1 #ifndef _NET_XFRM_H 2 #define _NET_XFRM_H 3 4 #include <linux/compiler.h> 5 #include <linux/in.h> 6 #include <linux/xfrm.h> 7 #include <linux/spinlock.h> 8 #include <linux/list.h> 9 #include <linux/skbuff.h> 10 #include <linux/socket.h> 11 #include <linux/crypto.h> 12 #include <linux/pfkeyv2.h> 13 #include <linux/in6.h> 14 #include <linux/mutex.h> 15 16 #include <net/sock.h> 17 #include <net/dst.h> 18 #include <net/route.h> 19 #include <net/ipv6.h> 20 #include <net/ip6_fib.h> 21 22 #define XFRM_ALIGN8(len) (((len) + 7) & ~7) 23 24 extern struct sock *xfrm_nl; 25 extern u32 sysctl_xfrm_aevent_etime; 26 extern u32 sysctl_xfrm_aevent_rseqth; 27 28 extern struct mutex xfrm_cfg_mutex; 29 30 /* Organization of SPD aka "XFRM rules" 31 ------------------------------------ 32 33 Basic objects: 34 - policy rule, struct xfrm_policy (=SPD entry) 35 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) 36 - instance of a transformer, struct xfrm_state (=SA) 37 - template to clone xfrm_state, struct xfrm_tmpl 38 39 SPD is plain linear list of xfrm_policy rules, ordered by priority. 40 (To be compatible with existing pfkeyv2 implementations, 41 many rules with priority of 0x7fffffff are allowed to exist and 42 such rules are ordered in an unpredictable way, thanks to bsd folks.) 43 44 Lookup is plain linear search until the first match with selector. 45 46 If "action" is "block", then we prohibit the flow, otherwise: 47 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, 48 policy entry has list of up to XFRM_MAX_DEPTH transformations, 49 described by templates xfrm_tmpl. Each template is resolved 50 to a complete xfrm_state (see below) and we pack bundle of transformations 51 to a dst_entry returned to requestor. 52 53 dst -. xfrm .-> xfrm_state #1 54 |---. child .-> dst -. xfrm .-> xfrm_state #2 55 |---. child .-> dst -. xfrm .-> xfrm_state #3 56 |---. child .-> NULL 57 58 Bundles are cached at xrfm_policy struct (field ->bundles). 59 60 61 Resolution of xrfm_tmpl 62 ----------------------- 63 Template contains: 64 1. ->mode Mode: transport or tunnel 65 2. ->id.proto Protocol: AH/ESP/IPCOMP 66 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. 67 Q: allow to resolve security gateway? 68 4. ->id.spi If not zero, static SPI. 69 5. ->saddr Local tunnel endpoint, ignored for transport mode. 70 6. ->algos List of allowed algos. Plain bitmask now. 71 Q: ealgos, aalgos, calgos. What a mess... 72 7. ->share Sharing mode. 73 Q: how to implement private sharing mode? To add struct sock* to 74 flow id? 75 76 Having this template we search through SAD searching for entries 77 with appropriate mode/proto/algo, permitted by selector. 78 If no appropriate entry found, it is requested from key manager. 79 80 PROBLEMS: 81 Q: How to find all the bundles referring to a physical path for 82 PMTU discovery? Seems, dst should contain list of all parents... 83 and enter to infinite locking hierarchy disaster. 84 No! It is easier, we will not search for them, let them find us. 85 We add genid to each dst plus pointer to genid of raw IP route, 86 pmtu disc will update pmtu on raw IP route and increase its genid. 87 dst_check() will see this for top level and trigger resyncing 88 metrics. Plus, it will be made via sk->sk_dst_cache. Solved. 89 */ 90 91 /* Full description of state of transformer. */ 92 struct xfrm_state 93 { 94 /* Note: bydst is re-used during gc */ 95 struct list_head bydst; 96 struct list_head byspi; 97 98 atomic_t refcnt; 99 spinlock_t lock; 100 101 struct xfrm_id id; 102 struct xfrm_selector sel; 103 104 /* Key manger bits */ 105 struct { 106 u8 state; 107 u8 dying; 108 u32 seq; 109 } km; 110 111 /* Parameters of this state. */ 112 struct { 113 u32 reqid; 114 u8 mode; 115 u8 replay_window; 116 u8 aalgo, ealgo, calgo; 117 u8 flags; 118 u16 family; 119 xfrm_address_t saddr; 120 int header_len; 121 int trailer_len; 122 } props; 123 124 struct xfrm_lifetime_cfg lft; 125 126 /* Data for transformer */ 127 struct xfrm_algo *aalg; 128 struct xfrm_algo *ealg; 129 struct xfrm_algo *calg; 130 131 /* Data for encapsulator */ 132 struct xfrm_encap_tmpl *encap; 133 134 