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 __u8 proto; 1053 __u8 inner_ipproto; 1054 }; 1055 1056 struct sec_path { 1057 int len; 1058 int olen; 1059 int verified_cnt; 1060 1061 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 1062 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH]; 1063 }; 1064 1065 struct sec_path *secpath_set(struct sk_buff *skb); 1066 1067 static inline void 1068 secpath_reset(struct sk_buff *skb) 1069 { 1070 #ifdef CONFIG_XFRM 1071 skb_ext_del(skb, SKB_EXT_SEC_PATH); 1072 #endif 1073 } 1074 1075 static inline int 1076 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family) 1077 { 1078 switch (family) { 1079 case AF_INET: 1080 return addr->a4 == 0; 1081 case AF_INET6: 1082 return ipv6_addr_any(&addr->in6); 1083 } 1084 return 0; 1085 } 1086 1087 static inline int 1088 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1089 { 1090 return (tmpl->saddr.a4 && 1091 tmpl->saddr.a4 != x->props.saddr.a4); 1092 } 1093 1094 static inline int 1095 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1096 { 1097 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 1098 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 1099 } 1100 1101 static inline int 1102 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family) 1103 { 1104 switch (family) { 1105 case AF_INET: 1106 return __xfrm4_state_addr_cmp(tmpl, x); 1107 case AF_INET6: 1108 return __xfrm6_state_addr_cmp(tmpl, x); 1109 } 1110 return !0; 1111 } 1112 1113 #ifdef CONFIG_XFRM 1114 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) 1115 { 1116 struct sec_path *sp = skb_sec_path(skb); 1117 1118 return sp->xvec[sp->len - 1]; 1119 } 1120 #endif 1121 1122 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb) 1123 { 1124 #ifdef CONFIG_XFRM 1125 struct sec_path *sp = skb_sec_path(skb); 1126 1127 if (!sp || !sp->olen || sp->len != sp->olen) 1128 return NULL; 1129 1130 return &sp->ovec[sp->olen - 1]; 1131 #else 1132 return NULL; 1133 #endif 1134 } 1135 1136 #ifdef CONFIG_XFRM 1137 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, 1138 unsigned short family); 1139 1140 static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb, 1141 int dir) 1142 { 1143 if (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) 1144 return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT; 1145 1146 return false; 1147 } 1148 1149 static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb, 1150 int dir, unsigned short family) 1151 { 1152 if (dir != XFRM_POLICY_OUT && family == AF_INET) { 1153 /* same dst may be used for traffic originating from 1154 * devices with different policy settings. 1155 */ 1156 return IPCB(skb)->flags & IPSKB_NOPOLICY; 1157 } 1158 return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY); 1159 } 1160 1161 static inline int __xfrm_policy_check2(struct sock *sk, int dir, 1162 struct sk_buff *skb, 1163 unsigned int family, int reverse) 1164 { 1165 struct net *net = dev_net(skb->dev); 1166 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); 1167 struct xfrm_offload *xo = xfrm_offload(skb); 1168 struct xfrm_state *x; 1169 1170 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 1171 return __xfrm_policy_check(sk, ndir, skb, family); 1172 1173 if (xo) { 1174 x = xfrm_input_state(skb); 1175 if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET) 1176 return (xo->flags & CRYPTO_DONE) && 1177 (xo->status & CRYPTO_SUCCESS); 1178 } 1179 1180 return __xfrm_check_nopolicy(net, skb, dir) || 1181 __xfrm_check_dev_nopolicy(skb, dir, family) || 1182 __xfrm_policy_check(sk, ndir, skb, family); 1183 } 1184 1185 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1186 { 1187 return __xfrm_policy_check2(sk, dir, skb, family, 0); 1188 } 1189 1190 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1191 { 1192 return xfrm_policy_check(sk, dir, skb, AF_INET); 1193 } 1194 1195 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1196 { 1197 return xfrm_policy_check(sk, dir, skb, AF_INET6); 1198 } 1199 1200 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1201 struct sk_buff *skb) 1202 { 1203 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); 1204 } 1205 1206 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1207 struct sk_buff *skb) 1208 { 1209 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); 1210 } 