1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2#ifndef _IPV6_H
3#define _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
22struct in6_pktinfo {
23 struct in6_addr ipi6_addr;
24 int ipi6_ifindex;
25};
26#endif
27
28#if __UAPI_DEF_IP6_MTUINFO
29struct ip6_mtuinfo {
30 struct sockaddr_in6 ip6m_addr;
31 __u32 ip6m_mtu;
32};
33#endif
34
35struct 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 */
50struct 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
63struct 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
81struct rt0_hdr {
82 struct ipv6_rt_hdr rt_hdr;
83 __u32 reserved;
84 struct in6_addr addr[];
85
86#define rt0_type rt_hdr.type
87};
88
89/*
90 * routing header type 2
91 */
92
93struct 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
105struct 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
118struct 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 */
142enum {
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_ACCEPT_RA_MIN_LFT,
202 DEVCONF_FORCE_FORWARDING,
203 DEVCONF_MAX
204};
205
206
207#endif /* _IPV6_H */