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

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  1 #ifndef _NET_XFRM_H
  2 #define _NET_XFRM_H
  3 
  4 #include <linux/compiler.h>
  5 #include <linux/xfrm.h>
  6 #include <linux/spinlock.h>
  7 #include <linux/list.h>
  8 #include <linux/skbuff.h>
  9 #include <linux/socket.h>
 10 #include <linux/pfkeyv2.h>
 11 #include <linux/ipsec.h>
 12 #include <linux/in6.h>
 13 #include <linux/mutex.h>
 14 #include <linux/audit.h>
 15 #include <linux/slab.h>
 16 
 17 #include <net/sock.h>
 18 #include <net/dst.h>
 19 #include <net/ip.h>
 20 #include <net/route.h>
 21 #include <net/ipv6.h>
 22 #include <net/ip6_fib.h>
 23 #include <net/flow.h>
 24 
 25 #include <linux/interrupt.h>
 26 
 27 #ifdef CONFIG_XFRM_STATISTICS
 28 #include <net/snmp.h>
 29 #endif
 30 
 31 #define XFRM_PROTO_ESP          50
 32 #define XFRM_PROTO_AH           51
 33 #define XFRM_PROTO_COMP         108
 34 #define XFRM_PROTO_IPIP         4
 35 #define XFRM_PROTO_IPV6         41
 36 #define XFRM_PROTO_ROUTING      IPPROTO_ROUTING
 37 #define XFRM_PROTO_DSTOPTS      IPPROTO_DSTOPTS
 38 
 39 #define XFRM_ALIGN4(len)        (((len) + 3) & ~3)
 40 #define XFRM_ALIGN8(len)        (((len) + 7) & ~7)
 41 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
 42         MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
 43 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
 44         MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
 45 
 46 #ifdef CONFIG_XFRM_STATISTICS
 47 #define XFRM_INC_STATS(net, field)      SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
 48 #define XFRM_INC_STATS_BH(net, field)   SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
 49 #define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
 50 #else
 51 #define XFRM_INC_STATS(net, field)      ((void)(net))
 52 #define XFRM_INC_STATS_BH(net, field)   ((void)(net))
 53 #define XFRM_INC_STATS_USER(net, field) ((void)(net))
 54 #endif
 55 
 56 extern struct mutex xfrm_cfg_mutex;
 57 
 58 /* Organization of SPD aka "XFRM rules"
 59    ------------------------------------
 60 
 61    Basic objects:
 62    - policy rule, struct xfrm_policy (=SPD entry)
 63    - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
 64    - instance of a transformer, struct xfrm_state (=SA)
 65    - template to clone xfrm_state, struct xfrm_tmpl
 66 
 67    SPD is plain linear list of xfrm_policy rules, ordered by priority.
 68    (To be compatible with existing pfkeyv2 implementations,
 69    many rules with priority of 0x7fffffff are allowed to exist and
 70    such rules are ordered in an unpredictable way, thanks to bsd folks.)
 71 
 72    Lookup is plain linear search until the first match with selector.
 73 
 74    If "action" is "block", then we prohibit the flow, otherwise:
 75    if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
 76    policy entry has list of up to XFRM_MAX_DEPTH transformations,
 77    described by templates xfrm_tmpl. Each template is resolved
 78    to a complete xfrm_state (see below) and we pack bundle of transformations
 79    to a dst_entry returned to requestor.
 80 
 81    dst -. xfrm  .-> xfrm_state #1
 82     |---. child .-> dst -. xfrm .-> xfrm_state #2
 83                      |---. child .-> dst -. xfrm .-> xfrm_state #3
 84                                       |---. child .-> NULL
 85 
 86    Bundles are cached at xrfm_policy struct (field ->bundles).
 87 
 88 
 89    Resolution of xrfm_tmpl
 90    -----------------------
 91    Template contains:
 92    1. ->mode            Mode: transport or tunnel
 93    2. ->id.proto        Protocol: AH/ESP/IPCOMP
 94    3. ->id.daddr        Remote tunnel endpoint, ignored for transport mode.
 95       Q: allow to resolve security gateway?
 96    4. ->id.spi          If not zero, static SPI.
 97    5. ->saddr           Local tunnel endpoint, ignored for transport mode.
 98    6. ->algos           List of allowed algos. Plain bitmask now.
 99       Q: ealgos, aalgos, calgos. What a mess...
100    7. ->share           Sharing mode.
101       Q: how to implement private sharing mode? To add struct sock* to
102       flow id?
103 
104    Having this template we search through SAD searching for entries
105    with appropriate mode/proto/algo, permitted by selector.
106    If no appropriate entry found, it is requested from key manager.
107 
108    PROBLEMS:
109    Q: How to find all the bundles referring to a physical path for
110       PMTU discovery? Seems, dst should contain list of all parents...
111       and enter to infinite locking hierarchy disaster.
112       No! It is easier, we will not search for them, let them find us.
113       We add genid to each dst plus pointer to genid of raw IP route,
114       pmtu disc will update pmtu on raw IP route and increase its genid.
