ports/fuchsia/include/lwipopts.h - third_party/lwip - Git at Google

 /*
  * Copyright (c) 2001-2003 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. 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 lwIP TCP/IP stack.
  *
  * Author: Adam Dunkels <adam@sics.se>
  *
  */
 #ifndef LWIP_LWIPOPTS_H
 #define LWIP_LWIPOPTS_H

 #include "lwip/arch.h"

 #define LWIP_NETIF_LOOPBACK             1
 #define LWIP_LOOPBACK_MAX_PBUFS         20

 #define LWIP_RANDOMIZE_INITIAL_LOCAL_PORTS 1

 #define LWIP_IPV4          1
 #define LWIP_IPV6          1

 #define LWIP_COMPAT_SOCKETS 0

 #define LWIP_DBG_MIN_LEVEL 0

 #define TAPIF_DEBUG      LWIP_DBG_OFF
 #define TUNIF_DEBUG      LWIP_DBG_OFF
 #define UNIXIF_DEBUG     LWIP_DBG_OFF
 #define DELIF_DEBUG      LWIP_DBG_OFF
 #define SIO_FIFO_DEBUG   LWIP_DBG_OFF
 #define TCPDUMP_DEBUG    LWIP_DBG_OFF

 #define SLIP_DEBUG       LWIP_DBG_OFF
 #define PPP_DEBUG        LWIP_DBG_OFF
 #define MEM_DEBUG        LWIP_DBG_OFF
 #define MEMP_DEBUG       LWIP_DBG_OFF
 #define PBUF_DEBUG       LWIP_DBG_OFF
 #define API_LIB_DEBUG    LWIP_DBG_OFF
 #define API_MSG_DEBUG    LWIP_DBG_OFF
 #define TCPIP_DEBUG      LWIP_DBG_OFF
 #define NETIF_DEBUG      LWIP_DBG_OFF
 #define SOCKETS_DEBUG    LWIP_DBG_OFF
 #define DEMO_DEBUG       LWIP_DBG_OFF
 #define IP_DEBUG         LWIP_DBG_OFF
 #define IP_REASS_DEBUG   LWIP_DBG_OFF
 #define RAW_DEBUG        LWIP_DBG_OFF
 #define ICMP_DEBUG       LWIP_DBG_OFF
 #define UDP_DEBUG        LWIP_DBG_OFF
 #define TCP_DEBUG        LWIP_DBG_OFF
 #define TCP_INPUT_DEBUG  LWIP_DBG_OFF
 #define TCP_OUTPUT_DEBUG LWIP_DBG_OFF
 #define TCP_RTO_DEBUG    LWIP_DBG_OFF
 #define TCP_CWND_DEBUG   LWIP_DBG_OFF
 #define TCP_WND_DEBUG    LWIP_DBG_OFF
 #define TCP_FR_DEBUG     LWIP_DBG_OFF
 #define TCP_QLEN_DEBUG   LWIP_DBG_OFF
 #define TCP_RST_DEBUG    LWIP_DBG_OFF

 extern unsigned char lwip_debug_flags;
 #define LWIP_DBG_TYPES_ON lwip_debug_flags

 #define NO_SYS                     0
 #define LWIP_SOCKET                (NO_SYS==0)
 #define LWIP_NETCONN               (NO_SYS==0)
 #define SO_REUSE                   1
 #define IP_SOF_BROADCAST_RECV      1
 #define IP_SOF_BROADCAST           1
 #define SO_REUSE_RXTOALL           1

 /* ---------- Memory options ---------- */
 /* MEM_ALIGNMENT: should be set to the alignment of the CPU for which
    lwIP is compiled. 4 byte alignment -> define MEM_ALIGNMENT to 4, 2
    byte alignment -> define MEM_ALIGNMENT to 2. */
 /* MSVC port: intel processors don't need 4-byte alignment,
    but are faster that way! */
 #define MEM_ALIGNMENT           4

 /* MEM_SIZE: the size of the heap memory. If the application will send
 a lot of data that needs to be copied, this should be set high. */
 #define MEM_SIZE                1000000

