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 list_head all; 125 struct hlist_node bydst; 126 struct hlist_node bysrc; 127 struct hlist_node byspi; 128 129 atomic_t refcnt; 130 spinlock_t lock; 131 132 struct xfrm_id id; 133 struct xfrm_selector sel; 134 135 u32 genid; 136 137 /* Key manger bits */ 138 struct { 139 u8 state; 140 u8 dying; 141 u32 seq; 142 } km; 143 144 /* Parameters of this state. */ 145 struct { 146 u32 reqid; 147 u8 mode; 148 u8 replay_window; 149 u8 aalgo, ealgo, calgo; 150 u8 flags; 151 u16 family; 152 xfrm_address_t saddr; 153 int header_len; 154 int trailer_len; 155 } props; 156 157 struct xfrm_lifetime_cfg lft; 158 159 /* Data for transformer */ 160 struct xfrm_algo *aalg; 161 struct xfrm_algo *ealg; 162 struct xfrm_algo *calg; 163 struct xfrm_algo_aead *aead; 164 165 /* Data for encapsulator */ 166 struct xfrm_encap_tmpl *encap; 167 168 /* Data for care-of address */ 169 xfrm_address_t *coaddr; 170 171 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 172 struct xfrm_state *tunnel; 173 174 /* If a tunnel, number of users + 1 */ 175 atomic_t tunnel_users; 176 177 /* State for replay detection */ 178 struct xfrm_replay_state replay; 179 180 /* Replay detection state at the time we sent the last notification */ 181 struct xfrm_replay_state preplay; 182 183 /* internal flag that only holds state for delayed aevent at the 184 * moment 185 */ 186 u32 xflags; 187 188 /* Replay detection notification settings */ 189 u32 replay_maxage; 190 u32 replay_maxdiff; 191 192 /* Replay detection notification timer */ 193 struct timer_list rtimer; 194 195 /* Statistics */ 196 struct xfrm_stats stats; 197 198 struct xfrm_lifetime_cur curlft; 199 struct timer_list timer; 200 201 /* Last used time */ 202 unsigned long lastused; 203 204 /* Reference to data common to all the instances of this 205 * transformer. */ 206 const struct xfrm_type *type; 207 struct xfrm_mode *inner_mode; 208 struct xfrm_mode *inner_mode_iaf; 209 struct xfrm_mode *outer_mode; 210 211 /* Security context */ 212 struct xfrm_sec_ctx *security; 213 214 /* Private data of this transformer, format is opaque, 215 * interpreted by xfrm_type methods. */ 216 void *data; 217 }; 218 219 /* xflags - make enum if more show up */ 220 #define XFRM_TIME_DEFER 1 221 222 enum { 223 XFRM_STATE_VOID, 224 XFRM_STATE_ACQ, 225 XFRM_STATE_VALID, 226 XFRM_STATE_ERROR, 227 XFRM_STATE_EXPIRED, 228 XFRM_STATE_DEAD 229 }; 230 231 /* callback structure passed from either netlink or pfkey */ 232 struct km_event 233 { 234 union { 235 u32 hard; 236 u32 proto; 237 u32 byid; 238 u32 aevent; 239 u32 type; 240 } data; 241 242 u32 seq; 243 u32 pid; 244 u32 event; 245 }; 246 247 struct net_device; 248 struct xfrm_type; 249 struct xfrm_dst; 250 struct xfrm_policy_afinfo { 251 unsigned short family; 252 struct dst_ops *dst_ops; 253 void (*garbage_collect)(void); 254 struct dst_entry *(*dst_lookup)(int tos, xfrm_address_t *saddr, 255 xfrm_address_t *daddr); 256 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr); 257 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy); 258 void (*decode_session)(struct sk_buff *skb, 259 struct flowi *fl, 260 int reverse); 261 int (*get_tos)(struct flowi *fl); 262 int (*init_path)(struct xfrm_dst *path, 263 struct dst_entry *dst, 264 int nfheader_len); 265 int (*fill_dst)(struct xfrm_dst *xdst, 266 struct net_device *dev); 267 }; 268 269 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); 270 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); 271 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c); 272 extern void km_state_notify(struct xfrm_state *x, struct km_event *c); 273 274 struct xfrm_tmpl; 275 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); 276 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid); 277 extern int __xfrm_state_delete(struct xfrm_state *x); 278 279 struct xfrm_state_afinfo { 280 unsigned int family; 281 unsigned int proto; 282 __be16 eth_proto; 283 struct module *owner; 284 const struct xfrm_type *type_map[IPPROTO_MAX]; 285 struct xfrm_mode *mode_map[XFRM_MODE_MAX]; 286 int (*init_flags)(struct xfrm_state *x); 287 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl, 288 struct xfrm_tmpl *tmpl, 289 xfrm_address_t *daddr, xfrm_address_t *saddr); 290 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n); 291 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n); 292 int (*output)(struct sk_buff *skb); 293 int (*extract_input)(struct xfrm_state *x, 294 struct sk_buff *skb); 295 int (*extract_output)(struct xfrm_state *x, 296 struct sk_buff *skb); 297 int (*transport_finish)(struct sk_buff *skb, 298 int async); 299 }; 300 301 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 302 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 303 304 extern void xfrm_state_delete_tunnel(struct xfrm_state *x); 305 306 struct xfrm_type 307 { 308 char *description; 309 struct module *owner; 310 __u8 proto; 311 __u8 flags; 312 #define XFRM_TYPE_NON_FRAGMENT 1 313 #define XFRM_TYPE_REPLAY_PROT 2 314 #define XFRM_TYPE_LOCAL_COADDR 4 315 #define XFRM_TYPE_REMOTE_COADDR 8 316 317 int (*init_state)(struct xfrm_state *x); 318 void (*destructor)(struct xfrm_state *); 319 int (*input)(struct xfrm_state *, struct sk_buff *skb); 320 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 321 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *); 322 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **); 323 /* Estimate maximal size of result of transformation of a dgram */ 324 u32 (*get_mtu)(struct xfrm_state *, int size); 325 }; 326 327 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family); 328 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); 329 330 struct xfrm_mode { 331 /* 332 * Remove encapsulation header. 