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