1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _NET_XFRM_H 3 #define _NET_XFRM_H 4 5 #include <linux/compiler.h> 6 #include <linux/xfrm.h> 7 #include <linux/spinlock.h> 8 #include <linux/list.h> 9 #include <linux/skbuff.h> 10 #include <linux/socket.h> 11 #include <linux/pfkeyv2.h> 12 #include <linux/ipsec.h> 13 #include <linux/in6.h> 14 #include <linux/mutex.h> 15 #include <linux/audit.h> 16 #include <linux/slab.h> 17 #include <linux/refcount.h> 18 19 #include <net/sock.h> 20 #include <net/dst.h> 21 #include <net/ip.h> 22 #include <net/route.h> 23 #include <net/ipv6.h> 24 #include <net/ip6_fib.h> 25 #include <net/flow.h> 26 #include <net/gro_cells.h> 27 28 #include <linux/interrupt.h> 29 30 #ifdef CONFIG_XFRM_STATISTICS 31 #include <net/snmp.h> 32 #endif 33 34 #define XFRM_PROTO_ESP 50 35 #define XFRM_PROTO_AH 51 36 #define XFRM_PROTO_COMP 108 37 #define XFRM_PROTO_IPIP 4 38 #define XFRM_PROTO_IPV6 41 39 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING 40 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS 41 42 #define XFRM_ALIGN4(len) (((len) + 3) & ~3) 43 #define XFRM_ALIGN8(len) (((len) + 7) & ~7) 44 #define MODULE_ALIAS_XFRM_MODE(family, encap) \ 45 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap)) 46 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \ 47 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto)) 48 #define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \ 49 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto)) 50 51 #ifdef CONFIG_XFRM_STATISTICS 52 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field) 53 #else 54 #define XFRM_INC_STATS(net, field) ((void)(net)) 55 #endif 56 57 58 /* Organization of SPD aka "XFRM rules" 59 ------------------------------------ 60 61 Basic objects: 62 - policy rule, struct xfrm_policy (=SPD entry) 63 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) 64 - instance of a transformer, struct xfrm_state (=SA) 65 - template to clone xfrm_state, struct xfrm_tmpl 66 67 SPD is plain linear list of xfrm_policy rules, ordered by priority. 68 (To be compatible with existing pfkeyv2 implementations, 69 many rules with priority of 0x7fffffff are allowed to exist and 70 such rules are ordered in an unpredictable way, thanks to bsd folks.) 71 72 Lookup is plain linear search until the first match with selector. 73 74 If "action" is "block", then we prohibit the flow, otherwise: 75 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, 76 policy entry has list of up to XFRM_MAX_DEPTH transformations, 77 described by templates xfrm_tmpl. Each template is resolved 78 to a complete xfrm_state (see below) and we pack bundle of transformations 79 to a dst_entry returned to requestor. 80 81 dst -. xfrm .-> xfrm_state #1 82 |---. child .-> dst -. xfrm .-> xfrm_state #2 83 |---. child .-> dst -. xfrm .-> xfrm_state #3 84 |---. child .-> NULL 85 86 Bundles are cached at xrfm_policy struct (field ->bundles). 87 88 89 Resolution of xrfm_tmpl 90 ----------------------- 91 Template contains: 92 1. ->mode Mode: transport or tunnel 93 2. ->id.proto Protocol: AH/ESP/IPCOMP 94 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. 95 Q: allow to resolve security gateway? 96 4. ->id.spi If not zero, static SPI. 97 5. ->saddr Local tunnel endpoint, ignored for transport mode. 98 6. ->algos List of allowed algos. Plain bitmask now. 99 Q: ealgos, aalgos, calgos. What a mess... 100 7. ->share Sharing mode. 101 Q: how to implement private sharing mode? To add struct sock* to 102 flow id? 103 104 Having this template we search through SAD searching for entries 105 with appropriate mode/proto/algo, permitted by selector. 106 If no appropriate entry found, it is requested from key manager. 107 108 PROBLEMS: 109 Q: How to find all the bundles referring to a physical path for 110 PMTU discovery? Seems, dst should contain list of all parents... 111 and enter to infinite locking hierarchy disaster. 112 No! It is easier, we will not search for them, let them find us. 113 We add genid to each dst plus pointer to genid of raw IP route, 114 pmtu disc will update pmtu on raw IP route and increase its genid. 115 dst_check() will see this for top level and trigger resyncing 116 metrics. Plus, it will be made via sk->sk_dst_cache. Solved. 117 */ 118 119 struct xfrm_state_walk { 120 struct list_head all; 121 u8 state; 122 u8 dying; 123 u8 proto; 124 u32 seq; 125 struct xfrm_address_filter *filter; 126 }; 127 128 struct xfrm_state_offload { 129 struct net_device *dev; 130 unsigned long offload_handle; 131 unsigned int num_exthdrs; 132 u8 flags; 133 }; 134 135 /* Full description of state of transformer. */ 136 struct xfrm_state { 137 possible_net_t xs_net; 138 union { 139 struct hlist_node gclist; 140 struct hlist_node bydst; 141 }; 142 struct hlist_node bysrc; 143 struct hlist_node byspi; 144 145 refcount_t refcnt; 146 spinlock_t lock; 147 148 struct xfrm_id id; 149 struct xfrm_selector sel; 150 struct xfrm_mark mark; 151 u32 if_id; 152 u32 tfcpad; 153 154 u32 genid; 155 156 /* Key manager bits */ 157 struct xfrm_state_walk km; 158 159 /* Parameters of this state. */ 160 struct { 161 u32 reqid; 162 u8 mode; 163 u8 replay_window; 164 u8 aalgo, ealgo, calgo; 165 u8 flags; 166 u16 family; 167 xfrm_address_t saddr; 168 int header_len; 169 int trailer_len; 170 u32 extra_flags; 171 struct xfrm_mark smark; 172 } props; 173 174 struct xfrm_lifetime_cfg lft; 175 176 /* Data for transformer */ 177 struct xfrm_algo_auth *aalg; 178 struct xfrm_algo *ealg; 179 struct xfrm_algo *calg; 180 struct xfrm_algo_aead *aead; 181 const char *geniv; 182 183 /* Data for encapsulator */ 184 struct xfrm_encap_tmpl *encap; 185 186 /* Data for care-of address */ 187 xfrm_address_t *coaddr; 188 189 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 190 struct xfrm_state *tunnel; 191 192 /* If a tunnel, number of users + 1 */ 193 atomic_t tunnel_users; 194 195 /* State for replay detection */ 196 struct xfrm_replay_state replay; 197 struct xfrm_replay_state_esn *replay_esn; 198 199 /* Replay detection state at the time we sent the last notification */ 200 struct xfrm_replay_state preplay; 201 struct xfrm_replay_state_esn *preplay_esn; 202 203 /* The functions for replay detection. */ 204 const struct xfrm_replay *repl; 205 206 /* internal flag that only holds state for delayed aevent at the 207 * moment 208 */ 209 u32 xflags; 210 211 /* Replay detection notification settings */ 212 u32 replay_maxage; 213 u32 replay_maxdiff; 214 215 /* Replay detection notification timer */ 216 struct timer_list rtimer; 217 218 /* Statistics */ 219 struct xfrm_stats stats; 220 221 struct xfrm_lifetime_cur curlft; 222 struct tasklet_hrtimer mtimer; 223 224 struct xfrm_state_offload xso; 225 226 /* used to fix curlft->add_time when changing date */ 227 long saved_tmo; 228 229 /* Last used time */ 230 time64_t lastused; 231 232 struct page_frag xfrag; 233 234 /* Reference to data common to all the instances of this 235 * transformer. */ 236 const struct xfrm_type *type; 237 struct xfrm_mode *inner_mode; 238 struct xfrm_mode *inner_mode_iaf; 239 struct xfrm_mode *outer_mode; 240 241 const struct xfrm_type_offload *type_offload; 242 243 /* Security context */ 244 struct xfrm_sec_ctx *security; 245 246 /* Private data of this transformer, format is opaque, 247 * interpreted by xfrm_type methods. */ 248 void *data; 249 }; 250 251 static inline struct net *xs_net(struct xfrm_state *x) 252 { 253 return read_pnet(&x->xs_net); 254 } 255 256 /* xflags - make