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/pfkeyv2.h> 12 #include <linux/ipsec.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_PROTO_ESP 50 23 #define XFRM_PROTO_AH 51 24 #define XFRM_PROTO_COMP 108 25 #define XFRM_PROTO_IPIP 4 26 #define XFRM_PROTO_IPV6 41 27 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING 28 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS 29 30 #define XFRM_ALIGN8(len) (((len) + 7) & ~7) 31 #define MODULE_ALIAS_XFRM_MODE(family, encap) \ 32 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap)) 33 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \ 34 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto)) 35 36 extern struct sock *xfrm_nl; 37 extern u32 sysctl_xfrm_aevent_etime; 38 extern u32 sysctl_xfrm_aevent_rseqth; 39 40 extern struct mutex xfrm_cfg_mutex; 41 42 /* Organization of SPD aka "XFRM rules" 43 ------------------------------------ 44 45 Basic objects: 46 - policy rule, struct xfrm_policy (=SPD entry) 47 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) 48 - instance of a transformer, struct xfrm_state (=SA) 49 - template to clone xfrm_state, struct xfrm_tmpl 50 51 SPD is plain linear list of xfrm_policy rules, ordered by priority. 52 (To be compatible with existing pfkeyv2 implementations, 53 many rules with priority of 0x7fffffff are allowed to exist and 54 such rules are ordered in an unpredictable way, thanks to bsd folks.) 55 56 Lookup is plain linear search until the first match with selector. 57 58 If "action" is "block", then we prohibit the flow, otherwise: 59 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, 60 policy entry has list of up to XFRM_MAX_DEPTH transformations, 61 described by templates xfrm_tmpl. Each template is resolved 62 to a complete xfrm_state (see below) and we pack bundle of transformations 63 to a dst_entry returned to requestor. 64 65 dst -. xfrm .-> xfrm_state #1 66 |---. child .-> dst -. xfrm .-> xfrm_state #2 67 |---. child .-> dst -. xfrm .-> xfrm_state #3 68 |---. child .-> NULL 69 70 Bundles are cached at xrfm_policy struct (field ->bundles). 71 72 73 Resolution of xrfm_tmpl 74 ----------------------- 75 Template contains: 76 1. ->mode Mode: transport or tunnel 77 2. ->id.proto Protocol: AH/ESP/IPCOMP 78 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. 79 Q: allow to resolve security gateway? 80 4. ->id.spi If not zero, static SPI. 81 5. ->saddr Local tunnel endpoint, ignored for transport mode. 82 6. ->algos List of allowed algos. Plain bitmask now. 83 Q: ealgos, aalgos, calgos. What a mess... 84 7. ->share Sharing mode. 85 Q: how to implement private sharing mode? To add struct sock* to 86 flow id? 87 88 Having this template we search through SAD searching for entries 89 with appropriate mode/proto/algo, permitted by selector. 90 If no appropriate entry found, it is requested from key manager. 91 92 PROBLEMS: 93 Q: How to find all the bundles referring to a physical path for 94 PMTU discovery? Seems, dst should contain list of all parents... 95 and enter to infinite locking hierarchy disaster. 96 No! It is easier, we will not search for them, let them find us. 97 We add genid to each dst plus pointer to genid of raw IP route, 98 pmtu disc will update pmtu on raw IP route and increase its genid. 99 dst_check() will see this for top level and trigger resyncing 100 metrics. Plus, it will be made via sk->sk_dst_cache. Solved. 101 */ 102 103 /* Full description of state of transformer. */ 104 struct xfrm_state 105 { 106 /* Note: bydst is re-used during gc */ 107 struct hlist_node bydst; 108 struct hlist_node bysrc; 109 struct hlist_node byspi; 110 111 atomic_t refcnt; 112 spinlock_t lock; 113 114 struct xfrm_id id; 115 struct xfrm_selector sel; 116 117 u32 genid; 118 119 /* Key manger bits */ 120 struct { 121 u8 state; 122 u8 dying; 123 u32 seq; 124 } km; 125 126 /* Parameters of this state. */ 127 struct { 128 u32 reqid; 129 u8 mode; 130 u8 replay_window; 131 u8 aalgo, ealgo, calgo; 132 u8 flags; 133 u16 family; 134 xfrm_address_t saddr; 135 int header_len; 136 int trailer_len; 