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 possible_net_t xs_net; 130 union { 131 struct hlist_node gclist; 132 struct hlist_node bydst; 133 }; 134 struct hlist_node bysrc; 135 struct hlist_node byspi; 136 137 atomic_t refcnt; 138 spinlock_t lock; 139 140 struct xfrm_id id; 141 struct xfrm_selector sel; 142 struct xfrm_mark mark; 143 u32 tfcpad; 144 145 u32 genid; 146 147 /* Key manager bits */ 148 struct xfrm_state_walk km; 149 150 /* Parameters of this state. */ 151 struct { 152 u32 reqid; 153 u8 mode; 154 u8 replay_window; 155 u8 aalgo, ealgo, calgo; 156 u8 flags; 157 u16 family; 158 xfrm_address_t saddr; 159 int header_len; 160 int trailer_len; 161 u32 extra_flags; 162 } props; 163 164 struct xfrm_lifetime_cfg lft; 165 166 /* Data for transformer */ 167 struct xfrm_algo_auth *aalg; 168 struct xfrm_algo *ealg; 169 struct xfrm_algo *calg; 170 struct xfrm_algo_aead *aead; 171 const char *geniv; 172 173 /* Data for encapsulator */ 174 struct xfrm_encap_tmpl *encap; 175 176 /* Data for care-of address */ 177 xfrm_address_t *coaddr; 178 179 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 180 struct xfrm_state *tunnel; 181 182 /* If a tunnel, number of users + 1 */ 183 atomic_t tunnel_users; 184 185 /* State for replay detection */ 186 struct xfrm_replay_state replay; 187 struct xfrm_replay_state_esn *replay_esn; 188 189 /* Replay detection state at the time we sent the last notification */ 190 struct xfrm_replay_state preplay; 191 struct xfrm_replay_state_esn *preplay_esn; 192 193 /* The functions for replay detection. */ 194 struct xfrm_replay *repl; 195 196 /* internal flag that only holds state for delayed aevent at the 197 * moment 198 */ 199 u32 xflags; 200 201 /* Replay detection notification settings */ 202 u32 replay_maxage; 203 u32 replay_maxdiff; 204 205 /* Replay detection notification timer */ 206 struct timer_list rtimer; 207 208 /* Statistics */ 209 struct xfrm_stats stats; 210 211 struct xfrm_lifetime_cur curlft; 212 struct tasklet_hrtimer mtimer; 213 214 /* used to fix curlft->add_time when changing date */ 215 long saved_tmo; 216 217 /* Last used time */ 218 unsigned long lastused; 219 220 /* Reference to data common to all the instances of this 221 * transformer. */ 222 const struct xfrm_type *type; 223 struct xfrm_mode *inner_mode; 224 struct xfrm_mode *inner_mode_iaf; 225 struct xfrm_mode *outer_mode; 226 227 /* Security context */ 228 struct xfrm_sec_ctx *security; 229 230 /* Private data of this transformer, format is opaque, 231 * interpreted by xfrm_type methods. */ 232 void *data; 233 }; 234 235 static inline struct net *xs_net(struct xfrm_state *x) 236 { 237 return read_pnet(&x->xs_net); 238 } 239 240 /* xflags - make enum if more show up */ 241 #define XFRM_TIME_DEFER 1 242 #define XFRM_SOFT_EXPIRE 2 243 244 enum { 245 XFRM_STATE_VOID, 246 XFRM_STATE_ACQ, 247 XFRM_STATE_VALID, 248 XFRM_STATE_ERROR, 249 XFRM_STATE_EXPIRED, 250 XFRM_STATE_DEAD 251 }; 252 253 /* callback structure passed from either netlink or pfkey */ 254 struct km_event { 255 union { 256 u32 hard; 257 u32 proto; 258 u32 byid; 259 u32 aevent; 260 u32 type; 261 } data; 262 263 u32 seq; 264 u32 portid; 265 u32 event; 266 struct net *net; 267 }; 268 269 struct xfrm_replay { 270 void (*advance)(struct xfrm_state *x, __be32 net_seq); 271 int (*check)(struct xfrm_state *x, 272 struct sk_buff *skb, 273 __be32 net_seq); 274 int (*recheck)(struct xfrm_state *x, 275 struct sk_buff *skb, 276 __be32 net_seq); 277 void (*notify)(struct xfrm_state *x, int event); 278 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb); 279 }; 280 281 struct net_device; 282 struct xfrm_type; 283 struct xfrm_dst; 284 struct xfrm_policy_afinfo { 285 unsigned short family; 286 struct dst_ops *dst_ops; 287 void (*garbage_collect)(struct net *net); 288 struct dst_entry *(*dst_lookup)(struct net *net, 289 int tos, int oif, 290 const xfrm_address_t *saddr, 291 const xfrm_address_t *daddr); 