include/net/xfrm.h

   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
  24 #include <linux/interrupt.h>
  25
  26 #ifdef CONFIG_XFRM_STATISTICS
  27 #include <net/snmp.h>
  28 #endif
  29
  30 #define XFRM_PROTO_ESP          50
  31 #define XFRM_PROTO_AH           51
  32 #define XFRM_PROTO_COMP         108
  33 #define XFRM_PROTO_IPIP         4
  34 #define XFRM_PROTO_IPV6         41
  35 #define XFRM_PROTO_ROUTING      IPPROTO_ROUTING
  36 #define XFRM_PROTO_DSTOPTS      IPPROTO_DSTOPTS
  37
  38 #define XFRM_ALIGN8(len)        (((len) + 7) & ~7)
  39 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
  40         MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
  41 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
  42         MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
  43
  44 #ifdef CONFIG_XFRM_STATISTICS
  45 #define XFRM_INC_STATS(net, field)      SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
  46 #define XFRM_INC_STATS_BH(net, field)   SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
  47 #define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
  48 #else
  49 #define XFRM_INC_STATS(net, field)      ((void)(net))
  50 #define XFRM_INC_STATS_BH(net, field)   ((void)(net))
  51 #define XFRM_INC_STATS_USER(net, field) ((void)(net))
  52 #endif
  53
  54 extern struct mutex xfrm_cfg_mutex;
  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         union {
 121                 u8              dying;
 122                 u8              proto;
 123         };
 124         u32                     seq;
 125 };
 126
 127 /* Full description of state of transformer. */
 128 struct xfrm_state {
 129 #ifdef CONFIG_NET_NS
 130         struct net              *xs_net;
 131 #endif
 132         union {
 133                 struct hlist_node       gclist;
 134                 struct hlist_node       bydst;
 135         };
 136         struct hlist_node       bysrc;
 137         struct hlist_node       byspi;
 138
 139         atomic_t                refcnt;
 140         spinlock_t              lock;
 141
 142         struct xfrm_id          id;
 143         struct xfrm_selector    sel;
 144         struct xfrm_mark        mark;
 145
 146         u32                     genid;
 147
 148         /* Key manager bits */
 149         struct xfrm_state_walk  km;
 150
 151         /* Parameters of this state. */
 152         struct {
 153                 u32             reqid;
 154                 u8              mode;
 155                 u8              replay_window;
 156                 u8              aalgo, ealgo, calgo;
 157                 u8              flags;
 158                 u16             family;
 159                 xfrm_address_t  saddr;
 160                 int             header_len;
 161                 int             trailer_len;
 162         } props;
 163
 164         struct xfrm_lifetime_cfg lft;
 165
 166         /* Data for transformer */
 167         struct xfrm_algo_auth   *aalg;
 168         struct xfrm_algo        *ealg;
 169         struct xfrm_algo        *calg;
 170         struct xfrm_algo_aead   *aead;
 171
 172         /* Data for encapsulator */
 173         struct xfrm_encap_tmpl  *encap;
 174
 175         /* Data for care-of address */
 176         xfrm_address_t  *coaddr;
 177
 178         /* IPComp needs an IPIP tunnel for handling uncompressed packets */
 179         struct xfrm_state       *tunnel;
 180
 181         /* If a tunnel, number of users + 1 */
 182         atomic_t                tunnel_users;
 183
 184         /* State for replay detection */
 185         struct xfrm_replay_state replay;
 186
 187         /* Replay detection state at the time we sent the last notification */
 188         struct xfrm_replay_state preplay;
 189
 190         /* internal flag that only holds state for delayed aevent at the
 191          * moment
 192         */
 193         u32                     xflags;
 194
 195         /* Replay detection notification settings */
 196         u32                     replay_maxage;
 197         u32                     replay_maxdiff;
 198
 199         /* Replay detection notification timer */
 200         struct timer_list       rtimer;
 201
 202         /* Statistics */
 203         struct xfrm_stats       stats;
 204
 205         struct xfrm_lifetime_cur curlft;
 206         struct tasklet_hrtimer  mtimer;
 207
 208         /* Last used time */
 209         unsigned long           lastused;
 210
 211         /* Reference to data common to all the instances of this
 212          * transformer. */
 213         const struct xfrm_type  *type;
 214         struct xfrm_mode        *inner_mode;
 215         struct xfrm_mode        *inner_mode_iaf;
 216         struct xfrm_mode        *outer_mode;
 217
 218         /* Security context */
 219         struct xfrm_sec_ctx     *security;
 220
 221         /* Private data of this transformer, format is opaque,
 222          * interpreted by xfrm_type methods. */
 223         void                    *data;
 224 };
 225
 226 static inline struct net *xs_net(struct xfrm_state *x)
 227 {
 228         return read_pnet(&x->xs_net);
 229 }
 230
 231 /* xflags - make enum if more show up */
 232 #define XFRM_TIME_DEFER 1
 233
 234 enum {
 235         XFRM_STATE_VOID,
 236         XFRM_STATE_ACQ,
 237         XFRM_STATE_VALID,
 238         XFRM_STATE_ERROR,
 239         XFRM_STATE_EXPIRED,
 240         XFRM_STATE_DEAD
 241 };
 242
 243 /* callback structure passed from either netlink or pfkey */
 244 struct km_event {
 245         union {
 246                 u32 hard;
 247                 u32 proto;
 248                 u32 byid;
 249                 u32 aevent;
 250                 u32 type;
 251         } data;
 252
 253         u32     seq;
 254         u32     pid;
 255         u32     event;
 256         struct net *net;
 257 };
 258
 259 struct net_device;
 260 struct xfrm_type;
 261 struct xfrm_dst;
 262 struct xfrm_policy_afinfo {
 263         unsigned short          family;
 264         struct dst_ops          *dst_ops;
 265         void                    (*garbage_collect)(struct net *net);
 266         struct dst_entry        *(*dst_lookup)(struct net *net, int tos,
 267                                                xfrm_address_t *saddr,
 268                                                xfrm_address_t *daddr);
 269         int                     (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
 270         struct dst_entry        *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
 271         void                    (*decode_session)(struct sk_buff *skb,
 272                                                   struct flowi *fl,
 273                                                   int reverse);
 274         int                     (*get_tos)(struct flowi *fl);
 275         int                     (*init_path)(struct xfrm_dst *path,
