~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.19-rc8 ] ~ [ linux-5.18.14 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.57 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.133 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.207 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.253 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.289 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.324 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _NET_XFRM_H
  3 #define _NET_XFRM_H
  4 
  5 #include <linux/compiler.h>
  6 #include <linux/xfrm.h>
  7 #include <linux/spinlock.h>
  8 #include <linux/list.h>
  9 #include <linux/skbuff.h>
 10 #include <linux/socket.h>
 11 #include <linux/pfkeyv2.h>
 12 #include <linux/ipsec.h>
 13 #include <linux/in6.h>
 14 #include <linux/mutex.h>
 15 #include <linux/audit.h>
 16 #include <linux/slab.h>
 17 #include <linux/refcount.h>
 18 
 19 #include <net/sock.h>
 20 #include <net/dst.h>
 21 #include <net/ip.h>
 22 #include <net/route.h>
 23 #include <net/ipv6.h>
 24 #include <net/ip6_fib.h>
 25 #include <net/flow.h>
 26 
 27 #include <linux/interrupt.h>
 28 
 29 #ifdef CONFIG_XFRM_STATISTICS
 30 #include <net/snmp.h>
 31 #endif
 32 
 33 #define XFRM_PROTO_ESP          50
 34 #define XFRM_PROTO_AH           51
 35 #define XFRM_PROTO_COMP         108
 36 #define XFRM_PROTO_IPIP         4
 37 #define XFRM_PROTO_IPV6         41
 38 #define XFRM_PROTO_ROUTING      IPPROTO_ROUTING
 39 #define XFRM_PROTO_DSTOPTS      IPPROTO_DSTOPTS
 40 
 41 #define XFRM_ALIGN4(len)        (((len) + 3) & ~3)
 42 #define XFRM_ALIGN8(len)        (((len) + 7) & ~7)
 43 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
 44         MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
 45 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
 46         MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
 47 #define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \
 48         MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto))
 49 
 50 #ifdef CONFIG_XFRM_STATISTICS
 51 #define XFRM_INC_STATS(net, field)      SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
 52 #else
 53 #define XFRM_INC_STATS(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 struct xfrm_state_offload {
128         struct net_device       *dev;
129         unsigned long           offload_handle;
130         unsigned int            num_exthdrs;
131         u8                      flags;
132 };
133 
134 /* Full description of state of transformer. */
135 struct xfrm_state {
136         possible_net_t          xs_net;
137         union {
138                 struct hlist_node       gclist;
139                 struct hlist_node       bydst;
140         };
141         struct hlist_node       bysrc;
142         struct hlist_node       byspi;
143 
144         refcount_t              refcnt;
145         spinlock_t              lock;
146 
147         struct xfrm_id          id;
148         struct xfrm_selector    sel;
149         struct xfrm_mark        mark;
150         u32                     tfcpad;
151 
152         u32                     genid;
153 
154         /* Key manager bits */
155         struct xfrm_state_walk  km;
156 
157         /* Parameters of this state. */
158         struct {
159                 u32             reqid;
160                 u8              mode;
161                 u8              replay_window;
162                 u8              aalgo, ealgo, calgo;
163                 u8              flags;
164                 u16             family;
165                 xfrm_address_t  saddr;
166                 int             header_len;
167                 int             trailer_len;
168                 u32             extra_flags;
169                 u32             output_mark;
170         } props;
171 
172         struct xfrm_lifetime_cfg lft;
173 
174         /* Data for transformer */
175         struct xfrm_algo_auth   *aalg;
176         struct xfrm_algo        *ealg;
177         struct xfrm_algo        *calg;
178         struct xfrm_algo_aead   *aead;
179         const char              *geniv;
180 
181         /* Data for encapsulator */
182         struct xfrm_encap_tmpl  *encap;
183 
184         /* Data for care-of address */
185         xfrm_address_t  *coaddr;
186 
187         /* IPComp needs an IPIP tunnel for handling uncompressed packets */
188         struct xfrm_state       *tunnel;
189 
190         /* If a tunnel, number of users + 1 */
191         atomic_t                tunnel_users;
192 
193         /* State for replay detection */
194         struct xfrm_replay_state replay;
195         struct xfrm_replay_state_esn *replay_esn;
196 
197         /* Replay detection state at the time we sent the last notification */
198         struct xfrm_replay_state preplay;
199         struct xfrm_replay_state_esn *preplay_esn;
200 
201         /* The functions for replay detection. */
202         const struct xfrm_replay *repl;
203 
204         /* internal flag that only holds state for delayed aevent at the
205          * moment
206         */
207         u32                     xflags;
208 
209         /* Replay detection notification settings */
210         u32                     replay_maxage;
211         u32                     replay_maxdiff;
212 
213         /* Replay detection notification timer */
214         struct timer_list       rtimer;
215 
216         /* Statistics */
217         struct xfrm_stats       stats;
218 
219         struct xfrm_lifetime_cur curlft;
220         struct tasklet_hrtimer  mtimer;
221 
222         struct xfrm_state_offload xso;
223 
224         /* used to fix curlft->add_time when changing date */
225         long            saved_tmo;
226 
227         /* Last used time */
228         unsigned long           lastused;
229 
230         struct page_frag xfrag;
231 
232         /* Reference to data common to all the instances of this
233          * transformer. */
234         const struct xfrm_type  *type;
235         struct xfrm_mode        *inner_mode;
236         struct xfrm_mode        *inner_mode_iaf;
237         struct xfrm_mode        *outer_mode;
238 
239         const struct xfrm_type_offload  *type_offload;
240 
241         /* Security context */
242         struct xfrm_sec_ctx     *security;
243 
244         /* Private data of this transformer, format is opaque,
245          * interpreted by xfrm_type methods. */
246         void                    *data;
247 };
248 
249 static inline struct net *xs_net(struct xfrm_state *x)
250 {
251         return read_pnet(&x->xs_net);
252 }
253 
254 /* xflags - make enum if more show up */
255 #define XFRM_TIME_DEFER 1
256 #define XFRM_SOFT_EXPIRE 2
257 
258 enum {
259         XFRM_STATE_VOID,
260         XFRM_STATE_ACQ,
261         XFRM_STATE_VALID,
262         XFRM_STATE_ERROR,
263         XFRM_STATE_EXPIRED,
264         XFRM_STATE_DEAD
265 };
266 
267 /* callback structure passed from either netlink or pfkey */
268 struct km_event {
269         union {
270                 u32 hard;
271                 u32 proto;
272                 u32 byid;
273                 u32 aevent;
274                 u32 type;
275         } data;
276 
277         u32     seq;
278         u32     portid;
279         u32     event;
280         struct net *net;
281 };
282 
283 struct xfrm_replay {
284         void    (*advance)(struct xfrm_state *x, __be32 net_seq);
285         int     (*check)(struct xfrm_state *x,
286                          struct sk_buff *skb,
287                          __be32 net_seq);
288         int     (*recheck)(struct xfrm_state *x,
289                            struct sk_buff *skb,
290                            __be32 net_seq);
291         void    (*notify)(struct xfrm_state *x, int event);
292         int     (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
293 };
294 
295 struct net_device;
296 struct xfrm_type;
297 struct xfrm_dst;
298 struct xfrm_policy_afinfo {
299         struct dst_ops          *dst_ops;
300         struct dst_entry        *(*dst_lookup)(struct net *net,
301                                                int tos, int oif,
302                                                const xfrm_address_t *saddr,
303                                                const xfrm_address_t *daddr,
304                                                u32 mark);
305         int                     (*get_saddr)(struct net *net, int oif,
306                                              xfrm_address_t *saddr,
307                                              xfrm_address_t *daddr,
308                                              u32 mark);
309         void                    (*decode_session)(struct sk_buff *skb,
310                                                   struct flowi *fl,
311                                                   int reverse);
312         int                     (*get_tos)(const struct flowi *fl);
313         int                     (*init_path)(struct xfrm_dst *path,
314                                              struct dst_entry *dst,
