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 /* events that could be sent by kernel */
 162 enum {
 163         XFRM_SAP_INVALID,
 164         XFRM_SAP_EXPIRED,
 165         XFRM_SAP_ADDED,
 166         XFRM_SAP_UPDATED,
 167         XFRM_SAP_DELETED,
 168         XFRM_SAP_FLUSHED,
 169         __XFRM_SAP_MAX
 170 };
 171 #define XFRM_SAP_MAX (__XFRM_SAP_MAX - 1)
 172
 173 /* callback structure passed from either netlink or pfkey */
 174 struct km_event
 175 {
 176         u32     data;
 177         u32     seq;
 178         u32     pid;
 179         u32     event;
 180 };
 181
 182 struct xfrm_type;
 183 struct xfrm_dst;
 184 struct xfrm_policy_afinfo {
 185         unsigned short          family;
 186         rwlock_t                lock;
 187         struct xfrm_type_map    *type_map;
 188         struct dst_ops          *dst_ops;
 189         void                    (*garbage_collect)(void);
 190         int                     (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
 191         struct dst_entry        *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
 192         int                     (*bundle_create)(struct xfrm_policy *policy,
 193                                                  struct xfrm_state **xfrm,
 194                                                  int nx,
 195                                                  struct flowi *fl,
 196                                                  struct dst_entry **dst_p);
 197         void                    (*decode_session)(struct sk_buff *skb,
 198                                                   struct flowi *fl);
 199 };
 200
 201 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
 202 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
 203 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
 204 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
 205
 206 #define XFRM_ACQ_EXPIRES        30
 207
 208 struct xfrm_tmpl;
 209 struct xfrm_state_afinfo {
 210         unsigned short          family;
 211         rwlock_t                lock;
 212         struct list_head        *state_bydst;
 213         struct list_head        *state_byspi;
 214         void                    (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
 215                                                 struct xfrm_tmpl *tmpl,
 216                                                 xfrm_address_t *daddr, xfrm_address_t *saddr);
 217         struct xfrm_state       *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto);
 218         struct xfrm_state       *(*find_acq)(u8 mode, u32 reqid, u8 proto,
 219                                              xfrm_address_t *daddr, xfrm_address_t *saddr,
 220                                              int create);
 221 };
 222
 223 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
 224 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
 225
 226 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
 227
 228 struct xfrm_decap_state;
 229 struct xfrm_type
 230 {
 231         char                    *description;
 232         struct module           *owner;
 233         __u8                    proto;
 234
 235         int                     (*init_state)(struct xfrm_state *x, void *args);
 236         void                    (*destructor)(struct xfrm_state *);
 237         int                     (*input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
 238         int                     (*post_input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
 239         int                     (*output)(struct xfrm_state *, struct sk_buff *pskb);
 240         /* Estimate maximal size of result of transformation of a dgram */
 241         u32                     (*get_max_size)(struct xfrm_state *, int size);
 242 };
 243
 244 struct xfrm_type_map {
 245         rwlock_t                lock;
 246         struct xfrm_type        *map[256];
 247 };
 248
 249 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
 250 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
 251 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
 252 extern void xfrm_put_type(struct xfrm_type *type);
 253
 254 struct xfrm_tmpl
 255 {
 256 /* id in template is interpreted as:
 257  * daddr - destination of tunnel, may be zero for transport mode.
 258  * spi   - zero to acquire spi. Not zero if spi is static, then
 259  *         daddr must be fixed too.
