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
  23 #include <linux/interrupt.h>
  24
  25 #ifdef CONFIG_XFRM_STATISTICS
  26 #include <net/snmp.h>
  27 #endif
  28
  29 #define XFRM_PROTO_ESP          50
  30 #define XFRM_PROTO_AH           51
  31 #define XFRM_PROTO_COMP         108
  32 #define XFRM_PROTO_IPIP         4
  33 #define XFRM_PROTO_IPV6         41
  34 #define XFRM_PROTO_ROUTING      IPPROTO_ROUTING
  35 #define XFRM_PROTO_DSTOPTS      IPPROTO_DSTOPTS
  36
  37 #define XFRM_ALIGN8(len)        (((len) + 7) & ~7)
  38 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
  39         MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
  40 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
  41         MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
  42
  43 #ifdef CONFIG_XFRM_STATISTICS
  44 #define XFRM_INC_STATS(net, field)      SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
  45 #define XFRM_INC_STATS_BH(net, field)   SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
  46 #define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
  47 #else
  48 #define XFRM_INC_STATS(net, field)      ((void)(net))
  49 #define XFRM_INC_STATS_BH(net, field)   ((void)(net))
  50 #define XFRM_INC_STATS_USER(net, field) ((void)(net))
  51 #endif
  52
  53 extern struct mutex xfrm_cfg_mutex;
  54
  55 /* Organization of SPD aka "XFRM rules"
  56    ------------------------------------
  57
  58    Basic objects:
  59    - policy rule, struct xfrm_policy (=SPD entry)
  60    - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
  61    - instance of a transformer, struct xfrm_state (=SA)
  62    - template to clone xfrm_state, struct xfrm_tmpl
  63
  64    SPD is plain linear list of xfrm_policy rules, ordered by priority.
  65    (To be compatible with existing pfkeyv2 implementations,
  66    many rules with priority of 0x7fffffff are allowed to exist and
  67    such rules are ordered in an unpredictable way, thanks to bsd folks.)
  68
  69    Lookup is plain linear search until the first match with selector.
  70
  71    If "action" is "block", then we prohibit the flow, otherwise:
  72    if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
  73    policy entry has list of up to XFRM_MAX_DEPTH transformations,
  74    described by templates xfrm_tmpl. Each template is resolved
  75    to a complete xfrm_state (see below) and we pack bundle of transformations
  76    to a dst_entry returned to requestor.
  77
  78    dst -. xfrm  .-> xfrm_state #1
  79     |---. child .-> dst -. xfrm .-> xfrm_state #2
  80                      |---. child .-> dst -. xfrm .-> xfrm_state #3
  81                                       |---. child .-> NULL
  82
  83    Bundles are cached at xrfm_policy struct (field ->bundles).
  84
  85
  86    Resolution of xrfm_tmpl
  87    -----------------------
  88    Template contains:
  89    1. ->mode            Mode: transport or tunnel
  90    2. ->id.proto        Protocol: AH/ESP/IPCOMP
  91    3. ->id.daddr        Remote tunnel endpoint, ignored for transport mode.
  92       Q: allow to resolve security gateway?
  93    4. ->id.spi          If not zero, static SPI.
  94    5. ->saddr           Local tunnel endpoint, ignored for transport mode.
  95    6. ->algos           List of allowed algos. Plain bitmask now.
  96       Q: ealgos, aalgos, calgos. What a mess...
  97    7. ->share           Sharing mode.
  98       Q: how to implement private sharing mode? To add struct sock* to
  99       flow id?
 100
 101    Having this template we search through SAD searching for entries
 102    with appropriate mode/proto/algo, permitted by selector.
 103    If no appropriate entry found, it is requested from key manager.
 104
 105    PROBLEMS:
 106    Q: How to find all the bundles referring to a physical path for
 107       PMTU discovery? Seems, dst should contain list of all parents...
 108       and enter to infinite locking hierarchy disaster.
 109       No! It is easier, we will not search for them, let them find us.
 110       We add genid to each dst plus pointer to genid of raw IP route,
 111       pmtu disc will update pmtu on raw IP route and increase its genid.
 112       dst_check() will see this for top level and trigger resyncing
 113       metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
 114  */
 115
 116 struct xfrm_state_walk {
 117         struct list_head        all;
 118         u8                      state;
 119         union {
 120                 u8              dying;
 121                 u8              proto;
 122         };
 123         u32                     seq;
 124 };
 125
 126 /* Full description of state of transformer. */
 127 struct xfrm_state {
 128 #ifdef CONFIG_NET_NS
 129         struct net              *xs_net;
 130 #endif
 131         union {
 132                 struct hlist_node       gclist;
 133                 struct hlist_node       bydst;
 134         };
 135         struct hlist_node       bysrc;
 136         struct hlist_node       byspi;
 137
 138         atomic_t                refcnt;
 139         spinlock_t              lock;
 140
 141         struct xfrm_id          id;
 142         struct xfrm_selector    sel;
 143
 144         u32                     genid;
 145
 146         /* Key manager bits */
 147         struct xfrm_state_walk  km;
 148
 149         /* Parameters of this state. */
 150         struct {
 151                 u32             reqid;
 152                 u8              mode;
 153                 u8              replay_window;
 154                 u8              aalgo, ealgo, calgo;
 155                 u8              flags;
 156                 u16             family;
 157                 xfrm_address_t  saddr;
 158                 int             header_len;
 159                 int             trailer_len;
 160         } props;
 161
 162         struct xfrm_lifetime_cfg lft;
 163
 164         /* Data for transformer */
 165         struct xfrm_algo_auth   *aalg;
 166         struct xfrm_algo        *ealg;
 167         struct xfrm_algo        *calg;
 168         struct xfrm_algo_aead   *aead;
 169
 170         /* Data for encapsulator */
 171         struct xfrm_encap_tmpl  *encap;
 172
 173         /* Data for care-of address */
 174         xfrm_address_t  *coaddr;
 175
 176         /* IPComp needs an IPIP tunnel for handling uncompressed packets */
 177         struct xfrm_state       *tunnel;
 178
 179         /* If a tunnel, number of users + 1 */
 180         atomic_t                tunnel_users;
 181
 182         /* State for replay detection */
 183         struct xfrm_replay_state replay;
 184
 185         /* Replay detection state at the time we sent the last notification */
 186         struct xfrm_replay_state preplay;
 187
