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 #else 49 #define XFRM_INC_STATS(net, field) ((void)(net)) 50 #endif 51 52 53 /* Organization of SPD aka "XFRM rules" 54 ------------------------------------ 55 56 Basic objects: 57 - policy rule, struct xfrm_policy (=SPD entry) 58 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) 59 - instance of a transformer, struct xfrm_state (=SA) 60 - template to clone xfrm_state, struct xfrm_tmpl 61 62 SPD is plain linear list of xfrm_policy rules, ordered by priority. 63 (To be compatible with existing pfkeyv2 implementations, 64 many rules with priority of 0x7fffffff are allowed to exist and 65 such rules are ordered in an unpredictable way, thanks to bsd folks.) 66 67 Lookup is plain linear search until the first match with selector. 68 69 If "action" is "block", then we prohibit the flow, otherwise: 70 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, 71 policy entry has list of up to XFRM_MAX_DEPTH transformations, 72 described by templates xfrm_tmpl. Each template is resolved 73 to a complete xfrm_state (see below) and we pack bundle of transformations 74 to a dst_entry returned to requestor. 75 76 dst -. xfrm .-> xfrm_state #1 77 |---. child .-> dst -. xfrm .-> xfrm_state #2 78 |---. child .-> dst -. xfrm .-> xfrm_state #3 79 |---. child .-> NULL 80 81 Bundles are cached at xrfm_policy struct (field ->bundles). 82 83 84 Resolution of xrfm_tmpl 85 ----------------------- 86 Template contains: 87 1. ->mode Mode: transport or tunnel 88 2. ->id.proto Protocol: AH/ESP/IPCOMP 89 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. 90 Q: allow to resolve security gateway? 91 4. ->id.spi If not zero, static SPI. 92 5. ->saddr Local tunnel endpoint, ignored for transport mode. 93 6. ->algos List of allowed algos. Plain bitmask now. 94 Q: ealgos, aalgos, calgos. What a mess... 95 7. ->share Sharing mode. 96 Q: how to implement private sharing mode? To add struct sock* to 97 flow id? 98 99 Having this template we search through SAD searching for entries 100 with appropriate mode/proto/algo, permitted by selector. 101 If no appropriate entry found, it is requested from key manager. 102 103 PROBLEMS: 104 Q: How to find all the bundles referring to a physical path for 105 PMTU discovery? Seems, dst should contain list of all parents... 106 and enter to infinite locking hierarchy disaster. 107 No! It is easier, we will not search for them, let them find us. 108 We add genid to each dst plus pointer to genid of raw IP route, 109 pmtu disc will update pmtu on raw IP route and increase its genid. 110 dst_check() will see this for top level and trigger resyncing 111 metrics. Plus, it will be made via sk->sk_dst_cache. Solved. 112 */ 113 114 struct xfrm_state_walk { 115 struct list_head all; 116 u8 state; 117 u8 dying; 118 u8 proto; 119 u32 seq; 120 struct xfrm_address_filter *filter; 121 }; 122 123 /* Full description of state of transformer. */ 124 struct xfrm_state { 125 possible_net_t xs_net; 126 union { 127 struct hlist_node gclist; 128 struct hlist_node bydst; 129 }; 130 struct hlist_node bysrc; 131 struct hlist_node byspi; 132 133 atomic_t refcnt; 134 spinlock_t lock; 135 136 struct xfrm_id id; 137 struct xfrm_selector sel; 138 struct xfrm_mark mark; 139 u32 tfcpad; 140 141 u32 genid; 142 143 /* Key manager bits */ 144 struct xfrm_state_walk km; 145 146 /* Parameters of this state. */ 147 struct { 148 u32 reqid; 149 u8 mode; 150 u8 replay_window; 151 u8 aalgo, ealgo, calgo; 152 u8 flags; 153 u16 family; 154 xfrm_address_t saddr; 155 int header_len; 156 int trailer_len; 157 u32 extra_flags; 158 } props; 159 160 struct xfrm_lifetime_cfg lft; 161 162 /* Data for transformer */ 163 struct xfrm_algo_auth *aalg; 164 struct xfrm_algo *ealg; 165 struct xfrm_algo *calg; 166 struct xfrm_algo_aead *aead; 167 const char *geniv; 168 169 /* Data for encapsulator */ 170 struct xfrm_encap_tmpl *encap; 171 172 /* Data for care-of address */ 173 xfrm_address_t *coaddr; 174 175 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 176 struct xfrm_state *tunnel; 177 178 /* If a tunnel, number of users + 1 */ 179 atomic_t tunnel_users; 180 181 /* State for replay detection */ 182 struct xfrm_replay_state replay; 183 struct xfrm_replay_state_esn *replay_esn; 184 185 /* Replay detection state at the time we sent the last notification */ 186 struct xfrm_replay_state preplay; 187 struct xfrm_replay_state_esn *preplay_esn; 188 189 /* The functions for replay detection. */ 190 const struct xfrm_replay *repl; 191 192 /* internal flag that only holds state for delayed aevent at the 193 * moment 194 */ 195 u32 xflags; 196 197 /* Replay detection notification settings */ 198 u32 replay_maxage; 199 u32 replay_maxdiff; 200 201 /* Replay detection notification timer */ 202 struct timer_list rtimer; 203 204 /* Statistics */ 205 struct xfrm_stats stats; 206 207 struct xfrm_lifetime_cur curlft; 208 struct tasklet_hrtimer mtimer; 209 210 /* used to fix curlft->add_time when changing date */ 211 long saved_tmo; 212 213 /* Last used time */ 214 unsigned long lastused; 215 216 /* Reference to data common to all the instances of this 217 * transformer. */ 218 const struct xfrm_type *type; 219 struct xfrm_mode *inner_mode; 220 struct xfrm_mode *inner_mode_iaf; 221 struct xfrm_mode *outer_mode; 222 223 /* Security context */ 224 struct xfrm_sec_ctx *security; 225 226 /* Private data of this transformer, format is opaque, 227 * interpreted by xfrm_type methods. */ 228 void *data; 229 }; 230 231 static inline struct net *xs_net(struct xfrm_state *x) 232 { 233 return read_pnet(&x->xs_net); 234 } 235 236 /* xflags - make enum if more show up */ 237 #define XFRM_TIME_DEFER 1 238 #define XFRM_SOFT_EXPIRE 2 239 240 enum { 241 XFRM_STATE_VOID, 242 XFRM_STATE_ACQ, 243 XFRM_STATE_VALID, 244 XFRM_STATE_ERROR, 245 XFRM_STATE_EXPIRED, 246 XFRM_STATE_DEAD 247 }; 248 249 /* callback structure passed from either netlink or pfkey */ 250 struct km_event { 251 union { 252 u32 hard; 253 u32 proto; 254 u32 byid; 255 u32 aevent; 256 u32 type; 257 } data; 258 259 u32 seq; 260 u32 portid; 261 u32 event; 262 struct net *net; 263 }; 264 265 struct xfrm_replay { 266 void (*advance)(struct xfrm_state *x, __be32 net_seq); 267 int (*check)(struct xfrm_state *x, 268 struct sk_buff *skb, 269 __be32 net_seq); 270 int (*recheck)(struct xfrm_state *x, 271 struct