Official mbed lwIP library (version 1.4.0)

Dependents:   LwIPNetworking NetServicesMin EthernetInterface EthernetInterface_RSF ... more

Legacy Networking Libraries

This is an mbed 2 networking library. For mbed OS 5, lwip has been integrated with built-in networking interfaces. The networking libraries have been revised to better support additional network stacks and thread safety here.

This library is based on the code of lwIP v1.4.0

Copyright (c) 2001, 2002 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.

include/lwip/opt.h

Committer:
mbed_official
Date:
2016-03-14
Revision:
20:08f08bfc3f3d
Parent:
0:51ac1d130fd4

File content as of revision 20:08f08bfc3f3d:

/**
 * @file
 *
 * lwIP Options Configuration
 */

/*
 * Copyright (c) 2001-2004 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. 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_OPT_H__
#define __LWIP_OPT_H__

/*
 * Include user defined options first. Anything not defined in these files
 * will be set to standard values. Override anything you dont like!
 */
#include "lwipopts.h"
#include "lwip/debug.h"

/*
   -----------------------------------------------
   ---------- Platform specific locking ----------
   -----------------------------------------------
*/

/**
 * SYS_LIGHTWEIGHT_PROT==1: if you want inter-task protection for certain
 * critical regions during buffer allocation, deallocation and memory
 * allocation and deallocation.
 */
#ifndef SYS_LIGHTWEIGHT_PROT
#define SYS_LIGHTWEIGHT_PROT            0
#endif

/** 
 * NO_SYS==1: Provides VERY minimal functionality. Otherwise,
 * use lwIP facilities.
 */
#ifndef NO_SYS
#define NO_SYS                          0
#endif

/**
 * NO_SYS_NO_TIMERS==1: Drop support for sys_timeout when NO_SYS==1
 * Mainly for compatibility to old versions.
 */
#ifndef NO_SYS_NO_TIMERS
#define NO_SYS_NO_TIMERS                0
#endif

/**
 * MEMCPY: override this if you have a faster implementation at hand than the
 * one included in your C library
 */
#ifndef MEMCPY
#define MEMCPY(dst,src,len)             memcpy(dst,src,len)
#endif

/**
 * SMEMCPY: override this with care! Some compilers (e.g. gcc) can inline a
 * call to memcpy() if the length is known at compile time and is small.
 */
#ifndef SMEMCPY
#define SMEMCPY(dst,src,len)            memcpy(dst,src,len)
#endif

/*
   ------------------------------------
   ---------- Memory options ----------
   ------------------------------------
*/
/**
 * MEM_LIBC_MALLOC==1: Use malloc/free/realloc provided by your C-library
 * instead of the lwip internal allocator. Can save code size if you
 * already use it.
 */
#ifndef MEM_LIBC_MALLOC
#define MEM_LIBC_MALLOC                 0
#endif

/**
* MEMP_MEM_MALLOC==1: Use mem_malloc/mem_free instead of the lwip pool allocator.
* Especially useful with MEM_LIBC_MALLOC but handle with care regarding execution
* speed and usage from interrupts!
*/
#ifndef MEMP_MEM_MALLOC
#define MEMP_MEM_MALLOC                 0
#endif

/**
 * MEM_ALIGNMENT: should be set to the alignment of the CPU
 *    4 byte alignment -> #define MEM_ALIGNMENT 4
 *    2 byte alignment -> #define MEM_ALIGNMENT 2
 */
#ifndef MEM_ALIGNMENT
#define MEM_ALIGNMENT                   1
#endif

/**
 * 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.
 */
#ifndef MEM_SIZE
#define MEM_SIZE                        1600
#endif

/**
 * MEMP_SEPARATE_POOLS: if defined to 1, each pool is placed in its own array.
 * This can be used to individually change the location of each pool.
 * Default is one big array for all pools
 */
#ifndef MEMP_SEPARATE_POOLS
#define MEMP_SEPARATE_POOLS             0
#endif

/**
 * MEMP_OVERFLOW_CHECK: memp overflow protection reserves a configurable
 * amount of bytes before and after each memp element in every pool and fills
 * it with a prominent default value.
 *    MEMP_OVERFLOW_CHECK == 0 no checking
 *    MEMP_OVERFLOW_CHECK == 1 checks each element when it is freed
 *    MEMP_OVERFLOW_CHECK >= 2 checks each element in every pool every time
 *      memp_malloc() or memp_free() is called (useful but slow!)
 */
#ifndef MEMP_OVERFLOW_CHECK
#define MEMP_OVERFLOW_CHECK             0
#endif

/**
 * MEMP_SANITY_CHECK==1: run a sanity check after each memp_free() to make
 * sure that there are no cycles in the linked lists.
 */
#ifndef MEMP_SANITY_CHECK
#define MEMP_SANITY_CHECK               0
#endif

/**
 * MEM_USE_POOLS==1: Use an alternative to malloc() by allocating from a set
 * of memory pools of various sizes. When mem_malloc is called, an element of
 * the smallest pool that can provide the length needed is returned.
 * To use this, MEMP_USE_CUSTOM_POOLS also has to be enabled.
 */
#ifndef MEM_USE_POOLS
#define MEM_USE_POOLS                   0
#endif

/**
 * MEM_USE_POOLS_TRY_BIGGER_POOL==1: if one malloc-pool is empty, try the next
 * bigger pool - WARNING: THIS MIGHT WASTE MEMORY but it can make a system more
 * reliable. */
#ifndef MEM_USE_POOLS_TRY_BIGGER_POOL
#define MEM_USE_POOLS_TRY_BIGGER_POOL   0
#endif

/**
 * MEMP_USE_CUSTOM_POOLS==1: whether to include a user file lwippools.h
 * that defines additional pools beyond the "standard" ones required
 * by lwIP. If you set this to 1, you must have lwippools.h in your 
 * inlude path somewhere. 
 */
#ifndef MEMP_USE_CUSTOM_POOLS
#define MEMP_USE_CUSTOM_POOLS           0
#endif

/**
 * Set this to 1 if you want to free PBUF_RAM pbufs (or call mem_free()) from
 * interrupt context (or another context that doesn't allow waiting for a
 * semaphore).
 * If set to 1, mem_malloc will be protected by a semaphore and SYS_ARCH_PROTECT,
 * while mem_free will only use SYS_ARCH_PROTECT. mem_malloc SYS_ARCH_UNPROTECTs
 * with each loop so that mem_free can run.
 *
 * ATTENTION: As you can see from the above description, this leads to dis-/
 * enabling interrupts often, which can be slow! Also, on low memory, mem_malloc
 * can need longer.
 *
 * If you don't want that, at least for NO_SYS=0, you can still use the following
 * functions to enqueue a deallocation call which then runs in the tcpip_thread
 * context:
 * - pbuf_free_callback(p);
 * - mem_free_callback(m);
 */
#ifndef LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT
#define LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT 0
#endif

/*
   ------------------------------------------------
   ---------- Internal Memory Pool Sizes ----------
   ------------------------------------------------
*/
/**
 * MEMP_NUM_PBUF: the number of memp struct pbufs (used for PBUF_ROM and PBUF_REF).
 * If the application sends a lot of data out of ROM (or other static memory),
 * this should be set high.
 */
#ifndef MEMP_NUM_PBUF
#define MEMP_NUM_PBUF                   16
#endif

/**
 * MEMP_NUM_RAW_PCB: Number of raw connection PCBs
 * (requires the LWIP_RAW option)
 */
#ifndef MEMP_NUM_RAW_PCB
#define MEMP_NUM_RAW_PCB                4
#endif

/**
 * MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
 * per active UDP "connection".
 * (requires the LWIP_UDP option)
 */
#ifndef MEMP_NUM_UDP_PCB
#define MEMP_NUM_UDP_PCB                4
#endif

/**
 * MEMP_NUM_TCP_PCB: the number of simulatenously active TCP connections.
 * (requires the LWIP_TCP option)
 */
#ifndef MEMP_NUM_TCP_PCB
#define MEMP_NUM_TCP_PCB                5
#endif

/**
 * MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP connections.
 * (requires the LWIP_TCP option)
 */
#ifndef MEMP_NUM_TCP_PCB_LISTEN
#define MEMP_NUM_TCP_PCB_LISTEN         8
#endif

