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 57 /* Organization of SPD aka "XFRM rules" 58 ------------------------------------ 59 60 Basic objects: 61 - policy rule, struct xfrm_policy (=SPD entry) 62 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) 63 - instance of a transformer, struct xfrm_state (=SA) 64 - template to clone xfrm_state, struct xfrm_tmpl 65 66 SPD is plain linear list of xfrm_policy rules, ordered by priority. 67 (To be compatible with existing pfkeyv2 implementations, 68 many rules with priority of 0x7fffffff are allowed to exist and 69 such rules are ordered in an unpredictable way, thanks to bsd folks.) 70 71 Lookup is plain linear search until the first match with selector. 72 73 If "action" is "block", then we prohibit the flow, otherwise: 74 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, 75 policy entry has list of up to XFRM_MAX_DEPTH transformations, 76 described by templates xfrm_tmpl. Each template is resolved 77 to a complete xfrm_state (see below) and we pack bundle of transformations 78 to a dst_entry returned to requestor. 79 80 dst -. xfrm .-> xfrm_state #1 81 |---. child .-> dst -. xfrm .-> xfrm_state #2 82 |---. child .-> dst -. xfrm .-> xfrm_state #3 83 |---. child .-> NULL 84 85 Bundles are cached at xrfm_policy struct (field ->bundles). 86 87 88 Resolution of xrfm_tmpl 89 ----------------------- 90 Template contains: 91 1. ->mode Mode: transport or tunnel 92 2. ->id.proto Protocol: AH/ESP/IPCOMP 93 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. 94 Q: allow to resolve security gateway? 95 4. ->id.spi If not zero, static SPI. 96 5. ->saddr Local tunnel endpoint, ignored for transport mode. 97 6. ->algos List of allowed algos. Plain bitmask now. 98 Q: ealgos, aalgos, calgos. What a mess... 99 7. ->share Sharing mode. 100 Q: how to implement private sharing mode? To add struct sock* to 101 flow id? 102 103 Having this template we search through SAD searching for entries 104 with appropriate mode/proto/algo, permitted by selector. 105 If no appropriate entry found, it is requested from key manager. 106 107 PROBLEMS: 108 Q: How to find all the bundles referring to a physical path for 109 PMTU discovery? Seems, dst should contain list of all parents... 110 and enter to infinite locking hierarchy disaster. 111 No! It is easier, we will not search for them, let them find us. 112 We add genid to each dst plus pointer to genid of raw IP route, 113 pmtu disc will update pmtu on raw IP route and increase its genid. 114 dst_check() will see this for top level and trigger resyncing 115 metrics. Plus, it will be made via sk->sk_dst_cache. Solved. 116 */ 117 118 struct xfrm_state_walk { 119 struct list_head all; 120 u8 state; 121 u8 dying; 122 u8 proto; 123 u32 seq; 124 struct xfrm_address_filter *filter; 125 }; 126 127 /* Full description of state of transformer. */ 128 struct xfrm_state { 129 #ifdef CONFIG_NET_NS 130 struct net *xs_net; 131 #endif 132 union { 133 struct hlist_node gclist; 134 struct hlist_node bydst; 135 }; 136 struct hlist_node bysrc; 137 struct hlist_node byspi; 138 139 atomic_t refcnt; 140 spinlock_t lock; 141 142 struct xfrm_id id; 143 struct xfrm_selector sel; 144 struct xfrm_mark mark; 145 u32 tfcpad; 146 147 u32 genid; 148 149 /* Key manager bits */ 150 struct xfrm_state_walk km; 151 152 /* Parameters of this state. */ 153 struct { 154 u32 reqid; 155 u8 mode; 156 u8 replay_window; 157 u8 aalgo, ealgo, calgo; 158 u8 flags; 159 u16 family; 160 xfrm_address_t saddr; 161 int header_len; 162 int trailer_len; 163 u32 extra_flags; 164 } props; 165 166 struct xfrm_lifetime_cfg lft; 167 168 /* Data for transformer */ 169 struct xfrm_algo_auth *aalg; 170 struct xfrm_algo *ealg; 171 struct xfrm_algo *calg; 172 struct xfrm_algo_aead *aead; 173 174 /* Data for encapsulator */ 175 struct xfrm_encap_tmpl *encap; 176 177 /* Data for care-of address */ 178 xfrm_address_t *coaddr; 179 180 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 181 struct xfrm_state *tunnel; 182 183 /* If a tunnel, number of users + 1 */ 184 atomic_t tunnel_users; 185 186 /* State for replay detection */ 187 struct xfrm_replay_state replay; 188 struct xfrm_replay_state_esn *replay_esn; 189 190 /* Replay detection state at the time we sent the last notification */ 191 struct xfrm_replay_state preplay; 192 struct xfrm_replay_state_esn *preplay_esn; 193 194 /* The functions for replay detection. */ 195 struct xfrm_replay *repl; 196 197 /* internal flag that only holds state for delayed aevent at the 198 * moment 199 */ 200 u32 xflags; 201 202 /* Replay detection notification settings */ 203 u32 replay_maxage; 204 u32 replay_maxdiff; 205 206 /* Replay detection notification timer */ 207 struct timer_list rtimer; 208 209 /* Statistics */ 210 struct xfrm_stats stats; 211 212 struct xfrm_lifetime_cur curlft; 213 struct tasklet_hrtimer mtimer; 214 215 /* used to fix curlft->add_time when changing date */ 216 long saved_tmo; 217 218 /* Last used time */ 219 unsigned long lastused; 220 221 /* Reference to data common to all the instances of this 222 * transformer. */ 223 const struct xfrm_type *type; 224 struct xfrm_mode *inner_mode; 225 struct xfrm_mode *inner_mode_iaf; 226 struct xfrm_mode *outer_mode; 227 228 /* Security context */ 229 struct xfrm_sec_ctx *security; 230 231 /* Private data of this transformer, format is opaque, 232 * interpreted by xfrm_type methods. */ 233 void *data; 234 }; 235 236 static inline struct net *xs_net(struct xfrm_state *x) 237 { 238 return read_pnet(&x->xs_net); 239 } 240 241 /* xflags - make enum if more show up */ 242 #define XFRM_TIME_DEFER 1 243 #define XFRM_SOFT_EXPIRE 2 244 245 enum { 246 XFRM_STATE_VOID, 247 XFRM_STATE_ACQ, 248 XFRM_STATE_VALID, 249 XFRM_STATE_ERROR, 250 XFRM_STATE_EXPIRED, 251 XFRM_STATE_DEAD 252 }; 253 254 /* callback structure passed from either netlink or pfkey */ 255 struct km_event { 256 union { 257 u32 hard; 258 u32 proto; 259 u32 byid; 260 u32 aevent; 261 u32 type; 262 } data; 263 264 u32 seq; 265 u32 portid; 266 u32 event; 267 struct net *net; 268 }; 269 270 struct xfrm_replay { 271 void (*advance)(struct xfrm_state *x, __be32 net_seq); 272 int (*check)(struct xfrm_state *x, 273 struct sk_buff *skb, 274 __be32 net_seq); 275 int (*recheck)(struct xfrm_state *x, 276 struct sk_buff *skb, 277 __be32 net_seq); 278 void (*notify)(struct