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     secid;
 601         uid_t   loginuid;
 602         u32     sessionid;
 603 };
 604
 605 #ifdef CONFIG_AUDITSYSCALL
 606 static inline struct audit_buffer *xfrm_audit_start(const char *op)
 607 {
 608         struct audit_buffer *audit_buf = NULL;
 609
 610         if (audit_enabled == 0)
 611                 return NULL;
 612         audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
 613                                     AUDIT_MAC_IPSEC_EVENT);
 614         if (audit_buf == NULL)
 615                 return NULL;
 616         audit_log_format(audit_buf, "op=%s", op);
 617         return audit_buf;
 618 }
 619
 620 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
 621                                              struct audit_buffer *audit_buf)
 622 {
 623         char *secctx;
 624         u32 secctx_len;
 625
 626         audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
 627         if (secid != 0 &&
 628             security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
 629                 audit_log_format(audit_buf, " subj=%s", secctx);
 630                 security_release_secctx(secctx, secctx_len);
 631         } else
 632                 audit_log_task_context(audit_buf);
 633 }
 634
 635 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 636                                   u32 auid, u32 ses, u32 secid);
 637 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 638                                   u32 auid, u32 ses, u32 secid);
 639 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
 640                                  u32 auid, u32 ses, u32 secid);
 641 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 642                                     u32 auid, u32 ses, u32 secid);
 643 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 644                                              struct sk_buff *skb);
 645 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
 646 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 647                                       __be32 net_spi, __be32 net_seq);
 648 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
 649                                      struct sk_buff *skb, u8 proto);
 650 #else
 651
 652 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 653                                   u32 auid, u32 ses, u32 secid)
 654 {
 655 }
 656
 657 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 658                                   u32 auid, u32 ses, u32 secid)
 659 {
 660 }
 661
 662 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
 663                                  u32 auid, u32 ses, u32 secid)
 664 {
 665 }
 666
 667 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 668                                     u32 auid, u32 ses, u32 secid)
 669 {
 670 }
 671
 672 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 673                                              struct sk_buff *skb)
 674 {
 675 }
 676
 677 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
 678                                       u16 family)
 679 {
 680 }
 681
 682 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 683                                       __be32 net_spi, __be32 net_seq)
 684 {
 685 }
 686
 687 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
 688                                      struct sk_buff *skb, u8 proto)
 689 {
 690 }
 691 #endif /* CONFIG_AUDITSYSCALL */
 692
 693 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
 694 {
 695         if (likely(policy != NULL))
 696                 atomic_inc(&policy->refcnt);
 697 }
 698
 699 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
 700
 701 static inline void xfrm_pol_put(struct xfrm_policy *policy)
 702 {
 703         if (atomic_dec_and_test(&policy->refcnt))
 704                 xfrm_policy_destroy(policy);
 705 }
 706
 707 #ifdef CONFIG_XFRM_SUB_POLICY
 708 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 709 {
 710         int i;
 711         for (i = npols - 1; i >= 0; --i)
 712                 xfrm_pol_put(pols[i]);
 713 }
 714 #else
 715 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 716 {
 717         xfrm_pol_put(pols[0]);
 718 }
 719 #endif
 720
 721 extern void __xfrm_state_destroy(struct xfrm_state *);
 722
 723 static inline void __xfrm_state_put(struct xfrm_state *x)
 724 {
 725         atomic_dec(&x->refcnt);
 726 }
 727
 728 static inline void xfrm_state_put(struct xfrm_state *x)
 729 {
 730         if (atomic_dec_and_test(&x->refcnt))
 731                 __xfrm_state_destroy(x);
 732 }
 733
 734 static inline void xfrm_state_hold(struct xfrm_state *x)
 735 {
 736         atomic_inc(&x->refcnt);
 737 }
 738
 739 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
 740 {
 741         __be32 *a1 = token1;
 742         __be32 *a2 = token2;
 743         int pdw;
 744         int pbi;
 745
 746         pdw = prefixlen >> 5;     /* num of whole __u32 in prefix */
 747         pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
 748
 749         if (pdw)
 750                 if (memcmp(a1, a2, pdw << 2))
 751                         return 0;
 752
 753         if (pbi) {
 754                 __be32 mask;
 755
 756                 mask = htonl((0xffffffff) << (32 - pbi));
 757
 758                 if ((a1[pdw] ^ a2[pdw]) & mask)
 759                         return 0;
 760         }
 761
 762         return 1;
 763 }
 764
 765 static __inline__
 766 __be16 xfrm_flowi_sport(struct flowi *fl)
