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 /* used to fix curlft->add_time when changing date */ 217 long saved_tmo; 218 219 /* Last used time */ 220 unsigned long lastused; 221 222 /* Reference to data common to all the instances of this 223 * transformer. */ 224 const struct xfrm_type *type; 225 struct xfrm_mode *inner_mode; 226 struct xfrm_mode *inner_mode_iaf; 227 struct xfrm_mode *outer_mode; 228 229 /* Security context */ 230 struct xfrm_sec_ctx *security; 231 232 /* Private data of this transformer, format is opaque, 233 * interpreted by xfrm_type methods. */ 234 void *data; 235 }; 236 237 static inline struct net *xs_net(struct xfrm_state *x) 238 { 239 return read_pnet(&x->xs_net); 240 } 241 242 /* xflags - make enum if more show up */ 243 #define XFRM_TIME_DEFER 1 244 #define XFRM_SOFT_EXPIRE 2 245 246 enum { 247 XFRM_STATE_VOID, 248 XFRM_STATE_ACQ, 249 XFRM_STATE_VALID, 250 XFRM_STATE_ERROR, 251 XFRM_STATE_EXPIRED, 252 XFRM_STATE_DEAD 253 }; 254 255 /* callback structure passed from either netlink or pfkey */ 256 struct km_event { 257 union { 258 u32 hard; 259 u32 proto; 260 u32 byid; 261 u32 aevent; 262 u32 type; 263 } data; 264 265 u32 seq; 266 u32 pid; 267 u32 event; 268 struct net *net; 269 }; 270 271 struct xfrm_replay { 272 void (*advance)(struct xfrm_state *x, __be32 net_seq); 273 int (*check)(struct xfrm_state *x, 274 struct sk_buff *skb, 275 __be32 net_seq); 276 void (*notify)(struct xfrm_state *x, int event); 277 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb); 278 }; 279 280 struct net_device; 281 struct xfrm_type; 282 struct xfrm_dst; 283 struct xfrm_policy_afinfo { 284 unsigned short family; 285 struct dst_ops *dst_ops; 286 void (*garbage_collect)(struct net *net); 287 struct dst_entry *(*dst_lookup)(struct net *net, int tos, 288 const xfrm_address_t *saddr, 289 const xfrm_address_t *daddr); 290 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr); 291 void (*decode_session)(struct sk_buff *skb, 292 struct flowi *fl, 293 int reverse); 294 int (*get_tos)(const struct flowi *fl); 295 int (*init_path)(struct xfrm_dst *path, 296 struct dst_entry *dst, 297 int nfheader_len); 298 int (*fill_dst)(struct xfrm_dst *xdst, 299 struct net_device *dev, 300 const struct flowi *fl); 301 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig); 302 }; 303 304 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); 305 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); 306 extern void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c); 307 extern void km_state_notify(struct xfrm_state *x, const struct km_event *c); 308 309 struct xfrm_tmpl; 310 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); 311 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid); 312 extern int __xfrm_state_delete(struct xfrm_state *x); 313 314 struct xfrm_state_afinfo { 315 unsigned int family; 316 unsigned int proto; 317 __be16 eth_proto; 318 struct module *owner; 319 const struct xfrm_type *type_map[IPPROTO_MAX]; 320 struct xfrm_mode *mode_map[XFRM_MODE_MAX]; 321 int (*init_flags)(struct xfrm_state *x); 322 void (*init_tempsel)(struct xfrm_selector *sel, 323 const struct flowi *fl); 324 void (*init_temprop)(struct xfrm_state *x, 325 const struct xfrm_tmpl *tmpl, 326 const xfrm_address_t *daddr, 327 const xfrm_address_t *saddr); 328 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n); 329 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n); 330 int (*output)(struct sk_buff *skb); 331 int (*output_finish)(struct sk_buff *skb); 332 int (*extract_input)(struct xfrm_state *x, 333 struct sk_buff *skb); 334 int (*extract_output)(struct xfrm_state *x, 335 struct sk_buff *skb); 336 int (*transport_finish)(struct sk_buff *skb, 337 int async); 338 }; 339 340 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 341 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 342 343 extern void xfrm_state_delete_tunnel(struct xfrm_state *x); 344 345 struct xfrm_type { 346 char *description; 347 struct module *owner; 348 u8 proto; 349 u8 flags; 350 #define XFRM_TYPE_NON_FRAGMENT 1 351 #define XFRM_TYPE_REPLAY_PROT 2 352 #define XFRM_TYPE_LOCAL_COADDR 4 353 #define XFRM_TYPE_REMOTE_COADDR 8 354 355 int (*init_state)(struct xfrm_state *x); 356 void (*destructor)(struct xfrm_state *); 357 int (*input)(struct xfrm_state *, struct sk_buff *skb); 358 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 359 int (*reject)(struct xfrm_state *, struct sk_buff *, 360 const struct flowi *); 361 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **); 362 /* Estimate maximal size of result of transformation of a dgram */ 363 u32 (*get_mtu)(struct xfrm_state *, int size); 364 }; 365 366 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family); 367 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); 368 369 struct xfrm_mode { 370 /* 371 * Remove encapsulation header. 372 * 373 * The IP header will be moved over the top of the encapsulation 374 * header. 375 * 376 * On entry, the transport header shall point to where the IP header 377 * should be and the network header shall be set to where the IP 378 * header currently is. skb->data shall point to the start of the 379 * payload. 380 */ 381 int (*input2)(struct xfrm_state *x, struct sk_buff *skb); 382 383 /* 384 * This is the actual input entry point. 