4 * lwIP Options Configuration
8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
11 * Redistribution and use in source and binary forms, with or without modification,
12 * are permitted provided that the following conditions are met:
14 * 1. Redistributions of source code must retain the above copyright notice,
15 * this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright notice,
17 * this list of conditions and the following disclaimer in the documentation
18 * and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
33 * This file is part of the lwIP TCP/IP stack.
35 * Author: Adam Dunkels <adam@sics.se>
38 #ifndef __LWIP_OPT_H__
39 #define __LWIP_OPT_H__
42 * Include user defined options first. Anything not defined in these files
43 * will be set to standard values. Override anything you dont like!
46 #include "lwip/debug.h"
49 -----------------------------------------------
50 ---------- Platform specific locking ----------
51 -----------------------------------------------
55 * SYS_LIGHTWEIGHT_PROT==1: if you want inter-task protection for certain
56 * critical regions during buffer allocation, deallocation and memory
57 * allocation and deallocation.
59 #ifndef SYS_LIGHTWEIGHT_PROT
60 #define SYS_LIGHTWEIGHT_PROT 0
64 * NO_SYS==1: Provides VERY minimal functionality. Otherwise,
65 * use lwIP facilities.
72 * NO_SYS_NO_TIMERS==1: Drop support for sys_timeout when NO_SYS==1
73 * Mainly for compatibility to old versions.
75 #ifndef NO_SYS_NO_TIMERS
76 #define NO_SYS_NO_TIMERS 0
80 * MEMCPY: override this if you have a faster implementation at hand than the
81 * one included in your C library
84 #define MEMCPY(dst,src,len) memcpy(dst,src,len)
88 * SMEMCPY: override this with care! Some compilers (e.g. gcc) can inline a
89 * call to memcpy() if the length is known at compile time and is small.
92 #define SMEMCPY(dst,src,len) memcpy(dst,src,len)
96 ------------------------------------
97 ---------- Memory options ----------
98 ------------------------------------
101 * MEM_LIBC_MALLOC==1: Use malloc/free/realloc provided by your C-library
102 * instead of the lwip internal allocator. Can save code size if you
105 #ifndef MEM_LIBC_MALLOC
106 #define MEM_LIBC_MALLOC 0
110 * MEMP_MEM_MALLOC==1: Use mem_malloc/mem_free instead of the lwip pool allocator.
111 * Especially useful with MEM_LIBC_MALLOC but handle with care regarding execution
112 * speed and usage from interrupts!
114 #ifndef MEMP_MEM_MALLOC
115 #define MEMP_MEM_MALLOC 0
119 * MEM_ALIGNMENT: should be set to the alignment of the CPU
120 * 4 byte alignment -> #define MEM_ALIGNMENT 4
121 * 2 byte alignment -> #define MEM_ALIGNMENT 2
123 #ifndef MEM_ALIGNMENT
124 #define MEM_ALIGNMENT 1
128 * MEM_SIZE: the size of the heap memory. If the application will send
129 * a lot of data that needs to be copied, this should be set high.
132 #define MEM_SIZE 1600
136 * MEMP_SEPARATE_POOLS: if defined to 1, each pool is placed in its own array.
137 * This can be used to individually change the location of each pool.
138 * Default is one big array for all pools
140 #ifndef MEMP_SEPARATE_POOLS
141 #define MEMP_SEPARATE_POOLS 0
145 * MEMP_OVERFLOW_CHECK: memp overflow protection reserves a configurable
146 * amount of bytes before and after each memp element in every pool and fills
147 * it with a prominent default value.
148 * MEMP_OVERFLOW_CHECK == 0 no checking
149 * MEMP_OVERFLOW_CHECK == 1 checks each element when it is freed
150 * MEMP_OVERFLOW_CHECK >= 2 checks each element in every pool every time
151 * memp_malloc() or memp_free() is called (useful but slow!)
153 #ifndef MEMP_OVERFLOW_CHECK
154 #define MEMP_OVERFLOW_CHECK 0
158 * MEMP_SANITY_CHECK==1: run a sanity check after each memp_free() to make
159 * sure that there are no cycles in the linked lists.
161 #ifndef MEMP_SANITY_CHECK
162 #define MEMP_SANITY_CHECK 0
166 * MEM_USE_POOLS==1: Use an alternative to malloc() by allocating from a set
167 * of memory pools of various sizes. When mem_malloc is called, an element of
168 * the smallest pool that can provide the length needed is returned.
169 * To use this, MEMP_USE_CUSTOM_POOLS also has to be enabled.
171 #ifndef MEM_USE_POOLS
172 #define MEM_USE_POOLS 0
176 * MEM_USE_POOLS_TRY_BIGGER_POOL==1: if one malloc-pool is empty, try the next
177 * bigger pool - WARNING: THIS MIGHT WASTE MEMORY but it can make a system more
179 #ifndef MEM_USE_POOLS_TRY_BIGGER_POOL
180 #define MEM_USE_POOLS_TRY_BIGGER_POOL 0
184 * MEMP_USE_CUSTOM_POOLS==1: whether to include a user file lwippools.h
185 * that defines additional pools beyond the "standard" ones required
186 * by lwIP. If you set this to 1, you must have lwippools.h in your
187 * inlude path somewhere.
189 #ifndef MEMP_USE_CUSTOM_POOLS
190 #define MEMP_USE_CUSTOM_POOLS 0
194 * Set this to 1 if you want to free PBUF_RAM pbufs (or call mem_free()) from
195 * interrupt context (or another context that doesn't allow waiting for a
197 * If set to 1, mem_malloc will be protected by a semaphore and SYS_ARCH_PROTECT,
198 * while mem_free will only use SYS_ARCH_PROTECT. mem_malloc SYS_ARCH_UNPROTECTs
199 * with each loop so that mem_free can run.
201 * ATTENTION: As you can see from the above description, this leads to dis-/
202 * enabling interrupts often, which can be slow! Also, on low memory, mem_malloc
205 * If you don't want that, at least for NO_SYS=0, you can still use the following
206 * functions to enqueue a deallocation call which then runs in the tcpip_thread
208 * - pbuf_free_callback(p);
209 * - mem_free_callback(m);
211 #ifndef LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT
212 #define LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT 0
216 ------------------------------------------------
217 ---------- Internal Memory Pool Sizes ----------
218 ------------------------------------------------
221 * MEMP_NUM_PBUF: the number of memp struct pbufs (used for PBUF_ROM and PBUF_REF).
222 * If the application sends a lot of data out of ROM (or other static memory),
223 * this should be set high.
225 #ifndef MEMP_NUM_PBUF
226 #define MEMP_NUM_PBUF 16
230 * MEMP_NUM_RAW_PCB: Number of raw connection PCBs
231 * (requires the LWIP_RAW option)
233 #ifndef MEMP_NUM_RAW_PCB
234 #define MEMP_NUM_RAW_PCB 4
238 * MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
239 * per active UDP "connection".
240 * (requires the LWIP_UDP option)
242 #ifndef MEMP_NUM_UDP_PCB
243 #define MEMP_NUM_UDP_PCB 4
247 * MEMP_NUM_TCP_PCB: the number of simulatenously active TCP connections.
248 * (requires the LWIP_TCP option)
250 #ifndef MEMP_NUM_TCP_PCB
251 #define MEMP_NUM_TCP_PCB 5
255 * MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP connections.
256 * (requires the LWIP_TCP option)
258 #ifndef MEMP_NUM_TCP_PCB_LISTEN
259 #define MEMP_NUM_TCP_PCB_LISTEN 8
263 * MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP segments.
264 * (requires the LWIP_TCP option)
266 #ifndef MEMP_NUM_TCP_SEG
267 #define MEMP_NUM_TCP_SEG 16
271 * MEMP_NUM_REASSDATA: the number of IP packets simultaneously queued for
272 * reassembly (whole packets, not fragments!)
274 #ifndef MEMP_NUM_REASSDATA
275 #define MEMP_NUM_REASSDATA 5
279 * MEMP_NUM_FRAG_PBUF: the number of IP fragments simultaneously sent
280 * (fragments, not whole packets!).
281 * This is only used with IP_FRAG_USES_STATIC_BUF==0 and
282 * LWIP_NETIF_TX_SINGLE_PBUF==0 and only has to be > 1 with DMA-enabled MACs
283 * where the packet is not yet sent when netif->output returns.
285 #ifndef MEMP_NUM_FRAG_PBUF
286 #define MEMP_NUM_FRAG_PBUF 15
290 * MEMP_NUM_ARP_QUEUE: the number of simulateously queued outgoing
291 * packets (pbufs) that are waiting for an ARP request (to resolve
292 * their destination address) to finish.
293 * (requires the ARP_QUEUEING option)
295 #ifndef MEMP_NUM_ARP_QUEUE
296 #define MEMP_NUM_ARP_QUEUE 30
300 * MEMP_NUM_IGMP_GROUP: The number of multicast groups whose network interfaces
301 * can be members et the same time (one per netif - allsystems group -, plus one
302 * per netif membership).
303 * (requires the LWIP_IGMP option)
305 #ifndef MEMP_NUM_IGMP_GROUP
306 #define MEMP_NUM_IGMP_GROUP 8
310 * MEMP_NUM_SYS_TIMEOUT: the number of simulateously active timeouts.
