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

Version: ~ [ linux-5.3 ] ~ [ linux-5.2.14 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.72 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.143 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.192 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.192 ] ~ [ 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-3.16.73 ] ~ [ 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 <linux/uaccess.h>
 24 #include <linux/ktime.h>
 25 #include <linux/slab.h>
 26 #include <linux/interrupt.h>
 27 #include <linux/kernel.h>
 28 
 29 #include "xfrm_hash.h"
 30 
 31 #define xfrm_state_deref_prot(table, net) \
 32         rcu_dereference_protected((table), lockdep_is_held(&(net)->xfrm.xfrm_state_lock))
 33 
 34 static void xfrm_state_gc_task(struct work_struct *work);
 35 
 36 /* Each xfrm_state may be linked to two tables:
 37 
 38    1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
 39    2. Hash table by (daddr,family,reqid) to find what SAs exist for given
 40       destination/tunnel endpoint. (output)
 41  */
 42 
 43 static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
 44 static __read_mostly seqcount_t xfrm_state_hash_generation = SEQCNT_ZERO(xfrm_state_hash_generation);
 45 
 46 static DECLARE_WORK(xfrm_state_gc_work, xfrm_state_gc_task);
 47 static HLIST_HEAD(xfrm_state_gc_list);
 48 
 49 static inline bool xfrm_state_hold_rcu(struct xfrm_state __rcu *x)
 50 {
 51         return atomic_inc_not_zero(&x->refcnt);
 52 }
 53 
 54 static inline unsigned int xfrm_dst_hash(struct net *net,
 55                                          const xfrm_address_t *daddr,
 56                                          const xfrm_address_t *saddr,
 57                                          u32 reqid,
 58                                          unsigned short family)
 59 {
 60         return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
 61 }
 62 
 63 static inline unsigned int xfrm_src_hash(struct net *net,
 64                                          const xfrm_address_t *daddr,
 65                                          const xfrm_address_t *saddr,
 66                                          unsigned short family)
 67 {
 68         return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
 69 }
 70 
 71 static inline unsigned int
 72 xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr,
 73               __be32 spi, u8 proto, unsigned short family)
 74 {
 75         return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
 76 }
 77 
 78 static void xfrm_hash_transfer(struct hlist_head *list,
 79                                struct hlist_head *ndsttable,
 80                                struct hlist_head *nsrctable,
 81                                struct hlist_head *nspitable,
 82                                unsigned int nhashmask)
 83 {
 84         struct hlist_node *tmp;
 85         struct xfrm_state *x;
 86 
 87         hlist_for_each_entry_safe(x, tmp, list, bydst) {
 88                 unsigned int h;
 89 
 90                 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
 91                                     x->props.reqid, x->props.family,
 92                                     nhashmask);
 93                 hlist_add_head_rcu(&x->bydst, ndsttable + h);
 94 
 95                 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
 96                                     x->props.family,
 97                                     nhashmask);
 98                 hlist_add_head_rcu(&x->bysrc, nsrctable + h);
 99 
100                 if (x->id.spi) {
101                         h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
102                                             x->id.proto, x->props.family,
103                                             nhashmask);
104                         hlist_add_head_rcu(&x->byspi, nspitable + h);
105                 }
106         }
107 }
108 
109 static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
110 {
111         return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
112 }
113 
114 static void xfrm_hash_resize(struct work_struct *work)
115 {
116         struct net *net = container_of(work, struct net, xfrm.state_hash_work);
117         struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
118         unsigned long nsize, osize;
119         unsigned int nhashmask, ohashmask;
120         int i;
121 
122         nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
123         ndst = xfrm_hash_alloc(nsize);
124         if (!ndst)
125                 return;
126         nsrc = xfrm_hash_alloc(nsize);
127         if (!nsrc) {
128                 xfrm_hash_free(ndst, nsize);
129                 return;
130         }
131         nspi = xfrm_hash_alloc(nsize);
132         if (!nspi) {
133                 xfrm_hash_free(ndst, nsize);
134                 xfrm_hash_free(nsrc, nsize);
135                 return;
136         }
137 
138         spin_lock_bh(&net->xfrm.xfrm_state_lock);
139         write_seqcount_begin(&xfrm_state_hash_generation);
140 
141         nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
142         odst = xfrm_state_deref_prot(net->xfrm.state_bydst, net);
143         for (i = net->xfrm.state_hmask; i >= 0; i--)
144                 xfrm_hash_transfer(odst + i, ndst, nsrc, nspi, nhashmask);
145 
146         osrc = xfrm_state_deref_prot(net->xfrm.state_bysrc, net);
147         ospi = xfrm_state_deref_prot(net->xfrm.state_byspi, net);
148         ohashmask = net->xfrm.state_hmask;
149 
150         rcu_assign_pointer(net->xfrm.state_bydst, ndst);
151         rcu_assign_pointer(net->xfrm.state_bysrc, nsrc);
152         rcu_assign_pointer(net->xfrm.state_byspi, nspi);
153         net->xfrm.state_hmask = nhashmask;
154 
155         write_seqcount_end(&xfrm_state_hash_generation);
156         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
157 
158         osize = (ohashmask + 1) * sizeof(struct hlist_head);
159 
160         synchronize_rcu();
161 
162         xfrm_hash_free(odst, osize);
163         xfrm_hash_free(osrc, osize);
164         xfrm_hash_free(ospi, osize);
165 }
166 
167 static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
168 static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO];
169 
170 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
171 
172 int __xfrm_state_delete(struct xfrm_state *x);
173 
174 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
175 bool km_is_alive(const struct km_event *c);
176 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
177 
178 static DEFINE_SPINLOCK(xfrm_type_lock);
179 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
180 {
181         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
182         const struct xfrm_type **typemap;
183         int err = 0;
184 
185         if (unlikely(afinfo == NULL))
186                 return -EAFNOSUPPORT;
187         typemap = afinfo->type_map;
188         spin_lock_bh(&xfrm_type_lock);
189 
190         if (likely(typemap[type->proto] == NULL))
191                 typemap[type->proto] = type;
192         else
193                 err = -EEXIST;
194         spin_unlock_bh(&xfrm_type_lock);
195         xfrm_state_put_afinfo(afinfo);
196         return err;
197 }
198 EXPORT_SYMBOL(xfrm_register_type);
199 
200 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
201 {
202         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
203         const struct xfrm_type **typemap;
204         int err = 0;
205 
206         if (unlikely(afinfo == NULL))
207                 return -EAFNOSUPPORT;
208         typemap = afinfo->type_map;
209         spin_lock_bh(&xfrm_type_lock);
210 
211         if (unlikely(typemap[type->proto] != type))
212                 err = -ENOENT;
213         else
214                 typemap[type->proto] = NULL;
215         spin_unlock_bh(&xfrm_type_lock);
216         xfrm_state_put_afinfo(afinfo);
217         return err;
218 }
219 EXPORT_SYMBOL(xfrm_unregister_type);
220 
221 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
222 {
223         struct xfrm_state_afinfo *afinfo;
224         const struct xfrm_type **typemap;
225         const struct xfrm_type *type;
226         int modload_attempted = 0;
227 
228 retry:
229         afinfo = xfrm_state_get_afinfo(family);
230         if (unlikely(afinfo == NULL))
231                 return NULL;
232         typemap = afinfo->type_map;
233 
234         type = typemap[proto];
235         if (unlikely(type && !try_module_get(type->owner)))
236                 type = NULL;
237         if (!type && !modload_attempted) {
238                 xfrm_state_put_afinfo(afinfo);
239                 request_module("xfrm-type-%d-%d", family, proto);
240                 modload_attempted = 1;
241                 goto retry;
242         }
243 
244         xfrm_state_put_afinfo(afinfo);
245         return type;
246 }
247 
248 static void xfrm_put_type(const struct xfrm_type *type)
249 {
250         module_put(type->owner);
251 }
252 
253 static DEFINE_SPINLOCK(xfrm_mode_lock);
254 int xfrm_register_mode(struct xfrm_mode *mode, int family)
255 {
256         struct xfrm_state_afinfo *afinfo;
257         struct xfrm_mode **modemap;
258         int err;
259 
260         if (unlikely(mode->encap >= XFRM_MODE_MAX))
261                 return -EINVAL;
262 
263         afinfo = xfrm_state_get_afinfo(family);
264         if (unlikely(afinfo == NULL))
265                 return -EAFNOSUPPORT;
266 
267         err = -EEXIST;
268         modemap = afinfo->mode_map;
269         spin_lock_bh(&xfrm_mode_lock);
270         if (modemap[mode->encap])