292 int (*get_saddr)(struct net *net, int oif, 293 xfrm_address_t *saddr, 294 xfrm_address_t *daddr); 295 void (*decode_session)(struct sk_buff *skb, 296 struct flowi *fl, 297 int reverse); 298 int (*get_tos)(const struct flowi *fl); 299 void (*init_dst)(struct net *net, 300 struct xfrm_dst *dst); 301 int (*init_path)(struct xfrm_dst *path, 302 struct dst_entry *dst, 303 int nfheader_len); 304 int (*fill_dst)(struct xfrm_dst *xdst, 305 struct net_device *dev, 306 const struct flowi *fl); 307 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig); 308 }; 309 310 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); 311 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); 312 void km_policy_notify(struct xfrm_policy *xp, int dir, 313 const struct km_event *c); 314 void km_state_notify(struct xfrm_state *x, const struct km_event *c); 315 316 struct xfrm_tmpl; 317 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, 318 struct xfrm_policy *pol); 319 void km_state_expired(struct xfrm_state *x, int hard, u32 portid); 320 int __xfrm_state_delete(struct xfrm_state *x); 321 322 struct xfrm_state_afinfo { 323 unsigned int family; 324 unsigned int proto; 325 __be16 eth_proto; 326 struct module *owner; 327 const struct xfrm_type *type_map[IPPROTO_MAX]; 328 struct xfrm_mode *mode_map[XFRM_MODE_MAX]; 329 int (*init_flags)(struct xfrm_state *x); 330 void (*init_tempsel)(struct xfrm_selector *sel, 331 const struct flowi *fl); 332 void (*init_temprop)(struct xfrm_state *x, 333 const struct xfrm_tmpl *tmpl, 334 const xfrm_address_t *daddr, 335 const xfrm_address_t *saddr); 336 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n); 337 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n); 338 int (*output)(struct sock *sk, struct sk_buff *skb); 339 int (*output_finish)(struct sock *sk, struct sk_buff *skb); 340 int (*extract_input)(struct xfrm_state *x, 341 struct sk_buff *skb); 342 int (*extract_output)(struct xfrm_state *x, 343 struct sk_buff *skb); 344 int (*transport_finish)(struct sk_buff *skb, 345 int async); 346 void (*local_error)(struct sk_buff *skb, u32 mtu); 347 }; 348 349 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 350 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 351 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); 352 void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); 353 354 struct xfrm_input_afinfo { 355 unsigned int family; 356 struct module *owner; 357 int (*callback)(struct sk_buff *skb, u8 protocol, 358 int err); 359 }; 360 361 int xfrm_input_register_afinfo(struct xfrm_input_afinfo *afinfo); 362 int xfrm_input_unregister_afinfo(struct xfrm_input_afinfo *afinfo); 363 364 void xfrm_state_delete_tunnel(struct xfrm_state *x); 365 366 struct xfrm_type { 367 char *description; 368 struct module *owner; 369 u8 proto; 370 u8 flags; 371 #define XFRM_TYPE_NON_FRAGMENT 1 372 #define XFRM_TYPE_REPLAY_PROT 2 373 #define XFRM_TYPE_LOCAL_COADDR 4 374 #define XFRM_TYPE_REMOTE_COADDR 8 375 376 int (*init_state)(struct xfrm_state *x); 377 void (*destructor)(struct xfrm_state *); 378 int (*input)(struct xfrm_state *, struct sk_buff *skb); 379 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 380 int (*reject)(struct xfrm_state *, struct sk_buff *, 381 const struct flowi *); 382 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **); 383 /* Estimate maximal size of result of transformation of a dgram */ 384 u32 (*get_mtu)(struct xfrm_state *, int size); 385 }; 386 387 int xfrm_register_type(const struct xfrm_type *type, unsigned short family); 388 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); 389 390 struct xfrm_mode { 391 /* 392 * Remove encapsulation header. 393 * 394 * The IP header will be moved over the top of the encapsulation 395 * header. 396 * 397 * On entry, the transport header shall point to where the IP header 398 * should be and the network header shall be set to where the IP 399 * header currently is. skb->data shall point to the start of the 400 * payload. 