/**
 * MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP segments.
 * (requires the LWIP_TCP option)
 */
#ifndef MEMP_NUM_TCP_SEG
#define MEMP_NUM_TCP_SEG                16
#endif

/**
 * MEMP_NUM_REASSDATA: the number of IP packets simultaneously queued for
 * reassembly (whole packets, not fragments!)
 */
#ifndef MEMP_NUM_REASSDATA
#define MEMP_NUM_REASSDATA              5
#endif

/**
 * MEMP_NUM_FRAG_PBUF: the number of IP fragments simultaneously sent
 * (fragments, not whole packets!).
 * This is only used with IP_FRAG_USES_STATIC_BUF==0 and
 * LWIP_NETIF_TX_SINGLE_PBUF==0 and only has to be > 1 with DMA-enabled MACs
 * where the packet is not yet sent when netif->output returns.
 */
#ifndef MEMP_NUM_FRAG_PBUF
#define MEMP_NUM_FRAG_PBUF              15
#endif

/**
 * MEMP_NUM_ARP_QUEUE: the number of simulateously queued outgoing
 * packets (pbufs) that are waiting for an ARP request (to resolve
 * their destination address) to finish.
 * (requires the ARP_QUEUEING option)
 */
#ifndef MEMP_NUM_ARP_QUEUE
#define MEMP_NUM_ARP_QUEUE              30
#endif

/**
 * MEMP_NUM_IGMP_GROUP: The number of multicast groups whose network interfaces
 * can be members et the same time (one per netif - allsystems group -, plus one
 * per netif membership).
 * (requires the LWIP_IGMP option)
 */
#ifndef MEMP_NUM_IGMP_GROUP
#define MEMP_NUM_IGMP_GROUP             8
#endif

/**
 * MEMP_NUM_SYS_TIMEOUT: the number of simulateously active timeouts.
 * (requires NO_SYS==0)
 */
#ifndef MEMP_NUM_SYS_TIMEOUT
#define MEMP_NUM_SYS_TIMEOUT            3
#endif

/**
 * MEMP_NUM_NETBUF: the number of struct netbufs.
 * (only needed if you use the sequential API, like api_lib.c)
 */
#ifndef MEMP_NUM_NETBUF
#define MEMP_NUM_NETBUF                 2
#endif

/**
 * MEMP_NUM_NETCONN: the number of struct netconns.
 * (only needed if you use the sequential API, like api_lib.c)
 */
#ifndef MEMP_NUM_NETCONN
#define MEMP_NUM_NETCONN                4
#endif

/**
 * MEMP_NUM_TCPIP_MSG_API: the number of struct tcpip_msg, which are used
 * for callback/timeout API communication. 
 * (only needed if you use tcpip.c)
 */
#ifndef MEMP_NUM_TCPIP_MSG_API
#define MEMP_NUM_TCPIP_MSG_API          8
#endif

/**
 * MEMP_NUM_TCPIP_MSG_INPKT: the number of struct tcpip_msg, which are used
 * for incoming packets. 
 * (only needed if you use tcpip.c)
 */
#ifndef MEMP_NUM_TCPIP_MSG_INPKT
#define MEMP_NUM_TCPIP_MSG_INPKT        8
#endif

/**
 * MEMP_NUM_SNMP_NODE: the number of leafs in the SNMP tree.
 */
#ifndef MEMP_NUM_SNMP_NODE
#define MEMP_NUM_SNMP_NODE              50
#endif

/**
 * MEMP_NUM_SNMP_ROOTNODE: the number of branches in the SNMP tree.
 * Every branch has one leaf (MEMP_NUM_SNMP_NODE) at least!
 */
#ifndef MEMP_NUM_SNMP_ROOTNODE
#define MEMP_NUM_SNMP_ROOTNODE          30
#endif

/**
 * MEMP_NUM_SNMP_VARBIND: the number of concurrent requests (does not have to
 * be changed normally) - 2 of these are used per request (1 for input,
 * 1 for output)
 */
#ifndef MEMP_NUM_SNMP_VARBIND
#define MEMP_NUM_SNMP_VARBIND           2
#endif

/**
 * MEMP_NUM_SNMP_VALUE: the number of OID or values concurrently used
 * (does not have to be changed normally) - 3 of these are used per request
 * (1 for the value read and 2 for OIDs - input and output)
 */
#ifndef MEMP_NUM_SNMP_VALUE
#define MEMP_NUM_SNMP_VALUE             3
#endif

/**
 * MEMP_NUM_NETDB: the number of concurrently running lwip_addrinfo() calls
 * (before freeing the corresponding memory using lwip_freeaddrinfo()).
 */
#ifndef MEMP_NUM_NETDB
#define MEMP_NUM_NETDB                  1
#endif

/**
 * MEMP_NUM_LOCALHOSTLIST: the number of host entries in the local host list
 * if DNS_LOCAL_HOSTLIST_IS_DYNAMIC==1.
 */
#ifndef MEMP_NUM_LOCALHOSTLIST
#define MEMP_NUM_LOCALHOSTLIST          1
#endif

/**
 * MEMP_NUM_PPPOE_INTERFACES: the number of concurrently active PPPoE
 * interfaces (only used with PPPOE_SUPPORT==1)
 */
#ifndef MEMP_NUM_PPPOE_INTERFACES
#define MEMP_NUM_PPPOE_INTERFACES       1
#endif

/**
 * PBUF_POOL_SIZE: the number of buffers in the pbuf pool. 
 */
#ifndef PBUF_POOL_SIZE
#define PBUF_POOL_SIZE                  16
#endif

/*
   ---------------------------------
   ---------- ARP options ----------
   ---------------------------------
*/
/**
 * LWIP_ARP==1: Enable ARP functionality.
 */
#ifndef LWIP_ARP
#define LWIP_ARP                        1
#endif

/**
 * ARP_TABLE_SIZE: Number of active MAC-IP address pairs cached.
 */
#ifndef ARP_TABLE_SIZE
#define ARP_TABLE_SIZE                  10
#endif

/**
 * ARP_QUEUEING==1: Multiple outgoing packets are queued during hardware address
 * resolution. By default, only the most recent packet is queued per IP address.
 * This is sufficient for most protocols and mainly reduces TCP connection
 * startup time. Set this to 1 if you know your application sends more than one
 * packet in a row to an IP address that is not in the ARP cache.
 */
#ifndef ARP_QUEUEING
#define ARP_QUEUEING                    0
#endif

/**
 * ETHARP_TRUST_IP_MAC==1: Incoming IP packets cause the ARP table to be
 * updated with the source MAC and IP addresses supplied in the packet.
 * You may want to disable this if you do not trust LAN peers to have the
 * correct addresses, or as a limited approach to attempt to handle
 * spoofing. If disabled, lwIP will need to make a new ARP request if
 * the peer is not already in the ARP table, adding a little latency.
 * The peer *is* in the ARP table if it requested our address before.
 * Also notice that this slows down input processing of every IP packet!
 */
#ifndef ETHARP_TRUST_IP_MAC
#define ETHARP_TRUST_IP_MAC             0
#endif

/**
 * ETHARP_SUPPORT_VLAN==1: support receiving ethernet packets with VLAN header.
 * Additionally, you can define ETHARP_VLAN_CHECK to an u16_t VLAN ID to check.
 * If ETHARP_VLAN_CHECK is defined, only VLAN-traffic for this VLAN is accepted.
 * If ETHARP_VLAN_CHECK is not defined, all traffic is accepted.
 */
#ifndef ETHARP_SUPPORT_VLAN
#define ETHARP_SUPPORT_VLAN             0
#endif

/** LWIP_ETHERNET==1: enable ethernet support for PPPoE even though ARP
 * might be disabled
 */
#ifndef LWIP_ETHERNET
#define LWIP_ETHERNET                   (LWIP_ARP || PPPOE_SUPPORT)
#endif

/** ETH_PAD_SIZE: number of bytes added before the ethernet header to ensure
 * alignment of payload after that header. Since the header is 14 bytes long,
 * without this padding e.g. addresses in the IP header will not be aligned
 * on a 32-bit boundary, so setting this to 2 can speed up 32-bit-platforms.
 */
#ifndef ETH_PAD_SIZE
#define ETH_PAD_SIZE                    0
#endif

/** ETHARP_SUPPORT_STATIC_ENTRIES==1: enable code to support static ARP table
 * entries (using etharp_add_static_entry/etharp_remove_static_entry).
 */
#ifndef ETHARP_SUPPORT_STATIC_ENTRIES
#define ETHARP_SUPPORT_STATIC_ENTRIES   0
#endif