 767 {
 768         __be16 port;
 769         switch(fl->proto) {
 770         case IPPROTO_TCP:
 771         case IPPROTO_UDP:
 772         case IPPROTO_UDPLITE:
 773         case IPPROTO_SCTP:
 774                 port = fl->fl_ip_sport;
 775                 break;
 776         case IPPROTO_ICMP:
 777         case IPPROTO_ICMPV6:
 778                 port = htons(fl->fl_icmp_type);
 779                 break;
 780         case IPPROTO_MH:
 781                 port = htons(fl->fl_mh_type);
 782                 break;
 783         default:
 784                 port = 0;       /*XXX*/
 785         }
 786         return port;
 787 }
 788
 789 static __inline__
 790 __be16 xfrm_flowi_dport(struct flowi *fl)
 791 {
 792         __be16 port;
 793         switch(fl->proto) {
 794         case IPPROTO_TCP:
 795         case IPPROTO_UDP:
 796         case IPPROTO_UDPLITE:
 797         case IPPROTO_SCTP:
 798                 port = fl->fl_ip_dport;
 799                 break;
 800         case IPPROTO_ICMP:
 801         case IPPROTO_ICMPV6:
 802                 port = htons(fl->fl_icmp_code);
 803                 break;
 804         default:
 805                 port = 0;       /*XXX*/
 806         }
 807         return port;
 808 }
 809
 810 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
 811                                unsigned short family);
 812
 813 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 814 /*      If neither has a context --> match
 815  *      Otherwise, both must have a context and the sids, doi, alg must match
 816  */
 817 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 818 {
 819         return ((!s1 && !s2) ||
 820                 (s1 && s2 &&
 821                  (s1->ctx_sid == s2->ctx_sid) &&
 822                  (s1->ctx_doi == s2->ctx_doi) &&
 823                  (s1->ctx_alg == s2->ctx_alg)));
 824 }
 825 #else
 826 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 827 {
 828         return 1;
 829 }
 830 #endif
 831
 832 /* A struct encoding bundle of transformations to apply to some set of flow.
 833  *
 834  * dst->child points to the next element of bundle.
 835  * dst->xfrm  points to an instanse of transformer.
 836  *
 837  * Due to unfortunate limitations of current routing cache, which we
 838  * have no time to fix, it mirrors struct rtable and bound to the same
 839  * routing key, including saddr,daddr. However, we can have many of
 840  * bundles differing by session id. All the bundles grow from a parent
 841  * policy rule.
 842  */
 843 struct xfrm_dst
 844 {
 845         union {
 846                 struct dst_entry        dst;
 847                 struct rtable           rt;
 848                 struct rt6_info         rt6;
 849         } u;
 850         struct dst_entry *route;
 851 #ifdef CONFIG_XFRM_SUB_POLICY
 852         struct flowi *origin;
 853         struct xfrm_selector *partner;
 854 #endif
 855         u32 genid;
 856         u32 route_mtu_cached;
 857         u32 child_mtu_cached;
 858         u32 route_cookie;
 859         u32 path_cookie;
 860 };
 861
 862 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
 863 {
 864         dst_release(xdst->route);
 865         if (likely(xdst->u.dst.xfrm))
 866                 xfrm_state_put(xdst->u.dst.xfrm);
 867 #ifdef CONFIG_XFRM_SUB_POLICY
 868         kfree(xdst->origin);
 869         xdst->origin = NULL;
 870         kfree(xdst->partner);
 871         xdst->partner = NULL;
 872 #endif
 873 }
 874
 875 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
 876
 877 struct sec_path
 878 {
 879         atomic_t                refcnt;
 880         int                     len;
 881         struct xfrm_state       *xvec[XFRM_MAX_DEPTH];
 882 };
 883
 884 static inline struct sec_path *
 885 secpath_get(struct sec_path *sp)
 886 {
 887         if (sp)
 888                 atomic_inc(&sp->refcnt);
 889         return sp;
 890 }
 891
 892 extern void __secpath_destroy(struct sec_path *sp);
 893
 894 static inline void
 895 secpath_put(struct sec_path *sp)
 896 {
 897         if (sp && atomic_dec_and_test(&sp->refcnt))
 898                 __secpath_destroy(sp);
 899 }
 900
 901 extern struct sec_path *secpath_dup(struct sec_path *src);
 902
 903 static inline void
 904 secpath_reset(struct sk_buff *skb)
 905 {
 906 #ifdef CONFIG_XFRM
 907         secpath_put(skb->sp);
 908         skb->sp = NULL;
 909 #endif
 910 }
 911
 912 static inline int
 913 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
 914 {
 915         switch (family) {
 916         case AF_INET:
 917                 return addr->a4 == 0;
 918         case AF_INET6:
 919                 return ipv6_addr_any((struct in6_addr *)&addr->a6);
 920         }
 921         return 0;
 922 }
 923
 924 static inline int
 925 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 926 {
 927         return  (tmpl->saddr.a4 &&
 928                  tmpl->saddr.a4 != x->props.saddr.a4);
 929 }
 930
 931 static inline int
 932 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 933 {
 934         return  (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
 935                  ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
 936 }
 937
 938 static inline int
 939 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
 940 {
 941         switch (family) {
 942         case AF_INET:
 943                 return __xfrm4_state_addr_cmp(tmpl, x);
 944         case AF_INET6:
 945                 return __xfrm6_state_addr_cmp(tmpl, x);
