/* Copyright (C) 1991-1999, 2000 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

/* Linux version.  */

#ifndef _NETINET_IN_H
# error "Never use <bits/in.h> directly; include <netinet/in.h> instead."
#endif

/* Options for use with `getsockopt' and `setsockopt' at the IP level.
   The first word in the comment at the right is the data type used;
   "bool" means a boolean value stored in an `int'.  */
#define IP_TOS             1	/* int; IP type of service and precedence.  */
#define IP_TTL             2	/* int; IP time to live.  */
#define IP_HDRINCL         3	/* int; Header is included with data.  */
#define IP_OPTIONS         4	/* ip_opts; IP per-packet options.  */
#define IP_ROUTER_ALERT    5	/* bool */
#define IP_RECVOPTS        6	/* bool */
#define IP_RETOPTS         7	/* bool */
#define IP_PKTINFO         8	/* bool */
#define IP_PKTOPTIONS      9
#define IP_PMTUDISC        10	/* obsolete name? */
#define IP_MTU_DISCOVER    10	/* int; see below */
#define IP_RECVERR         11	/* bool */
#define IP_RECVTTL         12	/* bool */
#define IP_RECVTOS         13	/* bool */
#define IP_MULTICAST_IF    32	/* in_addr; set/get IP multicast i/f */
#define IP_MULTICAST_TTL   33	/* u_char; set/get IP multicast ttl */
#define IP_MULTICAST_LOOP  34	/* i_char; set/get IP multicast loopback */
#define IP_ADD_MEMBERSHIP  35	/* ip_mreq; add an IP group membership */
#define IP_DROP_MEMBERSHIP 36	/* ip_mreq; drop an IP group membership */

/* For BSD compatibility.  */
#define IP_RECVRETOPTS	IP_RETOPTS

/* IP_MTU_DISCOVER arguments.  */
#define IP_PMTUDISC_DONT   0	/* Never send DF frames.  */
#define IP_PMTUDISC_WANT   1	/* Use per route hints.  */
#define IP_PMTUDISC_DO     2	/* Always DF.  */

/* To select the IP level.  */
#define SOL_IP	0

#define IP_DEFAULT_MULTICAST_TTL        1
#define IP_DEFAULT_MULTICAST_LOOP       1
#define IP_MAX_MEMBERSHIPS              20

/* Structure used to describe IP options for IP_OPTIONS. The `ip_dst'
   field is used for the first-hop gateway when using a source route
   (this gets put into the header proper).  */
struct ip_opts
  {
    struct in_addr ip_dst;	/* First hop; zero without source route.  */
    char ip_opts[40];		/* Actually variable in size.  */
  };

/* Structure used for IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP. */
struct ip_mreq
  {
    struct in_addr imr_multiaddr;	/* IP multicast address of group */
    struct in_addr imr_interface;	/* local IP address of interface */
  };

/* As above but including interface specification by index.  */
struct ip_mreqn
  {
    struct in_addr imr_multiaddr;	/* IP multicast address of group */
    struct in_addr imr_address;		/* local IP address of interface */
    int	imr_ifindex;			/* Interface index */
  };

/* Structure used for IP_PKTINFO.  */
struct in_pktinfo
  {
    int ipi_ifindex;			/* Interface index  */
    struct in_addr ipi_spec_dst;	/* Routing destination address  */
    struct in_addr ipi_addr;		/* Header destination address  */
  };

/* Options for use with `getsockopt' and `setsockopt' at the IPv6 level.
   The first word in the comment at the right is the data type used;
   "bool" means a boolean value stored in an `int'.  */
#define IPV6_ADDRFORM		1
#define IPV6_PKTINFO		2
#define IPV6_HOPOPTS		3
#define IPV6_DSTOPTS		4
#define IPV6_RTHDR		5
#define IPV6_PKTOPTIONS		6
#define IPV6_CHECKSUM		7
#define IPV6_HOPLIMIT		8
#define IPV6_NEXTHOP		9
#define IPV6_AUTHHDR		10
#define IPV6_UNICAST_HOPS	16
#define IPV6_MULTICAST_IF	17
#define IPV6_MULTICAST_HOPS	18
#define IPV6_MULTICAST_LOOP	19
#define IPV6_JOIN_GROUP		20
#define IPV6_LEAVE_GROUP	21
#define IPV6_ROUTER_ALERT	22
#define IPV6_MTU_DISCOVER	23
#define IPV6_MTU		24
#define IPV6_RECVERR		25

#define SCM_SRCRT		IPV6_RXSRCRT

/* Obsolete synonyms for the above.  */
#define IPV6_RXHOPOPTS		IPV6_HOPOPTS
#define IPV6_RXDSTOPTS		IPV6_DSTOPTS
#define IPV6_ADD_MEMBERSHIP	IPV6_JOIN_GROUP
#define IPV6_DROP_MEMBERSHIP	IPV6_LEAVE_GROUP


/* IPV6_MTU_DISCOVER values.  */
#define IPV6_PMTUDISC_DONT	0	/* Never send DF frames.  */
#define IPV6_PMTUDISC_WANT	1	/* Use per route hints.  */
#define IPV6_PMTUDISC_DO	2	/* Always DF.  */

/* Socket level values for IPv6.  */
#define SOL_IPV6        41
#define SOL_ICMPV6      58

/* Routing header options for IPv6.  */
#define IPV6_RTHDR_LOOSE	0	/* Hop doesn't need to be neighbour. */
#define IPV6_RTHDR_STRICT	1	/* Hop must be a neighbour.  */

#define IPV6_RTHDR_TYPE_0	0	/* IPv6 Routing header type 0.  */