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TOMOYO Linux Cross Reference
Linux/net/xfrm/xfrm_state.c

Version: ~ [ linux-4.17-rc6 ] ~ [ linux-4.16.10 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.42 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.101 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.132 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.51 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.109 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.56 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.101 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.27.62 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * xfrm_state.c
  3  *
  4  * Changes:
  5  *      Mitsuru KANDA @USAGI
  6  *      Kazunori MIYAZAWA @USAGI
  7  *      Kunihiro Ishiguro <kunihiro@ipinfusion.com>
  8  *              IPv6 support
  9  *      YOSHIFUJI Hideaki @USAGI
 10  *              Split up af-specific functions
 11  *      Derek Atkins <derek@ihtfp.com>
 12  *              Add UDP Encapsulation
 13  *
 14  */
 15 
 16 #include <linux/workqueue.h>
 17 #include <net/xfrm.h>
 18 #include <linux/pfkeyv2.h>
 19 #include <linux/ipsec.h>
 20 #include <linux/module.h>
 21 #include <linux/cache.h>
 22 #include <linux/audit.h>
 23 #include <linux/uaccess.h>
 24 #include <linux/ktime.h>
 25 #include <linux/slab.h>
 26 #include <linux/interrupt.h>
 27 #include <linux/kernel.h>
 28 
 29 #include "xfrm_hash.h"
 30 
 31 #define xfrm_state_deref_prot(table, net) \
 32         rcu_dereference_protected((table), lockdep_is_held(&(net)->xfrm.xfrm_state_lock))
 33 
 34 static void xfrm_state_gc_task(struct work_struct *work);
 35 
 36 /* Each xfrm_state may be linked to two tables:
 37 
 38    1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
 39    2. Hash table by (daddr,family,reqid) to find what SAs exist for given
 40       destination/tunnel endpoint. (output)
 41  */
 42 
 43 static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
 44 static __read_mostly seqcount_t xfrm_state_hash_generation = SEQCNT_ZERO(xfrm_state_hash_generation);
 45 
 46 static DECLARE_WORK(xfrm_state_gc_work, xfrm_state_gc_task);
 47 static HLIST_HEAD(xfrm_state_gc_list);
 48 
 49 static inline bool xfrm_state_hold_rcu(struct xfrm_state __rcu *x)
 50 {
 51         return refcount_inc_not_zero(&x->refcnt);
 52 }
 53 
 54 static inline unsigned int xfrm_dst_hash(struct net *net,
 55                                          const xfrm_address_t *daddr,
 56                                          const xfrm_address_t *saddr,
 57                                          u32 reqid,
 58                                          unsigned short family)
 59 {
 60         return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
 61 }
 62 
 63 static inline unsigned int xfrm_src_hash(struct net *net,
 64                                          const xfrm_address_t *daddr,
 65                                          const xfrm_address_t *saddr,
 66                                          unsigned short family)
 67 {
 68         return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
 69 }
 70 
 71 static inline unsigned int
 72 xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr,
 73               __be32 spi, u8 proto, unsigned short family)
 74 {
 75         return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
 76 }
 77 
 78 static void xfrm_hash_transfer(struct hlist_head *list,
 79                                struct hlist_head *ndsttable,
 80                                struct hlist_head *nsrctable,
 81                                struct hlist_head *nspitable,
 82                                unsigned int nhashmask)
 83 {
 84         struct hlist_node *tmp;
 85         struct xfrm_state *x;
 86 
 87         hlist_for_each_entry_safe(x, tmp, list, bydst) {
 88                 unsigned int h;
 89 
 90                 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
 91                                     x->props.reqid, x->props.family,
 92                                     nhashmask);
 93                 hlist_add_head_rcu(&x->bydst, ndsttable + h);
 94 
 95                 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
 96                                     x->props.family,
 97                                     nhashmask);
 98                 hlist_add_head_rcu(&x->bysrc, nsrctable + h);
 99 
100                 if (x->id.spi) {
101                         h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
102                                             x->id.proto, x->props.family,
103                                             nhashmask);
104                         hlist_add_head_rcu(&x->byspi, nspitable + h);
105                 }
106         }
107 }
108 
109 static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
110 {
111         return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
112 }
113 
114 static void xfrm_hash_resize(struct work_struct *work)
115 {
116         struct net *net = container_of(work, struct net, xfrm.state_hash_work);
117         struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
118         unsigned long nsize, osize;
119         unsigned int nhashmask, ohashmask;
120         int i;
121 
122         nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
123         ndst = xfrm_hash_alloc(nsize);
124         if (!ndst)
125                 return;
126         nsrc = xfrm_hash_alloc(nsize);
127         if (!nsrc) {
128                 xfrm_hash_free(ndst, nsize);
129                 return;
130         }
131         nspi = xfrm_hash_alloc(nsize);
132         if (!nspi) {
133                 xfrm_hash_free(ndst, nsize);
134                 xfrm_hash_free(nsrc, nsize);
135                 return;
136         }
137 
138         spin_lock_bh(&net->xfrm.xfrm_state_lock);
139         write_seqcount_begin(&xfrm_state_hash_generation);
140 
141         nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
142         odst = xfrm_state_deref_prot(net->xfrm.state_bydst, net);
143         for (i = net->xfrm.state_hmask; i >= 0; i--)
144                 xfrm_hash_transfer(odst + i, ndst, nsrc, nspi, nhashmask);
145 
146         osrc = xfrm_state_deref_prot(net->xfrm.state_bysrc, net);
147         ospi = xfrm_state_deref_prot(net->xfrm.state_byspi, net);
148         ohashmask = net->xfrm.state_hmask;
149 
150         rcu_assign_pointer(net->xfrm.state_bydst, ndst);
151         rcu_assign_pointer(net->xfrm.state_bysrc, nsrc);
152         rcu_assign_pointer(net->xfrm.state_byspi, nspi);
153         net->xfrm.state_hmask = nhashmask;
154 
155         write_seqcount_end(&xfrm_state_hash_generation);
156         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
157 
158         osize = (ohashmask + 1) * sizeof(struct hlist_head);
159 
160         synchronize_rcu();
161 
162         xfrm_hash_free(odst, osize);
163         xfrm_hash_free(osrc, osize);
164         xfrm_hash_free(ospi, osize);
165 }
166 
167 static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
168 static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO];
169 
170 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
171 
172 int __xfrm_state_delete(struct xfrm_state *x);
173 
174 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
175 bool km_is_alive(const struct km_event *c);
176 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
177 
178 static DEFINE_SPINLOCK(xfrm_type_lock);
179 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
180 {
181         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
182         const struct xfrm_type **typemap;
183         int err = 0;
184 
185         if (unlikely(afinfo == NULL))
186                 return -EAFNOSUPPORT;
187         typemap = afinfo->type_map;
188         spin_lock_bh(&xfrm_type_lock);
189 
190         if (likely(typemap[type->proto] == NULL))
191                 typemap[type->proto] = type;
192         else
193                 err = -EEXIST;
194         spin_unlock_bh(&xfrm_type_lock);
195         rcu_read_unlock();
196         return err;
197 }
198 EXPORT_SYMBOL(xfrm_register_type);
199 
200 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
201 {
202         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
203         const struct xfrm_type **typemap;
204         int err = 0;
205 
206         if (unlikely(afinfo == NULL))
207                 return -EAFNOSUPPORT;
208         typemap = afinfo->type_map;
209         spin_lock_bh(&xfrm_type_lock);
210 
211         if (unlikely(typemap[type->proto] != type))
212                 err = -ENOENT;
213         else
214                 typemap[type->proto] = NULL;
215         spin_unlock_bh(&xfrm_type_lock);
216         rcu_read_unlock();
217         return err;
218 }
219 EXPORT_SYMBOL(xfrm_unregister_type);
220 
221 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
222 {
223         struct xfrm_state_afinfo *afinfo;
224         const struct xfrm_type **typemap;
225         const struct xfrm_type *type;
226         int modload_attempted = 0;
227 
228 retry:
229         afinfo = xfrm_state_get_afinfo(family);
230         if (unlikely(afinfo == NULL))
231                 return NULL;
232         typemap = afinfo->type_map;
233 
234         type = READ_ONCE(typemap[proto]);
235         if (unlikely(type && !try_module_get(type->owner)))
236                 type = NULL;
237 
238         rcu_read_unlock();
239 
240         if (!type && !modload_attempted) {
241                 request_module("xfrm-type-%d-%d", family, proto);
242                 modload_attempted = 1;
243                 goto retry;
244         }
245 
246         return type;
247 }
248 
249 static void xfrm_put_type(const struct xfrm_type *type)
250 {
251         module_put(type->owner);
252 }
253 
254 static DEFINE_SPINLOCK(xfrm_type_offload_lock);
255 int xfrm_register_type_offload(const struct xfrm_type_offload *type,
256                                unsigned short family)
257 {
258         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
259         const struct xfrm_type_offload **typemap;
260         int err = 0;
261 
262         if (unlikely(afinfo == NULL))
263                 return -EAFNOSUPPORT;
264         typemap = afinfo->type_offload_map;
265         spin_lock_bh(&xfrm_type_offload_lock);
266 
267         if (likely(typemap[type->proto] == NULL))
268                 typemap[type->proto] = type;
269         else
270                 err = -EEXIST;
271         spin_unlock_bh(&xfrm_type_offload_lock);
272         rcu_read_unlock();
273         return err;
274 }
275 EXPORT_SYMBOL(xfrm_register_type_offload);
276 
277 int xfrm_unregister_type_offload(const struct xfrm_type_offload *type,
278                                  unsigned short family)
279 {
280         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
281         const struct xfrm_type_offload **typemap;
282         int err = 0;
283 
284         if (unlikely(afinfo == NULL))
285                 return -EAFNOSUPPORT;
286         typemap = afinfo->type_offload_map;
287         spin_lock_bh(&xfrm_type_offload_lock);
288 
289         if (unlikely(typemap[type->proto] != type))
290                 err = -ENOENT;
291         else
292                 typemap[type->proto] = NULL;
293         spin_unlock_bh(&xfrm_type_offload_lock);
294         rcu_read_unlock();
295         return err;