 276                                              struct dst_entry *dst,
 277                                              int nfheader_len);
 278         int                     (*fill_dst)(struct xfrm_dst *xdst,
 279                                             struct net_device *dev,
 280                                             struct flowi *fl);
 281 };
 282
 283 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
 284 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
 285 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
 286 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
 287
 288 struct xfrm_tmpl;
 289 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
 290 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
 291 extern int __xfrm_state_delete(struct xfrm_state *x);
 292
 293 struct xfrm_state_afinfo {
 294         unsigned int            family;
 295         unsigned int            proto;
 296         __be16                  eth_proto;
 297         struct module           *owner;
 298         const struct xfrm_type  *type_map[IPPROTO_MAX];
 299         struct xfrm_mode        *mode_map[XFRM_MODE_MAX];
 300         int                     (*init_flags)(struct xfrm_state *x);
 301         void                    (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
 302                                                 struct xfrm_tmpl *tmpl,
 303                                                 xfrm_address_t *daddr, xfrm_address_t *saddr);
 304         int                     (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
 305         int                     (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
 306         int                     (*output)(struct sk_buff *skb);
 307         int                     (*extract_input)(struct xfrm_state *x,
 308                                                  struct sk_buff *skb);
 309         int                     (*extract_output)(struct xfrm_state *x,
 310                                                   struct sk_buff *skb);
 311         int                     (*transport_finish)(struct sk_buff *skb,
 312                                                     int async);
 313 };
 314
 315 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
 316 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
 317
 318 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
 319
 320 struct xfrm_type {
 321         char                    *description;
 322         struct module           *owner;
 323         u8                      proto;
 324         u8                      flags;
 325 #define XFRM_TYPE_NON_FRAGMENT  1
 326 #define XFRM_TYPE_REPLAY_PROT   2
 327 #define XFRM_TYPE_LOCAL_COADDR  4
 328 #define XFRM_TYPE_REMOTE_COADDR 8
 329
 330         int                     (*init_state)(struct xfrm_state *x);
 331         void                    (*destructor)(struct xfrm_state *);
 332         int                     (*input)(struct xfrm_state *, struct sk_buff *skb);
 333         int                     (*output)(struct xfrm_state *, struct sk_buff *pskb);
 334         int                     (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
 335         int                     (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
 336         /* Estimate maximal size of result of transformation of a dgram */
 337         u32                     (*get_mtu)(struct xfrm_state *, int size);
 338 };
 339
 340 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
 341 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
 342
 343 struct xfrm_mode {
 344         /*
 345          * Remove encapsulation header.
 346          *
 347          * The IP header will be moved over the top of the encapsulation
 348          * header.
 349          *
 350          * On entry, the transport header shall point to where the IP header
 351          * should be and the network header shall be set to where the IP
 352          * header currently is.  skb->data shall point to the start of the
 353          * payload.
 354          */
 355         int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
 356
 357         /*
 358          * This is the actual input entry point.
 359          *
 360          * For transport mode and equivalent this would be identical to
 361          * input2 (which does not need to be set).  While tunnel mode
 362          * and equivalent would set this to the tunnel encapsulation function
 363          * xfrm4_prepare_input that would in turn call input2.
 364          */
 365         int (*input)(struct xfrm_state *x, struct sk_buff *skb);
 366
 367         /*
 368          * Add encapsulation header.
 369          *
 370          * On exit, the transport header will be set to the start of the
 371          * encapsulation header to be filled in by x->type->output and
 372          * the mac header will be set to the nextheader (protocol for
 373          * IPv4) field of the extension header directly preceding the
 374          * encapsulation header, or in its absence, that of the top IP
 375          * header.  The value of the network header will always point
 376          * to the top IP header while skb->data will point to the payload.
 377          */
 378         int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
 379
 380         /*
 381          * This is the actual output entry point.
 382          *
 383          * For transport mode and equivalent this would be identical to
 384          * output2 (which does not need to be set).  While tunnel mode
 385          * and equivalent would set this to a tunnel encapsulation function
 386          * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
 387          * call output2.
 388          */
 389         int (*output)(struct xfrm_state *x, struct sk_buff *skb);
 390
 391         struct xfrm_state_afinfo *afinfo;
 392         struct module *owner;
 393         unsigned int encap;
 394         int flags;
 395 };
 396
 397 /* Flags for xfrm_mode. */
 398 enum {
 399         XFRM_MODE_FLAG_TUNNEL = 1,
 400 };
 401
 402 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
 403 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
 404
 405 static inline int xfrm_af2proto(unsigned int family)
 406 {
 407         switch(family) {
 408         case AF_INET:
 409                 return IPPROTO_IPIP;
 410         case AF_INET6:
 411                 return IPPROTO_IPV6;
 412         default:
 413                 return 0;
 414         }
 415 }
 416
 417 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
 418 {
 419         if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
 420             (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
 421                 return x->inner_mode;
 422         else
 423                 return x->inner_mode_iaf;
 424 }
 425
 426 struct xfrm_tmpl {
 427 /* id in template is interpreted as:
 428  * daddr - destination of tunnel, may be zero for transport mode.
