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 struct xfrm_state_walk {
 121         struct list_head        all;
 122         u8                      state;
 123         union {
 124                 u8              dying;
 125                 u8              proto;
 126         };
 127         u32                     seq;
 128 };
 129
 130 /* Full description of state of transformer. */
 131 struct xfrm_state
 132 {
 133         union {
 134                 struct hlist_node       gclist;
 135                 struct hlist_node       bydst;
 136         };
 137         struct hlist_node       bysrc;
 138         struct hlist_node       byspi;
 139
 140         atomic_t                refcnt;
 141         spinlock_t              lock;
 142
 143         struct xfrm_id          id;
 144         struct xfrm_selector    sel;
 145
 146         u32                     genid;
 147
 148         /* Key manager bits */
 149         struct xfrm_state_walk  km;
 150
 151         /* Parameters of this state. */
 152         struct {
 153                 u32             reqid;
 154                 u8              mode;
 155                 u8              replay_window;
 156                 u8              aalgo, ealgo, calgo;
 157                 u8              flags;
 158                 u16             family;
 159                 xfrm_address_t  saddr;
 160                 int             header_len;
 161                 int             trailer_len;
 162         } props;
 163
 164         struct xfrm_lifetime_cfg lft;
 165
 166         /* Data for transformer */
 167         struct xfrm_algo        *aalg;
 168         struct xfrm_algo        *ealg;
 169         struct xfrm_algo        *calg;
 170         struct xfrm_algo_aead   *aead;
 171
 172         /* Data for encapsulator */
 173         struct xfrm_encap_tmpl  *encap;
 174
 175         /* Data for care-of address */
 176         xfrm_address_t  *coaddr;
 177
 178         /* IPComp needs an IPIP tunnel for handling uncompressed packets */
 179         struct xfrm_state       *tunnel;
 180
 181         /* If a tunnel, number of users + 1 */
 182         atomic_t                tunnel_users;
 183
 184         /* State for replay detection */
 185         struct xfrm_replay_state replay;
 186
 187         /* Replay detection state at the time we sent the last notification */
 188         struct xfrm_replay_state preplay;
 189
 190         /* internal flag that only holds state for delayed aevent at the
 191          * moment
 192         */
 193         u32                     xflags;
 194
 195         /* Replay detection notification settings */
 196         u32                     replay_maxage;
 197         u32                     replay_maxdiff;
 198
 199         /* Replay detection notification timer */
 200         struct timer_list       rtimer;
 201
 202         /* Statistics */
 203         struct xfrm_stats       stats;
 204
 205         struct xfrm_lifetime_cur curlft;
 206         struct timer_list       timer;
 207
 208         /* Last used time */
 209         unsigned long           lastused;
 210
 211         /* Reference to data common to all the instances of this
 212          * transformer. */
 213         const struct xfrm_type  *type;
 214         struct xfrm_mode        *inner_mode;
 215         struct xfrm_mode        *inner_mode_iaf;
 216         struct xfrm_mode        *outer_mode;
 217
 218         /* Security context */
 219         struct xfrm_sec_ctx     *security;
 220
 221         /* Private data of this transformer, format is opaque,
 222          * interpreted by xfrm_type methods. */
 223         void                    *data;
 224 };
 225
 226 /* xflags - make enum if more show up */
 227 #define XFRM_TIME_DEFER 1
 228
 229 enum {
 230         XFRM_STATE_VOID,
 231         XFRM_STATE_ACQ,
 232         XFRM_STATE_VALID,
 233         XFRM_STATE_ERROR,
 234         XFRM_STATE_EXPIRED,
 235         XFRM_STATE_DEAD
 236 };
 237
 238 /* callback structure passed from either netlink or pfkey */
 239 struct km_event
 240 {
 241         union {
 242                 u32 hard;
 243                 u32 proto;
 244                 u32 byid;
 245                 u32 aevent;
 246                 u32 type;
 247         } data;
 248
 249         u32     seq;
 250         u32     pid;
 251         u32     event;
 252 };
 253
 254 struct net_device;
 255 struct xfrm_type;
 256 struct xfrm_dst;
 257 struct xfrm_policy_afinfo {
 258         unsigned short          family;
 259         struct dst_ops          *dst_ops;
 260         void                    (*garbage_collect)(void);
 261         struct dst_entry        *(*dst_lookup)(int tos, xfrm_address_t *saddr,
 262                                                xfrm_address_t *daddr);
 263         int                     (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
 264         struct dst_entry        *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
 265         void                    (*decode_session)(struct sk_buff *skb,
 266                                                   struct flowi *fl,
 267                                                   int reverse);
 268         int                     (*get_tos)(struct flowi *fl);
 269         int                     (*init_path)(struct xfrm_dst *path,
 270                                              struct dst_entry *dst,
 271                                              int nfheader_len);
 272         int                     (*fill_dst)(struct xfrm_dst *xdst,
 273                                             struct net_device *dev);
 274 };
 275
 276 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
 277 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
 278 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
 279 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
 280
 281 struct xfrm_tmpl;
 282 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
 283 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
 284 extern int __xfrm_state_delete(struct xfrm_state *x);
 285
 286 struct xfrm_state_afinfo {
 287         unsigned int            family;
 288         unsigned int            proto;
