674f2780cedde397f2efd1c2f5c315e1e49aea10
[linux-2.6.git] / net / xfrm / xfrm_state.c
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 DEFINE_SPINLOCK(xfrm_state_lock);
39
40 static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
41
42 static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
43 static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
44
45 #ifdef CONFIG_AUDITSYSCALL
46 static void xfrm_audit_state_replay(struct xfrm_state *x,
47                                     struct sk_buff *skb, __be32 net_seq);
48 #else
49 #define xfrm_audit_state_replay(x, s, sq)       do { ; } while (0)
50 #endif /* CONFIG_AUDITSYSCALL */
51
52 static inline unsigned int xfrm_dst_hash(struct net *net,
53                                          xfrm_address_t *daddr,
54                                          xfrm_address_t *saddr,
55                                          u32 reqid,
56                                          unsigned short family)
57 {
58         return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
59 }
60
61 static inline unsigned int xfrm_src_hash(struct net *net,
62                                          xfrm_address_t *daddr,
63                                          xfrm_address_t *saddr,
64                                          unsigned short family)
65 {
66         return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
67 }
68
69 static inline unsigned int
70 xfrm_spi_hash(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family)
71 {
72         return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
73 }
74
75 static void xfrm_hash_transfer(struct hlist_head *list,
76                                struct hlist_head *ndsttable,
77                                struct hlist_head *nsrctable,
78                                struct hlist_head *nspitable,
79                                unsigned int nhashmask)
80 {
81         struct hlist_node *entry, *tmp;
82         struct xfrm_state *x;
83
84         hlist_for_each_entry_safe(x, entry, tmp, list, bydst) {
85                 unsigned int h;
86
87                 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
88                                     x->props.reqid, x->props.family,
89                                     nhashmask);
90                 hlist_add_head(&x->bydst, ndsttable+h);
91
92                 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
93                                     x->props.family,
94                                     nhashmask);
95                 hlist_add_head(&x->bysrc, nsrctable+h);
96
97                 if (x->id.spi) {
98                         h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
99                                             x->id.proto, x->props.family,
100                                             nhashmask);
101                         hlist_add_head(&x->byspi, nspitable+h);
102                 }
103         }
104 }
105
106 static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
107 {
108         return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
109 }
110
111 static DEFINE_MUTEX(hash_resize_mutex);
112
113 static void xfrm_hash_resize(struct work_struct *work)
114 {
115         struct net *net = container_of(work, struct net, xfrm.state_hash_work);
116         struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
117         unsigned long nsize, osize;
118         unsigned int nhashmask, ohashmask;
119         int i;
120
121         mutex_lock(&hash_resize_mutex);
122
123         nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
124         ndst = xfrm_hash_alloc(nsize);
125         if (!ndst)
126                 goto out_unlock;
127         nsrc = xfrm_hash_alloc(nsize);
128         if (!nsrc) {
129                 xfrm_hash_free(ndst, nsize);
130                 goto out_unlock;
131         }
132         nspi = xfrm_hash_alloc(nsize);
133         if (!nspi) {
134                 xfrm_hash_free(ndst, nsize);
135                 xfrm_hash_free(nsrc, nsize);
136                 goto out_unlock;
137         }
138
139         spin_lock_bh(&xfrm_state_lock);
140
141         nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
142         for (i = net->xfrm.state_hmask; i >= 0; i--)
143                 xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi,
144                                    nhashmask);
145
146         odst = net->xfrm.state_bydst;
147         osrc = net->xfrm.state_bysrc;
148         ospi = net->xfrm.state_byspi;
149         ohashmask = net->xfrm.state_hmask;
150
151         net->xfrm.state_bydst = ndst;
152         net->xfrm.state_bysrc = nsrc;
153         net->xfrm.state_byspi = nspi;
154         net->xfrm.state_hmask = nhashmask;
155
156         spin_unlock_bh(&xfrm_state_lock);
157
158         osize = (ohashmask + 1) * sizeof(struct hlist_head);
159         xfrm_hash_free(odst, osize);
160         xfrm_hash_free(osrc, osize);
161         xfrm_hash_free(ospi, osize);
162
163 out_unlock:
164         mutex_unlock(&hash_resize_mutex);
165 }
166
167 static DEFINE_RWLOCK(xfrm_state_afinfo_lock);
168 static struct xfrm_state_afinfo *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 void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
176
177 static struct xfrm_state_afinfo *xfrm_state_lock_afinfo(unsigned int family)
178 {
179         struct xfrm_state_afinfo *afinfo;
180         if (unlikely(family >= NPROTO))
181                 return NULL;
182         write_lock_bh(&xfrm_state_afinfo_lock);
183         afinfo = xfrm_state_afinfo[family];
184         if (unlikely(!afinfo))
185                 write_unlock_bh(&xfrm_state_afinfo_lock);
186         return afinfo;
187 }
188
189 static void xfrm_state_unlock_afinfo(struct xfrm_state_afinfo *afinfo)
190         __releases(xfrm_state_afinfo_lock)
191 {
192         write_unlock_bh(&xfrm_state_afinfo_lock);
193 }
194
195 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
196 {
197         struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family);
198         const struct xfrm_type **typemap;
199         int err = 0;
200
201         if (unlikely(afinfo == NULL))
202                 return -EAFNOSUPPORT;
203         typemap = afinfo->type_map;
204
205         if (likely(typemap[type->proto] == NULL))
206                 typemap[type->proto] = type;
207         else
208                 err = -EEXIST;
209         xfrm_state_unlock_afinfo(afinfo);
210         return err;
211 }
212 EXPORT_SYMBOL(xfrm_register_type);
213
214 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
215 {
216         struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family);
217         const struct xfrm_type **typemap;
218         int err = 0;
219
220         if (unlikely(afinfo == NULL))
221                 return -EAFNOSUPPORT;
222         typemap = afinfo->type_map;
223
224         if (unlikely(typemap[type->proto] != type))
225                 err = -ENOENT;
226         else
227                 typemap[type->proto] = NULL;
228         xfrm_state_unlock_afinfo(afinfo);
229         return err;
230 }
231 EXPORT_SYMBOL(xfrm_unregister_type);
232
233 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
234 {
235         struct xfrm_state_afinfo *afinfo;
236         const struct xfrm_type **typemap;
237         const struct xfrm_type *type;
238         int modload_attempted = 0;
239
240 retry:
241         afinfo = xfrm_state_get_afinfo(family);
242         if (unlikely(afinfo == NULL))
243                 return NULL;
244         typemap = afinfo->type_map;
245
246         type = typemap[proto];
247         if (unlikely(type && !try_module_get(type->owner)))
248                 type = NULL;
249         if (!type && !modload_attempted) {
250                 xfrm_state_put_afinfo(afinfo);
251                 request_module("xfrm-type-%d-%d", family, proto);
252                 modload_attempted = 1;
253                 goto retry;
254         }
255
256         xfrm_state_put_afinfo(afinfo);
257         return type;
258 }
259
260 static void xfrm_put_type(const struct xfrm_type *type)
261 {
262         module_put(type->owner);
263 }
264
265 int xfrm_register_mode(struct xfrm_mode *mode, int family)
266 {
267         struct xfrm_state_afinfo *afinfo;
268         struct xfrm_mode **modemap;
269         int err;
270
271         if (unlikely(mode->encap >= XFRM_MODE_MAX))
272                 return -EINVAL;
273
274         afinfo = xfrm_state_lock_afinfo(family);
275         if (unlikely(afinfo == NULL))
276                 return -EAFNOSUPPORT;
277
278         err = -EEXIST;
279         modemap = afinfo->mode_map;
280         if (modemap[mode->encap])
281                 goto out;
282
283         err = -ENOENT;
284         if (!try_module_get(afinfo->owner))
285                 goto out;
286
287         mode->afinfo = afinfo;
288         modemap[mode->encap] = mode;
289         err = 0;
290
291 out:
292         xfrm_state_unlock_afinfo(afinfo);
293         return err;
294 }
295 EXPORT_SYMBOL(xfrm_register_mode);
