1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _NET_XFRM_H 3 #define _NET_XFRM_H 4 5 #include <linux/compiler.h> 6 #include <linux/xfrm.h> 7 #include <linux/spinlock.h> 8 #include <linux/list.h> 9 #include <linux/skbuff.h> 10 #include <linux/socket.h> 11 #include <linux/pfkeyv2.h> 12 #include <linux/ipsec.h> 13 #include <linux/in6.h> 14 #include <linux/mutex.h> 15 #include <linux/audit.h> 16 #include <linux/slab.h> 17 #include <linux/refcount.h> 18 #include <linux/sockptr.h> 19 20 #include <net/sock.h> 21 #include <net/dst.h> 22 #include <net/ip.h> 23 #include <net/route.h> 24 #include <net/ipv6.h> 25 #include <net/ip6_fib.h> 26 #include <net/flow.h> 27 #include <net/gro_cells.h> 28 29 #include <linux/interrupt.h> 30 31 #ifdef CONFIG_XFRM_STATISTICS 32 #include <net/snmp.h> 33 #endif 34 35 #define XFRM_PROTO_ESP 50 36 #define XFRM_PROTO_AH 51 37 #define XFRM_PROTO_COMP 108 38 #define XFRM_PROTO_IPIP 4 39 #define XFRM_PROTO_IPV6 41 40 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING 41 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS 42 43 #define XFRM_ALIGN4(len) (((len) + 3) & ~3) 44 #define XFRM_ALIGN8(len) (((len) + 7) & ~7) 45 #define MODULE_ALIAS_XFRM_MODE(family, encap) \ 46 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap)) 47 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \ 48 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto)) 49 #define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \ 50 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto)) 51 52 #ifdef CONFIG_XFRM_STATISTICS 53 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field) 54 #else 55 #define XFRM_INC_STATS(net, field) ((void)(net)) 56 #endif 57 58 59 /* Organization of SPD aka "XFRM rules" 60 ------------------------------------ 61 62 Basic objects: 63 - policy rule, struct xfrm_policy (=SPD entry) 64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) 65 - instance of a transformer, struct xfrm_state (=SA) 66 - template to clone xfrm_state, struct xfrm_tmpl 67 68 SPD is plain linear list of xfrm_policy rules, ordered by priority. 69 (To be compatible with existing pfkeyv2 implementations, 70 many rules with priority of 0x7fffffff are allowed to exist and 71 such rules are ordered in an unpredictable way, thanks to bsd folks.) 72 73 Lookup is plain linear search until the first match with selector. 74 75 If "action" is "block", then we prohibit the flow, otherwise: 76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, 77 policy entry has list of up to XFRM_MAX_DEPTH transformations, 78 described by templates xfrm_tmpl. Each template is resolved 79 to a complete xfrm_state (see below) and we pack bundle of transformations 80 to a dst_entry returned to requestor. 81 82 dst -. xfrm .-> xfrm_state #1 83 |---. child .-> dst -. xfrm .-> xfrm_state #2 84 |---. child .-> dst -. xfrm .-> xfrm_state #3 85 |---. child .-> NULL 86 87 Bundles are cached at xrfm_policy struct (field ->bundles). 88 89 90 Resolution of xrfm_tmpl 91 ----------------------- 92 Template contains: 93 1. ->mode Mode: transport or tunnel 94 2. ->id.proto Protocol: AH/ESP/IPCOMP 95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. 96 Q: allow to resolve security gateway? 97 4. ->id.spi If not zero, static SPI. 98 5. ->saddr Local tunnel endpoint, ignored for transport mode. 99 6. ->algos List of allowed algos. Plain bitmask now. 100 Q: ealgos, aalgos, calgos. What a mess... 101 7. ->share Sharing mode. 102 Q: how to implement private sharing mode? To add struct sock* to 103 flow id? 104 105 Having this template we search through SAD searching for entries 106 with appropriate mode/proto/algo, permitted by selector. 107 If no appropriate entry found, it is requested from key manager. 108 109 PROBLEMS: 110 Q: How to find all the bundles referring to a physical path for 111 PMTU discovery? Seems, dst should contain list of all parents... 112 and enter to infinite locking hierarchy disaster. 113 No! It is easier, we will not search for them, let them find us. 114 We add genid to each dst plus pointer to genid of raw IP route, 115 pmtu disc will update pmtu on raw IP route and increase its genid. 116 dst_check() will see this for top level and trigger resyncing 117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved. 118 */ 119 120 struct xfrm_state_walk { 121 struct list_head all; 122 u8 state; 123 u8 dying; 124 u8 proto; 125 u32 seq; 126 struct xfrm_address_filter *filter; 127 }; 128 129 enum { 130 XFRM_DEV_OFFLOAD_IN = 1, 131 XFRM_DEV_OFFLOAD_OUT, 132 XFRM_DEV_OFFLOAD_FWD, 133 }; 134 135 enum { 136 XFRM_DEV_OFFLOAD_UNSPECIFIED, 137 XFRM_DEV_OFFLOAD_CRYPTO, 138 XFRM_DEV_OFFLOAD_PACKET, 139 }; 140 141 enum { 142 XFRM_DEV_OFFLOAD_FLAG_ACQ = 1, 143 }; 144 145 struct xfrm_dev_offload { 146 struct net_device *dev; 147 netdevice_tracker dev_tracker; 148 struct net_device *real_dev; 149 unsigned long offload_handle; 150 u8 dir : 2; 151 u8 type : 2; 152 u8 flags : 2; 153 }; 154 155 struct xfrm_mode { 156 u8 encap; 157 u8 family; 158 u8 flags; 159 }; 160 161 /* Flags for xfrm_mode. */ 162 enum { 163 XFRM_MODE_FLAG_TUNNEL = 1, 164 }; 165 166 enum xfrm_replay_mode { 167 XFRM_REPLAY_MODE_LEGACY, 168 XFRM_REPLAY_MODE_BMP, 169 XFRM_REPLAY_MODE_ESN, 170 }; 171 172 /* Full description of state of transformer. */ 173 struct xfrm_state { 174 possible_net_t xs_net; 175 union { 176 struct hlist_node gclist; 177 struct hlist_node bydst; 178 }; 179 union { 180 struct hlist_node dev_gclist; 181 struct hlist_node bysrc; 182 }; 183 struct hlist_node byspi; 184 struct hlist_node byseq; 185 186 refcount_t refcnt; 187 spinlock_t lock; 188 189 struct xfrm_id id; 190 struct xfrm_selector sel; 191 struct xfrm_mark mark; 192 u32 if_id; 193 u32 tfcpad; 194 195 u32 genid; 196 197 /* Key manager bits */ 198 struct xfrm_state_walk km; 199 200 /* Parameters of this state. */ 201 struct { 202 u32 reqid; 203 u8 mode; 204 u8 replay_window; 205 u8 aalgo, ealgo, calgo; 206 u8 flags; 207 u16 family; 208 xfrm_address_t saddr; 209 int header_len; 210 int trailer_len; 211 u32 extra_flags; 212 struct xfrm_mark smark; 213 } props; 214 215 struct xfrm_lifetime_cfg lft; 216 217 /* Data for transformer */ 218 struct xfrm_algo_auth *aalg; 219 struct xfrm_algo *ealg; 220 struct xfrm_algo *calg; 221 struct xfrm_algo_aead *aead; 222 const char *geniv; 223 224 /* mapping change rate limiting */ 225 __be16 new_mapping_sport; 226 u32 new_mapping; /* seconds */ 227 u32 mapping_maxage; /* seconds for input SA */ 228 229 /* Data for encapsulator */ 230 struct xfrm_encap_tmpl *encap; 231 struct sock __rcu *encap_sk; 232 233 /* Data for care-of address */ 234 xfrm_address_t *coaddr; 235 236 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 237 struct xfrm_state *tunnel; 238 239 /* If a tunnel, number of users + 1 */ 240 atomic_t tunnel_users; 241 242 /* State for replay detection */ 243 struct xfrm_replay_state replay; 244 struct xfrm_replay_state_esn *replay_esn; 245 246 /* Replay detection state at the time we sent the last notification */ 247 struct xfrm_replay_state preplay; 248 struct xfrm_replay_state_esn *preplay_esn; 249 250 /* replay detection mode */ 251 enum xfrm_replay_mode repl_mode; 252 /* internal flag that only holds state for delayed aevent at the 253 * moment 254 */ 255 u32 xflags; 256 257 /* Replay detection notification settings */ 258 u32 replay_maxage; 259 u32 replay_maxdiff; 260 261 /* Replay detection notification timer */ 262 struct timer_list rtimer; 263 264 /* Statistics */ 265 struct xfrm_stats stats; 266 267 struct xfrm_lifetime_cur curlft; 268 struct hrtimer mtimer; 269 270 struct xfrm_dev_offload xso; 271 272 /* used to fix curlft->add_time when changing date */ 273 long saved_tmo; 274 275 /* Last used time */ 276 