 289         __be16                  eth_proto;
 290         struct module           *owner;
 291         const struct xfrm_type  *type_map[IPPROTO_MAX];
 292         struct xfrm_mode        *mode_map[XFRM_MODE_MAX];
 293         int                     (*init_flags)(struct xfrm_state *x);
 294         void                    (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
 295                                                 struct xfrm_tmpl *tmpl,
 296                                                 xfrm_address_t *daddr, xfrm_address_t *saddr);
 297         int                     (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
 298         int                     (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
 299         int                     (*output)(struct sk_buff *skb);
 300         int                     (*extract_input)(struct xfrm_state *x,
 301                                                  struct sk_buff *skb);
 302         int                     (*extract_output)(struct xfrm_state *x,
 303                                                   struct sk_buff *skb);
 304         int                     (*transport_finish)(struct sk_buff *skb,
 305                                                     int async);
 306 };
 307
 308 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
 309 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
 310
 311 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
 312
 313 struct xfrm_type
 314 {
 315         char                    *description;
 316         struct module           *owner;
 317         __u8                    proto;
 318         __u8                    flags;
 319 #define XFRM_TYPE_NON_FRAGMENT  1
 320 #define XFRM_TYPE_REPLAY_PROT   2
 321 #define XFRM_TYPE_LOCAL_COADDR  4
 322 #define XFRM_TYPE_REMOTE_COADDR 8
 323
 324         int                     (*init_state)(struct xfrm_state *x);
 325         void                    (*destructor)(struct xfrm_state *);
 326         int                     (*input)(struct xfrm_state *, struct sk_buff *skb);
 327         int                     (*output)(struct xfrm_state *, struct sk_buff *pskb);
 328         int                     (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
 329         int                     (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
 330         /* Estimate maximal size of result of transformation of a dgram */
 331         u32                     (*get_mtu)(struct xfrm_state *, int size);
 332 };
 333
 334 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
 335 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
 336
 337 struct xfrm_mode {
 338         /*
 339          * Remove encapsulation header.
 340          *
 341          * The IP header will be moved over the top of the encapsulation
 342          * header.
 343          *
 344          * On entry, the transport header shall point to where the IP header
 345          * should be and the network header shall be set to where the IP
 346          * header currently is.  skb->data shall point to the start of the
 347          * payload.
 348          */
 349         int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
 350
 351         /*
 352          * This is the actual input entry point.
 353          *
 354          * For transport mode and equivalent this would be identical to
 355          * input2 (which does not need to be set).  While tunnel mode
 356          * and equivalent would set this to the tunnel encapsulation function
 357          * xfrm4_prepare_input that would in turn call input2.
 358          */
 359         int (*input)(struct xfrm_state *x, struct sk_buff *skb);
 360
 361         /*
 362          * Add encapsulation header.
 363          *
 364          * On exit, the transport header will be set to the start of the
 365          * encapsulation header to be filled in by x->type->output and
 366          * the mac header will be set to the nextheader (protocol for
 367          * IPv4) field of the extension header directly preceding the
 368          * encapsulation header, or in its absence, that of the top IP
 369          * header.  The value of the network header will always point
 370          * to the top IP header while skb->data will point to the payload.
 371          */
 372         int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
 373
 374         /*
 375          * This is the actual output entry point.
 376          *
 377          * For transport mode and equivalent this would be identical to
 378          * output2 (which does not need to be set).  While tunnel mode
 379          * and equivalent would set this to a tunnel encapsulation function
 380          * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
 381          * call output2.
 382          */
 383         int (*output)(struct xfrm_state *x, struct sk_buff *skb);
 384
 385         struct xfrm_state_afinfo *afinfo;
 386         struct module *owner;
 387         unsigned int encap;
 388         int flags;
 389 };
 390
 391 /* Flags for xfrm_mode. */
 392 enum {
 393         XFRM_MODE_FLAG_TUNNEL = 1,
 394 };
 395
 396 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
 397 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
 398
 399 static inline int xfrm_af2proto(unsigned int family)
 400 {
 401         switch(family) {
 402         case AF_INET:
 403                 return IPPROTO_IPIP;
 404         case AF_INET6:
 405                 return IPPROTO_IPV6;
 406         default:
 407                 return 0;
 408         }
 409 }
 410
 411 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
 412 {
 413         if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
 414             (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
 415                 return x->inner_mode;
 416         else
 417                 return x->inner_mode_iaf;
 418 }
 419
 420 struct xfrm_tmpl
 421 {
 422 /* id in template is interpreted as:
 423  * daddr - destination of tunnel, may be zero for transport mode.
 424  * spi   - zero to acquire spi. Not zero if spi is static, then
 425  *         daddr must be fixed too.
