linux/include/net/xfrm.h
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   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
  56extern 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
 119struct 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. */
 130struct 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        /* used to fix curlft->add_time when changing date */
 217        long            saved_tmo;
 218
 219        /* Last used time */
 220        unsigned long           lastused;
 221
 222        /* Reference to data common to all the instances of this
 223         * transformer. */
 224        const struct xfrm_type  *type;
 225        struct xfrm_mode        *inner_mode;
 226        struct xfrm_mode        *inner_mode_iaf;
 227        struct xfrm_mode        *outer_mode;
 228
 229        /* Security context */
 230        struct xfrm_sec_ctx     *security;
 231
 232        /* Private data of this transformer, format is opaque,
 233         * interpreted by xfrm_type methods. */
 234        void                    *data;
 235};
 236
 237static inline struct net *xs_net(struct xfrm_state *x)
 238{
 239        return read_pnet(&x->xs_net);
 240}
 241
 242/* xflags - make enum if more show up */
 243#define XFRM_TIME_DEFER 1
 244#define XFRM_SOFT_EXPIRE 2
 245
 246enum {
 247        XFRM_STATE_VOID,
 248        XFRM_STATE_ACQ,
 249        XFRM_STATE_VALID,
 250        XFRM_STATE_ERROR,
 251        XFRM_STATE_EXPIRED,
 252        XFRM_STATE_DEAD
 253};
 254
 255/* callback structure passed from either netlink or pfkey */
 256struct km_event {
 257        union {
 258                u32 hard;
 259                u32 proto;
 260                u32 byid;
 261                u32 aevent;
 262                u32 type;
 263        } data;
 264
 265        u32     seq;
 266        u32     pid;
 267        u32     event;
 268        struct net *net;
 269};
 270
 271struct xfrm_replay {
 272        void    (*advance)(struct xfrm_state *x, __be32 net_seq);
 273        int     (*check)(struct xfrm_state *x,
 274                         struct sk_buff *skb,
 275                         __be32 net_seq);
 276        int     (*recheck)(struct xfrm_state *x,
 277                           struct sk_buff *skb,
 278                           __be32 net_seq);
 279        void    (*notify)(struct xfrm_state *x, int event);
 280        int     (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
 281};
 282
 283struct net_device;
 284struct xfrm_type;
 285struct xfrm_dst;
 286struct xfrm_policy_afinfo {
 287        unsigned short          family;
 288        struct dst_ops          *dst_ops;
 289        void                    (*garbage_collect)(struct net *net);
 290        struct dst_entry        *(*dst_lookup)(struct net *net, int tos,
 291                                               const xfrm_address_t *saddr,
 292                                               const xfrm_address_t *daddr);
 293        int                     (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
 294        void                    (*decode_session)(struct sk_buff *skb,
 295                                                  struct flowi *fl,
 296                                                  int reverse);
 297        int                     (*get_tos)(const struct flowi *fl);
 298        void                    (*init_dst)(struct net *net,
 299                                            struct xfrm_dst *dst);
 300        int                     (*init_path)(struct xfrm_dst *path,
 301                                             struct dst_entry *dst,
 302                                             int nfheader_len);
 303        int                     (*fill_dst)(struct xfrm_dst *xdst,
 304                                            struct net_device *dev,
 305                                            const struct flowi *fl);
 306        struct dst_entry        *(*blackhole_route)(struct net *net, struct dst_entry *orig);
 307};
 308
 309extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
 310extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
 311extern void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c);
 312extern void km_state_notify(struct xfrm_state *x, const struct km_event *c);
 313
 314struct xfrm_tmpl;
 315extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
 316extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
 317extern int __xfrm_state_delete(struct xfrm_state *x);
 318
 319struct xfrm_state_afinfo {
 320        unsigned int            family;
 321        unsigned int            proto;
 322        __be16                  eth_proto;
 323        struct module           *owner;
 324        const struct xfrm_type  *type_map[IPPROTO_MAX];
 325        struct xfrm_mode        *mode_map[XFRM_MODE_MAX];
 326        int                     (*init_flags)(struct xfrm_state *x);
 327        void                    (*init_tempsel)(struct xfrm_selector *sel,
 328                                                const struct flowi *fl);
 329        void                    (*init_temprop)(struct xfrm_state *x,
 330                                                const struct xfrm_tmpl *tmpl,
 331                                                const xfrm_address_t *daddr,
 332                                                const xfrm_address_t *saddr);
 333        int                     (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
 334        int                     (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
 335        int                     (*output)(struct sk_buff *skb);
 336        int                     (*output_finish)(struct sk_buff *skb);
 337        int                     (*extract_input)(struct xfrm_state *x,
 338                                                 struct sk_buff *skb);
 339        int                     (*extract_output)(struct xfrm_state *x,
 340                                                  struct sk_buff *skb);
 341        int                     (*transport_finish)(struct sk_buff *skb,
 342                                                    int async);
 343};
 344
 345extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
 346extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
 347
 348extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
 349
 350struct xfrm_type {
 351        char                    *description;
 352        struct module           *owner;
 353        u8                      proto;
 354        u8                      flags;
 355#define XFRM_TYPE_NON_FRAGMENT  1
 356#define XFRM_TYPE_REPLAY_PROT   2
 357#define XFRM_TYPE_LOCAL_COADDR  4
 358#define XFRM_TYPE_REMOTE_COADDR 8
 359
 360        int                     (*init_state)(struct xfrm_state *x);
 361        void                    (*destructor)(struct xfrm_state *);
 362        int                     (*input)(struct xfrm_state *, struct sk_buff *skb);
 363        int                     (*output)(struct xfrm_state *, struct sk_buff *pskb);
 364        int                     (*reject)(struct xfrm_state *, struct sk_buff *,
 365                                          const struct flowi *);
 366        int                     (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
 367        /* Estimate maximal size of result of transformation of a dgram */
 368        u32                     (*get_mtu)(struct xfrm_state *, int size);
 369};
 370
 371extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
 372extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
 373
 374struct xfrm_mode {
 375        /*
 376         * Remove encapsulation header.
