src/core/init.c - third_party/github/STMicroelectronics/stm32_mw_lwip - Git at Google

 /**
  * @file
  * Modules initialization
  *
  */

 /*
  * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without modification,
  * are permitted provided that the following conditions are met:
  *
  * 1. Redistributions of source code must retain the above copyright notice,
  *    this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright notice,
  *    this list of conditions and the following disclaimer in the documentation
  *    and/or other materials provided with the distribution.
  * 3. The name of the author may not be used to endorse or promote products
  *    derived from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
  * OF SUCH DAMAGE.
  *
  * This file is part of the lwIP TCP/IP stack.
  *
  * Author: Adam Dunkels <adam@sics.se>
  */

 #include "lwip/opt.h"

 #include "lwip/init.h"
 #include "lwip/stats.h"
 #include "lwip/sys.h"
 #include "lwip/mem.h"
 #include "lwip/memp.h"
 #include "lwip/pbuf.h"
 #include "lwip/netif.h"
 #include "lwip/sockets.h"
 #include "lwip/ip.h"
 #include "lwip/raw.h"
 #include "lwip/udp.h"
 #include "lwip/priv/tcp_priv.h"
 #include "lwip/igmp.h"
 #include "lwip/dns.h"
 #include "lwip/timeouts.h"
 #include "lwip/etharp.h"
 #include "lwip/ip6.h"
 #include "lwip/nd6.h"
 #include "lwip/mld6.h"
 #include "lwip/api.h"

 #include "netif/ppp/ppp_opts.h"
 #include "netif/ppp/ppp_impl.h"

 #ifndef LWIP_SKIP_PACKING_CHECK

 #ifdef PACK_STRUCT_USE_INCLUDES
 #  include "arch/bpstruct.h"
 #endif
 PACK_STRUCT_BEGIN
 struct packed_struct_test {
   PACK_STRUCT_FLD_8(u8_t  dummy1);
   PACK_STRUCT_FIELD(u32_t dummy2);
 } PACK_STRUCT_STRUCT;
 PACK_STRUCT_END
 #ifdef PACK_STRUCT_USE_INCLUDES
 #  include "arch/epstruct.h"
 #endif
 #define PACKED_STRUCT_TEST_EXPECTED_SIZE 5