 429  * spi   - zero to acquire spi. Not zero if spi is static, then
 430  *         daddr must be fixed too.
 431  * proto - AH/ESP/IPCOMP
 432  */
 433         struct xfrm_id          id;
 434
 435 /* Source address of tunnel. Ignored, if it is not a tunnel. */
 436         xfrm_address_t          saddr;
 437
 438         unsigned short          encap_family;
 439
 440         u32                     reqid;
 441
 442 /* Mode: transport, tunnel etc. */
 443         u8                      mode;
 444
 445 /* Sharing mode: unique, this session only, this user only etc. */
 446         u8                      share;
 447
 448 /* May skip this transfomration if no SA is found */
 449         u8                      optional;
 450
 451 /* Skip aalgos/ealgos/calgos checks. */
 452         u8                      allalgs;
 453
 454 /* Bit mask of algos allowed for acquisition */
 455         u32                     aalgos;
 456         u32                     ealgos;
 457         u32                     calgos;
 458 };
 459
 460 #define XFRM_MAX_DEPTH          6
 461
 462 struct xfrm_policy_walk_entry {
 463         struct list_head        all;
 464         u8                      dead;
 465 };
 466
 467 struct xfrm_policy_walk {
 468         struct xfrm_policy_walk_entry walk;
 469         u8 type;
 470         u32 seq;
 471 };
 472
 473 struct xfrm_policy {
 474 #ifdef CONFIG_NET_NS
 475         struct net              *xp_net;
 476 #endif
 477         struct hlist_node       bydst;
 478         struct hlist_node       byidx;
 479
 480         /* This lock only affects elements except for entry. */
 481         rwlock_t                lock;
 482         atomic_t                refcnt;
 483         struct timer_list       timer;
 484
 485         u32                     priority;
 486         u32                     index;
 487         struct xfrm_mark        mark;
 488         struct xfrm_selector    selector;
 489         struct xfrm_lifetime_cfg lft;
 490         struct xfrm_lifetime_cur curlft;
 491         struct dst_entry       *bundles;
 492         struct xfrm_policy_walk_entry walk;
 493         u8                      type;
 494         u8                      action;
 495         u8                      flags;
 496         u8                      xfrm_nr;
 497         u16                     family;
 498         struct xfrm_sec_ctx     *security;
 499         struct xfrm_tmpl        xfrm_vec[XFRM_MAX_DEPTH];
 500 };
 501
 502 static inline struct net *xp_net(struct xfrm_policy *xp)
 503 {
 504         return read_pnet(&xp->xp_net);
 505 }
 506
 507 struct xfrm_kmaddress {
 508         xfrm_address_t          local;
 509         xfrm_address_t          remote;
 510         u32                     reserved;
 511         u16                     family;
 512 };
 513
 514 struct xfrm_migrate {
 515         xfrm_address_t          old_daddr;
 516         xfrm_address_t          old_saddr;
 517         xfrm_address_t          new_daddr;
 518         xfrm_address_t          new_saddr;
 519         u8                      proto;
 520         u8                      mode;
 521         u16                     reserved;
 522         u32                     reqid;
 523         u16                     old_family;
 524         u16                     new_family;
 525 };
 526
 527 #define XFRM_KM_TIMEOUT                30
 528 /* which seqno */
 529 #define XFRM_REPLAY_SEQ         1
 530 #define XFRM_REPLAY_OSEQ        2
 531 #define XFRM_REPLAY_SEQ_MASK    3
 532 /* what happened */
 533 #define XFRM_REPLAY_UPDATE      XFRM_AE_CR
 534 #define XFRM_REPLAY_TIMEOUT     XFRM_AE_CE
 535
 536 /* default aevent timeout in units of 100ms */
 537 #define XFRM_AE_ETIME                   10
 538 /* Async Event timer multiplier */
 539 #define XFRM_AE_ETH_M                   10
 540 /* default seq threshold size */
 541 #define XFRM_AE_SEQT_SIZE               2
 542
 543 struct xfrm_mgr {
 544         struct list_head        list;
 545         char                    *id;
 546         int                     (*notify)(struct xfrm_state *x, struct km_event *c);
 547         int                     (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
 548         struct xfrm_policy      *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
 549         int                     (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
 550         int                     (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
 551         int                     (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
 552         int                     (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
 553 };
 554
 555 extern int xfrm_register_km(struct xfrm_mgr *km);
 556 extern int xfrm_unregister_km(struct xfrm_mgr *km);
 557
 558 /*
 559  * This structure is used for the duration where packets are being
 560  * transformed by IPsec.  As soon as the packet leaves IPsec the
 561  * area beyond the generic IP part may be overwritten.
 562  */
 563 struct xfrm_skb_cb {
 564         union {
 565                 struct inet_skb_parm h4;
 566                 struct inet6_skb_parm h6;
 567         } header;
 568
 569         /* Sequence number for replay protection. */
 570         union {
 571                 u64 output;
 572                 __be32 input;
 573         } seq;
 574 };
 575
 576 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
 577
 578 /*
 579  * This structure is used by the afinfo prepare_input/prepare_output functions
 580  * to transmit header information to the mode input/output functions.
