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