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 #define XFRM_ADD_STATS(net, field, val) SNMP_ADD_STATS((net)->mib.xfrm_statistics, field, val) 55 #else 56 #define XFRM_INC_STATS(net, field) ((void)(net)) 57 #define XFRM_ADD_STATS(net, field, val) ((void)(net)) 58 #endif 59 60 61 /* Organization of SPD aka "XFRM rules" 62 ------------------------------------ 63 64 Basic objects: 65 - policy rule, struct xfrm_policy (=SPD entry) 66 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) 67 - instance of a transformer, struct xfrm_state (=SA) 68 - template to clone xfrm_state, struct xfrm_tmpl 69 70 SPD is plain linear list of xfrm_policy rules, ordered by priority. 71 (To be compatible with existing pfkeyv2 implementations, 72 many rules with priority of 0x7fffffff are allowed to exist and 73 such rules are ordered in an unpredictable way, thanks to bsd folks.) 74 75 Lookup is plain linear search until the first match with selector. 76 77 If "action" is "block", then we prohibit the flow, otherwise: 78 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, 79 policy entry has list of up to XFRM_MAX_DEPTH transformations, 80 described by templates xfrm_tmpl. Each template is resolved 81 to a complete xfrm_state (see below) and we pack bundle of transformations 82 to a dst_entry returned to requestor. 83 84 dst -. xfrm .-> xfrm_state #1 85 |---. child .-> dst -. xfrm .-> xfrm_state #2 86 |---. child .-> dst -. xfrm .-> xfrm_state #3 87 |---. child .-> NULL 88 89 Bundles are cached at xrfm_policy struct (field ->bundles). 90 91 92 Resolution of xrfm_tmpl 93 ----------------------- 94 Template contains: 95 1. ->mode Mode: transport or tunnel 96 2. ->id.proto Protocol: AH/ESP/IPCOMP 97 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. 98 Q: allow to resolve security gateway? 99 4. ->id.spi If not zero, static SPI. 100 5. ->saddr Local tunnel endpoint, ignored for transport mode. 101 6. ->algos List of allowed algos. Plain bitmask now. 102 Q: ealgos, aalgos, calgos. What a mess... 103 7. ->share Sharing mode. 104 Q: how to implement private sharing mode? To add struct sock* to 105 flow id? 106 107 Having this template we search through SAD searching for entries 108 with appropriate mode/proto/algo, permitted by selector. 109 If no appropriate entry found, it is requested from key manager. 110 111 PROBLEMS: 112 Q: How to find all the bundles referring to a physical path for 113 PMTU discovery? Seems, dst should contain list of all parents... 114 and enter to infinite locking hierarchy disaster. 115 No! It is easier, we will not search for them, let them find us. 116 We add genid to each dst plus pointer to genid of raw IP route, 117 pmtu disc will update pmtu on raw IP route and increase its genid. 118 dst_check() will see this for top level and trigger resyncing 119 metrics. Plus, it will be made via sk->sk_dst_cache. Solved. 120 */ 121 122 struct xfrm_state_walk { 123 struct list_head all; 124 u8 state; 125 u8 dying; 126 u8 proto; 127 u32 seq; 128 struct xfrm_address_filter *filter; 129 }; 130 131 enum { 132 XFRM_DEV_OFFLOAD_IN = 1, 133 XFRM_DEV_OFFLOAD_OUT, 134 XFRM_DEV_OFFLOAD_FWD, 135 }; 136 137 enum { 138 XFRM_DEV_OFFLOAD_UNSPECIFIED, 139 XFRM_DEV_OFFLOAD_CRYPTO, 140 XFRM_DEV_OFFLOAD_PACKET, 141 }; 142 143 enum { 144 XFRM_DEV_OFFLOAD_FLAG_ACQ = 1, 145 }; 146 147 struct xfrm_dev_offload { 148 struct net_device *dev; 149 netdevice_tracker dev_tracker; 150 struct net_device *real_dev; 151 unsigned long offload_handle; 152 u8 dir : 2; 153 u8 type : 2; 154 u8 flags : 2; 155 }; 156 157 struct xfrm_mode { 158 u8 encap; 159 u8 family; 160 u8 flags; 161 }; 162 163 /* Flags for xfrm_mode. */ 164 enum { 165 XFRM_MODE_FLAG_TUNNEL = 1, 166 }; 167 168 enum xfrm_replay_mode { 169 XFRM_REPLAY_MODE_LEGACY, 170 XFRM_REPLAY_MODE_BMP, 171 XFRM_REPLAY_MODE_ESN, 172 }; 173 174 /* Full description of state of transformer. */ 175 struct xfrm_state { 176 possible_net_t xs_net; 177 union { 178 struct hlist_node gclist; 179 struct hlist_node bydst; 180 }; 181 struct hlist_node bysrc; 182 struct hlist_node byspi; 183 struct hlist_node byseq; 184 185 refcount_t refcnt; 186 spinlock_t lock; 187 188 struct xfrm_id id; 189 struct xfrm_selector sel; 190 struct xfrm_mark mark; 191 u32 if_id; 192 u32 tfcpad; 193 194 u32 genid; 195 196 /* Key manager bits */ 197 struct xfrm_state_walk km; 198 199 /* Parameters of this state. */ 200 struct { 201 u32 reqid; 202 u8 mode; 203 u8 replay_window; 204 u8 aalgo, ealgo, calgo; 205 u8 flags; 206 u16 family; 207 xfrm_address_t saddr; 208 int header_len; 209 int trailer_len; 210 u32 extra_flags; 211 struct xfrm_mark smark; 212 } props; 213 214 struct xfrm_lifetime_cfg lft; 215 216 /* Data for transformer */ 217 struct xfrm_algo_auth *aalg; 218 struct xfrm_algo *ealg; 219 struct xfrm_algo *calg; 220 struct xfrm_algo_aead *aead; 221 const char *geniv; 222 223 /* mapping change rate limiting */ 224 __be16 new_mapping_sport; 225 u32 new_mapping; /* seconds */ 226 u32 mapping_maxage; /* seconds for input SA */ 227 228 /* Data for encapsulator */ 229 struct xfrm_encap_tmpl *encap; 230 struct sock __rcu *encap_sk; 231 232 /* Data for care-of address */ 233 xfrm_address_t *coaddr; 234 235 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 236 struct xfrm_state *tunnel; 237 238 /* If a tunnel, number of users + 1 */ 239 atomic_t tunnel_users; 240 241 /* State for replay detection */ 242 struct xfrm_replay_state replay; 243 struct xfrm_replay_state_esn *replay_esn; 244 245 /* Replay detection state at the time we sent the last notification */ 246 struct xfrm_replay_state preplay; 247 struct xfrm_replay_state_esn *preplay_esn; 248 249 /* replay detection mode */ 250 enum xfrm_replay_mode repl_mode; 251 /* internal flag that only holds state for delayed aevent at the 252 * moment 253 */ 254 u32 xflags; 255 256 /* Replay detection notification settings */ 257 u32 replay_maxage; 258 u32 replay_maxdiff; 259 260 /* Replay detection notification timer */ 261 struct timer_list rtimer; 262 263 /* Statistics */ 264 struct xfrm_stats stats; 265 266 struct xfrm_lifetime_cur curlft; 267 struct hrtimer mtimer; 268 269 struct xfrm_dev_offload xso; 270 271 /* used to fix curlft->add_time when changing date */ 272 long saved_tmo; 273 274 /* Last used time */ 275 time64_t lastused; 276 277 struct page_frag xfrag; 278 279 /* Reference to data common to all the instances of this 280 * transformer. */ 281 const struct xfrm_type *type; 282 struct xfrm_mode inner_mode; 283 struct xfrm_mode inner_mode_iaf; 284 struct xfrm_mode outer_mode; 285 286 const struct xfrm_type_offload *type_offload; 287 288 /* Security context */ 289 struct xfrm_sec_ctx *security; 290 291 /* Private data of this transformer, format is opaque, 292 * interpreted by xfrm_type methods. */ 293 void *data; 294 }; 295 296 static inline struct net *xs_net(struct xfrm_state *x) 297 { 298 return read_pnet(&x->xs_net); 299 } 300 301 /* xflags - make enum if more show up */ 302 #define XFRM_TIME_DEFER 1 303 #define XFRM_SOFT_EXPIRE 2 304 305 enum { 306 XFRM_STATE_VOID, 307 XFRM_STATE_ACQ, 308 XFRM_STATE_VALID, 309 XFRM_STATE_ERROR, 310 XFRM_STATE_EXPIRED, 311 XFRM_STATE_DEAD 312 }; 313 314 /* callback structure passed from either netlink or pfkey */ 315 struct km_event { 316 union { 317 u32 hard; 318 u32 proto; 319 u32 byid; 320 u32 aevent; 321 u32 type; 322 } data; 323 324 u32 seq; 325 u32 portid; 326 u32 event; 327 struct net *net; 328 }; 329 330 struct xfrm_if_decode_session_result { 331 struct net *net; 332 u32 if_id; 333 }; 334 335 struct xfrm_if_cb { 336 bool (*decode_session)(struct sk_buff *skb, 337 unsigned short family, 338 struct xfrm_if_decode_session_result *res); 339 }; 340 341 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb); 342 void xfrm_if_unregister_cb(void); 343 344 struct net_device; 345 struct xfrm_type; 346 struct xfrm_dst; 347 struct xfrm_policy_afinfo { 348 struct dst_ops *dst_ops; 349 struct dst_entry *(*dst_lookup)(struct net *net, 350 int tos, int oif, 351 const xfrm_address_t *saddr, 352 const xfrm_address_t *daddr, 353 u32 mark); 354 int (*get_saddr)(struct net *net, int oif, 355 xfrm_address_t *saddr, 356 xfrm_address_t *daddr, 357 u32 mark); 358 int (*fill_dst)(struct xfrm_dst *xdst, 359 struct net_device *dev, 360 const struct flowi *fl); 361 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig); 362 }; 363 364 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family); 365 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo); 366 void km_policy_notify(struct xfrm_policy *xp, int dir, 367 const struct km_event *c); 368 void km_state_notify(struct xfrm_state *x, const struct km_event *c); 369 370 struct xfrm_tmpl; 371 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, 372 struct xfrm_policy *pol); 373 void km_state_expired(struct xfrm_state *x, int hard, u32 portid); 374 int __xfrm_state_delete(struct xfrm_state *x); 375 376 struct xfrm_state_afinfo { 377 u8 family; 378 u8 proto; 379 380 const struct xfrm_type_offload *type_offload_esp; 381 382 const struct xfrm_type *type_esp; 383 const struct xfrm_type *type_ipip; 384 const struct xfrm_type *type_ipip6; 385 const struct xfrm_type *type_comp; 386 const struct xfrm_type *type_ah; 387 const struct xfrm_type *type_routing; 388 const struct xfrm_type *type_dstopts; 389 390 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb); 391 int (*transport_finish)(struct sk_buff *skb, 392 int async); 393 void (*local_error)(struct sk_buff *skb, u32 mtu); 394 }; 395 396 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 397 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 398 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); 399 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family); 400 401 struct xfrm_input_afinfo { 402 u8 family; 403 bool is_ipip; 404 int (*callback)(struct sk_buff *skb, u8 protocol, 405 int err); 406 }; 407 408 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo); 409 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo); 410 411 void xfrm_flush_gc(void); 412 void xfrm_state_delete_tunnel(struct xfrm_state *x); 413 414 struct xfrm_type { 415 struct module *owner; 416 u8 proto; 417 u8 flags; 418 #define XFRM_TYPE_NON_FRAGMENT 1 419 #define XFRM_TYPE_REPLAY_PROT 2 420 #define XFRM_TYPE_LOCAL_COADDR 4 421 #define XFRM_TYPE_REMOTE_COADDR 8 422 423 int (*init_state)(struct xfrm_state *x, 424 struct netlink_ext_ack *extack); 425 void (*destructor)(struct xfrm_state *); 426 int (*input)(struct xfrm_state *, struct sk_buff *skb); 427 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 428 int (*reject)(struct xfrm_state *, struct sk_buff *, 429 const struct flowi *); 430 }; 431 432 int xfrm_register_type(const struct xfrm_type *type, unsigned short family); 433 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); 434 435 struct xfrm_type_offload { 436 struct module *owner; 437 u8 proto; 438 void (*encap)(struct xfrm_state *, struct sk_buff *pskb); 439 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb); 440 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features); 441 }; 442 443 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family); 444 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family); 445 446 static inline int xfrm_af2proto(unsigned int family) 447 { 448 switch(family) { 449 case AF_INET: 450 return IPPROTO_IPIP; 451 case AF_INET6: 452 return IPPROTO_IPV6; 453 default: 454 return 0; 455 } 456 } 457 458 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto) 459 { 460 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) || 461 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6)) 462 return &x->inner_mode; 463 else 464 return &x->inner_mode_iaf; 465 } 466 467 struct xfrm_tmpl { 468 /* id in template is interpreted as: 469 * daddr - destination of tunnel, may be zero for transport mode. 470 * spi - zero to acquire spi. Not zero if spi is static, then 471 * daddr must be fixed too. 472 * proto - AH/ESP/IPCOMP 473 */ 474 struct xfrm_id id; 475 476 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 477 xfrm_address_t saddr; 478 479 unsigned short encap_family; 480 481 u32 reqid; 482 483 /* Mode: transport, tunnel etc. */ 484 u8 mode; 485 486 /* Sharing mode: unique, this session only, this user only etc. */ 487 u8 share; 488 489 /* May skip this transfomration if no SA is found */ 490 u8 optional; 491 492 /* Skip aalgos/ealgos/calgos checks. */ 493 u8 allalgs; 494 495 /* Bit mask of algos allowed for acquisition */ 496 u32 aalgos; 497 u32 ealgos; 498 u32 calgos; 499 }; 500 501 #define XFRM_MAX_DEPTH 6 502 #define XFRM_MAX_OFFLOAD_DEPTH 1 503 504 struct xfrm_policy_walk_entry { 505 struct list_head all; 506 u8 dead; 507 }; 508 509 struct xfrm_policy_walk { 510 struct xfrm_policy_walk_entry walk; 511 u8 type; 512 u32 seq; 513 }; 514 515 struct xfrm_policy_queue { 516 struct sk_buff_head hold_queue; 517 struct timer_list hold_timer; 518 unsigned long timeout; 519 }; 520 521 struct xfrm_policy { 522 possible_net_t xp_net; 523 struct hlist_node bydst; 524 struct hlist_node byidx; 525 526 /* This lock only affects elements except for entry. */ 527 rwlock_t lock; 528 refcount_t refcnt; 529 u32 pos; 530 struct timer_list timer; 531 532 atomic_t genid; 533 u32 priority; 534 u32 index; 535 u32 if_id; 536 struct xfrm_mark mark; 537 struct xfrm_selector selector; 538 struct xfrm_lifetime_cfg lft; 539 struct xfrm_lifetime_cur curlft; 540 struct xfrm_policy_walk_entry walk; 541 struct xfrm_policy_queue polq; 542 bool bydst_reinsert; 543 u8 type; 544 u8 action; 545 u8 flags; 546 u8 xfrm_nr; 547 u16 family; 548 struct xfrm_sec_ctx *security; 549 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 550 struct hlist_node bydst_inexact_list; 551 struct rcu_head rcu; 552 553 struct xfrm_dev_offload xdo; 554 }; 555 556 static inline struct net *xp_net(const struct xfrm_policy *xp) 557 { 558 return read_pnet(&xp->xp_net); 559 } 560 561 struct xfrm_kmaddress { 562 xfrm_address_t local; 563 xfrm_address_t remote; 564 u32 reserved; 565 u16 family; 566 }; 567 568 struct xfrm_migrate { 569 xfrm_address_t old_daddr; 570 xfrm_address_t old_saddr; 571 xfrm_address_t new_daddr; 572 xfrm_address_t new_saddr; 573 u8 proto; 574 u8 mode; 575 u16 reserved; 576 u32 reqid; 577 u16 old_family; 578 u16 new_family; 579 }; 580 581 #define XFRM_KM_TIMEOUT 30 582 /* what happened */ 583 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 584 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 585 586 /* default aevent timeout in units of 100ms */ 587 #define XFRM_AE_ETIME 10 588 /* Async Event timer multiplier */ 589 #define XFRM_AE_ETH_M 10 590 /* default seq threshold size */ 591 #define XFRM_AE_SEQT_SIZE 2 592 593 struct xfrm_mgr { 594 struct list_head list; 595 int (*notify)(struct xfrm_state *x, const struct km_event *c); 596 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp); 597 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 598 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 599 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c); 600 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 601 int (*migrate)(const struct xfrm_selector *sel, 602 u8 dir, u8 type, 603 const struct xfrm_migrate *m, 604 int num_bundles, 605 const struct xfrm_kmaddress *k, 606 const struct xfrm_encap_tmpl *encap); 607 bool (*is_alive)(const struct km_event *c); 608 }; 609 610 void xfrm_register_km(struct xfrm_mgr *km); 611 void xfrm_unregister_km(struct xfrm_mgr *km); 612 613 struct xfrm_tunnel_skb_cb { 614 union { 615 struct inet_skb_parm h4; 616 struct inet6_skb_parm h6; 617 } header; 618 619 union { 620 struct ip_tunnel *ip4; 621 struct ip6_tnl *ip6; 622 } tunnel; 623 }; 624 625 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0])) 626 627 /* 628 * This structure is used for the duration where packets are being 629 * transformed by IPsec. As soon as the packet leaves IPsec the 630 * area beyond the generic IP part may be overwritten. 