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 17 #include <net/sock.h> 18 #include <net/dst.h> 19 #include <net/ip.h> 20 #include <net/route.h> 21 #include <net/ipv6.h> 22 #include <net/ip6_fib.h> 23 #include <net/flow.h> 24 25 #include <linux/interrupt.h> 26 27 #ifdef CONFIG_XFRM_STATISTICS 28 #include <net/snmp.h> 29 #endif 30 31 #define XFRM_PROTO_ESP 50 32 #define XFRM_PROTO_AH 51 33 #define XFRM_PROTO_COMP 108 34 #define XFRM_PROTO_IPIP 4 35 #define XFRM_PROTO_IPV6 41 36 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING 37 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS 38 39 #define XFRM_ALIGN4(len) (((len) + 3) & ~3) 40 #define XFRM_ALIGN8(len) (((len) + 7) & ~7) 41 #define MODULE_ALIAS_XFRM_MODE(family, encap) \ 42 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap)) 43 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \ 44 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto)) 45 46 #ifdef CONFIG_XFRM_STATISTICS 47 #define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field) 48 #else 49 #define XFRM_INC_STATS(net, field) ((void)(net)) 50 #endif 51 52 53 /* Organization of SPD aka "XFRM rules" 54 ------------------------------------ 55 56 Basic objects: 57 - policy rule, struct xfrm_policy (=SPD entry) 58 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) 59 - instance of a transformer, struct xfrm_state (=SA) 60 - template to clone xfrm_state, struct xfrm_tmpl 61 62 SPD is plain linear list of xfrm_policy rules, ordered by priority. 63 (To be compatible with existing pfkeyv2 implementations, 64 many rules with priority of 0x7fffffff are allowed to exist and 65 such rules are ordered in an unpredictable way, thanks to bsd folks.) 66 67 Lookup is plain linear search until the first match with selector. 68 69 If "action" is "block", then we prohibit the flow, otherwise: 70 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, 71 policy entry has list of up to XFRM_MAX_DEPTH transformations, 72 described by templates xfrm_tmpl. Each template is resolved 73 to a complete xfrm_state (see below) and we pack bundle of transformations 74 to a dst_entry returned to requestor. 75 76 dst -. xfrm .-> xfrm_state #1 77 |---. child .-> dst -. xfrm .-> xfrm_state #2 78 |---. child .-> dst -. xfrm .-> xfrm_state #3 79 |---. child .-> NULL 80 81 Bundles are cached at xrfm_policy struct (field ->bundles). 82 83 84 Resolution of xrfm_tmpl 85 ----------------------- 86 Template contains: 87 1. ->mode Mode: transport or tunnel 88 2. ->id.proto Protocol: AH/ESP/IPCOMP 89 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. 90 Q: allow to resolve security gateway? 91 4. ->id.spi If not zero, static SPI. 92 5. ->saddr Local tunnel endpoint, ignored for transport mode. 93 6. ->algos List of allowed algos. Plain bitmask now. 94 Q: ealgos, aalgos, calgos. What a mess... 95 7. ->share Sharing mode. 96 Q: how to implement private sharing mode? To add struct sock* to 97 flow id? 98 99 Having this template we search through SAD searching for entries 100 with appropriate mode/proto/algo, permitted by selector. 101 If no appropriate entry found, it is requested from key manager. 102 103 PROBLEMS: 104 Q: How to find all the bundles referring to a physical path for 105 PMTU discovery? Seems, dst should contain list of all parents... 106 and enter to infinite locking hierarchy disaster. 107 No! It is easier, we will not search for them, let them find us. 108 We add genid to each dst plus pointer to genid of raw IP route, 109 pmtu disc will update pmtu on raw IP route and increase its genid. 110 dst_check() will see this for top level and trigger resyncing 111 metrics. Plus, it will be made via sk->sk_dst_cache. Solved. 112 */ 113 114 struct xfrm_state_walk { 115 struct list_head all; 116 u8 state; 117 u8 dying; 118 u8 proto; 119 u32 seq; 120 struct xfrm_address_filter *filter; 121 }; 122 123 struct xfrm_state_offload { 124 struct net_device *dev; 125 unsigned long offload_handle; 126 unsigned int num_exthdrs; 127 u8 flags; 128 }; 129 130 /* Full description of state of transformer. */ 131 struct xfrm_state { 132 possible_net_t xs_net; 133 union { 134 struct hlist_node gclist; 135 struct hlist_node bydst; 136 }; 137 struct hlist_node bysrc; 138 struct hlist_node byspi; 139 140 atomic_t refcnt; 141 spinlock_t lock; 142 143 struct xfrm_id id; 144 struct xfrm_selector sel; 145 struct xfrm_mark mark; 146 u32 tfcpad; 147 148 u32 genid; 149 150 /* Key manager bits */ 151 struct xfrm_state_walk km; 152 153 /* Parameters of this state. */ 154 struct { 155 u32 reqid; 156 u8 mode; 157 u8 replay_window; 158 u8 aalgo, ealgo, calgo; 159 u8 flags; 160 u16 family; 161 xfrm_address_t saddr; 162 int header_len; 163 int trailer_len; 164 u32 extra_flags; 165 } props; 166 167 struct xfrm_lifetime_cfg lft; 168 169 /* Data for transformer */ 170 struct xfrm_algo_auth *aalg; 171 struct xfrm_algo *ealg; 172 struct xfrm_algo *calg; 173 struct xfrm_algo_aead *aead; 174 const char *geniv; 175 176 /* Data for encapsulator */ 177 struct xfrm_encap_tmpl *encap; 178 179 /* Data for care-of address */ 180 xfrm_address_t *coaddr; 181 182 /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 183 struct xfrm_state *tunnel; 184 185 /* If a tunnel, number of users + 1 */ 186 atomic_t tunnel_users; 187 188 /* State for replay detection */ 189 struct xfrm_replay_state replay; 190 struct xfrm_replay_state_esn *replay_esn; 191 192 /* Replay detection state at the time we sent the last notification */ 193 struct xfrm_replay_state preplay; 194 struct xfrm_replay_state_esn *preplay_esn; 195 196 /* The functions for replay detection. */ 197 const struct xfrm_replay *repl; 198 199 /* internal flag that only holds state for delayed aevent at the 200 * moment 201 */ 202 u32 xflags; 203 204 /* Replay detection notification settings */ 205 u32 replay_maxage; 206 u32 replay_maxdiff; 207 208 /* Replay detection notification timer */ 209 struct timer_list rtimer; 210 211 /* Statistics */ 212 struct xfrm_stats stats; 213 214 struct xfrm_lifetime_cur curlft; 215 struct tasklet_hrtimer mtimer; 216 217 struct xfrm_state_offload xso; 218 219 /* used to fix curlft->add_time when changing date */ 220 long saved_tmo; 221 222 /* Last used time */ 223 unsigned long lastused; 224 225 struct page_frag xfrag; 226 227 /* Reference to data common to all the instances of this 228 * transformer. */ 229 const struct xfrm_type *type; 230 struct xfrm_mode *inner_mode; 231 struct xfrm_mode *inner_mode_iaf; 232 struct xfrm_mode *outer_mode; 233 234 const struct xfrm_type_offload *type_offload; 235 236 /* Security context */ 237 struct xfrm_sec_ctx *security; 238 239 /* Private data of this transformer, format is opaque, 240 * interpreted by xfrm_type methods. */ 241 void *data; 242 }; 243 244 static inline struct net *xs_net(struct xfrm_state *x) 245 { 246 return read_pnet(&x->xs_net); 247 } 248 249 /* xflags - make enum if more show up */ 250 #define XFRM_TIME_DEFER 1 251 #define XFRM_SOFT_EXPIRE 2 252 253 enum { 254 XFRM_STATE_VOID, 255 XFRM_STATE_ACQ, 256 XFRM_STATE_VALID, 257 XFRM_STATE_ERROR, 258 XFRM_STATE_EXPIRED, 259 XFRM_STATE_DEAD 260 }; 261 262 /* callback structure passed from either netlink or pfkey */ 263 struct km_event { 264 union { 265 u32 hard; 266 u32 proto; 267 u32 byid; 268 u32 aevent; 269 u32 type; 270 } data; 271 272 u32 seq; 273 u32 portid; 274 u32 event; 275 struct net *net; 276 }; 277 278 struct xfrm_replay { 279 void (*advance)(struct xfrm_state *x, __be32 net_seq); 280 int (*check)(struct xfrm_state *x, 281 struct sk_buff *skb, 282 __be32 net_seq); 283 int (*recheck)(struct xfrm_state *x, 284 struct sk_buff *skb, 285 __be32 net_seq); 286 void (*notify)(struct xfrm_state *x, int event); 287 int (*overflow)(struct xfrm_state *x, struct sk_buff *skb); 288 }; 289 290 struct net_device; 291 struct xfrm_type; 292 struct xfrm_dst; 293 struct xfrm_policy_afinfo { 294 struct dst_ops *dst_ops; 295 struct dst_entry *(*dst_lookup)(struct net *net, 296 int tos, int oif, 297 const xfrm_address_t *saddr, 298 const xfrm_address_t *daddr); 299 int (*get_saddr)(struct net *net, int oif, 300 xfrm_address_t *saddr, 301 xfrm_address_t *daddr); 302 void (*decode_session)(struct sk_buff *skb, 303 struct flowi *fl, 304 int reverse); 305 int (*get_tos)(const struct flowi *fl); 306 int (*init_path)(struct xfrm_dst *path, 307 struct dst_entry *dst, 308 int nfheader_len); 309 int (*fill_dst)(struct xfrm_dst *xdst, 310 struct net_device *dev, 311 const struct flowi *fl); 312 struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig); 313 }; 314 315 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family); 316 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo); 317 void km_policy_notify(struct xfrm_policy *xp, int dir, 318 const struct km_event *c); 319 void km_state_notify(struct xfrm_state *x, const struct km_event *c); 320 321 struct xfrm_tmpl; 322 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, 323 struct xfrm_policy *pol); 324 void km_state_expired(struct xfrm_state *x, int hard, u32 portid); 325 int __xfrm_state_delete(struct xfrm_state *x); 326 327 struct xfrm_state_afinfo { 328 unsigned int family; 329 unsigned int proto; 330 __be16 eth_proto; 331 struct module *owner; 332 const struct xfrm_type *type_map[IPPROTO_MAX]; 333 const struct xfrm_type_offload *type_offload_map[IPPROTO_MAX]; 334 struct xfrm_mode *mode_map[XFRM_MODE_MAX]; 335 336 int (*init_flags)(struct xfrm_state *x); 337 void (*init_tempsel)(struct xfrm_selector *sel, 338 const struct flowi *fl); 339 void (*init_temprop)(struct xfrm_state *x, 340 const struct xfrm_tmpl *tmpl, 341 const xfrm_address_t *daddr, 342 const xfrm_address_t *saddr); 343 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n); 344 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n); 345 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb); 346 int (*output_finish)(struct sock *sk, struct sk_buff *skb); 347 int (*extract_input)(struct xfrm_state *x, 348 struct sk_buff *skb); 349 int (*extract_output)(struct xfrm_state *x, 350 struct sk_buff *skb); 351 int (*transport_finish)(struct sk_buff *skb, 352 int async); 353 void (*local_error)(struct sk_buff *skb, u32 mtu); 354 }; 355 356 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 357 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 358 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); 359 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family); 360 361 struct xfrm_input_afinfo { 362 unsigned int family; 363 int (*callback)(struct sk_buff *skb, u8 protocol, 364 int err); 365 }; 366 367 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo); 368 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo); 369 370 void xfrm_state_delete_tunnel(struct xfrm_state *x); 371 372 struct xfrm_type { 373 char *description; 374 struct module *owner; 375 u8 proto; 376 u8 flags; 377 #define XFRM_TYPE_NON_FRAGMENT 1 378 #define XFRM_TYPE_REPLAY_PROT 2 379 #define XFRM_TYPE_LOCAL_COADDR 4 380 #define XFRM_TYPE_REMOTE_COADDR 8 381 382 int (*init_state)(struct xfrm_state *x); 383 void (*destructor)(struct xfrm_state *); 384 int (*input)(struct xfrm_state *, struct sk_buff *skb); 385 int (*output)(struct xfrm_state *, struct sk_buff *pskb); 386 int (*reject)(struct xfrm_state *, struct sk_buff *, 387 const struct flowi *); 388 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **); 389 /* Estimate maximal size of result of transformation of a dgram */ 390 u32 (*get_mtu)(struct xfrm_state *, int size); 391 }; 392 393 int xfrm_register_type(const struct xfrm_type *type, unsigned short family); 394 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); 395 396 struct xfrm_type_offload { 397 char *description; 398 struct module *owner; 399 u8 proto; 400 void (*encap)(struct xfrm_state *, struct sk_buff *pskb); 401 int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb); 402 int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features); 403 }; 404 405 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family); 406 int xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family); 407 408 struct xfrm_mode { 409 /* 410 * Remove encapsulation header. 411 * 412 * The IP header will be moved over the top of the encapsulation 413 * header. 414 * 415 * On entry, the transport header shall point to where the IP header 416 * should be and the network header shall be set to where the IP 417 * header currently is. skb->data shall point to the start of the 418 * payload. 419 */ 420 int (*input2)(struct xfrm_state *x, struct sk_buff *skb); 421 422 /* 423 * This is the actual input entry point. 424 * 425 * For transport mode and equivalent this would be identical to 426 * input2 (which does not need to be set). While tunnel mode 427 * and equivalent would set this to the tunnel encapsulation function 428 * xfrm4_prepare_input that would in turn call input2. 429 */ 430 int (*input)(struct xfrm_state *x, struct sk_buff *skb); 431 432 /* 433 * Add encapsulation header. 434 * 435 * On exit, the transport header will be set to the start of the 436 * encapsulation header to be filled in by x->type->output and 437 * the mac header will be set to the nextheader (protocol for 438 * IPv4) field of the extension header directly preceding the 439 * encapsulation header, or in its absence, that of the top IP 440 * header. The value of the network header will always point 441 * to the top IP header while skb->data will point to the payload. 442 */ 443 int (*output2)(struct xfrm_state *x,struct sk_buff *skb); 444 445 /* 446 * This is the actual output entry point. 447 * 448 * For transport mode and equivalent this would be identical to 449 * output2 (which does not need to be set). While tunnel mode 450 * and equivalent would set this to a tunnel encapsulation function 451 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn 452 * call output2. 453 */ 454 int (*output)(struct xfrm_state *x, struct sk_buff *skb); 455 456 /* 457 * Adjust pointers into the packet and do GSO segmentation. 