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 #ifdef CONFIG_XFRM_STATISTICS 23 #include <net/snmp.h> 24 #endif 25 26 #define XFRM_PROTO_ESP 50 27 #define XFRM_PROTO_AH 51 28 #define XFRM_PROTO_COMP 108 29 #define XFRM_PROTO_IPIP 4 30 #define XFRM_PROTO_IPV6 41 31 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING 32 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS 33 34 #define XFRM_ALIGN8(len) (((len) + 7) & ~7) 35 #define MODULE_ALIAS_XFRM_MODE(family, encap) \ 36 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap)) 37 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \ 38 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto)) 39 40 #ifdef CONFIG_XFRM_STATISTICS 41 DECLARE_SNMP_STAT(struct linux_xfrm_mib, xfrm_statistics); 42 #define XFRM_INC_STATS(field) SNMP_INC_STATS(xfrm_statistics, field) 43 #define XFRM_INC_STATS_BH(field) SNMP_INC_STATS_BH(xfrm_statistics, field) 44 #define XFRM_INC_STATS_USER(field) SNMP_INC_STATS_USER(xfrm_statistics, field) 45 #else 46 #define XFRM_INC_STATS(field) 47 #define XFRM_INC_STATS_BH(field) 48 #define XFRM_INC_STATS_USER(field) 49 #endif 50 51 extern struct sock *xfrm_nl; 52 extern u32 sysctl_xfrm_aevent_etime; 53 extern u32 sysctl_xfrm_aevent_rseqth; 54 extern int sysctl_xfrm_larval_drop; 55 extern u32 sysctl_xfrm_acq_expires; 56 57 extern struct mutex xfrm_cfg_mutex; 58 59 /* Organization of SPD aka "XFRM rules" 60 ------------------------------------ 61 62 Basic objects: 63 - policy rule, struct xfrm_policy (=SPD entry) 64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) 65 - instance of a transformer, struct xfrm_state (=SA) 66 - template to clone xfrm_state, struct xfrm_tmpl 67 68 SPD is plain linear list of xfrm_policy rules, ordered by priority. 69 (To be compatible with existing pfkeyv2 implementations, 70 many rules with priority of 0x7fffffff are allowed to exist and 71 such rules are ordered in an unpredictable way, thanks to bsd folks.) 72 73 Lookup is plain linear search until the first match with selector. 74 75 If "action" is "block", then we prohibit the flow, otherwise: 76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, 77 policy entry has list of up to XFRM_MAX_DEPTH transformations, 78 described by templates xfrm_tmpl. Each template is resolved 79 to a complete xfrm_state (see below) and we pack bundle of transformations 80 to a dst_entry returned to requestor. 81 82 dst -. xfrm .-> xfrm_state #1 83 |---. child .-> dst -. xfrm .-> xfrm_state #2 84 |---. child .-> dst -. xfrm .-> xfrm_state #3 85 |---. child .-> NULL 86 87 Bundles are cached at xrfm_policy struct (field ->bundles). 88 89 90 Resolution of xrfm_tmpl 91 ----------------------- 92 Template contains: 93 1. ->mode Mode: transport or tunnel 94 2. ->id.proto Protocol: AH/ESP/IPCOMP 95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. 96 Q: allow to resolve security gateway? 97 4. ->id.spi If not zero, static SPI. 98 5. ->saddr Local tunnel endpoint, ignored for transport mode. 99 6. ->algos List of allowed algos. Plain bitmask now. 100 Q: ealgos, aalgos, calgos. What a mess... 101 7. ->share Sharing mode. 102 Q: how to implement private sharing mode? To add struct sock* to 103 flow id? 104 105 Having this template we search through SAD searching for entries 106 with appropriate mode/proto/algo, permitted by selector. 107 If no appropriate entry found, it is requested from key manager. 108 109 PROBLEMS: 110 Q: How to find all the bundles referring to a physical path for 111 PMTU discovery? Seems, dst should contain list of all parents... 112 and enter to infinite locking hierarchy disaster. 113 No! It is easier, we will not search for them, let them find us. 114 We add genid to each dst plus pointer to genid of raw IP route, 115 pmtu disc will update pmtu on raw IP route and increase its genid. 116 dst_check() will see this for top level and trigger resyncing 117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved. 118 */ 119 120 /* Full description of state of transformer. */ 121 struct xfrm_state 122 { 123 /* Note: bydst is re-used during gc */ 124 struct hlist_node bydst; 125 struct hlist_node bysrc; 126 struct hlist_node byspi; 127 128 atomic_t refcnt; 129 spinlock_t lock; 130 131 struct xfrm_id id; 132 struct xfrm_selector sel; 133 134 u32 genid; 135 136 /* Key manger bits */ 137 struct { 138 u8 state; 139 u8 dying; 140 u32 seq; 141 } km; 142 143 /* Parameters of this state. */ 144 struct { 145 u32 reqid; 146 u8 mode; 147 u8 replay_window; 148 u8 aalgo, ealgo, calgo; 149 u8 flags; 150 u16 family; 151 xfrm_address_t saddr; 152 int header_len; 153 int trailer_len; 154 } props; 155 156 struct xfrm_lifetime_cfg lft; 157 158 /* Data for transformer */ 159 struct xfrm_algo *aalg; 160 struct xfrm_algo *ealg; 161 struct xfrm_algo *calg; 162 struct xfrm_algo_aead *aead; 163 164 /* Data for encapsulator */ 165 struct xfrm_encap_tmpl *encap; 166 167 /* Data for care-of address */ 168 xfrm_address_t *coaddr; 169 170 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 171 struct xfrm_state *tunnel; 172 173 /* If a tunnel, number of users + 1 */ 174 atomic_t tunnel_users; 175 176 /* State for replay detection */ 177 struct xfrm_replay_state replay; 178 179 /* Replay detection state at the time we sent the last notification */ 180 struct xfrm_replay_state preplay; 181 182 /* internal flag that only holds state for delayed aevent at the 183 * moment 184 */ 185 u32 xflags; 186 187 /* Replay detection notification settings */ 188 u32 replay_maxage; 189 u32 replay_maxdiff; 190 191 /* Replay detection notification timer */ 192 struct timer_list rtimer; 193 194 /* Statistics */ 195 struct xfrm_stats stats; 196 197 struct xfrm_lifetime_cur curlft; 198 struct timer_list timer; 199 200 /* Last used time */ 201 unsigned long lastused; 202 203 /* Reference to data common to all the instances of this 204 * transformer. */ 205 const struct xfrm_type *type; 206 struct xfrm_mode *inner_mode; 207 struct xfrm_mode *outer_mode; 208 209 /* Security context */ 210 struct xfrm_sec_ctx *security; 211 212 /* Private data of this transformer, format is opaque, 213 * interpreted by xfrm_type methods. */ 214 void *data; 215 }; 216 217 /* xflags - make enum if more show up */ 218 #define XFRM_TIME_DEFER 1 219 220 enum { 221 XFRM_STATE_VOID, 222 XFRM_STATE_ACQ, 223 XFRM_STATE_VALID, 224 XFRM_STATE_ERROR, 225 XFRM_STATE_EXPIRED, 226 XFRM_STATE_DEAD 227 }; 228 229 /* callback structure passed from either netlink or pfkey */ 230 struct km_event 231 { 232 union { 233 u32 hard; 234 u32 proto; 235 u32 byid; 236 u32 aevent; 237 u32 type; 238 } data; 239 240 u32 seq; 241 u32 pid; 242 u32 event; 243 }; 244 245 struct net_device; 246 struct xfrm_type; 247 struct xfrm_dst; 248 struct xfrm_policy_afinfo { 249 unsigned short family; 250 struct dst_ops *dst_ops; 251 void (*garbage_collect)(void); 252 struct dst_entry *(*dst_lookup)(int tos, xfrm_address_t *saddr, 253 xfrm_address_t *daddr); 254 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr); 255 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy); 256 void (*decode_session)(struct sk_buff *skb, 257 struct flowi *fl, 258 int reverse); 259 int (*get_tos)(struct flowi *fl); 260 int (*init_path)(struct xfrm_dst *path, 261 struct dst_entry *dst, 262 int nfheader_len); 263 int (*fill_dst)(struct xfrm_dst *xdst, 264 struct net_device *dev); 265 }; 266 267 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); 268 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); 269 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c); 270 extern void km_state_notify(struct xfrm_state *x, struct km_event *c); 271 272 struct xfrm_tmpl; 273 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); 274 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid); 275 extern int __xfrm_state_delete(struct xfrm_state *x); 276 277 struct xfrm_state_afinfo { 278 unsigned int family; 279 unsigned int proto; 280 unsigned int eth_proto; 281 struct module *owner; 282 const struct xfrm_type *type_map[IPPROTO_MAX]; 283 struct xfrm_mode *mode_map[XFRM_MODE_MAX]; 284 int (*init_flags)(struct xfrm_state *x); 285 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl, 286 struct xfrm_tmpl *tmpl, 287 xfrm_address_t *daddr, xfrm_address_t *saddr); 288 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n); 289 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n); 290 int (*output)(struct sk_buff *skb); 291 int (*extract_input)(struct xfrm_state *x, 292 struct sk_buff *skb); 293 int (*extract_output)(struct xfrm_state *x, 294 struct sk_buff *skb); 295 int (*transport_finish)(struct sk_buff *skb, 296 int async); 297 }; 298 299 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 300 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 301 302 extern void xfrm_state_delete_tunnel(struct xfrm_state *x); 303 304 struct xfrm_type 305 { 306 char *description; 307 struct module *owner; 308 __u8 proto; 309 __u8 flags; 310 #define XFRM_TYPE_NON_FRAGMENT 1 311 #define XFRM_TYPE_REPLAY_PROT 2 312 #define XFRM_TYPE_LOCAL_COADDR 4 313 #define XFRM_TYPE_REMOTE_COADDR 8 314 315 int (*init_state)(struct xfrm_state *x); 316 void (*destructor)(struct xfrm_state *); 317 int (*input)(struct xfrm_state *, struct sk_buff *skb); 318 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 319 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *); 320 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **); 321 /* Estimate maximal size of result of transformation of a dgram */ 322 u32 (*get_mtu)(struct xfrm_state *, int size); 323 }; 324 325 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family); 326 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); 327 328 struct xfrm_mode { 329 /* 330 * Remove encapsulation header. 331 * 332 * The IP header will be moved over the top of the encapsulation 333 * header. 334 * 335 * On entry, the transport header shall point to where the IP header 336 * should be and the network header shall be set to where the IP 337 * header currently is. skb->data shall point to the start of the 338 * payload. 339 */ 340 int (*input2)(struct xfrm_state *x, struct sk_buff *skb); 341 342 /* 343 * This is the actual input entry point. 344 * 345 * For transport mode and equivalent this would be identical to 346 * input2 (which does not need to be set). While tunnel mode 347 * and equivalent would set this to the tunnel encapsulation function 348 * xfrm4_prepare_input that would in turn call input2. 