 581  */
 582 struct xfrm_mode_skb_cb {
 583         union {
 584                 struct inet_skb_parm h4;
 585                 struct inet6_skb_parm h6;
 586         } header;
 587
 588         /* Copied from header for IPv4, always set to zero and DF for IPv6. */
 589         __be16 id;
 590         __be16 frag_off;
 591
 592         /* IP header length (excluding options or extension headers). */
 593         u8 ihl;
 594
 595         /* TOS for IPv4, class for IPv6. */
 596         u8 tos;
 597
 598         /* TTL for IPv4, hop limitfor IPv6. */
 599         u8 ttl;
 600
 601         /* Protocol for IPv4, NH for IPv6. */
 602         u8 protocol;
 603
 604         /* Option length for IPv4, zero for IPv6. */
 605         u8 optlen;
 606
 607         /* Used by IPv6 only, zero for IPv4. */
 608         u8 flow_lbl[3];
 609 };
 610
 611 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
 612
 613 /*
 614  * This structure is used by the input processing to locate the SPI and
 615  * related information.
 616  */
 617 struct xfrm_spi_skb_cb {
 618         union {
 619                 struct inet_skb_parm h4;
 620                 struct inet6_skb_parm h6;
 621         } header;
 622
 623         unsigned int daddroff;
 624         unsigned int family;
 625 };
 626
 627 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
 628
 629 /* Audit Information */
 630 struct xfrm_audit {
 631         u32     secid;
 632         uid_t   loginuid;
 633         u32     sessionid;
 634 };
 635
 636 #ifdef CONFIG_AUDITSYSCALL
 637 static inline struct audit_buffer *xfrm_audit_start(const char *op)
 638 {
 639         struct audit_buffer *audit_buf = NULL;
 640
 641         if (audit_enabled == 0)
 642                 return NULL;
 643         audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
 644                                     AUDIT_MAC_IPSEC_EVENT);
 645         if (audit_buf == NULL)
 646                 return NULL;
 647         audit_log_format(audit_buf, "op=%s", op);
 648         return audit_buf;
 649 }
 650
 651 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
 652                                              struct audit_buffer *audit_buf)
 653 {
 654         char *secctx;
 655         u32 secctx_len;
 656
 657         audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
 658         if (secid != 0 &&
 659             security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
 660                 audit_log_format(audit_buf, " subj=%s", secctx);
 661                 security_release_secctx(secctx, secctx_len);
 662         } else
 663                 audit_log_task_context(audit_buf);
 664 }
 665
 666 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 667                                   u32 auid, u32 ses, u32 secid);
 668 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 669                                   u32 auid, u32 ses, u32 secid);
 670 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
 671                                  u32 auid, u32 ses, u32 secid);
 672 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 673                                     u32 auid, u32 ses, u32 secid);
 674 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 675                                              struct sk_buff *skb);
 676 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
 677 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 678                                       __be32 net_spi, __be32 net_seq);
 679 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
 680                                      struct sk_buff *skb, u8 proto);
 681 #else
 682
 683 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 684                                   u32 auid, u32 ses, u32 secid)
 685 {
 686 }
 687
 688 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 689                                   u32 auid, u32 ses, u32 secid)
 690 {
 691 }
 692
 693 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
 694                                  u32 auid, u32 ses, u32 secid)
 695 {
 696 }
 697
 698 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 699                                     u32 auid, u32 ses, u32 secid)
 700 {
 701 }
 702
 703 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 704                                              struct sk_buff *skb)
 705 {
 706 }
 707
 708 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
 709                                       u16 family)
 710 {
 711 }
 712
 713 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 714                                       __be32 net_spi, __be32 net_seq)
 715 {
 716 }
 717
 718 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
 719                                      struct sk_buff *skb, u8 proto)
 720 {
 721 }
 722 #endif /* CONFIG_AUDITSYSCALL */
 723
 724 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
 725 {
 726         if (likely(policy != NULL))
 727                 atomic_inc(&policy->refcnt);
 728 }
 729
 730 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
 731
 732 static inline void xfrm_pol_put(struct xfrm_policy *policy)
 733 {
 734         if (atomic_dec_and_test(&policy->refcnt))
 735                 xfrm_policy_destroy(policy);
 736 }
 737
 738 #ifdef CONFIG_XFRM_SUB_POLICY
 739 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 740 {
 741         int i;
 742         for (i = npols - 1; i >= 0; --i)
 743                 xfrm_pol_put(pols[i]);
 744 }
 745 #else
 746 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 747 {
 748         xfrm_pol_put(pols[0]);
 749 }
 750 #endif
 751
 752 extern void __xfrm_state_destroy(struct xfrm_state *);
 753
 754 static inline void __xfrm_state_put(struct xfrm_state *x)
 755 {
 756         atomic_dec(&x->refcnt);
 757 }
 758
 759 static inline void xfrm_state_put(struct xfrm_state *x)
 760 {
 761         if (atomic_dec_and_test(&x->refcnt))
 762                 __xfrm_state_destroy(x);
 763 }
 764
 765 static inline void xfrm_state_hold(struct xfrm_state *x)
 766 {
 767         atomic_inc(&x->refcnt);
 768 }
 769
 770 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
 771 {
 772         __be32 *a1 = token1;
 773         __be32 *a2 = token2;
 774         int pdw;
 775         int pbi;
 776
 777         pdw = prefixlen >> 5;     /* num of whole u32 in prefix */
 778         pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
 779
 780         if (pdw)
 781                 if (memcmp(a1, a2, pdw << 2))
 782                         return 0;
 783
 784         if (pbi) {
 785                 __be32 mask;
 786
 787                 mask = htonl((0xffffffff) << (32 - pbi));
 788
 789                 if ((a1[pdw] ^ a2[pdw]) & mask)
 790                         return 0;
 791         }
 792
 793         return 1;
 794 }
 795
 796 static __inline__
 797 __be16 xfrm_flowi_sport(struct flowi *fl)
 798 {
 799         __be16 port;
 800         switch(fl->proto) {
 801         case IPPROTO_TCP:
 802         case IPPROTO_UDP:
 803         case IPPROTO_UDPLITE:
 804         case IPPROTO_SCTP:
 805                 port = fl->fl_ip_sport;
 806                 break;