 260  * proto - AH/ESP/IPCOMP
 261  */
 262         struct xfrm_id          id;
 263
 264 /* Source address of tunnel. Ignored, if it is not a tunnel. */
 265         xfrm_address_t          saddr;
 266
 267         __u32                   reqid;
 268
 269 /* Mode: transport/tunnel */
 270         __u8                    mode;
 271
 272 /* Sharing mode: unique, this session only, this user only etc. */
 273         __u8                    share;
 274
 275 /* May skip this transfomration if no SA is found */
 276         __u8                    optional;
 277
 278 /* Bit mask of algos allowed for acquisition */
 279         __u32                   aalgos;
 280         __u32                   ealgos;
 281         __u32                   calgos;
 282 };
 283
 284 #define XFRM_MAX_DEPTH          4
 285
 286 struct xfrm_policy
 287 {
 288         struct xfrm_policy      *next;
 289         struct list_head        list;
 290
 291         /* This lock only affects elements except for entry. */
 292         rwlock_t                lock;
 293         atomic_t                refcnt;
 294         struct timer_list       timer;
 295
 296         u32                     priority;
 297         u32                     index;
 298         struct xfrm_selector    selector;
 299         struct xfrm_lifetime_cfg lft;
 300         struct xfrm_lifetime_cur curlft;
 301         struct dst_entry       *bundles;
 302         __u16                   family;
 303         __u8                    action;
 304         __u8                    flags;
 305         __u8                    dead;
 306         __u8                    xfrm_nr;
 307         struct xfrm_tmpl        xfrm_vec[XFRM_MAX_DEPTH];
 308 };
 309
 310 #define XFRM_KM_TIMEOUT         30
 311
 312 struct xfrm_mgr
 313 {
 314         struct list_head        list;
 315         char                    *id;
 316         int                     (*notify)(struct xfrm_state *x, struct km_event *c);
 317         int                     (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
 318         struct xfrm_policy      *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir);
 319         int                     (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
 320         int                     (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
 321 };
 322
 323 extern int xfrm_register_km(struct xfrm_mgr *km);
 324 extern int xfrm_unregister_km(struct xfrm_mgr *km);
 325
 326
 327 extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
 328
 329 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
 330 {
 331         if (likely(policy != NULL))
 332                 atomic_inc(&policy->refcnt);
 333 }
 334
 335 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
 336
 337 static inline void xfrm_pol_put(struct xfrm_policy *policy)
 338 {
 339         if (atomic_dec_and_test(&policy->refcnt))
 340                 __xfrm_policy_destroy(policy);
 341 }
 342
 343 #define XFRM_DST_HSIZE          1024
 344
 345 static __inline__
 346 unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
 347 {
 348         unsigned h;
 349         h = ntohl(addr->a4);
 350         h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
 351         return h;
 352 }
 353
 354 static __inline__
 355 unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
 356 {
 357         unsigned h;
 358         h = ntohl(addr->a6[2]^addr->a6[3]);
 359         h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
 360         return h;
 361 }
 362
 363 static __inline__
 364 unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
 365 {
 366         switch (family) {
 367         case AF_INET:
 368                 return __xfrm4_dst_hash(addr);
 369         case AF_INET6:
 370                 return __xfrm6_dst_hash(addr);
 371         }
 372         return 0;
 373 }
 374
 375 static __inline__
 376 unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
 377 {
 378         unsigned h;
 379         h = ntohl(addr->a4^spi^proto);
 380         h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
 381         return h;
 382 }
 383
 384 static __inline__
 385 unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
 386 {
 387         unsigned h;
 388         h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
 389         h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
 390         return h;
 391 }
 392
 393 static __inline__
 394 unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