 #endif

 /* Compile-time sanity checks for configuration errors.
  * These can be done independently of LWIP_DEBUG, without penalty.
  */
 #ifndef BYTE_ORDER
 #error "BYTE_ORDER is not defined, you have to define it in your cc.h"
 #endif
 #if (!IP_SOF_BROADCAST && IP_SOF_BROADCAST_RECV)
 #error "If you want to use broadcast filter per pcb on recv operations, you have to define IP_SOF_BROADCAST=1 in your lwipopts.h"
 #endif
 #if (!LWIP_UDP && LWIP_UDPLITE)
 #error "If you want to use UDP Lite, you have to define LWIP_UDP=1 in your lwipopts.h"
 #endif
 #if (!LWIP_UDP && LWIP_DHCP)
 #error "If you want to use DHCP, you have to define LWIP_UDP=1 in your lwipopts.h"
 #endif
 #if (!LWIP_UDP && !LWIP_RAW && LWIP_MULTICAST_TX_OPTIONS)
 #error "If you want to use LWIP_MULTICAST_TX_OPTIONS, you have to define LWIP_UDP=1 and/or LWIP_RAW=1 in your lwipopts.h"
 #endif
 #if (!LWIP_UDP && LWIP_DNS)
 #error "If you want to use DNS, you have to define LWIP_UDP=1 in your lwipopts.h"
 #endif
 #if !MEMP_MEM_MALLOC /* MEMP_NUM_* checks are disabled when not using the pool allocator */
 #if (LWIP_ARP && ARP_QUEUEING && (MEMP_NUM_ARP_QUEUE<=0))
 #error "If you want to use ARP Queueing, you have to define MEMP_NUM_ARP_QUEUE>=1 in your lwipopts.h"
 #endif
 #if (LWIP_RAW && (MEMP_NUM_RAW_PCB<=0))
 #error "If you want to use RAW, you have to define MEMP_NUM_RAW_PCB>=1 in your lwipopts.h"
 #endif
 #if (LWIP_UDP && (MEMP_NUM_UDP_PCB<=0))
 #error "If you want to use UDP, you have to define MEMP_NUM_UDP_PCB>=1 in your lwipopts.h"
 #endif
 #if (LWIP_TCP && (MEMP_NUM_TCP_PCB<=0))
 #error "If you want to use TCP, you have to define MEMP_NUM_TCP_PCB>=1 in your lwipopts.h"
 #endif
 #if (LWIP_IGMP && (MEMP_NUM_IGMP_GROUP<=1))
 #error "If you want to use IGMP, you have to define MEMP_NUM_IGMP_GROUP>1 in your lwipopts.h"
 #endif
 #if (LWIP_IGMP && !LWIP_MULTICAST_TX_OPTIONS)
 #error "If you want to use IGMP, you have to define LWIP_MULTICAST_TX_OPTIONS==1 in your lwipopts.h"
 #endif
 #if (LWIP_IGMP && !LWIP_IPV4)
 #error "IGMP needs LWIP_IPV4 enabled in your lwipopts.h"
 #endif
 #if ((LWIP_NETCONN || LWIP_SOCKET) && (MEMP_NUM_TCPIP_MSG_API<=0))
 #error "If you want to use Sequential API, you have to define MEMP_NUM_TCPIP_MSG_API>=1 in your lwipopts.h"
 #endif
 /* There must be sufficient timeouts, taking into account requirements of the subsystems. */
 #if LWIP_TIMERS && (MEMP_NUM_SYS_TIMEOUT < LWIP_NUM_SYS_TIMEOUT_INTERNAL)
 #error "MEMP_NUM_SYS_TIMEOUT is too low to accomodate all required timeouts"
 #endif
 #if (IP_REASSEMBLY && (MEMP_NUM_REASSDATA > IP_REASS_MAX_PBUFS))
 #error "MEMP_NUM_REASSDATA > IP_REASS_MAX_PBUFS doesn't make sense since each struct ip_reassdata must hold 2 pbufs at least!"
 #endif
 #endif /* !MEMP_MEM_MALLOC */
 #if LWIP_WND_SCALE
 #if (LWIP_TCP && (TCP_WND > 0xffffffff))
 #error "If you want to use TCP, TCP_WND must fit in an u32_t, so, you have to reduce it in your lwipopts.h"
 #endif
 #if (LWIP_TCP && (TCP_RCV_SCALE > 14))
 #error "The maximum valid window scale value is 14!"
 #endif
 #if (LWIP_TCP && (TCP_WND > (0xFFFFU << TCP_RCV_SCALE)))
 #error "TCP_WND is bigger than the configured LWIP_WND_SCALE allows!"
 #endif
 #if (LWIP_TCP && ((TCP_WND >> TCP_RCV_SCALE) == 0))
 #error "TCP_WND is too small for the configured LWIP_WND_SCALE (results in zero window)!"
 #endif
 #else /* LWIP_WND_SCALE */
 #if (LWIP_TCP && (TCP_WND > 0xffff))
 #error "If you want to use TCP, TCP_WND must fit in an u16_t, so, you have to reduce it in your lwipopts.h (or enable window scaling)"
 #endif
 #endif /* LWIP_WND_SCALE */
 #if (LWIP_TCP && (TCP_SND_QUEUELEN > 0xffff))
 #error "If you want to use TCP, TCP_SND_QUEUELEN must fit in an u16_t, so, you have to reduce it in your lwipopts.h"
 #endif
 #if (LWIP_TCP && (TCP_SND_QUEUELEN < 2))
 #error "TCP_SND_QUEUELEN must be at least 2 for no-copy TCP writes to work"
 #endif
 #if (LWIP_TCP && ((TCP_MAXRTX > 12) || (TCP_SYNMAXRTX > 12)))
 #error "If you want to use TCP, TCP_MAXRTX and TCP_SYNMAXRTX must less or equal to 12 (due to tcp_backoff table), so, you have to reduce them in your lwipopts.h"
 #endif
 #if (LWIP_TCP && TCP_LISTEN_BACKLOG && ((TCP_DEFAULT_LISTEN_BACKLOG < 0) || (TCP_DEFAULT_LISTEN_BACKLOG > 0xff)))
 #error "If you want to use TCP backlog, TCP_DEFAULT_LISTEN_BACKLOG must fit into an u8_t"
 #endif
 #if (LWIP_TCP && LWIP_TCP_SACK_OUT && !TCP_QUEUE_OOSEQ)
 #error "To use LWIP_TCP_SACK_OUT, TCP_QUEUE_OOSEQ needs to be enabled"
 #endif
 #if (LWIP_TCP && LWIP_TCP_SACK_OUT && (LWIP_TCP_MAX_SACK_NUM < 1))
 #error "LWIP_TCP_MAX_SACK_NUM must be greater than 0"
 #endif
 #if (LWIP_NETIF_API && (NO_SYS==1))
 #error "If you want to use NETIF API, you have to define NO_SYS=0 in your lwipopts.h"
 #endif
 #if ((LWIP_SOCKET || LWIP_NETCONN) && (NO_SYS==1))
 #error "If you want to use Sequential API, you have to define NO_SYS=0 in your lwipopts.h"
 #endif
 #if (LWIP_PPP_API && (NO_SYS==1))
 #error "If you want to use PPP API, you have to define NO_SYS=0 in your lwipopts.h"
 #endif
 #if (LWIP_PPP_API && (PPP_SUPPORT==0))
 #error "If you want to use PPP API, you have to enable PPP_SUPPORT in your lwipopts.h"
 #endif
 #if (((!LWIP_DHCP) || (!LWIP_AUTOIP)) && LWIP_DHCP_AUTOIP_COOP)
 #error "If you want to use DHCP/AUTOIP cooperation mode, you have to define LWIP_DHCP=1 and LWIP_AUTOIP=1 in your lwipopts.h"
 #endif
 #if (((!LWIP_DHCP) || (!LWIP_ARP)) && DHCP_DOES_ARP_CHECK)
 #error "If you want to use DHCP ARP checking, you have to define LWIP_DHCP=1 and LWIP_ARP=1 in your lwipopts.h"
 #endif
 #if (!LWIP_ARP && LWIP_AUTOIP)
 #error "If you want to use AUTOIP, you have to define LWIP_ARP=1 in your lwipopts.h"
 #endif
 #if (LWIP_TCP && ((LWIP_EVENT_API && LWIP_CALLBACK_API) || (!LWIP_EVENT_API && !LWIP_CALLBACK_API)))
 #error "One and exactly one of LWIP_EVENT_API and LWIP_CALLBACK_API has to be enabled in your lwipopts.h"
 #endif
 #if (LWIP_ALTCP && LWIP_EVENT_API)
 #error "The application layered tcp API does not work with LWIP_EVENT_API"
 #endif
 #if (MEM_LIBC_MALLOC && MEM_USE_POOLS)
 #error "MEM_LIBC_MALLOC and MEM_USE_POOLS may not both be simultaneously enabled in your lwipopts.h"
 #endif
 #if (MEM_USE_POOLS && !MEMP_USE_CUSTOM_POOLS)
 #error "MEM_USE_POOLS requires custom pools (MEMP_USE_CUSTOM_POOLS) to be enabled in your lwipopts.h"
 #endif
 #if (PBUF_POOL_BUFSIZE <= MEM_ALIGNMENT)
 #error "PBUF_POOL_BUFSIZE must be greater than MEM_ALIGNMENT or the offset may take the full first pbuf"
 #endif
 #if (DNS_LOCAL_HOSTLIST && !DNS_LOCAL_HOSTLIST_IS_DYNAMIC && !(defined(DNS_LOCAL_HOSTLIST_INIT)))
 #error "you have to define define DNS_LOCAL_HOSTLIST_INIT {{'host1', 0x123}, {'host2', 0x234}} to initialize DNS_LOCAL_HOSTLIST"
 #endif
 #if PPP_SUPPORT && !PPPOS_SUPPORT && !PPPOE_SUPPORT && !PPPOL2TP_SUPPORT
 #error "PPP_SUPPORT needs at least one of PPPOS_SUPPORT, PPPOE_SUPPORT or PPPOL2TP_SUPPORT turned on"
 #endif
 #if PPP_SUPPORT && !PPP_IPV4_SUPPORT && !PPP_IPV6_SUPPORT
 #error "PPP_SUPPORT needs PPP_IPV4_SUPPORT and/or PPP_IPV6_SUPPORT turned on"
 #endif
 #if PPP_SUPPORT && PPP_IPV4_SUPPORT && !LWIP_IPV4
 #error "PPP_IPV4_SUPPORT needs LWIP_IPV4 turned on"
 #endif
 #if PPP_SUPPORT && PPP_IPV6_SUPPORT && !LWIP_IPV6
 #error "PPP_IPV6_SUPPORT needs LWIP_IPV6 turned on"
 #endif
 #if !LWIP_ETHERNET && (LWIP_ARP || PPPOE_SUPPORT)
 #error "LWIP_ETHERNET needs to be turned on for LWIP_ARP or PPPOE_SUPPORT"
 #endif
 #if LWIP_TCPIP_CORE_LOCKING_INPUT && !LWIP_TCPIP_CORE_LOCKING
 #error "When using LWIP_TCPIP_CORE_LOCKING_INPUT, LWIP_TCPIP_CORE_LOCKING must be enabled, too"
 #endif
 #if LWIP_TCP && LWIP_NETIF_TX_SINGLE_PBUF && !TCP_OVERSIZE
 #error "LWIP_NETIF_TX_SINGLE_PBUF needs TCP_OVERSIZE enabled to create single-pbuf TCP packets"
 #endif
 #if LWIP_NETCONN && LWIP_TCP
 #if NETCONN_COPY != TCP_WRITE_FLAG_COPY
 #error "NETCONN_COPY != TCP_WRITE_FLAG_COPY"
 #endif
 #if NETCONN_MORE != TCP_WRITE_FLAG_MORE
 #error "NETCONN_MORE != TCP_WRITE_FLAG_MORE"
 #endif
 #endif /* LWIP_NETCONN && LWIP_TCP */
 #if LWIP_NETCONN_FULLDUPLEX && !LWIP_NETCONN_SEM_PER_THREAD
 #error "For LWIP_NETCONN_FULLDUPLEX to work, LWIP_NETCONN_SEM_PER_THREAD is required"
 #endif


