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/in6.h>
8 #include <asm/byteorder.h>
9 
10 /* The latest drafts declared increase in minimal mtu up to 1280. */
11 
12 #define IPV6_MIN_MTU	1280
13 
14 /*
15  *	Advanced API
16  *	source interface/address selection, source routing, etc...
17  *	*under construction*
18  */
19 
20 #if __UAPI_DEF_IN6_PKTINFO
21 struct in6_pktinfo {
22 	struct in6_addr	ipi6_addr;
23 	int		ipi6_ifindex;
24 };
25 #endif
26 
27 #if __UAPI_DEF_IP6_MTUINFO
28 struct ip6_mtuinfo {
29 	struct sockaddr_in6	ip6m_addr;
30 	__u32			ip6m_mtu;
31 };
32 #endif
33 
34 struct in6_ifreq {
35 	struct in6_addr	ifr6_addr;
36 	__u32		ifr6_prefixlen;
37 	int		ifr6_ifindex;
38 };
39 
40 #define IPV6_SRCRT_STRICT	0x01	/* Deprecated; will be removed */
41 #define IPV6_SRCRT_TYPE_0	0	/* Deprecated; will be removed */
42 #define IPV6_SRCRT_TYPE_2	2	/* IPv6 type 2 Routing Header	*/
43 #define IPV6_SRCRT_TYPE_3	3	/* RPL Segment Routing with IPv6 */
44 #define IPV6_SRCRT_TYPE_4	4	/* Segment Routing with IPv6 */
45 
46 /*
47  *	routing header
48  */
49 struct ipv6_rt_hdr {
50 	__u8		nexthdr;
51 	__u8		hdrlen;
52 	__u8		type;
53 	__u8		segments_left;
54 
55 	/*
56 	 *	type specific data
57 	 *	variable length field
58 	 */
59 };
60 
61 
62 struct ipv6_opt_hdr {
63 	__u8 		nexthdr;
64 	__u8 		hdrlen;
65 	/*
66 	 * TLV encoded option data follows.
67 	 */
68 } __attribute__((packed));	/* required for some archs */
69 
70 #define ipv6_destopt_hdr ipv6_opt_hdr
71 #define ipv6_hopopt_hdr  ipv6_opt_hdr
72 
73 /* Router Alert option values (RFC2711) */
74 #define IPV6_OPT_ROUTERALERT_MLD	0x0000	/* MLD(RFC2710) */
75 
76 /*
77  *	routing header type 0 (used in cmsghdr struct)
78  */
79 
80 struct rt0_hdr {
81 	struct ipv6_rt_hdr	rt_hdr;
82 	__u32			reserved;
83 	struct in6_addr		addr[0];
84 
85 #define rt0_type		rt_hdr.type
86 };
87 
88 /*
89  *	routing header type 2
90  */
91 
92 struct rt2_hdr {
93 	struct ipv6_rt_hdr	rt_hdr;
94 	__u32			reserved;
95 	struct in6_addr		addr;
96 
97 #define rt2_type		rt_hdr.type
98 };
99 
100 /*
101  *	home address option in destination options header
102  */
103 
104 struct ipv6_destopt_hao {
105 	__u8			type;
106 	__u8			length;
107 	struct in6_addr		addr;
108 } __attribute__((packed));
109 
110 /*
111  *	IPv6 fixed header
112  *
113  *	BEWARE, it is incorrect. The first 4 bits of flow_lbl
114  *	are glued to priority now, forming "class".
115  */
116 
117 struct ipv6hdr {
118 #if defined(__LITTLE_ENDIAN_BITFIELD)
119 	__u8			priority:4,
120 				version:4;
121 #elif defined(__BIG_ENDIAN_BITFIELD)
122 	__u8			version:4,
123 				priority:4;
124 #else
125 #error	"Please fix <asm/byteorder.h>"
126 #endif
127 	__u8			flow_lbl[3];
128 
129 	__be16			payload_len;
130 	__u8			nexthdr;
131 	__u8			hop_limit;
132 
133 	struct	in6_addr	saddr;
134 	struct	in6_addr	daddr;
135 };
136 
137 
138 /* index values for the variables in ipv6_devconf */
139 enum {
140 	DEVCONF_FORWARDING = 0,
141 	DEVCONF_HOPLIMIT,
142 	DEVCONF_MTU6,
143 	DEVCONF_ACCEPT_RA,
144 	DEVCONF_ACCEPT_REDIRECTS,
145 	DEVCONF_AUTOCONF,
146 	DEVCONF_DAD_TRANSMITS,
147 	DEVCONF_RTR_SOLICITS,
148 	DEVCONF_RTR_SOLICIT_INTERVAL,
149 	DEVCONF_RTR_SOLICIT_DELAY,
150 	DEVCONF_USE_TEMPADDR,
151 	DEVCONF_TEMP_VALID_LFT,
152 	DEVCONF_TEMP_PREFERED_LFT,
153 	DEVCONF_REGEN_MAX_RETRY,
154 	DEVCONF_MAX_DESYNC_FACTOR,
155 	DEVCONF_MAX_ADDRESSES,
156 	DEVCONF_FORCE_MLD_VERSION,
157 	DEVCONF_ACCEPT_RA_DEFRTR,
158 	DEVCONF_ACCEPT_RA_PINFO,
159 	DEVCONF_ACCEPT_RA_RTR_PREF,
160 	DEVCONF_RTR_PROBE_INTERVAL,
161 	DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
162 	DEVCONF_PROXY_NDP,
163 	DEVCONF_OPTIMISTIC_DAD,
164 	DEVCONF_ACCEPT_SOURCE_ROUTE,
165 	DEVCONF_MC_FORWARDING,
166 	DEVCONF_DISABLE_IPV6,
167 	DEVCONF_ACCEPT_DAD,
168 	DEVCONF_FORCE_TLLAO,
169 	DEVCONF_NDISC_NOTIFY,
170 	DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL,
171 	DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL,
172 	DEVCONF_SUPPRESS_FRAG_NDISC,
173 	DEVCONF_ACCEPT_RA_FROM_LOCAL,
174 	DEVCONF_USE_OPTIMISTIC,
175 	DEVCONF_ACCEPT_RA_MTU,
176 	DEVCONF_STABLE_SECRET,
177 	DEVCONF_USE_OIF_ADDRS_ONLY,
178 	DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT,
179 	DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN,
180 	DEVCONF_DROP_UNICAST_IN_L2_MULTICAST,
181 	DEVCONF_DROP_UNSOLICITED_NA,
182 	DEVCONF_KEEP_ADDR_ON_DOWN,
183 	DEVCONF_RTR_SOLICIT_MAX_INTERVAL,
184 	DEVCONF_SEG6_ENABLED,
185 	DEVCONF_SEG6_REQUIRE_HMAC,
186 	DEVCONF_ENHANCED_DAD,
187 	DEVCONF_ADDR_GEN_MODE,
188 	DEVCONF_DISABLE_POLICY,
189 	DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN,
190 	DEVCONF_NDISC_TCLASS,
191 	DEVCONF_RPL_SEG_ENABLED,
192 	DEVCONF_RA_DEFRTR_METRIC,
193 	DEVCONF_IOAM6_ENABLED,
194 	DEVCONF_IOAM6_ID,
195 	DEVCONF_IOAM6_ID_WIDE,
196 	DEVCONF_NDISC_EVICT_NOCARRIER,
197 	DEVCONF_MAX
198 };
199 
200 
201 #endif /* _UAPI_IPV6_H */
202