 188         /* internal flag that only holds state for delayed aevent at the
 189          * moment
 190         */
 191         u32                     xflags;
 192
 193         /* Replay detection notification settings */
 194         u32                     replay_maxage;
 195         u32                     replay_maxdiff;
 196
 197         /* Replay detection notification timer */
 198         struct timer_list       rtimer;
 199
 200         /* Statistics */
 201         struct xfrm_stats       stats;
 202
 203         struct xfrm_lifetime_cur curlft;
 204         struct tasklet_hrtimer  mtimer;
 205
 206         /* Last used time */
 207         unsigned long           lastused;
 208
 209         /* Reference to data common to all the instances of this
 210          * transformer. */
 211         const struct xfrm_type  *type;
 212         struct xfrm_mode        *inner_mode;
 213         struct xfrm_mode        *inner_mode_iaf;
 214         struct xfrm_mode        *outer_mode;
 215
 216         /* Security context */
 217         struct xfrm_sec_ctx     *security;
 218
 219         /* Private data of this transformer, format is opaque,
 220          * interpreted by xfrm_type methods. */
 221         void                    *data;
 222 };
 223
 224 static inline struct net *xs_net(struct xfrm_state *x)
 225 {
 226         return read_pnet(&x->xs_net);
 227 }
 228
 229 /* xflags - make enum if more show up */
 230 #define XFRM_TIME_DEFER 1
 231
 232 enum {
 233         XFRM_STATE_VOID,
 234         XFRM_STATE_ACQ,
 235         XFRM_STATE_VALID,
 236         XFRM_STATE_ERROR,
 237         XFRM_STATE_EXPIRED,
 238         XFRM_STATE_DEAD
 239 };
 240
 241 /* callback structure passed from either netlink or pfkey */
 242 struct km_event {
 243         union {
 244                 u32 hard;
 245                 u32 proto;
 246                 u32 byid;
 247                 u32 aevent;
 248                 u32 type;
 249         } data;
 250
 251         u32     seq;
 252         u32     pid;
 253         u32     event;
 254         struct net *net;
 255 };
 256
 257 struct net_device;
 258 struct xfrm_type;
 259 struct xfrm_dst;
 260 struct xfrm_policy_afinfo {
 261         unsigned short          family;
 262         struct dst_ops          *dst_ops;
 263         void                    (*garbage_collect)(struct net *net);
 264         struct dst_entry        *(*dst_lookup)(struct net *net, int tos,
 265                                                xfrm_address_t *saddr,
 266                                                xfrm_address_t *daddr);
 267         int                     (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
 268         struct dst_entry        *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
 269         void                    (*decode_session)(struct sk_buff *skb,
 270                                                   struct flowi *fl,
 271                                                   int reverse);
 272         int                     (*get_tos)(struct flowi *fl);
 273         int                     (*init_path)(struct xfrm_dst *path,
 274                                              struct dst_entry *dst,
 275                                              int nfheader_len);
 276         int                     (*fill_dst)(struct xfrm_dst *xdst,
 277                                             struct net_device *dev);
 278 };
 279
 280 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
 281 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
 282 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
 283 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
 284
 285 struct xfrm_tmpl;
 286 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
 287 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
 288 extern int __xfrm_state_delete(struct xfrm_state *x);
 289
 290 struct xfrm_state_afinfo {
 291         unsigned int            family;
 292         unsigned int            proto;
 293         __be16                  eth_proto;
 294         struct module           *owner;
 295         const struct xfrm_type  *type_map[IPPROTO_MAX];
 296         struct xfrm_mode        *mode_map[XFRM_MODE_MAX];
 297         int                     (*init_flags)(struct xfrm_state *x);
 298         void                    (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
 299                                                 struct xfrm_tmpl *tmpl,
 300                                                 xfrm_address_t *daddr, xfrm_address_t *saddr);
 301         int                     (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
 302         int                     (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
 303         int                     (*output)(struct sk_buff *skb);
 304         int                     (*extract_input)(struct xfrm_state *x,
 305                                                  struct sk_buff *skb);
 306         int                     (*extract_output)(struct xfrm_state *x,
 307                                                   struct sk_buff *skb);
 308         int                     (*transport_finish)(struct sk_buff *skb,
 309                                                     int async);
 310 };
 311
 312 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
 313 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
 314
 315 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
 316
 317 struct xfrm_type {
 318         char                    *description;
 319         struct module           *owner;
 320         __u8                    proto;
 321         __u8                    flags;
 322 #define XFRM_TYPE_NON_FRAGMENT  1
 323 #define XFRM_TYPE_REPLAY_PROT   2
 324 #define XFRM_TYPE_LOCAL_COADDR  4
 325 #define XFRM_TYPE_REMOTE_COADDR 8
 326
 327         int                     (*init_state)(struct xfrm_state *x);
 328         void                    (*destructor)(struct xfrm_state *);
 329         int                     (*input)(struct xfrm_state *, struct sk_buff *skb);
 330         int                     (*output)(struct xfrm_state *, struct sk_buff *pskb);
 331         int                     (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
 332         int                     (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
 333         /* Estimate maximal size of result of transformation of a dgram */
 334         u32                     (*get_mtu)(struct xfrm_state *, int size);
 335 };
 336
 337 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
 338 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
 339
 340 struct xfrm_mode {
 341         /*
 342          * Remove encapsulation header.
 343          *
 344          * The IP header will be moved over the top of the encapsulation
 345          * header.