115       dst_check() will see this for top level and trigger resyncing
116       metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
117  */
118 
119 struct xfrm_state_walk {
120         struct list_head        all;
121         u8                      state;
122         union {
123                 u8              dying;
124                 u8              proto;
125         };
126         u32                     seq;
127 };
128 
129 /* Full description of state of transformer. */
130 struct xfrm_state {
131 #ifdef CONFIG_NET_NS
132         struct net              *xs_net;
133 #endif
134         union {
135                 struct hlist_node       gclist;
136                 struct hlist_node       bydst;
137         };
138         struct hlist_node       bysrc;
139         struct hlist_node       byspi;
140 
141         atomic_t                refcnt;
142         spinlock_t              lock;
143 
144         struct xfrm_id          id;
145         struct xfrm_selector    sel;
146         struct xfrm_mark        mark;
147         u32                     tfcpad;
148 
149         u32                     genid;
150 
151         /* Key manager bits */
152         struct xfrm_state_walk  km;
153 
154         /* Parameters of this state. */
155         struct {
156                 u32             reqid;
157                 u8              mode;
158                 u8              replay_window;
159                 u8              aalgo, ealgo, calgo;
160                 u8              flags;
161                 u16             family;
162                 xfrm_address_t  saddr;
163                 int             header_len;
164                 int             trailer_len;
165                 u32             extra_flags;
166         } props;
167 
168         struct xfrm_lifetime_cfg lft;
169 
170         /* Data for transformer */
171         struct xfrm_algo_auth   *aalg;
172         struct xfrm_algo        *ealg;
173         struct xfrm_algo        *calg;
174         struct xfrm_algo_aead   *aead;
175 
176         /* Data for encapsulator */
177         struct xfrm_encap_tmpl  *encap;
178 
179         /* Data for care-of address */
180         xfrm_address_t  *coaddr;
181 
182         /* IPComp needs an IPIP tunnel for handling uncompressed packets */
183         struct xfrm_state       *tunnel;
184 
185         /* If a tunnel, number of users + 1 */
186         atomic_t                tunnel_users;
187 
188         /* State for replay detection */
189         struct xfrm_replay_state replay;
190         struct xfrm_replay_state_esn *replay_esn;
191 
192         /* Replay detection state at the time we sent the last notification */
193         struct xfrm_replay_state preplay;
194         struct xfrm_replay_state_esn *preplay_esn;
195 
196         /* The functions for replay detection. */
197         struct xfrm_replay      *repl;
198 
199         /* internal flag that only holds state for delayed aevent at the
200          * moment
201         */
202         u32                     xflags;
203 
204         /* Replay detection notification settings */
205         u32                     replay_maxage;
206         u32                     replay_maxdiff;
207 
208         /* Replay detection notification timer */
209         struct timer_list       rtimer;
210 
211         /* Statistics */
212         struct xfrm_stats       stats;
213 
214         struct xfrm_lifetime_cur curlft;
215         struct tasklet_hrtimer  mtimer;
216 
217         /* used to fix curlft->add_time when changing date */
218         long            saved_tmo;
219 
220         /* Last used time */
221         unsigned long           lastused;
222 
223         /* Reference to data common to all the instances of this
224          * transformer. */
225         const struct xfrm_type  *type;
226         struct xfrm_mode        *inner_mode;
227         struct xfrm_mode        *inner_mode_iaf;
228         struct xfrm_mode        *outer_mode;
229 
230         /* Security context */
231         struct xfrm_sec_ctx     *security;
232 
233         /* Private data of this transformer, format is opaque,
234          * interpreted by xfrm_type methods. */
235         void                    *data;
236 };
237 
238 static inline struct net *xs_net(struct xfrm_state *x)
239 {
240         return read_pnet(&x->xs_net);
241 }
242 
243 /* xflags - make enum if more show up */
244 #define XFRM_TIME_DEFER 1
245 #define XFRM_SOFT_EXPIRE 2
246 
247 enum {
248         XFRM_STATE_VOID,
249         XFRM_STATE_ACQ,
250         XFRM_STATE_VALID,
251         XFRM_STATE_ERROR,
252         XFRM_STATE_EXPIRED,
253         XFRM_STATE_DEAD
254 };
255 
256 /* callback structure passed from either netlink or pfkey */
257 struct km_event {
258         union {
259                 u32 hard;
260                 u32 proto;
261                 u32 byid;
262                 u32 aevent;
263                 u32 type;
264         } data;
265 
266         u32     seq;
267         u32     portid;
268         u32     event;
269         struct net *net;
270 };
271 
272 struct xfrm_replay {
273         void    (*advance)(struct xfrm_state *x, __be32 net_seq);
274         int     (*check)(struct xfrm_state *x,
275                          struct sk_buff *skb,
276                          __be32 net_seq);
277         int     (*recheck)(struct xfrm_state *x,
278                            struct sk_buff *skb,
279                            __be32 net_seq);
280         void    (*notify)(struct xfrm_state *x, int event);
281         int     (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
282 };
283 
284 struct net_device;
285 struct xfrm_type;
286 struct xfrm_dst;
287 struct xfrm_policy_afinfo {
288         unsigned short          family;
289         struct dst_ops          *dst_ops;
290         void                    (*garbage_collect)(struct net *net);
291         struct dst_entry        *(*dst_lookup)(struct net *net, int tos,
292                                                const xfrm_address_t *saddr,
293                                                const xfrm_address_t *daddr);
294         int                     (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
295         void                    (*decode_session)(struct sk_buff *skb,
296                                                   struct flowi *fl,
297                                                   int reverse);
298         int                     (*get_tos)(const struct flowi *fl);
299         void                    (*init_dst)(struct net *net,
300                                             struct xfrm_dst *dst);
301         int                     (*init_path)(struct xfrm_dst *path,
302                                              struct dst_entry *dst,
303                                              int nfheader_len);
304         int                     (*fill_dst)(struct xfrm_dst *xdst,
305                                             struct net_device *dev,
306                                             const struct flowi *fl);
307         struct dst_entry        *(*blackhole_route)(struct net *net, struct dst_entry *orig);
308 };
309 
310 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
311 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
312 extern void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c);
313 extern void km_state_notify(struct xfrm_state *x, const struct km_event *c);
314 
315 struct xfrm_tmpl;
316 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
317 extern void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
318 extern int __xfrm_state_delete(struct xfrm_state *x);
319 
320 struct xfrm_state_afinfo {
321         unsigned int            family;
322         unsigned int            proto;
323         __be16                  eth_proto;
324         struct module           *owner;
325         const struct xfrm_type  *type_map[IPPROTO_MAX];
326         struct xfrm_mode        *mode_map[XFRM_MODE_MAX];
327         int                     (*init_flags)(struct xfrm_state *x);
328         void                    (*init_tempsel)(struct xfrm_selector *sel,
329                                                 const struct flowi *fl);
330         void                    (*init_temprop)(struct xfrm_state *x,
331                                                 const struct xfrm_tmpl *tmpl,
332                                                 const xfrm_address_t *daddr,
333                                                 const xfrm_address_t *saddr);
334         int                     (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
335         int                     (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
336         int                     (*output)(struct sk_buff *skb);
337         int                     (*output_finish)(struct sk_buff *skb);
338         int                     (*extract_input)(struct xfrm_state *x,
339                                                  struct sk_buff *skb);
340         int                     (*extract_output)(struct xfrm_state *x,
341                                                   struct sk_buff *skb);
342         int                     (*transport_finish)(struct sk_buff *skb,
343                                                     int async);
344         void                    (*local_error)(struct sk_buff *skb, u32 mtu);
345 };
346 
347 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
348 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
349 extern struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
350 extern void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
351 
352 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
353 
354 struct xfrm_type {
355         char                    *description;
356         struct module           *owner;
357         u8                      proto;
358         u8                      flags;
359 #define XFRM_TYPE_NON_FRAGMENT  1
360 #define XFRM_TYPE_REPLAY_PROT   2
361 #define XFRM_TYPE_LOCAL_COADDR  4
362 #define XFRM_TYPE_REMOTE_COADDR 8
363 
364         int                     (*init_state)(struct xfrm_state *x);
365         void                    (*destructor)(struct xfrm_state *);
366         int                     (*input)(struct xfrm_state *, struct sk_buff *skb);
367         int                     (*output)(struct xfrm_state *, struct sk_buff *pskb);
368         int                     (*reject)(struct xfrm_state *, struct sk_buff *,
369                                           const struct flowi *);
370         int                     (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
371         /* Estimate maximal size of result of transformation of a dgram */
372         u32                     (*get_mtu)(struct xfrm_state *, int size);
373 };
374 
375 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
376 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
377 
378 struct xfrm_mode {
379         /*
380          * Remove encapsulation header.
