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 #include <linux/slab.h>
  16
  17 #include <net/sock.h>
  18 #include <net/dst.h>
  19 #include <net/ip.h>
  20 #include <net/route.h>
  21 #include <net/ipv6.h>
  22 #include <net/ip6_fib.h>
  23 #include <net/flow.h>
  24
  25 #include <linux/interrupt.h>
  26
  27 #ifdef CONFIG_XFRM_STATISTICS
  28 #include <net/snmp.h>
  29 #endif
  30
  31 #define XFRM_PROTO_ESP          50
  32 #define XFRM_PROTO_AH           51
  33 #define XFRM_PROTO_COMP         108
  34 #define XFRM_PROTO_IPIP         4
  35 #define XFRM_PROTO_IPV6         41
  36 #define XFRM_PROTO_ROUTING      IPPROTO_ROUTING
  37 #define XFRM_PROTO_DSTOPTS      IPPROTO_DSTOPTS
  38
  39 #define XFRM_ALIGN8(len)        (((len) + 7) & ~7)
  40 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
  41         MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
  42 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
  43         MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
  44
  45 #ifdef CONFIG_XFRM_STATISTICS
  46 #define XFRM_INC_STATS(net, field)      SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
  47 #define XFRM_INC_STATS_BH(net, field)   SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
  48 #define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
  49 #else
  50 #define XFRM_INC_STATS(net, field)      ((void)(net))
  51 #define XFRM_INC_STATS_BH(net, field)   ((void)(net))
  52 #define XFRM_INC_STATS_USER(net, field) ((void)(net))
  53 #endif
  54
  55 extern struct mutex xfrm_cfg_mutex;
  56
  57 /* Organization of SPD aka "XFRM rules"
  58    ------------------------------------
  59
  60    Basic objects:
  61    - policy rule, struct xfrm_policy (=SPD entry)
  62    - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
  63    - instance of a transformer, struct xfrm_state (=SA)
  64    - template to clone xfrm_state, struct xfrm_tmpl
  65
  66    SPD is plain linear list of xfrm_policy rules, ordered by priority.
  67    (To be compatible with existing pfkeyv2 implementations,
  68    many rules with priority of 0x7fffffff are allowed to exist and
  69    such rules are ordered in an unpredictable way, thanks to bsd folks.)
  70
  71    Lookup is plain linear search until the first match with selector.
  72
  73    If "action" is "block", then we prohibit the flow, otherwise:
  74    if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
  75    policy entry has list of up to XFRM_MAX_DEPTH transformations,
  76    described by templates xfrm_tmpl. Each template is resolved
  77    to a complete xfrm_state (see below) and we pack bundle of transformations
  78    to a dst_entry returned to requestor.
  79
  80    dst -. xfrm  .-> xfrm_state #1
  81     |---. child .-> dst -. xfrm .-> xfrm_state #2
  82                      |---. child .-> dst -. xfrm .-> xfrm_state #3
  83                                       |---. child .-> NULL
  84
  85    Bundles are cached at xrfm_policy struct (field ->bundles).
  86
  87
  88    Resolution of xrfm_tmpl
  89    -----------------------
  90    Template contains:
  91    1. ->mode            Mode: transport or tunnel
  92    2. ->id.proto        Protocol: AH/ESP/IPCOMP
  93    3. ->id.daddr        Remote tunnel endpoint, ignored for transport mode.
  94       Q: allow to resolve security gateway?
  95    4. ->id.spi          If not zero, static SPI.
  96    5. ->saddr           Local tunnel endpoint, ignored for transport mode.
  97    6. ->algos           List of allowed algos. Plain bitmask now.
  98       Q: ealgos, aalgos, calgos. What a mess...
  99    7. ->share           Sharing mode.
 100       Q: how to implement private sharing mode? To add struct sock* to
 101       flow id?
 102
 103    Having this template we search through SAD searching for entries
 104    with appropriate mode/proto/algo, permitted by selector.
 105    If no appropriate entry found, it is requested from key manager.
 106
 107    PROBLEMS:
 108    Q: How to find all the bundles referring to a physical path for
 109       PMTU discovery? Seems, dst should contain list of all parents...
 110       and enter to infinite locking hierarchy disaster.
 111       No! It is easier, we will not search for them, let them find us.
 112       We add genid to each dst plus pointer to genid of raw IP route,
 113       pmtu disc will update pmtu on raw IP route and increase its genid.
