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
  16 #include <net/sock.h>
  17 #include <net/dst.h>
  18 #include <net/ip.h>
  19 #include <net/route.h>
  20 #include <net/ipv6.h>
  21 #include <net/ip6_fib.h>
  22
  23 #include <linux/interrupt.h>
  24
  25 #ifdef CONFIG_XFRM_STATISTICS
  26 #include <net/snmp.h>
  27 #endif
  28
  29 #define XFRM_PROTO_ESP          50
  30 #define XFRM_PROTO_AH           51
  31 #define XFRM_PROTO_COMP         108
  32 #define XFRM_PROTO_IPIP         4
  33 #define XFRM_PROTO_IPV6         41
  34 #define XFRM_PROTO_ROUTING      IPPROTO_ROUTING
  35 #define XFRM_PROTO_DSTOPTS      IPPROTO_DSTOPTS
  36
  37 #define XFRM_ALIGN8(len)        (((len) + 7) & ~7)
  38 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
  39         MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
  40 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
  41         MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
  42
  43 #ifdef CONFIG_XFRM_STATISTICS
  44 #define XFRM_INC_STATS(net, field)      SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
  45 #define XFRM_INC_STATS_BH(net, field)   SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
  46 #define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
  47 #else
  48 #define XFRM_INC_STATS(net, field)      ((void)(net))
  49 #define XFRM_INC_STATS_BH(net, field)   ((void)(net))
  50 #define XFRM_INC_STATS_USER(net, field) ((void)(net))
  51 #endif
  52
  53 extern struct mutex xfrm_cfg_mutex;
  54
  55 /* Organization of SPD aka "XFRM rules"
  56    ------------------------------------
  57
  58    Basic objects:
  59    - policy rule, struct xfrm_policy (=SPD entry)
  60    - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
  61    - instance of a transformer, struct xfrm_state (=SA)
  62    - template to clone xfrm_state, struct xfrm_tmpl
  63
  64    SPD is plain linear list of xfrm_policy rules, ordered by priority.
  65    (To be compatible with existing pfkeyv2 implementations,
  66    many rules with priority of 0x7fffffff are allowed to exist and
  67    such rules are ordered in an unpredictable way, thanks to bsd folks.)
  68
  69    Lookup is plain linear search until the first match with selector.
  70
  71    If "action" is "block", then we prohibit the flow, otherwise:
  72    if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
  73    policy entry has list of up to XFRM_MAX_DEPTH transformations,
  74    described by templates xfrm_tmpl. Each template is resolved
  75    to a complete xfrm_state (see below) and we pack bundle of transformations
  76    to a dst_entry returned to requestor.
  77
  78    dst -. xfrm  .-> xfrm_state #1
  79     |---. child .-> dst -. xfrm .-> xfrm_state #2
  80                      |---. child .-> dst -. xfrm .-> xfrm_state #3
  81                                       |---. child .-> NULL
  82
  83    Bundles are cached at xrfm_policy struct (field ->bundles).
  84
  85
  86    Resolution of xrfm_tmpl
  87    -----------------------
  88    Template contains:
  89    1. ->mode            Mode: transport or tunnel
  90    2. ->id.proto        Protocol: AH/ESP/IPCOMP
  91    3. ->id.daddr        Remote tunnel endpoint, ignored for transport mode.
  92       Q: allow to resolve security gateway?
  93    4. ->id.spi          If not zero, static SPI.
  94    5. ->saddr           Local tunnel endpoint, ignored for transport mode.
  95    6. ->algos           List of allowed algos. Plain bitmask now.
  96       Q: ealgos, aalgos, calgos. What a mess...
  97    7. ->share           Sharing mode.
  98       Q: how to implement private sharing mode? To add struct sock* to
  99       flow id?
 100
 101    Having this template we search through SAD searching for entries
 102    with appropriate mode/proto/algo, permitted by selector.
 103    If no appropriate entry found, it is requested from key manager.
 104
 105    PROBLEMS:
 106    Q: How to find all the bundles referring to a physical path for
 107       PMTU discovery? Seems, dst should contain list of all parents...
 108       and enter to infinite locking hierarchy disaster.
 109       No! It is easier, we will not search for them, let them find us.
 110       We add genid to each dst plus pointer to genid of raw IP route,
 111       pmtu disc will update pmtu on raw IP route and increase its genid.
 112       dst_check() will see this for top level and trigger resyncing
 113       metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
 114  */
 115
 116 struct xfrm_state_walk {
 117         struct list_head        all;
 118         u8                      state;
 119         union {
 120                 u8              dying;
 121                 u8              proto;
 122         };
 123         u32                     seq;
 124 };
 125
 126 /* Full description of state of transformer. */
 127 struct xfrm_state {
 128 #ifdef CONFIG_NET_NS
 129         struct net              *xs_net;
 130 #endif
 131         union {
 132                 struct hlist_node       gclist;
 133                 struct hlist_node       bydst;
 134         };
 135         struct hlist_node       bysrc;
 136         struct hlist_node       byspi;
 137
 138         atomic_t                refcnt;
 139         spinlock_t              lock;
 140
 141         struct xfrm_id          id;
 142         struct xfrm_selector    sel;
 143         struct xfrm_mark        mark;
 144
 145         u32                     genid;
 146
 147         /* Key manager bits */
 148         struct xfrm_state_walk  km;
 149
 150         /* Parameters of this state. */
 151         struct {
 152                 u32             reqid;
 153                 u8              mode;
 154                 u8              replay_window;
 155                 u8              aalgo, ealgo, calgo;
 156                 u8              flags;
 157                 u16             family;
 158                 xfrm_address_t  saddr;
 159                 int             header_len;
 160                 int             trailer_len;
 161         } props;
 162
 163         struct xfrm_lifetime_cfg lft;
 164
 165         /* Data for transformer */
 166         struct xfrm_algo_auth   *aalg;
 167         struct xfrm_algo        *ealg;
 168         struct xfrm_algo        *calg;
 169         struct xfrm_algo_aead   *aead;
 170
 171         /* Data for encapsulator */
 172         struct xfrm_encap_tmpl  *encap;
 173
 174         /* Data for care-of address */
 175         xfrm_address_t  *coaddr;
 176
 177         /* IPComp needs an IPIP tunnel for handling uncompressed packets */
 178         struct xfrm_state       *tunnel;
 179
 180         /* If a tunnel, number of users + 1 */
 181         atomic_t                tunnel_users;
 182
 183         /* State for replay detection */
 184         struct xfrm_replay_state replay;
 185
 186         /* Replay detection state at the time we sent the last notification */
 187         struct xfrm_replay_state preplay;
 188
 189         /* internal flag that only holds state for delayed aevent at the
 190          * moment
 191         */
 192         u32                     xflags;
 193
 194         /* Replay detection notification settings */
 195         u32                     replay_maxage;
 196         u32                     replay_maxdiff;
 197
 198         /* Replay detection notification timer */
 199         struct timer_list       rtimer;
 200
 201         /* Statistics */
 202         struct xfrm_stats       stats;
 203
 204         struct xfrm_lifetime_cur curlft;
 205         struct tasklet_hrtimer  mtimer;
 206
 207         /* Last used time */
 208         unsigned long           lastused;
 209
 210         /* Reference to data common to all the instances of this
 211          * transformer. */
 212         const struct xfrm_type  *type;
 213         struct xfrm_mode        *inner_mode;
 214         struct xfrm_mode        *inner_mode_iaf;
 215         struct xfrm_mode        *outer_mode;
 216
 217         /* Security context */
 218         struct xfrm_sec_ctx     *security;
 219
 220         /* Private data of this transformer, format is opaque,
 221          * interpreted by xfrm_type methods. */
 222         void                    *data;
 223 };
 224
 225 static inline struct net *xs_net(struct xfrm_state *x)
 226 {
 227         return read_pnet(&x->xs_net);
 228 }
 229
 230 /* xflags - make enum if more show up */
 231 #define XFRM_TIME_DEFER 1
 232
 233 enum {
 234         XFRM_STATE_VOID,
 235         XFRM_STATE_ACQ,
 236         XFRM_STATE_VALID,
 237         XFRM_STATE_ERROR,
 238         XFRM_STATE_EXPIRED,
 239         XFRM_STATE_DEAD
 240 };
 241
 242 /* callback structure passed from either netlink or pfkey */
 243 struct km_event {
 244         union {
 245                 u32 hard;
 246                 u32 proto;
 247                 u32 byid;
 248                 u32 aevent;
 249                 u32 type;
 250         } data;
 251
 252         u32     seq;
 253         u32     pid;
 254         u32     event;
 255         struct net *net;
 256 };
 257
 258 struct net_device;
 259 struct xfrm_type;
 260 struct xfrm_dst;
 261 struct xfrm_policy_afinfo {
 262         unsigned short          family;
 263         struct dst_ops          *dst_ops;
 264         void                    (*garbage_collect)(struct net *net);
 265         struct dst_entry        *(*dst_lookup)(struct net *net, int tos,
 266                                                xfrm_address_t *saddr,
 267                                                xfrm_address_t *daddr);
 268         int                     (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
 269         struct dst_entry        *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
 270         void                    (*decode_session)(struct sk_buff *skb,
 271                                                   struct flowi *fl,
 272                                                   int reverse);
 273         int                     (*get_tos)(struct flowi *fl);
 274         int                     (*init_path)(struct xfrm_dst *path,
 275                                              struct dst_entry *dst,
 276                                              int nfheader_len);
 277         int                     (*fill_dst)(struct xfrm_dst *xdst,
 278                                             struct net_device *dev,
 279                                             struct flowi *fl);
 280 };
 281
 282 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
 283 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
 284 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
 285 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
 286
 287 struct xfrm_tmpl;
 288 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
 289 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
 290 extern int __xfrm_state_delete(struct xfrm_state *x);
 291
 292 struct xfrm_state_afinfo {
 293         unsigned int            family;
 294         unsigned int            proto;
 295         __be16                  eth_proto;
 296         struct module           *owner;
 297         const struct xfrm_type  *type_map[IPPROTO_MAX];
 298         struct xfrm_mode        *mode_map[XFRM_MODE_MAX];
 299         int                     (*init_flags)(struct xfrm_state *x);
 300         void                    (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
 301                                                 struct xfrm_tmpl *tmpl,
 302                                                 xfrm_address_t *daddr, xfrm_address_t *saddr);
 303         int                     (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
 304         int                     (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
 305         int                     (*output)(struct sk_buff *skb);
 306         int                     (*extract_input)(struct xfrm_state *x,
 307                                                  struct sk_buff *skb);
 308         int                     (*extract_output)(struct xfrm_state *x,
 309                                                   struct sk_buff *skb);
 310         int                     (*transport_finish)(struct sk_buff *skb,
 311                                                     int async);
 312 };
 313
 314 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
 315 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
 316
 317 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
 318
 319 struct xfrm_type {
 320         char                    *description;
 321         struct module           *owner;
 322         u8                      proto;
 323         u8                      flags;
 324 #define XFRM_TYPE_NON_FRAGMENT  1
 325 #define XFRM_TYPE_REPLAY_PROT   2
 326 #define XFRM_TYPE_LOCAL_COADDR  4
 327 #define XFRM_TYPE_REMOTE_COADDR 8
 328
 329         int                     (*init_state)(struct xfrm_state *x);
 330         void                    (*destructor)(struct xfrm_state *);
 331         int                     (*input)(struct xfrm_state *, struct sk_buff *skb);
 332         int                     (*output)(struct xfrm_state *, struct sk_buff *pskb);
 333         int                     (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
 334         int                     (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
 335         /* Estimate maximal size of result of transformation of a dgram */
 336         u32                     (*get_mtu)(struct xfrm_state *, int size);
 337 };
 338
 339 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
 340 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
 341
 342 struct xfrm_mode {
 343         /*
 344          * Remove encapsulation header.
 345          *
 346          * The IP header will be moved over the top of the encapsulation
 347          * header.