 /* MEMP_NUM_PBUF: the number of memp struct pbufs. If the application
    sends a lot of data out of ROM (or other static memory), this
    should be set high. */
 #define MEMP_NUM_PBUF           3600
 /* MEMP_NUM_RAW_PCB: the number of UDP protocol control blocks. One
    per active RAW "connection". */
 #define MEMP_NUM_RAW_PCB        3
 /* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
    per active UDP "connection". */
 #define MEMP_NUM_UDP_PCB        64
 /* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP
    connections. */
 #define MEMP_NUM_TCP_PCB        64
 /* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP
    connections. */
 #define MEMP_NUM_TCP_PCB_LISTEN 64
 /* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP
    segments. */
 #define MEMP_NUM_TCP_SEG        720
 /* MEMP_NUM_SYS_TIMEOUT: the number of simulateously active
    timeouts. */
 #define MEMP_NUM_SYS_TIMEOUT    120

 /* The following four are used only with the sequential API and can be
    set to 0 if the application only will use the raw API. */
 /* MEMP_NUM_NETBUF: the number of struct netbufs. */
 #define MEMP_NUM_NETBUF         2
 /* MEMP_NUM_NETCONN: the number of struct netconns. */
 #define MEMP_NUM_NETCONN        100
 /* MEMP_NUM_TCPIP_MSG_*: the number of struct tcpip_msg, which is used
    for sequential API communication and incoming packets. Used in
    src/api/tcpip.c. */
 #define MEMP_NUM_TCPIP_MSG_API   120
 #define MEMP_NUM_TCPIP_MSG_INPKT 120

 /* ---------- Pbuf options ---------- */
 /* PBUF_POOL_SIZE: the number of buffers in the pbuf pool. */
 #define PBUF_POOL_SIZE          3600

 /* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. */
 #define PBUF_POOL_BUFSIZE       128

 /* PBUF_LINK_HLEN: the number of bytes that should be allocated for a
    link level header. */
 #define PBUF_LINK_HLEN          16

 /** SYS_LIGHTWEIGHT_PROT
  * define SYS_LIGHTWEIGHT_PROT in lwipopts.h if you want inter-task protection
  * for certain critical regions during buffer allocation, deallocation and memory
  * allocation and deallocation.
  */
 #define SYS_LIGHTWEIGHT_PROT    1

 #define LWIP_TCPIP_TIMEOUT      1

 /* ---------- TCP options ---------- */
 #define LWIP_TCP                1
 #define TCP_TTL                 255

 #define TCP_LISTEN_BACKLOG      1

 /* Controls if TCP should queue segments that arrive out of
    order. Define to 0 if your device is low on memory. */
 #define TCP_QUEUE_OOSEQ         1

 /* TCP Maximum segment size. */
 #define TCP_MSS                 1460

 /* TCP sender buffer space (bytes). */
 #define TCP_SND_BUF             (TCP_MSS * 42)

 /* TCP sender buffer space (pbufs). This must be at least = 2 *
    TCP_SND_BUF/TCP_MSS for things to work. */
 #define TCP_SND_QUEUELEN        (16 * TCP_SND_BUF/TCP_MSS)

 /* TCP writable space (bytes). This must be less than or equal
    to TCP_SND_BUF. It is the amount of space which must be
    available in the tcp snd_buf for select to return writable */
 #define TCP_SNDLOWAT            (TCP_SND_BUF/2)

 /* TCP receive window. */
 #define TCP_WND                 TCP_SND_BUF

 /* Maximum number of retransmissions of data segments. */
 #define TCP_MAXRTX              12

 /* Maximum number of retransmissions of SYN segments. */
 #define TCP_SYNMAXRTX           4

 /* ---------- ARP options ---------- */
 #define LWIP_ARP                1
 #define ARP_TABLE_SIZE          10
 #define ARP_QUEUEING            1

 /* ---------- IP options ---------- */
 /* Define IP_FORWARD to 1 if you wish to have the ability to forward
    IP packets across network interfaces. If you are going to run lwIP
    on a device with only one network interface, define this to 0. */
 #define IP_FORWARD              1


