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

Version: ~ [ linux-5.4.2 ] ~ [ linux-5.3.15 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.88 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.158 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.206 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.206 ] ~ [ 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-3.16.78 ] ~ [ 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-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ 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->aalg);
336         kfree(x->ealg);
337         kfree(x->calg);
338         kfree(x->encap);
339         kfree(x->coaddr);
340         kfree(x->replay_esn);
341         kfree(x->preplay_esn);
342         if (x->inner_mode)
343                 xfrm_put_mode(x->inner_mode);
344         if (x->inner_mode_iaf)
345                 xfrm_put_mode(x->inner_mode_iaf);
346         if (x->outer_mode)
347                 xfrm_put_mode(x->outer_mode);
348         if (x->type) {
349                 x->type->destructor(x);
350                 xfrm_put_type(x->type);
351         }
352         security_xfrm_state_free(x);
353         kfree(x);
354 }
355 
356 static void xfrm_state_gc_task(struct work_struct *work)
357 {
358         struct net *net = container_of(work, struct net, xfrm.state_gc_work);
359         struct xfrm_state *x;
360         struct hlist_node *tmp;
361         struct hlist_head gc_list;
362 
363         spin_lock_bh(&xfrm_state_gc_lock);
364         hlist_move_list(&net->xfrm.state_gc_list, &gc_list);
365         spin_unlock_bh(&xfrm_state_gc_lock);
366 
367         hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
368                 xfrm_state_gc_destroy(x);
369 }
370 
371 static inline unsigned long make_jiffies(long secs)
372 {
373         if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
374                 return MAX_SCHEDULE_TIMEOUT-1;
375         else
376                 return secs*HZ;
377 }
378 
379 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
380 {
381         struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
382         struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
383         unsigned long now = get_seconds();
384         long next = LONG_MAX;
385         int warn = 0;
386         int err = 0;
387 
388         spin_lock(&x->lock);
389         if (x->km.state == XFRM_STATE_DEAD)
390                 goto out;
391         if (x->km.state == XFRM_STATE_EXPIRED)
392                 goto expired;
393         if (x->lft.hard_add_expires_seconds) {
394                 long tmo = x->lft.hard_add_expires_seconds +
395                         x->curlft.add_time - now;
396                 if (tmo <= 0) {
397                         if (x->xflags & XFRM_SOFT_EXPIRE) {
398                                 /* enter hard expire without soft expire first?!
399                                  * setting a new date could trigger this.
400                                  * workarbound: fix x->curflt.add_time by below:
401                                  */
402                                 x->curlft.add_time = now - x->saved_tmo - 1;
403                                 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
404                         } else
405                                 goto expired;
406                 }
407                 if (tmo < next)
408                         next = tmo;
409         }
410         if (x->lft.hard_use_expires_seconds) {
411                 long tmo = x->lft.hard_use_expires_seconds +
412                         (x->curlft.use_time ? : now) - now;
413                 if (tmo <= 0)
414                         goto expired;
415                 if (tmo < next)
416                         next = tmo;
417         }
418         if (x->km.dying)
419                 goto resched;
420         if (x->lft.soft_add_expires_seconds) {
421                 long tmo = x->lft.soft_add_expires_seconds +
422                         x->curlft.add_time - now;
423                 if (tmo <= 0) {
424                         warn = 1;
425                         x->xflags &= ~XFRM_SOFT_EXPIRE;
426                 } else if (tmo < next) {
427                         next = tmo;
428                         x->xflags |= XFRM_SOFT_EXPIRE;
429                         x->saved_tmo = tmo;
430                 }
431         }
432         if (x->lft.soft_use_expires_seconds) {
433                 long tmo = x->lft.soft_use_expires_seconds +
434                         (x->curlft.use_time ? : now) - now;
435                 if (tmo <= 0)
436                         warn = 1;
437                 else if (tmo < next)
438                         next = tmo;
439         }
440 
441         x->km.dying = warn;
442         if (warn)
443                 km_state_expired(x, 0, 0);
444 resched:
445         if (next != LONG_MAX) {
446                 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
447         }
448 
449         goto out;
450 
451 expired:
452         if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
453                 x->km.state = XFRM_STATE_EXPIRED;
454 
455         err = __xfrm_state_delete(x);
456         if (!err)
457                 km_state_expired(x, 1, 0);
458 
459         xfrm_audit_state_delete(x, err ? 0 : 1, true);
460 
461 out:
462         spin_unlock(&x->lock);
463         return HRTIMER_NORESTART;
464 }
465 
466 static void xfrm_replay_timer_handler(unsigned long data);
467 
468 struct xfrm_state *xfrm_state_alloc(struct net *net)
469 {
470         struct xfrm_state *x;
471 
472         x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
473 
474         if (x) {
475                 write_pnet(&x->xs_net, net);
476                 atomic_set(&x->refcnt, 1);
477                 atomic_set(&x->tunnel_users, 0);
478                 INIT_LIST_HEAD(&x->km.all);
479                 INIT_HLIST_NODE(&x->bydst);
480                 INIT_HLIST_NODE(&x->bysrc);
481                 INIT_HLIST_NODE(&x->byspi);
482                 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler,
483                                         CLOCK_BOOTTIME, HRTIMER_MODE_ABS);
484                 setup_timer(&x->rtimer, xfrm_replay_timer_handler,
485                                 (unsigned long)x);
486                 x->curlft.add_time = get_seconds();
487                 x->lft.soft_byte_limit = XFRM_INF;
488                 x->lft.soft_packet_limit = XFRM_INF;
489                 x->lft.hard_byte_limit = XFRM_INF;
490                 x->lft.hard_packet_limit = XFRM_INF;
491                 x->replay_maxage = 0;
492                 x->replay_maxdiff = 0;
493                 x->inner_mode = NULL;
494                 x->inner_mode_iaf = NULL;
495                 spin_lock_init(&x->lock);
496         }
497         return x;
498 }
499 EXPORT_SYMBOL(xfrm_state_alloc);
500 
501 void __xfrm_state_destroy(struct xfrm_state *x)
502 {
503         struct net *net = xs_net(x);
504 
505         WARN_ON(x->km.state != XFRM_STATE_DEAD);
506 
507         spin_lock_bh(&xfrm_state_gc_lock);
508         hlist_add_head(&x->gclist, &net->xfrm.state_gc_list);
509         spin_unlock_bh(&xfrm_state_gc_lock);
510         schedule_work(&net->xfrm.state_gc_work);
511 }
512 EXPORT_SYMBOL(__xfrm_state_destroy);
513 
514 int __xfrm_state_delete(struct xfrm_state *x)
515 {
516         struct net *net = xs_net(x);
517         int err = -ESRCH;
518 
519         if (x->km.state != XFRM_STATE_DEAD) {
520                 x->km.state = XFRM_STATE_DEAD;
521                 spin_lock(&net->xfrm.xfrm_state_lock);
522                 list_del(&x->km.all);
523                 hlist_del(&x->bydst);
524                 hlist_del(&x->bysrc);
525                 if (x->id.spi)
526                         hlist_del(&x->byspi);
527                 net->xfrm.state_num--;
528                 spin_unlock(&net->xfrm.xfrm_state_lock);
529 
530                 /* All xfrm_state objects are created by xfrm_state_alloc.
531                  * The xfrm_state_alloc call gives a reference, and that
532                  * is what we are dropping here.
