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/crypto.h>
  12 #include <linux/pfkeyv2.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
  24 extern struct sock *xfrm_nl;
  25 extern u32 sysctl_xfrm_aevent_etime;
  26 extern u32 sysctl_xfrm_aevent_rseqth;
  27
  28 extern struct mutex xfrm_cfg_mutex;
  29
  30 /* Organization of SPD aka "XFRM rules"
  31    ------------------------------------
  32
  33    Basic objects:
  34    - policy rule, struct xfrm_policy (=SPD entry)
  35    - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
  36    - instance of a transformer, struct xfrm_state (=SA)
  37    - template to clone xfrm_state, struct xfrm_tmpl
  38
  39    SPD is plain linear list of xfrm_policy rules, ordered by priority.
  40    (To be compatible with existing pfkeyv2 implementations,
  41    many rules with priority of 0x7fffffff are allowed to exist and
  42    such rules are ordered in an unpredictable way, thanks to bsd folks.)
  43
  44    Lookup is plain linear search until the first match with selector.
  45
  46    If "action" is "block", then we prohibit the flow, otherwise:
  47    if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
  48    policy entry has list of up to XFRM_MAX_DEPTH transformations,
  49    described by templates xfrm_tmpl. Each template is resolved
  50    to a complete xfrm_state (see below) and we pack bundle of transformations
  51    to a dst_entry returned to requestor.
  52
  53    dst -. xfrm  .-> xfrm_state #1
  54     |---. child .-> dst -. xfrm .-> xfrm_state #2
  55                      |---. child .-> dst -. xfrm .-> xfrm_state #3
  56                                       |---. child .-> NULL
  57
  58    Bundles are cached at xrfm_policy struct (field ->bundles).
  59
  60
  61    Resolution of xrfm_tmpl
  62    -----------------------
  63    Template contains:
  64    1. ->mode            Mode: transport or tunnel
  65    2. ->id.proto        Protocol: AH/ESP/IPCOMP
  66    3. ->id.daddr        Remote tunnel endpoint, ignored for transport mode.
  67       Q: allow to resolve security gateway?
  68    4. ->id.spi          If not zero, static SPI.
  69    5. ->saddr           Local tunnel endpoint, ignored for transport mode.
  70    6. ->algos           List of allowed algos. Plain bitmask now.
  71       Q: ealgos, aalgos, calgos. What a mess...
  72    7. ->share           Sharing mode.
  73       Q: how to implement private sharing mode? To add struct sock* to
  74       flow id?
  75
  76    Having this template we search through SAD searching for entries
  77    with appropriate mode/proto/algo, permitted by selector.
  78    If no appropriate entry found, it is requested from key manager.
  79
  80    PROBLEMS:
  81    Q: How to find all the bundles referring to a physical path for
  82       PMTU discovery? Seems, dst should contain list of all parents...
  83       and enter to infinite locking hierarchy disaster.
  84       No! It is easier, we will not search for them, let them find us.
  85       We add genid to each dst plus pointer to genid of raw IP route,
  86       pmtu disc will update pmtu on raw IP route and increase its genid.
  87       dst_check() will see this for top level and trigger resyncing
  88       metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
  89  */
  90
  91 /* Full description of state of transformer. */
  92 struct xfrm_state
  93 {
  94         /* Note: bydst is re-used during gc */
  95         struct list_head        bydst;
  96         struct list_head        byspi;
  97
  98         atomic_t                refcnt;
  99         spinlock_t              lock;
 100
 101         struct xfrm_id          id;
 102         struct xfrm_selector    sel;
 103
 104         /* Key manger bits */
 105         struct {
 106                 u8              state;
 107                 u8              dying;
 108                 u32             seq;
 109         } km;
 110
 111         /* Parameters of this state. */
 112         struct {
 113                 u32             reqid;
 114                 u8              mode;
 115                 u8              replay_window;
 116                 u8              aalgo, ealgo, calgo;
 117                 u8              flags;
 118                 u16             family;
 119                 xfrm_address_t  saddr;
 120                 int             header_len;
 121                 int             trailer_len;
 122         } props;
 123
 124         struct xfrm_lifetime_cfg lft;
 125
 126         /* Data for transformer */
 127         struct xfrm_algo        *aalg;
 128         struct xfrm_algo        *ealg;
 129         struct xfrm_algo        *calg;
 130
 131         /* Data for encapsulator */
 132         struct xfrm_encap_tmpl  *encap;
 133
 134         /* IPComp needs an IPIP tunnel for handling uncompressed packets */
 135         struct xfrm_state       *tunnel;
 136
 137         /* If a tunnel, number of users + 1 */
 138         atomic_t                tunnel_users;
 139
 140         /* State for replay detection */
 141         struct xfrm_replay_state replay;
 142
 143         /* Replay detection state at the time we sent the last notification */
 144         struct xfrm_replay_state preplay;
 145