137 } props; 138 139 struct xfrm_lifetime_cfg lft; 140 141 /* Data for transformer */ 142 struct xfrm_algo *aalg; 143 struct xfrm_algo *ealg; 144 struct xfrm_algo *calg; 145 146 /* Data for encapsulator */ 147 struct xfrm_encap_tmpl *encap; 148 149 /* Data for care-of address */ 150 xfrm_address_t *coaddr; 151 152 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 153 struct xfrm_state *tunnel; 154 155 /* If a tunnel, number of users + 1 */ 156 atomic_t tunnel_users; 157 158 /* State for replay detection */ 159 struct xfrm_replay_state replay; 160 161 /* Replay detection state at the time we sent the last notification */ 162 struct xfrm_replay_state preplay; 163 164 /* internal flag that only holds state for delayed aevent at the 165 * moment 166 */ 167 u32 xflags; 168 169 /* Replay detection notification settings */ 170 u32 replay_maxage; 171 u32 replay_maxdiff; 172 173 /* Replay detection notification timer */ 174 struct timer_list rtimer; 175 176 /* Statistics */ 177 struct xfrm_stats stats; 178 179 struct xfrm_lifetime_cur curlft; 180 struct timer_list timer; 181 182 /* Last used time */ 183 u64 lastused; 184 185 /* Reference to data common to all the instances of this 186 * transformer. */ 187 struct xfrm_type *type; 188 struct xfrm_mode *mode; 189 190 /* Security context */ 191 struct xfrm_sec_ctx *security; 192 193 /* Private data of this transformer, format is opaque, 194 * interpreted by xfrm_type methods. */ 195 void *data; 196 }; 197 198 /* xflags - make enum if more show up */ 199 #define XFRM_TIME_DEFER 1 200 201 enum { 202 XFRM_STATE_VOID, 203 XFRM_STATE_ACQ, 204 XFRM_STATE_VALID, 205 XFRM_STATE_ERROR, 206 XFRM_STATE_EXPIRED, 207 XFRM_STATE_DEAD 208 }; 209 210 /* callback structure passed from either netlink or pfkey */ 211 struct km_event 212 { 213 union { 214 u32 hard; 215 u32 proto; 216 u32 byid; 217 u32 aevent; 218 u32 type; 219 } data; 220 221 u32 seq; 222 u32 pid; 223 u32 event; 224 }; 225 226 struct xfrm_type; 227 struct xfrm_dst; 228 struct xfrm_policy_afinfo { 229 unsigned short family; 230 struct xfrm_type *type_map[IPPROTO_MAX]; 231 struct xfrm_mode *mode_map[XFRM_MODE_MAX]; 232 struct dst_ops *dst_ops; 233 void (*garbage_collect)(void); 234 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl); 235 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr); 236 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy); 237 int (*bundle_create)(struct xfrm_policy *policy, 238 struct xfrm_state **xfrm, 239 int nx, 240 struct flowi *fl, 241 struct dst_entry **dst_p); 242 void (*decode_session)(struct sk_buff *skb, 243 struct flowi *fl); 244 }; 245 246 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); 247 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); 248 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c); 249 extern void km_state_notify(struct xfrm_state *x, struct km_event *c); 250 251 struct xfrm_tmpl; 252 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); 253 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid); 254 extern int __xfrm_state_delete(struct xfrm_state *x); 255 256 struct xfrm_state_afinfo { 257 unsigned short family; 258 int (*init_flags)(struct xfrm_state *x); 259 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl, 260 struct xfrm_tmpl *tmpl, 261 xfrm_address_t *daddr, xfrm_address_t *saddr); 262 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n); 263 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n); 264 int (*output)(struct sk_buff *skb); 265 }; 266 267 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 268 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 269 extern struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family); 270 extern void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); 271 272 extern void xfrm_state_delete_tunnel(struct xfrm_state *x); 273 274 struct xfrm_type 275 { 276 char *description; 277 struct module *owner; 278 __u8 proto; 279 __u8 flags; 280 #define XFRM_TYPE_NON_FRAGMENT 1 281 282 int (*init_state)(struct xfrm_state *x); 283 void (*destructor)(struct xfrm_state *); 284 