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TOMOYO Linux Cross Reference
Linux/include/net/xfrm.h

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  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 
 27 #include <linux/interrupt.h>
 28 
 29 #ifdef CONFIG_XFRM_STATISTICS
 30 #include <net/snmp.h>
 31 #endif
 32 
 33 #define XFRM_PROTO_ESP          50
 34 #define XFRM_PROTO_AH           51
 35 #define XFRM_PROTO_COMP         108
 36 #define XFRM_PROTO_IPIP         4
 37 #define XFRM_PROTO_IPV6         41
 38 #define XFRM_PROTO_ROUTING      IPPROTO_ROUTING
 39 #define XFRM_PROTO_DSTOPTS      IPPROTO_DSTOPTS
 40 
 41 #define XFRM_ALIGN4(len)        (((len) + 3) & ~3)
 42 #define XFRM_ALIGN8(len)        (((len) + 7) & ~7)
 43 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
 44         MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
 45 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
 46         MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
 47 #define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
 48         MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
 49 
 50 #ifdef CONFIG_XFRM_STATISTICS
 51 #define XFRM_INC_STATS(net, field)      SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
 52 #else
 53 #define XFRM_INC_STATS(net, field)      ((void)(net))
 54 #endif
 55 
 56 
 57 /* Organization of SPD aka "XFRM rules"
 58    ------------------------------------
 59 
 60    Basic objects:
 61    - policy rule, struct xfrm_policy (=SPD entry)
 62    - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
 63    - instance of a transformer, struct xfrm_state (=SA)
 64    - template to clone xfrm_state, struct xfrm_tmpl
 65 
 66    SPD is plain linear list of xfrm_policy rules, ordered by priority.
 67    (To be compatible with existing pfkeyv2 implementations,
 68    many rules with priority of 0x7fffffff are allowed to exist and
 69    such rules are ordered in an unpredictable way, thanks to bsd folks.)
 70 
 71    Lookup is plain linear search until the first match with selector.
 72 
 73    If "action" is "block", then we prohibit the flow, otherwise:
 74    if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
 75    policy entry has list of up to XFRM_MAX_DEPTH transformations,
 76    described by templates xfrm_tmpl. Each template is resolved
 77    to a complete xfrm_state (see below) and we pack bundle of transformations
 78    to a dst_entry returned to requestor.
 79 
 80    dst -. xfrm  .-> xfrm_state #1
 81     |---. child .-> dst -. xfrm .-> xfrm_state #2
 82                      |---. child .-> dst -. xfrm .-> xfrm_state #3
 83                                       |---. child .-> NULL
 84 
 85    Bundles are cached at xrfm_policy struct (field ->bundles).
 86 
 87 
 88    Resolution of xrfm_tmpl
 89    -----------------------
 90    Template contains:
 91    1. ->mode            Mode: transport or tunnel
 92    2. ->id.proto        Protocol: AH/ESP/IPCOMP
 93    3. ->id.daddr        Remote tunnel endpoint, ignored for transport mode.
 94       Q: allow to resolve security gateway?
 95    4. ->id.spi          If not zero, static SPI.
 96    5. ->saddr           Local tunnel endpoint, ignored for transport mode.
 97    6. ->algos           List of allowed algos. Plain bitmask now.
 98       Q: ealgos, aalgos, calgos. What a mess...
 99    7. ->share           Sharing mode.
100       Q: how to implement private sharing mode? To add struct sock* to
101       flow id?
102 
103    Having this template we search through SAD searching for entries
104    with appropriate mode/proto/algo, permitted by selector.
105    If no appropriate entry found, it is requested from key manager.
106 
107    PROBLEMS:
108    Q: How to find all the bundles referring to a physical path for
109       PMTU discovery? Seems, dst should contain list of all parents...
110       and enter to infinite locking hierarchy disaster.
111       No! It is easier, we will not search for them, let them find us.
112       We add genid to each dst plus pointer to genid of raw IP route,
113       pmtu disc will update pmtu on raw IP route and increase its genid.
114       dst_check() will see this for top level and trigger resyncing
115       metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
116  */
117 
118 struct xfrm_state_walk {
119         struct list_head        all;
120         u8                      state;
121         u8                      dying;
122         u8                      proto;
123         u32                     seq;
124         struct xfrm_address_filter *filter;
125 };
126 
127 struct xfrm_state_offload {
128         struct net_device       *dev;
129         unsigned long           offload_handle;
130         unsigned int            num_exthdrs;
131         u8                      flags;
132 };
133 
134 /* Full description of state of transformer. */
135 struct xfrm_state {
136         possible_net_t          xs_net;
137         union {
138                 struct hlist_node       gclist;
139                 struct hlist_node       bydst;
140         };
141         struct hlist_node       bysrc;
142         struct hlist_node       byspi;
143 
144         refcount_t              refcnt;
145         spinlock_t              lock;
146 
147         struct xfrm_id          id;
148         struct xfrm_selector    sel;
149         struct xfrm_mark        mark;
150         u32                     tfcpad;
151 
152         u32                     genid;
153 
154         /* Key manager bits */
155         struct xfrm_state_walk  km;
156 
157         /* Parameters of this state. */
158         struct {
159                 u32             reqid;
160                 u8              mode;
161                 u8              replay_window;
162                 u8              aalgo, ealgo, calgo;
163                 u8              flags;
164                 u16             family;
165                 xfrm_address_t  saddr;
166                 int             header_len;
167                 int             trailer_len;
168                 u32             extra_flags;
169                 u32             output_mark;
170         } props;
171 
172         struct xfrm_lifetime_cfg lft;
173 
174         /* Data for transformer */
175         struct xfrm_algo_auth   *aalg;
176         struct xfrm_algo        *ealg;
177         struct xfrm_algo        *calg;
178         struct xfrm_algo_aead   *aead;
179         const char              *geniv;
180 
181         /* Data for encapsulator */
182         struct xfrm_encap_tmpl  *encap;
183 
184         /* Data for care-of address */
185         xfrm_address_t  *coaddr;
186 
187         /* IPComp needs an IPIP tunnel for handling uncompressed packets */
188         struct xfrm_state       *tunnel;
189 
190         /* If a tunnel, number of users + 1 */
191         atomic_t                tunnel_users;
192 
193         /* State for replay detection */
194         struct xfrm_replay_state replay;
195         struct xfrm_replay_state_esn *replay_esn;
196 
197         /* Replay detection state at the time we sent the last notification */
198         struct xfrm_replay_state preplay;
199         struct xfrm_replay_state_esn *preplay_esn;
200 
201         /* The functions for replay detection. */
202         const struct xfrm_replay *repl;
203 
204         /* internal flag that only holds state for delayed aevent at the
205          * moment
206         */
207         u32                     xflags;
208 
209         /* Replay detection notification settings */
210         u32                     replay_maxage;
211         u32                     replay_maxdiff;
212 
213         /* Replay detection notification timer */
214         struct timer_list       rtimer;
215 
216         /* Statistics */
217         struct xfrm_stats       stats;
218 
219         struct xfrm_lifetime_cur curlft;
220         struct tasklet_hrtimer  mtimer;
221 
222         struct xfrm_state_offload xso;
223 
224         /* used to fix curlft->add_time when changing date */
225         long            saved_tmo;
226 
227         /* Last used time */
228         unsigned long           lastused;
229 
230         struct page_frag xfrag;
231 
232         /* Reference to data common to all the instances of this
233          * transformer. */
234         const struct xfrm_type  *type;
235         struct xfrm_mode        *inner_mode;
236         struct xfrm_mode        *inner_mode_iaf;
237         struct xfrm_mode        *outer_mode;
238 
239         const struct xfrm_type_offload  *type_offload;
240 
241         /* Security context */
242         struct xfrm_sec_ctx     *security;
243 
244         /* Private data of this transformer, format is opaque,
245          * interpreted by xfrm_type methods. */
246         void                    *data;
247 };
248 
249 static inline struct net *xs_net(struct xfrm_state *x)
