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TOMOYO Linux Cross Reference
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 #else
 49 #define XFRM_INC_STATS(net, field)      ((void)(net))
 50 #endif
 51 
 52 
 53 /* Organization of SPD aka "XFRM rules"
 54    ------------------------------------
 55 
 56    Basic objects:
 57    - policy rule, struct xfrm_policy (=SPD entry)
 58    - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
 59    - instance of a transformer, struct xfrm_state (=SA)
 60    - template to clone xfrm_state, struct xfrm_tmpl
 61 
 62    SPD is plain linear list of xfrm_policy rules, ordered by priority.
 63    (To be compatible with existing pfkeyv2 implementations,
 64    many rules with priority of 0x7fffffff are allowed to exist and
 65    such rules are ordered in an unpredictable way, thanks to bsd folks.)
 66 
 67    Lookup is plain linear search until the first match with selector.
 68 
 69    If "action" is "block", then we prohibit the flow, otherwise:
 70    if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
 71    policy entry has list of up to XFRM_MAX_DEPTH transformations,
 72    described by templates xfrm_tmpl. Each template is resolved
 73    to a complete xfrm_state (see below) and we pack bundle of transformations
 74    to a dst_entry returned to requestor.
 75 
 76    dst -. xfrm  .-> xfrm_state #1
 77     |---. child .-> dst -. xfrm .-> xfrm_state #2
 78                      |---. child .-> dst -. xfrm .-> xfrm_state #3
 79                                       |---. child .-> NULL
 80 
 81    Bundles are cached at xrfm_policy struct (field ->bundles).
 82 
 83 
 84    Resolution of xrfm_tmpl
 85    -----------------------
 86    Template contains:
 87    1. ->mode            Mode: transport or tunnel
 88    2. ->id.proto        Protocol: AH/ESP/IPCOMP
 89    3. ->id.daddr        Remote tunnel endpoint, ignored for transport mode.
 90       Q: allow to resolve security gateway?
 91    4. ->id.spi          If not zero, static SPI.
 92    5. ->saddr           Local tunnel endpoint, ignored for transport mode.
 93    6. ->algos           List of allowed algos. Plain bitmask now.
 94       Q: ealgos, aalgos, calgos. What a mess...
 95    7. ->share           Sharing mode.
 96       Q: how to implement private sharing mode? To add struct sock* to
 97       flow id?
 98 
 99    Having this template we search through SAD searching for entries
100    with appropriate mode/proto/algo, permitted by selector.
101    If no appropriate entry found, it is requested from key manager.
102 
103    PROBLEMS:
104    Q: How to find all the bundles referring to a physical path for
105       PMTU discovery? Seems, dst should contain list of all parents...
106       and enter to infinite locking hierarchy disaster.
107       No! It is easier, we will not search for them, let them find us.
108       We add genid to each dst plus pointer to genid of raw IP route,
109       pmtu disc will update pmtu on raw IP route and increase its genid.
110       dst_check() will see this for top level and trigger resyncing
111       metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
112  */
113 
114 struct xfrm_state_walk {
115         struct list_head        all;
116         u8                      state;
117         u8                      dying;
118         u8                      proto;
119         u32                     seq;
120         struct xfrm_address_filter *filter;
121 };
122 
123 struct xfrm_state_offload {
124         struct net_device       *dev;
125         unsigned long           offload_handle;
126         unsigned int            num_exthdrs;
127         u8                      flags;
128 };
129 
130 /* Full description of state of transformer. */
131 struct xfrm_state {
132         possible_net_t          xs_net;
133         union {
134                 struct hlist_node       gclist;
135                 struct hlist_node       bydst;
136         };
137         struct hlist_node       bysrc;
138         struct hlist_node       byspi;
139 
140         atomic_t                refcnt;
141         spinlock_t              lock;
142 
143         struct xfrm_id          id;
144         struct xfrm_selector    sel;
145         struct xfrm_mark        mark;
146         u32                     tfcpad;
147 
148         u32                     genid;
149 
150         /* Key manager bits */
151         struct xfrm_state_walk  km;
152 
153         /* Parameters of this state. */
154         struct {
155                 u32             reqid;
156                 u8              mode;
157                 u8              replay_window;
158                 u8              aalgo, ealgo, calgo;
159                 u8              flags;
160                 u16             family;
161                 xfrm_address_t  saddr;
162                 int             header_len;
163                 int             trailer_len;
164                 u32             extra_flags;
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         const char              *geniv;
175 
176         /* Data for encapsulator */
177         struct xfrm_encap_tmpl  *encap;
178 
179         /* Data for care-of address */
180         xfrm_address_t  *coaddr;
181 
182         /* IPComp needs an IPIP tunnel for handling uncompressed packets */
183         struct xfrm_state       *tunnel;
184 
185         /* If a tunnel, number of users + 1 */
186         atomic_t                tunnel_users;
187 
188         /* State for replay detection */
189         struct xfrm_replay_state replay;
190         struct xfrm_replay_state_esn *replay_esn;
191 
192         /* Replay detection state at the time we sent the last notification */
193         struct xfrm_replay_state preplay;
194         struct xfrm_replay_state_esn *preplay_esn;
195 
196         /* The functions for replay detection. */
197         const struct xfrm_replay *repl;
198 
199         /* internal flag that only holds state for delayed aevent at the
200          * moment
201         */
202         u32                     xflags;
203 
204         /* Replay detection notification settings */
205         u32                     replay_maxage;
206         u32                     replay_maxdiff;
207 
208         /* Replay detection notification timer */
209         struct timer_list       rtimer;
210 
211         /* Statistics */
212         struct xfrm_stats       stats;
213 
214         struct xfrm_lifetime_cur curlft;
215         struct tasklet_hrtimer  mtimer;
216 
217         struct xfrm_state_offload xso;
218 
219         /* used to fix curlft->add_time when changing date */
220         long            saved_tmo;
221 
222         /* Last used time */
223         unsigned long           lastused;
224 
225         struct page_frag xfrag;
226 
227         /* Reference to data common to all the instances of this
228          * transformer. */
229         const struct xfrm_type  *type;
230         struct xfrm_mode        *inner_mode;
231         struct xfrm_mode        *inner_mode_iaf;
232         struct xfrm_mode        *outer_mode;
233 
234         const struct xfrm_type_offload  *type_offload;
235 
236         /* Security context */
237         struct xfrm_sec_ctx     *security;
238 
239         /* Private data of this transformer, format is opaque,
240          * interpreted by xfrm_type methods. */
241         void                    *data;
242 };
243 
244 static inline struct net *xs_net(struct xfrm_state *x)
245 {
246         return read_pnet(&x->xs_net);
247 }
248 
249 /* xflags - make enum if more show up */
250 #define XFRM_TIME_DEFER 1
251 #define XFRM_SOFT_EXPIRE 2
252 
253 enum {
254         XFRM_STATE_VOID,
255         XFRM_STATE_ACQ,
256         XFRM_STATE_VALID,
257         XFRM_STATE_ERROR,
258         XFRM_STATE_EXPIRED,
259         XFRM_STATE_DEAD
260 };
261 
262 /* callback structure passed from either netlink or pfkey */
263 struct km_event {
264         union {
265                 u32 hard;
266                 u32 proto;
267                 u32 byid;
268                 u32 aevent;
269                 u32 type;
270         } data;
271 
272         u32     seq;
273         u32     portid;
274         u32     event;
275         struct net *net;
276 };
277 
278 struct xfrm_replay {
279         void    (*advance)(struct xfrm_state *x, __be32 net_seq);
280         int     (*check)(struct xfrm_state *x,
281                          struct sk_buff *skb,
282                          __be32 net_seq);
283         int     (*recheck)(struct xfrm_state *x,
284                            struct sk_buff *skb,