 114       dst_check() will see this for top level and trigger resyncing
 115       metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
 116  */
 117
 118 struct xfrm_state_walk {
 119         struct list_head        all;
 120         u8                      state;
 121         union {
 122                 u8              dying;
 123                 u8              proto;
 124         };
 125         u32                     seq;
 126 };
 127
 128 /* Full description of state of transformer. */
 129 struct xfrm_state {
 130 #ifdef CONFIG_NET_NS
 131         struct net              *xs_net;
 132 #endif
 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         struct xfrm_mark        mark;
 146         u32                     tfcpad;
 147
 148         u32                     genid;
 149
 150         /* Key manager bits */
 151         struct xfrm_state_walk  km;
 152
 153         /* Parameters of this state. */
 154         struct {
 155                 u32             reqid;
 156                 u8              mode;
 157                 u8              replay_window;
 158                 u8              aalgo, ealgo, calgo;
 159                 u8              flags;
 160                 u16             family;
 161                 xfrm_address_t  saddr;
 162                 int             header_len;
 163                 int             trailer_len;
 164         } props;
 165
 166         struct xfrm_lifetime_cfg lft;
 167
 168         /* Data for transformer */
 169         struct xfrm_algo_auth   *aalg;
 170         struct xfrm_algo        *ealg;
 171         struct xfrm_algo        *calg;
 172         struct xfrm_algo_aead   *aead;
 173
 174         /* Data for encapsulator */
 175         struct xfrm_encap_tmpl  *encap;
 176
 177         /* Data for care-of address */
 178         xfrm_address_t  *coaddr;
 179
 180         /* IPComp needs an IPIP tunnel for handling uncompressed packets */
 181         struct xfrm_state       *tunnel;
 182
 183         /* If a tunnel, number of users + 1 */
 184         atomic_t                tunnel_users;
 185
 186         /* State for replay detection */
 187         struct xfrm_replay_state replay;
 188
 189         /* Replay detection state at the time we sent the last notification */
 190         struct xfrm_replay_state preplay;
 191
 192         /* internal flag that only holds state for delayed aevent at the
 193          * moment
 194         */
 195         u32                     xflags;
 196
 197         /* Replay detection notification settings */
 198         u32                     replay_maxage;
 199         u32                     replay_maxdiff;
 200
 201         /* Replay detection notification timer */
 202         struct timer_list       rtimer;
 203
 204         /* Statistics */
 205         struct xfrm_stats       stats;
 206
 207         struct xfrm_lifetime_cur curlft;
 208         struct tasklet_hrtimer  mtimer;
 209
 210         /* Last used time */
 211         unsigned long           lastused;
 212
 213         /* Reference to data common to all the instances of this
 214          * transformer. */
 215         const struct xfrm_type  *type;
 216         struct xfrm_mode        *inner_mode;
 217         struct xfrm_mode        *inner_mode_iaf;
 218         struct xfrm_mode        *outer_mode;
 219
 220         /* Security context */
 221         struct xfrm_sec_ctx     *security;
 222
 223         /* Private data of this transformer, format is opaque,
 224          * interpreted by xfrm_type methods. */
 225         void                    *data;
 226 };
 227
 228 static inline struct net *xs_net(struct xfrm_state *x)
 229 {
 230         return read_pnet(&x->xs_net);
 231 }
 232
 233 /* xflags - make enum if more show up */
 234 #define XFRM_TIME_DEFER 1
 235
 236 enum {
 237         XFRM_STATE_VOID,
 238         XFRM_STATE_ACQ,
 239         XFRM_STATE_VALID,
 240         XFRM_STATE_ERROR,
 241         XFRM_STATE_EXPIRED,
 242         XFRM_STATE_DEAD
 243 };
 244
 245 /* callback structure passed from either netlink or pfkey */
 246 struct km_event {
 247         union {
 248                 u32 hard;
 249                 u32 proto;
 250                 u32 byid;
 251                 u32 aevent;
 252                 u32 type;
 253         } data;
 254
 255         u32     seq;
 256         u32     pid;
 257         u32     event;
 258         struct net *net;
 259 };
 260
 261 struct net_device;
 262 struct xfrm_type;
 263 struct xfrm_dst;
 264 struct xfrm_policy_afinfo {
 265         unsigned short          family;
 266         struct dst_ops          *dst_ops;
 267         void                    (*garbage_collect)(struct net *net);
 268         struct dst_entry        *(*dst_lookup)(struct net *net, int tos,
 269                                                xfrm_address_t *saddr,
 270                                                xfrm_address_t *daddr);
 271         int                     (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
 272         void                    (*decode_session)(struct sk_buff *skb,
 273                                                   struct flowi *fl,
 274                                                   int reverse);
 275         int                     (*get_tos)(struct flowi *fl);
 276         int                     (*init_path)(struct xfrm_dst *path,
 277                                              struct dst_entry *dst,
 278                                              int nfheader_len);
 279         int                     (*fill_dst)(struct xfrm_dst *xdst,
 280                                             struct net_device *dev,
 281                                             struct flowi *fl);
 282 };
 283
 284 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
 285 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
 286 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
 287 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
 288
 289 struct xfrm_tmpl;
 290 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
 291 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
 292 extern int __xfrm_state_delete(struct xfrm_state *x);
 293
 294 struct xfrm_state_afinfo {
 295         unsigned int            family;
 296         unsigned int            proto;
 297         __be16                  eth_proto;
 298         struct module           *owner;
 299         const struct xfrm_type  *type_map[IPPROTO_MAX];
 300         struct xfrm_mode        *mode_map[XFRM_MODE_MAX];
 301         int                     (*init_flags)(struct xfrm_state *x);
 302         void                    (*init_tempsel)(struct xfrm_selector *sel, struct flowi *fl);
 303         void                    (*init_temprop)(struct xfrm_state *x, struct xfrm_tmpl *tmpl,
 304                                                 xfrm_address_t *daddr, xfrm_address_t *saddr);
 305         int                     (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
 306         int                     (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
 307         int                     (*output)(struct sk_buff *skb);
 308         int                     (*extract_input)(struct xfrm_state *x,
 309                                                  struct sk_buff *skb);
 310         int                     (*extract_output)(struct xfrm_state *x,
 311                                                   struct sk_buff *skb);
 312         int                     (*transport_finish)(struct sk_buff *skb,
 313                                                     int async);
 314 };
 315
 316 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
 317 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
 318
 319 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
 320
 321 struct xfrm_type {
 322         char                    *description;
 323         struct module           *owner;
 324         u8                      proto;
 325         u8                      flags;
 326 #define XFRM_TYPE_NON_FRAGMENT  1
 327 #define XFRM_TYPE_REPLAY_PROT   2
 328 #define XFRM_TYPE_LOCAL_COADDR  4
 329 #define XFRM_TYPE_REMOTE_COADDR 8
 330
 331         int                     (*init_state)(struct xfrm_state *x);
 332         void                    (*destructor)(struct xfrm_state *);
 333         int                     (*input)(struct xfrm_state *, struct sk_buff *skb);
 334         int                     (*output)(struct xfrm_state *, struct sk_buff *pskb);
 335         int                     (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
 336         int                     (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
 337         /* Estimate maximal size of result of transformation of a dgram */
 338         u32                     (*get_mtu)(struct xfrm_state *, int size);
 339 };
 340
 341 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
 342 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
 343
 344 struct xfrm_mode {
 345         /*
 346          * Remove encapsulation header.
 347          *
 348          * The IP header will be moved over the top of the encapsulation
 349          * header.
 350          *
 351          * On entry, the transport header shall point to where the IP header
 352          * should be and the network header shall be set to where the IP
 353          * header currently is.  skb->data shall point to the start of the
 354          * payload.
