text: /**************************************************************************/
  /*                                                                        */
  /*       Copyright (c) Microsoft Corporation. All rights reserved.        */
  /*                                                                        */
  /*       This software is licensed under the Microsoft Software License   */
  /*       Terms for Microsoft Azure RTOS. Full text of the license can be  */
  /*       found in the LICENSE file at https://aka.ms/AzureRTOS_EULA       */
  /*       and in the root directory of this software.                      */
  /*                                                                        */
  /**************************************************************************/
  
  
  /**************************************************************************/
  /**************************************************************************/
  /**                                                                       */
  /** NetX Component                                                        */
  /**                                                                       */
  /**   Internet Protocol version 6 (IPv6) for STM32L475E-IOT01A1           */
  /**                                                                       */
  /**************************************************************************/
  /**************************************************************************/
  
  
  /**************************************************************************/
  /*                                                                        */
  /*  COMPONENT DEFINITION                                   RELEASE        */
  /*                                                                        */
  /*    nx_ipv6.h                                           PORTABLE C      */
  /*                                                           6.0          */
  /*  AUTHOR                                                                */
  /*                                                                        */
  /*    Yuxin Zhou, Microsoft Corporation                                   */
  /*                                                                        */
  /*  DESCRIPTION                                                           */
  /*                                                                        */
  /*    This file defines the NetX Internet Protocol component,             */
  /*    including all data types and external references.  It is assumed    */
  /*    that nx_api.h and nx_port.h have already been included.             */
  /*                                                                        */
  /*    This header file is for NetX Duo internal use only.  Application    */
  /*    shall not include this file directly.                               */
  /*                                                                        */
  /*  RELEASE HISTORY                                                       */
  /*                                                                        */
  /*    DATE              NAME                      DESCRIPTION             */
  /*                                                                        */
  /*  05-19-2020     Yuxin Zhou               Initial Version 6.0           */
  /*                                                                        */
  /**************************************************************************/
  
  #ifndef NX_IPV6_H
  #define NX_IPV6_H
  
  #include "tx_api.h"
  #ifdef FEATURE_NX_IPV6
  
  /* Define basic IP Header constant.  */
  
  /* Define Basic Internet packet header data type.  This will be used to
     build new IP packets and to examine incoming packets into NetX.  */
  
  typedef  struct NX_IPV6_HEADER_STRUCT
  {
      /*
         Define the first 32-bit word of the IP header.  This word contains
         the following information:
  
              bits 31-28  IP Version = 0x6  (IP Version6)
              bits 27-20  Traffic Class
              bits 19-00  Flow Lable
       */
      ULONG nx_ip_header_word_0;
  
      /*
         Define the second word of the IP header.  This word contains
         the following information:
  
              bits 31-16  Payload Length
              bits 15-8   Next Header;
              bits  7-0   Hop limit
       */
      ULONG nx_ip_header_word_1;
  
      /* Sender IP address. */
      ULONG nx_ip_header_source_ip[4];
  
      /* Define the destination IP address.  */
      ULONG nx_ip_header_destination_ip[4];
  } NX_IPV6_HEADER;
  
  
  /* Define the data structure of the IPv6 optional field used in
     hop-by-hop option and destination option headers. */
  typedef struct NX_IPV6_HEADER_OPTION_STRUCT
  {
  
      /* A hint to the protocol that follows. */
      UCHAR nx_ipv6_header_option_next_header;
  
      /* Size of this option field.*/
      UCHAR nx_ipv6_header_option_ext_length;
  
      /* ICMPv6 Option header type. */
      /*lint -esym(768,NX_IPV6_HEADER_OPTION_STRUCT::nx_ipv6_header_option_type) suppress member not referenced. It is not used as a host. */
      UCHAR nx_ipv6_header_option_type;
  
      /* ICMPv6 Option-specific area. */
      /*lint -esym(768,NX_IPV6_HEADER_OPTION_STRUCT::nx_ipv6_header_option_data) suppress member not referenced. It is not used as a host. */
      UCHAR nx_ipv6_header_option_data;
  } NX_IPV6_HEADER_OPTION;
  
