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 #define XFRM_XMIT 256 1012 1013 __u32 status; 1014 #define CRYPTO_SUCCESS 1 1015 #define CRYPTO_GENERIC_ERROR 2 1016 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4 1017 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8 1018 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16 1019 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32 1020 #define CRYPTO_INVALID_PACKET_SYNTAX 64 1021 #define CRYPTO_INVALID_PROTOCOL 128 1022 1023 __u8 proto; 1024 }; 1025 1026 struct sec_path { 1027 int len; 1028 int olen; 1029 1030 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 1031 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH]; 1032 }; 1033 1034 struct sec_path *secpath_set(struct sk_buff *skb); 1035 1036 static inline void 1037 secpath_reset(struct sk_buff *skb) 1038 { 1039 #ifdef CONFIG_XFRM 1040 skb_ext_del(skb, SKB_EXT_SEC_PATH); 1041 #endif 1042 } 1043 1044 static inline int 1045 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family) 1046 { 1047 switch (family) { 1048 case AF_INET: 1049 return addr->a4 == 0; 1050 case AF_INET6: 1051 return ipv6_addr_any(&addr->in6); 1052 } 1053 return 0; 1054 } 1055 1056 static inline int 1057 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1058 { 1059 return (tmpl->saddr.a4 && 1060 tmpl->saddr.a4 != x->props.saddr.a4); 1061 } 1062 1063 static inline int 1064 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1065 { 1066 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 1067 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 1068 } 1069 1070 static inline int 1071 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family) 1072 { 1073 switch (family) { 1074 case AF_INET: 1075 return __xfrm4_state_addr_cmp(tmpl, x); 1076 case AF_INET6: 1077 return __xfrm6_state_addr_cmp(tmpl, x); 1078 } 1079 return !0; 1080 } 1081 1082 #ifdef CONFIG_XFRM 1083 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, 1084 unsigned short family); 1085 1086 static inline int __xfrm_policy_check2(struct sock *sk, int dir, 1087 struct sk_buff *skb, 1088 unsigned int family, int reverse) 1089 { 1090 struct net *net = dev_net(skb->dev); 1091 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); 1092 1093 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 1094 return __xfrm_policy_check(sk, ndir, skb, family); 1095 1096 return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) || 1097 (skb_dst(skb)->flags & DST_NOPOLICY) || 1098 __xfrm_policy_check(sk, ndir, skb, family); 1099 } 1100 1101 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1102 { 1103 return __xfrm_policy_check2(sk, dir, skb, family, 0); 1104 } 1105 1106 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1107 { 1108 return xfrm_policy_check(sk, dir, skb, AF_INET); 1109 } 1110 1111 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1112 { 1113 return xfrm_policy_check(sk, dir, skb, AF_INET6); 1114 } 1115 1116 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1117 struct sk_buff *skb) 1118 { 1119 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); 1120 } 1121 1122 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1123 struct sk_buff *skb) 1124 { 1125 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); 1126 } 1127 1128 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1129 unsigned int family, int reverse); 1130 1131 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1132 unsigned int family) 1133 { 1134 return __xfrm_decode_session(skb, fl, family, 0); 1135 } 1136 1137 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1138 struct flowi *fl, 1139 unsigned int family) 1140 { 1141 return __xfrm_decode_session(skb, fl, family, 1); 1142 } 1143 1144 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 1145 1146 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 1147 { 1148 struct net *net = dev_net(skb->dev); 1149 1150 return !net->xfrm.policy_count[XFRM_POLICY_OUT] || 1151 (skb_dst(skb)->flags & DST_NOXFRM) || 1152 __xfrm_route_forward(skb, family); 1153 } 1154 1155 static inline int xfrm4_route_forward(struct sk_buff *skb) 1156 { 1157 return xfrm_route_forward(skb, AF_INET); 1158 } 1159 1160 static inline int