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 135 struct xfrm_state *tunnel; 136 137 /* If a tunnel, number of users + 1 */ 138 atomic_t tunnel_users; 139 140 /* State for replay detection */ 141 struct xfrm_replay_state replay; 142 143 /* Replay detection state at the time we sent the last notification */ 144 struct xfrm_replay_state preplay; 145 146 /* internal flag that only holds state for delayed aevent at the 147 * moment 148 */ 149 u32 xflags; 150 151 /* Replay detection notification settings */ 152 u32 replay_maxage; 153 u32 replay_maxdiff; 154 155 /* Replay detection notification timer */ 156 struct timer_list rtimer; 157 158 /* Statistics */ 159 struct xfrm_stats stats; 160 161 struct xfrm_lifetime_cur curlft; 162 struct timer_list timer; 163 164 /* Reference to data common to all the instances of this 165 * transformer. */ 166 struct xfrm_type *type; 167 168 /* Security context */ 169 struct xfrm_sec_ctx *security; 170 171 /* Private data of this transformer, format is opaque, 172 * interpreted by xfrm_type methods. */ 173 void *data; 174 }; 175 176 /* xflags - make enum if more show up */ 177 #define XFRM_TIME_DEFER 1 178 179 enum { 180 XFRM_STATE_VOID, 181 XFRM_STATE_ACQ, 182 XFRM_STATE_VALID, 183 XFRM_STATE_ERROR, 184 XFRM_STATE_EXPIRED, 185 XFRM_STATE_DEAD 186 }; 187 188 /* callback structure passed from either netlink or pfkey */ 189 struct km_event 190 { 191 union { 192 u32 hard; 193 u32 proto; 194 u32 byid; 195 u32 aevent; 196 } data; 197 198 u32 seq; 199 u32 pid; 200 u32 event; 201 }; 202 203 struct xfrm_type; 204 struct xfrm_dst; 205 struct xfrm_policy_afinfo { 206 unsigned short family; 207 rwlock_t lock; 208 struct xfrm_type_map *type_map; 209 struct dst_ops *dst_ops; 210 void (*garbage_collect)(void); 211 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl); 212 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy); 213 int (*bundle_create)(struct xfrm_policy *policy, 214 struct xfrm_state **xfrm, 215 int nx, 216 struct flowi *fl, 217 struct dst_entry **dst_p); 218 void (*decode_session)(struct sk_buff *skb, 219 struct flowi *fl); 220 }; 221 222 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); 223 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); 224 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c); 225 extern void km_state_notify(struct xfrm_state *x, struct km_event *c); 226 #define XFRM_ACQ_EXPIRES 30 227 228 struct xfrm_tmpl; 229 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); 230 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid); 231 extern int __xfrm_state_delete(struct xfrm_state *x); 232 233 struct xfrm_state_afinfo { 234 unsigned short family; 235 rwlock_t lock; 236 struct list_head *state_bydst; 237 struct list_head *state_byspi; 238 int (*init_flags)(struct xfrm_state *x); 239 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl, 240 struct xfrm_tmpl *tmpl, 241 xfrm_address_t *daddr, xfrm_address_t *saddr); 242 struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto); 243 struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto, 244 xfrm_address_t *daddr, xfrm_address_t *saddr, 245 int create); 246 }; 247 248 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 249 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 250 251 extern void xfrm_state_delete_tunnel(struct xfrm_state *x); 252 253 struct xfrm_type 254 { 255 char *description; 256 struct module *owner; 257 __u8 proto; 258 259 int (*init_state)(struct xfrm_state *x); 260 void (*destructor)(struct xfrm_state *); 261 int (*input)(struct xfrm_state *, struct sk_buff *skb); 262 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 263 /* Estimate maximal size of result of transformation of a dgram */ 264 u32 (*get_max_size)(struct xfrm_state *, int size); 265 }; 266 267 struct xfrm_type_map { 268 rwlock_t lock; 269 struct xfrm_type *map[256]; 270 }; 271 272 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family); 273 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family); 274 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family); 275 extern void xfrm_put_type(struct xfrm_type *type); 276 277 struct xfrm_tmpl 