311 * (requires NO_SYS==0)
313 #ifndef MEMP_NUM_SYS_TIMEOUT
314 #define MEMP_NUM_SYS_TIMEOUT 3
318 * MEMP_NUM_NETBUF: the number of struct netbufs.
319 * (only needed if you use the sequential API, like api_lib.c)
321 #ifndef MEMP_NUM_NETBUF
322 #define MEMP_NUM_NETBUF 2
326 * MEMP_NUM_NETCONN: the number of struct netconns.
327 * (only needed if you use the sequential API, like api_lib.c)
329 #ifndef MEMP_NUM_NETCONN
330 #define MEMP_NUM_NETCONN 4
334 * MEMP_NUM_TCPIP_MSG_API: the number of struct tcpip_msg, which are used
335 * for callback/timeout API communication.
336 * (only needed if you use tcpip.c)
338 #ifndef MEMP_NUM_TCPIP_MSG_API
339 #define MEMP_NUM_TCPIP_MSG_API 8
343 * MEMP_NUM_TCPIP_MSG_INPKT: the number of struct tcpip_msg, which are used
344 * for incoming packets.
345 * (only needed if you use tcpip.c)
347 #ifndef MEMP_NUM_TCPIP_MSG_INPKT
348 #define MEMP_NUM_TCPIP_MSG_INPKT 8
352 * MEMP_NUM_SNMP_NODE: the number of leafs in the SNMP tree.
354 #ifndef MEMP_NUM_SNMP_NODE
355 #define MEMP_NUM_SNMP_NODE 50
359 * MEMP_NUM_SNMP_ROOTNODE: the number of branches in the SNMP tree.
360 * Every branch has one leaf (MEMP_NUM_SNMP_NODE) at least!
362 #ifndef MEMP_NUM_SNMP_ROOTNODE
363 #define MEMP_NUM_SNMP_ROOTNODE 30
367 * MEMP_NUM_SNMP_VARBIND: the number of concurrent requests (does not have to
368 * be changed normally) - 2 of these are used per request (1 for input,
371 #ifndef MEMP_NUM_SNMP_VARBIND
372 #define MEMP_NUM_SNMP_VARBIND 2
376 * MEMP_NUM_SNMP_VALUE: the number of OID or values concurrently used
377 * (does not have to be changed normally) - 3 of these are used per request
378 * (1 for the value read and 2 for OIDs - input and output)
380 #ifndef MEMP_NUM_SNMP_VALUE
381 #define MEMP_NUM_SNMP_VALUE 3
385 * MEMP_NUM_NETDB: the number of concurrently running lwip_addrinfo() calls
386 * (before freeing the corresponding memory using lwip_freeaddrinfo()).
388 #ifndef MEMP_NUM_NETDB
389 #define MEMP_NUM_NETDB 1
393 * MEMP_NUM_LOCALHOSTLIST: the number of host entries in the local host list
394 * if DNS_LOCAL_HOSTLIST_IS_DYNAMIC==1.
396 #ifndef MEMP_NUM_LOCALHOSTLIST
397 #define MEMP_NUM_LOCALHOSTLIST 1
401 * MEMP_NUM_PPPOE_INTERFACES: the number of concurrently active PPPoE
402 * interfaces (only used with PPPOE_SUPPORT==1)
404 #ifndef MEMP_NUM_PPPOE_INTERFACES
405 #define MEMP_NUM_PPPOE_INTERFACES 1
409 * PBUF_POOL_SIZE: the number of buffers in the pbuf pool.
411 #ifndef PBUF_POOL_SIZE
412 #define PBUF_POOL_SIZE 16
416 ---------------------------------
417 ---------- ARP options ----------
418 ---------------------------------
421 * LWIP_ARP==1: Enable ARP functionality.
428 * ARP_TABLE_SIZE: Number of active MAC-IP address pairs cached.
430 #ifndef ARP_TABLE_SIZE
431 #define ARP_TABLE_SIZE 10
435 * ARP_QUEUEING==1: Multiple outgoing packets are queued during hardware address
436 * resolution. By default, only the most recent packet is queued per IP address.
437 * This is sufficient for most protocols and mainly reduces TCP connection
438 * startup time. Set this to 1 if you know your application sends more than one
439 * packet in a row to an IP address that is not in the ARP cache.
442 #define ARP_QUEUEING 0
446 * ETHARP_TRUST_IP_MAC==1: Incoming IP packets cause the ARP table to be
447 * updated with the source MAC and IP addresses supplied in the packet.
448 * You may want to disable this if you do not trust LAN peers to have the
449 * correct addresses, or as a limited approach to attempt to handle
450 * spoofing. If disabled, lwIP will need to make a new ARP request if
451 * the peer is not already in the ARP table, adding a little latency.
452 * The peer *is* in the ARP table if it requested our address before.
453 * Also notice that this slows down input processing of every IP packet!
455 #ifndef ETHARP_TRUST_IP_MAC
456 #define ETHARP_TRUST_IP_MAC 0
460 * ETHARP_SUPPORT_VLAN==1: support receiving ethernet packets with VLAN header.
461 * Additionally, you can define ETHARP_VLAN_CHECK to an u16_t VLAN ID to check.
462 * If ETHARP_VLAN_CHECK is defined, only VLAN-traffic for this VLAN is accepted.
463 * If ETHARP_VLAN_CHECK is not defined, all traffic is accepted.
464 * Alternatively, define a function/define ETHARP_VLAN_CHECK_FN(eth_hdr, vlan)
465 * that returns 1 to accept a packet or 0 to drop a packet.
467 #ifndef ETHARP_SUPPORT_VLAN
468 #define ETHARP_SUPPORT_VLAN 0
471 /** LWIP_ETHERNET==1: enable ethernet support for PPPoE even though ARP
474 #ifndef LWIP_ETHERNET
475 #define LWIP_ETHERNET (LWIP_ARP || PPPOE_SUPPORT)
478 /** ETH_PAD_SIZE: number of bytes added before the ethernet header to ensure
479 * alignment of payload after that header. Since the header is 14 bytes long,
480 * without this padding e.g. addresses in the IP header will not be aligned
481 * on a 32-bit boundary, so setting this to 2 can speed up 32-bit-platforms.
484 #define ETH_PAD_SIZE 0
487 /** ETHARP_SUPPORT_STATIC_ENTRIES==1: enable code to support static ARP table
488 * entries (using etharp_add_static_entry/etharp_remove_static_entry).
490 #ifndef ETHARP_SUPPORT_STATIC_ENTRIES
491 #define ETHARP_SUPPORT_STATIC_ENTRIES 0
496 --------------------------------
497 ---------- IP options ----------
498 --------------------------------
501 * IP_FORWARD==1: Enables the ability to forward IP packets across network
502 * interfaces. If you are going to run lwIP on a device with only one network
503 * interface, define this to 0.
510 * IP_OPTIONS_ALLOWED: Defines the behavior for IP options.
511 * IP_OPTIONS_ALLOWED==0: All packets with IP options are dropped.
512 * IP_OPTIONS_ALLOWED==1: IP options are allowed (but not parsed).
514 #ifndef IP_OPTIONS_ALLOWED
515 #define IP_OPTIONS_ALLOWED 1
519 * IP_REASSEMBLY==1: Reassemble incoming fragmented IP packets. Note that
520 * this option does not affect outgoing packet sizes, which can be controlled
523 #ifndef IP_REASSEMBLY
524 #define IP_REASSEMBLY 1
528 * IP_FRAG==1: Fragment outgoing IP packets if their size exceeds MTU. Note
529 * that this option does not affect incoming packet sizes, which can be
530 * controlled via IP_REASSEMBLY.
537 * IP_REASS_MAXAGE: Maximum time (in multiples of IP_TMR_INTERVAL - so seconds, normally)
538 * a fragmented IP packet waits for all fragments to arrive. If not all fragments arrived
539 * in this time, the whole packet is discarded.
541 #ifndef IP_REASS_MAXAGE
542 #define IP_REASS_MAXAGE 3
546 * IP_REASS_MAX_PBUFS: Total maximum amount of pbufs waiting to be reassembled.
547 * Since the received pbufs are enqueued, be sure to configure
548 * PBUF_POOL_SIZE > IP_REASS_MAX_PBUFS so that the stack is still able to receive
549 * packets even if the maximum amount of fragments is enqueued for reassembly!
551 #ifndef IP_REASS_MAX_PBUFS
552 #define IP_REASS_MAX_PBUFS 10
556 * IP_FRAG_USES_STATIC_BUF==1: Use a static MTU-sized buffer for IP
557 * fragmentation. Otherwise pbufs are allocated and reference the original
558 * packet data to be fragmented (or with LWIP_NETIF_TX_SINGLE_PBUF==1,
559 * new PBUF_RAM pbufs are used for fragments).
560 * ATTENTION: IP_FRAG_USES_STATIC_BUF==1 may not be used for DMA-enabled MACs!
562 #ifndef IP_FRAG_USES_STATIC_BUF
563 #define IP_FRAG_USES_STATIC_BUF 0
567 * IP_FRAG_MAX_MTU: Assumed max MTU on any interface for IP frag buffer
568 * (requires IP_FRAG_USES_STATIC_BUF==1)
570 #if IP_FRAG_USES_STATIC_BUF && !defined(IP_FRAG_MAX_MTU)
571 #define IP_FRAG_MAX_MTU 1500
575 * IP_DEFAULT_TTL: Default value for Time-To-Live used by transport layers.
