include/net/xfrm.h

   1 #ifndef _NET_XFRM_H
   2 #define _NET_XFRM_H
   3
   4 #include <linux/compiler.h>
   5 #include <linux/in.h>
   6 #include <linux/xfrm.h>
   7 #include <linux/spinlock.h>
   8 #include <linux/list.h>
   9 #include <linux/skbuff.h>
  10 #include <linux/socket.h>
  11 #include <linux/pfkeyv2.h>
  12 #include <linux/ipsec.h>
  13 #include <linux/in6.h>
  14 #include <linux/mutex.h>
  15
  16 #include <net/sock.h>
  17 #include <net/dst.h>
  18 #include <net/route.h>
  19 #include <net/ipv6.h>
  20 #include <net/ip6_fib.h>
  21
  22 #define XFRM_ALIGN8(len)        (((len) + 7) & ~7)
  23 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
  24         MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
  25
  26 extern struct sock *xfrm_nl;
  27 extern u32 sysctl_xfrm_aevent_etime;
  28 extern u32 sysctl_xfrm_aevent_rseqth;
  29
  30 extern struct mutex xfrm_cfg_mutex;
  31
  32 /* Organization of SPD aka "XFRM rules"
  33    ------------------------------------
  34
  35    Basic objects:
  36    - policy rule, struct xfrm_policy (=SPD entry)
  37    - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
  38    - instance of a transformer, struct xfrm_state (=SA)
  39    - template to clone xfrm_state, struct xfrm_tmpl
  40
  41    SPD is plain linear list of xfrm_policy rules, ordered by priority.
  42    (To be compatible with existing pfkeyv2 implementations,
  43    many rules with priority of 0x7fffffff are allowed to exist and
  44    such rules are ordered in an unpredictable way, thanks to bsd folks.)
  45
  46    Lookup is plain linear search until the first match with selector.
  47
  48    If "action" is "block", then we prohibit the flow, otherwise:
  49    if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
  50    policy entry has list of up to XFRM_MAX_DEPTH transformations,
  51    described by templates xfrm_tmpl. Each template is resolved
  52    to a complete xfrm_state (see below) and we pack bundle of transformations
  53    to a dst_entry returned to requestor.
  54
  55    dst -. xfrm  .-> xfrm_state #1
  56     |---. child .-> dst -. xfrm .-> xfrm_state #2
  57                      |---. child .-> dst -. xfrm .-> xfrm_state #3
  58                                       |---. child .-> NULL
  59
  60    Bundles are cached at xrfm_policy struct (field ->bundles).
  61
  62
  63    Resolution of xrfm_tmpl
  64    -----------------------
  65    Template contains:
  66    1. ->mode            Mode: transport or tunnel
  67    2. ->id.proto        Protocol: AH/ESP/IPCOMP
  68    3. ->id.daddr        Remote tunnel endpoint, ignored for transport mode.
  69       Q: allow to resolve security gateway?
  70    4. ->id.spi          If not zero, static SPI.
  71    5. ->saddr           Local tunnel endpoint, ignored for transport mode.
  72    6. ->algos           List of allowed algos. Plain bitmask now.
  73       Q: ealgos, aalgos, calgos. What a mess...
  74    7. ->share           Sharing mode.
  75       Q: how to implement private sharing mode? To add struct sock* to
  76       flow id?
  77
  78    Having this template we search through SAD searching for entries
  79    with appropriate mode/proto/algo, permitted by selector.
  80    If no appropriate entry found, it is requested from key manager.
  81
  82    PROBLEMS:
  83    Q: How to find all the bundles referring to a physical path for
  84       PMTU discovery? Seems, dst should contain list of all parents...
  85       and enter to infinite locking hierarchy disaster.
  86       No! It is easier, we will not search for them, let them find us.
  87       We add genid to each dst plus pointer to genid of raw IP route,
  88       pmtu disc will update pmtu on raw IP route and increase its genid.
  89       dst_check() will see this for top level and trigger resyncing
  90       metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
  91  */
  92
  93 /* Full description of state of transformer. */
  94 struct xfrm_state
  95 {
  96         /* Note: bydst is re-used during gc */
  97         struct hlist_node       bydst;
  98         struct hlist_node       bysrc;
  99         struct hlist_node       byspi;
 100
 101         atomic_t                refcnt;
 102         spinlock_t              lock;
 103
 104         struct xfrm_id          id;
 105         struct xfrm_selector    sel;
 106
 107         u32                     genid;
 108
 109         /* Key manger bits */
 110         struct {
 111                 u8              state;
 112                 u8              dying;
 113                 u32             seq;
 114         } km;
 115
 116         /* Parameters of this state. */
 117         struct {
 118                 u32             reqid;
 119                 u8              mode;
 120                 u8              replay_window;
 121                 u8              aalgo, ealgo, calgo;
 122                 u8              flags;
 123                 u16             family;
 124                 xfrm_address_t  saddr;
 125                 int             header_len;
 126                 int             trailer_len;
 127         } props;
 128
 129         struct xfrm_lifetime_cfg lft;
 130
 131         /* Data for transformer */
 132         struct xfrm_algo        *aalg;
 133         struct xfrm_algo        *ealg;
 134         struct xfrm_algo        *calg;
 135
 136         /* Data for encapsulator */
 137         struct xfrm_encap_tmpl  *encap;
 138
 139         /* Data for care-of address */
 140         xfrm_address_t  *coaddr;
 141
 142         /* IPComp needs an IPIP tunnel for handling uncompressed packets */
 143         struct xfrm_state       *tunnel;
 144
 145         /* If a tunnel, number of users + 1 */
 146         atomic_t                tunnel_users;
 147
 148         /* State for replay detection */
 149         struct xfrm_replay_state replay;
 150
 151         /* Replay detection state at the time we sent the last notification */
 152         struct xfrm_replay_state preplay;
 153
 154         /* internal flag that only holds state for delayed aevent at the
 155          * moment
 156         */
 157         u32                     xflags;
 158
 159         /* Replay detection notification settings */
 160         u32                     replay_maxage;
 161         u32                     replay_maxdiff;
 162
 163         /* Replay detection notification timer */
 164         struct timer_list       rtimer;
 165
 166         /* Statistics */
 167         struct xfrm_stats       stats;
 168
 169         struct xfrm_lifetime_cur curlft;
 170         struct timer_list       timer;
 171
 172         /* Last used time */
 173         u64                     lastused;
 174
 175         /* Reference to data common to all the instances of this
 176          * transformer. */
 177         struct xfrm_type        *type;
 178         struct xfrm_mode        *mode;
 179
 180         /* Security context */
 181         struct xfrm_sec_ctx     *security;
 182
 183         /* Private data of this transformer, format is opaque,
 184          * interpreted by xfrm_type methods. */
 185         void                    *data;
 186 };
 187
 188 /* xflags - make enum if more show up */
 189 #define XFRM_TIME_DEFER 1
 190
 191 enum {
 192         XFRM_STATE_VOID,
 193         XFRM_STATE_ACQ,
 194         XFRM_STATE_VALID,
 195         XFRM_STATE_ERROR,
 196         XFRM_STATE_EXPIRED,
 197         XFRM_STATE_DEAD
 198 };
 199
 200 /* callback structure passed from either netlink or pfkey */
 201 struct km_event
 202 {
 203         union {
 204                 u32 hard;
 205                 u32 proto;
 206                 u32 byid;
 207                 u32 aevent;
 208                 u32 type;
 209         } data;
 210
 211         u32     seq;
 212         u32     pid;
 213         u32     event;
 214 };
 215
 216 struct xfrm_type;
 217 struct xfrm_dst;
 218 struct xfrm_policy_afinfo {
 219         unsigned short          family;
 220         struct xfrm_type        *type_map[IPPROTO_MAX];
 221         struct xfrm_mode        *mode_map[XFRM_MODE_MAX];
 222         struct dst_ops          *dst_ops;
 223         void                    (*garbage_collect)(void);
 224         int                     (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
 225         int                     (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
 226         struct dst_entry        *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
 227         int                     (*bundle_create)(struct xfrm_policy *policy,
 228                                                  struct xfrm_state **xfrm,
 229                                                  int nx,
 230                                                  struct flowi *fl,
 231                                                  struct dst_entry **dst_p);
 232         void                    (*decode_session)(struct sk_buff *skb,
 233                                                   struct flowi *fl);
 234 };
 235
 236 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
 237 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
 238 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
 239 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
 240 #define XFRM_ACQ_EXPIRES        30
 241
 242 struct xfrm_tmpl;
 243 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
 244 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
 245 extern int __xfrm_state_delete(struct xfrm_state *x);
 246
 247 struct xfrm_state_afinfo {
 248         unsigned short          family;
 249         int                     (*init_flags)(struct xfrm_state *x);
 250         void                    (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
 251                                                 struct xfrm_tmpl *tmpl,
 252                                                 xfrm_address_t *daddr, xfrm_address_t *saddr);
 253         int                     (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
 254         int                     (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
 255 };
 256
 257 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
 258 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
 259
 260 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
 261
 262 struct xfrm_type
 263 {
 264         char                    *description;
 265         struct module           *owner;
 266         __u8                    proto;
 267         __u8                    flags;
 268 #define XFRM_TYPE_NON_FRAGMENT  1
 269
 270         int                     (*init_state)(struct xfrm_state *x);
 271         void                    (*destructor)(struct xfrm_state *);
 272         int                     (*input)(struct xfrm_state *, struct sk_buff *skb);
 273         int                     (*output)(struct xfrm_state *, struct sk_buff *pskb);
 274         int                     (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
 275         int                     (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
 276         xfrm_address_t          *(*local_addr)(struct xfrm_state *, xfrm_address_t *);
 277         xfrm_address_t          *(*remote_addr)(struct xfrm_state *, xfrm_address_t *);
 278         /* Estimate maximal size of result of transformation of a dgram */
 279         u32                     (*get_max_size)(struct xfrm_state *, int size);
 280 };
 281
 282 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
 283 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
 284 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
 285 extern void xfrm_put_type(struct xfrm_type *type);
 286
 287 struct xfrm_mode {
 288         int (*input)(struct xfrm_state *x, struct sk_buff *skb);
 289         int (*output)(struct xfrm_state *x,struct sk_buff *skb);
 290
 291         struct module *owner;
 292         unsigned int encap;
 293 };
 294
 295 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
 296 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
 297 extern struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family);
 298 extern void xfrm_put_mode(struct xfrm_mode *mode);
 299
 300 struct xfrm_tmpl
 301 {
 302 /* id in template is interpreted as:
 303  * daddr - destination of tunnel, may be zero for transport mode.
 304  * spi   - zero to acquire spi. Not zero if spi is static, then
 305  *         daddr must be fixed too.
 306  * proto - AH/ESP/IPCOMP
 307  */
 308         struct xfrm_id          id;
 309
 310 /* Source address of tunnel. Ignored, if it is not a tunnel. */
 311         xfrm_address_t          saddr;
 312
 313         unsigned short          encap_family;
 314
 315         __u32                   reqid;
 316
 317 /* Mode: transport, tunnel etc. */
 318         __u8                    mode;
 319
 320 /* Sharing mode: unique, this session only, this user only etc. */
 321         __u8                    share;
 322
 323 /* May skip this transfomration if no SA is found */
 324         __u8                    optional;
 325
 326 /* Bit mask of algos allowed for acquisition */
 327         __u32                   aalgos;
 328         __u32                   ealgos;
 329         __u32                   calgos;
 330 };
 331
 332 #define XFRM_MAX_DEPTH          6
 333
 334 struct xfrm_policy
 335 {
 336         struct xfrm_policy      *next;
 337         struct hlist_node       bydst;
 338         struct hlist_node       byidx;
 339