  
  /* Hop by hop header optoin. */
  typedef struct NX_IPV6_HOP_BY_HOP_OPTION_STRUCT
  {
      /* Option type. */
      UCHAR nx_ipv6_hop_by_hop_option_type;
  
      /* Size of this option field.*/
      UCHAR nx_ipv6_hop_by_hop_length;
  
      /* Start point of the option data. */
      /*lint -esym(768,NX_IPV6_HOP_BY_HOP_OPTION_STRUCT::nx_ipv6_hop_by_hop_data) suppress member not referenced. It is not used as a host. */
      USHORT nx_ipv6_hop_by_hop_data;
  } NX_IPV6_HOP_BY_HOP_OPTION;
  
  
  /* Routing header option. */
  typedef struct NX_IPV6_HEADER_ROUTING_OPTION_STRUCT
  {
  
      /* A hint to the protocol that follows. */
      /*lint -esym(768,NX_IPV6_HEADER_ROUTING_OPTION_STRUCT::nx_ipv6_header_routing_option_next_header) suppress member not referenced. It is not used as a host. */
      UCHAR nx_ipv6_header_routing_option_next_header;
  
      /* Header length. */
      /*lint -esym(768,NX_IPV6_HEADER_ROUTING_OPTION_STRUCT::nx_ipv6_header_routing_option_hdr_ext_len) suppress member not referenced. It is not used as a host. */
      UCHAR nx_ipv6_header_routing_option_hdr_ext_len;
  
      /* Router type. */
      /*lint -esym(768,NX_IPV6_HEADER_ROUTING_OPTION_STRUCT::nx_ipv6_header_routing_option_routing_type) suppress member not referenced. It is not used as a host. */
      UCHAR nx_ipv6_header_routing_option_routing_type;
  
      /* Segments left. */
      UCHAR nx_ipv6_header_routing_option_segments_left;
  
      /* Data. */
      /*lint -esym(768,NX_IPV6_HEADER_ROUTING_OPTION_STRUCT::nx_ipv6_header_routing_option_data) suppress member not referenced. It is not used as a host. */
      ULONG *nx_ipv6_header_routing_option_data;
  } NX_IPV6_HEADER_ROUTING_OPTION;
  
  /* Fragment header option. */
  typedef struct NX_IPV6_HEADER_FRAGMENT_OPTION_STRUCT
  {
      /* A hint to the protocol that follows. */
      UCHAR nx_ipv6_header_fragment_option_next_header;
  
      /* Unused field. */
      UCHAR nx_ipv6_header_fragment_option_reserved;
  
      /* Fragment offset. Last 3 bits are used as flags. */
      USHORT nx_ipv6_header_fragment_option_offset_flag;
  
      /* ID field. */
      ULONG nx_ipv6_header_fragment_option_packet_id;
  } NX_IPV6_HEADER_FRAGMENT_OPTION;
  
  /* Unicast address type.  Note that site local address types have been
     deprectated in RFC 4291 and are treated as global address types. */
  #define IPV6_ADDRESS_LINKLOCAL    0x00000001
  /*
  #define IPV6_ADDRESS_SITELOCAL    0x00000002
   */
  #define IPV6_ADDRESS_GLOBAL       0x00000004
  
  /* Multicast address type */
  #define IPV6_ALL_NODE_MCAST       0x00000010
  #define IPV6_ALL_ROUTER_MCAST     0x00000020
  #define IPV6_SOLICITED_NODE_MCAST 0x00000040
  
  #define IPV6_ADDRESS_UNICAST      0x80000000
  #define IPV6_ADDRESS_MULTICAST    0x40000000
  #define IPV6_ADDRESS_UNSPECIFIED  0x20000000
  #define IPV6_ADDRESS_LOOPBACK     0x10000000
  
  
  
  /*
      The following symbols define the order of the IPv6 optional
      headers.  Each value represents a state during the parse of the
      optional headers.  An error occurs when the parser encounters
      an optional header when it is not expecting the header, i.e.
      the header is out of order. .
  