250 {
251         return read_pnet(&x->xs_net);
252 }
253 
254 /* xflags - make enum if more show up */
255 #define XFRM_TIME_DEFER 1
256 #define XFRM_SOFT_EXPIRE 2
257 
258 enum {
259         XFRM_STATE_VOID,
260         XFRM_STATE_ACQ,
261         XFRM_STATE_VALID,
262         XFRM_STATE_ERROR,
263         XFRM_STATE_EXPIRED,
264         XFRM_STATE_DEAD
265 };
266 
267 /* callback structure passed from either netlink or pfkey */
268 struct km_event {
269         union {
270                 u32 hard;
271                 u32 proto;
272                 u32 byid;
273                 u32 aevent;
274                 u32 type;
275         } data;
276 
277         u32     seq;
278         u32     portid;
279         u32     event;
280         struct net *net;
281 };
282 
283 struct xfrm_replay {
284         void    (*advance)(struct xfrm_state *x, __be32 net_seq);
285         int     (*check)(struct xfrm_state *x,
286                          struct sk_buff *skb,
287                          __be32 net_seq);
288         int     (*recheck)(struct xfrm_state *x,
289                            struct sk_buff *skb,
290                            __be32 net_seq);
291         void    (*notify)(struct xfrm_state *x, int event);
292         int     (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
293 };
294 
295 struct net_device;
296 struct xfrm_type;
297 struct xfrm_dst;
298 struct xfrm_policy_afinfo {
299         struct dst_ops          *dst_ops;
300         struct dst_entry        *(*dst_lookup)(struct net *net,
301                                                int tos, int oif,
302                                                const xfrm_address_t *saddr,
303                                                const xfrm_address_t *daddr,
304                                                u32 mark);
305         int                     (*get_saddr)(struct net *net, int oif,
306                                              xfrm_address_t *saddr,
307                                              xfrm_address_t *daddr,
308                                              u32 mark);
309         void                    (*decode_session)(struct sk_buff *skb,
310                                                   struct flowi *fl,
311                                                   int reverse);
312         int                     (*get_tos)(const struct flowi *fl);
313         int                     (*init_path)(struct xfrm_dst *path,
314                                              struct dst_entry *dst,
315                                              int nfheader_len);
316         int                     (*fill_dst)(struct xfrm_dst *xdst,
317                                             struct net_device *dev,
318                                             const struct flowi *fl);
319         struct dst_entry        *(*blackhole_route)(struct net *net, struct dst_entry *orig);
320 };
321 
322 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
323 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
324 void km_policy_notify(struct xfrm_policy *xp, int dir,
325                       const struct km_event *c);
326 void xfrm_policy_cache_flush(void);
327 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
328 
329 struct xfrm_tmpl;
330 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
331              struct xfrm_policy *pol);
332 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
333 int __xfrm_state_delete(struct xfrm_state *x);
334 
335 struct xfrm_state_afinfo {
336         unsigned int                    family;
337         unsigned int                    proto;
338         __be16                          eth_proto;
339         struct module                   *owner;
340         const struct xfrm_type          *type_map[IPPROTO_MAX];
341         const struct xfrm_type_offload  *type_offload_map[IPPROTO_MAX];
342         struct xfrm_mode                *mode_map[XFRM_MODE_MAX];
343 
344         int                     (*init_flags)(struct xfrm_state *x);
345         void                    (*init_tempsel)(struct xfrm_selector *sel,
346                                                 const struct flowi *fl);
347         void                    (*init_temprop)(struct xfrm_state *x,
348                                                 const struct xfrm_tmpl *tmpl,
349                                                 const xfrm_address_t *daddr,
350                                                 const xfrm_address_t *saddr);
351         int                     (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
352         int                     (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
353         int                     (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
354         int                     (*output_finish)(struct sock *sk, struct sk_buff *skb);
355         int                     (*extract_input)(struct xfrm_state *x,
356                                                  struct sk_buff *skb);
357         int                     (*extract_output)(struct xfrm_state *x,
358                                                   struct sk_buff *skb);
359         int                     (*transport_finish)(struct sk_buff *skb,
360                                                     int async);
361         void                    (*local_error)(struct sk_buff *skb, u32 mtu);
362 };
363 
364 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
365 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
366 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
367 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
368 
369 struct xfrm_input_afinfo {
370         unsigned int            family;
371         int                     (*callback)(struct sk_buff *skb, u8 protocol,
372                                             int err);
373 };
374 
375 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
376 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
377 
378 void xfrm_flush_gc(void);
379 void xfrm_state_delete_tunnel(struct xfrm_state *x);
380 
381 struct xfrm_type {
382         char                    *description;
383         struct module           *owner;
384         u8                      proto;
385         u8                      flags;
386 #define XFRM_TYPE_NON_FRAGMENT  1
387 #define XFRM_TYPE_REPLAY_PROT   2
388 #define XFRM_TYPE_LOCAL_COADDR  4
389 #define XFRM_TYPE_REMOTE_COADDR 8
390 
391         int                     (*init_state)(struct xfrm_state *x);
392         void                    (*destructor)(struct xfrm_state *);
393         int                     (*input)(struct xfrm_state *, struct sk_buff *skb);
394         int                     (*output)(struct xfrm_state *, struct sk_buff *pskb);
395         int                     (*reject)(struct xfrm_state *, struct sk_buff *,
396                                           const struct flowi *);
397         int                     (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
398         /* Estimate maximal size of result of transformation of a dgram */
399         u32                     (*get_mtu)(struct xfrm_state *, int size);
400 };
401 
402 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
403 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
404 
405 struct xfrm_type_offload {
406         char            *description;
407         struct module   *owner;
408         u8              proto;
409         void            (*encap)(struct xfrm_state *, struct sk_buff *pskb);
410         int             (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
411         int             (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
412 };
413 
414 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
415 int xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
416 
417 struct xfrm_mode {
418         /*
419          * Remove encapsulation header.
420          *
421          * The IP header will be moved over the top of the encapsulation
422          * header.
423          *
424          * On entry, the transport header shall point to where the IP header
425          * should be and the network header shall be set to where the IP
426          * header currently is.  skb->data shall point to the start of the
427          * payload.
428          */
429         int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
430 
431         /*
432          * This is the actual input entry point.
433          *
434          * For transport mode and equivalent this would be identical to
435          * input2 (which does not need to be set).  While tunnel mode
436          * and equivalent would set this to the tunnel encapsulation function
437          * xfrm4_prepare_input that would in turn call input2.
438          */
439         int (*input)(struct xfrm_state *x, struct sk_buff *skb);
440 
441         /*
442          * Add encapsulation header.