385 * 386 * For transport mode and equivalent this would be identical to 387 * input2 (which does not need to be set). While tunnel mode 388 * and equivalent would set this to the tunnel encapsulation function 389 * xfrm4_prepare_input that would in turn call input2. 390 */ 391 int (*input)(struct xfrm_state *x, struct sk_buff *skb); 392 393 /* 394 * Add encapsulation header. 395 * 396 * On exit, the transport header will be set to the start of the 397 * encapsulation header to be filled in by x->type->output and 398 * the mac header will be set to the nextheader (protocol for 399 * IPv4) field of the extension header directly preceding the 400 * encapsulation header, or in its absence, that of the top IP 401 * header. The value of the network header will always point 402 * to the top IP header while skb->data will point to the payload. 403 */ 404 int (*output2)(struct xfrm_state *x,struct sk_buff *skb); 405 406 /* 407 * This is the actual output entry point. 408 * 409 * For transport mode and equivalent this would be identical to 410 * output2 (which does not need to be set). While tunnel mode 411 * and equivalent would set this to a tunnel encapsulation function 412 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn 413 * call output2. 414 */ 415 int (*output)(struct xfrm_state *x, struct sk_buff *skb); 416 417 struct xfrm_state_afinfo *afinfo; 418 struct module *owner; 419 unsigned int encap; 420 int flags; 421 }; 422 423 /* Flags for xfrm_mode. */ 424 enum { 425 XFRM_MODE_FLAG_TUNNEL = 1, 426 }; 427 428 extern int xfrm_register_mode(struct xfrm_mode *mode, int family); 429 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family); 430 431 static inline int xfrm_af2proto(unsigned int family) 432 { 433 switch(family) { 434 case AF_INET: 435 return IPPROTO_IPIP; 436 case AF_INET6: 437 return IPPROTO_IPV6; 438 default: 439 return 0; 440 } 441 } 442 443 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto) 444 { 445 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) || 446 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6)) 447 return x->inner_mode; 448 else 449 return x->inner_mode_iaf; 450 } 451 452 struct xfrm_tmpl { 453 /* id in template is interpreted as: 454 * daddr - destination of tunnel, may be zero for transport mode. 455 * spi - zero to acquire spi. Not zero if spi is static, then 456 * daddr must be fixed too. 457 * proto - AH/ESP/IPCOMP 458 */ 459 struct xfrm_id id; 460 461 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 462 xfrm_address_t saddr; 463 464 unsigned short encap_family; 465 466 u32 reqid; 467 468 /* Mode: transport, tunnel etc. */ 469 u8 mode; 470 471 /* Sharing mode: unique, this session only, this user only etc. */ 472 u8 share; 473 474 /* May skip this transfomration if no SA is found */ 475 u8 optional; 476 477 /* Skip aalgos/ealgos/calgos checks. */ 478 u8 allalgs; 479 480 /* Bit mask of algos allowed for acquisition */ 481 u32 aalgos; 482 u32 ealgos; 483 u32 calgos; 484 }; 485 486 #define XFRM_MAX_DEPTH 6 487 488 struct xfrm_policy_walk_entry { 489 struct list_head all; 490 u8 dead; 491 }; 492 493 struct xfrm_policy_walk { 494 struct xfrm_policy_walk_entry walk; 495 u8 type; 496 u32 seq; 497 }; 498 499 struct xfrm_policy { 500 #ifdef CONFIG_NET_NS 501 struct net *xp_net; 502 #endif 503 struct hlist_node bydst; 504 struct hlist_node byidx; 505 506 /* This lock only affects elements except for entry. */ 507 rwlock_t lock; 508 atomic_t refcnt; 509 struct timer_list timer; 510 511 struct flow_cache_object flo; 512 atomic_t genid; 513 u32 priority; 514 u32 index; 515 struct xfrm_mark mark; 516 struct xfrm_selector selector; 517 struct xfrm_lifetime_cfg lft; 518 struct xfrm_lifetime_cur curlft; 519 struct xfrm_policy_walk_entry walk; 520 u8 type; 521 u8 action; 522 u8 flags; 523 u8 xfrm_nr; 524 u16 family; 525 struct xfrm_sec_ctx *security; 526 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 527 }; 528 529 static inline struct net *xp_net(const struct xfrm_policy *xp) 530 { 531 return read_pnet(&xp->xp_net); 532 } 533 534 struct xfrm_kmaddress { 535 xfrm_address_t local; 536 xfrm_address_t remote; 537 u32 reserved; 538 u16 family; 539 }; 540 541 struct xfrm_migrate { 542 xfrm_address_t old_daddr; 543 xfrm_address_t old_saddr; 544 xfrm_address_t new_daddr; 545 xfrm_address_t new_saddr; 546 u8 proto; 547 u8 mode; 548 u16 reserved; 549 u32 reqid; 550 u16 old_family; 551 u16 new_family; 552 }; 553 554 #define XFRM_KM_TIMEOUT 30 555 /* which seqno */ 556 #define XFRM_REPLAY_SEQ 1 557 #define XFRM_REPLAY_OSEQ 2 558 #define XFRM_REPLAY_SEQ_MASK 3 559 /* what happened */ 560 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 561 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 562 563 /* default aevent timeout in units of 100ms */ 564 #define XFRM_AE_ETIME 10 565 /* Async Event timer multiplier */ 566 #define XFRM_AE_ETH_M 10 567 /* default seq threshold size */ 568 #define XFRM_AE_SEQT_SIZE 2 569 570 struct xfrm_mgr { 571 struct list_head list; 572 char *id; 573 int (*notify)(struct xfrm_state *x, const struct km_event *c); 574 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); 575 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 576 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 577 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c); 578 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 579 int (*migrate)(const struct xfrm_selector *sel, 580 u8 dir, u8 type, 581 const struct xfrm_migrate *m, 582 int num_bundles, 583 const struct xfrm_kmaddress *k); 584 }; 585 586 extern int xfrm_register_km(struct xfrm_mgr *km); 587 extern int xfrm_unregister_km(struct xfrm_mgr *km); 588 589 /* 590 * This structure is used for the duration where packets are being 591 * transformed by IPsec. As soon as the packet leaves IPsec the 592 * area beyond the generic IP part may be overwritten. 