296 }
297 EXPORT_SYMBOL(xfrm_unregister_type_offload);
298 
299 static const struct xfrm_type_offload *
300 xfrm_get_type_offload(u8 proto, unsigned short family, bool try_load)
301 {
302         struct xfrm_state_afinfo *afinfo;
303         const struct xfrm_type_offload **typemap;
304         const struct xfrm_type_offload *type;
305 
306 retry:
307         afinfo = xfrm_state_get_afinfo(family);
308         if (unlikely(afinfo == NULL))
309                 return NULL;
310         typemap = afinfo->type_offload_map;
311 
312         type = typemap[proto];
313         if ((type && !try_module_get(type->owner)))
314                 type = NULL;
315 
316         rcu_read_unlock();
317 
318         if (!type && try_load) {
319                 request_module("xfrm-offload-%d-%d", family, proto);
320                 try_load = false;
321                 goto retry;
322         }
323 
324         return type;
325 }
326 
327 static void xfrm_put_type_offload(const struct xfrm_type_offload *type)
328 {
329         module_put(type->owner);
330 }
331 
332 static DEFINE_SPINLOCK(xfrm_mode_lock);
333 int xfrm_register_mode(struct xfrm_mode *mode, int family)
334 {
335         struct xfrm_state_afinfo *afinfo;
336         struct xfrm_mode **modemap;
337         int err;
338 
339         if (unlikely(mode->encap >= XFRM_MODE_MAX))
340                 return -EINVAL;
341 
342         afinfo = xfrm_state_get_afinfo(family);
343         if (unlikely(afinfo == NULL))
344                 return -EAFNOSUPPORT;
345 
346         err = -EEXIST;
347         modemap = afinfo->mode_map;
348         spin_lock_bh(&xfrm_mode_lock);
349         if (modemap[mode->encap])
350                 goto out;
351 
352         err = -ENOENT;
353         if (!try_module_get(afinfo->owner))
354                 goto out;
355 
356         mode->afinfo = afinfo;
357         modemap[mode->encap] = mode;
358         err = 0;
359 
360 out:
361         spin_unlock_bh(&xfrm_mode_lock);
362         rcu_read_unlock();
363         return err;
364 }
365 EXPORT_SYMBOL(xfrm_register_mode);
366 
367 int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
368 {
369         struct xfrm_state_afinfo *afinfo;
370         struct xfrm_mode **modemap;
371         int err;
372 
373         if (unlikely(mode->encap >= XFRM_MODE_MAX))
374                 return -EINVAL;
375 
376         afinfo = xfrm_state_get_afinfo(family);
377         if (unlikely(afinfo == NULL))
378                 return -EAFNOSUPPORT;
379 
380         err = -ENOENT;
381         modemap = afinfo->mode_map;
382         spin_lock_bh(&xfrm_mode_lock);
383         if (likely(modemap[mode->encap] == mode)) {
384                 modemap[mode->encap] = NULL;
385                 module_put(mode->afinfo->owner);
386                 err = 0;
387         }
388 
389         spin_unlock_bh(&xfrm_mode_lock);
390         rcu_read_unlock();
391         return err;
392 }
393 EXPORT_SYMBOL(xfrm_unregister_mode);
394 
395 static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
396 {
397         struct xfrm_state_afinfo *afinfo;
398         struct xfrm_mode *mode;
399         int modload_attempted = 0;
400 
401         if (unlikely(encap >= XFRM_MODE_MAX))
402                 return NULL;
403 
404 retry:
405         afinfo = xfrm_state_get_afinfo(family);
406         if (unlikely(afinfo == NULL))
407                 return NULL;
408 
409         mode = READ_ONCE(afinfo->mode_map[encap]);
410         if (unlikely(mode && !try_module_get(mode->owner)))
411                 mode = NULL;
412 
413         rcu_read_unlock();
414         if (!mode && !modload_attempted) {
415                 request_module("xfrm-mode-%d-%d", family, encap);
416                 modload_attempted = 1;
417                 goto retry;
418         }
419 
420         return mode;
421 }
422 
423 static void xfrm_put_mode(struct xfrm_mode *mode)
424 {
425         module_put(mode->owner);
426 }
427 
428 static void xfrm_state_gc_destroy(struct xfrm_state *x)
429 {
430         tasklet_hrtimer_cancel(&x->mtimer);
431         del_timer_sync(&x->rtimer);
432         kfree(x->aead);
433         kfree(x->aalg);
434         kfree(x->ealg);
435         kfree(x->calg);
436         kfree(x->encap);
437         kfree(x->coaddr);
438         kfree(x->replay_esn);
439         kfree(x->preplay_esn);
440         if (x->inner_mode)
441                 xfrm_put_mode(x->inner_mode);
442         if (x->inner_mode_iaf)
443                 xfrm_put_mode(x->inner_mode_iaf);
444         if (x->outer_mode)
445                 xfrm_put_mode(x->outer_mode);
446         if (x->type_offload)
447                 xfrm_put_type_offload(x->type_offload);
448         if (x->type) {
449                 x->type->destructor(x);
450                 xfrm_put_type(x->type);
451         }
452         xfrm_dev_state_free(x);
453         security_xfrm_state_free(x);
454         kfree(x);
455 }
456 
457 static void xfrm_state_gc_task(struct work_struct *work)
458 {
459         struct xfrm_state *x;
460         struct hlist_node *tmp;
461         struct hlist_head gc_list;
462 
463         spin_lock_bh(&xfrm_state_gc_lock);
464         hlist_move_list(&xfrm_state_gc_list, &gc_list);
465         spin_unlock_bh(&xfrm_state_gc_lock);
466 
467         synchronize_rcu();
468 
469         hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
470                 xfrm_state_gc_destroy(x);
471 }
472 
473 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
474 {
475         struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
476         struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
477         unsigned long now = get_seconds();
478         long next = LONG_MAX;
479         int warn = 0;
480         int err = 0;
481 
482         spin_lock(&x->lock);
483         if (x->km.state == XFRM_STATE_DEAD)
484                 goto out;
485         if (x->km.state == XFRM_STATE_EXPIRED)
486                 goto expired;
487         if (x->lft.hard_add_expires_seconds) {
488                 long tmo = x->lft.hard_add_expires_seconds +
489                         x->curlft.add_time - now;
490                 if (tmo <= 0) {
491                         if (x->xflags & XFRM_SOFT_EXPIRE) {
492                                 /* enter hard expire without soft expire first?!
493                                  * setting a new date could trigger this.
494                                  * workaround: fix x->curflt.add_time by below:
495                                  */
496                                 x->curlft.add_time = now - x->saved_tmo - 1;
497                                 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
498                         } else
499                                 goto expired;
500                 }
501                 if (tmo < next)
502                         next = tmo;
503         }
504         if (x->lft.hard_use_expires_seconds) {
505                 long tmo = x->lft.hard_use_expires_seconds +
506                         (x->curlft.use_time ? : now) - now;
507                 if (tmo <= 0)
508                         goto expired;
509                 if (tmo < next)
510                         next = tmo;
511         }
512         if (x->km.dying)
513                 goto resched;
514         if (x->lft.soft_add_expires_seconds) {
515                 long tmo = x->lft.soft_add_expires_seconds +
516                         x->curlft.add_time - now;
517                 if (tmo <= 0) {
518                         warn = 1;
519                         x->xflags &= ~XFRM_SOFT_EXPIRE;
520                 } else if (tmo < next) {
521                         next = tmo;
522                         x->xflags |= XFRM_SOFT_EXPIRE;
523                         x->saved_tmo = tmo;
524                 }
525         }
526         if (x->lft.soft_use_expires_seconds) {
527                 long tmo = x->lft.soft_use_expires_seconds +
528                         (x->curlft.use_time ? : now) - now;
529                 if (tmo <= 0)
530                         warn = 1;
531                 else if (tmo < next)
532                         next = tmo;
533         }
534 
535         x->km.dying = warn;
536         if (warn)
537                 km_state_expired(x, 0, 0);
538 resched:
539         if (next != LONG_MAX) {
540                 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
541         }
542 
543         goto out;
544 
545 expired:
546         if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
547                 x->km.state = XFRM_STATE_EXPIRED;
548 
549         err = __xfrm_state_delete(x);
550         if (!err)
551                 km_state_expired(x, 1, 0);
552 
553         xfrm_audit_state_delete(x, err ? 0 : 1, true);
554 
555 out:
556         spin_unlock(&x->lock);
557         return HRTIMER_NORESTART;
558 }
559 
560 static void xfrm_replay_timer_handler(struct timer_list *t);
561 
562 struct xfrm_state *xfrm_state_alloc(struct net *net)
563 {
564         struct xfrm_state *x;
565 
566         x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
567 
568         if (x) {
569                 write_pnet(&x->xs_net, net);
570                 refcount_set(&x->refcnt, 1);
571                 atomic_set(&x->tunnel_users, 0);
572                 INIT_LIST_HEAD(&x->km.all);
573                 INIT_HLIST_NODE(&x->bydst);
574                 INIT_HLIST_NODE(&x->bysrc);
575                 INIT_HLIST_NODE(&x->byspi);
576                 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler,
577                                         CLOCK_BOOTTIME, HRTIMER_MODE_ABS);
578                 timer_setup(&x->rtimer, xfrm_replay_timer_handler, 0);
579                 x->curlft.add_time = get_seconds();
580                 x->lft.soft_byte_limit = XFRM_INF;
581                 x->lft.soft_packet_limit = XFRM_INF;
582                 x->lft.hard_byte_limit = XFRM_INF;
583                 x->lft.hard_packet_limit = XFRM_INF;
584                 x->replay_maxage = 0;
585                 x->replay_maxdiff = 0;
586                 x->inner_mode = NULL;
587                 x->inner_mode_iaf = NULL;
588                 spin_lock_init(&x->lock);
589         }
590         return x;
591 }
592 EXPORT_SYMBOL(xfrm_state_alloc);
593 
594 void __xfrm_state_destroy(struct xfrm_state *x)
595 {
596         WARN_ON(x->km.state != XFRM_STATE_DEAD);
597 
598         spin_lock_bh(&xfrm_state_gc_lock);
599         hlist_add_head(&x->gclist, &xfrm_state_gc_list);
600         spin_unlock_bh(&xfrm_state_gc_lock);
601         schedule_work(&xfrm_state_gc_work);
602 }
603 EXPORT_SYMBOL(__xfrm_state_destroy);
604 
605 int __xfrm_state_delete(struct xfrm_state *x)
606 {
607         struct net *net = xs_net(x);
608         int err = -ESRCH;
609 
610         if (x->km.state != XFRM_STATE_DEAD) {
611                 x->km.state = XFRM_STATE_DEAD;
612                 spin_lock(&net->xfrm.xfrm_state_lock);
613                 list_del(&x->km.all);
614                 hlist_del_rcu(&x->bydst);
615                 hlist_del_rcu(&x->bysrc);
616                 if (x->id.spi)
617                         hlist_del_rcu(&x->byspi);
618                 net->xfrm.state_num--;
619                 spin_unlock(&net->xfrm.xfrm_state_lock);
620 
621                 xfrm_dev_state_delete(x);
622 
623                 /* All xfrm_state objects are created by xfrm_state_alloc.