1211 1212 int __xfrm_decode_session(struct net *net, struct sk_buff *skb, struct flowi *fl, 1213 unsigned int family, int reverse); 1214 1215 static inline int xfrm_decode_session(struct net *net, struct sk_buff *skb, struct flowi *fl, 1216 unsigned int family) 1217 { 1218 return __xfrm_decode_session(net, skb, fl, family, 0); 1219 } 1220 1221 static inline int xfrm_decode_session_reverse(struct net *net, struct sk_buff *skb, 1222 struct flowi *fl, 1223 unsigned int family) 1224 { 1225 return __xfrm_decode_session(net, skb, fl, family, 1); 1226 } 1227 1228 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 1229 1230 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 1231 { 1232 struct net *net = dev_net(skb->dev); 1233 1234 if (!net->xfrm.policy_count[XFRM_POLICY_OUT] && 1235 net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT) 1236 return true; 1237 1238 return (skb_dst(skb)->flags & DST_NOXFRM) || 1239 __xfrm_route_forward(skb, family); 1240 } 1241 1242 static inline int xfrm4_route_forward(struct sk_buff *skb) 1243 { 1244 return xfrm_route_forward(skb, AF_INET); 1245 } 1246 1247 static inline int xfrm6_route_forward(struct sk_buff *skb) 1248 { 1249 return xfrm_route_forward(skb, AF_INET6); 1250 } 1251 1252 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk); 1253 1254 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) 1255 { 1256 if (!sk_fullsock(osk)) 1257 return 0; 1258 sk->sk_policy[0] = NULL; 1259 sk->sk_policy[1] = NULL; 1260 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1])) 1261 return __xfrm_sk_clone_policy(sk, osk); 1262 return 0; 1263 } 1264 1265 int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 1266 1267 static inline void xfrm_sk_free_policy(struct sock *sk) 1268 { 1269 struct xfrm_policy *pol; 1270 1271 pol = rcu_dereference_protected(sk->sk_policy[0], 1); 1272 if (unlikely(pol != NULL)) { 1273 xfrm_policy_delete(pol, XFRM_POLICY_MAX); 1274 sk->sk_policy[0] = NULL; 1275 } 1276 pol = rcu_dereference_protected(sk->sk_policy[1], 1); 1277 if (unlikely(pol != NULL)) { 1278 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1); 1279 sk->sk_policy[1] = NULL; 1280 } 1281 } 1282 1283 #else 1284 1285 static inline void xfrm_sk_free_policy(struct sock *sk) {} 1286 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; } 1287 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 1288 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 1289 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1290 { 1291 return 1; 1292 } 1293 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1294 { 1295 return 1; 1296 } 1297 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1298 { 1299 return 1; 1300 } 1301 static inline int xfrm_decode_session_reverse(struct net *net, struct sk_buff *skb, 1302 struct flowi *fl, 1303 unsigned int family) 1304 { 1305 return -ENOSYS; 1306 } 1307 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1308 struct sk_buff *skb) 1309 { 1310 return 1; 1311 } 1312 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1313 struct sk_buff *skb) 1314 { 1315 return 1; 1316 } 1317 #endif 1318 1319 static __inline__ 1320 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family) 1321 { 1322 switch (family){ 1323 case AF_INET: 1324 return (xfrm_address_t *)&fl->u.ip4.daddr; 1325 case AF_INET6: 1326 return (xfrm_address_t *)&fl->u.ip6.daddr; 1327 } 1328 return NULL; 1329 } 1330 1331 static __inline__ 1332 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family) 1333 { 1334 switch (family){ 1335 case AF_INET: 1336 return (xfrm_address_t *)&fl->u.ip4.saddr; 1337 case AF_INET6: 1338 return (xfrm_address_t *)&fl->u.ip6.saddr; 1339 } 1340 return NULL; 1341 } 1342 1343 static __inline__ 1344 void xfrm_flowi_addr_get(const struct flowi *fl, 1345 xfrm_address_t *saddr, xfrm_address_t *daddr, 1346 unsigned short family) 1347 { 1348 switch(family) { 1349 case AF_INET: 1350 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4)); 1351 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4)); 1352 break; 1353 case AF_INET6: 1354 saddr->in6 = fl->u.ip6.saddr; 1355 daddr->in6 = fl->u.ip6.daddr; 1356 break; 1357 } 1358 } 1359 1360 static __inline__ int 1361 __xfrm4_state_addr_check(const struct xfrm_state *x, 1362 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1363 { 1364 if (daddr->a4 == x->id.daddr.a4 && 1365 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 1366 return 1; 1367 return 0; 1368 } 1369 1370 static __inline__ int 1371 __xfrm6_state_addr_check(const struct xfrm_state *x, 1372 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1373 { 1374 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 1375 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) || 1376 ipv6_addr_any((struct in6_addr *)saddr) || 1377 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 1378 return 1; 1379 return 0; 1380 } 1381 1382 static __inline__ int 1383 xfrm_state_addr_check(const struct xfrm_state *x, 1384 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1385 unsigned short family) 1386 { 1387 switch (family) { 1388 case AF_INET: 1389 return __xfrm4_state_addr_check(x, daddr, saddr); 1390 case AF_INET6: 1391 return __xfrm6_state_addr_check(x, daddr, saddr); 1392 } 1393 return 0; 1394 } 1395 1396 static __inline__ int 1397 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl, 1398 unsigned short family) 1399 { 1400 switch (family) { 1401 case AF_INET: 1402 return __xfrm4_state_addr_check(x, 1403 (const xfrm_address_t *)&fl->u.ip4.daddr, 1404 (const xfrm_address_t *)&fl->u.ip4.saddr); 1405 case AF_INET6: 1406 return __xfrm6_state_addr_check(x, 1407 (const xfrm_address_t *)&fl->u.ip6.daddr, 1408 (const xfrm_address_t *)&fl->u.ip6.saddr); 1409 } 1410 return 0; 1411 } 1412 1413 static inline int xfrm_state_kern(const struct xfrm_state *x) 1414 { 1415 return atomic_read(&x->tunnel_users); 1416 } 1417 1418 static inline bool xfrm_id_proto_valid(u8 proto) 1419 { 1420 switch (proto) { 1421 case IPPROTO_AH: 1422 case IPPROTO_ESP: 1423 case IPPROTO_COMP: 1424 #if IS_ENABLED(CONFIG_IPV6) 1425 case IPPROTO_ROUTING: 1426 case IPPROTO_DSTOPTS: 1427 #endif 1428 return true; 1429 default: 1430 return false; 1431 } 1432 } 1433 1434 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */ 1435 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 1436 { 1437 return (!userproto || proto == userproto || 1438 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 1439 proto == IPPROTO_ESP || 1440 proto == IPPROTO_COMP))); 1441 } 1442 1443 /* 1444 * xfrm algorithm information 1445 */ 1446 struct xfrm_algo_aead_info { 1447 char *geniv; 1448 u16 icv_truncbits; 1449 }; 1450 1451 struct xfrm_algo_auth_info { 1452 u16 icv_truncbits; 1453 u16 icv_fullbits; 1454 }; 1455 1456 struct xfrm_algo_encr_info { 1457 char *geniv; 1458 u16 blockbits; 1459 u16 defkeybits; 1460 }; 1461 1462 struct xfrm_algo_comp_info { 1463 u16 threshold; 1464 }; 1465 1466 struct xfrm_algo_desc { 1467 char *name; 1468 char *compat; 1469 u8 available:1; 1470 u8 pfkey_supported:1; 1471 union { 1472 struct xfrm_algo_aead_info aead; 1473 struct xfrm_algo_auth_info auth; 1474 struct xfrm_algo_encr_info encr; 1475 struct xfrm_algo_comp_info comp; 1476 } uinfo; 1477 struct sadb_alg desc; 1478 }; 1479 1480 /* XFRM protocol handlers. */ 1481 struct xfrm4_protocol { 1482 int (*handler)(struct sk_buff *skb); 1483 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1484 int encap_type); 1485 int (*cb_handler)(struct sk_buff *skb, int err); 1486 int (*err_handler)(struct sk_buff *skb, u32 info); 1487 1488 struct xfrm4_protocol __rcu *next; 1489 int priority; 1490 }; 1491 1492 struct xfrm6_protocol { 1493 int (*handler)(struct sk_buff *skb); 1494 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1495 int encap_type); 1496 int (*cb_handler)(struct sk_buff *skb, int err); 1497 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1498 u8 type, u8 code, int offset, __be32 info); 1499 1500 struct xfrm6_protocol __rcu *next; 1501 int priority; 1502 }; 1503 1504 /* XFRM tunnel handlers. */ 1505 struct xfrm_tunnel { 1506 int (*handler)(struct sk_buff *skb); 1507 int (*cb_handler)(struct sk_buff *skb, int err); 1508 int (*err_handler)(struct sk_buff *skb, u32 info); 1509 1510 struct xfrm_tunnel __rcu *next; 1511 int priority; 1512 }; 1513 1514 struct xfrm6_tunnel { 1515 int (*handler)(struct sk_buff *skb); 1516 int (*cb_handler)(struct sk_buff *skb, int err); 1517 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1518 u8 type, u8 code, int offset, __be32 info); 1519 struct xfrm6_tunnel __rcu *next; 1520 int priority; 1521 }; 1522 1523 void xfrm_init(void); 1524 void