381          *
382          * The IP header will be moved over the top of the encapsulation
383          * header.
384          *
385          * On entry, the transport header shall point to where the IP header
386          * should be and the network header shall be set to where the IP
387          * header currently is.  skb->data shall point to the start of the
388          * payload.
389          */
390         int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
391 
392         /*
393          * This is the actual input entry point.
394          *
395          * For transport mode and equivalent this would be identical to
396          * input2 (which does not need to be set).  While tunnel mode
397          * and equivalent would set this to the tunnel encapsulation function
398          * xfrm4_prepare_input that would in turn call input2.
399          */
400         int (*input)(struct xfrm_state *x, struct sk_buff *skb);
401 
402         /*
403          * Add encapsulation header.
404          *
405          * On exit, the transport header will be set to the start of the
406          * encapsulation header to be filled in by x->type->output and
407          * the mac header will be set to the nextheader (protocol for
408          * IPv4) field of the extension header directly preceding the
409          * encapsulation header, or in its absence, that of the top IP
410          * header.  The value of the network header will always point
411          * to the top IP header while skb->data will point to the payload.
412          */
413         int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
414 
415         /*
416          * This is the actual output entry point.
417          *
418          * For transport mode and equivalent this would be identical to
419          * output2 (which does not need to be set).  While tunnel mode
420          * and equivalent would set this to a tunnel encapsulation function
421          * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
422          * call output2.
423          */
424         int (*output)(struct xfrm_state *x, struct sk_buff *skb);
425 
426         struct xfrm_state_afinfo *afinfo;
427         struct module *owner;
428         unsigned int encap;
429         int flags;
430 };
431 
432 /* Flags for xfrm_mode. */
433 enum {
434         XFRM_MODE_FLAG_TUNNEL = 1,
435 };
436 
437 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
438 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
439 
440 static inline int xfrm_af2proto(unsigned int family)
441 {
442         switch(family) {
443         case AF_INET:
444                 return IPPROTO_IPIP;
445         case AF_INET6:
446                 return IPPROTO_IPV6;
447         default:
448                 return 0;
449         }
450 }
451 
452 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
453 {
454         if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
455             (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
456                 return x->inner_mode;
457         else
458                 return x->inner_mode_iaf;
459 }
460 
461 struct xfrm_tmpl {
462 /* id in template is interpreted as:
463  * daddr - destination of tunnel, may be zero for transport mode.
464  * spi   - zero to acquire spi. Not zero if spi is static, then
465  *         daddr must be fixed too.
466  * proto - AH/ESP/IPCOMP
467  */
468         struct xfrm_id          id;
469 
470 /* Source address of tunnel. Ignored, if it is not a tunnel. */
471         xfrm_address_t          saddr;
472 
473         unsigned short          encap_family;
474 
475         u32                     reqid;
476 
477 /* Mode: transport, tunnel etc. */
478         u8                      mode;
479 
480 /* Sharing mode: unique, this session only, this user only etc. */
481         u8                      share;
482 
483 /* May skip this transfomration if no SA is found */
484         u8                      optional;
485 
486 /* Skip aalgos/ealgos/calgos checks. */
487         u8                      allalgs;
488 
489 /* Bit mask of algos allowed for acquisition */
490         u32                     aalgos;
491         u32                     ealgos;
492         u32                     calgos;
493 };
494 
495 #define XFRM_MAX_DEPTH          6
496 
497 struct xfrm_policy_walk_entry {
498         struct list_head        all;
499         u8                      dead;
500 };
501 
502 struct xfrm_policy_walk {
503         struct xfrm_policy_walk_entry walk;
504         u8 type;
505         u32 seq;
506 };
507 
508 struct xfrm_policy_queue {
509         struct sk_buff_head     hold_queue;
510         struct timer_list       hold_timer;
511         unsigned long           timeout;
512 };
513 
514 struct xfrm_policy {
515 #ifdef CONFIG_NET_NS
516         struct net              *xp_net;
517 #endif
518         struct hlist_node       bydst;
519         struct hlist_node       byidx;
520 
521         /* This lock only affects elements except for entry. */
522         rwlock_t                lock;
523         atomic_t                refcnt;
524         struct timer_list       timer;
525 
526         struct flow_cache_object flo;
527         atomic_t                genid;
528         u32                     priority;
529         u32                     index;
530         struct xfrm_mark        mark;
531         struct xfrm_selector    selector;
532         struct xfrm_lifetime_cfg lft;
533         struct xfrm_lifetime_cur curlft;
534         struct xfrm_policy_walk_entry walk;
535         struct xfrm_policy_queue polq;
536         u8                      type;
537         u8                      action;
538         u8                      flags;
539         u8                      xfrm_nr;
540         u16                     family;
541         struct xfrm_sec_ctx     *security;
542         struct xfrm_tmpl        xfrm_vec[XFRM_MAX_DEPTH];
543 };
544 
545 static inline struct net *xp_net(const struct xfrm_policy *xp)
546 {
547         return read_pnet(&xp->xp_net);
548 }
549 
550 struct xfrm_kmaddress {
551         xfrm_address_t          local;
552         xfrm_address_t          remote;
553         u32                     reserved;
554         u16                     family;
555 };
556 
557 struct xfrm_migrate {
558         xfrm_address_t          old_daddr;
559         xfrm_address_t          old_saddr;
560         xfrm_address_t          new_daddr;
561         xfrm_address_t          new_saddr;
562         u8                      proto;
563         u8                      mode;
564         u16                     reserved;
565         u32                     reqid;
566         u16                     old_family;
567         u16                     new_family;
568 };
569 
570 #define XFRM_KM_TIMEOUT                30
571 /* what happened */
572 #define XFRM_REPLAY_UPDATE      XFRM_AE_CR
573 #define XFRM_REPLAY_TIMEOUT     XFRM_AE_CE
574 
575 /* default aevent timeout in units of 100ms */
576 #define XFRM_AE_ETIME                   10
577 /* Async Event timer multiplier */
578 #define XFRM_AE_ETH_M                   10
579 /* default seq threshold size */
580 #define XFRM_AE_SEQT_SIZE               2
581 
582 struct xfrm_mgr {
583         struct list_head        list;
584         char                    *id;
585         int                     (*notify)(struct xfrm_state *x, const struct km_event *c);
586         int                     (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
587         struct xfrm_policy      *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
588         int                     (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
589         int                     (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
590         int                     (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
591         int                     (*migrate)(const struct xfrm_selector *sel,
592                                            u8 dir, u8 type,
593                                            const struct xfrm_migrate *m,
594                                            int num_bundles,
595                                            const struct xfrm_kmaddress *k);
596 };
597 
598 extern int xfrm_register_km(struct xfrm_mgr *km);
599 extern int xfrm_unregister_km(struct xfrm_mgr *km);
600 
601 /*
602  * This structure is used for the duration where packets are being
603  * transformed by IPsec.  As soon as the packet leaves IPsec the
604  * area beyond the generic IP part may be overwritten.
605  */
606 struct xfrm_skb_cb {
607         union {
608                 struct inet_skb_parm h4;
609                 struct inet6_skb_parm h6;
610         } header;
611 
612         /* Sequence number for replay protection. */
613         union {
614                 struct {
615                         __u32 low;
616                         __u32 hi;
617                 } output;
618                 struct {
619                         __be32 low;
620                         __be32 hi;
621                 } input;
622         } seq;
623 };
624 
625 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
626 
627 /*
628  * This structure is used by the afinfo prepare_input/prepare_output functions
629  * to transmit header information to the mode input/output functions.
630  */
631 struct xfrm_mode_skb_cb {
632         union {
633                 struct inet_skb_parm h4;
634                 struct inet6_skb_parm h6;
635         } header;
636 
637         /* Copied from header for IPv4, always set to zero and DF for IPv6. */
638         __be16 id;
639         __be16 frag_off;
640 
641         /* IP header length (excluding options or extension headers). */
642         u8 ihl;
643 
644         /* TOS for IPv4, class for IPv6. */
645         u8 tos;
646 
647         /* TTL for IPv4, hop limitfor IPv6. */
648         u8 ttl;
649 
650         /* Protocol for IPv4, NH for IPv6. */
651         u8 protocol;
652 
653         /* Option length for IPv4, zero for IPv6. */
654         u8 optlen;
655 
656         /* Used by IPv6 only, zero for IPv4. */
657         u8 flow_lbl[3];
658 };
659 
660 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
661 
662 /*
663  * This structure is used by the input processing to locate the SPI and
664  * related information.
665  */
666 struct xfrm_spi_skb_cb {
667         union {
668                 struct inet_skb_parm h4;
669                 struct inet6_skb_parm h6;
670         } header;
671 
672         unsigned int daddroff;
673         unsigned int family;
674 };
675 
676 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
677 
678 /* Audit Information */
679 struct xfrm_audit {
680         u32     secid;
681         kuid_t  loginuid;
682         u32     sessionid;
683 };
684 
685 #ifdef CONFIG_AUDITSYSCALL
686 static inline struct audit_buffer *xfrm_audit_start(const char *op)
687 {
688         struct audit_buffer *audit_buf = NULL;
689 
690         if (audit_enabled == 0)
691                 return NULL;
692         audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
693                                     AUDIT_MAC_IPSEC_EVENT);
694         if (audit_buf == NULL)
695                 return NULL;
696         audit_log_format(audit_buf, "op=%s", op);
697         return audit_buf;
698 }
699 
700 static inline void xfrm_audit_helper_usrinfo(kuid_t auid, u32 ses, u32 secid,
701                                              struct audit_buffer *audit_buf)
702 {
703         char *secctx;
704         u32 secctx_len;
705 
706         audit_log_format(audit_buf, " auid=%u ses=%u",
707                          from_kuid(&init_user_ns, auid), ses);
708         if (secid != 0 &&
709             security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
710                 audit_log_format(audit_buf, " subj=%s", secctx);
711                 security_release_secctx(secctx, secctx_len);
712         } else
713                 audit_log_task_context(audit_buf);
714 }
715 
716 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
717                                   kuid_t auid, u32 ses, u32 secid);
718 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
719                                   kuid_t auid, u32 ses, u32 secid);
720 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
721                                  kuid_t auid, u32 ses, u32 secid);
722 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
723                                     kuid_t auid, u32 ses, u32 secid);
724 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
725                                              struct sk_buff *skb);
726 extern void xfrm_audit_state_replay(struct xfrm_state *x,
727                                     struct sk_buff *skb, __be32 net_seq);
728 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
729 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
730                                       __be32 net_spi, __be32 net_seq);
731 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
732                                      struct sk_buff *skb, u8 proto);
733 #else
734 
735 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
736                                   kuid_t auid, u32 ses, u32 secid)
737 {
738 }
739 
740 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
741                                   kuid_t auid, u32 ses, u32 secid)
742 {
743 }
744 
745 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
746                                  kuid_t auid, u32 ses, u32 secid)
747 {
748 }
749 
750 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
751                                     kuid_t auid, u32 ses, u32 secid)
752 {
753 }
754 
755 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
756                                              struct sk_buff *skb)
757 {
758 }
759 
760 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
761                                            struct sk_buff *skb, __be32 net_seq)
762 {
763 }
764 
765 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
766                                       u16 family)
767 {
768 }
769 
770 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
771                                       __be32 net_spi, __be32 net_seq)
772 {
773 }
774 
775 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
776                                      struct sk_buff *skb, u8 proto)
777 {
778 }
779 #endif /* CONFIG_AUDITSYSCALL */
780 
781 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
782 {
783         if (likely(policy != NULL))
784                 atomic_inc(&policy->refcnt);
785 }
786 
787 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
788 
789 static inline void xfrm_pol_put(struct xfrm_policy *policy)
790 {
791         if (atomic_dec_and_test(&policy->refcnt))
792                 xfrm_policy_destroy(policy);
793 }
794 
795 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
796 {
797         int i;
798         for (i = npols - 1; i >= 0; --i)
799                 xfrm_pol_put(pols[i]);
800 }
801 
802 extern void __xfrm_state_destroy(struct xfrm_state *);
803 
804 static inline void __xfrm_state_put(struct xfrm_state *x)
805 {
806         atomic_dec(&x->refcnt);
807 }
808 
809 static inline void xfrm_state_put(struct xfrm_state *x)
810 {
811         if (atomic_dec_and_test(&x->refcnt))
812                 __xfrm_state_destroy(x);
813 }
814 
815 static inline void xfrm_state_hold(struct xfrm_state *x)
816 {
817         atomic_inc(&x->refcnt);
818 }
819 
820 static inline bool addr_match(const void *token1, const void *token2,
821                               int prefixlen)
822 {
823         const __be32 *a1 = token1;
824         const __be32 *a2 = token2;
825         int pdw;
826         int pbi;
827 
828         pdw = prefixlen >> 5;     /* num of whole u32 in prefix */
829         pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
830 
831         if (pdw)
832                 if (memcmp(a1, a2, pdw << 2))
833                         return false;
834 
835         if (pbi) {
836                 __be32 mask;
837 
838                 mask = htonl((0xffffffff) << (32 - pbi));
839 
840                 if ((a1[pdw] ^ a2[pdw]) & mask)
841                         return false;
842         }
843 
844         return true;
845 }
846 
847 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
848 {
849         /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