 348          *
 349          * On entry, the transport header shall point to where the IP header
 350          * should be and the network header shall be set to where the IP
 351          * header currently is.  skb->data shall point to the start of the
 352          * payload.
 353          */
 354         int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
 355
 356         /*
 357          * This is the actual input entry point.
 358          *
 359          * For transport mode and equivalent this would be identical to
 360          * input2 (which does not need to be set).  While tunnel mode
 361          * and equivalent would set this to the tunnel encapsulation function
 362          * xfrm4_prepare_input that would in turn call input2.
 363          */
 364         int (*input)(struct xfrm_state *x, struct sk_buff *skb);
 365
 366         /*
 367          * Add encapsulation header.
 368          *
 369          * On exit, the transport header will be set to the start of the
 370          * encapsulation header to be filled in by x->type->output and
 371          * the mac header will be set to the nextheader (protocol for
 372          * IPv4) field of the extension header directly preceding the
 373          * encapsulation header, or in its absence, that of the top IP
 374          * header.  The value of the network header will always point
 375          * to the top IP header while skb->data will point to the payload.
 376          */
 377         int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
 378
 379         /*
 380          * This is the actual output entry point.
 381          *
 382          * For transport mode and equivalent this would be identical to
 383          * output2 (which does not need to be set).  While tunnel mode
 384          * and equivalent would set this to a tunnel encapsulation function
 385          * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
 386          * call output2.
 387          */
 388         int (*output)(struct xfrm_state *x, struct sk_buff *skb);
 389
 390         struct xfrm_state_afinfo *afinfo;
 391         struct module *owner;
 392         unsigned int encap;
 393         int flags;
 394 };
 395
 396 /* Flags for xfrm_mode. */
 397 enum {
 398         XFRM_MODE_FLAG_TUNNEL = 1,
 399 };
 400
 401 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
 402 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
 403
 404 static inline int xfrm_af2proto(unsigned int family)
 405 {
 406         switch(family) {
 407         case AF_INET:
 408                 return IPPROTO_IPIP;
 409         case AF_INET6:
 410                 return IPPROTO_IPV6;
 411         default:
 412                 return 0;
 413         }
 414 }
 415
 416 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
 417 {
 418         if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
 419             (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
 420                 return x->inner_mode;
 421         else
 422                 return x->inner_mode_iaf;
 423 }
 424
 425 struct xfrm_tmpl {
 426 /* id in template is interpreted as:
 427  * daddr - destination of tunnel, may be zero for transport mode.
 428  * spi   - zero to acquire spi. Not zero if spi is static, then
 429  *         daddr must be fixed too.
 430  * proto - AH/ESP/IPCOMP
 431  */
 432         struct xfrm_id          id;
 433
 434 /* Source address of tunnel. Ignored, if it is not a tunnel. */
 435         xfrm_address_t          saddr;
 436
 437         unsigned short          encap_family;
 438
 439         u32                     reqid;
 440
 441 /* Mode: transport, tunnel etc. */
 442         u8                      mode;
 443
 444 /* Sharing mode: unique, this session only, this user only etc. */
 445         u8                      share;
 446
 447 /* May skip this transfomration if no SA is found */
 448         u8                      optional;
 449
 450 /* Skip aalgos/ealgos/calgos checks. */
 451         u8                      allalgs;
 452
 453 /* Bit mask of algos allowed for acquisition */
 454         u32                     aalgos;
 455         u32                     ealgos;
 456         u32                     calgos;
 457 };
 458
 459 #define XFRM_MAX_DEPTH          6
 460
 461 struct xfrm_policy_walk_entry {
 462         struct list_head        all;
 463         u8                      dead;
 464 };
 465
 466 struct xfrm_policy_walk {
 467         struct xfrm_policy_walk_entry walk;
 468         u8 type;
 469         u32 seq;
 470 };
 471
 472 struct xfrm_policy {
 473 #ifdef CONFIG_NET_NS
 474         struct net              *xp_net;
 475 #endif
 476         struct hlist_node       bydst;
 477         struct hlist_node       byidx;
 478
 479         /* This lock only affects elements except for entry. */
 480         rwlock_t                lock;
 481         atomic_t                refcnt;
 482         struct timer_list       timer;
 483
 484         u32                     priority;
 485         u32                     index;
 486         struct xfrm_mark        mark;
 487         struct xfrm_selector    selector;
 488         struct xfrm_lifetime_cfg lft;
 489         struct xfrm_lifetime_cur curlft;
 490         struct dst_entry       *bundles;
 491         struct xfrm_policy_walk_entry walk;
 492         u8                      type;
 493         u8                      action;
 494         u8                      flags;
 495         u8                      xfrm_nr;
 496         u16                     family;
 497         struct xfrm_sec_ctx     *security;
 498         struct xfrm_tmpl        xfrm_vec[XFRM_MAX_DEPTH];
 499 };
 500
 501 static inline struct net *xp_net(struct xfrm_policy *xp)
 502 {
 503         return read_pnet(&xp->xp_net);
 504 }
 505
 506 struct xfrm_kmaddress {
 507         xfrm_address_t          local;
 508         xfrm_address_t          remote;
 509         u32                     reserved;
 510         u16                     family;
 511 };
 512
 513 struct xfrm_migrate {
 514         xfrm_address_t          old_daddr;
 515         xfrm_address_t          old_saddr;
 516         xfrm_address_t          new_daddr;
 517         xfrm_address_t          new_saddr;
 518         u8                      proto;
 519         u8                      mode;
 520         u16                     reserved;
 521         u32                     reqid;
 522         u16                     old_family;
 523         u16                     new_family;
 524 };
 525
 526 #define XFRM_KM_TIMEOUT                30
 527 /* which seqno */
 528 #define XFRM_REPLAY_SEQ         1
 529 #define XFRM_REPLAY_OSEQ        2
 530 #define XFRM_REPLAY_SEQ_MASK    3
 531 /* what happened */
 532 #define XFRM_REPLAY_UPDATE      XFRM_AE_CR
 533 #define XFRM_REPLAY_TIMEOUT     XFRM_AE_CE
 534
 535 /* default aevent timeout in units of 100ms */
 536 #define XFRM_AE_ETIME                   10
 537 /* Async Event timer multiplier */
 538 #define XFRM_AE_ETH_M                   10
 539 /* default seq threshold size */
 540 #define XFRM_AE_SEQT_SIZE               2
 541
 542 struct xfrm_mgr {
 543         struct list_head        list;
 544         char                    *id;
 545         int                     (*notify)(struct xfrm_state *x, struct km_event *c);
 546         int                     (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
 547         struct xfrm_policy      *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
 548         int                     (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
 549         int                     (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
 550         int                     (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
 551         int                     (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
 552 };
 553
 554 extern int xfrm_register_km(struct xfrm_mgr *km);
 555 extern int xfrm_unregister_km(struct xfrm_mgr *km);
 556
 557 /*
 558  * This structure is used for the duration where packets are being
 559  * transformed by IPsec.  As soon as the packet leaves IPsec the
 560  * area beyond the generic IP part may be overwritten.
