include/net/xfrm.h

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This source file includes following definitions.
xs_net
xfrm_af2proto
xfrm_ip2inner_mode
xp_net
xfrm_audit_start
xfrm_audit_helper_usrinfo
xfrm_audit_policy_add
xfrm_audit_policy_delete
xfrm_audit_state_add
xfrm_audit_state_delete
xfrm_audit_state_replay_overflow
xfrm_audit_state_replay
xfrm_audit_state_notfound_simple
xfrm_audit_state_notfound
xfrm_audit_state_icvfail
xfrm_pol_hold
xfrm_pol_put
xfrm_pols_put
__xfrm_state_put
xfrm_state_put
xfrm_state_put_sync
xfrm_state_hold
addr_match
addr4_match
xfrm_flowi_sport
xfrm_flowi_dport
xfrm_sec_ctx_match
xfrm_sec_ctx_match
xfrm_dst_path
xfrm_dst_child
xfrm_dst_set_child
xfrm_dst_destroy
secpath_reset
xfrm_addr_any
__xfrm4_state_addr_cmp
__xfrm6_state_addr_cmp
xfrm_state_addr_cmp
__xfrm_policy_check2
xfrm_policy_check
xfrm4_policy_check
xfrm6_policy_check
xfrm4_policy_check_reverse
xfrm6_policy_check_reverse
xfrm_decode_session
xfrm_decode_session_reverse
xfrm_route_forward
xfrm4_route_forward
xfrm6_route_forward
xfrm_sk_clone_policy
xfrm_sk_free_policy
xfrm_sk_free_policy
xfrm_sk_clone_policy
xfrm6_route_forward
xfrm4_route_forward
xfrm6_policy_check
xfrm4_policy_check
xfrm_policy_check
xfrm_decode_session_reverse
xfrm4_policy_check_reverse
xfrm6_policy_check_reverse
xfrm_flowi_daddr
xfrm_flowi_saddr
xfrm_flowi_addr_get
__xfrm4_state_addr_check
__xfrm6_state_addr_check
xfrm_state_addr_check
xfrm_state_addr_flow_check
xfrm_state_kern
xfrm_id_proto_valid
xfrm_id_proto_match
xfrm6_init
xfrm6_fini
xfrm_sysctl_fini
xfrm_tmpl_sort
xfrm_state_sort
xfrm4_rcv_spi
xfrm_user_policy
xfrm4_udp_encap_rcv
xfrm6_addr_equal
xfrm_addr_equal
xfrm_policy_id2dir
xfrm_aevent_is_on
xfrm_acquire_is_on
aead_len
xfrm_alg_len
xfrm_alg_auth_len
xfrm_replay_state_esn_len
xfrm_replay_clone
xfrm_algo_aead_clone
xfrm_algo_clone
xfrm_algo_auth_clone
xfrm_states_put
xfrm_states_delete
xfrm_input_state
xfrm_dev_state_advance_esn
xfrm_dst_offload_ok
xfrm_dev_state_delete
xfrm_dev_state_free
xfrm_dev_resume
xfrm_dev_backlog
validate_xmit_xfrm
xfrm_dev_state_add
xfrm_dev_state_delete
xfrm_dev_state_free
xfrm_dev_offload_ok
xfrm_dev_state_advance_esn
xfrm_dst_offload_ok
xfrm_mark_get
xfrm_mark_put
xfrm_smark_get
xfrm_if_id_put
xfrm_tunnel_check
   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _NET_XFRM_H
   3 #define _NET_XFRM_H
   4 
   5 #include <linux/compiler.h>
   6 #include <linux/xfrm.h>
   7 #include <linux/spinlock.h>
   8 #include <linux/list.h>
   9 #include <linux/skbuff.h>
  10 #include <linux/socket.h>
  11 #include <linux/pfkeyv2.h>
  12 #include <linux/ipsec.h>
  13 #include <linux/in6.h>
  14 #include <linux/mutex.h>
  15 #include <linux/audit.h>
  16 #include <linux/slab.h>
  17 #include <linux/refcount.h>
  18 
  19 #include <net/sock.h>
  20 #include <net/dst.h>
  21 #include <net/ip.h>
  22 #include <net/route.h>
  23 #include <net/ipv6.h>
  24 #include <net/ip6_fib.h>
  25 #include <net/flow.h>
  26 #include <net/gro_cells.h>
  27 
  28 #include <linux/interrupt.h>
  29 
  30 #ifdef CONFIG_XFRM_STATISTICS
  31 #include <net/snmp.h>
  32 #endif
  33 
  34 #define XFRM_PROTO_ESP          50
  35 #define XFRM_PROTO_AH           51
  36 #define XFRM_PROTO_COMP         108
  37 #define XFRM_PROTO_IPIP         4
  38 #define XFRM_PROTO_IPV6         41
  39 #define XFRM_PROTO_ROUTING      IPPROTO_ROUTING
  40 #define XFRM_PROTO_DSTOPTS      IPPROTO_DSTOPTS
  41 
  42 #define XFRM_ALIGN4(len)        (((len) + 3) & ~3)
  43 #define XFRM_ALIGN8(len)        (((len) + 7) & ~7)
  44 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
  45         MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
  46 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
  47         MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
  48 #define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
  49         MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
  50 
  51 #ifdef CONFIG_XFRM_STATISTICS
  52 #define XFRM_INC_STATS(net, field)      SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
  53 #else
  54 #define XFRM_INC_STATS(net, field)      ((void)(net))
  55 #endif
  56 
  57 
  58 /* Organization of SPD aka "XFRM rules"
  59    ------------------------------------
  60 
  61    Basic objects:
  62    - policy rule, struct xfrm_policy (=SPD entry)
  63    - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
  64    - instance of a transformer, struct xfrm_state (=SA)
  65    - template to clone xfrm_state, struct xfrm_tmpl
  66 
  67    SPD is plain linear list of xfrm_policy rules, ordered by priority.
  68    (To be compatible with existing pfkeyv2 implementations,
  69    many rules with priority of 0x7fffffff are allowed to exist and
  70    such rules are ordered in an unpredictable way, thanks to bsd folks.)
  71 
  72    Lookup is plain linear search until the first match with selector.
  73 
  74    If "action" is "block", then we prohibit the flow, otherwise:
  75    if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
  76    policy entry has list of up to XFRM_MAX_DEPTH transformations,
  77    described by templates xfrm_tmpl. Each template is resolved
  78    to a complete xfrm_state (see below) and we pack bundle of transformations
  79    to a dst_entry returned to requestor.
  80 
  81    dst -. xfrm  .-> xfrm_state #1
  82     |---. child .-> dst -. xfrm .-> xfrm_state #2
  83                      |---. child .-> dst -. xfrm .-> xfrm_state #3
  84                                       |---. child .-> NULL
  85 
  86    Bundles are cached at xrfm_policy struct (field ->bundles).
  87 
  88 
  89    Resolution of xrfm_tmpl
  90    -----------------------
  91    Template contains:
  92    1. ->mode            Mode: transport or tunnel
  93    2. ->id.proto        Protocol: AH/ESP/IPCOMP
  94    3. ->id.daddr        Remote tunnel endpoint, ignored for transport mode.
  95       Q: allow to resolve security gateway?
  96    4. ->id.spi          If not zero, static SPI.
  97    5. ->saddr           Local tunnel endpoint, ignored for transport mode.
  98    6. ->algos           List of allowed algos. Plain bitmask now.
  99       Q: ealgos, aalgos, calgos. What a mess...
 100    7. ->share           Sharing mode.
 101       Q: how to implement private sharing mode? To add struct sock* to
 102       flow id?
 103 
 104    Having this template we search through SAD searching for entries
 105    with appropriate mode/proto/algo, permitted by selector.
 106    If no appropriate entry found, it is requested from key manager.
 107 
 108    PROBLEMS:
 109    Q: How to find all the bundles referring to a physical path for
 110       PMTU discovery? Seems, dst should contain list of all parents...
 111       and enter to infinite locking hierarchy disaster.