time64_t lastused; 277 278 struct page_frag xfrag; 279 280 /* Reference to data common to all the instances of this 281 * transformer. */ 282 const struct xfrm_type *type; 283 struct xfrm_mode inner_mode; 284 struct xfrm_mode inner_mode_iaf; 285 struct xfrm_mode outer_mode; 286 287 const struct xfrm_type_offload *type_offload; 288 289 /* Security context */ 290 struct xfrm_sec_ctx *security; 291 292 /* Private data of this transformer, format is opaque, 293 * interpreted by xfrm_type methods. */ 294 void *data; 295 }; 296 297 static inline struct net *xs_net(struct xfrm_state *x) 298 { 299 return read_pnet(&x->xs_net); 300 } 301 302 /* xflags - make enum if more show up */ 303 #define XFRM_TIME_DEFER 1 304 #define XFRM_SOFT_EXPIRE 2 305 306 enum { 307 XFRM_STATE_VOID, 308 XFRM_STATE_ACQ, 309 XFRM_STATE_VALID, 310 XFRM_STATE_ERROR, 311 XFRM_STATE_EXPIRED, 312 XFRM_STATE_DEAD 313 }; 314 315 /* callback structure passed from either netlink or pfkey */ 316 struct km_event { 317 union { 318 u32 hard; 319 u32 proto; 320 u32 byid; 321 u32 aevent; 322 u32 type; 323 } data; 324 325 u32 seq; 326 u32 portid; 327 u32 event; 328 struct net *net; 329 }; 330 331 struct xfrm_if_decode_session_result { 332 struct net *net; 333 u32 if_id; 334 }; 335 336 struct xfrm_if_cb { 337 bool (*decode_session)(struct sk_buff *skb, 338 unsigned short family, 339 struct xfrm_if_decode_session_result *res); 340 }; 341 342 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb); 343 void xfrm_if_unregister_cb(void); 344 345 struct net_device; 346 struct xfrm_type; 347 struct xfrm_dst; 348 struct xfrm_policy_afinfo { 349 struct dst_ops *dst_ops; 350 struct dst_entry *(*dst_lookup)(struct net *net, 351 int tos, int oif, 352 const xfrm_address_t *saddr, 353 const xfrm_address_t *daddr, 354 u32 mark); 355 int (*get_saddr)(struct net *net, int oif, 356 xfrm_address_t *saddr, 357 xfrm_address_t *daddr, 358 u32 mark); 359 int (*fill_dst)(struct xfrm_dst *xdst, 360 struct net_device *dev, 361 const struct flowi *fl); 362 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig); 363 }; 364 365 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family); 366 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo); 367 void km_policy_notify(struct xfrm_policy *xp, int dir, 368 const struct km_event *c); 369 void km_state_notify(struct xfrm_state *x, const struct km_event *c); 370 371 struct xfrm_tmpl; 372 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, 373 struct xfrm_policy *pol); 374 void km_state_expired(struct xfrm_state *x, int hard, u32 portid); 375 int __xfrm_state_delete(struct xfrm_state *x); 376 377 struct xfrm_state_afinfo { 378 u8 family; 379 u8 proto; 380 381 const struct xfrm_type_offload *type_offload_esp; 382 383 const struct xfrm_type *type_esp; 384 const struct xfrm_type *type_ipip; 385 const struct xfrm_type *type_ipip6; 386 const struct xfrm_type *type_comp; 387 const struct xfrm_type *type_ah; 388 const struct xfrm_type *type_routing; 389 const struct xfrm_type *type_dstopts; 390 391 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb); 392 int (*transport_finish)(struct sk_buff *skb, 393 int async); 394 void (*local_error)(struct sk_buff *skb, u32 mtu); 395 }; 396 397 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 398 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 399 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); 400 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family); 401 402 struct xfrm_input_afinfo { 403 u8 family; 404 bool is_ipip; 405 int (*callback)(struct sk_buff *skb, u8 protocol, 406 int err); 407 }; 408 409 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo); 410 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo); 411 412 void xfrm_flush_gc(void); 413 void xfrm_state_delete_tunnel(struct xfrm_state *x); 414 415 struct xfrm_type { 416 struct module *owner; 417 u8 proto; 418 u8 flags; 419 #define XFRM_TYPE_NON_FRAGMENT 1 420 #define XFRM_TYPE_REPLAY_PROT 2 421 #define XFRM_TYPE_LOCAL_COADDR 4 422 #define XFRM_TYPE_REMOTE_COADDR 8 423 424 int (*init_state)(struct xfrm_state *x, 425 struct netlink_ext_ack *extack); 426 void (*destructor)(struct xfrm_state *); 427 int (*input)(struct xfrm_state *, struct sk_buff *skb); 428 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 429 int (*reject)(struct xfrm_state *, struct sk_buff *, 430 const struct flowi *); 431 }; 432 433 int xfrm_register_type(const struct xfrm_type *type, unsigned short family); 434 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); 435 436 struct xfrm_type_offload { 437 struct module *owner; 438 u8 proto; 439 void (*encap)(struct xfrm_state *, struct sk_buff *pskb); 440 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb); 441 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features); 442 }; 443 444 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family); 445 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family); 446 447 static inline int xfrm_af2proto(unsigned int family) 448 { 449 switch(family) { 450 case AF_INET: 451 return IPPROTO_IPIP; 452 case AF_INET6: 453 return IPPROTO_IPV6; 454 default: 455 return 0; 456 } 457 } 458 459 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto) 460 { 461 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) || 462 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6)) 463 return &x->inner_mode; 464 else 465 return &x->inner_mode_iaf; 466 } 467 468 struct xfrm_tmpl { 469 /* id in template is interpreted as: 470 * daddr - destination of tunnel, may be zero for transport mode. 471 * spi - zero to acquire spi. Not zero if spi is static, then 472 * daddr must be fixed too. 473 * proto - AH/ESP/IPCOMP 474 */ 475 struct xfrm_id id; 476 477 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 478 xfrm_address_t saddr; 479 480 unsigned short encap_family; 481 482 u32 reqid; 483 484 /* Mode: transport, tunnel etc. */ 485 u8 mode; 486 487 /* Sharing mode: unique, this session only, this user only etc. */ 488 u8 share; 489 490 /* May skip this transfomration if no SA is found */ 491 u8 optional; 492 493 /* Skip aalgos/ealgos/calgos checks. */ 494 u8 allalgs; 495 496 /* Bit mask of algos allowed for acquisition */ 497 u32 aalgos; 498 u32 ealgos; 499 u32 calgos; 500 }; 501 502 #define XFRM_MAX_DEPTH 6 503 #define XFRM_MAX_OFFLOAD_DEPTH 1 504 505 struct xfrm_policy_walk_entry { 506 struct list_head all; 507 u8 dead; 508 }; 509 510 struct xfrm_policy_walk { 511 struct xfrm_policy_walk_entry walk; 512 u8 type; 513 u32 seq; 514 }; 515 516 struct xfrm_policy_queue { 517 struct sk_buff_head hold_queue; 518 struct timer_list hold_timer; 519 unsigned long timeout; 520 }; 521 522 struct xfrm_policy { 523 possible_net_t xp_net; 524 struct hlist_node bydst; 525 struct hlist_node byidx; 526 527 /* This lock only affects elements except for entry. */ 528 rwlock_t lock; 529 refcount_t refcnt; 530 u32 pos; 531 struct timer_list timer; 532 533 atomic_t genid; 534 u32 priority; 535 u32 index; 536 u32 if_id; 537 struct xfrm_mark mark; 538 struct xfrm_selector selector; 539 struct xfrm_lifetime_cfg lft; 540 struct xfrm_lifetime_cur curlft; 541 struct xfrm_policy_walk_entry walk; 542 struct xfrm_policy_queue polq; 543 bool bydst_reinsert; 544 u8 type; 545 u8 action; 546 u8 flags; 547 u8 xfrm_nr; 548 u16 family; 549 struct xfrm_sec_ctx *security; 550 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 551 struct hlist_node bydst_inexact_list; 552 struct rcu_head rcu; 553 554 struct xfrm_dev_offload xdo; 555 }; 556 557 static inline struct net *xp_net(const struct xfrm_policy *xp) 558 { 559 return read_pnet(&xp->xp_net); 560 } 561 562 struct xfrm_kmaddress { 563 xfrm_address_t local; 564 xfrm_address_t remote; 565 u32 reserved; 566 u16 family; 