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_ALIGN8(len) (((len) + 7) & ~7) 23 #define MODULE_ALIAS_XFRM_MODE(family, encap) \ 24 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap)) 25 26 extern struct sock *xfrm_nl; 27 extern u32 sysctl_xfrm_aevent_etime; 28 extern u32 sysctl_xfrm_aevent_rseqth; 29 30 extern struct mutex xfrm_cfg_mutex; 31 32 /* Organization of SPD aka "XFRM rules" 33 ------------------------------------ 34 35 Basic objects: 36 - policy rule, struct xfrm_policy (=SPD entry) 37 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) 38 - instance of a transformer, struct xfrm_state (=SA) 39 - template to clone xfrm_state, struct xfrm_tmpl 40 41 SPD is plain linear list of xfrm_policy rules, ordered by priority. 42 (To be compatible with existing pfkeyv2 implementations, 43 many rules with priority of 0x7fffffff are allowed to exist and 44 such rules are ordered in an unpredictable way, thanks to bsd folks.) 45 46 Lookup is plain linear search until the first match with selector. 47 48 If "action" is "block", then we prohibit the flow, otherwise: 49 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, 50 policy entry has list of up to XFRM_MAX_DEPTH transformations, 51 described by templates xfrm_tmpl. Each template is resolved 52 to a complete xfrm_state (see below) and we pack bundle of transformations 53 to a dst_entry returned to requestor. 54 55 dst -. xfrm .-> xfrm_state #1 56 |---. child .-> dst -. xfrm .-> xfrm_state #2 57 |---. child .-> dst -. xfrm .-> xfrm_state #3 58 |---. child .-> NULL 59 60 Bundles are cached at xrfm_policy struct (field ->bundles). 61 62 63 Resolution of xrfm_tmpl 64 ----------------------- 65 Template contains: 66 1. ->mode Mode: transport or tunnel 67 2. ->id.proto Protocol: AH/ESP/IPCOMP 68 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. 69 Q: allow to resolve security gateway? 70 4. ->id.spi If not zero, static SPI. 71 5. ->saddr Local tunnel endpoint, ignored for transport mode. 72 6. ->algos List of allowed algos. Plain bitmask now. 73 Q: ealgos, aalgos, calgos. What a mess... 74 7. ->share Sharing mode. 75 Q: how to implement private sharing mode? To add struct sock* to 76 flow id? 77 78 Having this template we search through SAD searching for entries 79 with appropriate mode/proto/algo, permitted by selector. 80 If no appropriate entry found, it is requested from key manager. 81 82 PROBLEMS: 83 Q: How to find all the bundles referring to a physical path for 84 PMTU discovery? Seems, dst should contain list of all parents... 85 and enter to infinite locking hierarchy disaster. 86 No! It is easier, we will not search for them, let them find us. 87 We add genid to each dst plus pointer to genid of raw IP route, 88 pmtu disc will update pmtu on raw IP route and increase its genid. 89 dst_check() will see this for top level and trigger resyncing 90 metrics. Plus, it will be made via sk->sk_dst_cache. Solved. 91 */ 92 93 /* Full description of state of transformer. */ 94 struct xfrm_state 95 { 96 /* Note: bydst is re-used during gc */ 97 struct hlist_node bydst; 98 struct hlist_node bysrc; 99 struct hlist_node byspi; 100 101 atomic_t refcnt; 102 spinlock_t lock; 103 104 struct xfrm_id id; 105 struct xfrm_selector sel; 106 107 u32 genid; 108 109 /* Key manger bits */ 110 struct { 111 u8 state; 112 u8 dying; 113 u32 seq; 114 } km; 115 116 /* Parameters of this state. */ 117 struct { 118 u32 reqid; 119 u8 mode; 120 u8 replay_window; 121 u8 aalgo, ealgo, calgo; 122 u8 flags; 123 u16 family; 124 xfrm_address_t saddr; 125 int header_len; 126 int trailer_len; 127 } props; 128 129 struct xfrm_lifetime_cfg lft; 130 131 /* Data for transformer */ 132 struct xfrm_algo *aalg; 133 struct xfrm_algo *ealg; 134 struct xfrm_algo *calg; 135 136 /* Data for encapsulator */ 137 struct xfrm_encap_tmpl *encap; 138 139 /* Data for care-of address */ 140 xfrm_address_t *coaddr; 141 142 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 143 struct xfrm_state *tunnel; 144 145 /* If