 112       No! It is easier, we will not search for them, let them find us.
 113       We add genid to each dst plus pointer to genid of raw IP route,
 114       pmtu disc will update pmtu on raw IP route and increase its genid.
 115       dst_check() will see this for top level and trigger resyncing
 116       metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
 117  */
 118 
 119 struct xfrm_state_walk {
 120         struct list_head        all;
 121         u8                      state;
 122         u8                      dying;
 123         u8                      proto;
 124         u32                     seq;
 125         struct xfrm_address_filter *filter;
 126 };
 127 
 128 struct xfrm_state_offload {
 129         struct net_device       *dev;
 130         unsigned long           offload_handle;
 131         unsigned int            num_exthdrs;
 132         u8                      flags;
 133 };
 134 
 135 struct xfrm_mode {
 136         u8 encap;
 137         u8 family;
 138         u8 flags;
 139 };
 140 
 141 /* Flags for xfrm_mode. */
 142 enum {
 143         XFRM_MODE_FLAG_TUNNEL = 1,
 144 };
 145 
 146 /* Full description of state of transformer. */
 147 struct xfrm_state {
 148         possible_net_t          xs_net;
 149         union {
 150                 struct hlist_node       gclist;
 151                 struct hlist_node       bydst;
 152         };
 153         struct hlist_node       bysrc;
 154         struct hlist_node       byspi;
 155 
 156         refcount_t              refcnt;
 157         spinlock_t              lock;
 158 
 159         struct xfrm_id          id;
 160         struct xfrm_selector    sel;
 161         struct xfrm_mark        mark;
 162         u32                     if_id;
 163         u32                     tfcpad;
 164 
 165         u32                     genid;
 166 
 167         /* Key manager bits */
 168         struct xfrm_state_walk  km;
 169 
 170         /* Parameters of this state. */
 171         struct {
 172                 u32             reqid;
 173                 u8              mode;
 174                 u8              replay_window;
 175                 u8              aalgo, ealgo, calgo;
 176                 u8              flags;
 177                 u16             family;
 178                 xfrm_address_t  saddr;
 179                 int             header_len;
 180                 int             trailer_len;
 181                 u32             extra_flags;
 182                 struct xfrm_mark        smark;
 183         } props;
 184 
 185         struct xfrm_lifetime_cfg lft;
 186 
 187         /* Data for transformer */
 188         struct xfrm_algo_auth   *aalg;
 189         struct xfrm_algo        *ealg;
 190         struct xfrm_algo        *calg;
 191         struct xfrm_algo_aead   *aead;
 192         const char              *geniv;
 193 
 194         /* Data for encapsulator */
 195         struct xfrm_encap_tmpl  *encap;
 196 
 197         /* Data for care-of address */
 198         xfrm_address_t  *coaddr;
 199 
 200         /* IPComp needs an IPIP tunnel for handling uncompressed packets */
 201         struct xfrm_state       *tunnel;
 202 
 203         /* If a tunnel, number of users + 1 */
 204         atomic_t                tunnel_users;
 205 
 206         /* State for replay detection */
 207         struct xfrm_replay_state replay;
 208         struct xfrm_replay_state_esn *replay_esn;
 209 
 210         /* Replay detection state at the time we sent the last notification */
 211         struct xfrm_replay_state preplay;
 212         struct xfrm_replay_state_esn *preplay_esn;
 213 
 214         /* The functions for replay detection. */
 215         const struct xfrm_replay *repl;
 216 
 217         /* internal flag that only holds state for delayed aevent at the
 218          * moment
 219         */
 220         u32                     xflags;
 221 
 222         /* Replay detection notification settings */
 223         u32                     replay_maxage;
 224         u32                     replay_maxdiff;
 225 
 226         /* Replay detection notification timer */
 227         struct timer_list       rtimer;
 228 
 229         /* Statistics */
 230         struct xfrm_stats       stats;
 231 
 232         struct xfrm_lifetime_cur curlft;
 233         struct hrtimer          mtimer;
 234 
 235         struct xfrm_state_offload xso;
 236 
 237         /* used to fix curlft->add_time when changing date */
 238         long            saved_tmo;
 239 
 240         /* Last used time */
 241         time64_t                lastused;
 242 
 243         struct page_frag xfrag;
 244 
 245         /* Reference to data common to all the instances of this
 246          * transformer. */
 247         const struct xfrm_type  *type;
 248         struct xfrm_mode        inner_mode;
 249         struct xfrm_mode        inner_mode_iaf;
 250         struct xfrm_mode        outer_mode;
 251 
 252         const struct xfrm_type_offload  *type_offload;
 253 
 254         /* Security context */
 255         struct xfrm_sec_ctx     *security;
 256 
 257         /* Private data of this transformer, format is opaque,
 258          * interpreted by xfrm_type methods. */
 259         void                    *data;
 260 };
 261 
 262 static inline struct net *xs_net(struct xfrm_state *x)
 263 {
 264         return read_pnet(&x->xs_net);
 265 }
 266 
 267 /* xflags - make enum if more show up */
 268 #define XFRM_TIME_DEFER 1
 269 #define XFRM_SOFT_EXPIRE 2
 270 
 271 enum {
 272         XFRM_STATE_VOID,
 273         XFRM_STATE_ACQ,
 274         XFRM_STATE_VALID,
 275         XFRM_STATE_ERROR,
 276         XFRM_STATE_EXPIRED,
 277         XFRM_STATE_DEAD
 278 };
 279 
 280 /* callback structure passed from either netlink or pfkey */
 281 struct km_event {
 282         union {
 283                 u32 hard;
 284                 u32 proto;
 285                 u32 byid;
 286                 u32 aevent;
 287                 u32 type;
 288         } data;
 289 
 290         u32     seq;
 291         u32     portid;
 292         u32     event;
 293         struct net *net;
 294 };
 295 
 296 struct xfrm_replay {
 297         void    (*advance)(struct xfrm_state *x, __be32 net_seq);
 298         int     (*check)(struct xfrm_state *x,
 299                          struct sk_buff *skb,
 300                          __be32 net_seq);
 301         int     (*recheck)(struct xfrm_state *x,
 302                            struct sk_buff *skb,
 303                            __be32 net_seq);
 304         void    (*notify)(struct xfrm_state *x, int event);
 305         int     (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
 306 };
 307 
 308 struct xfrm_if_cb {
 309         struct xfrm_if  *(*decode_session)(struct sk_buff *skb,
 310                                            unsigned short family);
 311 };
 312 
 313 void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);
 314 void xfrm_if_unregister_cb(void);
 315 
 316 struct net_device;
 317 struct xfrm_type;
 318 struct xfrm_dst;
 319 struct xfrm_policy_afinfo {
 320         struct dst_ops          *dst_ops;
 321         struct dst_entry        *(*dst_lookup)(struct net *net,
 322                                                int tos, int oif,
 323                                                const xfrm_address_t *saddr,
 324                                                const xfrm_address_t *daddr,
 325                                                u32 mark);
 326         int                     (*get_saddr)(struct net *net, int oif,
 327                                              xfrm_address_t *saddr,
 328                                              xfrm_address_t *daddr,
 329                                              u32 mark);
 330         int                     (*fill_dst)(struct xfrm_dst *xdst,
 331                                             struct net_device *dev,
 332                                             const struct flowi *fl);
 333         struct dst_entry        *(*blackhole_route)(struct net *net, struct dst_entry *orig);
 334 };
 335 
 336 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
 337 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
 338 void km_policy_notify(struct xfrm_policy *xp, int dir,
 339                       const struct km_event *c);
 340 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
 341 
 342 struct xfrm_tmpl;
 343 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
 344              struct xfrm_policy *pol);
 345 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
 346 int __xfrm_state_delete(struct xfrm_state *x);
 347 
 348 struct xfrm_state_afinfo {
 349         u8                              family;
 350         u8                              proto;
 351 
 352         const struct xfrm_type_offload *type_offload_esp;
 353 
 354         const struct xfrm_type          *type_esp;
 355         const struct xfrm_type          *type_ipip;
 356         const struct xfrm_type          *type_ipip6;
 357         const struct xfrm_type          *type_comp;
 358         const struct xfrm_type          *type_ah;
 359         const struct xfrm_type          *type_routing;
 360         const struct xfrm_type          *type_dstopts;
 361 
 362         int                     (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
 363         int                     (*output_finish)(struct sock *sk, struct sk_buff *skb);
 364         int                     (*extract_input)(struct xfrm_state *x,
 365                                                  struct sk_buff *skb);
