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 static inline bool 1079 xfrm_default_allow(struct net *net, int dir) 1080 { 1081 u8 def = net->xfrm.policy_default; 1082 1083 switch (dir) { 1084 case XFRM_POLICY_IN: 1085 return def & XFRM_POL_DEFAULT_IN ? false : true; 1086 case XFRM_POLICY_OUT: 1087 return def & XFRM_POL_DEFAULT_OUT ? false : true; 1088 case XFRM_POLICY_FWD: 1089 return def & XFRM_POL_DEFAULT_FWD ? false : true; 1090 } 1091 return false; 1092 } 1093 1094 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, 1095 unsigned short family); 1096 1097 static inline int __xfrm_policy_check2(struct sock *sk, int dir, 1098 struct sk_buff *skb, 1099 unsigned int family, int reverse) 1100 { 1101 struct net *net = dev_net(skb->dev); 1102 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); 1103 1104 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 1105 return __xfrm_policy_check(sk, ndir, skb, family); 1106 1107 if (xfrm_default_allow(net, dir)) 1108 return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) || 1109 (skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY)) || 1110 __xfrm_policy_check(sk, ndir, skb, family); 1111 else 1112 return (skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY)) || 1113 __xfrm_policy_check(sk, ndir, skb, family); 1114 } 1115 1116 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1117 { 1118 return __xfrm_policy_check2(sk, dir, skb, family, 0); 1119 } 1120 1121 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1122 { 1123 return xfrm_policy_check(sk, dir, skb, AF_INET); 1124 } 1125 1126 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1127 { 1128 return xfrm_policy_check(sk, dir, skb, AF_INET6); 1129 } 1130 1131 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1132 struct sk_buff *skb) 1133 { 1134 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); 1135 } 1136 1137 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1138 struct sk_buff *skb) 1139 { 1140 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); 1141 } 1142 1143 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1144 unsigned int family, int reverse); 1145 1146 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1147 unsigned int family) 1148 { 1149 return __xfrm_decode_session(skb, fl, family, 0); 1150 } 1151 1152 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1153 struct flowi *fl, 1154 unsigned int family) 1155 { 1156 return __xfrm_decode_session(skb, fl, family, 1); 1157 } 1158 1159 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 1160 1161 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 1162 { 1163 struct net *net = dev_net(skb->dev); 1164 1165 if (xfrm_default_allow(net, XFRM_POLICY_FWD)) 1166 return !net->xfrm.policy_count[XFRM_POLICY_OUT] || 1167 (skb_dst(skb)->flags & DST_NOXFRM) || 1168 __xfrm_route_forward(skb, family); 1169 else 1170 return (skb_dst(skb)->flags & DST_NOXFRM) || 1171 __xfrm_route_forward(skb, family); 1172 } 1173 1174 static inline int xfrm4_route_forward(struct sk_buff *skb) 1175 { 1176 return xfrm_route_forward(skb, AF_INET); 1177 } 1178 1179 static inline int xfrm6_route_forward(struct sk_buff *skb) 1180 { 1181 return xfrm_route_forward(skb, AF_INET6); 1182 } 1183 1184 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk); 1185 1186 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) 1187 { 1188 sk->sk_policy[0] = NULL; 1189 sk->sk_policy[1] = NULL; 1190 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1])) 1191 return __xfrm_sk_clone_policy(sk, osk); 1192 return 0; 1193 } 1194 1195 int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 1196 1197 static inline void xfrm_sk_free_policy(struct sock *sk) 1198 { 1199 struct xfrm_policy *pol; 1200 1201 pol = rcu_dereference_protected(sk->sk_policy[0], 1); 1202 if (unlikely(pol != NULL)) { 1203 xfrm_policy_delete(pol, XFRM_POLICY_MAX); 1204 sk->sk_policy[0] = NULL; 1205 } 1206 pol = rcu_dereference_protected(sk->sk_policy[1], 1); 1207 if (unlikely(pol != NULL)) { 1208 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1); 1209 sk->sk_policy[1] = NULL; 1210 } 1211 } 1212 1213 #else 1214 1215 static inline void xfrm_sk_free_policy(struct sock *sk) {} 1216 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; } 1217 