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 #define xfrm_audit_policy_add(x, r, a, se, s) do { ; } while (0) 652 #define xfrm_audit_policy_delete(x, r, a, se, s) do { ; } while (0) 653 #define xfrm_audit_state_add(x, r, a, se, s) do { ; } while (0) 654 #define xfrm_audit_state_delete(x, r, a, se, s) do { ; } while (0) 655 #define xfrm_audit_state_replay_overflow(x, s) do { ; } while (0) 656 #define xfrm_audit_state_notfound_simple(s, f) do { ; } while (0) 657 #define xfrm_audit_state_notfound(s, f, sp, sq) do { ; } while (0) 658 #define xfrm_audit_state_icvfail(x, s, p) do { ; } while (0) 659 #endif /* CONFIG_AUDITSYSCALL */ 660 661 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 662 { 663 if (likely(policy != NULL)) 664 atomic_inc(&policy->refcnt); 665 } 666 667 extern void xfrm_policy_destroy(struct xfrm_policy *policy); 668 669 static inline void xfrm_pol_put(struct xfrm_policy *policy) 670 { 671 if (atomic_dec_and_test(&policy->refcnt)) 672 xfrm_policy_destroy(policy); 673 } 674 675 #ifdef CONFIG_XFRM_SUB_POLICY 676 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 677 { 678 int i; 679 for (i = npols - 1; i >= 0; --i) 680 xfrm_pol_put(pols[i]); 681 } 682 #else 683 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 684 { 685 xfrm_pol_put(pols[0]); 686 } 687 #endif 688 689 extern void __xfrm_state_destroy(struct xfrm_state *); 690 691 static inline void __xfrm_state_put(struct xfrm_state *x) 692 { 693 atomic_dec(&x->refcnt); 694 } 695 696 static inline void xfrm_state_put(struct xfrm_state *x) 697 { 698 if (atomic_dec_and_test(&x->refcnt)) 699 __xfrm_state_destroy(x); 700 } 701 702 static inline void xfrm_state_hold(struct xfrm_state *x) 703 { 704 atomic_inc(&x->refcnt); 705 } 706 707 static __inline__ int addr_match(void *token1, void *token2, int prefixlen) 708 { 709 __be32 *a1 = token1; 710 __be32 *a2 = token2; 711 int pdw; 712 int pbi; 713 714 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */ 715 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 716 717 if (pdw) 718 if (memcmp(a1, a2, pdw << 2)) 719 return 0; 720 721 if (pbi) { 722 __be32 mask; 723 724 mask = htonl((0xffffffff) << (32 - pbi)); 725 726 if ((a1[pdw] ^ a2[pdw]) & mask) 727 return 0; 728 } 729 730 return 1; 731 } 732 733 static __inline__ 734 __be16 xfrm_flowi_sport(struct flowi *fl) 735 { 736 __be16 port; 737 switch(fl->proto) { 738 case IPPROTO_TCP: 739 case IPPROTO_UDP: 740 case IPPROTO_UDPLITE: 741 case IPPROTO_SCTP: 742 port = fl->fl_ip_sport; 743 break; 744 case IPPROTO_ICMP: 745 case IPPROTO_ICMPV6: 746 port = htons(fl->fl_icmp_type); 747 break; 748 case IPPROTO_MH: 749 port = htons(fl->fl_mh_type); 750 break; 751 default: 752 port = 0; /*XXX*/ 753 } 754 return port; 755 } 756 757 static __inline__ 758 __be16 xfrm_flowi_dport(struct flowi *fl) 759 { 760 __be16 port; 761 switch(fl->proto) { 762 case IPPROTO_TCP: 763 case IPPROTO_UDP: 764 case IPPROTO_UDPLITE: 765 case IPPROTO_SCTP: 766 port = fl->fl_ip_dport; 767 break; 768 case IPPROTO_ICMP: 769 case IPPROTO_ICMPV6: 770 port = htons(fl->fl_icmp_code); 771 break; 772 default: 773 port = 0; /*XXX*/ 774 } 775 return port; 776 } 777 778 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, 779 unsigned short family); 780 781 #ifdef CONFIG_SECURITY_NETWORK_XFRM 782 /* If neither has a context --> match 783 * Otherwise, both must have a context and the sids, doi, alg must match 784 */ 785 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 786 { 787 return ((!s1 && !s2) || 788 (s1 && s2 && 789 (s1->ctx_sid == s2->ctx_sid) && 790 (s1->ctx_doi == s2->ctx_doi) && 791 (s1->ctx_alg == s2->ctx_alg))); 792 } 793 #else 794 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 795 { 796 return 1; 797 } 798 #endif 799 800 /* A struct encoding bundle of transformations to apply to some set of flow. 801 * 802 * dst->child points to the next element of bundle. 803 * dst->xfrm points to an instanse of transformer. 