 /* Compile-time checks for deprecated options.
  */
 #ifdef MEMP_NUM_TCPIP_MSG
 #error "MEMP_NUM_TCPIP_MSG option is deprecated. Remove it from your lwipopts.h."
 #endif
 #ifdef TCP_REXMIT_DEBUG
 #error "TCP_REXMIT_DEBUG option is deprecated. Remove it from your lwipopts.h."
 #endif
 #ifdef RAW_STATS
 #error "RAW_STATS option is deprecated. Remove it from your lwipopts.h."
 #endif
 #ifdef ETHARP_QUEUE_FIRST
 #error "ETHARP_QUEUE_FIRST option is deprecated. Remove it from your lwipopts.h."
 #endif
 #ifdef ETHARP_ALWAYS_INSERT
 #error "ETHARP_ALWAYS_INSERT option is deprecated. Remove it from your lwipopts.h."
 #endif
 #if !NO_SYS && LWIP_TCPIP_CORE_LOCKING && LWIP_COMPAT_MUTEX && !defined(LWIP_COMPAT_MUTEX_ALLOWED)
 #error "LWIP_COMPAT_MUTEX cannot prevent priority inversion. It is recommended to implement priority-aware mutexes. (Define LWIP_COMPAT_MUTEX_ALLOWED to disable this error.)"
 #endif

 #ifndef LWIP_DISABLE_TCP_SANITY_CHECKS
 #define LWIP_DISABLE_TCP_SANITY_CHECKS  0
 #endif
 #ifndef LWIP_DISABLE_MEMP_SANITY_CHECKS
 #define LWIP_DISABLE_MEMP_SANITY_CHECKS 0
 #endif