 /* IP reassembly and segmentation.These are orthogonal even
  * if they both deal with IP fragments */
 #define IP_REASSEMBLY           1
 #define IP_REASS_MAX_PBUFS      10
 #define MEMP_NUM_REASSDATA      10
 #define IP_FRAG                 1
 #define IPV6_FRAG_COPYHEADER    1

 #define LWIP_IGMP               1

 /* ---------- ICMP options ---------- */
 #define ICMP_TTL                255

 /* ---------- DHCP options ---------- */
 /* Define LWIP_DHCP to 1 if you want DHCP configuration of
    interfaces. */
 #define LWIP_DHCP               1

 #define LWIP_DHCP_GET_NTP_SRV   0

 /* 1 if you want to do an ARP check on the offered address
    (recommended if using DHCP). */
 #define DHCP_DOES_ARP_CHECK     (LWIP_DHCP)

 /* ---------- AUTOIP options ------- */
 #define LWIP_AUTOIP             (LWIP_DHCP)

 /* ---------- SNTP options --------- */
 extern void sntp_set_system_time(u32_t sec);
 #define SNTP_SET_SYSTEM_TIME(s) sntp_set_system_time(s)

 /* ---------- SNMP options ---------- */
 #define LWIP_SNMP               1
 #define MIB2_STATS              LWIP_SNMP
 #define SNMP_USE_NETCONN        LWIP_NETCONN
 #define SNMP_USE_RAW            (!LWIP_NETCONN)

 /* ---------- DNS options ---------- */
 #define LWIP_DNS                1

 /* ---------- UDP options ---------- */
 #define LWIP_UDP                1
 #define UDP_TTL                 255

 /* ---------- RAW options ---------- */
 #define LWIP_RAW                0
 #define RAW_TTL                 255

 /* ---------- Statistics options ---------- */
 /* individual STATS options can be turned off by defining them to 0
  * (e.g #define TCP_STATS 0). All of them are turned off if LWIP_STATS
  * is 0
  * */

 #define LWIP_STATS        1
 #define LWIP_STATS_DISPLAY  1

 #define LWIP_NETIF_API    1
 #define LWIP_NETIF_STATUS_CALLBACK 1
 #define LWIP_NETIF_HOSTNAME 0

 /* ---------- SLIP options ---------- */

 #define LWIP_HAVE_SLIPIF  1      /* Set > 0 for SLIP */

 /* Maximum packet size that is received by this netif */
 #define SLIP_MAX_SIZE     1500
 #define sio_tryread sio_read

 /* ---------- 6LoWPAN options ---------- */
 #define LWIP_6LOWPAN      1

 /* ---------- PPP options ---------- */

 #define PPP_SUPPORT       0      /* Set > 0 for PPP */
 #define MPPE_SUPPORT      PPP_SUPPORT
 #define PPPOE_SUPPORT     PPP_SUPPORT
 #define PPPOL2TP_SUPPORT  PPP_SUPPORT
 #define PPPOS_SUPPORT     PPP_SUPPORT

 #if PPP_SUPPORT > 0

 #define NUM_PPP 1           /* Max PPP sessions. */


 /* Select modules to enable.  Ideally these would be set in the makefile but
  * we're limited by the command line length so you need to modify the settings
  * in this file.
  */
 #define PAP_SUPPORT      1      /* Set > 0 for PAP. */
 #define CHAP_SUPPORT     1      /* Set > 0 for CHAP. */
 #define MSCHAP_SUPPORT   0      /* Set > 0 for MSCHAP (NOT FUNCTIONAL!) */
 #define CBCP_SUPPORT     0      /* Set > 0 for CBCP (NOT FUNCTIONAL!) */
 #define CCP_SUPPORT      0      /* Set > 0 for CCP (NOT FUNCTIONAL!) */
 #define VJ_SUPPORT       1      /* Set > 0 for VJ header compression. */
 #define MD5_SUPPORT      1      /* Set > 0 for MD5 (see also CHAP) */


