1 #ifndef _NET_XFRM_H 2 #define _NET_XFRM_H 3 4 #include <linux/compiler.h> 5 #include <linux/xfrm.h> 6 #include <linux/spinlock.h> 7 #include <linux/list.h> 8 #include <linux/skbuff.h> 9 #include <linux/socket.h> 10 #include <linux/pfkeyv2.h> 11 #include <linux/ipsec.h> 12 #include <linux/in6.h> 13 #include <linux/mutex.h> 14 #include <linux/audit.h> 15 #include <linux/slab.h> 16 #include <linux/refcount.h> 17 18 #include <net/sock.h> 19 #include <net/dst.h> 20 #include <net/ip.h> 21 #include <net/route.h> 22 #include <net/ipv6.h> 23 #include <net/ip6_fib.h> 24 #include <net/flow.h> 25 26 #include <linux/interrupt.h> 27 28 #ifdef CONFIG_XFRM_STATISTICS 29 #include <net/snmp.h> 30 #endif 31 32 #define XFRM_PROTO_ESP 50 33 #define XFRM_PROTO_AH 51 34 #define XFRM_PROTO_COMP 108 35 #define XFRM_PROTO_IPIP 4 36 #define XFRM_PROTO_IPV6 41 37 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING 38 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS 39 40 #define XFRM_ALIGN4(len) (((len) + 3) & ~3) 41 #define XFRM_ALIGN8(len) (((len) + 7) & ~7) 42 #define MODULE_ALIAS_XFRM_MODE(family, encap) \ 43 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap)) 44 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \ 45 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto)) 46 #define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \ 47 MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto)) 48 49 #ifdef CONFIG_XFRM_STATISTICS 50 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field) 51 #else 52 #define XFRM_INC_STATS(net, field) ((void)(net)) 53 #endif 54 55 56 /* Organization of SPD aka "XFRM rules" 57 ------------------------------------ 58 59 Basic objects: 60 - policy rule, struct xfrm_policy (=SPD entry) 61 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) 62 - instance of a transformer, struct xfrm_state (=SA) 63 - template to clone xfrm_state, struct xfrm_tmpl 64 65 SPD is plain linear list of xfrm_policy rules, ordered by priority. 66 (To be compatible with existing pfkeyv2 implementations, 67 many rules with priority of 0x7fffffff are allowed to exist and 68 such rules are ordered in an unpredictable way, thanks to bsd folks.) 69 70 Lookup is plain linear search until the first match with selector. 71 72 If "action" is "block", then we prohibit the flow, otherwise: 73 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, 74 policy entry has list of up to XFRM_MAX_DEPTH transformations, 75 described by templates xfrm_tmpl. Each template is resolved 76 to a complete xfrm_state (see below) and we pack bundle of transformations 77 to a dst_entry returned to requestor. 78 79 dst -. xfrm .-> xfrm_state #1 80 |---. child .-> dst -. xfrm .-> xfrm_state #2 81 |---. child .-> dst -. xfrm .-> xfrm_state #3 82 |---. child .-> NULL 83 84 Bundles are cached at xrfm_policy struct (field ->bundles). 85 86 87 Resolution of xrfm_tmpl 88 ----------------------- 89 Template contains: 90 1. ->mode Mode: transport or tunnel 91 2. ->id.proto Protocol: AH/ESP/IPCOMP 92 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. 93 Q: allow to resolve security gateway? 94 4. ->id.spi If not zero, static SPI. 95 5. ->saddr Local tunnel endpoint, ignored for transport mode. 96 6. ->algos List of allowed algos. Plain bitmask now. 97 Q: ealgos, aalgos, calgos. What a mess... 98 7. ->share Sharing mode. 99 Q: how to implement private sharing mode? To add struct sock* to 100 flow id? 101 102 Having this template we search through SAD searching for entries 103 with appropriate mode/proto/algo, permitted by selector. 104 If no appropriate entry found, it is requested from key manager. 105 106 PROBLEMS: 107 Q: How to find all the bundles referring to a physical path for 108 PMTU discovery? Seems, dst should contain list of all parents... 109 and enter to infinite locking hierarchy disaster. 110 No! It is easier, we will not search for them, let them find us. 111 We add genid to each dst plus pointer to genid of raw IP route, 112 pmtu disc will update pmtu on raw IP route and increase its genid. 113 dst_check() will see this for top level and trigger resyncing 114 metrics. Plus, it will be made via sk->sk_dst_cache. Solved. 115 */ 116 117 struct xfrm_state_walk { 118 struct list_head all; 119 u8 state; 120 u8 dying; 121 u8 proto; 122 u32 seq; 123 struct xfrm_address_filter *filter; 124 }; 125 126 struct xfrm_state_offload { 127 struct net_device *dev; 128 unsigned long offload_handle; 129 unsigned int num_exthdrs; 130 u8 flags; 131 }; 132 133 /* Full description of state of transformer. */ 134 struct xfrm_state { 135 possible_net_t xs_net; 136 union { 137 struct hlist_node gclist; 138 struct hlist_node bydst; 139 }; 140 struct hlist_node bysrc; 141 struct hlist_node byspi; 142 143 refcount_t refcnt; 144 spinlock_t lock; 145 146 struct xfrm_id id; 147 struct xfrm_selector sel; 148 struct xfrm_mark mark; 149 u32 tfcpad; 150 151 u32 genid; 152 153 /* Key manager bits */ 154 struct xfrm_state_walk km; 155 156 /* Parameters of this state. */ 157 struct { 158 u32 reqid; 159 u8 mode; 160 u8 replay_window; 161 u8 aalgo, ealgo, calgo; 162 u8 flags; 163 u16 family; 164 xfrm_address_t saddr; 165 int header_len; 166 int trailer_len; 167 u32 extra_flags; 168 u32 output_mark; 169 } props; 170 171 struct xfrm_lifetime_cfg lft; 172 173 /* Data for transformer */ 174 struct xfrm_algo_auth *aalg; 175 struct xfrm_algo *ealg; 176 struct xfrm_algo *calg; 177 struct xfrm_algo_aead *aead; 178 const char *geniv; 179 180 /* Data for encapsulator */ 181 struct xfrm_encap_tmpl *encap; 182 183 /* Data for care-of address */ 184 xfrm_address_t *coaddr; 185 186 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 187 struct xfrm_state *tunnel; 188 189 /* If a tunnel, number of users + 1 */ 190 atomic_t tunnel_users; 191 192 /* State for replay detection */ 193 struct xfrm_replay_state replay; 194 struct xfrm_replay_state_esn *replay_esn; 195 196 /* Replay detection state at the time we sent the last notification */ 197 struct xfrm_replay_state preplay; 198 struct xfrm_replay_state_esn *preplay_esn; 199 200 /* The functions for replay detection. */ 201 const struct xfrm_replay *repl; 202 203 /* internal flag that only holds state for delayed aevent at the 204 * moment 205 */ 206 u32 xflags; 207 208 /* Replay detection notification settings */ 209 u32 replay_maxage; 210 u32 replay_maxdiff; 211 212 /* Replay detection notification timer */ 213 struct timer_list rtimer; 214 215 /* Statistics */ 216 struct xfrm_stats stats; 217 218 struct xfrm_lifetime_cur curlft; 219 struct tasklet_hrtimer mtimer; 220 221 struct xfrm_state_offload xso; 222 223 /* used to fix curlft->add_time when changing date */ 224 long saved_tmo; 225 226 /* Last used time */ 227 unsigned long lastused; 228 229 struct page_frag xfrag; 230 231 /* Reference to data common to all the instances of this 232 * transformer. */ 233 const struct xfrm_type *type; 234 struct xfrm_mode *inner_mode; 235 struct xfrm_mode *inner_mode_iaf; 236 struct xfrm_mode *outer_mode; 237 238 const struct xfrm_type_offload *type_offload; 239 240 /* Security context */ 241 struct