401 */ 402 int (*input2)(struct xfrm_state *x, struct sk_buff *skb); 403 404 /* 405 * This is the actual input entry point. 406 * 407 * For transport mode and equivalent this would be identical to 408 * input2 (which does not need to be set). While tunnel mode 409 * and equivalent would set this to the tunnel encapsulation function 410 * xfrm4_prepare_input that would in turn call input2. 411 */ 412 int (*input)(struct xfrm_state *x, struct sk_buff *skb); 413 414 /* 415 * Add encapsulation header. 416 * 417 * On exit, the transport header will be set to the start of the 418 * encapsulation header to be filled in by x->type->output and 419 * the mac header will be set to the nextheader (protocol for 420 * IPv4) field of the extension header directly preceding the 421 * encapsulation header, or in its absence, that of the top IP 422 * header. The value of the network header will always point 423 * to the top IP header while skb->data will point to the payload. 424 */ 425 int (*output2)(struct xfrm_state *x,struct sk_buff *skb); 426 427 /* 428 * This is the actual output entry point. 429 * 430 * For transport mode and equivalent this would be identical to 431 * output2 (which does not need to be set). While tunnel mode 432 * and equivalent would set this to a tunnel encapsulation function 433 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn 434 * call output2. 435 */ 436 int (*output)(struct xfrm_state *x, struct sk_buff *skb); 437 438 struct xfrm_state_afinfo *afinfo; 439 struct module *owner; 440 unsigned int encap; 441 int flags; 442 }; 443 444 /* Flags for xfrm_mode. */ 445 enum { 446 XFRM_MODE_FLAG_TUNNEL = 1, 447 }; 448 449 int xfrm_register_mode(struct xfrm_mode *mode, int family); 450 int xfrm_unregister_mode(struct xfrm_mode *mode, int family); 451 452 static inline int xfrm_af2proto(unsigned int family) 453 { 454 switch(family) { 455 case AF_INET: 456 return IPPROTO_IPIP; 457 case AF_INET6: 458 return IPPROTO_IPV6; 459 default: 460 return 0; 461 } 462 } 463 464 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto) 465 { 466 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) || 467 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6)) 468 return x->inner_mode; 469 else 470 return x->inner_mode_iaf; 471 } 472 473 struct xfrm_tmpl { 474 /* id in template is interpreted as: 475 * daddr - destination of tunnel, may be zero for transport mode. 476 * spi - zero to acquire spi. Not zero if spi is static, then 477 * daddr must be fixed too. 478 * proto - AH/ESP/IPCOMP 479 */ 480 struct xfrm_id id; 481 482 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 483 xfrm_address_t saddr; 484 485 unsigned short encap_family; 486 487 u32 reqid; 488 489 /* Mode: transport, tunnel etc. */ 490 u8 mode; 491 492 /* Sharing mode: unique, this session only, this user only etc. */ 493 u8 share; 494 495 /* May skip this transfomration if no SA is found */ 496 u8 optional; 497 498 /* Skip aalgos/ealgos/calgos checks. */ 499 u8 allalgs; 500 501 /* Bit mask of algos allowed for acquisition */ 502 u32 aalgos; 503 u32 ealgos; 504 u32 calgos; 505 }; 506 507 #define XFRM_MAX_DEPTH 6 508 509 struct xfrm_policy_walk_entry { 510 struct list_head all; 511 u8 dead; 512 }; 513 514 struct xfrm_policy_walk { 515 struct xfrm_policy_walk_entry walk; 516 u8 type; 517 u32 seq; 518 }; 519 520 struct xfrm_policy_queue { 521 struct sk_buff_head hold_queue; 522 struct timer_list hold_timer; 523 unsigned long timeout; 524 }; 525 526 struct xfrm_policy { 527 possible_net_t xp_net; 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(&addr->in6); 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 saddr->in6 = fl->u.ip6.saddr; 1246 daddr->in6 = 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 char *geniv; 1322 u16 icv_truncbits; 1323 }; 1324 1325 struct xfrm_algo_auth_info { 1326 u16 icv_truncbits; 1327 u16 icv_fullbits; 