 355          */
 356         int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
 357
 358         /*
 359          * This is the actual input entry point.
 360          *
 361          * For transport mode and equivalent this would be identical to
 362          * input2 (which does not need to be set).  While tunnel mode
 363          * and equivalent would set this to the tunnel encapsulation function
 364          * xfrm4_prepare_input that would in turn call input2.
 365          */
 366         int (*input)(struct xfrm_state *x, struct sk_buff *skb);
 367
 368         /*
 369          * Add encapsulation header.
 370          *
 371          * On exit, the transport header will be set to the start of the
 372          * encapsulation header to be filled in by x->type->output and
 373          * the mac header will be set to the nextheader (protocol for
 374          * IPv4) field of the extension header directly preceding the
 375          * encapsulation header, or in its absence, that of the top IP
 376          * header.  The value of the network header will always point
 377          * to the top IP header while skb->data will point to the payload.
 378          */
 379         int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
 380
 381         /*
 382          * This is the actual output entry point.
 383          *
 384          * For transport mode and equivalent this would be identical to
 385          * output2 (which does not need to be set).  While tunnel mode
 386          * and equivalent would set this to a tunnel encapsulation function
 387          * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
 388          * call output2.
 389          */
 390         int (*output)(struct xfrm_state *x, struct sk_buff *skb);
 391
 392         struct xfrm_state_afinfo *afinfo;
 393         struct module *owner;
 394         unsigned int encap;
 395         int flags;
 396 };
 397
 398 /* Flags for xfrm_mode. */
 399 enum {
 400         XFRM_MODE_FLAG_TUNNEL = 1,
 401 };
 402
 403 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
 404 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
 405
 406 static inline int xfrm_af2proto(unsigned int family)
 407 {
 408         switch(family) {
 409         case AF_INET:
 410                 return IPPROTO_IPIP;
 411         case AF_INET6:
 412                 return IPPROTO_IPV6;
 413         default:
 414                 return 0;
 415         }
 416 }
 417
 418 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
 419 {
 420         if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
 421             (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
 422                 return x->inner_mode;
 423         else
 424                 return x->inner_mode_iaf;
 425 }
 426
 427 struct xfrm_tmpl {
 428 /* id in template is interpreted as:
 429  * daddr - destination of tunnel, may be zero for transport mode.
 430  * spi   - zero to acquire spi. Not zero if spi is static, then
 431  *         daddr must be fixed too.
 432  * proto - AH/ESP/IPCOMP
 433  */
 434         struct xfrm_id          id;
 435
 436 /* Source address of tunnel. Ignored, if it is not a tunnel. */
 437         xfrm_address_t          saddr;
 438
 439         unsigned short          encap_family;
 440
 441         u32                     reqid;
 442
 443 /* Mode: transport, tunnel etc. */
 444         u8                      mode;
 445
 446 /* Sharing mode: unique, this session only, this user only etc. */
 447         u8                      share;
 448
 449 /* May skip this transfomration if no SA is found */
 450         u8                      optional;
 451
 452 /* Skip aalgos/ealgos/calgos checks. */
 453         u8                      allalgs;
 454
 455 /* Bit mask of algos allowed for acquisition */
 456         u32                     aalgos;
 457         u32                     ealgos;
 458         u32                     calgos;
 459 };
 460
 461 #define XFRM_MAX_DEPTH          6
 462
 463 struct xfrm_policy_walk_entry {
 464         struct list_head        all;
 465         u8                      dead;
 466 };
 467
 468 struct xfrm_policy_walk {
 469         struct xfrm_policy_walk_entry walk;
 470         u8 type;
 471         u32 seq;
 472 };
 473
 474 struct xfrm_policy {
 475 #ifdef CONFIG_NET_NS
 476         struct net              *xp_net;
 477 #endif
 478         struct hlist_node       bydst;
 479         struct hlist_node       byidx;
 480
 481         /* This lock only affects elements except for entry. */
 482         rwlock_t                lock;
 483         atomic_t                refcnt;
 484         struct timer_list       timer;
 485
 486         struct flow_cache_object flo;
 487         atomic_t                genid;
 488         u32                     priority;
 489         u32                     index;
 490         struct xfrm_mark        mark;
 491         struct xfrm_selector    selector;
 492         struct xfrm_lifetime_cfg lft;
 493         struct xfrm_lifetime_cur curlft;
 494         struct xfrm_policy_walk_entry walk;
 495         u8                      type;
 496         u8                      action;
 497         u8                      flags;
 498         u8                      xfrm_nr;
 499         u16                     family;
 500         struct xfrm_sec_ctx     *security;
 501         struct xfrm_tmpl        xfrm_vec[XFRM_MAX_DEPTH];
 502 };
 503
 504 static inline struct net *xp_net(struct xfrm_policy *xp)
 505 {
 506         return read_pnet(&xp->xp_net);
 507 }
 508
 509 struct xfrm_kmaddress {
 510         xfrm_address_t          local;
 511         xfrm_address_t          remote;
 512         u32                     reserved;
 513         u16                     family;
 514 };
 515
 516 struct xfrm_migrate {
 517         xfrm_address_t          old_daddr;
 518         xfrm_address_t          old_saddr;
 519         xfrm_address_t          new_daddr;
 520         xfrm_address_t          new_saddr;
 521         u8                      proto;
 522         u8                      mode;
 523         u16                     reserved;
 524         u32                     reqid;
 525         u16                     old_family;
 526         u16                     new_family;
 527 };
 528
 529 #define XFRM_KM_TIMEOUT                30
 530 /* which seqno */
 531 #define XFRM_REPLAY_SEQ         1
 532 #define XFRM_REPLAY_OSEQ        2
 533 #define XFRM_REPLAY_SEQ_MASK    3
 534 /* what happened */
 535 #define XFRM_REPLAY_UPDATE      XFRM_AE_CR
 536 #define XFRM_REPLAY_TIMEOUT     XFRM_AE_CE
 537
 538 /* default aevent timeout in units of 100ms */
 539 #define XFRM_AE_ETIME                   10
 540 /* Async Event timer multiplier */
 541 #define XFRM_AE_ETH_M                   10
 542 /* default seq threshold size */
 543 #define XFRM_AE_SEQT_SIZE               2
 544
 545 struct xfrm_mgr {
 546         struct list_head        list;
 547         char                    *id;
 548         int                     (*notify)(struct xfrm_state *x, struct km_event *c);
 549         int                     (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
 550         struct xfrm_policy      *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
 551         int                     (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
 552         int                     (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
 553         int                     (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
 554         int                     (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
 555 };
 556
 557 extern int xfrm_register_km(struct xfrm_mgr *km);
 558 extern int xfrm_unregister_km(struct xfrm_mgr *km);
 559
 560 /*
 561  * This structure is used for the duration where packets are being
 562  * transformed by IPsec.  As soon as the packet leaves IPsec the
 563  * area beyond the generic IP part may be overwritten.