 146         /* Replay detection notification settings */
 147         u32                     replay_maxage;
 148         u32                     replay_maxdiff;
 149
 150         /* Replay detection notification timer */
 151         struct timer_list       rtimer;
 152
 153         /* Statistics */
 154         struct xfrm_stats       stats;
 155
 156         struct xfrm_lifetime_cur curlft;
 157         struct timer_list       timer;
 158
 159         /* Reference to data common to all the instances of this
 160          * transformer. */
 161         struct xfrm_type        *type;
 162
 163         /* Security context */
 164         struct xfrm_sec_ctx     *security;
 165
 166         /* Private data of this transformer, format is opaque,
 167          * interpreted by xfrm_type methods. */
 168         void                    *data;
 169 };
 170
 171 enum {
 172         XFRM_STATE_VOID,
 173         XFRM_STATE_ACQ,
 174         XFRM_STATE_VALID,
 175         XFRM_STATE_ERROR,
 176         XFRM_STATE_EXPIRED,
 177         XFRM_STATE_DEAD
 178 };
 179
 180 /* callback structure passed from either netlink or pfkey */
 181 struct km_event
 182 {
 183         union {
 184                 u32 hard;
 185                 u32 proto;
 186                 u32 byid;
 187                 u32 aevent;
 188         } data;
 189
 190         u32     seq;
 191         u32     pid;
 192         u32     event;
 193 };
 194
 195 struct xfrm_type;
 196 struct xfrm_dst;
 197 struct xfrm_policy_afinfo {
 198         unsigned short          family;
 199         rwlock_t                lock;
 200         struct xfrm_type_map    *type_map;
 201         struct dst_ops          *dst_ops;
 202         void                    (*garbage_collect)(void);
 203         int                     (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
 204         struct dst_entry        *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
 205         int                     (*bundle_create)(struct xfrm_policy *policy,
 206                                                  struct xfrm_state **xfrm,
 207                                                  int nx,
 208                                                  struct flowi *fl,
 209                                                  struct dst_entry **dst_p);
 210         void                    (*decode_session)(struct sk_buff *skb,
 211                                                   struct flowi *fl);
 212 };
 213
 214 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
 215 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
 216 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
 217 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
 218 #define XFRM_ACQ_EXPIRES        30
 219
 220 struct xfrm_tmpl;
 221 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
 222 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
 223 extern int __xfrm_state_delete(struct xfrm_state *x);
 224
 225 struct xfrm_state_afinfo {
 226         unsigned short          family;
 227         rwlock_t                lock;
 228         struct list_head        *state_bydst;
 229         struct list_head        *state_byspi;
 230         int                     (*init_flags)(struct xfrm_state *x);
 231         void                    (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
 232                                                 struct xfrm_tmpl *tmpl,
 233                                                 xfrm_address_t *daddr, xfrm_address_t *saddr);
 234         struct xfrm_state       *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto);
 235         struct xfrm_state       *(*find_acq)(u8 mode, u32 reqid, u8 proto,
 236                                              xfrm_address_t *daddr, xfrm_address_t *saddr,
 237                                              int create);
 238 };
 239
 240 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
 241 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
 242
 243 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
 244
 245 struct xfrm_type
 246 {
 247         char                    *description;
 248         struct module           *owner;
 249         __u8                    proto;
 250
 251         int                     (*init_state)(struct xfrm_state *x);
 252         void                    (*destructor)(struct xfrm_state *);
 253         int                     (*input)(struct xfrm_state *, struct sk_buff *skb);
 254         int                     (*output)(struct xfrm_state *, struct sk_buff *pskb);
 255         /* Estimate maximal size of result of transformation of a dgram */
 256         u32                     (*get_max_size)(struct xfrm_state *, int size);
 257 };
 258
 259 struct xfrm_type_map {
 260         rwlock_t                lock;
 261         struct xfrm_type        *map[256];
 262 };
 263
 264 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
 265 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
 266 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
 267 extern void xfrm_put_type(struct xfrm_type *type);
 268
 269 struct xfrm_tmpl
 270 {
 271 /* id in template is interpreted as:
 272  * daddr - destination of tunnel, may be zero for transport mode.
