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 #include <linux/sockptr.h> 19 20 #include <net/sock.h> 21 #include <net/dst.h> 22 #include <net/ip.h> 23 #include <net/route.h> 24 #include <net/ipv6.h> 25 #include <net/ip6_fib.h> 26 #include <net/flow.h> 27 #include <net/gro_cells.h> 28 29 #include <linux/interrupt.h> 30 31 #ifdef CONFIG_XFRM_STATISTICS 32 #include <net/snmp.h> 33 #endif 34 35 #define XFRM_PROTO_ESP 50 36 #define XFRM_PROTO_AH 51 37 #define XFRM_PROTO_COMP 108 38 #define XFRM_PROTO_IPIP 4 39 #define XFRM_PROTO_IPV6 41 40 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING 41 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS 42 43 #define XFRM_ALIGN4(len) (((len) + 3) & ~3) 44 #define XFRM_ALIGN8(len) (((len) + 7) & ~7) 45 #define MODULE_ALIAS_XFRM_MODE(family, encap) \ 46 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap)) 47 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \ 48 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto)) 49 #define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \ 50 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto)) 51 52 #ifdef CONFIG_XFRM_STATISTICS 53 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field) 54 #else 55 #define XFRM_INC_STATS(net, field) ((void)(net)) 56 #endif 57 58 59 /* Organization of SPD aka "XFRM rules" 60 ------------------------------------ 61 62 Basic objects: 63 - policy rule, struct xfrm_policy (=SPD entry) 64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) 65 - instance of a transformer, struct xfrm_state (=SA) 66 - template to clone xfrm_state, struct xfrm_tmpl 67 68 SPD is plain linear list of xfrm_policy rules, ordered by priority. 69 (To be compatible with existing pfkeyv2 implementations, 70 many rules with priority of 0x7fffffff are allowed to exist and 71 such rules are ordered in an unpredictable way, thanks to bsd folks.) 72 73 Lookup is plain linear search until the first match with selector. 74 75 If "action" is "block", then we prohibit the flow, otherwise: 76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, 77 policy entry has list of up to XFRM_MAX_DEPTH transformations, 78 described by templates xfrm_tmpl. Each template is resolved 79 to a complete xfrm_state (see below) and we pack bundle of transformations 80 to a dst_entry returned to requestor. 81 82 dst -. xfrm .-> xfrm_state #1 83 |---. child .-> dst -. xfrm .-> xfrm_state #2 84 |---. child .-> dst -. xfrm .-> xfrm_state #3 85 |---. child .-> NULL 86 87 Bundles are cached at xrfm_policy struct (field ->bundles). 88 89 90 Resolution of xrfm_tmpl 91 ----------------------- 92 Template contains: 93 1. ->mode Mode: transport or tunnel 94 2. ->id.proto Protocol: AH/ESP/IPCOMP 95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. 96 Q: allow to resolve security gateway? 97 4. ->id.spi If not zero, static SPI. 98 5. ->saddr Local tunnel endpoint, ignored for transport mode. 99 6. ->algos List of allowed algos. Plain bitmask now. 100 Q: ealgos, aalgos, calgos. What a mess... 101 7. ->share Sharing mode. 102 Q: how to implement private sharing mode? To add struct sock* to 103 flow id? 104 105 Having this template we search through SAD searching for entries 106 with appropriate mode/proto/algo, permitted by selector. 107 If no appropriate entry found, it is requested from key manager. 108 109 PROBLEMS: 110 Q: How to find all the bundles referring to a physical path for 111 PMTU discovery? Seems, dst should contain list of all parents... 112 and enter to infinite locking hierarchy disaster. 113 No! It is easier, we will not search for them, let them find us. 114 We add genid to each dst plus pointer to genid of raw IP route, 115 pmtu disc will update pmtu on raw IP route and increase its genid. 116 dst_check() will see this for top level and trigger resyncing 117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved. 118 */ 119 120 struct xfrm_state_walk { 121 struct list_head all; 122 u8 state; 123 u8 dying; 124 u8 proto; 125 u32 seq; 126 struct xfrm_address_filter *filter; 127 }; 128 129 struct xfrm_state_offload { 130 struct net_device *dev; 131 struct net_device *real_dev; 132 unsigned long offload_handle; 133 unsigned int num_exthdrs; 134 u8 flags; 135 }; 136 137 struct xfrm_mode { 138 u8 encap; 139 u8 family; 140 u8 flags; 141 }; 142 143 /* Flags for xfrm_mode. */ 144 enum { 145 XFRM_MODE_FLAG_TUNNEL = 1, 146 }; 147 148 /* Full description of state of transformer. */ 149 struct xfrm_state { 150 possible_net_t xs_net; 151 union { 152 struct hlist_node gclist; 153 struct hlist_node bydst; 154 }; 155 struct hlist_node bysrc; 156 struct hlist_node byspi; 157 158 refcount_t refcnt; 159 spinlock_t lock; 160 161 struct xfrm_id id; 162 struct xfrm_selector sel; 163 struct xfrm_mark mark; 164 u32 if_id; 165 u32 tfcpad; 166 167 u32 genid; 168 169 /* Key manager bits */ 170 struct xfrm_state_walk km; 171 172 /* Parameters of this state. */ 173 struct { 174 u32 reqid; 175 u8 mode; 176 u8 replay_window; 177 u8 aalgo, ealgo, calgo; 178 u8 flags; 179 u16 family; 180 xfrm_address_t saddr; 181 int header_len; 182 int trailer_len; 183 u32 extra_flags; 184 struct xfrm_mark smark; 185 } props; 186 187 struct xfrm_lifetime_cfg lft; 188 189 /* Data for transformer */ 190 struct xfrm_algo_auth *aalg; 191 struct xfrm_algo *ealg; 192 struct xfrm_algo *calg; 193 struct xfrm_algo_aead *aead; 194 const char *geniv; 195 196 /* Data for encapsulator */ 197 struct xfrm_encap_tmpl *encap; 198 struct sock __rcu *encap_sk; 199 200 /* Data for care-of address */ 201 xfrm_address_t *coaddr; 202 203 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 204 struct xfrm_state *tunnel; 205 206 /* If a tunnel, number of users + 1 */ 207 atomic_t tunnel_users; 208 209 /* State for replay detection */ 210 struct xfrm_replay_state replay; 211 struct xfrm_replay_state_esn *replay_esn; 212 213 /* Replay detection state at the time we sent the last notification */ 214 struct xfrm_replay_state preplay; 215 struct xfrm_replay_state_esn *preplay_esn; 216 217 /* The functions for replay detection. */ 218 const struct xfrm_replay *repl; 219 220 /* internal flag that only holds state for delayed aevent at the 221 * moment 222 */ 223 u32 xflags; 224 225 /* Replay detection notification settings */ 226 u32 replay_maxage; 227 u32 replay_maxdiff; 228 229 /* Replay detection notification timer */ 230 struct timer_list rtimer; 231 232 /* Statistics */ 233 struct xfrm_stats stats; 234 235 struct xfrm_lifetime_cur curlft; 236 struct hrtimer mtimer; 237 238 struct xfrm_state_offload xso; 239 240 /* used to fix curlft->add_time when changing date */ 241 long saved_tmo; 242 243 /* Last used time */ 244 time64_t lastused; 245 246 struct page_frag xfrag; 247 248 /* Reference to data common to all the instances of this 249 * transformer. */ 250 const struct xfrm_type *type; 251 struct xfrm_mode inner_mode; 252 struct xfrm_mode inner_mode_iaf; 253 struct xfrm_mode outer_mode; 254 255 const struct xfrm_type_offload *type_offload; 256 257 /* Security context */ 258 struct xfrm_sec_ctx *security; 259 260 /* Private data of this transformer, format is opaque, 261 * interpreted by xfrm_type methods. */ 