315                                              int nfheader_len);
316         int                     (*fill_dst)(struct xfrm_dst *xdst,
317                                             struct net_device *dev,
318                                             const struct flowi *fl);
319         struct dst_entry        *(*blackhole_route)(struct net *net, struct dst_entry *orig);
320 };
321 
322 int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family);
323 void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
324 void km_policy_notify(struct xfrm_policy *xp, int dir,
325                       const struct km_event *c);
326 void xfrm_policy_cache_flush(void);
327 void km_state_notify(struct xfrm_state *x, const struct km_event *c);
328 
329 struct xfrm_tmpl;
330 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
331              struct xfrm_policy *pol);
332 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
333 int __xfrm_state_delete(struct xfrm_state *x);
334 
335 struct xfrm_state_afinfo {
336         unsigned int                    family;
337         unsigned int                    proto;
338         __be16                          eth_proto;
339         struct module                   *owner;
340         const struct xfrm_type          *type_map[IPPROTO_MAX];
341         const struct xfrm_type_offload  *type_offload_map[IPPROTO_MAX];
342         struct xfrm_mode                *mode_map[XFRM_MODE_MAX];
343 
344         int                     (*init_flags)(struct xfrm_state *x);
345         void                    (*init_tempsel)(struct xfrm_selector *sel,
346                                                 const struct flowi *fl);
347         void                    (*init_temprop)(struct xfrm_state *x,
348                                                 const struct xfrm_tmpl *tmpl,
349                                                 const xfrm_address_t *daddr,
350                                                 const xfrm_address_t *saddr);
351         int                     (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
352         int                     (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
353         int                     (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
354         int                     (*output_finish)(struct sock *sk, struct sk_buff *skb);
355         int                     (*extract_input)(struct xfrm_state *x,
356                                                  struct sk_buff *skb);
357         int                     (*extract_output)(struct xfrm_state *x,
358                                                   struct sk_buff *skb);
359         int                     (*transport_finish)(struct sk_buff *skb,
360                                                     int async);
361         void                    (*local_error)(struct sk_buff *skb, u32 mtu);
362 };
363 
364 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
365 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
366 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
367 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
368 
369 struct xfrm_input_afinfo {
370         unsigned int            family;
371         int                     (*callback)(struct sk_buff *skb, u8 protocol,
372                                             int err);
373 };
374 
375 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo);
376 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo);
377 
378 void xfrm_state_delete_tunnel(struct xfrm_state *x);
379 
380 struct xfrm_type {
381         char                    *description;
382         struct module           *owner;
383         u8                      proto;
384         u8                      flags;
385 #define XFRM_TYPE_NON_FRAGMENT  1
386 #define XFRM_TYPE_REPLAY_PROT   2
387 #define XFRM_TYPE_LOCAL_COADDR  4
388 #define XFRM_TYPE_REMOTE_COADDR 8
389 
390         int                     (*init_state)(struct xfrm_state *x);
391         void                    (*destructor)(struct xfrm_state *);
392         int                     (*input)(struct xfrm_state *, struct sk_buff *skb);
393         int                     (*output)(struct xfrm_state *, struct sk_buff *pskb);
394         int                     (*reject)(struct xfrm_state *, struct sk_buff *,
395                                           const struct flowi *);
396         int                     (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
397         /* Estimate maximal size of result of transformation of a dgram */
398         u32                     (*get_mtu)(struct xfrm_state *, int size);
399 };
400 
401 int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
402 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
403 
404 struct xfrm_type_offload {
405         char            *description;
406         struct module   *owner;
407         u8              proto;
408         void            (*encap)(struct xfrm_state *, struct sk_buff *pskb);
409         int             (*input_tail)(struct xfrm_state *x, struct sk_buff *skb);
410         int             (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features);
411 };
412 
413 int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family);
414 int xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family);
415 
416 struct xfrm_mode {
417         /*
418          * Remove encapsulation header.
419          *
420          * The IP header will be moved over the top of the encapsulation
421          * header.
422          *
423          * On entry, the transport header shall point to where the IP header
424          * should be and the network header shall be set to where the IP
425          * header currently is.  skb->data shall point to the start of the
426          * payload.
427          */
428         int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
429 
430         /*
431          * This is the actual input entry point.
432          *
433          * For transport mode and equivalent this would be identical to
434          * input2 (which does not need to be set).  While tunnel mode
435          * and equivalent would set this to the tunnel encapsulation function
436          * xfrm4_prepare_input that would in turn call input2.
437          */
438         int (*input)(struct xfrm_state *x, struct sk_buff *skb);
439 
440         /*
441          * Add encapsulation header.
442          *
443          * On exit, the transport header will be set to the start of the
444          * encapsulation header to be filled in by x->type->output and
445          * the mac header will be set to the nextheader (protocol for
446          * IPv4) field of the extension header directly preceding the
447          * encapsulation header, or in its absence, that of the top IP
448          * header.  The value of the network header will always point
449          * to the top IP header while skb->data will point to the payload.
450          */
451         int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
452 
453         /*
454          * This is the actual output entry point.
455          *
456          * For transport mode and equivalent this would be identical to
457          * output2 (which does not need to be set).  While tunnel mode
458          * and equivalent would set this to a tunnel encapsulation function
459          * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
460          * call output2.
461          */
462         int (*output)(struct xfrm_state *x, struct sk_buff *skb);
463 
464         /*
465          * Adjust pointers into the packet and do GSO segmentation.
466          */
467         struct sk_buff *(*gso_segment)(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features);
468 
469         /*
470          * Adjust pointers into the packet when IPsec is done at layer2.
471          */
472         void (*xmit)(struct xfrm_state *x, struct sk_buff *skb);
473 
474         struct xfrm_state_afinfo *afinfo;
475         struct module *owner;
476         unsigned int encap;
477         int flags;
478 };
479 
480 /* Flags for xfrm_mode. */
481 enum {
482         XFRM_MODE_FLAG_TUNNEL = 1,
483 };
484 
485 int xfrm_register_mode(struct xfrm_mode *mode, int family);
486 int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
487 
488 static inline int xfrm_af2proto(unsigned int family)
489 {
490         switch(family) {
491         case AF_INET:
492                 return IPPROTO_IPIP;
493         case AF_INET6:
494                 return IPPROTO_IPV6;
495         default:
496                 return 0;
497         }
498 }
499 
500 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
501 {
502         if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
503             (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
504                 return x->inner_mode;
505         else
506                 return x->inner_mode_iaf;
507 }
508 
509 struct xfrm_tmpl {
510 /* id in template is interpreted as:
511  * daddr - destination of tunnel, may be zero for transport mode.
