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 enum xfrm_replay_mode { 149 XFRM_REPLAY_MODE_LEGACY, 150 XFRM_REPLAY_MODE_BMP, 151 XFRM_REPLAY_MODE_ESN, 152 }; 153 154 /* Full description of state of transformer. */ 155 struct xfrm_state { 156 possible_net_t xs_net; 157 union { 158 struct hlist_node gclist; 159 struct hlist_node bydst; 160 }; 161 struct hlist_node bysrc; 162 struct hlist_node byspi; 163 struct hlist_node byseq; 164 165 refcount_t refcnt; 166 spinlock_t lock; 167 168 struct xfrm_id id; 169 struct xfrm_selector sel; 170 struct xfrm_mark mark; 171 u32 if_id; 172 u32 tfcpad; 173 174 u32 genid; 175 176 /* Key manager bits */ 177 struct xfrm_state_walk km; 178 179 /* Parameters of this state. */ 180 struct { 181 u32 reqid; 182 u8 mode; 183 u8 replay_window; 184 u8 aalgo, ealgo, calgo; 185 u8 flags; 186 u16 family; 187 xfrm_address_t saddr; 188 int header_len; 189 int trailer_len; 190 u32 extra_flags; 191 struct xfrm_mark smark; 192 } props; 193 194 struct xfrm_lifetime_cfg lft; 195 196 /* Data for transformer */ 197 struct xfrm_algo_auth *aalg; 198 struct xfrm_algo *ealg; 199 struct xfrm_algo *calg; 200 struct xfrm_algo_aead *aead; 201 const char *geniv; 202 203 /* Data for encapsulator */ 204 struct xfrm_encap_tmpl *encap; 205 struct sock __rcu *encap_sk; 206 207 /* Data for care-of address */ 208 xfrm_address_t *coaddr; 209 210 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 211 struct xfrm_state *tunnel; 212 213 /* If a tunnel, number of users + 1 */ 214 atomic_t tunnel_users; 215 216 /* State for replay detection */ 217 struct xfrm_replay_state replay; 218 struct xfrm_replay_state_esn *replay_esn; 219 220 /* Replay detection state at the time we sent the last notification */ 221 struct xfrm_replay_state preplay; 222 struct xfrm_replay_state_esn *preplay_esn; 223 224 /* replay detection mode */ 225 enum xfrm_replay_mode repl_mode; 226 /* internal flag that only holds state for delayed aevent at the 227 * moment 228 */ 229 u32 xflags; 230 231 /* Replay detection notification settings */ 232 u32 replay_maxage; 233 u32 replay_maxdiff; 234 235 /* Replay detection notification timer */ 236 struct timer_list rtimer; 237 238 /* Statistics */ 239 struct xfrm_stats stats; 240 241 struct xfrm_lifetime_cur curlft; 242 struct hrtimer mtimer; 243 244 struct xfrm_state_offload xso; 245 246 /* used to fix curlft->add_time when changing date */ 247 long saved_tmo; 248 249 /* Last used time */ 250 time64_t lastused; 251 252 struct page_frag xfrag; 253 254 /* Reference to data common to all the instances of this 255 * transformer. */ 256 const struct xfrm_type *type; 257 struct xfrm_mode inner_mode; 258 struct xfrm_mode inner_mode_iaf; 259 struct xfrm_mode outer_mode; 260 261 const struct xfrm_type_offload *type_offload; 262 263 /* Security context */ 264 struct xfrm_sec_ctx *security; 265 266 /* Private data of this transformer, format is opaque, 267 * interpreted by xfrm_type methods. */ 268 void *data; 269 }; 270 271 static inline struct net *xs_net(struct xfrm_state *x) 272 { 273 return read_pnet(&x->xs_net); 274 } 275 276 /* xflags - make enum if more show up */ 277 #define XFRM_TIME_DEFER 1 278 #define XFRM_SOFT_EXPIRE 2 279 280 enum { 281 XFRM_STATE_VOID, 282 XFRM_STATE_ACQ, 283 XFRM_STATE_VALID, 284 XFRM_STATE_ERROR, 285 XFRM_STATE_EXPIRED, 286 XFRM_STATE_DEAD 287 }; 288 289 /* callback structure passed from either netlink or pfkey */ 290 struct km_event { 291 union { 292 u32 hard; 293 u32 proto; 294 u32 byid; 295 u32 aevent; 296 u32 type; 297 } data; 298 299 u32 seq; 300 u32 portid; 301 u32 event; 302 struct net *net; 303 }; 304 305 struct xfrm_if_cb { 306 struct xfrm_if *(*decode_session)(struct sk_buff *skb, 307 unsigned short family); 308 }; 309 310 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb); 311 void xfrm_if_unregister_cb(void); 312 313 struct net_device; 314 struct xfrm_type; 315 struct xfrm_dst; 316 struct xfrm_policy_afinfo { 317 struct dst_ops *dst_ops; 318 struct dst_entry *(*dst_lookup)(struct net *net, 319 int tos, int oif, 320 const xfrm_address_t *saddr, 321 const xfrm_address_t *daddr, 322 u32 mark); 323 int (*get_saddr)(struct net *net, int oif, 324 xfrm_address_t *saddr, 325 xfrm_address_t *daddr, 326 u32 mark); 327 int (*fill_dst)(struct xfrm_dst *xdst, 328 struct net_device *dev, 329 const struct flowi *fl); 330 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig); 331 }; 332 333 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family); 334 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo); 335 void km_policy_notify(struct xfrm_policy *xp, int dir, 336 const struct km_event *c); 337 void km_state_notify(struct xfrm_state *x, const struct km_event *c); 338 339 struct xfrm_tmpl; 340 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, 341 struct xfrm_policy *pol); 342 void km_state_expired(struct xfrm_state *x, int hard, u32 portid); 343 int __xfrm_state_delete(struct xfrm_state *x); 344 345 struct xfrm_state_afinfo { 346 u8 family; 347 u8 proto; 348 349 const struct xfrm_type_offload *type_offload_esp; 350 351 const struct xfrm_type *type_esp; 352 const struct xfrm_type *type_ipip; 353 const struct xfrm_type *type_ipip6; 354 const struct xfrm_type *type_comp; 355 const struct xfrm_type *type_ah; 356 const struct xfrm_type *type_routing; 357 const struct xfrm_type *type_dstopts; 358 359 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb); 360 int (*transport_finish)(struct sk_buff *skb, 361 int async); 362 void (*local_error)(struct sk_buff *skb, u32 mtu); 363 }; 364 365 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 366 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 367 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); 368 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family); 369 370 struct xfrm_input_afinfo { 371 u8 family; 372 bool is_ipip; 373 int (*callback)(struct sk_buff *skb, u8 protocol, 374 int err); 375 }; 376 377 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo); 378 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo); 379 380 void xfrm_flush_gc(void); 381 void xfrm_state_delete_tunnel(struct xfrm_state *x); 382 383 struct xfrm_type { 384 struct module *owner; 385 u8 proto; 386 u8 flags; 387 #define XFRM_TYPE_NON_FRAGMENT 1 388 #define XFRM_TYPE_REPLAY_PROT 2 389 #define XFRM_TYPE_LOCAL_COADDR 4 390 #define XFRM_TYPE_REMOTE_COADDR 8 391 392 int (*init_state)(struct xfrm_state *x); 393 void (*destructor)(struct xfrm_state *); 394 int (*input)(struct xfrm_state *, struct sk_buff *skb); 395 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 396 int (*reject)(struct xfrm_state *, struct sk_buff *, 397 const