  
      IPv6 defines the order of the optional headers: (RFC2460 section 4.1)
      * IPv6 Header
      * Hop-by-Hop Options header
      * Destination Options header
      * Routnig header
      * Fragment header
      * Authentication header
      * Encapsulating Security Payload header
      * Destination Options header
      * Upper-layer header
   */
  enum NX_IPV6_OPTION_STATE
  {
      IPV6_BASE_HEADER,               /* 0 */
      HOP_BY_HOP_HEADER,              /* 1 */
      DESTINATION_HEADER_1,           /* 2 */
      ROUTING_HEADER,                 /* 3 */
      FRAGMENT_HEADER,                /* 4 */
  #ifdef NX_IPSEC_ENABLE
      AUTHENTICATION_HEADER,          /* 5 */
      ENCAP_SECURITY_HEADER,          /* 6 */
  #endif /* NX_IPSEC_ENABLE */
      DESTINATION_HEADER_2            /* 7 */
  };
  
  
  
  #if 0 /* Not support for STM32L475E-IOT01A1.  */
  /* Define IPv6 internal functions. */
  
  UINT  _nxd_ipv6_default_router_add_internal(NX_IP *ip_ptr, ULONG *router_addr, ULONG router_lifetime, NX_INTERFACE *if_ptr, INT router_type, NX_IPV6_DEFAULT_ROUTER_ENTRY **_new_entry);
  VOID  _nxd_ipv6_default_router_table_init(NX_IP *ip_ptr);
  UINT  _nxd_ipv6_find_max_prefix_length(ULONG *addr1, ULONG *addr, UINT max_length);
  VOID  _nx_ipv6_fragment_process(struct NX_IP_DRIVER_STRUCT *driver_req_ptr, UINT mtu);
  UINT  _nx_ipv6_header_add(NX_IP *ip_ptr, NX_PACKET **packet_pptr,
                            ULONG protocol, ULONG payload_size, ULONG hop_limit,
                            ULONG *src_address, ULONG *dest_address, ULONG *fragment);
  UINT  _nx_ipv6_packet_copy(NX_PACKET *source_pkt_head, NX_PACKET *dest_pkt_head, UINT size);
  UINT  _nx_ipv6_multicast_join(NX_IP *, ULONG *, NX_INTERFACE *);
  UINT  _nx_ipv6_multicast_leave(NX_IP *, ULONG *, NX_INTERFACE *);
  UINT  _nx_ipv6_option_error(NX_IP *ip_ptr, NX_PACKET *packet_ptr, UCHAR option_type, UINT offset);
  VOID  _nx_ipv6_packet_receive(NX_IP *ip_ptr, NX_PACKET *packet_ptr);
  VOID  _nx_ipv6_packet_send(NX_IP *ip_ptr, NX_PACKET *packet_ptr, ULONG protocol, ULONG payload_size, ULONG hop_limit, ULONG *src_address, ULONG *dest_address);
  UINT  _nx_ipv6_prefix_list_add_entry(NX_IP *ip_ptr, ULONG *prefix, ULONG prefix_length, ULONG valid_lifetime);
  VOID  _nx_ipv6_prefix_list_delete(NX_IP *ip_ptr, ULONG *prefix, INT prefix_length);
  VOID  _nx_ipv6_prefix_list_delete_entry(NX_IP *ip_ptr, NX_IPV6_PREFIX_ENTRY *entry);
  UINT  _nx_ipv6_process_hop_by_hop_option(NX_IP *ip_ptr, NX_PACKET *packet_ptr);
  UINT  _nx_ipv6_process_routing_option(NX_IP *ip_ptr, NX_PACKET *packet_ptr);
  UINT  _nx_ipv6_process_fragment_option(NX_IP *ip_ptr, NX_PACKET *packet_ptr);
  