xfrm4_init(void); 1525 int xfrm_state_init(struct net *net); 1526 void xfrm_state_fini(struct net *net); 1527 void xfrm4_state_init(void); 1528 void xfrm4_protocol_init(void); 1529 #ifdef CONFIG_XFRM 1530 int xfrm6_init(void); 1531 void xfrm6_fini(void); 1532 int xfrm6_state_init(void); 1533 void xfrm6_state_fini(void); 1534 int xfrm6_protocol_init(void); 1535 void xfrm6_protocol_fini(void); 1536 #else 1537 static inline int xfrm6_init(void) 1538 { 1539 return 0; 1540 } 1541 static inline void xfrm6_fini(void) 1542 { 1543 ; 1544 } 1545 #endif 1546 1547 #ifdef CONFIG_XFRM_STATISTICS 1548 int xfrm_proc_init(struct net *net); 1549 void xfrm_proc_fini(struct net *net); 1550 #endif 1551 1552 int xfrm_sysctl_init(struct net *net); 1553 #ifdef CONFIG_SYSCTL 1554 void xfrm_sysctl_fini(struct net *net); 1555 #else 1556 static inline void xfrm_sysctl_fini(struct net *net) 1557 { 1558 } 1559 #endif 1560 1561 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 1562 struct xfrm_address_filter *filter); 1563 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1564 int (*func)(struct xfrm_state *, int, void*), void *); 1565 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net); 1566 struct xfrm_state *xfrm_state_alloc(struct net *net); 1567 void xfrm_state_free(struct xfrm_state *x); 1568 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr, 1569 const xfrm_address_t *saddr, 1570 const struct flowi *fl, 1571 struct xfrm_tmpl *tmpl, 1572 struct xfrm_policy *pol, int *err, 1573 unsigned short family, u32 if_id); 1574 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id, 1575 xfrm_address_t *daddr, 1576 xfrm_address_t *saddr, 1577 unsigned short family, 1578 u8 mode, u8 proto, u32 reqid); 1579 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1580 unsigned short family); 1581 int xfrm_state_check_expire(struct xfrm_state *x); 1582 void xfrm_state_update_stats(struct net *net); 1583 #ifdef CONFIG_XFRM_OFFLOAD 1584 static inline void xfrm_dev_state_update_stats(struct xfrm_state *x) 1585 { 1586 struct xfrm_dev_offload *xdo = &x->xso; 1587 struct net_device *dev = xdo->dev; 1588 1589 if (dev && dev->xfrmdev_ops && 1590 dev->xfrmdev_ops->xdo_dev_state_update_stats) 1591 dev->xfrmdev_ops->xdo_dev_state_update_stats(x); 1592 1593 } 1594 #else 1595 static inline void xfrm_dev_state_update_stats(struct xfrm_state *x) {} 1596 #endif 1597 void xfrm_state_insert(struct xfrm_state *x); 1598 int xfrm_state_add(struct xfrm_state *x); 1599 int xfrm_state_update(struct xfrm_state *x); 1600 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark, 1601 const xfrm_address_t *daddr, __be32 spi, 1602 u8 proto, unsigned short family); 1603 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1604 const xfrm_address_t *daddr, 1605 const xfrm_address_t *saddr, 1606 u8 proto, 1607 unsigned short family); 1608 #ifdef CONFIG_XFRM_SUB_POLICY 1609 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1610 unsigned short family); 1611 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1612 unsigned short family); 1613 #else 1614 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s, 1615 int n, unsigned short family) 1616 { 1617 } 1618 1619 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s, 1620 int n, unsigned short family) 1621 { 1622 } 1623 #endif 1624 1625 struct xfrmk_sadinfo { 1626 u32 sadhcnt; /* current hash bkts */ 1627 u32 sadhmcnt; /* max allowed hash bkts */ 1628 u32 sadcnt; /* current running count */ 1629 }; 1630 1631 struct xfrmk_spdinfo { 1632 u32 incnt; 1633 u32 outcnt; 1634 u32 fwdcnt; 1635 u32 inscnt; 1636 u32 outscnt; 1637 u32 fwdscnt; 1638 u32 spdhcnt; 1639 u32 spdhmcnt; 1640 }; 1641 1642 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1643 int xfrm_state_delete(struct xfrm_state *x); 1644 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync); 1645 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid); 1646 int xfrm_dev_policy_flush(struct net *net, struct net_device *dev, 1647 bool task_valid); 1648 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); 1649 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); 1650 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq); 1651 int xfrm_init_replay(struct xfrm_state *x, struct netlink_ext_ack *extack); 1652 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu); 