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 dst_ops *dst_ops; 232 void (*garbage_collect)(void); 233 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl); 234 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr); 235 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy); 236 int (*bundle_create)(struct xfrm_policy *policy, 237 struct xfrm_state **xfrm, 238 int nx, 239 struct flowi *fl, 240 struct dst_entry **dst_p); 241 void (*decode_session)(struct sk_buff *skb, 242 struct flowi *fl); 243 }; 244 245 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); 246 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); 247 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c); 248 extern void km_state_notify(struct xfrm_state *x, struct km_event *c); 249 250 struct xfrm_tmpl; 251 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); 252 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid); 253 extern int __xfrm_state_delete(struct xfrm_state *x); 254 255 struct xfrm_state_afinfo { 256 unsigned int family; 257 struct module *owner; 258 struct xfrm_type *type_map[IPPROTO_MAX]; 259 struct xfrm_mode *mode_map[XFRM_MODE_MAX]; 260 int (*init_flags)(struct xfrm_state *x); 261 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl, 262 struct xfrm_tmpl *tmpl, 263 xfrm_address_t *daddr, xfrm_address_t *saddr); 264 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n); 265 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n); 266 int (*output)(struct sk_buff *skb); 267 }; 268 269 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 270 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 271 272 extern void xfrm_state_delete_tunnel(struct xfrm_state *x); 273 274 struct xfrm_type 275 { 276 char *description; 277 struct module *owner; 278 __u8 proto; 279 __u8 flags; 280 #define XFRM_TYPE_NON_FRAGMENT 1 281 #define XFRM_TYPE_REPLAY_PROT 2 282 283 int (*init_state)(struct xfrm_state *x); 284 void (*destructor)(struct xfrm_state *); 285 int (*input)(struct xfrm_state *, struct sk_buff *skb); 286 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 287 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *); 288 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **); 289 xfrm_address_t *(*local_addr)(struct xfrm_state *, xfrm_address_t *); 290 xfrm_address_t *(*remote_addr)(struct xfrm_state *, xfrm_address_t *); 291 /* Estimate maximal size of result of transformation of a dgram */ 292 u32 (*get_mtu)(struct xfrm_state *, int size); 293 }; 294 295 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family); 296 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family); 297 298 struct xfrm_mode { 299 int (*input)(struct xfrm_state *x, struct sk_buff *skb); 300 301 /* 302 * Add encapsulation header. 303 * 304 * On exit, the transport header will be set to the start of the 305 * encapsulation header to be filled in by x->type->output and 306 * the mac header will be set to the nextheader (protocol for 307 * IPv4) field of the extension header directly preceding the 308 * encapsulation header, or in its absence, that of the top IP 309 * header. The value of the network header will always point 310 * to the top IP header while skb->data will point to the payload. 311 */ 312 int (*output)(struct xfrm_state *x,struct sk_buff *skb); 313 314 struct xfrm_state_afinfo *afinfo; 315 struct module *owner; 316 unsigned int encap; 317 int flags; 318 }; 319 320 /* Flags for xfrm_mode. */ 321 enum { 322 XFRM_MODE_FLAG_TUNNEL = 1, 323 }; 324 325 extern int xfrm_register_mode(struct xfrm_mode *mode, int family); 326 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family); 327 328 struct xfrm_tmpl 329 { 330 /* id in template is interpreted as: 331 * daddr - destination of tunnel, may be zero for transport mode. 332 * spi - zero to acquire spi. Not zero if spi is static, then 333 * daddr must be fixed too. 334 * proto - AH/ESP/IPCOMP 335 */ 336 struct xfrm_id id; 337 338 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 339 xfrm_address_t saddr; 340 341 unsigned short encap_family; 