577 #ifndef IP_DEFAULT_TTL
578 #define IP_DEFAULT_TTL 255
582 * IP_SOF_BROADCAST=1: Use the SOF_BROADCAST field to enable broadcast
583 * filter per pcb on udp and raw send operations. To enable broadcast filter
584 * on recv operations, you also have to set IP_SOF_BROADCAST_RECV=1.
586 #ifndef IP_SOF_BROADCAST
587 #define IP_SOF_BROADCAST 0
591 * IP_SOF_BROADCAST_RECV (requires IP_SOF_BROADCAST=1) enable the broadcast
592 * filter on recv operations.
594 #ifndef IP_SOF_BROADCAST_RECV
595 #define IP_SOF_BROADCAST_RECV 0
599 * IP_FORWARD_ALLOW_TX_ON_RX_NETIF==1: allow ip_forward() to send packets back
600 * out on the netif where it was received. This should only be used for
602 * ATTENTION: When this is 1, make sure your netif driver correctly marks incoming
603 * link-layer-broadcast/multicast packets as such using the corresponding pbuf flags!
605 #ifndef IP_FORWARD_ALLOW_TX_ON_RX_NETIF
606 #define IP_FORWARD_ALLOW_TX_ON_RX_NETIF 0
610 * LWIP_RANDOMIZE_INITIAL_LOCAL_PORTS==1: randomize the local port for the first
611 * local TCP/UDP pcb (default==0). This can prevent creating predictable port
612 * numbers after booting a device.
614 #ifndef LWIP_RANDOMIZE_INITIAL_LOCAL_PORTS
615 #define LWIP_RANDOMIZE_INITIAL_LOCAL_PORTS 0
619 ----------------------------------
620 ---------- ICMP options ----------
621 ----------------------------------
624 * LWIP_ICMP==1: Enable ICMP module inside the IP stack.
625 * Be careful, disable that make your product non-compliant to RFC1122
632 * ICMP_TTL: Default value for Time-To-Live used by ICMP packets.
635 #define ICMP_TTL (IP_DEFAULT_TTL)
639 * LWIP_BROADCAST_PING==1: respond to broadcast pings (default is unicast only)
641 #ifndef LWIP_BROADCAST_PING
642 #define LWIP_BROADCAST_PING 0
646 * LWIP_MULTICAST_PING==1: respond to multicast pings (default is unicast only)
648 #ifndef LWIP_MULTICAST_PING
649 #define LWIP_MULTICAST_PING 0
653 ---------------------------------
654 ---------- RAW options ----------
655 ---------------------------------
658 * LWIP_RAW==1: Enable application layer to hook into the IP layer itself.
665 * LWIP_RAW==1: Enable application layer to hook into the IP layer itself.
668 #define RAW_TTL (IP_DEFAULT_TTL)
672 ----------------------------------
673 ---------- DHCP options ----------
674 ----------------------------------
677 * LWIP_DHCP==1: Enable DHCP module.
684 * DHCP_DOES_ARP_CHECK==1: Do an ARP check on the offered address.
686 #ifndef DHCP_DOES_ARP_CHECK
687 #define DHCP_DOES_ARP_CHECK ((LWIP_DHCP) && (LWIP_ARP))
691 ------------------------------------
692 ---------- AUTOIP options ----------
693 ------------------------------------
696 * LWIP_AUTOIP==1: Enable AUTOIP module.
699 #define LWIP_AUTOIP 0
703 * LWIP_DHCP_AUTOIP_COOP==1: Allow DHCP and AUTOIP to be both enabled on
704 * the same interface at the same time.
706 #ifndef LWIP_DHCP_AUTOIP_COOP
707 #define LWIP_DHCP_AUTOIP_COOP 0
711 * LWIP_DHCP_AUTOIP_COOP_TRIES: Set to the number of DHCP DISCOVER probes
712 * that should be sent before falling back on AUTOIP. This can be set
713 * as low as 1 to get an AutoIP address very quickly, but you should
714 * be prepared to handle a changing IP address when DHCP overrides
717 #ifndef LWIP_DHCP_AUTOIP_COOP_TRIES
718 #define LWIP_DHCP_AUTOIP_COOP_TRIES 9
722 ----------------------------------
723 ---------- SNMP options ----------
724 ----------------------------------
727 * LWIP_SNMP==1: Turn on SNMP module. UDP must be available for SNMP
735 * SNMP_CONCURRENT_REQUESTS: Number of concurrent requests the module will
736 * allow. At least one request buffer is required.
737 * Does not have to be changed unless external MIBs answer request asynchronously
739 #ifndef SNMP_CONCURRENT_REQUESTS
740 #define SNMP_CONCURRENT_REQUESTS 1
744 * SNMP_TRAP_DESTINATIONS: Number of trap destinations. At least one trap
745 * destination is required
747 #ifndef SNMP_TRAP_DESTINATIONS
748 #define SNMP_TRAP_DESTINATIONS 1
753 * When using a private MIB, you have to create a file 'private_mib.h' that contains
754 * a 'struct mib_array_node mib_private' which contains your MIB.
756 #ifndef SNMP_PRIVATE_MIB
757 #define SNMP_PRIVATE_MIB 0
761 * Only allow SNMP write actions that are 'safe' (e.g. disabeling netifs is not
762 * a safe action and disabled when SNMP_SAFE_REQUESTS = 1).
763 * Unsafe requests are disabled by default!
765 #ifndef SNMP_SAFE_REQUESTS
766 #define SNMP_SAFE_REQUESTS 1
770 * The maximum length of strings used. This affects the size of
771 * MEMP_SNMP_VALUE elements.
773 #ifndef SNMP_MAX_OCTET_STRING_LEN
774 #define SNMP_MAX_OCTET_STRING_LEN 127
778 * The maximum depth of the SNMP tree.
779 * With private MIBs enabled, this depends on your MIB!
780 * This affects the size of MEMP_SNMP_VALUE elements.
782 #ifndef SNMP_MAX_TREE_DEPTH
783 #define SNMP_MAX_TREE_DEPTH 15
787 * The size of the MEMP_SNMP_VALUE elements, normally calculated from
788 * SNMP_MAX_OCTET_STRING_LEN and SNMP_MAX_TREE_DEPTH.
790 #ifndef SNMP_MAX_VALUE_SIZE
791 #define SNMP_MAX_VALUE_SIZE LWIP_MAX((SNMP_MAX_OCTET_STRING_LEN)+1, sizeof(s32_t)*(SNMP_MAX_TREE_DEPTH))
795 ----------------------------------
796 ---------- IGMP options ----------
797 ----------------------------------
800 * LWIP_IGMP==1: Turn on IGMP module.
807 ----------------------------------
808 ---------- DNS options -----------
809 ----------------------------------
812 * LWIP_DNS==1: Turn on DNS module. UDP must be available for DNS
819 /** DNS maximum number of entries to maintain locally. */
820 #ifndef DNS_TABLE_SIZE
821 #define DNS_TABLE_SIZE 4
824 /** DNS maximum host name length supported in the name table. */
825 #ifndef DNS_MAX_NAME_LENGTH
826 #define DNS_MAX_NAME_LENGTH 256
829 /** The maximum of DNS servers */
830 #ifndef DNS_MAX_SERVERS
831 #define DNS_MAX_SERVERS 2
834 /** DNS do a name checking between the query and the response. */
835 #ifndef DNS_DOES_NAME_CHECK
836 #define DNS_DOES_NAME_CHECK 1
839 /** DNS message max. size. Default value is RFC compliant. */
841 #define DNS_MSG_SIZE 512
844 /** DNS_LOCAL_HOSTLIST: Implements a local host-to-address list. If enabled,
846 * #define DNS_LOCAL_HOSTLIST_INIT {{"host1", 0x123}, {"host2", 0x234}}
847 * (an array of structs name/address, where address is an u32_t in network
850 * Instead, you can also use an external function:
851 * #define DNS_LOOKUP_LOCAL_EXTERN(x) extern u32_t my_lookup_function(const char *name)
852 * that returns the IP address or INADDR_NONE if not found.
854 #ifndef DNS_LOCAL_HOSTLIST
855 #define DNS_LOCAL_HOSTLIST 0
856 #endif /* DNS_LOCAL_HOSTLIST */
858 /** If this is turned on, the local host-list can be dynamically changed
860 #ifndef DNS_LOCAL_HOSTLIST_IS_DYNAMIC
861 #define DNS_LOCAL_HOSTLIST_IS_DYNAMIC 0
862 #endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */
865 ---------------------------------
866 ---------- UDP options ----------
867 ---------------------------------
870 * LWIP_UDP==1: Turn on UDP.
877 * LWIP_UDPLITE==1: Turn on UDP-Lite. (Requires LWIP_UDP)
880 #define LWIP_UDPLITE 0
884 * UDP_TTL: Default Time-To-Live value.
887 #define UDP_TTL (IP_DEFAULT_TTL)
891 * LWIP_NETBUF_RECVINFO==1: append destination addr and port to every netbuf.