int (*input)(struct xfrm_state *, struct sk_buff *skb); 285 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 286 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *); 287 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **); 288 xfrm_address_t *(*local_addr)(struct xfrm_state *, xfrm_address_t *); 289 xfrm_address_t *(*remote_addr)(struct xfrm_state *, xfrm_address_t *); 290 /* Estimate maximal size of result of transformation of a dgram */ 291 u32 (*get_mtu)(struct xfrm_state *, int size); 292 }; 293 294 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family); 295 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family); 296 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family); 297 extern void xfrm_put_type(struct xfrm_type *type); 298 299 struct xfrm_mode { 300 int (*input)(struct xfrm_state *x, struct sk_buff *skb); 301 int (*output)(struct xfrm_state *x,struct sk_buff *skb); 302 303 struct module *owner; 304 unsigned int encap; 305 }; 306 307 extern int xfrm_register_mode(struct xfrm_mode *mode, int family); 308 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family); 309 extern struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family); 310 extern void xfrm_put_mode(struct xfrm_mode *mode); 311 312 struct xfrm_tmpl 313 { 314 /* id in template is interpreted as: 315 * daddr - destination of tunnel, may be zero for transport mode. 316 * spi - zero to acquire spi. Not zero if spi is static, then 317 * daddr must be fixed too. 318 * proto - AH/ESP/IPCOMP 319 */ 320 struct xfrm_id id; 321 322 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 323 xfrm_address_t saddr; 324 325 unsigned short encap_family; 326 327 __u32 reqid; 328 329 /* Mode: transport, tunnel etc. */ 330 __u8 mode; 331 332 /* Sharing mode: unique, this session only, this user only etc. */ 333 __u8 share; 334 335 /* May skip this transfomration if no SA is found */ 336 __u8 optional; 337 338 /* Bit mask of algos allowed for acquisition */ 339 __u32 aalgos; 340 __u32 ealgos; 341 __u32 calgos; 342 }; 343 344 #define XFRM_MAX_DEPTH 6 345 346 struct xfrm_policy 347 { 348 struct xfrm_policy *next; 349 struct hlist_node bydst; 350 struct hlist_node byidx; 351 352 /* This lock only affects elements except for entry. */ 353 rwlock_t lock; 354 atomic_t refcnt; 355 struct timer_list timer; 356 357 u32 priority; 358 u32 index; 359 struct xfrm_selector selector; 360 struct xfrm_lifetime_cfg lft; 361 struct xfrm_lifetime_cur curlft; 362 struct dst_entry *bundles; 363 u16 family; 364 u8 type; 365 u8 action; 366 u8 flags; 367 u8 dead; 368 u8 xfrm_nr; 369 /* XXX 1 byte hole, try to pack */ 370 struct xfrm_sec_ctx *security; 371 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 372 }; 373 374 struct xfrm_migrate { 375 xfrm_address_t old_daddr; 376 xfrm_address_t old_saddr; 377 xfrm_address_t new_daddr; 378 xfrm_address_t new_saddr; 379 u8 proto; 380 u8 mode; 381 u16 reserved; 382 u32 reqid; 383 u16 old_family; 384 u16 new_family; 385 }; 386 387 #define XFRM_KM_TIMEOUT 30 388 /* which seqno */ 389 #define XFRM_REPLAY_SEQ 1 390 #define XFRM_REPLAY_OSEQ 2 391 #define XFRM_REPLAY_SEQ_MASK 3 392 /* what happened */ 393 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 394 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 395 396 /* default aevent timeout in units of 100ms */ 397 #define XFRM_AE_ETIME 10 398 /* Async Event timer multiplier */ 399 #define XFRM_AE_ETH_M 10 400 /* default seq threshold size */ 401 #define XFRM_AE_SEQT_SIZE 2 402 403 struct xfrm_mgr 404 { 405 struct list_head list; 406 char *id; 407 int (*notify)(struct xfrm_state *x, struct km_event *c); 408 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); 409 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 410 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 411 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c); 412 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 413 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles); 414 }; 415 416 extern int xfrm_register_km(struct xfrm_mgr *km); 417 extern int