xfrm_state *x, int event); 279 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb); 280 }; 281 282 struct net_device; 283 struct xfrm_type; 284 struct xfrm_dst; 285 struct xfrm_policy_afinfo { 286 unsigned short family; 287 struct dst_ops *dst_ops; 288 void (*garbage_collect)(struct net *net); 289 struct dst_entry *(*dst_lookup)(struct net *net, int tos, 290 const xfrm_address_t *saddr, 291 const xfrm_address_t *daddr); 292 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr); 293 void (*decode_session)(struct sk_buff *skb, 294 struct flowi *fl, 295 int reverse); 296 int (*get_tos)(const struct flowi *fl); 297 void (*init_dst)(struct net *net, 298 struct xfrm_dst *dst); 299 int (*init_path)(struct xfrm_dst *path, 300 struct dst_entry *dst, 301 int nfheader_len); 302 int (*fill_dst)(struct xfrm_dst *xdst, 303 struct net_device *dev, 304 const struct flowi *fl); 305 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig); 306 }; 307 308 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); 309 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); 310 void km_policy_notify(struct xfrm_policy *xp, int dir, 311 const struct km_event *c); 312 void km_state_notify(struct xfrm_state *x, const struct km_event *c); 313 314 struct xfrm_tmpl; 315 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, 316 struct xfrm_policy *pol); 317 void km_state_expired(struct xfrm_state *x, int hard, u32 portid); 318 int __xfrm_state_delete(struct xfrm_state *x); 319 320 struct xfrm_state_afinfo { 321 unsigned int family; 322 unsigned int proto; 323 __be16 eth_proto; 324 struct module *owner; 325 const struct xfrm_type *type_map[IPPROTO_MAX]; 326 struct xfrm_mode *mode_map[XFRM_MODE_MAX]; 327 int (*init_flags)(struct xfrm_state *x); 328 void (*init_tempsel)(struct xfrm_selector *sel, 329 const struct flowi *fl); 330 void (*init_temprop)(struct xfrm_state *x, 331 const struct xfrm_tmpl *tmpl, 332 const xfrm_address_t *daddr, 333 const xfrm_address_t *saddr); 334 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n); 335 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n); 336 int (*output)(struct sock *sk, struct sk_buff *skb); 337 int (*output_finish)(struct sk_buff *skb); 338 int (*extract_input)(struct xfrm_state *x, 339 struct sk_buff *skb); 340 int (*extract_output)(struct xfrm_state *x, 341 struct sk_buff *skb); 342 int (*transport_finish)(struct sk_buff *skb, 343 int async); 344 void (*local_error)(struct sk_buff *skb, u32 mtu); 345 }; 346 347 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 348 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 349 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); 350 void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); 351 352 struct xfrm_input_afinfo { 353 unsigned int family; 354 struct module *owner; 355 int (*callback)(struct sk_buff *skb, u8 protocol, 356 int err); 357 }; 358 359 int xfrm_input_register_afinfo(struct xfrm_input_afinfo *afinfo); 360 int xfrm_input_unregister_afinfo(struct xfrm_input_afinfo *afinfo); 361 362 void xfrm_state_delete_tunnel(struct xfrm_state *x); 363 364 struct xfrm_type { 365 char *description; 366 struct module *owner; 367 u8 proto; 368 u8 flags; 369 #define XFRM_TYPE_NON_FRAGMENT 1 370 #define XFRM_TYPE_REPLAY_PROT 2 371 #define XFRM_TYPE_LOCAL_COADDR 4 372 #define XFRM_TYPE_REMOTE_COADDR 8 373 374 int (*init_state)(struct xfrm_state *x); 375 void (*destructor)(struct xfrm_state *); 376 int (*input)(struct xfrm_state *, struct sk_buff *skb); 377 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 378 int (*reject)(struct xfrm_state *, struct sk_buff *, 379 const struct flowi *); 380 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **); 381 /* Estimate maximal size of result of transformation of a dgram */ 382 u32 (*get_mtu)(struct xfrm_state *, int size); 383 }; 384 385 int xfrm_register_type(const struct xfrm_type *type, unsigned short family); 386 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); 387 388 struct xfrm_mode { 389 /* 390 * Remove encapsulation header. 391 * 392 * The IP header will be moved over the top of the encapsulation 393 * header. 394 * 395 * On entry, the transport header shall point to where the IP header 396 * should be and the network header shall be set to where the IP 397 * header currently is. skb->data shall point to the start of the 398 * payload. 399 */ 400 int (*input2)(struct xfrm_state *x, struct sk_buff *skb); 401 402 /* 403 * This is the actual input entry point. 404 * 405 * For transport mode and equivalent this would be identical to 406 * input2 (which does not need to be set). While tunnel mode 407 * and equivalent would set this to the tunnel encapsulation function 408 * xfrm4_prepare_input that would in turn call input2. 409 */ 410 int (*input)(struct xfrm_state *x, struct sk_buff *skb); 411 412 /* 413 * Add encapsulation header. 414 * 415 * On exit, the transport header will be set to the start of the 416 * encapsulation header to be filled in by x->type->output and 417 * the mac header will be set to the nextheader (protocol for 418 * IPv4) field of the extension header directly preceding the 419 * encapsulation header, or in its absence, that of the top IP 420 * header. The value of the network header will always point 421 * to the top IP header while skb->data will point to the payload. 422 */ 423 int (*output2)(struct xfrm_state *x,struct sk_buff *skb); 424 425 /* 426 * This is the actual output entry point. 427 * 428 * For transport mode and equivalent this would be identical to 429 * output2 (which does not need to be set). While tunnel mode 430 * and equivalent would set this to a tunnel encapsulation function 431 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn 432 * call output2. 