 340         /* This lock only affects elements except for entry. */
 341         rwlock_t                lock;
 342         atomic_t                refcnt;
 343         struct timer_list       timer;
 344
 345         u32                     priority;
 346         u32                     index;
 347         struct xfrm_selector    selector;
 348         struct xfrm_lifetime_cfg lft;
 349         struct xfrm_lifetime_cur curlft;
 350         struct dst_entry       *bundles;
 351         u16                     family;
 352         u8                      type;
 353         u8                      action;
 354         u8                      flags;
 355         u8                      dead;
 356         u8                      xfrm_nr;
 357         /* XXX 1 byte hole, try to pack */
 358         struct xfrm_sec_ctx     *security;
 359         struct xfrm_tmpl        xfrm_vec[XFRM_MAX_DEPTH];
 360 };
 361
 362 #define XFRM_KM_TIMEOUT                30
 363 /* which seqno */
 364 #define XFRM_REPLAY_SEQ         1
 365 #define XFRM_REPLAY_OSEQ        2
 366 #define XFRM_REPLAY_SEQ_MASK    3
 367 /* what happened */
 368 #define XFRM_REPLAY_UPDATE      XFRM_AE_CR
 369 #define XFRM_REPLAY_TIMEOUT     XFRM_AE_CE
 370
 371 /* default aevent timeout in units of 100ms */
 372 #define XFRM_AE_ETIME                   10
 373 /* Async Event timer multiplier */
 374 #define XFRM_AE_ETH_M                   10
 375 /* default seq threshold size */
 376 #define XFRM_AE_SEQT_SIZE               2
 377
 378 struct xfrm_mgr
 379 {
 380         struct list_head        list;
 381         char                    *id;
 382         int                     (*notify)(struct xfrm_state *x, struct km_event *c);
 383         int                     (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
 384         struct xfrm_policy      *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
 385         int                     (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
 386         int                     (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
 387         int                     (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
 388 };
 389
 390 extern int xfrm_register_km(struct xfrm_mgr *km);
 391 extern int xfrm_unregister_km(struct xfrm_mgr *km);
 392
 393 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
 394
 395 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
 396 {
 397         if (likely(policy != NULL))
 398                 atomic_inc(&policy->refcnt);
 399 }
 400
 401 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
 402
 403 static inline void xfrm_pol_put(struct xfrm_policy *policy)
 404 {
 405         if (atomic_dec_and_test(&policy->refcnt))
 406                 __xfrm_policy_destroy(policy);
 407 }
 408
 409 #ifdef CONFIG_XFRM_SUB_POLICY
 410 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 411 {
 412         int i;
 413         for (i = npols - 1; i >= 0; --i)
 414                 xfrm_pol_put(pols[i]);
 415 }
 416 #else
 417 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 418 {
 419         xfrm_pol_put(pols[0]);
 420 }
 421 #endif
 422
 423 extern void __xfrm_state_destroy(struct xfrm_state *);
 424
 425 static inline void __xfrm_state_put(struct xfrm_state *x)
 426 {
 427         atomic_dec(&x->refcnt);
 428 }
 429
 430 static inline void xfrm_state_put(struct xfrm_state *x)
 431 {
 432         if (atomic_dec_and_test(&x->refcnt))
 433                 __xfrm_state_destroy(x);
 434 }
 435
 436 static inline void xfrm_state_hold(struct xfrm_state *x)
 437 {
 438         atomic_inc(&x->refcnt);
 439 }
 440
 441 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
 442 {
 443         __be32 *a1 = token1;
 444         __be32 *a2 = token2;
 445         int pdw;
 446         int pbi;
 447
 448         pdw = prefixlen >> 5;     /* num of whole __u32 in prefix */
 449         pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
 450
 451         if (pdw)
 452                 if (memcmp(a1, a2, pdw << 2))
 453                         return 0;
 454
 455         if (pbi) {
 456                 __be32 mask;
 457
 458                 mask = htonl((0xffffffff) << (32 - pbi));
 459
 460                 if ((a1[pdw] ^ a2[pdw]) & mask)
 461                         return 0;
 462         }
 463
 464         return 1;
 465 }
 466
 467 static __inline__
 468 __be16 xfrm_flowi_sport(struct flowi *fl)
 469 {
 470         __be16 port;
 471         switch(fl->proto) {
 472         case IPPROTO_TCP:
 473         case IPPROTO_UDP:
 474         case IPPROTO_UDPLITE:
 475         case IPPROTO_SCTP:
 476                 port = fl->fl_ip_sport;
 477                 break;
 478         case IPPROTO_ICMP:
 479         case IPPROTO_ICMPV6:
 480                 port = htons(fl->fl_icmp_type);
 481                 break;
 482 #ifdef CONFIG_IPV6_MIP6
 483         case IPPROTO_MH:
 484                 port = htons(fl->fl_mh_type);
 485                 break;
 486 #endif
 487         default:
 488                 port = 0;       /*XXX*/
 489         }
 490         return port;
 491 }
 492
 493 static __inline__
 494 __be16 xfrm_flowi_dport(struct flowi *fl)
 495 {
 496         __be16 port;
 497         switch(fl->proto) {
 498         case IPPROTO_TCP:
 499         case IPPROTO_UDP:
 500         case IPPROTO_UDPLITE:
 501         case IPPROTO_SCTP:
 502                 port = fl->fl_ip_dport;
 503                 break;
 504         case IPPROTO_ICMP:
 505         case IPPROTO_ICMPV6:
 506                 port = htons(fl->fl_icmp_code);
 507                 break;
 508         default:
 509                 port = 0;       /*XXX*/
 510         }
 511         return port;
 512 }
 513
 514 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
 515                                unsigned short family);
 516
 517 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 518 /*      If neither has a context --> match
 519  *      Otherwise, both must have a context and the sids, doi, alg must match
 520  */
 521 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 522 {
 523         return ((!s1 && !s2) ||
 524                 (s1 && s2 &&
 525                  (s1->ctx_sid == s2->ctx_sid) &&
 526                  (s1->ctx_doi == s2->ctx_doi) &&
 527                  (s1->ctx_alg == s2->ctx_alg)));
 528 }
 529 #else
 530 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 531 {
 532         return 1;
 533 }
 534 #endif
 535
 536 /* A struct encoding bundle of transformations to apply to some set of flow.
 537  *
 538  * dst->child points to the next element of bundle.
 539  * dst->xfrm  points to an instanse of transformer.
 540  *
 541  * Due to unfortunate limitations of current routing cache, which we
 542  * have no time to fix, it mirrors struct rtable and bound to the same
 543  * routing key, including saddr,daddr. However, we can have many of
 544  * bundles differing by session id. All the bundles grow from a parent
 545  * policy rule.
 546  */
 547 struct xfrm_dst
 548 {
 549         union {
 550                 struct xfrm_dst         *next;
 551                 struct dst_entry        dst;
 552                 struct rtable           rt;
 553                 struct rt6_info         rt6;
 554         } u;
 555         struct dst_entry *route;
 556         u32 genid;
 557         u32 route_mtu_cached;
 558         u32 child_mtu_cached;
 559         u32 route_cookie;
 560         u32 path_cookie;
 561 };
 562
 563 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
 564 {
 565         dst_release(xdst->route);
 566         if (likely(xdst->u.dst.xfrm))
 567                 xfrm_state_put(xdst->u.dst.xfrm);
 568 }
 569
 570 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
 571
 572 struct sec_path
 573 {
 574         atomic_t                refcnt;
 575         int                     len;
 576         struct xfrm_state       *xvec[XFRM_MAX_DEPTH];
 577 };
 578
 579 static inline struct sec_path *
 580 secpath_get(struct sec_path *sp)
 581 {
 582         if (sp)
 583                 atomic_inc(&sp->refcnt);
 584         return sp;
 585 }
 586
 587 extern void __secpath_destroy(struct sec_path *sp);
 588
 589 static inline void
 590 secpath_put(struct sec_path *sp)
 591 {
 592         if (sp && atomic_dec_and_test(&sp->refcnt))
 593                 __secpath_destroy(sp);
 594 }
 595
 596 extern struct sec_path *secpath_dup(struct sec_path *src);
 597
 598 static inline void
 599 secpath_reset(struct sk_buff *skb)
 600 {
 601 #ifdef CONFIG_XFRM
 602         secpath_put(skb->sp);
 603         skb->sp = NULL;
 604 #endif
 605 }
 606
 607 static inline int
 608 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
 609 {
 610         switch (family) {
 611         case AF_INET:
 612                 return addr->a4 == 0;
 613         case AF_INET6:
 614                 return ipv6_addr_any((struct in6_addr *)&addr->a6);
 615         }
 616         return 0;
 617 }
 618
 619 static inline int
 620 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 621 {
 622         return  (tmpl->saddr.a4 &&
 623                  tmpl->saddr.a4 != x->props.saddr.a4);
 624 }
 625
 626 static inline int
 627 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 628 {
 629         return  (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
 630                  ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
 631 }
 632
 633 static inline int
 634 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
 635 {
 636         switch (family) {
 637         case AF_INET:
 638                 return __xfrm4_state_addr_cmp(tmpl, x);
 639         case AF_INET6:
 640                 return __xfrm6_state_addr_cmp(tmpl, x);
 641         }
 642         return !0;