804 * 805 * Due to unfortunate limitations of current routing cache, which we 806 * have no time to fix, it mirrors struct rtable and bound to the same 807 * routing key, including saddr,daddr. However, we can have many of 808 * bundles differing by session id. All the bundles grow from a parent 809 * policy rule. 810 */ 811 struct xfrm_dst 812 { 813 union { 814 struct dst_entry dst; 815 struct rtable rt; 816 struct rt6_info rt6; 817 } u; 818 struct dst_entry *route; 819 #ifdef CONFIG_XFRM_SUB_POLICY 820 struct flowi *origin; 821 struct xfrm_selector *partner; 822 #endif 823 u32 genid; 824 u32 route_mtu_cached; 825 u32 child_mtu_cached; 826 u32 route_cookie; 827 u32 path_cookie; 828 }; 829 830 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 831 { 832 dst_release(xdst->route); 833 if (likely(xdst->u.dst.xfrm)) 834 xfrm_state_put(xdst->u.dst.xfrm); 835 #ifdef CONFIG_XFRM_SUB_POLICY 836 kfree(xdst->origin); 837 xdst->origin = NULL; 838 kfree(xdst->partner); 839 xdst->partner = NULL; 840 #endif 841 } 842 843 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 844 845 struct sec_path 846 { 847 atomic_t refcnt; 848 int len; 849 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 850 }; 851 852 static inline struct sec_path * 853 secpath_get(struct sec_path *sp) 854 { 855 if (sp) 856 atomic_inc(&sp->refcnt); 857 return sp; 858 } 859 860 extern void __secpath_destroy(struct sec_path *sp); 861 862 static inline void 863 secpath_put(struct sec_path *sp) 864 { 865 if (sp && atomic_dec_and_test(&sp->refcnt)) 866 __secpath_destroy(sp); 867 } 868 869 extern struct sec_path *secpath_dup(struct sec_path *src); 870 871 static inline void 872 secpath_reset(struct sk_buff *skb) 873 { 874 #ifdef CONFIG_XFRM 875 secpath_put(skb->sp); 876 skb->sp = NULL; 877 #endif 878 } 879 880 static inline int 881 xfrm_addr_any(xfrm_address_t *addr, unsigned short family) 882 { 883 switch (family) { 884 case AF_INET: 885 return addr->a4 == 0; 886 case AF_INET6: 887 return ipv6_addr_any((struct in6_addr *)&addr->a6); 888 } 889 return 0; 890 } 891 892 static inline int 893 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 894 { 895 return (tmpl->saddr.a4 && 896 tmpl->saddr.a4 != x->props.saddr.a4); 897 } 898 899 static inline int 900 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 901 { 902 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 903 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 904 } 905 906 static inline int 907 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family) 908 { 909 switch (family) { 910 case AF_INET: 911 return __xfrm4_state_addr_cmp(tmpl, x); 912 case AF_INET6: 913 return __xfrm6_state_addr_cmp(tmpl, x); 914 } 915 return !0; 916 } 917 918 #ifdef CONFIG_XFRM 919 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); 920 921 static inline int __xfrm_policy_check2(struct sock *sk, int dir, 922 struct sk_buff *skb, 923 unsigned int family, int reverse) 924 { 925 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); 926 927 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 928 return __xfrm_policy_check(sk, ndir, skb, family); 929 930 return (!xfrm_policy_count[dir] && !skb->sp) || 931 (skb->dst->flags & DST_NOPOLICY) || 932 __xfrm_policy_check(sk, ndir, skb, family); 933 } 934 935 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 936 { 937 return __xfrm_policy_check2(sk, dir, skb, family, 0); 938 } 939 940 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 941 { 942 return xfrm_policy_check(sk, dir, skb, AF_INET); 943 } 944 945 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 946 { 947 return xfrm_policy_check(sk, dir, skb, AF_INET6); 948 } 949 950 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 951 struct sk_buff *skb) 952 { 953 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); 954 } 955 956 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 957 struct sk_buff *skb) 958 { 959 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); 960 } 961 962 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 963 unsigned int family, int reverse); 964 965 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 966 unsigned int family) 967 { 968 return __xfrm_decode_session(skb, fl, family, 0); 969 } 970 971 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 972 struct flowi *fl, 973 unsigned int family) 974 { 975 return __xfrm_decode_session(skb, fl, family, 1); 976 } 977 978 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 979 980 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 981 { 982 return !xfrm_policy_count[XFRM_POLICY_OUT] || 983 (skb->dst->flags & DST_NOXFRM) || 984 __xfrm_route_forward(skb, family); 985 } 986 987 static inline int xfrm4_route_forward(struct sk_buff *skb) 988 { 989 return xfrm_route_forward(skb, AF_INET); 990 } 991 992 static inline int xfrm6_route_forward(struct sk_buff *skb) 993 { 994 return xfrm_route_forward(skb, AF_INET6); 995 } 996 997 extern int __xfrm_sk_clone_policy(struct sock *sk); 998 999 static inline int xfrm_sk_clone_policy(struct sock *sk) 1000 { 1001 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) 1002 return __xfrm_sk_clone_policy(sk); 1003 return 0; 1004 } 1005 1006 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 1007 1008 static inline void xfrm_sk_free_policy(struct sock *sk) 1009 { 1010 if (unlikely(sk->sk_policy[0] != NULL)) { 1011 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); 1012 sk->sk_policy[0] = NULL; 1013 } 1014 if (unlikely(sk->sk_policy[1] != NULL)) { 1015 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); 1016 sk->sk_policy[1] = NULL; 1017 } 1018 } 1019 1020 #else 1021 1022 static inline void xfrm_sk_free_policy(struct sock *sk) {} 1023 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } 1024 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 1025 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 1026 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1027 { 1028 return 1; 1029 } 1030 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1031 { 1032 return 1; 1033 } 1034 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1035 { 1036 return 1; 1037 } 1038 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1039 struct flowi *fl, 1040 unsigned int family) 1041 { 1042 return -ENOSYS; 1043 } 1044 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1045 struct sk_buff *skb) 1046 { 1047 return 1; 1048 } 1049 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1050 struct sk_buff *skb) 1051 { 1052 return 1; 1053 } 1054 #endif 1055 1056 static __inline__ 1057 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family) 1058 { 1059 switch (family){ 1060 case AF_INET: 1061 return (xfrm_address_t *)&fl->fl4_dst; 1062 case AF_INET6: 1063 return (xfrm_address_t *)&fl->fl6_dst; 1064 } 1065 return NULL; 1066 } 1067 1068 static __inline__ 1069 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family) 1070 { 1071 switch (family){ 1072 case AF_INET: 1073 return (xfrm_address_t *)&fl->fl4_src; 1074 case AF_INET6: 1075 return (xfrm_address_t *)&fl->fl6_src; 1076 } 1077 return NULL; 1078 } 1079 1080 static __inline__ 1081 void xfrm_flowi_addr_get(struct flowi *fl, 1082 xfrm_address_t *saddr, xfrm_address_t *daddr, 1083 unsigned short family) 1084 { 1085 switch(family) { 1086 case AF_INET: 1087 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4)); 1088 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4)); 1089 break; 1090 case AF_INET6: 1091 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src); 1092 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst); 1093 break; 1094 } 1095 } 1096 1097 static __inline__ int 1098 __xfrm4_state_addr_check(struct xfrm_state *x, 1099 xfrm_address_t *daddr, xfrm_address_t *saddr) 1100 { 1101 if (daddr->a4 == x->id.daddr.a4 && 1102 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 1103 return 1; 1104 return 0; 1105 } 1106 1107 static __inline__ int 1108 __xfrm6_state_addr_check(struct xfrm_state *x, 1109 xfrm_address_t *daddr, xfrm_address_t *saddr) 1110 { 1111 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 1112 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| 1113 ipv6_addr_any((struct in6_addr *)saddr) || 1114 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 1115 return 1; 1116 return 0; 1117 } 1118 1119 static __inline__ int 1120 xfrm_state_addr_check(struct xfrm_state *x, 1121 xfrm_address_t *daddr, xfrm_address_t *saddr, 1122 unsigned short family) 1123 { 1124 switch (family) { 1125 case AF_INET: 1126 return __xfrm4_state_addr_check(x, daddr, saddr); 1127 case AF_INET6: 1128 return __xfrm6_state_addr_check(x, daddr, saddr); 1129 } 1130 return 0; 1131 } 1132 1133 static __inline__ int 1134 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl, 1135 unsigned short family) 1136 { 1137 switch (family) { 1138 case AF_INET: 1139 return __xfrm4_state_addr_check(x, 1140 (xfrm_address_t *)&fl->fl4_dst, 1141 (xfrm_address_t *)&fl->fl4_src); 1142 case AF_INET6: 1143 return __xfrm6_state_addr_check(x, 1144 (xfrm_address_t *)&fl->fl6_dst, 1145 (xfrm_address_t *)&fl->fl6_src); 1146 } 1147 return 0; 1148 } 1149 1150 static inline int xfrm_state_kern(struct xfrm_state *x) 1151 { 1152 return atomic_read(&x->tunnel_users); 1153 } 1154 1155 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 1156 { 1157 return (!userproto || proto == userproto || 1158 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 1159 proto == IPPROTO_ESP || 1160 proto == IPPROTO_COMP))); 1161 } 1162 1163 /* 1164 * xfrm algorithm information 1165 */ 1166 struct xfrm_algo_aead_info { 1167 u16 icv_truncbits; 1168 }; 1169 1170 struct xfrm_algo_auth_info { 1171 u16 icv_truncbits; 1172 u16 icv_fullbits; 1173 }; 1174 1175 struct xfrm_algo_encr_info { 1176 u16 blockbits; 1177 u16 defkeybits; 1178 }; 1179 1180 struct xfrm_algo_comp_info { 1181 u16 threshold; 1182 }; 1183 1184 struct xfrm_algo_desc { 1185 char *name; 1186 char *compat; 1187 u8 available:1; 1188 union { 1189 struct xfrm_algo_aead_info aead; 1190 struct xfrm_algo_auth_info auth; 1191 struct xfrm_algo_encr_info encr; 1192 struct xfrm_algo_comp_info comp; 1193 } uinfo; 1194 struct sadb_alg desc; 1195 }; 1196 1197 /* XFRM tunnel handlers. */ 1198 struct xfrm_tunnel { 1199 int (*handler)(struct sk_buff *skb); 1200 int (*err_handler)(struct sk_buff *skb, __u32 info); 1201 1202 struct xfrm_tunnel *next; 1203 int priority; 1204 }; 1205 1206 struct xfrm6_tunnel { 1207 int (*handler)(struct sk_buff *skb); 1208 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1209 int type, int code, int offset, __be32 info); 1210 struct xfrm6_tunnel *next; 1211 int priority; 1212 }; 1213 1214 struct xfrm_state_walk { 1215 struct xfrm_state *state; 1216 int count; 1217 u8 proto; 1218 }; 1219 1220 struct xfrm_policy_walk { 1221 struct xfrm_policy *policy; 1222 int count; 1223 u8 type, cur_type; 1224 }; 1225 1226 extern void xfrm_init(void); 1227 extern void xfrm4_init(void); 1228 extern void xfrm_state_init(void); 1229 extern void xfrm4_state_init(void); 1230 #ifdef CONFIG_XFRM 1231 extern int xfrm6_init(void); 1232 extern void xfrm6_fini(void); 1233 extern int xfrm6_state_init(void); 1234 extern void xfrm6_state_fini(void); 1235 #else 1236 static inline int xfrm6_init(void) 1237 { 1238 return 0; 1239 } 1240 static inline void xfrm6_fini(void) 1241 { 1242 ; 1243 } 1244 #endif 1245 1246 #ifdef CONFIG_XFRM_STATISTICS 1247 extern int xfrm_proc_init(void); 1248 #endif 1249 1250 static inline void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto) 1251 { 1252 walk->proto = proto; 1253 walk->state = NULL; 1254 walk->count = 0; 1255 } 1256 1257 static inline void xfrm_state_walk_done(struct xfrm_state_walk *walk) 1258 { 1259 if (walk->state != NULL) { 1260 xfrm_state_put(walk->state); 1261 walk->state = NULL; 1262 } 1263 } 1264 1265 extern int xfrm_state_walk(struct xfrm_state_walk *walk, 1266 int (*func)(struct xfrm_state *, int, void*), void *); 1267 extern struct xfrm_state *xfrm_state_alloc(void); 1268 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, 1269 struct flowi *fl, struct xfrm_tmpl *tmpl, 1270 struct xfrm_policy *pol, int *err, 1271 unsigned short family); 1272 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr, 1273 xfrm_address_t *saddr, 1274 unsigned short family, 1275 u8 mode, u8 proto, u32 reqid); 1276 extern int xfrm_state_check_expire(struct xfrm_state *x); 1277 extern void xfrm_state_insert(struct xfrm_state *x); 1278 extern int xfrm_state_add(struct xfrm_state *x); 1279 extern int xfrm_state_update(struct xfrm_state *x); 1280 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family); 1281 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family); 1282 #ifdef CONFIG_XFRM_SUB_POLICY 1283 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 1284 int n, unsigned short family); 1285 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 1286 int n, unsigned short family); 1287 #else 1288 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 1289 int n, unsigned short family) 1290 { 1291 return -ENOSYS; 1292 } 1293 1294 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 1295 int n, unsigned short family) 1296 { 1297 return -ENOSYS; 1298 } 1299 #endif 1300 1301 struct xfrmk_sadinfo { 1302 u32 sadhcnt; /* current hash bkts */ 1303 u32 sadhmcnt; /* max allowed hash bkts */ 1304 u32 sadcnt; /* current running count */ 1305 }; 1306 1307 struct xfrmk_spdinfo { 1308 u32 incnt; 1309 u32 outcnt; 1310 u32 fwdcnt; 1311 u32 inscnt; 1312 u32 outscnt; 1313 u32 fwdscnt; 1314 u32 spdhcnt; 1315 u32 spdhmcnt; 1316 }; 1317 1318 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq); 1319 extern int xfrm_state_delete(struct xfrm_state *x); 1320 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info); 1321 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si); 1322 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si); 1323 extern int xfrm_replay_check(struct xfrm_state *x, 1324 struct sk_buff *skb, __be32 seq); 1325 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq); 1326 extern void xfrm_replay_notify(struct xfrm_state *x, int event); 1327 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); 1328 extern int xfrm_init_state(struct xfrm_state *x); 1329 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb); 1330 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, 1331 int encap_type); 1332 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr); 1333 extern int xfrm_output_resume(struct sk_buff *skb, int err); 1334 extern int xfrm_output(struct sk_buff *skb); 1335 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1336 extern int xfrm4_extract_header(struct sk_buff *skb); 1337 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1338 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1339 int encap_type); 1340 extern int xfrm4_transport_finish(struct sk_buff *skb, int async); 1341 extern int xfrm4_rcv(struct sk_buff *skb); 1342 1343 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1344 { 1345 return xfrm4_rcv_encap(skb, nexthdr, spi, 0); 1346 } 1347 1348 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1349 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb); 1350 extern int xfrm4_output(struct sk_buff *skb); 1351 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1352 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1353 extern int xfrm6_extract_header(struct sk_buff *skb); 1354 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1355 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi); 1356 extern int xfrm6_transport_finish(struct sk_buff *skb, int async); 1357 extern int xfrm6_rcv(struct sk_buff *skb); 1358 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1359 xfrm_address_t *saddr, u8 proto); 1360 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1361 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1362 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr); 1363 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr); 1364 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr); 1365 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1366 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb); 1367 extern int xfrm6_output(struct sk_buff *skb); 1368 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, 1369 u8 **prevhdr); 1370 1371 #ifdef CONFIG_XFRM 1372 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1373 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); 1374 #else 1375 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 1376 { 1377 return -ENOPROTOOPT; 1378 } 1379 1380 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb) 1381 { 1382 /* should not happen */ 1383 kfree_skb(skb); 1384 return 0; 1385 } 1386 #endif 1387 1388 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp); 1389 1390 static inline void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) 1391 { 1392 walk->cur_type = XFRM_POLICY_TYPE_MAIN; 1393 walk->type = type; 1394 walk->policy = NULL; 1395 walk->count = 0; 1396 } 1397 1398 static inline void xfrm_policy_walk_done(struct xfrm_policy_walk *walk) 