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 #ifdef CONFIG_XFRM_STATISTICS
  23 #include <net/snmp.h>
  24 #endif
  25
  26 #define XFRM_PROTO_ESP          50
  27 #define XFRM_PROTO_AH           51
  28 #define XFRM_PROTO_COMP         108
  29 #define XFRM_PROTO_IPIP         4
  30 #define XFRM_PROTO_IPV6         41
  31 #define XFRM_PROTO_ROUTING      IPPROTO_ROUTING
  32 #define XFRM_PROTO_DSTOPTS      IPPROTO_DSTOPTS
  33
  34 #define XFRM_ALIGN8(len)        (((len) + 7) & ~7)
  35 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
  36         MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
  37 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
  38         MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
  39
  40 #ifdef CONFIG_XFRM_STATISTICS
  41 #define XFRM_INC_STATS(net, field)      SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
  42 #define XFRM_INC_STATS_BH(net, field)   SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
  43 #define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
  44 #else
  45 #define XFRM_INC_STATS(net, field)      ((void)(net))
  46 #define XFRM_INC_STATS_BH(net, field)   ((void)(net))
  47 #define XFRM_INC_STATS_USER(net, field) ((void)(net))
  48 #endif
  49
  50 extern u32 sysctl_xfrm_aevent_etime;
  51 extern u32 sysctl_xfrm_aevent_rseqth;
  52 extern int sysctl_xfrm_larval_drop;
  53 extern u32 sysctl_xfrm_acq_expires;
  54
  55 extern struct mutex xfrm_cfg_mutex;
  56
  57 /* Organization of SPD aka "XFRM rules"
  58    ------------------------------------
  59
  60    Basic objects:
  61    - policy rule, struct xfrm_policy (=SPD entry)
  62    - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
  63    - instance of a transformer, struct xfrm_state (=SA)
  64    - template to clone xfrm_state, struct xfrm_tmpl
  65
  66    SPD is plain linear list of xfrm_policy rules, ordered by priority.
  67    (To be compatible with existing pfkeyv2 implementations,
  68    many rules with priority of 0x7fffffff are allowed to exist and
  69    such rules are ordered in an unpredictable way, thanks to bsd folks.)
  70
  71    Lookup is plain linear search until the first match with selector.
  72
  73    If "action" is "block", then we prohibit the flow, otherwise:
  74    if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
  75    policy entry has list of up to XFRM_MAX_DEPTH transformations,
  76    described by templates xfrm_tmpl. Each template is resolved
  77    to a complete xfrm_state (see below) and we pack bundle of transformations
  78    to a dst_entry returned to requestor.
  79
  80    dst -. xfrm  .-> xfrm_state #1
  81     |---. child .-> dst -. xfrm .-> xfrm_state #2
  82                      |---. child .-> dst -. xfrm .-> xfrm_state #3
  83                                       |---. child .-> NULL
  84
  85    Bundles are cached at xrfm_policy struct (field ->bundles).
  86
  87
  88    Resolution of xrfm_tmpl
  89    -----------------------
  90    Template contains:
  91    1. ->mode            Mode: transport or tunnel
  92    2. ->id.proto        Protocol: AH/ESP/IPCOMP
  93    3. ->id.daddr        Remote tunnel endpoint, ignored for transport mode.
  94       Q: allow to resolve security gateway?
  95    4. ->id.spi          If not zero, static SPI.
  96    5. ->saddr           Local tunnel endpoint, ignored for transport mode.
  97    6. ->algos           List of allowed algos. Plain bitmask now.
  98       Q: ealgos, aalgos, calgos. What a mess...
  99    7. ->share           Sharing mode.
 100       Q: how to implement private sharing mode? To add struct sock* to
 101       flow id?
 102
 103    Having this template we search through SAD searching for entries
 104    with appropriate mode/proto/algo, permitted by selector.
 105    If no appropriate entry found, it is requested from key manager.
 106
 107    PROBLEMS:
 108    Q: How to find all the bundles referring to a physical path for
 109       PMTU discovery? Seems, dst should contain list of all parents...
 110       and enter to infinite locking hierarchy disaster.
 111       No! It is easier, we will not search for them, let them find us.
 112       We add genid to each dst plus pointer to genid of raw IP route,
 113       pmtu disc will update pmtu on raw IP route and increase its genid.