271                 goto out;
272 
273         err = -ENOENT;
274         if (!try_module_get(afinfo->owner))
275                 goto out;
276 
277         mode->afinfo = afinfo;
278         modemap[mode->encap] = mode;
279         err = 0;
280 
281 out:
282         spin_unlock_bh(&xfrm_mode_lock);
283         xfrm_state_put_afinfo(afinfo);
284         return err;
285 }
286 EXPORT_SYMBOL(xfrm_register_mode);
287 
288 int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
289 {
290         struct xfrm_state_afinfo *afinfo;
291         struct xfrm_mode **modemap;
292         int err;
293 
294         if (unlikely(mode->encap >= XFRM_MODE_MAX))
295                 return -EINVAL;
296 
297         afinfo = xfrm_state_get_afinfo(family);
298         if (unlikely(afinfo == NULL))
299                 return -EAFNOSUPPORT;
300 
301         err = -ENOENT;
302         modemap = afinfo->mode_map;
303         spin_lock_bh(&xfrm_mode_lock);
304         if (likely(modemap[mode->encap] == mode)) {
305                 modemap[mode->encap] = NULL;
306                 module_put(mode->afinfo->owner);
307                 err = 0;
308         }
309 
310         spin_unlock_bh(&xfrm_mode_lock);
311         xfrm_state_put_afinfo(afinfo);
312         return err;
313 }
314 EXPORT_SYMBOL(xfrm_unregister_mode);
315 
316 static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
317 {
318         struct xfrm_state_afinfo *afinfo;
319         struct xfrm_mode *mode;
320         int modload_attempted = 0;
321 
322         if (unlikely(encap >= XFRM_MODE_MAX))
323                 return NULL;
324 
325 retry:
326         afinfo = xfrm_state_get_afinfo(family);
327         if (unlikely(afinfo == NULL))
328                 return NULL;
329 
330         mode = afinfo->mode_map[encap];
331         if (unlikely(mode && !try_module_get(mode->owner)))
332                 mode = NULL;
333         if (!mode && !modload_attempted) {
334                 xfrm_state_put_afinfo(afinfo);
335                 request_module("xfrm-mode-%d-%d", family, encap);
336                 modload_attempted = 1;
337                 goto retry;
338         }
339 
340         xfrm_state_put_afinfo(afinfo);
341         return mode;
342 }
343 
344 static void xfrm_put_mode(struct xfrm_mode *mode)
345 {
346         module_put(mode->owner);
347 }
348 
349 static void xfrm_state_gc_destroy(struct xfrm_state *x)
350 {
351         tasklet_hrtimer_cancel(&x->mtimer);
352         del_timer_sync(&x->rtimer);
353         kfree(x->aead);
354         kfree(x->aalg);
355         kfree(x->ealg);
356         kfree(x->calg);
357         kfree(x->encap);
358         kfree(x->coaddr);
359         kfree(x->replay_esn);
360         kfree(x->preplay_esn);
361         if (x->inner_mode)
362                 xfrm_put_mode(x->inner_mode);
363         if (x->inner_mode_iaf)
364                 xfrm_put_mode(x->inner_mode_iaf);
365         if (x->outer_mode)
366                 xfrm_put_mode(x->outer_mode);
367         if (x->type) {
368                 x->type->destructor(x);
369                 xfrm_put_type(x->type);
370         }
371         security_xfrm_state_free(x);
372         kfree(x);
373 }
374 
375 static void xfrm_state_gc_task(struct work_struct *work)
376 {
377         struct xfrm_state *x;
378         struct hlist_node *tmp;
379         struct hlist_head gc_list;
380 
381         spin_lock_bh(&xfrm_state_gc_lock);
382         hlist_move_list(&xfrm_state_gc_list, &gc_list);
383         spin_unlock_bh(&xfrm_state_gc_lock);
384 
385         synchronize_rcu();
386 
387         hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
388                 xfrm_state_gc_destroy(x);
389 }
390 
391 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
392 {
393         struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
394         struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
395         unsigned long now = get_seconds();
396         long next = LONG_MAX;
397         int warn = 0;
398         int err = 0;
399 
400         spin_lock(&x->lock);
401         if (x->km.state == XFRM_STATE_DEAD)
402                 goto out;
403         if (x->km.state == XFRM_STATE_EXPIRED)
404                 goto expired;
405         if (x->lft.hard_add_expires_seconds) {
406                 long tmo = x->lft.hard_add_expires_seconds +
407                         x->curlft.add_time - now;
408                 if (tmo <= 0) {
409                         if (x->xflags & XFRM_SOFT_EXPIRE) {
410                                 /* enter hard expire without soft expire first?!
411                                  * setting a new date could trigger this.
412                                  * workarbound: fix x->curflt.add_time by below:
413                                  */
414                                 x->curlft.add_time = now - x->saved_tmo - 1;
415                                 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
416                         } else
417                                 goto expired;
418                 }
419                 if (tmo < next)
420                         next = tmo;
421         }
422         if (x->lft.hard_use_expires_seconds) {
423                 long tmo = x->lft.hard_use_expires_seconds +
424                         (x->curlft.use_time ? : now) - now;
425                 if (tmo <= 0)
426                         goto expired;
427                 if (tmo < next)
428                         next = tmo;
429         }
430         if (x->km.dying)
431                 goto resched;
432         if (x->lft.soft_add_expires_seconds) {
433                 long tmo = x->lft.soft_add_expires_seconds +
434                         x->curlft.add_time - now;
435                 if (tmo <= 0) {
436                         warn = 1;
437                         x->xflags &= ~XFRM_SOFT_EXPIRE;
438                 } else if (tmo < next) {
439                         next = tmo;
440                         x->xflags |= XFRM_SOFT_EXPIRE;
441                         x->saved_tmo = tmo;
442                 }
443         }
444         if (x->lft.soft_use_expires_seconds) {
445                 long tmo = x->lft.soft_use_expires_seconds +
446                         (x->curlft.use_time ? : now) - now;
447                 if (tmo <= 0)
448                         warn = 1;
449                 else if (tmo < next)
450                         next = tmo;
451         }
452 
453         x->km.dying = warn;
454         if (warn)
455                 km_state_expired(x, 0, 0);
456 resched:
457         if (next != LONG_MAX) {
458                 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
459         }
460 
461         goto out;
462 
463 expired:
464         if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
465                 x->km.state = XFRM_STATE_EXPIRED;
466 
467         err = __xfrm_state_delete(x);
468         if (!err)
469                 km_state_expired(x, 1, 0);
470 
471         xfrm_audit_state_delete(x, err ? 0 : 1, true);
472 
473 out:
474         spin_unlock(&x->lock);
475         return HRTIMER_NORESTART;
476 }
477 
478 static void xfrm_replay_timer_handler(unsigned long data);
479 
480 struct xfrm_state *xfrm_state_alloc(struct net *net)
481 {
482         struct xfrm_state *x;
483 
484         x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
485 
486         if (x) {
487                 write_pnet(&x->xs_net, net);
488                 atomic_set(&x->refcnt, 1);
489                 atomic_set(&x->tunnel_users, 0);
490                 INIT_LIST_HEAD(&x->km.all);
491                 INIT_HLIST_NODE(&x->bydst);
492                 INIT_HLIST_NODE(&x->bysrc);
493                 INIT_HLIST_NODE(&x->byspi);
494                 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler,
495                                         CLOCK_BOOTTIME, HRTIMER_MODE_ABS);
496                 setup_timer(&x->rtimer, xfrm_replay_timer_handler,
497                                 (unsigned long)x);
498                 x->curlft.add_time = get_seconds();
499                 x->lft.soft_byte_limit = XFRM_INF;
500                 x->lft.soft_packet_limit = XFRM_INF;
501                 x->lft.hard_byte_limit = XFRM_INF;
502                 x->lft.hard_packet_limit = XFRM_INF;
503                 x->replay_maxage = 0;
504                 x->replay_maxdiff = 0;
505                 x->inner_mode = NULL;
506                 x->inner_mode_iaf = NULL;
507                 spin_lock_init(&x->lock);
508         }
509         return x;
510 }
511 EXPORT_SYMBOL(xfrm_state_alloc);
512 
513 void __xfrm_state_destroy(struct xfrm_state *x)
514 {
515         WARN_ON(x->km.state != XFRM_STATE_DEAD);
516 
517         spin_lock_bh(&xfrm_state_gc_lock);
518         hlist_add_head(&x->gclist, &xfrm_state_gc_list);
519         spin_unlock_bh(&xfrm_state_gc_lock);
520         schedule_work(&xfrm_state_gc_work);
521 }
522 EXPORT_SYMBOL(__xfrm_state_destroy);
523 
524 int __xfrm_state_delete(struct xfrm_state *x)
525 {
526         struct net *net = xs_net(x);
527         int err = -ESRCH;
528 
529         if (x->km.state != XFRM_STATE_DEAD) {
530                 x->km.state = XFRM_STATE_DEAD;
531                 spin_lock(&net->xfrm.xfrm_state_lock);
532                 list_del(&x->km.all);
533                 hlist_del_rcu(&x->bydst);
534                 hlist_del_rcu(&x->bysrc);
535                 if (x->id.spi)
536                         hlist_del_rcu(&x->byspi);
537                 net->xfrm.state_num--;
538                 spin_unlock(&net->xfrm.xfrm_state_lock);
539 
540                 /* All xfrm_state objects are created by xfrm_state_alloc.