 807         case IPPROTO_ICMP:
 808         case IPPROTO_ICMPV6:
 809                 port = htons(fl->fl_icmp_type);
 810                 break;
 811         case IPPROTO_MH:
 812                 port = htons(fl->fl_mh_type);
 813                 break;
 814         default:
 815                 port = 0;       /*XXX*/
 816         }
 817         return port;
 818 }
 819
 820 static __inline__
 821 __be16 xfrm_flowi_dport(struct flowi *fl)
 822 {
 823         __be16 port;
 824         switch(fl->proto) {
 825         case IPPROTO_TCP:
 826         case IPPROTO_UDP:
 827         case IPPROTO_UDPLITE:
 828         case IPPROTO_SCTP:
 829                 port = fl->fl_ip_dport;
 830                 break;
 831         case IPPROTO_ICMP:
 832         case IPPROTO_ICMPV6:
 833                 port = htons(fl->fl_icmp_code);
 834                 break;
 835         default:
 836                 port = 0;       /*XXX*/
 837         }
 838         return port;
 839 }
 840
 841 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
 842                                unsigned short family);
 843
 844 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 845 /*      If neither has a context --> match
 846  *      Otherwise, both must have a context and the sids, doi, alg must match
 847  */
 848 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 849 {
 850         return ((!s1 && !s2) ||
 851                 (s1 && s2 &&
 852                  (s1->ctx_sid == s2->ctx_sid) &&
 853                  (s1->ctx_doi == s2->ctx_doi) &&
 854                  (s1->ctx_alg == s2->ctx_alg)));
 855 }
 856 #else
 857 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 858 {
 859         return 1;
 860 }
 861 #endif
 862
 863 /* A struct encoding bundle of transformations to apply to some set of flow.
 864  *
 865  * dst->child points to the next element of bundle.
 866  * dst->xfrm  points to an instanse of transformer.
 867  *
 868  * Due to unfortunate limitations of current routing cache, which we
 869  * have no time to fix, it mirrors struct rtable and bound to the same
 870  * routing key, including saddr,daddr. However, we can have many of
 871  * bundles differing by session id. All the bundles grow from a parent
 872  * policy rule.
 873  */
 874 struct xfrm_dst {
 875         union {
 876                 struct dst_entry        dst;
 877                 struct rtable           rt;
 878                 struct rt6_info         rt6;
 879         } u;
 880         struct dst_entry *route;
 881 #ifdef CONFIG_XFRM_SUB_POLICY
 882         struct flowi *origin;
 883         struct xfrm_selector *partner;
 884 #endif
 885         u32 genid;
 886         u32 route_mtu_cached;
 887         u32 child_mtu_cached;
 888         u32 route_cookie;
 889         u32 path_cookie;
 890 };
 891
 892 #ifdef CONFIG_XFRM
 893 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
 894 {
 895         dst_release(xdst->route);
 896         if (likely(xdst->u.dst.xfrm))
 897                 xfrm_state_put(xdst->u.dst.xfrm);
 898 #ifdef CONFIG_XFRM_SUB_POLICY
 899         kfree(xdst->origin);
 900         xdst->origin = NULL;
 901         kfree(xdst->partner);
 902         xdst->partner = NULL;
 903 #endif
 904 }
 905 #endif
 906
 907 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
 908
 909 struct sec_path {
 910         atomic_t                refcnt;
 911         int                     len;
 912         struct xfrm_state       *xvec[XFRM_MAX_DEPTH];
 913 };
 914
 915 static inline struct sec_path *
 916 secpath_get(struct sec_path *sp)
 917 {
 918         if (sp)
 919                 atomic_inc(&sp->refcnt);
 920         return sp;
 921 }
 922
 923 extern void __secpath_destroy(struct sec_path *sp);
 924
 925 static inline void
 926 secpath_put(struct sec_path *sp)
 927 {
 928         if (sp && atomic_dec_and_test(&sp->refcnt))
 929                 __secpath_destroy(sp);
 930 }
 931
 932 extern struct sec_path *secpath_dup(struct sec_path *src);
 933
 934 static inline void
 935 secpath_reset(struct sk_buff *skb)
 936 {
 937 #ifdef CONFIG_XFRM
 938         secpath_put(skb->sp);
 939         skb->sp = NULL;
 940 #endif
 941 }
 942
 943 static inline int
 944 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
 945 {
 946         switch (family) {
 947         case AF_INET:
 948                 return addr->a4 == 0;
 949         case AF_INET6:
 950                 return ipv6_addr_any((struct in6_addr *)&addr->a6);
 951         }
 952         return 0;
 953 }
 954
 955 static inline int
 956 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 957 {
 958         return  (tmpl->saddr.a4 &&
 959                  tmpl->saddr.a4 != x->props.saddr.a4);
 960 }
 961
 962 static inline int
 963 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 964 {
 965         return  (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
 966                  ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
 967 }
 968
 969 static inline int
 970 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
 971 {
 972         switch (family) {
 973         case AF_INET:
 974                 return __xfrm4_state_addr_cmp(tmpl, x);
 975         case AF_INET6:
 976                 return __xfrm6_state_addr_cmp(tmpl, x);
 977         }
 978         return !0;
 979 }
 980
 981 #ifdef CONFIG_XFRM
 982 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
 983
 984 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
 985                                        struct sk_buff *skb,
 986                                        unsigned int family, int reverse)
 987 {
 988         struct net *net = dev_net(skb->dev);
 989         int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
 990
 991         if (sk && sk->sk_policy[XFRM_POLICY_IN])
 992                 return __xfrm_policy_check(sk, ndir, skb, family);
 993
 994         return  (!net->xfrm.policy_count[dir] && !skb->sp) ||
 995                 (skb_dst(skb)->flags & DST_NOPOLICY) ||
 996                 __xfrm_policy_check(sk, ndir, skb, family);
 997 }
 998
 999 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1000 {
1001         return __xfrm_policy_check2(sk, dir, skb, family, 0);
1002 }
1003
1004 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1005 {
1006         return xfrm_policy_check(sk, dir, skb, AF_INET);
1007 }
1008
1009 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1010 {
1011         return xfrm_policy_check(sk, dir, skb, AF_INET6);
1012 }
1013
1014 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1015                                              struct sk_buff *skb)
1016 {
1017         return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1018 }
1019
1020 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1021                                              struct sk_buff *skb)
1022 {
1023         return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1024 }
1025
1026 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1027                                  unsigned int family, int reverse);
1028
1029 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1030                                       unsigned int family)