349 */ 350 int (*input)(struct xfrm_state *x, struct sk_buff *skb); 351 352 /* 353 * Add encapsulation header. 354 * 355 * On exit, the transport header will be set to the start of the 356 * encapsulation header to be filled in by x->type->output and 357 * the mac header will be set to the nextheader (protocol for 358 * IPv4) field of the extension header directly preceding the 359 * encapsulation header, or in its absence, that of the top IP 360 * header. The value of the network header will always point 361 * to the top IP header while skb->data will point to the payload. 362 */ 363 int (*output2)(struct xfrm_state *x,struct sk_buff *skb); 364 365 /* 366 * This is the actual output entry point. 367 * 368 * For transport mode and equivalent this would be identical to 369 * output2 (which does not need to be set). While tunnel mode 370 * and equivalent would set this to a tunnel encapsulation function 371 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn 372 * call output2. 373 */ 374 int (*output)(struct xfrm_state *x, struct sk_buff *skb); 375 376 struct xfrm_state_afinfo *afinfo; 377 struct module *owner; 378 unsigned int encap; 379 int flags; 380 }; 381 382 /* Flags for xfrm_mode. */ 383 enum { 384 XFRM_MODE_FLAG_TUNNEL = 1, 385 }; 386 387 extern int xfrm_register_mode(struct xfrm_mode *mode, int family); 388 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family); 389 390 struct xfrm_tmpl 391 { 392 /* id in template is interpreted as: 393 * daddr - destination of tunnel, may be zero for transport mode. 394 * spi - zero to acquire spi. Not zero if spi is static, then 395 * daddr must be fixed too. 396 * proto - AH/ESP/IPCOMP 397 */ 398 struct xfrm_id id; 399 400 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 401 xfrm_address_t saddr; 402 403 unsigned short encap_family; 404 405 __u32 reqid; 406 407 /* Mode: transport, tunnel etc. */ 408 __u8 mode; 409 410 /* Sharing mode: unique, this session only, this user only etc. */ 411 __u8 share; 412 413 /* May skip this transfomration if no SA is found */ 414 __u8 optional; 415 416 /* Bit mask of algos allowed for acquisition */ 417 __u32 aalgos; 418 __u32 ealgos; 419 __u32 calgos; 420 }; 421 422 #define XFRM_MAX_DEPTH 6 423 424 struct xfrm_policy 425 { 426 struct xfrm_policy *next; 427 struct hlist_node bydst; 428 struct hlist_node byidx; 429 430 /* This lock only affects elements except for entry. */ 431 rwlock_t lock; 432 atomic_t refcnt; 433 struct timer_list timer; 434 435 u32 priority; 436 u32 index; 437 struct xfrm_selector selector; 438 struct xfrm_lifetime_cfg lft; 439 struct xfrm_lifetime_cur curlft; 440 struct dst_entry *bundles; 441 u16 family; 442 u8 type; 443 u8 action; 444 u8 flags; 445 u8 dead; 446 u8 xfrm_nr; 447 /* XXX 1 byte hole, try to pack */ 448 struct xfrm_sec_ctx *security; 449 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 450 }; 451 452 struct xfrm_migrate { 453 xfrm_address_t old_daddr; 454 xfrm_address_t old_saddr; 455 xfrm_address_t new_daddr; 456 xfrm_address_t new_saddr; 457 u8 proto; 458 u8 mode; 459 u16 reserved; 460 u32 reqid; 461 u16 old_family; 462 u16 new_family; 463 }; 464 465 #define XFRM_KM_TIMEOUT 30 466 /* which seqno */ 467 #define XFRM_REPLAY_SEQ 1 468 #define XFRM_REPLAY_OSEQ 2 469 #define XFRM_REPLAY_SEQ_MASK 3 470 /* what happened */ 471 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 472 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 473 474 /* default aevent timeout in units of 100ms */ 475 #define XFRM_AE_ETIME 10 476 /* Async Event timer multiplier */ 477 #define XFRM_AE_ETH_M 10 478 /* default seq threshold size */ 479 #define XFRM_AE_SEQT_SIZE 2 480 481 struct xfrm_mgr 482 { 483 struct list_head list; 484 char *id; 485 int (*notify)(struct xfrm_state *x, struct km_event *c); 486 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); 487 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 488 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 489 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c); 490 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 491 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles); 492 }; 493 494 extern int xfrm_register_km(struct xfrm_mgr *km); 495 extern int xfrm_unregister_km(struct xfrm_mgr *km); 496 497 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2]; 498 499 /* 500 * This structure is used for the duration where packets are being 501 * transformed by IPsec. As soon as the packet leaves IPsec the 502 * area beyond the generic IP part may be overwritten. 503 */ 504 struct xfrm_skb_cb { 505 union { 506 struct inet_skb_parm h4; 507 struct inet6_skb_parm h6; 508 } header; 509 510 /* Sequence number for replay protection. */ 511 u64 seq; 512 }; 513 514 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) 515 516 /* 517 * This structure is used by the afinfo prepare_input/prepare_output functions 518 * to transmit header information to the mode input/output functions. 