512  * spi   - zero to acquire spi. Not zero if spi is static, then
513  *         daddr must be fixed too.
514  * proto - AH/ESP/IPCOMP
515  */
516         struct xfrm_id          id;
517 
518 /* Source address of tunnel. Ignored, if it is not a tunnel. */
519         xfrm_address_t          saddr;
520 
521         unsigned short          encap_family;
522 
523         u32                     reqid;
524 
525 /* Mode: transport, tunnel etc. */
526         u8                      mode;
527 
528 /* Sharing mode: unique, this session only, this user only etc. */
529         u8                      share;
530 
531 /* May skip this transfomration if no SA is found */
532         u8                      optional;
533 
534 /* Skip aalgos/ealgos/calgos checks. */
535         u8                      allalgs;
536 
537 /* Bit mask of algos allowed for acquisition */
538         u32                     aalgos;
539         u32                     ealgos;
540         u32                     calgos;
541 };
542 
543 #define XFRM_MAX_DEPTH          6
544 #define XFRM_MAX_OFFLOAD_DEPTH  1
545 
546 struct xfrm_policy_walk_entry {
547         struct list_head        all;
548         u8                      dead;
549 };
550 
551 struct xfrm_policy_walk {
552         struct xfrm_policy_walk_entry walk;
553         u8 type;
554         u32 seq;
555 };
556 
557 struct xfrm_policy_queue {
558         struct sk_buff_head     hold_queue;
559         struct timer_list       hold_timer;
560         unsigned long           timeout;
561 };
562 
563 struct xfrm_policy {
564         possible_net_t          xp_net;
565         struct hlist_node       bydst;
566         struct hlist_node       byidx;
567 
568         /* This lock only affects elements except for entry. */
569         rwlock_t                lock;
570         refcount_t              refcnt;
571         struct timer_list       timer;
572 
573         atomic_t                genid;
574         u32                     priority;
575         u32                     index;
576         struct xfrm_mark        mark;
577         struct xfrm_selector    selector;
578         struct xfrm_lifetime_cfg lft;
579         struct xfrm_lifetime_cur curlft;
580         struct xfrm_policy_walk_entry walk;
581         struct xfrm_policy_queue polq;
582         u8                      type;
583         u8                      action;
584         u8                      flags;
585         u8                      xfrm_nr;
586         u16                     family;
587         struct xfrm_sec_ctx     *security;
588         struct xfrm_tmpl        xfrm_vec[XFRM_MAX_DEPTH];
589         struct rcu_head         rcu;
590 };
591 
592 static inline struct net *xp_net(const struct xfrm_policy *xp)
593 {
594         return read_pnet(&xp->xp_net);
595 }
596 
597 struct xfrm_kmaddress {
598         xfrm_address_t          local;
599         xfrm_address_t          remote;
600         u32                     reserved;
601         u16                     family;
602 };
603 
604 struct xfrm_migrate {
605         xfrm_address_t          old_daddr;
606         xfrm_address_t          old_saddr;
607         xfrm_address_t          new_daddr;
608         xfrm_address_t          new_saddr;
609         u8                      proto;
610         u8                      mode;
611         u16                     reserved;
612         u32                     reqid;
613         u16                     old_family;
614         u16                     new_family;
615 };
616 
617 #define XFRM_KM_TIMEOUT                30
618 /* what happened */
619 #define XFRM_REPLAY_UPDATE      XFRM_AE_CR
620 #define XFRM_REPLAY_TIMEOUT     XFRM_AE_CE
621 
622 /* default aevent timeout in units of 100ms */
623 #define XFRM_AE_ETIME                   10
624 /* Async Event timer multiplier */
625 #define XFRM_AE_ETH_M                   10
626 /* default seq threshold size */
627 #define XFRM_AE_SEQT_SIZE               2
628 
629 struct xfrm_mgr {
630         struct list_head        list;
631         int                     (*notify)(struct xfrm_state *x, const struct km_event *c);
632         int                     (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
633         struct xfrm_policy      *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
634         int                     (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
635         int                     (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
636         int                     (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
637         int                     (*migrate)(const struct xfrm_selector *sel,
638                                            u8 dir, u8 type,
639                                            const struct xfrm_migrate *m,
640                                            int num_bundles,
641                                            const struct xfrm_kmaddress *k,
642                                            const struct xfrm_encap_tmpl *encap);
643         bool                    (*is_alive)(const struct km_event *c);
644 };
645 
646 int xfrm_register_km(struct xfrm_mgr *km);
647 int xfrm_unregister_km(struct xfrm_mgr *km);
648 
649 struct xfrm_tunnel_skb_cb {
650         union {
651                 struct inet_skb_parm h4;
652                 struct inet6_skb_parm h6;
653         } header;
654 
655         union {
656                 struct ip_tunnel *ip4;
657                 struct ip6_tnl *ip6;
658         } tunnel;
659 };
660 
661 #define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
662 
663 /*
664  * This structure is used for the duration where packets are being
665  * transformed by IPsec.  As soon as the packet leaves IPsec the
666  * area beyond the generic IP part may be overwritten.
667  */
668 struct xfrm_skb_cb {
669         struct xfrm_tunnel_skb_cb header;
670 
671         /* Sequence number for replay protection. */
672         union {
673                 struct {
674                         __u32 low;
675                         __u32 hi;
676                 } output;
677                 struct {
678                         __be32 low;
679                         __be32 hi;
680                 } input;
681         } seq;
682 };
683 
684 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
685 
686 /*
687  * This structure is used by the afinfo prepare_input/prepare_output functions
688  * to transmit header information to the mode input/output functions.
689  */
690 struct xfrm_mode_skb_cb {
691         struct xfrm_tunnel_skb_cb header;
692 
693         /* Copied from header for IPv4, always set to zero and DF for IPv6. */
694         __be16 id;
695         __be16 frag_off;
696 
697         /* IP header length (excluding options or extension headers). */
698         u8 ihl;
699 
700         /* TOS for IPv4, class for IPv6. */
701         u8 tos;
702 
703         /* TTL for IPv4, hop limitfor IPv6. */
704         u8 ttl;
705 
706         /* Protocol for IPv4, NH for IPv6. */
707         u8 protocol;
708 
709         /* Option length for IPv4, zero for IPv6. */
710         u8 optlen;
711 
712         /* Used by IPv6 only, zero for IPv4. */
713         u8 flow_lbl[3];
714 };
715 
716 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
717 
718 /*
719  * This structure is used by the input processing to locate the SPI and
720  * related information.