xfrm_unregister_km(struct xfrm_mgr *km); 418 419 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2]; 420 421 /* Audit Information */ 422 struct xfrm_audit 423 { 424 uid_t loginuid; 425 u32 secid; 426 }; 427 428 #ifdef CONFIG_AUDITSYSCALL 429 extern void xfrm_audit_log(uid_t auid, u32 secid, int type, int result, 430 struct xfrm_policy *xp, struct xfrm_state *x); 431 #else 432 #define xfrm_audit_log(a,s,t,r,p,x) do { ; } while (0) 433 #endif /* CONFIG_AUDITSYSCALL */ 434 435 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 436 { 437 if (likely(policy != NULL)) 438 atomic_inc(&policy->refcnt); 439 } 440 441 extern void __xfrm_policy_destroy(struct xfrm_policy *policy); 442 443 static inline void xfrm_pol_put(struct xfrm_policy *policy) 444 { 445 if (atomic_dec_and_test(&policy->refcnt)) 446 __xfrm_policy_destroy(policy); 447 } 448 449 #ifdef CONFIG_XFRM_SUB_POLICY 450 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 451 { 452 int i; 453 for (i = npols - 1; i >= 0; --i) 454 xfrm_pol_put(pols[i]); 455 } 456 #else 457 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 458 { 459 xfrm_pol_put(pols[0]); 460 } 461 #endif 462 463 extern void __xfrm_state_destroy(struct xfrm_state *); 464 465 static inline void __xfrm_state_put(struct xfrm_state *x) 466 { 467 atomic_dec(&x->refcnt); 468 } 469 470 static inline void xfrm_state_put(struct xfrm_state *x) 471 { 472 if (atomic_dec_and_test(&x->refcnt)) 473 __xfrm_state_destroy(x); 474 } 475 476 static inline void xfrm_state_hold(struct xfrm_state *x) 477 { 478 atomic_inc(&x->refcnt); 479 } 480 481 static __inline__ int addr_match(void *token1, void *token2, int prefixlen) 482 { 483 __be32 *a1 = token1; 484 __be32 *a2 = token2; 485 int pdw; 486 int pbi; 487 488 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */ 489 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 490 491 if (pdw) 492 if (memcmp(a1, a2, pdw << 2)) 493 return 0; 494 495 if (pbi) { 496 __be32 mask; 497 498 mask = htonl((0xffffffff) << (32 - pbi)); 499 500 if ((a1[pdw] ^ a2[pdw]) & mask) 501 return 0; 502 } 503 504 return 1; 505 } 506 507 static __inline__ 508 __be16 xfrm_flowi_sport(struct flowi *fl) 509 { 510 __be16 port; 511 switch(fl->proto) { 512 case IPPROTO_TCP: 513 case IPPROTO_UDP: 514 case IPPROTO_UDPLITE: 515 case IPPROTO_SCTP: 516 port = fl->fl_ip_sport; 517 break; 518 case IPPROTO_ICMP: 519 case IPPROTO_ICMPV6: 520 port = htons(fl->fl_icmp_type); 521 break; 522 case IPPROTO_MH: 523 port = htons(fl->fl_mh_type); 524 break; 525 default: 526 port = 0; /*XXX*/ 527 } 528 return port; 529 } 530 531 static __inline__ 532 __be16 xfrm_flowi_dport(struct flowi *fl) 533 { 534 __be16 port; 535 switch(fl->proto) { 536 case IPPROTO_TCP: 537 case IPPROTO_UDP: 538 case IPPROTO_UDPLITE: 539 case IPPROTO_SCTP: 540 port = fl->fl_ip_dport; 541 break; 542 case IPPROTO_ICMP: 543 case IPPROTO_ICMPV6: 544 port = htons(fl->fl_icmp_code); 545 break; 546 default: 547 port = 0; /*XXX*/ 548 } 549 return port; 550 } 551 552 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, 553 unsigned short family); 554 555 #ifdef CONFIG_SECURITY_NETWORK_XFRM 556 /* If neither has a context --> match 557 * Otherwise, both must have a context and the sids, doi, alg must match 558 */ 559 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 560 { 561 return ((!s1 && !s2) || 562 (s1 && s2 && 563 (s1->ctx_sid == s2->ctx_sid) && 564 (s1->ctx_doi == s2->ctx_doi) && 565 (s1->ctx_alg == s2->ctx_alg))); 566 } 567 #else 568 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 569 { 570 return 1; 571 } 572 #endif 573 574 /* A struct encoding bundle of transformations to apply to some set of flow. 575 * 576 * dst->child points to the next element of bundle. 577 * dst->xfrm points to an instanse of transformer. 