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; 196 197 /* Data for care-of address */ 198 xfrm_address_t *coaddr; 199 200 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 201 struct xfrm_state *tunnel; 202 203 /* If a tunnel, number of users + 1 */ 204 atomic_t tunnel_users; 205 206 /* State for replay detection */ 207 struct xfrm_replay_state replay; 208 struct xfrm_replay_state_esn *replay_esn; 209 210 /* Replay detection state at the time we sent the last notification */ 211 struct xfrm_replay_state preplay; 212 struct xfrm_replay_state_esn *preplay_esn; 213 214 /* The functions for replay detection. */ 215 const struct xfrm_replay *repl; 216 217 /* internal flag that only holds state for delayed aevent at the 218 * moment 219 */ 220 u32 xflags; 221 222 /* Replay detection notification settings */ 223 u32 replay_maxage; 224 u32 replay_maxdiff; 225 226 /* Replay detection notification timer */ 227 struct timer_list rtimer; 228 229 /* Statistics */ 230 struct xfrm_stats stats; 231 232 struct xfrm_lifetime_cur curlft; 233 struct hrtimer mtimer; 234 235 struct xfrm_state_offload xso; 236 237 /* used to fix curlft->add_time when changing date */ 238 long saved_tmo; 239 240 /* Last used time */ 241 time64_t lastused; 242 243 struct page_frag xfrag; 244 245 /* Reference to data common to all the instances of this 246 * transformer. */ 247 const struct xfrm_type *type; 248 struct xfrm_mode inner_mode; 249 struct xfrm_mode inner_mode_iaf; 250 struct xfrm_mode outer_mode; 251 252 const struct xfrm_type_offload *type_offload; 253 254 /* Security context */ 255 struct xfrm_sec_ctx *security; 256 257 /* Private data of this transformer, format is opaque, 258 * interpreted by xfrm_type methods. */ 259 void *data; 260 }; 261 262 static inline struct net *xs_net(struct xfrm_state *x) 263 { 264 return read_pnet(&x->xs_net); 265 } 266 267 /* xflags - make enum if more show up */ 268 #define XFRM_TIME_DEFER 1 269 #define XFRM_SOFT_EXPIRE 2 270 271 enum { 272 XFRM_STATE_VOID, 273 XFRM_STATE_ACQ, 274 XFRM_STATE_VALID, 275 XFRM_STATE_ERROR, 276 XFRM_STATE_EXPIRED, 277 XFRM_STATE_DEAD 278 }; 279 280 /* callback structure passed from either netlink or pfkey */ 281 struct km_event { 282 union { 283 u32 hard; 284 u32 proto; 285 u32 byid; 286 u32 aevent; 287 u32 type; 288 } data; 289 290 u32 seq; 291 u32 portid; 292 u32 event; 293 struct net *net; 294 }; 295 296 struct xfrm_replay { 297 void (*advance)(struct xfrm_state *x, __be32 net_seq); 298 int (*check)(struct xfrm_state *x, 299 struct sk_buff *skb, 300 __be32 net_seq); 301 int (*recheck)(struct xfrm_state *x, 302 struct sk_buff *skb, 303 __be32 net_seq); 304 void (*notify)(struct xfrm_state *x, int event); 305 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb); 306 }; 307 308 struct xfrm_if_cb { 309 struct xfrm_if *(*decode_session)(struct sk_buff *skb, 310 unsigned short family); 311 }; 312 313 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb); 314 void xfrm_if_unregister_cb(void); 315 316 struct net_device; 317 struct xfrm_type; 318 struct xfrm_dst; 319 struct xfrm_policy_afinfo { 320 struct dst_ops *dst_ops; 321 struct dst_entry *(*dst_lookup)(struct net *net, 322 int tos, int oif, 323 const xfrm_address_t *saddr, 324 const xfrm_address_t *daddr, 325 u32 mark); 326 int (*get_saddr)(struct net *net, int oif, 327 xfrm_address_t *saddr, 328 xfrm_address_t *daddr, 329 u32 mark); 330 int (*fill_dst)(struct xfrm_dst *xdst, 331 struct net_device *dev, 332 const struct flowi *fl); 333 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig); 334 }; 335 336 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family); 337 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo); 338 void km_policy_notify(struct xfrm_policy *xp, int dir, 339 const struct km_event *c); 340 void km_state_notify(struct xfrm_state *x, const struct km_event *c); 341 342 struct xfrm_tmpl; 343 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, 344 struct xfrm_policy *pol); 345 void km_state_expired(struct xfrm_state *x, int hard, u32 portid); 346 int __xfrm_state_delete(struct xfrm_state *x); 347 348 struct xfrm_state_afinfo { 349 u8 family; 350 u8 proto; 351 352 const struct xfrm_type_offload *type_offload_esp; 353 354 const struct xfrm_type *type_esp; 355 const struct xfrm_type *type_ipip; 356 const struct xfrm_type *type_ipip6; 357 const struct xfrm_type *type_comp; 358 const struct xfrm_type *type_ah; 359 const struct xfrm_type *type_routing; 360 const struct xfrm_type *type_dstopts; 361 362 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb); 363 int (*output_finish)(struct sock *sk, struct sk_buff *skb); 364 int (*extract_input)(struct xfrm_state *x, 365 struct sk_buff *skb); 366 int (*extract_output)(struct xfrm_state *x, 367 struct sk_buff *skb); 368 int (*transport_finish)(struct sk_buff *skb, 369 int async); 370 void (*local_error)(struct sk_buff *skb, u32 mtu); 371 }; 372 373 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 374 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 375 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); 376 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family); 377 378 struct xfrm_input_afinfo { 379 unsigned int family; 380 int (*callback)(struct sk_buff *skb, u8 protocol, 381 int err); 382 }; 383 384 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo); 385 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo); 386 387 void xfrm_flush_gc(void); 388 void xfrm_state_delete_tunnel(struct xfrm_state *x); 389 390 struct xfrm_type { 391 char *description; 392 struct module *owner; 393 u8 proto; 394 u8 flags; 395 #define XFRM_TYPE_NON_FRAGMENT 1 396 #define XFRM_TYPE_REPLAY_PROT 2 397 #define XFRM_TYPE_LOCAL_COADDR 4 398 #define XFRM_TYPE_REMOTE_COADDR 8 399 400 int (*init_state)(struct xfrm_state *x); 401 void (*destructor)(struct xfrm_state *); 402 int (*input)(struct xfrm_state *, struct sk_buff *skb); 403 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 404 int (*reject)(struct xfrm_state *, struct sk_buff *, 405 const struct flowi *); 406 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **); 407 }; 408 409 int xfrm_register_type(const struct xfrm_type *type, unsigned short family); 410 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); 411 412 