1031 {
1032         return __xfrm_decode_session(skb, fl, family, 0);
1033 }
1034
1035 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1036                                               struct flowi *fl,
1037                                               unsigned int family)
1038 {
1039         return __xfrm_decode_session(skb, fl, family, 1);
1040 }
1041
1042 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1043
1044 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1045 {
1046         struct net *net = dev_net(skb->dev);
1047
1048         return  !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1049                 (skb_dst(skb)->flags & DST_NOXFRM) ||
1050                 __xfrm_route_forward(skb, family);
1051 }
1052
1053 static inline int xfrm4_route_forward(struct sk_buff *skb)
1054 {
1055         return xfrm_route_forward(skb, AF_INET);
1056 }
1057
1058 static inline int xfrm6_route_forward(struct sk_buff *skb)
1059 {
1060         return xfrm_route_forward(skb, AF_INET6);
1061 }
1062
1063 extern int __xfrm_sk_clone_policy(struct sock *sk);
1064
1065 static inline int xfrm_sk_clone_policy(struct sock *sk)
1066 {
1067         if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1068                 return __xfrm_sk_clone_policy(sk);
1069         return 0;
1070 }
1071
1072 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1073
1074 static inline void xfrm_sk_free_policy(struct sock *sk)
1075 {
1076         if (unlikely(sk->sk_policy[0] != NULL)) {
1077                 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1078                 sk->sk_policy[0] = NULL;
1079         }
1080         if (unlikely(sk->sk_policy[1] != NULL)) {
1081                 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1082                 sk->sk_policy[1] = NULL;
1083         }
1084 }
1085
1086 #else
1087
1088 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1089 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1090 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1091 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1092 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1093 {
1094         return 1;
1095 }
1096 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1097 {
1098         return 1;
1099 }
1100 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1101 {
1102         return 1;
1103 }
1104 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1105                                               struct flowi *fl,
1106                                               unsigned int family)
1107 {
1108         return -ENOSYS;
1109 }
1110 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1111                                              struct sk_buff *skb)
1112 {
1113         return 1;
1114 }
1115 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1116                                              struct sk_buff *skb)
1117 {
1118         return 1;
1119 }
1120 #endif
1121
1122 static __inline__
1123 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1124 {
1125         switch (family){
1126         case AF_INET:
1127                 return (xfrm_address_t *)&fl->fl4_dst;
1128         case AF_INET6:
1129                 return (xfrm_address_t *)&fl->fl6_dst;
1130         }
1131         return NULL;
1132 }
1133
1134 static __inline__
1135 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1136 {
1137         switch (family){
1138         case AF_INET:
1139                 return (xfrm_address_t *)&fl->fl4_src;
1140         case AF_INET6:
1141                 return (xfrm_address_t *)&fl->fl6_src;
1142         }
1143         return NULL;
1144 }
1145
1146 static __inline__
1147 void xfrm_flowi_addr_get(struct flowi *fl,
1148                          xfrm_address_t *saddr, xfrm_address_t *daddr,
1149                          unsigned short family)
1150 {
1151         switch(family) {
1152         case AF_INET:
1153                 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1154                 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1155                 break;
1156         case AF_INET6:
1157                 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1158                 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1159                 break;
1160         }
1161 }
1162
1163 static __inline__ int
1164 __xfrm4_state_addr_check(struct xfrm_state *x,
1165                          xfrm_address_t *daddr, xfrm_address_t *saddr)
1166 {
1167         if (daddr->a4 == x->id.daddr.a4 &&
1168             (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1169                 return 1;
1170         return 0;
1171 }
1172
1173 static __inline__ int
1174 __xfrm6_state_addr_check(struct xfrm_state *x,
1175                          xfrm_address_t *daddr, xfrm_address_t *saddr)
1176 {
1177         if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1178             (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1179              ipv6_addr_any((struct in6_addr *)saddr) ||
1180              ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1181                 return 1;
1182         return 0;
1183 }
1184
1185 static __inline__ int
1186 xfrm_state_addr_check(struct xfrm_state *x,
1187                       xfrm_address_t *daddr, xfrm_address_t *saddr,
1188                       unsigned short family)
1189 {
1190         switch (family) {
1191         case AF_INET:
1192                 return __xfrm4_state_addr_check(x, daddr, saddr);
1193         case AF_INET6:
1194                 return __xfrm6_state_addr_check(x, daddr, saddr);
1195         }
1196         return 0;
1197 }
1198
1199 static __inline__ int
1200 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1201                            unsigned short family)
1202 {
1203         switch (family) {
1204         case AF_INET:
1205                 return __xfrm4_state_addr_check(x,
1206                                                 (xfrm_address_t *)&fl->fl4_dst,
1207                                                 (xfrm_address_t *)&fl->fl4_src);
1208         case AF_INET6:
1209                 return __xfrm6_state_addr_check(x,
1210                                                 (xfrm_address_t *)&fl->fl6_dst,
1211                                                 (xfrm_address_t *)&fl->fl6_src);
1212         }
1213         return 0;
1214 }
1215
1216 static inline int xfrm_state_kern(struct xfrm_state *x)
1217 {
1218         return atomic_read(&x->tunnel_users);
1219 }
1220
1221 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1222 {
1223         return (!userproto || proto == userproto ||
1224                 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1225                                                   proto == IPPROTO_ESP ||
1226                                                   proto == IPPROTO_COMP)));
1227 }
1228
1229 /*
1230  * xfrm algorithm information
1231  */
1232 struct xfrm_algo_aead_info {
1233         u16 icv_truncbits;
1234 };
1235
1236 struct xfrm_algo_auth_info {
1237         u16 icv_truncbits;
1238         u16 icv_fullbits;
