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sctp: Enforce retransmission limit during shutdown
[deliverable/linux.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 static inline unsigned int xfrm_dst_hash(struct net *net,
46 const xfrm_address_t *daddr,
47 const xfrm_address_t *saddr,
48 u32 reqid,
49 unsigned short family)
50 {
51 return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
52 }
53
54 static inline unsigned int xfrm_src_hash(struct net *net,
55 const xfrm_address_t *daddr,
56 const xfrm_address_t *saddr,
57 unsigned short family)
58 {
59 return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
60 }
61
62 static inline unsigned int
63 xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr,
64 __be32 spi, u8 proto, unsigned short family)
65 {
66 return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
67 }
68
69 static void xfrm_hash_transfer(struct hlist_head *list,
70 struct hlist_head *ndsttable,
71 struct hlist_head *nsrctable,
72 struct hlist_head *nspitable,
73 unsigned int nhashmask)
74 {
75 struct hlist_node *entry, *tmp;
76 struct xfrm_state *x;
77
78 hlist_for_each_entry_safe(x, entry, tmp, list, bydst) {
79 unsigned int h;
80
81 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
82 x->props.reqid, x->props.family,
83 nhashmask);
84 hlist_add_head(&x->bydst, ndsttable+h);
85
86 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
87 x->props.family,
88 nhashmask);
89 hlist_add_head(&x->bysrc, nsrctable+h);
90
91 if (x->id.spi) {
92 h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
93 x->id.proto, x->props.family,
94 nhashmask);
95 hlist_add_head(&x->byspi, nspitable+h);
96 }
97 }
98 }
99
100 static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
101 {
102 return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
103 }
104
105 static DEFINE_MUTEX(hash_resize_mutex);
106
107 static void xfrm_hash_resize(struct work_struct *work)
108 {
109 struct net *net = container_of(work, struct net, xfrm.state_hash_work);
110 struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
111 unsigned long nsize, osize;
112 unsigned int nhashmask, ohashmask;
113 int i;
114
115 mutex_lock(&hash_resize_mutex);
116
117 nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
118 ndst = xfrm_hash_alloc(nsize);
119 if (!ndst)
120 goto out_unlock;
121 nsrc = xfrm_hash_alloc(nsize);
122 if (!nsrc) {
123 xfrm_hash_free(ndst, nsize);
124 goto out_unlock;
125 }
126 nspi = xfrm_hash_alloc(nsize);
127 if (!nspi) {
128 xfrm_hash_free(ndst, nsize);
129 xfrm_hash_free(nsrc, nsize);
130 goto out_unlock;
131 }
132
133 spin_lock_bh(&xfrm_state_lock);
134
135 nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
136 for (i = net->xfrm.state_hmask; i >= 0; i--)
137 xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi,
138 nhashmask);
139
140 odst = net->xfrm.state_bydst;
141 osrc = net->xfrm.state_bysrc;
142 ospi = net->xfrm.state_byspi;
143 ohashmask = net->xfrm.state_hmask;
144
145 net->xfrm.state_bydst = ndst;
146 net->xfrm.state_bysrc = nsrc;
147 net->xfrm.state_byspi = nspi;
148 net->xfrm.state_hmask = nhashmask;
149
150 spin_unlock_bh(&xfrm_state_lock);
151
152 osize = (ohashmask + 1) * sizeof(struct hlist_head);
153 xfrm_hash_free(odst, osize);
154 xfrm_hash_free(osrc, osize);
155 xfrm_hash_free(ospi, osize);
156
157 out_unlock:
158 mutex_unlock(&hash_resize_mutex);
159 }
160
161 static DEFINE_RWLOCK(xfrm_state_afinfo_lock);
162 static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO];
163
164 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
165
166 int __xfrm_state_delete(struct xfrm_state *x);
167
168 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
169 void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
170
171 static struct xfrm_state_afinfo *xfrm_state_lock_afinfo(unsigned int family)
172 {
173 struct xfrm_state_afinfo *afinfo;
174 if (unlikely(family >= NPROTO))
175 return NULL;
176 write_lock_bh(&xfrm_state_afinfo_lock);
177 afinfo = xfrm_state_afinfo[family];
178 if (unlikely(!afinfo))
179 write_unlock_bh(&xfrm_state_afinfo_lock);
180 return afinfo;
181 }
182
183 static void xfrm_state_unlock_afinfo(struct xfrm_state_afinfo *afinfo)
184 __releases(xfrm_state_afinfo_lock)
185 {
186 write_unlock_bh(&xfrm_state_afinfo_lock);
187 }
188
189 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
190 {
