include/net/xfrm.h

   1 #ifndef _NET_XFRM_H
   2 #define _NET_XFRM_H
   3
   4 #include <linux/compiler.h>
   5 #include <linux/xfrm.h>
   6 #include <linux/spinlock.h>
   7 #include <linux/list.h>
   8 #include <linux/skbuff.h>
   9 #include <linux/socket.h>
  10 #include <linux/pfkeyv2.h>
  11 #include <linux/ipsec.h>
  12 #include <linux/in6.h>
  13 #include <linux/mutex.h>
  14 #include <linux/audit.h>
  15
  16 #include <net/sock.h>
  17 #include <net/dst.h>
  18 #include <net/ip.h>
  19 #include <net/route.h>
  20 #include <net/ipv6.h>
  21 #include <net/ip6_fib.h>
  22 #ifdef CONFIG_XFRM_STATISTICS
  23 #include <net/snmp.h>
  24 #endif
  25
  26 #define XFRM_PROTO_ESP          50
  27 #define XFRM_PROTO_AH           51
  28 #define XFRM_PROTO_COMP         108
  29 #define XFRM_PROTO_IPIP         4
  30 #define XFRM_PROTO_IPV6         41
  31 #define XFRM_PROTO_ROUTING      IPPROTO_ROUTING
  32 #define XFRM_PROTO_DSTOPTS      IPPROTO_DSTOPTS
  33
  34 #define XFRM_ALIGN8(len)        (((len) + 7) & ~7)
  35 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
  36         MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
  37 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
  38         MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
  39
  40 #ifdef CONFIG_XFRM_STATISTICS
  41 DECLARE_SNMP_STAT(struct linux_xfrm_mib, xfrm_statistics);
  42 #define XFRM_INC_STATS(field)           SNMP_INC_STATS(xfrm_statistics, field)
  43 #define XFRM_INC_STATS_BH(field)        SNMP_INC_STATS_BH(xfrm_statistics, field)
  44 #define XFRM_INC_STATS_USER(field)      SNMP_INC_STATS_USER(xfrm_statistics, field)
  45 #else
  46 #define XFRM_INC_STATS(field)
  47 #define XFRM_INC_STATS_BH(field)
  48 #define XFRM_INC_STATS_USER(field)
  49 #endif
  50
  51 extern struct sock *xfrm_nl;
  52 extern u32 sysctl_xfrm_aevent_etime;
  53 extern u32 sysctl_xfrm_aevent_rseqth;
  54 extern int sysctl_xfrm_larval_drop;
  55 extern u32 sysctl_xfrm_acq_expires;
  56
  57 extern struct mutex xfrm_cfg_mutex;
  58
  59 /* Organization of SPD aka "XFRM rules"
  60    ------------------------------------
  61
  62    Basic objects:
  63    - policy rule, struct xfrm_policy (=SPD entry)
  64    - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
  65    - instance of a transformer, struct xfrm_state (=SA)
  66    - template to clone xfrm_state, struct xfrm_tmpl
  67
  68    SPD is plain linear list of xfrm_policy rules, ordered by priority.
  69    (To be compatible with existing pfkeyv2 implementations,
  70    many rules with priority of 0x7fffffff are allowed to exist and
  71    such rules are ordered in an unpredictable way, thanks to bsd folks.)
  72
  73    Lookup is plain linear search until the first match with selector.
  74
  75    If "action" is "block", then we prohibit the flow, otherwise:
  76    if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
  77    policy entry has list of up to XFRM_MAX_DEPTH transformations,
  78    described by templates xfrm_tmpl. Each template is resolved
  79    to a complete xfrm_state (see below) and we pack bundle of transformations
  80    to a dst_entry returned to requestor.
  81
  82    dst -. xfrm  .-> xfrm_state #1
  83     |---. child .-> dst -. xfrm .-> xfrm_state #2
  84                      |---. child .-> dst -. xfrm .-> xfrm_state #3
  85                                       |---. child .-> NULL
  86
  87    Bundles are cached at xrfm_policy struct (field ->bundles).
  88
  89
  90    Resolution of xrfm_tmpl
  91    -----------------------
  92    Template contains:
  93    1. ->mode            Mode: transport or tunnel
  94    2. ->id.proto        Protocol: AH/ESP/IPCOMP
  95    3. ->id.daddr        Remote tunnel endpoint, ignored for transport mode.
  96       Q: allow to resolve security gateway?
  97    4. ->id.spi          If not zero, static SPI.
  98    5. ->saddr           Local tunnel endpoint, ignored for transport mode.
  99    6. ->algos           List of allowed algos. Plain bitmask now.
 100       Q: ealgos, aalgos, calgos. What a mess...
 101    7. ->share           Sharing mode.
 102       Q: how to implement private sharing mode? To add struct sock* to
 103       flow id?
 104
 105    Having this template we search through SAD searching for entries
 106    with appropriate mode/proto/algo, permitted by selector.
 107    If no appropriate entry found, it is requested from key manager.
 108
 109    PROBLEMS:
 110    Q: How to find all the bundles referring to a physical path for
 111       PMTU discovery? Seems, dst should contain list of all parents...
 112       and enter to infinite locking hierarchy disaster.
 113       No! It is easier, we will not search for them, let them find us.
 114       We add genid to each dst plus pointer to genid of raw IP route,
 115       pmtu disc will update pmtu on raw IP route and increase its genid.