 426  * proto - AH/ESP/IPCOMP
 427  */
 428         struct xfrm_id          id;
 429
 430 /* Source address of tunnel. Ignored, if it is not a tunnel. */
 431         xfrm_address_t          saddr;
 432
 433         unsigned short          encap_family;
 434
 435         __u32                   reqid;
 436
 437 /* Mode: transport, tunnel etc. */
 438         __u8                    mode;
 439
 440 /* Sharing mode: unique, this session only, this user only etc. */
 441         __u8                    share;
 442
 443 /* May skip this transfomration if no SA is found */
 444         __u8                    optional;
 445
 446 /* Skip aalgos/ealgos/calgos checks. */
 447         __u8                    allalgs;
 448
 449 /* Bit mask of algos allowed for acquisition */
 450         __u32                   aalgos;
 451         __u32                   ealgos;
 452         __u32                   calgos;
 453 };
 454
 455 #define XFRM_MAX_DEPTH          6
 456
 457 struct xfrm_policy_walk_entry {
 458         struct list_head        all;
 459         u8                      dead;
 460 };
 461
 462 struct xfrm_policy_walk {
 463         struct xfrm_policy_walk_entry walk;
 464         u8 type;
 465         u32 seq;
 466 };
 467
 468 struct xfrm_policy
 469 {
 470         struct xfrm_policy      *next;
 471         struct hlist_node       bydst;
 472         struct hlist_node       byidx;
 473
 474         /* This lock only affects elements except for entry. */
 475         rwlock_t                lock;
 476         atomic_t                refcnt;
 477         struct timer_list       timer;
 478
 479         u32                     priority;
 480         u32                     index;
 481         struct xfrm_selector    selector;
 482         struct xfrm_lifetime_cfg lft;
 483         struct xfrm_lifetime_cur curlft;
 484         struct dst_entry       *bundles;
 485         struct xfrm_policy_walk_entry walk;
 486         u8                      type;
 487         u8                      action;
 488         u8                      flags;
 489         u8                      xfrm_nr;
 490         u16                     family;
 491         struct xfrm_sec_ctx     *security;
 492         struct xfrm_tmpl        xfrm_vec[XFRM_MAX_DEPTH];
 493 };
 494
 495 struct xfrm_kmaddress {
 496         xfrm_address_t          local;
 497         xfrm_address_t          remote;
 498         u32                     reserved;
 499         u16                     family;
 500 };
 501
 502 struct xfrm_migrate {
 503         xfrm_address_t          old_daddr;
 504         xfrm_address_t          old_saddr;
 505         xfrm_address_t          new_daddr;
 506         xfrm_address_t          new_saddr;
 507         u8                      proto;
 508         u8                      mode;
 509         u16                     reserved;
 510         u32                     reqid;
 511         u16                     old_family;
 512         u16                     new_family;
 513 };
 514
 515 #define XFRM_KM_TIMEOUT                30
 516 /* which seqno */
 517 #define XFRM_REPLAY_SEQ         1
 518 #define XFRM_REPLAY_OSEQ        2
 519 #define XFRM_REPLAY_SEQ_MASK    3
 520 /* what happened */
 521 #define XFRM_REPLAY_UPDATE      XFRM_AE_CR
 522 #define XFRM_REPLAY_TIMEOUT     XFRM_AE_CE
 523
 524 /* default aevent timeout in units of 100ms */
 525 #define XFRM_AE_ETIME                   10
 526 /* Async Event timer multiplier */
 527 #define XFRM_AE_ETH_M                   10
 528 /* default seq threshold size */
 529 #define XFRM_AE_SEQT_SIZE               2
 530
 531 struct xfrm_mgr
 532 {
 533         struct list_head        list;
 534         char                    *id;
 535         int                     (*notify)(struct xfrm_state *x, struct km_event *c);
 536         int                     (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
 537         struct xfrm_policy      *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
 538         int                     (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
 539         int                     (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
 540         int                     (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
 541         int                     (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
 542 };
 543
 544 extern int xfrm_register_km(struct xfrm_mgr *km);
 545 extern int xfrm_unregister_km(struct xfrm_mgr *km);
 546
 547 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
 548
 549 /*
 550  * This structure is used for the duration where packets are being
 551  * transformed by IPsec.  As soon as the packet leaves IPsec the
 552  * area beyond the generic IP part may be overwritten.
 553  */
 554 struct xfrm_skb_cb {
 555         union {
 556                 struct inet_skb_parm h4;
 557                 struct inet6_skb_parm h6;
 558         } header;
 559
 560         /* Sequence number for replay protection. */
 561         union {
 562                 u64 output;
 563                 __be32 input;
 564         } seq;
 565 };
 566
 567 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
 568
 569 /*
 570  * This structure is used by the afinfo prepare_input/prepare_output functions
 571  * to transmit header information to the mode input/output functions.
 572  */
 573 struct xfrm_mode_skb_cb {
 574         union {
 575                 struct inet_skb_parm h4;
 576                 struct inet6_skb_parm h6;
 577         } header;
 578
 579         /* Copied from header for IPv4, always set to zero and DF for IPv6. */
 580         __be16 id;
 581         __be16 frag_off;
 582
 583         /* IP header length (excluding options or extension headers). */
 584         u8 ihl;
 585
 586         /* TOS for IPv4, class for IPv6. */
 587         u8 tos;
 588
 589         /* TTL for IPv4, hop limitfor IPv6. */
 590         u8 ttl;
 591
 592         /* Protocol for IPv4, NH for IPv6. */
 593         u8 protocol;
 594
 595         /* Option length for IPv4, zero for IPv6. */
 596         u8 optlen;
 597
 598         /* Used by IPv6 only, zero for IPv4. */
 599         u8 flow_lbl[3];
 600 };
 601
 602 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
 603
 604 /*
 605  * This structure is used by the input processing to locate the SPI and
 606  * related information.