262 void *data; 263 }; 264 265 static inline struct net *xs_net(struct xfrm_state *x) 266 { 267 return read_pnet(&x->xs_net); 268 } 269 270 /* xflags - make enum if more show up */ 271 #define XFRM_TIME_DEFER 1 272 #define XFRM_SOFT_EXPIRE 2 273 274 enum { 275 XFRM_STATE_VOID, 276 XFRM_STATE_ACQ, 277 XFRM_STATE_VALID, 278 XFRM_STATE_ERROR, 279 XFRM_STATE_EXPIRED, 280 XFRM_STATE_DEAD 281 }; 282 283 /* callback structure passed from either netlink or pfkey */ 284 struct km_event { 285 union { 286 u32 hard; 287 u32 proto; 288 u32 byid; 289 u32 aevent; 290 u32 type; 291 } data; 292 293 u32 seq; 294 u32 portid; 295 u32 event; 296 struct net *net; 297 }; 298 299 struct xfrm_replay { 300 void (*advance)(struct xfrm_state *x, __be32 net_seq); 301 int (*check)(struct xfrm_state *x, 302 struct sk_buff *skb, 303 __be32 net_seq); 304 int (*recheck)(struct xfrm_state *x, 305 struct sk_buff *skb, 306 __be32 net_seq); 307 void (*notify)(struct xfrm_state *x, int event); 308 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb); 309 }; 310 311 struct xfrm_if_cb { 312 struct xfrm_if *(*decode_session)(struct sk_buff *skb, 313 unsigned short family); 314 }; 315 316 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb); 317 void xfrm_if_unregister_cb(void); 318 319 struct net_device; 320 struct xfrm_type; 321 struct xfrm_dst; 322 struct xfrm_policy_afinfo { 323 struct dst_ops *dst_ops; 324 struct dst_entry *(*dst_lookup)(struct net *net, 325 int tos, int oif, 326 const xfrm_address_t *saddr, 327 const xfrm_address_t *daddr, 328 u32 mark); 329 int (*get_saddr)(struct net *net, int oif, 330 xfrm_address_t *saddr, 331 xfrm_address_t *daddr, 332 u32 mark); 333 int (*fill_dst)(struct xfrm_dst *xdst, 334 struct net_device *dev, 335 const struct flowi *fl); 336 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig); 337 }; 338 339 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family); 340 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo); 341 void km_policy_notify(struct xfrm_policy *xp, int dir, 342 const struct km_event *c); 343 void km_state_notify(struct xfrm_state *x, const struct km_event *c); 344 345 struct xfrm_tmpl; 346 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, 347 struct xfrm_policy *pol); 348 void km_state_expired(struct xfrm_state *x, int hard, u32 portid); 349 int __xfrm_state_delete(struct xfrm_state *x); 350 351 struct xfrm_state_afinfo { 352 u8 family; 353 u8 proto; 354 355 const struct xfrm_type_offload *type_offload_esp; 356 357 const struct xfrm_type *type_esp; 358 const struct xfrm_type *type_ipip; 359 const struct xfrm_type *type_ipip6; 360 const struct xfrm_type *type_comp; 361 const struct xfrm_type *type_ah; 362 const struct xfrm_type *type_routing; 363 const struct xfrm_type *type_dstopts; 364 365 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb); 366 int (*transport_finish)(struct sk_buff *skb, 367 int async); 368 void (*local_error)(struct sk_buff *skb, u32 mtu); 369 }; 370 371 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 372 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 373 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); 374 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family); 375 376 struct xfrm_input_afinfo { 377 u8 family; 378 bool is_ipip; 379 int (*callback)(struct sk_buff *skb, u8 protocol, 380 int err); 381 }; 382 383 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo); 384 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo); 385 386 void xfrm_flush_gc(void); 387 void xfrm_state_delete_tunnel(struct xfrm_state *x); 388 389 struct xfrm_type { 390 char *description; 391 struct module *owner; 392 u8 proto; 393 u8 flags; 394 #define XFRM_TYPE_NON_FRAGMENT 1 395 #define XFRM_TYPE_REPLAY_PROT 2 396 #define XFRM_TYPE_LOCAL_COADDR 4 397 #define XFRM_TYPE_REMOTE_COADDR 8 398 399 int (*init_state)(struct xfrm_state *x); 400 void (*destructor)(struct xfrm_state *); 401 int (*input)(struct xfrm_state *, struct sk_buff *skb); 402 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 403 int (*reject)(struct xfrm_state *, struct sk_buff *, 404 const struct flowi *); 405 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **); 406 }; 407 408 int xfrm_register_type(const struct xfrm_type *type, unsigned short family); 409 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); 410 411 struct xfrm_type_offload { 412 char *description; 413 struct module *owner; 414 u8 proto; 415 void (*encap)(struct xfrm_state *, struct sk_buff *pskb); 416 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb); 417 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features); 418 }; 419 420 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family); 421 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family); 422 423 static inline int xfrm_af2proto(unsigned int family) 424 { 425 switch(family) { 426 case AF_INET: 427 return IPPROTO_IPIP; 428 case AF_INET6: 429 return IPPROTO_IPV6; 430 default: 431 return 0; 432 } 433 } 434 435 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto) 436 { 437 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) || 438 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6)) 439 return &x->inner_mode; 440 else 441 return &x->inner_mode_iaf; 442 } 443 444 struct xfrm_tmpl { 445 /* id in template is interpreted as: 446 * daddr - destination of tunnel, may be zero for transport mode. 447 * spi - zero to acquire spi. Not zero if spi is static, then 448 * daddr must be fixed too. 449 * proto - AH/ESP/IPCOMP 450 */ 451 struct xfrm_id id; 452 453 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 454 xfrm_address_t saddr; 455 456 unsigned short encap_family; 457 458 u32 reqid; 459 460 /* Mode: transport, tunnel etc. */ 461 u8 mode; 462 463 /* Sharing mode: unique, this session only, this user only etc. */ 464 u8 share; 465 466 /* May skip this transfomration if no SA is found */ 467 u8 optional; 468 469 /* Skip aalgos/ealgos/calgos checks. */ 470 u8 allalgs; 471 472 /* Bit mask of algos allowed for acquisition */ 473 u32 aalgos; 474 u32 ealgos; 475 u32 calgos; 476 }; 477 478 #define XFRM_MAX_DEPTH 6 479 #define XFRM_MAX_OFFLOAD_DEPTH 1 480 481 struct xfrm_policy_walk_entry { 482 struct list_head all; 483 u8 dead; 484 }; 485 486 struct xfrm_policy_walk { 487 struct xfrm_policy_walk_entry walk; 488 u8 type; 489 u32 seq; 490 }; 491 492 struct xfrm_policy_queue { 493 struct sk_buff_head hold_queue; 494 struct timer_list hold_timer; 495 unsigned long timeout; 496 }; 497 498 struct xfrm_policy { 499 possible_net_t xp_net; 500 struct hlist_node bydst; 501 struct hlist_node byidx; 502 503 /* This lock only affects elements except for entry. */ 504 rwlock_t lock; 505 refcount_t refcnt; 506 u32 pos; 507 struct timer_list timer; 508 509 atomic_t genid; 510 u32 priority; 511 u32 index; 512 u32 if_id; 513 struct xfrm_mark mark; 514 struct xfrm_selector selector; 515 struct xfrm_lifetime_cfg lft; 516 struct xfrm_lifetime_cur curlft; 517 struct xfrm_policy_walk_entry walk; 518 struct xfrm_policy_queue polq; 519 bool bydst_reinsert; 520 u8 type; 521 u8 action; 522 u8 flags; 523 u8 xfrm_nr; 524 u16 family; 525 struct xfrm_sec_ctx *security; 526 