296
297 int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
298 {
299         struct xfrm_state_afinfo *afinfo;
300         struct xfrm_mode **modemap;
301         int err;
302
303         if (unlikely(mode->encap >= XFRM_MODE_MAX))
304                 return -EINVAL;
305
306         afinfo = xfrm_state_lock_afinfo(family);
307         if (unlikely(afinfo == NULL))
308                 return -EAFNOSUPPORT;
309
310         err = -ENOENT;
311         modemap = afinfo->mode_map;
312         if (likely(modemap[mode->encap] == mode)) {
313                 modemap[mode->encap] = NULL;
314                 module_put(mode->afinfo->owner);
315                 err = 0;
316         }
317
318         xfrm_state_unlock_afinfo(afinfo);
319         return err;
320 }
321 EXPORT_SYMBOL(xfrm_unregister_mode);
322
323 static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
324 {
325         struct xfrm_state_afinfo *afinfo;
326         struct xfrm_mode *mode;
327         int modload_attempted = 0;
328
329         if (unlikely(encap >= XFRM_MODE_MAX))
330                 return NULL;
331
332 retry:
333         afinfo = xfrm_state_get_afinfo(family);
334         if (unlikely(afinfo == NULL))
335                 return NULL;
336
337         mode = afinfo->mode_map[encap];
338         if (unlikely(mode && !try_module_get(mode->owner)))
339                 mode = NULL;
340         if (!mode && !modload_attempted) {
341                 xfrm_state_put_afinfo(afinfo);
342                 request_module("xfrm-mode-%d-%d", family, encap);
343                 modload_attempted = 1;
344                 goto retry;
345         }
346
347         xfrm_state_put_afinfo(afinfo);
348         return mode;
349 }
350
351 static void xfrm_put_mode(struct xfrm_mode *mode)
352 {
353         module_put(mode->owner);
354 }
355
356 static void xfrm_state_gc_destroy(struct xfrm_state *x)
357 {
358         tasklet_hrtimer_cancel(&x->mtimer);
359         del_timer_sync(&x->rtimer);
360         kfree(x->aalg);
361         kfree(x->ealg);
362         kfree(x->calg);
363         kfree(x->encap);
364         kfree(x->coaddr);
365         if (x->inner_mode)
366                 xfrm_put_mode(x->inner_mode);
367         if (x->inner_mode_iaf)
368                 xfrm_put_mode(x->inner_mode_iaf);
369         if (x->outer_mode)
370                 xfrm_put_mode(x->outer_mode);
371         if (x->type) {
372                 x->type->destructor(x);
373                 xfrm_put_type(x->type);
374         }
375         security_xfrm_state_free(x);
376         kfree(x);
377 }
378
379 static void xfrm_state_gc_task(struct work_struct *work)
380 {
381         struct net *net = container_of(work, struct net, xfrm.state_gc_work);
382         struct xfrm_state *x;
383         struct hlist_node *entry, *tmp;
384         struct hlist_head gc_list;
385
386         spin_lock_bh(&xfrm_state_gc_lock);
387         hlist_move_list(&net->xfrm.state_gc_list, &gc_list);
388         spin_unlock_bh(&xfrm_state_gc_lock);
389
390         hlist_for_each_entry_safe(x, entry, tmp, &gc_list, gclist)
391                 xfrm_state_gc_destroy(x);
392
393         wake_up(&net->xfrm.km_waitq);
394 }
395
396 static inline unsigned long make_jiffies(long secs)
397 {
398         if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
399                 return MAX_SCHEDULE_TIMEOUT-1;
400         else
401                 return secs*HZ;
402 }
403
404 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer * me)
405 {
406         struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
407         struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
408         struct net *net = xs_net(x);
409         unsigned long now = get_seconds();
410         long next = LONG_MAX;
411         int warn = 0;
412         int err = 0;
413
414         spin_lock(&x->lock);
415         if (x->km.state == XFRM_STATE_DEAD)
416                 goto out;
417         if (x->km.state == XFRM_STATE_EXPIRED)
418                 goto expired;
419         if (x->lft.hard_add_expires_seconds) {
420                 long tmo = x->lft.hard_add_expires_seconds +
421                         x->curlft.add_time - now;
422                 if (tmo <= 0)
423                         goto expired;
424                 if (tmo < next)
425                         next = tmo;
426         }
427         if (x->lft.hard_use_expires_seconds) {
428                 long tmo = x->lft.hard_use_expires_seconds +
429                         (x->curlft.use_time ? : now) - now;
430                 if (tmo <= 0)
431                         goto expired;
432                 if (tmo < next)
433                         next = tmo;
434         }
435         if (x->km.dying)
436                 goto resched;
437         if (x->lft.soft_add_expires_seconds) {
438                 long tmo = x->lft.soft_add_expires_seconds +
439                         x->curlft.add_time - now;
440                 if (tmo <= 0)
441                         warn = 1;
442                 else if (tmo < next)
443                         next = tmo;
444         }
445         if (x->lft.soft_use_expires_seconds) {
446                 long tmo = x->lft.soft_use_expires_seconds +
447                         (x->curlft.use_time ? : now) - now;
448                 if (tmo <= 0)
449                         warn = 1;
450                 else if (tmo < next)
451                         next = tmo;
452         }
453
454         x->km.dying = warn;
455         if (warn)
456                 km_state_expired(x, 0, 0);
457 resched:
458         if (next != LONG_MAX){
459                 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
460         }
461
462         goto out;
463
464 expired:
465         if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) {
466                 x->km.state = XFRM_STATE_EXPIRED;
467                 wake_up(&net->xfrm.km_waitq);
468                 next = 2;
469                 goto resched;
470         }
471
472         err = __xfrm_state_delete(x);
473         if (!err && x->id.spi)
474                 km_state_expired(x, 1, 0);
475
476         xfrm_audit_state_delete(x, err ? 0 : 1,
477                                 audit_get_loginuid(current),
478                                 audit_get_sessionid(current), 0);
479
480 out:
481         spin_unlock(&x->lock);
482         return HRTIMER_NORESTART;
483 }
484
485 static void xfrm_replay_timer_handler(unsigned long data);
486
487 struct xfrm_state *xfrm_state_alloc(struct net *net)
488 {
489         struct xfrm_state *x;
490
491         x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
492
493         if (x) {
494                 write_pnet(&x->xs_net, net);
495                 atomic_set(&x->refcnt, 1);
496                 atomic_set(&x->tunnel_users, 0);
497                 INIT_LIST_HEAD(&x->km.all);
498                 INIT_HLIST_NODE(&x->bydst);
499                 INIT_HLIST_NODE(&x->bysrc);
500                 INIT_HLIST_NODE(&x->byspi);
501                 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler, CLOCK_REALTIME, HRTIMER_MODE_ABS);
502                 setup_timer(&x->rtimer, xfrm_replay_timer_handler,
503                                 (unsigned long)x);
504                 x->curlft.add_time = get_seconds();
505                 x->lft.soft_byte_limit = XFRM_INF;
506                 x->lft.soft_packet_limit = XFRM_INF;
507                 x->lft.hard_byte_limit = XFRM_INF;
508                 x->lft.hard_packet_limit = XFRM_INF;
509                 x->replay_maxage = 0;
510                 x->replay_maxdiff = 0;
511                 x->inner_mode = NULL;
512                 x->inner_mode_iaf = NULL;
513                 spin_lock_init(&x->lock);
514         }
515         return x;
516 }
517 EXPORT_SYMBOL(xfrm_state_alloc);
518
519 void __xfrm_state_destroy(struct xfrm_state *x)
520 {
521         struct net *net = xs_net(x);
522
523         WARN_ON(x->km.state != XFRM_STATE_DEAD);
524
525         spin_lock_bh(&xfrm_state_gc_lock);
526         hlist_add_head(&x->gclist, &net->xfrm.state_gc_list);
527         spin_unlock_bh(&xfrm_state_gc_lock);
528         schedule_work(&net->xfrm.state_gc_work);
529 }
530 EXPORT_SYMBOL(__xfrm_state_destroy);
531
532 int __xfrm_state_delete(struct xfrm_state *x)
533 {
534         struct net *net = xs_net(x);
535         int err = -ESRCH;
536
537         if (x->km.state != XFRM_STATE_DEAD) {
538                 x->km.state = XFRM_STATE_DEAD;
539                 spin_lock(&xfrm_state_lock);
540                 list_del(&x->km.all);
541                 hlist_del(&x->bydst);
542                 hlist_del(&x->bysrc);
543                 if (x->id.spi)
544                         hlist_del(&x->byspi);
545                 net->xfrm.state_num--;
546                 spin_unlock(&xfrm_state_lock);
547
548                 /* All xfrm_state objects are created by xfrm_state_alloc.
549                  * The xfrm_state_alloc call gives a reference, and that
550                  * is what we are dropping here.