593 */ 594 struct xfrm_skb_cb { 595 union { 596 struct inet_skb_parm h4; 597 struct inet6_skb_parm h6; 598 } header; 599 600 /* Sequence number for replay protection. */ 601 union { 602 struct { 603 __u32 low; 604 __u32 hi; 605 } output; 606 struct { 607 __be32 low; 608 __be32 hi; 609 } input; 610 } seq; 611 }; 612 613 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) 614 615 /* 616 * This structure is used by the afinfo prepare_input/prepare_output functions 617 * to transmit header information to the mode input/output functions. 618 */ 619 struct xfrm_mode_skb_cb { 620 union { 621 struct inet_skb_parm h4; 622 struct inet6_skb_parm h6; 623 } header; 624 625 /* Copied from header for IPv4, always set to zero and DF for IPv6. */ 626 __be16 id; 627 __be16 frag_off; 628 629 /* IP header length (excluding options or extension headers). */ 630 u8 ihl; 631 632 /* TOS for IPv4, class for IPv6. */ 633 u8 tos; 634 635 /* TTL for IPv4, hop limitfor IPv6. */ 636 u8 ttl; 637 638 /* Protocol for IPv4, NH for IPv6. */ 639 u8 protocol; 640 641 /* Option length for IPv4, zero for IPv6. */ 642 u8 optlen; 643 644 /* Used by IPv6 only, zero for IPv4. */ 645 u8 flow_lbl[3]; 646 }; 647 648 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0])) 649 650 /* 651 * This structure is used by the input processing to locate the SPI and 652 * related information. 653 */ 654 struct xfrm_spi_skb_cb { 655 union { 656 struct inet_skb_parm h4; 657 struct inet6_skb_parm h6; 658 } header; 659 660 unsigned int daddroff; 661 unsigned int family; 662 }; 663 664 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0])) 665 666 /* Audit Information */ 667 struct xfrm_audit { 668 u32 secid; 669 uid_t loginuid; 670 u32 sessionid; 671 }; 672 673 #ifdef CONFIG_AUDITSYSCALL 674 static inline struct audit_buffer *xfrm_audit_start(const char *op) 675 { 676 struct audit_buffer *audit_buf = NULL; 677 678 if (audit_enabled == 0) 679 return NULL; 680 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, 681 AUDIT_MAC_IPSEC_EVENT); 682 if (audit_buf == NULL) 683 return NULL; 684 audit_log_format(audit_buf, "op=%s", op); 685 return audit_buf; 686 } 687 688 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid, 689 struct audit_buffer *audit_buf) 690 { 691 char *secctx; 692 u32 secctx_len; 693 694 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses); 695 if (secid != 0 && 696 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) { 697 audit_log_format(audit_buf, " subj=%s", secctx); 698 security_release_secctx(secctx, secctx_len); 699 } else 700 audit_log_task_context(audit_buf); 701 } 702 703 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 704 u32 auid, u32 ses, u32 secid); 705 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 706 u32 auid, u32 ses, u32 secid); 707 extern void xfrm_audit_state_add(struct xfrm_state *x, int result, 708 u32 auid, u32 ses, u32 secid); 709 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result, 710 u32 auid, u32 ses, u32 secid); 711 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 712 struct sk_buff *skb); 713 extern void xfrm_audit_state_replay(struct xfrm_state *x, 714 struct sk_buff *skb, __be32 net_seq); 715 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family); 716 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 717 __be32 net_spi, __be32 net_seq); 718 extern void xfrm_audit_state_icvfail(struct xfrm_state *x, 719 struct sk_buff *skb, u8 proto); 720 #else 721 722 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 723 u32 auid, u32 ses, u32 secid) 724 { 725 } 726 727 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 728 u32 auid, u32 ses, u32 secid) 729 { 730 } 731 732 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result, 733 u32 auid, u32 ses, u32 secid) 734 { 735 } 736 737 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result, 738 u32 auid, u32 ses, u32 secid) 739 { 740 } 741 742 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 743 struct sk_buff *skb) 744 { 745 } 746 747 static inline void xfrm_audit_state_replay(struct xfrm_state *x, 748 struct sk_buff *skb, __be32 net_seq) 749 { 750 } 751 752 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb, 753 u16 family) 754 { 755 } 756 757 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 758 __be32 net_spi, __be32 net_seq) 759 { 760 } 761 762 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x, 763 struct sk_buff *skb, u8 proto) 764 { 765 } 766 #endif /* CONFIG_AUDITSYSCALL */ 767 768 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 769 { 770 if (likely(policy != NULL)) 771 atomic_inc(&policy->refcnt); 772 } 773 774 extern void xfrm_policy_destroy(struct xfrm_policy *policy); 775 776 static inline void xfrm_pol_put(struct xfrm_policy *policy) 777 { 778 if (atomic_dec_and_test(&policy->refcnt)) 779 xfrm_policy_destroy(policy); 