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 527 struct hlist_node bydst_inexact_list; 528 struct rcu_head rcu; 529 }; 530 531 static inline struct net *xp_net(const struct xfrm_policy *xp) 532 { 533 return read_pnet(&xp->xp_net); 534 } 535 536 struct xfrm_kmaddress { 537 xfrm_address_t local; 538 xfrm_address_t remote; 539 u32 reserved; 540 u16 family; 541 }; 542 543 struct xfrm_migrate { 544 xfrm_address_t old_daddr; 545 xfrm_address_t old_saddr; 546 xfrm_address_t new_daddr; 547 xfrm_address_t new_saddr; 548 u8 proto; 549 u8 mode; 550 u16 reserved; 551 u32 reqid; 552 u16 old_family; 553 u16 new_family; 554 }; 555 556 #define XFRM_KM_TIMEOUT 30 557 /* what happened */ 558 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 559 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 560 561 /* default aevent timeout in units of 100ms */ 562 #define XFRM_AE_ETIME 10 563 /* Async Event timer multiplier */ 564 #define XFRM_AE_ETH_M 10 565 /* default seq threshold size */ 566 #define XFRM_AE_SEQT_SIZE 2 567 568 struct xfrm_mgr { 569 struct list_head list; 570 int (*notify)(struct xfrm_state *x, const struct km_event *c); 571 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp); 572 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 573 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 574 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c); 575 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 576 int (*migrate)(const struct xfrm_selector *sel, 577 u8 dir, u8 type, 578 const struct xfrm_migrate *m, 579 int num_bundles, 580 const struct xfrm_kmaddress *k, 581 const struct xfrm_encap_tmpl *encap); 582 bool (*is_alive)(const struct km_event *c); 583 }; 584 585 int xfrm_register_km(struct xfrm_mgr *km); 586 int xfrm_unregister_km(struct xfrm_mgr *km); 587 588 struct xfrm_tunnel_skb_cb { 589 union { 590 struct inet_skb_parm h4; 591 struct inet6_skb_parm h6; 592 } header; 593 594 union { 595 struct ip_tunnel *ip4; 596 struct ip6_tnl *ip6; 597 } tunnel; 598 }; 599 600 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0])) 601 602 /* 603 * This structure is used for the duration where packets are being 604 * transformed by IPsec. As soon as the packet leaves IPsec the 605 * area beyond the generic IP part may be overwritten. 606 */ 607 struct xfrm_skb_cb { 608 struct xfrm_tunnel_skb_cb header; 609 610 /* Sequence number for replay protection. */ 611 union { 612 struct { 613 __u32 low; 614 __u32 hi; 615 } output; 616 struct { 617 __be32 low; 618 __be32 hi; 619 } input; 620 } seq; 621 }; 622 623 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) 624 625 /* 626 * This structure is used by the afinfo prepare_input/prepare_output functions 627 * to transmit header information to the mode input/output functions. 628 */ 629 struct xfrm_mode_skb_cb { 630 struct xfrm_tunnel_skb_cb header; 631 632 /* Copied from header for IPv4, always set to zero and DF for IPv6. */ 633 __be16 id; 634 __be16 frag_off; 635 636 /* IP header length (excluding options or extension headers). */ 637 u8 ihl; 638 639 /* TOS for IPv4, class for IPv6. */ 640 u8 tos; 641 642 /* TTL for IPv4, hop limitfor IPv6. */ 643 u8 ttl; 644 645 /* Protocol for IPv4, NH for IPv6. */ 646 u8 protocol; 647 648 /* Option length for IPv4, zero for IPv6. */ 649 u8 optlen; 650 651 /* Used by IPv6 only, zero for IPv4. */ 652 u8 flow_lbl[3]; 653 }; 654 655 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0])) 656 657 /* 658 * This structure is used by the input processing to locate the SPI and 659 * related information. 660 */ 661 struct xfrm_spi_skb_cb { 662 struct xfrm_tunnel_skb_cb header; 663 664 unsigned int daddroff; 665 unsigned int family; 666 __be32 seq; 667 }; 668 669 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0])) 670 671 #ifdef CONFIG_AUDITSYSCALL 672 static inline struct audit_buffer *xfrm_audit_start(const char *op) 673 { 674 struct audit_buffer *audit_buf = NULL; 675 676 if (audit_enabled == AUDIT_OFF) 677 return NULL; 678 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC, 679 AUDIT_MAC_IPSEC_EVENT); 680 if (audit_buf == NULL) 681 return NULL; 682 audit_log_format(audit_buf, "op=%s", op); 683 return audit_buf; 684 } 685 686 static inline void xfrm_audit_helper_usrinfo(bool task_valid, 687 struct audit_buffer *audit_buf) 688 { 689 const unsigned int auid = from_kuid(&init_user_ns, task_valid ? 690 audit_get_loginuid(current) : 691 INVALID_UID); 692 const unsigned int ses = task_valid ? audit_get_sessionid(current) : 693 AUDIT_SID_UNSET; 694 695 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses); 696 audit_log_task_context(audit_buf); 697 } 698 699 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid); 700 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 701 bool task_valid); 702 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid); 703 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid); 704 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 705 struct sk_buff *skb); 706 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb, 707 __be32 net_seq); 708 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family); 709 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi, 710 __be32 net_seq); 711 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb, 712 u8 proto); 713 #else 714 715 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 716 bool task_valid) 717 { 718 } 719 720 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 721 bool task_valid) 722 { 723 } 724 725 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result, 726 bool task_valid) 727 { 728 } 729 730 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result, 731 bool task_valid) 732 { 733 } 734 735 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 736 struct sk_buff *skb) 737 { 738 } 739 740 static inline void xfrm_audit_state_replay(struct xfrm_state *x, 741 struct sk_buff *skb, __be32 net_seq) 742 { 743 } 744 745 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb, 746 u16 family) 747 { 748 } 749 750 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 751 __be32 net_spi, __be32 net_seq) 752 { 753 } 754 755 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x, 756 struct sk_buff *skb, u8 proto) 757 { 758 } 759 #endif /* CONFIG_AUDITSYSCALL */ 760 761 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 762 { 763 if (likely(policy != NULL)) 764 refcount_inc(&policy->refcnt); 765 } 766 767 void xfrm_policy_destroy(struct xfrm_policy *policy); 768 769 static inline void xfrm_pol_put(struct xfrm_policy *policy) 770 { 771 if (refcount_dec_and_test(&policy->refcnt)) 772 xfrm_policy_destroy(policy); 773 } 774 775 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 776 { 777 int i; 778 for (i = npols - 1; i >= 0; --i) 779 xfrm_pol_put(pols[i]); 780 } 781 782 void __xfrm_state_destroy(struct xfrm_state *, bool); 783 784 static inline void __xfrm_state_put(struct xfrm_state *x) 785 { 786 refcount_dec(&x->refcnt); 787 } 788 789 static inline void xfrm_state_put(struct xfrm_state *x) 790 { 791 if (refcount_dec_and_test(&x->refcnt)) 792 __xfrm_state_destroy(x, false); 793 } 794 795 static inline void xfrm_state_put_sync(struct xfrm_state *x) 