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_decap_state;
 246 struct xfrm_type
 247 {
 248         char                    *description;
 249         struct module           *owner;
 250         __u8                    proto;
 251
 252         int                     (*init_state)(struct xfrm_state *x);
 253         void                    (*destructor)(struct xfrm_state *);
 254         int                     (*input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
 255         int                     (*output)(struct xfrm_state *, struct sk_buff *pskb);
 256         /* Estimate maximal size of result of transformation of a dgram */
 257         u32                     (*get_max_size)(struct xfrm_state *, int size);
 258 };
 259
 260 struct xfrm_type_map {
 261         rwlock_t                lock;
 262         struct xfrm_type        *map[256];
 263 };
 264
 265 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
 266 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
 267 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
 268 extern void xfrm_put_type(struct xfrm_type *type);
 269
 270 struct xfrm_tmpl
 271 {
 272 /* id in template is interpreted as:
 273  * daddr - destination of tunnel, may be zero for transport mode.
 274  * spi   - zero to acquire spi. Not zero if spi is static, then
 275  *         daddr must be fixed too.
 276  * proto - AH/ESP/IPCOMP
 277  */
 278         struct xfrm_id          id;
 279
 280 /* Source address of tunnel. Ignored, if it is not a tunnel. */
 281         xfrm_address_t          saddr;
 282
 283         __u32                   reqid;
 284
 285 /* Mode: transport/tunnel */
 286         __u8                    mode;
 287
 288 /* Sharing mode: unique, this session only, this user only etc. */
 289         __u8                    share;
 290
 291 /* May skip this transfomration if no SA is found */
 292         __u8                    optional;
 293
 294 /* Bit mask of algos allowed for acquisition */
 295         __u32                   aalgos;
 296         __u32                   ealgos;
 297         __u32                   calgos;
 298 };
 299
 300 #define XFRM_MAX_DEPTH          4
 301
 302 struct xfrm_policy
 303 {
 304         struct xfrm_policy      *next;
 305         struct list_head        list;
 306
 307         /* This lock only affects elements except for entry. */
 308         rwlock_t                lock;
 309         atomic_t                refcnt;
 310         struct timer_list       timer;
 311
 312         u32                     priority;
 313         u32                     index;
 314         struct xfrm_selector    selector;
 315         struct xfrm_lifetime_cfg lft;
 316         struct xfrm_lifetime_cur curlft;
 317         struct dst_entry       *bundles;
 318         __u16                   family;
 319         __u8                    action;
 320         __u8                    flags;
 321         __u8                    dead;
 322         __u8                    xfrm_nr;
 323         struct xfrm_sec_ctx     *security;
 324         struct xfrm_tmpl        xfrm_vec[XFRM_MAX_DEPTH];
 325 };
 326
 327 #define XFRM_KM_TIMEOUT                30
 328 /* which seqno */
 329 #define XFRM_REPLAY_SEQ         1
 330 #define XFRM_REPLAY_OSEQ        2
 331 #define XFRM_REPLAY_SEQ_MASK    3
 332 /* what happened */
 333 #define XFRM_REPLAY_UPDATE      XFRM_AE_CR
 334 #define XFRM_REPLAY_TIMEOUT     XFRM_AE_CE
 335
 336 /* default aevent timeout in units of 100ms */
 337 #define XFRM_AE_ETIME                   10
 338 /* Async Event timer multiplier */
 339 #define XFRM_AE_ETH_M                   10
 340 /* default seq threshold size */
 341 #define XFRM_AE_SEQT_SIZE               2
 342
 343 struct xfrm_mgr
 344 {
 345         struct list_head        list;
 346         char                    *id;
 347         int                     (*notify)(struct xfrm_state *x, struct km_event *c);
 348         int                     (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
 349         struct xfrm_policy      *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir);
 350         int                     (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
 351         int                     (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
 352 };
 353
 354 extern int xfrm_register_km(struct xfrm_mgr *km);
 355 extern int xfrm_unregister_km(struct xfrm_mgr *km);
 356
 357
 358 extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
 359
 360 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
 361 {
 362         if (likely(policy != NULL))
 363                 atomic_inc(&policy->refcnt);
 364 }
 365
 366 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
 367
 368 static inline void xfrm_pol_put(struct xfrm_policy *policy)
 369 {
 370         if (atomic_dec_and_test(&policy->refcnt))
 371                 __xfrm_policy_destroy(policy);
 372 }
 373
 374 #define XFRM_DST_HSIZE          1024
 375
 376 static __inline__
 377 unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
 378 {
 379         unsigned h;
 380         h = ntohl(addr->a4);
 381         h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
 382         return h;
 383 }
 384
 385 static __inline__
 386 unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
 387 {
 388         unsigned h;
 389         h = ntohl(addr->a6[2]^addr->a6[3]);
 390         h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
 391         return h;
 392 }
 393
 394 static __inline__
 395 unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
 396 {
 397         switch (family) {
