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 *inner_mode; 190 struct xfrm_mode *outer_mode; 191 192 /* Security context */ 193 struct xfrm_sec_ctx *security; 194 195 /* Private data of this transformer, format is opaque, 196 * interpreted by xfrm_type methods. */ 197 void *data; 198 }; 199 200 /* xflags - make enum if more show up */ 201 #define XFRM_TIME_DEFER 1 202 203 enum { 204 XFRM_STATE_VOID, 205 XFRM_STATE_ACQ, 206 XFRM_STATE_VALID, 207 XFRM_STATE_ERROR, 208 XFRM_STATE_EXPIRED, 209 XFRM_STATE_DEAD 210 }; 211 212 /* callback structure passed from either netlink or pfkey */ 213 struct km_event 214 { 215 union { 216 u32 hard; 217 u32 proto; 218 u32 byid; 219 u32 aevent; 220 u32 type; 221 } data; 222 223 u32 seq; 224 u32 pid; 225 u32 event; 226 }; 227 228 struct xfrm_type; 229 struct xfrm_dst; 230 struct xfrm_policy_afinfo { 231 unsigned short family; 232 struct dst_ops *dst_ops; 233 void (*garbage_collect)(void); 234 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl); 235 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr); 236 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy); 237 int (*bundle_create)(struct xfrm_policy *policy, 238 struct xfrm_state **xfrm, 239 int nx, 240 struct flowi *fl, 241 struct dst_entry **dst_p); 242 void (*decode_session)(struct sk_buff *skb, 243 struct flowi *fl); 244 }; 245 246 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); 247 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); 248 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c); 249 extern void km_state_notify(struct xfrm_state *x, struct km_event *c); 250 251 struct xfrm_tmpl; 252 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); 253 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid); 254 extern int __xfrm_state_delete(struct xfrm_state *x); 255 256 struct xfrm_state_afinfo { 257 unsigned int family; 258 struct module *owner; 259 struct xfrm_type *type_map[IPPROTO_MAX]; 260 struct xfrm_mode *mode_map[XFRM_MODE_MAX]; 261 int (*init_flags)(struct xfrm_state *x); 262 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl, 263 struct xfrm_tmpl *tmpl, 264 xfrm_address_t *daddr, xfrm_address_t *saddr); 265 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n); 266 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n); 267 int (*output)(struct sk_buff *skb); 268 }; 269 270 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 271 extern int xfrm_state_unregister_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); 298 299 struct xfrm_mode { 300 int (*input)(struct xfrm_state *x, struct sk_buff *skb); 301 302 /* 303 * Add encapsulation header. 304 * 305 * On exit, the transport header will be set to the start of the 306 * encapsulation header to be filled in by x->type->output and 307 * the mac header will be set to the nextheader (protocol for 308 * IPv4) field of the extension header directly preceding the 309 * encapsulation header, or in its absence, that of the top IP 310 * header. The value of the network header will always point 311 * to the top IP header while skb->data will point to the payload. 312 */ 313 int (*output)(struct xfrm_state *x,struct sk_buff *skb); 314 315 struct xfrm_state_afinfo *afinfo; 316 struct module *owner; 317 unsigned int encap; 318 int flags; 319 }; 320 321 /* Flags for xfrm_mode. */ 322 enum { 323 XFRM_MODE_FLAG_TUNNEL = 1, 324 }; 325 326 extern int xfrm_register_mode(struct xfrm_mode *mode, int family); 327 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family); 328 329 struct xfrm_tmpl 330 { 331 /* id in template is interpreted as: 332 * daddr - destination of tunnel, may be zero for transport mode. 333 * spi - zero to acquire spi. Not zero if spi is static, then 334 * daddr must be fixed too. 335 * proto - AH/ESP/IPCOMP 336 */ 337 struct xfrm_id id; 338 339 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 340 xfrm_address_t saddr; 341 342 unsigned short encap_family; 343 344 __u32 reqid; 345 346 /* Mode: transport, tunnel etc. */ 347 __u8 mode; 348 349 /* Sharing mode: unique, this session only, this user only etc. */ 350 __u8 share; 351 352 /* May skip this transfomration if no SA is found */ 353 __u8 optional; 354 355 /* Bit mask of algos allowed for acquisition */ 356 __u32 aalgos; 357 __u32 ealgos; 358 __u32 calgos; 359 }; 360 361 #define XFRM_MAX_DEPTH 6 362 363 struct xfrm_policy 364 { 365 struct xfrm_policy *next; 366 struct hlist_node bydst; 367 struct hlist_node byidx; 368 369 /* This lock only affects elements except for entry. */ 370 rwlock_t lock; 371 atomic_t refcnt; 372 struct timer_list timer; 373 374 u32 priority; 375 u32 index; 376 struct xfrm_selector selector; 377 struct xfrm_lifetime_cfg lft; 378 struct xfrm_lifetime_cur curlft; 379 struct dst_entry *bundles; 380 u16 family; 381 u8 type; 382 u8 action; 383 u8 flags; 384 u8 dead; 385 u8 xfrm_nr; 386 /* XXX 1 byte hole, try to pack */ 387 struct xfrm_sec_ctx *security; 388 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 389 }; 390 391 struct xfrm_migrate { 392 xfrm_address_t old_daddr; 393 xfrm_address_t old_saddr; 394 xfrm_address_t new_daddr; 395 xfrm_address_t new_saddr; 396 u8 proto; 397 u8 mode; 398 u16 reserved; 399 u32 reqid; 400 u16 old_family; 401 u16 new_family; 402 }; 403 404 #define XFRM_KM_TIMEOUT 30 405 /* which seqno */ 406 #define XFRM_REPLAY_SEQ 1 407 #define XFRM_REPLAY_OSEQ 2 408 #define XFRM_REPLAY_SEQ_MASK 3 409 /* what happened */ 410 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 411 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 412 413 /* default aevent timeout in units of 100ms */ 414 #define XFRM_AE_ETIME 10 415 /* Async Event timer multiplier */ 416 #define XFRM_AE_ETH_M 10 417 /* default seq threshold size */ 418 #define XFRM_AE_SEQT_SIZE 2 419 420 struct xfrm_mgr 421 { 422 struct list_head list; 423 char *id; 424 int (*notify)(struct xfrm_state *x, struct km_event *c); 425 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); 426 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 427 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 428 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c); 429 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 430 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles); 431 }; 432 433 extern int xfrm_register_km(struct xfrm_mgr *km); 434 extern int xfrm_unregister_km(struct xfrm_mgr *km); 435 436 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2]; 437 438 /* 439 * This structure is used for the duration where packets are being 440 * transformed by IPsec. As soon as the packet leaves IPsec the 441 * area beyond the generic IP part may be overwritten. 442 */ 443 struct xfrm_skb_cb { 444 union { 445 struct inet_skb_parm h4; 446 struct inet6_skb_parm h6; 447 } header; 448 449 /* Sequence number for replay protection. */ 450 u64 seq; 451 }; 452 453 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) 454 455 /* Audit Information */ 456 struct xfrm_audit 457 { 458 u32 loginuid; 459 u32 secid; 460 }; 461 462 #ifdef CONFIG_AUDITSYSCALL 463 static inline struct audit_buffer *xfrm_audit_start(u32 auid, u32 sid) 464 { 465 struct audit_buffer *audit_buf = NULL; 466 char *secctx; 467 u32 secctx_len; 468 469 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, 470 AUDIT_MAC_IPSEC_EVENT); 471 if (audit_buf == NULL) 472 return NULL; 473 474 audit_log_format(audit_buf, "auid=%u", auid); 475 476 if (sid != 0 && 477 security_secid_to_secctx(sid, &secctx, &secctx_len) == 0) { 478 audit_log_format(audit_buf, " subj=%s", secctx); 479 security_release_secctx(secctx, secctx_len); 480 } else 481 audit_log_task_context(audit_buf); 482 return audit_buf; 483 } 484 485 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 486 u32 auid, u32 sid); 487 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 488 u32 auid, u32 sid); 489 extern void xfrm_audit_state_add(struct xfrm_state *x, int result, 490 u32 auid, u32 sid); 491 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result, 492 u32 auid, u32 sid); 493 #else 494 #define xfrm_audit_policy_add(x, r, a, s) do { ; } while (0) 495 #define xfrm_audit_policy_delete(x, r, a, s) do { ; } while (0) 496 #define xfrm_audit_state_add(x, r, a, s) do { ; } while (0) 497 #define xfrm_audit_state_delete(x, r, a, s) do { ; } while (0) 498 #endif /* CONFIG_AUDITSYSCALL */ 499 500 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 501 { 502 if (likely(policy != NULL)) 503 atomic_inc(&policy->refcnt); 504 } 505 506 extern void __xfrm_policy_destroy(struct xfrm_policy *policy); 507 508 static inline void xfrm_pol_put(struct xfrm_policy *policy) 509 { 510 if (atomic_dec_and_test(&policy->refcnt)) 511 __xfrm_policy_destroy(policy); 512 } 513 514 #ifdef CONFIG_XFRM_SUB_POLICY 515 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 516 { 517 int i; 518 for (i = npols - 1; i >= 0; --i) 519 xfrm_pol_put(pols[i]); 520 } 521 #else 522 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 523 { 524 xfrm_pol_put(pols[0]); 525 } 526 #endif 527 528 extern void __xfrm_state_destroy(struct xfrm_state *); 529 530 static inline void __xfrm_state_put(struct xfrm_state *x) 531 { 532 atomic_dec(&x->refcnt); 533 } 534 535 static inline void xfrm_state_put(struct xfrm_state *x) 536 { 537 if (atomic_dec_and_test(&x->refcnt)) 538 __xfrm_state_destroy(x); 539 } 540 541 static inline void xfrm_state_hold(struct xfrm_state *x) 542 { 543 atomic_inc(&x->refcnt); 544 } 545 546 static __inline__ int addr_match(void *token1, void *token2, int prefixlen) 547 { 548 __be32 *a1 = token1; 549 __be32 *a2 = token2; 550 int pdw; 551 int pbi; 552 553 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */ 554 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 555 556 if (pdw) 557 if (memcmp(a1, a2, pdw << 2)) 558 return 0; 559 560 if (pbi) { 561 __be32 mask; 562 563 mask = htonl((0xffffffff) << (32 - pbi)); 564 565 if ((a1[pdw] ^ a2[pdw]) & mask) 566 return 0; 567 } 568 569 return 1; 570 } 571 572 static __inline__ 573 __be16 xfrm_flowi_sport(struct flowi *fl) 574 { 575 __be16 port; 576 switch(fl->proto) { 577 case IPPROTO_TCP: 578 case IPPROTO_UDP: 579 case IPPROTO_UDPLITE: 580 case IPPROTO_SCTP: 581 port = fl->fl_ip_sport; 582 break; 583 case IPPROTO_ICMP: 584 case IPPROTO_ICMPV6: 585 port = htons(fl->fl_icmp_type); 586 break; 587 case IPPROTO_MH: 588 port = htons(fl->fl_mh_type); 589 break; 590 default: 591 port = 0; /*XXX*/ 592 } 593 return port; 594 } 595 596 static __inline__ 597 __be16 xfrm_flowi_dport(struct flowi *fl) 598 { 599 __be16 port; 600 switch(fl->proto) { 601 case IPPROTO_TCP: 602 case IPPROTO_UDP: 603 case IPPROTO_UDPLITE: 604 case IPPROTO_SCTP: 605 port = fl->fl_ip_dport; 606 break; 607 case IPPROTO_ICMP: 608 case IPPROTO_ICMPV6: 609 port = htons(fl->fl_icmp_code); 610 break; 611 default: 612 port = 0; /*XXX*/ 613 } 614 return port; 615 } 616 617 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, 618 unsigned short family); 619 620 #ifdef CONFIG_SECURITY_NETWORK_XFRM 621 /* If neither has a context --> match 622 * Otherwise, both must have a context and the sids, doi, alg must match 623 */ 624 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 625 { 626 return ((!s1 && !s2) || 627 (s1 && s2 && 628 (s1->ctx_sid == s2->ctx_sid) && 629 (s1->ctx_doi == s2->ctx_doi) && 630 (s1->ctx_alg == s2->ctx_alg))); 631 } 632 #else 633 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 634 { 635 return 1; 636 } 637 #endif 638 639 /* A struct encoding bundle of transformations to apply to some set of flow. 640 * 641 * dst->child points to the next element of bundle. 642 * dst->xfrm points to an instanse of transformer. 