[lwip-users] lwip_accept: Givinng error -13 on accepting connection more

/**

* @file

* lwIP Options Configuration

* 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 <address@hidden>

* NOTE: || defined __DOXYGEN__ is a workaround for doxygen bug -

* without this, doxygen does not see the actual #define

#if !defined LWIP_HDR_OPT_H

#define LWIP_HDR_OPT_H

* Include user defined options first. Anything not defined in these files

* will be set to standard values. Override anything you don't like!

#include "lwipopts.h"

#include "lwip/debug.h"

/**

* @defgroup lwip_opts Options (lwipopts.h)

* @ingroup lwip

* @defgroup lwip_opts_debug Debugging

* @ingroup lwip_opts

* @defgroup lwip_opts_infrastructure Infrastructure

* @ingroup lwip_opts

* @defgroup lwip_opts_callback Callback-style APIs

* @ingroup lwip_opts

* @defgroup lwip_opts_threadsafe_apis Thread-safe APIs

* @ingroup lwip_opts

------------------------------------

-------------- NO SYS --------------

------------------------------------

/**

* @defgroup lwip_opts_nosys NO_SYS

* @ingroup lwip_opts_infrastructure

* @{

/**

* NO_SYS==1: Use lwIP without OS-awareness (no thread, semaphores, mutexes or

* mboxes). This means threaded APIs cannot be used (socket, netconn,

* i.e. everything in the 'api' folder), only the callback-style raw API is

* available (and you have to watch out for yourself that you don't access

* lwIP functions/structures from more than one context at a time!)

#if !defined NO_SYS || defined __DOXYGEN__

#define NO_SYS 0

#endif

/**

* @}

/**

* @defgroup lwip_opts_timers Timers

* @ingroup lwip_opts_infrastructure

* @{

/**

* LWIP_TIMERS==0: Drop support for sys_timeout and lwip-internal cyclic timers.

* (the array of lwip-internal cyclic timers is still provided)

* (check NO_SYS_NO_TIMERS for compatibility to old versions)

#if !defined LWIP_TIMERS || defined __DOXYGEN__

#ifdef NO_SYS_NO_TIMERS

#define LWIP_TIMERS (!NO_SYS || (NO_SYS && !NO_SYS_NO_TIMERS))

#else

#define LWIP_TIMERS 1

#endif

/**

* LWIP_TIMERS_CUSTOM==1: Provide your own timer implementation.

* Function prototypes in timeouts.h and the array of lwip-internal cyclic timers

* are still included, but the implementation is not. The following functions

* will be required: sys_timeouts_init(), sys_timeout(), sys_untimeout(),

* sys_timeouts_mbox_fetch()

#if !defined LWIP_TIMERS_CUSTOM || defined __DOXYGEN__

#define LWIP_TIMERS_CUSTOM 0

#endif

/**

* @}

/**

* @defgroup lwip_opts_memcpy memcpy

* @ingroup lwip_opts_infrastructure

* @{

/**

* MEMCPY: override this if you have a faster implementation at hand than the

* one included in your C library

#if !defined MEMCPY || defined __DOXYGEN__

#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.

#if !defined SMEMCPY || defined __DOXYGEN__

#define SMEMCPY(dst,src,len) memcpy(dst,src,len)

#endif

/**

* MEMMOVE: override this if you have a faster implementation at hand than the

* one included in your C library. lwIP currently uses MEMMOVE only when IPv6

* fragmentation support is enabled.

#if !defined MEMMOVE || defined __DOXYGEN__

#define MEMMOVE(dst,src,len) memmove(dst,src,len)

#endif

/**

* @}

------------------------------------

----------- Core locking -----------

------------------------------------

/**

* @defgroup lwip_opts_lock Core locking and MPU

* @ingroup lwip_opts_infrastructure

* @{

/**

* LWIP_MPU_COMPATIBLE: enables special memory management mechanism

* which makes lwip able to work on MPU (Memory Protection Unit) system

* by not passing stack-pointers to other threads

* (this decreases performance as memory is allocated from pools instead

* of keeping it on the stack)

#if !defined LWIP_MPU_COMPATIBLE || defined __DOXYGEN__

#define LWIP_MPU_COMPATIBLE 0

#endif

/**

* LWIP_TCPIP_CORE_LOCKING

* Creates a global mutex that is held during TCPIP thread operations.

* Can be locked by client code to perform lwIP operations without changing

* into TCPIP thread using callbacks. See LOCK_TCPIP_CORE() and

* UNLOCK_TCPIP_CORE().

* Your system should provide mutexes supporting priority inversion to use this.

#if !defined LWIP_TCPIP_CORE_LOCKING || defined __DOXYGEN__

#define LWIP_TCPIP_CORE_LOCKING 1

#endif

/**

* LWIP_TCPIP_CORE_LOCKING_INPUT: when LWIP_TCPIP_CORE_LOCKING is enabled,

* this lets tcpip_input() grab the mutex for input packets as well,

* instead of allocating a message and passing it to tcpip_thread.

* ATTENTION: this does not work when tcpip_input() is called from

* interrupt context!

#if !defined LWIP_TCPIP_CORE_LOCKING_INPUT || defined __DOXYGEN__

#define LWIP_TCPIP_CORE_LOCKING_INPUT 0

#endif

/**

* SYS_LIGHTWEIGHT_PROT==1: enable inter-task protection (and task-vs-interrupt

* protection) for certain critical regions during buffer allocation, deallocation

* and memory allocation and deallocation.

* ATTENTION: This is required when using lwIP from more than one context! If

* you disable this, you must be sure what you are doing!

#if !defined SYS_LIGHTWEIGHT_PROT || defined __DOXYGEN__

#define SYS_LIGHTWEIGHT_PROT 1

#endif

/**

* Macro/function to check whether lwIP's threading/locking

* requirements are satisfied during current function call.

* This macro usually calls a function that is implemented in the OS-dependent

* sys layer and performs the following checks:

* - Not in ISR (this should be checked for NO_SYS==1, too!)

* - If @ref LWIP_TCPIP_CORE_LOCKING = 1: TCPIP core lock is held

* - If @ref LWIP_TCPIP_CORE_LOCKING = 0: function is called from TCPIP thread

* @see @ref multithreading

#if !defined LWIP_ASSERT_CORE_LOCKED || defined __DOXYGEN__

#define LWIP_ASSERT_CORE_LOCKED()

#endif

/**

* Called as first thing in the lwIP TCPIP thread. Can be used in conjunction

* with @ref LWIP_ASSERT_CORE_LOCKED to check core locking.

* @see @ref multithreading

#if !defined LWIP_MARK_TCPIP_THREAD || defined __DOXYGEN__

#define LWIP_MARK_TCPIP_THREAD()

#endif

/**

* @}

------------------------------------

---------- Memory options ----------

------------------------------------

/**

* @defgroup lwip_opts_mem Heap and memory pools

* @ingroup lwip_opts_infrastructure

* @{

/**

* 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.

#if !defined MEM_LIBC_MALLOC || defined __DOXYGEN__

#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 (heap alloc can be much slower than pool alloc) and usage from interrupts

* (especially if your netif driver allocates PBUF_POOL pbufs for received frames

* from interrupt)!

* ATTENTION: Currently, this uses the heap for ALL pools (also for private pools,

* not only for internal pools defined in memp_std.h)!

#if !defined MEMP_MEM_MALLOC || defined __DOXYGEN__

#define MEMP_MEM_MALLOC 0

#endif

/**

* MEMP_MEM_INIT==1: Force use of memset to initialize pool memory.

* Useful if pool are moved in uninitialized section of memory. This will ensure

* default values in pcbs struct are well initialized in all conditions.

#if !defined MEMP_MEM_INIT || defined __DOXYGEN__

#define MEMP_MEM_INIT 1

#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

#if !defined MEM_ALIGNMENT || defined __DOXYGEN__

#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.

#if !defined MEM_SIZE || defined __DOXYGEN__

#define MEM_SIZE 10000

#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!)

#if !defined MEMP_OVERFLOW_CHECK || defined __DOXYGEN__

#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.

#if !defined MEMP_SANITY_CHECK || defined __DOXYGEN__

#define MEMP_SANITY_CHECK 0

#endif

/**

* MEM_OVERFLOW_CHECK: mem overflow protection reserves a configurable

* amount of bytes before and after each heap allocation chunk and fills

* it with a prominent default value.

* MEM_OVERFLOW_CHECK == 0 no checking

* MEM_OVERFLOW_CHECK == 1 checks each element when it is freed

* MEM_OVERFLOW_CHECK >= 2 checks all heap elements every time

* mem_malloc() or mem_free() is called (useful but slow!)

#if !defined MEM_OVERFLOW_CHECK || defined __DOXYGEN__

#define MEM_OVERFLOW_CHECK 0

#endif

/**

* MEM_SANITY_CHECK==1: run a sanity check after each mem_free() to make

* sure that the linked list of heap elements is not corrupted.

#if !defined MEM_SANITY_CHECK || defined __DOXYGEN__

#define MEM_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.

#if !defined MEM_USE_POOLS || defined __DOXYGEN__

#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. */

#if !defined MEM_USE_POOLS_TRY_BIGGER_POOL || defined __DOXYGEN__

#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

* include path somewhere.

#if !defined MEMP_USE_CUSTOM_POOLS || defined __DOXYGEN__

#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);

#if !defined LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT || defined __DOXYGEN__

#define LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT 0

#endif

/**

* @}

------------------------------------------------

---------- Internal Memory Pool Sizes ----------

------------------------------------------------

/**

* @defgroup lwip_opts_memp Internal memory pools

* @ingroup lwip_opts_infrastructure

* @{

/**

* 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.

#if !defined MEMP_NUM_PBUF || defined __DOXYGEN__

#define MEMP_NUM_PBUF 50

#endif

/**

* MEMP_NUM_RAW_PCB: Number of raw connection PCBs

* (requires the LWIP_RAW option)

#if !defined MEMP_NUM_RAW_PCB || defined __DOXYGEN__

#define MEMP_NUM_RAW_PCB 40

#endif

/**

* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One

* per active UDP "connection".

* (requires the LWIP_UDP option)

#if !defined MEMP_NUM_UDP_PCB || defined __DOXYGEN__

#define MEMP_NUM_UDP_PCB 4

#endif

/**

* MEMP_NUM_TCP_PCB: the number of simultaneously active TCP connections.

* (requires the LWIP_TCP option)

#if !defined MEMP_NUM_TCP_PCB || defined __DOXYGEN__

#define MEMP_NUM_TCP_PCB 200

#endif

/**

* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP connections.

* (requires the LWIP_TCP option)

#if !defined MEMP_NUM_TCP_PCB_LISTEN || defined __DOXYGEN__

#define MEMP_NUM_TCP_PCB_LISTEN 50

#endif

/**

* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP segments.

* (requires the LWIP_TCP option)

#if !defined MEMP_NUM_TCP_SEG || defined __DOXYGEN__

#define MEMP_NUM_TCP_SEG 40

#endif

/**

* MEMP_NUM_ALTCP_PCB: the number of simultaneously active altcp layer pcbs.

* (requires the LWIP_ALTCP option)

* Connections with multiple layers require more than one altcp_pcb (e.g. TLS

* over TCP requires 2 altcp_pcbs, one for TLS and one for TCP).

#if !defined MEMP_NUM_ALTCP_PCB || defined __DOXYGEN__

#define MEMP_NUM_ALTCP_PCB MEMP_NUM_TCP_PCB

#endif

/**

* MEMP_NUM_REASSDATA: the number of IP packets simultaneously queued for

* reassembly (whole packets, not fragments!)

#if !defined MEMP_NUM_REASSDATA || defined __DOXYGEN__

#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 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.

#if !defined MEMP_NUM_FRAG_PBUF || defined __DOXYGEN__

#define MEMP_NUM_FRAG_PBUF 15

#endif

/**

* MEMP_NUM_ARP_QUEUE: the number of simultaneously queued outgoing

* packets (pbufs) that are waiting for an ARP request (to resolve

* their destination address) to finish.

* (requires the ARP_QUEUEING option)

#if !defined MEMP_NUM_ARP_QUEUE || defined __DOXYGEN__

#define MEMP_NUM_ARP_QUEUE 30

#endif

/**

* MEMP_NUM_IGMP_GROUP: The number of multicast groups whose network interfaces

* can be members at the same time (one per netif - allsystems group -, plus one

* per netif membership).

* (requires the LWIP_IGMP option)

#if !defined MEMP_NUM_IGMP_GROUP || defined __DOXYGEN__

#define MEMP_NUM_IGMP_GROUP 8

#endif

/**

* The number of sys timeouts used by the core stack (not apps)

* The default number of timeouts is calculated here for all enabled modules.

#define LWIP_NUM_SYS_TIMEOUT_INTERNAL (LWIP_TCP + IP_REASSEMBLY + LWIP_ARP + (2*LWIP_DHCP) + LWIP_AUTOIP + LWIP_IGMP + LWIP_DNS + PPP_NUM_TIMEOUTS + (LWIP_IPV6 * (1 + LWIP_IPV6_REASS + LWIP_IPV6_MLD)))

/**

* MEMP_NUM_SYS_TIMEOUT: the number of simultaneously active timeouts.

* The default number of timeouts is calculated here for all enabled modules.

* The formula expects settings to be either '0' or '1'.

#if !defined MEMP_NUM_SYS_TIMEOUT || defined __DOXYGEN__

#define MEMP_NUM_SYS_TIMEOUT LWIP_NUM_SYS_TIMEOUT_INTERNAL

#endif

/**

* MEMP_NUM_NETBUF: the number of struct netbufs.

* (only needed if you use the sequential API, like api_lib.c)

#if !defined MEMP_NUM_NETBUF || defined __DOXYGEN__

#define MEMP_NUM_NETBUF 200

#endif

/**

* MEMP_NUM_NETCONN: the number of struct netconns.

