bits/in.h

   1 /* Copyright (C) 1997-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 /* Generic version.  */
  19
  20 #ifndef _NETINET_IN_H
  21 # error "Never use <bits/in.h> directly; include <netinet/in.h> instead."
  22 #endif
  23
  24 /* This is the generic version, do not assume a linux-based kernel.  */
  25 #define __USE_KERNEL_IPV6_DEFS 0
  26
  27 /* To select the IP level.  */
  28 #define SOL_IP          0
  29
  30 /* Options for use with `getsockopt' and `setsockopt' at the IP level.
  31    The first word in the comment at the right is the data type used;
  32    "bool" means a boolean value stored in an `int'.  */
  33 #define IP_OPTIONS      1       /* ip_opts; IP per-packet options.  */
  34 #define IP_HDRINCL      2       /* int; Header is included with data.  */
  35 #define IP_TOS          3       /* int; IP type of service and precedence.  */
  36 #define IP_TTL          4       /* int; IP time to live.  */
  37 #define IP_RECVOPTS     5       /* bool; Receive all IP options w/datagram.  */
  38 #define IP_RECVRETOPTS  6       /* bool; Receive IP options for response.  */
  39 #define IP_RECVDSTADDR  7       /* bool; Receive IP dst addr w/datagram.  */
  40 #define IP_RETOPTS      8       /* ip_opts; Set/get IP per-packet options.  */
  41 #define IP_MULTICAST_IF 9       /* in_addr; set/get IP multicast i/f */
  42 #define IP_MULTICAST_TTL 10     /* unsigned char; set/get IP multicast ttl */
  43 #define IP_MULTICAST_LOOP 11    /* bool; set/get IP multicast loopback */
  44 #define IP_ADD_MEMBERSHIP 12    /* ip_mreq; add an IP group membership */
  45 #define IP_DROP_MEMBERSHIP 13   /* ip_mreq; drop an IP group membership */
  46
  47 /* IP_MTU_DISCOVER arguments.  */
  48 #define IP_PMTUDISC_DONT   0    /* Never send DF frames.  */
  49 #define IP_PMTUDISC_WANT   1    /* Use per route hints.  */
  50 #define IP_PMTUDISC_DO     2    /* Always DF.  */
  51 #define IP_PMTUDISC_PROBE  3    /* Ignore dst pmtu.  */
  52 /* Always use interface mtu (ignores dst pmtu) but don't set DF flag.
  53    Also incoming ICMP frag_needed notifications will be ignored on
  54    this socket to prevent accepting spoofed ones.  */
  55 #define IP_PMTUDISC_INTERFACE           4
  56 /* Like IP_PMTUDISC_INTERFACE but allow packets to be fragmented.  */
  57 #define IP_PMTUDISC_OMIT                5
  58
  59 #ifdef __USE_MISC
  60 /* Structure used to describe IP options for IP_OPTIONS and IP_RETOPTS.
  61    The `ip_dst' field is used for the first-hop gateway when using a
  62    source route (this gets put into the header proper).  */
  63 struct ip_opts
  64   {
  65     struct in_addr ip_dst;      /* First hop; zero without source route.  */
  66     char ip_opts[40];           /* Actually variable in size.  */
  67   };
  68 #endif
  69
  70 /* Socket-level values for IPv6.  */
  71 #define SOL_IPV6                41
  72 #define SOL_ICMPV6              58
  73
  74 /* IPV6 socket options.  */
  75 #define IPV6_ADDRFORM           1
  76 #define IPV6_2292PKTINFO        2
  77 #define IPV6_2292HOPOPTS        3
  78 #define IPV6_2292DSTOPTS        4
  79 #define IPV6_2292RTHDR          5
  80 #define IPV6_2292PKTOPTIONS     6
  81 #define IPV6_CHECKSUM           7
  82 #define IPV6_2292HOPLIMIT       8
  83
  84 #define IPV6_RXINFO             IPV6_2292PKTINFO
  85 #define IPV6_TXINFO             IPV6_RXINFO
  86 #define SCM_SRCINFO             IPV6_TXINFO
  87 #define SCM_SRCRT               IPV6_RXSRCRT
  88
  89 #define IPV6_UNICAST_HOPS       16
  90 #define IPV6_MULTICAST_IF       17
  91 #define IPV6_MULTICAST_HOPS     18
  92 #define IPV6_MULTICAST_LOOP     19
  93 #define IPV6_JOIN_GROUP         20
  94 #define IPV6_LEAVE_GROUP        21
  95 #define IPV6_ROUTER_ALERT      22
  96 #define IPV6_MTU_DISCOVER      23
  97 #define IPV6_MTU               24
  98 #define IPV6_RECVERR           25
  99 #define IPV6_V6ONLY            26
 100 #define IPV6_JOIN_ANYCAST      27
 101 #define IPV6_LEAVE_ANYCAST     28
 102
 103 /* IPV6_MTU_DISCOVER values.  */
 104 #define IPV6_PMTUDISC_DONT      0       /* Never send DF frames.  */
 105 #define IPV6_PMTUDISC_WANT      1       /* Use per route hints.  */
 106 #define IPV6_PMTUDISC_DO        2       /* Always DF.  */
 107 #define IPV6_PMTUDISC_PROBE     3       /* Ignore dst pmtu.  */
 108 #define IPV6_PMTUDISC_INTERFACE 4       /* See IP_PMTUDISC_INTERFACE.  */
 109 #define IPV6_PMTUDISC_OMIT      5       /* See IP_PMTUDISC_OMIT.  */
 110
 111 /* Advanced API (RFC3542) (1).  */
 112 #define IPV6_RECVPKTINFO        49
 113 #define IPV6_PKTINFO            50
 114 #define IPV6_RECVHOPLIMIT       51
 115 #define IPV6_HOPLIMIT           52
 116 #define IPV6_RECVHOPOPTS        53
 117 #define IPV6_HOPOPTS            54
 118 #define IPV6_RTHDRDSTOPTS       55
 119 #define IPV6_RECVRTHDR          56
 120 #define IPV6_RTHDR              57
 121 #define IPV6_RECVDSTOPTS        58
 122 #define IPV6_DSTOPTS            59
 123 #define IPV6_RECVPATHMTU        60
 124 #define IPV6_PATHMTU            61
 125 #define IPV6_DONTFRAG           62
 126
 127 /* Advanced API (RFC3542) (2).  */
 128 #define IPV6_RECVTCLASS         66
 129 #define IPV6_TCLASS             67
 130
 131 /* RFC5014.  */
 132 #define IPV6_ADDR_PREFERENCES   72
 133
 134 /* RFC5082.  */
 135 #define IPV6_MINHOPCOUNT        73
 136
 137 /* Obsolete synonyms for the above.  */
 138 #define IPV6_ADD_MEMBERSHIP     IPV6_JOIN_GROUP
 139 #define IPV6_DROP_MEMBERSHIP    IPV6_LEAVE_GROUP
 140 #define IPV6_RXHOPOPTS          IPV6_2292HOPOPTS
 141 #define IPV6_RXDSTOPTS          IPV6_2292DSTOPTS
 142
 143 /* Routing header options for IPv6.  */
 144 #define IPV6_RTHDR_LOOSE        0       /* Hop doesn't need to be neighbour. */
 145 #define IPV6_RTHDR_STRICT       1       /* Hop must be a neighbour.  */
 146
 147 #define IPV6_RTHDR_TYPE_0       0       /* IPv6 Routing header type 0.  */