include/net/xfrm.h

   1 #ifndef _NET_XFRM_H
   2 #define _NET_XFRM_H
   3
   4 #include <linux/compiler.h>
   5 #include <linux/xfrm.h>
   6 #include <linux/spinlock.h>
   7 #include <linux/list.h>
   8 #include <linux/skbuff.h>
   9 #include <linux/socket.h>
  10 #include <linux/pfkeyv2.h>
  11 #include <linux/ipsec.h>
  12 #include <linux/in6.h>
  13 #include <linux/mutex.h>
  14 #include <linux/audit.h>
  15
  16 #include <net/sock.h>
  17 #include <net/dst.h>
  18 #include <net/ip.h>
  19 #include <net/route.h>
  20 #include <net/ipv6.h>
  21 #include <net/ip6_fib.h>
  22 #ifdef CONFIG_XFRM_STATISTICS
  23 #include <net/snmp.h>
  24 #endif
  25
  26 #define XFRM_PROTO_ESP          50
  27 #define XFRM_PROTO_AH           51
  28 #define XFRM_PROTO_COMP         108
  29 #define XFRM_PROTO_IPIP         4
  30 #define XFRM_PROTO_IPV6         41
  31 #define XFRM_PROTO_ROUTING      IPPROTO_ROUTING
  32 #define XFRM_PROTO_DSTOPTS      IPPROTO_DSTOPTS
  33
  34 #define XFRM_ALIGN8(len)        (((len) + 7) & ~7)
  35 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
  36         MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
  37 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
  38         MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
  39
  40 #ifdef CONFIG_XFRM_STATISTICS
  41 DECLARE_SNMP_STAT(struct linux_xfrm_mib, xfrm_statistics);
  42 #define XFRM_INC_STATS(field)           SNMP_INC_STATS(xfrm_statistics, field)
  43 #define XFRM_INC_STATS_BH(field)        SNMP_INC_STATS_BH(xfrm_statistics, field)
  44 #define XFRM_INC_STATS_USER(field)      SNMP_INC_STATS_USER(xfrm_statistics, field)
  45 #else
  46 #define XFRM_INC_STATS(field)
  47 #define XFRM_INC_STATS_BH(field)
  48 #define XFRM_INC_STATS_USER(field)
  49 #endif
  50
  51 extern struct sock *xfrm_nl;
  52 extern u32 sysctl_xfrm_aevent_etime;
  53 extern u32 sysctl_xfrm_aevent_rseqth;
  54 extern int sysctl_xfrm_larval_drop;
  55 extern u32 sysctl_xfrm_acq_expires;
  56
  57 extern struct mutex xfrm_cfg_mutex;
  58
  59 /* Organization of SPD aka "XFRM rules"
  60    ------------------------------------
  61
  62    Basic objects:
  63    - policy rule, struct xfrm_policy (=SPD entry)
  64    - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
  65    - instance of a transformer, struct xfrm_state (=SA)
  66    - template to clone xfrm_state, struct xfrm_tmpl
  67
  68    SPD is plain linear list of xfrm_policy rules, ordered by priority.
  69    (To be compatible with existing pfkeyv2 implementations,
  70    many rules with priority of 0x7fffffff are allowed to exist and
  71    such rules are ordered in an unpredictable way, thanks to bsd folks.)
  72
  73    Lookup is plain linear search until the first match with selector.
  74
  75    If "action" is "block", then we prohibit the flow, otherwise:
  76    if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
  77    policy entry has list of up to XFRM_MAX_DEPTH transformations,
  78    described by templates xfrm_tmpl. Each template is resolved
  79    to a complete xfrm_state (see below) and we pack bundle of transformations
  80    to a dst_entry returned to requestor.
  81
  82    dst -. xfrm  .-> xfrm_state #1
  83     |---. child .-> dst -. xfrm .-> xfrm_state #2
  84                      |---. child .-> dst -. xfrm .-> xfrm_state #3
  85                                       |---. child .-> NULL
  86
  87    Bundles are cached at xrfm_policy struct (field ->bundles).
  88
  89
  90    Resolution of xrfm_tmpl
  91    -----------------------
  92    Template contains:
  93    1. ->mode            Mode: transport or tunnel
  94    2. ->id.proto        Protocol: AH/ESP/IPCOMP
  95    3. ->id.daddr        Remote tunnel endpoint, ignored for transport mode.
  96       Q: allow to resolve security gateway?
  97    4. ->id.spi          If not zero, static SPI.
  98    5. ->saddr           Local tunnel endpoint, ignored for transport mode.
  99    6. ->algos           List of allowed algos. Plain bitmask now.
 100       Q: ealgos, aalgos, calgos. What a mess...
 101    7. ->share           Sharing mode.
 102       Q: how to implement private sharing mode? To add struct sock* to
 103       flow id?
 104
 105    Having this template we search through SAD searching for entries
 106    with appropriate mode/proto/algo, permitted by selector.
 107    If no appropriate entry found, it is requested from key manager.
 108
 109    PROBLEMS:
 110    Q: How to find all the bundles referring to a physical path for
 111       PMTU discovery? Seems, dst should contain list of all parents...
 112       and enter to infinite locking hierarchy disaster.
 113       No! It is easier, we will not search for them, let them find us.
 114       We add genid to each dst plus pointer to genid of raw IP route,
 115       pmtu disc will update pmtu on raw IP route and increase its genid.
