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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 };
345 
346 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
347 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
348 
349 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
350 
351 struct xfrm_type {
352         char                    *description;
353         struct module           *owner;
354         u8                      proto;
355         u8                      flags;
356 #define XFRM_TYPE_NON_FRAGMENT  1
357 #define XFRM_TYPE_REPLAY_PROT   2
358 #define XFRM_TYPE_LOCAL_COADDR  4
359 #define XFRM_TYPE_REMOTE_COADDR 8
360 
361         int                     (*init_state)(struct xfrm_state *x);
362         void                    (*destructor)(struct xfrm_state *);
363         int                     (*input)(struct xfrm_state *, struct sk_buff *skb);
364         int                     (*output)(struct xfrm_state *, struct sk_buff *pskb);
365         int                     (*reject)(struct xfrm_state *, struct sk_buff *,
366                                           const struct flowi *);
367         int                     (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
368         /* Estimate maximal size of result of transformation of a dgram */
369         u32                     (*get_mtu)(struct xfrm_state *, int size);
370 };
371 
372 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
373 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
374 
375 struct xfrm_mode {
376         /*
377          * Remove encapsulation header.
378          *
379          * The IP header will be moved over the top of the encapsulation
380          * header.
381          *
382          * On entry, the transport header shall point to where the IP header
383          * should be and the network header shall be set to where the IP
384          * header currently is.  skb->data shall point to the start of the
385          * payload.
386          */
387         int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
388 
389         /*
390          * This is the actual input entry point.
391          *
392          * For transport mode and equivalent this would be identical to
393          * input2 (which does not need to be set).  While tunnel mode
394          * and equivalent would set this to the tunnel encapsulation function
395          * xfrm4_prepare_input that would in turn call input2.
396          */
397         int (*input)(struct xfrm_state *x, struct sk_buff *skb);
398 
399         /*
400          * Add encapsulation header.
401          *
402          * On exit, the transport header will be set to the start of the
403          * encapsulation header to be filled in by x->type->output and
404          * the mac header will be set to the nextheader (protocol for
405          * IPv4) field of the extension header directly preceding the
406          * encapsulation header, or in its absence, that of the top IP
407          * header.  The value of the network header will always point
408          * to the top IP header while skb->data will point to the payload.
409          */
410         int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
411 
412         /*
413          * This is the actual output entry point.
414          *
415          * For transport mode and equivalent this would be identical to
416          * output2 (which does not need to be set).  While tunnel mode
417          * and equivalent would set this to a tunnel encapsulation function
418          * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
419          * call output2.
420          */
421         int (*output)(struct xfrm_state *x, struct sk_buff *skb);
422 
423         struct xfrm_state_afinfo *afinfo;
424         struct module *owner;
425         unsigned int encap;
426         int flags;
427 };
428 
429 /* Flags for xfrm_mode. */
430 enum {
431         XFRM_MODE_FLAG_TUNNEL = 1,
432 };
433 
434 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
435 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
436 
437 static inline int xfrm_af2proto(unsigned int family)
438 {
439         switch(family) {
440         case AF_INET:
441                 return IPPROTO_IPIP;
442         case AF_INET6:
443                 return IPPROTO_IPV6;
444         default:
445                 return 0;
446         }
447 }
448 
449 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
450 {
451         if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
452             (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
453                 return x->inner_mode;
454         else
455                 return x->inner_mode_iaf;
456 }
457 
458 struct xfrm_tmpl {
459 /* id in template is interpreted as:
460  * daddr - destination of tunnel, may be zero for transport mode.
461  * spi   - zero to acquire spi. Not zero if spi is static, then
462  *         daddr must be fixed too.
