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 #include <net/flow.h>
  24
  25 #include <linux/interrupt.h>
  26
  27 #ifdef CONFIG_XFRM_STATISTICS
  28 #include <net/snmp.h>
  29 #endif
  30
  31 #define XFRM_PROTO_ESP          50
  32 #define XFRM_PROTO_AH           51
  33 #define XFRM_PROTO_COMP         108
  34 #define XFRM_PROTO_IPIP         4
  35 #define XFRM_PROTO_IPV6         41
  36 #define XFRM_PROTO_ROUTING      IPPROTO_ROUTING
  37 #define XFRM_PROTO_DSTOPTS      IPPROTO_DSTOPTS
  38
  39 #define XFRM_ALIGN4(len)        (((len) + 3) & ~3)
  40 #define XFRM_ALIGN8(len)        (((len) + 7) & ~7)
  41 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
  42         MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
  43 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
  44         MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
  45
  46 #ifdef CONFIG_XFRM_STATISTICS
  47 #define XFRM_INC_STATS(net, field)      SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
  48 #define XFRM_INC_STATS_BH(net, field)   SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
  49 #define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
  50 #else
  51 #define XFRM_INC_STATS(net, field)      ((void)(net))
  52 #define XFRM_INC_STATS_BH(net, field)   ((void)(net))
  53 #define XFRM_INC_STATS_USER(net, field) ((void)(net))
  54 #endif
  55
  56 extern struct mutex xfrm_cfg_mutex;
  57
  58 /* Organization of SPD aka "XFRM rules"
  59    ------------------------------------
  60
  61    Basic objects:
  62    - policy rule, struct xfrm_policy (=SPD entry)
  63    - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
  64    - instance of a transformer, struct xfrm_state (=SA)
  65    - template to clone xfrm_state, struct xfrm_tmpl
  66
  67    SPD is plain linear list of xfrm_policy rules, ordered by priority.
  68    (To be compatible with existing pfkeyv2 implementations,
  69    many rules with priority of 0x7fffffff are allowed to exist and
  70    such rules are ordered in an unpredictable way, thanks to bsd folks.)
  71
  72    Lookup is plain linear search until the first match with selector.
  73
  74    If "action" is "block", then we prohibit the flow, otherwise:
  75    if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
  76    policy entry has list of up to XFRM_MAX_DEPTH transformations,
  77    described by templates xfrm_tmpl. Each template is resolved
  78    to a complete xfrm_state (see below) and we pack bundle of transformations
  79    to a dst_entry returned to requestor.
  80
  81    dst -. xfrm  .-> xfrm_state #1
  82     |---. child .-> dst -. xfrm .-> xfrm_state #2
  83                      |---. child .-> dst -. xfrm .-> xfrm_state #3
  84                                       |---. child .-> NULL
  85
  86    Bundles are cached at xrfm_policy struct (field ->bundles).
  87
  88
  89    Resolution of xrfm_tmpl
  90    -----------------------
  91    Template contains:
  92    1. ->mode            Mode: transport or tunnel
  93    2. ->id.proto        Protocol: AH/ESP/IPCOMP
  94    3. ->id.daddr        Remote tunnel endpoint, ignored for transport mode.
  95       Q: allow to resolve security gateway?
  96    4. ->id.spi          If not zero, static SPI.
  97    5. ->saddr           Local tunnel endpoint, ignored for transport mode.
  98    6. ->algos           List of allowed algos. Plain bitmask now.
  99       Q: ealgos, aalgos, calgos. What a mess...
 100    7. ->share           Sharing mode.
 101       Q: how to implement private sharing mode? To add struct sock* to
 102       flow id?
 103
 104    Having this template we search through SAD searching for entries
 105    with appropriate mode/proto/algo, permitted by selector.
 106    If no appropriate entry found, it is requested from key manager.
 107
 108    PROBLEMS:
 109    Q: How to find all the bundles referring to a physical path for
 110       PMTU discovery? Seems, dst should contain list of all parents...
 111       and enter to infinite locking hierarchy disaster.
 112       No! It is easier, we will not search for them, let them find us.
 113       We add genid to each dst plus pointer to genid of raw IP route,
 114       pmtu disc will update pmtu on raw IP route and increase its genid.
 115       dst_check() will see this for top level and trigger resyncing
 116       metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
 117  */
 118
 119 struct xfrm_state_walk {
 120         struct list_head        all;
 121         u8                      state;
 122         union {
 123                 u8              dying;
 124                 u8              proto;
 125         };
 126         u32                     seq;
 127 };
 128
 129 /* Full description of state of transformer. */
 130 struct xfrm_state {
 131 #ifdef CONFIG_NET_NS
 132         struct net              *xs_net;
 133 #endif
 134         union {
 135                 struct hlist_node       gclist;
 136                 struct hlist_node       bydst;
 137         };
 138         struct hlist_node       bysrc;
 139         struct hlist_node       byspi;
 140
 141         atomic_t                refcnt;
 142         spinlock_t              lock;
 143
 144         struct xfrm_id          id;
 145         struct xfrm_selector    sel;
 146         struct xfrm_mark        mark;
 147         u32                     tfcpad;
 148
 149         u32                     genid;
 150
 151         /* Key manager bits */
 152         struct xfrm_state_walk  km;
 153
 154         /* Parameters of this state. */
 155         struct {
 156                 u32             reqid;
 157                 u8              mode;
 158                 u8              replay_window;
 159                 u8              aalgo, ealgo, calgo;
 160                 u8              flags;
 161                 u16             family;
 162                 xfrm_address_t  saddr;
 163                 int             header_len;
 164                 int             trailer_len;
 165         } props;
 166
 167         struct xfrm_lifetime_cfg lft;
 168
 169         /* Data for transformer */
 170         struct xfrm_algo_auth   *aalg;
 171         struct xfrm_algo        *ealg;
 172         struct xfrm_algo        *calg;
 173         struct xfrm_algo_aead   *aead;
 174
 175         /* Data for encapsulator */
 176         struct xfrm_encap_tmpl  *encap;
 177
 178         /* Data for care-of address */
 179         xfrm_address_t  *coaddr;
 180
 181         /* IPComp needs an IPIP tunnel for handling uncompressed packets */
 182         struct xfrm_state       *tunnel;
 183
 184         /* If a tunnel, number of users + 1 */
 185         atomic_t                tunnel_users;
 186
 187         /* State for replay detection */
 188         struct xfrm_replay_state replay;
 189         struct xfrm_replay_state_esn *replay_esn;
 190
 191         /* Replay detection state at the time we sent the last notification */
 192         struct xfrm_replay_state preplay;
 193         struct xfrm_replay_state_esn *preplay_esn;
 194
 195         /* The functions for replay detection. */
 196         struct xfrm_replay      *repl;
 197
 198         /* internal flag that only holds state for delayed aevent at the
 199          * moment
 200         */
 201         u32                     xflags;
 202
