1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _NET_XFRM_H 3 #define _NET_XFRM_H 4 5 #include <linux/compiler.h> 6 #include <linux/xfrm.h> 7 #include <linux/spinlock.h> 8 #include <linux/list.h> 9 #include <linux/skbuff.h> 10 #include <linux/socket.h> 11 #include <linux/pfkeyv2.h> 12 #include <linux/ipsec.h> 13 #include <linux/in6.h> 14 #include <linux/mutex.h> 15 #include <linux/audit.h> 16 #include <linux/slab.h> 17 #include <linux/refcount.h> 18 #include <linux/sockptr.h> 19 20 #include <net/sock.h> 21 #include <net/dst.h> 22 #include <net/ip.h> 23 #include <net/route.h> 24 #include <net/ipv6.h> 25 #include <net/ip6_fib.h> 26 #include <net/flow.h> 27 #include <net/gro_cells.h> 28 29 #include <linux/interrupt.h> 30 31 #ifdef CONFIG_XFRM_STATISTICS 32 #include <net/snmp.h> 33 #endif 34 35 #define XFRM_PROTO_ESP 50 36 #define XFRM_PROTO_AH 51 37 #define XFRM_PROTO_COMP 108 38 #define XFRM_PROTO_IPIP 4 39 #define XFRM_PROTO_IPV6 41 40 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING 41 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS 42 43 #define XFRM_ALIGN4(len) (((len) + 3) & ~3) 44 #define XFRM_ALIGN8(len) (((len) + 7) & ~7) 45 #define MODULE_ALIAS_XFRM_MODE(family, encap) \ 46 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap)) 47 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \ 48 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto)) 49 #define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \ 50 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto)) 51 52 #ifdef CONFIG_XFRM_STATISTICS 53 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field) 54 #else 55 #define XFRM_INC_STATS(net, field) ((void)(net)) 56 #endif 57 58 59 /* Organization of SPD aka "XFRM rules" 60 ------------------------------------ 61 62 Basic objects: 63 - policy rule, struct xfrm_policy (=SPD entry) 64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) 65 - instance of a transformer, struct xfrm_state (=SA) 66 - template to clone xfrm_state, struct xfrm_tmpl 67 68 SPD is plain linear list of xfrm_policy rules, ordered by priority. 69 (To be compatible with existing pfkeyv2 implementations, 70 many rules with priority of 0x7fffffff are allowed to exist and 71 such rules are ordered in an unpredictable way, thanks to bsd folks.) 72 73 Lookup is plain linear search until the first match with selector. 74 75 If "action" is "block", then we prohibit the flow, otherwise: 76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, 77 policy entry has list of up to XFRM_MAX_DEPTH transformations, 78 described by templates xfrm_tmpl. Each template is resolved 79 to a complete xfrm_state (see below) and we pack bundle of transformations 80 to a dst_entry returned to requestor. 81 82 dst -. xfrm .-> xfrm_state #1 83 |---. child .-> dst -. xfrm .-> xfrm_state #2 84 |---. child .-> dst -. xfrm .-> xfrm_state #3 85 |---. child .-> NULL 86 87 Bundles are cached at xrfm_policy struct (field ->bundles). 88 89 90 Resolution of xrfm_tmpl 91 ----------------------- 92 Template contains: 93 1. ->mode Mode: transport or tunnel 94 2. ->id.proto Protocol: AH/ESP/IPCOMP 95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. 96 Q: allow to resolve security gateway? 97 4. ->id.spi If not zero, static SPI. 98 5. ->saddr Local tunnel endpoint, ignored for transport mode. 99 6. ->algos List of allowed algos. Plain bitmask now. 100 Q: ealgos, aalgos, calgos. What a mess... 101 7. ->share Sharing mode. 102 Q: how to implement private sharing mode? To add struct sock* to 103 flow id? 104 105 Having this template we search through SAD searching for entries 106 with appropriate mode/proto/algo, permitted by selector. 107 If no appropriate entry found, it is requested from key manager. 108 109 PROBLEMS: 110 Q: How to find all the bundles referring to a physical path for 111 PMTU discovery? Seems, dst should contain list of all parents... 112 and enter to infinite locking hierarchy disaster. 113 No! It is easier, we will not search for them, let them find us. 114 We add genid to each dst plus pointer to genid of raw IP route, 115 pmtu disc will update pmtu on raw IP route and increase its genid. 116 dst_check() will see this for top level and trigger resyncing 117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved. 118 */ 119 120 struct xfrm_state_walk { 121 struct list_head all; 122 u8 state; 123 u8 dying; 124 u8 proto; 125 u32 seq; 126 struct xfrm_address_filter *filter; 127 }; 128 129 enum { 130 XFRM_DEV_OFFLOAD_IN = 1, 131 XFRM_DEV_OFFLOAD_OUT, 132 }; 133 134 struct xfrm_dev_offload { 135 struct net_device *dev; 136 netdevice_tracker dev_tracker; 137 struct net_device *real_dev; 138 unsigned long offload_handle; 139 u8 dir : 2; 140 }; 141 142 struct xfrm_mode { 143 u8 encap; 144 u8 family; 145 u8 flags; 146 }; 147 148 /* Flags for xfrm_mode. */ 149 enum { 150 XFRM_MODE_FLAG_TUNNEL = 1, 151 }; 152 153 enum xfrm_replay_mode { 154 XFRM_REPLAY_MODE_LEGACY, 155 XFRM_REPLAY_MODE_BMP, 156 XFRM_REPLAY_MODE_ESN, 157 }; 158 159 /* Full description of state of transformer. */ 160 struct xfrm_state { 161 possible_net_t xs_net; 162 union { 163 struct hlist_node gclist; 164 struct hlist_node bydst; 165 }; 166 struct hlist_node bysrc; 167 struct hlist_node byspi; 168 struct hlist_node byseq; 169 170 refcount_t refcnt; 171 spinlock_t lock; 172 173 struct xfrm_id id; 174 struct xfrm_selector sel; 175 struct xfrm_mark mark; 176 u32 if_id; 177 u32 tfcpad; 178 179 u32 genid; 180 181 /* Key manager bits */ 182 struct xfrm_state_walk km; 183 184 /* Parameters of this state. */ 185 struct { 186 u32 reqid; 187 u8 mode; 188 u8 replay_window; 189 u8 aalgo, ealgo, calgo; 190 u8 flags; 191 u16 family; 192 xfrm_address_t saddr; 193 int header_len; 194 int trailer_len; 195 u32 extra_flags; 196 struct xfrm_mark smark; 197 } props; 198 199 struct xfrm_lifetime_cfg lft; 200 201 /* Data for transformer */ 202 struct xfrm_algo_auth *aalg; 203 struct xfrm_algo *ealg; 204 struct xfrm_algo *calg; 205 struct xfrm_algo_aead *aead; 206 const char *geniv; 207 208 /* mapping change rate limiting */ 209 __be16 new_mapping_sport; 210 u32 new_mapping; /* seconds */ 211 u32 mapping_maxage; /* seconds for input SA */ 212 213 /* Data for encapsulator */ 214 struct xfrm_encap_tmpl *encap; 215 struct sock __rcu *encap_sk; 216 217 /* Data for care-of address */ 218 xfrm_address_t *coaddr; 219 220 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 221 struct xfrm_state *tunnel; 222 223 /* If a tunnel, number of users + 1 */ 224 atomic_t tunnel_users; 225 226 /* State for replay detection */ 227 struct xfrm_replay_state replay; 228 struct xfrm_replay_state_esn *replay_esn; 229 230 /* Replay detection state at the time we sent the last notification */ 231 struct xfrm_replay_state preplay; 232 struct xfrm_replay_state_esn *preplay_esn; 233 234 /* replay detection mode */ 235 enum xfrm_replay_mode repl_mode; 236 /* internal flag that only holds state for delayed aevent at the 237 * moment 238 */ 239 u32 xflags; 240 241 /* Replay detection notification settings */ 242 u32 replay_maxage; 243 u32 replay_maxdiff; 244 245 /* Replay detection notification timer */ 246 struct timer_list rtimer; 247 248 /* Statistics */ 249 struct xfrm_stats stats; 250 251 struct xfrm_lifetime_cur curlft; 252 struct hrtimer mtimer; 253 254 struct xfrm_dev_offload xso; 255 256 /* used to fix curlft->add_time