567 }; 568 569 struct xfrm_migrate { 570 xfrm_address_t old_daddr; 571 xfrm_address_t old_saddr; 572 xfrm_address_t new_daddr; 573 xfrm_address_t new_saddr; 574 u8 proto; 575 u8 mode; 576 u16 reserved; 577 u32 reqid; 578 u16 old_family; 579 u16 new_family; 580 }; 581 582 #define XFRM_KM_TIMEOUT 30 583 /* what happened */ 584 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 585 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 586 587 /* default aevent timeout in units of 100ms */ 588 #define XFRM_AE_ETIME 10 589 /* Async Event timer multiplier */ 590 #define XFRM_AE_ETH_M 10 591 /* default seq threshold size */ 592 #define XFRM_AE_SEQT_SIZE 2 593 594 struct xfrm_mgr { 595 struct list_head list; 596 int (*notify)(struct xfrm_state *x, const struct km_event *c); 597 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp); 598 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 599 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 600 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c); 601 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 602 int (*migrate)(const struct xfrm_selector *sel, 603 u8 dir, u8 type, 604 const struct xfrm_migrate *m, 605 int num_bundles, 606 const struct xfrm_kmaddress *k, 607 const struct xfrm_encap_tmpl *encap); 608 bool (*is_alive)(const struct km_event *c); 609 }; 610 611 void xfrm_register_km(struct xfrm_mgr *km); 612 void xfrm_unregister_km(struct xfrm_mgr *km); 613 614 struct xfrm_tunnel_skb_cb { 615 union { 616 struct inet_skb_parm h4; 617 struct inet6_skb_parm h6; 618 } header; 619 620 union { 621 struct ip_tunnel *ip4; 622 struct ip6_tnl *ip6; 623 } tunnel; 624 }; 625 626 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0])) 627 628 /* 629 * This structure is used for the duration where packets are being 630 * transformed by IPsec. As soon as the packet leaves IPsec the 631 * area beyond the generic IP part may be overwritten. 632 */ 633 struct xfrm_skb_cb { 634 struct xfrm_tunnel_skb_cb header; 635 636 /* Sequence number for replay protection. */ 637 union { 638 struct { 639 __u32 low; 640 __u32 hi; 641 } output; 642 struct { 643 __be32 low; 644 __be32 hi; 645 } input; 646 } seq; 647 }; 648 649 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) 650 651 /* 652 * This structure is used by the afinfo prepare_input/prepare_output functions 653 * to transmit header information to the mode input/output functions. 654 */ 655 struct xfrm_mode_skb_cb { 656 struct xfrm_tunnel_skb_cb header; 657 658 /* Copied from header for IPv4, always set to zero and DF for IPv6. */ 659 __be16 id; 660 __be16 frag_off; 661 662 /* IP header length (excluding options or extension headers). */ 663 u8 ihl; 664 665 /* TOS for IPv4, class for IPv6. */ 666 u8 tos; 667 668 /* TTL for IPv4, hop limitfor IPv6. */ 669 u8 ttl; 670 671 /* Protocol for IPv4, NH for IPv6. */ 672 u8 protocol; 673 674 /* Option length for IPv4, zero for IPv6. */ 675 u8 optlen; 676 677 /* Used by IPv6 only, zero for IPv4. */ 678 u8 flow_lbl[3]; 679 }; 680 681 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0])) 682 683 /* 684 * This structure is used by the input processing to locate the SPI and 685 * related information. 686 */ 687 struct xfrm_spi_skb_cb { 688 struct xfrm_tunnel_skb_cb header; 689 690 unsigned int daddroff; 691 unsigned int family; 692 __be32 seq; 693 }; 694 695 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0])) 696 697 #ifdef CONFIG_AUDITSYSCALL 698 static inline struct audit_buffer *xfrm_audit_start(const char *op) 699 { 700 struct audit_buffer *audit_buf = NULL; 701 702 if (audit_enabled == AUDIT_OFF) 703 return NULL; 704 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC, 705 AUDIT_MAC_IPSEC_EVENT); 706 if (audit_buf == NULL) 707 return NULL; 708 audit_log_format(audit_buf, "op=%s", op); 709 return audit_buf; 710 } 711 712 static inline void xfrm_audit_helper_usrinfo(bool task_valid, 713 struct audit_buffer *audit_buf) 714 { 715 const unsigned int auid = from_kuid(&init_user_ns, task_valid ? 716 audit_get_loginuid(current) : 717 INVALID_UID); 718 const unsigned int ses = task_valid ? audit_get_sessionid(current) : 719 AUDIT_SID_UNSET; 720 721 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses); 722 audit_log_task_context(audit_buf); 723 } 724 725 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid); 726 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 727 bool task_valid); 728 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid); 729 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid); 730 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 731 struct sk_buff *skb); 732 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb, 733 __be32 net_seq); 734 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family); 735 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi, 736 __be32 net_seq); 737 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb, 738 u8 proto); 739 #else 740 741 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 742 bool task_valid) 743 { 744 } 745 746 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 747 bool task_valid) 748 { 749 } 750 751 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result, 752 bool task_valid) 753 { 754 } 755 756 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result, 757 bool task_valid) 758 { 759 } 760 761 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 762 struct sk_buff *skb) 763 { 764 } 765 766 static inline void xfrm_audit_state_replay(struct xfrm_state *x, 767 struct sk_buff *skb, __be32 net_seq) 768 { 769 } 770 771 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb, 772 u16 family) 773 { 774 } 775 776 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 777 __be32 net_spi, __be32 net_seq) 778 { 779 } 780 781 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x, 782 struct sk_buff *skb, u8 proto) 783 { 784 } 785 #endif /* CONFIG_AUDITSYSCALL */ 786 787 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 788 { 789 if (likely(policy != NULL)) 790 refcount_inc(&policy->refcnt); 791 } 792 793 void xfrm_policy_destroy(struct xfrm_policy *policy); 794 795 static inline void xfrm_pol_put(struct xfrm_policy *policy) 796 { 797 if (refcount_dec_and_test(&policy->refcnt)) 798 xfrm_policy_destroy(policy); 799 } 800 801 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 802 { 803 int i; 804 for (i = npols - 1; i >= 0; --i) 805 xfrm_pol_put(pols[i]); 806 } 807 808 void __xfrm_state_destroy(struct xfrm_state *, bool); 809 810 static inline void __xfrm_state_put(struct xfrm_state *x) 811 { 812 refcount_dec(&x->refcnt); 813 } 814 815 static inline void xfrm_state_put(struct xfrm_state *x) 816 { 817 if (refcount_dec_and_test(&x->refcnt)) 818 __xfrm_state_destroy(x, false); 819 } 820 821 static inline void xfrm_state_put_sync(struct xfrm_state *x) 822 { 823 if (refcount_dec_and_test(&x->refcnt)) 824 __xfrm_state_destroy(x, true); 825 } 826 827 static inline void xfrm_state_hold(struct xfrm_state *x) 828 { 829 refcount_inc(&x->refcnt); 830 } 831 832 static inline bool addr_match(const void *token1, const void *token2, 833 unsigned int prefixlen) 834 { 835 const __be32 *a1 = token1; 836 const __be32 *a2 = token2; 837 unsigned int pdw; 838 unsigned int pbi; 839 840 pdw = prefixlen >> 5; /* num of whole u32 in prefix */ 841 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 842 843 if (pdw) 844 if (memcmp(a1, a2, pdw << 2)) 845 return false; 846 847 if (pbi) { 848 __be32 mask; 849 850 mask = htonl((0xffffffff) << (32 - pbi)); 851 852 if ((a1[pdw] ^ a2[pdw]) & mask) 853 return false; 854 } 855 856 return true; 857 } 858 859 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen) 860 { 861 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */ 862 if (sizeof(long) == 4 && prefixlen == 0) 863 return true; 864 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen))); 865 } 866 867 static __inline__ 868 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli) 869 { 870 __be16 port; 871 switch(fl->flowi_proto) { 872 case IPPROTO_TCP: 873 case IPPROTO_UDP: 874 case IPPROTO_UDPLITE: 875 case IPPROTO_SCTP: 876 port = uli->ports.sport; 877 break; 878 case IPPROTO_ICMP: 879 case IPPROTO_ICMPV6: 880 port = htons(uli->icmpt.type); 881 break; 882 case IPPROTO_MH: 883 port = htons(uli->mht.type); 884 break; 885 case IPPROTO_GRE: 886 port = htons(ntohl(uli->gre_key) >> 16); 887 break; 888 default: 889 port = 0; /*XXX*/ 890 } 891 return port; 892 } 893 894 static __inline__ 895 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli) 896 { 897 __be16 port; 898 switch(fl->flowi_proto) { 899 case IPPROTO_TCP: 900 case IPPROTO_UDP: 901 case IPPROTO_UDPLITE: 902 case IPPROTO_SCTP: 903 port = uli->ports.dport; 904 break; 905 case IPPROTO_ICMP: 906 case IPPROTO_ICMPV6: 907 port = htons(uli->icmpt.code); 908 break; 909 case IPPROTO_GRE: 910 port = htons(ntohl(uli->gre_key) & 0xffff); 911 break; 912 default: 913 port = 0; /*XXX*/ 914 } 915 return port; 916 } 917 918 bool xfrm_selector_match(const struct xfrm_selector *sel, 919 const struct flowi *fl, unsigned short family); 920 921 #ifdef CONFIG_SECURITY_NETWORK_XFRM 922 /* If neither has a context --> match 923 * Otherwise, both must have a context and the sids, doi, alg must match 924 */ 925 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 926 { 927 return ((!s1 && !s2) || 928 (s1 && s2 && 929 (s1->ctx_sid == s2->ctx_sid) && 930 (s1->ctx_doi == s2->ctx_doi) && 931 (s1->ctx_alg == s2->ctx_alg))); 932 } 933 #else 934 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 935 { 936 return true; 937 } 938 #endif 939 940 /* A struct encoding bundle of transformations to apply to some set of flow. 941 * 942 * xdst->child points to the next element of bundle. 943 * dst->xfrm points to an instanse of transformer. 944 * 945 * Due to unfortunate limitations of current routing cache, which we 946 * have no time to fix, it mirrors struct rtable and bound to the same 947 * routing key, including saddr,daddr. However, we can have many of 948 * bundles differing by session id. All the bundles grow from a parent 949 * policy rule. 950 */ 951 struct xfrm_dst { 952 union { 953 struct dst_entry dst; 954 struct rtable rt; 955 struct rt6_info rt6; 956 } u; 957 struct dst_entry *route; 958 struct dst_entry *child; 959 struct dst_entry *path; 960 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; 961 int num_pols, num_xfrms; 962 u32 xfrm_genid; 963 u32 policy_genid; 964 u32 route_mtu_cached; 965 u32 child_mtu_cached; 966 u32 route_cookie; 967 u32 path_cookie; 968 }; 969 970 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst) 971 { 972 #ifdef CONFIG_XFRM 973 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) { 974 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst; 975 976 return xdst->path; 977 } 978 #endif 979 return (struct dst_entry *) dst; 980 } 981 982 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst) 983 { 984 #ifdef CONFIG_XFRM 985 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) { 986 struct xfrm_dst *xdst = (struct xfrm_dst *) dst; 987 return xdst->child; 988 } 989 #endif 990 return NULL; 991 } 992 993 #ifdef CONFIG_XFRM 994 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child) 995 { 996 xdst->child = child; 997 } 998 999 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 1000 { 1001 xfrm_pols_put(xdst->pols, xdst->num_pols); 1002 dst_release(xdst->route); 1003 if (likely(xdst->u.dst.xfrm)) 1004 xfrm_state_put(xdst->u.dst.xfrm); 1005 } 1006 #endif 1007 1008 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 1009 1010 struct xfrm_if_parms { 1011 int link; /* ifindex of underlying L2 interface */ 1012 u32 if_id; /* interface identifyer */ 1013 bool collect_md; 1014 }; 1015 1016 struct xfrm_if { 1017 struct xfrm_if __rcu *next; /* next interface in list */ 1018 struct net_device *dev; /* virtual device associated with interface */ 1019 struct net *net; /* netns for packet i/o */ 1020 struct xfrm_if_parms p; /* interface parms */ 1021 1022 struct gro_cells gro_cells; 1023 }; 1024 1025 struct xfrm_offload { 1026 /* Output sequence number for replay protection on offloading. */ 1027 struct { 1028 __u32 low; 1029 __u32 hi; 1030 } seq; 1031 1032 __u32 flags; 1033 #define SA_DELETE_REQ 1 1034 #define CRYPTO_DONE 2 1035 #define CRYPTO_NEXT_DONE 4 1036 #define CRYPTO_FALLBACK 8 1037 #define XFRM_GSO_SEGMENT 16 1038 #define XFRM_GRO 32 1039 /* 64 is free */ 1040 #define XFRM_DEV_RESUME 128 1041 #define XFRM_XMIT 256 1042 1043 __u32 status; 1044 #define CRYPTO_SUCCESS 1 1045 #define CRYPTO_GENERIC_ERROR 2 1046 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4 1047 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8 1048 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16 1049 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32 1050 #define CRYPTO_INVALID_PACKET_SYNTAX 64 1051 #define CRYPTO_INVALID_PROTOCOL 128 1052 1053 /* Used to keep whole l2 header for transport mode GRO */ 1054 __u32 orig_mac_len; 1055 1056 __u8 proto; 1057 __u8 inner_ipproto; 1058 }; 1059 1060 struct sec_path { 1061 int len; 1062 int olen; 1063 int verified_cnt; 1064 1065 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 1066 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH]; 1067 }; 1068 1069 struct sec_path *secpath_set(struct sk_buff *skb); 1070 1071 static inline void 1072 secpath_reset(struct sk_buff *skb) 1073 { 1074 #ifdef CONFIG_XFRM 1075 skb_ext_del(skb, SKB_EXT_SEC_PATH); 1076 #endif 1077 } 1078 1079 static inline int 1080 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family) 1081 { 1082 switch (family) { 1083 case AF_INET: 1084 return addr->a4 == 0; 1085 case AF_INET6: 1086 return ipv6_addr_any(&addr->in6); 1087 } 1088 return 0; 1089 } 1090 1091 static inline int 1092 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1093 { 1094 return (tmpl->saddr.a4 && 1095 tmpl->saddr.a4 != x->props.saddr.a4); 1096 } 1097 1098 static inline int 1099 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1100 { 1101 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 1102 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 1103 } 1104 1105 static inline int 1106 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family) 1107 { 1108 switch (family) { 1109 case AF_INET: 1110 return __xfrm4_state_addr_cmp(tmpl, x); 1111 case AF_INET6: 1112 return __xfrm6_state_addr_cmp(tmpl, x); 1113 } 1114 return !0; 1115 } 1116 1117 #ifdef CONFIG_XFRM 1118 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) 1119 { 1120 struct sec_path *sp = skb_sec_path(skb); 1121 1122 return sp->xvec[sp->len - 1]; 1123 } 1124 #endif 1125 1126 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb) 1127 { 1128 #ifdef CONFIG_XFRM 1129 struct sec_path *sp = skb_sec_path(skb); 1130 1131 if (!sp || !sp->olen || sp->len != sp->olen) 1132 return NULL; 1133 1134 return &sp->ovec[sp->olen - 1]; 1135 #else 1136 return NULL; 1137 #endif 1138 } 1139 1140 #ifdef CONFIG_XFRM 1141 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, 1142 unsigned short family); 1143 1144 static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb, 1145 int dir) 1146 { 1147 if (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) 1148 return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT; 1149 1150 return false; 1151 } 1152 1153 static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb, 1154 int dir, unsigned short family) 1155 { 1156 if (dir != XFRM_POLICY_OUT && family == AF_INET) { 1157 /* same dst may be used for traffic originating from 1158 * devices with different policy settings. 