458 */ 459 struct sk_buff *(*gso_segment)(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features); 460 461 /* 462 * Adjust pointers into the packet when IPsec is done at layer2. 463 */ 464 void (*xmit)(struct xfrm_state *x, struct sk_buff *skb); 465 466 struct xfrm_state_afinfo *afinfo; 467 struct module *owner; 468 unsigned int encap; 469 int flags; 470 }; 471 472 /* Flags for xfrm_mode. */ 473 enum { 474 XFRM_MODE_FLAG_TUNNEL = 1, 475 }; 476 477 int xfrm_register_mode(struct xfrm_mode *mode, int family); 478 int xfrm_unregister_mode(struct xfrm_mode *mode, int family); 479 480 static inline int xfrm_af2proto(unsigned int family) 481 { 482 switch(family) { 483 case AF_INET: 484 return IPPROTO_IPIP; 485 case AF_INET6: 486 return IPPROTO_IPV6; 487 default: 488 return 0; 489 } 490 } 491 492 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto) 493 { 494 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) || 495 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6)) 496 return x->inner_mode; 497 else 498 return x->inner_mode_iaf; 499 } 500 501 struct xfrm_tmpl { 502 /* id in template is interpreted as: 503 * daddr - destination of tunnel, may be zero for transport mode. 504 * spi - zero to acquire spi. Not zero if spi is static, then 505 * daddr must be fixed too. 506 * proto - AH/ESP/IPCOMP 507 */ 508 struct xfrm_id id; 509 510 /* Source address of tunnel. Ignored, if it is not a tunnel. */ 511 xfrm_address_t saddr; 512 513 unsigned short encap_family; 514 515 u32 reqid; 516 517 /* Mode: transport, tunnel etc. */ 518 u8 mode; 519 520 /* Sharing mode: unique, this session only, this user only etc. */ 521 u8 share; 522 523 /* May skip this transfomration if no SA is found */ 524 u8 optional; 525 526 /* Skip aalgos/ealgos/calgos checks. */ 527 u8 allalgs; 528 529 /* Bit mask of algos allowed for acquisition */ 530 u32 aalgos; 531 u32 ealgos; 532 u32 calgos; 533 }; 534 535 #define XFRM_MAX_DEPTH 6 536 #define XFRM_MAX_OFFLOAD_DEPTH 1 537 538 struct xfrm_policy_walk_entry { 539 struct list_head all; 540 u8 dead; 541 }; 542 543 struct xfrm_policy_walk { 544 struct xfrm_policy_walk_entry walk; 545 u8 type; 546 u32 seq; 547 }; 548 549 struct xfrm_policy_queue { 550 struct sk_buff_head hold_queue; 551 struct timer_list hold_timer; 552 unsigned long timeout; 553 }; 554 555 struct xfrm_policy { 556 possible_net_t xp_net; 557 struct hlist_node bydst; 558 struct hlist_node byidx; 559 560 /* This lock only affects elements except for entry. */ 561 rwlock_t lock; 562 atomic_t refcnt; 563 struct timer_list timer; 564 565 struct flow_cache_object flo; 566 atomic_t genid; 567 u32 priority; 568 u32 index; 569 struct xfrm_mark mark; 570 struct xfrm_selector selector; 571 struct xfrm_lifetime_cfg lft; 572 struct xfrm_lifetime_cur curlft; 573 struct xfrm_policy_walk_entry walk; 574 struct xfrm_policy_queue polq; 575 u8 type; 576 u8 action; 577 u8 flags; 578 u8 xfrm_nr; 579 u16 family; 580 struct xfrm_sec_ctx *security; 581 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 582 struct rcu_head rcu; 583 }; 584 585 static inline struct net *xp_net(const struct xfrm_policy *xp) 586 { 587 return read_pnet(&xp->xp_net); 588 } 589 590 struct xfrm_kmaddress { 591 xfrm_address_t local; 592 xfrm_address_t remote; 593 u32 reserved; 594 u16 family; 595 }; 596 597 struct xfrm_migrate { 598 xfrm_address_t old_daddr; 599 xfrm_address_t old_saddr; 600 xfrm_address_t new_daddr; 601 xfrm_address_t new_saddr; 602 u8 proto; 603 u8 mode; 604 u16 reserved; 605 u32 reqid; 606 u16 old_family; 607 u16 new_family; 608 }; 609 610 #define XFRM_KM_TIMEOUT 30 611 /* what happened */ 612 #define XFRM_REPLAY_UPDATE XFRM_AE_CR 613 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 614 615 /* default aevent timeout in units of 100ms */ 616 #define XFRM_AE_ETIME 10 617 /* Async Event timer multiplier */ 618 #define XFRM_AE_ETH_M 10 619 /* default seq threshold size */ 620 #define XFRM_AE_SEQT_SIZE 2 621 622 struct xfrm_mgr { 623 struct list_head list; 624 int (*notify)(struct xfrm_state *x, const struct km_event *c); 625 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp); 626 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 627 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); 628 int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c); 629 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); 630 int (*migrate)(const struct xfrm_selector *sel, 631 u8 dir, u8 type, 632 const struct xfrm_migrate *m, 633 int num_bundles, 634 const struct xfrm_kmaddress *k, 635 const struct xfrm_encap_tmpl *encap); 636 bool (*is_alive)(const struct km_event *c); 637 }; 638 639 int xfrm_register_km(struct xfrm_mgr *km); 640 int xfrm_unregister_km(struct xfrm_mgr *km); 641 642 struct xfrm_tunnel_skb_cb { 643 union { 644 struct inet_skb_parm h4; 645 struct inet6_skb_parm h6; 646 } header; 647 648 union { 649 struct ip_tunnel *ip4; 650 struct ip6_tnl *ip6; 651 } tunnel; 652 }; 653 654 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0])) 655 656 /* 657 * This structure is used for the duration where packets are being 658 * transformed by IPsec. As soon as the packet leaves IPsec the 659 * area beyond the generic IP part may be overwritten. 