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/socket.h> 10 #include <linux/pfkeyv2.h> 11 #include <linux/ipsec.h> 12 #include <linux/in6.h> 13 #include <linux/mutex.h> 14 #include <linux/audit.h> 15 16 #include <net/sock.h> 17 #include <net/dst.h> 18 #include <net/ip.h> 19 #include <net/route.h> 20 #include <net/ipv6.h> 21 #include <net/ip6_fib.h> 22 23 #define XFRM_PROTO_ESP 50 24 #define XFRM_PROTO_AH 51 25 #define XFRM_PROTO_COMP 108 26 #define XFRM_PROTO_IPIP 4 27 #define XFRM_PROTO_IPV6 41 28 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING 29 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS 30 31 #define XFRM_ALIGN8(len) (((len) + 7) & ~7) 32 #define MODULE_ALIAS_XFRM_MODE(family, encap) \ 33 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap)) 34 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \ 35 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto)) 36 37 extern struct sock *xfrm_nl; 38 extern u32 sysctl_xfrm_aevent_etime; 39 extern u32 sysctl_xfrm_aevent_rseqth; 40 41 extern struct mutex xfrm_cfg_mutex; 42 43 /* Organization of SPD aka "XFRM rules" 44 ------------------------------------ 45 46 Basic objects: 47 - policy rule, struct xfrm_policy (=SPD entry) 48 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) 49 - instance of a transformer, struct xfrm_state (=SA) 50 - template to clone xfrm_state, struct xfrm_tmpl 51 52 SPD is plain linear list of xfrm_policy rules, ordered by priority. 53 (To be compatible with existing pfkeyv2 implementations, 54 many rules with priority of 0x7fffffff are allowed to exist and 55 such rules are ordered in an unpredictable way, thanks to bsd folks.) 56 57 Lookup is plain linear search until the first match with selector. 58 59 If "action" is "block", then we prohibit the flow, otherwise: 60 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, 61 policy entry has list of up to XFRM_MAX_DEPTH transformations, 62 described by templates xfrm_tmpl. Each template is resolved 63 to a complete xfrm_state (see below) and we pack bundle of transformations 64 to a dst_entry returned to requestor. 65 66 dst -. xfrm .-> xfrm_state #1 67 |---. child .-> dst -. xfrm .-> xfrm_state #2 68 |---. child .-> dst -. xfrm .-> xfrm_state #3 69 |---. child .-> NULL 70 71 Bundles are cached at xrfm_policy struct (field ->bundles). 72 73 74 Resolution of xrfm_tmpl 75 ----------------------- 76 Template contains: 77 1. ->mode Mode: transport or tunnel 78 2. ->id.proto Protocol: AH/ESP/IPCOMP 79 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. 80 Q: allow to resolve security gateway? 81 4. ->id.spi If not zero, static SPI. 82 5. ->saddr Local tunnel endpoint, ignored for transport mode. 83 6. ->algos List of allowed algos. Plain bitmask now. 84 Q: ealgos, aalgos, calgos. What a mess... 85 7. ->share Sharing mode. 86 Q: how to implement private sharing mode? To add struct sock* to 87 flow id? 88 89 Having this template we search through SAD searching for entries 90 with appropriate mode/proto/algo, permitted by selector. 91 If no appropriate entry found, it is requested from key manager. 92 93 PROBLEMS: 94 Q: How to find all the bundles referring to a physical path for 95 PMTU discovery? Seems, dst should contain list of all parents... 96 and enter to infinite locking hierarchy disaster. 97 No! It is easier, we will not search for them, let them find us. 98 We add genid to each dst plus pointer to genid of raw IP route, 99 pmtu disc will update pmtu on raw IP route and increase its genid. 100 dst_check() will see this for top level and trigger resyncing 101 metrics. Plus, it will be made via sk->sk_dst_cache. Solved. 102 */ 103 104 /* Full description of state of transformer. */ 105 struct xfrm_state 106 { 107 /* Note: bydst is re-used during gc */ 108 struct hlist_node bydst; 109 struct hlist_node bysrc; 110 struct hlist_node byspi; 111 112 atomic_t refcnt; 113 spinlock_t lock; 114 115 struct xfrm_id id; 116 struct xfrm_selector sel; 117 118 u32 genid; 119 120 /* Key manger bits */ 121 struct { 122 u8 state; 123 u8 dying; 124 u32 seq; 125 } km; 126 127 /* Parameters of this state. */ 128 struct { 129 u32 reqid; 130 u8 mode; 131 u8 replay_window; 132 u8 aalgo, ealgo, calgo; 133 u8 flags; 134 u16 family; 135 xfrm_address_t saddr; 136 int header_len; 137 int trailer_len; 138 } props; 139 140 struct