 366         int                     (*extract_output)(struct xfrm_state *x,
 367                                                   struct sk_buff *skb);
 368         int                     (*transport_finish)(struct sk_buff *skb,
 369                                                     int async);
 370         void                    (*local_error)(struct sk_buff *skb, u32 mtu);
 371 };
 372 
 373 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
 374 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
 375 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
 376 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
 377 
 378 struct xfrm_input_afinfo {
 379         unsigned int            family;
 380         int                     (*callback)(struct sk_buff *skb, u8 protocol,
 381                                             int err);
 382 };
 383 
 384 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
 385 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
 386 
 387 void xfrm_flush_gc(void);
 388 void xfrm_state_delete_tunnel(struct xfrm_state *x);
 389 
 390 struct xfrm_type {
 391         char                    *description;
 392         struct module           *owner;
 393         u8                      proto;
 394         u8                      flags;
 395 #define XFRM_TYPE_NON_FRAGMENT  1
 396 #define XFRM_TYPE_REPLAY_PROT   2
 397 #define XFRM_TYPE_LOCAL_COADDR  4
 398 #define XFRM_TYPE_REMOTE_COADDR 8
 399 
 400         int                     (*init_state)(struct xfrm_state *x);
 401         void                    (*destructor)(struct xfrm_state *);
 402         int                     (*input)(struct xfrm_state *, struct sk_buff *skb);
 403         int                     (*output)(struct xfrm_state *, struct sk_buff *pskb);
 404         int                     (*reject)(struct xfrm_state *, struct sk_buff *,
 405                                           const struct flowi *);
 406         int                     (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
 407 };
 408 
 409 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
 410 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
 411 
 412 struct xfrm_type_offload {
 413         char            *description;
 414         struct module   *owner;
 415         u8              proto;
 416         void            (*encap)(struct xfrm_state *, struct sk_buff *pskb);
 417         int             (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
 418         int             (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
 419 };
 420 
 421 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
 422 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
 423 
 424 static inline int xfrm_af2proto(unsigned int family)
 425 {
 426         switch(family) {
 427         case AF_INET:
 428                 return IPPROTO_IPIP;
 429         case AF_INET6:
 430                 return IPPROTO_IPV6;
 431         default:
 432                 return 0;
 433         }
 434 }
 435 
 436 static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
 437 {
 438         if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
 439             (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
 440                 return &x->inner_mode;
 441         else
 442                 return &x->inner_mode_iaf;
 443 }
 444 
 445 struct xfrm_tmpl {
 446 /* id in template is interpreted as:
 447  * daddr - destination of tunnel, may be zero for transport mode.
 448  * spi   - zero to acquire spi. Not zero if spi is static, then
 449  *         daddr must be fixed too.
 450  * proto - AH/ESP/IPCOMP
 451  */
 452         struct xfrm_id          id;
 453 
 454 /* Source address of tunnel. Ignored, if it is not a tunnel. */
 455         xfrm_address_t          saddr;
 456 
 457         unsigned short          encap_family;
 458 
 459         u32                     reqid;
 460 
 461 /* Mode: transport, tunnel etc. */
 462         u8                      mode;
 463 
 464 /* Sharing mode: unique, this session only, this user only etc. */
 465         u8                      share;
 466 
 467 /* May skip this transfomration if no SA is found */
 468         u8                      optional;
 469 
 470 /* Skip aalgos/ealgos/calgos checks. */
 471         u8                      allalgs;
 472 
 473 /* Bit mask of algos allowed for acquisition */
 474         u32                     aalgos;
 475         u32                     ealgos;
 476         u32                     calgos;
 477 };
 478 
 479 #define XFRM_MAX_DEPTH          6
 480 #define XFRM_MAX_OFFLOAD_DEPTH  1
 481 
 482 struct xfrm_policy_walk_entry {
 483         struct list_head        all;
 484         u8                      dead;
 485 };
 486 
 487 struct xfrm_policy_walk {
 488         struct xfrm_policy_walk_entry walk;
 489         u8 type;
 490         u32 seq;
 491 };
 492 
 493 struct xfrm_policy_queue {
 494         struct sk_buff_head     hold_queue;
 495         struct timer_list       hold_timer;
 496         unsigned long           timeout;
 497 };
 498 
 499 struct xfrm_policy {
 500         possible_net_t          xp_net;
 501         struct hlist_node       bydst;
 502         struct hlist_node       byidx;
 503 
 504         /* This lock only affects elements except for entry. */
 505         rwlock_t                lock;
 506         refcount_t              refcnt;
 507         u32                     pos;
 508         struct timer_list       timer;
 509 
 510         atomic_t                genid;
 511         u32                     priority;
 512         u32                     index;
 513         u32                     if_id;
 514         struct xfrm_mark        mark;
 515         struct xfrm_selector    selector;
 516         struct xfrm_lifetime_cfg lft;
 517         struct xfrm_lifetime_cur curlft;
 518         struct xfrm_policy_walk_entry walk;
 519         struct xfrm_policy_queue polq;
 520         bool                    bydst_reinsert;
 521         u8                      type;
 522         u8                      action;
 523         u8                      flags;
 524         u8                      xfrm_nr;
 525         u16                     family;
 526         struct xfrm_sec_ctx     *security;
 527         struct xfrm_tmpl        xfrm_vec[XFRM_MAX_DEPTH];
 528         struct hlist_node       bydst_inexact_list;
 529         struct rcu_head         rcu;
 530 };
 531 
 532 static inline struct net *xp_net(const struct xfrm_policy *xp)
 533 {
 534         return read_pnet(&xp->xp_net);
 535 }
 536 
 537 struct xfrm_kmaddress {
 538         xfrm_address_t          local;
 539         xfrm_address_t          remote;
 540         u32                     reserved;
 541         u16                     family;
 542 };
 543 
 544 struct xfrm_migrate {
 545         xfrm_address_t          old_daddr;
 546         xfrm_address_t          old_saddr;
 547         xfrm_address_t          new_daddr;
 548         xfrm_address_t          new_saddr;
 549         u8                      proto;
 550         u8                      mode;
 551         u16                     reserved;
 552         u32                     reqid;
 553         u16                     old_family;
 554         u16                     new_family;
 555 };
 556 
 557 #define XFRM_KM_TIMEOUT                30
 558 /* what happened */
 559 #define XFRM_REPLAY_UPDATE      XFRM_AE_CR
 560 #define XFRM_REPLAY_TIMEOUT     XFRM_AE_CE
 561 
 562 /* default aevent timeout in units of 100ms */
 563 #define XFRM_AE_ETIME                   10
 564 /* Async Event timer multiplier */
 565 #define XFRM_AE_ETH_M                   10
 566 /* default seq threshold size */
 567 #define XFRM_AE_SEQT_SIZE               2
 568 
 569 struct xfrm_mgr {
 570         struct list_head        list;
 571         int                     (*notify)(struct xfrm_state *x, const struct km_event *c);
 572         int                     (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
 573         struct xfrm_policy      *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
 574         int                     (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
 575         int                     (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
 576         int                     (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
 577         int                     (*migrate)(const struct xfrm_selector *sel,
 578                                            u8 dir, u8 type,
 579                                            const struct xfrm_migrate *m,
 580                                            int num_bundles,
 581                                            const struct xfrm_kmaddress *k,
 582                                            const struct xfrm_encap_tmpl *encap);
 583         bool                    (*is_alive)(const struct km_event *c);
 584 };
 585 
 586 int xfrm_register_km(struct xfrm_mgr *km);
 587 int xfrm_unregister_km(struct xfrm_mgr *km);
 588 
 589 struct xfrm_tunnel_skb_cb {
 590         union {
 591                 struct inet_skb_parm h4;
 592                 struct inet6_skb_parm h6;
 593         } header;
 594 
 595         union {
 596                 struct ip_tunnel *ip4;
 597                 struct ip6_tnl *ip6;
 598         } tunnel;
 599 };
 600 
 601 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
 602 
 603 /*
 604  * This structure is used for the duration where packets are being
 605  * transformed by IPsec.  As soon as the packet leaves IPsec the
 606  * area beyond the generic IP part may be overwritten.