780 } 781 782 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 783 { 784 int i; 785 for (i = npols - 1; i >= 0; --i) 786 xfrm_pol_put(pols[i]); 787 } 788 789 extern void __xfrm_state_destroy(struct xfrm_state *); 790 791 static inline void __xfrm_state_put(struct xfrm_state *x) 792 { 793 atomic_dec(&x->refcnt); 794 } 795 796 static inline void xfrm_state_put(struct xfrm_state *x) 797 { 798 if (atomic_dec_and_test(&x->refcnt)) 799 __xfrm_state_destroy(x); 800 } 801 802 static inline void xfrm_state_hold(struct xfrm_state *x) 803 { 804 atomic_inc(&x->refcnt); 805 } 806 807 static inline bool addr_match(const void *token1, const void *token2, 808 int prefixlen) 809 { 810 const __be32 *a1 = token1; 811 const __be32 *a2 = token2; 812 int pdw; 813 int pbi; 814 815 pdw = prefixlen >> 5; /* num of whole u32 in prefix */ 816 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 817 818 if (pdw) 819 if (memcmp(a1, a2, pdw << 2)) 820 return false; 821 822 if (pbi) { 823 __be32 mask; 824 825 mask = htonl((0xffffffff) << (32 - pbi)); 826 827 if ((a1[pdw] ^ a2[pdw]) & mask) 828 return false; 829 } 830 831 return true; 832 } 833 834 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen) 835 { 836 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */ 837 if (prefixlen == 0) 838 return true; 839 return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen))); 840 } 841 842 static __inline__ 843 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli) 844 { 845 __be16 port; 846 switch(fl->flowi_proto) { 847 case IPPROTO_TCP: 848 case IPPROTO_UDP: 849 case IPPROTO_UDPLITE: 850 case IPPROTO_SCTP: 851 port = uli->ports.sport; 852 break; 853 case IPPROTO_ICMP: 854 case IPPROTO_ICMPV6: 855 port = htons(uli->icmpt.type); 856 break; 857 case IPPROTO_MH: 858 port = htons(uli->mht.type); 859 break; 860 case IPPROTO_GRE: 861 port = htons(ntohl(uli->gre_key) >> 16); 862 break; 863 default: 864 port = 0; /*XXX*/ 865 } 866 return port; 867 } 868 869 static __inline__ 870 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli) 871 { 872 __be16 port; 873 switch(fl->flowi_proto) { 874 case IPPROTO_TCP: 875 case IPPROTO_UDP: 876 case IPPROTO_UDPLITE: 877 case IPPROTO_SCTP: 878 port = uli->ports.dport; 879 break; 880 case IPPROTO_ICMP: 881 case IPPROTO_ICMPV6: 882 port = htons(uli->icmpt.code); 883 break; 884 case IPPROTO_GRE: 885 port = htons(ntohl(uli->gre_key) & 0xffff); 886 break; 887 default: 888 port = 0; /*XXX*/ 889 } 890 return port; 891 } 892 893 extern bool xfrm_selector_match(const struct xfrm_selector *sel, 894 const struct flowi *fl, 895 unsigned short family); 896 897 #ifdef CONFIG_SECURITY_NETWORK_XFRM 898 /* If neither has a context --> match 899 * Otherwise, both must have a context and the sids, doi, alg must match 900 */ 901 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 902 { 903 return ((!s1 && !s2) || 904 (s1 && s2 && 905 (s1->ctx_sid == s2->ctx_sid) && 906 (s1->ctx_doi == s2->ctx_doi) && 907 (s1->ctx_alg == s2->ctx_alg))); 908 } 909 #else 910 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 911 { 912 return true; 913 } 914 #endif 915 916 /* A struct encoding bundle of transformations to apply to some set of flow. 917 * 918 * dst->child points to the next element of bundle. 919 * dst->xfrm points to an instanse of transformer. 920 * 921 * Due to unfortunate limitations of current routing cache, which we 922 * have no time to fix, it mirrors struct rtable and bound to the same 923 * routing key, including saddr,daddr. However, we can have many of 924 * bundles differing by session id. All the bundles grow from a parent 925 * policy rule. 926 */ 927 struct xfrm_dst { 928 union { 929 struct dst_entry dst; 930 struct rtable rt; 931 struct rt6_info rt6; 932 } u; 933 struct dst_entry *route; 934 struct flow_cache_object flo; 935 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; 936 int num_pols, num_xfrms; 937 #ifdef CONFIG_XFRM_SUB_POLICY 938 struct flowi *origin; 939 struct xfrm_selector *partner; 940 #endif 941 u32 xfrm_genid; 942 u32 policy_genid; 943 u32 route_mtu_cached; 944 u32 child_mtu_cached; 945 u32 route_cookie; 946 u32 path_cookie; 947 }; 948 949 #ifdef CONFIG_XFRM 950 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 951 { 952 xfrm_pols_put(xdst->pols, xdst->num_pols); 953 dst_release(xdst->route); 954 if (likely(xdst->u.dst.xfrm)) 955 xfrm_state_put(xdst->u.dst.xfrm); 956 #ifdef CONFIG_XFRM_SUB_POLICY 957 kfree(xdst->origin); 958 xdst->origin = NULL; 959 kfree(xdst->partner); 960 xdst->partner = NULL; 961 #endif 962 } 963 #endif 964 965 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 966 967 struct sec_path { 968 atomic_t refcnt; 969 int len; 970 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 971 }; 972 973 static inline int secpath_exists(struct sk_buff *skb) 974 { 975 #ifdef CONFIG_XFRM 976 return skb->sp != NULL; 977 #else 978 return 0; 979 #endif 980 } 981 982 static inline struct sec_path * 983 secpath_get(struct sec_path *sp) 984 { 985 if (sp) 986 atomic_inc(&sp->refcnt); 987 return sp; 988 } 989 990 extern void __secpath_destroy(struct sec_path *sp); 991 992 static inline void 993 secpath_put(struct sec_path *sp) 994 { 995 if (sp && atomic_dec_and_test(&sp->refcnt)) 996 __secpath_destroy(sp); 997 } 998 999 extern struct sec_path *secpath_dup(struct sec_path *src); 1000 1001 static