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 XFRM_DEV_OFFLOAD_FWD, 133 }; 134 135 enum { 136 XFRM_DEV_OFFLOAD_UNSPECIFIED, 137 XFRM_DEV_OFFLOAD_CRYPTO, 138 XFRM_DEV_OFFLOAD_PACKET, 139 }; 140 141 enum { 142 XFRM_DEV_OFFLOAD_FLAG_ACQ = 1, 143 }; 144 145 struct xfrm_dev_offload { 146 struct net_device *dev; 147 netdevice_tracker dev_tracker; 148 struct net_device *real_dev; 149 unsigned long offload_handle; 150 u8 dir : 2; 151 u8 type : 2; 152 u8 flags : 2; 153 }; 154 155 struct xfrm_mode { 156 u8 encap; 157 u8 family; 158 u8 flags; 159 }; 160 161 /* Flags for xfrm_mode. */ 162 enum { 163 XFRM_MODE_FLAG_TUNNEL = 1, 164 }; 165 166 enum xfrm_replay_mode { 167 XFRM_REPLAY_MODE_LEGACY, 168 XFRM_REPLAY_MODE_BMP, 169 XFRM_REPLAY_MODE_ESN, 170 }; 171 172 /* Full description of state of transformer. */ 173 struct xfrm_state { 174 possible_net_t xs_net; 175 union { 176 struct hlist_node gclist; 177 struct hlist_node bydst; 178 }; 179 struct hlist_node bysrc; 180 struct hlist_node byspi; 181 struct hlist_node byseq; 182 183 refcount_t refcnt; 184 spinlock_t lock; 185 186 struct xfrm_id id; 187 struct xfrm_selector sel; 188 struct xfrm_mark mark; 189 u32 if_id; 190 u32 tfcpad; 191 192 u32 genid; 193 194 /* Key manager bits */ 195 struct xfrm_state_walk km; 196 197 /* Parameters of this state. */ 198 struct { 199 u32 reqid; 200 u8 mode; 201 u8 replay_window; 202 u8 aalgo, ealgo, calgo; 203 u8 flags; 204 u16 family; 205 xfrm_address_t saddr; 206 int header_len; 207 int trailer_len; 208 u32 extra_flags; 209 struct xfrm_mark smark; 210 } props; 211 212 struct xfrm_lifetime_cfg lft; 213 214 /* Data for transformer */ 215 struct xfrm_algo_auth *aalg; 216 struct xfrm_algo *ealg; 217 struct xfrm_algo *calg; 218 struct xfrm_algo_aead *aead; 219 const char *geniv; 220 221 /* mapping change rate limiting */ 222 __be16 new_mapping_sport; 223 u32 new_mapping; /* seconds */ 224 u32 mapping_maxage; /* seconds for input SA */ 225 226 /* Data for encapsulator */ 227 struct xfrm_encap_tmpl *encap; 228 struct sock __rcu *encap_sk; 229 230 /* Data for care-of address */ 231 xfrm_address_t *coaddr; 232 233 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 234 struct xfrm_state *tunnel; 235 236 /* If a tunnel, number of users + 1 */ 237 atomic_t tunnel_users; 238 239 /* State for replay detection */ 240 struct xfrm_replay_state replay; 241 struct xfrm_replay_state_esn *replay_esn; 242 243 /* Replay detection state at the time we sent the last notification */ 244 struct xfrm_replay_state preplay; 245 struct xfrm_replay_state_esn *preplay_esn; 246 247 /* replay detection mode */ 248 enum xfrm_replay_mode repl_mode; 249 /* internal flag that only holds state for delayed aevent at the 250 * moment 251 */ 252 u32 xflags; 253 254 /* Replay detection notification settings */ 255 u32 replay_maxage; 256 u32 replay_maxdiff; 257 258 /* Replay detection notification timer */ 259 struct timer_list rtimer; 260 261 /* Statistics */ 262 struct xfrm_stats stats; 263 264 struct xfrm_lifetime_cur curlft; 265 struct hrtimer mtimer; 266 267 struct xfrm_dev_offload xso; 268 269 /* used to fix curlft->add_time when changing date */ 270 long saved_tmo; 271 272 /* Last used time */ 273 time64_t lastused; 274 275 struct page_frag xfrag; 276 277 /* Reference to data common to all the instances of this 278 * transformer. */ 279 const struct xfrm_type *type; 280 struct xfrm_mode inner_mode; 281 struct xfrm_mode inner_mode_iaf; 282 struct xfrm_mode outer_mode; 283 284 const struct xfrm_type_offload *type_offload; 285 286 /* Security context */ 287 struct xfrm_sec_ctx *security; 288 289 /* Private data of this transformer, format is opaque, 290 * interpreted by xfrm_type methods. */ 291 void *data; 292 }; 293 294 static inline struct net *xs_net(struct xfrm_state *x) 295 { 296 return read_pnet(&x->xs_net); 297 } 298 299 /* xflags - make enum if more show up */ 300 #define XFRM_TIME_DEFER 1 301 #define XFRM_SOFT_EXPIRE 2 302 303 enum { 304 XFRM_STATE_VOID, 305 XFRM_STATE_ACQ, 306 XFRM_STATE_VALID, 307 XFRM_STATE_ERROR, 308 XFRM_STATE_EXPIRED, 309 XFRM_STATE_DEAD 310 }; 311 312 /* callback structure passed from either netlink or pfkey */ 313 struct km_event { 314 union { 315 u32 hard; 316 u32 proto; 317 u32 byid; 318 u32 aevent; 319 u32 type; 320 } data; 321 322 u32 seq; 323 u32 portid; 324 u32 event; 325 struct net *net; 326 }; 327 328 struct xfrm_if_decode_session_result { 329 struct net *net; 330 u32 if_id; 331 }; 332 333 struct xfrm_if_cb { 334 bool (*decode_session)(struct sk_buff *skb, 335 unsigned short family, 336 struct xfrm_if_decode_session_result *res); 337 }; 338 339 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb); 340 void xfrm_if_unregister_cb(void); 341 342 struct net_device; 343 struct xfrm_type; 344 struct xfrm_dst; 345 struct xfrm_policy_afinfo { 346 struct dst_ops *dst_ops; 347 struct dst_entry *(*dst_lookup)(struct net *net, 348 int tos, int oif, 349 const xfrm_address_t *saddr, 350 const xfrm_address_t *daddr, 351 u32 mark); 352 int (*get_saddr)(struct net *net, int oif, 353 xfrm_address_t *saddr, 354 xfrm_address_t *daddr, 355 u32 mark); 356 int (*fill_dst)(struct xfrm_dst *xdst, 357 struct net_device *dev, 358 const struct flowi *fl); 359 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig); 360 }; 361 362 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family); 363 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo); 364 void km_policy_notify(struct xfrm_policy *xp, int dir, 365 const struct km_event *c); 366 void km_state_notify(struct xfrm_state *x, const struct km_event *c); 367 368 struct xfrm_tmpl; 369 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, 370 struct xfrm_policy *pol); 371 void km_state_expired(struct xfrm_state *x, int hard, u32 portid); 372 int __xfrm_state_delete(struct xfrm_state *x); 373 374 struct xfrm_state_afinfo { 375 u8 family; 376 u8 proto; 377 378 const struct xfrm_type_offload *type_offload_esp; 379 380 const struct xfrm_type *type_esp; 381 const struct xfrm_type *type_ipip; 382 const struct xfrm_type *type_ipip6; 383 const struct xfrm_type *type_comp; 384 const struct xfrm_type *type_ah; 385 const struct xfrm_type *type_routing; 386 const struct xfrm_type *type_dstopts; 387 388 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb); 389 int (*transport_finish)(struct sk_buff *skb, 390 int async); 391 void (*local_error)(struct sk_buff *skb, u32 mtu); 392 }; 393 394 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 395 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 396 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); 397 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family); 398 399 struct xfrm_input_afinfo { 400 u8 family; 401 bool is_ipip; 402 int (*callback)(struct sk_buff *skb, u8 protocol, 403 int err); 404 }; 405 406 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo); 407 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo); 408 409 void xfrm_flush_gc(void); 410 void xfrm_state_delete_tunnel(struct xfrm_state *x); 411 412 struct xfrm_type { 413 struct module *owner; 414 u8 proto; 415 u8 flags; 416 #define XFRM_TYPE_NON_FRAGMENT 1 417 #define XFRM_TYPE_REPLAY_PROT 2 418 #define XFRM_TYPE_LOCAL_COADDR 4 