xfrm6_route_forward(struct sk_buff *skb) 1161 { 1162 return xfrm_route_forward(skb, AF_INET6); 1163 } 1164 1165 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk); 1166 1167 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) 1168 { 1169 sk->sk_policy[0] = NULL; 1170 sk->sk_policy[1] = NULL; 1171 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1])) 1172 return __xfrm_sk_clone_policy(sk, osk); 1173 return 0; 1174 } 1175 1176 int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 1177 1178 static inline void xfrm_sk_free_policy(struct sock *sk) 1179 { 1180 struct xfrm_policy *pol; 1181 1182 pol = rcu_dereference_protected(sk->sk_policy[0], 1); 1183 if (unlikely(pol != NULL)) { 1184 xfrm_policy_delete(pol, XFRM_POLICY_MAX); 1185 sk->sk_policy[0] = NULL; 1186 } 1187 pol = rcu_dereference_protected(sk->sk_policy[1], 1); 1188 if (unlikely(pol != NULL)) { 1189 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1); 1190 sk->sk_policy[1] = NULL; 1191 } 1192 } 1193 1194 #else 1195 1196 static inline void xfrm_sk_free_policy(struct sock *sk) {} 1197 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; } 1198 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 1199 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 1200 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1201 { 1202 return 1; 1203 } 1204 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1205 { 1206 return 1; 1207 } 1208 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1209 { 1210 return 1; 1211 } 1212 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1213 struct flowi *fl, 1214 unsigned int family) 1215 { 1216 return -ENOSYS; 1217 } 1218 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1219 struct sk_buff *skb) 1220 { 1221 return 1; 1222 } 1223 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1224 struct sk_buff *skb) 1225 { 1226 return 1; 1227 } 1228 #endif 1229 1230 static __inline__ 1231 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family) 1232 { 1233 switch (family){ 1234 case AF_INET: 1235 return (xfrm_address_t *)&fl->u.ip4.daddr; 1236 case AF_INET6: 1237 return (xfrm_address_t *)&fl->u.ip6.daddr; 1238 } 1239 return NULL; 1240 } 1241 1242 static __inline__ 1243 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family) 1244 { 1245 switch (family){ 1246 case AF_INET: 1247 return (xfrm_address_t *)&fl->u.ip4.saddr; 1248 case AF_INET6: 1249 return (xfrm_address_t *)&fl->u.ip6.saddr; 1250 } 1251 return NULL; 1252 } 1253 1254 static __inline__ 1255 void xfrm_flowi_addr_get(const struct flowi *fl, 1256 xfrm_address_t *saddr, xfrm_address_t *daddr, 1257 unsigned short family) 1258 { 1259 switch(family) { 1260 case AF_INET: 1261 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4)); 1262 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4)); 1263 break; 1264 case AF_INET6: 1265 saddr->in6 = fl->u.ip6.saddr; 1266 daddr->in6 = fl->u.ip6.daddr; 1267 break; 1268 } 1269 } 1270 1271 static __inline__ int 1272 __xfrm4_state_addr_check(const struct xfrm_state *x, 1273 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1274 { 1275 if (daddr->a4 == x->id.daddr.a4 && 1276 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 1277 return 1; 1278 return 0; 1279 } 1280 1281 static __inline__ int 1282 __xfrm6_state_addr_check(const struct xfrm_state *x, 1283 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1284 { 1285 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 1286 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) || 1287 ipv6_addr_any((struct in6_addr *)saddr) || 1288 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 1289 return 1; 1290 return 0; 1291 } 1292 1293 static __inline__ int 1294 xfrm_state_addr_check(const struct xfrm_state *x, 1295 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1296 unsigned short family) 1297 { 1298 switch (family) { 1299 case AF_INET: 1300 return __xfrm4_state_addr_check(x, daddr, saddr); 1301 case AF_INET6: 1302 return __xfrm6_state_addr_check(x, daddr, saddr); 1303 } 1304 return 0; 1305 } 1306 1307 static __inline__ int 1308 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl, 1309 unsigned short family) 1310 { 1311 switch (family) { 1312 case AF_INET: 1313 return __xfrm4_state_addr_check(x, 1314 (const xfrm_address_t *)&fl->u.ip4.daddr, 1315 (const xfrm_address_t *)&fl->u.ip4.saddr); 1316 case AF_INET6: 1317 return __xfrm6_state_addr_check(x, 1318 (const xfrm_address_t *)&fl->u.ip6.daddr, 1319 (const xfrm_address_t *)&fl->u.ip6.saddr); 1320 } 1321 return 0; 1322 } 1323 1324 static inline int xfrm_state_kern(const struct xfrm_state *x) 1325 { 1326 return atomic_read(&x->tunnel_users); 1327 } 1328 1329 static inline bool xfrm_id_proto_valid(u8 proto) 1330 { 1331 switch (proto) { 1332 case IPPROTO_AH: 1333 case IPPROTO_ESP: 1334 case IPPROTO_COMP: 1335 #if IS_ENABLED(CONFIG_IPV6) 1336 case IPPROTO_ROUTING: 1337 case IPPROTO_DSTOPTS: 1338 #endif 1339 return true; 1340 default: 1341 return false; 1342 } 1343 } 1344 1345 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */ 1346 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 1347 { 1348 return (!userproto || proto == userproto || 1349 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 1350 proto == IPPROTO_ESP || 1351 proto == IPPROTO_COMP))); 1352 } 1353 1354 /* 1355 * xfrm algorithm information 1356 */ 1357 struct xfrm_algo_aead_info { 1358 char *geniv; 1359 u16 icv_truncbits; 1360 }; 1361 1362 struct xfrm_algo_auth_info { 1363 u16 icv_truncbits; 1364 u16 icv_fullbits; 1365 }; 1366 1367 struct xfrm_algo_encr_info { 1368 char *geniv; 1369 u16 blockbits; 1370 u16 defkeybits; 1371 }; 1372 1373 struct xfrm_algo_comp_info { 1374 u16 threshold; 1375 }; 1376 1377 struct xfrm_algo_desc { 1378 char *name; 1379 char *compat; 1380 u8 available:1; 1381 u8 pfkey_supported:1; 1382 union { 1383 struct xfrm_algo_aead_info aead; 1384 struct xfrm_algo_auth_info auth; 1385 struct xfrm_algo_encr_info encr; 1386 struct xfrm_algo_comp_info comp; 1387 } uinfo; 1388 struct sadb_alg desc; 1389 }; 1390 1391 /* XFRM protocol handlers. */ 1392 struct xfrm4_protocol { 1393 int (*handler)(struct sk_buff *skb); 1394 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1395 int encap_type); 1396 int (*cb_handler)(struct sk_buff *skb, int err); 1397 int (*err_handler)(struct sk_buff *skb, u32 info); 1398 1399 struct xfrm4_protocol __rcu *next; 1400 int priority; 1401 }; 1402 1403 struct xfrm6_protocol { 1404 int (*handler)(struct sk_buff *skb); 1405 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1406 int encap_type); 1407 int (*cb_handler)(struct sk_buff *skb, int err); 1408 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1409 u8 type, u8 code, int offset, __be32 info); 1410 1411 struct xfrm6_protocol __rcu *next; 1412 int priority; 1413 }; 1414 1415 /* XFRM tunnel handlers. */ 1416 struct xfrm_tunnel { 1417 int (*handler)(struct sk_buff *skb); 1418 int (*err_handler)(struct sk_buff *skb, u32 info); 1419 1420 struct xfrm_tunnel __rcu *next; 1421 int priority; 1422 }; 1423 1424 struct xfrm6_tunnel { 1425 int (*handler)(struct sk_buff *skb); 1426 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1427 u8 type, u8 code, int offset, __be32 info); 1428 struct xfrm6_tunnel __rcu *next; 1429 int priority; 1430 }; 1431 1432 void xfrm_init(void); 1433 void xfrm4_init(void); 1434 int xfrm_state_init(struct net *net); 1435 void xfrm_state_fini(struct net *net); 1436 void xfrm4_state_init(void); 1437 void xfrm4_protocol_init(void); 1438 #ifdef CONFIG_XFRM 1439 int xfrm6_init(void); 1440 void xfrm6_fini(void); 1441 int xfrm6_state_init(void); 1442 void xfrm6_state_fini(void); 1443 int xfrm6_protocol_init(void); 1444 void xfrm6_protocol_fini(void); 1445 #else 1446 static inline int xfrm6_init(void) 1447 { 1448 return 0; 1449 } 1450 static inline void xfrm6_fini(void) 1451 { 1452 ; 1453 } 1454 #endif 1455 1456 #ifdef CONFIG_XFRM_STATISTICS 1457 int xfrm_proc_init(struct net *net); 1458 void xfrm_proc_fini(struct net *net); 1459 #endif 1460 1461 int xfrm_sysctl_init(struct net *net); 1462 #ifdef CONFIG_SYSCTL 1463 void xfrm_sysctl_fini(struct net *net); 1464 #else 1465 static inline void xfrm_sysctl_fini(struct net *net) 1466 { 1467 } 1468 #endif 1469 1470 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 1471 struct xfrm_address_filter *filter); 1472 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1473 int (*func)(struct xfrm_state *, int, void*), void *); 1474 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net); 1475 struct xfrm_state *xfrm_state_alloc(struct net *net); 1476 void xfrm_state_free(struct xfrm_state *x); 1477 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr, 1478 const xfrm_address_t *saddr, 1479 const struct flowi *fl, 1480 struct xfrm_tmpl *tmpl, 1481 struct xfrm_policy *pol, int *err, 1482 unsigned short family, u32 if_id); 1483 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id, 1484 xfrm_address_t *daddr, 1485 xfrm_address_t *saddr, 1486 unsigned short family, 1487 u8 mode, u8 proto, u32 reqid); 1488 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1489 unsigned short family); 1490 int xfrm_state_check_expire(struct xfrm_state *x); 1491 void xfrm_state_insert(struct xfrm_state *x); 1492 int xfrm_state_add(struct xfrm_state *x); 1493 int xfrm_state_update(struct xfrm_state *x); 1494 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark, 1495 const xfrm_address_t *daddr, __be32 spi, 1496 u8 proto, unsigned short family); 1497 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1498 const xfrm_address_t *daddr, 1499 const xfrm_address_t *saddr, 1500 u8 proto, 1501 unsigned short family); 1502 #ifdef CONFIG_XFRM_SUB_POLICY 1503 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1504 unsigned short family); 1505 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1506 unsigned short family); 1507 #else 1508 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s, 1509 int n, unsigned short family) 1510 { 1511 } 1512 1513 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s, 1514 int n, unsigned short family) 1515 { 1516 } 1517 #endif 1518 1519 struct xfrmk_sadinfo { 1520 u32 sadhcnt; /* current hash bkts */ 1521 u32 sadhmcnt; /* max allowed hash bkts */ 1522 u32 sadcnt; /* current running count */ 1523 }; 1524 1525 struct xfrmk_spdinfo { 1526 u32 incnt; 1527 u32 outcnt; 1528 u32 fwdcnt; 1529 u32 inscnt; 1530 u32 outscnt; 1531 u32 fwdscnt; 1532 u32 spdhcnt; 1533 u32 spdhmcnt; 1534 }; 1535 1536 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1537 int xfrm_state_delete(struct xfrm_state *x); 1538 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync); 1539 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid); 1540 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); 1541 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); 1542 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq); 1543 int xfrm_init_replay(struct xfrm_state *x); 1544 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu); 1545 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload); 1546 int xfrm_init_state(struct xfrm_state *x); 1547 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type); 1548 int xfrm_input_resume(struct sk_buff *skb, int nexthdr); 1549 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb, 1550 int (*finish)(struct net *, struct sock *, 1551 struct sk_buff *)); 1552 int xfrm_trans_queue(struct sk_buff *skb, 1553 int (*finish)(struct net *, struct sock *, 1554 struct sk_buff *)); 1555 int xfrm_output_resume(struct sk_buff *skb, int err); 1556 int xfrm_output(struct sock *sk, struct sk_buff *skb); 1557 1558 #if IS_ENABLED(CONFIG_NET_PKTGEN) 1559 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb); 1560 #endif 1561 1562 void xfrm_local_error(struct sk_buff *skb, int mtu); 1563 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1564 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1565 int encap_type); 1566 int xfrm4_transport_finish(struct sk_buff *skb, int async); 1567 int xfrm4_rcv(struct sk_buff *skb); 1568 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1569 1570 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1571 { 1572 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL; 1573 XFRM_SPI_SKB_CB(skb)->family = AF_INET; 1574 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); 1575 return xfrm_input(skb, nexthdr, spi, 0); 1576 } 1577 1578 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1579 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb); 1580 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol); 1581 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol); 1582 