 /* MEMP sanity checks */
 #if MEMP_MEM_MALLOC
 #if !LWIP_DISABLE_MEMP_SANITY_CHECKS
 #if LWIP_NETCONN || LWIP_SOCKET
 #if !MEMP_NUM_NETCONN && LWIP_SOCKET
 #error "lwip_sanity_check: WARNING: MEMP_NUM_NETCONN cannot be 0 when using sockets!"
 #endif
 #else /* MEMP_MEM_MALLOC */
 #if MEMP_NUM_NETCONN > (MEMP_NUM_TCP_PCB+MEMP_NUM_TCP_PCB_LISTEN+MEMP_NUM_UDP_PCB+MEMP_NUM_RAW_PCB)
 #error "lwip_sanity_check: WARNING: MEMP_NUM_NETCONN should be less than the sum of MEMP_NUM_{TCP,RAW,UDP}_PCB+MEMP_NUM_TCP_PCB_LISTEN. If you know what you are doing, define LWIP_DISABLE_MEMP_SANITY_CHECKS to 1 to disable this error."
 #endif
 #endif /* LWIP_NETCONN || LWIP_SOCKET */
 #endif /* !LWIP_DISABLE_MEMP_SANITY_CHECKS */
 #if MEM_USE_POOLS
 #error "MEMP_MEM_MALLOC and MEM_USE_POOLS cannot be enabled at the same time"
 #endif
 #ifdef LWIP_HOOK_MEMP_AVAILABLE
 #error "LWIP_HOOK_MEMP_AVAILABLE doesn't make sense with MEMP_MEM_MALLOC"
 #endif
 #endif /* MEMP_MEM_MALLOC */

 /* TCP sanity checks */
 #if !LWIP_DISABLE_TCP_SANITY_CHECKS
 #if LWIP_TCP
 #if !MEMP_MEM_MALLOC && (MEMP_NUM_TCP_SEG < TCP_SND_QUEUELEN)
 #error "lwip_sanity_check: WARNING: MEMP_NUM_TCP_SEG should be at least as big as TCP_SND_QUEUELEN. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
 #endif
 #if TCP_SND_BUF < (2 * TCP_MSS)
 #error "lwip_sanity_check: WARNING: TCP_SND_BUF must be at least as much as (2 * TCP_MSS) for things to work smoothly. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
 #endif
 #if TCP_SND_QUEUELEN < (2 * (TCP_SND_BUF / TCP_MSS))
 #error "lwip_sanity_check: WARNING: TCP_SND_QUEUELEN must be at least as much as (2 * TCP_SND_BUF/TCP_MSS) for things to work. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
 #endif
 #if TCP_SNDLOWAT >= TCP_SND_BUF
 #error "lwip_sanity_check: WARNING: TCP_SNDLOWAT must be less than TCP_SND_BUF. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
 #endif
 #if TCP_SNDLOWAT >= (0xFFFF - (4 * TCP_MSS))
 #error "lwip_sanity_check: WARNING: TCP_SNDLOWAT must at least be 4*MSS below u16_t overflow!"
 #endif
 #if TCP_SNDQUEUELOWAT >= TCP_SND_QUEUELEN
 #error "lwip_sanity_check: WARNING: TCP_SNDQUEUELOWAT must be less than TCP_SND_QUEUELEN. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
 #endif
 #if !MEMP_MEM_MALLOC && PBUF_POOL_SIZE && (PBUF_POOL_BUFSIZE <= (PBUF_LINK_ENCAPSULATION_HLEN + PBUF_LINK_HLEN + PBUF_IP_HLEN + PBUF_TRANSPORT_HLEN))
 #error "lwip_sanity_check: WARNING: PBUF_POOL_BUFSIZE does not provide enough space for protocol headers. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
 #endif
 #if !MEMP_MEM_MALLOC && PBUF_POOL_SIZE && (TCP_WND > (PBUF_POOL_SIZE * (PBUF_POOL_BUFSIZE - (PBUF_LINK_ENCAPSULATION_HLEN + PBUF_LINK_HLEN + PBUF_IP_HLEN + PBUF_TRANSPORT_HLEN))))
 #error "lwip_sanity_check: WARNING: TCP_WND is larger than space provided by PBUF_POOL_SIZE * (PBUF_POOL_BUFSIZE - protocol headers). If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
 #endif
 #if TCP_WND < TCP_MSS
 #error "lwip_sanity_check: WARNING: TCP_WND is smaller than MSS. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
 #endif
 #endif /* LWIP_TCP */
 #endif /* !LWIP_DISABLE_TCP_SANITY_CHECKS */

 /**
  * @ingroup lwip_nosys
  * Initialize all modules.
  * Use this in NO_SYS mode. Use tcpip_init() otherwise.
  */
 void
 lwip_init(void)
 {
 #ifndef LWIP_SKIP_CONST_CHECK
   int a = 0;
   LWIP_UNUSED_ARG(a);
   LWIP_ASSERT("LWIP_CONST_CAST not implemented correctly. Check your lwIP port.", LWIP_CONST_CAST(void *, &a) == &a);
 #endif
 #ifndef LWIP_SKIP_PACKING_CHECK
   LWIP_ASSERT("Struct packing not implemented correctly. Check your lwIP port.", sizeof(struct packed_struct_test) == PACKED_STRUCT_TEST_EXPECTED_SIZE);
 #endif

   /* Modules initialization */
   stats_init();
 #if !NO_SYS
   sys_init();
 #endif /* !NO_SYS */
   mem_init();
   memp_init();
   pbuf_init();
   netif_init();
 #if LWIP_IPV4
   ip_init();
 #if LWIP_ARP
   etharp_init();
 #endif /* LWIP_ARP */
 #endif /* LWIP_IPV4 */
 #if LWIP_RAW
   raw_init();
 #endif /* LWIP_RAW */
 #if LWIP_UDP
   udp_init();
 #endif /* LWIP_UDP */
 #if LWIP_TCP
   tcp_init();
 #endif /* LWIP_TCP */
 #if LWIP_IGMP
   igmp_init();
 #endif /* LWIP_IGMP */
 #if LWIP_DNS
   dns_init();
 #endif /* LWIP_DNS */
 #if PPP_SUPPORT
   ppp_init();
 #endif

 #if LWIP_TIMERS
   sys_timeouts_init();
 #endif /* LWIP_TIMERS */
 }
	/**
	* @file
	* Modules initialization
	*
	*/

