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

Version: ~ [ linux-5.11-rc3 ] ~ [ linux-5.10.7 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.89 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.167 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.215 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.251 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.251 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ 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-2.6.32.71 ] ~ [ 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 <asm/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 /* Each xfrm_state may be linked to two tables:
 32 
 33    1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
 34    2. Hash table by (daddr,family,reqid) to find what SAs exist for given
 35       destination/tunnel endpoint. (output)
 36  */
 37 
 38 static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
 39 
 40 static inline unsigned int xfrm_dst_hash(struct net *net,
 41                                          const xfrm_address_t *daddr,
 42                                          const xfrm_address_t *saddr,
 43                                          u32 reqid,
 44                                          unsigned short family)
 45 {
 46         return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
 47 }
 48 
 49 static inline unsigned int xfrm_src_hash(struct net *net,
 50                                          const xfrm_address_t *daddr,
 51                                          const xfrm_address_t *saddr,
 52                                          unsigned short family)
 53 {
 54         return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
 55 }
 56 
 57 static inline unsigned int
 58 xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr,
 59               __be32 spi, u8 proto, unsigned short family)
 60 {
 61         return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
 62 }
 63 
 64 static void xfrm_hash_transfer(struct hlist_head *list,
 65                                struct hlist_head *ndsttable,
 66                                struct hlist_head *nsrctable,
 67                                struct hlist_head *nspitable,
 68                                unsigned int nhashmask)
 69 {
 70         struct hlist_node *tmp;
 71         struct xfrm_state *x;
 72 
 73         hlist_for_each_entry_safe(x, tmp, list, bydst) {
 74                 unsigned int h;
 75 
 76                 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
 77                                     x->props.reqid, x->props.family,
 78                                     nhashmask);
 79                 hlist_add_head(&x->bydst, ndsttable+h);
 80 
 81                 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
 82                                     x->props.family,
 83                                     nhashmask);
 84                 hlist_add_head(&x->bysrc, nsrctable+h);
 85 
 86                 if (x->id.spi) {
 87                         h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
 88                                             x->id.proto, x->props.family,
 89                                             nhashmask);
 90                         hlist_add_head(&x->byspi, nspitable+h);
 91                 }
 92         }
 93 }
 94 
 95 static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
 96 {
 97         return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
 98 }
 99 
100 static void xfrm_hash_resize(struct work_struct *work)
101 {
102         struct net *net = container_of(work, struct net, xfrm.state_hash_work);
103         struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
104         unsigned long nsize, osize;
105         unsigned int nhashmask, ohashmask;
106         int i;
107 
108         nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
109         ndst = xfrm_hash_alloc(nsize);
110         if (!ndst)
111                 return;
112         nsrc = xfrm_hash_alloc(nsize);
113         if (!nsrc) {
114                 xfrm_hash_free(ndst, nsize);
115                 return;
116         }
117         nspi = xfrm_hash_alloc(nsize);
118         if (!nspi) {
119                 xfrm_hash_free(ndst, nsize);
120                 xfrm_hash_free(nsrc, nsize);
121                 return;
122         }
123 
124         spin_lock_bh(&net->xfrm.xfrm_state_lock);
125 
126         nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
127         for (i = net->xfrm.state_hmask; i >= 0; i--)
128                 xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi,
129                                    nhashmask);
130 
131         odst = net->xfrm.state_bydst;
132         osrc = net->xfrm.state_bysrc;
133         ospi = net->xfrm.state_byspi;
134         ohashmask = net->xfrm.state_hmask;
135 
136         net->xfrm.state_bydst = ndst;
137         net->xfrm.state_bysrc = nsrc;
138         net->xfrm.state_byspi = nspi;
139         net->xfrm.state_hmask = nhashmask;
140 
141         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
142 
143         osize = (ohashmask + 1) * sizeof(struct hlist_head);
144         xfrm_hash_free(odst, osize);
145         xfrm_hash_free(osrc, osize);
146         xfrm_hash_free(ospi, osize);
147 }
148 
149 static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
150 static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO];
151 
152 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
153 
154 int __xfrm_state_delete(struct xfrm_state *x);
155 
156 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
157 bool km_is_alive(const struct km_event *c);
158 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
159 
160 static DEFINE_SPINLOCK(xfrm_type_lock);
161 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
162 {
163         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
164         const struct xfrm_type **typemap;
165         int err = 0;
166 
167         if (unlikely(afinfo == NULL))
168                 return -EAFNOSUPPORT;
169         typemap = afinfo->type_map;
170         spin_lock_bh(&xfrm_type_lock);
171 
172         if (likely(typemap[type->proto] == NULL))
173                 typemap[type->proto] = type;
174         else
175                 err = -EEXIST;
176         spin_unlock_bh(&xfrm_type_lock);
177         xfrm_state_put_afinfo(afinfo);
178         return err;
179 }
180 EXPORT_SYMBOL(xfrm_register_type);
181 
182 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
183 {
184         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
185         const struct xfrm_type **typemap;
186         int err = 0;
187 
188         if (unlikely(afinfo == NULL))
189                 return -EAFNOSUPPORT;
190         typemap = afinfo->type_map;
191         spin_lock_bh(&xfrm_type_lock);
192 
193         if (unlikely(typemap[type->proto] != type))
194                 err = -ENOENT;
195         else
196                 typemap[type->proto] = NULL;
197         spin_unlock_bh(&xfrm_type_lock);
198         xfrm_state_put_afinfo(afinfo);
199         return err;
200 }
201 EXPORT_SYMBOL(xfrm_unregister_type);
202 
203 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
204 {
205         struct xfrm_state_afinfo *afinfo;
206         const struct xfrm_type **typemap;
207         const struct xfrm_type *type;
208         int modload_attempted = 0;
209 
210 retry:
211         afinfo = xfrm_state_get_afinfo(family);
212         if (unlikely(afinfo == NULL))
213                 return NULL;
214         typemap = afinfo->type_map;
215 
216         type = typemap[proto];
217         if (unlikely(type && !try_module_get(type->owner)))
218                 type = NULL;
219         if (!type && !modload_attempted) {
220                 xfrm_state_put_afinfo(afinfo);
221                 request_module("xfrm-type-%d-%d", family, proto);
222                 modload_attempted = 1;
223                 goto retry;
224         }
225 
226         xfrm_state_put_afinfo(afinfo);
227         return type;
228 }
229 
230 static void xfrm_put_type(const struct xfrm_type *type)
231 {
232         module_put(type->owner);
233 }
234 
235 static DEFINE_SPINLOCK(xfrm_mode_lock);
236 int xfrm_register_mode(struct xfrm_mode *mode, int family)
237 {
238         struct xfrm_state_afinfo *afinfo;
239         struct xfrm_mode **modemap;
240         int err;
241 
242         if (unlikely(mode->encap >= XFRM_MODE_MAX))
243                 return -EINVAL;
244 
245         afinfo = xfrm_state_get_afinfo(family);
246         if (unlikely(afinfo == NULL))
247                 return -EAFNOSUPPORT;
248 
249         err = -EEXIST;
250         modemap = afinfo->mode_map;
251         spin_lock_bh(&xfrm_mode_lock);
252         if (modemap[mode->encap])
253                 goto out;
254 
255         err = -ENOENT;
256         if (!try_module_get(afinfo->owner))
257                 goto out;
258 
259         mode->afinfo = afinfo;
260         modemap[mode->encap] = mode;
261         err = 0;
262 
263 out:
264         spin_unlock_bh(&xfrm_mode_lock);
265         xfrm_state_put_afinfo(afinfo);
266         return err;
267 }
268 EXPORT_SYMBOL(xfrm_register_mode);
269 
270 int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
271 {
272         struct xfrm_state_afinfo *afinfo;
273         struct xfrm_mode **modemap;
274         int err;
275 
276         if (unlikely(mode->encap >= XFRM_MODE_MAX))
