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 _UAPI_LINUX_IN6_H
23 #define _UAPI_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
33 struct 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
50 struct 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
60 struct 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 
71 struct 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_JUMBO		194
149 #define IPV6_TLV_HAO		201	/* home address option */
150 
151 /*
152  *	IPV6 socket options
153  */
154 #if __UAPI_DEF_IPV6_OPTIONS
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 #define IPV6_ADD_MEMBERSHIP	20
172 #define IPV6_DROP_MEMBERSHIP	21
173 #define IPV6_ROUTER_ALERT	22
174 #define IPV6_MTU_DISCOVER	23
175 #define IPV6_MTU		24
176 #define IPV6_RECVERR		25
177 #define IPV6_V6ONLY		26
178 #define IPV6_JOIN_ANYCAST	27
179 #define IPV6_LEAVE_ANYCAST	28
180 
181 /* IPV6_MTU_DISCOVER values */
182 #define IPV6_PMTUDISC_DONT		0
183 #define IPV6_PMTUDISC_WANT		1
184 #define IPV6_PMTUDISC_DO		2
185 #define IPV6_PMTUDISC_PROBE		3
186 /* same as IPV6_PMTUDISC_PROBE, provided for symetry with IPv4
187  * also see comments on IP_PMTUDISC_INTERFACE
188  */
189 #define IPV6_PMTUDISC_INTERFACE		4
190 /* weaker version of IPV6_PMTUDISC_INTERFACE, which allows packets to
191  * get fragmented if they exceed the interface mtu
192  */
193 #define IPV6_PMTUDISC_OMIT		5
194 
195 /* Flowlabel */
196 #define IPV6_FLOWLABEL_MGR	32
197 #define IPV6_FLOWINFO_SEND	33
198 
199 #define IPV6_IPSEC_POLICY	34
200 #define IPV6_XFRM_POLICY	35
201 #define IPV6_HDRINCL		36
202 #endif
203 
204 /*
205  * Multicast:
206  * Following socket options are shared between IPv4 and IPv6.
207  *
208  * MCAST_JOIN_GROUP		42
209  * MCAST_BLOCK_SOURCE		43
210  * MCAST_UNBLOCK_SOURCE		44
211  * MCAST_LEAVE_GROUP		45
212  * MCAST_JOIN_SOURCE_GROUP	46
213  * MCAST_LEAVE_SOURCE_GROUP	47
214  * MCAST_MSFILTER		48
215  */
216 
217 /*
218  * Advanced API (RFC3542) (1)
219  *
220  * Note: IPV6_RECVRTHDRDSTOPTS does not exist. see net/ipv6/datagram.c.
221  */
222 
223 #define IPV6_RECVPKTINFO	49
224 #define IPV6_PKTINFO		50
225 #define IPV6_RECVHOPLIMIT	51
226 #define IPV6_HOPLIMIT		52
227 #define IPV6_RECVHOPOPTS	53
228 #define IPV6_HOPOPTS		54
229 #define IPV6_RTHDRDSTOPTS	55
230 #define IPV6_RECVRTHDR		56
231 #define IPV6_RTHDR		57
232 #define IPV6_RECVDSTOPTS	58
233 #define IPV6_DSTOPTS		59
234 #define IPV6_RECVPATHMTU	60
235 #define IPV6_PATHMTU		61
236 #define IPV6_DONTFRAG		62
237 #if 0	/* not yet */
238 #define IPV6_USE_MIN_MTU	63
239 #endif
240 
241 /*
242  * Netfilter (1)
243  *
244  * Following socket options are used in ip6_tables;
245  * see include/linux/netfilter_ipv6/ip6_tables.h.
246  *
247  * IP6T_SO_SET_REPLACE / IP6T_SO_GET_INFO		64
248  * IP6T_SO_SET_ADD_COUNTERS / IP6T_SO_GET_ENTRIES	65
249  */
250 
251 /*
252  * Advanced API (RFC3542) (2)
253  */
254 #define IPV6_RECVTCLASS		66
255 #define IPV6_TCLASS		67
256 
257 /*
258  * Netfilter (2)
259  *
260  * Following socket options are used in ip6_tables;
261  * see include/linux/netfilter_ipv6/ip6_tables.h.
262  *
263  * IP6T_SO_GET_REVISION_MATCH	68
264  * IP6T_SO_GET_REVISION_TARGET	69
265  * IP6T_SO_ORIGINAL_DST		80
266  */
267 
268 #define IPV6_AUTOFLOWLABEL	70
269 /* RFC5014: Source address selection */
270 #define IPV6_ADDR_PREFERENCES	72
271 
272 #define IPV6_PREFER_SRC_TMP		0x0001
273 #define IPV6_PREFER_SRC_PUBLIC		0x0002
274 #define IPV6_PREFER_SRC_PUBTMP_DEFAULT	0x0100
275 #define IPV6_PREFER_SRC_COA		0x0004
276 #define IPV6_PREFER_SRC_HOME		0x0400
277 #define IPV6_PREFER_SRC_CGA		0x0008
278 #define IPV6_PREFER_SRC_NONCGA		0x0800
279 
280 /* RFC5082: Generalized Ttl Security Mechanism */
281 #define IPV6_MINHOPCOUNT		73
282 
283 #define IPV6_ORIGDSTADDR        74
284 #define IPV6_RECVORIGDSTADDR    IPV6_ORIGDSTADDR
285 #define IPV6_TRANSPARENT        75
286 #define IPV6_UNICAST_IF         76
287 #define IPV6_RECVFRAGSIZE	77
288 #define IPV6_FREEBIND		78
289 
290 /*
291  * Multicast Routing:
292  * see include/uapi/linux/mroute6.h.
293  *
294  * MRT6_BASE			200
295  * ...
296  * MRT6_MAX
297  */
298 #endif /* _UAPI_LINUX_IN6_H */
299