 377         *
 378         * The IP header will be moved over the top of the encapsulation
 379         * header.
 380         *
 381         * On entry, the transport header shall point to where the IP header
 382         * should be and the network header shall be set to where the IP
 383         * header currently is.  skb->data shall point to the start of the
 384         * payload.
 385         */
 386        int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
 387
 388        /*
 389         * This is the actual input entry point.
 390         *
 391         * For transport mode and equivalent this would be identical to
 392         * input2 (which does not need to be set).  While tunnel mode
 393         * and equivalent would set this to the tunnel encapsulation function
 394         * xfrm4_prepare_input that would in turn call input2.
 395         */
 396        int (*input)(struct xfrm_state *x, struct sk_buff *skb);
 397
 398        /*
 399         * Add encapsulation header.
 400         *
 401         * On exit, the transport header will be set to the start of the
 402         * encapsulation header to be filled in by x->type->output and
 403         * the mac header will be set to the nextheader (protocol for
 404         * IPv4) field of the extension header directly preceding the
 405         * encapsulation header, or in its absence, that of the top IP
 406         * header.  The value of the network header will always point
 407         * to the top IP header while skb->data will point to the payload.
 408         */
 409        int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
 410
 411        /*
 412         * This is the actual output entry point.
 413         *
 414         * For transport mode and equivalent this would be identical to
 415         * output2 (which does not need to be set).  While tunnel mode
 416         * and equivalent would set this to a tunnel encapsulation function
 417         * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
 418         * call output2.
 419         */
 420        int (*output)(struct xfrm_state *x, struct sk_buff *skb);
 421
 422        struct xfrm_state_afinfo *afinfo;
 423        struct module *owner;
 424        unsigned int encap;
 425        int flags;
 426};
 427
 428/* Flags for xfrm_mode. */
 429enum {
 430        XFRM_MODE_FLAG_TUNNEL = 1,
 431};
 432
 433extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
 434extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
 435
 436static inline int xfrm_af2proto(unsigned int family)
 437{
 438        switch(family) {
 439        case AF_INET:
 440                return IPPROTO_IPIP;
 441        case AF_INET6:
 442                return IPPROTO_IPV6;
 443        default:
 444                return 0;
 445        }
 446}
 447
 448static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
 449{
 450        if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
 451            (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
 452                return x->inner_mode;
 453        else
 454                return x->inner_mode_iaf;
 455}
 456
 457struct xfrm_tmpl {
 458/* id in template is interpreted as:
 459 * daddr - destination of tunnel, may be zero for transport mode.
 460 * spi   - zero to acquire spi. Not zero if spi is static, then
 461 *         daddr must be fixed too.
 462 * proto - AH/ESP/IPCOMP
 463 */
 464        struct xfrm_id          id;
 465
 466/* Source address of tunnel. Ignored, if it is not a tunnel. */
 467        xfrm_address_t          saddr;
 468
 469        unsigned short          encap_family;
 470
 471        u32                     reqid;
 472
 473/* Mode: transport, tunnel etc. */
 474        u8                      mode;
 475
 476/* Sharing mode: unique, this session only, this user only etc. */
 477        u8                      share;
 478
 479/* May skip this transfomration if no SA is found */
 480        u8                      optional;
 481
 482/* Skip aalgos/ealgos/calgos checks. */
 483        u8                      allalgs;
 484
 485/* Bit mask of algos allowed for acquisition */
 486        u32                     aalgos;
 487        u32                     ealgos;
 488        u32                     calgos;
 489};
 490
 491#define XFRM_MAX_DEPTH          6
 492
 493struct xfrm_policy_walk_entry {
 494        struct list_head        all;
 495        u8                      dead;
 496};
 497
 498struct xfrm_policy_walk {
 499        struct xfrm_policy_walk_entry walk;
 500        u8 type;
 501        u32 seq;
 502};
 503
 504struct xfrm_policy {
 505#ifdef CONFIG_NET_NS
 506        struct net              *xp_net;
 507#endif
 508        struct hlist_node       bydst;
 509        struct hlist_node       byidx;
 510
 511        /* This lock only affects elements except for entry. */
 512        rwlock_t                lock;
 513        atomic_t                refcnt;
 514        struct timer_list       timer;
 515
 516        struct flow_cache_object flo;
 517        atomic_t                genid;
 518        u32                     priority;