xfrm_lifetime_cfg lft; 141 142 /* Data for transformer */ 143 struct xfrm_algo *aalg; 144 struct xfrm_algo *ealg; 145 struct xfrm_algo *calg; 146 147 /* Data for encapsulator */ 148 struct xfrm_encap_tmpl *encap; 149 150 /* Data for care-of address */ 151 xfrm_address_t *coaddr; 152 153 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 154 struct xfrm_state *tunnel; 155 156 /* If a tunnel, number of users + 1 */ 157 atomic_t tunnel_users; 158 159 /* State for replay detection */ 160 struct xfrm_replay_state replay; 161 162 /* Replay detection state at the time we sent the last notification */ 163 struct xfrm_replay_state preplay; 164 165 /* internal flag that only holds state for delayed aevent at the 166 * moment 167 */ 168 u32 xflags; 169 170 /* Replay detection notification settings */ 171 u32 replay_maxage; 172 u32 replay_maxdiff; 173 174 /* Replay detection notification timer */ 175 struct timer_list rtimer; 176 177 /* Statistics */ 178 struct xfrm_stats stats; 179 180 struct xfrm_lifetime_cur curlft; 181 struct timer_list timer; 182 183 /* Last used time */ 184 u64 lastused; 185 186 /* Reference to data common to all the instances of this 187 * transformer. */ 188 struct xfrm_type *type; 189 struct xfrm_mode *mode; 190 191 /* Security context */ 192 struct xfrm_sec_ctx *security; 193 194 /* Private data of this transformer, format is opaque, 195 * interpreted by xfrm_type methods. */ 196 void *data; 197 }; 198 199 /* xflags - make enum if more show up */ 200 #define XFRM_TIME_DEFER 1 201 202 enum { 203 XFRM_STATE_VOID, 204 XFRM_STATE_ACQ, 205 XFRM_STATE_VALID, 206 XFRM_STATE_ERROR, 207 XFRM_STATE_EXPIRED, 208 XFRM_STATE_DEAD 209 }; 210 211 /* callback structure passed from either netlink or pfkey */ 212 struct km_event 213 { 214 union { 215 u32 hard; 216 u32 proto; 217 u32 byid; 218 u32 aevent; 219 u32 type; 220 } data; 221 222 u32 seq; 223 u32 pid; 224 u32 event; 225 }; 226 227 struct xfrm_type; 228 struct xfrm_dst; 229 struct xfrm_policy_afinfo { 230 unsigned short family; 231 struct xfrm_type *type_map[IPPROTO_MAX]; 232 struct xfrm_mode *mode_map[XFRM_MODE_MAX]; 233 struct dst_ops *dst_ops; 234 void (*garbage_collect)(void); 235 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl); 236 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr); 237 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy); 238 int (*bundle_create)(struct xfrm_policy *policy, 239 struct xfrm_state **xfrm, 240 int nx, 241 struct flowi *fl, 242 struct dst_entry **dst_p); 243 void (*decode_session)(struct sk_buff *skb, 244 struct flowi *fl); 245 }; 246 247 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); 248 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); 249 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c); 250 extern void km_state_notify(struct xfrm_state *x, struct km_event *c); 251 252 struct xfrm_tmpl; 253 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); 254 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid); 255 extern int __xfrm_state_delete(struct xfrm_state *x); 256 257 struct xfrm_state_afinfo { 258 unsigned short family; 259 int (*init_flags)(struct xfrm_state *x); 260 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl, 261 struct xfrm_tmpl *tmpl, 262 xfrm_address_t *daddr, xfrm_address_t *saddr); 263 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n); 264 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n); 265 int (*output)(struct sk_buff *skb); 266 }; 267 268 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 269 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 270 extern struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family); 271 extern void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); 272 273 extern void xfrm_state_delete_tunnel(struct xfrm_state *x); 274 275 struct xfrm_type 276 { 277 char *description; 278 struct module *owner; 279 __u8 proto; 280 __u8 flags; 281 #define XFRM_TYPE_NON_FRAGMENT 1 282 #define XFRM_TYPE_REPLAY_PROT 2 283 284 int (*init_state)(struct xfrm_state *x); 285 void (*destructor)(struct xfrm_state *); 286 int (*input)(struct xfrm_state *, struct sk_buff *skb); 287 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 288 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *); 289 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **); 290 xfrm_address_t *(*local_addr)(struct xfrm_state *, xfrm_address_t *); 291 xfrm_address_t *(*remote_addr)(struct xfrm_state *, xfrm_address_t *); 292 /* Estimate maximal size of result of transformation of a dgram */ 293 u32 (*get_mtu)(struct xfrm_state *, int size); 294 }; 295 296 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family); 297 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family); 298 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family); 299 extern void xfrm_put_type(struct xfrm_type *type); 300 301 struct xfrm_mode { 302 int (*input)(struct xfrm_state *x, struct sk_buff *skb); 303 304 /* 305 * Add encapsulation header. 