1653 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload, 1654 struct netlink_ext_ack *extack); 1655 int xfrm_init_state(struct xfrm_state *x); 1656 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type); 1657 int xfrm_input_resume(struct sk_buff *skb, int nexthdr); 1658 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb, 1659 int (*finish)(struct net *, struct sock *, 1660 struct sk_buff *)); 1661 int xfrm_trans_queue(struct sk_buff *skb, 1662 int (*finish)(struct net *, struct sock *, 1663 struct sk_buff *)); 1664 int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err); 1665 int xfrm_output(struct sock *sk, struct sk_buff *skb); 1666 1667 #if IS_ENABLED(CONFIG_NET_PKTGEN) 1668 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb); 1669 #endif 1670 1671 void xfrm_local_error(struct sk_buff *skb, int mtu); 1672 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1673 int encap_type); 1674 int xfrm4_transport_finish(struct sk_buff *skb, int async); 1675 int xfrm4_rcv(struct sk_buff *skb); 1676 1677 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1678 { 1679 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL; 1680 XFRM_SPI_SKB_CB(skb)->family = AF_INET; 1681 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); 1682 return xfrm_input(skb, nexthdr, spi, 0); 1683 } 1684 1685 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1686 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol); 1687 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol); 1688 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1689 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1690 void xfrm4_local_error(struct sk_buff *skb, u32 mtu); 1691 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi, 1692 struct ip6_tnl *t); 1693 int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1694 int encap_type); 1695 int xfrm6_transport_finish(struct sk_buff *skb, int async); 1696 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t); 1697 int xfrm6_rcv(struct sk_buff *skb); 1698 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1699 xfrm_address_t *saddr, u8 proto); 1700 void xfrm6_local_error(struct sk_buff *skb, u32 mtu); 1701 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol); 1702 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol); 1703 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1704 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1705 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr); 1706 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr); 1707 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1708 1709 #ifdef CONFIG_XFRM 1710 void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu); 1711 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1712 int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1713 struct sk_buff *xfrm4_gro_udp_encap_rcv(struct sock *sk, struct list_head *head, 1714 struct sk_buff *skb); 1715 struct sk_buff *xfrm6_gro_udp_encap_rcv(struct sock *sk, struct list_head *head, 1716 struct sk_buff *skb); 1717 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, 1718 int optlen); 1719 #else 1720 static inline int xfrm_user_policy(struct sock *sk, int optname, 1721 sockptr_t optval, int optlen) 1722 { 1723 return -ENOPROTOOPT; 1724 } 1725 #endif 1726 1727 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif, 1728 const xfrm_address_t *saddr, 1729 const xfrm_address_t *daddr, 1730 int family, u32 mark); 1731 1732 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); 1733 1734 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); 1735 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, 1736 int (*func)(struct xfrm_policy *, int, int, void*), 1737 void *); 1738 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net); 1739 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1740 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, 1741 const struct xfrm_mark *mark, 1742 u32 if_id, u8 type, int dir, 1743 struct xfrm_selector *sel, 1744 struct xfrm_sec_ctx *ctx, int delete, 1745 int *err); 1746 struct xfrm_policy *xfrm_policy_byid(struct net *net, 1747 const struct xfrm_mark *mark, u32 if_id, 1748 u8 type, int dir, u32 id, int delete, 1749 int *err); 1750 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid); 1751 void xfrm_policy_hash_rebuild(struct