541                  * The xfrm_state_alloc call gives a reference, and that
542                  * is what we are dropping here.
543                  */
544                 xfrm_state_put(x);
545                 err = 0;
546         }
547 
548         return err;
549 }
550 EXPORT_SYMBOL(__xfrm_state_delete);
551 
552 int xfrm_state_delete(struct xfrm_state *x)
553 {
554         int err;
555 
556         spin_lock_bh(&x->lock);
557         err = __xfrm_state_delete(x);
558         spin_unlock_bh(&x->lock);
559 
560         return err;
561 }
562 EXPORT_SYMBOL(xfrm_state_delete);
563 
564 #ifdef CONFIG_SECURITY_NETWORK_XFRM
565 static inline int
566 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
567 {
568         int i, err = 0;
569 
570         for (i = 0; i <= net->xfrm.state_hmask; i++) {
571                 struct xfrm_state *x;
572 
573                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
574                         if (xfrm_id_proto_match(x->id.proto, proto) &&
575                            (err = security_xfrm_state_delete(x)) != 0) {
576                                 xfrm_audit_state_delete(x, 0, task_valid);
577                                 return err;
578                         }
579                 }
580         }
581 
582         return err;
583 }
584 #else
585 static inline int
586 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
587 {
588         return 0;
589 }
590 #endif
591 
592 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid)
593 {
594         int i, err = 0, cnt = 0;
595 
596         spin_lock_bh(&net->xfrm.xfrm_state_lock);
597         err = xfrm_state_flush_secctx_check(net, proto, task_valid);
598         if (err)
599                 goto out;
600 
601         err = -ESRCH;
602         for (i = 0; i <= net->xfrm.state_hmask; i++) {
603                 struct xfrm_state *x;
604 restart:
605                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
606                         if (!xfrm_state_kern(x) &&
607                             xfrm_id_proto_match(x->id.proto, proto)) {
608                                 xfrm_state_hold(x);
609                                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
610 
611                                 err = xfrm_state_delete(x);
612                                 xfrm_audit_state_delete(x, err ? 0 : 1,
613                                                         task_valid);
614                                 xfrm_state_put(x);
615                                 if (!err)
616                                         cnt++;
617 
618                                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
619                                 goto restart;
620                         }
621                 }
622         }
623         if (cnt)
624                 err = 0;
625 
626 out:
627         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
628         return err;
629 }
630 EXPORT_SYMBOL(xfrm_state_flush);
631 
632 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
633 {
634         spin_lock_bh(&net->xfrm.xfrm_state_lock);
635         si->sadcnt = net->xfrm.state_num;
636         si->sadhcnt = net->xfrm.state_hmask;
637         si->sadhmcnt = xfrm_state_hashmax;
638         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
639 }
640 EXPORT_SYMBOL(xfrm_sad_getinfo);
641 
642 static int
643 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
644                     const struct xfrm_tmpl *tmpl,
645                     const xfrm_address_t *daddr, const xfrm_address_t *saddr,
646                     unsigned short family)
647 {
648         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
649         if (!afinfo)
650                 return -1;
651         afinfo->init_tempsel(&x->sel, fl);
652 
653         if (family != tmpl->encap_family) {
654                 xfrm_state_put_afinfo(afinfo);
655                 afinfo = xfrm_state_get_afinfo(tmpl->encap_family);
656                 if (!afinfo)
657                         return -1;
658         }
659         afinfo->init_temprop(x, tmpl, daddr, saddr);
660         xfrm_state_put_afinfo(afinfo);
661         return 0;
662 }
663 
664 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
665                                               const xfrm_address_t *daddr,
666                                               __be32 spi, u8 proto,
667                                               unsigned short family)
668 {
669         unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
670         struct xfrm_state *x;
671 
672         hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) {
673                 if (x->props.family != family ||
674                     x->id.spi       != spi ||
675                     x->id.proto     != proto ||
676                     !xfrm_addr_equal(&x->id.daddr, daddr, family))
677                         continue;
678 
679                 if ((mark & x->mark.m) != x->mark.v)
680                         continue;
681                 if (!xfrm_state_hold_rcu(x))
682                         continue;
683                 return x;
684         }
685 
686         return NULL;
687 }
688 
689 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
690                                                      const xfrm_address_t *daddr,
691                                                      const xfrm_address_t *saddr,
692                                                      u8 proto, unsigned short family)
693 {
694         unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
695         struct xfrm_state *x;
696 
697         hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) {
698                 if (x->props.family != family ||
699                     x->id.proto     != proto ||
700                     !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
701                     !xfrm_addr_equal(&x->props.saddr, saddr, family))
702                         continue;
703 
704                 if ((mark & x->mark.m) != x->mark.v)
705                         continue;
706                 if (!xfrm_state_hold_rcu(x))
707                         continue;
708                 return x;
709         }
710 
711         return NULL;
712 }
713 
714 static inline struct xfrm_state *
715 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
716 {
717         struct net *net = xs_net(x);
718         u32 mark = x->mark.v & x->mark.m;
719 
720         if (use_spi)
721                 return __xfrm_state_lookup(net, mark, &x->id.daddr,
722                                            x->id.spi, x->id.proto, family);
723         else
724                 return __xfrm_state_lookup_byaddr(net, mark,
725                                                   &x->id.daddr,
726                                                   &x->props.saddr,
727                                                   x->id.proto, family);
728 }
729 
730 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
731 {
732         if (have_hash_collision &&
733             (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
734             net->xfrm.state_num > net->xfrm.state_hmask)
735                 schedule_work(&net->xfrm.state_hash_work);
736 }
737 
738 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
739                                const struct flowi *fl, unsigned short family,
740                                struct xfrm_state **best, int *acq_in_progress,
741                                int *error)
742 {
743         /* Resolution logic:
744          * 1. There is a valid state with matching selector. Done.
745          * 2. Valid state with inappropriate selector. Skip.
746          *
747          * Entering area of "sysdeps".
748          *
749          * 3. If state is not valid, selector is temporary, it selects
750          *    only session which triggered previous resolution. Key
751          *    manager will do something to install a state with proper
752          *    selector.
753          */
754         if (x->km.state == XFRM_STATE_VALID) {
755                 if ((x->sel.family &&
756                      !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
757                     !security_xfrm_state_pol_flow_match(x, pol, fl))
758                         return;
759 
760                 if (!*best ||
761                     (*best)->km.dying > x->km.dying ||
762                     ((*best)->km.dying == x->km.dying &&
763                      (*best)->curlft.add_time < x->curlft.add_time))
764                         *best = x;
765         } else if (x->km.state == XFRM_STATE_ACQ) {
766                 *acq_in_progress = 1;
767         } else if (x->km.state == XFRM_STATE_ERROR ||
768                    x->km.state == XFRM_STATE_EXPIRED) {
769                 if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
770                     security_xfrm_state_pol_flow_match(x, pol, fl))
771                         *error = -ESRCH;
772         }
773 }
774 
775 struct xfrm_state *
776 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
777                 const struct flowi *fl, struct xfrm_tmpl *tmpl,
778                 struct xfrm_policy *pol, int *err,
779                 unsigned short family)
780 {
781         static xfrm_address_t saddr_wildcard = { };
782         struct net *net = xp_net(pol);
783         unsigned int h, h_wildcard;
784         struct xfrm_state *x, *x0, *to_put;
785         int acquire_in_progress = 0;
786         int error = 0;
787         struct xfrm_state *best = NULL;
788         u32 mark = pol->mark.v & pol->mark.m;
789         unsigned short encap_family = tmpl->encap_family;
790         unsigned int sequence;
791         struct km_event c;
792 
793         to_put = NULL;
794 
795         sequence = read_seqcount_begin(&xfrm_state_hash_generation);
796 
797         rcu_read_lock();
798         h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
799         hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) {
800                 if (x->props.family == encap_family &&
801                     x->props.reqid == tmpl->reqid &&
802                     (mark & x->mark.m) == x->mark.v &&
803                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
804                     xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
805                     tmpl->mode == x->props.mode &&
806                     tmpl->id.proto == x->id.proto &&
807                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
808                         xfrm_state_look_at(pol, x, fl, encap_family,
809                                            &best, &acquire_in_progress, &error);
810         }
811         if (best || acquire_in_progress)
812                 goto found;
813 
814         h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
815         hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h_wildcard, bydst) {
816                 if (x->props.family == encap_family &&
817                     x->props.reqid == tmpl->reqid &&
818                     (mark & x->mark.m) == x->mark.v &&
819                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
820                     xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
821                     tmpl->mode == x->props.mode &&
822                     tmpl->id.proto == x->id.proto &&
823                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
824                         xfrm_state_look_at(pol, x, fl, encap_family,
825                                            &best, &acquire_in_progress, &error);
826         }
827 
828 found:
829         x = best;
830         if (!x && !error && !acquire_in_progress) {
831                 if (tmpl->id.spi &&
832                     (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
833                                               tmpl->id.proto, encap_family)) != NULL) {
834                         to_put = x0;
835                         error = -EEXIST;
836                         goto out;
837                 }
838 
839                 c.net = net;
840                 /* If the KMs have no listeners (yet...), avoid allocating an SA
841                  * for each and every packet - garbage collection might not
842                  * handle the flood.