893 #ifndef LWIP_NETBUF_RECVINFO
894 #define LWIP_NETBUF_RECVINFO 0
898 ---------------------------------
899 ---------- TCP options ----------
900 ---------------------------------
903 * LWIP_TCP==1: Turn on TCP.
910 * TCP_TTL: Default Time-To-Live value.
913 #define TCP_TTL (IP_DEFAULT_TTL)
917 * TCP_WND: The size of a TCP window. This must be at least
918 * (2 * TCP_MSS) for things to work well
921 #define TCP_WND (4 * TCP_MSS)
925 * TCP_MAXRTX: Maximum number of retransmissions of data segments.
928 #define TCP_MAXRTX 12
932 * TCP_SYNMAXRTX: Maximum number of retransmissions of SYN segments.
934 #ifndef TCP_SYNMAXRTX
935 #define TCP_SYNMAXRTX 6
939 * TCP_QUEUE_OOSEQ==1: TCP will queue segments that arrive out of order.
940 * Define to 0 if your device is low on memory.
942 #ifndef TCP_QUEUE_OOSEQ
943 #define TCP_QUEUE_OOSEQ (LWIP_TCP)
947 * TCP_MSS: TCP Maximum segment size. (default is 536, a conservative default,
948 * you might want to increase this.)
949 * For the receive side, this MSS is advertised to the remote side
950 * when opening a connection. For the transmit size, this MSS sets
951 * an upper limit on the MSS advertised by the remote host.
958 * TCP_CALCULATE_EFF_SEND_MSS: "The maximum size of a segment that TCP really
959 * sends, the 'effective send MSS,' MUST be the smaller of the send MSS (which
960 * reflects the available reassembly buffer size at the remote host) and the
961 * largest size permitted by the IP layer" (RFC 1122)
962 * Setting this to 1 enables code that checks TCP_MSS against the MTU of the
963 * netif used for a connection and limits the MSS if it would be too big otherwise.
965 #ifndef TCP_CALCULATE_EFF_SEND_MSS
966 #define TCP_CALCULATE_EFF_SEND_MSS 1
971 * TCP_SND_BUF: TCP sender buffer space (bytes).
972 * To achieve good performance, this should be at least 2 * TCP_MSS.
975 #define TCP_SND_BUF (2 * TCP_MSS)
979 * TCP_SND_QUEUELEN: TCP sender buffer space (pbufs). This must be at least
980 * as much as (2 * TCP_SND_BUF/TCP_MSS) for things to work.
982 #ifndef TCP_SND_QUEUELEN
983 #define TCP_SND_QUEUELEN ((4 * (TCP_SND_BUF) + (TCP_MSS - 1))/(TCP_MSS))
987 * TCP_SNDLOWAT: TCP writable space (bytes). This must be less than
988 * TCP_SND_BUF. It is the amount of space which must be available in the
989 * TCP snd_buf for select to return writable (combined with TCP_SNDQUEUELOWAT).
992 #define TCP_SNDLOWAT ((TCP_SND_BUF)/2)
996 * TCP_SNDQUEUELOWAT: TCP writable bufs (pbuf count). This must be less
997 * than TCP_SND_QUEUELEN. If the number of pbufs queued on a pcb drops below
998 * this number, select returns writable (combined with TCP_SNDLOWAT).
1000 #ifndef TCP_SNDQUEUELOWAT
1001 #define TCP_SNDQUEUELOWAT ((TCP_SND_QUEUELEN)/2)
1005 * TCP_LISTEN_BACKLOG: Enable the backlog option for tcp listen pcb.
1007 #ifndef TCP_LISTEN_BACKLOG
1008 #define TCP_LISTEN_BACKLOG 0
1012 * The maximum allowed backlog for TCP listen netconns.
1013 * This backlog is used unless another is explicitly specified.
1014 * 0xff is the maximum (u8_t).
1016 #ifndef TCP_DEFAULT_LISTEN_BACKLOG
1017 #define TCP_DEFAULT_LISTEN_BACKLOG 0xff
1021 * TCP_OVERSIZE: The maximum number of bytes that tcp_write may
1022 * allocate ahead of time in an attempt to create shorter pbuf chains
1023 * for transmission. The meaningful range is 0 to TCP_MSS. Some
1024 * suggested values are:
1026 * 0: Disable oversized allocation. Each tcp_write() allocates a new
1027 pbuf (old behaviour).
1028 * 1: Allocate size-aligned pbufs with minimal excess. Use this if your
1029 * scatter-gather DMA requires aligned fragments.
1030 * 128: Limit the pbuf/memory overhead to 20%.
1031 * TCP_MSS: Try to create unfragmented TCP packets.
1032 * TCP_MSS/4: Try to create 4 fragments or less per TCP packet.
1034 #ifndef TCP_OVERSIZE
1035 #define TCP_OVERSIZE TCP_MSS
1039 * LWIP_TCP_TIMESTAMPS==1: support the TCP timestamp option.
1041 #ifndef LWIP_TCP_TIMESTAMPS
1042 #define LWIP_TCP_TIMESTAMPS 0
1046 * TCP_WND_UPDATE_THRESHOLD: difference in window to trigger an
1047 * explicit window update
1049 #ifndef TCP_WND_UPDATE_THRESHOLD
1050 #define TCP_WND_UPDATE_THRESHOLD (TCP_WND / 4)
1054 * LWIP_EVENT_API and LWIP_CALLBACK_API: Only one of these should be set to 1.
1055 * LWIP_EVENT_API==1: The user defines lwip_tcp_event() to receive all
1056 * events (accept, sent, etc) that happen in the system.
1057 * LWIP_CALLBACK_API==1: The PCB callback function is called directly
1058 * for the event. This is the default.
1060 #if !defined(LWIP_EVENT_API) && !defined(LWIP_CALLBACK_API)
1061 #define LWIP_EVENT_API 0
1062 #define LWIP_CALLBACK_API 1
1067 ----------------------------------
1068 ---------- Pbuf options ----------
1069 ----------------------------------
1072 * PBUF_LINK_HLEN: the number of bytes that should be allocated for a
1073 * link level header. The default is 14, the standard value for
1076 #ifndef PBUF_LINK_HLEN
1077 #define PBUF_LINK_HLEN (14 + ETH_PAD_SIZE)
1081 * PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. The default is
1082 * designed to accomodate single full size TCP frame in one pbuf, including
1083 * TCP_MSS, IP header, and link header.
1085 #ifndef PBUF_POOL_BUFSIZE
1086 #define PBUF_POOL_BUFSIZE LWIP_MEM_ALIGN_SIZE(TCP_MSS+40+PBUF_LINK_HLEN)
1090 ------------------------------------------------
1091 ---------- Network Interfaces options ----------
1092 ------------------------------------------------
1095 * LWIP_NETIF_HOSTNAME==1: use DHCP_OPTION_HOSTNAME with netif's hostname
1098 #ifndef LWIP_NETIF_HOSTNAME
1099 #define LWIP_NETIF_HOSTNAME 0
1103 * LWIP_NETIF_API==1: Support netif api (in netifapi.c)
1105 #ifndef LWIP_NETIF_API
1106 #define LWIP_NETIF_API 0
1110 * LWIP_NETIF_STATUS_CALLBACK==1: Support a callback function whenever an interface
1111 * changes its up/down status (i.e., due to DHCP IP acquistion)
1113 #ifndef LWIP_NETIF_STATUS_CALLBACK
1114 #define LWIP_NETIF_STATUS_CALLBACK 0
1118 * LWIP_NETIF_LINK_CALLBACK==1: Support a callback function from an interface
1119 * whenever the link changes (i.e., link down)
1121 #ifndef LWIP_NETIF_LINK_CALLBACK
1122 #define LWIP_NETIF_LINK_CALLBACK 0
1126 * LWIP_NETIF_REMOVE_CALLBACK==1: Support a callback function that is called
1127 * when a netif has been removed
1129 #ifndef LWIP_NETIF_REMOVE_CALLBACK
1130 #define LWIP_NETIF_REMOVE_CALLBACK 0
1134 * LWIP_NETIF_HWADDRHINT==1: Cache link-layer-address hints (e.g. table
1135 * indices) in struct netif. TCP and UDP can make use of this to prevent
1136 * scanning the ARP table for every sent packet. While this is faster for big
1137 * ARP tables or many concurrent connections, it might be counterproductive
1138 * if you have a tiny ARP table or if there never are concurrent connections.
1140 #ifndef LWIP_NETIF_HWADDRHINT
1141 #define LWIP_NETIF_HWADDRHINT 0
1145 * LWIP_NETIF_LOOPBACK==1: Support sending packets with a destination IP
1146 * address equal to the netif IP address, looping them back up the stack.
1148 #ifndef LWIP_NETIF_LOOPBACK
1149 #define LWIP_NETIF_LOOPBACK 0
1153 * LWIP_LOOPBACK_MAX_PBUFS: Maximum number of pbufs on queue for loopback
1154 * sending for each netif (0 = disabled)
1156 #ifndef LWIP_LOOPBACK_MAX_PBUFS
1157 #define LWIP_LOOPBACK_MAX_PBUFS 0
1161 * LWIP_NETIF_LOOPBACK_MULTITHREADING: Indicates whether threading is enabled in
1162 * the system, as netifs must change how they behave depending on this setting
1163 * for the LWIP_NETIF_LOOPBACK option to work.
