1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _NET_XFRM_H 3 #define _NET_XFRM_H 4 5 #include <linux/compiler.h> 6 #include <linux/xfrm.h> 7 #include <linux/spinlock.h> 8 #include <linux/list.h> 9 #include <linux/skbuff.h> 10 #include <linux/socket.h> 11 #include <linux/pfkeyv2.h> 12 #include <linux/ipsec.h> 13 #include <linux/in6.h> 14 #include <linux/mutex.h> 15 #include <linux/audit.h> 16 #include <linux/slab.h> 17 #include <linux/refcount.h> 18 #include <linux/sockptr.h> 19 20 #include <net/sock.h> 21 #include <net/dst.h> 22 #include <net/ip.h> 23 #include <net/route.h> 24 #include <net/ipv6.h> 25 #include <net/ip6_fib.h> 26 #include <net/flow.h> 27 #include <net/gro_cells.h> 28 29 #include <linux/interrupt.h> 30 31 #ifdef CONFIG_XFRM_STATISTICS 32 #include <net/snmp.h> 33 #endif 34 35 #define XFRM_PROTO_ESP 50 36 #define XFRM_PROTO_AH 51 37 #define XFRM_PROTO_COMP 108 38 #define XFRM_PROTO_IPIP 4 39 #define XFRM_PROTO_IPV6 41 40 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING 41 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS 42 43 #define XFRM_ALIGN4(len) (((len) + 3) & ~3) 44 #define XFRM_ALIGN8(len) (((len) + 7) & ~7) 45 #define MODULE_ALIAS_XFRM_MODE(family, encap) \ 46 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap)) 47 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \ 48 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto)) 49 #define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \ 50 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto)) 51 52 #ifdef CONFIG_XFRM_STATISTICS 53 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field) 54 #else 55 #define XFRM_INC_STATS(net, field) ((void)(net)) 56 #endif 57 58 59 /* Organization of SPD aka "XFRM rules" 60 ------------------------------------ 61 62 Basic objects: 63 - policy rule, struct xfrm_policy (=SPD entry) 64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) 65 - instance of a transformer, struct xfrm_state (=SA) 66 - template to clone xfrm_state, struct xfrm_tmpl 67 68 SPD is plain linear list of xfrm_policy rules, ordered by priority. 69 (To be compatible with existing pfkeyv2 implementations, 70 many rules with priority of 0x7fffffff are allowed to exist and 71 such rules are ordered in an unpredictable way, thanks to bsd folks.) 72 73 Lookup is plain linear search until the first match with selector. 74 75 If "action" is "block", then we prohibit the flow, otherwise: 76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, 77 policy entry has list of up to XFRM_MAX_DEPTH transformations, 78 described by templates xfrm_tmpl. Each template is resolved 79 to a complete xfrm_state (see below) and we pack bundle of transformations 80 to a dst_entry returned to requestor. 81 82 dst -. xfrm .-> xfrm_state #1 83 |---. child .-> dst -. xfrm .-> xfrm_state #2 84 |---. child .-> dst -. xfrm .-> xfrm_state #3 85 |---. child .-> NULL 86 87 Bundles are cached at xrfm_policy struct (field ->bundles). 88 89 90 Resolution of xrfm_tmpl 91 ----------------------- 92 Template contains: 93 1. ->mode Mode: transport or tunnel 94 2. ->id.proto Protocol: AH/ESP/IPCOMP 95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. 96 Q: allow to resolve security gateway? 97 4. ->id.spi If not zero, static SPI. 98 5. ->saddr Local tunnel endpoint, ignored for transport mode. 99 6. ->algos List of allowed algos. Plain bitmask now. 100 Q: ealgos, aalgos, calgos. What a mess... 101 7. ->share Sharing mode. 102 Q: how to implement private sharing mode? To add struct sock* to 103 flow id? 104 105 Having this template we search through SAD searching for entries 106 with appropriate mode/proto/algo, permitted by selector. 107 If no appropriate entry found, it is requested from key manager. 108 109 PROBLEMS: 110 Q: How to find all the bundles referring to a physical path for 111 PMTU discovery? Seems, dst should contain list of all parents... 112 and enter to infinite locking hierarchy disaster. 113 No! It is easier, we will not search for them, let them find us. 114 We add genid to each dst plus pointer to genid of raw IP route, 115 pmtu disc will update pmtu on raw IP route and increase its genid. 116 dst_check() will see this for top level and trigger resyncing 117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved. 118 */ 119 120 struct xfrm_state_walk { 121 struct list_head all; 122 u8 state; 123 u8 dying; 124 u8 proto; 125 u32 seq; 126 struct xfrm_address_filter *filter; 127 }; 128 129 struct xfrm_state_offload { 130 struct net_device *dev; 131 netdevice_tracker dev_tracker; 132 struct net_device *real_dev; 133 unsigned long offload_handle; 134 unsigned int num_exthdrs; 135 u8 flags; 136 }; 137 138 struct xfrm_mode { 139 u8 encap; 140 u8 family; 141 u8 flags; 142 }; 143 144 /* Flags for xfrm_mode. */ 145 enum { 146 XFRM_MODE_FLAG_TUNNEL = 1, 147 }; 148 149 enum xfrm_replay_mode { 150 XFRM_REPLAY_MODE_LEGACY, 151 XFRM_REPLAY_MODE_BMP, 152 XFRM_REPLAY_MODE_ESN, 153 }; 154 155 /* Full description of state of transformer. */ 156 struct xfrm_state { 157 possible_net_t xs_net; 158 union { 159 struct hlist_node gclist; 160 struct hlist_node bydst; 161 }; 162 struct hlist_node bysrc; 163 struct hlist_node byspi; 164 struct hlist_node byseq; 165 166 refcount_t refcnt; 167 spinlock_t lock; 168 169 struct xfrm_id id; 170 struct xfrm_selector sel; 171 struct xfrm_mark mark; 172 u32 if_id; 173 u32 tfcpad; 174 175 u32 genid; 176 177 /* Key manager bits */ 178 struct xfrm_state_walk km; 179 180 /* Parameters of this state. */ 181 struct { 182 u32 reqid; 183 u8 mode; 184 u8 replay_window; 185 u8 aalgo, ealgo, calgo; 186 u8 flags; 187 u16 family; 188 xfrm_address_t saddr; 189 int header_len; 190 int trailer_len; 191 u32 extra_flags; 192 struct xfrm_mark smark; 193 } props; 194 195 struct xfrm_lifetime_cfg lft; 196 197 /* Data for transformer */ 198 struct xfrm_algo_auth *aalg; 199 struct xfrm_algo *ealg; 200 struct xfrm_algo *calg; 201 struct xfrm_algo_aead *aead; 202 const char *geniv; 203 204 /* mapping change rate limiting */ 205 __be16 new_mapping_sport; 206 u32 new_mapping; /* seconds */ 207 u32 mapping_maxage; /* seconds for input SA */ 208 209 /* Data for encapsulator */ 210 struct xfrm_encap_tmpl *encap; 211 struct sock __rcu *encap_sk; 212 213 /* Data for care-of address */ 214 xfrm_address_t *coaddr; 215 216 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 217 struct xfrm_state *tunnel; 218 219 /* If a tunnel, number of users + 1 */ 220 atomic_t tunnel_users; 221 222 /* State for replay detection */ 223 struct xfrm_replay_state replay; 224 struct xfrm_replay_state_esn *replay_esn; 225 226 /* Replay detection state at the time we sent the last notification */ 227 struct xfrm_replay_state preplay; 228 struct xfrm_replay_state_esn *preplay_esn; 229 230 /* replay detection mode */ 231 enum xfrm_replay_mode repl_mode; 232 /* internal flag that only holds state for delayed aevent at the 233 * moment 234 */ 235 u32 xflags; 236 237 /* Replay detection notification settings */ 238 u32 replay_maxage; 239 u32 replay_maxdiff; 240 241 /* Replay detection notification timer */ 242 struct timer_list rtimer; 243 244 /* Statistics */ 245 struct xfrm_stats stats; 246 247 struct xfrm_lifetime_cur curlft; 248 struct hrtimer mtimer; 249 250 struct xfrm_state_offload xso; 251 252 /* used to fix curlft->add_time when changing date */ 253 long saved_tmo; 254 255 /* Last used time */ 256 time64_t lastused; 257 258 struct page_frag xfrag; 259 260 /* Reference to data common to all the instances of this 261 * transformer. */ 262 const struct xfrm_type *type; 263 struct xfrm_mode inner_mode; 264 struct xfrm_mode inner_mode_iaf; 265 struct xfrm_mode outer_mode; 266 267 const struct xfrm_type_offload *type_offload; 268 269 /* Security context */ 270 struct xfrm_sec_ctx *security; 271 272 /* Private data of this transformer, format is opaque, 273 * interpreted by xfrm_type methods. */ 274 void *data; 275 }; 276 277 static inline struct net *xs_net(struct xfrm_state *x) 278 { 279 return read_pnet(&x->xs_net); 280 } 281 282 /* xflags - make enum if more show up */ 283 #define XFRM_TIME_DEFER 1 284 #define XFRM_SOFT_EXPIRE 2 285 286 enum { 287 XFRM_STATE_VOID, 288 XFRM_STATE_ACQ, 289 XFRM_STATE_VALID, 290 XFRM_STATE_ERROR, 291 XFRM_STATE_EXPIRED, 292 XFRM_STATE_DEAD 293 }; 294 295 /* callback structure passed from either netlink or pfkey */ 296 struct km_event { 297 union { 298 u32 hard; 299 u32 proto; 300 u32 byid; 301 u32 aevent; 302 u32 type; 303 } data; 304 305 u32 seq; 306 u32 portid; 307 u32 event; 308 struct net *net; 309 }; 310 311 struct xfrm_if_cb { 312 struct xfrm_if *(*decode_session)(struct sk_buff *skb, 313 unsigned short family); 314 }; 315 316 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb); 317 void xfrm_if_unregister_cb(void); 318 319 struct net_device; 320 struct xfrm_type; 321 struct xfrm_dst; 322 struct xfrm_policy_afinfo { 323 struct dst_ops *dst_ops; 324 struct dst_entry *(*dst_lookup)(struct net *net, 325 int tos, int oif, 326 const xfrm_address_t *saddr, 327 const xfrm_address_t *daddr, 328 u32 mark); 329 int (*get_saddr)(struct net *net, int oif, 330 xfrm_address_t *saddr, 331 xfrm_address_t *daddr, 332 u32 mark); 333 int (*fill_dst)(struct xfrm_dst *xdst, 334 struct net_device *dev, 335 const struct flowi *fl); 336 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig); 337 }; 338 339 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family); 340 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo); 341 void km_policy_notify(struct xfrm_policy *xp, int dir, 342 const struct km_event *c); 343 void km_state_notify(struct xfrm_state *x, const struct km_event *c); 344 345 struct xfrm_tmpl; 346 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, 347 struct xfrm_policy *pol); 348 void km_state_expired(struct xfrm_state *x, int hard, u32 portid); 349 int __xfrm_state_delete(struct xfrm_state *x); 350 351 struct xfrm_state_afinfo { 352 u8 family; 353 u8 proto; 354 355 const struct xfrm_type_offload *type_offload_esp; 356 357 const struct xfrm_type *type_esp; 358 const struct xfrm_type *type_ipip; 359 const struct xfrm_type *type_ipip6; 360 const struct xfrm_type *type_comp; 361 const struct xfrm_type *type_ah; 362 const struct xfrm_type *type_routing; 363 const struct xfrm_type *type_dstopts; 364 365 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb); 366 int (*transport_finish)(struct sk_buff *skb, 367 int async); 368 void (*local_error)(struct sk_buff *skb, u32 mtu); 369 }; 370 371 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 372 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 373 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); 374 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family); 375 376 struct xfrm_input_afinfo { 377 u8 family; 378 bool is_ipip; 379 int (*callback)(struct sk_buff *skb, u8 protocol, 380 int err); 381 }; 382 383 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo); 384 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo); 385 386 void xfrm_flush_gc(void); 387 void xfrm_state_delete_tunnel(struct xfrm_state *x); 388 389 struct xfrm_type { 390 struct module *owner; 391 u8 proto; 392 u8 flags; 393 #define XFRM_TYPE_NON_FRAGMENT 1 394 #define XFRM_TYPE_REPLAY_PROT 2 395 #define XFRM_TYPE_LOCAL_COADDR 4 396 #define XFRM_TYPE_REMOTE_COADDR 8 397 398 int (*init_state)(struct xfrm_state *x); 399 void (*destructor)(struct xfrm_state *); 400 int (*input)(struct xfrm_state *, struct sk_buff *skb); 401 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 402 int (*reject)(struct xfrm_state *, struct sk_buff *, 403 const struct flowi *); 404 }; 405 406 int xfrm_register_type(const struct xfrm_type *type, unsigned short family); 407 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); 408 409 struct xfrm_type_offload { 410 struct module *owner; 411 u8 proto; 412 void (*encap)(struct xfrm_state *, struct sk_buff *pskb); 413 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb); 414 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features); 415 }; 416 417 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family); 418 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family); 419 420 static inline int xfrm_af2proto(unsigned int family) 421 { 422 switch(family) { 423 case AF_INET: 424 return IPPROTO_IPIP; 425 case AF_INET6: 426 return IPPROTO_IPV6; 427 default: 428 return 0; 429 } 430 } 431 432 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto) 433 { 434 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) || 435 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6)) 436 return &x->inner_mode; 437 else 438 return &x->inner_mode_iaf; 439 } 440 441 struct xfrm_tmpl { 442 /* id in template is interpreted as: 443 * daddr - destination of tunnel, may be zero for transport mode. 444 * spi - zero to acquire spi. Not zero if spi is static, then 445 * daddr must be fixed too. 446 * proto - AH/ESP/IPCOMP 447 */ 448 struct xfrm_id id; 449 450 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 451 xfrm_address_t saddr; 452 453 unsigned short encap_family; 454 455 u32 reqid; 456 457 /* Mode: transport, tunnel etc. */ 458 u8 mode; 459 460 /* Sharing mode: unique, this session only, this user only etc. */ 461 u8 share; 462 463 /* May skip this transfomration if no SA is found */ 464 u8 optional; 465 466 /* Skip aalgos/ealgos/calgos checks. */ 467 u8 allalgs; 468 469 /* Bit mask of algos allowed for acquisition */ 470 u32 aalgos; 471 u32 ealgos; 472 u32 calgos; 473 }; 474 475 #define XFRM_MAX_DEPTH 6 476 #define XFRM_MAX_OFFLOAD_DEPTH 1 477 478 struct xfrm_policy_walk_entry { 479 struct list_head all; 480 u8 dead; 481 }; 482 483 struct xfrm_policy_walk { 484 struct xfrm_policy_walk_entry walk; 485 u8 type; 486 u32 seq; 487 }; 488 489 struct xfrm_policy_queue { 490 struct sk_buff_head hold_queue; 491 struct timer_list hold_timer; 492 unsigned long timeout; 493 }; 494 495 struct xfrm_policy { 496 possible_net_t xp_net; 497 struct hlist_node bydst; 498 struct hlist_node byidx; 499 500 /* This lock only affects elements except for entry. */ 501 rwlock_t lock; 502 refcount_t refcnt; 503 u32 pos; 504 struct timer_list timer; 505 506 atomic_t genid; 507 u32 priority; 508 u32 index; 509 u32 if_id; 510 struct xfrm_mark mark; 511 struct xfrm_selector selector; 512 struct xfrm_lifetime_cfg lft; 513 struct xfrm_lifetime_cur curlft; 514 struct xfrm_policy_walk_entry walk; 515 struct xfrm_policy_queue polq; 516 bool bydst_reinsert; 517 u8 type; 518 u8 action; 519 u8 flags; 520 u8 xfrm_nr; 521 u16 family; 522 struct xfrm_sec_ctx *security; 523 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 524 struct hlist_node bydst_inexact_list; 525 struct rcu_head rcu; 526 }; 527 528 static inline struct