519 */ 520 struct xfrm_mode_skb_cb { 521 union { 522 struct inet_skb_parm h4; 523 struct inet6_skb_parm h6; 524 } header; 525 526 /* Copied from header for IPv4, always set to zero and DF for IPv6. */ 527 __be16 id; 528 __be16 frag_off; 529 530 /* TOS for IPv4, class for IPv6. */ 531 u8 tos; 532 533 /* TTL for IPv4, hop limitfor IPv6. */ 534 u8 ttl; 535 536 /* Protocol for IPv4, NH for IPv6. */ 537 u8 protocol; 538 539 /* Used by IPv6 only, zero for IPv4. */ 540 u8 flow_lbl[3]; 541 }; 542 543 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0])) 544 545 /* 546 * This structure is used by the input processing to locate the SPI and 547 * related information. 548 */ 549 struct xfrm_spi_skb_cb { 550 union { 551 struct inet_skb_parm h4; 552 struct inet6_skb_parm h6; 553 } header; 554 555 unsigned int daddroff; 556 unsigned int family; 557 }; 558 559 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0])) 560 561 /* Audit Information */ 562 struct xfrm_audit 563 { 564 u32 loginuid; 565 u32 secid; 566 }; 567 568 #ifdef CONFIG_AUDITSYSCALL 569 static inline struct audit_buffer *xfrm_audit_start(const char *op) 570 { 571 struct audit_buffer *audit_buf = NULL; 572 573 if (audit_enabled == 0) 574 return NULL; 575 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, 576 AUDIT_MAC_IPSEC_EVENT); 577 if (audit_buf == NULL) 578 return NULL; 579 audit_log_format(audit_buf, "op=%s", op); 580 return audit_buf; 581 } 582 583 static inline void xfrm_audit_helper_usrinfo(u32 auid, u32 secid, 584 struct audit_buffer *audit_buf) 585 { 586 char *secctx; 587 u32 secctx_len; 588 589 audit_log_format(audit_buf, " auid=%u", auid); 590 if (secid != 0 && 591 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) { 592 audit_log_format(audit_buf, " subj=%s", secctx); 593 security_release_secctx(secctx, secctx_len); 594 } else 595 audit_log_task_context(audit_buf); 596 } 597 598 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 599 u32 auid, u32 secid); 600 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 601 u32 auid, u32 secid); 602 extern void xfrm_audit_state_add(struct xfrm_state *x, int result, 603 u32 auid, u32 secid); 604 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result, 605 u32 auid, u32 secid); 606 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 607 struct sk_buff *skb); 608 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family); 609 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 610 __be32 net_spi, __be32 net_seq); 611 extern void xfrm_audit_state_icvfail(struct xfrm_state *x, 612 struct sk_buff *skb, u8 proto); 613 #else 614 #define xfrm_audit_policy_add(x, r, a, s) do { ; } while (0) 615 #define xfrm_audit_policy_delete(x, r, a, s) do { ; } while (0) 616 #define xfrm_audit_state_add(x, r, a, s) do { ; } while (0) 617 #define xfrm_audit_state_delete(x, r, a, s) do { ; } while (0) 618 #define xfrm_audit_state_replay_overflow(x, s) do { ; } while (0) 619 #define xfrm_audit_state_notfound_simple(s, f) do { ; } while (0) 620 #define xfrm_audit_state_notfound(s, f, sp, sq) do { ; } while (0) 621 #define xfrm_audit_state_icvfail(x, s, p) do { ; } while (0) 622 #endif /* CONFIG_AUDITSYSCALL */ 623 624 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 625 { 626 if (likely(policy != NULL)) 627 atomic_inc(&policy->refcnt); 628 } 629 630 extern void xfrm_policy_destroy(struct xfrm_policy *policy); 631 632 static inline void xfrm_pol_put(struct xfrm_policy *policy) 633 { 634 if (atomic_dec_and_test(&policy->refcnt)) 635 xfrm_policy_destroy(policy); 636 } 637 638 #ifdef CONFIG_XFRM_SUB_POLICY 639 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 640 { 641 int i; 642 for (i = npols - 1; i >= 0; --i) 643 xfrm_pol_put(pols[i]); 644 } 645 #else 646 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 647 { 648 xfrm_pol_put(pols[0]); 649 } 650 #endif 651 652 extern void __xfrm_state_destroy(struct xfrm_state *); 653 654 static inline void __xfrm_state_put(struct xfrm_state *x) 655 { 656 atomic_dec(&x->refcnt); 657 } 658 659 static inline void xfrm_state_put(struct xfrm_state *x) 660 { 661 if (atomic_dec_and_test(&x->refcnt)) 662 __xfrm_state_destroy(x); 663 } 664 665 static inline void xfrm_state_hold(struct xfrm_state *x) 666 { 667 atomic_inc(&x->refcnt); 668 } 669 670 static __inline__ int addr_match(void *token1, void *token2, int prefixlen) 671 { 672 __be32 *a1 = token1; 673 __be32 *a2 = token2; 674 int pdw; 675 int pbi; 676 677 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */ 678 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 679 680 if (pdw) 681 if (memcmp(a1, a2, pdw << 2)) 682 return 0; 683 684 if (pbi) { 685 __be32 mask; 686 687 mask = htonl((0xffffffff) << (32 - pbi)); 688 689 if ((a1[pdw] ^ a2[pdw]) & mask) 690 return 0; 691 } 692 693 return 1; 694 } 695 696 static __inline__ 697 __be16 xfrm_flowi_sport(struct flowi *fl) 698 { 699 __be16 port; 700 switch(fl->proto) { 701 case IPPROTO_TCP: 702 case IPPROTO_UDP: 703 case IPPROTO_UDPLITE: 704 case IPPROTO_SCTP: 705 port = fl->fl_ip_sport; 706 break; 707 case IPPROTO_ICMP: 708 case IPPROTO_ICMPV6: 709 port = htons(fl->fl_icmp_type); 710 break; 711 case IPPROTO_MH: 712 port = htons(fl->fl_mh_type); 713 break; 714 default: 715 port = 0; /*XXX*/ 716 } 717 return port; 