 203         /* Replay detection notification settings */
 204         u32                     replay_maxage;
 205         u32                     replay_maxdiff;
 206
 207         /* Replay detection notification timer */
 208         struct timer_list       rtimer;
 209
 210         /* Statistics */
 211         struct xfrm_stats       stats;
 212
 213         struct xfrm_lifetime_cur curlft;
 214         struct tasklet_hrtimer  mtimer;
 215
 216         /* Last used time */
 217         unsigned long           lastused;
 218
 219         /* Reference to data common to all the instances of this
 220          * transformer. */
 221         const struct xfrm_type  *type;
 222         struct xfrm_mode        *inner_mode;
 223         struct xfrm_mode        *inner_mode_iaf;
 224         struct xfrm_mode        *outer_mode;
 225
 226         /* Security context */
 227         struct xfrm_sec_ctx     *security;
 228
 229         /* Private data of this transformer, format is opaque,
 230          * interpreted by xfrm_type methods. */
 231         void                    *data;
 232 };
 233
 234 static inline struct net *xs_net(struct xfrm_state *x)
 235 {
 236         return read_pnet(&x->xs_net);
 237 }
 238
 239 /* xflags - make enum if more show up */
 240 #define XFRM_TIME_DEFER 1
 241
 242 enum {
 243         XFRM_STATE_VOID,
 244         XFRM_STATE_ACQ,
 245         XFRM_STATE_VALID,
 246         XFRM_STATE_ERROR,
 247         XFRM_STATE_EXPIRED,
 248         XFRM_STATE_DEAD
 249 };
 250
 251 /* callback structure passed from either netlink or pfkey */
 252 struct km_event {
 253         union {
 254                 u32 hard;
 255                 u32 proto;
 256                 u32 byid;
 257                 u32 aevent;
 258                 u32 type;
 259         } data;
 260
 261         u32     seq;
 262         u32     pid;
 263         u32     event;
 264         struct net *net;
 265 };
 266
 267 struct xfrm_replay {
 268         void    (*advance)(struct xfrm_state *x, __be32 net_seq);
 269         int     (*check)(struct xfrm_state *x,
 270                          struct sk_buff *skb,
 271                          __be32 net_seq);
 272         void    (*notify)(struct xfrm_state *x, int event);
 273         int     (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
 274 };
 275
 276 struct net_device;
 277 struct xfrm_type;
 278 struct xfrm_dst;
 279 struct xfrm_policy_afinfo {
 280         unsigned short          family;
 281         struct dst_ops          *dst_ops;
 282         void                    (*garbage_collect)(struct net *net);
 283         struct dst_entry        *(*dst_lookup)(struct net *net, int tos,
 284                                                const xfrm_address_t *saddr,
 285                                                const xfrm_address_t *daddr);
 286         int                     (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
 287         void                    (*decode_session)(struct sk_buff *skb,
 288                                                   struct flowi *fl,
 289                                                   int reverse);
 290         int                     (*get_tos)(const struct flowi *fl);
 291         int                     (*init_path)(struct xfrm_dst *path,
 292                                              struct dst_entry *dst,
 293                                              int nfheader_len);
 294         int                     (*fill_dst)(struct xfrm_dst *xdst,
 295                                             struct net_device *dev,
 296                                             const struct flowi *fl);
 297         struct dst_entry        *(*blackhole_route)(struct net *net, struct dst_entry *orig);
 298 };
 299
 300 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
 301 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
 302 extern void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c);
 303 extern void km_state_notify(struct xfrm_state *x, const struct km_event *c);
 304
 305 struct xfrm_tmpl;
 306 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
 307 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
 308 extern int __xfrm_state_delete(struct xfrm_state *x);
 309
 310 struct xfrm_state_afinfo {
 311         unsigned int            family;
 312         unsigned int            proto;
 313         __be16                  eth_proto;
 314         struct module           *owner;
 315         const struct xfrm_type  *type_map[IPPROTO_MAX];
 316         struct xfrm_mode        *mode_map[XFRM_MODE_MAX];
 317         int                     (*init_flags)(struct xfrm_state *x);
 318         void                    (*init_tempsel)(struct xfrm_selector *sel,
 319                                                 const struct flowi *fl);
 320         void                    (*init_temprop)(struct xfrm_state *x,
 321                                                 const struct xfrm_tmpl *tmpl,
 322                                                 const xfrm_address_t *daddr,
 323                                                 const xfrm_address_t *saddr);
 324         int                     (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
 325         int                     (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
 326         int                     (*output)(struct sk_buff *skb);
 327         int                     (*extract_input)(struct xfrm_state *x,
 328                                                  struct sk_buff *skb);
 329         int                     (*extract_output)(struct xfrm_state *x,
 330                                                   struct sk_buff *skb);
 331         int                     (*transport_finish)(struct sk_buff *skb,
 332                                                     int async);
 333 };
 334
 335 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
 336 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
 337
 338 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
 339
 340 struct xfrm_type {
 341         char                    *description;
 342         struct module           *owner;
 343         u8                      proto;
 344         u8                      flags;
 345 #define XFRM_TYPE_NON_FRAGMENT  1
 346 #define XFRM_TYPE_REPLAY_PROT   2
 347 #define XFRM_TYPE_LOCAL_COADDR  4
 348 #define XFRM_TYPE_REMOTE_COADDR 8
 349
 350         int                     (*init_state)(struct xfrm_state *x);
 351         void                    (*destructor)(struct xfrm_state *);
 352         int                     (*input)(struct xfrm_state *, struct sk_buff *skb);
 353         int                     (*output)(struct xfrm_state *, struct sk_buff *pskb);
 354         int                     (*reject)(struct xfrm_state *, struct sk_buff *,
 355                                           const struct flowi *);
 356         int                     (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
 357         /* Estimate maximal size of result of transformation of a dgram */
 358         u32                     (*get_mtu)(struct xfrm_state *, int size);
 359 };
 360
 361 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
 362 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
 363
 364 struct xfrm_mode {
 365         /*
 366          * Remove encapsulation header.
