include/net/xfrm.h

   1 #ifndef _NET_XFRM_H
   2 #define _NET_XFRM_H
   3
   4 #include <linux/compiler.h>
   5 #include <linux/xfrm.h>
   6 #include <linux/spinlock.h>
   7 #include <linux/list.h>
   8 #include <linux/skbuff.h>
   9 #include <linux/netdevice.h>
  10 #include <linux/crypto.h>
  11 #include <linux/pfkeyv2.h>
  12 #include <linux/in6.h>
  13
  14 #include <net/sock.h>
  15 #include <net/dst.h>
  16 #include <net/route.h>
  17 #include <net/ipv6.h>
  18 #include <net/ip6_fib.h>
  19
  20 #define XFRM_ALIGN8(len)        (((len) + 7) & ~7)
  21
  22 extern struct semaphore xfrm_cfg_sem;
  23
  24 /* Organization of SPD aka "XFRM rules"
  25    ------------------------------------
  26
  27    Basic objects:
  28    - policy rule, struct xfrm_policy (=SPD entry)
  29    - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
  30    - instance of a transformer, struct xfrm_state (=SA)
  31    - template to clone xfrm_state, struct xfrm_tmpl
  32
  33    SPD is plain linear list of xfrm_policy rules, ordered by priority.
  34    (To be compatible with existing pfkeyv2 implementations,
  35    many rules with priority of 0x7fffffff are allowed to exist and
  36    such rules are ordered in an unpredictable way, thanks to bsd folks.)
  37
  38    Lookup is plain linear search until the first match with selector.
  39
  40    If "action" is "block", then we prohibit the flow, otherwise:
  41    if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
  42    policy entry has list of up to XFRM_MAX_DEPTH transformations,
  43    described by templates xfrm_tmpl. Each template is resolved
  44    to a complete xfrm_state (see below) and we pack bundle of transformations
  45    to a dst_entry returned to requestor.
  46
  47    dst -. xfrm  .-> xfrm_state #1
  48     |---. child .-> dst -. xfrm .-> xfrm_state #2
  49                      |---. child .-> dst -. xfrm .-> xfrm_state #3
  50                                       |---. child .-> NULL
  51
  52    Bundles are cached at xrfm_policy struct (field ->bundles).
  53
  54
  55    Resolution of xrfm_tmpl
  56    -----------------------
  57    Template contains:
  58    1. ->mode            Mode: transport or tunnel
  59    2. ->id.proto        Protocol: AH/ESP/IPCOMP
  60    3. ->id.daddr        Remote tunnel endpoint, ignored for transport mode.
  61       Q: allow to resolve security gateway?
  62    4. ->id.spi          If not zero, static SPI.
  63    5. ->saddr           Local tunnel endpoint, ignored for transport mode.
  64    6. ->algos           List of allowed algos. Plain bitmask now.
  65       Q: ealgos, aalgos, calgos. What a mess...
  66    7. ->share           Sharing mode.
  67       Q: how to implement private sharing mode? To add struct sock* to
  68       flow id?
  69
  70    Having this template we search through SAD searching for entries
  71    with appropriate mode/proto/algo, permitted by selector.
  72    If no appropriate entry found, it is requested from key manager.
  73
  74    PROBLEMS:
  75    Q: How to find all the bundles referring to a physical path for
  76       PMTU discovery? Seems, dst should contain list of all parents...
  77       and enter to infinite locking hierarchy disaster.
  78       No! It is easier, we will not search for them, let them find us.
  79       We add genid to each dst plus pointer to genid of raw IP route,
  80       pmtu disc will update pmtu on raw IP route and increase its genid.