a tunnel, number of users + 1 */ 146 atomic_t tunnel_users; 147 148 /* State for replay detection */ 149 struct xfrm_replay_state replay; 150 151 /* Replay detection state at the time we sent the last notification */ 152 struct xfrm_replay_state preplay; 153 154 /* internal flag that only holds state for delayed aevent at the 155 * moment 156 */ 157 u32 xflags; 158 159 /* Replay detection notification settings */ 160 u32 replay_maxage; 161 u32 replay_maxdiff; 162 163 /* Replay detection notification timer */ 164 struct timer_list rtimer; 165 166 /* Statistics */ 167 struct xfrm_stats stats; 168 169 struct xfrm_lifetime_cur curlft; 170 struct timer_list timer; 171 172 /* Last used time */ 173 u64 lastused; 174 175 /* Reference to data common to all the instances of this 176 * transformer. */ 177 struct xfrm_type *type; 178 struct xfrm_mode *mode; 179 180 /* Security context */ 181 struct xfrm_sec_ctx *security; 182 183 /* Private data of this transformer, format is opaque, 184 * interpreted by xfrm_type methods. */ 185 void *data; 186 }; 187 188 /* xflags - make enum if more show up */ 189 #define XFRM_TIME_DEFER 1 190 191 enum { 192 XFRM_STATE_VOID, 193 XFRM_STATE_ACQ, 194 XFRM_STATE_VALID, 195 XFRM_STATE_ERROR, 196 XFRM_STATE_EXPIRED, 197 XFRM_STATE_DEAD 198 }; 199 200 /* callback structure passed from either netlink or pfkey */ 201 struct km_event 202 { 203 union { 204 u32 hard; 205 u32 proto; 206 u32 byid; 207 u32 aevent; 208 u32 type; 209 } data; 210 211 u32 seq; 212 u32 pid; 213 u32 event; 214 }; 215 216 struct xfrm_type; 217 struct xfrm_dst; 218 struct xfrm_policy_afinfo { 219 unsigned short family; 220 struct xfrm_type *type_map[IPPROTO_MAX]; 221 struct xfrm_mode *mode_map[XFRM_MODE_MAX]; 222 struct dst_ops *dst_ops; 223 void (*garbage_collect)(void); 224 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl); 225 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr); 226 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy); 227 int (*bundle_create)(struct xfrm_policy *policy, 228 struct xfrm_state **xfrm, 229 int nx, 230 struct flowi *fl, 231 struct dst_entry **dst_p); 232 void (*decode_session)(struct sk_buff *skb, 233 struct flowi *fl); 234 }; 235 236 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); 237 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); 238 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c); 239 extern void km_state_notify(struct xfrm_state *x, struct km_event *c); 240 241 struct xfrm_tmpl; 242 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); 243 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid); 244 extern int __xfrm_state_delete(struct xfrm_state *x); 245 246 struct xfrm_state_afinfo { 247 unsigned short family; 248 int (*init_flags)(struct xfrm_state *x); 249 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl, 250 struct xfrm_tmpl *tmpl, 251 xfrm_address_t *daddr, xfrm_address_t *saddr); 252 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n); 253 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n); 254 int (*output)(struct sk_buff *skb); 255 }; 256 257 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 258 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 259 extern struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family); 260 extern void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); 261 262 extern void xfrm_state_delete_tunnel(struct xfrm_state *x); 263 264 struct xfrm_type 265 { 266 char *description; 267 struct module *owner; 268 __u8 proto; 269 __u8 flags; 270 #define XFRM_TYPE_NON_FRAGMENT 1 271 272 int (*init_state)(struct xfrm_state *x); 273 void (*destructor)(struct xfrm_state *); 274 int (*input)(struct xfrm_state *, struct sk_buff *skb); 275 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 276 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *); 277 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **); 278 xfrm_address_t *(*local_addr)(struct xfrm_state *, xfrm_address_t *); 279 xfrm_address_t *(*remote_addr)(struct xfrm_state *, xfrm_address_t *); 280 /* Estimate maximal size of result of transformation of a dgram */ 281 u32 (*get_mtu)(struct xfrm_state *, int size); 282 }; 283 284 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family); 285 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family); 286 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family); 287 extern void xfrm_put_type(struct xfrm_type *type); 288 289 struct xfrm_mode { 290 int (*input)(struct xfrm_state *x, struct sk_buff *skb); 291 int (*output)(struct xfrm_state *x,struct sk_buff *skb); 292 293 struct module *owner; 294 unsigned int encap; 295 }; 296 297 extern int xfrm_register_mode(struct xfrm_mode *mode, int family); 298 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family); 299 extern struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family); 300 extern void xfrm_put_mode(struct xfrm_mode *mode); 301 302 struct xfrm_tmpl 303 { 304 /* id in template is interpreted as: 305 * daddr - destination of tunnel, may be zero for transport mode. 306 * spi - zero to acquire spi. Not zero if spi is static, then 307 * daddr must be fixed too. 308 * proto - AH/ESP/IPCOMP 309 */ 310 struct xfrm_id id; 311 312 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 313 xfrm_address_t saddr; 314 315 unsigned short encap_family; 316 317 __u32 reqid; 318 319 /* Mode: transport, tunnel etc. */ 320 __u8 mode; 321 322 /* Sharing mode: unique, this session only, this user only etc. */ 323 __u8 share; 324 325 /* May skip this transfomration if no SA is found */ 326 __u8 optional; 327 328 /* Bit mask of algos allowed for acquisition */ 329 __u32 aalgos; 330 __u32 ealgos; 331 __u32 calgos; 332 }; 333 334 #define XFRM_MAX_DEPTH 6 335 336 struct xfrm_policy 337 { 338 struct xfrm_policy *next; 339 struct hlist_node bydst; 340 struct hlist_node byidx; 341 342 /* This lock only affects elements except for entry. */ 343 rwlock_t lock; 344 atomic_t refcnt; 345 struct timer_list timer; 346 347 u32 priority; 348 u32 index; 349 struct xfrm_selector selector; 350 struct xfrm_lifetime_cfg lft; 351 struct xfrm_lifetime_cur curlft; 352 struct dst_entry *bundles; 353 u16 family; 354 u8 type; 355 u8 action; 356 u8 flags; 357 u8 dead; 358 u8 xfrm_nr; 359 /* XXX 1 byte hole, try to pack */ 360 struct xfrm_sec_ctx *security; 361 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 362 }; 363 364 struct xfrm_migrate { 365 xfrm_address_t old_daddr; 366 xfrm_address_t old_saddr; 367 xfrm_address_t new_daddr; 368 xfrm_address_t new_saddr; 369 u8 proto; 370 u8 mode; 371 u16 reserved; 372 u32 reqid; 373 u16 old_family; 374 u16 new_family; 375 }; 376 377 #define XFRM_KM_TIMEOUT 30 378 /* which seqno */ 379 #define XFRM_REPLAY_SEQ 1 380 #define XFRM_REPLAY_OSEQ 2 381 #define XFRM_REPLAY_SEQ_MASK 3 382 /* what happened */ 383 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 384 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 385 386 /* default aevent timeout in units of 100ms */ 387 #define XFRM_AE_ETIME 10 388 /* Async Event timer multiplier */ 389 #define XFRM_AE_ETH_M 10 390 /* default seq threshold size */ 391 #define XFRM_AE_SEQT_SIZE 2 392 393 struct xfrm_mgr 394 { 395 struct list_head list; 396 char *id; 397 int (*notify)(struct xfrm_state *x, struct km_event *c); 398 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); 399 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 400 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 401 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c); 402 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 403 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles); 404 }; 405 406 extern int xfrm_register_km(struct xfrm_mgr *km); 407 extern int xfrm_unregister_km(struct xfrm_mgr *km); 408 409 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2]; 410 411 /* Audit Information */ 412 struct xfrm_audit 413 { 414 uid_t loginuid; 415 u32 secid; 416 }; 417 418 #ifdef CONFIG_AUDITSYSCALL 419 extern void xfrm_audit_log(uid_t