1328 }; 1329 1330 struct xfrm_algo_encr_info { 1331 char *geniv; 1332 u16 blockbits; 1333 u16 defkeybits; 1334 }; 1335 1336 struct xfrm_algo_comp_info { 1337 u16 threshold; 1338 }; 1339 1340 struct xfrm_algo_desc { 1341 char *name; 1342 char *compat; 1343 u8 available:1; 1344 u8 pfkey_supported:1; 1345 union { 1346 struct xfrm_algo_aead_info aead; 1347 struct xfrm_algo_auth_info auth; 1348 struct xfrm_algo_encr_info encr; 1349 struct xfrm_algo_comp_info comp; 1350 } uinfo; 1351 struct sadb_alg desc; 1352 }; 1353 1354 /* XFRM protocol handlers. */ 1355 struct xfrm4_protocol { 1356 int (*handler)(struct sk_buff *skb); 1357 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1358 int encap_type); 1359 int (*cb_handler)(struct sk_buff *skb, int err); 1360 int (*err_handler)(struct sk_buff *skb, u32 info); 1361 1362 struct xfrm4_protocol __rcu *next; 1363 int priority; 1364 }; 1365 1366 struct xfrm6_protocol { 1367 int (*handler)(struct sk_buff *skb); 1368 int (*cb_handler)(struct sk_buff *skb, int err); 1369 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1370 u8 type, u8 code, int offset, __be32 info); 1371 1372 struct xfrm6_protocol __rcu *next; 1373 int priority; 1374 }; 1375 1376 /* XFRM tunnel handlers. */ 1377 struct xfrm_tunnel { 1378 int (*handler)(struct sk_buff *skb); 1379 int (*err_handler)(struct sk_buff *skb, u32 info); 1380 1381 struct xfrm_tunnel __rcu *next; 1382 int priority; 1383 }; 1384 1385 struct xfrm6_tunnel { 1386 int (*handler)(struct sk_buff *skb); 1387 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1388 u8 type, u8 code, int offset, __be32 info); 1389 struct xfrm6_tunnel __rcu *next; 1390 int priority; 1391 }; 1392 1393 void xfrm_init(void); 1394 void xfrm4_init(void); 1395 int xfrm_state_init(struct net *net); 1396 void xfrm_state_fini(struct net *net); 1397 void xfrm4_state_init(void); 1398 void xfrm4_protocol_init(void); 1399 #ifdef CONFIG_XFRM 1400 int xfrm6_init(void); 1401 void xfrm6_fini(void); 1402 int xfrm6_state_init(void); 1403 void xfrm6_state_fini(void); 1404 int xfrm6_protocol_init(void); 1405 void xfrm6_protocol_fini(void); 1406 #else 1407 static inline int xfrm6_init(void) 1408 { 1409 return 0; 1410 } 1411 static inline void xfrm6_fini(void) 1412 { 1413 ; 1414 } 1415 #endif 1416 1417 #ifdef CONFIG_XFRM_STATISTICS 1418 int xfrm_proc_init(struct net *net); 1419 void xfrm_proc_fini(struct net *net); 1420 #endif 1421 1422 int xfrm_sysctl_init(struct net *net); 1423 #ifdef CONFIG_SYSCTL 1424 void xfrm_sysctl_fini(struct net *net); 1425 #else 1426 static inline void xfrm_sysctl_fini(struct net *net) 1427 { 1428 } 1429 #endif 1430 1431 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 1432 struct xfrm_address_filter *filter); 1433 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1434 int (*func)(struct xfrm_state *, int, void*), void *); 1435 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net); 1436 struct xfrm_state *xfrm_state_alloc(struct net *net); 1437 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr, 1438 const xfrm_address_t *saddr, 1439 const struct flowi *fl, 1440 struct xfrm_tmpl *tmpl, 1441 struct xfrm_policy *pol, int *err, 1442 unsigned short family); 1443 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, 1444 xfrm_address_t *daddr, 1445 xfrm_address_t *saddr, 1446 unsigned short family, 1447 u8 mode, u8 proto, u32 reqid); 1448 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1449 unsigned short family); 1450 int xfrm_state_check_expire(struct xfrm_state *x); 1451 void xfrm_state_insert(struct xfrm_state *x); 1452 int xfrm_state_add(struct xfrm_state *x); 1453 int xfrm_state_update(struct xfrm_state *x); 1454 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark, 1455 const xfrm_address_t *daddr, __be32 spi, 1456 u8 proto, unsigned short family); 1457 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1458 const xfrm_address_t *daddr, 1459 const xfrm_address_t *saddr, 