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 struct net_device *real_dev; 131 unsigned long offload_handle; 132 unsigned int num_exthdrs; 133 u8 flags; 134 }; 135 136 struct xfrm_mode { 137 u8 encap; 138 u8 family; 139 u8 flags; 140 }; 141 142 /* Flags for xfrm_mode. */ 143 enum { 144 XFRM_MODE_FLAG_TUNNEL = 1, 145 }; 146 147 /* Full description of state of transformer. */ 148 struct xfrm_state { 149 possible_net_t xs_net; 150 union { 151 struct hlist_node gclist; 152 struct hlist_node bydst; 153 }; 154 struct hlist_node bysrc; 155 struct hlist_node byspi; 156 157 refcount_t refcnt; 158 spinlock_t lock; 159 160 struct xfrm_id id; 161 struct xfrm_selector sel; 162 struct xfrm_mark mark; 163 u32 if_id; 164 u32 tfcpad; 165 166 u32 genid; 167 168 /* Key manager bits */ 169 struct xfrm_state_walk km; 170 171 /* Parameters of this state. */ 172 struct { 173 u32 reqid; 174 u8 mode; 175 u8 replay_window; 176 u8 aalgo, ealgo, calgo; 177 u8 flags; 178 u16 family; 179 xfrm_address_t saddr; 180 int header_len; 181 int trailer_len; 182 u32 extra_flags; 183 struct xfrm_mark smark; 184 } props; 185 186 struct xfrm_lifetime_cfg lft; 187 188 /* Data for transformer */ 189 struct xfrm_algo_auth *aalg; 190 struct xfrm_algo *ealg; 191 struct xfrm_algo *calg; 192 struct xfrm_algo_aead *aead; 193 const char *geniv; 194 195 /* Data for encapsulator */ 196 struct xfrm_encap_tmpl *encap; 197 struct sock __rcu *encap_sk; 198 199 /* Data for care-of address */ 200 xfrm_address_t *coaddr; 201 202 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 203 struct xfrm_state *tunnel; 204 205 /* If a tunnel, number of users + 1 */ 206 atomic_t tunnel_users; 207 208 /* State for replay detection */ 209 struct xfrm_replay_state replay; 210 struct xfrm_replay_state_esn *replay_esn; 211 212 /* Replay detection state at the time we sent the last notification */ 213 struct xfrm_replay_state preplay; 214 struct xfrm_replay_state_esn *preplay_esn; 215 216 /* The functions for replay detection. */ 217 const struct xfrm_replay *repl; 218 219 /* internal flag that only holds state for delayed aevent at the 220 * moment 221 */ 222 u32 xflags; 223 224 /* Replay detection notification settings */ 225 u32 replay_maxage; 226 u32 replay_maxdiff; 227 228 /* Replay detection notification timer */ 229 struct timer_list rtimer; 230 231 /* Statistics */ 232 struct xfrm_stats stats; 233 234 struct xfrm_lifetime_cur curlft; 235 struct hrtimer mtimer; 236 237 struct xfrm_state_offload xso; 238 239 /* used to fix curlft->add_time when changing date */ 240 long saved_tmo; 241 242 /* Last used time */ 243 time64_t lastused; 244 245 struct page_frag xfrag; 246 247 /* Reference to data common to all the instances of this 248 * transformer. */ 249 const struct xfrm_type *type; 250 struct xfrm_mode inner_mode; 251 struct xfrm_mode inner_mode_iaf; 252 struct xfrm_mode outer_mode; 253 254 const struct xfrm_type_offload *type_offload; 255 256 /* Security context */ 257 struct xfrm_sec_ctx *security; 258 259 /* Private data of this transformer, format is opaque, 260 * interpreted by xfrm_type methods. */ 261 void *data; 262 }; 263 264 static inline struct net *xs_net(struct xfrm_state *x) 265 { 266 return read_pnet(&x->xs_net); 267 } 268 269 /* xflags - make enum if more show up */ 270 #define XFRM_TIME_DEFER 1 271 #define XFRM_SOFT_EXPIRE 2 272 273 enum { 274 XFRM_STATE_VOID, 275 XFRM_STATE_ACQ, 276 XFRM_STATE_VALID, 277 XFRM_STATE_ERROR, 278 XFRM_STATE_EXPIRED, 279 XFRM_STATE_DEAD 280 }; 281 282 /* callback structure passed from either netlink or pfkey */ 283 struct km_event { 284 union { 285 u32 hard; 286 u32 proto; 287 u32 byid; 288 u32 aevent; 289 u32 type; 290 } data; 291 292 u32 seq; 293 u32 portid; 294 u32 event; 295 struct net *net; 296 }; 297 298 struct xfrm_replay { 299 void (*advance)(struct xfrm_state *x, __be32 net_seq); 300 int (*check)(struct xfrm_state *x, 301 struct sk_buff *skb, 302 __be32 net_seq); 303 int (*recheck)(struct xfrm_state *x, 304 struct sk_buff *skb, 305 __be32 net_seq); 306 void (*notify)(struct xfrm_state *x, int event); 307 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb); 308 }; 309 310 struct xfrm_if_cb { 311 struct xfrm_if *(*decode_session)(struct sk_buff *skb, 312 unsigned short family); 313 }; 314 315 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb); 316 void xfrm_if_unregister_cb(void); 317 318 struct net_device; 319 struct xfrm_type; 320 struct xfrm_dst; 321 struct xfrm_policy_afinfo { 322 struct dst_ops *dst_ops; 323 struct dst_entry *(*dst_lookup)(struct net *net, 324 int tos, int oif, 325 const xfrm_address_t *saddr, 326 const xfrm_address_t *daddr, 327 u32 mark); 328 int (*get_saddr)(struct net *net, int oif, 329 xfrm_address_t *saddr, 330 xfrm_address_t *daddr, 331 u32 mark); 332 int (*fill_dst)(struct xfrm_dst *xdst, 333 struct net_device *dev, 334 const struct flowi *fl); 335 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig); 336 }; 337 338 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family); 339 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo); 340 void km_policy_notify(struct xfrm_policy *xp, int dir, 341 const struct km_event *c); 342 void km_state_notify(struct xfrm_state *x, const struct km_event *c); 343 344 struct xfrm_tmpl; 345 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, 346 struct xfrm_policy *pol); 347 void km_state_expired(struct xfrm_state *x, int hard, u32 portid); 348 int __xfrm_state_delete(struct xfrm_state *x); 349 350 struct xfrm_state_afinfo { 351 u8 family; 352 u8 proto; 353 354 const struct xfrm_type_offload *type_offload_esp; 355 356 const struct xfrm_type *type_esp; 357 const struct xfrm_type *type_ipip; 358 const struct xfrm_type *type_ipip6; 359 const struct xfrm_type *type_comp; 360 const struct xfrm_type *type_ah; 361 const struct xfrm_type *type_routing; 362 const struct xfrm_type *type_dstopts; 363 364 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb); 365 int (*transport_finish)(struct sk_buff *skb, 366 int async); 367 void (*local_error)(struct sk_buff *skb, u32 mtu); 368 }; 369 370 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 371 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 372 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); 373 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family); 374 375 struct xfrm_input_afinfo { 376 unsigned int family; 377 int (*callback)(struct sk_buff *skb, u8 protocol, 378 int err); 379 }; 380 381 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo); 382 