796 { 797 if (refcount_dec_and_test(&x->refcnt)) 798 __xfrm_state_destroy(x, true); 799 } 800 801 static inline void xfrm_state_hold(struct xfrm_state *x) 802 { 803 refcount_inc(&x->refcnt); 804 } 805 806 static inline bool addr_match(const void *token1, const void *token2, 807 unsigned int prefixlen) 808 { 809 const __be32 *a1 = token1; 810 const __be32 *a2 = token2; 811 unsigned int pdw; 812 unsigned int pbi; 813 814 pdw = prefixlen >> 5; /* num of whole u32 in prefix */ 815 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 816 817 if (pdw) 818 if (memcmp(a1, a2, pdw << 2)) 819 return false; 820 821 if (pbi) { 822 __be32 mask; 823 824 mask = htonl((0xffffffff) << (32 - pbi)); 825 826 if ((a1[pdw] ^ a2[pdw]) & mask) 827 return false; 828 } 829 830 return true; 831 } 832 833 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen) 834 { 835 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */ 836 if (sizeof(long) == 4 && prefixlen == 0) 837 return true; 838 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen))); 839 } 840 841 static __inline__ 842 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli) 843 { 844 __be16 port; 845 switch(fl->flowi_proto) { 846 case IPPROTO_TCP: 847 case IPPROTO_UDP: 848 case IPPROTO_UDPLITE: 849 case IPPROTO_SCTP: 850 port = uli->ports.sport; 851 break; 852 case IPPROTO_ICMP: 853 case IPPROTO_ICMPV6: 854 port = htons(uli->icmpt.type); 855 break; 856 case IPPROTO_MH: 857 port = htons(uli->mht.type); 858 break; 859 case IPPROTO_GRE: 860 port = htons(ntohl(uli->gre_key) >> 16); 861 break; 862 default: 863 port = 0; /*XXX*/ 864 } 865 return port; 866 } 867 868 static __inline__ 869 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli) 870 { 871 __be16 port; 872 switch(fl->flowi_proto) { 873 case IPPROTO_TCP: 874 case IPPROTO_UDP: 875 case IPPROTO_UDPLITE: 876 case IPPROTO_SCTP: 877 port = uli->ports.dport; 878 break; 879 case IPPROTO_ICMP: 880 case IPPROTO_ICMPV6: 881 port = htons(uli->icmpt.code); 882 break; 883 case IPPROTO_GRE: 884 port = htons(ntohl(uli->gre_key) & 0xffff); 885 break; 886 default: 887 port = 0; /*XXX*/ 888 } 889 return port; 890 } 891 892 bool xfrm_selector_match(const struct xfrm_selector *sel, 893 const struct flowi *fl, unsigned short family); 894 895 #ifdef CONFIG_SECURITY_NETWORK_XFRM 896 /* If neither has a context --> match 897 * Otherwise, both must have a context and the sids, doi, alg must match 898 */ 899 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 900 { 901 return ((!s1 && !s2) || 902 (s1 && s2 && 903 (s1->ctx_sid == s2->ctx_sid) && 904 (s1->ctx_doi == s2->ctx_doi) && 905 (s1->ctx_alg == s2->ctx_alg))); 906 } 907 #else 908 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 909 { 910 return true; 911 } 912 #endif 913 914 /* A struct encoding bundle of transformations to apply to some set of flow. 915 * 916 * xdst->child points to the next element of bundle. 917 * dst->xfrm points to an instanse of transformer. 918 * 919 * Due to unfortunate limitations of current routing cache, which we 920 * have no time to fix, it mirrors struct rtable and bound to the same 921 * routing key, including saddr,daddr. However, we can have many of 922 * bundles differing by session id. All the bundles grow from a parent 923 * policy rule. 924 */ 925 struct xfrm_dst { 926 union { 927 struct dst_entry dst; 928 struct rtable rt; 929 struct rt6_info rt6; 930 } u; 931 struct dst_entry *route; 932 struct dst_entry *child; 933 struct dst_entry *path; 934 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; 935 int num_pols, num_xfrms; 936 u32 xfrm_genid; 937 u32 policy_genid; 938 u32 route_mtu_cached; 939 u32 child_mtu_cached; 940 u32 route_cookie; 941 u32 path_cookie; 942 }; 943 944 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst) 945 { 946 #ifdef CONFIG_XFRM 947 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) { 948 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst; 949 950 return xdst->path; 951 } 952 #endif 953 return (struct dst_entry *) dst; 954 } 955 956 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst) 957 { 958 #ifdef CONFIG_XFRM 959 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) { 960 struct xfrm_dst *xdst = (struct xfrm_dst *) dst; 961 return xdst->child; 962 } 963 #endif 964 return NULL; 965 } 966 967 #ifdef CONFIG_XFRM 968 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child) 969 { 970 xdst->child = child; 971 } 972 973 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 974 { 975 xfrm_pols_put(xdst->pols, xdst->num_pols); 976 dst_release(xdst->route); 977 if (likely(xdst->u.dst.xfrm)) 978 xfrm_state_put(xdst->u.dst.xfrm); 979 } 980 #endif 981 982 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 983 984 struct xfrm_if_parms { 985 int link; /* ifindex of underlying L2 interface */ 986 u32 if_id; /* interface identifyer */ 987 }; 988 989 struct xfrm_if { 990 struct xfrm_if __rcu *next; /* next interface in list */ 991 struct net_device *dev; /* virtual device associated with interface */ 992 struct net *net; /* netns for packet i/o */ 993 struct xfrm_if_parms p; /* interface parms */ 994 995 struct gro_cells gro_cells; 996 }; 997 998 struct xfrm_offload { 999 /* Output sequence number for replay protection on offloading. */ 1000 struct { 1001 __u32 low; 1002 __u32 hi; 1003 } seq; 1004 1005 __u32 flags; 1006 #define SA_DELETE_REQ 1 1007 #define CRYPTO_DONE 2 1008 #define CRYPTO_NEXT_DONE 4 1009 #define CRYPTO_FALLBACK 8 1010 #define XFRM_GSO_SEGMENT 16 1011 #define XFRM_GRO 32 1012 #define XFRM_ESP_NO_TRAILER 64 1013 #define XFRM_DEV_RESUME 128 1014 #define XFRM_XMIT 256 1015 1016 __u32 status; 1017 #define CRYPTO_SUCCESS 1 1018 #define CRYPTO_GENERIC_ERROR 2 1019 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4 1020 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8 1021 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16 1022 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32 1023 #define CRYPTO_INVALID_PACKET_SYNTAX 64 1024 #define CRYPTO_INVALID_PROTOCOL 128 1025 1026 __u8 proto; 1027 }; 1028 1029 struct sec_path { 1030 int len; 1031 int olen; 1032 1033 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 1034 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH]; 1035 }; 1036 1037 struct sec_path *secpath_set(struct sk_buff *skb); 1038 1039 static inline void 1040 secpath_reset(struct sk_buff *skb) 1041 { 1042 #ifdef CONFIG_XFRM 1043 skb_ext_del(skb, SKB_EXT_SEC_PATH); 1044 #endif 1045 } 1046 1047 static inline int 1048 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family) 1049 { 1050 switch (family) { 1051 case AF_INET: 1052 return addr->a4 == 0; 1053 case AF_INET6: 1054 return ipv6_addr_any(&addr->in6); 1055 } 1056 return 0; 1057 } 1058 1059 static inline int 1060 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1061 { 1062 return (tmpl->saddr.a4 && 1063 tmpl->saddr.a4 != x->props.saddr.a4); 1064 } 1065 1066 static inline int 1067 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1068 { 1069 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 1070 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 1071 } 1072 1073 static inline int 1074 