551                  */
552                 xfrm_state_put(x);
553                 err = 0;
554         }
555
556         return err;
557 }
558 EXPORT_SYMBOL(__xfrm_state_delete);
559
560 int xfrm_state_delete(struct xfrm_state *x)
561 {
562         int err;
563
564         spin_lock_bh(&x->lock);
565         err = __xfrm_state_delete(x);
566         spin_unlock_bh(&x->lock);
567
568         return err;
569 }
570 EXPORT_SYMBOL(xfrm_state_delete);
571
572 #ifdef CONFIG_SECURITY_NETWORK_XFRM
573 static inline int
574 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
575 {
576         int i, err = 0;
577
578         for (i = 0; i <= net->xfrm.state_hmask; i++) {
579                 struct hlist_node *entry;
580                 struct xfrm_state *x;
581
582                 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
583                         if (xfrm_id_proto_match(x->id.proto, proto) &&
584                            (err = security_xfrm_state_delete(x)) != 0) {
585                                 xfrm_audit_state_delete(x, 0,
586                                                         audit_info->loginuid,
587                                                         audit_info->sessionid,
588                                                         audit_info->secid);
589                                 return err;
590                         }
591                 }
592         }
593
594         return err;
595 }
596 #else
597 static inline int
598 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
599 {
600         return 0;
601 }
602 #endif
603
604 int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info)
605 {
606         int i, err = 0, cnt = 0;
607
608         spin_lock_bh(&xfrm_state_lock);
609         err = xfrm_state_flush_secctx_check(net, proto, audit_info);
610         if (err)
611                 goto out;
612
613         err = -ESRCH;
614         for (i = 0; i <= net->xfrm.state_hmask; i++) {
615                 struct hlist_node *entry;
616                 struct xfrm_state *x;
617 restart:
618                 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
619                         if (!xfrm_state_kern(x) &&
620                             xfrm_id_proto_match(x->id.proto, proto)) {
621                                 xfrm_state_hold(x);
622                                 spin_unlock_bh(&xfrm_state_lock);
623
624                                 err = xfrm_state_delete(x);
625                                 xfrm_audit_state_delete(x, err ? 0 : 1,
626                                                         audit_info->loginuid,
627                                                         audit_info->sessionid,
628                                                         audit_info->secid);
629                                 xfrm_state_put(x);
630                                 if (!err)
631                                         cnt++;
632
633                                 spin_lock_bh(&xfrm_state_lock);
634                                 goto restart;
635                         }
636                 }
637         }
638         if (cnt)
639                 err = 0;
640
641 out:
642         spin_unlock_bh(&xfrm_state_lock);
643         wake_up(&net->xfrm.km_waitq);
644         return err;
645 }
646 EXPORT_SYMBOL(xfrm_state_flush);
647
648 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
649 {
650         spin_lock_bh(&xfrm_state_lock);
651         si->sadcnt = net->xfrm.state_num;
652         si->sadhcnt = net->xfrm.state_hmask;
653         si->sadhmcnt = xfrm_state_hashmax;
654         spin_unlock_bh(&xfrm_state_lock);
655 }
656 EXPORT_SYMBOL(xfrm_sad_getinfo);
657
658 static int
659 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
660                     struct xfrm_tmpl *tmpl,
661                     xfrm_address_t *daddr, xfrm_address_t *saddr,
662                     unsigned short family)
663 {
664         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
665         if (!afinfo)
666                 return -1;
667         afinfo->init_tempsel(&x->sel, fl);
668
669         if (family != tmpl->encap_family) {
670                 xfrm_state_put_afinfo(afinfo);
671                 afinfo = xfrm_state_get_afinfo(tmpl->encap_family);
672                 if (!afinfo)
673                         return -1;
674         }
675         afinfo->init_temprop(x, tmpl, daddr, saddr);
676         xfrm_state_put_afinfo(afinfo);
677         return 0;
678 }
679
680 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family)
681 {
682         unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
683         struct xfrm_state *x;
684         struct hlist_node *entry;
685
686         hlist_for_each_entry(x, entry, net->xfrm.state_byspi+h, byspi) {
687                 if (x->props.family != family ||
688                     x->id.spi       != spi ||
689                     x->id.proto     != proto ||
690                     xfrm_addr_cmp(&x->id.daddr, daddr, 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 struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark, xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family)
703 {
704         unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
705         struct xfrm_state *x;
706         struct hlist_node *entry;
707
708         hlist_for_each_entry(x, entry, net->xfrm.state_bysrc+h, bysrc) {
709                 if (x->props.family != family ||
710                     x->id.proto     != proto ||
711                     xfrm_addr_cmp(&x->id.daddr, daddr, family) ||
712                     xfrm_addr_cmp(&x->props.saddr, saddr, family))
713                         continue;
714
715                 if ((mark & x->mark.m) != x->mark.v)
716                         continue;
717                 xfrm_state_hold(x);
718                 return x;
719         }
720
721         return NULL;
722 }
723
724 static inline struct xfrm_state *
725 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
726 {
727         struct net *net = xs_net(x);
728         u32 mark = x->mark.v & x->mark.m;
729
730         if (use_spi)
731                 return __xfrm_state_lookup(net, mark, &x->id.daddr,
732                                            x->id.spi, x->id.proto, family);
733         else
734                 return __xfrm_state_lookup_byaddr(net, mark,
735                                                   &x->id.daddr,
736                                                   &x->props.saddr,
737                                                   x->id.proto, family);
738 }
739
740 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
741 {
742         if (have_hash_collision &&
743             (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
744             net->xfrm.state_num > net->xfrm.state_hmask)
745                 schedule_work(&net->xfrm.state_hash_work);
746 }
747
748 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
749                                const struct flowi *fl, unsigned short family,
750                                xfrm_address_t *daddr, xfrm_address_t *saddr,
751                                struct xfrm_state **best, int *acq_in_progress,
752                                int *error)
753 {
754         /* Resolution logic:
755          * 1. There is a valid state with matching selector. Done.
756          * 2. Valid state with inappropriate selector. Skip.
757          *
758          * Entering area of "sysdeps".
759          *
760          * 3. If state is not valid, selector is temporary, it selects
761          *    only session which triggered previous resolution. Key
762          *    manager will do something to install a state with proper
763          *    selector.
764          */
765         if (x->km.state == XFRM_STATE_VALID) {
766                 if ((x->sel.family &&
767                      !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
768                     !security_xfrm_state_pol_flow_match(x, pol, fl))
769                         return;
770
771                 if (!*best ||
772                     (*best)->km.dying > x->km.dying ||
773                     ((*best)->km.dying == x->km.dying &&
774                      (*best)->curlft.add_time < x->curlft.add_time))
775                         *best = x;
776         } else if (x->km.state == XFRM_STATE_ACQ) {
777                 *acq_in_progress = 1;
778         } else if (x->km.state == XFRM_STATE_ERROR ||
779                    x->km.state == XFRM_STATE_EXPIRED) {
780                 if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
781                     security_xfrm_state_pol_flow_match(x, pol, fl))
782                         *error = -ESRCH;
783         }
784 }
785
786 struct xfrm_state *
787 xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
788                 struct flowi *fl, struct xfrm_tmpl *tmpl,
789                 struct xfrm_policy *pol, int *err,
790                 unsigned short family)
791 {
792         static xfrm_address_t saddr_wildcard = { };
793         struct net *net = xp_net(pol);
794         unsigned int h, h_wildcard;
795         struct hlist_node *entry;
796         struct xfrm_state *x, *x0, *to_put;
797         int acquire_in_progress = 0;
798         int error = 0;
799         struct xfrm_state *best = NULL;
800         u32 mark = pol->mark.v & pol->mark.m;
801         unsigned short encap_family = tmpl->encap_family;
802
803         to_put = NULL;
804
805         spin_lock_bh(&xfrm_state_lock);
806         h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
807         hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
808                 if (x->props.family == encap_family &&
809                     x->props.reqid == tmpl->reqid &&
810                     (mark & x->mark.m) == x->mark.v &&
811                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
812                     xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
813                     tmpl->mode == x->props.mode &&
814                     tmpl->id.proto == x->id.proto &&
815                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
816                         xfrm_state_look_at(pol, x, fl, encap_family, daddr, saddr,
817                                            &best, &acquire_in_progress, &error);
818         }
819         if (best)
820                 goto found;
821
822         h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
823         hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h_wildcard, bydst) {
824                 if (x->props.family == encap_family &&
825                     x->props.reqid == tmpl->reqid &&
826                     (mark & x->mark.m) == x->mark.v &&
827                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
828                     xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
829                     tmpl->mode == x->props.mode &&
830                     tmpl->id.proto == x->id.proto &&
831                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
832                         xfrm_state_look_at(pol, x, fl, encap_family, daddr, saddr,
833                                            &best, &acquire_in_progress, &error);
834         }
835
836 found:
837         x = best;
838         if (!x && !error && !acquire_in_progress) {
839                 if (tmpl->id.spi &&
840                     (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
841                                               tmpl->id.proto, encap_family)) != NULL) {
842                         to_put = x0;
843                         error = -EEXIST;
844                         goto out;
845                 }
846                 x = xfrm_state_alloc(net);
847                 if (x == NULL) {
848                         error = -ENOMEM;
849                         goto out;
850                 }
851                 /* Initialize temporary state matching only
852                  * to current session. */
853                 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
854                 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
855
856                 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid);
857                 if (error) {
858                         x->km.state = XFRM_STATE_DEAD;
859                         to_put = x;
860                         x = NULL;
861                         goto out;
862                 }
863
864                 if (km_query(x, tmpl, pol) == 0) {
865                         x->km.state = XFRM_STATE_ACQ;
866                         list_add(&x->km.all, &net->xfrm.state_all);
867                         hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
868                         h = xfrm_src_hash(net, daddr, saddr, encap_family);
869                         hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
870                         if (x->id.spi) {
871                                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
872                                 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
873                         }
874                         x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
875                         tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
876                         net->xfrm.state_num++;
877                         xfrm_hash_grow_check(net, x->bydst.next != NULL);
878                 } else {
879                         x->km.state = XFRM_STATE_DEAD;
880                         to_put = x;
881                         x = NULL;
882                         error = -ESRCH;
883                 }
884         }
885 out:
886         if (x)
887                 xfrm_state_hold(x);
888         else
889                 *err = acquire_in_progress ? -EAGAIN : error;
890         spin_unlock_bh(&xfrm_state_lock);
891         if (to_put)
892                 xfrm_state_put(to_put);
893         return x;
894 }
895
896 struct xfrm_state *
897 xfrm_stateonly_find(struct net *net, u32 mark,
898                     xfrm_address_t *daddr, xfrm_address_t *saddr,
899                     unsigned short family, u8 mode, u8 proto, u32 reqid)
900 {
901         unsigned int h;
902         struct xfrm_state *rx = NULL, *x = NULL;
903         struct hlist_node *entry;
904
905         spin_lock(&xfrm_state_lock);
906         h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
907         hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
908                 if (x->props.family == family &&
909                     x->props.reqid == reqid &&
910                     (mark & x->mark.m) == x->mark.v &&
911                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
912                     xfrm_state_addr_check(x, daddr, saddr, family) &&
913                     mode == x->props.mode &&
914                     proto == x->id.proto &&
915                     x->km.state == XFRM_STATE_VALID) {
916                         rx = x;
917                         break;
918                 }
919         }
920
921         if (rx)
922                 xfrm_state_hold(rx);
923         spin_unlock(&xfrm_state_lock);
924
925
926         return rx;
927 }
928 EXPORT_SYMBOL(xfrm_stateonly_find);
929
930 static void __xfrm_state_insert(struct xfrm_state *x)
931 {
932         struct net *net = xs_net(x);
933         unsigned int h;
934
935         list_add(&x->km.all, &net->xfrm.state_all);
936
937         h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
938                           x->props.reqid, x->props.family);
939         hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
940
941         h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
942         hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
943
944         if (x->id.spi) {
945                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
946                                   x->props.family);
947
948                 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
949         }
950
951         tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
952         if (x->replay_maxage)
953                 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
954
955         wake_up(&net->xfrm.km_waitq);
956
957         net->xfrm.state_num++;
958
959         xfrm_hash_grow_check(net, x->bydst.next != NULL);
960 }
961
962 /* xfrm_state_lock is held */
963 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
964 {
965         struct net *net = xs_net(xnew);
966         unsigned short family = xnew->props.family;
967         u32 reqid = xnew->props.reqid;
968         struct xfrm_state *x;
969         struct hlist_node *entry;
970         unsigned int h;
971         u32 mark = xnew->mark.v & xnew->mark.m;
972
973         h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
974         hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
975                 if (x->props.family     == family &&
976                     x->props.reqid      == reqid &&
977                     (mark & x->mark.m) == x->mark.v &&
978                     !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) &&
979                     !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family))
980                         x->genid++;
981         }
982 }
983
984 void xfrm_state_insert(struct xfrm_state *x)
985 {
986         spin_lock_bh(&xfrm_state_lock);
987         __xfrm_state_bump_genids(x);
988         __xfrm_state_insert(x);
989         spin_unlock_bh(&xfrm_state_lock);
990 }
991 EXPORT_SYMBOL(xfrm_state_insert);
992
993 /* xfrm_state_lock is held */
994 static struct xfrm_state *__find_acq_core(struct net *net, struct xfrm_mark *m, unsigned short family, u8 mode, u32 reqid, u8 proto, xfrm_address_t *daddr, xfrm_address_t *saddr, int create)
995 {
996         unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
997         struct hlist_node *entry;
998         struct xfrm_state *x;
999         u32 mark = m->v & m->m;
1000
1001         hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
1002                 if (x->props.reqid  != reqid ||
1003                     x->props.mode   != mode ||
1004                     x->props.family != family ||
1005                     x->km.state     != XFRM_STATE_ACQ ||
1006                     x->id.spi       != 0 ||
1007                     x->id.proto     != proto ||
1008                     (mark & x->mark.m) != x->mark.v ||
1009                     xfrm_addr_cmp(&x->id.daddr, daddr, family) ||
1010                     xfrm_addr_cmp(&x->props.saddr, saddr, family))
1011                         continue;
1012
1013                 xfrm_state_hold(x);
1014                 return x;
1015         }
1016
1017         if (!create)
1018                 return NULL;
1019
1020         x = xfrm_state_alloc(net);
1021         if (likely(x)) {
1022                 switch (family) {
1023                 case AF_INET:
1024                         x->sel.daddr.a4 = daddr->a4;
1025                         x->sel.saddr.a4 = saddr->a4;
1026                         x->sel.prefixlen_d = 32;
1027                         x->sel.prefixlen_s = 32;
1028                         x->props.saddr.a4 = saddr->a4;
1029                         x->id.daddr.a4 = daddr->a4;
1030                         break;
1031
1032                 case AF_INET6:
1033                         ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6,
1034                                        (struct in6_addr *)daddr);
1035                         ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6,
1036                                        (struct in6_addr *)saddr);
1037                         x->sel.prefixlen_d = 128;
1038                         x->sel.prefixlen_s = 128;
1039                         ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6,
1040                                        (struct in6_addr *)saddr);
1041                         ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6,
1042                                        (struct in6_addr *)daddr);
1043                         break;
1044                 }
1045
1046                 x->km.state = XFRM_STATE_ACQ;
1047                 x->id.proto = proto;
1048                 x->props.family = family;
1049                 x->props.mode = mode;
1050                 x->props.reqid = reqid;
1051                 x->mark.v = m->v;
1052                 x->mark.m = m->m;
1053                 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1054                 xfrm_state_hold(x);
1055                 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1056                 list_add(&x->km.all, &net->xfrm.state_all);
1057                 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
1058                 h = xfrm_src_hash(net, daddr, saddr, family);
1059                 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
1060
1061                 net->xfrm.state_num++;
1062
1063                 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1064         }
1065
1066         return x;
1067 }
1068
1069 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1070
1071 int xfrm_state_add(struct xfrm_state *x)
1072 {
1073         struct net *net = xs_net(x);
1074         struct xfrm_state *x1, *to_put;
1075         int family;
1076         int err;
1077         u32 mark = x->mark.v & x->mark.m;