191 struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family);
192 const struct xfrm_type **typemap;
193 int err = 0;
194
195 if (unlikely(afinfo == NULL))
196 return -EAFNOSUPPORT;
197 typemap = afinfo->type_map;
198
199 if (likely(typemap[type->proto] == NULL))
200 typemap[type->proto] = type;
201 else
202 err = -EEXIST;
203 xfrm_state_unlock_afinfo(afinfo);
204 return err;
205 }
206 EXPORT_SYMBOL(xfrm_register_type);
207
208 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
209 {
210 struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family);
211 const struct xfrm_type **typemap;
212 int err = 0;
213
214 if (unlikely(afinfo == NULL))
215 return -EAFNOSUPPORT;
216 typemap = afinfo->type_map;
217
218 if (unlikely(typemap[type->proto] != type))
219 err = -ENOENT;
220 else
221 typemap[type->proto] = NULL;
222 xfrm_state_unlock_afinfo(afinfo);
223 return err;
224 }
225 EXPORT_SYMBOL(xfrm_unregister_type);
226
227 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
228 {
229 struct xfrm_state_afinfo *afinfo;
230 const struct xfrm_type **typemap;
231 const struct xfrm_type *type;
232 int modload_attempted = 0;
233
234 retry:
235 afinfo = xfrm_state_get_afinfo(family);
236 if (unlikely(afinfo == NULL))
237 return NULL;
238 typemap = afinfo->type_map;
239
240 type = typemap[proto];
241 if (unlikely(type && !try_module_get(type->owner)))
242 type = NULL;
243 if (!type && !modload_attempted) {
244 xfrm_state_put_afinfo(afinfo);
245 request_module("xfrm-type-%d-%d", family, proto);
246 modload_attempted = 1;
247 goto retry;
248 }
249
250 xfrm_state_put_afinfo(afinfo);
251 return type;
252 }
253
254 static void xfrm_put_type(const struct xfrm_type *type)
255 {
256 module_put(type->owner);
257 }
258
259 int xfrm_register_mode(struct xfrm_mode *mode, int family)
260 {
261 struct xfrm_state_afinfo *afinfo;
262 struct xfrm_mode **modemap;
263 int err;
264
265 if (unlikely(mode->encap >= XFRM_MODE_MAX))
266 return -EINVAL;
267
268 afinfo = xfrm_state_lock_afinfo(family);
269 if (unlikely(afinfo == NULL))
270 return -EAFNOSUPPORT;
271
272 err = -EEXIST;
273 modemap = afinfo->mode_map;
274 if (modemap[mode->encap])
275 goto out;
276
277 err = -ENOENT;
278 if (!try_module_get(afinfo->owner))
279 goto out;
280
281 mode->afinfo = afinfo;
282 modemap[mode->encap] = mode;
283 err = 0;
284
285 out:
286 xfrm_state_unlock_afinfo(afinfo);
287 return err;
288 }
289 EXPORT_SYMBOL(xfrm_register_mode);
290
291 int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
292 {
293 struct xfrm_state_afinfo *afinfo;
294 struct xfrm_mode **modemap;
295 int err;
296
297 if (unlikely(mode->encap >= XFRM_MODE_MAX))
298 return -EINVAL;
299
300 afinfo = xfrm_state_lock_afinfo(family);
301 if (unlikely(afinfo == NULL))
302 return -EAFNOSUPPORT;
303
304 err = -ENOENT;
305 modemap = afinfo->mode_map;
306 if (likely(modemap[mode->encap] == mode)) {
307 modemap[mode->encap] = NULL;
308 module_put(mode->afinfo->owner);
309 err = 0;
310 }
311
312 xfrm_state_unlock_afinfo(afinfo);
313 return err;
314 }
315 EXPORT_SYMBOL(xfrm_unregister_mode);
316
317 static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
318 {
319 struct xfrm_state_afinfo *afinfo;
320 struct xfrm_mode *mode;
321 int modload_attempted = 0;
322
323 if (unlikely(encap >= XFRM_MODE_MAX))
324 return NULL;
325
326 retry:
327 afinfo = xfrm_state_get_afinfo(family);
328 if (unlikely(afinfo == NULL))
329 return NULL;
330
331 mode = afinfo->mode_map[encap];
332 if (unlikely(mode && !try_module_get(mode->owner)))
333 mode = NULL;
334 if (!mode && !modload_attempted) {
335 xfrm_state_put_afinfo(afinfo);
336 request_module("xfrm-mode-%d-%d", family, encap);
337 modload_attempted = 1;
338 goto retry;
339 }
340
341 xfrm_state_put_afinfo(afinfo);
342 return mode;
343 }
344
345 static void xfrm_put_mode(struct xfrm_mode *mode)
346 {
347 module_put(mode->owner);
348 }
349
350 static void xfrm_state_gc_destroy(struct xfrm_state *x)
351 {
352 tasklet_hrtimer_cancel(&x->mtimer);
353 del_timer_sync(&x->rtimer);
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 net *net = container_of(work, struct net, xfrm.state_gc_work);
378 struct xfrm_state *x;
379 struct hlist_node *entry, *tmp;
380 struct hlist_head gc_list;
381
382 spin_lock_bh(&xfrm_state_gc_lock);
383 hlist_move_list(&net->xfrm.state_gc_list, &gc_list);
384 spin_unlock_bh(&xfrm_state_gc_lock);
385