 116       dst_check() will see this for top level and trigger resyncing
 117       metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
 118  */
 119
 120 struct xfrm_state_walk {
 121         struct list_head        all;
 122         u8                      state;
 123         union {
 124                 u8              dying;
 125                 u8              proto;
 126         };
 127         u32                     seq;
 128 };
 129
 130 /* Full description of state of transformer. */
 131 struct xfrm_state
 132 {
 133         union {
 134                 struct hlist_node       gclist;
 135                 struct hlist_node       bydst;
 136         };
 137         struct hlist_node       bysrc;
 138         struct hlist_node       byspi;
 139
 140         atomic_t                refcnt;
 141         spinlock_t              lock;
 142
 143         struct xfrm_id          id;
 144         struct xfrm_selector    sel;
 145
 146         u32                     genid;
 147
 148         /* Key manager bits */
 149         struct xfrm_state_walk  km;
 150
 151         /* Parameters of this state. */
 152         struct {
 153                 u32             reqid;
 154                 u8              mode;
 155                 u8              replay_window;
 156                 u8              aalgo, ealgo, calgo;
 157                 u8              flags;
 158                 u16             family;
 159                 xfrm_address_t  saddr;
 160                 int             header_len;
 161                 int             trailer_len;
 162         } props;
 163
 164         struct xfrm_lifetime_cfg lft;
 165
 166         /* Data for transformer */
 167         struct xfrm_algo        *aalg;
 168         struct xfrm_algo        *ealg;
 169         struct xfrm_algo        *calg;
 170         struct xfrm_algo_aead   *aead;
 171
 172         /* Data for encapsulator */
 173         struct xfrm_encap_tmpl  *encap;
 174
 175         /* Data for care-of address */
 176         xfrm_address_t  *coaddr;
 177
 178         /* IPComp needs an IPIP tunnel for handling uncompressed packets */
 179         struct xfrm_state       *tunnel;
 180
 181         /* If a tunnel, number of users + 1 */
 182         atomic_t                tunnel_users;
 183
 184         /* State for replay detection */
 185         struct xfrm_replay_state replay;
 186
 187         /* Replay detection state at the time we sent the last notification */
 188         struct xfrm_replay_state preplay;
 189
 190         /* internal flag that only holds state for delayed aevent at the
 191          * moment
 192         */
 193         u32                     xflags;
 194
 195         /* Replay detection notification settings */
 196         u32                     replay_maxage;
 197         u32                     replay_maxdiff;
 198
 199         /* Replay detection notification timer */
 200         struct timer_list       rtimer;
 201
 202         /* Statistics */
 203         struct xfrm_stats       stats;
 204
 205         struct xfrm_lifetime_cur curlft;
 206         struct timer_list       timer;
 207
 208         /* Last used time */
 209         unsigned long           lastused;
 210
 211         /* Reference to data common to all the instances of this
 212          * transformer. */
 213         const struct xfrm_type  *type;
 214         struct xfrm_mode        *inner_mode;
 215         struct xfrm_mode        *inner_mode_iaf;
 216         struct xfrm_mode        *outer_mode;
 217
 218         /* Security context */
 219         struct xfrm_sec_ctx     *security;
 220
 221         /* Private data of this transformer, format is opaque,
 222          * interpreted by xfrm_type methods. */
 223         void                    *data;
 224 };
 225
 226 /* xflags - make enum if more show up */
 227 #define XFRM_TIME_DEFER 1
 228
 229 enum {
 230         XFRM_STATE_VOID,
 231         XFRM_STATE_ACQ,
 232         XFRM_STATE_VALID,
 233         XFRM_STATE_ERROR,
 234         XFRM_STATE_EXPIRED,
 235         XFRM_STATE_DEAD
 236 };
 237
 238 /* callback structure passed from either netlink or pfkey */
 239 struct km_event
 240 {
 241         union {
 242                 u32 hard;
 243                 u32 proto;
 244                 u32 byid;
 245                 u32 aevent;
 246                 u32 type;
 247         } data;
 248
 249         u32     seq;
 250         u32     pid;
 251         u32     event;
 252 };
 253
 254 struct net_device;
 255 struct xfrm_type;
 256 struct xfrm_dst;
 257 struct xfrm_policy_afinfo {
 258         unsigned short          family;
 259         struct dst_ops          *dst_ops;
 260         void                    (*garbage_collect)(void);
 261         struct dst_entry        *(*dst_lookup)(int tos, xfrm_address_t *saddr,
 262                                                xfrm_address_t *daddr);
 263         int                     (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
 264         struct dst_entry        *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
 265         void                    (*decode_session)(struct sk_buff *skb,
 266                                                   struct flowi *fl,
 267                                                   int reverse);
 268         int                     (*get_tos)(struct flowi *fl);
 269         int                     (*init_path)(struct xfrm_dst *path,
 270                                              struct dst_entry *dst,
 271                                              int nfheader_len);
 272         int                     (*fill_dst)(struct xfrm_dst *xdst,
 273                                             struct net_device *dev);
 274 };
 275
 276 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
 277 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
 278 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
 279 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
 280
 281 struct xfrm_tmpl;
 282 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
 283 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
 284 extern int __xfrm_state_delete(struct xfrm_state *x);
 285
 286 struct xfrm_state_afinfo {
 287         unsigned int            family;
 288         unsigned int            proto;
 289         __be16                  eth_proto;
 290         struct module           *owner;
 291         const struct xfrm_type  *type_map[IPPROTO_MAX];
 292         struct xfrm_mode        *mode_map[XFRM_MODE_MAX];
 293         int                     (*init_flags)(struct xfrm_state *x);
 294         void                    (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
 295                                                 struct xfrm_tmpl *tmpl,
 296                                                 xfrm_address_t *daddr, xfrm_address_t *saddr);
 297         int                     (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
 298         int                     (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
 299         int                     (*output)(struct sk_buff *skb);
 300         int                     (*extract_input)(struct xfrm_state *x,
 301                                                  struct sk_buff *skb);
 302         int                     (*extract_output)(struct xfrm_state *x,
 303                                                   struct sk_buff *skb);
 304         int                     (*transport_finish)(struct sk_buff *skb,
 305                                                     int async);
 306 };
 307
 308 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
 309 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
 310
 311 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
 312
 313 struct xfrm_type
 314 {
 315         char                    *description;
 316         struct module           *owner;
 317         __u8                    proto;
 318         __u8                    flags;
 319 #define XFRM_TYPE_NON_FRAGMENT  1
 320 #define XFRM_TYPE_REPLAY_PROT   2
 321 #define XFRM_TYPE_LOCAL_COADDR  4
 322 #define XFRM_TYPE_REMOTE_COADDR 8
 323
 324         int                     (*init_state)(struct xfrm_state *x);
 325         void                    (*destructor)(struct xfrm_state *);
 326         int                     (*input)(struct xfrm_state *, struct sk_buff *skb);
 327         int                     (*output)(struct xfrm_state *, struct sk_buff *pskb);
 328         int                     (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
 329         int                     (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
 330         /* Estimate maximal size of result of transformation of a dgram */
 331         u32                     (*get_mtu)(struct xfrm_state *, int size);
 332 };
 333
 334 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
 335 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
 336
 337 struct xfrm_mode {
 338         /*
 339          * Remove encapsulation header.