  UINT  _nxd_ipv6_interface_find(NX_IP *ip_ptr, ULONG *dest_address,
                                 NXD_IPV6_ADDRESS **ipv6_addr, NX_INTERFACE *if_ptr);
  UINT  _nxd_ipv6_router_lookup(NX_IP *ip_ptr, NX_INTERFACE *if_ptr, ULONG *router_address, void **nd_cache_entry);
  VOID  _nxd_ipv6_router_solicitation_check(NX_IP *ip_ptr);
  UINT  _nxd_ipv6_raw_packet_send_internal(NX_IP *ip_ptr, NX_PACKET *packet_ptr,  NXD_ADDRESS *destination_ip, ULONG protocol);
  VOID  _nxd_ipv6_prefix_router_timer_tick(NX_IP *ip_ptr);
  NX_IPV6_DEFAULT_ROUTER_ENTRY* _nxd_ipv6_find_default_router_from_address(NX_IP *ip_ptr, ULONG *ip_addr);
  INT   _nxd_ipv6_search_onlink(NX_IP *ip_ptr, ULONG *dest_addr);
  
  #endif /* FEATURE_NX_IPV6 */
  
  
  
  /*
     If NX_IPV6_UTIL_INLINE is defined, the functions are compiled as inline functions.
     Inline functions improve execution speed.  However it also increases code size.
     Applications concerning more about code size should have the symbol undefeind
     when building NetX Duo library and the application.
   */
  #ifndef NX_IPV6_UTIL_INLINE
  
  #ifdef NX_IPSEC_ENABLE
  INT  CHECK_IPV6_ADDRESS_RANGE(ULONG *ip_addr_start, ULONG *ip_addr_end, ULONG *ip_addr);
  #endif /* NX_IPSEC_ENABLE */
  INT  CHECK_IPV6_ADDRESSES_SAME(ULONG *ip_dest, ULONG *myip);
  INT  CHECK_UNSPECIFIED_ADDRESS(ULONG *ip_addr);
  void SET_UNSPECIFIED_ADDRESS(ULONG *ip_addr);
  void COPY_IPV6_ADDRESS(ULONG *copy_from, ULONG *copy_to);
  void COPY_NXD_ADDRESS(NXD_ADDRESS *copy_from, NXD_ADDRESS  *copy_to);
  void SET_SOLICITED_NODE_MULTICAST_ADDRESS(ULONG *address, ULONG *unicast_address);
  INT  CHECK_ALL_ROUTER_MCAST_ADDRESS(ULONG *address);
  VOID _nx_ipv6_address_change_endian(ULONG *address);
  
  #endif /* NX_IPV6_UTIL_INLINE */
  INT   CHECK_IP_ADDRESSES_BY_PREFIX(ULONG *ip_addr1, ULONG *ip_addr2, ULONG prefix_len);
  INT   CHECK_IPV6_SOLICITED_NODE_MCAST_ADDRESS(ULONG *dest_ip, ULONG *myip);
  ULONG IPv6_Address_Type(ULONG *ip_address);
  