 398         case AF_INET:
 399                 return __xfrm4_dst_hash(addr);
 400         case AF_INET6:
 401                 return __xfrm6_dst_hash(addr);
 402         }
 403         return 0;
 404 }
 405
 406 static __inline__
 407 unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
 408 {
 409         unsigned h;
 410         h = ntohl(addr->a4^spi^proto);
 411         h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
 412         return h;
 413 }
 414
 415 static __inline__
 416 unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
 417 {
 418         unsigned h;
 419         h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
 420         h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
 421         return h;
 422 }
 423
 424 static __inline__
 425 unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
 426 {
 427         switch (family) {
 428         case AF_INET:
 429                 return __xfrm4_spi_hash(addr, spi, proto);
 430         case AF_INET6:
 431                 return __xfrm6_spi_hash(addr, spi, proto);
 432         }
 433         return 0;       /*XXX*/
 434 }
 435
 436 extern void __xfrm_state_destroy(struct xfrm_state *);
 437
 438 static inline void __xfrm_state_put(struct xfrm_state *x)
 439 {
 440         atomic_dec(&x->refcnt);
 441 }
 442
 443 static inline void xfrm_state_put(struct xfrm_state *x)
 444 {
 445         if (atomic_dec_and_test(&x->refcnt))
 446                 __xfrm_state_destroy(x);
 447 }
 448
 449 static inline void xfrm_state_hold(struct xfrm_state *x)
 450 {
 451         atomic_inc(&x->refcnt);
 452 }
 453
 454 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
 455 {
 456         __u32 *a1 = token1;
 457         __u32 *a2 = token2;
 458         int pdw;
 459         int pbi;
 460
 461         pdw = prefixlen >> 5;     /* num of whole __u32 in prefix */
 462         pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
 463
 464         if (pdw)
 465                 if (memcmp(a1, a2, pdw << 2))
 466                         return 0;
 467
 468         if (pbi) {
 469                 __u32 mask;
 470
 471                 mask = htonl((0xffffffff) << (32 - pbi));
 472
 473                 if ((a1[pdw] ^ a2[pdw]) & mask)
 474                         return 0;
 475         }
 476
 477         return 1;
 478 }
 479
 480 static __inline__
 481 u16 xfrm_flowi_sport(struct flowi *fl)
 482 {
 483         u16 port;
 484         switch(fl->proto) {
 485         case IPPROTO_TCP:
 486         case IPPROTO_UDP:
 487         case IPPROTO_SCTP:
 488                 port = fl->fl_ip_sport;
 489                 break;
 490         case IPPROTO_ICMP:
 491         case IPPROTO_ICMPV6:
 492                 port = htons(fl->fl_icmp_type);
 493                 break;
 494         default:
 495                 port = 0;       /*XXX*/
 496         }
 497         return port;
 498 }
 499
 500 static __inline__
 501 u16 xfrm_flowi_dport(struct flowi *fl)
 502 {
 503         u16 port;
 504         switch(fl->proto) {
 505         case IPPROTO_TCP:
 506         case IPPROTO_UDP:
 507         case IPPROTO_SCTP:
 508                 port = fl->fl_ip_dport;
 509                 break;
 510         case IPPROTO_ICMP:
 511         case IPPROTO_ICMPV6:
 512                 port = htons(fl->fl_icmp_code);
 513                 break;
 514         default:
 515                 port = 0;       /*XXX*/
 516         }
 517         return port;
 518 }
 519
 520 static inline int
 521 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
 522 {
 523         return  addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
 524                 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
 525                 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
 526                 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
 527                 (fl->proto == sel->proto || !sel->proto) &&
 528                 (fl->oif == sel->ifindex || !sel->ifindex);
 529 }
 530
 531 static inline int
 532 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
 533 {
 534         return  addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
 535                 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
 536                 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
 537                 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
 538                 (fl->proto == sel->proto || !sel->proto) &&
 539                 (fl->oif == sel->ifindex || !sel->ifindex);
 540 }
 541
 542 static inline int
 543 xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
 544                     unsigned short family)
 545 {
 546         switch (family) {
 547         case AF_INET:
 548                 return __xfrm4_selector_match(sel, fl);
 549         case AF_INET6:
 550                 return __xfrm6_selector_match(sel, fl);
 551         }
 552         return 0;
 553 }
 554
 555 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 556 /*      If neither has a context --> match
 557  *      Otherwise, both must have a context and the sids, doi, alg must match
 558  */
 559 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 560 {
 561         return ((!s1 && !s2) ||
 562                 (s1 && s2 &&
 563                  (s1->ctx_sid == s2->ctx_sid) &&
 564                  (s1->ctx_doi == s2->ctx_doi) &&
 565                  (s1->ctx_alg == s2->ctx_alg)));
 566 }
 567 #else
 568 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 569 {
 570         return 1;
 571 }
 572 #endif
 573
 574 /* A struct encoding bundle of transformations to apply to some set of flow.
 575  *
 576  * dst->child points to the next element of bundle.
 577  * dst->xfrm  points to an instanse of transformer.
 578  *
 579  * Due to unfortunate limitations of current routing cache, which we
 580  * have no time to fix, it mirrors struct rtable and bound to the same
 581  * routing key, including saddr,daddr. However, we can have many of
 582  * bundles differing by session id. All the bundles grow from a parent
 583  * policy rule.
 584  */
 585 struct xfrm_dst
 586 {
 587         union {
 588                 struct xfrm_dst         *next;
 589                 struct dst_entry        dst;
 590                 struct rtable           rt;
 591                 struct rt6_info         rt6;
 592         } u;
 593         struct dst_entry *route;
 594         u32 route_mtu_cached;
 595         u32 child_mtu_cached;
 596         u32 route_cookie;
 597         u32 path_cookie;
 598 };
 599
 600 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
 601 {
 602         dst_release(xdst->route);
 603         if (likely(xdst->u.dst.xfrm))
 604                 xfrm_state_put(xdst->u.dst.xfrm);
 605 }
 606
 607 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
 608
 609 /* Decapsulation state, used by the input to store data during
 610  * decapsulation procedure, to be used later (during the policy
 611  * check
 612  */
 613 struct xfrm_decap_state {
 614         char    decap_data[20];
 615         __u16   decap_type;
 616 };
 617
 618 struct sec_decap_state {
 619         struct xfrm_state       *xvec;
 620         struct xfrm_decap_state decap;
 621 };
 622
 623 struct sec_path
 624 {
 625         atomic_t                refcnt;
 626         int                     len;
 627         struct sec_decap_state  x[XFRM_MAX_DEPTH];
 628 };
 629
 630 static inline struct sec_path *
 631 secpath_get(struct sec_path *sp)
 632 {
 633         if (sp)
 634                 atomic_inc(&sp->refcnt);
 635         return sp;
 636 }
 637
 638 extern void __secpath_destroy(struct sec_path *sp);
 639
 640 static inline void
 641 secpath_put(struct sec_path *sp)
 642 {
 643         if (sp && atomic_dec_and_test(&sp->refcnt))
 644                 __secpath_destroy(sp);
 645 }
 646
 647 extern struct sec_path *secpath_dup(struct sec_path *src);
 648
 649 static inline void
 650 secpath_reset(struct sk_buff *skb)
 651 {
 652 #ifdef CONFIG_XFRM
 653         secpath_put(skb->sp);
 654         skb->sp = NULL;
 655 #endif
 656 }
 657
 658 static inline int
 659 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 660 {
 661         return  (tmpl->saddr.a4 &&
 662                  tmpl->saddr.a4 != x->props.saddr.a4);
 663 }
 664
 665 static inline int
 666 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 667 {
 668         return  (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
 669                  ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
 670 }
 671
 672 static inline int
 673 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
 674 {
 675         switch (family) {
 676         case AF_INET:
 677                 return __xfrm4_state_addr_cmp(tmpl, x);
 678         case AF_INET6:
 679                 return __xfrm6_state_addr_cmp(tmpl, x);
 680         }
 681         return !0;
 682 }
 683
 684 #ifdef CONFIG_XFRM
 685
 686 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
 687
 688 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
 689 {
 690         if (sk && sk->sk_policy[XFRM_POLICY_IN])
 691                 return __xfrm_policy_check(sk, dir, skb, family);
 692
 693         return  (!xfrm_policy_list[dir] && !skb->sp) ||
 694                 (skb->dst->flags & DST_NOPOLICY) ||
 695                 __xfrm_policy_check(sk, dir, skb, family);
 696 }
 697
 698 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 699 {
 700         return xfrm_policy_check(sk, dir, skb, AF_INET);
 701 }
 702
 703 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 704 {
 705         return xfrm_policy_check(sk, dir, skb, AF_INET6);
 706 }
 707
 708 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
 709 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
 710
 711 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
 712 {
 713         return  !xfrm_policy_list[XFRM_POLICY_OUT] ||
 714                 (skb->dst->flags & DST_NOXFRM) ||
 715                 __xfrm_route_forward(skb, family);
 716 }
 717
 718 static inline int xfrm4_route_forward(struct sk_buff *skb)
 719 {
 720         return xfrm_route_forward(skb, AF_INET);
 721 }
 722
 723 static inline int xfrm6_route_forward(struct sk_buff *skb)
 724 {
 725         return xfrm_route_forward(skb, AF_INET6);
 726 }
 727
 728 extern int __xfrm_sk_clone_policy(struct sock *sk);
 729
 730 static inline int xfrm_sk_clone_policy(struct sock *sk)
 731 {
 732         if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
 733                 return __xfrm_sk_clone_policy(sk);
 734         return 0;
 735 }
 736
 737 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
 738
 739 static inline void xfrm_sk_free_policy(struct sock *sk)