624                  * The xfrm_state_alloc call gives a reference, and that
625                  * is what we are dropping here.
626                  */
627                 xfrm_state_put(x);
628                 err = 0;
629         }
630 
631         return err;
632 }
633 EXPORT_SYMBOL(__xfrm_state_delete);
634 
635 int xfrm_state_delete(struct xfrm_state *x)
636 {
637         int err;
638 
639         spin_lock_bh(&x->lock);
640         err = __xfrm_state_delete(x);
641         spin_unlock_bh(&x->lock);
642 
643         return err;
644 }
645 EXPORT_SYMBOL(xfrm_state_delete);
646 
647 #ifdef CONFIG_SECURITY_NETWORK_XFRM
648 static inline int
649 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
650 {
651         int i, err = 0;
652 
653         for (i = 0; i <= net->xfrm.state_hmask; i++) {
654                 struct xfrm_state *x;
655 
656                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
657                         if (xfrm_id_proto_match(x->id.proto, proto) &&
658                            (err = security_xfrm_state_delete(x)) != 0) {
659                                 xfrm_audit_state_delete(x, 0, task_valid);
660                                 return err;
661                         }
662                 }
663         }
664 
665         return err;
666 }
667 
668 static inline int
669 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
670 {
671         int i, err = 0;
672 
673         for (i = 0; i <= net->xfrm.state_hmask; i++) {
674                 struct xfrm_state *x;
675                 struct xfrm_state_offload *xso;
676 
677                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
678                         xso = &x->xso;
679 
680                         if (xso->dev == dev &&
681                            (err = security_xfrm_state_delete(x)) != 0) {
682                                 xfrm_audit_state_delete(x, 0, task_valid);
683                                 return err;
684                         }
685                 }
686         }
687 
688         return err;
689 }
690 #else
691 static inline int
692 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
693 {
694         return 0;
695 }
696 
697 static inline int
698 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
699 {
700         return 0;
701 }
702 #endif
703 
704 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid)
705 {
706         int i, err = 0, cnt = 0;
707 
708         spin_lock_bh(&net->xfrm.xfrm_state_lock);
709         err = xfrm_state_flush_secctx_check(net, proto, task_valid);
710         if (err)
711                 goto out;
712 
713         err = -ESRCH;
714         for (i = 0; i <= net->xfrm.state_hmask; i++) {
715                 struct xfrm_state *x;
716 restart:
717                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
718                         if (!xfrm_state_kern(x) &&
719                             xfrm_id_proto_match(x->id.proto, proto)) {
720                                 xfrm_state_hold(x);
721                                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
722 
723                                 err = xfrm_state_delete(x);
724                                 xfrm_audit_state_delete(x, err ? 0 : 1,
725                                                         task_valid);
726                                 xfrm_state_put(x);
727                                 if (!err)
728                                         cnt++;
729 
730                                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
731                                 goto restart;
732                         }
733                 }
734         }
735 out:
736         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
737         if (cnt) {
738                 err = 0;
739                 xfrm_policy_cache_flush();
740         }
741         return err;
742 }
743 EXPORT_SYMBOL(xfrm_state_flush);
744 
745 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid)
746 {
747         int i, err = 0, cnt = 0;
748 
749         spin_lock_bh(&net->xfrm.xfrm_state_lock);
750         err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid);
751         if (err)
752                 goto out;
753 
754         err = -ESRCH;
755         for (i = 0; i <= net->xfrm.state_hmask; i++) {
756                 struct xfrm_state *x;
757                 struct xfrm_state_offload *xso;
758 restart:
759                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
760                         xso = &x->xso;
761 
762                         if (!xfrm_state_kern(x) && xso->dev == dev) {
763                                 xfrm_state_hold(x);
764                                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
765 
766                                 err = xfrm_state_delete(x);
767                                 xfrm_audit_state_delete(x, err ? 0 : 1,
768                                                         task_valid);
769                                 xfrm_state_put(x);
770                                 if (!err)
771                                         cnt++;
772 
773                                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
774                                 goto restart;
775                         }
776                 }
777         }
778         if (cnt)
779                 err = 0;
780 
781 out:
782         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
783         return err;
784 }
785 EXPORT_SYMBOL(xfrm_dev_state_flush);
786 
787 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
788 {
789         spin_lock_bh(&net->xfrm.xfrm_state_lock);
790         si->sadcnt = net->xfrm.state_num;
791         si->sadhcnt = net->xfrm.state_hmask;
792         si->sadhmcnt = xfrm_state_hashmax;
793         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
794 }
795 EXPORT_SYMBOL(xfrm_sad_getinfo);
796 
797 static void
798 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
799                     const struct xfrm_tmpl *tmpl,
800                     const xfrm_address_t *daddr, const xfrm_address_t *saddr,
801                     unsigned short family)
802 {
803         struct xfrm_state_afinfo *afinfo = xfrm_state_afinfo_get_rcu(family);
804 
805         if (!afinfo)
806                 return;
807 
808         afinfo->init_tempsel(&x->sel, fl);
809 
810         if (family != tmpl->encap_family) {
811                 afinfo = xfrm_state_afinfo_get_rcu(tmpl->encap_family);
812                 if (!afinfo)
813                         return;
814         }
815         afinfo->init_temprop(x, tmpl, daddr, saddr);
816 }
817 
818 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
819                                               const xfrm_address_t *daddr,
820                                               __be32 spi, u8 proto,
821                                               unsigned short family)
822 {
823         unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
824         struct xfrm_state *x;
825 
826         hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) {
827                 if (x->props.family != family ||
828                     x->id.spi       != spi ||
829                     x->id.proto     != proto ||
830                     !xfrm_addr_equal(&x->id.daddr, daddr, family))
831                         continue;
832 
833                 if ((mark & x->mark.m) != x->mark.v)
834                         continue;
835                 if (!xfrm_state_hold_rcu(x))
836                         continue;
837                 return x;
838         }
839 
840         return NULL;
841 }
842 
843 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
844                                                      const xfrm_address_t *daddr,
845                                                      const xfrm_address_t *saddr,
846                                                      u8 proto, unsigned short family)
847 {
848         unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
849         struct xfrm_state *x;
850 
851         hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) {
852                 if (x->props.family != family ||
853                     x->id.proto     != proto ||
854                     !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
855                     !xfrm_addr_equal(&x->props.saddr, saddr, family))
856                         continue;
857 
858                 if ((mark & x->mark.m) != x->mark.v)
859                         continue;
860                 if (!xfrm_state_hold_rcu(x))
861                         continue;
862                 return x;
863         }
864 
865         return NULL;
866 }
867 
868 static inline struct xfrm_state *
869 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
870 {
871         struct net *net = xs_net(x);
872         u32 mark = x->mark.v & x->mark.m;
873 
874         if (use_spi)
875                 return __xfrm_state_lookup(net, mark, &x->id.daddr,
876                                            x->id.spi, x->id.proto, family);
877         else
878                 return __xfrm_state_lookup_byaddr(net, mark,
879                                                   &x->id.daddr,
880                                                   &x->props.saddr,
881                                                   x->id.proto, family);
882 }
883 
884 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
885 {
886         if (have_hash_collision &&
887             (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
888             net->xfrm.state_num > net->xfrm.state_hmask)
889                 schedule_work(&net->xfrm.state_hash_work);
890 }
891 
892 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
893                                const struct flowi *fl, unsigned short family,
894                                struct xfrm_state **best, int *acq_in_progress,
895                                int *error)
896 {
897         /* Resolution logic:
898          * 1. There is a valid state with matching selector. Done.
899          * 2. Valid state with inappropriate selector. Skip.
900          *
901          * Entering area of "sysdeps".
902          *
903          * 3. If state is not valid, selector is temporary, it selects
904          *    only session which triggered previous resolution. Key
905          *    manager will do something to install a state with proper
906          *    selector.
907          */
908         if (x->km.state == XFRM_STATE_VALID) {
909                 if ((x->sel.family &&
910                      !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
911                     !security_xfrm_state_pol_flow_match(x, pol, fl))
912                         return;
913 
914                 if (!*best ||
915                     (*best)->km.dying > x->km.dying ||
916                     ((*best)->km.dying == x->km.dying &&
917                      (*best)->curlft.add_time < x->curlft.add_time))
918                         *best = x;
919         } else if (x->km.state == XFRM_STATE_ACQ) {
920                 *acq_in_progress = 1;
921         } else if (x->km.state == XFRM_STATE_ERROR ||
922                    x->km.state == XFRM_STATE_EXPIRED) {
923                 if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
924                     security_xfrm_state_pol_flow_match(x, pol, fl))
925                         *error = -ESRCH;
926         }
927 }
928 
929 struct xfrm_state *
930 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
931                 const struct flowi *fl, struct xfrm_tmpl *tmpl,
932                 struct xfrm_policy *pol, int *err,
933                 unsigned short family)
934 {
935         static xfrm_address_t saddr_wildcard = { };
936         struct net *net = xp_net(pol);
937         unsigned int h, h_wildcard;
938         struct xfrm_state *x, *x0, *to_put;
939         int acquire_in_progress = 0;
940         int error = 0;
941         struct xfrm_state *best = NULL;
942         u32 mark = pol->mark.v & pol->mark.m;
943         unsigned short encap_family = tmpl->encap_family;
944         unsigned int sequence;
945         struct km_event c;
946 
947         to_put = NULL;
948 
949         sequence = read_seqcount_begin(&xfrm_state_hash_generation);
950 
951         rcu_read_lock();
952         h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
953         hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) {
954                 if (x->props.family == encap_family &&
955                     x->props.reqid == tmpl->reqid &&
956                     (mark & x->mark.m) == x->mark.v &&
957                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
958                     xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
959                     tmpl->mode == x->props.mode &&
960                     tmpl->id.proto == x->id.proto &&
961                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
962                         xfrm_state_look_at(pol, x, fl, encap_family,
963                                            &best, &acquire_in_progress, &error);
964         }
965         if (best || acquire_in_progress)
966                 goto found;
967 
968         h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
969         hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h_wildcard, bydst) {
970                 if (x->props.family == encap_family &&
971                     x->props.reqid == tmpl->reqid &&
972                     (mark & x->mark.m) == x->mark.v &&
973                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
974                     xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
975                     tmpl->mode == x->props.mode &&
976                     tmpl->id.proto == x->id.proto &&
977                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
978                         xfrm_state_look_at(pol, x, fl, encap_family,
979                                            &best, &acquire_in_progress, &error);
980         }
981 
982 found:
983         x = best;
984         if (!x && !error && !acquire_in_progress) {
985                 if (tmpl->id.spi &&
986                     (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
987                                               tmpl->id.proto, encap_family)) != NULL) {
988                         to_put = x0;
989                         error = -EEXIST;
990                         goto out;
991                 }
992 
993                 c.net = net;
994                 /* If the KMs have no listeners (yet...), avoid allocating an SA
995                  * for each and every packet - garbage collection might not
996                  * handle the flood.
997                  */
998                 if (!km_is_alive(&c)) {
999                         error = -ESRCH;
1000                         goto out;
1001                 }
1002 
1003                 x = xfrm_state_alloc(net);
1004                 if (x == NULL) {
1005                         error = -ENOMEM;
1006                         goto out;
1007                 }
1008                 /* Initialize temporary state matching only
1009                  * to current session. */
1010                 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
1011                 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
1012 
1013                 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
1014                 if (error) {
1015                         x->km.state = XFRM_STATE_DEAD;
1016                         to_put = x;
1017                         x = NULL;
1018                         goto out;
1019                 }
1020 
1021                 if (km_query(x, tmpl, pol) == 0) {
1022                         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1023                         x->km.state = XFRM_STATE_ACQ;
1024                         list_add(&x->km.all, &net->xfrm.state_all);
1025                         hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1026                         h = xfrm_src_hash(net, daddr, saddr, encap_family);
1027                         hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1028                         if (x->id.spi) {
1029                                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
1030                                 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1031                         }
1032                         x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1033                         tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1034                         net->xfrm.state_num++;
1035                         xfrm_hash_grow_check(net, x->bydst.next != NULL);
1036                         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1037                 } else {
1038                         x->km.state = XFRM_STATE_DEAD;
1039                         to_put = x;
1040                         x = NULL;
1041                         error = -ESRCH;
1042                 }
1043         }
1044 out:
1045         if (x) {
1046                 if (!xfrm_state_hold_rcu(x)) {
1047                         *err = -EAGAIN;
1048                         x = NULL;
1049                 }
1050         } else {
1051                 *err = acquire_in_progress ? -EAGAIN : error;
1052         }
1053         rcu_read_unlock();
1054         if (to_put)
1055                 xfrm_state_put(to_put);
1056 
1057         if (read_seqcount_retry(&xfrm_state_hash_generation, sequence)) {
1058                 *err = -EAGAIN;
1059                 if (x) {
1060                         xfrm_state_put(x);
1061                         x = NULL;
1062                 }
1063         }
1064 
1065         return x;
1066 }
1067 
1068 struct xfrm_state *
1069 xfrm_stateonly_find(struct net *net, u32 mark,
1070                     xfrm_address_t *daddr, xfrm_address_t *saddr,
1071                     unsigned short family, u8 mode, u8 proto, u32 reqid)
1072 {
1073         unsigned int h;
1074         struct xfrm_state *rx = NULL, *x = NULL;
1075 
1076         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1077         h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1078         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1079                 if (x->props.family == family &&
1080                     x->props.reqid == reqid &&
1081                     (mark & x->mark.m) == x->mark.v &&
1082                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
1083                     xfrm_state_addr_check(x, daddr, saddr, family) &&
1084                     mode == x->props.mode &&
1085                     proto == x->id.proto &&
1086                     x->km.state == XFRM_STATE_VALID) {
1087                         rx = x;
1088                         break;
1089                 }
1090         }
1091 
1092         if (rx)
1093                 xfrm_state_hold(rx);
1094         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1095 
1096 
1097         return rx;
1098 }
1099 EXPORT_SYMBOL(xfrm_stateonly_find);
1100 
1101 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1102                                               unsigned short family)
1103 {
1104         struct xfrm_state *x;
1105         struct xfrm_state_walk *w;
1106 
1107         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1108         list_for_each_entry(w, &net->xfrm.state_all, all) {
1109                 x = container_of(w, struct xfrm_state, km);
1110                 if (x->props.family != family ||
1111                         x->id.spi != spi)
1112                         continue;
1113 
1114                 xfrm_state_hold(x);
1115                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1116                 return x;
1117         }
1118         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1119         return NULL;
1120 }
1121 EXPORT_SYMBOL(xfrm_state_lookup_byspi);
1122 
1123 static void __xfrm_state_insert(struct xfrm_state *x)
1124 {
1125         struct net *net = xs_net(x);
1126         unsigned int h;
1127 
1128         list_add(&x->km.all, &net->xfrm.state_all);
1129 
1130         h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
1131                           x->props.reqid, x->props.family);
1132         hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1133 
1134         h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
1135         hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1136 
1137         if (x->id.spi) {
1138                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
1139                                   x->props.family);
1140 
1141                 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1142         }
1143 
1144         tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1145         if (x->replay_maxage)
1146                 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
1147 
1148         net->xfrm.state_num++;
1149 
1150         xfrm_hash_grow_check(net, x->bydst.next != NULL);
1151 }
1152 
1153 /* net->xfrm.xfrm_state_lock is held */
1154 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
1155 {
1156         struct net *net = xs_net(xnew);
1157         unsigned short family = xnew->props.family;
1158         u32 reqid = xnew->props.reqid;
1159         struct xfrm_state *x;
1160         unsigned int h;
1161         u32 mark = xnew->mark.v & xnew->mark.m;
1162 
1163         h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
1164         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1165                 if (x->props.family     == family &&
1166                     x->props.reqid      == reqid &&
1167                     (mark & x->mark.m) == x->mark.v &&
1168                     xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
1169                     xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
1170                         x->genid++;