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 1218 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 1219 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1220 { 1221 return 1; 1222 } 1223 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1224 { 1225 return 1; 1226 } 1227 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1228 { 1229 return 1; 1230 } 1231 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1232 struct flowi *fl, 1233 unsigned int family) 1234 { 1235 return -ENOSYS; 1236 } 1237 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1238 struct sk_buff *skb) 1239 { 1240 return 1; 1241 } 1242 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1243 struct sk_buff *skb) 1244 { 1245 return 1; 1246 } 1247 #endif 1248 1249 static __inline__ 1250 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family) 1251 { 1252 switch (family){ 1253 case AF_INET: 1254 return (xfrm_address_t *)&fl->u.ip4.daddr; 1255 case AF_INET6: 1256 return (xfrm_address_t *)&fl->u.ip6.daddr; 1257 } 1258 return NULL; 1259 } 1260 1261 static __inline__ 1262 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family) 1263 { 1264 switch (family){ 1265 case AF_INET: 1266 return (xfrm_address_t *)&fl->u.ip4.saddr; 1267 case AF_INET6: 1268 return (xfrm_address_t *)&fl->u.ip6.saddr; 1269 } 1270 return NULL; 1271 } 1272 1273 static __inline__ 1274 void xfrm_flowi_addr_get(const struct flowi *fl, 1275 xfrm_address_t *saddr, xfrm_address_t *daddr, 1276 unsigned short family) 1277 { 1278 switch(family) { 1279 case AF_INET: 1280 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4)); 1281 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4)); 1282 break; 1283 case AF_INET6: 1284 saddr->in6 = fl->u.ip6.saddr; 1285 daddr->in6 = fl->u.ip6.daddr; 1286 break; 1287 } 1288 } 1289 1290 static __inline__ int 1291 __xfrm4_state_addr_check(const struct xfrm_state *x, 1292 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1293 { 1294 if (daddr->a4 == x->id.daddr.a4 && 1295 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 1296 return 1; 1297 return 0; 1298 } 1299 1300 static __inline__ int 1301 __xfrm6_state_addr_check(const struct xfrm_state *x, 1302 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1303 { 1304 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 1305 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) || 1306 ipv6_addr_any((struct in6_addr *)saddr) || 1307 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 1308 return 1; 1309 return 0; 1310 } 1311 1312 static __inline__ int 1313 xfrm_state_addr_check(const struct xfrm_state *x, 1314 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1315 unsigned short family) 1316 { 1317 switch (family) { 1318 case AF_INET: 1319 return __xfrm4_state_addr_check(x, daddr, saddr); 1320 case AF_INET6: 1321 return __xfrm6_state_addr_check(x, daddr, saddr); 1322 } 1323 return 0; 1324 } 1325 1326 static __inline__ int 1327 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl, 1328 unsigned short family) 1329 { 1330 switch (family) { 1331 case AF_INET: 1332 return __xfrm4_state_addr_check(x, 1333 (const xfrm_address_t *)&fl->u.ip4.daddr, 1334 (const xfrm_address_t *)&fl->u.ip4.saddr); 1335 case AF_INET6: 1336 return __xfrm6_state_addr_check(x, 1337 (const xfrm_address_t *)&fl->u.ip6.daddr, 1338 (const xfrm_address_t *)&fl->u.ip6.saddr); 1339 } 1340 return 0; 1341 } 1342 1343 static inline int xfrm_state_kern(const struct xfrm_state *x) 1344 { 1345 return atomic_read(&x->tunnel_users); 1346 } 1347 1348 static inline bool xfrm_id_proto_valid(u8 proto) 1349 { 1350 switch (proto) { 1351 case IPPROTO_AH: 1352 case IPPROTO_ESP: 1353 case IPPROTO_COMP: 1354 #if IS_ENABLED(CONFIG_IPV6) 1355 case IPPROTO_ROUTING: 1356 case IPPROTO_DSTOPTS: 1357 #endif 1358 return true; 1359 default: 1360 return false; 1361 } 1362 } 1363 1364 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */ 1365 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 1366 { 1367 return (!userproto || proto == userproto || 1368 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 1369 proto == IPPROTO_ESP || 1370 proto == IPPROTO_COMP))); 1371 } 1372 1373 /* 1374 * xfrm algorithm information 1375 */ 1376 struct xfrm_algo_aead_info { 1377 char *geniv; 1378 u16 