1078         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1079
1080         family = x->props.family;
1081
1082         to_put = NULL;
1083
1084         spin_lock_bh(&xfrm_state_lock);
1085
1086         x1 = __xfrm_state_locate(x, use_spi, family);
1087         if (x1) {
1088                 to_put = x1;
1089                 x1 = NULL;
1090                 err = -EEXIST;
1091                 goto out;
1092         }
1093
1094         if (use_spi && x->km.seq) {
1095                 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1096                 if (x1 && ((x1->id.proto != x->id.proto) ||
1097                     xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family))) {
1098                         to_put = x1;
1099                         x1 = NULL;
1100                 }
1101         }
1102
1103         if (use_spi && !x1)
1104                 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1105                                      x->props.reqid, x->id.proto,
1106                                      &x->id.daddr, &x->props.saddr, 0);
1107
1108         __xfrm_state_bump_genids(x);
1109         __xfrm_state_insert(x);
1110         err = 0;
1111
1112 out:
1113         spin_unlock_bh(&xfrm_state_lock);
1114
1115         if (x1) {
1116                 xfrm_state_delete(x1);
1117                 xfrm_state_put(x1);
1118         }
1119
1120         if (to_put)
1121                 xfrm_state_put(to_put);
1122
1123         return err;
1124 }
1125 EXPORT_SYMBOL(xfrm_state_add);
1126
1127 #ifdef CONFIG_XFRM_MIGRATE
1128 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp)
1129 {
1130         struct net *net = xs_net(orig);
1131         int err = -ENOMEM;
1132         struct xfrm_state *x = xfrm_state_alloc(net);
1133         if (!x)
1134                 goto out;
1135
1136         memcpy(&x->id, &orig->id, sizeof(x->id));
1137         memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1138         memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1139         x->props.mode = orig->props.mode;
1140         x->props.replay_window = orig->props.replay_window;
1141         x->props.reqid = orig->props.reqid;
1142         x->props.family = orig->props.family;
1143         x->props.saddr = orig->props.saddr;
1144
1145         if (orig->aalg) {
1146                 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1147                 if (!x->aalg)
1148                         goto error;
1149         }
1150         x->props.aalgo = orig->props.aalgo;
1151
1152         if (orig->ealg) {
1153                 x->ealg = xfrm_algo_clone(orig->ealg);
1154                 if (!x->ealg)
1155                         goto error;
1156         }
1157         x->props.ealgo = orig->props.ealgo;
1158
1159         if (orig->calg) {
1160                 x->calg = xfrm_algo_clone(orig->calg);
1161                 if (!x->calg)
1162                         goto error;
1163         }
1164         x->props.calgo = orig->props.calgo;
1165
1166         if (orig->encap) {
1167                 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
1168                 if (!x->encap)
1169                         goto error;
1170         }
1171
1172         if (orig->coaddr) {
1173                 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1174                                     GFP_KERNEL);
1175                 if (!x->coaddr)
1176                         goto error;
1177         }
1178
1179         memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1180
1181         err = xfrm_init_state(x);
1182         if (err)
1183                 goto error;
1184
1185         x->props.flags = orig->props.flags;
1186
1187         x->curlft.add_time = orig->curlft.add_time;
1188         x->km.state = orig->km.state;
1189         x->km.seq = orig->km.seq;
1190
1191         return x;
1192
1193  error:
1194         xfrm_state_put(x);
1195 out:
1196         if (errp)
1197                 *errp = err;
1198         return NULL;
1199 }
1200
1201 /* xfrm_state_lock is held */
1202 struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m)
1203 {
1204         unsigned int h;
1205         struct xfrm_state *x;
1206         struct hlist_node *entry;
1207
1208         if (m->reqid) {
1209                 h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr,
1210                                   m->reqid, m->old_family);
1211                 hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) {
1212                         if (x->props.mode != m->mode ||
1213                             x->id.proto != m->proto)
1214                                 continue;
1215                         if (m->reqid && x->props.reqid != m->reqid)
1216                                 continue;
1217                         if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr,
1218                                           m->old_family) ||
1219                             xfrm_addr_cmp(&x->props.saddr, &m->old_saddr,
1220                                           m->old_family))
1221                                 continue;
1222                         xfrm_state_hold(x);
1223                         return x;
1224                 }
1225         } else {
1226                 h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr,
1227                                   m->old_family);
1228                 hlist_for_each_entry(x, entry, init_net.xfrm.state_bysrc+h, bysrc) {
1229                         if (x->props.mode != m->mode ||
1230                             x->id.proto != m->proto)
1231                                 continue;
1232                         if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr,
1233                                           m->old_family) ||
1234                             xfrm_addr_cmp(&x->props.saddr, &m->old_saddr,
1235                                           m->old_family))
1236                                 continue;
1237                         xfrm_state_hold(x);
1238                         return x;
1239                 }
1240         }
1241
1242         return NULL;
1243 }
1244 EXPORT_SYMBOL(xfrm_migrate_state_find);
1245
1246 struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1247                                        struct xfrm_migrate *m)
1248 {
1249         struct xfrm_state *xc;
1250         int err;
1251
1252         xc = xfrm_state_clone(x, &err);
1253         if (!xc)
1254                 return NULL;
1255
1256         memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1257         memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1258
1259         /* add state */
1260         if (!xfrm_addr_cmp(&x->id.daddr, &m->new_daddr, m->new_family)) {
1261                 /* a care is needed when the destination address of the
1262                    state is to be updated as it is a part of triplet */
1263                 xfrm_state_insert(xc);
1264         } else {
1265                 if ((err = xfrm_state_add(xc)) < 0)
1266                         goto error;
1267         }
1268
1269         return xc;
1270 error:
1271         xfrm_state_put(xc);
1272         return NULL;
1273 }
1274 EXPORT_SYMBOL(xfrm_state_migrate);
1275 #endif
1276
1277 int xfrm_state_update(struct xfrm_state *x)
1278 {
1279         struct xfrm_state *x1, *to_put;
1280         int err;
1281         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1282
1283         to_put = NULL;
1284
1285         spin_lock_bh(&xfrm_state_lock);
1286         x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1287
1288         err = -ESRCH;
1289         if (!x1)
1290                 goto out;
1291
1292         if (xfrm_state_kern(x1)) {
1293                 to_put = x1;
1294                 err = -EEXIST;
1295                 goto out;
1296         }
1297
1298         if (x1->km.state == XFRM_STATE_ACQ) {
1299                 __xfrm_state_insert(x);
1300                 x = NULL;
1301         }
1302         err = 0;
1303
1304 out:
1305         spin_unlock_bh(&xfrm_state_lock);
1306
1307         if (to_put)
1308                 xfrm_state_put(to_put);
1309
1310         if (err)
1311                 return err;
1312
1313         if (!x) {
1314                 xfrm_state_delete(x1);
1315                 xfrm_state_put(x1);
1316                 return 0;
1317         }
1318
1319         err = -EINVAL;
1320         spin_lock_bh(&x1->lock);
1321         if (likely(x1->km.state == XFRM_STATE_VALID)) {
1322                 if (x->encap && x1->encap)
1323                         memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1324                 if (x->coaddr && x1->coaddr) {
1325                         memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1326                 }
1327                 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1328                         memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1329                 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1330                 x1->km.dying = 0;
1331
1332                 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1333                 if (x1->curlft.use_time)
1334                         xfrm_state_check_expire(x1);
1335
1336                 err = 0;
1337         }
1338         spin_unlock_bh(&x1->lock);
1339
1340         xfrm_state_put(x1);
1341
1342         return err;
1343 }
1344 EXPORT_SYMBOL(xfrm_state_update);
1345
1346 int xfrm_state_check_expire(struct xfrm_state *x)
1347 {
1348         if (!x->curlft.use_time)
1349                 x->curlft.use_time = get_seconds();
1350
1351         if (x->km.state != XFRM_STATE_VALID)
1352                 return -EINVAL;
1353
1354         if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1355             x->curlft.packets >= x->lft.hard_packet_limit) {
1356                 x->km.state = XFRM_STATE_EXPIRED;
1357                 tasklet_hrtimer_start(&x->mtimer, ktime_set(0,0), HRTIMER_MODE_REL);
1358                 return -EINVAL;
1359         }
1360
1361         if (!x->km.dying &&
1362             (x->curlft.bytes >= x->lft.soft_byte_limit ||
1363              x->curlft.packets >= x->lft.soft_packet_limit)) {
1364                 x->km.dying = 1;
1365                 km_state_expired(x, 0, 0);
1366         }
1367         return 0;
1368 }
1369 EXPORT_SYMBOL(xfrm_state_check_expire);
1370
1371 struct xfrm_state *
1372 xfrm_state_lookup(struct net *net, u32 mark, xfrm_address_t *daddr, __be32 spi,
1373                   u8 proto, unsigned short family)
1374 {
1375         struct xfrm_state *x;
1376
1377         spin_lock_bh(&xfrm_state_lock);
1378         x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1379         spin_unlock_bh(&xfrm_state_lock);