1171         }
1172 }
1173 
1174 void xfrm_state_insert(struct xfrm_state *x)
1175 {
1176         struct net *net = xs_net(x);
1177 
1178         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1179         __xfrm_state_bump_genids(x);
1180         __xfrm_state_insert(x);
1181         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1182 }
1183 EXPORT_SYMBOL(xfrm_state_insert);
1184 
1185 /* net->xfrm.xfrm_state_lock is held */
1186 static struct xfrm_state *__find_acq_core(struct net *net,
1187                                           const struct xfrm_mark *m,
1188                                           unsigned short family, u8 mode,
1189                                           u32 reqid, u8 proto,
1190                                           const xfrm_address_t *daddr,
1191                                           const xfrm_address_t *saddr,
1192                                           int create)
1193 {
1194         unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1195         struct xfrm_state *x;
1196         u32 mark = m->v & m->m;
1197 
1198         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1199                 if (x->props.reqid  != reqid ||
1200                     x->props.mode   != mode ||
1201                     x->props.family != family ||
1202                     x->km.state     != XFRM_STATE_ACQ ||
1203                     x->id.spi       != 0 ||
1204                     x->id.proto     != proto ||
1205                     (mark & x->mark.m) != x->mark.v ||
1206                     !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1207                     !xfrm_addr_equal(&x->props.saddr, saddr, family))
1208                         continue;
1209 
1210                 xfrm_state_hold(x);
1211                 return x;
1212         }
1213 
1214         if (!create)
1215                 return NULL;
1216 
1217         x = xfrm_state_alloc(net);
1218         if (likely(x)) {
1219                 switch (family) {
1220                 case AF_INET:
1221                         x->sel.daddr.a4 = daddr->a4;
1222                         x->sel.saddr.a4 = saddr->a4;
1223                         x->sel.prefixlen_d = 32;
1224                         x->sel.prefixlen_s = 32;
1225                         x->props.saddr.a4 = saddr->a4;
1226                         x->id.daddr.a4 = daddr->a4;
1227                         break;
1228 
1229                 case AF_INET6:
1230                         x->sel.daddr.in6 = daddr->in6;
1231                         x->sel.saddr.in6 = saddr->in6;
1232                         x->sel.prefixlen_d = 128;
1233                         x->sel.prefixlen_s = 128;
1234                         x->props.saddr.in6 = saddr->in6;
1235                         x->id.daddr.in6 = daddr->in6;
1236                         break;
1237                 }
1238 
1239                 x->km.state = XFRM_STATE_ACQ;
1240                 x->id.proto = proto;
1241                 x->props.family = family;
1242                 x->props.mode = mode;
1243                 x->props.reqid = reqid;
1244                 x->mark.v = m->v;
1245                 x->mark.m = m->m;
1246                 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1247                 xfrm_state_hold(x);
1248                 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1249                 list_add(&x->km.all, &net->xfrm.state_all);
1250                 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1251                 h = xfrm_src_hash(net, daddr, saddr, family);
1252                 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1253 
1254                 net->xfrm.state_num++;
1255 
1256                 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1257         }
1258 
1259         return x;
1260 }
1261 
1262 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1263 
1264 int xfrm_state_add(struct xfrm_state *x)
1265 {
1266         struct net *net = xs_net(x);
1267         struct xfrm_state *x1, *to_put;
1268         int family;
1269         int err;
1270         u32 mark = x->mark.v & x->mark.m;
1271         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1272 
1273         family = x->props.family;
1274 
1275         to_put = NULL;
1276 
1277         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1278 
1279         x1 = __xfrm_state_locate(x, use_spi, family);
1280         if (x1) {
1281                 to_put = x1;
1282                 x1 = NULL;
1283                 err = -EEXIST;
1284                 goto out;
1285         }
1286 
1287         if (use_spi && x->km.seq) {
1288                 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1289                 if (x1 && ((x1->id.proto != x->id.proto) ||
1290                     !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1291                         to_put = x1;
1292                         x1 = NULL;
1293                 }
1294         }
1295 
1296         if (use_spi && !x1)
1297                 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1298                                      x->props.reqid, x->id.proto,
1299                                      &x->id.daddr, &x->props.saddr, 0);
1300 
1301         __xfrm_state_bump_genids(x);
1302         __xfrm_state_insert(x);
1303         err = 0;
1304 
1305 out:
1306         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1307 
1308         if (x1) {
1309                 xfrm_state_delete(x1);
1310                 xfrm_state_put(x1);
1311         }
1312 
1313         if (to_put)
1314                 xfrm_state_put(to_put);
1315 
1316         return err;
1317 }
1318 EXPORT_SYMBOL(xfrm_state_add);
1319 
1320 #ifdef CONFIG_XFRM_MIGRATE
1321 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
1322                                            struct xfrm_encap_tmpl *encap)
1323 {
1324         struct net *net = xs_net(orig);
1325         struct xfrm_state *x = xfrm_state_alloc(net);
1326         if (!x)
1327                 goto out;
1328 
1329         memcpy(&x->id, &orig->id, sizeof(x->id));
1330         memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1331         memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1332         x->props.mode = orig->props.mode;
1333         x->props.replay_window = orig->props.replay_window;
1334         x->props.reqid = orig->props.reqid;
1335         x->props.family = orig->props.family;
1336         x->props.saddr = orig->props.saddr;
1337 
1338         if (orig->aalg) {
1339                 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1340                 if (!x->aalg)
1341                         goto error;
1342         }
1343         x->props.aalgo = orig->props.aalgo;
1344 
1345         if (orig->aead) {
1346                 x->aead = xfrm_algo_aead_clone(orig->aead);
1347                 x->geniv = orig->geniv;
1348                 if (!x->aead)
1349                         goto error;
1350         }
1351         if (orig->ealg) {
1352                 x->ealg = xfrm_algo_clone(orig->ealg);
1353                 if (!x->ealg)
1354                         goto error;
1355         }
1356         x->props.ealgo = orig->props.ealgo;
1357 
1358         if (orig->calg) {
1359                 x->calg = xfrm_algo_clone(orig->calg);
1360                 if (!x->calg)
1361                         goto error;
1362         }
1363         x->props.calgo = orig->props.calgo;
1364 
1365         if (encap || orig->encap) {
1366                 if (encap)
1367                         x->encap = kmemdup(encap, sizeof(*x->encap),
1368                                         GFP_KERNEL);
1369                 else
1370                         x->encap = kmemdup(orig->encap, sizeof(*x->encap),
1371                                         GFP_KERNEL);
1372 
1373                 if (!x->encap)
1374                         goto error;
1375         }
1376 
1377         if (orig->coaddr) {
1378                 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1379                                     GFP_KERNEL);
1380                 if (!x->coaddr)
1381                         goto error;
1382         }
1383 
1384         if (orig->replay_esn) {
1385                 if (xfrm_replay_clone(x, orig))
1386                         goto error;
1387         }
1388 
1389         memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1390 
1391         if (xfrm_init_state(x) < 0)
1392                 goto error;
1393 
1394         x->props.flags = orig->props.flags;
1395         x->props.extra_flags = orig->props.extra_flags;
1396 
1397         x->tfcpad = orig->tfcpad;
1398         x->replay_maxdiff = orig->replay_maxdiff;
1399         x->replay_maxage = orig->replay_maxage;
1400         x->curlft.add_time = orig->curlft.add_time;
1401         x->km.state = orig->km.state;
1402         x->km.seq = orig->km.seq;
1403         x->replay = orig->replay;
1404         x->preplay = orig->preplay;
1405 
1406         return x;
1407 
1408  error:
1409         xfrm_state_put(x);
1410 out:
1411         return NULL;
1412 }
1413 
1414 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net)
1415 {
1416         unsigned int h;
1417         struct xfrm_state *x = NULL;
1418 
1419         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1420 
1421         if (m->reqid) {
1422                 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
1423                                   m->reqid, m->old_family);
1424                 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1425                         if (x->props.mode != m->mode ||
1426                             x->id.proto != m->proto)
1427                                 continue;
1428                         if (m->reqid && x->props.reqid != m->reqid)
1429                                 continue;
1430                         if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1431                                              m->old_family) ||
1432                             !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1433                                              m->old_family))
1434                                 continue;
1435                         xfrm_state_hold(x);
1436                         break;
1437                 }
1438         } else {
1439                 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1440                                   m->old_family);
1441                 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1442                         if (x->props.mode != m->mode ||
1443                             x->id.proto != m->proto)
1444                                 continue;
1445                         if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1446                                              m->old_family) ||
1447                             !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1448                                              m->old_family))
1449                                 continue;
1450                         xfrm_state_hold(x);
1451                         break;
1452                 }
1453         }
1454 
1455         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1456 
1457         return x;
1458 }
1459 EXPORT_SYMBOL(xfrm_migrate_state_find);
1460 
1461 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1462                                       struct xfrm_migrate *m,
1463                                       struct xfrm_encap_tmpl *encap)
1464 {
1465         struct xfrm_state *xc;
1466 
1467         xc = xfrm_state_clone(x, encap);
1468         if (!xc)
1469                 return NULL;
1470 
1471         memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1472         memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1473 
1474         /* add state */
1475         if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1476                 /* a care is needed when the destination address of the