721  */
722 struct xfrm_spi_skb_cb {
723         struct xfrm_tunnel_skb_cb header;
724 
725         unsigned int daddroff;
726         unsigned int family;
727         __be32 seq;
728 };
729 
730 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
731 
732 #ifdef CONFIG_AUDITSYSCALL
733 static inline struct audit_buffer *xfrm_audit_start(const char *op)
734 {
735         struct audit_buffer *audit_buf = NULL;
736 
737         if (audit_enabled == 0)
738                 return NULL;
739         audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
740                                     AUDIT_MAC_IPSEC_EVENT);
741         if (audit_buf == NULL)
742                 return NULL;
743         audit_log_format(audit_buf, "op=%s", op);
744         return audit_buf;
745 }
746 
747 static inline void xfrm_audit_helper_usrinfo(bool task_valid,
748                                              struct audit_buffer *audit_buf)
749 {
750         const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
751                                             audit_get_loginuid(current) :
752                                             INVALID_UID);
753         const unsigned int ses = task_valid ? audit_get_sessionid(current) :
754                 (unsigned int) -1;
755 
756         audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
757         audit_log_task_context(audit_buf);
758 }
759 
760 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
761 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
762                               bool task_valid);
763 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
764 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
765 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
766                                       struct sk_buff *skb);
767 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
768                              __be32 net_seq);
769 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
770 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
771                                __be32 net_seq);
772 void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
773                               u8 proto);
774 #else
775 
776 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
777                                          bool task_valid)
778 {
779 }
780 
781 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
782                                             bool task_valid)
783 {
784 }
785 
786 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
787                                         bool task_valid)
788 {
789 }
790 
791 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
792                                            bool task_valid)
793 {
794 }
795 
796 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
797                                              struct sk_buff *skb)
798 {
799 }
800 
801 static inline void xfrm_audit_state_replay(struct xfrm_state *x,
802                                            struct sk_buff *skb, __be32 net_seq)
803 {
804 }
805 
806 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
807                                       u16 family)
808 {
809 }
810 
811 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
812                                       __be32 net_spi, __be32 net_seq)
813 {
814 }
815 
816 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
817                                      struct sk_buff *skb, u8 proto)
818 {
819 }
820 #endif /* CONFIG_AUDITSYSCALL */
821 
822 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
823 {
824         if (likely(policy != NULL))
825                 refcount_inc(&policy->refcnt);
826 }
827 
828 void xfrm_policy_destroy(struct xfrm_policy *policy);
829 
830 static inline void xfrm_pol_put(struct xfrm_policy *policy)
831 {
832         if (refcount_dec_and_test(&policy->refcnt))
833                 xfrm_policy_destroy(policy);
834 }
835 
836 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
837 {
838         int i;
839         for (i = npols - 1; i >= 0; --i)
840                 xfrm_pol_put(pols[i]);
841 }
842 
843 void __xfrm_state_destroy(struct xfrm_state *);
844 
845 static inline void __xfrm_state_put(struct xfrm_state *x)
846 {
847         refcount_dec(&x->refcnt);
848 }
849 
850 static inline void xfrm_state_put(struct xfrm_state *x)
851 {
852         if (refcount_dec_and_test(&x->refcnt))
853                 __xfrm_state_destroy(x);
854 }
855 
856 static inline void xfrm_state_hold(struct xfrm_state *x)
857 {
858         refcount_inc(&x->refcnt);
859 }
860 
861 static inline bool addr_match(const void *token1, const void *token2,
862                               unsigned int prefixlen)
863 {
864         const __be32 *a1 = token1;
865         const __be32 *a2 = token2;
866         unsigned int pdw;
867         unsigned int pbi;
868 
869         pdw = prefixlen >> 5;     /* num of whole u32 in prefix */
870         pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
871 
872         if (pdw)
873                 if (memcmp(a1, a2, pdw << 2))
874                         return false;
875 
876         if (pbi) {
877                 __be32 mask;
878 
879                 mask = htonl((0xffffffff) << (32 - pbi));
880 
881                 if ((a1[pdw] ^ a2[pdw]) & mask)
882                         return false;
883         }
884 
885         return true;
886 }
887 
888 static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
889 {
890         /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
891         if (sizeof(long) == 4 && prefixlen == 0)
892                 return true;
893         return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen)));
894 }
895 
896 static __inline__
897 __be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
898 {
899         __be16 port;
900         switch(fl->flowi_proto) {
901         case IPPROTO_TCP:
902         case IPPROTO_UDP:
903         case IPPROTO_UDPLITE:
904         case IPPROTO_SCTP:
905                 port = uli->ports.sport;
906                 break;
907         case IPPROTO_ICMP:
908         case IPPROTO_ICMPV6:
909                 port = htons(uli->icmpt.type);
910                 break;
911         case IPPROTO_MH:
912                 port = htons(uli->mht.type);
913                 break;
914         case IPPROTO_GRE:
915                 port = htons(ntohl(uli->gre_key) >> 16);
916                 break;
917         default:
918                 port = 0;       /*XXX*/
919         }
920         return port;
921 }
922 
923 static __inline__
924 __be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
925 {
926         __be16 port;
927         switch(fl->flowi_proto) {
928         case IPPROTO_TCP:
929         case IPPROTO_UDP:
930         case IPPROTO_UDPLITE:
931         case IPPROTO_SCTP:
932                 port = uli->ports.dport;
933                 break;
934         case IPPROTO_ICMP:
935         case IPPROTO_ICMPV6:
936                 port = htons(uli->icmpt.code);
937                 break;
938         case IPPROTO_GRE:
939                 port = htons(ntohl(uli->gre_key) & 0xffff);
940                 break;
941         default:
942                 port = 0;       /*XXX*/
943         }
944         return port;
945 }
946 
947 bool xfrm_selector_match(const struct xfrm_selector *sel,
948                          const struct flowi *fl, unsigned short family);
949 
950 #ifdef CONFIG_SECURITY_NETWORK_XFRM
951 /*      If neither has a context --> match
952  *      Otherwise, both must have a context and the sids, doi, alg must match
953  */
954 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
955 {
956         return ((!s1 && !s2) ||
957                 (s1 && s2 &&
958                  (s1->ctx_sid == s2->ctx_sid) &&
959                  (s1->ctx_doi == s2->ctx_doi) &&
960                  (s1->ctx_alg == s2->ctx_alg)));
961 }
962 #else
963 static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
964 {
965         return true;
966 }
967 #endif
968 
969 /* A struct encoding bundle of transformations to apply to some set of flow.
970  *
971  * xdst->child points to the next element of bundle.
972  * dst->xfrm  points to an instanse of transformer.
973  *
974  * Due to unfortunate limitations of current routing cache, which we
975  * have no time to fix, it mirrors struct rtable and bound to the same
976  * routing key, including saddr,daddr. However, we can have many of
977  * bundles differing by session id. All the bundles grow from a parent
978  * policy rule.