 273  * spi   - zero to acquire spi. Not zero if spi is static, then
 274  *         daddr must be fixed too.
 275  * proto - AH/ESP/IPCOMP
 276  */
 277         struct xfrm_id          id;
 278
 279 /* Source address of tunnel. Ignored, if it is not a tunnel. */
 280         xfrm_address_t          saddr;
 281
 282         __u32                   reqid;
 283
 284 /* Mode: transport/tunnel */
 285         __u8                    mode;
 286
 287 /* Sharing mode: unique, this session only, this user only etc. */
 288         __u8                    share;
 289
 290 /* May skip this transfomration if no SA is found */
 291         __u8                    optional;
 292
 293 /* Bit mask of algos allowed for acquisition */
 294         __u32                   aalgos;
 295         __u32                   ealgos;
 296         __u32                   calgos;
 297 };
 298
 299 #define XFRM_MAX_DEPTH          4
 300
 301 struct xfrm_policy
 302 {
 303         struct xfrm_policy      *next;
 304         struct list_head        list;
 305
 306         /* This lock only affects elements except for entry. */
 307         rwlock_t                lock;
 308         atomic_t                refcnt;
 309         struct timer_list       timer;
 310
 311         u32                     priority;
 312         u32                     index;
 313         struct xfrm_selector    selector;
 314         struct xfrm_lifetime_cfg lft;
 315         struct xfrm_lifetime_cur curlft;
 316         struct dst_entry       *bundles;
 317         __u16                   family;
 318         __u8                    action;
 319         __u8                    flags;
 320         __u8                    dead;
 321         __u8                    xfrm_nr;
 322         struct xfrm_sec_ctx     *security;
 323         struct xfrm_tmpl        xfrm_vec[XFRM_MAX_DEPTH];
 324 };
 325
 326 #define XFRM_KM_TIMEOUT                30
 327 /* which seqno */
 328 #define XFRM_REPLAY_SEQ         1
 329 #define XFRM_REPLAY_OSEQ        2
 330 #define XFRM_REPLAY_SEQ_MASK    3
 331 /* what happened */
 332 #define XFRM_REPLAY_UPDATE      XFRM_AE_CR
 333 #define XFRM_REPLAY_TIMEOUT     XFRM_AE_CE
 334
 335 /* default aevent timeout in units of 100ms */
 336 #define XFRM_AE_ETIME                   10
 337 /* Async Event timer multiplier */
 338 #define XFRM_AE_ETH_M                   10
 339 /* default seq threshold size */
 340 #define XFRM_AE_SEQT_SIZE               2
 341
 342 struct xfrm_mgr
 343 {
 344         struct list_head        list;
 345         char                    *id;
 346         int                     (*notify)(struct xfrm_state *x, struct km_event *c);
 347         int                     (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
 348         struct xfrm_policy      *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir);
 349         int                     (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
 350         int                     (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
 351 };
 352
 353 extern int xfrm_register_km(struct xfrm_mgr *km);
 354 extern int xfrm_unregister_km(struct xfrm_mgr *km);
 355
 356
 357 extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
 358
 359 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
 360 {
 361         if (likely(policy != NULL))
 362                 atomic_inc(&policy->refcnt);
 363 }
 364
 365 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
 366
 367 static inline void xfrm_pol_put(struct xfrm_policy *policy)
 368 {
 369         if (atomic_dec_and_test(&policy->refcnt))
 370                 __xfrm_policy_destroy(policy);
 371 }
 372
 373 #define XFRM_DST_HSIZE          1024
 374
 375 static __inline__
 376 unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
 377 {
 378         unsigned h;
 379         h = ntohl(addr->a4);
 380         h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
 381         return h;
 382 }
 383
 384 static __inline__
 385 unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
 386 {
 387         unsigned h;
 388         h = ntohl(addr->a6[2]^addr->a6[3]);
 389         h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
 390         return h;
 391 }
 392
 393 static __inline__
 394 unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
 395 {
 396         switch (family) {
 397         case AF_INET:
 398                 return __xfrm4_dst_hash(addr);
 399         case AF_INET6:
 400                 return __xfrm6_dst_hash(addr);
 401         }
 402         return 0;
 403 }
 404
 405 static __inline__
 406 unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
 407 {
 408         unsigned h;
 409         h = ntohl(addr->a4^spi^proto);
 410         h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
 411         return h;
 412 }
 413
 414 static __inline__
 415 unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
 416 {
 417         unsigned h;
 418         h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