* (only needed if you use the sequential API, like api_lib.c)

#if !defined MEMP_NUM_NETCONN || defined __DOXYGEN__

#define MEMP_NUM_NETCONN 200

#endif

/**

* MEMP_NUM_SELECT_CB: the number of struct lwip_select_cb.

* (Only needed if you have LWIP_MPU_COMPATIBLE==1 and use the socket API.

* In that case, you need one per thread calling lwip_select.)

#if !defined MEMP_NUM_SELECT_CB || defined __DOXYGEN__

#define MEMP_NUM_SELECT_CB 50

#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)

#if !defined MEMP_NUM_TCPIP_MSG_API || defined __DOXYGEN__

#define MEMP_NUM_TCPIP_MSG_API 50

#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)

#if !defined MEMP_NUM_TCPIP_MSG_INPKT || defined __DOXYGEN__

#define MEMP_NUM_TCPIP_MSG_INPKT 50

#endif

/**

* MEMP_NUM_NETDB: the number of concurrently running lwip_addrinfo() calls

* (before freeing the corresponding memory using lwip_freeaddrinfo()).

#if !defined MEMP_NUM_NETDB || defined __DOXYGEN__

#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.

#if !defined MEMP_NUM_LOCALHOSTLIST || defined __DOXYGEN__

#define MEMP_NUM_LOCALHOSTLIST 1

#endif

/**

* PBUF_POOL_SIZE: the number of buffers in the pbuf pool.

#if !defined PBUF_POOL_SIZE || defined __DOXYGEN__

#define PBUF_POOL_SIZE 16

#endif

/** MEMP_NUM_API_MSG: the number of concurrently active calls to various

* socket, netconn, and tcpip functions

#if !defined MEMP_NUM_API_MSG || defined __DOXYGEN__

#define MEMP_NUM_API_MSG MEMP_NUM_TCPIP_MSG_API

#endif

/** MEMP_NUM_DNS_API_MSG: the number of concurrently active calls to netconn_gethostbyname

#if !defined MEMP_NUM_DNS_API_MSG || defined __DOXYGEN__

#define MEMP_NUM_DNS_API_MSG MEMP_NUM_TCPIP_MSG_API

#endif

/** MEMP_NUM_SOCKET_SETGETSOCKOPT_DATA: the number of concurrently active calls

* to getsockopt/setsockopt

#if !defined MEMP_NUM_SOCKET_SETGETSOCKOPT_DATA || defined __DOXYGEN__

#define MEMP_NUM_SOCKET_SETGETSOCKOPT_DATA MEMP_NUM_TCPIP_MSG_API

#endif

/** MEMP_NUM_NETIFAPI_MSG: the number of concurrently active calls to the

* netifapi functions

#if !defined MEMP_NUM_NETIFAPI_MSG || defined __DOXYGEN__

#define MEMP_NUM_NETIFAPI_MSG MEMP_NUM_TCPIP_MSG_API

#endif

/**

* @}

---------------------------------

---------- ARP options ----------

---------------------------------

/**

* @defgroup lwip_opts_arp ARP

* @ingroup lwip_opts_ipv4

* @{

/**

* LWIP_ARP==1: Enable ARP functionality.

#if !defined LWIP_ARP || defined __DOXYGEN__

#define LWIP_ARP 1

#endif

/**

* ARP_TABLE_SIZE: Number of active MAC-IP address pairs cached.

#if !defined ARP_TABLE_SIZE || defined __DOXYGEN__

#define ARP_TABLE_SIZE 10

#endif

/** the time an ARP entry stays valid after its last update,

* for ARP_TMR_INTERVAL = 1000, this is

* (60 * 5) seconds = 5 minutes.

#if !defined ARP_MAXAGE || defined __DOXYGEN__

#define ARP_MAXAGE 300

#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.

#if !defined ARP_QUEUEING || defined __DOXYGEN__

#define ARP_QUEUEING 0

#endif

/** The maximum number of packets which may be queued for each

* unresolved address by other network layers. Defaults to 3, 0 means disabled.

* Old packets are dropped, new packets are queued.

#if !defined ARP_QUEUE_LEN || defined __DOXYGEN__

#define ARP_QUEUE_LEN 16

#endif

/**

* ETHARP_SUPPORT_VLAN==1: support receiving and sending ethernet packets with

* VLAN header. See the description of LWIP_HOOK_VLAN_CHECK and

* LWIP_HOOK_VLAN_SET hooks to check/set VLAN headers.

* 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.

* Alternatively, define a function/define ETHARP_VLAN_CHECK_FN(eth_hdr, vlan)

* that returns 1 to accept a packet or 0 to drop a packet.

#if !defined ETHARP_SUPPORT_VLAN || defined __DOXYGEN__

#define ETHARP_SUPPORT_VLAN 0

#endif

/** LWIP_ETHERNET==1: enable ethernet support even though ARP might be disabled

#if !defined LWIP_ETHERNET || defined __DOXYGEN__

#define LWIP_ETHERNET LWIP_ARP

#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.

#if !defined ETH_PAD_SIZE || defined __DOXYGEN__

#define ETH_PAD_SIZE 2

#endif

/** ETHARP_SUPPORT_STATIC_ENTRIES==1: enable code to support static ARP table

* entries (using etharp_add_static_entry/etharp_remove_static_entry).

#if !defined ETHARP_SUPPORT_STATIC_ENTRIES || defined __DOXYGEN__

#define ETHARP_SUPPORT_STATIC_ENTRIES 0

#endif

/** ETHARP_TABLE_MATCH_NETIF==1: Match netif for ARP table entries.

* If disabled, duplicate IP address on multiple netifs are not supported

* (but this should only occur for AutoIP).

#if !defined ETHARP_TABLE_MATCH_NETIF || defined __DOXYGEN__

#define ETHARP_TABLE_MATCH_NETIF !LWIP_SINGLE_NETIF

#endif

/**

* @}

--------------------------------

---------- IP options ----------

--------------------------------

/**

* @defgroup lwip_opts_ipv4 IPv4

* @ingroup lwip_opts

* @{

/**

* LWIP_IPV4==1: Enable IPv4

#if !defined LWIP_IPV4 || defined __DOXYGEN__

#define LWIP_IPV4 1

#endif

/**

* 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.

#if !defined IP_FORWARD || defined __DOXYGEN__

#define IP_FORWARD 0

#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.

#if !defined IP_REASSEMBLY || defined __DOXYGEN__

#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.

#if !defined IP_FRAG || defined __DOXYGEN__

#define IP_FRAG 1

#endif

#if !LWIP_IPV4

/* disable IPv4 extensions when IPv4 is disabled */

#undef IP_FORWARD

#define IP_FORWARD 0

#undef IP_REASSEMBLY

#define IP_REASSEMBLY 0

#undef IP_FRAG

#define IP_FRAG 0

#endif /* !LWIP_IPV4 */

/**

* 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).

#if !defined IP_OPTIONS_ALLOWED || defined __DOXYGEN__

#define IP_OPTIONS_ALLOWED 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.

#if !defined IP_REASS_MAXAGE || defined __DOXYGEN__

#define IP_REASS_MAXAGE 15

#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!

* When IPv4 *and* IPv6 are enabled, this even changes to

* (PBUF_POOL_SIZE > 2 * IP_REASS_MAX_PBUFS)!

#if !defined IP_REASS_MAX_PBUFS || defined __DOXYGEN__

#define IP_REASS_MAX_PBUFS 10

#endif

/**

* IP_DEFAULT_TTL: Default value for Time-To-Live used by transport layers.

#if !defined IP_DEFAULT_TTL || defined __DOXYGEN__

#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.

#if !defined IP_SOF_BROADCAST || defined __DOXYGEN__

#define IP_SOF_BROADCAST 0

#endif

/**

* IP_SOF_BROADCAST_RECV (requires IP_SOF_BROADCAST=1) enable the broadcast

* filter on recv operations.

#if !defined IP_SOF_BROADCAST_RECV || defined __DOXYGEN__

#define IP_SOF_BROADCAST_RECV 0

#endif

/**

* IP_FORWARD_ALLOW_TX_ON_RX_NETIF==1: allow ip_forward() to send packets back

* out on the netif where it was received. This should only be used for

* wireless networks.

* ATTENTION: When this is 1, make sure your netif driver correctly marks incoming

* link-layer-broadcast/multicast packets as such using the corresponding pbuf flags!

#if !defined IP_FORWARD_ALLOW_TX_ON_RX_NETIF || defined __DOXYGEN__

#define IP_FORWARD_ALLOW_TX_ON_RX_NETIF 0

#endif

/**

* @}

----------------------------------

---------- ICMP options ----------

----------------------------------

/**

* @defgroup lwip_opts_icmp ICMP

* @ingroup lwip_opts_ipv4

* @{

/**

* LWIP_ICMP==1: Enable ICMP module inside the IP stack.

* Be careful, disable that make your product non-compliant to RFC1122

#if !defined LWIP_ICMP || defined __DOXYGEN__

#define LWIP_ICMP 1

#endif

/**

* ICMP_TTL: Default value for Time-To-Live used by ICMP packets.

#if !defined ICMP_TTL || defined __DOXYGEN__

#define ICMP_TTL IP_DEFAULT_TTL

#endif

/**

* LWIP_BROADCAST_PING==1: respond to broadcast pings (default is unicast only)

#if !defined LWIP_BROADCAST_PING || defined __DOXYGEN__

#define LWIP_BROADCAST_PING 0

#endif

/**

* LWIP_MULTICAST_PING==1: respond to multicast pings (default is unicast only)

#if !defined LWIP_MULTICAST_PING || defined __DOXYGEN__

#define LWIP_MULTICAST_PING 0

#endif

/**

* @}

---------------------------------

---------- RAW options ----------

---------------------------------

/**

* @defgroup lwip_opts_raw RAW

* @ingroup lwip_opts_callback

* @{

/**

* LWIP_RAW==1: Enable application layer to hook into the IP layer itself.

#if !defined LWIP_RAW || defined __DOXYGEN__

#define LWIP_RAW 0

#endif

/**

* LWIP_RAW==1: Enable application layer to hook into the IP layer itself.

#if !defined RAW_TTL || defined __DOXYGEN__

#define RAW_TTL IP_DEFAULT_TTL

#endif

/**

* @}

----------------------------------

---------- DHCP options ----------

----------------------------------

/**

* @defgroup lwip_opts_dhcp DHCP

* @ingroup lwip_opts_ipv4

* @{

/**

* LWIP_DHCP==1: Enable DHCP module.

#if !defined LWIP_DHCP || defined __DOXYGEN__

#define LWIP_DHCP 0

#endif

#if !LWIP_IPV4

/* disable DHCP when IPv4 is disabled */

#undef LWIP_DHCP

#define LWIP_DHCP 0

#endif /* !LWIP_IPV4 */

/**

* DHCP_DOES_ARP_CHECK==1: Do an ARP check on the offered address.

#if !defined DHCP_DOES_ARP_CHECK || defined __DOXYGEN__

#define DHCP_DOES_ARP_CHECK (LWIP_DHCP && LWIP_ARP)

#endif

/**

* LWIP_DHCP_BOOTP_FILE==1: Store offered_si_addr and boot_file_name.

#if !defined LWIP_DHCP_BOOTP_FILE || defined __DOXYGEN__

#define LWIP_DHCP_BOOTP_FILE 0

#endif

/**

* LWIP_DHCP_GETS_NTP==1: Request NTP servers with discover/select. For each

* response packet, an callback is called, which has to be provided by the port:

* void dhcp_set_ntp_servers(u8_t num_ntp_servers, ip_addr_t* ntp_server_addrs);

#if !defined LWIP_DHCP_GET_NTP_SRV || defined __DOXYGEN__

#define LWIP_DHCP_GET_NTP_SRV 0

#endif

/**

* The maximum of NTP servers requested

#if !defined LWIP_DHCP_MAX_NTP_SERVERS || defined __DOXYGEN__

#define LWIP_DHCP_MAX_NTP_SERVERS 1

#endif

/**

* LWIP_DHCP_MAX_DNS_SERVERS > 0: Request DNS servers with discover/select.

* DNS servers received in the response are passed to DNS via @ref dns_setserver()

* (up to the maximum limit defined here).

#if !defined LWIP_DHCP_MAX_DNS_SERVERS || defined __DOXYGEN__

#define LWIP_DHCP_MAX_DNS_SERVERS DNS_MAX_SERVERS

#endif

/**

* @}

------------------------------------

---------- AUTOIP options ----------

------------------------------------

/**

* @defgroup lwip_opts_autoip AUTOIP

* @ingroup lwip_opts_ipv4

* @{

/**

* LWIP_AUTOIP==1: Enable AUTOIP module.

#if !defined LWIP_AUTOIP || defined __DOXYGEN__

#define LWIP_AUTOIP 0

#endif

#if !LWIP_IPV4

/* disable AUTOIP when IPv4 is disabled */

#undef LWIP_AUTOIP

#define LWIP_AUTOIP 0

#endif /* !LWIP_IPV4 */

/**

* LWIP_DHCP_AUTOIP_COOP==1: Allow DHCP and AUTOIP to be both enabled on

* the same interface at the same time.

#if !defined LWIP_DHCP_AUTOIP_COOP || defined __DOXYGEN__

#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 (the DHCP client keeps

* running in this case). 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.

#if !defined LWIP_DHCP_AUTOIP_COOP_TRIES || defined __DOXYGEN__

#define LWIP_DHCP_AUTOIP_COOP_TRIES 9

#endif

/**

* @}

----------------------------------

----- SNMP MIB2 support -----

----------------------------------

/**

* @defgroup lwip_opts_mib2 SNMP MIB2 callbacks

* @ingroup lwip_opts_infrastructure

* @{

/**

* LWIP_MIB2_CALLBACKS==1: Turn on SNMP MIB2 callbacks.

* Turn this on to get callbacks needed to implement MIB2.

* Usually MIB2_STATS should be enabled, too.

