include/linux/xfrm.h

   1 #ifndef _LINUX_XFRM_H
   2 #define _LINUX_XFRM_H
   3
   4 #include <linux/types.h>
   5
   6 /* All of the structures in this file may not change size as they are
   7  * passed into the kernel from userspace via netlink sockets.
   8  */
   9
  10 /* Structure to encapsulate addresses. I do not want to use
  11  * "standard" structure. My apologies.
  12  */
  13 typedef union
  14 {
  15         __u32           a4;
  16         __u32           a6[4];
  17 } xfrm_address_t;
  18
  19 /* Ident of a specific xfrm_state. It is used on input to lookup
  20  * the state by (spi,daddr,ah/esp) or to store information about
  21  * spi, protocol and tunnel address on output.
  22  */
  23 struct xfrm_id
  24 {
  25         xfrm_address_t  daddr;
  26         __u32           spi;
  27         __u8            proto;
  28 };
  29
  30 struct xfrm_sec_ctx {
  31         __u8    ctx_doi;
  32         __u8    ctx_alg;
  33         __u16   ctx_len;
  34         __u32   ctx_sid;
  35         char    ctx_str[0];
  36 };
  37
  38 /* Security Context Domains of Interpretation */
  39 #define XFRM_SC_DOI_RESERVED 0
  40 #define XFRM_SC_DOI_LSM 1
  41
  42 /* Security Context Algorithms */
  43 #define XFRM_SC_ALG_RESERVED 0
  44 #define XFRM_SC_ALG_SELINUX 1
  45
  46 /* Selector, used as selector both on policy rules (SPD) and SAs. */
  47
  48 struct xfrm_selector
  49 {
  50         xfrm_address_t  daddr;
  51         xfrm_address_t  saddr;
  52         __u16   dport;
  53         __u16   dport_mask;
  54         __u16   sport;
  55         __u16   sport_mask;
  56         __u16   family;
  57         __u8    prefixlen_d;
  58         __u8    prefixlen_s;
  59         __u8    proto;
  60         int     ifindex;
  61         uid_t   user;
  62 };
  63
  64 #define XFRM_INF (~(__u64)0)
  65
  66 struct xfrm_lifetime_cfg
  67 {
  68         __u64   soft_byte_limit;
  69         __u64   hard_byte_limit;
  70         __u64   soft_packet_limit;
  71         __u64   hard_packet_limit;
  72         __u64   soft_add_expires_seconds;
  73         __u64   hard_add_expires_seconds;
  74         __u64   soft_use_expires_seconds;
  75         __u64   hard_use_expires_seconds;
  76 };
  77
  78 struct xfrm_lifetime_cur
  79 {
  80         __u64   bytes;
  81         __u64   packets;
  82         __u64   add_time;
  83         __u64   use_time;
  84 };
  85
  86 struct xfrm_replay_state
  87 {
  88         __u32   oseq;
  89         __u32   seq;
  90         __u32   bitmap;
  91 };
  92
  93 struct xfrm_algo {
  94         char    alg_name[64];
  95         int     alg_key_len;    /* in bits */
  96         char    alg_key[0];
  97 };
  98
  99 struct xfrm_stats {
 100         __u32   replay_window;
 101         __u32   replay;
 102         __u32   integrity_failed;
 103 };
 104
 105 enum
 106 {
 107         XFRM_POLICY_IN  = 0,
 108         XFRM_POLICY_OUT = 1,
 109         XFRM_POLICY_FWD = 2,
 110         XFRM_POLICY_MAX = 3
 111 };
 112
 113 enum
 114 {
 115         XFRM_SHARE_ANY,         /* No limitations */
 116         XFRM_SHARE_SESSION,     /* For this session only */
 117         XFRM_SHARE_USER,        /* For this user only */
 118         XFRM_SHARE_UNIQUE       /* Use once */
 119 };
 120
 121 /* Netlink configuration messages.  */
 122 enum {
 123         XFRM_MSG_BASE = 0x10,
 124
 125         XFRM_MSG_NEWSA = 0x10,