net *xp_net(const struct xfrm_policy *xp) 529 { 530 return read_pnet(&xp->xp_net); 531 } 532 533 struct xfrm_kmaddress { 534 xfrm_address_t local; 535 xfrm_address_t remote; 536 u32 reserved; 537 u16 family; 538 }; 539 540 struct xfrm_migrate { 541 xfrm_address_t old_daddr; 542 xfrm_address_t old_saddr; 543 xfrm_address_t new_daddr; 544 xfrm_address_t new_saddr; 545 u8 proto; 546 u8 mode; 547 u16 reserved; 548 u32 reqid; 549 u16 old_family; 550 u16 new_family; 551 }; 552 553 #define XFRM_KM_TIMEOUT 30 554 /* what happened */ 555 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 556 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 557 558 /* default aevent timeout in units of 100ms */ 559 #define XFRM_AE_ETIME 10 560 /* Async Event timer multiplier */ 561 #define XFRM_AE_ETH_M 10 562 /* default seq threshold size */ 563 #define XFRM_AE_SEQT_SIZE 2 564 565 struct xfrm_mgr { 566 struct list_head list; 567 int (*notify)(struct xfrm_state *x, const struct km_event *c); 568 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp); 569 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 570 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 571 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c); 572 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 573 int (*migrate)(const struct xfrm_selector *sel, 574 u8 dir, u8 type, 575 const struct xfrm_migrate *m, 576 int num_bundles, 577 const struct xfrm_kmaddress *k, 578 const struct xfrm_encap_tmpl *encap); 579 bool (*is_alive)(const struct km_event *c); 580 }; 581 582 int xfrm_register_km(struct xfrm_mgr *km); 583 int xfrm_unregister_km(struct xfrm_mgr *km); 584 585 struct xfrm_tunnel_skb_cb { 586 union { 587 struct inet_skb_parm h4; 588 struct inet6_skb_parm h6; 589 } header; 590 591 union { 592 struct ip_tunnel *ip4; 593 struct ip6_tnl *ip6; 594 } tunnel; 595 }; 596 597 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0])) 598 599 /* 600 * This structure is used for the duration where packets are being 601 * transformed by IPsec. As soon as the packet leaves IPsec the 602 * area beyond the generic IP part may be overwritten. 603 */ 604 struct xfrm_skb_cb { 605 struct xfrm_tunnel_skb_cb header; 606 607 /* Sequence number for replay protection. */ 608 union { 609 struct { 610 __u32 low; 611 __u32 hi; 612 } output; 613 struct { 614 __be32 low; 615 __be32 hi; 616 } input; 617 } seq; 618 }; 619 620 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) 621 622 /* 623 * This structure is used by the afinfo prepare_input/prepare_output functions 624 * to transmit header information to the mode input/output functions. 625 */ 626 struct xfrm_mode_skb_cb { 627 struct xfrm_tunnel_skb_cb header; 628 629 /* Copied from header for IPv4, always set to zero and DF for IPv6. */ 630 __be16 id; 631 __be16 frag_off; 632 633 /* IP header length (excluding options or extension headers). */ 634 u8 ihl; 635 636 /* TOS for IPv4, class for IPv6. */ 637 u8 tos; 638 639 /* TTL for IPv4, hop limitfor IPv6. */ 640 u8 ttl; 641 642 /* Protocol for IPv4, NH for IPv6. */ 643 u8 protocol; 644 645 /* Option length for IPv4, zero for IPv6. */ 646 u8 optlen; 647 648 /* Used by IPv6 only, zero for IPv4. */ 649 u8 flow_lbl[3]; 650 }; 651 652 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0])) 653 654 /* 655 * This structure is used by the input processing to locate the SPI and 656 * related information. 657 */ 658 struct xfrm_spi_skb_cb { 659 struct xfrm_tunnel_skb_cb header; 660 661 unsigned int daddroff; 662 unsigned int family; 663 __be32 seq; 664 }; 665 666 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0])) 667 668 #ifdef CONFIG_AUDITSYSCALL 669 static inline struct audit_buffer *xfrm_audit_start(const char *op) 670 { 671 struct audit_buffer *audit_buf = NULL; 672 673 if (audit_enabled == AUDIT_OFF) 674 return NULL; 675 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC, 676 AUDIT_MAC_IPSEC_EVENT); 677 if (audit_buf == NULL) 678 return NULL; 679 audit_log_format(audit_buf, "op=%s", op); 680 return audit_buf; 681 } 682 683 static inline void xfrm_audit_helper_usrinfo(bool task_valid, 684 struct audit_buffer *audit_buf) 685 { 686 const unsigned int auid = from_kuid(&init_user_ns, task_valid ? 687 audit_get_loginuid(current) : 688 INVALID_UID); 689 const unsigned int ses = task_valid ? audit_get_sessionid(current) : 690 AUDIT_SID_UNSET; 691 692 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses); 693 audit_log_task_context(audit_buf); 694 } 695 696 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid); 697 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 698 bool task_valid); 699 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid); 700 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid); 701 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 702 struct sk_buff *skb); 703 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb, 704 __be32 net_seq); 705 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family); 706 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi, 707 __be32 net_seq); 708 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb, 709 u8 proto); 710 #else 711 712 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 713 bool task_valid) 714 { 715 } 716 717 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 718 bool task_valid) 719 { 720 } 721 722 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result, 723 bool task_valid) 724 { 725 } 726 727 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result, 728 bool task_valid) 729 { 730 } 731 732 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 733 struct sk_buff *skb) 734 { 735 } 736 737 static inline void xfrm_audit_state_replay(struct xfrm_state *x, 738 struct sk_buff *skb, __be32 net_seq) 739 { 740 } 741 742 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb, 743 u16 family) 744 { 745 } 746 747 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 748 __be32 net_spi, __be32 net_seq) 749 { 750 } 751 752 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x, 753 struct sk_buff *skb, u8 proto) 754 { 755 } 756 #endif /* CONFIG_AUDITSYSCALL */ 757 758 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 759 { 760 if (likely(policy != NULL)) 761 refcount_inc(&policy->refcnt); 762 } 763 764 void xfrm_policy_destroy(struct xfrm_policy *policy); 765 766 static inline void xfrm_pol_put(struct xfrm_policy *policy) 767 { 768 if (refcount_dec_and_test(&policy->refcnt)) 769 xfrm_policy_destroy(policy); 770 } 771 772 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 773 { 774 int i; 775 for (i = npols - 1; i >= 0; --i) 776 xfrm_pol_put(pols[i]); 777 } 778 779 void __xfrm_state_destroy(struct xfrm_state *, bool); 780 781 static inline void __xfrm_state_put(struct xfrm_state *x) 782 { 783 refcount_dec(&x->refcnt); 784 } 785 786 static inline void xfrm_state_put(struct xfrm_state *x) 787 { 788 if (refcount_dec_and_test(&x->refcnt)) 789 __xfrm_state_destroy(x, false); 790 } 791 792 static inline void xfrm_state_put_sync(struct xfrm_state *x) 793 { 794 if (refcount_dec_and_test(&x->refcnt)) 795 __xfrm_state_destroy(x, true); 796 } 797 798 static inline void xfrm_state_hold(struct xfrm_state *x) 799 { 800 refcount_inc(&x->refcnt); 801 } 802 803 static inline bool addr_match(const void *token1, const void *token2, 804 unsigned int prefixlen) 805 { 806 const __be32 *a1 = token1; 807 