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 struct xfrm_type;
 162 struct xfrm_dst;
 163 struct xfrm_policy_afinfo {
 164         unsigned short          family;
 165         rwlock_t                lock;
 166         struct xfrm_type_map    *type_map;
 167         struct dst_ops          *dst_ops;
 168         void                    (*garbage_collect)(void);
 169         int                     (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
 170         struct dst_entry        *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
 171         int                     (*bundle_create)(struct xfrm_policy *policy,
 172                                                  struct xfrm_state **xfrm,
 173                                                  int nx,
 174                                                  struct flowi *fl,
 175                                                  struct dst_entry **dst_p);
 176         void                    (*decode_session)(struct sk_buff *skb,
 177                                                   struct flowi *fl);
 178 };
 179
 180 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
 181 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
 182
 183 #define XFRM_ACQ_EXPIRES        30
 184
 185 struct xfrm_tmpl;
 186 struct xfrm_state_afinfo {
 187         unsigned short          family;
 188         rwlock_t                lock;
 189         struct list_head        *state_bydst;
 190         struct list_head        *state_byspi;
 191         void                    (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
 192                                                 struct xfrm_tmpl *tmpl,
 193                                                 xfrm_address_t *daddr, xfrm_address_t *saddr);
 194         struct xfrm_state       *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto);
 195         struct xfrm_state       *(*find_acq)(u8 mode, u32 reqid, u8 proto,
 196                                              xfrm_address_t *daddr, xfrm_address_t *saddr,
 197                                              int create);
 198 };
 199
 200 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
 201 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
 202
 203 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
 204
 205 struct xfrm_decap_state;
 206 struct xfrm_type
 207 {
 208         char                    *description;
 209         struct module           *owner;
 210         __u8                    proto;
 211
 212         int                     (*init_state)(struct xfrm_state *x, void *args);
 213         void                    (*destructor)(struct xfrm_state *);
 214         int                     (*input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
 215         int                     (*post_input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
 216         int                     (*output)(struct xfrm_state *, struct sk_buff *pskb);
 217         /* Estimate maximal size of result of transformation of a dgram */
 218         u32                     (*get_max_size)(struct xfrm_state *, int size);
 219 };
 220
 221 struct xfrm_type_map {
 222         rwlock_t                lock;
 223         struct xfrm_type        *map[256];
 224 };
 225
 226 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
 227 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
 228 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
 229 extern void xfrm_put_type(struct xfrm_type *type);
 230
 231 struct xfrm_tmpl
 232 {
 233 /* id in template is interpreted as:
 234  * daddr - destination of tunnel, may be zero for transport mode.
 235  * spi   - zero to acquire spi. Not zero if spi is static, then
 236  *         daddr must be fixed too.
 237  * proto - AH/ESP/IPCOMP
 238  */
 239         struct xfrm_id          id;
 240
 241 /* Source address of tunnel. Ignored, if it is not a tunnel. */
 242         xfrm_address_t          saddr;
 243
 244         __u32                   reqid;
 245
 246 /* Mode: transport/tunnel */
 247         __u8                    mode;
 248
 249 /* Sharing mode: unique, this session only, this user only etc. */
 250         __u8                    share;
 251
 252 /* May skip this transfomration if no SA is found */
 253         __u8                    optional;
 254
 255 /* Bit mask of algos allowed for acquisition */
 256         __u32                   aalgos;
 257         __u32                   ealgos;
 258         __u32                   calgos;
 259 };
 260
 261 #define XFRM_MAX_DEPTH          4
 262
 263 struct xfrm_policy
 264 {
 265         struct xfrm_policy      *next;
 266         struct list_head        list;
 267
 268         /* This lock only affects elements except for entry. */
 269         rwlock_t                lock;
 270         atomic_t                refcnt;
 271         struct timer_list       timer;
 272
 273         u32                     priority;
 274         u32                     index;
 275         struct xfrm_selector    selector;
 276         struct xfrm_lifetime_cfg lft;
 277         struct xfrm_lifetime_cur curlft;
 278         struct dst_entry       *bundles;
 279         __u16                   family;
 280         __u8                    action;
 281         __u8                    flags;
 282         __u8                    dead;
 283         __u8                    xfrm_nr;
 284         struct xfrm_tmpl        xfrm_vec[XFRM_MAX_DEPTH];
 285 };
 286
 287 #define XFRM_KM_TIMEOUT         30
 288
 289 struct xfrm_mgr
 290 {
 291         struct list_head        list;
 292         char                    *id;
 293         int                     (*notify)(struct xfrm_state *x, int event);
 294         int                     (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
 295         struct xfrm_policy      *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir);
 296         int                     (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
 297         int                     (*notify_policy)(struct xfrm_policy *x, int dir, int event);
 298 };
 299
 300 extern int xfrm_register_km(struct xfrm_mgr *km);