auid, u32 secid, int type, int result, 420 struct xfrm_policy *xp, struct xfrm_state *x); 421 #else 422 #define xfrm_audit_log(a,s,t,r,p,x) do { ; } while (0) 423 #endif /* CONFIG_AUDITSYSCALL */ 424 425 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 426 { 427 if (likely(policy != NULL)) 428 atomic_inc(&policy->refcnt); 429 } 430 431 extern void __xfrm_policy_destroy(struct xfrm_policy *policy); 432 433 static inline void xfrm_pol_put(struct xfrm_policy *policy) 434 { 435 if (atomic_dec_and_test(&policy->refcnt)) 436 __xfrm_policy_destroy(policy); 437 } 438 439 #ifdef CONFIG_XFRM_SUB_POLICY 440 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 441 { 442 int i; 443 for (i = npols - 1; i >= 0; --i) 444 xfrm_pol_put(pols[i]); 445 } 446 #else 447 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 448 { 449 xfrm_pol_put(pols[0]); 450 } 451 #endif 452 453 extern void __xfrm_state_destroy(struct xfrm_state *); 454 455 static inline void __xfrm_state_put(struct xfrm_state *x) 456 { 457 atomic_dec(&x->refcnt); 458 } 459 460 static inline void xfrm_state_put(struct xfrm_state *x) 461 { 462 if (atomic_dec_and_test(&x->refcnt)) 463 __xfrm_state_destroy(x); 464 } 465 466 static inline void xfrm_state_hold(struct xfrm_state *x) 467 { 468 atomic_inc(&x->refcnt); 469 } 470 471 static __inline__ int addr_match(void *token1, void *token2, int prefixlen) 472 { 473 __be32 *a1 = token1; 474 __be32 *a2 = token2; 475 int pdw; 476 int pbi; 477 478 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */ 479 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 480 481 if (pdw) 482 if (memcmp(a1, a2, pdw << 2)) 483 return 0; 484 485 if (pbi) { 486 __be32 mask; 487 488 mask = htonl((0xffffffff) << (32 - pbi)); 489 490 if ((a1[pdw] ^ a2[pdw]) & mask) 491 return 0; 492 } 493 494 return 1; 495 } 496 497 static __inline__ 498 __be16 xfrm_flowi_sport(struct flowi *fl) 499 { 500 __be16 port; 501 switch(fl->proto) { 502 case IPPROTO_TCP: 503 case IPPROTO_UDP: 504 case IPPROTO_UDPLITE: 505 case IPPROTO_SCTP: 506 port = fl->fl_ip_sport; 507 break; 508 case IPPROTO_ICMP: 509 case IPPROTO_ICMPV6: 510 port = htons(fl->fl_icmp_type); 511 break; 512 #ifdef CONFIG_IPV6_MIP6 513 case IPPROTO_MH: 514 port = htons(fl->fl_mh_type); 515 break; 516 #endif 517 default: 518 port = 0; /*XXX*/ 519 } 520 return port; 521 } 522 523 static __inline__ 524 __be16 xfrm_flowi_dport(struct flowi *fl) 525 { 526 __be16 port; 527 switch(fl->proto) { 528 case IPPROTO_TCP: 529 case IPPROTO_UDP: 530 case IPPROTO_UDPLITE: 531 case IPPROTO_SCTP: 532 port = fl->fl_ip_dport; 533 break; 534 case IPPROTO_ICMP: 535 case IPPROTO_ICMPV6: 536 port = htons(fl->fl_icmp_code); 537 break; 538 default: 539 port = 0; /*XXX*/ 540 } 541 return port; 542 } 543 544 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, 545 unsigned short family); 546 547 #ifdef CONFIG_SECURITY_NETWORK_XFRM 548 /* If neither has a context --> match 549 * Otherwise, both must have a context and the sids, doi, alg must match 550 */ 551 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 552 { 553 return ((!s1 && !s2) || 554 (s1 && s2 && 555 (s1->ctx_sid == s2->ctx_sid) && 556 (s1->ctx_doi == s2->ctx_doi) && 557 (s1->ctx_alg == s2->ctx_alg))); 558 } 559 #else 560 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 561 { 562 return 1; 563 } 564 #endif 565 566 /* A struct encoding bundle of transformations to apply to some set of flow. 567 * 568 * dst->child points to the next element of bundle. 569 * dst->xfrm points to an instanse of transformer. 