 519        u32                     index;
 520        struct xfrm_mark        mark;
 521        struct xfrm_selector    selector;
 522        struct xfrm_lifetime_cfg lft;
 523        struct xfrm_lifetime_cur curlft;
 524        struct xfrm_policy_walk_entry walk;
 525        u8                      type;
 526        u8                      action;
 527        u8                      flags;
 528        u8                      xfrm_nr;
 529        u16                     family;
 530        struct xfrm_sec_ctx     *security;
 531        struct xfrm_tmpl        xfrm_vec[XFRM_MAX_DEPTH];
 532};
 533
 534static inline struct net *xp_net(const struct xfrm_policy *xp)
 535{
 536        return read_pnet(&xp->xp_net);
 537}
 538
 539struct xfrm_kmaddress {
 540        xfrm_address_t          local;
 541        xfrm_address_t          remote;
 542        u32                     reserved;
 543        u16                     family;
 544};
 545
 546struct xfrm_migrate {
 547        xfrm_address_t          old_daddr;
 548        xfrm_address_t          old_saddr;
 549        xfrm_address_t          new_daddr;
 550        xfrm_address_t          new_saddr;
 551        u8                      proto;
 552        u8                      mode;
 553        u16                     reserved;
 554        u32                     reqid;
 555        u16                     old_family;
 556        u16                     new_family;
 557};
 558
 559#define XFRM_KM_TIMEOUT                30
 560/* which seqno */
 561#define XFRM_REPLAY_SEQ         1
 562#define XFRM_REPLAY_OSEQ        2
 563#define XFRM_REPLAY_SEQ_MASK    3
 564/* what happened */
 565#define XFRM_REPLAY_UPDATE      XFRM_AE_CR
 566#define XFRM_REPLAY_TIMEOUT     XFRM_AE_CE
 567
 568/* default aevent timeout in units of 100ms */
 569#define XFRM_AE_ETIME                   10
 570/* Async Event timer multiplier */
 571#define XFRM_AE_ETH_M                   10
 572/* default seq threshold size */
 573#define XFRM_AE_SEQT_SIZE               2
 574
 575struct xfrm_mgr {
 576        struct list_head        list;
 577        char                    *id;
 578        int                     (*notify)(struct xfrm_state *x, const struct km_event *c);
 579        int                     (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
 580        struct xfrm_policy      *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
 581        int                     (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
 582        int                     (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
 583        int                     (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
 584        int                     (*migrate)(const struct xfrm_selector *sel,
 585                                           u8 dir, u8 type,
 586                                           const struct xfrm_migrate *m,
 587                                           int num_bundles,
 588                                           const struct xfrm_kmaddress *k);
 589};
 590
 591extern int xfrm_register_km(struct xfrm_mgr *km);
 592extern int xfrm_unregister_km(struct xfrm_mgr *km);
 593
 594/*
 595 * This structure is used for the duration where packets are being
 596 * transformed by IPsec.  As soon as the packet leaves IPsec the
 597 * area beyond the generic IP part may be overwritten.
 598 */
 599struct xfrm_skb_cb {
 600        union {
 601                struct inet_skb_parm h4;
 602                struct inet6_skb_parm h6;
 603        } header;
 604
 605        /* Sequence number for replay protection. */
 606        union {
 607                struct {
 608                        __u32 low;
 609                        __u32 hi;
 610                } output;
 611                struct {
 612                        __be32 low;
 613                        __be32 hi;
 614                } input;
 615        } seq;
 616};
 617
 618#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
 619
 620/*
 621 * This structure is used by the afinfo prepare_input/prepare_output functions
 622 * to transmit header information to the mode input/output functions.
 623 */
 624struct xfrm_mode_skb_cb {
 625        union {
 626                struct inet_skb_parm h4;
 627                struct inet6_skb_parm h6;
 628        } header;
 629
 630        /* Copied from header for IPv4, always set to zero and DF for IPv6. */
 631        __be16 id;
 632        __be16 frag_off;
 633
 634        /* IP header length (excluding options or extension headers). */
 635        u8 ihl;
 636
 637        /* TOS for IPv4, class for IPv6. */
 638        u8 tos;
 639
 640        /* TTL for IPv4, hop limitfor IPv6. */
 641        u8 ttl;
 642
 643        /* Protocol for IPv4, NH for IPv6. */
 644        u8 protocol;
 645
 646        /* Option length for IPv4, zero for IPv6. */
 647        u8 optlen;
 648
 649        /* Used by IPv6 only, zero for IPv4. */
 650        u8 flow_lbl[3];
 651};
 652
 653#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
 654
 655/*
 656 * This structure is used by the input processing to locate the SPI and
 657 * related information.