306 * 307 * On exit, the transport header will be set to the start of the 308 * encapsulation header to be filled in by x->type->output and 309 * the mac header will be set to the nextheader (protocol for 310 * IPv4) field of the extension header directly preceding the 311 * encapsulation header, or in its absence, that of the top IP 312 * header. The value of the network header will always point 313 * to the top IP header while skb->data will point to the payload. 314 */ 315 int (*output)(struct xfrm_state *x,struct sk_buff *skb); 316 317 struct module *owner; 318 unsigned int encap; 319 }; 320 321 extern int xfrm_register_mode(struct xfrm_mode *mode, int family); 322 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family); 323 extern struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family); 324 extern void xfrm_put_mode(struct xfrm_mode *mode); 325 326 struct xfrm_tmpl 327 { 328 /* id in template is interpreted as: 329 * daddr - destination of tunnel, may be zero for transport mode. 330 * spi - zero to acquire spi. Not zero if spi is static, then 331 * daddr must be fixed too. 332 * proto - AH/ESP/IPCOMP 333 */ 334 struct xfrm_id id; 335 336 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 337 xfrm_address_t saddr; 338 339 unsigned short encap_family; 340 341 __u32 reqid; 342 343 /* Mode: transport, tunnel etc. */ 344 __u8 mode; 345 346 /* Sharing mode: unique, this session only, this user only etc. */ 347 __u8 share; 348 349 /* May skip this transfomration if no SA is found */ 350 __u8 optional; 351 352 /* Bit mask of algos allowed for acquisition */ 353 __u32 aalgos; 354 __u32 ealgos; 355 __u32 calgos; 356 }; 357 358 #define XFRM_MAX_DEPTH 6 359 360 struct xfrm_policy 361 { 362 struct xfrm_policy *next; 363 struct hlist_node bydst; 364 struct hlist_node byidx; 365 366 /* This lock only affects elements except for entry. */ 367 rwlock_t lock; 368 atomic_t refcnt; 369 struct timer_list timer; 370 371 u32 priority; 372 u32 index; 373 struct xfrm_selector selector; 374 struct xfrm_lifetime_cfg lft; 375 struct xfrm_lifetime_cur curlft; 376 struct dst_entry *bundles; 377 u16 family; 378 u8 type; 379 u8 action; 380 u8 flags; 381 u8 dead; 382 u8 xfrm_nr; 383 /* XXX 1 byte hole, try to pack */ 384 struct xfrm_sec_ctx *security; 385 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 386 }; 387 388 struct xfrm_migrate { 389 xfrm_address_t old_daddr; 390 xfrm_address_t old_saddr; 391 xfrm_address_t new_daddr; 392 xfrm_address_t new_saddr; 393 u8 proto; 394 u8 mode; 395 u16 reserved; 396 u32 reqid; 397 u16 old_family; 398 u16 new_family; 399 }; 400 401 #define XFRM_KM_TIMEOUT 30 402 /* which seqno */ 403 #define XFRM_REPLAY_SEQ 1 404 #define XFRM_REPLAY_OSEQ 2 405 #define XFRM_REPLAY_SEQ_MASK 3 406 /* what happened */ 407 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 408 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 409 410 /* default aevent timeout in units of 100ms */ 411 #define XFRM_AE_ETIME 10 412 /* Async Event timer multiplier */ 413 #define XFRM_AE_ETH_M 10 414 /* default seq threshold size */ 415 #define XFRM_AE_SEQT_SIZE 2 416 417 struct xfrm_mgr 418 { 419 struct list_head list; 420 char *id; 421 int (*notify)(struct xfrm_state *x, struct km_event *c); 422 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); 423 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 424 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 425 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c); 426 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 427 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles); 428 }; 429 430 extern int xfrm_register_km(struct xfrm_mgr *km); 431 extern int xfrm_unregister_km(struct xfrm_mgr *km); 432 433 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2]; 434 435 /* 436 * This structure is used for the duration where packets are being 437 * transformed by IPsec. As soon as the packet leaves IPsec the 438 * area beyond the generic IP part may be overwritten. 