/*
   --------------------------------
   ---------- IP options ----------
   --------------------------------
*/
/**
 * IP_FORWARD==1: Enables 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.
 */
#ifndef IP_FORWARD
#define IP_FORWARD                      0
#endif

/**
 * IP_OPTIONS_ALLOWED: Defines the behavior for IP options.
 *      IP_OPTIONS_ALLOWED==0: All packets with IP options are dropped.
 *      IP_OPTIONS_ALLOWED==1: IP options are allowed (but not parsed).
 */
#ifndef IP_OPTIONS_ALLOWED
#define IP_OPTIONS_ALLOWED              1
#endif

/**
 * IP_REASSEMBLY==1: Reassemble incoming fragmented IP packets. Note that
 * this option does not affect outgoing packet sizes, which can be controlled
 * via IP_FRAG.
 */
#ifndef IP_REASSEMBLY
#define IP_REASSEMBLY                   1
#endif

/**
 * IP_FRAG==1: Fragment outgoing IP packets if their size exceeds MTU. Note
 * that this option does not affect incoming packet sizes, which can be
 * controlled via IP_REASSEMBLY.
 */
#ifndef IP_FRAG
#define IP_FRAG                         1
#endif

/**
 * IP_REASS_MAXAGE: Maximum time (in multiples of IP_TMR_INTERVAL - so seconds, normally)
 * a fragmented IP packet waits for all fragments to arrive. If not all fragments arrived
 * in this time, the whole packet is discarded.
 */
#ifndef IP_REASS_MAXAGE
#define IP_REASS_MAXAGE                 3
#endif

/**
 * IP_REASS_MAX_PBUFS: Total maximum amount of pbufs waiting to be reassembled.
 * Since the received pbufs are enqueued, be sure to configure
 * PBUF_POOL_SIZE > IP_REASS_MAX_PBUFS so that the stack is still able to receive
 * packets even if the maximum amount of fragments is enqueued for reassembly!
 */
#ifndef IP_REASS_MAX_PBUFS
#define IP_REASS_MAX_PBUFS              10
#endif

/**
 * IP_FRAG_USES_STATIC_BUF==1: Use a static MTU-sized buffer for IP
 * fragmentation. Otherwise pbufs are allocated and reference the original
 * packet data to be fragmented (or with LWIP_NETIF_TX_SINGLE_PBUF==1,
 * new PBUF_RAM pbufs are used for fragments).
 * ATTENTION: IP_FRAG_USES_STATIC_BUF==1 may not be used for DMA-enabled MACs!
 */
#ifndef IP_FRAG_USES_STATIC_BUF
#define IP_FRAG_USES_STATIC_BUF         0
#endif

/**
 * IP_FRAG_MAX_MTU: Assumed max MTU on any interface for IP frag buffer
 * (requires IP_FRAG_USES_STATIC_BUF==1)
 */
#if IP_FRAG_USES_STATIC_BUF && !defined(IP_FRAG_MAX_MTU)
#define IP_FRAG_MAX_MTU                 1500
#endif

/**
 * IP_DEFAULT_TTL: Default value for Time-To-Live used by transport layers.
 */
#ifndef IP_DEFAULT_TTL
#define IP_DEFAULT_TTL                  255
#endif

/**
 * IP_SOF_BROADCAST=1: Use the SOF_BROADCAST field to enable broadcast
 * filter per pcb on udp and raw send operations. To enable broadcast filter
 * on recv operations, you also have to set IP_SOF_BROADCAST_RECV=1.
 */
#ifndef IP_SOF_BROADCAST
#define IP_SOF_BROADCAST                0
#endif

/**
 * IP_SOF_BROADCAST_RECV (requires IP_SOF_BROADCAST=1) enable the broadcast
 * filter on recv operations.
 */
#ifndef IP_SOF_BROADCAST_RECV
#define IP_SOF_BROADCAST_RECV           0
#endif

/*
   ----------------------------------
   ---------- ICMP options ----------
   ----------------------------------
*/
/**
 * LWIP_ICMP==1: Enable ICMP module inside the IP stack.
 * Be careful, disable that make your product non-compliant to RFC1122
 */
#ifndef LWIP_ICMP
#define LWIP_ICMP                       1
#endif

/**
 * ICMP_TTL: Default value for Time-To-Live used by ICMP packets.
 */
#ifndef ICMP_TTL
#define ICMP_TTL                       (IP_DEFAULT_TTL)
#endif

/**
 * LWIP_BROADCAST_PING==1: respond to broadcast pings (default is unicast only)
 */
#ifndef LWIP_BROADCAST_PING
#define LWIP_BROADCAST_PING             0
#endif

/**
 * LWIP_MULTICAST_PING==1: respond to multicast pings (default is unicast only)
 */
#ifndef LWIP_MULTICAST_PING
#define LWIP_MULTICAST_PING             0
#endif

/*
   ---------------------------------
   ---------- RAW options ----------
   ---------------------------------
*/
/**
 * LWIP_RAW==1: Enable application layer to hook into the IP layer itself.
 */
#ifndef LWIP_RAW
#define LWIP_RAW                        1
#endif

/**
 * LWIP_RAW==1: Enable application layer to hook into the IP layer itself.
 */
#ifndef RAW_TTL
#define RAW_TTL                        (IP_DEFAULT_TTL)
#endif

/*
   ----------------------------------
   ---------- DHCP options ----------
   ----------------------------------
*/
/**
 * LWIP_DHCP==1: Enable DHCP module.
 */
#ifndef LWIP_DHCP
#define LWIP_DHCP                       0
#endif

/**
 * DHCP_DOES_ARP_CHECK==1: Do an ARP check on the offered address.
 */
#ifndef DHCP_DOES_ARP_CHECK
#define DHCP_DOES_ARP_CHECK             ((LWIP_DHCP) && (LWIP_ARP))
#endif

/*
   ------------------------------------
   ---------- AUTOIP options ----------
   ------------------------------------
*/
/**
 * LWIP_AUTOIP==1: Enable AUTOIP module.
 */
#ifndef LWIP_AUTOIP
#define LWIP_AUTOIP                     0
#endif

/**
 * LWIP_DHCP_AUTOIP_COOP==1: Allow DHCP and AUTOIP to be both enabled on
 * the same interface at the same time.
 */
#ifndef LWIP_DHCP_AUTOIP_COOP
#define LWIP_DHCP_AUTOIP_COOP           0
#endif

/**
 * LWIP_DHCP_AUTOIP_COOP_TRIES: Set to the number of DHCP DISCOVER probes
 * that should be sent before falling back on AUTOIP. This can be set
 * as low as 1 to get an AutoIP address very quickly, but you should
 * be prepared to handle a changing IP address when DHCP overrides
 * AutoIP.
 */
#ifndef LWIP_DHCP_AUTOIP_COOP_TRIES
#define LWIP_DHCP_AUTOIP_COOP_TRIES     9
#endif

/*
   ----------------------------------
   ---------- SNMP options ----------
   ----------------------------------
*/
/**
 * LWIP_SNMP==1: Turn on SNMP module. UDP must be available for SNMP
 * transport.
 */
#ifndef LWIP_SNMP
#define LWIP_SNMP                       0
#endif

/**
 * SNMP_CONCURRENT_REQUESTS: Number of concurrent requests the module will
 * allow. At least one request buffer is required.
 * Does not have to be changed unless external MIBs answer request asynchronously
 */
#ifndef SNMP_CONCURRENT_REQUESTS
#define SNMP_CONCURRENT_REQUESTS        1
#endif

/**
 * SNMP_TRAP_DESTINATIONS: Number of trap destinations. At least one trap
 * destination is required
 */
#ifndef SNMP_TRAP_DESTINATIONS
#define SNMP_TRAP_DESTINATIONS          1
#endif

/**
 * SNMP_PRIVATE_MIB: 
 * When using a private MIB, you have to create a file 'private_mib.h' that contains
 * a 'struct mib_array_node mib_private' which contains your MIB.
 */
#ifndef SNMP_PRIVATE_MIB
#define SNMP_PRIVATE_MIB                0
#endif