285                            __be32 net_seq);
286         void    (*notify)(struct xfrm_state *x, int event);
287         int     (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
288 };
289 
290 struct net_device;
291 struct xfrm_type;
292 struct xfrm_dst;
293 struct xfrm_policy_afinfo {
294         struct dst_ops          *dst_ops;
295         struct dst_entry        *(*dst_lookup)(struct net *net,
296                                                int tos, int oif,
297                                                const xfrm_address_t *saddr,
298                                                const xfrm_address_t *daddr);
299         int                     (*get_saddr)(struct net *net, int oif,
300                                              xfrm_address_t *saddr,
301                                              xfrm_address_t *daddr);
302         void                    (*decode_session)(struct sk_buff *skb,
303                                                   struct flowi *fl,
304                                                   int reverse);
305         int                     (*get_tos)(const struct flowi *fl);
306         int                     (*init_path)(struct xfrm_dst *path,
307                                              struct dst_entry *dst,
308                                              int nfheader_len);
309         int                     (*fill_dst)(struct xfrm_dst *xdst,
310                                             struct net_device *dev,
311                                             const struct flowi *fl);
312         struct dst_entry        *(*blackhole_route)(struct net *net, struct dst_entry *orig);
313 };
314 
315 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
316 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
317 void km_policy_notify(struct xfrm_policy *xp, int dir,
318                       const struct km_event *c);
319 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
320 
321 struct xfrm_tmpl;
322 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
323              struct xfrm_policy *pol);
324 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
325 int __xfrm_state_delete(struct xfrm_state *x);
326 
327 struct xfrm_state_afinfo {
328         unsigned int                    family;
329         unsigned int                    proto;
330         __be16                          eth_proto;
331         struct module                   *owner;
332         const struct xfrm_type          *type_map[IPPROTO_MAX];
333         const struct xfrm_type_offload  *type_offload_map[IPPROTO_MAX];
334         struct xfrm_mode                *mode_map[XFRM_MODE_MAX];
335 
336         int                     (*init_flags)(struct xfrm_state *x);
337         void                    (*init_tempsel)(struct xfrm_selector *sel,
338                                                 const struct flowi *fl);
339         void                    (*init_temprop)(struct xfrm_state *x,
340                                                 const struct xfrm_tmpl *tmpl,
341                                                 const xfrm_address_t *daddr,
342                                                 const xfrm_address_t *saddr);
343         int                     (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
344         int                     (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
345         int                     (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
346         int                     (*output_finish)(struct sock *sk, struct sk_buff *skb);
347         int                     (*extract_input)(struct xfrm_state *x,
348                                                  struct sk_buff *skb);
349         int                     (*extract_output)(struct xfrm_state *x,
350                                                   struct sk_buff *skb);
351         int                     (*transport_finish)(struct sk_buff *skb,
352                                                     int async);
353         void                    (*local_error)(struct sk_buff *skb, u32 mtu);
354 };
355 
356 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
357 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
358 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
359 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
360 
361 struct xfrm_input_afinfo {
362         unsigned int            family;
363         int                     (*callback)(struct sk_buff *skb, u8 protocol,
364                                             int err);
365 };
366 
367 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
368 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
369 
370 void xfrm_state_delete_tunnel(struct xfrm_state *x);
371 
372 struct xfrm_type {
373         char                    *description;
374         struct module           *owner;
375         u8                      proto;
376         u8                      flags;
377 #define XFRM_TYPE_NON_FRAGMENT  1
378 #define XFRM_TYPE_REPLAY_PROT   2
379 #define XFRM_TYPE_LOCAL_COADDR  4
380 #define XFRM_TYPE_REMOTE_COADDR 8
381 
382         int                     (*init_state)(struct xfrm_state *x);
383         void                    (*destructor)(struct xfrm_state *);
384         int                     (*input)(struct xfrm_state *, struct sk_buff *skb);
385         int                     (*output)(struct xfrm_state *, struct sk_buff *pskb);
386         int                     (*reject)(struct xfrm_state *, struct sk_buff *,
387                                           const struct flowi *);
388         int                     (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
389         /* Estimate maximal size of result of transformation of a dgram */
390         u32                     (*get_mtu)(struct xfrm_state *, int size);
391 };
392 
393 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
394 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
395 
396 struct xfrm_type_offload {
397         char            *description;
398         struct module   *owner;
399         u8              proto;
400         void            (*encap)(struct xfrm_state *, struct sk_buff *pskb);
401         int             (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
402         int             (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
403 };
404 
405 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
406 int xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
407 
408 struct xfrm_mode {
409         /*
410          * Remove encapsulation header.
411          *
412          * The IP header will be moved over the top of the encapsulation
413          * header.
414          *
415          * On entry, the transport header shall point to where the IP header
416          * should be and the network header shall be set to where the IP
417          * header currently is.  skb->data shall point to the start of the
418          * payload.
419          */
420         int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
421 
422         /*
423          * This is the actual input entry point.
424          *
425          * For transport mode and equivalent this would be identical to
426          * input2 (which does not need to be set).  While tunnel mode
427          * and equivalent would set this to the tunnel encapsulation function
428          * xfrm4_prepare_input that would in turn call input2.
429          */
430         int (*input)(struct xfrm_state *x, struct sk_buff *skb);
431 
432         /*
433          * Add encapsulation header.
434          *
435          * On exit, the transport header will be set to the start of the
436          * encapsulation header to be filled in by x->type->output and
437          * the mac header will be set to the nextheader (protocol for
438          * IPv4) field of the extension header directly preceding the
439          * encapsulation header, or in its absence, that of the top IP
440          * header.  The value of the network header will always point
441          * to the top IP header while skb->data will point to the payload.
442          */
443         int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
444 
445         /*
446          * This is the actual output entry point.
447          *
448          * For transport mode and equivalent this would be identical to
449          * output2 (which does not need to be set).  While tunnel mode
450          * and equivalent would set this to a tunnel encapsulation function
451          * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
452          * call output2.