463  * proto - AH/ESP/IPCOMP
464  */
465         struct xfrm_id          id;
466 
467 /* Source address of tunnel. Ignored, if it is not a tunnel. */
468         xfrm_address_t          saddr;
469 
470         unsigned short          encap_family;
471 
472         u32                     reqid;
473 
474 /* Mode: transport, tunnel etc. */
475         u8                      mode;
476 
477 /* Sharing mode: unique, this session only, this user only etc. */
478         u8                      share;
479 
480 /* May skip this transfomration if no SA is found */
481         u8                      optional;
482 
483 /* Skip aalgos/ealgos/calgos checks. */
484         u8                      allalgs;
485 
486 /* Bit mask of algos allowed for acquisition */
487         u32                     aalgos;
488         u32                     ealgos;
489         u32                     calgos;
490 };
491 
492 #define XFRM_MAX_DEPTH          6
493 
494 struct xfrm_policy_walk_entry {
495         struct list_head        all;
496         u8                      dead;
497 };
498 
499 struct xfrm_policy_walk {
500         struct xfrm_policy_walk_entry walk;
501         u8 type;
502         u32 seq;
503 };
504 
505 struct xfrm_policy_queue {
506         struct sk_buff_head     hold_queue;
507         struct timer_list       hold_timer;
508         unsigned long           timeout;
509 };
510 
511 struct xfrm_policy {
512 #ifdef CONFIG_NET_NS
513         struct net              *xp_net;
514 #endif
515         struct hlist_node       bydst;
516         struct hlist_node       byidx;
517 
518         /* This lock only affects elements except for entry. */
519         rwlock_t                lock;
520         atomic_t                refcnt;
521         struct timer_list       timer;
522 
523         struct flow_cache_object flo;
524         atomic_t                genid;
525         u32                     priority;
526         u32                     index;
527         struct xfrm_mark        mark;
528         struct xfrm_selector    selector;
529         struct xfrm_lifetime_cfg lft;
530         struct xfrm_lifetime_cur curlft;
531         struct xfrm_policy_walk_entry walk;
532         struct xfrm_policy_queue polq;
533         u8                      type;
534         u8                      action;
535         u8                      flags;
536         u8                      xfrm_nr;
537         u16                     family;
538         struct xfrm_sec_ctx     *security;
539         struct xfrm_tmpl        xfrm_vec[XFRM_MAX_DEPTH];
540 };
541 
542 static inline struct net *xp_net(const struct xfrm_policy *xp)
543 {
544         return read_pnet(&xp->xp_net);
545 }
546 
547 struct xfrm_kmaddress {
548         xfrm_address_t          local;
549         xfrm_address_t          remote;
550         u32                     reserved;
551         u16                     family;
552 };
553 
554 struct xfrm_migrate {
555         xfrm_address_t          old_daddr;
556         xfrm_address_t          old_saddr;
557         xfrm_address_t          new_daddr;
558         xfrm_address_t          new_saddr;
559         u8                      proto;
560         u8                      mode;
561         u16                     reserved;
562         u32                     reqid;
563         u16                     old_family;
564         u16                     new_family;
565 };
566 
567 #define XFRM_KM_TIMEOUT                30
568 /* what happened */
569 #define XFRM_REPLAY_UPDATE      XFRM_AE_CR
570 #define XFRM_REPLAY_TIMEOUT     XFRM_AE_CE
571 
572 /* default aevent timeout in units of 100ms */
573 #define XFRM_AE_ETIME                   10
574 /* Async Event timer multiplier */
575 #define XFRM_AE_ETH_M                   10
576 /* default seq threshold size */
577 #define XFRM_AE_SEQT_SIZE               2
578 
579 struct xfrm_mgr {
580         struct list_head        list;
581         char                    *id;
582         int                     (*notify)(struct xfrm_state *x, const struct km_event *c);
583         int                     (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
584         struct xfrm_policy      *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
585         int                     (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
586         int                     (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
587         int                     (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
588         int                     (*migrate)(const struct xfrm_selector *sel,
589                                            u8 dir, u8 type,
590                                            const struct xfrm_migrate *m,
591                                            int num_bundles,
592                                            const struct xfrm_kmaddress *k);
593 };
594 
595 extern int xfrm_register_km(struct xfrm_mgr *km);
596 extern int xfrm_unregister_km(struct xfrm_mgr *km);
597 
598 /*
599  * This structure is used for the duration where packets are being
600  * transformed by IPsec.  As soon as the packet leaves IPsec the
601  * area beyond the generic IP part may be overwritten.
602  */
603 struct xfrm_skb_cb {
604         union {
605                 struct inet_skb_parm h4;
606                 struct inet6_skb_parm h6;
607         } header;
608 
609         /* Sequence number for replay protection. */
610         union {
611                 struct {
612                         __u32 low;
613                         __u32 hi;
614                 } output;
615                 struct {
616                         __be32 low;
617                         __be32 hi;
618                 } input;
619         } seq;
620 };
621 
622 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
623 
624 /*
625  * This structure is used by the afinfo prepare_input/prepare_output functions
626  * to transmit header information to the mode input/output functions.