 116       dst_check() will see this for top level and trigger resyncing
 117       metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
 118  */
 119
 120 /* Full description of state of transformer. */
 121 struct xfrm_state
 122 {
 123         struct list_head        all;
 124         union {
 125                 struct list_head        gclist;
 126                 struct hlist_node       bydst;
 127         };
 128         struct hlist_node       bysrc;
 129         struct hlist_node       byspi;
 130
 131         atomic_t                refcnt;
 132         spinlock_t              lock;
 133
 134         struct xfrm_id          id;
 135         struct xfrm_selector    sel;
 136
 137         u32                     genid;
 138
 139         /* Key manger bits */
 140         struct {
 141                 u8              state;
 142                 u8              dying;
 143                 u32             seq;
 144         } km;
 145
 146         /* Parameters of this state. */
 147         struct {
 148                 u32             reqid;
 149                 u8              mode;
 150                 u8              replay_window;
 151                 u8              aalgo, ealgo, calgo;
 152                 u8              flags;
 153                 u16             family;
 154                 xfrm_address_t  saddr;
 155                 int             header_len;
 156                 int             trailer_len;
 157         } props;
 158
 159         struct xfrm_lifetime_cfg lft;
 160
 161         /* Data for transformer */
 162         struct xfrm_algo        *aalg;
 163         struct xfrm_algo        *ealg;
 164         struct xfrm_algo        *calg;
 165         struct xfrm_algo_aead   *aead;
 166
 167         /* Data for encapsulator */
 168         struct xfrm_encap_tmpl  *encap;
 169
 170         /* Data for care-of address */
 171         xfrm_address_t  *coaddr;
 172
 173         /* IPComp needs an IPIP tunnel for handling uncompressed packets */
 174         struct xfrm_state       *tunnel;
 175
 176         /* If a tunnel, number of users + 1 */
 177         atomic_t                tunnel_users;
 178
 179         /* State for replay detection */
 180         struct xfrm_replay_state replay;
 181
 182         /* Replay detection state at the time we sent the last notification */
 183         struct xfrm_replay_state preplay;
 184
 185         /* internal flag that only holds state for delayed aevent at the
 186          * moment
 187         */
 188         u32                     xflags;
 189
 190         /* Replay detection notification settings */
 191         u32                     replay_maxage;
 192         u32                     replay_maxdiff;
 193
 194         /* Replay detection notification timer */
 195         struct timer_list       rtimer;
 196
 197         /* Statistics */
 198         struct xfrm_stats       stats;
 199
 200         struct xfrm_lifetime_cur curlft;
 201         struct timer_list       timer;
 202
 203         /* Last used time */
 204         unsigned long           lastused;
 205
 206         /* Reference to data common to all the instances of this
 207          * transformer. */
 208         const struct xfrm_type  *type;
 209         struct xfrm_mode        *inner_mode;
 210         struct xfrm_mode        *inner_mode_iaf;
 211         struct xfrm_mode        *outer_mode;
 212
 213         /* Security context */
 214         struct xfrm_sec_ctx     *security;
 215
 216         /* Private data of this transformer, format is opaque,
 217          * interpreted by xfrm_type methods. */
 218         void                    *data;
 219 };
 220
 221 /* xflags - make enum if more show up */
 222 #define XFRM_TIME_DEFER 1
 223
 224 enum {
 225         XFRM_STATE_VOID,
 226         XFRM_STATE_ACQ,
 227         XFRM_STATE_VALID,
 228         XFRM_STATE_ERROR,
 229         XFRM_STATE_EXPIRED,
 230         XFRM_STATE_DEAD
 231 };
 232
 233 /* callback structure passed from either netlink or pfkey */
 234 struct km_event
 235 {
 236         union {
 237                 u32 hard;
 238                 u32 proto;
 239                 u32 byid;
 240                 u32 aevent;
 241                 u32 type;
 242         } data;
 243
 244         u32     seq;
 245         u32     pid;
 246         u32     event;
 247 };
 248
 249 struct net_device;
 250 struct xfrm_type;
 251 struct xfrm_dst;
 252 struct xfrm_policy_afinfo {
 253         unsigned short          family;
 254         struct dst_ops          *dst_ops;
 255         void                    (*garbage_collect)(void);
 256         struct dst_entry        *(*dst_lookup)(int tos, xfrm_address_t *saddr,
 257                                                xfrm_address_t *daddr);
 258         int                     (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
 259         struct dst_entry        *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
 260         void                    (*decode_session)(struct sk_buff *skb,
 261                                                   struct flowi *fl,
 262                                                   int reverse);
 263         int                     (*get_tos)(struct flowi *fl);
 264         int                     (*init_path)(struct xfrm_dst *path,
 265                                              struct dst_entry *dst,
 266                                              int nfheader_len);
 267         int                     (*fill_dst)(struct xfrm_dst *xdst,
 268                                             struct net_device *dev);
 269 };
 270
 271 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
 272 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
 273 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
 274 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
 275
 276 struct xfrm_tmpl;
 277 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
 278 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
 279 extern int __xfrm_state_delete(struct xfrm_state *x);
 280
 281 struct xfrm_state_afinfo {
 282         unsigned int            family;
 283         unsigned int            proto;
 284         __be16                  eth_proto;
 285         struct module           *owner;
 286         const struct xfrm_type  *type_map[IPPROTO_MAX];
 287         struct xfrm_mode        *mode_map[XFRM_MODE_MAX];
 288         int                     (*init_flags)(struct xfrm_state *x);
 289         void                    (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
 290                                                 struct xfrm_tmpl *tmpl,
 291                                                 xfrm_address_t *daddr, xfrm_address_t *saddr);
 292         int                     (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
 293         int                     (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
 294         int                     (*output)(struct sk_buff *skb);
 295         int                     (*extract_input)(struct xfrm_state *x,
 296                                                  struct sk_buff *skb);
 297         int                     (*extract_output)(struct xfrm_state *x,
 298                                                   struct sk_buff *skb);
 299         int                     (*transport_finish)(struct sk_buff *skb,
 300                                                     int async);
 301 };
 302
 303 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
 304 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
 305
 306 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
 307
 308 struct xfrm_type
 309 {
 310         char                    *description;
 311         struct module           *owner;
 312         __u8                    proto;
 313         __u8                    flags;
 314 #define XFRM_TYPE_NON_FRAGMENT  1
 315 #define XFRM_TYPE_REPLAY_PROT   2
 316 #define XFRM_TYPE_LOCAL_COADDR  4
 317 #define XFRM_TYPE_REMOTE_COADDR 8
 318
 319         int                     (*init_state)(struct xfrm_state *x);
 320         void                    (*destructor)(struct xfrm_state *);
 321         int                     (*input)(struct xfrm_state *, struct sk_buff *skb);
 322         int                     (*output)(struct xfrm_state *, struct sk_buff *pskb);
 323         int                     (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
 324         int                     (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
 325         /* Estimate maximal size of result of transformation of a dgram */
 326         u32                     (*get_mtu)(struct xfrm_state *, int size);
 327 };
 328
 329 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
 330 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
 331
 332 struct xfrm_mode {
 333         /*
 334          * Remove encapsulation header.
 335          *
 336          * The IP header will be moved over the top of the encapsulation
 337          * header.
 338          *
 339          * On entry, the transport header shall point to where the IP header
 340          * should be and the network header shall be set to where the IP
 341          * header currently is.  skb->data shall point to the start of the
 342          * payload.
 343          */
 344         int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
 345
 346         /*
 347          * This is the actual input entry point.
 348          *
 349          * For transport mode and equivalent this would be identical to
 350          * input2 (which does not need to be set).  While tunnel mode
 351          * and equivalent would set this to the tunnel encapsulation function
 352          * xfrm4_prepare_input that would in turn call input2.
 353          */
 354         int (*input)(struct xfrm_state *x, struct sk_buff *skb);
 355
 356         /*
 357          * Add encapsulation header.
 358          *
 359          * On exit, the transport header will be set to the start of the
 360          * encapsulation header to be filled in by x->type->output and
 361          * the mac header will be set to the nextheader (protocol for
 362          * IPv4) field of the extension header directly preceding the
 363          * encapsulation header, or in its absence, that of the top IP
 364          * header.  The value of the network header will always point
 365          * to the top IP header while skb->data will point to the payload.
 366          */
 367         int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
 368
 369         /*
 370          * This is the actual output entry point.
 371          *
 372          * For transport mode and equivalent this would be identical to
 373          * output2 (which does not need to be set).  While tunnel mode
 374          * and equivalent would set this to a tunnel encapsulation function
 375          * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
 376          * call output2.
 377          */
 378         int (*output)(struct xfrm_state *x, struct sk_buff *skb);
 379
 380         struct xfrm_state_afinfo *afinfo;
 381         struct module *owner;
 382         unsigned int encap;
 383         int flags;
 384 };
 385
 386 /* Flags for xfrm_mode. */
 387 enum {
 388         XFRM_MODE_FLAG_TUNNEL = 1,
 389 };
 390
 391 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
 392 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
 393
 394 static inline int xfrm_af2proto(unsigned int family)
 395 {
 396         switch(family) {
 397         case AF_INET:
 398                 return IPPROTO_IPIP;
 399         case AF_INET6:
 400                 return IPPROTO_IPV6;
 401         default:
 402                 return 0;
 403         }
 404 }
 405
 406 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
 407 {
 408         if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
 409             (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
 410                 return x->inner_mode;
 411         else
 412                 return x->inner_mode_iaf;
 413 }
 414
 415 struct xfrm_tmpl
 416 {
 417 /* id in template is interpreted as:
 418  * daddr - destination of tunnel, may be zero for transport mode.
 419  * spi   - zero to acquire spi. Not zero if spi is static, then
 420  *         daddr must be fixed too.
 421  * proto - AH/ESP/IPCOMP
 422  */
 423         struct xfrm_id          id;
 424
 425 /* Source address of tunnel. Ignored, if it is not a tunnel. */
 426         xfrm_address_t          saddr;
 427
 428         unsigned short          encap_family;
 429
 430         __u32                   reqid;
 431
 432 /* Mode: transport, tunnel etc. */
 433         __u8                    mode;
 434
 435 /* Sharing mode: unique, this session only, this user only etc. */
 436         __u8                    share;
 437
 438 /* May skip this transfomration if no SA is found */
 439         __u8                    optional;
 440
 441 /* Skip aalgos/ealgos/calgos checks. */
 442         __u8                    allalgs;
 443
 444 /* Bit mask of algos allowed for acquisition */
 445         __u32                   aalgos;
 446         __u32                   ealgos;
 447         __u32                   calgos;
 448 };
 449
 450 #define XFRM_MAX_DEPTH          6
 451
 452 struct xfrm_policy
 453 {
 454         struct xfrm_policy      *next;
 455         struct list_head        bytype;
 456         struct hlist_node       bydst;
 457         struct hlist_node       byidx;
 458
 459         /* This lock only affects elements except for entry. */
 460         rwlock_t                lock;
 461         atomic_t                refcnt;
 462         struct timer_list       timer;
 463
 464         u32                     priority;
 465         u32                     index;
 466         struct xfrm_selector    selector;
 467         struct xfrm_lifetime_cfg lft;
 468         struct xfrm_lifetime_cur curlft;
 469         struct dst_entry       *bundles;
 470         u16                     family;
 471         u8                      type;
 472         u8                      action;
 473         u8                      flags;
 474         u8                      dead;
 475         u8                      xfrm_nr;
 476         /* XXX 1 byte hole, try to pack */
 477         struct xfrm_sec_ctx     *security;
 478         struct xfrm_tmpl        xfrm_vec[XFRM_MAX_DEPTH];
 479 };
 480
 481 struct xfrm_migrate {
 482         xfrm_address_t          old_daddr;
 483         xfrm_address_t          old_saddr;
 484         xfrm_address_t          new_daddr;
 485         xfrm_address_t          new_saddr;
 486         u8                      proto;
 487         u8                      mode;
 488         u16                     reserved;
 489         u32                     reqid;
 490         u16                     old_family;
 491         u16                     new_family;
 492 };
 493
 494 #define XFRM_KM_TIMEOUT                30
 495 /* which seqno */
 496 #define XFRM_REPLAY_SEQ         1
 497 #define XFRM_REPLAY_OSEQ        2
 498 #define XFRM_REPLAY_SEQ_MASK    3
 499 /* what happened */
 500 #define XFRM_REPLAY_UPDATE      XFRM_AE_CR
 501 #define XFRM_REPLAY_TIMEOUT     XFRM_AE_CE
 502
 503 /* default aevent timeout in units of 100ms */
 504 #define XFRM_AE_ETIME                   10
 505 /* Async Event timer multiplier */
 506 #define XFRM_AE_ETH_M                   10
 507 /* default seq threshold size */
 508 #define XFRM_AE_SEQT_SIZE               2
 509
 510 struct xfrm_mgr
 511 {
 512         struct list_head        list;
 513         char                    *id;
 514         int                     (*notify)(struct xfrm_state *x, struct km_event *c);
 515         int                     (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
 516         struct xfrm_policy      *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
 517         int                     (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
 518         int                     (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
 519         int                     (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
 520         int                     (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
 521 };
 522
 523 extern int xfrm_register_km(struct xfrm_mgr *km);
 524 extern int xfrm_unregister_km(struct xfrm_mgr *km);
 525
 526 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
 527
 528 /*
 529  * This structure is used for the duration where packets are being
 530  * transformed by IPsec.  As soon as the packet leaves IPsec the
 531  * area beyond the generic IP part may be overwritten.