453          */
454         int (*output)(struct xfrm_state *x, struct sk_buff *skb);
455 
456         /*
457          * Adjust pointers into the packet and do GSO segmentation.
458          */
459         struct sk_buff *(*gso_segment)(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features);
460 
461         /*
462          * Adjust pointers into the packet when IPsec is done at layer2.
463          */
464         void (*xmit)(struct xfrm_state *x, struct sk_buff *skb);
465 
466         struct xfrm_state_afinfo *afinfo;
467         struct module *owner;
468         unsigned int encap;
469         int flags;
470 };
471 
472 /* Flags for xfrm_mode. */
473 enum {
474         XFRM_MODE_FLAG_TUNNEL = 1,
475 };
476 
477 int xfrm_register_mode(struct xfrm_mode *mode, int family);
478 int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
479 
480 static inline int xfrm_af2proto(unsigned int family)
481 {
482         switch(family) {
483         case AF_INET:
484                 return IPPROTO_IPIP;
485         case AF_INET6:
486                 return IPPROTO_IPV6;
487         default:
488                 return 0;
489         }
490 }
491 
492 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
493 {
494         if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
495             (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
496                 return x->inner_mode;
497         else
498                 return x->inner_mode_iaf;
499 }
500 
501 struct xfrm_tmpl {
502 /* id in template is interpreted as:
503  * daddr - destination of tunnel, may be zero for transport mode.
504  * spi   - zero to acquire spi. Not zero if spi is static, then
505  *         daddr must be fixed too.
506  * proto - AH/ESP/IPCOMP
507  */
508         struct xfrm_id          id;
509 
510 /* Source address of tunnel. Ignored, if it is not a tunnel. */
511         xfrm_address_t          saddr;
512 
513         unsigned short          encap_family;
514 
515         u32                     reqid;
516 
517 /* Mode: transport, tunnel etc. */
518         u8                      mode;
519 
520 /* Sharing mode: unique, this session only, this user only etc. */
521         u8                      share;
522 
523 /* May skip this transfomration if no SA is found */
524         u8                      optional;
525 
526 /* Skip aalgos/ealgos/calgos checks. */
527         u8                      allalgs;
528 
529 /* Bit mask of algos allowed for acquisition */
530         u32                     aalgos;
531         u32                     ealgos;
532         u32                     calgos;
533 };
534 
535 #define XFRM_MAX_DEPTH          6
536 #define XFRM_MAX_OFFLOAD_DEPTH  1
537 
538 struct xfrm_policy_walk_entry {
539         struct list_head        all;
540         u8                      dead;
541 };
542 
543 struct xfrm_policy_walk {
544         struct xfrm_policy_walk_entry walk;
545         u8 type;
546         u32 seq;
547 };
548 
549 struct xfrm_policy_queue {
550         struct sk_buff_head     hold_queue;
551         struct timer_list       hold_timer;
552         unsigned long           timeout;
553 };
554 
555 struct xfrm_policy {
556         possible_net_t          xp_net;
557         struct hlist_node       bydst;
558         struct hlist_node       byidx;
559 
560         /* This lock only affects elements except for entry. */
561         rwlock_t                lock;
562         atomic_t                refcnt;
563         struct timer_list       timer;
564 
565         struct flow_cache_object flo;
566         atomic_t                genid;
567         u32                     priority;
568         u32                     index;
569         struct xfrm_mark        mark;
570         struct xfrm_selector    selector;
571         struct xfrm_lifetime_cfg lft;
572         struct xfrm_lifetime_cur curlft;
573         struct xfrm_policy_walk_entry walk;
574         struct xfrm_policy_queue polq;
575         u8                      type;
576         u8                      action;
577         u8                      flags;
578         u8                      xfrm_nr;
579         u16                     family;
580         struct xfrm_sec_ctx     *security;
581         struct xfrm_tmpl        xfrm_vec[XFRM_MAX_DEPTH];
582         struct rcu_head         rcu;
583 };
584 
585 static inline struct net *xp_net(const struct xfrm_policy *xp)
586 {
587         return read_pnet(&xp->xp_net);
588 }
589 
590 struct xfrm_kmaddress {
591         xfrm_address_t          local;
592         xfrm_address_t          remote;
593         u32                     reserved;
594         u16                     family;
595 };
596 
597 struct xfrm_migrate {
598         xfrm_address_t          old_daddr;
599         xfrm_address_t          old_saddr;
600         xfrm_address_t          new_daddr;
601         xfrm_address_t          new_saddr;
602         u8                      proto;
603         u8                      mode;
604         u16                     reserved;
605         u32                     reqid;
606         u16                     old_family;
607         u16                     new_family;
608 };
609 
610 #define XFRM_KM_TIMEOUT                30
611 /* what happened */
612 #define XFRM_REPLAY_UPDATE      XFRM_AE_CR
613 #define XFRM_REPLAY_TIMEOUT     XFRM_AE_CE
614 
615 /* default aevent timeout in units of 100ms */
616 #define XFRM_AE_ETIME                   10
617 /* Async Event timer multiplier */
618 #define XFRM_AE_ETH_M                   10
619 /* default seq threshold size */
620 #define XFRM_AE_SEQT_SIZE               2
621 
622 struct xfrm_mgr {
623         struct list_head        list;
624         int                     (*notify)(struct xfrm_state *x, const struct km_event *c);
625         int                     (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
626         struct xfrm_policy      *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
627         int                     (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
628         int                     (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
629         int                     (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
630         int                     (*migrate)(const struct xfrm_selector *sel,
631                                            u8 dir, u8 type,
632                                            const struct xfrm_migrate *m,
633                                            int num_bundles,
634                                            const struct xfrm_kmaddress *k);
635         bool                    (*is_alive)(const struct km_event *c);
636 };
637 
638 int xfrm_register_km(struct xfrm_mgr *km);
639 int xfrm_unregister_km(struct xfrm_mgr *km);
640 
641 struct xfrm_tunnel_skb_cb {
642         union {
643                 struct inet_skb_parm h4;
644                 struct inet6_skb_parm h6;
645         } header;
646 
647         union {
648                 struct ip_tunnel *ip4;
649                 struct ip6_tnl *ip6;
650         } tunnel;
651 };
652 
653 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
654 
655 /*
656  * This structure is used for the duration where packets are being
657  * transformed by IPsec.  As soon as the packet leaves IPsec the
658  * area beyond the generic IP part may be overwritten.
659  */
660 struct xfrm_skb_cb {
661         struct xfrm_tunnel_skb_cb header;
662 
663         /* Sequence number for replay protection. */
664         union {
665                 struct {
666                         __u32 low;
667                         __u32 hi;
668                 } output;
669                 struct {
670                         __be32 low;
671                         __be32 hi;
672                 } input;
673         } seq;
674 };
675 
676 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
677 
678 /*
679  * This structure is used by the afinfo prepare_input/prepare_output functions
680  * to transmit header information to the mode input/output functions.