1477                    state is to be updated as it is a part of triplet */
1478                 xfrm_state_insert(xc);
1479         } else {
1480                 if (xfrm_state_add(xc) < 0)
1481                         goto error;
1482         }
1483 
1484         return xc;
1485 error:
1486         xfrm_state_put(xc);
1487         return NULL;
1488 }
1489 EXPORT_SYMBOL(xfrm_state_migrate);
1490 #endif
1491 
1492 int xfrm_state_update(struct xfrm_state *x)
1493 {
1494         struct xfrm_state *x1, *to_put;
1495         int err;
1496         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1497         struct net *net = xs_net(x);
1498 
1499         to_put = NULL;
1500 
1501         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1502         x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1503 
1504         err = -ESRCH;
1505         if (!x1)
1506                 goto out;
1507 
1508         if (xfrm_state_kern(x1)) {
1509                 to_put = x1;
1510                 err = -EEXIST;
1511                 goto out;
1512         }
1513 
1514         if (x1->km.state == XFRM_STATE_ACQ) {
1515                 __xfrm_state_insert(x);
1516                 x = NULL;
1517         }
1518         err = 0;
1519 
1520 out:
1521         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1522 
1523         if (to_put)
1524                 xfrm_state_put(to_put);
1525 
1526         if (err)
1527                 return err;
1528 
1529         if (!x) {
1530                 xfrm_state_delete(x1);
1531                 xfrm_state_put(x1);
1532                 return 0;
1533         }
1534 
1535         err = -EINVAL;
1536         spin_lock_bh(&x1->lock);
1537         if (likely(x1->km.state == XFRM_STATE_VALID)) {
1538                 if (x->encap && x1->encap &&
1539                     x->encap->encap_type == x1->encap->encap_type)
1540                         memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1541                 else if (x->encap || x1->encap)
1542                         goto fail;
1543 
1544                 if (x->coaddr && x1->coaddr) {
1545                         memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1546                 }
1547                 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1548                         memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1549                 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1550                 x1->km.dying = 0;
1551 
1552                 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1553                 if (x1->curlft.use_time)
1554                         xfrm_state_check_expire(x1);
1555 
1556                 err = 0;
1557                 x->km.state = XFRM_STATE_DEAD;
1558                 __xfrm_state_put(x);
1559         }
1560 
1561 fail:
1562         spin_unlock_bh(&x1->lock);
1563 
1564         xfrm_state_put(x1);
1565 
1566         return err;
1567 }
1568 EXPORT_SYMBOL(xfrm_state_update);
1569 
1570 int xfrm_state_check_expire(struct xfrm_state *x)
1571 {
1572         if (!x->curlft.use_time)
1573                 x->curlft.use_time = get_seconds();
1574 
1575         if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1576             x->curlft.packets >= x->lft.hard_packet_limit) {
1577                 x->km.state = XFRM_STATE_EXPIRED;
1578                 tasklet_hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL);
1579                 return -EINVAL;
1580         }
1581 
1582         if (!x->km.dying &&
1583             (x->curlft.bytes >= x->lft.soft_byte_limit ||
1584              x->curlft.packets >= x->lft.soft_packet_limit)) {
1585                 x->km.dying = 1;
1586                 km_state_expired(x, 0, 0);
1587         }
1588         return 0;
1589 }
1590 EXPORT_SYMBOL(xfrm_state_check_expire);
1591 
1592 struct xfrm_state *
1593 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1594                   u8 proto, unsigned short family)
1595 {
1596         struct xfrm_state *x;
1597 
1598         rcu_read_lock();
1599         x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1600         rcu_read_unlock();
1601         return x;
1602 }
1603 EXPORT_SYMBOL(xfrm_state_lookup);
1604 
1605 struct xfrm_state *
1606 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1607                          const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1608                          u8 proto, unsigned short family)
1609 {
1610         struct xfrm_state *x;
1611 
1612         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1613         x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1614         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1615         return x;
1616 }
1617 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1618 
1619 struct xfrm_state *
1620 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1621               u8 proto, const xfrm_address_t *daddr,
1622               const xfrm_address_t *saddr, int create, unsigned short family)
1623 {
1624         struct xfrm_state *x;
1625 
1626         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1627         x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create);
1628         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1629 
1630         return x;
1631 }
1632 EXPORT_SYMBOL(xfrm_find_acq);
1633 
1634 #ifdef CONFIG_XFRM_SUB_POLICY
1635 int
1636 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1637                unsigned short family, struct net *net)
1638 {
1639         int i;
1640         int err = 0;
1641         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1642         if (!afinfo)
1643                 return -EAFNOSUPPORT;
1644 
1645         spin_lock_bh(&net->xfrm.xfrm_state_lock); /*FIXME*/
1646         if (afinfo->tmpl_sort)
1647                 err = afinfo->tmpl_sort(dst, src, n);
1648         else
1649                 for (i = 0; i < n; i++)
1650                         dst[i] = src[i];
1651         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1652         rcu_read_unlock();
1653         return err;
1654 }
1655 EXPORT_SYMBOL(xfrm_tmpl_sort);
1656 
1657 int
1658 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1659                 unsigned short family)
1660 {
1661         int i;
1662         int err = 0;
1663         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1664         struct net *net = xs_net(*src);
1665 
1666         if (!afinfo)
1667                 return -EAFNOSUPPORT;
1668 
1669         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1670         if (afinfo->state_sort)
1671                 err = afinfo->state_sort(dst, src, n);
1672         else
1673                 for (i = 0; i < n; i++)
1674                         dst[i] = src[i];
1675         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1676         rcu_read_unlock();
1677         return err;
1678 }
1679 EXPORT_SYMBOL(xfrm_state_sort);
1680 #endif
1681 
1682 /* Silly enough, but I'm lazy to build resolution list */
1683 
1684 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1685 {
1686         int i;
1687 
1688         for (i = 0; i <= net->xfrm.state_hmask; i++) {
1689                 struct xfrm_state *x;
1690 
1691                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
1692                         if (x->km.seq == seq &&
1693                             (mark & x->mark.m) == x->mark.v &&
1694                             x->km.state == XFRM_STATE_ACQ) {
1695                                 xfrm_state_hold(x);
1696                                 return x;
1697                         }
1698                 }
1699         }
1700         return NULL;
1701 }
1702 
1703 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1704 {
1705         struct xfrm_state *x;
1706 
1707         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1708         x = __xfrm_find_acq_byseq(net, mark, seq);
1709         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1710         return x;
1711 }
1712 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1713 
1714 u32 xfrm_get_acqseq(void)
1715 {
1716         u32 res;
1717         static atomic_t acqseq;
1718 
1719         do {
1720                 res = atomic_inc_return(&acqseq);
1721         } while (!res);
1722 
1723         return res;
1724 }
1725 EXPORT_SYMBOL(xfrm_get_acqseq);
1726 
1727 int verify_spi_info(u8 proto, u32 min, u32 max)
1728 {
1729         switch (proto) {
1730         case IPPROTO_AH:
1731         case IPPROTO_ESP:
1732                 break;
1733 
1734         case IPPROTO_COMP:
1735                 /* IPCOMP spi is 16-bits. */
1736                 if (max >= 0x10000)
1737                         return -EINVAL;
1738                 break;
1739 
1740         default:
1741                 return -EINVAL;
1742         }
1743 
1744         if (min > max)
1745                 return -EINVAL;
1746 
1747         return 0;
1748 }
1749 EXPORT_SYMBOL(verify_spi_info);
1750 
1751 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1752 {
1753         struct net *net = xs_net(x);
1754         unsigned int h;
1755         struct xfrm_state *x0;
1756         int err = -ENOENT;
1757         __be32 minspi = htonl(low);
1758         __be32 maxspi = htonl(high);
1759         u32 mark = x->mark.v & x->mark.m;
1760 
1761         spin_lock_bh(&x->lock);
1762         if (x->km.state == XFRM_STATE_DEAD)
1763                 goto unlock;
1764 
1765         err = 0;
1766         if (x->id.spi)
1767                 goto unlock;
1768 
1769         err = -ENOENT;
1770 
1771         if (minspi == maxspi) {
1772                 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1773                 if (x0) {
1774                         xfrm_state_put(x0);
1775                         goto unlock;
1776                 }
1777                 x->id.spi = minspi;
1778         } else {
1779                 u32 spi = 0;
1780                 for (h = 0; h < high-low+1; h++) {
1781                         spi = low + prandom_u32()%(high-low+1);
1782                         x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1783                         if (x0 == NULL) {
1784                                 x->id.spi = htonl(spi);
1785                                 break;
1786                         }
1787                         xfrm_state_put(x0);
1788                 }
1789         }
1790         if (x->id.spi) {
1791                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1792                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1793                 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1794                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1795 
1796                 err = 0;
1797         }
1798 
1799 unlock:
1800         spin_unlock_bh(&x->lock);
1801 
1802         return err;
1803 }
1804 EXPORT_SYMBOL(xfrm_alloc_spi);
1805 
1806 static bool __xfrm_state_filter_match(struct xfrm_state *x,
1807                                       struct xfrm_address_filter *filter)
1808 {
1809         if (filter) {
1810                 if ((filter->family == AF_INET ||
1811                      filter->family == AF_INET6) &&
1812                     x->props.family != filter->family)
1813                         return false;
1814 
1815                 return addr_match(&x->props.saddr, &filter->saddr,
1816                                   filter->splen) &&
1817                        addr_match(&x->id.daddr, &filter->daddr,
1818                                   filter->dplen);
1819         }
1820         return true;
1821 }
1822 
1823 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1824                     int (*func)(struct xfrm_state *, int, void*),
1825                     void *data)
1826 {
1827         struct xfrm_state *state;
1828         struct xfrm_state_walk *x;
1829         int err = 0;
1830 
1831         if (walk->seq != 0 && list_empty(&walk->all))