inline void 1002 secpath_reset(struct sk_buff *skb) 1003 { 1004 #ifdef CONFIG_XFRM 1005 secpath_put(skb->sp); 1006 skb->sp = NULL; 1007 #endif 1008 } 1009 1010 static inline int 1011 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family) 1012 { 1013 switch (family) { 1014 case AF_INET: 1015 return addr->a4 == 0; 1016 case AF_INET6: 1017 return ipv6_addr_any((struct in6_addr *)&addr->a6); 1018 } 1019 return 0; 1020 } 1021 1022 static inline int 1023 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1024 { 1025 return (tmpl->saddr.a4 && 1026 tmpl->saddr.a4 != x->props.saddr.a4); 1027 } 1028 1029 static inline int 1030 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1031 { 1032 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 1033 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 1034 } 1035 1036 static inline int 1037 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family) 1038 { 1039 switch (family) { 1040 case AF_INET: 1041 return __xfrm4_state_addr_cmp(tmpl, x); 1042 case AF_INET6: 1043 return __xfrm6_state_addr_cmp(tmpl, x); 1044 } 1045 return !0; 1046 } 1047 1048 #ifdef CONFIG_XFRM 1049 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); 1050 1051 static inline int __xfrm_policy_check2(struct sock *sk, int dir, 1052 struct sk_buff *skb, 1053 unsigned int family, int reverse) 1054 { 1055 struct net *net = dev_net(skb->dev); 1056 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); 1057 1058 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 1059 return __xfrm_policy_check(sk, ndir, skb, family); 1060 1061 return (!net->xfrm.policy_count[dir] && !skb->sp) || 1062 (skb_dst(skb)->flags & DST_NOPOLICY) || 1063 __xfrm_policy_check(sk, ndir, skb, family); 1064 } 1065 1066 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1067 { 1068 return __xfrm_policy_check2(sk, dir, skb, family, 0); 1069 } 1070 1071 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1072 { 1073 return xfrm_policy_check(sk, dir, skb, AF_INET); 1074 } 1075 1076 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1077 { 1078 return xfrm_policy_check(sk, dir, skb, AF_INET6); 1079 } 1080 1081 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1082 struct sk_buff *skb) 1083 { 1084 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); 1085 } 1086 1087 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1088 struct sk_buff *skb) 1089 { 1090 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); 1091 } 1092 1093 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1094 unsigned int family, int reverse); 1095 1096 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1097 unsigned int family) 1098 { 1099 return __xfrm_decode_session(skb, fl, family, 0); 1100 } 1101 1102 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1103 struct flowi *fl, 1104 unsigned int family) 1105 { 1106 return __xfrm_decode_session(skb, fl, family, 1); 1107 } 1108 1109 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 1110 1111 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 1112 { 1113 struct net *net = dev_net(skb->dev); 1114 1115 return !net->xfrm.policy_count[XFRM_POLICY_OUT] || 1116 (skb_dst(skb)->flags & DST_NOXFRM) || 1117 __xfrm_route_forward(skb, family); 1118 } 1119 1120 static inline int xfrm4_route_forward(struct sk_buff *skb) 1121 { 1122 return xfrm_route_forward(skb, AF_INET); 1123 } 1124 1125 static inline int xfrm6_route_forward(struct sk_buff *skb) 1126 { 1127 return xfrm_route_forward(skb, AF_INET6); 1128 } 1129 1130 extern int __xfrm_sk_clone_policy(struct sock *sk); 1131 1132 static inline int xfrm_sk_clone_policy(struct sock *sk) 1133 { 1134 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) 1135 return __xfrm_sk_clone_policy(sk); 1136 return 0; 1137 } 1138 1139 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 1140 1141 static inline void xfrm_sk_free_policy(struct sock *sk) 1142 { 1143 if (unlikely(sk->sk_policy[0] != NULL)) { 1144 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); 1145 sk->sk_policy[0] = NULL; 1146 } 1147 if (unlikely(sk->sk_policy[1] != NULL)) { 1148 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); 1149 sk->sk_policy[1] = NULL; 1150 } 1151 } 1152 1153 #else 1154 1155 static inline void xfrm_sk_free_policy(struct sock *sk) {} 1156 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } 1157 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 1158 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 1159 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1160 { 1161 return 1; 1162 } 1163 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1164 { 1165 return 1; 1166 } 1167 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1168 { 1169 return 1; 1170 } 1171 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1172 struct flowi *fl, 1173 unsigned int family) 1174 { 1175 return -ENOSYS; 1176 } 1177 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1178 struct sk_buff *skb) 1179 { 1180 return 1; 1181 } 1182 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1183 struct sk_buff *skb) 1184 { 1185 return 1; 1186 } 1187 #endif 1188 1189 static __inline__ 1190 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family) 1191 { 1192 switch (family){ 1193 case AF_INET: 1194 return (xfrm_address_t *)&fl->u.ip4.daddr; 1195 case AF_INET6: 1196 return (xfrm_address_t *)&fl->u.ip6.daddr; 