struct xfrm_type_offload { 413 char *description; 414 struct module *owner; 415 u8 proto; 416 void (*encap)(struct xfrm_state *, struct sk_buff *pskb); 417 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb); 418 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features); 419 }; 420 421 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family); 422 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family); 423 424 static inline int xfrm_af2proto(unsigned int family) 425 { 426 switch(family) { 427 case AF_INET: 428 return IPPROTO_IPIP; 429 case AF_INET6: 430 return IPPROTO_IPV6; 431 default: 432 return 0; 433 } 434 } 435 436 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto) 437 { 438 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) || 439 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6)) 440 return &x->inner_mode; 441 else 442 return &x->inner_mode_iaf; 443 } 444 445 struct xfrm_tmpl { 446 /* id in template is interpreted as: 447 * daddr - destination of tunnel, may be zero for transport mode. 448 * spi - zero to acquire spi. Not zero if spi is static, then 449 * daddr must be fixed too. 450 * proto - AH/ESP/IPCOMP 451 */ 452 struct xfrm_id id; 453 454 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 455 xfrm_address_t saddr; 456 457 unsigned short encap_family; 458 459 u32 reqid; 460 461 /* Mode: transport, tunnel etc. */ 462 u8 mode; 463 464 /* Sharing mode: unique, this session only, this user only etc. */ 465 u8 share; 466 467 /* May skip this transfomration if no SA is found */ 468 u8 optional; 469 470 /* Skip aalgos/ealgos/calgos checks. */ 471 u8 allalgs; 472 473 /* Bit mask of algos allowed for acquisition */ 474 u32 aalgos; 475 u32 ealgos; 476 u32 calgos; 477 }; 478 479 #define XFRM_MAX_DEPTH 6 480 #define XFRM_MAX_OFFLOAD_DEPTH 1 481 482 struct xfrm_policy_walk_entry { 483 struct list_head all; 484 u8 dead; 485 }; 486 487 struct xfrm_policy_walk { 488 struct xfrm_policy_walk_entry walk; 489 u8 type; 490 u32 seq; 491 }; 492 493 struct xfrm_policy_queue { 494 struct sk_buff_head hold_queue; 495 struct timer_list hold_timer; 496 unsigned long timeout; 497 }; 498 499 struct xfrm_policy { 500 possible_net_t xp_net; 501 struct hlist_node bydst; 502 struct hlist_node byidx; 503 504 /* This lock only affects elements except for entry. */ 505 rwlock_t lock; 506 refcount_t refcnt; 507 u32 pos; 508 struct timer_list timer; 509 510 atomic_t genid; 511 u32 priority; 512 u32 index; 513 u32 if_id; 514 struct xfrm_mark mark; 515 struct xfrm_selector selector; 516 struct xfrm_lifetime_cfg lft; 517 struct xfrm_lifetime_cur curlft; 518 struct xfrm_policy_walk_entry walk; 519 struct xfrm_policy_queue polq; 520 bool bydst_reinsert; 521 u8 type; 522 u8 action; 523 u8 flags; 524 u8 xfrm_nr; 525 u16 family; 526 struct xfrm_sec_ctx *security; 527 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 528 struct hlist_node bydst_inexact_list; 529 struct rcu_head rcu; 530 }; 531 532 static inline struct net *xp_net(const struct xfrm_policy *xp) 533 { 534 return read_pnet(&xp->xp_net); 535 } 536 537 struct xfrm_kmaddress { 538 xfrm_address_t local; 539 xfrm_address_t remote; 540 u32 reserved; 541 u16 family; 542 }; 543 544 struct xfrm_migrate { 545 xfrm_address_t old_daddr; 546 xfrm_address_t old_saddr; 547 xfrm_address_t new_daddr; 548 xfrm_address_t new_saddr; 549 u8 proto; 550 u8 mode; 551 u16 reserved; 552 u32 reqid; 553 u16 old_family; 554 u16 new_family; 555 }; 556 557 #define XFRM_KM_TIMEOUT 30 558 /* what happened */ 559 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 560 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 561 562 /* default aevent timeout in units of 100ms */ 563 #define XFRM_AE_ETIME 10 564 /* Async Event timer multiplier */ 565 #define XFRM_AE_ETH_M 10 566 /* default seq threshold size */ 567 #define XFRM_AE_SEQT_SIZE 2 568 569 struct xfrm_mgr { 570 struct list_head list; 571 int (*notify)(struct xfrm_state *x, const struct km_event *c); 572 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp); 573 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 574 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 575 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c); 576 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 577 int (*migrate)(const struct xfrm_selector *sel, 578 u8 dir, u8 type, 579 const struct xfrm_migrate *m, 580 int num_bundles, 581 const struct xfrm_kmaddress *k, 582 const struct xfrm_encap_tmpl *encap); 583 bool (*is_alive)(const struct km_event *c); 584 }; 585 586 int xfrm_register_km(struct xfrm_mgr *km); 587 int xfrm_unregister_km(struct xfrm_mgr *km); 588 589 struct xfrm_tunnel_skb_cb { 590 union { 591 struct inet_skb_parm h4; 592 struct inet6_skb_parm h6; 593 } header; 594 595 union { 596 struct ip_tunnel *ip4; 597 struct ip6_tnl *ip6; 598 } tunnel; 599 }; 600 601 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0])) 602 603 /* 604 * This structure is used for the duration where packets are being 605 * transformed by IPsec. As soon as the packet leaves IPsec the 606 * area beyond the generic IP part may be overwritten. 607 */ 608 struct xfrm_skb_cb { 609 struct xfrm_tunnel_skb_cb header; 610 611 /* Sequence number for replay protection. */ 612 union { 613 struct { 614 __u32 low; 615 __u32 hi; 616 } output; 617 struct { 618 __be32 low; 619 __be32 hi; 620 } input; 621 } seq; 622 }; 623 624 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) 625 626 /* 627 * This structure is used by the afinfo prepare_input/prepare_output functions 628 * to transmit header information to the mode input/output functions. 629 */ 630 struct xfrm_mode_skb_cb { 631 struct xfrm_tunnel_skb_cb header; 632 633 /* Copied from header for IPv4, always set to zero and DF for IPv6. */ 634 __be16 id; 635 __be16 frag_off; 636 637 /* IP header length (excluding options or extension headers). */ 638 u8 ihl; 639 640 /* TOS for IPv4, class for IPv6. */ 641 u8 tos; 642 643 /* TTL for IPv4, hop limitfor IPv6. */ 644 u8 ttl; 645 646 /* Protocol for IPv4, NH for IPv6. */ 647 u8 protocol; 648 649 /* Option length for IPv4, zero for IPv6. */ 650 u8 optlen; 651 652 /* Used by IPv6 only, zero for IPv4. */ 653 u8 flow_lbl[3]; 654 }; 655 656 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0])) 657 658 /* 659 * This structure is used by the input processing to locate the SPI and 660 * related information. 