342 343 __u32 reqid; 344 345 /* Mode: transport, tunnel etc. */ 346 __u8 mode; 347 348 /* Sharing mode: unique, this session only, this user only etc. */ 349 __u8 share; 350 351 /* May skip this transfomration if no SA is found */ 352 __u8 optional; 353 354 /* Bit mask of algos allowed for acquisition */ 355 __u32 aalgos; 356 __u32 ealgos; 357 __u32 calgos; 358 }; 359 360 #define XFRM_MAX_DEPTH 6 361 362 struct xfrm_policy 363 { 364 struct xfrm_policy *next; 365 struct hlist_node bydst; 366 struct hlist_node byidx; 367 368 /* This lock only affects elements except for entry. */ 369 rwlock_t lock; 370 atomic_t refcnt; 371 struct timer_list timer; 372 373 u32 priority; 374 u32 index; 375 struct xfrm_selector selector; 376 struct xfrm_lifetime_cfg lft; 377 struct xfrm_lifetime_cur curlft; 378 struct dst_entry *bundles; 379 u16 family; 380 u8 type; 381 u8 action; 382 u8 flags; 383 u8 dead; 384 u8 xfrm_nr; 385 /* XXX 1 byte hole, try to pack */ 386 struct xfrm_sec_ctx *security; 387 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 388 }; 389 390 struct xfrm_migrate { 391 xfrm_address_t old_daddr; 392 xfrm_address_t old_saddr; 393 xfrm_address_t new_daddr; 394 xfrm_address_t new_saddr; 395 u8 proto; 396 u8 mode; 397 u16 reserved; 398 u32 reqid; 399 u16 old_family; 400 u16 new_family; 401 }; 402 403 #define XFRM_KM_TIMEOUT 30 404 /* which seqno */ 405 #define XFRM_REPLAY_SEQ 1 406 #define XFRM_REPLAY_OSEQ 2 407 #define XFRM_REPLAY_SEQ_MASK 3 408 /* what happened */ 409 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 410 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 411 412 /* default aevent timeout in units of 100ms */ 413 #define XFRM_AE_ETIME 10 414 /* Async Event timer multiplier */ 415 #define XFRM_AE_ETH_M 10 416 /* default seq threshold size */ 417 #define XFRM_AE_SEQT_SIZE 2 418 419 struct xfrm_mgr 420 { 421 struct list_head list; 422 char *id; 423 int (*notify)(struct xfrm_state *x, struct km_event *c); 424 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); 425 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 426 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 427 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c); 428 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 429 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles); 430 }; 431 432 extern int xfrm_register_km(struct xfrm_mgr *km); 433 extern int xfrm_unregister_km(struct xfrm_mgr *km); 434 435 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2]; 436 437 /* 438 * This structure is used for the duration where packets are being 439 * transformed by IPsec. As soon as the packet leaves IPsec the 440 * area beyond the generic IP part may be overwritten. 441 */ 442 struct xfrm_skb_cb { 443 union { 444 struct inet_skb_parm h4; 445 struct inet6_skb_parm h6; 446 } header; 447 448 /* Sequence number for replay protection. */ 449 u64 seq; 450 }; 451 452 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) 453 454 /* Audit Information */ 455 struct xfrm_audit 456 { 457 u32 loginuid; 458 u32 secid; 459 }; 460 461 #ifdef CONFIG_AUDITSYSCALL 462 static inline struct audit_buffer *xfrm_audit_start(u32 auid, u32 sid) 463 { 464 struct audit_buffer *audit_buf = NULL; 465 char *secctx; 466 u32 secctx_len; 467 468 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, 469 AUDIT_MAC_IPSEC_EVENT); 470 if (audit_buf == NULL) 471 return NULL; 472 473 audit_log_format(audit_buf, "auid=%u", auid); 474 475 if (sid != 0 && 476 security_secid_to_secctx(sid, &secctx, &secctx_len) == 0) { 477 audit_log_format(audit_buf, " subj=%s", secctx); 478 security_release_secctx(secctx, secctx_len); 479 } else 480 audit_log_task_context(audit_buf); 481 return audit_buf; 482 } 483 484 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 485 u32 auid, u32 sid); 486 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 487 u32 auid, u32 sid); 488 extern void xfrm_audit_state_add(struct xfrm_state *x, int result, 489 u32 auid, u32 sid); 490 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result, 491 u32 