1380         return x;
1381 }
1382 EXPORT_SYMBOL(xfrm_state_lookup);
1383
1384 struct xfrm_state *
1385 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1386                          xfrm_address_t *daddr, xfrm_address_t *saddr,
1387                          u8 proto, unsigned short family)
1388 {
1389         struct xfrm_state *x;
1390
1391         spin_lock_bh(&xfrm_state_lock);
1392         x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1393         spin_unlock_bh(&xfrm_state_lock);
1394         return x;
1395 }
1396 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1397
1398 struct xfrm_state *
1399 xfrm_find_acq(struct net *net, struct xfrm_mark *mark, u8 mode, u32 reqid, u8 proto,
1400               xfrm_address_t *daddr, xfrm_address_t *saddr,
1401               int create, unsigned short family)
1402 {
1403         struct xfrm_state *x;
1404
1405         spin_lock_bh(&xfrm_state_lock);
1406         x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create);
1407         spin_unlock_bh(&xfrm_state_lock);
1408
1409         return x;
1410 }
1411 EXPORT_SYMBOL(xfrm_find_acq);
1412
1413 #ifdef CONFIG_XFRM_SUB_POLICY
1414 int
1415 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1416                unsigned short family)
1417 {
1418         int err = 0;
1419         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1420         if (!afinfo)
1421                 return -EAFNOSUPPORT;
1422
1423         spin_lock_bh(&xfrm_state_lock);
1424         if (afinfo->tmpl_sort)
1425                 err = afinfo->tmpl_sort(dst, src, n);
1426         spin_unlock_bh(&xfrm_state_lock);
1427         xfrm_state_put_afinfo(afinfo);
1428         return err;
1429 }
1430 EXPORT_SYMBOL(xfrm_tmpl_sort);
1431
1432 int
1433 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1434                 unsigned short family)
1435 {
1436         int err = 0;
1437         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1438         if (!afinfo)
1439                 return -EAFNOSUPPORT;
1440
1441         spin_lock_bh(&xfrm_state_lock);
1442         if (afinfo->state_sort)
1443                 err = afinfo->state_sort(dst, src, n);
1444         spin_unlock_bh(&xfrm_state_lock);
1445         xfrm_state_put_afinfo(afinfo);
1446         return err;
1447 }
1448 EXPORT_SYMBOL(xfrm_state_sort);
1449 #endif
1450
1451 /* Silly enough, but I'm lazy to build resolution list */
1452
1453 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1454 {
1455         int i;
1456
1457         for (i = 0; i <= net->xfrm.state_hmask; i++) {
1458                 struct hlist_node *entry;
1459                 struct xfrm_state *x;
1460
1461                 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
1462                         if (x->km.seq == seq &&
1463                             (mark & x->mark.m) == x->mark.v &&
1464                             x->km.state == XFRM_STATE_ACQ) {
1465                                 xfrm_state_hold(x);
1466                                 return x;
1467                         }
1468                 }
1469         }
1470         return NULL;
1471 }
1472
1473 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1474 {
1475         struct xfrm_state *x;
1476
1477         spin_lock_bh(&xfrm_state_lock);
1478         x = __xfrm_find_acq_byseq(net, mark, seq);
1479         spin_unlock_bh(&xfrm_state_lock);
1480         return x;
1481 }
1482 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1483
1484 u32 xfrm_get_acqseq(void)
1485 {
1486         u32 res;
1487         static atomic_t acqseq;
1488
1489         do {
1490                 res = atomic_inc_return(&acqseq);
1491         } while (!res);
1492
1493         return res;
1494 }
1495 EXPORT_SYMBOL(xfrm_get_acqseq);
1496
1497 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1498 {
1499         struct net *net = xs_net(x);
1500         unsigned int h;
1501         struct xfrm_state *x0;
1502         int err = -ENOENT;
1503         __be32 minspi = htonl(low);
1504         __be32 maxspi = htonl(high);
1505         u32 mark = x->mark.v & x->mark.m;
1506
1507         spin_lock_bh(&x->lock);
1508         if (x->km.state == XFRM_STATE_DEAD)
1509                 goto unlock;
1510
1511         err = 0;
1512         if (x->id.spi)
1513                 goto unlock;
1514
1515         err = -ENOENT;
1516
1517         if (minspi == maxspi) {
1518                 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1519                 if (x0) {
1520                         xfrm_state_put(x0);
1521                         goto unlock;
1522                 }
1523                 x->id.spi = minspi;
1524         } else {
1525                 u32 spi = 0;
1526                 for (h=0; h<high-low+1; h++) {
1527                         spi = low + net_random()%(high-low+1);
1528                         x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1529                         if (x0 == NULL) {
1530                                 x->id.spi = htonl(spi);
1531                                 break;
1532                         }
1533                         xfrm_state_put(x0);
1534                 }
1535         }
1536         if (x->id.spi) {
1537                 spin_lock_bh(&xfrm_state_lock);
1538                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1539                 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
1540                 spin_unlock_bh(&xfrm_state_lock);
1541
1542                 err = 0;
1543         }
1544
1545 unlock:
1546         spin_unlock_bh(&x->lock);
1547
1548         return err;
1549 }
1550 EXPORT_SYMBOL(xfrm_alloc_spi);
1551
1552 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1553                     int (*func)(struct xfrm_state *, int, void*),
1554                     void *data)
1555 {
1556         struct xfrm_state *state;
1557         struct xfrm_state_walk *x;
1558         int err = 0;
1559
1560         if (walk->seq != 0 && list_empty(&walk->all))
1561                 return 0;
1562
1563         spin_lock_bh(&xfrm_state_lock);
1564         if (list_empty(&walk->all))
1565                 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1566         else
1567                 x = list_entry(&walk->all, struct xfrm_state_walk, all);
1568         list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1569                 if (x->state == XFRM_STATE_DEAD)
1570                         continue;
1571                 state = container_of(x, struct xfrm_state, km);
1572                 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1573                         continue;
1574                 err = func(state, walk->seq, data);
1575                 if (err) {
1576                         list_move_tail(&walk->all, &x->all);
1577                         goto out;
1578                 }
1579                 walk->seq++;
1580         }
1581         if (walk->seq == 0) {
1582                 err = -ENOENT;
1583                 goto out;
1584         }
1585         list_del_init(&walk->all);
1586 out:
1587         spin_unlock_bh(&xfrm_state_lock);
1588         return err;
1589 }
1590 EXPORT_SYMBOL(xfrm_state_walk);
1591
1592 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto)
1593 {
1594         INIT_LIST_HEAD(&walk->all);
1595         walk->proto = proto;
1596         walk->state = XFRM_STATE_DEAD;
1597         walk->seq = 0;
1598 }
1599 EXPORT_SYMBOL(xfrm_state_walk_init);
1600
1601 void xfrm_state_walk_done(struct xfrm_state_walk *walk)
1602 {
1603         if (list_empty(&walk->all))
1604                 return;
1605
1606         spin_lock_bh(&xfrm_state_lock);
1607         list_del(&walk->all);
1608         spin_unlock_bh(&xfrm_state_lock);
1609 }
1610 EXPORT_SYMBOL(xfrm_state_walk_done);
1611
1612
1613 void xfrm_replay_notify(struct xfrm_state *x, int event)
1614 {
1615         struct km_event c;
1616         /* we send notify messages in case
1617          *  1. we updated on of the sequence numbers, and the seqno difference
1618          *     is at least x->replay_maxdiff, in this case we also update the
1619          *     timeout of our timer function
1620          *  2. if x->replay_maxage has elapsed since last update,
1621          *     and there were changes
1622          *
1623          *  The state structure must be locked!
1624          */
1625
1626         switch (event) {
1627         case XFRM_REPLAY_UPDATE:
1628                 if (x->replay_maxdiff &&
1629                     (x->replay.seq - x->preplay.seq < x->replay_maxdiff) &&
1630                     (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) {
1631                         if (x->xflags & XFRM_TIME_DEFER)
1632                                 event = XFRM_REPLAY_TIMEOUT;
1633                         else
1634                                 return;
1635                 }
1636
1637                 break;
1638
1639         case XFRM_REPLAY_TIMEOUT:
1640                 if ((x->replay.seq == x->preplay.seq) &&
1641                     (x->replay.bitmap == x->preplay.bitmap) &&
1642                     (x->replay.oseq == x->preplay.oseq)) {
1643                         x->xflags |= XFRM_TIME_DEFER;
1644                         return;
1645                 }
1646
1647                 break;
1648         }
1649
1650         memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state));
1651         c.event = XFRM_MSG_NEWAE;
1652         c.data.aevent = event;
1653         km_state_notify(x, &c);
1654
1655         if (x->replay_maxage &&
1656             !mod_timer(&x->rtimer, jiffies + x->replay_maxage))
1657                 x->xflags &= ~XFRM_TIME_DEFER;
1658 }
1659
1660 static void xfrm_replay_timer_handler(unsigned long data)
1661 {
1662         struct xfrm_state *x = (struct xfrm_state*)data;
1663
1664         spin_lock(&x->lock);
1665
1666         if (x->km.state == XFRM_STATE_VALID) {
1667                 if (xfrm_aevent_is_on(xs_net(x)))
1668                         xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT);
1669                 else
1670                         x->xflags |= XFRM_TIME_DEFER;
1671         }
1672
1673         spin_unlock(&x->lock);
1674 }
1675
1676 int xfrm_replay_check(struct xfrm_state *x,
1677                       struct sk_buff *skb, __be32 net_seq)
1678 {
1679         u32 diff;
1680         u32 seq = ntohl(net_seq);
1681
1682         if (unlikely(seq == 0))
1683                 goto err;
1684
1685         if (likely(seq > x->replay.seq))
1686                 return 0;
1687
1688         diff = x->replay.seq - seq;
1689         if (diff >= min_t(unsigned int, x->props.replay_window,
1690                           sizeof(x->replay.bitmap) * 8)) {
1691                 x->stats.replay_window++;