681  */
682 struct xfrm_mode_skb_cb {
683         struct xfrm_tunnel_skb_cb header;
684 
685         /* Copied from header for IPv4, always set to zero and DF for IPv6. */
686         __be16 id;
687         __be16 frag_off;
688 
689         /* IP header length (excluding options or extension headers). */
690         u8 ihl;
691 
692         /* TOS for IPv4, class for IPv6. */
693         u8 tos;
694 
695         /* TTL for IPv4, hop limitfor IPv6. */
696         u8 ttl;
697 
698         /* Protocol for IPv4, NH for IPv6. */
699         u8 protocol;
700 
701         /* Option length for IPv4, zero for IPv6. */
702         u8 optlen;
703 
704         /* Used by IPv6 only, zero for IPv4. */
705         u8 flow_lbl[3];
706 };
707 
708 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
709 
710 /*
711  * This structure is used by the input processing to locate the SPI and
712  * related information.
713  */
714 struct xfrm_spi_skb_cb {
715         struct xfrm_tunnel_skb_cb header;
716 
717         unsigned int daddroff;
718         unsigned int family;
719         __be32 seq;
720 };
721 
722 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
723 
724 #ifdef CONFIG_AUDITSYSCALL
725 static inline struct audit_buffer *xfrm_audit_start(const char *op)
726 {
727         struct audit_buffer *audit_buf = NULL;
728 
729         if (audit_enabled == 0)
730                 return NULL;
731         audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
732                                     AUDIT_MAC_IPSEC_EVENT);
733         if (audit_buf == NULL)
734                 return NULL;
735         audit_log_format(audit_buf, "op=%s", op);
736         return audit_buf;
737 }
738 
739 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
740                                              struct audit_buffer *audit_buf)
741 {
742         const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
743                                             audit_get_loginuid(current) :
744                                             INVALID_UID);
745         const unsigned int ses = task_valid ? audit_get_sessionid(current) :
746                 (unsigned int) -1;
747 
748         audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
749         audit_log_task_context(audit_buf);
750 }
751 
752 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
753 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
754                               bool task_valid);
755 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
756 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
757 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
758                                       struct sk_buff *skb);
759 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
760                              __be32 net_seq);
761 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
762 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
763                                __be32 net_seq);
764 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
765                               u8 proto);
766 #else
767 
768 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
769                                          bool task_valid)
770 {
771 }
772 
773 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
774                                             bool task_valid)
775 {
776 }
777 
778 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
779                                         bool task_valid)
780 {
781 }
782 
783 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
784                                            bool task_valid)
785 {
786 }
787 
788 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
789                                              struct sk_buff *skb)
790 {
791 }
792 
793 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
794                                            struct sk_buff *skb, __be32 net_seq)
795 {
796 }
797 
798 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
799                                       u16 family)
800 {
801 }
802 
803 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
804                                       __be32 net_spi, __be32 net_seq)
805 {
806 }
807 
808 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
809                                      struct sk_buff *skb, u8 proto)
810 {
811 }
812 #endif /* CONFIG_AUDITSYSCALL */
813 
814 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
815 {
816         if (likely(policy != NULL))
817                 atomic_inc(&policy->refcnt);
818 }
819 
820 void xfrm_policy_destroy(struct xfrm_policy *policy);
821 
822 static inline void xfrm_pol_put(struct xfrm_policy *policy)
823 {
824         if (atomic_dec_and_test(&policy->refcnt))
825                 xfrm_policy_destroy(policy);
826 }
827 
828 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
829 {
830         int i;
831         for (i = npols - 1; i >= 0; --i)
832                 xfrm_pol_put(pols[i]);
833 }
834 
835 void __xfrm_state_destroy(struct xfrm_state *);
836 
837 static inline void __xfrm_state_put(struct xfrm_state *x)
838 {
839         atomic_dec(&x->refcnt);
840 }
841 
842 static inline void xfrm_state_put(struct xfrm_state *x)
843 {
844         if (atomic_dec_and_test(&x->refcnt))
845                 __xfrm_state_destroy(x);
846 }
847 
848 static inline void xfrm_state_hold(struct xfrm_state *x)
849 {
850         atomic_inc(&x->refcnt);
851 }
852 
853 static inline bool addr_match(const void *token1, const void *token2,
854                               unsigned int prefixlen)
855 {
856         const __be32 *a1 = token1;
857         const __be32 *a2 = token2;
858         unsigned int pdw;
859         unsigned int pbi;
860 
861         pdw = prefixlen >> 5;     /* num of whole u32 in prefix */
862         pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
863 
864         if (pdw)
865                 if (memcmp(a1, a2, pdw << 2))
866                         return false;
867 
868         if (pbi) {
869                 __be32 mask;
870 
871                 mask = htonl((0xffffffff) << (32 - pbi));
872 
873                 if ((a1[pdw] ^ a2[pdw]) & mask)
874                         return false;
875         }
876 
877         return true;
878 }
879 
880 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
881 {
882         /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
883         if (sizeof(long) == 4 && prefixlen == 0)
884                 return true;
885         return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
886 }
887 
888 static __inline__
889 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
890 {
891         __be16 port;
892         switch(fl->flowi_proto) {
893         case IPPROTO_TCP:
894         case IPPROTO_UDP:
895         case IPPROTO_UDPLITE:
896         case IPPROTO_SCTP:
897                 port = uli->ports.sport;
898                 break;
899         case IPPROTO_ICMP:
900         case IPPROTO_ICMPV6:
901                 port = htons(uli->icmpt.type);
902                 break;
903         case IPPROTO_MH:
904                 port = htons(uli->mht.type);
905                 break;
906         case IPPROTO_GRE:
907                 port = htons(ntohl(uli->gre_key) >> 16);
908                 break;
909         default:
910                 port = 0;       /*XXX*/
911         }
912         return port;
913 }
914 
915 static __inline__
916 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
917 {
918         __be16 port;
919         switch(fl->flowi_proto) {
920         case IPPROTO_TCP:
921         case IPPROTO_UDP:
922         case IPPROTO_UDPLITE:
923         case IPPROTO_SCTP:
924                 port = uli->ports.dport;
925                 break;
926         case IPPROTO_ICMP:
927         case IPPROTO_ICMPV6:
928                 port = htons(uli->icmpt.code);
929                 break;
930         case IPPROTO_GRE:
931                 port = htons(ntohl(uli->gre_key) & 0xffff);
932                 break;
933         default:
934                 port = 0;       /*XXX*/
935         }
936         return port;
937 }
938 
939 bool xfrm_selector_match(const struct xfrm_selector *sel,
940                          const struct flowi *fl, unsigned short family);
941 
942 #ifdef CONFIG_SECURITY_NETWORK_XFRM
943 /*      If neither has a context --> match
944  *      Otherwise, both must have a context and the sids, doi, alg must match
945  */
946 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
947 {
948         return ((!s1 && !s2) ||
949                 (s1 && s2 &&
950                  (s1->ctx_sid == s2->ctx_sid) &&
951                  (s1->ctx_doi == s2->ctx_doi) &&
952                  (s1->ctx_alg == s2->ctx_alg)));
953 }
954 #else
955 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
956 {
957         return true;
958 }
959 #endif
960 
961 /* A struct encoding bundle of transformations to apply to some set of flow.