enum if more show up */ 257 #define XFRM_TIME_DEFER 1 258 #define XFRM_SOFT_EXPIRE 2 259 260 enum { 261 XFRM_STATE_VOID, 262 XFRM_STATE_ACQ, 263 XFRM_STATE_VALID, 264 XFRM_STATE_ERROR, 265 XFRM_STATE_EXPIRED, 266 XFRM_STATE_DEAD 267 }; 268 269 /* callback structure passed from either netlink or pfkey */ 270 struct km_event { 271 union { 272 u32 hard; 273 u32 proto; 274 u32 byid; 275 u32 aevent; 276 u32 type; 277 } data; 278 279 u32 seq; 280 u32 portid; 281 u32 event; 282 struct net *net; 283 }; 284 285 struct xfrm_replay { 286 void (*advance)(struct xfrm_state *x, __be32 net_seq); 287 int (*check)(struct xfrm_state *x, 288 struct sk_buff *skb, 289 __be32 net_seq); 290 int (*recheck)(struct xfrm_state *x, 291 struct sk_buff *skb, 292 __be32 net_seq); 293 void (*notify)(struct xfrm_state *x, int event); 294 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb); 295 }; 296 297 struct xfrm_if_cb { 298 struct xfrm_if *(*decode_session)(struct sk_buff *skb, 299 unsigned short family); 300 }; 301 302 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb); 303 void xfrm_if_unregister_cb(void); 304 305 struct net_device; 306 struct xfrm_type; 307 struct xfrm_dst; 308 struct xfrm_policy_afinfo { 309 struct dst_ops *dst_ops; 310 struct dst_entry *(*dst_lookup)(struct net *net, 311 int tos, int oif, 312 const xfrm_address_t *saddr, 313 const xfrm_address_t *daddr, 314 u32 mark); 315 int (*get_saddr)(struct net *net, int oif, 316 xfrm_address_t *saddr, 317 xfrm_address_t *daddr, 318 u32 mark); 319 void (*decode_session)(struct sk_buff *skb, 320 struct flowi *fl, 321 int reverse); 322 int (*get_tos)(const struct flowi *fl); 323 int (*init_path)(struct xfrm_dst *path, 324 struct dst_entry *dst, 325 int nfheader_len); 326 int (*fill_dst)(struct xfrm_dst *xdst, 327 struct net_device *dev, 328 const struct flowi *fl); 329 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig); 330 }; 331 332 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family); 333 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo); 334 void km_policy_notify(struct xfrm_policy *xp, int dir, 335 const struct km_event *c); 336 void km_state_notify(struct xfrm_state *x, const struct km_event *c); 337 338 struct xfrm_tmpl; 339 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, 340 struct xfrm_policy *pol); 341 void km_state_expired(struct xfrm_state *x, int hard, u32 portid); 342 int __xfrm_state_delete(struct xfrm_state *x); 343 344 struct xfrm_state_afinfo { 345 unsigned int family; 346 unsigned int proto; 347 __be16 eth_proto; 348 struct module *owner; 349 const struct xfrm_type *type_map[IPPROTO_MAX]; 350 const struct xfrm_type_offload *type_offload_map[IPPROTO_MAX]; 351 struct xfrm_mode *mode_map[XFRM_MODE_MAX]; 352 353 int (*init_flags)(struct xfrm_state *x); 354 void (*init_tempsel)(struct xfrm_selector *sel, 355 const struct flowi *fl); 356 void (*init_temprop)(struct xfrm_state *x, 357 const struct xfrm_tmpl *tmpl, 358 const xfrm_address_t *daddr, 359 const xfrm_address_t *saddr); 360 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n); 361 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n); 362 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb); 363 int (*output_finish)(struct sock *sk, struct sk_buff *skb); 364 int (*extract_input)(struct xfrm_state *x, 365 struct sk_buff *skb); 366 int (*extract_output)(struct xfrm_state *x, 367 struct sk_buff *skb); 368 int (*transport_finish)(struct sk_buff *skb, 369 int async); 370 void (*local_error)(struct sk_buff *skb, u32 mtu); 371 }; 372 373 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 374 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 375 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); 376 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family); 377 378 struct xfrm_input_afinfo { 379 unsigned int family; 380 int (*callback)(struct sk_buff *skb, u8 protocol, 381 int err); 382 }; 383 384 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo); 385 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo); 386 387 void xfrm_flush_gc(void); 388 void xfrm_state_delete_tunnel(struct xfrm_state *x); 389 390 struct xfrm_type { 391 char *description; 392 struct module *owner; 393 u8 proto; 394 u8 flags; 395 #define XFRM_TYPE_NON_FRAGMENT 1 396 #define XFRM_TYPE_REPLAY_PROT 2 397 #define XFRM_TYPE_LOCAL_COADDR 4 398 #define XFRM_TYPE_REMOTE_COADDR 8 399 400 int (*init_state)(struct xfrm_state *x); 401 void (*destructor)(struct xfrm_state *); 402 int (*input)(struct xfrm_state *, struct sk_buff *skb); 403 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 404 int (*reject)(struct xfrm_state *, struct sk_buff *, 405 const struct flowi *); 406 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **); 407 /* Estimate maximal size of result of transformation of a dgram */ 408 u32 (*get_mtu)(struct xfrm_state *, int size); 409 }; 410 411 int xfrm_register_type(const struct xfrm_type *type, unsigned short family); 412 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); 413 414 struct xfrm_type_offload { 415 char *description; 416 struct module *owner; 417 u8 proto; 418 void (*encap)(struct xfrm_state *, struct sk_buff *pskb); 419 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb); 420 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features); 421 }; 422 423 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family); 424 int xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family); 425 426 struct xfrm_mode { 427 /* 428 * Remove encapsulation header. 429 * 430 * The IP header will be moved over the top of the encapsulation 431 * header. 432 * 433 * On entry, the transport header shall point to where the IP header 434 * should be and the network header shall be set to where the IP 435 * header currently is. skb->data shall point to the start of the 436 * payload. 437 */ 438 int (*input2)(struct xfrm_state *x, struct sk_buff *skb); 439 440 /* 441 * This is the actual input entry point. 442 * 443 * For transport mode and equivalent this would be identical to 444 * input2 (which does not need to be set). While tunnel mode 445 * and equivalent would set this to the tunnel encapsulation function 446 * xfrm4_prepare_input that would in turn call input2. 447 */ 448 int (*input)(struct xfrm_state *x, struct sk_buff *skb); 449 450 /* 451 * Add encapsulation header. 452 * 453 * On exit, the transport header will be set to the start of the 454 * encapsulation header to be filled in by x->type->output and 455 * the mac header will be set to the nextheader (protocol for 456 * IPv4) field of the extension header directly preceding the 457 * encapsulation header, or in its absence, that of the top IP 458 * header. The value of the network header will always point 459 * to the top IP header while skb->data will point to the payload. 460 */ 461 int (*output2)(struct xfrm_state *x,struct sk_buff *skb); 462 463 /* 464 * This is the actual output entry point. 465 * 466 * For transport mode and equivalent this would be identical to 467 * output2 (which does not need to be set). While tunnel mode 468 * and equivalent would set this to a tunnel encapsulation function 469 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn 470 * call output2. 471 */ 472 int (*output)(struct xfrm_state *x, struct sk_buff *skb); 473 474 /* 475 * Adjust pointers into the packet and do GSO segmentation. 476 */ 477 struct sk_buff *(*gso_segment)(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features); 478 479 /* 480 * Adjust pointers into the packet when IPsec is done at layer2. 