 /*
  * Timeouts.
  */
 #define FSM_DEFTIMEOUT          6       /* Timeout time in seconds */
 #define FSM_DEFMAXTERMREQS      2       /* Maximum Terminate-Request transmissions */
 #define FSM_DEFMAXCONFREQS      10      /* Maximum Configure-Request transmissions */
 #define FSM_DEFMAXNAKLOOPS      5       /* Maximum number of nak loops */

 #define UPAP_DEFTIMEOUT         6       /* Timeout (seconds) for retransmitting req */
 #define UPAP_DEFREQTIME         30      /* Time to wait for auth-req from peer */

 #define CHAP_DEFTIMEOUT         6       /* Timeout time in seconds */
 #define CHAP_DEFTRANSMITS       10      /* max # times to send challenge */


 /* Interval in seconds between keepalive echo requests, 0 to disable. */
 #if 1
 #define LCP_ECHOINTERVAL 0
 #else
 #define LCP_ECHOINTERVAL 10
 #endif

 /* Number of unanswered echo requests before failure. */
 #define LCP_MAXECHOFAILS 3

 /* Max Xmit idle time (in jiffies) before resend flag char. */
 #define PPP_MAXIDLEFLAG 100

 /*
  * Packet sizes
  *
  * Note - lcp shouldn't be allowed to negotiate stuff outside these
  *    limits.  See lcp.h in the pppd directory.
  * (XXX - these constants should simply be shared by lcp.c instead
  *    of living in lcp.h)
  */
 #define PPP_MTU     1500     /* Default MTU (size of Info field) */
 #if 0
 #define PPP_MAXMTU  65535 - (PPP_HDRLEN + PPP_FCSLEN)
 #else
 #define PPP_MAXMTU  1500 /* Largest MTU we allow */
 #endif
 #define PPP_MINMTU  64
 #define PPP_MRU     1500     /* default MRU = max length of info field */
 #define PPP_MAXMRU  1500     /* Largest MRU we allow */
 #define PPP_DEFMRU      296             /* Try for this */
 #define PPP_MINMRU      128             /* No MRUs below this */


 #define MAXNAMELEN      256     /* max length of hostname or name for auth */
 #define MAXSECRETLEN    256     /* max length of password or secret */

 #endif /* PPP_SUPPORT > 0 */

 #endif /* LWIP_LWIPOPTS_H */
	/*
	* Copyright (c) 2001-2003 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. 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 lwIP TCP/IP stack.
	*
	* Author: Adam Dunkels <adam@sics.se>
	*
	*/
	#ifndef LWIP_LWIPOPTS_H
	#define LWIP_LWIPOPTS_H

	#include "lwip/arch.h"

	#define LWIP_NETIF_LOOPBACK 1
	#define LWIP_LOOPBACK_MAX_PBUFS 20

	#define LWIP_RANDOMIZE_INITIAL_LOCAL_PORTS 1

	#define LWIP_IPV4 1
	#define LWIP_IPV6 1

	#define LWIP_COMPAT_SOCKETS 0

	#define LWIP_DBG_MIN_LEVEL 0

	#define TAPIF_DEBUG LWIP_DBG_OFF
	#define TUNIF_DEBUG LWIP_DBG_OFF
	#define UNIXIF_DEBUG LWIP_DBG_OFF
	#define DELIF_DEBUG LWIP_DBG_OFF
	#define SIO_FIFO_DEBUG LWIP_DBG_OFF
	#define TCPDUMP_DEBUG LWIP_DBG_OFF