1159 */ 1160 return IPCB(skb)->flags & IPSKB_NOPOLICY; 1161 } 1162 return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY); 1163 } 1164 1165 static inline int __xfrm_policy_check2(struct sock *sk, int dir, 1166 struct sk_buff *skb, 1167 unsigned int family, int reverse) 1168 { 1169 struct net *net = dev_net(skb->dev); 1170 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); 1171 struct xfrm_offload *xo = xfrm_offload(skb); 1172 struct xfrm_state *x; 1173 1174 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 1175 return __xfrm_policy_check(sk, ndir, skb, family); 1176 1177 if (xo) { 1178 x = xfrm_input_state(skb); 1179 if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET) 1180 return (xo->flags & CRYPTO_DONE) && 1181 (xo->status & CRYPTO_SUCCESS); 1182 } 1183 1184 return __xfrm_check_nopolicy(net, skb, dir) || 1185 __xfrm_check_dev_nopolicy(skb, dir, family) || 1186 __xfrm_policy_check(sk, ndir, skb, family); 1187 } 1188 1189 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1190 { 1191 return __xfrm_policy_check2(sk, dir, skb, family, 0); 1192 } 1193 1194 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1195 { 1196 return xfrm_policy_check(sk, dir, skb, AF_INET); 1197 } 1198 1199 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1200 { 1201 return xfrm_policy_check(sk, dir, skb, AF_INET6); 1202 } 1203 1204 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1205 struct sk_buff *skb) 1206 { 1207 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); 1208 } 1209 1210 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1211 struct sk_buff *skb) 1212 { 1213 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); 1214 } 1215 1216 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1217 unsigned int family, int reverse); 1218 1219 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1220 unsigned int family) 1221 { 1222 return __xfrm_decode_session(skb, fl, family, 0); 1223 } 1224 1225 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1226 struct flowi *fl, 1227 unsigned int family) 1228 { 1229 return __xfrm_decode_session(skb, fl, family, 1); 1230 } 1231 1232 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 1233 1234 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 1235 { 1236 struct net *net = dev_net(skb->dev); 1237 1238 if (!net->xfrm.policy_count[XFRM_POLICY_OUT] && 1239 net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT) 1240 return true; 1241 1242 return (skb_dst(skb)->flags & DST_NOXFRM) || 1243 __xfrm_route_forward(skb, family); 1244 } 1245 1246 static inline int xfrm4_route_forward(struct sk_buff *skb) 1247 { 1248 return xfrm_route_forward(skb, AF_INET); 1249 } 1250 1251 static inline int xfrm6_route_forward(struct sk_buff *skb) 1252 { 1253 return xfrm_route_forward(skb, AF_INET6); 1254 } 1255 1256 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk); 1257 1258 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) 1259 { 1260 if (!sk_fullsock(osk)) 1261 return 0; 1262 sk->sk_policy[0] = NULL; 1263 sk->sk_policy[1] = NULL; 1264 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1])) 1265 return __xfrm_sk_clone_policy(sk, osk); 1266 return 0; 1267 } 1268 1269 int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 1270 1271 static inline void xfrm_sk_free_policy(struct sock *sk) 1272 { 1273 struct xfrm_policy *pol; 1274 1275 pol = rcu_dereference_protected(sk->sk_policy[0], 1); 1276 if (unlikely(pol != NULL)) { 1277 xfrm_policy_delete(pol, XFRM_POLICY_MAX); 1278 sk->sk_policy[0] = NULL; 1279 } 1280 pol = rcu_dereference_protected(sk->sk_policy[1], 1); 1281 if (unlikely(pol != NULL)) { 1282 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1); 1283 sk->sk_policy[1] = NULL; 1284 } 1285 } 1286 1287 #else 1288 1289 static inline void xfrm_sk_free_policy(struct sock *sk) {} 1290 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; } 1291 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 1292 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 1293 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1294 { 1295 return 1; 1296 } 1297 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1298 { 1299 return 1; 1300 } 1301 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1302 { 1303 return 1; 1304 } 1305 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1306 struct flowi *fl, 1307 unsigned int family) 1308 { 1309 return -ENOSYS; 1310 } 1311 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1312 struct sk_buff *skb) 1313 { 1314 return 1; 1315 } 1316 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1317 struct sk_buff *skb) 1318 { 1319 return 1; 1320 } 1321 #endif 1322 1323 static __inline__ 1324 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family) 1325 { 1326 switch (family){ 1327 case AF_INET: 1328 return (xfrm_address_t *)&fl->u.ip4.daddr; 1329 case AF_INET6: 1330 return (xfrm_address_t *)&fl->u.ip6.daddr; 1331 } 1332 return NULL; 1333 } 1334 1335 static __inline__ 1336 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family) 1337 { 1338 switch (family){ 1339 case AF_INET: 1340 return (xfrm_address_t *)&fl->u.ip4.saddr; 1341 case AF_INET6: 1342 return (xfrm_address_t *)&fl->u.ip6.saddr; 1343 } 1344 return NULL; 1345 } 1346 1347 static __inline__ 1348 void xfrm_flowi_addr_get(const struct flowi *fl, 1349 xfrm_address_t *saddr, xfrm_address_t *daddr, 1350 unsigned short family) 1351 { 1352 switch(family) { 1353 case AF_INET: 1354 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4)); 1355 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4)); 1356 break; 1357 case AF_INET6: 1358 saddr->in6 = fl->u.ip6.saddr; 1359 daddr->in6 = fl->u.ip6.daddr; 1360 break; 1361 } 1362 } 1363 1364 static __inline__ int 1365 __xfrm4_state_addr_check(const struct xfrm_state *x, 1366 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1367 { 1368 if (daddr->a4 == x->id.daddr.a4 && 1369 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 1370 return 1; 1371 return 0; 1372 } 1373 1374 static __inline__ int 1375 __xfrm6_state_addr_check(const struct xfrm_state *x, 1376 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1377 { 1378 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 1379 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) || 1380 ipv6_addr_any((struct in6_addr *)saddr) || 1381 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 1382 return 1; 1383 return 0; 1384 } 1385 1386 static __inline__ int 1387 xfrm_state_addr_check(const struct xfrm_state *x, 1388 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1389 unsigned short family) 1390 { 1391 switch (family) { 1392 case AF_INET: 1393 return __xfrm4_state_addr_check(x, daddr, saddr); 1394 case AF_INET6: 1395 return __xfrm6_state_addr_check(x, daddr, saddr); 1396 } 1397 return 0; 1398 } 1399 1400 static __inline__ int 1401 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl, 1402 unsigned short family) 1403 { 1404 switch (family) { 1405 case AF_INET: 1406 return __xfrm4_state_addr_check(x, 1407 (const xfrm_address_t *)&fl->u.ip4.daddr, 1408 (const xfrm_address_t *)&fl->u.ip4.saddr); 1409 case AF_INET6: 1410 return __xfrm6_state_addr_check(x, 1411 (const xfrm_address_t *)&fl->u.ip6.daddr, 1412 (const xfrm_address_t *)&fl->u.ip6.saddr); 1413 } 1414 return 0; 1415 } 1416 1417 static inline int xfrm_state_kern(const struct xfrm_state *x) 1418 { 1419 return atomic_read(&x->tunnel_users); 1420 } 1421 1422 static inline bool xfrm_id_proto_valid(u8 proto) 1423 { 1424 switch (proto) { 1425 case IPPROTO_AH: 1426 case IPPROTO_ESP: 1427 case IPPROTO_COMP: 1428 #if IS_ENABLED(CONFIG_IPV6) 1429 case IPPROTO_ROUTING: 1430 case IPPROTO_DSTOPTS: 1431 #endif 1432 return true; 1433 default: 