481 */ 482 void (*xmit)(struct xfrm_state *x, struct sk_buff *skb); 483 484 struct xfrm_state_afinfo *afinfo; 485 struct module *owner; 486 unsigned int encap; 487 int flags; 488 }; 489 490 /* Flags for xfrm_mode. */ 491 enum { 492 XFRM_MODE_FLAG_TUNNEL = 1, 493 }; 494 495 int xfrm_register_mode(struct xfrm_mode *mode, int family); 496 int xfrm_unregister_mode(struct xfrm_mode *mode, int family); 497 498 static inline int xfrm_af2proto(unsigned int family) 499 { 500 switch(family) { 501 case AF_INET: 502 return IPPROTO_IPIP; 503 case AF_INET6: 504 return IPPROTO_IPV6; 505 default: 506 return 0; 507 } 508 } 509 510 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto) 511 { 512 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) || 513 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6)) 514 return x->inner_mode; 515 else 516 return x->inner_mode_iaf; 517 } 518 519 struct xfrm_tmpl { 520 /* id in template is interpreted as: 521 * daddr - destination of tunnel, may be zero for transport mode. 522 * spi - zero to acquire spi. Not zero if spi is static, then 523 * daddr must be fixed too. 524 * proto - AH/ESP/IPCOMP 525 */ 526 struct xfrm_id id; 527 528 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 529 xfrm_address_t saddr; 530 531 unsigned short encap_family; 532 533 u32 reqid; 534 535 /* Mode: transport, tunnel etc. */ 536 u8 mode; 537 538 /* Sharing mode: unique, this session only, this user only etc. */ 539 u8 share; 540 541 /* May skip this transfomration if no SA is found */ 542 u8 optional; 543 544 /* Skip aalgos/ealgos/calgos checks. */ 545 u8 allalgs; 546 547 /* Bit mask of algos allowed for acquisition */ 548 u32 aalgos; 549 u32 ealgos; 550 u32 calgos; 551 }; 552 553 #define XFRM_MAX_DEPTH 6 554 #define XFRM_MAX_OFFLOAD_DEPTH 1 555 556 struct xfrm_policy_walk_entry { 557 struct list_head all; 558 u8 dead; 559 }; 560 561 struct xfrm_policy_walk { 562 struct xfrm_policy_walk_entry walk; 563 u8 type; 564 u32 seq; 565 }; 566 567 struct xfrm_policy_queue { 568 struct sk_buff_head hold_queue; 569 struct timer_list hold_timer; 570 unsigned long timeout; 571 }; 572 573 struct xfrm_policy { 574 possible_net_t xp_net; 575 struct hlist_node bydst; 576 struct hlist_node byidx; 577 578 /* This lock only affects elements except for entry. */ 579 rwlock_t lock; 580 refcount_t refcnt; 581 u32 pos; 582 struct timer_list timer; 583 584 atomic_t genid; 585 u32 priority; 586 u32 index; 587 u32 if_id; 588 struct xfrm_mark mark; 589 struct xfrm_selector selector; 590 struct xfrm_lifetime_cfg lft; 591 struct xfrm_lifetime_cur curlft; 592 struct xfrm_policy_walk_entry walk; 593 struct xfrm_policy_queue polq; 594 bool bydst_reinsert; 595 u8 type; 596 u8 action; 597 u8 flags; 598 u8 xfrm_nr; 599 u16 family; 600 struct xfrm_sec_ctx *security; 601 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 602 struct hlist_node bydst_inexact_list; 603 struct rcu_head rcu; 604 }; 605 606 static inline struct net *xp_net(const struct xfrm_policy *xp) 607 { 608 return read_pnet(&xp->xp_net); 609 } 610 611 struct xfrm_kmaddress { 612 xfrm_address_t local; 613 xfrm_address_t remote; 614 u32 reserved; 615 u16 family; 616 }; 617 618 struct xfrm_migrate { 619 xfrm_address_t old_daddr; 620 xfrm_address_t old_saddr; 621 xfrm_address_t new_daddr; 622 xfrm_address_t new_saddr; 623 u8 proto; 624 u8 mode; 625 u16 reserved; 626 u32 reqid; 627 u16 old_family; 628 u16 new_family; 629 }; 630 631 #define XFRM_KM_TIMEOUT 30 632 /* what happened */ 633 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 634 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 635 636 /* default aevent timeout in units of 100ms */ 637 #define XFRM_AE_ETIME 10 638 /* Async Event timer multiplier */ 639 #define XFRM_AE_ETH_M 10 640 /* default seq threshold size */ 641 #define XFRM_AE_SEQT_SIZE 2 642 643 struct xfrm_mgr { 644 struct list_head list; 645 int (*notify)(struct xfrm_state *x, const struct km_event *c); 646 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp); 647 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 648 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 649 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c); 650 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 651 int (*migrate)(const struct xfrm_selector *sel, 652 u8 dir, u8 type, 653 const struct xfrm_migrate *m, 654 int num_bundles, 655 const struct xfrm_kmaddress *k, 656 const struct xfrm_encap_tmpl *encap); 657 bool (*is_alive)(const struct km_event *c); 658 }; 659 660 int xfrm_register_km(struct xfrm_mgr *km); 661 int xfrm_unregister_km(struct xfrm_mgr *km); 662 663 struct xfrm_tunnel_skb_cb { 664 union { 665 struct inet_skb_parm h4; 666 struct inet6_skb_parm h6; 667 } header; 668 669 union { 670 struct ip_tunnel *ip4; 671 struct ip6_tnl *ip6; 672 } tunnel; 673 }; 674 675 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0])) 676 677 /* 678 * This structure is used for the duration where packets are being 679 * transformed by IPsec. As soon as the packet leaves IPsec the 680 * area beyond the generic IP part may be overwritten. 681 */ 682 struct xfrm_skb_cb { 683 struct xfrm_tunnel_skb_cb header; 684 685 /* Sequence number for replay protection. */ 686 union { 687 struct { 688 __u32 low; 689 __u32 hi; 690 } output; 691 struct { 692 __be32 low; 693 __be32 hi; 694 } input; 695 } seq; 696 }; 697 698 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) 699 700 /* 701 * This structure is used by the afinfo prepare_input/prepare_output functions 702 * to transmit header information to the mode input/output functions. 703 */ 704 struct xfrm_mode_skb_cb { 705 struct xfrm_tunnel_skb_cb header; 706 707 /* Copied from header for IPv4, always set to zero and DF for IPv6. */ 708 __be16 id; 709 __be16 frag_off; 710 711 /* IP header length (excluding options or extension headers). */ 712 u8 ihl; 713 714 /* TOS for IPv4, class for IPv6. */ 715 u8 tos; 716 717 /* TTL for IPv4, hop limitfor IPv6. */ 718 u8 ttl; 719 720 /* Protocol for IPv4, NH for IPv6. */ 721 u8 protocol; 722 723 /* Option length for IPv4, zero for IPv6. */ 724 u8 optlen; 725 726 /* Used by IPv6 only, zero for IPv4. */ 727 u8 flow_lbl[3]; 728 }; 729 730 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0])) 731 732 /* 733 * This structure is used by the input processing to locate the SPI and 734 * related information. 735 */ 736 struct xfrm_spi_skb_cb { 737 struct xfrm_tunnel_skb_cb header; 738 739 unsigned int daddroff; 740 unsigned int family; 741 __be32 seq; 742 }; 743 744 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0])) 745 746 #ifdef CONFIG_AUDITSYSCALL 747 static inline struct audit_buffer *xfrm_audit_start(const char *op) 748 { 749 struct audit_buffer *audit_buf = NULL; 750 751 if (audit_enabled == AUDIT_OFF) 752 return NULL; 753 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC, 754 AUDIT_MAC_IPSEC_EVENT); 755 if (audit_buf == NULL) 756 return NULL; 757 audit_log_format(audit_buf, "op=%s", op); 758 return audit_buf; 759 } 760 761 static inline void xfrm_audit_helper_usrinfo(bool task_valid, 762 struct audit_buffer *audit_buf) 763 { 764 const unsigned int auid = from_kuid(&init_user_ns, task_valid ? 