627  */
628 struct xfrm_mode_skb_cb {
629         union {
630                 struct inet_skb_parm h4;
631                 struct inet6_skb_parm h6;
632         } header;
633 
634         /* Copied from header for IPv4, always set to zero and DF for IPv6. */
635         __be16 id;
636         __be16 frag_off;
637 
638         /* IP header length (excluding options or extension headers). */
639         u8 ihl;
640 
641         /* TOS for IPv4, class for IPv6. */
642         u8 tos;
643 
644         /* TTL for IPv4, hop limitfor IPv6. */
645         u8 ttl;
646 
647         /* Protocol for IPv4, NH for IPv6. */
648         u8 protocol;
649 
650         /* Option length for IPv4, zero for IPv6. */
651         u8 optlen;
652 
653         /* Used by IPv6 only, zero for IPv4. */
654         u8 flow_lbl[3];
655 };
656 
657 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
658 
659 /*
660  * This structure is used by the input processing to locate the SPI and
661  * related information.
662  */
663 struct xfrm_spi_skb_cb {
664         union {
665                 struct inet_skb_parm h4;
666                 struct inet6_skb_parm h6;
667         } header;
668 
669         unsigned int daddroff;
670         unsigned int family;
671 };
672 
673 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
674 
675 /* Audit Information */
676 struct xfrm_audit {
677         u32     secid;
678         kuid_t  loginuid;
679         u32     sessionid;
680 };
681 
682 #ifdef CONFIG_AUDITSYSCALL
683 static inline struct audit_buffer *xfrm_audit_start(const char *op)
684 {
685         struct audit_buffer *audit_buf = NULL;
686 
687         if (audit_enabled == 0)
688                 return NULL;
689         audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
690                                     AUDIT_MAC_IPSEC_EVENT);
691         if (audit_buf == NULL)
692                 return NULL;
693         audit_log_format(audit_buf, "op=%s", op);
694         return audit_buf;
695 }
696 
697 static inline void xfrm_audit_helper_usrinfo(kuid_t auid, u32 ses, u32 secid,
698                                              struct audit_buffer *audit_buf)
699 {
700         char *secctx;
701         u32 secctx_len;
702 
703         audit_log_format(audit_buf, " auid=%u ses=%u",
704                          from_kuid(&init_user_ns, auid), ses);
705         if (secid != 0 &&
706             security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
707                 audit_log_format(audit_buf, " subj=%s", secctx);
708                 security_release_secctx(secctx, secctx_len);
709         } else
710                 audit_log_task_context(audit_buf);
711 }
712 
713 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
714                                   kuid_t auid, u32 ses, u32 secid);
715 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
716                                   kuid_t auid, u32 ses, u32 secid);
717 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
718                                  kuid_t auid, u32 ses, u32 secid);
719 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
720                                     kuid_t auid, u32 ses, u32 secid);
721 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
722                                              struct sk_buff *skb);
723 extern void xfrm_audit_state_replay(struct xfrm_state *x,
724                                     struct sk_buff *skb, __be32 net_seq);
725 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
726 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
727                                       __be32 net_spi, __be32 net_seq);
728 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
729                                      struct sk_buff *skb, u8 proto);
730 #else
731 
732 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
733                                   kuid_t auid, u32 ses, u32 secid)
734 {
735 }
736 
737 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
738                                   kuid_t auid, u32 ses, u32 secid)
739 {
740 }
741 
742 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
743                                  kuid_t auid, u32 ses, u32 secid)
744 {
745 }
746 
747 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
748                                     kuid_t auid, u32 ses, u32 secid)
749 {
750 }
751 
752 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
753                                              struct sk_buff *skb)
754 {
755 }
756 
757 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
758                                            struct sk_buff *skb, __be32 net_seq)
759 {
760 }
761 
762 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
763                                       u16 family)
764 {
765 }
766 
767 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
768                                       __be32 net_spi, __be32 net_seq)
769 {
770 }
771 
772 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
773                                      struct sk_buff *skb, u8 proto)
774 {
775 }
776 #endif /* CONFIG_AUDITSYSCALL */
777 
778 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
779 {
780         if (likely(policy != NULL))
781                 atomic_inc(&policy->refcnt);
782 }
783 
784 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
785 
786 static inline void xfrm_pol_put(struct xfrm_policy *policy)
787 {
788         if (atomic_dec_and_test(&policy->refcnt))
789                 xfrm_policy_destroy(policy);
790 }
791 
792 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
793 {
794         int i;
795         for (i = npols - 1; i >= 0; --i)
796                 xfrm_pol_put(pols[i]);