578 * 579 * Due to unfortunate limitations of current routing cache, which we 580 * have no time to fix, it mirrors struct rtable and bound to the same 581 * routing key, including saddr,daddr. However, we can have many of 582 * bundles differing by session id. All the bundles grow from a parent 583 * policy rule. 584 */ 585 struct xfrm_dst 586 { 587 union { 588 struct xfrm_dst *next; 589 struct dst_entry dst; 590 struct rtable rt; 591 struct rt6_info rt6; 592 } u; 593 struct dst_entry *route; 594 #ifdef CONFIG_XFRM_SUB_POLICY 595 struct flowi *origin; 596 struct xfrm_selector *partner; 597 #endif 598 u32 genid; 599 u32 route_mtu_cached; 600 u32 child_mtu_cached; 601 u32 route_cookie; 602 u32 path_cookie; 603 }; 604 605 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 606 { 607 dst_release(xdst->route); 608 if (likely(xdst->u.dst.xfrm)) 609 xfrm_state_put(xdst->u.dst.xfrm); 610 #ifdef CONFIG_XFRM_SUB_POLICY 611 kfree(xdst->origin); 612 xdst->origin = NULL; 613 kfree(xdst->partner); 614 xdst->partner = NULL; 615 #endif 616 } 617 618 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 619 620 struct sec_path 621 { 622 atomic_t refcnt; 623 int len; 624 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 625 }; 626 627 static inline struct sec_path * 628 secpath_get(struct sec_path *sp) 629 { 630 if (sp) 631 atomic_inc(&sp->refcnt); 632 return sp; 633 } 634 635 extern void __secpath_destroy(struct sec_path *sp); 636 637 static inline void 638 secpath_put(struct sec_path *sp) 639 { 640 if (sp && atomic_dec_and_test(&sp->refcnt)) 641 __secpath_destroy(sp); 642 } 643 644 extern struct sec_path *secpath_dup(struct sec_path *src); 645 646 static inline void 647 secpath_reset(struct sk_buff *skb) 648 { 649 #ifdef CONFIG_XFRM 650 secpath_put(skb->sp); 651 skb->sp = NULL; 652 #endif 653 } 654 655 static inline int 656 xfrm_addr_any(xfrm_address_t *addr, unsigned short family) 657 { 658 switch (family) { 659 case AF_INET: 660 return addr->a4 == 0; 661 case AF_INET6: 662 return ipv6_addr_any((struct in6_addr *)&addr->a6); 663 } 664 return 0; 665 } 666 667 static inline int 668 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 669 { 670 return (tmpl->saddr.a4 && 671 tmpl->saddr.a4 != x->props.saddr.a4); 672 } 673 674 static inline int 675 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 676 { 677 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 678 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 679 } 680 681 static inline int 682 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family) 683 { 684 switch (family) { 685 case AF_INET: 686 return __xfrm4_state_addr_cmp(tmpl, x); 687 case AF_INET6: 688 return __xfrm6_state_addr_cmp(tmpl, x); 689 } 690 return !0; 691 } 692 693 #ifdef CONFIG_XFRM 694 695 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); 696 697 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 698 { 699 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 700 return __xfrm_policy_check(sk, dir, skb, family); 701 702 return (!xfrm_policy_count[dir] && !skb->sp) || 703 (skb->dst->flags & DST_NOPOLICY) || 704 __xfrm_policy_check(sk, dir, skb, family); 705 } 706 707 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 708 { 709 return xfrm_policy_check(sk, dir, skb, AF_INET); 710 } 711 712 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 713 { 714 return xfrm_policy_check(sk, dir, skb, AF_INET6); 715 } 716 717 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family); 718 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 719 720 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 721 { 722 return !xfrm_policy_count[XFRM_POLICY_OUT] || 723 (skb->dst->flags & DST_NOXFRM) || 724 __xfrm_route_forward(skb, family); 725 } 726 727 static inline int xfrm4_route_forward(struct sk_buff *skb) 728 { 729 return xfrm_route_forward(skb, AF_INET); 730 } 731 732 static inline int xfrm6_route_forward(struct sk_buff *skb) 733 { 734 return xfrm_route_forward(skb, AF_INET6); 735 } 736 737 extern int __xfrm_sk_clone_policy(struct sock *sk); 738 739 static inline int xfrm_sk_clone_policy(struct sock *sk) 740 { 741 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) 742 return __xfrm_sk_clone_policy(sk); 743 return 0; 744 } 745 746 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 747 748 static inline void xfrm_sk_free_policy(struct sock *sk) 749 { 750 if (unlikely(sk->sk_policy[0] != NULL)) { 