 340          *
 341          * The IP header will be moved over the top of the encapsulation
 342          * header.
 343          *
 344          * On entry, the transport header shall point to where the IP header
 345          * should be and the network header shall be set to where the IP
 346          * header currently is.  skb->data shall point to the start of the
 347          * payload.
 348          */
 349         int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
 350
 351         /*
 352          * This is the actual input entry point.
 353          *
 354          * For transport mode and equivalent this would be identical to
 355          * input2 (which does not need to be set).  While tunnel mode
 356          * and equivalent would set this to the tunnel encapsulation function
 357          * xfrm4_prepare_input that would in turn call input2.
 358          */
 359         int (*input)(struct xfrm_state *x, struct sk_buff *skb);
 360
 361         /*
 362          * Add encapsulation header.
 363          *
 364          * On exit, the transport header will be set to the start of the
 365          * encapsulation header to be filled in by x->type->output and
 366          * the mac header will be set to the nextheader (protocol for
 367          * IPv4) field of the extension header directly preceding the
 368          * encapsulation header, or in its absence, that of the top IP
 369          * header.  The value of the network header will always point
 370          * to the top IP header while skb->data will point to the payload.
 371          */
 372         int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
 373
 374         /*
 375          * This is the actual output entry point.
 376          *
 377          * For transport mode and equivalent this would be identical to
 378          * output2 (which does not need to be set).  While tunnel mode
 379          * and equivalent would set this to a tunnel encapsulation function
 380          * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
 381          * call output2.
 382          */
 383         int (*output)(struct xfrm_state *x, struct sk_buff *skb);
 384
 385         struct xfrm_state_afinfo *afinfo;
 386         struct module *owner;
 387         unsigned int encap;
 388         int flags;
 389 };
 390
 391 /* Flags for xfrm_mode. */
 392 enum {
 393         XFRM_MODE_FLAG_TUNNEL = 1,
 394 };
 395
 396 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
 397 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
 398
 399 static inline int xfrm_af2proto(unsigned int family)
 400 {
 401         switch(family) {
 402         case AF_INET:
 403                 return IPPROTO_IPIP;
 404         case AF_INET6:
 405                 return IPPROTO_IPV6;
 406         default:
 407                 return 0;
 408         }
 409 }
 410
 411 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
 412 {
 413         if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
 414             (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
 415                 return x->inner_mode;
 416         else
 417                 return x->inner_mode_iaf;
 418 }
 419
 420 struct xfrm_tmpl
 421 {
 422 /* id in template is interpreted as:
 423  * daddr - destination of tunnel, may be zero for transport mode.
 424  * spi   - zero to acquire spi. Not zero if spi is static, then
 425  *         daddr must be fixed too.
 426  * proto - AH/ESP/IPCOMP
 427  */
 428         struct xfrm_id          id;
 429
 430 /* Source address of tunnel. Ignored, if it is not a tunnel. */
 431         xfrm_address_t          saddr;
 432
 433         unsigned short          encap_family;
 434
 435         __u32                   reqid;
 436
 437 /* Mode: transport, tunnel etc. */
 438         __u8                    mode;
 439
 440 /* Sharing mode: unique, this session only, this user only etc. */
 441         __u8                    share;
 442
 443 /* May skip this transfomration if no SA is found */
 444         __u8                    optional;
 445
 446 /* Skip aalgos/ealgos/calgos checks. */
 447         __u8                    allalgs;
 448
 449 /* Bit mask of algos allowed for acquisition */
 450         __u32                   aalgos;
 451         __u32                   ealgos;
 452         __u32                   calgos;
 453 };
 454
 455 #define XFRM_MAX_DEPTH          6
 456
 457 struct xfrm_policy_walk_entry {
 458         struct list_head        all;
 459         u8                      dead;
 460 };
 461
 462 struct xfrm_policy_walk {
 463         struct xfrm_policy_walk_entry walk;
 464         u8 type;
 465         u32 seq;
 466 };
 467
 468 struct xfrm_policy
 469 {
 470         struct hlist_node       bydst;
 471         struct hlist_node       byidx;
 472
 473         /* This lock only affects elements except for entry. */
 474         rwlock_t                lock;
 475         atomic_t                refcnt;
 476         struct timer_list       timer;
 477
 478         u32                     priority;
 479         u32                     index;
 480         struct xfrm_selector    selector;
 481         struct xfrm_lifetime_cfg lft;
 482         struct xfrm_lifetime_cur curlft;
 483         struct dst_entry       *bundles;
 484         struct xfrm_policy_walk_entry walk;
 485         u8                      type;
 486         u8                      action;
 487         u8                      flags;
 488         u8                      xfrm_nr;
 489         u16                     family;
 490         struct xfrm_sec_ctx     *security;
 491         struct xfrm_tmpl        xfrm_vec[XFRM_MAX_DEPTH];
 492 };
 493
 494 struct xfrm_kmaddress {
 495         xfrm_address_t          local;
 496         xfrm_address_t          remote;
 497         u32                     reserved;
 498         u16                     family;
 499 };
 500
 501 struct xfrm_migrate {
 502         xfrm_address_t          old_daddr;
 503         xfrm_address_t          old_saddr;
 504         xfrm_address_t          new_daddr;