 607  */
 608 struct xfrm_spi_skb_cb {
 609         union {
 610                 struct inet_skb_parm h4;
 611                 struct inet6_skb_parm h6;
 612         } header;
 613
 614         unsigned int daddroff;
 615         unsigned int family;
 616 };
 617
 618 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
 619
 620 /* Audit Information */
 621 struct xfrm_audit
 622 {
 623         u32     secid;
 624         uid_t   loginuid;
 625         u32     sessionid;
 626 };
 627
 628 #ifdef CONFIG_AUDITSYSCALL
 629 static inline struct audit_buffer *xfrm_audit_start(const char *op)
 630 {
 631         struct audit_buffer *audit_buf = NULL;
 632
 633         if (audit_enabled == 0)
 634                 return NULL;
 635         audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
 636                                     AUDIT_MAC_IPSEC_EVENT);
 637         if (audit_buf == NULL)
 638                 return NULL;
 639         audit_log_format(audit_buf, "op=%s", op);
 640         return audit_buf;
 641 }
 642
 643 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
 644                                              struct audit_buffer *audit_buf)
 645 {
 646         char *secctx;
 647         u32 secctx_len;
 648
 649         audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
 650         if (secid != 0 &&
 651             security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
 652                 audit_log_format(audit_buf, " subj=%s", secctx);
 653                 security_release_secctx(secctx, secctx_len);
 654         } else
 655                 audit_log_task_context(audit_buf);
 656 }
 657
 658 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 659                                   u32 auid, u32 ses, u32 secid);
 660 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 661                                   u32 auid, u32 ses, u32 secid);
 662 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
 663                                  u32 auid, u32 ses, u32 secid);
 664 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 665                                     u32 auid, u32 ses, u32 secid);
 666 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 667                                              struct sk_buff *skb);
 668 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
 669 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 670                                       __be32 net_spi, __be32 net_seq);
 671 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
 672                                      struct sk_buff *skb, u8 proto);
 673 #else
 674
 675 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 676                                   u32 auid, u32 ses, u32 secid)
 677 {
 678 }
 679
 680 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 681                                   u32 auid, u32 ses, u32 secid)
 682 {
 683 }
 684
 685 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
 686                                  u32 auid, u32 ses, u32 secid)
 687 {
 688 }
 689
 690 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 691                                     u32 auid, u32 ses, u32 secid)
 692 {
 693 }
 694
 695 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 696                                              struct sk_buff *skb)
 697 {
 698 }
 699
 700 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
 701                                       u16 family)
 702 {
 703 }
 704
 705 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 706                                       __be32 net_spi, __be32 net_seq)
 707 {
 708 }
 709
 710 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
 711                                      struct sk_buff *skb, u8 proto)
 712 {
 713 }
 714 #endif /* CONFIG_AUDITSYSCALL */
 715
 716 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
 717 {
 718         if (likely(policy != NULL))
 719                 atomic_inc(&policy->refcnt);
 720 }
 721
 722 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
 723
 724 static inline void xfrm_pol_put(struct xfrm_policy *policy)
 725 {
 726         if (atomic_dec_and_test(&policy->refcnt))
 727                 xfrm_policy_destroy(policy);
 728 }
 729
 730 #ifdef CONFIG_XFRM_SUB_POLICY
 731 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 732 {
 733         int i;
 734         for (i = npols - 1; i >= 0; --i)
 735                 xfrm_pol_put(pols[i]);
 736 }
 737 #else
 738 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 739 {
 740         xfrm_pol_put(pols[0]);
 741 }
 742 #endif
 743
 744 extern void __xfrm_state_destroy(struct xfrm_state *);
 745
 746 static inline void __xfrm_state_put(struct xfrm_state *x)
 747 {
 748         atomic_dec(&x->refcnt);
 749 }
 750
 751 static inline void xfrm_state_put(struct xfrm_state *x)
 752 {
 753         if (atomic_dec_and_test(&x->refcnt))
 754                 __xfrm_state_destroy(x);
 755 }
 756
 757 static inline void xfrm_state_hold(struct xfrm_state *x)
 758 {
 759         atomic_inc(&x->refcnt);
 760 }
 761
 762 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
 763 {
 764         __be32 *a1 = token1;
 765         __be32 *a2 = token2;
 766         int pdw;
 767         int pbi;
 768
 769         pdw = prefixlen >> 5;     /* num of whole __u32 in prefix */
 770         pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
 771
 772         if (pdw)
 773                 if (memcmp(a1, a2, pdw << 2))
 774                         return 0;
 775
 776         if (pbi) {
 777                 __be32 mask;
 778
 779                 mask = htonl((0xffffffff) << (32 - pbi));
 780
 781                 if ((a1[pdw] ^ a2[pdw]) & mask)
 782                         return 0;
 783         }
 784
 785         return 1;
 786 }
 787
 788 static __inline__
 789 __be16 xfrm_flowi_sport(struct flowi *fl)
 790 {
 791         __be16 port;
 792         switch(fl->proto) {
 793         case IPPROTO_TCP:
 794         case IPPROTO_UDP:
 795         case IPPROTO_UDPLITE:
 796         case IPPROTO_SCTP:
 797                 port = fl->fl_ip_sport;
 798                 break;
 799         case IPPROTO_ICMP:
 800         case IPPROTO_ICMPV6:
 801                 port = htons(fl->fl_icmp_type);
 802                 break;
 803         case IPPROTO_MH:
 804                 port = htons(fl->fl_mh_type);
 805                 break;
 806         default:
 807                 port = 0;       /*XXX*/
 808         }
 809         return port;
 810 }
 811