 607  */
 608 struct xfrm_skb_cb {
 609         struct xfrm_tunnel_skb_cb header;
 610 
 611         /* Sequence number for replay protection. */
 612         union {
 613                 struct {
 614                         __u32 low;
 615                         __u32 hi;
 616                 } output;
 617                 struct {
 618                         __be32 low;
 619                         __be32 hi;
 620                 } input;
 621         } seq;
 622 };
 623 
 624 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
 625 
 626 /*
 627  * This structure is used by the afinfo prepare_input/prepare_output functions
 628  * to transmit header information to the mode input/output functions.
 629  */
 630 struct xfrm_mode_skb_cb {
 631         struct xfrm_tunnel_skb_cb header;
 632 
 633         /* Copied from header for IPv4, always set to zero and DF for IPv6. */
 634         __be16 id;
 635         __be16 frag_off;
 636 
 637         /* IP header length (excluding options or extension headers). */
 638         u8 ihl;
 639 
 640         /* TOS for IPv4, class for IPv6. */
 641         u8 tos;
 642 
 643         /* TTL for IPv4, hop limitfor IPv6. */
 644         u8 ttl;
 645 
 646         /* Protocol for IPv4, NH for IPv6. */
 647         u8 protocol;
 648 
 649         /* Option length for IPv4, zero for IPv6. */
 650         u8 optlen;
 651 
 652         /* Used by IPv6 only, zero for IPv4. */
 653         u8 flow_lbl[3];
 654 };
 655 
 656 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
 657 
 658 /*
 659  * This structure is used by the input processing to locate the SPI and
 660  * related information.
 661  */
 662 struct xfrm_spi_skb_cb {
 663         struct xfrm_tunnel_skb_cb header;
 664 
 665         unsigned int daddroff;
 666         unsigned int family;
 667         __be32 seq;
 668 };
 669 
 670 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
 671 
 672 #ifdef CONFIG_AUDITSYSCALL
 673 static inline struct audit_buffer *xfrm_audit_start(const char *op)
 674 {
 675         struct audit_buffer *audit_buf = NULL;
 676 
 677         if (audit_enabled == AUDIT_OFF)
 678                 return NULL;
 679         audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
 680                                     AUDIT_MAC_IPSEC_EVENT);
 681         if (audit_buf == NULL)
 682                 return NULL;
 683         audit_log_format(audit_buf, "op=%s", op);
 684         return audit_buf;
 685 }
 686 
 687 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
 688                                              struct audit_buffer *audit_buf)
 689 {
 690         const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
 691                                             audit_get_loginuid(current) :
 692                                             INVALID_UID);
 693         const unsigned int ses = task_valid ? audit_get_sessionid(current) :
 694                 AUDIT_SID_UNSET;
 695 
 696         audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
 697         audit_log_task_context(audit_buf);
 698 }
 699 
 700 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
 701 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 702                               bool task_valid);
 703 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
 704 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
 705 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 706                                       struct sk_buff *skb);
 707 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
 708                              __be32 net_seq);
 709 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
 710 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
 711                                __be32 net_seq);
 712 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
 713                               u8 proto);
 714 #else
 715 
 716 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 717                                          bool task_valid)
 718 {
 719 }
 720 
 721 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
 722                                             bool task_valid)
 723 {
 724 }
 725 
 726 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
 727                                         bool task_valid)
 728 {
 729 }
 730 
 731 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
 732                                            bool task_valid)
 733 {
 734 }
 735 
 736 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
 737                                              struct sk_buff *skb)
 738 {
 739 }
 740 
 741 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
 742                                            struct sk_buff *skb, __be32 net_seq)
 743 {
 744 }
 745 
 746 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
 747                                       u16 family)
 748 {
 749 }
 750 
 751 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
 752                                       __be32 net_spi, __be32 net_seq)
 753 {
 754 }
 755 
 756 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
 757                                      struct sk_buff *skb, u8 proto)
 758 {
 759 }
 760 #endif /* CONFIG_AUDITSYSCALL */
 761 
 762 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
 763 {
 764         if (likely(policy != NULL))
 765                 refcount_inc(&policy->refcnt);
 766 }
 767 
 768 void xfrm_policy_destroy(struct xfrm_policy *policy);
 769 
 770 static inline void xfrm_pol_put(struct xfrm_policy *policy)
 771 {
 772         if (refcount_dec_and_test(&policy->refcnt))
 773                 xfrm_policy_destroy(policy);
 774 }
 775 
 776 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
 777 {
 778         int i;
 779         for (i = npols - 1; i >= 0; --i)
 780                 xfrm_pol_put(pols[i]);
 781 }
 782 
 783 void __xfrm_state_destroy(struct xfrm_state *, bool);
 784 
 785 static inline void __xfrm_state_put(struct xfrm_state *x)
 786 {
 787         refcount_dec(&x->refcnt);
 788 }
 789 
 790 static inline void xfrm_state_put(struct xfrm_state *x)
 791 {
 792         if (refcount_dec_and_test(&x->refcnt))
 793                 __xfrm_state_destroy(x, false);
 794 }
 795 
 796 static inline void xfrm_state_put_sync(struct xfrm_state *x)
 797 {
 798         if (refcount_dec_and_test(&x->refcnt))
 799                 __xfrm_state_destroy(x, true);
 800 }
 801 
 802 static inline void xfrm_state_hold(struct xfrm_state *x)
 803 {
 804         refcount_inc(&x->refcnt);
 805 }
 806 
 807 static inline bool addr_match(const void *token1, const void *token2,
 808                               unsigned int prefixlen)
 809 {
 810         const __be32 *a1 = token1;
 811         const __be32 *a2 = token2;
 812         unsigned int pdw;
 813         unsigned int pbi;
 814 
 815         pdw = prefixlen >> 5;     /* num of whole u32 in prefix */
 816         pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
 817 
 818         if (pdw)
 819                 if (memcmp(a1, a2, pdw << 2))
 820                         return false;
 821 
 822         if (pbi) {
 823                 __be32 mask;
 824 
 825                 mask = htonl((0xffffffff) << (32 - pbi));
 826 
 827                 if ((a1[pdw] ^ a2[pdw]) & mask)
 828                         return false;
 829         }
 830 
 831         return true;
 832 }
 833 
 834 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
 835 {
 836         /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
 837         if (sizeof(long) == 4 && prefixlen == 0)
 838                 return true;
 839         return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
 840 }
 841 
 842 static __inline__
 843 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
 844 {
 845         __be16 port;
 846         switch(fl->flowi_proto) {
 847         case IPPROTO_TCP:
 848         case IPPROTO_UDP:
 849         case IPPROTO_UDPLITE:
 850         case IPPROTO_SCTP:
 851                 port = uli->ports.sport;
 852                 break;
 853         case IPPROTO_ICMP:
 854         case IPPROTO_ICMPV6:
 855                 port = htons(uli->icmpt.type);
 856                 break;
 857         case IPPROTO_MH:
 858                 port = htons(uli->mht.type);
 859                 break;
 860         case IPPROTO_GRE:
 861                 port = htons(ntohl(uli->gre_key) >> 16);
 862                 break;
 863         default:
 864                 port = 0;       /*XXX*/
 865         }
 866         return port;
 867 }
 868 
 869 static __inline__
 870 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
 871 {
 872         __be16 port;
 873         switch(fl->flowi_proto) {
 874         case IPPROTO_TCP:
 875         case IPPROTO_UDP:
 876         case IPPROTO_UDPLITE:
 877         case IPPROTO_SCTP:
 878                 port = uli->ports.dport;
 879                 break;
 880         case IPPROTO_ICMP:
 881         case IPPROTO_ICMPV6:
 882                 port = htons(uli->icmpt.code);
 883                 break;
 884         case IPPROTO_GRE:
 885                 port = htons(ntohl(uli->gre_key) & 0xffff);
 886                 break;
 887         default:
 888                 port = 0;       /*XXX*/
 889         }
 890         return port;
 891 }
 892 
 893 bool xfrm_selector_match(const struct xfrm_selector *sel,
 894                          const struct flowi *fl, unsigned short family);
 895 
 896 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 897 /*      If neither has a context --> match
 898  *      Otherwise, both must have a context and the sids, doi, alg must match
 899  */
 900 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 901 {
 902         return ((!s1 && !s2) ||
 903                 (s1 && s2 &&
 904                  (s1->ctx_sid == s2->ctx_sid) &&
 905                  (s1->ctx_doi == s2->ctx_doi) &&
 906                  (s1->ctx_alg == s2->ctx_alg)));
 907 }
 908 #else
 909 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
 910 {
 911         return true;
 912 }
 913 #endif
 914 
 915 /* A struct encoding bundle of transformations to apply to some set of flow.
