text: /**
   * @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_SOCKET
  #endif /* LWIP_SOCKET */
  
  
  /* 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;
  #ifdef LWIP_NOASSERT /* Caused compiler warning. */
    LWIP_UNUSED_ARG(a);
  #endif
    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 */
  }
  