797 }
798 
799 extern void __xfrm_state_destroy(struct xfrm_state *);
800 
801 static inline void __xfrm_state_put(struct xfrm_state *x)
802 {
803         atomic_dec(&x->refcnt);
804 }
805 
806 static inline void xfrm_state_put(struct xfrm_state *x)
807 {
808         if (atomic_dec_and_test(&x->refcnt))
809                 __xfrm_state_destroy(x);
810 }
811 
812 static inline void xfrm_state_hold(struct xfrm_state *x)
813 {
814         atomic_inc(&x->refcnt);
815 }
816 
817 static inline bool addr_match(const void *token1, const void *token2,
818                               int prefixlen)
819 {
820         const __be32 *a1 = token1;
821         const __be32 *a2 = token2;
822         int pdw;
823         int pbi;
824 
825         pdw = prefixlen >> 5;     /* num of whole u32 in prefix */
826         pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
827 
828         if (pdw)
829                 if (memcmp(a1, a2, pdw << 2))
830                         return false;
831 
832         if (pbi) {
833                 __be32 mask;
834 
835                 mask = htonl((0xffffffff) << (32 - pbi));
836 
837                 if ((a1[pdw] ^ a2[pdw]) & mask)
838                         return false;
839         }
840 
841         return true;
842 }
843 
844 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
845 {
846         /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
847         if (prefixlen == 0)
848                 return true;
849         return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen)));
850 }
851 
852 static __inline__
853 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
854 {
855         __be16 port;
856         switch(fl->flowi_proto) {
857         case IPPROTO_TCP:
858         case IPPROTO_UDP:
859         case IPPROTO_UDPLITE:
860         case IPPROTO_SCTP:
861                 port = uli->ports.sport;
862                 break;
863         case IPPROTO_ICMP:
864         case IPPROTO_ICMPV6:
865                 port = htons(uli->icmpt.type);
866                 break;
867         case IPPROTO_MH:
868                 port = htons(uli->mht.type);
869                 break;
870         case IPPROTO_GRE:
871                 port = htons(ntohl(uli->gre_key) >> 16);
872                 break;
873         default:
874                 port = 0;       /*XXX*/
875         }
876         return port;
877 }
878 
879 static __inline__
880 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
881 {
882         __be16 port;
883         switch(fl->flowi_proto) {
884         case IPPROTO_TCP:
885         case IPPROTO_UDP:
886         case IPPROTO_UDPLITE:
887         case IPPROTO_SCTP:
888                 port = uli->ports.dport;
889                 break;
890         case IPPROTO_ICMP:
891         case IPPROTO_ICMPV6:
892                 port = htons(uli->icmpt.code);
893                 break;
894         case IPPROTO_GRE:
895                 port = htons(ntohl(uli->gre_key) & 0xffff);
896                 break;
897         default:
898                 port = 0;       /*XXX*/
899         }
900         return port;
901 }
902 
903 extern bool xfrm_selector_match(const struct xfrm_selector *sel,
904                                 const struct flowi *fl,
905                                 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 extern 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 extern 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 extern 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((struct in6_addr *)&addr->a6);
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 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
1060 
1061 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1062                                        struct sk_buff *skb,
1063                                        unsigned int family, int reverse)
1064 {
1065         struct net *net = dev_net(skb->dev);
1066         int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1067 
1068         if (sk && sk->sk_policy[XFRM_POLICY_IN])
1069                 return __xfrm_policy_check(sk, ndir, skb, family);
1070 
1071         return  (!net->xfrm.policy_count[dir] && !skb->sp) ||
1072                 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1073                 __xfrm_policy_check(sk, ndir, skb, family);
1074 }
1075 
1076 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1077 {
1078         return __xfrm_policy_check2(sk, dir, skb, family, 0);
1079 }
1080 
1081 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1082 {
1083         return xfrm_policy_check(sk, dir, skb, AF_INET);
1084 }
1085 
1086 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1087 {
1088         return xfrm_policy_check(sk, dir, skb, AF_INET6);
1089 }
1090 
1091 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1092                                              struct sk_buff *skb)
1093 {
1094         return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1095 }
1096 
1097 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1098                                              struct sk_buff *skb)
1099 {
1100         return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1101 }
1102 
1103 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1104                                  unsigned int family, int reverse);
1105 
1106 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1107                                       unsigned int family)
1108 {
1109         return __xfrm_decode_session(skb, fl, family, 0);
1110 }
1111 
1112 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1113                                               struct flowi *fl,
1114                                               unsigned int family)