struct flowi *); 398 }; 399 400 int xfrm_register_type(const struct xfrm_type *type, unsigned short family); 401 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); 402 403 struct xfrm_type_offload { 404 struct module *owner; 405 u8 proto; 406 void (*encap)(struct xfrm_state *, struct sk_buff *pskb); 407 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb); 408 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features); 409 }; 410 411 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family); 412 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family); 413 414 static inline int xfrm_af2proto(unsigned int family) 415 { 416 switch(family) { 417 case AF_INET: 418 return IPPROTO_IPIP; 419 case AF_INET6: 420 return IPPROTO_IPV6; 421 default: 422 return 0; 423 } 424 } 425 426 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto) 427 { 428 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) || 429 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6)) 430 return &x->inner_mode; 431 else 432 return &x->inner_mode_iaf; 433 } 434 435 struct xfrm_tmpl { 436 /* id in template is interpreted as: 437 * daddr - destination of tunnel, may be zero for transport mode. 438 * spi - zero to acquire spi. Not zero if spi is static, then 439 * daddr must be fixed too. 440 * proto - AH/ESP/IPCOMP 441 */ 442 struct xfrm_id id; 443 444 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 445 xfrm_address_t saddr; 446 447 unsigned short encap_family; 448 449 u32 reqid; 450 451 /* Mode: transport, tunnel etc. */ 452 u8 mode; 453 454 /* Sharing mode: unique, this session only, this user only etc. */ 455 u8 share; 456 457 /* May skip this transfomration if no SA is found */ 458 u8 optional; 459 460 /* Skip aalgos/ealgos/calgos checks. */ 461 u8 allalgs; 462 463 /* Bit mask of algos allowed for acquisition */ 464 u32 aalgos; 465 u32 ealgos; 466 u32 calgos; 467 }; 468 469 #define XFRM_MAX_DEPTH 6 470 #define XFRM_MAX_OFFLOAD_DEPTH 1 471 472 struct xfrm_policy_walk_entry { 473 struct list_head all; 474 u8 dead; 475 }; 476 477 struct xfrm_policy_walk { 478 struct xfrm_policy_walk_entry walk; 479 u8 type; 480 u32 seq; 481 }; 482 483 struct xfrm_policy_queue { 484 struct sk_buff_head hold_queue; 485 struct timer_list hold_timer; 486 unsigned long timeout; 487 }; 488 489 struct xfrm_policy { 490 possible_net_t xp_net; 491 struct hlist_node bydst; 492 struct hlist_node byidx; 493 494 /* This lock only affects elements except for entry. */ 495 rwlock_t lock; 496 refcount_t refcnt; 497 u32 pos; 498 struct timer_list timer; 499 500 atomic_t genid; 501 u32 priority; 502 u32 index; 503 u32 if_id; 504 struct xfrm_mark mark; 505 struct xfrm_selector selector; 506 struct xfrm_lifetime_cfg lft; 507 struct xfrm_lifetime_cur curlft; 508 struct xfrm_policy_walk_entry walk; 509 struct xfrm_policy_queue polq; 510 bool bydst_reinsert; 511 u8 type; 512 u8 action; 513 u8 flags; 514 u8 xfrm_nr; 515 u16 family; 516 struct xfrm_sec_ctx *security; 517 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 518 struct hlist_node bydst_inexact_list; 519 struct rcu_head rcu; 520 }; 521 522 static inline struct net *xp_net(const struct xfrm_policy *xp) 523 { 524 return read_pnet(&xp->xp_net); 525 } 526 527 struct xfrm_kmaddress { 528 xfrm_address_t local; 529 xfrm_address_t remote; 530 u32 reserved; 531 u16 family; 532 }; 533 534 struct xfrm_migrate { 535 xfrm_address_t old_daddr; 536 xfrm_address_t old_saddr; 537 xfrm_address_t new_daddr; 538 xfrm_address_t new_saddr; 539 u8 proto; 540 u8 mode; 541 u16 reserved; 542 u32 reqid; 543 u16 old_family; 544 u16 new_family; 545 }; 546 547 #define XFRM_KM_TIMEOUT 30 548 /* what happened */ 549 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 550 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 551 552 /* default aevent timeout in units of 100ms */ 553 #define XFRM_AE_ETIME 10 554 /* Async Event timer multiplier */ 555 #define XFRM_AE_ETH_M 10 556 /* default seq threshold size */ 557 #define XFRM_AE_SEQT_SIZE 2 558 559 struct xfrm_mgr { 560 struct list_head list; 561 int (*notify)(struct xfrm_state *x, const struct km_event *c); 562 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp); 563 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 564 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 565 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c); 566 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 567 int (*migrate)(const struct xfrm_selector *sel, 568 u8 dir, u8 type, 569 const struct xfrm_migrate *m, 570 int num_bundles, 571 const struct xfrm_kmaddress *k, 572 const struct xfrm_encap_tmpl *encap); 573 bool (*is_alive)(const struct km_event *c); 574 }; 575 576 int xfrm_register_km(struct xfrm_mgr *km); 577 int xfrm_unregister_km(struct xfrm_mgr *km); 578 579 struct xfrm_tunnel_skb_cb { 580 union { 581 struct inet_skb_parm h4; 582 struct inet6_skb_parm h6; 583 } header; 584 585 union { 586 struct ip_tunnel *ip4; 587 struct ip6_tnl *ip6; 588 } tunnel; 589 }; 590 591 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0])) 592 593 /* 594 * This structure is used for the duration where packets are being 595 * transformed by IPsec. As soon as the packet leaves IPsec the 596 * area beyond the generic IP part may be overwritten. 597 */ 598 struct xfrm_skb_cb { 599 struct xfrm_tunnel_skb_cb header; 600 601 /* Sequence number for replay protection. */ 602 union { 603 struct { 604 __u32 low; 605 __u32 hi; 606 } output; 607 struct { 608 __be32 low; 609 __be32 hi; 610 } input; 611 } seq; 612 }; 613 614 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) 615 616 /* 617 * This structure is used by the afinfo prepare_input/prepare_output functions 618 * to transmit header information to the mode input/output functions. 619 */ 620 struct xfrm_mode_skb_cb { 621 struct xfrm_tunnel_skb_cb header; 622 623 /* Copied from header for IPv4, always set to zero and DF for IPv6. */ 624 __be16 id; 625 __be16 frag_off; 626 627 /* IP header length (excluding options or extension headers). */ 628 u8 ihl; 629 630 /* TOS for IPv4, class for IPv6. */ 631 u8 tos; 632 633 /* TTL for IPv4, hop limitfor IPv6. */ 634 u8 ttl; 635 636 /* Protocol for IPv4, NH for IPv6. */ 637 u8 protocol; 638 639 /* Option length for IPv4, zero for IPv6. */ 640 u8 optlen; 641 642 /* Used by IPv6 only, zero for IPv4. */ 643 u8 flow_lbl[3]; 644 }; 645 646 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0])) 647 648 /* 649 * This structure is used by the input processing to locate the SPI and 650 * related information. 