 114       dst_check() will see this for top level and trigger resyncing
 115       metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
 116  */
 117
 118 struct xfrm_state_walk {
 119         struct list_head        all;
 120         u8                      state;
 121         union {
 122                 u8              dying;
 123                 u8              proto;
 124         };
 125         u32                     seq;
 126 };
 127
 128 /* Full description of state of transformer. */
 129 struct xfrm_state
 130 {
 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
 147         u32                     genid;
 148
 149         /* Key manager bits */
 150         struct xfrm_state_walk  km;
 151
 152         /* Parameters of this state. */
 153         struct {
 154                 u32             reqid;
 155                 u8              mode;
 156                 u8              replay_window;
 157                 u8              aalgo, ealgo, calgo;
 158                 u8              flags;
 159                 u16             family;
 160                 xfrm_address_t  saddr;
 161                 int             header_len;
 162                 int             trailer_len;
 163         } props;
 164
 165         struct xfrm_lifetime_cfg lft;
 166
 167         /* Data for transformer */
 168         struct xfrm_algo        *aalg;
 169         struct xfrm_algo        *ealg;
 170         struct xfrm_algo        *calg;
 171         struct xfrm_algo_aead   *aead;
 172
 173         /* Data for encapsulator */
 174         struct xfrm_encap_tmpl  *encap;
 175
 176         /* Data for care-of address */
 177         xfrm_address_t  *coaddr;
 178
 179         /* IPComp needs an IPIP tunnel for handling uncompressed packets */
 180         struct xfrm_state       *tunnel;
 181
 182         /* If a tunnel, number of users + 1 */
 183         atomic_t                tunnel_users;
 184
 185         /* State for replay detection */
 186         struct xfrm_replay_state replay;
 187
 188         /* Replay detection state at the time we sent the last notification */
 189         struct xfrm_replay_state preplay;
 190
 191         /* internal flag that only holds state for delayed aevent at the
 192          * moment
 193         */
 194         u32                     xflags;
 195
 196         /* Replay detection notification settings */
 197         u32                     replay_maxage;
 198         u32                     replay_maxdiff;
 199
 200         /* Replay detection notification timer */
 201         struct timer_list       rtimer;
 202
 203         /* Statistics */
 204         struct xfrm_stats       stats;
 205
 206         struct xfrm_lifetime_cur curlft;
 207         struct timer_list       timer;
 208
 209         /* Last used time */
 210         unsigned long           lastused;
 211
 212         /* Reference to data common to all the instances of this
 213          * transformer. */
 214         const struct xfrm_type  *type;
 215         struct xfrm_mode        *inner_mode;
 216         struct xfrm_mode        *inner_mode_iaf;
 217         struct xfrm_mode        *outer_mode;
 218
 219         /* Security context */
 220         struct xfrm_sec_ctx     *security;
 221
 222         /* Private data of this transformer, format is opaque,
 223          * interpreted by xfrm_type methods. */
 224         void                    *data;
 225 };
 226
 227 static inline struct net *xs_net(struct xfrm_state *x)
 228 {
 229         return read_pnet(&x->xs_net);
 230 }
 231
 232 /* xflags - make enum if more show up */
 233 #define XFRM_TIME_DEFER 1
 234
 235 enum {
 236         XFRM_STATE_VOID,
 237         XFRM_STATE_ACQ,
 238         XFRM_STATE_VALID,
 239         XFRM_STATE_ERROR,
 240         XFRM_STATE_EXPIRED,
 241         XFRM_STATE_DEAD
 242 };
 243
 244 /* callback structure passed from either netlink or pfkey */
 245 struct km_event
 246 {
 247         union {
 248                 u32 hard;
 249                 u32 proto;
 250                 u32 byid;
 251                 u32 aevent;
 252                 u32 type;
 253         } data;
 254
 255         u32     seq;
 256         u32     pid;
 257         u32     event;
 258         struct net *net;
 259 };
 260
 261 struct net_device;
 262 struct xfrm_type;
 263 struct xfrm_dst;
 264 struct xfrm_policy_afinfo {
 265         unsigned short          family;
 266         struct dst_ops          *dst_ops;
 267         void                    (*garbage_collect)(struct net *net);
 268         struct dst_entry        *(*dst_lookup)(struct net *net, int tos,
 269                                                xfrm_address_t *saddr,
 270                                                xfrm_address_t *daddr);
 271         int                     (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
 272         struct dst_entry        *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
 273         void                    (*decode_session)(struct sk_buff *skb,
 274                                                   struct flowi *fl,
 275                                                   int reverse);
 276         int                     (*get_tos)(struct flowi *fl);
 277         int                     (*init_path)(struct xfrm_dst *path,
 278                                              struct dst_entry *dst,
 279                                              int nfheader_len);
 280         int                     (*fill_dst)(struct xfrm_dst *xdst,
 281                                             struct net_device *dev);
 282 };
 283
 284 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
 285 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
 286 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
 287 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
 288
 289 struct xfrm_tmpl;
 290 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
 291 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
 292 extern int __xfrm_state_delete(struct xfrm_state *x);
 293
 294 struct xfrm_state_afinfo {
 295         unsigned int            family;
 296         unsigned int            proto;
 297         __be16                  eth_proto;
 298         struct module           *owner;
 299         const struct xfrm_type  *type_map[IPPROTO_MAX];
 300         struct xfrm_mode        *mode_map[XFRM_MODE_MAX];
 301         int                     (*init_flags)(struct xfrm_state *x);
 302         void                    (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
 303                                                 struct xfrm_tmpl *tmpl,
 304                                                 xfrm_address_t *daddr, xfrm_address_t *saddr);
 305         int                     (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
 306         int                     (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
 307         int                     (*output)(struct sk_buff *skb);
 308         int                     (*extract_input)(struct xfrm_state *x,
 309                                                  struct sk_buff *skb);
 310         int                     (*extract_output)(struct xfrm_state *x,
 311                                                   struct sk_buff *skb);
 312         int                     (*transport_finish)(struct sk_buff *skb,
 313                                                     int async);
 314 };
 315
 316 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
 317 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
 318
 319 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
 320
 321 struct xfrm_type
 322 {
 323         char                    *description;
 324         struct module           *owner;
 325         __u8                    proto;
 326         __u8                    flags;
 327 #define XFRM_TYPE_NON_FRAGMENT  1
 328 #define XFRM_TYPE_REPLAY_PROT   2
 329 #define XFRM_TYPE_LOCAL_COADDR  4
 330 #define XFRM_TYPE_REMOTE_COADDR 8
 331
 332         int                     (*init_state)(struct xfrm_state *x);
 333         void                    (*destructor)(struct xfrm_state *);
 334         int                     (*input)(struct xfrm_state *, struct sk_buff *skb);
 335         int                     (*output)(struct xfrm_state *, struct sk_buff *pskb);
 336         int                     (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
 337         int                     (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
 338         /* Estimate maximal size of result of transformation of a dgram */
 339         u32                     (*get_mtu)(struct xfrm_state *, int size);
 340 };
 341
 342 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
 343 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
 344
 345 struct xfrm_mode {
 346         /*
 347          * Remove encapsulation header.
 348          *
 349          * The IP header will be moved over the top of the encapsulation
 350          * header.
 351          *
 352          * On entry, the transport header shall point to where the IP header
 353          * should be and the network header shall be set to where the IP
 354          * header currently is.  skb->data shall point to the start of the
 355          * payload.