979  */
980 struct xfrm_dst {
981         union {
982                 struct dst_entry        dst;
983                 struct rtable           rt;
984                 struct rt6_info         rt6;
985         } u;
986         struct dst_entry *route;
987         struct dst_entry *child;
988         struct dst_entry *path;
989         struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
990         int num_pols, num_xfrms;
991         u32 xfrm_genid;
992         u32 policy_genid;
993         u32 route_mtu_cached;
994         u32 child_mtu_cached;
995         u32 route_cookie;
996         u32 path_cookie;
997 };
998 
999 static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst)
1000 {
1001 #ifdef CONFIG_XFRM
1002         if (dst->xfrm) {
1003                 const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst;
1004 
1005                 return xdst->path;
1006         }
1007 #endif
1008         return (struct dst_entry *) dst;
1009 }
1010 
1011 static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst)
1012 {
1013 #ifdef CONFIG_XFRM
1014         if (dst->xfrm) {
1015                 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
1016                 return xdst->child;
1017         }
1018 #endif
1019         return NULL;
1020 }
1021 
1022 #ifdef CONFIG_XFRM
1023 static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child)
1024 {
1025         xdst->child = child;
1026 }
1027 
1028 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
1029 {
1030         xfrm_pols_put(xdst->pols, xdst->num_pols);
1031         dst_release(xdst->route);
1032         if (likely(xdst->u.dst.xfrm))
1033                 xfrm_state_put(xdst->u.dst.xfrm);
1034 }
1035 #endif
1036 
1037 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
1038 
1039 struct xfrm_offload {
1040         /* Output sequence number for replay protection on offloading. */
1041         struct {
1042                 __u32 low;
1043                 __u32 hi;
1044         } seq;
1045 
1046         __u32                   flags;
1047 #define SA_DELETE_REQ           1
1048 #define CRYPTO_DONE             2
1049 #define CRYPTO_NEXT_DONE        4
1050 #define CRYPTO_FALLBACK         8
1051 #define XFRM_GSO_SEGMENT        16
1052 #define XFRM_GRO                32
1053 #define XFRM_ESP_NO_TRAILER     64
1054 #define XFRM_DEV_RESUME         128
1055 
1056         __u32                   status;
1057 #define CRYPTO_SUCCESS                          1
1058 #define CRYPTO_GENERIC_ERROR                    2
1059 #define CRYPTO_TRANSPORT_AH_AUTH_FAILED         4
1060 #define CRYPTO_TRANSPORT_ESP_AUTH_FAILED        8
1061 #define CRYPTO_TUNNEL_AH_AUTH_FAILED            16
1062 #define CRYPTO_TUNNEL_ESP_AUTH_FAILED           32
1063 #define CRYPTO_INVALID_PACKET_SYNTAX            64
1064 #define CRYPTO_INVALID_PROTOCOL                 128
1065 
1066         __u8                    proto;
1067 };
1068 
1069 struct sec_path {
1070         refcount_t              refcnt;
1071         int                     len;
1072         int                     olen;
1073 
1074         struct xfrm_state       *xvec[XFRM_MAX_DEPTH];
1075         struct xfrm_offload     ovec[XFRM_MAX_OFFLOAD_DEPTH];
1076 };
1077 
1078 static inline int secpath_exists(struct sk_buff *skb)
1079 {
1080 #ifdef CONFIG_XFRM
1081         return skb->sp != NULL;
1082 #else
1083         return 0;
1084 #endif
1085 }
1086 
1087 static inline struct sec_path *
1088 secpath_get(struct sec_path *sp)
1089 {
1090         if (sp)
1091                 refcount_inc(&sp->refcnt);
1092         return sp;
1093 }
1094 
1095 void __secpath_destroy(struct sec_path *sp);
1096 
1097 static inline void
1098 secpath_put(struct sec_path *sp)
1099 {
1100         if (sp && refcount_dec_and_test(&sp->refcnt))
1101                 __secpath_destroy(sp);
1102 }
1103 
1104 struct sec_path *secpath_dup(struct sec_path *src);
1105 int secpath_set(struct sk_buff *skb);
1106 
1107 static inline void
1108 secpath_reset(struct sk_buff *skb)
1109 {
1110 #ifdef CONFIG_XFRM
1111         secpath_put(skb->sp);
1112         skb->sp = NULL;
1113 #endif
1114 }
1115 
1116 static inline int
1117 xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
1118 {
1119         switch (family) {
1120         case AF_INET:
1121                 return addr->a4 == 0;
1122         case AF_INET6:
1123                 return ipv6_addr_any(&addr->in6);
1124         }
1125         return 0;
1126 }
1127 
1128 static inline int
1129 __xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1130 {
1131         return  (tmpl->saddr.a4 &&
1132                  tmpl->saddr.a4 != x->props.saddr.a4);
1133 }
1134 
1135 static inline int
1136 __xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
1137 {
1138         return  (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
1139                  !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
1140 }
1141 
1142 static inline int
1143 xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
1144 {
1145         switch (family) {
1146         case AF_INET:
1147                 return __xfrm4_state_addr_cmp(tmpl, x);
1148         case AF_INET6:
1149                 return __xfrm6_state_addr_cmp(tmpl, x);
1150         }
1151         return !0;
1152 }
1153 
1154 #ifdef CONFIG_XFRM
1155 int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
1156                         unsigned short family);
1157 
1158 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
1159                                        struct sk_buff *skb,
1160                                        unsigned int family, int reverse)
1161 {
1162         struct net *net = dev_net(skb->dev);
1163         int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
1164 
1165         if (sk && sk->sk_policy[XFRM_POLICY_IN])
1166                 return __xfrm_policy_check(sk, ndir, skb, family);
1167 
1168         return  (!net->xfrm.policy_count[dir] && !skb->sp) ||
1169                 (skb_dst(skb)->flags & DST_NOPOLICY) ||
1170                 __xfrm_policy_check(sk, ndir, skb, family);
1171 }
1172 
1173 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1174 {
1175         return __xfrm_policy_check2(sk, dir, skb, family, 0);
1176 }
1177 
1178 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1179 {
1180         return xfrm_policy_check(sk, dir, skb, AF_INET);
1181 }
1182 
1183 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1184 {
1185         return xfrm_policy_check(sk, dir, skb, AF_INET6);
1186 }
1187 
1188 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1189                                              struct sk_buff *skb)
1190 {
1191         return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1192 }
1193 
1194 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1195                                              struct sk_buff *skb)
1196 {
1197         return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1198 }
1199 
1200 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1201                           unsigned int family, int reverse);
1202 
1203 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1204                                       unsigned int family)
1205 {
1206         return __xfrm_decode_session(skb, fl, family, 0);
1207 }
1208 
1209 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1210                                               struct flowi *fl,
1211                                               unsigned int family)
1212 {
1213         return __xfrm_decode_session(skb, fl, family, 1);
1214 }
1215 
1216 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1217 
1218 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1219 {
1220         struct net *net = dev_net(skb->dev);
1221 
1222         return  !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
1223                 (skb_dst(skb)->flags & DST_NOXFRM) ||
1224                 __xfrm_route_forward(skb, family);
1225 }
1226 
1227 static inline int xfrm4_route_forward(struct sk_buff *skb)
1228 {
1229         return xfrm_route_forward(skb, AF_INET);
1230 }
1231 
1232 static inline int xfrm6_route_forward(struct sk_buff *skb)
1233 {
1234         return xfrm_route_forward(skb, AF_INET6);
1235 }
1236 
1237 int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);
1238 
1239 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1240 {
1241         sk->sk_policy[0] = NULL;
1242         sk->sk_policy[1] = NULL;
1243         if (unlikely(osk->sk_policy[0] || osk->sk_policy[1]))
1244                 return __xfrm_sk_clone_policy(sk, osk);
1245         return 0;
1246 }
1247 
1248 int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1249 
1250 static inline void xfrm_sk_free_policy(struct sock *sk)
1251 {
1252         struct xfrm_policy *pol;
1253 
1254         pol = rcu_dereference_protected(sk->sk_policy[0], 1);
1255         if (unlikely(pol != NULL)) {
1256                 xfrm_policy_delete(pol, XFRM_POLICY_MAX);
1257                 sk->sk_policy[0] = NULL;
1258         }
1259         pol = rcu_dereference_protected(sk->sk_policy[1], 1);
1260         if (unlikely(pol != NULL)) {
1261                 xfrm_policy_delete(pol, XFRM_POLICY_MAX+1);
1262                 sk->sk_policy[1] = NULL;
1263         }
1264 }
1265 
1266 #else
1267 
1268 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1269 static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }
1270 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }  
1271 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 
1272 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1273 { 
1274         return 1; 
1275 } 
1276 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1277 {
1278         return 1;
1279 }
1280 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1281 {
1282         return 1;
1283 }
1284 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1285                                               struct flowi *fl,
1286                                               unsigned int family)
1287 {
1288         return -ENOSYS;
1289 }
1290 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1291                                              struct sk_buff *skb)
1292 {
1293         return 1;
1294 }
1295 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1296                                              struct sk_buff *skb)
1297 {
1298         return 1;
1299 }
1300 #endif
1301 
1302 static __inline__
1303 xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
1304 {
1305         switch (family){
1306         case AF_INET:
1307                 return (xfrm_address_t *)&fl->u.ip4.daddr;
1308         case AF_INET6:
1309                 return (xfrm_address_t *)&fl->u.ip6.daddr;
1310         }
1311         return NULL;
1312 }
1313 
1314 static __inline__
1315 xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
1316 {
1317         switch (family){
1318         case AF_INET:
1319                 return (xfrm_address_t *)&fl->u.ip4.saddr;
1320         case AF_INET6:
1321                 return (xfrm_address_t *)&fl->u.ip6.saddr;
1322         }
1323         return NULL;
1324 }
1325 
1326 static __inline__
1327 void xfrm_flowi_addr_get(const struct flowi *fl,
1328                          xfrm_address_t *saddr, xfrm_address_t *daddr,
1329                          unsigned short family)
1330 {
1331         switch(family) {
1332         case AF_INET:
1333                 memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
1334                 memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
1335                 break;
1336         case AF_INET6:
1337                 saddr->in6 = fl->u.ip6.saddr;
1338                 daddr->in6 = fl->u.ip6.daddr;
1339                 break;
1340         }
1341 }
1342 
1343 static __inline__ int
1344 __xfrm4_state_addr_check(const struct xfrm_state *x,
1345                          const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1346 {
1347         if (daddr->a4 == x->id.daddr.a4 &&
1348             (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1349                 return 1;
1350         return 0;
1351 }
1352 
1353 static __inline__ int
1354 __xfrm6_state_addr_check(const struct xfrm_state *x,
1355                          const xfrm_address_t *daddr, const xfrm_address_t *saddr)
1356 {
1357         if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1358             (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
1359              ipv6_addr_any((struct in6_addr *)saddr) || 
1360              ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1361                 return 1;
1362         return 0;
1363 }
1364 
1365 static __inline__ int
1366 xfrm_state_addr_check(const struct xfrm_state *x,
1367                       const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1368                       unsigned short family)
1369 {
1370         switch (family) {
1371         case AF_INET:
1372                 return __xfrm4_state_addr_check(x, daddr, saddr);
1373         case AF_INET6:
1374                 return __xfrm6_state_addr_check(x, daddr, saddr);
1375         }
1376         return 0;
1377 }
1378 
1379 static __inline__ int
1380 xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
1381                            unsigned short family)
1382 {
1383         switch (family) {
1384         case AF_INET:
1385                 return __xfrm4_state_addr_check(x,
1386                                                 (const xfrm_address_t *)&fl->u.ip4.daddr,
1387                                                 (const xfrm_address_t *)&fl->u.ip4.saddr);
1388         case AF_INET6:
1389                 return __xfrm6_state_addr_check(x,
1390                                                 (const xfrm_address_t *)&fl->u.ip6.daddr,
1391                                                 (const xfrm_address_t *)&fl->u.ip6.saddr);
1392         }
1393         return 0;
1394 }
1395 
1396 static inline int xfrm_state_kern(const struct xfrm_state *x)
1397 {
1398         return atomic_read(&x->tunnel_users);
1399 }
1400 
1401 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1402 {
1403         return (!userproto || proto == userproto ||
1404                 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1405                                                   proto == IPPROTO_ESP ||
1406                                                   proto == IPPROTO_COMP)));
1407 }
1408 
1409 /*
1410  * xfrm algorithm information
1411  */
1412 struct xfrm_algo_aead_info {
1413         char *geniv;
1414         u16 icv_truncbits;
1415 };
1416 
1417 struct xfrm_algo_auth_info {
1418         u16 icv_truncbits;
1419         u16 icv_fullbits;
1420 };
1421 
1422 struct xfrm_algo_encr_info {
1423         char *geniv;
1424         u16 blockbits;
1425         u16 defkeybits;
1426 };
1427 
1428 struct xfrm_algo_comp_info {
1429         u16 threshold;
1430 };
1431 
1432 struct xfrm_algo_desc {
1433         char *name;
1434         char *compat;
1435         u8 available:1;
1436         u8 pfkey_supported:1;
1437         union {
1438                 struct xfrm_algo_aead_info aead;
1439                 struct xfrm_algo_auth_info auth;
1440                 struct xfrm_algo_encr_info encr;
1441                 struct xfrm_algo_comp_info comp;
1442         } uinfo;
1443         struct sadb_alg desc;
1444 };
1445 
1446 /* XFRM protocol handlers.  */
1447 struct xfrm4_protocol {
1448         int (*handler)(struct sk_buff *skb);
1449         int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
1450                              int encap_type);
1451         int (*cb_handler)(struct sk_buff *skb, int err);
1452         int (*err_handler)(struct sk_buff *skb, u32 info);
1453 
1454         struct xfrm4_protocol __rcu *next;
1455         int priority;
1456 };
1457 
1458 struct xfrm6_protocol {
1459         int (*handler)(struct sk_buff *skb);
1460         int (*cb_handler)(struct sk_buff *skb, int err);
1461         int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1462                            u8 type, u8 code, int offset, __be32 info);
1463 
1464         struct xfrm6_protocol __rcu *next;
1465         int priority;
1466 };
1467 
1468 /* XFRM tunnel handlers.  */
1469 struct xfrm_tunnel {
1470         int (*handler)(struct sk_buff *skb);
1471         int (*err_handler)(struct sk_buff *skb, u32 info);
1472 
1473         struct xfrm_tunnel __rcu *next;
1474         int priority;
1475 };
1476 
1477 struct xfrm6_tunnel {
1478         int (*handler)(struct sk_buff *skb);
1479         int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1480                            u8 type, u8 code, int offset, __be32 info);
1481         struct xfrm6_tunnel __rcu *next;
1482         int priority;
1483 };
1484 
1485 void xfrm_init(void);
1486 void xfrm4_init(void);
1487 int xfrm_state_init(struct net *net);
1488 void xfrm_state_fini(struct net *net);
1489 void xfrm4_state_init(void);
1490 void xfrm4_protocol_init(void);
1491 #ifdef CONFIG_XFRM
1492 int xfrm6_init(void);
1493 void xfrm6_fini(void);
1494 int xfrm6_state_init(void);
1495 void xfrm6_state_fini(void);
1496 int xfrm6_protocol_init(void);
1497 void xfrm6_protocol_fini(void);
1498 #else
1499 static inline int xfrm6_init(void)
1500 {
1501         return 0;
1502 }
1503 static inline void xfrm6_fini(void)
1504 {
1505         ;
1506 }
1507 #endif
1508 
1509 #ifdef CONFIG_XFRM_STATISTICS
1510 int xfrm_proc_init(struct net *net);
1511 void xfrm_proc_fini(struct net *net);
1512 #endif
1513 
1514 int xfrm_sysctl_init(struct net *net);
1515 #ifdef CONFIG_SYSCTL
1516 void xfrm_sysctl_fini(struct net *net);
1517 #else
1518 static inline void xfrm_sysctl_fini(struct net *net)
1519 {
1520 }
1521 #endif
1522 
1523 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1524                           struct xfrm_address_filter *filter);
1525 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1526                     int (*func)(struct xfrm_state *, int, void*), void *);
1527 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
1528 struct xfrm_state *xfrm_state_alloc(struct net *net);
1529 struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
1530                                    const xfrm_address_t *saddr,
1531                                    const struct flowi *fl,
1532                                    struct xfrm_tmpl *tmpl,
1533                                    struct xfrm_policy *pol, int *err,
1534                                    unsigned short family);
1535 struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
1536                                        xfrm_address_t *daddr,
1537                                        xfrm_address_t *saddr,
1538                                        unsigned short family,