1197 } 1198 return NULL; 1199 } 1200 1201 static __inline__ 1202 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family) 1203 { 1204 switch (family){ 1205 case AF_INET: 1206 return (xfrm_address_t *)&fl->u.ip4.saddr; 1207 case AF_INET6: 1208 return (xfrm_address_t *)&fl->u.ip6.saddr; 1209 } 1210 return NULL; 1211 } 1212 1213 static __inline__ 1214 void xfrm_flowi_addr_get(const struct flowi *fl, 1215 xfrm_address_t *saddr, xfrm_address_t *daddr, 1216 unsigned short family) 1217 { 1218 switch(family) { 1219 case AF_INET: 1220 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4)); 1221 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4)); 1222 break; 1223 case AF_INET6: 1224 *(struct in6_addr *)saddr->a6 = fl->u.ip6.saddr; 1225 *(struct in6_addr *)daddr->a6 = fl->u.ip6.daddr; 1226 break; 1227 } 1228 } 1229 1230 static __inline__ int 1231 __xfrm4_state_addr_check(const struct xfrm_state *x, 1232 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1233 { 1234 if (daddr->a4 == x->id.daddr.a4 && 1235 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 1236 return 1; 1237 return 0; 1238 } 1239 1240 static __inline__ int 1241 __xfrm6_state_addr_check(const struct xfrm_state *x, 1242 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1243 { 1244 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 1245 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| 1246 ipv6_addr_any((struct in6_addr *)saddr) || 1247 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 1248 return 1; 1249 return 0; 1250 } 1251 1252 static __inline__ int 1253 xfrm_state_addr_check(const struct xfrm_state *x, 1254 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1255 unsigned short family) 1256 { 1257 switch (family) { 1258 case AF_INET: 1259 return __xfrm4_state_addr_check(x, daddr, saddr); 1260 case AF_INET6: 1261 return __xfrm6_state_addr_check(x, daddr, saddr); 1262 } 1263 return 0; 1264 } 1265 1266 static __inline__ int 1267 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl, 1268 unsigned short family) 1269 { 1270 switch (family) { 1271 case AF_INET: 1272 return __xfrm4_state_addr_check(x, 1273 (const xfrm_address_t *)&fl->u.ip4.daddr, 1274 (const xfrm_address_t *)&fl->u.ip4.saddr); 1275 case AF_INET6: 1276 return __xfrm6_state_addr_check(x, 1277 (const xfrm_address_t *)&fl->u.ip6.daddr, 1278 (const xfrm_address_t *)&fl->u.ip6.saddr); 1279 } 1280 return 0; 1281 } 1282 1283 static inline int xfrm_state_kern(const struct xfrm_state *x) 1284 { 1285 return atomic_read(&x->tunnel_users); 1286 } 1287 1288 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 1289 { 1290 return (!userproto || proto == userproto || 1291 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 1292 proto == IPPROTO_ESP || 1293 proto == IPPROTO_COMP))); 1294 } 1295 1296 /* 1297 * xfrm algorithm information 1298 */ 1299 struct xfrm_algo_aead_info { 1300 u16 icv_truncbits; 1301 }; 1302 1303 struct xfrm_algo_auth_info { 1304 u16 icv_truncbits; 1305 u16 icv_fullbits; 1306 }; 1307 1308 struct xfrm_algo_encr_info { 1309 u16 blockbits; 1310 u16 defkeybits; 1311 }; 1312 1313 struct xfrm_algo_comp_info { 1314 u16 threshold; 1315 }; 1316 1317 struct xfrm_algo_desc { 1318 char *name; 1319 char *compat; 1320 u8 available:1; 1321 union { 1322 struct xfrm_algo_aead_info aead; 1323 struct xfrm_algo_auth_info auth; 1324 struct xfrm_algo_encr_info encr; 1325 struct xfrm_algo_comp_info comp; 1326 } uinfo; 1327 struct sadb_alg desc; 1328 }; 1329 1330 /* XFRM tunnel handlers. */ 1331 struct xfrm_tunnel { 1332 int (*handler)(struct sk_buff *skb); 1333 int (*err_handler)(struct sk_buff *skb, u32 info); 1334 1335 struct xfrm_tunnel __rcu *next; 1336 int priority; 1337 }; 1338 1339 struct xfrm6_tunnel { 1340 int (*handler)(struct sk_buff *skb); 1341 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1342 u8 type, u8 code, int offset, __be32 info); 1343 struct xfrm6_tunnel __rcu *next; 1344 int priority; 1345 }; 1346 1347 extern void xfrm_init(void); 1348 extern void xfrm4_init(int rt_hash_size); 1349 extern int xfrm_state_init(struct net *net); 1350 extern void xfrm_state_fini(struct net *net); 1351 extern void xfrm4_state_init(void); 1352 #ifdef CONFIG_XFRM 1353 extern int xfrm6_init(void); 1354 extern void xfrm6_fini(void); 1355 extern int xfrm6_state_init(void); 1356 extern void xfrm6_state_fini(void); 1357 #else 1358 static inline int xfrm6_init(void) 1359 { 1360 return 0; 1361 } 1362 static inline void xfrm6_fini(void) 1363 { 1364 ; 1365 } 1366 #endif 1367 1368 #ifdef CONFIG_XFRM_STATISTICS 1369 extern int xfrm_proc_init(struct net *net); 1370 extern void xfrm_proc_fini(struct net *net); 1371 #endif 1372 1373 extern int xfrm_sysctl_init(struct net *net); 1374 #ifdef CONFIG_SYSCTL 1375 extern void xfrm_sysctl_fini(struct net *net); 1376 #else 1377 static inline void xfrm_sysctl_fini(struct net *net) 1378 { 1379 } 1380 #endif 1381 1382 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto); 1383 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1384 int (*func)(struct xfrm_state *, int, void*), void *); 1385 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk); 1386 extern struct xfrm_state *xfrm_state_alloc(struct net *net); 1387 extern struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr, 1388 const xfrm_address_t *saddr, 1389 const struct flowi *fl, 1390 struct xfrm_tmpl *tmpl, 1391 struct xfrm_policy *pol, int *err, 1392 unsigned short family); 1393 extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, 1394 xfrm_address_t *daddr, 1395 xfrm_address_t *saddr, 1396 unsigned short family, 1397 u8 mode, u8 proto, u32 reqid); 1398 extern int xfrm_state_check_expire(struct xfrm_state *x); 1399 extern void xfrm_state_insert(struct xfrm_state *x); 1400 extern int xfrm_state_add(struct xfrm_state *x); 1401 extern int xfrm_state_update(struct xfrm_state *x); 1402 extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark, 1403 const xfrm_address_t *daddr, __be32 spi, 1404 u8 proto, unsigned short family); 1405 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1406 const xfrm_address_t *daddr, 1407 const xfrm_address_t *saddr, 1408 u8 proto, 1409 unsigned short family); 1410 #ifdef CONFIG_XFRM_SUB_POLICY 1411 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 1412 int n, unsigned short family); 1413 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 1414 int n, unsigned short family); 1415 #else 1416 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 1417 int n, unsigned short family) 1418 { 1419 return -ENOSYS; 1420 } 1421 1422 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 1423 int n, unsigned short family) 1424 { 1425 return -ENOSYS; 1426 } 1427 #endif 1428 1429 struct xfrmk_sadinfo { 1430 u32 sadhcnt; /* current hash bkts */ 1431 u32 sadhmcnt; /* max allowed hash bkts */ 1432 u32 sadcnt; /* current running count */ 1433 }; 1434 1435 struct xfrmk_spdinfo { 1436 u32 incnt; 1437 u32 outcnt; 1438 u32 fwdcnt; 1439 u32 inscnt; 1440 u32 outscnt; 1441 u32 fwdscnt; 1442 u32 spdhcnt; 1443 u32 spdhmcnt; 1444 }; 1445 1446 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, 1447 u32 seq); 1448 extern int xfrm_state_delete(struct xfrm_state *x); 1449 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info); 1450 extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); 1451 extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); 1452 extern u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq); 1453 extern int xfrm_init_replay(struct xfrm_state *x); 1454 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); 1455 extern int __xfrm_init_state(struct xfrm_state *x, bool init_replay); 1456 extern int xfrm_init_state(struct xfrm_state *x); 1457 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb); 1458 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, 1459 int encap_type); 1460 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr); 1461 extern int xfrm_output_resume(struct sk_buff *skb, int err); 1462 extern int xfrm_output(struct sk_buff *skb); 1463 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1464 extern int xfrm4_extract_header(struct sk_buff *skb); 1465 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1466 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1467 int encap_type); 1468 extern int xfrm4_transport_finish(struct sk_buff *skb, int async); 1469 extern int xfrm4_rcv(struct sk_buff *skb); 1470 1471 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1472 { 1473 return xfrm4_rcv_encap(skb, nexthdr, spi, 0); 1474 } 1475 1476 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1477 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb); 1478 extern int xfrm4_output(struct sk_buff *skb); 1479 extern int xfrm4_output_finish(struct sk_buff *skb); 1480 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1481 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1482 extern int xfrm4_mode_tunnel_input_register(struct xfrm_tunnel *handler); 1483 extern int xfrm4_mode_tunnel_input_deregister(struct xfrm_tunnel *handler); 1484 extern int xfrm6_extract_header(struct sk_buff *skb); 1485 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1486 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi); 1487 extern int xfrm6_transport_finish(struct sk_buff *skb, int async); 1488 extern int xfrm6_rcv(struct sk_buff *skb); 1489 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1490 xfrm_address_t *saddr, u8 proto); 1491 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1492 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1493 extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr); 1494 extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr); 1495 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1496 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb); 1497 extern int xfrm6_output(struct sk_buff *skb); 1498 extern int xfrm6_output_finish(struct sk_buff *skb); 1499 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, 1500 u8 **prevhdr); 1501 1502 #ifdef CONFIG_XFRM 1503 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1504 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); 1505 #else 1506 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 1507 { 1508 return -ENOPROTOOPT; 1509 } 1510 1511 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb) 1512 { 1513 /* should not happen */ 1514 kfree_skb(skb); 1515 return 0; 1516 } 1517 #endif 1518 1519 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); 1520 1521 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); 1522 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, 1523 int (*func)(struct xfrm_policy *, int, int, void*), void *); 1524 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk); 