1832                 return 0;
1833 
1834         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1835         if (list_empty(&walk->all))
1836                 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1837         else
1838                 x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
1839         list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1840                 if (x->state == XFRM_STATE_DEAD)
1841                         continue;
1842                 state = container_of(x, struct xfrm_state, km);
1843                 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1844                         continue;
1845                 if (!__xfrm_state_filter_match(state, walk->filter))
1846                         continue;
1847                 err = func(state, walk->seq, data);
1848                 if (err) {
1849                         list_move_tail(&walk->all, &x->all);
1850                         goto out;
1851                 }
1852                 walk->seq++;
1853         }
1854         if (walk->seq == 0) {
1855                 err = -ENOENT;
1856                 goto out;
1857         }
1858         list_del_init(&walk->all);
1859 out:
1860         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1861         return err;
1862 }
1863 EXPORT_SYMBOL(xfrm_state_walk);
1864 
1865 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1866                           struct xfrm_address_filter *filter)
1867 {
1868         INIT_LIST_HEAD(&walk->all);
1869         walk->proto = proto;
1870         walk->state = XFRM_STATE_DEAD;
1871         walk->seq = 0;
1872         walk->filter = filter;
1873 }
1874 EXPORT_SYMBOL(xfrm_state_walk_init);
1875 
1876 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
1877 {
1878         kfree(walk->filter);
1879 
1880         if (list_empty(&walk->all))
1881                 return;
1882 
1883         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1884         list_del(&walk->all);
1885         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1886 }
1887 EXPORT_SYMBOL(xfrm_state_walk_done);
1888 
1889 static void xfrm_replay_timer_handler(struct timer_list *t)
1890 {
1891         struct xfrm_state *x = from_timer(x, t, rtimer);
1892 
1893         spin_lock(&x->lock);
1894 
1895         if (x->km.state == XFRM_STATE_VALID) {
1896                 if (xfrm_aevent_is_on(xs_net(x)))
1897                         x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
1898                 else
1899                         x->xflags |= XFRM_TIME_DEFER;
1900         }
1901 
1902         spin_unlock(&x->lock);
1903 }
1904 
1905 static LIST_HEAD(xfrm_km_list);
1906 
1907 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1908 {
1909         struct xfrm_mgr *km;
1910 
1911         rcu_read_lock();
1912         list_for_each_entry_rcu(km, &xfrm_km_list, list)
1913                 if (km->notify_policy)
1914                         km->notify_policy(xp, dir, c);
1915         rcu_read_unlock();
1916 }
1917 
1918 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
1919 {
1920         struct xfrm_mgr *km;
1921         rcu_read_lock();
1922         list_for_each_entry_rcu(km, &xfrm_km_list, list)
1923                 if (km->notify)
1924                         km->notify(x, c);
1925         rcu_read_unlock();
1926 }
1927 
1928 EXPORT_SYMBOL(km_policy_notify);
1929 EXPORT_SYMBOL(km_state_notify);
1930 
1931 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
1932 {
1933         struct km_event c;
1934 
1935         c.data.hard = hard;
1936         c.portid = portid;
1937         c.event = XFRM_MSG_EXPIRE;
1938         km_state_notify(x, &c);
1939 }
1940 
1941 EXPORT_SYMBOL(km_state_expired);
1942 /*
1943  * We send to all registered managers regardless of failure
1944  * We are happy with one success
1945 */
1946 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1947 {
1948         int err = -EINVAL, acqret;
1949         struct xfrm_mgr *km;
1950 
1951         rcu_read_lock();
1952         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1953                 acqret = km->acquire(x, t, pol);
1954                 if (!acqret)
1955                         err = acqret;
1956         }
1957         rcu_read_unlock();
1958         return err;
1959 }
1960 EXPORT_SYMBOL(km_query);
1961 
1962 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1963 {
1964         int err = -EINVAL;
1965         struct xfrm_mgr *km;
1966 
1967         rcu_read_lock();
1968         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1969                 if (km->new_mapping)
1970                         err = km->new_mapping(x, ipaddr, sport);
1971                 if (!err)
1972                         break;
1973         }
1974         rcu_read_unlock();
1975         return err;
1976 }
1977 EXPORT_SYMBOL(km_new_mapping);
1978 
1979 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
1980 {
1981         struct km_event c;
1982 
1983         c.data.hard = hard;
1984         c.portid = portid;
1985         c.event = XFRM_MSG_POLEXPIRE;
1986         km_policy_notify(pol, dir, &c);
1987 }
1988 EXPORT_SYMBOL(km_policy_expired);
1989 
1990 #ifdef CONFIG_XFRM_MIGRATE
1991 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1992                const struct xfrm_migrate *m, int num_migrate,
1993                const struct xfrm_kmaddress *k,
1994                const struct xfrm_encap_tmpl *encap)
1995 {
1996         int err = -EINVAL;
1997         int ret;
1998         struct xfrm_mgr *km;
1999 
2000         rcu_read_lock();
2001         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2002                 if (km->migrate) {
2003                         ret = km->migrate(sel, dir, type, m, num_migrate, k,
2004                                           encap);
2005                         if (!ret)
2006                                 err = ret;
2007                 }
2008         }
2009         rcu_read_unlock();
2010         return err;
2011 }
2012 EXPORT_SYMBOL(km_migrate);
2013 #endif
2014 
2015 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
2016 {
2017         int err = -EINVAL;
2018         int ret;
2019         struct xfrm_mgr *km;
2020 
2021         rcu_read_lock();
2022         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2023                 if (km->report) {
2024                         ret = km->report(net, proto, sel, addr);
2025                         if (!ret)
2026                                 err = ret;
2027                 }
2028         }
2029         rcu_read_unlock();
2030         return err;
2031 }
2032 EXPORT_SYMBOL(km_report);
2033 
2034 bool km_is_alive(const struct km_event *c)
2035 {
2036         struct xfrm_mgr *km;
2037         bool is_alive = false;
2038 
2039         rcu_read_lock();
2040         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2041                 if (km->is_alive && km->is_alive(c)) {
2042                         is_alive = true;
2043                         break;
2044                 }
2045         }
2046         rcu_read_unlock();
2047 
2048         return is_alive;
2049 }
2050 EXPORT_SYMBOL(km_is_alive);
2051 
2052 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
2053 {
2054         int err;
2055         u8 *data;
2056         struct xfrm_mgr *km;
2057         struct xfrm_policy *pol = NULL;
2058 
2059 #ifdef CONFIG_COMPAT
2060         if (in_compat_syscall())
2061                 return -EOPNOTSUPP;
2062 #endif
2063 
2064         if (!optval && !optlen) {
2065                 xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
2066                 xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL);
2067                 __sk_dst_reset(sk);
2068                 return 0;
2069         }
2070 
2071         if (optlen <= 0 || optlen > PAGE_SIZE)
2072                 return -EMSGSIZE;
2073 
2074         data = memdup_user(optval, optlen);
2075         if (IS_ERR(data))
2076                 return PTR_ERR(data);
2077 
2078         err = -EINVAL;
2079         rcu_read_lock();
2080         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2081                 pol = km->compile_policy(sk, optname, data,
2082                                          optlen, &err);
2083                 if (err >= 0)
2084                         break;
2085         }
2086         rcu_read_unlock();
2087 
2088         if (err >= 0) {
2089                 xfrm_sk_policy_insert(sk, err, pol);
2090                 xfrm_pol_put(pol);
2091                 __sk_dst_reset(sk);
2092                 err = 0;
2093         }
2094 
2095         kfree(data);
2096         return err;
2097 }
2098 EXPORT_SYMBOL(xfrm_user_policy);
2099 
2100 static DEFINE_SPINLOCK(xfrm_km_lock);
2101 
2102 int xfrm_register_km(struct xfrm_mgr *km)
2103 {
2104         spin_lock_bh(&xfrm_km_lock);
2105         list_add_tail_rcu(&km->list, &xfrm_km_list);
2106         spin_unlock_bh(&xfrm_km_lock);
2107         return 0;
2108 }
2109 EXPORT_SYMBOL(xfrm_register_km);
2110 
2111 int xfrm_unregister_km(struct xfrm_mgr *km)
2112 {
2113         spin_lock_bh(&xfrm_km_lock);
2114         list_del_rcu(&km->list);
2115         spin_unlock_bh(&xfrm_km_lock);
2116         synchronize_rcu();
2117         return 0;
2118 }
2119 EXPORT_SYMBOL(xfrm_unregister_km);
2120 
2121 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
2122 {
2123         int err = 0;
2124 
2125         if (WARN_ON(afinfo->family >= NPROTO))
2126                 return -EAFNOSUPPORT;
2127 
2128         spin_lock_bh(&xfrm_state_afinfo_lock);
2129         if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
2130                 err = -EEXIST;
2131         else
2132                 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
2133         spin_unlock_bh(&xfrm_state_afinfo_lock);
2134         return err;
2135 }
2136 EXPORT_SYMBOL(xfrm_state_register_afinfo);
2137 
2138 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
2139 {
2140         int err = 0, family = afinfo->family;
2141 
2142         if (WARN_ON(family >= NPROTO))
2143                 return -EAFNOSUPPORT;
2144 
2145         spin_lock_bh(&xfrm_state_afinfo_lock);
2146         if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
2147                 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo)
2148                         err = -EINVAL;
2149                 else
2150                         RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
2151         }
2152         spin_unlock_bh(&xfrm_state_afinfo_lock);
2153         synchronize_rcu();
2154         return err;
2155 }
2156 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
2157 
2158 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family)
2159 {
2160         if (unlikely(family >= NPROTO))
2161                 return NULL;
2162 
2163         return rcu_dereference(xfrm_state_afinfo[family]);
2164 }
2165 
2166 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
2167 {
2168         struct xfrm_state_afinfo *afinfo;
2169         if (unlikely(family >= NPROTO))
2170                 return NULL;
2171         rcu_read_lock();
2172         afinfo = rcu_dereference(xfrm_state_afinfo[family]);
2173         if (unlikely(!afinfo))
2174                 rcu_read_unlock();
2175         return afinfo;
2176 }
2177 
2178 void xfrm_flush_gc(void)
2179 {
2180         flush_work(&xfrm_state_gc_work);
2181 }
2182 EXPORT_SYMBOL(xfrm_flush_gc);
2183 
2184 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
2185 void xfrm_state_delete_tunnel(struct xfrm_state *x)
2186 {
2187         if (x->tunnel) {
2188                 struct xfrm_state *t = x->tunnel;
2189 
2190                 if (atomic_read(&t->tunnel_users) == 2)
2191                         xfrm_state_delete(t);
2192                 atomic_dec(&t->tunnel_users);
2193                 xfrm_state_put(t);
2194                 x->tunnel = NULL;
2195         }
2196 }
2197 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
2198 