 946         }
 947         return !0;
 948 }
 949
 950 #ifdef CONFIG_XFRM
 951 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
 952
 953 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
 954                                        struct sk_buff *skb,
 955                                        unsigned int family, int reverse)
 956 {
 957         int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
 958
 959         if (sk && sk->sk_policy[XFRM_POLICY_IN])
 960                 return __xfrm_policy_check(sk, ndir, skb, family);
 961
 962         return  (!xfrm_policy_count[dir] && !skb->sp) ||
 963                 (skb->dst->flags & DST_NOPOLICY) ||
 964                 __xfrm_policy_check(sk, ndir, skb, family);
 965 }
 966
 967 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
 968 {
 969         return __xfrm_policy_check2(sk, dir, skb, family, 0);
 970 }
 971
 972 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 973 {
 974         return xfrm_policy_check(sk, dir, skb, AF_INET);
 975 }
 976
 977 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 978 {
 979         return xfrm_policy_check(sk, dir, skb, AF_INET6);
 980 }
 981
 982 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
 983                                              struct sk_buff *skb)
 984 {
 985         return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
 986 }
 987
 988 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
 989                                              struct sk_buff *skb)
 990 {
 991         return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
 992 }
 993
 994 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
 995                                  unsigned int family, int reverse);
 996
 997 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
 998                                       unsigned int family)
 999 {
1000         return __xfrm_decode_session(skb, fl, family, 0);
1001 }
1002
1003 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1004                                               struct flowi *fl,
1005                                               unsigned int family)
1006 {
1007         return __xfrm_decode_session(skb, fl, family, 1);
1008 }
1009
1010 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1011
1012 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1013 {
1014         return  !xfrm_policy_count[XFRM_POLICY_OUT] ||
1015                 (skb->dst->flags & DST_NOXFRM) ||
1016                 __xfrm_route_forward(skb, family);
1017 }
1018
1019 static inline int xfrm4_route_forward(struct sk_buff *skb)
1020 {
1021         return xfrm_route_forward(skb, AF_INET);
1022 }
1023
1024 static inline int xfrm6_route_forward(struct sk_buff *skb)
1025 {
1026         return xfrm_route_forward(skb, AF_INET6);
1027 }
1028
1029 extern int __xfrm_sk_clone_policy(struct sock *sk);
1030
1031 static inline int xfrm_sk_clone_policy(struct sock *sk)
1032 {
1033         if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1034                 return __xfrm_sk_clone_policy(sk);
1035         return 0;
1036 }
1037
1038 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1039
1040 static inline void xfrm_sk_free_policy(struct sock *sk)
1041 {
1042         if (unlikely(sk->sk_policy[0] != NULL)) {
1043                 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1044                 sk->sk_policy[0] = NULL;
1045         }
1046         if (unlikely(sk->sk_policy[1] != NULL)) {
1047                 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1048                 sk->sk_policy[1] = NULL;
1049         }
1050 }
1051
1052 #else
1053
1054 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1055 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1056 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1057 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1058 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1059 {
1060         return 1;
1061 }
1062 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1063 {
1064         return 1;
1065 }
1066 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1067 {
1068         return 1;
1069 }
1070 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1071                                               struct flowi *fl,
1072                                               unsigned int family)
1073 {
1074         return -ENOSYS;
1075 }
1076 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1077                                              struct sk_buff *skb)
1078 {
1079         return 1;
1080 }
1081 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1082                                              struct sk_buff *skb)
1083 {
1084         return 1;
1085 }
1086 #endif
1087
1088 static __inline__
1089 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1090 {
1091         switch (family){
1092         case AF_INET:
1093                 return (xfrm_address_t *)&fl->fl4_dst;
1094         case AF_INET6:
1095                 return (xfrm_address_t *)&fl->fl6_dst;
1096         }
1097         return NULL;
1098 }
1099
1100 static __inline__
1101 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1102 {
1103         switch (family){
1104         case AF_INET:
1105                 return (xfrm_address_t *)&fl->fl4_src;
1106         case AF_INET6:
1107                 return (xfrm_address_t *)&fl->fl6_src;
1108         }
1109         return NULL;
1110 }
1111
1112 static __inline__
1113 void xfrm_flowi_addr_get(struct flowi *fl,