const __be32 *a2 = token2; 808 unsigned int pdw; 809 unsigned int pbi; 810 811 pdw = prefixlen >> 5; /* num of whole u32 in prefix */ 812 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 813 814 if (pdw) 815 if (memcmp(a1, a2, pdw << 2)) 816 return false; 817 818 if (pbi) { 819 __be32 mask; 820 821 mask = htonl((0xffffffff) << (32 - pbi)); 822 823 if ((a1[pdw] ^ a2[pdw]) & mask) 824 return false; 825 } 826 827 return true; 828 } 829 830 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen) 831 { 832 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */ 833 if (sizeof(long) == 4 && prefixlen == 0) 834 return true; 835 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen))); 836 } 837 838 static __inline__ 839 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli) 840 { 841 __be16 port; 842 switch(fl->flowi_proto) { 843 case IPPROTO_TCP: 844 case IPPROTO_UDP: 845 case IPPROTO_UDPLITE: 846 case IPPROTO_SCTP: 847 port = uli->ports.sport; 848 break; 849 case IPPROTO_ICMP: 850 case IPPROTO_ICMPV6: 851 port = htons(uli->icmpt.type); 852 break; 853 case IPPROTO_MH: 854 port = htons(uli->mht.type); 855 break; 856 case IPPROTO_GRE: 857 port = htons(ntohl(uli->gre_key) >> 16); 858 break; 859 default: 860 port = 0; /*XXX*/ 861 } 862 return port; 863 } 864 865 static __inline__ 866 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli) 867 { 868 __be16 port; 869 switch(fl->flowi_proto) { 870 case IPPROTO_TCP: 871 case IPPROTO_UDP: 872 case IPPROTO_UDPLITE: 873 case IPPROTO_SCTP: 874 port = uli->ports.dport; 875 break; 876 case IPPROTO_ICMP: 877 case IPPROTO_ICMPV6: 878 port = htons(uli->icmpt.code); 879 break; 880 case IPPROTO_GRE: 881 port = htons(ntohl(uli->gre_key) & 0xffff); 882 break; 883 default: 884 port = 0; /*XXX*/ 885 } 886 return port; 887 } 888 889 bool xfrm_selector_match(const struct xfrm_selector *sel, 890 const struct flowi *fl, unsigned short family); 891 892 #ifdef CONFIG_SECURITY_NETWORK_XFRM 893 /* If neither has a context --> match 894 * Otherwise, both must have a context and the sids, doi, alg must match 895 */ 896 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 897 { 898 return ((!s1 && !s2) || 899 (s1 && s2 && 900 (s1->ctx_sid == s2->ctx_sid) && 901 (s1->ctx_doi == s2->ctx_doi) && 902 (s1->ctx_alg == s2->ctx_alg))); 903 } 904 #else 905 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 906 { 907 return true; 908 } 909 #endif 910 911 /* A struct encoding bundle of transformations to apply to some set of flow. 912 * 913 * xdst->child points to the next element of bundle. 914 * dst->xfrm points to an instanse of transformer. 915 * 916 * Due to unfortunate limitations of current routing cache, which we 917 * have no time to fix, it mirrors struct rtable and bound to the same 918 * routing key, including saddr,daddr. However, we can have many of 919 * bundles differing by session id. All the bundles grow from a parent 920 * policy rule. 921 */ 922 struct xfrm_dst { 923 union { 924 struct dst_entry dst; 925 struct rtable rt; 926 struct rt6_info rt6; 927 } u; 928 struct dst_entry *route; 929 struct dst_entry *child; 930 struct dst_entry *path; 931 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; 932 int num_pols, num_xfrms; 933 u32 xfrm_genid; 934 u32 policy_genid; 935 u32 route_mtu_cached; 936 u32 child_mtu_cached; 937 u32 route_cookie; 938 u32 path_cookie; 939 }; 940 941 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst) 942 { 943 #ifdef CONFIG_XFRM 944 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) { 945 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst; 946 947 return xdst->path; 948 } 949 #endif 950 return (struct dst_entry *) dst; 951 } 952 953 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst) 954 { 955 #ifdef CONFIG_XFRM 956 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) { 957 struct xfrm_dst *xdst = (struct xfrm_dst *) dst; 958 return xdst->child; 959 } 960 #endif 961 return NULL; 962 } 963 964 #ifdef CONFIG_XFRM 965 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child) 966 { 967 xdst->child = child; 968 } 969 970 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 971 { 972 xfrm_pols_put(xdst->pols, xdst->num_pols); 973 dst_release(xdst->route); 974 if (likely(xdst->u.dst.xfrm)) 975 xfrm_state_put(xdst->u.dst.xfrm); 976 } 977 #endif 978 979 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 980 981 struct xfrm_if_parms { 982 int link; /* ifindex of underlying L2 interface */ 983 u32 if_id; /* interface identifyer */ 984 }; 985 986 struct xfrm_if { 987 struct xfrm_if __rcu *next; /* next interface in list */ 988 struct net_device *dev; /* virtual device associated with interface */ 989 struct net *net; /* netns for packet i/o */ 990 struct xfrm_if_parms p; /* interface parms */ 991 992 struct gro_cells gro_cells; 993 }; 994 995 struct xfrm_offload { 996 /* Output sequence number for replay protection on offloading. */ 997 struct { 998 __u32 low; 999 __u32 hi; 1000 } seq; 1001 1002 __u32 flags; 1003 #define SA_DELETE_REQ 1 1004 #define CRYPTO_DONE 2 1005 #define CRYPTO_NEXT_DONE 4 1006 #define CRYPTO_FALLBACK 8 1007 #define XFRM_GSO_SEGMENT 16 1008 #define XFRM_GRO 32 1009 #define XFRM_ESP_NO_TRAILER 64 1010 #define XFRM_DEV_RESUME 128 1011 #define XFRM_XMIT 256 1012 1013 __u32 status; 1014 #define CRYPTO_SUCCESS 1 1015 #define CRYPTO_GENERIC_ERROR 2 1016 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4 1017 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8 1018 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16 1019 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32 1020 #define CRYPTO_INVALID_PACKET_SYNTAX 64 1021 #define CRYPTO_INVALID_PROTOCOL 128 1022 1023 __u8 proto; 1024 __u8 inner_ipproto; 1025 }; 1026 1027 struct sec_path { 1028 int len; 1029 int olen; 1030 1031 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 1032 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH]; 1033 }; 1034 1035 struct sec_path *secpath_set(struct sk_buff *skb); 1036 1037 static inline void 1038 secpath_reset(struct sk_buff *skb) 1039 { 1040 #ifdef CONFIG_XFRM 1041 skb_ext_del(skb, SKB_EXT_SEC_PATH); 1042 #endif 1043 } 1044 1045 static inline int 1046 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family) 1047 { 1048 switch (family) { 1049 case AF_INET: 1050 return addr->a4 == 0; 1051 case AF_INET6: 1052 return ipv6_addr_any(&addr->in6); 1053 } 1054 return 0; 1055 } 1056 1057 static inline int 1058 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1059 { 1060 return (tmpl->saddr.a4 && 1061 tmpl->saddr.a4 != x->props.saddr.a4); 1062 } 1063 1064 static inline int 1065 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1066 { 1067 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 1068 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 1069 } 1070 1071 static inline int 1072 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family) 1073 { 1074 switch (family) { 1075 case AF_INET: 1076 return __xfrm4_state_addr_cmp(tmpl, x); 1077 case AF_INET6: 1078 return __xfrm6_state_addr_cmp(tmpl, x); 1079 } 1080 return !0; 1081 } 1082 1083 #ifdef CONFIG_XFRM 1084 static inline bool 1085 xfrm_default_allow(struct net *net, int dir) 1086 { 1087 u8 def = net->xfrm.policy_default; 1088 1089 switch (dir) { 1090 case XFRM_POLICY_IN: 1091 return def & XFRM_POL_DEFAULT_IN ? false : true; 1092 case XFRM_POLICY_OUT: 1093 return def & XFRM_POL_DEFAULT_OUT ? false : true; 1094 case XFRM_POLICY_FWD: 1095 return def & XFRM_POL_DEFAULT_FWD ? false : true; 1096 } 1097 return false; 1098 } 1099 1100 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, 1101 unsigned short family); 1102 1103 static inline int __xfrm_policy_check2(struct sock *sk, int dir, 1104 struct sk_buff *skb, 1105 unsigned int family, int reverse) 1106 { 1107 struct net *net = dev_net(skb->dev); 1108 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); 1109 1110 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 1111 return __xfrm_policy_check(sk, ndir, skb, family); 1112 1113 if (xfrm_default_allow(net, dir)) 1114 return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) || 1115 (skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY)) || 1116 __xfrm_policy_check(sk, ndir, skb, family); 1117 else 1118 return (skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY)) || 1119 __xfrm_policy_check(sk, ndir, skb, family); 1120 } 1121 1122 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1123 { 1124 return __xfrm_policy_check2(sk, dir, skb, family, 0); 1125 } 1126 1127 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1128 { 1129 return xfrm_policy_check(sk, dir, skb, AF_INET); 1130 } 1131 1132 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1133 { 1134 return xfrm_policy_check(sk, dir, skb, AF_INET6); 1135 } 1136 1137 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1138 struct sk_buff *skb) 1139 { 1140 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); 1141 } 1142 1143 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1144 struct sk_buff *skb) 1145 { 1146 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); 1147 } 1148 1149 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1150 unsigned int family, int reverse); 1151 1152 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1153 unsigned int family) 1154 { 1155 return __xfrm_decode_session(skb, fl, family, 0); 1156 } 1157 1158 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1159 struct flowi *fl, 1160 unsigned int family) 1161 { 1162 return __xfrm_decode_session(skb, fl, family, 1); 1163 } 1164 1165 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 1166 1167 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 1168 { 1169 struct net *net = dev_net(skb->dev); 1170 1171 if (xfrm_default_allow(net, XFRM_POLICY_OUT)) 1172 return !net->xfrm.policy_count[XFRM_POLICY_OUT] || 1173 (skb_dst(skb)->flags & DST_NOXFRM) || 1174 __xfrm_route_forward(skb, family); 1175 else 1176 return (skb_dst(skb)->flags & DST_NOXFRM) || 1177 __xfrm_route_forward(skb, family); 1178 } 1179 1180 static inline int xfrm4_route_forward(struct sk_buff *skb) 1181 { 1182 return xfrm_route_forward(skb, AF_INET); 1183 } 1184 1185 static inline int xfrm6_route_forward(struct sk_buff *skb) 1186 { 1187 return xfrm_route_forward(skb, AF_INET6); 1188 } 1189 1190 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk); 1191 1192 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) 1193 { 1194 sk->sk_policy[0] = NULL; 1195 sk->sk_policy[1] = NULL; 1196 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1])) 1197 return __xfrm_sk_clone_policy(sk, osk); 1198 return 0; 1199 } 1200 1201 int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 1202 1203 static inline void xfrm_sk_free_policy(struct sock *sk) 1204 { 1205 struct xfrm_policy *pol; 1206 1207 pol = rcu_dereference_protected(sk->sk_policy[0], 1); 1208 if (unlikely(pol != NULL)) { 1209 xfrm_policy_delete(pol, XFRM_POLICY_MAX); 1210 sk->sk_policy[0] = NULL; 1211 } 1212 pol = rcu_dereference_protected(sk->sk_policy[1], 1); 1213 if (unlikely(pol != NULL)) { 1214 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1); 1215 sk->sk_policy[1] = NULL; 1216 } 1217 } 1218 1219 #else 1220 1221 static inline void xfrm_sk_free_policy(struct sock *sk) {} 1222 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; } 1223 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 1224 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 1225 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1226 { 1227 return 1; 1228 } 1229 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1230 { 1231 return 1; 1232 } 1233 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1234 { 1235 return 1; 1236 } 1237 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1238 struct flowi *fl, 1239 unsigned int family) 1240 { 1241 return -ENOSYS; 1242 } 1243 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1244 struct sk_buff *skb) 1245 { 1246 return 1; 1247 } 1248 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1249 struct sk_buff *skb) 1250 { 1251 return 1; 1252 } 1253 #endif 1254 1255 static __inline__ 1256 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family) 1257 { 1258 switch (family){ 1259 case AF_INET: 1260 return (xfrm_address_t *)&fl->u.ip4.daddr; 1261 case AF_INET6: 1262 return (xfrm_address_t *)&fl->u.ip6.daddr; 1263 } 1264 return NULL; 1265 } 1266 1267 static __inline__ 1268 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family) 1269 { 1270 switch (family){ 1271 case AF_INET: 1272 return (xfrm_address_t *)&fl->u.ip4.saddr; 1273 case AF_INET6: 1274 return (xfrm_address_t *)&fl->u.ip6.saddr; 1275 } 1276 return NULL; 1277 } 1278 1279 static __inline__ 1280 void xfrm_flowi_addr_get(const struct flowi *fl, 1281 xfrm_address_t *saddr, xfrm_address_t *daddr, 1282 unsigned short family) 1283 { 1284 switch(family) { 1285 case AF_INET: 1286 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4)); 1287 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4)); 1288 break; 1289 case AF_INET6: 1290 saddr->in6 = fl->u.ip6.saddr; 1291 daddr->in6 = fl->u.ip6.daddr; 1292 break; 1293 } 1294 } 1295 1296 static __inline__ int 1297 __xfrm4_state_addr_check(const struct xfrm_state *x, 1298 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1299 { 1300 if (daddr->a4 == x->id.daddr.a4 && 1301 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 1302 return 1; 1303 return 0; 1304 } 1305 1306 static __inline__ int 1307 __xfrm6_state_addr_check(const struct xfrm_state *x, 1308 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1309 { 1310 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 1311 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) || 1312 ipv6_addr_any((struct in6_addr *)saddr) || 1313 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 1314 return 1; 1315 return 0; 1316 } 1317 1318 static __inline__ int 1319 xfrm_state_addr_check(const struct xfrm_state *x, 1320 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1321 unsigned short family) 1322 { 1323 switch (family) { 1324 case AF_INET: 1325 return __xfrm4_state_addr_check(x, daddr, saddr); 1326 case AF_INET6: 1327 return __xfrm6_state_addr_check(x, daddr, saddr); 1328 } 1329 return 0; 1330 } 1331 1332 static __inline__ int 1333 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl, 1334 unsigned short family) 1335 { 1336 switch (family) { 1337 case AF_INET: 1338 return __xfrm4_state_addr_check(x, 1339 (const xfrm_address_t *)&fl->u.ip4.daddr, 1340 (const xfrm_address_t *)&fl->u.ip4.saddr); 1341 case AF_INET6: 1342 return __xfrm6_state_addr_check(x, 1343 (const xfrm_address_t *)&fl->u.ip6.daddr, 1344 (const xfrm_address_t *)&fl->u.ip6.saddr); 1345 } 1346 return 0; 1347 } 1348 1349 static inline int xfrm_state_kern(const struct xfrm_state *x) 1350 { 1351 return atomic_read(&x->tunnel_users); 1352 } 1353 1354 static inline bool xfrm_id_proto_valid(u8 proto) 1355 { 1356 switch (proto) { 1357 case IPPROTO_AH: 1358 case IPPROTO_ESP: 1359 case IPPROTO_COMP: 1360 #if IS_ENABLED(CONFIG_IPV6) 1361 case IPPROTO_ROUTING: 1362 case IPPROTO_DSTOPTS: 1363 #endif 1364 return true; 1365 default: 1366 return false; 1367 } 1368 } 1369 1370 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */ 1371 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 1372 { 1373 return (!userproto || proto == userproto || 1374 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 1375 proto == IPPROTO_ESP || 1376 proto == IPPROTO_COMP))); 1377 } 1378 1379 /* 1380 * xfrm algorithm information 1381 */ 1382 struct xfrm_algo_aead_info { 1383 char *geniv; 1384 u16 icv_truncbits; 1385 }; 1386 1387 struct xfrm_algo_auth_info { 1388 u16 icv_truncbits; 1389 u16 icv_fullbits; 1390 }; 1391 1392 struct xfrm_algo_encr_info { 1393 char *geniv; 1394 u16 blockbits; 1395 u16 defkeybits; 1396 }; 1397 1398 struct xfrm_algo_comp_info { 1399 u16 threshold; 1400 }; 1401 1402 struct xfrm_algo_desc { 1403 char *name; 1404 char *compat; 1405 u8 available:1; 1406 u8 pfkey_supported:1; 1407 union { 1408 struct xfrm_algo_aead_info aead; 1409 struct xfrm_algo_auth_info auth; 1410 struct xfrm_algo_encr_info encr; 1411 struct xfrm_algo_comp_info comp; 1412 } uinfo; 1413 struct sadb_alg desc; 1414 }; 1415 1416 /* XFRM protocol handlers. */ 1417 struct xfrm4_protocol { 1418 int (*handler)(struct sk_buff *skb); 1419 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1420 int encap_type); 1421 int (*cb_handler)(struct sk_buff *skb, int err); 1422 int (*err_handler)(struct sk_buff *skb, u32 info); 1423 1424 struct xfrm4_protocol __rcu *next; 1425 int priority; 1426 }; 1427 1428 struct xfrm6_protocol { 1429 int (*handler)(struct sk_buff *skb); 1430 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1431 int encap_type); 1432 int (*cb_handler)(struct sk_buff *skb, int err); 1433 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1434 u8 type, u8 code, int offset, __be32 info); 1435 1436 struct xfrm6_protocol __rcu *next; 1437 int priority; 1438 }; 1439 1440 /* XFRM tunnel handlers. */ 1441 struct xfrm_tunnel { 1442 int (*handler)(struct sk_buff *skb); 1443 int (*cb_handler)(struct sk_buff *skb, int err); 1444 int (*err_handler)(struct sk_buff *skb, u32 info); 1445 1446 struct xfrm_tunnel __rcu *next; 1447 int priority; 1448 }; 1449 1450 struct xfrm6_tunnel { 1451 int (*handler)(struct sk_buff *skb); 1452 int (*cb_handler)(struct sk_buff *skb, int err); 1453 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1454 u8 type, u8 code, int offset, __be32 info); 1455 struct xfrm6_tunnel __rcu *next; 1456 int priority; 1457 }; 1458 1459 void xfrm_init(void); 1460 void xfrm4_init(void); 1461 int xfrm_state_init(struct net *net); 1462 void xfrm_state_fini(struct net *net); 1463 void xfrm4_state_init(void); 1464 void xfrm4_protocol_init(void); 1465 #ifdef CONFIG_XFRM 1466 int xfrm6_init(void); 1467 void xfrm6_fini(void); 1468 int xfrm6_state_init(void); 1469 void xfrm6_state_fini(void); 1470 int xfrm6_protocol_init(void); 1471 void xfrm6_protocol_fini(void); 1472 #else 1473 static inline int xfrm6_init(void) 1474 { 1475 return 0; 1476 } 1477 static inline void xfrm6_fini(void) 1478 { 1479 ; 1480 } 1481 #endif 1482 1483 #ifdef CONFIG_XFRM_STATISTICS 1484 int xfrm_proc_init(struct net *net); 1485 void xfrm_proc_fini(struct net *net); 1486 #endif 1487 1488 int xfrm_sysctl_init(struct net *net); 1489 #ifdef CONFIG_SYSCTL 1490 void xfrm_sysctl_fini(struct net *net); 1491 #else 1492 static inline void xfrm_sysctl_fini(struct net *net) 1493 { 1494 } 1495 #endif 1496 1497 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 1498 struct xfrm_address_filter *filter); 1499 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1500 int (*func)(struct xfrm_state *, int, void*), void *); 1501 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net); 1502 struct xfrm_state *xfrm_state_alloc(struct net *net); 1503 void xfrm_state_free(struct xfrm_state *x); 1504 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr, 1505 const xfrm_address_t *saddr, 1506 const struct flowi *fl, 1507 struct xfrm_tmpl *tmpl, 1508 struct xfrm_policy *pol, int *err, 1509 unsigned short family, u32 if_id); 1510 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id, 1511 xfrm_address_t *daddr, 1512 xfrm_address_t *saddr, 1513 unsigned short family, 1514 u8 mode, u8 proto, u32 reqid); 1515 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1516 unsigned short family); 1517 int xfrm_state_check_expire(struct xfrm_state *x); 1518 void xfrm_state_insert(struct xfrm_state *x); 1519 int xfrm_state_add(struct xfrm_state *x); 1520 int xfrm_state_update(struct xfrm_state *x); 1521 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark, 1522 const xfrm_address_t *daddr, __be32 spi, 1523 u8 proto, unsigned short family); 1524 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1525 const xfrm_address_t *daddr, 1526 const xfrm_address_t *saddr, 1527 u8 proto, 1528 unsigned short family); 1529 #ifdef CONFIG_XFRM_SUB_POLICY 1530 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1531 unsigned short family); 1532 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1533 unsigned short family); 1534 #else 1535 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s, 1536 int n, unsigned short family) 1537 { 1538 } 1539 1540 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s, 1541 int n, unsigned short family) 1542 { 1543 } 1544 #endif 1545 1546 struct xfrmk_sadinfo { 1547 u32 sadhcnt; /* current hash bkts */ 1548 u32 sadhmcnt; /* max allowed hash bkts */ 1549 u32 sadcnt; /* current running count */ 1550 }; 1551 1552 struct xfrmk_spdinfo { 1553 u32 incnt; 1554 u32 outcnt; 1555 u32 fwdcnt; 1556 u32 inscnt; 1557 u32 outscnt; 1558 u32 fwdscnt; 1559 u32 spdhcnt; 1560 u32 spdhmcnt; 1561 }; 1562 1563 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1564 int xfrm_state_delete(struct xfrm_state *x); 1565 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync); 1566 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid); 1567 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); 1568 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); 1569 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq); 1570 int xfrm_init_replay(struct xfrm_state *x); 1571 u32 __xfrm_state_mtu(struct xfrm_state *x, int mtu); 1572 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu); 1573 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload); 1574 int xfrm_init_state(struct xfrm_state *x); 1575 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type); 1576 int xfrm_input_resume(struct sk_buff *skb, int nexthdr); 1577 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb, 1578 int (*finish)(struct net *, struct sock *, 1579 struct sk_buff *)); 1580 int xfrm_trans_queue(struct sk_buff *skb, 1581 int (*finish)(struct net *, struct sock *, 1582 struct sk_buff *)); 1583 int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err); 1584 int xfrm_output(struct sock *sk, struct sk_buff *skb); 1585 1586 #if IS_ENABLED(CONFIG_NET_PKTGEN) 1587 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb); 1588 #endif 1589 1590 void xfrm_local_error(struct sk_buff *skb, int mtu); 1591 