	/*
	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without modification,
	* are permitted provided that the following conditions are met:
	*
	* 1. Redistributions of source code must retain the above copyright notice,
	* this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright notice,
	* this list of conditions and the following disclaimer in the documentation
	* and/or other materials provided with the distribution.
	* 3. The name of the author may not be used to endorse or promote products
	* derived from this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
	* OF SUCH DAMAGE.
	*
	* This file is part of the lwIP TCP/IP stack.
	*
	* Author: Adam Dunkels <adam@sics.se>
	*/

	#include "lwip/opt.h"

	#include "lwip/init.h"
	#include "lwip/stats.h"
	#include "lwip/sys.h"
	#include "lwip/mem.h"
	#include "lwip/memp.h"
	#include "lwip/pbuf.h"
	#include "lwip/netif.h"
	#include "lwip/sockets.h"
	#include "lwip/ip.h"
	#include "lwip/raw.h"
	#include "lwip/udp.h"
	#include "lwip/priv/tcp_priv.h"
	#include "lwip/igmp.h"
	#include "lwip/dns.h"
	#include "lwip/timeouts.h"
	#include "lwip/etharp.h"
	#include "lwip/ip6.h"
	#include "lwip/nd6.h"
	#include "lwip/mld6.h"
	#include "lwip/api.h"

	#include "netif/ppp/ppp_opts.h"
	#include "netif/ppp/ppp_impl.h"

	#ifndef LWIP_SKIP_PACKING_CHECK

	#ifdef PACK_STRUCT_USE_INCLUDES
	# include "arch/bpstruct.h"
	#endif
	PACK_STRUCT_BEGIN
	struct packed_struct_test {
	PACK_STRUCT_FLD_8(u8_t dummy1);
	PACK_STRUCT_FIELD(u32_t dummy2);
	} PACK_STRUCT_STRUCT;
	PACK_STRUCT_END
	#ifdef PACK_STRUCT_USE_INCLUDES
	# include "arch/epstruct.h"
	#endif
	#define PACKED_STRUCT_TEST_EXPECTED_SIZE 5

