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 #define XFRM_ACQ_EXPIRES 30 241 242 struct xfrm_tmpl; 243 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); 244 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid); 245 extern int __xfrm_state_delete(struct xfrm_state *x); 246 247 struct xfrm_state_afinfo { 248 unsigned short family; 249 int (*init_flags)(struct xfrm_state *x); 250 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl, 251 struct xfrm_tmpl *tmpl, 252 xfrm_address_t *daddr, xfrm_address_t *saddr); 253 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n); 254 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n); 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); 259 260 extern void xfrm_state_delete_tunnel(struct xfrm_state *x); 261 262 struct xfrm_type 263 { 264 char *description; 265 struct module *owner; 266 __u8 proto; 267 __u8 flags; 268 #define XFRM_TYPE_NON_FRAGMENT 1 269 270 int (*init_state)(struct xfrm_state *x); 271 void (*destructor)(struct xfrm_state *); 272 int (*input)(struct xfrm_state *, struct sk_buff *skb); 273 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 274 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *); 275 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **); 276 xfrm_address_t *(*local_addr)(struct xfrm_state *, xfrm_address_t *); 277 xfrm_address_t *(*remote_addr)(struct xfrm_state *, xfrm_address_t *); 278 /* Estimate maximal size of result of transformation of a dgram */ 279 u32 (*get_max_size)(struct xfrm_state *, int size); 280 }; 281 282 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family); 283 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family); 284 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family); 285 extern void xfrm_put_type(struct xfrm_type *type); 286 287 struct xfrm_mode { 288 int (*input)(struct xfrm_state *x, struct sk_buff *skb); 289 int (*output)(struct xfrm_state *x,struct sk_buff *skb); 290 291 struct module *owner; 292 unsigned int encap; 293 }; 294 295 extern int xfrm_register_mode(struct xfrm_mode *mode, int family); 296 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family); 297 extern struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family); 298 extern void xfrm_put_mode(struct xfrm_mode *mode); 299 300 struct xfrm_tmpl 301 { 302 /* id in template is interpreted as: 303 * daddr - destination of tunnel, may be zero for transport mode. 304 * spi - zero to acquire spi. Not zero if spi is static, then 305 * daddr must be fixed too. 306 * proto - AH/ESP/IPCOMP 307 */ 308 struct xfrm_id id; 309 310 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 311 xfrm_address_t saddr; 312 313 unsigned short encap_family; 314 315 __u32 reqid; 316 317 /* Mode: transport, tunnel etc. */ 318 __u8 mode; 319 320 /* Sharing mode: unique, this session only, this user only etc. */ 321 __u8 share; 322 323 /* May skip this transfomration if no SA is found */ 324 __u8 optional; 325 326 /* Bit mask of algos allowed for acquisition */ 327 __u32 aalgos; 328 __u32 ealgos; 329 __u32 calgos; 330 }; 331 332 #define XFRM_MAX_DEPTH 6 333 334 struct xfrm_policy 335 { 336 struct xfrm_policy *next; 337 struct hlist_node bydst; 338 struct hlist_node byidx; 339 340 /* This lock only affects elements except for entry. */ 341 rwlock_t lock; 342 atomic_t refcnt; 343 struct timer_list timer; 344 345 u32 priority; 346 u32 index; 347 struct xfrm_selector selector; 348 struct xfrm_lifetime_cfg lft; 349 struct xfrm_lifetime_cur curlft; 350 struct dst_entry *bundles; 351 u16 family; 352 u8 type; 353 u8 action; 354 u8 flags; 355 u8 dead; 356 u8 xfrm_nr; 357 /* XXX 1 byte hole, try to pack */ 358 struct xfrm_sec_ctx *security; 359 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 360 }; 361 362 #define XFRM_KM_TIMEOUT 30 363 /* which seqno */ 364 #define XFRM_REPLAY_SEQ 1 365 #define XFRM_REPLAY_OSEQ 2 366 #define XFRM_REPLAY_SEQ_MASK 3 367 /* what happened */ 368 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 369 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 370 371 /* default aevent timeout in units of 100ms */ 372 #define XFRM_AE_ETIME 10 373 /* Async Event timer multiplier */ 374 #define XFRM_AE_ETH_M 10 375 /* default seq threshold size */ 376 #define XFRM_AE_SEQT_SIZE 2 377 378 struct xfrm_mgr 379 { 380 struct list_head list; 381 char *id; 382 int (*notify)(struct xfrm_state *x, struct km_event *c); 383 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); 384 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 385 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 386 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c); 387 