	#define SLIP_DEBUG LWIP_DBG_OFF
	#define PPP_DEBUG LWIP_DBG_OFF
	#define MEM_DEBUG LWIP_DBG_OFF
	#define MEMP_DEBUG LWIP_DBG_OFF
	#define PBUF_DEBUG LWIP_DBG_OFF
	#define API_LIB_DEBUG LWIP_DBG_OFF
	#define API_MSG_DEBUG LWIP_DBG_OFF
	#define TCPIP_DEBUG LWIP_DBG_OFF
	#define NETIF_DEBUG LWIP_DBG_OFF
	#define SOCKETS_DEBUG LWIP_DBG_OFF
	#define DEMO_DEBUG LWIP_DBG_OFF
	#define IP_DEBUG LWIP_DBG_OFF
	#define IP_REASS_DEBUG LWIP_DBG_OFF
	#define RAW_DEBUG LWIP_DBG_OFF
	#define ICMP_DEBUG LWIP_DBG_OFF
	#define UDP_DEBUG LWIP_DBG_OFF
	#define TCP_DEBUG LWIP_DBG_OFF
	#define TCP_INPUT_DEBUG LWIP_DBG_OFF
	#define TCP_OUTPUT_DEBUG LWIP_DBG_OFF
	#define TCP_RTO_DEBUG LWIP_DBG_OFF
	#define TCP_CWND_DEBUG LWIP_DBG_OFF
	#define TCP_WND_DEBUG LWIP_DBG_OFF
	#define TCP_FR_DEBUG LWIP_DBG_OFF
	#define TCP_QLEN_DEBUG LWIP_DBG_OFF
	#define TCP_RST_DEBUG LWIP_DBG_OFF

	extern unsigned char lwip_debug_flags;
	#define LWIP_DBG_TYPES_ON lwip_debug_flags

	#define NO_SYS 0
	#define LWIP_SOCKET (NO_SYS==0)
	#define LWIP_NETCONN (NO_SYS==0)
	#define SO_REUSE 1
	#define IP_SOF_BROADCAST_RECV 1
	#define IP_SOF_BROADCAST 1
	#define SO_REUSE_RXTOALL 1

	/* ---------- Memory options ---------- */
	/* MEM_ALIGNMENT: should be set to the alignment of the CPU for which
	lwIP is compiled. 4 byte alignment -> define MEM_ALIGNMENT to 4, 2
	byte alignment -> define MEM_ALIGNMENT to 2. */
	/* MSVC port: intel processors don't need 4-byte alignment,
	but are faster that way! */
	#define MEM_ALIGNMENT 4

	/* MEM_SIZE: the size of the heap memory. If the application will send
	a lot of data that needs to be copied, this should be set high. */
	#define MEM_SIZE 1000000

	/* MEMP_NUM_PBUF: the number of memp struct pbufs. If the application
	sends a lot of data out of ROM (or other static memory), this
	should be set high. */
	#define MEMP_NUM_PBUF 3600
	/* MEMP_NUM_RAW_PCB: the number of UDP protocol control blocks. One
	per active RAW "connection". */
	#define MEMP_NUM_RAW_PCB 3
	/* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
	per active UDP "connection". */
	#define MEMP_NUM_UDP_PCB 64
	/* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP
	connections. */
	#define MEMP_NUM_TCP_PCB 64
	/* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP
	connections. */
	#define MEMP_NUM_TCP_PCB_LISTEN 64
	/* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP
	segments. */
	#define MEMP_NUM_TCP_SEG 720
	/* MEMP_NUM_SYS_TIMEOUT: the number of simulateously active
	timeouts. */
	#define MEMP_NUM_SYS_TIMEOUT 120

	/* The following four are used only with the sequential API and can be
	set to 0 if the application only will use the raw API. */
	/* MEMP_NUM_NETBUF: the number of struct netbufs. */
	#define MEMP_NUM_NETBUF 2
	/* MEMP_NUM_NETCONN: the number of struct netconns. */
	#define MEMP_NUM_NETCONN 100
	/* MEMP_NUM_TCPIP_MSG_*: the number of struct tcpip_msg, which is used
	for sequential API communication and incoming packets. Used in
	src/api/tcpip.c. */
	#define MEMP_NUM_TCPIP_MSG_API 120
	#define MEMP_NUM_TCPIP_MSG_INPKT 120

	/* ---------- Pbuf options ---------- */
	/* PBUF_POOL_SIZE: the number of buffers in the pbuf pool. */
	#define PBUF_POOL_SIZE 3600

	/* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. */
	#define PBUF_POOL_BUFSIZE 128

	/* PBUF_LINK_HLEN: the number of bytes that should be allocated for a
	link level header. */
	#define PBUF_LINK_HLEN 16