2199 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
2200 {
2201         const struct xfrm_type *type = READ_ONCE(x->type);
2202 
2203         if (x->km.state == XFRM_STATE_VALID &&
2204             type && type->get_mtu)
2205                 return type->get_mtu(x, mtu);
2206 
2207         return mtu - x->props.header_len;
2208 }
2209 
2210 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload)
2211 {
2212         struct xfrm_state_afinfo *afinfo;
2213         struct xfrm_mode *inner_mode;
2214         int family = x->props.family;
2215         int err;
2216 
2217         err = -EAFNOSUPPORT;
2218         afinfo = xfrm_state_get_afinfo(family);
2219         if (!afinfo)
2220                 goto error;
2221 
2222         err = 0;
2223         if (afinfo->init_flags)
2224                 err = afinfo->init_flags(x);
2225 
2226         rcu_read_unlock();
2227 
2228         if (err)
2229                 goto error;
2230 
2231         err = -EPROTONOSUPPORT;
2232 
2233         if (x->sel.family != AF_UNSPEC) {
2234                 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2235                 if (inner_mode == NULL)
2236                         goto error;
2237 
2238                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2239                     family != x->sel.family) {
2240                         xfrm_put_mode(inner_mode);
2241                         goto error;
2242                 }
2243 
2244                 x->inner_mode = inner_mode;
2245         } else {
2246                 struct xfrm_mode *inner_mode_iaf;
2247                 int iafamily = AF_INET;
2248 
2249                 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2250                 if (inner_mode == NULL)
2251                         goto error;
2252 
2253                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
2254                         xfrm_put_mode(inner_mode);
2255                         goto error;
2256                 }
2257                 x->inner_mode = inner_mode;
2258 
2259                 if (x->props.family == AF_INET)
2260                         iafamily = AF_INET6;
2261 
2262                 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2263                 if (inner_mode_iaf) {
2264                         if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2265                                 x->inner_mode_iaf = inner_mode_iaf;
2266                         else
2267                                 xfrm_put_mode(inner_mode_iaf);
2268                 }
2269         }
2270 
2271         x->type = xfrm_get_type(x->id.proto, family);
2272         if (x->type == NULL)
2273                 goto error;
2274 
2275         x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload);
2276 
2277         err = x->type->init_state(x);
2278         if (err)
2279                 goto error;
2280 
2281         x->outer_mode = xfrm_get_mode(x->props.mode, family);
2282         if (x->outer_mode == NULL) {
2283                 err = -EPROTONOSUPPORT;
2284                 goto error;
2285         }
2286 
2287         if (init_replay) {
2288                 err = xfrm_init_replay(x);
2289                 if (err)
2290                         goto error;
2291         }
2292 
2293 error:
2294         return err;
2295 }
2296 
2297 EXPORT_SYMBOL(__xfrm_init_state);
2298 
2299 int xfrm_init_state(struct xfrm_state *x)
2300 {
2301         int err;
2302 
2303         err = __xfrm_init_state(x, true, false);
2304         if (!err)
2305                 x->km.state = XFRM_STATE_VALID;
2306 
2307         return err;
2308 }
2309 
2310 EXPORT_SYMBOL(xfrm_init_state);
2311 
2312 int __net_init xfrm_state_init(struct net *net)
2313 {
2314         unsigned int sz;
2315 
2316         INIT_LIST_HEAD(&net->xfrm.state_all);
2317 
2318         sz = sizeof(struct hlist_head) * 8;
2319 
2320         net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2321         if (!net->xfrm.state_bydst)
2322                 goto out_bydst;
2323         net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2324         if (!net->xfrm.state_bysrc)
2325                 goto out_bysrc;
2326         net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2327         if (!net->xfrm.state_byspi)
2328                 goto out_byspi;
2329         net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2330 
2331         net->xfrm.state_num = 0;
2332         INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2333         spin_lock_init(&net->xfrm.xfrm_state_lock);
2334         return 0;
2335 
2336 out_byspi:
2337         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2338 out_bysrc:
2339         xfrm_hash_free(net->xfrm.state_bydst, sz);
2340 out_bydst:
2341         return -ENOMEM;
2342 }
2343 
2344 void xfrm_state_fini(struct net *net)
2345 {
2346         unsigned int sz;
2347 
2348         flush_work(&net->xfrm.state_hash_work);
2349         xfrm_state_flush(net, IPSEC_PROTO_ANY, false);
2350         flush_work(&xfrm_state_gc_work);
2351 
2352         WARN_ON(!list_empty(&net->xfrm.state_all));
2353 
2354         sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2355         WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2356         xfrm_hash_free(net->xfrm.state_byspi, sz);
2357         WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2358         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2359         WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2360         xfrm_hash_free(net->xfrm.state_bydst, sz);
2361 }
2362 
2363 #ifdef CONFIG_AUDITSYSCALL
2364 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2365                                      struct audit_buffer *audit_buf)
2366 {
2367         struct xfrm_sec_ctx *ctx = x->security;
2368         u32 spi = ntohl(x->id.spi);
2369 
2370         if (ctx)
2371                 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2372                                  ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2373 
2374         switch (x->props.family) {
2375         case AF_INET:
2376                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2377                                  &x->props.saddr.a4, &x->id.daddr.a4);
2378                 break;
2379         case AF_INET6:
2380                 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2381                                  x->props.saddr.a6, x->id.daddr.a6);
2382                 break;
2383         }
2384 
2385         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2386 }
2387 
2388 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2389                                       struct audit_buffer *audit_buf)
2390 {
2391         const struct iphdr *iph4;
2392         const struct ipv6hdr *iph6;
2393 
2394         switch (family) {
2395         case AF_INET:
2396                 iph4 = ip_hdr(skb);
2397                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2398                                  &iph4->saddr, &iph4->daddr);
2399                 break;
2400         case AF_INET6:
2401                 iph6 = ipv6_hdr(skb);
2402                 audit_log_format(audit_buf,
2403                                  " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2404                                  &iph6->saddr, &iph6->daddr,
2405                                  iph6->flow_lbl[0] & 0x0f,
2406                                  iph6->flow_lbl[1],
2407                                  iph6->flow_lbl[2]);
2408                 break;
2409         }
2410 }
2411 
2412 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
2413 {
2414         struct audit_buffer *audit_buf;
2415 
2416         audit_buf = xfrm_audit_start("SAD-add");
2417         if (audit_buf == NULL)
2418                 return;
2419         xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2420         xfrm_audit_helper_sainfo(x, audit_buf);
2421         audit_log_format(audit_buf, " res=%u", result);
2422         audit_log_end(audit_buf);
2423 }
2424 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2425 
2426 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
2427 {
2428         struct audit_buffer *audit_buf;
2429 
2430         audit_buf = xfrm_audit_start("SAD-delete");
2431         if (audit_buf == NULL)
2432                 return;
2433         xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2434         xfrm_audit_helper_sainfo(x, audit_buf);
2435         audit_log_format(audit_buf, " res=%u", result);
2436         audit_log_end(audit_buf);
2437 }
2438 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2439 
2440 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2441                                       struct sk_buff *skb)
2442 {
2443         struct audit_buffer *audit_buf;
2444         u32 spi;
2445 
2446         audit_buf = xfrm_audit_start("SA-replay-overflow");
2447         if (audit_buf == NULL)
2448                 return;
2449         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2450         /* don't record the sequence number because it's inherent in this kind
2451          * of audit message */
2452         spi = ntohl(x->id.spi);
2453         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2454         audit_log_end(audit_buf);
2455 }
2456 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2457 
2458 void xfrm_audit_state_replay(struct xfrm_state *x,
2459                              struct sk_buff *skb, __be32 net_seq)
2460 {
2461         struct audit_buffer *audit_buf;
2462         u32 spi;
2463 
2464         audit_buf = xfrm_audit_start("SA-replayed-pkt");
2465         if (audit_buf == NULL)
2466                 return;
2467         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2468         spi = ntohl(x->id.spi);
2469         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2470                          spi, spi, ntohl(net_seq));
2471         audit_log_end(audit_buf);
2472 }
2473 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2474 
2475 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2476 {
2477         struct audit_buffer *audit_buf;
2478 
2479         audit_buf = xfrm_audit_start("SA-notfound");
2480         if (audit_buf == NULL)
2481                 return;
2482         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2483         audit_log_end(audit_buf);
2484 }
2485 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2486 
2487 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2488                                __be32 net_spi, __be32 net_seq)
2489 {
2490         struct audit_buffer *audit_buf;
2491         u32 spi;
2492 
2493         audit_buf = xfrm_audit_start("SA-notfound");
2494         if (audit_buf == NULL)
2495                 return;
2496         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2497         spi = ntohl(net_spi);
2498         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2499                          spi, spi, ntohl(net_seq));
2500         audit_log_end(audit_buf);
2501 }
2502 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2503 
2504 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2505                               struct sk_buff *skb, u8 proto)
2506 {
2507         struct audit_buffer *audit_buf;
2508         __be32 net_spi;
2509         __be32 net_seq;
2510 
2511         audit_buf = xfrm_audit_start("SA-icv-failure");
2512         if (audit_buf == NULL)
2513                 return;
2514         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2515         if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2516                 u32 spi = ntohl(net_spi);
2517                 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2518                                  spi, spi, ntohl(net_seq));
2519         }
2520         audit_log_end(audit_buf);
2521 }
2522 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2523 #endif /* CONFIG_AUDITSYSCALL */
2524 

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