651 */ 652 struct xfrm_spi_skb_cb { 653 struct xfrm_tunnel_skb_cb header; 654 655 unsigned int daddroff; 656 unsigned int family; 657 __be32 seq; 658 }; 659 660 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0])) 661 662 #ifdef CONFIG_AUDITSYSCALL 663 static inline struct audit_buffer *xfrm_audit_start(const char *op) 664 { 665 struct audit_buffer *audit_buf = NULL; 666 667 if (audit_enabled == AUDIT_OFF) 668 return NULL; 669 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC, 670 AUDIT_MAC_IPSEC_EVENT); 671 if (audit_buf == NULL) 672 return NULL; 673 audit_log_format(audit_buf, "op=%s", op); 674 return audit_buf; 675 } 676 677 static inline void xfrm_audit_helper_usrinfo(bool task_valid, 678 struct audit_buffer *audit_buf) 679 { 680 const unsigned int auid = from_kuid(&init_user_ns, task_valid ? 681 audit_get_loginuid(current) : 682 INVALID_UID); 683 const unsigned int ses = task_valid ? audit_get_sessionid(current) : 684 AUDIT_SID_UNSET; 685 686 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses); 687 audit_log_task_context(audit_buf); 688 } 689 690 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid); 691 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 692 bool task_valid); 693 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid); 694 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid); 695 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 696 struct sk_buff *skb); 697 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb, 698 __be32 net_seq); 699 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family); 700 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi, 701 __be32 net_seq); 702 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb, 703 u8 proto); 704 #else 705 706 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 707 bool task_valid) 708 { 709 } 710 711 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 712 bool task_valid) 713 { 714 } 715 716 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result, 717 bool task_valid) 718 { 719 } 720 721 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result, 722 bool task_valid) 723 { 724 } 725 726 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 727 struct sk_buff *skb) 728 { 729 } 730 731 static inline void xfrm_audit_state_replay(struct xfrm_state *x, 732 struct sk_buff *skb, __be32 net_seq) 733 { 734 } 735 736 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb, 737 u16 family) 738 { 739 } 740 741 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 742 __be32 net_spi, __be32 net_seq) 743 { 744 } 745 746 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x, 747 struct sk_buff *skb, u8 proto) 748 { 749 } 750 #endif /* CONFIG_AUDITSYSCALL */ 751 752 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 753 { 754 if (likely(policy != NULL)) 755 refcount_inc(&policy->refcnt); 756 } 757 758 void xfrm_policy_destroy(struct xfrm_policy *policy); 759 760 static inline void xfrm_pol_put(struct xfrm_policy *policy) 761 { 762 if (refcount_dec_and_test(&policy->refcnt)) 763 xfrm_policy_destroy(policy); 764 } 765 766 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 767 { 768 int i; 769 for (i = npols - 1; i >= 0; --i) 770 xfrm_pol_put(pols[i]); 771 } 772 773 void __xfrm_state_destroy(struct xfrm_state *, bool); 774 775 static inline void __xfrm_state_put(struct xfrm_state *x) 776 { 777 refcount_dec(&x->refcnt); 778 } 779 780 static inline void xfrm_state_put(struct xfrm_state *x) 781 { 782 if (refcount_dec_and_test(&x->refcnt)) 783 __xfrm_state_destroy(x, false); 784 } 785 786 static inline void xfrm_state_put_sync(struct xfrm_state *x) 787 { 788 if (refcount_dec_and_test(&x->refcnt)) 789 __xfrm_state_destroy(x, true); 790 } 791 792 static inline void xfrm_state_hold(struct xfrm_state *x) 793 { 794 refcount_inc(&x->refcnt); 795 } 796 797 static inline bool addr_match(const void *token1, const void *token2, 798 unsigned int prefixlen) 799 { 800 const __be32 *a1 = token1; 801 const __be32 *a2 = token2; 802 unsigned int pdw; 803 unsigned int pbi; 804 805 pdw = prefixlen >> 5; /* num of whole u32 in prefix */ 806 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 807 808 if (pdw) 809 if (memcmp(a1, a2, pdw << 2)) 810 return false; 811 812 if (pbi) { 813 __be32 mask; 814 815 mask = htonl((0xffffffff) << (32 - pbi)); 816 817 if ((a1[pdw] ^ a2[pdw]) & mask) 818 return false; 819 } 820 821 return true; 822 } 823 824 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen) 825 { 826 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */ 827 if (sizeof(long) == 4 && prefixlen == 0) 828 return true; 829 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen))); 830 } 831 832 static __inline__ 833 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli) 834 { 835 __be16 port; 836 switch(fl->flowi_proto) { 837 case IPPROTO_TCP: 838 case IPPROTO_UDP: 839 case IPPROTO_UDPLITE: 840 case IPPROTO_SCTP: 841 port = uli->ports.sport; 842 break; 843 case IPPROTO_ICMP: 844 case IPPROTO_ICMPV6: 845 port = htons(uli->icmpt.type); 846 break; 847 case IPPROTO_MH: 848 port = htons(uli->mht.type); 849 break; 850 case IPPROTO_GRE: 851 port = htons(ntohl(uli->gre_key) >> 16); 852 break; 853 default: 854 port = 0; /*XXX*/ 855 } 856 return port; 857 } 858 859 static __inline__ 860 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli) 861 { 862 __be16 port; 863 switch(fl->flowi_proto) { 864 case IPPROTO_TCP: 865 case IPPROTO_UDP: 866 case IPPROTO_UDPLITE: 867 case IPPROTO_SCTP: 868 port = uli->ports.dport; 869 break; 870 case IPPROTO_ICMP: 871 case IPPROTO_ICMPV6: 872 port = htons(uli->icmpt.code); 873 break; 874 case IPPROTO_GRE: 875 port = htons(ntohl(uli->gre_key) & 0xffff); 876 break; 877 default: 878 port = 0; /*XXX*/ 879 } 880 return port; 881 } 882 883 bool xfrm_selector_match(const struct xfrm_selector *sel, 884 const struct flowi *fl, unsigned short family); 885 886 #ifdef CONFIG_SECURITY_NETWORK_XFRM 887 /* If neither has a context --> match 888 * Otherwise, both must have a context and the sids, doi, alg must match 889 */ 890 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 891 { 892 return ((!s1 && !s2) || 893 (s1 && s2 && 894 (s1->ctx_sid == s2->ctx_sid) && 895 (s1->ctx_doi == s2->ctx_doi) && 896 (s1->ctx_alg == s2->ctx_alg))); 897 } 898 #else 899 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 900 { 901 return true; 902 } 903 #endif 904 905 /* A struct encoding bundle of transformations to apply to some set of flow. 906 * 907 * xdst->child points to the next element of bundle. 908 * dst->xfrm points to an instanse of transformer. 