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 #include <net/flow.h> 24 25 #include <linux/interrupt.h> 26 27 #ifdef CONFIG_XFRM_STATISTICS 28 #include <net/snmp.h> 29 #endif 30 31 #define XFRM_PROTO_ESP 50 32 #define XFRM_PROTO_AH 51 33 #define XFRM_PROTO_COMP 108 34 #define XFRM_PROTO_IPIP 4 35 #define XFRM_PROTO_IPV6 41 36 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING 37 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS 38 39 #define XFRM_ALIGN4(len) (((len) + 3) & ~3) 40 #define XFRM_ALIGN8(len) (((len) + 7) & ~7) 41 #define MODULE_ALIAS_XFRM_MODE(family, encap) \ 42 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap)) 43 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \ 44 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto)) 45 46 #ifdef CONFIG_XFRM_STATISTICS 47 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field) 48 #define XFRM_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field) 49 #define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field) 50 #else 51 #define XFRM_INC_STATS(net, field) ((void)(net)) 52 #define XFRM_INC_STATS_BH(net, field) ((void)(net)) 53 #define XFRM_INC_STATS_USER(net, field) ((void)(net)) 54 #endif 55 56 extern struct mutex xfrm_cfg_mutex; 57 58 /* Organization of SPD aka "XFRM rules" 59 ------------------------------------ 60 61 Basic objects: 62 - policy rule, struct xfrm_policy (=SPD entry) 63 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) 64 - instance of a transformer, struct xfrm_state (=SA) 65 - template to clone xfrm_state, struct xfrm_tmpl 66 67 SPD is plain linear list of xfrm_policy rules, ordered by priority. 68 (To be compatible with existing pfkeyv2 implementations, 69 many rules with priority of 0x7fffffff are allowed to exist and 70 such rules are ordered in an unpredictable way, thanks to bsd folks.) 71 72 Lookup is plain linear search until the first match with selector. 73 74 If "action" is "block", then we prohibit the flow, otherwise: 75 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, 76 policy entry has list of up to XFRM_MAX_DEPTH transformations, 77 described by templates xfrm_tmpl. Each template is resolved 78 to a complete xfrm_state (see below) and we pack bundle of transformations 79 to a dst_entry returned to requestor. 80 81 dst -. xfrm .-> xfrm_state #1 82 |---. child .-> dst -. xfrm .-> xfrm_state #2 83 |---. child .-> dst -. xfrm .-> xfrm_state #3 84 |---. child .-> NULL 85 86 Bundles are cached at xrfm_policy struct (field ->bundles). 87 88 89 Resolution of xrfm_tmpl 90 ----------------------- 91 Template contains: 92 1. ->mode Mode: transport or tunnel 93 2. ->id.proto Protocol: AH/ESP/IPCOMP 94 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. 95 Q: allow to resolve security gateway? 96 4. ->id.spi If not zero, static SPI. 97 5. ->saddr Local tunnel endpoint, ignored for transport mode. 98 6. ->algos List of allowed algos. Plain bitmask now. 99 Q: ealgos, aalgos, calgos. What a mess... 100 7. ->share Sharing mode. 101 Q: how to implement private sharing mode? To add struct sock* to 102 flow id? 103 104 Having this template we search through SAD searching for entries 105 with appropriate mode/proto/algo, permitted by selector. 106 If no appropriate entry found, it is requested from key manager. 107 108 PROBLEMS: 109 Q: How to find all the bundles referring to a physical path for 110 PMTU discovery? Seems, dst should contain list of all parents... 111 and enter to infinite locking hierarchy disaster. 112 No! It is easier, we will not search for them, let them find us. 113 We add genid to each dst plus pointer to genid of raw IP route, 114 pmtu disc will update pmtu on raw IP route and increase its genid. 115 dst_check() will see this for top level and trigger resyncing 116 metrics. Plus, it will be made via sk->sk_dst_cache. Solved. 117 */ 118 119 struct xfrm_state_walk { 120 struct list_head all; 121 u8 state; 122 union { 123 u8 dying; 124 u8 proto; 125 }; 126 u32 seq; 127 }; 128 129 /* Full description of state of transformer. */ 130 struct xfrm_state { 131 #ifdef CONFIG_NET_NS 132 struct net *xs_net; 133 #endif 134 union { 135 struct hlist_node gclist; 136 struct hlist_node bydst; 137 }; 138 struct hlist_node bysrc; 139 struct hlist_node byspi; 140 141 atomic_t refcnt; 142 spinlock_t lock; 143 144 struct xfrm_id id; 145 struct xfrm_selector sel; 146 struct xfrm_mark mark; 147 u32 tfcpad; 148 149 u32 genid; 150 151 /* Key manager bits */ 152 struct xfrm_state_walk km; 153 154 /* Parameters of this state. */ 155 struct { 156 u32 reqid; 157 u8 mode; 158 u8 replay_window; 159 u8 aalgo, ealgo, calgo; 160 u8 flags; 161 u16 family; 162 xfrm_address_t saddr; 163 int header_len; 164 int trailer_len; 165 } props; 166 167 struct xfrm_lifetime_cfg lft; 168 169 /* Data for transformer */ 170 struct xfrm_algo_auth *aalg; 171 struct xfrm_algo *ealg; 172 struct xfrm_algo *calg; 173 struct xfrm_algo_aead *aead; 174 175 /* Data for encapsulator */ 176 struct xfrm_encap_tmpl *encap; 177 178 /* Data for care-of address */ 179 xfrm_address_t *coaddr; 180 181 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 182 struct xfrm_state *tunnel; 183 184 /* If a tunnel, number of users + 1 */ 185 atomic_t tunnel_users; 186 187 /* State for replay detection */ 188 struct xfrm_replay_state replay; 189 struct xfrm_replay_state_esn *replay_esn; 190 191 /* Replay detection state at the time we sent the last notification */ 192 struct xfrm_replay_state preplay; 193 struct xfrm_replay_state_esn *preplay_esn; 194 195 /* The functions for replay detection. */ 196 struct xfrm_replay *repl; 197 198 /* internal flag that only holds state for delayed aevent at the 199 * moment 200 */ 201 u32 xflags; 202 203 /* Replay detection notification settings */ 204 u32 replay_maxage; 205 u32 replay_maxdiff; 206 207 /* Replay detection notification timer */ 208 struct timer_list rtimer; 209 210 /* Statistics */ 211 struct xfrm_stats stats; 212 213 struct xfrm_lifetime_cur curlft; 214 struct tasklet_hrtimer mtimer; 215 216 /* Last used time */ 217 unsigned long lastused; 218 219 /* Reference to data common to all the instances of this 220 * transformer. */ 221 const struct xfrm_type *type; 222 struct xfrm_mode *inner_mode; 223 struct xfrm_mode *inner_mode_iaf; 224 struct xfrm_mode *outer_mode; 225 226 /* Security context */ 227 struct xfrm_sec_ctx *security; 228 229 /* Private data of this transformer, format is opaque, 230 * interpreted by xfrm_type methods. */ 231 void *data; 232 }; 233 234 static inline struct net *xs_net(struct xfrm_state *x) 235 { 236 return read_pnet(&x->xs_net); 237 } 238 239 /* xflags - make enum if more show up */ 240 #define XFRM_TIME_DEFER 1 241 242 enum { 243 XFRM_STATE_VOID, 244 XFRM_STATE_ACQ, 245 XFRM_STATE_VALID, 246 XFRM_STATE_ERROR, 247 XFRM_STATE_EXPIRED, 248 XFRM_STATE_DEAD 249 }; 250 251 /* callback structure passed from either netlink or pfkey */ 252 struct km_event { 253 union { 254 u32 hard; 255 u32 proto; 256 u32 byid; 257 u32 aevent; 258 u32 type; 259 } data; 260 261 u32 seq; 262 u32 pid; 263 u32 event; 264 struct net *net; 265 }; 266 267 struct xfrm_replay { 268 void (*advance)(struct xfrm_state *x, __be32 net_seq); 269 int (*check)(struct xfrm_state *x, 270 struct sk_buff *skb, 271 __be32 net_seq); 272 void (*notify)(struct xfrm_state *x, int event); 273 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb); 274 }; 275 276 struct net_device; 277 struct xfrm_type; 278 struct xfrm_dst; 279 struct xfrm_policy_afinfo { 280 unsigned short family; 281 struct dst_ops *dst_ops; 282 void (*garbage_collect)(struct net *net); 283 struct dst_entry *(*dst_lookup)(struct net *net, int tos, 284 const xfrm_address_t *saddr, 285 const xfrm_address_t *daddr); 286 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr); 287 void (*decode_session)(struct sk_buff *skb, 288 struct flowi *fl, 289 int reverse); 290 int (*get_tos)(const struct flowi *fl); 291 int (*init_path)(struct xfrm_dst *path, 292 struct dst_entry *dst, 293 int nfheader_len); 294 int (*fill_dst)(struct xfrm_dst *xdst, 295 struct net_device *dev, 296 const struct flowi *fl); 297 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig); 298 }; 299 300 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); 301 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); 302 extern void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c); 303 extern void km_state_notify(struct xfrm_state *x, const struct km_event *c); 304 305 struct xfrm_tmpl; 306 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); 307 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid); 308 extern int __xfrm_state_delete(struct xfrm_state *x); 309 310 struct xfrm_state_afinfo { 311 unsigned int family; 312 unsigned int proto; 313 __be16 eth_proto; 314 struct module *owner; 315 const struct xfrm_type *type_map[IPPROTO_MAX]; 316 struct xfrm_mode *mode_map[XFRM_MODE_MAX]; 317 int (*init_flags)(struct xfrm_state *x); 318 void (*init_tempsel)(struct xfrm_selector *sel, 319 const struct flowi *fl); 320 void (*init_temprop)(struct xfrm_state *x, 321 const struct xfrm_tmpl *tmpl, 322 const xfrm_address_t *daddr, 323 const xfrm_address_t *saddr); 324 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n); 325 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n); 326 int (*output)(struct sk_buff *skb); 327 int (*extract_input)(struct xfrm_state *x, 328 struct sk_buff *skb); 329 int (*extract_output)(struct xfrm_state *x, 330 struct sk_buff *skb); 331 int (*transport_finish)(struct sk_buff *skb, 332 int async); 333 }; 334 335 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 336 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 337 338 extern void xfrm_state_delete_tunnel(struct xfrm_state *x); 339 340 struct xfrm_type { 341 char *description; 342 struct module *owner; 343 u8 proto; 344 u8 flags; 345 #define XFRM_TYPE_NON_FRAGMENT 1 346 #define XFRM_TYPE_REPLAY_PROT 2 347 #define XFRM_TYPE_LOCAL_COADDR 4 348 #define XFRM_TYPE_REMOTE_COADDR 8 349 350 int (*init_state)(struct xfrm_state *x); 351 void (*destructor)(struct xfrm_state *); 352 int (*input)(struct xfrm_state *, struct sk_buff *skb); 353 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 354 int (*reject)(struct xfrm_state *, struct sk_buff *, 355 const struct flowi *); 356 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **); 357 /* Estimate maximal size of result of transformation of a dgram */ 358 u32 (*get_mtu)(struct xfrm_state *, int size); 359 }; 360 361 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family); 362 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); 363 364 struct xfrm_mode { 365 /* 366 * Remove encapsulation header. 367 * 368 * The IP header will be moved over the top of the encapsulation 369 * header. 370 * 371 * On entry, the transport header shall point to where the IP header 372 * should be and the network header shall be set to where the IP 373 * header currently is. skb->data shall point to the start of the 374 * payload. 375 */ 376 int (*input2)(struct xfrm_state *x, struct sk_buff *skb); 377 378 /* 379 * This is the actual input entry point. 380 * 381 * For transport mode and equivalent this would be identical to 382 * input2 (which does not need to be set). While tunnel mode 383 * and equivalent would set this to the tunnel encapsulation function 384 * xfrm4_prepare_input that would in turn call input2. 385 */ 386 int (*input)(struct xfrm_state *x, struct sk_buff *skb); 387 388 /* 389 * Add encapsulation header. 390 * 391 * On exit, the transport header will be set to the start of the 392 * encapsulation header to be filled in by x->type->output and 393 * the mac header will be set to the nextheader (protocol for 394 * IPv4) field of the extension header directly preceding the 395 * encapsulation header, or in its absence, that of the top IP 396 * header. The value of the network header will always point 397 * to the top IP header while skb->data will point to the payload. 