1 #ifndef _NET_XFRM_H 2 #define _NET_XFRM_H 3 4 #include <linux/compiler.h> 5 #include <linux/xfrm.h> 6 #include <linux/spinlock.h> 7 #include <linux/list.h> 8 #include <linux/skbuff.h> 9 #include <linux/netdevice.h> 10 #include <linux/crypto.h> 11 #include <linux/pfkeyv2.h> 12 #include <linux/in6.h> 13 14 #include <net/sock.h> 15 #include <net/dst.h> 16 #include <net/route.h> 17 #include <net/ipv6.h> 18 #include <net/ip6_fib.h> 19 20 #define XFRM_ALIGN8(len) (((len) + 7) & ~7) 21 22 extern struct semaphore xfrm_cfg_sem; 23 24 /* Organization of SPD aka "XFRM rules" 25 ------------------------------------ 26 27 Basic objects: 28 - policy rule, struct xfrm_policy (=SPD entry) 29 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) 30 - instance of a transformer, struct xfrm_state (=SA) 31 - template to clone xfrm_state, struct xfrm_tmpl 32 33 SPD is plain linear list of xfrm_policy rules, ordered by priority. 34 (To be compatible with existing pfkeyv2 implementations, 35 many rules with priority of 0x7fffffff are allowed to exist and 36 such rules are ordered in an unpredictable way, thanks to bsd folks.) 37 38 Lookup is plain linear search until the first match with selector. 39 40 If "action" is "block", then we prohibit the flow, otherwise: 41 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, 42 policy entry has list of up to XFRM_MAX_DEPTH transformations, 43 described by templates xfrm_tmpl. Each template is resolved 44 to a complete xfrm_state (see below) and we pack bundle of transformations 45 to a dst_entry returned to requestor. 46 47 dst -. xfrm .-> xfrm_state #1 48 |---. child .-> dst -. xfrm .-> xfrm_state #2 49 |---. child .-> dst -. xfrm .-> xfrm_state #3 50 |---. child .-> NULL 51 52 Bundles are cached at xrfm_policy struct (field ->bundles). 53 54 55 Resolution of xrfm_tmpl 56 ----------------------- 57 Template contains: 58 1. ->mode Mode: transport or tunnel 59 2. ->id.proto Protocol: AH/ESP/IPCOMP 60 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. 61 Q: allow to resolve security gateway? 62 4. ->id.spi If not zero, static SPI. 63 5. ->saddr Local tunnel endpoint, ignored for transport mode. 64 6. ->algos List of allowed algos. Plain bitmask now. 65 Q: ealgos, aalgos, calgos. What a mess... 66 7. ->share Sharing mode. 67 Q: how to implement private sharing mode? To add struct sock* to 68 flow id? 69 70 Having this template we search through SAD searching for entries 71 with appropriate mode/proto/algo, permitted by selector. 72 If no appropriate entry found, it is requested from key manager. 73 74 PROBLEMS: 75 Q: How to find all the bundles referring to a physical path for 76 PMTU discovery? Seems, dst should contain list of all parents... 77 and enter to infinite locking hierarchy disaster. 78 No! It is easier, we will not search for them, let them find us. 79 We add genid to each dst plus pointer to genid of raw IP route, 80 pmtu disc will update pmtu on raw IP route and increase its genid. 81 dst_check() will see this for top level and trigger resyncing 82 metrics. Plus, it will be made via sk->sk_dst_cache. Solved. 83 */ 84 85 /* Full description of state of transformer. */ 86 struct xfrm_state 87 { 88 /* Note: bydst is re-used during gc */ 89 struct list_head bydst; 90 struct list_head byspi; 91 92 atomic_t refcnt; 93 spinlock_t lock; 94 95 struct xfrm_id id; 96 struct xfrm_selector sel; 97 98 /* Key manger bits */ 99 struct { 100 u8 state; 101 u8 dying; 102 u32 seq; 103 } km; 104 105 /* Parameters of this state. */ 106 struct { 107 u32 reqid; 108 u8 mode; 109 u8 replay_window; 110 u8 aalgo, ealgo, calgo; 111 u8 flags; 112 u16 family; 113 xfrm_address_t saddr; 114 int header_len; 115 int trailer_len; 116 } props; 117 118 struct xfrm_lifetime_cfg lft; 119 120 /* Data for transformer */ 121 struct xfrm_algo *aalg; 122 struct xfrm_algo *ealg; 123 struct xfrm_algo *calg; 124 125 /* Data for encapsulator */ 126 struct xfrm_encap_tmpl *encap; 127 128 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 129 struct xfrm_state *tunnel; 130 131 /* If a tunnel, number of users + 1 */ 132 atomic_t tunnel_users; 133 134 /* State for replay detection */ 135 struct xfrm_replay_state replay; 136 137 /* Statistics */ 138 struct xfrm_stats stats; 139 140 struct xfrm_lifetime_cur curlft; 141 struct timer_list timer; 142 143 /* Reference to data common to all the