#if !defined LWIP_MIB2_CALLBACKS || defined __DOXYGEN__

#define LWIP_MIB2_CALLBACKS 0

#endif

/**

* @}

----------------------------------

-------- Multicast options -------

----------------------------------

/**

* @defgroup lwip_opts_multicast Multicast

* @ingroup lwip_opts_infrastructure

* @{

/**

* LWIP_MULTICAST_TX_OPTIONS==1: Enable multicast TX support like the socket options

* IP_MULTICAST_TTL/IP_MULTICAST_IF/IP_MULTICAST_LOOP, as well as (currently only)

* core support for the corresponding IPv6 options.

#if !defined LWIP_MULTICAST_TX_OPTIONS || defined __DOXYGEN__

#define LWIP_MULTICAST_TX_OPTIONS ((LWIP_IGMP || LWIP_IPV6_MLD) && (LWIP_UDP || LWIP_RAW))

#endif

/**

* @}

----------------------------------

---------- IGMP options ----------

----------------------------------

/**

* @defgroup lwip_opts_igmp IGMP

* @ingroup lwip_opts_ipv4

* @{

/**

* LWIP_IGMP==1: Turn on IGMP module.

#if !defined LWIP_IGMP || defined __DOXYGEN__

#define LWIP_IGMP 1

#endif

#if !LWIP_IPV4

#undef LWIP_IGMP

#define LWIP_IGMP 0

#endif

/**

* @}

----------------------------------

---------- DNS options -----------

----------------------------------

/**

* @defgroup lwip_opts_dns DNS

* @ingroup lwip_opts_callback

* @{

/**

* LWIP_DNS==1: Turn on DNS module. UDP must be available for DNS

* transport.

#if !defined LWIP_DNS || defined __DOXYGEN__

#define LWIP_DNS 0

#endif

/** DNS maximum number of entries to maintain locally. */

#if !defined DNS_TABLE_SIZE || defined __DOXYGEN__

#define DNS_TABLE_SIZE 4

#endif

/** DNS maximum host name length supported in the name table. */

#if !defined DNS_MAX_NAME_LENGTH || defined __DOXYGEN__

#define DNS_MAX_NAME_LENGTH 256

#endif

/** The maximum of DNS servers

* The first server can be initialized automatically by defining

* DNS_SERVER_ADDRESS(ipaddr), where 'ipaddr' is an 'ip_addr_t*'

#if !defined DNS_MAX_SERVERS || defined __DOXYGEN__

#define DNS_MAX_SERVERS 2

#endif

/** DNS maximum number of retries when asking for a name, before "timeout". */

#if !defined DNS_MAX_RETRIES || defined __DOXYGEN__

#define DNS_MAX_RETRIES 4

#endif

/** DNS do a name checking between the query and the response. */

#if !defined DNS_DOES_NAME_CHECK || defined __DOXYGEN__

#define DNS_DOES_NAME_CHECK 1

#endif

/** LWIP_DNS_SECURE: controls the security level of the DNS implementation

* Use all DNS security features by default.

* This is overridable but should only be needed by very small targets

* or when using against non standard DNS servers. */

#if !defined LWIP_DNS_SECURE || defined __DOXYGEN__

#define LWIP_DNS_SECURE (LWIP_DNS_SECURE_RAND_XID | LWIP_DNS_SECURE_NO_MULTIPLE_OUTSTANDING | LWIP_DNS_SECURE_RAND_SRC_PORT)

#endif

/* A list of DNS security features follows */

#define LWIP_DNS_SECURE_RAND_XID 1

#define LWIP_DNS_SECURE_NO_MULTIPLE_OUTSTANDING 2

#define LWIP_DNS_SECURE_RAND_SRC_PORT 4

/** DNS_LOCAL_HOSTLIST: Implements a local host-to-address list. If enabled, you have to define an initializer:

* \#define DNS_LOCAL_HOSTLIST_INIT {DNS_LOCAL_HOSTLIST_ELEM("host_ip4", IPADDR4_INIT_BYTES(1,2,3,4)), \

* DNS_LOCAL_HOSTLIST_ELEM("host_ip6", IPADDR6_INIT_HOST(123, 234, 345, 456)}

* Instead, you can also use an external function:

* \#define DNS_LOOKUP_LOCAL_EXTERN(x) extern err_t my_lookup_function(const char *name, ip_addr_t *addr, u8_t dns_addrtype)

* that looks up the IP address and returns ERR_OK if found (LWIP_DNS_ADDRTYPE_xxx is passed in dns_addrtype).

#if !defined DNS_LOCAL_HOSTLIST || defined __DOXYGEN__

#define DNS_LOCAL_HOSTLIST 0

#endif /* DNS_LOCAL_HOSTLIST */

/** If this is turned on, the local host-list can be dynamically changed

* at runtime. */

#if !defined DNS_LOCAL_HOSTLIST_IS_DYNAMIC || defined __DOXYGEN__

#define DNS_LOCAL_HOSTLIST_IS_DYNAMIC 0

#endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */

/** Set this to 1 to enable querying ".local" names via mDNS

* using a One-Shot Multicast DNS Query */

#if !defined LWIP_DNS_SUPPORT_MDNS_QUERIES || defined __DOXYGEN__

#define LWIP_DNS_SUPPORT_MDNS_QUERIES 0

#endif

/**

* @}

---------------------------------

---------- UDP options ----------

---------------------------------

/**

* @defgroup lwip_opts_udp UDP

* @ingroup lwip_opts_callback

* @{

/**

* LWIP_UDP==1: Turn on UDP.

#if !defined LWIP_UDP || defined __DOXYGEN__

#define LWIP_UDP 1

#endif

/**

* LWIP_UDPLITE==1: Turn on UDP-Lite. (Requires LWIP_UDP)

#if !defined LWIP_UDPLITE || defined __DOXYGEN__

#define LWIP_UDPLITE 0

#endif

/**

* UDP_TTL: Default Time-To-Live value.

#if !defined UDP_TTL || defined __DOXYGEN__

#define UDP_TTL IP_DEFAULT_TTL

#endif

/**

* LWIP_NETBUF_RECVINFO==1: append destination addr and port to every netbuf.

#if !defined LWIP_NETBUF_RECVINFO || defined __DOXYGEN__

#define LWIP_NETBUF_RECVINFO 0

#endif

/**

* @}

---------------------------------

---------- TCP options ----------

---------------------------------

/**

* @defgroup lwip_opts_tcp TCP

* @ingroup lwip_opts_callback

* @{

/**

* LWIP_TCP==1: Turn on TCP.

#if !defined LWIP_TCP || defined __DOXYGEN__

#define LWIP_TCP 1

#endif

/**

* TCP_TTL: Default Time-To-Live value.

#if !defined TCP_TTL || defined __DOXYGEN__

#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.

* ATTENTION: when using TCP_RCV_SCALE, TCP_WND is the total size

* with scaling applied. Maximum window value in the TCP header

* will be TCP_WND >> TCP_RCV_SCALE

#if !defined TCP_WND || defined __DOXYGEN__

#define TCP_WND (4 * TCP_MSS)

#endif

/**

* TCP_MAXRTX: Maximum number of retransmissions of data segments.

#if !defined TCP_MAXRTX || defined __DOXYGEN__

#define TCP_MAXRTX 12

#endif

/**

* TCP_SYNMAXRTX: Maximum number of retransmissions of SYN segments.

#if !defined TCP_SYNMAXRTX || defined __DOXYGEN__

#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.

#if !defined TCP_QUEUE_OOSEQ || defined __DOXYGEN__

#define TCP_QUEUE_OOSEQ LWIP_TCP

#endif

/**

* LWIP_TCP_SACK_OUT==1: TCP will support sending selective acknowledgements (SACKs).

#if !defined LWIP_TCP_SACK_OUT || defined __DOXYGEN__

#define LWIP_TCP_SACK_OUT 0

#endif

/**

* LWIP_TCP_MAX_SACK_NUM: The maximum number of SACK values to include in TCP segments.

* Must be at least 1, but is only used if LWIP_TCP_SACK_OUT is enabled.

* NOTE: Even though we never send more than 3 or 4 SACK ranges in a single segment

* (depending on other options), setting this option to values greater than 4 is not pointless.

* This is basically the max number of SACK ranges we want to keep track of.

* As new data is delivered, some of the SACK ranges may be removed or merged.

* In that case some of those older SACK ranges may be used again.

* The amount of memory used to store SACK ranges is LWIP_TCP_MAX_SACK_NUM * 8 bytes for each TCP PCB.

#if !defined LWIP_TCP_MAX_SACK_NUM || defined __DOXYGEN__

#define LWIP_TCP_MAX_SACK_NUM 4

#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.

#if !defined TCP_MSS || defined __DOXYGEN__

#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.

#if !defined TCP_CALCULATE_EFF_SEND_MSS || defined __DOXYGEN__

#define TCP_CALCULATE_EFF_SEND_MSS 1

#endif

/**

* TCP_SND_BUF: TCP sender buffer space (bytes).

* To achieve good performance, this should be at least 2 * TCP_MSS.

#if !defined TCP_SND_BUF || defined __DOXYGEN__

#define TCP_SND_BUF (2 * TCP_MSS)

#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.

#if !defined TCP_SND_QUEUELEN || defined __DOXYGEN__

#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).

#if !defined TCP_SNDLOWAT || defined __DOXYGEN__

#define TCP_SNDLOWAT LWIP_MIN(LWIP_MAX(((TCP_SND_BUF)/2), (2 * TCP_MSS) + 1), (TCP_SND_BUF) - 1)

#endif

/**

* TCP_SNDQUEUELOWAT: TCP writable bufs (pbuf count). This must be less

* than TCP_SND_QUEUELEN. If the number of pbufs queued on a pcb drops below

* this number, select returns writable (combined with TCP_SNDLOWAT).

#if !defined TCP_SNDQUEUELOWAT || defined __DOXYGEN__

#define TCP_SNDQUEUELOWAT LWIP_MAX(((TCP_SND_QUEUELEN)/2), 5)

#endif

/**

* TCP_OOSEQ_MAX_BYTES: The default maximum number of bytes queued on ooseq per

* pcb if TCP_OOSEQ_BYTES_LIMIT is not defined. Default is 0 (no limit).

* Only valid for TCP_QUEUE_OOSEQ==1.

#if !defined TCP_OOSEQ_MAX_BYTES || defined __DOXYGEN__

#define TCP_OOSEQ_MAX_BYTES 0

#endif

/**

* TCP_OOSEQ_BYTES_LIMIT(pcb): Return the maximum number of bytes to be queued

* on ooseq per pcb, given the pcb. Only valid for TCP_QUEUE_OOSEQ==1 &&

* TCP_OOSEQ_MAX_BYTES==1.

* Use this to override TCP_OOSEQ_MAX_BYTES to a dynamic value per pcb.

#if !defined TCP_OOSEQ_BYTES_LIMIT

#if TCP_OOSEQ_MAX_BYTES

#define TCP_OOSEQ_BYTES_LIMIT(pcb) TCP_OOSEQ_MAX_BYTES

#elif defined __DOXYGEN__

#define TCP_OOSEQ_BYTES_LIMIT(pcb)

#endif

/**

* TCP_OOSEQ_MAX_PBUFS: The default maximum number of pbufs queued on ooseq per

* pcb if TCP_OOSEQ_BYTES_LIMIT is not defined. Default is 0 (no limit).

* Only valid for TCP_QUEUE_OOSEQ==1.

#if !defined TCP_OOSEQ_MAX_PBUFS || defined __DOXYGEN__

#define TCP_OOSEQ_MAX_PBUFS 0

#endif

/**

* TCP_OOSEQ_PBUFS_LIMIT(pcb): Return the maximum number of pbufs to be queued

* on ooseq per pcb, given the pcb. Only valid for TCP_QUEUE_OOSEQ==1 &&

* TCP_OOSEQ_MAX_PBUFS==1.

* Use this to override TCP_OOSEQ_MAX_PBUFS to a dynamic value per pcb.

#if !defined TCP_OOSEQ_PBUFS_LIMIT

#if TCP_OOSEQ_MAX_PBUFS

#define TCP_OOSEQ_PBUFS_LIMIT(pcb) TCP_OOSEQ_MAX_PBUFS

#elif defined __DOXYGEN__

#define TCP_OOSEQ_PBUFS_LIMIT(pcb)

#endif

/**

* TCP_LISTEN_BACKLOG: Enable the backlog option for tcp listen pcb.

#if !defined TCP_LISTEN_BACKLOG || defined __DOXYGEN__

#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).

#if !defined TCP_DEFAULT_LISTEN_BACKLOG || defined __DOXYGEN__

#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.

#if !defined TCP_OVERSIZE || defined __DOXYGEN__

#define TCP_OVERSIZE TCP_MSS

#endif

/**

* LWIP_TCP_TIMESTAMPS==1: support the TCP timestamp option.

* The timestamp option is currently only used to help remote hosts, it is not

* really used locally. Therefore, it is only enabled when a TS option is

* received in the initial SYN packet from a remote host.

#if !defined LWIP_TCP_TIMESTAMPS || defined __DOXYGEN__

#define LWIP_TCP_TIMESTAMPS 0

#endif

/**

* TCP_WND_UPDATE_THRESHOLD: difference in window to trigger an

* explicit window update

#if !defined TCP_WND_UPDATE_THRESHOLD || defined __DOXYGEN__

#define TCP_WND_UPDATE_THRESHOLD LWIP_MIN((TCP_WND / 4), (TCP_MSS * 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. This is the default.

#if !defined(LWIP_EVENT_API) && !defined(LWIP_CALLBACK_API) || defined __DOXYGEN__

#define LWIP_EVENT_API 0

#define LWIP_CALLBACK_API 1

#else

#ifndef LWIP_EVENT_API

#define LWIP_EVENT_API 0

#endif

#ifndef LWIP_CALLBACK_API

#define LWIP_CALLBACK_API 0

#endif

/**

* LWIP_WND_SCALE and TCP_RCV_SCALE:

* Set LWIP_WND_SCALE to 1 to enable window scaling.