661 */ 662 struct xfrm_spi_skb_cb { 663 struct xfrm_tunnel_skb_cb header; 664 665 unsigned int daddroff; 666 unsigned int family; 667 __be32 seq; 668 }; 669 670 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0])) 671 672 #ifdef CONFIG_AUDITSYSCALL 673 static inline struct audit_buffer *xfrm_audit_start(const char *op) 674 { 675 struct audit_buffer *audit_buf = NULL; 676 677 if (audit_enabled == AUDIT_OFF) 678 return NULL; 679 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC, 680 AUDIT_MAC_IPSEC_EVENT); 681 if (audit_buf == NULL) 682 return NULL; 683 audit_log_format(audit_buf, "op=%s", op); 684 return audit_buf; 685 } 686 687 static inline void xfrm_audit_helper_usrinfo(bool task_valid, 688 struct audit_buffer *audit_buf) 689 { 690 const unsigned int auid = from_kuid(&init_user_ns, task_valid ? 691 audit_get_loginuid(current) : 692 INVALID_UID); 693 const unsigned int ses = task_valid ? audit_get_sessionid(current) : 694 AUDIT_SID_UNSET; 695 696 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses); 697 audit_log_task_context(audit_buf); 698 } 699 700 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid); 701 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 702 bool task_valid); 703 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid); 704 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid); 705 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 706 struct sk_buff *skb); 707 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb, 708 __be32 net_seq); 709 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family); 710 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi, 711 __be32 net_seq); 712 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb, 713 u8 proto); 714 #else 715 716 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 717 bool task_valid) 718 { 719 } 720 721 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 722 bool task_valid) 723 { 724 } 725 726 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result, 727 bool task_valid) 728 { 729 } 730 731 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result, 732 bool task_valid) 733 { 734 } 735 736 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 737 struct sk_buff *skb) 738 { 739 } 740 741 static inline void xfrm_audit_state_replay(struct xfrm_state *x, 742 struct sk_buff *skb, __be32 net_seq) 743 { 744 } 745 746 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb, 747 u16 family) 748 { 749 } 750 751 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 752 __be32 net_spi, __be32 net_seq) 753 { 754 } 755 756 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x, 757 struct sk_buff *skb, u8 proto) 758 { 759 } 760 #endif /* CONFIG_AUDITSYSCALL */ 761 762 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 763 { 764 if (likely(policy != NULL)) 765 refcount_inc(&policy->refcnt); 766 } 767 768 void xfrm_policy_destroy(struct xfrm_policy *policy); 769 770 static inline void xfrm_pol_put(struct xfrm_policy *policy) 771 { 772 if (refcount_dec_and_test(&policy->refcnt)) 773 xfrm_policy_destroy(policy); 774 } 775 776 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 777 { 778 int i; 779 for (i = npols - 1; i >= 0; --i) 780 xfrm_pol_put(pols[i]); 781 } 782 783 void __xfrm_state_destroy(struct xfrm_state *, bool); 784 785 static inline void __xfrm_state_put(struct xfrm_state *x) 786 { 787 refcount_dec(&x->refcnt); 788 } 789 790 static inline void xfrm_state_put(struct xfrm_state *x) 791 { 792 if (refcount_dec_and_test(&x->refcnt)) 793 __xfrm_state_destroy(x, false); 794 } 795 796 static inline void xfrm_state_put_sync(struct xfrm_state *x) 797 { 798 if (refcount_dec_and_test(&x->refcnt)) 799 __xfrm_state_destroy(x, true); 800 } 801 802 static inline void xfrm_state_hold(struct xfrm_state *x) 803 { 804 refcount_inc(&x->refcnt); 805 } 806 807 static inline bool addr_match(const void *token1, const void *token2, 808 unsigned int prefixlen) 809 { 810 const __be32 *a1 = token1; 811 const __be32 *a2 = token2; 812 unsigned int pdw; 813 unsigned int pbi; 814 815 pdw = prefixlen >> 5; /* num of whole u32 in prefix */ 816 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 817 818 if (pdw) 819 if (memcmp(a1, a2, pdw << 2)) 820 return false; 821 822 if (pbi) { 823 __be32 mask; 824 825 mask = htonl((0xffffffff) << (32 - pbi)); 826 827 if ((a1[pdw] ^ a2[pdw]) & mask) 828 return false; 829 } 830 831 return true; 832 } 833 834 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen) 835 { 836 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */ 837 if (sizeof(long) == 4 && prefixlen == 0) 838 return true; 839 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen))); 840 } 841 842 static __inline__ 843 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli) 844 { 845 __be16 port; 846 switch(fl->flowi_proto) { 847 case IPPROTO_TCP: 848 case IPPROTO_UDP: 849 case IPPROTO_UDPLITE: 850 case IPPROTO_SCTP: 851 port = uli->ports.sport; 852 break; 853 case IPPROTO_ICMP: 854 case IPPROTO_ICMPV6: 855 port = htons(uli->icmpt.type); 856 break; 857 case IPPROTO_MH: 858 port = htons(uli->mht.type); 859 break; 860 case IPPROTO_GRE: 861 port = htons(ntohl(uli->gre_key) >> 16); 862 break; 863 default: 864 port = 0; /*XXX*/ 865 } 866 return port; 867 } 868 869 static __inline__ 870 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli) 871 { 872 __be16 port; 873 switch(fl->flowi_proto) { 874 case IPPROTO_TCP: 875 case IPPROTO_UDP: 876 case IPPROTO_UDPLITE: 877 case IPPROTO_SCTP: 878 port = uli->ports.dport; 879 break; 880 case IPPROTO_ICMP: 881 case IPPROTO_ICMPV6: 882 port = htons(uli->icmpt.code); 883 break; 884 case IPPROTO_GRE: 885 port = htons(ntohl(uli->gre_key) & 0xffff); 886 break; 887 default: 888 port = 0; /*XXX*/ 889 } 890 return port; 891 } 892 893 bool xfrm_selector_match(const struct xfrm_selector *sel, 894 const struct flowi *fl, unsigned short family); 895 896 #ifdef CONFIG_SECURITY_NETWORK_XFRM 897 /* If neither has a context --> match 898 * Otherwise, both must have a context and the sids, doi, alg must match 899 */ 900 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 901 { 902 return ((!s1 && !s2) || 903 (s1 && s2 && 904 (s1->ctx_sid == s2->ctx_sid) && 905 (s1->ctx_doi == s2->ctx_doi) && 906 (s1->ctx_alg == s2->ctx_alg))); 907 } 908 #else 909 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 910 { 911 return true; 912 } 913 #endif 914 915 /* A struct encoding bundle of transformations to apply to some set of flow. 916 * 917 * xdst->child points to the next element of bundle. 