  81       dst_check() will see this for top level and trigger resyncing
  82       metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
  83  */
  84
  85 /* Full description of state of transformer. */
  86 struct xfrm_state
  87 {
  88         /* Note: bydst is re-used during gc */
  89         struct list_head        bydst;
  90         struct list_head        byspi;
  91
  92         atomic_t                refcnt;
  93         spinlock_t              lock;
  94
  95         struct xfrm_id          id;
  96         struct xfrm_selector    sel;
  97
  98         /* Key manger bits */
  99         struct {
 100                 u8              state;
 101                 u8              dying;
 102                 u32             seq;
 103         } km;
 104
 105         /* Parameters of this state. */
 106         struct {
 107                 u32             reqid;
 108                 u8              mode;
 109                 u8              replay_window;
 110                 u8              aalgo, ealgo, calgo;
 111                 u8              flags;
 112                 u16             family;
 113                 xfrm_address_t  saddr;
 114                 int             header_len;
 115                 int             trailer_len;
 116         } props;
 117
 118         struct xfrm_lifetime_cfg lft;
 119
 120         /* Data for transformer */
 121         struct xfrm_algo        *aalg;
 122         struct xfrm_algo        *ealg;
 123         struct xfrm_algo        *calg;
 124
 125         /* Data for encapsulator */
 126         struct xfrm_encap_tmpl  *encap;
 127
 128         /* IPComp needs an IPIP tunnel for handling uncompressed packets */
 129         struct xfrm_state       *tunnel;
 130
 131         /* If a tunnel, number of users + 1 */
 132         atomic_t                tunnel_users;
 133
 134         /* State for replay detection */
 135         struct xfrm_replay_state replay;
 136
 137         /* Statistics */
 138         struct xfrm_stats       stats;
 139
 140         struct xfrm_lifetime_cur curlft;
 141         struct timer_list       timer;
 142
 143         /* Reference to data common to all the instances of this
 144          * transformer. */
 145         struct xfrm_type        *type;
 146
 147         /* Private data of this transformer, format is opaque,
 148          * interpreted by xfrm_type methods. */
 149         void                    *data;
 150 };
 151
 152 enum {
 153         XFRM_STATE_VOID,
 154         XFRM_STATE_ACQ,
 155         XFRM_STATE_VALID,
 156         XFRM_STATE_ERROR,
 157         XFRM_STATE_EXPIRED,
 158         XFRM_STATE_DEAD
 159 };
 160
 161 /* callback structure passed from either netlink or pfkey */
 162 struct km_event
 163 {
 164         union {
 165                 u32 hard;
 166                 u32 proto;
 167                 u32 byid;
 168         } data;
 169
 170         u32     seq;
 171         u32     pid;
 172         u32     event;
 173 };
 174
 175 struct xfrm_type;
 176 struct xfrm_dst;
 177 struct xfrm_policy_afinfo {
 178         unsigned short          family;
 179         rwlock_t                lock;
 180         struct xfrm_type_map    *type_map;
 181         struct dst_ops          *dst_ops;
 182         void                    (*garbage_collect)(void);
 183         int                     (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
 184         struct dst_entry        *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
 185         int                     (*bundle_create)(struct xfrm_policy *policy,
 186                                                  struct xfrm_state **xfrm,
 187                                                  int nx,
 188                                                  struct flowi *fl,
 189                                                  struct dst_entry **dst_p);
 190         void                    (*decode_session)(struct sk_buff *skb,
 191                                                   struct flowi *fl);
 192 };
 193
 194 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
 195 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
 196 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
 197 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
 198
 199 #define XFRM_ACQ_EXPIRES        30
 200
 201 struct xfrm_tmpl;
 202 struct xfrm_state_afinfo {
 203         unsigned short          family;
 204         rwlock_t                lock;
 205         struct list_head        *state_bydst;
 206         struct list_head        *state_byspi;
 207         void                    (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
 208                                                 struct xfrm_tmpl *tmpl,
 209                                                 xfrm_address_t *daddr, xfrm_address_t *saddr);
 210         struct xfrm_state       *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto);
 211         struct xfrm_state       *(*find_acq)(u8 mode, u32 reqid, u8 proto,
 212                                              xfrm_address_t *daddr, xfrm_address_t *saddr,
 213                                              int create);
 214 };
 215
 216 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
 217 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
 218
 219 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
 220
 221 struct xfrm_decap_state;
 222 struct xfrm_type
 223 {
 224         char                    *description;
 225         struct module           *owner;
 226         __u8                    proto;
 227
 228         int                     (*init_state)(struct xfrm_state *x);
 229         void                    (*destructor)(struct xfrm_state *);
 230         int                     (*input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
 231         int                     (*post_input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
 232         int                     (*output)(struct xfrm_state *, struct sk_buff *pskb);
 233         /* Estimate maximal size of result of transformation of a dgram */
 234         u32                     (*get_max_size)(struct xfrm_state *, int size);
 235 };
 236
 237 struct xfrm_type_map {
 238         rwlock_t                lock;
 239         struct xfrm_type        *map[256];
 240 };
 241
 242 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
 243 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
 244 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
 245 extern void xfrm_put_type(struct xfrm_type *type);
 246
 247 struct xfrm_tmpl
 248 {
 249 /* id in template is interpreted as:
 250  * daddr - destination of tunnel, may be zero for transport mode.