439 */ 440 struct xfrm_skb_cb { 441 union { 442 struct inet_skb_parm h4; 443 struct inet6_skb_parm h6; 444 } header; 445 446 /* Sequence number for replay protection. */ 447 u64 seq; 448 }; 449 450 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) 451 452 /* Audit Information */ 453 struct xfrm_audit 454 { 455 u32 loginuid; 456 u32 secid; 457 }; 458 459 #ifdef CONFIG_AUDITSYSCALL 460 static inline struct audit_buffer *xfrm_audit_start(u32 auid, u32 sid) 461 { 462 struct audit_buffer *audit_buf = NULL; 463 char *secctx; 464 u32 secctx_len; 465 466 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, 467 AUDIT_MAC_IPSEC_EVENT); 468 if (audit_buf == NULL) 469 return NULL; 470 471 audit_log_format(audit_buf, "auid=%u", auid); 472 473 if (sid != 0 && 474 security_secid_to_secctx(sid, &secctx, &secctx_len) == 0) { 475 audit_log_format(audit_buf, " subj=%s", secctx); 476 security_release_secctx(secctx, secctx_len); 477 } else 478 audit_log_task_context(audit_buf); 479 return audit_buf; 480 } 481 482 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 483 u32 auid, u32 sid); 484 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 485 u32 auid, u32 sid); 486 extern void xfrm_audit_state_add(struct xfrm_state *x, int result, 487 u32 auid, u32 sid); 488 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result, 489 u32 auid, u32 sid); 490 #else 491 #define xfrm_audit_policy_add(x, r, a, s) do { ; } while (0) 492 #define xfrm_audit_policy_delete(x, r, a, s) do { ; } while (0) 493 #define xfrm_audit_state_add(x, r, a, s) do { ; } while (0) 494 #define xfrm_audit_state_delete(x, r, a, s) do { ; } while (0) 495 #endif /* CONFIG_AUDITSYSCALL */ 496 497 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 498 { 499 if (likely(policy != NULL)) 500 atomic_inc(&policy->refcnt); 501 } 502 503 extern void __xfrm_policy_destroy(struct xfrm_policy *policy); 504 505 static inline void xfrm_pol_put(struct xfrm_policy *policy) 506 { 507 if (atomic_dec_and_test(&policy->refcnt)) 508 __xfrm_policy_destroy(policy); 509 } 510 511 #ifdef CONFIG_XFRM_SUB_POLICY 512 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 513 { 514 int i; 515 for (i = npols - 1; i >= 0; --i) 516 xfrm_pol_put(pols[i]); 517 } 518 #else 519 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 520 { 521 xfrm_pol_put(pols[0]); 522 } 523 #endif 524 525 extern void __xfrm_state_destroy(struct xfrm_state *); 526 527 static inline void __xfrm_state_put(struct xfrm_state *x) 528 { 529 atomic_dec(&x->refcnt); 530 } 531 532 static inline void xfrm_state_put(struct xfrm_state *x) 533 { 534 if (atomic_dec_and_test(&x->refcnt)) 535 __xfrm_state_destroy(x); 536 } 537 538 static inline void xfrm_state_hold(struct xfrm_state *x) 539 { 540 atomic_inc(&x->refcnt); 541 } 542 543 static __inline__ int addr_match(void *token1, void *token2, int prefixlen) 544 { 545 __be32 *a1 = token1; 546 __be32 *a2 = token2; 547 int pdw; 548 int pbi; 549 550 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */ 551 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 552 553 if (pdw) 554 if (memcmp(a1, a2, pdw << 2)) 555 return 0; 556 557 if (pbi) { 558 __be32 mask; 559 560 mask = htonl((0xffffffff) << (32 - pbi)); 561 562 if ((a1[pdw] ^ a2[pdw]) & mask) 563 return 0; 564 } 565 566 return 1; 567 } 568 569 static __inline__ 570 __be16 xfrm_flowi_sport(struct flowi *fl) 571 { 572 __be16 port; 573 switch(fl->proto) { 574 case IPPROTO_TCP: 575 case IPPROTO_UDP: 576 case IPPROTO_UDPLITE: 577 case IPPROTO_SCTP: 578 port = fl->fl_ip_sport; 579 break; 580 case IPPROTO_ICMP: 581 case IPPROTO_ICMPV6: 582 port = htons(fl->fl_icmp_type); 583 break; 584 case IPPROTO_MH: 585 port = htons(fl->fl_mh_type); 586 break; 587 default: 588 port = 0; /*XXX*/ 589 } 590 return port; 591 } 592 593 static __inline__ 594 __be16 xfrm_flowi_dport(struct flowi *fl) 595 { 596 __be16 port; 597 switch(fl->proto) { 598 case IPPROTO_TCP: 599 case IPPROTO_UDP: 600 case IPPROTO_UDPLITE: 601 case IPPROTO_SCTP: 602 port = fl->fl_ip_dport; 603 break; 604 case IPPROTO_ICMP: 605 case