1239 };
1240
1241 struct xfrm_algo_encr_info {
1242         u16 blockbits;
1243         u16 defkeybits;
1244 };
1245
1246 struct xfrm_algo_comp_info {
1247         u16 threshold;
1248 };
1249
1250 struct xfrm_algo_desc {
1251         char *name;
1252         char *compat;
1253         u8 available:1;
1254         union {
1255                 struct xfrm_algo_aead_info aead;
1256                 struct xfrm_algo_auth_info auth;
1257                 struct xfrm_algo_encr_info encr;
1258                 struct xfrm_algo_comp_info comp;
1259         } uinfo;
1260         struct sadb_alg desc;
1261 };
1262
1263 /* XFRM tunnel handlers.  */
1264 struct xfrm_tunnel {
1265         int (*handler)(struct sk_buff *skb);
1266         int (*err_handler)(struct sk_buff *skb, u32 info);
1267
1268         struct xfrm_tunnel *next;
1269         int priority;
1270 };
1271
1272 struct xfrm6_tunnel {
1273         int (*handler)(struct sk_buff *skb);
1274         int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1275                            u8 type, u8 code, int offset, __be32 info);
1276         struct xfrm6_tunnel *next;
1277         int priority;
1278 };
1279
1280 extern void xfrm_init(void);
1281 extern void xfrm4_init(int rt_hash_size);
1282 extern int xfrm_state_init(struct net *net);
1283 extern void xfrm_state_fini(struct net *net);
1284 extern void xfrm4_state_init(void);
1285 #ifdef CONFIG_XFRM
1286 extern int xfrm6_init(void);
1287 extern void xfrm6_fini(void);
1288 extern int xfrm6_state_init(void);
1289 extern void xfrm6_state_fini(void);
1290 #else
1291 static inline int xfrm6_init(void)
1292 {
1293         return 0;
1294 }
1295 static inline void xfrm6_fini(void)
1296 {
1297         ;
1298 }
1299 #endif
1300
1301 #ifdef CONFIG_XFRM_STATISTICS
1302 extern int xfrm_proc_init(struct net *net);
1303 extern void xfrm_proc_fini(struct net *net);
1304 #endif
1305
1306 extern int xfrm_sysctl_init(struct net *net);
1307 #ifdef CONFIG_SYSCTL
1308 extern void xfrm_sysctl_fini(struct net *net);
1309 #else
1310 static inline void xfrm_sysctl_fini(struct net *net)
1311 {
1312 }
1313 #endif
1314
1315 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1316 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1317                            int (*func)(struct xfrm_state *, int, void*), void *);
1318 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1319 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1320 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1321                                           struct flowi *fl, struct xfrm_tmpl *tmpl,
1322                                           struct xfrm_policy *pol, int *err,
1323                                           unsigned short family);
1324 extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1325                                                xfrm_address_t *daddr,
1326                                                xfrm_address_t *saddr,
1327                                                unsigned short family,
1328                                                u8 mode, u8 proto, u32 reqid);
1329 extern int xfrm_state_check_expire(struct xfrm_state *x);
1330 extern void xfrm_state_insert(struct xfrm_state *x);
1331 extern int xfrm_state_add(struct xfrm_state *x);
1332 extern int xfrm_state_update(struct xfrm_state *x);
1333 extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1334                                             xfrm_address_t *daddr, __be32 spi,
1335                                             u8 proto, unsigned short family);
1336 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1337                                                    xfrm_address_t *daddr,
1338                                                    xfrm_address_t *saddr,
1339                                                    u8 proto,
1340                                                    unsigned short family);
1341 #ifdef CONFIG_XFRM_SUB_POLICY
1342 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1343                           int n, unsigned short family);
1344 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1345                            int n, unsigned short family);
1346 #else
1347 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1348                                  int n, unsigned short family)
1349 {
1350         return -ENOSYS;
1351 }
1352
1353 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1354                                   int n, unsigned short family)
1355 {
1356         return -ENOSYS;
1357 }
1358 #endif
1359
1360 struct xfrmk_sadinfo {
1361         u32 sadhcnt; /* current hash bkts */
1362         u32 sadhmcnt; /* max allowed hash bkts */
1363         u32 sadcnt; /* current running count */
1364 };
1365
1366 struct xfrmk_spdinfo {
1367         u32 incnt;
1368         u32 outcnt;
1369         u32 fwdcnt;
1370         u32 inscnt;
1371         u32 outscnt;
1372         u32 fwdscnt;
1373         u32 spdhcnt;
1374         u32 spdhmcnt;
1375 };
1376
1377 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark,
1378                                               u32 seq);
1379 extern int xfrm_state_delete(struct xfrm_state *x);
1380 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1381 extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1382 extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1383 extern int xfrm_replay_check(struct xfrm_state *x,
1384                              struct sk_buff *skb, __be32 seq);
1385 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1386 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1387 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1388 extern int xfrm_init_state(struct xfrm_state *x);
1389 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1390 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1391                       int encap_type);
1392 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1393 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1394 extern int xfrm_output(struct sk_buff *skb);
1395 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1396 extern int xfrm4_extract_header(struct sk_buff *skb);
1397 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1398 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1399                            int encap_type);
1400 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1401 extern int xfrm4_rcv(struct sk_buff *skb);
1402
1403 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1404 {
1405         return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1406 }
1407
1408 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1409 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1410 extern int xfrm4_output(struct sk_buff *skb);
1411 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1412 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1413 extern int xfrm6_extract_header(struct sk_buff *skb);
1414 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1415 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1416 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1417 extern int xfrm6_rcv(struct sk_buff *skb);
