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1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2/*
3 * Types and definitions for AF_INET6
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 *
9 * Sources:
10 * IPv6 Program Interfaces for BSD Systems
11 * <draft-ietf-ipngwg-bsd-api-05.txt>
12 *
13 * Advanced Sockets API for IPv6
14 * <draft-stevens-advanced-api-00.txt>
15 *
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License
18 * as published by the Free Software Foundation; either version
19 * 2 of the License, or (at your option) any later version.
20 */
21
22#ifndef _LINUX_IN6_H
23#define _LINUX_IN6_H
24
25#include <linux/types.h>
26#include <linux/libc-compat.h>
27
28/*
29 * IPv6 address structure
30 */
31
32#if __UAPI_DEF_IN6_ADDR
33struct in6_addr {
34 union {
35 __u8 u6_addr8[16];
36#if __UAPI_DEF_IN6_ADDR_ALT
37 __be16 u6_addr16[8];
38 __be32 u6_addr32[4];
39#endif
40 } in6_u;
41#define s6_addr in6_u.u6_addr8
42#if __UAPI_DEF_IN6_ADDR_ALT
43#define s6_addr16 in6_u.u6_addr16
44#define s6_addr32 in6_u.u6_addr32
45#endif
46};
47#endif /* __UAPI_DEF_IN6_ADDR */
48
49#if __UAPI_DEF_SOCKADDR_IN6
50struct sockaddr_in6 {
51 unsigned short int sin6_family; /* AF_INET6 */
52 __be16 sin6_port; /* Transport layer port # */
53 __be32 sin6_flowinfo; /* IPv6 flow information */
54 struct in6_addr sin6_addr; /* IPv6 address */
55 __u32 sin6_scope_id; /* scope id (new in RFC2553) */
56};
57#endif /* __UAPI_DEF_SOCKADDR_IN6 */
58
59#if __UAPI_DEF_IPV6_MREQ
60struct ipv6_mreq {
61 /* IPv6 multicast address of group */
62 struct in6_addr ipv6mr_multiaddr;
63
64 /* local IPv6 address of interface */
65 int ipv6mr_ifindex;
66};
67#endif /* __UAPI_DEF_IVP6_MREQ */
68
69#define ipv6mr_acaddr ipv6mr_multiaddr
70
71struct in6_flowlabel_req {
72 struct in6_addr flr_dst;
73 __be32 flr_label;
74 __u8 flr_action;
75 __u8 flr_share;
76 __u16 flr_flags;
77 __u16 flr_expires;
78 __u16 flr_linger;
79 __u32 __flr_pad;
80 /* Options in format of IPV6_PKTOPTIONS */
81};
82
83#define IPV6_FL_A_GET 0
84#define IPV6_FL_A_PUT 1
85#define IPV6_FL_A_RENEW 2
86
87#define IPV6_FL_F_CREATE 1
88#define IPV6_FL_F_EXCL 2
89#define IPV6_FL_F_REFLECT 4
90#define IPV6_FL_F_REMOTE 8
91
92#define IPV6_FL_S_NONE 0
93#define IPV6_FL_S_EXCL 1
94#define IPV6_FL_S_PROCESS 2
95#define IPV6_FL_S_USER 3
96#define IPV6_FL_S_ANY 255
97
98
99/*
100 * Bitmask constant declarations to help applications select out the
101 * flow label and priority fields.
102 *
103 * Note that this are in host byte order while the flowinfo field of
104 * sockaddr_in6 is in network byte order.