when changing date */ 257 long saved_tmo; 258 259 /* Last used time */ 260 time64_t lastused; 261 262 struct page_frag xfrag; 263 264 /* Reference to data common to all the instances of this 265 * transformer. */ 266 const struct xfrm_type *type; 267 struct xfrm_mode inner_mode; 268 struct xfrm_mode inner_mode_iaf; 269 struct xfrm_mode outer_mode; 270 271 const struct xfrm_type_offload *type_offload; 272 273 /* Security context */ 274 struct xfrm_sec_ctx *security; 275 276 /* Private data of this transformer, format is opaque, 277 * interpreted by xfrm_type methods. */ 278 void *data; 279 }; 280 281 static inline struct net *xs_net(struct xfrm_state *x) 282 { 283 return read_pnet(&x->xs_net); 284 } 285 286 /* xflags - make enum if more show up */ 287 #define XFRM_TIME_DEFER 1 288 #define XFRM_SOFT_EXPIRE 2 289 290 enum { 291 XFRM_STATE_VOID, 292 XFRM_STATE_ACQ, 293 XFRM_STATE_VALID, 294 XFRM_STATE_ERROR, 295 XFRM_STATE_EXPIRED, 296 XFRM_STATE_DEAD 297 }; 298 299 /* callback structure passed from either netlink or pfkey */ 300 struct km_event { 301 union { 302 u32 hard; 303 u32 proto; 304 u32 byid; 305 u32 aevent; 306 u32 type; 307 } data; 308 309 u32 seq; 310 u32 portid; 311 u32 event; 312 struct net *net; 313 }; 314 315 struct xfrm_if_cb { 316 struct xfrm_if *(*decode_session)(struct sk_buff *skb, 317 unsigned short family); 318 }; 319 320 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb); 321 void xfrm_if_unregister_cb(void); 322 323 struct net_device; 324 struct xfrm_type; 325 struct xfrm_dst; 326 struct xfrm_policy_afinfo { 327 struct dst_ops *dst_ops; 328 struct dst_entry *(*dst_lookup)(struct net *net, 329 int tos, int oif, 330 const xfrm_address_t *saddr, 331 const xfrm_address_t *daddr, 332 u32 mark); 333 int (*get_saddr)(struct net *net, int oif, 334 xfrm_address_t *saddr, 335 xfrm_address_t *daddr, 336 u32 mark); 337 int (*fill_dst)(struct xfrm_dst *xdst, 338 struct net_device *dev, 339 const struct flowi *fl); 340 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig); 341 }; 342 343 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family); 344 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo); 345 void km_policy_notify(struct xfrm_policy *xp, int dir, 346 const struct km_event *c); 347 void km_state_notify(struct xfrm_state *x, const struct km_event *c); 348 349 struct xfrm_tmpl; 350 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, 351 struct xfrm_policy *pol); 352 void km_state_expired(struct xfrm_state *x, int hard, u32 portid); 353 int __xfrm_state_delete(struct xfrm_state *x); 354 355 struct xfrm_state_afinfo { 356 u8 family; 357 u8 proto; 358 359 const struct xfrm_type_offload *type_offload_esp; 360 361 const struct xfrm_type *type_esp; 362 const struct xfrm_type *type_ipip; 363 const struct xfrm_type *type_ipip6; 364 const struct xfrm_type *type_comp; 365 const struct xfrm_type *type_ah; 366 const struct xfrm_type *type_routing; 367 const struct xfrm_type *type_dstopts; 368 369 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb); 370 int (*transport_finish)(struct sk_buff *skb, 371 int async); 372 void (*local_error)(struct sk_buff *skb, u32 mtu); 373 }; 374 375 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 376 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 377 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); 378 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family); 379 380 struct xfrm_input_afinfo { 381 u8 family; 382 bool is_ipip; 383 int (*callback)(struct sk_buff *skb, u8 protocol, 384 int err); 385 }; 386 387 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo); 388 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo); 389 390 void xfrm_flush_gc(void); 391 void xfrm_state_delete_tunnel(struct xfrm_state *x); 392 393 struct xfrm_type { 394 struct module *owner; 395 u8 proto; 396 u8 flags; 397 #define XFRM_TYPE_NON_FRAGMENT 1 398 #define XFRM_TYPE_REPLAY_PROT 2 399 #define XFRM_TYPE_LOCAL_COADDR 4 400 #define XFRM_TYPE_REMOTE_COADDR 8 401 402 int (*init_state)(struct xfrm_state *x); 403 void (*destructor)(struct xfrm_state *); 404 int (*input)(struct xfrm_state *, struct sk_buff *skb); 405 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 406 int (*reject)(struct xfrm_state *, struct sk_buff *, 407 const struct flowi *); 408 }; 409 410 int xfrm_register_type(const struct xfrm_type *type, unsigned short family); 411 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); 412 413 struct xfrm_type_offload { 414 struct module *owner; 415 u8 proto; 416 void (*encap)(struct xfrm_state *, struct sk_buff *pskb); 417 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb); 418 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features); 419 }; 420 421 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family); 422 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family); 423 424 static inline int xfrm_af2proto(unsigned int family) 425 { 426 switch(family) { 427 case AF_INET: 428 return IPPROTO_IPIP; 429 case AF_INET6: 430 return IPPROTO_IPV6; 431 default: 432 return 0; 433 } 434 } 435 436 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto) 437 { 438 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) || 439 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6)) 440 return &x->inner_mode; 441 else 442 return &x->inner_mode_iaf; 443 } 444 445 struct xfrm_tmpl { 446 /* id in template is interpreted as: 447 * daddr - destination of tunnel, may be zero for transport mode. 448 * spi - zero to acquire spi. Not zero if spi is static, then 449 * daddr must be fixed too. 450 * proto - AH/ESP/IPCOMP 451 */ 452 struct xfrm_id id; 453 454 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 455 xfrm_address_t saddr; 456 457 unsigned short encap_family; 458 459 u32 reqid; 460 461 /* Mode: transport, tunnel etc. */ 462 u8 mode; 463 464 /* Sharing mode: unique, this session only, this user only etc. */ 465 u8 share; 466 467 /* May skip this transfomration if no SA is found */ 468 u8 optional; 469 470 /* Skip aalgos/ealgos/calgos checks. */ 471 u8 allalgs; 472 473 /* Bit mask of algos allowed for acquisition */ 474 u32 aalgos; 475 u32 ealgos; 476 u32 calgos; 477 }; 478 479 #define XFRM_MAX_DEPTH 6 480 #define XFRM_MAX_OFFLOAD_DEPTH 1 481 482 struct xfrm_policy_walk_entry { 483 struct list_head all; 484 u8 dead; 485 }; 486 487 struct xfrm_policy_walk { 488 struct xfrm_policy_walk_entry walk; 489 u8 type; 490 u32 seq; 491 }; 492 493 struct xfrm_policy_queue { 494 struct sk_buff_head hold_queue; 495 struct timer_list hold_timer; 496 unsigned long timeout; 497 }; 498 499 struct xfrm_policy { 500 possible_net_t xp_net; 501 struct hlist_node bydst; 502 struct hlist_node byidx; 503 504 /* This lock only affects elements except for entry. */ 505 rwlock_t lock; 506 refcount_t refcnt; 507 u32 pos; 508 struct timer_list timer; 509 510 atomic_t genid; 511 u32 priority; 512 u32 index; 513 u32 if_id; 514 struct xfrm_mark mark; 515 struct xfrm_selector selector; 516 struct xfrm_lifetime_cfg lft; 517 struct xfrm_lifetime_cur curlft; 518 struct xfrm_policy_walk_entry walk; 519 struct xfrm_policy_queue polq; 520 bool bydst_reinsert; 521 u8 type; 522 u8 action; 523 u8 flags; 524 u8 xfrm_nr; 525 u16 family; 526 struct xfrm_sec_ctx *security; 527 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 528 struct hlist_node bydst_inexact_list; 529 struct