718 } 719 720 static __inline__ 721 __be16 xfrm_flowi_dport(struct flowi *fl) 722 { 723 __be16 port; 724 switch(fl->proto) { 725 case IPPROTO_TCP: 726 case IPPROTO_UDP: 727 case IPPROTO_UDPLITE: 728 case IPPROTO_SCTP: 729 port = fl->fl_ip_dport; 730 break; 731 case IPPROTO_ICMP: 732 case IPPROTO_ICMPV6: 733 port = htons(fl->fl_icmp_code); 734 break; 735 default: 736 port = 0; /*XXX*/ 737 } 738 return port; 739 } 740 741 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, 742 unsigned short family); 743 744 #ifdef CONFIG_SECURITY_NETWORK_XFRM 745 /* If neither has a context --> match 746 * Otherwise, both must have a context and the sids, doi, alg must match 747 */ 748 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 749 { 750 return ((!s1 && !s2) || 751 (s1 && s2 && 752 (s1->ctx_sid == s2->ctx_sid) && 753 (s1->ctx_doi == s2->ctx_doi) && 754 (s1->ctx_alg == s2->ctx_alg))); 755 } 756 #else 757 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 758 { 759 return 1; 760 } 761 #endif 762 763 /* A struct encoding bundle of transformations to apply to some set of flow. 764 * 765 * dst->child points to the next element of bundle. 766 * dst->xfrm points to an instanse of transformer. 767 * 768 * Due to unfortunate limitations of current routing cache, which we 769 * have no time to fix, it mirrors struct rtable and bound to the same 770 * routing key, including saddr,daddr. However, we can have many of 771 * bundles differing by session id. All the bundles grow from a parent 772 * policy rule. 773 */ 774 struct xfrm_dst 775 { 776 union { 777 struct dst_entry dst; 778 struct rtable rt; 779 struct rt6_info rt6; 780 } u; 781 struct dst_entry *route; 782 #ifdef CONFIG_XFRM_SUB_POLICY 783 struct flowi *origin; 784 struct xfrm_selector *partner; 785 #endif 786 u32 genid; 787 u32 route_mtu_cached; 788 u32 child_mtu_cached; 789 u32 route_cookie; 790 u32 path_cookie; 791 }; 792 793 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 794 { 795 dst_release(xdst->route); 796 if (likely(xdst->u.dst.xfrm)) 797 xfrm_state_put(xdst->u.dst.xfrm); 798 #ifdef CONFIG_XFRM_SUB_POLICY 799 kfree(xdst->origin); 800 xdst->origin = NULL; 801 kfree(xdst->partner); 802 xdst->partner = NULL; 803 #endif 804 } 805 806 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 807 808 struct sec_path 809 { 810 atomic_t refcnt; 811 int len; 812 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 813 }; 814 815 static inline struct sec_path * 816 secpath_get(struct sec_path *sp) 817 { 818 if (sp) 819 atomic_inc(&sp->refcnt); 820 return sp; 821 } 822 823 extern void __secpath_destroy(struct sec_path *sp); 824 825 static inline void 826 secpath_put(struct sec_path *sp) 827 { 828 if (sp && atomic_dec_and_test(&sp->refcnt)) 829 __secpath_destroy(sp); 830 } 831 832 extern struct sec_path *secpath_dup(struct sec_path *src); 833 834 static inline void 835 secpath_reset(struct sk_buff *skb) 836 { 837 #ifdef CONFIG_XFRM 838 secpath_put(skb->sp); 839 skb->sp = NULL; 840 #endif 841 } 842 843 static inline int 844 xfrm_addr_any(xfrm_address_t *addr, unsigned short family) 845 { 846 switch (family) { 847 case AF_INET: 848 return addr->a4 == 0; 849 case AF_INET6: 850 return ipv6_addr_any((struct in6_addr *)&addr->a6); 851 } 852 return 0; 853 } 854 855 static inline int 856 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 857 { 858 return (tmpl->saddr.a4 && 859 tmpl->saddr.a4 != x->props.saddr.a4); 860 } 861 862 static inline int 863 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 864 { 865 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 866 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 867 } 868 869 static inline int 870 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family) 871 { 872 switch (family) { 873 case AF_INET: 874 return __xfrm4_state_addr_cmp(tmpl, x); 875 case AF_INET6: 876 return __xfrm6_state_addr_cmp(tmpl, x); 877 } 878 return !0; 879 } 880 881 #ifdef CONFIG_XFRM 882 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); 883 884 static inline int __xfrm_policy_check2(struct sock *sk, int dir, 885 struct sk_buff *skb, 886 unsigned int family, int reverse) 887 { 888 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); 889 890 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 891 return __xfrm_policy_check(sk, ndir, skb, family); 892 893 return (!xfrm_policy_count[dir] && !skb->sp) || 894 (skb->dst->flags & DST_NOPOLICY) || 895 __xfrm_policy_check(sk, ndir, skb, family); 896 } 897 898 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 899 { 900 return __xfrm_policy_check2(sk, dir, skb, family, 0); 901 } 902 903 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 904 { 905 return xfrm_policy_check(sk, dir, skb, AF_INET); 906 } 907 908 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 909 { 910 return xfrm_policy_check(sk, dir, skb, AF_INET6); 911 } 912 913 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 914 struct sk_buff *skb) 915 { 916 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); 917 } 918 919 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 920 struct sk_buff *skb) 921 { 922 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); 