843                  */
844                 if (!km_is_alive(&c)) {
845                         error = -ESRCH;
846                         goto out;
847                 }
848 
849                 x = xfrm_state_alloc(net);
850                 if (x == NULL) {
851                         error = -ENOMEM;
852                         goto out;
853                 }
854                 /* Initialize temporary state matching only
855                  * to current session. */
856                 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
857                 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
858 
859                 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
860                 if (error) {
861                         x->km.state = XFRM_STATE_DEAD;
862                         to_put = x;
863                         x = NULL;
864                         goto out;
865                 }
866 
867                 if (km_query(x, tmpl, pol) == 0) {
868                         spin_lock_bh(&net->xfrm.xfrm_state_lock);
869                         x->km.state = XFRM_STATE_ACQ;
870                         list_add(&x->km.all, &net->xfrm.state_all);
871                         hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
872                         h = xfrm_src_hash(net, daddr, saddr, encap_family);
873                         hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
874                         if (x->id.spi) {
875                                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
876                                 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
877                         }
878                         x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
879                         tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
880                         net->xfrm.state_num++;
881                         xfrm_hash_grow_check(net, x->bydst.next != NULL);
882                         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
883                 } else {
884                         x->km.state = XFRM_STATE_DEAD;
885                         to_put = x;
886                         x = NULL;
887                         error = -ESRCH;
888                 }
889         }
890 out:
891         if (x) {
892                 if (!xfrm_state_hold_rcu(x)) {
893                         *err = -EAGAIN;
894                         x = NULL;
895                 }
896         } else {
897                 *err = acquire_in_progress ? -EAGAIN : error;
898         }
899         rcu_read_unlock();
900         if (to_put)
901                 xfrm_state_put(to_put);
902 
903         if (read_seqcount_retry(&xfrm_state_hash_generation, sequence)) {
904                 *err = -EAGAIN;
905                 if (x) {
906                         xfrm_state_put(x);
907                         x = NULL;
908                 }
909         }
910 
911         return x;
912 }
913 
914 struct xfrm_state *
915 xfrm_stateonly_find(struct net *net, u32 mark,
916                     xfrm_address_t *daddr, xfrm_address_t *saddr,
917                     unsigned short family, u8 mode, u8 proto, u32 reqid)
918 {
919         unsigned int h;
920         struct xfrm_state *rx = NULL, *x = NULL;
921 
922         spin_lock_bh(&net->xfrm.xfrm_state_lock);
923         h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
924         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
925                 if (x->props.family == family &&
926                     x->props.reqid == reqid &&
927                     (mark & x->mark.m) == x->mark.v &&
928                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
929                     xfrm_state_addr_check(x, daddr, saddr, family) &&
930                     mode == x->props.mode &&
931                     proto == x->id.proto &&
932                     x->km.state == XFRM_STATE_VALID) {
933                         rx = x;
934                         break;
935                 }
936         }
937 
938         if (rx)
939                 xfrm_state_hold(rx);
940         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
941 
942 
943         return rx;
944 }
945 EXPORT_SYMBOL(xfrm_stateonly_find);
946 
947 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
948                                               unsigned short family)
949 {
950         struct xfrm_state *x;
951         struct xfrm_state_walk *w;
952 
953         spin_lock_bh(&net->xfrm.xfrm_state_lock);
954         list_for_each_entry(w, &net->xfrm.state_all, all) {
955                 x = container_of(w, struct xfrm_state, km);
956                 if (x->props.family != family ||
957                         x->id.spi != spi)
958                         continue;
959 
960                 xfrm_state_hold(x);
961                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
962                 return x;
963         }
964         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
965         return NULL;
966 }
967 EXPORT_SYMBOL(xfrm_state_lookup_byspi);
968 
969 static void __xfrm_state_insert(struct xfrm_state *x)
970 {
971         struct net *net = xs_net(x);
972         unsigned int h;
973 
974         list_add(&x->km.all, &net->xfrm.state_all);
975 
976         h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
977                           x->props.reqid, x->props.family);
978         hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
979 
980         h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
981         hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
982 
983         if (x->id.spi) {
984                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
985                                   x->props.family);
986 
987                 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
988         }
989 
990         tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
991         if (x->replay_maxage)
992                 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
993 
994         net->xfrm.state_num++;
995 
996         xfrm_hash_grow_check(net, x->bydst.next != NULL);
997 }
998 
999 /* net->xfrm.xfrm_state_lock is held */
1000 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
1001 {
1002         struct net *net = xs_net(xnew);
1003         unsigned short family = xnew->props.family;
1004         u32 reqid = xnew->props.reqid;
1005         struct xfrm_state *x;
1006         unsigned int h;
1007         u32 mark = xnew->mark.v & xnew->mark.m;
1008 
1009         h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
1010         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1011                 if (x->props.family     == family &&
1012                     x->props.reqid      == reqid &&
1013                     (mark & x->mark.m) == x->mark.v &&
1014                     xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
1015                     xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
1016                         x->genid++;
1017         }
1018 }
1019 
1020 void xfrm_state_insert(struct xfrm_state *x)
1021 {
1022         struct net *net = xs_net(x);
1023 
1024         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1025         __xfrm_state_bump_genids(x);
1026         __xfrm_state_insert(x);
1027         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1028 }
1029 EXPORT_SYMBOL(xfrm_state_insert);
1030 
1031 /* net->xfrm.xfrm_state_lock is held */
1032 static struct xfrm_state *__find_acq_core(struct net *net,
1033                                           const struct xfrm_mark *m,
1034                                           unsigned short family, u8 mode,
1035                                           u32 reqid, u8 proto,
1036                                           const xfrm_address_t *daddr,
1037                                           const xfrm_address_t *saddr,
1038                                           int create)
1039 {
1040         unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1041         struct xfrm_state *x;
1042         u32 mark = m->v & m->m;
1043 
1044         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1045                 if (x->props.reqid  != reqid ||
1046                     x->props.mode   != mode ||
1047                     x->props.family != family ||
1048                     x->km.state     != XFRM_STATE_ACQ ||
1049                     x->id.spi       != 0 ||
1050                     x->id.proto     != proto ||
1051                     (mark & x->mark.m) != x->mark.v ||
1052                     !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1053                     !xfrm_addr_equal(&x->props.saddr, saddr, family))
1054                         continue;
1055 
1056                 xfrm_state_hold(x);
1057                 return x;
1058         }
1059 
1060         if (!create)
1061                 return NULL;
1062 
1063         x = xfrm_state_alloc(net);
1064         if (likely(x)) {
1065                 switch (family) {
1066                 case AF_INET:
1067                         x->sel.daddr.a4 = daddr->a4;
1068                         x->sel.saddr.a4 = saddr->a4;
1069                         x->sel.prefixlen_d = 32;
1070                         x->sel.prefixlen_s = 32;
1071                         x->props.saddr.a4 = saddr->a4;
1072                         x->id.daddr.a4 = daddr->a4;
1073                         break;
1074 
1075                 case AF_INET6:
1076                         x->sel.daddr.in6 = daddr->in6;
1077                         x->sel.saddr.in6 = saddr->in6;
1078                         x->sel.prefixlen_d = 128;
1079                         x->sel.prefixlen_s = 128;
1080                         x->props.saddr.in6 = saddr->in6;
1081                         x->id.daddr.in6 = daddr->in6;
1082                         break;
1083                 }
1084 
1085                 x->km.state = XFRM_STATE_ACQ;
1086                 x->id.proto = proto;
1087                 x->props.family = family;
1088                 x->props.mode = mode;
1089                 x->props.reqid = reqid;
1090                 x->mark.v = m->v;
1091                 x->mark.m = m->m;
1092                 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1093                 xfrm_state_hold(x);
1094                 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1095                 list_add(&x->km.all, &net->xfrm.state_all);
1096                 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1097                 h = xfrm_src_hash(net, daddr, saddr, family);