sk_buff *skb, 272 __be32 net_seq); 273 void (*notify)(struct xfrm_state *x, int event); 274 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb); 275 }; 276 277 struct net_device; 278 struct xfrm_type; 279 struct xfrm_dst; 280 struct xfrm_policy_afinfo { 281 unsigned short family; 282 struct dst_ops *dst_ops; 283 void (*garbage_collect)(struct net *net); 284 struct dst_entry *(*dst_lookup)(struct net *net, 285 int tos, int oif, 286 const xfrm_address_t *saddr, 287 const xfrm_address_t *daddr); 288 int (*get_saddr)(struct net *net, int oif, 289 xfrm_address_t *saddr, 290 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 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); 305 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); 306 void km_policy_notify(struct xfrm_policy *xp, int dir, 307 const struct km_event *c); 308 void km_state_notify(struct xfrm_state *x, const struct km_event *c); 309 310 struct xfrm_tmpl; 311 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, 312 struct xfrm_policy *pol); 313 void km_state_expired(struct xfrm_state *x, int hard, u32 portid); 314 int __xfrm_state_delete(struct xfrm_state *x); 315 316 struct xfrm_state_afinfo { 317 unsigned int family; 318 unsigned int proto; 319 __be16 eth_proto; 320 struct module *owner; 321 const struct xfrm_type *type_map[IPPROTO_MAX]; 322 struct xfrm_mode *mode_map[XFRM_MODE_MAX]; 323 int (*init_flags)(struct xfrm_state *x); 324 void (*init_tempsel)(struct xfrm_selector *sel, 325 const struct flowi *fl); 326 void (*init_temprop)(struct xfrm_state *x, 327 const struct xfrm_tmpl *tmpl, 328 const xfrm_address_t *daddr, 329 const xfrm_address_t *saddr); 330 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n); 331 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n); 332 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb); 333 int (*output_finish)(struct sock *sk, struct sk_buff *skb); 334 int (*extract_input)(struct xfrm_state *x, 335 struct sk_buff *skb); 336 int (*extract_output)(struct xfrm_state *x, 337 struct sk_buff *skb); 338 int (*transport_finish)(struct sk_buff *skb, 339 int async); 340 void (*local_error)(struct sk_buff *skb, u32 mtu); 341 }; 342 343 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 344 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 345 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); 346 void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); 347 348 struct xfrm_input_afinfo { 349 unsigned int family; 350 struct module *owner; 351 int (*callback)(struct sk_buff *skb, u8 protocol, 352 int err); 353 }; 354 355 int xfrm_input_register_afinfo(struct xfrm_input_afinfo *afinfo); 356 int xfrm_input_unregister_afinfo(struct xfrm_input_afinfo *afinfo); 357 358 void xfrm_state_delete_tunnel(struct xfrm_state *x); 359 360 struct xfrm_type { 361 char *description; 362 struct module *owner; 363 u8 proto; 364 u8 flags; 365 #define XFRM_TYPE_NON_FRAGMENT 1 366 #define XFRM_TYPE_REPLAY_PROT 2 367 #define XFRM_TYPE_LOCAL_COADDR 4 368 #define XFRM_TYPE_REMOTE_COADDR 8 369 370 int (*init_state)(struct xfrm_state *x); 371 void (*destructor)(struct xfrm_state *); 372 int (*input)(struct xfrm_state *, struct sk_buff *skb); 373 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 374 int (*reject)(struct xfrm_state *, struct sk_buff *, 375 const struct flowi *); 376 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **); 377 /* Estimate maximal size of result of transformation of a dgram */ 378 u32 (*get_mtu)(struct xfrm_state *, int size); 379 }; 380 381 int xfrm_register_type(const struct xfrm_type *type, unsigned short family); 382 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); 383 384 struct xfrm_mode { 385 /* 386 * Remove encapsulation header. 387 * 388 * The IP header will be moved over the top of the encapsulation 389 * header. 390 * 391 * On entry, the transport header shall point to where the IP header 392 * should be and the network header shall be set to where the IP 393 * header currently is. skb->data shall point to the start of the 394 * payload. 395 */ 396 int (*input2)(struct xfrm_state *x, struct sk_buff *skb); 397 398 /* 399 * This is the actual input entry point. 400 * 401 * For transport mode and equivalent this would be identical to 402 * input2 (which does not need to be set). While tunnel mode 403 * and equivalent would set this to the tunnel encapsulation function 404 * xfrm4_prepare_input that would in turn call input2. 405 */ 406 int (*input)(struct xfrm_state *x, struct sk_buff *skb); 407 408 /* 409 * Add encapsulation header. 410 * 411 * On exit, the transport header will be set to the start of the 412 * encapsulation header to be filled in by x->type->output and 413 * the mac header will be set to the nextheader (protocol for 414 * IPv4) field of the extension header directly preceding the 415 * encapsulation header, or in its absence, that of the top IP 416 * header. The value of the network header will always point 417 * to the top IP header while skb->data will point to the payload. 418 */ 419 int (*output2)(struct xfrm_state *x,struct sk_buff *skb); 420 421 /* 422 * This is the actual output entry point. 423 * 424 * For transport mode and equivalent this would be identical to 425 * output2 (which does not need to be set). While tunnel mode 426 * and equivalent would set this to a tunnel encapsulation function 427 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn 428 * call output2. 