xfrm_sec_ctx *security; 242 243 /* Private data of this transformer, format is opaque, 244 * interpreted by xfrm_type methods. */ 245 void *data; 246 }; 247 248 static inline struct net *xs_net(struct xfrm_state *x) 249 { 250 return read_pnet(&x->xs_net); 251 } 252 253 /* xflags - make enum if more show up */ 254 #define XFRM_TIME_DEFER 1 255 #define XFRM_SOFT_EXPIRE 2 256 257 enum { 258 XFRM_STATE_VOID, 259 XFRM_STATE_ACQ, 260 XFRM_STATE_VALID, 261 XFRM_STATE_ERROR, 262 XFRM_STATE_EXPIRED, 263 XFRM_STATE_DEAD 264 }; 265 266 /* callback structure passed from either netlink or pfkey */ 267 struct km_event { 268 union { 269 u32 hard; 270 u32 proto; 271 u32 byid; 272 u32 aevent; 273 u32 type; 274 } data; 275 276 u32 seq; 277 u32 portid; 278 u32 event; 279 struct net *net; 280 }; 281 282 struct xfrm_replay { 283 void (*advance)(struct xfrm_state *x, __be32 net_seq); 284 int (*check)(struct xfrm_state *x, 285 struct sk_buff *skb, 286 __be32 net_seq); 287 int (*recheck)(struct xfrm_state *x, 288 struct sk_buff *skb, 289 __be32 net_seq); 290 void (*notify)(struct xfrm_state *x, int event); 291 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb); 292 }; 293 294 struct net_device; 295 struct xfrm_type; 296 struct xfrm_dst; 297 struct xfrm_policy_afinfo { 298 struct dst_ops *dst_ops; 299 struct dst_entry *(*dst_lookup)(struct net *net, 300 int tos, int oif, 301 const xfrm_address_t *saddr, 302 const xfrm_address_t *daddr, 303 u32 mark); 304 int (*get_saddr)(struct net *net, int oif, 305 xfrm_address_t *saddr, 306 xfrm_address_t *daddr, 307 u32 mark); 308 void (*decode_session)(struct sk_buff *skb, 309 struct flowi *fl, 310 int reverse); 311 int (*get_tos)(const struct flowi *fl); 312 int (*init_path)(struct xfrm_dst *path, 313 struct dst_entry *dst, 314 int nfheader_len); 315 int (*fill_dst)(struct xfrm_dst *xdst, 316 struct net_device *dev, 317 const struct flowi *fl); 318 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig); 319 }; 320 321 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family); 322 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo); 323 void km_policy_notify(struct xfrm_policy *xp, int dir, 324 const struct km_event *c); 325 void xfrm_policy_cache_flush(void); 326 void km_state_notify(struct xfrm_state *x, const struct km_event *c); 327 328 struct xfrm_tmpl; 329 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, 330 struct xfrm_policy *pol); 331 void km_state_expired(struct xfrm_state *x, int hard, u32 portid); 332 int __xfrm_state_delete(struct xfrm_state *x); 333 334 struct xfrm_state_afinfo { 335 unsigned int family; 336 unsigned int proto; 337 __be16 eth_proto; 338 struct module *owner; 339 const struct xfrm_type *type_map[IPPROTO_MAX]; 340 const struct xfrm_type_offload *type_offload_map[IPPROTO_MAX]; 341 struct xfrm_mode *mode_map[XFRM_MODE_MAX]; 342 343 int (*init_flags)(struct xfrm_state *x); 344 void (*init_tempsel)(struct xfrm_selector *sel, 345 const struct flowi *fl); 346 void (*init_temprop)(struct xfrm_state *x, 347 const struct xfrm_tmpl *tmpl, 348 const xfrm_address_t *daddr, 349 const xfrm_address_t *saddr); 350 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n); 351 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n); 352 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb); 353 int (*output_finish)(struct sock *sk, struct sk_buff *skb); 354 int (*extract_input)(struct xfrm_state *x, 355 struct sk_buff *skb); 356 int (*extract_output)(struct xfrm_state *x, 357 struct sk_buff *skb); 358 int (*transport_finish)(struct sk_buff *skb, 359 int async); 360 void (*local_error)(struct sk_buff *skb, u32 mtu); 361 }; 362 363 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 364 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 365 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); 366 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family); 367 368 struct xfrm_input_afinfo { 369 unsigned int family; 370 int (*callback)(struct sk_buff *skb, u8 protocol, 371 int err); 372 }; 373 374 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo); 375 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo); 376 377 void xfrm_state_delete_tunnel(struct xfrm_state *x); 378 379 struct xfrm_type { 380 char *description; 381 struct module *owner; 382 u8 proto; 383 u8 flags; 384 #define XFRM_TYPE_NON_FRAGMENT 1 385 #define XFRM_TYPE_REPLAY_PROT 2 386 #define XFRM_TYPE_LOCAL_COADDR 4 387 #define XFRM_TYPE_REMOTE_COADDR 8 388 389 int (*init_state)(struct xfrm_state *x); 390 void (*destructor)(struct xfrm_state *); 391 int (*input)(struct xfrm_state *, struct sk_buff *skb); 392 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 393 int (*reject)(struct xfrm_state *, struct sk_buff *, 394 const struct flowi *); 395 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **); 396 /* Estimate maximal size of result of transformation of a dgram */ 397 u32 (*get_mtu)(struct xfrm_state *, int size); 398 }; 399 400 int xfrm_register_type(const struct xfrm_type *type, unsigned short family); 401 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); 402 403 struct xfrm_type_offload { 404 char *description; 405 struct module *owner; 406 u8 proto; 407 void (*encap)(struct xfrm_state *, struct sk_buff *pskb); 408 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb); 409 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features); 410 }; 411 412 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family); 413 int xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family); 414 415 struct xfrm_mode { 416 /* 417 * Remove encapsulation header. 418 * 419 * The IP header will be moved over the top of the encapsulation 420 * header. 421 * 422 * On entry, the transport header shall point to where the IP header 423 * should be and the network header shall be set to where the IP 424 * header currently is. skb->data shall point to the start of the 425 * payload. 426 */ 427 int (*input2)(struct xfrm_state *x, struct sk_buff *skb); 428 429 /* 430 * This is the actual input entry point. 431 * 432 * For transport mode and equivalent this would be identical to 433 * input2 (which does not need to be set). While tunnel mode 434 * and equivalent would set this to the tunnel encapsulation function 435 * xfrm4_prepare_input that would in turn call input2. 436 */ 437 int (*input)(struct xfrm_state *x, struct sk_buff *skb); 438 439 /* 440 * Add encapsulation header. 441 * 442 * On exit, the transport header will be set to the start of the 443 * encapsulation header to be filled in by x->type->output and 444 * the mac header will be set to the nextheader (protocol for 445 * IPv4) field of the extension header directly preceding the 446 * encapsulation header, or in its absence, that of the top IP 447 * header. The value of the network header will always point 448 * to the top IP header while skb->data will point to the payload. 449 */ 450 int (*output2)(struct xfrm_state *x,struct sk_buff *skb); 451 452 /* 453 * This is the actual output entry point. 454 * 455 * For transport mode and equivalent this would be identical to 456 * output2 (which does not need to be set). While tunnel mode 457 * and equivalent would set this to a tunnel encapsulation function 458 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn 459 * call output2. 460 */ 461 int (*output)(struct xfrm_state *x, struct sk_buff *skb); 462 463 /* 464 * Adjust pointers into the packet and do GSO segmentation. 465 */ 466 struct sk_buff *(*gso_segment)(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features); 467 468 /* 469 * Adjust pointers into the packet when IPsec is done at layer2. 470 */ 471 void (*xmit)(struct xfrm_state *x, struct sk_buff *skb); 472 473 struct xfrm_state_afinfo *afinfo; 474 struct module *owner; 475 unsigned int encap; 476 int flags; 477 }; 478 479 /* Flags for xfrm_mode. */ 480 enum { 481 XFRM_MODE_FLAG_TUNNEL = 1, 482 }; 483 484 int xfrm_register_mode(struct xfrm_mode *mode, int family); 485 int xfrm_unregister_mode(struct xfrm_mode *mode, int family); 486 487 static inline int xfrm_af2proto(unsigned int family) 488 { 489 switch(family) { 490 case AF_INET: 491 return IPPROTO_IPIP; 492 case AF_INET6: 493 return IPPROTO_IPV6; 494 default: 495 return 0; 496 } 497 } 498 499 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto) 500 { 501 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) || 502 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6)) 503 return x->inner_mode; 504 else 505 return x->inner_mode_iaf; 506 } 507 508 struct xfrm_tmpl { 509 /* id in template is interpreted as: 510 * daddr - destination of tunnel, may be zero for transport mode. 511 * spi - zero to acquire spi. Not zero if spi is static, then 512 * daddr must be fixed too. 513 * proto - AH/ESP/IPCOMP 514 */ 515 struct xfrm_id id; 516 517 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 518 xfrm_address_t saddr; 519 520 unsigned short encap_family; 521 522 u32 reqid; 523 524 /* Mode: transport, tunnel etc. */ 525 u8 mode; 526 527 /* Sharing mode: unique, this session only, this user only etc. */ 528 u8 share; 529 530 /* May skip this transfomration if no SA is found */ 531 u8 optional; 532 533 /* Skip aalgos/ealgos/calgos checks. */ 534 u8 allalgs; 535 536 /* Bit mask of algos allowed for acquisition */ 537 u32 aalgos; 538 u32 ealgos; 539 u32 calgos; 540 }; 541 542 #define XFRM_MAX_DEPTH 6 543 #define XFRM_MAX_OFFLOAD_DEPTH 1 544 545 struct xfrm_policy_walk_entry { 546 struct list_head all; 547 u8 dead; 548 }; 549 550 struct xfrm_policy_walk { 551 struct xfrm_policy_walk_entry walk; 552 u8 type; 553 u32 seq; 554 }; 555 556 struct xfrm_policy_queue { 557 struct sk_buff_head hold_queue; 558 struct timer_list hold_timer; 559 unsigned long timeout; 560 }; 561 562 struct xfrm_policy { 563 possible_net_t xp_net; 564 struct hlist_node bydst; 565 struct hlist_node byidx; 566 567 /* This lock only affects elements except for entry. */ 568 rwlock_t lock; 569 refcount_t refcnt; 570 struct timer_list timer; 571 572 atomic_t genid; 573 u32 priority; 574 u32 index; 575 struct xfrm_mark mark; 576 struct xfrm_selector selector; 577 struct xfrm_lifetime_cfg lft; 578 struct xfrm_lifetime_cur curlft; 579 struct xfrm_policy_walk_entry walk; 580 struct xfrm_policy_queue polq; 581 u8 type; 582 u8 action; 583 u8 flags; 584 u8 xfrm_nr; 585 u16 family; 586 struct xfrm_sec_ctx *security; 587 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 588 struct rcu_head rcu; 589 }; 590 591 static inline struct net *xp_net(const struct xfrm_policy *xp) 592 { 593 return read_pnet(&xp->xp_net); 594 } 595 596 struct xfrm_kmaddress { 597 xfrm_address_t local; 598 xfrm_address_t remote; 599 u32 reserved; 600 u16 family; 601 }; 602 603 struct xfrm_migrate { 604 xfrm_address_t old_daddr; 605 xfrm_address_t old_saddr; 606 xfrm_address_t new_daddr; 607 xfrm_address_t new_saddr; 608 u8 proto; 609 u8 mode; 610 u16 reserved; 611 u32 reqid; 612 u16 old_family; 613 u16 new_family; 614 }; 615 616 #define XFRM_KM_TIMEOUT 30 617 /* what happened */ 618 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 619 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 620 621 /* default aevent timeout in units of 100ms */ 622 #define XFRM_AE_ETIME 10 623 /* Async Event timer multiplier */ 624 #define XFRM_AE_ETH_M 10 625 /* default seq threshold size */ 626 #define XFRM_AE_SEQT_SIZE 2 627 628 struct xfrm_mgr { 629 struct list_head list; 630 int (*notify)(struct xfrm_state *x, const struct km_event *c); 631 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp); 632 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 633 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 634 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c); 635 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 636 int (*migrate)(const struct xfrm_selector *sel, 637 u8 dir, u8 type, 638 const struct xfrm_migrate *m, 639 int num_bundles, 640 const struct xfrm_kmaddress *k, 641 const struct xfrm_encap_tmpl *encap); 642 bool (*is_alive)(const struct km_event *c); 643 }; 644 645 int xfrm_register_km(struct xfrm_mgr *km); 646 int xfrm_unregister_km(struct xfrm_mgr *km); 647 648 struct xfrm_tunnel_skb_cb { 649 union { 650 struct inet_skb_parm h4; 651 struct inet6_skb_parm h6; 652 } header; 653 654 union { 655 struct ip_tunnel *ip4; 656 struct ip6_tnl *ip6; 657 } tunnel; 658 }; 659 660 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0])) 661 662 /* 663 * This structure is used for the duration where packets are being 664 * transformed by IPsec. As soon as the packet leaves IPsec the 665 * area beyond the generic IP part may be overwritten. 666 */ 667 struct xfrm_skb_cb { 668 struct xfrm_tunnel_skb_cb header; 669 670 /* Sequence number for replay protection. */ 671 union { 672 struct { 673 __u32 low; 674 __u32 hi; 675 } output; 676 struct { 677 __be32 low; 678 __be32 hi; 679 } input; 680 } seq; 681 }; 682 683 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) 684 685 /* 686 * This structure is used by the afinfo prepare_input/prepare_output functions 687 * to transmit header information to the mode input/output functions. 688 */ 689 struct xfrm_mode_skb_cb { 690 struct xfrm_tunnel_skb_cb header; 691 692 /* Copied from header for IPv4, always set to zero and DF for IPv6. */ 693 __be16 id; 694 __be16 frag_off; 695 696 /* IP header length (excluding options or extension headers). */ 697 u8 ihl; 698 699 /* TOS for IPv4, class for IPv6. */ 700 u8 tos; 701 702 /* TTL for IPv4, hop limitfor IPv6. */ 703 u8 ttl; 704 705 /* Protocol for IPv4, NH for IPv6. */ 706 u8 protocol; 707 708 /* Option length for IPv4, zero for IPv6. */ 709 u8 optlen; 710 711 /* Used by IPv6 only, zero for IPv4. */ 712 u8 flow_lbl[3]; 713 }; 714 715 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0])) 716 717 /* 718 * This structure is used by the input processing to locate the SPI and 719 * related information. 720 */ 721 struct xfrm_spi_skb_cb { 722 struct xfrm_tunnel_skb_cb header; 723 724 unsigned int daddroff; 725 unsigned int family; 726 __be32 seq; 727 }; 728 729 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0])) 730 731 #ifdef CONFIG_AUDITSYSCALL 732 static inline struct audit_buffer *xfrm_audit_start(const char *op) 733 { 734 struct audit_buffer *audit_buf = NULL; 735 736 if (audit_enabled == 0) 737 return NULL; 738 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, 739 AUDIT_MAC_IPSEC_EVENT); 740 if (audit_buf == NULL) 741 return NULL; 742 audit_log_format(audit_buf, "op=%s", op); 743 return audit_buf; 744 } 745 746 static inline void xfrm_audit_helper_usrinfo(bool task_valid, 747 struct audit_buffer *audit_buf) 748 { 749 const unsigned int auid = from_kuid(&init_user_ns, task_valid ? 750 audit_get_loginuid(current) : 751 INVALID_UID); 752 const unsigned int ses = task_valid ? audit_get_sessionid(current) : 753 (unsigned int) -1; 754 755 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses); 756 audit_log_task_context(audit_buf); 757 } 758 759 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid); 760 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 761 bool task_valid); 762 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid); 763 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid); 764 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 765 struct sk_buff *skb); 766 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb, 767 __be32 net_seq); 768 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family); 769 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi, 770 __be32 net_seq); 771 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb, 772 u8 proto); 773 #else 774 775 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 776 bool task_valid) 777 { 778 } 779 780 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 781 bool task_valid) 782 { 783 } 784 785 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result, 786 bool task_valid) 787 { 788 } 789 790 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result, 791 bool task_valid) 792 { 793 } 794 795 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 796 struct sk_buff *skb) 797 { 798 } 799 800 static inline void xfrm_audit_state_replay(struct xfrm_state *x, 801 struct sk_buff *skb, __be32 net_seq) 802 { 803 } 804 805 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb, 806 u16 family) 807 { 808 } 809 810 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 811 __be32 net_spi, __be32 net_seq) 812 { 813 } 814 815 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x, 816 struct sk_buff *skb, u8 proto) 817 { 818 } 819 #endif /* CONFIG_AUDITSYSCALL */ 820 821 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 822 { 823 if (likely(policy != NULL)) 824 refcount_inc(&policy->refcnt); 825 } 826 827 void xfrm_policy_destroy(struct xfrm_policy *policy); 828 829 static inline void xfrm_pol_put(struct xfrm_policy *policy) 830 { 831 if (refcount_dec_and_test(&policy->refcnt)) 832 xfrm_policy_destroy(policy); 833 } 834 835 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 836 { 837 int i; 838 for (i = npols - 1; i >= 0; --i) 839 xfrm_pol_put(pols[i]); 840 } 841 842 void __xfrm_state_destroy(struct xfrm_state *); 843 844 static inline void __xfrm_state_put(struct xfrm_state *x) 845 { 846 refcount_dec(&x->refcnt); 847 } 848 849 static inline void xfrm_state_put(struct xfrm_state *x) 850 { 851 if (refcount_dec_and_test(&x->refcnt)) 852 __xfrm_state_destroy(x); 853 } 854 855 static inline void xfrm_state_hold(struct xfrm_state *x) 856 { 857 refcount_inc(&x->refcnt); 858 } 859 860 static inline bool addr_match(const void *token1, const void *token2, 861 unsigned int prefixlen) 862 { 863 const __be32 *a1 = token1; 864 const __be32 *a2 = token2; 865 unsigned int pdw; 866 unsigned int pbi; 867 868 pdw = prefixlen >> 5; /* num of whole u32 in prefix */ 869 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 870 871 if (pdw) 872 if (memcmp(a1, a2, pdw << 2)) 873 return false; 874 875 if (pbi) { 876 __be32 mask; 877 878 mask = htonl((0xffffffff) << (32 - pbi)); 879 880 if ((a1[pdw] ^ a2[pdw]) & mask) 881 return false; 882 } 883 884 return true; 885 } 886 887 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen) 888 { 889 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */ 890 if (sizeof(long) == 4 && prefixlen == 0) 891 return true; 892 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen))); 893 } 894 895 static __inline__ 896 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli) 897 { 898 __be16 port; 899 switch(fl->flowi_proto) { 900 case IPPROTO_TCP: 901 case IPPROTO_UDP: 902 case IPPROTO_UDPLITE: 903 case IPPROTO_SCTP: 904 port = uli->ports.sport; 905 break; 906 case IPPROTO_ICMP: 907 case IPPROTO_ICMPV6: 908 port = htons(uli->icmpt.type); 909 break; 910 case IPPROTO_MH: 911 port = htons(uli->mht.type); 912 break; 913 case IPPROTO_GRE: 914 port = htons(ntohl(uli->gre_key) >> 16); 915 break; 916 default: 917 port = 0; /*XXX*/ 918 } 919 return port; 920 } 921 922 static __inline__ 923 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli) 924 { 925 __be16 port; 926 switch(fl->flowi_proto) { 927 case IPPROTO_TCP: 928 case IPPROTO_UDP: 929 case IPPROTO_UDPLITE: 930 case IPPROTO_SCTP: 931 port = uli->ports.dport; 932 break; 933 case IPPROTO_ICMP: 934 case IPPROTO_ICMPV6: 935 port = htons(uli->icmpt.code); 936 break; 937 case IPPROTO_GRE: 938 port = htons(ntohl(uli->gre_key) & 0xffff); 939 break; 940 default: 941 port = 0; /*XXX*/ 942 } 943 return port; 944 } 945 946 bool xfrm_selector_match(const struct xfrm_selector *sel, 947 const struct flowi *fl, unsigned short family); 948 949 #ifdef CONFIG_SECURITY_NETWORK_XFRM 950 /* If neither has a context --> match 951 * Otherwise, both must have a context and the sids, doi, alg must match 952 */ 953 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 954 { 955 return ((!s1 && !s2) || 956 (s1 && s2 && 957 (s1->ctx_sid == s2->ctx_sid) && 958 (s1->ctx_doi == s2->ctx_doi) && 959 (s1->ctx_alg == s2->ctx_alg))); 960 } 961 #else 962 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 963 { 964 return true; 965 } 966 #endif 967 968 /* A struct encoding bundle of transformations to apply to some set of flow. 969 * 970 * dst->child points to the next element of bundle. 971 * dst->xfrm points to an instanse of transformer. 972 * 973 * Due to unfortunate limitations of current routing cache, which we 974 * have no time to fix, it mirrors struct rtable and bound to the same 975 * routing key, including saddr,daddr. However, we can have many of 976 * bundles differing by session id. All the bundles grow from a parent 977 * policy rule. 978 */ 979 struct xfrm_dst { 980 union { 981 struct dst_entry dst; 982 struct rtable rt; 983 struct rt6_info rt6; 984 } u; 985 struct dst_entry *route; 986 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; 987 int num_pols, num_xfrms; 988 u32 xfrm_genid; 989 u32 policy_genid; 990 u32 route_mtu_cached; 991 u32 child_mtu_cached; 992 u32 route_cookie; 993 u32 path_cookie; 994 }; 995 996 #ifdef CONFIG_XFRM 997 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 998 { 999 xfrm_pols_put(xdst->pols, xdst->num_pols); 1000 dst_release(xdst->route); 1001 if (likely(xdst->u.dst.xfrm)) 1002 xfrm_state_put(xdst->u.dst.xfrm); 1003 } 1004 #endif 1005 1006 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 1007 1008 struct xfrm_offload { 1009 /* Output sequence