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. */