398 */ 399 int (*output2)(struct xfrm_state *x,struct sk_buff *skb); 400 401 /* 402 * This is the actual output entry point. 403 * 404 * For transport mode and equivalent this would be identical to 405 * output2 (which does not need to be set). While tunnel mode 406 * and equivalent would set this to a tunnel encapsulation function 407 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn 408 * call output2. 409 */ 410 int (*output)(struct xfrm_state *x, struct sk_buff *skb); 411 412 struct xfrm_state_afinfo *afinfo; 413 struct module *owner; 414 unsigned int encap; 415 int flags; 416 }; 417 418 /* Flags for xfrm_mode. */ 419 enum { 420 XFRM_MODE_FLAG_TUNNEL = 1, 421 }; 422 423 extern int xfrm_register_mode(struct xfrm_mode *mode, int family); 424 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family); 425 426 static inline int xfrm_af2proto(unsigned int family) 427 { 428 switch(family) { 429 case AF_INET: 430 return IPPROTO_IPIP; 431 case AF_INET6: 432 return IPPROTO_IPV6; 433 default: 434 return 0; 435 } 436 } 437 438 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto) 439 { 440 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) || 441 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6)) 442 return x->inner_mode; 443 else 444 return x->inner_mode_iaf; 445 } 446 447 struct xfrm_tmpl { 448 /* id in template is interpreted as: 449 * daddr - destination of tunnel, may be zero for transport mode. 450 * spi - zero to acquire spi. Not zero if spi is static, then 451 * daddr must be fixed too. 452 * proto - AH/ESP/IPCOMP 453 */ 454 struct xfrm_id id; 455 456 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 457 xfrm_address_t saddr; 458 459 unsigned short encap_family; 460 461 u32 reqid; 462 463 /* Mode: transport, tunnel etc. */ 464 u8 mode; 465 466 /* Sharing mode: unique, this session only, this user only etc. */ 467 u8 share; 468 469 /* May skip this transfomration if no SA is found */ 470 u8 optional; 471 472 /* Skip aalgos/ealgos/calgos checks. */ 473 u8 allalgs; 474 475 /* Bit mask of algos allowed for acquisition */ 476 u32 aalgos; 477 u32 ealgos; 478 u32 calgos; 479 }; 480 481 #define XFRM_MAX_DEPTH 6 482 483 struct xfrm_policy_walk_entry { 484 struct list_head all; 485 u8 dead; 486 }; 487 488 struct xfrm_policy_walk { 489 struct xfrm_policy_walk_entry walk; 490 u8 type; 491 u32 seq; 492 }; 493 494 struct xfrm_policy { 495 #ifdef CONFIG_NET_NS 496 struct net *xp_net; 497 #endif 498 struct hlist_node bydst; 499 struct hlist_node byidx; 500 501 /* This lock only affects elements except for entry. */ 502 rwlock_t lock; 503 atomic_t refcnt; 504 struct timer_list timer; 505 506 struct flow_cache_object flo; 507 atomic_t genid; 508 u32 priority; 509 u32 index; 510 struct xfrm_mark mark; 511 struct xfrm_selector selector; 512 struct xfrm_lifetime_cfg lft; 513 struct xfrm_lifetime_cur curlft; 514 struct xfrm_policy_walk_entry walk; 515 u8 type; 516 u8 action; 517 u8 flags; 518 u8 xfrm_nr; 519 u16 family; 520 struct xfrm_sec_ctx *security; 521 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 522 }; 523 524 static inline struct net *xp_net(const struct xfrm_policy *xp) 525 { 526 return read_pnet(&xp->xp_net); 527 } 528 529 struct xfrm_kmaddress { 530 xfrm_address_t local; 531 xfrm_address_t remote; 532 u32 reserved; 533 u16 family; 534 }; 535 536 struct xfrm_migrate { 537 xfrm_address_t old_daddr; 538 xfrm_address_t old_saddr; 539 xfrm_address_t new_daddr; 540 xfrm_address_t new_saddr; 541 u8 proto; 542 u8 mode; 543 u16 reserved; 544 u32 reqid; 545 u16 old_family; 546 u16 new_family; 547 }; 548 549 #define XFRM_KM_TIMEOUT 30 550 /* which seqno */ 551 #define XFRM_REPLAY_SEQ 1 552 #define XFRM_REPLAY_OSEQ 2 553 #define XFRM_REPLAY_SEQ_MASK 3 554 /* what happened */ 555 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 556 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 557 558 /* default aevent timeout in units of 100ms */ 559 #define XFRM_AE_ETIME 10 560 /* Async Event timer multiplier */ 561 #define XFRM_AE_ETH_M 10 562 /* default seq threshold size */ 563 #define XFRM_AE_SEQT_SIZE 2 564 565 struct xfrm_mgr { 566 struct list_head list; 567 char *id; 568 int (*notify)(struct xfrm_state *x, const struct km_event *c); 569 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); 570 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 571 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 572 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c); 573 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 574 int (*migrate)(const struct xfrm_selector *sel, 575 u8 dir, u8 type, 576 const struct xfrm_migrate *m, 577 int num_bundles, 578 const struct xfrm_kmaddress *k); 579 }; 580 581 extern int xfrm_register_km(struct xfrm_mgr *km); 582 extern int xfrm_unregister_km(struct xfrm_mgr *km); 583 584 /* 585 * This structure is used for the duration where packets are being 586 * transformed by IPsec. As soon as the packet leaves IPsec the 587 * area beyond the generic IP part may be overwritten. 588 */ 589 struct xfrm_skb_cb { 590 union { 591 struct inet_skb_parm h4; 592 struct inet6_skb_parm h6; 593 } header; 594 595 /* Sequence number for replay protection. */ 596 union { 597 struct { 598 __u32 low; 599 __u32 hi; 600 } output; 601 struct { 602 __be32 low; 603 __be32 hi; 604 } input; 605 } seq; 606 }; 607 608 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) 609 610 /* 611 * This structure is used by the afinfo prepare_input/prepare_output functions 612 * to transmit header information to the mode input/output functions. 