number for replay protection on offloading. */ 1010 struct { 1011 __u32 low; 1012 __u32 hi; 1013 } seq; 1014 1015 __u32 flags; 1016 #define SA_DELETE_REQ 1 1017 #define CRYPTO_DONE 2 1018 #define CRYPTO_NEXT_DONE 4 1019 #define CRYPTO_FALLBACK 8 1020 #define XFRM_GSO_SEGMENT 16 1021 #define XFRM_GRO 32 1022 #define XFRM_ESP_NO_TRAILER 64 1023 1024 __u32 status; 1025 #define CRYPTO_SUCCESS 1 1026 #define CRYPTO_GENERIC_ERROR 2 1027 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4 1028 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8 1029 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16 1030 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32 1031 #define CRYPTO_INVALID_PACKET_SYNTAX 64 1032 #define CRYPTO_INVALID_PROTOCOL 128 1033 1034 __u8 proto; 1035 }; 1036 1037 struct sec_path { 1038 refcount_t refcnt; 1039 int len; 1040 int olen; 1041 1042 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 1043 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH]; 1044 }; 1045 1046 static inline int secpath_exists(struct sk_buff *skb) 1047 { 1048 #ifdef CONFIG_XFRM 1049 return skb->sp != NULL; 1050 #else 1051 return 0; 1052 #endif 1053 } 1054 1055 static inline struct sec_path * 1056 secpath_get(struct sec_path *sp) 1057 { 1058 if (sp) 1059 refcount_inc(&sp->refcnt); 1060 return sp; 1061 } 1062 1063 void __secpath_destroy(struct sec_path *sp); 1064 1065 static inline void 1066 secpath_put(struct sec_path *sp) 1067 { 1068 if (sp && refcount_dec_and_test(&sp->refcnt)) 1069 __secpath_destroy(sp); 1070 } 1071 1072 struct sec_path *secpath_dup(struct sec_path *src); 1073 int secpath_set(struct sk_buff *skb); 1074 1075 static inline void 1076 secpath_reset(struct sk_buff *skb) 1077 { 1078 #ifdef CONFIG_XFRM 1079 secpath_put(skb->sp); 1080 skb->sp = NULL; 1081 #endif 1082 } 1083 1084 static inline int 1085 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family) 1086 { 1087 switch (family) { 1088 case AF_INET: 1089 return addr->a4 == 0; 1090 case AF_INET6: 1091 return ipv6_addr_any(&addr->in6); 1092 } 1093 return 0; 1094 } 1095 1096 static inline int 1097 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1098 { 1099 return (tmpl->saddr.a4 && 1100 tmpl->saddr.a4 != x->props.saddr.a4); 1101 } 1102 1103 static inline int 1104 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1105 { 1106 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 1107 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 1108 } 1109 1110 static inline int 1111 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family) 1112 { 1113 switch (family) { 1114 case AF_INET: 1115 return __xfrm4_state_addr_cmp(tmpl, x); 1116 case AF_INET6: 1117 return __xfrm6_state_addr_cmp(tmpl, x); 1118 } 1119 return !0; 1120 } 1121 1122 #ifdef CONFIG_XFRM 1123 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, 1124 unsigned short family); 1125 1126 static inline int __xfrm_policy_check2(struct sock *sk, int dir, 1127 struct sk_buff *skb, 1128 unsigned int family, int reverse) 1129 { 1130 struct net *net = dev_net(skb->dev); 1131 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); 1132 1133 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 1134 return __xfrm_policy_check(sk, ndir, skb, family); 1135 1136 return (!net->xfrm.policy_count[dir] && !skb->sp) || 1137 (skb_dst(skb)->flags & DST_NOPOLICY) || 1138 __xfrm_policy_check(sk, ndir, skb, family); 1139 } 1140 1141 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1142 { 1143 return __xfrm_policy_check2(sk, dir, skb, family, 0); 1144 } 1145 1146 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1147 { 1148 return xfrm_policy_check(sk, dir, skb, AF_INET); 1149 } 1150 1151 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1152 { 1153 return xfrm_policy_check(sk, dir, skb, AF_INET6); 1154 } 1155 1156 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1157 struct sk_buff *skb) 1158 { 1159 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); 1160 } 1161 1162 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1163 struct sk_buff *skb) 1164 { 1165 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); 1166 } 1167 1168 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1169 unsigned int family, int reverse); 1170 1171 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1172 unsigned int family) 1173 { 1174 return __xfrm_decode_session(skb, fl, family, 0); 1175 } 1176 1177 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1178 struct flowi *fl, 1179 unsigned int family) 1180 { 1181 return __xfrm_decode_session(skb, fl, family, 1); 1182 } 1183 1184 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 1185 1186 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 1187 { 1188 struct net *net = dev_net(skb->dev); 1189 1190 return !net->xfrm.policy_count[XFRM_POLICY_OUT] || 1191 (skb_dst(skb)->flags & DST_NOXFRM) || 1192 __xfrm_route_forward(skb, family); 1193 } 1194 1195 static inline int xfrm4_route_forward(struct sk_buff *skb) 1196 { 1197 return xfrm_route_forward(skb, AF_INET); 1198 } 1199 1200 static inline int xfrm6_route_forward(struct sk_buff *skb) 1201 { 1202 return xfrm_route_forward(skb, AF_INET6); 1203 } 1204 1205 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk); 1206 1207 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) 1208 { 1209 sk->sk_policy[0] = NULL; 1210 sk->sk_policy[1] = NULL; 1211 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1])) 1212 return __xfrm_sk_clone_policy(sk, osk); 1213 return 0; 1214 } 1215 1216 int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 1217 1218 static inline void xfrm_sk_free_policy(struct sock *sk) 1219 { 1220 struct xfrm_policy *pol; 1221 1222 pol = rcu_dereference_protected(sk->sk_policy[0], 1); 1223 if (unlikely(pol != NULL)) { 1224 xfrm_policy_delete(pol, XFRM_POLICY_MAX); 1225 sk->sk_policy[0] = NULL; 1226 } 1227 pol = rcu_dereference_protected(sk->sk_policy[1], 1); 1228 if (unlikely(pol != NULL)) { 1229 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1); 1230 sk->sk_policy[1] = NULL; 1231 } 1232 } 1233 1234 #else 1235 1236 static inline void xfrm_sk_free_policy(struct sock *sk) {} 1237 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; } 1238 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 1239 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 1240 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1241 { 1242 return 1; 1243 } 1244 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1245 { 1246 return 1; 1247 } 1248 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1249 { 1250 return 1; 1251 } 1252 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1253 struct flowi *fl, 1254 unsigned int family) 1255 { 1256 return -ENOSYS; 1257 } 1258 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1259 struct sk_buff *skb) 1260 { 1261 return 1; 1262 } 1263 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1264 struct sk_buff *skb) 1265 { 1266 return 1; 1267 } 1268 #endif 1269 1270 static __inline__ 1271 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family) 1272 { 1273 switch (family){ 1274 case AF_INET: 1275 return (xfrm_address_t *)&fl->u.ip4.daddr; 1276 case AF_INET6: 1277 return (xfrm_address_t *)&fl->u.ip6.daddr; 1278 } 1279 return NULL; 1280 } 1281 1282 static __inline__ 1283 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family) 1284 { 1285 switch (family){ 1286 case AF_INET: 1287 return (xfrm_address_t *)&fl->u.ip4.saddr; 1288 case AF_INET6: 1289 return (xfrm_address_t *)&fl->u.ip6.saddr; 1290 } 1291 return NULL; 1292 } 1293 1294 static __inline__ 1295 void xfrm_flowi_addr_get(const struct flowi *fl, 1296 xfrm_address_t *saddr, xfrm_address_t *daddr, 1297 unsigned short family) 1298 { 1299 switch(family) { 1300 case AF_INET: 1301 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4)); 1302 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4)); 1303 break; 1304 case AF_INET6: 1305 saddr->in6 = fl->u.ip6.saddr; 1306 daddr->in6 = fl->u.ip6.daddr; 1307 break; 1308 } 1309 } 1310 1311 static __inline__ int 1312 __xfrm4_state_addr_check(const struct xfrm_state *x, 1313 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1314 { 1315 if (daddr->a4 == x->id.daddr.a4 && 1316 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 1317 return 1; 1318 return 0; 1319 } 1320 1321 static __inline__ int 1322 __xfrm6_state_addr_check(const struct xfrm_state *x, 1323 const xfrm_address_t *daddr, const xfrm_address_t *saddr) 1324 { 1325 if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 1326 (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) || 1327 ipv6_addr_any((struct in6_addr *)saddr) || 1328 ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 1329 return 1; 1330 return 0; 1331 } 1332 1333 static __inline__ int 1334 xfrm_state_addr_check(const struct xfrm_state *x, 1335 const xfrm_address_t *daddr, const xfrm_address_t *saddr, 1336 unsigned short family) 1337 { 1338 switch (family) { 1339 case AF_INET: 1340 return __xfrm4_state_addr_check(x, daddr, saddr); 1341 case AF_INET6: 1342 return __xfrm6_state_addr_check(x, daddr, saddr); 1343 } 1344 return 0; 1345 } 1346 1347 static __inline__ int 1348 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl, 1349 unsigned short family) 1350 { 1351 switch (family) { 1352 case AF_INET: 1353 return __xfrm4_state_addr_check(x, 1354 (const xfrm_address_t *)&fl->u.ip4.daddr, 1355 (const xfrm_address_t *)&fl->u.ip4.saddr); 1356 case AF_INET6: 1357 return __xfrm6_state_addr_check(x, 1358 (const xfrm_address_t *)&fl->u.ip6.daddr, 1359 (const xfrm_address_t *)&fl->u.ip6.saddr); 1360 } 1361 return 0; 1362 } 1363 1364 static inline int xfrm_state_kern(const struct xfrm_state *x) 1365 { 1366 return atomic_read(&x->tunnel_users); 1367 } 1368 1369 static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 1370 { 1371 return (!userproto || proto == userproto || 1372 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 1373 proto == IPPROTO_ESP || 1374 proto == IPPROTO_COMP))); 1375 } 1376 1377 /* 1378 * xfrm algorithm information 1379 */ 1380 struct xfrm_algo_aead_info { 1381 char *geniv; 1382 u16 icv_truncbits; 1383 }; 1384 1385 struct xfrm_algo_auth_info { 1386 u16 icv_truncbits; 1387 u16 icv_fullbits; 1388 }; 1389 1390 struct xfrm_algo_encr_info { 1391 char *geniv; 1392 u16 blockbits; 1393 u16 defkeybits; 1394 }; 1395 1396 struct xfrm_algo_comp_info { 1397 u16 threshold; 1398 }; 1399 1400 struct xfrm_algo_desc { 1401 char *name; 1402 char *compat; 1403 u8 available:1; 1404 u8 pfkey_supported:1; 1405 union { 1406 struct xfrm_algo_aead_info aead; 1407 struct xfrm_algo_auth_info auth; 1408 struct xfrm_algo_encr_info encr; 1409 struct xfrm_algo_comp_info comp; 1410 } uinfo; 1411 struct sadb_alg desc; 1412 }; 1413 1414 /* XFRM protocol handlers. */ 1415 struct xfrm4_protocol { 1416 int (*handler)(struct sk_buff *skb); 1417 int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, 1418 int encap_type); 1419 int (*cb_handler)(struct sk_buff *skb, int err); 1420 int (*err_handler)(struct sk_buff *skb, u32 info); 1421 1422 struct xfrm4_protocol __rcu *next; 1423 int priority; 1424 }; 1425 1426 struct xfrm6_protocol { 1427 int (*handler)(struct sk_buff *skb); 1428 int (*cb_handler)(struct sk_buff *skb, int err); 1429 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1430 u8 type, u8 code, int offset, __be32 info); 1431 1432 struct xfrm6_protocol __rcu *next; 1433 int priority; 1434 }; 1435 1436 /* XFRM tunnel handlers. */ 1437 struct xfrm_tunnel { 1438 int (*handler)(struct sk_buff *skb); 1439 int (*err_handler)(struct sk_buff *skb, u32 info); 1440 1441 struct xfrm_tunnel __rcu *next; 1442 int priority; 1443 }; 1444 1445 struct xfrm6_tunnel { 1446 int (*handler)(struct sk_buff *skb); 1447 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 1448 u8 type, u8 code, int offset, __be32 info); 1449 struct xfrm6_tunnel __rcu *next; 1450 int priority; 1451 }; 1452 1453 void xfrm_init(void); 1454 void xfrm4_init(void); 1455 int xfrm_state_init(struct net *net); 1456 void xfrm_state_fini(struct net *net); 1457 void xfrm4_state_init(void); 1458 void xfrm4_protocol_init(void); 1459 #ifdef CONFIG_XFRM 1460 int xfrm6_init(void); 1461 void xfrm6_fini(void); 1462 int xfrm6_state_init(void); 1463 void xfrm6_state_fini(void); 1464 int xfrm6_protocol_init(void); 1465 void xfrm6_protocol_fini(void); 1466 #else 1467 static inline int xfrm6_init(void) 1468 { 1469 return 0; 1470 } 1471 static inline void xfrm6_fini(void) 1472 { 1473 ; 1474 } 1475 #endif 1476 1477 #ifdef CONFIG_XFRM_STATISTICS 1478 int xfrm_proc_init(struct net *net); 1479 void xfrm_proc_fini(struct net *net); 1480 #endif 1481 1482 int xfrm_sysctl_init(struct net *net); 1483 #ifdef CONFIG_SYSCTL 1484 void xfrm_sysctl_fini(struct net *net); 1485 #else 1486 static inline void xfrm_sysctl_fini(struct net *net) 1487 { 1488 } 1489 #endif 1490 1491 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, 1492 struct xfrm_address_filter *filter); 1493 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, 1494 int (*func)(struct xfrm_state *, int, void*), void *); 1495 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net); 1496 struct xfrm_state *xfrm_state_alloc(struct net *net); 1497 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr, 1498 const xfrm_address_t *saddr, 1499 const struct flowi *fl, 1500 struct xfrm_tmpl *tmpl, 1501 struct xfrm_policy *pol, int *err, 1502 unsigned short family); 1503 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, 1504 xfrm_address_t *daddr, 1505 xfrm_address_t *saddr, 1506 unsigned short family, 1507 u8 mode, u8 proto, u32 reqid); 1508 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, 1509 unsigned short family); 1510 int xfrm_state_check_expire(struct xfrm_state *x); 1511 void xfrm_state_insert(struct xfrm_state *x); 1512 int xfrm_state_add(struct xfrm_state *x); 1513 int xfrm_state_update(struct xfrm_state *x); 1514 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark, 1515 const xfrm_address_t *daddr, __be32 spi, 1516 u8 proto, unsigned short family); 1517 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark, 1518 const xfrm_address_t *daddr, 1519 const xfrm_address_t *saddr, 1520 u8 proto, 1521 unsigned short family); 1522 #ifdef CONFIG_XFRM_SUB_POLICY 1523 