1164 * Setting this is needed to avoid reentering non-reentrant functions like
1166 * LWIP_NETIF_LOOPBACK_MULTITHREADING==1: Indicates that the user is using a
1167 * multithreaded environment like tcpip.c. In this case, netif->input()
1168 * is called directly.
1169 * LWIP_NETIF_LOOPBACK_MULTITHREADING==0: Indicates a polling (or NO_SYS) setup.
1170 * The packets are put on a list and netif_poll() must be called in
1171 * the main application loop.
1173 #ifndef LWIP_NETIF_LOOPBACK_MULTITHREADING
1174 #define LWIP_NETIF_LOOPBACK_MULTITHREADING (!NO_SYS)
1178 * LWIP_NETIF_TX_SINGLE_PBUF: if this is set to 1, lwIP tries to put all data
1179 * to be sent into one single pbuf. This is for compatibility with DMA-enabled
1180 * MACs that do not support scatter-gather.
1181 * Beware that this might involve CPU-memcpy before transmitting that would not
1182 * be needed without this flag! Use this only if you need to!
1184 * @todo: TCP and IP-frag do not work with this, yet:
1186 #ifndef LWIP_NETIF_TX_SINGLE_PBUF
1187 #define LWIP_NETIF_TX_SINGLE_PBUF 0
1188 #endif /* LWIP_NETIF_TX_SINGLE_PBUF */
1191 ------------------------------------
1192 ---------- LOOPIF options ----------
1193 ------------------------------------
1196 * LWIP_HAVE_LOOPIF==1: Support loop interface (127.0.0.1) and loopif.c
1198 #ifndef LWIP_HAVE_LOOPIF
1199 #define LWIP_HAVE_LOOPIF 0
1203 ------------------------------------
1204 ---------- SLIPIF options ----------
1205 ------------------------------------
1208 * LWIP_HAVE_SLIPIF==1: Support slip interface and slipif.c
1210 #ifndef LWIP_HAVE_SLIPIF
1211 #define LWIP_HAVE_SLIPIF 0
1215 ------------------------------------
1216 ---------- Thread options ----------
1217 ------------------------------------
1220 * TCPIP_THREAD_NAME: The name assigned to the main tcpip thread.
1222 #ifndef TCPIP_THREAD_NAME
1223 #define TCPIP_THREAD_NAME "tcpip_thread"
1227 * TCPIP_THREAD_STACKSIZE: The stack size used by the main tcpip thread.
1228 * The stack size value itself is platform-dependent, but is passed to
1229 * sys_thread_new() when the thread is created.
1231 #ifndef TCPIP_THREAD_STACKSIZE
1232 #define TCPIP_THREAD_STACKSIZE 0
1236 * TCPIP_THREAD_PRIO: The priority assigned to the main tcpip thread.
1237 * The priority value itself is platform-dependent, but is passed to
1238 * sys_thread_new() when the thread is created.
1240 #ifndef TCPIP_THREAD_PRIO
1241 #define TCPIP_THREAD_PRIO 1
1245 * TCPIP_MBOX_SIZE: The mailbox size for the tcpip thread messages
1246 * The queue size value itself is platform-dependent, but is passed to
1247 * sys_mbox_new() when tcpip_init is called.
1249 #ifndef TCPIP_MBOX_SIZE
1250 #define TCPIP_MBOX_SIZE 0
1254 * SLIPIF_THREAD_NAME: The name assigned to the slipif_loop thread.
1256 #ifndef SLIPIF_THREAD_NAME
1257 #define SLIPIF_THREAD_NAME "slipif_loop"
1261 * SLIP_THREAD_STACKSIZE: The stack size used by the slipif_loop thread.
1262 * The stack size value itself is platform-dependent, but is passed to
1263 * sys_thread_new() when the thread is created.
1265 #ifndef SLIPIF_THREAD_STACKSIZE
1266 #define SLIPIF_THREAD_STACKSIZE 0
1270 * SLIPIF_THREAD_PRIO: The priority assigned to the slipif_loop thread.
1271 * The priority value itself is platform-dependent, but is passed to
1272 * sys_thread_new() when the thread is created.
1274 #ifndef SLIPIF_THREAD_PRIO
1275 #define SLIPIF_THREAD_PRIO 1
1279 * PPP_THREAD_NAME: The name assigned to the pppInputThread.
1281 #ifndef PPP_THREAD_NAME
1282 #define PPP_THREAD_NAME "pppInputThread"
1286 * PPP_THREAD_STACKSIZE: The stack size used by the pppInputThread.
1287 * The stack size value itself is platform-dependent, but is passed to
1288 * sys_thread_new() when the thread is created.
1290 #ifndef PPP_THREAD_STACKSIZE
1291 #define PPP_THREAD_STACKSIZE 0
1295 * PPP_THREAD_PRIO: The priority assigned to the pppInputThread.
1296 * The priority value itself is platform-dependent, but is passed to
1297 * sys_thread_new() when the thread is created.
1299 #ifndef PPP_THREAD_PRIO
1300 #define PPP_THREAD_PRIO 1
1304 * DEFAULT_THREAD_NAME: The name assigned to any other lwIP thread.
1306 #ifndef DEFAULT_THREAD_NAME
1307 #define DEFAULT_THREAD_NAME "lwIP"
1311 * DEFAULT_THREAD_STACKSIZE: The stack size used by any other lwIP thread.
1312 * The stack size value itself is platform-dependent, but is passed to
1313 * sys_thread_new() when the thread is created.
1315 #ifndef DEFAULT_THREAD_STACKSIZE
1316 #define DEFAULT_THREAD_STACKSIZE 0
1320 * DEFAULT_THREAD_PRIO: The priority assigned to any other lwIP thread.
1321 * The priority value itself is platform-dependent, but is passed to
1322 * sys_thread_new() when the thread is created.
1324 #ifndef DEFAULT_THREAD_PRIO
1325 #define DEFAULT_THREAD_PRIO 1
1329 * DEFAULT_RAW_RECVMBOX_SIZE: The mailbox size for the incoming packets on a
1330 * NETCONN_RAW. The queue size value itself is platform-dependent, but is passed
1331 * to sys_mbox_new() when the recvmbox is created.
1333 #ifndef DEFAULT_RAW_RECVMBOX_SIZE
1334 #define DEFAULT_RAW_RECVMBOX_SIZE 0
1338 * DEFAULT_UDP_RECVMBOX_SIZE: The mailbox size for the incoming packets on a
1339 * NETCONN_UDP. The queue size value itself is platform-dependent, but is passed
1340 * to sys_mbox_new() when the recvmbox is created.
1342 #ifndef DEFAULT_UDP_RECVMBOX_SIZE
1343 #define DEFAULT_UDP_RECVMBOX_SIZE 0
1347 * DEFAULT_TCP_RECVMBOX_SIZE: The mailbox size for the incoming packets on a
1348 * NETCONN_TCP. The queue size value itself is platform-dependent, but is passed
1349 * to sys_mbox_new() when the recvmbox is created.
1351 #ifndef DEFAULT_TCP_RECVMBOX_SIZE
1352 #define DEFAULT_TCP_RECVMBOX_SIZE 0
1356 * DEFAULT_ACCEPTMBOX_SIZE: The mailbox size for the incoming connections.
1357 * The queue size value itself is platform-dependent, but is passed to
1358 * sys_mbox_new() when the acceptmbox is created.
1360 #ifndef DEFAULT_ACCEPTMBOX_SIZE
1361 #define DEFAULT_ACCEPTMBOX_SIZE 0
1365 ----------------------------------------------
1366 ---------- Sequential layer options ----------
1367 ----------------------------------------------
1370 * LWIP_TCPIP_CORE_LOCKING: (EXPERIMENTAL!)
1371 * Don't use it if you're not an active lwIP project member
1373 #ifndef LWIP_TCPIP_CORE_LOCKING
1374 #define LWIP_TCPIP_CORE_LOCKING 0
1378 * LWIP_TCPIP_CORE_LOCKING_INPUT: (EXPERIMENTAL!)
1379 * Don't use it if you're not an active lwIP project member
1381 #ifndef LWIP_TCPIP_CORE_LOCKING_INPUT
1382 #define LWIP_TCPIP_CORE_LOCKING_INPUT 0
1386 * LWIP_NETCONN==1: Enable Netconn API (require to use api_lib.c)
1388 #ifndef LWIP_NETCONN
1389 #define LWIP_NETCONN 1
1392 /** LWIP_TCPIP_TIMEOUT==1: Enable tcpip_timeout/tcpip_untimeout tod create
1393 * timers running in tcpip_thread from another thread.
1395 #ifndef LWIP_TCPIP_TIMEOUT
1396 #define LWIP_TCPIP_TIMEOUT 1
1400 ------------------------------------
1401 ---------- Socket options ----------
1402 ------------------------------------
1405 * LWIP_SOCKET==1: Enable Socket API (require to use sockets.c)
1408 #define LWIP_SOCKET 1
1412 * LWIP_COMPAT_SOCKETS==1: Enable BSD-style sockets functions names.
1413 * (only used if you use sockets.c)
1415 #ifndef LWIP_COMPAT_SOCKETS
1416 #define LWIP_COMPAT_SOCKETS 1
1420 * LWIP_POSIX_SOCKETS_IO_NAMES==1: Enable POSIX-style sockets functions names.