1692                 goto err;
1693         }
1694
1695         if (x->replay.bitmap & (1U << diff)) {
1696                 x->stats.replay++;
1697                 goto err;
1698         }
1699         return 0;
1700
1701 err:
1702         xfrm_audit_state_replay(x, skb, net_seq);
1703         return -EINVAL;
1704 }
1705
1706 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq)
1707 {
1708         u32 diff;
1709         u32 seq = ntohl(net_seq);
1710
1711         if (seq > x->replay.seq) {
1712                 diff = seq - x->replay.seq;
1713                 if (diff < x->props.replay_window)
1714                         x->replay.bitmap = ((x->replay.bitmap) << diff) | 1;
1715                 else
1716                         x->replay.bitmap = 1;
1717                 x->replay.seq = seq;
1718         } else {
1719                 diff = x->replay.seq - seq;
1720                 x->replay.bitmap |= (1U << diff);
1721         }
1722
1723         if (xfrm_aevent_is_on(xs_net(x)))
1724                 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1725 }
1726
1727 static LIST_HEAD(xfrm_km_list);
1728 static DEFINE_RWLOCK(xfrm_km_lock);
1729
1730 void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
1731 {
1732         struct xfrm_mgr *km;
1733
1734         read_lock(&xfrm_km_lock);
1735         list_for_each_entry(km, &xfrm_km_list, list)
1736                 if (km->notify_policy)
1737                         km->notify_policy(xp, dir, c);
1738         read_unlock(&xfrm_km_lock);
1739 }
1740
1741 void km_state_notify(struct xfrm_state *x, struct km_event *c)
1742 {
1743         struct xfrm_mgr *km;
1744         read_lock(&xfrm_km_lock);
1745         list_for_each_entry(km, &xfrm_km_list, list)
1746                 if (km->notify)
1747                         km->notify(x, c);
1748         read_unlock(&xfrm_km_lock);
1749 }
1750
1751 EXPORT_SYMBOL(km_policy_notify);
1752 EXPORT_SYMBOL(km_state_notify);
1753
1754 void km_state_expired(struct xfrm_state *x, int hard, u32 pid)
1755 {
1756         struct net *net = xs_net(x);
1757         struct km_event c;
1758
1759         c.data.hard = hard;
1760         c.pid = pid;
1761         c.event = XFRM_MSG_EXPIRE;
1762         km_state_notify(x, &c);
1763
1764         if (hard)
1765                 wake_up(&net->xfrm.km_waitq);
1766 }
1767
1768 EXPORT_SYMBOL(km_state_expired);
1769 /*
1770  * We send to all registered managers regardless of failure
1771  * We are happy with one success
1772 */
1773 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1774 {
1775         int err = -EINVAL, acqret;
1776         struct xfrm_mgr *km;
1777
1778         read_lock(&xfrm_km_lock);
1779         list_for_each_entry(km, &xfrm_km_list, list) {
1780                 acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT);
1781                 if (!acqret)
1782                         err = acqret;
1783         }
1784         read_unlock(&xfrm_km_lock);
1785         return err;
1786 }
1787 EXPORT_SYMBOL(km_query);
1788
1789 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1790 {
1791         int err = -EINVAL;
1792         struct xfrm_mgr *km;
1793
1794         read_lock(&xfrm_km_lock);
1795         list_for_each_entry(km, &xfrm_km_list, list) {
1796                 if (km->new_mapping)
1797                         err = km->new_mapping(x, ipaddr, sport);
1798                 if (!err)
1799                         break;
1800         }
1801         read_unlock(&xfrm_km_lock);
1802         return err;
1803 }
1804 EXPORT_SYMBOL(km_new_mapping);
1805
1806 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid)
1807 {
1808         struct net *net = xp_net(pol);
1809         struct km_event c;
1810
1811         c.data.hard = hard;
1812         c.pid = pid;
1813         c.event = XFRM_MSG_POLEXPIRE;
1814         km_policy_notify(pol, dir, &c);
1815
1816         if (hard)
1817                 wake_up(&net->xfrm.km_waitq);
1818 }
1819 EXPORT_SYMBOL(km_policy_expired);
1820
1821 #ifdef CONFIG_XFRM_MIGRATE
1822 int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1823                struct xfrm_migrate *m, int num_migrate,
1824                struct xfrm_kmaddress *k)
1825 {
1826         int err = -EINVAL;
1827         int ret;
1828         struct xfrm_mgr *km;
1829
1830         read_lock(&xfrm_km_lock);
1831         list_for_each_entry(km, &xfrm_km_list, list) {
1832                 if (km->migrate) {
1833                         ret = km->migrate(sel, dir, type, m, num_migrate, k);
1834                         if (!ret)
1835                                 err = ret;
1836                 }
1837         }
1838         read_unlock(&xfrm_km_lock);
1839         return err;
1840 }
1841 EXPORT_SYMBOL(km_migrate);
1842 #endif
1843
1844 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1845 {
1846         int err = -EINVAL;
1847         int ret;
1848         struct xfrm_mgr *km;
1849
1850         read_lock(&xfrm_km_lock);
1851         list_for_each_entry(km, &xfrm_km_list, list) {
1852                 if (km->report) {
1853                         ret = km->report(net, proto, sel, addr);
1854                         if (!ret)
1855                                 err = ret;
1856                 }
1857         }
1858         read_unlock(&xfrm_km_lock);
1859         return err;
1860 }
1861 EXPORT_SYMBOL(km_report);
1862
1863 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1864 {
1865         int err;
1866         u8 *data;
1867         struct xfrm_mgr *km;
1868         struct xfrm_policy *pol = NULL;
1869
1870         if (optlen <= 0 || optlen > PAGE_SIZE)
1871                 return -EMSGSIZE;
1872
1873         data = kmalloc(optlen, GFP_KERNEL);
1874         if (!data)
1875                 return -ENOMEM;
1876
1877         err = -EFAULT;
1878         if (copy_from_user(data, optval, optlen))
1879                 goto out;
1880
1881         err = -EINVAL;
1882         read_lock(&xfrm_km_lock);
1883         list_for_each_entry(km, &xfrm_km_list, list) {
1884                 pol = km->compile_policy(sk, optname, data,
1885                                          optlen, &err);
1886                 if (err >= 0)
1887                         break;
1888         }
1889         read_unlock(&xfrm_km_lock);
1890
1891         if (err >= 0) {
1892                 xfrm_sk_policy_insert(sk, err, pol);
1893                 xfrm_pol_put(pol);
1894                 err = 0;
1895         }
1896
1897 out:
1898         kfree(data);
1899         return err;
1900 }
1901 EXPORT_SYMBOL(xfrm_user_policy);
1902
1903 int xfrm_register_km(struct xfrm_mgr *km)
1904 {
1905         write_lock_bh(&xfrm_km_lock);
1906         list_add_tail(&km->list, &xfrm_km_list);
1907         write_unlock_bh(&xfrm_km_lock);
1908         return 0;
1909 }
1910 EXPORT_SYMBOL(xfrm_register_km);
1911
1912 int xfrm_unregister_km(struct xfrm_mgr *km)
1913 {
1914         write_lock_bh(&xfrm_km_lock);
1915         list_del(&km->list);
1916         write_unlock_bh(&xfrm_km_lock);
1917         return 0;
1918 }
1919 EXPORT_SYMBOL(xfrm_unregister_km);
1920
1921 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1922 {
1923         int err = 0;
1924         if (unlikely(afinfo == NULL))
1925                 return -EINVAL;
1926         if (unlikely(afinfo->family >= NPROTO))
1927                 return -EAFNOSUPPORT;
1928         write_lock_bh(&xfrm_state_afinfo_lock);
1929         if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1930                 err = -ENOBUFS;
1931         else
1932                 xfrm_state_afinfo[afinfo->family] = afinfo;
1933         write_unlock_bh(&xfrm_state_afinfo_lock);
1934         return err;
1935 }
1936 EXPORT_SYMBOL(xfrm_state_register_afinfo);
1937
1938 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1939 {
1940         int err = 0;
1941         if (unlikely(afinfo == NULL))
1942                 return -EINVAL;
1943         if (unlikely(afinfo->family >= NPROTO))
1944                 return -EAFNOSUPPORT;
1945         write_lock_bh(&xfrm_state_afinfo_lock);
1946         if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1947                 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1948                         err = -EINVAL;
1949                 else
1950                         xfrm_state_afinfo[afinfo->family] = NULL;
1951         }
1952         write_unlock_bh(&xfrm_state_afinfo_lock);
1953         return err;
1954 }
1955 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1956
1957 static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1958 {
1959         struct xfrm_state_afinfo *afinfo;
1960         if (unlikely(family >= NPROTO))
1961                 return NULL;
1962         read_lock(&xfrm_state_afinfo_lock);
1963         afinfo = xfrm_state_afinfo[family];
1964         if (unlikely(!afinfo))
1965                 read_unlock(&xfrm_state_afinfo_lock);
1966         return afinfo;
1967 }
1968
1969 static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
1970         __releases(xfrm_state_afinfo_lock)
1971 {
1972         read_unlock(&xfrm_state_afinfo_lock);
1973 }
1974
1975 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
1976 void xfrm_state_delete_tunnel(struct xfrm_state *x)
1977 {
1978         if (x->tunnel) {
1979                 struct xfrm_state *t = x->tunnel;
1980
1981                 if (atomic_read(&t->tunnel_users) == 2)
1982                         xfrm_state_delete(t);
1983                 atomic_dec(&t->tunnel_users);
1984                 xfrm_state_put(t);
1985                 x->tunnel = NULL;
1986         }
1987 }
1988 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
1989
1990 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
1991 {
1992         int res;
1993
1994         spin_lock_bh(&x->lock);
1995         if (x->km.state == XFRM_STATE_VALID &&
1996             x->type && x->type->get_mtu)
1997                 res = x->type->get_mtu(x, mtu);
1998         else
1999                 res = mtu - x->props.header_len;
2000         spin_unlock_bh(&x->lock);
2001         return res;
2002 }
2003
2004 int xfrm_init_state(struct xfrm_state *x)
2005 {
2006         struct xfrm_state_afinfo *afinfo;
2007         struct xfrm_mode *inner_mode;
2008         int family = x->props.family;
2009         int err;
2010
2011         err = -EAFNOSUPPORT;
2012         afinfo = xfrm_state_get_afinfo(family);
2013         if (!afinfo)
2014                 goto error;
2015
2016         err = 0;
2017         if (afinfo->init_flags)
2018                 err = afinfo->init_flags(x);
2019
2020         xfrm_state_put_afinfo(afinfo);
2021
2022         if (err)
2023                 goto error;
2024
2025         err = -EPROTONOSUPPORT;
2026
2027         if (x->sel.family != AF_UNSPEC) {