105 */
106
107#define IPV6_FLOWINFO_FLOWLABEL 0x000fffff
108#define IPV6_FLOWINFO_PRIORITY 0x0ff00000
109
110/* These definitions are obsolete */
111#define IPV6_PRIORITY_UNCHARACTERIZED 0x0000
112#define IPV6_PRIORITY_FILLER 0x0100
113#define IPV6_PRIORITY_UNATTENDED 0x0200
114#define IPV6_PRIORITY_RESERVED1 0x0300
115#define IPV6_PRIORITY_BULK 0x0400
116#define IPV6_PRIORITY_RESERVED2 0x0500
117#define IPV6_PRIORITY_INTERACTIVE 0x0600
118#define IPV6_PRIORITY_CONTROL 0x0700
119#define IPV6_PRIORITY_8 0x0800
120#define IPV6_PRIORITY_9 0x0900
121#define IPV6_PRIORITY_10 0x0a00
122#define IPV6_PRIORITY_11 0x0b00
123#define IPV6_PRIORITY_12 0x0c00
124#define IPV6_PRIORITY_13 0x0d00
125#define IPV6_PRIORITY_14 0x0e00
126#define IPV6_PRIORITY_15 0x0f00
127
128/*
129 * IPV6 extension headers
130 */
131#if __UAPI_DEF_IPPROTO_V6
132#define IPPROTO_HOPOPTS 0 /* IPv6 hop-by-hop options */
133#define IPPROTO_ROUTING 43 /* IPv6 routing header */
134#define IPPROTO_FRAGMENT 44 /* IPv6 fragmentation header */
135#define IPPROTO_ICMPV6 58 /* ICMPv6 */
136#define IPPROTO_NONE 59 /* IPv6 no next header */
137#define IPPROTO_DSTOPTS 60 /* IPv6 destination options */
138#define IPPROTO_MH 135 /* IPv6 mobility header */
139#endif /* __UAPI_DEF_IPPROTO_V6 */
140
141/*
142 * IPv6 TLV options.
143 */
144#define IPV6_TLV_PAD1 0
145#define IPV6_TLV_PADN 1
146#define IPV6_TLV_ROUTERALERT 5
147#define IPV6_TLV_CALIPSO 7 /* RFC 5570 */
148#define IPV6_TLV_IOAM 49 /* RFC 9486 */
149#define IPV6_TLV_JUMBO 194
150#define IPV6_TLV_HAO 201 /* home address option */
151
152/*
153 * IPV6 socket options
154 */
155#define IPV6_ADDRFORM 1
156#define IPV6_2292PKTINFO 2
157#define IPV6_2292HOPOPTS 3
158#define IPV6_2292DSTOPTS 4
159#define IPV6_2292RTHDR 5
160#define IPV6_2292PKTOPTIONS 6
161#define IPV6_CHECKSUM 7
162#define IPV6_2292HOPLIMIT 8
163#define IPV6_NEXTHOP 9
164#define IPV6_AUTHHDR 10 /* obsolete */
165#define IPV6_FLOWINFO 11
166
167#define IPV6_UNICAST_HOPS 16
168#define IPV6_MULTICAST_IF 17
169#define IPV6_MULTICAST_HOPS 18
170#define IPV6_MULTICAST_LOOP 19
171#if __UAPI_DEF_IPV6_OPTIONS
172#define IPV6_ADD_MEMBERSHIP 20
173#define IPV6_DROP_MEMBERSHIP 21
174#endif
175#define IPV6_ROUTER_ALERT 22
176#define IPV6_MTU_DISCOVER 23
177#define IPV6_MTU 24
178#define IPV6_RECVERR 25
179#define IPV6_V6ONLY 26
180#define IPV6_JOIN_ANYCAST 27
181#define IPV6_LEAVE_ANYCAST 28
182#define IPV6_MULTICAST_ALL 29
183#define IPV6_ROUTER_ALERT_ISOLATE 30
184#define IPV6_RECVERR_RFC4884 31
185
186/* IPV6_MTU_DISCOVER values */
187#define IPV6_PMTUDISC_DONT 0
188#define IPV6_PMTUDISC_WANT 1
189#define IPV6_PMTUDISC_DO 2
190#define IPV6_PMTUDISC_PROBE 3
191/* same as IPV6_PMTUDISC_PROBE, provided for symetry with IPv4
192 * also see comments on IP_PMTUDISC_INTERFACE
193 */
194#define IPV6_PMTUDISC_INTERFACE 4
195/* weaker version of IPV6_PMTUDISC_INTERFACE, which allows packets to
196 * get fragmented if they exceed the interface mtu
197 */
198#define IPV6_PMTUDISC_OMIT 5
199
200/* Flowlabel */
201#define IPV6_FLOWLABEL_MGR 32
202#define IPV6_FLOWINFO_SEND 33
203
204#define IPV6_IPSEC_POLICY 34
205#define IPV6_XFRM_POLICY 35
206#define IPV6_HDRINCL 36
207
208/*
209 * Multicast:
210 * Following socket options are shared between IPv4 and IPv6.