 916  *
 917  * xdst->child points to the next element of bundle.
 918  * dst->xfrm  points to an instanse of transformer.
 919  *
 920  * Due to unfortunate limitations of current routing cache, which we
 921  * have no time to fix, it mirrors struct rtable and bound to the same
 922  * routing key, including saddr,daddr. However, we can have many of
 923  * bundles differing by session id. All the bundles grow from a parent
 924  * policy rule.
 925  */
 926 struct xfrm_dst {
 927         union {
 928                 struct dst_entry        dst;
 929                 struct rtable           rt;
 930                 struct rt6_info         rt6;
 931         } u;
 932         struct dst_entry *route;
 933         struct dst_entry *child;
 934         struct dst_entry *path;
 935         struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
 936         int num_pols, num_xfrms;
 937         u32 xfrm_genid;
 938         u32 policy_genid;
 939         u32 route_mtu_cached;
 940         u32 child_mtu_cached;
 941         u32 route_cookie;
 942         u32 path_cookie;
 943 };
 944 
 945 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
 946 {
 947 #ifdef CONFIG_XFRM
 948         if (dst->xfrm) {
 949                 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
 950 
 951                 return xdst->path;
 952         }
 953 #endif
 954         return (struct dst_entry *) dst;
 955 }
 956 
 957 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
 958 {
 959 #ifdef CONFIG_XFRM
 960         if (dst->xfrm) {
 961                 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
 962                 return xdst->child;
 963         }
 964 #endif
 965         return NULL;
 966 }
 967 
 968 #ifdef CONFIG_XFRM
 969 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
 970 {
 971         xdst->child = child;
 972 }
 973 
 974 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
 975 {
 976         xfrm_pols_put(xdst->pols, xdst->num_pols);
 977         dst_release(xdst->route);
 978         if (likely(xdst->u.dst.xfrm))
 979                 xfrm_state_put(xdst->u.dst.xfrm);
 980 }
 981 #endif
 982 
 983 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
 984 
 985 struct xfrm_if_parms {
 986         int link;               /* ifindex of underlying L2 interface */
 987         u32 if_id;              /* interface identifyer */
 988 };
 989 
 990 struct xfrm_if {
 991         struct xfrm_if __rcu *next;     /* next interface in list */
 992         struct net_device *dev;         /* virtual device associated with interface */
 993         struct net *net;                /* netns for packet i/o */
 994         struct xfrm_if_parms p;         /* interface parms */
 995 
 996         struct gro_cells gro_cells;
 997 };
 998 
 999 struct xfrm_offload {
1000         /* Output sequence number for replay protection on offloading. */
1001         struct {
1002                 __u32 low;
1003                 __u32 hi;
1004         } seq;
1005 
1006         __u32                   flags;
1007 #define SA_DELETE_REQ           1
1008 #define CRYPTO_DONE             2
1009 #define CRYPTO_NEXT_DONE        4
1010 #define CRYPTO_FALLBACK         8
1011 #define XFRM_GSO_SEGMENT        16
1012 #define XFRM_GRO                32
1013 #define XFRM_ESP_NO_TRAILER     64
1014 #define XFRM_DEV_RESUME         128
1015 
1016         __u32                   status;
1017 #define CRYPTO_SUCCESS                          1
1018 #define CRYPTO_GENERIC_ERROR                    2
1019 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED         4
1020 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED        8
1021 #define CRYPTO_TUNNEL_AH_AUTH_FAILED            16
1022 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED           32
1023 #define CRYPTO_INVALID_PACKET_SYNTAX            64
1024 #define CRYPTO_INVALID_PROTOCOL                 128
1025 
1026         __u8                    proto;
1027 };
1028 
1029 struct sec_path {
1030         int                     len;
1031         int                     olen;
1032 
1033         struct xfrm_state       *xvec[XFRM_MAX_DEPTH];
1034         struct xfrm_offload     ovec[XFRM_MAX_OFFLOAD_DEPTH];
1035 };
1036 
1037 struct sec_path *secpath_set(struct sk_buff *skb);
1038 
1039 static inline void
1040 secpath_reset(struct sk_buff *skb)
1041 {
1042 #ifdef CONFIG_XFRM
1043         skb_ext_del(skb, SKB_EXT_SEC_PATH);
1044 #endif
1045 }
1046 
1047 static inline int
1048 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1049 {
1050         switch (family) {
1051         case AF_INET:
1052                 return addr->a4 == 0;
1053         case AF_INET6:
1054                 return ipv6_addr_any(&addr->in6);
1055         }
1056         return 0;
1057 }
1058 
1059 static inline int
1060 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1061 {
1062         return  (tmpl->saddr.a4 &&
1063                  tmpl->saddr.a4 != x->props.saddr.a4);
1064 }
1065 
1066 static inline int
1067 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1068 {
1069         return  (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1070                  !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1071 }
1072 
1073 static inline int
1074 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1075 {
1076         switch (family) {
1077         case AF_INET:
1078                 return __xfrm4_state_addr_cmp(tmpl, x);
1079         case AF_INET6:
1080                 return __xfrm6_state_addr_cmp(tmpl, x);
1081         }
1082         return !0;
1083 }
1084 
1085 #ifdef CONFIG_XFRM
1086 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1087                         unsigned short family);
1088 
1089 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1090                                        struct sk_buff *skb,
1091                                        unsigned int family, int reverse)
1092 {
1093         struct net *net = dev_net(skb->dev);
1094         int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1095 
1096         if (sk && sk->sk_policy[XFRM_POLICY_IN])
1097                 return __xfrm_policy_check(sk, ndir, skb, family);
1098 
1099         return  (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) ||
1100                 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1101                 __xfrm_policy_check(sk, ndir, skb, family);
1102 }
1103 
1104 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1105 {
1106         return __xfrm_policy_check2(sk, dir, skb, family, 0);
1107 }
1108 
1109 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1110 {
1111         return xfrm_policy_check(sk, dir, skb, AF_INET);
1112 }
1113 
1114 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1115 {
1116         return xfrm_policy_check(sk, dir, skb, AF_INET6);
1117 }
1118 
1119 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1120                                              struct sk_buff *skb)
1121 {
1122         return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1123 }
1124 
1125 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1126                                              struct sk_buff *skb)
1127 {
1128         return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1129 }
1130 
1131 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1132                           unsigned int family, int reverse);
1133 
1134 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1135                                       unsigned int family)
1136 {
1137         return __xfrm_decode_session(skb, fl, family, 0);
1138 }
1139 
1140 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1141                                               struct flowi *fl,
1142                                               unsigned int family)
1143 {
1144         return __xfrm_decode_session(skb, fl, family, 1);
1145 }
1146 
1147 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1148 
1149 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1150 {
1151         struct net *net = dev_net(skb->dev);
1152 
1153         return  !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1154                 (skb_dst(skb)->flags & DST_NOXFRM) ||
1155                 __xfrm_route_forward(skb, family);
1156 }
1157 
1158 static inline int xfrm4_route_forward(struct sk_buff *skb)
1159 {
1160         return xfrm_route_forward(skb, AF_INET);
1161 }
1162 
1163 static inline int xfrm6_route_forward(struct sk_buff *skb)
1164 {
1165         return xfrm_route_forward(skb, AF_INET6);
1166 }
1167 
1168 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1169 
1170 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1171 {
1172         sk->sk_policy[0] = NULL;
1173         sk->sk_policy[1] = NULL;
1174         if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1175                 return __xfrm_sk_clone_policy(sk, osk);
1176         return 0;
1177 }
1178 
1179 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1180 
1181 static inline void xfrm_sk_free_policy(struct sock *sk)
1182 {
1183         struct xfrm_policy *pol;
1184 
1185         pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1186         if (unlikely(pol != NULL)) {
1187                 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1188                 sk->sk_policy[0] = NULL;
1189         }
1190         pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1191         if (unlikely(pol != NULL)) {
1192                 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1193                 sk->sk_policy[1] = NULL;
1194         }
1195 }
