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 #include <linux/slab.h> 16 17 #include <net/sock.h> 18 #include <net/dst.h> 19 #include <net/ip.h> 20 #include <net/route.h> 21 #include <net/ipv6.h> 22 #include <net/ip6_fib.h> 23 24 #include <linux/interrupt.h> 25 26 #ifdef CONFIG_XFRM_STATISTICS 27 #include <net/snmp.h> 28 #endif 29 30 #define XFRM_PROTO_ESP 50 31 #define XFRM_PROTO_AH 51 32 #define XFRM_PROTO_COMP 108 33 #define XFRM_PROTO_IPIP 4 34 #define XFRM_PROTO_IPV6 41 35 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING 36 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS 37 38 #define XFRM_ALIGN8(len) (((len) + 7) & ~7) 39 #define MODULE_ALIAS_XFRM_MODE(family, encap) \ 40 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap)) 41 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \ 42 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto)) 43 44 #ifdef CONFIG_XFRM_STATISTICS 45 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field) 46 #define XFRM_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field) 47 #define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field) 48 #else 49 #define XFRM_INC_STATS(net, field) ((void)(net)) 50 #define XFRM_INC_STATS_BH(net, field) ((void)(net)) 51 #define XFRM_INC_STATS_USER(net, field) ((void)(net)) 52 #endif 53 54 extern struct mutex xfrm_cfg_mutex; 55 56 /* Organization of SPD aka "XFRM rules" 57 ------------------------------------ 58 59 Basic objects: 60 - policy rule, struct xfrm_policy (=SPD entry) 61 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) 62 - instance of a transformer, struct xfrm_state (=SA) 63 - template to clone xfrm_state, struct xfrm_tmpl 64 65 SPD is plain linear list of xfrm_policy rules, ordered by priority. 66 (To be compatible with existing pfkeyv2 implementations, 67 many rules with priority of 0x7fffffff are allowed to exist and 68 such rules are ordered in an unpredictable way, thanks to bsd folks.) 69 70 Lookup is plain linear search until the first match with selector. 71 72 If "action" is "block", then we prohibit the flow, otherwise: 73 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, 74 policy entry has list of up to XFRM_MAX_DEPTH transformations, 75 described by templates xfrm_tmpl. Each template is resolved 76 to a complete xfrm_state (see below) and we pack bundle of transformations 77 to a dst_entry returned to requestor. 78 79 dst -. xfrm .-> xfrm_state #1 80 |---. child .-> dst -. xfrm .-> xfrm_state #2 81 |---. child .-> dst -. xfrm .-> xfrm_state #3 82 |---. child .-> NULL 83 84 Bundles are cached at xrfm_policy struct (field ->bundles). 85 86 87 Resolution of xrfm_tmpl 88 ----------------------- 89 Template contains: 90 1. ->mode Mode: transport or tunnel 91 2. ->id.proto Protocol: AH/ESP/IPCOMP 92 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. 93 Q: allow to resolve security gateway? 94 4. ->id.spi If not zero, static SPI. 95 5. ->saddr Local tunnel endpoint, ignored for transport mode. 96 6. ->algos List of allowed algos. Plain bitmask now. 97 Q: ealgos, aalgos, calgos. What a mess... 98 7. ->share Sharing mode. 99 Q: how to implement private sharing mode? To add struct sock* to 100 flow id? 101 102 Having this template we search through SAD searching for entries 103 with appropriate mode/proto/algo, permitted by selector. 104 If no appropriate entry found, it is requested from key manager. 105 106 PROBLEMS: 107 Q: How to find all the bundles referring to a physical path for 108 PMTU discovery? Seems, dst should contain list of all parents... 109 and enter to infinite locking hierarchy disaster. 110 No! It is easier, we will not search for them, let them find us. 111 We add genid to each dst plus pointer to genid of raw IP route, 112 pmtu disc will update pmtu on raw IP route and increase its genid. 113 dst_check() will see this for top level and trigger resyncing 114 metrics. Plus, it will be made via sk->sk_dst_cache. Solved. 115 */ 116 117 struct xfrm_state_walk { 118 struct list_head all; 119 u8 state; 120 union { 121 u8 dying; 122 u8 proto; 123 }; 124 u32 seq; 125 }; 126 127 /* Full description of state of transformer. */ 128 struct xfrm_state { 129 #ifdef CONFIG_NET_NS 130 struct net *xs_net; 131 #endif 132 union { 133 struct hlist_node gclist; 134 struct hlist_node bydst; 135 }; 136 struct hlist_node bysrc; 137 struct hlist_node byspi; 138 139 atomic_t refcnt; 140 spinlock_t lock; 141 142 struct xfrm_id id; 143 struct xfrm_selector sel; 144 struct xfrm_mark mark; 145 146 u32 genid; 147 148 /* Key manager bits */ 149 struct xfrm_state_walk km; 150 151 /* Parameters of this state. */ 152 struct { 153 u32 reqid; 154 u8 mode; 155 u8 replay_window; 156 u8 aalgo, ealgo, calgo; 157 u8 flags; 158 u16 family; 159 xfrm_address_t saddr; 160 int header_len; 161 int trailer_len; 162 } props; 163 164 struct xfrm_lifetime_cfg lft; 165 166 /* Data for transformer */ 167 struct xfrm_algo_auth *aalg; 168 struct xfrm_algo *ealg; 169 struct xfrm_algo *calg; 170 struct xfrm_algo_aead *aead; 171 172 /* Data for encapsulator */ 173 struct xfrm_encap_tmpl *encap; 174 175 /* Data for care-of address */ 176 xfrm_address_t *coaddr; 177 178 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 179 struct xfrm_state *tunnel; 180 181 /* If a tunnel, number of users + 1 */ 182 atomic_t tunnel_users; 183 184 /* State for replay detection */ 185 struct xfrm_replay_state replay; 186 187 /* Replay detection state at the time we sent the last notification */ 188 struct xfrm_replay_state preplay; 189 190 /* internal flag that only holds state for delayed aevent at the 191 * moment 192 */ 193 u32 xflags; 194 195 /* Replay detection notification settings */ 196 u32 replay_maxage; 197 u32 replay_maxdiff; 