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family) 1075 { 1076 switch (family) { 1077 case AF_INET: 1078 return __xfrm4_state_addr_cmp(tmpl, x); 1079 case AF_INET6: 1080 return __xfrm6_state_addr_cmp(tmpl, x); 1081 } 1082 return !0; 1083 } 1084 1085 #ifdef CONFIG_XFRM 1086 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, 1087 unsigned short family); 1088 1089 static inline int __xfrm_policy_check2(struct sock *sk, int dir, 1090 struct sk_buff *skb, 1091 unsigned int family, int reverse) 1092 { 1093 struct net *net = dev_net(skb->dev); 1094 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); 1095 1096 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 1097 return __xfrm_policy_check(sk, ndir, skb, family); 1098 1099 return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) || 1100 (skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY)) || 1101 __xfrm_policy_check(sk, ndir, skb, family); 1102 } 1103 1104 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1105 { 1106 return __xfrm_policy_check2(sk, dir, skb, family, 0); 1107 } 1108 1109 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1110 { 1111 return xfrm_policy_check(sk, dir, skb, AF_INET); 1112 } 1113 1114 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1115 { 1116 return xfrm_policy_check(sk, dir, skb, AF_INET6); 1117 } 1118 1119 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1120 struct sk_buff *skb) 1121 { 1122 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); 1123 } 1124 1125 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1126 struct sk_buff *skb) 1127 { 1128 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); 1129 } 1130 1131 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1132 unsigned int family, int reverse); 1133 1134 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1135 unsigned int family) 1136 { 1137 return __xfrm_decode_session(skb, fl, family, 0); 1138 } 1139 1140 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1141 struct flowi *fl, 1142 unsigned int family) 1143 { 1144 return __xfrm_decode_session(skb, fl, family, 1); 1145 } 1146 1147 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 1148 1149 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 1150 { 1151 struct net *net = dev_net(skb->dev); 1152 1153 return !net->xfrm.policy_count[XFRM_POLICY_OUT] || 1154 (skb_dst(skb)->flags & DST_NOXFRM) || 1155 __xfrm_route_forward(skb, family); 1156 } 1157 1158 static inline int xfrm4_route_forward(struct sk_buff *skb) 1159 { 1160 return xfrm_route_forward(skb, AF_INET); 1161 } 1162 1163 static inline int xfrm6_route_forward(struct sk_buff *skb) 1164 { 1165 return xfrm_route_forward(skb, AF_INET6); 1166 } 1167 1168 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk); 1169 1170 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) 1171 { 1172 sk->sk_policy[0] = NULL; 1173 sk->sk_policy[1] = NULL; 1174 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1])) 1175 return __xfrm_sk_clone_policy(sk, osk); 1176 return 0; 1177 } 1178 1179 int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 1180 1181 static inline void xfrm_sk_free_policy(struct sock *sk) 1182 { 1183 struct xfrm_policy *pol; 1184 1185 pol = rcu_dereference_protected(sk->sk_policy[0], 1); 1186 if (unlikely(pol != NULL)) { 1187 xfrm_policy_delete(pol, XFRM_POLICY_MAX); 1188 sk->sk_policy[0] = NULL; 1189 } 1190 pol = rcu_dereference_protected(sk->sk_policy[1], 1); 1191 if (unlikely(pol != NULL)) { 1192 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1); 1193 sk->sk_policy[1] = NULL; 1194 } 1195 } 1196 1197 #else 1198 1199 static inline void xfrm_sk_free_policy(struct sock *sk) {} 1200 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; } 1201 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 1202 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 1203 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1204 { 1205 return 1; 1206 } 1207 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1208 { 1209 return 1; 1210 } 1211 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1212 { 1213 return 1; 1214 } 1215 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1216 struct flowi *fl, 1217 unsigned int family) 1218 { 1219 return -ENOSYS; 1220 } 1221 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1222 struct sk_buff *skb) 1223 { 1224 return 1; 1225 } 1226 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1227 struct sk_buff *skb) 1228 { 1229 return 1; 1230 } 1231 #endif 1232 1233 static __inline__ 1234 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family) 1235 { 1236 switch (family){ 1237 case AF_INET: 1238 return (xfrm_address_t *)&fl->u.ip4.daddr; 1239 case AF_INET6: 1240 return (xfrm_address_t *)&fl->u.ip6.daddr; 1241 } 1242 return NULL; 1243 } 1244 1245 static __inline__ 1246 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family) 1247 { 1248 switch (family){ 1249 case AF_INET: 1250 return (xfrm_address_t *)&fl->u.ip4.saddr; 1251 case AF_INET6: 1252 return (xfrm_address_t *)&fl->u.ip6.saddr; 1253 } 1254 return NULL; 1255 } 1256 1257 static __inline__ 1258 void xfrm_flowi_addr_get(const struct flowi *fl, 1259 xfrm_address_t *saddr, xfrm_address_t *daddr, 1260 unsigned short family) 1261 { 1262 switch(family) { 1263 case AF_INET: 1264 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4)); 1265 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4)); 1266 break; 1267 case AF_INET6: 1268 saddr->in6 = fl->u.ip6.saddr; 1269 daddr->in6 = fl->u.ip6.daddr; 1270 break; 1271 } 1272 } 1273 1274 static __inline__ int 1275 __xfrm4_state_addr_check(const struct xfrm_state *x, 1276 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1277 { 1278 if (daddr->a4 == x->id.daddr.a4 && 1279 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 1280 return 1; 1281 return 0; 1282 } 1283 1284 static __inline__ int 1285 __xfrm6_state_addr_check(const struct xfrm_state *x, 1286 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1287 { 1288 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 1289 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) || 1290 ipv6_addr_any((struct in6_addr *)saddr) || 1291 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 1292 return 1; 1293 return 0; 1294 } 1295 1296 static __inline__ int 1297 xfrm_state_addr_check(const struct xfrm_state *x, 1298 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1299 unsigned short family) 1300 { 1301 switch (family) { 1302 case AF_INET: 1303 return __xfrm4_state_addr_check(x, daddr, saddr); 1304 case AF_INET6: 1305 return __xfrm6_state_addr_check(x, daddr, saddr); 1306 } 1307 return 0; 1308 } 1309 1310 static __inline__ int 1311 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl, 1312 unsigned short family) 1313 { 1314 switch (family) { 1315 case AF_INET: 1316 return __xfrm4_state_addr_check(x, 1317 (const xfrm_address_t *)&fl->u.ip4.daddr, 1318 (const xfrm_address_t *)&fl->u.ip4.saddr); 1319 case AF_INET6: 1320 return __xfrm6_state_addr_check(x, 1321 (const xfrm_address_t *)&fl->u.ip6.daddr, 1322 (const xfrm_address_t *)&fl->u.ip6.saddr); 1323 } 1324 return 0; 1325 } 1326 1327 static inline int xfrm_state_kern(const struct xfrm_state *x) 1328 { 1329 return