rcu_head rcu; 530 }; 531 532 static inline struct net *xp_net(const struct xfrm_policy *xp) 533 { 534 return read_pnet(&xp->xp_net); 535 } 536 537 struct xfrm_kmaddress { 538 xfrm_address_t local; 539 xfrm_address_t remote; 540 u32 reserved; 541 u16 family; 542 }; 543 544 struct xfrm_migrate { 545 xfrm_address_t old_daddr; 546 xfrm_address_t old_saddr; 547 xfrm_address_t new_daddr; 548 xfrm_address_t new_saddr; 549 u8 proto; 550 u8 mode; 551 u16 reserved; 552 u32 reqid; 553 u16 old_family; 554 u16 new_family; 555 }; 556 557 #define XFRM_KM_TIMEOUT 30 558 /* what happened */ 559 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 560 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 561 562 /* default aevent timeout in units of 100ms */ 563 #define XFRM_AE_ETIME 10 564 /* Async Event timer multiplier */ 565 #define XFRM_AE_ETH_M 10 566 /* default seq threshold size */ 567 #define XFRM_AE_SEQT_SIZE 2 568 569 struct xfrm_mgr { 570 struct list_head list; 571 int (*notify)(struct xfrm_state *x, const struct km_event *c); 572 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp); 573 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 574 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 575 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c); 576 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 577 int (*migrate)(const struct xfrm_selector *sel, 578 u8 dir, u8 type, 579 const struct xfrm_migrate *m, 580 int num_bundles, 581 const struct xfrm_kmaddress *k, 582 const struct xfrm_encap_tmpl *encap); 583 bool (*is_alive)(const struct km_event *c); 584 }; 585 586 int xfrm_register_km(struct xfrm_mgr *km); 587 int xfrm_unregister_km(struct xfrm_mgr *km); 588 589 struct xfrm_tunnel_skb_cb { 590 union { 591 struct inet_skb_parm h4; 592 struct inet6_skb_parm h6; 593 } header; 594 595 union { 596 struct ip_tunnel *ip4; 597 struct ip6_tnl *ip6; 598 } tunnel; 599 }; 600 601 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0])) 602 603 /* 604 * This structure is used for the duration where packets are being 605 * transformed by IPsec. As soon as the packet leaves IPsec the 606 * area beyond the generic IP part may be overwritten. 607 */ 608 struct xfrm_skb_cb { 609 struct xfrm_tunnel_skb_cb header; 610 611 /* Sequence number for replay protection. */ 612 union { 613 struct { 614 __u32 low; 615 __u32 hi; 616 } output; 617 struct { 618 __be32 low; 619 __be32 hi; 620 } input; 621 } seq; 622 }; 623 624 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) 625 626 /* 627 * This structure is used by the afinfo prepare_input/prepare_output functions 628 * to transmit header information to the mode input/output functions. 629 */ 630 struct xfrm_mode_skb_cb { 631 struct xfrm_tunnel_skb_cb header; 632 633 /* Copied from header for IPv4, always set to zero and DF for IPv6. */ 634 __be16 id; 635 __be16 frag_off; 636 637 /* IP header length (excluding options or extension headers). */ 638 u8 ihl; 639 640 /* TOS for IPv4, class for IPv6. */ 641 u8 tos; 642 643 /* TTL for IPv4, hop limitfor IPv6. */ 644 u8 ttl; 645 646 /* Protocol for IPv4, NH for IPv6. */ 647 u8 protocol; 648 649 /* Option length for IPv4, zero for IPv6. */ 650 u8 optlen; 651 652 /* Used by IPv6 only, zero for IPv4. */ 653 u8 flow_lbl[3]; 654 }; 655 656 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0])) 657 658 /* 659 * This structure is used by the input processing to locate the SPI and 660 * related information. 661 */ 662 struct xfrm_spi_skb_cb { 663 struct xfrm_tunnel_skb_cb header; 664 665 unsigned int daddroff; 666 unsigned int family; 667 __be32 seq; 668 }; 669 670 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0])) 671 672 #ifdef CONFIG_AUDITSYSCALL 673 static inline struct audit_buffer *xfrm_audit_start(const char *op) 674 { 675 struct audit_buffer *audit_buf = NULL; 676 677 if (audit_enabled == AUDIT_OFF) 678 return NULL; 679 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC, 680 AUDIT_MAC_IPSEC_EVENT); 681 if (audit_buf == NULL) 682 return NULL; 683 audit_log_format(audit_buf, "op=%s", op); 684 return audit_buf; 685 } 686 687 static inline void xfrm_audit_helper_usrinfo(bool task_valid, 688 struct audit_buffer *audit_buf) 689 { 690 const unsigned int auid = from_kuid(&init_user_ns, task_valid ? 691 audit_get_loginuid(current) : 692 INVALID_UID); 693 const unsigned int ses = task_valid ? audit_get_sessionid(current) : 694 AUDIT_SID_UNSET; 695 696 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses); 697 audit_log_task_context(audit_buf); 698 } 699 700 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid); 701 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 702 bool task_valid); 703 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid); 704 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid); 705 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 706 struct sk_buff *skb); 707 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb, 708 __be32 net_seq); 709 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family); 710 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi, 711 __be32 net_seq); 712 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb, 713 u8 proto); 714 #else 715 716 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 717 bool task_valid) 718 { 719 } 720 721 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 722 bool task_valid) 723 { 724 } 725 726 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result, 727 bool task_valid) 728 { 729 } 730 731 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result, 732 bool task_valid) 733 { 734 } 735 736 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 737 struct sk_buff *skb) 738 { 739 } 740 741 static inline void xfrm_audit_state_replay(struct xfrm_state *x, 742 struct sk_buff *skb, __be32 net_seq) 743 { 744 } 745 746 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb, 747 u16 family) 748 { 749 } 750 751 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 752 __be32 net_spi, __be32 net_seq) 753 { 754 } 755 756 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x, 757 struct sk_buff *skb, u8 proto) 758 { 759 } 760 #endif /* CONFIG_AUDITSYSCALL */ 761 762 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 763 { 764 if (likely(policy != NULL)) 765 refcount_inc(&policy->refcnt); 766 } 767 768 void xfrm_policy_destroy(struct xfrm_policy *policy); 769 770 static inline void xfrm_pol_put(struct xfrm_policy *policy) 771 { 772 if (refcount_dec_and_test(&policy->refcnt)) 773 xfrm_policy_destroy(policy); 774 } 775 776 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 777 { 778 int i; 779 for (i = npols - 1; i >= 0; --i) 780 xfrm_pol_put(pols[i]); 781 } 782 783 void __xfrm_state_destroy(struct xfrm_state *, bool); 784 785 static inline void __xfrm_state_put(struct xfrm_state *x) 786 { 787 refcount_dec(&x->refcnt); 788 } 789 790 static inline void xfrm_state_put(struct xfrm_state *x) 791 { 792 if (refcount_dec_and_test(&x->refcnt)) 793 __xfrm_state_destroy(x, false); 794 } 795 796 static inline void xfrm_state_put_sync(struct xfrm_state *x) 797 { 798 if (refcount_dec_and_test(&x->refcnt)) 799 __xfrm_state_destroy(x, true); 800 } 801 802 static inline void xfrm_state_hold(struct xfrm_state *x) 803 { 804 refcount_inc(&x->refcnt); 805 } 806 807 static inline bool addr_match(const void *token1, const void *token2, 808 unsigned int