 561  */
 562 struct xfrm_skb_cb {
 563         union {
 564                 struct inet_skb_parm h4;
 565                 struct inet6_skb_parm h6;
 566         } header;
 567
 568         /* Sequence number for replay protection. */
 569         union {
 570                 u64 output;
 571                 __be32 input;
 572         } seq;
 573 };
 574
 575 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
 576
 577 /*
 578  * This structure is used by the afinfo prepare_input/prepare_output functions
 579  * to transmit header information to the mode input/output functions.
 580  */
 581 struct xfrm_mode_skb_cb {
 582         union {
 583                 struct inet_skb_parm h4;
 584                 struct inet6_skb_parm h6;
 585         } header;
 586
 587         /* Copied from header for IPv4, always set to zero and DF for IPv6. */
 588         __be16 id;
 589         __be16 frag_off;
 590
 591         /* IP header length (excluding options or extension headers). */
 592         u8 ihl;
 593
 594         /* TOS for IPv4, class for IPv6. */
 595         u8 tos;
 596
 597         /* TTL for IPv4, hop limitfor IPv6. */
 598         u8 ttl;
 599
 600         /* Protocol for IPv4, NH for IPv6. */
 601         u8 protocol;
 602
 603         /* Option length for IPv4, zero for IPv6. */
 604         u8 optlen;
 605
 606         /* Used by IPv6 only, zero for IPv4. */
 607         u8 flow_lbl[3];
 608 };
 609
 610 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
 611
 612 /*
 613  * This structure is used by the input processing to locate the SPI and
 614  * related information.
 615  */
 616 struct xfrm_spi_skb_cb {
 617         union {
 618                 struct inet_skb_parm h4;
 619                 struct inet6_skb_parm h6;
 620         } header;
 621
 622         unsigned int daddroff;
 623         unsigned int family;
 624 };
 625
 626 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
 627
 628 /* Audit Information */
 629 struct xfrm_audit {
 630         u32     secid;
 631         uid_t   loginuid;
 632         u32     sessionid;
 633 };
 634
 635 #ifdef CONFIG_AUDITSYSCALL
 636 static inline struct audit_buffer *xfrm_audit_start(const char *op)
 637 {
 638         struct audit_buffer *audit_buf = NULL;
 639
 640         if (audit_enabled == 0)
 641                 return NULL;
 642         audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
 643                                     AUDIT_MAC_IPSEC_EVENT);
 644         if (audit_buf == NULL)
 645                 return NULL;
 646         audit_log_format(audit_buf, "op=%s", op);
 647         return audit_buf;
 648 }
 649
 650 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
 651                                              struct audit_buffer *audit_buf)
 652 {
 653         char *secctx;
 654         u32 secctx_len;
 655
 656         audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
 657         if (secid != 0 &&
 658             security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
 659                 audit_log_format(audit_buf, " subj=%s", secctx);
 660                 security_release_secctx(secctx, secctx_len);
 661         } else
 662                 audit_log_task_context(audit_buf);
 663 }
 664
 665 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 666                                   u32 auid, u32 ses, u32 secid);
 667 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 668                                   u32 auid, u32 ses, u32 secid);
 669 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
 670                                  u32 auid, u32 ses, u32 secid);
 671 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 672                                     u32 auid, u32 ses, u32 secid);
 673 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 674                                              struct sk_buff *skb);
 675 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
 676 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 677                                       __be32 net_spi, __be32 net_seq);
 678 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
 679                                      struct sk_buff *skb, u8 proto);
 680 #else
 681
 682 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 683                                   u32 auid, u32 ses, u32 secid)
 684 {
 685 }
 686
 687 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 688                                   u32 auid, u32 ses, u32 secid)
 689 {
 690 }
 691
 692 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
 693                                  u32 auid, u32 ses, u32 secid)
 694 {
 695 }
 696
 697 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 698                                     u32 auid, u32 ses, u32 secid)
 699 {
 700 }
 701
 702 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 703                                              struct sk_buff *skb)
 704 {
 705 }
 706
 707 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
 708                                       u16 family)
 709 {
 710 }
 711
 712 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 713                                       __be32 net_spi, __be32 net_seq)
 714 {
 715 }
 716
 717 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
 718                                      struct sk_buff *skb, u8 proto)
 719 {
 720 }
 721 #endif /* CONFIG_AUDITSYSCALL */
 722
 723 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
 724 {
 725         if (likely(policy != NULL))
 726                 atomic_inc(&policy->refcnt);
 727 }
 728
 729 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
 730
 731 static inline void xfrm_pol_put(struct xfrm_policy *policy)
 732 {
 733         if (atomic_dec_and_test(&policy->refcnt))
 734                 xfrm_policy_destroy(policy);
 735 }
 736
 737 #ifdef CONFIG_XFRM_SUB_POLICY
 738 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 739 {
 740         int i;
 741         for (i = npols - 1; i >= 0; --i)
 742                 xfrm_pol_put(pols[i]);
 743 }
 744 #else
 745 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 746 {
 747         xfrm_pol_put(pols[0]);
 748 }
 749 #endif
 750
 751 extern void __xfrm_state_destroy(struct xfrm_state *);
 752
 753 static inline void __xfrm_state_put(struct xfrm_state *x)
 754 {
 755         atomic_dec(&x->refcnt);
 756 }
 757
 758 static inline void xfrm_state_put(struct xfrm_state *x)
 759 {
 760         if (atomic_dec_and_test(&x->refcnt))
 761                 __xfrm_state_destroy(x);
 762 }
 763
 764 static inline void xfrm_state_hold(struct xfrm_state *x)
 765 {
 766         atomic_inc(&x->refcnt);
 767 }
 768
 769 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
 770 {
 771         __be32 *a1 = token1;
 772         __be32 *a2 = token2;
 773         int pdw;
 774         int pbi;
 775
 776         pdw = prefixlen >> 5;     /* num of whole u32 in prefix */
 777         pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
 778
 779         if (pdw)
 780                 if (memcmp(a1, a2, pdw << 2))
 781                         return 0;
 782
 783         if (pbi) {
 784                 __be32 mask;
 785
 786                 mask = htonl((0xffffffff) << (32 - pbi));
 787