1460 u8 proto, 1461 unsigned short family); 1462 #ifdef CONFIG_XFRM_SUB_POLICY 1463 int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1464 unsigned short family, struct net *net); 1465 int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1466 unsigned short family); 1467 #else 1468 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 1469 int n, unsigned short family, struct net *net) 1470 { 1471 return -ENOSYS; 1472 } 1473 1474 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 1475 int n, unsigned short family) 1476 { 1477 return -ENOSYS; 1478 } 1479 #endif 1480 1481 struct xfrmk_sadinfo { 1482 u32 sadhcnt; /* current hash bkts */ 1483 u32 sadhmcnt; /* max allowed hash bkts */ 1484 u32 sadcnt; /* current running count */ 1485 }; 1486 1487 struct xfrmk_spdinfo { 1488 u32 incnt; 1489 u32 outcnt; 1490 u32 fwdcnt; 1491 u32 inscnt; 1492 u32 outscnt; 1493 u32 fwdscnt; 1494 u32 spdhcnt; 1495 u32 spdhmcnt; 1496 }; 1497 1498 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1499 int xfrm_state_delete(struct xfrm_state *x); 1500 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid); 1501 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); 1502 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); 1503 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq); 1504 int xfrm_init_replay(struct xfrm_state *x); 1505 int xfrm_state_mtu(struct xfrm_state *x, int mtu); 1506 int __xfrm_init_state(struct xfrm_state *x, bool init_replay); 1507 int xfrm_init_state(struct xfrm_state *x); 1508 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb); 1509 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type); 1510 int xfrm_input_resume(struct sk_buff *skb, int nexthdr); 1511 int xfrm_output_resume(struct sk_buff *skb, int err); 1512 int xfrm_output(struct sock *sk, struct sk_buff *skb); 1513 int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1514 void xfrm_local_error(struct sk_buff *skb, int mtu); 1515 int xfrm4_extract_header(struct sk_buff *skb); 1516 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1517 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1518 int encap_type); 1519 int xfrm4_transport_finish(struct sk_buff *skb, int async); 1520 int xfrm4_rcv(struct sk_buff *skb); 1521 1522 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1523 { 1524 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL; 1525 XFRM_SPI_SKB_CB(skb)->family = AF_INET; 1526 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); 1527 return xfrm_input(skb, nexthdr, spi, 0); 1528 } 1529 1530 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1531 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb); 1532 int xfrm4_output(struct sock *sk, struct sk_buff *skb); 1533 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb); 1534 int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err); 1535 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol); 1536 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol); 1537 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1538 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1539 void xfrm4_local_error(struct sk_buff *skb, u32 mtu); 1540 int xfrm6_extract_header(struct sk_buff *skb); 1541 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1542 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi); 1543 int xfrm6_transport_finish(struct sk_buff *skb, int async); 1544 int xfrm6_rcv(struct sk_buff *skb); 1545 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1546 xfrm_address_t *saddr, u8 proto); 1547 void xfrm6_local_error(struct sk_buff *skb, u32 mtu); 1548 int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err); 1549 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol); 1550 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol); 1551 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1552 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1553 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr); 