 301 extern int xfrm_unregister_km(struct xfrm_mgr *km);
 302
 303
 304 extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
 305
 306 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
 307 {
 308         if (likely(policy != NULL))
 309                 atomic_inc(&policy->refcnt);
 310 }
 311
 312 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
 313
 314 static inline void xfrm_pol_put(struct xfrm_policy *policy)
 315 {
 316         if (atomic_dec_and_test(&policy->refcnt))
 317                 __xfrm_policy_destroy(policy);
 318 }
 319
 320 #define XFRM_DST_HSIZE          1024
 321
 322 static __inline__
 323 unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
 324 {
 325         unsigned h;
 326         h = ntohl(addr->a4);
 327         h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
 328         return h;
 329 }
 330
 331 static __inline__
 332 unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
 333 {
 334         unsigned h;
 335         h = ntohl(addr->a6[2]^addr->a6[3]);
 336         h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
 337         return h;
 338 }
 339
 340 static __inline__
 341 unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
 342 {
 343         switch (family) {
 344         case AF_INET:
 345                 return __xfrm4_dst_hash(addr);
 346         case AF_INET6:
 347                 return __xfrm6_dst_hash(addr);
 348         }
 349         return 0;
 350 }
 351
 352 static __inline__
 353 unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
 354 {
 355         unsigned h;
 356         h = ntohl(addr->a4^spi^proto);
 357         h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
 358         return h;
 359 }
 360
 361 static __inline__
 362 unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
 363 {
 364         unsigned h;
 365         h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
 366         h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
 367         return h;
 368 }
 369
 370 static __inline__
 371 unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
 372 {
 373         switch (family) {
 374         case AF_INET:
 375                 return __xfrm4_spi_hash(addr, spi, proto);
 376         case AF_INET6:
 377                 return __xfrm6_spi_hash(addr, spi, proto);
 378         }
 379         return 0;       /*XXX*/
 380 }
 381
 382 extern void __xfrm_state_destroy(struct xfrm_state *);
 383
 384 static inline void xfrm_state_put(struct xfrm_state *x)
 385 {
 386         if (atomic_dec_and_test(&x->refcnt))
 387                 __xfrm_state_destroy(x);
 388 }
 389
 390 static inline void xfrm_state_hold(struct xfrm_state *x)
 391 {
 392         atomic_inc(&x->refcnt);
 393 }
 394
 395 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
 396 {
 397         __u32 *a1 = token1;
 398         __u32 *a2 = token2;
 399         int pdw;
 400         int pbi;
 401
 402         pdw = prefixlen >> 5;     /* num of whole __u32 in prefix */
 403         pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
 404
 405         if (pdw)
 406                 if (memcmp(a1, a2, pdw << 2))
 407                         return 0;
 408
 409         if (pbi) {
 410                 __u32 mask;
 411
 412                 mask = htonl((0xffffffff) << (32 - pbi));
 413
 414                 if ((a1[pdw] ^ a2[pdw]) & mask)
 415                         return 0;
 416         }
 417
 418         return 1;
 419 }
 420
 421 static __inline__
 422 u16 xfrm_flowi_sport(struct flowi *fl)
 423 {
 424         u16 port;
 425         switch(fl->proto) {
 426         case IPPROTO_TCP:
 427         case IPPROTO_UDP:
 428         case IPPROTO_SCTP:
 429                 port = fl->fl_ip_sport;
 430                 break;
 431         case IPPROTO_ICMP:
 432         case IPPROTO_ICMPV6:
 433                 port = htons(fl->fl_icmp_type);
 434                 break;
 435         default:
 436                 port = 0;       /*XXX*/
 437         }
 438         return port;
 439 }
 440
 441 static __inline__
 442 u16 xfrm_flowi_dport(struct flowi *fl)
 443 {
 444         u16 port;
 445         switch(fl->proto) {
 446         case IPPROTO_TCP:
 447         case IPPROTO_UDP:
 448         case IPPROTO_SCTP:
 449                 port = fl->fl_ip_dport;
 450                 break;
 451         case IPPROTO_ICMP:
 452         case IPPROTO_ICMPV6:
 453                 port = htons(fl->fl_icmp_code);
 454                 break;
 455         default:
 456                 port = 0;       /*XXX*/
 457         }
 458         return port;
 459 }
 460
 461 static inline int
 462 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
 463 {
 464         return  addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
 465                 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
 466                 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
 467                 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
 468                 (fl->proto == sel->proto || !sel->proto) &&
 469                 (fl->oif == sel->ifindex || !sel->ifindex);
 470 }
 471
 472 static inline int
 473 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
 474 {
 475         return  addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
 476                 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
 477                 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
 478                 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
 479                 (fl->proto == sel->proto || !sel->proto) &&
 480                 (fl->oif == sel->ifindex || !sel->ifindex);
 481 }
 482
 483 static inline int
 484 xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
 485                     unsigned short family)
 486 {
 487         switch (family) {
 488         case AF_INET:
 489                 return __xfrm4_selector_match(sel, fl);
 490         case AF_INET6:
 491                 return __xfrm6_selector_match(sel, fl);
 492         }
 493         return 0;
 494 }
 495
 496 /* A struct encoding bundle of transformations to apply to some set of flow.