660 */ 661 struct xfrm_skb_cb { 662 struct xfrm_tunnel_skb_cb header; 663 664 /* Sequence number for replay protection. */ 665 union { 666 struct { 667 __u32 low; 668 __u32 hi; 669 } output; 670 struct { 671 __be32 low; 672 __be32 hi; 673 } input; 674 } seq; 675 }; 676 677 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) 678 679 /* 680 * This structure is used by the afinfo prepare_input/prepare_output functions 681 * to transmit header information to the mode input/output functions. 682 */ 683 struct xfrm_mode_skb_cb { 684 struct xfrm_tunnel_skb_cb header; 685 686 /* Copied from header for IPv4, always set to zero and DF for IPv6. */ 687 __be16 id; 688 __be16 frag_off; 689 690 /* IP header length (excluding options or extension headers). */ 691 u8 ihl; 692 693 /* TOS for IPv4, class for IPv6. */ 694 u8 tos; 695 696 /* TTL for IPv4, hop limitfor IPv6. */ 697 u8 ttl; 698 699 /* Protocol for IPv4, NH for IPv6. */ 700 u8 protocol; 701 702 /* Option length for IPv4, zero for IPv6. */ 703 u8 optlen; 704 705 /* Used by IPv6 only, zero for IPv4. */ 706 u8 flow_lbl[3]; 707 }; 708 709 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0])) 710 711 /* 712 * This structure is used by the input processing to locate the SPI and 713 * related information. 714 */ 715 struct xfrm_spi_skb_cb { 716 struct xfrm_tunnel_skb_cb header; 717 718 unsigned int daddroff; 719 unsigned int family; 720 __be32 seq; 721 }; 722 723 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0])) 724 725 #ifdef CONFIG_AUDITSYSCALL 726 static inline struct audit_buffer *xfrm_audit_start(const char *op) 727 { 728 struct audit_buffer *audit_buf = NULL; 729 730 if (audit_enabled == 0) 731 return NULL; 732 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, 733 AUDIT_MAC_IPSEC_EVENT); 734 if (audit_buf == NULL) 735 return NULL; 736 audit_log_format(audit_buf, "op=%s", op); 737 return audit_buf; 738 } 739 740 static inline void xfrm_audit_helper_usrinfo(bool task_valid, 741 struct audit_buffer *audit_buf) 742 { 743 const unsigned int auid = from_kuid(&init_user_ns, task_valid ? 744 audit_get_loginuid(current) : 745 INVALID_UID); 746 const unsigned int ses = task_valid ? audit_get_sessionid(current) : 747 (unsigned int) -1; 748 749 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses); 750 audit_log_task_context(audit_buf); 751 } 752 753 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid); 754 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 755 bool task_valid); 756 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid); 757 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid); 758 void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 759 struct sk_buff *skb); 760 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb, 761 __be32 net_seq); 762 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family); 763 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi, 764 __be32 net_seq); 765 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb, 766 u8 proto); 767 #else 768 769 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, 770 bool task_valid) 771 { 772 } 773 774 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, 775 bool task_valid) 776 { 777 } 778 779 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result, 780 bool task_valid) 781 { 782 } 783 784 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result, 785 bool task_valid) 786 { 787 } 788 789 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x, 790 struct sk_buff *skb) 791 { 792 } 793 794 static inline void xfrm_audit_state_replay(struct xfrm_state *x, 795 struct sk_buff *skb, __be32 net_seq) 796 { 797 } 798 799 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb, 800 u16 family) 801 { 802 } 803 804 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, 805 __be32 net_spi, __be32 net_seq) 806 { 807 } 808 809 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x, 810 struct sk_buff *skb, u8 proto) 811 { 812 } 813 #endif /* CONFIG_AUDITSYSCALL */ 814 815 static inline void xfrm_pol_hold(struct xfrm_policy *policy) 816 { 817 if (likely(policy != NULL)) 818 atomic_inc(&policy->refcnt); 819 } 820 821 void xfrm_policy_destroy(struct xfrm_policy *policy); 822 823 static inline void xfrm_pol_put(struct xfrm_policy *policy) 824 { 825 if (atomic_dec_and_test(&policy->refcnt)) 826 xfrm_policy_destroy(policy); 827 } 828 829 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) 830 { 831 int i; 832 for (i = npols - 1; i >= 0; --i) 833 xfrm_pol_put(pols[i]); 834 } 835 836 void __xfrm_state_destroy(struct xfrm_state *); 837 838 static inline void __xfrm_state_put(struct xfrm_state *x) 839 { 840 atomic_dec(&x->refcnt); 841 } 842 843 static inline void xfrm_state_put(struct xfrm_state *x) 844 { 845 if (atomic_dec_and_test(&x->refcnt)) 846 __xfrm_state_destroy(x); 847 } 848 849 static inline void xfrm_state_hold(struct xfrm_state *x) 850 { 851 atomic_inc(&x->refcnt); 852 } 853 854 static inline bool addr_match(const void *token1, const void *token2, 855 unsigned int prefixlen) 856 { 857 const __be32 *a1 = token1; 858 const __be32 *a2 = token2; 859 unsigned int pdw; 860 unsigned int pbi; 861 862 pdw = prefixlen >> 5; /* num of whole u32 in prefix */ 863 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 864 865 if (pdw) 866 if (memcmp(a1, a2, pdw << 2)) 867 return false; 868 869 if (pbi) { 870 __be32 mask; 871 872 mask = htonl((0xffffffff) << (32 - pbi)); 873 874 if ((a1[pdw] ^ a2[pdw]) & mask) 875 return false; 876 } 877 878 return true; 879 } 880 881 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen) 882 { 883 /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */ 884 if (sizeof(long) == 4 && prefixlen == 0) 885 return true; 886 return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen))); 887 } 888 889 static __inline__ 890 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli) 891 { 892 __be16 port; 893 switch(fl->flowi_proto) { 894 case IPPROTO_TCP: 895 case IPPROTO_UDP: 896 case IPPROTO_UDPLITE: 897 case IPPROTO_SCTP: 898 port = uli->ports.sport; 899 break; 900 case IPPROTO_ICMP: 901 case IPPROTO_ICMPV6: 902 port = htons(uli->icmpt.type); 903 break; 904 case IPPROTO_MH: 905 port = htons(uli->mht.type); 906 break; 907 case IPPROTO_GRE: 908 port = htons(ntohl(uli->gre_key) >> 16); 909 break; 910 default: 911 port = 0; /*XXX*/ 912 } 913 return port; 914 } 915 916 static __inline__ 917 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli) 918 { 919 __be16 port; 920 switch(fl->flowi_proto) { 921 case IPPROTO_TCP: 922 case IPPROTO_UDP: 923 case IPPROTO_UDPLITE: 924 case IPPROTO_SCTP: 925 port = uli->ports.dport; 926 break; 927 case IPPROTO_ICMP: 928 case IPPROTO_ICMPV6: 929 port = htons(uli->icmpt.code); 930 break; 931 case IPPROTO_GRE: 932 port = htons(ntohl(uli->gre_key) & 0xffff); 933 break; 934 default: 935 port = 0; /*XXX*/ 936 } 937 return port; 938 } 939 940 bool xfrm_selector_match(const struct xfrm_selector *sel, 941 const struct flowi *fl, unsigned short family); 942 943 #ifdef CONFIG_SECURITY_NETWORK_XFRM 944 /* If neither has a context --> match 945 * Otherwise, both must have a context and the sids, doi, alg must match 946 */ 947 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 948 { 949 return ((!s1 && !s2) || 950 (s1 && s2 && 951 (s1->ctx_sid == s2->ctx_sid) && 952 (s1->ctx_doi == s2->ctx_doi) && 953 (s1->ctx_alg == s2->ctx_alg))); 954 } 955 #else 956 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 957 { 958 return true; 959 } 960 #endif 961 962 /* A struct encoding bundle of transformations to apply to some set of flow. 963 * 964 * dst->child points to the next element of bundle. 965 * dst->xfrm points to an instanse of transformer. 966 * 967 * Due to unfortunate limitations of current routing cache, which we 968 * have no time to fix, it mirrors struct rtable and bound to the same 969 * routing key, including saddr,daddr. However, we can have many of 970 * bundles differing by session id. All the bundles grow from a parent 971 * policy rule. 972 */ 973 struct xfrm_dst { 974 union { 975 struct dst_entry dst; 976 struct rtable rt; 977 struct rt6_info rt6; 978 } u; 979 struct dst_entry *route; 980 struct flow_cache_object flo; 981 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; 982 int num_pols, num_xfrms; 983 u32 xfrm_genid; 984 u32 policy_genid; 985 u32 route_mtu_cached; 986 u32 child_mtu_cached; 987 u32 route_cookie; 988 u32 path_cookie; 989 }; 990 991 #ifdef CONFIG_XFRM 992 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 993 { 994 xfrm_pols_put(xdst->pols, xdst->num_pols); 995 dst_release(xdst->route); 996 if (likely(xdst->u.dst.xfrm)) 997 xfrm_state_put(xdst->u.dst.xfrm); 998 } 999 #endif 1000 1001 