278 { 279 /* id in template is interpreted as: 280 * daddr - destination of tunnel, may be zero for transport mode. 281 * spi - zero to acquire spi. Not zero if spi is static, then 282 * daddr must be fixed too. 283 * proto - AH/ESP/IPCOMP 284 */ 285 struct xfrm_id id; 286 287 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 288 xfrm_address_t saddr; 289 290 __u32 reqid; 291 292 /* Mode: transport/tunnel */ 293 __u8 mode; 294 295 /* Sharing mode: unique, this session only, this user only etc. */ 296 __u8 share; 297 298 /* May skip this transfomration if no SA is found */ 299 __u8 optional; 300 301 /* Bit mask of algos allowed for acquisition */ 302 __u32 aalgos; 303 __u32 ealgos; 304 __u32 calgos; 305 }; 306 307 #define XFRM_MAX_DEPTH 4 308 309 struct xfrm_policy 310 { 311 struct xfrm_policy *next; 312 struct list_head list; 313 314 /* This lock only affects elements except for entry. */ 315 rwlock_t lock; 316 atomic_t refcnt; 317 struct timer_list timer; 318 319 u32 priority; 320 u32 index; 321 struct xfrm_selector selector; 322 struct xfrm_lifetime_cfg lft; 323 struct xfrm_lifetime_cur curlft; 324 struct dst_entry *bundles; 325 __u16 family; 326 __u8 action; 327 __u8 flags; 328 __u8 dead; 329 __u8 xfrm_nr; 330 struct xfrm_sec_ctx *security; 331 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 332 }; 333 334 #define XFRM_KM_TIMEOUT 30 335 /* which seqno */ 336 #define XFRM_REPLAY_SEQ 1 337 #define XFRM_REPLAY_OSEQ 2 338 #define XFRM_REPLAY_SEQ_MASK 3 339 /* what happened */ 340 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 341 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 342 343 /* default aevent timeout in units of 100ms */ 344 #define XFRM_AE_ETIME 10 345 /* Async Event timer multiplier */ 346 #define XFRM_AE_ETH_M 10 347 /* default seq threshold size */ 348 #define XFRM_AE_SEQT_SIZE 2 349 350 struct xfrm_mgr 351 { 352 struct list_head list; 353 char *id; 354 int (*notify)(struct xfrm_state *x, struct km_event *c); 355 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); 356 struct xfrm_policy *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir); 357 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport); 358 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c); 359 }; 360 361 extern int xfrm_register_km(struct xfrm_mgr *km); 362 extern int xfrm_unregister_km(struct xfrm_mgr *km); 363 364 365 extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2]; 366 367 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 368 { 369 if (likely(policy != NULL)) 370 atomic_inc(&policy->refcnt); 371 } 372 373 extern void __xfrm_policy_destroy(struct xfrm_policy *policy); 374 375 static inline void xfrm_pol_put(struct xfrm_policy *policy) 376 { 377 if (atomic_dec_and_test(&policy->refcnt)) 378 __xfrm_policy_destroy(policy); 379 } 380 381 #define XFRM_DST_HSIZE 1024 382 383 static __inline__ 384 unsigned __xfrm4_dst_hash(xfrm_address_t *addr) 385 { 386 unsigned h; 387 h = ntohl(addr->a4); 388 h = (h ^ (h>>16)) % XFRM_DST_HSIZE; 389 return h; 390 } 391 392 static __inline__ 393 unsigned __xfrm6_dst_hash(xfrm_address_t *addr) 394 { 395 unsigned h; 396 h = ntohl(addr->a6[2]^addr->a6[3]); 397 h = (h ^ (h>>16)) % XFRM_DST_HSIZE; 398 return h; 399 } 400 401 static __inline__ 402 unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family) 403 { 404 switch (family) { 405 case AF_INET: 406 return __xfrm4_dst_hash(addr); 407 case AF_INET6: 408 return __xfrm6_dst_hash(addr); 409 } 410 return 0; 411 } 412 413 static __inline__ 414 unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto) 415 { 416 unsigned h; 417 h = ntohl(addr->a4^spi^proto); 418 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE; 419 return h; 420 } 421 422 static __inline__ 423 unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto) 424 { 425 unsigned h; 426 h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto); 427 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE; 428 return h; 429 } 430 431 static __inline__ 432 unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family) 433 { 434 switch (family) { 435 case AF_INET: 436 return __xfrm4_spi_hash(addr, spi, proto); 