 251  * spi   - zero to acquire spi. Not zero if spi is static, then
 252  *         daddr must be fixed too.
 253  * proto - AH/ESP/IPCOMP
 254  */
 255         struct xfrm_id          id;
 256
 257 /* Source address of tunnel. Ignored, if it is not a tunnel. */
 258         xfrm_address_t          saddr;
 259
 260         __u32                   reqid;
 261
 262 /* Mode: transport/tunnel */
 263         __u8                    mode;
 264
 265 /* Sharing mode: unique, this session only, this user only etc. */
 266         __u8                    share;
 267
 268 /* May skip this transfomration if no SA is found */
 269         __u8                    optional;
 270
 271 /* Bit mask of algos allowed for acquisition */
 272         __u32                   aalgos;
 273         __u32                   ealgos;
 274         __u32                   calgos;
 275 };
 276
 277 #define XFRM_MAX_DEPTH          4
 278
 279 struct xfrm_policy
 280 {
 281         struct xfrm_policy      *next;
 282         struct list_head        list;
 283
 284         /* This lock only affects elements except for entry. */
 285         rwlock_t                lock;
 286         atomic_t                refcnt;
 287         struct timer_list       timer;
 288
 289         u32                     priority;
 290         u32                     index;
 291         struct xfrm_selector    selector;
 292         struct xfrm_lifetime_cfg lft;
 293         struct xfrm_lifetime_cur curlft;
 294         struct dst_entry       *bundles;
 295         __u16                   family;
 296         __u8                    action;
 297         __u8                    flags;
 298         __u8                    dead;
 299         __u8                    xfrm_nr;
 300         struct xfrm_tmpl        xfrm_vec[XFRM_MAX_DEPTH];
 301 };
 302
 303 #define XFRM_KM_TIMEOUT         30
 304
 305 struct xfrm_mgr
 306 {
 307         struct list_head        list;
 308         char                    *id;
 309         int                     (*notify)(struct xfrm_state *x, struct km_event *c);
 310         int                     (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
 311         struct xfrm_policy      *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir);
 312         int                     (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
 313         int                     (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
 314 };
 315
 316 extern int xfrm_register_km(struct xfrm_mgr *km);
 317 extern int xfrm_unregister_km(struct xfrm_mgr *km);
 318
 319
 320 extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
 321
 322 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
 323 {
 324         if (likely(policy != NULL))
 325                 atomic_inc(&policy->refcnt);
 326 }
 327
 328 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
 329
 330 static inline void xfrm_pol_put(struct xfrm_policy *policy)
 331 {
 332         if (atomic_dec_and_test(&policy->refcnt))
 333                 __xfrm_policy_destroy(policy);
 334 }
 335
 336 #define XFRM_DST_HSIZE          1024
 337
 338 static __inline__
 339 unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
 340 {
 341         unsigned h;
 342         h = ntohl(addr->a4);
 343         h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
 344         return h;
 345 }
 346
 347 static __inline__
 348 unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
 349 {
 350         unsigned h;
 351         h = ntohl(addr->a6[2]^addr->a6[3]);
 352         h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
 353         return h;
 354 }
 355
 356 static __inline__
 357 unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
 358 {
 359         switch (family) {
 360         case AF_INET:
 361                 return __xfrm4_dst_hash(addr);
 362         case AF_INET6:
 363                 return __xfrm6_dst_hash(addr);
 364         }
 365         return 0;
 366 }
 367
 368 static __inline__
 369 unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
 370 {
 371         unsigned h;
 372         h = ntohl(addr->a4^spi^proto);
 373         h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
 374         return h;
 375 }
 376
 377 static __inline__
 378 unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
 379 {
 380         unsigned h;
 381         h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