/**
 * Only allow SNMP write actions that are 'safe' (e.g. disabeling netifs is not
 * a safe action and disabled when SNMP_SAFE_REQUESTS = 1).
 * Unsafe requests are disabled by default!
 */
#ifndef SNMP_SAFE_REQUESTS
#define SNMP_SAFE_REQUESTS              1
#endif

/**
 * The maximum length of strings used. This affects the size of
 * MEMP_SNMP_VALUE elements.
 */
#ifndef SNMP_MAX_OCTET_STRING_LEN
#define SNMP_MAX_OCTET_STRING_LEN       127
#endif

/**
 * The maximum depth of the SNMP tree.
 * With private MIBs enabled, this depends on your MIB!
 * This affects the size of MEMP_SNMP_VALUE elements.
 */
#ifndef SNMP_MAX_TREE_DEPTH
#define SNMP_MAX_TREE_DEPTH             15
#endif

/**
 * The size of the MEMP_SNMP_VALUE elements, normally calculated from
 * SNMP_MAX_OCTET_STRING_LEN and SNMP_MAX_TREE_DEPTH.
 */
#ifndef SNMP_MAX_VALUE_SIZE
#define SNMP_MAX_VALUE_SIZE             LWIP_MAX((SNMP_MAX_OCTET_STRING_LEN)+1, sizeof(s32_t)*(SNMP_MAX_TREE_DEPTH))
#endif

/*
   ----------------------------------
   ---------- IGMP options ----------
   ----------------------------------
*/
/**
 * LWIP_IGMP==1: Turn on IGMP module. 
 */
#ifndef LWIP_IGMP
#define LWIP_IGMP                       0
#endif

/*
   ----------------------------------
   ---------- DNS options -----------
   ----------------------------------
*/
/**
 * LWIP_DNS==1: Turn on DNS module. UDP must be available for DNS
 * transport.
 */
#ifndef LWIP_DNS
#define LWIP_DNS                        0
#endif

/** DNS maximum number of entries to maintain locally. */
#ifndef DNS_TABLE_SIZE
#define DNS_TABLE_SIZE                  4
#endif

/** DNS maximum host name length supported in the name table. */
#ifndef DNS_MAX_NAME_LENGTH
#define DNS_MAX_NAME_LENGTH             256
#endif

/** The maximum of DNS servers */
#ifndef DNS_MAX_SERVERS
#define DNS_MAX_SERVERS                 2
#endif

/** DNS do a name checking between the query and the response. */
#ifndef DNS_DOES_NAME_CHECK
#define DNS_DOES_NAME_CHECK             1
#endif

/** DNS message max. size. Default value is RFC compliant. */
#ifndef DNS_MSG_SIZE
#define DNS_MSG_SIZE                    512
#endif

/** DNS_LOCAL_HOSTLIST: Implements a local host-to-address list. If enabled,
 *  you have to define
 *    #define DNS_LOCAL_HOSTLIST_INIT {{"host1", 0x123}, {"host2", 0x234}}
 *  (an array of structs name/address, where address is an u32_t in network
 *  byte order).
 *
 *  Instead, you can also use an external function:
 *  #define DNS_LOOKUP_LOCAL_EXTERN(x) extern u32_t my_lookup_function(const char *name)
 *  that returns the IP address or INADDR_NONE if not found.
 */
#ifndef DNS_LOCAL_HOSTLIST
#define DNS_LOCAL_HOSTLIST              0
#endif /* DNS_LOCAL_HOSTLIST */

/** If this is turned on, the local host-list can be dynamically changed
 *  at runtime. */
#ifndef DNS_LOCAL_HOSTLIST_IS_DYNAMIC
#define DNS_LOCAL_HOSTLIST_IS_DYNAMIC   0
#endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */

/*
   ---------------------------------
   ---------- UDP options ----------
   ---------------------------------
*/
/**
 * LWIP_UDP==1: Turn on UDP.
 */
#ifndef LWIP_UDP
#define LWIP_UDP                        1
#endif

/**
 * LWIP_UDPLITE==1: Turn on UDP-Lite. (Requires LWIP_UDP)
 */
#ifndef LWIP_UDPLITE
#define LWIP_UDPLITE                    0
#endif

/**
 * UDP_TTL: Default Time-To-Live value.
 */
#ifndef UDP_TTL
#define UDP_TTL                         (IP_DEFAULT_TTL)
#endif

/**
 * LWIP_NETBUF_RECVINFO==1: append destination addr and port to every netbuf.
 */
#ifndef LWIP_NETBUF_RECVINFO
#define LWIP_NETBUF_RECVINFO            0
#endif

/*
   ---------------------------------
   ---------- TCP options ----------
   ---------------------------------
*/
/**
 * LWIP_TCP==1: Turn on TCP.
 */
#ifndef LWIP_TCP
#define LWIP_TCP                        1
#endif

/**
 * TCP_TTL: Default Time-To-Live value.
 */
#ifndef TCP_TTL
#define TCP_TTL                         (IP_DEFAULT_TTL)
#endif

/**
 * TCP_WND: The size of a TCP window.  This must be at least 
 * (2 * TCP_MSS) for things to work well
 */
#ifndef TCP_WND
#define TCP_WND                         (4 * TCP_MSS)
#endif 

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

/**
 * TCP_SYNMAXRTX: Maximum number of retransmissions of SYN segments.
 */
#ifndef TCP_SYNMAXRTX
#define TCP_SYNMAXRTX                   6
#endif

/**
 * TCP_QUEUE_OOSEQ==1: TCP will queue segments that arrive out of order.
 * Define to 0 if your device is low on memory.
 */
#ifndef TCP_QUEUE_OOSEQ
#define TCP_QUEUE_OOSEQ                 (LWIP_TCP)
#endif

/**
 * TCP_MSS: TCP Maximum segment size. (default is 536, a conservative default,
 * you might want to increase this.)
 * For the receive side, this MSS is advertised to the remote side
 * when opening a connection. For the transmit size, this MSS sets
 * an upper limit on the MSS advertised by the remote host.
 */
#ifndef TCP_MSS
#define TCP_MSS                         536
#endif

/**
 * TCP_CALCULATE_EFF_SEND_MSS: "The maximum size of a segment that TCP really
 * sends, the 'effective send MSS,' MUST be the smaller of the send MSS (which
 * reflects the available reassembly buffer size at the remote host) and the
 * largest size permitted by the IP layer" (RFC 1122)
 * Setting this to 1 enables code that checks TCP_MSS against the MTU of the
 * netif used for a connection and limits the MSS if it would be too big otherwise.
 */
#ifndef TCP_CALCULATE_EFF_SEND_MSS
#define TCP_CALCULATE_EFF_SEND_MSS      1
#endif


/**
 * TCP_SND_BUF: TCP sender buffer space (bytes). 
 */
#ifndef TCP_SND_BUF
#define TCP_SND_BUF                     256
#endif

/**
 * TCP_SND_QUEUELEN: TCP sender buffer space (pbufs). This must be at least
 * as much as (2 * TCP_SND_BUF/TCP_MSS) for things to work.
 */
#ifndef TCP_SND_QUEUELEN
#define TCP_SND_QUEUELEN                ((4 * (TCP_SND_BUF) + (TCP_MSS - 1))/(TCP_MSS))
#endif

/**
 * TCP_SNDLOWAT: TCP writable space (bytes). This must be less than
 * TCP_SND_BUF. It is the amount of space which must be available in the
 * TCP snd_buf for select to return writable (combined with TCP_SNDQUEUELOWAT).
 */
#ifndef TCP_SNDLOWAT
#define TCP_SNDLOWAT                    ((TCP_SND_BUF)/2)
#endif

/**
 * TCP_SNDQUEUELOWAT: TCP writable bufs (pbuf count). This must be grater
 * than TCP_SND_QUEUELEN. If the number of pbufs queued on a pcb drops below
 * this number, select returns writable (combined with TCP_SNDLOWAT).
 */
#ifndef TCP_SNDQUEUELOWAT
#define TCP_SNDQUEUELOWAT               ((TCP_SND_QUEUELEN)/2)
#endif

/**
 * TCP_LISTEN_BACKLOG: Enable the backlog option for tcp listen pcb.
 */
#ifndef TCP_LISTEN_BACKLOG
#define TCP_LISTEN_BACKLOG              0
#endif

/**
 * The maximum allowed backlog for TCP listen netconns.
 * This backlog is used unless another is explicitly specified.
 * 0xff is the maximum (u8_t).
 */
#ifndef TCP_DEFAULT_LISTEN_BACKLOG
#define TCP_DEFAULT_LISTEN_BACKLOG      0xff
#endif

/**
 * TCP_OVERSIZE: The maximum number of bytes that tcp_write may
 * allocate ahead of time in an attempt to create shorter pbuf chains
 * for transmission. The meaningful range is 0 to TCP_MSS. Some
 * suggested values are:
 *
 * 0:         Disable oversized allocation. Each tcp_write() allocates a new
              pbuf (old behaviour).
 * 1:         Allocate size-aligned pbufs with minimal excess. Use this if your
 *            scatter-gather DMA requires aligned fragments.
 * 128:       Limit the pbuf/memory overhead to 20%.
 * TCP_MSS:   Try to create unfragmented TCP packets.
 * TCP_MSS/4: Try to create 4 fragments or less per TCP packet.
 */
#ifndef TCP_OVERSIZE
#define TCP_OVERSIZE                    TCP_MSS
#endif

/**
 * LWIP_TCP_TIMESTAMPS==1: support the TCP timestamp option.
 */
#ifndef LWIP_TCP_TIMESTAMPS
#define LWIP_TCP_TIMESTAMPS             0
#endif

/**
 * TCP_WND_UPDATE_THRESHOLD: difference in window to trigger an
 * explicit window update
 */
#ifndef TCP_WND_UPDATE_THRESHOLD
#define TCP_WND_UPDATE_THRESHOLD   (TCP_WND / 4)
#endif

/**
 * LWIP_EVENT_API and LWIP_CALLBACK_API: Only one of these should be set to 1.
 *     LWIP_EVENT_API==1: The user defines lwip_tcp_event() to receive all
 *         events (accept, sent, etc) that happen in the system.
 *     LWIP_CALLBACK_API==1: The PCB callback function is called directly
 *         for the event.
 */
#ifndef LWIP_EVENT_API
#define LWIP_EVENT_API                  0
#define LWIP_CALLBACK_API               1
#else 
#define LWIP_EVENT_API                  1
#define LWIP_CALLBACK_API               0
#endif


/*
   ----------------------------------
   ---------- Pbuf options ----------
   ----------------------------------
*/
/**
 * PBUF_LINK_HLEN: the number of bytes that should be allocated for a
 * link level header. The default is 14, the standard value for
 * Ethernet.
 */
#ifndef PBUF_LINK_HLEN
#define PBUF_LINK_HLEN                  (14 + ETH_PAD_SIZE)
#endif

/**
 * PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. The default is
 * designed to accomodate single full size TCP frame in one pbuf, including
 * TCP_MSS, IP header, and link header.
 */
#ifndef PBUF_POOL_BUFSIZE
#define PBUF_POOL_BUFSIZE               LWIP_MEM_ALIGN_SIZE(TCP_MSS+40+PBUF_LINK_HLEN)
#endif

/*
   ------------------------------------------------
   ---------- Network Interfaces options ----------
   ------------------------------------------------
*/
/**
 * LWIP_NETIF_HOSTNAME==1: use DHCP_OPTION_HOSTNAME with netif's hostname
 * field.
 */
#ifndef LWIP_NETIF_HOSTNAME
#define LWIP_NETIF_HOSTNAME             0
#endif

/**
 * LWIP_NETIF_API==1: Support netif api (in netifapi.c)
 */
#ifndef LWIP_NETIF_API
#define LWIP_NETIF_API                  0
#endif

/**
 * LWIP_NETIF_STATUS_CALLBACK==1: Support a callback function whenever an interface
 * changes its up/down status (i.e., due to DHCP IP acquistion)
 */
#ifndef LWIP_NETIF_STATUS_CALLBACK
#define LWIP_NETIF_STATUS_CALLBACK      0
#endif

/**
 * LWIP_NETIF_LINK_CALLBACK==1: Support a callback function from an interface
 * whenever the link changes (i.e., link down)
 */
#ifndef LWIP_NETIF_LINK_CALLBACK
#define LWIP_NETIF_LINK_CALLBACK        0
#endif

/**
 * LWIP_NETIF_HWADDRHINT==1: Cache link-layer-address hints (e.g. table
 * indices) in struct netif. TCP and UDP can make use of this to prevent
 * scanning the ARP table for every sent packet. While this is faster for big
 * ARP tables or many concurrent connections, it might be counterproductive
 * if you have a tiny ARP table or if there never are concurrent connections.
 */
#ifndef LWIP_NETIF_HWADDRHINT
#define LWIP_NETIF_HWADDRHINT           0
#endif

/**
 * LWIP_NETIF_LOOPBACK==1: Support sending packets with a destination IP
 * address equal to the netif IP address, looping them back up the stack.
 */
#ifndef LWIP_NETIF_LOOPBACK
#define LWIP_NETIF_LOOPBACK             0
#endif

/**
 * LWIP_LOOPBACK_MAX_PBUFS: Maximum number of pbufs on queue for loopback
 * sending for each netif (0 = disabled)
 */
#ifndef LWIP_LOOPBACK_MAX_PBUFS
#define LWIP_LOOPBACK_MAX_PBUFS         0
#endif

/**
 * LWIP_NETIF_LOOPBACK_MULTITHREADING: Indicates whether threading is enabled in
 * the system, as netifs must change how they behave depending on this setting
 * for the LWIP_NETIF_LOOPBACK option to work.
 * Setting this is needed to avoid reentering non-reentrant functions like
 * tcp_input().
 *    LWIP_NETIF_LOOPBACK_MULTITHREADING==1: Indicates that the user is using a
 *       multithreaded environment like tcpip.c. In this case, netif->input()
 *       is called directly.
 *    LWIP_NETIF_LOOPBACK_MULTITHREADING==0: Indicates a polling (or NO_SYS) setup.
 *       The packets are put on a list and netif_poll() must be called in
 *       the main application loop.
 */
#ifndef LWIP_NETIF_LOOPBACK_MULTITHREADING
#define LWIP_NETIF_LOOPBACK_MULTITHREADING    (!NO_SYS)
#endif

/**
 * LWIP_NETIF_TX_SINGLE_PBUF: if this is set to 1, lwIP tries to put all data
 * to be sent into one single pbuf. This is for compatibility with DMA-enabled
 * MACs that do not support scatter-gather.
 * Beware that this might involve CPU-memcpy before transmitting that would not
 * be needed without this flag! Use this only if you need to!
 *
 * @todo: TCP and IP-frag do not work with this, yet:
 */
#ifndef LWIP_NETIF_TX_SINGLE_PBUF
#define LWIP_NETIF_TX_SINGLE_PBUF             0
#endif /* LWIP_NETIF_TX_SINGLE_PBUF */

/*
   ------------------------------------
   ---------- LOOPIF options ----------
   ------------------------------------
*/
/**
 * LWIP_HAVE_LOOPIF==1: Support loop interface (127.0.0.1) and loopif.c
 */
#ifndef LWIP_HAVE_LOOPIF
#define LWIP_HAVE_LOOPIF                0
#endif

/*
   ------------------------------------
   ---------- SLIPIF options ----------
   ------------------------------------
*/
/**
 * LWIP_HAVE_SLIPIF==1: Support slip interface and slipif.c
 */
#ifndef LWIP_HAVE_SLIPIF
#define LWIP_HAVE_SLIPIF                0
#endif

/*
   ------------------------------------
   ---------- Thread options ----------
   ------------------------------------
*/
/**
 * TCPIP_THREAD_NAME: The name assigned to the main tcpip thread.
 */
#ifndef TCPIP_THREAD_NAME
#define TCPIP_THREAD_NAME              "tcpip_thread"
#endif

/**
 * TCPIP_THREAD_STACKSIZE: The stack size used by the main tcpip thread.
 * The stack size value itself is platform-dependent, but is passed to
 * sys_thread_new() when the thread is created.
 */
#ifndef TCPIP_THREAD_STACKSIZE
#define TCPIP_THREAD_STACKSIZE          0
#endif

/**
 * TCPIP_THREAD_PRIO: The priority assigned to the main tcpip thread.
 * The priority value itself is platform-dependent, but is passed to
 * sys_thread_new() when the thread is created.
 */
#ifndef TCPIP_THREAD_PRIO
#define TCPIP_THREAD_PRIO               1
#endif