433 */ 434 int (*output)(struct xfrm_state *x, struct sk_buff *skb); 435 436 struct xfrm_state_afinfo *afinfo; 437 struct module *owner; 438 unsigned int encap; 439 int flags; 440 }; 441 442 /* Flags for xfrm_mode. */ 443 enum { 444 XFRM_MODE_FLAG_TUNNEL = 1, 445 }; 446 447 int xfrm_register_mode(struct xfrm_mode *mode, int family); 448 int xfrm_unregister_mode(struct xfrm_mode *mode, int family); 449 450 static inline int xfrm_af2proto(unsigned int family) 451 { 452 switch(family) { 453 case AF_INET: 454 return IPPROTO_IPIP; 455 case AF_INET6: 456 return IPPROTO_IPV6; 457 default: 458 return 0; 459 } 460 } 461 462 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto) 463 { 464 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) || 465 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6)) 466 return x->inner_mode; 467 else 468 return x->inner_mode_iaf; 469 } 470 471 struct xfrm_tmpl { 472 /* id in template is interpreted as: 473 * daddr - destination of tunnel, may be zero for transport mode. 474 * spi - zero to acquire spi. Not zero if spi is static, then 475 * daddr must be fixed too. 476 * proto - AH/ESP/IPCOMP 477 */ 478 struct xfrm_id id; 479 480 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 481 xfrm_address_t saddr; 482 483 unsigned short encap_family; 484 485 u32 reqid; 486 487 /* Mode: transport, tunnel etc. */ 488 u8 mode; 489 490 /* Sharing mode: unique, this session only, this user only etc. */ 491 u8 share; 492 493 /* May skip this transfomration if no SA is found */ 494 u8 optional; 495 496 /* Skip aalgos/ealgos/calgos checks. */ 497 u8 allalgs; 498 499 /* Bit mask of algos allowed for acquisition */ 500 u32 aalgos; 501 u32 ealgos; 502 u32 calgos; 503 }; 504 505 #define XFRM_MAX_DEPTH 6 506 507 struct xfrm_policy_walk_entry { 508 struct list_head all; 509 u8 dead; 510 }; 511 512 struct xfrm_policy_walk { 513 struct xfrm_policy_walk_entry walk; 514 u8 type; 515 u32 seq; 516 }; 517 518 struct xfrm_policy_queue { 519 struct sk_buff_head hold_queue; 520 struct timer_list hold_timer; 521 unsigned long timeout; 522 }; 523 524 struct xfrm_policy { 525 #ifdef CONFIG_NET_NS 526 struct net *xp_net; 527 #endif 528 struct hlist_node bydst; 529 struct hlist_node byidx; 530 531 /* This lock only affects elements except for entry. */ 532 rwlock_t lock; 533 atomic_t refcnt; 534 struct timer_list timer; 535 536 struct flow_cache_object flo; 537 atomic_t genid; 538 u32 priority; 539 u32 index; 540 struct xfrm_mark mark; 541 struct xfrm_selector selector; 542 struct xfrm_lifetime_cfg lft; 543 struct xfrm_lifetime_cur curlft; 544 struct xfrm_policy_walk_entry walk; 545 struct xfrm_policy_queue polq; 546 u8 type; 547 u8 action; 548 u8 flags; 549 u8 xfrm_nr; 550 u16 family; 551 struct xfrm_sec_ctx *security; 552 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 553 }; 554 555 static inline struct net *xp_net(const struct xfrm_policy *xp) 556 { 557 return read_pnet(&xp->xp_net); 558 } 559 560 struct xfrm_kmaddress { 561 xfrm_address_t local; 562 xfrm_address_t remote; 563 u32 reserved; 564 u16 family; 565 }; 566 567 struct xfrm_migrate { 568 xfrm_address_t old_daddr; 569 xfrm_address_t old_saddr; 570 xfrm_address_t new_daddr; 571 xfrm_address_t new_saddr; 572 u8 proto; 573 u8 mode; 574 u16 reserved; 575 u32 reqid; 576 u16 old_family; 577 u16 new_family; 578 }; 579 580 #define XFRM_KM_TIMEOUT 30 581 /* what happened */ 582 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 583 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 584 585 /* default aevent timeout in units of 100ms */ 586 #define XFRM_AE_ETIME 10 587 /* Async Event timer multiplier */ 588 #define XFRM_AE_ETH_M 10 589 /* default seq threshold size */ 590 #define XFRM_AE_SEQT_SIZE 2 591 592 struct xfrm_mgr { 593 struct list_head list; 594 char *id; 595 int (*notify)(struct xfrm_state *x, const struct km_event *c); 596 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp); 597 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 598 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 599 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c); 600 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 601 int (*migrate)(const struct xfrm_selector *sel, 602 u8 dir, u8 type, 603 const struct xfrm_migrate *m, 604 int num_bundles, 605 const struct xfrm_kmaddress *k); 606 bool (*is_alive)(const struct km_event *c); 607 }; 608 609 int xfrm_register_km(struct xfrm_mgr *km); 610 int xfrm_unregister_km(struct xfrm_mgr *km); 611 612 struct xfrm_tunnel_skb_cb { 613 union { 614 struct inet_skb_parm h4; 615 struct inet6_skb_parm h6; 616 } header; 617 618 union { 619 struct ip_tunnel *ip4; 620 struct ip6_tnl *ip6; 621 } tunnel; 622 }; 623 624 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0])) 625 626 /* 627 * This structure is used for the duration where packets are being 628 * transformed by IPsec. As soon as the packet leaves IPsec the 629 * area beyond the generic IP part may be overwritten. 630 */ 631 struct xfrm_skb_cb { 632 struct xfrm_tunnel_skb_cb header; 633 634 /* Sequence number for replay protection. */ 635 union { 636 struct { 637 __u32 low; 638 __u32 hi; 639 } output; 640 struct { 641 __be32 low; 642 __be32 hi; 643 } input; 644 } seq; 645 }; 646 647 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) 648 649 /* 650 * This structure is used by the afinfo prepare_input/prepare_output functions 651 * to transmit header information to the mode input/output functions. 652 */ 653 struct xfrm_mode_skb_cb { 654 struct xfrm_tunnel_skb_cb header; 655 656 /* Copied from header for IPv4, always set to zero and DF for IPv6. */ 657 __be16 id; 658 __be16 frag_off; 659 660 /* IP header length (excluding options or extension headers). */ 661 u8 ihl; 662 663 /* TOS for IPv4, class for IPv6. */ 664 u8 tos; 665 666 /* TTL for IPv4, hop limitfor IPv6. */ 667 u8 ttl; 668 669 /* Protocol for IPv4, NH for IPv6. */ 670 u8 protocol; 671 672 /* Option length for IPv4, zero for IPv6. */ 673 u8 optlen; 674 675 /* Used by IPv6 only, zero for IPv4. */ 676 u8 flow_lbl[3]; 677 }; 678 679 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0])) 680 681 /* 682 * This structure is used by the input processing to locate the SPI and 683 * related information. 684 */ 685 struct xfrm_spi_skb_cb { 686 struct xfrm_tunnel_skb_cb header; 687 688 unsigned int daddroff; 689 unsigned int family; 690 }; 691 692 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0])) 693 694 #ifdef CONFIG_AUDITSYSCALL 695 static inline struct audit_buffer *xfrm_audit_start(const char *op) 696 { 697 struct audit_buffer *audit_buf = NULL; 698 699 if (audit_enabled == 0) 700 return NULL; 701 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, 702 AUDIT_MAC_IPSEC_EVENT); 703 if (audit_buf == NULL) 704 return NULL; 705 audit_log_format(audit_buf, "op=%s", op); 706 return audit_buf; 707 } 708 709 static inline void xfrm_audit_helper_usrinfo(bool task_valid, 710 struct audit_buffer *audit_buf) 711 { 712 const unsigned int auid = from_kuid(&init_user_ns, task_valid ? 