1098                 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1099 
1100                 net->xfrm.state_num++;
1101 
1102                 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1103         }
1104 
1105         return x;
1106 }
1107 
1108 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1109 
1110 int xfrm_state_add(struct xfrm_state *x)
1111 {
1112         struct net *net = xs_net(x);
1113         struct xfrm_state *x1, *to_put;
1114         int family;
1115         int err;
1116         u32 mark = x->mark.v & x->mark.m;
1117         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1118 
1119         family = x->props.family;
1120 
1121         to_put = NULL;
1122 
1123         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1124 
1125         x1 = __xfrm_state_locate(x, use_spi, family);
1126         if (x1) {
1127                 to_put = x1;
1128                 x1 = NULL;
1129                 err = -EEXIST;
1130                 goto out;
1131         }
1132 
1133         if (use_spi && x->km.seq) {
1134                 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1135                 if (x1 && ((x1->id.proto != x->id.proto) ||
1136                     !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1137                         to_put = x1;
1138                         x1 = NULL;
1139                 }
1140         }
1141 
1142         if (use_spi && !x1)
1143                 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1144                                      x->props.reqid, x->id.proto,
1145                                      &x->id.daddr, &x->props.saddr, 0);
1146 
1147         __xfrm_state_bump_genids(x);
1148         __xfrm_state_insert(x);
1149         err = 0;
1150 
1151 out:
1152         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1153 
1154         if (x1) {
1155                 xfrm_state_delete(x1);
1156                 xfrm_state_put(x1);
1157         }
1158 
1159         if (to_put)
1160                 xfrm_state_put(to_put);
1161 
1162         return err;
1163 }
1164 EXPORT_SYMBOL(xfrm_state_add);
1165 
1166 #ifdef CONFIG_XFRM_MIGRATE
1167 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig)
1168 {
1169         struct net *net = xs_net(orig);
1170         struct xfrm_state *x = xfrm_state_alloc(net);
1171         if (!x)
1172                 goto out;
1173 
1174         memcpy(&x->id, &orig->id, sizeof(x->id));
1175         memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1176         memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1177         x->props.mode = orig->props.mode;
1178         x->props.replay_window = orig->props.replay_window;
1179         x->props.reqid = orig->props.reqid;
1180         x->props.family = orig->props.family;
1181         x->props.saddr = orig->props.saddr;
1182 
1183         if (orig->aalg) {
1184                 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1185                 if (!x->aalg)
1186                         goto error;
1187         }
1188         x->props.aalgo = orig->props.aalgo;
1189 
1190         if (orig->aead) {
1191                 x->aead = xfrm_algo_aead_clone(orig->aead);
1192                 if (!x->aead)
1193                         goto error;
1194         }
1195         if (orig->ealg) {
1196                 x->ealg = xfrm_algo_clone(orig->ealg);
1197                 if (!x->ealg)
1198                         goto error;
1199         }
1200         x->props.ealgo = orig->props.ealgo;
1201 
1202         if (orig->calg) {
1203                 x->calg = xfrm_algo_clone(orig->calg);
1204                 if (!x->calg)
1205                         goto error;
1206         }
1207         x->props.calgo = orig->props.calgo;
1208 
1209         if (orig->encap) {
1210                 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
1211                 if (!x->encap)
1212                         goto error;
1213         }
1214 
1215         if (orig->coaddr) {
1216                 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1217                                     GFP_KERNEL);
1218                 if (!x->coaddr)
1219                         goto error;
1220         }
1221 
1222         if (orig->replay_esn) {
1223                 if (xfrm_replay_clone(x, orig))
1224                         goto error;
1225         }
1226 
1227         memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1228 
1229         if (xfrm_init_state(x) < 0)
1230                 goto error;
1231 
1232         x->props.flags = orig->props.flags;
1233         x->props.extra_flags = orig->props.extra_flags;
1234 
1235         x->tfcpad = orig->tfcpad;
1236         x->replay_maxdiff = orig->replay_maxdiff;
1237         x->replay_maxage = orig->replay_maxage;
1238         x->curlft.add_time = orig->curlft.add_time;
1239         x->km.state = orig->km.state;
1240         x->km.seq = orig->km.seq;
1241 
1242         return x;
1243 
1244  error:
1245         xfrm_state_put(x);
1246 out:
1247         return NULL;
1248 }
1249 
1250 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net)
1251 {
1252         unsigned int h;
1253         struct xfrm_state *x = NULL;
1254 
1255         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1256 
1257         if (m->reqid) {
1258                 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
1259                                   m->reqid, m->old_family);
1260                 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1261                         if (x->props.mode != m->mode ||
1262                             x->id.proto != m->proto)
1263                                 continue;
1264                         if (m->reqid && x->props.reqid != m->reqid)
1265                                 continue;
1266                         if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1267                                              m->old_family) ||
1268                             !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1269                                              m->old_family))
1270                                 continue;
1271                         xfrm_state_hold(x);
1272                         break;
1273                 }
1274         } else {
1275                 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1276                                   m->old_family);
1277                 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1278                         if (x->props.mode != m->mode ||
1279                             x->id.proto != m->proto)
1280                                 continue;
1281                         if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1282                                              m->old_family) ||
1283                             !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1284                                              m->old_family))
1285                                 continue;
1286                         xfrm_state_hold(x);
1287                         break;
1288                 }
1289         }
1290 
1291         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1292 
1293         return x;
1294 }
1295 EXPORT_SYMBOL(xfrm_migrate_state_find);
1296 
1297 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1298                                       struct xfrm_migrate *m)
1299 {
1300         struct xfrm_state *xc;
1301 
1302         xc = xfrm_state_clone(x);
1303         if (!xc)
1304                 return NULL;
1305 
1306         memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1307         memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1308 
1309         /* add state */
1310         if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1311                 /* a care is needed when the destination address of the
1312                    state is to be updated as it is a part of triplet */
1313                 xfrm_state_insert(xc);
1314         } else {
1315                 if (xfrm_state_add(xc) < 0)
1316                         goto error;
1317         }
1318 
1319         return xc;
1320 error:
1321         xfrm_state_put(xc);
1322         return NULL;
1323 }
1324 EXPORT_SYMBOL(xfrm_state_migrate);
1325 #endif
1326 
1327 int xfrm_state_update(struct xfrm_state *x)
1328 {
1329         struct xfrm_state *x1, *to_put;
1330         int err;
1331         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1332         struct net *net = xs_net(x);
1333 
1334         to_put = NULL;
1335 
1336         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1337         x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1338 
1339         err = -ESRCH;
1340         if (!x1)
1341                 goto out;
1342 
1343         if (xfrm_state_kern(x1)) {
1344                 to_put = x1;
1345                 err = -EEXIST;
1346                 goto out;
1347         }
1348 
1349         if (x1->km.state == XFRM_STATE_ACQ) {
1350                 __xfrm_state_insert(x);
1351                 x = NULL;
1352         }
1353         err = 0;
1354 
1355 out:
1356         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1357 
1358         if (to_put)
1359                 xfrm_state_put(to_put);
1360 
1361         if (err)
1362                 return err;
1363 
1364         if (!x) {
1365                 xfrm_state_delete(x1);
1366                 xfrm_state_put(x1);
1367                 return 0;
1368         }
1369 
1370         err = -EINVAL;
1371         spin_lock_bh(&x1->lock);
1372         if (likely(x1->km.state == XFRM_STATE_VALID)) {
1373                 if (x->encap && x1->encap)
1374                         memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1375                 if (x->coaddr && x1->coaddr) {
1376                         memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1377                 }
1378                 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1379                         memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1380                 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1381                 x1->km.dying = 0;
1382 
1383                 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1384                 if (x1->curlft.use_time)
1385                         xfrm_state_check_expire(x1);
1386 
1387                 err = 0;
1388                 x->km.state = XFRM_STATE_DEAD;
1389                 __xfrm_state_put(x);
1390         }
1391         spin_unlock_bh(&x1->lock);
1392 
1393         xfrm_state_put(x1);
1394 
1395         return err;
1396 }
1397 EXPORT_SYMBOL(xfrm_state_update);
1398 