 419         h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
 420         return h;
 421 }
 422
 423 static __inline__
 424 unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
 425 {
 426         switch (family) {
 427         case AF_INET:
 428                 return __xfrm4_spi_hash(addr, spi, proto);
 429         case AF_INET6:
 430                 return __xfrm6_spi_hash(addr, spi, proto);
 431         }
 432         return 0;       /*XXX*/
 433 }
 434
 435 extern void __xfrm_state_destroy(struct xfrm_state *);
 436
 437 static inline void __xfrm_state_put(struct xfrm_state *x)
 438 {
 439         atomic_dec(&x->refcnt);
 440 }
 441
 442 static inline void xfrm_state_put(struct xfrm_state *x)
 443 {
 444         if (atomic_dec_and_test(&x->refcnt))
 445                 __xfrm_state_destroy(x);
 446 }
 447
 448 static inline void xfrm_state_hold(struct xfrm_state *x)
 449 {
 450         atomic_inc(&x->refcnt);
 451 }
 452
 453 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
 454 {
 455         __u32 *a1 = token1;
 456         __u32 *a2 = token2;
 457         int pdw;
 458         int pbi;
 459
 460         pdw = prefixlen >> 5;     /* num of whole __u32 in prefix */
 461         pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
 462
 463         if (pdw)
 464                 if (memcmp(a1, a2, pdw << 2))
 465                         return 0;
 466
 467         if (pbi) {
 468                 __u32 mask;
 469
 470                 mask = htonl((0xffffffff) << (32 - pbi));
 471
 472                 if ((a1[pdw] ^ a2[pdw]) & mask)
 473                         return 0;
 474         }
 475
 476         return 1;
 477 }
 478
 479 static __inline__
 480 u16 xfrm_flowi_sport(struct flowi *fl)
 481 {
 482         u16 port;
 483         switch(fl->proto) {
 484         case IPPROTO_TCP:
 485         case IPPROTO_UDP:
 486         case IPPROTO_SCTP:
 487                 port = fl->fl_ip_sport;
 488                 break;
 489         case IPPROTO_ICMP:
 490         case IPPROTO_ICMPV6:
 491                 port = htons(fl->fl_icmp_type);
 492                 break;
 493         default:
 494                 port = 0;       /*XXX*/
 495         }
 496         return port;
 497 }
 498
 499 static __inline__
 500 u16 xfrm_flowi_dport(struct flowi *fl)
 501 {
 502         u16 port;
 503         switch(fl->proto) {
 504         case IPPROTO_TCP:
 505         case IPPROTO_UDP:
 506         case IPPROTO_SCTP:
 507                 port = fl->fl_ip_dport;
 508                 break;
 509         case IPPROTO_ICMP:
 510         case IPPROTO_ICMPV6:
 511                 port = htons(fl->fl_icmp_code);
 512                 break;
 513         default:
 514                 port = 0;       /*XXX*/
 515         }
 516         return port;
 517 }
 518
 519 static inline int
 520 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
 521 {
 522         return  addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
 523                 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
 524                 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
 525                 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
 526                 (fl->proto == sel->proto || !sel->proto) &&
 527                 (fl->oif == sel->ifindex || !sel->ifindex);
 528 }
 529
 530 static inline int
 531 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
 532 {
 533         return  addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
 534                 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
 535                 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
 536                 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
 537                 (fl->proto == sel->proto || !sel->proto) &&
 538                 (fl->oif == sel->ifindex || !sel->ifindex);
 539 }
 540
 541 static inline int
 542 xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
 543                     unsigned short family)
 544 {
 545         switch (family) {
 546         case AF_INET:
 547                 return __xfrm4_selector_match(sel, fl);
 548         case AF_INET6:
 549                 return __xfrm6_selector_match(sel, fl);
 550         }
 551         return 0;
 552 }
 553
 554 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 555 /*      If neither has a context --> match
 556  *      Otherwise, both must have a context and the sids, doi, alg must match
 557  */
 558 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 559 {
 560         return ((!s1 && !s2) ||
 561                 (s1 && s2 &&
 562                  (s1->ctx_sid == s2->ctx_sid) &&
 563                  (s1->ctx_doi == s2->ctx_doi) &&
 564                  (s1->ctx_alg == s2->ctx_alg)));
 565 }
 566 #else
 567 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 568 {
 569         return 1;
 570 }
 571 #endif
 572
 573 /* A struct encoding bundle of transformations to apply to some set of flow.
