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