1399 int xfrm_state_check_expire(struct xfrm_state *x)
1400 {
1401         if (!x->curlft.use_time)
1402                 x->curlft.use_time = get_seconds();
1403 
1404         if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1405             x->curlft.packets >= x->lft.hard_packet_limit) {
1406                 x->km.state = XFRM_STATE_EXPIRED;
1407                 tasklet_hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL);
1408                 return -EINVAL;
1409         }
1410 
1411         if (!x->km.dying &&
1412             (x->curlft.bytes >= x->lft.soft_byte_limit ||
1413              x->curlft.packets >= x->lft.soft_packet_limit)) {
1414                 x->km.dying = 1;
1415                 km_state_expired(x, 0, 0);
1416         }
1417         return 0;
1418 }
1419 EXPORT_SYMBOL(xfrm_state_check_expire);
1420 
1421 struct xfrm_state *
1422 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1423                   u8 proto, unsigned short family)
1424 {
1425         struct xfrm_state *x;
1426 
1427         rcu_read_lock();
1428         x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1429         rcu_read_unlock();
1430         return x;
1431 }
1432 EXPORT_SYMBOL(xfrm_state_lookup);
1433 
1434 struct xfrm_state *
1435 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1436                          const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1437                          u8 proto, unsigned short family)
1438 {
1439         struct xfrm_state *x;
1440 
1441         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1442         x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1443         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1444         return x;
1445 }
1446 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1447 
1448 struct xfrm_state *
1449 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1450               u8 proto, const xfrm_address_t *daddr,
1451               const xfrm_address_t *saddr, int create, unsigned short family)
1452 {
1453         struct xfrm_state *x;
1454 
1455         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1456         x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create);
1457         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1458 
1459         return x;
1460 }
1461 EXPORT_SYMBOL(xfrm_find_acq);
1462 
1463 #ifdef CONFIG_XFRM_SUB_POLICY
1464 int
1465 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1466                unsigned short family, struct net *net)
1467 {
1468         int err = 0;
1469         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1470         if (!afinfo)
1471                 return -EAFNOSUPPORT;
1472 
1473         spin_lock_bh(&net->xfrm.xfrm_state_lock); /*FIXME*/
1474         if (afinfo->tmpl_sort)
1475                 err = afinfo->tmpl_sort(dst, src, n);
1476         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1477         xfrm_state_put_afinfo(afinfo);
1478         return err;
1479 }
1480 EXPORT_SYMBOL(xfrm_tmpl_sort);
1481 
1482 int
1483 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1484                 unsigned short family)
1485 {
1486         int err = 0;
1487         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1488         struct net *net = xs_net(*src);
1489 
1490         if (!afinfo)
1491                 return -EAFNOSUPPORT;
1492 
1493         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1494         if (afinfo->state_sort)
1495                 err = afinfo->state_sort(dst, src, n);
1496         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1497         xfrm_state_put_afinfo(afinfo);
1498         return err;
1499 }
1500 EXPORT_SYMBOL(xfrm_state_sort);
1501 #endif
1502 
1503 /* Silly enough, but I'm lazy to build resolution list */
1504 
1505 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1506 {
1507         int i;
1508 
1509         for (i = 0; i <= net->xfrm.state_hmask; i++) {
1510                 struct xfrm_state *x;
1511 
1512                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
1513                         if (x->km.seq == seq &&
1514                             (mark & x->mark.m) == x->mark.v &&
1515                             x->km.state == XFRM_STATE_ACQ) {
1516                                 xfrm_state_hold(x);
1517                                 return x;
1518                         }
1519                 }
1520         }
1521         return NULL;
1522 }
1523 
1524 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1525 {
1526         struct xfrm_state *x;
1527 
1528         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1529         x = __xfrm_find_acq_byseq(net, mark, seq);
1530         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1531         return x;
1532 }
1533 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1534 
1535 u32 xfrm_get_acqseq(void)
1536 {
1537         u32 res;
1538         static atomic_t acqseq;
1539 
1540         do {
1541                 res = atomic_inc_return(&acqseq);
1542         } while (!res);
1543 
1544         return res;
1545 }
1546 EXPORT_SYMBOL(xfrm_get_acqseq);
1547 
1548 int verify_spi_info(u8 proto, u32 min, u32 max)
1549 {
1550         switch (proto) {
1551         case IPPROTO_AH:
1552         case IPPROTO_ESP:
1553                 break;
1554 
1555         case IPPROTO_COMP:
1556                 /* IPCOMP spi is 16-bits. */
1557                 if (max >= 0x10000)
1558                         return -EINVAL;
1559                 break;
1560 
1561         default:
1562                 return -EINVAL;
1563         }
1564 
1565         if (min > max)
1566                 return -EINVAL;
1567 
1568         return 0;
1569 }
1570 EXPORT_SYMBOL(verify_spi_info);
1571 
1572 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1573 {
1574         struct net *net = xs_net(x);
1575         unsigned int h;
1576         struct xfrm_state *x0;
1577         int err = -ENOENT;
1578         __be32 minspi = htonl(low);
1579         __be32 maxspi = htonl(high);
1580         u32 mark = x->mark.v & x->mark.m;
1581 
1582         spin_lock_bh(&x->lock);
1583         if (x->km.state == XFRM_STATE_DEAD)
1584                 goto unlock;
1585 
1586         err = 0;
1587         if (x->id.spi)
1588                 goto unlock;
1589 
1590         err = -ENOENT;
1591 
1592         if (minspi == maxspi) {
1593                 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1594                 if (x0) {
1595                         xfrm_state_put(x0);
1596                         goto unlock;
1597                 }
1598                 x->id.spi = minspi;
1599         } else {
1600                 u32 spi = 0;
1601                 for (h = 0; h < high-low+1; h++) {
1602                         spi = low + prandom_u32()%(high-low+1);
1603                         x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1604                         if (x0 == NULL) {
1605                                 x->id.spi = htonl(spi);
1606                                 break;
1607                         }
1608                         xfrm_state_put(x0);
1609                 }
1610         }
1611         if (x->id.spi) {
1612                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1613                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1614                 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1615                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1616 
1617                 err = 0;
1618         }
1619 
1620 unlock:
1621         spin_unlock_bh(&x->lock);
1622 
1623         return err;
1624 }
1625 EXPORT_SYMBOL(xfrm_alloc_spi);
1626 
1627 static bool __xfrm_state_filter_match(struct xfrm_state *x,
1628                                       struct xfrm_address_filter *filter)
1629 {
1630         if (filter) {
1631                 if ((filter->family == AF_INET ||
1632                      filter->family == AF_INET6) &&
1633                     x->props.family != filter->family)
1634                         return false;
1635 
1636                 return addr_match(&x->props.saddr, &filter->saddr,
1637                                   filter->splen) &&
1638                        addr_match(&x->id.daddr, &filter->daddr,
1639                                   filter->dplen);
1640         }
1641         return true;
1642 }
1643 
1644 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1645                     int (*func)(struct xfrm_state *, int, void*),
1646                     void *data)
1647 {
1648         struct xfrm_state *state;
1649         struct xfrm_state_walk *x;
1650         int err = 0;
1651 
1652         if (walk->seq != 0 && list_empty(&walk->all))
1653                 return 0;
1654 
1655         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1656         if (list_empty(&walk->all))
1657                 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1658         else
1659                 x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
1660         list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1661                 if (x->state == XFRM_STATE_DEAD)
1662                         continue;
1663                 state = container_of(x, struct xfrm_state, km);
1664                 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1665                         continue;
1666                 if (!__xfrm_state_filter_match(state, walk->filter))
1667                         continue;
1668                 err = func(state, walk->seq, data);
1669                 if (err) {
1670                         list_move_tail(&walk->all, &x->all);
1671                         goto out;
1672                 }
1673                 walk->seq++;
1674         }
1675         if (walk->seq == 0) {
1676                 err = -ENOENT;
1677                 goto out;
1678         }
1679         list_del_init(&walk->all);
1680 out:
1681         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1682         return err;
1683 }
1684 EXPORT_SYMBOL(xfrm_state_walk);
1685 
1686 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1687                           struct xfrm_address_filter *filter)
1688 {
1689         INIT_LIST_HEAD(&walk->all);
1690         walk->proto = proto;
1691         walk->state = XFRM_STATE_DEAD;
1692         walk->seq = 0;
1693         walk->filter = filter;
1694 }
1695 EXPORT_SYMBOL(xfrm_state_walk_init);
1696 
1697 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
1698 {
1699         kfree(walk->filter);
1700 
1701         if (list_empty(&walk->all))
1702                 return;
1703 