429 */ 430 int (*output)(struct xfrm_state *x, struct sk_buff *skb); 431 432 struct xfrm_state_afinfo *afinfo; 433 struct module *owner; 434 unsigned int encap; 435 int flags; 436 }; 437 438 /* Flags for xfrm_mode. */ 439 enum { 440 XFRM_MODE_FLAG_TUNNEL = 1, 441 }; 442 443 int xfrm_register_mode(struct xfrm_mode *mode, int family); 444 int xfrm_unregister_mode(struct xfrm_mode *mode, int family); 445 446 static inline int xfrm_af2proto(unsigned int family) 447 { 448 switch(family) { 449 case AF_INET: 450 return IPPROTO_IPIP; 451 case AF_INET6: 452 return IPPROTO_IPV6; 453 default: 454 return 0; 455 } 456 } 457 458 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto) 459 { 460 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) || 461 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6)) 462 return x->inner_mode; 463 else 464 return x->inner_mode_iaf; 465 } 466 467 struct xfrm_tmpl { 468 /* id in template is interpreted as: 469 * daddr - destination of tunnel, may be zero for transport mode. 470 * spi - zero to acquire spi. Not zero if spi is static, then 471 * daddr must be fixed too. 472 * proto - AH/ESP/IPCOMP 473 */ 474 struct xfrm_id id; 475 476 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 477 xfrm_address_t saddr; 478 479 unsigned short encap_family; 480 481 u32 reqid; 482 483 /* Mode: transport, tunnel etc. */ 484 u8 mode; 485 486 /* Sharing mode: unique, this session only, this user only etc. */ 487 u8 share; 488 489 /* May skip this transfomration if no SA is found */ 490 u8 optional; 491 492 /* Skip aalgos/ealgos/calgos checks. */ 493 u8 allalgs; 494 495 /* Bit mask of algos allowed for acquisition */ 496 u32 aalgos; 497 u32 ealgos; 498 u32 calgos; 499 }; 500 501 #define XFRM_MAX_DEPTH 6 502 503 struct xfrm_policy_walk_entry { 504 struct list_head all; 505 u8 dead; 506 }; 507 508 struct xfrm_policy_walk { 509 struct xfrm_policy_walk_entry walk; 510 u8 type; 511 u32 seq; 512 }; 513 514 struct xfrm_policy_queue { 515 struct sk_buff_head hold_queue; 516 struct timer_list hold_timer; 517 unsigned long timeout; 518 }; 519 520 struct xfrm_policy { 521 possible_net_t xp_net; 522 struct hlist_node bydst; 523 struct hlist_node byidx; 524 525 /* This lock only affects elements except for entry. */ 526 rwlock_t lock; 527 atomic_t refcnt; 528 struct timer_list timer; 529 530 struct flow_cache_object flo; 531 atomic_t genid; 532 u32 priority; 533 u32 index; 534 struct xfrm_mark mark; 535 struct xfrm_selector selector; 536 struct xfrm_lifetime_cfg lft; 537 struct xfrm_lifetime_cur curlft; 538 struct xfrm_policy_walk_entry walk; 539 struct xfrm_policy_queue polq; 540 u8 type; 541 u8 action; 542 u8 flags; 543 u8 xfrm_nr; 544 u16 family; 545 struct xfrm_sec_ctx *security; 546 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 547 struct rcu_head rcu; 548 }; 549 550 static inline struct net *xp_net(const struct xfrm_policy *xp) 551 { 552 return read_pnet(&xp->xp_net); 553 } 554 555 struct xfrm_kmaddress { 556 xfrm_address_t local; 557 xfrm_address_t remote; 558 u32 reserved; 559 u16 family; 560 }; 561 562 struct xfrm_migrate { 563 xfrm_address_t old_daddr; 564 xfrm_address_t old_saddr; 565 xfrm_address_t new_daddr; 566 xfrm_address_t new_saddr; 567 u8 proto; 568 u8 mode; 569 u16 reserved; 570 u32 reqid; 571 u16 old_family; 572 u16 new_family; 573 }; 574 575 #define XFRM_KM_TIMEOUT 30 576 /* what happened */ 577 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 578 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 579 580 /* default aevent timeout in units of 100ms */ 581 #define XFRM_AE_ETIME 10 582 /* Async Event timer multiplier */ 583 #define XFRM_AE_ETH_M 10 584 /* default seq threshold size */ 585 #define XFRM_AE_SEQT_SIZE 2 586 587 struct xfrm_mgr { 588 struct list_head list; 589 char *id; 590 int (*notify)(struct xfrm_state *x, const struct km_event *c); 591 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp); 592 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 593 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 594 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c); 595 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 596 int (*migrate)(const struct xfrm_selector *sel, 597 u8 dir, u8 type, 598 const struct xfrm_migrate *m, 599 int num_bundles, 600 const struct xfrm_kmaddress *k); 601 bool (*is_alive)(const struct km_event *c); 602 }; 603 604 int xfrm_register_km(struct xfrm_mgr *km); 605 int xfrm_unregister_km(struct xfrm_mgr *km); 606 607 struct xfrm_tunnel_skb_cb { 608 union { 609 struct inet_skb_parm h4; 610 struct inet6_skb_parm h6; 611 } header; 612 613 union { 614 struct ip_tunnel *ip4; 615 struct ip6_tnl *ip6; 616 } tunnel; 617 }; 618 619 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0])) 620 621 /* 622 * This structure is used for the duration where packets are being 623 * transformed by IPsec. As soon as the packet leaves IPsec the 624 * area beyond the generic IP part may be overwritten. 625 */ 626 struct xfrm_skb_cb { 627 struct xfrm_tunnel_skb_cb header; 628 629 /* Sequence number for replay protection. */ 630 union { 631 struct { 632 __u32 low; 633 __u32 hi; 634 } output; 635 struct { 636 __be32 low; 637 __be32 hi; 638 } input; 639 } seq; 640 }; 641 642 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) 643 644 /* 645 * This structure is used by the afinfo prepare_input/prepare_output functions 646 * to transmit header information to the mode input/output functions. 647 */ 648 struct xfrm_mode_skb_cb { 649 struct xfrm_tunnel_skb_cb header; 650 651 /* Copied from header for IPv4, always set to zero and DF for IPv6. */ 652 __be16 id; 653 __be16 frag_off; 654 655 /* IP header length (excluding options or extension headers). */ 656 u8 ihl; 657 658 /* TOS for IPv4, class for IPv6. */ 659 u8 tos; 660 661 /* TTL for IPv4, hop limitfor IPv6. */ 662 u8 ttl; 663 664 /* Protocol for IPv4, NH for IPv6. */ 665 u8 protocol; 666 667 /* Option length for IPv4, zero for IPv6. */ 668 u8 optlen; 669 670 /* Used by IPv6 only, zero for IPv4. */ 671 u8 flow_lbl[3]; 672 }; 673 674 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0])) 675 676 /* 677 * This structure is used by the input processing to locate the SPI and 678 * related information. 679 */ 680 struct xfrm_spi_skb_cb { 681 struct xfrm_tunnel_skb_cb header; 682 683 unsigned int daddroff; 684 unsigned int family; 685 }; 686 687 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0])) 688 689 #ifdef CONFIG_AUDITSYSCALL 690 static inline struct audit_buffer *xfrm_audit_start(const char *op) 691 { 692 struct audit_buffer *audit_buf = NULL; 693 694 if (audit_enabled == 0) 695 return NULL; 696 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, 697 AUDIT_MAC_IPSEC_EVENT); 698 if (audit_buf == NULL) 699 return NULL; 700 audit_log_format(audit_buf, "op=%s", op); 701 return audit_buf; 702 } 703 704 static inline void xfrm_audit_helper_usrinfo(bool task_valid, 705 struct audit_buffer *audit_buf) 706 { 707 const unsigned int auid = from_kuid(&init_user_ns, task_valid ? 708 audit_get_loginuid(current) : 709 INVALID_UID); 710 const unsigned int ses = task_valid ? audit_get_sessionid(current) : 711 (unsigned int) -1; 712 713 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses); 714 audit_log_task_context(audit_buf); 715 } 716 717 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid); 718 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 719 bool task_valid); 720 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid); 721 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid); 722 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 723 struct sk_buff *skb); 724 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb, 725 __be32 net_seq); 726 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family); 727 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi, 728 __be32 net_seq); 729 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb, 730 u8 proto); 731 #else 732 733 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 734 bool task_valid) 735 { 736 } 737 738 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 739 bool task_valid) 740 { 741 } 742 743 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result, 744 bool task_valid) 745 { 746 } 747 748 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result, 749 bool task_valid) 750 { 751 } 752 753 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 754 struct sk_buff *skb) 755 { 756 } 757 758 static inline void xfrm_audit_state_replay(struct xfrm_state *x, 759 struct sk_buff *skb, __be32 net_seq) 760 { 761 } 762 763 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb, 764 u16 family) 765 { 766 } 767 768 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 769 __be32 net_spi, __be32 net_seq) 770 { 771 } 772 773 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x, 774 struct sk_buff *skb, u8 proto) 775 { 776 } 777 #endif /* CONFIG_AUDITSYSCALL */ 778 779 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 780 { 781 if (likely(policy != NULL)) 782 atomic_inc(&policy->refcnt); 783 } 784 785 void xfrm_policy_destroy(struct xfrm_policy *policy); 786 787 static inline void xfrm_pol_put(struct xfrm_policy *policy) 788 { 789 if (atomic_dec_and_test(&policy->refcnt)) 790 xfrm_policy_destroy(policy); 791 } 792 793 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 794 { 795 int i; 796 for (i = npols - 1; i >= 0; --i) 797 xfrm_pol_put(pols[i]); 798 } 799 800 void __xfrm_state_destroy(struct xfrm_state *); 801 802 static inline void __xfrm_state_put(struct xfrm_state *x) 803 { 804 atomic_dec(&x->refcnt); 805 } 806 807 static inline void xfrm_state_put(struct xfrm_state *x) 808 { 809 if (atomic_dec_and_test(&x->refcnt)) 810 __xfrm_state_destroy(x); 811 } 812 813 static inline void xfrm_state_hold(struct xfrm_state *x) 814 { 815 atomic_inc(&x->refcnt); 816 } 817 818 static inline bool addr_match(const void *token1, const void *token2, 819 int prefixlen) 820 { 821 const __be32 *a1 = token1; 822 const __be32 *a2 = token2; 823 int pdw; 824 int pbi; 825 826 pdw = prefixlen >> 5; /* num of whole u32 in prefix */ 827 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 828 829 if (pdw) 830 if (memcmp(a1, a2, pdw << 2)) 831 return false; 832 833 if (pbi) { 834 __be32 mask; 835 836 mask = htonl((0xffffffff) << (32 - pbi)); 837 838 if ((a1[pdw] ^ a2[pdw]) & mask) 839 return false; 840 } 841 842 return true; 843 } 844 845 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen) 846 { 847 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */ 848 if (prefixlen == 0) 849 return true; 850 return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen))); 851 } 852 853 static __inline__ 854 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli) 855 { 856 __be16 port; 857 switch(fl->flowi_proto) { 858 case IPPROTO_TCP: 859 case IPPROTO_UDP: 860 case IPPROTO_UDPLITE: 861 case IPPROTO_SCTP: 862 port = uli->ports.sport; 863 break; 864 case IPPROTO_ICMP: 865 case IPPROTO_ICMPV6: 866 port = htons(uli->icmpt.type); 867 break; 868 case IPPROTO_MH: 869 port = htons(uli->mht.type); 870 break; 871 case IPPROTO_GRE: 872 port = htons(ntohl(uli->gre_key) >> 16); 873 break; 874 default: 875 port = 0; /*XXX*/ 876 } 877 return port; 878 } 879 880 static __inline__ 881 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli) 882 { 883 __be16 port; 884 switch(fl->flowi_proto) { 885 case IPPROTO_TCP: 886 case IPPROTO_UDP: 887 case IPPROTO_UDPLITE: 888 case IPPROTO_SCTP: 889 port = uli->ports.dport; 890 break; 891 case IPPROTO_ICMP: 892 case IPPROTO_ICMPV6: 893 port = htons(uli->icmpt.code); 894 break; 895 case IPPROTO_GRE: 896 port = htons(ntohl(uli->gre_key) & 0xffff); 897 break; 898 default: 899 port = 0; /*XXX*/ 900 } 901 return port; 902 } 903 904 bool xfrm_selector_match(const struct xfrm_selector *sel, 905 const struct flowi *fl, unsigned short family); 906 907 #ifdef CONFIG_SECURITY_NETWORK_XFRM 908 /* If neither has a context --> match 909 * Otherwise, both must have a context and the sids, doi, alg must match 910 */ 911 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 912 { 913 return ((!s1 && !s2) || 914 (s1 && s2 && 915 (s1->ctx_sid == s2->ctx_sid) && 916 (s1->ctx_doi == s2->ctx_doi) && 917 (s1->ctx_alg == s2->ctx_alg))); 918 } 919 #else 920 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 921 { 922 return true; 923 } 924 #endif 925 926 /* A struct encoding bundle of transformations to apply to some set of flow. 927 * 928 * dst->child points to the next element of bundle. 929 * dst->xfrm points to an instanse of transformer. 930 * 931 * Due to unfortunate limitations of current routing cache, which we 932 * have no time to fix, it mirrors struct rtable and bound to the same 933 * routing key, including saddr,daddr. However, we can have many of 934 * bundles differing by session id. All the bundles grow from a parent 935 * policy rule. 936 */ 937 struct xfrm_dst { 938 union { 939 struct dst_entry dst; 940 struct rtable rt; 941 struct rt6_info rt6; 942 } u; 943 struct dst_entry *route; 944 struct flow_cache_object flo; 945 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; 946 int num_pols, num_xfrms; 947 #ifdef CONFIG_XFRM_SUB_POLICY 948 struct flowi *origin; 949 struct xfrm_selector *partner; 950 #endif 951 u32 xfrm_genid; 952 u32 policy_genid; 953 u32 route_mtu_cached; 954 u32 child_mtu_cached; 955 u32 route_cookie; 956 u32 path_cookie; 957 }; 958 959 #ifdef CONFIG_XFRM 960 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 961 { 962 xfrm_pols_put(xdst->pols, xdst->num_pols); 963 dst_release(xdst->route); 964 if (likely(xdst->u.dst.xfrm)) 965 