 367          *
 368          * The IP header will be moved over the top of the encapsulation
 369          * header.
 370          *
 371          * On entry, the transport header shall point to where the IP header
 372          * should be and the network header shall be set to where the IP
 373          * header currently is.  skb->data shall point to the start of the
 374          * payload.
 375          */
 376         int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
 377
 378         /*
 379          * This is the actual input entry point.
 380          *
 381          * For transport mode and equivalent this would be identical to
 382          * input2 (which does not need to be set).  While tunnel mode
 383          * and equivalent would set this to the tunnel encapsulation function
 384          * xfrm4_prepare_input that would in turn call input2.
 385          */
 386         int (*input)(struct xfrm_state *x, struct sk_buff *skb);
 387
 388         /*
 389          * Add encapsulation header.
 390          *
 391          * On exit, the transport header will be set to the start of the
 392          * encapsulation header to be filled in by x->type->output and
 393          * the mac header will be set to the nextheader (protocol for
 394          * IPv4) field of the extension header directly preceding the
 395          * encapsulation header, or in its absence, that of the top IP
 396          * header.  The value of the network header will always point
 397          * to the top IP header while skb->data will point to the payload.
 398          */
 399         int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
 400
 401         /*
 402          * This is the actual output entry point.
 403          *
 404          * For transport mode and equivalent this would be identical to
 405          * output2 (which does not need to be set).  While tunnel mode
 406          * and equivalent would set this to a tunnel encapsulation function
 407          * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
 408          * call output2.
 409          */
 410         int (*output)(struct xfrm_state *x, struct sk_buff *skb);
 411
 412         struct xfrm_state_afinfo *afinfo;
 413         struct module *owner;
 414         unsigned int encap;
 415         int flags;
 416 };
 417
 418 /* Flags for xfrm_mode. */
 419 enum {
 420         XFRM_MODE_FLAG_TUNNEL = 1,
 421 };
 422
 423 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
 424 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
 425
 426 static inline int xfrm_af2proto(unsigned int family)
 427 {
 428         switch(family) {
 429         case AF_INET:
 430                 return IPPROTO_IPIP;
 431         case AF_INET6:
 432                 return IPPROTO_IPV6;
 433         default:
 434                 return 0;
 435         }
 436 }
 437
 438 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
 439 {
 440         if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
 441             (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
 442                 return x->inner_mode;
 443         else
 444                 return x->inner_mode_iaf;
 445 }
 446
 447 struct xfrm_tmpl {
 448 /* id in template is interpreted as:
 449  * daddr - destination of tunnel, may be zero for transport mode.
 450  * spi   - zero to acquire spi. Not zero if spi is static, then
 451  *         daddr must be fixed too.
 452  * proto - AH/ESP/IPCOMP
 453  */
 454         struct xfrm_id          id;
 455
 456 /* Source address of tunnel. Ignored, if it is not a tunnel. */
 457         xfrm_address_t          saddr;
 458
 459         unsigned short          encap_family;
 460
 461         u32                     reqid;
 462
 463 /* Mode: transport, tunnel etc. */
 464         u8                      mode;
 465
 466 /* Sharing mode: unique, this session only, this user only etc. */
 467         u8                      share;
 468
 469 /* May skip this transfomration if no SA is found */
 470         u8                      optional;
 471
 472 /* Skip aalgos/ealgos/calgos checks. */
 473         u8                      allalgs;
 474
 475 /* Bit mask of algos allowed for acquisition */
 476         u32                     aalgos;
 477         u32                     ealgos;
 478         u32                     calgos;
 479 };
 480
 481 #define XFRM_MAX_DEPTH          6
 482
 483 struct xfrm_policy_walk_entry {
 484         struct list_head        all;
 485         u8                      dead;
 486 };
 487
 488 struct xfrm_policy_walk {
 489         struct xfrm_policy_walk_entry walk;
 490         u8 type;
 491         u32 seq;
 492 };
 493
 494 struct xfrm_policy {
 495 #ifdef CONFIG_NET_NS
 496         struct net              *xp_net;
 497 #endif
 498         struct hlist_node       bydst;
 499         struct hlist_node       byidx;
 500
 501         /* This lock only affects elements except for entry. */
 502         rwlock_t                lock;
 503         atomic_t                refcnt;
 504         struct timer_list       timer;
 505
 506         struct flow_cache_object flo;
 507         atomic_t                genid;
 508         u32                     priority;
 509         u32                     index;
 510         struct xfrm_mark        mark;
 511         struct xfrm_selector    selector;
 512         struct xfrm_lifetime_cfg lft;
 513         struct xfrm_lifetime_cur curlft;
 514         struct xfrm_policy_walk_entry walk;
 515         u8                      type;
 516         u8                      action;
 517         u8                      flags;
 518         u8                      xfrm_nr;
 519         u16                     family;
 520         struct xfrm_sec_ctx     *security;
 521         struct xfrm_tmpl        xfrm_vec[XFRM_MAX_DEPTH];
 522 };
 523
 524 static inline struct net *xp_net(const struct xfrm_policy *xp)
 525 {
 526         return read_pnet(&xp->xp_net);
 527 }
 528
 529 struct xfrm_kmaddress {
 530         xfrm_address_t          local;
 531         xfrm_address_t          remote;
 532         u32                     reserved;
 533         u16                     family;
 534 };
 535
 536 struct xfrm_migrate {
 537         xfrm_address_t          old_daddr;
 538         xfrm_address_t          old_saddr;
 539         xfrm_address_t          new_daddr;
 540         xfrm_address_t          new_saddr;
 541         u8                      proto;
 542         u8                      mode;
 543         u16                     reserved;
 544         u32                     reqid;
 545         u16                     old_family;
 546         u16                     new_family;
 547 };
 548
 549 #define XFRM_KM_TIMEOUT                30
 550 /* which seqno */
 551 #define XFRM_REPLAY_SEQ         1
 552 #define XFRM_REPLAY_OSEQ        2
 553 #define XFRM_REPLAY_SEQ_MASK    3
 554 /* what happened */
 555 #define XFRM_REPLAY_UPDATE      XFRM_AE_CR
 556 #define XFRM_REPLAY_TIMEOUT     XFRM_AE_CE
 557
 558 /* default aevent timeout in units of 100ms */
 559 #define XFRM_AE_ETIME                   10
 560 /* Async Event timer multiplier */
 561 #define XFRM_AE_ETH_M                   10
 562 /* default seq threshold size */
 563 #define XFRM_AE_SEQT_SIZE               2
 564
 565 struct xfrm_mgr {
 566         struct list_head        list;
 567         char                    *id;
 568         int                     (*notify)(struct xfrm_state *x, const struct km_event *c);
 569         int                     (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
 570         struct xfrm_policy      *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
 571         int                     (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
 572         int                     (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
 573         int                     (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
 574         int                     (*migrate)(const struct xfrm_selector *sel,
 575                                            u8 dir, u8 type,
 576                                            const struct xfrm_migrate *m,
 577                                            int num_bundles,
 578                                            const struct xfrm_kmaddress *k);
 579 };
 580
 581 extern int xfrm_register_km(struct xfrm_mgr *km);
 582 extern int xfrm_unregister_km(struct xfrm_mgr *km);
 583
 584 /*
 585  * This structure is used for the duration where packets are being
 586  * transformed by IPsec.  As soon as the packet leaves IPsec the
 587  * area beyond the generic IP part may be overwritten.