1421 * Disable this option if you use a POSIX operating system that uses the same
1422 * names (read, write & close). (only used if you use sockets.c)
1424 #ifndef LWIP_POSIX_SOCKETS_IO_NAMES
1425 #define LWIP_POSIX_SOCKETS_IO_NAMES 1
1429 * LWIP_TCP_KEEPALIVE==1: Enable TCP_KEEPIDLE, TCP_KEEPINTVL and TCP_KEEPCNT
1430 * options processing. Note that TCP_KEEPIDLE and TCP_KEEPINTVL have to be set
1431 * in seconds. (does not require sockets.c, and will affect tcp.c)
1433 #ifndef LWIP_TCP_KEEPALIVE
1434 #define LWIP_TCP_KEEPALIVE 0
1438 * LWIP_SO_RCVTIMEO==1: Enable receive timeout for sockets/netconns and
1439 * SO_RCVTIMEO processing.
1441 #ifndef LWIP_SO_RCVTIMEO
1442 #define LWIP_SO_RCVTIMEO 0
1446 * LWIP_SO_RCVBUF==1: Enable SO_RCVBUF processing.
1448 #ifndef LWIP_SO_RCVBUF
1449 #define LWIP_SO_RCVBUF 0
1453 * If LWIP_SO_RCVBUF is used, this is the default value for recv_bufsize.
1455 #ifndef RECV_BUFSIZE_DEFAULT
1456 #define RECV_BUFSIZE_DEFAULT INT_MAX
1460 * SO_REUSE==1: Enable SO_REUSEADDR option.
1467 * SO_REUSE_RXTOALL==1: Pass a copy of incoming broadcast/multicast packets
1468 * to all local matches if SO_REUSEADDR is turned on.
1469 * WARNING: Adds a memcpy for every packet if passing to more than one pcb!
1471 #ifndef SO_REUSE_RXTOALL
1472 #define SO_REUSE_RXTOALL 0
1476 * LWIP_FIONREAD_LINUXMODE==0 (default): ioctl/FIONREAD returns the amount of
1477 * pending data in the network buffer. This is the way windows does it. It's
1478 * the default for lwIP since it is smaller.
1479 * LWIP_FIONREAD_LINUXMODE==1: ioctl/FIONREAD returns the size of the next
1480 * pending datagram in bytes. This is the way linux does it. This code is only
1481 * here for compatibility.
1483 #ifndef LWIP_FIONREAD_LINUXMODE
1484 #define LWIP_FIONREAD_LINUXMODE 0
1488 ----------------------------------------
1489 ---------- Statistics options ----------
1490 ----------------------------------------
1493 * LWIP_STATS==1: Enable statistics collection in lwip_stats.
1496 #define LWIP_STATS 1
1502 * LWIP_STATS_DISPLAY==1: Compile in the statistics output functions.
1504 #ifndef LWIP_STATS_DISPLAY
1505 #define LWIP_STATS_DISPLAY 0
1509 * LINK_STATS==1: Enable link stats.
1512 #define LINK_STATS 1
1516 * ETHARP_STATS==1: Enable etharp stats.
1518 #ifndef ETHARP_STATS
1519 #define ETHARP_STATS (LWIP_ARP)
1523 * IP_STATS==1: Enable IP stats.
1530 * IPFRAG_STATS==1: Enable IP fragmentation stats. Default is
1531 * on if using either frag or reass.
1533 #ifndef IPFRAG_STATS
1534 #define IPFRAG_STATS (IP_REASSEMBLY || IP_FRAG)
1538 * ICMP_STATS==1: Enable ICMP stats.
1541 #define ICMP_STATS 1
1545 * IGMP_STATS==1: Enable IGMP stats.
1548 #define IGMP_STATS (LWIP_IGMP)
1552 * UDP_STATS==1: Enable UDP stats. Default is on if
1553 * UDP enabled, otherwise off.
1556 #define UDP_STATS (LWIP_UDP)
1560 * TCP_STATS==1: Enable TCP stats. Default is on if TCP
1561 * enabled, otherwise off.
1564 #define TCP_STATS (LWIP_TCP)
1568 * MEM_STATS==1: Enable mem.c stats.
1571 #define MEM_STATS ((MEM_LIBC_MALLOC == 0) && (MEM_USE_POOLS == 0))
1575 * MEMP_STATS==1: Enable memp.c pool stats.
1578 #define MEMP_STATS (MEMP_MEM_MALLOC == 0)
1582 * SYS_STATS==1: Enable system stats (sem and mbox counts, etc).
1585 #define SYS_STATS (NO_SYS == 0)
1589 * IP6_STATS==1: Enable IPv6 stats.
1592 #define IP6_STATS (LWIP_IPV6)
1596 * ICMP6_STATS==1: Enable ICMP for IPv6 stats.
1599 #define ICMP6_STATS (LWIP_IPV6 && LWIP_ICMP6)
1603 * IP6_FRAG_STATS==1: Enable IPv6 fragmentation stats.
1605 #ifndef IP6_FRAG_STATS
1606 #define IP6_FRAG_STATS (LWIP_IPV6 && (LWIP_IPV6_FRAG || LWIP_IPV6_REASS))
1610 * MLD6_STATS==1: Enable MLD for IPv6 stats.
1613 #define MLD6_STATS (LWIP_IPV6 && LWIP_IPV6_MLD)
1617 * ND6_STATS==1: Enable Neighbor discovery for IPv6 stats.
1620 #define ND6_STATS (LWIP_IPV6)
1625 #define LINK_STATS 0
1627 #define IPFRAG_STATS 0
1628 #define ICMP_STATS 0
1629 #define IGMP_STATS 0
1633 #define MEMP_STATS 0
1635 #define LWIP_STATS_DISPLAY 0
1637 #define ICMP6_STATS 0
1638 #define IP6_FRAG_STATS 0
1639 #define MLD6_STATS 0
1642 #endif /* LWIP_STATS */
1645 ---------------------------------
1646 ---------- PPP options ----------
1647 ---------------------------------
1650 * PPP_SUPPORT==1: Enable PPP.
1653 #define PPP_SUPPORT 0
1657 * PPPOE_SUPPORT==1: Enable PPP Over Ethernet
1659 #ifndef PPPOE_SUPPORT
1660 #define PPPOE_SUPPORT 0
1664 * PPPOS_SUPPORT==1: Enable PPP Over Serial
1666 #ifndef PPPOS_SUPPORT
1667 #define PPPOS_SUPPORT PPP_SUPPORT
1673 * NUM_PPP: Max PPP sessions.
1680 * PAP_SUPPORT==1: Support PAP.
1683 #define PAP_SUPPORT 0
1687 * CHAP_SUPPORT==1: Support CHAP.
1689 #ifndef CHAP_SUPPORT
1690 #define CHAP_SUPPORT 0
1694 * MSCHAP_SUPPORT==1: Support MSCHAP. CURRENTLY NOT SUPPORTED! DO NOT SET!
1696 #ifndef MSCHAP_SUPPORT
1697 #define MSCHAP_SUPPORT 0
1701 * CBCP_SUPPORT==1: Support CBCP. CURRENTLY NOT SUPPORTED! DO NOT SET!
1703 #ifndef CBCP_SUPPORT
1704 #define CBCP_SUPPORT 0
1708 * CCP_SUPPORT==1: Support CCP. CURRENTLY NOT SUPPORTED! DO NOT SET!
1711 #define CCP_SUPPORT 0
1715 * VJ_SUPPORT==1: Support VJ header compression.
1718 #define VJ_SUPPORT 0
1722 * MD5_SUPPORT==1: Support MD5 (see also CHAP).
1725 #define MD5_SUPPORT 0
1731 #ifndef FSM_DEFTIMEOUT
1732 #define FSM_DEFTIMEOUT 6 /* Timeout time in seconds */
1735 #ifndef FSM_DEFMAXTERMREQS
1736 #define FSM_DEFMAXTERMREQS 2 /* Maximum Terminate-Request transmissions */
1739 #ifndef FSM_DEFMAXCONFREQS
1740 #define FSM_DEFMAXCONFREQS 10 /* Maximum Configure-Request transmissions */
1743 #ifndef FSM_DEFMAXNAKLOOPS
1744 #define FSM_DEFMAXNAKLOOPS 5 /* Maximum number of nak loops */
1747 #ifndef UPAP_DEFTIMEOUT
1748 #define UPAP_DEFTIMEOUT 6 /* Timeout (seconds) for retransmitting req */
1751 #ifndef UPAP_DEFREQTIME
1752 #define UPAP_DEFREQTIME 30 /* Time to wait for auth-req from peer */
1755 #ifndef CHAP_DEFTIMEOUT
1756 #define CHAP_DEFTIMEOUT 6 /* Timeout time in seconds */
1759 #ifndef CHAP_DEFTRANSMITS
1760 #define CHAP_DEFTRANSMITS 10 /* max # times to send challenge */
1763 /* Interval in seconds between keepalive echo requests, 0 to disable. */
1764 #ifndef LCP_ECHOINTERVAL
1765 #define LCP_ECHOINTERVAL 0
1768 /* Number of unanswered echo requests before failure. */
1769 #ifndef LCP_MAXECHOFAILS
1770 #define LCP_MAXECHOFAILS 3
1773 /* Max Xmit idle time (in jiffies) before resend flag char. */
1774 #ifndef PPP_MAXIDLEFLAG
1775 #define PPP_MAXIDLEFLAG 100
1781 * Note - lcp shouldn't be allowed to negotiate stuff outside these
1782 * limits. See lcp.h in the pppd directory.
