/****************************************************************************
 * include/netinet/icmp6.h
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************/

#ifndef __INCLUDE_NETINET_ICMP6_H
#define __INCLUDE_NETINET_ICMP6_H

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

#define ICMP6_FILTER             1

#define ICMP6_FILTER_BLOCK       1
#define ICMP6_FILTER_PASS        2
#define ICMP6_FILTER_BLOCKOTHERS 3
#define ICMP6_FILTER_PASSONLY    4

struct icmp6_filter
{
  uint32_t icmp6_filt[8];
};

struct icmp6_hdr
{
  uint8_t     icmp6_type;   /* type field */
  uint8_t     icmp6_code;   /* code field */
  uint16_t    icmp6_cksum;  /* checksum field */
  union
  {
    uint32_t  icmp6_un_data32[1]; /* type-specific field */
    uint16_t  icmp6_un_data16[2]; /* type-specific field */
    uint8_t   icmp6_un_data8[4];  /* type-specific field */
  } icmp6_dataun;
};

#define icmp6_data32    icmp6_dataun.icmp6_un_data32
#define icmp6_data16    icmp6_dataun.icmp6_un_data16
#define icmp6_data8     icmp6_dataun.icmp6_un_data8
#define icmp6_pptr      icmp6_data32[0]  /* parameter prob */
#define icmp6_mtu       icmp6_data32[0]  /* packet too big */
#define icmp6_id        icmp6_data16[0]  /* echo request/reply */
#define icmp6_seq       icmp6_data16[1]  /* echo request/reply */
#define icmp6_maxdelay  icmp6_data16[0]  /* mcast group membership */

#define ICMP6_DST_UNREACH             1
#define ICMP6_PACKET_TOO_BIG          2
#define ICMP6_TIME_EXCEEDED           3
#define ICMP6_PARAM_PROB              4

#define ICMP6_INFOMSG_MASK            0x80    /* all informational messages */

#define ICMP6_ECHO_REQUEST            128
#define ICMP6_ECHO_REPLY              129
#define MLD_LISTENER_QUERY            130
#define MLD_LISTENER_REPORT           131
#define MLD_LISTENER_REDUCTION        132

#define ICMP6_DST_UNREACH_NOROUTE     0 /* no route to destination */
#define ICMP6_DST_UNREACH_ADMIN       1 /* communication with destination */
                                        /* administratively prohibited */
#define ICMP6_DST_UNREACH_BEYONDSCOPE 2 /* beyond scope of source address */
#define ICMP6_DST_UNREACH_ADDR        3 /* address unreachable */
#define ICMP6_DST_UNREACH_NOPORT      4 /* bad port */

#define ICMP6_TIME_EXCEED_TRANSIT     0 /* Hop Limit == 0 in transit */
#define ICMP6_TIME_EXCEED_REASSEMBLY  1 /* Reassembly time out */

#define ICMP6_PARAMPROB_HEADER        0 /* erroneous header field */
#define ICMP6_PARAMPROB_NEXTHEADER    1 /* unrecognized Next Header */
#define ICMP6_PARAMPROB_OPTION        2 /* unrecognized IPv6 option */

#define ICMP6_FILTER_WILLPASS(type, filterp) \
  ((((filterp)->icmp6_filt[(type) >> 5]) & (1 << ((type) & 31))) == 0)

#define ICMP6_FILTER_WILLBLOCK(type, filterp) \
  ((((filterp)->icmp6_filt[(type) >> 5]) & (1 << ((type) & 31))) != 0)

#define ICMP6_FILTER_SETPASS(type, filterp) \
  ((((filterp)->icmp6_filt[(type) >> 5]) &= ~(1 << ((type) & 31))))

#define ICMP6_FILTER_SETBLOCK(type, filterp) \
  ((((filterp)->icmp6_filt[(type) >> 5]) |=  (1 << ((type) & 31))))

#define ICMP6_FILTER_SETPASSALL(filterp) \
  memset(filterp, 0, sizeof (struct icmp6_filter));

#define ICMP6_FILTER_SETBLOCKALL(filterp) \
  memset(filterp, 0xFF, sizeof (struct icmp6_filter));

#define ND_ROUTER_SOLICIT           133
#define ND_ROUTER_ADVERT            134
#define ND_NEIGHBOR_SOLICIT         135
#define ND_NEIGHBOR_ADVERT          136
#define ND_REDIRECT                 137

struct nd_router_solicit      /* router solicitation */
{
  struct icmp6_hdr nd_rs_hdr;

  /* could be followed by options */
};