443          *
444          * On exit, the transport header will be set to the start of the
445          * encapsulation header to be filled in by x->type->output and
446          * the mac header will be set to the nextheader (protocol for
447          * IPv4) field of the extension header directly preceding the
448          * encapsulation header, or in its absence, that of the top IP
449          * header.  The value of the network header will always point
450          * to the top IP header while skb->data will point to the payload.
451          */
452         int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
453 
454         /*
455          * This is the actual output entry point.
456          *
457          * For transport mode and equivalent this would be identical to
458          * output2 (which does not need to be set).  While tunnel mode
459          * and equivalent would set this to a tunnel encapsulation function
460          * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
461          * call output2.
462          */
463         int (*output)(struct xfrm_state *x, struct sk_buff *skb);
464 
465         /*
466          * Adjust pointers into the packet and do GSO segmentation.
467          */
468         struct sk_buff *(*gso_segment)(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features);
469 
470         /*
471          * Adjust pointers into the packet when IPsec is done at layer2.
472          */
473         void (*xmit)(struct xfrm_state *x, struct sk_buff *skb);
474 
475         struct xfrm_state_afinfo *afinfo;
476         struct module *owner;
477         unsigned int encap;
478         int flags;
479 };
480 
481 /* Flags for xfrm_mode. */
482 enum {
483         XFRM_MODE_FLAG_TUNNEL = 1,
484 };
485 
486 int xfrm_register_mode(struct xfrm_mode *mode, int family);
487 int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
488 
489 static inline int xfrm_af2proto(unsigned int family)
490 {
491         switch(family) {
492         case AF_INET:
493                 return IPPROTO_IPIP;
494         case AF_INET6:
495                 return IPPROTO_IPV6;
496         default:
497                 return 0;
498         }
499 }
500 
501 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
502 {
503         if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
504             (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
505                 return x->inner_mode;
506         else
507                 return x->inner_mode_iaf;
508 }
509 
510 struct xfrm_tmpl {
511 /* id in template is interpreted as:
512  * daddr - destination of tunnel, may be zero for transport mode.
513  * spi   - zero to acquire spi. Not zero if spi is static, then
514  *         daddr must be fixed too.
515  * proto - AH/ESP/IPCOMP
516  */
517         struct xfrm_id          id;
518 
519 /* Source address of tunnel. Ignored, if it is not a tunnel. */
520         xfrm_address_t          saddr;
521 
522         unsigned short          encap_family;
523 
524         u32                     reqid;
525 
526 /* Mode: transport, tunnel etc. */
527         u8                      mode;
528 
529 /* Sharing mode: unique, this session only, this user only etc. */
530         u8                      share;
531 
532 /* May skip this transfomration if no SA is found */
533         u8                      optional;
534 
535 /* Skip aalgos/ealgos/calgos checks. */
536         u8                      allalgs;
537 
538 /* Bit mask of algos allowed for acquisition */
539         u32                     aalgos;
540         u32                     ealgos;
541         u32                     calgos;
542 };
543 
544 #define XFRM_MAX_DEPTH          6
545 #define XFRM_MAX_OFFLOAD_DEPTH  1
546 
547 struct xfrm_policy_walk_entry {
548         struct list_head        all;
549         u8                      dead;
550 };
551 
552 struct xfrm_policy_walk {
553         struct xfrm_policy_walk_entry walk;
554         u8 type;
555         u32 seq;
556 };
557 
558 struct xfrm_policy_queue {
559         struct sk_buff_head     hold_queue;
560         struct timer_list       hold_timer;
561         unsigned long           timeout;
562 };
563 
564 struct xfrm_policy {
565         possible_net_t          xp_net;
566         struct hlist_node       bydst;
567         struct hlist_node       byidx;
568 
569         /* This lock only affects elements except for entry. */
570         rwlock_t                lock;
571         refcount_t              refcnt;
572         struct timer_list       timer;
573 
574         atomic_t                genid;
575         u32                     priority;
576         u32                     index;
577         struct xfrm_mark        mark;
578         struct xfrm_selector    selector;
579         struct xfrm_lifetime_cfg lft;
580         struct xfrm_lifetime_cur curlft;
581         struct xfrm_policy_walk_entry walk;
582         struct xfrm_policy_queue polq;
583         u8                      type;
584         u8                      action;
585         u8                      flags;
586         u8                      xfrm_nr;
587         u16                     family;
588         struct xfrm_sec_ctx     *security;
589         struct xfrm_tmpl        xfrm_vec[XFRM_MAX_DEPTH];
590         struct rcu_head         rcu;
591 };
592 
593 static inline struct net *xp_net(const struct xfrm_policy *xp)
594 {
595         return read_pnet(&xp->xp_net);
596 }
597 
598 struct xfrm_kmaddress {
599         xfrm_address_t          local;
600         xfrm_address_t          remote;
601         u32                     reserved;
602         u16                     family;
603 };
604 
605 struct xfrm_migrate {
606         xfrm_address_t          old_daddr;
607         xfrm_address_t          old_saddr;
608         xfrm_address_t          new_daddr;
609         xfrm_address_t          new_saddr;
610         u8                      proto;
611         u8                      mode;
612         u16                     reserved;
613         u32                     reqid;
614         u16                     old_family;
615         u16                     new_family;
616 };
617 
618 #define XFRM_KM_TIMEOUT                30
619 /* what happened */
620 #define XFRM_REPLAY_UPDATE      XFRM_AE_CR
621 #define XFRM_REPLAY_TIMEOUT     XFRM_AE_CE
622 
623 /* default aevent timeout in units of 100ms */
624 #define XFRM_AE_ETIME                   10
625 /* Async Event timer multiplier */
626 #define XFRM_AE_ETH_M                   10
627 /* default seq threshold size */
628 #define XFRM_AE_SEQT_SIZE               2
629 
630 struct xfrm_mgr {
631         struct list_head        list;
632         int                     (*notify)(struct xfrm_state *x, const struct km_event *c);
633         int                     (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
634         struct xfrm_policy      *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
635         int                     (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
636         int                     (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
637         int                     (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
638         int                     (*migrate)(const struct xfrm_selector *sel,
639                                            u8 dir, u8 type,
640                                            const struct xfrm_migrate *m,
641                                            int num_bundles,
642                                            const struct xfrm_kmaddress *k,
643                                            const struct xfrm_encap_tmpl *encap);
644         bool                    (*is_alive)(const struct km_event *c);
645 };
646 
647 int xfrm_register_km(struct xfrm_mgr *km);
648 int xfrm_unregister_km(struct xfrm_mgr *km);
649 
650 struct xfrm_tunnel_skb_cb {
651         union {
652                 struct inet_skb_parm h4;
653                 struct inet6_skb_parm h6;
654         } header;
655 
656         union {
657                 struct ip_tunnel *ip4;
658                 struct ip6_tnl *ip6;
659         } tunnel;
660 };
661 
662 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
663 
664 /*
665  * This structure is used for the duration where packets are being
666  * transformed by IPsec.  As soon as the packet leaves IPsec the
667  * area beyond the generic IP part may be overwritten.