 564  */
 565 struct xfrm_skb_cb {
 566         union {
 567                 struct inet_skb_parm h4;
 568                 struct inet6_skb_parm h6;
 569         } header;
 570
 571         /* Sequence number for replay protection. */
 572         union {
 573                 u64 output;
 574                 __be32 input;
 575         } seq;
 576 };
 577
 578 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
 579
 580 /*
 581  * This structure is used by the afinfo prepare_input/prepare_output functions
 582  * to transmit header information to the mode input/output functions.
 583  */
 584 struct xfrm_mode_skb_cb {
 585         union {
 586                 struct inet_skb_parm h4;
 587                 struct inet6_skb_parm h6;
 588         } header;
 589
 590         /* Copied from header for IPv4, always set to zero and DF for IPv6. */
 591         __be16 id;
 592         __be16 frag_off;
 593
 594         /* IP header length (excluding options or extension headers). */
 595         u8 ihl;
 596
 597         /* TOS for IPv4, class for IPv6. */
 598         u8 tos;
 599
 600         /* TTL for IPv4, hop limitfor IPv6. */
 601         u8 ttl;
 602
 603         /* Protocol for IPv4, NH for IPv6. */
 604         u8 protocol;
 605
 606         /* Option length for IPv4, zero for IPv6. */
 607         u8 optlen;
 608
 609         /* Used by IPv6 only, zero for IPv4. */
 610         u8 flow_lbl[3];
 611 };
 612
 613 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
 614
 615 /*
 616  * This structure is used by the input processing to locate the SPI and
 617  * related information.
 618  */
 619 struct xfrm_spi_skb_cb {
 620         union {
 621                 struct inet_skb_parm h4;
 622                 struct inet6_skb_parm h6;
 623         } header;
 624
 625         unsigned int daddroff;
 626         unsigned int family;
 627 };
 628
 629 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
 630
 631 /* Audit Information */
 632 struct xfrm_audit {
 633         u32     secid;
 634         uid_t   loginuid;
 635         u32     sessionid;
 636 };
 637
 638 #ifdef CONFIG_AUDITSYSCALL
 639 static inline struct audit_buffer *xfrm_audit_start(const char *op)
 640 {
 641         struct audit_buffer *audit_buf = NULL;
 642
 643         if (audit_enabled == 0)
 644                 return NULL;
 645         audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
 646                                     AUDIT_MAC_IPSEC_EVENT);
 647         if (audit_buf == NULL)
 648                 return NULL;
 649         audit_log_format(audit_buf, "op=%s", op);
 650         return audit_buf;
 651 }
 652
 653 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
 654                                              struct audit_buffer *audit_buf)
 655 {
 656         char *secctx;
 657         u32 secctx_len;
 658
 659         audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
 660         if (secid != 0 &&
 661             security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
 662                 audit_log_format(audit_buf, " subj=%s", secctx);
 663                 security_release_secctx(secctx, secctx_len);
 664         } else
 665                 audit_log_task_context(audit_buf);
 666 }
 667
 668 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 669                                   u32 auid, u32 ses, u32 secid);
 670 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 671                                   u32 auid, u32 ses, u32 secid);
 672 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
 673                                  u32 auid, u32 ses, u32 secid);
 674 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 675                                     u32 auid, u32 ses, u32 secid);
 676 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 677                                              struct sk_buff *skb);
 678 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
 679 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 680                                       __be32 net_spi, __be32 net_seq);
 681 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
 682                                      struct sk_buff *skb, u8 proto);
 683 #else
 684
 685 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 686                                   u32 auid, u32 ses, u32 secid)
 687 {
 688 }
 689
 690 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 691                                   u32 auid, u32 ses, u32 secid)
 692 {
 693 }
 694
 695 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
 696                                  u32 auid, u32 ses, u32 secid)
 697 {
 698 }
 699
 700 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 701                                     u32 auid, u32 ses, u32 secid)
 702 {
 703 }
 704
 705 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 706                                              struct sk_buff *skb)
 707 {
 708 }
 709
 710 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
 711                                       u16 family)
 712 {
 713 }
 714
 715 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 716                                       __be32 net_spi, __be32 net_seq)
 717 {
 718 }
 719
 720 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
 721                                      struct sk_buff *skb, u8 proto)
 722 {
 723 }
 724 #endif /* CONFIG_AUDITSYSCALL */
 725
 726 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
 727 {
 728         if (likely(policy != NULL))
 729                 atomic_inc(&policy->refcnt);
 730 }
 731
 732 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
 733
 734 static inline void xfrm_pol_put(struct xfrm_policy *policy)
 735 {
 736         if (atomic_dec_and_test(&policy->refcnt))
 737                 xfrm_policy_destroy(policy);
 738 }
 739
 740 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 741 {
 742         int i;
 743         for (i = npols - 1; i >= 0; --i)
 744                 xfrm_pol_put(pols[i]);
 745 }
 746
 747 extern void __xfrm_state_destroy(struct xfrm_state *);
 748
 749 static inline void __xfrm_state_put(struct xfrm_state *x)
 750 {
 751         atomic_dec(&x->refcnt);
 752 }
 753
 754 static inline void xfrm_state_put(struct xfrm_state *x)
 755 {
 756         if (atomic_dec_and_test(&x->refcnt))
 757                 __xfrm_state_destroy(x);
 758 }
 759
 760 static inline void xfrm_state_hold(struct xfrm_state *x)
 761 {
 762         atomic_inc(&x->refcnt);
 763 }
 764
 765 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
 766 {
 767         __be32 *a1 = token1;
 768         __be32 *a2 = token2;
 769         int pdw;
 770         int pbi;
 771
 772         pdw = prefixlen >> 5;     /* num of whole u32 in prefix */
 773         pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
 774
 775         if (pdw)
 776                 if (memcmp(a1, a2, pdw << 2))
 777                         return 0;
 778
 779         if (pbi) {
 780                 __be32 mask;
 781
 782                 mask = htonl((0xffffffff) << (32 - pbi));
 783
 784                 if ((a1[pdw] ^ a2[pdw]) & mask)
 785                         return 0;
 786         }
 787
 788         return 1;
 789 }
 790
 791 static __inline__
 792 __be16 xfrm_flowi_sport(struct flowi *fl)