909 * 910 * Due to unfortunate limitations of current routing cache, which we 911 * have no time to fix, it mirrors struct rtable and bound to the same 912 * routing key, including saddr,daddr. However, we can have many of 913 * bundles differing by session id. All the bundles grow from a parent 914 * policy rule. 915 */ 916 struct xfrm_dst { 917 union { 918 struct dst_entry dst; 919 struct rtable rt; 920 struct rt6_info rt6; 921 } u; 922 struct dst_entry *route; 923 struct dst_entry *child; 924 struct dst_entry *path; 925 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; 926 int num_pols, num_xfrms; 927 u32 xfrm_genid; 928 u32 policy_genid; 929 u32 route_mtu_cached; 930 u32 child_mtu_cached; 931 u32 route_cookie; 932 u32 path_cookie; 933 }; 934 935 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst) 936 { 937 #ifdef CONFIG_XFRM 938 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) { 939 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst; 940 941 return xdst->path; 942 } 943 #endif 944 return (struct dst_entry *) dst; 945 } 946 947 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst) 948 { 949 #ifdef CONFIG_XFRM 950 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) { 951 struct xfrm_dst *xdst = (struct xfrm_dst *) dst; 952 return xdst->child; 953 } 954 #endif 955 return NULL; 956 } 957 958 #ifdef CONFIG_XFRM 959 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child) 960 { 961 xdst->child = child; 962 } 963 964 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 965 { 966 xfrm_pols_put(xdst->pols, xdst->num_pols); 967 dst_release(xdst->route); 968 if (likely(xdst->u.dst.xfrm)) 969 xfrm_state_put(xdst->u.dst.xfrm); 970 } 971 #endif 972 973 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 974 975 struct xfrm_if_parms { 976 int link; /* ifindex of underlying L2 interface */ 977 u32 if_id; /* interface identifyer */ 978 }; 979 980 struct xfrm_if { 981 struct xfrm_if __rcu *next; /* next interface in list */ 982 struct net_device *dev; /* virtual device associated with interface */ 983 struct net *net; /* netns for packet i/o */ 984 struct xfrm_if_parms p; /* interface parms */ 985 986 struct gro_cells gro_cells; 987 }; 988 989 struct xfrm_offload { 990 /* Output sequence number for replay protection on offloading. */ 991 struct { 992 __u32 low; 993 __u32 hi; 994 } seq; 995 996 __u32 flags; 997 #define SA_DELETE_REQ 1 998 #define CRYPTO_DONE 2 999 #define CRYPTO_NEXT_DONE 4 1000 #define CRYPTO_FALLBACK 8 1001 #define XFRM_GSO_SEGMENT 16 1002 #define XFRM_GRO 32 1003 #define XFRM_ESP_NO_TRAILER 64 1004 #define XFRM_DEV_RESUME 128 1005 #define XFRM_XMIT 256 1006 1007 __u32 status; 1008 #define CRYPTO_SUCCESS 1 1009 #define CRYPTO_GENERIC_ERROR 2 1010 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4 1011 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8 1012 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16 1013 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32 1014 #define CRYPTO_INVALID_PACKET_SYNTAX 64 1015 #define CRYPTO_INVALID_PROTOCOL 128 1016 1017 __u8 proto; 1018 __u8 inner_ipproto; 1019 }; 1020 1021 struct sec_path { 1022 int len; 1023 int olen; 1024 1025 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 1026 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH]; 1027 }; 1028 1029 struct sec_path *secpath_set(struct sk_buff *skb); 1030 1031 static inline void 1032 secpath_reset(struct sk_buff *skb) 1033 { 1034 #ifdef CONFIG_XFRM 1035 skb_ext_del(skb, SKB_EXT_SEC_PATH); 1036 #endif 1037 } 1038 1039 static inline int 1040 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family) 1041 { 1042 switch (family) { 1043 case AF_INET: 1044 return addr->a4 == 0; 1045 case AF_INET6: 1046 return ipv6_addr_any(&addr->in6); 1047 } 1048 return 0; 1049 } 1050 1051 static inline int 1052 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1053 { 1054 return (tmpl->saddr.a4 && 1055 tmpl->saddr.a4 != x->props.saddr.a4); 1056 } 1057 1058 static inline int 1059 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1060 { 1061 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 1062 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 1063 } 1064 1065 static inline int 1066 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family) 1067 { 1068 switch (family) { 1069 case AF_INET: 1070 return __xfrm4_state_addr_cmp(tmpl, x); 1071 case AF_INET6: 1072 return __xfrm6_state_addr_cmp(tmpl, x); 1073 } 1074 return !0; 1075 } 1076 1077 #ifdef CONFIG_XFRM 1078 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, 1079 unsigned short family); 1080 1081 static inline int __xfrm_policy_check2(struct sock *sk, int dir, 1082 struct sk_buff *skb, 1083 unsigned int family, int reverse) 1084 { 1085 struct net *net = dev_net(skb->dev); 1086 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); 1087 1088 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 1089 return __xfrm_policy_check(sk, ndir, skb, family); 1090 1091 return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) || 1092 (skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY)) || 1093 __xfrm_policy_check(sk, ndir, skb, family); 1094 } 1095 1096 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1097 { 1098 return __xfrm_policy_check2(sk, dir, skb, family, 0); 1099 } 1100 1101 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1102 { 1103 return xfrm_policy_check(sk, dir, skb, AF_INET); 1104 } 1105 1106 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1107 { 1108 return xfrm_policy_check(sk, dir, skb, AF_INET6); 1109 } 1110 1111 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1112 struct sk_buff *skb) 1113 { 1114 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); 1115 } 1116 1117 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1118 struct sk_buff *skb) 1119 { 1120 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); 1121 } 1122 1123 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1124 unsigned int family, int reverse); 1125 1126 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1127 unsigned int family) 1128 { 1129 return __xfrm_decode_session(skb, fl, family, 0); 1130 } 1131 1132 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1133 struct flowi *fl, 1134 unsigned int family) 1135 { 1136 return __xfrm_decode_session(skb, fl, family, 1); 1137 } 1138 1139 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 1140 1141 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 1142 { 1143 struct net *net = dev_net(skb->dev); 1144 1145 return !net->xfrm.policy_count[XFRM_POLICY_OUT] || 1146 (skb_dst(skb)->flags & DST_NOXFRM) || 1147 __xfrm_route_forward(skb, family); 1148 } 1149 1150 static inline int xfrm4_route_forward(struct sk_buff *skb) 1151 { 1152 return xfrm_route_forward(skb, AF_INET); 1153 } 1154 1155 static inline int xfrm6_route_forward(struct sk_buff *skb) 1156 { 1157 return xfrm_route_forward(skb, AF_INET6); 1158 } 1159 1160 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk); 1161 1162 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) 1163 { 1164 sk->sk_policy[0] = NULL; 1165 sk->sk_policy[1] = NULL; 1166 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1])) 1167 return __xfrm_sk_clone_policy(sk, osk); 1168 return 0; 1169 } 1170 1171 int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 1172 1173 static inline void xfrm_sk_free_policy(struct sock *sk) 1174 { 1175 struct xfrm_policy *pol; 1176 1177 pol = rcu_dereference_protected(sk->sk_policy[0], 1); 1178 if (unlikely(pol != NULL)) { 1179 xfrm_policy_delete(pol, XFRM_POLICY_MAX); 1180 sk->sk_policy[0] = NULL; 1181 } 1182 pol = rcu_dereference_protected(sk->sk_policy[1], 1); 1183 if (unlikely(pol != NULL)) { 1184 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1); 1185 sk->sk_policy[1] = NULL; 1186 } 1187 } 1188 1189 #else 1190 1191 static inline void xfrm_sk_free_policy(struct sock *sk) {} 1192 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; } 1193 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 1194 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 1195 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1196 { 1197 return 1; 1198 } 1199 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1200 { 1201 return 1; 1202 } 1203 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1204 { 1205 return 1; 1206 } 1207 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1208 struct flowi *fl, 1209 unsigned int family) 1210 { 1211 return -ENOSYS; 1212 } 1213 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1214 struct sk_buff *skb) 1215 { 1216 return 1; 1217 } 1218 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1219 struct sk_buff *skb) 1220 { 1221 return 1; 1222 } 1223 #endif 1224 1225 static __inline__ 1226 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family) 1227 { 1228 switch (family){ 1229 case AF_INET: 1230 return (xfrm_address_t *)&fl->u.ip4.daddr; 1231 case AF_INET6: 1232 return (xfrm_address_t *)&fl->u.ip6.daddr; 1233 } 1234 return NULL; 1235 } 1236 1237 static __inline__ 1238 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family) 1239 { 1240 switch (family){ 1241 case AF_INET: 1242 return (xfrm_address_t *)&fl->u.ip4.saddr; 1243 case AF_INET6: 1244 return (xfrm_address_t *)&fl->u.ip6.saddr; 1245 } 1246 return NULL; 1247 } 1248 1249 static __inline__ 1250 void xfrm_flowi_addr_get(const struct flowi *fl, 1251 xfrm_address_t *saddr, xfrm_address_t *daddr, 1252 unsigned short family) 1253 { 1254 switch(family) { 1255 case AF_INET: 1256 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4)); 1257 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4)); 1258 break; 1259 case AF_INET6: 1260 saddr->in6 = fl->u.ip6.saddr; 1261 daddr->in6 = fl->u.ip6.daddr; 1262 break; 1263 } 1264 } 1265 1266 static __inline__ int 1267 __xfrm4_state_addr_check(const struct xfrm_state *x, 1268 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1269 { 1270 if (daddr->a4 == x->id.daddr.a4 && 1271 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 1272 return 1; 1273 return 0; 1274 } 1275 1276 static __inline__ int 1277 __xfrm6_state_addr_check(const struct xfrm_state *x, 1278 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1279 { 1280 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 1281 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) || 1282 ipv6_addr_any((struct in6_addr *)saddr) || 1283 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 1284 return 1; 1285 return 0; 1286 } 1287 1288 static __inline__ int 1289 xfrm_state_addr_check(const struct xfrm_state *x, 1290 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1291 unsigned short family) 1292 { 1293 switch (family) { 1294 case AF_INET: 1295 return __xfrm4_state_addr_check(x, daddr, saddr); 1296 case AF_INET6: 1297 return __xfrm6_state_addr_check(x, daddr, saddr); 1298 } 1299 return 0; 1300 } 1301 1302 static __inline__ int 1303 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl, 1304 unsigned short family) 1305 { 1306 switch (family) { 1307 case AF_INET: 1308 return __xfrm4_state_addr_check(x, 1309 (const xfrm_address_t *)&fl->u.ip4.daddr, 1310 (const xfrm_address_t *)&fl->u.ip4.saddr); 1311 case AF_INET6: 1312 return __xfrm6_state_addr_check(x, 1313 (const xfrm_address_t *)&fl->u.ip6.daddr, 1314 (const xfrm_address_t *)&fl->u.ip6.saddr); 1315 } 1316 return 0; 1317 } 1318 1319 static inline int xfrm_state_kern(const struct xfrm_state *x) 1320 { 1321 return atomic_read(&x->tunnel_users); 1322 } 1323 1324 static inline bool xfrm_id_proto_valid(u8 proto) 1325 { 1326 switch (proto) { 1327 case IPPROTO_AH: 1328 case IPPROTO_ESP: 1329 case IPPROTO_COMP: 1330 #if IS_ENABLED(CONFIG_IPV6) 1331 case IPPROTO_ROUTING: 1332 case IPPROTO_DSTOPTS: 1333 #endif 1334 return true; 1335 default: 1336 return false; 1337 } 1338 } 1339 1340 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */ 1341 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 1342 { 1343 return (!userproto || proto == userproto || 1344 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 1345 proto == IPPROTO_ESP || 1346 proto == IPPROTO_COMP))); 1347 } 1348 1349 /* 1350 * xfrm algorithm information 1351 */ 1352 struct xfrm_algo_aead_info { 1353 char *geniv; 1354 u16 icv_truncbits; 1355 }; 1356 1357 struct xfrm_algo_auth_info { 1358 u16 icv_truncbits; 1359 u16 icv_fullbits; 1360 }; 1361 1362 struct xfrm_algo_encr_info { 1363 char *geniv; 1364 u16 blockbits; 1365 u16 defkeybits; 1366 }; 1367 1368 struct xfrm_algo_comp_info { 1369 u16 threshold; 1370 }; 1371 1372 struct xfrm_algo_desc { 1373 char *name; 1374 char *compat; 1375 u8 available:1; 1376 u8 pfkey_supported:1; 1377 union { 1378 struct xfrm_algo_aead_info aead; 1379 struct xfrm_algo_auth_info auth; 1380 struct xfrm_algo_encr_info encr; 1381 struct xfrm_algo_comp_info comp; 1382 } uinfo; 1383 struct sadb_alg desc; 1384 }; 1385 1386 /* XFRM protocol handlers. */ 1387 struct xfrm4_protocol { 1388 int (*handler)(struct sk_buff *skb); 1389 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1390 int encap_type); 1391 int (*cb_handler)(struct sk_buff *skb, int err); 1392 int (*err_handler)(struct sk_buff *skb, u32 info); 1393 1394 struct xfrm4_protocol __rcu *next; 1395 int priority; 1396 }; 1397 1398 struct xfrm6_protocol { 1399 int (*handler)(struct sk_buff *skb); 1400 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1401 int encap_type); 1402 int (*cb_handler)(struct sk_buff *skb, int err); 1403 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1404 u8 type, u8 code, int offset, __be32 