419 #define XFRM_TYPE_REMOTE_COADDR 8 420 421 int (*init_state)(struct xfrm_state *x, 422 struct netlink_ext_ack *extack); 423 void (*destructor)(struct xfrm_state *); 424 int (*input)(struct xfrm_state *, struct sk_buff *skb); 425 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 426 int (*reject)(struct xfrm_state *, struct sk_buff *, 427 const struct flowi *); 428 }; 429 430 int xfrm_register_type(const struct xfrm_type *type, unsigned short family); 431 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); 432 433 struct xfrm_type_offload { 434 struct module *owner; 435 u8 proto; 436 void (*encap)(struct xfrm_state *, struct sk_buff *pskb); 437 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb); 438 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features); 439 }; 440 441 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family); 442 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family); 443 444 static inline int xfrm_af2proto(unsigned int family) 445 { 446 switch(family) { 447 case AF_INET: 448 return IPPROTO_IPIP; 449 case AF_INET6: 450 return IPPROTO_IPV6; 451 default: 452 return 0; 453 } 454 } 455 456 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto) 457 { 458 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) || 459 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6)) 460 return &x->inner_mode; 461 else 462 return &x->inner_mode_iaf; 463 } 464 465 struct xfrm_tmpl { 466 /* id in template is interpreted as: 467 * daddr - destination of tunnel, may be zero for transport mode. 468 * spi - zero to acquire spi. Not zero if spi is static, then 469 * daddr must be fixed too. 470 * proto - AH/ESP/IPCOMP 471 */ 472 struct xfrm_id id; 473 474 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 475 xfrm_address_t saddr; 476 477 unsigned short encap_family; 478 479 u32 reqid; 480 481 /* Mode: transport, tunnel etc. */ 482 u8 mode; 483 484 /* Sharing mode: unique, this session only, this user only etc. */ 485 u8 share; 486 487 /* May skip this transfomration if no SA is found */ 488 u8 optional; 489 490 /* Skip aalgos/ealgos/calgos checks. */ 491 u8 allalgs; 492 493 /* Bit mask of algos allowed for acquisition */ 494 u32 aalgos; 495 u32 ealgos; 496 u32 calgos; 497 }; 498 499 #define XFRM_MAX_DEPTH 6 500 #define XFRM_MAX_OFFLOAD_DEPTH 1 501 502 struct xfrm_policy_walk_entry { 503 struct list_head all; 504 u8 dead; 505 }; 506 507 struct xfrm_policy_walk { 508 struct xfrm_policy_walk_entry walk; 509 u8 type; 510 u32 seq; 511 }; 512 513 struct xfrm_policy_queue { 514 struct sk_buff_head hold_queue; 515 struct timer_list hold_timer; 516 unsigned long timeout; 517 }; 518 519 struct xfrm_policy { 520 possible_net_t xp_net; 521 struct hlist_node bydst; 522 struct hlist_node byidx; 523 524 /* This lock only affects elements except for entry. */ 525 rwlock_t lock; 526 refcount_t refcnt; 527 u32 pos; 528 struct timer_list timer; 529 530 atomic_t genid; 531 u32 priority; 532 u32 index; 533 u32 if_id; 534 struct xfrm_mark mark; 535 struct xfrm_selector selector; 536 struct xfrm_lifetime_cfg lft; 537 struct xfrm_lifetime_cur curlft; 538 struct xfrm_policy_walk_entry walk; 539 struct xfrm_policy_queue polq; 540 bool bydst_reinsert; 541 u8 type; 542 u8 action; 543 u8 flags; 544 u8 xfrm_nr; 545 u16 family; 546 struct xfrm_sec_ctx *security; 547 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 548 struct hlist_node bydst_inexact_list; 549 struct rcu_head rcu; 550 551 struct xfrm_dev_offload xdo; 552 }; 553 554 static inline struct net *xp_net(const struct xfrm_policy *xp) 555 { 556 return read_pnet(&xp->xp_net); 557 } 558 559 struct xfrm_kmaddress { 560 xfrm_address_t local; 561 xfrm_address_t remote; 562 u32 reserved; 563 u16 family; 564 }; 565 566 struct xfrm_migrate { 567 xfrm_address_t old_daddr; 568 xfrm_address_t old_saddr; 569 xfrm_address_t new_daddr; 570 xfrm_address_t new_saddr; 571 u8 proto; 572 u8 mode; 573 u16 reserved; 574 u32 reqid; 575 u16 old_family; 576 u16 new_family; 577 }; 578 579 #define XFRM_KM_TIMEOUT 30 580 /* what happened */ 581 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 582 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 583 584 /* default aevent timeout in units of 100ms */ 585 #define XFRM_AE_ETIME 10 586 /* Async Event timer multiplier */ 587 #define XFRM_AE_ETH_M 10 588 /* default seq threshold size */ 589 #define XFRM_AE_SEQT_SIZE 2 590 591 struct xfrm_mgr { 592 struct list_head list; 593 int (*notify)(struct xfrm_state *x, const struct km_event *c); 594 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp); 595 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 596 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 597 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c); 598 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 599 int (*migrate)(const struct xfrm_selector *sel, 600 u8 dir, u8 type, 601 const struct xfrm_migrate *m, 602 int num_bundles, 603 const struct xfrm_kmaddress *k, 604 const struct xfrm_encap_tmpl *encap); 605 bool (*is_alive)(const struct km_event *c); 606 }; 607 608 void xfrm_register_km(struct xfrm_mgr *km); 609 void xfrm_unregister_km(struct xfrm_mgr *km); 610 611 struct xfrm_tunnel_skb_cb { 612 union { 613 struct inet_skb_parm h4; 614 struct inet6_skb_parm h6; 615 } header; 616 617 union { 618 struct ip_tunnel *ip4; 619 struct ip6_tnl *ip6; 620 } tunnel; 621 }; 622 623 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0])) 624 625 /* 626 * This structure is used for the duration where packets are being 627 * transformed by IPsec. As soon as the packet leaves IPsec the 628 * area beyond the generic IP part may be overwritten. 629 */ 630 struct xfrm_skb_cb { 631 struct xfrm_tunnel_skb_cb header; 632 633 /* Sequence number for replay protection. */ 634 union { 635 struct { 636 __u32 low; 637 __u32 hi; 638 } output; 639 struct { 640 __be32 low; 641 __be32 hi; 642 } input; 643 } seq; 644 }; 645 646 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) 647 648 /* 649 * This structure is used by the afinfo prepare_input/prepare_output functions 650 * to transmit header information to the mode input/output functions. 651 */ 652 struct xfrm_mode_skb_cb { 653 struct xfrm_tunnel_skb_cb header; 654 655 /* Copied from header for IPv4, always set to zero and DF for IPv6. */ 656 __be16 id; 657 __be16 frag_off; 658 659 /* IP header length (excluding options or extension headers). */ 660 u8 ihl; 661 662 /* TOS for IPv4, class for IPv6. */ 663 u8 tos; 664 665 /* TTL for IPv4, hop limitfor IPv6. */ 666 u8 ttl; 667 668 /* Protocol for IPv4, NH for IPv6. */ 669 u8 protocol; 670 671 /* Option length for IPv4, zero for IPv6. */ 672 u8 optlen; 673 674 /* Used by IPv6 only, zero for IPv4. */ 675 u8 flow_lbl[3]; 676 }; 677 678 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0])) 679 680 /* 681 * This structure is used by the input processing to locate the SPI and 682 * related information. 