 346          *
 347          * On entry, the transport header shall point to where the IP header
 348          * should be and the network header shall be set to where the IP
 349          * header currently is.  skb->data shall point to the start of the
 350          * payload.
 351          */
 352         int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
 353
 354         /*
 355          * This is the actual input entry point.
 356          *
 357          * For transport mode and equivalent this would be identical to
 358          * input2 (which does not need to be set).  While tunnel mode
 359          * and equivalent would set this to the tunnel encapsulation function
 360          * xfrm4_prepare_input that would in turn call input2.
 361          */
 362         int (*input)(struct xfrm_state *x, struct sk_buff *skb);
 363
 364         /*
 365          * Add encapsulation header.
 366          *
 367          * On exit, the transport header will be set to the start of the
 368          * encapsulation header to be filled in by x->type->output and
 369          * the mac header will be set to the nextheader (protocol for
 370          * IPv4) field of the extension header directly preceding the
 371          * encapsulation header, or in its absence, that of the top IP
 372          * header.  The value of the network header will always point
 373          * to the top IP header while skb->data will point to the payload.
 374          */
 375         int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
 376
 377         /*
 378          * This is the actual output entry point.
 379          *
 380          * For transport mode and equivalent this would be identical to
 381          * output2 (which does not need to be set).  While tunnel mode
 382          * and equivalent would set this to a tunnel encapsulation function
 383          * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
 384          * call output2.
 385          */
 386         int (*output)(struct xfrm_state *x, struct sk_buff *skb);
 387
 388         struct xfrm_state_afinfo *afinfo;
 389         struct module *owner;
 390         unsigned int encap;
 391         int flags;
 392 };
 393
 394 /* Flags for xfrm_mode. */
 395 enum {
 396         XFRM_MODE_FLAG_TUNNEL = 1,
 397 };
 398
 399 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
 400 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
 401
 402 static inline int xfrm_af2proto(unsigned int family)
 403 {
 404         switch(family) {
 405         case AF_INET:
 406                 return IPPROTO_IPIP;
 407         case AF_INET6:
 408                 return IPPROTO_IPV6;
 409         default:
 410                 return 0;
 411         }
 412 }
 413
 414 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
 415 {
 416         if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
 417             (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
 418                 return x->inner_mode;
 419         else
 420                 return x->inner_mode_iaf;
 421 }
 422
 423 struct xfrm_tmpl {
 424 /* id in template is interpreted as:
 425  * daddr - destination of tunnel, may be zero for transport mode.
 426  * spi   - zero to acquire spi. Not zero if spi is static, then
 427  *         daddr must be fixed too.
 428  * proto - AH/ESP/IPCOMP
 429  */
 430         struct xfrm_id          id;
 431
 432 /* Source address of tunnel. Ignored, if it is not a tunnel. */
 433         xfrm_address_t          saddr;
 434
 435         unsigned short          encap_family;
 436
 437         __u32                   reqid;
 438
 439 /* Mode: transport, tunnel etc. */
 440         __u8                    mode;
 441
 442 /* Sharing mode: unique, this session only, this user only etc. */
 443         __u8                    share;
 444
 445 /* May skip this transfomration if no SA is found */
 446         __u8                    optional;
 447
 448 /* Skip aalgos/ealgos/calgos checks. */
 449         __u8                    allalgs;
 450
 451 /* Bit mask of algos allowed for acquisition */
 452         __u32                   aalgos;
 453         __u32                   ealgos;
 454         __u32                   calgos;
 455 };
 456
 457 #define XFRM_MAX_DEPTH          6
 458
 459 struct xfrm_policy_walk_entry {
 460         struct list_head        all;
 461         u8                      dead;
 462 };
 463
 464 struct xfrm_policy_walk {
 465         struct xfrm_policy_walk_entry walk;
 466         u8 type;
 467         u32 seq;
 468 };
 469
 470 struct xfrm_policy {
 471 #ifdef CONFIG_NET_NS
 472         struct net              *xp_net;
 473 #endif
 474         struct hlist_node       bydst;
 475         struct hlist_node       byidx;
 476
 477         /* This lock only affects elements except for entry. */
 478         rwlock_t                lock;
 479         atomic_t                refcnt;
 480         struct timer_list       timer;
 481
 482         u32                     priority;
 483         u32                     index;
 484         struct xfrm_selector    selector;
 485         struct xfrm_lifetime_cfg lft;
 486         struct xfrm_lifetime_cur curlft;
 487         struct dst_entry       *bundles;
 488         struct xfrm_policy_walk_entry walk;
 489         u8                      type;
 490         u8                      action;
 491         u8                      flags;
 492         u8                      xfrm_nr;
 493         u16                     family;
 494         struct xfrm_sec_ctx     *security;
 495         struct xfrm_tmpl        xfrm_vec[XFRM_MAX_DEPTH];
 496 };
 497
 498 static inline struct net *xp_net(struct xfrm_policy *xp)
 499 {
 500         return read_pnet(&xp->xp_net);
 501 }
 502
 503 struct xfrm_kmaddress {
 504         xfrm_address_t          local;
 505         xfrm_address_t          remote;
 506         u32                     reserved;
 507         u16                     family;
 508 };
 509
 510 struct xfrm_migrate {
 511         xfrm_address_t          old_daddr;
 512         xfrm_address_t          old_saddr;
 513         xfrm_address_t          new_daddr;
 514         xfrm_address_t          new_saddr;
 515         u8                      proto;
 516         u8                      mode;
 517         u16                     reserved;
 518         u32                     reqid;
 519         u16                     old_family;
 520         u16                     new_family;
 521 };
 522
 523 #define XFRM_KM_TIMEOUT                30
 524 /* which seqno */
 525 #define XFRM_REPLAY_SEQ         1
 526 #define XFRM_REPLAY_OSEQ        2
 527 #define XFRM_REPLAY_SEQ_MASK    3
 528 /* what happened */
 529 #define XFRM_REPLAY_UPDATE      XFRM_AE_CR
 530 #define XFRM_REPLAY_TIMEOUT     XFRM_AE_CE
 531
 532 /* default aevent timeout in units of 100ms */
 533 #define XFRM_AE_ETIME                   10
 534 /* Async Event timer multiplier */
 535 #define XFRM_AE_ETH_M                   10
 536 /* default seq threshold size */
 537 #define XFRM_AE_SEQT_SIZE               2
 538
 539 struct xfrm_mgr {
 540         struct list_head        list;
 541         char                    *id;
 542         int                     (*notify)(struct xfrm_state *x, struct km_event *c);
 543         int                     (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
 544         struct xfrm_policy      *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
 545         int                     (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
 546         int                     (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
 547         int                     (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
 548         int                     (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
 549 };
 550
 551 extern int xfrm_register_km(struct xfrm_mgr *km);
 552 extern int xfrm_unregister_km(struct xfrm_mgr *km);
 553
 554 /*
 555  * This structure is used for the duration where packets are being
 556  * transformed by IPsec.  As soon as the packet leaves IPsec the
 557  * area beyond the generic IP part may be overwritten.