1418 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1419                             xfrm_address_t *saddr, u8 proto);
1420 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1421 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1422 extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1423 extern void xfrm6_tunnel_free_spi(struct net *net, xfrm_address_t *saddr);
1424 extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, xfrm_address_t *saddr);
1425 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1426 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1427 extern int xfrm6_output(struct sk_buff *skb);
1428 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1429                                  u8 **prevhdr);
1430
1431 #ifdef CONFIG_XFRM
1432 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1433 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1434 #else
1435 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1436 {
1437         return -ENOPROTOOPT;
1438 }
1439
1440 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1441 {
1442         /* should not happen */
1443         kfree_skb(skb);
1444         return 0;
1445 }
1446 #endif
1447
1448 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1449
1450 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1451 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1452         int (*func)(struct xfrm_policy *, int, int, void*), void *);
1453 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1454 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1455 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1456                                           u8 type, int dir,
1457                                           struct xfrm_selector *sel,
1458                                           struct xfrm_sec_ctx *ctx, int delete,
1459                                           int *err);
1460 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err);
1461 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1462 u32 xfrm_get_acqseq(void);
1463 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1464 struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark,
1465                                  u8 mode, u32 reqid, u8 proto,
1466                                  xfrm_address_t *daddr,
1467                                  xfrm_address_t *saddr, int create,
1468                                  unsigned short family);
1469 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1470 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1471                           struct flowi *fl, int family, int strict);
1472
1473 #ifdef CONFIG_XFRM_MIGRATE
1474 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1475                       struct xfrm_migrate *m, int num_bundles,
1476                       struct xfrm_kmaddress *k);
1477 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1478 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1479                                               struct xfrm_migrate *m);
1480 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1481                         struct xfrm_migrate *m, int num_bundles,
1482                         struct xfrm_kmaddress *k);
1483 #endif
1484
1485 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1486 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1487 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1488
1489 extern void xfrm_input_init(void);
1490 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1491
1492 extern void xfrm_probe_algs(void);
1493 extern int xfrm_count_auth_supported(void);
1494 extern int xfrm_count_enc_supported(void);
1495 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1496 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1497 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1498 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1499 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1500 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1501 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1502 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1503 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1504                                                    int probe);
1505
1506 struct hash_desc;
1507 struct scatterlist;
1508 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1509                               unsigned int);
1510
1511 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1512                                 int family)
1513 {
1514         switch (family) {
1515         default:
1516         case AF_INET:
1517                 return (__force u32)a->a4 - (__force u32)b->a4;
1518         case AF_INET6:
1519                 return ipv6_addr_cmp((struct in6_addr *)a,
1520                                      (struct in6_addr *)b);
1521         }
1522 }
1523
1524 static inline int xfrm_policy_id2dir(u32 index)
1525 {
1526         return index & 7;
1527 }
1528
1529 #ifdef CONFIG_XFRM
1530 static inline int xfrm_aevent_is_on(struct net *net)
1531 {
1532         struct sock *nlsk;
1533         int ret = 0;
1534
1535         rcu_read_lock();
1536         nlsk = rcu_dereference(net->xfrm.nlsk);
1537         if (nlsk)
1538                 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1539         rcu_read_unlock();
1540         return ret;
1541 }
1542 #endif
1543
1544 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1545 {
1546         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1547 }
1548
1549 static inline int xfrm_alg_auth_len(struct xfrm_algo_auth *alg)
1550 {
1551         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1552 }
1553
1554 #ifdef CONFIG_XFRM_MIGRATE
1555 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1556 {
1557         return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1558 }
1559
1560 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1561 {
1562         return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1563 }
1564
1565 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1566 {
1567         int i;
1568         for (i = 0; i < n; i++)
1569                 xfrm_state_put(*(states + i));
1570 }
1571
1572 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1573 {
1574         int i;
1575         for (i = 0; i < n; i++)
1576                 xfrm_state_delete(*(states + i));
1577 }
1578 #endif
1579
1580 #ifdef CONFIG_XFRM
1581 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1582 {
1583         return skb->sp->xvec[skb->sp->len - 1];
1584 }
1585 #endif
1586
1587 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1588 {
1589         if (attrs[XFRMA_MARK])
1590                 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(m));
1591         else
1592                 m->v = m->m = 0;
1593
1594         return m->v & m->m;
1595 }
1596
1597 static inline int xfrm_mark_put(struct sk_buff *skb, struct xfrm_mark *m)
1598 {
1599         if (m->m | m->v)
1600                 NLA_PUT(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1601         return 0;
1602
1603 nla_put_failure:
1604         return -1;
1605 }
1606
1607 #endif  /* _NET_XFRM_H */