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 388 }; 389 390 extern int xfrm_register_km(struct xfrm_mgr *km); 391 extern int xfrm_unregister_km(struct xfrm_mgr *km); 392 393 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2]; 394 395 /* Audit Information */ 396 struct xfrm_audit 397 { 398 uid_t loginuid; 399 u32 secid; 400 }; 401 402 #ifdef CONFIG_AUDITSYSCALL 403 extern void xfrm_audit_log(uid_t auid, u32 secid, int type, int result, 404 struct xfrm_policy *xp, struct xfrm_state *x); 405 #else 406 #define xfrm_audit_log(a,s,t,r,p,x) do { ; } while (0) 407 #endif /* CONFIG_AUDITSYSCALL */ 408 409 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 410 { 411 if (likely(policy != NULL)) 412 atomic_inc(&policy->refcnt); 413 } 414 415 extern void __xfrm_policy_destroy(struct xfrm_policy *policy); 416 417 static inline void xfrm_pol_put(struct xfrm_policy *policy) 418 { 419 if (atomic_dec_and_test(&policy->refcnt)) 420 __xfrm_policy_destroy(policy); 421 } 422 423 #ifdef CONFIG_XFRM_SUB_POLICY 424 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 425 { 426 int i; 427 for (i = npols - 1; i >= 0; --i) 428 xfrm_pol_put(pols[i]); 429 } 430 #else 431 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 432 { 433 xfrm_pol_put(pols[0]); 434 } 435 #endif 436 437 extern void __xfrm_state_destroy(struct xfrm_state *); 438 439 static inline void __xfrm_state_put(struct xfrm_state *x) 440 { 441 atomic_dec(&x->refcnt); 442 } 443 444 static inline void xfrm_state_put(struct xfrm_state *x) 445 { 446 if (atomic_dec_and_test(&x->refcnt)) 447 __xfrm_state_destroy(x); 448 } 449 450 static inline void xfrm_state_hold(struct xfrm_state *x) 451 { 452 atomic_inc(&x->refcnt); 453 } 454 455 static __inline__ int addr_match(void *token1, void *token2, int prefixlen) 456 { 457 __be32 *a1 = token1; 458 __be32 *a2 = token2; 459 int pdw; 460 int pbi; 461 462 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */ 463 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 464 465 if (pdw) 466 if (memcmp(a1, a2, pdw << 2)) 467 return 0; 468 469 if (pbi) { 470 __be32 mask; 471 472 mask = htonl((0xffffffff) << (32 - pbi)); 473 474 if ((a1[pdw] ^ a2[pdw]) & mask) 475 return 0; 476 } 477 478 return 1; 479 } 480 481 static __inline__ 482 __be16 xfrm_flowi_sport(struct flowi *fl) 483 { 484 __be16 port; 485 switch(fl->proto) { 486 case IPPROTO_TCP: 487 case IPPROTO_UDP: 488 case IPPROTO_UDPLITE: 489 case IPPROTO_SCTP: 490 port = fl->fl_ip_sport; 491 break; 492 case IPPROTO_ICMP: 493 case IPPROTO_ICMPV6: 494 port = htons(fl->fl_icmp_type); 495 break; 496 #ifdef CONFIG_IPV6_MIP6 497 case IPPROTO_MH: 498 port = htons(fl->fl_mh_type); 499 break; 500 #endif 501 default: 502 port = 0; /*XXX*/ 503 } 504 return port; 505 } 506 507 static __inline__ 508 __be16 xfrm_flowi_dport(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_dport; 517 break; 518 case IPPROTO_ICMP: 519 case IPPROTO_ICMPV6: 520 port = htons(fl->fl_icmp_code); 521 break; 522 default: 523 port = 0; /*XXX*/ 524 } 525 return port; 526 } 527 528 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, 529 unsigned short family); 530 531 #ifdef CONFIG_SECURITY_NETWORK_XFRM 532 /* If neither has a context --> match 533 * Otherwise, both must have a context and the sids, doi, alg must match 534 */ 535 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 536 { 537 return ((!s1 && !s2) || 538 (s1 && s2 && 539 (s1->ctx_sid == s2->ctx_sid) && 540 (s1->ctx_doi == s2->ctx_doi) && 541 (s1->ctx_alg == s2->ctx_alg))); 542 } 543 #else 544 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 545 { 546 return 1; 547 } 548 #endif 549 550 /* A struct encoding bundle of transformations to apply to some set of flow. 551 * 552 * dst->child points to the next element of bundle. 553 * dst->xfrm points to an instanse of transformer. 554 * 555 * Due to unfortunate limitations of current routing cache, which we 556 * have no time to fix, it mirrors struct rtable and bound to the same 557 * routing key, including saddr,daddr. However, we can have many of 558 * bundles differing by session id. All the bundles grow from a parent 559 * policy rule. 560 */ 561 struct xfrm_dst 562 { 563 union { 564 struct xfrm_dst *next; 565 struct dst_entry dst; 566 struct rtable rt; 567 struct rt6_info rt6; 568 } u; 569 struct dst_entry *route; 570 u32 genid; 571 u32 route_mtu_cached; 572 u32 child_mtu_cached; 573 u32 route_cookie; 574 u32 path_cookie; 575 }; 576 577 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 578 { 579 dst_release(xdst->route); 580 if (likely(xdst->u.dst.xfrm)) 581 xfrm_state_put(xdst->u.dst.xfrm); 582 } 583 584 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 