 574  *
 575  * dst->child points to the next element of bundle.
 576  * dst->xfrm  points to an instanse of transformer.
 577  *
 578  * Due to unfortunate limitations of current routing cache, which we
 579  * have no time to fix, it mirrors struct rtable and bound to the same
 580  * routing key, including saddr,daddr. However, we can have many of
 581  * bundles differing by session id. All the bundles grow from a parent
 582  * policy rule.
 583  */
 584 struct xfrm_dst
 585 {
 586         union {
 587                 struct xfrm_dst         *next;
 588                 struct dst_entry        dst;
 589                 struct rtable           rt;
 590                 struct rt6_info         rt6;
 591         } u;
 592         struct dst_entry *route;
 593         u32 route_mtu_cached;
 594         u32 child_mtu_cached;
 595         u32 route_cookie;
 596         u32 path_cookie;
 597 };
 598
 599 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
 600 {
 601         dst_release(xdst->route);
 602         if (likely(xdst->u.dst.xfrm))
 603                 xfrm_state_put(xdst->u.dst.xfrm);
 604 }
 605
 606 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
 607
 608 struct sec_path
 609 {
 610         atomic_t                refcnt;
 611         int                     len;
 612         struct xfrm_state       *xvec[XFRM_MAX_DEPTH];
 613 };
 614
 615 static inline struct sec_path *
 616 secpath_get(struct sec_path *sp)
 617 {
 618         if (sp)
 619                 atomic_inc(&sp->refcnt);
 620         return sp;
 621 }
 622
 623 extern void __secpath_destroy(struct sec_path *sp);
 624
 625 static inline void
 626 secpath_put(struct sec_path *sp)
 627 {
 628         if (sp && atomic_dec_and_test(&sp->refcnt))
 629                 __secpath_destroy(sp);
 630 }
 631
 632 extern struct sec_path *secpath_dup(struct sec_path *src);
 633
 634 static inline void
 635 secpath_reset(struct sk_buff *skb)
 636 {
 637 #ifdef CONFIG_XFRM
 638         secpath_put(skb->sp);
 639         skb->sp = NULL;
 640 #endif
 641 }
 642
 643 static inline int
 644 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 645 {
 646         return  (tmpl->saddr.a4 &&
 647                  tmpl->saddr.a4 != x->props.saddr.a4);
 648 }
 649
 650 static inline int
 651 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 652 {
 653         return  (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
 654                  ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
 655 }
 656
 657 static inline int
 658 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
 659 {
 660         switch (family) {
 661         case AF_INET:
 662                 return __xfrm4_state_addr_cmp(tmpl, x);
 663         case AF_INET6:
 664                 return __xfrm6_state_addr_cmp(tmpl, x);
 665         }
 666         return !0;
 667 }
 668
 669 #ifdef CONFIG_XFRM
 670
 671 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
 672
 673 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
 674 {
 675         if (sk && sk->sk_policy[XFRM_POLICY_IN])
 676                 return __xfrm_policy_check(sk, dir, skb, family);
 677
 678         return  (!xfrm_policy_list[dir] && !skb->sp) ||
 679                 (skb->dst->flags & DST_NOPOLICY) ||
 680                 __xfrm_policy_check(sk, dir, skb, family);
 681 }
 682
 683 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 684 {
 685         return xfrm_policy_check(sk, dir, skb, AF_INET);
 686 }
 687
 688 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 689 {
 690         return xfrm_policy_check(sk, dir, skb, AF_INET6);
 691 }
 692
 693 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
 694 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
 695
 696 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
 697 {
 698         return  !xfrm_policy_list[XFRM_POLICY_OUT] ||
 699                 (skb->dst->flags & DST_NOXFRM) ||
 700                 __xfrm_route_forward(skb, family);
 701 }
 702
 703 static inline int xfrm4_route_forward(struct sk_buff *skb)
 704 {
 705         return xfrm_route_forward(skb, AF_INET);
 706 }
 707
 708 static inline int xfrm6_route_forward(struct sk_buff *skb)
 709 {
 710         return xfrm_route_forward(skb, AF_INET6);
 711 }
 712
 713 extern int __xfrm_sk_clone_policy(struct sock *sk);
 714
 715 static inline int xfrm_sk_clone_policy(struct sock *sk)
 716 {
 717         if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
 718                 return __xfrm_sk_clone_policy(sk);
 719         return 0;
 720 }
 721
 722 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
 723
 724 static inline void xfrm_sk_free_policy(struct sock *sk)
 725 {
 726         if (unlikely(sk->sk_policy[0] != NULL)) {
 727                 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
 728                 sk->sk_policy[0] = NULL;
 729         }
 730         if (unlikely(sk->sk_policy[1] != NULL)) {
 731                 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
 732                 sk->sk_policy[1] = NULL;