1539                                        u8 mode, u8 proto, u32 reqid);
1540 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1541                                               unsigned short family);
1542 int xfrm_state_check_expire(struct xfrm_state *x);
1543 void xfrm_state_insert(struct xfrm_state *x);
1544 int xfrm_state_add(struct xfrm_state *x);
1545 int xfrm_state_update(struct xfrm_state *x);
1546 struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
1547                                      const xfrm_address_t *daddr, __be32 spi,
1548                                      u8 proto, unsigned short family);
1549 struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1550                                             const xfrm_address_t *daddr,
1551                                             const xfrm_address_t *saddr,
1552                                             u8 proto,
1553                                             unsigned short family);
1554 #ifdef CONFIG_XFRM_SUB_POLICY
1555 int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1556                    unsigned short family, struct net *net);
1557 int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1558                     unsigned short family);
1559 #else
1560 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1561                                  int n, unsigned short family, struct net *net)
1562 {
1563         return -ENOSYS;
1564 }
1565 
1566 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1567                                   int n, unsigned short family)
1568 {
1569         return -ENOSYS;
1570 }
1571 #endif
1572 
1573 struct xfrmk_sadinfo {
1574         u32 sadhcnt; /* current hash bkts */
1575         u32 sadhmcnt; /* max allowed hash bkts */
1576         u32 sadcnt; /* current running count */
1577 };
1578 
1579 struct xfrmk_spdinfo {
1580         u32 incnt;
1581         u32 outcnt;
1582         u32 fwdcnt;
1583         u32 inscnt;
1584         u32 outscnt;
1585         u32 fwdscnt;
1586         u32 spdhcnt;
1587         u32 spdhmcnt;
1588 };
1589 
1590 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1591 int xfrm_state_delete(struct xfrm_state *x);
1592 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid);
1593 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
1594 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
1595 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
1596 u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
1597 int xfrm_init_replay(struct xfrm_state *x);
1598 int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1599 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload);
1600 int xfrm_init_state(struct xfrm_state *x);
1601 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1602 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
1603 int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1604 int xfrm_trans_queue(struct sk_buff *skb,
1605                      int (*finish)(struct net *, struct sock *,
1606                                    struct sk_buff *));
1607 int xfrm_output_resume(struct sk_buff *skb, int err);
1608 int xfrm_output(struct sock *sk, struct sk_buff *skb);
1609 int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1610 void xfrm_local_error(struct sk_buff *skb, int mtu);
1611 int xfrm4_extract_header(struct sk_buff *skb);
1612 int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1613 int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1614                     int encap_type);
1615 int xfrm4_transport_finish(struct sk_buff *skb, int async);
1616 int xfrm4_rcv(struct sk_buff *skb);
1617 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1618 
1619 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1620 {
1621         XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
1622         XFRM_SPI_SKB_CB(skb)->family = AF_INET;
1623         XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
1624         return xfrm_input(skb, nexthdr, spi, 0);
1625 }
1626 
1627 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1628 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1629 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1630 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
1631 int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1632 int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
1633 int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
1634 int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1635 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1636 void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
1637 int xfrm6_extract_header(struct sk_buff *skb);
1638 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1639 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
1640                   struct ip6_tnl *t);
1641 int xfrm6_transport_finish(struct sk_buff *skb, int async);
1642 int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);
1643 int xfrm6_rcv(struct sk_buff *skb);
1644 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1645                      xfrm_address_t *saddr, u8 proto);
1646 void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
1647 int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
1648 int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
1649 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
1650 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1651 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1652 __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
1653 __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
1654 int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1655 int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1656 int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1657 int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
1658 int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1659                           u8 **prevhdr);
1660 
1661 #ifdef CONFIG_XFRM
1662 int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1663 int xfrm_user_policy(struct sock *sk, int optname,
1664                      u8 __user *optval, int optlen);
1665 #else
1666 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1667 {
1668         return -ENOPROTOOPT;
1669 } 
1670 
1671 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1672 {
1673         /* should not happen */
1674         kfree_skb(skb);
1675         return 0;
1676 }
1677 #endif
1678 
1679 struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
1680                                     const xfrm_address_t *saddr,
1681                                     const xfrm_address_t *daddr,
1682                                     int family, u32 mark);
1683 
1684 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
1685 
1686 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1687 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
1688                      int (*func)(struct xfrm_policy *, int, int, void*),
1689                      void *);
1690 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
1691 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1692 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
1693                                           u8 type, int dir,
1694                                           struct xfrm_selector *sel,
1695                                           struct xfrm_sec_ctx *ctx, int delete,
1696                                           int *err);
1697 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
1698                                      u32 id, int delete, int *err);
1699 int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
1700 void xfrm_policy_hash_rebuild(struct net *net);
1701 u32 xfrm_get_acqseq(void);
1702 int verify_spi_info(u8 proto, u32 min, u32 max);
1703 int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1704 struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
1705                                  u8 mode, u32 reqid, u8 proto,
1706                                  const xfrm_address_t *daddr,
1707                                  const xfrm_address_t *saddr, int create,
1708                                  unsigned short family);
1709 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1710 
1711 #ifdef CONFIG_XFRM_MIGRATE
1712 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1713                const struct xfrm_migrate *m, int num_bundles,
1714                const struct xfrm_kmaddress *k,
1715                const struct xfrm_encap_tmpl *encap);
1716 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
1717 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1718                                       struct xfrm_migrate *m,
1719                                       struct xfrm_encap_tmpl *encap);
1720 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1721                  struct xfrm_migrate *m, int num_bundles,
1722                  struct xfrm_kmaddress *k, struct net *net,
1723                  struct xfrm_encap_tmpl *encap);
1724 #endif
1725 
1726 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1727 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
1728 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
1729               xfrm_address_t *addr);
1730 
1731 void xfrm_input_init(void);
1732 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1733 
1734 void xfrm_probe_algs(void);
