include/uapi/linux/ipv6.h

   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_4       4       /* Segment Routing with IPv6 */
  44
  45 /*
  46  *      routing header
  47  */
  48 struct ipv6_rt_hdr {
  49         __u8            nexthdr;
  50         __u8            hdrlen;
  51         __u8            type;
  52         __u8            segments_left;
  53
  54         /*
  55          *      type specific data
  56          *      variable length field
  57          */
  58 };
  59
  60
  61 struct ipv6_opt_hdr {
  62         __u8            nexthdr;
  63         __u8            hdrlen;
  64         /*
  65          * TLV encoded option data follows.
  66          */
  67 } __attribute__((packed));      /* required for some archs */
  68
  69 #define ipv6_destopt_hdr ipv6_opt_hdr
  70 #define ipv6_hopopt_hdr  ipv6_opt_hdr
  71
  72 /* Router Alert option values (RFC2711) */
  73 #define IPV6_OPT_ROUTERALERT_MLD        0x0000  /* MLD(RFC2710) */
  74
  75 /*
  76  *      routing header type 0 (used in cmsghdr struct)
  77  */
  78
  79 struct rt0_hdr {
  80         struct ipv6_rt_hdr      rt_hdr;
  81         __u32                   reserved;
  82         struct in6_addr         addr[0];
  83
  84 #define rt0_type                rt_hdr.type
  85 };
  86
  87 /*
  88  *      routing header type 2
  89  */
  90
  91 struct rt2_hdr {
  92         struct ipv6_rt_hdr      rt_hdr;
  93         __u32                   reserved;
  94         struct in6_addr         addr;
  95
  96 #define rt2_type                rt_hdr.type
  97 };
  98
  99 /*
 100  *      home address option in destination options header
 101  */
 102
 103 struct ipv6_destopt_hao {
 104         __u8                    type;
 105         __u8                    length;
 106         struct in6_addr         addr;
 107 } __attribute__((packed));
 108
 109 /*
 110  *      IPv6 fixed header
 111  *
 112  *      BEWARE, it is incorrect. The first 4 bits of flow_lbl
 113  *      are glued to priority now, forming "class".
 114  */
 115
 116 struct ipv6hdr {
 117 #if defined(__LITTLE_ENDIAN_BITFIELD)
 118         __u8                    priority:4,
 119                                 version:4;
 120 #elif defined(__BIG_ENDIAN_BITFIELD)
 121         __u8                    version:4,
 122                                 priority:4;
 123 #else
 124 #error  "Please fix <asm/byteorder.h>"
 125 #endif
 126         __u8                    flow_lbl[3];
 127
 128         __be16                  payload_len;
 129         __u8                    nexthdr;
 130         __u8                    hop_limit;
 131
 132         struct  in6_addr        saddr;
 133         struct  in6_addr        daddr;
 134 };
 135
 136
 137 /* index values for the variables in ipv6_devconf */
 138 enum {
 139         DEVCONF_FORWARDING = 0,
 140         DEVCONF_HOPLIMIT,
 141         DEVCONF_MTU6,
 142         DEVCONF_ACCEPT_RA,
 143         DEVCONF_ACCEPT_REDIRECTS,
 144         DEVCONF_AUTOCONF,
 145         DEVCONF_DAD_TRANSMITS,
 146         DEVCONF_RTR_SOLICITS,
 147         DEVCONF_RTR_SOLICIT_INTERVAL,
 148         DEVCONF_RTR_SOLICIT_DELAY,
 149         DEVCONF_USE_TEMPADDR,
 150         DEVCONF_TEMP_VALID_LFT,
 151         DEVCONF_TEMP_PREFERED_LFT,
 152         DEVCONF_REGEN_MAX_RETRY,
 153         DEVCONF_MAX_DESYNC_FACTOR,
 154         DEVCONF_MAX_ADDRESSES,
 155         DEVCONF_FORCE_MLD_VERSION,
 156         DEVCONF_ACCEPT_RA_DEFRTR,
 157         DEVCONF_ACCEPT_RA_PINFO,
 158         DEVCONF_ACCEPT_RA_RTR_PREF,
 159         DEVCONF_RTR_PROBE_INTERVAL,
 160         DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
 161         DEVCONF_PROXY_NDP,
 162         DEVCONF_OPTIMISTIC_DAD,
 163         DEVCONF_ACCEPT_SOURCE_ROUTE,
 164         DEVCONF_MC_FORWARDING,
 165         DEVCONF_DISABLE_IPV6,
 166         DEVCONF_ACCEPT_DAD,
 167         DEVCONF_FORCE_TLLAO,
 168         DEVCONF_NDISC_NOTIFY,
 169         DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL,
 170         DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL,
 171         DEVCONF_SUPPRESS_FRAG_NDISC,
 172         DEVCONF_ACCEPT_RA_FROM_LOCAL,
 173         DEVCONF_USE_OPTIMISTIC,
 174         DEVCONF_ACCEPT_RA_MTU,
 175         DEVCONF_STABLE_SECRET,
 176         DEVCONF_USE_OIF_ADDRS_ONLY,
 177         DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT,
 178         DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN,
 179         DEVCONF_DROP_UNICAST_IN_L2_MULTICAST,
 180         DEVCONF_DROP_UNSOLICITED_NA,
 181         DEVCONF_KEEP_ADDR_ON_DOWN,
 182         DEVCONF_RTR_SOLICIT_MAX_INTERVAL,
 183         DEVCONF_SEG6_ENABLED,
 184         DEVCONF_SEG6_REQUIRE_HMAC,
 185         DEVCONF_ENHANCED_DAD,
 186         DEVCONF_ADDR_GEN_MODE,
 187         DEVCONF_DISABLE_POLICY,
 188         DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN,
 189         DEVCONF_NDISC_TCLASS,
 190         DEVCONF_MAX
 191 };
 192
 193
 194 #endif /* _UAPI_IPV6_H */