 497  *
 498  * dst->child points to the next element of bundle.
 499  * dst->xfrm  points to an instanse of transformer.
 500  *
 501  * Due to unfortunate limitations of current routing cache, which we
 502  * have no time to fix, it mirrors struct rtable and bound to the same
 503  * routing key, including saddr,daddr. However, we can have many of
 504  * bundles differing by session id. All the bundles grow from a parent
 505  * policy rule.
 506  */
 507 struct xfrm_dst
 508 {
 509         union {
 510                 struct xfrm_dst         *next;
 511                 struct dst_entry        dst;
 512                 struct rtable           rt;
 513                 struct rt6_info         rt6;
 514         } u;
 515         struct dst_entry *route;
 516         u32 route_mtu_cached;
 517         u32 child_mtu_cached;
 518 };
 519
 520 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
 521 {
 522         dst_release(xdst->route);
 523         if (likely(xdst->u.dst.xfrm))
 524                 xfrm_state_put(xdst->u.dst.xfrm);
 525 }
 526
 527 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
 528
 529 /* Decapsulation state, used by the input to store data during
 530  * decapsulation procedure, to be used later (during the policy
 531  * check
 532  */
 533 struct xfrm_decap_state {
 534         char    decap_data[20];
 535         __u16   decap_type;
 536 };
 537
 538 struct sec_decap_state {
 539         struct xfrm_state       *xvec;
 540         struct xfrm_decap_state decap;
 541 };
 542
 543 struct sec_path
 544 {
 545         atomic_t                refcnt;
 546         int                     len;
 547         struct sec_decap_state  x[XFRM_MAX_DEPTH];
 548 };
 549
 550 static inline struct sec_path *
 551 secpath_get(struct sec_path *sp)
 552 {
 553         if (sp)
 554                 atomic_inc(&sp->refcnt);
 555         return sp;
 556 }
 557
 558 extern void __secpath_destroy(struct sec_path *sp);
 559
 560 static inline void
 561 secpath_put(struct sec_path *sp)
 562 {
 563         if (sp && atomic_dec_and_test(&sp->refcnt))
 564                 __secpath_destroy(sp);
 565 }
 566
 567 extern struct sec_path *secpath_dup(struct sec_path *src);
 568
 569 static inline void
 570 secpath_reset(struct sk_buff *skb)
 571 {
 572 #ifdef CONFIG_XFRM
 573         secpath_put(skb->sp);
 574         skb->sp = NULL;
 575 #endif
 576 }
 577
 578 static inline int
 579 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 580 {
 581         return  (tmpl->saddr.a4 &&
 582                  tmpl->saddr.a4 != x->props.saddr.a4);
 583 }
 584
 585 static inline int
 586 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 587 {
 588         return  (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
 589                  ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
 590 }
 591
 592 static inline int
 593 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
 594 {
 595         switch (family) {
 596         case AF_INET:
 597                 return __xfrm4_state_addr_cmp(tmpl, x);
 598         case AF_INET6:
 599                 return __xfrm6_state_addr_cmp(tmpl, x);
 600         }
 601         return !0;
 602 }
 603
 604 #ifdef CONFIG_XFRM
 605
 606 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
 607
 608 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
 609 {
 610         if (sk && sk->sk_policy[XFRM_POLICY_IN])
 611                 return __xfrm_policy_check(sk, dir, skb, family);
 612
 613         return  (!xfrm_policy_list[dir] && !skb->sp) ||
 614                 (skb->dst->flags & DST_NOPOLICY) ||
 615                 __xfrm_policy_check(sk, dir, skb, family);
 616 }
 617
 618 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 619 {
 620         return xfrm_policy_check(sk, dir, skb, AF_INET);
 621 }
 622
 623 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 624 {
 625         return xfrm_policy_check(sk, dir, skb, AF_INET6);
 626 }
 627
 628
 629 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
 630
 631 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
 632 {
 633         return  !xfrm_policy_list[XFRM_POLICY_OUT] ||
 634                 (skb->dst->flags & DST_NOXFRM) ||
 635                 __xfrm_route_forward(skb, family);
 636 }
 637
 638 static inline int xfrm4_route_forward(struct sk_buff *skb)
 639 {
 640         return xfrm_route_forward(skb, AF_INET);
 641 }
 642
 643 static inline int xfrm6_route_forward(struct sk_buff *skb)
 644 {
 645         return xfrm_route_forward(skb, AF_INET6);
 646 }
 647
 648 extern int __xfrm_sk_clone_policy(struct sock *sk);
 649
 650 static inline int xfrm_sk_clone_policy(struct sock *sk)
 651 {
 652         if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
 653                 return __xfrm_sk_clone_policy(sk);
 654         return 0;
 655 }
 656