 395 {
 396         switch (family) {
 397         case AF_INET:
 398                 return __xfrm4_spi_hash(addr, spi, proto);
 399         case AF_INET6:
 400                 return __xfrm6_spi_hash(addr, spi, proto);
 401         }
 402         return 0;       /*XXX*/
 403 }
 404
 405 extern void __xfrm_state_destroy(struct xfrm_state *);
 406
 407 static inline void xfrm_state_put(struct xfrm_state *x)
 408 {
 409         if (atomic_dec_and_test(&x->refcnt))
 410                 __xfrm_state_destroy(x);
 411 }
 412
 413 static inline void xfrm_state_hold(struct xfrm_state *x)
 414 {
 415         atomic_inc(&x->refcnt);
 416 }
 417
 418 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
 419 {
 420         __u32 *a1 = token1;
 421         __u32 *a2 = token2;
 422         int pdw;
 423         int pbi;
 424
 425         pdw = prefixlen >> 5;     /* num of whole __u32 in prefix */
 426         pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
 427
 428         if (pdw)
 429                 if (memcmp(a1, a2, pdw << 2))
 430                         return 0;
 431
 432         if (pbi) {
 433                 __u32 mask;
 434
 435                 mask = htonl((0xffffffff) << (32 - pbi));
 436
 437                 if ((a1[pdw] ^ a2[pdw]) & mask)
 438                         return 0;
 439         }
 440
 441         return 1;
 442 }
 443
 444 static __inline__
 445 u16 xfrm_flowi_sport(struct flowi *fl)
 446 {
 447         u16 port;
 448         switch(fl->proto) {
 449         case IPPROTO_TCP:
 450         case IPPROTO_UDP:
 451         case IPPROTO_SCTP:
 452                 port = fl->fl_ip_sport;
 453                 break;
 454         case IPPROTO_ICMP:
 455         case IPPROTO_ICMPV6:
 456                 port = htons(fl->fl_icmp_type);
 457                 break;
 458         default:
 459                 port = 0;       /*XXX*/
 460         }
 461         return port;
 462 }
 463
 464 static __inline__
 465 u16 xfrm_flowi_dport(struct flowi *fl)
 466 {
 467         u16 port;
 468         switch(fl->proto) {
 469         case IPPROTO_TCP:
 470         case IPPROTO_UDP:
 471         case IPPROTO_SCTP:
 472                 port = fl->fl_ip_dport;
 473                 break;
 474         case IPPROTO_ICMP:
 475         case IPPROTO_ICMPV6:
 476                 port = htons(fl->fl_icmp_code);
 477                 break;
 478         default:
 479                 port = 0;       /*XXX*/
 480         }
 481         return port;
 482 }
 483
 484 static inline int
 485 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
 486 {
 487         return  addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
 488                 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
 489                 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
 490                 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
 491                 (fl->proto == sel->proto || !sel->proto) &&
 492                 (fl->oif == sel->ifindex || !sel->ifindex);
 493 }
 494
 495 static inline int
 496 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
 497 {
 498         return  addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
 499                 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
 500                 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
 501                 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
 502                 (fl->proto == sel->proto || !sel->proto) &&
 503                 (fl->oif == sel->ifindex || !sel->ifindex);
 504 }
 505
 506 static inline int
 507 xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
 508                     unsigned short family)
 509 {
 510         switch (family) {
 511         case AF_INET:
 512                 return __xfrm4_selector_match(sel, fl);
 513         case AF_INET6:
 514                 return __xfrm6_selector_match(sel, fl);
 515         }
 516         return 0;
 517 }
 518
 519 /* A struct encoding bundle of transformations to apply to some set of flow.
 520  *
 521  * dst->child points to the next element of bundle.
 522  * dst->xfrm  points to an instanse of transformer.
 523  *
 524  * Due to unfortunate limitations of current routing cache, which we
 525  * have no time to fix, it mirrors struct rtable and bound to the same
 526  * routing key, including saddr,daddr. However, we can have many of
 527  * bundles differing by session id. All the bundles grow from a parent
 528  * policy rule.