  /* Define IPv6 API function prototype. */
  UINT _nxd_ipv6_enable(NX_IP *ip_ptr);
  UINT _nxd_ipv6_disable(NX_IP *ip_ptr);
  UINT _nxd_ipv6_address_get(NX_IP *ip_ptr, UINT address_index, NXD_ADDRESS *ip_address, ULONG *prefix_length, UINT *interface_index);
  UINT _nxd_ipv6_address_set(NX_IP *ip_ptr, UINT interface_index, NXD_ADDRESS *ip_address, ULONG prefix_length, UINT *address_index);
  UINT _nxd_ipv6_address_delete(NX_IP *ip_ptr, UINT address_index);
  UINT _nxd_ipv6_address_change_notify(NX_IP *ip_ptr, VOID (*ipv6_address_change_notfiy)(NX_IP *ip_ptr, UINT status, UINT interface_index, UINT address_index, ULONG *ip_address));
  UINT _nxd_ipv6_default_router_add(NX_IP *ip_ptr, NXD_ADDRESS *router_addr, ULONG router_lifetime, UINT interface_index);
  UINT _nxd_ipv6_default_router_delete(NX_IP *ip_ptr, NXD_ADDRESS *router_address);
  UINT _nxd_ipv6_default_router_get(NX_IP *ip_ptr, UINT interface_index, NXD_ADDRESS *router_addr, ULONG *router_lifetime, ULONG *prefix_length);
  UINT _nxd_ipv6_default_router_entry_get(NX_IP *ip_ptr, UINT interface_index, UINT entry_index, NXD_ADDRESS *router_addr, ULONG *router_lifetime, ULONG *prefix_length, ULONG *configuration_method);
  UINT _nxd_ipv6_default_router_number_of_entries_get(NX_IP *ip_ptr, UINT interface_index, UINT *num_entries);
  UINT _nxd_ipv6_multicast_interface_join(NX_IP *ip_ptr, NXD_ADDRESS *group_address, UINT interface_index);
  UINT _nxd_ipv6_multicast_interface_leave(NX_IP *ip_ptr, NXD_ADDRESS *group_address, UINT interface_index);
  UINT _nxd_ipv6_stateless_address_autoconfig_disable(NX_IP *ip_ptr, UINT interface_index);
  UINT _nxd_ipv6_stateless_address_autoconfig_enable(NX_IP *ip_ptr, UINT interface_index);
  
  /* Define error checking shells for API services.  These are only referenced by the application.  */
  UINT _nxde_ipv6_enable(NX_IP *ip_ptr);
  UINT _nxde_ipv6_disable(NX_IP *ip_ptr);
  UINT _nxde_ipv6_stateless_address_autoconfig_disable(NX_IP *ip_ptr, UINT interface_index);
  UINT _nxde_ipv6_stateless_address_autoconfig_enable(NX_IP *ip_ptr, UINT interface_index);
  UINT _nxde_ipv6_address_get(NX_IP *ip_ptr, UINT address_index, NXD_ADDRESS *ip_address, ULONG *prefix_length, UINT *interface_index);
  UINT _nxde_ipv6_address_set(NX_IP *ip_ptr, UINT interface_index, NXD_ADDRESS *ip_address, ULONG prefix_length, UINT *address_index);
  UINT _nxde_ipv6_address_delete(NX_IP *ip_ptr, UINT address_index);
  UINT _nxde_ipv6_address_change_notify(NX_IP *ip_ptr, VOID (*ipv6_address_change_notfiy)(NX_IP *ip_ptr, UINT status, UINT interface_index, UINT address_index, ULONG *ip_address));
  UINT _nxde_ipv6_default_router_add(NX_IP *ip_ptr, NXD_ADDRESS *router_addr, ULONG router_lifetime, UINT interface_index);
  UINT _nxde_ipv6_default_router_delete(NX_IP *ip_ptr, NXD_ADDRESS *router_address);
  UINT _nxde_ipv6_default_router_get(NX_IP *ip_ptr, UINT interface_index, NXD_ADDRESS *router_addr, ULONG *router_lifetime, ULONG *prefix_length);
  UINT _nxde_ipv6_default_router_entry_get(NX_IP *ip_ptr, UINT interface_index, UINT entry_index, NXD_ADDRESS *router_addr, ULONG *router_lifetime, ULONG *prefix_length, ULONG *configuration_method);
  UINT _nxde_ipv6_default_router_number_of_entries_get(NX_IP *ip_ptr, UINT interface_index, UINT *num_entries);
  UINT _nxde_ip_raw_packet_send(NX_IP *ip_ptr, NX_PACKET **packet_ptr_ptr,
                                NXD_ADDRESS *destination_ip, ULONG protocol, UINT ttl, ULONG tos);
  UINT _nxde_ipv6_multicast_interface_join(NX_IP *ip_ptr, NXD_ADDRESS *group_address, UINT interface_index);
  UINT _nxde_ipv6_multicast_interface_leave(NX_IP *ip_ptr, NXD_ADDRESS *group_address, UINT interface_index);
  #endif
  
  #endif /* NX_IPV6_H */
  
  