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