 812 static __inline__
 813 __be16 xfrm_flowi_dport(struct flowi *fl)
 814 {
 815         __be16 port;
 816         switch(fl->proto) {
 817         case IPPROTO_TCP:
 818         case IPPROTO_UDP:
 819         case IPPROTO_UDPLITE:
 820         case IPPROTO_SCTP:
 821                 port = fl->fl_ip_dport;
 822                 break;
 823         case IPPROTO_ICMP:
 824         case IPPROTO_ICMPV6:
 825                 port = htons(fl->fl_icmp_code);
 826                 break;
 827         default:
 828                 port = 0;       /*XXX*/
 829         }
 830         return port;
 831 }
 832
 833 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
 834                                unsigned short family);
 835
 836 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 837 /*      If neither has a context --> match
 838  *      Otherwise, both must have a context and the sids, doi, alg must match
 839  */
 840 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 841 {
 842         return ((!s1 && !s2) ||
 843                 (s1 && s2 &&
 844                  (s1->ctx_sid == s2->ctx_sid) &&
 845                  (s1->ctx_doi == s2->ctx_doi) &&
 846                  (s1->ctx_alg == s2->ctx_alg)));
 847 }
 848 #else
 849 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 850 {
 851         return 1;
 852 }
 853 #endif
 854
 855 /* A struct encoding bundle of transformations to apply to some set of flow.
 856  *
 857  * dst->child points to the next element of bundle.
 858  * dst->xfrm  points to an instanse of transformer.
 859  *
 860  * Due to unfortunate limitations of current routing cache, which we
 861  * have no time to fix, it mirrors struct rtable and bound to the same
 862  * routing key, including saddr,daddr. However, we can have many of
 863  * bundles differing by session id. All the bundles grow from a parent
 864  * policy rule.
 865  */
 866 struct xfrm_dst
 867 {
 868         union {
 869                 struct dst_entry        dst;
 870                 struct rtable           rt;
 871                 struct rt6_info         rt6;
 872         } u;
 873         struct dst_entry *route;
 874 #ifdef CONFIG_XFRM_SUB_POLICY
 875         struct flowi *origin;
 876         struct xfrm_selector *partner;
 877 #endif
 878         u32 genid;
 879         u32 route_mtu_cached;
 880         u32 child_mtu_cached;
 881         u32 route_cookie;
 882         u32 path_cookie;
 883 };
 884
 885 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
 886 {
 887         dst_release(xdst->route);
 888         if (likely(xdst->u.dst.xfrm))
 889                 xfrm_state_put(xdst->u.dst.xfrm);
 890 #ifdef CONFIG_XFRM_SUB_POLICY
 891         kfree(xdst->origin);
 892         xdst->origin = NULL;
 893         kfree(xdst->partner);
 894         xdst->partner = NULL;
 895 #endif
 896 }
 897
 898 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
 899
 900 struct sec_path
 901 {
 902         atomic_t                refcnt;
 903         int                     len;
 904         struct xfrm_state       *xvec[XFRM_MAX_DEPTH];
 905 };
 906
 907 static inline struct sec_path *
 908 secpath_get(struct sec_path *sp)
 909 {
 910         if (sp)
 911                 atomic_inc(&sp->refcnt);
 912         return sp;
 913 }
 914
 915 extern void __secpath_destroy(struct sec_path *sp);
 916
 917 static inline void
 918 secpath_put(struct sec_path *sp)
 919 {
 920         if (sp && atomic_dec_and_test(&sp->refcnt))
 921                 __secpath_destroy(sp);
 922 }
 923
 924 extern struct sec_path *secpath_dup(struct sec_path *src);
 925
 926 static inline void
 927 secpath_reset(struct sk_buff *skb)
 928 {
 929 #ifdef CONFIG_XFRM
 930         secpath_put(skb->sp);
 931         skb->sp = NULL;
 932 #endif
 933 }
 934
 935 static inline int
 936 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
 937 {
 938         switch (family) {
 939         case AF_INET:
 940                 return addr->a4 == 0;
 941         case AF_INET6:
 942                 return ipv6_addr_any((struct in6_addr *)&addr->a6);
 943         }
 944         return 0;
 945 }
 946
 947 static inline int
 948 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 949 {
 950         return  (tmpl->saddr.a4 &&
 951                  tmpl->saddr.a4 != x->props.saddr.a4);
 952 }
 953
 954 static inline int
 955 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 956 {
 957         return  (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
 958                  ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
 959 }
 960
 961 static inline int
 962 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
 963 {
 964         switch (family) {
 965         case AF_INET:
 966                 return __xfrm4_state_addr_cmp(tmpl, x);
 967         case AF_INET6:
 968                 return __xfrm6_state_addr_cmp(tmpl, x);
 969         }
 970         return !0;
 971 }
 972
 973 #ifdef CONFIG_XFRM
 974 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
 975
 976 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
 977                                        struct sk_buff *skb,
 978                                        unsigned int family, int reverse)
 979 {
 980         int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
 981
 982         if (sk && sk->sk_policy[XFRM_POLICY_IN])
 983                 return __xfrm_policy_check(sk, ndir, skb, family);
 984
 985         return  (!xfrm_policy_count[dir] && !skb->sp) ||
 986                 (skb->dst->flags & DST_NOPOLICY) ||
 987                 __xfrm_policy_check(sk, ndir, skb, family);
 988 }
 989
 990 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
 991 {
 992         return __xfrm_policy_check2(sk, dir, skb, family, 0);
 993 }
 994
 995 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 996 {
 997         return xfrm_policy_check(sk, dir, skb, AF_INET);
 998 }
 999
1000 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1001 {
1002         return xfrm_policy_check(sk, dir, skb, AF_INET6);
1003 }
1004
1005 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1006                                              struct sk_buff *skb)
1007 {
1008         return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1009 }
1010
1011 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1012                                              struct sk_buff *skb)
1013 {
1014         return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1015 }
1016