 356          */
 357         int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
 358
 359         /*
 360          * This is the actual input entry point.
 361          *
 362          * For transport mode and equivalent this would be identical to
 363          * input2 (which does not need to be set).  While tunnel mode
 364          * and equivalent would set this to the tunnel encapsulation function
 365          * xfrm4_prepare_input that would in turn call input2.
 366          */
 367         int (*input)(struct xfrm_state *x, struct sk_buff *skb);
 368
 369         /*
 370          * Add encapsulation header.
 371          *
 372          * On exit, the transport header will be set to the start of the
 373          * encapsulation header to be filled in by x->type->output and
 374          * the mac header will be set to the nextheader (protocol for
 375          * IPv4) field of the extension header directly preceding the
 376          * encapsulation header, or in its absence, that of the top IP
 377          * header.  The value of the network header will always point
 378          * to the top IP header while skb->data will point to the payload.
 379          */
 380         int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
 381
 382         /*
 383          * This is the actual output entry point.
 384          *
 385          * For transport mode and equivalent this would be identical to
 386          * output2 (which does not need to be set).  While tunnel mode
 387          * and equivalent would set this to a tunnel encapsulation function
 388          * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
 389          * call output2.
 390          */
 391         int (*output)(struct xfrm_state *x, struct sk_buff *skb);
 392
 393         struct xfrm_state_afinfo *afinfo;
 394         struct module *owner;
 395         unsigned int encap;
 396         int flags;
 397 };
 398
 399 /* Flags for xfrm_mode. */
 400 enum {
 401         XFRM_MODE_FLAG_TUNNEL = 1,
 402 };
 403
 404 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
 405 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
 406
 407 static inline int xfrm_af2proto(unsigned int family)
 408 {
 409         switch(family) {
 410         case AF_INET:
 411                 return IPPROTO_IPIP;
 412         case AF_INET6:
 413                 return IPPROTO_IPV6;
 414         default:
 415                 return 0;
 416         }
 417 }
 418
 419 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
 420 {
 421         if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
 422             (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
 423                 return x->inner_mode;
 424         else
 425                 return x->inner_mode_iaf;
 426 }
 427
 428 struct xfrm_tmpl
 429 {
 430 /* id in template is interpreted as:
 431  * daddr - destination of tunnel, may be zero for transport mode.
 432  * spi   - zero to acquire spi. Not zero if spi is static, then
 433  *         daddr must be fixed too.
 434  * proto - AH/ESP/IPCOMP
 435  */
 436         struct xfrm_id          id;
 437
 438 /* Source address of tunnel. Ignored, if it is not a tunnel. */
 439         xfrm_address_t          saddr;
 440
 441         unsigned short          encap_family;
 442
 443         __u32                   reqid;
 444
 445 /* Mode: transport, tunnel etc. */
 446         __u8                    mode;
 447
 448 /* Sharing mode: unique, this session only, this user only etc. */
 449         __u8                    share;
 450
 451 /* May skip this transfomration if no SA is found */
 452         __u8                    optional;
 453
 454 /* Skip aalgos/ealgos/calgos checks. */
 455         __u8                    allalgs;
 456
 457 /* Bit mask of algos allowed for acquisition */
 458         __u32                   aalgos;
 459         __u32                   ealgos;
 460         __u32                   calgos;
 461 };
 462
 463 #define XFRM_MAX_DEPTH          6
 464
 465 struct xfrm_policy_walk_entry {
 466         struct list_head        all;
 467         u8                      dead;
 468 };
 469
 470 struct xfrm_policy_walk {
 471         struct xfrm_policy_walk_entry walk;
 472         u8 type;
 473         u32 seq;
 474 };
 475
 476 struct xfrm_policy
 477 {
 478 #ifdef CONFIG_NET_NS
 479         struct net              *xp_net;
 480 #endif
 481         struct hlist_node       bydst;
 482         struct hlist_node       byidx;
 483
 484         /* This lock only affects elements except for entry. */
 485         rwlock_t                lock;
 486         atomic_t                refcnt;
 487         struct timer_list       timer;
 488
 489         u32                     priority;
 490         u32                     index;
 491         struct xfrm_selector    selector;
 492         struct xfrm_lifetime_cfg lft;
 493         struct xfrm_lifetime_cur curlft;
 494         struct dst_entry       *bundles;
 495         struct xfrm_policy_walk_entry walk;
 496         u8                      type;
 497         u8                      action;
 498         u8                      flags;
 499         u8                      xfrm_nr;
 500         u16                     family;
 501         struct xfrm_sec_ctx     *security;
 502         struct xfrm_tmpl        xfrm_vec[XFRM_MAX_DEPTH];
 503 };
 504
 505 static inline struct net *xp_net(struct xfrm_policy *xp)
 506 {
 507         return read_pnet(&xp->xp_net);
 508 }
 509
 510 struct xfrm_kmaddress {
 511         xfrm_address_t          local;
 512         xfrm_address_t          remote;
 513         u32                     reserved;
 514         u16                     family;
 515 };
 516
 517 struct xfrm_migrate {
 518         xfrm_address_t          old_daddr;
 519         xfrm_address_t          old_saddr;
 520         xfrm_address_t          new_daddr;
 521         xfrm_address_t          new_saddr;
 522         u8                      proto;
 523         u8                      mode;
 524         u16                     reserved;
 525         u32                     reqid;
 526         u16                     old_family;
 527         u16                     new_family;
 528 };
 529
 530 #define XFRM_KM_TIMEOUT                30
 531 /* which seqno */
 532 #define XFRM_REPLAY_SEQ         1
 533 #define XFRM_REPLAY_OSEQ        2
 534 #define XFRM_REPLAY_SEQ_MASK    3
 535 /* what happened */
 536 #define XFRM_REPLAY_UPDATE      XFRM_AE_CR
 537 #define XFRM_REPLAY_TIMEOUT     XFRM_AE_CE
 538
 539 /* default aevent timeout in units of 100ms */
 540 #define XFRM_AE_ETIME                   10
 541 /* Async Event timer multiplier */
 542 #define XFRM_AE_ETH_M                   10
 543 /* default seq threshold size */
 544 #define XFRM_AE_SEQT_SIZE               2
 545
 546 struct xfrm_mgr
 547 {
 548         struct list_head        list;
 549         char                    *id;
 550         int                     (*notify)(struct xfrm_state *x, struct km_event *c);
 551         int                     (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
 552         struct xfrm_policy      *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
 553         int                     (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
 554         int                     (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
 555         int                     (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
 556         int                     (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
 557 };
 558
 559 extern int xfrm_register_km(struct xfrm_mgr *km);
 560 extern int xfrm_unregister_km(struct xfrm_mgr *km);
 561
 562 /*
 563  * This structure is used for the duration where packets are being
 564  * transformed by IPsec.  As soon as the packet leaves IPsec the
 565  * area beyond the generic IP part may be overwritten.