570 * 571 * Due to unfortunate limitations of current routing cache, which we 572 * have no time to fix, it mirrors struct rtable and bound to the same 573 * routing key, including saddr,daddr. However, we can have many of 574 * bundles differing by session id. All the bundles grow from a parent 575 * policy rule. 576 */ 577 struct xfrm_dst 578 { 579 union { 580 struct xfrm_dst *next; 581 struct dst_entry dst; 582 struct rtable rt; 583 struct rt6_info rt6; 584 } u; 585 struct dst_entry *route; 586 #ifdef CONFIG_XFRM_SUB_POLICY 587 struct flowi *origin; 588 struct xfrm_selector *partner; 589 #endif 590 u32 genid; 591 u32 route_mtu_cached; 592 u32 child_mtu_cached; 593 u32 route_cookie; 594 u32 path_cookie; 595 }; 596 597 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 598 { 599 dst_release(xdst->route); 600 if (likely(xdst->u.dst.xfrm)) 601 xfrm_state_put(xdst->u.dst.xfrm); 602 #ifdef CONFIG_XFRM_SUB_POLICY 603 kfree(xdst->origin); 604 xdst->origin = NULL; 605 kfree(xdst->partner); 606 xdst->partner = NULL; 607 #endif 608 } 609 610 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 611 612 struct sec_path 613 { 614 atomic_t refcnt; 615 int len; 616 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 617 }; 618 619 static inline struct sec_path * 620 secpath_get(struct sec_path *sp) 621 { 622 if (sp) 623 atomic_inc(&sp->refcnt); 624 return sp; 625 } 626 627 extern void __secpath_destroy(struct sec_path *sp); 628 629 static inline void 630 secpath_put(struct sec_path *sp) 631 { 632 if (sp && atomic_dec_and_test(&sp->refcnt)) 633 __secpath_destroy(sp); 634 } 635 636 extern struct sec_path *secpath_dup(struct sec_path *src); 637 638 static inline void 639 secpath_reset(struct sk_buff *skb) 640 { 641 #ifdef CONFIG_XFRM 642 secpath_put(skb->sp); 643 skb->sp = NULL; 644 #endif 645 } 646 647 static inline int 648 xfrm_addr_any(xfrm_address_t *addr, unsigned short family) 649 { 650 switch (family) { 651 case AF_INET: 652 return addr->a4 == 0; 653 case AF_INET6: 654 return ipv6_addr_any((struct in6_addr *)&addr->a6); 655 } 656 return 0; 657 } 658 659 static inline int 660 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 661 { 662 return (tmpl->saddr.a4 && 663 tmpl->saddr.a4 != x->props.saddr.a4); 664 } 665 666 static inline int 667 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 668 { 669 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 670 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 671 } 672 673 static inline int 674 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family) 675 { 676 switch (family) { 677 case AF_INET: 678 return __xfrm4_state_addr_cmp(tmpl, x); 679 case AF_INET6: 680 return __xfrm6_state_addr_cmp(tmpl, x); 681 } 682 return !0; 683 } 684 685 #ifdef CONFIG_XFRM 686 687 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); 688 689 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 690 { 691 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 692 return __xfrm_policy_check(sk, dir, skb, family); 693 694 return (!xfrm_policy_count[dir] && !skb->sp) || 695 (skb->dst->flags & DST_NOPOLICY) || 696 __xfrm_policy_check(sk, dir, skb, family); 697 } 698 699 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 700 { 701 return xfrm_policy_check(sk, dir, skb, AF_INET); 702 } 703 704 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 705 { 706 return xfrm_policy_check(sk, dir, skb, AF_INET6); 707 } 708 709 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family); 710 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 711 712 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 713 { 714 return !xfrm_policy_count[XFRM_POLICY_OUT] || 715 (skb->dst->flags & DST_NOXFRM) || 716 __xfrm_route_forward(skb, family); 717 } 718 719 static inline int xfrm4_route_forward(struct sk_buff *skb) 720 { 721 return xfrm_route_forward(skb, AF_INET); 722 } 723 724 static inline int xfrm6_route_forward(struct sk_buff *skb) 725 { 726 return xfrm_route_forward(skb, AF_INET6); 727 } 728 729 extern int __xfrm_sk_clone_policy(struct sock *sk); 730 731 static inline int xfrm_sk_clone_policy(struct sock *sk) 732 { 733 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) 734 return __xfrm_sk_clone_policy(sk); 735 return 0; 736 } 737 738 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 739 740 static inline void xfrm_sk_free_policy(struct sock *sk) 741 { 742 if (unlikely(sk->sk_policy[0] != NULL)) { 743 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); 744 