	#endif

	/* Compile-time sanity checks for configuration errors.
	* These can be done independently of LWIP_DEBUG, without penalty.
	*/
	#ifndef BYTE_ORDER
	#error "BYTE_ORDER is not defined, you have to define it in your cc.h"
	#endif
	#if (!IP_SOF_BROADCAST && IP_SOF_BROADCAST_RECV)
	#error "If you want to use broadcast filter per pcb on recv operations, you have to define IP_SOF_BROADCAST=1 in your lwipopts.h"
	#endif
	#if (!LWIP_UDP && LWIP_UDPLITE)
	#error "If you want to use UDP Lite, you have to define LWIP_UDP=1 in your lwipopts.h"
	#endif
	#if (!LWIP_UDP && LWIP_DHCP)
	#error "If you want to use DHCP, you have to define LWIP_UDP=1 in your lwipopts.h"
	#endif
	#if (!LWIP_UDP && !LWIP_RAW && LWIP_MULTICAST_TX_OPTIONS)
	#error "If you want to use LWIP_MULTICAST_TX_OPTIONS, you have to define LWIP_UDP=1 and/or LWIP_RAW=1 in your lwipopts.h"
	#endif
	#if (!LWIP_UDP && LWIP_DNS)
	#error "If you want to use DNS, you have to define LWIP_UDP=1 in your lwipopts.h"
	#endif
	#if !MEMP_MEM_MALLOC /* MEMP_NUM_* checks are disabled when not using the pool allocator */
	#if (LWIP_ARP && ARP_QUEUEING && (MEMP_NUM_ARP_QUEUE<=0))
	#error "If you want to use ARP Queueing, you have to define MEMP_NUM_ARP_QUEUE>=1 in your lwipopts.h"
	#endif
	#if (LWIP_RAW && (MEMP_NUM_RAW_PCB<=0))
	#error "If you want to use RAW, you have to define MEMP_NUM_RAW_PCB>=1 in your lwipopts.h"
	#endif
	#if (LWIP_UDP && (MEMP_NUM_UDP_PCB<=0))
	#error "If you want to use UDP, you have to define MEMP_NUM_UDP_PCB>=1 in your lwipopts.h"
	#endif
	#if (LWIP_TCP && (MEMP_NUM_TCP_PCB<=0))
	#error "If you want to use TCP, you have to define MEMP_NUM_TCP_PCB>=1 in your lwipopts.h"
	#endif
	#if (LWIP_IGMP && (MEMP_NUM_IGMP_GROUP<=1))
	#error "If you want to use IGMP, you have to define MEMP_NUM_IGMP_GROUP>1 in your lwipopts.h"
	#endif
	#if (LWIP_IGMP && !LWIP_MULTICAST_TX_OPTIONS)
	#error "If you want to use IGMP, you have to define LWIP_MULTICAST_TX_OPTIONS==1 in your lwipopts.h"
	#endif
	#if (LWIP_IGMP && !LWIP_IPV4)
	#error "IGMP needs LWIP_IPV4 enabled in your lwipopts.h"
	#endif
	#if ((LWIP_NETCONN \|\| LWIP_SOCKET) && (MEMP_NUM_TCPIP_MSG_API<=0))
	#error "If you want to use Sequential API, you have to define MEMP_NUM_TCPIP_MSG_API>=1 in your lwipopts.h"
	#endif
	/* There must be sufficient timeouts, taking into account requirements of the subsystems. */
	#if LWIP_TIMERS && (MEMP_NUM_SYS_TIMEOUT < LWIP_NUM_SYS_TIMEOUT_INTERNAL)
	#error "MEMP_NUM_SYS_TIMEOUT is too low to accomodate all required timeouts"
	#endif
	#if (IP_REASSEMBLY && (MEMP_NUM_REASSDATA > IP_REASS_MAX_PBUFS))
	#error "MEMP_NUM_REASSDATA > IP_REASS_MAX_PBUFS doesn't make sense since each struct ip_reassdata must hold 2 pbufs at least!"
	#endif
	#endif /* !MEMP_MEM_MALLOC */
	#if LWIP_WND_SCALE
	#if (LWIP_TCP && (TCP_WND > 0xffffffff))
	#error "If you want to use TCP, TCP_WND must fit in an u32_t, so, you have to reduce it in your lwipopts.h"
	#endif
	#if (LWIP_TCP && (TCP_RCV_SCALE > 14))
	#error "The maximum valid window scale value is 14!"
	#endif
	#if (LWIP_TCP && (TCP_WND > (0xFFFFU << TCP_RCV_SCALE)))
	#error "TCP_WND is bigger than the configured LWIP_WND_SCALE allows!"
	#endif
	#if (LWIP_TCP && ((TCP_WND >> TCP_RCV_SCALE) == 0))
	#error "TCP_WND is too small for the configured LWIP_WND_SCALE (results in zero window)!"
	#endif
	#else /* LWIP_WND_SCALE */
	#if (LWIP_TCP && (TCP_WND > 0xffff))
	#error "If you want to use TCP, TCP_WND must fit in an u16_t, so, you have to reduce it in your lwipopts.h (or enable window scaling)"
	#endif
	#endif /* LWIP_WND_SCALE */
	#if (LWIP_TCP && (TCP_SND_QUEUELEN > 0xffff))
	#error "If you want to use TCP, TCP_SND_QUEUELEN must fit in an u16_t, so, you have to reduce it in your lwipopts.h"
	#endif
	#if (LWIP_TCP && (TCP_SND_QUEUELEN < 2))
	#error "TCP_SND_QUEUELEN must be at least 2 for no-copy TCP writes to work"
	#endif
	#if (LWIP_TCP && ((TCP_MAXRTX > 12) \|\| (TCP_SYNMAXRTX > 12)))
	#error "If you want to use TCP, TCP_MAXRTX and TCP_SYNMAXRTX must less or equal to 12 (due to tcp_backoff table), so, you have to reduce them in your lwipopts.h"
	#endif
	#if (LWIP_TCP && TCP_LISTEN_BACKLOG && ((TCP_DEFAULT_LISTEN_BACKLOG < 0) \|\| (TCP_DEFAULT_LISTEN_BACKLOG > 0xff)))
	#error "If you want to use TCP backlog, TCP_DEFAULT_LISTEN_BACKLOG must fit into an u8_t"
	#endif
	#if (LWIP_TCP && LWIP_TCP_SACK_OUT && !TCP_QUEUE_OOSEQ)
	#error "To use LWIP_TCP_SACK_OUT, TCP_QUEUE_OOSEQ needs to be enabled"
	#endif
	#if (LWIP_TCP && LWIP_TCP_SACK_OUT && (LWIP_TCP_MAX_SACK_NUM < 1))
	#error "LWIP_TCP_MAX_SACK_NUM must be greater than 0"
	#endif
	#if (LWIP_NETIF_API && (NO_SYS==1))
	#error "If you want to use NETIF API, you have to define NO_SYS=0 in your lwipopts.h"
	#endif
	#if ((LWIP_SOCKET \|\| LWIP_NETCONN) && (NO_SYS==1))
	#error "If you want to use Sequential API, you have to define NO_SYS=0 in your lwipopts.h"
	#endif
	#if (LWIP_PPP_API && (NO_SYS==1))
	#error "If you want to use PPP API, you have to define NO_SYS=0 in your lwipopts.h"
	#endif
	#if (LWIP_PPP_API && (PPP_SUPPORT==0))
	#error "If you want to use PPP API, you have to enable PPP_SUPPORT in your lwipopts.h"
	#endif
	#if (((!LWIP_DHCP) \|\| (!LWIP_AUTOIP)) && LWIP_DHCP_AUTOIP_COOP)
	#error "If you want to use DHCP/AUTOIP cooperation mode, you have to define LWIP_DHCP=1 and LWIP_AUTOIP=1 in your lwipopts.h"
	#endif
	#if (((!LWIP_DHCP) \|\| (!LWIP_ARP)) && DHCP_DOES_ARP_CHECK)
	#error "If you want to use DHCP ARP checking, you have to define LWIP_DHCP=1 and LWIP_ARP=1 in your lwipopts.h"
	#endif
	#if (!LWIP_ARP && LWIP_AUTOIP)
	#error "If you want to use AUTOIP, you have to define LWIP_ARP=1 in your lwipopts.h"
	#endif
	#if (LWIP_TCP && ((LWIP_EVENT_API && LWIP_CALLBACK_API) \|\| (!LWIP_EVENT_API && !LWIP_CALLBACK_API)))
	#error "One and exactly one of LWIP_EVENT_API and LWIP_CALLBACK_API has to be enabled in your lwipopts.h"
	#endif
	#if (LWIP_ALTCP && LWIP_EVENT_API)
	#error "The application layered tcp API does not work with LWIP_EVENT_API"
	#endif
	#if (MEM_LIBC_MALLOC && MEM_USE_POOLS)
	#error "MEM_LIBC_MALLOC and MEM_USE_POOLS may not both be simultaneously enabled in your lwipopts.h"
	#endif
	#if (MEM_USE_POOLS && !MEMP_USE_CUSTOM_POOLS)
	#error "MEM_USE_POOLS requires custom pools (MEMP_USE_CUSTOM_POOLS) to be enabled in your lwipopts.h"
	#endif
	#if (PBUF_POOL_BUFSIZE <= MEM_ALIGNMENT)
	#error "PBUF_POOL_BUFSIZE must be greater than MEM_ALIGNMENT or the offset may take the full first pbuf"
	#endif
	#if (DNS_LOCAL_HOSTLIST && !DNS_LOCAL_HOSTLIST_IS_DYNAMIC && !(defined(DNS_LOCAL_HOSTLIST_INIT)))
	#error "you have to define define DNS_LOCAL_HOSTLIST_INIT {{'host1', 0x123}, {'host2', 0x234}} to initialize DNS_LOCAL_HOSTLIST"
	#endif
	#if PPP_SUPPORT && !PPPOS_SUPPORT && !PPPOE_SUPPORT && !PPPOL2TP_SUPPORT
	#error "PPP_SUPPORT needs at least one of PPPOS_SUPPORT, PPPOE_SUPPORT or PPPOL2TP_SUPPORT turned on"
	#endif
	#if PPP_SUPPORT && !PPP_IPV4_SUPPORT && !PPP_IPV6_SUPPORT
	#error "PPP_SUPPORT needs PPP_IPV4_SUPPORT and/or PPP_IPV6_SUPPORT turned on"
	#endif
	#if PPP_SUPPORT && PPP_IPV4_SUPPORT && !LWIP_IPV4
	#error "PPP_IPV4_SUPPORT needs LWIP_IPV4 turned on"
	#endif
	#if PPP_SUPPORT && PPP_IPV6_SUPPORT && !LWIP_IPV6
	#error "PPP_IPV6_SUPPORT needs LWIP_IPV6 turned on"
	#endif
	#if !LWIP_ETHERNET && (LWIP_ARP \|\| PPPOE_SUPPORT)
	#error "LWIP_ETHERNET needs to be turned on for LWIP_ARP or PPPOE_SUPPORT"
	#endif
	#if LWIP_TCPIP_CORE_LOCKING_INPUT && !LWIP_TCPIP_CORE_LOCKING
	#error "When using LWIP_TCPIP_CORE_LOCKING_INPUT, LWIP_TCPIP_CORE_LOCKING must be enabled, too"
	#endif
	#if LWIP_TCP && LWIP_NETIF_TX_SINGLE_PBUF && !TCP_OVERSIZE
	#error "LWIP_NETIF_TX_SINGLE_PBUF needs TCP_OVERSIZE enabled to create single-pbuf TCP packets"
	#endif
	#if LWIP_NETCONN && LWIP_TCP
	#if NETCONN_COPY != TCP_WRITE_FLAG_COPY
	#error "NETCONN_COPY != TCP_WRITE_FLAG_COPY"
	#endif
	#if NETCONN_MORE != TCP_WRITE_FLAG_MORE
	#error "NETCONN_MORE != TCP_WRITE_FLAG_MORE"
	#endif
	#endif /* LWIP_NETCONN && LWIP_TCP */
	#if LWIP_NETCONN_FULLDUPLEX && !LWIP_NETCONN_SEM_PER_THREAD
	#error "For LWIP_NETCONN_FULLDUPLEX to work, LWIP_NETCONN_SEM_PER_THREAD is required"
	#endif