850         if (prefixlen == 0)
851                 return true;
852         return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen)));
853 }
854 
855 static __inline__
856 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
857 {
858         __be16 port;
859         switch(fl->flowi_proto) {
860         case IPPROTO_TCP:
861         case IPPROTO_UDP:
862         case IPPROTO_UDPLITE:
863         case IPPROTO_SCTP:
864                 port = uli->ports.sport;
865                 break;
866         case IPPROTO_ICMP:
867         case IPPROTO_ICMPV6:
868                 port = htons(uli->icmpt.type);
869                 break;
870         case IPPROTO_MH:
871                 port = htons(uli->mht.type);
872                 break;
873         case IPPROTO_GRE:
874                 port = htons(ntohl(uli->gre_key) >> 16);
875                 break;
876         default:
877                 port = 0;       /*XXX*/
878         }
879         return port;
880 }
881 
882 static __inline__
883 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
884 {
885         __be16 port;
886         switch(fl->flowi_proto) {
887         case IPPROTO_TCP:
888         case IPPROTO_UDP:
889         case IPPROTO_UDPLITE:
890         case IPPROTO_SCTP:
891                 port = uli->ports.dport;
892                 break;
893         case IPPROTO_ICMP:
894         case IPPROTO_ICMPV6:
895                 port = htons(uli->icmpt.code);
896                 break;
897         case IPPROTO_GRE:
898                 port = htons(ntohl(uli->gre_key) & 0xffff);
899                 break;
900         default:
901                 port = 0;       /*XXX*/
902         }
903         return port;
904 }
905 
906 extern bool xfrm_selector_match(const struct xfrm_selector *sel,
907                                 const struct flowi *fl,
908                                 unsigned short family);
909 
910 #ifdef CONFIG_SECURITY_NETWORK_XFRM
911 /*      If neither has a context --> match
912  *      Otherwise, both must have a context and the sids, doi, alg must match
913  */
914 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
915 {
916         return ((!s1 && !s2) ||
917                 (s1 && s2 &&
918                  (s1->ctx_sid == s2->ctx_sid) &&
919                  (s1->ctx_doi == s2->ctx_doi) &&
920                  (s1->ctx_alg == s2->ctx_alg)));
921 }
922 #else
923 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
924 {
925         return true;
926 }
927 #endif
928 
929 /* A struct encoding bundle of transformations to apply to some set of flow.
930  *
931  * dst->child points to the next element of bundle.
932  * dst->xfrm  points to an instanse of transformer.
933  *
934  * Due to unfortunate limitations of current routing cache, which we
935  * have no time to fix, it mirrors struct rtable and bound to the same
936  * routing key, including saddr,daddr. However, we can have many of
937  * bundles differing by session id. All the bundles grow from a parent
938  * policy rule.
939  */
940 struct xfrm_dst {
941         union {
942                 struct dst_entry        dst;
943                 struct rtable           rt;
944                 struct rt6_info         rt6;
945         } u;
946         struct dst_entry *route;
947         struct flow_cache_object flo;
948         struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
949         int num_pols, num_xfrms;
950 #ifdef CONFIG_XFRM_SUB_POLICY
951         struct flowi *origin;
952         struct xfrm_selector *partner;
953 #endif
954         u32 xfrm_genid;
955         u32 policy_genid;
956         u32 route_mtu_cached;
957         u32 child_mtu_cached;
958         u32 route_cookie;
959         u32 path_cookie;
960 };
961 
962 #ifdef CONFIG_XFRM
963 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
964 {
965         xfrm_pols_put(xdst->pols, xdst->num_pols);
966         dst_release(xdst->route);
967         if (likely(xdst->u.dst.xfrm))
968                 xfrm_state_put(xdst->u.dst.xfrm);
969 #ifdef CONFIG_XFRM_SUB_POLICY
970         kfree(xdst->origin);
971         xdst->origin = NULL;
972         kfree(xdst->partner);
973         xdst->partner = NULL;
974 #endif
975 }
976 #endif
977 
978 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
979 
980 struct sec_path {
981         atomic_t                refcnt;
982         int                     len;
983         struct xfrm_state       *xvec[XFRM_MAX_DEPTH];
984 };
985 
986 static inline int secpath_exists(struct sk_buff *skb)
987 {
988 #ifdef CONFIG_XFRM
989         return skb->sp != NULL;
990 #else
991         return 0;
992 #endif
993 }
994 
995 static inline struct sec_path *
996 secpath_get(struct sec_path *sp)
997 {
998         if (sp)
999                 atomic_inc(&sp->refcnt);
1000         return sp;
1001 }
1002 
1003 extern void __secpath_destroy(struct sec_path *sp);
1004 
1005 static inline void
1006 secpath_put(struct sec_path *sp)
1007 {
1008         if (sp && atomic_dec_and_test(&sp->refcnt))
1009                 __secpath_destroy(sp);
1010 }
1011 
1012 extern struct sec_path *secpath_dup(struct sec_path *src);
1013 
1014 static inline void
1015 secpath_reset(struct sk_buff *skb)
1016 {
1017 #ifdef CONFIG_XFRM
1018         secpath_put(skb->sp);
1019         skb->sp = NULL;
1020 #endif
1021 }
1022 
1023 static inline int
1024 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1025 {
1026         switch (family) {
1027         case AF_INET:
1028                 return addr->a4 == 0;
1029         case AF_INET6:
1030                 return ipv6_addr_any((struct in6_addr *)&addr->a6);
1031         }
1032         return 0;
1033 }
1034 
1035 static inline int
1036 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1037 {
1038         return  (tmpl->saddr.a4 &&
1039                  tmpl->saddr.a4 != x->props.saddr.a4);
1040 }
1041 
1042 static inline int
1043 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1044 {
1045         return  (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1046                  !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1047 }
1048 
1049 static inline int
1050 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1051 {
1052         switch (family) {
1053         case AF_INET:
1054                 return __xfrm4_state_addr_cmp(tmpl, x);
1055         case AF_INET6:
1056                 return __xfrm6_state_addr_cmp(tmpl, x);
1057         }
1058         return !0;
1059 }
1060 
1061 #ifdef CONFIG_XFRM
1062 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
1063 
1064 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1065                                        struct sk_buff *skb,
1066                                        unsigned int family, int reverse)
1067 {
1068         struct net *net = dev_net(skb->dev);
1069         int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1070 
1071         if (sk && sk->sk_policy[XFRM_POLICY_IN])
1072                 return __xfrm_policy_check(sk, ndir, skb, family);
1073 
1074         return  (!net->xfrm.policy_count[dir] && !skb->sp) ||
1075                 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1076                 __xfrm_policy_check(sk, ndir, skb, family);
1077 }
1078 
1079 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1080 {
1081         return __xfrm_policy_check2(sk, dir, skb, family, 0);
1082 }
1083 
1084 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1085 {
1086         return xfrm_policy_check(sk, dir, skb, AF_INET);
1087 }
1088 
1089 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1090 {
1091         return xfrm_policy_check(sk, dir, skb, AF_INET6);
1092 }
1093 
1094 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1095                                              struct sk_buff *skb)
1096 {
1097         return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1098 }
1099 