333 * 334 * The IP header will be moved over the top of the encapsulation 335 * header. 336 * 337 * On entry, the transport header shall point to where the IP header 338 * should be and the network header shall be set to where the IP 339 * header currently is. skb->data shall point to the start of the 340 * payload. 341 */ 342 int (*input2)(struct xfrm_state *x, struct sk_buff *skb); 343 344 /* 345 * This is the actual input entry point. 346 * 347 * For transport mode and equivalent this would be identical to 348 * input2 (which does not need to be set). While tunnel mode 349 * and equivalent would set this to the tunnel encapsulation function 350 * xfrm4_prepare_input that would in turn call input2. 351 */ 352 int (*input)(struct xfrm_state *x, struct sk_buff *skb); 353 354 /* 355 * Add encapsulation header. 356 * 357 * On exit, the transport header will be set to the start of the 358 * encapsulation header to be filled in by x->type->output and 359 * the mac header will be set to the nextheader (protocol for 360 * IPv4) field of the extension header directly preceding the 361 * encapsulation header, or in its absence, that of the top IP 362 * header. The value of the network header will always point 363 * to the top IP header while skb->data will point to the payload. 364 */ 365 int (*output2)(struct xfrm_state *x,struct sk_buff *skb); 366 367 /* 368 * This is the actual output entry point. 369 * 370 * For transport mode and equivalent this would be identical to 371 * output2 (which does not need to be set). While tunnel mode 372 * and equivalent would set this to a tunnel encapsulation function 373 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn 374 * call output2. 375 */ 376 int (*output)(struct xfrm_state *x, struct sk_buff *skb); 377 378 struct xfrm_state_afinfo *afinfo; 379 struct module *owner; 380 unsigned int encap; 381 int flags; 382 }; 383 384 /* Flags for xfrm_mode. */ 385 enum { 386 XFRM_MODE_FLAG_TUNNEL = 1, 387 }; 388 389 extern int xfrm_register_mode(struct xfrm_mode *mode, int family); 390 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family); 391 392 static inline int xfrm_af2proto(unsigned int family) 393 { 394 switch(family) { 395 case AF_INET: 396 return IPPROTO_IPIP; 397 case AF_INET6: 398 return IPPROTO_IPV6; 399 default: 400 return 0; 401 } 402 } 403 404 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto) 405 { 406 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) || 407 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6)) 408 return x->inner_mode; 409 else 410 return x->inner_mode_iaf; 411 } 412 413 struct xfrm_tmpl 414 { 415 /* id in template is interpreted as: 416 * daddr - destination of tunnel, may be zero for transport mode. 417 * spi - zero to acquire spi. Not zero if spi is static, then 418 * daddr must be fixed too. 419 * proto - AH/ESP/IPCOMP 420 */ 421 struct xfrm_id id; 422 423 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 424 xfrm_address_t saddr; 425 426 unsigned short encap_family; 427 428 __u32 reqid; 429 430 /* Mode: transport, tunnel etc. */ 431 __u8 mode; 432 433 /* Sharing mode: unique, this session only, this user only etc. */ 434 __u8 share; 435 436 /* May skip this transfomration if no SA is found */ 437 __u8 optional; 438 439 /* Skip aalgos/ealgos/calgos checks. */ 440 __u8 allalgs; 441 442 /* Bit mask of algos allowed for acquisition */ 443 __u32 aalgos; 444 __u32 ealgos; 445 __u32 calgos; 446 }; 447 448 #define XFRM_MAX_DEPTH 6 449 450 struct xfrm_policy 451 { 452 struct xfrm_policy *next; 453 struct list_head bytype; 454 struct hlist_node bydst; 455 struct hlist_node byidx; 456 457 /* This lock only affects elements except for entry. */ 458 rwlock_t lock; 459 atomic_t refcnt; 460 struct timer_list timer; 461 462 u32 priority; 463 u32 index; 464 struct xfrm_selector selector; 465 struct xfrm_lifetime_cfg lft; 466 struct xfrm_lifetime_cur curlft; 467 struct dst_entry *bundles; 468 u16 family; 469 u8 type; 470 u8 action; 471 u8 flags; 472 u8 dead; 473 u8 xfrm_nr; 474 /* XXX 1 byte hole, try to pack */ 475 struct xfrm_sec_ctx *security; 476 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 477 }; 478 479 struct xfrm_migrate { 480 xfrm_address_t old_daddr; 481 xfrm_address_t old_saddr; 482 xfrm_address_t new_daddr; 483 xfrm_address_t