643 * 644 * Due to unfortunate limitations of current routing cache, which we 645 * have no time to fix, it mirrors struct rtable and bound to the same 646 * routing key, including saddr,daddr. However, we can have many of 647 * bundles differing by session id. All the bundles grow from a parent 648 * policy rule. 649 */ 650 struct xfrm_dst 651 { 652 union { 653 struct dst_entry dst; 654 struct rtable rt; 655 struct rt6_info rt6; 656 } u; 657 struct dst_entry *route; 658 #ifdef CONFIG_XFRM_SUB_POLICY 659 struct flowi *origin; 660 struct xfrm_selector *partner; 661 #endif 662 u32 genid; 663 u32 route_mtu_cached; 664 u32 child_mtu_cached; 665 u32 route_cookie; 666 u32 path_cookie; 667 }; 668 669 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 670 { 671 dst_release(xdst->route); 672 if (likely(xdst->u.dst.xfrm)) 673 xfrm_state_put(xdst->u.dst.xfrm); 674 #ifdef CONFIG_XFRM_SUB_POLICY 675 kfree(xdst->origin); 676 xdst->origin = NULL; 677 kfree(xdst->partner); 678 xdst->partner = NULL; 679 #endif 680 } 681 682 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 683 684 struct sec_path 685 { 686 atomic_t refcnt; 687 int len; 688 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 689 }; 690 691 static inline struct sec_path * 692 secpath_get(struct sec_path *sp) 693 { 694 if (sp) 695 atomic_inc(&sp->refcnt); 696 return sp; 697 } 698 699 extern void __secpath_destroy(struct sec_path *sp); 700 701 static inline void 702 secpath_put(struct sec_path *sp) 703 { 704 if (sp && atomic_dec_and_test(&sp->refcnt)) 705 __secpath_destroy(sp); 706 } 707 708 extern struct sec_path *secpath_dup(struct sec_path *src); 709 710 static inline void 711 secpath_reset(struct sk_buff *skb) 712 { 713 #ifdef CONFIG_XFRM 714 secpath_put(skb->sp); 715 skb->sp = NULL; 716 #endif 717 } 718 719 static inline int 720 xfrm_addr_any(xfrm_address_t *addr, unsigned short family) 721 { 722 switch (family) { 723 case AF_INET: 724 return addr->a4 == 0; 725 case AF_INET6: 726 return ipv6_addr_any((struct in6_addr *)&addr->a6); 727 } 728 return 0; 729 } 730 731 static inline int 732 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 733 { 734 return (tmpl->saddr.a4 && 735 tmpl->saddr.a4 != x->props.saddr.a4); 736 } 737 738 static inline int 739 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 740 { 741 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 742 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 743 } 744 745 static inline int 746 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family) 747 { 748 switch (family) { 749 case AF_INET: 750 return __xfrm4_state_addr_cmp(tmpl, x); 751 case AF_INET6: 752 return __xfrm6_state_addr_cmp(tmpl, x); 753 } 754 return !0; 755 } 756 757 #ifdef CONFIG_XFRM 758 759 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); 760 761 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 762 { 763 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 764 return __xfrm_policy_check(sk, dir, skb, family); 765 766 return (!xfrm_policy_count[dir] && !skb->sp) || 767 (skb->dst->flags & DST_NOPOLICY) || 768 __xfrm_policy_check(sk, dir, skb, family); 769 } 770 771 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 772 { 773 return xfrm_policy_check(sk, dir, skb, AF_INET); 774 } 775 776 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 777 { 778 return xfrm_policy_check(sk, dir, skb, AF_INET6); 779 } 780 781 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family); 782 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 783 784 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 785 { 786 return !xfrm_policy_count[XFRM_POLICY_OUT] || 787 (skb->dst->flags & DST_NOXFRM) || 788 __xfrm_route_forward(skb, family); 789 } 790 791 static inline int xfrm4_route_forward(struct sk_buff *skb) 792 { 793 return xfrm_route_forward(skb, AF_INET); 794 } 795 796 static inline int xfrm6_route_forward(struct sk_buff *skb) 797 { 798 return xfrm_route_forward(skb, AF_INET6); 799 } 800 801 extern int __xfrm_sk_clone_policy(struct sock *sk); 802 803 static inline int xfrm_sk_clone_policy(struct sock *sk) 804 { 805 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) 806 return __xfrm_sk_clone_policy(sk); 807 return 0; 808 } 809 810 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 811 812 static inline void xfrm_sk_free_policy(struct sock *sk) 813 { 814 if (unlikely(sk->sk_policy[0] != NULL)) { 815 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); 816 sk->sk_policy[0] = NULL; 817 } 818 if (unlikely(sk->sk_policy[1] != NULL)) { 819 