 788                 if ((a1[pdw] ^ a2[pdw]) & mask)
 789                         return 0;
 790         }
 791
 792         return 1;
 793 }
 794
 795 static __inline__
 796 __be16 xfrm_flowi_sport(struct flowi *fl)
 797 {
 798         __be16 port;
 799         switch(fl->proto) {
 800         case IPPROTO_TCP:
 801         case IPPROTO_UDP:
 802         case IPPROTO_UDPLITE:
 803         case IPPROTO_SCTP:
 804                 port = fl->fl_ip_sport;
 805                 break;
 806         case IPPROTO_ICMP:
 807         case IPPROTO_ICMPV6:
 808                 port = htons(fl->fl_icmp_type);
 809                 break;
 810         case IPPROTO_MH:
 811                 port = htons(fl->fl_mh_type);
 812                 break;
 813         default:
 814                 port = 0;       /*XXX*/
 815         }
 816         return port;
 817 }
 818
 819 static __inline__
 820 __be16 xfrm_flowi_dport(struct flowi *fl)
 821 {
 822         __be16 port;
 823         switch(fl->proto) {
 824         case IPPROTO_TCP:
 825         case IPPROTO_UDP:
 826         case IPPROTO_UDPLITE:
 827         case IPPROTO_SCTP:
 828                 port = fl->fl_ip_dport;
 829                 break;
 830         case IPPROTO_ICMP:
 831         case IPPROTO_ICMPV6:
 832                 port = htons(fl->fl_icmp_code);
 833                 break;
 834         default:
 835                 port = 0;       /*XXX*/
 836         }
 837         return port;
 838 }
 839
 840 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
 841                                unsigned short family);
 842
 843 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 844 /*      If neither has a context --> match
 845  *      Otherwise, both must have a context and the sids, doi, alg must match
 846  */
 847 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 848 {
 849         return ((!s1 && !s2) ||
 850                 (s1 && s2 &&
 851                  (s1->ctx_sid == s2->ctx_sid) &&
 852                  (s1->ctx_doi == s2->ctx_doi) &&
 853                  (s1->ctx_alg == s2->ctx_alg)));
 854 }
 855 #else
 856 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 857 {
 858         return 1;
 859 }
 860 #endif
 861
 862 /* A struct encoding bundle of transformations to apply to some set of flow.
 863  *
 864  * dst->child points to the next element of bundle.
 865  * dst->xfrm  points to an instanse of transformer.
 866  *
 867  * Due to unfortunate limitations of current routing cache, which we
 868  * have no time to fix, it mirrors struct rtable and bound to the same
 869  * routing key, including saddr,daddr. However, we can have many of
 870  * bundles differing by session id. All the bundles grow from a parent
 871  * policy rule.
 872  */
 873 struct xfrm_dst {
 874         union {
 875                 struct dst_entry        dst;
 876                 struct rtable           rt;
 877                 struct rt6_info         rt6;
 878         } u;
 879         struct dst_entry *route;
 880 #ifdef CONFIG_XFRM_SUB_POLICY
 881         struct flowi *origin;
 882         struct xfrm_selector *partner;
 883 #endif
 884         u32 genid;
 885         u32 route_mtu_cached;
 886         u32 child_mtu_cached;
 887         u32 route_cookie;
 888         u32 path_cookie;
 889 };
 890
 891 #ifdef CONFIG_XFRM
 892 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
 893 {
 894         dst_release(xdst->route);
 895         if (likely(xdst->u.dst.xfrm))
 896                 xfrm_state_put(xdst->u.dst.xfrm);
 897 #ifdef CONFIG_XFRM_SUB_POLICY
 898         kfree(xdst->origin);
 899         xdst->origin = NULL;
 900         kfree(xdst->partner);
 901         xdst->partner = NULL;
 902 #endif
 903 }
 904 #endif
 905
 906 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
 907
 908 struct sec_path {
 909         atomic_t                refcnt;
 910         int                     len;
 911         struct xfrm_state       *xvec[XFRM_MAX_DEPTH];
 912 };
 913
 914 static inline struct sec_path *
 915 secpath_get(struct sec_path *sp)
 916 {
 917         if (sp)
 918                 atomic_inc(&sp->refcnt);
 919         return sp;
 920 }
 921
 922 extern void __secpath_destroy(struct sec_path *sp);
 923
 924 static inline void
 925 secpath_put(struct sec_path *sp)
 926 {
 927         if (sp && atomic_dec_and_test(&sp->refcnt))
 928                 __secpath_destroy(sp);
 929 }
 930
 931 extern struct sec_path *secpath_dup(struct sec_path *src);
 932
 933 static inline void
 934 secpath_reset(struct sk_buff *skb)
 935 {
 936 #ifdef CONFIG_XFRM
 937         secpath_put(skb->sp);
 938         skb->sp = NULL;
 939 #endif
 940 }
 941
 942 static inline int
 943 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
 944 {
 945         switch (family) {
 946         case AF_INET:
 947                 return addr->a4 == 0;
 948         case AF_INET6:
 949                 return ipv6_addr_any((struct in6_addr *)&addr->a6);
 950         }
 951         return 0;
 952 }
 953
 954 static inline int
 955 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 956 {
 957         return  (tmpl->saddr.a4 &&
 958                  tmpl->saddr.a4 != x->props.saddr.a4);
 959 }
 960
 961 static inline int
 962 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 963 {
 964         return  (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
 965                  ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
 966 }
 967
 968 static inline int
 969 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
 970 {
 971         switch (family) {
 972         case AF_INET:
 973                 return __xfrm4_state_addr_cmp(tmpl, x);
 974         case AF_INET6:
 975                 return __xfrm6_state_addr_cmp(tmpl, x);
 976         }
 977         return !0;
 978 }
 979
 980 #ifdef CONFIG_XFRM
 981 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
 982
 983 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
 984                                        struct sk_buff *skb,
 985                                        unsigned int family, int reverse)
 986 {
 987         struct net *net = dev_net(skb->dev);
 988         int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
 989
 990         if (sk && sk->sk_policy[XFRM_POLICY_IN])
 991                 return __xfrm_policy_check(sk, ndir, skb, family);
 992
 993         return  (!net->xfrm.policy_count[dir] && !skb->sp) ||
 994                 (skb_dst(skb)->flags & DST_NOPOLICY) ||
 995                 __xfrm_policy_check(sk, ndir, skb, family);
 996 }
 997
 998 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
 999 {
1000         return __xfrm_policy_check2(sk, dir, skb, family, 0);
1001 }
1002
1003 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1004 {
1005         return xfrm_policy_check(sk, dir, skb, AF_INET);
1006 }
1007
1008 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1009 {
1010         return xfrm_policy_check(sk, dir, skb, AF_INET6);
1011 }
1012
1013 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1014                                              struct sk_buff *skb)
1015 {
1016         return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1017 }
1018
1019 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1020                                              struct sk_buff *skb)