 529  */
 530 struct xfrm_dst
 531 {
 532         union {
 533                 struct xfrm_dst         *next;
 534                 struct dst_entry        dst;
 535                 struct rtable           rt;
 536                 struct rt6_info         rt6;
 537         } u;
 538         struct dst_entry *route;
 539         u32 route_mtu_cached;
 540         u32 child_mtu_cached;
 541         u32 route_cookie;
 542         u32 path_cookie;
 543 };
 544
 545 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
 546 {
 547         dst_release(xdst->route);
 548         if (likely(xdst->u.dst.xfrm))
 549                 xfrm_state_put(xdst->u.dst.xfrm);
 550 }
 551
 552 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
 553
 554 /* Decapsulation state, used by the input to store data during
 555  * decapsulation procedure, to be used later (during the policy
 556  * check
 557  */
 558 struct xfrm_decap_state {
 559         char    decap_data[20];
 560         __u16   decap_type;
 561 };
 562
 563 struct sec_decap_state {
 564         struct xfrm_state       *xvec;
 565         struct xfrm_decap_state decap;
 566 };
 567
 568 struct sec_path
 569 {
 570         atomic_t                refcnt;
 571         int                     len;
 572         struct sec_decap_state  x[XFRM_MAX_DEPTH];
 573 };
 574
 575 static inline struct sec_path *
 576 secpath_get(struct sec_path *sp)
 577 {
 578         if (sp)
 579                 atomic_inc(&sp->refcnt);
 580         return sp;
 581 }
 582
 583 extern void __secpath_destroy(struct sec_path *sp);
 584
 585 static inline void
 586 secpath_put(struct sec_path *sp)
 587 {
 588         if (sp && atomic_dec_and_test(&sp->refcnt))
 589                 __secpath_destroy(sp);
 590 }
 591
 592 extern struct sec_path *secpath_dup(struct sec_path *src);
 593
 594 static inline void
 595 secpath_reset(struct sk_buff *skb)
 596 {
 597 #ifdef CONFIG_XFRM
 598         secpath_put(skb->sp);
 599         skb->sp = NULL;
 600 #endif
 601 }
 602
 603 static inline int
 604 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 605 {
 606         return  (tmpl->saddr.a4 &&
 607                  tmpl->saddr.a4 != x->props.saddr.a4);
 608 }
 609
 610 static inline int
 611 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 612 {
 613         return  (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
 614                  ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
 615 }
 616
 617 static inline int
 618 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
 619 {
 620         switch (family) {
 621         case AF_INET:
 622                 return __xfrm4_state_addr_cmp(tmpl, x);
 623         case AF_INET6:
 624                 return __xfrm6_state_addr_cmp(tmpl, x);
 625         }
 626         return !0;
 627 }
 628
 629 #ifdef CONFIG_XFRM
 630
 631 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
 632
 633 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
 634 {
 635         if (sk && sk->sk_policy[XFRM_POLICY_IN])
 636                 return __xfrm_policy_check(sk, dir, skb, family);
 637
 638         return  (!xfrm_policy_list[dir] && !skb->sp) ||
 639                 (skb->dst->flags & DST_NOPOLICY) ||
 640                 __xfrm_policy_check(sk, dir, skb, family);
 641 }
 642
 643 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 644 {
 645         return xfrm_policy_check(sk, dir, skb, AF_INET);
 646 }
 647
 648 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 649 {
 650         return xfrm_policy_check(sk, dir, skb, AF_INET6);
 651 }
 652
 653
 654 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
 655
 656 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
 657 {
 658         return  !xfrm_policy_list[XFRM_POLICY_OUT] ||
 659                 (skb->dst->flags & DST_NOXFRM) ||
 660                 __xfrm_route_forward(skb, family);
 661 }
 662
 663 static inline int xfrm4_route_forward(struct sk_buff *skb)
 664 {
 665         return xfrm_route_forward(skb, AF_INET);
 666 }
 667
 668 static inline int xfrm6_route_forward(struct sk_buff *skb)
 669 {
 670         return xfrm_route_forward(skb, AF_INET6);
 671 }
 672
 673 extern int __xfrm_sk_clone_policy(struct sock *sk);
 674
 675 static inline int xfrm_sk_clone_policy(struct sock *sk)
 676 {
 677         if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
 678                 return __xfrm_sk_clone_policy(sk);
 679         return 0;
 680 }
 681
 682 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
 683
 684 static inline void xfrm_sk_free_policy(struct sock *sk)
 685 {
 686         if (unlikely(sk->sk_policy[0] != NULL)) {
 687                 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