713 audit_get_loginuid(current) : 714 INVALID_UID); 715 const unsigned int ses = task_valid ? audit_get_sessionid(current) : 716 (unsigned int) -1; 717 718 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses); 719 audit_log_task_context(audit_buf); 720 } 721 722 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid); 723 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 724 bool task_valid); 725 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid); 726 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid); 727 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 728 struct sk_buff *skb); 729 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb, 730 __be32 net_seq); 731 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family); 732 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi, 733 __be32 net_seq); 734 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb, 735 u8 proto); 736 #else 737 738 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 739 bool task_valid) 740 { 741 } 742 743 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 744 bool task_valid) 745 { 746 } 747 748 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result, 749 bool task_valid) 750 { 751 } 752 753 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result, 754 bool task_valid) 755 { 756 } 757 758 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 759 struct sk_buff *skb) 760 { 761 } 762 763 static inline void xfrm_audit_state_replay(struct xfrm_state *x, 764 struct sk_buff *skb, __be32 net_seq) 765 { 766 } 767 768 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb, 769 u16 family) 770 { 771 } 772 773 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 774 __be32 net_spi, __be32 net_seq) 775 { 776 } 777 778 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x, 779 struct sk_buff *skb, u8 proto) 780 { 781 } 782 #endif /* CONFIG_AUDITSYSCALL */ 783 784 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 785 { 786 if (likely(policy != NULL)) 787 atomic_inc(&policy->refcnt); 788 } 789 790 void xfrm_policy_destroy(struct xfrm_policy *policy); 791 792 static inline void xfrm_pol_put(struct xfrm_policy *policy) 793 { 794 if (atomic_dec_and_test(&policy->refcnt)) 795 xfrm_policy_destroy(policy); 796 } 797 798 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 799 { 800 int i; 801 for (i = npols - 1; i >= 0; --i) 802 xfrm_pol_put(pols[i]); 803 } 804 805 void __xfrm_state_destroy(struct xfrm_state *); 806 807 static inline void __xfrm_state_put(struct xfrm_state *x) 808 { 809 atomic_dec(&x->refcnt); 810 } 811 812 static inline void xfrm_state_put(struct xfrm_state *x) 813 { 814 if (atomic_dec_and_test(&x->refcnt)) 815 __xfrm_state_destroy(x); 816 } 817 818 static inline void xfrm_state_hold(struct xfrm_state *x) 819 { 820 atomic_inc(&x->refcnt); 821 } 822 823 static inline bool addr_match(const void *token1, const void *token2, 824 int prefixlen) 825 { 826 const __be32 *a1 = token1; 827 const __be32 *a2 = token2; 828 int pdw; 829 int pbi; 830 831 pdw = prefixlen >> 5; /* num of whole u32 in prefix */ 832 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 833 834 if (pdw) 835 if (memcmp(a1, a2, pdw << 2)) 836 return false; 837 838 if (pbi) { 839 __be32 mask; 840 841 mask = htonl((0xffffffff) << (32 - pbi)); 842 843 if ((a1[pdw] ^ a2[pdw]) & mask) 844 return false; 845 } 846 847 return true; 848 } 849 850 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen) 851 { 852 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */ 853 if (prefixlen == 0) 854 return true; 855 return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen))); 856 } 857 858 static __inline__ 859 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli) 860 { 861 __be16 port; 862 switch(fl->flowi_proto) { 863 case IPPROTO_TCP: 864 case IPPROTO_UDP: 865 case IPPROTO_UDPLITE: 866 case IPPROTO_SCTP: 867 port = uli->ports.sport; 868 break; 869 case IPPROTO_ICMP: 870 case IPPROTO_ICMPV6: 871 port = htons(uli->icmpt.type); 872 break; 873 case IPPROTO_MH: 874 port = htons(uli->mht.type); 875 break; 876 case IPPROTO_GRE: 877 port = htons(ntohl(uli->gre_key) >> 16); 878 break; 879 default: 880 port = 0; /*XXX*/ 881 } 882 return port; 883 } 884 885 static __inline__ 886 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli) 887 { 888 __be16 port; 889 switch(fl->flowi_proto) { 890 case IPPROTO_TCP: 891 case IPPROTO_UDP: 892 case IPPROTO_UDPLITE: 893 case IPPROTO_SCTP: 894 port = uli->ports.dport; 895 break; 896 case IPPROTO_ICMP: 897 case IPPROTO_ICMPV6: 898 port = htons(uli->icmpt.code); 899 break; 900 case IPPROTO_GRE: 901 port = htons(ntohl(uli->gre_key) & 0xffff); 902 break; 903 default: 904 port = 0; /*XXX*/ 905 } 906 return port; 907 } 908 909 bool xfrm_selector_match(const struct xfrm_selector *sel, 910 const struct flowi *fl, unsigned short family); 911 912 #ifdef CONFIG_SECURITY_NETWORK_XFRM 913 /* If neither has a context --> match 914 * Otherwise, both must have a context and the sids, doi, alg must match 915 */ 916 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 917 { 918 return ((!s1 && !s2) || 919 (s1 && s2 && 920 (s1->ctx_sid == s2->ctx_sid) && 921 (s1->ctx_doi == s2->ctx_doi) && 922 (s1->ctx_alg == s2->ctx_alg))); 923 } 924 #else 925 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 926 { 927 return true; 928 } 929 #endif 930 931 /* A struct encoding bundle of transformations to apply to some set of flow. 932 * 933 * dst->child points to the next element of bundle. 934 * dst->xfrm points to an instanse of transformer. 935 * 936 * Due to unfortunate limitations of current routing cache, which we 937 * have no time to fix, it mirrors struct rtable and bound to the same 938 * routing key, including saddr,daddr. However, we can have many of 939 * bundles differing by session id. All the bundles grow from a parent 940 * policy rule. 941 */ 942 struct xfrm_dst { 943 union { 944 struct dst_entry dst; 945 struct rtable rt; 946 struct rt6_info rt6; 947 } u; 948 struct dst_entry *route; 949 struct flow_cache_object flo; 950 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; 951 int num_pols, num_xfrms; 952 #ifdef CONFIG_XFRM_SUB_POLICY 953 struct flowi *origin; 954 struct xfrm_selector *partner; 955 #endif 956 u32 xfrm_genid; 957 u32 policy_genid; 958 u32 route_mtu_cached; 959 u32 child_mtu_cached; 960 u32 route_cookie; 961 u32 path_cookie; 962 }; 963 964 #ifdef CONFIG_XFRM 965 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 966 { 967 xfrm_pols_put(xdst->pols, xdst->num_pols); 968 dst_release(xdst->route); 969 if (likely(xdst->u.dst.xfrm)) 970 xfrm_state_put(xdst->u.dst.xfrm); 971 #ifdef CONFIG_XFRM_SUB_POLICY 972 kfree(xdst->origin); 973 xdst->origin = NULL; 974 kfree(xdst->partner); 975 xdst->partner = NULL; 976 #endif 977 } 978 #endif 979 980 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 981 982 struct sec_path { 983 atomic_t refcnt; 984 int len; 985 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 986 }; 987 988 static inline int secpath_exists(struct sk_buff *skb) 989 { 990 #ifdef CONFIG_XFRM 991 return skb->sp != NULL; 992 #else 993 return 0; 994 #endif 995 } 996 997 static inline struct sec_path * 998 secpath_get(struct sec_path *sp) 999 { 1000 if (sp) 1001 atomic_inc(&sp->refcnt); 1002 return sp; 1003 } 1004 1005 void __secpath_destroy(struct sec_path *sp); 1006 1007 static inline void 1008 secpath_put(struct sec_path *sp) 1009 { 1010 if (sp && atomic_dec_and_test(&sp->refcnt)) 1011 __secpath_destroy(sp); 1012 } 1013 1014 struct sec_path *secpath_dup(struct sec_path *src); 1015 1016 static inline void 1017 secpath_reset(struct sk_buff *skb) 1018 { 1019 #ifdef CONFIG_XFRM 1020 secpath_put(skb->sp); 1021 skb->sp = NULL; 1022 #endif 1023 } 1024 1025 static inline int 1026 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family) 1027 { 1028 switch (family) { 1029 case AF_INET: 1030 return addr->a4 == 0; 1031 case AF_INET6: 1032 return ipv6_addr_any((struct in6_addr *)&addr->a6); 1033 } 1034 return 0; 1035 } 1036 1037 static inline int 1038 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1039 { 1040 return (tmpl->saddr.a4 && 1041 tmpl->saddr.a4 != x->props.saddr.a4); 1042 } 1043 1044 static inline int 1045 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1046 { 1047 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 1048 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 1049 } 1050 1051 static inline int 1052 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family) 1053 { 1054 switch (family) { 1055 case AF_INET: 1056 return __xfrm4_state_addr_cmp(tmpl, x); 1057 case AF_INET6: 1058 return __xfrm6_state_addr_cmp(tmpl, x); 1059 } 1060 return !0; 1061 } 1062 1063 #ifdef CONFIG_XFRM 1064 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, 1065 unsigned short family); 1066 1067 static inline int __xfrm_policy_check2(struct sock *sk, int dir, 1068 struct sk_buff *skb, 1069 unsigned int family, int reverse) 1070 { 1071 struct net *net = dev_net(skb->dev); 1072 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); 1073 1074 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 1075 return __xfrm_policy_check(sk, ndir, skb, family); 1076 1077 return (!net->xfrm.policy_count[dir] && !skb->sp) || 1078 (skb_dst(skb)->flags & DST_NOPOLICY) || 1079 __xfrm_policy_check(sk, ndir, skb, family); 1080 } 1081 1082 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1083 { 1084 return __xfrm_policy_check2(sk, dir, skb, family, 0); 1085 } 1086 1087 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1088 { 1089 return xfrm_policy_check(sk, dir, skb, AF_INET); 1090 } 1091 1092 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1093 { 1094 return xfrm_policy_check(sk, dir, skb, AF_INET6); 1095 } 1096 1097 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1098 struct sk_buff *skb) 1099 { 1100 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); 1101 } 1102 1103 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1104 struct sk_buff *skb) 1105 { 1106 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); 1107 } 1108 1109 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1110 unsigned int family, int reverse); 1111 1112 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1113 unsigned int family) 1114 { 1115 return __xfrm_decode_session(skb, fl, family, 0); 1116 } 1117 1118 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1119 struct flowi *fl, 1120 unsigned int family) 1121 { 1122 return __xfrm_decode_session(skb, fl, family, 1); 1123 } 1124 1125 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 1126 1127 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 1128 { 1129 struct net *net = dev_net(skb->dev); 1130 1131 return !net->xfrm.policy_count[XFRM_POLICY_OUT] || 1132 (skb_dst(skb)->flags & DST_NOXFRM) || 1133 __xfrm_route_forward(skb, family); 1134 } 1135 1136 static inline int xfrm4_route_forward(struct sk_buff *skb) 1137 { 1138 return xfrm_route_forward(skb, AF_INET); 1139 } 1140 1141 static inline int xfrm6_route_forward(struct sk_buff *skb) 1142 { 1143 return xfrm_route_forward(skb, AF_INET6); 1144 } 1145 1146 int __xfrm_sk_clone_policy(struct sock *sk); 1147 1148 static inline int xfrm_sk_clone_policy(struct sock *sk) 1149 { 1150 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) 1151 return __xfrm_sk_clone_policy(sk); 1152 return 0; 1153 } 1154 1155 int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 1156 1157 static inline void xfrm_sk_free_policy(struct sock *sk) 1158 { 1159 if (unlikely(sk->sk_policy[0] != NULL)) { 1160 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); 1161 sk->sk_policy[0] = NULL; 1162 } 1163 if (unlikely(sk->sk_policy[1] != NULL)) { 1164 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); 1165 sk->sk_policy[1] = NULL; 1166 } 1167 } 1168 1169 void xfrm_garbage_collect(struct net *net); 1170 1171 #else 1172 1173 static inline void xfrm_sk_free_policy(struct sock *sk) {} 1174 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } 1175 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 1176 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 1177 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1178 { 1179 return 1; 1180 } 1181 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1182 { 1183 return 1; 1184 } 1185 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1186 { 1187 return 1; 1188 } 1189 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1190 struct flowi *fl, 1191 unsigned int family) 1192 { 1193 return -ENOSYS; 1194 } 1195 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1196 struct sk_buff *skb) 1197 { 1198 return 1; 1199 } 1200 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1201 