683 */ 684 struct xfrm_spi_skb_cb { 685 struct xfrm_tunnel_skb_cb header; 686 687 unsigned int daddroff; 688 unsigned int family; 689 __be32 seq; 690 }; 691 692 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0])) 693 694 #ifdef CONFIG_AUDITSYSCALL 695 static inline struct audit_buffer *xfrm_audit_start(const char *op) 696 { 697 struct audit_buffer *audit_buf = NULL; 698 699 if (audit_enabled == AUDIT_OFF) 700 return NULL; 701 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC, 702 AUDIT_MAC_IPSEC_EVENT); 703 if (audit_buf == NULL) 704 return NULL; 705 audit_log_format(audit_buf, "op=%s", op); 706 return audit_buf; 707 } 708 709 static inline void xfrm_audit_helper_usrinfo(bool task_valid, 710 struct audit_buffer *audit_buf) 711 { 712 const unsigned int auid = from_kuid(&init_user_ns, task_valid ? 713 audit_get_loginuid(current) : 714 INVALID_UID); 715 const unsigned int ses = task_valid ? audit_get_sessionid(current) : 716 AUDIT_SID_UNSET; 717 718 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses); 719 audit_log_task_context(audit_buf); 720 } 721 722 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid); 723 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 724 bool task_valid); 725 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid); 726 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid); 727 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 728 struct sk_buff *skb); 729 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb, 730 __be32 net_seq); 731 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family); 732 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi, 733 __be32 net_seq); 734 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb, 735 u8 proto); 736 #else 737 738 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 739 bool task_valid) 740 { 741 } 742 743 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 744 bool task_valid) 745 { 746 } 747 748 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result, 749 bool task_valid) 750 { 751 } 752 753 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result, 754 bool task_valid) 755 { 756 } 757 758 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 759 struct sk_buff *skb) 760 { 761 } 762 763 static inline void xfrm_audit_state_replay(struct xfrm_state *x, 764 struct sk_buff *skb, __be32 net_seq) 765 { 766 } 767 768 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb, 769 u16 family) 770 { 771 } 772 773 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 774 __be32 net_spi, __be32 net_seq) 775 { 776 } 777 778 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x, 779 struct sk_buff *skb, u8 proto) 780 { 781 } 782 #endif /* CONFIG_AUDITSYSCALL */ 783 784 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 785 { 786 if (likely(policy != NULL)) 787 refcount_inc(&policy->refcnt); 788 } 789 790 void xfrm_policy_destroy(struct xfrm_policy *policy); 791 792 static inline void xfrm_pol_put(struct xfrm_policy *policy) 793 { 794 if (refcount_dec_and_test(&policy->refcnt)) 795 xfrm_policy_destroy(policy); 796 } 797 798 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 799 { 800 int i; 801 for (i = npols - 1; i >= 0; --i) 802 xfrm_pol_put(pols[i]); 803 } 804 805 void __xfrm_state_destroy(struct xfrm_state *, bool); 806 807 static inline void __xfrm_state_put(struct xfrm_state *x) 808 { 809 refcount_dec(&x->refcnt); 810 } 811 812 static inline void xfrm_state_put(struct xfrm_state *x) 813 { 814 if (refcount_dec_and_test(&x->refcnt)) 815 __xfrm_state_destroy(x, false); 816 } 817 818 static inline void xfrm_state_put_sync(struct xfrm_state *x) 819 { 820 if (refcount_dec_and_test(&x->refcnt)) 821 __xfrm_state_destroy(x, true); 822 } 823 824 static inline void xfrm_state_hold(struct xfrm_state *x) 825 { 826 refcount_inc(&x->refcnt); 827 } 828 829 static inline bool addr_match(const void *token1, const void *token2, 830 unsigned int prefixlen) 831 { 832 const __be32 *a1 = token1; 833 const __be32 *a2 = token2; 834 unsigned int pdw; 835 unsigned int pbi; 836 837 pdw = prefixlen >> 5; /* num of whole u32 in prefix */ 838 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 839 840 if (pdw) 841 if (memcmp(a1, a2, pdw << 2)) 842 return false; 843 844 if (pbi) { 845 __be32 mask; 846 847 mask = htonl((0xffffffff) << (32 - pbi)); 848 849 if ((a1[pdw] ^ a2[pdw]) & mask) 850 return false; 851 } 852 853 return true; 854 } 855 856 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen) 857 { 858 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */ 859 if (sizeof(long) == 4 && prefixlen == 0) 860 return true; 861 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen))); 862 } 863 864 static __inline__ 865 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli) 866 { 867 __be16 port; 868 switch(fl->flowi_proto) { 869 case IPPROTO_TCP: 870 case IPPROTO_UDP: 871 case IPPROTO_UDPLITE: 872 case IPPROTO_SCTP: 873 port = uli->ports.sport; 874 break; 875 case IPPROTO_ICMP: 876 case IPPROTO_ICMPV6: 877 port = htons(uli->icmpt.type); 878 break; 879 case IPPROTO_MH: 880 port = htons(uli->mht.type); 881 break; 882 case IPPROTO_GRE: 883 port = htons(ntohl(uli->gre_key) >> 16); 884 break; 885 default: 886 port = 0; /*XXX*/ 887 } 888 return port; 889 } 890 891 static __inline__ 892 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli) 893 { 894 __be16 port; 895 switch(fl->flowi_proto) { 896 case IPPROTO_TCP: 897 case IPPROTO_UDP: 898 case IPPROTO_UDPLITE: 899 case IPPROTO_SCTP: 900 port = uli->ports.dport; 901 break; 902 case IPPROTO_ICMP: 903 case IPPROTO_ICMPV6: 904 port = htons(uli->icmpt.code); 905 break; 906 case IPPROTO_GRE: 907 port = htons(ntohl(uli->gre_key) & 0xffff); 908 break; 909 default: 910 port = 0; /*XXX*/ 911 } 912 return port; 913 } 914 915 bool xfrm_selector_match(const struct xfrm_selector *sel, 916 const struct flowi *fl, unsigned short family); 917 918 #ifdef CONFIG_SECURITY_NETWORK_XFRM 919 /* If neither has a context --> match 920 * Otherwise, both must have a context and the sids, doi, alg must match 921 */ 922 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 923 { 924 return ((!s1 && !s2) || 925 (s1 && s2 && 926 (s1->ctx_sid == s2->ctx_sid) && 927 (s1->ctx_doi == s2->ctx_doi) && 928 (s1->ctx_alg == s2->ctx_alg))); 929 } 930 #else 931 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 932 { 933 return true; 934 } 935 #endif 936 937 /* A struct encoding bundle of transformations to apply to some set of flow. 938 * 939 * xdst->child points to the next element of bundle. 940 * dst->xfrm points to an instanse of transformer. 