1196 
1197 #else
1198 
1199 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1200 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1201 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1202 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1203 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1204 {
1205         return 1;
1206 }
1207 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1208 {
1209         return 1;
1210 }
1211 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1212 {
1213         return 1;
1214 }
1215 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1216                                               struct flowi *fl,
1217                                               unsigned int family)
1218 {
1219         return -ENOSYS;
1220 }
1221 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1222                                              struct sk_buff *skb)
1223 {
1224         return 1;
1225 }
1226 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1227                                              struct sk_buff *skb)
1228 {
1229         return 1;
1230 }
1231 #endif
1232 
1233 static __inline__
1234 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1235 {
1236         switch (family){
1237         case AF_INET:
1238                 return (xfrm_address_t *)&fl->u.ip4.daddr;
1239         case AF_INET6:
1240                 return (xfrm_address_t *)&fl->u.ip6.daddr;
1241         }
1242         return NULL;
1243 }
1244 
1245 static __inline__
1246 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1247 {
1248         switch (family){
1249         case AF_INET:
1250                 return (xfrm_address_t *)&fl->u.ip4.saddr;
1251         case AF_INET6:
1252                 return (xfrm_address_t *)&fl->u.ip6.saddr;
1253         }
1254         return NULL;
1255 }
1256 
1257 static __inline__
1258 void xfrm_flowi_addr_get(const struct flowi *fl,
1259                          xfrm_address_t *saddr, xfrm_address_t *daddr,
1260                          unsigned short family)
1261 {
1262         switch(family) {
1263         case AF_INET:
1264                 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1265                 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1266                 break;
1267         case AF_INET6:
1268                 saddr->in6 = fl->u.ip6.saddr;
1269                 daddr->in6 = fl->u.ip6.daddr;
1270                 break;
1271         }
1272 }
1273 
1274 static __inline__ int
1275 __xfrm4_state_addr_check(const struct xfrm_state *x,
1276                          const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1277 {
1278         if (daddr->a4 == x->id.daddr.a4 &&
1279             (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1280                 return 1;
1281         return 0;
1282 }
1283 
1284 static __inline__ int
1285 __xfrm6_state_addr_check(const struct xfrm_state *x,
1286                          const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1287 {
1288         if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1289             (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1290              ipv6_addr_any((struct in6_addr *)saddr) ||
1291              ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1292                 return 1;
1293         return 0;
1294 }
1295 
1296 static __inline__ int
1297 xfrm_state_addr_check(const struct xfrm_state *x,
1298                       const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1299                       unsigned short family)
1300 {
1301         switch (family) {
1302         case AF_INET:
1303                 return __xfrm4_state_addr_check(x, daddr, saddr);
1304         case AF_INET6:
1305                 return __xfrm6_state_addr_check(x, daddr, saddr);
1306         }
1307         return 0;
1308 }
1309 
1310 static __inline__ int
1311 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1312                            unsigned short family)
1313 {
1314         switch (family) {
1315         case AF_INET:
1316                 return __xfrm4_state_addr_check(x,
1317                                                 (const xfrm_address_t *)&fl->u.ip4.daddr,
1318                                                 (const xfrm_address_t *)&fl->u.ip4.saddr);
1319         case AF_INET6:
1320                 return __xfrm6_state_addr_check(x,
1321                                                 (const xfrm_address_t *)&fl->u.ip6.daddr,
1322                                                 (const xfrm_address_t *)&fl->u.ip6.saddr);
1323         }
1324         return 0;
1325 }
1326 
1327 static inline int xfrm_state_kern(const struct xfrm_state *x)
1328 {
1329         return atomic_read(&x->tunnel_users);
1330 }
1331 
1332 static inline bool xfrm_id_proto_valid(u8 proto)
1333 {
1334         switch (proto) {
1335         case IPPROTO_AH:
1336         case IPPROTO_ESP:
1337         case IPPROTO_COMP:
1338 #if IS_ENABLED(CONFIG_IPV6)
1339         case IPPROTO_ROUTING:
1340         case IPPROTO_DSTOPTS:
1341 #endif
1342                 return true;
1343         default:
1344                 return false;
1345         }
1346 }
1347 
1348 /* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */
1349 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1350 {
1351         return (!userproto || proto == userproto ||
1352                 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1353                                                   proto == IPPROTO_ESP ||
1354                                                   proto == IPPROTO_COMP)));
1355 }
1356 
1357 /*
1358  * xfrm algorithm information
1359  */
1360 struct xfrm_algo_aead_info {
1361         char *geniv;
1362         u16 icv_truncbits;
1363 };
1364 
1365 struct xfrm_algo_auth_info {
1366         u16 icv_truncbits;
1367         u16 icv_fullbits;
1368 };
1369 
1370 struct xfrm_algo_encr_info {
1371         char *geniv;
1372         u16 blockbits;
1373         u16 defkeybits;
1374 };
1375 
1376 struct xfrm_algo_comp_info {
1377         u16 threshold;
1378 };
1379 
1380 struct xfrm_algo_desc {
1381         char *name;
1382         char *compat;
1383         u8 available:1;
1384         u8 pfkey_supported:1;
1385         union {
1386                 struct xfrm_algo_aead_info aead;
1387                 struct xfrm_algo_auth_info auth;
1388                 struct xfrm_algo_encr_info encr;
1389                 struct xfrm_algo_comp_info comp;
1390         } uinfo;
1391         struct sadb_alg desc;
1392 };
1393 
1394 /* XFRM protocol handlers.  */
1395 struct xfrm4_protocol {
1396         int (*handler)(struct sk_buff *skb);
1397         int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1398                              int encap_type);
1399         int (*cb_handler)(struct sk_buff *skb, int err);
1400         int (*err_handler)(struct sk_buff *skb, u32 info);
1401 
1402         struct xfrm4_protocol __rcu *next;
1403         int priority;
1404 };
1405 
1406 struct xfrm6_protocol {
1407         int (*handler)(struct sk_buff *skb);
1408         int (*cb_handler)(struct sk_buff *skb, int err);
1409         int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1410                            u8 type, u8 code, int offset, __be32 info);
1411 
1412         struct xfrm6_protocol __rcu *next;
1413         int priority;
1414 };
1415 
1416 /* XFRM tunnel handlers.  */
1417 struct xfrm_tunnel {
1418         int (*handler)(struct sk_buff *skb);
1419         int (*err_handler)(struct sk_buff *skb, u32 info);
1420 
1421         struct xfrm_tunnel __rcu *next;
1422         int priority;
1423 };
1424 
1425 struct xfrm6_tunnel {
1426         int (*handler)(struct sk_buff *skb);
1427         int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1428                            u8 type, u8 code, int offset, __be32 info);
1429         struct xfrm6_tunnel __rcu *next;
1430         int priority;
1431 };
1432 
1433 void xfrm_init(void);
1434 void xfrm4_init(void);
1435 int xfrm_state_init(struct net *net);
1436 void xfrm_state_fini(struct net *net);
1437 void xfrm4_state_init(void);
1438 void xfrm4_protocol_init(void);
1439 #ifdef CONFIG_XFRM
1440 int xfrm6_init(void);
1441 void xfrm6_fini(void);
1442 int xfrm6_state_init(void);
1443 void xfrm6_state_fini(void);
1444 int xfrm6_protocol_init(void);
1445 void xfrm6_protocol_fini(void);
1446 #else
1447 static inline int xfrm6_init(void)
1448 {
1449         return 0;
1450 }
1451 static inline void xfrm6_fini(void)
1452 {
1453         ;
1454 }
1455 #endif
1456 
1457 #ifdef CONFIG_XFRM_STATISTICS
1458 int xfrm_proc_init(struct net *net);
1459 void xfrm_proc_fini(struct net *net);
1460 #endif
1461 
1462 int xfrm_sysctl_init(struct net *net);
1463 #ifdef CONFIG_SYSCTL
1464 void xfrm_sysctl_fini(struct net *net);
1465 #else
1466 static inline void xfrm_sysctl_fini(struct net *net)
1467 {
1468 }
1469 #endif
1470 
1471 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1472                           struct xfrm_address_filter *filter);
1473 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1474                     int (*func)(struct xfrm_state *, int, void*), void *);
1475 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1476 struct xfrm_state *xfrm_state_alloc(struct net *net);
1477 void xfrm_state_free(struct xfrm_state *x);
1478 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1479                                    const xfrm_address_t *saddr,
1480                                    const struct flowi *fl,
1481                                    struct xfrm_tmpl *tmpl,