198 199 /* Replay detection notification timer */ 200 struct timer_list rtimer; 201 202 /* Statistics */ 203 struct xfrm_stats stats; 204 205 struct xfrm_lifetime_cur curlft; 206 struct tasklet_hrtimer mtimer; 207 208 /* Last used time */ 209 unsigned long lastused; 210 211 /* Reference to data common to all the instances of this 212 * transformer. */ 213 const struct xfrm_type *type; 214 struct xfrm_mode *inner_mode; 215 struct xfrm_mode *inner_mode_iaf; 216 struct xfrm_mode *outer_mode; 217 218 /* Security context */ 219 struct xfrm_sec_ctx *security; 220 221 /* Private data of this transformer, format is opaque, 222 * interpreted by xfrm_type methods. */ 223 void *data; 224 }; 225 226 static inline struct net *xs_net(struct xfrm_state *x) 227 { 228 return read_pnet(&x->xs_net); 229 } 230 231 /* xflags - make enum if more show up */ 232 #define XFRM_TIME_DEFER 1 233 234 enum { 235 XFRM_STATE_VOID, 236 XFRM_STATE_ACQ, 237 XFRM_STATE_VALID, 238 XFRM_STATE_ERROR, 239 XFRM_STATE_EXPIRED, 240 XFRM_STATE_DEAD 241 }; 242 243 /* callback structure passed from either netlink or pfkey */ 244 struct km_event { 245 union { 246 u32 hard; 247 u32 proto; 248 u32 byid; 249 u32 aevent; 250 u32 type; 251 } data; 252 253 u32 seq; 254 u32 pid; 255 u32 event; 256 struct net *net; 257 }; 258 259 struct net_device; 260 struct xfrm_type; 261 struct xfrm_dst; 262 struct xfrm_policy_afinfo { 263 unsigned short family; 264 struct dst_ops *dst_ops; 265 void (*garbage_collect)(struct net *net); 266 struct dst_entry *(*dst_lookup)(struct net *net, int tos, 267 xfrm_address_t *saddr, 268 xfrm_address_t *daddr); 269 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr); 270 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy); 271 void (*decode_session)(struct sk_buff *skb, 272 struct flowi *fl, 273 int reverse); 274 int (*get_tos)(struct flowi *fl); 275 int (*init_path)(struct xfrm_dst *path, 276 struct dst_entry *dst, 277 int nfheader_len); 278 int (*fill_dst)(struct xfrm_dst *xdst, 279 struct net_device *dev, 280 struct flowi *fl); 281 }; 282 283 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); 284 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); 285 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c); 286 extern void km_state_notify(struct xfrm_state *x, struct km_event *c); 287 288 struct xfrm_tmpl; 289 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); 290 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid); 291 extern int __xfrm_state_delete(struct xfrm_state *x); 292 293 struct xfrm_state_afinfo { 294 unsigned int family; 295 unsigned int proto; 296 __be16 eth_proto; 297 struct module *owner; 298 const struct xfrm_type *type_map[IPPROTO_MAX]; 299 struct xfrm_mode *mode_map[XFRM_MODE_MAX]; 300 int (*init_flags)(struct xfrm_state *x); 301 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl, 302 struct xfrm_tmpl *tmpl, 303 xfrm_address_t *daddr, xfrm_address_t *saddr); 304 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n); 305 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n); 306 int (*output)(struct sk_buff *skb); 307 int (*extract_input)(struct xfrm_state *x, 308 struct sk_buff *skb); 309 int (*extract_output)(struct xfrm_state *x, 310 struct sk_buff *skb); 311 int (*transport_finish)(struct sk_buff *skb, 312 int async); 313 }; 314 315 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 316 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 317 318 extern void xfrm_state_delete_tunnel(struct xfrm_state *x); 319 320 struct xfrm_type { 321 char *description; 322 struct module *owner; 323 u8 proto; 324 u8 flags; 325 #define XFRM_TYPE_NON_FRAGMENT 1 326 #define XFRM_TYPE_REPLAY_PROT 2 327 #define XFRM_TYPE_LOCAL_COADDR 4 328 #define XFRM_TYPE_REMOTE_COADDR 8 329 330 int (*init_state)(struct xfrm_state *x); 331 void (*destructor)(struct xfrm_state *); 332 int (*input)(struct xfrm_state *, struct sk_buff *skb); 333 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 334 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *); 335 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **); 336 /* Estimate maximal size of result of transformation of a dgram */ 337 u32 (*get_mtu)(struct xfrm_state *, int size); 338 }; 339 340 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family); 341 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); 342 343 struct xfrm_mode { 344 /* 345 * Remove encapsulation header. 346 * 347 * The IP header will be moved over the top of the encapsulation 348 * header. 349 * 350 * On entry, the transport header shall point to where the IP header 351 * should be and the network header shall be set to where the IP 352 * header currently is. skb->data shall point to the start of the 353 * payload. 354 */ 355 int (*input2)(struct xfrm_state *x, struct sk_buff *skb); 356 357 /* 358 * This is the actual input entry point. 359 * 360 * For transport mode and equivalent this would be identical to 361 * input2 (which does not need to be set). While tunnel mode 362 * and equivalent would set this to the tunnel encapsulation function 363 * xfrm4_prepare_input that would in turn call input2. 364 */ 365 int (*input)(struct xfrm_state *x, struct sk_buff *skb); 366 367 /* 368 * Add encapsulation header. 369 * 370 * On exit, the transport header will be set to the start of the 371 * encapsulation header to be filled in by x->type->output and 372 * the mac header will be set to the nextheader (protocol for 373 * IPv4) field of the extension header directly preceding the 374 * encapsulation header, or in its absence, that of the top IP 375 * header. The value of the network header will always point 376 * to the top IP header while skb->data will point to the payload. 