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1583 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1584 void xfrm4_local_error(struct sk_buff *skb, u32 mtu); 1585 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1586 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi, 1587 struct ip6_tnl *t); 1588 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1589 int encap_type); 1590 int xfrm6_transport_finish(struct sk_buff *skb, int async); 1591 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t); 1592 int xfrm6_rcv(struct sk_buff *skb); 1593 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1594 xfrm_address_t *saddr, u8 proto); 1595 void xfrm6_local_error(struct sk_buff *skb, u32 mtu); 1596 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol); 1597 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol); 1598 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1599 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1600 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr); 1601 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr); 1602 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1603 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb); 1604 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, 1605 u8 **prevhdr); 1606 1607 #ifdef CONFIG_XFRM 1608 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu); 1609 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1610 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1611 int xfrm_user_policy(struct sock *sk, int optname, 1612 u8 __user *optval, int optlen); 1613 #else 1614 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 1615 { 1616 return -ENOPROTOOPT; 1617 } 1618 #endif 1619 1620 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif, 1621 const xfrm_address_t *saddr, 1622 const xfrm_address_t *daddr, 1623 int family, u32 mark); 1624 1625 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); 1626 1627 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); 1628 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, 1629 int (*func)(struct xfrm_policy *, int, int, void*), 1630 void *); 1631 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net); 1632 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1633 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u32 if_id, 1634 u8 type, int dir, 1635 struct xfrm_selector *sel, 1636 struct xfrm_sec_ctx *ctx, int delete, 1637 int *err); 1638 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u32 if_id, u8, 1639 int dir, u32 id, int delete, int *err); 1640 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid); 1641 void xfrm_policy_hash_rebuild(struct net *net); 1642 u32 xfrm_get_acqseq(void); 1643 int verify_spi_info(u8 proto, u32 min, u32 max); 1644 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 1645 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, 1646 u8 mode, u32 reqid, u32 if_id, u8 proto, 1647 const xfrm_address_t *daddr, 1648 const xfrm_address_t *saddr, int create, 1649 unsigned short family); 1650 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1651 1652 #ifdef CONFIG_XFRM_MIGRATE 1653 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1654 const struct xfrm_migrate *m, int num_bundles, 1655 const struct xfrm_kmaddress *k, 1656 const struct xfrm_encap_tmpl *encap); 1657 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net); 1658 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 1659 struct xfrm_migrate *m, 1660 struct xfrm_encap_tmpl *encap); 1661 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1662 struct xfrm_migrate *m, int num_bundles, 1663 struct xfrm_kmaddress *k, struct net *net, 1664 struct xfrm_encap_tmpl *encap); 1665 #endif 1666 1667 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1668 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid); 1669 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, 1670 xfrm_address_t *addr); 1671 1672 void xfrm_input_init(void); 1673 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1674 1675 void xfrm_probe_algs(void); 1676 int xfrm_count_pfkey_auth_supported(void); 1677 int xfrm_count_pfkey_enc_supported(void); 1678 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1679 