1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 #ifndef _UAPI_IPV6_H
3 #define _UAPI_IPV6_H
4 
5 #include <linux/libc-compat.h>
6 #include <linux/types.h>
7 #include <linux/stddef.h>
8 #include <linux/in6.h>
9 #include <asm/byteorder.h>
10 
11 /* The latest drafts declared increase in minimal mtu up to 1280. */
12 
13 #define IPV6_MIN_MTU	1280
14 
15 /*
16  *	Advanced API
17  *	source interface/address selection, source routing, etc...
18  *	*under construction*
19  */
20 
21 #if __UAPI_DEF_IN6_PKTINFO
22 struct in6_pktinfo {
23 	struct in6_addr	ipi6_addr;
24 	int		ipi6_ifindex;
25 };
26 #endif
27 
28 #if __UAPI_DEF_IP6_MTUINFO
29 struct ip6_mtuinfo {
30 	struct sockaddr_in6	ip6m_addr;
31 	__u32			ip6m_mtu;
32 };
33 #endif
34 
35 struct in6_ifreq {
36 	struct in6_addr	ifr6_addr;
37 	__u32		ifr6_prefixlen;
38 	int		ifr6_ifindex;
39 };
40 
41 #define IPV6_SRCRT_STRICT	0x01	/* Deprecated; will be removed */
42 #define IPV6_SRCRT_TYPE_0	0	/* Deprecated; will be removed */
43 #define IPV6_SRCRT_TYPE_2	2	/* IPv6 type 2 Routing Header	*/
44 #define IPV6_SRCRT_TYPE_3	3	/* RPL Segment Routing with IPv6 */
45 #define IPV6_SRCRT_TYPE_4	4	/* Segment Routing with IPv6 */
46 
47 /*
48  *	routing header
49  */
50 struct ipv6_rt_hdr {
51 	__u8		nexthdr;
52 	__u8		hdrlen;
53 	__u8		type;
54 	__u8		segments_left;
55 
56 	/*
57 	 *	type specific data
58 	 *	variable length field
59 	 */
60 };
61 
62 
63 struct ipv6_opt_hdr {
64 	__u8 		nexthdr;
65 	__u8 		hdrlen;
66 	/*
67 	 * TLV encoded option data follows.
68 	 */
69 } __attribute__((packed));	/* required for some archs */
70 
71 #define ipv6_destopt_hdr ipv6_opt_hdr
72 #define ipv6_hopopt_hdr  ipv6_opt_hdr
73 
74 /* Router Alert option values (RFC2711) */
75 #define IPV6_OPT_ROUTERALERT_MLD	0x0000	/* MLD(RFC2710) */
76 
77 /*
78  *	routing header type 0 (used in cmsghdr struct)
79  */
80 
81 struct rt0_hdr {
82 	struct ipv6_rt_hdr	rt_hdr;
83 	__u32			reserved;
84 	struct in6_addr		addr[0];
85 
86 #define rt0_type		rt_hdr.type
87 };
88 
89 /*
90  *	routing header type 2
91  */
92 
93 struct rt2_hdr {
94 	struct ipv6_rt_hdr	rt_hdr;
95 	__u32			reserved;
96 	struct in6_addr		addr;
97 
98 #define rt2_type		rt_hdr.type
99 };
100 
101 /*
102  *	home address option in destination options header
103  */
104 
105 struct ipv6_destopt_hao {
106 	__u8			type;
107 	__u8			length;
108 	struct in6_addr		addr;
109 } __attribute__((packed));
110 
111 /*
112  *	IPv6 fixed header
113  *
114  *	BEWARE, it is incorrect. The first 4 bits of flow_lbl
115  *	are glued to priority now, forming "class".