1114                          xfrm_address_t *saddr, xfrm_address_t *daddr,
1115                          unsigned short family)
1116 {
1117         switch(family) {
1118         case AF_INET:
1119                 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1120                 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1121                 break;
1122         case AF_INET6:
1123                 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1124                 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1125                 break;
1126         }
1127 }
1128
1129 static __inline__ int
1130 __xfrm4_state_addr_check(struct xfrm_state *x,
1131                          xfrm_address_t *daddr, xfrm_address_t *saddr)
1132 {
1133         if (daddr->a4 == x->id.daddr.a4 &&
1134             (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1135                 return 1;
1136         return 0;
1137 }
1138
1139 static __inline__ int
1140 __xfrm6_state_addr_check(struct xfrm_state *x,
1141                          xfrm_address_t *daddr, xfrm_address_t *saddr)
1142 {
1143         if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1144             (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1145              ipv6_addr_any((struct in6_addr *)saddr) ||
1146              ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1147                 return 1;
1148         return 0;
1149 }
1150
1151 static __inline__ int
1152 xfrm_state_addr_check(struct xfrm_state *x,
1153                       xfrm_address_t *daddr, xfrm_address_t *saddr,
1154                       unsigned short family)
1155 {
1156         switch (family) {
1157         case AF_INET:
1158                 return __xfrm4_state_addr_check(x, daddr, saddr);
1159         case AF_INET6:
1160                 return __xfrm6_state_addr_check(x, daddr, saddr);
1161         }
1162         return 0;
1163 }
1164
1165 static __inline__ int
1166 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1167                            unsigned short family)
1168 {
1169         switch (family) {
1170         case AF_INET:
1171                 return __xfrm4_state_addr_check(x,
1172                                                 (xfrm_address_t *)&fl->fl4_dst,
1173                                                 (xfrm_address_t *)&fl->fl4_src);
1174         case AF_INET6:
1175                 return __xfrm6_state_addr_check(x,
1176                                                 (xfrm_address_t *)&fl->fl6_dst,
1177                                                 (xfrm_address_t *)&fl->fl6_src);
1178         }
1179         return 0;
1180 }
1181
1182 static inline int xfrm_state_kern(struct xfrm_state *x)
1183 {
1184         return atomic_read(&x->tunnel_users);
1185 }
1186
1187 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1188 {
1189         return (!userproto || proto == userproto ||
1190                 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1191                                                   proto == IPPROTO_ESP ||
1192                                                   proto == IPPROTO_COMP)));
1193 }
1194
1195 /*
1196  * xfrm algorithm information
1197  */
1198 struct xfrm_algo_aead_info {
1199         u16 icv_truncbits;
1200 };
1201
1202 struct xfrm_algo_auth_info {
1203         u16 icv_truncbits;
1204         u16 icv_fullbits;
1205 };
1206
1207 struct xfrm_algo_encr_info {
1208         u16 blockbits;
1209         u16 defkeybits;
1210 };
1211
1212 struct xfrm_algo_comp_info {
1213         u16 threshold;
1214 };
1215
1216 struct xfrm_algo_desc {
1217         char *name;
1218         char *compat;
1219         u8 available:1;
1220         union {
1221                 struct xfrm_algo_aead_info aead;
1222                 struct xfrm_algo_auth_info auth;
1223                 struct xfrm_algo_encr_info encr;
1224                 struct xfrm_algo_comp_info comp;
1225         } uinfo;
1226         struct sadb_alg desc;
1227 };
1228
1229 /* XFRM tunnel handlers.  */
1230 struct xfrm_tunnel {
1231         int (*handler)(struct sk_buff *skb);
1232         int (*err_handler)(struct sk_buff *skb, __u32 info);
1233
1234         struct xfrm_tunnel *next;
1235         int priority;
1236 };
1237
1238 struct xfrm6_tunnel {
1239         int (*handler)(struct sk_buff *skb);
1240         int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1241                            int type, int code, int offset, __be32 info);
1242         struct xfrm6_tunnel *next;
1243         int priority;
1244 };
1245
1246 struct xfrm_state_walk {
1247         struct xfrm_state *state;
1248         int count;
1249         u8 proto;
1250 };
1251
1252 struct xfrm_policy_walk {
1253         struct xfrm_policy *policy;
1254         int count;
1255         u8 type, cur_type;
1256 };
1257
1258 extern void xfrm_init(void);
1259 extern void xfrm4_init(void);
1260 extern void xfrm_state_init(void);
1261 extern void xfrm4_state_init(void);
1262 #ifdef CONFIG_XFRM
1263 extern int xfrm6_init(void);
1264 extern void xfrm6_fini(void);
1265 extern int xfrm6_state_init(void);
1266 extern void xfrm6_state_fini(void);
1267 #else
1268 static inline int xfrm6_init(void)
1269 {
1270         return 0;
1271 }
1272 static inline void xfrm6_fini(void)
1273 {
1274         ;
1275 }
1276 #endif
1277
1278 #ifdef CONFIG_XFRM_STATISTICS
1279 extern int xfrm_proc_init(void);
1280 #endif
1281
1282 static inline void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto)
1283 {
1284         walk->proto = proto;