struct sk_buff *skb) 1202 { 1203 return 1; 1204 } 1205 static inline void xfrm_garbage_collect(struct net *net) 1206 { 1207 } 1208 #endif 1209 1210 static __inline__ 1211 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family) 1212 { 1213 switch (family){ 1214 case AF_INET: 1215 return (xfrm_address_t *)&fl->u.ip4.daddr; 1216 case AF_INET6: 1217 return (xfrm_address_t *)&fl->u.ip6.daddr; 1218 } 1219 return NULL; 1220 } 1221 1222 static __inline__ 1223 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family) 1224 { 1225 switch (family){ 1226 case AF_INET: 1227 return (xfrm_address_t *)&fl->u.ip4.saddr; 1228 case AF_INET6: 1229 return (xfrm_address_t *)&fl->u.ip6.saddr; 1230 } 1231 return NULL; 1232 } 1233 1234 static __inline__ 1235 void xfrm_flowi_addr_get(const struct flowi *fl, 1236 xfrm_address_t *saddr, xfrm_address_t *daddr, 1237 unsigned short family) 1238 { 1239 switch(family) { 1240 case AF_INET: 1241 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4)); 1242 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4)); 1243 break; 1244 case AF_INET6: 1245 *(struct in6_addr *)saddr->a6 = fl->u.ip6.saddr; 1246 *(struct in6_addr *)daddr->a6 = fl->u.ip6.daddr; 1247 break; 1248 } 1249 } 1250 1251 static __inline__ int 1252 __xfrm4_state_addr_check(const struct xfrm_state *x, 1253 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1254 { 1255 if (daddr->a4 == x->id.daddr.a4 && 1256 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 1257 return 1; 1258 return 0; 1259 } 1260 1261 static __inline__ int 1262 __xfrm6_state_addr_check(const struct xfrm_state *x, 1263 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1264 { 1265 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 1266 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) || 1267 ipv6_addr_any((struct in6_addr *)saddr) || 1268 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 1269 return 1; 1270 return 0; 1271 } 1272 1273 static __inline__ int 1274 xfrm_state_addr_check(const struct xfrm_state *x, 1275 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1276 unsigned short family) 1277 { 1278 switch (family) { 1279 case AF_INET: 1280 return __xfrm4_state_addr_check(x, daddr, saddr); 1281 case AF_INET6: 1282 return __xfrm6_state_addr_check(x, daddr, saddr); 1283 } 1284 return 0; 1285 } 1286 1287 static __inline__ int 1288 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl, 1289 unsigned short family) 1290 { 1291 switch (family) { 1292 case AF_INET: 1293 return __xfrm4_state_addr_check(x, 1294 (const xfrm_address_t *)&fl->u.ip4.daddr, 1295 (const xfrm_address_t *)&fl->u.ip4.saddr); 1296 case AF_INET6: 1297 return __xfrm6_state_addr_check(x, 1298 (const xfrm_address_t *)&fl->u.ip6.daddr, 1299 (const xfrm_address_t *)&fl->u.ip6.saddr); 1300 } 1301 return 0; 1302 } 1303 1304 static inline int xfrm_state_kern(const struct xfrm_state *x) 1305 { 1306 return atomic_read(&x->tunnel_users); 1307 } 1308 1309 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 1310 { 1311 return (!userproto || proto == userproto || 1312 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 1313 proto == IPPROTO_ESP || 1314 proto == IPPROTO_COMP))); 1315 } 1316 1317 /* 1318 * xfrm algorithm information 1319 */ 1320 struct xfrm_algo_aead_info { 1321 u16 icv_truncbits; 1322 }; 1323 1324 struct xfrm_algo_auth_info { 1325 u16 icv_truncbits; 1326 u16 icv_fullbits; 1327 }; 1328 1329 struct xfrm_algo_encr_info { 1330 u16 blockbits; 1331 u16 defkeybits; 1332 }; 1333 1334 struct xfrm_algo_comp_info { 1335 u16 threshold; 1336 }; 1337 1338 struct xfrm_algo_desc { 1339 char *name; 1340 char *compat; 1341 u8 available:1; 1342 u8 pfkey_supported:1; 1343 union { 1344 struct xfrm_algo_aead_info aead; 1345 struct xfrm_algo_auth_info auth; 1346 struct xfrm_algo_encr_info encr; 1347 struct xfrm_algo_comp_info comp; 1348 } uinfo; 1349 struct sadb_alg desc; 1350 }; 1351 1352 /* XFRM protocol handlers. */ 1353 struct xfrm4_protocol { 1354 int (*handler)(struct sk_buff *skb); 1355 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1356 int encap_type); 1357 int (*cb_handler)(struct sk_buff *skb, int err); 1358 int (*err_handler)(struct sk_buff *skb, u32 info); 1359 1360 struct xfrm4_protocol __rcu *next; 1361 int priority; 1362 }; 1363 1364 struct xfrm6_protocol { 1365 int (*handler)(struct sk_buff *skb); 1366 int (*cb_handler)(struct sk_buff *skb, int err); 1367 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1368 u8 type, u8 code, int offset, __be32 info); 1369 1370 struct xfrm6_protocol __rcu *next; 1371 int priority; 1372 }; 1373 1374 /* XFRM tunnel handlers. */ 1375 struct xfrm_tunnel { 1376 int (*handler)(struct sk_buff *skb); 1377 int (*err_handler)(struct sk_buff *skb, u32 info); 1378 1379 struct xfrm_tunnel __rcu *next; 1380 int priority; 1381 }; 1382 1383 struct xfrm6_tunnel { 1384 int (*handler)(struct sk_buff *skb); 1385 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1386 u8 type, u8 code, int offset, __be32 info); 1387 struct xfrm6_tunnel __rcu *next; 1388 int priority; 1389 }; 1390 1391 void xfrm_init(void); 1392 void xfrm4_init(void); 1393 int xfrm_state_init(struct net *net); 1394 void xfrm_state_fini(struct net *net); 1395 void xfrm4_state_init(void); 1396 void xfrm4_protocol_init(void); 1397 #ifdef CONFIG_XFRM 1398 int xfrm6_init(void); 1399 void xfrm6_fini(void); 1400 int xfrm6_state_init(void); 1401 void xfrm6_state_fini(void); 1402 int xfrm6_protocol_init(void); 1403 void xfrm6_protocol_fini(void); 1404 #else 1405 static inline int xfrm6_init(void) 1406 { 1407 return 0; 1408 } 1409 static inline void xfrm6_fini(void) 1410 { 1411 ; 1412 } 1413 #endif 1414 1415 #ifdef CONFIG_XFRM_STATISTICS 1416 int xfrm_proc_init(struct net *net); 1417 void xfrm_proc_fini(struct net *net); 1418 #endif 1419 1420 int xfrm_sysctl_init(struct net *net); 1421 #ifdef CONFIG_SYSCTL 1422 void xfrm_sysctl_fini(struct net *net); 1423 #else 1424 static inline void xfrm_sysctl_fini(struct net *net) 1425 { 1426 } 1427 #endif 1428 1429 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 1430 struct xfrm_address_filter *filter); 1431 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1432 int (*func)(struct xfrm_state *, int, void*), void *); 1433 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net); 1434 struct xfrm_state *xfrm_state_alloc(struct net *net); 1435 