631 */ 632 struct xfrm_skb_cb { 633 struct xfrm_tunnel_skb_cb header; 634 635 /* Sequence number for replay protection. */ 636 union { 637 struct { 638 __u32 low; 639 __u32 hi; 640 } output; 641 struct { 642 __be32 low; 643 __be32 hi; 644 } input; 645 } seq; 646 }; 647 648 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) 649 650 /* 651 * This structure is used by the afinfo prepare_input/prepare_output functions 652 * to transmit header information to the mode input/output functions. 653 */ 654 struct xfrm_mode_skb_cb { 655 struct xfrm_tunnel_skb_cb header; 656 657 /* Copied from header for IPv4, always set to zero and DF for IPv6. */ 658 __be16 id; 659 __be16 frag_off; 660 661 /* IP header length (excluding options or extension headers). */ 662 u8 ihl; 663 664 /* TOS for IPv4, class for IPv6. */ 665 u8 tos; 666 667 /* TTL for IPv4, hop limitfor IPv6. */ 668 u8 ttl; 669 670 /* Protocol for IPv4, NH for IPv6. */ 671 u8 protocol; 672 673 /* Option length for IPv4, zero for IPv6. */ 674 u8 optlen; 675 676 /* Used by IPv6 only, zero for IPv4. */ 677 u8 flow_lbl[3]; 678 }; 679 680 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0])) 681 682 /* 683 * This structure is used by the input processing to locate the SPI and 684 * related information. 685 */ 686 struct xfrm_spi_skb_cb { 687 struct xfrm_tunnel_skb_cb header; 688 689 unsigned int daddroff; 690 unsigned int family; 691 __be32 seq; 692 }; 693 694 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0])) 695 696 #ifdef CONFIG_AUDITSYSCALL 697 static inline struct audit_buffer *xfrm_audit_start(const char *op) 698 { 699 struct audit_buffer *audit_buf = NULL; 700 701 if (audit_enabled == AUDIT_OFF) 702 return NULL; 703 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC, 704 AUDIT_MAC_IPSEC_EVENT); 705 if (audit_buf == NULL) 706 return NULL; 707 audit_log_format(audit_buf, "op=%s", op); 708 return audit_buf; 709 } 710 711 static inline void xfrm_audit_helper_usrinfo(bool task_valid, 712 struct audit_buffer *audit_buf) 713 { 714 const unsigned int auid = from_kuid(&init_user_ns, task_valid ? 715 audit_get_loginuid(current) : 716 INVALID_UID); 717 const unsigned int ses = task_valid ? audit_get_sessionid(current) : 718 AUDIT_SID_UNSET; 719 720 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses); 721 audit_log_task_context(audit_buf); 722 } 723 724 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid); 725 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 726 bool task_valid); 727 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid); 728 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid); 729 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 730 struct sk_buff *skb); 731 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb, 732 __be32 net_seq); 733 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family); 734 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi, 735 __be32 net_seq); 736 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb, 737 u8 proto); 738 #else 739 740 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 741 bool task_valid) 742 { 743 } 744 745 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 746 bool task_valid) 747 { 748 } 749 750 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result, 751 bool task_valid) 752 { 753 } 754 755 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result, 756 bool task_valid) 757 { 758 } 759 760 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 761 struct sk_buff *skb) 762 { 763 } 764 765 static inline void xfrm_audit_state_replay(struct xfrm_state *x, 766 struct sk_buff *skb, __be32 net_seq) 767 { 768 } 769 770 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb, 771 u16 family) 772 { 773 } 774 775 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 776 __be32 net_spi, __be32 net_seq) 777 { 778 } 779 780 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x, 781 struct sk_buff *skb, u8 proto) 782 { 783 } 784 #endif /* CONFIG_AUDITSYSCALL */ 785 786 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 787 { 788 if (likely(policy != NULL)) 789 refcount_inc(&policy->refcnt); 790 } 791 792 void xfrm_policy_destroy(struct xfrm_policy *policy); 793 794 static inline void xfrm_pol_put(struct xfrm_policy *policy) 795 { 796 if (refcount_dec_and_test(&policy->refcnt)) 797 xfrm_policy_destroy(policy); 798 } 799 800 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 801 { 802 int i; 803 for (i = npols - 1; i >= 0; --i) 804 xfrm_pol_put(pols[i]); 805 } 806 807 void __xfrm_state_destroy(struct xfrm_state *, bool); 808 809 static inline void __xfrm_state_put(struct xfrm_state *x) 810 { 811 refcount_dec(&x->refcnt); 812 } 813 814 static inline void xfrm_state_put(struct xfrm_state *x) 815 { 816 if (refcount_dec_and_test(&x->refcnt)) 817 __xfrm_state_destroy(x, false); 818 } 819 820 static inline void xfrm_state_put_sync(struct xfrm_state *x) 821 { 822 if (refcount_dec_and_test(&x->refcnt)) 823 __xfrm_state_destroy(x, true); 824 } 825 826 static inline void xfrm_state_hold(struct xfrm_state *x) 827 { 828 refcount_inc(&x->refcnt); 829 } 830 831 static inline bool addr_match(const void *token1, const void *token2, 832 unsigned int prefixlen) 833 { 834 const __be32 *a1 = token1; 835 const __be32 *a2 = token2; 836 unsigned int pdw; 837 unsigned int pbi; 838 839 pdw = prefixlen >> 5; /* num of whole u32 in prefix */ 840 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 841 842 if (pdw) 843 if (memcmp(a1, a2, pdw << 2)) 844 return false; 845 846 if (pbi) { 847 __be32 mask; 848 849 mask = htonl((0xffffffff) << (32 - pbi)); 850 851 if ((a1[pdw] ^ a2[pdw]) & mask) 852 return false; 853 } 854 855 return true; 856 } 857 858 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen) 859 { 860 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */ 861 if (sizeof(long) == 4 && prefixlen == 0) 862 return true; 863 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen))); 864 } 865 866 static __inline__ 867 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli) 868 { 869 __be16 port; 870 switch(fl->flowi_proto) { 871 case IPPROTO_TCP: 872 case IPPROTO_UDP: 873 case IPPROTO_UDPLITE: 874 case IPPROTO_SCTP: 875 port = uli->ports.sport; 876 break; 877 case IPPROTO_ICMP: 878 case IPPROTO_ICMPV6: 879 port = htons(uli->icmpt.type); 880 break; 881 case IPPROTO_MH: 882 port = htons(uli->mht.type); 883 break; 884 case IPPROTO_GRE: 885 port = htons(ntohl(uli->gre_key) >> 16); 886 break; 887 default: 888 port = 0; /*XXX*/ 889 } 890 return port; 891 } 892 893 static __inline__ 894 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli) 895 { 896 __be16 port; 897 switch(fl->flowi_proto) { 898 case IPPROTO_TCP: 899 case IPPROTO_UDP: 900 case IPPROTO_UDPLITE: 901 case IPPROTO_SCTP: 902 port = uli->ports.dport; 903 break; 904 case IPPROTO_ICMP: 905 case IPPROTO_ICMPV6: 906 port = htons(uli->icmpt.code); 907 break; 908 case IPPROTO_GRE: 909 port = htons(ntohl(uli->gre_key) & 0xffff); 910 break; 911 default: 912 port = 0; /*XXX*/ 913 } 914 return port; 915 } 916 917 bool xfrm_selector_match(const struct xfrm_selector *sel, 918 const struct flowi *fl, unsigned short family); 919 920 #ifdef CONFIG_SECURITY_NETWORK_XFRM 921 /* If neither has a context --> match 922 * Otherwise, both must have a context and the sids, doi, alg must match 923 */ 924 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 925 { 926 return ((!s1 && !s2) || 927 (s1 && s2 && 928 (s1->ctx_sid == s2->ctx_sid) && 929 (s1->ctx_doi == s2->ctx_doi) && 930 (s1->ctx_alg == s2->ctx_alg))); 931 } 932 #else 933 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 934 { 935 return true; 936 } 937 #endif 938 939 /* A struct encoding bundle of transformations to apply to some set of flow. 940 * 941 * xdst->child points to the next element of bundle. 