377 */ 378 int (*output2)(struct xfrm_state *x,struct sk_buff *skb); 379 380 /* 381 * This is the actual output entry point. 382 * 383 * For transport mode and equivalent this would be identical to 384 * output2 (which does not need to be set). While tunnel mode 385 * and equivalent would set this to a tunnel encapsulation function 386 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn 387 * call output2. 388 */ 389 int (*output)(struct xfrm_state *x, struct sk_buff *skb); 390 391 struct xfrm_state_afinfo *afinfo; 392 struct module *owner; 393 unsigned int encap; 394 int flags; 395 }; 396 397 /* Flags for xfrm_mode. */ 398 enum { 399 XFRM_MODE_FLAG_TUNNEL = 1, 400 }; 401 402 extern int xfrm_register_mode(struct xfrm_mode *mode, int family); 403 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family); 404 405 static inline int xfrm_af2proto(unsigned int family) 406 { 407 switch(family) { 408 case AF_INET: 409 return IPPROTO_IPIP; 410 case AF_INET6: 411 return IPPROTO_IPV6; 412 default: 413 return 0; 414 } 415 } 416 417 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto) 418 { 419 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) || 420 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6)) 421 return x->inner_mode; 422 else 423 return x->inner_mode_iaf; 424 } 425 426 struct xfrm_tmpl { 427 /* id in template is interpreted as: 428 * daddr - destination of tunnel, may be zero for transport mode. 429 * spi - zero to acquire spi. Not zero if spi is static, then 430 * daddr must be fixed too. 431 * proto - AH/ESP/IPCOMP 432 */ 433 struct xfrm_id id; 434 435 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 436 xfrm_address_t saddr; 437 438 unsigned short encap_family; 439 440 u32 reqid; 441 442 /* Mode: transport, tunnel etc. */ 443 u8 mode; 444 445 /* Sharing mode: unique, this session only, this user only etc. */ 446 u8 share; 447 448 /* May skip this transfomration if no SA is found */ 449 u8 optional; 450 451 /* Skip aalgos/ealgos/calgos checks. */ 452 u8 allalgs; 453 454 /* Bit mask of algos allowed for acquisition */ 455 u32 aalgos; 456 u32 ealgos; 457 u32 calgos; 458 }; 459 460 #define XFRM_MAX_DEPTH 6 461 462 struct xfrm_policy_walk_entry { 463 struct list_head all; 464 u8 dead; 465 }; 466 467 struct xfrm_policy_walk { 468 struct xfrm_policy_walk_entry walk; 469 u8 type; 470 u32 seq; 471 }; 472 473 struct xfrm_policy { 474 #ifdef CONFIG_NET_NS 475 struct net *xp_net; 476 #endif 477 struct hlist_node bydst; 478 struct hlist_node byidx; 479 480 /* This lock only affects elements except for entry. */ 481 rwlock_t lock; 482 atomic_t refcnt; 483 struct timer_list timer; 484 485 u32 priority; 486 u32 index; 487 struct xfrm_mark mark; 488 struct xfrm_selector selector; 489 struct xfrm_lifetime_cfg lft; 490 struct xfrm_lifetime_cur curlft; 491 struct dst_entry *bundles; 492 struct xfrm_policy_walk_entry walk; 493 u8 type; 494 u8 action; 495 u8 flags; 496 u8 xfrm_nr; 497 u16 family; 498 struct xfrm_sec_ctx *security; 499 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 500 }; 501 502 static inline struct net *xp_net(struct xfrm_policy *xp) 503 { 504 return read_pnet(&xp->xp_net); 505 } 506 507 struct xfrm_kmaddress { 508 xfrm_address_t local; 509 xfrm_address_t remote; 510 u32 reserved; 511 u16 family; 512 }; 513 514 struct xfrm_migrate { 515 xfrm_address_t old_daddr; 516 xfrm_address_t old_saddr; 517 xfrm_address_t new_daddr; 518 xfrm_address_t new_saddr; 519 u8 proto; 520 u8 mode; 521 u16 reserved; 522 u32 reqid; 523 u16 old_family; 524 u16 new_family; 525 }; 526 527 #define XFRM_KM_TIMEOUT 30 528 /* which seqno */ 529 #define XFRM_REPLAY_SEQ 1 530 #define XFRM_REPLAY_OSEQ 2 531 #define XFRM_REPLAY_SEQ_MASK 3 532 /* what happened */ 533 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 534 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 535 536 /* default aevent timeout in units of 100ms */ 537 #define XFRM_AE_ETIME 10 538 /* Async Event timer multiplier */ 539 #define XFRM_AE_ETH_M 10 540 /* default seq threshold size */ 541 #define XFRM_AE_SEQT_SIZE 2 542 543 struct xfrm_mgr { 544 struct list_head list; 545 char *id; 546 int (*notify)(struct xfrm_state *x, struct km_event *c); 547 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); 548 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 549 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 550 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c); 551 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 552 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k); 553 }; 554 555 extern int xfrm_register_km(struct xfrm_mgr *km); 556 extern int xfrm_unregister_km(struct xfrm_mgr *km); 557 558 /* 559 * This structure is used for the duration where packets are being 560 * transformed by IPsec. As soon as the packet leaves IPsec the 561 * area beyond the generic IP part may be overwritten. 562 */ 563 struct xfrm_skb_cb { 564 union { 565 struct inet_skb_parm h4; 566 struct inet6_skb_parm h6; 567 } header; 568 569 /* Sequence number for replay protection. */ 570 union { 571 u64 output; 572 __be32 input; 573 } seq; 574 }; 575 576 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) 577 578 /* 579 * This structure is used by the afinfo prepare_input/prepare_output functions 580 * to transmit header information to the mode input/output functions. 