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr, 1436 const xfrm_address_t *saddr, 1437 const struct flowi *fl, 1438 struct xfrm_tmpl *tmpl, 1439 struct xfrm_policy *pol, int *err, 1440 unsigned short family); 1441 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, 1442 xfrm_address_t *daddr, 1443 xfrm_address_t *saddr, 1444 unsigned short family, 1445 u8 mode, u8 proto, u32 reqid); 1446 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1447 unsigned short family); 1448 int xfrm_state_check_expire(struct xfrm_state *x); 1449 void xfrm_state_insert(struct xfrm_state *x); 1450 int xfrm_state_add(struct xfrm_state *x); 1451 int xfrm_state_update(struct xfrm_state *x); 1452 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark, 1453 const xfrm_address_t *daddr, __be32 spi, 1454 u8 proto, unsigned short family); 1455 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1456 const xfrm_address_t *daddr, 1457 const xfrm_address_t *saddr, 1458 u8 proto, 1459 unsigned short family); 1460 #ifdef CONFIG_XFRM_SUB_POLICY 1461 int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1462 unsigned short family, struct net *net); 1463 int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1464 unsigned short family); 1465 #else 1466 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 1467 int n, unsigned short family, struct net *net) 1468 { 1469 return -ENOSYS; 1470 } 1471 1472 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 1473 int n, unsigned short family) 1474 { 1475 return -ENOSYS; 1476 } 1477 #endif 1478 1479 struct xfrmk_sadinfo { 1480 u32 sadhcnt; /* current hash bkts */ 1481 u32 sadhmcnt; /* max allowed hash bkts */ 1482 u32 sadcnt; /* current running count */ 1483 }; 1484 1485 struct xfrmk_spdinfo { 1486 u32 incnt; 1487 u32 outcnt; 1488 u32 fwdcnt; 1489 u32 inscnt; 1490 u32 outscnt; 1491 u32 fwdscnt; 1492 u32 spdhcnt; 1493 u32 spdhmcnt; 1494 }; 1495 1496 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1497 int xfrm_state_delete(struct xfrm_state *x); 1498 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid); 1499 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); 1500 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); 1501 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq); 1502 int xfrm_init_replay(struct xfrm_state *x); 1503 int xfrm_state_mtu(struct xfrm_state *x, int mtu); 1504 int __xfrm_init_state(struct xfrm_state *x, bool init_replay); 1505 int xfrm_init_state(struct xfrm_state *x); 1506 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb); 1507 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type); 1508 int xfrm_input_resume(struct sk_buff *skb, int nexthdr); 1509 int xfrm_output_resume(struct sk_buff *skb, int err); 1510 int xfrm_output(struct sk_buff *skb); 1511 int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1512 void xfrm_local_error(struct sk_buff *skb, int mtu); 1513 int xfrm4_extract_header(struct sk_buff *skb); 1514 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1515 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1516 int encap_type); 1517 int xfrm4_transport_finish(struct sk_buff *skb, int async); 1518 int xfrm4_rcv(struct sk_buff *skb); 1519 1520 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1521 { 1522 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL; 1523 XFRM_SPI_SKB_CB(skb)->family = AF_INET; 1524 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); 1525 return xfrm_input(skb, nexthdr, spi, 0); 1526 } 1527 1528 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1529 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb); 1530 int xfrm4_output(struct sock *sk, struct sk_buff *skb); 1531 int xfrm4_output_finish(struct sk_buff *skb); 1532 int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err); 1533 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol); 1534 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol); 1535 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1536 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1537 void xfrm4_local_error(struct sk_buff *skb, u32 mtu); 1538 int xfrm6_extract_header(struct sk_buff *skb); 1539 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1540 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi); 1541 int xfrm6_transport_finish(struct sk_buff *skb, int async); 1542 int xfrm6_rcv(struct sk_buff *skb); 1543 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1544 xfrm_address_t *saddr, u8 proto); 1545 void xfrm6_local_error(struct sk_buff *skb, u32 mtu); 1546 int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err); 1547 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol); 1548 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol); 1549 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1550 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1551 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr); 1552 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr); 1553 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1554 int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb); 1555 int xfrm6_output(struct sock *sk, struct sk_buff *skb); 1556 int xfrm6_output_finish(struct sk_buff *skb); 1557 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, 1558 u8 **prevhdr); 1559 1560 #ifdef CONFIG_XFRM 1561 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1562 int xfrm_user_policy(struct sock *sk, int optname, 1563 u8 __user *optval, int optlen); 1564 #else 1565 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 1566 { 1567 return -ENOPROTOOPT; 1568 } 1569 1570 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb) 1571 { 1572 /* should not happen */ 1573 kfree_skb(skb); 1574 return 0; 1575 } 1576 #endif 1577 1578 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); 1579 1580 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); 1581 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, 1582 int (*func)(struct xfrm_policy *, int, int, void*), 1583 void *); 1584 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net); 1585 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1586 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, 1587 u8 type, int dir, 1588 struct xfrm_selector *sel, 1589 struct xfrm_sec_ctx *ctx, int delete, 1590 int *err); 1591 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, 1592 u32 id, int delete, int *err); 1593 