1482                                    struct xfrm_policy *pol, int *err,
1483                                    unsigned short family, u32 if_id);
1484 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1485                                        xfrm_address_t *daddr,
1486                                        xfrm_address_t *saddr,
1487                                        unsigned short family,
1488                                        u8 mode, u8 proto, u32 reqid);
1489 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1490                                               unsigned short family);
1491 int xfrm_state_check_expire(struct xfrm_state *x);
1492 void xfrm_state_insert(struct xfrm_state *x);
1493 int xfrm_state_add(struct xfrm_state *x);
1494 int xfrm_state_update(struct xfrm_state *x);
1495 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1496                                      const xfrm_address_t *daddr, __be32 spi,
1497                                      u8 proto, unsigned short family);
1498 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1499                                             const xfrm_address_t *daddr,
1500                                             const xfrm_address_t *saddr,
1501                                             u8 proto,
1502                                             unsigned short family);
1503 #ifdef CONFIG_XFRM_SUB_POLICY
1504 void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1505                     unsigned short family);
1506 void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1507                      unsigned short family);
1508 #else
1509 static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s,
1510                                   int n, unsigned short family)
1511 {
1512 }
1513 
1514 static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s,
1515                                    int n, unsigned short family)
1516 {
1517 }
1518 #endif
1519 
1520 struct xfrmk_sadinfo {
1521         u32 sadhcnt; /* current hash bkts */
1522         u32 sadhmcnt; /* max allowed hash bkts */
1523         u32 sadcnt; /* current running count */
1524 };
1525 
1526 struct xfrmk_spdinfo {
1527         u32 incnt;
1528         u32 outcnt;
1529         u32 fwdcnt;
1530         u32 inscnt;
1531         u32 outscnt;
1532         u32 fwdscnt;
1533         u32 spdhcnt;
1534         u32 spdhmcnt;
1535 };
1536 
1537 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1538 int xfrm_state_delete(struct xfrm_state *x);
1539 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
1540 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1541 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1542 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1543 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1544 int xfrm_init_replay(struct xfrm_state *x);
1545 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu);
1546 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1547 int xfrm_init_state(struct xfrm_state *x);
1548 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1549 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1550 int xfrm_trans_queue(struct sk_buff *skb,
1551                      int (*finish)(struct net *, struct sock *,
1552                                    struct sk_buff *));
1553 int xfrm_output_resume(struct sk_buff *skb, int err);
1554 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1555 
1556 #if IS_ENABLED(CONFIG_NET_PKTGEN)
1557 int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb);
1558 #endif
1559 
1560 void xfrm_local_error(struct sk_buff *skb, int mtu);
1561 int xfrm4_extract_header(struct sk_buff *skb);
1562 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1563 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1564                     int encap_type);
1565 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1566 int xfrm4_rcv(struct sk_buff *skb);
1567 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1568 
1569 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1570 {
1571         XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1572         XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1573         XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1574         return xfrm_input(skb, nexthdr, spi, 0);
1575 }
1576 
1577 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1578 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1579 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1580 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1581 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1582 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1583 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1584 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1585 int xfrm6_extract_header(struct sk_buff *skb);
1586 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1587 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1588                   struct ip6_tnl *t);
1589 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1590 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1591 int xfrm6_rcv(struct sk_buff *skb);
1592 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1593                      xfrm_address_t *saddr, u8 proto);
1594 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1595 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1596 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1597 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1598 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1599 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1600 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1601 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1602 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1603 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1604 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1605                           u8 **prevhdr);
1606 
1607 #ifdef CONFIG_XFRM
1608 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1609 int xfrm_user_policy(struct sock *sk, int optname,
1610                      u8 __user *optval, int optlen);
1611 #else
1612 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1613 {
1614         return -ENOPROTOOPT;
1615 }
1616 
1617 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1618 {
1619         /* should not happen */
1620         kfree_skb(skb);
1621         return 0;
1622 }
1623 #endif
1624 
1625 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1626                                     const xfrm_address_t *saddr,
1627                                     const xfrm_address_t *daddr,
1628                                     int family, u32 mark);
1629 
1630 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1631 
1632 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1633 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1634                      int (*func)(struct xfrm_policy *, int, int, void*),
1635                      void *);
1636 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1637 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1638 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u32 if_id,
1639                                           u8 type, int dir,
1640                                           struct xfrm_selector *sel,
1641                                           struct xfrm_sec_ctx *ctx, int delete,
1642                                           int *err);
1643 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u32 if_id, u8,
1644                                      int dir, u32 id, int delete, int *err);
1645 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1646 void xfrm_policy_hash_rebuild(struct net *net);
1647 u32 xfrm_get_acqseq(void);
1648 int verify_spi_info(u8 proto, u32 min, u32 max);
1649 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1650 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1651                                  u8 mode, u32 reqid, u32 if_id, u8 proto,
1652                                  const xfrm_address_t *daddr,
1653                                  const xfrm_address_t *saddr, int create,
1654                                  unsigned short family);
1655 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1656 
1657 #ifdef CONFIG_XFRM_MIGRATE
1658 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1659                const struct xfrm_migrate *m, int num_bundles,
1660                const struct xfrm_kmaddress *k,
1661                const struct xfrm_encap_tmpl *encap);
1662 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1663 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1664                                       struct xfrm_migrate *m,
1665                                       struct xfrm_encap_tmpl *encap);
1666 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1667                  struct xfrm_migrate *m, int num_bundles,
1668                  struct xfrm_kmaddress *k, struct net *net,
1669                  struct xfrm_encap_tmpl *encap);
1670 #endif
1671 
1672 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1673 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1674 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1675               xfrm_address_t *addr);
1676 
1677 void xfrm_input_init(void);
1678 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1679 
1680 void xfrm_probe_algs(void);
1681 int xfrm_count_pfkey_auth_supported(void);
1682 int xfrm_count_pfkey_enc_supported(void);