 532  */
 533 struct xfrm_skb_cb {
 534         union {
 535                 struct inet_skb_parm h4;
 536                 struct inet6_skb_parm h6;
 537         } header;
 538
 539         /* Sequence number for replay protection. */
 540         union {
 541                 u64 output;
 542                 __be32 input;
 543         } seq;
 544 };
 545
 546 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
 547
 548 /*
 549  * This structure is used by the afinfo prepare_input/prepare_output functions
 550  * to transmit header information to the mode input/output functions.
 551  */
 552 struct xfrm_mode_skb_cb {
 553         union {
 554                 struct inet_skb_parm h4;
 555                 struct inet6_skb_parm h6;
 556         } header;
 557
 558         /* Copied from header for IPv4, always set to zero and DF for IPv6. */
 559         __be16 id;
 560         __be16 frag_off;
 561
 562         /* IP header length (excluding options or extension headers). */
 563         u8 ihl;
 564
 565         /* TOS for IPv4, class for IPv6. */
 566         u8 tos;
 567
 568         /* TTL for IPv4, hop limitfor IPv6. */
 569         u8 ttl;
 570
 571         /* Protocol for IPv4, NH for IPv6. */
 572         u8 protocol;
 573
 574         /* Option length for IPv4, zero for IPv6. */
 575         u8 optlen;
 576
 577         /* Used by IPv6 only, zero for IPv4. */
 578         u8 flow_lbl[3];
 579 };
 580
 581 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
 582
 583 /*
 584  * This structure is used by the input processing to locate the SPI and
 585  * related information.
 586  */
 587 struct xfrm_spi_skb_cb {
 588         union {
 589                 struct inet_skb_parm h4;
 590                 struct inet6_skb_parm h6;
 591         } header;
 592
 593         unsigned int daddroff;
 594         unsigned int family;
 595 };
 596
 597 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
 598
 599 /* Audit Information */
 600 struct xfrm_audit
 601 {
 602         u32     secid;
 603         uid_t   loginuid;
 604         u32     sessionid;
 605 };
 606
 607 #ifdef CONFIG_AUDITSYSCALL
 608 static inline struct audit_buffer *xfrm_audit_start(const char *op)
 609 {
 610         struct audit_buffer *audit_buf = NULL;
 611
 612         if (audit_enabled == 0)
 613                 return NULL;
 614         audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
 615                                     AUDIT_MAC_IPSEC_EVENT);
 616         if (audit_buf == NULL)
 617                 return NULL;
 618         audit_log_format(audit_buf, "op=%s", op);
 619         return audit_buf;
 620 }
 621
 622 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
 623                                              struct audit_buffer *audit_buf)
 624 {
 625         char *secctx;
 626         u32 secctx_len;
 627
 628         audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
 629         if (secid != 0 &&
 630             security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
 631                 audit_log_format(audit_buf, " subj=%s", secctx);
 632                 security_release_secctx(secctx, secctx_len);
 633         } else
 634                 audit_log_task_context(audit_buf);
 635 }
 636
 637 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 638                                   u32 auid, u32 ses, u32 secid);
 639 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 640                                   u32 auid, u32 ses, u32 secid);
 641 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
 642                                  u32 auid, u32 ses, u32 secid);
 643 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 644                                     u32 auid, u32 ses, u32 secid);
 645 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 646                                              struct sk_buff *skb);
 647 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
 648 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 649                                       __be32 net_spi, __be32 net_seq);
 650 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
 651                                      struct sk_buff *skb, u8 proto);
 652 #else
 653
 654 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 655                                   u32 auid, u32 ses, u32 secid)
 656 {
 657 }
 658
 659 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 660                                   u32 auid, u32 ses, u32 secid)
 661 {
 662 }
 663
 664 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
 665                                  u32 auid, u32 ses, u32 secid)
 666 {
 667 }
 668
 669 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 670                                     u32 auid, u32 ses, u32 secid)
 671 {
 672 }
 673
 674 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 675                                              struct sk_buff *skb)