 505         xfrm_address_t          new_saddr;
 506         u8                      proto;
 507         u8                      mode;
 508         u16                     reserved;
 509         u32                     reqid;
 510         u16                     old_family;
 511         u16                     new_family;
 512 };
 513
 514 #define XFRM_KM_TIMEOUT                30
 515 /* which seqno */
 516 #define XFRM_REPLAY_SEQ         1
 517 #define XFRM_REPLAY_OSEQ        2
 518 #define XFRM_REPLAY_SEQ_MASK    3
 519 /* what happened */
 520 #define XFRM_REPLAY_UPDATE      XFRM_AE_CR
 521 #define XFRM_REPLAY_TIMEOUT     XFRM_AE_CE
 522
 523 /* default aevent timeout in units of 100ms */
 524 #define XFRM_AE_ETIME                   10
 525 /* Async Event timer multiplier */
 526 #define XFRM_AE_ETH_M                   10
 527 /* default seq threshold size */
 528 #define XFRM_AE_SEQT_SIZE               2
 529
 530 struct xfrm_mgr
 531 {
 532         struct list_head        list;
 533         char                    *id;
 534         int                     (*notify)(struct xfrm_state *x, struct km_event *c);
 535         int                     (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
 536         struct xfrm_policy      *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
 537         int                     (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
 538         int                     (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
 539         int                     (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
 540         int                     (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
 541 };
 542
 543 extern int xfrm_register_km(struct xfrm_mgr *km);
 544 extern int xfrm_unregister_km(struct xfrm_mgr *km);
 545
 546 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
 547
 548 /*
 549  * This structure is used for the duration where packets are being
 550  * transformed by IPsec.  As soon as the packet leaves IPsec the
 551  * area beyond the generic IP part may be overwritten.
 552  */
 553 struct xfrm_skb_cb {
 554         union {
 555                 struct inet_skb_parm h4;
 556                 struct inet6_skb_parm h6;
 557         } header;
 558
 559         /* Sequence number for replay protection. */
 560         union {
 561                 u64 output;
 562                 __be32 input;
 563         } seq;
 564 };
 565
 566 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
 567
 568 /*
 569  * This structure is used by the afinfo prepare_input/prepare_output functions
 570  * to transmit header information to the mode input/output functions.
 571  */
 572 struct xfrm_mode_skb_cb {
 573         union {
 574                 struct inet_skb_parm h4;
 575                 struct inet6_skb_parm h6;
 576         } header;
 577
 578         /* Copied from header for IPv4, always set to zero and DF for IPv6. */
 579         __be16 id;
 580         __be16 frag_off;
 581
 582         /* IP header length (excluding options or extension headers). */
 583         u8 ihl;
 584
 585         /* TOS for IPv4, class for IPv6. */
 586         u8 tos;
 587
 588         /* TTL for IPv4, hop limitfor IPv6. */
 589         u8 ttl;
 590
 591         /* Protocol for IPv4, NH for IPv6. */
 592         u8 protocol;
 593
 594         /* Option length for IPv4, zero for IPv6. */
 595         u8 optlen;
 596
 597         /* Used by IPv6 only, zero for IPv4. */
 598         u8 flow_lbl[3];
 599 };
 600
 601 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
 602
 603 /*
 604  * This structure is used by the input processing to locate the SPI and
 605  * related information.
 606  */
 607 struct xfrm_spi_skb_cb {
 608         union {
 609                 struct inet_skb_parm h4;
 610                 struct inet6_skb_parm h6;
 611         } header;
 612
 613         unsigned int daddroff;
 614         unsigned int family;
 615 };
 616
 617 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
 618
 619 /* Audit Information */
 620 struct xfrm_audit
 621 {
 622         u32     secid;
 623         uid_t   loginuid;
 624         u32     sessionid;
 625 };
 626
 627 #ifdef CONFIG_AUDITSYSCALL
 628 static inline struct audit_buffer *xfrm_audit_start(const char *op)
 629 {
 630         struct audit_buffer *audit_buf = NULL;
 631
 632         if (audit_enabled == 0)
 633                 return NULL;
 634         audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
 635                                     AUDIT_MAC_IPSEC_EVENT);
 636         if (audit_buf == NULL)
 637                 return NULL;
 638         audit_log_format(audit_buf, "op=%s", op);
 639         return audit_buf;
 640 }
 641
 642 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
 643                                              struct audit_buffer *audit_buf)
 644 {
 645         char *secctx;
 646         u32 secctx_len;
 647
 648         audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
 649         if (secid != 0 &&
 650             security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
 651                 audit_log_format(audit_buf, " subj=%s", secctx);
 652                 security_release_secctx(secctx, secctx_len);
 653         } else
 654                 audit_log_task_context(audit_buf);
 655 }
 656
 657 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 658                                   u32 auid, u32 ses, u32 secid);
 659 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 660                                   u32 auid, u32 ses, u32 secid);
 661 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
 662                                  u32 auid, u32 ses, u32 secid);
 663 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 664                                     u32 auid, u32 ses, u32 secid);
 665 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 666                                              struct sk_buff *skb);
 667 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
 668 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 669                                       __be32 net_spi, __be32 net_seq);
 670 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
 671                                      struct sk_buff *skb, u8 proto);
 672 #else
 673
 674 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 675                                   u32 auid, u32 ses, u32 secid)
 676 {
 677 }
 678
 679 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 680                                   u32 auid, u32 ses, u32 secid)
 681 {
 682 }
 683
 684 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
 685                                  u32 auid, u32 ses, u32 secid)
 686 {
 687 }
 688
 689 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 690                                     u32 auid, u32 ses, u32 secid)
 691 {
 692 }
 693
 694 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 695                                              struct sk_buff *skb)
 696 {
 697 }
 698
 699 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
 700                                       u16 family)
 701 {
 702 }
 703
 704 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 705                                       __be32 net_spi, __be32 net_seq)
 706 {
 707 }
 708
 709 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
 710                                      struct sk_buff *skb, u8 proto)
 711 {
 712 }
 713 #endif /* CONFIG_AUDITSYSCALL */
 714
 715 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
 716 {
 717         if (likely(policy != NULL))
 718                 atomic_inc(&policy->refcnt);
 719 }
 720
 721 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
 722
 723 static inline void xfrm_pol_put(struct xfrm_policy *policy)
 724 {
 725         if (atomic_dec_and_test(&policy->refcnt))
 726                 xfrm_policy_destroy(policy);
 727 }
 728
 729 #ifdef CONFIG_XFRM_SUB_POLICY
 730 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 731 {
 732         int i;
 733         for (i = npols - 1; i >= 0; --i)
 734                 xfrm_pol_put(pols[i]);
 735 }
 736 #else
 737 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 738 {
 739         xfrm_pol_put(pols[0]);
 740 }
 741 #endif
 742
 743 extern void __xfrm_state_destroy(struct xfrm_state *);
 744
 745 static inline void __xfrm_state_put(struct xfrm_state *x)
 746 {
 747         atomic_dec(&x->refcnt);
 748 }
 749
 750 static inline void xfrm_state_put(struct xfrm_state *x)
 751 {
 752         if (atomic_dec_and_test(&x->refcnt))
 753                 __xfrm_state_destroy(x);
 754 }
 755
 756 static inline void xfrm_state_hold(struct xfrm_state *x)
 757 {
 758         atomic_inc(&x->refcnt);
 759 }
 760
 761 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
 762 {
 763         __be32 *a1 = token1;
 764         __be32 *a2 = token2;
 765         int pdw;
 766         int pbi;
 767
 768         pdw = prefixlen >> 5;     /* num of whole __u32 in prefix */
 769         pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
 770
 771         if (pdw)
 772                 if (memcmp(a1, a2, pdw << 2))
 773                         return 0;
 774
 775         if (pbi) {
 776                 __be32 mask;
 777
 778                 mask = htonl((0xffffffff) << (32 - pbi));
 779
 780                 if ((a1[pdw] ^ a2[pdw]) & mask)
 781                         return 0;
 782         }
 783
 784         return 1;
 785 }
 786
 787 static __inline__
 788 __be16 xfrm_flowi_sport(struct flowi *fl)
 789 {
 790         __be16 port;
 791         switch(fl->proto) {
 792         case IPPROTO_TCP:
 793         case IPPROTO_UDP:
 794         case IPPROTO_UDPLITE:
 795         case IPPROTO_SCTP:
 796                 port = fl->fl_ip_sport;
 797                 break;
 798         case IPPROTO_ICMP:
 799         case IPPROTO_ICMPV6:
 800                 port = htons(fl->fl_icmp_type);
 801                 break;
 802         case IPPROTO_MH:
 803                 port = htons(fl->fl_mh_type);
 804                 break;
 805         default:
 806                 port = 0;       /*XXX*/
 807         }
 808         return port;
 809 }
 810
 811 static __inline__
 812 __be16 xfrm_flowi_dport(struct flowi *fl)
 813 {
 814         __be16 port;
 815         switch(fl->proto) {
 816         case IPPROTO_TCP:
 817         case IPPROTO_UDP:
 818         case IPPROTO_UDPLITE:
 819         case IPPROTO_SCTP:
 820                 port = fl->fl_ip_dport;
 821                 break;
 822         case IPPROTO_ICMP:
 823         case IPPROTO_ICMPV6:
 824                 port = htons(fl->fl_icmp_code);
 825                 break;
 826         default:
 827                 port = 0;       /*XXX*/
 828         }
 829         return port;
 830 }
 831
 832 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
 833                                unsigned short family);
 834
 835 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 836 /*      If neither has a context --> match
 837  *      Otherwise, both must have a context and the sids, doi, alg must match
 838  */
 839 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 840 {
 841         return ((!s1 && !s2) ||
 842                 (s1 && s2 &&
 843                  (s1->ctx_sid == s2->ctx_sid) &&
 844                  (s1->ctx_doi == s2->ctx_doi) &&
 845                  (s1->ctx_alg == s2->ctx_alg)));
 846 }
 847 #else
 848 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 849 {
 850         return 1;
 851 }
 852 #endif
 853
 854 /* A struct encoding bundle of transformations to apply to some set of flow.
 855  *
 856  * dst->child points to the next element of bundle.
 857  * dst->xfrm  points to an instanse of transformer.
 858  *
 859  * Due to unfortunate limitations of current routing cache, which we
 860  * have no time to fix, it mirrors struct rtable and bound to the same
 861  * routing key, including saddr,daddr. However, we can have many of
 862  * bundles differing by session id. All the bundles grow from a parent
 863  * policy rule.