	/** SYS_LIGHTWEIGHT_PROT
	* define SYS_LIGHTWEIGHT_PROT in lwipopts.h if you want inter-task protection
	* for certain critical regions during buffer allocation, deallocation and memory
	* allocation and deallocation.
	*/
	#define SYS_LIGHTWEIGHT_PROT 1

	#define LWIP_TCPIP_TIMEOUT 1

	/* ---------- TCP options ---------- */
	#define LWIP_TCP 1
	#define TCP_TTL 255

	#define TCP_LISTEN_BACKLOG 1

	/* Controls if TCP should queue segments that arrive out of
	order. Define to 0 if your device is low on memory. */
	#define TCP_QUEUE_OOSEQ 1

	/* TCP Maximum segment size. */
	#define TCP_MSS 1460

	/* TCP sender buffer space (bytes). */
	#define TCP_SND_BUF (TCP_MSS * 42)

	/* TCP sender buffer space (pbufs). This must be at least = 2 *
	TCP_SND_BUF/TCP_MSS for things to work. */
	#define TCP_SND_QUEUELEN (16 * TCP_SND_BUF/TCP_MSS)

	/* TCP writable space (bytes). This must be less than or equal
	to TCP_SND_BUF. It is the amount of space which must be
	available in the tcp snd_buf for select to return writable */
	#define TCP_SNDLOWAT (TCP_SND_BUF/2)

	/* TCP receive window. */
	#define TCP_WND TCP_SND_BUF

	/* Maximum number of retransmissions of data segments. */
	#define TCP_MAXRTX 12

	/* Maximum number of retransmissions of SYN segments. */
	#define TCP_SYNMAXRTX 4

	/* ---------- ARP options ---------- */
	#define LWIP_ARP 1
	#define ARP_TABLE_SIZE 10
	#define ARP_QUEUEING 1

	/* ---------- IP options ---------- */
	/* Define IP_FORWARD to 1 if you wish to have the ability to forward
	IP packets across network interfaces. If you are going to run lwIP
	on a device with only one network interface, define this to 0. */
	#define IP_FORWARD 1


	/* IP reassembly and segmentation.These are orthogonal even
	* if they both deal with IP fragments */
	#define IP_REASSEMBLY 1
	#define IP_REASS_MAX_PBUFS 10
	#define MEMP_NUM_REASSDATA 10
	#define IP_FRAG 1
	#define IPV6_FRAG_COPYHEADER 1

	#define LWIP_IGMP 1

	/* ---------- ICMP options ---------- */
	#define ICMP_TTL 255

	/* ---------- DHCP options ---------- */
	/* Define LWIP_DHCP to 1 if you want DHCP configuration of
	interfaces. */
	#define LWIP_DHCP 1

	#define LWIP_DHCP_GET_NTP_SRV 0

	/* 1 if you want to do an ARP check on the offered address
	(recommended if using DHCP). */
	#define DHCP_DOES_ARP_CHECK (LWIP_DHCP)

	/* ---------- AUTOIP options ------- */
	#define LWIP_AUTOIP (LWIP_DHCP)

	/* ---------- SNTP options --------- */
	extern void sntp_set_system_time(u32_t sec);
	#define SNTP_SET_SYSTEM_TIME(s) sntp_set_system_time(s)

	/* ---------- SNMP options ---------- */
	#define LWIP_SNMP 1
	#define MIB2_STATS LWIP_SNMP
	#define SNMP_USE_NETCONN LWIP_NETCONN
	#define SNMP_USE_RAW (!LWIP_NETCONN)

	/* ---------- DNS options ---------- */
	#define LWIP_DNS 1

	/* ---------- UDP options ---------- */
	#define LWIP_UDP 1
	#define UDP_TTL 255

	/* ---------- RAW options ---------- */
	#define LWIP_RAW 0
	#define RAW_TTL 255

	/* ---------- Statistics options ---------- */
	/* individual STATS options can be turned off by defining them to 0
	* (e.g #define TCP_STATS 0). All of them are turned off if LWIP_STATS
	* is 0
	* */

	#define LWIP_STATS 1
	#define LWIP_STATS_DISPLAY 1

	#define LWIP_NETIF_API 1
	#define LWIP_NETIF_STATUS_CALLBACK 1
	#define LWIP_NETIF_HOSTNAME 0