icv_truncbits; 1379 }; 1380 1381 struct xfrm_algo_auth_info { 1382 u16 icv_truncbits; 1383 u16 icv_fullbits; 1384 }; 1385 1386 struct xfrm_algo_encr_info { 1387 char *geniv; 1388 u16 blockbits; 1389 u16 defkeybits; 1390 }; 1391 1392 struct xfrm_algo_comp_info { 1393 u16 threshold; 1394 }; 1395 1396 struct xfrm_algo_desc { 1397 char *name; 1398 char *compat; 1399 u8 available:1; 1400 u8 pfkey_supported:1; 1401 union { 1402 struct xfrm_algo_aead_info aead; 1403 struct xfrm_algo_auth_info auth; 1404 struct xfrm_algo_encr_info encr; 1405 struct xfrm_algo_comp_info comp; 1406 } uinfo; 1407 struct sadb_alg desc; 1408 }; 1409 1410 /* XFRM protocol handlers. */ 1411 struct xfrm4_protocol { 1412 int (*handler)(struct sk_buff *skb); 1413 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1414 int encap_type); 1415 int (*cb_handler)(struct sk_buff *skb, int err); 1416 int (*err_handler)(struct sk_buff *skb, u32 info); 1417 1418 struct xfrm4_protocol __rcu *next; 1419 int priority; 1420 }; 1421 1422 struct xfrm6_protocol { 1423 int (*handler)(struct sk_buff *skb); 1424 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1425 int encap_type); 1426 int (*cb_handler)(struct sk_buff *skb, int err); 1427 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1428 u8 type, u8 code, int offset, __be32 info); 1429 1430 struct xfrm6_protocol __rcu *next; 1431 int priority; 1432 }; 1433 1434 /* XFRM tunnel handlers. */ 1435 struct xfrm_tunnel { 1436 int (*handler)(struct sk_buff *skb); 1437 int (*cb_handler)(struct sk_buff *skb, int err); 1438 int (*err_handler)(struct sk_buff *skb, u32 info); 1439 1440 struct xfrm_tunnel __rcu *next; 1441 int priority; 1442 }; 1443 1444 struct xfrm6_tunnel { 1445 int (*handler)(struct sk_buff *skb); 1446 int (*cb_handler)(struct sk_buff *skb, int err); 1447 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1448 u8 type, u8 code, int offset, __be32 info); 1449 struct xfrm6_tunnel __rcu *next; 1450 int priority; 1451 }; 1452 1453 void xfrm_init(void); 1454 void xfrm4_init(void); 1455 int xfrm_state_init(struct net *net); 1456 void xfrm_state_fini(struct net *net); 1457 void xfrm4_state_init(void); 1458 void xfrm4_protocol_init(void); 1459 #ifdef CONFIG_XFRM 1460 int xfrm6_init(void); 1461 void xfrm6_fini(void); 1462 int xfrm6_state_init(void); 1463 void xfrm6_state_fini(void); 1464 int xfrm6_protocol_init(void); 1465 void xfrm6_protocol_fini(void); 1466 #else 1467 static inline int xfrm6_init(void) 1468 { 1469 return 0; 1470 } 1471 static inline void xfrm6_fini(void) 1472 { 1473 ; 1474 } 1475 #endif 1476 1477 #ifdef CONFIG_XFRM_STATISTICS 1478 int xfrm_proc_init(struct net *net); 1479 void xfrm_proc_fini(struct net *net); 1480 #endif 1481 1482 int xfrm_sysctl_init(struct net *net); 1483 #ifdef CONFIG_SYSCTL 1484 void xfrm_sysctl_fini(struct net *net); 1485 #else 1486 static inline void xfrm_sysctl_fini(struct net *net) 1487 { 1488 } 1489 #endif 1490 1491 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 1492 struct xfrm_address_filter *filter); 1493 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1494 int (*func)(struct xfrm_state *, int, void*), void *); 1495 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net); 1496 struct xfrm_state *xfrm_state_alloc(struct net *net); 1497 void xfrm_state_free(struct xfrm_state *x); 1498 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr, 1499 const xfrm_address_t *saddr, 1500 const struct flowi *fl, 1501 struct xfrm_tmpl *tmpl, 1502 struct xfrm_policy *pol, int *err, 1503 unsigned short family, u32 if_id); 1504 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id, 1505 xfrm_address_t *daddr, 1506 xfrm_address_t *saddr, 1507 unsigned short family, 1508 u8 mode, u8 proto, u32 reqid); 1509 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1510 unsigned short family); 1511 int xfrm_state_check_expire(struct xfrm_state *x); 1512 void xfrm_state_insert(struct xfrm_state *x); 1513 int xfrm_state_add(struct xfrm_state *x); 1514 int xfrm_state_update(struct xfrm_state *x); 1515 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark, 1516 const xfrm_address_t *daddr, __be32 spi, 1517 u8 proto, unsigned short family); 1518 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1519 const xfrm_address_t *daddr, 1520 const xfrm_address_t *saddr, 1521 u8 proto, 1522 unsigned short family); 1523 #ifdef CONFIG_XFRM_SUB_POLICY 1524 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1525 unsigned short family); 1526 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1527 unsigned short family); 1528 #else 1529 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s, 1530 int n, unsigned short family) 1531 { 1532 } 1533 1534 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s, 1535 int n, unsigned short family) 1536 { 1537 } 1538 #endif 1539 1540 struct xfrmk_sadinfo { 1541 u32 sadhcnt; /* current hash bkts */ 1542 u32 sadhmcnt; /* max allowed hash bkts */ 1543 u32 sadcnt; /* current running count */ 1544 }; 1545 1546 struct xfrmk_spdinfo { 1547 u32 incnt; 1548 u32 outcnt; 1549 u32 fwdcnt; 1550 u32 inscnt; 1551 u32 outscnt; 1552 u32 fwdscnt; 1553 u32 spdhcnt; 1554 u32 spdhmcnt; 1555 }; 1556 1557 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1558 int xfrm_state_delete(struct xfrm_state *x); 1559 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync); 1560 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid); 1561 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); 1562 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); 1563 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq); 1564 int xfrm_init_replay(struct xfrm_state *x); 1565 u32 __xfrm_state_mtu(struct xfrm_state *x, int mtu); 1566 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu); 1567 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload); 1568 int xfrm_init_state(struct xfrm_state *x); 1569 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type); 1570 int xfrm_input_resume(struct sk_buff *skb, int nexthdr); 1571 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb, 1572 int (*finish)(struct net *, struct sock *, 1573 struct sk_buff *)); 1574 int xfrm_trans_queue(struct sk_buff *skb, 1575 int (*finish)(struct net *, struct sock *, 1576 struct sk_buff *)); 1577 int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err); 1578 int xfrm_output(struct sock *sk, struct sk_buff *skb); 1579 1580 #if IS_ENABLED(CONFIG_NET_PKTGEN) 1581 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb); 1582 #endif 1583 1584 void xfrm_local_error(struct sk_buff *skb, int mtu); 1585 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1586 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1587 int encap_type); 1588 int xfrm4_transport_finish(struct sk_buff *skb, int async); 1589 int xfrm4_rcv(struct sk_buff *skb); 1590 1591 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1592 { 1593 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL; 1594 XFRM_SPI_SKB_CB(skb)->family = AF_INET; 1595 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); 1596 return xfrm_input(skb, nexthdr, spi, 0); 1597 } 1598 1599 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1600 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol); 1601 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol); 1602 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1603 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1604 void xfrm4_local_error(struct sk_buff *skb, u32 mtu); 1605 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1606 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi, 1607 struct ip6_tnl *t); 1608 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1609 int encap_type); 1610 int xfrm6_transport_finish(struct sk_buff *skb, int async); 1611 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t); 1612 int xfrm6_rcv(struct sk_buff *skb); 1613 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1614 xfrm_address_t *saddr, u8 proto); 1615 void xfrm6_local_error(struct sk_buff *skb, u32 mtu); 1616 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol); 1617 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol); 1618 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1619 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1620 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr); 1621 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr); 1622 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1623 1624 #ifdef CONFIG_XFRM 1625 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu); 