613 */ 614 struct xfrm_mode_skb_cb { 615 union { 616 struct inet_skb_parm h4; 617 struct inet6_skb_parm h6; 618 } header; 619 620 /* Copied from header for IPv4, always set to zero and DF for IPv6. */ 621 __be16 id; 622 __be16 frag_off; 623 624 /* IP header length (excluding options or extension headers). */ 625 u8 ihl; 626 627 /* TOS for IPv4, class for IPv6. */ 628 u8 tos; 629 630 /* TTL for IPv4, hop limitfor IPv6. */ 631 u8 ttl; 632 633 /* Protocol for IPv4, NH for IPv6. */ 634 u8 protocol; 635 636 /* Option length for IPv4, zero for IPv6. */ 637 u8 optlen; 638 639 /* Used by IPv6 only, zero for IPv4. */ 640 u8 flow_lbl[3]; 641 }; 642 643 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0])) 644 645 /* 646 * This structure is used by the input processing to locate the SPI and 647 * related information. 648 */ 649 struct xfrm_spi_skb_cb { 650 union { 651 struct inet_skb_parm h4; 652 struct inet6_skb_parm h6; 653 } header; 654 655 unsigned int daddroff; 656 unsigned int family; 657 }; 658 659 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0])) 660 661 /* Audit Information */ 662 struct xfrm_audit { 663 u32 secid; 664 uid_t loginuid; 665 u32 sessionid; 666 }; 667 668 #ifdef CONFIG_AUDITSYSCALL 669 static inline struct audit_buffer *xfrm_audit_start(const char *op) 670 { 671 struct audit_buffer *audit_buf = NULL; 672 673 if (audit_enabled == 0) 674 return NULL; 675 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, 676 AUDIT_MAC_IPSEC_EVENT); 677 if (audit_buf == NULL) 678 return NULL; 679 audit_log_format(audit_buf, "op=%s", op); 680 return audit_buf; 681 } 682 683 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid, 684 struct audit_buffer *audit_buf) 685 { 686 char *secctx; 687 u32 secctx_len; 688 689 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses); 690 if (secid != 0 && 691 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) { 692 audit_log_format(audit_buf, " subj=%s", secctx); 693 security_release_secctx(secctx, secctx_len); 694 } else 695 audit_log_task_context(audit_buf); 696 } 697 698 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 699 u32 auid, u32 ses, u32 secid); 700 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 701 u32 auid, u32 ses, u32 secid); 702 extern void xfrm_audit_state_add(struct xfrm_state *x, int result, 703 u32 auid, u32 ses, u32 secid); 704 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result, 705 u32 auid, u32 ses, u32 secid); 706 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 707 struct sk_buff *skb); 708 extern void xfrm_audit_state_replay(struct xfrm_state *x, 709 struct sk_buff *skb, __be32 net_seq); 710 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family); 711 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 712 __be32 net_spi, __be32 net_seq); 713 extern void xfrm_audit_state_icvfail(struct xfrm_state *x, 714 struct sk_buff *skb, u8 proto); 715 #else 716 717 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 718 u32 auid, u32 ses, u32 secid) 719 { 720 } 721 722 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 723 u32 auid, u32 ses, u32 secid) 724 { 725 } 726 727 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result, 728 u32 auid, u32 ses, u32 secid) 729 { 730 } 731 732 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result, 733 u32 auid, u32 ses, u32 secid) 734 { 735 } 736 737 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 738 struct sk_buff *skb) 739 { 740 } 741 742 static inline void xfrm_audit_state_replay(struct xfrm_state *x, 743 struct sk_buff *skb, __be32 net_seq) 744 { 745 } 746 747 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb, 748 u16 family) 749 { 750 } 751 752 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 753 __be32 net_spi, __be32 net_seq) 754 { 755 } 756 757 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x, 758 struct sk_buff *skb, u8 proto) 759 { 760 } 761 #endif /* CONFIG_AUDITSYSCALL */ 762 763 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 764 { 765 if (likely(policy != NULL)) 766 atomic_inc(&policy->refcnt); 767 } 768 769 extern void xfrm_policy_destroy(struct xfrm_policy *policy); 770 771 static inline void xfrm_pol_put(struct xfrm_policy *policy) 772 { 773 if (atomic_dec_and_test(&policy->refcnt)) 774 xfrm_policy_destroy(policy); 775 } 776 777 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 778 { 779 int i; 780 for (i = npols - 1; i >= 0; --i) 781 xfrm_pol_put(pols[i]); 782 } 783 784 extern void __xfrm_state_destroy(struct xfrm_state *); 785 786 static inline void __xfrm_state_put(struct xfrm_state *x) 787 { 788 atomic_dec(&x->refcnt); 789 } 790 791 static inline void xfrm_state_put(struct xfrm_state *x) 792 { 793 if (atomic_dec_and_test(&x->refcnt)) 794 __xfrm_state_destroy(x); 795 } 796 797 static inline void xfrm_state_hold(struct xfrm_state *x) 798 { 799 atomic_inc(&x->refcnt); 800 } 801 802 static inline bool addr_match(const void *token1, const void *token2, 803 int prefixlen) 804 { 805 const __be32 *a1 = token1; 806 const __be32 *a2 = token2; 807 int pdw; 808 int pbi; 809 810 pdw = prefixlen >> 5; /* num of whole u32 in prefix */ 811 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 812 813 if (pdw) 814 if (memcmp(a1, a2, pdw << 2)) 815 return false; 816 817 if (pbi) { 818 __be32 mask; 819 820 mask = htonl((0xffffffff) << (32 - pbi)); 821 822 if ((a1[pdw] ^ a2[pdw]) & mask) 823 return false; 824 } 825 826 return true; 827 } 828 829 static __inline__ 830 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli) 831 { 832 __be16 port; 833 switch(fl->flowi_proto) { 834 case IPPROTO_TCP: 835 case IPPROTO_UDP: 836 case IPPROTO_UDPLITE: 837 case IPPROTO_SCTP: 838 port = uli->ports.sport; 839 break; 840 case IPPROTO_ICMP: 841 case IPPROTO_ICMPV6: 842 port = htons(uli->icmpt.type); 843 break; 844 case IPPROTO_MH: 845 port = htons(uli->mht.type); 846 break; 847 case IPPROTO_GRE: 848 port = htons(ntohl(uli->gre_key) >> 16); 849 break; 850 default: 851 port = 0; /*XXX*/ 852 } 853 return port; 854 } 855 856 static __inline__ 857 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli) 858 { 859 __be16 port; 860 switch(fl->flowi_proto) { 