437 case AF_INET6: 438 return __xfrm6_spi_hash(addr, spi, proto); 439 } 440 return 0; /*XXX*/ 441 } 442 443 extern void __xfrm_state_destroy(struct xfrm_state *); 444 445 static inline void __xfrm_state_put(struct xfrm_state *x) 446 { 447 atomic_dec(&x->refcnt); 448 } 449 450 static inline void xfrm_state_put(struct xfrm_state *x) 451 { 452 if (atomic_dec_and_test(&x->refcnt)) 453 __xfrm_state_destroy(x); 454 } 455 456 static inline void xfrm_state_hold(struct xfrm_state *x) 457 { 458 atomic_inc(&x->refcnt); 459 } 460 461 static __inline__ int addr_match(void *token1, void *token2, int prefixlen) 462 { 463 __u32 *a1 = token1; 464 __u32 *a2 = token2; 465 int pdw; 466 int pbi; 467 468 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */ 469 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 470 471 if (pdw) 472 if (memcmp(a1, a2, pdw << 2)) 473 return 0; 474 475 if (pbi) { 476 __u32 mask; 477 478 mask = htonl((0xffffffff) << (32 - pbi)); 479 480 if ((a1[pdw] ^ a2[pdw]) & mask) 481 return 0; 482 } 483 484 return 1; 485 } 486 487 static __inline__ 488 u16 xfrm_flowi_sport(struct flowi *fl) 489 { 490 u16 port; 491 switch(fl->proto) { 492 case IPPROTO_TCP: 493 case IPPROTO_UDP: 494 case IPPROTO_SCTP: 495 port = fl->fl_ip_sport; 496 break; 497 case IPPROTO_ICMP: 498 case IPPROTO_ICMPV6: 499 port = htons(fl->fl_icmp_type); 500 break; 501 default: 502 port = 0; /*XXX*/ 503 } 504 return port; 505 } 506 507 static __inline__ 508 u16 xfrm_flowi_dport(struct flowi *fl) 509 { 510 u16 port; 511 switch(fl->proto) { 512 case IPPROTO_TCP: 513 case IPPROTO_UDP: 514 case IPPROTO_SCTP: 515 port = fl->fl_ip_dport; 516 break; 517 case IPPROTO_ICMP: 518 case IPPROTO_ICMPV6: 519 port = htons(fl->fl_icmp_code); 520 break; 521 default: 522 port = 0; /*XXX*/ 523 } 524 return port; 525 } 526 527 static inline int 528 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) 529 { 530 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && 531 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && 532 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && 533 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && 534 (fl->proto == sel->proto || !sel->proto) && 535 (fl->oif == sel->ifindex || !sel->ifindex); 536 } 537 538 static inline int 539 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) 540 { 541 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && 542 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && 543 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && 544 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && 545 (fl->proto == sel->proto || !sel->proto) && 546 (fl->oif == sel->ifindex || !sel->ifindex); 547 } 548 549 static inline int 550 xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, 551 unsigned short family) 552 { 553 switch (family) { 554 case AF_INET: 555 return __xfrm4_selector_match(sel, fl); 556 case AF_INET6: 557 return __xfrm6_selector_match(sel, fl); 558 } 559 return 0; 560 } 561 562 #ifdef CONFIG_SECURITY_NETWORK_XFRM 563 /* If neither has a context --> match 564 * Otherwise, both must have a context and the sids, doi, alg must match 565 */ 566 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 567 { 568 return ((!s1 && !s2) || 569 (s1 && s2 && 570 (s1->ctx_sid == s2->ctx_sid) && 571 (s1->ctx_doi == s2->ctx_doi) && 572 (s1->ctx_alg == s2->ctx_alg))); 573 } 574 #else 575 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 576 { 577 return 1; 578 } 579 #endif 580 581 /* A struct encoding bundle of transformations to apply to some set of flow. 582 * 583 * dst->child points to the next element of bundle. 584 * dst->xfrm points to an instanse of transformer. 