1 #ifndef _NET_XFRM_H 2 #define _NET_XFRM_H 3 4 #include <linux/compiler.h> 5 #include <linux/xfrm.h> 6 #include <linux/spinlock.h> 7 #include <linux/list.h> 8 #include <linux/skbuff.h> 9 #include <linux/socket.h> 10 #include <linux/pfkeyv2.h> 11 #include <linux/ipsec.h> 12 #include <linux/in6.h> 13 #include <linux/mutex.h> 14 #include <linux/audit.h> 15 16 #include <net/sock.h> 17 #include <net/dst.h> 18 #include <net/ip.h> 19 #include <net/route.h> 20 #include <net/ipv6.h> 21 #include <net/ip6_fib.h> 22 23 #include <linux/interrupt.h> 24 25 #ifdef CONFIG_XFRM_STATISTICS 26 #include <net/snmp.h> 27 #endif 28 29 #define XFRM_PROTO_ESP 50 30 #define XFRM_PROTO_AH 51 31 #define XFRM_PROTO_COMP 108 32 #define XFRM_PROTO_IPIP 4 33 #define XFRM_PROTO_IPV6 41 34 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING 35 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS 36 37 #define XFRM_ALIGN8(len) (((len) + 7) & ~7) 38 #define MODULE_ALIAS_XFRM_MODE(family, encap) \ 39 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap)) 40 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \ 41 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto)) 42 43 #ifdef CONFIG_XFRM_STATISTICS 44 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field) 45 #define XFRM_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field) 46 #define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field) 47 #else 48 #define XFRM_INC_STATS(net, field) ((void)(net)) 49 #define XFRM_INC_STATS_BH(net, field) ((void)(net)) 50 #define XFRM_INC_STATS_USER(net, field) ((void)(net)) 51 #endif 52 53 extern struct mutex xfrm_cfg_mutex; 54 55 /* Organization of SPD aka "XFRM rules" 56 ------------------------------------ 57 58 Basic objects: 59 - policy rule, struct xfrm_policy (=SPD entry) 60 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) 61 - instance of a transformer, struct xfrm_state (=SA) 62 - template to clone xfrm_state, struct xfrm_tmpl 63 64 SPD is plain linear list of xfrm_policy rules, ordered by priority. 65 (To be compatible with existing pfkeyv2 implementations, 66 many rules with priority of 0x7fffffff are allowed to exist and 67 such rules are ordered in an unpredictable way, thanks to bsd folks.) 68 69 Lookup is plain linear search until the first match with selector. 70 71 If "action" is "block", then we prohibit the flow, otherwise: 72 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, 73 policy entry has list of up to XFRM_MAX_DEPTH transformations, 74 described by templates xfrm_tmpl. Each template is resolved 75 to a complete xfrm_state (see below) and we pack bundle of transformations 76 to a dst_entry returned to requestor. 77 78 dst -. xfrm .-> xfrm_state #1 79 |---. child .-> dst -. xfrm .-> xfrm_state #2 80 |---. child .-> dst -. xfrm .-> xfrm_state #3 81 |---. child .-> NULL 82 83 Bundles are cached at xrfm_policy struct (field ->bundles). 84 85 86 Resolution of xrfm_tmpl 87 ----------------------- 88 Template contains: 89 1. ->mode Mode: transport or tunnel 90 2. ->id.proto Protocol: AH/ESP/IPCOMP 91 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. 92 Q: allow to resolve security gateway? 93 4. ->id.spi If not zero, static SPI. 94 5. ->saddr Local tunnel endpoint, ignored for transport mode. 95 6. ->algos List of allowed algos. Plain bitmask now. 96 Q: ealgos, aalgos, calgos. What a mess... 97 7. ->share Sharing mode. 98 Q: how to implement private sharing mode? To add struct sock* to 99 flow id? 100 101 Having this template we search through SAD searching for entries 102 with appropriate mode/proto/algo, permitted by selector. 103 If no appropriate entry found, it is requested from key manager. 104 105 PROBLEMS: 106 Q: How to find all the bundles referring to a physical path for 107 PMTU discovery? Seems, dst should contain list of all parents... 108 and enter to infinite locking hierarchy disaster. 109 No! It is easier, we will not search for them, let them find us. 110 We add genid to each dst plus pointer to genid of raw IP route, 111 pmtu disc will update pmtu on raw IP route and increase its genid. 112 dst_check() will see this for top level and trigger resyncing 113 metrics. Plus, it will be made via sk->sk_dst_cache. Solved. 114 */ 115 116 struct xfrm_state_walk { 117 struct list_head all; 118 u8 state; 119 union { 120 u8 dying; 121 u8 proto; 122 }; 123 u32 seq; 124 }; 125 126 /* Full description of state of transformer. */ 127 struct xfrm_state { 128 #ifdef CONFIG_NET_NS 129 struct net *xs_net; 130 #endif 131 union { 132 struct hlist_node gclist; 133 struct hlist_node bydst; 134 }; 135 struct hlist_node bysrc; 136 struct hlist_node byspi; 137 138 atomic_t refcnt; 139 spinlock_t lock; 140 141 struct xfrm_id id; 142 struct xfrm_selector sel; 143 struct xfrm_mark mark; 144 145 u32 genid; 146 147 /* Key manager bits */ 148 struct xfrm_state_walk km; 149 150 /* Parameters of this state. */ 151 struct { 152 u32 reqid; 153 u8 mode; 154 u8 replay_window; 155 u8 aalgo, ealgo, calgo; 156 u8 flags; 157 u16 family; 158 xfrm_address_t saddr; 159 int header_len; 160 int trailer_len; 161 } props; 162 163 struct xfrm_lifetime_cfg lft; 164 165 /* Data for transformer */ 166 struct xfrm_algo_auth *aalg; 167 struct xfrm_algo *ealg; 168 struct xfrm_algo *calg; 169 struct xfrm_algo_aead *aead; 170 171 /* Data for encapsulator */ 172 struct xfrm_encap_tmpl *encap; 173 174 /* Data for care-of address */ 175 xfrm_address_t *coaddr; 176 177 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 178 struct xfrm_state *tunnel; 179 180 /* If a tunnel, number of users + 1 */ 181 atomic_t tunnel_users; 182 183 /* State for replay detection */ 184 struct xfrm_replay_state replay; 185 186 /* Replay detection state at the time we sent the last notification */ 187 struct xfrm_replay_state preplay; 188 189 /* internal flag that only holds state for delayed aevent at the 190 * moment 191 */ 192 u32 xflags; 193 194 /* Replay detection notification settings */ 195 u32 replay_maxage; 196 u32 replay_maxdiff; 197 198 /* Replay detection notification timer */ 199 struct timer_list rtimer; 200 201 /* Statistics */ 202 struct xfrm_stats stats; 203 204 struct xfrm_lifetime_cur curlft; 205 struct tasklet_hrtimer mtimer; 206 207 /* Last used time */ 208 unsigned long lastused; 209 210 /* Reference to data common to all the instances of this 211 * transformer. */ 212 const struct xfrm_type *type; 213 struct xfrm_mode *inner_mode; 214 struct xfrm_mode *inner_mode_iaf; 215 struct xfrm_mode *outer_mode; 216 217 /* Security context */ 218 struct xfrm_sec_ctx *security; 219 220 /* Private data of this transformer, format is opaque, 221 * interpreted by xfrm_type methods. */ 222 void *data; 223 }; 224 225 static inline struct net *xs_net(struct xfrm_state *x) 226 { 227 return read_pnet(&x->xs_net); 228 } 229 230 /* xflags - make enum if more show up */ 231 #define XFRM_TIME_DEFER 1 232 233 enum { 234 XFRM_STATE_VOID, 235 XFRM_STATE_ACQ, 236 XFRM_STATE_VALID, 237 XFRM_STATE_ERROR, 238 XFRM_STATE_EXPIRED, 239 XFRM_STATE_DEAD 240 }; 241 242 /* callback structure passed from either netlink or pfkey */ 243 struct km_event { 244 union { 245 u32 hard; 246 u32 proto; 247 u32 byid; 248 u32 aevent; 249 u32 type; 250 } data; 251 252 u32 seq; 253 u32 pid; 254 u32 event; 255 struct net *net; 256 }; 257 258 struct net_device; 259 struct xfrm_type; 260 struct xfrm_dst; 261 struct xfrm_policy_afinfo { 262 unsigned short family; 263 struct dst_ops *dst_ops; 264 void (*garbage_collect)(struct net *net); 265 struct dst_entry *(*dst_lookup)(struct net *net, int tos, 266 xfrm_address_t *saddr, 267 xfrm_address_t *daddr); 268 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr); 269 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy); 270 void (*decode_session)(struct sk_buff *skb, 271 struct flowi *fl, 272 int reverse); 273 int (*get_tos)(struct flowi *fl); 274 int (*init_path)(struct xfrm_dst *path, 275 struct dst_entry *dst, 276 int nfheader_len); 277 int (*fill_dst)(struct xfrm_dst *xdst, 278 struct net_device *dev); 279 }; 280 281 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); 282 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); 283 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c); 284 extern void km_state_notify(struct xfrm_state *x, struct km_event *c); 285 286 struct xfrm_tmpl; 287 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); 288 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid); 289 extern int __xfrm_state_delete(struct xfrm_state *x); 290 291 struct xfrm_state_afinfo { 292 unsigned int family; 293 unsigned int proto; 294 __be16 eth_proto; 295 struct module *owner; 296 const struct xfrm_type *type_map[IPPROTO_MAX]; 297 struct xfrm_mode *mode_map[XFRM_MODE_MAX]; 298 int (*init_flags)(struct xfrm_state *x); 299 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl, 300 struct xfrm_tmpl *tmpl, 301 xfrm_address_t *daddr, xfrm_address_t *saddr); 302 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n); 303 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n); 304 int (*output)(struct sk_buff *skb); 305 int (*extract_input)(struct xfrm_state *x, 306 struct sk_buff *skb); 307 int (*extract_output)(struct xfrm_state *x, 308 struct sk_buff *skb); 309 int (*transport_finish)(struct sk_buff *skb, 310 int async); 311 }; 312 313 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 314 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 315 316 extern void xfrm_state_delete_tunnel(struct xfrm_state *x); 317 318 struct xfrm_type { 319 char *description; 320 struct module *owner; 321 u8 proto; 322 u8 flags; 323 #define XFRM_TYPE_NON_FRAGMENT 1 324 #define XFRM_TYPE_REPLAY_PROT 2 325 #define XFRM_TYPE_LOCAL_COADDR 4 326 #define XFRM_TYPE_REMOTE_COADDR 8 327 328 int (*init_state)(struct xfrm_state *x); 329 void (*destructor)(struct xfrm_state *); 330 int (*input)(struct xfrm_state *, struct sk_buff *skb); 331 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 332 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *); 333 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **); 334 /* Estimate maximal size of result of transformation of a dgram */ 335 u32 (*get_mtu)(struct xfrm_state *, int size); 336 }; 337 338 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family); 339 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); 340 341 struct xfrm_mode { 342 /* 343 * Remove encapsulation header. 344 * 345 * The IP header will be moved over the top of the encapsulation 346 * header. 347 * 348 * On entry, the transport header shall point to where the IP header 349 * should be and the network header shall be set to where the IP 350 * header currently is. skb->data shall point to the start of the 351 * payload. 352 */ 353 int (*input2)(struct xfrm_state *x, struct sk_buff *skb); 354 355 /* 356 * This is the actual input entry point. 357 * 358 * For transport mode and equivalent this would be identical to 359 * input2 (which does not need to be set). While tunnel mode 360 * and equivalent would set this to the tunnel encapsulation function 361 * xfrm4_prepare_input that would in turn call input2. 362 */ 363 int (*input)(struct xfrm_state *x, struct sk_buff *skb); 364 365 /* 366 * Add encapsulation header. 367 * 368 * On exit, the transport header will be set to the start of the 369 * encapsulation header to be filled in by x->type->output and 370 * the mac header will be set to the nextheader (protocol for 371 * IPv4) field of the extension header directly preceding the 372 * encapsulation header, or in its absence, that of the top IP 373 * header. The value of the network header will always point 374 * to the top IP header while skb->data will point to the payload. 375 */ 376 int (*output2)(struct xfrm_state *x,struct sk_buff *skb); 377 378 /* 379 * This is the actual output entry point. 380 * 381 * For transport mode and equivalent this would be identical to 382 * output2 (which does not need to be set). While tunnel mode 383 * and equivalent would set this to a tunnel encapsulation function 384 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn 385 * call output2. 386 */ 387 int (*output)(struct xfrm_state *x, struct sk_buff *skb); 388 389 struct xfrm_state_afinfo *afinfo; 390 struct module *owner; 391 unsigned int encap; 392 int flags; 393 }; 394 395 /* Flags for xfrm_mode. */ 396 enum { 397 XFRM_MODE_FLAG_TUNNEL = 1, 398 }; 399 400 extern int xfrm_register_mode(struct xfrm_mode *mode, int family); 401 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family); 402 403 static inline int xfrm_af2proto(unsigned int family) 404 { 405 switch(family) { 406 case AF_INET: 407 return IPPROTO_IPIP; 408 case AF_INET6: 409 return IPPROTO_IPV6; 410 default: 411 return 0; 412 } 413 } 414 415 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto) 416 { 417 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) || 418 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6)) 419 return x->inner_mode; 420 else 421 return x->inner_mode_iaf; 422 } 423 424 struct xfrm_tmpl { 425 /* id in template is interpreted as: 426 * daddr - destination of tunnel, may be zero for transport mode. 427 * spi - zero to acquire spi. Not zero if spi is static, then 428 * daddr must be fixed too. 429 * proto - AH/ESP/IPCOMP 430 */ 431 struct xfrm_id id; 432 433 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 434 xfrm_address_t saddr; 435 436 unsigned short encap_family; 437 438 u32 reqid; 439 440 /* Mode: transport, tunnel etc. */ 441 u8 mode; 442 443 /* Sharing mode: unique, this session only, this user only etc. */ 444 u8 share; 445 446 /* May skip this transfomration if no SA is found */ 447 u8 optional; 448 449 /* Skip aalgos/ealgos/calgos checks. */ 450 u8 allalgs; 451 452 /* Bit mask of algos allowed for acquisition */ 453 u32 aalgos; 454 u32 ealgos; 455 u32 calgos; 456 }; 457 458 #define XFRM_MAX_DEPTH 6 459 460 struct xfrm_policy_walk_entry { 461 struct list_head all; 462 u8 dead; 463 }; 464 465 struct xfrm_policy_walk { 466 struct xfrm_policy_walk_entry walk; 467 u8 type; 468 u32 seq; 469 }; 470 471 struct xfrm_policy { 472 #ifdef CONFIG_NET_NS 473 struct net *xp_net; 474 #endif 475 struct hlist_node bydst; 476 struct hlist_node byidx; 477 478 /* This lock only affects elements except for entry. */ 479 rwlock_t lock; 480 atomic_t refcnt; 481 struct timer_list timer; 482 483 u32 priority; 484 u32 index; 485 struct xfrm_mark mark; 486 struct xfrm_selector selector; 487 struct xfrm_lifetime_cfg lft; 488 struct xfrm_lifetime_cur curlft; 489 struct dst_entry *bundles; 490 struct xfrm_policy_walk_entry walk; 491 u8 type; 492 u8 action; 493 u8 flags; 494 u8 xfrm_nr; 495 u16 family; 496 struct xfrm_sec_ctx *security; 497 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 498 }; 499 500 static inline struct net *xp_net(struct xfrm_policy *xp) 501 { 502 return read_pnet(&xp->xp_net); 503 } 504 505 struct xfrm_kmaddress { 506 xfrm_address_t local; 507 xfrm_address_t remote; 508 u32 reserved; 509 u16 family; 510 }; 511 512 struct xfrm_migrate { 513 xfrm_address_t old_daddr; 514 xfrm_address_t old_saddr; 515 xfrm_address_t new_daddr; 516 xfrm_address_t new_saddr; 517 u8 proto; 518 u8 mode; 519 u16 reserved; 520 u32 reqid; 521 u16 old_family; 522 u16 new_family; 523 }; 524 525 #define XFRM_KM_TIMEOUT 30 526 /* which seqno */ 527 #define XFRM_REPLAY_SEQ 1 528 #define XFRM_REPLAY_OSEQ 2 529 #define XFRM_REPLAY_SEQ_MASK 3 530 /* what happened */ 531 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 532 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 533 534 /* default aevent timeout in units of 100ms */ 535 #define XFRM_AE_ETIME 10 536 /* Async Event timer multiplier */ 537 #define XFRM_AE_ETH_M 10 538 /* default seq threshold size */ 539 #define XFRM_AE_SEQT_SIZE 2 540 541 struct xfrm_mgr { 542 struct list_head list; 543 char *id; 544 int (*notify)(struct xfrm_state *x, struct km_event *c); 545 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); 546 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 547 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 548 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c); 549 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 550 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k); 551 }; 552 553 extern int xfrm_register_km(struct xfrm_mgr *km); 554 extern int xfrm_unregister_km(struct xfrm_mgr *km); 555 556 /* 557 * This structure is used for the duration where packets are being 558 * transformed by IPsec. As soon as the packet leaves IPsec the 559 * area beyond the generic IP part may be overwritten. 560 */ 561 struct xfrm_skb_cb { 562 union { 563 struct inet_skb_parm h4; 564 struct inet6_skb_parm h6; 565 } header; 566 567 /* Sequence number for replay protection. */ 568 union { 569 u64 output; 570 __be32 input; 571 } seq; 572 }; 573 574 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) 575 576 /* 577 * This structure is used by the afinfo prepare_input/prepare_output functions 578 * to transmit header information to the mode input/output functions. 579 */ 580 struct xfrm_mode_skb_cb { 581 union { 582 struct inet_skb_parm h4; 583 struct inet6_skb_parm h6; 584 } header; 585 586 /* Copied from header for IPv4, always set to zero and DF for IPv6. */ 587 __be16 id; 588 __be16 frag_off; 589 590 /* IP header length (excluding options or extension headers). */ 591 u8 ihl; 592 593 /* TOS for IPv4, class for IPv6. */ 594 u8 tos; 595 596 /* TTL for IPv4, hop limitfor IPv6. */ 597 u8 ttl; 598 599 /* Protocol for IPv4, NH for IPv6. */ 600 u8 protocol; 601 602 /* Option length for IPv4, zero for IPv6. */ 603 u8 optlen; 604 605 /* Used by IPv6 only, zero for IPv4. */ 606 u8 flow_lbl[3]; 607 }; 608 609 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0])) 610 611 /* 612 * This structure is used by the input processing to locate the SPI and 613 * related information. 614 */ 615 struct xfrm_spi_skb_cb { 616 union { 617 struct inet_skb_parm h4; 618 struct inet6_skb_parm h6; 619 } header; 620 621 unsigned int daddroff; 622 unsigned int family; 623 }; 624 625 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0])) 626 627 /* Audit Information */ 628 struct xfrm_audit { 629 u32 secid; 630 uid_t loginuid; 631 u32 sessionid; 632 }; 633 634 #ifdef CONFIG_AUDITSYSCALL 635 static inline struct audit_buffer *xfrm_audit_start(const char *op) 636 { 637 struct audit_buffer *audit_buf = NULL; 638 639 if (audit_enabled == 0) 640 return NULL; 641 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, 642 AUDIT_MAC_IPSEC_EVENT); 643 if (audit_buf == NULL) 644 return NULL; 645 audit_log_format(audit_buf, "op=%s", op); 646 return audit_buf; 647 } 648 649 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid, 650 struct audit_buffer *audit_buf) 651 { 652 char *secctx; 653 u32 secctx_len; 654 655 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses); 656 if (secid != 0 && 657 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) { 658 audit_log_format(audit_buf, " subj=%s", secctx); 659 security_release_secctx(secctx, secctx_len); 660 } else 661 audit_log_task_context(audit_buf); 662 } 663 664 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 665 u32 auid, u32 ses, u32 secid); 666 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 667 u32 auid, u32 ses, u32 secid); 668 extern void xfrm_audit_state_add(struct xfrm_state *x, int result, 669 u32 auid, u32 ses, u32 secid); 670 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result, 671 u32 auid, u32 ses, u32 secid); 672 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 673 struct sk_buff *skb); 674 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family); 675 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 676 __be32 net_spi, __be32 net_seq); 677 extern void xfrm_audit_state_icvfail(struct xfrm_state *x, 678 struct sk_buff *skb, u8 proto); 679 #else 680 681 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 682 u32 auid, u32 ses, u32 secid) 683 { 684 } 685 686 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 687 u32 auid, u32 ses, u32 secid) 688 { 689 } 690 691 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result, 692 u32 auid, u32 ses, u32 secid) 693 { 694 } 695 696 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result, 697 u32 auid, u32 ses, u32 secid) 698 { 699 } 700 701 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 702 struct sk_buff *skb) 703 { 704 } 705 706 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb, 707 u16 family) 708 { 709 } 710 711 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 712 __be32 net_spi, __be32 net_seq) 713 { 714 } 715 716 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x, 717 struct sk_buff *skb, u8 proto) 718 { 719 } 720 #endif /* CONFIG_AUDITSYSCALL */ 721 722 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 723 { 724 if (likely(policy != NULL)) 725 atomic_inc(&policy->refcnt); 726 } 727 728 extern void xfrm_policy_destroy(struct xfrm_policy *policy); 729 730 static inline void xfrm_pol_put(struct xfrm_policy *policy) 731 { 732 if (atomic_dec_and_test(&policy->refcnt)) 733 xfrm_policy_destroy(policy); 734 } 735 736 #ifdef CONFIG_XFRM_SUB_POLICY 737 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 738 { 739 int i; 740 for (i = npols - 1; i >= 0; --i) 741 xfrm_pol_put(pols[i]); 742 } 743 #else 744 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 745 { 746 xfrm_pol_put(pols[0]); 747 } 748 #endif 749 750 extern void __xfrm_state_destroy(struct xfrm_state *); 751 752 static inline void __xfrm_state_put(struct xfrm_state *x) 753 { 754 atomic_dec(&x->refcnt); 755 } 756 757 static inline void xfrm_state_put(struct xfrm_state *x) 758 { 759 if (atomic_dec_and_test(&x->refcnt)) 760 __xfrm_state_destroy(x); 761 } 762 763 static inline void xfrm_state_hold(struct xfrm_state *x) 764 { 765 atomic_inc(&x->refcnt); 766 } 767 768 static __inline__ int addr_match(void *token1, void *token2, int prefixlen) 769 { 770 __be32 *a1 = token1; 771 __be32 *a2 = token2; 772 int pdw; 773 int pbi; 774 775 pdw = prefixlen >> 5; /* num of whole u32 in prefix */ 776 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 777 778 if (pdw) 779 if (memcmp(a1, a2, pdw << 2)) 780 return 0; 781 782 if (pbi) { 783 __be32 mask; 784 785 mask = htonl((0xffffffff) << (32 - pbi)); 786 787 if ((a1[pdw] ^ a2[pdw]) & mask) 788 return 0; 789 } 790 791 return 1; 792 } 793 794 static __inline__ 795 __be16 xfrm_flowi_sport(struct flowi *fl) 796 { 797 __be16 port; 798 switch(fl->proto) { 799 case IPPROTO_TCP: 800 case IPPROTO_UDP: 801 case IPPROTO_UDPLITE: 802 case IPPROTO_SCTP: 803 port = fl->fl_ip_sport; 804 break; 805 case IPPROTO_ICMP: 806 case IPPROTO_ICMPV6: 807 port = htons(fl->fl_icmp_type); 808 break; 809 case IPPROTO_MH: 810 port = htons(fl->fl_mh_type); 811 break; 812 default: 813 port = 0; /*XXX*/ 814 } 815 return port; 816 } 817 818 static __inline__ 819 __be16 xfrm_flowi_dport(struct flowi *fl) 820 { 821 __be16 port; 822 switch(fl->proto) { 823 case IPPROTO_TCP: 824 case IPPROTO_UDP: 825 case IPPROTO_UDPLITE: 826 case IPPROTO_SCTP: 827 port = fl->fl_ip_dport; 828 break; 829 case IPPROTO_ICMP: 830 case IPPROTO_ICMPV6: 831 port = htons(fl->fl_icmp_code); 832 break; 833 default: 834 port = 0; /*XXX*/ 835 } 836 return port; 837 } 838 839 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, 840 unsigned short family); 841 842 #ifdef CONFIG_SECURITY_NETWORK_XFRM 843 /* If neither has a context --> match 844 * Otherwise, both must have a context and the sids, doi, alg must match 845 */ 846 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 847 { 848 return ((!s1 && !s2) || 849 (s1 && s2 && 850 (s1->ctx_sid == s2->ctx_sid) && 851 (s1->ctx_doi == s2->ctx_doi) && 852 (s1->ctx_alg == s2->ctx_alg))); 853 } 854 #else 855 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 856 { 857 return 1; 858 } 859 #endif 860 861 /* A struct encoding bundle of transformations to apply to some set of flow. 862 * 863 * dst->child points to the next element of bundle. 864 * dst->xfrm points to an instanse of transformer. 865 * 866 * Due to unfortunate limitations of current routing cache, which we 867 * have no time to fix, it mirrors struct rtable and bound to the same 868 * routing key, including saddr,daddr. However, we can have many of 869 * bundles differing by session id. All the bundles grow from a parent 870 * policy rule. 871 */ 872 struct xfrm_dst { 873 union { 874 struct dst_entry dst; 875 struct rtable rt; 876 struct rt6_info rt6; 877 } u; 878 struct dst_entry *route; 879 #ifdef CONFIG_XFRM_SUB_POLICY 880 struct flowi *origin; 881 struct xfrm_selector *partner; 882 #endif 883 u32 genid; 884 u32 route_mtu_cached; 885 u32 child_mtu_cached; 886 u32 route_cookie; 887 u32 path_cookie; 888 }; 889 890 #ifdef CONFIG_XFRM 891 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 892 { 893 dst_release(xdst->route); 894 if (likely(xdst->u.dst.xfrm)) 895 xfrm_state_put(xdst->u.dst.xfrm); 896 #ifdef CONFIG_XFRM_SUB_POLICY 897 kfree(xdst->origin); 898 xdst->origin = NULL; 899 kfree(xdst->partner); 900 xdst->partner = NULL; 901 #endif 902 } 903 #endif 904 905 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 906 907 struct sec_path { 908 atomic_t refcnt; 909 int len; 910 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 911 }; 912 913 static inline struct sec_path * 914 secpath_get(struct sec_path *sp) 915 { 916 if (sp) 917 atomic_inc(&sp->refcnt); 918 return sp; 919 } 920 921 extern void __secpath_destroy(struct sec_path *sp); 922 923 static inline void 924 secpath_put(struct sec_path *sp) 925 { 926 if (sp && atomic_dec_and_test(&sp->refcnt)) 927 __secpath_destroy(sp); 928 } 929 930 extern struct sec_path *secpath_dup(struct sec_path *src); 931 932 static inline void 933 secpath_reset(struct sk_buff *skb) 934 { 935 #ifdef CONFIG_XFRM 936 secpath_put(skb->sp); 937 skb->sp = NULL; 938 #endif 939 } 940 941 static inline int 942 xfrm_addr_any(xfrm_address_t *addr, unsigned short family) 943 { 944 switch (family) { 945 case AF_INET: 946 return addr->a4 == 0; 947 case AF_INET6: 948 return ipv6_addr_any((struct in6_addr *)&addr->a6); 949 } 950 return 0; 951 } 952 953 static inline int 954 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 955 { 956 return (tmpl->saddr.a4 && 957 tmpl->saddr.a4 != x->props.saddr.a4); 958 } 959 960 static inline int 961 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 962 { 963 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 964 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 965 } 966 967 static inline int 968 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family) 969 { 970 switch (family) { 971 case AF_INET: 972 return __xfrm4_state_addr_cmp(tmpl, x); 973 case AF_INET6: 974 return __xfrm6_state_addr_cmp(tmpl, x); 975 } 976 return !0; 977 } 978 979 #ifdef CONFIG_XFRM 980 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); 981 982 static inline int __xfrm_policy_check2(struct sock *sk, int dir, 983 struct sk_buff *skb, 984 unsigned int family, int reverse) 985 { 986 struct net *net = dev_net(skb->dev); 987 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); 988 989 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 990 return __xfrm_policy_check(sk, ndir, skb, family); 991 992 return (!net->xfrm.policy_count[dir] && !skb->sp) || 993 (skb_dst(skb)->flags & DST_NOPOLICY) || 994 __xfrm_policy_check(sk, ndir, skb, family); 995 } 996 997 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 998 { 999 return __xfrm_policy_check2(sk, dir, skb, family, 0); 1000 } 1001 1002 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1003 { 1004 return xfrm_policy_check(sk, dir, skb, AF_INET); 1005 } 1006 1007 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1008 { 1009 return xfrm_policy_check(sk, dir, skb, AF_INET6); 1010 } 1011 1012 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1013 struct sk_buff *skb) 1014 { 1015 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); 1016 } 1017 1018 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1019 struct sk_buff *skb) 1020 { 1021 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); 1022 } 1023 1024 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1025 unsigned int family, int reverse); 1026 1027 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1028 unsigned int family) 1029 { 1030 return __xfrm_decode_session(skb, fl, family, 0); 1031 } 1032 1033 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1034 struct flowi *fl, 1035 unsigned int family) 1036 { 1037 return __xfrm_decode_session(skb, fl, family, 1); 1038 } 1039 1040 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 1041 1042 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 1043 { 1044 struct net *net = dev_net(skb->dev); 1045 1046 return !net->xfrm.policy_count[XFRM_POLICY_OUT] || 1047 (skb_dst(skb)->flags & DST_NOXFRM) || 1048 __xfrm_route_forward(skb, family); 1049 } 1050 1051 static inline int xfrm4_route_forward(struct sk_buff *skb) 1052 { 1053 return xfrm_route_forward(skb, AF_INET); 1054 } 1055 1056 static inline int xfrm6_route_forward(struct sk_buff *skb) 1057 { 1058 return xfrm_route_forward(skb, AF_INET6); 1059 } 1060 1061 extern int __xfrm_sk_clone_policy(struct sock *sk); 1062 1063 static inline int xfrm_sk_clone_policy(struct sock *sk) 1064 { 1065 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) 1066 return __xfrm_sk_clone_policy(sk); 1067 return 0; 1068 } 1069 1070 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 1071 1072 static inline void xfrm_sk_free_policy(struct sock *sk) 1073 { 1074 if (unlikely(sk->sk_policy[0] != NULL)) { 1075 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); 1076 sk->sk_policy[0] = NULL; 1077 } 1078 if (unlikely(sk->sk_policy[1] != NULL)) { 1079 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); 1080 sk->sk_policy[1] = NULL; 1081 } 1082 } 1083 1084 #else 1085 1086 static inline void xfrm_sk_free_policy(struct sock *sk) {} 1087 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } 1088 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 1089 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 1090 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1091 { 1092 return 1; 1093 } 1094 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1095 { 1096 return 1; 1097 } 1098 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1099 { 1100 return 1; 1101 } 1102 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1103 struct flowi *fl, 1104 unsigned int family) 1105 { 1106 return -ENOSYS; 1107 } 1108 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1109 struct sk_buff *skb) 1110 { 1111 return 1; 1112 } 1113 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1114 struct sk_buff *skb) 1115 { 1116 return 1; 1117 } 1118 #endif 1119 1120 static __inline__ 1121 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family) 1122 { 1123 switch (family){ 1124 case AF_INET: 1125 return (xfrm_address_t *)&fl->fl4_dst; 1126 case AF_INET6: 1127 return (xfrm_address_t *)&fl->fl6_dst; 1128 } 1129 return NULL; 1130 } 1131 1132 static __inline__ 1133 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family) 1134 { 1135 switch (family){ 1136 case AF_INET: 1137 return (xfrm_address_t *)&fl->fl4_src; 1138 case AF_INET6: 1139 return (xfrm_address_t *)&fl->fl6_src; 1140 } 1141 return NULL; 1142 } 1143 1144 static __inline__ 1145 void xfrm_flowi_addr_get(struct flowi *fl, 1146 xfrm_address_t *saddr, xfrm_address_t *daddr, 1147 unsigned short family) 1148 { 1149 switch(family) { 1150 case AF_INET: 1151 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4)); 1152 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4)); 1153 break; 1154 case AF_INET6: 1155 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src); 1156 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst); 1157 break; 1158 } 1159 } 1160 1161 static __inline__ int 1162 __xfrm4_state_addr_check(struct xfrm_state *x, 1163 xfrm_address_t *daddr, xfrm_address_t *saddr) 1164 { 1165 if (daddr->a4 == x->id.daddr.a4 && 1166 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 1167 return 1; 1168 return 0; 1169 } 1170 1171 static __inline__ int 1172 __xfrm6_state_addr_check(struct xfrm_state *x, 1173 xfrm_address_t *daddr, xfrm_address_t *saddr) 1174 { 1175 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 1176 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| 1177 ipv6_addr_any((struct in6_addr *)saddr) || 1178 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 1179 return 1; 1180 return 0; 1181 } 1182 1183 static __inline__ int 1184 xfrm_state_addr_check(struct xfrm_state *x, 1185 xfrm_address_t *daddr, xfrm_address_t *saddr, 1186 unsigned short family) 1187 { 1188 switch (family) { 1189 case AF_INET: 1190 return __xfrm4_state_addr_check(x, daddr, saddr); 1191 case AF_INET6: 1192 return __xfrm6_state_addr_check(x, daddr, saddr); 1193 } 1194 return 0; 1195 } 1196 1197 static __inline__ int 1198 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl, 1199 unsigned short family) 1200 { 1201 switch (family) { 1202 case AF_INET: 1203 return __xfrm4_state_addr_check(x, 1204 (xfrm_address_t *)&fl->fl4_dst, 1205 (xfrm_address_t *)&fl->fl4_src); 1206 case AF_INET6: 1207 return __xfrm6_state_addr_check(x, 1208 (xfrm_address_t *)&fl->fl6_dst, 1209 (xfrm_address_t *)&fl->fl6_src); 1210 } 1211 return 0; 1212 } 1213 1214 static inline int xfrm_state_kern(struct xfrm_state *x) 1215 { 1216 return atomic_read(&x->tunnel_users); 1217 } 1218 1219 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 1220 { 1221 return (!userproto || proto == userproto || 1222 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 1223 proto == IPPROTO_ESP || 1224 proto == IPPROTO_COMP))); 1225 } 1226 1227 /* 1228 * xfrm algorithm information 1229 */ 1230 struct xfrm_algo_aead_info { 1231 u16 icv_truncbits; 1232 }; 1233 1234 struct xfrm_algo_auth_info { 1235 u16 icv_truncbits; 1236 u16 icv_fullbits; 1237 }; 1238 1239 struct xfrm_algo_encr_info { 1240 u16 blockbits; 1241 u16 defkeybits; 1242 }; 1243 1244 struct xfrm_algo_comp_info { 1245 u16 threshold; 1246 }; 1247 1248 struct xfrm_algo_desc { 1249 char *name; 1250 char *compat; 1251 u8 available:1; 1252 union { 1253 struct xfrm_algo_aead_info aead; 1254 struct xfrm_algo_auth_info auth; 1255 struct xfrm_algo_encr_info encr; 1256 struct xfrm_algo_comp_info comp; 1257 } uinfo; 1258 struct sadb_alg desc; 1259 }; 1260 1261 /* XFRM tunnel handlers. */ 1262 struct xfrm_tunnel { 1263 int (*handler)(struct sk_buff *skb); 1264 int (*err_handler)(struct sk_buff *skb, u32 info); 1265 1266 struct xfrm_tunnel *next; 1267 int priority; 1268 }; 1269 1270 