1100 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1101                                              struct sk_buff *skb)
1102 {
1103         return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1104 }
1105 
1106 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1107                                  unsigned int family, int reverse);
1108 
1109 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1110                                       unsigned int family)
1111 {
1112         return __xfrm_decode_session(skb, fl, family, 0);
1113 }
1114 
1115 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1116                                               struct flowi *fl,
1117                                               unsigned int family)
1118 {
1119         return __xfrm_decode_session(skb, fl, family, 1);
1120 }
1121 
1122 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1123 
1124 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1125 {
1126         struct net *net = dev_net(skb->dev);
1127 
1128         return  !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1129                 (skb_dst(skb)->flags & DST_NOXFRM) ||
1130                 __xfrm_route_forward(skb, family);
1131 }
1132 
1133 static inline int xfrm4_route_forward(struct sk_buff *skb)
1134 {
1135         return xfrm_route_forward(skb, AF_INET);
1136 }
1137 
1138 static inline int xfrm6_route_forward(struct sk_buff *skb)
1139 {
1140         return xfrm_route_forward(skb, AF_INET6);
1141 }
1142 
1143 extern int __xfrm_sk_clone_policy(struct sock *sk);
1144 
1145 static inline int xfrm_sk_clone_policy(struct sock *sk)
1146 {
1147         if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1148                 return __xfrm_sk_clone_policy(sk);
1149         return 0;
1150 }
1151 
1152 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1153 
1154 static inline void xfrm_sk_free_policy(struct sock *sk)
1155 {
1156         if (unlikely(sk->sk_policy[0] != NULL)) {
1157                 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1158                 sk->sk_policy[0] = NULL;
1159         }
1160         if (unlikely(sk->sk_policy[1] != NULL)) {
1161                 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1162                 sk->sk_policy[1] = NULL;
1163         }
1164 }
1165 
1166 extern void xfrm_garbage_collect(struct net *net);
1167 
1168 #else
1169 
1170 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1171 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1172 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }  
1173 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 
1174 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1175 { 
1176         return 1; 
1177 } 
1178 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1179 {
1180         return 1;
1181 }
1182 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1183 {
1184         return 1;
1185 }
1186 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1187                                               struct flowi *fl,
1188                                               unsigned int family)
1189 {
1190         return -ENOSYS;
1191 }
1192 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1193                                              struct sk_buff *skb)
1194 {
1195         return 1;
1196 }
1197 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1198                                              struct sk_buff *skb)
1199 {
1200         return 1;
1201 }
1202 static inline void xfrm_garbage_collect(struct net *net)
1203 {
1204 }
1205 #endif
1206 
1207 static __inline__
1208 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1209 {
1210         switch (family){
1211         case AF_INET:
1212                 return (xfrm_address_t *)&fl->u.ip4.daddr;
1213         case AF_INET6:
1214                 return (xfrm_address_t *)&fl->u.ip6.daddr;
1215         }
1216         return NULL;
1217 }
1218 
1219 static __inline__
1220 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1221 {
1222         switch (family){
1223         case AF_INET:
1224                 return (xfrm_address_t *)&fl->u.ip4.saddr;
1225         case AF_INET6:
1226                 return (xfrm_address_t *)&fl->u.ip6.saddr;
1227         }
1228         return NULL;
1229 }
1230 
1231 static __inline__
1232 void xfrm_flowi_addr_get(const struct flowi *fl,
1233                          xfrm_address_t *saddr, xfrm_address_t *daddr,
1234                          unsigned short family)
1235 {
1236         switch(family) {
1237         case AF_INET:
1238                 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1239                 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1240                 break;
1241         case AF_INET6:
1242                 *(struct in6_addr *)saddr->a6 = fl->u.ip6.saddr;
1243                 *(struct in6_addr *)daddr->a6 = fl->u.ip6.daddr;
1244                 break;
1245         }
1246 }
1247 
1248 static __inline__ int
1249 __xfrm4_state_addr_check(const struct xfrm_state *x,
1250                          const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1251 {
1252         if (daddr->a4 == x->id.daddr.a4 &&
1253             (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1254                 return 1;
1255         return 0;
1256 }
1257 
1258 static __inline__ int
1259 __xfrm6_state_addr_check(const struct xfrm_state *x,
1260                          const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1261 {
1262         if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1263             (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1264              ipv6_addr_any((struct in6_addr *)saddr) || 
1265              ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1266                 return 1;
1267         return 0;
1268 }
1269 
1270 static __inline__ int
1271 xfrm_state_addr_check(const struct xfrm_state *x,
1272                       const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1273                       unsigned short family)
1274 {
1275         switch (family) {
1276         case AF_INET:
1277                 return __xfrm4_state_addr_check(x, daddr, saddr);
1278         case AF_INET6:
1279                 return __xfrm6_state_addr_check(x, daddr, saddr);
1280         }
1281         return 0;
1282 }
1283 
1284 static __inline__ int
1285 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1286                            unsigned short family)
1287 {
1288         switch (family) {
1289         case AF_INET:
1290                 return __xfrm4_state_addr_check(x,
1291                                                 (const xfrm_address_t *)&fl->u.ip4.daddr,
1292                                                 (const xfrm_address_t *)&fl->u.ip4.saddr);
1293         case AF_INET6:
1294                 return __xfrm6_state_addr_check(x,
1295                                                 (const xfrm_address_t *)&fl->u.ip6.daddr,
1296                                                 (const xfrm_address_t *)&fl->u.ip6.saddr);
1297         }
1298         return 0;
1299 }
1300 
1301 static inline int xfrm_state_kern(const struct xfrm_state *x)
1302 {
1303         return atomic_read(&x->tunnel_users);
1304 }
1305 
1306 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1307 {
1308         return (!userproto || proto == userproto ||
1309                 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1310                                                   proto == IPPROTO_ESP ||
1311                                                   proto == IPPROTO_COMP)));
1312 }
1313 
1314 /*
1315  * xfrm algorithm information
1316  */
1317 struct xfrm_algo_aead_info {
1318         u16 icv_truncbits;
1319 };
1320 
1321 struct xfrm_algo_auth_info {
1322         u16 icv_truncbits;
1323         u16 icv_fullbits;
1324 };
1325 
1326 struct xfrm_algo_encr_info {
1327         u16 blockbits;
1328         u16 defkeybits;