 733         }
 734 }
 735
 736 #else
 737
 738 static inline void xfrm_sk_free_policy(struct sock *sk) {}
 739 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
 740 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
 741 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
 742 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 743 {
 744         return 1;
 745 }
 746 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 747 {
 748         return 1;
 749 }
 750 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
 751 {
 752         return 1;
 753 }
 754 #endif
 755
 756 static __inline__
 757 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
 758 {
 759         switch (family){
 760         case AF_INET:
 761                 return (xfrm_address_t *)&fl->fl4_dst;
 762         case AF_INET6:
 763                 return (xfrm_address_t *)&fl->fl6_dst;
 764         }
 765         return NULL;
 766 }
 767
 768 static __inline__
 769 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
 770 {
 771         switch (family){
 772         case AF_INET:
 773                 return (xfrm_address_t *)&fl->fl4_src;
 774         case AF_INET6:
 775                 return (xfrm_address_t *)&fl->fl6_src;
 776         }
 777         return NULL;
 778 }
 779
 780 static __inline__ int
 781 __xfrm4_state_addr_check(struct xfrm_state *x,
 782                          xfrm_address_t *daddr, xfrm_address_t *saddr)
 783 {
 784         if (daddr->a4 == x->id.daddr.a4 &&
 785             (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
 786                 return 1;
 787         return 0;
 788 }
 789
 790 static __inline__ int
 791 __xfrm6_state_addr_check(struct xfrm_state *x,
 792                          xfrm_address_t *daddr, xfrm_address_t *saddr)
 793 {
 794         if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
 795             (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
 796              ipv6_addr_any((struct in6_addr *)saddr) ||
 797              ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
 798                 return 1;
 799         return 0;
 800 }
 801
 802 static __inline__ int
 803 xfrm_state_addr_check(struct xfrm_state *x,
 804                       xfrm_address_t *daddr, xfrm_address_t *saddr,
 805                       unsigned short family)
 806 {
 807         switch (family) {
 808         case AF_INET:
 809                 return __xfrm4_state_addr_check(x, daddr, saddr);
 810         case AF_INET6:
 811                 return __xfrm6_state_addr_check(x, daddr, saddr);
 812         }
 813         return 0;
 814 }
 815
 816 static inline int xfrm_state_kern(struct xfrm_state *x)
 817 {
 818         return atomic_read(&x->tunnel_users);
 819 }
 820
 821 /*
 822  * xfrm algorithm information
 823  */
 824 struct xfrm_algo_auth_info {
 825         u16 icv_truncbits;
 826         u16 icv_fullbits;
 827 };
 828
 829 struct xfrm_algo_encr_info {
 830         u16 blockbits;
 831         u16 defkeybits;
 832 };
 833
 834 struct xfrm_algo_comp_info {
 835         u16 threshold;
 836 };
 837
 838 struct xfrm_algo_desc {
 839         char *name;
 840         u8 available:1;
 841         union {
 842                 struct xfrm_algo_auth_info auth;
 843                 struct xfrm_algo_encr_info encr;
 844                 struct xfrm_algo_comp_info comp;
 845         } uinfo;
 846         struct sadb_alg desc;
 847 };
 848
 849 /* XFRM tunnel handlers.  */
 850 struct xfrm_tunnel {
 851         int (*handler)(struct sk_buff *skb);
 852         int (*err_handler)(struct sk_buff *skb, __u32 info);
 853
 854         struct xfrm_tunnel *next;
 855         int priority;
 856 };
 857
 858 struct xfrm6_tunnel {
 859         int (*handler)(struct sk_buff *skb);
 860         int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
 861                            int type, int code, int offset, __u32 info);
 862
 863         struct xfrm6_tunnel *next;
 864         int priority;
 865 };
 866
 867 extern void xfrm_init(void);
 868 extern void xfrm4_init(void);
 869 extern void xfrm6_init(void);
 870 extern void xfrm6_fini(void);
 871 extern void xfrm_state_init(void);
 872 extern void xfrm4_state_init(void);
 873 extern void xfrm6_state_init(void);
 874 extern void xfrm6_state_fini(void);
 875
 876 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
 877 extern struct xfrm_state *xfrm_state_alloc(void);
 878 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
 879                                           struct flowi *fl, struct xfrm_tmpl *tmpl,
 880                                           struct xfrm_policy *pol, int *err,
 881                                           unsigned short family);
 882 extern int xfrm_state_check_expire(struct xfrm_state *x);
 883 extern void xfrm_state_insert(struct xfrm_state *x);
 884 extern int xfrm_state_add(struct xfrm_state *x);
 885 extern int xfrm_state_update(struct xfrm_state *x);
 886 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
 887 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