942 * dst->xfrm points to an instanse of transformer. 943 * 944 * Due to unfortunate limitations of current routing cache, which we 945 * have no time to fix, it mirrors struct rtable and bound to the same 946 * routing key, including saddr,daddr. However, we can have many of 947 * bundles differing by session id. All the bundles grow from a parent 948 * policy rule. 949 */ 950 struct xfrm_dst { 951 union { 952 struct dst_entry dst; 953 struct rtable rt; 954 struct rt6_info rt6; 955 } u; 956 struct dst_entry *route; 957 struct dst_entry *child; 958 struct dst_entry *path; 959 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; 960 int num_pols, num_xfrms; 961 u32 xfrm_genid; 962 u32 policy_genid; 963 u32 route_mtu_cached; 964 u32 child_mtu_cached; 965 u32 route_cookie; 966 u32 path_cookie; 967 }; 968 969 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst) 970 { 971 #ifdef CONFIG_XFRM 972 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) { 973 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst; 974 975 return xdst->path; 976 } 977 #endif 978 return (struct dst_entry *) dst; 979 } 980 981 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst) 982 { 983 #ifdef CONFIG_XFRM 984 if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) { 985 struct xfrm_dst *xdst = (struct xfrm_dst *) dst; 986 return xdst->child; 987 } 988 #endif 989 return NULL; 990 } 991 992 #ifdef CONFIG_XFRM 993 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child) 994 { 995 xdst->child = child; 996 } 997 998 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 999 { 1000 xfrm_pols_put(xdst->pols, xdst->num_pols); 1001 dst_release(xdst->route); 1002 if (likely(xdst->u.dst.xfrm)) 1003 xfrm_state_put(xdst->u.dst.xfrm); 1004 } 1005 #endif 1006 1007 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 1008 1009 struct xfrm_if_parms { 1010 int link; /* ifindex of underlying L2 interface */ 1011 u32 if_id; /* interface identifyer */ 1012 bool collect_md; 1013 }; 1014 1015 struct xfrm_if { 1016 struct xfrm_if __rcu *next; /* next interface in list */ 1017 struct net_device *dev; /* virtual device associated with interface */ 1018 struct net *net; /* netns for packet i/o */ 1019 struct xfrm_if_parms p; /* interface parms */ 1020 1021 struct gro_cells gro_cells; 1022 }; 1023 1024 struct xfrm_offload { 1025 /* Output sequence number for replay protection on offloading. */ 1026 struct { 1027 __u32 low; 1028 __u32 hi; 1029 } seq; 1030 1031 __u32 flags; 1032 #define SA_DELETE_REQ 1 1033 #define CRYPTO_DONE 2 1034 #define CRYPTO_NEXT_DONE 4 1035 #define CRYPTO_FALLBACK 8 1036 #define XFRM_GSO_SEGMENT 16 1037 #define XFRM_GRO 32 1038 /* 64 is free */ 1039 #define XFRM_DEV_RESUME 128 1040 #define XFRM_XMIT 256 1041 1042 __u32 status; 1043 #define CRYPTO_SUCCESS 1 1044 #define CRYPTO_GENERIC_ERROR 2 1045 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4 1046 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8 1047 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16 1048 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32 1049 #define CRYPTO_INVALID_PACKET_SYNTAX 64 1050 #define CRYPTO_INVALID_PROTOCOL 128 1051 1052 /* Used to keep whole l2 header for transport mode GRO */ 1053 __u32 orig_mac_len; 1054 1055 __u8 proto; 1056 __u8 inner_ipproto; 1057 }; 1058 1059 struct sec_path { 1060 int len; 1061 int olen; 1062 int verified_cnt; 1063 1064 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 1065 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH]; 1066 }; 1067 1068 struct sec_path *secpath_set(struct sk_buff *skb); 1069 1070 static inline void 1071 secpath_reset(struct sk_buff *skb) 1072 { 1073 #ifdef CONFIG_XFRM 1074 skb_ext_del(skb, SKB_EXT_SEC_PATH); 1075 #endif 1076 } 1077 1078 static inline int 1079 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family) 1080 { 1081 switch (family) { 1082 case AF_INET: 1083 return addr->a4 == 0; 1084 case AF_INET6: 1085 return ipv6_addr_any(&addr->in6); 1086 } 1087 return 0; 1088 } 1089 1090 static inline int 1091 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1092 { 1093 return (tmpl->saddr.a4 && 1094 tmpl->saddr.a4 != x->props.saddr.a4); 1095 } 1096 1097 static inline int 1098 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1099 { 1100 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 1101 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 1102 } 1103 1104 static inline int 1105 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family) 1106 { 1107 switch (family) { 1108 case AF_INET: 1109 return __xfrm4_state_addr_cmp(tmpl, x); 1110 case AF_INET6: 1111 return __xfrm6_state_addr_cmp(tmpl, x); 1112 } 1113 return !0; 1114 } 1115 1116 #ifdef CONFIG_XFRM 1117 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) 1118 { 1119 struct sec_path *sp = skb_sec_path(skb); 1120 1121 return sp->xvec[sp->len - 1]; 1122 } 1123 #endif 1124 1125 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb) 1126 { 1127 #ifdef CONFIG_XFRM 1128 struct sec_path *sp = skb_sec_path(skb); 1129 1130 if (!sp || !sp->olen || sp->len != sp->olen) 1131 return NULL; 1132 1133 return &sp->ovec[sp->olen - 1]; 1134 #else 1135 return NULL; 1136 #endif 1137 } 1138 1139 #ifdef CONFIG_XFRM 1140 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, 1141 unsigned short family); 1142 1143 static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb, 1144 int dir) 1145 { 1146 if (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) 1147 return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT; 1148 1149 return false; 1150 } 1151 1152 static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb, 1153 int dir, unsigned short family) 1154 { 1155 if (dir != XFRM_POLICY_OUT && family == AF_INET) { 1156 /* same dst may be used for traffic originating from 1157 * devices with different policy settings. 