1115 {
1116         return __xfrm_decode_session(skb, fl, family, 1);
1117 }
1118 
1119 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1120 
1121 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1122 {
1123         struct net *net = dev_net(skb->dev);
1124 
1125         return  !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1126                 (skb_dst(skb)->flags & DST_NOXFRM) ||
1127                 __xfrm_route_forward(skb, family);
1128 }
1129 
1130 static inline int xfrm4_route_forward(struct sk_buff *skb)
1131 {
1132         return xfrm_route_forward(skb, AF_INET);
1133 }
1134 
1135 static inline int xfrm6_route_forward(struct sk_buff *skb)
1136 {
1137         return xfrm_route_forward(skb, AF_INET6);
1138 }
1139 
1140 extern int __xfrm_sk_clone_policy(struct sock *sk);
1141 
1142 static inline int xfrm_sk_clone_policy(struct sock *sk)
1143 {
1144         if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1145                 return __xfrm_sk_clone_policy(sk);
1146         return 0;
1147 }
1148 
1149 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1150 
1151 static inline void xfrm_sk_free_policy(struct sock *sk)
1152 {
1153         if (unlikely(sk->sk_policy[0] != NULL)) {
1154                 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1155                 sk->sk_policy[0] = NULL;
1156         }
1157         if (unlikely(sk->sk_policy[1] != NULL)) {
1158                 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1159                 sk->sk_policy[1] = NULL;
1160         }
1161 }
1162 
1163 extern void xfrm_garbage_collect(struct net *net);
1164 
1165 #else
1166 
1167 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1168 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1169 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }  
1170 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 
1171 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1172 { 
1173         return 1; 
1174 } 
1175 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1176 {
1177         return 1;
1178 }
1179 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1180 {
1181         return 1;
1182 }
1183 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1184                                               struct flowi *fl,
1185                                               unsigned int family)
1186 {
1187         return -ENOSYS;
1188 }
1189 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1190                                              struct sk_buff *skb)
1191 {
1192         return 1;
1193 }
1194 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1195                                              struct sk_buff *skb)
1196 {
1197         return 1;
1198 }
1199 static inline void xfrm_garbage_collect(struct net *net)
1200 {
1201 }
1202 #endif
1203 
1204 static __inline__
1205 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1206 {
1207         switch (family){
1208         case AF_INET:
1209                 return (xfrm_address_t *)&fl->u.ip4.daddr;
1210         case AF_INET6:
1211                 return (xfrm_address_t *)&fl->u.ip6.daddr;
1212         }
1213         return NULL;
1214 }
1215 
1216 static __inline__
1217 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1218 {
1219         switch (family){
1220         case AF_INET:
1221                 return (xfrm_address_t *)&fl->u.ip4.saddr;
1222         case AF_INET6:
1223                 return (xfrm_address_t *)&fl->u.ip6.saddr;
1224         }
1225         return NULL;
1226 }
1227 
1228 static __inline__
1229 void xfrm_flowi_addr_get(const struct flowi *fl,
1230                          xfrm_address_t *saddr, xfrm_address_t *daddr,
1231                          unsigned short family)
1232 {
1233         switch(family) {
1234         case AF_INET:
1235                 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1236                 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1237                 break;
1238         case AF_INET6:
1239                 *(struct in6_addr *)saddr->a6 = fl->u.ip6.saddr;
1240                 *(struct in6_addr *)daddr->a6 = fl->u.ip6.daddr;
1241                 break;
1242         }
1243 }
1244 
1245 static __inline__ int
1246 __xfrm4_state_addr_check(const struct xfrm_state *x,
1247                          const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1248 {
1249         if (daddr->a4 == x->id.daddr.a4 &&
1250             (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1251                 return 1;
1252         return 0;
1253 }
1254 
1255 static __inline__ int
1256 __xfrm6_state_addr_check(const struct xfrm_state *x,
1257                          const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1258 {
1259         if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1260             (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1261              ipv6_addr_any((struct in6_addr *)saddr) || 
1262              ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1263                 return 1;
1264         return 0;
1265 }
1266 
1267 static __inline__ int
1268 xfrm_state_addr_check(const struct xfrm_state *x,
1269                       const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1270                       unsigned short family)
1271 {
1272         switch (family) {
1273         case AF_INET:
1274                 return __xfrm4_state_addr_check(x, daddr, saddr);
1275         case AF_INET6:
1276                 return __xfrm6_state_addr_check(x, daddr, saddr);
1277         }
1278         return 0;
1279 }
1280 
1281 static __inline__ int
1282 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1283                            unsigned short family)
1284 {
1285         switch (family) {
1286         case AF_INET:
1287                 return __xfrm4_state_addr_check(x,
1288                                                 (const xfrm_address_t *)&fl->u.ip4.daddr,
1289                                                 (const xfrm_address_t *)&fl->u.ip4.saddr);
1290         case AF_INET6:
1291                 return __xfrm6_state_addr_check(x,
1292                                                 (const xfrm_address_t *)&fl->u.ip6.daddr,
1293                                                 (const xfrm_address_t *)&fl->u.ip6.saddr);
1294         }
1295         return 0;
1296 }
1297 
1298 static inline int xfrm_state_kern(const struct xfrm_state *x)
1299 {
1300         return atomic_read(&x->tunnel_users);
1301 }
1302 
1303 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1304 {
1305         return (!userproto || proto == userproto ||
1306                 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1307                                                   proto == IPPROTO_ESP ||
1308                                                   proto == IPPROTO_COMP)));
1309 }
1310 
1311 /*
1312  * xfrm algorithm information
1313  */
1314 struct xfrm_algo_aead_info {
1315         u16 icv_truncbits;
1316 };
1317 
1318 struct xfrm_algo_auth_info {
1319         u16 icv_truncbits;
1320         u16 icv_fullbits;
1321 };
1322 
1323 struct xfrm_algo_encr_info {
1324         u16 blockbits;
1325         u16 defkeybits;
1326 };
1327 
1328 struct xfrm_algo_comp_info {
1329         u16 threshold;
1330 };
1331 
1332 struct xfrm_algo_desc {
1333         char *name;
1334         char *compat;
1335         u8 available:1;
1336         u8 pfkey_supported:1;
1337         union {
1338                 struct xfrm_algo_aead_info aead;
1339                 struct xfrm_algo_auth_info auth;
1340                 struct xfrm_algo_encr_info encr;
1341                 struct xfrm_algo_comp_info comp;
1342         } uinfo;
1343         struct sadb_alg desc;
1344 };
1345 
1346 /* XFRM tunnel handlers.  */
1347 struct xfrm_tunnel {
1348         int (*handler)(struct sk_buff *skb);
1349         int (*err_handler)(struct sk_buff *skb, u32 info);
1350 
1351         struct xfrm_tunnel __rcu *next;
1352         int priority;
1353 };
1354 
1355 struct xfrm6_tunnel {
1356         int (*handler)(struct sk_buff *skb);
1357         int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1358                            u8 type, u8 code, int offset, __be32 info);
1359         struct xfrm6_tunnel __rcu *next;
1360         int priority;
1361 };
1362 
1363 extern void xfrm_init(void);
1364 extern void xfrm4_init(void);
1365 extern int xfrm_state_init(struct net *net);
1366 extern void xfrm_state_fini(struct net *net);
1367 extern void xfrm4_state_init(void);
1368 #ifdef CONFIG_XFRM
1369 extern int xfrm6_init(void);
1370 extern void xfrm6_fini(void);
1371 extern int xfrm6_state_init(void);
1372 extern void xfrm6_state_fini(void);
1373 #else
1374 static inline int xfrm6_init(void)
1375 {
1376         return 0;
1377 }
1378 static inline void xfrm6_fini(void)
1379 {
1380         ;
1381 }
1382 #endif
1383 
1384 #ifdef CONFIG_XFRM_STATISTICS
1385 extern int xfrm_proc_init(struct net *net);
1386 extern void xfrm_proc_fini(struct net *net);
1387 #endif
1388 
1389 extern int xfrm_sysctl_init(struct net *net);
1390 #ifdef CONFIG_SYSCTL
1391 extern void xfrm_sysctl_fini(struct net *net);
1392 #else
1393 static inline void xfrm_sysctl_fini(struct net *net)
1394 {
1395 }
1396 #endif
1397 
1398 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1399 extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1400                            int (*func)(struct xfrm_state *, int, void*), void *);
1401 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1402 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1403 extern struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1404                                           const xfrm_address_t *saddr,
1405                                           const struct flowi *fl,
1406                                           struct xfrm_tmpl *tmpl,
1407                                           struct xfrm_policy *pol, int *err,
1408                                           unsigned short family);
1409 extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1410                                                xfrm_address_t *daddr,
1411                                                xfrm_address_t *saddr,
1412                                                unsigned short family,
1413                                                u8 mode, u8 proto, u32 reqid);
1414 extern int xfrm_state_check_expire(struct xfrm_state *x);
1415 extern void xfrm_state_insert(struct xfrm_state *x);
1416 extern int xfrm_state_add(struct xfrm_state *x);
1417 extern int xfrm_state_update(struct xfrm_state *x);
1418 extern struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1419                                             const xfrm_address_t *daddr, __be32 spi,
1420                                             u8 proto, unsigned short family);
1421 extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1422                                                    const xfrm_address_t *daddr,
1423                                                    const xfrm_address_t *saddr,
1424                                                    u8 proto,
1425                                                    unsigned short family);
1426 #ifdef CONFIG_XFRM_SUB_POLICY
1427 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1428                           int n, unsigned short family);