1434 return false; 1435 } 1436 } 1437 1438 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */ 1439 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 1440 { 1441 return (!userproto || proto == userproto || 1442 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 1443 proto == IPPROTO_ESP || 1444 proto == IPPROTO_COMP))); 1445 } 1446 1447 /* 1448 * xfrm algorithm information 1449 */ 1450 struct xfrm_algo_aead_info { 1451 char *geniv; 1452 u16 icv_truncbits; 1453 }; 1454 1455 struct xfrm_algo_auth_info { 1456 u16 icv_truncbits; 1457 u16 icv_fullbits; 1458 }; 1459 1460 struct xfrm_algo_encr_info { 1461 char *geniv; 1462 u16 blockbits; 1463 u16 defkeybits; 1464 }; 1465 1466 struct xfrm_algo_comp_info { 1467 u16 threshold; 1468 }; 1469 1470 struct xfrm_algo_desc { 1471 char *name; 1472 char *compat; 1473 u8 available:1; 1474 u8 pfkey_supported:1; 1475 union { 1476 struct xfrm_algo_aead_info aead; 1477 struct xfrm_algo_auth_info auth; 1478 struct xfrm_algo_encr_info encr; 1479 struct xfrm_algo_comp_info comp; 1480 } uinfo; 1481 struct sadb_alg desc; 1482 }; 1483 1484 /* XFRM protocol handlers. */ 1485 struct xfrm4_protocol { 1486 int (*handler)(struct sk_buff *skb); 1487 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1488 int encap_type); 1489 int (*cb_handler)(struct sk_buff *skb, int err); 1490 int (*err_handler)(struct sk_buff *skb, u32 info); 1491 1492 struct xfrm4_protocol __rcu *next; 1493 int priority; 1494 }; 1495 1496 struct xfrm6_protocol { 1497 int (*handler)(struct sk_buff *skb); 1498 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1499 int encap_type); 1500 int (*cb_handler)(struct sk_buff *skb, int err); 1501 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1502 u8 type, u8 code, int offset, __be32 info); 1503 1504 struct xfrm6_protocol __rcu *next; 1505 int priority; 1506 }; 1507 1508 /* XFRM tunnel handlers. */ 1509 struct xfrm_tunnel { 1510 int (*handler)(struct sk_buff *skb); 1511 int (*cb_handler)(struct sk_buff *skb, int err); 1512 int (*err_handler)(struct sk_buff *skb, u32 info); 1513 1514 struct xfrm_tunnel __rcu *next; 1515 int priority; 1516 }; 1517 1518 struct xfrm6_tunnel { 1519 int (*handler)(struct sk_buff *skb); 1520 int (*cb_handler)(struct sk_buff *skb, int err); 1521 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1522 u8 type, u8 code, int offset, __be32 info); 1523 struct xfrm6_tunnel __rcu *next; 1524 int priority; 1525 }; 1526 1527 void xfrm_init(void); 1528 void xfrm4_init(void); 1529 int xfrm_state_init(struct net *net); 1530 void xfrm_state_fini(struct net *net); 1531 void xfrm4_state_init(void); 1532 void xfrm4_protocol_init(void); 1533 #ifdef CONFIG_XFRM 1534 int xfrm6_init(void); 1535 void xfrm6_fini(void); 1536 int xfrm6_state_init(void); 1537 void xfrm6_state_fini(void); 1538 int xfrm6_protocol_init(void); 1539 void xfrm6_protocol_fini(void); 1540 #else 1541 static inline int xfrm6_init(void) 1542 { 1543 return 0; 1544 } 1545 static inline void xfrm6_fini(void) 1546 { 1547 ; 1548 } 1549 #endif 1550 1551 #ifdef CONFIG_XFRM_STATISTICS 1552 int xfrm_proc_init(struct net *net); 1553 void xfrm_proc_fini(struct net *net); 1554 #endif 1555 1556 int xfrm_sysctl_init(struct net *net); 1557 #ifdef CONFIG_SYSCTL 1558 void xfrm_sysctl_fini(struct net *net); 1559 #else 1560 static inline void xfrm_sysctl_fini(struct net *net) 1561 { 1562 } 1563 #endif 1564 1565 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 1566 struct xfrm_address_filter *filter); 1567 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1568 int (*func)(struct xfrm_state *, int, void*), void *); 1569 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net); 1570 struct xfrm_state *xfrm_state_alloc(struct net *net); 1571 void xfrm_state_free(struct xfrm_state *x); 1572 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr, 1573 const xfrm_address_t *saddr, 1574 const struct flowi *fl, 1575 struct xfrm_tmpl *tmpl, 1576 struct xfrm_policy *pol, int *err, 1577 unsigned short family, u32 if_id); 1578 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id, 1579 xfrm_address_t *daddr, 1580 xfrm_address_t *saddr, 1581 unsigned short family, 1582 u8 mode, u8 proto, u32 reqid); 1583 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1584 unsigned short family); 1585 int xfrm_state_check_expire(struct xfrm_state *x); 1586 #ifdef CONFIG_XFRM_OFFLOAD 1587 static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x) 1588 { 1589 struct xfrm_dev_offload *xdo = &x->xso; 1590 struct net_device *dev = READ_ONCE(xdo->dev); 1591 1592 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET) 1593 return; 1594 1595 if (dev && dev->xfrmdev_ops && 1596 dev->xfrmdev_ops->xdo_dev_state_update_curlft) 1597 dev->xfrmdev_ops->xdo_dev_state_update_curlft(x); 1598 1599 } 1600 #else 1601 static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x) {} 1602 #endif 1603 void xfrm_state_insert(struct xfrm_state *x); 1604 int xfrm_state_add(struct xfrm_state *x); 1605 int xfrm_state_update(struct xfrm_state *x); 1606 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark, 1607 const xfrm_address_t *daddr, __be32 spi, 1608 u8 proto, unsigned short family); 1609 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1610 const xfrm_address_t *daddr, 1611 const xfrm_address_t *saddr, 1612 u8 proto, 1613 unsigned short family); 1614 #ifdef CONFIG_XFRM_SUB_POLICY 1615 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1616 unsigned short family); 1617 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1618 unsigned short family); 1619 #else 1620 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s, 1621 int n, unsigned short family) 1622 { 1623 } 1624 1625 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s, 1626 int n, unsigned short family) 1627 { 1628 } 1629 #endif 1630 1631 struct xfrmk_sadinfo { 1632 u32 sadhcnt; /* current hash bkts */ 1633 u32 sadhmcnt; /* max allowed hash bkts */ 1634 u32 sadcnt; /* current running count */ 1635 }; 1636 1637 struct xfrmk_spdinfo { 1638 u32 incnt; 1639 u32 outcnt; 1640 u32 fwdcnt; 1641 u32 inscnt; 1642 u32 outscnt; 1643 u32 fwdscnt; 1644 u32 spdhcnt; 1645 u32 spdhmcnt; 1646 }; 1647 1648 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1649 int xfrm_state_delete(struct xfrm_state *x); 1650 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync); 1651 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid); 1652 int xfrm_dev_policy_flush(struct net *net, struct net_device *dev, 1653 bool task_valid); 1654 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); 1655 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); 1656 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq); 1657 int xfrm_init_replay(struct xfrm_state *x, struct netlink_ext_ack *extack); 1658 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu); 1659 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload, 1660 struct netlink_ext_ack *extack); 1661 int xfrm_init_state(struct xfrm_state *x); 1662 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type); 1663 int xfrm_input_resume(struct sk_buff *skb, int nexthdr); 1664 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb, 1665 int (*finish)(struct net *, struct sock *, 1666 struct sk_buff *)); 1667 int xfrm_trans_queue(struct sk_buff *skb, 1668 int (*finish)(struct net *, struct sock *, 1669 struct sk_buff *)); 1670 int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err); 1671 int xfrm_output(struct sock *sk, struct sk_buff *skb); 1672 1673 #if IS_ENABLED(CONFIG_NET_PKTGEN) 1674 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb); 1675 #endif 1676 1677 void xfrm_local_error(struct sk_buff *skb, int mtu); 1678 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1679 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1680 int encap_type); 1681 int xfrm4_transport_finish(struct sk_buff *skb, int async); 1682 int xfrm4_rcv(struct sk_buff *skb); 1683 1684 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1685 { 1686 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL; 1687 XFRM_SPI_SKB_CB(skb)->family = AF_INET; 1688 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); 1689 return xfrm_input(skb, nexthdr, spi, 0); 1690 } 1691 1692 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1693 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol); 1694 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol); 1695 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1696 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1697 void xfrm4_local_error(struct sk_buff *skb, u32 mtu); 1698 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1699 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi, 1700 struct ip6_tnl *t); 1701 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1702 int encap_type); 1703 int xfrm6_transport_finish(struct sk_buff *skb, int async); 1704 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t); 1705 int xfrm6_rcv(struct sk_buff *skb); 1706 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1707 xfrm_address_t *saddr, u8 proto); 1708 void xfrm6_local_error(struct sk_buff *skb, u32 mtu); 1709 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol); 1710 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol); 1711 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1712 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1713 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr); 1714 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr); 1715 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1716 1717 #ifdef CONFIG_XFRM 1718 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu); 1719 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1720 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1721 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, 1722 int optlen); 1723 #else 1724 static inline int xfrm_user_policy(struct sock *sk, int optname, 1725 sockptr_t optval, int optlen) 1726 { 1727 return -ENOPROTOOPT; 1728 } 1729 #endif 1730 1731 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif, 1732 const xfrm_address_t *saddr, 1733 const xfrm_address_t *daddr, 1734 int family, u32 mark); 1735 1736 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); 1737 1738 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); 1739 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, 1740 int (*func)(struct xfrm_policy *, int, int, void*), 1741 void *); 1742 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net); 1743 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1744 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, 1745 const struct xfrm_mark *mark, 1746 u32 if_id, u8 type, int dir, 1747 struct xfrm_selector *sel, 1748 struct xfrm_sec_ctx *ctx, int delete, 1749 int *err); 1750 struct xfrm_policy *xfrm_policy_byid(struct net *net, 1751 const struct xfrm_mark *mark, u32 if_id, 1752 u8 type, int dir, u32 id, int delete, 1753 int *err); 1754 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid); 1755 void xfrm_policy_hash_rebuild(struct net *net); 1756 u32 xfrm_get_acqseq(void); 1757 int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack); 1758 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi, 1759 struct netlink_ext_ack *extack); 1760 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, 1761 u8 mode, u32 reqid, u32 if_id, u8 proto, 1762 const xfrm_address_t *daddr, 1763 const xfrm_address_t *saddr, int create, 1764 unsigned short family); 1765 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1766 1767 #ifdef CONFIG_XFRM_MIGRATE 1768 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1769 const struct xfrm_migrate *m, int num_bundles, 1770 const struct xfrm_kmaddress *k, 1771 const struct xfrm_encap_tmpl *encap); 1772 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net, 1773 u32 if_id); 1774 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 1775 struct xfrm_migrate *m, 1776 struct xfrm_encap_tmpl *encap); 1777 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1778 struct xfrm_migrate *m, int num_bundles, 1779 struct xfrm_kmaddress *k, struct net *net, 1780 struct xfrm_encap_tmpl *encap, u32 if_id, 1781 struct netlink_ext_ack *extack); 1782 #endif 1783 1784 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1785 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid); 1786 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, 1787 xfrm_address_t *addr); 1788 1789 void xfrm_input_init(void); 1790 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1791 1792 void xfrm_probe_algs(void); 1793 int xfrm_count_pfkey_auth_supported(void); 1794 int xfrm_count_pfkey_enc_supported(void); 1795 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1796 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1797 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1798 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1799 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1800 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe); 1801 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe); 1802 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe); 1803 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, 1804 int probe); 1805 1806 static inline bool xfrm6_addr_equal(const xfrm_address_t *a, 1807 const xfrm_address_t *b) 1808 { 1809 return ipv6_addr_equal((const struct in6_addr *)a, 1810 (const struct in6_addr *)b); 1811 } 1812 1813 static inline bool xfrm_addr_equal(const xfrm_address_t *a, 1814 const xfrm_address_t *b, 1815 sa_family_t family) 1816 { 1817 switch (family) { 1818 default: 1819 case AF_INET: 1820 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0; 1821 case AF_INET6: 1822 return xfrm6_addr_equal(a, b); 1823 } 1824 } 1825 1826 static inline int xfrm_policy_id2dir(u32 index) 1827 { 1828 return index & 7; 1829 } 1830 1831 #ifdef CONFIG_XFRM 1832 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq); 1833 int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq); 1834 void xfrm_replay_notify(struct xfrm_state *x, int event); 1835 int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb); 1836 int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq); 1837 1838 static inline int xfrm_aevent_is_on(struct net *net) 1839 { 1840 struct sock *nlsk; 1841 int ret = 0; 1842 1843 rcu_read_lock(); 1844 nlsk = rcu_dereference(net->xfrm.nlsk); 1845 if (nlsk) 1846 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1847 rcu_read_unlock(); 1848 return ret; 1849 } 1850 1851 static inline int xfrm_acquire_is_on(struct net *net) 1852 { 1853 struct sock *nlsk; 1854 int ret = 0; 1855 1856 rcu_read_lock(); 1857 nlsk = rcu_dereference(net->xfrm.nlsk); 1858 if (nlsk) 1859 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE); 1860 rcu_read_unlock(); 1861 1862 return ret; 1863 } 1864 #endif 1865 1866 static inline unsigned int aead_len(struct xfrm_algo_aead *alg) 1867 { 1868 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1869 } 1870 1871 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg) 1872 { 1873 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1874 } 1875 1876 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg) 1877 { 1878 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1879 } 1880 1881 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn) 1882 { 1883 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32); 1884 } 1885 1886 #ifdef CONFIG_XFRM_MIGRATE 1887 static inline int xfrm_replay_clone(struct xfrm_state *x, 1888 struct xfrm_state *orig) 1889 { 