 864  */
 865 struct xfrm_dst
 866 {
 867         union {
 868                 struct dst_entry        dst;
 869                 struct rtable           rt;
 870                 struct rt6_info         rt6;
 871         } u;
 872         struct dst_entry *route;
 873 #ifdef CONFIG_XFRM_SUB_POLICY
 874         struct flowi *origin;
 875         struct xfrm_selector *partner;
 876 #endif
 877         u32 genid;
 878         u32 route_mtu_cached;
 879         u32 child_mtu_cached;
 880         u32 route_cookie;
 881         u32 path_cookie;
 882 };
 883
 884 #ifdef CONFIG_XFRM
 885 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
 886 {
 887         dst_release(xdst->route);
 888         if (likely(xdst->u.dst.xfrm))
 889                 xfrm_state_put(xdst->u.dst.xfrm);
 890 #ifdef CONFIG_XFRM_SUB_POLICY
 891         kfree(xdst->origin);
 892         xdst->origin = NULL;
 893         kfree(xdst->partner);
 894         xdst->partner = NULL;
 895 #endif
 896 }
 897 #endif
 898
 899 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
 900
 901 struct sec_path
 902 {
 903         atomic_t                refcnt;
 904         int                     len;
 905         struct xfrm_state       *xvec[XFRM_MAX_DEPTH];
 906 };
 907
 908 static inline struct sec_path *
 909 secpath_get(struct sec_path *sp)
 910 {
 911         if (sp)
 912                 atomic_inc(&sp->refcnt);
 913         return sp;
 914 }
 915
 916 extern void __secpath_destroy(struct sec_path *sp);
 917
 918 static inline void
 919 secpath_put(struct sec_path *sp)
 920 {
 921         if (sp && atomic_dec_and_test(&sp->refcnt))
 922                 __secpath_destroy(sp);
 923 }
 924
 925 extern struct sec_path *secpath_dup(struct sec_path *src);
 926
 927 static inline void
 928 secpath_reset(struct sk_buff *skb)
 929 {
 930 #ifdef CONFIG_XFRM
 931         secpath_put(skb->sp);
 932         skb->sp = NULL;
 933 #endif
 934 }
 935
 936 static inline int
 937 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
 938 {
 939         switch (family) {
 940         case AF_INET:
 941                 return addr->a4 == 0;
 942         case AF_INET6:
 943                 return ipv6_addr_any((struct in6_addr *)&addr->a6);
 944         }
 945         return 0;
 946 }
 947
 948 static inline int
 949 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 950 {
 951         return  (tmpl->saddr.a4 &&
 952                  tmpl->saddr.a4 != x->props.saddr.a4);
 953 }
 954
 955 static inline int
 956 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 957 {
 958         return  (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
 959                  ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
 960 }
 961
 962 static inline int
 963 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
 964 {
 965         switch (family) {
 966         case AF_INET:
 967                 return __xfrm4_state_addr_cmp(tmpl, x);
 968         case AF_INET6:
 969                 return __xfrm6_state_addr_cmp(tmpl, x);
 970         }
 971         return !0;
 972 }
 973
 974 #ifdef CONFIG_XFRM
 975 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
 976
 977 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
 978                                        struct sk_buff *skb,
 979                                        unsigned int family, int reverse)
 980 {
 981         int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
 982
 983         if (sk && sk->sk_policy[XFRM_POLICY_IN])
 984                 return __xfrm_policy_check(sk, ndir, skb, family);
 985
 986         return  (!xfrm_policy_count[dir] && !skb->sp) ||
 987                 (skb->dst->flags & DST_NOPOLICY) ||
 988                 __xfrm_policy_check(sk, ndir, skb, family);
 989 }
 990
 991 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
 992 {
 993         return __xfrm_policy_check2(sk, dir, skb, family, 0);
 994 }
 995
 996 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 997 {
 998         return xfrm_policy_check(sk, dir, skb, AF_INET);
 999 }
1000
1001 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1002 {
1003         return xfrm_policy_check(sk, dir, skb, AF_INET6);
1004 }
1005
1006 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1007                                              struct sk_buff *skb)
1008 {
1009         return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1010 }
1011
1012 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1013                                              struct sk_buff *skb)
1014 {
1015         return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1016 }
1017
1018 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1019                                  unsigned int family, int reverse);
1020
1021 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1022                                       unsigned int family)
1023 {
1024         return __xfrm_decode_session(skb, fl, family, 0);
1025 }
1026
1027 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1028                                               struct flowi *fl,
1029                                               unsigned int family)
1030 {
1031         return __xfrm_decode_session(skb, fl, family, 1);
1032 }
1033
1034 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1035
1036 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1037 {
1038         return  !xfrm_policy_count[XFRM_POLICY_OUT] ||
1039                 (skb->dst->flags & DST_NOXFRM) ||
1040                 __xfrm_route_forward(skb, family);
1041 }
1042
1043 static inline int xfrm4_route_forward(struct sk_buff *skb)
1044 {
1045         return xfrm_route_forward(skb, AF_INET);
1046 }
1047
1048 static inline int xfrm6_route_forward(struct sk_buff *skb)
1049 {
1050         return xfrm_route_forward(skb, AF_INET6);
1051 }
1052
1053 extern int __xfrm_sk_clone_policy(struct sock *sk);
1054
1055 static inline int xfrm_sk_clone_policy(struct sock *sk)
1056 {
1057         if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1058                 return __xfrm_sk_clone_policy(sk);
1059         return 0;
1060 }
1061
1062 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1063
1064 static inline void xfrm_sk_free_policy(struct sock *sk)
1065 {
1066         if (unlikely(sk->sk_policy[0] != NULL)) {
1067                 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1068                 sk->sk_policy[0] = NULL;
1069         }
1070         if (unlikely(sk->sk_policy[1] != NULL)) {
1071                 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1072                 sk->sk_policy[1] = NULL;
1073         }
1074 }
1075
1076 #else
1077
1078 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1079 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1080 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1081 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1082 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1083 {
1084         return 1;
1085 }
1086 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1087 {
1088         return 1;
1089 }
1090 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1091 {
1092         return 1;
1093 }
1094 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1095                                               struct flowi *fl,
1096                                               unsigned int family)
1097 {
1098         return -ENOSYS;
1099 }
1100 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1101                                              struct sk_buff *skb)
1102 {
1103         return 1;
1104 }
1105 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1106                                              struct sk_buff *skb)
1107 {
1108         return 1;
1109 }
1110 #endif
1111
1112 static __inline__
1113 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1114 {
1115         switch (family){
1116         case AF_INET:
1117                 return (xfrm_address_t *)&fl->fl4_dst;
1118         case AF_INET6:
1119                 return (xfrm_address_t *)&fl->fl6_dst;
1120         }
1121         return NULL;