struct xfrm6_tunnel { 1271 int (*handler)(struct sk_buff *skb); 1272 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1273 u8 type, u8 code, int offset, __be32 info); 1274 struct xfrm6_tunnel *next; 1275 int priority; 1276 }; 1277 1278 extern void xfrm_init(void); 1279 extern void xfrm4_init(int rt_hash_size); 1280 extern int xfrm_state_init(struct net *net); 1281 extern void xfrm_state_fini(struct net *net); 1282 extern void xfrm4_state_init(void); 1283 #ifdef CONFIG_XFRM 1284 extern int xfrm6_init(void); 1285 extern void xfrm6_fini(void); 1286 extern int xfrm6_state_init(void); 1287 extern void xfrm6_state_fini(void); 1288 #else 1289 static inline int xfrm6_init(void) 1290 { 1291 return 0; 1292 } 1293 static inline void xfrm6_fini(void) 1294 { 1295 ; 1296 } 1297 #endif 1298 1299 #ifdef CONFIG_XFRM_STATISTICS 1300 extern int xfrm_proc_init(struct net *net); 1301 extern void xfrm_proc_fini(struct net *net); 1302 #endif 1303 1304 extern int xfrm_sysctl_init(struct net *net); 1305 #ifdef CONFIG_SYSCTL 1306 extern void xfrm_sysctl_fini(struct net *net); 1307 #else 1308 static inline void xfrm_sysctl_fini(struct net *net) 1309 { 1310 } 1311 #endif 1312 1313 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto); 1314 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1315 int (*func)(struct xfrm_state *, int, void*), void *); 1316 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk); 1317 extern struct xfrm_state *xfrm_state_alloc(struct net *net); 1318 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, 1319 struct flowi *fl, struct xfrm_tmpl *tmpl, 1320 struct xfrm_policy *pol, int *err, 1321 unsigned short family); 1322 extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, 1323 xfrm_address_t *daddr, 1324 xfrm_address_t *saddr, 1325 unsigned short family, 1326 u8 mode, u8 proto, u32 reqid); 1327 extern int xfrm_state_check_expire(struct xfrm_state *x); 1328 extern void xfrm_state_insert(struct xfrm_state *x); 1329 extern int xfrm_state_add(struct xfrm_state *x); 1330 extern int xfrm_state_update(struct xfrm_state *x); 1331 extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark, 1332 xfrm_address_t *daddr, __be32 spi, 1333 u8 proto, unsigned short family); 1334 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1335 xfrm_address_t *daddr, 1336 xfrm_address_t *saddr, 1337 u8 proto, 1338 unsigned short family); 1339 #ifdef CONFIG_XFRM_SUB_POLICY 1340 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 1341 int n, unsigned short family); 1342 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 1343 int n, unsigned short family); 1344 #else 1345 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 1346 int n, unsigned short family) 1347 { 1348 return -ENOSYS; 1349 } 1350 1351 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 1352 int n, unsigned short family) 1353 { 1354 return -ENOSYS; 1355 } 1356 #endif 1357 1358 struct xfrmk_sadinfo { 1359 u32 sadhcnt; /* current hash bkts */ 1360 u32 sadhmcnt; /* max allowed hash bkts */ 1361 u32 sadcnt; /* current running count */ 1362 }; 1363 1364 struct xfrmk_spdinfo { 1365 u32 incnt; 1366 u32 outcnt; 1367 u32 fwdcnt; 1368 u32 inscnt; 1369 u32 outscnt; 1370 u32 fwdscnt; 1371 u32 spdhcnt; 1372 u32 spdhmcnt; 1373 }; 1374 1375 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, 1376 u32 seq); 1377 extern int xfrm_state_delete(struct xfrm_state *x); 1378 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info); 1379 extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); 1380 extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); 1381 extern int xfrm_replay_check(struct xfrm_state *x, 1382 struct sk_buff *skb, __be32 seq); 1383 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq); 1384 extern void xfrm_replay_notify(struct xfrm_state *x, int event); 1385 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); 1386 extern int xfrm_init_state(struct xfrm_state *x); 1387 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb); 1388 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, 1389 int encap_type); 1390 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr); 1391 extern int xfrm_output_resume(struct sk_buff *skb, int err); 1392 extern int xfrm_output(struct sk_buff *skb); 1393 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1394 extern int xfrm4_extract_header(struct sk_buff *skb); 1395 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1396 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1397 int encap_type); 1398 extern int xfrm4_transport_finish(struct sk_buff *skb, int async); 1399 extern int xfrm4_rcv(struct sk_buff *skb); 1400 1401 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1402 { 1403 return xfrm4_rcv_encap(skb, nexthdr, spi, 0); 1404 } 1405 1406 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1407 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb); 1408 extern int xfrm4_output(struct sk_buff *skb); 1409 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1410 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1411 extern int xfrm6_extract_header(struct sk_buff *skb); 1412 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1413 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi); 1414 extern int xfrm6_transport_finish(struct sk_buff *skb, int async); 1415 extern int xfrm6_rcv(struct sk_buff *skb); 1416 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1417 xfrm_address_t *saddr, u8 proto); 1418 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1419 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1420 extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr); 1421 extern void xfrm6_tunnel_free_spi(struct net *net, xfrm_address_t *saddr); 1422 extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, xfrm_address_t *saddr); 1423 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1424 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb); 1425 extern int xfrm6_output(struct sk_buff *skb); 1426 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, 1427 u8 **prevhdr); 1428 1429 #ifdef CONFIG_XFRM 1430 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1431 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); 1432 #else 1433 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 1434 { 1435 return -ENOPROTOOPT; 1436 } 1437 1438 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb) 1439 { 1440 /* should not happen */ 1441 kfree_skb(skb); 1442 return 0; 1443 } 1444 #endif 1445 1446 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); 1447 1448 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); 1449 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, 1450 int (*func)(struct xfrm_policy *, int, int, void*), void *); 1451 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk); 1452 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1453 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, 1454 u8 type, int dir, 1455 struct xfrm_selector *sel, 1456 struct xfrm_sec_ctx *ctx, int delete, 1457 int *err); 1458 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err); 1459 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info); 1460 u32 xfrm_get_acqseq(void); 1461 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 1462 struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark, 1463 u8 mode, u32 reqid, u8 proto, 1464 xfrm_address_t *daddr, 1465 xfrm_address_t *saddr, int create, 1466 unsigned short family); 1467 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1468 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst, 1469 struct flowi *fl, int family, int strict); 1470 1471 #ifdef CONFIG_XFRM_MIGRATE 1472 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 1473 struct xfrm_migrate *m, int num_bundles, 1474 struct xfrm_kmaddress *k); 1475 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m); 1476 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, 1477 struct xfrm_migrate *m); 1478 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 1479 struct xfrm_migrate *m, int num_bundles, 1480 struct xfrm_kmaddress *k); 1481 #endif 1482 1483 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1484 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid); 1485 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 1486 1487 extern void xfrm_input_init(void); 1488 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1489 1490 extern void xfrm_probe_algs(void); 1491 extern int xfrm_count_auth_supported(void); 1492 extern int xfrm_count_enc_supported(void); 1493 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1494 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1495 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1496 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1497 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1498 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe); 1499 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe); 1500 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe); 1501 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len, 1502 int probe); 1503 1504 struct hash_desc; 1505 struct scatterlist; 1506 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *, 1507 unsigned int); 1508 1509 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b, 1510 int family) 1511 { 1512 switch (family) { 1513 default: 1514 case AF_INET: 1515 return (__force u32)a->a4 - (__force u32)b->a4; 1516 case AF_INET6: 1517 return ipv6_addr_cmp((struct in6_addr *)a, 1518 (struct in6_addr *)b); 1519 } 1520 } 1521 1522 static inline int xfrm_policy_id2dir(u32 index) 1523 { 1524 return index & 7; 1525 } 1526 1527 #ifdef CONFIG_XFRM 1528 static inline int xfrm_aevent_is_on(struct net *net) 1529 { 1530 struct sock *nlsk; 1531 int ret = 0; 1532 1533 rcu_read_lock(); 1534 nlsk = rcu_dereference(net->xfrm.nlsk); 1535 if (nlsk) 1536 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1537 rcu_read_unlock(); 1538 return ret; 1539 } 1540 #endif 1541 1542 static inline int xfrm_alg_len(struct xfrm_algo *alg) 1543 { 1544 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1545 } 1546 1547 static inline int xfrm_alg_auth_len(struct xfrm_algo_auth *alg) 1548 { 1549 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1550 } 1551 1552 #ifdef CONFIG_XFRM_MIGRATE 1553 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1554 { 1555 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); 1556 } 1557 1558 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig) 1559 { 1560 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL); 1561 } 1562 1563 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1564 { 1565 int i; 1566 for (i = 0; i < n; i++) 1567 xfrm_state_put(*(states + i)); 1568 } 1569 1570 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1571 { 1572 int i; 1573 for (i = 0; i < n; i++) 1574 xfrm_state_delete(*(states + i)); 1575 } 1576 #endif 1577 1578 #ifdef CONFIG_XFRM 1579 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) 1580 { 1581 return skb->sp->xvec[skb->sp->len - 1]; 1582 } 1583 #endif 1584 1585 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) 1586 { 1587 if (attrs[XFRMA_MARK]) 1588 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(m)); 1589 else 1590 m->v = m->m = 0; 1591 1592 return m->v & m->m; 1593 } 1594 1595 static inline int xfrm_mark_put(struct sk_buff *skb, struct xfrm_mark *m) 1596 { 1597 if (m->m | m->v) 1598 NLA_PUT(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); 1599 return 0; 1600 1601 nla_put_failure: 1602 return -1; 1603 } 1604 1605 #endif /* _NET_XFRM_H */ 1606