IPPROTO_ICMPV6: 606 port = htons(fl->fl_icmp_code); 607 break; 608 default: 609 port = 0; /*XXX*/ 610 } 611 return port; 612 } 613 614 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, 615 unsigned short family); 616 617 #ifdef CONFIG_SECURITY_NETWORK_XFRM 618 /* If neither has a context --> match 619 * Otherwise, both must have a context and the sids, doi, alg must match 620 */ 621 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 622 { 623 return ((!s1 && !s2) || 624 (s1 && s2 && 625 (s1->ctx_sid == s2->ctx_sid) && 626 (s1->ctx_doi == s2->ctx_doi) && 627 (s1->ctx_alg == s2->ctx_alg))); 628 } 629 #else 630 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 631 { 632 return 1; 633 } 634 #endif 635 636 /* A struct encoding bundle of transformations to apply to some set of flow. 637 * 638 * dst->child points to the next element of bundle. 639 * dst->xfrm points to an instanse of transformer. 640 * 641 * Due to unfortunate limitations of current routing cache, which we 642 * have no time to fix, it mirrors struct rtable and bound to the same 643 * routing key, including saddr,daddr. However, we can have many of 644 * bundles differing by session id. All the bundles grow from a parent 645 * policy rule. 646 */ 647 struct xfrm_dst 648 { 649 union { 650 struct dst_entry dst; 651 struct rtable rt; 652 struct rt6_info rt6; 653 } u; 654 struct dst_entry *route; 655 #ifdef CONFIG_XFRM_SUB_POLICY 656 struct flowi *origin; 657 struct xfrm_selector *partner; 658 #endif 659 u32 genid; 660 u32 route_mtu_cached; 661 u32 child_mtu_cached; 662 u32 route_cookie; 663 u32 path_cookie; 664 }; 665 666 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 667 { 668 dst_release(xdst->route); 669 if (likely(xdst->u.dst.xfrm)) 670 xfrm_state_put(xdst->u.dst.xfrm); 671 #ifdef CONFIG_XFRM_SUB_POLICY 672 kfree(xdst->origin); 673 xdst->origin = NULL; 674 kfree(xdst->partner); 675 xdst->partner = NULL; 676 #endif 677 } 678 679 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 680 681 struct sec_path 682 { 683 atomic_t refcnt; 684 int len; 685 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 686 }; 687 688 static inline struct sec_path * 689 secpath_get(struct sec_path *sp) 690 { 691 if (sp) 692 atomic_inc(&sp->refcnt); 693 return sp; 694 } 695 696 extern void __secpath_destroy(struct sec_path *sp); 697 698 static inline void 699 secpath_put(struct sec_path *sp) 700 { 701 if (sp && atomic_dec_and_test(&sp->refcnt)) 702 __secpath_destroy(sp); 703 } 704 705 extern struct sec_path *secpath_dup(struct sec_path *src); 706 707 static inline void 708 secpath_reset(struct sk_buff *skb) 709 { 710 #ifdef CONFIG_XFRM 711 secpath_put(skb->sp); 712 skb->sp = NULL; 713 #endif 714 } 715 716 static inline int 717 xfrm_addr_any(xfrm_address_t *addr, unsigned short family) 718 { 719 switch (family) { 720 case AF_INET: 721 return addr->a4 == 0; 722 case AF_INET6: 723 return ipv6_addr_any((struct in6_addr *)&addr->a6); 724 } 725 return 0; 726 } 727 728 static inline int 729 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 730 { 731 return (tmpl->saddr.a4 && 732 tmpl->saddr.a4 != x->props.saddr.a4); 733 } 734 735 static inline int 736 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 737 { 738 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 739 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 740 } 741 742 static inline int 743 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family) 744 { 745 switch (family) { 746 case AF_INET: 747 return __xfrm4_state_addr_cmp(tmpl, x); 748 case AF_INET6: 749 return __xfrm6_state_addr_cmp(tmpl, x); 750 } 751 return !0; 752 } 753 754 #ifdef CONFIG_XFRM 755 756 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); 757 758 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 759 { 760 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 761 return __xfrm_policy_check(sk, dir, skb, family); 762 763 return (!xfrm_policy_count[dir] && !skb->sp) || 764 (skb->dst->flags & DST_NOPOLICY) || 765 __xfrm_policy_check(sk, dir, skb, family); 766 } 767 768 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 769 { 770 return xfrm_policy_check(sk, dir, skb, AF_INET); 771 } 772 773 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 774 { 775 return xfrm_policy_check(sk, dir, skb, AF_INET6); 776 } 777 778 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family); 