atomic_read(&x->tunnel_users); 1330 } 1331 1332 static inline bool xfrm_id_proto_valid(u8 proto) 1333 { 1334 switch (proto) { 1335 case IPPROTO_AH: 1336 case IPPROTO_ESP: 1337 case IPPROTO_COMP: 1338 #if IS_ENABLED(CONFIG_IPV6) 1339 case IPPROTO_ROUTING: 1340 case IPPROTO_DSTOPTS: 1341 #endif 1342 return true; 1343 default: 1344 return false; 1345 } 1346 } 1347 1348 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */ 1349 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 1350 { 1351 return (!userproto || proto == userproto || 1352 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 1353 proto == IPPROTO_ESP || 1354 proto == IPPROTO_COMP))); 1355 } 1356 1357 /* 1358 * xfrm algorithm information 1359 */ 1360 struct xfrm_algo_aead_info { 1361 char *geniv; 1362 u16 icv_truncbits; 1363 }; 1364 1365 struct xfrm_algo_auth_info { 1366 u16 icv_truncbits; 1367 u16 icv_fullbits; 1368 }; 1369 1370 struct xfrm_algo_encr_info { 1371 char *geniv; 1372 u16 blockbits; 1373 u16 defkeybits; 1374 }; 1375 1376 struct xfrm_algo_comp_info { 1377 u16 threshold; 1378 }; 1379 1380 struct xfrm_algo_desc { 1381 char *name; 1382 char *compat; 1383 u8 available:1; 1384 u8 pfkey_supported:1; 1385 union { 1386 struct xfrm_algo_aead_info aead; 1387 struct xfrm_algo_auth_info auth; 1388 struct xfrm_algo_encr_info encr; 1389 struct xfrm_algo_comp_info comp; 1390 } uinfo; 1391 struct sadb_alg desc; 1392 }; 1393 1394 /* XFRM protocol handlers. */ 1395 struct xfrm4_protocol { 1396 int (*handler)(struct sk_buff *skb); 1397 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1398 int encap_type); 1399 int (*cb_handler)(struct sk_buff *skb, int err); 1400 int (*err_handler)(struct sk_buff *skb, u32 info); 1401 1402 struct xfrm4_protocol __rcu *next; 1403 int priority; 1404 }; 1405 1406 struct xfrm6_protocol { 1407 int (*handler)(struct sk_buff *skb); 1408 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1409 int encap_type); 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 (*cb_handler)(struct sk_buff *skb, int err); 1422 int (*err_handler)(struct sk_buff *skb, u32 info); 1423 1424 struct xfrm_tunnel __rcu *next; 1425 int priority; 1426 }; 1427 1428 struct xfrm6_tunnel { 1429 int (*handler)(struct sk_buff *skb); 1430 int (*cb_handler)(struct sk_buff *skb, int err); 1431 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1432 u8 type, u8 code, int offset, __be32 info); 1433 struct xfrm6_tunnel __rcu *next; 1434 int priority; 1435 }; 1436 1437 void xfrm_init(void); 1438 void xfrm4_init(void); 1439 int xfrm_state_init(struct net *net); 1440 void xfrm_state_fini(struct net *net); 1441 void xfrm4_state_init(void); 1442 void xfrm4_protocol_init(void); 1443 #ifdef CONFIG_XFRM 1444 int xfrm6_init(void); 1445 void xfrm6_fini(void); 1446 int xfrm6_state_init(void); 1447 void xfrm6_state_fini(void); 1448 int xfrm6_protocol_init(void); 1449 void xfrm6_protocol_fini(void); 1450 #else 1451 static inline int xfrm6_init(void) 1452 { 1453 return 0; 1454 } 1455 static inline void xfrm6_fini(void) 1456 { 1457 ; 1458 } 1459 #endif 1460 1461 #ifdef CONFIG_XFRM_STATISTICS 1462 int xfrm_proc_init(struct net *net); 1463 void xfrm_proc_fini(struct net *net); 1464 #endif 1465 1466 int xfrm_sysctl_init(struct net *net); 1467 #ifdef CONFIG_SYSCTL 1468 void xfrm_sysctl_fini(struct net *net); 1469 #else 1470 static inline void xfrm_sysctl_fini(struct net *net) 1471 { 1472 } 1473 #endif 1474 1475 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 1476 struct xfrm_address_filter *filter); 1477 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1478 int (*func)(struct xfrm_state *, int, void*), void *); 1479 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net); 1480 struct xfrm_state *xfrm_state_alloc(struct net *net); 1481 void xfrm_state_free(struct xfrm_state *x); 1482 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr, 1483 const xfrm_address_t *saddr, 1484 const struct flowi *fl, 1485 struct xfrm_tmpl *tmpl, 1486 struct xfrm_policy *pol, int *err, 1487 unsigned short family, u32 if_id); 1488 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id, 1489 xfrm_address_t *daddr, 1490 xfrm_address_t *saddr, 1491 unsigned short family, 1492 u8 mode, u8 proto, u32 reqid); 1493 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1494 unsigned short family); 1495 int xfrm_state_check_expire(struct xfrm_state *x); 1496 void xfrm_state_insert(struct xfrm_state *x); 1497 int xfrm_state_add(struct xfrm_state *x); 1498 int xfrm_state_update(struct xfrm_state *x); 1499 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark, 1500 const xfrm_address_t *daddr, __be32 spi, 1501 u8 proto, unsigned short family); 1502 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1503 const xfrm_address_t *daddr, 1504 const xfrm_address_t *saddr, 1505 u8 proto, 1506 unsigned short family); 1507 #ifdef CONFIG_XFRM_SUB_POLICY 1508 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1509 unsigned short family); 1510 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1511 unsigned short family); 1512 #else 1513 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s, 1514 int n, unsigned short family) 1515 { 1516 } 1517 1518 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s, 1519 int n, unsigned short family) 1520 { 1521 } 1522 #endif 1523 1524 struct xfrmk_sadinfo { 1525 u32 sadhcnt; /* current hash bkts */ 1526 u32 sadhmcnt; /* max allowed hash bkts */ 1527 u32 sadcnt; /* current running count */ 1528 }; 1529 1530 struct xfrmk_spdinfo { 1531 u32 incnt; 1532 u32 outcnt; 1533 u32 fwdcnt; 1534 u32 inscnt; 1535 u32 outscnt; 1536 u32 fwdscnt; 1537 u32 spdhcnt; 1538 u32 spdhmcnt; 1539 }; 1540 1541 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1542 int xfrm_state_delete(struct xfrm_state *x); 1543 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync); 1544 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid); 1545 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); 1546 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); 1547 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq); 1548 int xfrm_init_replay(struct xfrm_state *x); 1549 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu); 1550 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload); 1551 int xfrm_init_state(struct xfrm_state *x); 1552 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type); 1553 int xfrm_input_resume(struct sk_buff *skb, int nexthdr); 1554 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb, 1555 int (*finish)(struct net *, struct sock *, 1556 struct sk_buff *)); 1557 int xfrm_trans_queue(struct sk_buff *skb, 1558 int (*finish)(struct net *, struct sock *, 1559 struct sk_buff *)); 1560 int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err); 1561 int xfrm_output(struct sock *sk, struct sk_buff *skb); 1562 1563 #if IS_ENABLED(CONFIG_NET_PKTGEN) 1564 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb); 1565 #endif 1566 1567 void xfrm_local_error(struct sk_buff *skb, int mtu); 1568 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1569 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1570 int encap_type); 1571 int xfrm4_transport_finish(struct sk_buff *skb, int