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1592 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1593 int encap_type); 1594 int xfrm4_transport_finish(struct sk_buff *skb, int async); 1595 int xfrm4_rcv(struct sk_buff *skb); 1596 1597 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1598 { 1599 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL; 1600 XFRM_SPI_SKB_CB(skb)->family = AF_INET; 1601 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); 1602 return xfrm_input(skb, nexthdr, spi, 0); 1603 } 1604 1605 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1606 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol); 1607 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol); 1608 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1609 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1610 void xfrm4_local_error(struct sk_buff *skb, u32 mtu); 1611 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1612 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi, 1613 struct ip6_tnl *t); 1614 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1615 int encap_type); 1616 int xfrm6_transport_finish(struct sk_buff *skb, int async); 1617 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t); 1618 int xfrm6_rcv(struct sk_buff *skb); 1619 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1620 xfrm_address_t *saddr, u8 proto); 1621 void xfrm6_local_error(struct sk_buff *skb, u32 mtu); 1622 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol); 1623 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol); 1624 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1625 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1626 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr); 1627 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr); 1628 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1629 1630 #ifdef CONFIG_XFRM 1631 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu); 1632 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1633 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1634 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, 1635 int optlen); 1636 #else 1637 static inline int xfrm_user_policy(struct sock *sk, int optname, 1638 sockptr_t optval, int optlen) 1639 { 1640 return -ENOPROTOOPT; 1641 } 1642 #endif 1643 1644 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif, 1645 const xfrm_address_t *saddr, 1646 const xfrm_address_t *daddr, 1647 int family, u32 mark); 1648 1649 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); 1650 1651 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); 1652 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, 1653 int (*func)(struct xfrm_policy *, int, int, void*), 1654 void *); 1655 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net); 1656 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1657 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, 1658 const struct xfrm_mark *mark, 1659 u32 if_id, u8 type, int dir, 1660 struct xfrm_selector *sel, 1661 struct xfrm_sec_ctx *ctx, int delete, 1662 int *err); 1663 struct xfrm_policy *xfrm_policy_byid(struct net *net, 1664 const struct xfrm_mark *mark, u32 if_id, 1665 u8 type, int dir, u32 id, int delete, 1666 int *err); 1667 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid); 1668 void xfrm_policy_hash_rebuild(struct net *net); 1669 u32 xfrm_get_acqseq(void); 1670 int verify_spi_info(u8 proto, u32 min, u32 max); 1671 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 1672 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, 1673 u8 mode, u32 reqid, u32 if_id, u8 proto, 1674 const xfrm_address_t *daddr, 1675 const xfrm_address_t *saddr, int create, 1676 unsigned short family); 1677 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1678 1679 #ifdef CONFIG_XFRM_MIGRATE 1680 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1681 const struct xfrm_migrate *m, int num_bundles, 1682 const struct xfrm_kmaddress *k, 1683 const struct xfrm_encap_tmpl *encap); 1684 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net); 1685 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 1686 struct xfrm_migrate *m, 1687 struct xfrm_encap_tmpl *encap); 1688 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1689 struct xfrm_migrate *m, int num_bundles, 1690 struct xfrm_kmaddress *k, struct net *net, 1691 struct xfrm_encap_tmpl *encap); 1692 #endif 1693 1694 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1695 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid); 1696 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, 1697 xfrm_address_t *addr); 1698 1699 void xfrm_input_init(void); 1700 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1701 1702 void xfrm_probe_algs(void); 1703 int xfrm_count_pfkey_auth_supported(void); 1704 int xfrm_count_pfkey_enc_supported(void); 1705 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1706 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1707 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1708 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1709 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1710 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe); 1711 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe); 1712 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe); 1713 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, 1714 int probe); 1715 1716 static inline bool xfrm6_addr_equal(const xfrm_address_t *a, 1717 const xfrm_address_t *b) 1718 { 1719 return ipv6_addr_equal((const struct in6_addr *)a, 1720 (const struct in6_addr *)b); 1721 } 1722 1723 static inline bool xfrm_addr_equal(const xfrm_address_t *a, 1724 const xfrm_address_t *b, 1725 sa_family_t family) 1726 { 1727 switch (family) { 1728 default: 1729 case AF_INET: 1730 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0; 1731 case AF_INET6: 1732 return xfrm6_addr_equal(a, b); 1733 } 1734 } 1735 1736 static inline int xfrm_policy_id2dir(u32 index) 1737 { 1738 return index & 7; 1739 } 1740 1741 #ifdef CONFIG_XFRM 1742 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq); 1743 int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq); 1744 void xfrm_replay_notify(struct xfrm_state *x, int event); 1745 int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb); 1746 int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq); 1747 1748 static inline int xfrm_aevent_is_on(struct net *net) 1749 { 1750 struct sock *nlsk; 1751 int ret = 0; 1752 1753 rcu_read_lock(); 1754 nlsk = rcu_dereference(net->xfrm.nlsk); 1755 if (nlsk) 1756 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1757 rcu_read_unlock(); 1758 return ret; 1759 } 1760 1761 static inline int xfrm_acquire_is_on(struct net *net) 1762 { 1763 struct sock *nlsk; 1764 int ret = 0; 1765 1766 rcu_read_lock(); 1767 nlsk = rcu_dereference(net->xfrm.nlsk); 1768 if (nlsk) 1769 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE); 1770 rcu_read_unlock(); 1771 1772 return ret; 1773 } 1774 #endif 1775 1776 static inline unsigned int aead_len(struct xfrm_algo_aead *alg) 1777 { 1778 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1779 } 1780 1781 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg) 1782 { 1783 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1784 } 1785 1786 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg) 1787 { 1788 