751 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); 752 sk->sk_policy[0] = NULL; 753 } 754 if (unlikely(sk->sk_policy[1] != NULL)) { 755 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); 756 sk->sk_policy[1] = NULL; 757 } 758 } 759 760 #else 761 762 static inline void xfrm_sk_free_policy(struct sock *sk) {} 763 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } 764 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 765 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 766 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 767 { 768 return 1; 769 } 770 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 771 { 772 return 1; 773 } 774 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 775 { 776 return 1; 777 } 778 #endif 779 780 static __inline__ 781 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family) 782 { 783 switch (family){ 784 case AF_INET: 785 return (xfrm_address_t *)&fl->fl4_dst; 786 case AF_INET6: 787 return (xfrm_address_t *)&fl->fl6_dst; 788 } 789 return NULL; 790 } 791 792 static __inline__ 793 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family) 794 { 795 switch (family){ 796 case AF_INET: 797 return (xfrm_address_t *)&fl->fl4_src; 798 case AF_INET6: 799 return (xfrm_address_t *)&fl->fl6_src; 800 } 801 return NULL; 802 } 803 804 static __inline__ int 805 __xfrm4_state_addr_check(struct xfrm_state *x, 806 xfrm_address_t *daddr, xfrm_address_t *saddr) 807 { 808 if (daddr->a4 == x->id.daddr.a4 && 809 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 810 return 1; 811 return 0; 812 } 813 814 static __inline__ int 815 __xfrm6_state_addr_check(struct xfrm_state *x, 816 xfrm_address_t *daddr, xfrm_address_t *saddr) 817 { 818 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 819 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| 820 ipv6_addr_any((struct in6_addr *)saddr) || 821 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 822 return 1; 823 return 0; 824 } 825 826 static __inline__ int 827 xfrm_state_addr_check(struct xfrm_state *x, 828 xfrm_address_t *daddr, xfrm_address_t *saddr, 829 unsigned short family) 830 { 831 switch (family) { 832 case AF_INET: 833 return __xfrm4_state_addr_check(x, daddr, saddr); 834 case AF_INET6: 835 return __xfrm6_state_addr_check(x, daddr, saddr); 836 } 837 return 0; 838 } 839 840 static __inline__ int 841 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl, 842 unsigned short family) 843 { 844 switch (family) { 845 case AF_INET: 846 return __xfrm4_state_addr_check(x, 847 (xfrm_address_t *)&fl->fl4_dst, 848 (xfrm_address_t *)&fl->fl4_src); 849 case AF_INET6: 850 return __xfrm6_state_addr_check(x, 851 (xfrm_address_t *)&fl->fl6_dst, 852 (xfrm_address_t *)&fl->fl6_src); 853 } 854 return 0; 855 } 856 857 static inline int xfrm_state_kern(struct xfrm_state *x) 858 { 859 return atomic_read(&x->tunnel_users); 860 } 861 862 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 863 { 864 return (!userproto || proto == userproto || 865 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 866 proto == IPPROTO_ESP || 867 proto == IPPROTO_COMP))); 868 } 869 870 /* 871 * xfrm algorithm information 872 */ 873 struct xfrm_algo_auth_info { 874 u16 icv_truncbits; 875 u16 icv_fullbits; 876 }; 877 878 struct xfrm_algo_encr_info { 879 u16 blockbits; 880 u16 defkeybits; 881 }; 882 883 struct xfrm_algo_comp_info { 884 u16 threshold; 885 }; 886 887 struct xfrm_algo_desc { 888 char *name; 889 char *compat; 890 u8 available:1; 891 union { 892 struct xfrm_algo_auth_info auth; 893 struct xfrm_algo_encr_info encr; 894 struct xfrm_algo_comp_info comp; 895 } uinfo; 896 struct sadb_alg desc; 897 }; 898 899 /* XFRM tunnel handlers. */ 900 struct xfrm_tunnel { 901 int (*handler)(struct sk_buff *skb); 902 int (*err_handler)(struct sk_buff *skb, __u32 info); 903 904 struct xfrm_tunnel *next; 905 int priority; 906 }; 907 908 struct xfrm6_tunnel { 909 int (*handler)(struct sk_buff *skb); 910 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 911 int type, int code, int offset, __be32 info); 912 struct xfrm6_tunnel *next; 