1021 {
1022         return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1023 }
1024
1025 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1026                                  unsigned int family, int reverse);
1027
1028 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1029                                       unsigned int family)
1030 {
1031         return __xfrm_decode_session(skb, fl, family, 0);
1032 }
1033
1034 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1035                                               struct flowi *fl,
1036                                               unsigned int family)
1037 {
1038         return __xfrm_decode_session(skb, fl, family, 1);
1039 }
1040
1041 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1042
1043 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1044 {
1045         struct net *net = dev_net(skb->dev);
1046
1047         return  !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1048                 (skb_dst(skb)->flags & DST_NOXFRM) ||
1049                 __xfrm_route_forward(skb, family);
1050 }
1051
1052 static inline int xfrm4_route_forward(struct sk_buff *skb)
1053 {
1054         return xfrm_route_forward(skb, AF_INET);
1055 }
1056
1057 static inline int xfrm6_route_forward(struct sk_buff *skb)
1058 {
1059         return xfrm_route_forward(skb, AF_INET6);
1060 }
1061
1062 extern int __xfrm_sk_clone_policy(struct sock *sk);
1063
1064 static inline int xfrm_sk_clone_policy(struct sock *sk)
1065 {
1066         if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1067                 return __xfrm_sk_clone_policy(sk);
1068         return 0;
1069 }
1070
1071 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1072
1073 static inline void xfrm_sk_free_policy(struct sock *sk)
1074 {
1075         if (unlikely(sk->sk_policy[0] != NULL)) {
1076                 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1077                 sk->sk_policy[0] = NULL;
1078         }
1079         if (unlikely(sk->sk_policy[1] != NULL)) {
1080                 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1081                 sk->sk_policy[1] = NULL;
1082         }
1083 }
1084
1085 #else
1086
1087 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1088 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1089 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1090 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1091 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1092 {
1093         return 1;
1094 }
1095 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1096 {
1097         return 1;
1098 }
1099 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1100 {
1101         return 1;
1102 }
1103 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1104                                               struct flowi *fl,
1105                                               unsigned int family)
1106 {
1107         return -ENOSYS;
1108 }
1109 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1110                                              struct sk_buff *skb)
1111 {
1112         return 1;
1113 }
1114 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1115                                              struct sk_buff *skb)
1116 {
1117         return 1;
1118 }
1119 #endif
1120
1121 static __inline__
1122 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1123 {
1124         switch (family){
1125         case AF_INET:
1126                 return (xfrm_address_t *)&fl->fl4_dst;
1127         case AF_INET6:
1128                 return (xfrm_address_t *)&fl->fl6_dst;
1129         }
1130         return NULL;
1131 }
1132
1133 static __inline__
1134 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1135 {
1136         switch (family){
1137         case AF_INET:
1138                 return (xfrm_address_t *)&fl->fl4_src;
1139         case AF_INET6:
1140                 return (xfrm_address_t *)&fl->fl6_src;
1141         }
1142         return NULL;
1143 }
1144
1145 static __inline__
1146 void xfrm_flowi_addr_get(struct flowi *fl,
1147                          xfrm_address_t *saddr, xfrm_address_t *daddr,
1148                          unsigned short family)
1149 {
1150         switch(family) {
1151         case AF_INET:
1152                 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1153                 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1154                 break;
1155         case AF_INET6:
1156                 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1157                 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1158                 break;
1159         }
1160 }
1161
1162 static __inline__ int
1163 __xfrm4_state_addr_check(struct xfrm_state *x,
1164                          xfrm_address_t *daddr, xfrm_address_t *saddr)
1165 {
1166         if (daddr->a4 == x->id.daddr.a4 &&
1167             (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1168                 return 1;
1169         return 0;
1170 }
1171
1172 static __inline__ int
1173 __xfrm6_state_addr_check(struct xfrm_state *x,
1174                          xfrm_address_t *daddr, xfrm_address_t *saddr)
1175 {
1176         if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1177             (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1178              ipv6_addr_any((struct in6_addr *)saddr) ||
1179              ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1180                 return 1;
1181         return 0;
1182 }
1183
1184 static __inline__ int
1185 xfrm_state_addr_check(struct xfrm_state *x,
1186                       xfrm_address_t *daddr, xfrm_address_t *saddr,
1187                       unsigned short family)
1188 {
1189         switch (family) {
1190         case AF_INET:
1191                 return __xfrm4_state_addr_check(x, daddr, saddr);
1192         case AF_INET6:
1193                 return __xfrm6_state_addr_check(x, daddr, saddr);
1194         }
1195         return 0;
1196 }
1197
1198 static __inline__ int
1199 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1200                            unsigned short family)
1201 {
1202         switch (family) {
1203         case AF_INET:
1204                 return __xfrm4_state_addr_check(x,
1205                                                 (xfrm_address_t *)&fl->fl4_dst,
1206                                                 (xfrm_address_t *)&fl->fl4_src);
1207         case AF_INET6:
1208                 return __xfrm6_state_addr_check(x,
1209                                                 (xfrm_address_t *)&fl->fl6_dst,
1210                                                 (xfrm_address_t *)&fl->fl6_src);
1211         }
1212         return 0;
1213 }
1214
1215 static inline int xfrm_state_kern(struct xfrm_state *x)
1216 {
1217         return atomic_read(&x->tunnel_users);
1218 }
1219
1220 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1221 {
1222         return (!userproto || proto == userproto ||
1223                 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1224                                                   proto == IPPROTO_ESP ||
1225                                                   proto == IPPROTO_COMP)));
1226 }