info); 1405 1406 struct xfrm6_protocol __rcu *next; 1407 int priority; 1408 }; 1409 1410 /* XFRM tunnel handlers. */ 1411 struct xfrm_tunnel { 1412 int (*handler)(struct sk_buff *skb); 1413 int (*cb_handler)(struct sk_buff *skb, int err); 1414 int (*err_handler)(struct sk_buff *skb, u32 info); 1415 1416 struct xfrm_tunnel __rcu *next; 1417 int priority; 1418 }; 1419 1420 struct xfrm6_tunnel { 1421 int (*handler)(struct sk_buff *skb); 1422 int (*cb_handler)(struct sk_buff *skb, int err); 1423 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1424 u8 type, u8 code, int offset, __be32 info); 1425 struct xfrm6_tunnel __rcu *next; 1426 int priority; 1427 }; 1428 1429 void xfrm_init(void); 1430 void xfrm4_init(void); 1431 int xfrm_state_init(struct net *net); 1432 void xfrm_state_fini(struct net *net); 1433 void xfrm4_state_init(void); 1434 void xfrm4_protocol_init(void); 1435 #ifdef CONFIG_XFRM 1436 int xfrm6_init(void); 1437 void xfrm6_fini(void); 1438 int xfrm6_state_init(void); 1439 void xfrm6_state_fini(void); 1440 int xfrm6_protocol_init(void); 1441 void xfrm6_protocol_fini(void); 1442 #else 1443 static inline int xfrm6_init(void) 1444 { 1445 return 0; 1446 } 1447 static inline void xfrm6_fini(void) 1448 { 1449 ; 1450 } 1451 #endif 1452 1453 #ifdef CONFIG_XFRM_STATISTICS 1454 int xfrm_proc_init(struct net *net); 1455 void xfrm_proc_fini(struct net *net); 1456 #endif 1457 1458 int xfrm_sysctl_init(struct net *net); 1459 #ifdef CONFIG_SYSCTL 1460 void xfrm_sysctl_fini(struct net *net); 1461 #else 1462 static inline void xfrm_sysctl_fini(struct net *net) 1463 { 1464 } 1465 #endif 1466 1467 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 1468 struct xfrm_address_filter *filter); 1469 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1470 int (*func)(struct xfrm_state *, int, void*), void *); 1471 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net); 1472 struct xfrm_state *xfrm_state_alloc(struct net *net); 1473 void xfrm_state_free(struct xfrm_state *x); 1474 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr, 1475 const xfrm_address_t *saddr, 1476 const struct flowi *fl, 1477 struct xfrm_tmpl *tmpl, 1478 struct xfrm_policy *pol, int *err, 1479 unsigned short family, u32 if_id); 1480 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id, 1481 xfrm_address_t *daddr, 1482 xfrm_address_t *saddr, 1483 unsigned short family, 1484 u8 mode, u8 proto, u32 reqid); 1485 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1486 unsigned short family); 1487 int xfrm_state_check_expire(struct xfrm_state *x); 1488 void xfrm_state_insert(struct xfrm_state *x); 1489 int xfrm_state_add(struct xfrm_state *x); 1490 int xfrm_state_update(struct xfrm_state *x); 1491 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark, 1492 const xfrm_address_t *daddr, __be32 spi, 1493 u8 proto, unsigned short family); 1494 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1495 const xfrm_address_t *daddr, 1496 const xfrm_address_t *saddr, 1497 u8 proto, 1498 unsigned short family); 1499 #ifdef CONFIG_XFRM_SUB_POLICY 1500 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1501 unsigned short family); 1502 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1503 unsigned short family); 1504 #else 1505 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s, 1506 int n, unsigned short family) 1507 { 1508 } 1509 1510 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s, 1511 int n, unsigned short family) 1512 { 1513 } 1514 #endif 1515 1516 struct xfrmk_sadinfo { 1517 u32 sadhcnt; /* current hash bkts */ 1518 u32 sadhmcnt; /* max allowed hash bkts */ 1519 u32 sadcnt; /* current running count */ 1520 }; 1521 1522 struct xfrmk_spdinfo { 1523 u32 incnt; 1524 u32 outcnt; 1525 u32 fwdcnt; 1526 u32 inscnt; 1527 u32 outscnt; 1528 u32 fwdscnt; 1529 u32 spdhcnt; 1530 u32 spdhmcnt; 1531 }; 1532 1533 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1534 int xfrm_state_delete(struct xfrm_state *x); 1535 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync); 1536 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid); 1537 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); 1538 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); 1539 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq); 1540 int xfrm_init_replay(struct xfrm_state *x); 1541 u32 __xfrm_state_mtu(struct xfrm_state *x, int mtu); 1542 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu); 1543 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload); 1544 int xfrm_init_state(struct xfrm_state *x); 1545 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type); 1546 int xfrm_input_resume(struct sk_buff *skb, int nexthdr); 1547 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb, 1548 int (*finish)(struct net *, struct sock *, 1549 struct sk_buff *)); 1550 int xfrm_trans_queue(struct sk_buff *skb, 1551 int (*finish)(struct net *, struct sock *, 1552 struct sk_buff *)); 1553 int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err); 1554 int xfrm_output(struct sock *sk, struct sk_buff *skb); 1555 1556 #if IS_ENABLED(CONFIG_NET_PKTGEN) 1557 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb); 1558 #endif 1559 1560 void xfrm_local_error(struct sk_buff *skb, int mtu); 1561 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1562 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1563 int encap_type); 1564 int xfrm4_transport_finish(struct sk_buff *skb, int async); 1565 int xfrm4_rcv(struct sk_buff *skb); 1566 1567 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1568 { 1569 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL; 1570 XFRM_SPI_SKB_CB(skb)->family = AF_INET; 1571 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); 1572 return xfrm_input(skb, nexthdr, spi, 0); 1573 } 1574 1575 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1576 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol); 1577 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol); 1578 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1579 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1580 void xfrm4_local_error(struct sk_buff *skb, u32 mtu); 1581 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1582 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi, 1583 struct ip6_tnl *t); 1584 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1585 int encap_type); 1586 int xfrm6_transport_finish(struct sk_buff *skb, int async); 1587 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t); 1588 int xfrm6_rcv(struct sk_buff *skb); 1589 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1590 xfrm_address_t *saddr, u8 proto); 1591 void xfrm6_local_error(struct