auid, u32 sid); 492 #else 493 #define xfrm_audit_policy_add(x, r, a, s) do { ; } while (0) 494 #define xfrm_audit_policy_delete(x, r, a, s) do { ; } while (0) 495 #define xfrm_audit_state_add(x, r, a, s) do { ; } while (0) 496 #define xfrm_audit_state_delete(x, r, a, s) do { ; } while (0) 497 #endif /* CONFIG_AUDITSYSCALL */ 498 499 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 500 { 501 if (likely(policy != NULL)) 502 atomic_inc(&policy->refcnt); 503 } 504 505 extern void __xfrm_policy_destroy(struct xfrm_policy *policy); 506 507 static inline void xfrm_pol_put(struct xfrm_policy *policy) 508 { 509 if (atomic_dec_and_test(&policy->refcnt)) 510 __xfrm_policy_destroy(policy); 511 } 512 513 #ifdef CONFIG_XFRM_SUB_POLICY 514 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 515 { 516 int i; 517 for (i = npols - 1; i >= 0; --i) 518 xfrm_pol_put(pols[i]); 519 } 520 #else 521 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 522 { 523 xfrm_pol_put(pols[0]); 524 } 525 #endif 526 527 extern void __xfrm_state_destroy(struct xfrm_state *); 528 529 static inline void __xfrm_state_put(struct xfrm_state *x) 530 { 531 atomic_dec(&x->refcnt); 532 } 533 534 static inline void xfrm_state_put(struct xfrm_state *x) 535 { 536 if (atomic_dec_and_test(&x->refcnt)) 537 __xfrm_state_destroy(x); 538 } 539 540 static inline void xfrm_state_hold(struct xfrm_state *x) 541 { 542 atomic_inc(&x->refcnt); 543 } 544 545 static __inline__ int addr_match(void *token1, void *token2, int prefixlen) 546 { 547 __be32 *a1 = token1; 548 __be32 *a2 = token2; 549 int pdw; 550 int pbi; 551 552 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */ 553 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 554 555 if (pdw) 556 if (memcmp(a1, a2, pdw << 2)) 557 return 0; 558 559 if (pbi) { 560 __be32 mask; 561 562 mask = htonl((0xffffffff) << (32 - pbi)); 563 564 if ((a1[pdw] ^ a2[pdw]) & mask) 565 return 0; 566 } 567 568 return 1; 569 } 570 571 static __inline__ 572 __be16 xfrm_flowi_sport(struct flowi *fl) 573 { 574 __be16 port; 575 switch(fl->proto) { 576 case IPPROTO_TCP: 577 case IPPROTO_UDP: 578 case IPPROTO_UDPLITE: 579 case IPPROTO_SCTP: 580 port = fl->fl_ip_sport; 581 break; 582 case IPPROTO_ICMP: 583 case IPPROTO_ICMPV6: 584 port = htons(fl->fl_icmp_type); 585 break; 586 case IPPROTO_MH: 587 port = htons(fl->fl_mh_type); 588 break; 589 default: 590 port = 0; /*XXX*/ 591 } 592 return port; 593 } 594 595 static __inline__ 596 __be16 xfrm_flowi_dport(struct flowi *fl) 597 { 598 __be16 port; 599 switch(fl->proto) { 600 case IPPROTO_TCP: 601 case IPPROTO_UDP: 602 case IPPROTO_UDPLITE: 603 case IPPROTO_SCTP: 604 port = fl->fl_ip_dport; 605 break; 606 case IPPROTO_ICMP: 607 case IPPROTO_ICMPV6: 608 port = htons(fl->fl_icmp_code); 609 break; 610 default: 611 port = 0; /*XXX*/ 612 } 613 return port; 614 } 615 616 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, 617 unsigned short family); 618 619 #ifdef CONFIG_SECURITY_NETWORK_XFRM 620 /* If neither has a context --> match 621 * Otherwise, both must have a context and the sids, doi, alg must match 622 */ 623 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 624 { 625 return ((!s1 && !s2) || 626 (s1 && s2 && 627 (s1->ctx_sid == s2->ctx_sid) && 628 (s1->ctx_doi == s2->ctx_doi) && 629 (s1->ctx_alg == s2->ctx_alg))); 630 } 631 #else 632 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 633 { 634 return 1; 635 } 636 #endif 637 638 /* A struct encoding bundle of transformations to apply to some set of flow. 639 * 640 * dst->child points to the next element of bundle. 641 * dst->xfrm points to an instanse of transformer. 