668  */
669 struct xfrm_skb_cb {
670         struct xfrm_tunnel_skb_cb header;
671 
672         /* Sequence number for replay protection. */
673         union {
674                 struct {
675                         __u32 low;
676                         __u32 hi;
677                 } output;
678                 struct {
679                         __be32 low;
680                         __be32 hi;
681                 } input;
682         } seq;
683 };
684 
685 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
686 
687 /*
688  * This structure is used by the afinfo prepare_input/prepare_output functions
689  * to transmit header information to the mode input/output functions.
690  */
691 struct xfrm_mode_skb_cb {
692         struct xfrm_tunnel_skb_cb header;
693 
694         /* Copied from header for IPv4, always set to zero and DF for IPv6. */
695         __be16 id;
696         __be16 frag_off;
697 
698         /* IP header length (excluding options or extension headers). */
699         u8 ihl;
700 
701         /* TOS for IPv4, class for IPv6. */
702         u8 tos;
703 
704         /* TTL for IPv4, hop limitfor IPv6. */
705         u8 ttl;
706 
707         /* Protocol for IPv4, NH for IPv6. */
708         u8 protocol;
709 
710         /* Option length for IPv4, zero for IPv6. */
711         u8 optlen;
712 
713         /* Used by IPv6 only, zero for IPv4. */
714         u8 flow_lbl[3];
715 };
716 
717 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
718 
719 /*
720  * This structure is used by the input processing to locate the SPI and
721  * related information.
722  */
723 struct xfrm_spi_skb_cb {
724         struct xfrm_tunnel_skb_cb header;
725 
726         unsigned int daddroff;
727         unsigned int family;
728         __be32 seq;
729 };
730 
731 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
732 
733 #ifdef CONFIG_AUDITSYSCALL
734 static inline struct audit_buffer *xfrm_audit_start(const char *op)
735 {
736         struct audit_buffer *audit_buf = NULL;
737 
738         if (audit_enabled == 0)
739                 return NULL;
740         audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
741                                     AUDIT_MAC_IPSEC_EVENT);
742         if (audit_buf == NULL)
743                 return NULL;
744         audit_log_format(audit_buf, "op=%s", op);
745         return audit_buf;
746 }
747 
748 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
749                                              struct audit_buffer *audit_buf)
750 {
751         const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
752                                             audit_get_loginuid(current) :
753                                             INVALID_UID);
754         const unsigned int ses = task_valid ? audit_get_sessionid(current) :
755                 (unsigned int) -1;
756 
757         audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
758         audit_log_task_context(audit_buf);
759 }
760 
761 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
762 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
763                               bool task_valid);
764 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
765 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
766 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
767                                       struct sk_buff *skb);
768 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
769                              __be32 net_seq);
770 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
771 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
772                                __be32 net_seq);
773 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
774                               u8 proto);
775 #else
776 
777 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
778                                          bool task_valid)
779 {
780 }
781 
782 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
783                                             bool task_valid)
784 {
785 }
786 
787 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
788                                         bool task_valid)
789 {
790 }
791 
792 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
793                                            bool task_valid)
794 {
795 }
796 
797 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
798                                              struct sk_buff *skb)
799 {
800 }
801 
802 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
803                                            struct sk_buff *skb, __be32 net_seq)
804 {
805 }
806 
807 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
808                                       u16 family)
809 {
810 }
811 
812 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
813                                       __be32 net_spi, __be32 net_seq)
814 {
815 }
816 
817 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
818                                      struct sk_buff *skb, u8 proto)
819 {
820 }
821 #endif /* CONFIG_AUDITSYSCALL */
822 
823 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
824 {
825         if (likely(policy != NULL))
826                 refcount_inc(&policy->refcnt);
827 }
828 
829 void xfrm_policy_destroy(struct xfrm_policy *policy);
830 
831 static inline void xfrm_pol_put(struct xfrm_policy *policy)
832 {
833         if (refcount_dec_and_test(&policy->refcnt))
834                 xfrm_policy_destroy(policy);
835 }
836 
837 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
838 {
839         int i;
840         for (i = npols - 1; i >= 0; --i)
841                 xfrm_pol_put(pols[i]);
842 }
843 
844 void __xfrm_state_destroy(struct xfrm_state *);
845 
846 static inline void __xfrm_state_put(struct xfrm_state *x)
847 {
848         refcount_dec(&x->refcnt);
849 }
850 
851 static inline void xfrm_state_put(struct xfrm_state *x)
852 {
853         if (refcount_dec_and_test(&x->refcnt))
854                 __xfrm_state_destroy(x);
855 }
856 
857 static inline void xfrm_state_hold(struct xfrm_state *x)
858 {
859         refcount_inc(&x->refcnt);
860 }
861 
862 static inline bool addr_match(const void *token1, const void *token2,
863                               unsigned int prefixlen)
864 {
865         const __be32 *a1 = token1;
866         const __be32 *a2 = token2;
867         unsigned int pdw;
868         unsigned int pbi;
869 
870         pdw = prefixlen >> 5;     /* num of whole u32 in prefix */
871         pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
872 
873         if (pdw)
874                 if (memcmp(a1, a2, pdw << 2))
875                         return false;
876 
877         if (pbi) {
878                 __be32 mask;
879 
880                 mask = htonl((0xffffffff) << (32 - pbi));
881 
882                 if ((a1[pdw] ^ a2[pdw]) & mask)
883                         return false;
884         }
885 
886         return true;
887 }
888 
889 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
890 {
891         /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
892         if (sizeof(long) == 4 && prefixlen == 0)
893                 return true;
894         return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
895 }
896 
897 static __inline__
898 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
899 {
900         __be16 port;
901         switch(fl->flowi_proto) {
902         case IPPROTO_TCP:
903         case IPPROTO_UDP:
904         case IPPROTO_UDPLITE:
905         case IPPROTO_SCTP:
906                 port = uli->ports.sport;
907                 break;
908         case IPPROTO_ICMP:
909         case IPPROTO_ICMPV6:
910                 port = htons(uli->icmpt.type);
911                 break;
912         case IPPROTO_MH:
913                 port = htons(uli->mht.type);
914                 break;
915         case IPPROTO_GRE:
916                 port = htons(ntohl(uli->gre_key) >> 16);
917                 break;
918         default:
919                 port = 0;       /*XXX*/
920         }
921         return port;
922 }
923 
924 static __inline__
925 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
926 {
927         __be16 port;
928         switch(fl->flowi_proto) {
929         case IPPROTO_TCP:
930         case IPPROTO_UDP:
931         case IPPROTO_UDPLITE:
932         case IPPROTO_SCTP:
933                 port = uli->ports.dport;
934                 break;
935         case IPPROTO_ICMP:
936         case IPPROTO_ICMPV6:
937                 port = htons(uli->icmpt.code);
938                 break;
939         case IPPROTO_GRE:
940                 port = htons(ntohl(uli->gre_key) & 0xffff);
941                 break;
942         default:
943                 port = 0;       /*XXX*/
944         }
945         return port;
946 }
947 
948 bool xfrm_selector_match(const struct xfrm_selector *sel,
949                          const struct flowi *fl, unsigned short family);
950 
951 #ifdef CONFIG_SECURITY_NETWORK_XFRM
952 /*      If neither has a context --> match
953  *      Otherwise, both must have a context and the sids, doi, alg must match
954  */
955 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
956 {
957         return ((!s1 && !s2) ||
958                 (s1 && s2 &&
959                  (s1->ctx_sid == s2->ctx_sid) &&
960                  (s1->ctx_doi == s2->ctx_doi) &&
961                  (s1->ctx_alg == s2->ctx_alg)));
962 }
963 #else
964 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
965 {
966         return true;
967 }
968 #endif
969 
970 /* A struct encoding bundle of transformations to apply to some set of flow.