int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, 1524 unsigned short family, struct net *net); 1525 int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, 1526 unsigned short family); 1527 #else 1528 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, 1529 int n, unsigned short family, struct net *net) 1530 { 1531 return -ENOSYS; 1532 } 1533 1534 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, 1535 int n, unsigned short family) 1536 { 1537 return -ENOSYS; 1538 } 1539 #endif 1540 1541 struct xfrmk_sadinfo { 1542 u32 sadhcnt; /* current hash bkts */ 1543 u32 sadhmcnt; /* max allowed hash bkts */ 1544 u32 sadcnt; /* current running count */ 1545 }; 1546 1547 struct xfrmk_spdinfo { 1548 u32 incnt; 1549 u32 outcnt; 1550 u32 fwdcnt; 1551 u32 inscnt; 1552 u32 outscnt; 1553 u32 fwdscnt; 1554 u32 spdhcnt; 1555 u32 spdhmcnt; 1556 }; 1557 1558 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); 1559 int xfrm_state_delete(struct xfrm_state *x); 1560 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid); 1561 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid); 1562 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); 1563 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); 1564 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq); 1565 int xfrm_init_replay(struct xfrm_state *x); 1566 int xfrm_state_mtu(struct xfrm_state *x, int mtu); 1567 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload); 1568 int xfrm_init_state(struct xfrm_state *x); 1569 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb); 1570 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type); 1571 int xfrm_input_resume(struct sk_buff *skb, int nexthdr); 1572 int xfrm_output_resume(struct sk_buff *skb, int err); 1573 int xfrm_output(struct sock *sk, struct sk_buff *skb); 1574 int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1575 void xfrm_local_error(struct sk_buff *skb, int mtu); 1576 int xfrm4_extract_header(struct sk_buff *skb); 1577 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1578 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, 1579 int encap_type); 1580 int xfrm4_transport_finish(struct sk_buff *skb, int async); 1581 int xfrm4_rcv(struct sk_buff *skb); 1582 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1583 1584 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) 1585 { 1586 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL; 1587 XFRM_SPI_SKB_CB(skb)->family = AF_INET; 1588 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); 1589 return xfrm_input(skb, nexthdr, spi, 0); 1590 } 1591 1592 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1593 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb); 1594 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1595 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb); 1596 int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err); 1597 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol); 1598 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol); 1599 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); 1600 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 1601 void xfrm4_local_error(struct sk_buff *skb, u32 mtu); 1602 int xfrm6_extract_header(struct sk_buff *skb); 1603 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); 1604 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi, 1605 struct ip6_tnl *t); 1606 int xfrm6_transport_finish(struct sk_buff *skb, int async); 1607 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t); 1608 int xfrm6_rcv(struct sk_buff *skb); 1609 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, 1610 xfrm_address_t *saddr, u8 proto); 1611 void xfrm6_local_error(struct sk_buff *skb, u32 mtu); 1612 int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err); 1613 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol); 1614 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol); 1615 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); 1616 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); 1617 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr); 1618 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr); 1619 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb); 1620 int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb); 1621 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb); 1622 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb); 1623 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, 1624 u8 **prevhdr); 1625 1626 #ifdef CONFIG_XFRM 1627 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); 1628 int xfrm_user_policy(struct sock *sk, int optname, 1629 u8 __user *optval, int optlen); 1630 #else 1631 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 1632 { 1633 return -ENOPROTOOPT; 1634 } 1635 1636 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb) 1637 { 1638 /* should not happen */ 1639 kfree_skb(skb); 1640 return 0; 1641 } 1642 #endif 1643 1644 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif, 1645 const xfrm_address_t *saddr, 1646 const xfrm_address_t *daddr, 1647 int family, u32 mark); 1648 1649 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); 1650 1651 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); 1652 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, 1653 int (*func)(struct xfrm_policy *, int, int, void*), 1654 void *); 1655 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net); 1656 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 1657 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, 1658 u8 type, int dir, 1659 struct xfrm_selector *sel, 1660 struct xfrm_sec_ctx *ctx, int delete, 1661 int *err); 1662 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, 1663 u32 id, int delete, int *err); 1664 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid); 1665 void xfrm_policy_hash_rebuild(struct net *net); 1666 u32 xfrm_get_acqseq(void); 1667 int verify_spi_info(u8 proto, u32 min, u32 max); 1668 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 1669 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, 1670 u8 mode, u32 reqid, u8 proto, 1671 const xfrm_address_t *daddr, 1672 const xfrm_address_t *saddr, int create, 1673 unsigned short family); 1674 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 1675 1676 #ifdef CONFIG_XFRM_MIGRATE 1677 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1678 const struct xfrm_migrate *m, int num_bundles, 1679 const struct xfrm_kmaddress *k, 1680 const struct xfrm_encap_tmpl *encap); 1681 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net); 1682 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, 1683 struct xfrm_migrate *m, 1684 struct xfrm_encap_tmpl *encap); 1685 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 1686 struct xfrm_migrate *m, int num_bundles, 1687 struct xfrm_kmaddress *k, struct net *net, 1688 struct xfrm_encap_tmpl *encap); 1689 #endif 1690 1691 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 1692 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid); 1693 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, 1694 xfrm_address_t *addr); 1695 1696 void