 643 }
 644
 645 #ifdef CONFIG_XFRM
 646
 647 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
 648
 649 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
 650 {
 651         if (sk && sk->sk_policy[XFRM_POLICY_IN])
 652                 return __xfrm_policy_check(sk, dir, skb, family);
 653
 654         return  (!xfrm_policy_count[dir] && !skb->sp) ||
 655                 (skb->dst->flags & DST_NOPOLICY) ||
 656                 __xfrm_policy_check(sk, dir, skb, family);
 657 }
 658
 659 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 660 {
 661         return xfrm_policy_check(sk, dir, skb, AF_INET);
 662 }
 663
 664 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 665 {
 666         return xfrm_policy_check(sk, dir, skb, AF_INET6);
 667 }
 668
 669 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
 670 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
 671
 672 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
 673 {
 674         return  !xfrm_policy_count[XFRM_POLICY_OUT] ||
 675                 (skb->dst->flags & DST_NOXFRM) ||
 676                 __xfrm_route_forward(skb, family);
 677 }
 678
 679 static inline int xfrm4_route_forward(struct sk_buff *skb)
 680 {
 681         return xfrm_route_forward(skb, AF_INET);
 682 }
 683
 684 static inline int xfrm6_route_forward(struct sk_buff *skb)
 685 {
 686         return xfrm_route_forward(skb, AF_INET6);
 687 }
 688
 689 extern int __xfrm_sk_clone_policy(struct sock *sk);
 690
 691 static inline int xfrm_sk_clone_policy(struct sock *sk)
 692 {
 693         if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
 694                 return __xfrm_sk_clone_policy(sk);
 695         return 0;
 696 }
 697
 698 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
 699
 700 static inline void xfrm_sk_free_policy(struct sock *sk)
 701 {
 702         if (unlikely(sk->sk_policy[0] != NULL)) {
 703                 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
 704                 sk->sk_policy[0] = NULL;
 705         }
 706         if (unlikely(sk->sk_policy[1] != NULL)) {
 707                 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
 708                 sk->sk_policy[1] = NULL;
 709         }
 710 }
 711
 712 #else
 713
 714 static inline void xfrm_sk_free_policy(struct sock *sk) {}
 715 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
 716 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
 717 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
 718 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 719 {
 720         return 1;
 721 }
 722 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 723 {
 724         return 1;
 725 }
 726 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
 727 {
 728         return 1;
 729 }
 730 #endif
 731
 732 static __inline__
 733 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
 734 {
 735         switch (family){
 736         case AF_INET:
 737                 return (xfrm_address_t *)&fl->fl4_dst;
 738         case AF_INET6:
 739                 return (xfrm_address_t *)&fl->fl6_dst;
 740         }
 741         return NULL;
 742 }
 743
 744 static __inline__
 745 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
 746 {
 747         switch (family){
 748         case AF_INET:
 749                 return (xfrm_address_t *)&fl->fl4_src;
 750         case AF_INET6:
 751                 return (xfrm_address_t *)&fl->fl6_src;
 752         }
 753         return NULL;
 754 }
 755
 756 static __inline__ int
 757 __xfrm4_state_addr_check(struct xfrm_state *x,
 758                          xfrm_address_t *daddr, xfrm_address_t *saddr)
 759 {
 760         if (daddr->a4 == x->id.daddr.a4 &&
 761             (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
 762                 return 1;
 763         return 0;
 764 }
 765
 766 static __inline__ int
 767 __xfrm6_state_addr_check(struct xfrm_state *x,
 768                          xfrm_address_t *daddr, xfrm_address_t *saddr)
 769 {
 770         if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
 771             (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
 772              ipv6_addr_any((struct in6_addr *)saddr) ||
 773              ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
 774                 return 1;
 775         return 0;
 776 }
 777
 778 static __inline__ int
 779 xfrm_state_addr_check(struct xfrm_state *x,
 780                       xfrm_address_t *daddr, xfrm_address_t *saddr,
 781                       unsigned short family)
 782 {
 783         switch (family) {
 784         case AF_INET:
 785                 return __xfrm4_state_addr_check(x, daddr, saddr);
 786         case AF_INET6:
 787                 return __xfrm6_state_addr_check(x, daddr, saddr);
 788         }
 789         return 0;
 790 }
 791
 792 static __inline__ int