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo); 383 384 void xfrm_flush_gc(void); 385 void xfrm_state_delete_tunnel(struct xfrm_state *x); 386 387 struct xfrm_type { 388 char *description; 389 struct module *owner; 390 u8 proto; 391 u8 flags; 392 #define XFRM_TYPE_NON_FRAGMENT 1 393 #define XFRM_TYPE_REPLAY_PROT 2 394 #define XFRM_TYPE_LOCAL_COADDR 4 395 #define XFRM_TYPE_REMOTE_COADDR 8 396 397 int (*init_state)(struct xfrm_state *x); 398 void (*destructor)(struct xfrm_state *); 399 int (*input)(struct xfrm_state *, struct sk_buff *skb); 400 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 401 int (*reject)(struct xfrm_state *, struct sk_buff *, 402 const struct flowi *); 403 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **); 404 }; 405 406 int xfrm_register_type(const struct xfrm_type *type, unsigned short family); 407 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); 408 409 struct xfrm_type_offload { 410 char *description; 411 struct module *owner; 412 u8 proto; 413 void (*encap)(struct xfrm_state *, struct sk_buff *pskb); 414 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb); 415 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features); 416 }; 417 418 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family); 419 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family); 420 421 static inline int xfrm_af2proto(unsigned int family) 422 { 423 switch(family) { 424 case AF_INET: 425 return IPPROTO_IPIP; 426 case AF_INET6: 427 return IPPROTO_IPV6; 428 default: 429 return 0; 430 } 431 } 432 433 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto) 434 { 435 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) || 436 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6)) 437 return &x->inner_mode; 438 else 439 return &x->inner_mode_iaf; 440 } 441 442 struct xfrm_tmpl { 443 /* id in template is interpreted as: 444 * daddr - destination of tunnel, may be zero for transport mode. 445 * spi - zero to acquire spi. Not zero if spi is static, then 446 * daddr must be fixed too. 447 * proto - AH/ESP/IPCOMP 448 */ 449 struct xfrm_id id; 450 451 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 452 xfrm_address_t saddr; 453 454 unsigned short encap_family; 455 456 u32 reqid; 457 458 /* Mode: transport, tunnel etc. */ 459 u8 mode; 460 461 /* Sharing mode: unique, this session only, this user only etc. */ 462 u8 share; 463 464 /* May skip this transfomration if no SA is found */ 465 u8 optional; 466 467 /* Skip aalgos/ealgos/calgos checks. */ 468 u8 allalgs; 469 470 /* Bit mask of algos allowed for acquisition */ 471 u32 aalgos; 472 u32 ealgos; 473 u32 calgos; 474 }; 475 476 #define XFRM_MAX_DEPTH 6 477 #define XFRM_MAX_OFFLOAD_DEPTH 1 478 479 struct xfrm_policy_walk_entry { 480 struct list_head all; 481 u8 dead; 482 }; 483 484 struct xfrm_policy_walk { 485 struct xfrm_policy_walk_entry walk; 486 u8 type; 487 u32 seq; 488 }; 489 490 struct xfrm_policy_queue { 491 struct sk_buff_head hold_queue; 492 struct timer_list hold_timer; 493 unsigned long timeout; 494 }; 495 496 struct xfrm_policy { 497 possible_net_t xp_net; 498 struct hlist_node bydst; 499 struct hlist_node byidx; 500 501 /* This lock only affects elements except for entry. */ 502 rwlock_t lock; 503 refcount_t refcnt; 504 u32 pos; 505 struct timer_list timer; 506 507 atomic_t genid; 508 u32 priority; 509 u32 index; 510 u32 if_id; 511 struct xfrm_mark mark; 512 struct xfrm_selector selector; 513 struct xfrm_lifetime_cfg lft; 514 struct xfrm_lifetime_cur curlft; 515 struct xfrm_policy_walk_entry walk; 516 struct xfrm_policy_queue polq; 517 bool bydst_reinsert; 518 u8 type; 519 u8 action; 520 u8 flags; 521 u8 xfrm_nr; 522 u16 family; 523 struct xfrm_sec_ctx *security; 524 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 525 struct hlist_node bydst_inexact_list; 526 struct rcu_head rcu; 527 }; 528 529 static inline struct net *xp_net(const struct xfrm_policy *xp) 530 { 531 return read_pnet(&xp->xp_net); 532 } 533 534 struct xfrm_kmaddress { 535 xfrm_address_t local; 536 xfrm_address_t remote; 537 u32 reserved; 538 u16 family; 539 }; 540 541 struct xfrm_migrate { 542 xfrm_address_t old_daddr; 543 xfrm_address_t old_saddr; 544 xfrm_address_t new_daddr; 545 xfrm_address_t new_saddr; 546 u8 proto; 547 u8 mode; 548 u16 reserved; 549 u32 reqid; 550 u16 old_family; 551 u16 new_family; 552 }; 553 554 #define XFRM_KM_TIMEOUT 30 555 /* what happened */ 556 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 557 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 558 559 /* default aevent timeout in units of 100ms */ 560 #define XFRM_AE_ETIME 10 561 /* Async Event timer multiplier */ 562 #define XFRM_AE_ETH_M 10 563 /* default seq threshold size */ 564 #define XFRM_AE_SEQT_SIZE 2 565 566 struct xfrm_mgr { 567 struct list_head list; 568 int (*notify)(struct xfrm_state *x, const struct km_event *c); 569 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp); 570 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 571 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 572 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c); 573 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 574 int (*migrate)(const struct xfrm_selector *sel, 575 u8 dir, u8 type, 576 const struct xfrm_migrate *m, 577 int num_bundles, 578 const struct xfrm_kmaddress *k, 579 const struct xfrm_encap_tmpl *encap); 580 bool (*is_alive)(const struct km_event *c); 581 }; 582 583 int xfrm_register_km(struct xfrm_mgr *km); 584 int xfrm_unregister_km(struct xfrm_mgr *km); 585 586 struct xfrm_tunnel_skb_cb { 587 union { 588 struct inet_skb_parm h4; 589 struct inet6_skb_parm h6; 590 } header; 591 592 union { 593 struct ip_tunnel *ip4; 594 struct ip6_tnl *ip6; 595 } tunnel; 596 }; 597 598 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0])) 599 600 /* 601 * This structure is used for the duration where packets are being 602 * transformed by IPsec. As soon as the packet leaves IPsec the 603 * area beyond the generic IP part may be overwritten. 604 */ 605 struct xfrm_skb_cb { 606 struct xfrm_tunnel_skb_cb header; 607 608 /* Sequence number for replay protection. */ 609 union { 610 struct { 611 __u32 low; 612 __u32 hi; 613 } output; 614 struct { 615 __be32 low; 616 __be32 hi; 617 } input; 618 } seq; 619 }; 620 621 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) 622 623 /* 624 * This structure is used by the afinfo prepare_input/prepare_output functions 625 * to transmit header information to the mode input/output functions. 