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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 #ifdef CONFIG_NET_NS
130         struct net              *xs_net;
131 #endif
132         union {
133                 struct hlist_node       gclist;
134                 struct hlist_node       bydst;
135         };
136         struct hlist_node       bysrc;
137         struct hlist_node       byspi;
138 
139         atomic_t                refcnt;
140         spinlock_t              lock;
141 
142         struct xfrm_id          id;
143         struct xfrm_selector    sel;
144         struct xfrm_mark        mark;
145         u32                     tfcpad;
146 
147         u32                     genid;
148 
149         /* Key manager bits */
150         struct xfrm_state_walk  km;
151 
152         /* Parameters of this state. */
153         struct {
154                 u32             reqid;
155                 u8              mode;
156                 u8              replay_window;
157                 u8              aalgo, ealgo, calgo;
158                 u8              flags;
159                 u16             family;
160                 xfrm_address_t  saddr;
161                 int             header_len;
162                 int             trailer_len;
163                 u32             extra_flags;
164         } props;
165 
166         struct xfrm_lifetime_cfg lft;
167 
168         /* Data for transformer */
169         struct xfrm_algo_auth   *aalg;
170         struct xfrm_algo        *ealg;
171         struct xfrm_algo        *calg;
172         struct xfrm_algo_aead   *aead;
173 
174         /* Data for encapsulator */
175         struct xfrm_encap_tmpl  *encap;
176 
177         /* Data for care-of address */
178         xfrm_address_t  *coaddr;
179 
180         /* IPComp needs an IPIP tunnel for handling uncompressed packets */
181         struct xfrm_state       *tunnel;
182 
183         /* If a tunnel, number of users + 1 */
184         atomic_t                tunnel_users;
185 
186         /* State for replay detection */
187         struct xfrm_replay_state replay;
188         struct xfrm_replay_state_esn *replay_esn;
189 
190         /* Replay detection state at the time we sent the last notification */
191         struct xfrm_replay_state preplay;
192         struct xfrm_replay_state_esn *preplay_esn;
193 
194         /* The functions for replay detection. */
195         struct xfrm_replay      *repl;
196 
197         /* internal flag that only holds state for delayed aevent at the
198          * moment
199         */
200         u32                     xflags;
201 
202         /* Replay detection notification settings */
203         u32                     replay_maxage;
204         u32                     replay_maxdiff;
205 
206         /* Replay detection notification timer */
207         struct timer_list       rtimer;
208 
209         /* Statistics */
210         struct xfrm_stats       stats;
211 
212         struct xfrm_lifetime_cur curlft;
213         struct tasklet_hrtimer  mtimer;
214 
215         /* used to fix curlft->add_time when changing date */
216         long            saved_tmo;
217 
218         /* Last used time */
219         unsigned long           lastused;
220 
221         /* Reference to data common to all the instances of this
222          * transformer. */
223         const struct xfrm_type  *type;
224         struct xfrm_mode        *inner_mode;
225         struct xfrm_mode        *inner_mode_iaf;
226         struct xfrm_mode        *outer_mode;
227 
228         /* Security context */
229         struct xfrm_sec_ctx     *security;
230 
231         /* Private data of this transformer, format is opaque,
232          * interpreted by xfrm_type methods. */
233         void                    *data;
234 };
235 
236 static inline struct net *xs_net(struct xfrm_state *x)
237 {
238         return read_pnet(&x->xs_net);
239 }
240 
241 /* xflags - make enum if more show up */
242 #define XFRM_TIME_DEFER 1
243 #define XFRM_SOFT_EXPIRE 2
244 
245 enum {
246         XFRM_STATE_VOID,
247         XFRM_STATE_ACQ,
248         XFRM_STATE_VALID,
249         XFRM_STATE_ERROR,
250         XFRM_STATE_EXPIRED,
251         XFRM_STATE_DEAD
252 };
253 
254 /* callback structure passed from either netlink or pfkey */
255 struct km_event {
256         union {
257                 u32 hard;
258                 u32 proto;
259                 u32 byid;
260                 u32 aevent;
261                 u32 type;
262         } data;
263 
264         u32     seq;
265         u32     portid;
266         u32     event;
267         struct net *net;
268 };
269 
270 struct xfrm_replay {
271         void    (*advance)(struct xfrm_state *x, __be32 net_seq);
272         int     (*check)(struct xfrm_state *x,
273                          struct sk_buff *skb,
274                          __be32 net_seq);
275         int     (*recheck)(struct xfrm_state *x,
276                            struct sk_buff *skb,
277                            __be32 net_seq);
278         void    (*notify)(struct xfrm_state *x, int event);
279         int     (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
280 };
281 
282 struct net_device;
283 struct xfrm_type;
284 struct xfrm_dst;
285 struct xfrm_policy_afinfo {
286         unsigned short          family;
287         struct dst_ops          *dst_ops;
288         void                    (*garbage_collect)(struct net *net);
289         struct dst_entry        *(*dst_lookup)(struct net *net, int tos,
290                                                const xfrm_address_t *saddr,
291                                                const xfrm_address_t *daddr);
292         int                     (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
293         void                    (*decode_session)(struct sk_buff *skb,
294                                                   struct flowi *fl,
295                                                   int reverse);
296         int                     (*get_tos)(const struct flowi *fl);
297         void                    (*init_dst)(struct net *net,
298                                             struct xfrm_dst *dst);
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 sock *sk, struct sk_buff *skb);
337         int                     (*output_finish)(struct sk_buff *skb);
338         int                     (*extract_input)(struct xfrm_state *x,
339                                                  struct sk_buff *skb);
340         int                     (*extract_output)(struct xfrm_state *x,
341                                                   struct sk_buff *skb);
342         int                     (*transport_finish)(struct sk_buff *skb,
343                                                     int async);
344         void                    (*local_error)(struct sk_buff *skb, u32 mtu);
345 };
346 
347 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 #ifdef CONFIG_NET_NS
526         struct net              *xp_net;
527 #endif
528         struct hlist_node       bydst;
529         struct hlist_node       byidx;
530 
531         /* This lock only affects elements except for entry. */
532         rwlock_t                lock;
533         atomic_t                refcnt;
534         struct timer_list       timer;
535 
536         struct flow_cache_object flo;
537         atomic_t                genid;
538         u32                     priority;
539         u32                     index;
540         struct xfrm_mark        mark;
541         struct xfrm_selector    selector;
542         struct xfrm_lifetime_cfg lft;
543         struct xfrm_lifetime_cur curlft;
544         struct xfrm_policy_walk_entry walk;
545         struct xfrm_policy_queue polq;
546         u8                      type;
547         u8                      action;
548         u8                      flags;
549         u8                      xfrm_nr;
550         u16                     family;
551         struct xfrm_sec_ctx     *security;
552         struct xfrm_tmpl        xfrm_vec[XFRM_MAX_DEPTH];
553 };
554 
555 static inline struct net *xp_net(const struct xfrm_policy *xp)
556 {
557         return read_pnet(&xp->xp_net);
558 }
559 
560 struct xfrm_kmaddress {
561         xfrm_address_t          local;
562         xfrm_address_t          remote;
563         u32                     reserved;
564         u16                     family;
565 };
566 
567 struct xfrm_migrate {
568         xfrm_address_t          old_daddr;
569         xfrm_address_t          old_saddr;
570         xfrm_address_t          new_daddr;
571         xfrm_address_t          new_saddr;
572         u8                      proto;
573         u8                      mode;
574         u16                     reserved;
575         u32                     reqid;
576         u16                     old_family;
577         u16                     new_family;
578 };
579 
580 #define XFRM_KM_TIMEOUT                30
581 /* what happened */
582 #define XFRM_REPLAY_UPDATE      XFRM_AE_CR
583 #define XFRM_REPLAY_TIMEOUT     XFRM_AE_CE
584 
585 /* default aevent timeout in units of 100ms */
586 #define XFRM_AE_ETIME                   10
587 /* Async Event timer multiplier */
588 #define XFRM_AE_ETH_M                   10
589 /* default seq threshold size */
590 #define XFRM_AE_SEQT_SIZE               2
591 
592 struct xfrm_mgr {
593         struct list_head        list;
594         char                    *id;
595         int                     (*notify)(struct xfrm_state *x, const struct km_event *c);
596         int                     (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
597         struct xfrm_policy      *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
598         int                     (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
599         int                     (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
600         int                     (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
601         int                     (*migrate)(const struct xfrm_selector *sel,
602                                            u8 dir, u8 type,
603                                            const struct xfrm_migrate *m,
604                                            int num_bundles,
605                                            const struct xfrm_kmaddress *k);
606         bool                    (*is_alive)(const struct km_event *c);
607 };
608 
609 int xfrm_register_km(struct xfrm_mgr *km);
610 int xfrm_unregister_km(struct xfrm_mgr *km);
611 
612 struct xfrm_tunnel_skb_cb {
613         union {
614                 struct inet_skb_parm h4;
615                 struct inet6_skb_parm h6;
616         } header;
617 
618         union {
619                 struct ip_tunnel *ip4;
620                 struct ip6_tnl *ip6;
621         } tunnel;
622 };
623 
624 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
625 
626 /*
627  * This structure is used for the duration where packets are being
628  * transformed by IPsec.  As soon as the packet leaves IPsec the
629  * area beyond the generic IP part may be overwritten.
630  */
631 struct xfrm_skb_cb {
632         struct xfrm_tunnel_skb_cb header;
633 
634         /* Sequence number for replay protection. */
635         union {
636                 struct {
637                         __u32 low;
638                         __u32 hi;
639                 } output;
640                 struct {
641                         __be32 low;
642                         __be32 hi;
643                 } input;
644         } seq;
645 };
646 
647 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
648 
649 /*
650  * This structure is used by the afinfo prepare_input/prepare_output functions
651  * to transmit header information to the mode input/output functions.
652  */
653 struct xfrm_mode_skb_cb {
654         struct xfrm_tunnel_skb_cb header;
655 
656         /* Copied from header for IPv4, always set to zero and DF for IPv6. */
657         __be16 id;
658         __be16 frag_off;
659 
660         /* IP header length (excluding options or extension headers). */
661         u8 ihl;
662 
663         /* TOS for IPv4, class for IPv6. */
664         u8 tos;
665 
666         /* TTL for IPv4, hop limitfor IPv6. */
667         u8 ttl;
668 
669         /* Protocol for IPv4, NH for IPv6. */
670         u8 protocol;
671 
672         /* Option length for IPv4, zero for IPv6. */
673         u8 optlen;
674 
675         /* Used by IPv6 only, zero for IPv4. */
676         u8 flow_lbl[3];
677 };
678 
679 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
680 
681 /*
682  * This structure is used by the input processing to locate the SPI and
683  * related information.
684  */
685 struct xfrm_spi_skb_cb {
686         struct xfrm_tunnel_skb_cb header;
687 
688         unsigned int daddroff;
689         unsigned int family;
690 };
691 
692 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
693 
694 #ifdef CONFIG_AUDITSYSCALL
695 static inline struct audit_buffer *xfrm_audit_start(const char *op)
696 {
697         struct audit_buffer *audit_buf = NULL;
698 
699         if (audit_enabled == 0)
700                 return NULL;
701         audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
702                                     AUDIT_MAC_IPSEC_EVENT);
703         if (audit_buf == NULL)
704                 return NULL;
705         audit_log_format(audit_buf, "op=%s", op);
706         return audit_buf;
707 }
708 
709 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
710                                              struct audit_buffer *audit_buf)
711 {
712         const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
713                                             audit_get_loginuid(current) :
714                                             INVALID_UID);
715         const unsigned int ses = task_valid ? audit_get_sessionid(current) :
716                 (unsigned int) -1;
717 
718         audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
719         audit_log_task_context(audit_buf);
720 }
721 
722 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
723 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
724                               bool task_valid);
725 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
726 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
727 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
728                                       struct sk_buff *skb);
729 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
730                              __be32 net_seq);
731 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
732 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
733                                __be32 net_seq);
734 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
735                               u8 proto);
736 #else
737 
738 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
739                                          bool task_valid)
740 {
741 }
742 
743 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
744                                             bool task_valid)
745 {
746 }
747 
748 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
749                                         bool task_valid)
750 {
751 }
752 
753 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
754                                            bool task_valid)
755 {
756 }
757 
758 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
759                                              struct sk_buff *skb)
760 {
761 }
762 
763 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
764                                            struct sk_buff *skb, __be32 net_seq)
765 {
766 }
767 
768 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
769                                       u16 family)
770 {
771 }
772 
773 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
774                                       __be32 net_spi, __be32 net_seq)
775 {
776 }
777 
778 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
779                                      struct sk_buff *skb, u8 proto)
780 {
781 }
782 #endif /* CONFIG_AUDITSYSCALL */
783 
784 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
785 {
786         if (likely(policy != NULL))
787                 atomic_inc(&policy->refcnt);
788 }
789 
790 void xfrm_policy_destroy(struct xfrm_policy *policy);
791 
792 static inline void xfrm_pol_put(struct xfrm_policy *policy)
793 {
794         if (atomic_dec_and_test(&policy->refcnt))
795                 xfrm_policy_destroy(policy);
796 }
797 
798 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
799 {
800         int i;
801         for (i = npols - 1; i >= 0; --i)
802                 xfrm_pol_put(pols[i]);
803 }
804 
805 void __xfrm_state_destroy(struct xfrm_state *);
806 
807 static inline void __xfrm_state_put(struct xfrm_state *x)
808 {
809         atomic_dec(&x->refcnt);
810 }
811 
812 static inline void xfrm_state_put(struct xfrm_state *x)
813 {
814         if (atomic_dec_and_test(&x->refcnt))
815                 __xfrm_state_destroy(x);
816 }
817 
818 static inline void xfrm_state_hold(struct xfrm_state *x)
819 {
820         atomic_inc(&x->refcnt);
821 }
822 
823 static inline bool addr_match(const void *token1, const void *token2,
824                               int prefixlen)
825 {
826         const __be32 *a1 = token1;
827         const __be32 *a2 = token2;
828         int pdw;
829         int pbi;
830 
831         pdw = prefixlen >> 5;     /* num of whole u32 in prefix */
832         pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
833 
834         if (pdw)
835                 if (memcmp(a1, a2, pdw << 2))
836                         return false;
837 
838         if (pbi) {
839                 __be32 mask;
840 
841                 mask = htonl((0xffffffff) << (32 - pbi));
842 
843                 if ((a1[pdw] ^ a2[pdw]) & mask)
844                         return false;
845         }
846 
847         return true;
848 }
849 
850 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
851 {
852         /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
853         if (prefixlen == 0)
854                 return true;
855         return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen)));
856 }
857 
858 static __inline__
859 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
860 {
861         __be16 port;
862         switch(fl->flowi_proto) {
863         case IPPROTO_TCP:
864         case IPPROTO_UDP:
865         case IPPROTO_UDPLITE:
866         case IPPROTO_SCTP:
867                 port = uli->ports.sport;
868                 break;
869         case IPPROTO_ICMP:
870         case IPPROTO_ICMPV6:
871                 port = htons(uli->icmpt.type);
872                 break;
873         case IPPROTO_MH:
874                 port = htons(uli->mht.type);
875                 break;
876         case IPPROTO_GRE:
877                 port = htons(ntohl(uli->gre_key) >> 16);
878                 break;
879         default:
880                 port = 0;       /*XXX*/
881         }
882         return port;
883 }
884 
885 static __inline__
886 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
887 {
888         __be16 port;
889         switch(fl->flowi_proto) {
890         case IPPROTO_TCP:
891         case IPPROTO_UDP:
892         case IPPROTO_UDPLITE:
893         case IPPROTO_SCTP:
894                 port = uli->ports.dport;
895                 break;
896         case IPPROTO_ICMP:
897         case IPPROTO_ICMPV6:
898                 port = htons(uli->icmpt.code);
899                 break;
900         case IPPROTO_GRE:
901                 port = htons(ntohl(uli->gre_key) & 0xffff);
902                 break;
903         default:
904                 port = 0;       /*XXX*/
905         }
906         return port;
907 }
908 
909 bool xfrm_selector_match(const struct xfrm_selector *sel,
910                          const struct flowi *fl, unsigned short family);
911 
912 #ifdef CONFIG_SECURITY_NETWORK_XFRM
913 /*      If neither has a context --> match
914  *      Otherwise, both must have a context and the sids, doi, alg must match
915  */
916 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
917 {
918         return ((!s1 && !s2) ||
919                 (s1 && s2 &&
920                  (s1->ctx_sid == s2->ctx_sid) &&
921                  (s1->ctx_doi == s2->ctx_doi) &&
922                  (s1->ctx_alg == s2->ctx_alg)));
923 }
924 #else
925 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
926 {
927         return true;
928 }
929 #endif
930 
931 /* A struct encoding bundle of transformations to apply to some set of flow.
932  *
933  * dst->child points to the next element of bundle.
934  * dst->xfrm  points to an instanse of transformer.
935  *
936  * Due to unfortunate limitations of current routing cache, which we
937  * have no time to fix, it mirrors struct rtable and bound to the same
938  * routing key, including saddr,daddr. However, we can have many of
939  * bundles differing by session id. All the bundles grow from a parent
940  * policy rule.
941  */
942 struct xfrm_dst {
943         union {
944                 struct dst_entry        dst;
945                 struct rtable           rt;
946                 struct rt6_info         rt6;
947         } u;
948         struct dst_entry *route;
949         struct flow_cache_object flo;
950         struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
951         int num_pols, num_xfrms;
952 #ifdef CONFIG_XFRM_SUB_POLICY
953         struct flowi *origin;
954         struct xfrm_selector *partner;
955 #endif
956         u32 xfrm_genid;
957         u32 policy_genid;
958         u32 route_mtu_cached;
959         u32 child_mtu_cached;
960         u32 route_cookie;
961         u32 path_cookie;
962 };
963 
964 #ifdef CONFIG_XFRM
965 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
966 {
967         xfrm_pols_put(xdst->pols, xdst->num_pols);
968         dst_release(xdst->route);
969         if (likely(xdst->u.dst.xfrm))
970                 xfrm_state_put(xdst->u.dst.xfrm);
971 #ifdef CONFIG_XFRM_SUB_POLICY
972         kfree(xdst->origin);
973         xdst->origin = NULL;
974         kfree(xdst->partner);
975         xdst->partner = NULL;
976 #endif
977 }
978 #endif
979 
980 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
981 
982 struct sec_path {
983         atomic_t                refcnt;
984         int                     len;
985         struct xfrm_state       *xvec[XFRM_MAX_DEPTH];
986 };
987 
988 static inline int secpath_exists(struct sk_buff *skb)
989 {
990 #ifdef CONFIG_XFRM
991         return skb->sp != NULL;
992 #else
993         return 0;
994 #endif
995 }
996 
997 static inline struct sec_path *
998 secpath_get(struct sec_path *sp)
999 {
1000         if (sp)
1001                 atomic_inc(&sp->refcnt);
1002         return sp;
1003 }
1004 
1005 void __secpath_destroy(struct sec_path *sp);
1006 
1007 static inline void
1008 secpath_put(struct sec_path *sp)
1009 {
1010         if (sp && atomic_dec_and_test(&sp->refcnt))
1011                 __secpath_destroy(sp);
1012 }
1013 
1014 struct sec_path *secpath_dup(struct sec_path *src);
1015 
1016 static inline void
1017 secpath_reset(struct sk_buff *skb)
1018 {
1019 #ifdef CONFIG_XFRM
1020         secpath_put(skb->sp);
1021         skb->sp = NULL;
1022 #endif
1023 }
1024 
1025 static inline int
1026 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1027 {
1028         switch (family) {
1029         case AF_INET:
1030                 return addr->a4 == 0;
1031         case AF_INET6:
1032                 return ipv6_addr_any((struct in6_addr *)&addr->a6);
1033         }
1034         return 0;
1035 }
1036 
1037 static inline int
1038 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1039 {
1040         return  (tmpl->saddr.a4 &&
1041                  tmpl->saddr.a4 != x->props.saddr.a4);
1042 }
1043 
1044 static inline int
1045 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1046 {
1047         return  (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1048                  !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1049 }
1050 
1051 static inline int
1052 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1053 {
1054         switch (family) {
1055         case AF_INET:
1056                 return __xfrm4_state_addr_cmp(tmpl, x);
1057         case AF_INET6:
1058                 return __xfrm6_state_addr_cmp(tmpl, x);
1059         }
1060         return !0;
1061 }
1062 
1063 #ifdef CONFIG_XFRM
1064 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1065                         unsigned short family);
1066 
1067 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1068                                        struct sk_buff *skb,
1069                                        unsigned int family, int reverse)
1070 {
1071         struct net *net = dev_net(skb->dev);
1072         int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1073 
1074         if (sk && sk->sk_policy[XFRM_POLICY_IN])
1075                 return __xfrm_policy_check(sk, ndir, skb, family);
1076 
1077         return  (!net->xfrm.policy_count[dir] && !skb->sp) ||
1078                 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1079                 __xfrm_policy_check(sk, ndir, skb, family);
1080 }
1081 
1082 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1083 {
1084         return __xfrm_policy_check2(sk, dir, skb, family, 0);
1085 }
1086 
1087 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1088 {
1089         return xfrm_policy_check(sk, dir, skb, AF_INET);
1090 }
1091 
1092 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1093 {
1094         return xfrm_policy_check(sk, dir, skb, AF_INET6);
1095 }
1096 
1097 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1098                                              struct sk_buff *skb)
1099 {
1100         return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1101 }
1102 
1103 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1104                                              struct sk_buff *skb)
1105 {
1106         return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1107 }
1108 
1109 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1110                           unsigned int family, int reverse);
1111 
1112 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1113                                       unsigned int family)
1114 {
1115         return __xfrm_decode_session(skb, fl, family, 0);
1116 }
1117 
1118 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1119                                               struct flowi *fl,
1120                                               unsigned int family)
1121 {
1122         return __xfrm_decode_session(skb, fl, family, 1);
1123 }
1124 
1125 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1126 
1127 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1128 {
1129         struct net *net = dev_net(skb->dev);
1130 
1131         return  !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1132                 (skb_dst(skb)->flags & DST_NOXFRM) ||
1133                 __xfrm_route_forward(skb, family);
1134 }
1135 
1136 static inline int xfrm4_route_forward(struct sk_buff *skb)
1137 {
1138         return xfrm_route_forward(skb, AF_INET);
1139 }
1140 
1141 static inline int xfrm6_route_forward(struct sk_buff *skb)
1142 {
1143         return xfrm_route_forward(skb, AF_INET6);
1144 }
1145 
1146 int __xfrm_sk_clone_policy(struct sock *sk);
1147 
1148 static inline int xfrm_sk_clone_policy(struct sock *sk)
1149 {
1150         if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1151                 return __xfrm_sk_clone_policy(sk);
1152         return 0;
1153 }
1154 
1155 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1156 
1157 static inline void xfrm_sk_free_policy(struct sock *sk)
1158 {
1159         if (unlikely(sk->sk_policy[0] != NULL)) {
1160                 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1161                 sk->sk_policy[0] = NULL;
1162         }
1163         if (unlikely(sk->sk_policy[1] != NULL)) {
1164                 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1165                 sk->sk_policy[1] = NULL;
1166         }
1167 }
1168 
1169 void xfrm_garbage_collect(struct net *net);
1170 
1171 #else
1172 
1173 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1174 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1175 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }  
1176 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 
1177 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1178 { 
1179         return 1; 
1180 } 
1181 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1182 {
1183         return 1;
1184 }
1185 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1186 {
1187         return 1;
1188 }
1189 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1190                                               struct flowi *fl,
1191                                               unsigned int family)
1192 {
1193         return -ENOSYS;
1194 }
1195 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1196                                              struct sk_buff *skb)
1197 {
1198         return 1;
1199 }
1200 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1201                                              struct sk_buff *skb)
1202 {
1203         return 1;
1204 }
1205 static inline void xfrm_garbage_collect(struct net *net)
1206 {
1207 }
1208 #endif
1209 
1210 static __inline__
1211 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1212 {
1213         switch (family){
1214         case AF_INET:
1215                 return (xfrm_address_t *)&fl->u.ip4.daddr;
1216         case AF_INET6:
1217                 return (xfrm_address_t *)&fl->u.ip6.daddr;
1218         }
1219         return NULL;
1220 }
1221 
1222 static __inline__
1223 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1224 {
1225         switch (family){
1226         case AF_INET:
1227                 return (xfrm_address_t *)&fl->u.ip4.saddr;
1228         case AF_INET6:
1229                 return (xfrm_address_t *)&fl->u.ip6.saddr;
1230         }
1231         return NULL;
1232 }
1233 
1234 static __inline__
1235 void xfrm_flowi_addr_get(const struct flowi *fl,
1236                          xfrm_address_t *saddr, xfrm_address_t *daddr,
1237                          unsigned short family)
1238 {
1239         switch(family) {
1240         case AF_INET:
1241                 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1242                 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1243                 break;
1244         case AF_INET6:
1245                 *(struct in6_addr *)saddr->a6 = fl->u.ip6.saddr;
1246                 *(struct in6_addr *)daddr->a6 = fl->u.ip6.daddr;
1247                 break;
1248         }
1249 }
1250 
1251 static __inline__ int
1252 __xfrm4_state_addr_check(const struct xfrm_state *x,
1253                          const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1254 {
1255         if (daddr->a4 == x->id.daddr.a4 &&
1256             (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1257                 return 1;
1258         return 0;
1259 }
1260 
1261 static __inline__ int
1262 __xfrm6_state_addr_check(const struct xfrm_state *x,
1263                          const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1264 {
1265         if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1266             (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1267              ipv6_addr_any((struct in6_addr *)saddr) || 
1268              ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1269                 return 1;
1270         return 0;
1271 }
1272 
1273 static __inline__ int
1274 xfrm_state_addr_check(const struct xfrm_state *x,
1275                       const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1276                       unsigned short family)
1277 {
1278         switch (family) {
1279         case AF_INET:
1280                 return __xfrm4_state_addr_check(x, daddr, saddr);
1281         case AF_INET6:
1282                 return __xfrm6_state_addr_check(x, daddr, saddr);
1283         }
1284         return 0;
1285 }
1286 
1287 static __inline__ int
1288 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1289                            unsigned short family)
1290 {
1291         switch (family) {
1292         case AF_INET:
1293                 return __xfrm4_state_addr_check(x,
1294                                                 (const xfrm_address_t *)&fl->u.ip4.daddr,
1295                                                 (const xfrm_address_t *)&fl->u.ip4.saddr);
1296         case AF_INET6:
1297                 return __xfrm6_state_addr_check(x,
1298                                                 (const xfrm_address_t *)&fl->u.ip6.daddr,
1299                                                 (const xfrm_address_t *)&fl->u.ip6.saddr);
1300         }
1301         return 0;
1302 }
1303 
1304 static inline int xfrm_state_kern(const struct xfrm_state *x)
1305 {
1306         return atomic_read(&x->tunnel_users);
1307 }
1308 
1309 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1310 {
1311         return (!userproto || proto == userproto ||
1312                 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1313                                                   proto == IPPROTO_ESP ||
1314                                                   proto == IPPROTO_COMP)));
1315 }
1316 
1317 /*
1318  * xfrm algorithm information
1319  */
1320 struct xfrm_algo_aead_info {
1321         u16 icv_truncbits;
1322 };
1323 
1324 struct xfrm_algo_auth_info {
1325         u16 icv_truncbits;
1326         u16 icv_fullbits;
1327 };
1328 
1329 struct xfrm_algo_encr_info {
1330         u16 blockbits;
1331         u16 defkeybits;
1332 };
1333 
1334 struct xfrm_algo_comp_info {
1335         u16 threshold;
1336 };
1337 
1338 struct xfrm_algo_desc {
1339         char *name;
1340         char *compat;
1341         u8 available:1;
1342         u8 pfkey_supported:1;
1343         union {
1344                 struct xfrm_algo_aead_info aead;
1345                 struct xfrm_algo_auth_info auth;
1346                 struct xfrm_algo_encr_info encr;
1347                 struct xfrm_algo_comp_info comp;
1348         } uinfo;
1349         struct sadb_alg desc;
1350 };
1351 
1352 /* XFRM protocol handlers.  */
1353 struct xfrm4_protocol {
1354         int (*handler)(struct sk_buff *skb);
1355         int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1356                              int encap_type);
1357         int (*cb_handler)(struct sk_buff *skb, int err);
1358         int (*err_handler)(struct sk_buff *skb, u32 info);
1359 
1360         struct xfrm4_protocol __rcu *next;
1361         int priority;
1362 };
1363 
1364 struct xfrm6_protocol {
1365         int (*handler)(struct sk_buff *skb);
1366         int (*cb_handler)(struct sk_buff *skb, int err);
1367         int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1368                            u8 type, u8 code, int offset, __be32 info);
1369 
1370         struct xfrm6_protocol __rcu *next;
1371         int priority;
1372 };
1373 
1374 /* XFRM tunnel handlers.  */
1375 struct xfrm_tunnel {
1376         int (*handler)(struct sk_buff *skb);
1377         int (*err_handler)(struct sk_buff *skb, u32 info);
1378 
1379         struct xfrm_tunnel __rcu *next;
1380         int priority;
1381 };
1382 
1383 struct xfrm6_tunnel {
1384         int (*handler)(struct sk_buff *skb);
1385         int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1386                            u8 type, u8 code, int offset, __be32 info);
1387         struct xfrm6_tunnel __rcu *next;
1388         int priority;
1389 };
1390 
1391 void xfrm_init(void);
1392 void xfrm4_init(void);
1393 int xfrm_state_init(struct net *net);
1394 void xfrm_state_fini(struct net *net);
1395 void xfrm4_state_init(void);
1396 void xfrm4_protocol_init(void);
1397 #ifdef CONFIG_XFRM
1398 int xfrm6_init(void);
1399 void xfrm6_fini(void);
1400 int xfrm6_state_init(void);
1401 void xfrm6_state_fini(void);
1402 int xfrm6_protocol_init(void);
1403 void xfrm6_protocol_fini(void);
1404 #else
1405 static inline int xfrm6_init(void)
1406 {
1407         return 0;
1408 }
1409 static inline void xfrm6_fini(void)
1410 {
1411         ;
1412 }
1413 #endif
1414 
1415 #ifdef CONFIG_XFRM_STATISTICS
1416 int xfrm_proc_init(struct net *net);
1417 void xfrm_proc_fini(struct net *net);
1418 #endif
1419 
1420 int xfrm_sysctl_init(struct net *net);
1421 #ifdef CONFIG_SYSCTL
1422 void xfrm_sysctl_fini(struct net *net);
1423 #else
1424 static inline void xfrm_sysctl_fini(struct net *net)
1425 {
1426 }
1427 #endif
1428 
1429 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1430                           struct xfrm_address_filter *filter);
1431 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1432                     int (*func)(struct xfrm_state *, int, void*), void *);
1433 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1434 struct xfrm_state *xfrm_state_alloc(struct net *net);
1435 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1436                                    const xfrm_address_t *saddr,
1437                                    const struct flowi *fl,
1438                                    struct xfrm_tmpl *tmpl,
1439                                    struct xfrm_policy *pol, int *err,
1440                                    unsigned short family);
1441 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1442                                        xfrm_address_t *daddr,
1443                                        xfrm_address_t *saddr,
1444                                        unsigned short family,
1445                                        u8 mode, u8 proto, u32 reqid);
1446 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1447                                               unsigned short family);
1448 int xfrm_state_check_expire(struct xfrm_state *x);
1449 void xfrm_state_insert(struct xfrm_state *x);
1450 int xfrm_state_add(struct xfrm_state *x);
1451 int xfrm_state_update(struct xfrm_state *x);
1452 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1453                                      const xfrm_address_t *daddr, __be32 spi,
1454                                      u8 proto, unsigned short family);
1455 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1456                                             const xfrm_address_t *daddr,
1457                                             const xfrm_address_t *saddr,
1458                                             u8 proto,
1459                                             unsigned short family);
1460 #ifdef CONFIG_XFRM_SUB_POLICY
1461 int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1462                    unsigned short family, struct net *net);
1463 int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1464                     unsigned short family);
1465 #else
1466 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1467                                  int n, unsigned short family, struct net *net)
1468 {
1469         return -ENOSYS;
1470 }
1471 
1472 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1473                                   int n, unsigned short family)
1474 {
1475         return -ENOSYS;
1476 }
1477 #endif
1478 
1479 struct xfrmk_sadinfo {
1480         u32 sadhcnt; /* current hash bkts */
1481         u32 sadhmcnt; /* max allowed hash bkts */
1482         u32 sadcnt; /* current running count */
1483 };
1484 
1485 struct xfrmk_spdinfo {
1486         u32 incnt;
1487         u32 outcnt;
1488         u32 fwdcnt;
1489         u32 inscnt;
1490         u32 outscnt;
1491         u32 fwdscnt;
1492         u32 spdhcnt;
1493         u32 spdhmcnt;
1494 };
1495 
1496 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1497 int xfrm_state_delete(struct xfrm_state *x);
1498 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid);
1499 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1500 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1501 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1502 int xfrm_init_replay(struct xfrm_state *x);
1503 int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1504 int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
1505 int xfrm_init_state(struct xfrm_state *x);
1506 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1507 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1508 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1509 int xfrm_output_resume(struct sk_buff *skb, int err);
1510 int xfrm_output(struct sk_buff *skb);
1511 int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1512 void xfrm_local_error(struct sk_buff *skb, int mtu);
1513 int xfrm4_extract_header(struct sk_buff *skb);
1514 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1515 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1516                     int encap_type);
1517 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1518 int xfrm4_rcv(struct sk_buff *skb);
1519 
1520 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1521 {
1522         XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1523         XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1524         XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1525         return xfrm_input(skb, nexthdr, spi, 0);
1526 }
1527 
1528 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1529 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1530 int xfrm4_output(struct sock *sk, struct sk_buff *skb);
1531 int xfrm4_output_finish(struct sk_buff *skb);
1532 int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1533 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1534 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1535 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1536 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1537 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1538 int xfrm6_extract_header(struct sk_buff *skb);
1539 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1540 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1541 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1542 int xfrm6_rcv(struct sk_buff *skb);
1543 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1544                      xfrm_address_t *saddr, u8 proto);
1545 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1546 int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1547 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1548 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1549 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1550 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1551 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1552 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1553 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1554 int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1555 int xfrm6_output(struct sock *sk, struct sk_buff *skb);
1556 int xfrm6_output_finish(struct sk_buff *skb);
1557 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1558                           u8 **prevhdr);
1559 
1560 #ifdef CONFIG_XFRM
1561 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1562 int xfrm_user_policy(struct sock *sk, int optname,
1563                      u8 __user *optval, int optlen);
1564 #else
1565 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1566 {
1567         return -ENOPROTOOPT;
1568 } 
1569 
1570 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1571 {
1572         /* should not happen */
1573         kfree_skb(skb);
1574         return 0;
1575 }
1576 #endif
1577 
1578 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1579 
1580 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1581 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1582                      int (*func)(struct xfrm_policy *, int, int, void*),
1583                      void *);
1584 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1585 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1586 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1587                                           u8 type, int dir,
1588                                           struct xfrm_selector *sel,
1589                                           struct xfrm_sec_ctx *ctx, int delete,
1590                                           int *err);
1591 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
1592                                      u32 id, int delete, int *err);
1593 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1594 void xfrm_policy_hash_rebuild(struct net *net);
1595 u32 xfrm_get_acqseq(void);
1596 int verify_spi_info(u8 proto, u32 min, u32 max);
1597 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1598 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1599                                  u8 mode, u32 reqid, u8 proto,
1600                                  const xfrm_address_t *daddr,
1601                                  const xfrm_address_t *saddr, int create,
1602                                  unsigned short family);
1603 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1604 
1605 #ifdef CONFIG_XFRM_MIGRATE
1606 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1607                const struct xfrm_migrate *m, int num_bundles,
1608                const struct xfrm_kmaddress *k);
1609 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1610 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1611                                       struct xfrm_migrate *m);
1612 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1613                  struct xfrm_migrate *m, int num_bundles,
1614                  struct xfrm_kmaddress *k, struct net *net);
1615 #endif
1616 
1617 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1618 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1619 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1620               xfrm_address_t *addr);
1621 
1622 void xfrm_input_init(void);
1623 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1624 
1625 void xfrm_probe_algs(void);
1626 int xfrm_count_pfkey_auth_supported(void);
1627 int xfrm_count_pfkey_enc_supported(void);
1628 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1629 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1630 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1631 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1632 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1633 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1634 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1635 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1636 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1637                                             int probe);
1638 
1639 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1640                                     const xfrm_address_t *b)
1641 {
1642         return ipv6_addr_equal((const struct in6_addr *)a,
1643                                (const struct in6_addr *)b);
1644 }
1645 
1646 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1647                                    const xfrm_address_t *b,
1648                                    sa_family_t family)
1649 {
1650         switch (family) {
1651         default:
1652         case AF_INET:
1653                 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1654         case AF_INET6:
1655                 return xfrm6_addr_equal(a, b);
1656         }
1657 }
1658 
1659 static inline int xfrm_policy_id2dir(u32 index)
1660 {
1661         return index & 7;
1662 }
1663 
1664 #ifdef CONFIG_XFRM
1665 static inline int xfrm_aevent_is_on(struct net *net)
1666 {
1667         struct sock *nlsk;
1668         int ret = 0;
1669 
1670         rcu_read_lock();
1671         nlsk = rcu_dereference(net->xfrm.nlsk);
1672         if (nlsk)
1673                 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1674         rcu_read_unlock();
1675         return ret;
1676 }
1677 
1678 static inline int xfrm_acquire_is_on(struct net *net)
1679 {
1680         struct sock *nlsk;
1681         int ret = 0;
1682 
1683         rcu_read_lock();
1684         nlsk = rcu_dereference(net->xfrm.nlsk);
1685         if (nlsk)
1686                 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1687         rcu_read_unlock();
1688 
1689         return ret;
1690 }
1691 #endif
1692 
1693 static inline int aead_len(struct xfrm_algo_aead *alg)
1694 {
1695         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1696 }
1697 
1698 static inline int xfrm_alg_len(const struct xfrm_algo *alg)
1699 {
1700         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1701 }
1702 
1703 static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1704 {
1705         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1706 }
1707 
1708 static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1709 {
1710         return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1711 }
1712 
1713 #ifdef CONFIG_XFRM_MIGRATE
1714 static inline int xfrm_replay_clone(struct xfrm_state *x,
1715                                      struct xfrm_state *orig)
1716 {
1717         x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1718                                 GFP_KERNEL);
1719         if (!x->replay_esn)
1720                 return -ENOMEM;
1721 
1722         x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1723         x->replay_esn->replay_window = orig->replay_esn->replay_window;
1724 
1725         x->preplay_esn = kmemdup(x->replay_esn,
1726                                  xfrm_replay_state_esn_len(x->replay_esn),
1727                                  GFP_KERNEL);
1728         if (!x->preplay_esn) {
1729                 kfree(x->replay_esn);
1730                 return -ENOMEM;
1731         }
1732 
1733         return 0;
1734 }
1735 
1736 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1737 {
1738         return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1739 }
1740 
1741 
1742 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1743 {
1744         return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1745 }
1746 
1747 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1748 {
1749         return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1750 }
1751 
1752 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1753 {
1754         int i;
1755         for (i = 0; i < n; i++)
1756                 xfrm_state_put(*(states + i));
1757 }
1758 
1759 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1760 {
1761         int i;
1762         for (i = 0; i < n; i++)
1763                 xfrm_state_delete(*(states + i));
1764 }
1765 #endif
1766 
1767 #ifdef CONFIG_XFRM
1768 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1769 {
1770         return skb->sp->xvec[skb->sp->len - 1];
1771 }
1772 #endif
1773 
1774 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1775 {
1776         if (attrs[XFRMA_MARK])
1777                 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1778         else
1779                 m->v = m->m = 0;
1780 
1781         return m->v & m->m;
1782 }
1783 
1784 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
1785 {
1786         int ret = 0;
1787 
1788         if (m->m | m->v)
1789                 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
1790         return ret;
1791 }
1792 
1793 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
1794                                     unsigned int family)
1795 {
1796         bool tunnel = false;
1797 
1798         switch(family) {
1799         case AF_INET:
1800                 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
1801                         tunnel = true;
1802                 break;
1803         case AF_INET6:
1804                 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
1805                         tunnel = true;
1806                 break;
1807         }
1808         if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
1809                 return -EINVAL;
1810 
1811         return 0;
1812 }
1813 #endif  /* _NET_XFRM_H */
1814 

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