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