	/* ---------- SLIP options ---------- */

	#define LWIP_HAVE_SLIPIF 1 /* Set > 0 for SLIP */

	/* Maximum packet size that is received by this netif */
	#define SLIP_MAX_SIZE 1500
	#define sio_tryread sio_read

	/* ---------- 6LoWPAN options ---------- */
	#define LWIP_6LOWPAN 1

	/* ---------- PPP options ---------- */

	#define PPP_SUPPORT 0 /* Set > 0 for PPP */
	#define MPPE_SUPPORT PPP_SUPPORT
	#define PPPOE_SUPPORT PPP_SUPPORT
	#define PPPOL2TP_SUPPORT PPP_SUPPORT
	#define PPPOS_SUPPORT PPP_SUPPORT

	#if PPP_SUPPORT > 0

	#define NUM_PPP 1 /* Max PPP sessions. */


	/* Select modules to enable. Ideally these would be set in the makefile but
	* we're limited by the command line length so you need to modify the settings
	* in this file.
	*/
	#define PAP_SUPPORT 1 /* Set > 0 for PAP. */
	#define CHAP_SUPPORT 1 /* Set > 0 for CHAP. */
	#define MSCHAP_SUPPORT 0 /* Set > 0 for MSCHAP (NOT FUNCTIONAL!) */
	#define CBCP_SUPPORT 0 /* Set > 0 for CBCP (NOT FUNCTIONAL!) */
	#define CCP_SUPPORT 0 /* Set > 0 for CCP (NOT FUNCTIONAL!) */
	#define VJ_SUPPORT 1 /* Set > 0 for VJ header compression. */
	#define MD5_SUPPORT 1 /* Set > 0 for MD5 (see also CHAP) */


	/*
	* Timeouts.
	*/
	#define FSM_DEFTIMEOUT 6 /* Timeout time in seconds */
	#define FSM_DEFMAXTERMREQS 2 /* Maximum Terminate-Request transmissions */
	#define FSM_DEFMAXCONFREQS 10 /* Maximum Configure-Request transmissions */
	#define FSM_DEFMAXNAKLOOPS 5 /* Maximum number of nak loops */

	#define UPAP_DEFTIMEOUT 6 /* Timeout (seconds) for retransmitting req */
	#define UPAP_DEFREQTIME 30 /* Time to wait for auth-req from peer */

	#define CHAP_DEFTIMEOUT 6 /* Timeout time in seconds */
	#define CHAP_DEFTRANSMITS 10 /* max # times to send challenge */


	/* Interval in seconds between keepalive echo requests, 0 to disable. */
	#if 1
	#define LCP_ECHOINTERVAL 0
	#else
	#define LCP_ECHOINTERVAL 10
	#endif

	/* Number of unanswered echo requests before failure. */
	#define LCP_MAXECHOFAILS 3

	/* Max Xmit idle time (in jiffies) before resend flag char. */
	#define PPP_MAXIDLEFLAG 100

	/*
	* Packet sizes
	*
	* Note - lcp shouldn't be allowed to negotiate stuff outside these
	* limits. See lcp.h in the pppd directory.
	* (XXX - these constants should simply be shared by lcp.c instead
	* of living in lcp.h)
	*/
	#define PPP_MTU 1500 /* Default MTU (size of Info field) */
	#if 0
	#define PPP_MAXMTU 65535 - (PPP_HDRLEN + PPP_FCSLEN)
	#else
	#define PPP_MAXMTU 1500 /* Largest MTU we allow */
	#endif
	#define PPP_MINMTU 64
	#define PPP_MRU 1500 /* default MRU = max length of info field */
	#define PPP_MAXMRU 1500 /* Largest MRU we allow */
	#define PPP_DEFMRU 296 /* Try for this */
	#define PPP_MINMRU 128 /* No MRUs below this */


	#define MAXNAMELEN 256 /* max length of hostname or name for auth */
	#define MAXSECRETLEN 256 /* max length of password or secret */

	#endif /* PPP_SUPPORT > 0 */

	#endif /* LWIP_LWIPOPTS_H */