 126 #define XFRM_MSG_NEWSA XFRM_MSG_NEWSA
 127         XFRM_MSG_DELSA,
 128 #define XFRM_MSG_DELSA XFRM_MSG_DELSA
 129         XFRM_MSG_GETSA,
 130 #define XFRM_MSG_GETSA XFRM_MSG_GETSA
 131
 132         XFRM_MSG_NEWPOLICY,
 133 #define XFRM_MSG_NEWPOLICY XFRM_MSG_NEWPOLICY
 134         XFRM_MSG_DELPOLICY,
 135 #define XFRM_MSG_DELPOLICY XFRM_MSG_DELPOLICY
 136         XFRM_MSG_GETPOLICY,
 137 #define XFRM_MSG_GETPOLICY XFRM_MSG_GETPOLICY
 138
 139         XFRM_MSG_ALLOCSPI,
 140 #define XFRM_MSG_ALLOCSPI XFRM_MSG_ALLOCSPI
 141         XFRM_MSG_ACQUIRE,
 142 #define XFRM_MSG_ACQUIRE XFRM_MSG_ACQUIRE
 143         XFRM_MSG_EXPIRE,
 144 #define XFRM_MSG_EXPIRE XFRM_MSG_EXPIRE
 145
 146         XFRM_MSG_UPDPOLICY,
 147 #define XFRM_MSG_UPDPOLICY XFRM_MSG_UPDPOLICY
 148         XFRM_MSG_UPDSA,
 149 #define XFRM_MSG_UPDSA XFRM_MSG_UPDSA
 150
 151         XFRM_MSG_POLEXPIRE,
 152 #define XFRM_MSG_POLEXPIRE XFRM_MSG_POLEXPIRE
 153
 154         XFRM_MSG_FLUSHSA,
 155 #define XFRM_MSG_FLUSHSA XFRM_MSG_FLUSHSA
 156         XFRM_MSG_FLUSHPOLICY,
 157 #define XFRM_MSG_FLUSHPOLICY XFRM_MSG_FLUSHPOLICY
 158
 159         __XFRM_MSG_MAX
 160 };
 161 #define XFRM_MSG_MAX (__XFRM_MSG_MAX - 1)
 162
 163 #define XFRM_NR_MSGTYPES (XFRM_MSG_MAX + 1 - XFRM_MSG_BASE)
 164
 165 /*
 166  * Generic LSM security context for comunicating to user space
 167  * NOTE: Same format as sadb_x_sec_ctx
 168  */
 169 struct xfrm_user_sec_ctx {
 170         __u16                   len;
 171         __u16                   exttype;
 172         __u8                    ctx_alg;  /* LSMs: e.g., selinux == 1 */
 173         __u8                    ctx_doi;
 174         __u16                   ctx_len;
 175 };
 176
 177 struct xfrm_user_tmpl {
 178         struct xfrm_id          id;
 179         __u16                   family;
 180         xfrm_address_t          saddr;
 181         __u32                   reqid;
 182         __u8                    mode;
 183         __u8                    share;
 184         __u8                    optional;
 185         __u32                   aalgos;
 186         __u32                   ealgos;
 187         __u32                   calgos;
 188 };
 189
 190 struct xfrm_encap_tmpl {
 191         __u16           encap_type;
 192         __u16           encap_sport;
 193         __u16           encap_dport;
 194         xfrm_address_t  encap_oa;
 195 };
 196
 197 /* Netlink message attributes.  */
 198 enum xfrm_attr_type_t {
 199         XFRMA_UNSPEC,
 200         XFRMA_ALG_AUTH,         /* struct xfrm_algo */
 201         XFRMA_ALG_CRYPT,        /* struct xfrm_algo */
 202         XFRMA_ALG_COMP,         /* struct xfrm_algo */
 203         XFRMA_ENCAP,            /* struct xfrm_algo + struct xfrm_encap_tmpl */
 204         XFRMA_TMPL,             /* 1 or more struct xfrm_user_tmpl */
 205         XFRMA_SA,
 206         XFRMA_POLICY,
 207         XFRMA_SEC_CTX,          /* struct xfrm_sec_ctx */
 208         __XFRMA_MAX
 209
 210 #define XFRMA_MAX (__XFRMA_MAX - 1)
 211 };
 212
 213 struct xfrm_usersa_info {
 214         struct xfrm_selector            sel;
 215         struct xfrm_id                  id;
 216         xfrm_address_t                  saddr;
 217         struct xfrm_lifetime_cfg        lft;
 218         struct xfrm_lifetime_cur        curlft;
 219         struct xfrm_stats               stats;
 220         __u32                           seq;