626 */ 627 struct xfrm_mode_skb_cb { 628 struct xfrm_tunnel_skb_cb header; 629 630 /* Copied from header for IPv4, always set to zero and DF for IPv6. */ 631 __be16 id; 632 __be16 frag_off; 633 634 /* IP header length (excluding options or extension headers). */ 635 u8 ihl; 636 637 /* TOS for IPv4, class for IPv6. */ 638 u8 tos; 639 640 /* TTL for IPv4, hop limitfor IPv6. */ 641 u8 ttl; 642 643 /* Protocol for IPv4, NH for IPv6. */ 644 u8 protocol; 645 646 /* Option length for IPv4, zero for IPv6. */ 647 u8 optlen; 648 649 /* Used by IPv6 only, zero for IPv4. */ 650 u8 flow_lbl[3]; 651 }; 652 653 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0])) 654 655 /* 656 * This structure is used by the input processing to locate the SPI and 657 * related information. 658 */ 659 struct xfrm_spi_skb_cb { 660 struct xfrm_tunnel_skb_cb header; 661 662 unsigned int daddroff; 663 unsigned int family; 664 __be32 seq; 665 }; 666 667 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0])) 668 669 #ifdef CONFIG_AUDITSYSCALL 670 static inline struct audit_buffer *xfrm_audit_start(const char *op) 671 { 672 struct audit_buffer *audit_buf = NULL; 673 674 if (audit_enabled == AUDIT_OFF) 675 return NULL; 676 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC, 677 AUDIT_MAC_IPSEC_EVENT); 678 if (audit_buf == NULL) 679 return NULL; 680 audit_log_format(audit_buf, "op=%s", op); 681 return audit_buf; 682 } 683 684 static inline void xfrm_audit_helper_usrinfo(bool task_valid, 685 struct audit_buffer *audit_buf) 686 { 687 const unsigned int auid = from_kuid(&init_user_ns, task_valid ? 688 audit_get_loginuid(current) : 689 INVALID_UID); 690 const unsigned int ses = task_valid ? audit_get_sessionid(current) : 691 AUDIT_SID_UNSET; 692 693 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses); 694 audit_log_task_context(audit_buf); 695 } 696 697 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid); 698 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 699 bool task_valid); 700 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid); 701 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid); 702 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 703 struct sk_buff *skb); 704 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb, 705 __be32 net_seq); 706 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family); 707 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi, 708 __be32 net_seq); 709 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb, 710 u8 proto); 711 #else 712 713 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 714 bool task_valid) 715 { 716 } 717 718 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 719 bool task_valid) 720 { 721 } 722 723 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result, 724 bool task_valid) 725 { 726 } 727 728 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result, 729 bool task_valid) 730 { 731 } 732 733 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 734 struct sk_buff *skb) 735 { 736 } 737 738 static inline void xfrm_audit_state_replay(struct xfrm_state *x, 739 struct sk_buff *skb, __be32 net_seq) 740 { 741 } 742 743 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb, 744 u16 family) 745 { 746 } 747 748 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 749 __be32 net_spi, __be32 net_seq) 750 { 751 } 752 753 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x, 754 struct sk_buff *skb, u8 proto) 755 { 756 } 757 #endif /* CONFIG_AUDITSYSCALL */ 758 759 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 760 { 761 if (likely(policy != NULL)) 762 refcount_inc(&policy->refcnt); 763 } 764 765 void xfrm_policy_destroy(struct xfrm_policy *policy); 766 767 static inline void xfrm_pol_put(struct xfrm_policy *policy) 768 { 769 if (refcount_dec_and_test(&policy->refcnt)) 770 xfrm_policy_destroy(policy); 771 } 772 773 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 774 { 775 int i; 776 for (i = npols - 1; i >= 0; --i) 777 xfrm_pol_put(pols[i]); 778 } 779 780 void __xfrm_state_destroy(struct xfrm_state *, bool); 781 782 static inline void __xfrm_state_put(struct xfrm_state *x) 783 { 784 refcount_dec(&x->refcnt); 785 } 786 787 static inline void xfrm_state_put(struct xfrm_state *x) 788 { 789 if (refcount_dec_and_test(&x->refcnt)) 790 __xfrm_state_destroy(x, false); 791 } 792 793 static inline void xfrm_state_put_sync(struct xfrm_state *x) 794 { 795 if (refcount_dec_and_test(&x->refcnt)) 796 __xfrm_state_destroy(x, true); 797 } 798 799 static inline void xfrm_state_hold(struct xfrm_state *x) 800 { 801 refcount_inc(&x->refcnt); 802 } 803 804 static inline bool addr_match(const void *token1, const void *token2, 805 unsigned int prefixlen) 806 { 807 const __be32 *a1 = token1; 808 const __be32 *a2 = token2; 809 unsigned int pdw; 810 unsigned int pbi; 811 812 pdw = prefixlen >> 5; /* num of whole u32 in prefix */ 813 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 814 815 if (pdw) 816 if (memcmp(a1, a2, pdw << 2)) 817 return false; 818 819 if (pbi) { 820 __be32 mask; 821 822 mask = htonl((0xffffffff) << (32 - pbi)); 823 824 if ((a1[pdw] ^ a2[pdw]) & mask) 825 return false; 826 } 827 828 return true; 829 } 830 831 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen) 832 { 833 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */ 834 if (sizeof(long) == 4 && prefixlen == 0) 835 return true; 836 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen))); 837 } 838 839 static __inline__ 840 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli) 841 { 842 __be16 port; 843 switch(fl->flowi_proto) { 844 case IPPROTO_TCP: 845 case IPPROTO_UDP: 846 case IPPROTO_UDPLITE: 847 case IPPROTO_SCTP: 848 port = uli->ports.sport; 849 break; 850 case IPPROTO_ICMP: 851 case IPPROTO_ICMPV6: 852 port = htons(uli->icmpt.type); 853 break; 854 case IPPROTO_MH: 855 port = htons(uli->mht.type); 856 break; 857 case IPPROTO_GRE: 858 port = htons(ntohl(uli->gre_key) >> 16); 859 break; 860 default: 861 port = 0; /*XXX*/ 862 } 863 return port; 864 } 865 866 static __inline__ 867 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli) 868 { 869 __be16 port; 870 switch(fl->flowi_proto) { 871 case IPPROTO_TCP: 872 case IPPROTO_UDP: 873 case IPPROTO_UDPLITE: 874 case IPPROTO_SCTP: 875 port = uli->ports.dport; 876 break; 877 case IPPROTO_ICMP: 878 case IPPROTO_ICMPV6: 879 port = htons(uli->icmpt.code); 880 break; 881 case IPPROTO_GRE: 882 port = htons(ntohl(uli->gre_key) & 0xffff); 883 break; 884 default: 885 port = 0; /*XXX*/ 886 } 887 return port; 888 } 889 890 bool xfrm_selector_match(const struct xfrm_selector *sel, 891 const struct flowi *fl, unsigned short family); 892 893 #ifdef CONFIG_SECURITY_NETWORK_XFRM 894 /* If neither has a context --> match 895 * Otherwise, both must have a context and the sids, doi, alg must match 896 */ 897 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 898 { 899 return ((!s1 && !s2) || 900 (s1 && s2 && 901 (s1->ctx_sid == s2->ctx_sid) && 902 (s1->ctx_doi == s2->ctx_doi) && 903 (s1->ctx_alg == s2->ctx_alg))); 904 } 905 #else 906 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 907 { 908 return true; 909 } 910 #endif 911 912 /* A struct encoding bundle of transformations to apply to some set of flow. 913 * 914 * xdst->child points to the next element of bundle. 