* Set TCP_RCV_SCALE to the desired scaling factor (shift count in the

* range of [0..14]).

* When LWIP_WND_SCALE is enabled but TCP_RCV_SCALE is 0, we can use a large

* send window while having a small receive window only.

#if !defined LWIP_WND_SCALE || defined __DOXYGEN__

#define LWIP_WND_SCALE 0

#define TCP_RCV_SCALE 0

#endif

/**

* LWIP_TCP_PCB_NUM_EXT_ARGS:

* When this is > 0, every tcp pcb (including listen pcb) includes a number of

* additional argument entries in an array (see tcp_ext_arg_alloc_id)

#if !defined LWIP_TCP_PCB_NUM_EXT_ARGS || defined __DOXYGEN__

#define LWIP_TCP_PCB_NUM_EXT_ARGS 0

#endif

/** LWIP_ALTCP==1: enable the altcp API.

* altcp is an abstraction layer that prevents applications linking against the

* tcp.h functions but provides the same functionality. It is used to e.g. add

* SSL/TLS or proxy-connect support to an application written for the tcp callback

* API without that application knowing the protocol details.

* With LWIP_ALTCP==0, applications written against the altcp API can still be

* compiled but are directly linked against the tcp.h callback API and then

* cannot use layered protocols.

* See @ref altcp_api

#if !defined LWIP_ALTCP || defined __DOXYGEN__

#define LWIP_ALTCP 0

#endif

/** LWIP_ALTCP_TLS==1: enable TLS support for altcp API.

* This needs a port of the functions in altcp_tls.h to a TLS library.

* A port to ARM mbedtls is provided with lwIP, see apps/altcp_tls/ directory

* and LWIP_ALTCP_TLS_MBEDTLS option.

#if !defined LWIP_ALTCP_TLS || defined __DOXYGEN__

#define LWIP_ALTCP_TLS 0

#endif

/**

* @}

----------------------------------

---------- Pbuf options ----------

----------------------------------

/**

* @defgroup lwip_opts_pbuf PBUF

* @ingroup lwip_opts

* @{

/**

* 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.

#if !defined PBUF_LINK_HLEN || defined __DOXYGEN__

#if defined LWIP_HOOK_VLAN_SET && !defined __DOXYGEN__

#define PBUF_LINK_HLEN (18 + ETH_PAD_SIZE)

#else /* LWIP_HOOK_VLAN_SET */

#define PBUF_LINK_HLEN (14 + ETH_PAD_SIZE)

#endif /* LWIP_HOOK_VLAN_SET */

#endif

/**

* PBUF_LINK_ENCAPSULATION_HLEN: the number of bytes that should be allocated

* for an additional encapsulation header before ethernet headers (e.g. 802.11)

#if !defined PBUF_LINK_ENCAPSULATION_HLEN || defined __DOXYGEN__

#define PBUF_LINK_ENCAPSULATION_HLEN 0

#endif

/**

* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. The default is

* designed to accommodate single full size TCP frame in one pbuf, including

* TCP_MSS, IP header, and link header.

#if !defined PBUF_POOL_BUFSIZE || defined __DOXYGEN__

#define PBUF_POOL_BUFSIZE LWIP_MEM_ALIGN_SIZE(TCP_MSS+40+PBUF_LINK_ENCAPSULATION_HLEN+PBUF_LINK_HLEN)

#endif

/**

* LWIP_PBUF_REF_T: Refcount type in pbuf.

* Default width of u8_t can be increased if 255 refs are not enough for you.

#if !defined LWIP_PBUF_REF_T || defined __DOXYGEN__

#define LWIP_PBUF_REF_T u8_t

#endif

/**

* @}

------------------------------------------------

---------- Network Interfaces options ----------

------------------------------------------------

/**

* @defgroup lwip_opts_netif NETIF

* @ingroup lwip_opts

* @{

/**

* LWIP_SINGLE_NETIF==1: use a single netif only. This is the common case for

* small real-life targets. Some code like routing etc. can be left out.

#if !defined LWIP_SINGLE_NETIF || defined __DOXYGEN__

#define LWIP_SINGLE_NETIF 0

#endif

/**

* LWIP_NETIF_HOSTNAME==1: use DHCP_OPTION_HOSTNAME with netif's hostname

* field.

#if !defined LWIP_NETIF_HOSTNAME || defined __DOXYGEN__

#define LWIP_NETIF_HOSTNAME 0

#endif

/**

* LWIP_NETIF_API==1: Support netif api (in netifapi.c)

#if !defined LWIP_NETIF_API || defined __DOXYGEN__

#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 acquisition)

#if !defined LWIP_NETIF_STATUS_CALLBACK || defined __DOXYGEN__

#define LWIP_NETIF_STATUS_CALLBACK 0

#endif

/**

* LWIP_NETIF_EXT_STATUS_CALLBACK==1: Support an extended callback function

* for several netif related event that supports multiple subscribers.

* @see netif_ext_status_callback

#if !defined LWIP_NETIF_EXT_STATUS_CALLBACK || defined __DOXYGEN__

#define LWIP_NETIF_EXT_STATUS_CALLBACK 0

#endif

/**

* LWIP_NETIF_LINK_CALLBACK==1: Support a callback function from an interface

* whenever the link changes (i.e., link down)

#if !defined LWIP_NETIF_LINK_CALLBACK || defined __DOXYGEN__

#define LWIP_NETIF_LINK_CALLBACK 0

#endif

/**

* LWIP_NETIF_REMOVE_CALLBACK==1: Support a callback function that is called

* when a netif has been removed

#if !defined LWIP_NETIF_REMOVE_CALLBACK || defined __DOXYGEN__

#define LWIP_NETIF_REMOVE_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.

#if !defined LWIP_NETIF_HWADDRHINT || defined __DOXYGEN__

#define LWIP_NETIF_HWADDRHINT 0

#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!

* ATTENTION: a driver should *NOT* rely on getting single pbufs but check TX

* pbufs for being in one piece. If not, @ref pbuf_clone can be used to get

* a single pbuf:

* if (p->next != NULL) {

* struct pbuf *q = pbuf_clone(PBUF_RAW, PBUF_RAM, p);

* if (q == NULL) {

* return ERR_MEM;

* }

* p = q; ATTENTION: do NOT free the old 'p' as the ref belongs to the caller!

* }

#if !defined LWIP_NETIF_TX_SINGLE_PBUF || defined __DOXYGEN__

#define LWIP_NETIF_TX_SINGLE_PBUF 0

#endif /* LWIP_NETIF_TX_SINGLE_PBUF */

/**

* LWIP_NUM_NETIF_CLIENT_DATA: Number of clients that may store

* data in client_data member array of struct netif (max. 256).

#if !defined LWIP_NUM_NETIF_CLIENT_DATA || defined __DOXYGEN__

#define LWIP_NUM_NETIF_CLIENT_DATA 0

#endif

/**

* @}

------------------------------------

---------- LOOPIF options ----------

------------------------------------

/**

* @defgroup lwip_opts_loop Loopback interface

* @ingroup lwip_opts_netif

* @{

/**

* LWIP_HAVE_LOOPIF==1: Support loop interface (127.0.0.1).

* This is only needed when no real netifs are available. If at least one other

* netif is available, loopback traffic uses this netif.

#if !defined LWIP_HAVE_LOOPIF || defined __DOXYGEN__

#define LWIP_HAVE_LOOPIF (LWIP_NETIF_LOOPBACK && !LWIP_SINGLE_NETIF)

#endif

/**

* LWIP_LOOPIF_MULTICAST==1: Support multicast/IGMP on loop interface (127.0.0.1).

#if !defined LWIP_LOOPIF_MULTICAST || defined __DOXYGEN__

#define LWIP_LOOPIF_MULTICAST 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.

#if !defined LWIP_NETIF_LOOPBACK || defined __DOXYGEN__

#define LWIP_NETIF_LOOPBACK 0

#endif

/**

* LWIP_LOOPBACK_MAX_PBUFS: Maximum number of pbufs on queue for loopback

* sending for each netif (0 = disabled)

#if !defined LWIP_LOOPBACK_MAX_PBUFS || defined __DOXYGEN__

#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.

#if !defined LWIP_NETIF_LOOPBACK_MULTITHREADING || defined __DOXYGEN__

#define LWIP_NETIF_LOOPBACK_MULTITHREADING (!NO_SYS)

#endif

/**

* @}

------------------------------------

---------- Thread options ----------

------------------------------------

/**

* @defgroup lwip_opts_thread Threading

* @ingroup lwip_opts_infrastructure

* @{

/**

* TCPIP_THREAD_NAME: The name assigned to the main tcpip thread.

#if !defined TCPIP_THREAD_NAME || defined __DOXYGEN__

#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.

#if !defined TCPIP_THREAD_STACKSIZE || defined __DOXYGEN__

#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.

#if !defined TCPIP_THREAD_PRIO || defined __DOXYGEN__

#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.

#if !defined TCPIP_MBOX_SIZE || defined __DOXYGEN__

#define TCPIP_MBOX_SIZE 50

#endif

/**

* Define this to something that triggers a watchdog. This is called from

* tcpip_thread after processing a message.

#if !defined LWIP_TCPIP_THREAD_ALIVE || defined __DOXYGEN__

#define LWIP_TCPIP_THREAD_ALIVE()

#endif

/**

* SLIPIF_THREAD_NAME: The name assigned to the slipif_loop thread.

#if !defined SLIPIF_THREAD_NAME || defined __DOXYGEN__

#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.

#if !defined SLIPIF_THREAD_STACKSIZE || defined __DOXYGEN__

#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.

#if !defined SLIPIF_THREAD_PRIO || defined __DOXYGEN__

#define SLIPIF_THREAD_PRIO 1

#endif

/**

* DEFAULT_THREAD_NAME: The name assigned to any other lwIP thread.

#if !defined DEFAULT_THREAD_NAME || defined __DOXYGEN__

#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.

#if !defined DEFAULT_THREAD_STACKSIZE || defined __DOXYGEN__

#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.

#if !defined DEFAULT_THREAD_PRIO || defined __DOXYGEN__

#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.

#if !defined DEFAULT_RAW_RECVMBOX_SIZE || defined __DOXYGEN__

#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.

#if !defined DEFAULT_UDP_RECVMBOX_SIZE || defined __DOXYGEN__

#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.

#if !defined DEFAULT_TCP_RECVMBOX_SIZE || defined __DOXYGEN__

#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.

#if !defined DEFAULT_ACCEPTMBOX_SIZE || defined __DOXYGEN__

#define DEFAULT_ACCEPTMBOX_SIZE 50

#endif

/**

* @}

----------------------------------------------

---------- Sequential layer options ----------

----------------------------------------------

/**

* @defgroup lwip_opts_netconn Netconn

* @ingroup lwip_opts_threadsafe_apis

* @{

/**

* LWIP_NETCONN==1: Enable Netconn API (require to use api_lib.c)

#if !defined LWIP_NETCONN || defined __DOXYGEN__

#define LWIP_NETCONN 1

#endif

/** LWIP_TCPIP_TIMEOUT==1: Enable tcpip_timeout/tcpip_untimeout to create

* timers running in tcpip_thread from another thread.

#if !defined LWIP_TCPIP_TIMEOUT || defined __DOXYGEN__

#define LWIP_TCPIP_TIMEOUT 0

#endif

/** LWIP_NETCONN_SEM_PER_THREAD==1: Use one (thread-local) semaphore per

* thread calling socket/netconn functions instead of allocating one

* semaphore per netconn (and per select etc.)

* ATTENTION: a thread-local semaphore for API calls is needed:

* - LWIP_NETCONN_THREAD_SEM_GET() returning a sys_sem_t*

* - LWIP_NETCONN_THREAD_SEM_ALLOC() creating the semaphore

* - LWIP_NETCONN_THREAD_SEM_FREE() freeing the semaphore

* The latter 2 can be invoked up by calling netconn_thread_init()/netconn_thread_cleanup().

* Ports may call these for threads created with sys_thread_new().

#if !defined LWIP_NETCONN_SEM_PER_THREAD || defined __DOXYGEN__

#define LWIP_NETCONN_SEM_PER_THREAD 0

#endif

/** LWIP_NETCONN_FULLDUPLEX==1: Enable code that allows reading from one thread,

* writing from a 2nd thread and closing from a 3rd thread at the same time.

* ATTENTION: This is currently really alpha! Some requirements:

* - LWIP_NETCONN_SEM_PER_THREAD==1 is required to use one socket/netconn from

* multiple threads at once

* - sys_mbox_free() has to unblock receive tasks waiting on recvmbox/acceptmbox

* and prevent a task pending on this during/after deletion

#if !defined LWIP_NETCONN_FULLDUPLEX || defined __DOXYGEN__

#define LWIP_NETCONN_FULLDUPLEX 0

#endif

/**

* @}

------------------------------------

---------- Socket options ----------

------------------------------------

/**

* @defgroup lwip_opts_socket Sockets

* @ingroup lwip_opts_threadsafe_apis

* @{

/**

* LWIP_SOCKET==1: Enable Socket API (require to use sockets.c)

#if !defined LWIP_SOCKET || defined __DOXYGEN__

#define LWIP_SOCKET 1

#endif

/**

* LWIP_COMPAT_SOCKETS==1: Enable BSD-style sockets functions names through defines.

* LWIP_COMPAT_SOCKETS==2: Same as ==1 but correctly named functions are created.

* While this helps code completion, it might conflict with existing libraries.

* (only used if you use sockets.c)

#if !defined LWIP_COMPAT_SOCKETS || defined __DOXYGEN__

#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)

#if !defined LWIP_POSIX_SOCKETS_IO_NAMES || defined __DOXYGEN__

#define LWIP_POSIX_SOCKETS_IO_NAMES 1

#endif

/**

* LWIP_SOCKET_OFFSET==n: Increases the file descriptor number created by LwIP with n.