 588  */
 589 struct xfrm_skb_cb {
 590         union {
 591                 struct inet_skb_parm h4;
 592                 struct inet6_skb_parm h6;
 593         } header;
 594
 595         /* Sequence number for replay protection. */
 596         union {
 597                 struct {
 598                         __u32 low;
 599                         __u32 hi;
 600                 } output;
 601                 struct {
 602                         __be32 low;
 603                         __be32 hi;
 604                 } input;
 605         } seq;
 606 };
 607
 608 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
 609
 610 /*
 611  * This structure is used by the afinfo prepare_input/prepare_output functions
 612  * to transmit header information to the mode input/output functions.
 613  */
 614 struct xfrm_mode_skb_cb {
 615         union {
 616                 struct inet_skb_parm h4;
 617                 struct inet6_skb_parm h6;
 618         } header;
 619
 620         /* Copied from header for IPv4, always set to zero and DF for IPv6. */
 621         __be16 id;
 622         __be16 frag_off;
 623
 624         /* IP header length (excluding options or extension headers). */
 625         u8 ihl;
 626
 627         /* TOS for IPv4, class for IPv6. */
 628         u8 tos;
 629
 630         /* TTL for IPv4, hop limitfor IPv6. */
 631         u8 ttl;
 632
 633         /* Protocol for IPv4, NH for IPv6. */
 634         u8 protocol;
 635
 636         /* Option length for IPv4, zero for IPv6. */
 637         u8 optlen;
 638
 639         /* Used by IPv6 only, zero for IPv4. */
 640         u8 flow_lbl[3];
 641 };
 642
 643 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
 644
 645 /*
 646  * This structure is used by the input processing to locate the SPI and
 647  * related information.
 648  */
 649 struct xfrm_spi_skb_cb {
 650         union {
 651                 struct inet_skb_parm h4;
 652                 struct inet6_skb_parm h6;
 653         } header;
 654
 655         unsigned int daddroff;
 656         unsigned int family;
 657 };
 658
 659 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
 660
 661 /* Audit Information */
 662 struct xfrm_audit {
 663         u32     secid;
 664         uid_t   loginuid;
 665         u32     sessionid;
 666 };
 667
 668 #ifdef CONFIG_AUDITSYSCALL
 669 static inline struct audit_buffer *xfrm_audit_start(const char *op)
 670 {
 671         struct audit_buffer *audit_buf = NULL;
 672
 673         if (audit_enabled == 0)
 674                 return NULL;
 675         audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
 676                                     AUDIT_MAC_IPSEC_EVENT);
 677         if (audit_buf == NULL)
 678                 return NULL;
 679         audit_log_format(audit_buf, "op=%s", op);
 680         return audit_buf;
 681 }
 682
 683 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
 684                                              struct audit_buffer *audit_buf)
 685 {
 686         char *secctx;
 687         u32 secctx_len;
 688
 689         audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
 690         if (secid != 0 &&
 691             security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
 692                 audit_log_format(audit_buf, " subj=%s", secctx);
 693                 security_release_secctx(secctx, secctx_len);
 694         } else
 695                 audit_log_task_context(audit_buf);
 696 }
 697
 698 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 699                                   u32 auid, u32 ses, u32 secid);
 700 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 701                                   u32 auid, u32 ses, u32 secid);
 702 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
 703                                  u32 auid, u32 ses, u32 secid);
 704 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 705                                     u32 auid, u32 ses, u32 secid);
 706 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 707                                              struct sk_buff *skb);
 708 extern void xfrm_audit_state_replay(struct xfrm_state *x,
 709                                     struct sk_buff *skb, __be32 net_seq);
 710 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
 711 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 712                                       __be32 net_spi, __be32 net_seq);
 713 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
 714                                      struct sk_buff *skb, u8 proto);
 715 #else
 716
 717 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 718                                   u32 auid, u32 ses, u32 secid)
 719 {
 720 }
 721
 722 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 723                                   u32 auid, u32 ses, u32 secid)
 724 {
 725 }
 726
 727 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
 728                                  u32 auid, u32 ses, u32 secid)
 729 {
 730 }
 731
 732 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 733                                     u32 auid, u32 ses, u32 secid)
 734 {
 735 }
 736
 737 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 738                                              struct sk_buff *skb)
 739 {
 740 }
 741
 742 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