prefixlen) 809 { 810 const __be32 *a1 = token1; 811 const __be32 *a2 = token2; 812 unsigned int pdw; 813 unsigned int pbi; 814 815 pdw = prefixlen >> 5; /* num of whole u32 in prefix */ 816 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 817 818 if (pdw) 819 if (memcmp(a1, a2, pdw << 2)) 820 return false; 821 822 if (pbi) { 823 __be32 mask; 824 825 mask = htonl((0xffffffff) << (32 - pbi)); 826 827 if ((a1[pdw] ^ a2[pdw]) & mask) 828 return false; 829 } 830 831 return true; 832 } 833 834 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen) 835 { 836 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */ 837 if (sizeof(long) == 4 && prefixlen == 0) 838 return true; 839 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen))); 840 } 841 842 static __inline__ 843 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli) 844 { 845 __be16 port; 846 switch(fl->flowi_proto) { 847 case IPPROTO_TCP: 848 case IPPROTO_UDP: 849 case IPPROTO_UDPLITE: 850 case IPPROTO_SCTP: 851 port = uli->ports.sport; 852 break; 853 case IPPROTO_ICMP: 854 case IPPROTO_ICMPV6: 855 port = htons(uli->icmpt.type); 856 break; 857 case IPPROTO_MH: 858 port = htons(uli->mht.type); 859 break; 860 case IPPROTO_GRE: 861 port = htons(ntohl(uli->gre_key) >> 16); 862 break; 863 default: 864 port = 0; /*XXX*/ 865 } 866 return port; 867 } 868 869 static __inline__ 870 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli) 871 { 872 __be16 port; 873 switch(fl->flowi_proto) { 874 case IPPROTO_TCP: 875 case IPPROTO_UDP: 876 case IPPROTO_UDPLITE: 877 case IPPROTO_SCTP: 878 port = uli->ports.dport; 879 break; 880 case IPPROTO_ICMP: 881 case IPPROTO_ICMPV6: 882 port = htons(uli->icmpt.code); 883 break; 884 case IPPROTO_GRE: 885 port = htons(ntohl(uli->gre_key) & 0xffff); 886 break; 887 default: 888 port = 0; /*XXX*/ 889 } 890 return port; 891 } 892 893 bool xfrm_selector_match(const struct xfrm_selector *sel, 894 const struct flowi *fl, unsigned short family); 895 896 #ifdef CONFIG_SECURITY_NETWORK_XFRM 897 /* If neither has a context --> match 898 * Otherwise, both must have a context and the sids, doi, alg must match 899 */ 900 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 901 { 902 return ((!s1 && !s2) || 903 (s1 && s2 && 904 (s1->ctx_sid == s2->ctx_sid) && 905 (s1->ctx_doi == s2->ctx_doi) && 906 (s1->ctx_alg == s2->ctx_alg))); 907 } 908 #else 909 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 910 { 911 return true; 912 } 913 #endif 914 915 /* A struct encoding bundle of transformations to apply to some set of flow. 916 * 917 * xdst->child points to the next element of bundle. 918 * dst->xfrm points to an instanse of transformer. 919 * 920 * Due to unfortunate limitations of current routing cache, which we 921 * have no time to fix, it mirrors struct rtable and bound to the same 922 * routing key, including saddr,daddr. However, we can have many of 923 * bundles differing by session id. All the bundles grow from a parent 924 * policy rule. 925 */ 926 struct xfrm_dst { 927 union { 928 struct dst_entry dst; 929 struct rtable rt; 930 struct rt6_info rt6; 931 } u; 932 struct dst_entry *route; 933 struct dst_entry *child; 934 struct dst_entry *path; 935 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; 936 int num_pols, num_xfrms; 937 u32 xfrm_genid; 938 u32 policy_genid; 939 u32 route_mtu_cached; 940 u32 child_mtu_cached; 941 u32 route_cookie; 942 u32 path_cookie; 943 }; 944 945 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst) 946 { 947 #ifdef CONFIG_XFRM 948 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) { 949 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst; 950 951 return xdst->path; 952 } 953 #endif 954 return (struct dst_entry *) dst; 955 } 956 957 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst) 958 { 959 #ifdef CONFIG_XFRM 960 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) { 961 struct xfrm_dst *xdst = (struct xfrm_dst *) dst; 962 return xdst->child; 963 } 964 #endif 965 return NULL; 966 } 967 968 #ifdef CONFIG_XFRM 969 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child) 970 { 971 xdst->child = child; 972 } 973 974 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 975 { 976 xfrm_pols_put(xdst->pols, xdst->num_pols); 977 dst_release(xdst->route); 978 if (likely(xdst->u.dst.xfrm)) 979 xfrm_state_put(xdst->u.dst.xfrm); 980 } 981 #endif 982 983 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 984 985 struct xfrm_if_parms { 986 int link; /* ifindex of underlying L2 interface */ 987 u32 if_id; /* interface identifyer */ 988 }; 989 990 struct xfrm_if { 991 struct xfrm_if __rcu *next; /* next interface in list */ 992 struct net_device *dev; /* virtual device associated with interface */ 993 struct net *net; /* netns for packet i/o */ 994 struct xfrm_if_parms p; /* interface parms */ 995 996 struct gro_cells gro_cells; 997 }; 998 999 struct xfrm_offload { 1000 /* Output sequence number for replay protection on offloading. */ 1001 struct { 1002 __u32 low; 1003 __u32 hi; 1004 } seq; 1005 1006 __u32 flags; 1007 #define SA_DELETE_REQ 1 1008 #define CRYPTO_DONE 2 1009 #define CRYPTO_NEXT_DONE 4 1010 #define CRYPTO_FALLBACK 8 1011 #define XFRM_GSO_SEGMENT 16 1012 #define XFRM_GRO 32 1013 /* 64 is free */ 1014 #define XFRM_DEV_RESUME 128 1015 #define XFRM_XMIT 256 1016 1017 __u32 status; 1018 #define CRYPTO_SUCCESS 1 1019 #define CRYPTO_GENERIC_ERROR 2 1020 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4 1021 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8 1022 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16 1023 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32 1024 #define CRYPTO_INVALID_PACKET_SYNTAX 64 1025 #define CRYPTO_INVALID_PROTOCOL 128 1026 1027 __u8 proto; 1028 __u8 inner_ipproto; 1029 }; 1030 1031 struct sec_path { 1032 int len; 1033 int olen; 1034 1035 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 1036 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH]; 1037 }; 1038 1039 struct sec_path *secpath_set(struct sk_buff *skb); 1040 1041 static inline void 1042 secpath_reset(struct sk_buff *skb) 1043 { 1044 #ifdef CONFIG_XFRM 1045 skb_ext_del(skb, SKB_EXT_SEC_PATH); 1046 #endif 1047 } 1048 1049 static inline int 1050 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family) 1051 { 1052 switch (family) { 1053 case AF_INET: 1054 return addr->a4 == 0; 1055 case AF_INET6: 1056 return ipv6_addr_any(&addr->in6); 1057 } 1058 return 0; 1059 } 1060 1061 static inline int 1062 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1063 { 1064 return (tmpl->saddr.a4 && 1065 tmpl->saddr.a4 != x->props.saddr.a4); 1066 } 1067 1068 static inline int 1069 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1070 { 1071 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 1072 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 1073 } 1074 1075 static inline int 1076 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family) 1077 { 1078 switch (family) { 1079 case AF_INET: 1080 return __xfrm4_state_addr_cmp(tmpl, x); 1081 case AF_INET6: 1082 return __xfrm6_state_addr_cmp(tmpl, x); 1083 } 1084 return !0; 1085 } 1086 1087 #ifdef CONFIG_XFRM 1088 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, 1089 unsigned short family); 1090 1091 static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb, 1092 int dir) 1093 { 1094 if (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) 1095 return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT; 1096 1097 return false; 1098 } 1099 1100 static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb, 1101 int dir, unsigned short family) 1102 { 1103 if (dir != XFRM_POLICY_OUT && family == AF_INET) { 1104 /* same dst may be used for traffic originating from 1105 * devices with different policy settings. 