async); 1572 int xfrm4_rcv(struct sk_buff *skb); 1573 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1574 1575 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1576 { 1577 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL; 1578 XFRM_SPI_SKB_CB(skb)->family = AF_INET; 1579 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); 1580 return xfrm_input(skb, nexthdr, spi, 0); 1581 } 1582 1583 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1584 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb); 1585 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol); 1586 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol); 1587 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1588 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1589 void xfrm4_local_error(struct sk_buff *skb, u32 mtu); 1590 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1591 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi, 1592 struct ip6_tnl *t); 1593 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1594 int encap_type); 1595 int xfrm6_transport_finish(struct sk_buff *skb, int async); 1596 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t); 1597 int xfrm6_rcv(struct sk_buff *skb); 1598 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1599 xfrm_address_t *saddr, u8 proto); 1600 void xfrm6_local_error(struct sk_buff *skb, u32 mtu); 1601 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol); 1602 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol); 1603 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1604 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1605 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr); 1606 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr); 1607 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1608 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb); 1609 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, 1610 u8 **prevhdr); 1611 1612 #ifdef CONFIG_XFRM 1613 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu); 1614 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1615 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1616 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, 1617 int optlen); 1618 #else 1619 static inline int xfrm_user_policy(struct sock *sk, int optname, 1620 sockptr_t optval, int optlen) 1621 { 1622 return -ENOPROTOOPT; 1623 } 1624 #endif 1625 1626 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif, 1627 const xfrm_address_t *saddr, 1628 const xfrm_address_t *daddr, 1629 int family, u32 mark); 1630 1631 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); 1632 1633 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); 1634 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, 1635 int (*func)(struct xfrm_policy *, int, int, void*), 1636 void *); 1637 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net); 1638 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1639 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, 1640 const struct xfrm_mark *mark, 1641 u32 if_id, 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, 1646 const struct xfrm_mark *mark, u32 if_id, 1647 u8 type, int dir, u32 id, int delete, 1648 int *err); 1649 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid); 1650 void xfrm_policy_hash_rebuild(struct net *net); 1651 u32 xfrm_get_acqseq(void); 1652 int verify_spi_info(u8 proto, u32 min, u32 max); 1653 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 1654 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, 1655 u8 mode, u32 reqid, u32 if_id, u8 proto, 1656 const xfrm_address_t *daddr, 1657 const xfrm_address_t *saddr, int create, 1658 unsigned short family); 1659 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1660 1661 #ifdef CONFIG_XFRM_MIGRATE 1662 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1663 const struct xfrm_migrate *m, int num_bundles, 1664 const struct xfrm_kmaddress *k, 1665 const struct xfrm_encap_tmpl *encap); 1666 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net); 1667 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 1668 struct xfrm_migrate *m, 1669 struct xfrm_encap_tmpl *encap); 1670 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1671 struct xfrm_migrate *m, int num_bundles, 1672 struct xfrm_kmaddress *k, struct net *net, 1673 struct xfrm_encap_tmpl *encap); 1674 #endif 1675 1676 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1677 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid); 1678 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, 1679 xfrm_address_t *addr); 1680 1681 void xfrm_input_init(void); 1682 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1683 1684 void xfrm_probe_algs(void); 1685 int xfrm_count_pfkey_auth_supported(void); 1686 int xfrm_count_pfkey_enc_supported(void); 1687 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1688 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1689 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1690 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1691 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1692 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe); 1693 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe); 1694 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe); 1695 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, 1696 int probe); 1697 1698 static inline bool xfrm6_addr_equal(const xfrm_address_t *a, 1699 const xfrm_address_t *b) 1700 { 1701 return ipv6_addr_equal((const struct in6_addr *)a, 1702 (const struct in6_addr *)b); 1703 } 1704 1705 static inline bool xfrm_addr_equal(const xfrm_address_t *a, 1706 const xfrm_address_t *b, 1707 sa_family_t family) 1708 { 1709 switch (family) { 1710 default: 1711 case AF_INET: 1712 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0; 1713 case AF_INET6: 1714 return xfrm6_addr_equal(a, b); 1715 } 1716 } 1717 1718 static inline int xfrm_policy_id2dir(u32 index) 1719 { 1720 return index & 7; 1721 } 1722 1723 #ifdef CONFIG_XFRM 1724 static inline int xfrm_aevent_is_on(struct net *net) 1725 { 1726 struct sock *nlsk; 1727 int ret = 0; 1728 1729 rcu_read_lock(); 1730 nlsk = rcu_dereference(net->xfrm.nlsk); 1731 if (nlsk) 1732 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1733 rcu_read_unlock(); 1734 return ret; 1735 } 1736 1737 static inline int xfrm_acquire_is_on(struct net *net) 1738 { 1739 struct sock *nlsk; 1740 int ret = 0; 1741 1742 rcu_read_lock(); 1743 nlsk = rcu_dereference(net->xfrm.nlsk); 1744 if (nlsk) 1745 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE); 1746 rcu_read_unlock(); 1747 1748 return ret; 1749 } 1750 #endif 1751 1752 static inline unsigned int aead_len(struct xfrm_algo_aead *alg) 1753 { 1754 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1755 } 1756 1757 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg) 1758 { 1759 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1760 } 1761 1762 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg) 1763 { 1764 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1765 } 1766 1767 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn) 1768 { 1769 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32); 