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); 820 sk->sk_policy[1] = NULL; 821 } 822 } 823 824 #else 825 826 static inline void xfrm_sk_free_policy(struct sock *sk) {} 827 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } 828 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 829 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 830 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 831 { 832 return 1; 833 } 834 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 835 { 836 return 1; 837 } 838 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 839 { 840 return 1; 841 } 842 #endif 843 844 static __inline__ 845 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family) 846 { 847 switch (family){ 848 case AF_INET: 849 return (xfrm_address_t *)&fl->fl4_dst; 850 case AF_INET6: 851 return (xfrm_address_t *)&fl->fl6_dst; 852 } 853 return NULL; 854 } 855 856 static __inline__ 857 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family) 858 { 859 switch (family){ 860 case AF_INET: 861 return (xfrm_address_t *)&fl->fl4_src; 862 case AF_INET6: 863 return (xfrm_address_t *)&fl->fl6_src; 864 } 865 return NULL; 866 } 867 868 static __inline__ int 869 __xfrm4_state_addr_check(struct xfrm_state *x, 870 xfrm_address_t *daddr, xfrm_address_t *saddr) 871 { 872 if (daddr->a4 == x->id.daddr.a4 && 873 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 874 return 1; 875 return 0; 876 } 877 878 static __inline__ int 879 __xfrm6_state_addr_check(struct xfrm_state *x, 880 xfrm_address_t *daddr, xfrm_address_t *saddr) 881 { 882 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 883 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| 884 ipv6_addr_any((struct in6_addr *)saddr) || 885 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 886 return 1; 887 return 0; 888 } 889 890 static __inline__ int 891 xfrm_state_addr_check(struct xfrm_state *x, 892 xfrm_address_t *daddr, xfrm_address_t *saddr, 893 unsigned short family) 894 { 895 switch (family) { 896 case AF_INET: 897 return __xfrm4_state_addr_check(x, daddr, saddr); 898 case AF_INET6: 899 return __xfrm6_state_addr_check(x, daddr, saddr); 900 } 901 return 0; 902 } 903 904 static __inline__ int 905 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl, 906 unsigned short family) 907 { 908 switch (family) { 909 case AF_INET: 910 return __xfrm4_state_addr_check(x, 911 (xfrm_address_t *)&fl->fl4_dst, 912 (xfrm_address_t *)&fl->fl4_src); 913 case AF_INET6: 914 return __xfrm6_state_addr_check(x, 915 (xfrm_address_t *)&fl->fl6_dst, 916 (xfrm_address_t *)&fl->fl6_src); 917 } 918 return 0; 919 } 920 921 static inline int xfrm_state_kern(struct xfrm_state *x) 922 { 923 return atomic_read(&x->tunnel_users); 924 } 925 926 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 927 { 928 return (!userproto || proto == userproto || 929 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 930 proto == IPPROTO_ESP || 931 proto == IPPROTO_COMP))); 932 } 933 934 /* 935 * xfrm algorithm information 936 */ 937 struct xfrm_algo_auth_info { 938 u16 icv_truncbits; 939 u16 icv_fullbits; 940 }; 941 942 struct xfrm_algo_encr_info { 943 u16 blockbits; 944 u16 defkeybits; 945 }; 946 947 struct xfrm_algo_comp_info { 948 u16 threshold; 949 }; 950 951 struct xfrm_algo_desc { 952 char *name; 953 char *compat; 954 u8 available:1; 955 union { 956 struct xfrm_algo_auth_info auth; 957 struct xfrm_algo_encr_info encr; 958 struct xfrm_algo_comp_info comp; 959 } uinfo; 960 struct sadb_alg desc; 961 }; 962 963 /* XFRM tunnel handlers. */ 964 struct xfrm_tunnel { 965 int (*handler)(struct sk_buff *skb); 966 int (*err_handler)(struct sk_buff *skb, __u32 info); 967 968 struct xfrm_tunnel *next; 969 int priority; 970 }; 971 972 struct xfrm6_tunnel { 973 int (*handler)(struct sk_buff *skb); 974 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 975 int type, int code, int offset, __be32 info); 976 struct xfrm6_tunnel *next; 977 int priority; 978 }; 979 980 extern void xfrm_init(void); 981 extern void xfrm4_init(void); 982 extern void xfrm6_init(void); 983 extern