text: /**
   * @file
   * IPv6 protocol definitions
   */
  
  /*
   * 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>
   *
   */
  #ifndef LWIP_HDR_PROT_IP6_H
  #define LWIP_HDR_PROT_IP6_H
  
  #include "ETH_LWIP/lwip/include/lwip/arch.h"
  #include "ETH_LWIP/lwip/include/lwip/ip6_addr.h"
  
  #ifdef __cplusplus
  extern "C" {
  #endif
     
  /** This is the packed version of ip6_addr_t,
      used in network headers that are itself packed */
  #ifdef PACK_STRUCT_USE_INCLUDES
  #  include "ETH_LWIP/lwip/port/include/arch/bpstruct.h"
  #endif
  PACK_STRUCT_BEGIN
  struct ip6_addr_packed {
    PACK_STRUCT_FIELD(u32_t addr[4]);
  } PACK_STRUCT_STRUCT;
  PACK_STRUCT_END
  #ifdef PACK_STRUCT_USE_INCLUDES
  #  include "ETH_LWIP/lwip/port/include/arch/epstruct.h"
  #endif
  typedef struct ip6_addr_packed ip6_addr_p_t;
  
  #define IP6_HLEN 40
  
  #define IP6_NEXTH_HOPBYHOP  0
  #define IP6_NEXTH_TCP       6
  #define IP6_NEXTH_UDP       17
  #define IP6_NEXTH_ENCAPS    41
  #define IP6_NEXTH_ROUTING   43
  #define IP6_NEXTH_FRAGMENT  44
  #define IP6_NEXTH_ICMP6     58
  #define IP6_NEXTH_NONE      59
  #define IP6_NEXTH_DESTOPTS  60
  #define IP6_NEXTH_UDPLITE   136
  
  /** The IPv6 header. */
  #ifdef PACK_STRUCT_USE_INCLUDES
  #  include "ETH_LWIP/lwip/port/include/arch/bpstruct.h"
  #endif
  PACK_STRUCT_BEGIN
  struct ip6_hdr {
    /** version / traffic class / flow label */
    PACK_STRUCT_FIELD(u32_t _v_tc_fl);
    /** payload length */
    PACK_STRUCT_FIELD(u16_t _plen);
    /** next header */
    PACK_STRUCT_FLD_8(u8_t _nexth);
    /** hop limit */
    PACK_STRUCT_FLD_8(u8_t _hoplim);
    /** source and destination IP addresses */
    PACK_STRUCT_FLD_S(ip6_addr_p_t src);
    PACK_STRUCT_FLD_S(ip6_addr_p_t dest);
  } PACK_STRUCT_STRUCT;
  PACK_STRUCT_END
  #ifdef PACK_STRUCT_USE_INCLUDES
  #  include "ETH_LWIP/lwip/port/include/arch/epstruct.h"
  #endif
  
  /* Hop-by-hop router alert option. */
  #define IP6_HBH_HLEN    8
  #define IP6_PAD1_OPTION         0
  #define IP6_PADN_ALERT_OPTION   1
  #define IP6_ROUTER_ALERT_OPTION 5
  #define IP6_ROUTER_ALERT_VALUE_MLD 0
  #ifdef PACK_STRUCT_USE_INCLUDES
  #  include "ETH_LWIP/lwip/port/include/arch/bpstruct.h"
  #endif
  PACK_STRUCT_BEGIN
  struct ip6_hbh_hdr {
    /* next header */
    PACK_STRUCT_FLD_8(u8_t _nexth);
    /* header length */
    PACK_STRUCT_FLD_8(u8_t _hlen);
    /* router alert option type */
    PACK_STRUCT_FLD_8(u8_t _ra_opt_type);
    /* router alert option data len */
    PACK_STRUCT_FLD_8(u8_t _ra_opt_dlen);
    /* router alert option data */
    PACK_STRUCT_FIELD(u16_t _ra_opt_data);
    /* PadN option type */
    PACK_STRUCT_FLD_8(u8_t _padn_opt_type);
    /* PadN option data len */
    PACK_STRUCT_FLD_8(u8_t _padn_opt_dlen);
  } PACK_STRUCT_STRUCT;
  PACK_STRUCT_END
  #ifdef PACK_STRUCT_USE_INCLUDES
  #  include "ETH_LWIP/lwip/port/include/arch/epstruct.h"
  #endif
  
  /* Fragment header. */
  #define IP6_FRAG_HLEN    8
  #define IP6_FRAG_OFFSET_MASK    0xfff8
  #define IP6_FRAG_MORE_FLAG      0x0001
  #ifdef PACK_STRUCT_USE_INCLUDES
  #  include "ETH_LWIP/lwip/port/include/arch/bpstruct.h"
  #endif
  PACK_STRUCT_BEGIN
  struct ip6_frag_hdr {
    /* next header */
    PACK_STRUCT_FLD_8(u8_t _nexth);
    /* reserved */
    PACK_STRUCT_FLD_8(u8_t reserved);
    /* fragment offset */
    PACK_STRUCT_FIELD(u16_t _fragment_offset);
    /* fragmented packet identification */
    PACK_STRUCT_FIELD(u32_t _identification);
  } PACK_STRUCT_STRUCT;
  PACK_STRUCT_END
  #ifdef PACK_STRUCT_USE_INCLUDES
  #  include "ETH_LWIP/lwip/port/include/arch/epstruct.h"
  #endif
  
  #define IP6H_V(hdr)  ((lwip_ntohl((hdr)->_v_tc_fl) >> 28) & 0x0f)
  #define IP6H_TC(hdr) ((lwip_ntohl((hdr)->_v_tc_fl) >> 20) & 0xff)
  #define IP6H_FL(hdr) (lwip_ntohl((hdr)->_v_tc_fl) & 0x000fffff)
  #define IP6H_PLEN(hdr) (lwip_ntohs((hdr)->_plen))
  #define IP6H_NEXTH(hdr) ((hdr)->_nexth)
  #define IP6H_NEXTH_P(hdr) ((u8_t *)(hdr) + 6)
  #define IP6H_HOPLIM(hdr) ((hdr)->_hoplim)
  
  #define IP6H_VTCFL_SET(hdr, v, tc, fl) (hdr)->_v_tc_fl = (lwip_htonl((((u32_t)(v)) << 28) | (((u32_t)(tc)) << 20) | (fl)))
  #define IP6H_PLEN_SET(hdr, plen) (hdr)->_plen = lwip_htons(plen)
  #define IP6H_NEXTH_SET(hdr, nexth) (hdr)->_nexth = (nexth)
  #define IP6H_HOPLIM_SET(hdr, hl) (hdr)->_hoplim = (u8_t)(hl)
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* LWIP_HDR_PROT_IP6_H */
  