918 * dst->xfrm points to an instanse of transformer. 919 * 920 * Due to unfortunate limitations of current routing cache, which we 921 * have no time to fix, it mirrors struct rtable and bound to the same 922 * routing key, including saddr,daddr. However, we can have many of 923 * bundles differing by session id. All the bundles grow from a parent 924 * policy rule. 925 */ 926 struct xfrm_dst { 927 union { 928 struct dst_entry dst; 929 struct rtable rt; 930 struct rt6_info rt6; 931 } u; 932 struct dst_entry *route; 933 struct dst_entry *child; 934 struct dst_entry *path; 935 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; 936 int num_pols, num_xfrms; 937 u32 xfrm_genid; 938 u32 policy_genid; 939 u32 route_mtu_cached; 940 u32 child_mtu_cached; 941 u32 route_cookie; 942 u32 path_cookie; 943 }; 944 945 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst) 946 { 947 #ifdef CONFIG_XFRM 948 if (dst->xfrm) { 949 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst; 950 951 return xdst->path; 952 } 953 #endif 954 return (struct dst_entry *) dst; 955 } 956 957 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst) 958 { 959 #ifdef CONFIG_XFRM 960 if (dst->xfrm) { 961 struct xfrm_dst *xdst = (struct xfrm_dst *) dst; 962 return xdst->child; 963 } 964 #endif 965 return NULL; 966 } 967 968 #ifdef CONFIG_XFRM 969 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child) 970 { 971 xdst->child = child; 972 } 973 974 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 975 { 976 xfrm_pols_put(xdst->pols, xdst->num_pols); 977 dst_release(xdst->route); 978 if (likely(xdst->u.dst.xfrm)) 979 xfrm_state_put(xdst->u.dst.xfrm); 980 } 981 #endif 982 983 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 984 985 struct xfrm_if_parms { 986 char name[IFNAMSIZ]; /* name of XFRM device */ 987 int link; /* ifindex of underlying L2 interface */ 988 u32 if_id; /* interface identifyer */ 989 }; 990 991 struct xfrm_if { 992 struct xfrm_if __rcu *next; /* next interface in list */ 993 struct net_device *dev; /* virtual device associated with interface */ 994 struct net_device *phydev; /* physical device */ 995 struct net *net; /* netns for packet i/o */ 996 struct xfrm_if_parms p; /* interface parms */ 997 998 struct gro_cells gro_cells; 999 }; 1000 1001 struct xfrm_offload { 1002 /* Output sequence number for replay protection on offloading. */ 1003 struct { 1004 __u32 low; 1005 __u32 hi; 1006 } seq; 1007 1008 __u32 flags; 1009 #define SA_DELETE_REQ 1 1010 #define CRYPTO_DONE 2 1011 #define CRYPTO_NEXT_DONE 4 1012 #define CRYPTO_FALLBACK 8 1013 #define XFRM_GSO_SEGMENT 16 1014 #define XFRM_GRO 32 1015 #define XFRM_ESP_NO_TRAILER 64 1016 #define XFRM_DEV_RESUME 128 1017 1018 __u32 status; 1019 #define CRYPTO_SUCCESS 1 1020 #define CRYPTO_GENERIC_ERROR 2 1021 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4 1022 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8 1023 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16 1024 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32 1025 #define CRYPTO_INVALID_PACKET_SYNTAX 64 1026 #define CRYPTO_INVALID_PROTOCOL 128 1027 1028 __u8 proto; 1029 }; 1030 1031 struct sec_path { 1032 int len; 1033 int olen; 1034 1035 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 1036 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH]; 1037 }; 1038 1039 struct sec_path *secpath_set(struct sk_buff *skb); 1040 1041 static inline void 1042 secpath_reset(struct sk_buff *skb) 1043 { 1044 #ifdef CONFIG_XFRM 1045 skb_ext_del(skb, SKB_EXT_SEC_PATH); 1046 #endif 1047 } 1048 1049 static inline int 1050 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family) 1051 { 1052 switch (family) { 1053 case AF_INET: 1054 return addr->a4 == 0; 1055 case AF_INET6: 1056 return ipv6_addr_any(&addr->in6); 1057 } 1058 return 0; 1059 } 1060 1061 static inline int 1062 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1063 { 1064 return (tmpl->saddr.a4 && 1065 tmpl->saddr.a4 != x->props.saddr.a4); 1066 } 1067 1068 static inline int 1069 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1070 { 1071 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 1072 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 1073 } 1074 1075 static inline int 1076 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family) 1077 { 1078 switch (family) { 1079 case AF_INET: 1080 return __xfrm4_state_addr_cmp(tmpl, x); 1081 case AF_INET6: 1082 return __xfrm6_state_addr_cmp(tmpl, x); 1083 } 1084 return !0; 1085 } 1086 1087 #ifdef CONFIG_XFRM 1088 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, 1089 unsigned short family); 1090 1091 static inline int __xfrm_policy_check2(struct sock *sk, int dir, 1092 struct sk_buff *skb, 1093 unsigned int family, int reverse) 1094 { 1095 struct net *net = dev_net(skb->dev); 1096 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); 1097 1098 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 1099 return __xfrm_policy_check(sk, ndir, skb, family); 1100 1101 return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) || 1102 (skb_dst(skb)->flags & DST_NOPOLICY) || 1103 __xfrm_policy_check(sk, ndir, skb, family); 1104 } 1105 1106 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1107 { 1108 return __xfrm_policy_check2(sk, dir, skb, family, 0); 1109 } 1110 1111 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1112 { 1113 return xfrm_policy_check(sk, dir, skb, AF_INET); 1114 } 1115 1116 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1117 { 1118 return xfrm_policy_check(sk, dir, skb, AF_INET6); 1119 } 1120 1121 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1122 struct sk_buff *skb) 1123 { 1124 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); 1125 } 1126 1127 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1128 struct sk_buff *skb) 1129 { 1130 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); 1131 } 1132 1133 