sk_buff *skb, u32 mtu); 1592 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol); 1593 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol); 1594 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1595 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1596 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr); 1597 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr); 1598 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1599 1600 #ifdef CONFIG_XFRM 1601 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu); 1602 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1603 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1604 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, 1605 int optlen); 1606 #else 1607 static inline int xfrm_user_policy(struct sock *sk, int optname, 1608 sockptr_t optval, int optlen) 1609 { 1610 return -ENOPROTOOPT; 1611 } 1612 #endif 1613 1614 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif, 1615 const xfrm_address_t *saddr, 1616 const xfrm_address_t *daddr, 1617 int family, u32 mark); 1618 1619 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); 1620 1621 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); 1622 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, 1623 int (*func)(struct xfrm_policy *, int, int, void*), 1624 void *); 1625 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net); 1626 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1627 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, 1628 const struct xfrm_mark *mark, 1629 u32 if_id, u8 type, int dir, 1630 struct xfrm_selector *sel, 1631 struct xfrm_sec_ctx *ctx, int delete, 1632 int *err); 1633 struct xfrm_policy *xfrm_policy_byid(struct net *net, 1634 const struct xfrm_mark *mark, u32 if_id, 1635 u8 type, int dir, u32 id, int delete, 1636 int *err); 1637 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid); 1638 void xfrm_policy_hash_rebuild(struct net *net); 1639 u32 xfrm_get_acqseq(void); 1640 int verify_spi_info(u8 proto, u32 min, u32 max); 1641 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 1642 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, 1643 u8 mode, u32 reqid, u32 if_id, u8 proto, 1644 const xfrm_address_t *daddr, 1645 const xfrm_address_t *saddr, int create, 1646 unsigned short family); 1647 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1648 1649 #ifdef CONFIG_XFRM_MIGRATE 1650 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1651 const struct xfrm_migrate *m, int num_bundles, 1652 const struct xfrm_kmaddress *k, 1653 const struct xfrm_encap_tmpl *encap); 1654 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net); 1655 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 1656 struct xfrm_migrate *m, 1657 struct xfrm_encap_tmpl *encap); 1658 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1659 struct xfrm_migrate *m, int num_bundles, 1660 struct xfrm_kmaddress *k, struct net *net, 1661 struct xfrm_encap_tmpl *encap); 1662 #endif 1663 1664 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1665 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid); 1666 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, 1667 xfrm_address_t *addr); 1668 1669 void xfrm_input_init(void); 1670 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1671 1672 void xfrm_probe_algs(void); 1673 int xfrm_count_pfkey_auth_supported(void); 1674 int xfrm_count_pfkey_enc_supported(void); 1675 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1676 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1677 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1678 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1679 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1680 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe); 1681 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe); 1682 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe); 1683 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, 1684 int probe); 1685 1686 static inline bool xfrm6_addr_equal(const xfrm_address_t *a, 1687 const xfrm_address_t *b) 1688 { 1689 return ipv6_addr_equal((const struct in6_addr *)a, 1690 (const struct in6_addr *)b); 1691 } 1692 1693 static inline bool xfrm_addr_equal(const xfrm_address_t *a, 1694 const xfrm_address_t *b, 1695 sa_family_t family) 1696 { 1697 switch (family) { 1698 default: 1699 case AF_INET: 1700 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0; 1701 case AF_INET6: 1702 return xfrm6_addr_equal(a, b); 1703 } 1704 } 1705 1706 static inline int xfrm_policy_id2dir(u32 index) 1707 { 1708 return index & 7; 1709 } 1710 1711 #ifdef CONFIG_XFRM 1712 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq); 1713 int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq); 1714 void xfrm_replay_notify(struct xfrm_state *x, int event); 1715 int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb); 1716 int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq); 1717 1718 static inline int xfrm_aevent_is_on(struct net *net) 1719 { 1720 struct sock *nlsk; 1721 int ret = 0; 1722 1723 rcu_read_lock(); 1724 nlsk = rcu_dereference(net->xfrm.nlsk); 1725 if (nlsk) 1726 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1727 rcu_read_unlock(); 1728 return ret; 1729 } 1730 1731 static inline int xfrm_acquire_is_on(struct net *net) 1732 { 1733 struct sock *nlsk; 1734 int ret = 0; 1735 1736 rcu_read_lock(); 1737 nlsk = rcu_dereference(net->xfrm.nlsk); 1738 if (nlsk) 1739 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE); 1740 rcu_read_unlock(); 1741 1742 return ret; 1743 } 1744 #endif 1745 1746 static inline unsigned int aead_len(struct xfrm_algo_aead *alg) 1747 { 1748 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1749 } 1750 1751 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg) 1752 { 1753 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1754 } 1755 1756 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg) 1757 { 1758 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1759 } 1760 1761 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn) 1762 { 1763 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32); 1764 } 1765 1766 #ifdef CONFIG_XFRM_MIGRATE 1767 static inline int xfrm_replay_clone(struct xfrm_state *x, 1768 struct xfrm_state *orig) 1769 { 1770 1771 x->replay_esn = kmemdup(orig->replay_esn, 1772 xfrm_replay_state_esn_len(orig->replay_esn), 1773 GFP_KERNEL); 1774 if (!x->replay_esn) 1775 return -ENOMEM; 1776 x->preplay_esn = kmemdup(orig->preplay_esn, 1777 xfrm_replay_state_esn_len(orig->preplay_esn), 1778 GFP_KERNEL); 1779 if (!x->preplay_esn) 1780 return -ENOMEM; 1781 1782 return 0; 