962  *
963  * dst->child points to the next element of bundle.
964  * dst->xfrm  points to an instanse of transformer.
965  *
966  * Due to unfortunate limitations of current routing cache, which we
967  * have no time to fix, it mirrors struct rtable and bound to the same
968  * routing key, including saddr,daddr. However, we can have many of
969  * bundles differing by session id. All the bundles grow from a parent
970  * policy rule.
971  */
972 struct xfrm_dst {
973         union {
974                 struct dst_entry        dst;
975                 struct rtable           rt;
976                 struct rt6_info         rt6;
977         } u;
978         struct dst_entry *route;
979         struct flow_cache_object flo;
980         struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
981         int num_pols, num_xfrms;
982         u32 xfrm_genid;
983         u32 policy_genid;
984         u32 route_mtu_cached;
985         u32 child_mtu_cached;
986         u32 route_cookie;
987         u32 path_cookie;
988 };
989 
990 #ifdef CONFIG_XFRM
991 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
992 {
993         xfrm_pols_put(xdst->pols, xdst->num_pols);
994         dst_release(xdst->route);
995         if (likely(xdst->u.dst.xfrm))
996                 xfrm_state_put(xdst->u.dst.xfrm);
997 }
998 #endif
999 
1000 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1001 
1002 struct xfrm_offload {
1003         /* Output sequence number for replay protection on offloading. */
1004         struct {
1005                 __u32 low;
1006                 __u32 hi;
1007         } seq;
1008 
1009         __u32                   flags;
1010 #define SA_DELETE_REQ           1
1011 #define CRYPTO_DONE             2
1012 #define CRYPTO_NEXT_DONE        4
1013 #define CRYPTO_FALLBACK         8
1014 #define XFRM_GSO_SEGMENT        16
1015 #define XFRM_GRO                32
1016 
1017         __u32                   status;
1018 #define CRYPTO_SUCCESS                          1
1019 #define CRYPTO_GENERIC_ERROR                    2
1020 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED         4
1021 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED        8
1022 #define CRYPTO_TUNNEL_AH_AUTH_FAILED            16
1023 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED           32
1024 #define CRYPTO_INVALID_PACKET_SYNTAX            64
1025 #define CRYPTO_INVALID_PROTOCOL                 128
1026 
1027         __u8                    proto;
1028 };
1029 
1030 struct sec_path {
1031         atomic_t                refcnt;
1032         int                     len;
1033         int                     olen;
1034 
1035         struct xfrm_state       *xvec[XFRM_MAX_DEPTH];
1036         struct xfrm_offload     ovec[XFRM_MAX_OFFLOAD_DEPTH];
1037 };
1038 
1039 static inline int secpath_exists(struct sk_buff *skb)
1040 {
1041 #ifdef CONFIG_XFRM
1042         return skb->sp != NULL;
1043 #else
1044         return 0;
1045 #endif
1046 }
1047 
1048 static inline struct sec_path *
1049 secpath_get(struct sec_path *sp)
1050 {
1051         if (sp)
1052                 atomic_inc(&sp->refcnt);
1053         return sp;
1054 }
1055 
1056 void __secpath_destroy(struct sec_path *sp);
1057 
1058 static inline void
1059 secpath_put(struct sec_path *sp)
1060 {
1061         if (sp && atomic_dec_and_test(&sp->refcnt))
1062                 __secpath_destroy(sp);
1063 }
1064 
1065 struct sec_path *secpath_dup(struct sec_path *src);
1066 int secpath_set(struct sk_buff *skb);
1067 
1068 static inline void
1069 secpath_reset(struct sk_buff *skb)
1070 {
1071 #ifdef CONFIG_XFRM
1072         secpath_put(skb->sp);
1073         skb->sp = NULL;
1074 #endif
1075 }
1076 
1077 static inline int
1078 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1079 {
1080         switch (family) {
1081         case AF_INET:
1082                 return addr->a4 == 0;
1083         case AF_INET6:
1084                 return ipv6_addr_any(&addr->in6);
1085         }
1086         return 0;
1087 }
1088 
1089 static inline int
1090 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1091 {
1092         return  (tmpl->saddr.a4 &&
1093                  tmpl->saddr.a4 != x->props.saddr.a4);
1094 }
1095 
1096 static inline int
1097 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1098 {
1099         return  (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1100                  !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1101 }
1102 
1103 static inline int
1104 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1105 {
1106         switch (family) {
1107         case AF_INET:
1108                 return __xfrm4_state_addr_cmp(tmpl, x);
1109         case AF_INET6:
1110                 return __xfrm6_state_addr_cmp(tmpl, x);
1111         }
1112         return !0;
1113 }
1114 
1115 #ifdef CONFIG_XFRM
1116 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1117                         unsigned short family);
1118 
1119 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1120                                        struct sk_buff *skb,
1121                                        unsigned int family, int reverse)
1122 {
1123         struct net *net = dev_net(skb->dev);
1124         int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1125 
1126         if (sk && sk->sk_policy[XFRM_POLICY_IN])
1127                 return __xfrm_policy_check(sk, ndir, skb, family);
1128 
1129         return  (!net->xfrm.policy_count[dir] && !skb->sp) ||
1130                 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1131                 __xfrm_policy_check(sk, ndir, skb, family);
1132 }
1133 
1134 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1135 {
1136         return __xfrm_policy_check2(sk, dir, skb, family, 0);
1137 }
1138 
1139 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1140 {
1141         return xfrm_policy_check(sk, dir, skb, AF_INET);
1142 }
1143 
1144 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1145 {
1146         return xfrm_policy_check(sk, dir, skb, AF_INET6);
1147 }
1148 
1149 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1150                                              struct sk_buff *skb)
1151 {
1152         return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1153 }
1154 
1155 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1156                                              struct sk_buff *skb)
1157 {
1158         return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1159 }
1160 
1161 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1162                           unsigned int family, int reverse);
1163 
1164 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1165                                       unsigned int family)
1166 {
1167         return __xfrm_decode_session(skb, fl, family, 0);
1168 }
1169 
1170 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1171                                               struct flowi *fl,
1172                                               unsigned int family)
1173 {
1174         return __xfrm_decode_session(skb, fl, family, 1);
1175 }
1176 
1177 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1178 
1179 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1180 {
1181         struct net *net = dev_net(skb->dev);
1182 
1183         return  !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1184                 (skb_dst(skb)->flags & DST_NOXFRM) ||
1185                 __xfrm_route_forward(skb, family);
1186 }
1187 
1188 static inline int xfrm4_route_forward(struct sk_buff *skb)
1189 {
1190         return xfrm_route_forward(skb, AF_INET);
1191 }
1192 
1193 static inline int xfrm6_route_forward(struct sk_buff *skb)
1194 {
1195         return xfrm_route_forward(skb, AF_INET6);
1196 }
1197 
1198 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1199 
1200 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1201 {
1202         sk->sk_policy[0] = NULL;
1203         sk->sk_policy[1] = NULL;
1204         if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1205                 return __xfrm_sk_clone_policy(sk, osk);
1206         return 0;
1207 }
1208 
1209 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1210 
1211 static inline void xfrm_sk_free_policy(struct sock *sk)
1212 {
1213         struct xfrm_policy *pol;
1214 
1215         pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1216         if (unlikely(pol != NULL)) {
1217                 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1218                 sk->sk_policy[0] = NULL;
1219         }
1220         pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1221         if (unlikely(pol != NULL)) {
1222                 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1223                 sk->sk_policy[1] = NULL;