386 hlist_for_each_entry_safe(x, entry, tmp, &gc_list, gclist)
387 xfrm_state_gc_destroy(x);
388
389 wake_up(&net->xfrm.km_waitq);
390 }
391
392 static inline unsigned long make_jiffies(long secs)
393 {
394 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
395 return MAX_SCHEDULE_TIMEOUT-1;
396 else
397 return secs*HZ;
398 }
399
400 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer * me)
401 {
402 struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
403 struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
404 struct net *net = xs_net(x);
405 unsigned long now = get_seconds();
406 long next = LONG_MAX;
407 int warn = 0;
408 int err = 0;
409
410 spin_lock(&x->lock);
411 if (x->km.state == XFRM_STATE_DEAD)
412 goto out;
413 if (x->km.state == XFRM_STATE_EXPIRED)
414 goto expired;
415 if (x->lft.hard_add_expires_seconds) {
416 long tmo = x->lft.hard_add_expires_seconds +
417 x->curlft.add_time - now;
418 if (tmo <= 0)
419 goto expired;
420 if (tmo < next)
421 next = tmo;
422 }
423 if (x->lft.hard_use_expires_seconds) {
424 long tmo = x->lft.hard_use_expires_seconds +
425 (x->curlft.use_time ? : now) - now;
426 if (tmo <= 0)
427 goto expired;
428 if (tmo < next)
429 next = tmo;
430 }
431 if (x->km.dying)
432 goto resched;
433 if (x->lft.soft_add_expires_seconds) {
434 long tmo = x->lft.soft_add_expires_seconds +
435 x->curlft.add_time - now;
436 if (tmo <= 0)
437 warn = 1;
438 else if (tmo < next)
439 next = tmo;
440 }
441 if (x->lft.soft_use_expires_seconds) {
442 long tmo = x->lft.soft_use_expires_seconds +
443 (x->curlft.use_time ? : now) - now;
444 if (tmo <= 0)
445 warn = 1;
446 else if (tmo < next)
447 next = tmo;
448 }
449
450 x->km.dying = warn;
451 if (warn)
452 km_state_expired(x, 0, 0);
453 resched:
454 if (next != LONG_MAX){
455 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
456 }
457
458 goto out;
459
460 expired:
461 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) {
462 x->km.state = XFRM_STATE_EXPIRED;
463 wake_up(&net->xfrm.km_waitq);
464 next = 2;
465 goto resched;
466 }
467
468 err = __xfrm_state_delete(x);
469 if (!err && x->id.spi)
470 km_state_expired(x, 1, 0);
471
472 xfrm_audit_state_delete(x, err ? 0 : 1,
473 audit_get_loginuid(current),
474 audit_get_sessionid(current), 0);
475
476 out:
477 spin_unlock(&x->lock);
478 return HRTIMER_NORESTART;
479 }
480
481 static void xfrm_replay_timer_handler(unsigned long data);
482
483 struct xfrm_state *xfrm_state_alloc(struct net *net)
484 {
485 struct xfrm_state *x;
486
487 x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
488
489 if (x) {
490 write_pnet(&x->xs_net, net);
491 atomic_set(&x->refcnt, 1);
492 atomic_set(&x->tunnel_users, 0);
493 INIT_LIST_HEAD(&x->km.all);
494 INIT_HLIST_NODE(&x->bydst);
495 INIT_HLIST_NODE(&x->bysrc);
496 INIT_HLIST_NODE(&x->byspi);
497 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler, CLOCK_REALTIME, HRTIMER_MODE_ABS);
498 setup_timer(&x->rtimer, xfrm_replay_timer_handler,
499 (unsigned long)x);
500 x->curlft.add_time = get_seconds();
501 x->lft.soft_byte_limit = XFRM_INF;
502 x->lft.soft_packet_limit = XFRM_INF;
503 x->lft.hard_byte_limit = XFRM_INF;
504 x->lft.hard_packet_limit = XFRM_INF;
505 x->replay_maxage = 0;
506 x->replay_maxdiff = 0;
507 x->inner_mode = NULL;
508 x->inner_mode_iaf = NULL;
509 spin_lock_init(&x->lock);
510 }
511 return x;
512 }
513 EXPORT_SYMBOL(xfrm_state_alloc);
514
515 void __xfrm_state_destroy(struct xfrm_state *x)
516 {
517 struct net *net = xs_net(x);
518
519 WARN_ON(x->km.state != XFRM_STATE_DEAD);
520
521 spin_lock_bh(&xfrm_state_gc_lock);
522 hlist_add_head(&x->gclist, &net->xfrm.state_gc_list);
523 spin_unlock_bh(&xfrm_state_gc_lock);
524 schedule_work(&net->xfrm.state_gc_work);
525 }
526 EXPORT_SYMBOL(__xfrm_state_destroy);
527
528 int __xfrm_state_delete(struct xfrm_state *x)
529 {
530 struct net *net = xs_net(x);
531 int err = -ESRCH;
532
533 if (x->km.state != XFRM_STATE_DEAD) {
534 x->km.state = XFRM_STATE_DEAD;
535 spin_lock(&xfrm_state_lock);
536 list_del(&x->km.all);
537 hlist_del(&x->bydst);
538 hlist_del(&x->bysrc);
539 if (x->id.spi)
540 hlist_del(&x->byspi);
541 net->xfrm.state_num--;
542 spin_unlock(&xfrm_state_lock);
543
544 /* All xfrm_state objects are created by xfrm_state_alloc.
545 * The xfrm_state_alloc call gives a reference, and that
546 * is what we are dropping here.