1106 */ 1107 return IPCB(skb)->flags & IPSKB_NOPOLICY; 1108 } 1109 return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY); 1110 } 1111 1112 static inline int __xfrm_policy_check2(struct sock *sk, int dir, 1113 struct sk_buff *skb, 1114 unsigned int family, int reverse) 1115 { 1116 struct net *net = dev_net(skb->dev); 1117 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); 1118 1119 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 1120 return __xfrm_policy_check(sk, ndir, skb, family); 1121 1122 return __xfrm_check_nopolicy(net, skb, dir) || 1123 __xfrm_check_dev_nopolicy(skb, dir, family) || 1124 __xfrm_policy_check(sk, ndir, skb, family); 1125 } 1126 1127 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1128 { 1129 return __xfrm_policy_check2(sk, dir, skb, family, 0); 1130 } 1131 1132 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1133 { 1134 return xfrm_policy_check(sk, dir, skb, AF_INET); 1135 } 1136 1137 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1138 { 1139 return xfrm_policy_check(sk, dir, skb, AF_INET6); 1140 } 1141 1142 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1143 struct sk_buff *skb) 1144 { 1145 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); 1146 } 1147 1148 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1149 struct sk_buff *skb) 1150 { 1151 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); 1152 } 1153 1154 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1155 unsigned int family, int reverse); 1156 1157 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1158 unsigned int family) 1159 { 1160 return __xfrm_decode_session(skb, fl, family, 0); 1161 } 1162 1163 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1164 struct flowi *fl, 1165 unsigned int family) 1166 { 1167 return __xfrm_decode_session(skb, fl, family, 1); 1168 } 1169 1170 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 1171 1172 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 1173 { 1174 struct net *net = dev_net(skb->dev); 1175 1176 if (!net->xfrm.policy_count[XFRM_POLICY_OUT] && 1177 net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT) 1178 return true; 1179 1180 return (skb_dst(skb)->flags & DST_NOXFRM) || 1181 __xfrm_route_forward(skb, family); 1182 } 1183 1184 static inline int xfrm4_route_forward(struct sk_buff *skb) 1185 { 1186 return xfrm_route_forward(skb, AF_INET); 1187 } 1188 1189 static inline int xfrm6_route_forward(struct sk_buff *skb) 1190 { 1191 return xfrm_route_forward(skb, AF_INET6); 1192 } 1193 1194 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk); 1195 1196 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) 1197 { 1198 sk->sk_policy[0] = NULL; 1199 sk->sk_policy[1] = NULL; 1200 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1])) 1201 return __xfrm_sk_clone_policy(sk, osk); 1202 return 0; 1203 } 1204 1205 int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 1206 1207 static inline void xfrm_sk_free_policy(struct sock *sk) 1208 { 1209 struct xfrm_policy *pol; 1210 1211 pol = rcu_dereference_protected(sk->sk_policy[0], 1); 1212 if (unlikely(pol != NULL)) { 1213 xfrm_policy_delete(pol, XFRM_POLICY_MAX); 1214 sk->sk_policy[0] = NULL; 1215 } 1216 pol = rcu_dereference_protected(sk->sk_policy[1], 1); 1217 if (unlikely(pol != NULL)) { 1218 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1); 1219 sk->sk_policy[1] = NULL; 1220 } 1221 } 1222 1223 #else 1224 1225 static inline void xfrm_sk_free_policy(struct sock *sk) {} 1226 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; } 1227 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 1228 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 1229 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1230 { 1231 return 1; 1232 } 1233 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1234 { 1235 return 1; 1236 } 1237 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1238 { 1239 return 1; 1240 } 1241 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1242 struct flowi *fl, 1243 unsigned int family) 1244 { 1245 return -ENOSYS; 1246 } 1247 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1248 struct sk_buff *skb) 1249 { 1250 return 1; 1251 } 1252 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1253 struct sk_buff *skb) 1254 { 1255 return 1; 1256 } 1257 #endif 1258 1259 static __inline__ 1260 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family) 1261 { 1262 switch (family){ 1263 case AF_INET: 1264 return (xfrm_address_t *)&fl->u.ip4.daddr; 1265 case AF_INET6: 1266 return (xfrm_address_t *)&fl->u.ip6.daddr; 1267 } 1268 return NULL; 1269 } 1270 1271 static __inline__ 1272 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family) 1273 { 1274 switch (family){ 1275 case AF_INET: 1276 return (xfrm_address_t *)&fl->u.ip4.saddr; 1277 case AF_INET6: 1278 return (xfrm_address_t *)&fl->u.ip6.saddr; 1279 } 1280 return NULL; 1281 } 1282 1283 static __inline__ 1284 void xfrm_flowi_addr_get(const struct flowi *fl, 1285 xfrm_address_t *saddr, xfrm_address_t *daddr, 1286 unsigned short family) 1287 { 1288 switch(family) { 1289 case AF_INET: 1290 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4)); 1291 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4)); 1292 break; 1293 case AF_INET6: 1294 saddr->in6 = fl->u.ip6.saddr; 1295 daddr->in6 = fl->u.ip6.daddr; 1296 break; 1297 } 1298 } 1299 1300 static __inline__ int 1301 __xfrm4_state_addr_check(const struct xfrm_state *x, 1302 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1303 { 1304 if (daddr->a4 == x->id.daddr.a4 && 1305 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 1306 return 1; 1307 return 0; 1308 } 1309 1310 static __inline__ int 1311 __xfrm6_state_addr_check(const struct xfrm_state *x, 1312 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1313 { 1314 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 1315 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) || 1316 ipv6_addr_any((struct in6_addr *)saddr) || 1317 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 1318 return 1; 1319 return 0; 1320 } 1321 1322 static __inline__ int 1323 xfrm_state_addr_check(const struct xfrm_state *x, 1324 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1325 unsigned short family) 1326 { 1327 switch (family) { 1328 case AF_INET: 1329 return __xfrm4_state_addr_check(x, daddr, saddr); 1330 case AF_INET6: 1331 return __xfrm6_state_addr_check(x, daddr, saddr); 1332 } 1333 return 0; 1334 } 1335 1336 static __inline__ int 1337 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl, 1338 unsigned short family) 1339 { 1340 switch (family) { 1341 case AF_INET: 1342 return __xfrm4_state_addr_check(x, 1343 (const xfrm_address_t *)&fl->u.ip4.daddr, 1344 (const xfrm_address_t *)&fl->u.ip4.saddr); 1345 case AF_INET6: 1346 return __xfrm6_state_addr_check(x, 1347 (const xfrm_address_t *)&fl->u.ip6.daddr, 1348 (const xfrm_address_t *)&fl->u.ip6.saddr); 1349 } 1350 return 0; 1351 } 1352 1353 static inline int