 382         h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
 383         return h;
 384 }
 385
 386 static __inline__
 387 unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
 388 {
 389         switch (family) {
 390         case AF_INET:
 391                 return __xfrm4_spi_hash(addr, spi, proto);
 392         case AF_INET6:
 393                 return __xfrm6_spi_hash(addr, spi, proto);
 394         }
 395         return 0;       /*XXX*/
 396 }
 397
 398 extern void __xfrm_state_destroy(struct xfrm_state *);
 399
 400 static inline void xfrm_state_put(struct xfrm_state *x)
 401 {
 402         if (atomic_dec_and_test(&x->refcnt))
 403                 __xfrm_state_destroy(x);
 404 }
 405
 406 static inline void xfrm_state_hold(struct xfrm_state *x)
 407 {
 408         atomic_inc(&x->refcnt);
 409 }
 410
 411 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
 412 {
 413         __u32 *a1 = token1;
 414         __u32 *a2 = token2;
 415         int pdw;
 416         int pbi;
 417
 418         pdw = prefixlen >> 5;     /* num of whole __u32 in prefix */
 419         pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
 420
 421         if (pdw)
 422                 if (memcmp(a1, a2, pdw << 2))
 423                         return 0;
 424
 425         if (pbi) {
 426                 __u32 mask;
 427
 428                 mask = htonl((0xffffffff) << (32 - pbi));
 429
 430                 if ((a1[pdw] ^ a2[pdw]) & mask)
 431                         return 0;
 432         }
 433
 434         return 1;
 435 }
 436
 437 static __inline__
 438 u16 xfrm_flowi_sport(struct flowi *fl)
 439 {
 440         u16 port;
 441         switch(fl->proto) {
 442         case IPPROTO_TCP:
 443         case IPPROTO_UDP:
 444         case IPPROTO_SCTP:
 445                 port = fl->fl_ip_sport;
 446                 break;
 447         case IPPROTO_ICMP:
 448         case IPPROTO_ICMPV6:
 449                 port = htons(fl->fl_icmp_type);
 450                 break;
 451         default:
 452                 port = 0;       /*XXX*/
 453         }
 454         return port;
 455 }
 456
 457 static __inline__
 458 u16 xfrm_flowi_dport(struct flowi *fl)
 459 {
 460         u16 port;
 461         switch(fl->proto) {
 462         case IPPROTO_TCP:
 463         case IPPROTO_UDP:
 464         case IPPROTO_SCTP:
 465                 port = fl->fl_ip_dport;
 466                 break;
 467         case IPPROTO_ICMP:
 468         case IPPROTO_ICMPV6:
 469                 port = htons(fl->fl_icmp_code);
 470                 break;
 471         default:
 472                 port = 0;       /*XXX*/
 473         }
 474         return port;
 475 }
 476
 477 static inline int
 478 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
 479 {
 480         return  addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
 481                 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
 482                 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
 483                 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
 484                 (fl->proto == sel->proto || !sel->proto) &&
 485                 (fl->oif == sel->ifindex || !sel->ifindex);
 486 }
 487
 488 static inline int
 489 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
 490 {
 491         return  addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
 492                 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
 493                 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
 494                 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
 495                 (fl->proto == sel->proto || !sel->proto) &&
 496                 (fl->oif == sel->ifindex || !sel->ifindex);
 497 }
 498
 499 static inline int
 500 xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
 501                     unsigned short family)
 502 {
 503         switch (family) {
 504         case AF_INET:
 505                 return __xfrm4_selector_match(sel, fl);
 506         case AF_INET6:
 507                 return __xfrm6_selector_match(sel, fl);
 508         }
 509         return 0;
 510 }
 511
 512 /* A struct encoding bundle of transformations to apply to some set of flow.
 513  *
 514  * dst->child points to the next element of bundle.
 515  * dst->xfrm  points to an instanse of transformer.