sk->sk_policy[0] = NULL; 745 } 746 if (unlikely(sk->sk_policy[1] != NULL)) { 747 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); 748 sk->sk_policy[1] = NULL; 749 } 750 } 751 752 #else 753 754 static inline void xfrm_sk_free_policy(struct sock *sk) {} 755 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } 756 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 757 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 758 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 759 { 760 return 1; 761 } 762 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 763 { 764 return 1; 765 } 766 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 767 { 768 return 1; 769 } 770 #endif 771 772 static __inline__ 773 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family) 774 { 775 switch (family){ 776 case AF_INET: 777 return (xfrm_address_t *)&fl->fl4_dst; 778 case AF_INET6: 779 return (xfrm_address_t *)&fl->fl6_dst; 780 } 781 return NULL; 782 } 783 784 static __inline__ 785 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family) 786 { 787 switch (family){ 788 case AF_INET: 789 return (xfrm_address_t *)&fl->fl4_src; 790 case AF_INET6: 791 return (xfrm_address_t *)&fl->fl6_src; 792 } 793 return NULL; 794 } 795 796 static __inline__ int 797 __xfrm4_state_addr_check(struct xfrm_state *x, 798 xfrm_address_t *daddr, xfrm_address_t *saddr) 799 { 800 if (daddr->a4 == x->id.daddr.a4 && 801 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 802 return 1; 803 return 0; 804 } 805 806 static __inline__ int 807 __xfrm6_state_addr_check(struct xfrm_state *x, 808 xfrm_address_t *daddr, xfrm_address_t *saddr) 809 { 810 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 811 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| 812 ipv6_addr_any((struct in6_addr *)saddr) || 813 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 814 return 1; 815 return 0; 816 } 817 818 static __inline__ int 819 xfrm_state_addr_check(struct xfrm_state *x, 820 xfrm_address_t *daddr, xfrm_address_t *saddr, 821 unsigned short family) 822 { 823 switch (family) { 824 case AF_INET: 825 return __xfrm4_state_addr_check(x, daddr, saddr); 826 case AF_INET6: 827 return __xfrm6_state_addr_check(x, daddr, saddr); 828 } 829 return 0; 830 } 831 832 static __inline__ int 833 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl, 834 unsigned short family) 835 { 836 switch (family) { 837 case AF_INET: 838 return __xfrm4_state_addr_check(x, 839 (xfrm_address_t *)&fl->fl4_dst, 840 (xfrm_address_t *)&fl->fl4_src); 841 case AF_INET6: 842 return __xfrm6_state_addr_check(x, 843 (xfrm_address_t *)&fl->fl6_dst, 844 (xfrm_address_t *)&fl->fl6_src); 845 } 846 return 0; 847 } 848 849 static inline int xfrm_state_kern(struct xfrm_state *x) 850 { 851 return atomic_read(&x->tunnel_users); 852 } 853 854 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 855 { 856 return (!userproto || proto == userproto || 857 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 858 proto == IPPROTO_ESP || 859 proto == IPPROTO_COMP))); 860 } 861 862 /* 863 * xfrm algorithm information 864 */ 865 struct xfrm_algo_auth_info { 866 u16 icv_truncbits; 867 u16 icv_fullbits; 868 }; 869 870 struct xfrm_algo_encr_info { 871 u16 blockbits; 872 u16 defkeybits; 873 }; 874 875 struct xfrm_algo_comp_info { 876 u16 threshold; 877 }; 878 879 struct xfrm_algo_desc { 880 char *name; 881 char *compat; 882 u8 available:1; 883 union { 884 struct xfrm_algo_auth_info auth; 885 struct xfrm_algo_encr_info encr; 886 struct xfrm_algo_comp_info comp; 887 } uinfo; 888 struct sadb_alg desc; 889 }; 890 891 /* XFRM tunnel handlers. */ 892 struct xfrm_tunnel { 893 int (*handler)(struct sk_buff *skb); 894 int (*err_handler)(struct sk_buff *skb, __u32 info); 895 896 struct xfrm_tunnel *next; 897 int priority; 898 }; 899 900 struct xfrm6_tunnel { 901 int (*handler)(struct sk_buff *skb); 902 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 903 int type, int code, int offset, __be32 info); 904 struct xfrm6_tunnel *next; 905 int