1017 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1018                                  unsigned int family, int reverse);
1019
1020 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1021                                       unsigned int family)
1022 {
1023         return __xfrm_decode_session(skb, fl, family, 0);
1024 }
1025
1026 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1027                                               struct flowi *fl,
1028                                               unsigned int family)
1029 {
1030         return __xfrm_decode_session(skb, fl, family, 1);
1031 }
1032
1033 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1034
1035 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1036 {
1037         return  !xfrm_policy_count[XFRM_POLICY_OUT] ||
1038                 (skb->dst->flags & DST_NOXFRM) ||
1039                 __xfrm_route_forward(skb, family);
1040 }
1041
1042 static inline int xfrm4_route_forward(struct sk_buff *skb)
1043 {
1044         return xfrm_route_forward(skb, AF_INET);
1045 }
1046
1047 static inline int xfrm6_route_forward(struct sk_buff *skb)
1048 {
1049         return xfrm_route_forward(skb, AF_INET6);
1050 }
1051
1052 extern int __xfrm_sk_clone_policy(struct sock *sk);
1053
1054 static inline int xfrm_sk_clone_policy(struct sock *sk)
1055 {
1056         if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1057                 return __xfrm_sk_clone_policy(sk);
1058         return 0;
1059 }
1060
1061 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1062
1063 static inline void xfrm_sk_free_policy(struct sock *sk)
1064 {
1065         if (unlikely(sk->sk_policy[0] != NULL)) {
1066                 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1067                 sk->sk_policy[0] = NULL;
1068         }
1069         if (unlikely(sk->sk_policy[1] != NULL)) {
1070                 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1071                 sk->sk_policy[1] = NULL;
1072         }
1073 }
1074
1075 #else
1076
1077 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1078 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1079 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1080 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1081 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1082 {
1083         return 1;
1084 }
1085 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1086 {
1087         return 1;
1088 }
1089 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1090 {
1091         return 1;
1092 }
1093 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1094                                               struct flowi *fl,
1095                                               unsigned int family)
1096 {
1097         return -ENOSYS;
1098 }
1099 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1100                                              struct sk_buff *skb)
1101 {
1102         return 1;
1103 }
1104 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1105                                              struct sk_buff *skb)
1106 {
1107         return 1;
1108 }
1109 #endif
1110
1111 static __inline__
1112 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1113 {
1114         switch (family){
1115         case AF_INET:
1116                 return (xfrm_address_t *)&fl->fl4_dst;
1117         case AF_INET6:
1118                 return (xfrm_address_t *)&fl->fl6_dst;
1119         }
1120         return NULL;
1121 }
1122
1123 static __inline__
1124 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1125 {
1126         switch (family){
1127         case AF_INET:
1128                 return (xfrm_address_t *)&fl->fl4_src;
1129         case AF_INET6:
1130                 return (xfrm_address_t *)&fl->fl6_src;
1131         }
1132         return NULL;
1133 }
1134
1135 static __inline__
1136 void xfrm_flowi_addr_get(struct flowi *fl,
1137                          xfrm_address_t *saddr, xfrm_address_t *daddr,
1138                          unsigned short family)
1139 {
1140         switch(family) {
1141         case AF_INET:
1142                 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1143                 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1144                 break;
1145         case AF_INET6:
1146                 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1147                 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1148                 break;
1149         }
1150 }
1151
1152 static __inline__ int
1153 __xfrm4_state_addr_check(struct xfrm_state *x,
1154                          xfrm_address_t *daddr, xfrm_address_t *saddr)
1155 {
1156         if (daddr->a4 == x->id.daddr.a4 &&
1157             (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1158                 return 1;
1159         return 0;
1160 }
1161
1162 static __inline__ int
1163 __xfrm6_state_addr_check(struct xfrm_state *x,
1164                          xfrm_address_t *daddr, xfrm_address_t *saddr)
1165 {
1166         if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1167             (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1168              ipv6_addr_any((struct in6_addr *)saddr) ||
1169              ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1170                 return 1;
1171         return 0;
1172 }
1173
1174 static __inline__ int
1175 xfrm_state_addr_check(struct xfrm_state *x,
1176                       xfrm_address_t *daddr, xfrm_address_t *saddr,
1177                       unsigned short family)
1178 {
1179         switch (family) {
1180         case AF_INET:
1181                 return __xfrm4_state_addr_check(x, daddr, saddr);
1182         case AF_INET6:
1183                 return __xfrm6_state_addr_check(x, daddr, saddr);
1184         }
1185         return 0;
1186 }
1187
1188 static __inline__ int
1189 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1190                            unsigned short family)
1191 {
1192         switch (family) {
1193         case AF_INET:
1194                 return __xfrm4_state_addr_check(x,
1195                                                 (xfrm_address_t *)&fl->fl4_dst,
1196                                                 (xfrm_address_t *)&fl->fl4_src);
1197         case AF_INET6:
1198                 return __xfrm6_state_addr_check(x,
1199                                                 (xfrm_address_t *)&fl->fl6_dst,
1200                                                 (xfrm_address_t *)&fl->fl6_src);
1201         }
1202         return 0;
1203 }
1204