581 */ 582 struct xfrm_mode_skb_cb { 583 union { 584 struct inet_skb_parm h4; 585 struct inet6_skb_parm h6; 586 } header; 587 588 /* Copied from header for IPv4, always set to zero and DF for IPv6. */ 589 __be16 id; 590 __be16 frag_off; 591 592 /* IP header length (excluding options or extension headers). */ 593 u8 ihl; 594 595 /* TOS for IPv4, class for IPv6. */ 596 u8 tos; 597 598 /* TTL for IPv4, hop limitfor IPv6. */ 599 u8 ttl; 600 601 /* Protocol for IPv4, NH for IPv6. */ 602 u8 protocol; 603 604 /* Option length for IPv4, zero for IPv6. */ 605 u8 optlen; 606 607 /* Used by IPv6 only, zero for IPv4. */ 608 u8 flow_lbl[3]; 609 }; 610 611 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0])) 612 613 /* 614 * This structure is used by the input processing to locate the SPI and 615 * related information. 616 */ 617 struct xfrm_spi_skb_cb { 618 union { 619 struct inet_skb_parm h4; 620 struct inet6_skb_parm h6; 621 } header; 622 623 unsigned int daddroff; 624 unsigned int family; 625 }; 626 627 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0])) 628 629 /* Audit Information */ 630 struct xfrm_audit { 631 u32 secid; 632 uid_t loginuid; 633 u32 sessionid; 634 }; 635 636 #ifdef CONFIG_AUDITSYSCALL 637 static inline struct audit_buffer *xfrm_audit_start(const char *op) 638 { 639 struct audit_buffer *audit_buf = NULL; 640 641 if (audit_enabled == 0) 642 return NULL; 643 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, 644 AUDIT_MAC_IPSEC_EVENT); 645 if (audit_buf == NULL) 646 return NULL; 647 audit_log_format(audit_buf, "op=%s", op); 648 return audit_buf; 649 } 650 651 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid, 652 struct audit_buffer *audit_buf) 653 { 654 char *secctx; 655 u32 secctx_len; 656 657 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses); 658 if (secid != 0 && 659 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) { 660 audit_log_format(audit_buf, " subj=%s", secctx); 661 security_release_secctx(secctx, secctx_len); 662 } else 663 audit_log_task_context(audit_buf); 664 } 665 666 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 667 u32 auid, u32 ses, u32 secid); 668 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 669 u32 auid, u32 ses, u32 secid); 670 extern void xfrm_audit_state_add(struct xfrm_state *x, int result, 671 u32 auid, u32 ses, u32 secid); 672 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result, 673 u32 auid, u32 ses, u32 secid); 674 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 675 struct sk_buff *skb); 676 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family); 677 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 678 __be32 net_spi, __be32 net_seq); 679 extern void xfrm_audit_state_icvfail(struct xfrm_state *x, 680 struct sk_buff *skb, u8 proto); 681 #else 682 683 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 684 u32 auid, u32 ses, u32 secid) 685 { 686 } 687 688 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 689 u32 auid, u32 ses, u32 secid) 690 { 691 } 692 693 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result, 694 u32 auid, u32 ses, u32 secid) 695 { 696 } 697 698 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result, 699 u32 auid, u32 ses, u32 secid) 700 { 701 } 702 703 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 704 struct sk_buff *skb) 705 { 706 } 707 708 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb, 709 u16 family) 710 { 711 } 712 713 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 714 __be32 net_spi, __be32 net_seq) 715 { 716 } 717 718 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x, 719 struct sk_buff *skb, u8 proto) 720 { 721 } 722 #endif /* CONFIG_AUDITSYSCALL */ 723 724 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 725 { 726 if (likely(policy != NULL)) 727 atomic_inc(&policy->refcnt); 728 } 729 730 extern void xfrm_policy_destroy(struct xfrm_policy *policy); 731 732 static inline void xfrm_pol_put(struct xfrm_policy *policy) 733 { 734 if (atomic_dec_and_test(&policy->refcnt)) 735 xfrm_policy_destroy(policy); 736 } 737 738 #ifdef CONFIG_XFRM_SUB_POLICY 739 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 740 { 741 int i; 742 for (i = npols - 1; i >= 0; --i) 743 xfrm_pol_put(pols[i]); 744 } 745 #else 746 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 747 { 748 xfrm_pol_put(pols[0]); 749 } 750 #endif 751 752 extern void __xfrm_state_destroy(struct xfrm_state *); 753 754 static inline void __xfrm_state_put(struct xfrm_state *x) 755 { 756 atomic_dec(&x->refcnt); 757 } 758 759 static inline void xfrm_state_put(struct xfrm_state *x) 760 { 761 if (atomic_dec_and_test(&x->refcnt)) 762 __xfrm_state_destroy(x); 763 } 764 765 static inline void xfrm_state_hold(struct xfrm_state *x) 766 { 767 atomic_inc(&x->refcnt); 768 } 769 770 static __inline__ int addr_match(void *token1, void *token2, int prefixlen) 771 { 772 __be32 *a1 = token1; 773 __be32 *a2 = token2; 774 int pdw; 775 int pbi; 776 777 pdw = prefixlen >> 5; /* num of whole u32 in prefix */ 778 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 779 780 if (pdw) 781 if (memcmp(a1, a2, pdw << 2)) 782 return 0; 783 784 if (pbi) { 785 __be32 mask; 786 787 mask = htonl((0xffffffff) << (32 - pbi)); 788 789 if ((a1[pdw] ^ a2[pdw]) & mask) 790 return 0; 791 } 792 793 return 1; 794 } 795 796 static __inline__ 797 __be16 xfrm_flowi_sport(struct flowi *fl) 798 { 799 __be16 port; 800 switch(fl->proto) { 801 case IPPROTO_TCP: 802 case IPPROTO_UDP: 803 case IPPROTO_UDPLITE: 804 case IPPROTO_SCTP: 805 port = fl->fl_ip_sport; 806 break; 807 case IPPROTO_ICMP: 808 case IPPROTO_ICMPV6: 809 port = htons(fl->fl_icmp_type); 810 break; 811 case IPPROTO_MH: 812 port = htons(fl->fl_mh_type); 813 break; 814 default: 815 port = 0; /*XXX*/ 816 } 817 return port; 818 } 819 820 static __inline__ 821 __be16 xfrm_flowi_dport(struct flowi *fl) 822 { 823 __be16 port; 824 switch(fl->proto) { 825 case IPPROTO_TCP: 826 case IPPROTO_UDP: 827 case IPPROTO_UDPLITE: 828 case IPPROTO_SCTP: 829 port = fl->fl_ip_dport; 830 break; 831 case IPPROTO_ICMP: 832 case IPPROTO_ICMPV6: 833 port = htons(fl->fl_icmp_code); 834 break; 835 default: 836 port = 0; /*XXX*/ 837 } 838 return port; 839 } 840 841 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, 842 unsigned short family); 843 844 #ifdef CONFIG_SECURITY_NETWORK_XFRM 845 /* If neither has a context --> match 846 * Otherwise, both must have a context and the sids, doi, alg must match 847 */ 848 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 849 { 850 return ((!s1 && !s2) || 851 (s1 && s2 && 852 (s1->ctx_sid == s2->ctx_sid) && 853 (s1->ctx_doi == s2->ctx_doi) && 854 (s1->ctx_alg == s2->ctx_alg))); 855 } 856 #else 857 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 858 { 859 return 1; 860 } 861 #endif 862 863 /* A struct encoding bundle of transformations to apply to some set of flow. 864 * 865 * dst->child points to the next element of bundle. 