1704         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1705         list_del(&walk->all);
1706         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1707 }
1708 EXPORT_SYMBOL(xfrm_state_walk_done);
1709 
1710 static void xfrm_replay_timer_handler(unsigned long data)
1711 {
1712         struct xfrm_state *x = (struct xfrm_state *)data;
1713 
1714         spin_lock(&x->lock);
1715 
1716         if (x->km.state == XFRM_STATE_VALID) {
1717                 if (xfrm_aevent_is_on(xs_net(x)))
1718                         x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
1719                 else
1720                         x->xflags |= XFRM_TIME_DEFER;
1721         }
1722 
1723         spin_unlock(&x->lock);
1724 }
1725 
1726 static LIST_HEAD(xfrm_km_list);
1727 
1728 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1729 {
1730         struct xfrm_mgr *km;
1731 
1732         rcu_read_lock();
1733         list_for_each_entry_rcu(km, &xfrm_km_list, list)
1734                 if (km->notify_policy)
1735                         km->notify_policy(xp, dir, c);
1736         rcu_read_unlock();
1737 }
1738 
1739 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
1740 {
1741         struct xfrm_mgr *km;
1742         rcu_read_lock();
1743         list_for_each_entry_rcu(km, &xfrm_km_list, list)
1744                 if (km->notify)
1745                         km->notify(x, c);
1746         rcu_read_unlock();
1747 }
1748 
1749 EXPORT_SYMBOL(km_policy_notify);
1750 EXPORT_SYMBOL(km_state_notify);
1751 
1752 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
1753 {
1754         struct km_event c;
1755 
1756         c.data.hard = hard;
1757         c.portid = portid;
1758         c.event = XFRM_MSG_EXPIRE;
1759         km_state_notify(x, &c);
1760 }
1761 
1762 EXPORT_SYMBOL(km_state_expired);
1763 /*
1764  * We send to all registered managers regardless of failure
1765  * We are happy with one success
1766 */
1767 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1768 {
1769         int err = -EINVAL, acqret;
1770         struct xfrm_mgr *km;
1771 
1772         rcu_read_lock();
1773         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1774                 acqret = km->acquire(x, t, pol);
1775                 if (!acqret)
1776                         err = acqret;
1777         }
1778         rcu_read_unlock();
1779         return err;
1780 }
1781 EXPORT_SYMBOL(km_query);
1782 
1783 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1784 {
1785         int err = -EINVAL;
1786         struct xfrm_mgr *km;
1787 
1788         rcu_read_lock();
1789         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1790                 if (km->new_mapping)
1791                         err = km->new_mapping(x, ipaddr, sport);
1792                 if (!err)
1793                         break;
1794         }
1795         rcu_read_unlock();
1796         return err;
1797 }
1798 EXPORT_SYMBOL(km_new_mapping);
1799 
1800 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
1801 {
1802         struct km_event c;
1803 
1804         c.data.hard = hard;
1805         c.portid = portid;
1806         c.event = XFRM_MSG_POLEXPIRE;
1807         km_policy_notify(pol, dir, &c);
1808 }
1809 EXPORT_SYMBOL(km_policy_expired);
1810 
1811 #ifdef CONFIG_XFRM_MIGRATE
1812 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1813                const struct xfrm_migrate *m, int num_migrate,
1814                const struct xfrm_kmaddress *k)
1815 {
1816         int err = -EINVAL;
1817         int ret;
1818         struct xfrm_mgr *km;
1819 
1820         rcu_read_lock();
1821         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1822                 if (km->migrate) {
1823                         ret = km->migrate(sel, dir, type, m, num_migrate, k);
1824                         if (!ret)
1825                                 err = ret;
1826                 }
1827         }
1828         rcu_read_unlock();
1829         return err;
1830 }
1831 EXPORT_SYMBOL(km_migrate);
1832 #endif
1833 
1834 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1835 {
1836         int err = -EINVAL;
1837         int ret;
1838         struct xfrm_mgr *km;
1839 
1840         rcu_read_lock();
1841         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1842                 if (km->report) {
1843                         ret = km->report(net, proto, sel, addr);
1844                         if (!ret)
1845                                 err = ret;
1846                 }
1847         }
1848         rcu_read_unlock();
1849         return err;
1850 }
1851 EXPORT_SYMBOL(km_report);
1852 
1853 bool km_is_alive(const struct km_event *c)
1854 {
1855         struct xfrm_mgr *km;
1856         bool is_alive = false;
1857 
1858         rcu_read_lock();
1859         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1860                 if (km->is_alive && km->is_alive(c)) {
1861                         is_alive = true;
1862                         break;
1863                 }
1864         }
1865         rcu_read_unlock();
1866 
1867         return is_alive;
1868 }
1869 EXPORT_SYMBOL(km_is_alive);
1870 
1871 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1872 {
1873         int err;
1874         u8 *data;
1875         struct xfrm_mgr *km;
1876         struct xfrm_policy *pol = NULL;
1877 
1878         if (optlen <= 0 || optlen > PAGE_SIZE)
1879                 return -EMSGSIZE;
1880 
1881         data = kmalloc(optlen, GFP_KERNEL);
1882         if (!data)
1883                 return -ENOMEM;
1884 
1885         err = -EFAULT;
1886         if (copy_from_user(data, optval, optlen))
1887                 goto out;
1888 
1889         err = -EINVAL;
1890         rcu_read_lock();
1891         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1892                 pol = km->compile_policy(sk, optname, data,
1893                                          optlen, &err);
1894                 if (err >= 0)
1895                         break;
1896         }
1897         rcu_read_unlock();
1898 
1899         if (err >= 0) {
1900                 xfrm_sk_policy_insert(sk, err, pol);
1901                 xfrm_pol_put(pol);
1902                 err = 0;
1903         }
1904 
1905 out:
1906         kfree(data);
1907         return err;
1908 }
1909 EXPORT_SYMBOL(xfrm_user_policy);
1910 
1911 static DEFINE_SPINLOCK(xfrm_km_lock);
1912 
1913 int xfrm_register_km(struct xfrm_mgr *km)
1914 {
1915         spin_lock_bh(&xfrm_km_lock);
1916         list_add_tail_rcu(&km->list, &xfrm_km_list);
1917         spin_unlock_bh(&xfrm_km_lock);
1918         return 0;
1919 }
1920 EXPORT_SYMBOL(xfrm_register_km);
1921 
1922 int xfrm_unregister_km(struct xfrm_mgr *km)
1923 {
1924         spin_lock_bh(&xfrm_km_lock);
1925         list_del_rcu(&km->list);
1926         spin_unlock_bh(&xfrm_km_lock);
1927         synchronize_rcu();
1928         return 0;
1929 }
1930 EXPORT_SYMBOL(xfrm_unregister_km);
1931 
1932 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1933 {
1934         int err = 0;
1935         if (unlikely(afinfo == NULL))
1936                 return -EINVAL;
1937         if (unlikely(afinfo->family >= NPROTO))
1938                 return -EAFNOSUPPORT;
1939         spin_lock_bh(&xfrm_state_afinfo_lock);
1940         if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1941                 err = -EEXIST;
1942         else
1943                 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
1944         spin_unlock_bh(&xfrm_state_afinfo_lock);
1945         return err;
1946 }
1947 EXPORT_SYMBOL(xfrm_state_register_afinfo);
1948 
1949 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1950 {
1951         int err = 0;
1952         if (unlikely(afinfo == NULL))
1953                 return -EINVAL;
1954         if (unlikely(afinfo->family >= NPROTO))
1955                 return -EAFNOSUPPORT;
1956         spin_lock_bh(&xfrm_state_afinfo_lock);
1957         if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1958                 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1959                         err = -EINVAL;
1960                 else
1961                         RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
1962         }
1963         spin_unlock_bh(&xfrm_state_afinfo_lock);
1964         synchronize_rcu();
1965         return err;
1966 }
1967 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1968 
1969 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1970 {
1971         struct xfrm_state_afinfo *afinfo;
1972         if (unlikely(family >= NPROTO))
1973                 return NULL;
1974         rcu_read_lock();
1975         afinfo = rcu_dereference(xfrm_state_afinfo[family]);
1976         if (unlikely(!afinfo))
1977                 rcu_read_unlock();
1978         return afinfo;
1979 }
1980 
1981 void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
1982 {
1983         rcu_read_unlock();
1984 }
1985 
1986 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
1987 void xfrm_state_delete_tunnel(struct xfrm_state *x)
1988 {
1989         if (x->tunnel) {
1990                 struct xfrm_state *t = x->tunnel;
1991 
1992                 if (atomic_read(&t->tunnel_users) == 2)
1993                         xfrm_state_delete(t);
1994                 atomic_dec(&t->tunnel_users);
1995                 xfrm_state_put(t);
1996                 x->tunnel = NULL;
1997         }
1998 }
1999 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
2000 
2001 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
2002 {
2003         int res;
2004 
2005         spin_lock_bh(&x->lock);
2006         if (x->km.state == XFRM_STATE_VALID &&
2007             x->type && x->type->get_mtu)
2008                 res = x->type->get_mtu(x, mtu);
2009         else
2010                 res = mtu - x->props.header_len;
2011         spin_unlock_bh(&x->lock);
2012         return res;
2013 }
2014 
2015 int __xfrm_init_state(struct xfrm_state *x, bool init_replay)
2016 {
2017         struct xfrm_state_afinfo *afinfo;
2018         struct xfrm_mode *inner_mode;
2019         int family = x->props.family;
2020         int err;
2021 
2022         err = -EAFNOSUPPORT;
2023         afinfo = xfrm_state_get_afinfo(family);
2024         if (!afinfo)
2025                 goto error;
2026 
2027         err = 0;
2028         if (afinfo->init_flags)
2029                 err = afinfo->init_flags(x);
2030 
2031         xfrm_state_put_afinfo(afinfo);
2032 
2033         if (err)
2034                 goto error;
2035 
2036         err = -EPROTONOSUPPORT;
2037 
2038         if (x->sel.family != AF_UNSPEC) {
2039                 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2040                 if (inner_mode == NULL)