 566  */
 567 struct xfrm_skb_cb {
 568         union {
 569                 struct inet_skb_parm h4;
 570                 struct inet6_skb_parm h6;
 571         } header;
 572
 573         /* Sequence number for replay protection. */
 574         union {
 575                 u64 output;
 576                 __be32 input;
 577         } seq;
 578 };
 579
 580 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
 581
 582 /*
 583  * This structure is used by the afinfo prepare_input/prepare_output functions
 584  * to transmit header information to the mode input/output functions.
 585  */
 586 struct xfrm_mode_skb_cb {
 587         union {
 588                 struct inet_skb_parm h4;
 589                 struct inet6_skb_parm h6;
 590         } header;
 591
 592         /* Copied from header for IPv4, always set to zero and DF for IPv6. */
 593         __be16 id;
 594         __be16 frag_off;
 595
 596         /* IP header length (excluding options or extension headers). */
 597         u8 ihl;
 598
 599         /* TOS for IPv4, class for IPv6. */
 600         u8 tos;
 601
 602         /* TTL for IPv4, hop limitfor IPv6. */
 603         u8 ttl;
 604
 605         /* Protocol for IPv4, NH for IPv6. */
 606         u8 protocol;
 607
 608         /* Option length for IPv4, zero for IPv6. */
 609         u8 optlen;
 610
 611         /* Used by IPv6 only, zero for IPv4. */
 612         u8 flow_lbl[3];
 613 };
 614
 615 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
 616
 617 /*
 618  * This structure is used by the input processing to locate the SPI and
 619  * related information.
 620  */
 621 struct xfrm_spi_skb_cb {
 622         union {
 623                 struct inet_skb_parm h4;
 624                 struct inet6_skb_parm h6;
 625         } header;
 626
 627         unsigned int daddroff;
 628         unsigned int family;
 629 };
 630
 631 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
 632
 633 /* Audit Information */
 634 struct xfrm_audit
 635 {
 636         u32     secid;
 637         uid_t   loginuid;
 638         u32     sessionid;
 639 };
 640
 641 #ifdef CONFIG_AUDITSYSCALL
 642 static inline struct audit_buffer *xfrm_audit_start(const char *op)
 643 {
 644         struct audit_buffer *audit_buf = NULL;
 645
 646         if (audit_enabled == 0)
 647                 return NULL;
 648         audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
 649                                     AUDIT_MAC_IPSEC_EVENT);
 650         if (audit_buf == NULL)
 651                 return NULL;
 652         audit_log_format(audit_buf, "op=%s", op);
 653         return audit_buf;
 654 }
 655
 656 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
 657                                              struct audit_buffer *audit_buf)
 658 {
 659         char *secctx;
 660         u32 secctx_len;
 661
 662         audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
 663         if (secid != 0 &&
 664             security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
 665                 audit_log_format(audit_buf, " subj=%s", secctx);
 666                 security_release_secctx(secctx, secctx_len);
 667         } else
 668                 audit_log_task_context(audit_buf);
 669 }
 670
 671 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 672                                   u32 auid, u32 ses, u32 secid);
 673 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 674                                   u32 auid, u32 ses, u32 secid);
 675 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
 676                                  u32 auid, u32 ses, u32 secid);
 677 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 678                                     u32 auid, u32 ses, u32 secid);
 679 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 680                                              struct sk_buff *skb);
 681 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
 682 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 683                                       __be32 net_spi, __be32 net_seq);
 684 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
 685                                      struct sk_buff *skb, u8 proto);
 686 #else
 687
 688 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 689                                   u32 auid, u32 ses, u32 secid)
 690 {
 691 }
 692
 693 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 694                                   u32 auid, u32 ses, u32 secid)
 695 {
 696 }
 697
 698 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
 699                                  u32 auid, u32 ses, u32 secid)
 700 {
 701 }
 702
 703 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 704                                     u32 auid, u32 ses, u32 secid)
 705 {
 706 }
 707
 708 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 709                                              struct sk_buff *skb)
 710 {
 711 }
 712
 713 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