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1134 unsigned int family, int reverse); 1135 1136 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1137 unsigned int family) 1138 { 1139 return __xfrm_decode_session(skb, fl, family, 0); 1140 } 1141 1142 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1143 struct flowi *fl, 1144 unsigned int family) 1145 { 1146 return __xfrm_decode_session(skb, fl, family, 1); 1147 } 1148 1149 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 1150 1151 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 1152 { 1153 struct net *net = dev_net(skb->dev); 1154 1155 return !net->xfrm.policy_count[XFRM_POLICY_OUT] || 1156 (skb_dst(skb)->flags & DST_NOXFRM) || 1157 __xfrm_route_forward(skb, family); 1158 } 1159 1160 static inline int xfrm4_route_forward(struct sk_buff *skb) 1161 { 1162 return xfrm_route_forward(skb, AF_INET); 1163 } 1164 1165 static inline int xfrm6_route_forward(struct sk_buff *skb) 1166 { 1167 return xfrm_route_forward(skb, AF_INET6); 1168 } 1169 1170 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk); 1171 1172 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) 1173 { 1174 sk->sk_policy[0] = NULL; 1175 sk->sk_policy[1] = NULL; 1176 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1])) 1177 return __xfrm_sk_clone_policy(sk, osk); 1178 return 0; 1179 } 1180 1181 int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 1182 1183 static inline void xfrm_sk_free_policy(struct sock *sk) 1184 { 1185 struct xfrm_policy *pol; 1186 1187 pol = rcu_dereference_protected(sk->sk_policy[0], 1); 1188 if (unlikely(pol != NULL)) { 1189 xfrm_policy_delete(pol, XFRM_POLICY_MAX); 1190 sk->sk_policy[0] = NULL; 1191 } 1192 pol = rcu_dereference_protected(sk->sk_policy[1], 1); 1193 if (unlikely(pol != NULL)) { 1194 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1); 1195 sk->sk_policy[1] = NULL; 1196 } 1197 } 1198 1199 #else 1200 1201 static inline void xfrm_sk_free_policy(struct sock *sk) {} 1202 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; } 1203 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 1204 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 1205 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1206 { 1207 return 1; 1208 } 1209 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1210 { 1211 return 1; 1212 } 1213 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1214 { 1215 return 1; 1216 } 1217 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1218 struct flowi *fl, 1219 unsigned int family) 1220 { 1221 return -ENOSYS; 1222 } 1223 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1224 struct sk_buff *skb) 1225 { 1226 return 1; 1227 } 1228 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1229 struct sk_buff *skb) 1230 { 1231 return 1; 1232 } 1233 #endif 1234 1235 static __inline__ 1236 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family) 1237 { 1238 switch (family){ 1239 case AF_INET: 1240 return (xfrm_address_t *)&fl->u.ip4.daddr; 1241 case AF_INET6: 1242 return (xfrm_address_t *)&fl->u.ip6.daddr; 1243 } 1244 return NULL; 1245 } 1246 1247 static __inline__ 1248 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family) 1249 { 1250 switch (family){ 1251 case AF_INET: 1252 return (xfrm_address_t *)&fl->u.ip4.saddr; 1253 case AF_INET6: 1254 return (xfrm_address_t *)&fl->u.ip6.saddr; 1255 } 1256 return NULL; 1257 } 1258 1259 static __inline__ 1260 void xfrm_flowi_addr_get(const struct flowi *fl, 1261 xfrm_address_t *saddr, xfrm_address_t *daddr, 1262 unsigned short family) 1263 { 1264 switch(family) { 1265 case AF_INET: 1266 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4)); 1267 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4)); 1268 break; 1269 case AF_INET6: 1270 saddr->in6 = fl->u.ip6.saddr; 1271 daddr->in6 = fl->u.ip6.daddr; 1272 break; 1273 } 1274 } 1275 1276 static __inline__ int 1277 __xfrm4_state_addr_check(const struct xfrm_state *x, 1278 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1279 { 1280 if (daddr->a4 == x->id.daddr.a4 && 1281 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 1282 return 1; 1283 return 0; 1284 } 1285 1286 static __inline__ int 1287 __xfrm6_state_addr_check(const struct xfrm_state *x, 1288 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1289 { 1290 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 1291 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) || 1292 ipv6_addr_any((struct in6_addr *)saddr) || 1293 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 1294 return 1; 1295 return 0; 1296 } 1297 1298 static __inline__ int 1299 xfrm_state_addr_check(const struct xfrm_state *x, 1300 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1301 unsigned short family) 1302 { 1303 switch (family) { 1304 case AF_INET: 1305 return __xfrm4_state_addr_check(x, daddr, saddr); 1306 case AF_INET6: 1307 return __xfrm6_state_addr_check(x, daddr, saddr); 1308 } 1309 return 0; 1310 } 1311 1312 static __inline__ int 1313 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl, 1314 unsigned short family) 1315 { 1316 switch (family) { 1317 case AF_INET: 1318 return __xfrm4_state_addr_check(x, 1319 (const xfrm_address_t *)&fl->u.ip4.daddr, 1320 (const xfrm_address_t *)&fl->u.ip4.saddr); 1321 case AF_INET6: 1322 return __xfrm6_state_addr_check(x, 1323 (const xfrm_address_t *)&fl->u.ip6.daddr, 1324 (const xfrm_address_t *)&fl->u.ip6.saddr); 1325 } 1326 return 0; 1327 } 1328 1329 static inline int xfrm_state_kern(const struct xfrm_state *x) 1330 { 1331 return atomic_read(&x->tunnel_users); 1332 } 1333 1334 static inline bool xfrm_id_proto_valid(u8 proto) 1335 { 1336 switch (proto) { 1337 case IPPROTO_AH: 1338 case IPPROTO_ESP: 1339 case IPPROTO_COMP: 1340 #if IS_ENABLED(CONFIG_IPV6) 1341 case IPPROTO_ROUTING: 1342 case IPPROTO_DSTOPTS: 1343 #endif 1344 return true; 1345 default: 1346 return false; 1347 } 1348 } 1349 1350 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */ 1351 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 1352 { 1353 return (!userproto || proto == userproto || 1354 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 1355 proto == IPPROTO_ESP || 1356 proto == IPPROTO_COMP))); 1357 } 1358 1359 /* 1360 * xfrm algorithm information 1361 */ 1362 struct xfrm_algo_aead_info { 1363 char *geniv; 