1205 static inline int xfrm_state_kern(struct xfrm_state *x)
1206 {
1207         return atomic_read(&x->tunnel_users);
1208 }
1209
1210 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1211 {
1212         return (!userproto || proto == userproto ||
1213                 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1214                                                   proto == IPPROTO_ESP ||
1215                                                   proto == IPPROTO_COMP)));
1216 }
1217
1218 /*
1219  * xfrm algorithm information
1220  */
1221 struct xfrm_algo_aead_info {
1222         u16 icv_truncbits;
1223 };
1224
1225 struct xfrm_algo_auth_info {
1226         u16 icv_truncbits;
1227         u16 icv_fullbits;
1228 };
1229
1230 struct xfrm_algo_encr_info {
1231         u16 blockbits;
1232         u16 defkeybits;
1233 };
1234
1235 struct xfrm_algo_comp_info {
1236         u16 threshold;
1237 };
1238
1239 struct xfrm_algo_desc {
1240         char *name;
1241         char *compat;
1242         u8 available:1;
1243         union {
1244                 struct xfrm_algo_aead_info aead;
1245                 struct xfrm_algo_auth_info auth;
1246                 struct xfrm_algo_encr_info encr;
1247                 struct xfrm_algo_comp_info comp;
1248         } uinfo;
1249         struct sadb_alg desc;
1250 };
1251
1252 /* XFRM tunnel handlers.  */
1253 struct xfrm_tunnel {
1254         int (*handler)(struct sk_buff *skb);
1255         int (*err_handler)(struct sk_buff *skb, __u32 info);
1256
1257         struct xfrm_tunnel *next;
1258         int priority;
1259 };
1260
1261 struct xfrm6_tunnel {
1262         int (*handler)(struct sk_buff *skb);
1263         int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1264                            int type, int code, int offset, __be32 info);
1265         struct xfrm6_tunnel *next;
1266         int priority;
1267 };
1268
1269 extern void xfrm_init(void);
1270 extern void xfrm4_init(void);
1271 extern void xfrm_state_init(void);
1272 extern void xfrm4_state_init(void);
1273 #ifdef CONFIG_XFRM
1274 extern int xfrm6_init(void);
1275 extern void xfrm6_fini(void);
1276 extern int xfrm6_state_init(void);
1277 extern void xfrm6_state_fini(void);
1278 #else
1279 static inline int xfrm6_init(void)
1280 {
1281         return 0;
1282 }
1283 static inline void xfrm6_fini(void)
1284 {
1285         ;
1286 }
1287 #endif
1288
1289 #ifdef CONFIG_XFRM_STATISTICS
1290 extern int xfrm_proc_init(void);
1291 #endif
1292
1293 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1294 extern int xfrm_state_walk(struct xfrm_state_walk *walk,
1295                            int (*func)(struct xfrm_state *, int, void*), void *);
1296 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1297 extern struct xfrm_state *xfrm_state_alloc(void);
1298 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1299                                           struct flowi *fl, struct xfrm_tmpl *tmpl,
1300                                           struct xfrm_policy *pol, int *err,
1301                                           unsigned short family);
1302 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1303                                                xfrm_address_t *saddr,
1304                                                unsigned short family,
1305                                                u8 mode, u8 proto, u32 reqid);
1306 extern int xfrm_state_check_expire(struct xfrm_state *x);
1307 extern void xfrm_state_insert(struct xfrm_state *x);
1308 extern int xfrm_state_add(struct xfrm_state *x);
1309 extern int xfrm_state_update(struct xfrm_state *x);
1310 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1311 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1312 #ifdef CONFIG_XFRM_SUB_POLICY
1313 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1314                           int n, unsigned short family);
1315 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1316                            int n, unsigned short family);
1317 #else
1318 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1319                                  int n, unsigned short family)
1320 {
1321         return -ENOSYS;
1322 }
1323
1324 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1325                                   int n, unsigned short family)
1326 {
1327         return -ENOSYS;
1328 }
1329 #endif
1330
1331 struct xfrmk_sadinfo {
1332         u32 sadhcnt; /* current hash bkts */
1333         u32 sadhmcnt; /* max allowed hash bkts */
1334         u32 sadcnt; /* current running count */
1335 };
1336
1337 struct xfrmk_spdinfo {
1338         u32 incnt;
1339         u32 outcnt;
1340         u32 fwdcnt;
1341         u32 inscnt;
1342         u32 outscnt;
1343         u32 fwdscnt;
1344         u32 spdhcnt;
1345         u32 spdhmcnt;
1346 };
1347
1348 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1349 extern int xfrm_state_delete(struct xfrm_state *x);
1350 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1351 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1352 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1353 extern int xfrm_replay_check(struct xfrm_state *x,
1354                              struct sk_buff *skb, __be32 seq);
1355 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1356 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1357 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1358 extern int xfrm_init_state(struct xfrm_state *x);
1359 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1360 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1361                       int encap_type);
1362 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1363 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1364 extern int xfrm_output(struct sk_buff *skb);
1365 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1366 extern int xfrm4_extract_header(struct sk_buff *skb);
1367 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1368 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1369                            int encap_type);
1370 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1371 extern int xfrm4_rcv(struct sk_buff *skb);
1372
1373 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1374 {
1375         return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1376 }
1377
1378 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1379 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1380 extern int xfrm4_output(struct sk_buff *skb);