1285         walk->state = NULL;
1286         walk->count = 0;
1287 }
1288
1289 static inline void xfrm_state_walk_done(struct xfrm_state_walk *walk)
1290 {
1291         if (walk->state != NULL) {
1292                 xfrm_state_put(walk->state);
1293                 walk->state = NULL;
1294         }
1295 }
1296
1297 extern int xfrm_state_walk(struct xfrm_state_walk *walk,
1298                            int (*func)(struct xfrm_state *, int, void*), void *);
1299 extern struct xfrm_state *xfrm_state_alloc(void);
1300 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1301                                           struct flowi *fl, struct xfrm_tmpl *tmpl,
1302                                           struct xfrm_policy *pol, int *err,
1303                                           unsigned short family);
1304 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1305                                                xfrm_address_t *saddr,
1306                                                unsigned short family,
1307                                                u8 mode, u8 proto, u32 reqid);
1308 extern int xfrm_state_check_expire(struct xfrm_state *x);
1309 extern void xfrm_state_insert(struct xfrm_state *x);
1310 extern int xfrm_state_add(struct xfrm_state *x);
1311 extern int xfrm_state_update(struct xfrm_state *x);
1312 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1313 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1314 #ifdef CONFIG_XFRM_SUB_POLICY
1315 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1316                           int n, unsigned short family);
1317 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1318                            int n, unsigned short family);
1319 #else
1320 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1321                                  int n, unsigned short family)
1322 {
1323         return -ENOSYS;
1324 }
1325
1326 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1327                                   int n, unsigned short family)
1328 {
1329         return -ENOSYS;
1330 }
1331 #endif
1332
1333 struct xfrmk_sadinfo {
1334         u32 sadhcnt; /* current hash bkts */
1335         u32 sadhmcnt; /* max allowed hash bkts */
1336         u32 sadcnt; /* current running count */
1337 };
1338
1339 struct xfrmk_spdinfo {
1340         u32 incnt;
1341         u32 outcnt;
1342         u32 fwdcnt;
1343         u32 inscnt;
1344         u32 outscnt;
1345         u32 fwdscnt;
1346         u32 spdhcnt;
1347         u32 spdhmcnt;
1348 };
1349
1350 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1351 extern int xfrm_state_delete(struct xfrm_state *x);
1352 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1353 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1354 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1355 extern int xfrm_replay_check(struct xfrm_state *x,
1356                              struct sk_buff *skb, __be32 seq);
1357 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1358 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1359 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1360 extern int xfrm_init_state(struct xfrm_state *x);
1361 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1362 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1363                       int encap_type);
1364 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1365 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1366 extern int xfrm_output(struct sk_buff *skb);
1367 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1368 extern int xfrm4_extract_header(struct sk_buff *skb);
1369 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1370 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1371                            int encap_type);
1372 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1373 extern int xfrm4_rcv(struct sk_buff *skb);
1374
1375 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1376 {
1377         return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1378 }
1379
1380 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1381 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1382 extern int xfrm4_output(struct sk_buff *skb);
1383 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1384 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1385 extern int xfrm6_extract_header(struct sk_buff *skb);
1386 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1387 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1388 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1389 extern int xfrm6_rcv(struct sk_buff *skb);
1390 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1391                             xfrm_address_t *saddr, u8 proto);
1392 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1393 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1394 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1395 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1396 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1397 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1398 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1399 extern int xfrm6_output(struct sk_buff *skb);
1400 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1401                                  u8 **prevhdr);
1402
1403 #ifdef CONFIG_XFRM
1404 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1405 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1406 #else
1407 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1408 {