642 * 643 * Due to unfortunate limitations of current routing cache, which we 644 * have no time to fix, it mirrors struct rtable and bound to the same 645 * routing key, including saddr,daddr. However, we can have many of 646 * bundles differing by session id. All the bundles grow from a parent 647 * policy rule. 648 */ 649 struct xfrm_dst 650 { 651 union { 652 struct dst_entry dst; 653 struct rtable rt; 654 struct rt6_info rt6; 655 } u; 656 struct dst_entry *route; 657 #ifdef CONFIG_XFRM_SUB_POLICY 658 struct flowi *origin; 659 struct xfrm_selector *partner; 660 #endif 661 u32 genid; 662 u32 route_mtu_cached; 663 u32 child_mtu_cached; 664 u32 route_cookie; 665 u32 path_cookie; 666 }; 667 668 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 669 { 670 dst_release(xdst->route); 671 if (likely(xdst->u.dst.xfrm)) 672 xfrm_state_put(xdst->u.dst.xfrm); 673 #ifdef CONFIG_XFRM_SUB_POLICY 674 kfree(xdst->origin); 675 xdst->origin = NULL; 676 kfree(xdst->partner); 677 xdst->partner = NULL; 678 #endif 679 } 680 681 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 682 683 struct sec_path 684 { 685 atomic_t refcnt; 686 int len; 687 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 688 }; 689 690 static inline struct sec_path * 691 secpath_get(struct sec_path *sp) 692 { 693 if (sp) 694 atomic_inc(&sp->refcnt); 695 return sp; 696 } 697 698 extern void __secpath_destroy(struct sec_path *sp); 699 700 static inline void 701 secpath_put(struct sec_path *sp) 702 { 703 if (sp && atomic_dec_and_test(&sp->refcnt)) 704 __secpath_destroy(sp); 705 } 706 707 extern struct sec_path *secpath_dup(struct sec_path *src); 708 709 static inline void 710 secpath_reset(struct sk_buff *skb) 711 { 712 #ifdef CONFIG_XFRM 713 secpath_put(skb->sp); 714 skb->sp = NULL; 715 #endif 716 } 717 718 static inline int 719 xfrm_addr_any(xfrm_address_t *addr, unsigned short family) 720 { 721 switch (family) { 722 case AF_INET: 723 return addr->a4 == 0; 724 case AF_INET6: 725 return ipv6_addr_any((struct in6_addr *)&addr->a6); 726 } 727 return 0; 728 } 729 730 static inline int 731 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 732 { 733 return (tmpl->saddr.a4 && 734 tmpl->saddr.a4 != x->props.saddr.a4); 735 } 736 737 static inline int 738 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 739 { 740 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 741 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 742 } 743 744 static inline int 745 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family) 746 { 747 switch (family) { 748 case AF_INET: 749 return __xfrm4_state_addr_cmp(tmpl, x); 750 case AF_INET6: 751 return __xfrm6_state_addr_cmp(tmpl, x); 752 } 753 return !0; 754 } 755 756 #ifdef CONFIG_XFRM 757 758 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); 759 760 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 761 { 762 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 763 return __xfrm_policy_check(sk, dir, skb, family); 764 765 return (!xfrm_policy_count[dir] && !skb->sp) || 766 (skb->dst->flags & DST_NOPOLICY) || 767 __xfrm_policy_check(sk, dir, skb, family); 768 } 769 770 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 771 { 772 return xfrm_policy_check(sk, dir, skb, AF_INET); 773 } 774 775 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 776 { 777 return xfrm_policy_check(sk, dir, skb, AF_INET6); 778 } 779 780 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family); 781 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 782 783 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 784 { 785 return !xfrm_policy_count[XFRM_POLICY_OUT] || 786 (skb->dst->flags & DST_NOXFRM) || 787 __xfrm_route_forward(skb, family); 788 } 789 790 static inline int xfrm4_route_forward(struct sk_buff *skb) 791 { 792 return xfrm_route_forward(skb, AF_INET); 793 } 794 795 static inline int xfrm6_route_forward(struct sk_buff *skb) 796 { 797 return xfrm_route_forward(skb, AF_INET6); 798 } 799 800 extern int __xfrm_sk_clone_policy(struct sock *sk); 801 802 static inline int xfrm_sk_clone_policy(struct sock *sk) 803 { 804 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) 805 return __xfrm_sk_clone_policy(sk); 806 return 0; 807 } 808 809 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 810 811 static inline void xfrm_sk_free_policy(struct sock *sk) 812 { 813 if (unlikely(sk->sk_policy[0] != NULL)) { 814 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); 815 sk->sk_policy[0] = NULL; 816 } 817 if (unlikely(sk->sk_policy[1] != NULL)) { 818 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); 819 sk->sk_policy[1] = NULL; 820 } 821 } 822 823 #else 824 825 static inline void xfrm_sk_free_policy(struct sock *sk) {} 826 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } 827 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 828 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 829 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 830 { 831 return 1; 832 } 833 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 834 { 835 return 1; 836 } 837 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 838 { 839 return 1; 840 } 841 #endif 842 843 static __inline__ 844 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family) 845 { 846 switch (family){ 847 case AF_INET: 848 return (xfrm_address_t *)&fl->fl4_dst; 849 case AF_INET6: 850 return (xfrm_address_t *)&fl->fl6_dst; 851 } 852 return NULL; 853 } 854 855 static __inline__ 856 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family) 857 { 858 switch (family){ 859 case AF_INET: 860 return (xfrm_address_t *)&fl->fl4_src; 861 case AF_INET6: 862 return (xfrm_address_t *)&fl->fl6_src; 863 } 864 return NULL; 865 } 866 867 static __inline__ int 868 __xfrm4_state_addr_check(struct xfrm_state *x, 869 xfrm_address_t *daddr, xfrm_address_t *saddr) 870 { 871 if (daddr->a4 == x->id.daddr.a4 && 872 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 873 return 1; 874 return 0; 875 } 876 877 static __inline__ int 878 __xfrm6_state_addr_check(struct xfrm_state *x, 879 xfrm_address_t *daddr, xfrm_address_t *saddr) 880 { 881 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 882 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| 883 ipv6_addr_any((struct in6_addr *)saddr) || 884 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 885 return 1; 886 return 0; 887 } 888 889 static __inline__ int 890 xfrm_state_addr_check(struct xfrm_state *x, 891 xfrm_address_t *daddr, xfrm_address_t *saddr, 892 unsigned short family) 893 { 894 switch (family) { 895 case AF_INET: 896 return __xfrm4_state_addr_check(x, daddr, saddr); 897 case AF_INET6: 898 return __xfrm6_state_addr_check(x, daddr, saddr); 899 } 900 return 0; 901 } 902 903 static __inline__ int 904 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl, 905 unsigned short family) 906 { 907 switch (family) { 908 case AF_INET: 909 return __xfrm4_state_addr_check(x, 910 (xfrm_address_t *)&fl->fl4_dst, 911 (xfrm_address_t *)&fl->fl4_src); 912 case AF_INET6: 913 return __xfrm6_state_addr_check(x, 914 (xfrm_address_t *)&fl->fl6_dst, 915 (xfrm_address_t *)&fl->fl6_src); 916 } 917 return 0; 918 } 919 920 static inline int xfrm_state_kern(struct xfrm_state *x) 921 { 922 return atomic_read(&x->tunnel_users); 923 } 924 925 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 926 { 927 return (!userproto || proto == userproto || 928 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 929 proto == IPPROTO_ESP || 930 proto == IPPROTO_COMP))); 931 } 932 933 /* 934 * xfrm algorithm information 935 */ 936 struct xfrm_algo_auth_info { 937 u16 icv_truncbits; 938 u16 icv_fullbits; 939 }; 940 941 struct xfrm_algo_encr_info { 942 u16 blockbits; 943 u16 defkeybits; 944 }; 945 946 struct xfrm_algo_comp_info { 947 u16 threshold; 948 }; 949 950 struct xfrm_algo_desc { 951 char *name; 952 char *compat; 953 u8 available:1; 954 union { 955 struct xfrm_algo_auth_info auth; 956 struct xfrm_algo_encr_info encr; 957 struct xfrm_algo_comp_info comp; 958 } uinfo; 959 struct sadb_alg desc; 960 }; 961 962 /* XFRM tunnel handlers. */ 963 struct xfrm_tunnel { 964 int (*handler)(struct sk_buff *skb); 965 int (*err_handler)(struct sk_buff *skb, __u32 info); 966 967 struct xfrm_tunnel *next; 968 int priority; 969 }; 970 971 struct xfrm6_tunnel { 972 int (*handler)(struct sk_buff *skb); 973 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 974 int type, int code, int offset, __be32 info); 975 struct xfrm6_tunnel *next; 976 int priority; 977 }; 978 979 extern void xfrm_init(void); 980 extern void xfrm4_init(void); 981 