1890 1891 x->replay_esn = kmemdup(orig->replay_esn, 1892 xfrm_replay_state_esn_len(orig->replay_esn), 1893 GFP_KERNEL); 1894 if (!x->replay_esn) 1895 return -ENOMEM; 1896 x->preplay_esn = kmemdup(orig->preplay_esn, 1897 xfrm_replay_state_esn_len(orig->preplay_esn), 1898 GFP_KERNEL); 1899 if (!x->preplay_esn) 1900 return -ENOMEM; 1901 1902 return 0; 1903 } 1904 1905 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig) 1906 { 1907 return kmemdup(orig, aead_len(orig), GFP_KERNEL); 1908 } 1909 1910 1911 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1912 { 1913 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); 1914 } 1915 1916 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig) 1917 { 1918 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL); 1919 } 1920 1921 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1922 { 1923 int i; 1924 for (i = 0; i < n; i++) 1925 xfrm_state_put(*(states + i)); 1926 } 1927 1928 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1929 { 1930 int i; 1931 for (i = 0; i < n; i++) 1932 xfrm_state_delete(*(states + i)); 1933 } 1934 #endif 1935 1936 void __init xfrm_dev_init(void); 1937 1938 #ifdef CONFIG_XFRM_OFFLOAD 1939 void xfrm_dev_resume(struct sk_buff *skb); 1940 void xfrm_dev_backlog(struct softnet_data *sd); 1941 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again); 1942 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, 1943 struct xfrm_user_offload *xuo, 1944 struct netlink_ext_ack *extack); 1945 int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp, 1946 struct xfrm_user_offload *xuo, u8 dir, 1947 struct netlink_ext_ack *extack); 1948 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x); 1949 void xfrm_dev_state_delete(struct xfrm_state *x); 1950 void xfrm_dev_state_free(struct xfrm_state *x); 1951 1952 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 1953 { 1954 struct xfrm_dev_offload *xso = &x->xso; 1955 struct net_device *dev = READ_ONCE(xso->dev); 1956 1957 if (dev && dev->xfrmdev_ops->xdo_dev_state_advance_esn) 1958 dev->xfrmdev_ops->xdo_dev_state_advance_esn(x); 1959 } 1960 1961 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 1962 { 1963 struct xfrm_state *x = dst->xfrm; 1964 struct xfrm_dst *xdst; 1965 1966 if (!x || !x->type_offload) 1967 return false; 1968 1969 xdst = (struct xfrm_dst *) dst; 1970 if (!x->xso.offload_handle && !xdst->child->xfrm) 1971 return true; 1972 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) && 1973 !xdst->child->xfrm) 1974 return true; 1975 1976 return false; 1977 } 1978 1979 static inline void xfrm_dev_policy_delete(struct xfrm_policy *x) 1980 { 1981 struct xfrm_dev_offload *xdo = &x->xdo; 1982 struct net_device *dev = xdo->dev; 1983 1984 if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_policy_delete) 1985 dev->xfrmdev_ops->xdo_dev_policy_delete(x); 1986 } 1987 1988 static inline void xfrm_dev_policy_free(struct xfrm_policy *x) 1989 { 1990 struct xfrm_dev_offload *xdo = &x->xdo; 1991 struct net_device *dev = xdo->dev; 1992 1993 if (dev && dev->xfrmdev_ops) { 1994 if (dev->xfrmdev_ops->xdo_dev_policy_free) 1995 dev->xfrmdev_ops->xdo_dev_policy_free(x); 1996 xdo->dev = NULL; 1997 netdev_put(dev, &xdo->dev_tracker); 1998 } 1999 } 2000 #else 2001 static inline void xfrm_dev_resume(struct sk_buff *skb) 2002 { 2003 } 2004 2005 static inline void xfrm_dev_backlog(struct softnet_data *sd) 2006 { 2007 } 2008 2009 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again) 2010 { 2011 return skb; 2012 } 2013 2014 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo, struct netlink_ext_ack *extack) 2015 { 2016 return 0; 2017 } 2018 2019 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 2020 { 2021 } 2022 2023 static inline void xfrm_dev_state_free(struct xfrm_state *x) 2024 { 2025 } 2026 2027 static inline int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp, 2028 struct xfrm_user_offload *xuo, u8 dir, 2029 struct netlink_ext_ack *extack) 2030 { 2031 return 0; 2032 } 2033 2034 static inline void xfrm_dev_policy_delete(struct xfrm_policy *x) 2035 { 2036 } 2037 2038 static inline void xfrm_dev_policy_free(struct xfrm_policy *x) 2039 { 2040 } 2041 2042 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) 2043 { 2044 return false; 2045 } 2046 2047 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 2048 { 2049 } 2050 2051 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 2052 { 2053 return false; 2054 } 2055 #endif 2056 2057 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) 2058 { 2059 if (attrs[XFRMA_MARK]) 2060 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark)); 2061 else 2062 m->v = m->m = 0; 2063 2064 return m->v & m->m; 2065 } 2066 2067 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m) 2068 { 2069 int ret = 0; 2070 2071 if (m->m | m->v) 2072 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); 2073 return ret; 2074 } 2075 2076 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x) 2077 { 2078 struct xfrm_mark *m = &x->props.smark; 2079 2080 return (m->v & m->m) | (mark & ~m->m); 2081 } 2082 2083 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id) 2084 { 2085 int ret = 0; 2086 2087 if (if_id) 2088 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id); 2089 return ret; 2090 } 2091 2092 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x, 2093 unsigned int family) 2094 { 2095 bool tunnel = false; 2096 2097 switch(family) { 2098 case AF_INET: 2099 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) 2100 tunnel = true; 2101 break; 2102 case AF_INET6: 2103 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) 2104 tunnel = true; 2105 break; 2106 } 2107 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL)) 2108 return -EINVAL; 2109 2110 return 0; 2111 } 2112 2113 extern const int xfrm_msg_min[XFRM_NR_MSGTYPES]; 2114 extern const struct nla_policy xfrma_policy[XFRMA_MAX+1]; 2115 2116 struct xfrm_translator { 2117 /* Allocate frag_list and put compat translation there */ 2118 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src); 2119 2120 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */ 2121 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh, 2122 int maxtype, const struct nla_policy *policy, 2123 struct netlink_ext_ack *extack); 2124 2125 /* Translate 32-bit user_policy from sockptr */ 2126 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen); 2127 2128 struct module *owner; 2129 }; 2130 2131 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT) 2132 extern int xfrm_register_translator(struct xfrm_translator *xtr); 2133 extern int xfrm_unregister_translator(struct xfrm_translator *xtr); 2134 extern struct xfrm_translator *xfrm_get_translator(void); 2135 extern void xfrm_put_translator(struct xfrm_translator *xtr); 2136 #else 2137 static inline struct xfrm_translator *xfrm_get_translator(void) 2138 { 2139 return NULL; 2140 } 2141 static inline void xfrm_put_translator(struct xfrm_translator *xtr) 2142 { 2143 } 2144 #endif 2145 2146 #if IS_ENABLED(CONFIG_IPV6) 2147 static inline bool xfrm6_local_dontfrag(const struct sock *sk) 2148 { 2149 int proto; 2150 2151 if (!sk || sk->sk_family != AF_INET6) 2152 return false; 2153 2154 proto = sk->sk_protocol; 2155 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW) 2156 return inet6_sk(sk)->dontfrag; 2157 2158 return false; 2159 } 2160 #endif 2161 2162 #if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \ 2163 (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES)) 2164 2165 extern struct metadata_dst __percpu *xfrm_bpf_md_dst; 2166 2167 int register_xfrm_interface_bpf(void); 2168 2169 #else 2170 2171 static inline int register_xfrm_interface_bpf(void) 2172 { 2173 return 0; 2174 } 2175 2176 #endif 2177 2178 #endif /* _NET_XFRM_H */ 2179