instances of this 144 * transformer. */ 145 struct xfrm_type *type; 146 147 /* Private data of this transformer, format is opaque, 148 * interpreted by xfrm_type methods. */ 149 void *data; 150 }; 151 152 enum { 153 XFRM_STATE_VOID, 154 XFRM_STATE_ACQ, 155 XFRM_STATE_VALID, 156 XFRM_STATE_ERROR, 157 XFRM_STATE_EXPIRED, 158 XFRM_STATE_DEAD 159 }; 160 161 struct xfrm_type; 162 struct xfrm_dst; 163 struct xfrm_policy_afinfo { 164 unsigned short family; 165 rwlock_t lock; 166 struct xfrm_type_map *type_map; 167 struct dst_ops *dst_ops; 168 void (*garbage_collect)(void); 169 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl); 170 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy); 171 int (*bundle_create)(struct xfrm_policy *policy, 172 struct xfrm_state **xfrm, 173 int nx, 174 struct flowi *fl, 175 struct dst_entry **dst_p); 176 void (*decode_session)(struct sk_buff *skb, 177 struct flowi *fl); 178 }; 179 180 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); 181 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); 182 183 #define XFRM_ACQ_EXPIRES 30 184 185 struct xfrm_tmpl; 186 struct xfrm_state_afinfo { 187 unsigned short family; 188 rwlock_t lock; 189 struct list_head *state_bydst; 190 struct list_head *state_byspi; 191 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl, 192 struct xfrm_tmpl *tmpl, 193 xfrm_address_t *daddr, xfrm_address_t *saddr); 194 struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto); 195 struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto, 196 xfrm_address_t *daddr, xfrm_address_t *saddr, 197 int create); 198 }; 199 200 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 201 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 202 203 extern void xfrm_state_delete_tunnel(struct xfrm_state *x); 204 205 struct xfrm_decap_state; 206 struct xfrm_type 207 { 208 char *description; 209 struct module *owner; 210 __u8 proto; 211 212 int (*init_state)(struct xfrm_state *x, void *args); 213 void (*destructor)(struct xfrm_state *); 214 int (*input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb); 215 int (*post_input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb); 216 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 217 /* Estimate maximal size of result of transformation of a dgram */ 218 u32 (*get_max_size)(struct xfrm_state *, int size); 219 }; 220 221 struct xfrm_type_map { 222 rwlock_t lock; 223 struct xfrm_type *map[256]; 224 }; 225 226 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family); 227 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family); 228 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family); 229 extern void xfrm_put_type(struct xfrm_type *type); 230 231 struct xfrm_tmpl 232 { 233 /* id in template is interpreted as: 234 * daddr - destination of tunnel, may be zero for transport mode. 235 * spi - zero to acquire spi. Not zero if spi is static, then 236 * daddr must be fixed too. 237 * proto - AH/ESP/IPCOMP 238 */ 239 struct xfrm_id id; 240 241 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 242 xfrm_address_t saddr; 243 244 __u32 reqid; 245 246 /* Mode: transport/tunnel */ 247 __u8 mode; 248 249 /* Sharing mode: unique, this session only, this user only etc. */ 250 __u8 share; 251 252 /* May skip this transfomration if no SA is found */ 253 __u8 optional; 254 255 /* Bit mask of algos allowed for acquisition */ 256 __u32 aalgos; 257 __u32 ealgos; 258 __u32 calgos; 259 }; 260 261 #define XFRM_MAX_DEPTH 4 262 263 struct xfrm_policy 264 { 265 struct xfrm_policy *next; 266 struct list_head list; 267 268 /* This lock only affects elements except for entry. */ 269 rwlock_t lock; 270 atomic_t refcnt; 271 struct timer_list timer; 272 273 u32 priority; 274 u32 index; 275 struct xfrm_selector selector; 276 struct xfrm_lifetime_cfg lft; 277 struct xfrm_lifetime_cur curlft; 278 struct dst_entry *bundles; 279 __u16 family; 280 __u8 action; 281 __u8 flags; 282 __u8 dead; 283 __u8 xfrm_nr; 284 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 285 }; 286 287 #define XFRM_KM_TIMEOUT 30 288 289 struct xfrm_mgr 290 { 291 struct list_head list; 292 char *id; 293 int (*notify)(struct xfrm_state *x, int event); 294 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); 295 struct xfrm_policy *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir); 296 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport); 