 888 extern int xfrm_state_delete(struct xfrm_state *x);
 889 extern void xfrm_state_flush(u8 proto);
 890 extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
 891 extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
 892 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
 893 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
 894 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
 895 extern int xfrm_init_state(struct xfrm_state *x);
 896 extern int xfrm4_rcv(struct sk_buff *skb);
 897 extern int xfrm4_output(struct sk_buff *skb);
 898 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
 899 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
 900 extern int xfrm6_rcv_spi(struct sk_buff *skb, u32 spi);
 901 extern int xfrm6_rcv(struct sk_buff **pskb);
 902 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
 903 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
 904 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
 905 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
 906 extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
 907 extern int xfrm6_output(struct sk_buff *skb);
 908
 909 #ifdef CONFIG_XFRM
 910 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
 911 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
 912 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
 913 #else
 914 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
 915 {
 916         return -ENOPROTOOPT;
 917 }
 918
 919 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
 920 {
 921         /* should not happen */
 922         kfree_skb(skb);
 923         return 0;
 924 }
 925 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
 926 {
 927         return -EINVAL;
 928 }
 929 #endif
 930
 931 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
 932 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
 933 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
 934 struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel,
 935                                           struct xfrm_sec_ctx *ctx, int delete);
 936 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete);
 937 void xfrm_policy_flush(void);
 938 u32 xfrm_get_acqseq(void);
 939 void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
 940 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
 941                                   xfrm_address_t *daddr, xfrm_address_t *saddr,
 942                                   int create, unsigned short family);
 943 extern void xfrm_policy_flush(void);
 944 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
 945 extern int xfrm_flush_bundles(void);
 946 extern void xfrm_flush_all_bundles(void);
 947 extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family);
 948 extern void xfrm_init_pmtu(struct dst_entry *dst);
 949
 950 extern wait_queue_head_t km_waitq;
 951 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
 952 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
 953
 954 extern void xfrm_input_init(void);
 955 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq);
 956
 957 extern void xfrm_probe_algs(void);
 958 extern int xfrm_count_auth_supported(void);
 959 extern int xfrm_count_enc_supported(void);
 960 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
 961 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
 962 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
 963 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
 964 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
 965 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
 966 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
 967 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
 968
 969 struct crypto_tfm;
 970 typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int);
 971
 972 extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm,
 973                          int offset, int len, icv_update_fn_t icv_update);
 974
 975 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
 976                                 int family)
 977 {
 978         switch (family) {
 979         default:
 980         case AF_INET:
 981                 return a->a4 - b->a4;
 982         case AF_INET6:
 983                 return ipv6_addr_cmp((struct in6_addr *)a,
 984                                      (struct in6_addr *)b);
 985         }
 986 }
 987
 988 static inline int xfrm_policy_id2dir(u32 index)
 989 {
 990         return index & 7;
 991 }
 992
 993 static inline int xfrm_aevent_is_on(void)
 994 {
 995         struct sock *nlsk;
 996         int ret = 0;
 997
 998         rcu_read_lock();
 999         nlsk = rcu_dereference(xfrm_nl);
1000         if (nlsk)
1001                 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1002         rcu_read_unlock();
1003         return ret;
1004 }
1005
1006 static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
1007 {
1008         if (xfrm_aevent_is_on())
1009                 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1010 }
1011
1012
1013 #endif  /* _NET_XFRM_H */