 740 {
 741         if (unlikely(sk->sk_policy[0] != NULL)) {
 742                 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
 743                 sk->sk_policy[0] = NULL;
 744         }
 745         if (unlikely(sk->sk_policy[1] != NULL)) {
 746                 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
 747                 sk->sk_policy[1] = NULL;
 748         }
 749 }
 750
 751 #else
 752
 753 static inline void xfrm_sk_free_policy(struct sock *sk) {}
 754 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
 755 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
 756 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
 757 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 758 {
 759         return 1;
 760 }
 761 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 762 {
 763         return 1;
 764 }
 765 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
 766 {
 767         return 1;
 768 }
 769 #endif
 770
 771 static __inline__
 772 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
 773 {
 774         switch (family){
 775         case AF_INET:
 776                 return (xfrm_address_t *)&fl->fl4_dst;
 777         case AF_INET6:
 778                 return (xfrm_address_t *)&fl->fl6_dst;
 779         }
 780         return NULL;
 781 }
 782
 783 static __inline__
 784 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
 785 {
 786         switch (family){
 787         case AF_INET:
 788                 return (xfrm_address_t *)&fl->fl4_src;
 789         case AF_INET6:
 790                 return (xfrm_address_t *)&fl->fl6_src;
 791         }
 792         return NULL;
 793 }
 794
 795 static __inline__ int
 796 __xfrm4_state_addr_check(struct xfrm_state *x,
 797                          xfrm_address_t *daddr, xfrm_address_t *saddr)
 798 {
 799         if (daddr->a4 == x->id.daddr.a4 &&
 800             (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
 801                 return 1;
 802         return 0;
 803 }
 804
 805 static __inline__ int
 806 __xfrm6_state_addr_check(struct xfrm_state *x,
 807                          xfrm_address_t *daddr, xfrm_address_t *saddr)
 808 {
 809         if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
 810             (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
 811              ipv6_addr_any((struct in6_addr *)saddr) ||
 812              ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
 813                 return 1;
 814         return 0;
 815 }
 816
 817 static __inline__ int
 818 xfrm_state_addr_check(struct xfrm_state *x,
 819                       xfrm_address_t *daddr, xfrm_address_t *saddr,
 820                       unsigned short family)
 821 {
 822         switch (family) {
 823         case AF_INET:
 824                 return __xfrm4_state_addr_check(x, daddr, saddr);
 825         case AF_INET6:
 826                 return __xfrm6_state_addr_check(x, daddr, saddr);
 827         }
 828         return 0;
 829 }
 830
 831 static inline int xfrm_state_kern(struct xfrm_state *x)
 832 {
 833         return atomic_read(&x->tunnel_users);
 834 }
 835
 836 /*
 837  * xfrm algorithm information
 838  */
 839 struct xfrm_algo_auth_info {
 840         u16 icv_truncbits;
 841         u16 icv_fullbits;
 842 };
 843
 844 struct xfrm_algo_encr_info {
 845         u16 blockbits;
 846         u16 defkeybits;
 847 };
 848
 849 struct xfrm_algo_comp_info {
 850         u16 threshold;
 851 };
 852
 853 struct xfrm_algo_desc {
 854         char *name;
 855         u8 available:1;
 856         union {
 857                 struct xfrm_algo_auth_info auth;
 858                 struct xfrm_algo_encr_info encr;
 859                 struct xfrm_algo_comp_info comp;
 860         } uinfo;
 861         struct sadb_alg desc;
 862 };
 863
 864 /* XFRM tunnel handlers.  */
 865 struct xfrm_tunnel {
 866         int (*handler)(struct sk_buff *skb);
 867         void (*err_handler)(struct sk_buff *skb, __u32 info);
 868 };
 869
 870 struct xfrm6_tunnel {
 871         int (*handler)(struct sk_buff **pskb);
 872         void (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
 873                             int type, int code, int offset, __u32 info);
 874 };
 875
 876 extern void xfrm_init(void);
 877 extern void xfrm4_init(void);
 878 extern void xfrm6_init(void);
 879 extern void xfrm6_fini(void);
 880 extern void xfrm_state_init(void);
 881 extern void xfrm4_state_init(void);
 882 extern void xfrm6_state_init(void);
 883 extern void xfrm6_state_fini(void);
 884
 885 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
 886 extern struct xfrm_state *xfrm_state_alloc(void);
 887 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
 888                                           struct flowi *fl, struct xfrm_tmpl *tmpl,
 889                                           struct xfrm_policy *pol, int *err,
 890                                           unsigned short family);
 891 extern int xfrm_state_check_expire(struct xfrm_state *x);
 892 extern void xfrm_state_insert(struct xfrm_state *x);
 893 extern int xfrm_state_add(struct xfrm_state *x);
 894 extern int xfrm_state_update(struct xfrm_state *x);
 895 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
 896 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
 897 extern int xfrm_state_delete(struct xfrm_state *x);
 898 extern void xfrm_state_flush(u8 proto);
 899 extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
 900 extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
 901 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
 902 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
 903 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
 904 extern int xfrm_init_state(struct xfrm_state *x);
 905 extern int xfrm4_rcv(struct sk_buff *skb);
 906 extern int xfrm4_output(struct sk_buff *skb);
 907 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
 908 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
 909 extern int xfrm6_rcv_spi(struct sk_buff **pskb, u32 spi);
 910 extern int xfrm6_rcv(struct sk_buff **pskb);
 911 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
 912 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
 913 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
 914 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
 915 extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
 916 extern int xfrm6_output(struct sk_buff *skb);
 917
 918 #ifdef CONFIG_XFRM
 919 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
 920 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
 921 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
 922 #else
 923 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
 924 {
 925         return -ENOPROTOOPT;
 926 }
 927
 928 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
 929 {
 930         /* should not happen */
 931         kfree_skb(skb);
 932         return 0;
 933 }
 934 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
 935 {
 936         return -EINVAL;
 937 }
 938 #endif
 939
 940 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
 941 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
 942 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
 943 struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel,
 944                                           struct xfrm_sec_ctx *ctx, int delete);
 945 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete);
 946 void xfrm_policy_flush(void);
 947 u32 xfrm_get_acqseq(void);
 948 void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
 949 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
 950                                   xfrm_address_t *daddr, xfrm_address_t *saddr,
 951                                   int create, unsigned short family);
 952 extern void xfrm_policy_flush(void);
 953 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
 954 extern int xfrm_flush_bundles(void);
 955 extern void xfrm_flush_all_bundles(void);
 956 extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family);
 957 extern void xfrm_init_pmtu(struct dst_entry *dst);
 958
 959 extern wait_queue_head_t km_waitq;
 960 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
 961 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
 962
 963 extern void xfrm_input_init(void);
 964 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq);
 965
 966 extern void xfrm_probe_algs(void);
 967 extern int xfrm_count_auth_supported(void);
 968 extern int xfrm_count_enc_supported(void);
 969 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
 970 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
 971 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
 972 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
 973 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
 974 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
 975 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
 976 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
 977
 978 struct crypto_tfm;
 979 typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int);
 980
 981 extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm,
 982                          int offset, int len, icv_update_fn_t icv_update);
 983
 984 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
 985                                 int family)
 986 {
 987         switch (family) {
 988         default:
 989         case AF_INET:
 990                 return a->a4 - b->a4;
 991         case AF_INET6:
 992                 return ipv6_addr_cmp((struct in6_addr *)a,
 993                                      (struct in6_addr *)b);
 994         }
 995 }
 996
 997 static inline int xfrm_policy_id2dir(u32 index)
 998 {
 999         return index & 7;
1000 }
1001
1002 static inline int xfrm_aevent_is_on(void)
1003 {
1004         return netlink_has_listeners(xfrm_nl,XFRMNLGRP_AEVENTS);
1005 }
1006
1007 static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
1008 {
1009         if (xfrm_aevent_is_on())
1010                 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1011 }
1012
1013
1014 #endif  /* _NET_XFRM_H */