#define nd_rs_type               nd_rs_hdr.icmp6_type
#define nd_rs_code               nd_rs_hdr.icmp6_code
#define nd_rs_cksum              nd_rs_hdr.icmp6_cksum
#define nd_rs_reserved           nd_rs_hdr.icmp6_data32[0]

struct nd_router_advert       /* router advertisement */
{
  struct icmp6_hdr nd_ra_hdr;
  uint32_t nd_ra_reachable;   /* reachable time */
  uint32_t nd_ra_retransmit;  /* retransmit timer */

  /* could be followed by options */
};

#define nd_ra_type               nd_ra_hdr.icmp6_type
#define nd_ra_code               nd_ra_hdr.icmp6_code
#define nd_ra_cksum              nd_ra_hdr.icmp6_cksum
#define nd_ra_curhoplimit        nd_ra_hdr.icmp6_data8[0]
#define nd_ra_flags_reserved     nd_ra_hdr.icmp6_data8[1]
#define ND_RA_FLAG_MANAGED       0x80
#define ND_RA_FLAG_OTHER         0x40
#define ND_RA_FLAG_HOME_AGENT    0x20
#define nd_ra_router_lifetime    nd_ra_hdr.icmp6_data16[1]

struct nd_neighbor_solicit    /* neighbor solicitation */
{
  struct icmp6_hdr nd_ns_hdr;
  struct in6_addr nd_ns_target; /* target address */

  /* could be followed by options */
};

#define nd_ns_type               nd_ns_hdr.icmp6_type
#define nd_ns_code               nd_ns_hdr.icmp6_code
#define nd_ns_cksum              nd_ns_hdr.icmp6_cksum
#define nd_ns_reserved           nd_ns_hdr.icmp6_data32[0]

struct nd_neighbor_advert     /* neighbor advertisement */
{
  struct icmp6_hdr nd_na_hdr;
  struct in6_addr nd_na_target; /* target address */

  /* could be followed by options */
};

#define nd_na_type               nd_na_hdr.icmp6_type
#define nd_na_code               nd_na_hdr.icmp6_code
#define nd_na_cksum              nd_na_hdr.icmp6_cksum
#define nd_na_flags_reserved     nd_na_hdr.icmp6_data32[0]
#if     __BYTE_ORDER == __BIG_ENDIAN
#define ND_NA_FLAG_ROUTER        0x80000000
#define ND_NA_FLAG_SOLICITED     0x40000000
#define ND_NA_FLAG_OVERRIDE      0x20000000
#else   /* __BYTE_ORDER == __LITTLE_ENDIAN */
#define ND_NA_FLAG_ROUTER        0x00000080
#define ND_NA_FLAG_SOLICITED     0x00000040
#define ND_NA_FLAG_OVERRIDE      0x00000020
#endif

struct nd_redirect            /* redirect */
{
  struct icmp6_hdr  nd_rd_hdr;
  struct in6_addr   nd_rd_target; /* target address */
  struct in6_addr   nd_rd_dst;    /* destination address */

  /* could be followed by options */
};

#define nd_rd_type               nd_rd_hdr.icmp6_type
#define nd_rd_code               nd_rd_hdr.icmp6_code
#define nd_rd_cksum              nd_rd_hdr.icmp6_cksum
#define nd_rd_reserved           nd_rd_hdr.icmp6_data32[0]

struct nd_opt_hdr             /* Neighbor discovery option header */
{
  uint8_t  nd_opt_type;
  uint8_t  nd_opt_len;        /* in units of 8 octets */

  /* followed by option specific data */
};

#define ND_OPT_SOURCE_LINKADDR    1
#define ND_OPT_TARGET_LINKADDR    2
#define ND_OPT_PREFIX_INFORMATION 3
#define ND_OPT_REDIRECTED_HEADER  4
#define ND_OPT_MTU                5
#define ND_OPT_RTR_ADV_INTERVAL   7
#define ND_OPT_HOME_AGENT_INFO    8

struct nd_opt_prefix_info     /* prefix information */
{
  uint8_t   nd_opt_pi_type;
  uint8_t   nd_opt_pi_len;
  uint8_t   nd_opt_pi_prefix_len;
  uint8_t   nd_opt_pi_flags_reserved;
  uint32_t  nd_opt_pi_valid_time;
  uint32_t  nd_opt_pi_preferred_time;
  uint32_t  nd_opt_pi_reserved2;
  struct in6_addr  nd_opt_pi_prefix;
};

#define ND_OPT_PI_FLAG_ONLINK 0x80
#define ND_OPT_PI_FLAG_AUTO   0x40
#define ND_OPT_PI_FLAG_RADDR  0x20

struct nd_opt_rd_hdr          /* redirected header */
{
  uint8_t   nd_opt_rh_type;
  uint8_t   nd_opt_rh_len;
  uint16_t  nd_opt_rh_reserved1;
  uint32_t  nd_opt_rh_reserved2;