941 * 942 * Due to unfortunate limitations of current routing cache, which we 943 * have no time to fix, it mirrors struct rtable and bound to the same 944 * routing key, including saddr,daddr. However, we can have many of 945 * bundles differing by session id. All the bundles grow from a parent 946 * policy rule. 947 */ 948 struct xfrm_dst { 949 union { 950 struct dst_entry dst; 951 struct rtable rt; 952 struct rt6_info rt6; 953 } u; 954 struct dst_entry *route; 955 struct dst_entry *child; 956 struct dst_entry *path; 957 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; 958 int num_pols, num_xfrms; 959 u32 xfrm_genid; 960 u32 policy_genid; 961 u32 route_mtu_cached; 962 u32 child_mtu_cached; 963 u32 route_cookie; 964 u32 path_cookie; 965 }; 966 967 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst) 968 { 969 #ifdef CONFIG_XFRM 970 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) { 971 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst; 972 973 return xdst->path; 974 } 975 #endif 976 return (struct dst_entry *) dst; 977 } 978 979 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst) 980 { 981 #ifdef CONFIG_XFRM 982 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) { 983 struct xfrm_dst *xdst = (struct xfrm_dst *) dst; 984 return xdst->child; 985 } 986 #endif 987 return NULL; 988 } 989 990 #ifdef CONFIG_XFRM 991 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child) 992 { 993 xdst->child = child; 994 } 995 996 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 997 { 998 xfrm_pols_put(xdst->pols, xdst->num_pols); 999 dst_release(xdst->route); 1000 if (likely(xdst->u.dst.xfrm)) 1001 xfrm_state_put(xdst->u.dst.xfrm); 1002 } 1003 #endif 1004 1005 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 1006 1007 struct xfrm_if_parms { 1008 int link; /* ifindex of underlying L2 interface */ 1009 u32 if_id; /* interface identifyer */ 1010 bool collect_md; 1011 }; 1012 1013 struct xfrm_if { 1014 struct xfrm_if __rcu *next; /* next interface in list */ 1015 struct net_device *dev; /* virtual device associated with interface */ 1016 struct net *net; /* netns for packet i/o */ 1017 struct xfrm_if_parms p; /* interface parms */ 1018 1019 struct gro_cells gro_cells; 1020 }; 1021 1022 struct xfrm_offload { 1023 /* Output sequence number for replay protection on offloading. */ 1024 struct { 1025 __u32 low; 1026 __u32 hi; 1027 } seq; 1028 1029 __u32 flags; 1030 #define SA_DELETE_REQ 1 1031 #define CRYPTO_DONE 2 1032 #define CRYPTO_NEXT_DONE 4 1033 #define CRYPTO_FALLBACK 8 1034 #define XFRM_GSO_SEGMENT 16 1035 #define XFRM_GRO 32 1036 /* 64 is free */ 1037 #define XFRM_DEV_RESUME 128 1038 #define XFRM_XMIT 256 1039 1040 __u32 status; 1041 #define CRYPTO_SUCCESS 1 1042 #define CRYPTO_GENERIC_ERROR 2 1043 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4 1044 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8 1045 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16 1046 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32 1047 #define CRYPTO_INVALID_PACKET_SYNTAX 64 1048 #define CRYPTO_INVALID_PROTOCOL 128 1049 1050 __u8 proto; 1051 __u8 inner_ipproto; 1052 }; 1053 1054 struct sec_path { 1055 int len; 1056 int olen; 1057 int verified_cnt; 1058 1059 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 1060 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH]; 1061 }; 1062 1063 struct sec_path *secpath_set(struct sk_buff *skb); 1064 1065 static inline void 1066 secpath_reset(struct sk_buff *skb) 1067 { 1068 #ifdef CONFIG_XFRM 1069 skb_ext_del(skb, SKB_EXT_SEC_PATH); 1070 #endif 1071 } 1072 1073 static inline int 1074 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family) 1075 { 1076 switch (family) { 1077 case AF_INET: 1078 return addr->a4 == 0; 1079 case AF_INET6: 1080 return ipv6_addr_any(&addr->in6); 1081 } 1082 return 0; 1083 } 1084 1085 static inline int 1086 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1087 { 1088 return (tmpl->saddr.a4 && 1089 tmpl->saddr.a4 != x->props.saddr.a4); 1090 } 1091 1092 static inline int 1093 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1094 { 1095 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 1096 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 1097 } 1098 1099 static inline int 1100 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family) 1101 { 1102 switch (family) { 1103 case AF_INET: 1104 return __xfrm4_state_addr_cmp(tmpl, x); 1105 case AF_INET6: 1106 return __xfrm6_state_addr_cmp(tmpl, x); 1107 } 1108 return !0; 1109 } 1110 1111 #ifdef CONFIG_XFRM 1112 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) 1113 { 1114 struct sec_path *sp = skb_sec_path(skb); 1115 1116 return sp->xvec[sp->len - 1]; 1117 } 1118 #endif 1119 1120 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb) 1121 { 1122 #ifdef CONFIG_XFRM 1123 struct sec_path *sp = skb_sec_path(skb); 1124 1125 if (!sp || !sp->olen || sp->len != sp->olen) 1126 return NULL; 1127 1128 return &sp->ovec[sp->olen - 1]; 1129 #else 1130 return NULL; 1131 #endif 1132 } 1133 1134 #ifdef CONFIG_XFRM 1135 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, 1136 unsigned short family); 1137 1138 static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb, 1139 int dir) 1140 { 1141 if (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) 1142 return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT; 1143 1144 return false; 1145 } 1146 1147 static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb, 1148 int dir, unsigned short family) 1149 { 1150 if (dir != XFRM_POLICY_OUT && family == AF_INET) { 1151 /* same dst may be used for traffic originating from 1152 * devices with different policy settings. 1153 */ 1154 return IPCB(skb)->flags & IPSKB_NOPOLICY; 1155 } 1156 return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY); 1157 } 1158 1159 static inline int __xfrm_policy_check2(struct sock *sk, int dir, 1160 struct sk_buff *skb, 1161 unsigned int family, int reverse) 1162 { 1163 struct net *net = dev_net(skb->dev); 1164 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); 1165 struct xfrm_offload *xo = xfrm_offload(skb); 1166 struct xfrm_state *x; 1167 1168 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 1169 return __xfrm_policy_check(sk, ndir, skb, family); 1170 1171 if (xo) { 1172 x = xfrm_input_state(skb); 1173 if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET) 1174 return (xo->flags & CRYPTO_DONE) && 1175 (xo->status & CRYPTO_SUCCESS); 1176 } 1177 1178 return __xfrm_check_nopolicy(net, skb, dir) || 1179 __xfrm_check_dev_nopolicy(skb, dir, family) || 1180 __xfrm_policy_check(sk, ndir, skb, family); 1181 } 1182 1183 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1184 { 1185 return __xfrm_policy_check2(sk, dir, skb, family, 0); 1186 } 1187 1188 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1189 { 1190 return xfrm_policy_check(sk, dir, skb, AF_INET); 1191 } 1192 1193 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1194 { 1195 return xfrm_policy_check(sk, dir, skb, AF_INET6); 1196 } 1197 1198 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1199 struct sk_buff *skb) 1200 { 1201 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); 1202 } 1203 1204 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1205 struct sk_buff *skb) 1206 { 1207 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); 1208 } 1209 1210 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1211 unsigned int family, int reverse); 1212 1213 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1214 unsigned int family) 1215 { 1216 return __xfrm_decode_session(skb, fl, family, 0); 1217 } 1218 1219 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1220 struct flowi *fl, 1221 unsigned int family) 1222 { 1223 return __xfrm_decode_session(skb, fl, family, 1); 1224 } 1225 1226 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 1227 1228 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 1229 { 1230 struct net *net = dev_net(skb->dev); 1231 1232 if (!net->xfrm.policy_count[XFRM_POLICY_OUT] && 1233 net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT) 1234 return true; 1235 1236 return (skb_dst(skb)->flags & DST_NOXFRM) || 1237 __xfrm_route_forward(skb, family); 1238 } 1239 1240 static inline int xfrm4_route_forward(struct sk_buff *skb) 1241 { 1242 return xfrm_route_forward(skb, AF_INET); 1243 } 1244 1245 static inline int xfrm6_route_forward(struct sk_buff *skb) 1246 { 1247 return xfrm_route_forward(skb, AF_INET6); 1248 } 1249 1250 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk); 1251 1252 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) 1253 { 1254 if (!sk_fullsock(osk)) 1255 return 0; 1256 sk->sk_policy[0] = NULL; 1257 sk->sk_policy[1] = NULL; 1258 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1])) 1259 return __xfrm_sk_clone_policy(sk, osk); 1260 return 0; 1261 } 1262 1263 int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 1264 1265 static inline void xfrm_sk_free_policy(struct sock *sk) 1266 { 1267 struct xfrm_policy *pol; 1268 1269 pol = rcu_dereference_protected(sk->sk_policy[0], 1); 1270 if (unlikely(pol != NULL)) { 1271 xfrm_policy_delete(pol, XFRM_POLICY_MAX); 1272 sk->sk_policy[0] = NULL; 1273 } 1274 pol = rcu_dereference_protected(sk->sk_policy[1], 1); 1275 if (unlikely(pol != NULL)) { 1276 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1); 1277 sk->sk_policy[1] = NULL; 1278 } 1279 } 1280 1281 #else 1282 1283 static inline void xfrm_sk_free_policy(struct sock *sk) {} 1284 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; } 1285 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 1286 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 1287 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1288 { 1289 return 1; 1290 } 1291 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1292 { 1293 return 1; 1294 } 1295 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1296 { 1297 return 1; 1298 } 1299 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1300 struct flowi *fl, 1301 unsigned int family) 1302 { 1303 return -ENOSYS; 1304 } 1305 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1306 struct sk_buff *skb) 1307 { 1308 return 1; 1309 } 1310 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1311 struct sk_buff *skb) 1312 { 1313 return 1; 1314 } 1315 #endif 1316 1317 static __inline__ 1318 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family) 1319 { 1320 switch (family){ 1321 case AF_INET: 1322 return (xfrm_address_t *)&fl->u.ip4.daddr; 1323 case AF_INET6: 1324 return (xfrm_address_t *)&fl->u.ip6.daddr; 1325 } 1326 return NULL; 1327 } 1328 1329 static __inline__ 1330 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family) 1331 { 1332 switch (family){ 1333 case AF_INET: 1334 return (xfrm_address_t *)&fl->u.ip4.saddr; 1335 case AF_INET6: 1336 return (xfrm_address_t *)&fl->u.ip6.saddr; 1337 } 1338 return NULL; 1339 } 1340 1341 static __inline__ 1342 void xfrm_flowi_addr_get(const struct flowi *fl, 1343 xfrm_address_t *saddr, xfrm_address_t *daddr, 1344 unsigned short family) 1345 { 1346 switch(family) { 1347 case AF_INET: 1348 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4)); 1349 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4)); 1350 break; 1351 case AF_INET6: 1352 saddr->in6 = fl->u.ip6.saddr; 1353 daddr->in6 = fl->u.ip6.daddr; 1354 break; 1355 } 1356 } 1357 1358 static __inline__ int 1359 __xfrm4_state_addr_check(const struct xfrm_state *x, 1360 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1361 { 1362 if (daddr->a4 == x->id.daddr.a4 && 1363 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 1364 return 1; 1365 return 0; 1366 } 1367 1368 static __inline__ int 1369 __xfrm6_state_addr_check(const struct xfrm_state *x, 1370 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1371 { 1372 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 1373 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) || 1374 ipv6_addr_any((struct in6_addr *)saddr) || 1375 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 1376 return 1; 1377 return 0; 1378 } 1379 1380 static __inline__ int 1381 xfrm_state_addr_check(const struct xfrm_state *x, 1382 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1383 unsigned short family) 1384 { 1385 switch (family) { 1386 case AF_INET: 1387 return __xfrm4_state_addr_check(x, daddr, saddr); 1388 case AF_INET6: 1389 return __xfrm6_state_addr_check(x, daddr, saddr); 1390 } 1391 return 0; 1392 } 1393 1394 static __inline__ int 1395 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl, 1396 unsigned short family) 1397 { 1398 switch (family) { 1399 case AF_INET: 1400 return __xfrm4_state_addr_check(x, 1401 (const xfrm_address_t *)&fl->u.ip4.daddr, 1402 (const xfrm_address_t *)&fl->u.ip4.saddr); 1403 case AF_INET6: 1404 return __xfrm6_state_addr_check(x, 1405 (const xfrm_address_t *)&fl->u.ip6.daddr, 1406 (const xfrm_address_t *)&fl->u.ip6.saddr); 1407 } 1408 return 0; 1409 } 1410 1411 static inline int xfrm_state_kern(const struct xfrm_state *x) 1412 { 1413 return atomic_read(&x->tunnel_users); 1414 } 1415 1416 static inline bool xfrm_id_proto_valid(u8 proto) 1417 { 1418 switch (proto) { 1419 case IPPROTO_AH: 1420 case IPPROTO_ESP: 1421 case IPPROTO_COMP: 1422 #if IS_ENABLED(CONFIG_IPV6) 1423 case IPPROTO_ROUTING: 1424 case IPPROTO_DSTOPTS: 1425 #endif 1426 return true; 1427 default: 1428 return false; 1429 } 1430 } 1431 1432 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */ 1433 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 1434 { 1435 return (!userproto || proto == userproto || 1436 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 1437 proto == IPPROTO_ESP || 1438 proto == IPPROTO_COMP))); 1439 } 1440 1441 /* 1442 * xfrm algorithm information 1443 */ 1444 struct xfrm_algo_aead_info { 1445 char *geniv; 1446 u16 icv_truncbits; 1447 }; 1448 1449 struct xfrm_algo_auth_info { 1450 u16 icv_truncbits; 1451 u16 icv_fullbits; 1452 }; 1453 1454 struct xfrm_algo_encr_info { 1455 char *geniv; 1456 u16 blockbits; 1457 u16 defkeybits; 1458 }; 1459 1460 struct xfrm_algo_comp_info { 1461 u16 threshold; 1462 }; 1463 1464 struct xfrm_algo_desc { 1465 char *name; 1466 char *compat; 1467 u8 available:1; 1468 u8 pfkey_supported:1; 1469 union { 1470 struct xfrm_algo_aead_info aead; 1471 struct xfrm_algo_auth_info auth; 1472 struct xfrm_algo_encr_info encr; 1473 struct xfrm_algo_comp_info comp; 1474 } uinfo; 1475 struct sadb_alg desc; 1476 }; 1477 1478 /* XFRM protocol handlers. */ 1479 struct xfrm4_protocol { 1480 int (*handler)(struct sk_buff *skb); 1481 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1482 int encap_type); 1483 int (*cb_handler)(struct sk_buff *skb, int err); 1484 int (*err_handler)(struct sk_buff *skb, u32 info); 1485 1486 struct xfrm4_protocol __rcu *next; 1487 int priority; 1488 }; 1489 1490 struct xfrm6_protocol { 1491 int (*handler)(struct sk_buff *skb); 1492 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1493 int encap_type); 1494 int (*cb_handler)(struct sk_buff *skb, int err); 1495 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1496 u8 type, u8 code, int offset, __be32 info); 1497 1498 struct xfrm6_protocol __rcu *next; 1499 int priority; 1500 }; 1501 1502 /* XFRM tunnel handlers. */ 1503 struct xfrm_tunnel { 1504 int (*handler)(struct sk_buff *skb); 1505 int (*cb_handler)(struct sk_buff *skb, int