866 * dst->xfrm points to an instanse of transformer. 867 * 868 * Due to unfortunate limitations of current routing cache, which we 869 * have no time to fix, it mirrors struct rtable and bound to the same 870 * routing key, including saddr,daddr. However, we can have many of 871 * bundles differing by session id. All the bundles grow from a parent 872 * policy rule. 873 */ 874 struct xfrm_dst { 875 union { 876 struct dst_entry dst; 877 struct rtable rt; 878 struct rt6_info rt6; 879 } u; 880 struct dst_entry *route; 881 #ifdef CONFIG_XFRM_SUB_POLICY 882 struct flowi *origin; 883 struct xfrm_selector *partner; 884 #endif 885 u32 genid; 886 u32 route_mtu_cached; 887 u32 child_mtu_cached; 888 u32 route_cookie; 889 u32 path_cookie; 890 }; 891 892 #ifdef CONFIG_XFRM 893 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 894 { 895 dst_release(xdst->route); 896 if (likely(xdst->u.dst.xfrm)) 897 xfrm_state_put(xdst->u.dst.xfrm); 898 #ifdef CONFIG_XFRM_SUB_POLICY 899 kfree(xdst->origin); 900 xdst->origin = NULL; 901 kfree(xdst->partner); 902 xdst->partner = NULL; 903 #endif 904 } 905 #endif 906 907 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 908 909 struct sec_path { 910 atomic_t refcnt; 911 int len; 912 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 913 }; 914 915 static inline struct sec_path * 916 secpath_get(struct sec_path *sp) 917 { 918 if (sp) 919 atomic_inc(&sp->refcnt); 920 return sp; 921 } 922 923 extern void __secpath_destroy(struct sec_path *sp); 924 925 static inline void 926 secpath_put(struct sec_path *sp) 927 { 928 if (sp && atomic_dec_and_test(&sp->refcnt)) 929 __secpath_destroy(sp); 930 } 931 932 extern struct sec_path *secpath_dup(struct sec_path *src); 933 934 static inline void 935 secpath_reset(struct sk_buff *skb) 936 { 937 #ifdef CONFIG_XFRM 938 secpath_put(skb->sp); 939 skb->sp = NULL; 940 #endif 941 } 942 943 static inline int 944 xfrm_addr_any(xfrm_address_t *addr, unsigned short family) 945 { 946 switch (family) { 947 case AF_INET: 948 return addr->a4 == 0; 949 case AF_INET6: 950 return ipv6_addr_any((struct in6_addr *)&addr->a6); 951 } 952 return 0; 953 } 954 955 static inline int 956 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 957 { 958 return (tmpl->saddr.a4 && 959 tmpl->saddr.a4 != x->props.saddr.a4); 960 } 961 962 static inline int 963 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 964 { 965 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 966 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 967 } 968 969 static inline int 970 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family) 971 { 972 switch (family) { 973 case AF_INET: 974 return __xfrm4_state_addr_cmp(tmpl, x); 975 case AF_INET6: 976 return __xfrm6_state_addr_cmp(tmpl, x); 977 } 978 return !0; 979 } 980 981 #ifdef CONFIG_XFRM 982 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); 983 984 static inline int __xfrm_policy_check2(struct sock *sk, int dir, 985 struct sk_buff *skb, 986 unsigned int family, int reverse) 987 { 988 struct net *net = dev_net(skb->dev); 989 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); 990 991 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 992 return __xfrm_policy_check(sk, ndir, skb, family); 993 994 return (!net->xfrm.policy_count[dir] && !skb->sp) || 995 (skb_dst(skb)->flags & DST_NOPOLICY) || 996 __xfrm_policy_check(sk, ndir, skb, family); 997 } 998 999 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1000 { 1001 return __xfrm_policy_check2(sk, dir, skb, family, 0); 1002 } 1003 1004 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1005 { 1006 return xfrm_policy_check(sk, dir, skb, AF_INET); 1007 } 1008 1009 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1010 { 1011 return xfrm_policy_check(sk, dir, skb, AF_INET6); 1012 } 1013 1014 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1015 struct sk_buff *skb) 1016 { 1017 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); 1018 } 1019 1020 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1021 struct sk_buff *skb) 1022 { 1023 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); 1024 } 1025 1026 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1027 unsigned int family, int reverse); 1028 1029 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1030 unsigned int family) 1031 { 1032 return __xfrm_decode_session(skb, fl, family, 0); 1033 } 1034 1035 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1036 struct flowi *fl, 1037 unsigned int family) 1038 { 1039 return __xfrm_decode_session(skb, fl, family, 1); 1040 } 1041 1042 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 1043 1044 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 1045 { 1046 struct net *net = dev_net(skb->dev); 1047 1048 return !net->xfrm.policy_count[XFRM_POLICY_OUT] || 1049 (skb_dst(skb)->flags & DST_NOXFRM) || 1050 __xfrm_route_forward(skb, family); 1051 } 1052 1053 static inline int xfrm4_route_forward(struct sk_buff *skb) 1054 { 1055 return xfrm_route_forward(skb, AF_INET); 1056 } 1057 1058 static inline int xfrm6_route_forward(struct sk_buff *skb) 1059 { 1060 return xfrm_route_forward(skb, AF_INET6); 1061 } 1062 1063 extern int __xfrm_sk_clone_policy(struct sock *sk); 1064 1065 static inline int xfrm_sk_clone_policy(struct sock *sk) 1066 { 1067 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) 1068 return __xfrm_sk_clone_policy(sk); 1069 return 0; 1070 } 1071 1072 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 1073 1074 static inline void xfrm_sk_free_policy(struct sock *sk) 1075 { 1076 if (unlikely(sk->sk_policy[0] != NULL)) { 1077 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); 1078 sk->sk_policy[0] = NULL; 1079 } 1080 if (unlikely(sk->sk_policy[1] != NULL)) { 1081 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); 1082 sk->sk_policy[1] = NULL; 1083 } 1084 } 1085 1086 #else 1087 1088 static inline void xfrm_sk_free_policy(struct sock *sk) {} 1089 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } 1090 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 1091 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 1092 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1093 { 1094 return 1; 1095 } 1096 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1097 { 1098 return 1; 1099 } 1100 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1101 { 1102 return 1; 1103 } 1104 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1105 struct flowi *fl, 1106 unsigned int family) 1107 { 1108 return -ENOSYS; 1109 } 1110 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1111 struct sk_buff *skb) 1112 { 1113 return 1; 1114 } 1115 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1116 struct sk_buff *skb) 1117 { 1118 return 1; 1119 } 1120 #endif 1121 1122 static __inline__ 1123 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family) 1124 { 1125 switch (family){ 1126 case AF_INET: 1127 return (xfrm_address_t *)&fl->fl4_dst; 1128 case AF_INET6: 1129 return (xfrm_address_t *)&fl->fl6_dst; 1130 } 1131 return NULL; 1132 } 1133 1134 static __inline__ 1135 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family) 1136 { 1137 switch (family){ 1138 case AF_INET: 1139 return (xfrm_address_t *)&fl->fl4_src; 1140 case AF_INET6: 1141 return (xfrm_address_t *)&fl->fl6_src; 1142 } 1143 return NULL; 1144 } 1145 1146 static __inline__ 1147 void xfrm_flowi_addr_get(struct flowi *fl, 1148 xfrm_address_t *saddr, xfrm_address_t *daddr, 1149 unsigned short family) 1150 { 1151 switch(family) { 1152 case AF_INET: 1153 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4)); 1154 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4)); 1155 break; 1156 case AF_INET6: 1157 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src); 1158 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst); 1159 break; 1160 } 1161 } 1162 1163 static __inline__ int 1164 __xfrm4_state_addr_check(struct xfrm_state *x, 1165 xfrm_address_t *daddr, xfrm_address_t *saddr) 1166 { 1167 if (daddr->a4 == x->id.daddr.a4 && 1168 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 1169 return 1; 1170 return 0; 1171 } 1172 1173 static __inline__ int 1174 __xfrm6_state_addr_check(struct xfrm_state *x, 1175 xfrm_address_t *daddr, xfrm_address_t *saddr) 1176 { 1177 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 1178 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| 1179 ipv6_addr_any((struct in6_addr *)saddr) || 1180 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 1181 return 1; 1182 return 0; 1183 } 1184 1185 static __inline__ int 1186 xfrm_state_addr_check(struct xfrm_state *x, 1187 xfrm_address_t *daddr, xfrm_address_t *saddr, 1188 unsigned short family) 1189 { 1190 switch (family) { 1191 case AF_INET: 1192 return __xfrm4_state_addr_check(x, daddr, saddr); 1193 case AF_INET6: 1194 return __xfrm6_state_addr_check(x, daddr, saddr); 1195 } 1196 return 0; 1197 } 1198 1199 static __inline__ int 1200 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl, 1201 unsigned short family) 1202 { 1203 switch (family) { 1204 case AF_INET: 1205 return __xfrm4_state_addr_check(x, 1206 (xfrm_address_t *)&fl->fl4_dst, 1207 (xfrm_address_t *)&fl->fl4_src); 1208 case AF_INET6: 1209 return __xfrm6_state_addr_check(x, 1210 (xfrm_address_t *)&fl->fl6_dst, 1211 (xfrm_address_t *)&fl->fl6_src); 1212 } 1213 return 0; 1214 } 1215 1216 static inline int xfrm_state_kern(struct xfrm_state *x) 1217 { 1218 return atomic_read(&x->tunnel_users); 1219 } 1220 1221 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 1222 { 1223 return (!userproto || proto == userproto || 1224 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 1225 proto == IPPROTO_ESP || 1226 proto == IPPROTO_COMP))); 1227 } 1228 1229 /* 1230 * xfrm algorithm information 1231 */ 1232 struct xfrm_algo_aead_info { 1233 u16 icv_truncbits; 1234 }; 1235 1236 struct xfrm_algo_auth_info { 1237 u16 icv_truncbits; 1238 u16 icv_fullbits; 1239 }; 1240 1241 struct xfrm_algo_encr_info { 1242 u16 blockbits; 1243 u16 defkeybits; 1244 }; 1245 1246 struct xfrm_algo_comp_info { 1247 u16 threshold; 1248 }; 1249 1250 struct xfrm_algo_desc { 1251 char *name; 1252 char *compat; 1253 u8 available:1; 1254 union { 1255 struct xfrm_algo_aead_info aead; 1256 struct xfrm_algo_auth_info auth; 1257 struct xfrm_algo_encr_info encr; 1258 struct xfrm_algo_comp_info comp; 1259 } uinfo; 1260 struct sadb_alg desc; 1261 }; 1262 1263 /* XFRM tunnel handlers. */ 1264 struct xfrm_tunnel { 1265 int (*handler)(struct sk_buff *skb); 1266 int (*err_handler)(struct sk_buff *skb, u32 info); 1267 1268 struct xfrm_tunnel *next; 1269 int priority; 1270 }; 1271 1272 struct xfrm6_tunnel { 1273 int (*handler)(struct sk_buff *skb); 1274 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1275 u8 type, u8 code, int offset, __be32 info); 1276 struct xfrm6_tunnel *next; 1277 int priority; 1278 }; 1279 1280 extern void xfrm_init(void); 1281 extern void xfrm4_init(int rt_hash_size); 1282 extern int xfrm_state_init(struct net *net); 1283 extern void xfrm_state_fini(struct net *net); 1284 extern void xfrm4_state_init(void); 1285 #ifdef CONFIG_XFRM 1286 extern int xfrm6_init(void); 1287 extern void xfrm6_fini(void); 1288 extern int xfrm6_state_init(void); 1289 extern void xfrm6_state_fini(void); 1290 #else 1291 static inline int xfrm6_init(void) 1292 { 1293 return 0; 1294 } 1295 static inline void xfrm6_fini(void) 1296 { 1297 ; 1298 } 1299 #endif 1300 1301 #ifdef CONFIG_XFRM_STATISTICS 1302 extern int xfrm_proc_init(struct net *net); 1303 extern void xfrm_proc_fini(struct net *net); 1304 #endif 1305 1306 extern int xfrm_sysctl_init(struct net *net); 1307 #ifdef CONFIG_SYSCTL 1308 extern void xfrm_sysctl_fini(struct net *net); 1309 #else 1310 static inline void xfrm_sysctl_fini(struct net *net) 1311 { 1312 } 1313 #endif 1314 1315 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto); 1316 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1317 int (*func)(struct xfrm_state *, int, void*), void *); 1318 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk); 1319 extern struct xfrm_state *xfrm_state_alloc(struct net *net); 1320 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, 1321 struct flowi *fl, struct xfrm_tmpl *tmpl, 1322 struct xfrm_policy *pol, int *err, 1323 unsigned short family); 1324 extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, 1325 xfrm_address_t *daddr, 1326 xfrm_address_t *saddr, 1327 unsigned short family, 1328 u8 mode, u8 proto, u32 reqid); 1329 extern int xfrm_state_check_expire(struct xfrm_state *x); 1330 extern void xfrm_state_insert(struct xfrm_state *x); 1331 extern int xfrm_state_add(struct xfrm_state *x); 1332 extern int xfrm_state_update(struct xfrm_state *x); 1333 extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark, 1334 xfrm_address_t *daddr, __be32 spi, 1335 u8 proto, unsigned short family); 1336 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1337 xfrm_address_t *daddr, 1338 xfrm_address_t *saddr, 1339 u8 proto, 1340 unsigned short family); 1341 #ifdef CONFIG_XFRM_SUB_POLICY 1342 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 1343 int n, unsigned short family); 1344 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 1345 int n, unsigned short family); 1346 #else 1347 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 1348 int n, unsigned short family) 1349 { 1350 return -ENOSYS; 1351 } 1352 1353 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 1354 int n, unsigned short family) 1355 { 1356 return -ENOSYS; 1357 } 1358 #endif 1359 1360 struct xfrmk_sadinfo { 1361 u32 sadhcnt; /* current hash bkts */ 1362 u32 sadhmcnt; /* max allowed hash bkts */ 1363 u32 sadcnt; /* current running count */ 1364 }; 1365 1366 struct xfrmk_spdinfo { 1367 u32 incnt; 1368 u32 outcnt; 1369 u32 fwdcnt; 1370 u32 inscnt; 1371 u32 outscnt; 1372 u32 fwdscnt; 1373 u32 spdhcnt; 1374 u32 spdhmcnt; 1375 }; 1376 1377 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, 1378 u32 seq); 1379 extern int xfrm_state_delete(struct xfrm_state *x); 1380 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info); 1381 extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); 1382 extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); 1383 extern int xfrm_replay_check(struct xfrm_state *x, 1384 struct sk_buff *skb, __be32 seq); 1385 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq); 1386 extern void xfrm_replay_notify(struct xfrm_state *x, int event); 1387 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); 1388 extern int xfrm_init_state(struct xfrm_state *x); 1389 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb); 1390 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, 1391 int encap_type); 1392 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr); 1393 extern int xfrm_output_resume(struct sk_buff *skb, int err); 1394 extern int xfrm_output(struct sk_buff *skb); 1395 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1396 extern int xfrm4_extract_header(struct sk_buff *skb); 1397 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1398 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1399 int encap_type); 1400 extern int xfrm4_transport_finish(struct sk_buff *skb, int async); 1401 extern int xfrm4_rcv(struct sk_buff *skb); 1402 1403 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1404 { 1405 return xfrm4_rcv_encap(skb, nexthdr, spi, 0); 1406 } 1407 1408 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1409 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb); 1410 extern int xfrm4_output(struct sk_buff *skb); 1411 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1412 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1413 extern int xfrm6_extract_header(struct sk_buff *skb); 1414 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1415 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi); 1416 extern int xfrm6_transport_finish(struct sk_buff *skb, int async); 1417 extern int xfrm6_rcv(struct sk_buff *skb); 1418 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1419 xfrm_address_t *saddr, u8 proto); 1420 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1421 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1422 extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr); 1423 extern void xfrm6_tunnel_free_spi(struct net *net, xfrm_address_t *saddr); 1424 extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, xfrm_address_t *saddr); 1425 