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 enum { 130 XFRM_DEV_OFFLOAD_IN = 1, 131 XFRM_DEV_OFFLOAD_OUT, 132 }; 133 134 struct xfrm_dev_offload { 135 struct net_device *dev; 136 netdevice_tracker dev_tracker; 137 struct net_device *real_dev; 138 unsigned long offload_handle; 139 u8 dir : 2; 140 }; 141 142 struct xfrm_mode { 143 u8 encap; 144 u8 family; 145 u8 flags; 146 }; 147 148 /* Flags for xfrm_mode. */ 149 enum { 150 XFRM_MODE_FLAG_TUNNEL = 1, 151 }; 152 153 enum xfrm_replay_mode { 154 XFRM_REPLAY_MODE_LEGACY, 155 XFRM_REPLAY_MODE_BMP, 156 XFRM_REPLAY_MODE_ESN, 157 }; 158 159 /* Full description of state of transformer. */ 160 struct xfrm_state { 161 possible_net_t xs_net; 162 union { 163 struct hlist_node gclist; 164 struct hlist_node bydst; 165 }; 166 struct hlist_node bysrc; 167 struct hlist_node byspi; 168 struct hlist_node byseq; 169 170 refcount_t refcnt; 171 spinlock_t lock; 172 173 struct xfrm_id id; 174 struct xfrm_selector sel; 175 struct xfrm_mark mark; 176 u32 if_id; 177 u32 tfcpad; 178 179 u32 genid; 180 181 /* Key manager bits */ 182 struct xfrm_state_walk km; 183 184 /* Parameters of this state. */ 185 struct { 186 u32 reqid; 187 u8 mode; 188 u8 replay_window; 189 u8 aalgo, ealgo, calgo; 190 u8 flags; 191 u16 family; 192 xfrm_address_t saddr; 193 int header_len; 194 int trailer_len; 195 u32 extra_flags; 196 struct xfrm_mark smark; 197 } props; 198 199 struct xfrm_lifetime_cfg lft; 200 201 /* Data for transformer */ 202 struct xfrm_algo_auth *aalg; 203 struct xfrm_algo *ealg; 204 struct xfrm_algo *calg; 205 struct xfrm_algo_aead *aead; 206 const char *geniv; 207 208 /* mapping change rate limiting */ 209 __be16 new_mapping_sport; 210 u32 new_mapping; /* seconds */ 211 u32 mapping_maxage; /* seconds for input SA */ 212 213 /* Data for encapsulator */ 214 struct xfrm_encap_tmpl *encap; 215 struct sock __rcu *encap_sk; 216 217 /* Data for care-of address */ 218 xfrm_address_t *coaddr; 219 220 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 221 struct xfrm_state *tunnel; 222 223 /* If a tunnel, number of users + 1 */ 224 atomic_t tunnel_users; 225 226 /* State for replay detection */ 227 struct xfrm_replay_state replay; 228 struct xfrm_replay_state_esn *replay_esn; 229 230 /* Replay detection state at the time we sent the last notification */ 231 struct xfrm_replay_state preplay; 232 struct xfrm_replay_state_esn *preplay_esn; 233 234 /* replay detection mode */ 235 enum xfrm_replay_mode repl_mode; 236 /* internal flag that only holds state for delayed aevent at the 237 * moment 238 */ 239 u32 xflags; 240 241 /* Replay detection notification settings */ 242 u32 replay_maxage; 243 u32 replay_maxdiff; 244 245 /* Replay detection notification timer */ 246 struct timer_list rtimer; 247 248 /* Statistics */ 249 struct xfrm_stats stats; 250 251 struct xfrm_lifetime_cur curlft; 252 struct hrtimer mtimer; 253 254 struct xfrm_dev_offload xso; 255 256 /* used to fix curlft->add_time when changing date */ 257 long saved_tmo; 258 259 /* Last used time */ 260 time64_t lastused; 261 262 struct page_frag xfrag; 263 264 /* Reference to data common to all the instances of this 265 * transformer. */ 266 const struct xfrm_type *type; 267 struct xfrm_mode inner_mode; 268 struct xfrm_mode inner_mode_iaf; 269 struct xfrm_mode outer_mode; 270 271 const struct xfrm_type_offload *type_offload; 272 273 /* Security context */ 274 struct xfrm_sec_ctx *security; 275 276 /* Private data of this transformer, format is opaque, 277 * interpreted by xfrm_type methods. */ 278 void *data; 279 }; 280 281 static inline struct net *xs_net(struct xfrm_state *x) 282 { 283 return read_pnet(&x->xs_net); 284 } 285 286 /* xflags - make enum if more show up */ 287 #define XFRM_TIME_DEFER 1 288 #define XFRM_SOFT_EXPIRE 2 289 290 enum { 291 XFRM_STATE_VOID, 292 XFRM_STATE_ACQ, 293 XFRM_STATE_VALID, 294 XFRM_STATE_ERROR, 295 XFRM_STATE_EXPIRED, 296 XFRM_STATE_DEAD 297 }; 298 299 /* callback structure passed from either netlink or pfkey */ 300 struct km_event { 301 union { 302 u32 hard; 303 u32 proto; 304 u32 byid; 305 u32 aevent; 306 u32 type; 307 } data; 308 309 u32 seq; 310 u32 portid; 311 u32 event; 312 struct net *net; 313 }; 314 315 struct xfrm_if_cb { 316 struct xfrm_if *(*decode_session)(struct sk_buff *skb, 317 unsigned short family); 318 }; 319 320 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb); 321 void xfrm_if_unregister_cb(void); 322 323 struct net_device; 324 struct xfrm_type; 325 struct xfrm_dst; 326 struct xfrm_policy_afinfo { 327 struct dst_ops *dst_ops; 328 struct dst_entry *(*dst_lookup)(struct net *net, 329 int tos, int oif, 330 const xfrm_address_t *saddr, 331 const xfrm_address_t *daddr, 332 u32 mark); 333 int (*get_saddr)(struct net *net, int oif, 334 xfrm_address_t *saddr, 335 xfrm_address_t *daddr, 336 u32 mark); 337 int (*fill_dst)(struct xfrm_dst *xdst, 338 struct net_device *dev, 339 const struct flowi *fl); 340 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig); 341 }; 342 343 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family); 344 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo); 345 void km_policy_notify(struct xfrm_policy *xp, int dir, 346 const struct km_event *c); 347 void km_state_notify(struct xfrm_state *x, const struct km_event *c); 348 349 struct xfrm_tmpl; 350 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, 351 struct xfrm_policy *pol); 352 void km_state_expired(struct xfrm_state *x, int hard, u32 portid); 353 int __xfrm_state_delete(struct xfrm_state *x); 354 355 struct xfrm_state_afinfo { 356 u8 family; 357 u8 proto; 358 359 const struct xfrm_type_offload *type_offload_esp; 360 361 const struct xfrm_type *type_esp; 362 const struct xfrm_type *type_ipip; 363 const struct xfrm_type *type_ipip6; 364 const struct xfrm_type *type_comp; 365 const struct xfrm_type *type_ah; 366 const struct xfrm_type *type_routing; 367 const struct xfrm_type *type_dstopts; 368 369 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb); 370 int (*transport_finish)(struct sk_buff *skb, 371 int async); 372 void (*local_error)(struct sk_buff *skb, u32 mtu); 373 }; 374 375 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 376 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 377 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); 378 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family); 379 380 struct xfrm_input_afinfo { 381 u8 family; 382 bool is_ipip; 383 int (*callback)(struct sk_buff *skb, u8 protocol, 384 int err); 385 }; 386 387 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo); 388 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo); 389 390 void xfrm_flush_gc(void); 391 void xfrm_state_delete_tunnel(struct xfrm_state *x); 392 393 struct xfrm_type { 394 struct