err); 1506 int (*err_handler)(struct sk_buff *skb, u32 info); 1507 1508 struct xfrm_tunnel __rcu *next; 1509 int priority; 1510 }; 1511 1512 struct xfrm6_tunnel { 1513 int (*handler)(struct sk_buff *skb); 1514 int (*cb_handler)(struct sk_buff *skb, int err); 1515 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1516 u8 type, u8 code, int offset, __be32 info); 1517 struct xfrm6_tunnel __rcu *next; 1518 int priority; 1519 }; 1520 1521 void xfrm_init(void); 1522 void xfrm4_init(void); 1523 int xfrm_state_init(struct net *net); 1524 void xfrm_state_fini(struct net *net); 1525 void xfrm4_state_init(void); 1526 void xfrm4_protocol_init(void); 1527 #ifdef CONFIG_XFRM 1528 int xfrm6_init(void); 1529 void xfrm6_fini(void); 1530 int xfrm6_state_init(void); 1531 void xfrm6_state_fini(void); 1532 int xfrm6_protocol_init(void); 1533 void xfrm6_protocol_fini(void); 1534 #else 1535 static inline int xfrm6_init(void) 1536 { 1537 return 0; 1538 } 1539 static inline void xfrm6_fini(void) 1540 { 1541 ; 1542 } 1543 #endif 1544 1545 #ifdef CONFIG_XFRM_STATISTICS 1546 int xfrm_proc_init(struct net *net); 1547 void xfrm_proc_fini(struct net *net); 1548 #endif 1549 1550 int xfrm_sysctl_init(struct net *net); 1551 #ifdef CONFIG_SYSCTL 1552 void xfrm_sysctl_fini(struct net *net); 1553 #else 1554 static inline void xfrm_sysctl_fini(struct net *net) 1555 { 1556 } 1557 #endif 1558 1559 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 1560 struct xfrm_address_filter *filter); 1561 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1562 int (*func)(struct xfrm_state *, int, void*), void *); 1563 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net); 1564 struct xfrm_state *xfrm_state_alloc(struct net *net); 1565 void xfrm_state_free(struct xfrm_state *x); 1566 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr, 1567 const xfrm_address_t *saddr, 1568 const struct flowi *fl, 1569 struct xfrm_tmpl *tmpl, 1570 struct xfrm_policy *pol, int *err, 1571 unsigned short family, u32 if_id); 1572 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id, 1573 xfrm_address_t *daddr, 1574 xfrm_address_t *saddr, 1575 unsigned short family, 1576 u8 mode, u8 proto, u32 reqid); 1577 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1578 unsigned short family); 1579 int xfrm_state_check_expire(struct xfrm_state *x); 1580 #ifdef CONFIG_XFRM_OFFLOAD 1581 static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x) 1582 { 1583 struct xfrm_dev_offload *xdo = &x->xso; 1584 struct net_device *dev = xdo->dev; 1585 1586 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET) 1587 return; 1588 1589 if (dev && dev->xfrmdev_ops && 1590 dev->xfrmdev_ops->xdo_dev_state_update_curlft) 1591 dev->xfrmdev_ops->xdo_dev_state_update_curlft(x); 1592 1593 } 1594 #else 1595 static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x) {} 1596 #endif 1597 void xfrm_state_insert(struct xfrm_state *x); 1598 int xfrm_state_add(struct xfrm_state *x); 1599 int xfrm_state_update(struct xfrm_state *x); 1600 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark, 1601 const xfrm_address_t *daddr, __be32 spi, 1602 u8 proto, unsigned short family); 1603 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1604 const xfrm_address_t *daddr, 1605 const xfrm_address_t *saddr, 1606 u8 proto, 1607 unsigned short family); 1608 #ifdef CONFIG_XFRM_SUB_POLICY 1609 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1610 unsigned short family); 1611 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1612 unsigned short family); 1613 #else 1614 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s, 1615 int n, unsigned short family) 1616 { 1617 } 1618 1619 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s, 1620 int n, unsigned short family) 1621 { 1622 } 1623 #endif 1624 1625 struct xfrmk_sadinfo { 1626 u32 sadhcnt; /* current hash bkts */ 1627 u32 sadhmcnt; /* max allowed hash bkts */ 1628 u32 sadcnt; /* current running count */ 1629 }; 1630 1631 struct xfrmk_spdinfo { 1632 u32 incnt; 1633 u32 outcnt; 1634 u32 fwdcnt; 1635 u32 inscnt; 1636 u32 outscnt; 1637 u32 fwdscnt; 1638 u32 spdhcnt; 1639 u32 spdhmcnt; 1640 }; 1641 1642 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1643 int xfrm_state_delete(struct xfrm_state *x); 1644 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync); 1645 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid); 1646 int xfrm_dev_policy_flush(struct net *net, struct net_device *dev, 1647 bool task_valid); 1648 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); 1649 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); 1650 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq); 1651 int xfrm_init_replay(struct xfrm_state *x, struct netlink_ext_ack *extack); 1652 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu); 1653 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload, 1654 struct netlink_ext_ack *extack); 1655 int xfrm_init_state(struct xfrm_state *x); 1656 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type); 1657 int xfrm_input_resume(struct sk_buff *skb, int nexthdr); 1658 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb, 1659 int (*finish)(struct net *, struct sock *, 1660 struct sk_buff *)); 1661 int xfrm_trans_queue(struct sk_buff *skb, 1662 int (*finish)(struct net *, struct sock *, 1663 struct sk_buff *)); 1664 int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err); 1665 int xfrm_output(struct sock *sk, struct sk_buff *skb); 1666 1667 #if IS_ENABLED(CONFIG_NET_PKTGEN) 1668 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb); 1669 #endif 1670 1671 void xfrm_local_error(struct sk_buff *skb, int mtu); 1672 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1673 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1674 int encap_type); 1675 int xfrm4_transport_finish(struct sk_buff *skb, int async); 1676 int xfrm4_rcv(struct sk_buff *skb); 1677 1678 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1679 { 1680 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL; 1681 XFRM_SPI_SKB_CB(skb)->family = AF_INET; 1682 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); 1683 return xfrm_input(skb, nexthdr, spi, 0); 1684 } 1685 1686 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1687 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol); 1688 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol); 1689 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1690 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1691 void xfrm4_local_error(struct sk_buff *skb, u32 mtu); 1692 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1693 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi, 1694 struct ip6_tnl *t); 1695 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1696 int encap_type); 1697 int xfrm6_transport_finish(struct sk_buff *skb, int async); 1698 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t); 1699 int xfrm6_rcv(struct sk_buff *skb); 1700 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1701 xfrm_address_t *saddr, u8 proto); 1702 void xfrm6_local_error(struct sk_buff *skb, u32 mtu); 1703 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol); 1704 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol); 