913 int priority; 914 }; 915 916 extern void xfrm_init(void); 917 extern void xfrm4_init(void); 918 extern void xfrm6_init(void); 919 extern void xfrm6_fini(void); 920 extern void xfrm_state_init(void); 921 extern void xfrm4_state_init(void); 922 extern void xfrm6_state_init(void); 923 extern void xfrm6_state_fini(void); 924 925 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *); 926 extern struct xfrm_state *xfrm_state_alloc(void); 927 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, 928 struct flowi *fl, struct xfrm_tmpl *tmpl, 929 struct xfrm_policy *pol, int *err, 930 unsigned short family); 931 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr, 932 xfrm_address_t *saddr, 933 unsigned short family, 934 u8 mode, u8 proto, u32 reqid); 935 extern int xfrm_state_check_expire(struct xfrm_state *x); 936 extern void xfrm_state_insert(struct xfrm_state *x); 937 extern int xfrm_state_add(struct xfrm_state *x); 938 extern int xfrm_state_update(struct xfrm_state *x); 939 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family); 940 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family); 941 #ifdef CONFIG_XFRM_SUB_POLICY 942 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 943 int n, unsigned short family); 944 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 945 int n, unsigned short family); 946 #else 947 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 948 int n, unsigned short family) 949 { 950 return -ENOSYS; 951 } 952 953 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 954 int n, unsigned short family) 955 { 956 return -ENOSYS; 957 } 958 #endif 959 960 struct xfrmk_sadinfo { 961 u32 sadhcnt; /* current hash bkts */ 962 u32 sadhmcnt; /* max allowed hash bkts */ 963 u32 sadcnt; /* current running count */ 964 }; 965 966 struct xfrmk_spdinfo { 967 u32 incnt; 968 u32 outcnt; 969 u32 fwdcnt; 970 u32 inscnt; 971 u32 outscnt; 972 u32 fwdscnt; 973 u32 spdhcnt; 974 u32 spdhmcnt; 975 }; 976 977 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq); 978 extern int xfrm_state_delete(struct xfrm_state *x); 979 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info); 980 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si); 981 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si); 982 extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq); 983 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq); 984 extern void xfrm_replay_notify(struct xfrm_state *x, int event); 985 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb); 986 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); 987 extern int xfrm_init_state(struct xfrm_state *x); 988 extern int xfrm4_rcv(struct sk_buff *skb); 989 extern int xfrm4_output(struct sk_buff *skb); 990 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 991 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 992 extern int xfrm6_rcv_spi(struct sk_buff *skb, __be32 spi); 993 extern int xfrm6_rcv(struct sk_buff **pskb); 994 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 995 xfrm_address_t *saddr, u8 proto); 996 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 997 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 998 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr); 999 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr); 1000 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr); 1001 extern int xfrm6_output(struct sk_buff *skb); 1002 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, 1003 u8 **prevhdr); 1004 1005 #ifdef CONFIG_XFRM 1006 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1007 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); 1008 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family); 1009 #else 1010 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 1011 { 1012 return -ENOPROTOOPT; 1013 } 1014 1015 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb) 1016 { 1017 /* should not happen */ 1018 kfree_skb(skb); 1019 return 0; 1020 } 1021 1022 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family) 1023 { 1024 return -EINVAL; 1025 } 1026 #endif 1027 