* This can be useful when there are multiple APIs which create file descriptors.

* When they all start with a different offset and you won't make them overlap you can

* re implement read/write/close/ioctl/fnctl to send the requested action to the right

* library (sharing select will need more work though).

#if !defined LWIP_SOCKET_OFFSET || defined __DOXYGEN__

#define LWIP_SOCKET_OFFSET 0

#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)

#if !defined LWIP_TCP_KEEPALIVE || defined __DOXYGEN__

#define LWIP_TCP_KEEPALIVE 0

#endif

/**

* LWIP_SO_SNDTIMEO==1: Enable send timeout for sockets/netconns and

* SO_SNDTIMEO processing.

#if !defined LWIP_SO_SNDTIMEO || defined __DOXYGEN__

#define LWIP_SO_SNDTIMEO 0

#endif

/**

* LWIP_SO_RCVTIMEO==1: Enable receive timeout for sockets/netconns and

* SO_RCVTIMEO processing.

#if !defined LWIP_SO_RCVTIMEO || defined __DOXYGEN__

#define LWIP_SO_RCVTIMEO 0

#endif

/**

* LWIP_SO_SNDRCVTIMEO_NONSTANDARD==1: SO_RCVTIMEO/SO_SNDTIMEO take an int

* (milliseconds, much like winsock does) instead of a struct timeval (default).

#if !defined LWIP_SO_SNDRCVTIMEO_NONSTANDARD || defined __DOXYGEN__

#define LWIP_SO_SNDRCVTIMEO_NONSTANDARD 0

#endif

/**

* LWIP_SO_RCVBUF==1: Enable SO_RCVBUF processing.

#if !defined LWIP_SO_RCVBUF || defined __DOXYGEN__

#define LWIP_SO_RCVBUF 0

#endif

/**

* LWIP_SO_LINGER==1: Enable SO_LINGER processing.

#if !defined LWIP_SO_LINGER || defined __DOXYGEN__

#define LWIP_SO_LINGER 0

#endif

/**

* If LWIP_SO_RCVBUF is used, this is the default value for recv_bufsize.

#if !defined RECV_BUFSIZE_DEFAULT || defined __DOXYGEN__

#define RECV_BUFSIZE_DEFAULT INT_MAX

#endif

/**

* By default, TCP socket/netconn close waits 20 seconds max to send the FIN

#if !defined LWIP_TCP_CLOSE_TIMEOUT_MS_DEFAULT || defined __DOXYGEN__

#define LWIP_TCP_CLOSE_TIMEOUT_MS_DEFAULT 20000

#endif

/**

* SO_REUSE==1: Enable SO_REUSEADDR option.

#if !defined SO_REUSE || defined __DOXYGEN__

#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!

#if !defined SO_REUSE_RXTOALL || defined __DOXYGEN__

#define SO_REUSE_RXTOALL 0

#endif

/**

* LWIP_FIONREAD_LINUXMODE==0 (default): ioctl/FIONREAD returns the amount of

* pending data in the network buffer. This is the way windows does it. It's

* the default for lwIP since it is smaller.

* LWIP_FIONREAD_LINUXMODE==1: ioctl/FIONREAD returns the size of the next

* pending datagram in bytes. This is the way linux does it. This code is only

* here for compatibility.

#if !defined LWIP_FIONREAD_LINUXMODE || defined __DOXYGEN__

#define LWIP_FIONREAD_LINUXMODE 0

#endif

/**

* LWIP_SOCKET_SELECT==1 (default): enable select() for sockets (uses a netconn

* callback to keep track of events).

* This saves RAM (counters per socket) and code (netconn event callback), which

* should improve performance a bit).

#if !defined LWIP_SOCKET_SELECT || defined __DOXYGEN__

#define LWIP_SOCKET_SELECT 1

#endif

/**

* LWIP_SOCKET_POLL==1 (default): enable poll() for sockets (including

* struct pollfd, nfds_t, and constants)

#if !defined LWIP_SOCKET_POLL || defined __DOXYGEN__

#define LWIP_SOCKET_POLL 1

#endif

/**

* @}

----------------------------------------

---------- Statistics options ----------

----------------------------------------

/**

* @defgroup lwip_opts_stats Statistics

* @ingroup lwip_opts_debug

* @{

/**

* LWIP_STATS==1: Enable statistics collection in lwip_stats.

#if !defined LWIP_STATS || defined __DOXYGEN__

#define LWIP_STATS 1

#endif

#if LWIP_STATS

/**

* LWIP_STATS_DISPLAY==1: Compile in the statistics output functions.

#if !defined LWIP_STATS_DISPLAY || defined __DOXYGEN__

#define LWIP_STATS_DISPLAY 0

#endif

/**

* LINK_STATS==1: Enable link stats.

#if !defined LINK_STATS || defined __DOXYGEN__

#define LINK_STATS 1

#endif

/**

* ETHARP_STATS==1: Enable etharp stats.

#if !defined ETHARP_STATS || defined __DOXYGEN__

#define ETHARP_STATS (LWIP_ARP)

#endif

/**

* IP_STATS==1: Enable IP stats.

#if !defined IP_STATS || defined __DOXYGEN__

#define IP_STATS 1

#endif

/**

* IPFRAG_STATS==1: Enable IP fragmentation stats. Default is

* on if using either frag or reass.

#if !defined IPFRAG_STATS || defined __DOXYGEN__

#define IPFRAG_STATS (IP_REASSEMBLY || IP_FRAG)

#endif

/**

* ICMP_STATS==1: Enable ICMP stats.

#if !defined ICMP_STATS || defined __DOXYGEN__

#define ICMP_STATS 1

#endif

/**

* IGMP_STATS==1: Enable IGMP stats.

#if !defined IGMP_STATS || defined __DOXYGEN__

#define IGMP_STATS (LWIP_IGMP)

#endif

/**

* UDP_STATS==1: Enable UDP stats. Default is on if

* UDP enabled, otherwise off.

#if !defined UDP_STATS || defined __DOXYGEN__

#define UDP_STATS (LWIP_UDP)

#endif

/**

* TCP_STATS==1: Enable TCP stats. Default is on if TCP

* enabled, otherwise off.

#if !defined TCP_STATS || defined __DOXYGEN__

#define TCP_STATS (LWIP_TCP)

#endif

/**

* MEM_STATS==1: Enable mem.c stats.

#if !defined MEM_STATS || defined __DOXYGEN__

#define MEM_STATS ((MEM_LIBC_MALLOC == 0) && (MEM_USE_POOLS == 0))

#endif

/**

* MEMP_STATS==1: Enable memp.c pool stats.

#if !defined MEMP_STATS || defined __DOXYGEN__

#define MEMP_STATS (MEMP_MEM_MALLOC == 0)

#endif

/**

* SYS_STATS==1: Enable system stats (sem and mbox counts, etc).

#if !defined SYS_STATS || defined __DOXYGEN__

#define SYS_STATS (NO_SYS == 0)

#endif

/**

* IP6_STATS==1: Enable IPv6 stats.

#if !defined IP6_STATS || defined __DOXYGEN__

#define IP6_STATS (LWIP_IPV6)

#endif

/**

* ICMP6_STATS==1: Enable ICMP for IPv6 stats.

#if !defined ICMP6_STATS || defined __DOXYGEN__

#define ICMP6_STATS (LWIP_IPV6 && LWIP_ICMP6)

#endif

/**

* IP6_FRAG_STATS==1: Enable IPv6 fragmentation stats.

#if !defined IP6_FRAG_STATS || defined __DOXYGEN__

#define IP6_FRAG_STATS (LWIP_IPV6 && (LWIP_IPV6_FRAG || LWIP_IPV6_REASS))

#endif

/**

* MLD6_STATS==1: Enable MLD for IPv6 stats.

#if !defined MLD6_STATS || defined __DOXYGEN__

#define MLD6_STATS (LWIP_IPV6 && LWIP_IPV6_MLD)

#endif

/**

* ND6_STATS==1: Enable Neighbor discovery for IPv6 stats.

#if !defined ND6_STATS || defined __DOXYGEN__

#define ND6_STATS (LWIP_IPV6)

#endif

/**

* MIB2_STATS==1: Stats for SNMP MIB2.

#if !defined MIB2_STATS || defined __DOXYGEN__

#define MIB2_STATS 0

#endif

#else

#define LINK_STATS 0

#define ETHARP_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

#define IP6_STATS 0

#define ICMP6_STATS 0

#define IP6_FRAG_STATS 0

#define MLD6_STATS 0

#define ND6_STATS 0

#define MIB2_STATS 0

#endif /* LWIP_STATS */

/**

* @}

--------------------------------------

---------- Checksum options ----------

--------------------------------------

/**

* @defgroup lwip_opts_checksum Checksum

* @ingroup lwip_opts_infrastructure

* @{

/**

* LWIP_CHECKSUM_CTRL_PER_NETIF==1: Checksum generation/check can be enabled/disabled

* per netif.

* ATTENTION: if enabled, the CHECKSUM_GEN_* and CHECKSUM_CHECK_* defines must be enabled!

#if !defined LWIP_CHECKSUM_CTRL_PER_NETIF || defined __DOXYGEN__

#define LWIP_CHECKSUM_CTRL_PER_NETIF 0

#endif

/**

* CHECKSUM_GEN_IP==1: Generate checksums in software for outgoing IP packets.

#if !defined CHECKSUM_GEN_IP || defined __DOXYGEN__

#define CHECKSUM_GEN_IP 1

#endif

/**

* CHECKSUM_GEN_UDP==1: Generate checksums in software for outgoing UDP packets.

#if !defined CHECKSUM_GEN_UDP || defined __DOXYGEN__

#define CHECKSUM_GEN_UDP 1

#endif

/**

* CHECKSUM_GEN_TCP==1: Generate checksums in software for outgoing TCP packets.

#if !defined CHECKSUM_GEN_TCP || defined __DOXYGEN__

#define CHECKSUM_GEN_TCP 1

#endif

/**

* CHECKSUM_GEN_ICMP==1: Generate checksums in software for outgoing ICMP packets.

#if !defined CHECKSUM_GEN_ICMP || defined __DOXYGEN__

#define CHECKSUM_GEN_ICMP 1

#endif

/**

* CHECKSUM_GEN_ICMP6==1: Generate checksums in software for outgoing ICMP6 packets.

#if !defined CHECKSUM_GEN_ICMP6 || defined __DOXYGEN__

#define CHECKSUM_GEN_ICMP6 1

#endif

/**

* CHECKSUM_CHECK_IP==1: Check checksums in software for incoming IP packets.

#if !defined CHECKSUM_CHECK_IP || defined __DOXYGEN__

#define CHECKSUM_CHECK_IP 1

#endif

/**

* CHECKSUM_CHECK_UDP==1: Check checksums in software for incoming UDP packets.

#if !defined CHECKSUM_CHECK_UDP || defined __DOXYGEN__

#define CHECKSUM_CHECK_UDP 1

#endif

/**

* CHECKSUM_CHECK_TCP==1: Check checksums in software for incoming TCP packets.

#if !defined CHECKSUM_CHECK_TCP || defined __DOXYGEN__

#define CHECKSUM_CHECK_TCP 1

#endif

/**

* CHECKSUM_CHECK_ICMP==1: Check checksums in software for incoming ICMP packets.

#if !defined CHECKSUM_CHECK_ICMP || defined __DOXYGEN__

#define CHECKSUM_CHECK_ICMP 1

#endif

/**

* CHECKSUM_CHECK_ICMP6==1: Check checksums in software for incoming ICMPv6 packets

#if !defined CHECKSUM_CHECK_ICMP6 || defined __DOXYGEN__

#define CHECKSUM_CHECK_ICMP6 1

#endif

/**

* LWIP_CHECKSUM_ON_COPY==1: Calculate checksum when copying data from

* application buffers to pbufs.

#if !defined LWIP_CHECKSUM_ON_COPY || defined __DOXYGEN__

#define LWIP_CHECKSUM_ON_COPY 0

#endif

/**

* @}

---------------------------------------

---------- IPv6 options ---------------

---------------------------------------

/**

* @defgroup lwip_opts_ipv6 IPv6

* @ingroup lwip_opts

* @{

/**

* LWIP_IPV6==1: Enable IPv6

#if !defined LWIP_IPV6 || defined __DOXYGEN__

#define LWIP_IPV6 0

#endif

/**

* IPV6_REASS_MAXAGE: Maximum time (in multiples of IP6_REASS_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.

#if !defined IPV6_REASS_MAXAGE || defined __DOXYGEN__

#define IPV6_REASS_MAXAGE 60

#endif

/**

* LWIP_IPV6_SCOPES==1: Enable support for IPv6 address scopes, ensuring that

* e.g. link-local addresses are really treated as link-local. Disable this

* setting only for single-interface configurations.

* All addresses that have a scope according to the default policy (link-local

* unicast addresses, interface-local and link-local multicast addresses) should

* now have a zone set on them before being passed to the core API, although

* lwIP will currently attempt to select a zone on the caller's behalf when

* necessary. Applications that directly assign IPv6 addresses to interfaces

* (which is NOT recommended) must now ensure that link-local addresses carry

* the netif's zone. See the new ip6_zone.h header file for more information and

* relevant macros. For now it is still possible to turn off scopes support

* through the new LWIP_IPV6_SCOPES option. When upgrading an implementation that

* uses the core API directly, it is highly recommended to enable

* LWIP_IPV6_SCOPES_DEBUG at least for a while, to ensure e.g. proper address

* initialization.

#if !defined LWIP_IPV6_SCOPES || defined __DOXYGEN__

#define LWIP_IPV6_SCOPES (LWIP_IPV6 && !LWIP_SINGLE_NETIF)

#endif

/**

* LWIP_IPV6_SCOPES_DEBUG==1: Perform run-time checks to verify that addresses

* are properly zoned (see ip6_zone.h on what that means) where it matters.

* Enabling this setting is highly recommended when upgrading from an existing

* installation that is not yet scope-aware; otherwise it may be too expensive.