1399 { 1400 if (walk->policy != NULL) { 1401 xfrm_pol_put(walk->policy); 1402 walk->policy = NULL; 1403 } 1404 } 1405 1406 extern int xfrm_policy_walk(struct xfrm_policy_walk *walk, 1407 int (*func)(struct xfrm_policy *, int, int, void*), void *); 1408 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1409 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, 1410 struct xfrm_selector *sel, 1411 struct xfrm_sec_ctx *ctx, int delete, 1412 int *err); 1413 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err); 1414 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info); 1415 u32 xfrm_get_acqseq(void); 1416 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 1417 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto, 1418 xfrm_address_t *daddr, xfrm_address_t *saddr, 1419 int create, unsigned short family); 1420 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1421 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst, 1422 struct flowi *fl, int family, int strict); 1423 1424 #ifdef CONFIG_XFRM_MIGRATE 1425 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 1426 struct xfrm_migrate *m, int num_bundles); 1427 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m); 1428 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, 1429 struct xfrm_migrate *m); 1430 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 1431 struct xfrm_migrate *m, int num_bundles); 1432 #endif 1433 1434 extern wait_queue_head_t km_waitq; 1435 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1436 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid); 1437 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 1438 1439 extern void xfrm_input_init(void); 1440 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1441 1442 extern void xfrm_probe_algs(void); 1443 extern int xfrm_count_auth_supported(void); 1444 extern int xfrm_count_enc_supported(void); 1445 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1446 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1447 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1448 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1449 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1450 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe); 1451 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe); 1452 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe); 1453 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len, 1454 int probe); 1455 1456 struct hash_desc; 1457 struct scatterlist; 1458 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *, 1459 unsigned int); 1460 1461 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm, 1462 int offset, int len, icv_update_fn_t icv_update); 1463 1464 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b, 1465 int family) 1466 { 1467 switch (family) { 1468 default: 1469 case AF_INET: 1470 return (__force __u32)a->a4 - (__force __u32)b->a4; 1471 case AF_INET6: 1472 return ipv6_addr_cmp((struct in6_addr *)a, 1473 (struct in6_addr *)b); 1474 } 1475 } 1476 1477 static inline int xfrm_policy_id2dir(u32 index) 1478 { 1479 return index & 7; 1480 } 1481 1482 static inline int xfrm_aevent_is_on(void) 1483 { 1484 struct sock *nlsk; 1485 int ret = 0; 1486 1487 rcu_read_lock(); 1488 nlsk = rcu_dereference(xfrm_nl); 1489 if (nlsk) 1490 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1491 rcu_read_unlock(); 1492 return ret; 1493 } 1494 1495 static inline int xfrm_alg_len(struct xfrm_algo *alg) 1496 { 1497 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1498 } 1499 1500 #ifdef CONFIG_XFRM_MIGRATE 1501 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1502 { 1503 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); 1504 } 1505 1506 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1507 { 1508 int i; 1509 for (i = 0; i < n; i++) 1510 xfrm_state_put(*(states + i)); 1511 } 1512 1513 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1514 { 1515 int i; 1516 for (i = 0; i < n; i++) 1517 xfrm_state_delete(*(states + i)); 1518 } 1519 #endif 1520 1521 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) 1522 { 1523 return skb->sp->xvec[skb->sp->len - 1]; 1524 } 1525 1526 #endif /* _NET_XFRM_H */ 1527