915 * dst->xfrm points to an instanse of transformer. 916 * 917 * Due to unfortunate limitations of current routing cache, which we 918 * have no time to fix, it mirrors struct rtable and bound to the same 919 * routing key, including saddr,daddr. However, we can have many of 920 * bundles differing by session id. All the bundles grow from a parent 921 * policy rule. 922 */ 923 struct xfrm_dst { 924 union { 925 struct dst_entry dst; 926 struct rtable rt; 927 struct rt6_info rt6; 928 } u; 929 struct dst_entry *route; 930 struct dst_entry *child; 931 struct dst_entry *path; 932 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; 933 int num_pols, num_xfrms; 934 u32 xfrm_genid; 935 u32 policy_genid; 936 u32 route_mtu_cached; 937 u32 child_mtu_cached; 938 u32 route_cookie; 939 u32 path_cookie; 940 }; 941 942 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst) 943 { 944 #ifdef CONFIG_XFRM 945 if (dst->xfrm) { 946 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst; 947 948 return xdst->path; 949 } 950 #endif 951 return (struct dst_entry *) dst; 952 } 953 954 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst) 955 { 956 #ifdef CONFIG_XFRM 957 if (dst->xfrm) { 958 struct xfrm_dst *xdst = (struct xfrm_dst *) dst; 959 return xdst->child; 960 } 961 #endif 962 return NULL; 963 } 964 965 #ifdef CONFIG_XFRM 966 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child) 967 { 968 xdst->child = child; 969 } 970 971 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 972 { 973 xfrm_pols_put(xdst->pols, xdst->num_pols); 974 dst_release(xdst->route); 975 if (likely(xdst->u.dst.xfrm)) 976 xfrm_state_put(xdst->u.dst.xfrm); 977 } 978 #endif 979 980 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 981 982 struct xfrm_if_parms { 983 int link; /* ifindex of underlying L2 interface */ 984 u32 if_id; /* interface identifyer */ 985 }; 986 987 struct xfrm_if { 988 struct xfrm_if __rcu *next; /* next interface in list */ 989 struct net_device *dev; /* virtual device associated with interface */ 990 struct net *net; /* netns for packet i/o */ 991 struct xfrm_if_parms p; /* interface parms */ 992 993 struct gro_cells gro_cells; 994 }; 995 996 struct xfrm_offload { 997 /* Output sequence number for replay protection on offloading. */ 998 struct { 999 __u32 low; 1000 __u32 hi; 1001 } seq; 1002 1003 __u32 flags; 1004 #define SA_DELETE_REQ 1 1005 #define CRYPTO_DONE 2 1006 #define CRYPTO_NEXT_DONE 4 1007 #define CRYPTO_FALLBACK 8 1008 #define XFRM_GSO_SEGMENT 16 1009 #define XFRM_GRO 32 1010 #define XFRM_ESP_NO_TRAILER 64 1011 #define XFRM_DEV_RESUME 128 1012 #define XFRM_XMIT 256 1013 1014 __u32 status; 1015 #define CRYPTO_SUCCESS 1 1016 #define CRYPTO_GENERIC_ERROR 2 1017 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4 1018 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8 1019 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16 1020 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32 1021 #define CRYPTO_INVALID_PACKET_SYNTAX 64 1022 #define CRYPTO_INVALID_PROTOCOL 128 1023 1024 __u8 proto; 1025 }; 1026 1027 struct sec_path { 1028 int len; 1029 int olen; 1030 1031 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 1032 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH]; 1033 }; 1034 1035 struct sec_path *secpath_set(struct sk_buff *skb); 1036 1037 static inline void 1038 secpath_reset(struct sk_buff *skb) 1039 { 1040 #ifdef CONFIG_XFRM 1041 skb_ext_del(skb, SKB_EXT_SEC_PATH); 1042 #endif 1043 } 1044 1045 static inline int 1046 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family) 1047 { 1048 switch (family) { 1049 case AF_INET: 1050 return addr->a4 == 0; 1051 case AF_INET6: 1052 return ipv6_addr_any(&addr->in6); 1053 } 1054 return 0; 1055 } 1056 1057 static inline int 1058 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1059 { 1060 return (tmpl->saddr.a4 && 1061 tmpl->saddr.a4 != x->props.saddr.a4); 1062 } 1063 1064 static inline int 1065 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1066 { 1067 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 1068 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 1069 } 1070 1071 static inline int 1072 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family) 1073 { 1074 switch (family) { 1075 case AF_INET: 1076 return __xfrm4_state_addr_cmp(tmpl, x); 1077 case AF_INET6: 1078 return __xfrm6_state_addr_cmp(tmpl, x); 1079 } 1080 return !0; 1081 } 1082 1083 #ifdef CONFIG_XFRM 1084 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, 1085 unsigned short family); 1086 1087 static inline int __xfrm_policy_check2(struct sock *sk, int dir, 1088 struct sk_buff *skb, 1089 unsigned int family, int reverse) 1090 { 1091 struct net *net = dev_net(skb->dev); 1092 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); 1093 1094 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 1095 return __xfrm_policy_check(sk, ndir, skb, family); 1096 1097 return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) || 1098 (skb_dst(skb)->flags & DST_NOPOLICY) || 1099 __xfrm_policy_check(sk, ndir, skb, family); 1100 } 1101 1102 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1103 { 1104 return __xfrm_policy_check2(sk, dir, skb, family, 0); 1105 } 1106 1107 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1108 { 1109 return xfrm_policy_check(sk, dir, skb, AF_INET); 1110 } 1111 1112 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1113 { 1114 return xfrm_policy_check(sk, dir, skb, AF_INET6); 1115 } 1116 1117 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1118 struct sk_buff *skb) 1119 { 1120 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); 1121 } 1122 1123 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1124 struct sk_buff *skb) 1125 { 1126 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); 1127 } 1128 1129 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1130 unsigned int family, int reverse); 1131 1132 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1133 unsigned int family) 1134 { 1135 return __xfrm_decode_session(skb, fl, family, 0); 1136 } 1137 1138 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1139 struct flowi *fl, 1140 unsigned int family) 1141 { 1142 return __xfrm_decode_session(skb, fl, family, 1); 1143 } 1144 1145 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 1146 1147 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 1148 { 1149 struct net *net = dev_net(skb->dev); 1150 1151 return !net->xfrm.policy_count[XFRM_POLICY_OUT] || 1152 (skb_dst(skb)->flags & DST_NOXFRM) || 1153 __xfrm_route_forward(skb, family); 1154 } 1155 1156 static inline int xfrm4_route_forward(struct sk_buff *skb) 1157 { 1158 return xfrm_route_forward(skb, AF_INET); 1159 } 1160 1161 static inline int xfrm6_route_forward(struct sk_buff *skb) 1162 { 1163 return xfrm_route_forward(skb, AF_INET6); 1164 } 1165 1166 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk); 1167 1168 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) 1169 { 1170 sk->sk_policy[0] = NULL; 1171 sk->sk_policy[1] = NULL; 1172 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1])) 1173 return __xfrm_sk_clone_policy(sk, osk); 1174 return 0; 1175 } 1176 1177 int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 1178 1179 static inline void xfrm_sk_free_policy(struct sock *sk) 1180 { 1181 struct xfrm_policy *pol; 1182 1183 pol = rcu_dereference_protected(sk->sk_policy[0], 1); 1184 if (unlikely(pol != NULL)) { 1185 xfrm_policy_delete(pol, XFRM_POLICY_MAX); 1186 sk->sk_policy[0] = NULL; 1187 } 1188 pol = rcu_dereference_protected(sk->sk_policy[1], 1); 1189 if (unlikely(pol != NULL)) { 1190 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1); 1191 sk->sk_policy[1] = NULL; 1192 } 1193 } 1194 1195 #else 1196 1197 static inline void xfrm_sk_free_policy(struct sock *sk) {} 1198 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; } 1199 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 1200 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 1201 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1202 { 1203 return 1; 1204 } 1205 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1206 { 1207 return 1; 1208 } 1209 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1210 { 1211 return 1; 1212 } 1213 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1214 struct flowi *fl, 1215 unsigned int family) 1216 { 1217 return -ENOSYS; 1218 } 1219 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1220 struct sk_buff *skb) 1221 { 1222 return 1; 1223 } 1224 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1225 struct sk_buff *skb) 1226 { 1227 return 1; 1228 } 1229 #endif 1230 1231 static __inline__ 1232 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family) 1233 { 1234 switch (family){ 1235 case AF_INET: 1236 return (xfrm_address_t *)&fl->u.ip4.daddr; 1237 case AF_INET6: 1238 return (xfrm_address_t *)&fl->u.ip6.daddr; 1239 } 1240 return NULL; 1241 } 1242 1243 static __inline__ 1244 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family) 1245 { 1246 switch (family){ 1247 case AF_INET: 1248 return (xfrm_address_t *)&fl->u.ip4.saddr; 1249 case AF_INET6: 1250 return (xfrm_address_t *)&fl->u.ip6.saddr; 1251 } 1252 return NULL; 1253 } 1254 1255 static __inline__ 1256 void xfrm_flowi_addr_get(const struct flowi *fl, 1257 xfrm_address_t *saddr, xfrm_address_t *daddr, 1258 unsigned short family) 1259 { 1260 switch(family) { 1261 case AF_INET: 1262 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4)); 1263 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4)); 1264 break; 1265 case AF_INET6: 1266 saddr->in6 = fl->u.ip6.saddr; 1267 daddr->in6 = fl->u.ip6.daddr; 1268 break; 1269 } 1270 } 1271 1272 static __inline__ int 1273 __xfrm4_state_addr_check(const struct xfrm_state *x, 1274 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1275 { 1276 if (daddr->a4 == x->id.daddr.a4 && 1277 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 1278 return 1; 1279 return 0; 1280 } 1281 1282 static __inline__ int 1283 __xfrm6_state_addr_check(const struct xfrm_state *x, 1284 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1285 { 1286 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 1287 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) || 1288 ipv6_addr_any((struct in6_addr *)saddr) || 1289 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 1290 return 1; 1291 return 0; 1292 } 1293 1294 static __inline__ int 1295 xfrm_state_addr_check(const struct xfrm_state *x, 1296 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1297 unsigned short family) 1298 { 1299 switch (family) { 1300 case AF_INET: 1301 return __xfrm4_state_addr_check(x, daddr, saddr); 1302 case AF_INET6: 1303 return __xfrm6_state_addr_check(x, daddr, saddr); 1304 } 1305 return 0; 1306 } 1307 1308 static __inline__ int 1309 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl, 1310 unsigned short family) 1311 { 1312 switch (family) { 1313 case AF_INET: 1314 return __xfrm4_state_addr_check(x, 1315 (const xfrm_address_t *)&fl->u.ip4.daddr, 1316 (const xfrm_address_t *)&fl->u.ip4.saddr); 1317 case AF_INET6: 1318 return __xfrm6_state_addr_check(x, 1319 (const xfrm_address_t *)&fl->u.ip6.daddr, 1320 (const xfrm_address_t *)&fl->u.ip6.saddr); 1321 } 1322 return 0; 1323 } 1324 1325 static inline int xfrm_state_kern(const struct xfrm_state *x) 1326 { 1327 return atomic_read(&x->tunnel_users); 1328 } 1329 1330 static inline bool xfrm_id_proto_valid(u8 proto) 1331 { 1332 switch (proto) { 1333 case IPPROTO_AH: 1334 case IPPROTO_ESP: 1335 case IPPROTO_COMP: 1336 #if IS_ENABLED(CONFIG_IPV6) 1337 case IPPROTO_ROUTING: 1338 case IPPROTO_DSTOPTS: 1339 #endif 1340 return true; 1341 default: 1342 return false; 1343 } 1344 } 1345 1346 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */ 1347 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 1348 { 1349 return (!userproto || proto == userproto || 1350 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 1351 proto == IPPROTO_ESP || 1352 proto == IPPROTO_COMP))); 1353 } 1354 1355 /* 1356 * xfrm algorithm information 1357 */ 1358 struct xfrm_algo_aead_info { 1359 char *geniv; 1360 u16 icv_truncbits; 1361 }; 1362 1363 struct xfrm_algo_auth_info { 1364 u16 icv_truncbits; 1365 u16 icv_fullbits; 1366 }; 1367 1368 struct xfrm_algo_encr_info { 1369 char *geniv; 1370 u16 blockbits; 1371 u16 defkeybits; 