1227
1228 /*
1229  * xfrm algorithm information
1230  */
1231 struct xfrm_algo_aead_info {
1232         u16 icv_truncbits;
1233 };
1234
1235 struct xfrm_algo_auth_info {
1236         u16 icv_truncbits;
1237         u16 icv_fullbits;
1238 };
1239
1240 struct xfrm_algo_encr_info {
1241         u16 blockbits;
1242         u16 defkeybits;
1243 };
1244
1245 struct xfrm_algo_comp_info {
1246         u16 threshold;
1247 };
1248
1249 struct xfrm_algo_desc {
1250         char *name;
1251         char *compat;
1252         u8 available:1;
1253         union {
1254                 struct xfrm_algo_aead_info aead;
1255                 struct xfrm_algo_auth_info auth;
1256                 struct xfrm_algo_encr_info encr;
1257                 struct xfrm_algo_comp_info comp;
1258         } uinfo;
1259         struct sadb_alg desc;
1260 };
1261
1262 /* XFRM tunnel handlers.  */
1263 struct xfrm_tunnel {
1264         int (*handler)(struct sk_buff *skb);
1265         int (*err_handler)(struct sk_buff *skb, u32 info);
1266
1267         struct xfrm_tunnel *next;
1268         int priority;
1269 };
1270
1271 struct xfrm6_tunnel {
1272         int (*handler)(struct sk_buff *skb);
1273         int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1274                            u8 type, u8 code, int offset, __be32 info);
1275         struct xfrm6_tunnel *next;
1276         int priority;
1277 };
1278
1279 extern void xfrm_init(void);
1280 extern void xfrm4_init(int rt_hash_size);
1281 extern int xfrm_state_init(struct net *net);
1282 extern void xfrm_state_fini(struct net *net);
1283 extern void xfrm4_state_init(void);
1284 #ifdef CONFIG_XFRM
1285 extern int xfrm6_init(void);
1286 extern void xfrm6_fini(void);
1287 extern int xfrm6_state_init(void);
1288 extern void xfrm6_state_fini(void);
1289 #else
1290 static inline int xfrm6_init(void)
1291 {
1292         return 0;
1293 }
1294 static inline void xfrm6_fini(void)
1295 {
1296         ;
1297 }
1298 #endif
1299
1300 #ifdef CONFIG_XFRM_STATISTICS
1301 extern int xfrm_proc_init(struct net *net);
1302 extern void xfrm_proc_fini(struct net *net);
1303 #endif
1304
1305 extern int xfrm_sysctl_init(struct net *net);
1306 #ifdef CONFIG_SYSCTL
1307 extern void xfrm_sysctl_fini(struct net *net);
1308 #else
1309 static inline void xfrm_sysctl_fini(struct net *net)
1310 {
1311 }
1312 #endif
1313
1314 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1315 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1316                            int (*func)(struct xfrm_state *, int, void*), void *);
1317 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1318 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1319 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1320                                           struct flowi *fl, struct xfrm_tmpl *tmpl,
1321                                           struct xfrm_policy *pol, int *err,
1322                                           unsigned short family);
1323 extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1324                                                xfrm_address_t *daddr,
1325                                                xfrm_address_t *saddr,
1326                                                unsigned short family,
1327                                                u8 mode, u8 proto, u32 reqid);
1328 extern int xfrm_state_check_expire(struct xfrm_state *x);
1329 extern void xfrm_state_insert(struct xfrm_state *x);
1330 extern int xfrm_state_add(struct xfrm_state *x);
1331 extern int xfrm_state_update(struct xfrm_state *x);
1332 extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1333                                             xfrm_address_t *daddr, __be32 spi,
1334                                             u8 proto, unsigned short family);
1335 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1336                                                    xfrm_address_t *daddr,
1337                                                    xfrm_address_t *saddr,
1338                                                    u8 proto,
1339                                                    unsigned short family);
1340 #ifdef CONFIG_XFRM_SUB_POLICY
1341 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1342                           int n, unsigned short family);
1343 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1344                            int n, unsigned short family);
1345 #else
1346 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1347                                  int n, unsigned short family)
1348 {
1349         return -ENOSYS;
1350 }
1351
1352 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1353                                   int n, unsigned short family)
1354 {
1355         return -ENOSYS;
1356 }
1357 #endif
1358
1359 struct xfrmk_sadinfo {
1360         u32 sadhcnt; /* current hash bkts */
1361         u32 sadhmcnt; /* max allowed hash bkts */
1362         u32 sadcnt; /* current running count */
1363 };
1364
1365 struct xfrmk_spdinfo {
1366         u32 incnt;
1367         u32 outcnt;
1368         u32 fwdcnt;
1369         u32 inscnt;
1370         u32 outscnt;
1371         u32 fwdscnt;
1372         u32 spdhcnt;
1373         u32 spdhmcnt;
1374 };
1375
1376 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark,
1377                                               u32 seq);
1378 extern int xfrm_state_delete(struct xfrm_state *x);
1379 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1380 extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1381 extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1382 extern int xfrm_replay_check(struct xfrm_state *x,
1383                              struct sk_buff *skb, __be32 seq);
1384 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1385 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1386 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1387 extern int xfrm_init_state(struct xfrm_state *x);
1388 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1389 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1390                       int encap_type);
1391 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1392 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1393 extern int xfrm_output(struct sk_buff *skb);
1394 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1395 extern int xfrm4_extract_header(struct sk_buff *skb);
1396 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1397 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1398                            int encap_type);
1399 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1400 extern int xfrm4_rcv(struct sk_buff *skb);
1401
1402 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1403 {
1404         return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1405 }
1406
1407 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1408 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1409 extern int xfrm4_output(struct sk_buff *skb);
1410 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1411 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1412 extern int xfrm6_extract_header(struct sk_buff *skb);