/**
 * TCPIP_MBOX_SIZE: The mailbox size for the tcpip thread messages
 * The queue size value itself is platform-dependent, but is passed to
 * sys_mbox_new() when tcpip_init is called.
 */
#ifndef TCPIP_MBOX_SIZE
#define TCPIP_MBOX_SIZE                 0
#endif

/**
 * SLIPIF_THREAD_NAME: The name assigned to the slipif_loop thread.
 */
#ifndef SLIPIF_THREAD_NAME
#define SLIPIF_THREAD_NAME             "slipif_loop"
#endif

/**
 * SLIP_THREAD_STACKSIZE: The stack size used by the slipif_loop thread.
 * The stack size value itself is platform-dependent, but is passed to
 * sys_thread_new() when the thread is created.
 */
#ifndef SLIPIF_THREAD_STACKSIZE
#define SLIPIF_THREAD_STACKSIZE         0
#endif

/**
 * SLIPIF_THREAD_PRIO: The priority assigned to the slipif_loop thread.
 * The priority value itself is platform-dependent, but is passed to
 * sys_thread_new() when the thread is created.
 */
#ifndef SLIPIF_THREAD_PRIO
#define SLIPIF_THREAD_PRIO              1
#endif

/**
 * PPP_THREAD_NAME: The name assigned to the pppInputThread.
 */
#ifndef PPP_THREAD_NAME
#define PPP_THREAD_NAME                "pppInputThread"
#endif

/**
 * PPP_THREAD_STACKSIZE: The stack size used by the pppInputThread.
 * The stack size value itself is platform-dependent, but is passed to
 * sys_thread_new() when the thread is created.
 */
#ifndef PPP_THREAD_STACKSIZE
#define PPP_THREAD_STACKSIZE            0
#endif

/**
 * PPP_THREAD_PRIO: The priority assigned to the pppInputThread.
 * The priority value itself is platform-dependent, but is passed to
 * sys_thread_new() when the thread is created.
 */
#ifndef PPP_THREAD_PRIO
#define PPP_THREAD_PRIO                 1
#endif

/**
 * DEFAULT_THREAD_NAME: The name assigned to any other lwIP thread.
 */
#ifndef DEFAULT_THREAD_NAME
#define DEFAULT_THREAD_NAME            "lwIP"
#endif

/**
 * DEFAULT_THREAD_STACKSIZE: The stack size used by any other lwIP thread.
 * The stack size value itself is platform-dependent, but is passed to
 * sys_thread_new() when the thread is created.
 */
#ifndef DEFAULT_THREAD_STACKSIZE
#define DEFAULT_THREAD_STACKSIZE        0
#endif

/**
 * DEFAULT_THREAD_PRIO: The priority assigned to any other lwIP thread.
 * The priority value itself is platform-dependent, but is passed to
 * sys_thread_new() when the thread is created.
 */
#ifndef DEFAULT_THREAD_PRIO
#define DEFAULT_THREAD_PRIO             1
#endif

/**
 * DEFAULT_RAW_RECVMBOX_SIZE: The mailbox size for the incoming packets on a
 * NETCONN_RAW. The queue size value itself is platform-dependent, but is passed
 * to sys_mbox_new() when the recvmbox is created.
 */
#ifndef DEFAULT_RAW_RECVMBOX_SIZE
#define DEFAULT_RAW_RECVMBOX_SIZE       0
#endif

/**
 * DEFAULT_UDP_RECVMBOX_SIZE: The mailbox size for the incoming packets on a
 * NETCONN_UDP. The queue size value itself is platform-dependent, but is passed
 * to sys_mbox_new() when the recvmbox is created.
 */
#ifndef DEFAULT_UDP_RECVMBOX_SIZE
#define DEFAULT_UDP_RECVMBOX_SIZE       0
#endif

/**
 * DEFAULT_TCP_RECVMBOX_SIZE: The mailbox size for the incoming packets on a
 * NETCONN_TCP. The queue size value itself is platform-dependent, but is passed
 * to sys_mbox_new() when the recvmbox is created.
 */
#ifndef DEFAULT_TCP_RECVMBOX_SIZE
#define DEFAULT_TCP_RECVMBOX_SIZE       0
#endif

/**
 * DEFAULT_ACCEPTMBOX_SIZE: The mailbox size for the incoming connections.
 * The queue size value itself is platform-dependent, but is passed to
 * sys_mbox_new() when the acceptmbox is created.
 */
#ifndef DEFAULT_ACCEPTMBOX_SIZE
#define DEFAULT_ACCEPTMBOX_SIZE         0
#endif

/*
   ----------------------------------------------
   ---------- Sequential layer options ----------
   ----------------------------------------------
*/
/**
 * LWIP_TCPIP_CORE_LOCKING: (EXPERIMENTAL!)
 * Don't use it if you're not an active lwIP project member
 */
#ifndef LWIP_TCPIP_CORE_LOCKING
#define LWIP_TCPIP_CORE_LOCKING         0
#endif

/**
 * LWIP_TCPIP_CORE_LOCKING_INPUT: (EXPERIMENTAL!)
 * Don't use it if you're not an active lwIP project member
 */
#ifndef LWIP_TCPIP_CORE_LOCKING_INPUT
#define LWIP_TCPIP_CORE_LOCKING_INPUT   0
#endif

/**
 * LWIP_NETCONN==1: Enable Netconn API (require to use api_lib.c)
 */
#ifndef LWIP_NETCONN
#define LWIP_NETCONN                    1
#endif

/** LWIP_TCPIP_TIMEOUT==1: Enable tcpip_timeout/tcpip_untimeout tod create
 * timers running in tcpip_thread from another thread.
 */
#ifndef LWIP_TCPIP_TIMEOUT
#define LWIP_TCPIP_TIMEOUT              1
#endif

/*
   ------------------------------------
   ---------- Socket options ----------
   ------------------------------------
*/
/**
 * LWIP_SOCKET==1: Enable Socket API (require to use sockets.c)
 */
#ifndef LWIP_SOCKET
#define LWIP_SOCKET                     1
#endif

/**
 * LWIP_COMPAT_SOCKETS==1: Enable BSD-style sockets functions names.
 * (only used if you use sockets.c)
 */
#ifndef LWIP_COMPAT_SOCKETS
#define LWIP_COMPAT_SOCKETS             1
#endif

/**
 * LWIP_POSIX_SOCKETS_IO_NAMES==1: Enable POSIX-style sockets functions names.
 * Disable this option if you use a POSIX operating system that uses the same
 * names (read, write & close). (only used if you use sockets.c)
 */
#ifndef LWIP_POSIX_SOCKETS_IO_NAMES
#define LWIP_POSIX_SOCKETS_IO_NAMES     1
#endif

/**
 * LWIP_TCP_KEEPALIVE==1: Enable TCP_KEEPIDLE, TCP_KEEPINTVL and TCP_KEEPCNT
 * options processing. Note that TCP_KEEPIDLE and TCP_KEEPINTVL have to be set
 * in seconds. (does not require sockets.c, and will affect tcp.c)
 */
#ifndef LWIP_TCP_KEEPALIVE
#define LWIP_TCP_KEEPALIVE              0
#endif

/**
 * LWIP_SO_RCVTIMEO==1: Enable SO_RCVTIMEO processing.
 */
#ifndef LWIP_SO_RCVTIMEO
#define LWIP_SO_RCVTIMEO                0
#endif

/**
 * LWIP_SO_RCVBUF==1: Enable SO_RCVBUF processing.
 */
#ifndef LWIP_SO_RCVBUF
#define LWIP_SO_RCVBUF                  0
#endif

/**
 * If LWIP_SO_RCVBUF is used, this is the default value for recv_bufsize.
 */
#ifndef RECV_BUFSIZE_DEFAULT
#define RECV_BUFSIZE_DEFAULT            INT_MAX
#endif

/**
 * SO_REUSE==1: Enable SO_REUSEADDR option.
 */
#ifndef SO_REUSE
#define SO_REUSE                        0
#endif

/**
 * SO_REUSE_RXTOALL==1: Pass a copy of incoming broadcast/multicast packets
 * to all local matches if SO_REUSEADDR is turned on.
 * WARNING: Adds a memcpy for every packet if passing to more than one pcb!
 */
#ifndef SO_REUSE_RXTOALL
#define SO_REUSE_RXTOALL                0
#endif