116  */
117 
118 struct ipv6hdr {
119 #if defined(__LITTLE_ENDIAN_BITFIELD)
120 	__u8			priority:4,
121 				version:4;
122 #elif defined(__BIG_ENDIAN_BITFIELD)
123 	__u8			version:4,
124 				priority:4;
125 #else
126 #error	"Please fix <asm/byteorder.h>"
127 #endif
128 	__u8			flow_lbl[3];
129 
130 	__be16			payload_len;
131 	__u8			nexthdr;
132 	__u8			hop_limit;
133 
134 	__struct_group(/* no tag */, addrs, /* no attrs */,
135 		struct	in6_addr	saddr;
136 		struct	in6_addr	daddr;
137 	);
138 };
139 
140 
141 /* index values for the variables in ipv6_devconf */
142 enum {
143 	DEVCONF_FORWARDING = 0,
144 	DEVCONF_HOPLIMIT,
145 	DEVCONF_MTU6,
146 	DEVCONF_ACCEPT_RA,
147 	DEVCONF_ACCEPT_REDIRECTS,
148 	DEVCONF_AUTOCONF,
149 	DEVCONF_DAD_TRANSMITS,
150 	DEVCONF_RTR_SOLICITS,
151 	DEVCONF_RTR_SOLICIT_INTERVAL,
152 	DEVCONF_RTR_SOLICIT_DELAY,
153 	DEVCONF_USE_TEMPADDR,
154 	DEVCONF_TEMP_VALID_LFT,
155 	DEVCONF_TEMP_PREFERED_LFT,
156 	DEVCONF_REGEN_MAX_RETRY,
157 	DEVCONF_MAX_DESYNC_FACTOR,
158 	DEVCONF_MAX_ADDRESSES,
159 	DEVCONF_FORCE_MLD_VERSION,
160 	DEVCONF_ACCEPT_RA_DEFRTR,
161 	DEVCONF_ACCEPT_RA_PINFO,
162 	DEVCONF_ACCEPT_RA_RTR_PREF,
163 	DEVCONF_RTR_PROBE_INTERVAL,
164 	DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
165 	DEVCONF_PROXY_NDP,
166 	DEVCONF_OPTIMISTIC_DAD,
167 	DEVCONF_ACCEPT_SOURCE_ROUTE,
168 	DEVCONF_MC_FORWARDING,
169 	DEVCONF_DISABLE_IPV6,
170 	DEVCONF_ACCEPT_DAD,
171 	DEVCONF_FORCE_TLLAO,
172 	DEVCONF_NDISC_NOTIFY,
173 	DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL,
174 	DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL,
175 	DEVCONF_SUPPRESS_FRAG_NDISC,
176 	DEVCONF_ACCEPT_RA_FROM_LOCAL,
177 	DEVCONF_USE_OPTIMISTIC,
178 	DEVCONF_ACCEPT_RA_MTU,
179 	DEVCONF_STABLE_SECRET,
180 	DEVCONF_USE_OIF_ADDRS_ONLY,
181 	DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT,
182 	DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN,
183 	DEVCONF_DROP_UNICAST_IN_L2_MULTICAST,
184 	DEVCONF_DROP_UNSOLICITED_NA,
185 	DEVCONF_KEEP_ADDR_ON_DOWN,
186 	DEVCONF_RTR_SOLICIT_MAX_INTERVAL,
187 	DEVCONF_SEG6_ENABLED,
188 	DEVCONF_SEG6_REQUIRE_HMAC,
189 	DEVCONF_ENHANCED_DAD,
190 	DEVCONF_ADDR_GEN_MODE,
191 	DEVCONF_DISABLE_POLICY,
192 	DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN,
193 	DEVCONF_NDISC_TCLASS,
194 	DEVCONF_RPL_SEG_ENABLED,
195 	DEVCONF_RA_DEFRTR_METRIC,
196 	DEVCONF_IOAM6_ENABLED,
197 	DEVCONF_IOAM6_ID,
198 	DEVCONF_IOAM6_ID_WIDE,
199 	DEVCONF_NDISC_EVICT_NOCARRIER,
200 	DEVCONF_ACCEPT_UNTRACKED_NA,
201 	DEVCONF_MAX
202 };
203 
204 
205 #endif /* _UAPI_IPV6_H */
206