1413 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1414 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1415 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1416 extern int xfrm6_rcv(struct sk_buff *skb);
1417 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1418                             xfrm_address_t *saddr, u8 proto);
1419 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1420 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1421 extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1422 extern void xfrm6_tunnel_free_spi(struct net *net, xfrm_address_t *saddr);
1423 extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, xfrm_address_t *saddr);
1424 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1425 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1426 extern int xfrm6_output(struct sk_buff *skb);
1427 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1428                                  u8 **prevhdr);
1429
1430 #ifdef CONFIG_XFRM
1431 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1432 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1433 #else
1434 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1435 {
1436         return -ENOPROTOOPT;
1437 }
1438
1439 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1440 {
1441         /* should not happen */
1442         kfree_skb(skb);
1443         return 0;
1444 }
1445 #endif
1446
1447 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1448
1449 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1450 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1451         int (*func)(struct xfrm_policy *, int, int, void*), void *);
1452 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1453 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1454 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1455                                           u8 type, int dir,
1456                                           struct xfrm_selector *sel,
1457                                           struct xfrm_sec_ctx *ctx, int delete,
1458                                           int *err);
1459 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err);
1460 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1461 u32 xfrm_get_acqseq(void);
1462 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1463 struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark,
1464                                  u8 mode, u32 reqid, u8 proto,
1465                                  xfrm_address_t *daddr,
1466                                  xfrm_address_t *saddr, int create,
1467                                  unsigned short family);
1468 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1469 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1470                           struct flowi *fl, int family, int strict);
1471
1472 #ifdef CONFIG_XFRM_MIGRATE
1473 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1474                       struct xfrm_migrate *m, int num_bundles,
1475                       struct xfrm_kmaddress *k);
1476 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1477 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1478                                               struct xfrm_migrate *m);
1479 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1480                         struct xfrm_migrate *m, int num_bundles,
1481                         struct xfrm_kmaddress *k);
1482 #endif
1483
1484 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1485 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1486 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1487
1488 extern void xfrm_input_init(void);
1489 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1490
1491 extern void xfrm_probe_algs(void);
1492 extern int xfrm_count_auth_supported(void);
1493 extern int xfrm_count_enc_supported(void);
1494 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1495 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1496 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1497 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1498 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1499 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1500 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1501 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1502 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1503                                                    int probe);
1504
1505 struct hash_desc;
1506 struct scatterlist;
1507 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1508                               unsigned int);
1509
1510 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1511                                 int family)
1512 {
1513         switch (family) {
1514         default:
1515         case AF_INET:
1516                 return (__force u32)a->a4 - (__force u32)b->a4;
1517         case AF_INET6:
1518                 return ipv6_addr_cmp((struct in6_addr *)a,
1519                                      (struct in6_addr *)b);
1520         }
1521 }
1522
1523 static inline int xfrm_policy_id2dir(u32 index)
1524 {
1525         return index & 7;
1526 }
1527
1528 #ifdef CONFIG_XFRM
1529 static inline int xfrm_aevent_is_on(struct net *net)
1530 {
1531         struct sock *nlsk;
1532         int ret = 0;
1533
1534         rcu_read_lock();
1535         nlsk = rcu_dereference(net->xfrm.nlsk);
1536         if (nlsk)
1537                 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1538         rcu_read_unlock();
1539         return ret;
1540 }
1541 #endif
1542
1543 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1544 {
1545         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1546 }
1547
1548 static inline int xfrm_alg_auth_len(struct xfrm_algo_auth *alg)
1549 {
1550         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1551 }
1552
1553 #ifdef CONFIG_XFRM_MIGRATE
1554 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1555 {
1556         return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1557 }
1558
1559 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1560 {
1561         return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1562 }
1563
1564 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1565 {
1566         int i;
1567         for (i = 0; i < n; i++)
1568                 xfrm_state_put(*(states + i));
1569 }
1570
1571 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1572 {
1573         int i;
1574         for (i = 0; i < n; i++)
1575                 xfrm_state_delete(*(states + i));
1576 }
1577 #endif
1578
1579 #ifdef CONFIG_XFRM
1580 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1581 {
1582         return skb->sp->xvec[skb->sp->len - 1];
1583 }
1584 #endif
1585
1586 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1587 {
1588         if (attrs[XFRMA_MARK])
1589                 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(m));
1590         else
1591                 m->v = m->m = 0;
1592
1593         return m->v & m->m;
1594 }
1595
1596 static inline int xfrm_mark_put(struct sk_buff *skb, struct xfrm_mark *m)
1597 {
1598         if (m->m | m->v)
1599                 NLA_PUT(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1600         return 0;
1601
1602 nla_put_failure:
1603         return -1;
1604 }
1605
1606 #endif  /* _NET_XFRM_H */