1381 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1382 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1383 extern int xfrm6_extract_header(struct sk_buff *skb);
1384 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1385 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1386 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1387 extern int xfrm6_rcv(struct sk_buff *skb);
1388 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1389                             xfrm_address_t *saddr, u8 proto);
1390 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1391 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1392 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1393 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1394 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1395 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1396 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1397 extern int xfrm6_output(struct sk_buff *skb);
1398 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1399                                  u8 **prevhdr);
1400
1401 #ifdef CONFIG_XFRM
1402 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1403 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1404 #else
1405 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1406 {
1407         return -ENOPROTOOPT;
1408 }
1409
1410 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1411 {
1412         /* should not happen */
1413         kfree_skb(skb);
1414         return 0;
1415 }
1416 #endif
1417
1418 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1419
1420 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1421 extern int xfrm_policy_walk(struct xfrm_policy_walk *walk,
1422         int (*func)(struct xfrm_policy *, int, int, void*), void *);
1423 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1424 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1425 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1426                                           struct xfrm_selector *sel,
1427                                           struct xfrm_sec_ctx *ctx, int delete,
1428                                           int *err);
1429 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1430 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1431 u32 xfrm_get_acqseq(void);
1432 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1433 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1434                                   xfrm_address_t *daddr, xfrm_address_t *saddr,
1435                                   int create, unsigned short family);
1436 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1437 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1438                           struct flowi *fl, int family, int strict);
1439
1440 #ifdef CONFIG_XFRM_MIGRATE
1441 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1442                       struct xfrm_migrate *m, int num_bundles,
1443                       struct xfrm_kmaddress *k);
1444 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1445 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1446                                               struct xfrm_migrate *m);
1447 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1448                         struct xfrm_migrate *m, int num_bundles,
1449                         struct xfrm_kmaddress *k);
1450 #endif
1451
1452 extern wait_queue_head_t km_waitq;
1453 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1454 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1455 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1456
1457 extern void xfrm_input_init(void);
1458 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1459
1460 extern void xfrm_probe_algs(void);
1461 extern int xfrm_count_auth_supported(void);
1462 extern int xfrm_count_enc_supported(void);
1463 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1464 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1465 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1466 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1467 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1468 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1469 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1470 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1471 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1472                                                    int probe);
1473
1474 struct hash_desc;
1475 struct scatterlist;
1476 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1477                               unsigned int);
1478
1479 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1480                         int offset, int len, icv_update_fn_t icv_update);
1481
1482 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1483                                 int family)
1484 {
1485         switch (family) {
1486         default:
1487         case AF_INET:
1488                 return (__force __u32)a->a4 - (__force __u32)b->a4;
1489         case AF_INET6:
1490                 return ipv6_addr_cmp((struct in6_addr *)a,
1491                                      (struct in6_addr *)b);
1492         }
1493 }
1494
1495 static inline int xfrm_policy_id2dir(u32 index)
1496 {
1497         return index & 7;
1498 }
1499
1500 static inline int xfrm_aevent_is_on(void)
1501 {
1502         struct sock *nlsk;
1503         int ret = 0;
1504
1505         rcu_read_lock();
1506         nlsk = rcu_dereference(xfrm_nl);
1507         if (nlsk)
1508                 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1509         rcu_read_unlock();
1510         return ret;
1511 }
1512
1513 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1514 {
1515         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1516 }
1517
1518 #ifdef CONFIG_XFRM_MIGRATE
1519 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1520 {
1521         return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1522 }
1523
1524 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1525 {
1526         int i;
1527         for (i = 0; i < n; i++)
1528                 xfrm_state_put(*(states + i));
1529 }
1530
1531 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1532 {
1533         int i;
1534         for (i = 0; i < n; i++)
1535                 xfrm_state_delete(*(states + i));
1536 }
1537 #endif
1538
1539 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1540 {
1541         return skb->sp->xvec[skb->sp->len - 1];
1542 }
1543
1544 #endif  /* _NET_XFRM_H */