	/* Compile-time checks for deprecated options.
	*/
	#ifdef MEMP_NUM_TCPIP_MSG
	#error "MEMP_NUM_TCPIP_MSG option is deprecated. Remove it from your lwipopts.h."
	#endif
	#ifdef TCP_REXMIT_DEBUG
	#error "TCP_REXMIT_DEBUG option is deprecated. Remove it from your lwipopts.h."
	#endif
	#ifdef RAW_STATS
	#error "RAW_STATS option is deprecated. Remove it from your lwipopts.h."
	#endif
	#ifdef ETHARP_QUEUE_FIRST
	#error "ETHARP_QUEUE_FIRST option is deprecated. Remove it from your lwipopts.h."
	#endif
	#ifdef ETHARP_ALWAYS_INSERT
	#error "ETHARP_ALWAYS_INSERT option is deprecated. Remove it from your lwipopts.h."
	#endif
	#if !NO_SYS && LWIP_TCPIP_CORE_LOCKING && LWIP_COMPAT_MUTEX && !defined(LWIP_COMPAT_MUTEX_ALLOWED)
	#error "LWIP_COMPAT_MUTEX cannot prevent priority inversion. It is recommended to implement priority-aware mutexes. (Define LWIP_COMPAT_MUTEX_ALLOWED to disable this error.)"
	#endif

	#ifndef LWIP_DISABLE_TCP_SANITY_CHECKS
	#define LWIP_DISABLE_TCP_SANITY_CHECKS 0
	#endif
	#ifndef LWIP_DISABLE_MEMP_SANITY_CHECKS
	#define LWIP_DISABLE_MEMP_SANITY_CHECKS 0
	#endif

