~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.3 ] ~ [ linux-5.2.14 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.72 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.143 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.192 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.192 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.73 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

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

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp