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

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