xfrm_state_kern(const struct xfrm_state *x) 1354 { 1355 return atomic_read(&x->tunnel_users); 1356 } 1357 1358 static inline bool xfrm_id_proto_valid(u8 proto) 1359 { 1360 switch (proto) { 1361 case IPPROTO_AH: 1362 case IPPROTO_ESP: 1363 case IPPROTO_COMP: 1364 #if IS_ENABLED(CONFIG_IPV6) 1365 case IPPROTO_ROUTING: 1366 case IPPROTO_DSTOPTS: 1367 #endif 1368 return true; 1369 default: 1370 return false; 1371 } 1372 } 1373 1374 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */ 1375 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 1376 { 1377 return (!userproto || proto == userproto || 1378 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 1379 proto == IPPROTO_ESP || 1380 proto == IPPROTO_COMP))); 1381 } 1382 1383 /* 1384 * xfrm algorithm information 1385 */ 1386 struct xfrm_algo_aead_info { 1387 char *geniv; 1388 u16 icv_truncbits; 1389 }; 1390 1391 struct xfrm_algo_auth_info { 1392 u16 icv_truncbits; 1393 u16 icv_fullbits; 1394 }; 1395 1396 struct xfrm_algo_encr_info { 1397 char *geniv; 1398 u16 blockbits; 1399 u16 defkeybits; 1400 }; 1401 1402 struct xfrm_algo_comp_info { 1403 u16 threshold; 1404 }; 1405 1406 struct xfrm_algo_desc { 1407 char *name; 1408 char *compat; 1409 u8 available:1; 1410 u8 pfkey_supported:1; 1411 union { 1412 struct xfrm_algo_aead_info aead; 1413 struct xfrm_algo_auth_info auth; 1414 struct xfrm_algo_encr_info encr; 1415 struct xfrm_algo_comp_info comp; 1416 } uinfo; 1417 struct sadb_alg desc; 1418 }; 1419 1420 /* XFRM protocol handlers. */ 1421 struct xfrm4_protocol { 1422 int (*handler)(struct sk_buff *skb); 1423 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1424 int encap_type); 1425 int (*cb_handler)(struct sk_buff *skb, int err); 1426 int (*err_handler)(struct sk_buff *skb, u32 info); 1427 1428 struct xfrm4_protocol __rcu *next; 1429 int priority; 1430 }; 1431 1432 struct xfrm6_protocol { 1433 int (*handler)(struct sk_buff *skb); 1434 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1435 int encap_type); 1436 int (*cb_handler)(struct sk_buff *skb, int err); 1437 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1438 u8 type, u8 code, int offset, __be32 info); 1439 1440 struct xfrm6_protocol __rcu *next; 1441 int priority; 1442 }; 1443 1444 /* XFRM tunnel handlers. */ 1445 struct xfrm_tunnel { 1446 int (*handler)(struct sk_buff *skb); 1447 int (*cb_handler)(struct sk_buff *skb, int err); 1448 int (*err_handler)(struct sk_buff *skb, u32 info); 1449 1450 struct xfrm_tunnel __rcu *next; 1451 int priority; 1452 }; 1453 1454 struct xfrm6_tunnel { 1455 int (*handler)(struct sk_buff *skb); 1456 int (*cb_handler)(struct sk_buff *skb, int err); 1457 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1458 u8 type, u8 code, int offset, __be32 info); 1459 struct xfrm6_tunnel __rcu *next; 1460 int priority; 1461 }; 1462 1463 void xfrm_init(void); 1464 void xfrm4_init(void); 1465 int xfrm_state_init(struct net *net); 1466 void xfrm_state_fini(struct net *net); 1467 void xfrm4_state_init(void); 1468 void xfrm4_protocol_init(void); 1469 #ifdef CONFIG_XFRM 1470 int xfrm6_init(void); 1471 void xfrm6_fini(void); 1472 int xfrm6_state_init(void); 1473 void xfrm6_state_fini(void); 1474 int xfrm6_protocol_init(void); 1475 void xfrm6_protocol_fini(void); 1476 #else 1477 static inline int xfrm6_init(void) 1478 { 1479 return 0; 1480 } 1481 static inline void xfrm6_fini(void) 1482 { 1483 ; 1484 } 1485 #endif 1486 1487 #ifdef CONFIG_XFRM_STATISTICS 1488 int xfrm_proc_init(struct net *net); 1489 void xfrm_proc_fini(struct net *net); 1490 #endif 1491 1492 int xfrm_sysctl_init(struct net *net); 1493 #ifdef CONFIG_SYSCTL 1494 void xfrm_sysctl_fini(struct net *net); 1495 #else 1496 static inline void xfrm_sysctl_fini(struct net *net) 1497 { 1498 } 1499 #endif 1500 1501 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 1502 struct xfrm_address_filter *filter); 1503 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1504 int (*func)(struct xfrm_state *, int, void*), void *); 1505 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net); 1506 struct xfrm_state *xfrm_state_alloc(struct net *net); 1507 void xfrm_state_free(struct xfrm_state *x); 1508 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr, 1509 const xfrm_address_t *saddr, 1510 const struct flowi *fl, 1511 struct xfrm_tmpl *tmpl, 1512 struct xfrm_policy *pol, int *err, 1513 unsigned short family, u32 if_id); 1514 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id, 1515 xfrm_address_t *daddr, 1516 xfrm_address_t *saddr, 1517 unsigned short family, 1518 u8 mode, u8 proto, u32 reqid); 1519 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1520 unsigned short family); 1521 int xfrm_state_check_expire(struct xfrm_state *x); 1522 void xfrm_state_insert(struct xfrm_state *x); 1523 int xfrm_state_add(struct xfrm_state *x); 1524 int xfrm_state_update(struct xfrm_state *x); 1525 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark, 1526 const xfrm_address_t *daddr, __be32 spi, 1527 u8 proto, unsigned short family); 1528 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1529 const xfrm_address_t *daddr, 1530 const xfrm_address_t *saddr, 1531 u8 proto, 1532 unsigned short family); 1533 #ifdef CONFIG_XFRM_SUB_POLICY 1534 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1535 unsigned short family); 1536 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1537 unsigned short family); 1538 #else 1539 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s, 1540 int n, unsigned short family) 1541 { 1542 } 1543 1544 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s, 1545 int n, unsigned short family) 1546 { 1547 } 1548 #endif 1549 1550 struct xfrmk_sadinfo { 1551 u32 sadhcnt; /* current hash bkts */ 1552 u32 sadhmcnt; /* max allowed hash bkts */ 1553 u32 sadcnt; /* current running count */ 1554 }; 1555 1556 struct xfrmk_spdinfo { 1557 u32 incnt; 1558 u32 outcnt; 1559 u32 fwdcnt; 1560 u32 inscnt; 1561 u32 outscnt; 1562 u32 fwdscnt; 1563 u32 spdhcnt; 1564 u32 spdhmcnt; 1565 }; 1566 1567 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1568 int xfrm_state_delete(struct xfrm_state *x); 1569 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync); 1570 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid); 1571 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); 1572 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); 1573 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq); 1574 int xfrm_init_replay(struct xfrm_state *x); 1575 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu); 1576 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload); 1577 int xfrm_init_state(struct xfrm_state *x); 1578 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type); 1579 int xfrm_input_resume(struct sk_buff *skb, int nexthdr); 1580 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb, 1581 int (*finish)(struct net *, struct sock *, 1582 struct sk_buff *)); 1583 int xfrm_trans_queue(struct sk_buff *skb, 1584 int (*finish)(struct net *, struct sock *, 1585 struct sk_buff *)); 1586 int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err); 1587 int xfrm_output(struct sock *sk, struct sk_buff *skb); 1588 1589 #if IS_ENABLED(CONFIG_NET_PKTGEN) 1590 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb); 1591 #endif 1592 1593 void xfrm_local_error(struct sk_buff *skb, int mtu); 1594 