new_saddr; 484 u8 proto; 485 u8 mode; 486 u16 reserved; 487 u32 reqid; 488 u16 old_family; 489 u16 new_family; 490 }; 491 492 #define XFRM_KM_TIMEOUT 30 493 /* which seqno */ 494 #define XFRM_REPLAY_SEQ 1 495 #define XFRM_REPLAY_OSEQ 2 496 #define XFRM_REPLAY_SEQ_MASK 3 497 /* what happened */ 498 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 499 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 500 501 /* default aevent timeout in units of 100ms */ 502 #define XFRM_AE_ETIME 10 503 /* Async Event timer multiplier */ 504 #define XFRM_AE_ETH_M 10 505 /* default seq threshold size */ 506 #define XFRM_AE_SEQT_SIZE 2 507 508 struct xfrm_mgr 509 { 510 struct list_head list; 511 char *id; 512 int (*notify)(struct xfrm_state *x, struct km_event *c); 513 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); 514 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 515 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 516 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c); 517 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 518 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles); 519 }; 520 521 extern int xfrm_register_km(struct xfrm_mgr *km); 522 extern int xfrm_unregister_km(struct xfrm_mgr *km); 523 524 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2]; 525 526 /* 527 * This structure is used for the duration where packets are being 528 * transformed by IPsec. As soon as the packet leaves IPsec the 529 * area beyond the generic IP part may be overwritten. 530 */ 531 struct xfrm_skb_cb { 532 union { 533 struct inet_skb_parm h4; 534 struct inet6_skb_parm h6; 535 } header; 536 537 /* Sequence number for replay protection. */ 538 union { 539 u64 output; 540 __be32 input; 541 } seq; 542 }; 543 544 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) 545 546 /* 547 * This structure is used by the afinfo prepare_input/prepare_output functions 548 * to transmit header information to the mode input/output functions. 549 */ 550 struct xfrm_mode_skb_cb { 551 union { 552 struct inet_skb_parm h4; 553 struct inet6_skb_parm h6; 554 } header; 555 556 /* Copied from header for IPv4, always set to zero and DF for IPv6. */ 557 __be16 id; 558 __be16 frag_off; 559 560 /* IP header length (excluding options or extension headers). */ 561 u8 ihl; 562 563 /* TOS for IPv4, class for IPv6. */ 564 u8 tos; 565 566 /* TTL for IPv4, hop limitfor IPv6. */ 567 u8 ttl; 568 569 /* Protocol for IPv4, NH for IPv6. */ 570 u8 protocol; 571 572 /* Option length for IPv4, zero for IPv6. */ 573 u8 optlen; 574 575 /* Used by IPv6 only, zero for IPv4. */ 576 u8 flow_lbl[3]; 577 }; 578 579 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0])) 580 581 /* 582 * This structure is used by the input processing to locate the SPI and 583 * related information. 584 */ 585 struct xfrm_spi_skb_cb { 586 union { 587 struct inet_skb_parm h4; 588 struct inet6_skb_parm h6; 589 } header; 590 591 unsigned int daddroff; 592 unsigned int family; 593 }; 594 595 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0])) 596 597 /* Audit Information */ 598 struct xfrm_audit 599 { 600 u32 secid; 601 uid_t loginuid; 602 u32 sessionid; 603 }; 604 605 #ifdef CONFIG_AUDITSYSCALL 606 static inline struct audit_buffer *xfrm_audit_start(const char *op) 607 { 608 struct audit_buffer *audit_buf = NULL; 609 610 if (audit_enabled == 0) 611 return NULL; 612 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, 613 AUDIT_MAC_IPSEC_EVENT); 614 if (audit_buf == NULL) 615 return NULL; 616 audit_log_format(audit_buf, "op=%s", op); 617 return audit_buf; 618 } 619 620 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid, 621 struct audit_buffer *audit_buf) 622 { 623 char *secctx; 624 u32 secctx_len; 625 626 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses); 627 if (secid != 0 && 628 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) { 629 audit_log_format(audit_buf, " subj=%s", secctx); 630 security_release_secctx(secctx, secctx_len); 631 } else 632 audit_log_task_context(audit_buf); 633 } 634 635 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 636 u32 auid, u32 ses, u32 secid); 637 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 638 u32 auid, u32 ses, u32 secid); 639 extern void xfrm_audit_state_add(struct xfrm_state *x, int result, 640 u32 auid, u32 ses, u32 secid); 641 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result, 642 u32 auid, u32 ses, u32 secid); 643 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 644 struct sk_buff *skb); 645 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family); 646 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 647 __be32 net_spi, __be32 net_seq); 648 extern void xfrm_audit_state_icvfail(struct xfrm_state *x, 649 struct sk_buff *skb, u8 proto); 650 #else 651 652 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 653 u32 auid, u32 ses, u32 secid) 654 { 655 } 656 657 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 658 u32 auid, u32 ses, u32 secid) 659 { 660 } 661 662 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result, 663 u32 auid, u32 ses, u32 secid) 664 { 665 } 666 667 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result, 668 u32 auid, u32 ses, u32 secid) 669 { 670 } 671 672 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 673 struct sk_buff *skb) 674 { 675 } 676 677 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb, 678 u16 family) 679 { 680 } 681 682 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 683 __be32 net_spi, __be32 net_seq) 684 { 685 } 686 687 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x, 688 struct sk_buff *skb, u8 proto) 689 { 690 } 691 #endif /* CONFIG_AUDITSYSCALL */ 692 693 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 694 { 695 if (likely(policy != NULL)) 696 atomic_inc(&policy->refcnt); 697 } 698 699 extern void xfrm_policy_destroy(struct xfrm_policy *policy); 700 701 static inline void xfrm_pol_put(struct xfrm_policy *policy) 702 { 703 if (atomic_dec_and_test(&policy->refcnt)) 704 xfrm_policy_destroy(policy); 705 } 706 707 #ifdef CONFIG_XFRM_SUB_POLICY 708 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 709 { 710 int i; 711 for (i = npols - 1; i >= 0; --i) 712 xfrm_pol_put(pols[i]); 713 } 714 #else 715 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 716 { 717 xfrm_pol_put(pols[0]); 718 } 719 #endif 720 721 extern void __xfrm_state_destroy(struct xfrm_state *); 722 723 static inline void __xfrm_state_put(struct xfrm_state *x) 724 { 725 atomic_dec(&x->refcnt); 726 } 727 728 static inline void xfrm_state_put(struct xfrm_state *x) 729 { 730 if (atomic_dec_and_test(&x->refcnt)) 731 __xfrm_state_destroy(x); 732 } 733 734 static inline void xfrm_state_hold(struct xfrm_state *x) 735 { 736 atomic_inc(&x->refcnt); 737 } 738 739 static __inline__ int addr_match(void *token1, void *token2, int prefixlen) 740 { 741 __be32 *a1 = token1; 742 __be32 *a2 = token2; 743 int pdw; 744 int pbi; 745 746 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */ 747 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 748 749 if (pdw) 750 if (memcmp(a1, a2, pdw << 2)) 751 return 0; 752 753 if (pbi) { 754 __be32 mask; 755 756 mask = htonl((0xffffffff) << (32 - pbi)); 757 758 if ((a1[pdw] ^ a2[pdw]) & mask) 759 return 0; 760 } 761 762 return 1; 763 } 764 765 static __inline__ 766 __be16 xfrm_flowi_sport(struct flowi *fl) 767 { 768 __be16 port; 769 switch(fl->proto) { 770 case IPPROTO_TCP: 771 case IPPROTO_UDP: 772 case IPPROTO_UDPLITE: 773 case IPPROTO_SCTP: 774 port = fl->fl_ip_sport; 775 break; 776 case IPPROTO_ICMP: 777 case IPPROTO_ICMPV6: 778 port = htons(fl->fl_icmp_type); 779 break; 780 case IPPROTO_MH: 781 port = htons(fl->fl_mh_type); 782 break; 783 default: 784 port = 0; /*XXX*/ 785 } 786 return port; 787 } 788 789 static __inline__ 790 __be16 xfrm_flowi_dport(struct flowi *fl) 791 { 792 __be16 port; 793 switch(fl->proto) { 794 case IPPROTO_TCP: 795 case IPPROTO_UDP: 796 case IPPROTO_UDPLITE: 797 case IPPROTO_SCTP: 798 port = fl->fl_ip_dport; 799 break; 800 case IPPROTO_ICMP: 801 case IPPROTO_ICMPV6: 802 port = htons(fl->fl_icmp_code); 803 break; 804 default: 805 port = 0; /*XXX*/ 806 } 807 return port; 808 } 809 810 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, 811 unsigned short family); 812 813 #ifdef CONFIG_SECURITY_NETWORK_XFRM 814 /* If neither has a context --> match 815 * Otherwise, both must have a context and the sids, doi, alg must match 816 */ 817 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 818 { 819 return ((!s1 && !s2) || 820 (s1 && s2 && 821 (s1->ctx_sid == s2->ctx_sid) && 822 (s1->ctx_doi == s2->ctx_doi) && 823 (s1->ctx_alg == s2->ctx_alg))); 824 } 825 #else 826 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 827 { 828 return 1; 829 } 830 #endif 831 832 /* A struct encoding bundle of transformations to apply to some set of flow. 833 * 834 * dst->child points to the next element of bundle. 835 * dst->xfrm points to an instanse of transformer. 836 * 837 * Due to unfortunate limitations of current routing cache, which we 838 * have no time to fix, it mirrors struct rtable and bound to the same 839 * routing key, including saddr,daddr. However, we can have many of 840 * bundles differing by session id. All the bundles grow from a parent 841 * policy rule. 842 */ 843 struct xfrm_dst 844 { 845 union { 846 struct dst_entry dst; 847 struct rtable rt; 848 struct rt6_info rt6; 849 } u; 850 struct dst_entry *route; 851 #ifdef CONFIG_XFRM_SUB_POLICY 852 struct flowi *origin; 853 struct xfrm_selector *partner; 854 #endif 855 u32 genid; 856 u32 route_mtu_cached; 857 u32 child_mtu_cached; 858 u32 route_cookie; 859 u32 path_cookie; 860 }; 861 862 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 863 { 864 dst_release(xdst->route); 865 if (likely(xdst->u.dst.xfrm)) 866 xfrm_state_put(xdst->u.dst.xfrm); 867 #ifdef CONFIG_XFRM_SUB_POLICY 868 kfree(xdst->origin); 869 xdst->origin = NULL; 870 kfree(xdst->partner); 871 xdst->partner = NULL; 872 #endif 873 } 874 875 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 876 877 struct sec_path 878 { 879 atomic_t refcnt; 880 int len; 881 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 882 }; 883 884 static inline struct sec_path * 885 secpath_get(struct sec_path *sp) 886 { 887 if (sp) 888 atomic_inc(&sp->refcnt); 889 return sp; 890 } 891 892 extern void __secpath_destroy(struct sec_path *sp); 893 894 static inline void 895 secpath_put(struct sec_path *sp) 896 { 897 if (sp && atomic_dec_and_test(&sp->refcnt)) 898 __secpath_destroy(sp); 899 } 900 901 extern struct sec_path *secpath_dup(struct sec_path *src); 902 903 static inline void 904 secpath_reset(struct sk_buff *skb) 905 { 906 #ifdef CONFIG_XFRM 907 secpath_put(skb->sp); 908 skb->sp = NULL; 909 #endif 910 } 911 912 static inline int 913 xfrm_addr_any(xfrm_address_t *addr, unsigned short family) 914 { 915 switch (family) { 916 case AF_INET: 917 return addr->a4 == 0; 918 case AF_INET6: 919 return ipv6_addr_any((struct in6_addr *)&addr->a6); 920 } 921 return 0; 922 } 923 924 static inline int 925 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 926 { 927 return (tmpl->saddr.a4 && 928 tmpl->saddr.a4 != x->props.saddr.a4); 929 } 930 931 static inline int 932 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 933 { 934 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 935 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 936 } 937 938 static inline int 939 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family) 940 { 941 switch (family) { 942 case AF_INET: 943 return __xfrm4_state_addr_cmp(tmpl, x); 944 case AF_INET6: 945 return __xfrm6_state_addr_cmp(tmpl, x); 946 } 947 return !0; 948 } 949 950 #ifdef CONFIG_XFRM 951 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); 952 953 static inline int __xfrm_policy_check2(struct sock *sk, int dir, 954 struct sk_buff *skb, 955 unsigned int family, int reverse) 956 { 957 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); 958 959 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 960 return __xfrm_policy_check(sk, ndir, skb, family); 961 962 return (!xfrm_policy_count[dir] && !skb->sp) || 963 (skb->dst->flags & DST_NOPOLICY) || 964 __xfrm_policy_check(sk, ndir, skb, family); 965 } 966 967 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 968 { 969 return __xfrm_policy_check2(sk, dir, skb, family, 0); 970 } 971 972 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 973 { 974 return xfrm_policy_check(sk, dir, skb, AF_INET); 975 } 976 977 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 978 { 979 return xfrm_policy_check(sk, dir, skb, AF_INET6); 980 } 981 982 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 983 struct sk_buff *skb) 984 { 985 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); 986 } 987 988 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 989 struct sk_buff *skb) 990 { 991 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); 992 } 993 994 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 995 unsigned int family, int reverse); 996 997 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 998 unsigned int family) 999 { 1000 return __xfrm_decode_session(skb, fl, family, 0); 1001 } 1002 1003 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1004 struct flowi *fl, 1005 unsigned int family) 1006 { 1007 return __xfrm_decode_session(skb, fl, family, 1); 1008 } 1009 1010 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 1011 1012 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 1013 { 1014 return !xfrm_policy_count[XFRM_POLICY_OUT] || 1015 (skb->dst->flags & DST_NOXFRM) || 1016 __xfrm_route_forward(skb, family); 1017 } 1018 1019 static inline int xfrm4_route_forward(struct sk_buff *skb) 1020 { 1021 return xfrm_route_forward(skb, AF_INET); 1022 } 1023 1024 static inline int xfrm6_route_forward(struct sk_buff *skb) 1025 { 1026 return xfrm_route_forward(skb, AF_INET6); 1027 } 1028 1029 extern int __xfrm_sk_clone_policy(struct sock *sk); 1030 1031 static inline int xfrm_sk_clone_policy(struct sock *sk) 1032 { 1033 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) 1034 return __xfrm_sk_clone_policy(sk); 1035 return 0; 1036 } 1037 1038 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 1039 1040 static inline void xfrm_sk_free_policy(struct sock *sk) 1041 { 1042 if (unlikely(sk->sk_policy[0] != NULL)) { 1043 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); 1044 sk->sk_policy[0] = NULL; 1045 } 1046 if (unlikely(sk->sk_policy[1] != NULL)) { 1047 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); 1048 sk->sk_policy[1] = NULL; 1049 } 1050 } 1051 1052 #else 1053 1054 static inline void xfrm_sk_free_policy(struct sock *sk) {} 1055 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } 1056 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 1057 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 1058 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1059 { 1060 return 1; 1061 } 1062 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1063 { 1064 return 1; 1065 } 1066 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1067 { 1068 return 1; 1069 } 1070 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1071 struct flowi *fl, 1072 unsigned int family) 1073 { 1074 return -ENOSYS; 1075 } 1076 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1077 struct sk_buff *skb) 1078 { 1079 return 1; 1080 } 1081 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1082 struct sk_buff *skb) 1083 { 1084 return 1; 1085 } 1086 #endif 1087 1088 static __inline__ 1089 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family) 1090 { 1091 switch (family){ 1092 case AF_INET: 1093 return (xfrm_address_t *)&fl->fl4_dst; 1094 case AF_INET6: 1095 return (xfrm_address_t *)&fl->fl6_dst; 1096 } 1097 return NULL; 1098 } 1099 1100 static __inline__ 1101 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family) 1102 { 1103 switch (family){ 1104 case AF_INET: 1105 return (xfrm_address_t *)&fl->fl4_src; 1106 case AF_INET6: 1107 return (xfrm_address_t *)&fl->fl6_src; 1108 } 1109 return NULL; 1110 } 1111 1112 static __inline__ 1113 void xfrm_flowi_addr_get(struct flowi *fl, 1114 xfrm_address_t *saddr, xfrm_address_t *daddr, 1115 unsigned short family) 1116 { 1117 switch(family) { 1118 case AF_INET: 1119 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4)); 1120 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4)); 1121 break; 1122 case AF_INET6: 1123 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src); 1124 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst); 1125 break; 1126 } 1127 } 1128 1129 static __inline__ int 1130 __xfrm4_state_addr_check(struct xfrm_state *x, 1131 xfrm_address_t *daddr, xfrm_address_t *saddr) 1132 { 1133 if (daddr->a4 == x->id.daddr.a4 && 1134 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 1135 return 1; 1136 return 0; 1137 } 1138 1139 static __inline__ int 1140 __xfrm6_state_addr_check(struct xfrm_state *x, 1141 xfrm_address_t *daddr, xfrm_address_t *saddr) 1142 { 1143 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 1144 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| 1145 ipv6_addr_any((struct in6_addr *)saddr) || 1146 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 1147 return 1; 1148 return 0; 1149 } 1150 1151 static __inline__ int 1152 xfrm_state_addr_check(struct xfrm_state *x, 1153 xfrm_address_t *daddr, xfrm_address_t *saddr, 1154 unsigned short family) 1155 { 1156 switch (family) { 1157 case AF_INET: 1158 return __xfrm4_state_addr_check(x, daddr, saddr); 1159 case AF_INET6: 1160 return __xfrm6_state_addr_check(x, daddr, saddr); 1161 } 1162 return 0; 1163 } 1164 1165 static __inline__ int 1166 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl, 1167 unsigned short family) 1168 { 1169 switch (family) { 1170 case AF_INET: 1171 return __xfrm4_state_addr_check(x, 1172 (xfrm_address_t *)&fl->fl4_dst, 1173 (xfrm_address_t *)&fl->fl4_src); 1174 case AF_INET6: 1175 return __xfrm6_state_addr_check(x, 1176 (xfrm_address_t *)&fl->fl6_dst, 1177 (xfrm_address_t *)&fl->fl6_src); 1178 } 1179 return 0; 1180 } 1181 1182 static inline int xfrm_state_kern(struct xfrm_state *x) 1183 { 1184 return atomic_read(&x->tunnel_users); 1185 } 1186 1187 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 1188 { 1189 return (!userproto || proto == userproto || 1190 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 1191 proto == IPPROTO_ESP || 1192 proto == IPPROTO_COMP))); 1193 } 1194 1195 /* 1196 * xfrm algorithm information 1197 */ 1198 struct xfrm_algo_aead_info { 1199 u16 icv_truncbits; 1200 }; 1201 1202 struct xfrm_algo_auth_info { 1203 u16 icv_truncbits; 1204 u16 icv_fullbits; 1205 }; 1206 1207 struct xfrm_algo_encr_info { 1208 u16 blockbits; 1209 u16 defkeybits; 1210 }; 1211 1212 struct xfrm_algo_comp_info { 1213 u16 threshold; 1214 }; 1215 1216 struct xfrm_algo_desc { 1217 char *name; 1218 char *compat; 1219 u8 available:1; 1220 union { 1221 struct xfrm_algo_aead_info aead; 1222 struct xfrm_algo_auth_info auth; 1223 struct xfrm_algo_encr_info encr; 1224 struct xfrm_algo_comp_info comp; 1225 } uinfo; 1226 struct sadb_alg desc; 1227 }; 1228 1229 /* XFRM tunnel handlers. */ 1230 struct xfrm_tunnel { 1231 int (*handler)(struct sk_buff *skb); 1232 int (*err_handler)(struct sk_buff *skb, __u32 info); 1233 1234 struct xfrm_tunnel *next; 1235 int priority; 1236 }; 1237 1238 struct xfrm6_tunnel { 1239 int (*handler)(struct sk_buff *skb); 1240 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1241 int type, int code, int offset, __be32 info); 1242 struct xfrm6_tunnel *next; 1243 int priority; 1244 }; 1245 1246 struct xfrm_state_walk { 1247 struct xfrm_state *state; 1248 int count; 1249 u8 proto; 1250 }; 1251 1252 struct xfrm_policy_walk { 1253 struct xfrm_policy *policy; 1254 int count; 1255 u8 type, cur_type; 1256 }; 1257 1258 extern void xfrm_init(void); 1259 extern void xfrm4_init(void); 1260 extern void xfrm_state_init(void); 1261 extern void xfrm4_state_init(void); 1262 #ifdef CONFIG_XFRM 1263 extern int xfrm6_init(void); 1264 extern void xfrm6_fini(void); 1265 extern int xfrm6_state_init(void); 1266 extern void