1783 * (XXX - these constants should simply be shared by lcp.c instead
1784 * of living in lcp.h)
1786 #define PPP_MTU 1500 /* Default MTU (size of Info field) */
1788 /* #define PPP_MAXMTU 65535 - (PPP_HDRLEN + PPP_FCSLEN) */
1789 #define PPP_MAXMTU 1500 /* Largest MTU we allow */
1791 #define PPP_MINMTU 64
1792 #define PPP_MRU 1500 /* default MRU = max length of info field */
1793 #define PPP_MAXMRU 1500 /* Largest MRU we allow */
1795 #define PPP_DEFMRU 296 /* Try for this */
1797 #define PPP_MINMRU 128 /* No MRUs below this */
1800 #define MAXNAMELEN 256 /* max length of hostname or name for auth */
1802 #ifndef MAXSECRETLEN
1803 #define MAXSECRETLEN 256 /* max length of password or secret */
1806 #endif /* PPP_SUPPORT */
1809 --------------------------------------
1810 ---------- Checksum options ----------
1811 --------------------------------------
1814 * CHECKSUM_GEN_IP==1: Generate checksums in software for outgoing IP packets.
1816 #ifndef CHECKSUM_GEN_IP
1817 #define CHECKSUM_GEN_IP 1
1821 * CHECKSUM_GEN_UDP==1: Generate checksums in software for outgoing UDP packets.
1823 #ifndef CHECKSUM_GEN_UDP
1824 #define CHECKSUM_GEN_UDP 1
1828 * CHECKSUM_GEN_TCP==1: Generate checksums in software for outgoing TCP packets.
1830 #ifndef CHECKSUM_GEN_TCP
1831 #define CHECKSUM_GEN_TCP 1
1835 * CHECKSUM_CHECK_IP==1: Check checksums in software for incoming IP packets.
1837 #ifndef CHECKSUM_CHECK_IP
1838 #define CHECKSUM_CHECK_IP 1
1842 * CHECKSUM_CHECK_UDP==1: Check checksums in software for incoming UDP packets.
1844 #ifndef CHECKSUM_CHECK_UDP
1845 #define CHECKSUM_CHECK_UDP 1
1849 * CHECKSUM_CHECK_TCP==1: Check checksums in software for incoming TCP packets.
1851 #ifndef CHECKSUM_CHECK_TCP
1852 #define CHECKSUM_CHECK_TCP 1
1856 * LWIP_CHECKSUM_ON_COPY==1: Calculate checksum when copying data from
1857 * application buffers to pbufs.
1859 #ifndef LWIP_CHECKSUM_ON_COPY
1860 #define LWIP_CHECKSUM_ON_COPY 0
1864 ---------------------------------------
1865 ---------- IPv6 options ---------------
1866 ---------------------------------------
1869 * LWIP_IPV6==1: Enable IPv6
1876 * LWIP_IPV6_NUM_ADDRESSES: Number of IPv6 addresses per netif.
1878 #ifndef LWIP_IPV6_NUM_ADDRESSES
1879 #define LWIP_IPV6_NUM_ADDRESSES 3
1883 * LWIP_IPV6_FORWARD==1: Forward IPv6 packets across netifs
1885 #ifndef LWIP_IPV6_FORWARD
1886 #define LWIP_IPV6_FORWARD 0
1890 * LWIP_ICMP6==1: Enable ICMPv6 (mandatory per RFC)
1893 #define LWIP_ICMP6 (LWIP_IPV6)
1897 * LWIP_ICMP6_DATASIZE: bytes from original packet to send back in
1898 * ICMPv6 error messages.
1900 #ifndef LWIP_ICMP6_DATASIZE
1901 #define LWIP_ICMP6_DATASIZE 8
1905 * LWIP_ICMP6_HL: default hop limit for ICMPv6 messages
1907 #ifndef LWIP_ICMP6_HL
1908 #define LWIP_ICMP6_HL 255
1912 * LWIP_ICMP6_CHECKSUM_CHECK==1: verify checksum on ICMPv6 packets
1914 #ifndef LWIP_ICMP6_CHECKSUM_CHECK
1915 #define LWIP_ICMP6_CHECKSUM_CHECK 1
1919 * LWIP_IPV6_MLD==1: Enable multicast listener discovery protocol.
1921 #ifndef LWIP_IPV6_MLD
1922 #define LWIP_IPV6_MLD (LWIP_IPV6)
1926 * MEMP_NUM_MLD6_GROUP: Max number of IPv6 multicast that can be joined.
1928 #ifndef MEMP_NUM_MLD6_GROUP
1929 #define MEMP_NUM_MLD6_GROUP 4
1933 * LWIP_IPV6_FRAG==1: Fragment outgoing IPv6 packets that are too big.
1935 #ifndef LWIP_IPV6_FRAG
1936 #define LWIP_IPV6_FRAG 0
1940 * LWIP_IPV6_REASS==1: reassemble incoming IPv6 packets that fragmented
1942 #ifndef LWIP_IPV6_REASS
1943 #define LWIP_IPV6_REASS (LWIP_IPV6)
1947 * LWIP_ND6_QUEUEING==1: queue outgoing IPv6 packets while MAC address
1948 * is being resolved.
1950 #ifndef LWIP_ND6_QUEUEING
1951 #define LWIP_ND6_QUEUEING (LWIP_IPV6)
1955 * MEMP_NUM_ND6_QUEUE: Max number of IPv6 packets to queue during MAC resolution.
1957 #ifndef MEMP_NUM_ND6_QUEUE
1958 #define MEMP_NUM_ND6_QUEUE 20
1962 * LWIP_ND6_NUM_NEIGHBORS: Number of entries in IPv6 neighbor cache
1964 #ifndef LWIP_ND6_NUM_NEIGHBORS
1965 #define LWIP_ND6_NUM_NEIGHBORS 10
1969 * LWIP_ND6_NUM_DESTINATIONS: number of entries in IPv6 destination cache
1971 #ifndef LWIP_ND6_NUM_DESTINATIONS
1972 #define LWIP_ND6_NUM_DESTINATIONS 10
1976 * LWIP_ND6_NUM_PREFIXES: number of entries in IPv6 on-link prefixes cache
1978 #ifndef LWIP_ND6_NUM_PREFIXES
1979 #define LWIP_ND6_NUM_PREFIXES 5
1983 * LWIP_ND6_NUM_ROUTERS: number of entries in IPv6 default router cache
1985 #ifndef LWIP_ND6_NUM_ROUTERS
1986 #define LWIP_ND6_NUM_ROUTERS 3
1990 * LWIP_ND6_MAX_MULTICAST_SOLICIT: max number of multicast solicit messages to send
1991 * (neighbor solicit and router solicit)
1993 #ifndef LWIP_ND6_MAX_MULTICAST_SOLICIT
1994 #define LWIP_ND6_MAX_MULTICAST_SOLICIT 3
1998 * LWIP_ND6_MAX_UNICAST_SOLICIT: max number of unicast neighbor solicitation messages
1999 * to send during neighbor reachability detection.
2001 #ifndef LWIP_ND6_MAX_UNICAST_SOLICIT
2002 #define LWIP_ND6_MAX_UNICAST_SOLICIT 3
2006 * Unused: See ND RFC (time in milliseconds).
2008 #ifndef LWIP_ND6_MAX_ANYCAST_DELAY_TIME
2009 #define LWIP_ND6_MAX_ANYCAST_DELAY_TIME 1000
2013 * Unused: See ND RFC
2015 #ifndef LWIP_ND6_MAX_NEIGHBOR_ADVERTISEMENT
2016 #define LWIP_ND6_MAX_NEIGHBOR_ADVERTISEMENT 3
2020 * LWIP_ND6_REACHABLE_TIME: default neighbor reachable time (in milliseconds).
2021 * May be updated by router advertisement messages.
2023 #ifndef LWIP_ND6_REACHABLE_TIME
2024 #define LWIP_ND6_REACHABLE_TIME 30000
2028 * LWIP_ND6_RETRANS_TIMER: default retransmission timer for solicitation messages
2030 #ifndef LWIP_ND6_RETRANS_TIMER
2031 #define LWIP_ND6_RETRANS_TIMER 1000
2035 * LWIP_ND6_DELAY_FIRST_PROBE_TIME: Delay before first unicast neighbor solicitation
2036 * message is sent, during neighbor reachability detection.
2038 #ifndef LWIP_ND6_DELAY_FIRST_PROBE_TIME
2039 #define LWIP_ND6_DELAY_FIRST_PROBE_TIME 5000
2043 * LWIP_ND6_ALLOW_RA_UPDATES==1: Allow Router Advertisement messages to update
2044 * Reachable time and retransmission timers, and netif MTU.