module *owner; 395 u8 proto; 396 u8 flags; 397 #define XFRM_TYPE_NON_FRAGMENT 1 398 #define XFRM_TYPE_REPLAY_PROT 2 399 #define XFRM_TYPE_LOCAL_COADDR 4 400 #define XFRM_TYPE_REMOTE_COADDR 8 401 402 int (*init_state)(struct xfrm_state *x); 403 void (*destructor)(struct xfrm_state *); 404 int (*input)(struct xfrm_state *, struct sk_buff *skb); 405 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 406 int (*reject)(struct xfrm_state *, struct sk_buff *, 407 const struct flowi *); 408 }; 409 410 int xfrm_register_type(const struct xfrm_type *type, unsigned short family); 411 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); 412 413 struct xfrm_type_offload { 414 struct module *owner; 415 u8 proto; 416 void (*encap)(struct xfrm_state *, struct sk_buff *pskb); 417 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb); 418 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features); 419 }; 420 421 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family); 422 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family); 423 424 static inline int xfrm_af2proto(unsigned int family) 425 { 426 switch(family) { 427 case AF_INET: 428 return IPPROTO_IPIP; 429 case AF_INET6: 430 return IPPROTO_IPV6; 431 default: 432 return 0; 433 } 434 } 435 436 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto) 437 { 438 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) || 439 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6)) 440 return &x->inner_mode; 441 else 442 return &x->inner_mode_iaf; 443 } 444 445 struct xfrm_tmpl { 446 /* id in template is interpreted as: 447 * daddr - destination of tunnel, may be zero for transport mode. 448 * spi - zero to acquire spi. Not zero if spi is static, then 449 * daddr must be fixed too. 450 * proto - AH/ESP/IPCOMP 451 */ 452 struct xfrm_id id; 453 454 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 455 xfrm_address_t saddr; 456 457 unsigned short encap_family; 458 459 u32 reqid; 460 461 /* Mode: transport, tunnel etc. */ 462 u8 mode; 463 464 /* Sharing mode: unique, this session only, this user only etc. */ 465 u8 share; 466 467 /* May skip this transfomration if no SA is found */ 468 u8 optional; 469 470 /* Skip aalgos/ealgos/calgos checks. */ 471 u8 allalgs; 472 473 /* Bit mask of algos allowed for acquisition */ 474 u32 aalgos; 475 u32 ealgos; 476 u32 calgos; 477 }; 478 479 #define XFRM_MAX_DEPTH 6 480 #define XFRM_MAX_OFFLOAD_DEPTH 1 481 482 struct xfrm_policy_walk_entry { 483 struct list_head all; 484 u8 dead; 485 }; 486 487 struct xfrm_policy_walk { 488 struct xfrm_policy_walk_entry walk; 489 u8 type; 490 u32 seq; 491 }; 492 493 struct xfrm_policy_queue { 494 struct sk_buff_head hold_queue; 495 struct timer_list hold_timer; 496 unsigned long timeout; 497 }; 498 499 struct xfrm_policy { 500 possible_net_t xp_net; 501 struct hlist_node bydst; 502 struct hlist_node byidx; 503 504 /* This lock only affects elements except for entry. */ 505 rwlock_t lock; 506 refcount_t refcnt; 507 u32 pos; 508 struct timer_list timer; 509 510 atomic_t genid; 511 u32 priority; 512 u32 index; 513 u32 if_id; 514 struct xfrm_mark mark; 515 struct xfrm_selector selector; 516 struct xfrm_lifetime_cfg lft; 517 struct xfrm_lifetime_cur curlft; 518 struct xfrm_policy_walk_entry walk; 519 struct xfrm_policy_queue polq; 520 bool bydst_reinsert; 521 u8 type; 522 u8 action; 523 u8 flags; 524 u8 xfrm_nr; 525 u16 family; 526 struct xfrm_sec_ctx *security; 527 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 528 struct hlist_node bydst_inexact_list; 529 struct rcu_head rcu; 530 }; 531 532 static inline struct net *xp_net(const struct xfrm_policy *xp) 533 { 534 return read_pnet(&xp->xp_net); 535 } 536 537 struct xfrm_kmaddress { 538 xfrm_address_t local; 539 xfrm_address_t remote; 540 u32 reserved; 541 u16 family; 542 }; 543 544 struct xfrm_migrate { 545 xfrm_address_t old_daddr; 546 xfrm_address_t old_saddr; 547 xfrm_address_t new_daddr; 548 xfrm_address_t new_saddr; 549 u8 proto; 550 u8 mode; 551 u16 reserved; 552 u32 reqid; 553 u16 old_family; 554 u16 new_family; 555 }; 556 557 #define XFRM_KM_TIMEOUT 30 558 /* what happened */ 559 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 560 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 561 562 /* default aevent timeout in units of 100ms */ 563 #define XFRM_AE_ETIME 10 564 /* Async Event timer multiplier */ 565 #define XFRM_AE_ETH_M 10 566 /* default seq threshold size */ 567 #define XFRM_AE_SEQT_SIZE 2 568 569 struct xfrm_mgr { 570 struct list_head list; 571 int (*notify)(struct xfrm_state *x, const struct km_event *c); 572 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp); 573 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 574 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 575 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c); 576 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 577 int (*migrate)(const struct xfrm_selector *sel, 578 u8 dir, u8 type, 579 const struct xfrm_migrate *m, 580 int num_bundles, 581 const struct xfrm_kmaddress *k, 582 const struct xfrm_encap_tmpl *encap); 583 bool (*is_alive)(const struct km_event *c); 584 }; 585 586 int xfrm_register_km(struct xfrm_mgr *km); 587 int xfrm_unregister_km(struct xfrm_mgr *km); 588 589 struct xfrm_tunnel_skb_cb { 590 union { 591 struct inet_skb_parm h4; 592 struct inet6_skb_parm h6; 593 } header; 594 595 union { 596 struct ip_tunnel *ip4; 597 struct ip6_tnl *ip6; 598 } tunnel; 599 }; 600 601 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0])) 602 603 /* 604 * This structure is used for the duration where packets are being 605 * transformed by IPsec. As soon as the packet leaves IPsec the 606 * area beyond the generic IP part may be overwritten. 607 */ 608 struct xfrm_skb_cb { 609 struct xfrm_tunnel_skb_cb header; 610 611 /* Sequence number for replay protection. */ 612 union { 613 struct { 614 __u32 low; 615 __u32 hi; 616 } output; 617 struct { 618 __be32 low; 619 __be32 hi; 620 } input; 621 } seq; 622 }; 623 624 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) 625 626 /* 627 * This structure is used by the afinfo prepare_input/prepare_output functions 628 * to transmit header information to the mode input/output functions. 629 */ 630 struct xfrm_mode_skb_cb { 631 struct xfrm_tunnel_skb_cb header; 632 633 /* Copied from header for IPv4, always set to zero and DF for IPv6. */ 634 __be16 id; 635 __be16 frag_off; 636 637 /* IP header length (excluding options or extension headers). */ 638 u8 ihl; 639 640 /* TOS for IPv4, class for IPv6. */ 641 u8 tos; 642 643 /* TTL for IPv4, hop limitfor IPv6. */ 644 u8 ttl; 645 646 /* Protocol for IPv4, NH for IPv6. */ 647 u8 protocol; 648 649 /* Option length for IPv4, zero for IPv6. */ 650 u8 optlen; 651 652 /* Used by IPv6 only, zero for IPv4. */ 653 u8 flow_lbl[3]; 654 }; 655 656 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0])) 657 658 /* 659 * This structure is used by the input processing to locate the SPI and 660 * related information. 