277                 return -EINVAL;
278 
279         afinfo = xfrm_state_get_afinfo(family);
280         if (unlikely(afinfo == NULL))
281                 return -EAFNOSUPPORT;
282 
283         err = -ENOENT;
284         modemap = afinfo->mode_map;
285         spin_lock_bh(&xfrm_mode_lock);
286         if (likely(modemap[mode->encap] == mode)) {
287                 modemap[mode->encap] = NULL;
288                 module_put(mode->afinfo->owner);
289                 err = 0;
290         }
291 
292         spin_unlock_bh(&xfrm_mode_lock);
293         xfrm_state_put_afinfo(afinfo);
294         return err;
295 }
296 EXPORT_SYMBOL(xfrm_unregister_mode);
297 
298 static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
299 {
300         struct xfrm_state_afinfo *afinfo;
301         struct xfrm_mode *mode;
302         int modload_attempted = 0;
303 
304         if (unlikely(encap >= XFRM_MODE_MAX))
305                 return NULL;
306 
307 retry:
308         afinfo = xfrm_state_get_afinfo(family);
309         if (unlikely(afinfo == NULL))
310                 return NULL;
311 
312         mode = afinfo->mode_map[encap];
313         if (unlikely(mode && !try_module_get(mode->owner)))
314                 mode = NULL;
315         if (!mode && !modload_attempted) {
316                 xfrm_state_put_afinfo(afinfo);
317                 request_module("xfrm-mode-%d-%d", family, encap);
318                 modload_attempted = 1;
319                 goto retry;
320         }
321 
322         xfrm_state_put_afinfo(afinfo);
323         return mode;
324 }
325 
326 static void xfrm_put_mode(struct xfrm_mode *mode)
327 {
328         module_put(mode->owner);
329 }
330 
331 static void xfrm_state_gc_destroy(struct xfrm_state *x)
332 {
333         tasklet_hrtimer_cancel(&x->mtimer);
334         del_timer_sync(&x->rtimer);
335         kfree(x->aead);
336         kfree(x->aalg);
337         kfree(x->ealg);
338         kfree(x->calg);
339         kfree(x->encap);
340         kfree(x->coaddr);
341         kfree(x->replay_esn);
342         kfree(x->preplay_esn);
343         if (x->inner_mode)
344                 xfrm_put_mode(x->inner_mode);
345         if (x->inner_mode_iaf)
346                 xfrm_put_mode(x->inner_mode_iaf);
347         if (x->outer_mode)
348                 xfrm_put_mode(x->outer_mode);
349         if (x->type) {
350                 x->type->destructor(x);
351                 xfrm_put_type(x->type);
352         }
353         security_xfrm_state_free(x);
354         kfree(x);
355 }
356 
357 static void xfrm_state_gc_task(struct work_struct *work)
358 {
359         struct net *net = container_of(work, struct net, xfrm.state_gc_work);
360         struct xfrm_state *x;
361         struct hlist_node *tmp;
362         struct hlist_head gc_list;
363 
364         spin_lock_bh(&xfrm_state_gc_lock);
365         hlist_move_list(&net->xfrm.state_gc_list, &gc_list);
366         spin_unlock_bh(&xfrm_state_gc_lock);
367 
368         hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
369                 xfrm_state_gc_destroy(x);
370 }
371 
372 static inline unsigned long make_jiffies(long secs)
373 {
374         if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
375                 return MAX_SCHEDULE_TIMEOUT-1;
376         else
377                 return secs*HZ;
378 }
379 
380 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
381 {
382         struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
383         struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
384         unsigned long now = get_seconds();
385         long next = LONG_MAX;
386         int warn = 0;
387         int err = 0;
388 
389         spin_lock(&x->lock);
390         if (x->km.state == XFRM_STATE_DEAD)
391                 goto out;
392         if (x->km.state == XFRM_STATE_EXPIRED)
393                 goto expired;
394         if (x->lft.hard_add_expires_seconds) {
395                 long tmo = x->lft.hard_add_expires_seconds +
396                         x->curlft.add_time - now;
397                 if (tmo <= 0) {
398                         if (x->xflags & XFRM_SOFT_EXPIRE) {
399                                 /* enter hard expire without soft expire first?!
400                                  * setting a new date could trigger this.
401                                  * workarbound: fix x->curflt.add_time by below:
402                                  */
403                                 x->curlft.add_time = now - x->saved_tmo - 1;
404                                 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
405                         } else
406                                 goto expired;
407                 }
408                 if (tmo < next)
409                         next = tmo;
410         }
411         if (x->lft.hard_use_expires_seconds) {
412                 long tmo = x->lft.hard_use_expires_seconds +
413                         (x->curlft.use_time ? : now) - now;
414                 if (tmo <= 0)
415                         goto expired;
416                 if (tmo < next)
417                         next = tmo;
418         }
419         if (x->km.dying)
420                 goto resched;
421         if (x->lft.soft_add_expires_seconds) {
422                 long tmo = x->lft.soft_add_expires_seconds +
423                         x->curlft.add_time - now;
424                 if (tmo <= 0) {
425                         warn = 1;
426                         x->xflags &= ~XFRM_SOFT_EXPIRE;
427                 } else if (tmo < next) {
428                         next = tmo;
429                         x->xflags |= XFRM_SOFT_EXPIRE;
430                         x->saved_tmo = tmo;
431                 }
432         }
433         if (x->lft.soft_use_expires_seconds) {
434                 long tmo = x->lft.soft_use_expires_seconds +
435                         (x->curlft.use_time ? : now) - now;
436                 if (tmo <= 0)
437                         warn = 1;
438                 else if (tmo < next)
439                         next = tmo;
440         }
441 
442         x->km.dying = warn;
443         if (warn)
444                 km_state_expired(x, 0, 0);
445 resched:
446         if (next != LONG_MAX) {
447                 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
448         }
449 
450         goto out;
451 
452 expired:
453         if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
454                 x->km.state = XFRM_STATE_EXPIRED;
455 
456         err = __xfrm_state_delete(x);
457         if (!err)
458                 km_state_expired(x, 1, 0);
459 
460         xfrm_audit_state_delete(x, err ? 0 : 1, true);
461 
462 out:
463         spin_unlock(&x->lock);
464         return HRTIMER_NORESTART;
465 }
466 
467 static void xfrm_replay_timer_handler(unsigned long data);
468 
469 struct xfrm_state *xfrm_state_alloc(struct net *net)
470 {
471         struct xfrm_state *x;
472 
473         x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
474 
475         if (x) {
476                 write_pnet(&x->xs_net, net);
477                 atomic_set(&x->refcnt, 1);
478                 atomic_set(&x->tunnel_users, 0);
479                 INIT_LIST_HEAD(&x->km.all);
480                 INIT_HLIST_NODE(&x->bydst);
481                 INIT_HLIST_NODE(&x->bysrc);
482                 INIT_HLIST_NODE(&x->byspi);
483                 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler,
484                                         CLOCK_BOOTTIME, HRTIMER_MODE_ABS);
485                 setup_timer(&x->rtimer, xfrm_replay_timer_handler,
486                                 (unsigned long)x);
487                 x->curlft.add_time = get_seconds();
488                 x->lft.soft_byte_limit = XFRM_INF;
489                 x->lft.soft_packet_limit = XFRM_INF;
490                 x->lft.hard_byte_limit = XFRM_INF;
491                 x->lft.hard_packet_limit = XFRM_INF;
492                 x->replay_maxage = 0;
493                 x->replay_maxdiff = 0;
494                 x->inner_mode = NULL;
495                 x->inner_mode_iaf = NULL;
496                 spin_lock_init(&x->lock);
497         }
498         return x;
499 }
500 EXPORT_SYMBOL(xfrm_state_alloc);
501 
502 void __xfrm_state_destroy(struct xfrm_state *x)
503 {
504         struct net *net = xs_net(x);
505 
506         WARN_ON(x->km.state != XFRM_STATE_DEAD);
507 
508         spin_lock_bh(&xfrm_state_gc_lock);
509         hlist_add_head(&x->gclist, &net->xfrm.state_gc_list);
510         spin_unlock_bh(&xfrm_state_gc_lock);
511         schedule_work(&net->xfrm.state_gc_work);
512 }
513 EXPORT_SYMBOL(__xfrm_state_destroy);
514 
515 int __xfrm_state_delete(struct xfrm_state *x)
516 {
517         struct net *net = xs_net(x);
518         int err = -ESRCH;
519 
520         if (x->km.state != XFRM_STATE_DEAD) {
521                 x->km.state = XFRM_STATE_DEAD;
522                 spin_lock(&net->xfrm.xfrm_state_lock);
523                 list_del(&x->km.all);
524                 hlist_del(&x->bydst);
525                 hlist_del(&x->bysrc);
526                 if (x->id.spi)
527                         hlist_del(&x->byspi);
528                 net->xfrm.state_num--;
529                 spin_unlock(&net->xfrm.xfrm_state_lock);
530 
531                 /* All xfrm_state objects are created by xfrm_state_alloc.
532                  * The xfrm_state_alloc call gives a reference, and that
533                  * is what we are dropping here.