 688                 sk->sk_policy[0] = NULL;
 689         }
 690         if (unlikely(sk->sk_policy[1] != NULL)) {
 691                 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
 692                 sk->sk_policy[1] = NULL;
 693         }
 694 }
 695
 696 #else
 697
 698 static inline void xfrm_sk_free_policy(struct sock *sk) {}
 699 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
 700 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
 701 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
 702 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 703 {
 704         return 1;
 705 }
 706 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
 707 {
 708         return 1;
 709 }
 710 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
 711 {
 712         return 1;
 713 }
 714 #endif
 715
 716 static __inline__
 717 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
 718 {
 719         switch (family){
 720         case AF_INET:
 721                 return (xfrm_address_t *)&fl->fl4_dst;
 722         case AF_INET6:
 723                 return (xfrm_address_t *)&fl->fl6_dst;
 724         }
 725         return NULL;
 726 }
 727
 728 static __inline__
 729 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
 730 {
 731         switch (family){
 732         case AF_INET:
 733                 return (xfrm_address_t *)&fl->fl4_src;
 734         case AF_INET6:
 735                 return (xfrm_address_t *)&fl->fl6_src;
 736         }
 737         return NULL;
 738 }
 739
 740 static __inline__ int
 741 __xfrm4_state_addr_check(struct xfrm_state *x,
 742                          xfrm_address_t *daddr, xfrm_address_t *saddr)
 743 {
 744         if (daddr->a4 == x->id.daddr.a4 &&
 745             (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
 746                 return 1;
 747         return 0;
 748 }
 749
 750 static __inline__ int
 751 __xfrm6_state_addr_check(struct xfrm_state *x,
 752                          xfrm_address_t *daddr, xfrm_address_t *saddr)
 753 {
 754         if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
 755             (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
 756              ipv6_addr_any((struct in6_addr *)saddr) ||
 757              ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
 758                 return 1;
 759         return 0;
 760 }
 761
 762 static __inline__ int
 763 xfrm_state_addr_check(struct xfrm_state *x,
 764                       xfrm_address_t *daddr, xfrm_address_t *saddr,
 765                       unsigned short family)
 766 {
 767         switch (family) {
 768         case AF_INET:
 769                 return __xfrm4_state_addr_check(x, daddr, saddr);
 770         case AF_INET6:
 771                 return __xfrm6_state_addr_check(x, daddr, saddr);
 772         }
 773         return 0;
 774 }
 775
 776 static inline int xfrm_state_kern(struct xfrm_state *x)
 777 {
 778         return atomic_read(&x->tunnel_users);
 779 }
 780
 781 /*
 782  * xfrm algorithm information
 783  */
 784 struct xfrm_algo_auth_info {
 785         u16 icv_truncbits;
 786         u16 icv_fullbits;
 787 };
 788
 789 struct xfrm_algo_encr_info {
 790         u16 blockbits;
 791         u16 defkeybits;
 792 };
 793
 794 struct xfrm_algo_comp_info {
 795         u16 threshold;
 796 };
 797
 798 struct xfrm_algo_desc {
 799         char *name;
 800         u8 available:1;
 801         union {
 802                 struct xfrm_algo_auth_info auth;
 803                 struct xfrm_algo_encr_info encr;
 804                 struct xfrm_algo_comp_info comp;
 805         } uinfo;
 806         struct sadb_alg desc;
 807 };
 808
 809 /* XFRM tunnel handlers.  */
 810 struct xfrm_tunnel {
 811         int (*handler)(struct sk_buff *skb);
 812         void (*err_handler)(struct sk_buff *skb, void *info);
 813 };
 814
 815 struct xfrm6_tunnel {
 816         int (*handler)(struct sk_buff **pskb, unsigned int *nhoffp);
 817         void (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
 818                             int type, int code, int offset, __u32 info);
 819 };
 820
 821 extern void xfrm_init(void);
 822 extern void xfrm4_init(void);
 823 extern void xfrm6_init(void);
 824 extern void xfrm6_fini(void);
 825 extern void xfrm_state_init(void);
 826 extern void xfrm4_state_init(void);
 827 extern void xfrm4_state_fini(void);
 828 extern void xfrm6_state_init(void);
 829 extern void xfrm6_state_fini(void);
 830
 831 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
 832 extern struct xfrm_state *xfrm_state_alloc(void);
 833 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
 834                                           struct flowi *fl, struct xfrm_tmpl *tmpl,