1770 } 1771 1772 #ifdef CONFIG_XFRM_MIGRATE 1773 static inline int xfrm_replay_clone(struct xfrm_state *x, 1774 struct xfrm_state *orig) 1775 { 1776 1777 x->replay_esn = kmemdup(orig->replay_esn, 1778 xfrm_replay_state_esn_len(orig->replay_esn), 1779 GFP_KERNEL); 1780 if (!x->replay_esn) 1781 return -ENOMEM; 1782 x->preplay_esn = kmemdup(orig->preplay_esn, 1783 xfrm_replay_state_esn_len(orig->preplay_esn), 1784 GFP_KERNEL); 1785 if (!x->preplay_esn) 1786 return -ENOMEM; 1787 1788 return 0; 1789 } 1790 1791 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig) 1792 { 1793 return kmemdup(orig, aead_len(orig), GFP_KERNEL); 1794 } 1795 1796 1797 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1798 { 1799 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); 1800 } 1801 1802 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig) 1803 { 1804 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL); 1805 } 1806 1807 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1808 { 1809 int i; 1810 for (i = 0; i < n; i++) 1811 xfrm_state_put(*(states + i)); 1812 } 1813 1814 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1815 { 1816 int i; 1817 for (i = 0; i < n; i++) 1818 xfrm_state_delete(*(states + i)); 1819 } 1820 #endif 1821 1822 #ifdef CONFIG_XFRM 1823 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) 1824 { 1825 struct sec_path *sp = skb_sec_path(skb); 1826 1827 return sp->xvec[sp->len - 1]; 1828 } 1829 #endif 1830 1831 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb) 1832 { 1833 #ifdef CONFIG_XFRM 1834 struct sec_path *sp = skb_sec_path(skb); 1835 1836 if (!sp || !sp->olen || sp->len != sp->olen) 1837 return NULL; 1838 1839 return &sp->ovec[sp->olen - 1]; 1840 #else 1841 return NULL; 1842 #endif 1843 } 1844 1845 void __init xfrm_dev_init(void); 1846 1847 #ifdef CONFIG_XFRM_OFFLOAD 1848 void xfrm_dev_resume(struct sk_buff *skb); 1849 void xfrm_dev_backlog(struct softnet_data *sd); 1850 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again); 1851 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, 1852 struct xfrm_user_offload *xuo); 1853 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x); 1854 1855 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 1856 { 1857 struct xfrm_state_offload *xso = &x->xso; 1858 1859 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn) 1860 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x); 1861 } 1862 1863 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 1864 { 1865 struct xfrm_state *x = dst->xfrm; 1866 struct xfrm_dst *xdst; 1867 1868 if (!x || !x->type_offload) 1869 return false; 1870 1871 xdst = (struct xfrm_dst *) dst; 1872 if (!x->xso.offload_handle && !xdst->child->xfrm) 1873 return true; 1874 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) && 1875 !xdst->child->xfrm) 1876 return true; 1877 1878 return false; 1879 } 1880 1881 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 1882 { 1883 struct xfrm_state_offload *xso = &x->xso; 1884 1885 if (xso->dev) 1886 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x); 1887 } 1888 1889 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1890 { 1891 struct xfrm_state_offload *xso = &x->xso; 1892 struct net_device *dev = xso->dev; 1893 1894 if (dev && dev->xfrmdev_ops) { 1895 if (dev->xfrmdev_ops->xdo_dev_state_free) 1896 dev->xfrmdev_ops->xdo_dev_state_free(x); 1897 xso->dev = NULL; 1898 dev_put(dev); 1899 } 1900 } 1901 #else 1902 static inline void xfrm_dev_resume(struct sk_buff *skb) 1903 { 1904 } 1905 1906 static inline void xfrm_dev_backlog(struct softnet_data *sd) 1907 { 1908 } 1909 1910 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again) 1911 { 1912 return skb; 1913 } 1914 1915 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo) 1916 { 1917 return 0; 1918 } 1919 1920 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 1921 { 1922 } 1923 1924 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1925 { 1926 } 1927 1928 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) 1929 { 1930 return false; 1931 } 1932 1933 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 1934 { 1935 } 1936 1937 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 1938 { 1939 return false; 1940 } 1941 #endif 1942 1943 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) 1944 { 1945 if (attrs[XFRMA_MARK]) 1946 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark)); 1947 else 1948 m->v = m->m = 0; 1949 1950 return m->v & m->m; 1951 } 1952 1953 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m) 1954 { 1955 int ret = 0; 1956 1957 if (m->m | m->v) 1958 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); 1959 return ret; 1960 } 1961 1962 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x) 1963 { 1964 struct xfrm_mark *m = &x->props.smark; 1965 1966 return (m->v & m->m) | (mark & ~m->m); 1967 } 1968 1969 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id) 1970 { 1971 int ret = 0; 1972 1973 if (if_id) 1974 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id); 1975 return ret; 1976 } 1977 1978 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x, 1979 unsigned int family) 1980 { 1981 bool tunnel = false; 1982 1983 switch(family) { 1984 case AF_INET: 1985 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) 1986 tunnel = true; 1987 break; 1988 case AF_INET6: 1989 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) 1990 tunnel = true; 1991 break; 1992 } 1993 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL)) 1994 return -EINVAL; 1995 1996 return 0; 1997 } 1998 1999 extern const int xfrm_msg_min[XFRM_NR_MSGTYPES]; 2000 extern const struct nla_policy xfrma_policy[XFRMA_MAX+1]; 2001 2002 struct xfrm_translator { 2003 /* Allocate frag_list and put compat translation there */ 2004 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src); 2005 2006 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */ 2007 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh, 2008 int maxtype, const struct nla_policy *policy, 2009 struct netlink_ext_ack *extack); 2010 2011 /* Translate 32-bit user_policy from sockptr */ 2012 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen); 2013 2014 struct module *owner; 2015 }; 2016 2017 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT) 2018 extern int xfrm_register_translator(struct xfrm_translator *xtr); 2019 extern int xfrm_unregister_translator(struct xfrm_translator *xtr); 2020 extern struct xfrm_translator *xfrm_get_translator(void); 2021 extern void xfrm_put_translator(struct xfrm_translator *xtr); 2022 #else 2023 static inline struct xfrm_translator *xfrm_get_translator(void) 2024 { 2025 return NULL; 2026 } 2027 static inline void xfrm_put_translator(struct xfrm_translator *xtr) 2028 { 2029 } 2030 #endif 2031 2032 #if IS_ENABLED(CONFIG_IPV6) 2033 static inline bool xfrm6_local_dontfrag(const struct sock *sk) 2034 { 2035 int proto; 2036 2037 if (!sk || sk->sk_family != AF_INET6) 2038 return false; 2039 2040 proto = sk->sk_protocol; 2041 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW) 2042 return inet6_sk(sk)->dontfrag; 2043 2044 return false; 2045 } 2046 #endif 2047 #endif /* _NET_XFRM_H */ 2048