534                  */
535                 xfrm_state_put(x);
536                 err = 0;
537         }
538 
539         return err;
540 }
541 EXPORT_SYMBOL(__xfrm_state_delete);
542 
543 int xfrm_state_delete(struct xfrm_state *x)
544 {
545         int err;
546 
547         spin_lock_bh(&x->lock);
548         err = __xfrm_state_delete(x);
549         spin_unlock_bh(&x->lock);
550 
551         return err;
552 }
553 EXPORT_SYMBOL(xfrm_state_delete);
554 
555 #ifdef CONFIG_SECURITY_NETWORK_XFRM
556 static inline int
557 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
558 {
559         int i, err = 0;
560 
561         for (i = 0; i <= net->xfrm.state_hmask; i++) {
562                 struct xfrm_state *x;
563 
564                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
565                         if (xfrm_id_proto_match(x->id.proto, proto) &&
566                            (err = security_xfrm_state_delete(x)) != 0) {
567                                 xfrm_audit_state_delete(x, 0, task_valid);
568                                 return err;
569                         }
570                 }
571         }
572 
573         return err;
574 }
575 #else
576 static inline int
577 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
578 {
579         return 0;
580 }
581 #endif
582 
583 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid)
584 {
585         int i, err = 0, cnt = 0;
586 
587         spin_lock_bh(&net->xfrm.xfrm_state_lock);
588         err = xfrm_state_flush_secctx_check(net, proto, task_valid);
589         if (err)
590                 goto out;
591 
592         err = -ESRCH;
593         for (i = 0; i <= net->xfrm.state_hmask; i++) {
594                 struct xfrm_state *x;
595 restart:
596                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
597                         if (!xfrm_state_kern(x) &&
598                             xfrm_id_proto_match(x->id.proto, proto)) {
599                                 xfrm_state_hold(x);
600                                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
601 
602                                 err = xfrm_state_delete(x);
603                                 xfrm_audit_state_delete(x, err ? 0 : 1,
604                                                         task_valid);
605                                 xfrm_state_put(x);
606                                 if (!err)
607                                         cnt++;
608 
609                                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
610                                 goto restart;
611                         }
612                 }
613         }
614         if (cnt)
615                 err = 0;
616 
617 out:
618         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
619         return err;
620 }
621 EXPORT_SYMBOL(xfrm_state_flush);
622 
623 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
624 {
625         spin_lock_bh(&net->xfrm.xfrm_state_lock);
626         si->sadcnt = net->xfrm.state_num;
627         si->sadhcnt = net->xfrm.state_hmask;
628         si->sadhmcnt = xfrm_state_hashmax;
629         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
630 }
631 EXPORT_SYMBOL(xfrm_sad_getinfo);
632 
633 static int
634 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
635                     const struct xfrm_tmpl *tmpl,
636                     const xfrm_address_t *daddr, const xfrm_address_t *saddr,
637                     unsigned short family)
638 {
639         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
640         if (!afinfo)
641                 return -1;
642         afinfo->init_tempsel(&x->sel, fl);
643 
644         if (family != tmpl->encap_family) {
645                 xfrm_state_put_afinfo(afinfo);
646                 afinfo = xfrm_state_get_afinfo(tmpl->encap_family);
647                 if (!afinfo)
648                         return -1;
649         }
650         afinfo->init_temprop(x, tmpl, daddr, saddr);
651         xfrm_state_put_afinfo(afinfo);
652         return 0;
653 }
654 
655 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
656                                               const xfrm_address_t *daddr,
657                                               __be32 spi, u8 proto,
658                                               unsigned short family)
659 {
660         unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
661         struct xfrm_state *x;
662 
663         hlist_for_each_entry(x, net->xfrm.state_byspi+h, byspi) {
664                 if (x->props.family != family ||
665                     x->id.spi       != spi ||
666                     x->id.proto     != proto ||
667                     !xfrm_addr_equal(&x->id.daddr, daddr, family))
668                         continue;
669 
670                 if ((mark & x->mark.m) != x->mark.v)
671                         continue;
672                 xfrm_state_hold(x);
673                 return x;
674         }
675 
676         return NULL;
677 }
678 
679 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
680                                                      const xfrm_address_t *daddr,
681                                                      const xfrm_address_t *saddr,
682                                                      u8 proto, unsigned short family)
683 {
684         unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
685         struct xfrm_state *x;
686 
687         hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
688                 if (x->props.family != family ||
689                     x->id.proto     != proto ||
690                     !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
691                     !xfrm_addr_equal(&x->props.saddr, saddr, family))
692                         continue;
693 
694                 if ((mark & x->mark.m) != x->mark.v)
695                         continue;
696                 xfrm_state_hold(x);
697                 return x;
698         }
699 
700         return NULL;
701 }
702 
703 static inline struct xfrm_state *
704 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
705 {
706         struct net *net = xs_net(x);
707         u32 mark = x->mark.v & x->mark.m;
708 
709         if (use_spi)
710                 return __xfrm_state_lookup(net, mark, &x->id.daddr,
711                                            x->id.spi, x->id.proto, family);
712         else
713                 return __xfrm_state_lookup_byaddr(net, mark,
714                                                   &x->id.daddr,
715                                                   &x->props.saddr,
716                                                   x->id.proto, family);
717 }
718 
719 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
720 {
721         if (have_hash_collision &&
722             (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
723             net->xfrm.state_num > net->xfrm.state_hmask)
724                 schedule_work(&net->xfrm.state_hash_work);
725 }
726 
727 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
728                                const struct flowi *fl, unsigned short family,
729                                struct xfrm_state **best, int *acq_in_progress,
730                                int *error)
731 {
732         /* Resolution logic:
733          * 1. There is a valid state with matching selector. Done.
734          * 2. Valid state with inappropriate selector. Skip.
735          *
736          * Entering area of "sysdeps".
737          *
738          * 3. If state is not valid, selector is temporary, it selects
739          *    only session which triggered previous resolution. Key
740          *    manager will do something to install a state with proper
741          *    selector.
742          */
743         if (x->km.state == XFRM_STATE_VALID) {
744                 if ((x->sel.family &&
745                      !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
746                     !security_xfrm_state_pol_flow_match(x, pol, fl))
747                         return;
748 
749                 if (!*best ||
750                     (*best)->km.dying > x->km.dying ||
751                     ((*best)->km.dying == x->km.dying &&
752                      (*best)->curlft.add_time < x->curlft.add_time))
753                         *best = x;
754         } else if (x->km.state == XFRM_STATE_ACQ) {
755                 *acq_in_progress = 1;
756         } else if (x->km.state == XFRM_STATE_ERROR ||
757                    x->km.state == XFRM_STATE_EXPIRED) {
758                 if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
759                     security_xfrm_state_pol_flow_match(x, pol, fl))
760                         *error = -ESRCH;
761         }
762 }
763 
764 struct xfrm_state *
765 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
766                 const struct flowi *fl, struct xfrm_tmpl *tmpl,
767                 struct xfrm_policy *pol, int *err,
768                 unsigned short family)
769 {
770         static xfrm_address_t saddr_wildcard = { };
771         struct net *net = xp_net(pol);
772         unsigned int h, h_wildcard;
773         struct xfrm_state *x, *x0, *to_put;
774         int acquire_in_progress = 0;
775         int error = 0;
776         struct xfrm_state *best = NULL;
777         u32 mark = pol->mark.v & pol->mark.m;
778         unsigned short encap_family = tmpl->encap_family;
779         struct km_event c;
780 
781         to_put = NULL;
782 
783         spin_lock_bh(&net->xfrm.xfrm_state_lock);
784         h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
785         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
786                 if (x->props.family == encap_family &&
787                     x->props.reqid == tmpl->reqid &&
788                     (mark & x->mark.m) == x->mark.v &&
789                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
790                     xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
791                     tmpl->mode == x->props.mode &&
792                     tmpl->id.proto == x->id.proto &&
793                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
794                         xfrm_state_look_at(pol, x, fl, encap_family,
795                                            &best, &acquire_in_progress, &error);
796         }
797         if (best || acquire_in_progress)
798                 goto found;
799 
800         h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
801         hlist_for_each_entry(x, net->xfrm.state_bydst+h_wildcard, bydst) {
802                 if (x->props.family == encap_family &&
803                     x->props.reqid == tmpl->reqid &&
804                     (mark & x->mark.m) == x->mark.v &&
805                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
806                     xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
807                     tmpl->mode == x->props.mode &&
808                     tmpl->id.proto == x->id.proto &&
809                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
810                         xfrm_state_look_at(pol, x, fl, encap_family,
811                                            &best, &acquire_in_progress, &error);
812         }
813 
814 found:
815         x = best;
816         if (!x && !error && !acquire_in_progress) {
817                 if (tmpl->id.spi &&
818                     (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
819                                               tmpl->id.proto, encap_family)) != NULL) {
820                         to_put = x0;
821                         error = -EEXIST;
822                         goto out;
823                 }
824 
825                 c.net = net;
826                 /* If the KMs have no listeners (yet...), avoid allocating an SA
827                  * for each and every packet - garbage collection might not
828                  * handle the flood.
829                  */
830                 if (!km_is_alive(&c)) {
831                         error = -ESRCH;
832                         goto out;
833                 }
834 
835                 x = xfrm_state_alloc(net);
836                 if (x == NULL) {
837                         error = -ENOMEM;
838                         goto out;
839                 }
840                 /* Initialize temporary state matching only
841                  * to current session. */
842                 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
843                 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
844 
845                 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
846                 if (error) {
847                         x->km.state = XFRM_STATE_DEAD;
848                         to_put = x;
849                         x = NULL;
850                         goto out;
851                 }
852 
853                 if (km_query(x, tmpl, pol) == 0) {
854                         x->km.state = XFRM_STATE_ACQ;
855                         list_add(&x->km.all, &net->xfrm.state_all);
856                         hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
857                         h = xfrm_src_hash(net, daddr, saddr, encap_family);
858                         hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
859                         if (x->id.spi) {
860                                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
861                                 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
862                         }
863                         x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
864                         tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
865                         net->xfrm.state_num++;
866                         xfrm_hash_grow_check(net, x->bydst.next != NULL);
867                 } else {
868                         x->km.state = XFRM_STATE_DEAD;
869                         to_put = x;
870                         x = NULL;
871                         error = -ESRCH;
872                 }
873         }
874 out:
875         if (x)
876                 xfrm_state_hold(x);
877         else
878                 *err = acquire_in_progress ? -EAGAIN : error;
879         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
880         if (to_put)
881                 xfrm_state_put(to_put);
882         return x;
883 }
884 
885 struct xfrm_state *
886 xfrm_stateonly_find(struct net *net, u32 mark,
887                     xfrm_address_t *daddr, xfrm_address_t *saddr,
888                     unsigned short family, u8 mode, u8 proto, u32 reqid)
889 {
890         unsigned int h;
891         struct xfrm_state *rx = NULL, *x = NULL;
892 
893         spin_lock_bh(&net->xfrm.xfrm_state_lock);
894         h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
895         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
896                 if (x->props.family == family &&
897                     x->props.reqid == reqid &&
898                     (mark & x->mark.m) == x->mark.v &&
899                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
900                     xfrm_state_addr_check(x, daddr, saddr, family) &&
901                     mode == x->props.mode &&
902                     proto == x->id.proto &&
903                     x->km.state == XFRM_STATE_VALID) {
904                         rx = x;
905                         break;
906                 }
907         }
908 
909         if (rx)
910                 xfrm_state_hold(rx);
911         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
912 
913 
914         return rx;
915 }
916 EXPORT_SYMBOL(xfrm_stateonly_find);
917 
918 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
919                                               unsigned short family)
920 {
921         struct xfrm_state *x;
922         struct xfrm_state_walk *w;
923 
924         spin_lock_bh(&net->xfrm.xfrm_state_lock);
925         list_for_each_entry(w, &net->xfrm.state_all, all) {
926                 x = container_of(w, struct xfrm_state, km);
927                 if (x->props.family != family ||
928                         x->id.spi != spi)
929                         continue;
930 
931                 xfrm_state_hold(x);
932                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
933                 return x;
934         }
935         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
936         return NULL;
937 }
938 EXPORT_SYMBOL(xfrm_state_lookup_byspi);
939 
940 static void __xfrm_state_insert(struct xfrm_state *x)
941 {
942         struct net *net = xs_net(x);
943         unsigned int h;
944 
945         list_add(&x->km.all, &net->xfrm.state_all);
946 
947         h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
948                           x->props.reqid, x->props.family);
949         hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
950 
951         h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
952         hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
953 
954         if (x->id.spi) {
955                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
956                                   x->props.family);
957 
958                 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
959         }
960 
961         tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
962         if (x->replay_maxage)
963                 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
964 
965         net->xfrm.state_num++;
966 
967         xfrm_hash_grow_check(net, x->bydst.next != NULL);
968 }
969 
970 /* net->xfrm.xfrm_state_lock is held */
971 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
972 {
973         struct net *net = xs_net(xnew);
974         unsigned short family = xnew->props.family;
975         u32 reqid = xnew->props.reqid;
976         struct xfrm_state *x;
977         unsigned int h;
978         u32 mark = xnew->mark.v & xnew->mark.m;
979 
980         h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
981         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
982                 if (x->props.family     == family &&
983                     x->props.reqid      == reqid &&
984                     (mark & x->mark.m) == x->mark.v &&
985                     xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
986                     xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
987                         x->genid++;
988         }
989 }
990 
991 void xfrm_state_insert(struct xfrm_state *x)
992 {
993         struct net *net = xs_net(x);
994 
995         spin_lock_bh(&net->xfrm.xfrm_state_lock);
996         __xfrm_state_bump_genids(x);
997         __xfrm_state_insert(x);
998         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
999 }
1000 EXPORT_SYMBOL(xfrm_state_insert);
1001 
1002 /* net->xfrm.xfrm_state_lock is held */
1003 static struct xfrm_state *__find_acq_core(struct net *net,
1004                                           const struct xfrm_mark *m,
1005                                           unsigned short family, u8 mode,
1006                                           u32 reqid, u8 proto,
1007                                           const xfrm_address_t *daddr,
1008                                           const xfrm_address_t *saddr,
1009                                           int create)
1010 {
1011         unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1012         struct xfrm_state *x;
1013         u32 mark = m->v & m->m;
1014 
1015         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1016                 if (x->props.reqid  != reqid ||
1017                     x->props.mode   != mode ||
1018                     x->props.family != family ||
1019                     x->km.state     != XFRM_STATE_ACQ ||
1020                     x->id.spi       != 0 ||
1021                     x->id.proto     != proto ||
1022                     (mark & x->mark.m) != x->mark.v ||
1023                     !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1024                     !xfrm_addr_equal(&x->props.saddr, saddr, family))
1025                         continue;
1026 
1027                 xfrm_state_hold(x);
1028                 return x;
1029         }
1030 
1031         if (!create)
1032                 return NULL;
1033 
1034         x = xfrm_state_alloc(net);
1035         if (likely(x)) {
1036                 switch (family) {
1037                 case AF_INET:
1038                         x->sel.daddr.a4 = daddr->a4;
1039                         x->sel.saddr.a4 = saddr->a4;
1040                         x->sel.prefixlen_d = 32;
1041                         x->sel.prefixlen_s = 32;
1042                         x->props.saddr.a4 = saddr->a4;
1043                         x->id.daddr.a4 = daddr->a4;
1044                         break;
1045 
1046                 case AF_INET6:
1047                         x->sel.daddr.in6 = daddr->in6;
1048                         x->sel.saddr.in6 = saddr->in6;
1049                         x->sel.prefixlen_d = 128;
1050                         x->sel.prefixlen_s = 128;
1051                         x->props.saddr.in6 = saddr->in6;
1052                         x->id.daddr.in6 = daddr->in6;
1053                         break;
1054                 }
1055 
1056                 x->km.state = XFRM_STATE_ACQ;
1057                 x->id.proto = proto;
1058                 x->props.family = family;
1059                 x->props.mode = mode;
1060                 x->props.reqid = reqid;
1061                 x->mark.v = m->v;
1062                 x->mark.m = m->m;
1063                 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1064                 xfrm_state_hold(x);
1065                 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1066                 list_add(&x->km.all, &net->xfrm.state_all);
1067                 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
1068                 h = xfrm_src_hash(net, daddr, saddr, family);
1069                 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
1070 
1071                 net->xfrm.state_num++;
1072 
1073                 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1074         }
1075 
1076         return x;
1077 }
1078 
1079 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1080 
1081 int xfrm_state_add(struct xfrm_state *x)
1082 {
1083         struct net *net = xs_net(x);
1084         struct xfrm_state *x1, *to_put;
1085         int family;
1086         int err;
1087         u32 mark = x->mark.v & x->mark.m;
1088         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1089 
1090         family = x->props.family;
1091 
1092         to_put = NULL;
1093 
1094         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1095 
1096         x1 = __xfrm_state_locate(x, use_spi, family);
1097         if (x1) {
1098                 to_put = x1;
1099                 x1 = NULL;
1100                 err = -EEXIST;
1101                 goto out;
1102         }
1103 
1104         if (use_spi && x->km.seq) {
1105                 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1106                 if (x1 && ((x1->id.proto != x->id.proto) ||
1107                     !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1108                         to_put = x1;
1109                         x1 = NULL;
1110                 }
1111         }
1112 
1113         if (use_spi && !x1)
1114                 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1115                                      x->props.reqid, x->id.proto,
1116                                      &x->id.daddr, &x->props.saddr, 0);
1117 
1118         __xfrm_state_bump_genids(x);
1119         __xfrm_state_insert(x);
1120         err = 0;
1121 
1122 out:
1123         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1124 
1125         if (x1) {
1126                 xfrm_state_delete(x1);
1127                 xfrm_state_put(x1);
1128         }
1129 
1130         if (to_put)
1131                 xfrm_state_put(to_put);
1132 
1133         return err;
1134 }
1135 EXPORT_SYMBOL(xfrm_state_add);
1136 
1137 #ifdef CONFIG_XFRM_MIGRATE
1138 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig)
1139 {
1140         struct net *net = xs_net(orig);
1141         struct xfrm_state *x = xfrm_state_alloc(net);
1142         if (!x)
1143                 goto out;
1144 
1145         memcpy(&x->id, &orig->id, sizeof(x->id));
1146         memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1147         memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1148         x->props.mode = orig->props.mode;
1149         x->props.replay_window = orig->props.replay_window;
1150         x->props.reqid = orig->props.reqid;
1151         x->props.family = orig->props.family;
1152         x->props.saddr = orig->props.saddr;
1153 
1154         if (orig->aalg) {
1155                 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1156                 if (!x->aalg)
1157                         goto error;
1158         }
1159         x->props.aalgo = orig->props.aalgo;
1160 
1161         if (orig->aead) {
1162                 x->aead = xfrm_algo_aead_clone(orig->aead);
1163                 if (!x->aead)
1164                         goto error;
1165         }
1166         if (orig->ealg) {
1167                 x->ealg = xfrm_algo_clone(orig->ealg);
1168                 if (!x->ealg)
1169                         goto error;
1170         }
1171         x->props.ealgo = orig->props.ealgo;
1172 
1173         if (orig->calg) {
1174                 x->calg = xfrm_algo_clone(orig->calg);
1175                 if (!x->calg)
1176                         goto error;
1177         }
1178         x->props.calgo = orig->props.calgo;
1179 
1180         if (orig->encap) {
1181                 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
1182                 if (!x->encap)
1183                         goto error;
1184         }
1185 
1186         if (orig->coaddr) {
1187                 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1188                                     GFP_KERNEL);
1189                 if (!x->coaddr)
1190                         goto error;
1191         }
1192 
1193         if (orig->replay_esn) {
1194                 if (xfrm_replay_clone(x, orig))
1195                         goto error;
1196         }
1197 
1198         memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1199 
1200         if (xfrm_init_state(x) < 0)
1201                 goto error;
1202 
1203         x->props.flags = orig->props.flags;
1204         x->props.extra_flags = orig->props.extra_flags;
1205 
1206         x->tfcpad = orig->tfcpad;
1207         x->replay_maxdiff = orig->replay_maxdiff;
1208         x->replay_maxage = orig->replay_maxage;
1209         x->curlft.add_time = orig->curlft.add_time;
1210         x->km.state = orig->km.state;
1211         x->km.seq = orig->km.seq;
1212 
1213         return x;
1214 
1215  error:
1216         xfrm_state_put(x);
1217 out:
1218         return NULL;
1219 }
1220 
1221 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net)
1222 {
1223         unsigned int h;
1224         struct xfrm_state *x = NULL;
1225 
1226         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1227 
1228         if (m->reqid) {
1229                 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
1230                                   m->reqid, m->old_family);
1231                 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1232                         if (x->props.mode != m->mode ||
1233                             x->id.proto != m->proto)
1234                                 continue;
1235                         if (m->reqid && x->props.reqid != m->reqid)
1236                                 continue;
1237                         if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1238                                              m->old_family) ||
1239                             !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1240                                              m->old_family))
1241                                 continue;
1242                         xfrm_state_hold(x);
1243                         break;
1244                 }
1245         } else {
1246                 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1247                                   m->old_family);
1248                 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1249                         if (x->props.mode != m->mode ||
1250                             x->id.proto != m->proto)
1251                                 continue;
1252                         if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1253                                              m->old_family) ||
1254                             !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1255                                              m->old_family))
1256                                 continue;
1257                         xfrm_state_hold(x);
1258                         break;
1259                 }
1260         }
1261 
1262         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1263 
1264         return x;
1265 }
1266 EXPORT_SYMBOL(xfrm_migrate_state_find);
1267 
1268 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1269                                       struct xfrm_migrate *m)
1270 {
1271         struct xfrm_state *xc;
1272 
1273         xc = xfrm_state_clone(x);
1274         if (!xc)
1275                 return NULL;
1276 
1277         memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1278         memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1279 
1280         /* add state */
1281         if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1282                 /* a care is needed when the destination address of the
1283                    state is to be updated as it is a part of triplet */
1284                 xfrm_state_insert(xc);
1285         } else {
1286                 if (xfrm_state_add(xc) < 0)
1287                         goto error;
1288         }
1289 
1290         return xc;
1291 error:
1292         xfrm_state_put(xc);
1293         return NULL;
1294 }
1295 EXPORT_SYMBOL(xfrm_state_migrate);
1296 #endif
1297 
1298 int xfrm_state_update(struct xfrm_state *x)
1299 {
1300         struct xfrm_state *x1, *to_put;
1301         int err;
1302         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1303         struct net *net = xs_net(x);
1304 
1305         to_put = NULL;
1306 
1307         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1308         x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1309 
1310         err = -ESRCH;
1311         if (!x1)
1312                 goto out;
1313 
1314         if (xfrm_state_kern(x1)) {
1315                 to_put = x1;
1316                 err = -EEXIST;
1317                 goto out;
1318         }
1319 
1320         if (x1->km.state == XFRM_STATE_ACQ) {
1321                 __xfrm_state_insert(x);
1322                 x = NULL;
1323         }
1324         err = 0;
1325 
1326 out:
1327         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1328 
1329         if (to_put)
1330                 xfrm_state_put(to_put);
1331 
1332         if (err)
1333                 return err;
1334 
1335         if (!x) {
1336                 xfrm_state_delete(x1);
1337                 xfrm_state_put(x1);
1338                 return 0;
1339         }
1340 
1341         err = -EINVAL;
1342         spin_lock_bh(&x1->lock);
1343         if (likely(x1->km.state == XFRM_STATE_VALID)) {
1344                 if (x->encap && x1->encap)
1345                         memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1346                 if (x->coaddr && x1->coaddr) {
1347                         memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1348                 }
1349                 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1350                         memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1351                 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1352                 x1->km.dying = 0;
1353 
1354                 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1355                 if (x1->curlft.use_time)
1356                         xfrm_state_check_expire(x1);
1357 
1358                 err = 0;
1359                 x->km.state = XFRM_STATE_DEAD;
1360                 __xfrm_state_put(x);
1361         }
1362         spin_unlock_bh(&x1->lock);
1363 
1364         xfrm_state_put(x1);
1365 
1366         return err;
1367 }
1368 EXPORT_SYMBOL(xfrm_state_update);
1369 
1370 int xfrm_state_check_expire(struct xfrm_state *x)
1371 {
1372         if (!x->curlft.use_time)
1373                 x->curlft.use_time = get_seconds();
1374 
1375         if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1376             x->curlft.packets >= x->lft.hard_packet_limit) {
1377                 x->km.state = XFRM_STATE_EXPIRED;
1378                 tasklet_hrtimer_start(&x->mtimer, ktime_set(0, 0), HRTIMER_MODE_REL);
1379                 return -EINVAL;
1380         }
1381 
1382         if (!x->km.dying &&
1383             (x->curlft.bytes >= x->lft.soft_byte_limit ||
1384              x->curlft.packets >= x->lft.soft_packet_limit)) {
1385                 x->km.dying = 1;
1386                 km_state_expired(x, 0, 0);
1387         }
1388         return 0;
1389 }
1390 EXPORT_SYMBOL(xfrm_state_check_expire);
1391 
1392 struct xfrm_state *
1393 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1394                   u8 proto, unsigned short family)
1395 {
1396         struct xfrm_state *x;
1397 
1398         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1399         x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1400         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1401         return x;
1402 }
1403 EXPORT_SYMBOL(xfrm_state_lookup);
1404 
1405 struct xfrm_state *
1406 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1407                          const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1408                          u8 proto, unsigned short family)
1409 {
1410         struct xfrm_state *x;
1411 
1412         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1413         x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1414         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1415         return x;
1416 }
1417 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1418 
1419 struct xfrm_state *
1420 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1421               u8 proto, const xfrm_address_t *daddr,
1422               const xfrm_address_t *saddr, int create, unsigned short family)
1423 {
1424         struct xfrm_state *x;
1425 
1426         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1427         x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create);
1428         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1429 
1430         return x;
1431 }
1432 EXPORT_SYMBOL(xfrm_find_acq);
1433 
1434 #ifdef CONFIG_XFRM_SUB_POLICY
1435 int
1436 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1437                unsigned short family, struct net *net)
1438 {
1439         int err = 0;
1440         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1441         if (!afinfo)
1442                 return -EAFNOSUPPORT;
1443 
1444         spin_lock_bh(&net->xfrm.xfrm_state_lock); /*FIXME*/
1445         if (afinfo->tmpl_sort)
1446                 err = afinfo->tmpl_sort(dst, src, n);
1447         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1448         xfrm_state_put_afinfo(afinfo);
1449         return err;
1450 }
1451 EXPORT_SYMBOL(xfrm_tmpl_sort);
1452 
1453 int
1454 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1455                 unsigned short family)
1456 {
1457         int err = 0;
1458         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1459         struct net *net = xs_net(*src);
1460 
1461         if (!afinfo)
1462                 return -EAFNOSUPPORT;
1463 
1464         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1465         if (afinfo->state_sort)
1466                 err = afinfo->state_sort(dst, src, n);
1467         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1468         xfrm_state_put_afinfo(afinfo);
1469         return err;
1470 }
1471 EXPORT_SYMBOL(xfrm_state_sort);
1472 #endif
1473 
1474 /* Silly enough, but I'm lazy to build resolution list */
1475 
1476 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1477 {
1478         int i;
1479 
1480         for (i = 0; i <= net->xfrm.state_hmask; i++) {
1481                 struct xfrm_state *x;
1482 
1483                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
1484                         if (x->km.seq == seq &&
1485                             (mark & x->mark.m) == x->mark.v &&
1486                             x->km.state == XFRM_STATE_ACQ) {
1487                                 xfrm_state_hold(x);
1488                                 return x;
1489                         }
1490                 }
1491         }
1492         return NULL;
1493 }
1494 
1495 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1496 {
1497         struct xfrm_state *x;
1498 
1499         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1500         x = __xfrm_find_acq_byseq(net, mark, seq);
1501         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1502         return x;
1503 }
1504 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1505 
1506 u32 xfrm_get_acqseq(void)
1507 {
1508         u32 res;
1509         static atomic_t acqseq;
1510 
1511         do {
1512                 res = atomic_inc_return(&acqseq);
1513         } while (!res);
1514 
1515         return res;
1516 }
1517 EXPORT_SYMBOL(xfrm_get_acqseq);
1518 
1519 int verify_spi_info(u8 proto, u32 min, u32 max)
1520 {
1521         switch (proto) {
1522         case IPPROTO_AH:
1523         case IPPROTO_ESP:
1524                 break;
1525 
1526         case IPPROTO_COMP:
1527                 /* IPCOMP spi is 16-bits. */
1528                 if (max >= 0x10000)
1529                         return -EINVAL;
1530                 break;
1531 
1532         default:
1533                 return -EINVAL;
1534         }
1535 
1536         if (min > max)
1537                 return -EINVAL;
1538 
1539         return 0;
1540 }
1541 EXPORT_SYMBOL(verify_spi_info);
1542 
1543 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1544 {
1545         struct net *net = xs_net(x);
1546         unsigned int h;
1547         struct xfrm_state *x0;
1548         int err = -ENOENT;
1549         __be32 minspi = htonl(low);
1550         __be32 maxspi = htonl(high);
1551         u32 mark = x->mark.v & x->mark.m;
1552 
1553         spin_lock_bh(&x->lock);
1554         if (x->km.state == XFRM_STATE_DEAD)
1555                 goto unlock;
1556 
1557         err = 0;
1558         if (x->id.spi)
1559                 goto unlock;
1560 
1561         err = -ENOENT;
1562 
1563         if (minspi == maxspi) {
1564                 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1565                 if (x0) {
1566                         xfrm_state_put(x0);
1567                         goto unlock;
1568                 }
1569                 x->id.spi = minspi;
1570         } else {
1571                 u32 spi = 0;
1572                 for (h = 0; h < high-low+1; h++) {
1573                         spi = low + prandom_u32()%(high-low+1);
1574                         x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1575                         if (x0 == NULL) {
1576                                 x->id.spi = htonl(spi);
1577                                 break;
1578                         }
1579                         xfrm_state_put(x0);
1580                 }
1581         }
1582         if (x->id.spi) {
1583                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1584                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1585                 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
1586                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1587 
1588                 err = 0;
1589         }
1590 
1591 unlock:
1592         spin_unlock_bh(&x->lock);
1593 
1594         return err;
1595 }
1596 EXPORT_SYMBOL(xfrm_alloc_spi);
1597 
1598 static bool __xfrm_state_filter_match(struct xfrm_state *x,
1599                                       struct xfrm_address_filter *filter)
1600 {
1601         if (filter) {
1602                 if ((filter->family == AF_INET ||
1603                      filter->family == AF_INET6) &&
1604                     x->props.family != filter->family)
1605                         return false;
1606 
1607                 return addr_match(&x->props.saddr, &filter->saddr,
1608                                   filter->splen) &&
1609                        addr_match(&x->id.daddr, &filter->daddr,
1610                                   filter->dplen);
1611         }
1612         return true;
1613 }
1614 
1615 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1616                     int (*func)(struct xfrm_state *, int, void*),
1617                     void *data)
1618 {
1619         struct xfrm_state *state;
1620         struct xfrm_state_walk *x;
1621         int err = 0;
1622 
1623         if (walk->seq != 0 && list_empty(&walk->all))
1624                 return 0;
1625 
1626         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1627         if (list_empty(&walk->all))
1628                 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1629         else
1630                 x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
1631         list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1632                 if (x->state == XFRM_STATE_DEAD)
1633                         continue;
1634                 state = container_of(x, struct xfrm_state, km);
1635                 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1636                         continue;
1637                 if (!__xfrm_state_filter_match(state, walk->filter))
1638                         continue;
1639                 err = func(state, walk->seq, data);
1640                 if (err) {
1641                         list_move_tail(&walk->all, &x->all);
1642                         goto out;
1643                 }
1644                 walk->seq++;
1645         }
1646         if (walk->seq == 0) {
1647                 err = -ENOENT;
1648                 goto out;
1649         }
1650         list_del_init(&walk->all);
1651 out:
1652         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1653         return err;
1654 }
1655 EXPORT_SYMBOL(xfrm_state_walk);
1656 
1657 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1658                           struct xfrm_address_filter *filter)
1659 {
1660         INIT_LIST_HEAD(&walk->all);
1661         walk->proto = proto;
1662         walk->state = XFRM_STATE_DEAD;
1663         walk->seq = 0;
1664         walk->filter = filter;
1665 }
1666 EXPORT_SYMBOL(xfrm_state_walk_init);
1667 
1668 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
1669 {
1670         kfree(walk->filter);
1671 
1672         if (list_empty(&walk->all))
1673                 return;
1674 
1675         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1676         list_del(&walk->all);
1677         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1678 }
1679 EXPORT_SYMBOL(xfrm_state_walk_done);
1680 
1681 static void xfrm_replay_timer_handler(unsigned long data)
1682 {
1683         struct xfrm_state *x = (struct xfrm_state *)data;
1684 
1685         spin_lock(&x->lock);
1686 
1687         if (x->km.state == XFRM_STATE_VALID) {
1688                 if (xfrm_aevent_is_on(xs_net(x)))
1689                         x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
1690                 else
1691                         x->xflags |= XFRM_TIME_DEFER;
1692         }
1693 
1694         spin_unlock(&x->lock);
1695 }
1696 
1697 static LIST_HEAD(xfrm_km_list);
1698 
1699 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1700 {
1701         struct xfrm_mgr *km;
1702 
1703         rcu_read_lock();
1704         list_for_each_entry_rcu(km, &xfrm_km_list, list)
1705                 if (km->notify_policy)
1706                         km->notify_policy(xp, dir, c);
1707         rcu_read_unlock();
1708 }
1709 
1710 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
1711 {
1712         struct xfrm_mgr *km;
1713         rcu_read_lock();
1714         list_for_each_entry_rcu(km, &xfrm_km_list, list)
1715                 if (km->notify)
1716                         km->notify(x, c);
1717         rcu_read_unlock();
1718 }
1719 
1720 EXPORT_SYMBOL(km_policy_notify);
1721 EXPORT_SYMBOL(km_state_notify);
1722 
1723 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
1724 {
1725         struct km_event c;
1726 
1727         c.data.hard = hard;
1728         c.portid = portid;
1729         c.event = XFRM_MSG_EXPIRE;
1730         km_state_notify(x, &c);
1731 }
1732 
1733 EXPORT_SYMBOL(km_state_expired);
1734 /*
1735  * We send to all registered managers regardless of failure
1736  * We are happy with one success
1737 */
1738 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1739 {
1740         int err = -EINVAL, acqret;
1741         struct xfrm_mgr *km;
1742 
1743         rcu_read_lock();
1744         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1745                 acqret = km->acquire(x, t, pol);
1746                 if (!acqret)
1747                         err = acqret;
1748         }
1749         rcu_read_unlock();
1750         return err;
1751 }
1752 EXPORT_SYMBOL(km_query);
1753 
1754 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1755 {
1756         int err = -EINVAL;
1757         struct xfrm_mgr *km;
1758 
1759         rcu_read_lock();
1760         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1761                 if (km->new_mapping)
1762                         err = km->new_mapping(x, ipaddr, sport);
1763                 if (!err)
1764                         break;
1765         }
1766         rcu_read_unlock();
1767         return err;
1768 }
1769 EXPORT_SYMBOL(km_new_mapping);
1770 
1771 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
1772 {
1773         struct km_event c;
1774 
1775         c.data.hard = hard;
1776         c.portid = portid;
1777         c.event = XFRM_MSG_POLEXPIRE;
1778         km_policy_notify(pol, dir, &c);
1779 }
1780 EXPORT_SYMBOL(km_policy_expired);
1781 
1782 #ifdef CONFIG_XFRM_MIGRATE
1783 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1784                const struct xfrm_migrate *m, int num_migrate,
1785                const struct xfrm_kmaddress *k)
1786 {
1787         int err = -EINVAL;
1788         int ret;
1789         struct xfrm_mgr *km;
1790 
1791         rcu_read_lock();
1792         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1793                 if (km->migrate) {
1794                         ret = km->migrate(sel, dir, type, m, num_migrate, k);
1795                         if (!ret)
1796                                 err = ret;
1797                 }
1798         }
1799         rcu_read_unlock();
1800         return err;
1801 }
1802 EXPORT_SYMBOL(km_migrate);
1803 #endif
1804 
1805 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1806 {
1807         int err = -EINVAL;
1808         int ret;
1809         struct xfrm_mgr *km;
1810 
1811         rcu_read_lock();
1812         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1813                 if (km->report) {
1814                         ret = km->report(net, proto, sel, addr);
1815                         if (!ret)
1816                                 err = ret;
1817                 }
1818         }
1819         rcu_read_unlock();
1820         return err;
1821 }
1822 EXPORT_SYMBOL(km_report);
1823 
1824 bool km_is_alive(const struct km_event *c)
1825 {
1826         struct xfrm_mgr *km;
1827         bool is_alive = false;
1828 
1829         rcu_read_lock();
1830         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1831                 if (km->is_alive && km->is_alive(c)) {
1832                         is_alive = true;
1833                         break;
1834                 }
1835         }
1836         rcu_read_unlock();
1837 
1838         return is_alive;
1839 }
1840 EXPORT_SYMBOL(km_is_alive);
1841 
1842 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1843 {
1844         int err;
1845         u8 *data;
1846         struct xfrm_mgr *km;
1847         struct xfrm_policy *pol = NULL;
1848 
1849         if (optlen <= 0 || optlen > PAGE_SIZE)
1850                 return -EMSGSIZE;
1851 
1852         data = kmalloc(optlen, GFP_KERNEL);
1853         if (!data)
1854                 return -ENOMEM;
1855 
1856         err = -EFAULT;
1857         if (copy_from_user(data, optval, optlen))
1858                 goto out;
1859 
1860         err = -EINVAL;
1861         rcu_read_lock();
1862         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1863                 pol = km->compile_policy(sk, optname, data,
1864                                          optlen, &err);
1865                 if (err >= 0)
1866                         break;
1867         }
1868         rcu_read_unlock();
1869 
1870         if (err >= 0) {
1871                 xfrm_sk_policy_insert(sk, err, pol);
1872                 xfrm_pol_put(pol);
1873                 err = 0;
1874         }
1875 
1876 out:
1877         kfree(data);
1878         return err;
1879 }
1880 EXPORT_SYMBOL(xfrm_user_policy);
1881 
1882 static DEFINE_SPINLOCK(xfrm_km_lock);
1883 
1884 int xfrm_register_km(struct xfrm_mgr *km)
1885 {
1886         spin_lock_bh(&xfrm_km_lock);
1887         list_add_tail_rcu(&km->list, &xfrm_km_list);
1888         spin_unlock_bh(&xfrm_km_lock);
1889         return 0;
1890 }
1891 EXPORT_SYMBOL(xfrm_register_km);
1892 
1893 int xfrm_unregister_km(struct xfrm_mgr *km)
1894 {
1895         spin_lock_bh(&xfrm_km_lock);
1896         list_del_rcu(&km->list);
1897         spin_unlock_bh(&xfrm_km_lock);
1898         synchronize_rcu();
1899         return 0;
1900 }
1901 EXPORT_SYMBOL(xfrm_unregister_km);
1902 
1903 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1904 {
1905         int err = 0;
1906         if (unlikely(afinfo == NULL))
1907                 return -EINVAL;
1908         if (unlikely(afinfo->family >= NPROTO))
1909                 return -EAFNOSUPPORT;
1910         spin_lock_bh(&xfrm_state_afinfo_lock);
1911         if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1912                 err = -EEXIST;
1913         else
1914                 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
1915         spin_unlock_bh(&xfrm_state_afinfo_lock);
1916         return err;
1917 }
1918 EXPORT_SYMBOL(xfrm_state_register_afinfo);
1919 
1920 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1921 {
1922         int err = 0;
1923         if (unlikely(afinfo == NULL))
1924                 return -EINVAL;
1925         if (unlikely(afinfo->family >= NPROTO))
1926                 return -EAFNOSUPPORT;
1927         spin_lock_bh(&xfrm_state_afinfo_lock);
1928         if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1929                 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1930                         err = -EINVAL;
1931                 else
1932                         RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
1933         }
1934         spin_unlock_bh(&xfrm_state_afinfo_lock);
1935         synchronize_rcu();
1936         return err;
1937 }
1938 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1939 
1940 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1941 {
1942         struct xfrm_state_afinfo *afinfo;
1943         if (unlikely(family >= NPROTO))
1944                 return NULL;
1945         rcu_read_lock();
1946         afinfo = rcu_dereference(xfrm_state_afinfo[family]);
1947         if (unlikely(!afinfo))
1948                 rcu_read_unlock();
1949         return afinfo;
1950 }
1951 
1952 void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
1953 {
1954         rcu_read_unlock();
1955 }
1956 
1957 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
1958 void xfrm_state_delete_tunnel(struct xfrm_state *x)
1959 {
1960         if (x->tunnel) {
1961                 struct xfrm_state *t = x->tunnel;
1962 
1963                 if (atomic_read(&t->tunnel_users) == 2)
1964                         xfrm_state_delete(t);
1965                 atomic_dec(&t->tunnel_users);
1966                 xfrm_state_put(t);
1967                 x->tunnel = NULL;
1968         }
1969 }
1970 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
1971 
1972 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
1973 {
1974         int res;
1975 
1976         spin_lock_bh(&x->lock);
1977         if (x->km.state == XFRM_STATE_VALID &&
1978             x->type && x->type->get_mtu)
1979                 res = x->type->get_mtu(x, mtu);
1980         else
1981                 res = mtu - x->props.header_len;
1982         spin_unlock_bh(&x->lock);
1983         return res;
1984 }
1985 
1986 int __xfrm_init_state(struct xfrm_state *x, bool init_replay)
1987 {
1988         struct xfrm_state_afinfo *afinfo;
1989         struct xfrm_mode *inner_mode;
1990         int family = x->props.family;
1991         int err;
1992 
1993         err = -EAFNOSUPPORT;
1994         afinfo = xfrm_state_get_afinfo(family);
1995         if (!afinfo)
1996                 goto error;
1997 
1998         err = 0;
1999         if (afinfo->init_flags)
2000                 err = afinfo->init_flags(x);
2001 
2002         xfrm_state_put_afinfo(afinfo);
2003 
2004         if (err)
2005                 goto error;
2006 
2007         err = -EPROTONOSUPPORT;
2008 
2009         if (x->sel.family != AF_UNSPEC) {
2010                 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2011                 if (inner_mode == NULL)
2012                         goto error;
2013 
2014                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2015                     family != x->sel.family) {
2016                         xfrm_put_mode(inner_mode);
2017                         goto error;
2018                 }
2019 
2020                 x->inner_mode = inner_mode;
2021         } else {
2022                 struct xfrm_mode *inner_mode_iaf;
2023                 int iafamily = AF_INET;
2024 
2025                 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2026                 if (inner_mode == NULL)
2027                         goto error;
2028 
2029                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
2030                         xfrm_put_mode(inner_mode);
2031                         goto error;
2032                 }
2033                 x->inner_mode = inner_mode;
2034 
2035                 if (x->props.family == AF_INET)
2036                         iafamily = AF_INET6;
2037 
2038                 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2039                 if (inner_mode_iaf) {
2040                         if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2041                                 x->inner_mode_iaf = inner_mode_iaf;
2042                         else
2043                                 xfrm_put_mode(inner_mode_iaf);
2044                 }
2045         }
2046 
2047         x->type = xfrm_get_type(x->id.proto, family);
2048         if (x->type == NULL)
2049                 goto error;
2050 
2051         err = x->type->init_state(x);
2052         if (err)
2053                 goto error;
2054 
2055         x->outer_mode = xfrm_get_mode(x->props.mode, family);
2056         if (x->outer_mode == NULL) {
2057                 err = -EPROTONOSUPPORT;
2058                 goto error;
2059         }
2060 
2061         if (init_replay) {
2062                 err = xfrm_init_replay(x);
2063                 if (err)
2064                         goto error;
2065         }
2066 
2067         x->km.state = XFRM_STATE_VALID;
2068 
2069 error:
2070         return err;
2071 }
2072 
2073 EXPORT_SYMBOL(__xfrm_init_state);
2074 
2075 int xfrm_init_state(struct xfrm_state *x)
2076 {
2077         return __xfrm_init_state(x, true);
2078 }
2079 
2080 EXPORT_SYMBOL(xfrm_init_state);
2081 
2082 int __net_init xfrm_state_init(struct net *net)
2083 {
2084         unsigned int sz;
2085 
2086         INIT_LIST_HEAD(&net->xfrm.state_all);
2087 
2088         sz = sizeof(struct hlist_head) * 8;
2089 
2090         net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2091         if (!net->xfrm.state_bydst)
2092                 goto out_bydst;
2093         net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2094         if (!net->xfrm.state_bysrc)
2095                 goto out_bysrc;
2096         net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2097         if (!net->xfrm.state_byspi)
2098                 goto out_byspi;
2099         net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2100 
2101         net->xfrm.state_num = 0;
2102         INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2103         INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
2104         INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
2105         spin_lock_init(&net->xfrm.xfrm_state_lock);
2106         return 0;
2107 
2108 out_byspi:
2109         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2110 out_bysrc:
2111         xfrm_hash_free(net->xfrm.state_bydst, sz);
2112 out_bydst:
2113         return -ENOMEM;
2114 }
2115 
2116 void xfrm_state_fini(struct net *net)
2117 {
2118         unsigned int sz;
2119 
2120         flush_work(&net->xfrm.state_hash_work);
2121         xfrm_state_flush(net, IPSEC_PROTO_ANY, false);
2122         flush_work(&net->xfrm.state_gc_work);
2123 
2124         WARN_ON(!list_empty(&net->xfrm.state_all));
2125 
2126         sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2127         WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2128         xfrm_hash_free(net->xfrm.state_byspi, sz);
2129         WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2130         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2131         WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2132         xfrm_hash_free(net->xfrm.state_bydst, sz);
2133 }
2134 
2135 #ifdef CONFIG_AUDITSYSCALL
2136 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2137                                      struct audit_buffer *audit_buf)
2138 {
2139         struct xfrm_sec_ctx *ctx = x->security;
2140         u32 spi = ntohl(x->id.spi);
2141 
2142         if (ctx)
2143                 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2144                                  ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2145 
2146         switch (x->props.family) {
2147         case AF_INET:
2148                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2149                                  &x->props.saddr.a4, &x->id.daddr.a4);
2150                 break;
2151         case AF_INET6:
2152                 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2153                                  x->props.saddr.a6, x->id.daddr.a6);
2154                 break;
2155         }
2156 
2157         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2158 }
2159 
2160 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2161                                       struct audit_buffer *audit_buf)
2162 {
2163         const struct iphdr *iph4;
2164         const struct ipv6hdr *iph6;
2165 
2166         switch (family) {
2167         case AF_INET:
2168                 iph4 = ip_hdr(skb);
2169                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2170                                  &iph4->saddr, &iph4->daddr);
2171                 break;
2172         case AF_INET6:
2173                 iph6 = ipv6_hdr(skb);
2174                 audit_log_format(audit_buf,
2175                                  " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2176                                  &iph6->saddr, &iph6->daddr,
2177                                  iph6->flow_lbl[0] & 0x0f,
2178                                  iph6->flow_lbl[1],
2179                                  iph6->flow_lbl[2]);
2180                 break;
2181         }
2182 }
2183 
2184 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
2185 {
2186         struct audit_buffer *audit_buf;
2187 
2188         audit_buf = xfrm_audit_start("SAD-add");
2189         if (audit_buf == NULL)
2190                 return;
2191         xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2192         xfrm_audit_helper_sainfo(x, audit_buf);
2193         audit_log_format(audit_buf, " res=%u", result);
2194         audit_log_end(audit_buf);
2195 }
2196 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2197 
2198 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
2199 {
2200         struct audit_buffer *audit_buf;
2201 
2202         audit_buf = xfrm_audit_start("SAD-delete");
2203         if (audit_buf == NULL)
2204                 return;
2205         xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2206         xfrm_audit_helper_sainfo(x, audit_buf);
2207         audit_log_format(audit_buf, " res=%u", result);
2208         audit_log_end(audit_buf);
2209 }
2210 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2211 
2212 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2213                                       struct sk_buff *skb)
2214 {
2215         struct audit_buffer *audit_buf;
2216         u32 spi;
2217 
2218         audit_buf = xfrm_audit_start("SA-replay-overflow");
2219         if (audit_buf == NULL)
2220                 return;
2221         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2222         /* don't record the sequence number because it's inherent in this kind
2223          * of audit message */
2224         spi = ntohl(x->id.spi);
2225         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2226         audit_log_end(audit_buf);
2227 }
2228 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2229 
2230 void xfrm_audit_state_replay(struct xfrm_state *x,
2231                              struct sk_buff *skb, __be32 net_seq)
2232 {
2233         struct audit_buffer *audit_buf;
2234         u32 spi;
2235 
2236         audit_buf = xfrm_audit_start("SA-replayed-pkt");
2237         if (audit_buf == NULL)
2238                 return;
2239         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2240         spi = ntohl(x->id.spi);
2241         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2242                          spi, spi, ntohl(net_seq));
2243         audit_log_end(audit_buf);
2244 }
2245 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2246 
2247 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2248 {
2249         struct audit_buffer *audit_buf;
2250 
2251         audit_buf = xfrm_audit_start("SA-notfound");
2252         if (audit_buf == NULL)
2253                 return;
2254         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2255         audit_log_end(audit_buf);
2256 }
2257 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2258 
2259 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2260                                __be32 net_spi, __be32 net_seq)
2261 {
2262         struct audit_buffer *audit_buf;
2263         u32 spi;
2264 
2265         audit_buf = xfrm_audit_start("SA-notfound");
2266         if (audit_buf == NULL)
2267                 return;
2268         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2269         spi = ntohl(net_spi);
2270         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2271                          spi, spi, ntohl(net_seq));
2272         audit_log_end(audit_buf);
2273 }
2274 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2275 
2276 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2277                               struct sk_buff *skb, u8 proto)
2278 {
2279         struct audit_buffer *audit_buf;
2280         __be32 net_spi;
2281         __be32 net_seq;
2282 
2283         audit_buf = xfrm_audit_start("SA-icv-failure");
2284         if (audit_buf == NULL)
2285                 return;
2286         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2287         if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2288                 u32 spi = ntohl(net_spi);
2289                 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2290                                  spi, spi, ntohl(net_seq));
2291         }
2292         audit_log_end(audit_buf);
2293 }
2294 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2295 #endif /* CONFIG_AUDITSYSCALL */
2296 

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