2028                 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2029                 if (inner_mode == NULL)
2030                         goto error;
2031
2032                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2033                     family != x->sel.family) {
2034                         xfrm_put_mode(inner_mode);
2035                         goto error;
2036                 }
2037
2038                 x->inner_mode = inner_mode;
2039         } else {
2040                 struct xfrm_mode *inner_mode_iaf;
2041                 int iafamily = AF_INET;
2042
2043                 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2044                 if (inner_mode == NULL)
2045                         goto error;
2046
2047                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
2048                         xfrm_put_mode(inner_mode);
2049                         goto error;
2050                 }
2051                 x->inner_mode = inner_mode;
2052
2053                 if (x->props.family == AF_INET)
2054                         iafamily = AF_INET6;
2055
2056                 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2057                 if (inner_mode_iaf) {
2058                         if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2059                                 x->inner_mode_iaf = inner_mode_iaf;
2060                         else
2061                                 xfrm_put_mode(inner_mode_iaf);
2062                 }
2063         }
2064
2065         x->type = xfrm_get_type(x->id.proto, family);
2066         if (x->type == NULL)
2067                 goto error;
2068
2069         err = x->type->init_state(x);
2070         if (err)
2071                 goto error;
2072
2073         x->outer_mode = xfrm_get_mode(x->props.mode, family);
2074         if (x->outer_mode == NULL)
2075                 goto error;
2076
2077         x->km.state = XFRM_STATE_VALID;
2078
2079 error:
2080         return err;
2081 }
2082
2083 EXPORT_SYMBOL(xfrm_init_state);
2084
2085 int __net_init xfrm_state_init(struct net *net)
2086 {
2087         unsigned int sz;
2088
2089         INIT_LIST_HEAD(&net->xfrm.state_all);
2090
2091         sz = sizeof(struct hlist_head) * 8;
2092
2093         net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2094         if (!net->xfrm.state_bydst)
2095                 goto out_bydst;
2096         net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2097         if (!net->xfrm.state_bysrc)
2098                 goto out_bysrc;
2099         net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2100         if (!net->xfrm.state_byspi)
2101                 goto out_byspi;
2102         net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2103
2104         net->xfrm.state_num = 0;
2105         INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2106         INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
2107         INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
2108         init_waitqueue_head(&net->xfrm.km_waitq);
2109         return 0;
2110
2111 out_byspi:
2112         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2113 out_bysrc:
2114         xfrm_hash_free(net->xfrm.state_bydst, sz);
2115 out_bydst:
2116         return -ENOMEM;
2117 }
2118
2119 void xfrm_state_fini(struct net *net)
2120 {
2121         struct xfrm_audit audit_info;
2122         unsigned int sz;
2123
2124         flush_work(&net->xfrm.state_hash_work);
2125         audit_info.loginuid = -1;
2126         audit_info.sessionid = -1;
2127         audit_info.secid = 0;
2128         xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info);
2129         flush_work(&net->xfrm.state_gc_work);
2130
2131         WARN_ON(!list_empty(&net->xfrm.state_all));
2132
2133         sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2134         WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2135         xfrm_hash_free(net->xfrm.state_byspi, sz);
2136         WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2137         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2138         WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2139         xfrm_hash_free(net->xfrm.state_bydst, sz);
2140 }
2141
2142 #ifdef CONFIG_AUDITSYSCALL
2143 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2144                                      struct audit_buffer *audit_buf)
2145 {
2146         struct xfrm_sec_ctx *ctx = x->security;
2147         u32 spi = ntohl(x->id.spi);
2148
2149         if (ctx)
2150                 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2151                                  ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2152
2153         switch(x->props.family) {
2154         case AF_INET:
2155                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2156                                  &x->props.saddr.a4, &x->id.daddr.a4);
2157                 break;
2158         case AF_INET6:
2159                 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2160                                  x->props.saddr.a6, x->id.daddr.a6);
2161                 break;
2162         }
2163
2164         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2165 }
2166
2167 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2168                                       struct audit_buffer *audit_buf)
2169 {
2170         struct iphdr *iph4;
2171         struct ipv6hdr *iph6;
2172
2173         switch (family) {
2174         case AF_INET:
2175                 iph4 = ip_hdr(skb);
2176                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2177                                  &iph4->saddr, &iph4->daddr);
2178                 break;
2179         case AF_INET6:
2180                 iph6 = ipv6_hdr(skb);
2181                 audit_log_format(audit_buf,
2182                                  " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2183                                  &iph6->saddr,&iph6->daddr,
2184                                  iph6->flow_lbl[0] & 0x0f,
2185                                  iph6->flow_lbl[1],
2186                                  iph6->flow_lbl[2]);
2187                 break;
2188         }
2189 }
2190
2191 void xfrm_audit_state_add(struct xfrm_state *x, int result,
2192                           uid_t auid, u32 sessionid, u32 secid)
2193 {
2194         struct audit_buffer *audit_buf;
2195
2196         audit_buf = xfrm_audit_start("SAD-add");
2197         if (audit_buf == NULL)
2198                 return;
2199         xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2200         xfrm_audit_helper_sainfo(x, audit_buf);
2201         audit_log_format(audit_buf, " res=%u", result);
2202         audit_log_end(audit_buf);
2203 }
2204 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2205
2206 void xfrm_audit_state_delete(struct xfrm_state *x, int result,
2207                              uid_t auid, u32 sessionid, u32 secid)
2208 {
2209         struct audit_buffer *audit_buf;
2210
2211         audit_buf = xfrm_audit_start("SAD-delete");
2212         if (audit_buf == NULL)
2213                 return;
2214         xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2215         xfrm_audit_helper_sainfo(x, audit_buf);
2216         audit_log_format(audit_buf, " res=%u", result);
2217         audit_log_end(audit_buf);
2218 }
2219 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2220
2221 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2222                                       struct sk_buff *skb)
2223 {
2224         struct audit_buffer *audit_buf;
2225         u32 spi;
2226
2227         audit_buf = xfrm_audit_start("SA-replay-overflow");
2228         if (audit_buf == NULL)
2229                 return;
2230         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2231         /* don't record the sequence number because it's inherent in this kind
2232          * of audit message */
2233         spi = ntohl(x->id.spi);
2234         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2235         audit_log_end(audit_buf);
2236 }
2237 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2238
2239 static void xfrm_audit_state_replay(struct xfrm_state *x,
2240                              struct sk_buff *skb, __be32 net_seq)
2241 {
2242         struct audit_buffer *audit_buf;
2243         u32 spi;
2244
2245         audit_buf = xfrm_audit_start("SA-replayed-pkt");
2246         if (audit_buf == NULL)
2247                 return;
2248         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2249         spi = ntohl(x->id.spi);
2250         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2251                          spi, spi, ntohl(net_seq));
2252         audit_log_end(audit_buf);
2253 }
2254
2255 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2256 {
2257         struct audit_buffer *audit_buf;
2258
2259         audit_buf = xfrm_audit_start("SA-notfound");
2260         if (audit_buf == NULL)
2261                 return;
2262         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2263         audit_log_end(audit_buf);
2264 }
2265 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2266
2267 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2268                                __be32 net_spi, __be32 net_seq)
2269 {
2270         struct audit_buffer *audit_buf;
2271         u32 spi;
2272
2273         audit_buf = xfrm_audit_start("SA-notfound");
2274         if (audit_buf == NULL)
2275                 return;
2276         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2277         spi = ntohl(net_spi);
2278         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2279                          spi, spi, ntohl(net_seq));
2280         audit_log_end(audit_buf);
2281 }
2282 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2283
2284 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2285                               struct sk_buff *skb, u8 proto)
2286 {
2287         struct audit_buffer *audit_buf;
2288         __be32 net_spi;
2289         __be32 net_seq;
2290
2291         audit_buf = xfrm_audit_start("SA-icv-failure");
2292         if (audit_buf == NULL)
2293                 return;
2294         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2295         if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2296                 u32 spi = ntohl(net_spi);
2297                 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2298                                  spi, spi, ntohl(net_seq));
2299         }
2300         audit_log_end(audit_buf);
2301 }
2302 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2303 #endif /* CONFIG_AUDITSYSCALL */