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 1002 1003 struct xfrm_offload { 1004 /* Output sequence number for replay protection on offloading. */ 1005 struct { 1006 __u32 low; 1007 __u32 hi; 1008 } seq; 1009 1010 __u32 flags; 1011 #define SA_DELETE_REQ 1 1012 #define CRYPTO_DONE 2 1013 #define CRYPTO_NEXT_DONE 4 1014 #define CRYPTO_FALLBACK 8 1015 #define XFRM_GSO_SEGMENT 16 1016 #define XFRM_GRO 32 1017 1018 __u32 status; 1019 #define CRYPTO_SUCCESS 1 1020 #define CRYPTO_GENERIC_ERROR 2 1021 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4 1022 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8 1023 #define CRYPTO_TUNNEL_AH_AUTH_FAILED 16 1024 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32 1025 #define CRYPTO_INVALID_PACKET_SYNTAX 64 1026 #define CRYPTO_INVALID_PROTOCOL 128 1027 1028 __u8 proto; 1029 }; 1030 1031 struct sec_path { 1032 atomic_t refcnt; 1033 int len; 1034 int olen; 1035 1036 struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 1037 struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH]; 1038 }; 1039 1040 static inline int secpath_exists(struct sk_buff *skb) 1041 { 1042 #ifdef CONFIG_XFRM 1043 return skb->sp != NULL; 1044 #else 1045 return 0; 1046 #endif 1047 } 1048 1049 static inline struct sec_path * 1050 secpath_get(struct sec_path *sp) 1051 { 1052 if (sp) 1053 atomic_inc(&sp->refcnt); 1054 return sp; 1055 } 1056 1057 void __secpath_destroy(struct sec_path *sp); 1058 1059 static inline void 1060 secpath_put(struct sec_path *sp) 1061 { 1062 if (sp && atomic_dec_and_test(&sp->refcnt)) 1063 __secpath_destroy(sp); 1064 } 1065 1066 struct sec_path *secpath_dup(struct sec_path *src); 1067 int secpath_set(struct sk_buff *skb); 1068 1069 static inline void 1070 secpath_reset(struct sk_buff *skb) 1071 { 1072 #ifdef CONFIG_XFRM 1073 secpath_put(skb->sp); 1074 skb->sp = NULL; 1075 #endif 1076 } 1077 1078 static inline int 1079 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family) 1080 { 1081 switch (family) { 1082 case AF_INET: 1083 return addr->a4 == 0; 1084 case AF_INET6: 1085 return ipv6_addr_any(&addr->in6); 1086 } 1087 return 0; 1088 } 1089 1090 static inline int 1091 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1092 { 1093 return (tmpl->saddr.a4 && 1094 tmpl->saddr.a4 != x->props.saddr.a4); 1095 } 1096 1097 static inline int 1098 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) 1099 { 1100 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 1101 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 1102 } 1103 1104 static inline int 1105 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family) 1106 { 1107 switch (family) { 1108 case AF_INET: 1109 return __xfrm4_state_addr_cmp(tmpl, x); 1110 case AF_INET6: 1111 return __xfrm6_state_addr_cmp(tmpl, x); 1112 } 1113 return !0; 1114 } 1115 1116 #ifdef CONFIG_XFRM 1117 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, 1118 unsigned short family); 1119 1120 static inline int __xfrm_policy_check2(struct sock *sk, int dir, 1121 struct sk_buff *skb, 1122 unsigned int family, int reverse) 1123 { 1124 struct net *net = dev_net(skb->dev); 1125 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); 1126 1127 if (sk && sk->sk_policy[XFRM_POLICY_IN]) 1128 return __xfrm_policy_check(sk, ndir, skb, family); 1129 1130 return (!net->xfrm.policy_count[dir] && !skb->sp) || 1131 (skb_dst(skb)->flags & DST_NOPOLICY) || 1132 __xfrm_policy_check(sk, ndir, skb, family); 1133 } 1134 1135 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1136 { 1137 return __xfrm_policy_check2(sk, dir, skb, family, 0); 1138 } 1139 1140 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1141 { 1142 return xfrm_policy_check(sk, dir, skb, AF_INET); 1143 } 1144 1145 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1146 { 1147 return xfrm_policy_check(sk, dir, skb, AF_INET6); 1148 } 1149 1150 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1151 struct sk_buff *skb) 1152 { 1153 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); 1154 } 1155 1156 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1157 struct sk_buff *skb) 1158 { 1159 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); 1160 } 1161 1162 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1163 unsigned int family, int reverse); 1164 1165 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, 1166 unsigned int family) 1167 { 1168 return __xfrm_decode_session(skb, fl, family, 0); 1169 } 1170 1171 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1172 struct flowi *fl, 1173 unsigned int family) 1174 { 1175 return __xfrm_decode_session(skb, fl, family, 1); 1176 } 1177 1178 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 