 516  *
 517  * Due to unfortunate limitations of current routing cache, which we
 518  * have no time to fix, it mirrors struct rtable and bound to the same
 519  * routing key, including saddr,daddr. However, we can have many of
 520  * bundles differing by session id. All the bundles grow from a parent
 521  * policy rule.
 522  */
 523 struct xfrm_dst
 524 {
 525         union {
 526                 struct xfrm_dst         *next;
 527                 struct dst_entry        dst;
 528                 struct rtable           rt;
 529                 struct rt6_info         rt6;
 530         } u;
 531         struct dst_entry *route;
 532         u32 route_mtu_cached;
 533         u32 child_mtu_cached;
 534         u32 route_cookie;
 535         u32 path_cookie;
 536 };
 537
 538 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
 539 {
 540         dst_release(xdst->route);
 541         if (likely(xdst->u.dst.xfrm))
 542                 xfrm_state_put(xdst->u.dst.xfrm);
 543 }
 544
 545 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
 546
 547 /* Decapsulation state, used by the input to store data during
 548  * decapsulation procedure, to be used later (during the policy
 549  * check
 550  */
 551 struct xfrm_decap_state {
 552         char    decap_data[20];
 553         __u16   decap_type;
 554 };
 555
 556 struct sec_decap_state {
 557         struct xfrm_state       *xvec;
 558         struct xfrm_decap_state decap;
 559 };
 560
 561 struct sec_path
 562 {
 563         atomic_t                refcnt;
 564         int                     len;
 565         struct sec_decap_state  x[XFRM_MAX_DEPTH];
 566 };
 567
 568 static inline struct sec_path *
 569 secpath_get(struct sec_path *sp)
 570 {
 571         if (sp)
 572                 atomic_inc(&sp->refcnt);
 573         return sp;
 574 }
 575
 576 extern void __secpath_destroy(struct sec_path *sp);
 577
 578 static inline void
 579 secpath_put(struct sec_path *sp)
 580 {
 581         if (sp && atomic_dec_and_test(&sp->refcnt))
 582                 __secpath_destroy(sp);
 583 }
 584
 585 extern struct sec_path *secpath_dup(struct sec_path *src);
 586
 587 static inline void
 588 secpath_reset(struct sk_buff *skb)
 589 {
 590 #ifdef CONFIG_XFRM
 591         secpath_put(skb->sp);
 592         skb->sp = NULL;
 593 #endif
 594 }
 595
 596 static inline int
 597 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 598 {
 599         return  (tmpl->saddr.a4 &&
 600                  tmpl->saddr.a4 != x->props.saddr.a4);
 601 }
 602
 603 static inline int
 604 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 605 {
 606         return  (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
 607                  ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
 608 }
 609
 610 static inline int
 611 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
 612 {
 613         switch (family) {
 614         case AF_INET:
 615                 return __xfrm4_state_addr_cmp(tmpl, x);
 616         case AF_INET6:
 617                 return __xfrm6_state_addr_cmp(tmpl, x);
 618         }
 619         return !0;
 620 }
 621
 622 #ifdef CONFIG_XFRM
 623
 624 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
 625
 626 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
 627 {
 628         if (sk && sk->sk_policy[XFRM_POLICY_IN])
 629                 return __xfrm_policy_check(sk, dir, skb, family);
 630
 631         return  (!xfrm_policy_list[dir] && !skb->sp) ||
 632                 (skb->dst->flags & DST_NOPOLICY) ||
 633                 __xfrm_policy_check(sk, dir, skb, family);
 634 }
 635
 636 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 637 {
 638         return xfrm_policy_check(sk, dir, skb, AF_INET);
 639 }
 640
 641 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 642 {
 643         return xfrm_policy_check(sk, dir, skb, AF_INET6);
 644 }
 645
 646
 647 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
 648
 649 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
 650 {
 651         return  !xfrm_policy_list[XFRM_POLICY_OUT] ||
 652                 (skb->dst->flags & DST_NOXFRM) ||
 653                 __xfrm_route_forward(skb, family);
 654 }
 655
 656 static inline int xfrm4_route_forward(struct sk_buff *skb)
 657 {
 658         return xfrm_route_forward(skb, AF_INET);
 659 }
 660
 661 static inline int xfrm6_route_forward(struct sk_buff *skb)
 662 {
 663         return xfrm_route_forward(skb, AF_INET6);
 664 }
 665
 666 extern int __xfrm_sk_clone_policy(struct sock *sk);
 667
 668 static inline int xfrm_sk_clone_policy(struct sock *sk)
 669 {
 670         if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
 671                 return __xfrm_sk_clone_policy(sk);
 672         return 0;
 673 }
 674
 675 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
 676