661 */ 662 struct xfrm_spi_skb_cb { 663 struct xfrm_tunnel_skb_cb header; 664 665 unsigned int daddroff; 666 unsigned int family; 667 __be32 seq; 668 }; 669 670 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0])) 671 672 #ifdef CONFIG_AUDITSYSCALL 673 static inline struct audit_buffer *xfrm_audit_start(const char *op) 674 { 675 struct audit_buffer *audit_buf = NULL; 676 677 if (audit_enabled == AUDIT_OFF) 678 return NULL; 679 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC, 680 AUDIT_MAC_IPSEC_EVENT); 681 if (audit_buf == NULL) 682 return NULL; 683 audit_log_format(audit_buf, "op=%s", op); 684 return audit_buf; 685 } 686 687 static inline void xfrm_audit_helper_usrinfo(bool task_valid, 688 struct audit_buffer *audit_buf) 689 { 690 const unsigned int auid = from_kuid(&init_user_ns, task_valid ? 691 audit_get_loginuid(current) : 692 INVALID_UID); 693 const unsigned int ses = task_valid ? audit_get_sessionid(current) : 694 AUDIT_SID_UNSET; 695 696 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses); 697 audit_log_task_context(audit_buf); 698 } 699 700 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid); 701 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 702 bool task_valid); 703 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid); 704 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid); 705 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 706 struct sk_buff *skb); 707 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb, 708 __be32 net_seq); 709 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family); 710 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi, 711 __be32 net_seq); 712 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb, 713 u8 proto); 714 #else 715 716 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 717 bool task_valid) 718 { 719 } 720 721 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 722 bool task_valid) 723 { 724 } 725 726 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result, 727 bool task_valid) 728 { 729 } 730 731 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result, 732 bool task_valid) 733 { 734 } 735 736 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 737 struct sk_buff *skb) 738 { 739 } 740 741 static inline void xfrm_audit_state_replay(struct xfrm_state *x, 742 struct sk_buff *skb, __be32 net_seq) 743 { 744 } 745 746 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb, 747 u16 family) 748 { 749 } 750 751 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 752 __be32 net_spi, __be32 net_seq) 753 { 754 } 755 756 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x, 757 struct sk_buff *skb, u8 proto) 758 { 759 } 760 #endif /* CONFIG_AUDITSYSCALL */ 761 762 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 763 { 764 if (likely(policy != NULL)) 765 refcount_inc(&policy->refcnt); 766 } 767 768 void xfrm_policy_destroy(struct xfrm_policy *policy); 769 770 static inline void xfrm_pol_put(struct xfrm_policy *policy) 771 { 772 if (refcount_dec_and_test(&policy->refcnt)) 773 xfrm_policy_destroy(policy); 774 } 775 776 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 777 { 778 int i; 779 for (i = npols - 1; i >= 0; --i) 780 xfrm_pol_put(pols[i]); 781 } 782 783 void __xfrm_state_destroy(struct xfrm_state *, bool); 784 785 static inline void __xfrm_state_put(struct xfrm_state *x) 786 { 787 refcount_dec(&x->refcnt); 788 } 789 790 static inline void xfrm_state_put(struct xfrm_state *x) 791 { 792 if (refcount_dec_and_test(&x->refcnt)) 793 __xfrm_state_destroy(x, false); 794 } 795 796 static inline void xfrm_state_put_sync(struct xfrm_state *x) 797 { 798 if (refcount_dec_and_test(&x->refcnt)) 799 __xfrm_state_destroy(x, true); 800 } 801 802 static inline void xfrm_state_hold(struct xfrm_state *x) 803 { 804 refcount_inc(&x->refcnt); 805 } 806 807 static inline bool addr_match(const void *token1, const void *token2, 808 unsigned int prefixlen) 809 { 810 const __be32 *a1 = token1; 811 const __be32 *a2 = token2; 812 unsigned int pdw; 813 unsigned int pbi; 814 815 pdw = prefixlen >> 5; /* num of whole u32 in prefix */ 816 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 817 818 if (pdw) 819 if (memcmp(a1, a2, pdw << 2)) 820 return false; 821 822 if (pbi) { 823 __be32 mask; 824 825 mask = htonl((0xffffffff) << (32 - pbi)); 826 827 if ((a1[pdw] ^ a2[pdw]) & mask) 828 return false; 829 } 830 831 return true; 832 } 833 834 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen) 835 { 836 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */ 837 if (sizeof(long) == 4 && prefixlen == 0) 838 return true; 839 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen))); 840 } 841 842 static __inline__ 843 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli) 844 { 845 __be16 port; 846 switch(fl->flowi_proto) { 847 case IPPROTO_TCP: 848 case IPPROTO_UDP: 849 case IPPROTO_UDPLITE: 850 case IPPROTO_SCTP: 851 port = uli->ports.sport; 852 break; 853 case IPPROTO_ICMP: 854 case IPPROTO_ICMPV6: 855 port = htons(uli->icmpt.type); 856 break; 857 case IPPROTO_MH: 858 port = htons(uli->mht.type); 859 break; 860 case IPPROTO_GRE: 861 port = htons(ntohl(uli->gre_key) >> 16); 862 break; 863 default: 864 port = 0; /*XXX*/ 865 } 866 return port; 867 } 868 869 static __inline__ 870 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli) 871 { 872 __be16 port; 873 switch(fl->flowi_proto) { 874 case IPPROTO_TCP: 875 case IPPROTO_UDP: 876 case IPPROTO_UDPLITE: 877 case IPPROTO_SCTP: 878 port = uli->ports.dport; 879 break; 880 case IPPROTO_ICMP: 881 case IPPROTO_ICMPV6: 882 port = htons(uli->icmpt.code); 883 break; 884 case IPPROTO_GRE: 885 port = htons(ntohl(uli->gre_key) & 0xffff); 886 break; 887 default: 888 port = 0; /*XXX*/ 889 } 890 return port; 891 } 892 893 bool xfrm_selector_match(const struct xfrm_selector *sel, 894 const struct flowi *fl, unsigned short family); 895 896 #ifdef CONFIG_SECURITY_NETWORK_XFRM 897 /* If neither has a context --> match 898 * Otherwise, both must have a context and the sids, doi, alg must match 899 */ 900 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 901 { 902 return ((!s1 && !s2) || 903 (s1 && s2 && 904 (s1->ctx_sid == s2->ctx_sid) && 905 (s1->ctx_doi == s2->ctx_doi) && 906 (s1->ctx_alg == s2->ctx_alg))); 907 } 908 #else 909 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 910 { 911 return true; 912 } 913 #endif 914 915 /* A struct encoding bundle of transformations to apply to some set of flow. 916 * 917 * xdst->child points to the next element of bundle. 