1179 1180 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 1181 { 1182 struct net *net = dev_net(skb->dev); 1183 1184 return !net->xfrm.policy_count[XFRM_POLICY_OUT] || 1185 (skb_dst(skb)->flags & DST_NOXFRM) || 1186 __xfrm_route_forward(skb, family); 1187 } 1188 1189 static inline int xfrm4_route_forward(struct sk_buff *skb) 1190 { 1191 return xfrm_route_forward(skb, AF_INET); 1192 } 1193 1194 static inline int xfrm6_route_forward(struct sk_buff *skb) 1195 { 1196 return xfrm_route_forward(skb, AF_INET6); 1197 } 1198 1199 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk); 1200 1201 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) 1202 { 1203 sk->sk_policy[0] = NULL; 1204 sk->sk_policy[1] = NULL; 1205 if (unlikely(osk->sk_policy[0] || osk->sk_policy[1])) 1206 return __xfrm_sk_clone_policy(sk, osk); 1207 return 0; 1208 } 1209 1210 int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 1211 1212 static inline void xfrm_sk_free_policy(struct sock *sk) 1213 { 1214 struct xfrm_policy *pol; 1215 1216 pol = rcu_dereference_protected(sk->sk_policy[0], 1); 1217 if (unlikely(pol != NULL)) { 1218 xfrm_policy_delete(pol, XFRM_POLICY_MAX); 1219 sk->sk_policy[0] = NULL; 1220 } 1221 pol = rcu_dereference_protected(sk->sk_policy[1], 1); 1222 if (unlikely(pol != NULL)) { 1223 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1); 1224 sk->sk_policy[1] = NULL; 1225 } 1226 } 1227 1228 void xfrm_garbage_collect(struct net *net); 1229 void xfrm_garbage_collect_deferred(struct net *net); 1230 1231 #else 1232 1233 static inline void xfrm_sk_free_policy(struct sock *sk) {} 1234 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; } 1235 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 1236 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 1237 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1238 { 1239 return 1; 1240 } 1241 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 1242 { 1243 return 1; 1244 } 1245 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 1246 { 1247 return 1; 1248 } 1249 static inline int xfrm_decode_session_reverse(struct sk_buff *skb, 1250 struct flowi *fl, 1251 unsigned int family) 1252 { 1253 return -ENOSYS; 1254 } 1255 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, 1256 struct sk_buff *skb) 1257 { 1258 return 1; 1259 } 1260 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, 1261 struct sk_buff *skb) 1262 { 1263 return 1; 1264 } 1265 static inline void xfrm_garbage_collect(struct net *net) 1266 { 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); 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); 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 void xfrm_dev_state_delete(struct xfrm_state *x) 1866 { 1867 struct xfrm_state_offload *xso = &x->xso; 1868 1869 if (xso->dev) 1870 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x); 1871 } 1872 1873 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1874 { 1875 struct xfrm_state_offload *xso = &x->xso; 1876 struct net_device *dev = xso->dev; 1877 1878 if (dev && dev->xfrmdev_ops) { 1879 dev->xfrmdev_ops->xdo_dev_state_free(x); 1880 xso->dev = NULL; 1881 dev_put(dev); 1882 } 1883 } 1884 #else 1885 static inline int validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features) 1886 { 1887 return 0; 1888 } 1889 1890 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo) 1891 { 1892 return 0; 1893 } 1894 1895 static inline void xfrm_dev_state_delete(struct xfrm_state *x) 1896 { 1897 } 1898 1899 static inline void xfrm_dev_state_free(struct xfrm_state *x) 1900 { 1901 } 1902 1903 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) 1904 { 1905 return false; 1906 } 1907 #endif 1908 1909 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) 1910 { 1911 if (attrs[XFRMA_MARK]) 1912 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark)); 1913 else 1914 m->v = m->m = 0; 1915 1916 return m->v & m->m; 1917 } 1918 1919 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m) 1920 { 1921 int ret = 0; 1922 1923 if (m->m | m->v) 1924 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); 1925 return ret; 1926 } 1927 1928 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x, 1929 unsigned int family) 1930 { 1931 bool tunnel = false; 1932 1933 switch(family) { 1934 case AF_INET: 1935 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) 1936 tunnel = true; 1937 break; 1938 case AF_INET6: 1939 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) 1940 tunnel = true; 1941 break; 1942 } 1943 if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL)) 1944 return -EINVAL; 1945 1946 return 0; 1947 } 1948 #endif /* _NET_XFRM_H */ 1949