
+
+#endif /* __UIPOPT_H__ */