297 int (*notify_policy)(struct xfrm_policy *x, int dir, int event); 298 }; 299 300 extern int xfrm_register_km(struct xfrm_mgr *km); 301 extern int xfrm_unregister_km(struct xfrm_mgr *km); 302 303 304 extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2]; 305 306 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 307 { 308 if (likely(policy != NULL)) 309 atomic_inc(&policy->refcnt); 310 } 311 312 extern void __xfrm_policy_destroy(struct xfrm_policy *policy); 313 314 static inline void xfrm_pol_put(struct xfrm_policy *policy) 315 { 316 if (atomic_dec_and_test(&policy->refcnt)) 317 __xfrm_policy_destroy(policy); 318 } 319 320 #define XFRM_DST_HSIZE 1024 321 322 static __inline__ 323 unsigned __xfrm4_dst_hash(xfrm_address_t *addr) 324 { 325 unsigned h; 326 h = ntohl(addr->a4); 327 h = (h ^ (h>>16)) % XFRM_DST_HSIZE; 328 return h; 329 } 330 331 static __inline__ 332 unsigned __xfrm6_dst_hash(xfrm_address_t *addr) 333 { 334 unsigned h; 335 h = ntohl(addr->a6[2]^addr->a6[3]); 336 h = (h ^ (h>>16)) % XFRM_DST_HSIZE; 337 return h; 338 } 339 340 static __inline__ 341 unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family) 342 { 343 switch (family) { 344 case AF_INET: 345 return __xfrm4_dst_hash(addr); 346 case AF_INET6: 347 return __xfrm6_dst_hash(addr); 348 } 349 return 0; 350 } 351 352 static __inline__ 353 unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto) 354 { 355 unsigned h; 356 h = ntohl(addr->a4^spi^proto); 357 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE; 358 return h; 359 } 360 361 static __inline__ 362 unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto) 363 { 364 unsigned h; 365 h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto); 366 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE; 367 return h; 368 } 369 370 static __inline__ 371 unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family) 372 { 373 switch (family) { 374 case AF_INET: 375 return __xfrm4_spi_hash(addr, spi, proto); 376 case AF_INET6: 377 return __xfrm6_spi_hash(addr, spi, proto); 378 } 379 return 0; /*XXX*/ 380 } 381 382 extern void __xfrm_state_destroy(struct xfrm_state *); 383 384 static inline void xfrm_state_put(struct xfrm_state *x) 385 { 386 if (atomic_dec_and_test(&x->refcnt)) 387 __xfrm_state_destroy(x); 388 } 389 390 static inline void xfrm_state_hold(struct xfrm_state *x) 391 { 392 atomic_inc(&x->refcnt); 393 } 394 395 static __inline__ int addr_match(void *token1, void *token2, int prefixlen) 396 { 397 __u32 *a1 = token1; 398 __u32 *a2 = token2; 399 int pdw; 400 int pbi; 401 402 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */ 403 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 404 405 if (pdw) 406 if (memcmp(a1, a2, pdw << 2)) 407 return 0; 408 409 if (pbi) { 410 __u32 mask; 411 412 mask = htonl((0xffffffff) << (32 - pbi)); 413 414 if ((a1[pdw] ^ a2[pdw]) & mask) 415 return 0; 416 } 417 418 return 1; 419 } 420 421 static __inline__ 422 u16 xfrm_flowi_sport(struct flowi *fl) 423 { 424 u16 port; 425 switch(fl->proto) { 426 case IPPROTO_TCP: 427 case IPPROTO_UDP: 428 case IPPROTO_SCTP: 429 port = fl->fl_ip_sport; 430 break; 431 case IPPROTO_ICMP: 432 case IPPROTO_ICMPV6: 433 port = htons(fl->fl_icmp_type); 434 break; 435 default: 436 port = 0; /*XXX*/ 437 } 438 return port; 439 } 440 441 static __inline__ 442 u16 xfrm_flowi_dport(struct flowi *fl) 443 { 444 u16 port; 445 switch(fl->proto) { 446 case IPPROTO_TCP: 447 case IPPROTO_UDP: 448 case IPPROTO_SCTP: 449 port = fl->fl_ip_dport; 450 break; 451 case IPPROTO_ICMP: 452 case IPPROTO_ICMPV6: 453 port = htons(fl->fl_icmp_code); 454 break; 455 default: 456 port = 0; /*XXX*/ 457 } 458 return port; 459 } 460 461 static inline int 462 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) 463 { 464 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && 465 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && 466 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && 467 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && 468 (fl->proto == sel->proto || !sel->proto) && 469 (fl->oif == sel->ifindex || !sel->ifindex); 470 } 471 472 static inline int 473 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) 474 { 475 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && 476 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && 477 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && 478 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && 479 (fl->proto == sel->proto || !sel->proto) && 480 (fl->oif == sel->ifindex || !sel->ifindex); 481 } 482 483 static inline int 484 xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, 485 unsigned short family) 486 { 487 switch (family) { 488 case AF_INET: 489 return __xfrm4_selector_match(sel, fl); 490 case AF_INET6: 491 return __xfrm6_selector_match(sel, fl); 492 } 493 return 0; 494 } 495 496 /* A struct encoding bundle of transformations to apply to some set of flow. 497 * 498 * dst->child points to the next element of bundle. 499 * dst->xfrm points to an instanse of transformer. 500 * 501 * Due to unfortunate limitations of current routing cache, which we 502 * have no time to fix, it mirrors struct rtable and bound to the same 503 * routing key, including saddr,daddr. However, we can have many of 504 * bundles differing by session id. All the bundles grow from a parent 505 * policy rule. 506 */ 507 struct xfrm_dst 508 { 509 union { 510 struct xfrm_dst *next; 511 struct dst_entry dst; 512 struct rtable rt; 513 struct rt6_info rt6; 514 } u; 515 struct dst_entry *route; 516 u32 route_mtu_cached; 517 u32 child_mtu_cached; 518 u32 route_cookie; 519 u32 path_cookie; 520 }; 521 522 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 523 { 524 dst_release(xdst->route); 525 if (likely(xdst->u.dst.xfrm)) 526 xfrm_state_put(xdst->u.dst.xfrm); 527 } 528 529 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 530 531 /* Decapsulation state, used by the input to store data during 532 * decapsulation procedure, to be used later (during the policy 533 * check 534 */ 535 struct xfrm_decap_state { 536 char decap_data[20]; 537 __u16 decap_type; 538 }; 539 540 struct sec_decap_state { 541 struct xfrm_state *xvec; 542 struct xfrm_decap_state decap; 543 }; 544 545 struct sec_path 546 { 547 atomic_t refcnt; 548 int len; 549 struct sec_decap_state x[XFRM_MAX_DEPTH]; 550 }; 551 552 static inline struct sec_path * 553 secpath_get(struct sec_path *sp) 554 { 555 if (sp) 556 atomic_inc(&sp->refcnt); 557 return sp; 558 } 559 560 extern void __secpath_destroy(struct sec_path *sp); 561 562 static inline void 563 secpath_put(struct sec_path *sp) 564 { 565 if (sp && atomic_dec_and_test(&sp->refcnt)) 566 __secpath_destroy(sp); 567 } 568 569 extern struct sec_path *secpath_dup(struct sec_path *src); 570 571 static inline void 572 secpath_reset(struct sk_buff *skb) 573 { 574 #ifdef CONFIG_XFRM 575 secpath_put(skb->sp); 576 skb->sp = NULL; 577 #endif 578 } 579 580 static inline int 581 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 582 { 583 return (tmpl->saddr.a4 && 584 tmpl->saddr.a4 != x->props.saddr.a4); 585 } 586 587 static inline int 588 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 589 { 590 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 591 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 592 } 593 594 static inline int 595 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family) 596 { 597 switch (family) { 598 case AF_INET: 599 return __xfrm4_state_addr_cmp(tmpl, x); 600 case AF_INET6: 601 return __xfrm6_state_addr_cmp(tmpl, x); 602 } 603 return !0; 604 } 605 606 #ifdef CONFIG_XFRM 607 608 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); 609 610 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 611 { 612 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 613 return __xfrm_policy_check(sk, dir, skb, family); 614 615 return (!xfrm_policy_list[dir] && !skb->sp) || 616 (skb->dst->flags & DST_NOPOLICY) || 617 __xfrm_policy_check(sk, dir, skb, family); 618 } 619 620 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 621 { 622 return xfrm_policy_check(sk, dir, skb, AF_INET); 623 } 624 625 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 626 { 627 return xfrm_policy_check(sk, dir, skb, AF_INET6); 628 } 629 630 631 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 632 633 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 634 { 635 return !xfrm_policy_list[XFRM_POLICY_OUT] || 636 (skb->dst->flags & DST_NOXFRM) || 637 __xfrm_route_forward(skb, family); 638 } 639 640 static inline int xfrm4_route_forward(struct sk_buff *skb) 641 { 642 return xfrm_route_forward(skb, AF_INET); 643 } 644 645 static inline int xfrm6_route_forward(struct sk_buff *skb) 646 { 647 return xfrm_route_forward(skb, AF_INET6); 648 } 649 650 extern int __xfrm_sk_clone_policy(struct sock *sk); 651 652 static inline int xfrm_sk_clone_policy(struct sock *sk) 653 { 654 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) 655 return __xfrm_sk_clone_policy(sk); 656 return 0; 657 } 658 659 extern void xfrm_policy_delete(struct xfrm_policy *pol, int dir); 660 661 static inline void xfrm_sk_free_policy(struct sock *sk) 662 { 663 if (unlikely(sk->sk_policy[0] != NULL)) { 664 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); 665 sk->sk_policy[0] = NULL; 666 } 667 if (unlikely(sk->sk_policy[1] != NULL)) { 668 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); 669 sk->sk_policy[1] = NULL; 670 } 671 } 672 673 #else 674 675 static inline void xfrm_sk_free_policy(struct sock *sk) {} 676 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } 677 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 678 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 679 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 680 { 681 return 1; 682 } 683 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 684 { 685 return 1; 686 } 687 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 688 { 689 return 1; 690 } 691 #endif 692 693 static __inline__ 694 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family) 695 { 696 switch (family){ 697 case AF_INET: 698 return (xfrm_address_t *)&fl->fl4_dst; 699 case AF_INET6: 700 return (xfrm_address_t *)&fl->fl6_dst; 701 } 702 return NULL; 703 } 704 705 static __inline__ 706 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family) 707 { 708 switch (family){ 709 case AF_INET: 710 return (xfrm_address_t *)&fl->fl4_src; 711 case AF_INET6: 712 return (xfrm_address_t *)&fl->fl6_src; 713 } 714 return NULL; 715 } 716 717 static __inline__ int 718 __xfrm4_state_addr_check(struct xfrm_state *x, 719 xfrm_address_t *daddr, xfrm_address_t *saddr) 720 { 721 if (daddr->a4 == x->id.daddr.a4 && 722 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 723 return 1; 724 return 0; 725 } 726 727 static __inline__ int 728 __xfrm6_state_addr_check(struct xfrm_state *x, 729 xfrm_address_t *daddr, xfrm_address_t *saddr) 730 { 731 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 732 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| 733 ipv6_addr_any((struct in6_addr *)saddr) || 734 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 735 return 1; 736 return 0; 737 } 738 739 static __inline__ int 740 xfrm_state_addr_check(struct xfrm_state *x, 741 xfrm_address_t *daddr, xfrm_address_t *saddr, 742 unsigned short family) 743 { 744 switch (family) { 745 case AF_INET: 746 return __xfrm4_state_addr_check(x, daddr, saddr); 747 case AF_INET6: 748 return __xfrm6_state_addr_check(x, daddr, saddr); 749 } 750 return 0; 751 } 752 753 static inline int xfrm_state_kern(struct xfrm_state *x) 754 { 755 return atomic_read(&x->tunnel_users); 756 } 757 758 /* 759 * xfrm algorithm information 760 */ 761 struct xfrm_algo_auth_info { 762 u16 icv_truncbits; 763 u16 icv_fullbits; 764 }; 765 766 struct xfrm_algo_encr_info { 767 u16 blockbits; 768 u16 defkeybits; 769 }; 770 771 struct xfrm_algo_comp_info { 772 u16 threshold; 773 }; 774 775 struct xfrm_algo_desc { 776 char *name; 777 u8 available:1; 778 union { 779 struct xfrm_algo_auth_info auth; 780 struct xfrm_algo_encr_info encr; 781 struct xfrm_algo_comp_info comp; 782 } uinfo; 783 struct sadb_alg desc; 784 }; 785 786 /* XFRM tunnel handlers. */ 787 struct xfrm_tunnel { 788 int (*handler)(struct sk_buff *skb); 789 void (*err_handler)(struct sk_buff *skb, void *info); 790 }; 791 792 struct xfrm6_tunnel { 793 int (*handler)(struct sk_buff **pskb, unsigned int *nhoffp); 794 void (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 795 int type, int code, int offset, __u32 info); 796 }; 797 798 extern void xfrm_init(void); 799 extern void xfrm4_init(void); 800 extern void xfrm6_init(void); 801 extern void xfrm6_fini(void); 802 extern void xfrm_state_init(void); 803 extern void xfrm4_state_init(void); 804 extern void xfrm4_state_fini(void); 805 extern void xfrm6_state_init(void); 806 extern void xfrm6_state_fini(void); 807 808 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *); 809 extern struct xfrm_state *xfrm_state_alloc(void); 810 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, 811 struct flowi *fl, struct xfrm_tmpl *tmpl, 