xfrm_state_put(xdst->u.dst.xfrm); 966 #ifdef CONFIG_XFRM_SUB_POLICY 967 kfree(xdst->origin); 968 xdst->origin = NULL; 969 kfree(xdst->partner); 970 xdst->partner = NULL; 971 #endif 972 } 973 #endif 974 975 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 976 977 struct sec_path { 978 atomic_t refcnt; 979 int len; 980 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 981 }; 982 983 static inline int secpath_exists(struct sk_buff *skb) 984 { 985 #ifdef CONFIG_XFRM 986 return skb->sp != NULL; 987 #else 988 return 0; 989 #endif 990 } 991 992 static inline struct sec_path * 993 secpath_get(struct sec_path *sp) 994 { 995 if (sp) 996 atomic_inc(&sp->refcnt); 997 return sp; 998 } 999 1000 void __secpath_destroy(struct sec_path *sp); 1001 1002 static inline void 1003 secpath_put(struct sec_path *sp) 1004 { 1005 if (sp && atomic_dec_and_test(&sp->refcnt)) 1006 __secpath_destroy(sp); 1007 } 1008 1009 struct sec_path *secpath_dup(struct sec_path *src); 1010 1011 static inline void 1012 secpath_reset(struct sk_buff *skb) 1013 { 1014 #ifdef CONFIG_XFRM 1015 secpath_put(skb->sp); 1016 skb->sp = NULL; 1017 #endif 1018 } 1019 1020 static inline int 1021 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family) 1022 { 1023 switch (family) { 1024 case AF_INET: 1025 return addr->a4 == 0; 1026 case AF_INET6: 1027 return ipv6_addr_any(&addr->in6); 1028 } 1029 return 0; 1030 } 1031 1032 static inline int 1033 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1034 { 1035 return (tmpl->saddr.a4 && 1036 tmpl->saddr.a4 != x->props.saddr.a4); 1037 } 1038 1039 static inline int 1040 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1041 { 1042 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 1043 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 1044 } 1045 1046 static inline int 1047 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family) 1048 { 1049 switch (family) { 1050 case AF_INET: 1051 return __xfrm4_state_addr_cmp(tmpl, x); 1052 case AF_INET6: 1053 return __xfrm6_state_addr_cmp(tmpl, x); 1054 } 1055 return !0; 1056 } 1057 1058 #ifdef CONFIG_XFRM 1059 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, 1060 unsigned short family); 1061 1062 static inline int __xfrm_policy_check2(struct sock *sk, int dir, 1063 struct sk_buff *skb, 1064 unsigned int family, int reverse) 1065 { 1066 struct net *net = dev_net(skb->dev); 1067 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); 1068 1069 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 1070 return __xfrm_policy_check(sk, ndir, skb, family); 1071 1072 return (!net->xfrm.policy_count[dir] && !skb->sp) || 1073 (skb_dst(skb)->flags & DST_NOPOLICY) || 1074 __xfrm_policy_check(sk, ndir, skb, family); 1075 } 1076 1077 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1078 { 1079 return __xfrm_policy_check2(sk, dir, skb, family, 0); 1080 } 1081 1082 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1083 { 1084 return xfrm_policy_check(sk, dir, skb, AF_INET); 1085 } 1086 1087 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1088 { 1089 return xfrm_policy_check(sk, dir, skb, AF_INET6); 1090 } 1091 1092 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1093 struct sk_buff *skb) 1094 { 1095 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); 1096 } 1097 1098 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1099 struct sk_buff *skb) 1100 { 1101 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); 1102 } 1103 1104 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1105 unsigned int family, int reverse); 1106 1107 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1108 unsigned int family) 1109 { 1110 return __xfrm_decode_session(skb, fl, family, 0); 1111 } 1112 1113 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1114 struct flowi *fl, 1115 unsigned int family) 1116 { 1117 return __xfrm_decode_session(skb, fl, family, 1); 1118 } 1119 1120 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 1121 1122 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 1123 { 1124 struct net *net = dev_net(skb->dev); 1125 1126 return !net->xfrm.policy_count[XFRM_POLICY_OUT] || 1127 (skb_dst(skb)->flags & DST_NOXFRM) || 1128 __xfrm_route_forward(skb, family); 1129 } 1130 1131 static inline int xfrm4_route_forward(struct sk_buff *skb) 1132 { 1133 return xfrm_route_forward(skb, AF_INET); 1134 } 1135 1136 static inline int xfrm6_route_forward(struct sk_buff *skb) 1137 { 1138 return xfrm_route_forward(skb, AF_INET6); 1139 } 1140 1141 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk); 1142 1143 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) 1144 { 1145 sk->sk_policy[0] = NULL; 1146 sk->sk_policy[1] = NULL; 1147 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1])) 1148 return __xfrm_sk_clone_policy(sk, osk); 1149 return 0; 1150 } 1151 1152 int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 1153 1154 static inline void xfrm_sk_free_policy(struct sock *sk) 1155 { 1156 struct xfrm_policy *pol; 1157 1158 pol = rcu_dereference_protected(sk->sk_policy[0], 1); 1159 if (unlikely(pol != NULL)) { 1160 xfrm_policy_delete(pol, XFRM_POLICY_MAX); 1161 sk->sk_policy[0] = NULL; 1162 } 1163 pol = rcu_dereference_protected(sk->sk_policy[1], 1); 1164 if (unlikely(pol != NULL)) { 1165 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1); 1166 sk->sk_policy[1] = NULL; 1167 } 1168 } 1169 1170 void xfrm_garbage_collect(struct net *net); 1171 1172 #else 1173 1174 static inline void xfrm_sk_free_policy(struct sock *sk) {} 1175 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; } 1176 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 1177 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 1178 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1179 { 1180 return 1; 1181 } 1182 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1183 { 1184 return 1; 1185 } 1186 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1187 { 1188 return 1; 1189 } 1190 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1191 struct flowi *fl, 1192 unsigned int family) 1193 { 1194 return -ENOSYS; 1195 } 1196 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1197 struct sk_buff *skb) 1198 { 1199 return 1; 1200 } 1201 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1202 struct sk_buff *skb) 1203 { 1204 return 1; 1205 } 1206 static inline void xfrm_garbage_collect(struct net *net) 1207 { 1208 } 1209 #endif 1210 1211 static __inline__ 1212 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family) 1213 { 1214 switch (family){ 1215 case AF_INET: 1216 return (xfrm_address_t *)&fl->u.ip4.daddr; 1217 case AF_INET6: 1218 return (xfrm_address_t *)&fl->u.ip6.daddr; 1219 } 1220 return NULL; 1221 } 1222 1223 static __inline__ 1224 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family) 1225 { 1226 switch (family){ 1227 case AF_INET: 1228 return (xfrm_address_t *)&fl->u.ip4.saddr; 1229 case AF_INET6: 1230 return (xfrm_address_t *)&fl->u.ip6.saddr; 1231 } 1232 return NULL; 1233 } 1234 1235 static __inline__ 1236 void xfrm_flowi_addr_get(const struct flowi *fl, 1237 xfrm_address_t *saddr, xfrm_address_t *daddr, 1238 unsigned short family) 1239 { 1240 switch(family) { 1241 case AF_INET: 1242 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4)); 1243 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4)); 1244 break; 1245 case AF_INET6: 1246 saddr->in6 = fl->u.ip6.saddr; 1247 daddr->in6 = fl->u.ip6.daddr; 1248 break; 1249 } 1250 } 1251 1252 static __inline__ int 1253 __xfrm4_state_addr_check(const struct xfrm_state *x, 1254 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1255 { 1256 if (daddr->a4 == x->id.daddr.a4 && 1257 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 1258 return 1; 1259 return 0; 1260 } 1261 1262 static __inline__ int 1263 __xfrm6_state_addr_check(const struct xfrm_state *x, 1264 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1265 { 1266 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 1267 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) || 1268 ipv6_addr_any((struct in6_addr *)saddr) || 1269 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 1270 return 1; 1271 return 0; 1272 } 1273 1274 static __inline__ int 1275 xfrm_state_addr_check(const struct xfrm_state *x, 1276 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1277 unsigned short family) 1278 { 1279 switch (family) { 1280 case AF_INET: 1281 return __xfrm4_state_addr_check(x, daddr, saddr); 1282 case AF_INET6: 1283 return __xfrm6_state_addr_check(x, daddr, saddr); 1284 } 1285 return 0; 1286 } 1287 1288 static __inline__ int 1289 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl, 1290 unsigned short family) 1291 { 1292 switch (family) { 1293 case AF_INET: 1294 return __xfrm4_state_addr_check(x, 1295 (const xfrm_address_t *)&fl->u.ip4.daddr, 1296 (const xfrm_address_t *)&fl->u.ip4.saddr); 1297 case AF_INET6: 1298 return __xfrm6_state_addr_check(x, 1299 (const xfrm_address_t *)&fl->u.ip6.daddr, 1300 (const xfrm_address_t *)&fl->u.ip6.saddr); 1301 } 1302 return 0; 1303 } 1304 1305 static inline int xfrm_state_kern(const struct xfrm_state *x) 1306 { 1307 return atomic_read(&x->tunnel_users); 1308 } 1309 1310 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 1311 { 1312 return (!userproto || proto == userproto || 1313 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 1314 proto == IPPROTO_ESP || 1315 proto == IPPROTO_COMP))); 1316 } 1317 1318 /* 1319 * xfrm algorithm information 1320 */ 1321 struct xfrm_algo_aead_info { 1322 char *geniv; 1323 u16 icv_truncbits; 1324 }; 1325 1326 struct xfrm_algo_auth_info { 1327 u16 icv_truncbits; 1328 u16 icv_fullbits; 1329 }; 1330 1331 struct xfrm_algo_encr_info { 1332 char *geniv; 1333 u16 blockbits; 1334 u16 defkeybits; 1335 }; 1336 1337 struct xfrm_algo_comp_info { 1338 u16 threshold; 1339 }; 1340 1341 struct xfrm_algo_desc { 1342 char *name; 1343 char *compat; 1344 u8 available:1; 1345 u8 pfkey_supported:1; 1346 union { 1347 struct xfrm_algo_aead_info aead; 1348 struct xfrm_algo_auth_info auth; 1349 struct xfrm_algo_encr_info encr; 1350 struct xfrm_algo_comp_info comp; 1351 } uinfo; 1352 struct sadb_alg desc; 1353 }; 1354 1355 /* XFRM protocol handlers. */ 1356 struct xfrm4_protocol { 1357 int (*handler)(struct sk_buff *skb); 1358 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1359 int encap_type); 1360 int (*cb_handler)(struct sk_buff *skb, int err); 1361 int (*err_handler)(struct sk_buff *skb, u32 info); 1362 1363 struct xfrm4_protocol __rcu *next; 1364 int priority; 1365 }; 1366 1367 struct xfrm6_protocol { 1368 int (*handler)(struct sk_buff *skb); 1369 int (*cb_handler)(struct sk_buff *skb, int err); 1370 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1371 u8 type, u8 code, int offset, __be32 info); 1372 1373 struct xfrm6_protocol __rcu *next; 1374 int priority; 1375 }; 1376 1377 /* XFRM tunnel handlers. */ 1378 struct xfrm_tunnel { 1379 int (*handler)(struct sk_buff *skb); 1380 int (*err_handler)(struct sk_buff *skb, u32 info); 1381 1382 struct xfrm_tunnel __rcu *next; 1383 int priority; 1384 }; 1385 1386 struct xfrm6_tunnel { 1387 int (*handler)(struct sk_buff *skb); 1388 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1389 u8 type, u8 code, int offset, __be32 info); 1390 struct xfrm6_tunnel __rcu *next; 1391 int priority; 1392 }; 1393 1394 void xfrm_init(void); 1395 void xfrm4_init(void); 1396 int xfrm_state_init(struct net *net); 1397 void xfrm_state_fini(struct net *net); 1398 void xfrm4_state_init(void); 1399 void xfrm4_protocol_init(void); 1400 #ifdef CONFIG_XFRM 1401 int xfrm6_init(void); 1402 void xfrm6_fini(void); 1403 int xfrm6_state_init(void); 1404 void xfrm6_state_fini(void); 1405 int xfrm6_protocol_init(void); 1406 void xfrm6_protocol_fini(void); 1407 #else 1408 static inline int xfrm6_init(void) 1409 { 1410 return 0; 1411 } 1412 static inline void xfrm6_fini(void) 1413 { 1414 ; 1415 } 1416 #endif 1417 1418 #ifdef CONFIG_XFRM_STATISTICS 1419 int xfrm_proc_init(struct net *net); 1420 void xfrm_proc_fini(struct net *net); 1421 #endif 1422 1423 int xfrm_sysctl_init(struct net *net); 1424 #ifdef CONFIG_SYSCTL 1425 void xfrm_sysctl_fini(struct net *net); 1426 #else 1427 static inline void xfrm_sysctl_fini(struct net *net) 1428 { 1429 } 1430 #endif 1431 1432 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 1433 struct xfrm_address_filter *filter); 1434 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1435 int (*func)(struct xfrm_state *, int, void*), void *); 1436 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net); 1437 struct xfrm_state *xfrm_state_alloc(struct net *net); 1438 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr, 1439 const xfrm_address_t *saddr, 1440 const struct flowi *fl, 1441 struct xfrm_tmpl *tmpl, 1442 struct xfrm_policy *pol, int *err, 1443 unsigned short family); 1444 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, 1445 xfrm_address_t *daddr, 1446 xfrm_address_t *saddr, 1447 unsigned short family, 1448 u8 mode, u8 proto, u32 reqid); 1449 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1450 unsigned short family); 1451 int xfrm_state_check_expire(struct xfrm_state *x); 1452 void xfrm_state_insert(struct xfrm_state *x); 1453 int xfrm_state_add(struct xfrm_state *x); 1454 int xfrm_state_update(struct xfrm_state *x); 1455 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark, 1456 const xfrm_address_t *daddr, __be32 spi, 1457 u8 proto, unsigned short family); 1458 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1459 const xfrm_address_t *daddr, 1460 const xfrm_address_t *saddr, 1461 u8 proto, 1462 unsigned short family); 1463 #ifdef CONFIG_XFRM_SUB_POLICY 1464 int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1465 unsigned short family, struct net *net); 1466 int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1467 unsigned short family); 1468 #else 1469 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 1470 int n, unsigned short family, struct net *net) 1471 { 1472 return -ENOSYS; 1473 } 1474 1475 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 1476 int n, unsigned short family) 1477 { 1478 return -ENOSYS; 1479 } 1480 #endif 1481 1482 struct xfrmk_sadinfo { 1483 u32 sadhcnt; /* current hash bkts */ 1484 u32 sadhmcnt; /* max allowed hash bkts */ 1485 u32 sadcnt; /* current running count */ 1486 }; 1487 1488 struct xfrmk_spdinfo { 1489 u32 incnt; 1490 u32 outcnt; 1491 u32 fwdcnt; 1492 u32 inscnt; 1493 u32 outscnt; 1494 u32 fwdscnt; 1495 u32 spdhcnt; 1496 u32 spdhmcnt; 1497 }; 1498 1499 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1500 int xfrm_state_delete(struct xfrm_state *x); 1501 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid); 1502 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); 1503 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); 1504 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq); 1505 int xfrm_init_replay(struct xfrm_state *x); 1506 int xfrm_state_mtu(struct xfrm_state *x, int mtu); 1507 int __xfrm_init_state(struct xfrm_state *x, bool init_replay); 1508 int xfrm_init_state(struct xfrm_state *x); 1509 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb); 1510 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type); 1511 int xfrm_input_resume(struct sk_buff *skb, int nexthdr); 1512 int xfrm_output_resume(struct sk_buff *skb, int err); 1513 int xfrm_output(struct sock *sk, struct sk_buff *skb); 1514 int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1515 void xfrm_local_error(struct sk_buff *skb, int mtu); 1516 int xfrm4_extract_header(struct sk_buff *skb); 1517 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1518 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1519 int encap_type); 1520 int xfrm4_transport_finish(struct sk_buff *skb, int async); 1521 int xfrm4_rcv(struct sk_buff *skb); 1522 1523 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1524 { 1525 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL; 1526 XFRM_SPI_SKB_CB(skb)->family = AF_INET; 1527 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); 1528 return xfrm_input(skb, nexthdr, spi, 0); 1529 } 1530 1531 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1532 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb); 1533 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1534 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb); 1535 int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err); 1536 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol); 1537 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol); 1538 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1539 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1540 void xfrm4_local_error(struct sk_buff *skb, u32 mtu); 1541 int xfrm6_extract_header(struct sk_buff *skb); 1542 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1543 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi, 1544 struct ip6_tnl *t); 1545 int xfrm6_transport_finish(struct sk_buff *skb, int async); 1546 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t); 1547 int xfrm6_rcv(struct sk_buff *skb); 1548 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1549 xfrm_address_t *saddr, u8 proto); 1550 void xfrm6_local_error(struct sk_buff *skb, u32 mtu); 1551 int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err); 1552 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol); 1553 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol); 1554 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1555 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1556 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr); 1557 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr); 1558 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1559 int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb); 1560 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1561 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb); 1562 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, 1563 u8 **prevhdr); 1564 1565 #ifdef CONFIG_XFRM 1566 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1567 int xfrm_user_policy(struct sock *sk, int optname, 1568 u8 __user *optval, int optlen); 1569 #else 1570 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 1571 { 1572 return -ENOPROTOOPT; 1573 } 1574 1575 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb) 1576 { 1577 /* should not happen */ 1578 kfree_skb(skb); 1579 return 0; 1580 } 1581 #endif 1582 1583 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); 1584 1585 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); 1586 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, 1587 int (*func)(struct xfrm_policy *, int, int, void*), 1588 void *); 1589 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net); 1590 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1591 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, 1592 u8 type, int dir, 1593 struct xfrm_selector *sel, 1594 struct xfrm_sec_ctx *ctx, int delete, 1595 int *err); 1596 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, 1597 u32 id, int delete, int *err); 1598 