211 *
212 * MCAST_JOIN_GROUP 42
213 * MCAST_BLOCK_SOURCE 43
214 * MCAST_UNBLOCK_SOURCE 44
215 * MCAST_LEAVE_GROUP 45
216 * MCAST_JOIN_SOURCE_GROUP 46
217 * MCAST_LEAVE_SOURCE_GROUP 47
218 * MCAST_MSFILTER 48
219 */
220
221/*
222 * Advanced API (RFC3542) (1)
223 *
224 * Note: IPV6_RECVRTHDRDSTOPTS does not exist. see net/ipv6/datagram.c.
225 */
226
227#define IPV6_RECVPKTINFO 49
228#define IPV6_PKTINFO 50
229#define IPV6_RECVHOPLIMIT 51
230#define IPV6_HOPLIMIT 52
231#define IPV6_RECVHOPOPTS 53
232#define IPV6_HOPOPTS 54
233#define IPV6_RTHDRDSTOPTS 55
234#define IPV6_RECVRTHDR 56
235#define IPV6_RTHDR 57
236#define IPV6_RECVDSTOPTS 58
237#define IPV6_DSTOPTS 59
238#define IPV6_RECVPATHMTU 60
239#define IPV6_PATHMTU 61
240#define IPV6_DONTFRAG 62
241#if 0 /* not yet */
242#define IPV6_USE_MIN_MTU 63
243#endif
244
245/*
246 * Netfilter (1)
247 *
248 * Following socket options are used in ip6_tables;
249 * see include/linux/netfilter_ipv6/ip6_tables.h.
250 *
251 * IP6T_SO_SET_REPLACE / IP6T_SO_GET_INFO 64
252 * IP6T_SO_SET_ADD_COUNTERS / IP6T_SO_GET_ENTRIES 65
253 */
254
255/*
256 * Advanced API (RFC3542) (2)
257 */
258#define IPV6_RECVTCLASS 66
259#define IPV6_TCLASS 67
260
261/*
262 * Netfilter (2)
263 *
264 * Following socket options are used in ip6_tables;
265 * see include/linux/netfilter_ipv6/ip6_tables.h.
266 *
267 * IP6T_SO_GET_REVISION_MATCH 68
268 * IP6T_SO_GET_REVISION_TARGET 69
269 * IP6T_SO_ORIGINAL_DST 80
270 */
271
272#define IPV6_AUTOFLOWLABEL 70
273/* RFC5014: Source address selection */
274#define IPV6_ADDR_PREFERENCES 72
275
276#define IPV6_PREFER_SRC_TMP 0x0001
277#define IPV6_PREFER_SRC_PUBLIC 0x0002
278#define IPV6_PREFER_SRC_PUBTMP_DEFAULT 0x0100
279#define IPV6_PREFER_SRC_COA 0x0004
280#define IPV6_PREFER_SRC_HOME 0x0400
281#define IPV6_PREFER_SRC_CGA 0x0008
282#define IPV6_PREFER_SRC_NONCGA 0x0800
283
284/* RFC5082: Generalized Ttl Security Mechanism */
285#define IPV6_MINHOPCOUNT 73
286
287#define IPV6_ORIGDSTADDR 74
288#define IPV6_RECVORIGDSTADDR IPV6_ORIGDSTADDR
289#define IPV6_TRANSPARENT 75
290#define IPV6_UNICAST_IF 76
291#define IPV6_RECVFRAGSIZE 77
292#define IPV6_FREEBIND 78
293
294/*
295 * Multicast Routing:
296 * see include/uapi/linux/mroute6.h.
297 *
298 * MRT6_BASE 200
299 * ...
300 * MRT6_MAX
301 */
302#endif /* _LINUX_IN6_H */