1705 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1706 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1707 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr); 1708 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr); 1709 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1710 1711 #ifdef CONFIG_XFRM 1712 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu); 1713 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1714 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1715 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, 1716 int optlen); 1717 #else 1718 static inline int xfrm_user_policy(struct sock *sk, int optname, 1719 sockptr_t optval, int optlen) 1720 { 1721 return -ENOPROTOOPT; 1722 } 1723 #endif 1724 1725 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif, 1726 const xfrm_address_t *saddr, 1727 const xfrm_address_t *daddr, 1728 int family, u32 mark); 1729 1730 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); 1731 1732 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); 1733 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, 1734 int (*func)(struct xfrm_policy *, int, int, void*), 1735 void *); 1736 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net); 1737 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1738 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, 1739 const struct xfrm_mark *mark, 1740 u32 if_id, u8 type, int dir, 1741 struct xfrm_selector *sel, 1742 struct xfrm_sec_ctx *ctx, int delete, 1743 int *err); 1744 struct xfrm_policy *xfrm_policy_byid(struct net *net, 1745 const struct xfrm_mark *mark, u32 if_id, 1746 u8 type, int dir, u32 id, int delete, 1747 int *err); 1748 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid); 1749 void xfrm_policy_hash_rebuild(struct net *net); 1750 u32 xfrm_get_acqseq(void); 1751 int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack); 1752 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi, 1753 struct netlink_ext_ack *extack); 1754 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, 1755 u8 mode, u32 reqid, u32 if_id, u8 proto, 1756 const xfrm_address_t *daddr, 1757 const xfrm_address_t *saddr, int create, 1758 unsigned short family); 1759 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1760 1761 #ifdef CONFIG_XFRM_MIGRATE 1762 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1763 const struct xfrm_migrate *m, int num_bundles, 1764 const struct xfrm_kmaddress *k, 1765 const struct xfrm_encap_tmpl *encap); 1766 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net, 1767 u32 if_id); 1768 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 1769 struct xfrm_migrate *m, 1770 struct xfrm_encap_tmpl *encap); 1771 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1772 struct xfrm_migrate *m, int num_bundles, 1773 struct xfrm_kmaddress *k, struct net *net, 1774 struct xfrm_encap_tmpl *encap, u32 if_id, 1775 struct netlink_ext_ack *extack); 1776 #endif 1777 1778 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1779 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid); 1780 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, 1781 xfrm_address_t *addr); 1782 1783 void xfrm_input_init(void); 1784 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1785 1786 void xfrm_probe_algs(void); 1787 int xfrm_count_pfkey_auth_supported(void); 1788 int xfrm_count_pfkey_enc_supported(void); 1789 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1790 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1791 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1792 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1793 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1794 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe); 1795 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe); 1796 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe); 1797 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, 1798 int probe); 1799 1800 static inline bool xfrm6_addr_equal(const xfrm_address_t *a, 1801 const xfrm_address_t *b) 1802 { 1803 return ipv6_addr_equal((const struct in6_addr *)a, 1804 (const struct in6_addr *)b); 1805 } 1806 1807 static inline bool xfrm_addr_equal(const xfrm_address_t *a, 1808 const xfrm_address_t *b, 1809 sa_family_t family) 1810 { 1811 switch (family) { 1812 default: 1813 case AF_INET: 1814 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0; 1815 case AF_INET6: 1816 return xfrm6_addr_equal(a, b); 1817 } 1818 } 1819 1820 static inline int xfrm_policy_id2dir(u32 index) 1821 { 1822 return index & 7; 1823 } 1824 1825 #ifdef CONFIG_XFRM 1826 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq); 1827 int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq); 1828 void xfrm_replay_notify(struct xfrm_state *x, int event); 1829 int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb); 1830 int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq); 1831 1832 static inline int xfrm_aevent_is_on(struct net *net) 1833 { 1834 struct sock *nlsk; 1835 int ret = 0; 1836 1837 rcu_read_lock(); 1838 nlsk = rcu_dereference(net->xfrm.nlsk); 1839 if (nlsk) 1840 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1841 rcu_read_unlock(); 1842 return ret; 1843 } 1844 1845 static inline int xfrm_acquire_is_on(struct net *net) 1846 { 1847 struct sock *nlsk; 1848 int ret = 0; 1849 1850 rcu_read_lock(); 1851 nlsk = rcu_dereference(net->xfrm.nlsk); 1852 if (nlsk) 1853 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE); 1854 rcu_read_unlock(); 1855 1856 return ret; 1857 } 1858 #endif 1859 1860 static inline unsigned int aead_len(struct xfrm_algo_aead *alg) 1861 { 1862 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1863 } 1864 1865 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg) 1866 { 1867 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1868 } 1869 1870 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg) 1871 { 1872 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1873 } 1874 1875 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn) 1876 { 1877 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32); 1878 } 1879 1880 #ifdef CONFIG_XFRM_MIGRATE 1881 static inline int xfrm_replay_clone(struct xfrm_state *x, 1882 struct xfrm_state *orig) 1883 { 1884 1885 x->replay_esn = kmemdup(orig->replay_esn, 1886 xfrm_replay_state_esn_len(orig->replay_esn), 1887 GFP_KERNEL); 1888 if (!x->replay_esn) 1889 return -ENOMEM; 1890 x->preplay_esn = kmemdup(orig->preplay_esn, 1891 xfrm_replay_state_esn_len(orig->preplay_esn), 1892 GFP_KERNEL); 1893 if (!x->preplay_esn) 1894 return -ENOMEM; 1895 1896 return 0; 1897 } 1898 1899 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig) 1900 { 1901 return kmemdup(orig, aead_len(orig), GFP_KERNEL); 1902 } 1903 1904 1905 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1906 { 1907 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); 1908 } 1909 1910 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig) 1911 { 1912 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL); 1913 } 1914 1915 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1916 { 1917 int i; 1918 for (i = 0; i < n; i++) 1919 xfrm_state_put(*(states + i)); 1920 } 1921 1922 