 793 {
 794         __be16 port;
 795         switch(fl->proto) {
 796         case IPPROTO_TCP:
 797         case IPPROTO_UDP:
 798         case IPPROTO_UDPLITE:
 799         case IPPROTO_SCTP:
 800                 port = fl->fl_ip_sport;
 801                 break;
 802         case IPPROTO_ICMP:
 803         case IPPROTO_ICMPV6:
 804                 port = htons(fl->fl_icmp_type);
 805                 break;
 806         case IPPROTO_MH:
 807                 port = htons(fl->fl_mh_type);
 808                 break;
 809         case IPPROTO_GRE:
 810                 port = htons(ntohl(fl->fl_gre_key) >> 16);
 811                 break;
 812         default:
 813                 port = 0;       /*XXX*/
 814         }
 815         return port;
 816 }
 817
 818 static __inline__
 819 __be16 xfrm_flowi_dport(struct flowi *fl)
 820 {
 821         __be16 port;
 822         switch(fl->proto) {
 823         case IPPROTO_TCP:
 824         case IPPROTO_UDP:
 825         case IPPROTO_UDPLITE:
 826         case IPPROTO_SCTP:
 827                 port = fl->fl_ip_dport;
 828                 break;
 829         case IPPROTO_ICMP:
 830         case IPPROTO_ICMPV6:
 831                 port = htons(fl->fl_icmp_code);
 832                 break;
 833         case IPPROTO_GRE:
 834                 port = htons(ntohl(fl->fl_gre_key) & 0xffff);
 835                 break;
 836         default:
 837                 port = 0;       /*XXX*/
 838         }
 839         return port;
 840 }
 841
 842 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
 843                                unsigned short family);
 844
 845 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 846 /*      If neither has a context --> match
 847  *      Otherwise, both must have a context and the sids, doi, alg must match
 848  */
 849 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 850 {
 851         return ((!s1 && !s2) ||
 852                 (s1 && s2 &&
 853                  (s1->ctx_sid == s2->ctx_sid) &&
 854                  (s1->ctx_doi == s2->ctx_doi) &&
 855                  (s1->ctx_alg == s2->ctx_alg)));
 856 }
 857 #else
 858 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 859 {
 860         return 1;
 861 }
 862 #endif
 863
 864 /* A struct encoding bundle of transformations to apply to some set of flow.
 865  *
 866  * dst->child points to the next element of bundle.
 867  * dst->xfrm  points to an instanse of transformer.
 868  *
 869  * Due to unfortunate limitations of current routing cache, which we
 870  * have no time to fix, it mirrors struct rtable and bound to the same
 871  * routing key, including saddr,daddr. However, we can have many of
 872  * bundles differing by session id. All the bundles grow from a parent
 873  * policy rule.
 874  */
 875 struct xfrm_dst {
 876         union {
 877                 struct dst_entry        dst;
 878                 struct rtable           rt;
 879                 struct rt6_info         rt6;
 880         } u;
 881         struct dst_entry *route;
 882         struct flow_cache_object flo;
 883         struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
 884         int num_pols, num_xfrms;
 885 #ifdef CONFIG_XFRM_SUB_POLICY
 886         struct flowi *origin;
 887         struct xfrm_selector *partner;
 888 #endif
 889         u32 xfrm_genid;
 890         u32 policy_genid;
 891         u32 route_mtu_cached;
 892         u32 child_mtu_cached;
 893         u32 route_cookie;
 894         u32 path_cookie;
 895 };
 896
 897 #ifdef CONFIG_XFRM
 898 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
 899 {
 900         xfrm_pols_put(xdst->pols, xdst->num_pols);
 901         dst_release(xdst->route);
 902         if (likely(xdst->u.dst.xfrm))
 903                 xfrm_state_put(xdst->u.dst.xfrm);
 904 #ifdef CONFIG_XFRM_SUB_POLICY
 905         kfree(xdst->origin);
 906         xdst->origin = NULL;
 907         kfree(xdst->partner);
 908         xdst->partner = NULL;
 909 #endif
 910 }
 911 #endif
 912
 913 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
 914
 915 struct sec_path {
 916         atomic_t                refcnt;
 917         int                     len;
 918         struct xfrm_state       *xvec[XFRM_MAX_DEPTH];
 919 };
 920
 921 static inline struct sec_path *
 922 secpath_get(struct sec_path *sp)
 923 {
 924         if (sp)
 925                 atomic_inc(&sp->refcnt);
 926         return sp;
 927 }
 928
 929 extern void __secpath_destroy(struct sec_path *sp);
 930
 931 static inline void
 932 secpath_put(struct sec_path *sp)
 933 {
 934         if (sp && atomic_dec_and_test(&sp->refcnt))
 935                 __secpath_destroy(sp);
 936 }
 937
 938 extern struct sec_path *secpath_dup(struct sec_path *src);
 939
 940 static inline void
 941 secpath_reset(struct sk_buff *skb)
 942 {
 943 #ifdef CONFIG_XFRM
 944         secpath_put(skb->sp);
 945         skb->sp = NULL;
 946 #endif
 947 }
 948
 949 static inline int
 950 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
 951 {
 952         switch (family) {
 953         case AF_INET:
 954                 return addr->a4 == 0;
 955         case AF_INET6:
 956                 return ipv6_addr_any((struct in6_addr *)&addr->a6);
 957         }
 958         return 0;
 959 }
 960
 961 static inline int
 962 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 963 {
 964         return  (tmpl->saddr.a4 &&
 965                  tmpl->saddr.a4 != x->props.saddr.a4);
 966 }
 967
 968 static inline int
 969 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 970 {
 971         return  (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
 972                  ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
 973 }
 974
 975 static inline int
 976 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
 977 {
 978         switch (family) {
 979         case AF_INET:
 980                 return __xfrm4_state_addr_cmp(tmpl, x);
 981         case AF_INET6:
 982                 return __xfrm6_state_addr_cmp(tmpl, x);
 983         }
 984         return !0;
 985 }
 986
 987 #ifdef CONFIG_XFRM
 988 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
 989
 990 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
 991                                        struct sk_buff *skb,
 992                                        unsigned int family, int reverse)
 993 {
 994         struct net *net = dev_net(skb->dev);
 995         int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
 996
 997         if (sk && sk->sk_policy[XFRM_POLICY_IN])
 998                 return __xfrm_policy_check(sk, ndir, skb, family);
 999
1000         return  (!net->xfrm.policy_count[dir] && !skb->sp) ||
1001                 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1002                 __xfrm_policy_check(sk, ndir, skb, family);
1003 }
1004
1005 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1006 {
1007         return __xfrm_policy_check2(sk, dir, skb, family, 0);
1008 }
1009
1010 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1011 {
1012         return xfrm_policy_check(sk, dir, skb, AF_INET);
1013 }
1014
1015 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1016 {
1017         return xfrm_policy_check(sk, dir, skb, AF_INET6);
1018 }
1019