1626 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1627 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1628 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, 1629 int optlen); 1630 #else 1631 static inline int xfrm_user_policy(struct sock *sk, int optname, 1632 sockptr_t optval, int optlen) 1633 { 1634 return -ENOPROTOOPT; 1635 } 1636 #endif 1637 1638 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif, 1639 const xfrm_address_t *saddr, 1640 const xfrm_address_t *daddr, 1641 int family, u32 mark); 1642 1643 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); 1644 1645 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); 1646 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, 1647 int (*func)(struct xfrm_policy *, int, int, void*), 1648 void *); 1649 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net); 1650 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1651 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, 1652 const struct xfrm_mark *mark, 1653 u32 if_id, u8 type, int dir, 1654 struct xfrm_selector *sel, 1655 struct xfrm_sec_ctx *ctx, int delete, 1656 int *err); 1657 struct xfrm_policy *xfrm_policy_byid(struct net *net, 1658 const struct xfrm_mark *mark, u32 if_id, 1659 u8 type, int dir, u32 id, int delete, 1660 int *err); 1661 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid); 1662 void xfrm_policy_hash_rebuild(struct net *net); 1663 u32 xfrm_get_acqseq(void); 1664 int verify_spi_info(u8 proto, u32 min, u32 max); 1665 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 1666 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, 1667 u8 mode, u32 reqid, u32 if_id, u8 proto, 1668 const xfrm_address_t *daddr, 1669 const xfrm_address_t *saddr, int create, 1670 unsigned short family); 1671 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1672 1673 #ifdef CONFIG_XFRM_MIGRATE 1674 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1675 const struct xfrm_migrate *m, int num_bundles, 1676 const struct xfrm_kmaddress *k, 1677 const struct xfrm_encap_tmpl *encap); 1678 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net); 1679 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 1680 struct xfrm_migrate *m, 1681 struct xfrm_encap_tmpl *encap); 1682 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1683 struct xfrm_migrate *m, int num_bundles, 1684 struct xfrm_kmaddress *k, struct net *net, 1685 struct xfrm_encap_tmpl *encap); 1686 #endif 1687 1688 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1689 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid); 1690 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, 1691 xfrm_address_t *addr); 1692 1693 void xfrm_input_init(void); 1694 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1695 1696 void xfrm_probe_algs(void); 1697 int xfrm_count_pfkey_auth_supported(void); 1698 int xfrm_count_pfkey_enc_supported(void); 1699 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1700 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1701 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1702 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1703 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1704 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe); 1705 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe); 1706 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe); 1707 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, 1708 int probe); 1709 1710 static inline bool xfrm6_addr_equal(const xfrm_address_t *a, 1711 const xfrm_address_t *b) 1712 { 1713 return ipv6_addr_equal((const struct in6_addr *)a, 1714 (const struct in6_addr *)b); 1715 } 1716 1717 static inline bool xfrm_addr_equal(const xfrm_address_t *a, 1718 const xfrm_address_t *b, 1719 sa_family_t family) 1720 { 1721 switch (family) { 1722 default: 1723 case AF_INET: 1724 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0; 1725 case AF_INET6: 1726 return xfrm6_addr_equal(a, b); 1727 } 1728 } 1729 1730 static inline int xfrm_policy_id2dir(u32 index) 1731 { 1732 return index & 7; 1733 } 1734 1735 #ifdef CONFIG_XFRM 1736 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq); 1737 int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq); 1738 void xfrm_replay_notify(struct