 714                                       u16 family)
 715 {
 716 }
 717
 718 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 719                                       __be32 net_spi, __be32 net_seq)
 720 {
 721 }
 722
 723 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
 724                                      struct sk_buff *skb, u8 proto)
 725 {
 726 }
 727 #endif /* CONFIG_AUDITSYSCALL */
 728
 729 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
 730 {
 731         if (likely(policy != NULL))
 732                 atomic_inc(&policy->refcnt);
 733 }
 734
 735 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
 736
 737 static inline void xfrm_pol_put(struct xfrm_policy *policy)
 738 {
 739         if (atomic_dec_and_test(&policy->refcnt))
 740                 xfrm_policy_destroy(policy);
 741 }
 742
 743 #ifdef CONFIG_XFRM_SUB_POLICY
 744 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 745 {
 746         int i;
 747         for (i = npols - 1; i >= 0; --i)
 748                 xfrm_pol_put(pols[i]);
 749 }
 750 #else
 751 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 752 {
 753         xfrm_pol_put(pols[0]);
 754 }
 755 #endif
 756
 757 extern void __xfrm_state_destroy(struct xfrm_state *);
 758
 759 static inline void __xfrm_state_put(struct xfrm_state *x)
 760 {
 761         atomic_dec(&x->refcnt);
 762 }
 763
 764 static inline void xfrm_state_put(struct xfrm_state *x)
 765 {
 766         if (atomic_dec_and_test(&x->refcnt))
 767                 __xfrm_state_destroy(x);
 768 }
 769
 770 static inline void xfrm_state_hold(struct xfrm_state *x)
 771 {
 772         atomic_inc(&x->refcnt);
 773 }
 774
 775 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
 776 {
 777         __be32 *a1 = token1;
 778         __be32 *a2 = token2;
 779         int pdw;
 780         int pbi;
 781
 782         pdw = prefixlen >> 5;     /* num of whole __u32 in prefix */
 783         pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
 784
 785         if (pdw)
 786                 if (memcmp(a1, a2, pdw << 2))
 787                         return 0;
 788
 789         if (pbi) {
 790                 __be32 mask;
 791
 792                 mask = htonl((0xffffffff) << (32 - pbi));
 793
 794                 if ((a1[pdw] ^ a2[pdw]) & mask)
 795                         return 0;
 796         }
 797
 798         return 1;
 799 }
 800
 801 static __inline__
 802 __be16 xfrm_flowi_sport(struct flowi *fl)
 803 {
 804         __be16 port;
 805         switch(fl->proto) {
 806         case IPPROTO_TCP:
 807         case IPPROTO_UDP:
 808         case IPPROTO_UDPLITE:
 809         case IPPROTO_SCTP:
 810                 port = fl->fl_ip_sport;
 811                 break;
 812         case IPPROTO_ICMP:
 813         case IPPROTO_ICMPV6:
 814                 port = htons(fl->fl_icmp_type);
 815                 break;
 816         case IPPROTO_MH:
 817                 port = htons(fl->fl_mh_type);
 818                 break;
 819         default:
 820                 port = 0;       /*XXX*/
 821         }
 822         return port;
 823 }
 824
 825 static __inline__
 826 __be16 xfrm_flowi_dport(struct flowi *fl)
 827 {
 828         __be16 port;
 829         switch(fl->proto) {
 830         case IPPROTO_TCP:
 831         case IPPROTO_UDP:
 832         case IPPROTO_UDPLITE:
 833         case IPPROTO_SCTP:
 834                 port = fl->fl_ip_dport;
 835                 break;
 836         case IPPROTO_ICMP:
 837         case IPPROTO_ICMPV6:
 838                 port = htons(fl->fl_icmp_code);
 839                 break;
 840         default:
 841                 port = 0;       /*XXX*/
 842         }
 843         return port;
 844 }
 845
 846 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
 847                                unsigned short family);
 848
 849 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 850 /*      If neither has a context --> match
 851  *      Otherwise, both must have a context and the sids, doi, alg must match
 852  */
 853 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 854 {
 855         return ((!s1 && !s2) ||
 856                 (s1 && s2 &&
 857                  (s1->ctx_sid == s2->ctx_sid) &&
 858                  (s1->ctx_doi == s2->ctx_doi) &&
 859                  (s1->ctx_alg == s2->ctx_alg)));
 860 }
 861 #else
 862 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 863 {
 864         return 1;
 865 }
 866 #endif
 867
 868 /* A struct encoding bundle of transformations to apply to some set of flow.
 869  *
 870  * dst->child points to the next element of bundle.
 871  * dst->xfrm  points to an instanse of transformer.
 872  *
 873  * Due to unfortunate limitations of current routing cache, which we
 874  * have no time to fix, it mirrors struct rtable and bound to the same
 875  * routing key, including saddr,daddr. However, we can have many of
 876  * bundles differing by session id. All the bundles grow from a parent
 877  * policy rule.