 657 extern void xfrm_policy_delete(struct xfrm_policy *pol, int dir);
 658
 659 static inline void xfrm_sk_free_policy(struct sock *sk)
 660 {
 661         if (unlikely(sk->sk_policy[0] != NULL)) {
 662                 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
 663                 sk->sk_policy[0] = NULL;
 664         }
 665         if (unlikely(sk->sk_policy[1] != NULL)) {
 666                 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
 667                 sk->sk_policy[1] = NULL;
 668         }
 669 }
 670
 671 #else
 672
 673 static inline void xfrm_sk_free_policy(struct sock *sk) {}
 674 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
 675 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
 676 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
 677 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 678 {
 679         return 1;
 680 }
 681 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 682 {
 683         return 1;
 684 }
 685 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
 686 {
 687         return 1;
 688 }
 689 #endif
 690
 691 static __inline__
 692 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
 693 {
 694         switch (family){
 695         case AF_INET:
 696                 return (xfrm_address_t *)&fl->fl4_dst;
 697         case AF_INET6:
 698                 return (xfrm_address_t *)&fl->fl6_dst;
 699         }
 700         return NULL;
 701 }
 702
 703 static __inline__
 704 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
 705 {
 706         switch (family){
 707         case AF_INET:
 708                 return (xfrm_address_t *)&fl->fl4_src;
 709         case AF_INET6:
 710                 return (xfrm_address_t *)&fl->fl6_src;
 711         }
 712         return NULL;
 713 }
 714
 715 static __inline__ int
 716 __xfrm4_state_addr_check(struct xfrm_state *x,
 717                          xfrm_address_t *daddr, xfrm_address_t *saddr)
 718 {
 719         if (daddr->a4 == x->id.daddr.a4 &&
 720             (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
 721                 return 1;
 722         return 0;
 723 }
 724
 725 static __inline__ int
 726 __xfrm6_state_addr_check(struct xfrm_state *x,
 727                          xfrm_address_t *daddr, xfrm_address_t *saddr)
 728 {
 729         if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
 730             (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
 731              ipv6_addr_any((struct in6_addr *)saddr) ||
 732              ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
 733                 return 1;
 734         return 0;
 735 }
 736
 737 static __inline__ int
 738 xfrm_state_addr_check(struct xfrm_state *x,
 739                       xfrm_address_t *daddr, xfrm_address_t *saddr,
 740                       unsigned short family)
 741 {
 742         switch (family) {
 743         case AF_INET:
 744                 return __xfrm4_state_addr_check(x, daddr, saddr);
 745         case AF_INET6:
 746                 return __xfrm6_state_addr_check(x, daddr, saddr);
 747         }
 748         return 0;
 749 }
 750
 751 static inline int xfrm_state_kern(struct xfrm_state *x)
 752 {
 753         return atomic_read(&x->tunnel_users);
 754 }
 755
 756 /*
 757  * xfrm algorithm information
 758  */
 759 struct xfrm_algo_auth_info {
 760         u16 icv_truncbits;
 761         u16 icv_fullbits;
 762 };
 763
 764 struct xfrm_algo_encr_info {
 765         u16 blockbits;
 766         u16 defkeybits;
 767 };
 768
 769 struct xfrm_algo_comp_info {
 770         u16 threshold;
 771 };
 772
 773 struct xfrm_algo_desc {
 774         char *name;
 775         u8 available:1;
 776         union {
 777                 struct xfrm_algo_auth_info auth;
 778                 struct xfrm_algo_encr_info encr;
 779                 struct xfrm_algo_comp_info comp;
 780         } uinfo;
 781         struct sadb_alg desc;
 782 };
 783
 784 /* XFRM tunnel handlers.  */
 785 struct xfrm_tunnel {
 786         int (*handler)(struct sk_buff *skb);
 787         void (*err_handler)(struct sk_buff *skb, void *info);
 788 };
 789
 790 struct xfrm6_tunnel {
 791         int (*handler)(struct sk_buff **pskb, unsigned int *nhoffp);
 792         void (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
 793                             int type, int code, int offset, __u32 info);
 794 };
 795
 796 extern void xfrm_init(void);
 797 extern void xfrm4_init(void);
 798 extern void xfrm6_init(void);
 799 extern void xfrm6_fini(void);
 800 extern void xfrm_state_init(void);
 801 extern void xfrm4_state_init(void);
 802 extern void xfrm4_state_fini(void);
 803 extern void xfrm6_state_init(void);
 804 extern void xfrm6_state_fini(void);
 805
 806 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
 807 extern struct xfrm_state *xfrm_state_alloc(void);
 808 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