1683 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1684 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1685 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1686 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1687 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1688 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1689 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1690 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1691 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1692                                             int probe);
1693 
1694 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1695                                     const xfrm_address_t *b)
1696 {
1697         return ipv6_addr_equal((const struct in6_addr *)a,
1698                                (const struct in6_addr *)b);
1699 }
1700 
1701 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1702                                    const xfrm_address_t *b,
1703                                    sa_family_t family)
1704 {
1705         switch (family) {
1706         default:
1707         case AF_INET:
1708                 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1709         case AF_INET6:
1710                 return xfrm6_addr_equal(a, b);
1711         }
1712 }
1713 
1714 static inline int xfrm_policy_id2dir(u32 index)
1715 {
1716         return index & 7;
1717 }
1718 
1719 #ifdef CONFIG_XFRM
1720 static inline int xfrm_aevent_is_on(struct net *net)
1721 {
1722         struct sock *nlsk;
1723         int ret = 0;
1724 
1725         rcu_read_lock();
1726         nlsk = rcu_dereference(net->xfrm.nlsk);
1727         if (nlsk)
1728                 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1729         rcu_read_unlock();
1730         return ret;
1731 }
1732 
1733 static inline int xfrm_acquire_is_on(struct net *net)
1734 {
1735         struct sock *nlsk;
1736         int ret = 0;
1737 
1738         rcu_read_lock();
1739         nlsk = rcu_dereference(net->xfrm.nlsk);
1740         if (nlsk)
1741                 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1742         rcu_read_unlock();
1743 
1744         return ret;
1745 }
1746 #endif
1747 
1748 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1749 {
1750         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1751 }
1752 
1753 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1754 {
1755         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1756 }
1757 
1758 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1759 {
1760         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1761 }
1762 
1763 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1764 {
1765         return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1766 }
1767 
1768 #ifdef CONFIG_XFRM_MIGRATE
1769 static inline int xfrm_replay_clone(struct xfrm_state *x,
1770                                      struct xfrm_state *orig)
1771 {
1772         x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1773                                 GFP_KERNEL);
1774         if (!x->replay_esn)
1775                 return -ENOMEM;
1776 
1777         x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1778         x->replay_esn->replay_window = orig->replay_esn->replay_window;
1779 
1780         x->preplay_esn = kmemdup(x->replay_esn,
1781                                  xfrm_replay_state_esn_len(x->replay_esn),
1782                                  GFP_KERNEL);
1783         if (!x->preplay_esn) {
1784                 kfree(x->replay_esn);
1785                 return -ENOMEM;
1786         }
1787 
1788         return 0;
1789 }
1790 
1791 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1792 {
1793         return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1794 }
1795 
1796 
1797 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1798 {
1799         return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1800 }
1801 
1802 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1803 {
1804         return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1805 }
1806 
1807 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1808 {
1809         int i;
1810         for (i = 0; i < n; i++)
1811                 xfrm_state_put(*(states + i));
1812 }
1813 
1814 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1815 {
1816         int i;
1817         for (i = 0; i < n; i++)
1818                 xfrm_state_delete(*(states + i));
1819 }
1820 #endif
1821 
1822 #ifdef CONFIG_XFRM
1823 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1824 {
1825         struct sec_path *sp = skb_sec_path(skb);
1826 
1827         return sp->xvec[sp->len - 1];
1828 }
1829 #endif
1830 
1831 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1832 {
1833 #ifdef CONFIG_XFRM
1834         struct sec_path *sp = skb_sec_path(skb);
1835 
1836         if (!sp || !sp->olen || sp->len != sp->olen)
1837                 return NULL;
1838 
1839         return &sp->ovec[sp->olen - 1];
1840 #else
1841         return NULL;
1842 #endif
1843 }
1844 
1845 void __init xfrm_dev_init(void);
1846 
1847 #ifdef CONFIG_XFRM_OFFLOAD
1848 void xfrm_dev_resume(struct sk_buff *skb);
1849 void xfrm_dev_backlog(struct softnet_data *sd);
1850 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1851 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1852                        struct xfrm_user_offload *xuo);
1853 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1854 
1855 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1856 {
1857         struct xfrm_state_offload *xso = &x->xso;
1858 
1859         if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1860                 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1861 }
1862 
1863 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1864 {
1865         struct xfrm_state *x = dst->xfrm;
1866         struct xfrm_dst *xdst;
1867 
1868         if (!x || !x->type_offload)
1869                 return false;
1870 
1871         xdst = (struct xfrm_dst *) dst;
1872         if (!x->xso.offload_handle && !xdst->child->xfrm)
1873                 return true;
1874         if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1875             !xdst->child->xfrm)
1876                 return true;
1877 
1878         return false;
1879 }
1880 
1881 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1882 {
1883         struct xfrm_state_offload *xso = &x->xso;
1884 
1885         if (xso->dev)
1886                 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1887 }
1888 
1889 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1890 {
1891         struct xfrm_state_offload *xso = &x->xso;
1892         struct net_device *dev = xso->dev;
1893 
1894         if (dev && dev->xfrmdev_ops) {
1895                 if (dev->xfrmdev_ops->xdo_dev_state_free)
1896                         dev->xfrmdev_ops->xdo_dev_state_free(x);
1897                 xso->dev = NULL;
1898                 dev_put(dev);
1899         }
1900 }
1901 #else
1902 static inline void xfrm_dev_resume(struct sk_buff *skb)
1903 {
1904 }
1905 
1906 static inline void xfrm_dev_backlog(struct softnet_data *sd)
1907 {
1908 }
1909 
1910 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1911 {
1912         return skb;
1913 }
1914 
1915 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1916 {
1917         return 0;
1918 }
1919 
1920 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1921 {
1922 }
1923 
1924 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1925 {
1926 }
1927 
1928 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1929 {
1930         return false;
1931 }
1932 
1933 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1934 {
1935 }
1936 
1937 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1938 {
1939         return false;
1940 }
1941 #endif
1942 
1943 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1944 {
1945         if (attrs[XFRMA_MARK])
1946                 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1947         else
1948                 m->v = m->m = 0;
1949 
1950         return m->v & m->m;
1951 }
1952 
1953 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1954 {
1955         int ret = 0;
1956 
1957         if (m->m | m->v)
1958                 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1959         return ret;
1960 }
1961 
1962 static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x)
1963 {
1964         struct xfrm_mark *m = &x->props.smark;
1965 
1966         return (m->v & m->m) | (mark & ~m->m);
1967 }
1968 
1969 static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
1970 {
1971         int ret = 0;
1972 
1973         if (if_id)
1974                 ret = nla_put_u32(skb, XFRMA_IF_ID, if_id);
1975         return ret;
1976 }
1977 
1978 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1979                                     unsigned int family)
1980 {
1981         bool tunnel = false;
1982 
1983         switch(family) {
1984         case AF_INET:
1985                 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1986                         tunnel = true;
1987                 break;
1988         case AF_INET6:
1989                 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1990                         tunnel = true;
1991                 break;
1992         }
1993         if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL))
1994                 return -EINVAL;
1995 
1996         return 0;
1997 }
1998 #endif  /* _NET_XFRM_H */
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root/include/net/xfrm.h

INCLUDED FROM

DEFINITIONS