1329 };
1330 
1331 struct xfrm_algo_comp_info {
1332         u16 threshold;
1333 };
1334 
1335 struct xfrm_algo_desc {
1336         char *name;
1337         char *compat;
1338         u8 available:1;
1339         u8 pfkey_supported:1;
1340         union {
1341                 struct xfrm_algo_aead_info aead;
1342                 struct xfrm_algo_auth_info auth;
1343                 struct xfrm_algo_encr_info encr;
1344                 struct xfrm_algo_comp_info comp;
1345         } uinfo;
1346         struct sadb_alg desc;
1347 };
1348 
1349 /* XFRM tunnel handlers.  */
1350 struct xfrm_tunnel {
1351         int (*handler)(struct sk_buff *skb);
1352         int (*err_handler)(struct sk_buff *skb, u32 info);
1353 
1354         struct xfrm_tunnel __rcu *next;
1355         int priority;
1356 };
1357 
1358 struct xfrm6_tunnel {
1359         int (*handler)(struct sk_buff *skb);
1360         int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1361                            u8 type, u8 code, int offset, __be32 info);
1362         struct xfrm6_tunnel __rcu *next;
1363         int priority;
1364 };
1365 
1366 extern void xfrm_init(void);
1367 extern void xfrm4_init(void);
1368 extern int xfrm_state_init(struct net *net);
1369 extern void xfrm_state_fini(struct net *net);
1370 extern void xfrm4_state_init(void);
1371 #ifdef CONFIG_XFRM
1372 extern int xfrm6_init(void);
1373 extern void xfrm6_fini(void);
1374 extern int xfrm6_state_init(void);
1375 extern void xfrm6_state_fini(void);
1376 #else
1377 static inline int xfrm6_init(void)
1378 {
1379         return 0;
1380 }
1381 static inline void xfrm6_fini(void)
1382 {
1383         ;
1384 }
1385 #endif
1386 
1387 #ifdef CONFIG_XFRM_STATISTICS
1388 extern int xfrm_proc_init(struct net *net);
1389 extern void xfrm_proc_fini(struct net *net);
1390 #endif
1391 
1392 extern int xfrm_sysctl_init(struct net *net);
1393 #ifdef CONFIG_SYSCTL
1394 extern void xfrm_sysctl_fini(struct net *net);
1395 #else
1396 static inline void xfrm_sysctl_fini(struct net *net)
1397 {
1398 }
1399 #endif
1400 
1401 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1402 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1403                            int (*func)(struct xfrm_state *, int, void*), void *);
1404 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1405 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1406 extern struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1407                                           const xfrm_address_t *saddr,
1408                                           const struct flowi *fl,
1409                                           struct xfrm_tmpl *tmpl,
1410                                           struct xfrm_policy *pol, int *err,
1411                                           unsigned short family);
1412 extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1413                                                xfrm_address_t *daddr,
1414                                                xfrm_address_t *saddr,
1415                                                unsigned short family,
1416                                                u8 mode, u8 proto, u32 reqid);
1417 extern int xfrm_state_check_expire(struct xfrm_state *x);
1418 extern void xfrm_state_insert(struct xfrm_state *x);
1419 extern int xfrm_state_add(struct xfrm_state *x);
1420 extern int xfrm_state_update(struct xfrm_state *x);
1421 extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1422                                             const xfrm_address_t *daddr, __be32 spi,
1423                                             u8 proto, unsigned short family);
1424 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1425                                                    const xfrm_address_t *daddr,
1426                                                    const xfrm_address_t *saddr,
1427                                                    u8 proto,
1428                                                    unsigned short family);
1429 #ifdef CONFIG_XFRM_SUB_POLICY
1430 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1431                           int n, unsigned short family);
1432 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1433                            int n, unsigned short family);
1434 #else
1435 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1436                                  int n, unsigned short family)
1437 {
1438         return -ENOSYS;
1439 }
1440 
1441 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1442                                   int n, unsigned short family)
1443 {
1444         return -ENOSYS;
1445 }
1446 #endif
1447 
1448 struct xfrmk_sadinfo {
1449         u32 sadhcnt; /* current hash bkts */
1450         u32 sadhmcnt; /* max allowed hash bkts */
1451         u32 sadcnt; /* current running count */
1452 };
1453 
1454 struct xfrmk_spdinfo {
1455         u32 incnt;
1456         u32 outcnt;
1457         u32 fwdcnt;
1458         u32 inscnt;
1459         u32 outscnt;
1460         u32 fwdscnt;
1461         u32 spdhcnt;
1462         u32 spdhmcnt;
1463 };
1464 
1465 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark,
1466                                               u32 seq);
1467 extern int xfrm_state_delete(struct xfrm_state *x);
1468 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1469 extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1470 extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1471 extern u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1472 extern int xfrm_init_replay(struct xfrm_state *x);
1473 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1474 extern int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1475 extern int xfrm_init_state(struct xfrm_state *x);
1476 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1477 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1478                       int encap_type);
1479 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1480 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1481 extern int xfrm_output(struct sk_buff *skb);
1482 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1483 extern void xfrm_local_error(struct sk_buff *skb, int mtu);
1484 extern int xfrm4_extract_header(struct sk_buff *skb);
1485 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1486 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1487                            int encap_type);
1488 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1489 extern int xfrm4_rcv(struct sk_buff *skb);
1490 
1491 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1492 {
1493         return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1494 }
1495 
1496 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1497 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1498 extern int xfrm4_output(struct sk_buff *skb);
1499 extern int xfrm4_output_finish(struct sk_buff *skb);
1500 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1501 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1502 extern int xfrm4_mode_tunnel_input_register(struct xfrm_tunnel *handler);
1503 extern int xfrm4_mode_tunnel_input_deregister(struct xfrm_tunnel *handler);
1504 extern void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1505 extern int xfrm6_extract_header(struct sk_buff *skb);
1506 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1507 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1508 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1509 extern int xfrm6_rcv(struct sk_buff *skb);
1510 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1511                             xfrm_address_t *saddr, u8 proto);
1512 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1513 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1514 extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1515 extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1516 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1517 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1518 extern int xfrm6_output(struct sk_buff *skb);