861 case IPPROTO_TCP: 862 case IPPROTO_UDP: 863 case IPPROTO_UDPLITE: 864 case IPPROTO_SCTP: 865 port = uli->ports.dport; 866 break; 867 case IPPROTO_ICMP: 868 case IPPROTO_ICMPV6: 869 port = htons(uli->icmpt.code); 870 break; 871 case IPPROTO_GRE: 872 port = htons(ntohl(uli->gre_key) & 0xffff); 873 break; 874 default: 875 port = 0; /*XXX*/ 876 } 877 return port; 878 } 879 880 extern int xfrm_selector_match(const struct xfrm_selector *sel, 881 const struct flowi *fl, 882 unsigned short family); 883 884 #ifdef CONFIG_SECURITY_NETWORK_XFRM 885 /* If neither has a context --> match 886 * Otherwise, both must have a context and the sids, doi, alg must match 887 */ 888 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 889 { 890 return ((!s1 && !s2) || 891 (s1 && s2 && 892 (s1->ctx_sid == s2->ctx_sid) && 893 (s1->ctx_doi == s2->ctx_doi) && 894 (s1->ctx_alg == s2->ctx_alg))); 895 } 896 #else 897 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 898 { 899 return 1; 900 } 901 #endif 902 903 /* A struct encoding bundle of transformations to apply to some set of flow. 904 * 905 * dst->child points to the next element of bundle. 906 * dst->xfrm points to an instanse of transformer. 907 * 908 * Due to unfortunate limitations of current routing cache, which we 909 * have no time to fix, it mirrors struct rtable and bound to the same 910 * routing key, including saddr,daddr. However, we can have many of 911 * bundles differing by session id. All the bundles grow from a parent 912 * policy rule. 913 */ 914 struct xfrm_dst { 915 union { 916 struct dst_entry dst; 917 struct rtable rt; 918 struct rt6_info rt6; 919 } u; 920 struct dst_entry *route; 921 struct flow_cache_object flo; 922 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; 923 int num_pols, num_xfrms; 924 #ifdef CONFIG_XFRM_SUB_POLICY 925 struct flowi *origin; 926 struct xfrm_selector *partner; 927 #endif 928 u32 xfrm_genid; 929 u32 policy_genid; 930 u32 route_mtu_cached; 931 u32 child_mtu_cached; 932 u32 route_cookie; 933 u32 path_cookie; 934 }; 935 936 #ifdef CONFIG_XFRM 937 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 938 { 939 xfrm_pols_put(xdst->pols, xdst->num_pols); 940 dst_release(xdst->route); 941 if (likely(xdst->u.dst.xfrm)) 942 xfrm_state_put(xdst->u.dst.xfrm); 943 #ifdef CONFIG_XFRM_SUB_POLICY 944 kfree(xdst->origin); 945 xdst->origin = NULL; 946 kfree(xdst->partner); 947 xdst->partner = NULL; 948 #endif 949 } 950 #endif 951 952 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 953 954 struct sec_path { 955 atomic_t refcnt; 956 int len; 957 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 958 }; 959 960 static inline struct sec_path * 961 secpath_get(struct sec_path *sp) 962 { 963 if (sp) 964 atomic_inc(&sp->refcnt); 965 return sp; 966 } 967 968 extern void __secpath_destroy(struct sec_path *sp); 969 970 static inline void 971 secpath_put(struct sec_path *sp) 972 { 973 if (sp && atomic_dec_and_test(&sp->refcnt)) 974 __secpath_destroy(sp); 975 } 976 977 extern struct sec_path *secpath_dup(struct sec_path *src); 978 979 static inline void 980 secpath_reset(struct sk_buff *skb) 981 { 982 #ifdef CONFIG_XFRM 983 secpath_put(skb->sp); 984 skb->sp = NULL; 985 #endif 986 } 987 988 static inline int 989 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family) 990 { 991 switch (family) { 992 case AF_INET: 993 return addr->a4 == 0; 994 case AF_INET6: 995 return ipv6_addr_any((struct in6_addr *)&addr->a6); 996 } 997 return 0; 998 } 999 1000 static inline int 1001 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1002 { 1003 return (tmpl->saddr.a4 && 1004 tmpl->saddr.a4 != x->props.saddr.a4); 1005 } 1006 1007 static inline int 1008 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1009 { 1010 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 1011 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 1012 } 1013 1014 static inline int 1015 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family) 1016 { 1017 switch (family) { 1018 case AF_INET: 1019 return __xfrm4_state_addr_cmp(tmpl, x); 1020 case AF_INET6: 1021 return __xfrm6_state_addr_cmp(tmpl, x); 1022 } 1023 return !0; 1024 } 1025 1026 #ifdef CONFIG_XFRM 1027 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); 1028 1029 static inline int __xfrm_policy_check2(struct sock *sk, int dir, 1030 struct sk_buff *skb, 1031 unsigned int family, int reverse) 1032 { 1033 struct net *net = dev_net(skb->dev); 1034 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); 1035 1036 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 1037 return __xfrm_policy_check(sk, ndir, skb, family); 1038 1039 return (!net->xfrm.policy_count[dir] && !skb->sp) || 1040 (skb_dst(skb)->flags & DST_NOPOLICY) || 1041 __xfrm_policy_check(sk, ndir, skb, family); 1042 } 1043 1044 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1045 { 1046 return __xfrm_policy_check2(sk, dir, skb, family, 0); 1047 } 1048 1049 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1050 { 1051 return xfrm_policy_check(sk, dir, skb, AF_INET); 1052 } 1053 1054 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1055 { 1056 return xfrm_policy_check(sk, dir, skb, AF_INET6); 1057 } 1058 1059 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1060 struct sk_buff *skb) 1061 { 1062 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); 1063 } 1064 1065 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1066 struct sk_buff *skb) 1067 { 1068 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); 1069 } 1070 1071 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1072 unsigned int family, int reverse); 1073 1074 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1075 unsigned int family) 1076 { 1077 return __xfrm_decode_session(skb, fl, family, 0); 1078 } 1079 1080 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1081 struct flowi *fl, 1082 unsigned int family) 1083 { 1084 return __xfrm_decode_session(skb, fl, family, 1); 1085 } 1086 1087 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 1088 1089 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 1090 { 1091 struct net *net = dev_net(skb->dev); 1092 1093 return !net->xfrm.policy_count[XFRM_POLICY_OUT] || 1094 (skb_dst(skb)->flags & DST_NOXFRM) || 1095 __xfrm_route_forward(skb, family); 1096 } 1097 1098 static inline int xfrm4_route_forward(struct sk_buff *skb) 1099 { 1100 return xfrm_route_forward(skb, AF_INET); 1101 } 1102 1103 static inline int xfrm6_route_forward(struct sk_buff *skb) 1104 { 1105 return xfrm_route_forward(skb, AF_INET6); 1106 } 1107 1108 extern int __xfrm_sk_clone_policy(struct sock *sk); 1109 1110 static inline int xfrm_sk_clone_policy(struct sock *sk) 1111 { 1112 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) 1113 return __xfrm_sk_clone_policy(sk); 1114 return 0; 1115 } 1116 1117 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 1118 1119 static inline void xfrm_sk_free_policy(struct sock *sk) 1120 { 1121 if (unlikely(sk->sk_policy[0] != NULL)) { 1122 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); 1123 sk->sk_policy[0] = NULL; 1124 } 1125 if (unlikely(sk->sk_policy[1] != NULL)) { 1126 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); 1127 sk->sk_policy[1] = NULL; 1128 } 1129 } 1130 1131 #else 1132 1133 static inline void xfrm_sk_free_policy(struct sock *sk) {} 1134 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } 1135 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 1136 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 1137 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1138 { 1139 return 1; 1140 } 1141 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1142 { 1143 return 1; 1144 } 1145 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1146 { 1147 return 1; 1148 } 1149 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1150 struct flowi *fl, 1151 unsigned int family) 1152 { 1153 return -ENOSYS; 1154 } 1155 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1156 struct sk_buff *skb) 1157 { 1158 return 1; 1159 } 1160 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1161 struct sk_buff *skb) 1162 { 1163 return 1; 1164 } 1165 #endif 1166 1167 static __inline__ 1168 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family) 1169 { 1170 switch (family){ 1171 case AF_INET: 1172 return (xfrm_address_t *)&fl->u.ip4.daddr; 1173 case AF_INET6: 1174 return (xfrm_address_t *)&fl->u.ip6.daddr; 1175 } 1176 return NULL; 1177 } 1178 1179 static __inline__ 1180 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family) 1181 { 1182 switch (family){ 1183 case AF_INET: 1184 return (xfrm_address_t *)&fl->u.ip4.saddr; 1185 case AF_INET6: 1186 return (xfrm_address_t *)&fl->u.ip6.saddr; 1187 } 1188 return NULL; 1189 } 1190 1191 static __inline__ 1192 void xfrm_flowi_addr_get(const struct flowi *fl, 1193 xfrm_address_t *saddr, xfrm_address_t *daddr, 1194 unsigned short family) 1195 { 1196 switch(family) { 1197 case AF_INET: 1198 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4)); 1199 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4)); 1200 break; 1201 case AF_INET6: 1202 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->u.ip6.saddr); 1203 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->u.ip6.daddr); 1204 break; 1205 } 1206 } 1207 1208 static __inline__ int 1209 __xfrm4_state_addr_check(const struct xfrm_state *x, 1210 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1211 { 1212 if (daddr->a4 == x->id.daddr.a4 && 1213 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 1214 return 1; 1215 return 0; 1216 } 1217 1218 static __inline__ int 1219 __xfrm6_state_addr_check(const struct xfrm_state *x, 1220 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1221 { 1222 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 1223 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| 1224 ipv6_addr_any((struct in6_addr *)saddr) || 1225 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 1226 return 1; 1227 return 0; 1228 } 1229 1230 static __inline__ int 1231 xfrm_state_addr_check(const struct xfrm_state *x, 1232 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1233 unsigned short family) 1234 { 1235 switch (family) { 1236 case AF_INET: 1237 return __xfrm4_state_addr_check(x, daddr, saddr); 1238 case AF_INET6: 1239 return __xfrm6_state_addr_check(x, daddr, saddr); 1240 } 1241 return 0; 1242 } 1243 1244 static __inline__ int 1245 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl, 1246 unsigned short family) 1247 { 1248 switch (family) { 1249 case AF_INET: 1250 return __xfrm4_state_addr_check(x, 1251 (const xfrm_address_t *)&fl->u.ip4.daddr, 1252 (const xfrm_address_t *)&fl->u.ip4.saddr); 1253 case AF_INET6: 1254 return __xfrm6_state_addr_check(x, 1255 (const xfrm_address_t *)&fl->u.ip6.daddr, 1256 (const xfrm_address_t *)&fl->u.ip6.saddr); 1257 } 1258 return 0; 1259 } 1260 1261 static inline int xfrm_state_kern(const struct xfrm_state *x) 1262 { 1263 return atomic_read(&x->tunnel_users); 1264 } 1265 1266 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 1267 { 1268 return (!userproto || proto == userproto || 1269 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 1270 proto == IPPROTO_ESP || 1271 proto == IPPROTO_COMP))); 1272 } 1273 1274 /* 1275 * xfrm algorithm information 1276 */ 1277 struct xfrm_algo_aead_info { 1278 u16 icv_truncbits; 1279 }; 1280 1281 struct xfrm_algo_auth_info { 1282 u16 icv_truncbits; 1283 u16 icv_fullbits; 1284 }; 1285 1286 struct xfrm_algo_encr_info { 1287 u16 blockbits; 1288 u16 defkeybits; 1289 }; 1290 1291 struct xfrm_algo_comp_info { 1292 u16 threshold; 1293 }; 1294 1295 struct xfrm_algo_desc { 1296 char *name; 1297 char *compat; 1298 u8 available:1; 1299 union { 1300 struct xfrm_algo_aead_info aead; 1301 struct xfrm_algo_auth_info auth; 1302 struct xfrm_algo_encr_info encr; 1303 struct xfrm_algo_comp_info comp; 1304 } uinfo; 1305 struct sadb_alg desc; 1306 }; 1307 1308 /* XFRM tunnel handlers. */ 1309 struct xfrm_tunnel { 1310 int (*handler)(struct sk_buff *skb); 1311 int (*err_handler)(struct sk_buff *skb, u32 info); 1312 1313 struct xfrm_tunnel __rcu *next; 1314 int priority; 1315 }; 1316 1317 struct xfrm6_tunnel { 1318 int (*handler)(struct sk_buff *skb); 1319 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1320 u8 type, u8 code, int offset, __be32 info); 1321 struct xfrm6_tunnel __rcu *next; 1322 int priority; 1323 }; 1324 1325 extern void xfrm_init(void); 1326 extern void xfrm4_init(int rt_hash_size); 1327 extern int xfrm_state_init(struct net *net); 1328 extern void xfrm_state_fini(struct net *net); 1329 extern void xfrm4_state_init(void); 1330 #ifdef CONFIG_XFRM 1331 extern int xfrm6_init(void); 1332 extern void xfrm6_fini(void); 1333 extern int xfrm6_state_init(void); 1334 extern void xfrm6_state_fini(void); 1335 #else 1336 static inline int xfrm6_init(void) 1337 { 1338 return 0; 1339 } 1340 static inline void xfrm6_fini(void) 1341 { 1342 ; 1343 } 1344 #endif 1345 1346 #ifdef CONFIG_XFRM_STATISTICS 1347 extern int xfrm_proc_init(struct net *net); 1348 extern void xfrm_proc_fini(struct net *net); 1349 #endif 1350 1351 extern int xfrm_sysctl_init(struct net *net); 1352 #ifdef CONFIG_SYSCTL 1353 extern void xfrm_sysctl_fini(struct net *net); 1354 #else 1355 static inline void xfrm_sysctl_fini(struct net *net) 1356 { 1357 } 1358 #endif 1359 1360 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto); 1361 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1362 int (*func)(struct xfrm_state *, int, void*), void *); 1363 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk); 1364 extern struct xfrm_state *xfrm_state_alloc(struct net *net); 1365 extern struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr, 1366 const xfrm_address_t *saddr, 1367 const struct flowi *fl, 1368 struct xfrm_tmpl *tmpl, 1369 struct xfrm_policy *pol, int *err, 1370 unsigned short family); 1371 extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, 1372 xfrm_address_t *daddr, 1373 xfrm_address_t *saddr, 1374 unsigned short family, 1375 u8 mode, u8 proto, u32 reqid); 1376 extern int xfrm_state_check_expire(struct xfrm_state *x); 1377 extern void xfrm_state_insert(struct xfrm_state *x); 1378 extern int xfrm_state_add(struct xfrm_state *x); 1379 extern int xfrm_state_update(struct xfrm_state *x); 1380 extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark, 1381 const xfrm_address_t *daddr, __be32 spi, 1382 u8 proto, unsigned short family); 1383 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1384 const xfrm_address_t *daddr, 1385 const xfrm_address_t *saddr, 1386 u8 proto, 1387 unsigned short family); 1388 #ifdef CONFIG_XFRM_SUB_POLICY 1389 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 1390 int n, unsigned short family); 1391 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 1392 int n, unsigned short family); 1393 #else 1394 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 1395 int n, unsigned short family) 1396 { 1397 return -ENOSYS; 1398 } 1399 1400 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 1401 int n, unsigned short family) 1402 { 1403 return -ENOSYS; 1404 } 1405 #endif 1406 1407 struct xfrmk_sadinfo { 1408 u32 sadhcnt; /* current hash bkts */ 1409 u32 sadhmcnt; /* max allowed hash bkts */ 1410 u32 sadcnt; /* current running count */ 1411 }; 1412 1413 struct xfrmk_spdinfo { 1414 u32 incnt; 1415 u32 outcnt; 1416 u32 fwdcnt; 1417 u32 inscnt; 1418 u32 outscnt; 1419 u32 fwdscnt; 1420 u32 spdhcnt; 1421 u32 spdhmcnt; 1422 }; 1423 1424 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, 1425 u32 seq); 1426 extern int xfrm_state_delete(struct xfrm_state *x); 1427 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info); 1428 extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); 1429 extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); 1430 extern u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq); 1431 extern int xfrm_init_replay(struct xfrm_state *x); 1432 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); 1433 extern int xfrm_init_state(struct xfrm_state *x); 1434 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb); 1435 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, 1436 int encap_type); 1437 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr); 1438 extern int xfrm_output_resume(struct sk_buff *skb, int err); 1439 extern int xfrm_output(struct sk_buff *skb); 1440 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1441 extern int xfrm4_extract_header(struct sk_buff *skb); 1442 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1443 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1444 int encap_type); 1445 extern int xfrm4_transport_finish(struct sk_buff *skb, int async); 1446 extern int xfrm4_rcv(struct sk_buff *skb); 1447 1448 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1449 { 1450 return xfrm4_rcv_encap(skb, nexthdr, spi, 0); 1451 } 1452 1453 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1454 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb); 1455 extern int xfrm4_output(struct sk_buff *skb); 1456 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1457 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1458 extern int xfrm6_extract_header(struct sk_buff *skb); 1459 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1460 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi); 1461 extern int xfrm6_transport_finish(struct sk_buff *skb, int async); 1462 extern int xfrm6_rcv(struct sk_buff *skb); 1463 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1464 xfrm_address_t *saddr, u8 proto); 1465 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1466 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1467 extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr); 1468 extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, xfrm_address_t *saddr); 1469 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1470 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb); 1471 extern int xfrm6_output(struct sk_buff *skb); 1472 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, 1473 u8 **prevhdr); 1474 1475 #ifdef CONFIG_XFRM 1476 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1477 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); 1478 #else 1479 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 1480 { 1481 return -ENOPROTOOPT; 1482 } 1483 1484 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb) 1485 { 1486 /* should not happen */ 1487 kfree_skb(skb); 1488 return 0; 1489 } 1490 #endif 1491 1492 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); 1493 1494 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); 1495 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, 1496 int (*func)(struct xfrm_policy *, int, int, void*), void *); 1497 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk); 1498 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1499 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, 1500 u8 type, int dir, 1501 struct xfrm_selector *sel, 1502 struct xfrm_sec_ctx *ctx, int delete, 1503 int *err); 1504 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err); 1505 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info); 1506 u32 xfrm_get_acqseq(void); 1507 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 1508 struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark, 1509 u8 mode, u32 reqid, u8 proto, 1510 const xfrm_address_t *daddr, 1511 const xfrm_address_t *saddr, int create, 1512 unsigned short family); 1513 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1514 1515 #ifdef CONFIG_XFRM_MIGRATE 1516 extern int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1517 const struct xfrm_migrate *m, int num_bundles, 1518 const struct xfrm_kmaddress *k); 1519 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m); 1520 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, 1521 struct xfrm_migrate *m); 1522 extern int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1523 struct xfrm_migrate *m, int num_bundles, 1524 struct xfrm_kmaddress *k); 1525 #endif 1526 1527 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1528 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid); 1529 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 1530 1531 extern void xfrm_input_init(void); 1532 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1533 1534 extern void xfrm_probe_algs(void); 1535 extern int xfrm_count_auth_supported(void); 1536 extern int xfrm_count_enc_supported(void); 1537 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1538 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1539 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1540 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1541 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1542 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe); 1543 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe); 1544 extern struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe); 1545 extern struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, 1546 int probe); 1547 1548 struct hash_desc; 1549 struct scatterlist; 1550 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *, 1551 unsigned int); 1552 1553 static inline int xfrm_addr_cmp(const xfrm_address_t *a, 1554 const xfrm_address_t *b, 1555 int family) 1556 { 1557 switch (family) { 1558 default: 1559 case AF_INET: 1560 return (__force u32)a->a4 - (__force u32)b->a4; 1561 case AF_INET6: 1562 return ipv6_addr_cmp((struct in6_addr *)a, 1563 (struct in6_addr *)b); 1564 } 1565 } 1566 1567 static inline int xfrm_policy_id2dir(u32 index) 1568 { 1569 return index & 7; 1570 } 1571 1572 #ifdef CONFIG_XFRM 1573 static inline int xfrm_aevent_is_on(struct net *net) 1574 { 1575 struct sock *nlsk; 1576 int ret = 0; 1577 1578 rcu_read_lock(); 1579 nlsk = rcu_dereference(net->xfrm.nlsk); 1580 if (nlsk) 1581 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1582 rcu_read_unlock(); 1583 return ret; 1584 } 1585 #endif 1586 1587 static inline int xfrm_alg_len(const struct xfrm_algo *alg) 1588 { 1589 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1590 } 1591 1592 static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg) 1593 { 1594 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1595 } 1596 1597 static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn) 1598 { 1599 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32); 1600 } 1601 1602 #ifdef CONFIG_XFRM_MIGRATE 1603 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1604 { 1605 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); 1606 } 1607 1608 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig) 1609 { 1610 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL); 1611 } 1612 1613 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1614 { 1615 int i; 1616 for (i = 0; i < n; i++) 1617 xfrm_state_put(*(states + i)); 1618 } 1619 1620 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1621 { 1622 int i; 1623 for (i = 0; i < n; i++) 1624 xfrm_state_delete(*(states + i)); 1625 } 1626 #endif 1627 1628 #ifdef CONFIG_XFRM 1629 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) 1630 { 1631 return skb->sp->xvec[skb->sp->len - 1]; 1632 } 1633 #endif 1634 1635 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) 1636 { 1637 if (attrs[XFRMA_MARK]) 1638 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark)); 1639 else 1640 m->v = m->m = 0; 1641 1642 return m->v & m->m; 1643 } 1644 1645 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m) 1646 { 1647 if (m->m | m->v) 1648 NLA_PUT(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); 1649 return 0; 1650 1651 nla_put_failure: 1652 return -1; 1653 } 1654 1655 #endif /* _NET_XFRM_H */ 1656