1554 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr); 1555 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1556 int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb); 1557 int xfrm6_output(struct sock *sk, struct sk_buff *skb); 1558 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb); 1559 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, 1560 u8 **prevhdr); 1561 1562 #ifdef CONFIG_XFRM 1563 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1564 int xfrm_user_policy(struct sock *sk, int optname, 1565 u8 __user *optval, int optlen); 1566 #else 1567 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 1568 { 1569 return -ENOPROTOOPT; 1570 } 1571 1572 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb) 1573 { 1574 /* should not happen */ 1575 kfree_skb(skb); 1576 return 0; 1577 } 1578 #endif 1579 1580 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); 1581 1582 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); 1583 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, 1584 int (*func)(struct xfrm_policy *, int, int, void*), 1585 void *); 1586 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net); 1587 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1588 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, 1589 u8 type, int dir, 1590 struct xfrm_selector *sel, 1591 struct xfrm_sec_ctx *ctx, int delete, 1592 int *err); 1593 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, 1594 u32 id, int delete, int *err); 1595 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid); 1596 void xfrm_policy_hash_rebuild(struct net *net); 1597 u32 xfrm_get_acqseq(void); 1598 int verify_spi_info(u8 proto, u32 min, u32 max); 1599 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 1600 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, 1601 u8 mode, u32 reqid, u8 proto, 1602 const xfrm_address_t *daddr, 1603 const xfrm_address_t *saddr, int create, 1604 unsigned short family); 1605 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1606 1607 #ifdef CONFIG_XFRM_MIGRATE 1608 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1609 const struct xfrm_migrate *m, int num_bundles, 1610 const struct xfrm_kmaddress *k); 1611 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net); 1612 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 1613 struct xfrm_migrate *m); 1614 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1615 struct xfrm_migrate *m, int num_bundles, 1616 struct xfrm_kmaddress *k, struct net *net); 1617 #endif 1618 1619 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1620 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid); 1621 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, 1622 xfrm_address_t *addr); 1623 1624 void xfrm_input_init(void); 1625 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1626 1627 void xfrm_probe_algs(void); 1628 int xfrm_count_pfkey_auth_supported(void); 1629 int xfrm_count_pfkey_enc_supported(void); 1630 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1631 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1632 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1633 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1634 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1635 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe); 1636 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe); 1637 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe); 1638 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, 1639 int probe); 1640 1641 static inline bool xfrm6_addr_equal(const xfrm_address_t *a, 1642 const xfrm_address_t *b) 1643 { 1644 return ipv6_addr_equal((const struct in6_addr *)a, 1645 (const struct in6_addr *)b); 1646 } 1647 1648 static inline bool xfrm_addr_equal(const xfrm_address_t *a, 1649 const xfrm_address_t *b, 1650 sa_family_t family) 1651 { 1652 switch (family) { 1653 default: 1654 case AF_INET: 1655 