1158 */ 1159 return IPCB(skb)->flags & IPSKB_NOPOLICY; 1160 } 1161 return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY); 1162 } 1163 1164 static inline int __xfrm_policy_check2(struct sock *sk, int dir, 1165 struct sk_buff *skb, 1166 unsigned int family, int reverse) 1167 { 1168 struct net *net = dev_net(skb->dev); 1169 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); 1170 struct xfrm_offload *xo = xfrm_offload(skb); 1171 struct xfrm_state *x; 1172 1173 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 1174 return __xfrm_policy_check(sk, ndir, skb, family); 1175 1176 if (xo) { 1177 x = xfrm_input_state(skb); 1178 if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET) 1179 return (xo->flags & CRYPTO_DONE) && 1180 (xo->status & CRYPTO_SUCCESS); 1181 } 1182 1183 return __xfrm_check_nopolicy(net, skb, dir) || 1184 __xfrm_check_dev_nopolicy(skb, dir, family) || 1185 __xfrm_policy_check(sk, ndir, skb, family); 1186 } 1187 1188 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1189 { 1190 return __xfrm_policy_check2(sk, dir, skb, family, 0); 1191 } 1192 1193 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1194 { 1195 return xfrm_policy_check(sk, dir, skb, AF_INET); 1196 } 1197 1198 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1199 { 1200 return xfrm_policy_check(sk, dir, skb, AF_INET6); 1201 } 1202 1203 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1204 struct sk_buff *skb) 1205 { 1206 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); 1207 } 1208 1209 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1210 struct sk_buff *skb) 1211 { 1212 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); 1213 } 1214 1215 int __xfrm_decode_session(struct net *net, struct sk_buff *skb, struct flowi *fl, 1216 unsigned int family, int reverse); 1217 1218 static inline int xfrm_decode_session(struct net *net, struct sk_buff *skb, struct flowi *fl, 1219 unsigned int family) 1220 { 1221 return __xfrm_decode_session(net, skb, fl, family, 0); 1222 } 1223 1224 static inline int xfrm_decode_session_reverse(struct net *net, struct sk_buff *skb, 1225 struct flowi *fl, 1226 unsigned int family) 1227 { 1228 return __xfrm_decode_session(net, skb, fl, family, 1); 1229 } 1230 1231 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 1232 1233 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 1234 { 1235 struct net *net = dev_net(skb->dev); 1236 1237 if (!net->xfrm.policy_count[XFRM_POLICY_OUT] && 1238 net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT) 1239 return true; 1240 1241 return (skb_dst(skb)->flags & DST_NOXFRM) || 1242 __xfrm_route_forward(skb, family); 1243 } 1244 1245 static inline int xfrm4_route_forward(struct sk_buff *skb) 1246 { 1247 return xfrm_route_forward(skb, AF_INET); 1248 } 1249 1250 static inline int xfrm6_route_forward(struct sk_buff *skb) 1251 { 1252 return xfrm_route_forward(skb, AF_INET6); 1253 } 1254 1255 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk); 1256 1257 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) 1258 { 1259 if (!sk_fullsock(osk)) 1260 return 0; 1261 sk->sk_policy[0] = NULL; 1262 sk->sk_policy[1] = NULL; 1263 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1])) 1264 return __xfrm_sk_clone_policy(sk, osk); 1265 return 0; 1266 } 1267 1268 int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 1269 1270 static inline void xfrm_sk_free_policy(struct sock *sk) 1271 { 1272 struct xfrm_policy *pol; 1273 1274 pol = rcu_dereference_protected(sk->sk_policy[0], 1); 1275 if (unlikely(pol != NULL)) { 1276 xfrm_policy_delete(pol, XFRM_POLICY_MAX); 1277 sk->sk_policy[0] = NULL; 1278 } 1279 pol = rcu_dereference_protected(sk->sk_policy[1], 1); 1280 if (unlikely(pol != NULL)) { 1281 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1); 1282 sk->sk_policy[1] = NULL; 1283 } 1284 } 1285 1286 #else 1287 1288 static inline void xfrm_sk_free_policy(struct sock *sk) {} 1289 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; } 1290 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 1291 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 1292 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1293 { 1294 return 1; 1295 } 1296 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1297 { 1298 return 1; 1299 } 1300 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1301 { 1302 return 1; 1303 } 1304 static inline int xfrm_decode_session_reverse(struct net *net, struct sk_buff *skb, 1305 struct flowi *fl, 1306 unsigned int family) 1307 { 1308 return -ENOSYS; 1309 } 1310 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1311 struct sk_buff *skb) 1312 { 1313 return 1; 1314 } 1315 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1316 struct sk_buff *skb) 1317 { 1318 return 1; 1319 } 1320 #endif 1321 1322 static __inline__ 1323 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family) 1324 { 1325 switch (family){ 1326 case AF_INET: 1327 return (xfrm_address_t *)&fl->u.ip4.daddr; 1328 case AF_INET6: 1329 return (xfrm_address_t *)&fl->u.ip6.daddr; 1330 } 1331 return NULL; 1332 } 1333 1334 static __inline__ 1335 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family) 1336 { 1337 switch (family){ 1338 case AF_INET: 1339 return (xfrm_address_t *)&fl->u.ip4.saddr; 1340 case AF_INET6: 1341 return (xfrm_address_t *)&fl->u.ip6.saddr; 1342 } 1343 return NULL; 1344 } 1345 1346 static __inline__ 1347 void xfrm_flowi_addr_get(const struct flowi *fl, 1348 xfrm_address_t *saddr, xfrm_address_t *daddr, 1349 unsigned short family) 1350 { 1351 switch(family) { 1352 case AF_INET: 1353 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4)); 1354 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4)); 1355 break; 1356 case AF_INET6: 1357 saddr->in6 = fl->u.ip6.saddr; 1358 daddr->in6 = fl->u.ip6.daddr; 1359 break; 1360 } 1361 } 1362 1363 static __inline__ int 1364 __xfrm4_state_addr_check(const struct xfrm_state *x, 1365 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1366 { 1367 if (daddr->a4 == x->id.daddr.a4 && 1368 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 1369 return 1; 1370 return 0; 1371 } 1372 1373 static __inline__ int 1374 __xfrm6_state_addr_check(const struct xfrm_state *x, 1375 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1376 { 1377 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 1378 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) || 1379 ipv6_addr_any((struct in6_addr *)saddr) || 1380 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 1381 return 1; 1382 return 0; 1383 } 1384 1385 static __inline__ int 1386 xfrm_state_addr_check(const struct xfrm_state *x, 1387 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1388 unsigned short family) 1389 { 1390 switch (family) { 1391 case AF_INET: 1392 return __xfrm4_state_addr_check(x, daddr, saddr); 1393 case AF_INET6: 1394 return __xfrm6_state_addr_check(x, daddr, saddr); 1395 } 1396 return 0; 1397 } 1398 1399 static __inline__ int 1400 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl, 1401 unsigned short family) 1402 { 1403 switch (family) { 1404 case AF_INET: 1405 return __xfrm4_state_addr_check(x, 1406 (const xfrm_address_t *)&fl->u.ip4.daddr, 1407 (const xfrm_address_t *)&fl->u.ip4.saddr); 1408 case AF_INET6: 1409 return __xfrm6_state_addr_check(x, 1410 (const xfrm_address_t *)&fl->u.ip6.daddr, 1411 (const xfrm_address_t *)&fl->u.ip6.saddr); 1412 } 1413 return 0; 1414 } 1415 1416 static inline int xfrm_state_kern(const struct xfrm_state *x) 1417 { 1418 return atomic_read(&x->tunnel_users); 1419 } 1420 1421 static inline bool xfrm_id_proto_valid(u8 proto) 1422 { 1423 switch (proto) { 1424 case IPPROTO_AH: 1425 case IPPROTO_ESP: 1426 case IPPROTO_COMP: 1427 #if IS_ENABLED(CONFIG_IPV6) 1428 case IPPROTO_ROUTING: 1429 case IPPROTO_DSTOPTS: 1430 #endif 1431 return true; 1432 default: 1433 return false; 1434 } 1435 } 1436 1437 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */ 1438 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 1439 { 1440 return (!userproto || proto == userproto || 1441 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 1442 proto == IPPROTO_ESP || 1443 proto == IPPROTO_COMP))); 1444 } 1445 1446 /* 1447 * xfrm algorithm information 1448 */ 1449 struct xfrm_algo_aead_info { 1450 char *geniv; 1451 u16 icv_truncbits; 1452 }; 1453 1454 struct xfrm_algo_auth_info { 1455 u16 icv_truncbits; 1456 u16 icv_fullbits; 1457 }; 1458 1459 struct xfrm_algo_encr_info { 1460 char *geniv; 1461 u16 blockbits; 1462 u16 defkeybits; 1463 }; 1464 1465 struct xfrm_algo_comp_info { 1466 u16 threshold; 1467 }; 1468 1469 struct xfrm_algo_desc { 1470 char *name; 1471 char *compat; 1472 u8 available:1; 1473 u8 pfkey_supported:1; 1474 union { 1475 struct xfrm_algo_aead_info aead; 1476 struct xfrm_algo_auth_info auth; 1477 