  /* followed by IP header and data */
};

struct nd_opt_mtu             /* MTU option */
{
  uint8_t   nd_opt_mtu_type;
  uint8_t   nd_opt_mtu_len;
  uint16_t  nd_opt_mtu_reserved;
  uint32_t  nd_opt_mtu_mtu;
};

struct mld_hdr
{
  struct icmp6_hdr    mld_icmp6_hdr;
  struct in6_addr     mld_addr; /* multicast address */
};

#define mld_type        mld_icmp6_hdr.icmp6_type
#define mld_code        mld_icmp6_hdr.icmp6_code
#define mld_cksum       mld_icmp6_hdr.icmp6_cksum
#define mld_maxdelay    mld_icmp6_hdr.icmp6_data16[0]
#define mld_reserved    mld_icmp6_hdr.icmp6_data16[1]

#define ICMP6_ROUTER_RENUMBERING    138

struct icmp6_router_renum    /* router renumbering header */
{
  struct icmp6_hdr    rr_hdr;
  uint8_t             rr_segnum;
  uint8_t             rr_flags;
  uint16_t            rr_maxdelay;
  uint32_t            rr_reserved;
};

#define rr_type         rr_hdr.icmp6_type
#define rr_code         rr_hdr.icmp6_code
#define rr_cksum        rr_hdr.icmp6_cksum
#define rr_seqnum       rr_hdr.icmp6_data32[0]

/* Router renumbering flags */
#define ICMP6_RR_FLAGS_TEST             0x80
#define ICMP6_RR_FLAGS_REQRESULT        0x40
#define ICMP6_RR_FLAGS_FORCEAPPLY       0x20
#define ICMP6_RR_FLAGS_SPECSITE         0x10
#define ICMP6_RR_FLAGS_PREVDONE         0x08

struct rr_pco_match    /* match prefix part */
{
  uint8_t             rpm_code;
  uint8_t             rpm_len;
  uint8_t             rpm_ordinal;
  uint8_t             rpm_matchlen;
  uint8_t             rpm_minlen;
  uint8_t             rpm_maxlen;
  uint16_t            rpm_reserved;
  struct in6_addr     rpm_prefix;
};

/* PCO code values */
#define RPM_PCO_ADD             1
#define RPM_PCO_CHANGE          2
#define RPM_PCO_SETGLOBAL       3

struct rr_pco_use      /* use prefix part */
{
  uint8_t             rpu_uselen;
  uint8_t             rpu_keeplen;
  uint8_t             rpu_ramask;
  uint8_t             rpu_raflags;
  uint32_t            rpu_vltime;
  uint32_t            rpu_pltime;
  uint32_t            rpu_flags;
  struct in6_addr     rpu_prefix;
};

#define ICMP6_RR_PCOUSE_RAFLAGS_ONLINK  0x20
#define ICMP6_RR_PCOUSE_RAFLAGS_AUTO    0x10

#if __BYTE_ORDER == __BIG_ENDIAN
#  define ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME 0x80000000
#  define ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME 0x40000000
#elif __BYTE_ORDER == __LITTLE_ENDIAN
#  define ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME 0x80
#  define ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME 0x40
#endif

struct rr_result       /* router renumbering result message */
{
  uint16_t            rrr_flags;
  uint8_t             rrr_ordinal;
  uint8_t             rrr_matchedlen;
  uint32_t            rrr_ifid;
  struct in6_addr     rrr_prefix;
};

#if __BYTE_ORDER == __BIG_ENDIAN
#  define ICMP6_RR_RESULT_FLAGS_OOB       0x0002
#  define ICMP6_RR_RESULT_FLAGS_FORBIDDEN 0x0001
#elif __BYTE_ORDER == __LITTLE_ENDIAN
#  define ICMP6_RR_RESULT_FLAGS_OOB       0x0200
#  define ICMP6_RR_RESULT_FLAGS_FORBIDDEN 0x0100
#endif

/* Mobile IPv6 extension: Advertisement Interval.  */

struct nd_opt_adv_interval
{
  uint8_t   nd_opt_adv_interval_type;
  uint8_t   nd_opt_adv_interval_len;
  uint16_t  nd_opt_adv_interval_reserved;
  uint32_t  nd_opt_adv_interval_ival;
};

/* Mobile IPv6 extension: Home Agent Info.  */

struct nd_opt_home_agent_info
{
  uint8_t   nd_opt_home_agent_info_type;
  uint8_t   nd_opt_home_agent_info_len;
  uint16_t  nd_opt_home_agent_info_reserved;
  uint16_t  nd_opt_home_agent_info_preference;
  uint16_t  nd_opt_home_agent_info_lifetime;
};

#endif /* __INCLUDE_NETINET_ICMP6_H */