xfrm_state *x, int event); 1739 int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb); 1740 int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq); 1741 1742 static inline int xfrm_aevent_is_on(struct net *net) 1743 { 1744 struct sock *nlsk; 1745 int ret = 0; 1746 1747 rcu_read_lock(); 1748 nlsk = rcu_dereference(net->xfrm.nlsk); 1749 if (nlsk) 1750 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1751 rcu_read_unlock(); 1752 return ret; 1753 } 1754 1755 static inline int xfrm_acquire_is_on(struct net *net) 1756 { 1757 struct sock *nlsk; 1758 int ret = 0; 1759 1760 rcu_read_lock(); 1761 nlsk = rcu_dereference(net->xfrm.nlsk); 1762 if (nlsk) 1763 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE); 1764 rcu_read_unlock(); 1765 1766 return ret; 1767 } 1768 #endif 1769 1770 static inline unsigned int aead_len(struct xfrm_algo_aead *alg) 1771 { 1772 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1773 } 1774 1775 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg) 1776 { 1777 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1778 } 1779 1780 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg) 1781 { 1782 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1783 } 1784 1785 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn) 1786 { 1787 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32); 1788 } 1789 1790 #ifdef CONFIG_XFRM_MIGRATE 1791 static inline int xfrm_replay_clone(struct xfrm_state *x, 1792 struct xfrm_state *orig) 1793 { 1794 1795 x->replay_esn = kmemdup(orig->replay_esn, 1796 xfrm_replay_state_esn_len(orig->replay_esn), 1797 GFP_KERNEL); 1798 if (!x->replay_esn) 1799 return -ENOMEM; 1800 x->preplay_esn = kmemdup(orig->preplay_esn, 1801 xfrm_replay_state_esn_len(orig->preplay_esn), 1802 GFP_KERNEL); 1803 if (!x->preplay_esn) 1804 return -ENOMEM; 1805 1806 return 0; 1807 } 1808 1809 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig) 1810 { 1811 return kmemdup(orig, aead_len(orig), GFP_KERNEL); 1812 } 1813 1814 1815 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1816 { 1817 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); 1818 } 1819 1820 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig) 1821 { 1822 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL); 1823 } 1824 1825 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1826 { 1827 int i; 1828 for (i = 0; i < n; i++) 1829 xfrm_state_put(*(states + i)); 1830 } 1831 1832 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1833 { 1834 int i; 1835 for (i = 0; i < n; i++) 1836 xfrm_state_delete(*(states + i)); 1837 } 1838 #endif 1839 1840 #ifdef CONFIG_XFRM 1841 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) 1842 { 1843 struct sec_path *sp = skb_sec_path(skb); 1844 1845 return sp->xvec[sp->len - 1]; 1846 } 1847 #endif 1848 1849 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb) 1850 { 1851 #ifdef CONFIG_XFRM 1852 struct sec_path *sp = skb_sec_path(skb); 1853 1854 if (!sp || !sp->olen || sp->len != sp->olen) 1855 return NULL; 1856 1857 return &sp->ovec[sp->olen - 1]; 1858 #else 1859 return NULL; 1860 #endif 1861 } 1862 1863 void __init xfrm_dev_init(void); 1864 1865 #ifdef CONFIG_XFRM_OFFLOAD 1866 void xfrm_dev_resume(struct sk_buff *skb); 1867 void xfrm_dev_backlog(struct softnet_data *sd); 1868 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again); 1869 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, 1870 struct xfrm_user_offload *xuo); 1871 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x); 1872 1873 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 1874 { 1875 struct xfrm_state_offload *xso = &x->xso; 1876 1877 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn) 1878 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x); 1879 } 1880 1881 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 1882 { 1883 struct xfrm_state *x = dst->xfrm; 1884 struct xfrm_dst *xdst; 1885 1886 if (!x || !x->type_offload) 1887 return false; 1888 1889 xdst = (struct xfrm_dst *) dst; 1890 if (!x->xso.offload_handle && !xdst->child->xfrm) 1891 return true; 1892 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) && 1893 !xdst->child->xfrm) 1894 return true; 1895 1896 return false; 1897 } 1898 1899 