struct xfrm_algo_encr_info encr; 1478 struct xfrm_algo_comp_info comp; 1479 } uinfo; 1480 struct sadb_alg desc; 1481 }; 1482 1483 /* XFRM protocol handlers. */ 1484 struct xfrm4_protocol { 1485 int (*handler)(struct sk_buff *skb); 1486 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1487 int encap_type); 1488 int (*cb_handler)(struct sk_buff *skb, int err); 1489 int (*err_handler)(struct sk_buff *skb, u32 info); 1490 1491 struct xfrm4_protocol __rcu *next; 1492 int priority; 1493 }; 1494 1495 struct xfrm6_protocol { 1496 int (*handler)(struct sk_buff *skb); 1497 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1498 int encap_type); 1499 int (*cb_handler)(struct sk_buff *skb, int err); 1500 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1501 u8 type, u8 code, int offset, __be32 info); 1502 1503 struct xfrm6_protocol __rcu *next; 1504 int priority; 1505 }; 1506 1507 /* XFRM tunnel handlers. */ 1508 struct xfrm_tunnel { 1509 int (*handler)(struct sk_buff *skb); 1510 int (*cb_handler)(struct sk_buff *skb, int err); 1511 int (*err_handler)(struct sk_buff *skb, u32 info); 1512 1513 struct xfrm_tunnel __rcu *next; 1514 int priority; 1515 }; 1516 1517 struct xfrm6_tunnel { 1518 int (*handler)(struct sk_buff *skb); 1519 int (*cb_handler)(struct sk_buff *skb, int err); 1520 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1521 u8 type, u8 code, int offset, __be32 info); 1522 struct xfrm6_tunnel __rcu *next; 1523 int priority; 1524 }; 1525 1526 void xfrm_init(void); 1527 void xfrm4_init(void); 1528 int xfrm_state_init(struct net *net); 1529 void xfrm_state_fini(struct net *net); 1530 void xfrm4_state_init(void); 1531 void xfrm4_protocol_init(void); 1532 #ifdef CONFIG_XFRM 1533 int xfrm6_init(void); 1534 void xfrm6_fini(void); 1535 int xfrm6_state_init(void); 1536 void xfrm6_state_fini(void); 1537 int xfrm6_protocol_init(void); 1538 void xfrm6_protocol_fini(void); 1539 #else 1540 static inline int xfrm6_init(void) 1541 { 1542 return 0; 1543 } 1544 static inline void xfrm6_fini(void) 1545 { 1546 ; 1547 } 1548 #endif 1549 1550 #ifdef CONFIG_XFRM_STATISTICS 1551 int xfrm_proc_init(struct net *net); 1552 void xfrm_proc_fini(struct net *net); 1553 #endif 1554 1555 int xfrm_sysctl_init(struct net *net); 1556 #ifdef CONFIG_SYSCTL 1557 void xfrm_sysctl_fini(struct net *net); 1558 #else 1559 static inline void xfrm_sysctl_fini(struct net *net) 1560 { 1561 } 1562 #endif 1563 1564 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 1565 struct xfrm_address_filter *filter); 1566 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1567 int (*func)(struct xfrm_state *, int, void*), void *); 1568 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net); 1569 struct xfrm_state *xfrm_state_alloc(struct net *net); 1570 void xfrm_state_free(struct xfrm_state *x); 1571 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr, 1572 const xfrm_address_t *saddr, 1573 const struct flowi *fl, 1574 struct xfrm_tmpl *tmpl, 1575 struct xfrm_policy *pol, int *err, 1576 unsigned short family, u32 if_id); 1577 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id, 1578 xfrm_address_t *daddr, 1579 xfrm_address_t *saddr, 1580 unsigned short family, 1581 u8 mode, u8 proto, u32 reqid); 1582 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1583 unsigned short family); 1584 int xfrm_state_check_expire(struct xfrm_state *x); 1585 void xfrm_state_update_stats(struct net *net); 1586 #ifdef CONFIG_XFRM_OFFLOAD 1587 static inline void xfrm_dev_state_update_stats(struct xfrm_state *x) 1588 { 1589 struct xfrm_dev_offload *xdo = &x->xso; 1590 struct net_device *dev = xdo->dev; 1591 1592 if (dev && dev->xfrmdev_ops && 1593 dev->xfrmdev_ops->xdo_dev_state_update_stats) 1594 dev->xfrmdev_ops->xdo_dev_state_update_stats(x); 1595 1596 } 1597 #else 1598 static inline void xfrm_dev_state_update_stats(struct xfrm_state *x) {} 1599 #endif 1600 void xfrm_state_insert(struct xfrm_state *x); 1601 int xfrm_state_add(struct xfrm_state *x); 1602 int xfrm_state_update(struct xfrm_state *x); 1603 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark, 1604 const xfrm_address_t *daddr, __be32 spi, 1605 u8 proto, unsigned short family); 1606 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1607 const xfrm_address_t *daddr, 1608 const xfrm_address_t *saddr, 1609 u8 proto, 1610 unsigned short family); 1611 #ifdef CONFIG_XFRM_SUB_POLICY 1612 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1613 unsigned short family); 1614 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1615 unsigned short family); 1616 #else 1617 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s, 1618 int n, unsigned short family) 1619 { 1620 } 1621 1622 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s, 1623 int n, unsigned short family) 1624 { 1625 } 1626 #endif 1627 1628 struct xfrmk_sadinfo { 1629 u32 sadhcnt; /* current hash bkts */ 1630 u32 sadhmcnt; /* max allowed hash bkts */ 1631 u32 sadcnt; /* current running count */ 1632 }; 1633 1634 struct xfrmk_spdinfo { 1635 u32 incnt; 1636 u32 outcnt; 1637 u32 fwdcnt; 1638 u32 inscnt; 1639 u32 outscnt; 1640 u32 fwdscnt; 1641 u32 spdhcnt; 1642 u32 spdhmcnt; 1643 }; 1644 1645 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1646 int xfrm_state_delete(struct xfrm_state *x); 1647 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync); 1648 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid); 1649 int xfrm_dev_policy_flush(struct net *net, struct net_device *dev, 1650 bool task_valid); 1651 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); 1652 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); 1653 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq); 1654 int xfrm_init_replay(struct xfrm_state *x, struct netlink_ext_ack *extack); 1655 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu); 1656 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload, 1657 struct netlink_ext_ack *extack); 1658 int xfrm_init_state(struct xfrm_state *x); 1659 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type); 1660 int xfrm_input_resume(struct sk_buff *skb, int nexthdr); 1661 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb, 1662 int (*finish)(struct net *, struct sock *, 1663 struct sk_buff *)); 1664 int xfrm_trans_queue(struct sk_buff *skb, 1665 int (*finish)(struct net *, struct sock *, 1666 struct sk_buff *)); 1667 int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err); 1668 int xfrm_output(struct sock *sk, struct sk_buff *skb); 1669 1670 #if IS_ENABLED(CONFIG_NET_PKTGEN) 1671 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb); 1672 #endif 1673 1674 void xfrm_local_error(struct sk_buff *skb, int mtu); 1675 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1676 int encap_type); 1677 int xfrm4_transport_finish(struct sk_buff *skb, int async); 1678 int xfrm4_rcv(struct sk_buff *skb); 1679 1680 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1681 { 1682 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL; 1683 XFRM_SPI_SKB_CB(skb)->family = AF_INET; 1684 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); 1685 return xfrm_input(skb, nexthdr, spi, 0); 1686 } 1687 1688 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1689 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol); 1690 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol); 1691 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1692 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1693 void xfrm4_local_error(struct sk_buff *skb, u32 mtu); 1694 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi, 1695 struct ip6_tnl *t); 1696 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1697 int encap_type); 1698 int xfrm6_transport_finish(struct sk_buff *skb, int async); 1699 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t); 1700 int xfrm6_rcv(struct sk_buff *skb); 1701 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1702 xfrm_address_t *saddr, u8 proto); 1703 void xfrm6_local_error(struct sk_buff *skb, u32 mtu); 1704 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol); 1705 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol); 1706 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1707 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1708 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr); 1709 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr); 1710 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1711 1712 #ifdef CONFIG_XFRM 1713 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu); 1714 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1715 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1716 struct sk_buff *xfrm4_gro_udp_encap_rcv(struct sock *sk, struct list_head *head, 1717 struct sk_buff *skb); 1718 struct sk_buff *xfrm6_gro_udp_encap_rcv(struct sock *sk, struct list_head *head, 1719 struct sk_buff *skb); 1720 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, 1721 int optlen); 1722 #else 1723 static inline int xfrm_user_policy(struct sock *sk, int optname, 1724 sockptr_t optval, int optlen) 1725 { 1726 return -ENOPROTOOPT; 1727 } 1728 #endif 1729 1730 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif, 1731 const xfrm_address_t *saddr, 1732 const xfrm_address_t *daddr, 1733 int family, u32 mark); 1734 1735 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); 1736 1737 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); 1738 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, 1739 int (*func)(struct xfrm_policy *, int, int, void*), 1740 void *); 1741 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net); 1742 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1743 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, 1744 const struct xfrm_mark *mark, 1745 u32 if_id, u8 type, int dir, 1746 struct xfrm_selector *sel, 1747 struct xfrm_sec_ctx *ctx, int delete, 1748 int *err); 1749 struct xfrm_policy *xfrm_policy_byid(struct net *net, 1750 const struct xfrm_mark *mark, u32 if_id, 1751 u8 type, int dir, u32 id, int delete, 1752 int *err); 1753 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid); 1754 void xfrm_policy_hash_rebuild(struct net *net); 1755 u32 xfrm_get_acqseq(void); 1756 int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack); 1757 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi, 1758 struct netlink_ext_ack *extack); 1759 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, 1760 u8 mode, u32 reqid, u32 if_id, u8 proto, 1761 const xfrm_address_t *daddr, 1762 const xfrm_address_t *saddr, int create, 1763 unsigned short family); 1764 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1765 1766 #ifdef CONFIG_XFRM_MIGRATE 1767 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1768 const struct xfrm_migrate *m, int num_bundles, 1769 const struct xfrm_kmaddress *k, 1770 const struct xfrm_encap_tmpl *encap); 1771 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net, 1772 u32 if_id); 1773 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 1774 struct xfrm_migrate *m, 1775 struct xfrm_encap_tmpl *encap); 1776 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1777 struct xfrm_migrate *m, int num_bundles, 1778 struct xfrm_kmaddress *k, struct net *net, 1779 struct xfrm_encap_tmpl *encap, u32 if_id, 1780 struct netlink_ext_ack *extack); 1781 #endif 1782 1783 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1784 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid); 1785 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, 1786 xfrm_address_t *addr); 1787 1788 void xfrm_input_init(void); 1789 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1790 1791 void xfrm_probe_algs(void); 1792 int xfrm_count_pfkey_auth_supported(void); 1793 int xfrm_count_pfkey_enc_supported(void); 1794 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1795 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1796 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1797 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1798 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1799 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe); 1800 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe); 1801 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe); 1802 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, 1803 int probe); 1804 1805 static inline bool xfrm6_addr_equal(const xfrm_address_t *a, 1806 const xfrm_address_t *b) 1807 { 1808 return ipv6_addr_equal((const struct in6_addr *)a, 1809 (const struct in6_addr *)b); 1810 } 1811 1812 static inline bool xfrm_addr_equal(const xfrm_address_t *a, 1813 const xfrm_address_t *b, 1814 sa_family_t family) 1815 { 1816 switch (family) { 1817 default: 1818 case AF_INET: 1819 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0; 1820 case AF_INET6: 1821 return xfrm6_addr_equal(a, b); 1822 } 1823 } 1824 1825 static inline int xfrm_policy_id2dir(u32 index) 1826 { 1827 return index & 7; 1828 } 1829 1830 #ifdef CONFIG_XFRM 1831 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq); 1832 int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq); 1833 void xfrm_replay_notify(struct xfrm_state *x, int event); 1834 int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb); 1835 int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq); 1836 1837 static inline int xfrm_aevent_is_on(struct net *net) 1838 { 1839 struct sock *nlsk; 1840 int ret = 0; 1841 1842 rcu_read_lock(); 1843 nlsk = rcu_dereference(net->xfrm.nlsk); 1844 if (nlsk) 1845 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1846 rcu_read_unlock(); 1847 return ret; 1848 } 1849 1850 static inline int xfrm_acquire_is_on(struct net *net) 1851 { 1852 struct sock *nlsk; 1853 int ret = 0; 1854 1855 rcu_read_lock(); 1856 nlsk = rcu_dereference(net->xfrm.nlsk); 1857 if (nlsk) 1858 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE); 1859 rcu_read_unlock(); 1860 1861 return ret; 1862 } 1863 #endif 1864 1865 static inline unsigned int aead_len(struct xfrm_algo_aead *alg) 1866 { 1867 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1868 } 1869 1870 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg) 1871 { 1872 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1873 } 1874 1875 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg) 1876 { 1877 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1878 } 1879 1880 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn) 1881 { 1882 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32); 1883 } 1884 1885 #ifdef CONFIG_XFRM_MIGRATE 1886 static inline int xfrm_replay_clone(struct xfrm_state *x, 1887 struct xfrm_state *orig) 1888 { 1889 1890 x->replay_esn = kmemdup(orig->replay_esn, 1891 xfrm_replay_state_esn_len(orig->replay_esn), 1892 GFP_KERNEL); 1893 if (!x->replay_esn) 1894 return -ENOMEM; 1895 x->preplay_esn = kmemdup(orig->preplay_esn, 1896 xfrm_replay_state_esn_len(orig->preplay_esn), 1897 GFP_KERNEL); 1898 if (!x->preplay_esn) 1899 return -ENOMEM; 1900 1901 return 0; 1902 } 1903 1904 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig) 1905 { 1906 return kmemdup(orig, aead_len(orig), GFP_KERNEL); 1907 } 1908 1909 1910 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1911 { 1912 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); 1913 } 1914 1915 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig) 1916 { 1917 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL); 1918 } 1919 1920 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1921 { 1922 int i; 1923 for (i = 0; i < n; i++) 1924 xfrm_state_put(*(states + i)); 1925 } 1926 1927 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1928 { 1929 int i; 1930 for (i = 0; i < n; i++) 1931 xfrm_state_delete(*(states + i)); 1932 } 1933 #endif 1934 1935 void __init xfrm_dev_init(void); 1936 1937 #ifdef CONFIG_XFRM_OFFLOAD 1938 void xfrm_dev_resume(struct sk_buff *skb); 1939 void xfrm_dev_backlog(struct softnet_data *sd); 1940 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again); 1941 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, 1942 struct xfrm_user_offload *xuo, 1943 struct netlink_ext_ack *extack); 1944 int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp, 1945 struct xfrm_user_offload *xuo, u8 dir, 1946 struct netlink_ext_ack *extack); 1947 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x); 1948 1949 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 1950 { 1951 struct xfrm_dev_offload *xso = &x->xso; 1952 1953 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn) 1954 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x); 1955 } 1956 1957 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 1958 { 1959 struct xfrm_state *x = dst->xfrm; 1960 struct xfrm_dst *xdst; 1961 1962 if (!x || !x->type_offload) 1963 return false; 1964 1965 xdst = (struct xfrm_dst *) dst; 1966 if (!x->xso.offload_handle && !xdst->child->xfrm) 1967 return true; 1968 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) && 1969 !xdst->child->xfrm) 1970 return true; 1971 1972 return false; 1973 } 1974 1975 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 1976 { 1977 struct xfrm_dev_offload *xso = &x->xso; 1978 1979 if (xso->dev) 1980 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x); 1981 } 1982 1983 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1984 { 1985 struct xfrm_dev_offload *xso = &x->xso; 1986 struct net_device *dev = xso->dev; 1987 1988 if (dev && dev->xfrmdev_ops) { 1989 if (dev->xfrmdev_ops->xdo_dev_state_free) 1990 dev->xfrmdev_ops->xdo_dev_state_free(x); 1991 xso->dev = NULL; 1992 xso->type = XFRM_DEV_OFFLOAD_UNSPECIFIED; 1993 netdev_put(dev, &xso->dev_tracker); 1994 } 1995 } 1996 1997 static inline void xfrm_dev_policy_delete(struct xfrm_policy *x) 1998 { 1999 struct xfrm_dev_offload *xdo = &x->xdo; 2000 struct net_device *dev = xdo->dev; 2001 2002 if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_policy_delete) 2003 dev->xfrmdev_ops->xdo_dev_policy_delete(x); 2004 } 2005 2006 static inline void xfrm_dev_policy_free(struct xfrm_policy *x) 2007 { 2008 struct xfrm_dev_offload *xdo = &x->xdo; 2009 struct net_device *dev = xdo->dev; 2010 2011 if (dev && dev->xfrmdev_ops) { 2012 if (dev->xfrmdev_ops->xdo_dev_policy_free) 2013 dev->xfrmdev_ops->xdo_dev_policy_free(x); 2014 xdo->dev = NULL; 2015 netdev_put(dev, &xdo->dev_tracker); 2016 } 2017 } 2018 #else 2019 static inline void xfrm_dev_resume(struct sk_buff *skb) 2020 { 2021 } 2022 2023 static inline void xfrm_dev_backlog(struct softnet_data *sd) 2024 { 2025 } 2026 2027 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again) 2028 { 2029 return skb; 2030 } 2031 2032 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo, struct netlink_ext_ack *extack) 2033 { 2034 return 0; 2035 } 2036 2037 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 2038 { 2039 } 2040 2041 static inline void xfrm_dev_state_free(struct xfrm_state *x) 2042 { 2043 } 2044 2045 static inline int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp, 2046 struct xfrm_user_offload *xuo, u8 dir, 2047 struct netlink_ext_ack *extack) 2048 { 2049 return 0; 2050 } 2051 2052 static inline void xfrm_dev_policy_delete(struct xfrm_policy *x) 2053 { 2054 } 2055 2056 static inline void xfrm_dev_policy_free(struct xfrm_policy *x) 2057 { 2058 } 2059 2060 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) 2061 { 2062 return false; 2063 } 2064 2065 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 2066 { 2067 } 2068 2069 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 2070 { 2071 return false; 2072 } 2073 #endif 2074 2075 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) 2076 { 2077 if (attrs[XFRMA_MARK]) 2078 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark)); 2079 else 2080 m->v = m->m = 0; 2081 2082 return m->v & m->m; 2083 } 2084 2085 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m) 2086 { 2087 int ret = 0; 2088 2089 if (m->m | m->v) 2090 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); 2091 return ret; 2092 } 2093 2094 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x) 2095 { 2096 struct xfrm_mark *m = &x->props.smark; 2097 2098 return (m->v & m->m) | (mark & ~m->m); 2099 } 2100 2101 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id) 2102 { 2103 int ret = 0; 2104 2105 if (if_id) 2106 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id); 2107 return ret; 2108 } 2109 2110 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x, 2111 unsigned int family) 2112 { 2113 bool tunnel = false; 2114 2115 switch(family) { 2116 case AF_INET: 2117 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) 2118 tunnel = true; 2119 break; 2120 case AF_INET6: 2121 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) 2122 tunnel = true; 2123 break; 2124 } 2125 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL)) 2126 return -EINVAL; 2127 2128 return 0; 2129 } 2130 2131 extern const int xfrm_msg_min[XFRM_NR_MSGTYPES]; 2132 extern const struct nla_policy xfrma_policy[XFRMA_MAX+1]; 2133 2134 struct xfrm_translator { 2135 /* Allocate frag_list and put compat translation there */ 2136 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src); 2137 2138 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */ 2139 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh, 2140 int maxtype, const struct nla_policy *policy, 2141 struct netlink_ext_ack *extack); 2142 2143 /* Translate 32-bit user_policy from sockptr */ 2144 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen); 2145 2146 struct module *owner; 2147 }; 2148 2149 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT) 2150 extern int xfrm_register_translator(struct xfrm_translator *xtr); 2151 extern int xfrm_unregister_translator(struct xfrm_translator *xtr); 2152 extern struct xfrm_translator *xfrm_get_translator(void); 2153 extern void xfrm_put_translator(struct xfrm_translator *xtr); 2154 #else 2155 static inline struct xfrm_translator *xfrm_get_translator(void) 2156 { 2157 return NULL; 2158 } 2159 static inline void xfrm_put_translator(struct xfrm_translator *xtr) 2160 { 2161 } 2162 #endif 2163 2164 #if IS_ENABLED(CONFIG_IPV6) 2165 static inline bool xfrm6_local_dontfrag(const struct sock *sk) 2166 { 2167 int proto; 2168 2169 if (!sk || sk->sk_family != AF_INET6) 2170 return false; 2171 2172 proto = sk->sk_protocol; 2173 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW) 2174 return inet6_test_bit(DONTFRAG, sk); 2175 2176 return false; 2177 } 2178 #endif 2179 2180 #if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \ 2181 (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES)) 2182 2183 extern struct metadata_dst __percpu *xfrm_bpf_md_dst; 2184 2185 int register_xfrm_interface_bpf(void); 2186 2187 #else 2188 2189 static inline int register_xfrm_interface_bpf(void) 2190 { 2191 return 0; 2192 } 2193 2194 #endif 2195 2196 #if IS_ENABLED(CONFIG_DEBUG_INFO_BTF) 2197 int register_xfrm_state_bpf(void); 2198 #else 2199 static inline int register_xfrm_state_bpf(void) 2200 { 2201 return 0; 2202 } 2203 #endif 2204 2205 #endif /* _NET_XFRM_H */ 2206