 809                                           struct flowi *fl, struct xfrm_tmpl *tmpl,
 810                                           struct xfrm_policy *pol, int *err,
 811                                           unsigned short family);
 812 extern int xfrm_state_check_expire(struct xfrm_state *x);
 813 extern void xfrm_state_insert(struct xfrm_state *x);
 814 extern int xfrm_state_add(struct xfrm_state *x);
 815 extern int xfrm_state_update(struct xfrm_state *x);
 816 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
 817 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
 818 extern void xfrm_state_delete(struct xfrm_state *x);
 819 extern void xfrm_state_flush(u8 proto);
 820 extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
 821 extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
 822 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
 823 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
 824 extern int xfrm4_rcv(struct sk_buff *skb);
 825 extern int xfrm4_output(struct sk_buff *skb);
 826 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
 827 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
 828 extern int xfrm6_rcv_spi(struct sk_buff **pskb, unsigned int *nhoffp, u32 spi);
 829 extern int xfrm6_rcv(struct sk_buff **pskb, unsigned int *nhoffp);
 830 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
 831 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
 832 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
 833 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
 834 extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
 835 extern int xfrm6_output(struct sk_buff *skb);
 836
 837 #ifdef CONFIG_XFRM
 838 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
 839 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
 840 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
 841 #else
 842 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
 843 {
 844         return -ENOPROTOOPT;
 845 }
 846
 847 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
 848 {
 849         /* should not happen */
 850         kfree_skb(skb);
 851         return 0;
 852 }
 853 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
 854 {
 855         return -EINVAL;
 856 }
 857 #endif
 858
 859 struct xfrm_policy *xfrm_policy_alloc(int gfp);
 860 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
 861 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
 862 struct xfrm_policy *xfrm_policy_bysel(int dir, struct xfrm_selector *sel,
 863                                       int delete);
 864 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete);
 865 void xfrm_policy_flush(void);
 866 u32 xfrm_get_acqseq(void);
 867 void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
 868 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
 869                                   xfrm_address_t *daddr, xfrm_address_t *saddr,
 870                                   int create, unsigned short family);
 871 extern void xfrm_policy_flush(void);
 872 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
 873 extern int xfrm_flush_bundles(void);
 874 extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family);
 875 extern void xfrm_init_pmtu(struct dst_entry *dst);
 876
 877 extern wait_queue_head_t km_waitq;
 878 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
 879 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard);
 880
 881 extern void xfrm_input_init(void);
 882 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq);
 883
 884 extern void xfrm_probe_algs(void);
 885 extern int xfrm_count_auth_supported(void);
 886 extern int xfrm_count_enc_supported(void);
 887 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
 888 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
 889 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
 890 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
 891 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
 892 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
 893 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
 894 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
 895
 896 struct crypto_tfm;
 897 typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int);
 898
 899 extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm,
 900                          int offset, int len, icv_update_fn_t icv_update);
 901
 902 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
 903                                 int family)
 904 {
 905         switch (family) {
 906         default:
 907         case AF_INET:
 908                 return a->a4 - b->a4;
 909         case AF_INET6:
 910                 return ipv6_addr_cmp((struct in6_addr *)a,
 911                                      (struct in6_addr *)b);
 912         }
 913 }
 914
 915 #endif  /* _NET_XFRM_H */