 677 static inline void xfrm_sk_free_policy(struct sock *sk)
 678 {
 679         if (unlikely(sk->sk_policy[0] != NULL)) {
 680                 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
 681                 sk->sk_policy[0] = NULL;
 682         }
 683         if (unlikely(sk->sk_policy[1] != NULL)) {
 684                 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
 685                 sk->sk_policy[1] = NULL;
 686         }
 687 }
 688
 689 #else
 690
 691 static inline void xfrm_sk_free_policy(struct sock *sk) {}
 692 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
 693 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
 694 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
 695 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 696 {
 697         return 1;
 698 }
 699 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 700 {
 701         return 1;
 702 }
 703 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
 704 {
 705         return 1;
 706 }
 707 #endif
 708
 709 static __inline__
 710 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
 711 {
 712         switch (family){
 713         case AF_INET:
 714                 return (xfrm_address_t *)&fl->fl4_dst;
 715         case AF_INET6:
 716                 return (xfrm_address_t *)&fl->fl6_dst;
 717         }
 718         return NULL;
 719 }
 720
 721 static __inline__
 722 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
 723 {
 724         switch (family){
 725         case AF_INET:
 726                 return (xfrm_address_t *)&fl->fl4_src;
 727         case AF_INET6:
 728                 return (xfrm_address_t *)&fl->fl6_src;
 729         }
 730         return NULL;
 731 }
 732
 733 static __inline__ int
 734 __xfrm4_state_addr_check(struct xfrm_state *x,
 735                          xfrm_address_t *daddr, xfrm_address_t *saddr)
 736 {
 737         if (daddr->a4 == x->id.daddr.a4 &&
 738             (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
 739                 return 1;
 740         return 0;
 741 }
 742
 743 static __inline__ int
 744 __xfrm6_state_addr_check(struct xfrm_state *x,
 745                          xfrm_address_t *daddr, xfrm_address_t *saddr)
 746 {
 747         if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
 748             (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
 749              ipv6_addr_any((struct in6_addr *)saddr) ||
 750              ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
 751                 return 1;
 752         return 0;
 753 }
 754
 755 static __inline__ int
 756 xfrm_state_addr_check(struct xfrm_state *x,
 757                       xfrm_address_t *daddr, xfrm_address_t *saddr,
 758                       unsigned short family)
 759 {
 760         switch (family) {
 761         case AF_INET:
 762                 return __xfrm4_state_addr_check(x, daddr, saddr);
 763         case AF_INET6:
 764                 return __xfrm6_state_addr_check(x, daddr, saddr);
 765         }
 766         return 0;
 767 }
 768
 769 static inline int xfrm_state_kern(struct xfrm_state *x)
 770 {
 771         return atomic_read(&x->tunnel_users);
 772 }
 773
 774 /*
 775  * xfrm algorithm information
 776  */
 777 struct xfrm_algo_auth_info {
 778         u16 icv_truncbits;
 779         u16 icv_fullbits;
 780 };
 781
 782 struct xfrm_algo_encr_info {
 783         u16 blockbits;
 784         u16 defkeybits;
 785 };
 786
 787 struct xfrm_algo_comp_info {
 788         u16 threshold;
 789 };
 790
 791 struct xfrm_algo_desc {
 792         char *name;
 793         u8 available:1;
 794         union {
 795                 struct xfrm_algo_auth_info auth;
 796                 struct xfrm_algo_encr_info encr;
 797                 struct xfrm_algo_comp_info comp;
 798         } uinfo;
 799         struct sadb_alg desc;
 800 };
 801
 802 /* XFRM tunnel handlers.  */
 803 struct xfrm_tunnel {
 804         int (*handler)(struct sk_buff *skb);
 805         void (*err_handler)(struct sk_buff *skb, void *info);
 806 };
 807
 808 struct xfrm6_tunnel {
 809         int (*handler)(struct sk_buff **pskb, unsigned int *nhoffp);
 810         void (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
 811                             int type, int code, int offset, __u32 info);
 812 };
 813
 814 extern void xfrm_init(void);
 815 extern void xfrm4_init(void);
 816 extern void xfrm6_init(void);
 817 extern void xfrm6_fini(void);
 818 extern void xfrm_state_init(void);
 819 extern void xfrm4_state_init(void);
 820 extern void xfrm4_state_fini(void);
 821 extern void xfrm6_state_init(void);
 822 extern void xfrm6_state_fini(void);
 823
 824 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
 825 extern struct xfrm_state *xfrm_state_alloc(void);
 826 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