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1789 } 1790 1791 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn) 1792 { 1793 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32); 1794 } 1795 1796 #ifdef CONFIG_XFRM_MIGRATE 1797 static inline int xfrm_replay_clone(struct xfrm_state *x, 1798 struct xfrm_state *orig) 1799 { 1800 1801 x->replay_esn = kmemdup(orig->replay_esn, 1802 xfrm_replay_state_esn_len(orig->replay_esn), 1803 GFP_KERNEL); 1804 if (!x->replay_esn) 1805 return -ENOMEM; 1806 x->preplay_esn = kmemdup(orig->preplay_esn, 1807 xfrm_replay_state_esn_len(orig->preplay_esn), 1808 GFP_KERNEL); 1809 if (!x->preplay_esn) 1810 return -ENOMEM; 1811 1812 return 0; 1813 } 1814 1815 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig) 1816 { 1817 return kmemdup(orig, aead_len(orig), GFP_KERNEL); 1818 } 1819 1820 1821 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1822 { 1823 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); 1824 } 1825 1826 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig) 1827 { 1828 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL); 1829 } 1830 1831 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1832 { 1833 int i; 1834 for (i = 0; i < n; i++) 1835 xfrm_state_put(*(states + i)); 1836 } 1837 1838 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1839 { 1840 int i; 1841 for (i = 0; i < n; i++) 1842 xfrm_state_delete(*(states + i)); 1843 } 1844 #endif 1845 1846 #ifdef CONFIG_XFRM 1847 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) 1848 { 1849 struct sec_path *sp = skb_sec_path(skb); 1850 1851 return sp->xvec[sp->len - 1]; 1852 } 1853 #endif 1854 1855 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb) 1856 { 1857 #ifdef CONFIG_XFRM 1858 struct sec_path *sp = skb_sec_path(skb); 1859 1860 if (!sp || !sp->olen || sp->len != sp->olen) 1861 return NULL; 1862 1863 return &sp->ovec[sp->olen - 1]; 1864 #else 1865 return NULL; 1866 #endif 1867 } 1868 1869 void __init xfrm_dev_init(void); 1870 1871 #ifdef CONFIG_XFRM_OFFLOAD 1872 void xfrm_dev_resume(struct sk_buff *skb); 1873 void xfrm_dev_backlog(struct softnet_data *sd); 1874 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again); 1875 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, 1876 struct xfrm_user_offload *xuo); 1877 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x); 1878 1879 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 1880 { 1881 struct xfrm_state_offload *xso = &x->xso; 1882 1883 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn) 1884 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x); 1885 } 1886 1887 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 1888 { 1889 struct xfrm_state *x = dst->xfrm; 1890 struct xfrm_dst *xdst; 1891 1892 if (!x || !x->type_offload) 1893 return false; 1894 1895 xdst = (struct xfrm_dst *) dst; 1896 if (!x->xso.offload_handle && !xdst->child->xfrm) 1897 return true; 1898 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) && 1899 !xdst->child->xfrm) 1900 return true; 1901 1902 return false; 1903 } 1904 1905 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 1906 { 1907 struct xfrm_state_offload *xso = &x->xso; 1908 1909 if (xso->dev) 1910 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x); 1911 } 1912 1913 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1914 { 1915 struct xfrm_state_offload *xso = &x->xso; 1916 struct net_device *dev = xso->dev; 1917 1918 if (dev && dev->xfrmdev_ops) { 1919 if (dev->xfrmdev_ops->xdo_dev_state_free) 1920 dev->xfrmdev_ops->xdo_dev_state_free(x); 1921 xso->dev = NULL; 1922 dev_put_track(dev, &xso->dev_tracker); 1923 } 1924 } 1925 #else 1926 static inline void xfrm_dev_resume(struct sk_buff *skb) 1927 { 1928 } 1929 1930 static inline void xfrm_dev_backlog(struct softnet_data *sd) 1931 { 1932 } 1933 1934 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again) 1935 { 1936 return skb; 1937 } 1938 1939 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo) 1940 { 1941 return 0; 1942 } 1943 1944 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 1945 { 1946 } 1947 1948 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1949 { 1950 } 1951 1952 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) 1953 { 1954 return false; 1955 } 1956 1957 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 1958 { 1959 } 1960 1961 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 1962 { 1963 return false; 1964 } 1965 #endif 1966 1967 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) 1968 { 1969 if (attrs[XFRMA_MARK]) 1970 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark)); 1971 else 1972 m->v = m->m = 0; 1973 1974 return m->v & m->m; 1975 } 1976 1977 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m) 1978 { 1979 int ret = 0; 1980 1981 if (m->m | m->v) 1982 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); 1983 return ret; 1984 } 1985 1986 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x) 1987 { 1988 struct xfrm_mark *m = &x->props.smark; 1989 1990 return (m->v & m->m) | (mark & ~m->m); 1991 } 1992 1993 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id) 1994 { 1995 int ret = 0; 1996 1997 if (if_id) 1998 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id); 1999 return ret; 2000 } 2001 2002 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x, 2003 unsigned int family) 2004 { 2005 bool tunnel = false; 2006 2007 switch(family) { 2008 case AF_INET: 2009 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) 2010 tunnel = true; 2011 break; 2012 case AF_INET6: 2013 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) 2014 tunnel = true; 2015 break; 2016 } 2017 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL)) 2018 return -EINVAL; 2019 2020 return 0; 2021 } 2022 2023 extern const int xfrm_msg_min[XFRM_NR_MSGTYPES]; 2024 extern const struct nla_policy xfrma_policy[XFRMA_MAX+1]; 2025 2026 struct xfrm_translator { 2027 /* Allocate frag_list and put compat translation there */ 2028 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src); 2029 2030 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */ 2031 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh, 2032 int maxtype, const struct nla_policy *policy, 2033 struct netlink_ext_ack *extack); 2034 2035 /* Translate 32-bit user_policy from sockptr */ 2036 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen); 2037 2038 struct module *owner; 2039 }; 2040 2041 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT) 2042 extern int xfrm_register_translator(struct xfrm_translator *xtr); 2043 extern int xfrm_unregister_translator(struct xfrm_translator *xtr); 2044 extern struct xfrm_translator *xfrm_get_translator(void); 2045 extern void xfrm_put_translator(struct xfrm_translator *xtr); 2046 #else 2047 static inline struct xfrm_translator *xfrm_get_translator(void) 2048 { 2049 return NULL; 2050 } 2051 static inline void xfrm_put_translator(struct xfrm_translator *xtr) 2052 { 2053 } 2054 #endif 2055 2056 #if IS_ENABLED(CONFIG_IPV6) 2057 static inline bool xfrm6_local_dontfrag(const struct sock *sk) 2058 { 2059 int proto; 2060 2061 if (!sk || sk->sk_family != AF_INET6) 2062 return false; 2063 2064 proto = sk->sk_protocol; 2065 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW) 2066 return inet6_sk(sk)->dontfrag; 2067 2068 return false; 2069 } 2070 #endif 2071 #endif /* _NET_XFRM_H */ 2072