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid); 1594 void xfrm_policy_hash_rebuild(struct net *net); 1595 u32 xfrm_get_acqseq(void); 1596 int verify_spi_info(u8 proto, u32 min, u32 max); 1597 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 1598 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, 1599 u8 mode, u32 reqid, u8 proto, 1600 const xfrm_address_t *daddr, 1601 const xfrm_address_t *saddr, int create, 1602 unsigned short family); 1603 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1604 1605 #ifdef CONFIG_XFRM_MIGRATE 1606 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1607 const struct xfrm_migrate *m, int num_bundles, 1608 const struct xfrm_kmaddress *k); 1609 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net); 1610 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 1611 struct xfrm_migrate *m); 1612 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1613 struct xfrm_migrate *m, int num_bundles, 1614 struct xfrm_kmaddress *k, struct net *net); 1615 #endif 1616 1617 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1618 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid); 1619 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, 1620 xfrm_address_t *addr); 1621 1622 void xfrm_input_init(void); 1623 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1624 1625 void xfrm_probe_algs(void); 1626 int xfrm_count_pfkey_auth_supported(void); 1627 int xfrm_count_pfkey_enc_supported(void); 1628 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1629 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1630 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1631 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1632 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1633 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe); 1634 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe); 1635 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe); 1636 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, 1637 int probe); 1638 1639 static inline bool xfrm6_addr_equal(const xfrm_address_t *a, 1640 const xfrm_address_t *b) 1641 { 1642 return ipv6_addr_equal((const struct in6_addr *)a, 1643 (const struct in6_addr *)b); 1644 } 1645 1646 static inline bool xfrm_addr_equal(const xfrm_address_t *a, 1647 const xfrm_address_t *b, 1648 sa_family_t family) 1649 { 1650 switch (family) { 1651 default: 1652 case AF_INET: 1653 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0; 1654 case AF_INET6: 1655 return xfrm6_addr_equal(a, b); 1656 } 1657 } 1658 1659 static inline int xfrm_policy_id2dir(u32 index) 1660 { 1661 return index & 7; 1662 } 1663 1664 #ifdef CONFIG_XFRM 1665 static inline int xfrm_aevent_is_on(struct net *net) 1666 { 1667 struct sock *nlsk; 1668 int ret = 0; 1669 1670 rcu_read_lock(); 1671 nlsk = rcu_dereference(net->xfrm.nlsk); 1672 if (nlsk) 1673 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1674 rcu_read_unlock(); 1675 return ret; 1676 } 1677 1678 static inline int xfrm_acquire_is_on(struct net *net) 1679 { 1680 struct sock *nlsk; 1681 int ret = 0; 1682 1683 rcu_read_lock(); 1684 nlsk = rcu_dereference(net->xfrm.nlsk); 1685 if (nlsk) 1686 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE); 1687 rcu_read_unlock(); 1688 1689 return ret; 1690 } 1691 #endif 1692 1693 static inline int aead_len(struct xfrm_algo_aead *alg) 1694 { 1695 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1696 } 1697 1698 static inline int xfrm_alg_len(const struct xfrm_algo *alg) 1699 { 1700 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1701 } 1702 1703 static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg) 1704 { 1705 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1706 } 1707 1708 static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn) 1709 { 1710 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32); 1711 } 1712 1713 #ifdef CONFIG_XFRM_MIGRATE 1714 static inline int xfrm_replay_clone(struct xfrm_state *x, 1715 struct xfrm_state *orig) 1716 { 1717 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn), 1718 GFP_KERNEL); 1719 if (!x->replay_esn) 1720 return -ENOMEM; 1721 1722 x->replay_esn->bmp_len = orig->replay_esn->bmp_len; 1723 x->replay_esn->replay_window = orig->replay_esn->replay_window; 1724 1725 x->preplay_esn = kmemdup(x->replay_esn, 1726 xfrm_replay_state_esn_len(x->replay_esn), 1727 GFP_KERNEL); 1728 if (!x->preplay_esn) { 1729 kfree(x->replay_esn); 1730 return -ENOMEM; 1731 } 1732 1733 return 0; 1734 } 1735 1736 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig) 1737 { 1738 return kmemdup(orig, aead_len(orig), GFP_KERNEL); 1739 } 1740 1741 1742 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1743 { 1744 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); 1745 } 1746 1747 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig) 1748 { 1749 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL); 1750 } 1751 1752 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1753 { 1754 int i; 1755 for (i = 0; i < n; i++) 1756 xfrm_state_put(*(states + i)); 1757 } 1758 1759 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1760 { 1761 int i; 1762 for (i = 0; i < n; i++) 1763 xfrm_state_delete(*(states + i)); 1764 } 1765 #endif 1766 1767 #ifdef CONFIG_XFRM 1768 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) 1769 { 1770 return skb->sp->xvec[skb->sp->len - 1]; 1771 } 1772 #endif 1773 1774 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) 1775 { 1776 if (attrs[XFRMA_MARK]) 1777 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark)); 1778 else 1779 m->v = m->m = 0; 1780 1781 return m->v & m->m; 1782 } 1783 1784 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m) 1785 { 1786 int ret = 0; 1787 1788 if (m->m | m->v) 1789 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); 1790 return ret; 1791 } 1792 1793 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x, 1794 unsigned int family) 1795 { 1796 bool tunnel = false; 1797 1798 switch(family) { 1799 case AF_INET: 1800 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) 1801 tunnel = true; 1802 break; 1803 case AF_INET6: 1804 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) 1805 tunnel = true; 1806 break; 1807 } 1808 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL)) 1809 return -EINVAL; 1810 1811 return 0; 1812 } 1813 #endif /* _NET_XFRM_H */ 1814