1224         }
1225 }
1226 
1227 void xfrm_garbage_collect(struct net *net);
1228 void xfrm_garbage_collect_deferred(struct net *net);
1229 
1230 #else
1231 
1232 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1233 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1234 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }  
1235 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 
1236 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1237 { 
1238         return 1; 
1239 } 
1240 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1241 {
1242         return 1;
1243 }
1244 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1245 {
1246         return 1;
1247 }
1248 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1249                                               struct flowi *fl,
1250                                               unsigned int family)
1251 {
1252         return -ENOSYS;
1253 }
1254 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1255                                              struct sk_buff *skb)
1256 {
1257         return 1;
1258 }
1259 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1260                                              struct sk_buff *skb)
1261 {
1262         return 1;
1263 }
1264 static inline void xfrm_garbage_collect(struct net *net)
1265 {
1266 }
1267 #endif
1268 
1269 static __inline__
1270 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1271 {
1272         switch (family){
1273         case AF_INET:
1274                 return (xfrm_address_t *)&fl->u.ip4.daddr;
1275         case AF_INET6:
1276                 return (xfrm_address_t *)&fl->u.ip6.daddr;
1277         }
1278         return NULL;
1279 }
1280 
1281 static __inline__
1282 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1283 {
1284         switch (family){
1285         case AF_INET:
1286                 return (xfrm_address_t *)&fl->u.ip4.saddr;
1287         case AF_INET6:
1288                 return (xfrm_address_t *)&fl->u.ip6.saddr;
1289         }
1290         return NULL;
1291 }
1292 
1293 static __inline__
1294 void xfrm_flowi_addr_get(const struct flowi *fl,
1295                          xfrm_address_t *saddr, xfrm_address_t *daddr,
1296                          unsigned short family)
1297 {
1298         switch(family) {
1299         case AF_INET:
1300                 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1301                 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1302                 break;
1303         case AF_INET6:
1304                 saddr->in6 = fl->u.ip6.saddr;
1305                 daddr->in6 = fl->u.ip6.daddr;
1306                 break;
1307         }
1308 }
1309 
1310 static __inline__ int
1311 __xfrm4_state_addr_check(const struct xfrm_state *x,
1312                          const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1313 {
1314         if (daddr->a4 == x->id.daddr.a4 &&
1315             (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1316                 return 1;
1317         return 0;
1318 }
1319 
1320 static __inline__ int
1321 __xfrm6_state_addr_check(const struct xfrm_state *x,
1322                          const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1323 {
1324         if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1325             (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1326              ipv6_addr_any((struct in6_addr *)saddr) || 
1327              ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1328                 return 1;
1329         return 0;
1330 }
1331 
1332 static __inline__ int
1333 xfrm_state_addr_check(const struct xfrm_state *x,
1334                       const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1335                       unsigned short family)
1336 {
1337         switch (family) {
1338         case AF_INET:
1339                 return __xfrm4_state_addr_check(x, daddr, saddr);
1340         case AF_INET6:
1341                 return __xfrm6_state_addr_check(x, daddr, saddr);
1342         }
1343         return 0;
1344 }
1345 
1346 static __inline__ int
1347 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1348                            unsigned short family)
1349 {
1350         switch (family) {
1351         case AF_INET:
1352                 return __xfrm4_state_addr_check(x,
1353                                                 (const xfrm_address_t *)&fl->u.ip4.daddr,
1354                                                 (const xfrm_address_t *)&fl->u.ip4.saddr);
1355         case AF_INET6:
1356                 return __xfrm6_state_addr_check(x,
1357                                                 (const xfrm_address_t *)&fl->u.ip6.daddr,
1358                                                 (const xfrm_address_t *)&fl->u.ip6.saddr);
1359         }
1360         return 0;
1361 }
1362 
1363 static inline int xfrm_state_kern(const struct xfrm_state *x)
1364 {
1365         return atomic_read(&x->tunnel_users);
1366 }
1367 
1368 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1369 {
1370         return (!userproto || proto == userproto ||
1371                 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1372                                                   proto == IPPROTO_ESP ||
1373                                                   proto == IPPROTO_COMP)));
1374 }
1375 
1376 /*
1377  * xfrm algorithm information
1378  */
1379 struct xfrm_algo_aead_info {
1380         char *geniv;
1381         u16 icv_truncbits;
1382 };
1383 
1384 struct xfrm_algo_auth_info {
1385         u16 icv_truncbits;
1386         u16 icv_fullbits;
1387 };
1388 
1389 struct xfrm_algo_encr_info {
1390         char *geniv;
1391         u16 blockbits;
1392         u16 defkeybits;
1393 };
1394 
1395 struct xfrm_algo_comp_info {
1396         u16 threshold;
1397 };
1398 
1399 struct xfrm_algo_desc {
1400         char *name;
1401         char *compat;
1402         u8 available:1;
1403         u8 pfkey_supported:1;
1404         union {
1405                 struct xfrm_algo_aead_info aead;
1406                 struct xfrm_algo_auth_info auth;
1407                 struct xfrm_algo_encr_info encr;
1408                 struct xfrm_algo_comp_info comp;
1409         } uinfo;
1410         struct sadb_alg desc;
1411 };
1412 
1413 /* XFRM protocol handlers.  */
1414 struct xfrm4_protocol {
1415         int (*handler)(struct sk_buff *skb);
1416         int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1417                              int encap_type);
1418         int (*cb_handler)(struct sk_buff *skb, int err);
1419         int (*err_handler)(struct sk_buff *skb, u32 info);
1420 
1421         struct xfrm4_protocol __rcu *next;
1422         int priority;
1423 };
1424 
1425 struct xfrm6_protocol {
1426         int (*handler)(struct sk_buff *skb);
1427         int (*cb_handler)(struct sk_buff *skb, int err);
1428         int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1429                            u8 type, u8 code, int offset, __be32 info);
1430 
1431         struct xfrm6_protocol __rcu *next;
1432         int priority;
1433 };
1434 
1435 /* XFRM tunnel handlers.  */
1436 struct xfrm_tunnel {
1437         int (*handler)(struct sk_buff *skb);
1438         int (*err_handler)(struct sk_buff *skb, u32 info);
1439 
1440         struct xfrm_tunnel __rcu *next;
1441         int priority;
1442 };
1443 
1444 struct xfrm6_tunnel {
1445         int (*handler)(struct sk_buff *skb);
1446         int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1447                            u8 type, u8 code, int offset, __be32 info);
1448         struct xfrm6_tunnel __rcu *next;
1449         int priority;
1450 };
1451 
1452 void xfrm_init(void);
1453 void xfrm4_init(void);
1454 int xfrm_state_init(struct net *net);
1455 void xfrm_state_fini(struct net *net);
1456 void xfrm4_state_init(void);
1457 void xfrm4_protocol_init(void);
1458 #ifdef CONFIG_XFRM
1459 int xfrm6_init(void);
1460 void xfrm6_fini(void);
1461 int xfrm6_state_init(void);
1462 void xfrm6_state_fini(void);
1463 int xfrm6_protocol_init(void);
1464 void xfrm6_protocol_fini(void);
1465 #else
1466 static inline int xfrm6_init(void)
1467 {
1468         return 0;
1469 }
1470 static inline void xfrm6_fini(void)
1471 {
1472         ;
1473 }
1474 #endif
1475 
1476 #ifdef CONFIG_XFRM_STATISTICS
1477 int xfrm_proc_init(struct net *net);
1478 void xfrm_proc_fini(struct net *net);
1479 #endif
1480 
1481 int xfrm_sysctl_init(struct net *net);
1482 #ifdef CONFIG_SYSCTL
1483 void xfrm_sysctl_fini(struct net *net);
1484 #else
1485 static inline void xfrm_sysctl_fini(struct net *net)
1486 {
1487 }
1488 #endif
1489 
1490 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1491                           struct xfrm_address_filter *filter);
1492 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1493                     int (*func)(struct xfrm_state *, int, void*), void *);
1494 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1495 struct xfrm_state *xfrm_state_alloc(struct net *net);
1496 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1497                                    const xfrm_address_t *saddr,
1498                                    const struct flowi *fl,
1499                                    struct xfrm_tmpl *tmpl,
1500                                    struct xfrm_policy *pol, int *err,
1501                                    unsigned short family);
1502 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1503                                        xfrm_address_t *daddr,
1504                                        xfrm_address_t *saddr,
1505                                        unsigned short family,
1506                                        u8 mode, u8 proto, u32 reqid);
1507 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1508                                               unsigned short family);
1509 int xfrm_state_check_expire(struct xfrm_state *x);
1510 void xfrm_state_insert(struct xfrm_state *x);
1511 int xfrm_state_add(struct xfrm_state *x);
1512 int xfrm_state_update(struct xfrm_state *x);
1513 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1514                                      const xfrm_address_t *daddr, __be32 spi,
1515                                      u8 proto, unsigned short family);
1516 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1517                                             const xfrm_address_t *daddr,
1518                                             const xfrm_address_t *saddr,
1519                                             u8 proto,
1520                                             unsigned short family);
1521 #ifdef CONFIG_XFRM_SUB_POLICY
1522 int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1523                    unsigned short family, struct net *net);
1524 int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1525                     unsigned short family);
1526 #else
1527 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1528                                  int n, unsigned short family, struct net *net)
1529 {
1530         return -ENOSYS;
1531 }
1532 
1533 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1534                                   int n, unsigned short family)
1535 {
1536         return -ENOSYS;
1537 }
1538 #endif
1539 
1540 struct xfrmk_sadinfo {
1541         u32 sadhcnt; /* current hash bkts */
1542         u32 sadhmcnt; /* max allowed hash bkts */
1543         u32 sadcnt; /* current running count */
1544 };
1545 
1546 struct xfrmk_spdinfo {
1547         u32 incnt;
1548         u32 outcnt;
1549         u32 fwdcnt;
1550         u32 inscnt;
1551         u32 outscnt;
1552         u32 fwdscnt;
1553         u32 spdhcnt;
1554         u32 spdhmcnt;
1555 };
1556 
1557 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1558 int xfrm_state_delete(struct xfrm_state *x);
1559 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid);
1560 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1561 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1562 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1563 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1564 int xfrm_init_replay(struct xfrm_state *x);
1565 int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1566 int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1567 int xfrm_init_state(struct xfrm_state *x);
1568 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1569 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1570 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1571 int xfrm_output_resume(struct sk_buff *skb, int err);
1572 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1573 int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1574 void xfrm_local_error(struct sk_buff *skb, int mtu);
1575 int xfrm4_extract_header(struct sk_buff *skb);
1576 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1577 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1578                     int encap_type);
1579 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1580 int xfrm4_rcv(struct sk_buff *skb);
1581 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1582 
1583 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1584 {
1585         XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1586         XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1587         XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1588         return xfrm_input(skb, nexthdr, spi, 0);
1589 }
1590 
1591 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1592 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1593 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1594 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1595 int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1596 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1597 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1598 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1599 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1600 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1601 int xfrm6_extract_header(struct sk_buff *skb);
1602 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1603 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1604                   struct ip6_tnl *t);
1605 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1606 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1607 int xfrm6_rcv(struct sk_buff *skb);
1608 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1609                      xfrm_address_t *saddr, u8 proto);
1610 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1611 int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1612 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1613 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1614 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1615 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1616 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1617 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1618 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1619 int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1620 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1621 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1622 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1623                           u8 **prevhdr);
1624 
1625 #ifdef CONFIG_XFRM
1626 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1627 int xfrm_user_policy(struct sock *sk, int optname,
1628                      u8 __user *optval, int optlen);
1629 #else
1630 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1631 {
1632         return -ENOPROTOOPT;
1633 } 
1634 
1635 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1636 {
1637         /* should not happen */
1638         kfree_skb(skb);
1639         return 0;
1640 }
1641 #endif
1642 
1643 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1644                                     const xfrm_address_t *saddr,
1645                                     const xfrm_address_t *daddr,
1646                                     int family);
1647 
1648 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1649 
1650 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1651 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1652                      int (*func)(struct xfrm_policy *, int, int, void*),
1653                      void *);
1654 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1655 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1656 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1657                                           u8 type, int dir,
1658                                           struct xfrm_selector *sel,
1659                                           struct xfrm_sec_ctx *ctx, int delete,
1660                                           int *err);
1661 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
1662                                      u32 id, int delete, int *err);
1663 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1664 void xfrm_policy_hash_rebuild(struct net *net);
1665 u32 xfrm_get_acqseq(void);
1666 int verify_spi_info(u8 proto, u32 min, u32 max);
1667 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1668 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1669                                  u8 mode, u32 reqid, u8 proto,
1670                                  const xfrm_address_t *daddr,
1671                                  const xfrm_address_t *saddr, int create,
1672                                  unsigned short family);
1673 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1674 