 878  */
 879 struct xfrm_dst
 880 {
 881         union {
 882                 struct dst_entry        dst;
 883                 struct rtable           rt;
 884                 struct rt6_info         rt6;
 885         } u;
 886         struct dst_entry *route;
 887 #ifdef CONFIG_XFRM_SUB_POLICY
 888         struct flowi *origin;
 889         struct xfrm_selector *partner;
 890 #endif
 891         u32 genid;
 892         u32 route_mtu_cached;
 893         u32 child_mtu_cached;
 894         u32 route_cookie;
 895         u32 path_cookie;
 896 };
 897
 898 #ifdef CONFIG_XFRM
 899 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
 900 {
 901         dst_release(xdst->route);
 902         if (likely(xdst->u.dst.xfrm))
 903                 xfrm_state_put(xdst->u.dst.xfrm);
 904 #ifdef CONFIG_XFRM_SUB_POLICY
 905         kfree(xdst->origin);
 906         xdst->origin = NULL;
 907         kfree(xdst->partner);
 908         xdst->partner = NULL;
 909 #endif
 910 }
 911 #endif
 912
 913 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
 914
 915 struct sec_path
 916 {
 917         atomic_t                refcnt;
 918         int                     len;
 919         struct xfrm_state       *xvec[XFRM_MAX_DEPTH];
 920 };
 921
 922 static inline struct sec_path *
 923 secpath_get(struct sec_path *sp)
 924 {
 925         if (sp)
 926                 atomic_inc(&sp->refcnt);
 927         return sp;
 928 }
 929
 930 extern void __secpath_destroy(struct sec_path *sp);
 931
 932 static inline void
 933 secpath_put(struct sec_path *sp)
 934 {
 935         if (sp && atomic_dec_and_test(&sp->refcnt))
 936                 __secpath_destroy(sp);
 937 }
 938
 939 extern struct sec_path *secpath_dup(struct sec_path *src);
 940
 941 static inline void
 942 secpath_reset(struct sk_buff *skb)
 943 {
 944 #ifdef CONFIG_XFRM
 945         secpath_put(skb->sp);
 946         skb->sp = NULL;
 947 #endif
 948 }
 949
 950 static inline int
 951 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
 952 {
 953         switch (family) {
 954         case AF_INET:
 955                 return addr->a4 == 0;
 956         case AF_INET6:
 957                 return ipv6_addr_any((struct in6_addr *)&addr->a6);
 958         }
 959         return 0;
 960 }
 961
 962 static inline int
 963 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 964 {
 965         return  (tmpl->saddr.a4 &&
 966                  tmpl->saddr.a4 != x->props.saddr.a4);
 967 }
 968
 969 static inline int
 970 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
 971 {
 972         return  (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
 973                  ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
 974 }
 975
 976 static inline int
 977 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
 978 {
 979         switch (family) {
 980         case AF_INET:
 981                 return __xfrm4_state_addr_cmp(tmpl, x);
 982         case AF_INET6:
 983                 return __xfrm6_state_addr_cmp(tmpl, x);
 984         }
 985         return !0;
 986 }
 987
 988 #ifdef CONFIG_XFRM
 989 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
 990
 991 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
 992                                        struct sk_buff *skb,
 993                                        unsigned int family, int reverse)
 994 {
 995         struct net *net = dev_net(skb->dev);
 996         int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
 997
 998         if (sk && sk->sk_policy[XFRM_POLICY_IN])
 999                 return __xfrm_policy_check(sk, ndir, skb, family);
1000
1001         return  (!net->xfrm.policy_count[dir] && !skb->sp) ||
1002                 (skb->dst->flags & DST_NOPOLICY) ||
1003                 __xfrm_policy_check(sk, ndir, skb, family);
1004 }
1005
1006 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1007 {
1008         return __xfrm_policy_check2(sk, dir, skb, family, 0);
1009 }
1010
1011 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1012 {
1013         return xfrm_policy_check(sk, dir, skb, AF_INET);
1014 }
1015
1016 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1017 {
1018         return xfrm_policy_check(sk, dir, skb, AF_INET6);
1019 }
1020
1021 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1022                                              struct sk_buff *skb)
1023 {
1024         return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1025 }
1026
1027 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1028                                              struct sk_buff *skb)
1029 {
1030         return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1031 }
1032
1033 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1034                                  unsigned int family, int reverse);
1035
1036 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1037                                       unsigned int family)
1038 {
1039         return __xfrm_decode_session(skb, fl, family, 0);
1040 }
1041
1042 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1043                                               struct flowi *fl,
1044                                               unsigned int family)
1045 {
1046         return __xfrm_decode_session(skb, fl, family, 1);
1047 }
1048
1049 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1050
1051 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1052 {
1053         struct net *net = dev_net(skb->dev);
1054
1055         return  !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1056                 (skb->dst->flags & DST_NOXFRM) ||
1057                 __xfrm_route_forward(skb, family);
1058 }
1059
1060 static inline int xfrm4_route_forward(struct sk_buff *skb)
1061 {
1062         return xfrm_route_forward(skb, AF_INET);
1063 }
1064
1065 static inline int xfrm6_route_forward(struct sk_buff *skb)
1066 {
1067         return xfrm_route_forward(skb, AF_INET6);
1068 }
1069
1070 extern int __xfrm_sk_clone_policy(struct sock *sk);
1071
1072 static inline int xfrm_sk_clone_policy(struct sock *sk)
1073 {
1074         if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1075                 return __xfrm_sk_clone_policy(sk);
1076         return 0;
1077 }
1078
1079 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1080
1081 static inline void xfrm_sk_free_policy(struct sock *sk)
1082 {
1083         if (unlikely(sk->sk_policy[0] != NULL)) {
1084                 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1085                 sk->sk_policy[0] = NULL;
1086         }
1087         if (unlikely(sk->sk_policy[1] != NULL)) {
1088                 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1089                 sk->sk_policy[1] = NULL;
1090         }
1091 }
1092
1093 #else
1094
1095 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1096 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1097 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1098 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1099 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1100 {
1101         return 1;
1102 }
1103 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1104 {
1105         return 1;
1106 }
1107 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1108 {
1109         return 1;
1110 }
1111 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1112                                               struct flowi *fl,
1113                                               unsigned int family)
1114 {
1115         return -ENOSYS;
1116 }
1117 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1118                                              struct sk_buff *skb)
1119 {
1120         return 1;
1121 }
1122 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1123                                              struct sk_buff *skb)
1124 {
1125         return 1;
1126 }
1127 #endif
1128
1129 static __inline__
1130 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1131 {
1132         switch (family){
1133         case AF_INET:
1134                 return (xfrm_address_t *)&fl->fl4_dst;
1135         case AF_INET6:
1136                 return (xfrm_address_t *)&fl->fl6_dst;
1137         }
1138         return NULL;
1139 }
1140
1141 static __inline__