 827                                           struct flowi *fl, struct xfrm_tmpl *tmpl,
 828                                           struct xfrm_policy *pol, int *err,
 829                                           unsigned short family);
 830 extern int xfrm_state_check_expire(struct xfrm_state *x);
 831 extern void xfrm_state_insert(struct xfrm_state *x);
 832 extern int xfrm_state_add(struct xfrm_state *x);
 833 extern int xfrm_state_update(struct xfrm_state *x);
 834 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
 835 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
 836 extern int xfrm_state_delete(struct xfrm_state *x);
 837 extern void xfrm_state_flush(u8 proto);
 838 extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
 839 extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
 840 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
 841 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
 842 extern int xfrm_init_state(struct xfrm_state *x);
 843 extern int xfrm4_rcv(struct sk_buff *skb);
 844 extern int xfrm4_output(struct sk_buff *skb);
 845 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
 846 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
 847 extern int xfrm6_rcv_spi(struct sk_buff **pskb, unsigned int *nhoffp, u32 spi);
 848 extern int xfrm6_rcv(struct sk_buff **pskb, unsigned int *nhoffp);
 849 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
 850 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
 851 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
 852 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
 853 extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
 854 extern int xfrm6_output(struct sk_buff *skb);
 855
 856 #ifdef CONFIG_XFRM
 857 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
 858 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
 859 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
 860 #else
 861 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
 862 {
 863         return -ENOPROTOOPT;
 864 }
 865
 866 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
 867 {
 868         /* should not happen */
 869         kfree_skb(skb);
 870         return 0;
 871 }
 872 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
 873 {
 874         return -EINVAL;
 875 }
 876 #endif
 877
 878 struct xfrm_policy *xfrm_policy_alloc(int gfp);
 879 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
 880 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
 881 struct xfrm_policy *xfrm_policy_bysel(int dir, struct xfrm_selector *sel,
 882                                       int delete);
 883 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete);
 884 void xfrm_policy_flush(void);
 885 u32 xfrm_get_acqseq(void);
 886 void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
 887 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
 888                                   xfrm_address_t *daddr, xfrm_address_t *saddr,
 889                                   int create, unsigned short family);
 890 extern void xfrm_policy_flush(void);
 891 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
 892 extern int xfrm_flush_bundles(void);
 893 extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family);
 894 extern void xfrm_init_pmtu(struct dst_entry *dst);
 895
 896 extern wait_queue_head_t km_waitq;
 897 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
 898 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard);
 899
 900 extern void xfrm_input_init(void);
 901 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq);
 902
 903 extern void xfrm_probe_algs(void);
 904 extern int xfrm_count_auth_supported(void);
 905 extern int xfrm_count_enc_supported(void);
 906 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
 907 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
 908 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
 909 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
 910 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
 911 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
 912 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
 913 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
 914
 915 struct crypto_tfm;
 916 typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int);
 917
 918 extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm,
 919                          int offset, int len, icv_update_fn_t icv_update);
 920
 921 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
 922                                 int family)
 923 {
 924         switch (family) {
 925         default:
 926         case AF_INET:
 927                 return a->a4 - b->a4;
 928         case AF_INET6:
 929                 return ipv6_addr_cmp((struct in6_addr *)a,
 930                                      (struct in6_addr *)b);
 931         }
 932 }
 933
 934 #endif  /* _NET_XFRM_H */