533                  */
534                 xfrm_state_put(x);
535                 err = 0;
536         }
537 
538         return err;
539 }
540 EXPORT_SYMBOL(__xfrm_state_delete);
541 
542 int xfrm_state_delete(struct xfrm_state *x)
543 {
544         int err;
545 
546         spin_lock_bh(&x->lock);
547         err = __xfrm_state_delete(x);
548         spin_unlock_bh(&x->lock);
549 
550         return err;
551 }
552 EXPORT_SYMBOL(xfrm_state_delete);
553 
554 #ifdef CONFIG_SECURITY_NETWORK_XFRM
555 static inline int
556 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
557 {
558         int i, err = 0;
559 
560         for (i = 0; i <= net->xfrm.state_hmask; i++) {
561                 struct xfrm_state *x;
562 
563                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
564                         if (xfrm_id_proto_match(x->id.proto, proto) &&
565                            (err = security_xfrm_state_delete(x)) != 0) {
566                                 xfrm_audit_state_delete(x, 0, task_valid);
567                                 return err;
568                         }
569                 }
570         }
571 
572         return err;
573 }
574 #else
575 static inline int
576 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
577 {
578         return 0;
579 }
580 #endif
581 
582 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid)
583 {
584         int i, err = 0, cnt = 0;
585 
586         spin_lock_bh(&net->xfrm.xfrm_state_lock);
587         err = xfrm_state_flush_secctx_check(net, proto, task_valid);
588         if (err)
589                 goto out;
590 
591         err = -ESRCH;
592         for (i = 0; i <= net->xfrm.state_hmask; i++) {
593                 struct xfrm_state *x;
594 restart:
595                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
596                         if (!xfrm_state_kern(x) &&
597                             xfrm_id_proto_match(x->id.proto, proto)) {
598                                 xfrm_state_hold(x);
599                                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
600 
601                                 err = xfrm_state_delete(x);
602                                 xfrm_audit_state_delete(x, err ? 0 : 1,
603                                                         task_valid);
604                                 xfrm_state_put(x);
605                                 if (!err)
606                                         cnt++;
607 
608                                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
609                                 goto restart;
610                         }
611                 }
612         }
613         if (cnt)
614                 err = 0;
615 
616 out:
617         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
618         return err;
619 }
620 EXPORT_SYMBOL(xfrm_state_flush);
621 
622 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
623 {
624         spin_lock_bh(&net->xfrm.xfrm_state_lock);
625         si->sadcnt = net->xfrm.state_num;
626         si->sadhcnt = net->xfrm.state_hmask;
627         si->sadhmcnt = xfrm_state_hashmax;
628         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
629 }
630 EXPORT_SYMBOL(xfrm_sad_getinfo);
631 
632 static int
633 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
634                     const struct xfrm_tmpl *tmpl,
635                     const xfrm_address_t *daddr, const xfrm_address_t *saddr,
636                     unsigned short family)
637 {
638         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
639         if (!afinfo)
640                 return -1;
641         afinfo->init_tempsel(&x->sel, fl);
642 
643         if (family != tmpl->encap_family) {
644                 xfrm_state_put_afinfo(afinfo);
645                 afinfo = xfrm_state_get_afinfo(tmpl->encap_family);
646                 if (!afinfo)
647                         return -1;
648         }
649         afinfo->init_temprop(x, tmpl, daddr, saddr);
650         xfrm_state_put_afinfo(afinfo);
651         return 0;
652 }
653 
654 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
655                                               const xfrm_address_t *daddr,
656                                               __be32 spi, u8 proto,
657                                               unsigned short family)
658 {
659         unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
660         struct xfrm_state *x;
661 
662         hlist_for_each_entry(x, net->xfrm.state_byspi+h, byspi) {
663                 if (x->props.family != family ||
664                     x->id.spi       != spi ||
665                     x->id.proto     != proto ||
666                     !xfrm_addr_equal(&x->id.daddr, daddr, family))
667                         continue;
668 
669                 if ((mark & x->mark.m) != x->mark.v)
670                         continue;
671                 xfrm_state_hold(x);
672                 return x;
673         }
674 
675         return NULL;
676 }
677 
678 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
679                                                      const xfrm_address_t *daddr,
680                                                      const xfrm_address_t *saddr,
681                                                      u8 proto, unsigned short family)
682 {
683         unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
684         struct xfrm_state *x;
685 
686         hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
687                 if (x->props.family != family ||
688                     x->id.proto     != proto ||
689                     !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
690                     !xfrm_addr_equal(&x->props.saddr, saddr, family))
691                         continue;
692 
693                 if ((mark & x->mark.m) != x->mark.v)
694                         continue;
695                 xfrm_state_hold(x);
696                 return x;
697         }
698 
699         return NULL;
700 }
701 
702 static inline struct xfrm_state *
703 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
704 {
705         struct net *net = xs_net(x);
706         u32 mark = x->mark.v & x->mark.m;
707 
708         if (use_spi)
709                 return __xfrm_state_lookup(net, mark, &x->id.daddr,
710                                            x->id.spi, x->id.proto, family);
711         else
712                 return __xfrm_state_lookup_byaddr(net, mark,
713                                                   &x->id.daddr,
714                                                   &x->props.saddr,
715                                                   x->id.proto, family);
716 }
717 
718 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
719 {
720         if (have_hash_collision &&
721             (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
722             net->xfrm.state_num > net->xfrm.state_hmask)
723                 schedule_work(&net->xfrm.state_hash_work);
724 }
725 
726 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
727                                const struct flowi *fl, unsigned short family,
728                                struct xfrm_state **best, int *acq_in_progress,
729                                int *error)
730 {
731         /* Resolution logic:
732          * 1. There is a valid state with matching selector. Done.
733          * 2. Valid state with inappropriate selector. Skip.
734          *
735          * Entering area of "sysdeps".
736          *
737          * 3. If state is not valid, selector is temporary, it selects
738          *    only session which triggered previous resolution. Key
739          *    manager will do something to install a state with proper
740          *    selector.
741          */
742         if (x->km.state == XFRM_STATE_VALID) {
743                 if ((x->sel.family &&
744                      !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
745                     !security_xfrm_state_pol_flow_match(x, pol, fl))
746                         return;
747 
748                 if (!*best ||
749                     (*best)->km.dying > x->km.dying ||
750                     ((*best)->km.dying == x->km.dying &&
751                      (*best)->curlft.add_time < x->curlft.add_time))
752                         *best = x;
753         } else if (x->km.state == XFRM_STATE_ACQ) {
754                 *acq_in_progress = 1;
755         } else if (x->km.state == XFRM_STATE_ERROR ||
756                    x->km.state == XFRM_STATE_EXPIRED) {
757                 if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
758                     security_xfrm_state_pol_flow_match(x, pol, fl))
759                         *error = -ESRCH;
760         }
761 }
762 
763 struct xfrm_state *
764 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
765                 const struct flowi *fl, struct xfrm_tmpl *tmpl,
766                 struct xfrm_policy *pol, int *err,
767                 unsigned short family)
768 {
769         static xfrm_address_t saddr_wildcard = { };
770         struct net *net = xp_net(pol);
771         unsigned int h, h_wildcard;
772         struct xfrm_state *x, *x0, *to_put;
773         int acquire_in_progress = 0;
774         int error = 0;
775         struct xfrm_state *best = NULL;
776         u32 mark = pol->mark.v & pol->mark.m;
777         unsigned short encap_family = tmpl->encap_family;
778         struct km_event c;
779 
780         to_put = NULL;
781 
782         spin_lock_bh(&net->xfrm.xfrm_state_lock);
783         h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
784         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
785                 if (x->props.family == encap_family &&
786                     x->props.reqid == tmpl->reqid &&
787                     (mark & x->mark.m) == x->mark.v &&
788                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
789                     xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
790                     tmpl->mode == x->props.mode &&
791                     tmpl->id.proto == x->id.proto &&
792                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
793                         xfrm_state_look_at(pol, x, fl, encap_family,
794                                            &best, &acquire_in_progress, &error);
795         }
796         if (best || acquire_in_progress)
797                 goto found;
798 
799         h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
800         hlist_for_each_entry(x, net->xfrm.state_bydst+h_wildcard, bydst) {
801                 if (x->props.family == encap_family &&
802                     x->props.reqid == tmpl->reqid &&
803                     (mark & x->mark.m) == x->mark.v &&
804                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
805                     xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
806                     tmpl->mode == x->props.mode &&
807                     tmpl->id.proto == x->id.proto &&
808                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
809                         xfrm_state_look_at(pol, x, fl, encap_family,
810                                            &best, &acquire_in_progress, &error);
811         }
812 
813 found:
814         x = best;
815         if (!x && !error && !acquire_in_progress) {
816                 if (tmpl->id.spi &&
817                     (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
818                                               tmpl->id.proto, encap_family)) != NULL) {
819                         to_put = x0;
820                         error = -EEXIST;
821                         goto out;
822                 }
823 
824                 c.net = net;
825                 /* If the KMs have no listeners (yet...), avoid allocating an SA
826                  * for each and every packet - garbage collection might not
827                  * handle the flood.
828                  */
829                 if (!km_is_alive(&c)) {
830                         error = -ESRCH;
831                         goto out;
832                 }
833 
834                 x = xfrm_state_alloc(net);
835                 if (x == NULL) {
836                         error = -ENOMEM;
837                         goto out;
838                 }
839                 /* Initialize temporary state matching only
840                  * to current session. */
841                 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
842                 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
843 
844                 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
845                 if (error) {
846                         x->km.state = XFRM_STATE_DEAD;
847                         to_put = x;
848                         x = NULL;
849                         goto out;
850                 }
851 
852                 if (km_query(x, tmpl, pol) == 0) {
853                         x->km.state = XFRM_STATE_ACQ;
854                         list_add(&x->km.all, &net->xfrm.state_all);
855                         hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
856                         h = xfrm_src_hash(net, daddr, saddr, encap_family);
857                         hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
858                         if (x->id.spi) {
859                                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
860                                 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
861                         }
862                         x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
863                         tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
864                         net->xfrm.state_num++;
865                         xfrm_hash_grow_check(net, x->bydst.next != NULL);
866                 } else {
867                         x->km.state = XFRM_STATE_DEAD;
868                         to_put = x;
869                         x = NULL;
870                         error = -ESRCH;
871                 }
872         }
873 out:
874         if (x)
875                 xfrm_state_hold(x);
876         else
877                 *err = acquire_in_progress ? -EAGAIN : error;
878         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
879         if (to_put)
880                 xfrm_state_put(to_put);
881         return x;
882 }
883 
884 struct xfrm_state *
885 xfrm_stateonly_find(struct net *net, u32 mark,
886                     xfrm_address_t *daddr, xfrm_address_t *saddr,
887                     unsigned short family, u8 mode, u8 proto, u32 reqid)
888 {
889         unsigned int h;
890         struct xfrm_state *rx = NULL, *x = NULL;
891 
892         spin_lock_bh(&net->xfrm.xfrm_state_lock);
893         h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
894         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
895                 if (x->props.family == family &&
896                     x->props.reqid == reqid &&
897                     (mark & x->mark.m) == x->mark.v &&
898                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
899                     xfrm_state_addr_check(x, daddr, saddr, family) &&
900                     mode == x->props.mode &&
901                     proto == x->id.proto &&
902                     x->km.state == XFRM_STATE_VALID) {
903                         rx = x;
904                         break;
905                 }
906         }
907 
908         if (rx)
909                 xfrm_state_hold(rx);
910         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
911 
912 
913         return rx;
914 }
915 EXPORT_SYMBOL(xfrm_stateonly_find);
916 
917 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
918                                               unsigned short family)
919 {
920         struct xfrm_state *x;
921         struct xfrm_state_walk *w;
922 
923         spin_lock_bh(&net->xfrm.xfrm_state_lock);
924         list_for_each_entry(w, &net->xfrm.state_all, all) {
925                 x = container_of(w, struct xfrm_state, km);
926                 if (x->props.family != family ||
927                         x->id.spi != spi)
928                         continue;
929 
930                 xfrm_state_hold(x);
931                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
932                 return x;
933         }
934         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
935         return NULL;
936 }
937 EXPORT_SYMBOL(xfrm_state_lookup_byspi);
938 
939 static void __xfrm_state_insert(struct xfrm_state *x)
940 {
941         struct net *net = xs_net(x);
942         unsigned int h;
943 
944         list_add(&x->km.all, &net->xfrm.state_all);
945 
946         h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
947                           x->props.reqid, x->props.family);
948         hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
949 
950         h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
951         hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
952 
953         if (x->id.spi) {
954                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
955                                   x->props.family);
956 
957                 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
958         }
959 
960         tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
961         if (x->replay_maxage)
962                 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
963 
964         net->xfrm.state_num++;
965 
966         xfrm_hash_grow_check(net, x->bydst.next != NULL);
967 }
968 
969 /* net->xfrm.xfrm_state_lock is held */
970 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
971 {
972         struct net *net = xs_net(xnew);
973         unsigned short family = xnew->props.family;
974         u32 reqid = xnew->props.reqid;
975         struct xfrm_state *x;
976         unsigned int h;
977         u32 mark = xnew->mark.v & xnew->mark.m;
978 
979         h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
980         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
981                 if (x->props.family     == family &&
982                     x->props.reqid      == reqid &&
983                     (mark & x->mark.m) == x->mark.v &&
984                     xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
985                     xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
986                         x->genid++;
987         }
988 }
989 
990 void xfrm_state_insert(struct xfrm_state *x)
991 {
992         struct net *net = xs_net(x);
993 
994         spin_lock_bh(&net->xfrm.xfrm_state_lock);
995         __xfrm_state_bump_genids(x);
996         __xfrm_state_insert(x);
997         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
998 }
999 EXPORT_SYMBOL(xfrm_state_insert);
1000 
1001 /* net->xfrm.xfrm_state_lock is held */
1002 static struct xfrm_state *__find_acq_core(struct net *net,
1003                                           const struct xfrm_mark *m,
1004                                           unsigned short family, u8 mode,
1005                                           u32 reqid, u8 proto,
1006                                           const xfrm_address_t *daddr,
1007                                           const xfrm_address_t *saddr,
1008                                           int create)
1009 {
1010         unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1011         struct xfrm_state *x;
1012         u32 mark = m->v & m->m;
1013 
1014         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1015                 if (x->props.reqid  != reqid ||
1016                     x->props.mode   != mode ||
1017                     x->props.family != family ||
1018                     x->km.state     != XFRM_STATE_ACQ ||
1019                     x->id.spi       != 0 ||
1020                     x->id.proto     != proto ||
1021                     (mark & x->mark.m) != x->mark.v ||
1022                     !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1023                     !xfrm_addr_equal(&x->props.saddr, saddr, family))
1024                         continue;
1025 
1026                 xfrm_state_hold(x);
1027                 return x;
1028         }
1029 
1030         if (!create)
1031                 return NULL;
1032 
1033         x = xfrm_state_alloc(net);
1034         if (likely(x)) {
1035                 switch (family) {
1036                 case AF_INET:
1037                         x->sel.daddr.a4 = daddr->a4;
1038                         x->sel.saddr.a4 = saddr->a4;
1039                         x->sel.prefixlen_d = 32;
1040                         x->sel.prefixlen_s = 32;
1041                         x->props.saddr.a4 = saddr->a4;
1042                         x->id.daddr.a4 = daddr->a4;
1043                         break;
1044 
1045                 case AF_INET6:
1046                         x->sel.daddr.in6 = daddr->in6;
1047                         x->sel.saddr.in6 = saddr->in6;
1048                         x->sel.prefixlen_d = 128;
1049                         x->sel.prefixlen_s = 128;
1050                         x->props.saddr.in6 = saddr->in6;
1051                         x->id.daddr.in6 = daddr->in6;
1052                         break;
1053                 }
1054 
1055                 x->km.state = XFRM_STATE_ACQ;
1056                 x->id.proto = proto;
1057                 x->props.family = family;
1058                 x->props.mode = mode;
1059                 x->props.reqid = reqid;
1060                 x->mark.v = m->v;
1061                 x->mark.m = m->m;
1062                 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1063                 xfrm_state_hold(x);
1064                 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1065                 list_add(&x->km.all, &net->xfrm.state_all);
1066                 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
1067                 h = xfrm_src_hash(net, daddr, saddr, family);
1068                 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
1069 
1070                 net->xfrm.state_num++;
1071 
1072                 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1073         }
1074 
1075         return x;
1076 }
1077 
1078 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1079 
1080 int xfrm_state_add(struct xfrm_state *x)
1081 {
1082         struct net *net = xs_net(x);
1083         struct xfrm_state *x1, *to_put;
1084         int family;
1085         int err;
1086         u32 mark = x->mark.v & x->mark.m;
1087         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1088 
1089         family = x->props.family;
1090 
1091         to_put = NULL;
1092 
1093         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1094 
1095         x1 = __xfrm_state_locate(x, use_spi, family);
1096         if (x1) {
1097                 to_put = x1;
1098                 x1 = NULL;
1099                 err = -EEXIST;
1100                 goto out;
1101         }
1102 
1103         if (use_spi && x->km.seq) {
1104                 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1105                 if (x1 && ((x1->id.proto != x->id.proto) ||
1106                     !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1107                         to_put = x1;
1108                         x1 = NULL;
1109                 }
1110         }
1111 
1112         if (use_spi && !x1)
1113                 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1114                                      x->props.reqid, x->id.proto,
1115                                      &x->id.daddr, &x->props.saddr, 0);
1116 
1117         __xfrm_state_bump_genids(x);
1118         __xfrm_state_insert(x);
1119         err = 0;
1120 
1121 out:
1122         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1123 
1124         if (x1) {
1125                 xfrm_state_delete(x1);
1126                 xfrm_state_put(x1);
1127         }
1128 
1129         if (to_put)
1130                 xfrm_state_put(to_put);
1131 
1132         return err;
1133 }
1134 EXPORT_SYMBOL(xfrm_state_add);
1135 
1136 #ifdef CONFIG_XFRM_MIGRATE
1137 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig)
1138 {
1139         struct net *net = xs_net(orig);
1140         struct xfrm_state *x = xfrm_state_alloc(net);
1141         if (!x)
1142                 goto out;
1143 
1144         memcpy(&x->id, &orig->id, sizeof(x->id));
1145         memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1146         memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1147         x->props.mode = orig->props.mode;
1148         x->props.replay_window = orig->props.replay_window;
1149         x->props.reqid = orig->props.reqid;
1150         x->props.family = orig->props.family;
1151         x->props.saddr = orig->props.saddr;
1152 
1153         if (orig->aalg) {
1154                 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1155                 if (!x->aalg)
1156                         goto error;
1157         }
1158         x->props.aalgo = orig->props.aalgo;
1159 
1160         if (orig->aead) {
1161                 x->aead = xfrm_algo_aead_clone(orig->aead);
1162                 if (!x->aead)
1163                         goto error;
1164         }
1165         if (orig->ealg) {
1166                 x->ealg = xfrm_algo_clone(orig->ealg);
1167                 if (!x->ealg)
1168                         goto error;
1169         }
1170         x->props.ealgo = orig->props.ealgo;
1171 
1172         if (orig->calg) {
1173                 x->calg = xfrm_algo_clone(orig->calg);
1174                 if (!x->calg)
1175                         goto error;
1176         }
1177         x->props.calgo = orig->props.calgo;
1178 
1179         if (orig->encap) {
1180                 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
1181                 if (!x->encap)
1182                         goto error;
1183         }
1184 
1185         if (orig->coaddr) {
1186                 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1187                                     GFP_KERNEL);
1188                 if (!x->coaddr)
1189                         goto error;
1190         }
1191 
1192         if (orig->replay_esn) {
1193                 if (xfrm_replay_clone(x, orig))
1194                         goto error;
1195         }
1196 
1197         memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1198 
1199         if (xfrm_init_state(x) < 0)
1200                 goto error;
1201 
1202         x->props.flags = orig->props.flags;
1203         x->props.extra_flags = orig->props.extra_flags;
1204 
1205         x->tfcpad = orig->tfcpad;
1206         x->replay_maxdiff = orig->replay_maxdiff;
1207         x->replay_maxage = orig->replay_maxage;
1208         x->curlft.add_time = orig->curlft.add_time;
1209         x->km.state = orig->km.state;
1210         x->km.seq = orig->km.seq;
1211 
1212         return x;
1213 
1214  error:
1215         xfrm_state_put(x);
1216 out:
1217         return NULL;
1218 }
1219 
1220 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net)
1221 {
1222         unsigned int h;
1223         struct xfrm_state *x = NULL;
1224 
1225         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1226 
1227         if (m->reqid) {
1228                 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
1229                                   m->reqid, m->old_family);
1230                 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1231                         if (x->props.mode != m->mode ||
1232                             x->id.proto != m->proto)
1233                                 continue;
1234                         if (m->reqid && x->props.reqid != m->reqid)
1235                                 continue;
1236                         if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1237                                              m->old_family) ||
1238                             !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1239                                              m->old_family))
1240                                 continue;
1241                         xfrm_state_hold(x);
1242                         break;
1243                 }
1244         } else {
1245                 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1246                                   m->old_family);
1247                 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1248                         if (x->props.mode != m->mode ||
1249                             x->id.proto != m->proto)
1250                                 continue;
1251                         if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1252                                              m->old_family) ||
1253                             !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1254                                              m->old_family))
1255                                 continue;
1256                         xfrm_state_hold(x);
1257                         break;
1258                 }
1259         }
1260 
1261         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1262 
1263         return x;
1264 }
1265 EXPORT_SYMBOL(xfrm_migrate_state_find);
1266 
1267 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1268                                       struct xfrm_migrate *m)
1269 {
1270         struct xfrm_state *xc;
1271 
1272         xc = xfrm_state_clone(x);
1273         if (!xc)
1274                 return NULL;
1275 
1276         memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1277         memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1278 
1279         /* add state */
1280         if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1281                 /* a care is needed when the destination address of the
1282                    state is to be updated as it is a part of triplet */
1283                 xfrm_state_insert(xc);
1284         } else {
1285                 if (xfrm_state_add(xc) < 0)
1286                         goto error;
1287         }
1288 
1289         return xc;
1290 error:
1291         xfrm_state_put(xc);
1292         return NULL;
1293 }
1294 EXPORT_SYMBOL(xfrm_state_migrate);
1295 #endif
1296 
1297 int xfrm_state_update(struct xfrm_state *x)
1298 {
1299         struct xfrm_state *x1, *to_put;
1300         int err;
1301         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1302         struct net *net = xs_net(x);
1303 
1304         to_put = NULL;
1305 
1306         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1307         x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1308 
1309         err = -ESRCH;
1310         if (!x1)
1311                 goto out;
1312 
1313         if (xfrm_state_kern(x1)) {
1314                 to_put = x1;
1315                 err = -EEXIST;
1316                 goto out;
1317         }
1318 
1319         if (x1->km.state == XFRM_STATE_ACQ) {
1320                 __xfrm_state_insert(x);
1321                 x = NULL;
1322         }
1323         err = 0;
1324 
1325 out:
1326         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1327 
1328         if (to_put)
1329                 xfrm_state_put(to_put);
1330 
1331         if (err)
1332                 return err;
1333 
1334         if (!x) {
1335                 xfrm_state_delete(x1);
1336                 xfrm_state_put(x1);
1337                 return 0;
1338         }
1339 
1340         err = -EINVAL;
1341         spin_lock_bh(&x1->lock);
1342         if (likely(x1->km.state == XFRM_STATE_VALID)) {
1343                 if (x->encap && x1->encap)
1344                         memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1345                 if (x->coaddr && x1->coaddr) {
1346                         memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1347                 }
1348                 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1349                         memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1350                 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1351                 x1->km.dying = 0;
1352 
1353                 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1354                 if (x1->curlft.use_time)
1355                         xfrm_state_check_expire(x1);
1356 
1357                 err = 0;
1358                 x->km.state = XFRM_STATE_DEAD;
1359                 __xfrm_state_put(x);
1360         }
1361         spin_unlock_bh(&x1->lock);
1362 
1363         xfrm_state_put(x1);
1364 
1365         return err;
1366 }
1367 EXPORT_SYMBOL(xfrm_state_update);
1368 
1369 int xfrm_state_check_expire(struct xfrm_state *x)
1370 {
1371         if (!x->curlft.use_time)
1372                 x->curlft.use_time = get_seconds();
1373 
1374         if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1375             x->curlft.packets >= x->lft.hard_packet_limit) {
1376                 x->km.state = XFRM_STATE_EXPIRED;
1377                 tasklet_hrtimer_start(&x->mtimer, ktime_set(0, 0), HRTIMER_MODE_REL);
1378                 return -EINVAL;
1379         }
1380 
1381         if (!x->km.dying &&
1382             (x->curlft.bytes >= x->lft.soft_byte_limit ||
1383              x->curlft.packets >= x->lft.soft_packet_limit)) {
1384                 x->km.dying = 1;
1385                 km_state_expired(x, 0, 0);
1386         }
1387         return 0;
1388 }
1389 EXPORT_SYMBOL(xfrm_state_check_expire);
1390 
1391 struct xfrm_state *
1392 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1393                   u8 proto, unsigned short family)
1394 {
1395         struct xfrm_state *x;
1396 
1397         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1398         x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1399         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1400         return x;
1401 }
1402 EXPORT_SYMBOL(xfrm_state_lookup);
1403 
1404 struct xfrm_state *
1405 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1406                          const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1407                          u8 proto, unsigned short family)
1408 {
1409         struct xfrm_state *x;
1410 
1411         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1412         x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1413         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1414         return x;
1415 }
1416 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1417 
1418 struct xfrm_state *
1419 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1420               u8 proto, const xfrm_address_t *daddr,
1421               const xfrm_address_t *saddr, int create, unsigned short family)
1422 {
1423         struct xfrm_state *x;
1424 
1425         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1426         x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create);
1427         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1428 
1429         return x;
1430 }
1431 EXPORT_SYMBOL(xfrm_find_acq);
1432 
1433 #ifdef CONFIG_XFRM_SUB_POLICY
1434 int
1435 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1436                unsigned short family, struct net *net)
1437 {
1438         int err = 0;
1439         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1440         if (!afinfo)
1441                 return -EAFNOSUPPORT;
1442 
1443         spin_lock_bh(&net->xfrm.xfrm_state_lock); /*FIXME*/
1444         if (afinfo->tmpl_sort)
1445                 err = afinfo->tmpl_sort(dst, src, n);
1446         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1447         xfrm_state_put_afinfo(afinfo);
1448         return err;
1449 }
1450 EXPORT_SYMBOL(xfrm_tmpl_sort);
1451 
1452 int
1453 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1454                 unsigned short family)
1455 {
1456         int err = 0;
1457         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1458         struct net *net = xs_net(*src);
1459 
1460         if (!afinfo)
1461                 return -EAFNOSUPPORT;
1462 
1463         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1464         if (afinfo->state_sort)
1465                 err = afinfo->state_sort(dst, src, n);
1466         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1467         xfrm_state_put_afinfo(afinfo);
1468         return err;
1469 }
1470 EXPORT_SYMBOL(xfrm_state_sort);
1471 #endif
1472 
1473 /* Silly enough, but I'm lazy to build resolution list */
1474 
1475 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1476 {
1477         int i;
1478 
1479         for (i = 0; i <= net->xfrm.state_hmask; i++) {
1480                 struct xfrm_state *x;
1481 
1482                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
1483                         if (x->km.seq == seq &&
1484                             (mark & x->mark.m) == x->mark.v &&
1485                             x->km.state == XFRM_STATE_ACQ) {
1486                                 xfrm_state_hold(x);
1487                                 return x;
1488                         }
1489                 }
1490         }
1491         return NULL;
1492 }
1493 
1494 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1495 {
1496         struct xfrm_state *x;
1497 
1498         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1499         x = __xfrm_find_acq_byseq(net, mark, seq);
1500         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1501         return x;
1502 }
1503 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1504 
1505 u32 xfrm_get_acqseq(void)
1506 {
1507         u32 res;
1508         static atomic_t acqseq;
1509 
1510         do {
1511                 res = atomic_inc_return(&acqseq);
1512         } while (!res);
1513 
1514         return res;
1515 }
1516 EXPORT_SYMBOL(xfrm_get_acqseq);
1517 
1518 int verify_spi_info(u8 proto, u32 min, u32 max)
1519 {
1520         switch (proto) {
1521         case IPPROTO_AH:
1522         case IPPROTO_ESP:
1523                 break;
1524 
1525         case IPPROTO_COMP:
1526                 /* IPCOMP spi is 16-bits. */
1527                 if (max >= 0x10000)
1528                         return -EINVAL;
1529                 break;
1530 
1531         default:
1532                 return -EINVAL;
1533         }
1534 
1535         if (min > max)
1536                 return -EINVAL;
1537 
1538         return 0;
1539 }
1540 EXPORT_SYMBOL(verify_spi_info);
1541 
1542 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1543 {
1544         struct net *net = xs_net(x);
1545         unsigned int h;
1546         struct xfrm_state *x0;
1547         int err = -ENOENT;
1548         __be32 minspi = htonl(low);
1549         __be32 maxspi = htonl(high);
1550         u32 mark = x->mark.v & x->mark.m;
1551 
1552         spin_lock_bh(&x->lock);
1553         if (x->km.state == XFRM_STATE_DEAD)
1554                 goto unlock;
1555 
1556         err = 0;
1557         if (x->id.spi)
1558                 goto unlock;
1559 
1560         err = -ENOENT;
1561 
1562         if (minspi == maxspi) {
1563                 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1564                 if (x0) {
1565                         xfrm_state_put(x0);
1566                         goto unlock;
1567                 }
1568                 x->id.spi = minspi;
1569         } else {
1570                 u32 spi = 0;
1571                 for (h = 0; h < high-low+1; h++) {
1572                         spi = low + prandom_u32()%(high-low+1);
1573                         x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1574                         if (x0 == NULL) {
1575                                 x->id.spi = htonl(spi);
1576                                 break;
1577                         }
1578                         xfrm_state_put(x0);
1579                 }
1580         }
1581         if (x->id.spi) {
1582                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1583                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1584                 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
1585                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1586 
1587                 err = 0;
1588         }
1589 
1590 unlock:
1591         spin_unlock_bh(&x->lock);
1592 
1593         return err;
1594 }
1595 EXPORT_SYMBOL(xfrm_alloc_spi);
1596 
1597 static bool __xfrm_state_filter_match(struct xfrm_state *x,
1598                                       struct xfrm_address_filter *filter)
1599 {
1600         if (filter) {
1601                 if ((filter->family == AF_INET ||
1602                      filter->family == AF_INET6) &&
1603                     x->props.family != filter->family)
1604                         return false;
1605 
1606                 return addr_match(&x->props.saddr, &filter->saddr,
1607                                   filter->splen) &&
1608                        addr_match(&x->id.daddr, &filter->daddr,
1609                                   filter->dplen);
1610         }
1611         return true;
1612 }
1613 
1614 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1615                     int (*func)(struct xfrm_state *, int, void*),
1616                     void *data)
1617 {
1618         struct xfrm_state *state;
1619         struct xfrm_state_walk *x;
1620         int err = 0;
1621 
1622         if (walk->seq != 0 && list_empty(&walk->all))
1623                 return 0;
1624 
1625         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1626         if (list_empty(&walk->all))
1627                 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1628         else
1629                 x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
1630         list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1631                 if (x->state == XFRM_STATE_DEAD)
1632                         continue;
1633                 state = container_of(x, struct xfrm_state, km);
1634                 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1635                         continue;
1636                 if (!__xfrm_state_filter_match(state, walk->filter))
1637                         continue;
1638                 err = func(state, walk->seq, data);
1639                 if (err) {
1640                         list_move_tail(&walk->all, &x->all);
1641                         goto out;
1642                 }
1643                 walk->seq++;
1644         }
1645         if (walk->seq == 0) {
1646                 err = -ENOENT;
1647                 goto out;
1648         }
1649         list_del_init(&walk->all);
1650 out:
1651         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1652         return err;
1653 }
1654 EXPORT_SYMBOL(xfrm_state_walk);
1655 
1656 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1657                           struct xfrm_address_filter *filter)
1658 {
1659         INIT_LIST_HEAD(&walk->all);
1660         walk->proto = proto;
1661         walk->state = XFRM_STATE_DEAD;
1662         walk->seq = 0;
1663         walk->filter = filter;
1664 }
1665 EXPORT_SYMBOL(xfrm_state_walk_init);
1666 
1667 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
1668 {
1669         kfree(walk->filter);
1670 
1671         if (list_empty(&walk->all))
1672                 return;
1673 
1674         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1675         list_del(&walk->all);
1676         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1677 }
1678 EXPORT_SYMBOL(xfrm_state_walk_done);
1679 
1680 static void xfrm_replay_timer_handler(unsigned long data)
1681 {
1682         struct xfrm_state *x = (struct xfrm_state *)data;
1683 
1684         spin_lock(&x->lock);
1685 
1686         if (x->km.state == XFRM_STATE_VALID) {
1687                 if (xfrm_aevent_is_on(xs_net(x)))
1688                         x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
1689                 else
1690                         x->xflags |= XFRM_TIME_DEFER;
1691         }
1692 
1693         spin_unlock(&x->lock);
1694 }
1695 
1696 static LIST_HEAD(xfrm_km_list);
1697 
1698 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1699 {
1700         struct xfrm_mgr *km;
1701 
1702         rcu_read_lock();
1703         list_for_each_entry_rcu(km, &xfrm_km_list, list)
1704                 if (km->notify_policy)
1705                         km->notify_policy(xp, dir, c);
1706         rcu_read_unlock();
1707 }
1708 
1709 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
1710 {
1711         struct xfrm_mgr *km;
1712         rcu_read_lock();
1713         list_for_each_entry_rcu(km, &xfrm_km_list, list)
1714                 if (km->notify)
1715                         km->notify(x, c);
1716         rcu_read_unlock();
1717 }
1718 
1719 EXPORT_SYMBOL(km_policy_notify);
1720 EXPORT_SYMBOL(km_state_notify);
1721 
1722 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
1723 {
1724         struct km_event c;
1725 
1726         c.data.hard = hard;
1727         c.portid = portid;
1728         c.event = XFRM_MSG_EXPIRE;
1729         km_state_notify(x, &c);
1730 }
1731 
1732 EXPORT_SYMBOL(km_state_expired);
1733 /*
1734  * We send to all registered managers regardless of failure
1735  * We are happy with one success
1736 */
1737 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1738 {
1739         int err = -EINVAL, acqret;
1740         struct xfrm_mgr *km;
1741 
1742         rcu_read_lock();
1743         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1744                 acqret = km->acquire(x, t, pol);
1745                 if (!acqret)
1746                         err = acqret;
1747         }
1748         rcu_read_unlock();
1749         return err;
1750 }
1751 EXPORT_SYMBOL(km_query);
1752 
1753 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1754 {
1755         int err = -EINVAL;
1756         struct xfrm_mgr *km;
1757 
1758         rcu_read_lock();
1759         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1760                 if (km->new_mapping)
1761                         err = km->new_mapping(x, ipaddr, sport);
1762                 if (!err)
1763                         break;
1764         }
1765         rcu_read_unlock();
1766         return err;
1767 }
1768 EXPORT_SYMBOL(km_new_mapping);
1769 
1770 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
1771 {
1772         struct km_event c;
1773 
1774         c.data.hard = hard;
1775         c.portid = portid;
1776         c.event = XFRM_MSG_POLEXPIRE;
1777         km_policy_notify(pol, dir, &c);
1778 }
1779 EXPORT_SYMBOL(km_policy_expired);
1780 
1781 #ifdef CONFIG_XFRM_MIGRATE
1782 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1783                const struct xfrm_migrate *m, int num_migrate,
1784                const struct xfrm_kmaddress *k)
1785 {
1786         int err = -EINVAL;
1787         int ret;
1788         struct xfrm_mgr *km;
1789 
1790         rcu_read_lock();
1791         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1792                 if (km->migrate) {
1793                         ret = km->migrate(sel, dir, type, m, num_migrate, k);
1794                         if (!ret)
1795                                 err = ret;
1796                 }
1797         }
1798         rcu_read_unlock();
1799         return err;
1800 }
1801 EXPORT_SYMBOL(km_migrate);
1802 #endif
1803 
1804 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1805 {
1806         int err = -EINVAL;
1807         int ret;
1808         struct xfrm_mgr *km;
1809 
1810         rcu_read_lock();
1811         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1812                 if (km->report) {
1813                         ret = km->report(net, proto, sel, addr);
1814                         if (!ret)
1815                                 err = ret;
1816                 }
1817         }
1818         rcu_read_unlock();
1819         return err;
1820 }
1821 EXPORT_SYMBOL(km_report);
1822 
1823 bool km_is_alive(const struct km_event *c)
1824 {
1825         struct xfrm_mgr *km;
1826         bool is_alive = false;
1827 
1828         rcu_read_lock();
1829         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1830                 if (km->is_alive && km->is_alive(c)) {
1831                         is_alive = true;
1832                         break;
1833                 }
1834         }
1835         rcu_read_unlock();
1836 
1837         return is_alive;
1838 }
1839 EXPORT_SYMBOL(km_is_alive);
1840 
1841 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1842 {
1843         int err;
1844         u8 *data;
1845         struct xfrm_mgr *km;
1846         struct xfrm_policy *pol = NULL;
1847 
1848         if (optlen <= 0 || optlen > PAGE_SIZE)
1849                 return -EMSGSIZE;
1850 
1851         data = kmalloc(optlen, GFP_KERNEL);
1852         if (!data)
1853                 return -ENOMEM;
1854 
1855         err = -EFAULT;
1856         if (copy_from_user(data, optval, optlen))
1857                 goto out;
1858 
1859         err = -EINVAL;
1860         rcu_read_lock();
1861         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1862                 pol = km->compile_policy(sk, optname, data,
1863                                          optlen, &err);
1864                 if (err >= 0)
1865                         break;
1866         }
1867         rcu_read_unlock();
1868 
1869         if (err >= 0) {
1870                 xfrm_sk_policy_insert(sk, err, pol);
1871                 xfrm_pol_put(pol);
1872                 err = 0;
1873         }
1874 
1875 out:
1876         kfree(data);
1877         return err;
1878 }
1879 EXPORT_SYMBOL(xfrm_user_policy);
1880 
1881 static DEFINE_SPINLOCK(xfrm_km_lock);
1882 
1883 int xfrm_register_km(struct xfrm_mgr *km)
1884 {
1885         spin_lock_bh(&xfrm_km_lock);
1886         list_add_tail_rcu(&km->list, &xfrm_km_list);
1887         spin_unlock_bh(&xfrm_km_lock);
1888         return 0;
1889 }
1890 EXPORT_SYMBOL(xfrm_register_km);
1891 
1892 int xfrm_unregister_km(struct xfrm_mgr *km)
1893 {
1894         spin_lock_bh(&xfrm_km_lock);
1895         list_del_rcu(&km->list);
1896         spin_unlock_bh(&xfrm_km_lock);
1897         synchronize_rcu();
1898         return 0;
1899 }
1900 EXPORT_SYMBOL(xfrm_unregister_km);
1901 
1902 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1903 {
1904         int err = 0;
1905         if (unlikely(afinfo == NULL))
1906                 return -EINVAL;
1907         if (unlikely(afinfo->family >= NPROTO))
1908                 return -EAFNOSUPPORT;
1909         spin_lock_bh(&xfrm_state_afinfo_lock);
1910         if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1911                 err = -EEXIST;
1912         else
1913                 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
1914         spin_unlock_bh(&xfrm_state_afinfo_lock);
1915         return err;
1916 }
1917 EXPORT_SYMBOL(xfrm_state_register_afinfo);
1918 
1919 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1920 {
1921         int err = 0;
1922         if (unlikely(afinfo == NULL))
1923                 return -EINVAL;
1924         if (unlikely(afinfo->family >= NPROTO))
1925                 return -EAFNOSUPPORT;
1926         spin_lock_bh(&xfrm_state_afinfo_lock);
1927         if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1928                 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1929                         err = -EINVAL;
1930                 else
1931                         RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
1932         }
1933         spin_unlock_bh(&xfrm_state_afinfo_lock);
1934         synchronize_rcu();
1935         return err;
1936 }
1937 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1938 
1939 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1940 {
1941         struct xfrm_state_afinfo *afinfo;
1942         if (unlikely(family >= NPROTO))
1943                 return NULL;
1944         rcu_read_lock();
1945         afinfo = rcu_dereference(xfrm_state_afinfo[family]);
1946         if (unlikely(!afinfo))
1947                 rcu_read_unlock();
1948         return afinfo;
1949 }
1950 
1951 void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
1952 {
1953         rcu_read_unlock();
1954 }
1955 
1956 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
1957 void xfrm_state_delete_tunnel(struct xfrm_state *x)
1958 {
1959         if (x->tunnel) {
1960                 struct xfrm_state *t = x->tunnel;
1961 
1962                 if (atomic_read(&t->tunnel_users) == 2)
1963                         xfrm_state_delete(t);
1964                 atomic_dec(&t->tunnel_users);
1965                 xfrm_state_put(t);
1966                 x->tunnel = NULL;
1967         }
1968 }
1969 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
1970 
1971 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
1972 {
1973         int res;
1974 
1975         spin_lock_bh(&x->lock);
1976         if (x->km.state == XFRM_STATE_VALID &&
1977             x->type && x->type->get_mtu)
1978                 res = x->type->get_mtu(x, mtu);
1979         else
1980                 res = mtu - x->props.header_len;
1981         spin_unlock_bh(&x->lock);
1982         return res;
1983 }
1984 
1985 int __xfrm_init_state(struct xfrm_state *x, bool init_replay)
1986 {
1987         struct xfrm_state_afinfo *afinfo;
1988         struct xfrm_mode *inner_mode;
1989         int family = x->props.family;
1990         int err;
1991 
1992         err = -EAFNOSUPPORT;
1993         afinfo = xfrm_state_get_afinfo(family);
1994         if (!afinfo)
1995                 goto error;
1996 
1997         err = 0;
1998         if (afinfo->init_flags)
1999                 err = afinfo->init_flags(x);
2000 
2001         xfrm_state_put_afinfo(afinfo);
2002 
2003         if (err)
2004                 goto error;
2005 
2006         err = -EPROTONOSUPPORT;
2007 
2008         if (x->sel.family != AF_UNSPEC) {
2009                 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2010                 if (inner_mode == NULL)
2011                         goto error;
2012 
2013                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2014                     family != x->sel.family) {
2015                         xfrm_put_mode(inner_mode);
2016                         goto error;
2017                 }
2018 
2019                 x->inner_mode = inner_mode;
2020         } else {
2021                 struct xfrm_mode *inner_mode_iaf;
2022                 int iafamily = AF_INET;
2023 
2024                 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2025                 if (inner_mode == NULL)
2026                         goto error;
2027 
2028                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
2029                         xfrm_put_mode(inner_mode);
2030                         goto error;
2031                 }
2032                 x->inner_mode = inner_mode;
2033 
2034                 if (x->props.family == AF_INET)
2035                         iafamily = AF_INET6;
2036 
2037                 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2038                 if (inner_mode_iaf) {
2039                         if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2040                                 x->inner_mode_iaf = inner_mode_iaf;
2041                         else
2042                                 xfrm_put_mode(inner_mode_iaf);
2043                 }
2044         }
2045 
2046         x->type = xfrm_get_type(x->id.proto, family);
2047         if (x->type == NULL)
2048                 goto error;
2049 
2050         err = x->type->init_state(x);
2051         if (err)
2052                 goto error;
2053 
2054         x->outer_mode = xfrm_get_mode(x->props.mode, family);
2055         if (x->outer_mode == NULL) {
2056                 err = -EPROTONOSUPPORT;
2057                 goto error;
2058         }
2059 
2060         if (init_replay) {
2061                 err = xfrm_init_replay(x);
2062                 if (err)
2063                         goto error;
2064         }
2065 
2066         x->km.state = XFRM_STATE_VALID;
2067 
2068 error:
2069         return err;
2070 }
2071 
2072 EXPORT_SYMBOL(__xfrm_init_state);
2073 
2074 int xfrm_init_state(struct xfrm_state *x)
2075 {
2076         return __xfrm_init_state(x, true);
2077 }
2078 
2079 EXPORT_SYMBOL(xfrm_init_state);
2080 
2081 int __net_init xfrm_state_init(struct net *net)
2082 {
2083         unsigned int sz;
2084 
2085         INIT_LIST_HEAD(&net->xfrm.state_all);
2086 
2087         sz = sizeof(struct hlist_head) * 8;
2088 
2089         net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2090         if (!net->xfrm.state_bydst)
2091                 goto out_bydst;
2092         net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2093         if (!net->xfrm.state_bysrc)
2094                 goto out_bysrc;
2095         net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2096         if (!net->xfrm.state_byspi)
2097                 goto out_byspi;
2098         net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2099 
2100         net->xfrm.state_num = 0;
2101         INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2102         INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
2103         INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
2104         spin_lock_init(&net->xfrm.xfrm_state_lock);
2105         return 0;
2106 
2107 out_byspi:
2108         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2109 out_bysrc:
2110         xfrm_hash_free(net->xfrm.state_bydst, sz);
2111 out_bydst:
2112         return -ENOMEM;
2113 }
2114 
2115 void xfrm_state_fini(struct net *net)
2116 {
2117         unsigned int sz;
2118 
2119         flush_work(&net->xfrm.state_hash_work);
2120         xfrm_state_flush(net, IPSEC_PROTO_ANY, false);
2121         flush_work(&net->xfrm.state_gc_work);
2122 
2123         WARN_ON(!list_empty(&net->xfrm.state_all));
2124 
2125         sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2126         WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2127         xfrm_hash_free(net->xfrm.state_byspi, sz);
2128         WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2129         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2130         WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2131         xfrm_hash_free(net->xfrm.state_bydst, sz);
2132 }
2133 
2134 #ifdef CONFIG_AUDITSYSCALL
2135 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2136                                      struct audit_buffer *audit_buf)
2137 {
2138         struct xfrm_sec_ctx *ctx = x->security;
2139         u32 spi = ntohl(x->id.spi);
2140 
2141         if (ctx)
2142                 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2143                                  ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2144 
2145         switch (x->props.family) {
2146         case AF_INET:
2147                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2148                                  &x->props.saddr.a4, &x->id.daddr.a4);
2149                 break;
2150         case AF_INET6:
2151                 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2152                                  x->props.saddr.a6, x->id.daddr.a6);
2153                 break;
2154         }
2155 
2156         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2157 }
2158 
2159 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2160                                       struct audit_buffer *audit_buf)
2161 {
2162         const struct iphdr *iph4;
2163         const struct ipv6hdr *iph6;
2164 
2165         switch (family) {
2166         case AF_INET:
2167                 iph4 = ip_hdr(skb);
2168                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2169                                  &iph4->saddr, &iph4->daddr);
2170                 break;
2171         case AF_INET6:
2172                 iph6 = ipv6_hdr(skb);
2173                 audit_log_format(audit_buf,
2174                                  " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2175                                  &iph6->saddr, &iph6->daddr,
2176                                  iph6->flow_lbl[0] & 0x0f,
2177                                  iph6->flow_lbl[1],
2178                                  iph6->flow_lbl[2]);
2179                 break;
2180         }
2181 }
2182 
2183 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
2184 {
2185         struct audit_buffer *audit_buf;
2186 
2187         audit_buf = xfrm_audit_start("SAD-add");
2188         if (audit_buf == NULL)
2189                 return;
2190         xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2191         xfrm_audit_helper_sainfo(x, audit_buf);
2192         audit_log_format(audit_buf, " res=%u", result);
2193         audit_log_end(audit_buf);
2194 }
2195 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2196 
2197 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
2198 {
2199         struct audit_buffer *audit_buf;
2200 
2201         audit_buf = xfrm_audit_start("SAD-delete");
2202         if (audit_buf == NULL)
2203                 return;
2204         xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2205         xfrm_audit_helper_sainfo(x, audit_buf);
2206         audit_log_format(audit_buf, " res=%u", result);
2207         audit_log_end(audit_buf);
2208 }
2209 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2210 
2211 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2212                                       struct sk_buff *skb)
2213 {
2214         struct audit_buffer *audit_buf;
2215         u32 spi;
2216 
2217         audit_buf = xfrm_audit_start("SA-replay-overflow");
2218         if (audit_buf == NULL)
2219                 return;
2220         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2221         /* don't record the sequence number because it's inherent in this kind
2222          * of audit message */
2223         spi = ntohl(x->id.spi);
2224         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2225         audit_log_end(audit_buf);
2226 }
2227 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2228 
2229 void xfrm_audit_state_replay(struct xfrm_state *x,
2230                              struct sk_buff *skb, __be32 net_seq)
2231 {
2232         struct audit_buffer *audit_buf;
2233         u32 spi;
2234 
2235         audit_buf = xfrm_audit_start("SA-replayed-pkt");
2236         if (audit_buf == NULL)
2237                 return;
2238         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2239         spi = ntohl(x->id.spi);
2240         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2241                          spi, spi, ntohl(net_seq));
2242         audit_log_end(audit_buf);
2243 }
2244 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2245 
2246 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2247 {
2248         struct audit_buffer *audit_buf;
2249 
2250         audit_buf = xfrm_audit_start("SA-notfound");
2251         if (audit_buf == NULL)
2252                 return;
2253         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2254         audit_log_end(audit_buf);
2255 }
2256 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2257 
2258 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2259                                __be32 net_spi, __be32 net_seq)
2260 {
2261         struct audit_buffer *audit_buf;
2262         u32 spi;
2263 
2264         audit_buf = xfrm_audit_start("SA-notfound");
2265         if (audit_buf == NULL)
2266                 return;
2267         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2268         spi = ntohl(net_spi);
2269         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2270                          spi, spi, ntohl(net_seq));
2271         audit_log_end(audit_buf);
2272 }
2273 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2274 
2275 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2276                               struct sk_buff *skb, u8 proto)
2277 {
2278         struct audit_buffer *audit_buf;
2279         __be32 net_spi;
2280         __be32 net_seq;
2281 
2282         audit_buf = xfrm_audit_start("SA-icv-failure");
2283         if (audit_buf == NULL)
2284                 return;
2285         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2286         if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2287                 u32 spi = ntohl(net_spi);
2288                 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2289                                  spi, spi, ntohl(net_seq));
2290         }
2291         audit_log_end(audit_buf);
2292 }
2293 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2294 #endif /* CONFIG_AUDITSYSCALL */
2295 

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