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

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