 658 */
 659struct xfrm_spi_skb_cb {
 660        union {
 661                struct inet_skb_parm h4;
 662                struct inet6_skb_parm h6;
 663        } header;
 664
 665        unsigned int daddroff;
 666        unsigned int family;
 667};
 668
 669#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
 670
 671/* Audit Information */
 672struct xfrm_audit {
 673        u32     secid;
 674        uid_t   loginuid;
 675        u32     sessionid;
 676};
 677
 678#ifdef CONFIG_AUDITSYSCALL
 679static inline struct audit_buffer *xfrm_audit_start(const char *op)
 680{
 681        struct audit_buffer *audit_buf = NULL;
 682
 683        if (audit_enabled == 0)
 684                return NULL;
 685        audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
 686                                    AUDIT_MAC_IPSEC_EVENT);
 687        if (audit_buf == NULL)
 688                return NULL;
 689        audit_log_format(audit_buf, "op=%s", op);
 690        return audit_buf;
 691}
 692
 693static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
 694                                             struct audit_buffer *audit_buf)
 695{
 696        char *secctx;
 697        u32 secctx_len;
 698
 699        audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
 700        if (secid != 0 &&
 701            security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
 702                audit_log_format(audit_buf, " subj=%s", secctx);
 703                security_release_secctx(secctx, secctx_len);
 704        } else
 705                audit_log_task_context(audit_buf);
 706}
 707
 708extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 709                                  u32 auid, u32 ses, u32 secid);
 710extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 711                                  u32 auid, u32 ses, u32 secid);
 712extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
 713                                 u32 auid, u32 ses, u32 secid);
 714extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 715                                    u32 auid, u32 ses, u32 secid);
 716extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 717                                             struct sk_buff *skb);
 718extern void xfrm_audit_state_replay(struct xfrm_state *x,
 719                                    struct sk_buff *skb, __be32 net_seq);
 720extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
 721extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 722                                      __be32 net_spi, __be32 net_seq);
 723extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
 724                                     struct sk_buff *skb, u8 proto);
 725#else
 726
 727static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 728                                  u32 auid, u32 ses, u32 secid)
 729{
 730}
 731
 732static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 733                                  u32 auid, u32 ses, u32 secid)
 734{
 735}
 736
 737static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
 738                                 u32 auid, u32 ses, u32 secid)
 739{
 740}
 741
 742static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 743                                    u32 auid, u32 ses, u32 secid)
 744{
 745}
 746
 747static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 748                                             struct sk_buff *skb)
 749{
 750}
 751
 752static inline void xfrm_audit_state_replay(struct xfrm_state *x,
 753                                           struct sk_buff *skb, __be32 net_seq)
 754{
 755}
 756
 757static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
 758                                      u16 family)
 759{
 760}
 761
 762static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 763                                      __be32 net_spi, __be32 net_seq)
 764{
 765}
 766
 767static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
 768                                     struct sk_buff *skb, u8 proto)
 769{
 770}
 771#endif /* CONFIG_AUDITSYSCALL */
 772
 773static inline void xfrm_pol_hold(struct xfrm_policy *policy)
 774{
 775        if (likely(policy != NULL))
 776                atomic_inc(&policy->refcnt);
 777}
 778
 779extern void xfrm_policy_destroy(struct xfrm_policy *policy);
 780
 781static inline void xfrm_pol_put(struct xfrm_policy *policy)
 782{
 783        if (atomic_dec_and_test(&policy->refcnt))
 784                xfrm_policy_destroy(policy);
 785}
 786
 787static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 788{
 789        int i;
 790        for (i = npols - 1; i >= 0; --i)
 791                xfrm_pol_put(pols[i]);
 792}
 793
 794extern void __xfrm_state_destroy(struct xfrm_state *);
 795
 796static inline void __xfrm_state_put(struct xfrm_state *x)
 797{
 798        atomic_dec(&x->refcnt);
 799}
 800
 801static inline void xfrm_state_put(struct xfrm_state *x)
 802{
 803        if (atomic_dec_and_test(&x->refcnt))
 804                __xfrm_state_destroy(x);
 805}
 806
 807static inline void xfrm_state_hold(struct xfrm_state *x)
 808{
 809        atomic_inc(&x->refcnt);
 810}
 811
 812static inline bool addr_match(const void *token1, const void *token2,
 813                              int prefixlen)
 814{
 815        const __be32 *a1 = token1;
 816        const __be32 *a2 = token2;
 817        int pdw;
 818        int pbi;
 819
 820        pdw = prefixlen >> 5;     /* num of whole u32 in prefix */
 821        pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
 822
 823        if (pdw)
 824                if (memcmp(a1, a2, pdw << 2))
 825                        return false;
 826
 827        if (pbi) {
 828                __be32 mask;
 829
 830                mask = htonl((0xffffffff) << (32 - pbi));
 831
 832                if ((a1[pdw] ^ a2[pdw]) & mask)
 833                        return false;
 834        }
 835
 836        return true;
 837}
 838
 839static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
 840{
 841        /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
 842        if (prefixlen == 0)
 843                return true;
 844        return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen)));
 845}
 846
 847static __inline__
 848__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
 849{
 850        __be16 port;
 851        switch(fl->flowi_proto) {
 852        case IPPROTO_TCP:
 853        case IPPROTO_UDP:
 854        case IPPROTO_UDPLITE:
 855        case IPPROTO_SCTP:
 856                port = uli->ports.sport;
 857                break;
 858        case IPPROTO_ICMP:
 859        case IPPROTO_ICMPV6:
 860                port = htons(uli->icmpt.type);
 861                break;
 862        case IPPROTO_MH:
 863                port = htons(uli->mht.type);
 864                break;
 865        case IPPROTO_GRE:
 866                port = htons(ntohl(uli->gre_key) >> 16);
 867                break;
 868        default:
 869                port = 0;       /*XXX*/
 870        }
 871        return port;
 872}
 873
 874static __inline__
 875__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
 876{
 877        __be16 port;
 878        switch(fl->flowi_proto) {
 879        case IPPROTO_TCP:
 880        case IPPROTO_UDP:
 881        case IPPROTO_UDPLITE:
 882        case IPPROTO_SCTP:
 883                port = uli->ports.dport;
 884                break;
 885        case IPPROTO_ICMP:
 886        case IPPROTO_ICMPV6:
 887                port = htons(uli->icmpt.code);
 888                break;
 889        case IPPROTO_GRE:
 890                port = htons(ntohl(uli->gre_key) & 0xffff);
 891                break;
 892        default:
 893                port = 0;       /*XXX*/
 894        }
 895        return port;
 896}
 897
 898extern bool xfrm_selector_match(const struct xfrm_selector *sel,
 899                                const struct flowi *fl,
 900                                unsigned short family);
 901
 902#ifdef CONFIG_SECURITY_NETWORK_XFRM
 903/*      If neither has a context --> match
 904 *      Otherwise, both must have a context and the sids, doi, alg must match
 905 */
 906static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 907{
 908        return ((!s1 && !s2) ||
 909                (s1 && s2 &&
 910                 (s1->ctx_sid == s2->ctx_sid) &&
 911                 (s1->ctx_doi == s2->ctx_doi) &&
 912                 (s1->ctx_alg == s2->ctx_alg)));
 913}
 914#else
 915static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 916{
 917        return true;
 918}
 919#endif
 920
 921/* A struct encoding bundle of transformations to apply to some set of flow.