net *net); 1752 u32 xfrm_get_acqseq(void); 1753 int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack); 1754 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi, 1755 struct netlink_ext_ack *extack); 1756 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, 1757 u8 mode, u32 reqid, u32 if_id, u8 proto, 1758 const xfrm_address_t *daddr, 1759 const xfrm_address_t *saddr, int create, 1760 unsigned short family); 1761 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1762 1763 #ifdef CONFIG_XFRM_MIGRATE 1764 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1765 const struct xfrm_migrate *m, int num_bundles, 1766 const struct xfrm_kmaddress *k, 1767 const struct xfrm_encap_tmpl *encap); 1768 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net, 1769 u32 if_id); 1770 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 1771 struct xfrm_migrate *m, 1772 struct xfrm_encap_tmpl *encap); 1773 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1774 struct xfrm_migrate *m, int num_bundles, 1775 struct xfrm_kmaddress *k, struct net *net, 1776 struct xfrm_encap_tmpl *encap, u32 if_id, 1777 struct netlink_ext_ack *extack); 1778 #endif 1779 1780 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1781 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid); 1782 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, 1783 xfrm_address_t *addr); 1784 1785 void xfrm_input_init(void); 1786 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1787 1788 void xfrm_probe_algs(void); 1789 int xfrm_count_pfkey_auth_supported(void); 1790 int xfrm_count_pfkey_enc_supported(void); 1791 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1792 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1793 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1794 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1795 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1796 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe); 1797 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe); 1798 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe); 1799 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, 1800 int probe); 1801 1802 static inline bool xfrm6_addr_equal(const xfrm_address_t *a, 1803 const xfrm_address_t *b) 1804 { 1805 return ipv6_addr_equal((const struct in6_addr *)a, 1806 (const struct in6_addr *)b); 1807 } 1808 1809 static inline bool xfrm_addr_equal(const xfrm_address_t *a, 1810 const xfrm_address_t *b, 1811 sa_family_t family) 1812 { 1813 switch (family) { 1814 default: 1815 case AF_INET: 1816 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0; 1817 case AF_INET6: 1818 return xfrm6_addr_equal(a, b); 1819 } 1820 } 1821 1822 static inline int xfrm_policy_id2dir(u32 index) 1823 { 1824 return index & 7; 1825 } 1826 1827 #ifdef CONFIG_XFRM 1828 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq); 1829 int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq); 1830 void xfrm_replay_notify(struct xfrm_state *x, int event); 1831 int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb); 1832 int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq); 1833 1834 static inline int xfrm_aevent_is_on(struct net *net) 1835 { 1836 struct sock *nlsk; 1837 int ret = 0; 1838 1839 rcu_read_lock(); 1840 nlsk = rcu_dereference(net->xfrm.nlsk); 1841 if (nlsk) 1842 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1843 rcu_read_unlock(); 1844 return ret; 1845 } 1846 1847 static inline int xfrm_acquire_is_on(struct net *net) 1848 { 1849 struct sock *nlsk; 1850 int ret = 0; 1851 1852 rcu_read_lock(); 1853 nlsk = rcu_dereference(net->xfrm.nlsk); 1854 if (nlsk) 1855 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE); 1856 rcu_read_unlock(); 1857 1858 return ret; 1859 } 1860 #endif 1861 1862 static inline unsigned int aead_len(struct xfrm_algo_aead *alg) 1863 { 1864 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1865 } 1866 1867 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg) 1868 { 1869 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1870 } 1871 1872 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg) 1873 { 1874 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1875 } 1876 1877 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn) 1878 { 1879 