1020 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1021                                              struct sk_buff *skb)
1022 {
1023         return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1024 }
1025
1026 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1027                                              struct sk_buff *skb)
1028 {
1029         return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1030 }
1031
1032 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1033                                  unsigned int family, int reverse);
1034
1035 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1036                                       unsigned int family)
1037 {
1038         return __xfrm_decode_session(skb, fl, family, 0);
1039 }
1040
1041 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1042                                               struct flowi *fl,
1043                                               unsigned int family)
1044 {
1045         return __xfrm_decode_session(skb, fl, family, 1);
1046 }
1047
1048 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1049
1050 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1051 {
1052         struct net *net = dev_net(skb->dev);
1053
1054         return  !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1055                 (skb_dst(skb)->flags & DST_NOXFRM) ||
1056                 __xfrm_route_forward(skb, family);
1057 }
1058
1059 static inline int xfrm4_route_forward(struct sk_buff *skb)
1060 {
1061         return xfrm_route_forward(skb, AF_INET);
1062 }
1063
1064 static inline int xfrm6_route_forward(struct sk_buff *skb)
1065 {
1066         return xfrm_route_forward(skb, AF_INET6);
1067 }
1068
1069 extern int __xfrm_sk_clone_policy(struct sock *sk);
1070
1071 static inline int xfrm_sk_clone_policy(struct sock *sk)
1072 {
1073         if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1074                 return __xfrm_sk_clone_policy(sk);
1075         return 0;
1076 }
1077
1078 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1079
1080 static inline void xfrm_sk_free_policy(struct sock *sk)
1081 {
1082         if (unlikely(sk->sk_policy[0] != NULL)) {
1083                 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1084                 sk->sk_policy[0] = NULL;
1085         }
1086         if (unlikely(sk->sk_policy[1] != NULL)) {
1087                 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1088                 sk->sk_policy[1] = NULL;
1089         }
1090 }
1091
1092 #else
1093
1094 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1095 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1096 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1097 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1098 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1099 {
1100         return 1;
1101 }
1102 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1103 {
1104         return 1;
1105 }
1106 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1107 {
1108         return 1;
1109 }
1110 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1111                                               struct flowi *fl,
1112                                               unsigned int family)
1113 {
1114         return -ENOSYS;
1115 }
1116 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1117                                              struct sk_buff *skb)
1118 {
1119         return 1;
1120 }
1121 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1122                                              struct sk_buff *skb)
1123 {
1124         return 1;
1125 }
1126 #endif
1127
1128 static __inline__
1129 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1130 {
1131         switch (family){
1132         case AF_INET:
1133                 return (xfrm_address_t *)&fl->fl4_dst;
1134         case AF_INET6:
1135                 return (xfrm_address_t *)&fl->fl6_dst;
1136         }
1137         return NULL;
1138 }
1139
1140 static __inline__
1141 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1142 {
1143         switch (family){
1144         case AF_INET:
1145                 return (xfrm_address_t *)&fl->fl4_src;
1146         case AF_INET6:
1147                 return (xfrm_address_t *)&fl->fl6_src;
1148         }
1149         return NULL;
1150 }
1151
1152 static __inline__
1153 void xfrm_flowi_addr_get(struct flowi *fl,
1154                          xfrm_address_t *saddr, xfrm_address_t *daddr,
1155                          unsigned short family)
1156 {
1157         switch(family) {
1158         case AF_INET:
1159                 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1160                 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1161                 break;
1162         case AF_INET6:
1163                 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1164                 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1165                 break;
1166         }
1167 }
1168
1169 static __inline__ int
1170 __xfrm4_state_addr_check(struct xfrm_state *x,
1171                          xfrm_address_t *daddr, xfrm_address_t *saddr)
1172 {
1173         if (daddr->a4 == x->id.daddr.a4 &&
1174             (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1175                 return 1;
1176         return 0;
1177 }
1178
1179 static __inline__ int
1180 __xfrm6_state_addr_check(struct xfrm_state *x,
1181                          xfrm_address_t *daddr, xfrm_address_t *saddr)
1182 {
1183         if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1184             (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1185              ipv6_addr_any((struct in6_addr *)saddr) ||
1186              ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1187                 return 1;
1188         return 0;
1189 }
1190
1191 static __inline__ int
1192 xfrm_state_addr_check(struct xfrm_state *x,
1193                       xfrm_address_t *daddr, xfrm_address_t *saddr,
1194                       unsigned short family)
1195 {
1196         switch (family) {
1197         case AF_INET:
1198                 return __xfrm4_state_addr_check(x, daddr, saddr);
1199         case AF_INET6:
1200                 return __xfrm6_state_addr_check(x, daddr, saddr);
1201         }
1202         return 0;
1203 }
1204
1205 static __inline__ int
1206 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1207                            unsigned short family)
1208 {
1209         switch (family) {
1210         case AF_INET:
1211                 return __xfrm4_state_addr_check(x,
1212                                                 (xfrm_address_t *)&fl->fl4_dst,
1213                                                 (xfrm_address_t *)&fl->fl4_src);
1214         case AF_INET6:
1215                 return __xfrm6_state_addr_check(x,
1216                                                 (xfrm_address_t *)&fl->fl6_dst,
1217                                                 (xfrm_address_t *)&fl->fl6_src);
1218         }
1219         return 0;
1220 }
1221
1222 static inline int xfrm_state_kern(struct xfrm_state *x)
1223 {
1224         return atomic_read(&x->tunnel_users);
1225 }
1226
1227 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1228 {
1229         return (!userproto || proto == userproto ||