 558  */
 559 struct xfrm_skb_cb {
 560         union {
 561                 struct inet_skb_parm h4;
 562                 struct inet6_skb_parm h6;
 563         } header;
 564
 565         /* Sequence number for replay protection. */
 566         union {
 567                 u64 output;
 568                 __be32 input;
 569         } seq;
 570 };
 571
 572 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
 573
 574 /*
 575  * This structure is used by the afinfo prepare_input/prepare_output functions
 576  * to transmit header information to the mode input/output functions.
 577  */
 578 struct xfrm_mode_skb_cb {
 579         union {
 580                 struct inet_skb_parm h4;
 581                 struct inet6_skb_parm h6;
 582         } header;
 583
 584         /* Copied from header for IPv4, always set to zero and DF for IPv6. */
 585         __be16 id;
 586         __be16 frag_off;
 587
 588         /* IP header length (excluding options or extension headers). */
 589         u8 ihl;
 590
 591         /* TOS for IPv4, class for IPv6. */
 592         u8 tos;
 593
 594         /* TTL for IPv4, hop limitfor IPv6. */
 595         u8 ttl;
 596
 597         /* Protocol for IPv4, NH for IPv6. */
 598         u8 protocol;
 599
 600         /* Option length for IPv4, zero for IPv6. */
 601         u8 optlen;
 602
 603         /* Used by IPv6 only, zero for IPv4. */
 604         u8 flow_lbl[3];
 605 };
 606
 607 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
 608
 609 /*
 610  * This structure is used by the input processing to locate the SPI and
 611  * related information.
 612  */
 613 struct xfrm_spi_skb_cb {
 614         union {
 615                 struct inet_skb_parm h4;
 616                 struct inet6_skb_parm h6;
 617         } header;
 618
 619         unsigned int daddroff;
 620         unsigned int family;
 621 };
 622
 623 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
 624
 625 /* Audit Information */
 626 struct xfrm_audit {
 627         u32     secid;
 628         uid_t   loginuid;
 629         u32     sessionid;
 630 };
 631
 632 #ifdef CONFIG_AUDITSYSCALL
 633 static inline struct audit_buffer *xfrm_audit_start(const char *op)
 634 {
 635         struct audit_buffer *audit_buf = NULL;
 636
 637         if (audit_enabled == 0)
 638                 return NULL;
 639         audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
 640                                     AUDIT_MAC_IPSEC_EVENT);
 641         if (audit_buf == NULL)
 642                 return NULL;
 643         audit_log_format(audit_buf, "op=%s", op);
 644         return audit_buf;
 645 }
 646
 647 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
 648                                              struct audit_buffer *audit_buf)
 649 {
 650         char *secctx;
 651         u32 secctx_len;
 652
 653         audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
 654         if (secid != 0 &&
 655             security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
 656                 audit_log_format(audit_buf, " subj=%s", secctx);
 657                 security_release_secctx(secctx, secctx_len);
 658         } else
 659                 audit_log_task_context(audit_buf);
 660 }
 661
 662 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 663                                   u32 auid, u32 ses, u32 secid);
 664 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 665                                   u32 auid, u32 ses, u32 secid);
 666 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
 667                                  u32 auid, u32 ses, u32 secid);
 668 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 669                                     u32 auid, u32 ses, u32 secid);
 670 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 671                                              struct sk_buff *skb);
 672 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
 673 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 674                                       __be32 net_spi, __be32 net_seq);
 675 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
 676                                      struct sk_buff *skb, u8 proto);
 677 #else
 678
 679 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 680                                   u32 auid, u32 ses, u32 secid)
 681 {
 682 }
 683
 684 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 685                                   u32 auid, u32 ses, u32 secid)
 686 {
 687 }
 688
 689 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
 690                                  u32 auid, u32 ses, u32 secid)
 691 {
 692 }
 693
 694 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 695                                     u32 auid, u32 ses, u32 secid)
 696 {
 697 }
 698
 699 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 700                                              struct sk_buff *skb)
 701 {
 702 }
 703
 704 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
 705                                       u16 family)
 706 {
 707 }
 708
 709 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 710                                       __be32 net_spi, __be32 net_seq)
 711 {
 712 }
 713
 714 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
 715                                      struct sk_buff *skb, u8 proto)
 716 {
 717 }
 718 #endif /* CONFIG_AUDITSYSCALL */
 719
 720 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
 721 {
 722         if (likely(policy != NULL))
 723                 atomic_inc(&policy->refcnt);
 724 }
 725
 726 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
 727
 728 static inline void xfrm_pol_put(struct xfrm_policy *policy)
 729 {
 730         if (atomic_dec_and_test(&policy->refcnt))
 731                 xfrm_policy_destroy(policy);
 732 }
 733
 734 #ifdef CONFIG_XFRM_SUB_POLICY
 735 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 736 {
 737         int i;
 738         for (i = npols - 1; i >= 0; --i)
 739                 xfrm_pol_put(pols[i]);
 740 }
 741 #else
 742 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 743 {
 744         xfrm_pol_put(pols[0]);
 745 }
 746 #endif
 747
 748 extern void __xfrm_state_destroy(struct xfrm_state *);
 749
 750 static inline void __xfrm_state_put(struct xfrm_state *x)
 751 {
 752         atomic_dec(&x->refcnt);
 753 }
 754
 755 static inline void xfrm_state_put(struct xfrm_state *x)
 756 {
 757         if (atomic_dec_and_test(&x->refcnt))
 758                 __xfrm_state_destroy(x);
 759 }
 760
 761 static inline void xfrm_state_hold(struct xfrm_state *x)
 762 {
 763         atomic_inc(&x->refcnt);
 764 }
 765
 766 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
 767 {
 768         __be32 *a1 = token1;
 769         __be32 *a2 = token2;
 770         int pdw;
 771         int pbi;
 772
 773         pdw = prefixlen >> 5;     /* num of whole __u32 in prefix */
 774         pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
 775