1364 u16 icv_truncbits; 1365 }; 1366 1367 struct xfrm_algo_auth_info { 1368 u16 icv_truncbits; 1369 u16 icv_fullbits; 1370 }; 1371 1372 struct xfrm_algo_encr_info { 1373 char *geniv; 1374 u16 blockbits; 1375 u16 defkeybits; 1376 }; 1377 1378 struct xfrm_algo_comp_info { 1379 u16 threshold; 1380 }; 1381 1382 struct xfrm_algo_desc { 1383 char *name; 1384 char *compat; 1385 u8 available:1; 1386 u8 pfkey_supported:1; 1387 union { 1388 struct xfrm_algo_aead_info aead; 1389 struct xfrm_algo_auth_info auth; 1390 struct xfrm_algo_encr_info encr; 1391 struct xfrm_algo_comp_info comp; 1392 } uinfo; 1393 struct sadb_alg desc; 1394 }; 1395 1396 /* XFRM protocol handlers. */ 1397 struct xfrm4_protocol { 1398 int (*handler)(struct sk_buff *skb); 1399 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1400 int encap_type); 1401 int (*cb_handler)(struct sk_buff *skb, int err); 1402 int (*err_handler)(struct sk_buff *skb, u32 info); 1403 1404 struct xfrm4_protocol __rcu *next; 1405 int priority; 1406 }; 1407 1408 struct xfrm6_protocol { 1409 int (*handler)(struct sk_buff *skb); 1410 int (*cb_handler)(struct sk_buff *skb, int err); 1411 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1412 u8 type, u8 code, int offset, __be32 info); 1413 1414 struct xfrm6_protocol __rcu *next; 1415 int priority; 1416 }; 1417 1418 /* XFRM tunnel handlers. */ 1419 struct xfrm_tunnel { 1420 int (*handler)(struct sk_buff *skb); 1421 int (*err_handler)(struct sk_buff *skb, u32 info); 1422 1423 struct xfrm_tunnel __rcu *next; 1424 int priority; 1425 }; 1426 1427 struct xfrm6_tunnel { 1428 int (*handler)(struct sk_buff *skb); 1429 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1430 u8 type, u8 code, int offset, __be32 info); 1431 struct xfrm6_tunnel __rcu *next; 1432 int priority; 1433 }; 1434 1435 void xfrm_init(void); 1436 void xfrm4_init(void); 1437 int xfrm_state_init(struct net *net); 1438 void xfrm_state_fini(struct net *net); 1439 void xfrm4_state_init(void); 1440 void xfrm4_protocol_init(void); 1441 #ifdef CONFIG_XFRM 1442 int xfrm6_init(void); 1443 void xfrm6_fini(void); 1444 int xfrm6_state_init(void); 1445 void xfrm6_state_fini(void); 1446 int xfrm6_protocol_init(void); 1447 void xfrm6_protocol_fini(void); 1448 #else 1449 static inline int xfrm6_init(void) 1450 { 1451 return 0; 1452 } 1453 static inline void xfrm6_fini(void) 1454 { 1455 ; 1456 } 1457 #endif 1458 1459 #ifdef CONFIG_XFRM_STATISTICS 1460 int xfrm_proc_init(struct net *net); 1461 void xfrm_proc_fini(struct net *net); 1462 #endif 1463 1464 int xfrm_sysctl_init(struct net *net); 1465 #ifdef CONFIG_SYSCTL 1466 void xfrm_sysctl_fini(struct net *net); 1467 #else 1468 static inline void xfrm_sysctl_fini(struct net *net) 1469 { 1470 } 1471 #endif 1472 1473 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 1474 struct xfrm_address_filter *filter); 1475 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1476 int (*func)(struct xfrm_state *, int, void*), void *); 1477 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net); 1478 struct xfrm_state *xfrm_state_alloc(struct net *net); 1479 void xfrm_state_free(struct xfrm_state *x); 1480 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr, 1481 const xfrm_address_t *saddr, 1482 const struct flowi *fl, 1483 struct xfrm_tmpl *tmpl, 1484 struct xfrm_policy *pol, int *err, 1485 unsigned short family, u32 if_id); 1486 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id, 1487 xfrm_address_t *daddr, 1488 xfrm_address_t *saddr, 1489 unsigned short family, 1490 u8 mode, u8 proto, u32 reqid); 1491 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1492 unsigned short family); 1493 int xfrm_state_check_expire(struct xfrm_state *x); 1494 void xfrm_state_insert(struct xfrm_state *x); 1495 int xfrm_state_add(struct xfrm_state *x); 1496 int xfrm_state_update(struct xfrm_state *x); 1497 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark, 1498 const xfrm_address_t *daddr, __be32 spi, 1499 u8 proto, unsigned short family); 1500 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1501 const xfrm_address_t *daddr, 1502 const xfrm_address_t *saddr, 1503 u8 proto, 1504 unsigned short family); 1505 #ifdef CONFIG_XFRM_SUB_POLICY 1506 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1507 unsigned short family); 1508 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1509 unsigned short family); 1510 #else 1511 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s, 1512 int n, unsigned short family) 1513 { 1514 } 1515 1516 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s, 1517 int n, unsigned short family) 1518 { 1519 } 1520 #endif 1521 1522 struct xfrmk_sadinfo { 1523 u32 sadhcnt; /* current hash bkts */ 1524 u32 sadhmcnt; /* max allowed hash bkts */ 1525 u32 sadcnt; /* current running count */ 1526 }; 1527 1528 struct xfrmk_spdinfo { 1529 u32 incnt; 1530 u32 outcnt; 1531 u32 fwdcnt; 1532 u32 inscnt; 1533 u32 outscnt; 1534 u32 fwdscnt; 1535 u32 spdhcnt; 1536 u32 spdhmcnt; 1537 }; 1538 1539 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1540 int xfrm_state_delete(struct xfrm_state *x); 1541 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync); 1542 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid); 1543 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); 1544 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); 1545 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq); 1546 int xfrm_init_replay(struct xfrm_state *x); 1547 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu); 1548 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload); 1549 int xfrm_init_state(struct xfrm_state *x); 1550 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type); 1551 int xfrm_input_resume(struct sk_buff *skb, int nexthdr); 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_header(struct sk_buff *skb); 1564 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1565 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1566 int encap_type); 1567 int xfrm4_transport_finish(struct sk_buff *skb, int async); 1568 int xfrm4_rcv(struct sk_buff *skb); 1569 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1570 1571 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1572 { 1573 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL; 1574 XFRM_SPI_SKB_CB(skb)->family = AF_INET; 1575 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); 1576 return xfrm_input(skb, nexthdr, spi, 0); 1577 } 1578 1579 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1580 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1581 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb); 1582 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol); 1583 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol); 1584 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1585 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1586 void xfrm4_local_error(struct sk_buff *skb, u32 mtu); 1587 int xfrm6_extract_header(struct sk_buff *skb); 1588 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1589 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi, 1590 struct ip6_tnl *t); 1591 int xfrm6_transport_finish(struct sk_buff *skb, int async); 1592 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t); 1593 int xfrm6_rcv(struct sk_buff *skb); 1594 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1595 xfrm_address_t *saddr, u8 proto); 1596 void xfrm6_local_error(struct sk_buff *skb, u32 mtu); 1597 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol); 1598 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol); 1599 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1600 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1601 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr); 1602 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr); 1603 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1604 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1605 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb); 1606 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, 1607 u8 **prevhdr); 1608 1609 #ifdef CONFIG_XFRM 1610 int xfrm4_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 1619 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb) 1620 { 1621 /* should not happen */ 1622 kfree_skb(skb); 1623 return 0; 1624 } 1625 #endif 1626 1627 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif, 1628 const xfrm_address_t *saddr, 1629 const xfrm_address_t *daddr, 1630 int family, u32 mark); 1631 1632 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); 1633 1634 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); 1635 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, 1636 int (*func)(struct xfrm_policy *, int, int, void*), 1637 void *); 1638 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net); 1639 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1640 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u32 if_id, 1641 u8 type, int dir, 1642 struct xfrm_selector *sel, 1643 struct xfrm_sec_ctx *ctx, int delete, 1644 int *err); 1645 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u32 if_id, u8, 1646 int dir, u32 id, int delete, int *err); 1647 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid); 1648 void xfrm_policy_hash_rebuild(struct net *net); 1649 u32 xfrm_get_acqseq(void); 1650 int verify_spi_info(u8 proto, u32 min, u32 max); 1651 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 1652 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, 1653 u8 mode, u32 reqid, u32 if_id, u8 proto, 1654 const xfrm_address_t *daddr, 1655 const xfrm_address_t *saddr, int create, 1656 unsigned short family); 1657 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1658 1659 #ifdef CONFIG_XFRM_MIGRATE 1660 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1661 const struct xfrm_migrate *m, int num_bundles, 1662 const struct xfrm_kmaddress *k, 1663 const struct xfrm_encap_tmpl *encap); 1664 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net); 1665 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 1666 struct xfrm_migrate *m, 1667 struct xfrm_encap_tmpl *encap); 1668 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1669 struct xfrm_migrate *m, int num_bundles, 1670 struct xfrm_kmaddress *k, struct net *net, 1671 struct xfrm_encap_tmpl *encap); 1672 #endif 1673 1674 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1675 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid); 1676 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, 1677 xfrm_address_t *addr); 1678 1679 void xfrm_input_init(void); 1680 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1681 1682 void xfrm_probe_algs(void); 1683 int xfrm_count_pfkey_auth_supported(void); 1684 int xfrm_count_pfkey_enc_supported(void); 1685 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1686 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1687 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1688 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1689 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1690 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe); 1691 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe); 1692 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe); 1693 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, 1694 int probe); 1695 1696 static inline bool xfrm6_addr_equal(const xfrm_address_t *a, 1697 const xfrm_address_t *b) 1698 { 1699 return ipv6_addr_equal((const struct in6_addr *)a, 1700 (const struct in6_addr *)b); 1701 } 1702 1703 static inline bool xfrm_addr_equal(const xfrm_address_t *a, 1704 const xfrm_address_t *b, 1705 sa_family_t family) 1706 { 1707 switch (family) { 1708 default: 1709 case AF_INET: 1710 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0; 1711 case AF_INET6: 1712 return xfrm6_addr_equal(a, b); 1713 } 1714 } 1715 1716 static inline int xfrm_policy_id2dir(u32 index) 1717 { 1718 return index & 7; 1719 } 1720 1721 #ifdef CONFIG_XFRM 1722 static inline int xfrm_aevent_is_on(struct net *net) 1723 { 1724 struct sock *nlsk; 1725 int ret = 0; 1726 1727 rcu_read_lock(); 1728 nlsk = rcu_dereference(net->xfrm.nlsk); 1729 if (nlsk) 1730 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1731 rcu_read_unlock(); 1732 return ret; 1733 } 1734 1735 static inline int xfrm_acquire_is_on(struct net *net) 1736 { 1737 struct sock *nlsk; 1738 int ret = 0; 1739 1740 rcu_read_lock(); 1741 nlsk = rcu_dereference(net->xfrm.nlsk); 1742 if (nlsk) 1743 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE); 1744 rcu_read_unlock(); 1745 1746 return