 835                                           struct xfrm_policy *pol, int *err,
 836                                           unsigned short family);
 837 extern int xfrm_state_check_expire(struct xfrm_state *x);
 838 extern void xfrm_state_insert(struct xfrm_state *x);
 839 extern int xfrm_state_add(struct xfrm_state *x);
 840 extern int xfrm_state_update(struct xfrm_state *x);
 841 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
 842 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
 843 extern int xfrm_state_delete(struct xfrm_state *x);
 844 extern void xfrm_state_flush(u8 proto);
 845 extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
 846 extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
 847 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
 848 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
 849 extern int xfrm4_rcv(struct sk_buff *skb);
 850 extern int xfrm4_output(struct sk_buff *skb);
 851 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
 852 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
 853 extern int xfrm6_rcv_spi(struct sk_buff **pskb, unsigned int *nhoffp, u32 spi);
 854 extern int xfrm6_rcv(struct sk_buff **pskb, unsigned int *nhoffp);
 855 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
 856 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
 857 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
 858 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
 859 extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
 860 extern int xfrm6_output(struct sk_buff *skb);
 861
 862 #ifdef CONFIG_XFRM
 863 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
 864 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
 865 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
 866 #else
 867 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
 868 {
 869         return -ENOPROTOOPT;
 870 }
 871
 872 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
 873 {
 874         /* should not happen */
 875         kfree_skb(skb);
 876         return 0;
 877 }
 878 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
 879 {
 880         return -EINVAL;
 881 }
 882 #endif
 883
 884 struct xfrm_policy *xfrm_policy_alloc(int gfp);
 885 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
 886 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
 887 struct xfrm_policy *xfrm_policy_bysel(int dir, struct xfrm_selector *sel,
 888                                       int delete);
 889 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete);
 890 void xfrm_policy_flush(void);
 891 u32 xfrm_get_acqseq(void);
 892 void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
 893 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
 894                                   xfrm_address_t *daddr, xfrm_address_t *saddr,
 895                                   int create, unsigned short family);
 896 extern void xfrm_policy_flush(void);
 897 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
 898 extern int xfrm_flush_bundles(void);
 899 extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family);
 900 extern void xfrm_init_pmtu(struct dst_entry *dst);
 901
 902 extern wait_queue_head_t km_waitq;
 903 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
 904 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard);
 905
 906 extern void xfrm_input_init(void);
 907 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq);
 908
 909 extern void xfrm_probe_algs(void);
 910 extern int xfrm_count_auth_supported(void);
 911 extern int xfrm_count_enc_supported(void);
 912 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
 913 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
 914 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
 915 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
 916 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
 917 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
 918 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
 919 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
 920
 921 struct crypto_tfm;
 922 typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int);
 923
 924 extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm,
 925                          int offset, int len, icv_update_fn_t icv_update);
 926
 927 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
 928                                 int family)
 929 {
 930         switch (family) {
 931         default:
 932         case AF_INET:
 933                 return a->a4 - b->a4;
 934         case AF_INET6:
 935                 return ipv6_addr_cmp((struct in6_addr *)a,
 936                                      (struct in6_addr *)b);
 937         }
 938 }
 939
 940 #endif  /* _NET_XFRM_H */