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1595 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1596 int encap_type); 1597 int xfrm4_transport_finish(struct sk_buff *skb, int async); 1598 int xfrm4_rcv(struct sk_buff *skb); 1599 1600 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1601 { 1602 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL; 1603 XFRM_SPI_SKB_CB(skb)->family = AF_INET; 1604 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); 1605 return xfrm_input(skb, nexthdr, spi, 0); 1606 } 1607 1608 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1609 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol); 1610 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol); 1611 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1612 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1613 void xfrm4_local_error(struct sk_buff *skb, u32 mtu); 1614 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1615 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi, 1616 struct ip6_tnl *t); 1617 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1618 int encap_type); 1619 int xfrm6_transport_finish(struct sk_buff *skb, int async); 1620 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t); 1621 int xfrm6_rcv(struct sk_buff *skb); 1622 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1623 xfrm_address_t *saddr, u8 proto); 1624 void xfrm6_local_error(struct sk_buff *skb, u32 mtu); 1625 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol); 1626 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol); 1627 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1628 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1629 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr); 1630 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr); 1631 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1632 1633 #ifdef CONFIG_XFRM 1634 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu); 1635 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1636 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1637 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, 1638 int optlen); 1639 #else 1640 static inline int xfrm_user_policy(struct sock *sk, int optname, 1641 sockptr_t optval, int optlen) 1642 { 1643 return -ENOPROTOOPT; 1644 } 1645 #endif 1646 1647 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif, 1648 const xfrm_address_t *saddr, 1649 const xfrm_address_t *daddr, 1650 int family, u32 mark); 1651 1652 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); 1653 1654 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); 1655 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, 1656 int (*func)(struct xfrm_policy *, int, int, void*), 1657 void *); 1658 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net); 1659 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1660 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, 1661 const struct xfrm_mark *mark, 1662 u32 if_id, u8 type, int dir, 1663 struct xfrm_selector *sel, 1664 struct xfrm_sec_ctx *ctx, int delete, 1665 int *err); 1666 struct xfrm_policy *xfrm_policy_byid(struct net *net, 1667 const struct xfrm_mark *mark, u32 if_id, 1668 u8 type, int dir, u32 id, int delete, 1669 int *err); 1670 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid); 1671 void xfrm_policy_hash_rebuild(struct net *net); 1672 u32 xfrm_get_acqseq(void); 1673 int verify_spi_info(u8 proto, u32 min, u32 max); 1674 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 1675 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, 1676 u8 mode, u32 reqid, u32 if_id, u8 proto, 1677 const xfrm_address_t *daddr, 1678 const xfrm_address_t *saddr, int create, 1679 unsigned short family); 1680 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1681 1682 #ifdef CONFIG_XFRM_MIGRATE 1683 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1684 const struct xfrm_migrate *m, int num_bundles, 1685 const struct xfrm_kmaddress *k, 1686 const struct xfrm_encap_tmpl *encap); 1687 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net, 1688 u32 if_id); 1689 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 1690 struct xfrm_migrate *m, 1691 struct xfrm_encap_tmpl *encap); 1692 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1693 struct xfrm_migrate *m, int num_bundles, 1694 struct xfrm_kmaddress *k, struct net *net, 1695 struct xfrm_encap_tmpl *encap, u32 if_id); 1696 #endif 1697 1698 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1699 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid); 1700 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, 1701 xfrm_address_t *addr); 1702 1703 void xfrm_input_init(void); 1704 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1705 1706 void xfrm_probe_algs(void); 1707 int xfrm_count_pfkey_auth_supported(void); 1708 int xfrm_count_pfkey_enc_supported(void); 1709 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1710 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1711 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1712 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1713 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1714 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe); 1715 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe); 1716 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe); 1717 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, 1718 int probe); 1719 1720 static inline bool xfrm6_addr_equal(const xfrm_address_t *a, 1721 const xfrm_address_t *b) 1722 { 1723 return ipv6_addr_equal((const struct in6_addr *)a, 1724 (const struct in6_addr *)b); 1725 } 1726 1727 static inline bool xfrm_addr_equal(const xfrm_address_t *a, 1728 const xfrm_address_t *b, 1729 sa_family_t family) 1730 { 1731 switch (family) { 1732 default: 1733 case AF_INET: 1734 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0; 1735 case AF_INET6: 1736 return xfrm6_addr_equal(a, b); 1737 } 1738 } 1739 1740 static inline int xfrm_policy_id2dir(u32 index) 1741 { 1742 return index & 7; 1743 } 1744 1745 #ifdef CONFIG_XFRM 1746 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq); 1747 int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq); 1748 void xfrm_replay_notify(struct xfrm_state *x, int event); 1749 int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb); 1750 int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq); 1751 1752 static inline int xfrm_aevent_is_on(struct net *net) 1753 { 1754 struct sock *nlsk; 1755 int ret = 0; 1756 1757 rcu_read_lock(); 1758 nlsk = rcu_dereference(net->xfrm.nlsk); 1759 if (nlsk) 1760 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1761 rcu_read_unlock(); 1762 return ret; 1763 } 1764 1765 static inline int xfrm_acquire_is_on(struct net *net) 1766 { 1767 struct sock *nlsk; 1768 int ret = 0; 1769 1770 rcu_read_lock(); 1771 nlsk = rcu_dereference(net->xfrm.nlsk); 1772 if (nlsk) 1773 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE); 1774 rcu_read_unlock(); 1775 1776 return ret; 1777 } 1778 #endif 1779 1780 static inline unsigned int aead_len(struct xfrm_algo_aead *alg) 1781 { 1782 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1783 } 1784 1785 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg) 1786 { 1787 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1788 } 1789 1790 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg) 1791 { 1792 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1793 } 1794 1795 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn) 1796 { 1797 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32); 1798 } 1799 1800 #ifdef CONFIG_XFRM_MIGRATE 1801 static inline int xfrm_replay_clone(struct xfrm_state *x, 1802 struct xfrm_state *orig) 1803 { 1804 1805 x->replay_esn = kmemdup(orig->replay_esn, 1806 xfrm_replay_state_esn_len(orig->replay_esn), 1807 GFP_KERNEL); 1808 if (!x->replay_esn) 1809 return -ENOMEM; 1810 x->preplay_esn = kmemdup(orig->preplay_esn, 1811 xfrm_replay_state_esn_len(orig->preplay_esn), 1812 GFP_KERNEL); 1813 if (!x->preplay_esn) 1814 return -ENOMEM; 1815 1816 return 0; 1817 } 1818 1819 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig) 1820 { 1821 return kmemdup(orig, aead_len(orig), GFP_KERNEL); 1822 } 1823 1824 1825 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1826 { 1827 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); 1828 } 1829 1830 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig) 1831 { 1832 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL); 1833 } 1834 1835 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1836 { 1837 int i; 1838 for (i = 0; i < n; i++) 1839 xfrm_state_put(*(states + i)); 1840 } 1841 1842 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1843 { 1844 int i; 1845 for (i = 0; i < n; i++) 1846 xfrm_state_delete(*(states + i)); 1847 } 1848 #endif 1849 1850 #ifdef CONFIG_XFRM 1851 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) 1852 { 1853 struct sec_path *sp = skb_sec_path(skb); 1854 1855 return sp->xvec[sp->len - 1]; 1856 } 1857 #endif 1858 1859 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb) 1860 { 1861 #ifdef CONFIG_XFRM 1862 struct sec_path *sp = skb_sec_path(skb); 1863 1864 if (!sp || !sp->olen || sp->len != sp->olen) 1865 return NULL; 1866 1867 return &sp->ovec[sp->olen - 1]; 1868 #else 1869 return NULL; 1870 #endif 1871 } 1872 1873 void __init xfrm_dev_init(void); 1874 1875 #ifdef CONFIG_XFRM_OFFLOAD 1876 void xfrm_dev_resume(struct sk_buff *skb); 1877 void xfrm_dev_backlog(struct softnet_data *sd); 1878 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again); 1879 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, 1880 struct xfrm_user_offload *xuo); 1881 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x); 1882 1883 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 1884 { 1885 struct xfrm_dev_offload *xso = &x->xso; 1886 1887 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn) 1888 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x); 1889 } 1890 1891 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 1892 { 1893 struct xfrm_state *x = dst->xfrm; 1894 struct xfrm_dst *xdst; 1895 1896 if (!x || !x->type_offload) 1897 return false; 1898 1899 xdst = (struct xfrm_dst *) dst; 1900 if (!x->xso.offload_handle && !xdst->child->xfrm) 1901 return true; 1902 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) && 1903 !xdst->child->xfrm) 1904 return true; 1905 1906 return false; 1907 } 1908 1909 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 1910 { 1911 struct xfrm_dev_offload *xso = &x->xso; 1912 1913 if (xso->dev) 1914 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x); 1915 } 1916 1917 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1918 { 1919 struct xfrm_dev_offload *xso = &x->xso; 1920 struct net_device *dev = xso->dev; 1921 1922 if (dev && dev->xfrmdev_ops) { 1923 if (dev->xfrmdev_ops->xdo_dev_state_free) 1924 dev->xfrmdev_ops->xdo_dev_state_free(x); 1925 xso->dev = NULL; 1926 dev_put_track(dev, &xso->dev_tracker); 1927 } 1928 } 1929 #else 1930 static inline void xfrm_dev_resume(struct sk_buff *skb) 1931 { 1932 } 1933 1934 static inline void xfrm_dev_backlog(struct softnet_data *sd) 1935 { 1936 } 1937 1938 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again) 1939 { 1940 return skb; 1941 } 1942 1943 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo) 1944 { 1945 return 0; 1946 } 1947 1948 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 1949 { 1950 } 1951 1952 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1953 { 1954 } 1955 1956 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) 1957 { 1958 return false; 1959 } 1960 1961 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 1962 { 1963 } 1964 1965 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 1966 { 1967 return false; 1968 } 1969 #endif 1970 1971 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) 1972 { 1973 if (attrs[XFRMA_MARK]) 1974 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark)); 1975 else 1976 m->v = m->m = 0; 1977 1978 return m->v & m->m; 1979 } 1980 1981 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m) 1982 { 1983 int ret = 0; 1984 1985 if (m->m | m->v) 1986 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); 1987 return ret; 1988 } 1989 1990 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x) 1991 { 1992 struct xfrm_mark *m = &x->props.smark; 1993 1994 return (m->v & m->m) | (mark & ~m->m); 1995 } 1996 1997 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id) 1998 { 1999 int ret = 0; 2000 2001 if (if_id) 2002 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id); 2003 return ret; 2004 } 2005 2006 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x, 2007 unsigned int family) 2008 { 2009 bool tunnel = false; 2010 2011 switch(family) { 2012 case AF_INET: 2013 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) 2014 tunnel = true; 2015 break; 2016 case AF_INET6: 2017 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) 2018 tunnel = true; 2019 break; 2020 } 2021 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL)) 2022 return -EINVAL; 2023 2024 return 0; 2025 } 2026 2027 extern const int xfrm_msg_min[XFRM_NR_MSGTYPES]; 2028 extern const struct nla_policy xfrma_policy[XFRMA_MAX+1]; 2029 2030 struct xfrm_translator { 2031 /* Allocate frag_list and put compat translation there */ 2032 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src); 2033 2034 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */ 2035 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh, 2036 int maxtype, const struct nla_policy *policy, 2037 struct netlink_ext_ack *extack); 2038 2039 /* Translate 32-bit user_policy from sockptr */ 2040 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen); 2041 2042 struct module *owner; 2043 }; 2044 2045 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT) 2046 extern int xfrm_register_translator(struct xfrm_translator *xtr); 2047 extern int xfrm_unregister_translator(struct xfrm_translator *xtr); 2048 extern struct xfrm_translator *xfrm_get_translator(void); 2049 extern void xfrm_put_translator(struct xfrm_translator *xtr); 2050 #else 2051 static inline struct xfrm_translator *xfrm_get_translator(void) 2052 { 2053 return NULL; 2054 } 2055 static inline void xfrm_put_translator(struct xfrm_translator *xtr) 2056 { 2057 } 2058 #endif 2059 2060 #if IS_ENABLED(CONFIG_IPV6) 2061 static inline bool xfrm6_local_dontfrag(const struct sock *sk) 2062 { 2063 int proto; 2064 2065 if (!sk || sk->sk_family != AF_INET6) 2066 return false; 2067 2068 proto = sk->sk_protocol; 2069 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW) 2070 return inet6_sk(sk)->dontfrag; 2071 2072 return false; 2073 } 2074 #endif 2075 #endif /* _NET_XFRM_H */ 2076