priority; 906 }; 907 908 extern void xfrm_init(void); 909 extern void xfrm4_init(void); 910 extern void xfrm6_init(void); 911 extern void xfrm6_fini(void); 912 extern void xfrm_state_init(void); 913 extern void xfrm4_state_init(void); 914 extern void xfrm6_state_init(void); 915 extern void xfrm6_state_fini(void); 916 917 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *); 918 extern struct xfrm_state *xfrm_state_alloc(void); 919 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, 920 struct flowi *fl, struct xfrm_tmpl *tmpl, 921 struct xfrm_policy *pol, int *err, 922 unsigned short family); 923 extern int xfrm_state_check_expire(struct xfrm_state *x); 924 extern void xfrm_state_insert(struct xfrm_state *x); 925 extern int xfrm_state_add(struct xfrm_state *x); 926 extern int xfrm_state_update(struct xfrm_state *x); 927 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family); 928 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family); 929 #ifdef CONFIG_XFRM_SUB_POLICY 930 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 931 int n, unsigned short family); 932 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 933 int n, unsigned short family); 934 #else 935 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 936 int n, unsigned short family) 937 { 938 return -ENOSYS; 939 } 940 941 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 942 int n, unsigned short family) 943 { 944 return -ENOSYS; 945 } 946 #endif 947 948 struct xfrmk_sadinfo { 949 u32 sadhcnt; /* current hash bkts */ 950 u32 sadhmcnt; /* max allowed hash bkts */ 951 u32 sadcnt; /* current running count */ 952 }; 953 954 struct xfrmk_spdinfo { 955 u32 incnt; 956 u32 outcnt; 957 u32 fwdcnt; 958 u32 inscnt; 959 u32 outscnt; 960 u32 fwdscnt; 961 u32 spdhcnt; 962 u32 spdhmcnt; 963 }; 964 965 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq); 966 extern int xfrm_state_delete(struct xfrm_state *x); 967 extern void xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info); 968 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si); 969 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si); 970 extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq); 971 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq); 972 extern void xfrm_replay_notify(struct xfrm_state *x, int event); 973 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb); 974 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); 975 extern int xfrm_init_state(struct xfrm_state *x); 976 extern int xfrm4_rcv(struct sk_buff *skb); 977 extern int xfrm4_output(struct sk_buff *skb); 978 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 979 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 980 extern int xfrm6_rcv_spi(struct sk_buff *skb, __be32 spi); 981 extern int xfrm6_rcv(struct sk_buff **pskb); 982 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 983 xfrm_address_t *saddr, u8 proto); 984 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 985 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 986 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr); 987 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr); 988 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr); 989 extern int xfrm6_output(struct sk_buff *skb); 990 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, 991 u8 **prevhdr); 992 993 #ifdef CONFIG_XFRM 994 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type); 995 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); 996 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family); 997 #else 998 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 999 { 1000 return -ENOPROTOOPT; 1001 } 1002 1003 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type) 1004 { 1005 /* should not happen */ 1006 kfree_skb(skb); 1007 return 0; 1008 } 1009 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family) 1010 { 1011 return -EINVAL; 1012 } 1013 #endif 1014 1015 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp); 1016 