1028 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp); 1029 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *); 1030 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1031 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, 1032 struct xfrm_selector *sel, 1033 struct xfrm_sec_ctx *ctx, int delete, 1034 int *err); 1035 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err); 1036 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info); 1037 u32 xfrm_get_acqseq(void); 1038 void xfrm_alloc_spi(struct xfrm_state *x, __be32 minspi, __be32 maxspi); 1039 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto, 1040 xfrm_address_t *daddr, xfrm_address_t *saddr, 1041 int create, unsigned short family); 1042 extern int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info); 1043 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1044 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst, 1045 struct flowi *fl, int family, int strict); 1046 extern void xfrm_init_pmtu(struct dst_entry *dst); 1047 1048 #ifdef CONFIG_XFRM_MIGRATE 1049 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 1050 struct xfrm_migrate *m, int num_bundles); 1051 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m); 1052 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, 1053 struct xfrm_migrate *m); 1054 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 1055 struct xfrm_migrate *m, int num_bundles); 1056 #endif 1057 1058 extern wait_queue_head_t km_waitq; 1059 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1060 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid); 1061 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 1062 1063 extern void xfrm_input_init(void); 1064 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1065 1066 extern void xfrm_probe_algs(void); 1067 extern int xfrm_count_auth_supported(void); 1068 extern int xfrm_count_enc_supported(void); 1069 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1070 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1071 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1072 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1073 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1074 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe); 1075 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe); 1076 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe); 1077 1078 struct hash_desc; 1079 struct scatterlist; 1080 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *, 1081 unsigned int); 1082 1083 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm, 1084 int offset, int len, icv_update_fn_t icv_update); 1085 1086 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b, 1087 int family) 1088 { 1089 switch (family) { 1090 default: 1091 case AF_INET: 1092 return (__force __u32)a->a4 - (__force __u32)b->a4; 1093 case AF_INET6: 1094 return ipv6_addr_cmp((struct in6_addr *)a, 1095 (struct in6_addr *)b); 1096 } 1097 } 1098 1099 static inline int xfrm_policy_id2dir(u32 index) 1100 { 1101 return index & 7; 1102 } 1103 1104 static inline int xfrm_aevent_is_on(void) 1105 { 1106 struct sock *nlsk; 1107 int ret = 0; 1108 1109 rcu_read_lock(); 1110 nlsk = rcu_dereference(xfrm_nl); 1111 if (nlsk) 1112 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1113 rcu_read_unlock(); 1114 return ret; 1115 } 1116 1117 static inline void xfrm_aevent_doreplay(struct xfrm_state *x) 1118 { 1119 if (xfrm_aevent_is_on()) 1120 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); 1121 } 1122 1123 #ifdef CONFIG_XFRM_MIGRATE 1124 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1125 { 1126 return (struct xfrm_algo *)kmemdup(orig, sizeof(*orig) + orig->alg_key_len, GFP_KERNEL); 1127 } 1128 1129 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1130 { 1131 int i; 1132 for (i = 0; i < n; i++) 1133 xfrm_state_put(*(states + i)); 1134 } 1135 1136 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1137 { 1138 int i; 1139 for (i = 0; i < n; i++) 1140 xfrm_state_delete(*(states + i)); 1141 } 1142 #endif 1143 1144 #endif /* _NET_XFRM_H */ 1145