extern void xfrm6_init(void); 982 extern void xfrm6_fini(void); 983 extern void xfrm_state_init(void); 984 extern void xfrm4_state_init(void); 985 extern void xfrm6_state_init(void); 986 extern void xfrm6_state_fini(void); 987 988 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *); 989 extern struct xfrm_state *xfrm_state_alloc(void); 990 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, 991 struct flowi *fl, struct xfrm_tmpl *tmpl, 992 struct xfrm_policy *pol, int *err, 993 unsigned short family); 994 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr, 995 xfrm_address_t *saddr, 996 unsigned short family, 997 u8 mode, u8 proto, u32 reqid); 998 extern int xfrm_state_check_expire(struct xfrm_state *x); 999 extern void xfrm_state_insert(struct xfrm_state *x); 1000 extern int xfrm_state_add(struct xfrm_state *x); 1001 extern int xfrm_state_update(struct xfrm_state *x); 1002 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family); 1003 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family); 1004 #ifdef CONFIG_XFRM_SUB_POLICY 1005 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 1006 int n, unsigned short family); 1007 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 1008 int n, unsigned short family); 1009 #else 1010 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 1011 int n, unsigned short family) 1012 { 1013 return -ENOSYS; 1014 } 1015 1016 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 1017 int n, unsigned short family) 1018 { 1019 return -ENOSYS; 1020 } 1021 #endif 1022 1023 struct xfrmk_sadinfo { 1024 u32 sadhcnt; /* current hash bkts */ 1025 u32 sadhmcnt; /* max allowed hash bkts */ 1026 u32 sadcnt; /* current running count */ 1027 }; 1028 1029 struct xfrmk_spdinfo { 1030 u32 incnt; 1031 u32 outcnt; 1032 u32 fwdcnt; 1033 u32 inscnt; 1034 u32 outscnt; 1035 u32 fwdscnt; 1036 u32 spdhcnt; 1037 u32 spdhmcnt; 1038 }; 1039 1040 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq); 1041 extern int xfrm_state_delete(struct xfrm_state *x); 1042 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info); 1043 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si); 1044 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si); 1045 extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq); 1046 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq); 1047 extern void xfrm_replay_notify(struct xfrm_state *x, int event); 1048 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); 1049 extern int xfrm_init_state(struct xfrm_state *x); 1050 extern int xfrm_output(struct sk_buff *skb); 1051 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1052 int encap_type); 1053 extern int xfrm4_rcv(struct sk_buff *skb); 1054 1055 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1056 { 1057 return xfrm4_rcv_encap(skb, nexthdr, spi, 0); 1058 } 1059 1060 extern int xfrm4_output(struct sk_buff *skb); 1061 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1062 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1063 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi); 1064 extern int xfrm6_rcv(struct sk_buff *skb); 1065 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1066 xfrm_address_t *saddr, u8 proto); 1067 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1068 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1069 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr); 1070 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr); 1071 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr); 1072 extern int xfrm6_output(struct sk_buff *skb); 1073 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, 1074 u8 **prevhdr); 1075 1076 #ifdef CONFIG_XFRM 1077 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1078 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); 1079 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family); 1080 #else 1081 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 1082 { 1083 return -ENOPROTOOPT; 1084 } 1085 1086 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb) 1087 { 1088 /* should not