1142 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1143 {
1144         switch (family){
1145         case AF_INET:
1146                 return (xfrm_address_t *)&fl->fl4_src;
1147         case AF_INET6:
1148                 return (xfrm_address_t *)&fl->fl6_src;
1149         }
1150         return NULL;
1151 }
1152
1153 static __inline__
1154 void xfrm_flowi_addr_get(struct flowi *fl,
1155                          xfrm_address_t *saddr, xfrm_address_t *daddr,
1156                          unsigned short family)
1157 {
1158         switch(family) {
1159         case AF_INET:
1160                 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1161                 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1162                 break;
1163         case AF_INET6:
1164                 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1165                 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1166                 break;
1167         }
1168 }
1169
1170 static __inline__ int
1171 __xfrm4_state_addr_check(struct xfrm_state *x,
1172                          xfrm_address_t *daddr, xfrm_address_t *saddr)
1173 {
1174         if (daddr->a4 == x->id.daddr.a4 &&
1175             (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1176                 return 1;
1177         return 0;
1178 }
1179
1180 static __inline__ int
1181 __xfrm6_state_addr_check(struct xfrm_state *x,
1182                          xfrm_address_t *daddr, xfrm_address_t *saddr)
1183 {
1184         if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1185             (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1186              ipv6_addr_any((struct in6_addr *)saddr) ||
1187              ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1188                 return 1;
1189         return 0;
1190 }
1191
1192 static __inline__ int
1193 xfrm_state_addr_check(struct xfrm_state *x,
1194                       xfrm_address_t *daddr, xfrm_address_t *saddr,
1195                       unsigned short family)
1196 {
1197         switch (family) {
1198         case AF_INET:
1199                 return __xfrm4_state_addr_check(x, daddr, saddr);
1200         case AF_INET6:
1201                 return __xfrm6_state_addr_check(x, daddr, saddr);
1202         }
1203         return 0;
1204 }
1205
1206 static __inline__ int
1207 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1208                            unsigned short family)
1209 {
1210         switch (family) {
1211         case AF_INET:
1212                 return __xfrm4_state_addr_check(x,
1213                                                 (xfrm_address_t *)&fl->fl4_dst,
1214                                                 (xfrm_address_t *)&fl->fl4_src);
1215         case AF_INET6:
1216                 return __xfrm6_state_addr_check(x,
1217                                                 (xfrm_address_t *)&fl->fl6_dst,
1218                                                 (xfrm_address_t *)&fl->fl6_src);
1219         }
1220         return 0;
1221 }
1222
1223 static inline int xfrm_state_kern(struct xfrm_state *x)
1224 {
1225         return atomic_read(&x->tunnel_users);
1226 }
1227
1228 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1229 {
1230         return (!userproto || proto == userproto ||
1231                 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1232                                                   proto == IPPROTO_ESP ||
1233                                                   proto == IPPROTO_COMP)));
1234 }
1235
1236 /*
1237  * xfrm algorithm information
1238  */
1239 struct xfrm_algo_aead_info {
1240         u16 icv_truncbits;
1241 };
1242
1243 struct xfrm_algo_auth_info {
1244         u16 icv_truncbits;
1245         u16 icv_fullbits;
1246 };
1247
1248 struct xfrm_algo_encr_info {
1249         u16 blockbits;
1250         u16 defkeybits;
1251 };
1252
1253 struct xfrm_algo_comp_info {
1254         u16 threshold;
1255 };
1256
1257 struct xfrm_algo_desc {
1258         char *name;
1259         char *compat;
1260         u8 available:1;
1261         union {
1262                 struct xfrm_algo_aead_info aead;
1263                 struct xfrm_algo_auth_info auth;
1264                 struct xfrm_algo_encr_info encr;
1265                 struct xfrm_algo_comp_info comp;
1266         } uinfo;
1267         struct sadb_alg desc;
1268 };
1269
1270 /* XFRM tunnel handlers.  */
1271 struct xfrm_tunnel {
1272         int (*handler)(struct sk_buff *skb);
1273         int (*err_handler)(struct sk_buff *skb, __u32 info);
1274
1275         struct xfrm_tunnel *next;
1276         int priority;
1277 };
1278
1279 struct xfrm6_tunnel {
1280         int (*handler)(struct sk_buff *skb);
1281         int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1282                            int type, int code, int offset, __be32 info);
1283         struct xfrm6_tunnel *next;
1284         int priority;
1285 };
1286
1287 extern void xfrm_init(void);
1288 extern void xfrm4_init(void);
1289 extern int xfrm_state_init(struct net *net);
1290 extern void xfrm_state_fini(struct net *net);
1291 extern void xfrm4_state_init(void);
1292 #ifdef CONFIG_XFRM
1293 extern int xfrm6_init(void);
1294 extern void xfrm6_fini(void);
1295 extern int xfrm6_state_init(void);
1296 extern void xfrm6_state_fini(void);
1297 #else
1298 static inline int xfrm6_init(void)
1299 {
1300         return 0;
1301 }
1302 static inline void xfrm6_fini(void)
1303 {
1304         ;
1305 }
1306 #endif
1307
1308 #ifdef CONFIG_XFRM_STATISTICS
1309 extern int xfrm_proc_init(struct net *net);
1310 extern void xfrm_proc_fini(struct net *net);
1311 #endif
1312
1313 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1314 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1315                            int (*func)(struct xfrm_state *, int, void*), void *);
1316 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1317 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1318 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1319                                           struct flowi *fl, struct xfrm_tmpl *tmpl,
1320                                           struct xfrm_policy *pol, int *err,
1321                                           unsigned short family);
1322 extern struct xfrm_state * xfrm_stateonly_find(struct net *net,
1323                                                xfrm_address_t *daddr,
1324                                                xfrm_address_t *saddr,
1325                                                unsigned short family,
1326                                                u8 mode, u8 proto, u32 reqid);
1327 extern int xfrm_state_check_expire(struct xfrm_state *x);
1328 extern void xfrm_state_insert(struct xfrm_state *x);
1329 extern int xfrm_state_add(struct xfrm_state *x);
1330 extern int xfrm_state_update(struct xfrm_state *x);
1331 extern struct xfrm_state *xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1332 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1333 #ifdef CONFIG_XFRM_SUB_POLICY
1334 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1335                           int n, unsigned short family);
1336 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1337                            int n, unsigned short family);
1338 #else
1339 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1340                                  int n, unsigned short family)
1341 {
1342         return -ENOSYS;
1343 }
1344
1345 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1346                                   int n, unsigned short family)
1347 {
1348         return -ENOSYS;
1349 }
1350 #endif
1351
1352 struct xfrmk_sadinfo {
1353         u32 sadhcnt; /* current hash bkts */
1354         u32 sadhmcnt; /* max allowed hash bkts */
1355         u32 sadcnt; /* current running count */
1356 };
1357
1358 struct xfrmk_spdinfo {
1359         u32 incnt;
1360         u32 outcnt;
1361         u32 fwdcnt;
1362         u32 inscnt;
1363         u32 outscnt;
1364         u32 fwdscnt;
1365         u32 spdhcnt;
1366         u32 spdhmcnt;
1367 };
1368
1369 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 seq);
1370 extern int xfrm_state_delete(struct xfrm_state *x);
1371 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1372 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1373 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1374 extern int xfrm_replay_check(struct xfrm_state *x,
1375                              struct sk_buff *skb, __be32 seq);
1376 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1377 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1378 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1379 extern int xfrm_init_state(struct xfrm_state *x);
1380 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1381 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1382                       int encap_type);
1383 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1384 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1385 extern int xfrm_output(struct sk_buff *skb);
1386 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1387 extern int xfrm4_extract_header(struct sk_buff *skb);
1388 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1389 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1390                            int encap_type);
1391 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1392 extern int xfrm4_rcv(struct sk_buff *skb);
1393
1394 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1395 {
1396         return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1397 }
1398
1399 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1400 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1401 extern int xfrm4_output(struct sk_buff *skb);
1402 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1403 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1404 extern int xfrm6_extract_header(struct sk_buff *skb);
1405 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1406 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1407 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1408 extern int xfrm6_rcv(struct sk_buff *skb);
1409 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1410                             xfrm_address_t *saddr, u8 proto);
1411 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1412 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1413 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1414 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1415 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1416 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1417 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1418 extern int xfrm6_output(struct sk_buff *skb);
1419 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1420                                  u8 **prevhdr);
1421
1422 #ifdef CONFIG_XFRM
1423 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1424 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1425 #else
1426 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1427 {
1428         return -ENOPROTOOPT;
1429 }
1430
1431 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1432 {
1433         /* should not happen */
1434         kfree_skb(skb);
1435         return 0;
1436 }
1437 #endif
1438
1439 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1440
1441 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1442 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1443         int (*func)(struct xfrm_policy *, int, int, void*), void *);
1444 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1445 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1446 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u8 type, int dir,
1447                                           struct xfrm_selector *sel,
1448                                           struct xfrm_sec_ctx *ctx, int delete,
1449                                           int *err);
1450 struct xfrm_policy *xfrm_policy_byid(struct net *net, u8, int dir, u32 id, int delete, int *err);
1451 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1452 u32 xfrm_get_acqseq(void);
1453 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1454 struct xfrm_state * xfrm_find_acq(struct net *net, u8 mode, u32 reqid, u8 proto,
1455                                   xfrm_address_t *daddr, xfrm_address_t *saddr,
1456                                   int create, unsigned short family);
1457 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1458 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1459                           struct flowi *fl, int family, int strict);
1460
1461 #ifdef CONFIG_XFRM_MIGRATE
1462 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1463                       struct xfrm_migrate *m, int num_bundles,
1464                       struct xfrm_kmaddress *k);
1465 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1466 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1467                                               struct xfrm_migrate *m);
1468 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1469                         struct xfrm_migrate *m, int num_bundles,
1470                         struct xfrm_kmaddress *k);
1471 #endif
1472
1473 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1474 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1475 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1476
1477 extern void xfrm_input_init(void);
1478 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1479
1480 extern void xfrm_probe_algs(void);
1481 extern int xfrm_count_auth_supported(void);
1482 extern int xfrm_count_enc_supported(void);
1483 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1484 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1485 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1486 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1487 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1488 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1489 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1490 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1491 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1492                                                    int probe);
1493
1494 struct hash_desc;
1495 struct scatterlist;
1496 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1497                               unsigned int);
1498
1499 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1500                         int offset, int len, icv_update_fn_t icv_update);
1501
1502 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1503                                 int family)
1504 {
1505         switch (family) {
1506         default:
1507         case AF_INET:
1508                 return (__force __u32)a->a4 - (__force __u32)b->a4;
1509         case AF_INET6:
1510                 return ipv6_addr_cmp((struct in6_addr *)a,
1511                                      (struct in6_addr *)b);
1512         }
1513 }
1514
1515 static inline int xfrm_policy_id2dir(u32 index)
1516 {
1517         return index & 7;
1518 }
1519
1520 #ifdef CONFIG_XFRM
1521 static inline int xfrm_aevent_is_on(struct net *net)
1522 {
1523         struct sock *nlsk;
1524         int ret = 0;
1525
1526         rcu_read_lock();
1527         nlsk = rcu_dereference(net->xfrm.nlsk);
1528         if (nlsk)
1529                 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1530         rcu_read_unlock();
1531         return ret;
1532 }
1533 #endif
1534
1535 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1536 {
1537         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1538 }
1539
1540 #ifdef CONFIG_XFRM_MIGRATE
1541 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1542 {
1543         return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1544 }
1545
1546 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1547 {
1548         int i;
1549         for (i = 0; i < n; i++)
1550                 xfrm_state_put(*(states + i));
1551 }
1552
1553 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1554 {
1555         int i;
1556         for (i = 0; i < n; i++)
1557                 xfrm_state_delete(*(states + i));
1558 }
1559 #endif
1560
1561 #ifdef CONFIG_XFRM
1562 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1563 {
1564         return skb->sp->xvec[skb->sp->len - 1];
1565 }
1566 #endif
1567
1568 #endif  /* _NET_XFRM_H */