547 */
548 xfrm_state_put(x);
549 err = 0;
550 }
551
552 return err;
553 }
554 EXPORT_SYMBOL(__xfrm_state_delete);
555
556 int xfrm_state_delete(struct xfrm_state *x)
557 {
558 int err;
559
560 spin_lock_bh(&x->lock);
561 err = __xfrm_state_delete(x);
562 spin_unlock_bh(&x->lock);
563
564 return err;
565 }
566 EXPORT_SYMBOL(xfrm_state_delete);
567
568 #ifdef CONFIG_SECURITY_NETWORK_XFRM
569 static inline int
570 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
571 {
572 int i, err = 0;
573
574 for (i = 0; i <= net->xfrm.state_hmask; i++) {
575 struct hlist_node *entry;
576 struct xfrm_state *x;
577
578 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
579 if (xfrm_id_proto_match(x->id.proto, proto) &&
580 (err = security_xfrm_state_delete(x)) != 0) {
581 xfrm_audit_state_delete(x, 0,
582 audit_info->loginuid,
583 audit_info->sessionid,
584 audit_info->secid);
585 return err;
586 }
587 }
588 }
589
590 return err;
591 }
592 #else
593 static inline int
594 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
595 {
596 return 0;
597 }
598 #endif
599
600 int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info)
601 {
602 int i, err = 0, cnt = 0;
603
604 spin_lock_bh(&xfrm_state_lock);
605 err = xfrm_state_flush_secctx_check(net, proto, audit_info);
606 if (err)
607 goto out;
608
609 err = -ESRCH;
610 for (i = 0; i <= net->xfrm.state_hmask; i++) {
611 struct hlist_node *entry;
612 struct xfrm_state *x;
613 restart:
614 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
615 if (!xfrm_state_kern(x) &&
616 xfrm_id_proto_match(x->id.proto, proto)) {
617 xfrm_state_hold(x);
618 spin_unlock_bh(&xfrm_state_lock);
619
620 err = xfrm_state_delete(x);
621 xfrm_audit_state_delete(x, err ? 0 : 1,
622 audit_info->loginuid,
623 audit_info->sessionid,
624 audit_info->secid);
625 xfrm_state_put(x);
626 if (!err)
627 cnt++;
628
629 spin_lock_bh(&xfrm_state_lock);
630 goto restart;
631 }
632 }
633 }
634 if (cnt)
635 err = 0;
636
637 out:
638 spin_unlock_bh(&xfrm_state_lock);
639 wake_up(&net->xfrm.km_waitq);
640 return err;
641 }
642 EXPORT_SYMBOL(xfrm_state_flush);
643
644 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
645 {
646 spin_lock_bh(&xfrm_state_lock);
647 si->sadcnt = net->xfrm.state_num;
648 si->sadhcnt = net->xfrm.state_hmask;
649 si->sadhmcnt = xfrm_state_hashmax;
650 spin_unlock_bh(&xfrm_state_lock);
651 }
652 EXPORT_SYMBOL(xfrm_sad_getinfo);
653
654 static int
655 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
656 const struct xfrm_tmpl *tmpl,
657 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
658 unsigned short family)
659 {
660 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
661 if (!afinfo)
662 return -1;
663 afinfo->init_tempsel(&x->sel, fl);
664
665 if (family != tmpl->encap_family) {
666 xfrm_state_put_afinfo(afinfo);
667 afinfo = xfrm_state_get_afinfo(tmpl->encap_family);
668 if (!afinfo)
669 return -1;
670 }
671 afinfo->init_temprop(x, tmpl, daddr, saddr);
672 xfrm_state_put_afinfo(afinfo);
673 return 0;
674 }
675
676 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
677 const xfrm_address_t *daddr,
678 __be32 spi, u8 proto,
679 unsigned short family)
680 {
681 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
682 struct xfrm_state *x;
683 struct hlist_node *entry;
684
685 hlist_for_each_entry(x, entry, net->xfrm.state_byspi+h, byspi) {
686 if (x->props.family != family ||
687 x->id.spi != spi ||
688 x->id.proto != proto ||
689 xfrm_addr_cmp(&x->id.daddr, daddr, family))
690 continue;
691
692 if ((mark & x->mark.m) != x->mark.v)
693 continue;
694 xfrm_state_hold(x);
695 return x;
696 }
697
698 return NULL;
699 }
700
701 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
702 const xfrm_address_t *daddr,
703 const xfrm_address_t *saddr,
704 u8 proto, unsigned short family)
705 {
706 unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
707 struct xfrm_state *x;
708 struct hlist_node *entry;
709
710 hlist_for_each_entry(x, entry, net->xfrm.state_bysrc+h, bysrc) {
711 if (x->props.family != family ||
712 x->id.proto != proto ||
713 xfrm_addr_cmp(&x->id.daddr, daddr, family) ||
714 xfrm_addr_cmp(&x->props.saddr, saddr, family))
715 continue;
716
717 if ((mark & x->mark.m) != x->mark.v)
718 continue;
719 xfrm_state_hold(x);
720 return x;
721 }
722
723 return NULL;
724 }
725
726 static inline struct xfrm_state *
727 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
728 {
729 struct net *net = xs_net(x);
730 u32 mark = x->mark.v & x->mark.m;
731
732 if (use_spi)
733 return __xfrm_state_lookup(net, mark, &x->id.daddr,
734 x->id.spi, x->id.proto, family);
735 else
736 return __xfrm_state_lookup_byaddr(net, mark,
737 &x->id.daddr,
738 &x->props.saddr,
739 x->id.proto, family);
740 }
741
742 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
743 {
744 if (have_hash_collision &&
745 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
746 net->xfrm.state_num > net->xfrm.state_hmask)
747 schedule_work(&net->xfrm.state_hash_work);
748 }
749
750 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
751 const struct flowi *fl, unsigned short family,
752 struct xfrm_state **best, int *acq_in_progress,
753 int *error)
754 {
755 /* Resolution logic:
756 * 1. There is a valid state with matching selector. Done.