 776         if (pdw)
 777                 if (memcmp(a1, a2, pdw << 2))
 778                         return 0;
 779
 780         if (pbi) {
 781                 __be32 mask;
 782
 783                 mask = htonl((0xffffffff) << (32 - pbi));
 784
 785                 if ((a1[pdw] ^ a2[pdw]) & mask)
 786                         return 0;
 787         }
 788
 789         return 1;
 790 }
 791
 792 static __inline__
 793 __be16 xfrm_flowi_sport(struct flowi *fl)
 794 {
 795         __be16 port;
 796         switch(fl->proto) {
 797         case IPPROTO_TCP:
 798         case IPPROTO_UDP:
 799         case IPPROTO_UDPLITE:
 800         case IPPROTO_SCTP:
 801                 port = fl->fl_ip_sport;
 802                 break;
 803         case IPPROTO_ICMP:
 804         case IPPROTO_ICMPV6:
 805                 port = htons(fl->fl_icmp_type);
 806                 break;
 807         case IPPROTO_MH:
 808                 port = htons(fl->fl_mh_type);
 809                 break;
 810         default:
 811                 port = 0;       /*XXX*/
 812         }
 813         return port;
 814 }
 815
 816 static __inline__
 817 __be16 xfrm_flowi_dport(struct flowi *fl)
 818 {
 819         __be16 port;
 820         switch(fl->proto) {
 821         case IPPROTO_TCP:
 822         case IPPROTO_UDP:
 823         case IPPROTO_UDPLITE:
 824         case IPPROTO_SCTP:
 825                 port = fl->fl_ip_dport;
 826                 break;
 827         case IPPROTO_ICMP:
 828         case IPPROTO_ICMPV6:
 829                 port = htons(fl->fl_icmp_code);
 830                 break;
 831         default:
 832                 port = 0;       /*XXX*/
 833         }
 834         return port;
 835 }
 836
 837 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
 838                                unsigned short family);
 839
 840 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 841 /*      If neither has a context --> match
 842  *      Otherwise, both must have a context and the sids, doi, alg must match
 843  */
 844 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 845 {
 846         return ((!s1 && !s2) ||
 847                 (s1 && s2 &&
 848                  (s1->ctx_sid == s2->ctx_sid) &&
 849                  (s1->ctx_doi == s2->ctx_doi) &&
 850                  (s1->ctx_alg == s2->ctx_alg)));
 851 }
 852 #else
 853 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 854 {
 855         return 1;
 856 }
 857 #endif
 858
 859 /* A struct encoding bundle of transformations to apply to some set of flow.
 860  *
 861  * dst->child points to the next element of bundle.
 862  * dst->xfrm  points to an instanse of transformer.
 863  *
 864  * Due to unfortunate limitations of current routing cache, which we
 865  * have no time to fix, it mirrors struct rtable and bound to the same
 866  * routing key, including saddr,daddr. However, we can have many of
 867  * bundles differing by session id. All the bundles grow from a parent
 868  * policy rule.
 869  */
 870 struct xfrm_dst {
 871         union {
 872                 struct dst_entry        dst;
 873                 struct rtable           rt;
 874                 struct rt6_info         rt6;
 875         } u;
 876         struct dst_entry *route;
 877 #ifdef CONFIG_XFRM_SUB_POLICY
 878         struct flowi *origin;
 879         struct xfrm_selector *partner;
 880 #endif
 881         u32 genid;
 882         u32 route_mtu_cached;
 883         u32 child_mtu_cached;
 884         u32 route_cookie;
 885         u32 path_cookie;
 886 };
 887
 888 #ifdef CONFIG_XFRM
 889 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
 890 {
 891         dst_release(xdst->route);
 892         if (likely(xdst->u.dst.xfrm))
 893                 xfrm_state_put(xdst->u.dst.xfrm);
 894 #ifdef CONFIG_XFRM_SUB_POLICY
 895         kfree(xdst->origin);
 896         xdst->origin = NULL;
 897         kfree(xdst->partner);
 898         xdst->partner = NULL;
 899 #endif
 900 }
 901 #endif
 902
 903 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
 904
 905 struct sec_path {
 906         atomic_t                refcnt;
 907         int                     len;
 908         struct xfrm_state       *xvec[XFRM_MAX_DEPTH];
 909 };
 910
 911 static inline struct sec_path *
 912 secpath_get(struct sec_path *sp)
 913 {
 914         if (sp)
 915                 atomic_inc(&sp->refcnt);
 916         return sp;
 917 }
 918
 919 extern void __secpath_destroy(struct sec_path *sp);
 920
 921 static inline void
 922 secpath_put(struct sec_path *sp)
 923 {
 924         if (sp && atomic_dec_and_test(&sp->refcnt))
 925                 __secpath_destroy(sp);
 926 }
 927
 928 extern struct sec_path *secpath_dup(struct sec_path *src);
 929
 930 static inline void
 931 secpath_reset(struct sk_buff *skb)
 932 {
 933 #ifdef CONFIG_XFRM
 934         secpath_put(skb->sp);
 935         skb->sp = NULL;
 936 #endif
 937 }
 938
 939 static inline int
 940 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
 941 {
 942         switch (family) {
 943         case AF_INET:
 944                 return addr->a4 == 0;
 945         case AF_INET6:
 946                 return ipv6_addr_any((struct in6_addr *)&addr->a6);
 947         }
 948         return 0;
 949 }
 950
 951 static inline int
 952 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 953 {
 954         return  (tmpl->saddr.a4 &&
 955                  tmpl->saddr.a4 != x->props.saddr.a4);
 956 }
 957
 958 static inline int
 959 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 960 {
 961         return  (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
 962                  ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
 963 }
 964
 965 static inline int
 966 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
 967 {
 968         switch (family) {
 969         case AF_INET:
 970                 return __xfrm4_state_addr_cmp(tmpl, x);
 971         case AF_INET6:
 972                 return __xfrm6_state_addr_cmp(tmpl, x);
 973         }
 974         return !0;
 975 }
 976
 977 #ifdef CONFIG_XFRM
 978 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
 979
 980 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
 981                                        struct sk_buff *skb,
 982                                        unsigned int family, int reverse)
 983 {
 984         struct net *net = dev_net(skb->dev);
 985         int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
 986
 987         if (sk && sk->sk_policy[XFRM_POLICY_IN])
 988                 return __xfrm_policy_check(sk, ndir, skb, family);
 989
 990         return  (!net->xfrm.policy_count[dir] && !skb->sp) ||
 991                 (skb_dst(skb)->flags & DST_NOPOLICY) ||
 992                 __xfrm_policy_check(sk, ndir, skb, family);
 993 }
 994
 995 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
 996 {
 997         return __xfrm_policy_check2(sk, dir, skb, family, 0);
 998 }
 999
1000 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1001 {