1525 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1526 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, 1527 u8 type, int dir, 1528 struct xfrm_selector *sel, 1529 struct xfrm_sec_ctx *ctx, int delete, 1530 int *err); 1531 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err); 1532 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info); 1533 u32 xfrm_get_acqseq(void); 1534 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 1535 struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark, 1536 u8 mode, u32 reqid, u8 proto, 1537 const xfrm_address_t *daddr, 1538 const xfrm_address_t *saddr, int create, 1539 unsigned short family); 1540 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1541 1542 #ifdef CONFIG_XFRM_MIGRATE 1543 extern int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1544 const struct xfrm_migrate *m, int num_bundles, 1545 const struct xfrm_kmaddress *k); 1546 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m); 1547 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, 1548 struct xfrm_migrate *m); 1549 extern int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1550 struct xfrm_migrate *m, int num_bundles, 1551 struct xfrm_kmaddress *k); 1552 #endif 1553 1554 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1555 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid); 1556 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 1557 1558 extern void xfrm_input_init(void); 1559 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1560 1561 extern void xfrm_probe_algs(void); 1562 extern int xfrm_count_auth_supported(void); 1563 extern int xfrm_count_enc_supported(void); 1564 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1565 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1566 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1567 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1568 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1569 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe); 1570 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe); 1571 extern struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe); 1572 extern struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, 1573 int probe); 1574 1575 static inline int xfrm_addr_cmp(const xfrm_address_t *a, 1576 const xfrm_address_t *b, 1577 int family) 1578 { 1579 switch (family) { 1580 default: 1581 case AF_INET: 1582 return (__force u32)a->a4 - (__force u32)b->a4; 1583 case AF_INET6: 1584 return ipv6_addr_cmp((const struct in6_addr *)a, 1585 (const struct in6_addr *)b); 1586 } 1587 } 1588 1589 static inline int xfrm_policy_id2dir(u32 index) 1590 { 1591 return index & 7; 1592 } 1593 1594 #ifdef CONFIG_XFRM 1595 static inline int xfrm_aevent_is_on(struct net *net) 1596 { 1597 struct sock *nlsk; 1598 int ret = 0; 1599 1600 rcu_read_lock(); 1601 nlsk = rcu_dereference(net->xfrm.nlsk); 1602 if (nlsk) 1603 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1604 rcu_read_unlock(); 1605 return ret; 1606 } 1607 #endif 1608 1609 static inline int xfrm_alg_len(const struct xfrm_algo *alg) 1610 { 1611 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1612 } 1613 1614 static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg) 1615 { 1616 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1617 } 1618 1619 static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn) 1620 { 1621 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32); 1622 } 1623 1624 #ifdef CONFIG_XFRM_MIGRATE 1625 static inline int xfrm_replay_clone(struct xfrm_state *x, 1626 struct xfrm_state *orig) 1627 { 1628 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn), 1629 GFP_KERNEL); 1630 if (!x->replay_esn) 1631 return -ENOMEM; 1632 1633 x->replay_esn->bmp_len = orig->replay_esn->bmp_len; 1634 x->replay_esn->replay_window = orig->replay_esn->replay_window; 1635 1636 x->preplay_esn = kmemdup(x->replay_esn, 1637 xfrm_replay_state_esn_len(x->replay_esn), 1638 GFP_KERNEL); 1639 if (!x->preplay_esn) { 1640 kfree(x->replay_esn); 1641 return -ENOMEM; 1642 } 1643 1644 return 0; 1645 } 1646 1647 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1648 { 1649 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); 1650 } 1651 1652 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig) 1653 { 1654 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL); 1655 } 1656 1657 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1658 { 1659 int i; 1660 for (i = 0; i < n; i++) 1661 xfrm_state_put(*(states + i)); 1662 } 1663 1664 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1665 { 1666 int i; 1667 for (i = 0; i < n; i++) 1668 xfrm_state_delete(*(states + i)); 1669 } 1670 #endif 1671 1672 #ifdef CONFIG_XFRM 1673 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) 1674 { 1675 return skb->sp->xvec[skb->sp->len - 1]; 1676 } 1677 #endif 1678 1679 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) 1680 { 1681 if (attrs[XFRMA_MARK]) 1682 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark)); 1683 else 1684 m->v = m->m = 0; 1685 1686 return m->v & m->m; 1687 } 1688 1689 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m) 1690 { 1691 int ret = 0; 1692 1693 if (m->m | m->v) 1694 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); 1695 return ret; 1696 } 1697 1698 #endif /* _NET_XFRM_H */ 1699