1372 }; 1373 1374 struct xfrm_algo_comp_info { 1375 u16 threshold; 1376 }; 1377 1378 struct xfrm_algo_desc { 1379 char *name; 1380 char *compat; 1381 u8 available:1; 1382 u8 pfkey_supported:1; 1383 union { 1384 struct xfrm_algo_aead_info aead; 1385 struct xfrm_algo_auth_info auth; 1386 struct xfrm_algo_encr_info encr; 1387 struct xfrm_algo_comp_info comp; 1388 } uinfo; 1389 struct sadb_alg desc; 1390 }; 1391 1392 /* XFRM protocol handlers. */ 1393 struct xfrm4_protocol { 1394 int (*handler)(struct sk_buff *skb); 1395 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1396 int encap_type); 1397 int (*cb_handler)(struct sk_buff *skb, int err); 1398 int (*err_handler)(struct sk_buff *skb, u32 info); 1399 1400 struct xfrm4_protocol __rcu *next; 1401 int priority; 1402 }; 1403 1404 struct xfrm6_protocol { 1405 int (*handler)(struct sk_buff *skb); 1406 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1407 int encap_type); 1408 int (*cb_handler)(struct sk_buff *skb, int err); 1409 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1410 u8 type, u8 code, int offset, __be32 info); 1411 1412 struct xfrm6_protocol __rcu *next; 1413 int priority; 1414 }; 1415 1416 /* XFRM tunnel handlers. */ 1417 struct xfrm_tunnel { 1418 int (*handler)(struct sk_buff *skb); 1419 int (*err_handler)(struct sk_buff *skb, u32 info); 1420 1421 struct xfrm_tunnel __rcu *next; 1422 int priority; 1423 }; 1424 1425 struct xfrm6_tunnel { 1426 int (*handler)(struct sk_buff *skb); 1427 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1428 u8 type, u8 code, int offset, __be32 info); 1429 struct xfrm6_tunnel __rcu *next; 1430 int priority; 1431 }; 1432 1433 void xfrm_init(void); 1434 void xfrm4_init(void); 1435 int xfrm_state_init(struct net *net); 1436 void xfrm_state_fini(struct net *net); 1437 void xfrm4_state_init(void); 1438 void xfrm4_protocol_init(void); 1439 #ifdef CONFIG_XFRM 1440 int xfrm6_init(void); 1441 void xfrm6_fini(void); 1442 int xfrm6_state_init(void); 1443 void xfrm6_state_fini(void); 1444 int xfrm6_protocol_init(void); 1445 void xfrm6_protocol_fini(void); 1446 #else 1447 static inline int xfrm6_init(void) 1448 { 1449 return 0; 1450 } 1451 static inline void xfrm6_fini(void) 1452 { 1453 ; 1454 } 1455 #endif 1456 1457 #ifdef CONFIG_XFRM_STATISTICS 1458 int xfrm_proc_init(struct net *net); 1459 void xfrm_proc_fini(struct net *net); 1460 #endif 1461 1462 int xfrm_sysctl_init(struct net *net); 1463 #ifdef CONFIG_SYSCTL 1464 void xfrm_sysctl_fini(struct net *net); 1465 #else 1466 static inline void xfrm_sysctl_fini(struct net *net) 1467 { 1468 } 1469 #endif 1470 1471 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 1472 struct xfrm_address_filter *filter); 1473 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1474 int (*func)(struct xfrm_state *, int, void*), void *); 1475 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net); 1476 struct xfrm_state *xfrm_state_alloc(struct net *net); 1477 void xfrm_state_free(struct xfrm_state *x); 1478 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr, 1479 const xfrm_address_t *saddr, 1480 const struct flowi *fl, 1481 struct xfrm_tmpl *tmpl, 1482 struct xfrm_policy *pol, int *err, 1483 unsigned short family, u32 if_id); 1484 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id, 1485 xfrm_address_t *daddr, 1486 xfrm_address_t *saddr, 1487 unsigned short family, 1488 u8 mode, u8 proto, u32 reqid); 1489 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1490 unsigned short family); 1491 int xfrm_state_check_expire(struct xfrm_state *x); 1492 void xfrm_state_insert(struct xfrm_state *x); 1493 int xfrm_state_add(struct xfrm_state *x); 1494 int xfrm_state_update(struct xfrm_state *x); 1495 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark, 1496 const xfrm_address_t *daddr, __be32 spi, 1497 u8 proto, unsigned short family); 1498 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1499 const xfrm_address_t *daddr, 1500 const xfrm_address_t *saddr, 1501 u8 proto, 1502 unsigned short family); 1503 #ifdef CONFIG_XFRM_SUB_POLICY 1504 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1505 unsigned short family); 1506 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1507 unsigned short family); 1508 #else 1509 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s, 1510 int n, unsigned short family) 1511 { 1512 } 1513 1514 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s, 1515 int n, unsigned short family) 1516 { 1517 } 1518 #endif 1519 1520 struct xfrmk_sadinfo { 1521 u32 sadhcnt; /* current hash bkts */ 1522 u32 sadhmcnt; /* max allowed hash bkts */ 1523 u32 sadcnt; /* current running count */ 1524 }; 1525 1526 struct xfrmk_spdinfo { 1527 u32 incnt; 1528 u32 outcnt; 1529 u32 fwdcnt; 1530 u32 inscnt; 1531 u32 outscnt; 1532 u32 fwdscnt; 1533 u32 spdhcnt; 1534 u32 spdhmcnt; 1535 }; 1536 1537 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1538 int xfrm_state_delete(struct xfrm_state *x); 1539 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync); 1540 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid); 1541 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); 1542 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); 1543 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq); 1544 int xfrm_init_replay(struct xfrm_state *x); 1545 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu); 1546 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload); 1547 int xfrm_init_state(struct xfrm_state *x); 1548 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type); 1549 int xfrm_input_resume(struct sk_buff *skb, int nexthdr); 1550 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb, 1551 int (*finish)(struct net *, struct sock *, 1552 struct sk_buff *)); 1553 int xfrm_trans_queue(struct sk_buff *skb, 1554 int (*finish)(struct net *, struct sock *, 1555 struct sk_buff *)); 1556 int xfrm_output_resume(struct sk_buff *skb, int err); 1557 int xfrm_output(struct sock *sk, struct sk_buff *skb); 1558 1559 #if IS_ENABLED(CONFIG_NET_PKTGEN) 1560 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb); 1561 #endif 1562 1563 void xfrm_local_error(struct sk_buff *skb, int mtu); 1564 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1565 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1566 int encap_type); 1567 int xfrm4_transport_finish(struct sk_buff *skb, int async); 1568 int xfrm4_rcv(struct sk_buff *skb); 1569 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1570 1571 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1572 { 1573 