xfrm6_state_fini(void); 1267 #else 1268 static inline int xfrm6_init(void) 1269 { 1270 return 0; 1271 } 1272 static inline void xfrm6_fini(void) 1273 { 1274 ; 1275 } 1276 #endif 1277 1278 #ifdef CONFIG_XFRM_STATISTICS 1279 extern int xfrm_proc_init(void); 1280 #endif 1281 1282 static inline void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto) 1283 { 1284 walk->proto = proto; 1285 walk->state = NULL; 1286 walk->count = 0; 1287 } 1288 1289 static inline void xfrm_state_walk_done(struct xfrm_state_walk *walk) 1290 { 1291 if (walk->state != NULL) { 1292 xfrm_state_put(walk->state); 1293 walk->state = NULL; 1294 } 1295 } 1296 1297 extern int xfrm_state_walk(struct xfrm_state_walk *walk, 1298 int (*func)(struct xfrm_state *, int, void*), void *); 1299 extern struct xfrm_state *xfrm_state_alloc(void); 1300 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, 1301 struct flowi *fl, struct xfrm_tmpl *tmpl, 1302 struct xfrm_policy *pol, int *err, 1303 unsigned short family); 1304 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr, 1305 xfrm_address_t *saddr, 1306 unsigned short family, 1307 u8 mode, u8 proto, u32 reqid); 1308 extern int xfrm_state_check_expire(struct xfrm_state *x); 1309 extern void xfrm_state_insert(struct xfrm_state *x); 1310 extern int xfrm_state_add(struct xfrm_state *x); 1311 extern int xfrm_state_update(struct xfrm_state *x); 1312 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family); 1313 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family); 1314 #ifdef CONFIG_XFRM_SUB_POLICY 1315 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 1316 int n, unsigned short family); 1317 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 1318 int n, unsigned short family); 1319 #else 1320 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 1321 int n, unsigned short family) 1322 { 1323 return -ENOSYS; 1324 } 1325 1326 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 1327 int n, unsigned short family) 1328 { 1329 return -ENOSYS; 1330 } 1331 #endif 1332 1333 struct xfrmk_sadinfo { 1334 u32 sadhcnt; /* current hash bkts */ 1335 u32 sadhmcnt; /* max allowed hash bkts */ 1336 u32 sadcnt; /* current running count */ 1337 }; 1338 1339 struct xfrmk_spdinfo { 1340 u32 incnt; 1341 u32 outcnt; 1342 u32 fwdcnt; 1343 u32 inscnt; 1344 u32 outscnt; 1345 u32 fwdscnt; 1346 u32 spdhcnt; 1347 u32 spdhmcnt; 1348 }; 1349 1350 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq); 1351 extern int xfrm_state_delete(struct xfrm_state *x); 1352 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info); 1353 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si); 1354 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si); 1355 extern int xfrm_replay_check(struct xfrm_state *x, 1356 struct sk_buff *skb, __be32 seq); 1357 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq); 1358 extern void xfrm_replay_notify(struct xfrm_state *x, int event); 1359 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); 1360 extern int xfrm_init_state(struct xfrm_state *x); 1361 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb); 1362 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, 1363 int encap_type); 1364 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr); 1365 extern int xfrm_output_resume(struct sk_buff *skb, int err); 1366 extern int xfrm_output(struct sk_buff *skb); 1367 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1368 extern int xfrm4_extract_header(struct sk_buff *skb); 1369 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1370 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1371 int encap_type); 1372 extern int xfrm4_transport_finish(struct sk_buff *skb, int async); 1373 extern int xfrm4_rcv(struct sk_buff *skb); 1374 1375 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1376 { 1377 return xfrm4_rcv_encap(skb, nexthdr, spi, 0); 1378 } 1379 1380 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1381 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb); 1382 extern int xfrm4_output(struct sk_buff *skb); 1383 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1384 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1385 extern int xfrm6_extract_header(struct sk_buff *skb); 1386 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1387 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi); 1388 extern int xfrm6_transport_finish(struct sk_buff *skb, int async); 1389 extern int xfrm6_rcv(struct sk_buff *skb); 1390 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1391 xfrm_address_t *saddr, u8 proto); 1392 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1393 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1394 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr); 1395 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr); 1396 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr); 1397 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1398 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb); 1399 extern int xfrm6_output(struct sk_buff *skb); 1400 