585 586 struct sec_path 587 { 588 atomic_t refcnt; 589 int len; 590 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 591 }; 592 593 static inline struct sec_path * 594 secpath_get(struct sec_path *sp) 595 { 596 if (sp) 597 atomic_inc(&sp->refcnt); 598 return sp; 599 } 600 601 extern void __secpath_destroy(struct sec_path *sp); 602 603 static inline void 604 secpath_put(struct sec_path *sp) 605 { 606 if (sp && atomic_dec_and_test(&sp->refcnt)) 607 __secpath_destroy(sp); 608 } 609 610 extern struct sec_path *secpath_dup(struct sec_path *src); 611 612 static inline void 613 secpath_reset(struct sk_buff *skb) 614 { 615 #ifdef CONFIG_XFRM 616 secpath_put(skb->sp); 617 skb->sp = NULL; 618 #endif 619 } 620 621 static inline int 622 xfrm_addr_any(xfrm_address_t *addr, unsigned short family) 623 { 624 switch (family) { 625 case AF_INET: 626 return addr->a4 == 0; 627 case AF_INET6: 628 return ipv6_addr_any((struct in6_addr *)&addr->a6); 629 } 630 return 0; 631 } 632 633 static inline int 634 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 635 { 636 return (tmpl->saddr.a4 && 637 tmpl->saddr.a4 != x->props.saddr.a4); 638 } 639 640 static inline int 641 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 642 { 643 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 644 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 645 } 646 647 static inline int 648 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family) 649 { 650 switch (family) { 651 case AF_INET: 652 return __xfrm4_state_addr_cmp(tmpl, x); 653 case AF_INET6: 654 return __xfrm6_state_addr_cmp(tmpl, x); 655 } 656 return !0; 657 } 658 659 #ifdef CONFIG_XFRM 660 661 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); 662 663 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 664 { 665 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 666 return __xfrm_policy_check(sk, dir, skb, family); 667 668 return (!xfrm_policy_count[dir] && !skb->sp) || 669 (skb->dst->flags & DST_NOPOLICY) || 670 __xfrm_policy_check(sk, dir, skb, family); 671 } 672 673 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 674 { 675 return xfrm_policy_check(sk, dir, skb, AF_INET); 676 } 677 678 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 679 { 680 return xfrm_policy_check(sk, dir, skb, AF_INET6); 681 } 682 683 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family); 684 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 685 686 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 687 { 688 return !xfrm_policy_count[XFRM_POLICY_OUT] || 689 (skb->dst->flags & DST_NOXFRM) || 690 __xfrm_route_forward(skb, family); 691 } 692 693 static inline int xfrm4_route_forward(struct sk_buff *skb) 694 { 695 return xfrm_route_forward(skb, AF_INET); 696 } 697 698 static inline int xfrm6_route_forward(struct sk_buff *skb) 699 { 700 return xfrm_route_forward(skb, AF_INET6); 701 } 702 703 extern int __xfrm_sk_clone_policy(struct sock *sk); 704 705 static inline int xfrm_sk_clone_policy(struct sock *sk) 706 { 707 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) 708 return __xfrm_sk_clone_policy(sk); 709 return 0; 710 } 711 712 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 713 714 static inline void xfrm_sk_free_policy(struct sock *sk) 715 { 716 if (unlikely(sk->sk_policy[0] != NULL)) { 717 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); 718 sk->sk_policy[0] = NULL; 719 } 720 if (unlikely(sk->sk_policy[1] != NULL)) { 721 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); 722 sk->sk_policy[1] = NULL; 723 } 724 } 725 726 #else 727 728 static inline void xfrm_sk_free_policy(struct sock *sk) {} 729 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } 730 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 731 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 732 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 733 { 734 return 1; 735 } 736 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 737 { 738 return 1; 739 } 740 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 741 { 742 return 1; 743 } 744 #endif 745 746 static __inline__ 747 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family) 748 { 749 switch (family){ 750 case AF_INET: 751 return (xfrm_address_t *)&fl->fl4_dst; 752 case AF_INET6: 753 return (xfrm_address_t *)&fl->fl6_dst; 754 } 755 return NULL; 756 } 757 758 static __inline__ 759 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family) 760 { 761 switch (family){ 762 case AF_INET: 763 return (xfrm_address_t *)&fl->fl4_src; 764 case AF_INET6: 765 return (xfrm_address_t *)&fl->fl6_src; 766 } 767 return NULL; 768 } 769 770 static __inline__ int 771 __xfrm4_state_addr_check(struct xfrm_state *x, 772 xfrm_address_t *daddr, xfrm_address_t *saddr) 773 { 774 if (daddr->a4 == x->id.daddr.a4 && 775 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 776 return 1; 777 return 0; 778 } 779 780 static __inline__ int 781 __xfrm6_state_addr_check(struct xfrm_state *x, 782 xfrm_address_t *daddr, xfrm_address_t *saddr) 783 { 784 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 785 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| 786 ipv6_addr_any((struct in6_addr *)saddr) || 787 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 788 return 1; 789 return 0; 790 } 791 792 static __inline__ int 793 xfrm_state_addr_check(struct xfrm_state *x, 794 xfrm_address_t *daddr, xfrm_address_t *saddr, 795 unsigned short family) 796 { 797 switch (family) { 798 case AF_INET: 799 return __xfrm4_state_addr_check(x, daddr, saddr); 800 case AF_INET6: 801 return __xfrm6_state_addr_check(x, daddr, saddr); 802 } 803 return 0; 804 } 805 806 static __inline__ int 807 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl, 808 unsigned short family) 809 { 810 switch (family) { 811 case AF_INET: 812 return __xfrm4_state_addr_check(x, 813 (xfrm_address_t *)&fl->fl4_dst, 814 (xfrm_address_t *)&fl->fl4_src); 815 case AF_INET6: 816 return __xfrm6_state_addr_check(x, 817 (xfrm_address_t *)&fl->fl6_dst, 818 (xfrm_address_t *)&fl->fl6_src); 819 } 820 return 0; 821 } 822 823 static inline int xfrm_state_kern(struct xfrm_state *x) 824 { 825 return atomic_read(&x->tunnel_users); 826 } 827 828 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 829 { 830 return (!userproto || proto == userproto || 831 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 832 proto == IPPROTO_ESP || 833 proto == IPPROTO_COMP))); 834 } 835 836 /* 837 * xfrm algorithm information 838 */ 839 struct xfrm_algo_auth_info { 840 u16 icv_truncbits; 841 u16 icv_fullbits; 842 }; 843 844 struct xfrm_algo_encr_info { 845 u16 blockbits; 846 u16 defkeybits; 847 }; 848 849 struct xfrm_algo_comp_info { 850 u16 threshold; 851 }; 852 853 struct xfrm_algo_desc { 854 char *name; 855 char *compat; 856 u8 available:1; 857 union { 858 struct xfrm_algo_auth_info auth; 859 struct xfrm_algo_encr_info encr; 860 struct xfrm_algo_comp_info comp; 861 } uinfo; 862 struct sadb_alg desc; 863 }; 864 865 /* XFRM tunnel handlers. */ 866 struct xfrm_tunnel { 867 int (*handler)(struct sk_buff *skb); 868 int (*err_handler)(struct sk_buff *skb, __u32 info); 869 870 struct xfrm_tunnel *next; 871 int priority; 872 }; 873 874 struct xfrm6_tunnel { 875 int (*handler)(struct sk_buff *skb); 876 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 877 int type, int code, int offset, __be32 info); 878 struct xfrm6_tunnel *next; 879 int priority; 880 }; 881 882 extern void xfrm_init(void); 883 extern void xfrm4_init(void); 884 extern void xfrm6_init(void); 885 extern void xfrm6_fini(void); 886 extern void xfrm_state_init(void); 887 extern void xfrm4_state_init(void); 888 extern void xfrm6_state_init(void); 889 extern void xfrm6_state_fini(void); 890 891 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *); 892 extern struct xfrm_state *xfrm_state_alloc(void); 893 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, 894 struct flowi *fl, struct xfrm_tmpl *tmpl, 895 struct xfrm_policy *pol, int *err, 896 unsigned short family); 897 extern int xfrm_state_check_expire(struct xfrm_state *x); 898 extern void xfrm_state_insert(struct xfrm_state *x); 899 extern int xfrm_state_add(struct xfrm_state *x); 900 extern int xfrm_state_update(struct xfrm_state *x); 901 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family); 902 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family); 903 #ifdef CONFIG_XFRM_SUB_POLICY 904 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 905 int n, unsigned short family); 906 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 907 int n, unsigned short family); 908 #else 909 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 910 int n, unsigned short family) 911 { 912 return -ENOSYS; 913 } 914 915 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 916 int n, unsigned short family) 917 { 918 return -ENOSYS; 919 } 920 #endif 921 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq); 922 extern int xfrm_state_delete(struct xfrm_state *x); 923 extern void xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info); 924 extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq); 925 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq); 926 extern void xfrm_replay_notify(struct xfrm_state *x, int event); 927 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb); 928 