#if !defined LWIP_IPV6_SCOPES_DEBUG || defined __DOXYGEN__

#define LWIP_IPV6_SCOPES_DEBUG 0

#endif

/**

* LWIP_IPV6_NUM_ADDRESSES: Number of IPv6 addresses per netif.

#if !defined LWIP_IPV6_NUM_ADDRESSES || defined __DOXYGEN__

#define LWIP_IPV6_NUM_ADDRESSES 3

#endif

/**

* LWIP_IPV6_FORWARD==1: Forward IPv6 packets across netifs

#if !defined LWIP_IPV6_FORWARD || defined __DOXYGEN__

#define LWIP_IPV6_FORWARD 0

#endif

/**

* LWIP_IPV6_FRAG==1: Fragment outgoing IPv6 packets that are too big.

#if !defined LWIP_IPV6_FRAG || defined __DOXYGEN__

#define LWIP_IPV6_FRAG 1

#endif

/**

* LWIP_IPV6_REASS==1: reassemble incoming IPv6 packets that fragmented

#if !defined LWIP_IPV6_REASS || defined __DOXYGEN__

#define LWIP_IPV6_REASS LWIP_IPV6

#endif

/**

* LWIP_IPV6_SEND_ROUTER_SOLICIT==1: Send router solicitation messages during

* network startup.

#if !defined LWIP_IPV6_SEND_ROUTER_SOLICIT || defined __DOXYGEN__

#define LWIP_IPV6_SEND_ROUTER_SOLICIT 1

#endif

/**

* LWIP_IPV6_AUTOCONFIG==1: Enable stateless address autoconfiguration as per RFC 4862.

#if !defined LWIP_IPV6_AUTOCONFIG || defined __DOXYGEN__

#define LWIP_IPV6_AUTOCONFIG LWIP_IPV6

#endif

/**

* LWIP_IPV6_ADDRESS_LIFETIMES==1: Keep valid and preferred lifetimes for each

* IPv6 address. Required for LWIP_IPV6_AUTOCONFIG. May still be enabled

* otherwise, in which case the application may assign address lifetimes with

* the appropriate macros. Addresses with no lifetime are assumed to be static.

* If this option is disabled, all addresses are assumed to be static.

#if !defined LWIP_IPV6_ADDRESS_LIFETIMES || defined __DOXYGEN__

#define LWIP_IPV6_ADDRESS_LIFETIMES LWIP_IPV6_AUTOCONFIG

#endif

/**

* LWIP_IPV6_DUP_DETECT_ATTEMPTS=[0..7]: Number of duplicate address detection attempts.

#if !defined LWIP_IPV6_DUP_DETECT_ATTEMPTS || defined __DOXYGEN__

#define LWIP_IPV6_DUP_DETECT_ATTEMPTS 1

#endif

/**

* @}

/**

* @defgroup lwip_opts_icmp6 ICMP6

* @ingroup lwip_opts_ipv6

* @{

/**

* LWIP_ICMP6==1: Enable ICMPv6 (mandatory per RFC)

#if !defined LWIP_ICMP6 || defined __DOXYGEN__

#define LWIP_ICMP6 LWIP_IPV6

#endif

/**

* LWIP_ICMP6_DATASIZE: bytes from original packet to send back in

* ICMPv6 error messages.

#if !defined LWIP_ICMP6_DATASIZE || defined __DOXYGEN__

#define LWIP_ICMP6_DATASIZE 8

#endif

/**

* LWIP_ICMP6_HL: default hop limit for ICMPv6 messages

#if !defined LWIP_ICMP6_HL || defined __DOXYGEN__

#define LWIP_ICMP6_HL 255

#endif

/**

* @}

/**

* @defgroup lwip_opts_mld6 Multicast listener discovery

* @ingroup lwip_opts_ipv6

* @{

/**

* LWIP_IPV6_MLD==1: Enable multicast listener discovery protocol.

* If LWIP_IPV6 is enabled but this setting is disabled, the MAC layer must

* indiscriminately pass all inbound IPv6 multicast traffic to lwIP.

#if !defined LWIP_IPV6_MLD || defined __DOXYGEN__

#define LWIP_IPV6_MLD LWIP_IPV6

#endif

/**

* MEMP_NUM_MLD6_GROUP: Max number of IPv6 multicast groups that can be joined.

* There must be enough groups so that each netif can join the solicited-node

* multicast group for each of its local addresses, plus one for MDNS if

* applicable, plus any number of groups to be joined on UDP sockets.

#if !defined MEMP_NUM_MLD6_GROUP || defined __DOXYGEN__

#define MEMP_NUM_MLD6_GROUP 4

#endif

/**

* @}

/**

* @defgroup lwip_opts_nd6 Neighbor discovery

* @ingroup lwip_opts_ipv6

* @{

/**

* LWIP_ND6_QUEUEING==1: queue outgoing IPv6 packets while MAC address

* is being resolved.

#if !defined LWIP_ND6_QUEUEING || defined __DOXYGEN__

#define LWIP_ND6_QUEUEING LWIP_IPV6

#endif

/**

* MEMP_NUM_ND6_QUEUE: Max number of IPv6 packets to queue during MAC resolution.

#if !defined MEMP_NUM_ND6_QUEUE || defined __DOXYGEN__

#define MEMP_NUM_ND6_QUEUE 20

#endif

/**

* LWIP_ND6_NUM_NEIGHBORS: Number of entries in IPv6 neighbor cache

#if !defined LWIP_ND6_NUM_NEIGHBORS || defined __DOXYGEN__

#define LWIP_ND6_NUM_NEIGHBORS 10

#endif

/**

* LWIP_ND6_NUM_DESTINATIONS: number of entries in IPv6 destination cache

#if !defined LWIP_ND6_NUM_DESTINATIONS || defined __DOXYGEN__

#define LWIP_ND6_NUM_DESTINATIONS 10

#endif

/**

* LWIP_ND6_NUM_PREFIXES: number of entries in IPv6 on-link prefixes cache

#if !defined LWIP_ND6_NUM_PREFIXES || defined __DOXYGEN__

#define LWIP_ND6_NUM_PREFIXES 5

#endif

/**

* LWIP_ND6_NUM_ROUTERS: number of entries in IPv6 default router cache

#if !defined LWIP_ND6_NUM_ROUTERS || defined __DOXYGEN__

#define LWIP_ND6_NUM_ROUTERS 3

#endif

/**

* LWIP_ND6_MAX_MULTICAST_SOLICIT: max number of multicast solicit messages to send

* (neighbor solicit and router solicit)

#if !defined LWIP_ND6_MAX_MULTICAST_SOLICIT || defined __DOXYGEN__

#define LWIP_ND6_MAX_MULTICAST_SOLICIT 3

#endif

/**

* LWIP_ND6_MAX_UNICAST_SOLICIT: max number of unicast neighbor solicitation messages

* to send during neighbor reachability detection.

#if !defined LWIP_ND6_MAX_UNICAST_SOLICIT || defined __DOXYGEN__

#define LWIP_ND6_MAX_UNICAST_SOLICIT 3

#endif

/**

* Unused: See ND RFC (time in milliseconds).

#if !defined LWIP_ND6_MAX_ANYCAST_DELAY_TIME || defined __DOXYGEN__

#define LWIP_ND6_MAX_ANYCAST_DELAY_TIME 1000

#endif

/**

* Unused: See ND RFC

#if !defined LWIP_ND6_MAX_NEIGHBOR_ADVERTISEMENT || defined __DOXYGEN__

#define LWIP_ND6_MAX_NEIGHBOR_ADVERTISEMENT 3

#endif

/**

* LWIP_ND6_REACHABLE_TIME: default neighbor reachable time (in milliseconds).

* May be updated by router advertisement messages.

#if !defined LWIP_ND6_REACHABLE_TIME || defined __DOXYGEN__

#define LWIP_ND6_REACHABLE_TIME 30000

#endif

/**

* LWIP_ND6_RETRANS_TIMER: default retransmission timer for solicitation messages

#if !defined LWIP_ND6_RETRANS_TIMER || defined __DOXYGEN__

#define LWIP_ND6_RETRANS_TIMER 1000

#endif

/**

* LWIP_ND6_DELAY_FIRST_PROBE_TIME: Delay before first unicast neighbor solicitation

* message is sent, during neighbor reachability detection.

#if !defined LWIP_ND6_DELAY_FIRST_PROBE_TIME || defined __DOXYGEN__

#define LWIP_ND6_DELAY_FIRST_PROBE_TIME 5000

#endif

/**

* LWIP_ND6_ALLOW_RA_UPDATES==1: Allow Router Advertisement messages to update

* Reachable time and retransmission timers, and netif MTU.

#if !defined LWIP_ND6_ALLOW_RA_UPDATES || defined __DOXYGEN__

#define LWIP_ND6_ALLOW_RA_UPDATES 1

#endif

/**

* LWIP_ND6_TCP_REACHABILITY_HINTS==1: Allow TCP to provide Neighbor Discovery

* with reachability hints for connected destinations. This helps avoid sending

* unicast neighbor solicitation messages.

#if !defined LWIP_ND6_TCP_REACHABILITY_HINTS || defined __DOXYGEN__

#define LWIP_ND6_TCP_REACHABILITY_HINTS 1

#endif

/**

* LWIP_ND6_RDNSS_MAX_DNS_SERVERS > 0: Use IPv6 Router Advertisement Recursive

* DNS Server Option (as per RFC 6106) to copy a defined maximum number of DNS

* servers to the DNS module.

#if !defined LWIP_ND6_RDNSS_MAX_DNS_SERVERS || defined __DOXYGEN__

#define LWIP_ND6_RDNSS_MAX_DNS_SERVERS 0

#endif

/**

* @}

/**

* @defgroup lwip_opts_dhcpv6 DHCPv6

* @ingroup lwip_opts_ipv6

* @{

/**

* LWIP_IPV6_DHCP6==1: enable DHCPv6 stateful/stateless address autoconfiguration.

#if !defined LWIP_IPV6_DHCP6 || defined __DOXYGEN__

#define LWIP_IPV6_DHCP6 0

#endif

/**

* LWIP_IPV6_DHCP6_STATEFUL==1: enable DHCPv6 stateful address autoconfiguration.

* (not supported, yet!)

#if !defined LWIP_IPV6_DHCP6_STATEFUL || defined __DOXYGEN__

#define LWIP_IPV6_DHCP6_STATEFUL 0

#endif

/**

* LWIP_IPV6_DHCP6_STATELESS==1: enable DHCPv6 stateless address autoconfiguration.

#if !defined LWIP_IPV6_DHCP6_STATELESS || defined __DOXYGEN__

#define LWIP_IPV6_DHCP6_STATELESS LWIP_IPV6_DHCP6

#endif

/**

* LWIP_DHCP6_GETS_NTP==1: Request NTP servers via DHCPv6. For each

* response packet, a callback is called, which has to be provided by the port:

* void dhcp6_set_ntp_servers(u8_t num_ntp_servers, ip_addr_t* ntp_server_addrs);

#if !defined LWIP_DHCP6_GET_NTP_SRV || defined __DOXYGEN__

#define LWIP_DHCP6_GET_NTP_SRV 0

#endif

/**

* The maximum of NTP servers requested

#if !defined LWIP_DHCP6_MAX_NTP_SERVERS || defined __DOXYGEN__

#define LWIP_DHCP6_MAX_NTP_SERVERS 1

#endif

/**

* LWIP_DHCP6_MAX_DNS_SERVERS > 0: Request DNS servers via DHCPv6.

* DNS servers received in the response are passed to DNS via @ref dns_setserver()

* (up to the maximum limit defined here).

#if !defined LWIP_DHCP6_MAX_DNS_SERVERS || defined __DOXYGEN__

#define LWIP_DHCP6_MAX_DNS_SERVERS DNS_MAX_SERVERS

#endif

/**

* @}

---------------------------------------

---------- Hook options ---------------

---------------------------------------

/**

* @defgroup lwip_opts_hooks Hooks

* @ingroup lwip_opts_infrastructure

* Hooks are undefined by default, define them to a function if you need them.

* @{

/**

* LWIP_HOOK_FILENAME: Custom filename to \#include in files that provide hooks.

* Declare your hook function prototypes in there, you may also \#include all headers

* providing data types that are need in this file.

#ifdef __DOXYGEN__

#define LWIP_HOOK_FILENAME "path/to/my/lwip_hooks.h"

#endif

/**

* LWIP_HOOK_TCP_ISN:

* Hook for generation of the Initial Sequence Number (ISN) for a new TCP

* connection. The default lwIP ISN generation algorithm is very basic and may

* allow for TCP spoofing attacks. This hook provides the means to implement

* the standardized ISN generation algorithm from RFC 6528 (see contrib/adons/tcp_isn),

* or any other desired algorithm as a replacement.

* Called from tcp_connect() and tcp_listen_input() when an ISN is needed for

* a new TCP connection, if TCP support (@ref LWIP_TCP) is enabled.\n

* Signature:\code{.c}

* u32_t my_hook_tcp_isn(const ip_addr_t* local_ip, u16_t local_port, const ip_addr_t* remote_ip, u16_t remote_port);

* \endcode

* - it may be necessary to use "struct ip_addr" (ip4_addr, ip6_addr) instead of "ip_addr_t" in function declarations\n

* Arguments:

* - local_ip: pointer to the local IP address of the connection

* - local_port: local port number of the connection (host-byte order)

* - remote_ip: pointer to the remote IP address of the connection

* - remote_port: remote port number of the connection (host-byte order)\n

* Return value:

* - the 32-bit Initial Sequence Number to use for the new TCP connection.

#ifdef __DOXYGEN__

#define LWIP_HOOK_TCP_ISN(local_ip, local_port, remote_ip, remote_port)

#endif

/**

* LWIP_HOOK_TCP_INPACKET_PCB:

* Hook for intercepting incoming packets before they are passed to a pcb. This

* allows updating some state or even dropping a packet.

* Signature:\code{.c}

* err_t my_hook_tcp_inpkt(struct tcp_pcb *pcb, struct tcp_hdr *hdr, u16_t optlen, u16_t opt1len, u8_t *opt2, struct pbuf *p);

* \endcode

* Arguments:

* - pcb: tcp_pcb selected for input of this packet (ATTENTION: this may be

* struct tcp_pcb_listen if pcb->state == LISTEN)

* - hdr: pointer to tcp header (ATTENTION: tcp options may not be in one piece!)

* - optlen: tcp option length

* - opt1len: tcp option length 1st part

* - opt2: if this is != NULL, tcp options are split among 2 pbufs. In that case,

* options start at right after the tcp header ('(u8_t*)(hdr + 1)') for

* the first 'opt1len' bytes and the rest starts at 'opt2'. opt2len can

* be simply calculated: 'opt2len = optlen - opt1len;'

* - p: input packet, p->payload points to application data (that's why tcp hdr

* and options are passed in seperately)

* Return value:

* - ERR_OK: continue input of this packet as normal

* - != ERR_OK: drop this packet for input (don't continue input processing)

* ATTENTION: don't call any tcp api functions that might change tcp state (pcb

* state or any pcb lists) from this callback!

#ifdef __DOXYGEN__

#define LWIP_HOOK_TCP_INPACKET_PCB(pcb, hdr, optlen, opt1len, opt2, p)

#endif

/**

* LWIP_HOOK_TCP_OUT_TCPOPT_LENGTH:

* Hook for increasing the size of the options allocated with a tcp header.

* Together with LWIP_HOOK_TCP_OUT_ADD_TCPOPTS, this can be used to add custom

* options to outgoing tcp segments.

* Signature:\code{.c}

* u8_t my_hook_tcp_out_tcpopt_length(const struct tcp_pcb *pcb, u8_t internal_option_length);

* \endcode

* Arguments:

* - pcb: tcp_pcb that transmits (ATTENTION: this may be NULL or

* struct tcp_pcb_listen if pcb->state == LISTEN)

* - internal_option_length: tcp option length used by the stack internally

* Return value:

* - a number of bytes to allocate for tcp options (internal_option_length <= ret <= 40)

* ATTENTION: don't call any tcp api functions that might change tcp state (pcb

* state or any pcb lists) from this callback!

#ifdef __DOXYGEN__

#define LWIP_HOOK_TCP_OUT_TCPOPT_LENGTH(pcb, internal_len)

#endif

/**

* LWIP_HOOK_TCP_OUT_ADD_TCPOPTS:

* Hook for adding custom options to outgoing tcp segments.

* Space for these custom options has to be reserved via LWIP_HOOK_TCP_OUT_TCPOPT_LENGTH.

* Signature:\code{.c}

* u32_t *my_hook_tcp_out_add_tcpopts(struct pbuf *p, struct tcp_hdr *hdr, const struct tcp_pcb *pcb, u32_t *opts);

* \endcode

* Arguments:

* - p: output packet, p->payload pointing to tcp header, data follows

* - hdr: tcp header

* - pcb: tcp_pcb that transmits (ATTENTION: this may be NULL or

* struct tcp_pcb_listen if pcb->state == LISTEN)

* - opts: pointer where to add the custom options (there may already be options

* between the header and these)

* Return value:

* - pointer pointing directly after the inserted options

* ATTENTION: don't call any tcp api functions that might change tcp state (pcb

* state or any pcb lists) from this callback!

#ifdef __DOXYGEN__

#define LWIP_HOOK_TCP_OUT_ADD_TCPOPTS(p, hdr, pcb, opts)

#endif

/**

* LWIP_HOOK_IP4_INPUT(pbuf, input_netif):

* Called from ip_input() (IPv4)

* Signature:\code{.c}

* int my_hook(struct pbuf *pbuf, struct netif *input_netif);

* \endcode

* Arguments:

* - pbuf: received struct pbuf passed to ip_input()

* - input_netif: struct netif on which the packet has been received

* Return values:

* - 0: Hook has not consumed the packet, packet is processed as normal

* - != 0: Hook has consumed the packet.

* If the hook consumed the packet, 'pbuf' is in the responsibility of the hook

* (i.e. free it when done).

#ifdef __DOXYGEN__

#define LWIP_HOOK_IP4_INPUT(pbuf, input_netif)

#endif

/**

* LWIP_HOOK_IP4_ROUTE(dest):

* Called from ip_route() (IPv4)

* Signature:\code{.c}

* struct netif *my_hook(const ip4_addr_t *dest);

* \endcode

* Arguments:

* - dest: destination IPv4 address

* Returns values:

* - the destination netif

* - NULL if no destination netif is found. In that case, ip_route() continues as normal.

#ifdef __DOXYGEN__

#define LWIP_HOOK_IP4_ROUTE()

#endif

/**

* LWIP_HOOK_IP4_ROUTE_SRC(src, dest):

* Source-based routing for IPv4 - called from ip_route() (IPv4)

* Signature:\code{.c}

* struct netif *my_hook(const ip4_addr_t *src, const ip4_addr_t *dest);

* \endcode

* Arguments:

* - src: local/source IPv4 address

* - dest: destination IPv4 address

* Returns values:

* - the destination netif

* - NULL if no destination netif is found. In that case, ip_route() continues as normal.

#ifdef __DOXYGEN__

#define LWIP_HOOK_IP4_ROUTE_SRC(src, dest)

#endif

/**

* LWIP_HOOK_IP4_CANFORWARD(src, dest):

* Check if an IPv4 can be forwarded - called from:

* ip4_input() -> ip4_forward() -> ip4_canforward() (IPv4)

* - source address is available via ip4_current_src_addr()

* - calling an output function in this context (e.g. multicast router) is allowed

* Signature:\code{.c}

* int my_hook(struct pbuf *p, u32_t dest_addr_hostorder);

* \endcode

* Arguments:

* - p: packet to forward

* - dest: destination IPv4 address

* Returns values:

* - 1: forward

* - 0: don't forward

* - -1: no decision. In that case, ip4_canforward() continues as normal.

#ifdef __DOXYGEN__

#define LWIP_HOOK_IP4_CANFORWARD(src, dest)

#endif

/**

* LWIP_HOOK_ETHARP_GET_GW(netif, dest):

* Called from etharp_output() (IPv4)

* Signature:\code{.c}

* const ip4_addr_t *my_hook(struct netif *netif, const ip4_addr_t *dest);

* \endcode

* Arguments:

* - netif: the netif used for sending

* - dest: the destination IPv4 address

* Return values:

* - the IPv4 address of the gateway to handle the specified destination IPv4 address

* - NULL, in which case the netif's default gateway is used

* The returned address MUST be directly reachable on the specified netif!

* This function is meant to implement advanced IPv4 routing together with

* LWIP_HOOK_IP4_ROUTE(). The actual routing/gateway table implementation is

* not part of lwIP but can e.g. be hidden in the netif's state argument.

#ifdef __DOXYGEN__

#define LWIP_HOOK_ETHARP_GET_GW(netif, dest)

#endif

/**

* LWIP_HOOK_IP6_INPUT(pbuf, input_netif):

* Called from ip6_input() (IPv6)

* Signature:\code{.c}

* int my_hook(struct pbuf *pbuf, struct netif *input_netif);

* \endcode

* Arguments:

* - pbuf: received struct pbuf passed to ip6_input()

* - input_netif: struct netif on which the packet has been received

* Return values:

* - 0: Hook has not consumed the packet, packet is processed as normal

* - != 0: Hook has consumed the packet.

* If the hook consumed the packet, 'pbuf' is in the responsibility of the hook

* (i.e. free it when done).

#ifdef __DOXYGEN__

#define LWIP_HOOK_IP6_INPUT(pbuf, input_netif)

#endif

/**

* LWIP_HOOK_IP6_ROUTE(src, dest):

* Called from ip_route() (IPv6)

* Signature:\code{.c}

* struct netif *my_hook(const ip6_addr_t *dest, const ip6_addr_t *src);

* \endcode

* Arguments:

* - src: source IPv6 address

* - dest: destination IPv6 address

* Return values:

* - the destination netif

* - NULL if no destination netif is found. In that case, ip6_route() continues as normal.

#ifdef __DOXYGEN__

#define LWIP_HOOK_IP6_ROUTE(src, dest)

#endif

/**

* LWIP_HOOK_ND6_GET_GW(netif, dest):

* Called from nd6_get_next_hop_entry() (IPv6)

* Signature:\code{.c}

* const ip6_addr_t *my_hook(struct netif *netif, const ip6_addr_t *dest);

* \endcode

* Arguments:

* - netif: the netif used for sending

* - dest: the destination IPv6 address

* Return values:

* - the IPv6 address of the next hop to handle the specified destination IPv6 address

* - NULL, in which case a NDP-discovered router is used instead

* The returned address MUST be directly reachable on the specified netif!

* This function is meant to implement advanced IPv6 routing together with

* LWIP_HOOK_IP6_ROUTE(). The actual routing/gateway table implementation is

* not part of lwIP but can e.g. be hidden in the netif's state argument.

#ifdef __DOXYGEN__

#define LWIP_HOOK_ND6_GET_GW(netif, dest)

#endif

/**

* LWIP_HOOK_VLAN_CHECK(netif, eth_hdr, vlan_hdr):

* Called from ethernet_input() if VLAN support is enabled

* Signature:\code{.c}

* int my_hook(struct netif *netif, struct eth_hdr *eth_hdr, struct eth_vlan_hdr *vlan_hdr);

* \endcode

* Arguments:

* - netif: struct netif on which the packet has been received

* - eth_hdr: struct eth_hdr of the packet

* - vlan_hdr: struct eth_vlan_hdr of the packet

* Return values:

* - 0: Packet must be dropped.

* - != 0: Packet must be accepted.

#ifdef __DOXYGEN__

#define LWIP_HOOK_VLAN_CHECK(netif, eth_hdr, vlan_hdr)

#endif

/**

* LWIP_HOOK_VLAN_SET:

* Hook can be used to set prio_vid field of vlan_hdr. If you need to store data

* on per-netif basis to implement this callback, see @ref netif_cd.

* Called from ethernet_output() if VLAN support (@ref ETHARP_SUPPORT_VLAN) is enabled.\n

* Signature:\code{.c}

* s32_t my_hook_vlan_set(struct netif* netif, struct pbuf* pbuf, const struct eth_addr* src, const struct eth_addr* dst, u16_t eth_type);\n

* \endcode

* Arguments:

* - netif: struct netif that the packet will be sent through

* - p: struct pbuf packet to be sent

* - src: source eth address

* - dst: destination eth address

* - eth_type: ethernet type to packet to be sent\n

* Return values:

* - <0: Packet shall not contain VLAN header.

* - 0 <= return value <= 0xFFFF: Packet shall contain VLAN header. Return value is prio_vid in host byte order.

#ifdef __DOXYGEN__

#define LWIP_HOOK_VLAN_SET(netif, p, src, dst, eth_type)

#endif

/**

* LWIP_HOOK_MEMP_AVAILABLE(memp_t_type):

* Called from memp_free() when a memp pool was empty and an item is now available

* Signature:\code{.c}

* void my_hook(memp_t type);

* \endcode

#ifdef __DOXYGEN__

#define LWIP_HOOK_MEMP_AVAILABLE(memp_t_type)

#endif

/**

* LWIP_HOOK_UNKNOWN_ETH_PROTOCOL(pbuf, netif):

* Called from ethernet_input() when an unknown eth type is encountered.

* Signature:\code{.c}

* err_t my_hook(struct pbuf* pbuf, struct netif* netif);

* \endcode

* Arguments:

* - p: rx packet with unknown eth type

* - netif: netif on which the packet has been received

* Return values:

* - ERR_OK if packet is accepted (hook function now owns the pbuf)

* - any error code otherwise (pbuf is freed)

* Payload points to ethernet header!

#ifdef __DOXYGEN__

#define LWIP_HOOK_UNKNOWN_ETH_PROTOCOL(pbuf, netif)

#endif

/**

* LWIP_HOOK_DHCP_APPEND_OPTIONS(netif, dhcp, state, msg, msg_type, options_len_ptr):

* Called from various dhcp functions when sending a DHCP message.

* This hook is called just before the DHCP message trailer is added, so the

* options are at the end of a DHCP message.

* Signature:\code{.c}

* void my_hook(struct netif *netif, struct dhcp *dhcp, u8_t state, struct dhcp_msg *msg,

* u8_t msg_type, u16_t *options_len_ptr);

* \endcode

* Arguments:

* - netif: struct netif that the packet will be sent through

* - dhcp: struct dhcp on that netif

* - state: current dhcp state (dhcp_state_enum_t as an u8_t)

* - msg: struct dhcp_msg that will be sent

* - msg_type: dhcp message type to be sent (u8_t)

* - options_len_ptr: pointer to the current length of options in the dhcp_msg "msg"

* (must be increased when options are added!)

* Options need to appended like this:

* LWIP_ASSERT("dhcp option overflow", *options_len_ptr + option_len + 2 <= DHCP_OPTIONS_LEN);

* msg->options[(*options_len_ptr)++] = <option_number>;

* msg->options[(*options_len_ptr)++] = <option_len>;

* msg->options[(*options_len_ptr)++] = <option_bytes>;

* [...]

#ifdef __DOXYGEN__

#define LWIP_HOOK_DHCP_APPEND_OPTIONS(netif, dhcp, state, msg, msg_type, options_len_ptr)

#endif

/**

* LWIP_HOOK_DHCP_PARSE_OPTION(netif, dhcp, state, msg, msg_type, option, len, pbuf, option_value_offset):

* Called from dhcp_parse_reply when receiving a DHCP message.

* This hook is called for every option in the received message that is not handled internally.