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *); 1017 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1018 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, 1019 struct xfrm_selector *sel, 1020 struct xfrm_sec_ctx *ctx, int delete, 1021 int *err); 1022 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err); 1023 void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info); 1024 u32 xfrm_get_acqseq(void); 1025 void xfrm_alloc_spi(struct xfrm_state *x, __be32 minspi, __be32 maxspi); 1026 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto, 1027 xfrm_address_t *daddr, xfrm_address_t *saddr, 1028 int create, unsigned short family); 1029 extern void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info); 1030 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1031 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst, 1032 struct flowi *fl, int family, int strict); 1033 extern void xfrm_init_pmtu(struct dst_entry *dst); 1034 1035 #ifdef CONFIG_XFRM_MIGRATE 1036 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 1037 struct xfrm_migrate *m, int num_bundles); 1038 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m); 1039 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, 1040 struct xfrm_migrate *m); 1041 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 1042 struct xfrm_migrate *m, int num_bundles); 1043 #endif 1044 1045 extern wait_queue_head_t km_waitq; 1046 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1047 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid); 1048 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 1049 1050 extern void xfrm_input_init(void); 1051 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1052 1053 extern void xfrm_probe_algs(void); 1054 extern int xfrm_count_auth_supported(void); 1055 extern int xfrm_count_enc_supported(void); 1056 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1057 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1058 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1059 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1060 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1061 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe); 1062 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe); 1063 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe); 1064 1065 struct hash_desc; 1066 struct scatterlist; 1067 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *, 1068 unsigned int); 1069 1070 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm, 1071 int offset, int len, icv_update_fn_t icv_update); 1072 1073 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b, 1074 int family) 1075 { 1076 switch (family) { 1077 default: 1078 case AF_INET: 1079 return (__force __u32)a->a4 - (__force __u32)b->a4; 1080 case AF_INET6: 1081 return ipv6_addr_cmp((struct in6_addr *)a, 1082 (struct in6_addr *)b); 1083 } 1084 } 1085 1086 static inline int xfrm_policy_id2dir(u32 index) 1087 { 1088 return index & 7; 1089 } 1090 1091 static inline int xfrm_aevent_is_on(void) 1092 { 1093 struct sock *nlsk; 1094 int ret = 0; 1095 1096 rcu_read_lock(); 1097 nlsk = rcu_dereference(xfrm_nl); 1098 if (nlsk) 1099 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1100 rcu_read_unlock(); 1101 return ret; 1102 } 1103 1104 static inline void xfrm_aevent_doreplay(struct xfrm_state *x) 1105 { 1106 if (xfrm_aevent_is_on()) 1107 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); 1108 } 1109 1110 #ifdef CONFIG_XFRM_MIGRATE 1111 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1112 { 1113 return (struct xfrm_algo *)kmemdup(orig, sizeof(*orig) + orig->alg_key_len, GFP_KERNEL); 1114 } 1115 1116 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1117 { 1118 int i; 1119 for (i = 0; i < n; i++) 1120 xfrm_state_put(*(states + i)); 1121 } 1122 1123 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1124 { 1125 int i; 1126 for (i = 0; i < n; i++) 1127 xfrm_state_delete(*(states + i)); 1128 } 1129 #endif 1130 1131 #endif /* _NET_XFRM_H */ 1132