923 } 924 925 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 926 unsigned int family, int reverse); 927 928 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 929 unsigned int family) 930 { 931 return __xfrm_decode_session(skb, fl, family, 0); 932 } 933 934 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 935 struct flowi *fl, 936 unsigned int family) 937 { 938 return __xfrm_decode_session(skb, fl, family, 1); 939 } 940 941 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 942 943 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 944 { 945 return !xfrm_policy_count[XFRM_POLICY_OUT] || 946 (skb->dst->flags & DST_NOXFRM) || 947 __xfrm_route_forward(skb, family); 948 } 949 950 static inline int xfrm4_route_forward(struct sk_buff *skb) 951 { 952 return xfrm_route_forward(skb, AF_INET); 953 } 954 955 static inline int xfrm6_route_forward(struct sk_buff *skb) 956 { 957 return xfrm_route_forward(skb, AF_INET6); 958 } 959 960 extern int __xfrm_sk_clone_policy(struct sock *sk); 961 962 static inline int xfrm_sk_clone_policy(struct sock *sk) 963 { 964 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) 965 return __xfrm_sk_clone_policy(sk); 966 return 0; 967 } 968 969 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 970 971 static inline void xfrm_sk_free_policy(struct sock *sk) 972 { 973 if (unlikely(sk->sk_policy[0] != NULL)) { 974 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); 975 sk->sk_policy[0] = NULL; 976 } 977 if (unlikely(sk->sk_policy[1] != NULL)) { 978 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); 979 sk->sk_policy[1] = NULL; 980 } 981 } 982 983 #else 984 985 static inline void xfrm_sk_free_policy(struct sock *sk) {} 986 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } 987 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 988 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 989 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 990 { 991 return 1; 992 } 993 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 994 { 995 return 1; 996 } 997 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 998 { 999 return 1; 1000 } 1001 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1002 struct flowi *fl, 1003 unsigned int family) 1004 { 1005 return -ENOSYS; 1006 } 1007 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1008 struct sk_buff *skb) 1009 { 1010 return 1; 1011 } 1012 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1013 struct sk_buff *skb) 1014 { 1015 return 1; 1016 } 1017 #endif 1018 1019 static __inline__ 1020 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family) 1021 { 1022 switch (family){ 1023 case AF_INET: 1024 return (xfrm_address_t *)&fl->fl4_dst; 1025 case AF_INET6: 1026 return (xfrm_address_t *)&fl->fl6_dst; 1027 } 1028 return NULL; 1029 } 1030 1031 static __inline__ 1032 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family) 1033 { 1034 switch (family){ 1035 case AF_INET: 1036 return (xfrm_address_t *)&fl->fl4_src; 1037 case AF_INET6: 1038 return (xfrm_address_t *)&fl->fl6_src; 1039 } 1040 return NULL; 1041 } 1042 1043 static __inline__ int 1044 __xfrm4_state_addr_check(struct xfrm_state *x, 1045 xfrm_address_t *daddr, xfrm_address_t *saddr) 1046 { 1047 if (daddr->a4 == x->id.daddr.a4 && 1048 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 1049 return 1; 1050 return 0; 1051 } 1052 1053 static __inline__ int 1054 __xfrm6_state_addr_check(struct xfrm_state *x, 1055 xfrm_address_t *daddr, xfrm_address_t *saddr) 1056 { 1057 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 1058 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| 1059 ipv6_addr_any((struct in6_addr *)saddr) || 1060 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 1061 return 1; 1062 return 0; 1063 } 1064 1065 static __inline__ int 1066 xfrm_state_addr_check(struct xfrm_state *x, 1067 xfrm_address_t *daddr, xfrm_address_t *saddr, 1068 unsigned short family) 1069 { 1070 switch (family) { 1071 case AF_INET: 1072 return __xfrm4_state_addr_check(x, daddr, saddr); 1073 case AF_INET6: 1074 return __xfrm6_state_addr_check(x, daddr, saddr); 1075 } 1076 return 0; 1077 } 1078 1079 static __inline__ int 1080 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl, 1081 unsigned short family) 1082 { 1083 switch (family) { 1084 case AF_INET: 1085 return __xfrm4_state_addr_check(x, 1086 (xfrm_address_t *)&fl->fl4_dst, 1087 (xfrm_address_t *)&fl->fl4_src); 1088 case AF_INET6: 1089 return __xfrm6_state_addr_check(x, 1090 (xfrm_address_t *)&fl->fl6_dst, 1091 (xfrm_address_t *)&fl->fl6_src); 1092 } 1093 return 0; 1094 } 1095 1096 static inline int xfrm_state_kern(struct xfrm_state *x) 1097 { 1098 return atomic_read(&x->tunnel_users); 1099 } 1100 1101 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 1102 { 1103 return (!userproto || proto == userproto || 1104 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 1105 proto == IPPROTO_ESP || 1106 proto == IPPROTO_COMP))); 1107 } 1108 1109 /* 1110 * xfrm algorithm information 1111 */ 1112 struct xfrm_algo_aead_info { 1113 u16 icv_truncbits; 1114 }; 1115 1116 struct xfrm_algo_auth_info { 1117 u16 icv_truncbits; 1118 u16 icv_fullbits; 1119 }; 1120 