918 * dst->xfrm points to an instanse of transformer. 919 * 920 * Due to unfortunate limitations of current routing cache, which we 921 * have no time to fix, it mirrors struct rtable and bound to the same 922 * routing key, including saddr,daddr. However, we can have many of 923 * bundles differing by session id. All the bundles grow from a parent 924 * policy rule. 925 */ 926 struct xfrm_dst { 927 union { 928 struct dst_entry dst; 929 struct rtable rt; 930 struct rt6_info rt6; 931 } u; 932 struct dst_entry *route; 933 struct dst_entry *child; 934 struct dst_entry *path; 935 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; 936 int num_pols, num_xfrms; 937 u32 xfrm_genid; 938 u32 policy_genid; 939 u32 route_mtu_cached; 940 u32 child_mtu_cached; 941 u32 route_cookie; 942 u32 path_cookie; 943 }; 944 945 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst) 946 { 947 #ifdef CONFIG_XFRM 948 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) { 949 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst; 950 951 return xdst->path; 952 } 953 #endif 954 return (struct dst_entry *) dst; 955 } 956 957 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst) 958 { 959 #ifdef CONFIG_XFRM 960 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) { 961 struct xfrm_dst *xdst = (struct xfrm_dst *) dst; 962 return xdst->child; 963 } 964 #endif 965 return NULL; 966 } 967 968 #ifdef CONFIG_XFRM 969 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child) 970 { 971 xdst->child = child; 972 } 973 974 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 975 { 976 xfrm_pols_put(xdst->pols, xdst->num_pols); 977 dst_release(xdst->route); 978 if (likely(xdst->u.dst.xfrm)) 979 xfrm_state_put(xdst->u.dst.xfrm); 980 } 981 #endif 982 983 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 984 985 struct xfrm_if_parms { 986 int link; /* ifindex of underlying L2 interface */ 987 u32 if_id; /* interface identifyer */ 988 }; 989 990 struct xfrm_if { 991 struct xfrm_if __rcu *next; /* next interface in list */ 992 struct net_device *dev; /* virtual device associated with interface */ 993 struct net *net; /* netns for packet i/o */ 994 struct xfrm_if_parms p; /* interface parms */ 995 996 struct gro_cells gro_cells; 997 }; 998 999 struct xfrm_offload { 1000 /* Output sequence number for replay protection on offloading. */ 1001 struct { 1002 __u32 low; 1003 __u32 hi; 1004 } seq; 1005 1006 __u32 flags; 1007 #define SA_DELETE_REQ 1 1008 #define CRYPTO_DONE 2 1009 #define CRYPTO_NEXT_DONE 4 1010 #define CRYPTO_FALLBACK 8 1011 #define XFRM_GSO_SEGMENT 16 1012 #define XFRM_GRO 32 1013 /* 64 is free */ 1014 #define XFRM_DEV_RESUME 128 1015 #define XFRM_XMIT 256 1016 1017 __u32 status; 1018 #define CRYPTO_SUCCESS 1 1019 #define CRYPTO_GENERIC_ERROR 2 1020 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4 1021 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8 1022 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16 1023 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32 1024 #define CRYPTO_INVALID_PACKET_SYNTAX 64 1025 #define CRYPTO_INVALID_PROTOCOL 128 1026 1027 __u8 proto; 1028 __u8 inner_ipproto; 1029 }; 1030 1031 struct sec_path { 1032 int len; 1033 int olen; 1034 1035 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 1036 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH]; 1037 }; 1038 1039 struct sec_path *secpath_set(struct sk_buff *skb); 1040 1041 static inline void 1042 secpath_reset(struct sk_buff *skb) 1043 { 1044 #ifdef CONFIG_XFRM 1045 skb_ext_del(skb, SKB_EXT_SEC_PATH); 1046 #endif 1047 } 1048 1049 static inline int 1050 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family) 1051 { 1052 switch (family) { 1053 case AF_INET: 1054 return addr->a4 == 0; 1055 case AF_INET6: 1056 return ipv6_addr_any(&addr->in6); 1057 } 1058 return 0; 1059 } 1060 1061 static inline int 1062 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1063 { 1064 return (tmpl->saddr.a4 && 1065 tmpl->saddr.a4 != x->props.saddr.a4); 1066 } 1067 1068 static inline int 1069 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1070 { 1071 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 1072 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 1073 } 1074 1075 static inline int 1076 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family) 1077 { 1078 switch (family) { 1079 case AF_INET: 1080 return __xfrm4_state_addr_cmp(tmpl, x); 1081 case AF_INET6: 1082 return __xfrm6_state_addr_cmp(tmpl, x); 1083 } 1084 return !0; 1085 } 1086 1087 #ifdef CONFIG_XFRM 1088 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, 1089 unsigned short family); 1090 1091 static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb, 1092 int dir) 1093 { 1094 if (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) 1095 return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT; 1096 1097 return false; 1098 } 1099 1100 static inline int __xfrm_policy_check2(struct sock *sk, int dir, 1101 struct sk_buff *skb, 1102 unsigned int family, int reverse) 1103 { 1104 struct net *net = dev_net(skb->dev); 1105 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); 1106 1107 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 1108 return __xfrm_policy_check(sk, ndir, skb, family); 1109 1110 return __xfrm_check_nopolicy(net, skb, dir) || 1111 (skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY)) || 1112 __xfrm_policy_check(sk, ndir, skb, family); 1113 } 1114 1115 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1116 { 1117 return __xfrm_policy_check2(sk, dir, skb, family, 0); 1118 } 1119 1120 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1121 { 1122 return xfrm_policy_check(sk, dir, skb, AF_INET); 1123 } 1124 1125 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1126 { 1127 return xfrm_policy_check(sk, dir, skb, AF_INET6); 1128 } 1129 1130 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1131 struct sk_buff *skb) 1132 { 1133 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); 1134 } 1135 1136 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1137 struct sk_buff *skb) 1138 { 1139 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); 1140 } 1141 1142 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1143 unsigned int family, int reverse); 1144 1145 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1146 unsigned int family) 1147 { 1148 return __xfrm_decode_session(skb, fl, family, 0); 1149 } 1150 1151 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1152 struct flowi *fl, 1153 unsigned int family) 1154 { 1155 return __xfrm_decode_session(skb, fl, family, 1); 1156 } 1157 1158 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 1159 1160 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 1161 { 1162 struct net *net = dev_net(skb->dev); 1163 1164 if (!net->xfrm.policy_count[XFRM_POLICY_OUT] && 1165 net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT) 1166 return true; 1167 1168 return (skb_dst(skb)->flags & DST_NOXFRM) || 1169 __xfrm_route_forward(skb, family); 1170 } 1171 1172 static inline int xfrm4_route_forward(struct sk_buff *skb) 1173 { 1174 return xfrm_route_forward(skb, AF_INET); 1175 } 1176 1177 static inline int xfrm6_route_forward(struct sk_buff *skb) 1178 { 1179 return xfrm_route_forward(skb, AF_INET6); 1180 } 1181 1182 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk); 1183 1184 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) 1185 { 1186 sk->sk_policy[0] = NULL; 1187 sk->sk_policy[1] = NULL; 1188 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1])) 1189 return __xfrm_sk_clone_policy(sk, osk); 1190 return 0; 1191 } 1192 1193 int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 1194 1195 static inline void xfrm_sk_free_policy(struct sock *sk) 1196 { 1197 struct xfrm_policy *pol; 1198 1199 pol = rcu_dereference_protected(sk->sk_policy[0], 1); 1200 if (unlikely(pol != NULL)) { 1201 xfrm_policy_delete(pol, XFRM_POLICY_MAX); 1202 sk->sk_policy[0] = NULL; 1203 } 1204 pol = rcu_dereference_protected(sk->sk_policy[1], 1); 1205 if (unlikely(pol != NULL)) { 1206 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1); 1207 sk->sk_policy[1] = NULL; 1208 } 1209 } 1210 1211 #else 1212 1213 static inline void xfrm_sk_free_policy(struct sock *sk) {} 1214 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; } 1215 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 1216 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 1217 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1218 { 1219 return 1; 1220 } 1221 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1222 { 1223 return 1; 1224 } 1225 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1226 { 1227 return 1; 1228 } 1229 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1230 struct flowi *fl, 1231 unsigned int family) 1232 { 1233 return -ENOSYS; 1234 } 1235 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1236 struct sk_buff *skb) 1237 { 1238 return 1; 1239 } 1240 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1241 struct sk_buff *skb) 1242 { 1243 return 1; 1244 } 1245 #endif 1246 1247 static __inline__ 1248 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family) 1249 { 1250 switch (family){ 1251 case AF_INET: 1252 return (xfrm_address_t *)&fl->u.ip4.daddr; 1253 case AF_INET6: 1254 return (xfrm_address_t *)&fl->u.ip6.daddr; 1255 } 1256 return NULL; 1257 } 1258 1259 static __inline__ 1260 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family) 1261 { 1262 switch (family){ 1263 case AF_INET: 1264 return (xfrm_address_t *)&fl->u.ip4.saddr; 1265 case AF_INET6: 1266 return (xfrm_address_t *)&fl->u.ip6.saddr; 1267 } 1268 return NULL; 1269 } 1270 1271 static __inline__ 1272 void xfrm_flowi_addr_get(const struct flowi *fl, 1273 xfrm_address_t *saddr, xfrm_address_t *daddr, 1274 unsigned short family) 1275 { 1276 switch(family) { 1277 case AF_INET: 1278 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4)); 1279 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4)); 1280 break; 1281 case AF_INET6: 1282 saddr->in6 = fl->u.ip6.saddr; 1283 daddr->in6 = fl->u.ip6.daddr; 1284 break; 1285 } 1286 } 1287 1288 static __inline__ int 1289 __xfrm4_state_addr_check(const struct xfrm_state *x, 1290 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1291 { 1292 if (daddr->a4 == x->id.daddr.a4 && 1293 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 1294 return 1; 1295 return 0; 1296 } 1297 1298 static __inline__ int 1299 __xfrm6_state_addr_check(const struct xfrm_state *x, 1300 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1301 { 1302 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 1303 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) || 1304 ipv6_addr_any((struct in6_addr *)saddr) || 1305 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 1306 return 1; 1307 return 0; 1308 } 1309 1310 static __inline__ int 1311 xfrm_state_addr_check(const struct xfrm_state *x, 1312 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1313 unsigned short family) 1314 { 1315 switch (family) { 1316 case AF_INET: 1317 return __xfrm4_state_addr_check(x, daddr, saddr); 1318 case AF_INET6: 1319 return __xfrm6_state_addr_check(x, daddr, saddr); 1320 } 1321 return 0; 1322 } 1323 1324 static __inline__ int 1325 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl, 1326 unsigned short family) 1327 { 1328 switch (family) { 1329 case AF_INET: 1330 return __xfrm4_state_addr_check(x, 1331 (const xfrm_address_t *)&fl->u.ip4.daddr, 1332 (const xfrm_address_t *)&fl->u.ip4.saddr); 1333 case AF_INET6: 1334 return __xfrm6_state_addr_check(x, 1335 (const xfrm_address_t *)&fl->u.ip6.daddr, 1336 (const xfrm_address_t *)&fl->u.ip6.saddr); 1337 } 1338 return 0; 1339 } 1340 1341 static inline int xfrm_state_kern(const struct xfrm_state *x) 1342 { 1343 return atomic_read(&x->tunnel_users); 1344 } 1345 1346 static inline bool xfrm_id_proto_valid(u8 proto) 1347 { 1348 switch (proto) { 1349 case IPPROTO_AH: 1350 case IPPROTO_ESP: 1351 case IPPROTO_COMP: 1352 #if IS_ENABLED(CONFIG_IPV6) 1353 case IPPROTO_ROUTING: 1354 case IPPROTO_DSTOPTS: 1355 #endif 1356 return true; 1357 default: 1358 return false; 1359 } 1360 } 1361 1362 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */ 1363 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 1364 { 1365 return (!userproto || proto == userproto || 1366 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 1367 proto == IPPROTO_ESP || 1368 proto == IPPROTO_COMP))); 1369 } 1370 1371 /* 1372 * xfrm algorithm information 1373 */ 1374 struct xfrm_algo_aead_info { 1375 char *geniv; 1376 u16 icv_truncbits; 1377 }; 1378 1379 struct xfrm_algo_auth_info { 1380 u16 icv_truncbits; 1381 u16 icv_fullbits; 1382 }; 1383 1384 struct xfrm_algo_encr_info { 1385 char *geniv; 1386 u16 blockbits; 1387 u16 defkeybits; 1388 }; 1389 1390 struct xfrm_algo_comp_info { 1391 u16 threshold; 1392 }; 1393 1394 struct xfrm_algo_desc { 1395 char *name; 1396 char *compat; 1397 u8 available:1; 1398 u8 pfkey_supported:1; 1399 union { 1400 struct xfrm_algo_aead_info aead; 1401 struct xfrm_algo_auth_info auth; 1402 struct xfrm_algo_encr_info encr; 1403 struct xfrm_algo_comp_info comp; 1404 } uinfo; 1405 struct sadb_alg desc; 1406 }; 1407 1408 /* XFRM protocol handlers. */ 1409 struct xfrm4_protocol { 1410 int (*handler)(struct sk_buff *skb); 1411 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1412 int encap_type); 1413 int (*cb_handler)(struct sk_buff *skb, int err); 1414 int (*err_handler)(struct sk_buff *skb, u32 info); 1415 1416 struct xfrm4_protocol __rcu *next; 1417 int priority; 1418 }; 1419 1420 struct xfrm6_protocol { 1421 int (*handler)(struct sk_buff *skb); 1422 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1423 int encap_type); 1424 int (*cb_handler)(struct sk_buff *skb, int err); 1425 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1426 u8 type, u8 code, int offset, __be32 info); 1427 1428 struct xfrm6_protocol __rcu *next; 1429 int priority; 1430 }; 1431 1432 /* XFRM tunnel handlers. */ 1433 struct xfrm_tunnel { 1434 int (*handler)(struct sk_buff *skb); 1435 int (*cb_handler)(struct sk_buff *skb, int err); 1436 int (*err_handler)(struct sk_buff *skb, u32 info); 1437 1438 struct xfrm_tunnel __rcu *next; 1439 int priority; 1440 }; 1441 1442 struct xfrm6_tunnel { 1443 int (*handler)(struct sk_buff *skb); 1444 int (*cb_handler)(struct sk_buff *skb, int err); 1445 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1446 u8 type, u8 code, int offset, __be32 info); 1447 struct xfrm6_tunnel __rcu *next; 1448 int priority; 1449 }; 1450 1451 void xfrm_init(void); 1452 void xfrm4_init(void); 1453 int xfrm_state_init(struct net *net); 1454 void xfrm_state_fini(struct net *net); 1455 void xfrm4_state_init(void); 1456 void xfrm4_protocol_init(void); 1457 #ifdef CONFIG_XFRM 1458 int xfrm6_init(void); 1459 void xfrm6_fini(void); 1460 int xfrm6_state_init(void); 1461 void xfrm6_state_fini(void); 1462 int xfrm6_protocol_init(void); 1463 void xfrm6_protocol_fini(void); 1464 #else 1465 static inline int xfrm6_init(void) 1466 { 1467 return 0; 1468 } 1469 static inline void xfrm6_fini(void) 1470 { 1471 ; 1472 } 1473 #endif 1474 1475 #ifdef CONFIG_XFRM_STATISTICS 1476 int xfrm_proc_init(struct net *net); 1477 void xfrm_proc_fini(struct net *net); 1478 #endif 1479 1480 int xfrm_sysctl_init(struct net *net); 1481 #ifdef CONFIG_SYSCTL 1482 void xfrm_sysctl_fini(struct net *net); 1483 #else 1484 static inline void xfrm_sysctl_fini(struct net *net) 1485 { 1486 } 1487 #endif 1488 1489 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 1490 struct xfrm_address_filter *filter); 1491 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1492 int (*func)(struct xfrm_state *, int, void*), void *); 1493 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net); 1494 struct xfrm_state *xfrm_state_alloc(struct net *net); 1495 void xfrm_state_free(struct xfrm_state *x); 1496 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr, 1497 const xfrm_address_t *saddr, 1498 const struct flowi *fl, 1499 struct xfrm_tmpl *tmpl, 1500 struct xfrm_policy *pol, int *err, 1501 unsigned short family, u32 if_id); 1502 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id, 1503 xfrm_address_t *daddr, 1504 xfrm_address_t *saddr, 1505 unsigned short family, 1506 u8 mode, u8 proto, u32 reqid); 1507 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1508 unsigned short family); 1509 int xfrm_state_check_expire(struct xfrm_state *x); 1510 void xfrm_state_insert(struct xfrm_state *x); 1511 int xfrm_state_add(struct xfrm_state *x); 1512 int xfrm_state_update(struct xfrm_state *x); 1513 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark, 1514 const xfrm_address_t *daddr, __be32 spi, 1515 u8 proto, unsigned short family); 1516 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1517 const xfrm_address_t *daddr, 1518 const xfrm_address_t *saddr, 1519 u8 proto, 1520 unsigned short family); 1521 #ifdef CONFIG_XFRM_SUB_POLICY 1522 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1523 unsigned short family); 1524 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1525 unsigned short family); 1526 #else 1527 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s, 1528 int n, unsigned short family) 1529 { 1530 } 1531 1532 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s, 1533 int n, unsigned short family) 1534 { 1535 } 1536 #endif 1537 1538 struct xfrmk_sadinfo { 1539 u32 sadhcnt; /* current hash bkts */ 1540 u32 sadhmcnt; /* max allowed hash bkts */ 1541 u32 sadcnt; /* current running count */ 1542 }; 1543 1544 struct xfrmk_spdinfo { 1545 u32 incnt; 1546 u32 outcnt; 1547 u32 fwdcnt; 1548 u32 inscnt; 1549 u32 outscnt; 1550 u32 fwdscnt; 1551 u32 spdhcnt; 1552 u32 spdhmcnt; 1553 }; 1554 1555 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1556 int xfrm_state_delete(struct xfrm_state *x); 1557 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync); 1558 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid); 1559 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); 1560 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); 1561 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq); 1562 int xfrm_init_replay(struct xfrm_state *x); 1563 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu); 1564 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload); 1565 int xfrm_init_state(struct xfrm_state *x); 1566 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type); 1567 int xfrm_input_resume(struct sk_buff *skb, int nexthdr); 1568 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb, 1569 int (*finish)(struct net *, struct sock *, 1570 struct sk_buff *)); 1571 int xfrm_trans_queue(struct sk_buff *skb, 1572 int (*finish)(struct net *, struct sock *, 1573 struct sk_buff *)); 1574 int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err); 1575 int xfrm_output(struct sock *sk, struct sk_buff *skb); 1576 1577 #if IS_ENABLED(CONFIG_NET_PKTGEN) 1578 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb); 1579 #endif 1580 1581 void xfrm_local_error(struct sk_buff *skb, int mtu); 1582 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1583 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1584 int encap_type); 1585 int xfrm4_transport_finish(struct sk_buff *skb, int async); 1586 int xfrm4_rcv(struct sk_buff *skb); 1587 1588 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1589 { 1590 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL; 1591 XFRM_SPI_SKB_CB(skb)->family = AF_INET; 1592 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); 1593 return xfrm_input(skb, nexthdr, spi, 0); 1594 } 1595 1596 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1597 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol); 1598 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol); 1599 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1600 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1601 void xfrm4_local_error(struct sk_buff *skb, u32 mtu); 1602 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1603 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi, 1604 struct ip6_tnl *t); 1605 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1606 int encap_type); 1607 int xfrm6_transport_finish(struct sk_buff *skb, int async); 1608 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t); 1609 int xfrm6_rcv(struct sk_buff *skb); 1610 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1611 xfrm_address_t *saddr, u8 proto); 1612 void xfrm6_local_error(struct sk_buff *skb, u32 mtu); 1613 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol); 1614 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol); 1615 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1616 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1617 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr); 1618 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr); 1619 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1620 1621 #ifdef CONFIG_XFRM 1622 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu); 1623 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1624 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1625 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, 1626 int optlen); 1627 #else 1628 static inline int xfrm_user_policy(struct sock *sk, int optname, 1629 sockptr_t optval, int optlen) 1630 { 1631 return -ENOPROTOOPT; 1632 } 1633 #endif 1634 1635 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif, 1636 const xfrm_address_t *saddr, 1637 const xfrm_address_t *daddr, 1638 int family, u32 mark); 1639 1640 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); 1641 1642 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); 1643 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, 1644 int (*func)(struct xfrm_policy *, int, int, void*), 1645 void *); 1646 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net); 1647 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1648 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, 1649 const struct xfrm_mark *mark, 1650 u32 if_id, u8 type, int dir, 1651 struct xfrm_selector *sel, 1652 struct xfrm_sec_ctx *ctx, int delete, 1653 int *err); 1654 struct xfrm_policy *xfrm_policy_byid(struct net *net, 1655 const struct xfrm_mark *mark, u32 if_id, 1656 u8 type, int dir, u32 id, int delete, 1657 int *err); 1658 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid); 1659 void xfrm_policy_hash_rebuild(struct net *net); 1660 u32 xfrm_get_acqseq(void); 1661 int verify_spi_info(u8 proto, u32 min, u32 max); 1662 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 1663 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, 1664 u8 mode, u32 reqid, u32 if_id, u8 proto, 1665 const xfrm_address_t *daddr, 1666 const xfrm_address_t *saddr, int create, 1667 unsigned short family); 1668 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1669 1670 #ifdef CONFIG_XFRM_MIGRATE 1671 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1672 const struct xfrm_migrate *m, int num_bundles, 1673 const struct xfrm_kmaddress *k, 1674 const struct xfrm_encap_tmpl *encap); 1675 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net, 1676 u32 if_id); 1677 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 1678 struct xfrm_migrate *m, 1679 struct xfrm_encap_tmpl *encap); 1680 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1681 struct xfrm_migrate *m, int num_bundles, 1682 struct xfrm_kmaddress *k, struct net *net, 1683 struct xfrm_encap_tmpl *encap, u32 if_id); 1684 #endif 1685 1686 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1687 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid); 1688 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, 1689 xfrm_address_t *addr); 1690 1691 void xfrm_input_init(void); 1692 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1693 1694 void xfrm_probe_algs(void); 1695 int xfrm_count_pfkey_auth_supported(void); 1696 int xfrm_count_pfkey_enc_supported(void); 1697 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1698 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1699 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1700 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1701 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1702 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe); 1703 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe); 1704 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe); 1705 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, 1706 int probe); 1707 1708 static inline bool xfrm6_addr_equal(const xfrm_address_t *a, 1709 const xfrm_address_t *b) 1710 { 1711 return ipv6_addr_equal((const struct in6_addr *)a, 1712 (const struct in6_addr *)b); 1713 } 1714 1715 static inline bool xfrm_addr_equal(const xfrm_address_t *a, 1716 const xfrm_address_t *b, 1717 sa_family_t family) 1718 { 1719 switch (family) { 1720 default: 1721 case AF_INET: 1722 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0; 1723 case AF_INET6: 1724 return xfrm6_addr_equal(a, b); 1725 } 1726 } 1727 1728 static inline int xfrm_policy_id2dir(u32 index) 1729 { 1730 return index & 7; 1731 } 1732 1733 #ifdef CONFIG_XFRM 1734 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq); 1735 int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq); 1736 void xfrm_replay_notify(struct xfrm_state *x, int event); 1737 int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb); 1738 int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq); 1739 1740 static inline int xfrm_aevent_is_on(struct net *net) 1741 { 1742 struct sock *nlsk; 1743 int ret = 0; 1744 1745 rcu_read_lock(); 1746 nlsk = rcu_dereference(net->xfrm.nlsk); 1747 if (nlsk) 1748 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1749 rcu_read_unlock(); 1750 return ret; 1751 } 1752 1753 static inline int xfrm_acquire_is_on(struct net *net) 1754 { 1755 struct sock *nlsk; 1756 int ret = 0; 1757 1758 rcu_read_lock(); 1759 nlsk = rcu_dereference(net->xfrm.nlsk); 1760 if (nlsk) 1761 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE); 1762 rcu_read_unlock(); 1763 1764 return ret; 1765 } 1766 #endif 1767 1768 static inline unsigned int aead_len(struct xfrm_algo_aead *alg) 1769 { 1770 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1771 } 1772 1773 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg) 1774 { 1775 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1776 } 1777 1778 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg) 1779 { 1780 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1781 } 1782 1783 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn) 1784 { 1785 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32); 1786 } 1787 1788 #ifdef CONFIG_XFRM_MIGRATE 1789 static inline int xfrm_replay_clone(struct xfrm_state *x, 1790 struct xfrm_state *orig) 1791 { 1792 1793 x->replay_esn = kmemdup(orig->replay_esn, 1794 xfrm_replay_state_esn_len(orig->replay_esn), 1795 GFP_KERNEL); 1796 if (!x->replay_esn) 1797 return -ENOMEM; 1798 x->preplay_esn = kmemdup(orig->preplay_esn, 1799 xfrm_replay_state_esn_len(orig->preplay_esn), 