 922 *
 923 * dst->child points to the next element of bundle.
 924 * dst->xfrm  points to an instanse of transformer.
 925 *
 926 * Due to unfortunate limitations of current routing cache, which we
 927 * have no time to fix, it mirrors struct rtable and bound to the same
 928 * routing key, including saddr,daddr. However, we can have many of
 929 * bundles differing by session id. All the bundles grow from a parent
 930 * policy rule.
 931 */
 932struct xfrm_dst {
 933        union {
 934                struct dst_entry        dst;
 935                struct rtable           rt;
 936                struct rt6_info         rt6;
 937        } u;
 938        struct dst_entry *route;
 939        struct flow_cache_object flo;
 940        struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
 941        int num_pols, num_xfrms;
 942#ifdef CONFIG_XFRM_SUB_POLICY
 943        struct flowi *origin;
 944        struct xfrm_selector *partner;
 945#endif
 946        u32 xfrm_genid;
 947        u32 policy_genid;
 948        u32 route_mtu_cached;
 949        u32 child_mtu_cached;
 950        u32 route_cookie;
 951        u32 path_cookie;
 952};
 953
 954#ifdef CONFIG_XFRM
 955static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
 956{
 957        xfrm_pols_put(xdst->pols, xdst->num_pols);
 958        dst_release(xdst->route);
 959        if (likely(xdst->u.dst.xfrm))
 960                xfrm_state_put(xdst->u.dst.xfrm);
 961#ifdef CONFIG_XFRM_SUB_POLICY
 962        kfree(xdst->origin);
 963        xdst->origin = NULL;
 964        kfree(xdst->partner);
 965        xdst->partner = NULL;
 966#endif
 967}
 968#endif
 969
 970extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
 971
 972struct sec_path {
 973        atomic_t                refcnt;
 974        int                     len;
 975        struct xfrm_state       *xvec[XFRM_MAX_DEPTH];
 976};
 977
 978static inline int secpath_exists(struct sk_buff *skb)
 979{
 980#ifdef CONFIG_XFRM
 981        return skb->sp != NULL;
 982#else
 983        return 0;
 984#endif
 985}
 986
 987static inline struct sec_path *
 988secpath_get(struct sec_path *sp)
 989{
 990        if (sp)
 991                atomic_inc(&sp->refcnt);
 992        return sp;
 993}
 994
 995extern void __secpath_destroy(struct sec_path *sp);
 996
 997static inline void
 998secpath_put(struct sec_path *sp)
 999{
1000        if (sp && atomic_dec_and_test(&sp->refcnt))
1001                __secpath_destroy(sp);
1002}
1003
1004extern struct sec_path *secpath_dup(struct sec_path *src);
1005
1006static inline void
1007secpath_reset(struct sk_buff *skb)
1008{
1009#ifdef CONFIG_XFRM
1010        secpath_put(skb->sp);
1011        skb->sp = NULL;
1012#endif
1013}
1014
1015static inline int
1016xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1017{
1018        switch (family) {
1019        case AF_INET:
1020                return addr->a4 == 0;
1021        case AF_INET6:
1022                return ipv6_addr_any((struct in6_addr *)&addr->a6);
1023        }
1024        return 0;
1025}
1026
1027static inline int
1028__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1029{
1030        return  (tmpl->saddr.a4 &&
1031                 tmpl->saddr.a4 != x->props.saddr.a4);
1032}
1033
1034static inline int
1035__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1036{
1037        return  (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1038                 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1039}
1040
1041static inline int
1042xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1043{
1044        switch (family) {
1045        case AF_INET:
1046                return __xfrm4_state_addr_cmp(tmpl, x);
1047        case AF_INET6:
1048                return __xfrm6_state_addr_cmp(tmpl, x);
1049        }
1050        return !0;
1051}
1052
1053#ifdef CONFIG_XFRM
1054extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
1055
1056static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1057                                       struct sk_buff *skb,
1058                                       unsigned int family, int reverse)
1059{
1060        struct net *net = dev_net(skb->dev);
1061        int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1062
1063        if (sk && sk->sk_policy[XFRM_POLICY_IN])
1064                return __xfrm_policy_check(sk, ndir, skb, family);
1065
1066        return  (!net->xfrm.policy_count[dir] && !skb->sp) ||
1067                (skb_dst(skb)->flags & DST_NOPOLICY) ||
1068                __xfrm_policy_check(sk, ndir, skb, family);
1069}
1070
1071static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1072{
1073        return __xfrm_policy_check2(sk, dir, skb, family, 0);
1074}
1075
1076static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1077{
1078        return xfrm_policy_check(sk, dir, skb, AF_INET);
1079}
1080
1081static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1082{
1083        return xfrm_policy_check(sk, dir, skb, AF_INET6);
1084}
1085
1086static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1087                                             struct sk_buff *skb)
1088{
1089        return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1090}
1091
1092static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1093                                             struct sk_buff *skb)
1094{
1095        return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1096}
1097
1098extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1099                                 unsigned int family, int reverse);
1100
1101static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1102                                      unsigned int family)
1103{
1104        return __xfrm_decode_session(skb, fl, family, 0);
1105}
1106
1107static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1108                                              struct flowi *fl,
1109                                              unsigned int family)
1110{
1111        return __xfrm_decode_session(skb, fl, family, 1);
1112}
1113
1114extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1115
1116static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1117{
1118        struct net *net = dev_net(skb->dev);
1119
1120        return  !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1121                (skb_dst(skb)->flags & DST_NOXFRM) ||
1122                __xfrm_route_forward(skb, family);
1123}
1124
1125static inline int xfrm4_route_forward(struct sk_buff *skb)
1126{
1127        return xfrm_route_forward(skb, AF_INET);
1128}
1129
1130static inline int xfrm6_route_forward(struct sk_buff *skb)
1131{
1132        return xfrm_route_forward(skb, AF_INET6);
1133}
1134
1135extern int __xfrm_sk_clone_policy(struct sock *sk);
1136
1137static inline int xfrm_sk_clone_policy(struct sock *sk)
1138{
1139        if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1140                return __xfrm_sk_clone_policy(sk);
1141        return 0;
1142}
1143
1144extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1145