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid); 1599 void xfrm_policy_hash_rebuild(struct net *net); 1600 u32 xfrm_get_acqseq(void); 1601 int verify_spi_info(u8 proto, u32 min, u32 max); 1602 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 1603 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, 1604 u8 mode, u32 reqid, u8 proto, 1605 const xfrm_address_t *daddr, 1606 const xfrm_address_t *saddr, int create, 1607 unsigned short family); 1608 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1609 1610 #ifdef CONFIG_XFRM_MIGRATE 1611 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1612 const struct xfrm_migrate *m, int num_bundles, 1613 const struct xfrm_kmaddress *k); 1614 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net); 1615 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 1616 struct xfrm_migrate *m); 1617 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1618 struct xfrm_migrate *m, int num_bundles, 1619 struct xfrm_kmaddress *k, struct net *net); 1620 #endif 1621 1622 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1623 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid); 1624 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, 1625 xfrm_address_t *addr); 1626 1627 void xfrm_input_init(void); 1628 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1629 1630 void xfrm_probe_algs(void); 1631 int xfrm_count_pfkey_auth_supported(void); 1632 int xfrm_count_pfkey_enc_supported(void); 1633 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1634 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1635 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1636 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1637 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1638 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe); 1639 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe); 1640 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe); 1641 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, 1642 int probe); 1643 1644 static inline bool xfrm6_addr_equal(const xfrm_address_t *a, 1645 const xfrm_address_t *b) 1646 { 1647 return ipv6_addr_equal((const struct in6_addr *)a, 1648 (const struct in6_addr *)b); 1649 } 1650 1651 static inline bool xfrm_addr_equal(const xfrm_address_t *a, 1652 const xfrm_address_t *b, 1653 sa_family_t family) 1654 { 1655 switch (family) { 1656 default: 1657 case AF_INET: 1658 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0; 1659 case AF_INET6: 1660 return xfrm6_addr_equal(a, b); 1661 } 1662 } 1663 1664 static inline int xfrm_policy_id2dir(u32 index) 1665 { 1666 return index & 7; 1667 } 1668 1669 #ifdef CONFIG_XFRM 1670 static inline int xfrm_aevent_is_on(struct net *net) 1671 { 1672 struct sock *nlsk; 1673 int ret = 0; 1674 1675 rcu_read_lock(); 1676 nlsk = rcu_dereference(net->xfrm.nlsk); 1677 if (nlsk) 1678 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1679 rcu_read_unlock(); 1680 return ret; 1681 } 1682 1683 static inline int xfrm_acquire_is_on(struct net *net) 1684 { 1685 struct sock *nlsk; 1686 int ret = 0; 1687 1688 rcu_read_lock(); 1689 nlsk = rcu_dereference(net->xfrm.nlsk); 1690 if (nlsk) 1691 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE); 1692 rcu_read_unlock(); 1693 1694 return ret; 1695 } 1696 #endif 1697 1698 static inline int aead_len(struct xfrm_algo_aead *alg) 1699 { 1700 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1701 } 1702 1703 static inline int xfrm_alg_len(const struct xfrm_algo *alg) 1704 { 1705 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1706 } 1707 1708 static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg) 1709 { 1710 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1711 } 1712 1713 static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn) 1714 { 1715 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32); 1716 } 1717 1718 #ifdef CONFIG_XFRM_MIGRATE 1719 static inline int xfrm_replay_clone(struct xfrm_state *x, 1720 struct xfrm_state *orig) 1721 { 1722 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn), 1723 GFP_KERNEL); 1724 if (!x->replay_esn) 1725 return -ENOMEM; 1726 1727 x->replay_esn->bmp_len = orig->replay_esn->bmp_len; 1728 x->replay_esn->replay_window = orig->replay_esn->replay_window; 1729 1730 x->preplay_esn = kmemdup(x->replay_esn, 1731 xfrm_replay_state_esn_len(x->replay_esn), 1732 GFP_KERNEL); 1733 if (!x->preplay_esn) { 1734 kfree(x->replay_esn); 1735 return -ENOMEM; 1736 } 1737 1738 return 0; 1739 } 1740 1741 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig) 1742 { 1743 return kmemdup(orig, aead_len(orig), GFP_KERNEL); 1744 } 1745 1746 1747 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1748 { 1749 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); 1750 } 1751 1752 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig) 1753 { 1754 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL); 1755 } 1756 1757 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1758 { 1759 int i; 1760 for (i = 0; i < n; i++) 1761 xfrm_state_put(*(states + i)); 1762 } 1763 1764 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1765 { 1766 int i; 1767 for (i = 0; i < n; i++) 1768 xfrm_state_delete(*(states + i)); 1769 } 1770 #endif 1771 1772 #ifdef CONFIG_XFRM 1773 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) 1774 { 1775 return skb->sp->xvec[skb->sp->len - 1]; 1776 } 1777 #endif 1778 1779 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) 1780 { 1781 if (attrs[XFRMA_MARK]) 1782 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark)); 1783 else 1784 m->v = m->m = 0; 1785 1786 return m->v & m->m; 1787 } 1788 1789 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m) 1790 { 1791 int ret = 0; 1792 1793 if (m->m | m->v) 1794 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); 1795 return ret; 1796 } 1797 1798 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x, 1799 unsigned int family) 1800 { 1801 bool tunnel = false; 1802 1803 switch(family) { 1804 case AF_INET: 1805 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) 1806 tunnel = true; 1807 break; 1808 case AF_INET6: 1809 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) 1810 tunnel = true; 1811 break; 1812 } 1813 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL)) 1814 return -EINVAL; 1815 1816 return 0; 1817 } 1818 #endif /* _NET_XFRM_H */ 1819