1230                 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1231                                                   proto == IPPROTO_ESP ||
1232                                                   proto == IPPROTO_COMP)));
1233 }
1234
1235 /*
1236  * xfrm algorithm information
1237  */
1238 struct xfrm_algo_aead_info {
1239         u16 icv_truncbits;
1240 };
1241
1242 struct xfrm_algo_auth_info {
1243         u16 icv_truncbits;
1244         u16 icv_fullbits;
1245 };
1246
1247 struct xfrm_algo_encr_info {
1248         u16 blockbits;
1249         u16 defkeybits;
1250 };
1251
1252 struct xfrm_algo_comp_info {
1253         u16 threshold;
1254 };
1255
1256 struct xfrm_algo_desc {
1257         char *name;
1258         char *compat;
1259         u8 available:1;
1260         union {
1261                 struct xfrm_algo_aead_info aead;
1262                 struct xfrm_algo_auth_info auth;
1263                 struct xfrm_algo_encr_info encr;
1264                 struct xfrm_algo_comp_info comp;
1265         } uinfo;
1266         struct sadb_alg desc;
1267 };
1268
1269 /* XFRM tunnel handlers.  */
1270 struct xfrm_tunnel {
1271         int (*handler)(struct sk_buff *skb);
1272         int (*err_handler)(struct sk_buff *skb, u32 info);
1273
1274         struct xfrm_tunnel __rcu *next;
1275         int priority;
1276 };
1277
1278 struct xfrm6_tunnel {
1279         int (*handler)(struct sk_buff *skb);
1280         int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1281                            u8 type, u8 code, int offset, __be32 info);
1282         struct xfrm6_tunnel __rcu *next;
1283         int priority;
1284 };
1285
1286 extern void xfrm_init(void);
1287 extern void xfrm4_init(int rt_hash_size);
1288 extern int xfrm_state_init(struct net *net);
1289 extern void xfrm_state_fini(struct net *net);
1290 extern void xfrm4_state_init(void);
1291 #ifdef CONFIG_XFRM
1292 extern int xfrm6_init(void);
1293 extern void xfrm6_fini(void);
1294 extern int xfrm6_state_init(void);
1295 extern void xfrm6_state_fini(void);
1296 #else
1297 static inline int xfrm6_init(void)
1298 {
1299         return 0;
1300 }
1301 static inline void xfrm6_fini(void)
1302 {
1303         ;
1304 }
1305 #endif
1306
1307 #ifdef CONFIG_XFRM_STATISTICS
1308 extern int xfrm_proc_init(struct net *net);
1309 extern void xfrm_proc_fini(struct net *net);
1310 #endif
1311
1312 extern int xfrm_sysctl_init(struct net *net);
1313 #ifdef CONFIG_SYSCTL
1314 extern void xfrm_sysctl_fini(struct net *net);
1315 #else
1316 static inline void xfrm_sysctl_fini(struct net *net)
1317 {
1318 }
1319 #endif
1320
1321 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1322 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1323                            int (*func)(struct xfrm_state *, int, void*), void *);
1324 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1325 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1326 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1327                                           struct flowi *fl, struct xfrm_tmpl *tmpl,
1328                                           struct xfrm_policy *pol, int *err,
1329                                           unsigned short family);
1330 extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1331                                                xfrm_address_t *daddr,
1332                                                xfrm_address_t *saddr,
1333                                                unsigned short family,
1334                                                u8 mode, u8 proto, u32 reqid);
1335 extern int xfrm_state_check_expire(struct xfrm_state *x);
1336 extern void xfrm_state_insert(struct xfrm_state *x);
1337 extern int xfrm_state_add(struct xfrm_state *x);
1338 extern int xfrm_state_update(struct xfrm_state *x);
1339 extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1340                                             xfrm_address_t *daddr, __be32 spi,
1341                                             u8 proto, unsigned short family);
1342 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1343                                                    xfrm_address_t *daddr,
1344                                                    xfrm_address_t *saddr,
1345                                                    u8 proto,
1346                                                    unsigned short family);
1347 #ifdef CONFIG_XFRM_SUB_POLICY
1348 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1349                           int n, unsigned short family);
1350 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1351                            int n, unsigned short family);
1352 #else
1353 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1354                                  int n, unsigned short family)
1355 {
1356         return -ENOSYS;
1357 }
1358
1359 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1360                                   int n, unsigned short family)
1361 {
1362         return -ENOSYS;
1363 }
1364 #endif
1365
1366 struct xfrmk_sadinfo {
1367         u32 sadhcnt; /* current hash bkts */
1368         u32 sadhmcnt; /* max allowed hash bkts */
1369         u32 sadcnt; /* current running count */
1370 };
1371
1372 struct xfrmk_spdinfo {
1373         u32 incnt;
1374         u32 outcnt;
1375         u32 fwdcnt;
1376         u32 inscnt;
1377         u32 outscnt;
1378         u32 fwdscnt;
1379         u32 spdhcnt;
1380         u32 spdhmcnt;
1381 };
1382
1383 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark,
1384                                               u32 seq);
1385 extern int xfrm_state_delete(struct xfrm_state *x);
1386 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1387 extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1388 extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1389 extern int xfrm_replay_check(struct xfrm_state *x,
1390                              struct sk_buff *skb, __be32 seq);
1391 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1392 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1393 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1394 extern int xfrm_init_state(struct xfrm_state *x);
1395 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1396 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1397                       int encap_type);
1398 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1399 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1400 extern int xfrm_output(struct sk_buff *skb);
1401 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1402 extern int xfrm4_extract_header(struct sk_buff *skb);
1403 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1404 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1405                            int encap_type);
1406 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1407 extern int xfrm4_rcv(struct sk_buff *skb);
1408
1409 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1410 {
1411         return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1412 }
1413
1414 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1415 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1416 extern int xfrm4_output(struct sk_buff *skb);