1146static inline void xfrm_sk_free_policy(struct sock *sk)
1147{
1148        if (unlikely(sk->sk_policy[0] != NULL)) {
1149                xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1150                sk->sk_policy[0] = NULL;
1151        }
1152        if (unlikely(sk->sk_policy[1] != NULL)) {
1153                xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1154                sk->sk_policy[1] = NULL;
1155        }
1156}
1157
1158#else
1159
1160static inline void xfrm_sk_free_policy(struct sock *sk) {}
1161static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1162static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }  
1163static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 
1164static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1165{ 
1166        return 1; 
1167} 
1168static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1169{
1170        return 1;
1171}
1172static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1173{
1174        return 1;
1175}
1176static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1177                                              struct flowi *fl,
1178                                              unsigned int family)
1179{
1180        return -ENOSYS;
1181}
1182static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1183                                             struct sk_buff *skb)
1184{
1185        return 1;
1186}
1187static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1188                                             struct sk_buff *skb)
1189{
1190        return 1;
1191}
1192#endif
1193
1194static __inline__
1195xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1196{
1197        switch (family){
1198        case AF_INET:
1199                return (xfrm_address_t *)&fl->u.ip4.daddr;
1200        case AF_INET6:
1201                return (xfrm_address_t *)&fl->u.ip6.daddr;
1202        }
1203        return NULL;
1204}
1205
1206static __inline__
1207xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1208{
1209        switch (family){
1210        case AF_INET:
1211                return (xfrm_address_t *)&fl->u.ip4.saddr;
1212        case AF_INET6:
1213                return (xfrm_address_t *)&fl->u.ip6.saddr;
1214        }
1215        return NULL;
1216}
1217
1218static __inline__
1219void xfrm_flowi_addr_get(const struct flowi *fl,
1220                         xfrm_address_t *saddr, xfrm_address_t *daddr,
1221                         unsigned short family)
1222{
1223        switch(family) {
1224        case AF_INET:
1225                memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1226                memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1227                break;
1228        case AF_INET6:
1229                *(struct in6_addr *)saddr->a6 = fl->u.ip6.saddr;
1230                *(struct in6_addr *)daddr->a6 = fl->u.ip6.daddr;
1231                break;
1232        }
1233}
1234
1235static __inline__ int
1236__xfrm4_state_addr_check(const struct xfrm_state *x,
1237                         const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1238{
1239        if (daddr->a4 == x->id.daddr.a4 &&
1240            (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1241                return 1;
1242        return 0;
1243}
1244
1245static __inline__ int
1246__xfrm6_state_addr_check(const struct xfrm_state *x,
1247                         const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1248{
1249        if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1250            (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| 
1251             ipv6_addr_any((struct in6_addr *)saddr) || 
1252             ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1253                return 1;
1254        return 0;
1255}
1256
1257static __inline__ int
1258xfrm_state_addr_check(const struct xfrm_state *x,
1259                      const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1260                      unsigned short family)
1261{
1262        switch (family) {
1263        case AF_INET:
1264                return __xfrm4_state_addr_check(x, daddr, saddr);
1265        case AF_INET6:
1266                return __xfrm6_state_addr_check(x, daddr, saddr);
1267        }
1268        return 0;
1269}
1270
1271static __inline__ int
1272xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1273                           unsigned short family)
1274{
1275        switch (family) {
1276        case AF_INET:
1277                return __xfrm4_state_addr_check(x,
1278                                                (const xfrm_address_t *)&fl->u.ip4.daddr,
1279                                                (const xfrm_address_t *)&fl->u.ip4.saddr);
1280        case AF_INET6:
1281                return __xfrm6_state_addr_check(x,
1282                                                (const xfrm_address_t *)&fl->u.ip6.daddr,
1283                                                (const xfrm_address_t *)&fl->u.ip6.saddr);
1284        }
1285        return 0;
1286}
1287
1288static inline int xfrm_state_kern(const struct xfrm_state *x)
1289{
1290        return atomic_read(&x->tunnel_users);
1291}
1292
1293static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1294{
1295        return (!userproto || proto == userproto ||
1296                (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1297                                                  proto == IPPROTO_ESP ||
1298                                                  proto == IPPROTO_COMP)));
1299}
1300
1301/*
1302 * xfrm algorithm information
1303 */
1304struct xfrm_algo_aead_info {
1305        u16 icv_truncbits;
1306};
1307
1308struct xfrm_algo_auth_info {
1309        u16 icv_truncbits;
1310        u16 icv_fullbits;
1311};
1312
1313struct xfrm_algo_encr_info {
1314        u16 blockbits;
1315        u16 defkeybits;
1316};
1317
1318struct xfrm_algo_comp_info {
1319        u16 threshold;
1320};
1321
1322struct xfrm_algo_desc {
1323        char *name;
1324        char *compat;
1325        u8 available:1;
1326        union {
1327                struct xfrm_algo_aead_info aead;
1328                struct xfrm_algo_auth_info auth;
1329                struct xfrm_algo_encr_info encr;
1330                struct xfrm_algo_comp_info comp;
1331        } uinfo;
1332        struct sadb_alg desc;
1333};
1334
1335/* XFRM tunnel handlers.  */
1336struct xfrm_tunnel {
1337        int (*handler)(struct sk_buff *skb);
1338        int (*err_handler)(struct sk_buff *skb, u32 info);
1339
1340        struct xfrm_tunnel __rcu *next;
1341        int priority;
1342};
1343
1344struct xfrm6_tunnel {
1345        int (*handler)(struct sk_buff *skb);
1346        int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1347                           u8 type, u8 code, int offset, __be32 info);
1348        struct xfrm6_tunnel __rcu *next;
1349        int priority;
1350};
1351
1352extern void xfrm_init(void);
1353extern void xfrm4_init(int rt_hash_size);
1354extern int xfrm_state_init(struct net *net);
1355extern void xfrm_state_fini(struct net *net);
1356extern void xfrm4_state_init(void);
1357#ifdef CONFIG_XFRM
1358extern int xfrm6_init(void);
1359extern void xfrm6_fini(void);
1360extern int xfrm6_state_init(void);
1361extern void xfrm6_state_fini(void);
1362#else
1363static inline int xfrm6_init(void)
1364{
1365        return 0;
1366}
1367static inline void xfrm6_fini(void)
1368{
1369        ;
1370}
1371#endif
1372
1373#ifdef CONFIG_XFRM_STATISTICS
1374extern int xfrm_proc_init(struct net *net);
1375extern void xfrm_proc_fini(struct net *net);
1376#endif
1377
1378extern int xfrm_sysctl_init(struct net *net);
1379#ifdef CONFIG_SYSCTL
1380extern void xfrm_sysctl_fini(struct net *net);
1381#else
1382static inline void xfrm_sysctl_fini(struct net *net)
1383{
1384}
1385#endif
1386
1387extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1388extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1389                           int (*func)(struct xfrm_state *, int, void*), void *);
1390extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1391extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1392extern struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1393                                          const xfrm_address_t *saddr,
1394                                          const struct flowi *fl,
1395                                          struct xfrm_tmpl *tmpl,
1396                                          struct xfrm_policy *pol, int *err,
1397                                          unsigned short family);
1398extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1399                                               xfrm_address_t *daddr,
1400                                               xfrm_address_t *saddr,
1401                                               unsigned short family,
1402                                               u8 mode, u8 proto, u32 reqid);
1403extern int xfrm_state_check_expire(struct xfrm_state *x);
1404extern void xfrm_state_insert(struct xfrm_state *x);
1405extern int xfrm_state_add(struct xfrm_state *x);
1406extern int xfrm_state_update(struct xfrm_state *x);
1407extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1408                                            const xfrm_address_t *daddr, __be32 spi,
1409                                            u8 proto, unsigned short family);
1410extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1411                                                   const xfrm_address_t *daddr,
1412                                                   const xfrm_address_t *saddr,
1413                                                   u8 proto,
1414                                                   unsigned short family);
1415#ifdef CONFIG_XFRM_SUB_POLICY
1416extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1417                          int n, unsigned short family);
1418extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1419                           int n, unsigned short family);
1420#else
1421static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1422                                 int n, unsigned short family)
1423{
1424        return -ENOSYS;
1425}
1426
1427static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1428                                  int n, unsigned short family)
1429{
1430        return -ENOSYS;
1431}
1432#endif
1433
1434struct xfrmk_sadinfo {
1435        u32 sadhcnt; /* current hash bkts */
1436        u32 sadhmcnt; /* max allowed hash bkts */
1437        u32 sadcnt; /* current running count */
1438};
1439
1440struct xfrmk_spdinfo {
1441        u32 incnt;
1442        u32 outcnt;
1443        u32 fwdcnt;
1444        u32 inscnt;
1445        u32 outscnt;
1446        u32 fwdscnt;
1447        u32 spdhcnt;
1448        u32 spdhmcnt;
1449};
1450
1451extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark,
1452                                              u32 seq);
1453extern int xfrm_state_delete(struct xfrm_state *x);
1454extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1455extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1456extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1457extern u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1458extern int xfrm_init_replay(struct xfrm_state *x);
1459extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1460extern int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1461extern int xfrm_init_state(struct xfrm_state *x);
1462extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1463extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1464                      int encap_type);
1465extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1466extern int xfrm_output_resume(struct sk_buff *skb, int err);
1467extern int xfrm_output(struct sk_buff *skb);
1468extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1469extern int xfrm4_extract_header(struct sk_buff *skb);
1470extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1471extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1472                           int encap_type);
1473extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1474extern int xfrm4_rcv(struct sk_buff *skb);
1475
1476static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1477{
1478        return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1479}
1480
1481extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1482extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1483extern int xfrm4_output(struct sk_buff *skb);
1484extern int xfrm4_output_finish(struct sk_buff *skb);
1485extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1486extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1487extern int xfrm4_mode_tunnel_input_register(struct xfrm_tunnel *handler);
1488extern int xfrm4_mode_tunnel_input_deregister(struct xfrm_tunnel *handler);
1489extern int xfrm6_extract_header(struct sk_buff *skb);
1490extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1491extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1492extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1493extern int xfrm6_rcv(struct sk_buff *skb);
1494extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1495                            xfrm_address_t *saddr, u8 proto);
1496extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1497extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1498extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1499extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1500extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1501extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1502extern int xfrm6_output(struct sk_buff *skb);
1503extern int xfrm6_output_finish(struct sk_buff *skb);
1504extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1505                                 u8 **prevhdr);
1506
1507#ifdef CONFIG_XFRM
1508extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1509extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1510#else
1511static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1512{
1513        return -ENOPROTOOPT;
1514} 
1515
1516static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1517{
1518        /* should not happen */
1519        kfree_skb(skb);
1520        return 0;
1521}
1522#endif
1523
1524struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1525
1526extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1527extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1528        int (*func)(struct xfrm_policy *, int, int, void*), void *);
1529extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1530int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1531struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1532                                          u8 type, int dir,
1533                                          struct xfrm_selector *sel,
1534                                          struct xfrm_sec_ctx *ctx, int delete,
1535                                          int *err);
1536struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err);
1537int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1538u32 xfrm_get_acqseq(void);
1539extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1540struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark,
1541                                 u8 mode, u32 reqid, u8 proto,
1542                                 const xfrm_address_t *daddr,
1543                                 const xfrm_address_t *saddr, int create,
1544                                 unsigned short family);
1545extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1546
1547#ifdef CONFIG_XFRM_MIGRATE
1548extern int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1549                      const struct xfrm_migrate *m, int num_bundles,
1550                      const struct xfrm_kmaddress *k);
1551extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1552extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1553                                              struct xfrm_migrate *m);
1554extern int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1555                        struct xfrm_migrate *m, int num_bundles,
1556                        struct xfrm_kmaddress *k);
1557#endif
1558
1559extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1560extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1561extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1562
1563extern void xfrm_input_init(void);
1564extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1565
1566extern void xfrm_probe_algs(void);
1567extern int xfrm_count_auth_supported(void);
1568extern int xfrm_count_enc_supported(void);
1569extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1570extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1571extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1572extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1573extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1574extern struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1575extern struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1576extern struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1577extern struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1578                                                   int probe);
1579
1580static inline int xfrm_addr_cmp(const xfrm_address_t *a,
1581                                const xfrm_address_t *b,
1582                                int family)
1583{
1584        switch (family) {
1585        default:
1586        case AF_INET:
1587                return (__force u32)a->a4 - (__force u32)b->a4;
1588        case AF_INET6:
1589                return ipv6_addr_cmp((const struct in6_addr *)a,
1590                                     (const struct in6_addr *)b);
1591        }
1592}
1593
1594static inline int xfrm_policy_id2dir(u32 index)
1595{
1596        return index & 7;
1597}
1598
1599#ifdef CONFIG_XFRM
1600static inline int xfrm_aevent_is_on(struct net *net)
1601{
1602        struct sock *nlsk;
1603        int ret = 0;
1604
1605        rcu_read_lock();
1606        nlsk = rcu_dereference(net->xfrm.nlsk);
1607        if (nlsk)
1608                ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1609        rcu_read_unlock();
1610        return ret;
1611}
1612#endif
1613
1614static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1615{
1616        return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1617}
1618
1619static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1620{
1621        return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1622}
1623
1624static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1625{
1626        return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1627}
1628
1629#ifdef CONFIG_XFRM_MIGRATE
1630static inline int xfrm_replay_clone(struct xfrm_state *x,
1631                                     struct xfrm_state *orig)
1632{
1633        x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1634                                GFP_KERNEL);
1635        if (!x->replay_esn)
1636                return -ENOMEM;
1637
1638        x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1639        x->replay_esn->replay_window = orig->replay_esn->replay_window;
1640
1641        x->preplay_esn = kmemdup(x->replay_esn,
1642                                 xfrm_replay_state_esn_len(x->replay_esn),
1643                                 GFP_KERNEL);
1644        if (!x->preplay_esn) {
1645                kfree(x->replay_esn);
1646                return -ENOMEM;
1647        }
1648
1649        return 0;
1650}
1651
1652static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1653{
1654        return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1655}
1656
1657static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1658{
1659        return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1660}
1661
1662static inline void xfrm_states_put(struct xfrm_state **states, int n)
1663{
1664        int i;
1665        for (i = 0; i < n; i++)
1666                xfrm_state_put(*(states + i));
1667}
1668
1669static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1670{
1671        int i;
1672        for (i = 0; i < n; i++)
1673                xfrm_state_delete(*(states + i));
1674}
1675#endif
1676
1677#ifdef CONFIG_XFRM
1678static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1679{
1680        return skb->sp->xvec[skb->sp->len - 1];
1681}
1682#endif
1683
1684static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1685{
1686        if (attrs[XFRMA_MARK])
1687                memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1688        else
1689                m->v = m->m = 0;
1690
1691        return m->v & m->m;
1692}
1693
1694static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1695{
1696        int ret = 0;
1697
1698        if (m->m | m->v)
1699                ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1700        return ret;
1701}
1702
1703#endif  /* _NET_XFRM_H */
1704
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