	/* MEMP sanity checks */
	#if MEMP_MEM_MALLOC
	#if !LWIP_DISABLE_MEMP_SANITY_CHECKS
	#if LWIP_NETCONN \|\| LWIP_SOCKET
	#if !MEMP_NUM_NETCONN && LWIP_SOCKET
	#error "lwip_sanity_check: WARNING: MEMP_NUM_NETCONN cannot be 0 when using sockets!"
	#endif
	#else /* MEMP_MEM_MALLOC */
	#if MEMP_NUM_NETCONN > (MEMP_NUM_TCP_PCB+MEMP_NUM_TCP_PCB_LISTEN+MEMP_NUM_UDP_PCB+MEMP_NUM_RAW_PCB)
	#error "lwip_sanity_check: WARNING: MEMP_NUM_NETCONN should be less than the sum of MEMP_NUM_{TCP,RAW,UDP}_PCB+MEMP_NUM_TCP_PCB_LISTEN. If you know what you are doing, define LWIP_DISABLE_MEMP_SANITY_CHECKS to 1 to disable this error."
	#endif
	#endif /* LWIP_NETCONN \|\| LWIP_SOCKET */
	#endif /* !LWIP_DISABLE_MEMP_SANITY_CHECKS */
	#if MEM_USE_POOLS
	#error "MEMP_MEM_MALLOC and MEM_USE_POOLS cannot be enabled at the same time"
	#endif
	#ifdef LWIP_HOOK_MEMP_AVAILABLE
	#error "LWIP_HOOK_MEMP_AVAILABLE doesn't make sense with MEMP_MEM_MALLOC"
	#endif
	#endif /* MEMP_MEM_MALLOC */

	/* TCP sanity checks */
	#if !LWIP_DISABLE_TCP_SANITY_CHECKS
	#if LWIP_TCP
	#if !MEMP_MEM_MALLOC && (MEMP_NUM_TCP_SEG < TCP_SND_QUEUELEN)
	#error "lwip_sanity_check: WARNING: MEMP_NUM_TCP_SEG should be at least as big as TCP_SND_QUEUELEN. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
	#endif
	#if TCP_SND_BUF < (2 * TCP_MSS)
	#error "lwip_sanity_check: WARNING: TCP_SND_BUF must be at least as much as (2 * TCP_MSS) for things to work smoothly. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
	#endif
	#if TCP_SND_QUEUELEN < (2 * (TCP_SND_BUF / TCP_MSS))
	#error "lwip_sanity_check: WARNING: TCP_SND_QUEUELEN must be at least as much as (2 * TCP_SND_BUF/TCP_MSS) for things to work. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
	#endif
	#if TCP_SNDLOWAT >= TCP_SND_BUF
	#error "lwip_sanity_check: WARNING: TCP_SNDLOWAT must be less than TCP_SND_BUF. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
	#endif
	#if TCP_SNDLOWAT >= (0xFFFF - (4 * TCP_MSS))
	#error "lwip_sanity_check: WARNING: TCP_SNDLOWAT must at least be 4*MSS below u16_t overflow!"
	#endif
	#if TCP_SNDQUEUELOWAT >= TCP_SND_QUEUELEN
	#error "lwip_sanity_check: WARNING: TCP_SNDQUEUELOWAT must be less than TCP_SND_QUEUELEN. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
	#endif
	#if !MEMP_MEM_MALLOC && PBUF_POOL_SIZE && (PBUF_POOL_BUFSIZE <= (PBUF_LINK_ENCAPSULATION_HLEN + PBUF_LINK_HLEN + PBUF_IP_HLEN + PBUF_TRANSPORT_HLEN))
	#error "lwip_sanity_check: WARNING: PBUF_POOL_BUFSIZE does not provide enough space for protocol headers. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
	#endif
	#if !MEMP_MEM_MALLOC && PBUF_POOL_SIZE && (TCP_WND > (PBUF_POOL_SIZE * (PBUF_POOL_BUFSIZE - (PBUF_LINK_ENCAPSULATION_HLEN + PBUF_LINK_HLEN + PBUF_IP_HLEN + PBUF_TRANSPORT_HLEN))))
	#error "lwip_sanity_check: WARNING: TCP_WND is larger than space provided by PBUF_POOL_SIZE * (PBUF_POOL_BUFSIZE - protocol headers). If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
	#endif
	#if TCP_WND < TCP_MSS
	#error "lwip_sanity_check: WARNING: TCP_WND is smaller than MSS. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
	#endif
	#endif /* LWIP_TCP */
	#endif /* !LWIP_DISABLE_TCP_SANITY_CHECKS */

	/**
	* @ingroup lwip_nosys
	* Initialize all modules.
	* Use this in NO_SYS mode. Use tcpip_init() otherwise.
	*/
	void
	lwip_init(void)
	{
	#ifndef LWIP_SKIP_CONST_CHECK
	int a = 0;
	LWIP_UNUSED_ARG(a);
	LWIP_ASSERT("LWIP_CONST_CAST not implemented correctly. Check your lwIP port.", LWIP_CONST_CAST(void *, &a) == &a);
	#endif
	#ifndef LWIP_SKIP_PACKING_CHECK
	LWIP_ASSERT("Struct packing not implemented correctly. Check your lwIP port.", sizeof(struct packed_struct_test) == PACKED_STRUCT_TEST_EXPECTED_SIZE);
	#endif

	/* Modules initialization */
	stats_init();
	#if !NO_SYS
	sys_init();
	#endif /* !NO_SYS */
	mem_init();
	memp_init();
	pbuf_init();
	netif_init();
	#if LWIP_IPV4
	ip_init();
	#if LWIP_ARP
	etharp_init();
	#endif /* LWIP_ARP */
	#endif /* LWIP_IPV4 */
	#if LWIP_RAW
	raw_init();
	#endif /* LWIP_RAW */
	#if LWIP_UDP
	udp_init();
	#endif /* LWIP_UDP */
	#if LWIP_TCP
	tcp_init();
	#endif /* LWIP_TCP */
	#if LWIP_IGMP
	igmp_init();
	#endif /* LWIP_IGMP */
	#if LWIP_DNS
	dns_init();
	#endif /* LWIP_DNS */
	#if PPP_SUPPORT
	ppp_init();
	#endif

	#if LWIP_TIMERS
	sys_timeouts_init();
	#endif /* LWIP_TIMERS */
	}