765 audit_get_loginuid(current) : 766 INVALID_UID); 767 const unsigned int ses = task_valid ? audit_get_sessionid(current) : 768 AUDIT_SID_UNSET; 769 770 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses); 771 audit_log_task_context(audit_buf); 772 } 773 774 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid); 775 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 776 bool task_valid); 777 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid); 778 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid); 779 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 780 struct sk_buff *skb); 781 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb, 782 __be32 net_seq); 783 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family); 784 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi, 785 __be32 net_seq); 786 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb, 787 u8 proto); 788 #else 789 790 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 791 bool task_valid) 792 { 793 } 794 795 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 796 bool task_valid) 797 { 798 } 799 800 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result, 801 bool task_valid) 802 { 803 } 804 805 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result, 806 bool task_valid) 807 { 808 } 809 810 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 811 struct sk_buff *skb) 812 { 813 } 814 815 static inline void xfrm_audit_state_replay(struct xfrm_state *x, 816 struct sk_buff *skb, __be32 net_seq) 817 { 818 } 819 820 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb, 821 u16 family) 822 { 823 } 824 825 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 826 __be32 net_spi, __be32 net_seq) 827 { 828 } 829 830 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x, 831 struct sk_buff *skb, u8 proto) 832 { 833 } 834 #endif /* CONFIG_AUDITSYSCALL */ 835 836 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 837 { 838 if (likely(policy != NULL)) 839 refcount_inc(&policy->refcnt); 840 } 841 842 void xfrm_policy_destroy(struct xfrm_policy *policy); 843 844 static inline void xfrm_pol_put(struct xfrm_policy *policy) 845 { 846 if (refcount_dec_and_test(&policy->refcnt)) 847 xfrm_policy_destroy(policy); 848 } 849 850 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 851 { 852 int i; 853 for (i = npols - 1; i >= 0; --i) 854 xfrm_pol_put(pols[i]); 855 } 856 857 void __xfrm_state_destroy(struct xfrm_state *, bool); 858 859 static inline void __xfrm_state_put(struct xfrm_state *x) 860 { 861 refcount_dec(&x->refcnt); 862 } 863 864 static inline void xfrm_state_put(struct xfrm_state *x) 865 { 866 if (refcount_dec_and_test(&x->refcnt)) 867 __xfrm_state_destroy(x, false); 868 } 869 870 static inline void xfrm_state_put_sync(struct xfrm_state *x) 871 { 872 if (refcount_dec_and_test(&x->refcnt)) 873 __xfrm_state_destroy(x, true); 874 } 875 876 static inline void xfrm_state_hold(struct xfrm_state *x) 877 { 878 refcount_inc(&x->refcnt); 879 } 880 881 static inline bool addr_match(const void *token1, const void *token2, 882 unsigned int prefixlen) 883 { 884 const __be32 *a1 = token1; 885 const __be32 *a2 = token2; 886 unsigned int pdw; 887 unsigned int pbi; 888 889 pdw = prefixlen >> 5; /* num of whole u32 in prefix */ 890 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 891 892 if (pdw) 893 if (memcmp(a1, a2, pdw << 2)) 894 return false; 895 896 if (pbi) { 897 __be32 mask; 898 899 mask = htonl((0xffffffff) << (32 - pbi)); 900 901 if ((a1[pdw] ^ a2[pdw]) & mask) 902 return false; 903 } 904 905 return true; 906 } 907 908 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen) 909 { 910 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */ 911 if (sizeof(long) == 4 && prefixlen == 0) 912 return true; 913 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen))); 914 } 915 916 static __inline__ 917 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli) 918 { 919 __be16 port; 920 switch(fl->flowi_proto) { 921 case IPPROTO_TCP: 922 case IPPROTO_UDP: 923 case IPPROTO_UDPLITE: 924 case IPPROTO_SCTP: 925 port = uli->ports.sport; 926 break; 927 case IPPROTO_ICMP: 928 case IPPROTO_ICMPV6: 929 port = htons(uli->icmpt.type); 930 break; 931 case IPPROTO_MH: 932 port = htons(uli->mht.type); 933 break; 934 case IPPROTO_GRE: 935 port = htons(ntohl(uli->gre_key) >> 16); 936 break; 937 default: 938 port = 0; /*XXX*/ 939 } 940 return port; 941 } 942 943 static __inline__ 944 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli) 945 { 946 __be16 port; 947 switch(fl->flowi_proto) { 948 case IPPROTO_TCP: 949 case IPPROTO_UDP: 950 case IPPROTO_UDPLITE: 951 case IPPROTO_SCTP: 952 port = uli->ports.dport; 953 break; 954 case IPPROTO_ICMP: 955 case IPPROTO_ICMPV6: 956 port = htons(uli->icmpt.code); 957 break; 958 case IPPROTO_GRE: 959 port = htons(ntohl(uli->gre_key) & 0xffff); 960 break; 961 default: 962 port = 0; /*XXX*/ 963 } 964 return port; 965 } 966 967 bool xfrm_selector_match(const struct xfrm_selector *sel, 968 const struct flowi *fl, unsigned short family); 969 970 #ifdef CONFIG_SECURITY_NETWORK_XFRM 971 /* If neither has a context --> match 972 * Otherwise, both must have a context and the sids, doi, alg must match 973 */ 974 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 975 { 976 return ((!s1 && !s2) || 977 (s1 && s2 && 978 (s1->ctx_sid == s2->ctx_sid) && 979 (s1->ctx_doi == s2->ctx_doi) && 980 (s1->ctx_alg == s2->ctx_alg))); 981 } 982 #else 983 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 984 { 985 return true; 986 } 987 #endif 988 989 /* A struct encoding bundle of transformations to apply to some set of flow. 990 * 991 * xdst->child points to the next element of bundle. 992 * dst->xfrm points to an instanse of transformer. 993 * 994 * Due to unfortunate limitations of current routing cache, which we 995 * have no time to fix, it mirrors struct rtable and bound to the same 996 * routing key, including saddr,daddr. However, we can have many of 997 * bundles differing by session id. All the bundles grow from a parent 998 * policy rule. 999 */ 1000 struct xfrm_dst { 1001 union { 1002 struct dst_entry dst; 1003 struct rtable rt; 1004 struct rt6_info rt6; 1005 } u; 1006 struct dst_entry *route; 1007 struct dst_entry *child; 1008 struct dst_entry *path; 1009 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; 1010 int num_pols, num_xfrms; 1011 u32 xfrm_genid; 1012 u32 policy_genid; 1013 u32 route_mtu_cached; 1014 u32 child_mtu_cached; 1015 u32 route_cookie; 1016 u32 path_cookie; 1017 }; 1018 1019 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst) 1020 { 1021 #ifdef CONFIG_XFRM 1022 if (dst->xfrm) { 1023 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst; 1024 1025 return xdst->path; 1026 } 1027 #endif 1028 return (struct dst_entry *) dst; 1029 } 1030 1031 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst) 1032 { 1033 #ifdef CONFIG_XFRM 1034 if (dst->xfrm) { 1035 struct xfrm_dst *xdst = (struct xfrm_dst *) dst; 1036 return xdst->child; 1037 } 1038 #endif 1039 return NULL; 1040 } 1041 1042 #ifdef CONFIG_XFRM 1043 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child) 1044 { 1045 xdst->child = child; 1046 } 1047 1048 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 1049 { 1050 xfrm_pols_put(xdst->pols, xdst->num_pols); 1051 dst_release(xdst->route); 1052 if (likely(xdst->u.dst.xfrm)) 1053 xfrm_state_put(xdst->u.dst.xfrm); 1054 } 1055 #endif 1056 1057 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 1058 1059 struct xfrm_if_parms { 1060 char name[IFNAMSIZ]; /* name of XFRM device */ 1061 int link; /* ifindex of underlying L2 interface */ 1062 u32 if_id; /* interface identifyer */ 1063 }; 1064 1065 struct xfrm_if { 1066 struct xfrm_if __rcu *next; /* next