2046 #ifndef LWIP_ND6_ALLOW_RA_UPDATES
2047 #define LWIP_ND6_ALLOW_RA_UPDATES 1
2051 * LWIP_IPV6_SEND_ROUTER_SOLICIT==1: Send router solicitation messages during
2054 #ifndef LWIP_IPV6_SEND_ROUTER_SOLICIT
2055 #define LWIP_IPV6_SEND_ROUTER_SOLICIT 1
2059 * LWIP_ND6_TCP_REACHABILITY_HINTS==1: Allow TCP to provide Neighbor Discovery
2060 * with reachability hints for connected destinations. This helps avoid sending
2061 * unicast neighbor solicitation messages.
2063 #ifndef LWIP_ND6_TCP_REACHABILITY_HINTS
2064 #define LWIP_ND6_TCP_REACHABILITY_HINTS 1
2068 * LWIP_IPV6_AUTOCONFIG==1: Enable stateless address autoconfiguration as per RFC 4862.
2070 #ifndef LWIP_IPV6_AUTOCONFIG
2071 #define LWIP_IPV6_AUTOCONFIG (LWIP_IPV6)
2075 * LWIP_IPV6_DUP_DETECT_ATTEMPTS: Number of duplicate address detection attempts.
2077 #ifndef LWIP_IPV6_DUP_DETECT_ATTEMPTS
2078 #define LWIP_IPV6_DUP_DETECT_ATTEMPTS 1
2082 * LWIP_IPV6_DHCP6==1: enable DHCPv6 stateful address autoconfiguration.
2084 #ifndef LWIP_IPV6_DHCP6
2085 #define LWIP_IPV6_DHCP6 0
2089 ---------------------------------------
2090 ---------- Hook options ---------------
2091 ---------------------------------------
2094 /* Hooks are undefined by default, define them to a function if you need them. */
2097 * LWIP_HOOK_IP4_INPUT(pbuf, input_netif):
2098 * - called from ip_input() (IPv4)
2099 * - pbuf: received struct pbuf passed to ip_input()
2100 * - input_netif: struct netif on which the packet has been received
2102 * - 0: Hook has not consumed the packet, packet is processed as normal
2103 * - != 0: Hook has consumed the packet.
2104 * If the hook consumed the packet, 'pbuf' is in the responsibility of the hook
2105 * (i.e. free it when done).
2109 * LWIP_HOOK_IP4_ROUTE(dest):
2110 * - called from ip_route() (IPv4)
2111 * - dest: destination IPv4 address
2112 * Returns the destination netif or NULL if no destination netif is found. In
2113 * that case, ip_route() continues as normal.
2117 ---------------------------------------
2118 ---------- Debugging options ----------
2119 ---------------------------------------
2122 * LWIP_DBG_MIN_LEVEL: After masking, the value of the debug is
2123 * compared against this value. If it is smaller, then debugging
2124 * messages are written.
2126 #ifndef LWIP_DBG_MIN_LEVEL
2127 #define LWIP_DBG_MIN_LEVEL LWIP_DBG_LEVEL_ALL
2131 * LWIP_DBG_TYPES_ON: A mask that can be used to globally enable/disable
2132 * debug messages of certain types.
2134 #ifndef LWIP_DBG_TYPES_ON
2135 #define LWIP_DBG_TYPES_ON LWIP_DBG_ON
2139 * ETHARP_DEBUG: Enable debugging in etharp.c.
2141 #ifndef ETHARP_DEBUG
2142 #define ETHARP_DEBUG LWIP_DBG_OFF
2146 * NETIF_DEBUG: Enable debugging in netif.c.
2149 #define NETIF_DEBUG LWIP_DBG_OFF
2153 * PBUF_DEBUG: Enable debugging in pbuf.c.
2156 #define PBUF_DEBUG LWIP_DBG_OFF
2160 * API_LIB_DEBUG: Enable debugging in api_lib.c.
2162 #ifndef API_LIB_DEBUG
2163 #define API_LIB_DEBUG LWIP_DBG_OFF
2167 * API_MSG_DEBUG: Enable debugging in api_msg.c.
2169 #ifndef API_MSG_DEBUG
2170 #define API_MSG_DEBUG LWIP_DBG_OFF
2174 * SOCKETS_DEBUG: Enable debugging in sockets.c.
2176 #ifndef SOCKETS_DEBUG
2177 #define SOCKETS_DEBUG LWIP_DBG_OFF
2181 * ICMP_DEBUG: Enable debugging in icmp.c.
2184 #define ICMP_DEBUG LWIP_DBG_OFF
2188 * IGMP_DEBUG: Enable debugging in igmp.c.
2191 #define IGMP_DEBUG LWIP_DBG_OFF
2195 * INET_DEBUG: Enable debugging in inet.c.
2198 #define INET_DEBUG LWIP_DBG_OFF
2202 * IP_DEBUG: Enable debugging for IP.
2205 #define IP_DEBUG LWIP_DBG_OFF
2209 * IP_REASS_DEBUG: Enable debugging in ip_frag.c for both frag & reass.
2211 #ifndef IP_REASS_DEBUG
2212 #define IP_REASS_DEBUG LWIP_DBG_OFF
2216 * RAW_DEBUG: Enable debugging in raw.c.
2219 #define RAW_DEBUG LWIP_DBG_OFF
2223 * MEM_DEBUG: Enable debugging in mem.c.
2226 #define MEM_DEBUG LWIP_DBG_OFF
2230 * MEMP_DEBUG: Enable debugging in memp.c.
2233 #define MEMP_DEBUG LWIP_DBG_OFF
2237 * SYS_DEBUG: Enable debugging in sys.c.
2240 #define SYS_DEBUG LWIP_DBG_OFF
2244 * TIMERS_DEBUG: Enable debugging in timers.c.
2246 #ifndef TIMERS_DEBUG
2247 #define TIMERS_DEBUG LWIP_DBG_OFF
2251 * TCP_DEBUG: Enable debugging for TCP.
2254 #define TCP_DEBUG LWIP_DBG_OFF
2258 * TCP_INPUT_DEBUG: Enable debugging in tcp_in.c for incoming debug.
2260 #ifndef TCP_INPUT_DEBUG
2261 #define TCP_INPUT_DEBUG LWIP_DBG_OFF
2265 * TCP_FR_DEBUG: Enable debugging in tcp_in.c for fast retransmit.
2267 #ifndef TCP_FR_DEBUG
2268 #define TCP_FR_DEBUG LWIP_DBG_OFF
2272 * TCP_RTO_DEBUG: Enable debugging in TCP for retransmit
2275 #ifndef TCP_RTO_DEBUG
2276 #define TCP_RTO_DEBUG LWIP_DBG_OFF
2280 * TCP_CWND_DEBUG: Enable debugging for TCP congestion window.
2282 #ifndef TCP_CWND_DEBUG
2283 #define TCP_CWND_DEBUG LWIP_DBG_OFF
2287 * TCP_WND_DEBUG: Enable debugging in tcp_in.c for window updating.
2289 #ifndef TCP_WND_DEBUG
2290 #define TCP_WND_DEBUG LWIP_DBG_OFF
2294 * TCP_OUTPUT_DEBUG: Enable debugging in tcp_out.c output functions.
2296 #ifndef TCP_OUTPUT_DEBUG
2297 #define TCP_OUTPUT_DEBUG LWIP_DBG_OFF
2301 * TCP_RST_DEBUG: Enable debugging for TCP with the RST message.
2303 #ifndef TCP_RST_DEBUG
2304 #define TCP_RST_DEBUG LWIP_DBG_OFF
2308 * TCP_QLEN_DEBUG: Enable debugging for TCP queue lengths.
2310 #ifndef TCP_QLEN_DEBUG
2311 #define TCP_QLEN_DEBUG LWIP_DBG_OFF
2315 * UDP_DEBUG: Enable debugging in UDP.
2318 #define UDP_DEBUG LWIP_DBG_OFF
2322 * TCPIP_DEBUG: Enable debugging in tcpip.c.
2325 #define TCPIP_DEBUG LWIP_DBG_OFF
2329 * PPP_DEBUG: Enable debugging for PPP.
2332 #define PPP_DEBUG LWIP_DBG_OFF
2336 * SLIP_DEBUG: Enable debugging in slipif.c.
2339 #define SLIP_DEBUG LWIP_DBG_OFF
2343 * DHCP_DEBUG: Enable debugging in dhcp.c.
2346 #define DHCP_DEBUG LWIP_DBG_OFF
2350 * AUTOIP_DEBUG: Enable debugging in autoip.c.
2352 #ifndef AUTOIP_DEBUG
2353 #define AUTOIP_DEBUG LWIP_DBG_OFF
2357 * SNMP_MSG_DEBUG: Enable debugging for SNMP messages.
2359 #ifndef SNMP_MSG_DEBUG
2360 #define SNMP_MSG_DEBUG LWIP_DBG_OFF
2364 * SNMP_MIB_DEBUG: Enable debugging for SNMP MIBs.
2366 #ifndef SNMP_MIB_DEBUG
2367 #define SNMP_MIB_DEBUG LWIP_DBG_OFF
2371 * DNS_DEBUG: Enable debugging for DNS.
2374 #define DNS_DEBUG LWIP_DBG_OFF
2378 * IP6_DEBUG: Enable debugging for IPv6.
2381 #define IP6_DEBUG LWIP_DBG_OFF
2384 #endif /* __LWIP_OPT_H__ */