1675 #ifdef CONFIG_XFRM_MIGRATE
1676 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1677                const struct xfrm_migrate *m, int num_bundles,
1678                const struct xfrm_kmaddress *k);
1679 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1680 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1681                                       struct xfrm_migrate *m);
1682 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1683                  struct xfrm_migrate *m, int num_bundles,
1684                  struct xfrm_kmaddress *k, struct net *net);
1685 #endif
1686 
1687 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1688 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1689 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1690               xfrm_address_t *addr);
1691 
1692 void xfrm_input_init(void);
1693 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1694 
1695 void xfrm_probe_algs(void);
1696 int xfrm_count_pfkey_auth_supported(void);
1697 int xfrm_count_pfkey_enc_supported(void);
1698 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1699 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1700 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1701 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1702 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1703 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1704 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1705 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1706 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1707                                             int probe);
1708 
1709 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1710                                     const xfrm_address_t *b)
1711 {
1712         return ipv6_addr_equal((const struct in6_addr *)a,
1713                                (const struct in6_addr *)b);
1714 }
1715 
1716 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1717                                    const xfrm_address_t *b,
1718                                    sa_family_t family)
1719 {
1720         switch (family) {
1721         default:
1722         case AF_INET:
1723                 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1724         case AF_INET6:
1725                 return xfrm6_addr_equal(a, b);
1726         }
1727 }
1728 
1729 static inline int xfrm_policy_id2dir(u32 index)
1730 {
1731         return index & 7;
1732 }
1733 
1734 #ifdef CONFIG_XFRM
1735 static inline int xfrm_aevent_is_on(struct net *net)
1736 {
1737         struct sock *nlsk;
1738         int ret = 0;
1739 
1740         rcu_read_lock();
1741         nlsk = rcu_dereference(net->xfrm.nlsk);
1742         if (nlsk)
1743                 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1744         rcu_read_unlock();
1745         return ret;
1746 }
1747 
1748 static inline int xfrm_acquire_is_on(struct net *net)
1749 {
1750         struct sock *nlsk;
1751         int ret = 0;
1752 
1753         rcu_read_lock();
1754         nlsk = rcu_dereference(net->xfrm.nlsk);
1755         if (nlsk)
1756                 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1757         rcu_read_unlock();
1758 
1759         return ret;
1760 }
1761 #endif
1762 
1763 static inline int aead_len(struct xfrm_algo_aead *alg)
1764 {
1765         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1766 }
1767 
1768 static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1769 {
1770         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1771 }
1772 
1773 static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1774 {
1775         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1776 }
1777 
1778 static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1779 {
1780         return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1781 }
1782 
1783 #ifdef CONFIG_XFRM_MIGRATE
1784 static inline int xfrm_replay_clone(struct xfrm_state *x,
1785                                      struct xfrm_state *orig)
1786 {
1787         x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1788                                 GFP_KERNEL);
1789         if (!x->replay_esn)
1790                 return -ENOMEM;
1791 
1792         x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1793         x->replay_esn->replay_window = orig->replay_esn->replay_window;
1794 
1795         x->preplay_esn = kmemdup(x->replay_esn,
1796                                  xfrm_replay_state_esn_len(x->replay_esn),
1797                                  GFP_KERNEL);
1798         if (!x->preplay_esn) {
1799                 kfree(x->replay_esn);
1800                 return -ENOMEM;
1801         }
1802 
1803         return 0;
1804 }
1805 
1806 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1807 {
1808         return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1809 }
1810 
1811 
1812 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1813 {
1814         return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1815 }
1816 
1817 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1818 {
1819         return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1820 }
1821 
1822 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1823 {
1824         int i;
1825         for (i = 0; i < n; i++)
1826                 xfrm_state_put(*(states + i));
1827 }
1828 
1829 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1830 {
1831         int i;
1832         for (i = 0; i < n; i++)
1833                 xfrm_state_delete(*(states + i));
1834 }
1835 #endif
1836 
1837 #ifdef CONFIG_XFRM
1838 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1839 {
1840         return skb->sp->xvec[skb->sp->len - 1];
1841 }
1842 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1843 {
1844         struct sec_path *sp = skb->sp;
1845 
1846         if (!sp || !sp->olen || sp->len != sp->olen)
1847                 return NULL;
1848 
1849         return &sp->ovec[sp->olen - 1];
1850 }
1851 #endif
1852 
1853 void __net_init xfrm_dev_init(void);
1854 
1855 #ifdef CONFIG_XFRM_OFFLOAD
1856 int validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features);
1857 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1858                        struct xfrm_user_offload *xuo);
1859 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1860 
1861 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1862 {
1863         struct xfrm_state_offload *xso = &x->xso;
1864 
1865         if (xso->dev)
1866                 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1867 }
1868 
1869 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1870 {
1871         struct xfrm_state_offload *xso = &x->xso;
1872          struct net_device *dev = xso->dev;
1873 
1874         if (dev && dev->xfrmdev_ops) {
1875                 dev->xfrmdev_ops->xdo_dev_state_free(x);
1876                 xso->dev = NULL;
1877                 dev_put(dev);
1878         }
1879 }
1880 #else
1881 static inline int validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features)
1882 {
1883         return 0;
1884 }
1885 
1886 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1887 {
1888         return 0;
1889 }
1890 
1891 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1892 {
1893 }
1894 
1895 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1896 {
1897 }
1898 
1899 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1900 {
1901         return false;
1902 }
1903 #endif
1904 
1905 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1906 {
1907         if (attrs[XFRMA_MARK])
1908                 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1909         else
1910                 m->v = m->m = 0;
1911 
1912         return m->v & m->m;
1913 }
1914 
1915 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1916 {
1917         int ret = 0;
1918 
1919         if (m->m | m->v)
1920                 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1921         return ret;
1922 }
1923 
1924 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1925                                     unsigned int family)
1926 {
1927         bool tunnel = false;
1928 
1929         switch(family) {
1930         case AF_INET:
1931                 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1932                         tunnel = true;
1933                 break;
1934         case AF_INET6:
1935                 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1936                         tunnel = true;
1937                 break;
1938         }
1939         if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
1940                 return -EINVAL;
1941 
1942         return 0;
1943 }
1944 #endif  /* _NET_XFRM_H */
1945 

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