interface in list */ 1067 struct net_device *dev; /* virtual device associated with interface */ 1068 struct net_device *phydev; /* physical device */ 1069 struct net *net; /* netns for packet i/o */ 1070 struct xfrm_if_parms p; /* interface parms */ 1071 1072 struct gro_cells gro_cells; 1073 }; 1074 1075 struct xfrm_offload { 1076 /* Output sequence number for replay protection on offloading. */ 1077 struct { 1078 __u32 low; 1079 __u32 hi; 1080 } seq; 1081 1082 __u32 flags; 1083 #define SA_DELETE_REQ 1 1084 #define CRYPTO_DONE 2 1085 #define CRYPTO_NEXT_DONE 4 1086 #define CRYPTO_FALLBACK 8 1087 #define XFRM_GSO_SEGMENT 16 1088 #define XFRM_GRO 32 1089 #define XFRM_ESP_NO_TRAILER 64 1090 #define XFRM_DEV_RESUME 128 1091 1092 __u32 status; 1093 #define CRYPTO_SUCCESS 1 1094 #define CRYPTO_GENERIC_ERROR 2 1095 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4 1096 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8 1097 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16 1098 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32 1099 #define CRYPTO_INVALID_PACKET_SYNTAX 64 1100 #define CRYPTO_INVALID_PROTOCOL 128 1101 1102 __u8 proto; 1103 }; 1104 1105 struct sec_path { 1106 int len; 1107 int olen; 1108 1109 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 1110 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH]; 1111 }; 1112 1113 struct sec_path *secpath_set(struct sk_buff *skb); 1114 1115 static inline void 1116 secpath_reset(struct sk_buff *skb) 1117 { 1118 #ifdef CONFIG_XFRM 1119 skb_ext_del(skb, SKB_EXT_SEC_PATH); 1120 #endif 1121 } 1122 1123 static inline int 1124 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family) 1125 { 1126 switch (family) { 1127 case AF_INET: 1128 return addr->a4 == 0; 1129 case AF_INET6: 1130 return ipv6_addr_any(&addr->in6); 1131 } 1132 return 0; 1133 } 1134 1135 static inline int 1136 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1137 { 1138 return (tmpl->saddr.a4 && 1139 tmpl->saddr.a4 != x->props.saddr.a4); 1140 } 1141 1142 static inline int 1143 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1144 { 1145 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 1146 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 1147 } 1148 1149 static inline int 1150 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family) 1151 { 1152 switch (family) { 1153 case AF_INET: 1154 return __xfrm4_state_addr_cmp(tmpl, x); 1155 case AF_INET6: 1156 return __xfrm6_state_addr_cmp(tmpl, x); 1157 } 1158 return !0; 1159 } 1160 1161 #ifdef CONFIG_XFRM 1162 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, 1163 unsigned short family); 1164 1165 static inline int __xfrm_policy_check2(struct sock *sk, int dir, 1166 struct sk_buff *skb, 1167 unsigned int family, int reverse) 1168 { 1169 struct net *net = dev_net(skb->dev); 1170 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); 1171 1172 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 1173 return __xfrm_policy_check(sk, ndir, skb, family); 1174 1175 return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) || 1176 (skb_dst(skb)->flags & DST_NOPOLICY) || 1177 __xfrm_policy_check(sk, ndir, skb, family); 1178 } 1179 1180 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1181 { 1182 return __xfrm_policy_check2(sk, dir, skb, family, 0); 1183 } 1184 1185 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1186 { 1187 return xfrm_policy_check(sk, dir, skb, AF_INET); 1188 } 1189 1190 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1191 { 1192 return xfrm_policy_check(sk, dir, skb, AF_INET6); 1193 } 1194 1195 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1196 struct sk_buff *skb) 1197 { 1198 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); 1199 } 1200 1201 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1202 struct sk_buff *skb) 1203 { 1204 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); 1205 } 1206 1207 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1208 unsigned int family, int reverse); 1209 1210 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1211 unsigned int family) 1212 { 1213 return __xfrm_decode_session(skb, fl, family, 0); 1214 } 1215 1216 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1217 struct flowi *fl, 1218 unsigned int family) 1219 { 1220 return __xfrm_decode_session(skb, fl, family, 1); 1221 } 1222 1223 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 1224 1225 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 1226 { 1227 struct net *net = dev_net(skb->dev); 1228 1229 return !net->xfrm.policy_count[XFRM_POLICY_OUT] || 1230 (skb_dst(skb)->flags & DST_NOXFRM) || 1231 __xfrm_route_forward(skb, family); 1232 } 1233 1234 static inline int xfrm4_route_forward(struct sk_buff *skb) 1235 { 1236 return xfrm_route_forward(skb, AF_INET); 1237 } 1238 1239 static inline int xfrm6_route_forward(struct sk_buff *skb) 1240 { 1241 return xfrm_route_forward(skb, AF_INET6); 1242 } 1243 1244 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk); 1245 1246 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) 1247 { 1248 sk->sk_policy[0] = NULL; 1249 sk->sk_policy[1] = NULL; 1250 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1])) 1251 return __xfrm_sk_clone_policy(sk, osk); 1252 return 0; 1253 } 1254 1255 int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 1256 1257 static inline void xfrm_sk_free_policy(struct sock *sk) 1258 { 1259 struct xfrm_policy *pol; 1260 1261 pol = rcu_dereference_protected(sk->sk_policy[0], 1); 1262 if (unlikely(pol != NULL)) { 1263 xfrm_policy_delete(pol, XFRM_POLICY_MAX); 1264 sk->sk_policy[0] = NULL; 1265 } 1266 pol = rcu_dereference_protected(sk->sk_policy[1], 1); 1267 if (unlikely(pol != NULL)) { 1268 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1); 1269 sk->sk_policy[1] = NULL; 1270 } 1271 } 1272 1273 #else 1274 1275 static inline void xfrm_sk_free_policy(struct sock *sk) {} 1276 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; } 1277 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 1278 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 1279 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1280 { 1281 return 1; 1282 } 1283 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1284 { 1285 return 1; 1286 } 1287 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1288 { 1289 return 1; 1290 } 1291 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1292 struct flowi *fl, 1293 unsigned int family) 1294 { 1295 return -ENOSYS; 1296 } 1297 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1298 struct sk_buff *skb) 1299 { 1300 return 1; 1301 } 1302 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1303 struct sk_buff *skb) 1304 { 1305 return 1; 1306 } 1307 #endif 1308 1309 static __inline__ 1310 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family) 1311 { 1312 switch (family){ 1313 case AF_INET: 1314 return (xfrm_address_t *)&fl->u.ip4.daddr; 1315 case AF_INET6: 1316 return (xfrm_address_t *)&fl->u.ip6.daddr; 1317 } 1318 return NULL; 1319 } 1320 1321 static __inline__ 1322 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family) 1323 { 1324 switch (family){ 1325 case AF_INET: 1326 return (xfrm_address_t *)&fl->u.ip4.saddr; 1327 case AF_INET6: 1328 return (xfrm_address_t *)&fl->u.ip6.saddr; 1329 } 1330 return NULL; 1331 } 1332 1333 static __inline__ 1334 void xfrm_flowi_addr_get(const struct flowi *fl, 1335 xfrm_address_t *saddr, xfrm_address_t *daddr, 1336 unsigned short family) 1337 { 1338 