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 1900 { 1901 struct xfrm_state_offload *xso = &x->xso; 1902 1903 if (xso->dev) 1904 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x); 1905 } 1906 1907 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1908 { 1909 struct xfrm_state_offload *xso = &x->xso; 1910 struct net_device *dev = xso->dev; 1911 1912 if (dev && dev->xfrmdev_ops) { 1913 if (dev->xfrmdev_ops->xdo_dev_state_free) 1914 dev->xfrmdev_ops->xdo_dev_state_free(x); 1915 xso->dev = NULL; 1916 dev_put(dev); 1917 } 1918 } 1919 #else 1920 static inline void xfrm_dev_resume(struct sk_buff *skb) 1921 { 1922 } 1923 1924 static inline void xfrm_dev_backlog(struct softnet_data *sd) 1925 { 1926 } 1927 1928 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again) 1929 { 1930 return skb; 1931 } 1932 1933 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo) 1934 { 1935 return 0; 1936 } 1937 1938 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 1939 { 1940 } 1941 1942 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1943 { 1944 } 1945 1946 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) 1947 { 1948 return false; 1949 } 1950 1951 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 1952 { 1953 } 1954 1955 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 1956 { 1957 return false; 1958 } 1959 #endif 1960 1961 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) 1962 { 1963 if (attrs[XFRMA_MARK]) 1964 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark)); 1965 else 1966 m->v = m->m = 0; 1967 1968 return m->v & m->m; 1969 } 1970 1971 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m) 1972 { 1973 int ret = 0; 1974 1975 if (m->m | m->v) 1976 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); 1977 return ret; 1978 } 1979 1980 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x) 1981 { 1982 struct xfrm_mark *m = &x->props.smark; 1983 1984 return (m->v & m->m) | (mark & ~m->m); 1985 } 1986 1987 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id) 1988 { 1989 int ret = 0; 1990 1991 if (if_id) 1992 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id); 1993 return ret; 1994 } 1995 1996 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x, 1997 unsigned int family) 1998 { 1999 bool tunnel = false; 2000 2001 switch(family) { 2002 case AF_INET: 2003 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) 2004 tunnel = true; 2005 break; 2006 case AF_INET6: 2007 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) 2008 tunnel = true; 2009 break; 2010 } 2011 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL)) 2012 return -EINVAL; 2013 2014 return 0; 2015 } 2016 2017 extern const int xfrm_msg_min[XFRM_NR_MSGTYPES]; 2018 extern const struct nla_policy xfrma_policy[XFRMA_MAX+1]; 2019 2020 struct xfrm_translator { 2021 /* Allocate frag_list and put compat translation there */ 2022 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src); 2023 2024 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */ 2025 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh, 2026 int maxtype, const struct nla_policy *policy, 2027 struct netlink_ext_ack *extack); 2028 2029 /* Translate 32-bit user_policy from sockptr */ 2030 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen); 2031 2032 struct module *owner; 2033 }; 2034 2035 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT) 2036 extern int xfrm_register_translator(struct xfrm_translator *xtr); 2037 extern int xfrm_unregister_translator(struct xfrm_translator *xtr); 2038 extern struct xfrm_translator *xfrm_get_translator(void); 2039 extern void xfrm_put_translator(struct xfrm_translator *xtr); 2040 #else 2041 static inline struct xfrm_translator *xfrm_get_translator(void) 2042 { 2043 return NULL; 2044 } 2045 static inline void xfrm_put_translator(struct xfrm_translator *xtr) 2046 { 2047 } 2048 #endif 2049 2050 #if IS_ENABLED(CONFIG_IPV6) 2051 static inline bool xfrm6_local_dontfrag(const struct sock *sk) 2052 { 2053 int proto; 2054 2055 if (!sk || sk->sk_family != AF_INET6) 2056 return false; 2057 2058 proto = sk->sk_protocol; 2059 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW) 2060 return inet6_sk(sk)->dontfrag; 2061 2062 return false; 2063 } 2064 #endif 2065 #endif /* _NET_XFRM_H */ 2066