971  *
972  * xdst->child points to the next element of bundle.
973  * dst->xfrm  points to an instanse of transformer.
974  *
975  * Due to unfortunate limitations of current routing cache, which we
976  * have no time to fix, it mirrors struct rtable and bound to the same
977  * routing key, including saddr,daddr. However, we can have many of
978  * bundles differing by session id. All the bundles grow from a parent
979  * policy rule.
980  */
981 struct xfrm_dst {
982         union {
983                 struct dst_entry        dst;
984                 struct rtable           rt;
985                 struct rt6_info         rt6;
986         } u;
987         struct dst_entry *route;
988         struct dst_entry *child;
989         struct dst_entry *path;
990         struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
991         int num_pols, num_xfrms;
992         u32 xfrm_genid;
993         u32 policy_genid;
994         u32 route_mtu_cached;
995         u32 child_mtu_cached;
996         u32 route_cookie;
997         u32 path_cookie;
998 };
999 
1000 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
1001 {
1002 #ifdef CONFIG_XFRM
1003         if (dst->xfrm) {
1004                 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
1005 
1006                 return xdst->path;
1007         }
1008 #endif
1009         return (struct dst_entry *) dst;
1010 }
1011 
1012 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
1013 {
1014 #ifdef CONFIG_XFRM
1015         if (dst->xfrm) {
1016                 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
1017                 return xdst->child;
1018         }
1019 #endif
1020         return NULL;
1021 }
1022 
1023 #ifdef CONFIG_XFRM
1024 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
1025 {
1026         xdst->child = child;
1027 }
1028 
1029 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
1030 {
1031         xfrm_pols_put(xdst->pols, xdst->num_pols);
1032         dst_release(xdst->route);
1033         if (likely(xdst->u.dst.xfrm))
1034                 xfrm_state_put(xdst->u.dst.xfrm);
1035 }
1036 #endif
1037 
1038 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1039 
1040 struct xfrm_offload {
1041         /* Output sequence number for replay protection on offloading. */
1042         struct {
1043                 __u32 low;
1044                 __u32 hi;
1045         } seq;
1046 
1047         __u32                   flags;
1048 #define SA_DELETE_REQ           1
1049 #define CRYPTO_DONE             2
1050 #define CRYPTO_NEXT_DONE        4
1051 #define CRYPTO_FALLBACK         8
1052 #define XFRM_GSO_SEGMENT        16
1053 #define XFRM_GRO                32
1054 #define XFRM_ESP_NO_TRAILER     64
1055 #define XFRM_DEV_RESUME         128
1056 
1057         __u32                   status;
1058 #define CRYPTO_SUCCESS                          1
1059 #define CRYPTO_GENERIC_ERROR                    2
1060 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED         4
1061 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED        8
1062 #define CRYPTO_TUNNEL_AH_AUTH_FAILED            16
1063 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED           32
1064 #define CRYPTO_INVALID_PACKET_SYNTAX            64
1065 #define CRYPTO_INVALID_PROTOCOL                 128
1066 
1067         __u8                    proto;
1068 };
1069 
1070 struct sec_path {
1071         refcount_t              refcnt;
1072         int                     len;
1073         int                     olen;
1074 
1075         struct xfrm_state       *xvec[XFRM_MAX_DEPTH];
1076         struct xfrm_offload     ovec[XFRM_MAX_OFFLOAD_DEPTH];
1077 };
1078 
1079 static inline int secpath_exists(struct sk_buff *skb)
1080 {
1081 #ifdef CONFIG_XFRM
1082         return skb->sp != NULL;
1083 #else
1084         return 0;
1085 #endif
1086 }
1087 
1088 static inline struct sec_path *
1089 secpath_get(struct sec_path *sp)
1090 {
1091         if (sp)
1092                 refcount_inc(&sp->refcnt);
1093         return sp;
1094 }
1095 
1096 void __secpath_destroy(struct sec_path *sp);
1097 
1098 static inline void
1099 secpath_put(struct sec_path *sp)
1100 {
1101         if (sp && refcount_dec_and_test(&sp->refcnt))
1102                 __secpath_destroy(sp);
1103 }
1104 
1105 struct sec_path *secpath_dup(struct sec_path *src);
1106 int secpath_set(struct sk_buff *skb);
1107 
1108 static inline void
1109 secpath_reset(struct sk_buff *skb)
1110 {
1111 #ifdef CONFIG_XFRM
1112         secpath_put(skb->sp);
1113         skb->sp = NULL;
1114 #endif
1115 }
1116 
1117 static inline int
1118 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1119 {
1120         switch (family) {
1121         case AF_INET:
1122                 return addr->a4 == 0;
1123         case AF_INET6:
1124                 return ipv6_addr_any(&addr->in6);
1125         }
1126         return 0;
1127 }
1128 
1129 static inline int
1130 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1131 {
1132         return  (tmpl->saddr.a4 &&
1133                  tmpl->saddr.a4 != x->props.saddr.a4);
1134 }
1135 
1136 static inline int
1137 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1138 {
1139         return  (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1140                  !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1141 }
1142 
1143 static inline int
1144 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1145 {
1146         switch (family) {
1147         case AF_INET:
1148                 return __xfrm4_state_addr_cmp(tmpl, x);
1149         case AF_INET6:
1150                 return __xfrm6_state_addr_cmp(tmpl, x);
1151         }
1152         return !0;
1153 }
1154 
1155 #ifdef CONFIG_XFRM
1156 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1157                         unsigned short family);
1158 
1159 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1160                                        struct sk_buff *skb,
1161                                        unsigned int family, int reverse)
1162 {
1163         struct net *net = dev_net(skb->dev);
1164         int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1165 
1166         if (sk && sk->sk_policy[XFRM_POLICY_IN])
1167                 return __xfrm_policy_check(sk, ndir, skb, family);
1168 
1169         return  (!net->xfrm.policy_count[dir] && !skb->sp) ||
1170                 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1171                 __xfrm_policy_check(sk, ndir, skb, family);
1172 }
1173 
1174 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1175 {
1176         return __xfrm_policy_check2(sk, dir, skb, family, 0);
1177 }
1178 
1179 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1180 {
1181         return xfrm_policy_check(sk, dir, skb, AF_INET);
1182 }
1183 
1184 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1185 {
1186         return xfrm_policy_check(sk, dir, skb, AF_INET6);
1187 }
1188 
1189 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1190                                              struct sk_buff *skb)
1191 {
1192         return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1193 }
1194 
1195 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1196                                              struct sk_buff *skb)
1197 {
1198         return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1199 }
1200 
1201 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1202                           unsigned int family, int reverse);
1203 
1204 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1205                                       unsigned int family)
1206 {
1207         return __xfrm_decode_session(skb, fl, family, 0);
1208 }
1209 
1210 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1211                                               struct flowi *fl,
1212                                               unsigned int family)
1213 {
1214         return __xfrm_decode_session(skb, fl, family, 1);
1215 }
1216 
1217 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1218 
1219 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1220 {
1221         struct net *net = dev_net(skb->dev);
1222 
1223         return  !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1224                 (skb_dst(skb)->flags & DST_NOXFRM) ||
1225                 __xfrm_route_forward(skb, family);
1226 }
1227 
1228 static inline int xfrm4_route_forward(struct sk_buff *skb)
1229 {
1230         return xfrm_route_forward(skb, AF_INET);
1231 }
1232 
1233 static inline int xfrm6_route_forward(struct sk_buff *skb)
1234 {
1235         return xfrm_route_forward(skb, AF_INET6);
1236 }
1237 
1238 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1239 
1240 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1241 {
1242         sk->sk_policy[0] = NULL;
1243         sk->sk_policy[1] = NULL;
1244         if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1245                 return __xfrm_sk_clone_policy(sk, osk);
1246         return 0;
1247 }
1248 
1249 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1250 
1251 static inline void xfrm_sk_free_policy(struct sock *sk)
1252 {
1253         struct xfrm_policy *pol;
1254 
1255         pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1256         if (unlikely(pol != NULL)) {
1257                 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1258                 sk->sk_policy[0] = NULL;