1417 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1418 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1419 extern int xfrm6_extract_header(struct sk_buff *skb);
1420 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1421 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1422 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1423 extern int xfrm6_rcv(struct sk_buff *skb);
1424 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1425                             xfrm_address_t *saddr, u8 proto);
1426 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1427 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1428 extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1429 extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, xfrm_address_t *saddr);
1430 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1431 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1432 extern int xfrm6_output(struct sk_buff *skb);
1433 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1434                                  u8 **prevhdr);
1435
1436 #ifdef CONFIG_XFRM
1437 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1438 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1439 #else
1440 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1441 {
1442         return -ENOPROTOOPT;
1443 }
1444
1445 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1446 {
1447         /* should not happen */
1448         kfree_skb(skb);
1449         return 0;
1450 }
1451 #endif
1452
1453 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1454
1455 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1456 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1457         int (*func)(struct xfrm_policy *, int, int, void*), void *);
1458 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1459 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1460 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1461                                           u8 type, int dir,
1462                                           struct xfrm_selector *sel,
1463                                           struct xfrm_sec_ctx *ctx, int delete,
1464                                           int *err);
1465 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err);
1466 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1467 u32 xfrm_get_acqseq(void);
1468 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1469 struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark,
1470                                  u8 mode, u32 reqid, u8 proto,
1471                                  xfrm_address_t *daddr,
1472                                  xfrm_address_t *saddr, int create,
1473                                  unsigned short family);
1474 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1475
1476 #ifdef CONFIG_XFRM_MIGRATE
1477 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1478                       struct xfrm_migrate *m, int num_bundles,
1479                       struct xfrm_kmaddress *k);
1480 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1481 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1482                                               struct xfrm_migrate *m);
1483 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1484                         struct xfrm_migrate *m, int num_bundles,
1485                         struct xfrm_kmaddress *k);
1486 #endif
1487
1488 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1489 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1490 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1491
1492 extern void xfrm_input_init(void);
1493 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1494
1495 extern void xfrm_probe_algs(void);
1496 extern int xfrm_count_auth_supported(void);
1497 extern int xfrm_count_enc_supported(void);
1498 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1499 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1500 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1501 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1502 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1503 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1504 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1505 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1506 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1507                                                    int probe);
1508
1509 struct hash_desc;
1510 struct scatterlist;
1511 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1512                               unsigned int);
1513
1514 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1515                                 int family)
1516 {
1517         switch (family) {
1518         default:
1519         case AF_INET:
1520                 return (__force u32)a->a4 - (__force u32)b->a4;
1521         case AF_INET6:
1522                 return ipv6_addr_cmp((struct in6_addr *)a,
1523                                      (struct in6_addr *)b);
1524         }
1525 }
1526
1527 static inline int xfrm_policy_id2dir(u32 index)
1528 {
1529         return index & 7;
1530 }
1531
1532 #ifdef CONFIG_XFRM
1533 static inline int xfrm_aevent_is_on(struct net *net)
1534 {
1535         struct sock *nlsk;
1536         int ret = 0;
1537
1538         rcu_read_lock();
1539         nlsk = rcu_dereference(net->xfrm.nlsk);
1540         if (nlsk)
1541                 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1542         rcu_read_unlock();
1543         return ret;
1544 }
1545 #endif
1546
1547 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1548 {
1549         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1550 }
1551
1552 static inline int xfrm_alg_auth_len(struct xfrm_algo_auth *alg)
1553 {
1554         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1555 }
1556
1557 #ifdef CONFIG_XFRM_MIGRATE
1558 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1559 {
1560         return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1561 }
1562
1563 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1564 {
1565         return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1566 }
1567
1568 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1569 {
1570         int i;
1571         for (i = 0; i < n; i++)
1572                 xfrm_state_put(*(states + i));
1573 }
1574
1575 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1576 {
1577         int i;
1578         for (i = 0; i < n; i++)
1579                 xfrm_state_delete(*(states + i));
1580 }
1581 #endif
1582
1583 #ifdef CONFIG_XFRM
1584 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1585 {
1586         return skb->sp->xvec[skb->sp->len - 1];
1587 }
1588 #endif
1589
1590 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1591 {
1592         if (attrs[XFRMA_MARK])
1593                 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1594         else
1595                 m->v = m->m = 0;
1596
1597         return m->v & m->m;
1598 }
1599
1600 static inline int xfrm_mark_put(struct sk_buff *skb, struct xfrm_mark *m)
1601 {
1602         if (m->m | m->v)
1603                 NLA_PUT(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1604         return 0;
1605
1606 nla_put_failure:
1607         return -1;
1608 }
1609
1610 #endif  /* _NET_XFRM_H */