1121 struct xfrm_algo_encr_info { 1122 u16 blockbits; 1123 u16 defkeybits; 1124 }; 1125 1126 struct xfrm_algo_comp_info { 1127 u16 threshold; 1128 }; 1129 1130 struct xfrm_algo_desc { 1131 char *name; 1132 char *compat; 1133 u8 available:1; 1134 union { 1135 struct xfrm_algo_aead_info aead; 1136 struct xfrm_algo_auth_info auth; 1137 struct xfrm_algo_encr_info encr; 1138 struct xfrm_algo_comp_info comp; 1139 } uinfo; 1140 struct sadb_alg desc; 1141 }; 1142 1143 /* XFRM tunnel handlers. */ 1144 struct xfrm_tunnel { 1145 int (*handler)(struct sk_buff *skb); 1146 int (*err_handler)(struct sk_buff *skb, __u32 info); 1147 1148 struct xfrm_tunnel *next; 1149 int priority; 1150 }; 1151 1152 struct xfrm6_tunnel { 1153 int (*handler)(struct sk_buff *skb); 1154 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1155 int type, int code, int offset, __be32 info); 1156 struct xfrm6_tunnel *next; 1157 int priority; 1158 }; 1159 1160 extern void xfrm_init(void); 1161 extern void xfrm4_init(void); 1162 extern void xfrm_state_init(void); 1163 extern void xfrm4_state_init(void); 1164 #ifdef CONFIG_XFRM 1165 extern int xfrm6_init(void); 1166 extern void xfrm6_fini(void); 1167 extern int xfrm6_state_init(void); 1168 extern void xfrm6_state_fini(void); 1169 #else 1170 static inline int xfrm6_init(void) 1171 { 1172 return 0; 1173 } 1174 static inline void xfrm6_fini(void) 1175 { 1176 ; 1177 } 1178 #endif 1179 1180 #ifdef CONFIG_XFRM_STATISTICS 1181 extern int xfrm_proc_init(void); 1182 #endif 1183 1184 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *); 1185 extern struct xfrm_state *xfrm_state_alloc(void); 1186 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, 1187 struct flowi *fl, struct xfrm_tmpl *tmpl, 1188 struct xfrm_policy *pol, int *err, 1189 unsigned short family); 1190 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr, 1191 xfrm_address_t *saddr, 1192 unsigned short family, 1193 u8 mode, u8 proto, u32 reqid); 1194 extern int xfrm_state_check_expire(struct xfrm_state *x); 1195 extern void xfrm_state_insert(struct xfrm_state *x); 1196 extern int xfrm_state_add(struct xfrm_state *x); 1197 extern int xfrm_state_update(struct xfrm_state *x); 1198 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family); 1199 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family); 1200 #ifdef CONFIG_XFRM_SUB_POLICY 1201 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 1202 int n, unsigned short family); 1203 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 1204 int n, unsigned short family); 1205 #else 1206 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 1207 int n, unsigned short family) 1208 { 1209 return -ENOSYS; 1210 } 1211 1212 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 1213 int n, unsigned short family) 1214 { 1215 return -ENOSYS; 1216 } 1217 #endif 1218 1219 struct xfrmk_sadinfo { 1220 u32 sadhcnt; /* current hash bkts */ 1221 u32 sadhmcnt; /* max allowed hash bkts */ 1222 u32 sadcnt; /* current running count */ 1223 }; 1224 1225 struct xfrmk_spdinfo { 1226 u32 incnt; 1227 u32 outcnt; 1228 u32 fwdcnt; 1229 u32 inscnt; 1230 u32 outscnt; 1231 u32 fwdscnt; 1232 u32 spdhcnt; 1233 u32 spdhmcnt; 1234 }; 1235 1236 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq); 1237 extern int xfrm_state_delete(struct xfrm_state *x); 1238 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info); 1239 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si); 1240 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si); 1241 extern int xfrm_replay_check(struct xfrm_state *x, 1242 struct sk_buff *skb, __be32 seq); 1243 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq); 1244 extern void xfrm_replay_notify(struct xfrm_state *x, int event); 1245 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); 1246 extern int xfrm_init_state(struct xfrm_state *x); 1247 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb); 1248 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, 1249 int encap_type); 1250 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr); 1251 extern int xfrm_output_resume(struct sk_buff *skb, int err); 1252 extern int xfrm_output(struct sk_buff *skb); 1253 extern int xfrm4_extract_header(struct sk_buff *skb); 1254 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1255 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1256 int encap_type); 1257 extern int xfrm4_transport_finish(struct sk_buff *skb, int async); 1258 extern int xfrm4_rcv(struct sk_buff *skb); 1259 1260 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1261 { 1262 return xfrm4_rcv_encap(skb, nexthdr, spi, 0); 1263 } 1264 1265 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1266 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb); 1267 extern int xfrm4_output(struct sk_buff *skb); 1268 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1269 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1270 extern int xfrm6_extract_header(struct sk_buff *skb); 1271 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1272 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi); 1273 extern int xfrm6_transport_finish(struct sk_buff *skb, int async); 1274 extern