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1680 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1681 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1682 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1683 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe); 1684 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe); 1685 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe); 1686 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, 1687 int probe); 1688 1689 static inline bool xfrm6_addr_equal(const xfrm_address_t *a, 1690 const xfrm_address_t *b) 1691 { 1692 return ipv6_addr_equal((const struct in6_addr *)a, 1693 (const struct in6_addr *)b); 1694 } 1695 1696 static inline bool xfrm_addr_equal(const xfrm_address_t *a, 1697 const xfrm_address_t *b, 1698 sa_family_t family) 1699 { 1700 switch (family) { 1701 default: 1702 case AF_INET: 1703 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0; 1704 case AF_INET6: 1705 return xfrm6_addr_equal(a, b); 1706 } 1707 } 1708 1709 static inline int xfrm_policy_id2dir(u32 index) 1710 { 1711 return index & 7; 1712 } 1713 1714 #ifdef CONFIG_XFRM 1715 static inline int xfrm_aevent_is_on(struct net *net) 1716 { 1717 struct sock *nlsk; 1718 int ret = 0; 1719 1720 rcu_read_lock(); 1721 nlsk = rcu_dereference(net->xfrm.nlsk); 1722 if (nlsk) 1723 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1724 rcu_read_unlock(); 1725 return ret; 1726 } 1727 1728 static inline int xfrm_acquire_is_on(struct net *net) 1729 { 1730 struct sock *nlsk; 1731 int ret = 0; 1732 1733 rcu_read_lock(); 1734 nlsk = rcu_dereference(net->xfrm.nlsk); 1735 if (nlsk) 1736 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE); 1737 rcu_read_unlock(); 1738 1739 return ret; 1740 } 1741 #endif 1742 1743 static inline unsigned int aead_len(struct xfrm_algo_aead *alg) 1744 { 1745 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1746 } 1747 1748 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg) 1749 { 1750 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1751 } 1752 1753 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg) 1754 { 1755 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1756 } 1757 1758 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn) 1759 { 1760 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32); 1761 } 1762 1763 #ifdef CONFIG_XFRM_MIGRATE 1764 static inline int xfrm_replay_clone(struct xfrm_state *x, 1765 struct xfrm_state *orig) 1766 { 1767 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn), 1768 GFP_KERNEL); 1769 if (!x->replay_esn) 1770 return -ENOMEM; 1771 1772 x->replay_esn->bmp_len = orig->replay_esn->bmp_len; 1773 x->replay_esn->replay_window = orig->replay_esn->replay_window; 1774 1775 x->preplay_esn = kmemdup(x->replay_esn, 1776 xfrm_replay_state_esn_len(x->replay_esn), 1777 GFP_KERNEL); 1778 if (!x->preplay_esn) { 1779 kfree(x->replay_esn); 1780 return -ENOMEM; 1781 } 1782 1783 return 0; 1784 } 1785 1786 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig) 1787 { 1788 return kmemdup(orig, aead_len(orig), GFP_KERNEL); 1789 } 1790 1791 1792 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1793 { 1794 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); 1795 } 1796 1797 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig) 1798 { 1799 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL); 1800 } 1801 1802 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1803 { 1804 int i; 1805 for (i = 0; i < n; i++) 1806 xfrm_state_put(*(states + i)); 1807 } 1808 1809 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1810 { 1811 int i; 1812 for (i = 0; i < n; i++) 1813 xfrm_state_delete(*(states + i)); 1814 } 1815 #endif 1816 1817 #ifdef CONFIG_XFRM 1818 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) 1819 { 1820 struct sec_path *sp = skb_sec_path(skb); 1821 1822 return sp->xvec[sp->len - 1]; 1823 } 1824 #endif 1825 1826 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb) 1827 { 1828 #ifdef CONFIG_XFRM 1829 struct sec_path *sp = skb_sec_path(skb); 1830 1831 if (!sp || !sp->olen || sp->len != sp->olen) 1832 return NULL; 1833 1834 return &sp->ovec[sp->olen - 1]; 1835 #else 1836 return NULL; 