 793 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
 794                            unsigned short family)
 795 {
 796         switch (family) {
 797         case AF_INET:
 798                 return __xfrm4_state_addr_check(x,
 799                                                 (xfrm_address_t *)&fl->fl4_dst,
 800                                                 (xfrm_address_t *)&fl->fl4_src);
 801         case AF_INET6:
 802                 return __xfrm6_state_addr_check(x,
 803                                                 (xfrm_address_t *)&fl->fl6_dst,
 804                                                 (xfrm_address_t *)&fl->fl6_src);
 805         }
 806         return 0;
 807 }
 808
 809 static inline int xfrm_state_kern(struct xfrm_state *x)
 810 {
 811         return atomic_read(&x->tunnel_users);
 812 }
 813
 814 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
 815 {
 816         return (!userproto || proto == userproto ||
 817                 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
 818                                                   proto == IPPROTO_ESP ||
 819                                                   proto == IPPROTO_COMP)));
 820 }
 821
 822 /*
 823  * xfrm algorithm information
 824  */
 825 struct xfrm_algo_auth_info {
 826         u16 icv_truncbits;
 827         u16 icv_fullbits;
 828 };
 829
 830 struct xfrm_algo_encr_info {
 831         u16 blockbits;
 832         u16 defkeybits;
 833 };
 834
 835 struct xfrm_algo_comp_info {
 836         u16 threshold;
 837 };
 838
 839 struct xfrm_algo_desc {
 840         char *name;
 841         char *compat;
 842         u8 available:1;
 843         union {
 844                 struct xfrm_algo_auth_info auth;
 845                 struct xfrm_algo_encr_info encr;
 846                 struct xfrm_algo_comp_info comp;
 847         } uinfo;
 848         struct sadb_alg desc;
 849 };
 850
 851 /* XFRM tunnel handlers.  */
 852 struct xfrm_tunnel {
 853         int (*handler)(struct sk_buff *skb);
 854         int (*err_handler)(struct sk_buff *skb, __u32 info);
 855
 856         struct xfrm_tunnel *next;
 857         int priority;
 858 };
 859
 860 struct xfrm6_tunnel {
 861         int (*handler)(struct sk_buff *skb);
 862         int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
 863                            int type, int code, int offset, __be32 info);
 864         struct xfrm6_tunnel *next;
 865         int priority;
 866 };
 867
 868 extern void xfrm_init(void);
 869 extern void xfrm4_init(void);
 870 extern void xfrm6_init(void);
 871 extern void xfrm6_fini(void);
 872 extern void xfrm_state_init(void);
 873 extern void xfrm4_state_init(void);
 874 extern void xfrm6_state_init(void);
 875 extern void xfrm6_state_fini(void);
 876
 877 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
 878 extern struct xfrm_state *xfrm_state_alloc(void);
 879 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
 880                                           struct flowi *fl, struct xfrm_tmpl *tmpl,
 881                                           struct xfrm_policy *pol, int *err,
 882                                           unsigned short family);
 883 extern int xfrm_state_check_expire(struct xfrm_state *x);
 884 extern void xfrm_state_insert(struct xfrm_state *x);
 885 extern int xfrm_state_add(struct xfrm_state *x);
 886 extern int xfrm_state_update(struct xfrm_state *x);
 887 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
 888 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
 889 #ifdef CONFIG_XFRM_SUB_POLICY
 890 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
 891                           int n, unsigned short family);
 892 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
 893                            int n, unsigned short family);
 894 #else
 895 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
 896                                  int n, unsigned short family)
 897 {
 898         return -ENOSYS;
 899 }
 900
 901 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
 902                                   int n, unsigned short family)
 903 {
 904         return -ENOSYS;
 905 }
 906 #endif
 907 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
 908 extern int xfrm_state_delete(struct xfrm_state *x);
 909 extern void xfrm_state_flush(u8 proto);
 910 extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
 911 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
 912 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
 913 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
 914 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
 915 extern int xfrm_init_state(struct xfrm_state *x);
 916 extern int xfrm4_rcv(struct sk_buff *skb);
 917 extern int xfrm4_output(struct sk_buff *skb);
 918 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