1429 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1430                            int n, unsigned short family);
1431 #else
1432 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1433                                  int n, unsigned short family)
1434 {
1435         return -ENOSYS;
1436 }
1437 
1438 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1439                                   int n, unsigned short family)
1440 {
1441         return -ENOSYS;
1442 }
1443 #endif
1444 
1445 struct xfrmk_sadinfo {
1446         u32 sadhcnt; /* current hash bkts */
1447         u32 sadhmcnt; /* max allowed hash bkts */
1448         u32 sadcnt; /* current running count */
1449 };
1450 
1451 struct xfrmk_spdinfo {
1452         u32 incnt;
1453         u32 outcnt;
1454         u32 fwdcnt;
1455         u32 inscnt;
1456         u32 outscnt;
1457         u32 fwdscnt;
1458         u32 spdhcnt;
1459         u32 spdhmcnt;
1460 };
1461 
1462 extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark,
1463                                               u32 seq);
1464 extern int xfrm_state_delete(struct xfrm_state *x);
1465 extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
1466 extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1467 extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1468 extern u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1469 extern int xfrm_init_replay(struct xfrm_state *x);
1470 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1471 extern int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1472 extern int xfrm_init_state(struct xfrm_state *x);
1473 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1474 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1475                       int encap_type);
1476 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1477 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1478 extern int xfrm_output(struct sk_buff *skb);
1479 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1480 extern int xfrm4_extract_header(struct sk_buff *skb);
1481 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1482 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1483                            int encap_type);
1484 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1485 extern int xfrm4_rcv(struct sk_buff *skb);
1486 
1487 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1488 {
1489         return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1490 }
1491 
1492 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1493 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1494 extern int xfrm4_output(struct sk_buff *skb);
1495 extern int xfrm4_output_finish(struct sk_buff *skb);
1496 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1497 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1498 extern int xfrm4_mode_tunnel_input_register(struct xfrm_tunnel *handler);
1499 extern int xfrm4_mode_tunnel_input_deregister(struct xfrm_tunnel *handler);
1500 extern int xfrm6_extract_header(struct sk_buff *skb);
1501 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1502 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1503 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1504 extern int xfrm6_rcv(struct sk_buff *skb);
1505 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1506                             xfrm_address_t *saddr, u8 proto);
1507 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1508 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1509 extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1510 extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1511 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1512 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1513 extern int xfrm6_output(struct sk_buff *skb);
1514 extern int xfrm6_output_finish(struct sk_buff *skb);
1515 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1516                                  u8 **prevhdr);
1517 
1518 #ifdef CONFIG_XFRM
1519 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1520 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1521 #else
1522 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1523 {
1524         return -ENOPROTOOPT;
1525 } 
1526 
1527 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1528 {
1529         /* should not happen */
1530         kfree_skb(skb);
1531         return 0;
1532 }
1533 #endif
1534 
1535 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1536 
1537 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1538 extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1539         int (*func)(struct xfrm_policy *, int, int, void*), void *);
1540 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1541 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1542 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1543                                           u8 type, int dir,
1544                                           struct xfrm_selector *sel,
1545                                           struct xfrm_sec_ctx *ctx, int delete,
1546                                           int *err);
1547 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err);
1548 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
1549 u32 xfrm_get_acqseq(void);
1550 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1551 struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark,
1552                                  u8 mode, u32 reqid, u8 proto,
1553                                  const xfrm_address_t *daddr,
1554                                  const xfrm_address_t *saddr, int create,
1555                                  unsigned short family);
1556 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1557 