happen */ 1089 kfree_skb(skb); 1090 return 0; 1091 } 1092 1093 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family) 1094 { 1095 return -EINVAL; 1096 } 1097 #endif 1098 1099 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp); 1100 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *); 1101 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1102 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, 1103 struct xfrm_selector *sel, 1104 struct xfrm_sec_ctx *ctx, int delete, 1105 int *err); 1106 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err); 1107 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info); 1108 u32 xfrm_get_acqseq(void); 1109 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 1110 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto, 1111 xfrm_address_t *daddr, xfrm_address_t *saddr, 1112 int create, unsigned short family); 1113 extern int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info); 1114 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1115 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst, 1116 struct flowi *fl, int family, int strict); 1117 extern void xfrm_init_pmtu(struct dst_entry *dst); 1118 1119 #ifdef CONFIG_XFRM_MIGRATE 1120 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 1121 struct xfrm_migrate *m, int num_bundles); 1122 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m); 1123 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, 1124 struct xfrm_migrate *m); 1125 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 1126 struct xfrm_migrate *m, int num_bundles); 1127 #endif 1128 1129 extern wait_queue_head_t km_waitq; 1130 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1131 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid); 1132 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 1133 1134 extern void xfrm_input_init(void); 1135 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1136 1137 extern void xfrm_probe_algs(void); 1138 extern int xfrm_count_auth_supported(void); 1139 extern int xfrm_count_enc_supported(void); 1140 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1141 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1142 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1143 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1144 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1145 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe); 1146 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe); 1147 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe); 1148 1149 struct hash_desc; 1150 struct scatterlist; 1151 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *, 1152 unsigned int); 1153 1154 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm, 1155 int offset, int len, icv_update_fn_t icv_update); 1156 1157 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b, 1158 int family) 1159 { 1160 switch (family) { 1161 default: 1162 case AF_INET: 1163 return (__force __u32)a->a4 - (__force __u32)b->a4; 1164 case AF_INET6: 1165 return ipv6_addr_cmp((struct in6_addr *)a, 1166 (struct in6_addr *)b); 1167 } 1168 } 1169 1170 static inline int xfrm_policy_id2dir(u32 index) 1171 { 1172 return index & 7; 1173 } 1174 1175 static inline int xfrm_aevent_is_on(void) 1176 { 1177 struct sock *nlsk; 1178 int ret = 0; 1179 1180 rcu_read_lock(); 1181 nlsk = rcu_dereference(xfrm_nl); 1182 if (nlsk) 1183 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1184 rcu_read_unlock(); 1185 return ret; 1186 } 1187 1188 #ifdef CONFIG_XFRM_MIGRATE 1189 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1190 { 1191 return (struct xfrm_algo *)kmemdup(orig, sizeof(*orig) + orig->alg_key_len, GFP_KERNEL); 1192 } 1193 1194 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1195 { 1196 int i; 1197 for (i = 0; i < n; i++) 1198 xfrm_state_put(*(states + i)); 1199 } 1200 1201 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1202 { 1203 int i; 1204 for (i = 0; i < n; i++) 1205 xfrm_state_delete(*(states + i)); 1206 } 1207 #endif 1208 1209 #endif /* _NET_XFRM_H */ 1210