 743                                            struct sk_buff *skb, __be32 net_seq)
 744 {
 745 }
 746
 747 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
 748                                       u16 family)
 749 {
 750 }
 751
 752 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 753                                       __be32 net_spi, __be32 net_seq)
 754 {
 755 }
 756
 757 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
 758                                      struct sk_buff *skb, u8 proto)
 759 {
 760 }
 761 #endif /* CONFIG_AUDITSYSCALL */
 762
 763 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
 764 {
 765         if (likely(policy != NULL))
 766                 atomic_inc(&policy->refcnt);
 767 }
 768
 769 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
 770
 771 static inline void xfrm_pol_put(struct xfrm_policy *policy)
 772 {
 773         if (atomic_dec_and_test(&policy->refcnt))
 774                 xfrm_policy_destroy(policy);
 775 }
 776
 777 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 778 {
 779         int i;
 780         for (i = npols - 1; i >= 0; --i)
 781                 xfrm_pol_put(pols[i]);
 782 }
 783
 784 extern void __xfrm_state_destroy(struct xfrm_state *);
 785
 786 static inline void __xfrm_state_put(struct xfrm_state *x)
 787 {
 788         atomic_dec(&x->refcnt);
 789 }
 790
 791 static inline void xfrm_state_put(struct xfrm_state *x)
 792 {
 793         if (atomic_dec_and_test(&x->refcnt))
 794                 __xfrm_state_destroy(x);
 795 }
 796
 797 static inline void xfrm_state_hold(struct xfrm_state *x)
 798 {
 799         atomic_inc(&x->refcnt);
 800 }
 801
 802 static inline bool addr_match(const void *token1, const void *token2,
 803                               int prefixlen)
 804 {
 805         const __be32 *a1 = token1;
 806         const __be32 *a2 = token2;
 807         int pdw;
 808         int pbi;
 809
 810         pdw = prefixlen >> 5;     /* num of whole u32 in prefix */
 811         pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
 812
 813         if (pdw)
 814                 if (memcmp(a1, a2, pdw << 2))
 815                         return false;
 816
 817         if (pbi) {
 818                 __be32 mask;
 819
 820                 mask = htonl((0xffffffff) << (32 - pbi));
 821
 822                 if ((a1[pdw] ^ a2[pdw]) & mask)
 823                         return false;
 824         }
 825
 826         return true;
 827 }
 828
 829 static __inline__
 830 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
 831 {
 832         __be16 port;
 833         switch(fl->flowi_proto) {
 834         case IPPROTO_TCP:
 835         case IPPROTO_UDP:
 836         case IPPROTO_UDPLITE:
 837         case IPPROTO_SCTP:
 838                 port = uli->ports.sport;
 839                 break;
 840         case IPPROTO_ICMP:
 841         case IPPROTO_ICMPV6:
 842                 port = htons(uli->icmpt.type);
 843                 break;
 844         case IPPROTO_MH:
 845                 port = htons(uli->mht.type);
 846                 break;
 847         case IPPROTO_GRE:
 848                 port = htons(ntohl(uli->gre_key) >> 16);
 849                 break;
 850         default:
 851                 port = 0;       /*XXX*/
 852         }
 853         return port;
 854 }
 855
 856 static __inline__
 857 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
 858 {
 859         __be16 port;
 860         switch(fl->flowi_proto) {
 861         case IPPROTO_TCP:
 862         case IPPROTO_UDP:
 863         case IPPROTO_UDPLITE:
 864         case IPPROTO_SCTP:
 865                 port = uli->ports.dport;
 866                 break;
 867         case IPPROTO_ICMP:
 868         case IPPROTO_ICMPV6:
 869                 port = htons(uli->icmpt.code);
 870                 break;
 871         case IPPROTO_GRE:
 872                 port = htons(ntohl(uli->gre_key) & 0xffff);
 873                 break;
 874         default:
 875                 port = 0;       /*XXX*/
 876         }
 877         return port;
 878 }
 879
 880 extern int xfrm_selector_match(const struct xfrm_selector *sel,
 881                                const struct flowi *fl,
 882                                unsigned short family);
 883
 884 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 885 /*      If neither has a context --> match
 886  *      Otherwise, both must have a context and the sids, doi, alg must match
 887  */
 888 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 889 {
 890         return ((!s1 && !s2) ||
 891                 (s1 && s2 &&
 892                  (s1->ctx_sid == s2->ctx_sid) &&
 893                  (s1->ctx_doi == s2->ctx_doi) &&
 894                  (s1->ctx_alg == s2->ctx_alg)));
 895 }
 896 #else
 897 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 898 {
 899         return 1;
 900 }
 901 #endif
 902
 903 /* A struct encoding bundle of transformations to apply to some set of flow.
 904  *
 905  * dst->child points to the next element of bundle.
 906  * dst->xfrm  points to an instanse of transformer.
 907  *
 908  * Due to unfortunate limitations of current routing cache, which we
 909  * have no time to fix, it mirrors struct rtable and bound to the same
 910  * routing key, including saddr,daddr. However, we can have many of
 911  * bundles differing by session id. All the bundles grow from a parent
 912  * policy rule.