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1426 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb); 1427 extern int xfrm6_output(struct sk_buff *skb); 1428 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, 1429 u8 **prevhdr); 1430 1431 #ifdef CONFIG_XFRM 1432 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1433 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); 1434 #else 1435 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 1436 { 1437 return -ENOPROTOOPT; 1438 } 1439 1440 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb) 1441 { 1442 /* should not happen */ 1443 kfree_skb(skb); 1444 return 0; 1445 } 1446 #endif 1447 1448 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); 1449 1450 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); 1451 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, 1452 int (*func)(struct xfrm_policy *, int, int, void*), void *); 1453 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk); 1454 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1455 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, 1456 u8 type, int dir, 1457 struct xfrm_selector *sel, 1458 struct xfrm_sec_ctx *ctx, int delete, 1459 int *err); 1460 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err); 1461 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info); 1462 u32 xfrm_get_acqseq(void); 1463 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 1464 struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark, 1465 u8 mode, u32 reqid, u8 proto, 1466 xfrm_address_t *daddr, 1467 xfrm_address_t *saddr, int create, 1468 unsigned short family); 1469 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1470 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst, 1471 struct flowi *fl, int family, int strict); 1472 1473 #ifdef CONFIG_XFRM_MIGRATE 1474 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 1475 struct xfrm_migrate *m, int num_bundles, 1476 struct xfrm_kmaddress *k); 1477 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m); 1478 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, 1479 struct xfrm_migrate *m); 1480 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 1481 struct xfrm_migrate *m, int num_bundles, 1482 struct xfrm_kmaddress *k); 1483 #endif 1484 1485 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1486 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid); 1487 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 1488 1489 extern void xfrm_input_init(void); 1490 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1491 1492 extern void xfrm_probe_algs(void); 1493 extern int xfrm_count_auth_supported(void); 1494 extern int xfrm_count_enc_supported(void); 1495 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1496 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1497 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1498 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1499 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1500 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe); 1501 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe); 1502 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe); 1503 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len, 1504 int probe); 1505 1506 struct hash_desc; 1507 struct scatterlist; 1508 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *, 1509 unsigned int); 1510 1511 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b, 1512 int family) 1513 { 1514 switch (family) { 1515 default: 1516 case AF_INET: 1517 return (__force u32)a->a4 - (__force u32)b->a4; 1518 case AF_INET6: 1519 return ipv6_addr_cmp((struct in6_addr *)a, 1520 (struct in6_addr *)b); 1521 } 1522 } 1523 1524 static inline int xfrm_policy_id2dir(u32 index) 1525 { 1526 return index & 7; 1527 } 1528 1529 #ifdef CONFIG_XFRM 1530 static inline int xfrm_aevent_is_on(struct net *net) 1531 { 1532 struct sock *nlsk; 1533 int ret = 0; 1534 1535 rcu_read_lock(); 1536 nlsk = rcu_dereference(net->xfrm.nlsk); 1537 if (nlsk) 1538 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1539 rcu_read_unlock(); 1540 return ret; 1541 } 1542 #endif 1543 1544 static inline int xfrm_alg_len(struct xfrm_algo *alg) 1545 { 1546 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1547 } 1548 1549 static inline int xfrm_alg_auth_len(struct xfrm_algo_auth *alg) 1550 { 1551 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1552 } 1553 1554 #ifdef CONFIG_XFRM_MIGRATE 1555 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1556 { 1557 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); 1558 } 1559 1560 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig) 1561 { 1562 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL); 1563 } 1564 1565 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1566 { 1567 int i; 1568 for (i = 0; i < n; i++) 1569 xfrm_state_put(*(states + i)); 1570 } 1571 1572 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1573 { 1574 int i; 1575 for (i = 0; i < n; i++) 1576 xfrm_state_delete(*(states + i)); 1577 } 1578 #endif 1579 1580 #ifdef CONFIG_XFRM 1581 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) 1582 { 1583 return skb->sp->xvec[skb->sp->len - 1]; 1584 } 1585 #endif 1586 1587 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) 1588 { 1589 if (attrs[XFRMA_MARK]) 1590 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(m)); 1591 else 1592 m->v = m->m = 0; 1593 1594 return m->v & m->m; 1595 } 1596 1597 static inline int xfrm_mark_put(struct sk_buff *skb, struct xfrm_mark *m) 1598 { 1599 if (m->m | m->v) 1600 NLA_PUT(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); 1601 return 0; 1602 1603 nla_put_failure: 1604 return -1; 1605 } 1606 1607 #endif /* _NET_XFRM_H */ 1608