1259         }
1260         pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1261         if (unlikely(pol != NULL)) {
1262                 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1263                 sk->sk_policy[1] = NULL;
1264         }
1265 }
1266 
1267 #else
1268 
1269 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1270 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1271 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1272 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1273 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1274 {
1275         return 1;
1276 }
1277 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1278 {
1279         return 1;
1280 }
1281 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1282 {
1283         return 1;
1284 }
1285 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1286                                               struct flowi *fl,
1287                                               unsigned int family)
1288 {
1289         return -ENOSYS;
1290 }
1291 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1292                                              struct sk_buff *skb)
1293 {
1294         return 1;
1295 }
1296 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1297                                              struct sk_buff *skb)
1298 {
1299         return 1;
1300 }
1301 #endif
1302 
1303 static __inline__
1304 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1305 {
1306         switch (family){
1307         case AF_INET:
1308                 return (xfrm_address_t *)&fl->u.ip4.daddr;
1309         case AF_INET6:
1310                 return (xfrm_address_t *)&fl->u.ip6.daddr;
1311         }
1312         return NULL;
1313 }
1314 
1315 static __inline__
1316 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1317 {
1318         switch (family){
1319         case AF_INET:
1320                 return (xfrm_address_t *)&fl->u.ip4.saddr;
1321         case AF_INET6:
1322                 return (xfrm_address_t *)&fl->u.ip6.saddr;
1323         }
1324         return NULL;
1325 }
1326 
1327 static __inline__
1328 void xfrm_flowi_addr_get(const struct flowi *fl,
1329                          xfrm_address_t *saddr, xfrm_address_t *daddr,
1330                          unsigned short family)
1331 {
1332         switch(family) {
1333         case AF_INET:
1334                 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1335                 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1336                 break;
1337         case AF_INET6:
1338                 saddr->in6 = fl->u.ip6.saddr;
1339                 daddr->in6 = fl->u.ip6.daddr;
1340                 break;
1341         }
1342 }
1343 
1344 static __inline__ int
1345 __xfrm4_state_addr_check(const struct xfrm_state *x,
1346                          const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1347 {
1348         if (daddr->a4 == x->id.daddr.a4 &&
1349             (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1350                 return 1;
1351         return 0;
1352 }
1353 
1354 static __inline__ int
1355 __xfrm6_state_addr_check(const struct xfrm_state *x,
1356                          const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1357 {
1358         if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1359             (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1360              ipv6_addr_any((struct in6_addr *)saddr) ||
1361              ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1362                 return 1;
1363         return 0;
1364 }
1365 
1366 static __inline__ int
1367 xfrm_state_addr_check(const struct xfrm_state *x,
1368                       const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1369                       unsigned short family)
1370 {
1371         switch (family) {
1372         case AF_INET:
1373                 return __xfrm4_state_addr_check(x, daddr, saddr);
1374         case AF_INET6:
1375                 return __xfrm6_state_addr_check(x, daddr, saddr);
1376         }
1377         return 0;
1378 }
1379 
1380 static __inline__ int
1381 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1382                            unsigned short family)
1383 {
1384         switch (family) {
1385         case AF_INET:
1386                 return __xfrm4_state_addr_check(x,
1387                                                 (const xfrm_address_t *)&fl->u.ip4.daddr,
1388                                                 (const xfrm_address_t *)&fl->u.ip4.saddr);
1389         case AF_INET6:
1390                 return __xfrm6_state_addr_check(x,
1391                                                 (const xfrm_address_t *)&fl->u.ip6.daddr,
1392                                                 (const xfrm_address_t *)&fl->u.ip6.saddr);
1393         }
1394         return 0;
1395 }
1396 
1397 static inline int xfrm_state_kern(const struct xfrm_state *x)
1398 {
1399         return atomic_read(&x->tunnel_users);
1400 }
1401 
1402 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1403 {
1404         return (!userproto || proto == userproto ||
1405                 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1406                                                   proto == IPPROTO_ESP ||
1407                                                   proto == IPPROTO_COMP)));
1408 }
1409 
1410 /*
1411  * xfrm algorithm information
1412  */
1413 struct xfrm_algo_aead_info {
1414         char *geniv;
1415         u16 icv_truncbits;
1416 };
1417 
1418 struct xfrm_algo_auth_info {
1419         u16 icv_truncbits;
1420         u16 icv_fullbits;
1421 };
1422 
1423 struct xfrm_algo_encr_info {
1424         char *geniv;
1425         u16 blockbits;
1426         u16 defkeybits;
1427 };
1428 
1429 struct xfrm_algo_comp_info {
1430         u16 threshold;
1431 };
1432 
1433 struct xfrm_algo_desc {
1434         char *name;
1435         char *compat;
1436         u8 available:1;
1437         u8 pfkey_supported:1;
1438         union {
1439                 struct xfrm_algo_aead_info aead;
1440                 struct xfrm_algo_auth_info auth;
1441                 struct xfrm_algo_encr_info encr;
1442                 struct xfrm_algo_comp_info comp;
1443         } uinfo;
1444         struct sadb_alg desc;
1445 };
1446 
1447 /* XFRM protocol handlers.  */
1448 struct xfrm4_protocol {
1449         int (*handler)(struct sk_buff *skb);
1450         int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1451                              int encap_type);
1452         int (*cb_handler)(struct sk_buff *skb, int err);
1453         int (*err_handler)(struct sk_buff *skb, u32 info);
1454 
1455         struct xfrm4_protocol __rcu *next;
1456         int priority;
1457 };
1458 
1459 struct xfrm6_protocol {
1460         int (*handler)(struct sk_buff *skb);
1461         int (*cb_handler)(struct sk_buff *skb, int err);
1462         int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1463                            u8 type, u8 code, int offset, __be32 info);
1464 
1465         struct xfrm6_protocol __rcu *next;
1466         int priority;
1467 };
1468 
1469 /* XFRM tunnel handlers.  */
1470 struct xfrm_tunnel {
1471         int (*handler)(struct sk_buff *skb);
1472         int (*err_handler)(struct sk_buff *skb, u32 info);
1473 
1474         struct xfrm_tunnel __rcu *next;
1475         int priority;
1476 };
1477 
1478 struct xfrm6_tunnel {
1479         int (*handler)(struct sk_buff *skb);
1480         int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1481                            u8 type, u8 code, int offset, __be32 info);
1482         struct xfrm6_tunnel __rcu *next;
1483         int priority;
1484 };
1485 
1486 void xfrm_init(void);
1487 void xfrm4_init(void);
1488 int xfrm_state_init(struct net *net);
1489 void xfrm_state_fini(struct net *net);
1490 void xfrm4_state_init(void);
1491 void xfrm4_protocol_init(void);
1492 #ifdef CONFIG_XFRM
1493 int xfrm6_init(void);
1494 void xfrm6_fini(void);
1495 int xfrm6_state_init(void);
1496 void xfrm6_state_fini(void);
1497 int xfrm6_protocol_init(void);
1498 void xfrm6_protocol_fini(void);
1499 #else
1500 static inline int xfrm6_init(void)
1501 {
1502         return 0;
1503 }
1504 static inline void xfrm6_fini(void)
1505 {
1506         ;
1507 }
1508 #endif
1509 
1510 #ifdef CONFIG_XFRM_STATISTICS
1511 int xfrm_proc_init(struct net *net);
1512 void xfrm_proc_fini(struct net *net);
1513 #endif
1514 
1515 int xfrm_sysctl_init(struct net *net);
1516 #ifdef CONFIG_SYSCTL
1517 void xfrm_sysctl_fini(struct net *net);
1518 #else
1519 static inline void xfrm_sysctl_fini(struct net *net)
1520 {
1521 }
1522 #endif
1523 
1524 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1525                           struct xfrm_address_filter *filter);
1526 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1527                     int (*func)(struct xfrm_state *, int, void*), void *);
1528 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1529 struct xfrm_state *xfrm_state_alloc(struct net *net);
1530 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1531                                    const xfrm_address_t *saddr,
1532                                    const struct flowi *fl,
1533                                    struct xfrm_tmpl *tmpl,
1534                                    struct xfrm_policy *pol, int *err,