1122 }
1123
1124 static __inline__
1125 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1126 {
1127         switch (family){
1128         case AF_INET:
1129                 return (xfrm_address_t *)&fl->fl4_src;
1130         case AF_INET6:
1131                 return (xfrm_address_t *)&fl->fl6_src;
1132         }
1133         return NULL;
1134 }
1135
1136 static __inline__
1137 void xfrm_flowi_addr_get(struct flowi *fl,
1138                          xfrm_address_t *saddr, xfrm_address_t *daddr,
1139                          unsigned short family)
1140 {
1141         switch(family) {
1142         case AF_INET:
1143                 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1144                 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1145                 break;
1146         case AF_INET6:
1147                 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1148                 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1149                 break;
1150         }
1151 }
1152
1153 static __inline__ int
1154 __xfrm4_state_addr_check(struct xfrm_state *x,
1155                          xfrm_address_t *daddr, xfrm_address_t *saddr)
1156 {
1157         if (daddr->a4 == x->id.daddr.a4 &&
1158             (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1159                 return 1;
1160         return 0;
1161 }
1162
1163 static __inline__ int
1164 __xfrm6_state_addr_check(struct xfrm_state *x,
1165                          xfrm_address_t *daddr, xfrm_address_t *saddr)
1166 {
1167         if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1168             (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1169              ipv6_addr_any((struct in6_addr *)saddr) ||
1170              ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1171                 return 1;
1172         return 0;
1173 }
1174
1175 static __inline__ int
1176 xfrm_state_addr_check(struct xfrm_state *x,
1177                       xfrm_address_t *daddr, xfrm_address_t *saddr,
1178                       unsigned short family)
1179 {
1180         switch (family) {
1181         case AF_INET:
1182                 return __xfrm4_state_addr_check(x, daddr, saddr);
1183         case AF_INET6:
1184                 return __xfrm6_state_addr_check(x, daddr, saddr);
1185         }
1186         return 0;
1187 }
1188
1189 static __inline__ int
1190 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1191                            unsigned short family)
1192 {
1193         switch (family) {
1194         case AF_INET:
1195                 return __xfrm4_state_addr_check(x,
1196                                                 (xfrm_address_t *)&fl->fl4_dst,
1197                                                 (xfrm_address_t *)&fl->fl4_src);
1198         case AF_INET6:
1199                 return __xfrm6_state_addr_check(x,
1200                                                 (xfrm_address_t *)&fl->fl6_dst,
1201                                                 (xfrm_address_t *)&fl->fl6_src);
1202         }
1203         return 0;
1204 }
1205
1206 static inline int xfrm_state_kern(struct xfrm_state *x)
1207 {
1208         return atomic_read(&x->tunnel_users);
1209 }
1210
1211 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1212 {
1213         return (!userproto || proto == userproto ||
1214                 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1215                                                   proto == IPPROTO_ESP ||
1216                                                   proto == IPPROTO_COMP)));
1217 }
1218
1219 /*
1220  * xfrm algorithm information
1221  */
1222 struct xfrm_algo_aead_info {
1223         u16 icv_truncbits;
1224 };
1225
1226 struct xfrm_algo_auth_info {
1227         u16 icv_truncbits;
1228         u16 icv_fullbits;
1229 };
1230
1231 struct xfrm_algo_encr_info {
1232         u16 blockbits;
1233         u16 defkeybits;
1234 };
1235
1236 struct xfrm_algo_comp_info {
1237         u16 threshold;
1238 };
1239
1240 struct xfrm_algo_desc {
1241         char *name;
1242         char *compat;
1243         u8 available:1;
1244         union {
1245                 struct xfrm_algo_aead_info aead;
1246                 struct xfrm_algo_auth_info auth;
1247                 struct xfrm_algo_encr_info encr;
1248                 struct xfrm_algo_comp_info comp;
1249         } uinfo;
1250         struct sadb_alg desc;
1251 };
1252
1253 /* XFRM tunnel handlers.  */
1254 struct xfrm_tunnel {
1255         int (*handler)(struct sk_buff *skb);
1256         int (*err_handler)(struct sk_buff *skb, __u32 info);
1257
1258         struct xfrm_tunnel *next;
1259         int priority;
1260 };
1261
1262 struct xfrm6_tunnel {
1263         int (*handler)(struct sk_buff *skb);
1264         int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1265                            int type, int code, int offset, __be32 info);
1266         struct xfrm6_tunnel *next;
1267         int priority;
1268 };
1269
1270 extern void xfrm_init(void);
1271 extern void xfrm4_init(void);
1272 extern void xfrm_state_init(void);
1273 extern void xfrm4_state_init(void);
1274 #ifdef CONFIG_XFRM
1275 extern int xfrm6_init(void);
1276 extern void xfrm6_fini(void);
1277 extern int xfrm6_state_init(void);
1278 extern void xfrm6_state_fini(void);
1279 #else
1280 static inline int xfrm6_init(void)
1281 {
1282         return 0;
1283 }
1284 static inline void xfrm6_fini(void)
1285 {
1286         ;
1287 }
1288 #endif
1289
1290 #ifdef CONFIG_XFRM_STATISTICS
1291 extern int xfrm_proc_init(void);
1292 #endif
1293
1294 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1295 extern int xfrm_state_walk(struct xfrm_state_walk *walk,
1296                            int (*func)(struct xfrm_state *, int, void*), void *);
1297 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1298 extern struct xfrm_state *xfrm_state_alloc(void);
1299 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1300                                           struct flowi *fl, struct xfrm_tmpl *tmpl,
1301                                           struct xfrm_policy *pol, int *err,
1302                                           unsigned short family);
1303 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1304                                                xfrm_address_t *saddr,
1305                                                unsigned short family,
1306                                                u8 mode, u8 proto, u32 reqid);
1307 extern int xfrm_state_check_expire(struct xfrm_state *x);
1308 extern void xfrm_state_insert(struct xfrm_state *x);
1309 extern int xfrm_state_add(struct xfrm_state *x);
1310 extern int xfrm_state_update(struct xfrm_state *x);
1311 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1312 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1313 #ifdef CONFIG_XFRM_SUB_POLICY
1314 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1315                           int n, unsigned short family);
1316 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1317                            int n, unsigned short family);
1318 #else
1319 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1320                                  int n, unsigned short family)
1321 {
1322         return -ENOSYS;
1323 }
1324
1325 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1326                                   int n, unsigned short family)
1327 {
1328         return -ENOSYS;
1329 }
1330 #endif
1331
1332 struct xfrmk_sadinfo {
1333         u32 sadhcnt; /* current hash bkts */
1334         u32 sadhmcnt; /* max allowed hash bkts */
1335         u32 sadcnt; /* current running count */
1336 };
1337
1338 struct xfrmk_spdinfo {
1339         u32 incnt;
1340         u32 outcnt;
1341         u32 fwdcnt;
1342         u32 inscnt;
1343         u32 outscnt;
1344         u32 fwdscnt;
1345         u32 spdhcnt;
1346         u32 spdhmcnt;
1347 };
1348
1349 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1350 extern int xfrm_state_delete(struct xfrm_state *x);