1409         return -ENOPROTOOPT;
1410 }
1411
1412 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1413 {
1414         /* should not happen */
1415         kfree_skb(skb);
1416         return 0;
1417 }
1418 #endif
1419
1420 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1421
1422 static inline void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
1423 {
1424         walk->cur_type = XFRM_POLICY_TYPE_MAIN;
1425         walk->type = type;
1426         walk->policy = NULL;
1427         walk->count = 0;
1428 }
1429
1430 static inline void xfrm_policy_walk_done(struct xfrm_policy_walk *walk)
1431 {
1432         if (walk->policy != NULL) {
1433                 xfrm_pol_put(walk->policy);
1434                 walk->policy = NULL;
1435         }
1436 }
1437
1438 extern int xfrm_policy_walk(struct xfrm_policy_walk *walk,
1439         int (*func)(struct xfrm_policy *, int, int, void*), void *);
1440 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1441 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1442                                           struct xfrm_selector *sel,
1443                                           struct xfrm_sec_ctx *ctx, int delete,
1444                                           int *err);
1445 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1446 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1447 u32 xfrm_get_acqseq(void);
1448 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1449 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1450                                   xfrm_address_t *daddr, xfrm_address_t *saddr,
1451                                   int create, unsigned short family);
1452 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1453 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1454                           struct flowi *fl, int family, int strict);
1455
1456 #ifdef CONFIG_XFRM_MIGRATE
1457 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1458                       struct xfrm_migrate *m, int num_bundles);
1459 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1460 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1461                                               struct xfrm_migrate *m);
1462 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1463                         struct xfrm_migrate *m, int num_bundles);
1464 #endif
1465
1466 extern wait_queue_head_t km_waitq;
1467 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1468 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1469 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1470
1471 extern void xfrm_input_init(void);
1472 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1473
1474 extern void xfrm_probe_algs(void);
1475 extern int xfrm_count_auth_supported(void);
1476 extern int xfrm_count_enc_supported(void);
1477 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1478 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1479 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1480 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1481 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1482 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1483 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1484 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1485 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1486                                                    int probe);
1487
1488 struct hash_desc;
1489 struct scatterlist;
1490 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1491                               unsigned int);
1492
1493 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1494                         int offset, int len, icv_update_fn_t icv_update);
1495
1496 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1497                                 int family)
1498 {
1499         switch (family) {
1500         default:
1501         case AF_INET:
1502                 return (__force __u32)a->a4 - (__force __u32)b->a4;
1503         case AF_INET6:
1504                 return ipv6_addr_cmp((struct in6_addr *)a,
1505                                      (struct in6_addr *)b);
1506         }
1507 }
1508
1509 static inline int xfrm_policy_id2dir(u32 index)
1510 {
1511         return index & 7;
1512 }
1513
1514 static inline int xfrm_aevent_is_on(void)
1515 {
1516         struct sock *nlsk;
1517         int ret = 0;
1518
1519         rcu_read_lock();
1520         nlsk = rcu_dereference(xfrm_nl);
1521         if (nlsk)
1522                 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1523         rcu_read_unlock();
1524         return ret;
1525 }
1526
1527 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1528 {
1529         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1530 }
1531
1532 #ifdef CONFIG_XFRM_MIGRATE
1533 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1534 {
1535         return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1536 }
1537
1538 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1539 {
1540         int i;
1541         for (i = 0; i < n; i++)
1542                 xfrm_state_put(*(states + i));
1543 }
1544
1545 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1546 {
1547         int i;
1548         for (i = 0; i < n; i++)
1549                 xfrm_state_delete(*(states + i));
1550 }
1551 #endif
1552
1553 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1554 {
1555         return skb->sp->xvec[skb->sp->len - 1];
1556 }
1557
1558 #endif  /* _NET_XFRM_H */