1837 #endif 1838 } 1839 1840 void __init xfrm_dev_init(void); 1841 1842 #ifdef CONFIG_XFRM_OFFLOAD 1843 void xfrm_dev_resume(struct sk_buff *skb); 1844 void xfrm_dev_backlog(struct softnet_data *sd); 1845 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again); 1846 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, 1847 struct xfrm_user_offload *xuo); 1848 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x); 1849 1850 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 1851 { 1852 struct xfrm_state_offload *xso = &x->xso; 1853 1854 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn) 1855 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x); 1856 } 1857 1858 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 1859 { 1860 struct xfrm_state *x = dst->xfrm; 1861 struct xfrm_dst *xdst; 1862 1863 if (!x || !x->type_offload) 1864 return false; 1865 1866 xdst = (struct xfrm_dst *) dst; 1867 if (!x->xso.offload_handle && !xdst->child->xfrm) 1868 return true; 1869 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) && 1870 !xdst->child->xfrm) 1871 return true; 1872 1873 return false; 1874 } 1875 1876 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 1877 { 1878 struct xfrm_state_offload *xso = &x->xso; 1879 1880 if (xso->dev) 1881 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x); 1882 } 1883 1884 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1885 { 1886 struct xfrm_state_offload *xso = &x->xso; 1887 struct net_device *dev = xso->dev; 1888 1889 if (dev && dev->xfrmdev_ops) { 1890 if (dev->xfrmdev_ops->xdo_dev_state_free) 1891 dev->xfrmdev_ops->xdo_dev_state_free(x); 1892 xso->dev = NULL; 1893 dev_put(dev); 1894 } 1895 } 1896 #else 1897 static inline void xfrm_dev_resume(struct sk_buff *skb) 1898 { 1899 } 1900 1901 static inline void xfrm_dev_backlog(struct softnet_data *sd) 1902 { 1903 } 1904 1905 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again) 1906 { 1907 return skb; 1908 } 1909 1910 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo) 1911 { 1912 return 0; 1913 } 1914 1915 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 1916 { 1917 } 1918 1919 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1920 { 1921 } 1922 1923 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) 1924 { 1925 return false; 1926 } 1927 1928 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 1929 { 1930 } 1931 1932 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 1933 { 1934 return false; 1935 } 1936 #endif 1937 1938 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) 1939 { 1940 if (attrs[XFRMA_MARK]) 1941 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark)); 1942 else 1943 m->v = m->m = 0; 1944 1945 return m->v & m->m; 1946 } 1947 1948 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m) 1949 { 1950 int ret = 0; 1951 1952 if (m->m | m->v) 1953 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); 1954 return ret; 1955 } 1956 1957 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x) 1958 { 1959 struct xfrm_mark *m = &x->props.smark; 1960 1961 return (m->v & m->m) | (mark & ~m->m); 1962 } 1963 1964 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id) 1965 { 1966 int ret = 0; 1967 1968 if (if_id) 1969 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id); 1970 return ret; 1971 } 1972 1973 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x, 1974 unsigned int family) 1975 { 1976 bool tunnel = false; 1977 1978 switch(family) { 1979 case AF_INET: 1980 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) 1981 tunnel = true; 1982 break; 1983 case AF_INET6: 1984 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) 1985 tunnel = true; 1986 break; 1987 } 1988 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL)) 1989 return -EINVAL; 1990 1991 return 0; 1992 } 1993 1994 #if IS_ENABLED(CONFIG_IPV6) 1995 static inline bool xfrm6_local_dontfrag(const struct sock *sk) 1996 { 1997 int proto; 1998 1999 if (!sk || sk->sk_family != AF_INET6) 2000 return false; 2001 2002 proto = sk->sk_protocol; 2003 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW) 2004 return inet6_sk(sk)->dontfrag; 2005 2006 return false; 2007 } 2008 #endif 2009 #endif /* _NET_XFRM_H */ 2010