 913  */
 914 struct xfrm_dst {
 915         union {
 916                 struct dst_entry        dst;
 917                 struct rtable           rt;
 918                 struct rt6_info         rt6;
 919         } u;
 920         struct dst_entry *route;
 921         struct flow_cache_object flo;
 922         struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
 923         int num_pols, num_xfrms;
 924 #ifdef CONFIG_XFRM_SUB_POLICY
 925         struct flowi *origin;
 926         struct xfrm_selector *partner;
 927 #endif
 928         u32 xfrm_genid;
 929         u32 policy_genid;
 930         u32 route_mtu_cached;
 931         u32 child_mtu_cached;
 932         u32 route_cookie;
 933         u32 path_cookie;
 934 };
 935
 936 #ifdef CONFIG_XFRM
 937 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
 938 {
 939         xfrm_pols_put(xdst->pols, xdst->num_pols);
 940         dst_release(xdst->route);
 941         if (likely(xdst->u.dst.xfrm))
 942                 xfrm_state_put(xdst->u.dst.xfrm);
 943 #ifdef CONFIG_XFRM_SUB_POLICY
 944         kfree(xdst->origin);
 945         xdst->origin = NULL;
 946         kfree(xdst->partner);
 947         xdst->partner = NULL;
 948 #endif
 949 }
 950 #endif
 951
 952 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
 953
 954 struct sec_path {
 955         atomic_t                refcnt;
 956         int                     len;
 957         struct xfrm_state       *xvec[XFRM_MAX_DEPTH];
 958 };
 959
 960 static inline struct sec_path *
 961 secpath_get(struct sec_path *sp)
 962 {
 963         if (sp)
 964                 atomic_inc(&sp->refcnt);
 965         return sp;
 966 }
 967
 968 extern void __secpath_destroy(struct sec_path *sp);
 969
 970 static inline void
 971 secpath_put(struct sec_path *sp)
 972 {
 973         if (sp && atomic_dec_and_test(&sp->refcnt))
 974                 __secpath_destroy(sp);
 975 }
 976
 977 extern struct sec_path *secpath_dup(struct sec_path *src);
 978
 979 static inline void
 980 secpath_reset(struct sk_buff *skb)
 981 {
 982 #ifdef CONFIG_XFRM
 983         secpath_put(skb->sp);
 984         skb->sp = NULL;
 985 #endif
 986 }
 987
 988 static inline int
 989 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
 990 {
 991         switch (family) {
 992         case AF_INET:
 993                 return addr->a4 == 0;
 994         case AF_INET6:
 995                 return ipv6_addr_any((struct in6_addr *)&addr->a6);
 996         }
 997         return 0;
 998 }
 999
1000 static inline int
1001 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1002 {
1003         return  (tmpl->saddr.a4 &&
1004                  tmpl->saddr.a4 != x->props.saddr.a4);
1005 }
1006
1007 static inline int
1008 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1009 {
1010         return  (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1011                  ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1012 }
1013
1014 static inline int
1015 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1016 {
1017         switch (family) {
1018         case AF_INET:
1019                 return __xfrm4_state_addr_cmp(tmpl, x);
1020         case AF_INET6:
1021                 return __xfrm6_state_addr_cmp(tmpl, x);
1022         }
1023         return !0;
1024 }
1025
1026 #ifdef CONFIG_XFRM
1027 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
1028
1029 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1030                                        struct sk_buff *skb,
1031                                        unsigned int family, int reverse)
1032 {
1033         struct net *net = dev_net(skb->dev);
1034         int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1035
1036         if (sk && sk->sk_policy[XFRM_POLICY_IN])
1037                 return __xfrm_policy_check(sk, ndir, skb, family);
1038
1039         return  (!net->xfrm.policy_count[dir] && !skb->sp) ||
1040                 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1041                 __xfrm_policy_check(sk, ndir, skb, family);
1042 }
1043
1044 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1045 {
1046         return __xfrm_policy_check2(sk, dir, skb, family, 0);
1047 }
1048
1049 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1050 {
1051         return xfrm_policy_check(sk, dir, skb, AF_INET);
1052 }
1053
1054 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1055 {
1056         return xfrm_policy_check(sk, dir, skb, AF_INET6);
1057 }
1058
1059 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1060                                              struct sk_buff *skb)
1061 {
1062         return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1063 }
1064
1065 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1066                                              struct sk_buff *skb)
1067 {
1068         return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1069 }
1070
1071 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1072                                  unsigned int family, int reverse);
1073
1074 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1075                                       unsigned int family)
1076 {
1077         return __xfrm_decode_session(skb, fl, family, 0);
1078 }
1079
1080 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1081                                               struct flowi *fl,
1082                                               unsigned int family)
1083 {
1084         return __xfrm_decode_session(skb, fl, family, 1);
1085 }
1086
1087 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1088
1089 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1090 {
1091         struct net *net = dev_net(skb->dev);
1092
1093         return  !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1094                 (skb_dst(skb)->flags & DST_NOXFRM) ||
1095                 __xfrm_route_forward(skb, family);
1096 }
1097
1098 static inline int xfrm4_route_forward(struct sk_buff *skb)
1099 {
1100         return xfrm_route_forward(skb, AF_INET);
1101 }
1102
1103 static inline int xfrm6_route_forward(struct sk_buff *skb)
1104 {
1105         return xfrm_route_forward(skb, AF_INET6);
1106 }
1107
1108 extern int __xfrm_sk_clone_policy(struct sock *sk);
1109
1110 static inline int xfrm_sk_clone_policy(struct sock *sk)
1111 {
1112         if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1113                 return __xfrm_sk_clone_policy(sk);
1114         return 0;
1115 }
1116
1117 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1118
1119 static inline void xfrm_sk_free_policy(struct sock *sk)
1120 {
1121         if (unlikely(sk->sk_policy[0] != NULL)) {
1122                 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1123                 sk->sk_policy[0] = NULL;
1124         }
1125         if (unlikely(sk->sk_policy[1] != NULL)) {
1126                 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1127                 sk->sk_policy[1] = NULL;
1128         }
1129 }
1130
1131 #else
1132
1133 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1134 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1135 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1136 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1137 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1138 {
1139         return 1;
1140 }
1141 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1142 {
1143         return 1;
1144 }
1145 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1146 {
1147         return 1;
1148 }
1149 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1150                                               struct flowi *fl,
1151                                               unsigned int family)
1152 {
1153         return -ENOSYS;
1154 }
1155 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1156                                              struct sk_buff *skb)
1157 {
1158         return 1;
1159 }
1160 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1161                                              struct sk_buff *skb)
1162 {
1163         return 1;
1164 }
1165 #endif
1166
1167 static __inline__
1168 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1169 {
1170         switch (family){
1171         case AF_INET:
1172                 return (xfrm_address_t *)&fl->u.ip4.daddr;
1173         case AF_INET6:
1174                 return (xfrm_address_t *)&fl->u.ip6.daddr;
1175         }
1176         return NULL;
1177 }
1178
1179 static __inline__
1180 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1181 {
1182         switch (family){
1183         case AF_INET:
1184                 return (xfrm_address_t *)&fl->u.ip4.saddr;
1185         case AF_INET6:
1186                 return (xfrm_address_t *)&fl->u.ip6.saddr;
1187         }
1188         return NULL;
1189 }
1190
1191 static __inline__
1192 void xfrm_flowi_addr_get(const struct flowi *fl,
1193                          xfrm_address_t *saddr, xfrm_address_t *daddr,
1194                          unsigned short family)
1195 {
1196         switch(family) {
1197         case AF_INET:
1198                 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1199                 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1200                 break;
1201         case AF_INET6:
1202                 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->u.ip6.saddr);
1203                 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->u.ip6.daddr);
1204                 break;
1205         }
1206 }
1207
1208 static __inline__ int
1209 __xfrm4_state_addr_check(const struct xfrm_state *x,
1210                          const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1211 {
1212         if (daddr->a4 == x->id.daddr.a4 &&
1213             (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1214                 return 1;
1215         return 0;
1216 }
1217
1218 static __inline__ int
1219 __xfrm6_state_addr_check(const struct xfrm_state *x,
1220                          const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1221 {
1222         if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1223             (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1224              ipv6_addr_any((struct in6_addr *)saddr) ||
1225              ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1226                 return 1;
1227         return 0;
1228 }
1229
1230 static __inline__ int
1231 xfrm_state_addr_check(const struct xfrm_state *x,
1232                       const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1233                       unsigned short family)
1234 {
1235         switch (family) {
1236         case AF_INET:
1237                 return __xfrm4_state_addr_check(x, daddr, saddr);
1238         case AF_INET6:
1239                 return __xfrm6_state_addr_check(x, daddr, saddr);
1240         }
1241         return 0;
1242 }
1243
1244 static __inline__ int
1245 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1246                            unsigned short family)
1247 {
1248         switch (family) {
1249         case AF_INET:
1250                 return __xfrm4_state_addr_check(x,
1251                                                 (const xfrm_address_t *)&fl->u.ip4.daddr,
1252                                                 (const xfrm_address_t *)&fl->u.ip4.saddr);
1253         case AF_INET6:
1254                 return __xfrm6_state_addr_check(x,
1255                                                 (const xfrm_address_t *)&fl->u.ip6.daddr,
1256                                                 (const xfrm_address_t *)&fl->u.ip6.saddr);
1257         }
1258         return 0;
1259 }
1260
1261 static inline int xfrm_state_kern(const struct xfrm_state *x)
1262 {
1263         return atomic_read(&x->tunnel_users);
1264 }
1265
1266 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1267 {
1268         return (!userproto || proto == userproto ||
1269                 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1270                                                   proto == IPPROTO_ESP ||
1271                                                   proto == IPPROTO_COMP)));
1272 }
1273
1274 /*
1275  * xfrm algorithm information
1276  */
1277 struct xfrm_algo_aead_info {
1278         u16 icv_truncbits;
1279 };
1280
1281 struct xfrm_algo_auth_info {
1282         u16 icv_truncbits;
1283         u16 icv_fullbits;
1284 };
1285
1286 struct xfrm_algo_encr_info {
1287         u16 blockbits;
1288         u16 defkeybits;
1289 };
1290
1291 struct xfrm_algo_comp_info {
1292         u16 threshold;
1293 };
1294
1295 struct xfrm_algo_desc {
1296         char *name;
1297         char *compat;
1298         u8 available:1;
1299         union {
1300                 struct xfrm_algo_aead_info aead;
1301                 struct xfrm_algo_auth_info auth;
1302                 struct xfrm_algo_encr_info encr;
1303                 struct xfrm_algo_comp_info comp;
1304         } uinfo;
1305         struct sadb_alg desc;
1306 };
1307
1308 /* XFRM tunnel handlers.  */
1309 struct xfrm_tunnel {
1310         int (*handler)(struct sk_buff *skb);
1311         int (*err_handler)(struct sk_buff *skb, u32 info);
1312
1313         struct xfrm_tunnel __rcu *next;
1314         int priority;
1315 };
1316
1317 struct xfrm6_tunnel {
1318         int (*handler)(struct sk_buff *skb);
1319         int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1320                            u8 type, u8 code, int offset, __be32 info);
1321         struct xfrm6_tunnel __rcu *next;
1322         int priority;
1323 };
1324
1325 extern void xfrm_init(void);
1326 extern void xfrm4_init(int rt_hash_size);
1327 extern int xfrm_state_init(struct net *net);
1328 extern void xfrm_state_fini(struct net *net);
1329 extern void xfrm4_state_init(void);
1330 #ifdef CONFIG_XFRM
1331 extern int xfrm6_init(void);
1332 extern void xfrm6_fini(void);
1333 extern int xfrm6_state_init(void);
1334 extern void xfrm6_state_fini(void);
1335 #else
1336 static inline int xfrm6_init(void)
1337 {
1338         return 0;
1339 }
1340 static inline void xfrm6_fini(void)
1341 {
1342         ;
1343 }
1344 #endif
1345
1346 #ifdef CONFIG_XFRM_STATISTICS
1347 extern int xfrm_proc_init(struct net *net);
1348 extern void xfrm_proc_fini(struct net *net);
1349 #endif
1350
1351 extern int xfrm_sysctl_init(struct net *net);
1352 #ifdef CONFIG_SYSCTL
1353 extern void xfrm_sysctl_fini(struct net *net);
1354 #else
1355 static inline void xfrm_sysctl_fini(struct net *net)
1356 {
1357 }
1358 #endif
1359
1360 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1361 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1362                            int (*func)(struct xfrm_state *, int, void*), void *);
1363 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1364 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1365 extern struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1366                                           const xfrm_address_t *saddr,
1367                                           const struct flowi *fl,
1368                                           struct xfrm_tmpl *tmpl,
1369                                           struct xfrm_policy *pol, int *err,
1370                                           unsigned short family);
1371 extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1372                                                xfrm_address_t *daddr,
1373                                                xfrm_address_t *saddr,
1374                                                unsigned short family,
1375                                                u8 mode, u8 proto, u32 reqid);
1376 extern int xfrm_state_check_expire(struct xfrm_state *x);
1377 extern void xfrm_state_insert(struct xfrm_state *x);
1378 extern int xfrm_state_add(struct xfrm_state *x);
1379 extern int xfrm_state_update(struct xfrm_state *x);
1380 extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1381                                             const xfrm_address_t *daddr, __be32 spi,
1382                                             u8 proto, unsigned short family);
1383 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1384                                                    const xfrm_address_t *daddr,
1385                                                    const xfrm_address_t *saddr,
1386                                                    u8 proto,
1387                                                    unsigned short family);
1388 #ifdef CONFIG_XFRM_SUB_POLICY
1389 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1390                           int n, unsigned short family);
1391 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1392                            int n, unsigned short family);
1393 #else
1394 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1395                                  int n, unsigned short family)
1396 {
1397         return -ENOSYS;
1398 }
1399
1400 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1401                                   int n, unsigned short family)
1402 {
1403         return -ENOSYS;
1404 }
1405 #endif
1406
1407 struct xfrmk_sadinfo {
1408         u32 sadhcnt; /* current hash bkts */
1409         u32 sadhmcnt; /* max allowed hash bkts */
1410         u32 sadcnt; /* current running count */
1411 };
1412
1413 struct xfrmk_spdinfo {
1414         u32 incnt;
1415         u32 outcnt;
1416         u32 fwdcnt;
1417         u32 inscnt;
1418         u32 outscnt;
1419         u32 fwdscnt;
1420         u32 spdhcnt;
1421         u32 spdhmcnt;
1422 };
1423
1424 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark,
1425                                               u32 seq);
1426 extern int xfrm_state_delete(struct xfrm_state *x);