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL; 1574 XFRM_SPI_SKB_CB(skb)->family = AF_INET; 1575 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); 1576 return xfrm_input(skb, nexthdr, spi, 0); 1577 } 1578 1579 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1580 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb); 1581 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol); 1582 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol); 1583 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1584 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1585 void xfrm4_local_error(struct sk_buff *skb, u32 mtu); 1586 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1587 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi, 1588 struct ip6_tnl *t); 1589 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1590 int encap_type); 1591 int xfrm6_transport_finish(struct sk_buff *skb, int async); 1592 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t); 1593 int xfrm6_rcv(struct sk_buff *skb); 1594 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1595 xfrm_address_t *saddr, u8 proto); 1596 void xfrm6_local_error(struct sk_buff *skb, u32 mtu); 1597 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol); 1598 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol); 1599 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1600 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1601 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr); 1602 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr); 1603 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1604 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb); 1605 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, 1606 u8 **prevhdr); 1607 1608 #ifdef CONFIG_XFRM 1609 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu); 1610 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1611 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1612 int xfrm_user_policy(struct sock *sk, int optname, 1613 u8 __user *optval, int optlen); 1614 #else 1615 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 1616 { 1617 return -ENOPROTOOPT; 1618 } 1619 #endif 1620 1621 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif, 1622 const xfrm_address_t *saddr, 1623 const xfrm_address_t *daddr, 1624 int family, u32 mark); 1625 1626 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); 1627 1628 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); 1629 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, 1630 int (*func)(struct xfrm_policy *, int, int, void*), 1631 void *); 1632 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net); 1633 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1634 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u32 if_id, 1635 u8 type, int dir, 1636 struct xfrm_selector *sel, 1637 struct xfrm_sec_ctx *ctx, int delete, 1638 int *err); 1639 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u32 if_id, u8, 1640 int dir, u32 id, int delete, int *err); 1641 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid); 1642 void xfrm_policy_hash_rebuild(struct net *net); 1643 u32 xfrm_get_acqseq(void); 1644 int verify_spi_info(u8 proto, u32 min, u32 max); 1645 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 1646 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, 1647 u8 mode, u32 reqid, u32 if_id, u8 proto, 1648 const xfrm_address_t *daddr, 1649 const xfrm_address_t *saddr, int create, 1650 unsigned short family); 1651 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1652 1653 #ifdef CONFIG_XFRM_MIGRATE 1654 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1655 const struct xfrm_migrate *m, int num_bundles, 1656 const struct xfrm_kmaddress *k, 1657 const struct xfrm_encap_tmpl *encap); 1658 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net); 1659 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 1660 struct xfrm_migrate *m, 1661 struct xfrm_encap_tmpl *encap); 1662 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1663 struct xfrm_migrate *m, int num_bundles, 1664 struct xfrm_kmaddress *k, struct net *net, 1665 struct xfrm_encap_tmpl *encap); 1666 #endif 1667 1668 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1669 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid); 1670 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, 1671 xfrm_address_t *addr); 1672 1673 void xfrm_input_init(void); 1674 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1675 1676 void xfrm_probe_algs(void); 1677 int xfrm_count_pfkey_auth_supported(void); 1678 int xfrm_count_pfkey_enc_supported(void); 1679 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1680 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1681 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1682 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1683 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1684 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe); 1685 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe); 1686 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe); 1687 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, 1688 int probe); 1689 1690 static inline bool xfrm6_addr_equal(const xfrm_address_t *a, 1691 const xfrm_address_t *b) 1692 { 1693 return ipv6_addr_equal((const struct in6_addr *)a, 1694 (const struct in6_addr *)b); 1695 } 1696 1697 static inline bool xfrm_addr_equal(const xfrm_address_t *a, 1698 const xfrm_address_t *b, 1699 sa_family_t family) 1700 { 1701 switch (family) { 1702 default: 1703 case AF_INET: 1704 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0; 1705 case AF_INET6: 1706 return xfrm6_addr_equal(a, b); 1707 } 1708 } 1709 1710 static inline int xfrm_policy_id2dir(u32 index) 1711 { 1712 return index & 7; 1713 } 1714 1715 #ifdef CONFIG_XFRM 1716 static inline int xfrm_aevent_is_on(struct net *net) 1717 { 1718 struct sock *nlsk; 1719 int ret = 0; 1720 1721 rcu_read_lock(); 1722 nlsk = rcu_dereference(net->xfrm.nlsk); 1723 if (nlsk) 1724 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1725 rcu_read_unlock(); 1726 return ret; 1727 } 1728 1729 static inline int xfrm_acquire_is_on(struct net *net) 1730 { 1731 struct sock *nlsk; 1732 int ret = 0; 1733 1734 rcu_read_lock(); 1735 nlsk = rcu_dereference(net->xfrm.nlsk); 1736 if (nlsk) 1737 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE); 1738 rcu_read_unlock(); 1739 1740 return ret; 1741 } 1742 #endif 1743 1744 static inline unsigned int aead_len(struct xfrm_algo_aead *alg) 1745 { 