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32); 1880 } 1881 1882 #ifdef CONFIG_XFRM_MIGRATE 1883 static inline int xfrm_replay_clone(struct xfrm_state *x, 1884 struct xfrm_state *orig) 1885 { 1886 1887 x->replay_esn = kmemdup(orig->replay_esn, 1888 xfrm_replay_state_esn_len(orig->replay_esn), 1889 GFP_KERNEL); 1890 if (!x->replay_esn) 1891 return -ENOMEM; 1892 x->preplay_esn = kmemdup(orig->preplay_esn, 1893 xfrm_replay_state_esn_len(orig->preplay_esn), 1894 GFP_KERNEL); 1895 if (!x->preplay_esn) 1896 return -ENOMEM; 1897 1898 return 0; 1899 } 1900 1901 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig) 1902 { 1903 return kmemdup(orig, aead_len(orig), GFP_KERNEL); 1904 } 1905 1906 1907 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1908 { 1909 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); 1910 } 1911 1912 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig) 1913 { 1914 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL); 1915 } 1916 1917 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1918 { 1919 int i; 1920 for (i = 0; i < n; i++) 1921 xfrm_state_put(*(states + i)); 1922 } 1923 1924 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1925 { 1926 int i; 1927 for (i = 0; i < n; i++) 1928 xfrm_state_delete(*(states + i)); 1929 } 1930 #endif 1931 1932 void __init xfrm_dev_init(void); 1933 1934 #ifdef CONFIG_XFRM_OFFLOAD 1935 void xfrm_dev_resume(struct sk_buff *skb); 1936 void xfrm_dev_backlog(struct softnet_data *sd); 1937 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again); 1938 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, 1939 struct xfrm_user_offload *xuo, 1940 struct netlink_ext_ack *extack); 1941 int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp, 1942 struct xfrm_user_offload *xuo, u8 dir, 1943 struct netlink_ext_ack *extack); 1944 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x); 1945 1946 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 1947 { 1948 struct xfrm_dev_offload *xso = &x->xso; 1949 1950 if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn) 1951 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x); 1952 } 1953 1954 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 1955 { 1956 struct xfrm_state *x = dst->xfrm; 1957 struct xfrm_dst *xdst; 1958 1959 if (!x || !x->type_offload) 1960 return false; 1961 1962 xdst = (struct xfrm_dst *) dst; 1963 if (!x->xso.offload_handle && !xdst->child->xfrm) 1964 return true; 1965 if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) && 1966 !xdst->child->xfrm) 1967 return true; 1968 1969 return false; 1970 } 1971 1972 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 1973 { 1974 struct xfrm_dev_offload *xso = &x->xso; 1975 1976 if (xso->dev) 1977 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x); 1978 } 1979 1980 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1981 { 1982 struct xfrm_dev_offload *xso = &x->xso; 1983 struct net_device *dev = xso->dev; 1984 1985 if (dev && dev->xfrmdev_ops) { 1986 if (dev->xfrmdev_ops->xdo_dev_state_free) 1987 dev->xfrmdev_ops->xdo_dev_state_free(x); 1988 xso->dev = NULL; 1989 xso->type = XFRM_DEV_OFFLOAD_UNSPECIFIED; 1990 netdev_put(dev, &xso->dev_tracker); 1991 } 1992 } 1993 1994 static inline void xfrm_dev_policy_delete(struct xfrm_policy *x) 1995 { 1996 struct xfrm_dev_offload *xdo = &x->xdo; 1997 struct net_device *dev = xdo->dev; 1998 1999 if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_policy_delete) 2000 dev->xfrmdev_ops->xdo_dev_policy_delete(x); 2001 } 2002 2003 static inline void xfrm_dev_policy_free(struct xfrm_policy *x) 2004 { 2005 struct xfrm_dev_offload *xdo = &x->xdo; 2006 struct net_device *dev = xdo->dev; 2007 2008 if (dev && dev->xfrmdev_ops) { 2009 if (dev->xfrmdev_ops->xdo_dev_policy_free) 2010 dev->xfrmdev_ops->xdo_dev_policy_free(x); 2011 xdo->dev = NULL; 2012 netdev_put(dev, &xdo->dev_tracker); 2013 } 2014 } 2015 #else 2016 static inline void xfrm_dev_resume(struct sk_buff *skb) 2017 { 2018 } 2019 2020 static inline void xfrm_dev_backlog(struct softnet_data *sd) 2021 { 2022 } 2023 2024 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again) 2025 { 2026 return skb; 2027 } 2028 2029 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo, struct netlink_ext_ack *extack) 2030 { 2031 return 0; 2032 } 2033 2034 