1351 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1352 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1353 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1354 extern int xfrm_replay_check(struct xfrm_state *x,
1355                              struct sk_buff *skb, __be32 seq);
1356 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1357 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1358 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1359 extern int xfrm_init_state(struct xfrm_state *x);
1360 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1361 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1362                       int encap_type);
1363 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1364 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1365 extern int xfrm_output(struct sk_buff *skb);
1366 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1367 extern int xfrm4_extract_header(struct sk_buff *skb);
1368 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1369 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1370                            int encap_type);
1371 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1372 extern int xfrm4_rcv(struct sk_buff *skb);
1373
1374 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1375 {
1376         return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1377 }
1378
1379 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1380 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1381 extern int xfrm4_output(struct sk_buff *skb);
1382 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1383 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1384 extern int xfrm6_extract_header(struct sk_buff *skb);
1385 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1386 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1387 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1388 extern int xfrm6_rcv(struct sk_buff *skb);
1389 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1390                             xfrm_address_t *saddr, u8 proto);
1391 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1392 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1393 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1394 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1395 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1396 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1397 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1398 extern int xfrm6_output(struct sk_buff *skb);
1399 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1400                                  u8 **prevhdr);
1401
1402 #ifdef CONFIG_XFRM
1403 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1404 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1405 #else
1406 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1407 {
1408         return -ENOPROTOOPT;
1409 }
1410
1411 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1412 {
1413         /* should not happen */
1414         kfree_skb(skb);
1415         return 0;
1416 }
1417 #endif
1418
1419 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1420
1421 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1422 extern int xfrm_policy_walk(struct xfrm_policy_walk *walk,
1423         int (*func)(struct xfrm_policy *, int, int, void*), void *);
1424 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1425 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1426 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1427                                           struct xfrm_selector *sel,
1428                                           struct xfrm_sec_ctx *ctx, int delete,
1429                                           int *err);
1430 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1431 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1432 u32 xfrm_get_acqseq(void);
1433 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1434 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1435                                   xfrm_address_t *daddr, xfrm_address_t *saddr,
1436                                   int create, unsigned short family);
1437 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1438 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1439                           struct flowi *fl, int family, int strict);
1440
1441 #ifdef CONFIG_XFRM_MIGRATE
1442 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1443                       struct xfrm_migrate *m, int num_bundles,
1444                       struct xfrm_kmaddress *k);
1445 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1446 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1447                                               struct xfrm_migrate *m);
1448 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1449                         struct xfrm_migrate *m, int num_bundles,
1450                         struct xfrm_kmaddress *k);
1451 #endif
1452
1453 extern wait_queue_head_t km_waitq;
1454 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1455 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1456 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1457
1458 extern void xfrm_input_init(void);
1459 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1460
1461 extern void xfrm_probe_algs(void);
1462 extern int xfrm_count_auth_supported(void);
1463 extern int xfrm_count_enc_supported(void);
1464 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1465 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1466 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1467 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1468 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1469 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1470 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1471 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1472 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1473                                                    int probe);
1474
1475 struct hash_desc;
1476 struct scatterlist;
1477 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1478                               unsigned int);
1479
1480 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1481                         int offset, int len, icv_update_fn_t icv_update);
1482
1483 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1484                                 int family)
1485 {
1486         switch (family) {
1487         default:
1488         case AF_INET:
1489                 return (__force __u32)a->a4 - (__force __u32)b->a4;
1490         case AF_INET6:
1491                 return ipv6_addr_cmp((struct in6_addr *)a,
1492                                      (struct in6_addr *)b);
1493         }
1494 }
1495
1496 static inline int xfrm_policy_id2dir(u32 index)
1497 {
1498         return index & 7;
1499 }
1500
1501 static inline int xfrm_aevent_is_on(void)
1502 {
1503         struct sock *nlsk;
1504         int ret = 0;
1505
1506         rcu_read_lock();
1507         nlsk = rcu_dereference(xfrm_nl);
1508         if (nlsk)
1509                 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1510         rcu_read_unlock();
1511         return ret;
1512 }
1513
1514 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1515 {
1516         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1517 }
1518
1519 #ifdef CONFIG_XFRM_MIGRATE
1520 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1521 {
1522         return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1523 }
1524
1525 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1526 {
1527         int i;
1528         for (i = 0; i < n; i++)
1529                 xfrm_state_put(*(states + i));
1530 }
1531
1532 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1533 {
1534         int i;
1535         for (i = 0; i < n; i++)
1536                 xfrm_state_delete(*(states + i));
1537 }
1538 #endif
1539
1540 #ifdef CONFIG_XFRM
1541 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1542 {
1543         return skb->sp->xvec[skb->sp->len - 1];
1544 }
1545 #endif
1546
1547 #endif  /* _NET_XFRM_H */