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1923 { 1924 int i; 1925 for (i = 0; i < n; i++) 1926 xfrm_state_delete(*(states + i)); 1927 } 1928 #endif 1929 1930 void __init xfrm_dev_init(void); 1931 1932 #ifdef CONFIG_XFRM_OFFLOAD 1933 void xfrm_dev_resume(struct sk_buff *skb); 1934 void xfrm_dev_backlog(struct softnet_data *sd); 1935 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again); 1936 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, 1937 struct xfrm_user_offload *xuo, 1938 struct netlink_ext_ack *extack); 1939 int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp, 1940 struct xfrm_user_offload *xuo, u8 dir, 1941 struct netlink_ext_ack *extack); 1942 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x); 1943 1944 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 1945 { 1946 struct xfrm_dev_offload *xso = &x->xso; 1947 1948 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn) 1949 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x); 1950 } 1951 1952 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 1953 { 1954 struct xfrm_state *x = dst->xfrm; 1955 struct xfrm_dst *xdst; 1956 1957 if (!x || !x->type_offload) 1958 return false; 1959 1960 xdst = (struct xfrm_dst *) dst; 1961 if (!x->xso.offload_handle && !xdst->child->xfrm) 1962 return true; 1963 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) && 1964 !xdst->child->xfrm) 1965 return true; 1966 1967 return false; 1968 } 1969 1970 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 1971 { 1972 struct xfrm_dev_offload *xso = &x->xso; 1973 1974 if (xso->dev) 1975 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x); 1976 } 1977 1978 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1979 { 1980 struct xfrm_dev_offload *xso = &x->xso; 1981 struct net_device *dev = xso->dev; 1982 1983 if (dev && dev->xfrmdev_ops) { 1984 if (dev->xfrmdev_ops->xdo_dev_state_free) 1985 dev->xfrmdev_ops->xdo_dev_state_free(x); 1986 xso->dev = NULL; 1987 netdev_put(dev, &xso->dev_tracker); 1988 } 1989 } 1990 1991 static inline void xfrm_dev_policy_delete(struct xfrm_policy *x) 1992 { 1993 struct xfrm_dev_offload *xdo = &x->xdo; 1994 struct net_device *dev = xdo->dev; 1995 1996 if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_policy_delete) 1997 dev->xfrmdev_ops->xdo_dev_policy_delete(x); 1998 } 1999 2000 static inline void xfrm_dev_policy_free(struct xfrm_policy *x) 2001 { 2002 struct xfrm_dev_offload *xdo = &x->xdo; 2003 struct net_device *dev = xdo->dev; 2004 2005 if (dev && dev->xfrmdev_ops) { 2006 if (dev->xfrmdev_ops->xdo_dev_policy_free) 2007 dev->xfrmdev_ops->xdo_dev_policy_free(x); 2008 xdo->dev = NULL; 2009 netdev_put(dev, &xdo->dev_tracker); 2010 } 2011 } 2012 #else 2013 static inline void xfrm_dev_resume(struct sk_buff *skb) 2014 { 2015 } 2016 2017 static inline void xfrm_dev_backlog(struct softnet_data *sd) 2018 { 2019 } 2020 2021 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again) 2022 { 2023 return skb; 2024 } 2025 2026 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo, struct netlink_ext_ack *extack) 2027 { 2028 return 0; 2029 } 2030 2031 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 2032 { 2033 } 2034 2035 static inline void xfrm_dev_state_free(struct xfrm_state *x) 2036 { 2037 } 2038 2039 static inline int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp, 2040 struct xfrm_user_offload *xuo, u8 dir, 2041 struct netlink_ext_ack *extack) 2042 { 2043 return 0; 2044 } 2045 2046 static inline void xfrm_dev_policy_delete(struct xfrm_policy *x) 2047 { 2048 } 2049 2050 static inline void xfrm_dev_policy_free(struct xfrm_policy *x) 2051 { 2052 } 2053 2054 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) 2055 { 2056 return false; 2057 } 2058 2059 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 2060 { 2061 } 2062 2063 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 2064 { 2065 return false; 2066 } 2067 #endif 2068 2069 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) 2070 { 2071 if (attrs[XFRMA_MARK]) 2072 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark)); 2073 else 2074 m->v = m->m = 0; 2075 2076 return m->v & m->m; 2077 } 2078 2079 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m) 2080 { 2081 int ret = 0; 2082 2083 if (m->m | m->v) 2084 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); 2085 return ret; 2086 } 2087 2088 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x) 2089 { 2090 struct xfrm_mark *m = &x->props.smark; 2091 2092 return (m->v & m->m) | (mark & ~m->m); 2093 } 2094 2095 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id) 2096 { 2097 int ret = 0; 2098 2099 if (if_id) 2100 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id); 2101 return ret; 2102 } 2103 2104 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x, 2105 unsigned int family) 2106 { 2107 bool tunnel = false; 2108 2109 switch(family) { 2110 case AF_INET: 2111 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) 2112 tunnel = true; 2113 break; 2114 case AF_INET6: 2115 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) 2116 tunnel = true; 2117 break; 2118 } 2119 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL)) 2120 return -EINVAL; 2121 2122 return 0; 2123 } 2124 2125 extern const int xfrm_msg_min[XFRM_NR_MSGTYPES]; 2126 extern const struct nla_policy xfrma_policy[XFRMA_MAX+1]; 2127 2128 struct xfrm_translator { 2129 /* Allocate frag_list and put compat translation there */ 2130 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src); 2131 2132 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */ 2133 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh, 2134 int maxtype, const struct nla_policy *policy, 2135 struct netlink_ext_ack *extack); 2136 2137 /* Translate 32-bit user_policy from sockptr */ 2138 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen); 2139 2140 struct module *owner; 2141 }; 2142 2143 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT) 2144 extern int xfrm_register_translator(struct xfrm_translator *xtr); 2145 extern int xfrm_unregister_translator(struct xfrm_translator *xtr); 2146 extern struct xfrm_translator *xfrm_get_translator(void); 2147 extern void xfrm_put_translator(struct xfrm_translator *xtr); 2148 #else 2149 static inline struct xfrm_translator *xfrm_get_translator(void) 2150 { 2151 return NULL; 2152 } 2153 static inline void xfrm_put_translator(struct xfrm_translator *xtr) 2154 { 2155 } 2156 #endif 2157 2158 #if IS_ENABLED(CONFIG_IPV6) 2159 static inline bool xfrm6_local_dontfrag(const struct sock *sk) 2160 { 2161 int proto; 2162 2163 if (!sk || sk->sk_family != AF_INET6) 2164 return false; 2165 2166 proto = sk->sk_protocol; 2167 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW) 2168 return inet6_sk(sk)->dontfrag; 2169 2170 return false; 2171 } 2172 #endif 2173 2174 #if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \ 2175 (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES)) 2176 2177 extern struct metadata_dst __percpu *xfrm_bpf_md_dst; 2178 2179 int register_xfrm_interface_bpf(void); 2180 2181 #else 2182 2183 static inline int register_xfrm_interface_bpf(void) 2184 { 2185 return 0; 2186 } 2187 2188 #endif 2189 2190 #endif /* _NET_XFRM_H */ 2191