1002         return xfrm_policy_check(sk, dir, skb, AF_INET);
1003 }
1004
1005 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1006 {
1007         return xfrm_policy_check(sk, dir, skb, AF_INET6);
1008 }
1009
1010 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1011                                              struct sk_buff *skb)
1012 {
1013         return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1014 }
1015
1016 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1017                                              struct sk_buff *skb)
1018 {
1019         return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1020 }
1021
1022 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1023                                  unsigned int family, int reverse);
1024
1025 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1026                                       unsigned int family)
1027 {
1028         return __xfrm_decode_session(skb, fl, family, 0);
1029 }
1030
1031 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1032                                               struct flowi *fl,
1033                                               unsigned int family)
1034 {
1035         return __xfrm_decode_session(skb, fl, family, 1);
1036 }
1037
1038 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1039
1040 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1041 {
1042         struct net *net = dev_net(skb->dev);
1043
1044         return  !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1045                 (skb_dst(skb)->flags & DST_NOXFRM) ||
1046                 __xfrm_route_forward(skb, family);
1047 }
1048
1049 static inline int xfrm4_route_forward(struct sk_buff *skb)
1050 {
1051         return xfrm_route_forward(skb, AF_INET);
1052 }
1053
1054 static inline int xfrm6_route_forward(struct sk_buff *skb)
1055 {
1056         return xfrm_route_forward(skb, AF_INET6);
1057 }
1058
1059 extern int __xfrm_sk_clone_policy(struct sock *sk);
1060
1061 static inline int xfrm_sk_clone_policy(struct sock *sk)
1062 {
1063         if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1064                 return __xfrm_sk_clone_policy(sk);
1065         return 0;
1066 }
1067
1068 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1069
1070 static inline void xfrm_sk_free_policy(struct sock *sk)
1071 {
1072         if (unlikely(sk->sk_policy[0] != NULL)) {
1073                 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1074                 sk->sk_policy[0] = NULL;
1075         }
1076         if (unlikely(sk->sk_policy[1] != NULL)) {
1077                 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1078                 sk->sk_policy[1] = NULL;
1079         }
1080 }
1081
1082 #else
1083
1084 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1085 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1086 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1087 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1088 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1089 {
1090         return 1;
1091 }
1092 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1093 {
1094         return 1;
1095 }
1096 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1097 {
1098         return 1;
1099 }
1100 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1101                                               struct flowi *fl,
1102                                               unsigned int family)
1103 {
1104         return -ENOSYS;
1105 }
1106 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1107                                              struct sk_buff *skb)
1108 {
1109         return 1;
1110 }
1111 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1112                                              struct sk_buff *skb)
1113 {
1114         return 1;
1115 }
1116 #endif
1117
1118 static __inline__
1119 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1120 {
1121         switch (family){
1122         case AF_INET:
1123                 return (xfrm_address_t *)&fl->fl4_dst;
1124         case AF_INET6:
1125                 return (xfrm_address_t *)&fl->fl6_dst;
1126         }
1127         return NULL;
1128 }
1129
1130 static __inline__
1131 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1132 {
1133         switch (family){
1134         case AF_INET:
1135                 return (xfrm_address_t *)&fl->fl4_src;
1136         case AF_INET6:
1137                 return (xfrm_address_t *)&fl->fl6_src;
1138         }
1139         return NULL;
1140 }
1141
1142 static __inline__
1143 void xfrm_flowi_addr_get(struct flowi *fl,
1144                          xfrm_address_t *saddr, xfrm_address_t *daddr,
1145                          unsigned short family)
1146 {
1147         switch(family) {
1148         case AF_INET:
1149                 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1150                 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1151                 break;
1152         case AF_INET6:
1153                 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1154                 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1155                 break;
1156         }
1157 }
1158
1159 static __inline__ int
1160 __xfrm4_state_addr_check(struct xfrm_state *x,
1161                          xfrm_address_t *daddr, xfrm_address_t *saddr)
1162 {
1163         if (daddr->a4 == x->id.daddr.a4 &&
1164             (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1165                 return 1;
1166         return 0;
1167 }
1168
1169 static __inline__ int
1170 __xfrm6_state_addr_check(struct xfrm_state *x,
1171                          xfrm_address_t *daddr, xfrm_address_t *saddr)
1172 {
1173         if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1174             (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1175              ipv6_addr_any((struct in6_addr *)saddr) ||
1176              ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1177                 return 1;
1178         return 0;
1179 }
1180
1181 static __inline__ int
1182 xfrm_state_addr_check(struct xfrm_state *x,
1183                       xfrm_address_t *daddr, xfrm_address_t *saddr,
1184                       unsigned short family)
1185 {
1186         switch (family) {
1187         case AF_INET:
1188                 return __xfrm4_state_addr_check(x, daddr, saddr);
1189         case AF_INET6:
1190                 return __xfrm6_state_addr_check(x, daddr, saddr);
1191         }
1192         return 0;
1193 }
1194
1195 static __inline__ int
1196 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1197                            unsigned short family)
1198 {
1199         switch (family) {
1200         case AF_INET:
1201                 return __xfrm4_state_addr_check(x,
1202                                                 (xfrm_address_t *)&fl->fl4_dst,
1203                                                 (xfrm_address_t *)&fl->fl4_src);
1204         case AF_INET6:
1205                 return __xfrm6_state_addr_check(x,
1206                                                 (xfrm_address_t *)&fl->fl6_dst,
1207                                                 (xfrm_address_t *)&fl->fl6_src);
1208         }
1209         return 0;
1210 }
1211
1212 static inline int xfrm_state_kern(struct xfrm_state *x)
1213 {
1214         return atomic_read(&x->tunnel_users);
1215 }
1216
1217 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1218 {
1219         return (!userproto || proto == userproto ||
1220                 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1221                                                   proto == IPPROTO_ESP ||
1222                                                   proto == IPPROTO_COMP)));
1223 }
1224
1225 /*
1226  * xfrm algorithm information
1227  */
1228 struct xfrm_algo_aead_info {
1229         u16 icv_truncbits;
1230 };
1231
1232 struct xfrm_algo_auth_info {
1233         u16 icv_truncbits;
1234         u16 icv_fullbits;
1235 };
1236
1237 struct xfrm_algo_encr_info {
1238         u16 blockbits;
1239         u16 defkeybits;
1240 };
1241
1242 struct xfrm_algo_comp_info {
1243         u16 threshold;
1244 };
1245
1246 struct xfrm_algo_desc {
1247         char *name;
1248         char *compat;
1249         u8 available:1;
1250         union {
1251                 struct xfrm_algo_aead_info aead;
1252                 struct xfrm_algo_auth_info auth;
1253                 struct xfrm_algo_encr_info encr;
1254                 struct xfrm_algo_comp_info comp;
1255         } uinfo;
1256         struct sadb_alg desc;
1257 };
1258
1259 /* XFRM tunnel handlers.  */
1260 struct xfrm_tunnel {
1261         int (*handler)(struct sk_buff *skb);
1262         int (*err_handler)(struct sk_buff *skb, __u32 info);
1263
1264         struct xfrm_tunnel *next;
1265         int priority;
1266 };
1267
1268 struct xfrm6_tunnel {
1269         int (*handler)(struct sk_buff *skb);
1270         int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1271                            u8 type, u8 code, int offset, __be32 info);
1272         struct xfrm6_tunnel *next;
1273         int priority;
1274 };
1275
1276 extern void xfrm_init(void);
1277 extern void xfrm4_init(int rt_hash_size);
1278 extern int xfrm_state_init(struct net *net);
1279 extern void xfrm_state_fini(struct net *net);
1280 extern void xfrm4_state_init(void);
1281 #ifdef CONFIG_XFRM
1282 extern int xfrm6_init(void);
1283 extern void xfrm6_fini(void);
1284 extern int xfrm6_state_init(void);
1285 extern void xfrm6_state_fini(void);
1286 #else
1287 static inline int xfrm6_init(void)
1288 {
1289         return 0;
1290 }
1291 static inline void xfrm6_fini(void)
1292 {
1293         ;
1294 }
1295 #endif
1296
1297 #ifdef CONFIG_XFRM_STATISTICS
1298 extern int xfrm_proc_init(struct net *net);
1299 extern void xfrm_proc_fini(struct net *net);
1300 #endif
1301
1302 extern int xfrm_sysctl_init(struct net *net);
1303 #ifdef CONFIG_SYSCTL
1304 extern void xfrm_sysctl_fini(struct net *net);
1305 #else
1306 static inline void xfrm_sysctl_fini(struct net *net)
1307 {
1308 }
1309 #endif
1310
1311 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1312 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1313                            int (*func)(struct xfrm_state *, int, void*), void *);
1314 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1315 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1316 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1317                                           struct flowi *fl, struct xfrm_tmpl *tmpl,
1318                                           struct xfrm_policy *pol, int *err,
1319                                           unsigned short family);
1320 extern struct xfrm_state * xfrm_stateonly_find(struct net *net,
1321                                                xfrm_address_t *daddr,
1322                                                xfrm_address_t *saddr,
1323                                                unsigned short family,
1324                                                u8 mode, u8 proto, u32 reqid);
1325 extern int xfrm_state_check_expire(struct xfrm_state *x);
1326 extern void xfrm_state_insert(struct xfrm_state *x);
1327 extern int xfrm_state_add(struct xfrm_state *x);
1328 extern int xfrm_state_update(struct xfrm_state *x);
1329 extern struct xfrm_state *xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1330 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1331 #ifdef CONFIG_XFRM_SUB_POLICY
1332 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1333                           int n, unsigned short family);
1334 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1335                            int n, unsigned short family);
1336 #else
1337 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1338                                  int n, unsigned short family)
1339 {
1340         return -ENOSYS;
1341 }
1342
1343 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1344                                   int n, unsigned short family)
1345 {
1346         return -ENOSYS;
1347 }
1348 #endif
1349
1350 struct xfrmk_sadinfo {
1351         u32 sadhcnt; /* current hash bkts */
1352         u32 sadhmcnt; /* max allowed hash bkts */
1353         u32 sadcnt; /* current running count */
1354 };
1355
1356 struct xfrmk_spdinfo {
1357         u32 incnt;
1358         u32 outcnt;
1359         u32 fwdcnt;
1360         u32 inscnt;
1361         u32 outscnt;
1362         u32 fwdscnt;
1363         u32 spdhcnt;
1364         u32 spdhmcnt;
1365 };
1366
1367 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 seq);
1368 extern int xfrm_state_delete(struct xfrm_state *x);
1369 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1370 extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1371 extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1372 extern int xfrm_replay_check(struct xfrm_state *x,
1373                              struct sk_buff *skb, __be32 seq);
1374 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1375 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1376 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1377 extern int xfrm_init_state(struct xfrm_state *x);
1378 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1379 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1380                       int encap_type);
1381 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1382 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1383 extern int xfrm_output(struct sk_buff *skb);
1384 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1385 extern int xfrm4_extract_header(struct sk_buff *skb);
1386 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1387 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1388                            int encap_type);
1389 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1390 extern int xfrm4_rcv(struct sk_buff *skb);
1391
1392 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1393 {
1394         return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1395 }