void xfrm6_fini(void); 984 extern void xfrm_state_init(void); 985 extern void xfrm4_state_init(void); 986 extern void xfrm6_state_init(void); 987 extern void xfrm6_state_fini(void); 988 989 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *); 990 extern struct xfrm_state *xfrm_state_alloc(void); 991 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, 992 struct flowi *fl, struct xfrm_tmpl *tmpl, 993 struct xfrm_policy *pol, int *err, 994 unsigned short family); 995 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr, 996 xfrm_address_t *saddr, 997 unsigned short family, 998 u8 mode, u8 proto, u32 reqid); 999 extern int xfrm_state_check_expire(struct xfrm_state *x); 1000 extern void xfrm_state_insert(struct xfrm_state *x); 1001 extern int xfrm_state_add(struct xfrm_state *x); 1002 extern int xfrm_state_update(struct xfrm_state *x); 1003 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family); 1004 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family); 1005 #ifdef CONFIG_XFRM_SUB_POLICY 1006 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 1007 int n, unsigned short family); 1008 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 1009 int n, unsigned short family); 1010 #else 1011 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 1012 int n, unsigned short family) 1013 { 1014 return -ENOSYS; 1015 } 1016 1017 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 1018 int n, unsigned short family) 1019 { 1020 return -ENOSYS; 1021 } 1022 #endif 1023 1024 struct xfrmk_sadinfo { 1025 u32 sadhcnt; /* current hash bkts */ 1026 u32 sadhmcnt; /* max allowed hash bkts */ 1027 u32 sadcnt; /* current running count */ 1028 }; 1029 1030 struct xfrmk_spdinfo { 1031 u32 incnt; 1032 u32 outcnt; 1033 u32 fwdcnt; 1034 u32 inscnt; 1035 u32 outscnt; 1036 u32 fwdscnt; 1037 u32 spdhcnt; 1038 u32 spdhmcnt; 1039 }; 1040 1041 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq); 1042 extern int xfrm_state_delete(struct xfrm_state *x); 1043 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info); 1044 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si); 1045 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si); 1046 extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq); 1047 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq); 1048 extern void xfrm_replay_notify(struct xfrm_state *x, int event); 1049 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); 1050 extern int xfrm_init_state(struct xfrm_state *x); 1051 extern int xfrm_output(struct sk_buff *skb); 1052 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1053 int encap_type); 1054 extern int xfrm4_rcv(struct sk_buff *skb); 1055 1056 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1057 { 1058 return xfrm4_rcv_encap(skb, nexthdr, spi, 0); 1059 } 1060 1061 extern int xfrm4_output(struct sk_buff *skb); 1062 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1063 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1064 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi); 1065 extern int xfrm6_rcv(struct sk_buff *skb); 1066 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1067 xfrm_address_t *saddr, u8 proto); 1068 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1069 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1070 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr); 1071 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr); 1072 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr); 1073 extern int xfrm6_output(struct sk_buff *skb); 1074 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, 1075 u8 **prevhdr); 1076 1077 #ifdef CONFIG_XFRM 1078 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1079 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); 1080 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family); 1081 #else 1082 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 1083 { 1084 return -ENOPROTOOPT; 1085 } 1086 1087 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb) 1088 { 1089 /* should not happen */ 1090 kfree_skb(skb); 1091 return 0; 1092 } 1093 1094 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family) 1095 { 1096 return -EINVAL; 1097 } 1098 #endif 1099 1100 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp); 1101 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *); 1102 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1103 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, 1104 struct xfrm_selector *sel, 1105 struct xfrm_sec_ctx *ctx, int delete, 1106 int *err); 1107 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err); 1108 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info); 1109 u32 xfrm_get_acqseq(void); 1110 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 1111 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto, 1112 xfrm_address_t *daddr, xfrm_address_t *saddr, 1113 int create, unsigned short family); 1114 extern int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info); 1115 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1116 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst, 1117 struct flowi *fl, int family, int strict); 1118 extern void xfrm_init_pmtu(struct dst_entry *dst); 1119 1120 #ifdef CONFIG_XFRM_MIGRATE 1121 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 1122 struct xfrm_migrate *m, int num_bundles); 1123 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m); 1124 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, 1125 struct xfrm_migrate *m); 1126 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 1127 struct xfrm_migrate *m, int num_bundles); 1128 #endif 1129 1130 extern wait_queue_head_t km_waitq; 1131 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1132 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid); 1133 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 1134 1135 extern void xfrm_input_init(void); 1136 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1137 1138 extern void xfrm_probe_algs(void); 1139 extern int xfrm_count_auth_supported(void); 1140 extern int xfrm_count_enc_supported(void); 1141 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1142 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1143 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1144 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1145 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1146 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe); 1147 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe); 1148 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe); 1149 1150 struct hash_desc; 1151 struct scatterlist; 1152 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *, 1153 unsigned int); 1154 1155 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm, 1156 int offset, int len, icv_update_fn_t icv_update); 1157 1158 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b, 1159 int family) 1160 { 1161 switch (family) { 1162 default: 1163 case AF_INET: 1164 return (__force __u32)a->a4 - (__force __u32)b->a4; 1165 case AF_INET6: 1166 return ipv6_addr_cmp((struct in6_addr *)a, 1167 (struct in6_addr *)b); 1168 } 1169 } 1170 1171 static inline int xfrm_policy_id2dir(u32 index) 1172 { 1173 return index & 7; 1174 } 1175 1176 static inline int xfrm_aevent_is_on(void) 1177 { 1178 struct sock *nlsk; 1179 int ret = 0; 1180 1181 rcu_read_lock(); 1182 nlsk = rcu_dereference(xfrm_nl); 1183 if (nlsk) 1184 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1185 rcu_read_unlock(); 1186 return ret; 1187 } 1188 1189 #ifdef CONFIG_XFRM_MIGRATE 1190 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1191 { 1192 return (struct xfrm_algo *)kmemdup(orig, sizeof(*orig) + orig->alg_key_len, GFP_KERNEL); 1193 } 1194 1195 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1196 { 1197 int i; 1198 for (i = 0; i < n; i++) 1199 xfrm_state_put(*(states + i)); 1200 } 1201 1202 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1203 { 1204 int i; 1205 for (i = 0; i < n; i++) 1206 xfrm_state_delete(*(states + i)); 1207 } 1208 #endif 1209 1210 #endif /* _NET_XFRM_H */ 1211