1558 #ifdef CONFIG_XFRM_MIGRATE
1559 extern int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1560                       const struct xfrm_migrate *m, int num_bundles,
1561                       const struct xfrm_kmaddress *k);
1562 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1563 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1564                                               struct xfrm_migrate *m);
1565 extern int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1566                         struct xfrm_migrate *m, int num_bundles,
1567                         struct xfrm_kmaddress *k);
1568 #endif
1569 
1570 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1571 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1572 extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1573 
1574 extern void xfrm_input_init(void);
1575 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1576 
1577 extern void xfrm_probe_algs(void);
1578 extern int xfrm_count_pfkey_auth_supported(void);
1579 extern int xfrm_count_pfkey_enc_supported(void);
1580 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1581 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1582 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1583 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1584 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1585 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1586 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1587 extern struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1588 extern struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1589                                                    int probe);
1590 
1591 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1592                                     const xfrm_address_t *b)
1593 {
1594         return ipv6_addr_equal((const struct in6_addr *)a,
1595                                (const struct in6_addr *)b);
1596 }
1597 
1598 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1599                                    const xfrm_address_t *b,
1600                                    sa_family_t family)
1601 {
1602         switch (family) {
1603         default:
1604         case AF_INET:
1605                 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1606         case AF_INET6:
1607                 return xfrm6_addr_equal(a, b);
1608         }
1609 }
1610 
1611 static inline int xfrm_policy_id2dir(u32 index)
1612 {
1613         return index & 7;
1614 }
1615 
1616 #ifdef CONFIG_XFRM
1617 static inline int xfrm_aevent_is_on(struct net *net)
1618 {
1619         struct sock *nlsk;
1620         int ret = 0;
1621 
1622         rcu_read_lock();
1623         nlsk = rcu_dereference(net->xfrm.nlsk);
1624         if (nlsk)
1625                 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1626         rcu_read_unlock();
1627         return ret;
1628 }
1629 #endif
1630 
1631 static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1632 {
1633         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1634 }
1635 
1636 static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1637 {
1638         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1639 }
1640 
1641 static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1642 {
1643         return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1644 }
1645 
1646 #ifdef CONFIG_XFRM_MIGRATE
1647 static inline int xfrm_replay_clone(struct xfrm_state *x,
1648                                      struct xfrm_state *orig)
1649 {
1650         x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1651                                 GFP_KERNEL);
1652         if (!x->replay_esn)
1653                 return -ENOMEM;
1654 
1655         x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1656         x->replay_esn->replay_window = orig->replay_esn->replay_window;
1657 
1658         x->preplay_esn = kmemdup(x->replay_esn,
1659                                  xfrm_replay_state_esn_len(x->replay_esn),
1660                                  GFP_KERNEL);
1661         if (!x->preplay_esn) {
1662                 kfree(x->replay_esn);
1663                 return -ENOMEM;
1664         }
1665 
1666         return 0;
1667 }
1668 
1669 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1670 {
1671         return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1672 }
1673 
1674 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1675 {
1676         return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1677 }
1678 
1679 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1680 {
1681         int i;
1682         for (i = 0; i < n; i++)
1683                 xfrm_state_put(*(states + i));
1684 }
1685 
1686 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1687 {
1688         int i;
1689         for (i = 0; i < n; i++)
1690                 xfrm_state_delete(*(states + i));
1691 }
1692 #endif
1693 
1694 #ifdef CONFIG_XFRM
1695 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1696 {
1697         return skb->sp->xvec[skb->sp->len - 1];
1698 }
1699 #endif
1700 
1701 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1702 {
1703         if (attrs[XFRMA_MARK])
1704                 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1705         else
1706                 m->v = m->m = 0;
1707 
1708         return m->v & m->m;
1709 }
1710 
1711 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1712 {
1713         int ret = 0;
1714 
1715         if (m->m | m->v)
1716                 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1717         return ret;
1718 }
1719 
1720 #endif  /* _NET_XFRM_H */
1721 

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