 676 {
 677 }
 678
 679 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
 680                                       u16 family)
 681 {
 682 }
 683
 684 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 685                                       __be32 net_spi, __be32 net_seq)
 686 {
 687 }
 688
 689 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
 690                                      struct sk_buff *skb, u8 proto)
 691 {
 692 }
 693 #endif /* CONFIG_AUDITSYSCALL */
 694
 695 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
 696 {
 697         if (likely(policy != NULL))
 698                 atomic_inc(&policy->refcnt);
 699 }
 700
 701 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
 702
 703 static inline void xfrm_pol_put(struct xfrm_policy *policy)
 704 {
 705         if (atomic_dec_and_test(&policy->refcnt))
 706                 xfrm_policy_destroy(policy);
 707 }
 708
 709 #ifdef CONFIG_XFRM_SUB_POLICY
 710 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 711 {
 712         int i;
 713         for (i = npols - 1; i >= 0; --i)
 714                 xfrm_pol_put(pols[i]);
 715 }
 716 #else
 717 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 718 {
 719         xfrm_pol_put(pols[0]);
 720 }
 721 #endif
 722
 723 extern void __xfrm_state_destroy(struct xfrm_state *);
 724
 725 static inline void __xfrm_state_put(struct xfrm_state *x)
 726 {
 727         atomic_dec(&x->refcnt);
 728 }
 729
 730 static inline void xfrm_state_put(struct xfrm_state *x)
 731 {
 732         if (atomic_dec_and_test(&x->refcnt))
 733                 __xfrm_state_destroy(x);
 734 }
 735
 736 static inline void xfrm_state_hold(struct xfrm_state *x)
 737 {
 738         atomic_inc(&x->refcnt);
 739 }
 740
 741 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
 742 {
 743         __be32 *a1 = token1;
 744         __be32 *a2 = token2;
 745         int pdw;
 746         int pbi;
 747
 748         pdw = prefixlen >> 5;     /* num of whole __u32 in prefix */
 749         pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
 750
 751         if (pdw)
 752                 if (memcmp(a1, a2, pdw << 2))
 753                         return 0;
 754
 755         if (pbi) {
 756                 __be32 mask;
 757
 758                 mask = htonl((0xffffffff) << (32 - pbi));
 759
 760                 if ((a1[pdw] ^ a2[pdw]) & mask)
 761                         return 0;
 762         }
 763
 764         return 1;
 765 }
 766
 767 static __inline__
 768 __be16 xfrm_flowi_sport(struct flowi *fl)
 769 {
 770         __be16 port;
 771         switch(fl->proto) {
 772         case IPPROTO_TCP:
 773         case IPPROTO_UDP:
 774         case IPPROTO_UDPLITE:
 775         case IPPROTO_SCTP:
 776                 port = fl->fl_ip_sport;
 777                 break;
 778         case IPPROTO_ICMP:
 779         case IPPROTO_ICMPV6:
 780                 port = htons(fl->fl_icmp_type);
 781                 break;
 782         case IPPROTO_MH:
 783                 port = htons(fl->fl_mh_type);
 784                 break;
 785         default:
 786                 port = 0;       /*XXX*/
 787         }
 788         return port;
 789 }
 790
 791 static __inline__
 792 __be16 xfrm_flowi_dport(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_dport;
 801                 break;
 802         case IPPROTO_ICMP:
 803         case IPPROTO_ICMPV6:
 804                 port = htons(fl->fl_icmp_code);
 805                 break;
 806         default:
 807                 port = 0;       /*XXX*/
 808         }
 809         return port;
 810 }
 811
 812 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
 813                                unsigned short family);
 814
 815 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 816 /*      If neither has a context --> match
 817  *      Otherwise, both must have a context and the sids, doi, alg must match
 818  */
 819 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 820 {
 821         return ((!s1 && !s2) ||
 822                 (s1 && s2 &&
 823                  (s1->ctx_sid == s2->ctx_sid) &&
 824                  (s1->ctx_doi == s2->ctx_doi) &&
 825                  (s1->ctx_alg == s2->ctx_alg)));
 826 }
 827 #else
 828 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 829 {
 830         return 1;
 831 }
 832 #endif
 833
 834 /* A struct encoding bundle of transformations to apply to some set of flow.
 835  *
 836  * dst->child points to the next element of bundle.
 837  * dst->xfrm  points to an instanse of transformer.
 838  *
 839  * Due to unfortunate limitations of current routing cache, which we
 840  * have no time to fix, it mirrors struct rtable and bound to the same
 841  * routing key, including saddr,daddr. However, we can have many of
 842  * bundles differing by session id. All the bundles grow from a parent
 843  * policy rule.