 221         __u32                           reqid;
 222         __u16                           family;
 223         __u8                            mode; /* 0=transport,1=tunnel */
 224         __u8                            replay_window;
 225         __u8                            flags;
 226 #define XFRM_STATE_NOECN        1
 227 #define XFRM_STATE_DECAP_DSCP   2
 228 #define XFRM_STATE_NOPMTUDISC   4
 229 };
 230
 231 struct xfrm_usersa_id {
 232         xfrm_address_t                  daddr;
 233         __u32                           spi;
 234         __u16                           family;
 235         __u8                            proto;
 236 };
 237
 238 struct xfrm_userspi_info {
 239         struct xfrm_usersa_info         info;
 240         __u32                           min;
 241         __u32                           max;
 242 };
 243
 244 struct xfrm_userpolicy_info {
 245         struct xfrm_selector            sel;
 246         struct xfrm_lifetime_cfg        lft;
 247         struct xfrm_lifetime_cur        curlft;
 248         __u32                           priority;
 249         __u32                           index;
 250         __u8                            dir;
 251         __u8                            action;
 252 #define XFRM_POLICY_ALLOW       0
 253 #define XFRM_POLICY_BLOCK       1
 254         __u8                            flags;
 255 #define XFRM_POLICY_LOCALOK     1       /* Allow user to override global policy */
 256         __u8                            share;
 257 };
 258
 259 struct xfrm_userpolicy_id {
 260         struct xfrm_selector            sel;
 261         __u32                           index;
 262         __u8                            dir;
 263 };
 264
 265 struct xfrm_user_acquire {
 266         struct xfrm_id                  id;
 267         xfrm_address_t                  saddr;
 268         struct xfrm_selector            sel;
 269         struct xfrm_userpolicy_info     policy;
 270         __u32                           aalgos;
 271         __u32                           ealgos;
 272         __u32                           calgos;
 273         __u32                           seq;
 274 };
 275
 276 struct xfrm_user_expire {
 277         struct xfrm_usersa_info         state;
 278         __u8                            hard;
 279 };
 280
 281 struct xfrm_user_polexpire {
 282         struct xfrm_userpolicy_info     pol;
 283         __u8                            hard;
 284 };
 285
 286 struct xfrm_usersa_flush {
 287         __u8                            proto;
 288 };
 289
 290 #ifndef __KERNEL__
 291 /* backwards compatibility for userspace */
 292 #define XFRMGRP_ACQUIRE         1
 293 #define XFRMGRP_EXPIRE          2
 294 #define XFRMGRP_SA              4
 295 #define XFRMGRP_POLICY          8
 296 #endif
 297
 298 enum xfrm_nlgroups {
 299         XFRMNLGRP_NONE,
 300 #define XFRMNLGRP_NONE          XFRMNLGRP_NONE
 301         XFRMNLGRP_ACQUIRE,
 302 #define XFRMNLGRP_ACQUIRE       XFRMNLGRP_ACQUIRE
 303         XFRMNLGRP_EXPIRE,
 304 #define XFRMNLGRP_EXPIRE        XFRMNLGRP_EXPIRE
 305         XFRMNLGRP_SA,
 306 #define XFRMNLGRP_SA            XFRMNLGRP_SA
 307         XFRMNLGRP_POLICY,
 308 #define XFRMNLGRP_POLICY        XFRMNLGRP_POLICY
 309         __XFRMNLGRP_MAX
 310 };
 311 #define XFRMNLGRP_MAX   (__XFRMNLGRP_MAX - 1)
 312
 313 #endif /* _LINUX_XFRM_H */