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0; 1656 case AF_INET6: 1657 return xfrm6_addr_equal(a, b); 1658 } 1659 } 1660 1661 static inline int xfrm_policy_id2dir(u32 index) 1662 { 1663 return index & 7; 1664 } 1665 1666 #ifdef CONFIG_XFRM 1667 static inline int xfrm_aevent_is_on(struct net *net) 1668 { 1669 struct sock *nlsk; 1670 int ret = 0; 1671 1672 rcu_read_lock(); 1673 nlsk = rcu_dereference(net->xfrm.nlsk); 1674 if (nlsk) 1675 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1676 rcu_read_unlock(); 1677 return ret; 1678 } 1679 1680 static inline int xfrm_acquire_is_on(struct net *net) 1681 { 1682 struct sock *nlsk; 1683 int ret = 0; 1684 1685 rcu_read_lock(); 1686 nlsk = rcu_dereference(net->xfrm.nlsk); 1687 if (nlsk) 1688 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE); 1689 rcu_read_unlock(); 1690 1691 return ret; 1692 } 1693 #endif 1694 1695 static inline int aead_len(struct xfrm_algo_aead *alg) 1696 { 1697 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1698 } 1699 1700 static inline int xfrm_alg_len(const struct xfrm_algo *alg) 1701 { 1702 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1703 } 1704 1705 static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg) 1706 { 1707 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1708 } 1709 1710 static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn) 1711 { 1712 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32); 1713 } 1714 1715 #ifdef CONFIG_XFRM_MIGRATE 1716 static inline int xfrm_replay_clone(struct xfrm_state *x, 1717 struct xfrm_state *orig) 1718 { 1719 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn), 1720 GFP_KERNEL); 1721 if (!x->replay_esn) 1722 return -ENOMEM; 1723 1724 x->replay_esn->bmp_len = orig->replay_esn->bmp_len; 1725 x->replay_esn->replay_window = orig->replay_esn->replay_window; 1726 1727 x->preplay_esn = kmemdup(x->replay_esn, 1728 xfrm_replay_state_esn_len(x->replay_esn), 1729 GFP_KERNEL); 1730 if (!x->preplay_esn) { 1731 kfree(x->replay_esn); 1732 return -ENOMEM; 1733 } 1734 1735 return 0; 1736 } 1737 1738 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig) 1739 { 1740 return kmemdup(orig, aead_len(orig), GFP_KERNEL); 1741 } 1742 1743 1744 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1745 { 1746 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); 1747 } 1748 1749 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig) 1750 { 1751 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL); 1752 } 1753 1754 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1755 { 1756 int i; 1757 for (i = 0; i < n; i++) 1758 xfrm_state_put(*(states + i)); 1759 } 1760 1761 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1762 { 1763 int i; 1764 for (i = 0; i < n; i++) 1765 xfrm_state_delete(*(states + i)); 1766 } 1767 #endif 1768 1769 #ifdef CONFIG_XFRM 1770 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) 1771 { 1772 return skb->sp->xvec[skb->sp->len - 1]; 1773 } 1774 #endif 1775 1776 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) 1777 { 1778 if (attrs[XFRMA_MARK]) 1779 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark)); 1780 else 1781 m->v = m->m = 0; 1782 1783 return m->v & m->m; 1784 } 1785 1786 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m) 1787 { 1788 int ret = 0; 1789 1790 if (m->m | m->v) 1791 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); 1792 return ret; 1793 } 1794 1795 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x, 1796 unsigned int family) 1797 { 1798 bool tunnel = false; 1799 1800 switch(family) { 1801 case AF_INET: 1802 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) 1803 tunnel = true; 1804 break; 1805 case AF_INET6: 1806 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) 1807 tunnel = true; 1808 break; 1809 } 1810 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL)) 1811 return -EINVAL; 1812 1813 return 0; 1814 } 1815 #endif /* _NET_XFRM_H */ 1816