585 * 586 * Due to unfortunate limitations of current routing cache, which we 587 * have no time to fix, it mirrors struct rtable and bound to the same 588 * routing key, including saddr,daddr. However, we can have many of 589 * bundles differing by session id. All the bundles grow from a parent 590 * policy rule. 591 */ 592 struct xfrm_dst 593 { 594 union { 595 struct xfrm_dst *next; 596 struct dst_entry dst; 597 struct rtable rt; 598 struct rt6_info rt6; 599 } u; 600 struct dst_entry *route; 601 u32 route_mtu_cached; 602 u32 child_mtu_cached; 603 u32 route_cookie; 604 u32 path_cookie; 605 }; 606 607 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 608 { 609 dst_release(xdst->route); 610 if (likely(xdst->u.dst.xfrm)) 611 xfrm_state_put(xdst->u.dst.xfrm); 612 } 613 614 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 615 616 struct sec_path 617 { 618 atomic_t refcnt; 619 int len; 620 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 621 }; 622 623 static inline struct sec_path * 624 secpath_get(struct sec_path *sp) 625 { 626 if (sp) 627 atomic_inc(&sp->refcnt); 628 return sp; 629 } 630 631 extern void __secpath_destroy(struct sec_path *sp); 632 633 static inline void 634 secpath_put(struct sec_path *sp) 635 { 636 if (sp && atomic_dec_and_test(&sp->refcnt)) 637 __secpath_destroy(sp); 638 } 639 640 extern struct sec_path *secpath_dup(struct sec_path *src); 641 642 static inline void 643 secpath_reset(struct sk_buff *skb) 644 { 645 #ifdef CONFIG_XFRM 646 secpath_put(skb->sp); 647 skb->sp = NULL; 648 #endif 649 } 650 651 static inline int 652 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 653 { 654 return (tmpl->saddr.a4 && 655 tmpl->saddr.a4 != x->props.saddr.a4); 656 } 657 658 static inline int 659 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 660 { 661 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 662 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 663 } 664 665 static inline int 666 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family) 667 { 668 switch (family) { 669 case AF_INET: 670 return __xfrm4_state_addr_cmp(tmpl, x); 671 case AF_INET6: 672 return __xfrm6_state_addr_cmp(tmpl, x); 673 } 674 return !0; 675 } 676 677 #ifdef CONFIG_XFRM 678 679 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); 680 681 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 682 { 683 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 684 return __xfrm_policy_check(sk, dir, skb, family); 685 686 return (!xfrm_policy_list[dir] && !skb->sp) || 687 (skb->dst->flags & DST_NOPOLICY) || 688 __xfrm_policy_check(sk, dir, skb, family); 689 } 690 691 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 692 { 693 return xfrm_policy_check(sk, dir, skb, AF_INET); 694 } 695 696 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 697 { 698 return xfrm_policy_check(sk, dir, skb, AF_INET6); 699 } 700 701 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family); 702 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 703 704 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 705 { 706 return !xfrm_policy_list[XFRM_POLICY_OUT] || 707 (skb->dst->flags & DST_NOXFRM) || 708 __xfrm_route_forward(skb, family); 709 } 710 711 static inline int xfrm4_route_forward(struct sk_buff *skb) 712 { 713 return xfrm_route_forward(skb, AF_INET); 714 } 715 716 static inline int xfrm6_route_forward(struct sk_buff *skb) 717 { 718 return xfrm_route_forward(skb, AF_INET6); 719 } 720 721 extern int __xfrm_sk_clone_policy(struct sock *sk); 722 723 static inline int xfrm_sk_clone_policy(struct sock *sk) 724 { 725 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) 726 return __xfrm_sk_clone_policy(sk); 727 return 0; 728 } 729 730 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 731 732 static inline void xfrm_sk_free_policy(struct sock *sk) 733 { 734 if (unlikely(sk->sk_policy[0] != NULL)) { 735 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); 736 sk->sk_policy[0] = NULL; 737 } 738 if (unlikely(sk->sk_policy[1] != NULL)) { 739 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); 740 sk->sk_policy[1] = NULL; 741 } 742 } 743 744 #else 745 746 static inline void xfrm_sk_free_policy(struct sock *sk) {} 747 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } 748 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 749 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 750 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 751 { 752 return 1; 753 } 754 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 755 { 756 return 1; 757 } 758 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 759 { 760 return 1; 761 } 762 #endif 763 764 static __inline__ 765 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family) 766 { 767 switch (family){ 768 case AF_INET: 769 return (xfrm_address_t *)&fl->fl4_dst; 770 case AF_INET6: 771 return (xfrm_address_t *)&fl->fl6_dst; 772 } 773 return NULL; 774 } 775 776 static __inline__ 777 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family) 778 { 779 switch (family){ 780 case AF_INET: 781 return (xfrm_address_t *)&fl->fl4_src; 782 case AF_INET6: 783 return (xfrm_address_t *)&fl->fl6_src; 784 } 785 return NULL; 786 } 787 788 static __inline__ int 789 __xfrm4_state_addr_check(struct xfrm_state *x, 790 xfrm_address_t *daddr, xfrm_address_t *saddr) 791 { 792 if (daddr->a4 == x->id.daddr.a4 && 793 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 794 return 1; 795 return 0; 796 } 797 798 static __inline__ int 799 __xfrm6_state_addr_check(struct xfrm_state *x, 800 xfrm_address_t *daddr, xfrm_address_t *saddr) 801 { 802 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 803 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| 804 ipv6_addr_any((struct in6_addr *)saddr) || 805 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 806 return 1; 807 return 0; 808 } 809 810 static __inline__ int 811 xfrm_state_addr_check(struct xfrm_state *x, 812 xfrm_address_t *daddr, xfrm_address_t *saddr, 813 unsigned short family) 814 { 815 switch (family) { 816 case AF_INET: 817 return __xfrm4_state_addr_check(x, daddr, saddr); 818 case AF_INET6: 819 return __xfrm6_state_addr_check(x, daddr, saddr); 820 } 821 return 0; 822 } 823 824 static inline int xfrm_state_kern(struct xfrm_state *x) 825 { 826 return atomic_read(&x->tunnel_users); 827 } 828 829 /* 830 * xfrm algorithm information 831 */ 832 struct xfrm_algo_auth_info { 833 u16 icv_truncbits; 834 u16 icv_fullbits; 835 }; 836 837 struct xfrm_algo_encr_info { 838 u16 blockbits; 839 u16 defkeybits; 840 }; 841 842 struct xfrm_algo_comp_info { 843 u16 threshold; 844 }; 845 846 struct xfrm_algo_desc { 847 char *name; 848 u8 available:1; 849 union { 850 struct xfrm_algo_auth_info auth; 851 struct xfrm_algo_encr_info encr; 852 struct xfrm_algo_comp_info comp; 853 } uinfo; 854 struct sadb_alg desc; 855 }; 856 857 /* XFRM tunnel handlers. */ 858 struct xfrm_tunnel { 859 int (*handler)(struct sk_buff *skb); 860 int (*err_handler)(struct sk_buff *skb, __u32 info); 861 862 struct xfrm_tunnel *next; 863 int priority; 864 }; 865 866 struct xfrm6_tunnel { 867 int (*handler)(struct sk_buff *skb); 868 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 869 int type, int code, int offset, __u32 info); 870 871 struct xfrm6_tunnel *next; 872 int priority; 873 }; 874 875 extern void xfrm_init(void); 876 extern void xfrm4_init(void); 877 extern void xfrm6_init(void); 878 extern void xfrm6_fini(void); 879 extern void xfrm_state_init(void); 880 extern void xfrm4_state_init(void); 881 extern void xfrm6_state_init(void); 882 extern void xfrm6_state_fini(void); 883 884 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *); 885 extern struct xfrm_state *xfrm_state_alloc(void); 886 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, 887 struct flowi *fl, struct xfrm_tmpl *tmpl, 888 struct xfrm_policy *pol, int *err, 889 unsigned short family); 890 extern int xfrm_state_check_expire(struct xfrm_state *x); 891 extern void xfrm_state_insert(struct xfrm_state *x); 892 extern int xfrm_state_add(struct xfrm_state *x); 893 extern int xfrm_state_update(struct xfrm_state *x); 894 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family); 895 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq); 896 extern int xfrm_state_delete(struct xfrm_state *x); 897 extern void xfrm_state_flush(u8 proto); 898 extern int xfrm_replay_check(struct xfrm_state *x, u32 seq); 899 extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq); 900 extern void xfrm_replay_notify(struct xfrm_state *x, int event); 901 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb); 902 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); 903 extern int xfrm_init_state(struct xfrm_state *x); 904 extern int xfrm4_rcv(struct sk_buff *skb); 905 extern int xfrm4_output(struct sk_buff *skb); 906 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler); 907 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler); 908 extern int xfrm6_rcv_spi(struct sk_buff *skb, u32 spi); 909 extern int xfrm6_rcv(struct sk_buff **pskb); 910 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler); 911 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler); 912 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr); 913 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr); 914 extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr); 915 extern int xfrm6_output(struct sk_buff *skb); 916 917 #ifdef CONFIG_XFRM 918 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type); 919 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); 920 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family); 921 #else 922 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 923 { 924 return -ENOPROTOOPT; 925 } 926 927 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type) 928 { 929 /* should not happen */ 930 kfree_skb(skb); 931 return 0; 932 } 933 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family) 934 { 935 return -EINVAL; 936 } 937 #endif 938 939 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp); 940 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *); 941 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 942 struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel, 943 struct xfrm_sec_ctx *ctx, int delete); 944 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete); 945 void xfrm_policy_flush(void); 946 u32 xfrm_get_acqseq(void); 947 void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 948 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto, 949 xfrm_address_t *daddr, xfrm_address_t *saddr, 950 int create, unsigned short family); 951 extern void xfrm_policy_flush(void); 952 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 953 extern int xfrm_flush_bundles(void); 954 extern void xfrm_flush_all_bundles(void); 955 extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family); 956 extern void xfrm_init_pmtu(struct dst_entry *dst); 957 958 extern wait_queue_head_t km_waitq; 959 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport); 960 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid); 961 962 extern void xfrm_input_init(void); 963 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq); 964 965 extern void xfrm_probe_algs(void); 966 extern int xfrm_count_auth_supported(void); 967 extern int xfrm_count_enc_supported(void); 968 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 969 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 970 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 971 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 972 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 973 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe); 974 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe); 975 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe); 976 977 struct crypto_tfm; 978 typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int); 979 980 extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm, 981 int offset, int len, icv_update_fn_t icv_update); 982 983 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b, 984 int family) 985 { 986 switch (family) { 987 default: 988 case AF_INET: 989 return a->a4 - b->a4; 990 case AF_INET6: 991 return ipv6_addr_cmp((struct in6_addr *)a, 992 (struct in6_addr *)b); 993 } 994 } 995 996 static inline int xfrm_policy_id2dir(u32 index) 997 { 998 return index & 7; 999 } 1000 1001 static inline int xfrm_aevent_is_on(void) 1002 { 1003 struct sock *nlsk; 1004 int ret = 0; 1005 1006 rcu_read_lock(); 1007 nlsk = rcu_dereference(xfrm_nl); 1008 if (nlsk) 1009 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1010 rcu_read_unlock(); 1011 return ret; 1012 } 1013 1014 static inline void xfrm_aevent_doreplay(struct xfrm_state *x) 1015 { 1016 if (xfrm_aevent_is_on()) 1017 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); 1018 } 1019 1020 1021 #endif /* _NET_XFRM_H */ 1022