xfrm_input_init(void); 1697 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); 1698 1699 void xfrm_probe_algs(void); 1700 int xfrm_count_pfkey_auth_supported(void); 1701 int xfrm_count_pfkey_enc_supported(void); 1702 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 1703 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 1704 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 1705 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 1706 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 1707 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe); 1708 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe); 1709 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe); 1710 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, 1711 int probe); 1712 1713 static inline bool xfrm6_addr_equal(const xfrm_address_t *a, 1714 const xfrm_address_t *b) 1715 { 1716 return ipv6_addr_equal((const struct in6_addr *)a, 1717 (const struct in6_addr *)b); 1718 } 1719 1720 static inline bool xfrm_addr_equal(const xfrm_address_t *a, 1721 const xfrm_address_t *b, 1722 sa_family_t family) 1723 { 1724 switch (family) { 1725 default: 1726 case AF_INET: 1727 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0; 1728 case AF_INET6: 1729 return xfrm6_addr_equal(a, b); 1730 } 1731 } 1732 1733 static inline int xfrm_policy_id2dir(u32 index) 1734 { 1735 return index & 7; 1736 } 1737 1738 #ifdef CONFIG_XFRM 1739 static inline int xfrm_aevent_is_on(struct net *net) 1740 { 1741 struct sock *nlsk; 1742 int ret = 0; 1743 1744 rcu_read_lock(); 1745 nlsk = rcu_dereference(net->xfrm.nlsk); 1746 if (nlsk) 1747 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1748 rcu_read_unlock(); 1749 return ret; 1750 } 1751 1752 static inline int xfrm_acquire_is_on(struct net *net) 1753 { 1754 struct sock *nlsk; 1755 int ret = 0; 1756 1757 rcu_read_lock(); 1758 nlsk = rcu_dereference(net->xfrm.nlsk); 1759 if (nlsk) 1760 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE); 1761 rcu_read_unlock(); 1762 1763 return ret; 1764 } 1765 #endif 1766 1767 static inline int aead_len(struct xfrm_algo_aead *alg) 1768 { 1769 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1770 } 1771 1772 static inline int xfrm_alg_len(const struct xfrm_algo *alg) 1773 { 1774 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1775 } 1776 1777 static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg) 1778 { 1779 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); 1780 } 1781 1782 static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn) 1783 { 1784 return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32); 1785 } 1786 1787 #ifdef CONFIG_XFRM_MIGRATE 1788 static inline int xfrm_replay_clone(struct xfrm_state *x, 1789 struct xfrm_state *orig) 1790 { 1791 x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn), 1792 GFP_KERNEL); 1793 if (!x->replay_esn) 1794 return -ENOMEM; 1795 1796 x->replay_esn->bmp_len = orig->replay_esn->bmp_len; 1797 x->replay_esn->replay_window = orig->replay_esn->replay_window; 1798 1799 x->preplay_esn = kmemdup(x->replay_esn, 1800 xfrm_replay_state_esn_len(x->replay_esn), 1801 GFP_KERNEL); 1802 if (!x->preplay_esn) { 1803 kfree(x->replay_esn); 1804 return -ENOMEM; 1805 } 1806 1807 return 0; 1808 } 1809 1810 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig) 1811 { 1812 return kmemdup(orig, aead_len(orig), GFP_KERNEL); 1813 } 1814 1815 1816 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) 1817 { 1818 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); 1819 } 1820 1821 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig) 1822 { 1823 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL); 1824 } 1825 1826 static inline void xfrm_states_put(struct xfrm_state **states, int n) 1827 { 1828 int i; 1829 for (i = 0; i < n; i++) 1830 xfrm_state_put(*(states + i)); 1831 } 1832 1833 static inline void xfrm_states_delete(struct xfrm_state **states, int n) 1834 { 1835 int i; 1836 for (i = 0; i < n; i++) 1837 xfrm_state_delete(*(states + i)); 1838 } 1839 #endif 1840 1841 #ifdef CONFIG_XFRM 1842 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) 1843 { 1844 return skb->sp->xvec[skb->sp->len - 1]; 1845 } 1846 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb) 1847 { 1848 struct sec_path *sp = skb->sp; 1849 1850 if (!sp || !sp->olen || sp->len != sp->olen) 1851 return NULL; 1852 1853 return &sp->ovec[sp->olen - 1]; 1854 } 1855 #endif 1856 1857 void __net_init xfrm_dev_init(void); 1858 1859 #ifdef CONFIG_XFRM_OFFLOAD 1860 int validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features); 1861 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, 1862 struct xfrm_user_offload *xuo); 1863 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x); 1864 1865 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 1866 { 1867 struct xfrm_state *x = dst->xfrm; 1868 1869 if (!x || !x->type_offload) 1870 return false; 1871 1872 if (x->xso.offload_handle && (x->xso.dev == dst->path->dev) && 1873 !dst->child->xfrm) 1874 return true; 1875 1876 return false; 1877 } 1878 1879 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 1880 { 1881 struct xfrm_state_offload *xso = &x->xso; 1882 1883 if (xso->dev) 1884 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x); 1885 } 1886 1887 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1888 { 1889 struct xfrm_state_offload *xso = &x->xso; 1890 struct net_device *dev = xso->dev; 1891 1892 if (dev && dev->xfrmdev_ops) { 1893 dev->xfrmdev_ops->xdo_dev_state_free(x); 1894 xso->dev = NULL; 1895 dev_put(dev); 1896 } 1897 } 1898 #else 1899 static inline int validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features) 1900 { 1901 return 0; 1902 } 1903 1904 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo) 1905 { 1906 return 0; 1907 } 1908 1909 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 1910 { 1911 } 1912 1913 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1914 { 1915 } 1916 1917 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) 1918 { 1919 return false; 1920 } 1921 1922 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) 1923 { 1924 return false; 1925 } 1926 #endif 1927 1928 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) 1929 { 1930 if (attrs[XFRMA_MARK]) 1931 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark)); 1932 else 1933 m->v = m->m = 0; 1934 1935 return m->v & m->m; 1936 } 1937 1938 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m) 1939 { 1940 int ret = 0; 1941 1942 if (m->m | m->v) 1943 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); 1944 return ret; 1945 } 1946 1947 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x, 1948 unsigned int family) 1949 { 1950 bool tunnel = false; 1951 1952 switch(family) { 1953 case AF_INET: 1954 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) 1955 tunnel = true; 1956 break; 1957 case AF_INET6: 1958 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) 1959 tunnel = true; 1960 break; 1961 } 1962 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL)) 1963 return -EINVAL; 1964 1965 return 0; 1966 } 1967 #endif /* _NET_XFRM_H */ 1968