 844  */
 845 struct xfrm_dst
 846 {
 847         union {
 848                 struct dst_entry        dst;
 849                 struct rtable           rt;
 850                 struct rt6_info         rt6;
 851         } u;
 852         struct dst_entry *route;
 853 #ifdef CONFIG_XFRM_SUB_POLICY
 854         struct flowi *origin;
 855         struct xfrm_selector *partner;
 856 #endif
 857         u32 genid;
 858         u32 route_mtu_cached;
 859         u32 child_mtu_cached;
 860         u32 route_cookie;
 861         u32 path_cookie;
 862 };
 863
 864 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
 865 {
 866         dst_release(xdst->route);
 867         if (likely(xdst->u.dst.xfrm))
 868                 xfrm_state_put(xdst->u.dst.xfrm);
 869 #ifdef CONFIG_XFRM_SUB_POLICY
 870         kfree(xdst->origin);
 871         xdst->origin = NULL;
 872         kfree(xdst->partner);
 873         xdst->partner = NULL;
 874 #endif
 875 }
 876
 877 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
 878
 879 struct sec_path
 880 {
 881         atomic_t                refcnt;
 882         int                     len;
 883         struct xfrm_state       *xvec[XFRM_MAX_DEPTH];
 884 };
 885
 886 static inline struct sec_path *
 887 secpath_get(struct sec_path *sp)
 888 {
 889         if (sp)
 890                 atomic_inc(&sp->refcnt);
 891         return sp;
 892 }
 893
 894 extern void __secpath_destroy(struct sec_path *sp);
 895
 896 static inline void
 897 secpath_put(struct sec_path *sp)
 898 {
 899         if (sp && atomic_dec_and_test(&sp->refcnt))
 900                 __secpath_destroy(sp);
 901 }
 902
 903 extern struct sec_path *secpath_dup(struct sec_path *src);
 904
 905 static inline void
 906 secpath_reset(struct sk_buff *skb)
 907 {
 908 #ifdef CONFIG_XFRM
 909         secpath_put(skb->sp);
 910         skb->sp = NULL;
 911 #endif
 912 }
 913
 914 static inline int
 915 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
 916 {
 917         switch (family) {
 918         case AF_INET:
 919                 return addr->a4 == 0;
 920         case AF_INET6:
 921                 return ipv6_addr_any((struct in6_addr *)&addr->a6);
 922         }
 923         return 0;
 924 }
 925
 926 static inline int
 927 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 928 {
 929         return  (tmpl->saddr.a4 &&
 930                  tmpl->saddr.a4 != x->props.saddr.a4);
 931 }
 932
 933 static inline int
 934 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 935 {
 936         return  (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
 937                  ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
 938 }
 939
 940 static inline int
 941 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
 942 {
 943         switch (family) {
 944         case AF_INET:
 945                 return __xfrm4_state_addr_cmp(tmpl, x);
 946         case AF_INET6:
 947                 return __xfrm6_state_addr_cmp(tmpl, x);
 948         }
 949         return !0;
 950 }
 951
 952 #ifdef CONFIG_XFRM
 953 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
 954
 955 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
 956                                        struct sk_buff *skb,
 957                                        unsigned int family, int reverse)
 958 {
 959         int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
 960
 961         if (sk && sk->sk_policy[XFRM_POLICY_IN])
 962                 return __xfrm_policy_check(sk, ndir, skb, family);
 963
 964         return  (!xfrm_policy_count[dir] && !skb->sp) ||
 965                 (skb->dst->flags & DST_NOPOLICY) ||
 966                 __xfrm_policy_check(sk, ndir, skb, family);
 967 }
 968
 969 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
 970 {
 971         return __xfrm_policy_check2(sk, dir, skb, family, 0);
 972 }
 973
 974 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 975 {
 976         return xfrm_policy_check(sk, dir, skb, AF_INET);
 977 }
 978
 979 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 980 {
 981         return xfrm_policy_check(sk, dir, skb, AF_INET6);
 982 }
 983
 984 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
 985                                              struct sk_buff *skb)
 986 {
 987         return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
 988 }
 989
 990 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
 991                                              struct sk_buff *skb)
 992 {
 993         return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
 994 }
 995
 996 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
 997                                  unsigned int family, int reverse);
 998
 999 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1000                                       unsigned int family)
1001 {
1002         return __xfrm_decode_session(skb, fl, family, 0);
1003 }
1004
1005 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1006                                               struct flowi *fl,
1007                                               unsigned int family)
1008 {
1009         return __xfrm_decode_session(skb, fl, family, 1);
1010 }
1011
1012 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1013
1014 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1015 {
1016         return  !xfrm_policy_count[XFRM_POLICY_OUT] ||
1017                 (skb->dst->flags & DST_NOXFRM) ||
1018                 __xfrm_route_forward(skb, family);
1019 }
1020
1021 static inline int xfrm4_route_forward(struct sk_buff *skb)
1022 {
1023         return xfrm_route_forward(skb, AF_INET);
1024 }
1025
1026 static inline int xfrm6_route_forward(struct sk_buff *skb)
1027 {
1028         return xfrm_route_forward(skb, AF_INET6);
1029 }
1030
1031 extern int __xfrm_sk_clone_policy(struct sock *sk);
1032
1033 static inline int xfrm_sk_clone_policy(struct sock *sk)
1034 {
1035         if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1036                 return __xfrm_sk_clone_policy(sk);
1037         return 0;
1038 }
1039
1040 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1041
1042 static inline void xfrm_sk_free_policy(struct sock *sk)
1043 {
1044         if (unlikely(sk->sk_policy[0] != NULL)) {
1045                 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1046                 sk->sk_policy[0] = NULL;
1047         }
1048         if (unlikely(sk->sk_policy[1] != NULL)) {
1049                 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1050                 sk->sk_policy[1] = NULL;
1051         }
1052 }
1053
1054 #else
1055
1056 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1057 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1058 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1059 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1060 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1061 {
1062         return 1;
1063 }
1064 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1065 {
1066         return 1;
1067 }
1068 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1069 {
1070         return 1;
1071 }
1072 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1073                                               struct flowi *fl,
1074                                               unsigned int family)
1075 {
1076         return -ENOSYS;
1077 }
1078 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1079                                              struct sk_buff *skb)
1080 {
1081         return 1;
1082 }
1083 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1084                                              struct sk_buff *skb)
1085 {
1086         return 1;
1087 }
1088 #endif
1089
1090 static __inline__
1091 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1092 {
1093         switch (family){
1094         case AF_INET:
1095                 return (xfrm_address_t *)&fl->fl4_dst;
1096         case AF_INET6:
1097                 return (xfrm_address_t *)&fl->fl6_dst;
1098         }
1099         return NULL;
1100 }
1101
1102 static __inline__
1103 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1104 {
1105         switch (family){
1106         case AF_INET:
1107                 return (xfrm_address_t *)&fl->fl4_src;
