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in.h

/* Copyright (C) 1997, 2000, 2004, 2007 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.  */

/* Generic 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_OPTIONS  1     /* ip_opts; IP per-packet options.  */
#define     IP_HDRINCL  2     /* int; Header is included with data.  */
#define     IP_TOS            3     /* int; IP type of service and precedence.  */
#define     IP_TTL            4     /* int; IP time to live.  */
#define     IP_RECVOPTS 5     /* bool; Receive all IP options w/datagram.  */
#define     IP_RECVRETOPTS    6     /* bool; Receive IP options for response.  */
#define     IP_RECVDSTADDR    7     /* bool; Receive IP dst addr w/datagram.  */
#define     IP_RETOPTS  8     /* ip_opts; Set/get IP per-packet options.  */
#define IP_MULTICAST_IF 9     /* in_addr; set/get IP multicast i/f */
#define IP_MULTICAST_TTL 10   /* u_char; set/get IP multicast ttl */
#define IP_MULTICAST_LOOP 11  /* i_char; set/get IP multicast loopback */
#define IP_ADD_MEMBERSHIP 12  /* ip_mreq; add an IP group membership */
#define IP_DROP_MEMBERSHIP 13 /* ip_mreq; drop an IP group membership */

/* Structure used to describe IP options for IP_OPTIONS and IP_RETOPTS.
   The `ip_dst' field is used for the first-hop gateway when using a
   source route (this gets put into the header proper).  */
00045 struct ip_opts
  {
    struct in_addr ip_dst;    /* First hop; zero without source route.  */
    char ip_opts[40];         /* Actually variable in size.  */
  };

/* IPV6 socket options.  */
#define IPV6_ADDRFORM         1
#define IPV6_RXINFO           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_TXINFO           IPV6_RXINFO
#define SCM_SRCINFO           IPV6_TXINFO
#define SCM_SRCRT       IPV6_RXSRCRT

#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 IPV6_V6ONLY            26
#define IPV6_JOIN_ANYCAST      27
#define IPV6_LEAVE_ANYCAST     28

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

/* 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.  */

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