 919 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
 920 extern int xfrm6_rcv_spi(struct sk_buff *skb, __be32 spi);
 921 extern int xfrm6_rcv(struct sk_buff **pskb);
 922 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
 923                             xfrm_address_t *saddr, u8 proto);
 924 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
 925 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
 926 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
 927 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
 928 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
 929 extern int xfrm6_output(struct sk_buff *skb);
 930 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
 931                                  u8 **prevhdr);
 932
 933 #ifdef CONFIG_XFRM
 934 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
 935 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
 936 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
 937 #else
 938 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
 939 {
 940         return -ENOPROTOOPT;
 941 }
 942
 943 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
 944 {
 945         /* should not happen */
 946         kfree_skb(skb);
 947         return 0;
 948 }
 949 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
 950 {
 951         return -EINVAL;
 952 }
 953 #endif
 954
 955 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
 956 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *);
 957 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
 958 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
 959                                           struct xfrm_selector *sel,
 960                                           struct xfrm_sec_ctx *ctx, int delete);
 961 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete);
 962 void xfrm_policy_flush(u8 type);
 963 u32 xfrm_get_acqseq(void);
 964 void xfrm_alloc_spi(struct xfrm_state *x, __be32 minspi, __be32 maxspi);
 965 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
 966                                   xfrm_address_t *daddr, xfrm_address_t *saddr,
 967                                   int create, unsigned short family);
 968 extern void xfrm_policy_flush(u8 type);
 969 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
 970 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
 971                           struct flowi *fl, int family, int strict);
 972 extern void xfrm_init_pmtu(struct dst_entry *dst);
 973
 974 extern wait_queue_head_t km_waitq;
 975 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
 976 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
 977 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
 978
 979 extern void xfrm_input_init(void);
 980 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
 981
 982 extern void xfrm_probe_algs(void);
 983 extern int xfrm_count_auth_supported(void);
 984 extern int xfrm_count_enc_supported(void);
 985 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
 986 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
 987 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
 988 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
 989 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
 990 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
 991 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
 992 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
 993
 994 struct hash_desc;
 995 struct scatterlist;
 996 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
 997                               unsigned int);
 998
 999 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1000                         int offset, int len, icv_update_fn_t icv_update);
1001
1002 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1003                                 int family)
1004 {
1005         switch (family) {
1006         default:
1007         case AF_INET:
1008                 return (__force __u32)a->a4 - (__force __u32)b->a4;
1009         case AF_INET6:
1010                 return ipv6_addr_cmp((struct in6_addr *)a,
1011                                      (struct in6_addr *)b);
1012         }
1013 }
1014
1015 static inline int xfrm_policy_id2dir(u32 index)
1016 {
1017         return index & 7;
1018 }
1019
1020 static inline int xfrm_aevent_is_on(void)
1021 {
1022         struct sock *nlsk;
1023         int ret = 0;
1024
1025         rcu_read_lock();
1026         nlsk = rcu_dereference(xfrm_nl);
1027         if (nlsk)
1028                 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1029         rcu_read_unlock();
1030         return ret;
1031 }
1032
1033 static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
1034 {
1035         if (xfrm_aevent_is_on())
1036                 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1037 }
1038
1039
1040 #endif  /* _NET_XFRM_H */