1535                                    unsigned short family);
1536 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1537                                        xfrm_address_t *daddr,
1538                                        xfrm_address_t *saddr,
1539                                        unsigned short family,
1540                                        u8 mode, u8 proto, u32 reqid);
1541 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1542                                               unsigned short family);
1543 int xfrm_state_check_expire(struct xfrm_state *x);
1544 void xfrm_state_insert(struct xfrm_state *x);
1545 int xfrm_state_add(struct xfrm_state *x);
1546 int xfrm_state_update(struct xfrm_state *x);
1547 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1548                                      const xfrm_address_t *daddr, __be32 spi,
1549                                      u8 proto, unsigned short family);
1550 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1551                                             const xfrm_address_t *daddr,
1552                                             const xfrm_address_t *saddr,
1553                                             u8 proto,
1554                                             unsigned short family);
1555 #ifdef CONFIG_XFRM_SUB_POLICY
1556 int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1557                    unsigned short family, struct net *net);
1558 int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1559                     unsigned short family);
1560 #else
1561 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1562                                  int n, unsigned short family, struct net *net)
1563 {
1564         return -ENOSYS;
1565 }
1566 
1567 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1568                                   int n, unsigned short family)
1569 {
1570         return -ENOSYS;
1571 }
1572 #endif
1573 
1574 struct xfrmk_sadinfo {
1575         u32 sadhcnt; /* current hash bkts */
1576         u32 sadhmcnt; /* max allowed hash bkts */
1577         u32 sadcnt; /* current running count */
1578 };
1579 
1580 struct xfrmk_spdinfo {
1581         u32 incnt;
1582         u32 outcnt;
1583         u32 fwdcnt;
1584         u32 inscnt;
1585         u32 outscnt;
1586         u32 fwdscnt;
1587         u32 spdhcnt;
1588         u32 spdhmcnt;
1589 };
1590 
1591 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1592 int xfrm_state_delete(struct xfrm_state *x);
1593 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid);
1594 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1595 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1596 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1597 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1598 int xfrm_init_replay(struct xfrm_state *x);
1599 int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1600 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1601 int xfrm_init_state(struct xfrm_state *x);
1602 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1603 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1604 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1605 int xfrm_trans_queue(struct sk_buff *skb,
1606                      int (*finish)(struct net *, struct sock *,
1607                                    struct sk_buff *));
1608 int xfrm_output_resume(struct sk_buff *skb, int err);
1609 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1610 int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1611 void xfrm_local_error(struct sk_buff *skb, int mtu);
1612 int xfrm4_extract_header(struct sk_buff *skb);
1613 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1614 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1615                     int encap_type);
1616 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1617 int xfrm4_rcv(struct sk_buff *skb);
1618 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1619 
1620 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1621 {
1622         XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1623         XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1624         XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1625         return xfrm_input(skb, nexthdr, spi, 0);
1626 }
1627 
1628 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1629 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1630 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1631 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1632 int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1633 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1634 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1635 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1636 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1637 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1638 int xfrm6_extract_header(struct sk_buff *skb);
1639 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1640 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1641                   struct ip6_tnl *t);
1642 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1643 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1644 int xfrm6_rcv(struct sk_buff *skb);
1645 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1646                      xfrm_address_t *saddr, u8 proto);
1647 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1648 int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1649 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1650 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1651 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1652 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1653 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1654 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1655 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1656 int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1657 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1658 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1659 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1660                           u8 **prevhdr);
1661 
1662 #ifdef CONFIG_XFRM
1663 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1664 int xfrm_user_policy(struct sock *sk, int optname,
1665                      u8 __user *optval, int optlen);
1666 #else
1667 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1668 {
1669         return -ENOPROTOOPT;
1670 }
1671 
1672 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1673 {
1674         /* should not happen */
1675         kfree_skb(skb);
1676         return 0;
1677 }
1678 #endif
1679 
1680 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1681                                     const xfrm_address_t *saddr,
1682                                     const xfrm_address_t *daddr,
1683                                     int family, u32 mark);
1684 
1685 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1686 
1687 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1688 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1689                      int (*func)(struct xfrm_policy *, int, int, void*),
1690                      void *);
1691 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1692 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1693 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1694                                           u8 type, int dir,
1695                                           struct xfrm_selector *sel,
1696                                           struct xfrm_sec_ctx *ctx, int delete,
1697                                           int *err);
1698 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
1699                                      u32 id, int delete, int *err);
1700 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1701 void xfrm_policy_hash_rebuild(struct net *net);
1702 u32 xfrm_get_acqseq(void);
1703 int verify_spi_info(u8 proto, u32 min, u32 max);
1704 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1705 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1706                                  u8 mode, u32 reqid, u8 proto,
1707                                  const xfrm_address_t *daddr,
1708                                  const xfrm_address_t *saddr, int create,
1709                                  unsigned short family);
1710 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1711 
1712 #ifdef CONFIG_XFRM_MIGRATE
1713 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1714                const struct xfrm_migrate *m, int num_bundles,
1715                const struct xfrm_kmaddress *k,
1716                const struct xfrm_encap_tmpl *encap);
1717 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1718 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1719                                       struct xfrm_migrate *m,
1720                                       struct xfrm_encap_tmpl *encap);
1721 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1722                  struct xfrm_migrate *m, int num_bundles,
1723                  struct xfrm_kmaddress *k, struct net *net,
1724                  struct xfrm_encap_tmpl *encap);
1725 #endif
1726 
1727 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1728 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1729 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1730               xfrm_address_t *addr);