812 struct xfrm_policy *pol, int *err, 813 unsigned short family); 814 extern int xfrm_state_check_expire(struct xfrm_state *x); 815 extern void xfrm_state_insert(struct xfrm_state *x); 816 extern int xfrm_state_add(struct xfrm_state *x); 817 extern int xfrm_state_update(struct xfrm_state *x); 818 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family); 819 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq); 820 extern void xfrm_state_delete(struct xfrm_state *x); 821 extern void xfrm_state_flush(u8 proto); 822 extern int xfrm_replay_check(struct xfrm_state *x, u32 seq); 823 extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq); 824 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb); 825 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); 826 extern int xfrm4_rcv(struct sk_buff *skb); 827 extern int xfrm4_output(struct sk_buff *skb); 828 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler); 829 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler); 830 extern int xfrm6_rcv_spi(struct sk_buff **pskb, unsigned int *nhoffp, u32 spi); 831 extern int xfrm6_rcv(struct sk_buff **pskb, unsigned int *nhoffp); 832 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler); 833 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler); 834 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr); 835 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr); 836 extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr); 837 extern int xfrm6_output(struct sk_buff *skb); 838 839 #ifdef CONFIG_XFRM 840 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type); 841 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); 842 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family); 843 #else 844 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 845 { 846 return -ENOPROTOOPT; 847 } 848 849 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type) 850 { 851 /* should not happen */ 852 kfree_skb(skb); 853 return 0; 854 } 855 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family) 856 { 857 return -EINVAL; 858 } 859 #endif 860 861 struct xfrm_policy *xfrm_policy_alloc(int gfp); 862 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *); 863 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 864 struct xfrm_policy *xfrm_policy_bysel(int dir, struct xfrm_selector *sel, 865 int delete); 866 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete); 867 void xfrm_policy_flush(void); 868 u32 xfrm_get_acqseq(void); 869 void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 870 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto, 871 xfrm_address_t *daddr, xfrm_address_t *saddr, 872 int create, unsigned short family); 873 extern void xfrm_policy_flush(void); 874 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 875 extern int xfrm_flush_bundles(void); 876 extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family); 877 extern void xfrm_init_pmtu(struct dst_entry *dst); 878 879 extern wait_queue_head_t km_waitq; 880 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport); 881 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard); 882 883 extern void xfrm_input_init(void); 884 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq); 885 886 extern void xfrm_probe_algs(void); 887 extern int xfrm_count_auth_supported(void); 888 extern int xfrm_count_enc_supported(void); 889 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 890 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 891 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 892 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 893 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 894 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe); 895 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe); 896 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe); 897 898 struct crypto_tfm; 899 typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int); 900 901 extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm, 902 int offset, int len, icv_update_fn_t icv_update); 903 904 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b, 905 int family) 906 { 907 switch (family) { 908 default: 909 case AF_INET: 910 return a->a4 - b->a4; 911 case AF_INET6: 912 return ipv6_addr_cmp((struct in6_addr *)a, 913 (struct in6_addr *)b); 914 } 915 } 916 917 #endif /* _NET_XFRM_H */ 918