switch(family) { 1339 case AF_INET: 1340 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4)); 1341 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4)); 1342 break; 1343 case AF_INET6: 1344 saddr->in6 = fl->u.ip6.saddr; 1345 daddr->in6 = fl->u.ip6.daddr; 1346 break; 1347 } 1348 } 1349 1350 static __inline__ int 1351 __xfrm4_state_addr_check(const struct xfrm_state *x, 1352 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1353 { 1354 if (daddr->a4 == x->id.daddr.a4 && 1355 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 1356 return 1; 1357 return 0; 1358 } 1359 1360 static __inline__ int 1361 __xfrm6_state_addr_check(const struct xfrm_state *x, 1362 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1363 { 1364 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 1365 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) || 1366 ipv6_addr_any((struct in6_addr *)saddr) || 1367 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 1368 return 1; 1369 return 0; 1370 } 1371 1372 static __inline__ int 1373 xfrm_state_addr_check(const struct xfrm_state *x, 1374 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1375 unsigned short family) 1376 { 1377 switch (family) { 1378 case AF_INET: 1379 return __xfrm4_state_addr_check(x, daddr, saddr); 1380 case AF_INET6: 1381 return __xfrm6_state_addr_check(x, daddr, saddr); 1382 } 1383 return 0; 1384 } 1385 1386 static __inline__ int 1387 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl, 1388 unsigned short family) 1389 { 1390 switch (family) { 1391 case AF_INET: 1392 return __xfrm4_state_addr_check(x, 1393 (const xfrm_address_t *)&fl->u.ip4.daddr, 1394 (const xfrm_address_t *)&fl->u.ip4.saddr); 1395 case AF_INET6: 1396 return __xfrm6_state_addr_check(x, 1397 (const xfrm_address_t *)&fl->u.ip6.daddr, 1398 (const xfrm_address_t *)&fl->u.ip6.saddr); 1399 } 1400 return 0; 1401 } 1402 1403 static inline int xfrm_state_kern(const struct xfrm_state *x) 1404 { 1405 return atomic_read(&x->tunnel_users); 1406 } 1407 1408 static inline bool xfrm_id_proto_valid(u8 proto) 1409 { 1410 switch (proto) { 1411 case IPPROTO_AH: 1412 case IPPROTO_ESP: 1413 case IPPROTO_COMP: 1414 #if IS_ENABLED(CONFIG_IPV6) 1415 case IPPROTO_ROUTING: 1416 case IPPROTO_DSTOPTS: 1417 #endif 1418 return true; 1419 default: 1420 return false; 1421 } 1422 } 1423 1424 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */ 1425 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 1426 { 1427 return (!userproto || proto == userproto || 1428 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 1429 proto == IPPROTO_ESP || 1430 proto == IPPROTO_COMP))); 1431 } 1432 1433 /* 1434 * xfrm algorithm information 1435 */ 1436 struct xfrm_algo_aead_info { 1437 char *geniv; 1438 u16 icv_truncbits; 1439 }; 1440 1441 struct xfrm_algo_auth_info { 1442 u16 icv_truncbits; 1443 u16 icv_fullbits; 1444 }; 1445 1446 struct xfrm_algo_encr_info { 1447 char *geniv; 1448 u16 blockbits; 1449 u16 defkeybits; 1450 }; 1451 1452 struct xfrm_algo_comp_info { 1453 u16 threshold; 1454 }; 1455 1456 struct xfrm_algo_desc { 1457 char *name; 1458 char *compat; 1459 u8 available:1; 1460 u8 pfkey_supported:1; 1461 union { 1462 struct xfrm_algo_aead_info aead; 1463 struct xfrm_algo_auth_info auth; 1464 struct xfrm_algo_encr_info encr; 1465 struct xfrm_algo_comp_info comp; 1466 } uinfo; 1467 struct sadb_alg desc; 1468 }; 1469 1470 /* XFRM protocol handlers. */ 1471 struct xfrm4_protocol { 1472 int (*handler)(struct sk_buff *skb); 1473 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1474 int encap_type); 1475 int (*cb_handler)(struct sk_buff *skb, int err); 1476 int (*err_handler)(struct sk_buff *skb, u32 info); 1477 1478 struct xfrm4_protocol __rcu *next; 1479 int priority; 1480 }; 1481 1482 struct xfrm6_protocol { 1483 int (*handler)(struct sk_buff *skb); 1484 int (*cb_handler)(struct sk_buff *skb, int err); 1485 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1486 u8 type, u8 code, int offset, __be32 info); 1487 1488 struct xfrm6_protocol __rcu *next; 1489 int priority; 1490 }; 1491 1492 /* XFRM tunnel handlers. */ 1493 struct xfrm_tunnel { 1494 int (*handler)(struct sk_buff *skb); 1495 int (*err_handler)(struct sk_buff *skb, u32 info); 1496 1497 struct xfrm_tunnel __rcu *next; 1498 int priority; 1499 }; 1500 1501 struct xfrm6_tunnel { 1502 int (*handler)(struct sk_buff *skb); 1503 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1504 u8 type, u8 code, int offset, __be32 info); 1505 struct xfrm6_tunnel __rcu *next; 1506 int priority; 1507 }; 1508 1509 void xfrm_init(void); 1510 void xfrm4_init(void); 1511 int xfrm_state_init(struct net *net); 1512 void xfrm_state_fini(struct net *net); 1513 void xfrm4_state_init(void); 1514 void xfrm4_protocol_init(void); 1515 #ifdef CONFIG_XFRM 1516 int xfrm6_init(void); 1517 void xfrm6_fini(void); 1518 int xfrm6_state_init(void); 1519 void xfrm6_state_fini(void); 1520 int xfrm6_protocol_init(void); 1521 void xfrm6_protocol_fini(void); 1522 #else 1523 static inline int xfrm6_init(void) 1524 { 1525 return 0; 1526 } 1527 static inline void xfrm6_fini(void) 1528 { 1529 ; 1530 } 1531 #endif 1532 1533 #ifdef CONFIG_XFRM_STATISTICS 1534 int xfrm_proc_init(struct net *net); 1535 void xfrm_proc_fini(struct net *net); 1536 #endif 1537 1538 int xfrm_sysctl_init(struct net *net); 1539 #ifdef CONFIG_SYSCTL 1540 void xfrm_sysctl_fini(struct net *net); 1541 #else 1542 static inline void xfrm_sysctl_fini(struct net *net) 1543 { 1544 } 1545 #endif 1546 1547 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 1548 struct xfrm_address_filter *filter); 1549 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1550 int (*func)(struct xfrm_state *, int, void*), void *); 1551 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net); 1552 struct xfrm_state *xfrm_state_alloc(struct net *net); 1553 void xfrm_state_free(struct xfrm_state *x); 1554 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr, 1555 const xfrm_address_t *saddr, 1556 const struct flowi *fl, 1557 struct xfrm_tmpl *tmpl, 1558 struct xfrm_policy *pol, int *err, 1559 unsigned short family, u32 if_id); 1560 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id, 1561 xfrm_address_t *daddr, 1562 xfrm_address_t *saddr, 1563 unsigned short family, 1564 u8 mode, u8 proto, u32 reqid); 1565 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1566 unsigned short family); 1567 int xfrm_state_check_expire(struct xfrm_state *x); 1568 void xfrm_state_insert(struct xfrm_state *x); 1569 int xfrm_state_add(struct xfrm_state *x); 1570 int xfrm_state_update(struct xfrm_state *x); 1571 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark, 1572 const xfrm_address_t *daddr, __be32 spi, 1573 u8 proto, unsigned short family); 1574 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1575 const xfrm_address_t *daddr, 1576 const xfrm_address_t *saddr, 1577 u8 proto, 1578 unsigned short family); 1579 #ifdef CONFIG_XFRM_SUB_POLICY 1580 int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1581 unsigned short family, struct net *net); 1582 int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1583 unsigned short family); 1584 #else 1585 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 1586 int n, unsigned short family, struct net *net) 1587 { 1588 return -ENOSYS; 1589 } 1590 1591 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 1592 int n, unsigned short family) 1593 { 1594 return -ENOSYS; 1595 } 1596 #endif 1597 1598 struct xfrmk_sadinfo { 1599 u32 sadhcnt; /* current hash bkts */ 1600 u32 sadhmcnt; /* max allowed hash bkts */ 1601 u32 sadcnt; /* current running count */ 1602 }; 1603 1604 struct xfrmk_spdinfo { 1605 u32 incnt; 1606 u32 outcnt; 1607 u32 fwdcnt; 1608 u32 inscnt; 1609 u32 outscnt; 1610 u32 fwdscnt; 1611 u32 spdhcnt; 1612 u32 spdhmcnt; 1613 }; 1614 1615 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1616 int xfrm_state_delete(struct xfrm_state *x); 1617 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync); 1618 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid); 1619 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); 1620 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); 1621 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq); 1622 int xfrm_init_replay(struct xfrm_state *x); 1623 int xfrm_state_mtu(struct xfrm_state *x, int mtu); 1624 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload); 1625 int xfrm_init_state(struct xfrm_state *x); 1626 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb); 1627 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type); 1628 int xfrm_input_resume(struct sk_buff *skb, int nexthdr); 1629 int xfrm_trans_queue(struct sk_buff *skb, 1630 int (*finish)(struct net *, struct sock *, 1631 struct sk_buff *)); 1632 int xfrm_output_resume(struct sk_buff *skb, int err); 1633 int xfrm_output(struct sock *sk, struct sk_buff *skb); 1634 int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1635 void xfrm_local_error(struct sk_buff *skb, int mtu); 1636 int xfrm4_extract_header(struct sk_buff *skb); 1637 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1638 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1639 int encap_type); 1640 int xfrm4_transport_finish(struct sk_buff *skb, int async); 1641 int xfrm4_rcv(struct sk_buff *skb); 1642 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1643 1644 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1645 { 1646 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL; 1647 XFRM_SPI_SKB_CB(skb)->family = AF_INET; 1648 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); 1649 return xfrm_input(skb, nexthdr, spi, 0); 1650 } 1651 1652 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1653 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb); 1654 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1655 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb); 1656 int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err); 1657 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol); 1658 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol); 1659 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1660 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1661 void xfrm4_local_error(struct sk_buff *skb, u32 mtu); 1662 int xfrm6_extract_header(struct sk_buff *skb); 1663 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1664 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi, 1665 struct ip6_tnl *t); 1666 int xfrm6_transport_finish(struct sk_buff *skb, int async); 1667 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t); 1668 int xfrm6_rcv(struct sk_buff *skb); 1669 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1670 xfrm_address_t *saddr, u8 proto); 1671 void xfrm6_local_error(struct sk_buff *skb, u32 mtu); 1672 int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err); 1673 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol); 1674 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol); 1675 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1676 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1677 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr); 1678 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr); 1679 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1680 int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb); 1681 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1682 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb); 1683 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, 1684 u8 **prevhdr); 1685 1686 #ifdef CONFIG_XFRM 1687 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1688 int xfrm_user_policy(struct sock *sk, int optname, 1689 u8 __user *optval, int optlen); 1690 #else 1691 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 1692 { 1693 return -ENOPROTOOPT; 1694 } 1695 1696 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb) 1697 { 1698 /* should not happen */ 1699 kfree_skb(skb); 1700 return 0; 1701 } 1702 #endif 1703 1704 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif, 1705 const xfrm_address_t *saddr, 1706 const xfrm_address_t *daddr, 1707 int family, u32 mark); 1708 1709 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); 1710 1711 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); 1712 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, 1713 int (*func)(struct xfrm_policy *, int, int, void*), 1714 void *); 1715 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net); 1716 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1717 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u32 if_id, 1718 u8 type, int dir, 1719 struct xfrm_selector *sel, 1720 struct xfrm_sec_ctx *ctx, int delete, 1721 int *err); 1722 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u32 if_id, u8, 1723 int dir, u32 id, int delete, int *err); 1724 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid); 1725 void xfrm_policy_hash_rebuild(struct net *net); 1726 u32 xfrm_get_acqseq(void); 1727 int verify_spi_info(u8 proto, u32 min, u32 max); 1728 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 1729 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, 1730 u8 mode, u32 reqid, u32 if_id, u8 proto, 1731 const xfrm_address_t *daddr, 1732 const xfrm_address_t *saddr, int create, 1733 unsigned short family); 1734 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1735 1736 #ifdef CONFIG_XFRM_MIGRATE 1737 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1738 const struct xfrm_migrate *m, int num_bundles, 1739 const struct xfrm_kmaddress *k, 1740 const struct xfrm_encap_tmpl *encap); 1741 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net); 1742 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 1743 struct xfrm_migrate *m, 1744 struct xfrm_encap_tmpl *encap); 1745 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1746 struct xfrm_migrate *m, int num_bundles, 1747 struct xfrm_kmaddress *k, struct net *net, 1748 struct xfrm_encap_tmpl *encap); 1749 #endif 1750 1751 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1752 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid); 1753 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, 1754 xfrm_address_t *addr); 1755 1756 void xfrm_input_init(void); 1757 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1758 1759 void xfrm_probe_algs(void); 1760 int xfrm_count_pfkey_auth_supported(void); 1761 int xfrm_count_pfkey_enc_supported(void); 1762 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1763 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1764 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1765 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1766 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1767 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe); 1768 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe); 1769 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe); 1770 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, 1771 int probe); 1772 1773 static inline bool