* Signature:\code{.c}

* void my_hook(struct netif *netif, struct dhcp *dhcp, u8_t state, struct dhcp_msg *msg,

* u8_t msg_type, u8_t option, u8_t option_len, struct pbuf *pbuf, u16_t option_value_offset);

* \endcode

* Arguments:

* - netif: struct netif that the packet will be sent through

* - dhcp: struct dhcp on that netif

* - state: current dhcp state (dhcp_state_enum_t as an u8_t)

* - msg: struct dhcp_msg that was received

* - msg_type: dhcp message type received (u8_t, ATTENTION: only valid after

* the message type option has been parsed!)

* - option: option value (u8_t)

* - len: option data length (u8_t)

* - pbuf: pbuf where option data is contained

* - option_value_offset: offset in pbuf where option data begins

* A nice way to get the option contents is pbuf_get_contiguous():

* u8_t buf[32];

* u8_t *ptr = (u8_t*)pbuf_get_contiguous(p, buf, sizeof(buf), LWIP_MIN(option_len, sizeof(buf)), offset);

#ifdef __DOXYGEN__

#define LWIP_HOOK_DHCP_PARSE_OPTION(netif, dhcp, state, msg, msg_type, option, len, pbuf, offset)

#endif

/**

* LWIP_HOOK_DHCP6_APPEND_OPTIONS(netif, dhcp6, state, msg, msg_type, options_len_ptr, max_len):

* Called from various dhcp6 functions when sending a DHCP6 message.

* This hook is called just before the DHCP6 message is sent, so the

* options are at the end of a DHCP6 message.

* Signature:\code{.c}

* void my_hook(struct netif *netif, struct dhcp6 *dhcp, u8_t state, struct dhcp6_msg *msg,

* u8_t msg_type, u16_t *options_len_ptr);

* \endcode

* Arguments:

* - netif: struct netif that the packet will be sent through

* - dhcp6: struct dhcp6 on that netif

* - state: current dhcp6 state (dhcp6_state_enum_t as an u8_t)

* - msg: struct dhcp6_msg that will be sent

* - msg_type: dhcp6 message type to be sent (u8_t)

* - options_len_ptr: pointer to the current length of options in the dhcp6_msg "msg"

* (must be increased when options are added!)

* Options need to appended like this:

* u8_t *options = (u8_t *)(msg + 1);

* LWIP_ASSERT("dhcp option overflow", sizeof(struct dhcp6_msg) + *options_len_ptr + newoptlen <= max_len);

* options[(*options_len_ptr)++] = <option_data>;

* [...]

#ifdef __DOXYGEN__

#define LWIP_HOOK_DHCP6_APPEND_OPTIONS(netif, dhcp6, state, msg, msg_type, options_len_ptr, max_len)

#endif

/**

* LWIP_HOOK_SOCKETS_SETSOCKOPT(s, sock, level, optname, optval, optlen, err)

* Called from socket API to implement setsockopt() for options not provided by lwIP.

* Core lock is held when this hook is called.

* Signature:\code{.c}

* int my_hook(int s, struct lwip_sock *sock, int level, int optname, const void *optval, socklen_t optlen, int *err)

* \endcode

* Arguments:

* - s: socket file descriptor

* - sock: internal socket descriptor (see lwip/priv/sockets_priv.h)

* - level: protocol level at which the option resides

* - optname: option to set

* - optval: value to set

* - optlen: size of optval

* - err: output error

* Return values:

* - 0: Hook has not consumed the option, code continues as normal (to internal options)

* - != 0: Hook has consumed the option, 'err' is returned

#ifdef __DOXYGEN__

#define LWIP_HOOK_SOCKETS_SETSOCKOPT(s, sock, level, optname, optval, optlen, err)

#endif

/**

* LWIP_HOOK_SOCKETS_GETSOCKOPT(s, sock, level, optname, optval, optlen, err)

* Called from socket API to implement getsockopt() for options not provided by lwIP.

* Core lock is held when this hook is called.

* Signature:\code{.c}

* int my_hook(int s, struct lwip_sock *sock, int level, int optname, void *optval, socklen_t *optlen, int *err)

* \endcode

* Arguments:

* - s: socket file descriptor

* - sock: internal socket descriptor (see lwip/priv/sockets_priv.h)

* - level: protocol level at which the option resides

* - optname: option to get

* - optval: value to get

* - optlen: size of optval

* - err: output error

* Return values:

* - 0: Hook has not consumed the option, code continues as normal (to internal options)

* - != 0: Hook has consumed the option, 'err' is returned

#ifdef __DOXYGEN__

#define LWIP_HOOK_SOCKETS_GETSOCKOPT(s, sock, level, optname, optval, optlen, err)

#endif

/**

* LWIP_HOOK_NETCONN_EXTERNAL_RESOLVE(name, addr, addrtype, err)

* Called from netconn APIs (not usable with callback apps) allowing an

* external DNS resolver (which uses sequential API) to handle the query.

* Signature:\code{.c}

* int my_hook(const char *name, ip_addr_t *addr, u8_t addrtype, err_t *err)

* \endcode

* Arguments:

* - name: hostname to resolve

* - addr: output host address

* - addrtype: type of address to query

* - err: output error

* Return values:

* - 0: Hook has not consumed hostname query, query continues into DNS module

* - != 0: Hook has consumed the query

* err must also be checked to determine if the hook consumed the query, but

* the query failed

#ifdef __DOXYGEN__

#define LWIP_HOOK_NETCONN_EXTERNAL_RESOLVE(name, addr, addrtype, err)

#endif

/**

* @}

---------------------------------------

---------- Debugging options ----------

---------------------------------------

/**

* @defgroup lwip_opts_debugmsg Debug messages

* @ingroup lwip_opts_debug

* @{

/**

* 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.

* @see debugging_levels

#if !defined LWIP_DBG_MIN_LEVEL || defined __DOXYGEN__

#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.

* @see debugging_levels

#if !defined LWIP_DBG_TYPES_ON || defined __DOXYGEN__

#define LWIP_DBG_TYPES_ON LWIP_DBG_ON

#endif

/**

* ETHARP_DEBUG: Enable debugging in etharp.c.

#if !defined ETHARP_DEBUG || defined __DOXYGEN__

#define ETHARP_DEBUG LWIP_DBG_OFF

#endif

/**

* NETIF_DEBUG: Enable debugging in netif.c.

#if !defined NETIF_DEBUG || defined __DOXYGEN__

#define NETIF_DEBUG LWIP_DBG_OFF

#endif

/**

* PBUF_DEBUG: Enable debugging in pbuf.c.

#if !defined PBUF_DEBUG || defined __DOXYGEN__

#define PBUF_DEBUG LWIP_DBG_OFF

#endif

/**

* API_LIB_DEBUG: Enable debugging in api_lib.c.

#if !defined API_LIB_DEBUG || defined __DOXYGEN__

#define API_LIB_DEBUG LWIP_DBG_OFF

#endif

/**

* API_MSG_DEBUG: Enable debugging in api_msg.c.

#if !defined API_MSG_DEBUG || defined __DOXYGEN__

#define API_MSG_DEBUG LWIP_DBG_OFF

#endif

/**

* SOCKETS_DEBUG: Enable debugging in sockets.c.

#if !defined SOCKETS_DEBUG || defined __DOXYGEN__

#define SOCKETS_DEBUG LWIP_DBG_OFF

#endif

/**

* ICMP_DEBUG: Enable debugging in icmp.c.

#if !defined ICMP_DEBUG || defined __DOXYGEN__

#define ICMP_DEBUG LWIP_DBG_OFF

#endif

/**

* IGMP_DEBUG: Enable debugging in igmp.c.

#if !defined IGMP_DEBUG || defined __DOXYGEN__

#define IGMP_DEBUG LWIP_DBG_OFF

#endif

/**

* INET_DEBUG: Enable debugging in inet.c.

#if !defined INET_DEBUG || defined __DOXYGEN__

#define INET_DEBUG LWIP_DBG_OFF

#endif

/**

* IP_DEBUG: Enable debugging for IP.

#if !defined IP_DEBUG || defined __DOXYGEN__

#define IP_DEBUG LWIP_DBG_OFF

#endif

/**

* IP_REASS_DEBUG: Enable debugging in ip_frag.c for both frag & reass.

#if !defined IP_REASS_DEBUG || defined __DOXYGEN__

#define IP_REASS_DEBUG LWIP_DBG_OFF

#endif

/**

* RAW_DEBUG: Enable debugging in raw.c.

#if !defined RAW_DEBUG || defined __DOXYGEN__

#define RAW_DEBUG LWIP_DBG_OFF

#endif

/**

* MEM_DEBUG: Enable debugging in mem.c.

#if !defined MEM_DEBUG || defined __DOXYGEN__

#define MEM_DEBUG LWIP_DBG_OFF

#endif

/**

* MEMP_DEBUG: Enable debugging in memp.c.

#if !defined MEMP_DEBUG || defined __DOXYGEN__

#define MEMP_DEBUG LWIP_DBG_OFF

#endif

/**

* SYS_DEBUG: Enable debugging in sys.c.

#if !defined SYS_DEBUG || defined __DOXYGEN__

#define SYS_DEBUG LWIP_DBG_OFF

#endif

/**

* TIMERS_DEBUG: Enable debugging in timers.c.

#if !defined TIMERS_DEBUG || defined __DOXYGEN__

#define TIMERS_DEBUG LWIP_DBG_OFF

#endif

/**

* TCP_DEBUG: Enable debugging for TCP.

#if !defined TCP_DEBUG || defined __DOXYGEN__

#define TCP_DEBUG LWIP_DBG_OFF

#endif

/**

* TCP_INPUT_DEBUG: Enable debugging in tcp_in.c for incoming debug.

#if !defined TCP_INPUT_DEBUG || defined __DOXYGEN__

#define TCP_INPUT_DEBUG LWIP_DBG_OFF

#endif

/**

* TCP_FR_DEBUG: Enable debugging in tcp_in.c for fast retransmit.

#if !defined TCP_FR_DEBUG || defined __DOXYGEN__

#define TCP_FR_DEBUG LWIP_DBG_OFF

#endif

/**

* TCP_RTO_DEBUG: Enable debugging in TCP for retransmit

* timeout.

#if !defined TCP_RTO_DEBUG || defined __DOXYGEN__

#define TCP_RTO_DEBUG LWIP_DBG_OFF

#endif

/**

* TCP_CWND_DEBUG: Enable debugging for TCP congestion window.

#if !defined TCP_CWND_DEBUG || defined __DOXYGEN__

#define TCP_CWND_DEBUG LWIP_DBG_OFF

#endif

/**

* TCP_WND_DEBUG: Enable debugging in tcp_in.c for window updating.

#if !defined TCP_WND_DEBUG || defined __DOXYGEN__

#define TCP_WND_DEBUG LWIP_DBG_OFF

#endif

/**

* TCP_OUTPUT_DEBUG: Enable debugging in tcp_out.c output functions.

#if !defined TCP_OUTPUT_DEBUG || defined __DOXYGEN__

#define TCP_OUTPUT_DEBUG LWIP_DBG_OFF

#endif

/**

* TCP_RST_DEBUG: Enable debugging for TCP with the RST message.

#if !defined TCP_RST_DEBUG || defined __DOXYGEN__

#define TCP_RST_DEBUG LWIP_DBG_OFF

#endif

/**

* TCP_QLEN_DEBUG: Enable debugging for TCP queue lengths.

#if !defined TCP_QLEN_DEBUG || defined __DOXYGEN__

#define TCP_QLEN_DEBUG LWIP_DBG_OFF

#endif

/**

* UDP_DEBUG: Enable debugging in UDP.

#if !defined UDP_DEBUG || defined __DOXYGEN__

#define UDP_DEBUG LWIP_DBG_OFF

#endif

/**

* TCPIP_DEBUG: Enable debugging in tcpip.c.

#if !defined TCPIP_DEBUG || defined __DOXYGEN__

#define TCPIP_DEBUG LWIP_DBG_OFF

#endif

/**

* SLIP_DEBUG: Enable debugging in slipif.c.

#if !defined SLIP_DEBUG || defined __DOXYGEN__

#define SLIP_DEBUG LWIP_DBG_OFF

#endif

/**

* DHCP_DEBUG: Enable debugging in dhcp.c.

#if !defined DHCP_DEBUG || defined __DOXYGEN__

#define DHCP_DEBUG LWIP_DBG_OFF

#endif

/**

* AUTOIP_DEBUG: Enable debugging in autoip.c.

#if !defined AUTOIP_DEBUG || defined __DOXYGEN__

#define AUTOIP_DEBUG LWIP_DBG_OFF

#endif

/**

* DNS_DEBUG: Enable debugging for DNS.

#if !defined DNS_DEBUG || defined __DOXYGEN__

#define DNS_DEBUG LWIP_DBG_OFF

#endif

/**

* IP6_DEBUG: Enable debugging for IPv6.

#if !defined IP6_DEBUG || defined __DOXYGEN__

#define IP6_DEBUG LWIP_DBG_OFF

#endif

/**

* DHCP6_DEBUG: Enable debugging in dhcp6.c.

#if !defined DHCP6_DEBUG || defined __DOXYGEN__

#define DHCP6_DEBUG LWIP_DBG_OFF

#endif

/**

* @}

/**

* LWIP_TESTMODE: Changes to make unit test possible

#if !defined LWIP_TESTMODE

#define LWIP_TESTMODE 0

#endif

--------------------------------------------------

---------- Performance tracking options ----------

--------------------------------------------------

/**

* @defgroup lwip_opts_perf Performance

* @ingroup lwip_opts_debug

* @{

/**

* LWIP_PERF: Enable performance testing for lwIP

* (if enabled, arch/perf.h is included)

#if !defined LWIP_PERF || defined __DOXYGEN__

#define LWIP_PERF 0

#endif

/**

* @}

#endif /* LWIP_HDR_OPT_H */

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

From:	saad saeed
Subject:	[lwip-users] lwip_accept: Givinng error -13 on accepting connection more than two tcp connections
Date:	Mon, 28 Jan 2019 08:31:13 +0000