1108         case AF_INET6:
1109                 return (xfrm_address_t *)&fl->fl6_src;
1110         }
1111         return NULL;
1112 }
1113
1114 static __inline__
1115 void xfrm_flowi_addr_get(struct flowi *fl,
1116                          xfrm_address_t *saddr, xfrm_address_t *daddr,
1117                          unsigned short family)
1118 {
1119         switch(family) {
1120         case AF_INET:
1121                 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1122                 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1123                 break;
1124         case AF_INET6:
1125                 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1126                 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1127                 break;
1128         }
1129 }
1130
1131 static __inline__ int
1132 __xfrm4_state_addr_check(struct xfrm_state *x,
1133                          xfrm_address_t *daddr, xfrm_address_t *saddr)
1134 {
1135         if (daddr->a4 == x->id.daddr.a4 &&
1136             (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1137                 return 1;
1138         return 0;
1139 }
1140
1141 static __inline__ int
1142 __xfrm6_state_addr_check(struct xfrm_state *x,
1143                          xfrm_address_t *daddr, xfrm_address_t *saddr)
1144 {
1145         if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1146             (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1147              ipv6_addr_any((struct in6_addr *)saddr) ||
1148              ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1149                 return 1;
1150         return 0;
1151 }
1152
1153 static __inline__ int
1154 xfrm_state_addr_check(struct xfrm_state *x,
1155                       xfrm_address_t *daddr, xfrm_address_t *saddr,
1156                       unsigned short family)
1157 {
1158         switch (family) {
1159         case AF_INET:
1160                 return __xfrm4_state_addr_check(x, daddr, saddr);
1161         case AF_INET6:
1162                 return __xfrm6_state_addr_check(x, daddr, saddr);
1163         }
1164         return 0;
1165 }
1166
1167 static __inline__ int
1168 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1169                            unsigned short family)
1170 {
1171         switch (family) {
1172         case AF_INET:
1173                 return __xfrm4_state_addr_check(x,
1174                                                 (xfrm_address_t *)&fl->fl4_dst,
1175                                                 (xfrm_address_t *)&fl->fl4_src);
1176         case AF_INET6:
1177                 return __xfrm6_state_addr_check(x,
1178                                                 (xfrm_address_t *)&fl->fl6_dst,
1179                                                 (xfrm_address_t *)&fl->fl6_src);
1180         }
1181         return 0;
1182 }
1183
1184 static inline int xfrm_state_kern(struct xfrm_state *x)
1185 {
1186         return atomic_read(&x->tunnel_users);
1187 }
1188
1189 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1190 {
1191         return (!userproto || proto == userproto ||
1192                 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1193                                                   proto == IPPROTO_ESP ||
1194                                                   proto == IPPROTO_COMP)));
1195 }
1196
1197 /*
1198  * xfrm algorithm information
1199  */
1200 struct xfrm_algo_aead_info {
1201         u16 icv_truncbits;
1202 };
1203
1204 struct xfrm_algo_auth_info {
1205         u16 icv_truncbits;
1206         u16 icv_fullbits;
1207 };
1208
1209 struct xfrm_algo_encr_info {
1210         u16 blockbits;
1211         u16 defkeybits;
1212 };
1213
1214 struct xfrm_algo_comp_info {
1215         u16 threshold;
1216 };
1217
1218 struct xfrm_algo_desc {
1219         char *name;
1220         char *compat;
1221         u8 available:1;
1222         union {
1223                 struct xfrm_algo_aead_info aead;
1224                 struct xfrm_algo_auth_info auth;
1225                 struct xfrm_algo_encr_info encr;
1226                 struct xfrm_algo_comp_info comp;
1227         } uinfo;
1228         struct sadb_alg desc;
1229 };
1230
1231 /* XFRM tunnel handlers.  */
1232 struct xfrm_tunnel {
1233         int (*handler)(struct sk_buff *skb);
1234         int (*err_handler)(struct sk_buff *skb, __u32 info);
1235
1236         struct xfrm_tunnel *next;
1237         int priority;
1238 };
1239
1240 struct xfrm6_tunnel {
1241         int (*handler)(struct sk_buff *skb);
1242         int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1243                            int type, int code, int offset, __be32 info);
1244         struct xfrm6_tunnel *next;
1245         int priority;
1246 };
1247
1248 struct xfrm_state_walk {
1249         struct list_head list;
1250         unsigned long genid;
1251         struct xfrm_state *state;
1252         int count;
1253         u8 proto;
1254 };
1255
1256 struct xfrm_policy_walk {
1257         struct xfrm_policy *policy;
1258         int count;
1259         u8 type, cur_type;
1260 };
1261
1262 extern void xfrm_init(void);
1263 extern void xfrm4_init(void);
1264 extern void xfrm_state_init(void);
1265 extern void xfrm4_state_init(void);
1266 #ifdef CONFIG_XFRM
1267 extern int xfrm6_init(void);
1268 extern void xfrm6_fini(void);
1269 extern int xfrm6_state_init(void);
1270 extern void xfrm6_state_fini(void);
1271 #else
1272 static inline int xfrm6_init(void)
1273 {
1274         return 0;
1275 }
1276 static inline void xfrm6_fini(void)
1277 {
1278         ;
1279 }
1280 #endif
1281
1282 #ifdef CONFIG_XFRM_STATISTICS
1283 extern int xfrm_proc_init(void);
1284 #endif
1285
1286 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1287 extern int xfrm_state_walk(struct xfrm_state_walk *walk,
1288                            int (*func)(struct xfrm_state *, int, void*), void *);
1289 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1290 extern struct xfrm_state *xfrm_state_alloc(void);
1291 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1292                                           struct flowi *fl, struct xfrm_tmpl *tmpl,
1293                                           struct xfrm_policy *pol, int *err,
1294                                           unsigned short family);
1295 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1296                                                xfrm_address_t *saddr,
1297                                                unsigned short family,
1298                                                u8 mode, u8 proto, u32 reqid);
1299 extern int xfrm_state_check_expire(struct xfrm_state *x);
1300 extern void xfrm_state_insert(struct xfrm_state *x);
1301 extern int xfrm_state_add(struct xfrm_state *x);
1302 extern int xfrm_state_update(struct xfrm_state *x);
1303 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1304 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1305 #ifdef CONFIG_XFRM_SUB_POLICY
1306 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1307                           int n, unsigned short family);
1308 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1309                            int n, unsigned short family);
1310 #else
1311 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1312                                  int n, unsigned short family)
1313 {
1314         return -ENOSYS;
1315 }
1316
1317 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1318                                   int n, unsigned short family)
1319 {
1320         return -ENOSYS;
1321 }
1322 #endif
1323
1324 struct xfrmk_sadinfo {
1325         u32 sadhcnt; /* current hash bkts */
1326         u32 sadhmcnt; /* max allowed hash bkts */
1327         u32 sadcnt; /* current running count */
1328 };
1329
1330 struct xfrmk_spdinfo {
1331         u32 incnt;
1332         u32 outcnt;
1333         u32 fwdcnt;
1334         u32 inscnt;
1335         u32 outscnt;
1336         u32 fwdscnt;
1337         u32 spdhcnt;
1338         u32 spdhmcnt;
1339 };
1340
1341 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1342 extern int xfrm_state_delete(struct xfrm_state *x);