1396
1397 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1398 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1399 extern int xfrm4_output(struct sk_buff *skb);
1400 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1401 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1402 extern int xfrm6_extract_header(struct sk_buff *skb);
1403 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1404 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1405 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1406 extern int xfrm6_rcv(struct sk_buff *skb);
1407 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1408                             xfrm_address_t *saddr, u8 proto);
1409 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1410 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1411 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1412 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1413 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1414 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1415 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1416 extern int xfrm6_output(struct sk_buff *skb);
1417 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1418                                  u8 **prevhdr);
1419
1420 #ifdef CONFIG_XFRM
1421 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1422 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1423 #else
1424 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1425 {
1426         return -ENOPROTOOPT;
1427 }
1428
1429 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1430 {
1431         /* should not happen */
1432         kfree_skb(skb);
1433         return 0;
1434 }
1435 #endif
1436
1437 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1438
1439 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1440 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1441         int (*func)(struct xfrm_policy *, int, int, void*), void *);
1442 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1443 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1444 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u8 type, int dir,
1445                                           struct xfrm_selector *sel,
1446                                           struct xfrm_sec_ctx *ctx, int delete,
1447                                           int *err);
1448 struct xfrm_policy *xfrm_policy_byid(struct net *net, u8, int dir, u32 id, int delete, int *err);
1449 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1450 u32 xfrm_get_acqseq(void);
1451 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1452 struct xfrm_state * xfrm_find_acq(struct net *net, u8 mode, u32 reqid, u8 proto,
1453                                   xfrm_address_t *daddr, xfrm_address_t *saddr,
1454                                   int create, unsigned short family);
1455 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1456 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1457                           struct flowi *fl, int family, int strict);
1458
1459 #ifdef CONFIG_XFRM_MIGRATE
1460 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1461                       struct xfrm_migrate *m, int num_bundles,
1462                       struct xfrm_kmaddress *k);
1463 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1464 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1465                                               struct xfrm_migrate *m);
1466 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1467                         struct xfrm_migrate *m, int num_bundles,
1468                         struct xfrm_kmaddress *k);
1469 #endif
1470
1471 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1472 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1473 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1474
1475 extern void xfrm_input_init(void);
1476 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1477
1478 extern void xfrm_probe_algs(void);
1479 extern int xfrm_count_auth_supported(void);
1480 extern int xfrm_count_enc_supported(void);
1481 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1482 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1483 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1484 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1485 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1486 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1487 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1488 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1489 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1490                                                    int probe);
1491
1492 struct hash_desc;
1493 struct scatterlist;
1494 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1495                               unsigned int);
1496
1497 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1498                                 int family)
1499 {
1500         switch (family) {
1501         default:
1502         case AF_INET:
1503                 return (__force __u32)a->a4 - (__force __u32)b->a4;
1504         case AF_INET6:
1505                 return ipv6_addr_cmp((struct in6_addr *)a,
1506                                      (struct in6_addr *)b);
1507         }
1508 }
1509
1510 static inline int xfrm_policy_id2dir(u32 index)
1511 {
1512         return index & 7;
1513 }
1514
1515 #ifdef CONFIG_XFRM
1516 static inline int xfrm_aevent_is_on(struct net *net)
1517 {
1518         struct sock *nlsk;
1519         int ret = 0;
1520
1521         rcu_read_lock();
1522         nlsk = rcu_dereference(net->xfrm.nlsk);
1523         if (nlsk)
1524                 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1525         rcu_read_unlock();
1526         return ret;
1527 }
1528 #endif
1529
1530 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1531 {
1532         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1533 }
1534
1535 static inline int xfrm_alg_auth_len(struct xfrm_algo_auth *alg)
1536 {
1537         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1538 }
1539
1540 #ifdef CONFIG_XFRM_MIGRATE
1541 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1542 {
1543         return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1544 }
1545
1546 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1547 {
1548         return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1549 }
1550
1551 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1552 {
1553         int i;
1554         for (i = 0; i < n; i++)
1555                 xfrm_state_put(*(states + i));
1556 }
1557
1558 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1559 {
1560         int i;
1561         for (i = 0; i < n; i++)
1562                 xfrm_state_delete(*(states + i));
1563 }
1564 #endif
1565
1566 #ifdef CONFIG_XFRM
1567 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1568 {
1569         return skb->sp->xvec[skb->sp->len - 1];
1570 }
1571 #endif
1572
1573 #endif  /* _NET_XFRM_H */