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/tcp_impl.h"
  #include "lwip/snmp_msg.h"
  #include "lwip/autoip.h"
  #include "lwip/igmp.h"
  #include "lwip/dns.h"
  #include "lwip/timers.h"
  #include "netif/etharp.h"
  #include "lwip/ip6.h"
  #include "lwip/nd6.h"
  #include "lwip/mld6.h"
  #include "lwip/api.h"
  
  /* 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_SNMP)
    #error "If you want to use SNMP, 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_IGMP)
    #error "If you want to use IGMP, you have to define LWIP_UDP=1 in your lwipopts.h"
  #endif
  #if (!LWIP_UDP && LWIP_SNMP)
    #error "If you want to use SNMP, you have to define LWIP_UDP=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_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_TCP + IP_REASSEMBLY + LWIP_ARP + (2*LWIP_DHCP) + LWIP_AUTOIP + LWIP_IGMP + LWIP_DNS + PPP_SUPPORT + (LWIP_IPV6 ? (1 + LWIP_IPV6_REASS + LWIP_IPV6_MLD) : 0)))
    #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_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"
  //#endif
  #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_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_NETCONN && LWIP_SOCKET)
    #error "If you want to use Socket API, you have to define LWIP_NETCONN=1 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_SNMP && (SNMP_CONCURRENT_REQUESTS<=0))
    #error "If you want to use SNMP, you have to define SNMP_CONCURRENT_REQUESTS>=1 in your lwipopts.h"
  #endif
  #if (LWIP_SNMP && (SNMP_TRAP_DESTINATIONS<=0))
    #error "If you want to use SNMP, you have to define SNMP_TRAP_DESTINATIONS>=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 (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
    #error "PPP_SUPPORT needs either PPPOS_SUPPORT or PPPOE_SUPPORT 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_IGMP || LWIP_IPV6) && !defined(LWIP_RAND)
    #error "When using IGMP or IPv6, LWIP_RAND() needs to be defined to a random-function returning an u32_t random value"
  #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 IP_FRAG && IP_FRAG_USES_STATIC_BUF && LWIP_NETIF_TX_SINGLE_PBUF
    #error "LWIP_NETIF_TX_SINGLE_PBUF does not work with IP_FRAG_USES_STATIC_BUF==1 as that creates pbuf queues"
  #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
  /* Check that the SO_* socket options and SOF_* lwIP-internal flags match */
  #if SO_ACCEPTCONN != SOF_ACCEPTCONN
    #error "SO_ACCEPTCONN != SOF_ACCEPTCONN"
  #endif
  #if SO_REUSEADDR != SOF_REUSEADDR
    #error "WARNING: SO_REUSEADDR != SOF_REUSEADDR"
  #endif
  #if SO_KEEPALIVE != SOF_KEEPALIVE
    #error "WARNING: SO_KEEPALIVE != SOF_KEEPALIVE"
  #endif
  #if SO_BROADCAST != SOF_BROADCAST
    #error "WARNING: SO_BROADCAST != SOF_BROADCAST"
  #endif
  #if SO_LINGER != SOF_LINGER
    #error "WARNING: SO_LINGER != SOF_LINGER"
  #endif
  #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 MEMP_NUM_API_MSG
    #error "MEMP_NUM_API_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
  
  #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 !LWIP_DISABLE_MEMP_SANITY_CHECKS
  #if LWIP_NETCONN
  #if MEMP_MEM_MALLOC
  #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 /* MEMP_MEM_MALLOC */
  #endif /* LWIP_NETCONN */
  #endif /* !LWIP_DISABLE_MEMP_SANITY_CHECKS */
  
  /* 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_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_BUFSIZE <= (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 && (TCP_WND > (PBUF_POOL_SIZE * (PBUF_POOL_BUFSIZE - (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 */
  
  /**
   * Perform Sanity check of user-configurable values, and initialize all modules.
   */
  void
  lwip_init(void)
  {
  //  MEMP_NUM_TCP_PCB = 5;
  //  TCP_WND = (4 * TCP_MSS);
  //  TCP_MAXRTX = 12;
  //  TCP_SYNMAXRTX = 6;
    /* Modules initialization */
    stats_init();
  #if !NO_SYS
    sys_init();
  #endif /* !NO_SYS */
    mem_init();
    memp_init();
    pbuf_init();
    netif_init();
  #if LWIP_SOCKET
    lwip_socket_init();
  #endif /* LWIP_SOCKET */
    ip_init();
  #if LWIP_ARP
    etharp_init();
  #endif /* LWIP_ARP */
  #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_SNMP
    snmp_init();
  #endif /* LWIP_SNMP */
  #if LWIP_AUTOIP
    autoip_init();
  #endif /* LWIP_AUTOIP */
  #if LWIP_IGMP
    igmp_init();
  #endif /* LWIP_IGMP */
  #if LWIP_DNS
    dns_init();
  #endif /* LWIP_DNS */
  #if LWIP_IPV6
    ip6_init();
    nd6_init();
  #if LWIP_IPV6_MLD
    mld6_init();
  #endif /* LWIP_IPV6_MLD */
  #endif /* LWIP_IPV6 */
  
  #if LWIP_TIMERS
    sys_timeouts_init();
  #endif /* LWIP_TIMERS */
  }
  