1519 extern int xfrm6_output_finish(struct sk_buff *skb);
1520 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1521                                  u8 **prevhdr);
1522 extern void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1523 
1524 #ifdef CONFIG_XFRM
1525 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1526 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1527 #else
1528 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1529 {
1530         return -ENOPROTOOPT;
1531 } 
1532 
1533 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1534 {
1535         /* should not happen */
1536         kfree_skb(skb);
1537         return 0;
1538 }
1539 #endif
1540 
1541 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1542 
1543 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1544 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1545         int (*func)(struct xfrm_policy *, int, int, void*), void *);
1546 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1547 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1548 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1549                                           u8 type, int dir,
1550                                           struct xfrm_selector *sel,
1551                                           struct xfrm_sec_ctx *ctx, int delete,
1552                                           int *err);
1553 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err);
1554 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1555 u32 xfrm_get_acqseq(void);
1556 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1557 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1558                                  u8 mode, u32 reqid, u8 proto,
1559                                  const xfrm_address_t *daddr,
1560                                  const xfrm_address_t *saddr, int create,
1561                                  unsigned short family);
1562 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1563 
1564 #ifdef CONFIG_XFRM_MIGRATE
1565 extern int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1566                       const struct xfrm_migrate *m, int num_bundles,
1567                       const struct xfrm_kmaddress *k);
1568 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1569 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1570                                               struct xfrm_migrate *m);
1571 extern int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1572                         struct xfrm_migrate *m, int num_bundles,
1573                         struct xfrm_kmaddress *k);
1574 #endif
1575 
1576 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1577 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1578 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1579 
1580 extern void xfrm_input_init(void);
1581 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1582 
1583 extern void xfrm_probe_algs(void);
1584 extern int xfrm_count_pfkey_auth_supported(void);
1585 extern int xfrm_count_pfkey_enc_supported(void);
1586 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1587 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1588 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1589 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1590 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1591 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1592 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1593 extern struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1594 extern struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1595                                                    int probe);
1596 
1597 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1598                                     const xfrm_address_t *b)
1599 {
1600         return ipv6_addr_equal((const struct in6_addr *)a,
1601                                (const struct in6_addr *)b);
1602 }
1603 
1604 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1605                                    const xfrm_address_t *b,
1606                                    sa_family_t family)
1607 {
1608         switch (family) {
1609         default:
1610         case AF_INET:
1611                 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1612         case AF_INET6:
1613                 return xfrm6_addr_equal(a, b);
1614         }
1615 }
1616 
1617 static inline int xfrm_policy_id2dir(u32 index)
1618 {
1619         return index & 7;
1620 }
1621 
1622 #ifdef CONFIG_XFRM
1623 static inline int xfrm_aevent_is_on(struct net *net)
1624 {
1625         struct sock *nlsk;
1626         int ret = 0;
1627 
1628         rcu_read_lock();
1629         nlsk = rcu_dereference(net->xfrm.nlsk);
1630         if (nlsk)
1631                 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1632         rcu_read_unlock();
1633         return ret;
1634 }
1635 #endif
1636 
1637 static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1638 {
1639         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1640 }
1641 
1642 static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1643 {
1644         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1645 }
1646 
1647 static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1648 {
1649         return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1650 }
1651 
1652 #ifdef CONFIG_XFRM_MIGRATE
1653 static inline int xfrm_replay_clone(struct xfrm_state *x,
1654                                      struct xfrm_state *orig)
1655 {
1656         x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1657                                 GFP_KERNEL);
1658         if (!x->replay_esn)
1659                 return -ENOMEM;
1660 
1661         x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1662         x->replay_esn->replay_window = orig->replay_esn->replay_window;
1663 
1664         x->preplay_esn = kmemdup(x->replay_esn,
1665                                  xfrm_replay_state_esn_len(x->replay_esn),
1666                                  GFP_KERNEL);
1667         if (!x->preplay_esn) {
1668                 kfree(x->replay_esn);
1669                 return -ENOMEM;
1670         }
1671 
1672         return 0;
1673 }
1674 
1675 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1676 {
1677         return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1678 }
1679 
1680 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1681 {
1682         return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1683 }
1684 
1685 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1686 {
1687         int i;
1688         for (i = 0; i < n; i++)
1689                 xfrm_state_put(*(states + i));
1690 }
1691 
1692 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1693 {
1694         int i;
1695         for (i = 0; i < n; i++)
1696                 xfrm_state_delete(*(states + i));
1697 }
1698 #endif
1699 
1700 #ifdef CONFIG_XFRM
1701 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1702 {
1703         return skb->sp->xvec[skb->sp->len - 1];
1704 }
1705 #endif
1706 
1707 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1708 {
1709         if (attrs[XFRMA_MARK])
1710                 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1711         else
1712                 m->v = m->m = 0;
1713 
1714         return m->v & m->m;
1715 }
1716 
1717 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1718 {
1719         int ret = 0;
1720 
1721         if (m->m | m->v)
1722                 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1723         return ret;
1724 }
1725 
1726 #endif  /* _NET_XFRM_H */
1727 

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