779 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 780 781 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 782 { 783 return !xfrm_policy_count[XFRM_POLICY_OUT] || 784 (skb->dst->flags & DST_NOXFRM) || 785 __xfrm_route_forward(skb, family); 786 } 787 788 static inline int xfrm4_route_forward(struct sk_buff *skb) 789 { 790 return xfrm_route_forward(skb, AF_INET); 791 } 792 793 static inline int xfrm6_route_forward(struct sk_buff *skb) 794 { 795 return xfrm_route_forward(skb, AF_INET6); 796 } 797 798 extern int __xfrm_sk_clone_policy(struct sock *sk); 799 800 static inline int xfrm_sk_clone_policy(struct sock *sk) 801 { 802 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) 803 return __xfrm_sk_clone_policy(sk); 804 return 0; 805 } 806 807 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 808 809 static inline void xfrm_sk_free_policy(struct sock *sk) 810 { 811 if (unlikely(sk->sk_policy[0] != NULL)) { 812 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); 813 sk->sk_policy[0] = NULL; 814 } 815 if (unlikely(sk->sk_policy[1] != NULL)) { 816 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); 817 sk->sk_policy[1] = NULL; 818 } 819 } 820 821 #else 822 823 static inline void xfrm_sk_free_policy(struct sock *sk) {} 824 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } 825 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 826 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 827 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 828 { 829 return 1; 830 } 831 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 832 { 833 return 1; 834 } 835 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 836 { 837 return 1; 838 } 839 #endif 840 841 static __inline__ 842 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family) 843 { 844 switch (family){ 845 case AF_INET: 846 return (xfrm_address_t *)&fl->fl4_dst; 847 case AF_INET6: 848 return (xfrm_address_t *)&fl->fl6_dst; 849 } 850 return NULL; 851 } 852 853 static __inline__ 854 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family) 855 { 856 switch (family){ 857 case AF_INET: 858 return (xfrm_address_t *)&fl->fl4_src; 859 case AF_INET6: 860 return (xfrm_address_t *)&fl->fl6_src; 861 } 862 return NULL; 863 } 864 865 static __inline__ int 866 __xfrm4_state_addr_check(struct xfrm_state *x, 867 xfrm_address_t *daddr, xfrm_address_t *saddr) 868 { 869 if (daddr->a4 == x->id.daddr.a4 && 870 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 871 return 1; 872 return 0; 873 } 874 875 static __inline__ int 876 __xfrm6_state_addr_check(struct xfrm_state *x, 877 xfrm_address_t *daddr, xfrm_address_t *saddr) 878 { 879 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 880 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| 881 ipv6_addr_any((struct in6_addr *)saddr) || 882 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 883 return 1; 884 return 0; 885 } 886 887 static __inline__ int 888 xfrm_state_addr_check(struct xfrm_state *x, 889 xfrm_address_t *daddr, xfrm_address_t *saddr, 890 unsigned short family) 891 { 892 switch (family) { 893 case AF_INET: 894 return __xfrm4_state_addr_check(x, daddr, saddr); 895 case AF_INET6: 896 return __xfrm6_state_addr_check(x, daddr, saddr); 897 } 898 return 0; 899 } 900 901 static __inline__ int 902 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl, 903 unsigned short family) 904 { 905 switch (family) { 906 case AF_INET: 907 return __xfrm4_state_addr_check(x, 908 (xfrm_address_t *)&fl->fl4_dst, 909 (xfrm_address_t *)&fl->fl4_src); 910 case AF_INET6: 911 return __xfrm6_state_addr_check(x, 912 (xfrm_address_t *)&fl->fl6_dst, 913 (xfrm_address_t *)&fl->fl6_src); 914 } 915 return 0; 916 } 917 918 static inline int xfrm_state_kern(struct xfrm_state *x) 919 { 920 return atomic_read(&x->tunnel_users); 921 } 922 923 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 924 { 925 return (!userproto || proto == userproto || 926 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 927 proto == IPPROTO_ESP || 928 proto == IPPROTO_COMP))); 929 } 930 931 /* 932 * xfrm algorithm information 933 */ 934 struct xfrm_algo_auth_info { 935 u16 icv_truncbits; 936 u16 icv_fullbits; 937 }; 938 939 struct xfrm_algo_encr_info { 940 u16 blockbits; 941 u16 defkeybits; 942 }; 943 944 struct xfrm_algo_comp_info { 945 u16 threshold; 946 }; 947 948 struct xfrm_algo_desc { 949 char *name; 950 char *compat; 951 u8 available:1; 952 union { 953 struct xfrm_algo_auth_info auth; 954 struct xfrm_algo_encr_info encr; 955 struct xfrm_algo_comp_info comp; 956 } uinfo; 957 struct sadb_alg desc; 958 }; 959 960 /* XFRM tunnel handlers. */ 961 struct xfrm_tunnel { 962 int (*handler)(struct sk_buff *skb); 963 int (*err_handler)(struct sk_buff *skb, __u32 info); 964 965 struct xfrm_tunnel *next; 966 int priority; 967 }; 968 969 struct xfrm6_tunnel { 970 int (*handler)(struct sk_buff *skb); 971 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 972 int type, int code, int offset, __be32 info); 973 struct xfrm6_tunnel *next; 974 int priority; 975 }; 976 977 extern void xfrm_init(void); 978 extern void xfrm4_init(void); 979 extern void xfrm6_init(void); 980 extern void xfrm6_fini(void); 981 extern void xfrm_state_init(void); 982 extern void xfrm4_state_init(void); 983 extern void xfrm6_state_init(void); 984 extern void xfrm6_state_fini(void); 985 986 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *); 987 extern struct xfrm_state *xfrm_state_alloc(void); 988 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, 989 struct flowi *fl, struct xfrm_tmpl *tmpl, 990 struct xfrm_policy *pol, int *err, 991 unsigned short family); 992 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr, 993 xfrm_address_t *saddr, 994 unsigned short family, 995 u8 mode, u8 proto, u32 reqid); 996 extern int xfrm_state_check_expire(struct xfrm_state *x); 997 extern void xfrm_state_insert(struct xfrm_state *x); 998 extern int xfrm_state_add(struct xfrm_state *x); 999 extern int xfrm_state_update(struct xfrm_state *x); 1000 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family); 1001 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family); 1002 #ifdef CONFIG_XFRM_SUB_POLICY 1003 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 1004 int n, unsigned short family); 1005 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 1006 int n, unsigned short family); 1007 #else 1008 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 1009 int n, unsigned short family) 1010 { 1011 return -ENOSYS; 1012 } 1013 1014 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 1015 int n, unsigned short family) 1016 { 1017 return -ENOSYS; 1018 } 1019 #endif 1020 1021 struct xfrmk_sadinfo { 1022 u32 sadhcnt; /* current hash bkts */ 1023 u32 sadhmcnt; /* max allowed hash bkts */ 1024 u32 sadcnt; /* current running count */ 1025 }; 1026 1027 struct xfrmk_spdinfo { 1028 u32 incnt; 1029 u32 outcnt; 1030 u32 fwdcnt; 1031 u32 inscnt; 1032 u32 outscnt; 1033 u32 fwdscnt; 1034 u32 spdhcnt; 1035 u32 spdhmcnt; 1036 }; 1037 1038 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq); 1039 extern int xfrm_state_delete(struct xfrm_state *x); 1040 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info); 1041 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si); 1042 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si); 1043 extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq); 1044 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq); 1045 extern void xfrm_replay_notify(struct xfrm_state *x, int event); 1046 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); 1047 extern int xfrm_init_state(struct xfrm_state *x); 1048 extern int xfrm_output(struct sk_buff *skb); 1049 extern int xfrm4_rcv(struct sk_buff *skb); 1050 extern int xfrm4_output(struct sk_buff *skb); 1051 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1052 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1053 extern int xfrm6_rcv_spi(struct sk_buff *skb, __be32 spi); 1054 extern int xfrm6_rcv(struct sk_buff **pskb); 1055 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1056 xfrm_address_t *saddr, u8 proto); 1057 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1058 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1059 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr); 1060 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr); 1061 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr); 1062 extern int xfrm6_output(struct sk_buff *skb); 1063 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, 1064 u8 **prevhdr); 1065 1066 #ifdef CONFIG_XFRM 1067 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1068 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); 