1746 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1747 } 1748 1749 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg) 1750 { 1751 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1752 } 1753 1754 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg) 1755 { 1756 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1757 } 1758 1759 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn) 1760 { 1761 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32); 1762 } 1763 1764 #ifdef CONFIG_XFRM_MIGRATE 1765 static inline int xfrm_replay_clone(struct xfrm_state *x, 1766 struct xfrm_state *orig) 1767 { 1768 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn), 1769 GFP_KERNEL); 1770 if (!x->replay_esn) 1771 return -ENOMEM; 1772 1773 x->replay_esn->bmp_len = orig->replay_esn->bmp_len; 1774 x->replay_esn->replay_window = orig->replay_esn->replay_window; 1775 1776 x->preplay_esn = kmemdup(x->replay_esn, 1777 xfrm_replay_state_esn_len(x->replay_esn), 1778 GFP_KERNEL); 1779 if (!x->preplay_esn) { 1780 kfree(x->replay_esn); 1781 return -ENOMEM; 1782 } 1783 1784 return 0; 1785 } 1786 1787 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig) 1788 { 1789 return kmemdup(orig, aead_len(orig), GFP_KERNEL); 1790 } 1791 1792 1793 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1794 { 1795 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); 1796 } 1797 1798 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig) 1799 { 1800 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL); 1801 } 1802 1803 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1804 { 1805 int i; 1806 for (i = 0; i < n; i++) 1807 xfrm_state_put(*(states + i)); 1808 } 1809 1810 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1811 { 1812 int i; 1813 for (i = 0; i < n; i++) 1814 xfrm_state_delete(*(states + i)); 1815 } 1816 #endif 1817 1818 #ifdef CONFIG_XFRM 1819 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) 1820 { 1821 struct sec_path *sp = skb_sec_path(skb); 1822 1823 return sp->xvec[sp->len - 1]; 1824 } 1825 #endif 1826 1827 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb) 1828 { 1829 #ifdef CONFIG_XFRM 1830 struct sec_path *sp = skb_sec_path(skb); 1831 1832 if (!sp || !sp->olen || sp->len != sp->olen) 1833 return NULL; 1834 1835 return &sp->ovec[sp->olen - 1]; 1836 #else 1837 return NULL; 1838 #endif 1839 } 1840 1841 void __init xfrm_dev_init(void); 1842 1843 #ifdef CONFIG_XFRM_OFFLOAD 1844 void xfrm_dev_resume(struct sk_buff *skb); 1845 void xfrm_dev_backlog(struct softnet_data *sd); 1846 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again); 1847 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, 1848 struct xfrm_user_offload *xuo); 1849 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x); 1850 1851 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 1852 { 1853 struct xfrm_state_offload *xso = &x->xso; 1854 1855 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn) 1856 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x); 1857 } 1858 1859 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 1860 { 1861 struct xfrm_state *x = dst->xfrm; 1862 struct xfrm_dst *xdst; 1863 1864 if (!x || !x->type_offload) 1865 return false; 1866 1867 xdst = (struct xfrm_dst *) dst; 1868 if (!x->xso.offload_handle && !xdst->child->xfrm) 1869 return true; 1870 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) && 1871 !xdst->child->xfrm) 1872 return true; 1873 1874 return false; 1875 } 1876 1877 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 1878 { 1879 struct xfrm_state_offload *xso = &x->xso; 1880 1881 if (xso->dev) 1882 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x); 1883 } 1884 1885 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1886 { 1887 struct xfrm_state_offload *xso = &x->xso; 1888 struct net_device *dev = xso->dev; 1889 1890 if (dev && dev->xfrmdev_ops) { 1891 if (dev->xfrmdev_ops->xdo_dev_state_free) 1892 dev->xfrmdev_ops->xdo_dev_state_free(x); 1893 xso->dev = NULL; 1894 dev_put(dev); 1895 } 1896 } 1897 #else 1898 static inline void xfrm_dev_resume(struct sk_buff *skb) 1899 { 1900 } 1901 1902 static inline void xfrm_dev_backlog(struct softnet_data *sd) 1903 { 1904 } 1905 1906 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again) 1907 { 1908 return skb; 1909 } 1910 1911 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo) 1912 { 1913 return 0; 1914 } 1915 1916 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 1917 { 1918 } 1919 1920 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1921 { 1922 } 1923 1924 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) 1925 { 1926 return false; 1927 } 1928 1929 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 1930 { 1931 } 1932 1933 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 1934 { 1935 return false; 1936 } 1937 #endif 1938 1939 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) 1940 { 1941 if (attrs[XFRMA_MARK]) 1942 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark)); 1943 else 1944 m->v = m->m = 0; 1945 1946 return m->v & m->m; 1947 } 1948 1949 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m) 1950 { 1951 int ret = 0; 1952 1953 if (m->m | m->v) 1954 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); 1955 return ret; 1956 } 1957 1958 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x) 1959 { 1960 struct xfrm_mark *m = &x->props.smark; 1961 1962 return (m->v & m->m) | (mark & ~m->m); 1963 } 1964 1965 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id) 1966 { 1967 int ret = 0; 1968 1969 if (if_id) 1970 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id); 1971 return ret; 1972 } 1973 1974 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x, 1975 unsigned int family) 1976 { 1977 bool tunnel = false; 1978 1979 switch(family) { 1980 case AF_INET: 1981 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) 1982 tunnel = true; 1983 break; 1984 case AF_INET6: 1985 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) 1986 tunnel = true; 1987 break; 1988 } 1989 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL)) 1990 return -EINVAL; 1991 1992 return 0; 1993 } 1994 1995 #if IS_ENABLED(CONFIG_IPV6) 1996 static inline bool xfrm6_local_dontfrag(const struct sock *sk) 1997 { 1998 int proto; 1999 2000 if (!sk || sk->sk_family != AF_INET6) 2001 return false; 2002 2003 proto = sk->sk_protocol; 2004 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW) 2005 return inet6_sk(sk)->dontfrag; 2006 2007 return false; 2008 } 2009 #endif 2010 #endif /* _NET_XFRM_H */ 2011