/*
   ----------------------------------------
   ---------- Statistics options ----------
   ----------------------------------------
*/
/**
 * LWIP_STATS==1: Enable statistics collection in lwip_stats.
 */
#ifndef LWIP_STATS
#define LWIP_STATS                      1
#endif

#if LWIP_STATS

/**
 * LWIP_STATS_DISPLAY==1: Compile in the statistics output functions.
 */
#ifndef LWIP_STATS_DISPLAY
#define LWIP_STATS_DISPLAY              0
#endif

/**
 * LINK_STATS==1: Enable link stats.
 */
#ifndef LINK_STATS
#define LINK_STATS                      1
#endif

/**
 * ETHARP_STATS==1: Enable etharp stats.
 */
#ifndef ETHARP_STATS
#define ETHARP_STATS                    (LWIP_ARP)
#endif

/**
 * IP_STATS==1: Enable IP stats.
 */
#ifndef IP_STATS
#define IP_STATS                        1
#endif

/**
 * IPFRAG_STATS==1: Enable IP fragmentation stats. Default is
 * on if using either frag or reass.
 */
#ifndef IPFRAG_STATS
#define IPFRAG_STATS                    (IP_REASSEMBLY || IP_FRAG)
#endif

/**
 * ICMP_STATS==1: Enable ICMP stats.
 */
#ifndef ICMP_STATS
#define ICMP_STATS                      1
#endif

/**
 * IGMP_STATS==1: Enable IGMP stats.
 */
#ifndef IGMP_STATS
#define IGMP_STATS                      (LWIP_IGMP)
#endif

/**
 * UDP_STATS==1: Enable UDP stats. Default is on if
 * UDP enabled, otherwise off.
 */
#ifndef UDP_STATS
#define UDP_STATS                       (LWIP_UDP)
#endif

/**
 * TCP_STATS==1: Enable TCP stats. Default is on if TCP
 * enabled, otherwise off.
 */
#ifndef TCP_STATS
#define TCP_STATS                       (LWIP_TCP)
#endif

/**
 * MEM_STATS==1: Enable mem.c stats.
 */
#ifndef MEM_STATS
#define MEM_STATS                       ((MEM_LIBC_MALLOC == 0) && (MEM_USE_POOLS == 0))
#endif

/**
 * MEMP_STATS==1: Enable memp.c pool stats.
 */
#ifndef MEMP_STATS
#define MEMP_STATS                      (MEMP_MEM_MALLOC == 0)
#endif

/**
 * SYS_STATS==1: Enable system stats (sem and mbox counts, etc).
 */
#ifndef SYS_STATS
#define SYS_STATS                       (NO_SYS == 0)
#endif

#else

#define LINK_STATS                      0
#define IP_STATS                        0
#define IPFRAG_STATS                    0
#define ICMP_STATS                      0
#define IGMP_STATS                      0
#define UDP_STATS                       0
#define TCP_STATS                       0
#define MEM_STATS                       0
#define MEMP_STATS                      0
#define SYS_STATS                       0
#define LWIP_STATS_DISPLAY              0

#endif /* LWIP_STATS */

/*
   ---------------------------------
   ---------- PPP options ----------
   ---------------------------------
*/
/**
 * PPP_SUPPORT==1: Enable PPP.
 */
#ifndef PPP_SUPPORT
#define PPP_SUPPORT                     0
#endif

/**
 * PPPOE_SUPPORT==1: Enable PPP Over Ethernet
 */
#ifndef PPPOE_SUPPORT
#define PPPOE_SUPPORT                   0
#endif

/**
 * PPPOS_SUPPORT==1: Enable PPP Over Serial
 */
#ifndef PPPOS_SUPPORT
#define PPPOS_SUPPORT                   PPP_SUPPORT
#endif

#if PPP_SUPPORT

/**
 * NUM_PPP: Max PPP sessions.
 */
#ifndef NUM_PPP
#define NUM_PPP                         1
#endif

/**
 * PAP_SUPPORT==1: Support PAP.
 */
#ifndef PAP_SUPPORT
#define PAP_SUPPORT                     0
#endif

/**
 * CHAP_SUPPORT==1: Support CHAP.
 */
#ifndef CHAP_SUPPORT
#define CHAP_SUPPORT                    0
#endif

/**
 * MSCHAP_SUPPORT==1: Support MSCHAP. CURRENTLY NOT SUPPORTED! DO NOT SET!
 */
#ifndef MSCHAP_SUPPORT
#define MSCHAP_SUPPORT                  0
#endif

/**
 * CBCP_SUPPORT==1: Support CBCP. CURRENTLY NOT SUPPORTED! DO NOT SET!
 */
#ifndef CBCP_SUPPORT
#define CBCP_SUPPORT                    0
#endif

/**
 * CCP_SUPPORT==1: Support CCP. CURRENTLY NOT SUPPORTED! DO NOT SET!
 */
#ifndef CCP_SUPPORT
#define CCP_SUPPORT                     0
#endif

/**
 * VJ_SUPPORT==1: Support VJ header compression.
 */
#ifndef VJ_SUPPORT
#define VJ_SUPPORT                      0
#endif

/**
 * MD5_SUPPORT==1: Support MD5 (see also CHAP).
 */
#ifndef MD5_SUPPORT
#define MD5_SUPPORT                     0
#endif

/*
 * Timeouts
 */
#ifndef FSM_DEFTIMEOUT
#define FSM_DEFTIMEOUT                  6       /* Timeout time in seconds */
#endif

#ifndef FSM_DEFMAXTERMREQS
#define FSM_DEFMAXTERMREQS              2       /* Maximum Terminate-Request transmissions */
#endif

#ifndef FSM_DEFMAXCONFREQS
#define FSM_DEFMAXCONFREQS              10      /* Maximum Configure-Request transmissions */
#endif

#ifndef FSM_DEFMAXNAKLOOPS
#define FSM_DEFMAXNAKLOOPS              5       /* Maximum number of nak loops */
#endif

#ifndef UPAP_DEFTIMEOUT
#define UPAP_DEFTIMEOUT                 6       /* Timeout (seconds) for retransmitting req */
#endif

#ifndef UPAP_DEFREQTIME
#define UPAP_DEFREQTIME                 30      /* Time to wait for auth-req from peer */
#endif

#ifndef CHAP_DEFTIMEOUT
#define CHAP_DEFTIMEOUT                 6       /* Timeout time in seconds */
#endif

#ifndef CHAP_DEFTRANSMITS
#define CHAP_DEFTRANSMITS               10      /* max # times to send challenge */
#endif

/* Interval in seconds between keepalive echo requests, 0 to disable. */
#ifndef LCP_ECHOINTERVAL
#define LCP_ECHOINTERVAL                0
#endif

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

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

/*
 * 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) */
#ifndef PPP_MAXMTU
/* #define PPP_MAXMTU  65535 - (PPP_HDRLEN + PPP_FCSLEN) */
#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 */
#ifndef PPP_DEFMRU
#define PPP_DEFMRU                      296             /* Try for this */
#endif
#define PPP_MINMRU                      128             /* No MRUs below this */

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

#endif /* PPP_SUPPORT */

/*
   --------------------------------------
   ---------- Checksum options ----------
   --------------------------------------
*/
/**
 * CHECKSUM_GEN_IP==1: Generate checksums in software for outgoing IP packets.
 */
#ifndef CHECKSUM_GEN_IP
#define CHECKSUM_GEN_IP                 1
#endif
 
/**
 * CHECKSUM_GEN_UDP==1: Generate checksums in software for outgoing UDP packets.
 */
#ifndef CHECKSUM_GEN_UDP
#define CHECKSUM_GEN_UDP                1
#endif
 
/**
 * CHECKSUM_GEN_TCP==1: Generate checksums in software for outgoing TCP packets.
 */
#ifndef CHECKSUM_GEN_TCP
#define CHECKSUM_GEN_TCP                1
#endif
 
/**
 * CHECKSUM_CHECK_IP==1: Check checksums in software for incoming IP packets.
 */
#ifndef CHECKSUM_CHECK_IP
#define CHECKSUM_CHECK_IP               1
#endif
 
/**
 * CHECKSUM_CHECK_UDP==1: Check checksums in software for incoming UDP packets.
 */
#ifndef CHECKSUM_CHECK_UDP
#define CHECKSUM_CHECK_UDP              1
#endif