1731 
1732 void xfrm_input_init(void);
1733 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1734 
1735 void xfrm_probe_algs(void);
1736 int xfrm_count_pfkey_auth_supported(void);
1737 int xfrm_count_pfkey_enc_supported(void);
1738 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1739 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1740 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1741 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1742 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1743 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1744 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1745 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1746 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1747                                             int probe);
1748 
1749 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1750                                     const xfrm_address_t *b)
1751 {
1752         return ipv6_addr_equal((const struct in6_addr *)a,
1753                                (const struct in6_addr *)b);
1754 }
1755 
1756 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1757                                    const xfrm_address_t *b,
1758                                    sa_family_t family)
1759 {
1760         switch (family) {
1761         default:
1762         case AF_INET:
1763                 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1764         case AF_INET6:
1765                 return xfrm6_addr_equal(a, b);
1766         }
1767 }
1768 
1769 static inline int xfrm_policy_id2dir(u32 index)
1770 {
1771         return index & 7;
1772 }
1773 
1774 #ifdef CONFIG_XFRM
1775 static inline int xfrm_aevent_is_on(struct net *net)
1776 {
1777         struct sock *nlsk;
1778         int ret = 0;
1779 
1780         rcu_read_lock();
1781         nlsk = rcu_dereference(net->xfrm.nlsk);
1782         if (nlsk)
1783                 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1784         rcu_read_unlock();
1785         return ret;
1786 }
1787 
1788 static inline int xfrm_acquire_is_on(struct net *net)
1789 {
1790         struct sock *nlsk;
1791         int ret = 0;
1792 
1793         rcu_read_lock();
1794         nlsk = rcu_dereference(net->xfrm.nlsk);
1795         if (nlsk)
1796                 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1797         rcu_read_unlock();
1798 
1799         return ret;
1800 }
1801 #endif
1802 
1803 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1804 {
1805         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1806 }
1807 
1808 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1809 {
1810         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1811 }
1812 
1813 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1814 {
1815         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1816 }
1817 
1818 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1819 {
1820         return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1821 }
1822 
1823 #ifdef CONFIG_XFRM_MIGRATE
1824 static inline int xfrm_replay_clone(struct xfrm_state *x,
1825                                      struct xfrm_state *orig)
1826 {
1827         x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1828                                 GFP_KERNEL);
1829         if (!x->replay_esn)
1830                 return -ENOMEM;
1831 
1832         x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1833         x->replay_esn->replay_window = orig->replay_esn->replay_window;
1834 
1835         x->preplay_esn = kmemdup(x->replay_esn,
1836                                  xfrm_replay_state_esn_len(x->replay_esn),
1837                                  GFP_KERNEL);
1838         if (!x->preplay_esn) {
1839                 kfree(x->replay_esn);
1840                 return -ENOMEM;
1841         }
1842 
1843         return 0;
1844 }
1845 
1846 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1847 {
1848         return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1849 }
1850 
1851 
1852 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1853 {
1854         return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1855 }
1856 
1857 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1858 {
1859         return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1860 }
1861 
1862 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1863 {
1864         int i;
1865         for (i = 0; i < n; i++)
1866                 xfrm_state_put(*(states + i));
1867 }
1868 
1869 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1870 {
1871         int i;
1872         for (i = 0; i < n; i++)
1873                 xfrm_state_delete(*(states + i));
1874 }
1875 #endif
1876 
1877 #ifdef CONFIG_XFRM
1878 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1879 {
1880         return skb->sp->xvec[skb->sp->len - 1];
1881 }
1882 #endif
1883 
1884 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1885 {
1886 #ifdef CONFIG_XFRM
1887         struct sec_path *sp = skb->sp;
1888 
1889         if (!sp || !sp->olen || sp->len != sp->olen)
1890                 return NULL;
1891 
1892         return &sp->ovec[sp->olen - 1];
1893 #else
1894         return NULL;
1895 #endif
1896 }
1897 
1898 void __init xfrm_dev_init(void);
1899 
1900 #ifdef CONFIG_XFRM_OFFLOAD
1901 void xfrm_dev_resume(struct sk_buff *skb);
1902 void xfrm_dev_backlog(struct softnet_data *sd);
1903 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1904 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1905                        struct xfrm_user_offload *xuo);
1906 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1907 
1908 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1909 {
1910         struct xfrm_state_offload *xso = &x->xso;
1911 
1912         if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1913                 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1914 }
1915 
1916 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1917 {
1918         struct xfrm_state *x = dst->xfrm;
1919         struct xfrm_dst *xdst;
1920 
1921         if (!x || !x->type_offload)
1922                 return false;
1923 
1924         xdst = (struct xfrm_dst *) dst;
1925         if (!x->xso.offload_handle && !xdst->child->xfrm)
1926                 return true;
1927         if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1928             !xdst->child->xfrm)
1929                 return true;
1930 
1931         return false;
1932 }
1933 
1934 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1935 {
1936         struct xfrm_state_offload *xso = &x->xso;
1937 
1938         if (xso->dev)
1939                 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1940 }
1941 
1942 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1943 {
1944         struct xfrm_state_offload *xso = &x->xso;
1945          struct net_device *dev = xso->dev;
1946 
1947         if (dev && dev->xfrmdev_ops) {
1948                 if (dev->xfrmdev_ops->xdo_dev_state_free)
1949                         dev->xfrmdev_ops->xdo_dev_state_free(x);
1950                 xso->dev = NULL;
1951                 dev_put(dev);
1952         }
1953 }
1954 #else
1955 static inline void xfrm_dev_resume(struct sk_buff *skb)
1956 {
1957 }
1958 
1959 static inline void xfrm_dev_backlog(struct softnet_data *sd)
1960 {
1961 }
1962 
1963 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1964 {
1965         return skb;
1966 }
1967 
1968 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1969 {
1970         return 0;
1971 }
1972 
1973 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1974 {
1975 }
1976 
1977 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1978 {
1979 }
1980 
1981 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1982 {
1983         return false;
1984 }
1985 
1986 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1987 {
1988 }
1989 
1990 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1991 {
1992         return false;
1993 }
1994 #endif
1995 
1996 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1997 {
1998         if (attrs[XFRMA_MARK])
1999                 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
2000         else
2001                 m->v = m->m = 0;
2002 
2003         return m->v & m->m;
2004 }
2005 
2006 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2007 {
2008         int ret = 0;
2009 
2010         if (m->m | m->v)
2011                 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2012         return ret;
2013 }
2014 
2015 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2016                                     unsigned int family)
2017 {
2018         bool tunnel = false;
2019 
2020         switch(family) {
2021         case AF_INET:
2022                 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2023                         tunnel = true;
2024                 break;
2025         case AF_INET6:
2026                 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2027                         tunnel = true;
2028                 break;
2029         }
2030         if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
2031                 return -EINVAL;
2032 
2033         return 0;
2034 }
2035 #endif  /* _NET_XFRM_H */
2036 

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