1069 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family); 1070 #else 1071 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 1072 { 1073 return -ENOPROTOOPT; 1074 } 1075 1076 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb) 1077 { 1078 /* should not happen */ 1079 kfree_skb(skb); 1080 return 0; 1081 } 1082 1083 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family) 1084 { 1085 return -EINVAL; 1086 } 1087 #endif 1088 1089 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp); 1090 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *); 1091 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1092 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, 1093 struct xfrm_selector *sel, 1094 struct xfrm_sec_ctx *ctx, int delete, 1095 int *err); 1096 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err); 1097 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info); 1098 u32 xfrm_get_acqseq(void); 1099 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 1100 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto, 1101 xfrm_address_t *daddr, xfrm_address_t *saddr, 1102 int create, unsigned short family); 1103 extern int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info); 1104 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1105 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst, 1106 struct flowi *fl, int family, int strict); 1107 extern void xfrm_init_pmtu(struct dst_entry *dst); 1108 1109 #ifdef CONFIG_XFRM_MIGRATE 1110 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 1111 struct xfrm_migrate *m, int num_bundles); 1112 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m); 1113 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, 1114 struct xfrm_migrate *m); 1115 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 1116 struct xfrm_migrate *m, int num_bundles); 1117 #endif 1118 1119 extern wait_queue_head_t km_waitq; 1120 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1121 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid); 1122 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 1123 1124 extern void xfrm_input_init(void); 1125 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1126 1127 extern void xfrm_probe_algs(void); 1128 extern int xfrm_count_auth_supported(void); 1129 extern int xfrm_count_enc_supported(void); 1130 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1131 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1132 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1133 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1134 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1135 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe); 1136 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe); 1137 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe); 1138 1139 struct hash_desc; 1140 struct scatterlist; 1141 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *, 1142 unsigned int); 1143 1144 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm, 1145 int offset, int len, icv_update_fn_t icv_update); 1146 1147 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b, 1148 int family) 1149 { 1150 switch (family) { 1151 default: 1152 case AF_INET: 1153 return (__force __u32)a->a4 - (__force __u32)b->a4; 1154 case AF_INET6: 1155 return ipv6_addr_cmp((struct in6_addr *)a, 1156 (struct in6_addr *)b); 1157 } 1158 } 1159 1160 static inline int xfrm_policy_id2dir(u32 index) 1161 { 1162 return index & 7; 1163 } 1164 1165 static inline int xfrm_aevent_is_on(void) 1166 { 1167 struct sock *nlsk; 1168 int ret = 0; 1169 1170 rcu_read_lock(); 1171 nlsk = rcu_dereference(xfrm_nl); 1172 if (nlsk) 1173 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1174 rcu_read_unlock(); 1175 return ret; 1176 } 1177 1178 #ifdef CONFIG_XFRM_MIGRATE 1179 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1180 { 1181 return (struct xfrm_algo *)kmemdup(orig, sizeof(*orig) + orig->alg_key_len, GFP_KERNEL); 1182 } 1183 1184 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1185 { 1186 int i; 1187 for (i = 0; i < n; i++) 1188 xfrm_state_put(*(states + i)); 1189 } 1190 1191 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1192 { 1193 int i; 1194 for (i = 0; i < n; i++) 1195 xfrm_state_delete(*(states + i)); 1196 } 1197 #endif 1198 1199 #endif /* _NET_XFRM_H */ 1200