ret; 1747 } 1748 #endif 1749 1750 static inline unsigned int aead_len(struct xfrm_algo_aead *alg) 1751 { 1752 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1753 } 1754 1755 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg) 1756 { 1757 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1758 } 1759 1760 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg) 1761 { 1762 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1763 } 1764 1765 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn) 1766 { 1767 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32); 1768 } 1769 1770 #ifdef CONFIG_XFRM_MIGRATE 1771 static inline int xfrm_replay_clone(struct xfrm_state *x, 1772 struct xfrm_state *orig) 1773 { 1774 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn), 1775 GFP_KERNEL); 1776 if (!x->replay_esn) 1777 return -ENOMEM; 1778 1779 x->replay_esn->bmp_len = orig->replay_esn->bmp_len; 1780 x->replay_esn->replay_window = orig->replay_esn->replay_window; 1781 1782 x->preplay_esn = kmemdup(x->replay_esn, 1783 xfrm_replay_state_esn_len(x->replay_esn), 1784 GFP_KERNEL); 1785 if (!x->preplay_esn) { 1786 kfree(x->replay_esn); 1787 return -ENOMEM; 1788 } 1789 1790 return 0; 1791 } 1792 1793 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig) 1794 { 1795 return kmemdup(orig, aead_len(orig), GFP_KERNEL); 1796 } 1797 1798 1799 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1800 { 1801 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); 1802 } 1803 1804 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig) 1805 { 1806 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL); 1807 } 1808 1809 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1810 { 1811 int i; 1812 for (i = 0; i < n; i++) 1813 xfrm_state_put(*(states + i)); 1814 } 1815 1816 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1817 { 1818 int i; 1819 for (i = 0; i < n; i++) 1820 xfrm_state_delete(*(states + i)); 1821 } 1822 #endif 1823 1824 #ifdef CONFIG_XFRM 1825 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) 1826 { 1827 struct sec_path *sp = skb_sec_path(skb); 1828 1829 return sp->xvec[sp->len - 1]; 1830 } 1831 #endif 1832 1833 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb) 1834 { 1835 #ifdef CONFIG_XFRM 1836 struct sec_path *sp = skb_sec_path(skb); 1837 1838 if (!sp || !sp->olen || sp->len != sp->olen) 1839 return NULL; 1840 1841 return &sp->ovec[sp->olen - 1]; 1842 #else 1843 return NULL; 1844 #endif 1845 } 1846 1847 void __init xfrm_dev_init(void); 1848 1849 #ifdef CONFIG_XFRM_OFFLOAD 1850 void xfrm_dev_resume(struct sk_buff *skb); 1851 void xfrm_dev_backlog(struct softnet_data *sd); 1852 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again); 1853 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, 1854 struct xfrm_user_offload *xuo); 1855 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x); 1856 1857 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 1858 { 1859 struct xfrm_state_offload *xso = &x->xso; 1860 1861 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn) 1862 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x); 1863 } 1864 1865 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 1866 { 1867 struct xfrm_state *x = dst->xfrm; 1868 struct xfrm_dst *xdst; 1869 1870 if (!x || !x->type_offload) 1871 return false; 1872 1873 xdst = (struct xfrm_dst *) dst; 1874 if (!x->xso.offload_handle && !xdst->child->xfrm) 1875 return true; 1876 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) && 1877 !xdst->child->xfrm) 1878 return true; 1879 1880 return false; 1881 } 1882 1883 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 1884 { 1885 struct xfrm_state_offload *xso = &x->xso; 1886 1887 if (xso->dev) 1888 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x); 1889 } 1890 1891 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1892 { 1893 struct xfrm_state_offload *xso = &x->xso; 1894 struct net_device *dev = xso->dev; 1895 1896 if (dev && dev->xfrmdev_ops) { 1897 if (dev->xfrmdev_ops->xdo_dev_state_free) 1898 dev->xfrmdev_ops->xdo_dev_state_free(x); 1899 xso->dev = NULL; 1900 dev_put(dev); 1901 } 1902 } 1903 #else 1904 static inline void xfrm_dev_resume(struct sk_buff *skb) 1905 { 1906 } 1907 1908 static inline void xfrm_dev_backlog(struct softnet_data *sd) 1909 { 1910 } 1911 1912 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again) 1913 { 1914 return skb; 1915 } 1916 1917 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo) 1918 { 1919 return 0; 1920 } 1921 1922 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 1923 { 1924 } 1925 1926 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1927 { 1928 } 1929 1930 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) 1931 { 1932 return false; 1933 } 1934 1935 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 1936 { 1937 } 1938 1939 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 1940 { 1941 return false; 1942 } 1943 #endif 1944 1945 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) 1946 { 1947 if (attrs[XFRMA_MARK]) 1948 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark)); 1949 else 1950 m->v = m->m = 0; 1951 1952 return m->v & m->m; 1953 } 1954 1955 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m) 1956 { 1957 int ret = 0; 1958 1959 if (m->m | m->v) 1960 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); 1961 return ret; 1962 } 1963 1964 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x) 1965 { 1966 struct xfrm_mark *m = &x->props.smark; 1967 1968 return (m->v & m->m) | (mark & ~m->m); 1969 } 1970 1971 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id) 1972 { 1973 int ret = 0; 1974 1975 if (if_id) 1976 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id); 1977 return ret; 1978 } 1979 1980 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x, 1981 unsigned int family) 1982 { 1983 bool tunnel = false; 1984 1985 switch(family) { 1986 case AF_INET: 1987 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) 1988 tunnel = true; 1989 break; 1990 case AF_INET6: 1991 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) 1992 tunnel = true; 1993 break; 1994 } 1995 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL)) 1996 return -EINVAL; 1997 1998 return 0; 1999 } 2000 #endif /* _NET_XFRM_H */ 2001