1735 int xfrm_count_pfkey_auth_supported(void);
1736 int xfrm_count_pfkey_enc_supported(void);
1737 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1738 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1739 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1740 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1741 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1742 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
1743 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
1744 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
1745 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
1746                                             int probe);
1747 
1748 static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
1749                                     const xfrm_address_t *b)
1750 {
1751         return ipv6_addr_equal((const struct in6_addr *)a,
1752                                (const struct in6_addr *)b);
1753 }
1754 
1755 static inline bool xfrm_addr_equal(const xfrm_address_t *a,
1756                                    const xfrm_address_t *b,
1757                                    sa_family_t family)
1758 {
1759         switch (family) {
1760         default:
1761         case AF_INET:
1762                 return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
1763         case AF_INET6:
1764                 return xfrm6_addr_equal(a, b);
1765         }
1766 }
1767 
1768 static inline int xfrm_policy_id2dir(u32 index)
1769 {
1770         return index & 7;
1771 }
1772 
1773 #ifdef CONFIG_XFRM
1774 static inline int xfrm_aevent_is_on(struct net *net)
1775 {
1776         struct sock *nlsk;
1777         int ret = 0;
1778 
1779         rcu_read_lock();
1780         nlsk = rcu_dereference(net->xfrm.nlsk);
1781         if (nlsk)
1782                 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1783         rcu_read_unlock();
1784         return ret;
1785 }
1786 
1787 static inline int xfrm_acquire_is_on(struct net *net)
1788 {
1789         struct sock *nlsk;
1790         int ret = 0;
1791 
1792         rcu_read_lock();
1793         nlsk = rcu_dereference(net->xfrm.nlsk);
1794         if (nlsk)
1795                 ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
1796         rcu_read_unlock();
1797 
1798         return ret;
1799 }
1800 #endif
1801 
1802 static inline unsigned int aead_len(struct xfrm_algo_aead *alg)
1803 {
1804         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1805 }
1806 
1807 static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
1808 {
1809         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1810 }
1811 
1812 static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
1813 {
1814         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1815 }
1816 
1817 static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
1818 {
1819         return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
1820 }
1821 
1822 #ifdef CONFIG_XFRM_MIGRATE
1823 static inline int xfrm_replay_clone(struct xfrm_state *x,
1824                                      struct xfrm_state *orig)
1825 {
1826         x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
1827                                 GFP_KERNEL);
1828         if (!x->replay_esn)
1829                 return -ENOMEM;
1830 
1831         x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
1832         x->replay_esn->replay_window = orig->replay_esn->replay_window;
1833 
1834         x->preplay_esn = kmemdup(x->replay_esn,
1835                                  xfrm_replay_state_esn_len(x->replay_esn),
1836                                  GFP_KERNEL);
1837         if (!x->preplay_esn) {
1838                 kfree(x->replay_esn);
1839                 return -ENOMEM;
1840         }
1841 
1842         return 0;
1843 }
1844 
1845 static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
1846 {
1847         return kmemdup(orig, aead_len(orig), GFP_KERNEL);
1848 }
1849 
1850 
1851 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1852 {
1853         return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1854 }
1855 
1856 static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1857 {
1858         return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1859 }
1860 
1861 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1862 {
1863         int i;
1864         for (i = 0; i < n; i++)
1865                 xfrm_state_put(*(states + i));
1866 }
1867 
1868 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1869 {
1870         int i;
1871         for (i = 0; i < n; i++)
1872                 xfrm_state_delete(*(states + i));
1873 }
1874 #endif
1875 
1876 #ifdef CONFIG_XFRM
1877 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1878 {
1879         return skb->sp->xvec[skb->sp->len - 1];
1880 }
1881 #endif
1882 
1883 static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb)
1884 {
1885 #ifdef CONFIG_XFRM
1886         struct sec_path *sp = skb->sp;
1887 
1888         if (!sp || !sp->olen || sp->len != sp->olen)
1889                 return NULL;
1890 
1891         return &sp->ovec[sp->olen - 1];
1892 #else
1893         return NULL;
1894 #endif
1895 }
1896 
1897 void __net_init xfrm_dev_init(void);
1898 
1899 #ifdef CONFIG_XFRM_OFFLOAD
1900 void xfrm_dev_resume(struct sk_buff *skb);
1901 void xfrm_dev_backlog(struct softnet_data *sd);
1902 struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again);
1903 int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
1904                        struct xfrm_user_offload *xuo);
1905 bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
1906 
1907 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1908 {
1909         struct xfrm_state_offload *xso = &x->xso;
1910 
1911         if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn)
1912                 xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x);
1913 }
1914 
1915 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1916 {
1917         struct xfrm_state *x = dst->xfrm;
1918         struct xfrm_dst *xdst;
1919 
1920         if (!x || !x->type_offload)
1921                 return false;
1922 
1923         xdst = (struct xfrm_dst *) dst;
1924         if (!x->xso.offload_handle && !xdst->child->xfrm)
1925                 return true;
1926         if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) &&
1927             !xdst->child->xfrm)
1928                 return true;
1929 
1930         return false;
1931 }
1932 
1933 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1934 {
1935         struct xfrm_state_offload *xso = &x->xso;
1936 
1937         if (xso->dev)
1938                 xso->dev->xfrmdev_ops->xdo_dev_state_delete(x);
1939 }
1940 
1941 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1942 {
1943         struct xfrm_state_offload *xso = &x->xso;
1944          struct net_device *dev = xso->dev;
1945 
1946         if (dev && dev->xfrmdev_ops) {
1947                 if (dev->xfrmdev_ops->xdo_dev_state_free)
1948                         dev->xfrmdev_ops->xdo_dev_state_free(x);
1949                 xso->dev = NULL;
1950                 dev_put(dev);
1951         }
1952 }
1953 #else
1954 static inline void xfrm_dev_resume(struct sk_buff *skb)
1955 {
1956 }
1957 
1958 static inline void xfrm_dev_backlog(struct softnet_data *sd)
1959 {
1960 }
1961 
1962 static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
1963 {
1964         return skb;
1965 }
1966 
1967 static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo)
1968 {
1969         return 0;
1970 }
1971 
1972 static inline void xfrm_dev_state_delete(struct xfrm_state *x)
1973 {
1974 }
1975 
1976 static inline void xfrm_dev_state_free(struct xfrm_state *x)
1977 {
1978 }
1979 
1980 static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
1981 {
1982         return false;
1983 }
1984 
1985 static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x)
1986 {
1987 }
1988 
1989 static inline bool xfrm_dst_offload_ok(struct dst_entry *dst)
1990 {
1991         return false;
1992 }
1993 #endif
1994 
1995 static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
1996 {
1997         if (attrs[XFRMA_MARK])
1998                 memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
1999         else
2000                 m->v = m->m = 0;
2001 
2002         return m->v & m->m;
2003 }
2004 
2005 static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
2006 {
2007         int ret = 0;
2008 
2009         if (m->m | m->v)
2010                 ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
2011         return ret;
2012 }
2013 
2014 static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
2015                                     unsigned int family)
2016 {
2017         bool tunnel = false;
2018 
2019         switch(family) {
2020         case AF_INET:
2021                 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
2022                         tunnel = true;
2023                 break;
2024         case AF_INET6:
2025                 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
2026                         tunnel = true;
2027                 break;
2028         }
2029         if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
2030                 return -EINVAL;
2031 
2032         return 0;
2033 }
2034 #endif  /* _NET_XFRM_H */
2035 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp