/Modules/CommSerial/ETH01A/SW/STM32F107_ETH_uIP/Utilities/uip/uip.h
0,0 → 1,1062
/**
* \addtogroup uip
* @{
*/
 
/**
* \file
* Header file for the uIP TCP/IP stack.
* \author Adam Dunkels <adam@dunkels.com>
*
* 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 1.36.2.7 2003/10/07 13:47:51 adam Exp $
*
*/
 
#ifndef __UIP_H__
#define __UIP_H__
 
#include "uipopt.h"
 
/*-----------------------------------------------------------------------------------*/
/* 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.
*
* \param addr A pointer to a 4-byte representation of the IP address.
*
* \hideinitializer
*/
#define uip_sethostaddr(addr) do { uip_hostaddr[0] = addr[0]; \
uip_hostaddr[1] = addr[1]; } while(0)
 
/**
* 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.
*
* \param addr A pointer to a 4-byte array that will be filled in with
* the currently configured IP address.
*
* \hideinitializer
*/
#define uip_gethostaddr(addr) do { addr[0] = uip_hostaddr[0]; \
addr[1] = uip_hostaddr[1]; } while(0)
 
/** @} */
 
/**
* \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 initilize the uIP
* TCP/IP stack.
*/
void uip_init(void);
 
/** @} */
 
/**
* \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 conneciton, 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 ususal 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
*/
#define uip_periodic(conn) do { uip_conn = &uip_conns[conn]; \
uip_process(UIP_TIMER); } while (0)
 
/**
* 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)
 
#if UIP_UDP
/**
* Periodic processing for a UDP connection identified by its number.
*
* This function is essentially the same as uip_prerioic(), 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 */
 
/**
* 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);
hwsend(&uip_buf[UIP_LLH_LEN], 40);
hwsend(uip_appdata, uip_len - 40 - UIP_LLH_LEN);
}
\endcode
*/
extern u8_t uip_buf[UIP_BUFSIZE+2]; /*_RB_ __attribute__ ((aligned (4)));*/
 
/** @} */
 
/*-----------------------------------------------------------------------------------*/
/* 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 specied 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 avaliable 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 convertion using HTONS() or htons() is necessary.
*
\code
u16_t ipaddr[2];
 
uip_ipaddr(ipaddr, 192,168,1,2);
uip_connect(ipaddr, HTONS(80));
\endcode
*
* \param ripaddr A pointer to a 4-byte array representing the IP
* address of the remote hot.
*
* \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(u16_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
* funcion 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
*/
#define uip_send(data, len) do { uip_sappdata = (data); uip_slen = (len);} while(0)
 
/**
* The length of any incoming data that is currently avaliable (if avaliable)
* 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
*/
#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 occured 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 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
* avaliable 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 maxium segment size (MSS) of the current
* connection.
*
* \hideinitializer
*/
#define uip_initialmss() (uip_conn->initialmss)
 
/**
* Get the current maxium segment size that can be sent on the current
* connection.
*
* The current maxiumum 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.
*
* \param ripaddr A pointer to a 4-byte structure representing 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(u16_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
 
/**
* 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_slen = (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.
*/
 
/**
* Pack an IP address into a 4-byte array which is used by uIP to
* represent IP addresses.
*
* Example:
\code
u16_t ipaddr[2];
 
uip_ipaddr(&ipaddr, 192,168,1,2);
\endcode
*
* \param addr A pointer to a 4-byte array that will be filled in with
* the IP addres.
* \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)[0] = HTONS(((addr0) << 8) | (addr1)); \
(addr)[1] = HTONS(((addr2) << 8) | (addr3)); \
} while(0)
 
/**
* 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 BYTE_ORDER == BIG_ENDIAN
# define HTONS(n) (n)
# else /* BYTE_ORDER == BIG_ENDIAN */
# define HTONS(n) ((((u16_t)((n) & 0xff)) << 8) | (((n) & 0xff00) >> 8))
# endif /* BYTE_ORDER == BIG_ENDIAN */
#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 */
 
/** @} */
 
/**
* 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 volatile u8_t *uip_appdata;
extern volatile u8_t *uip_sappdata;
 
#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 volatile u8_t *uip_urgdata;
#endif /* UIP_URGDATA > 0 */
 
 
/* u[8|16]_t uip_len:
*
* When the application is called, uip_len contains the length of any
* new data that has been received from the remote host. The
* application should set this variable to the size of any data that
* the application wishes to send. When the network device driver
* output function is called, uip_len should contain the length of the
* outgoing packet.
*/
extern u16_t uip_len, uip_slen;
 
#if UIP_URGDATA > 0
extern u8_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 whos purpose
* is to let the application store application-specific state (e.g.,
* file pointers) for the connection. The size of this field is
* configured in the "uipopt.h" header file.
*/
struct uip_conn {
u16_t ripaddr[2]; /**< 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. */
u8_t appstate[UIP_APPSTATE_SIZE];
};
 
 
/* Pointer to the current connection. */
extern struct uip_conn *uip_conn;
/* The array containing all uIP connections. */
extern struct uip_conn uip_conns[UIP_CONNS];
/**
* \addtogroup uiparch
* @{
*/
 
/**
* 4-byte array used for the 32-bit sequence number calculations.
*/
extern volatile u8_t uip_acc32[4];
 
/** @} */
 
 
#if UIP_UDP
/**
* Representation of a uIP UDP connection.
*/
struct uip_udp_conn {
u16_t ripaddr[2]; /**< 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. */
};
 
extern struct uip_udp_conn *uip_udp_conn;
extern struct uip_udp_conn uip_udp_conns[UIP_UDP_CONNS];
#endif /* UIP_UDP */
 
/**
* The structure holding the TCP/IP statistics that are gathered if
* UIP_STATISTICS is set to 1.
*
*/
struct uip_stats {
struct {
uip_stats_t drop; /**< Number of dropped packets at the IP
layer. */
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 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 drop; /**< Number of dropped ICMP packets. */
uip_stats_t recv; /**< Number of received ICMP packets. */
uip_stats_t sent; /**< Number of sent ICMP packets. */
uip_stats_t typeerr; /**< Number of ICMP packets with a wrong
type. */
} icmp; /**< ICMP statistics. */
struct {
uip_stats_t drop; /**< Number of dropped TCP segments. */
uip_stats_t recv; /**< Number of recived TCP segments. */
uip_stats_t sent; /**< Number of sent 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 recevied 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 avaliable. */
uip_stats_t synrst; /**< Number of SYNs for closed ports,
triggering a RST. */
} tcp; /**< TCP statistics. */
};
 
/**
* The uIP TCP/IP statistics.
*
* This is the variable in which the uIP TCP/IP statistics are gathered.
*/
extern struct uip_stats uip_stat;
 
 
/*-----------------------------------------------------------------------------------*/
/* 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
* infomation.
*/
extern volatile u8_t uip_flags;
 
/* The following flags may be set in the global variable uip_flags
before calling the application callback. The UIP_ACKDATA and
UIP_NEWDATA flags may both be set at the same time, whereas the
others are mutualy exclusive. Note that these flags should *NOT* be
accessed directly, but 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. */
 
 
/* uip_process(flag):
*
* The actual uIP function which does all the work.
*/
void uip_process(u8_t flag);
 
void udp_appcall(void);
 
/* 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. */
 
#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. */
#if UIP_UDP
#define UIP_UDP_TIMER 3
#endif /* UIP_UDP */
 
/* The TCP states used in the uip_conn->tcpstateflags. */
#define CLOSED 0
#define SYN_RCVD 1
#define SYN_SENT 2
#define ESTABLISHED 3
#define FIN_WAIT_1 4
#define FIN_WAIT_2 5
#define CLOSING 6
#define TIME_WAIT 7
#define LAST_ACK 8
#define TS_MASK 15
 
#define UIP_STOPPED 16
 
#define UIP_TCPIP_HLEN 40
 
/* The TCP and IP headers. */
typedef struct {
/* IP header. */
u8_t vhl,
tos,
len[2],
ipid[2],
ipoffset[2],
ttl,
proto;
u16_t ipchksum;
u16_t srcipaddr[2],
destipaddr[2];
 
/* 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];
} uip_tcpip_hdr;
 
/* The ICMP and IP headers. */
typedef struct {
/* IP header. */
u8_t vhl,
tos,
len[2],
ipid[2],
ipoffset[2],
ttl,
proto;
u16_t ipchksum;
u16_t srcipaddr[2],
destipaddr[2];
/* ICMP (echo) header. */
u8_t type, icode;
u16_t icmpchksum;
u16_t id, seqno;
} uip_icmpip_hdr;
 
 
/* The UDP and IP headers. */
typedef struct {
/* IP header. */
u8_t vhl,
tos,
len[2],
ipid[2],
ipoffset[2],
ttl,
proto;
u16_t ipchksum;
u16_t srcipaddr[2],
destipaddr[2];
 
/* UDP header. */
u16_t srcport,
destport;
u16_t udplen;
u16_t udpchksum;
} uip_udpip_hdr;
 
#define UIP_PROTO_ICMP 1
#define UIP_PROTO_TCP 6
#define UIP_PROTO_UDP 17
 
#if UIP_FIXEDADDR
extern const u16_t uip_hostaddr[2];
#else /* UIP_FIXEDADDR */
extern u16_t uip_hostaddr[2];
#endif /* UIP_FIXEDADDR */
 
#endif /* __UIP_H__ */
 
 
/** @} */