1783 } 1784 1785 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig) 1786 { 1787 return kmemdup(orig, aead_len(orig), GFP_KERNEL); 1788 } 1789 1790 1791 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1792 { 1793 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); 1794 } 1795 1796 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig) 1797 { 1798 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL); 1799 } 1800 1801 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1802 { 1803 int i; 1804 for (i = 0; i < n; i++) 1805 xfrm_state_put(*(states + i)); 1806 } 1807 1808 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1809 { 1810 int i; 1811 for (i = 0; i < n; i++) 1812 xfrm_state_delete(*(states + i)); 1813 } 1814 #endif 1815 1816 #ifdef CONFIG_XFRM 1817 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) 1818 { 1819 struct sec_path *sp = skb_sec_path(skb); 1820 1821 return sp->xvec[sp->len - 1]; 1822 } 1823 #endif 1824 1825 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb) 1826 { 1827 #ifdef CONFIG_XFRM 1828 struct sec_path *sp = skb_sec_path(skb); 1829 1830 if (!sp || !sp->olen || sp->len != sp->olen) 1831 return NULL; 1832 1833 return &sp->ovec[sp->olen - 1]; 1834 #else 1835 return NULL; 1836 #endif 1837 } 1838 1839 void __init xfrm_dev_init(void); 1840 1841 #ifdef CONFIG_XFRM_OFFLOAD 1842 void xfrm_dev_resume(struct sk_buff *skb); 1843 void xfrm_dev_backlog(struct softnet_data *sd); 1844 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again); 1845 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, 1846 struct xfrm_user_offload *xuo); 1847 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x); 1848 1849 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 1850 { 1851 struct xfrm_state_offload *xso = &x->xso; 1852 1853 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn) 1854 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x); 1855 } 1856 1857 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 1858 { 1859 struct xfrm_state *x = dst->xfrm; 1860 struct xfrm_dst *xdst; 1861 1862 if (!x || !x->type_offload) 1863 return false; 1864 1865 xdst = (struct xfrm_dst *) dst; 1866 if (!x->xso.offload_handle && !xdst->child->xfrm) 1867 return true; 1868 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) && 1869 !xdst->child->xfrm) 1870 return true; 1871 1872 return false; 1873 } 1874 1875 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 1876 { 1877 struct xfrm_state_offload *xso = &x->xso; 1878 1879 if (xso->dev) 1880 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x); 1881 } 1882 1883 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1884 { 1885 struct xfrm_state_offload *xso = &x->xso; 1886 struct net_device *dev = xso->dev; 1887 1888 if (dev && dev->xfrmdev_ops) { 1889 if (dev->xfrmdev_ops->xdo_dev_state_free) 1890 dev->xfrmdev_ops->xdo_dev_state_free(x); 1891 xso->dev = NULL; 1892 dev_put(dev); 1893 } 1894 } 1895 #else 1896 static inline void xfrm_dev_resume(struct sk_buff *skb) 1897 { 1898 } 1899 1900 static inline void xfrm_dev_backlog(struct softnet_data *sd) 1901 { 1902 } 1903 1904 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again) 1905 { 1906 return skb; 1907 } 1908 1909 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo) 1910 { 1911 return 0; 1912 } 1913 1914 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 1915 { 1916 } 1917 1918 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1919 { 1920 } 1921 1922 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) 1923 { 1924 return false; 1925 } 1926 1927 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 1928 { 1929 } 1930 1931 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 1932 { 1933 return false; 1934 } 1935 #endif 1936 1937 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) 1938 { 1939 if (attrs[XFRMA_MARK]) 1940 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark)); 1941 else 1942 m->v = m->m = 0; 1943 1944 return m->v & m->m; 1945 } 1946 1947 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m) 1948 { 1949 int ret = 0; 1950 1951 if (m->m | m->v) 1952 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); 1953 return ret; 1954 } 1955 1956 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x) 1957 { 1958 struct xfrm_mark *m = &x->props.smark; 1959 1960 return (m->v & m->m) | (mark & ~m->m); 1961 } 1962 1963 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id) 1964 { 1965 int ret = 0; 1966 1967 if (if_id) 1968 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id); 1969 return ret; 1970 } 1971 1972 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x, 1973 unsigned int family) 1974 { 1975 bool tunnel = false; 1976 1977 switch(family) { 1978 case AF_INET: 1979 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) 1980 tunnel = true; 1981 break; 1982 case AF_INET6: 1983 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) 1984 tunnel = true; 1985 break; 1986 } 1987 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL)) 1988 return -EINVAL; 1989 1990 return 0; 1991 } 1992 1993 extern const int xfrm_msg_min[XFRM_NR_MSGTYPES]; 1994 extern const struct nla_policy xfrma_policy[XFRMA_MAX+1]; 1995 1996 struct xfrm_translator { 1997 /* Allocate frag_list and put compat translation there */ 1998 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src); 1999 2000 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */ 2001 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh, 2002 int maxtype, const struct nla_policy *policy, 2003 struct netlink_ext_ack *extack); 2004 2005 /* Translate 32-bit user_policy from sockptr */ 2006 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen); 2007 2008 struct module *owner; 2009 }; 2010 2011 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT) 2012 extern int xfrm_register_translator(struct xfrm_translator *xtr); 2013 extern int xfrm_unregister_translator(struct xfrm_translator *xtr); 2014 extern struct xfrm_translator *xfrm_get_translator(void); 2015 extern void xfrm_put_translator(struct xfrm_translator *xtr); 2016 #else 2017 static inline struct xfrm_translator *xfrm_get_translator(void) 2018 { 2019 return NULL; 2020 } 2021 static inline void xfrm_put_translator(struct xfrm_translator *xtr) 2022 { 2023 } 2024 #endif 2025 2026 #if IS_ENABLED(CONFIG_IPV6) 2027 static inline bool xfrm6_local_dontfrag(const struct sock *sk) 2028 { 2029 int proto; 2030 2031 if (!sk || sk->sk_family != AF_INET6) 2032 return false; 2033 2034 proto = sk->sk_protocol; 2035 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW) 2036 return inet6_sk(sk)->dontfrag; 2037 2038 return false; 2039 } 2040 #endif 2041 #endif /* _NET_XFRM_H */ 2042