1427 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1428 extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1429 extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1430 extern u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1431 extern int xfrm_init_replay(struct xfrm_state *x);
1432 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1433 extern int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1434 extern int xfrm_init_state(struct xfrm_state *x);
1435 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1436 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1437                       int encap_type);
1438 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1439 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1440 extern int xfrm_output(struct sk_buff *skb);
1441 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1442 extern int xfrm4_extract_header(struct sk_buff *skb);
1443 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1444 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1445                            int encap_type);
1446 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1447 extern int xfrm4_rcv(struct sk_buff *skb);
1448
1449 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1450 {
1451         return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1452 }
1453
1454 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1455 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1456 extern int xfrm4_output(struct sk_buff *skb);
1457 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1458 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1459 extern int xfrm6_extract_header(struct sk_buff *skb);
1460 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1461 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1462 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1463 extern int xfrm6_rcv(struct sk_buff *skb);
1464 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1465                             xfrm_address_t *saddr, u8 proto);
1466 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1467 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1468 extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1469 extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, xfrm_address_t *saddr);
1470 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1471 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1472 extern int xfrm6_output(struct sk_buff *skb);
1473 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1474                                  u8 **prevhdr);
1475
1476 #ifdef CONFIG_XFRM
1477 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1478 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1479 #else
1480 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1481 {
1482         return -ENOPROTOOPT;
1483 }
1484
1485 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1486 {
1487         /* should not happen */
1488         kfree_skb(skb);
1489         return 0;
1490 }
1491 #endif
1492
1493 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1494
1495 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1496 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1497         int (*func)(struct xfrm_policy *, int, int, void*), void *);
1498 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1499 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1500 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1501                                           u8 type, int dir,
1502                                           struct xfrm_selector *sel,
1503                                           struct xfrm_sec_ctx *ctx, int delete,
1504                                           int *err);
1505 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err);
1506 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1507 u32 xfrm_get_acqseq(void);
1508 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1509 struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark,
1510                                  u8 mode, u32 reqid, u8 proto,
1511                                  const xfrm_address_t *daddr,
1512                                  const xfrm_address_t *saddr, int create,
1513                                  unsigned short family);
1514 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1515
1516 #ifdef CONFIG_XFRM_MIGRATE
1517 extern int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1518                       const struct xfrm_migrate *m, int num_bundles,
1519                       const struct xfrm_kmaddress *k);
1520 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1521 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1522                                               struct xfrm_migrate *m);
1523 extern int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1524                         struct xfrm_migrate *m, int num_bundles,
1525                         struct xfrm_kmaddress *k);
1526 #endif
1527
1528 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1529 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1530 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1531
1532 extern void xfrm_input_init(void);
1533 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1534
1535 extern void xfrm_probe_algs(void);
1536 extern int xfrm_count_auth_supported(void);
1537 extern int xfrm_count_enc_supported(void);
1538 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1539 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1540 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1541 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1542 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1543 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1544 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1545 extern struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1546 extern struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1547                                                    int probe);
1548
1549 struct hash_desc;
1550 struct scatterlist;
1551 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1552                               unsigned int);
1553
1554 static inline int xfrm_addr_cmp(const xfrm_address_t *a,
1555                                 const xfrm_address_t *b,
1556                                 int family)
1557 {
1558         switch (family) {
1559         default:
1560         case AF_INET:
1561                 return (__force u32)a->a4 - (__force u32)b->a4;
1562         case AF_INET6:
1563                 return ipv6_addr_cmp((struct in6_addr *)a,
1564                                      (struct in6_addr *)b);
1565         }
1566 }
1567
1568 static inline int xfrm_policy_id2dir(u32 index)
1569 {
1570         return index & 7;
1571 }
1572
1573 #ifdef CONFIG_XFRM
1574 static inline int xfrm_aevent_is_on(struct net *net)
1575 {
1576         struct sock *nlsk;
1577         int ret = 0;
1578
1579         rcu_read_lock();
1580         nlsk = rcu_dereference(net->xfrm.nlsk);
1581         if (nlsk)
1582                 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1583         rcu_read_unlock();
1584         return ret;
1585 }
1586 #endif
1587
1588 static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1589 {
1590         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1591 }
1592
1593 static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1594 {
1595         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1596 }
1597
1598 static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1599 {
1600         return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1601 }
1602
1603 #ifdef CONFIG_XFRM_MIGRATE
1604 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1605 {
1606         return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1607 }
1608
1609 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1610 {
1611         return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1612 }
1613
1614 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1615 {
1616         int i;
1617         for (i = 0; i < n; i++)
1618                 xfrm_state_put(*(states + i));
1619 }
1620
1621 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1622 {
1623         int i;
1624         for (i = 0; i < n; i++)
1625                 xfrm_state_delete(*(states + i));
1626 }
1627 #endif
1628
1629 #ifdef CONFIG_XFRM
1630 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1631 {
1632         return skb->sp->xvec[skb->sp->len - 1];
1633 }
1634 #endif
1635
1636 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1637 {
1638         if (attrs[XFRMA_MARK])
1639                 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1640         else
1641                 m->v = m->m = 0;
1642
1643         return m->v & m->m;
1644 }
1645
1646 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1647 {
1648         if (m->m | m->v)
1649                 NLA_PUT(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1650         return 0;
1651
1652 nla_put_failure:
1653         return -1;
1654 }
1655
1656 #endif  /* _NET_XFRM_H */