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); 929 extern int xfrm_init_state(struct xfrm_state *x); 930 extern int xfrm4_rcv(struct sk_buff *skb); 931 extern int xfrm4_output(struct sk_buff *skb); 932 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler); 933 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler); 934 extern int xfrm6_rcv_spi(struct sk_buff *skb, __be32 spi); 935 extern int xfrm6_rcv(struct sk_buff **pskb); 936 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 937 xfrm_address_t *saddr, u8 proto); 938 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler); 939 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler); 940 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr); 941 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr); 942 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr); 943 extern int xfrm6_output(struct sk_buff *skb); 944 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, 945 u8 **prevhdr); 946 947 #ifdef CONFIG_XFRM 948 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type); 949 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); 950 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family); 951 #else 952 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 953 { 954 return -ENOPROTOOPT; 955 } 956 957 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type) 958 { 959 /* should not happen */ 960 kfree_skb(skb); 961 return 0; 962 } 963 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family) 964 { 965 return -EINVAL; 966 } 967 #endif 968 969 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp); 970 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *); 971 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 972 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, 973 struct xfrm_selector *sel, 974 struct xfrm_sec_ctx *ctx, int delete); 975 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete); 976 void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info); 977 u32 xfrm_get_acqseq(void); 978 void xfrm_alloc_spi(struct xfrm_state *x, __be32 minspi, __be32 maxspi); 979 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto, 980 xfrm_address_t *daddr, xfrm_address_t *saddr, 981 int create, unsigned short family); 982 extern void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info); 983 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 984 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst, 985 struct flowi *fl, int family, int strict); 986 extern void xfrm_init_pmtu(struct dst_entry *dst); 987 988 extern wait_queue_head_t km_waitq; 989 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 990 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid); 991 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 992 993 extern void xfrm_input_init(void); 994 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 995 996 extern void xfrm_probe_algs(void); 997 extern int xfrm_count_auth_supported(void); 998 extern int xfrm_count_enc_supported(void); 999 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1000 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1001 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1002 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1003 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1004 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe); 1005 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe); 1006 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe); 1007 1008 struct hash_desc; 1009 struct scatterlist; 1010 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *, 1011 unsigned int); 1012 1013 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm, 1014 int offset, int len, icv_update_fn_t icv_update); 1015 1016 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b, 1017 int family) 1018 { 1019 switch (family) { 1020 default: 1021 case AF_INET: 1022 return (__force __u32)a->a4 - (__force __u32)b->a4; 1023 case AF_INET6: 1024 return ipv6_addr_cmp((struct in6_addr *)a, 1025 (struct in6_addr *)b); 1026 } 1027 } 1028 1029 static inline int xfrm_policy_id2dir(u32 index) 1030 { 1031 return index & 7; 1032 } 1033 1034 static inline int xfrm_aevent_is_on(void) 1035 { 1036 struct sock *nlsk; 1037 int ret = 0; 1038 1039 rcu_read_lock(); 1040 nlsk = rcu_dereference(xfrm_nl); 1041 if (nlsk) 1042 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1043 rcu_read_unlock(); 1044 return ret; 1045 } 1046 1047 static inline void xfrm_aevent_doreplay(struct xfrm_state *x) 1048 { 1049 if (xfrm_aevent_is_on()) 1050 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); 1051 } 1052 1053 1054 #endif /* _NET_XFRM_H */ 1055