1800 GFP_KERNEL); 1801 if (!x->preplay_esn) 1802 return -ENOMEM; 1803 1804 return 0; 1805 } 1806 1807 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig) 1808 { 1809 return kmemdup(orig, aead_len(orig), GFP_KERNEL); 1810 } 1811 1812 1813 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1814 { 1815 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); 1816 } 1817 1818 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig) 1819 { 1820 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL); 1821 } 1822 1823 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1824 { 1825 int i; 1826 for (i = 0; i < n; i++) 1827 xfrm_state_put(*(states + i)); 1828 } 1829 1830 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1831 { 1832 int i; 1833 for (i = 0; i < n; i++) 1834 xfrm_state_delete(*(states + i)); 1835 } 1836 #endif 1837 1838 #ifdef CONFIG_XFRM 1839 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) 1840 { 1841 struct sec_path *sp = skb_sec_path(skb); 1842 1843 return sp->xvec[sp->len - 1]; 1844 } 1845 #endif 1846 1847 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb) 1848 { 1849 #ifdef CONFIG_XFRM 1850 struct sec_path *sp = skb_sec_path(skb); 1851 1852 if (!sp || !sp->olen || sp->len != sp->olen) 1853 return NULL; 1854 1855 return &sp->ovec[sp->olen - 1]; 1856 #else 1857 return NULL; 1858 #endif 1859 } 1860 1861 void __init xfrm_dev_init(void); 1862 1863 #ifdef CONFIG_XFRM_OFFLOAD 1864 void xfrm_dev_resume(struct sk_buff *skb); 1865 void xfrm_dev_backlog(struct softnet_data *sd); 1866 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again); 1867 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, 1868 struct xfrm_user_offload *xuo); 1869 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x); 1870 1871 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 1872 { 1873 struct xfrm_dev_offload *xso = &x->xso; 1874 1875 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn) 1876 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x); 1877 } 1878 1879 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 1880 { 1881 struct xfrm_state *x = dst->xfrm; 1882 struct xfrm_dst *xdst; 1883 1884 if (!x || !x->type_offload) 1885 return false; 1886 1887 xdst = (struct xfrm_dst *) dst; 1888 if (!x->xso.offload_handle && !xdst->child->xfrm) 1889 return true; 1890 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) && 1891 !xdst->child->xfrm) 1892 return true; 1893 1894 return false; 1895 } 1896 1897 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 1898 { 1899 struct xfrm_dev_offload *xso = &x->xso; 1900 1901 if (xso->dev) 1902 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x); 1903 } 1904 1905 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1906 { 1907 struct xfrm_dev_offload *xso = &x->xso; 1908 struct net_device *dev = xso->dev; 1909 1910 if (dev && dev->xfrmdev_ops) { 1911 if (dev->xfrmdev_ops->xdo_dev_state_free) 1912 dev->xfrmdev_ops->xdo_dev_state_free(x); 1913 xso->dev = NULL; 1914 dev_put_track(dev, &xso->dev_tracker); 1915 } 1916 } 1917 #else 1918 static inline void xfrm_dev_resume(struct sk_buff *skb) 1919 { 1920 } 1921 1922 static inline void xfrm_dev_backlog(struct softnet_data *sd) 1923 { 1924 } 1925 1926 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again) 1927 { 1928 return skb; 1929 } 1930 1931 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo) 1932 { 1933 return 0; 1934 } 1935 1936 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 1937 { 1938 } 1939 1940 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1941 { 1942 } 1943 1944 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) 1945 { 1946 return false; 1947 } 1948 1949 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 1950 { 1951 } 1952 1953 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 1954 { 1955 return false; 1956 } 1957 #endif 1958 1959 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) 1960 { 1961 if (attrs[XFRMA_MARK]) 1962 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark)); 1963 else 1964 m->v = m->m = 0; 1965 1966 return m->v & m->m; 1967 } 1968 1969 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m) 1970 { 1971 int ret = 0; 1972 1973 if (m->m | m->v) 1974 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); 1975 return ret; 1976 } 1977 1978 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x) 1979 { 1980 struct xfrm_mark *m = &x->props.smark; 1981 1982 return (m->v & m->m) | (mark & ~m->m); 1983 } 1984 1985 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id) 1986 { 1987 int ret = 0; 1988 1989 if (if_id) 1990 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id); 1991 return ret; 1992 } 1993 1994 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x, 1995 unsigned int family) 1996 { 1997 bool tunnel = false; 1998 1999 switch(family) { 2000 case AF_INET: 2001 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) 2002 tunnel = true; 2003 break; 2004 case AF_INET6: 2005 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) 2006 tunnel = true; 2007 break; 2008 } 2009 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL)) 2010 return -EINVAL; 2011 2012 return 0; 2013 } 2014 2015 extern const int xfrm_msg_min[XFRM_NR_MSGTYPES]; 2016 extern const struct nla_policy xfrma_policy[XFRMA_MAX+1]; 2017 2018 struct xfrm_translator { 2019 /* Allocate frag_list and put compat translation there */ 2020 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src); 2021 2022 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */ 2023 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh, 2024 int maxtype, const struct nla_policy *policy, 2025 struct netlink_ext_ack *extack); 2026 2027 /* Translate 32-bit user_policy from sockptr */ 2028 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen); 2029 2030 struct module *owner; 2031 }; 2032 2033 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT) 2034 extern int xfrm_register_translator(struct xfrm_translator *xtr); 2035 extern int xfrm_unregister_translator(struct xfrm_translator *xtr); 2036 extern struct xfrm_translator *xfrm_get_translator(void); 2037 extern void xfrm_put_translator(struct xfrm_translator *xtr); 2038 #else 2039 static inline struct xfrm_translator *xfrm_get_translator(void) 2040 { 2041 return NULL; 2042 } 2043 static inline void xfrm_put_translator(struct xfrm_translator *xtr) 2044 { 2045 } 2046 #endif 2047 2048 #if IS_ENABLED(CONFIG_IPV6) 2049 static inline bool xfrm6_local_dontfrag(const struct sock *sk) 2050 { 2051 int proto; 2052 2053 if (!sk || sk->sk_family != AF_INET6) 2054 return false; 2055 2056 proto = sk->sk_protocol; 2057 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW) 2058 return inet6_sk(sk)->dontfrag; 2059 2060 return false; 2061 } 2062 #endif 2063 #endif /* _NET_XFRM_H */ 2064