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, 1401 u8 **prevhdr); 1402 1403 #ifdef CONFIG_XFRM 1404 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1405 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); 1406 #else 1407 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 1408 { 1409 return -ENOPROTOOPT; 1410 } 1411 1412 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb) 1413 { 1414 /* should not happen */ 1415 kfree_skb(skb); 1416 return 0; 1417 } 1418 #endif 1419 1420 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp); 1421 1422 static inline void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) 1423 { 1424 walk->cur_type = XFRM_POLICY_TYPE_MAIN; 1425 walk->type = type; 1426 walk->policy = NULL; 1427 walk->count = 0; 1428 } 1429 1430 static inline void xfrm_policy_walk_done(struct xfrm_policy_walk *walk) 1431 { 1432 if (walk->policy != NULL) { 1433 xfrm_pol_put(walk->policy); 1434 walk->policy = NULL; 1435 } 1436 } 1437 1438 extern int xfrm_policy_walk(struct xfrm_policy_walk *walk, 1439 int (*func)(struct xfrm_policy *, int, int, void*), void *); 1440 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1441 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, 1442 struct xfrm_selector *sel, 1443 struct xfrm_sec_ctx *ctx, int delete, 1444 int *err); 1445 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err); 1446 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info); 1447 u32 xfrm_get_acqseq(void); 1448 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 1449 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto, 1450 xfrm_address_t *daddr, xfrm_address_t *saddr, 1451 int create, unsigned short family); 1452 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1453 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst, 1454 struct flowi *fl, int family, int strict); 1455 1456 #ifdef CONFIG_XFRM_MIGRATE 1457 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 1458 struct xfrm_migrate *m, int num_bundles); 1459 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m); 1460 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, 1461 struct xfrm_migrate *m); 1462 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 1463 struct xfrm_migrate *m, int num_bundles); 1464 #endif 1465 1466 extern wait_queue_head_t km_waitq; 1467 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1468 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid); 1469 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 1470 1471 extern void xfrm_input_init(void); 1472 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1473 1474 extern void xfrm_probe_algs(void); 1475 extern int xfrm_count_auth_supported(void); 1476 extern int xfrm_count_enc_supported(void); 1477 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1478 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1479 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1480 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1481 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1482 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe); 1483 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe); 1484 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe); 1485 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len, 1486 int probe); 1487 1488 struct hash_desc; 1489 struct scatterlist; 1490 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *, 1491 unsigned int); 1492 1493 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm, 1494 int offset, int len, icv_update_fn_t icv_update); 1495 1496 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b, 1497 int family) 1498 { 1499 switch (family) { 1500 default: 1501 case AF_INET: 1502 return (__force __u32)a->a4 - (__force __u32)b->a4; 1503 case AF_INET6: 1504 return ipv6_addr_cmp((struct in6_addr *)a, 1505 (struct in6_addr *)b); 1506 } 1507 } 1508 1509 static inline int xfrm_policy_id2dir(u32 index) 1510 { 1511 return index & 7; 1512 } 1513 1514 static inline int xfrm_aevent_is_on(void) 1515 { 1516 struct sock *nlsk; 1517 int ret = 0; 1518 1519 rcu_read_lock(); 1520 nlsk = rcu_dereference(xfrm_nl); 1521 if (nlsk) 1522 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1523 rcu_read_unlock(); 1524 return ret; 1525 } 1526 1527 static inline int xfrm_alg_len(struct xfrm_algo *alg) 1528 { 1529 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1530 } 1531 1532 #ifdef CONFIG_XFRM_MIGRATE 1533 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1534 { 1535 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); 1536 } 1537 1538 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1539 { 1540 int i; 1541 for (i = 0; i < n; i++) 1542 xfrm_state_put(*(states + i)); 1543 } 1544 1545 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1546 { 1547 int i; 1548 for (i = 0; i < n; i++) 1549 xfrm_state_delete(*(states + i)); 1550 } 1551 #endif 1552 1553 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) 1554 { 1555 return skb->sp->xvec[skb->sp->len - 1]; 1556 } 1557 1558 #endif /* _NET_XFRM_H */ 1559