/**
 * CHECKSUM_CHECK_TCP==1: Check checksums in software for incoming TCP packets.
 */
#ifndef CHECKSUM_CHECK_TCP
#define CHECKSUM_CHECK_TCP              1
#endif

/**
 * LWIP_CHECKSUM_ON_COPY==1: Calculate checksum when copying data from
 * application buffers to pbufs.
 */
#ifndef LWIP_CHECKSUM_ON_COPY
#define LWIP_CHECKSUM_ON_COPY           0
#endif

/*
   ---------------------------------------
   ---------- Debugging options ----------
   ---------------------------------------
*/
/**
 * LWIP_DBG_MIN_LEVEL: After masking, the value of the debug is
 * compared against this value. If it is smaller, then debugging
 * messages are written.
 */
#ifndef LWIP_DBG_MIN_LEVEL
#define LWIP_DBG_MIN_LEVEL              LWIP_DBG_LEVEL_ALL
#endif

/**
 * LWIP_DBG_TYPES_ON: A mask that can be used to globally enable/disable
 * debug messages of certain types.
 */
#ifndef LWIP_DBG_TYPES_ON
#define LWIP_DBG_TYPES_ON               LWIP_DBG_ON
#endif

/**
 * ETHARP_DEBUG: Enable debugging in etharp.c.
 */
#ifndef ETHARP_DEBUG
#define ETHARP_DEBUG                    LWIP_DBG_OFF
#endif

/**
 * NETIF_DEBUG: Enable debugging in netif.c.
 */
#ifndef NETIF_DEBUG
#define NETIF_DEBUG                     LWIP_DBG_OFF
#endif

/**
 * PBUF_DEBUG: Enable debugging in pbuf.c.
 */
#ifndef PBUF_DEBUG
#define PBUF_DEBUG                      LWIP_DBG_OFF
#endif

/**
 * API_LIB_DEBUG: Enable debugging in api_lib.c.
 */
#ifndef API_LIB_DEBUG
#define API_LIB_DEBUG                   LWIP_DBG_OFF
#endif

/**
 * API_MSG_DEBUG: Enable debugging in api_msg.c.
 */
#ifndef API_MSG_DEBUG
#define API_MSG_DEBUG                   LWIP_DBG_OFF
#endif

/**
 * SOCKETS_DEBUG: Enable debugging in sockets.c.
 */
#ifndef SOCKETS_DEBUG
#define SOCKETS_DEBUG                   LWIP_DBG_OFF
#endif

/**
 * ICMP_DEBUG: Enable debugging in icmp.c.
 */
#ifndef ICMP_DEBUG
#define ICMP_DEBUG                      LWIP_DBG_OFF
#endif

/**
 * IGMP_DEBUG: Enable debugging in igmp.c.
 */
#ifndef IGMP_DEBUG
#define IGMP_DEBUG                      LWIP_DBG_OFF
#endif

/**
 * INET_DEBUG: Enable debugging in inet.c.
 */
#ifndef INET_DEBUG
#define INET_DEBUG                      LWIP_DBG_OFF
#endif

/**
 * IP_DEBUG: Enable debugging for IP.
 */
#ifndef IP_DEBUG
#define IP_DEBUG                        LWIP_DBG_OFF
#endif

/**
 * IP_REASS_DEBUG: Enable debugging in ip_frag.c for both frag & reass.
 */
#ifndef IP_REASS_DEBUG
#define IP_REASS_DEBUG                  LWIP_DBG_OFF
#endif

/**
 * RAW_DEBUG: Enable debugging in raw.c.
 */
#ifndef RAW_DEBUG
#define RAW_DEBUG                       LWIP_DBG_OFF
#endif

/**
 * MEM_DEBUG: Enable debugging in mem.c.
 */
#ifndef MEM_DEBUG
#define MEM_DEBUG                       LWIP_DBG_OFF
#endif

/**
 * MEMP_DEBUG: Enable debugging in memp.c.
 */
#ifndef MEMP_DEBUG
#define MEMP_DEBUG                      LWIP_DBG_OFF
#endif

/**
 * SYS_DEBUG: Enable debugging in sys.c.
 */
#ifndef SYS_DEBUG
#define SYS_DEBUG                       LWIP_DBG_OFF
#endif

/**
 * TIMERS_DEBUG: Enable debugging in timers.c.
 */
#ifndef TIMERS_DEBUG
#define TIMERS_DEBUG                    LWIP_DBG_OFF
#endif

/**
 * TCP_DEBUG: Enable debugging for TCP.
 */
#ifndef TCP_DEBUG
#define TCP_DEBUG                       LWIP_DBG_OFF
#endif

/**
 * TCP_INPUT_DEBUG: Enable debugging in tcp_in.c for incoming debug.
 */
#ifndef TCP_INPUT_DEBUG
#define TCP_INPUT_DEBUG                 LWIP_DBG_OFF
#endif

/**
 * TCP_FR_DEBUG: Enable debugging in tcp_in.c for fast retransmit.
 */
#ifndef TCP_FR_DEBUG
#define TCP_FR_DEBUG                    LWIP_DBG_OFF
#endif

/**
 * TCP_RTO_DEBUG: Enable debugging in TCP for retransmit
 * timeout.
 */
#ifndef TCP_RTO_DEBUG
#define TCP_RTO_DEBUG                   LWIP_DBG_OFF
#endif

/**
 * TCP_CWND_DEBUG: Enable debugging for TCP congestion window.
 */
#ifndef TCP_CWND_DEBUG
#define TCP_CWND_DEBUG                  LWIP_DBG_OFF
#endif

/**
 * TCP_WND_DEBUG: Enable debugging in tcp_in.c for window updating.
 */
#ifndef TCP_WND_DEBUG
#define TCP_WND_DEBUG                   LWIP_DBG_OFF
#endif

/**
 * TCP_OUTPUT_DEBUG: Enable debugging in tcp_out.c output functions.
 */
#ifndef TCP_OUTPUT_DEBUG
#define TCP_OUTPUT_DEBUG                LWIP_DBG_OFF
#endif

/**
 * TCP_RST_DEBUG: Enable debugging for TCP with the RST message.
 */
#ifndef TCP_RST_DEBUG
#define TCP_RST_DEBUG                   LWIP_DBG_OFF
#endif

/**
 * TCP_QLEN_DEBUG: Enable debugging for TCP queue lengths.
 */
#ifndef TCP_QLEN_DEBUG
#define TCP_QLEN_DEBUG                  LWIP_DBG_OFF
#endif

/**
 * UDP_DEBUG: Enable debugging in UDP.
 */
#ifndef UDP_DEBUG
#define UDP_DEBUG                       LWIP_DBG_OFF
#endif

/**
 * TCPIP_DEBUG: Enable debugging in tcpip.c.
 */
#ifndef TCPIP_DEBUG
#define TCPIP_DEBUG                     LWIP_DBG_OFF
#endif

/**
 * PPP_DEBUG: Enable debugging for PPP.
 */
#ifndef PPP_DEBUG
#define PPP_DEBUG                       LWIP_DBG_OFF
#endif

/**
 * SLIP_DEBUG: Enable debugging in slipif.c.
 */
#ifndef SLIP_DEBUG
#define SLIP_DEBUG                      LWIP_DBG_OFF
#endif

/**
 * DHCP_DEBUG: Enable debugging in dhcp.c.
 */
#ifndef DHCP_DEBUG
#define DHCP_DEBUG                      LWIP_DBG_OFF
#endif

/**
 * AUTOIP_DEBUG: Enable debugging in autoip.c.
 */
#ifndef AUTOIP_DEBUG
#define AUTOIP_DEBUG                    LWIP_DBG_OFF
#endif

/**
 * SNMP_MSG_DEBUG: Enable debugging for SNMP messages.
 */
#ifndef SNMP_MSG_DEBUG
#define SNMP_MSG_DEBUG                  LWIP_DBG_OFF
#endif

/**
 * SNMP_MIB_DEBUG: Enable debugging for SNMP MIBs.
 */
#ifndef SNMP_MIB_DEBUG
#define SNMP_MIB_DEBUG                  LWIP_DBG_OFF
#endif

/**
 * DNS_DEBUG: Enable debugging for DNS.
 */
#ifndef DNS_DEBUG
#define DNS_DEBUG                       LWIP_DBG_OFF
#endif

#endif /* __LWIP_OPT_H__ */