1343 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1344 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1345 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1346 extern int xfrm_replay_check(struct xfrm_state *x,
1347                              struct sk_buff *skb, __be32 seq);
1348 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1349 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1350 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1351 extern int xfrm_init_state(struct xfrm_state *x);
1352 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1353 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1354                       int encap_type);
1355 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1356 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1357 extern int xfrm_output(struct sk_buff *skb);
1358 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1359 extern int xfrm4_extract_header(struct sk_buff *skb);
1360 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1361 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1362                            int encap_type);
1363 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1364 extern int xfrm4_rcv(struct sk_buff *skb);
1365
1366 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1367 {
1368         return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1369 }
1370
1371 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1372 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1373 extern int xfrm4_output(struct sk_buff *skb);
1374 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1375 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1376 extern int xfrm6_extract_header(struct sk_buff *skb);
1377 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1378 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1379 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1380 extern int xfrm6_rcv(struct sk_buff *skb);
1381 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1382                             xfrm_address_t *saddr, u8 proto);
1383 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1384 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1385 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1386 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1387 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1388 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1389 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1390 extern int xfrm6_output(struct sk_buff *skb);
1391 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1392                                  u8 **prevhdr);
1393
1394 #ifdef CONFIG_XFRM
1395 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1396 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1397 #else
1398 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1399 {
1400         return -ENOPROTOOPT;
1401 }
1402
1403 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1404 {
1405         /* should not happen */
1406         kfree_skb(skb);
1407         return 0;
1408 }
1409 #endif
1410
1411 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1412
1413 static inline void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
1414 {
1415         walk->cur_type = XFRM_POLICY_TYPE_MAIN;
1416         walk->type = type;
1417         walk->policy = NULL;
1418         walk->count = 0;
1419 }
1420
1421 static inline void xfrm_policy_walk_done(struct xfrm_policy_walk *walk)
1422 {
1423         if (walk->policy != NULL) {
1424                 xfrm_pol_put(walk->policy);
1425                 walk->policy = NULL;
1426         }
1427 }
1428
1429 extern int xfrm_policy_walk(struct xfrm_policy_walk *walk,
1430         int (*func)(struct xfrm_policy *, int, int, void*), void *);
1431 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1432 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1433                                           struct xfrm_selector *sel,
1434                                           struct xfrm_sec_ctx *ctx, int delete,
1435                                           int *err);
1436 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1437 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1438 u32 xfrm_get_acqseq(void);
1439 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1440 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1441                                   xfrm_address_t *daddr, xfrm_address_t *saddr,
1442                                   int create, unsigned short family);
1443 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1444 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1445                           struct flowi *fl, int family, int strict);
1446
1447 #ifdef CONFIG_XFRM_MIGRATE
1448 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1449                       struct xfrm_migrate *m, int num_bundles);
1450 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1451 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1452                                               struct xfrm_migrate *m);
1453 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1454                         struct xfrm_migrate *m, int num_bundles);
1455 #endif
1456
1457 extern wait_queue_head_t km_waitq;
1458 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1459 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1460 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1461
1462 extern void xfrm_input_init(void);
1463 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1464
1465 extern void xfrm_probe_algs(void);
1466 extern int xfrm_count_auth_supported(void);
1467 extern int xfrm_count_enc_supported(void);
1468 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1469 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1470 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1471 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1472 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1473 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1474 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1475 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1476 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1477                                                    int probe);
1478
1479 struct hash_desc;
1480 struct scatterlist;
1481 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1482                               unsigned int);
1483
1484 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1485                         int offset, int len, icv_update_fn_t icv_update);
1486
1487 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1488                                 int family)
1489 {
1490         switch (family) {
1491         default:
1492         case AF_INET:
1493                 return (__force __u32)a->a4 - (__force __u32)b->a4;
1494         case AF_INET6:
1495                 return ipv6_addr_cmp((struct in6_addr *)a,
1496                                      (struct in6_addr *)b);
1497         }
1498 }
1499
1500 static inline int xfrm_policy_id2dir(u32 index)
1501 {
1502         return index & 7;
1503 }
1504
1505 static inline int xfrm_aevent_is_on(void)
1506 {
1507         struct sock *nlsk;
1508         int ret = 0;
1509
1510         rcu_read_lock();
1511         nlsk = rcu_dereference(xfrm_nl);
1512         if (nlsk)
1513                 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1514         rcu_read_unlock();
1515         return ret;
1516 }
1517
1518 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1519 {
1520         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1521 }
1522
1523 #ifdef CONFIG_XFRM_MIGRATE
1524 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1525 {
1526         return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1527 }
1528
1529 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1530 {
1531         int i;
1532         for (i = 0; i < n; i++)
1533                 xfrm_state_put(*(states + i));
1534 }
1535
1536 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1537 {
1538         int i;
1539         for (i = 0; i < n; i++)
1540                 xfrm_state_delete(*(states + i));
1541 }
1542 #endif
1543
1544 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1545 {
1546         return skb->sp->xvec[skb->sp->len - 1];
1547 }
1548
1549 #endif  /* _NET_XFRM_H */