2041                         goto error;
2042 
2043                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2044                     family != x->sel.family) {
2045                         xfrm_put_mode(inner_mode);
2046                         goto error;
2047                 }
2048 
2049                 x->inner_mode = inner_mode;
2050         } else {
2051                 struct xfrm_mode *inner_mode_iaf;
2052                 int iafamily = AF_INET;
2053 
2054                 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2055                 if (inner_mode == NULL)
2056                         goto error;
2057 
2058                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
2059                         xfrm_put_mode(inner_mode);
2060                         goto error;
2061                 }
2062                 x->inner_mode = inner_mode;
2063 
2064                 if (x->props.family == AF_INET)
2065                         iafamily = AF_INET6;
2066 
2067                 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2068                 if (inner_mode_iaf) {
2069                         if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2070                                 x->inner_mode_iaf = inner_mode_iaf;
2071                         else
2072                                 xfrm_put_mode(inner_mode_iaf);
2073                 }
2074         }
2075 
2076         x->type = xfrm_get_type(x->id.proto, family);
2077         if (x->type == NULL)
2078                 goto error;
2079 
2080         err = x->type->init_state(x);
2081         if (err)
2082                 goto error;
2083 
2084         x->outer_mode = xfrm_get_mode(x->props.mode, family);
2085         if (x->outer_mode == NULL) {
2086                 err = -EPROTONOSUPPORT;
2087                 goto error;
2088         }
2089 
2090         if (init_replay) {
2091                 err = xfrm_init_replay(x);
2092                 if (err)
2093                         goto error;
2094         }
2095 
2096         x->km.state = XFRM_STATE_VALID;
2097 
2098 error:
2099         return err;
2100 }
2101 
2102 EXPORT_SYMBOL(__xfrm_init_state);
2103 
2104 int xfrm_init_state(struct xfrm_state *x)
2105 {
2106         return __xfrm_init_state(x, true);
2107 }
2108 
2109 EXPORT_SYMBOL(xfrm_init_state);
2110 
2111 int __net_init xfrm_state_init(struct net *net)
2112 {
2113         unsigned int sz;
2114 
2115         INIT_LIST_HEAD(&net->xfrm.state_all);
2116 
2117         sz = sizeof(struct hlist_head) * 8;
2118 
2119         net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2120         if (!net->xfrm.state_bydst)
2121                 goto out_bydst;
2122         net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2123         if (!net->xfrm.state_bysrc)
2124                 goto out_bysrc;
2125         net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2126         if (!net->xfrm.state_byspi)
2127                 goto out_byspi;
2128         net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2129 
2130         net->xfrm.state_num = 0;
2131         INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2132         spin_lock_init(&net->xfrm.xfrm_state_lock);
2133         return 0;
2134 
2135 out_byspi:
2136         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2137 out_bysrc:
2138         xfrm_hash_free(net->xfrm.state_bydst, sz);
2139 out_bydst:
2140         return -ENOMEM;
2141 }
2142 
2143 void xfrm_state_fini(struct net *net)
2144 {
2145         unsigned int sz;
2146 
2147         flush_work(&net->xfrm.state_hash_work);
2148         xfrm_state_flush(net, IPSEC_PROTO_ANY, false);
2149         flush_work(&xfrm_state_gc_work);
2150 
2151         WARN_ON(!list_empty(&net->xfrm.state_all));
2152 
2153         sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2154         WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2155         xfrm_hash_free(net->xfrm.state_byspi, sz);
2156         WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2157         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2158         WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2159         xfrm_hash_free(net->xfrm.state_bydst, sz);
2160 }
2161 
2162 #ifdef CONFIG_AUDITSYSCALL
2163 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2164                                      struct audit_buffer *audit_buf)
2165 {
2166         struct xfrm_sec_ctx *ctx = x->security;
2167         u32 spi = ntohl(x->id.spi);
2168 
2169         if (ctx)
2170                 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2171                                  ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2172 
2173         switch (x->props.family) {
2174         case AF_INET:
2175                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2176                                  &x->props.saddr.a4, &x->id.daddr.a4);
2177                 break;
2178         case AF_INET6:
2179                 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2180                                  x->props.saddr.a6, x->id.daddr.a6);
2181                 break;
2182         }
2183 
2184         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2185 }
2186 
2187 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2188                                       struct audit_buffer *audit_buf)
2189 {
2190         const struct iphdr *iph4;
2191         const struct ipv6hdr *iph6;
2192 
2193         switch (family) {
2194         case AF_INET:
2195                 iph4 = ip_hdr(skb);
2196                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2197                                  &iph4->saddr, &iph4->daddr);
2198                 break;
2199         case AF_INET6:
2200                 iph6 = ipv6_hdr(skb);
2201                 audit_log_format(audit_buf,
2202                                  " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2203                                  &iph6->saddr, &iph6->daddr,
2204                                  iph6->flow_lbl[0] & 0x0f,
2205                                  iph6->flow_lbl[1],
2206                                  iph6->flow_lbl[2]);
2207                 break;
2208         }
2209 }
2210 
2211 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
2212 {
2213         struct audit_buffer *audit_buf;
2214 
2215         audit_buf = xfrm_audit_start("SAD-add");
2216         if (audit_buf == NULL)
2217                 return;
2218         xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2219         xfrm_audit_helper_sainfo(x, audit_buf);
2220         audit_log_format(audit_buf, " res=%u", result);
2221         audit_log_end(audit_buf);
2222 }
2223 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2224 
2225 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
2226 {
2227         struct audit_buffer *audit_buf;
2228 
2229         audit_buf = xfrm_audit_start("SAD-delete");
2230         if (audit_buf == NULL)
2231                 return;
2232         xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2233         xfrm_audit_helper_sainfo(x, audit_buf);
2234         audit_log_format(audit_buf, " res=%u", result);
2235         audit_log_end(audit_buf);
2236 }
2237 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2238 
2239 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2240                                       struct sk_buff *skb)
2241 {
2242         struct audit_buffer *audit_buf;
2243         u32 spi;
2244 
2245         audit_buf = xfrm_audit_start("SA-replay-overflow");
2246         if (audit_buf == NULL)
2247                 return;
2248         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2249         /* don't record the sequence number because it's inherent in this kind
2250          * of audit message */
2251         spi = ntohl(x->id.spi);
2252         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2253         audit_log_end(audit_buf);
2254 }
2255 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2256 
2257 void xfrm_audit_state_replay(struct xfrm_state *x,
2258                              struct sk_buff *skb, __be32 net_seq)
2259 {
2260         struct audit_buffer *audit_buf;
2261         u32 spi;
2262 
2263         audit_buf = xfrm_audit_start("SA-replayed-pkt");
2264         if (audit_buf == NULL)
2265                 return;
2266         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2267         spi = ntohl(x->id.spi);
2268         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2269                          spi, spi, ntohl(net_seq));
2270         audit_log_end(audit_buf);
2271 }
2272 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2273 
2274 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2275 {
2276         struct audit_buffer *audit_buf;
2277 
2278         audit_buf = xfrm_audit_start("SA-notfound");
2279         if (audit_buf == NULL)
2280                 return;
2281         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2282         audit_log_end(audit_buf);
2283 }
2284 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2285 
2286 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2287                                __be32 net_spi, __be32 net_seq)
2288 {
2289         struct audit_buffer *audit_buf;
2290         u32 spi;
2291 
2292         audit_buf = xfrm_audit_start("SA-notfound");
2293         if (audit_buf == NULL)
2294                 return;
2295         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2296         spi = ntohl(net_spi);
2297         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2298                          spi, spi, ntohl(net_seq));
2299         audit_log_end(audit_buf);
2300 }
2301 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2302 
2303 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2304                               struct sk_buff *skb, u8 proto)
2305 {
2306         struct audit_buffer *audit_buf;
2307         __be32 net_spi;
2308         __be32 net_seq;
2309 
2310         audit_buf = xfrm_audit_start("SA-icv-failure");
2311         if (audit_buf == NULL)
2312                 return;
2313         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2314         if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2315                 u32 spi = ntohl(net_spi);
2316                 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2317                                  spi, spi, ntohl(net_seq));
2318         }
2319         audit_log_end(audit_buf);
2320 }
2321 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2322 #endif /* CONFIG_AUDITSYSCALL */
2323 

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