include/net/xfrm.h

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