xfrm6_addr_equal(const xfrm_address_t *a, 1774 const xfrm_address_t *b) 1775 { 1776 return ipv6_addr_equal((const struct in6_addr *)a, 1777 (const struct in6_addr *)b); 1778 } 1779 1780 static inline bool xfrm_addr_equal(const xfrm_address_t *a, 1781 const xfrm_address_t *b, 1782 sa_family_t family) 1783 { 1784 switch (family) { 1785 default: 1786 case AF_INET: 1787 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0; 1788 case AF_INET6: 1789 return xfrm6_addr_equal(a, b); 1790 } 1791 } 1792 1793 static inline int xfrm_policy_id2dir(u32 index) 1794 { 1795 return index & 7; 1796 } 1797 1798 #ifdef CONFIG_XFRM 1799 static inline int xfrm_aevent_is_on(struct net *net) 1800 { 1801 struct sock *nlsk; 1802 int ret = 0; 1803 1804 rcu_read_lock(); 1805 nlsk = rcu_dereference(net->xfrm.nlsk); 1806 if (nlsk) 1807 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1808 rcu_read_unlock(); 1809 return ret; 1810 } 1811 1812 static inline int xfrm_acquire_is_on(struct net *net) 1813 { 1814 struct sock *nlsk; 1815 int ret = 0; 1816 1817 rcu_read_lock(); 1818 nlsk = rcu_dereference(net->xfrm.nlsk); 1819 if (nlsk) 1820 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE); 1821 rcu_read_unlock(); 1822 1823 return ret; 1824 } 1825 #endif 1826 1827 static inline unsigned int aead_len(struct xfrm_algo_aead *alg) 1828 { 1829 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1830 } 1831 1832 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg) 1833 { 1834 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1835 } 1836 1837 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg) 1838 { 1839 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1840 } 1841 1842 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn) 1843 { 1844 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32); 1845 } 1846 1847 #ifdef CONFIG_XFRM_MIGRATE 1848 static inline int xfrm_replay_clone(struct xfrm_state *x, 1849 struct xfrm_state *orig) 1850 { 1851 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn), 1852 GFP_KERNEL); 1853 if (!x->replay_esn) 1854 return -ENOMEM; 1855 1856 x->replay_esn->bmp_len = orig->replay_esn->bmp_len; 1857 x->replay_esn->replay_window = orig->replay_esn->replay_window; 1858 1859 x->preplay_esn = kmemdup(x->replay_esn, 1860 xfrm_replay_state_esn_len(x->replay_esn), 1861 GFP_KERNEL); 1862 if (!x->preplay_esn) { 1863 kfree(x->replay_esn); 1864 return -ENOMEM; 1865 } 1866 1867 return 0; 1868 } 1869 1870 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig) 1871 { 1872 return kmemdup(orig, aead_len(orig), GFP_KERNEL); 1873 } 1874 1875 1876 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1877 { 1878 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); 1879 } 1880 1881 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig) 1882 { 1883 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL); 1884 } 1885 1886 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1887 { 1888 int i; 1889 for (i = 0; i < n; i++) 1890 xfrm_state_put(*(states + i)); 1891 } 1892 1893 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1894 { 1895 int i; 1896 for (i = 0; i < n; i++) 1897 xfrm_state_delete(*(states + i)); 1898 } 1899 #endif 1900 1901 #ifdef CONFIG_XFRM 1902 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) 1903 { 1904 struct sec_path *sp = skb_sec_path(skb); 1905 1906 return sp->xvec[sp->len - 1]; 1907 } 1908 #endif 1909 1910 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb) 1911 { 1912 #ifdef CONFIG_XFRM 1913 struct sec_path *sp = skb_sec_path(skb); 1914 1915 if (!sp || !sp->olen || sp->len != sp->olen) 1916 return NULL; 1917 1918 return &sp->ovec[sp->olen - 1]; 1919 #else 1920 return NULL; 1921 #endif 1922 } 1923 1924 void __init xfrm_dev_init(void); 1925 1926 #ifdef CONFIG_XFRM_OFFLOAD 1927 void xfrm_dev_resume(struct sk_buff *skb); 1928 void xfrm_dev_backlog(struct softnet_data *sd); 1929 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again); 1930 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, 1931 struct xfrm_user_offload *xuo); 1932 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x); 1933 1934 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 1935 { 1936 struct xfrm_state_offload *xso = &x->xso; 1937 1938 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn) 1939 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x); 1940 } 1941 1942 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 1943 { 1944 struct xfrm_state *x = dst->xfrm; 1945 struct xfrm_dst *xdst; 1946 1947 if (!x || !x->type_offload) 1948 return false; 1949 1950 xdst = (struct xfrm_dst *) dst; 1951 if (!x->xso.offload_handle && !xdst->child->xfrm) 1952 return true; 1953 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) && 1954 !xdst->child->xfrm) 1955 return true; 1956 1957 return false; 1958 } 1959 1960 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 1961 { 1962 struct xfrm_state_offload *xso = &x->xso; 1963 1964 if (xso->dev) 1965 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x); 1966 } 1967 1968 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1969 { 1970 struct xfrm_state_offload *xso = &x->xso; 1971 struct net_device *dev = xso->dev; 1972 1973 if (dev && dev->xfrmdev_ops) { 1974 if (dev->xfrmdev_ops->xdo_dev_state_free) 1975 dev->xfrmdev_ops->xdo_dev_state_free(x); 1976 xso->dev = NULL; 1977 dev_put(dev); 1978 } 1979 } 1980 #else 1981 static inline void xfrm_dev_resume(struct sk_buff *skb) 1982 { 1983 } 1984 1985 static inline void xfrm_dev_backlog(struct softnet_data *sd) 1986 { 1987 } 1988 1989 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again) 1990 { 1991 return skb; 1992 } 1993 1994 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo) 1995 { 1996 return 0; 1997 } 1998 1999 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 2000 { 2001 } 2002 2003 static inline void xfrm_dev_state_free(struct xfrm_state *x) 2004 { 2005 } 2006 2007 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) 2008 { 2009 return false; 2010 } 2011 2012 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 2013 { 2014 } 2015 2016 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 2017 { 2018 return false; 2019 } 2020 #endif 2021 2022 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) 2023 { 2024 if (attrs[XFRMA_MARK]) 2025 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark)); 2026 else 2027 m->v = m->m = 0; 2028 2029 return m->v & m->m; 2030 } 2031 2032 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m) 2033 { 2034 int ret = 0; 2035 2036 if (m->m | m->v) 2037 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); 2038 return ret; 2039 } 2040 2041 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x) 2042 { 2043 struct xfrm_mark *m = &x->props.smark; 2044 2045 return (m->v & m->m) | (mark & ~m->m); 2046 } 2047 2048 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id) 2049 { 2050 int ret = 0; 2051 2052 if (if_id) 2053 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id); 2054 return ret; 2055 } 2056 2057 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x, 2058 unsigned int family) 2059 { 2060 bool tunnel = false; 2061 2062 switch(family) { 2063 case AF_INET: 2064 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) 2065 tunnel = true; 2066 break; 2067 case AF_INET6: 2068 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) 2069 tunnel = true; 2070 break; 2071 } 2072 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL)) 2073 return -EINVAL; 2074 2075 return 0; 2076 } 2077 #endif /* _NET_XFRM_H */ 2078