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 2035 { 2036 } 2037 2038 static inline void xfrm_dev_state_free(struct xfrm_state *x) 2039 { 2040 } 2041 2042 static inline int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp, 2043 struct xfrm_user_offload *xuo, u8 dir, 2044 struct netlink_ext_ack *extack) 2045 { 2046 return 0; 2047 } 2048 2049 static inline void xfrm_dev_policy_delete(struct xfrm_policy *x) 2050 { 2051 } 2052 2053 static inline void xfrm_dev_policy_free(struct xfrm_policy *x) 2054 { 2055 } 2056 2057 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) 2058 { 2059 return false; 2060 } 2061 2062 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) 2063 { 2064 } 2065 2066 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 2067 { 2068 return false; 2069 } 2070 #endif 2071 2072 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) 2073 { 2074 if (attrs[XFRMA_MARK]) 2075 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark)); 2076 else 2077 m->v = m->m = 0; 2078 2079 return m->v & m->m; 2080 } 2081 2082 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m) 2083 { 2084 int ret = 0; 2085 2086 if (m->m | m->v) 2087 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); 2088 return ret; 2089 } 2090 2091 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x) 2092 { 2093 struct xfrm_mark *m = &x->props.smark; 2094 2095 return (m->v & m->m) | (mark & ~m->m); 2096 } 2097 2098 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id) 2099 { 2100 int ret = 0; 2101 2102 if (if_id) 2103 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id); 2104 return ret; 2105 } 2106 2107 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x, 2108 unsigned int family) 2109 { 2110 bool tunnel = false; 2111 2112 switch(family) { 2113 case AF_INET: 2114 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) 2115 tunnel = true; 2116 break; 2117 case AF_INET6: 2118 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) 2119 tunnel = true; 2120 break; 2121 } 2122 if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL)) 2123 return -EINVAL; 2124 2125 return 0; 2126 } 2127 2128 extern const int xfrm_msg_min[XFRM_NR_MSGTYPES]; 2129 extern const struct nla_policy xfrma_policy[XFRMA_MAX+1]; 2130 2131 struct xfrm_translator { 2132 /* Allocate frag_list and put compat translation there */ 2133 int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src); 2134 2135 /* Allocate nlmsg with 64-bit translaton of received 32-bit message */ 2136 struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh, 2137 int maxtype, const struct nla_policy *policy, 2138 struct netlink_ext_ack *extack); 2139 2140 /* Translate 32-bit user_policy from sockptr */ 2141 int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen); 2142 2143 struct module *owner; 2144 }; 2145 2146 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT) 2147 extern int xfrm_register_translator(struct xfrm_translator *xtr); 2148 extern int xfrm_unregister_translator(struct xfrm_translator *xtr); 2149 extern struct xfrm_translator *xfrm_get_translator(void); 2150 extern void xfrm_put_translator(struct xfrm_translator *xtr); 2151 #else 2152 static inline struct xfrm_translator *xfrm_get_translator(void) 2153 { 2154 return NULL; 2155 } 2156 static inline void xfrm_put_translator(struct xfrm_translator *xtr) 2157 { 2158 } 2159 #endif 2160 2161 #if IS_ENABLED(CONFIG_IPV6) 2162 static inline bool xfrm6_local_dontfrag(const struct sock *sk) 2163 { 2164 int proto; 2165 2166 if (!sk || sk->sk_family != AF_INET6) 2167 return false; 2168 2169 proto = sk->sk_protocol; 2170 if (proto == IPPROTO_UDP || proto == IPPROTO_RAW) 2171 return inet6_test_bit(DONTFRAG, sk); 2172 2173 return false; 2174 } 2175 #endif 2176 2177 #if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \ 2178 (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES)) 2179 2180 extern struct metadata_dst __percpu *xfrm_bpf_md_dst; 2181 2182 int register_xfrm_interface_bpf(void); 2183 2184 #else 2185 2186 static inline int register_xfrm_interface_bpf(void) 2187 { 2188 return 0; 2189 } 2190 2191 #endif 2192 2193 #if IS_ENABLED(CONFIG_DEBUG_INFO_BTF) 2194 int register_xfrm_state_bpf(void); 2195 #else 2196 static inline int register_xfrm_state_bpf(void) 2197 { 2198 return 0; 2199 } 2200 #endif 2201 2202 #endif /* _NET_XFRM_H */ 2203