int xfrm6_rcv(struct sk_buff *skb); 1275 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1276 xfrm_address_t *saddr, u8 proto); 1277 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1278 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1279 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr); 1280 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr); 1281 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr); 1282 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1283 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb); 1284 extern int xfrm6_output(struct sk_buff *skb); 1285 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, 1286 u8 **prevhdr); 1287 1288 #ifdef CONFIG_XFRM 1289 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1290 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); 1291 #else 1292 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 1293 { 1294 return -ENOPROTOOPT; 1295 } 1296 1297 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb) 1298 { 1299 /* should not happen */ 1300 kfree_skb(skb); 1301 return 0; 1302 } 1303 #endif 1304 1305 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp); 1306 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *); 1307 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1308 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, 1309 struct xfrm_selector *sel, 1310 struct xfrm_sec_ctx *ctx, int delete, 1311 int *err); 1312 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err); 1313 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info); 1314 u32 xfrm_get_acqseq(void); 1315 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 1316 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto, 1317 xfrm_address_t *daddr, xfrm_address_t *saddr, 1318 int create, unsigned short family); 1319 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1320 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst, 1321 struct flowi *fl, int family, int strict); 1322 1323 #ifdef CONFIG_XFRM_MIGRATE 1324 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 1325 struct xfrm_migrate *m, int num_bundles); 1326 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m); 1327 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, 1328 struct xfrm_migrate *m); 1329 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 1330 struct xfrm_migrate *m, int num_bundles); 1331 #endif 1332 1333 extern wait_queue_head_t km_waitq; 1334 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1335 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid); 1336 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 1337 1338 extern void xfrm_input_init(void); 1339 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1340 1341 extern void xfrm_probe_algs(void); 1342 extern int xfrm_count_auth_supported(void); 1343 extern int xfrm_count_enc_supported(void); 1344 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1345 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1346 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1347 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1348 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1349 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe); 1350 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe); 1351 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe); 1352 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len, 1353 int probe); 1354 1355 struct hash_desc; 1356 struct scatterlist; 1357 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *, 1358 unsigned int); 1359 1360 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm, 1361 int offset, int len, icv_update_fn_t icv_update); 1362 1363 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b, 1364 int family) 1365 { 1366 switch (family) { 1367 default: 1368 case AF_INET: 1369 return (__force __u32)a->a4 - (__force __u32)b->a4; 1370 case AF_INET6: 1371 return ipv6_addr_cmp((struct in6_addr *)a, 1372 (struct in6_addr *)b); 1373 } 1374 } 1375 1376 static inline int xfrm_policy_id2dir(u32 index) 1377 { 1378 return index & 7; 1379 } 1380 1381 static inline int xfrm_aevent_is_on(void) 1382 { 1383 struct sock *nlsk; 1384 int ret = 0; 1385 1386 rcu_read_lock(); 1387 nlsk = rcu_dereference(xfrm_nl); 1388 if (nlsk) 1389 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1390 rcu_read_unlock(); 1391 return ret; 1392 } 1393 1394 static inline int xfrm_alg_len(struct xfrm_algo *alg) 1395 { 1396 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1397 } 1398 1399 #ifdef CONFIG_XFRM_MIGRATE 1400 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1401 { 1402 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); 1403 } 1404 1405 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1406 { 1407 int i; 1408 for (i = 0; i < n; i++) 1409 xfrm_state_put(*(states + i)); 1410 } 1411 1412 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1413 { 1414 int i; 1415 for (i = 0; i < n; i++) 1416 xfrm_state_delete(*(states + i)); 1417 } 1418 #endif 1419 1420 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) 1421 { 1422 return skb->sp->xvec[skb->sp->len - 1]; 1423 } 1424 1425 #endif /* _NET_XFRM_H */ 1426