757 * 2. Valid state with inappropriate selector. Skip.
758 *
759 * Entering area of "sysdeps".
760 *
761 * 3. If state is not valid, selector is temporary, it selects
762 * only session which triggered previous resolution. Key
763 * manager will do something to install a state with proper
764 * selector.
765 */
766 if (x->km.state == XFRM_STATE_VALID) {
767 if ((x->sel.family &&
768 !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
769 !security_xfrm_state_pol_flow_match(x, pol, fl))
770 return;
771
772 if (!*best ||
773 (*best)->km.dying > x->km.dying ||
774 ((*best)->km.dying == x->km.dying &&
775 (*best)->curlft.add_time < x->curlft.add_time))
776 *best = x;
777 } else if (x->km.state == XFRM_STATE_ACQ) {
778 *acq_in_progress = 1;
779 } else if (x->km.state == XFRM_STATE_ERROR ||
780 x->km.state == XFRM_STATE_EXPIRED) {
781 if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
782 security_xfrm_state_pol_flow_match(x, pol, fl))
783 *error = -ESRCH;
784 }
785 }
786
787 struct xfrm_state *
788 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
789 const struct flowi *fl, struct xfrm_tmpl *tmpl,
790 struct xfrm_policy *pol, int *err,
791 unsigned short family)
792 {
793 static xfrm_address_t saddr_wildcard = { };
794 struct net *net = xp_net(pol);
795 unsigned int h, h_wildcard;
796 struct hlist_node *entry;
797 struct xfrm_state *x, *x0, *to_put;
798 int acquire_in_progress = 0;
799 int error = 0;
800 struct xfrm_state *best = NULL;
801 u32 mark = pol->mark.v & pol->mark.m;
802 unsigned short encap_family = tmpl->encap_family;
803
804 to_put = NULL;
805
806 spin_lock_bh(&xfrm_state_lock);
807 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
808 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
809 if (x->props.family == encap_family &&
810 x->props.reqid == tmpl->reqid &&
811 (mark & x->mark.m) == x->mark.v &&
812 !(x->props.flags & XFRM_STATE_WILDRECV) &&
813 xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
814 tmpl->mode == x->props.mode &&
815 tmpl->id.proto == x->id.proto &&
816 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
817 xfrm_state_look_at(pol, x, fl, encap_family,
818 &best, &acquire_in_progress, &error);
819 }
820 if (best)
821 goto found;
822
823 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
824 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h_wildcard, bydst) {
825 if (x->props.family == encap_family &&
826 x->props.reqid == tmpl->reqid &&
827 (mark & x->mark.m) == x->mark.v &&
828 !(x->props.flags & XFRM_STATE_WILDRECV) &&
829 xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
830 tmpl->mode == x->props.mode &&
831 tmpl->id.proto == x->id.proto &&
832 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
833 xfrm_state_look_at(pol, x, fl, encap_family,
834 &best, &acquire_in_progress, &error);
835 }
836
837 found:
838 x = best;
839 if (!x && !error && !acquire_in_progress) {
840 if (tmpl->id.spi &&
841 (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
842 tmpl->id.proto, encap_family)) != NULL) {
843 to_put = x0;
844 error = -EEXIST;
845 goto out;
846 }
847 x = xfrm_state_alloc(net);
848 if (x == NULL) {
849 error = -ENOMEM;
850 goto out;
851 }
852 /* Initialize temporary state matching only
853 * to current session. */
854 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
855 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
856
857 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
858 if (error) {
859 x->km.state = XFRM_STATE_DEAD;
860 to_put = x;
861 x = NULL;
862 goto out;
863 }
864
865 if (km_query(x, tmpl, pol) == 0) {
866 x->km.state = XFRM_STATE_ACQ;
867 list_add(&x->km.all, &net->xfrm.state_all);
868 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
869 h = xfrm_src_hash(net, daddr, saddr, encap_family);
870 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
871 if (x->id.spi) {
872 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
873 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
874 }
875 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
876 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
877 net->xfrm.state_num++;
878 xfrm_hash_grow_check(net, x->bydst.next != NULL);
879 } else {
880 x->km.state = XFRM_STATE_DEAD;
881 to_put = x;
882 x = NULL;
883 error = -ESRCH;
884 }
885 }
886 out:
887 if (x)
888 xfrm_state_hold(x);
889 else
890 *err = acquire_in_progress ? -EAGAIN : error;
891 spin_unlock_bh(&xfrm_state_lock);
892 if (to_put)
893 xfrm_state_put(to_put);
894 return x;
895 }
896
897 struct xfrm_state *
898 xfrm_stateonly_find(struct net *net, u32 mark,
899 xfrm_address_t *daddr, xfrm_address_t *saddr,
900 unsigned short family, u8 mode, u8 proto, u32 reqid)
901 {
902 unsigned int h;
903 struct xfrm_state *rx = NULL, *x = NULL;
904 struct hlist_node *entry;
905
906 spin_lock(&xfrm_state_lock);
907 h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
908 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
909 if (x->props.family == family &&
910 x->props.reqid == reqid &&
911 (mark & x->mark.m) == x->mark.v &&
912 !(x->props.flags & XFRM_STATE_WILDRECV) &&
913 xfrm_state_addr_check(x, daddr, saddr, family) &&
914 mode == x->props.mode &&
915 proto == x->id.proto &&
916 x->km.state == XFRM_STATE_VALID) {
917 rx = x;
918 break;
919 }
920 }
921
922 if (rx)
923 xfrm_state_hold(rx);
924 spin_unlock(&xfrm_state_lock);
925
926
927 return rx;
928 }
929 EXPORT_SYMBOL(xfrm_stateonly_find);
930
931 static void __xfrm_state_insert(struct xfrm_state *x)
932 {
933 struct net *net = xs_net(x);
934 unsigned int h;
935
936 list_add(&x->km.all, &net->xfrm.state_all);
937
938 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
939 x->props.reqid, x->props.family);
940 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
941
942 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
943 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
944
945 if (x->id.spi) {
946 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
947 x->props.family);
948
949 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
950 }
951
952 tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
953 if (x->replay_maxage)
954 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
955
956 wake_up(&net->xfrm.km_waitq);
957
958 net->xfrm.state_num++;
959
960 xfrm_hash_grow_check(net, x->bydst.next != NULL);
961 }
962
963 /* xfrm_state_lock is held */
964 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
965 {
966 struct net *net = xs_net(xnew);
967 unsigned short family = xnew->props.family;
968 u32 reqid = xnew->props.reqid;
969 struct xfrm_state *x;
970 struct hlist_node *entry;
971 unsigned int h;
972 u32 mark = xnew->mark.v & xnew->mark.m;
973
974 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
975 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
976 if (x->props.family == family &&
977 x->props.reqid == reqid &&
978 (mark & x->mark.m) == x->mark.v &&
979 !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) &&
980 !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family))
981 x->genid++;
982 }
983 }
984
985 void xfrm_state_insert(struct xfrm_state *x)
986 {
987 spin_lock_bh(&xfrm_state_lock);
988 __xfrm_state_bump_genids(x);
989 __xfrm_state_insert(x);
990 spin_unlock_bh(&xfrm_state_lock);
991 }
992 EXPORT_SYMBOL(xfrm_state_insert);
993
994 /* xfrm_state_lock is held */
995 static struct xfrm_state *__find_acq_core(struct net *net, struct xfrm_mark *m,
996 unsigned short family, u8 mode,
997 u32 reqid, u8 proto,
998 const xfrm_address_t *daddr,
999 const xfrm_address_t *saddr, int create)
1000 {
1001 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1002 struct hlist_node *entry;
1003 struct xfrm_state *x;
1004 u32 mark = m->v & m->m;
1005
1006 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
1007 if (x->props.reqid != reqid ||
1008 x->props.mode != mode ||
1009 x->props.family != family ||
1010 x->km.state != XFRM_STATE_ACQ ||
1011 x->id.spi != 0 ||
1012 x->id.proto != proto ||
1013 (mark & x->mark.m) != x->mark.v ||
1014 xfrm_addr_cmp(&x->id.daddr, daddr, family) ||
1015 xfrm_addr_cmp(&x->props.saddr, saddr, family))
1016 continue;
1017
1018 xfrm_state_hold(x);
1019 return x;
1020 }
1021
1022 if (!create)
1023 return NULL;
1024
1025 x = xfrm_state_alloc(net);
1026 if (likely(x)) {
1027 switch (family) {
1028 case AF_INET:
1029 x->sel.daddr.a4 = daddr->a4;
1030 x->sel.saddr.a4 = saddr->a4;
1031 x->sel.prefixlen_d = 32;
1032 x->sel.prefixlen_s = 32;
1033 x->props.saddr.a4 = saddr->a4;
1034 x->id.daddr.a4 = daddr->a4;
1035 break;
1036
1037 case AF_INET6:
1038 ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6,
1039 (const struct in6_addr *)daddr);
1040 ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6,
1041 (const struct in6_addr *)saddr);
1042 x->sel.prefixlen_d = 128;
1043 x->sel.prefixlen_s = 128;
1044 ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6,
1045 (const struct in6_addr *)saddr);
1046 ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6,
1047 (const struct in6_addr *)daddr);
1048 break;
1049 }
1050
1051 x->km.state = XFRM_STATE_ACQ;
1052 x->id.proto = proto;
1053 x->props.family = family;
1054 x->props.mode = mode;
1055 x->props.reqid = reqid;
1056 x->mark.v = m->v;
1057 x->mark.m = m->m;
1058 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1059 xfrm_state_hold(x);
1060 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1061 list_add(&x->km.all, &net->xfrm.state_all);
1062 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
1063 h = xfrm_src_hash(net, daddr, saddr, family);
1064 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
1065
1066 net->xfrm.state_num++;
1067
1068 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1069 }
1070
1071 return x;
1072 }
1073
1074 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1075
1076 int xfrm_state_add(struct xfrm_state *x)
1077 {
1078 struct net *net = xs_net(x);
1079 struct xfrm_state *x1, *to_put;
1080 int family;
1081 int err;
1082 u32 mark = x->mark.v & x->mark.m;
1083 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1084
1085 family = x->props.family;
1086
1087 to_put = NULL;
1088
1089 spin_lock_bh(&xfrm_state_lock);
1090
1091 x1 = __xfrm_state_locate(x, use_spi, family);
1092 if (x1) {
1093 to_put = x1;
1094 x1 = NULL;
1095 err = -EEXIST;
1096 goto out;
1097 }
1098
1099 if (use_spi && x->km.seq) {
1100 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1101 if (x1 && ((x1->id.proto != x->id.proto) ||
1102 xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family))) {
1103 to_put = x1;
1104 x1 = NULL;
1105 }
1106 }
1107
1108 if (use_spi && !x1)
1109 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1110 x->props.reqid, x->id.proto,
1111 &x->id.daddr, &x->props.saddr, 0);
1112
1113 __xfrm_state_bump_genids(x);
1114 __xfrm_state_insert(x);
1115 err = 0;
1116
1117 out:
1118 spin_unlock_bh(&xfrm_state_lock);
1119
1120 if (x1) {
1121 xfrm_state_delete(x1);
1122 xfrm_state_put(x1);
1123 }
1124
1125 if (to_put)
1126 xfrm_state_put(to_put);
1127
1128 return err;
1129 }
1130 EXPORT_SYMBOL(xfrm_state_add);
1131
1132 #ifdef CONFIG_XFRM_MIGRATE
1133 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp)
1134 {
1135 struct net *net = xs_net(orig);
1136 int err = -ENOMEM;
1137 struct xfrm_state *x = xfrm_state_alloc(net);
1138 if (!x)
1139 goto out;
1140
1141 memcpy(&x->id, &orig->id, sizeof(x->id));
1142 memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1143 memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1144 x->props.mode = orig->props.mode;
1145 x->props.replay_window = orig->props.replay_window;
1146 x->props.reqid = orig->props.reqid;
1147 x->props.family = orig->props.family;
1148 x->props.saddr = orig->props.saddr;
1149
1150 if (orig->aalg) {
1151 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1152 if (!x->aalg)
1153 goto error;
1154 }
1155 x->props.aalgo = orig->props.aalgo;
1156
1157 if (orig->ealg) {
1158 x->ealg = xfrm_algo_clone(orig->ealg);
1159 if (!x->ealg)
1160 goto error;
1161 }
1162 x->props.ealgo = orig->props.ealgo;
1163
1164 if (orig->calg) {
1165 x->calg = xfrm_algo_clone(orig->calg);
1166 if (!x->calg)
1167 goto error;
1168 }
1169 x->props.calgo = orig->props.calgo;
1170
1171 if (orig->encap) {
1172 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
1173 if (!x->encap)
1174 goto error;
1175 }
1176
1177 if (orig->coaddr) {
1178 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1179 GFP_KERNEL);
1180 if (!x->coaddr)
1181 goto error;
1182 }
1183
1184 if (orig->replay_esn) {
1185 err = xfrm_replay_clone(x, orig);
1186 if (err)
1187 goto error;
1188 }
1189
1190 memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1191
1192 err = xfrm_init_state(x);
1193 if (err)
1194 goto error;
1195
1196 x->props.flags = orig->props.flags;
1197
1198 x->curlft.add_time = orig->curlft.add_time;
1199 x->km.state = orig->km.state;
1200 x->km.seq = orig->km.seq;
1201
1202 return x;
1203
1204 error:
1205 xfrm_state_put(x);
1206 out:
1207 if (errp)
1208 *errp = err;
1209 return NULL;
1210 }
1211
1212 /* xfrm_state_lock is held */
1213 struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m)
1214 {
1215 unsigned int h;
1216 struct xfrm_state *x;
1217 struct hlist_node *entry;
1218
1219 if (m->reqid) {
1220 h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr,
1221 m->reqid, m->old_family);
1222 hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) {
1223 if (x->props.mode != m->mode ||
1224 x->id.proto != m->proto)
1225 continue;
1226 if (m->reqid && x->props.reqid != m->reqid)
1227 continue;
1228 if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr,
1229 m->old_family) ||
1230 xfrm_addr_cmp(&x->props.saddr, &m->old_saddr,
1231 m->old_family))
1232 continue;
1233 xfrm_state_hold(x);
1234 return x;
1235 }
1236 } else {
1237 h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr,
1238 m->old_family);
1239 hlist_for_each_entry(x, entry, init_net.xfrm.state_bysrc+h, bysrc) {
1240 if (x->props.mode != m->mode ||
1241 x->id.proto != m->proto)
1242 continue;
1243 if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr,
1244 m->old_family) ||
1245 xfrm_addr_cmp(&x->props.saddr, &m->old_saddr,
1246 m->old_family))
1247 continue;
1248 xfrm_state_hold(x);
1249 return x;
1250 }
1251 }
1252
1253 return NULL;
1254 }
1255 EXPORT_SYMBOL(xfrm_migrate_state_find);
1256
1257 struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1258 struct xfrm_migrate *m)
1259 {
1260 struct xfrm_state *xc;
1261 int err;
1262
1263 xc = xfrm_state_clone(x, &err);
1264 if (!xc)
1265 return NULL;
1266
1267 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1268 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1269
1270 /* add state */
1271 if (!xfrm_addr_cmp(&x->id.daddr, &m->new_daddr, m->new_family)) {
1272 /* a care is needed when the destination address of the
1273 state is to be updated as it is a part of triplet */
1274 xfrm_state_insert(xc);
1275 } else {
1276 if ((err = xfrm_state_add(xc)) < 0)
1277 goto error;
1278 }
1279
1280 return xc;
1281 error:
1282 xfrm_state_put(xc);
1283 return NULL;
1284 }
1285 EXPORT_SYMBOL(xfrm_state_migrate);
1286 #endif
1287
1288 int xfrm_state_update(struct xfrm_state *x)
1289 {
1290 struct xfrm_state *x1, *to_put;
1291 int err;
1292 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1293
1294 to_put = NULL;
1295
1296 spin_lock_bh(&xfrm_state_lock);
1297 x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1298
1299 err = -ESRCH;
1300 if (!x1)
1301 goto out;
1302
1303 if (xfrm_state_kern(x1)) {
1304 to_put = x1;
1305 err = -EEXIST;
1306 goto out;
1307 }
1308
1309 if (x1->km.state == XFRM_STATE_ACQ) {
1310 __xfrm_state_insert(x);
1311 x = NULL;
1312 }
1313 err = 0;
1314
1315 out:
1316 spin_unlock_bh(&xfrm_state_lock);
1317
1318 if (to_put)
1319 xfrm_state_put(to_put);
1320
1321 if (err)
1322 return err;
1323
1324 if (!x) {
1325 xfrm_state_delete(x1);
1326 xfrm_state_put(x1);
1327 return 0;
1328 }
1329
1330 err = -EINVAL;
1331 spin_lock_bh(&x1->lock);
1332 if (likely(x1->km.state == XFRM_STATE_VALID)) {
1333 if (x->encap && x1->encap)
1334 memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1335 if (x->coaddr && x1->coaddr) {
1336 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1337 }
1338 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1339 memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1340 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1341 x1->km.dying = 0;
1342
1343 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1344 if (x1->curlft.use_time)
1345 xfrm_state_check_expire(x1);
1346
1347 err = 0;
1348 }
1349 spin_unlock_bh(&x1->lock);
1350
1351 xfrm_state_put(x1);
1352
1353 return err;
1354 }
1355 EXPORT_SYMBOL(xfrm_state_update);
1356
1357 int xfrm_state_check_expire(struct xfrm_state *x)
1358 {
1359 if (!x->curlft.use_time)
1360 x->curlft.use_time = get_seconds();
1361
1362 if (x->km.state != XFRM_STATE_VALID)
1363 return -EINVAL;
1364
1365 if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1366 x->curlft.packets >= x->lft.hard_packet_limit) {
1367 x->km.state = XFRM_STATE_EXPIRED;
1368 tasklet_hrtimer_start(&x->mtimer, ktime_set(0,0), HRTIMER_MODE_REL);
1369 return -EINVAL;
1370 }
1371
1372 if (!x->km.dying &&
1373 (x->curlft.bytes >= x->lft.soft_byte_limit ||
1374 x->curlft.packets >= x->lft.soft_packet_limit)) {
1375 x->km.dying = 1;
1376 km_state_expired(x, 0, 0);
1377 }
1378 return 0;
1379 }
1380 EXPORT_SYMBOL(xfrm_state_check_expire);
1381
1382 struct xfrm_state *
1383 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1384 u8 proto, unsigned short family)
1385 {
1386 struct xfrm_state *x;
1387
1388 spin_lock_bh(&xfrm_state_lock);
1389 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1390 spin_unlock_bh(&xfrm_state_lock);
1391 return x;
1392 }
1393 EXPORT_SYMBOL(xfrm_state_lookup);
1394
1395 struct xfrm_state *
1396 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1397 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1398 u8 proto, unsigned short family)
1399 {
1400 struct xfrm_state *x;
1401
1402 spin_lock_bh(&xfrm_state_lock);
1403 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1404 spin_unlock_bh(&xfrm_state_lock);
1405 return x;
1406 }
1407 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1408
1409 struct xfrm_state *
1410 xfrm_find_acq(struct net *net, struct xfrm_mark *mark, u8 mode, u32 reqid, u8 proto,
1411 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1412 int create, unsigned short family)
1413 {
1414 struct xfrm_state *x;
1415
1416 spin_lock_bh(&xfrm_state_lock);
1417 x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create);
1418 spin_unlock_bh(&xfrm_state_lock);
1419
1420 return x;
1421 }
1422 EXPORT_SYMBOL(xfrm_find_acq);
1423
1424 #ifdef CONFIG_XFRM_SUB_POLICY
1425 int
1426 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1427 unsigned short family)
1428 {
1429 int err = 0;
1430 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1431 if (!afinfo)
1432 return -EAFNOSUPPORT;
1433
1434 spin_lock_bh(&xfrm_state_lock);
1435 if (afinfo->tmpl_sort)
1436 err = afinfo->tmpl_sort(dst, src, n);
1437 spin_unlock_bh(&xfrm_state_lock);
1438 xfrm_state_put_afinfo(afinfo);
1439 return err;
1440 }
1441 EXPORT_SYMBOL(xfrm_tmpl_sort);
1442
1443 int
1444 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1445 unsigned short family)
1446 {
1447 int err = 0;
1448 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1449 if (!afinfo)
1450 return -EAFNOSUPPORT;
1451
1452 spin_lock_bh(&xfrm_state_lock);
1453 if (afinfo->state_sort)
1454 err = afinfo->state_sort(dst, src, n);
1455 spin_unlock_bh(&xfrm_state_lock);
1456 xfrm_state_put_afinfo(afinfo);
1457 return err;
1458 }
1459 EXPORT_SYMBOL(xfrm_state_sort);
1460 #endif
1461
1462 /* Silly enough, but I'm lazy to build resolution list */
1463
1464 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1465 {
1466 int i;
1467
1468 for (i = 0; i <= net->xfrm.state_hmask; i++) {
1469 struct hlist_node *entry;
1470 struct xfrm_state *x;
1471
1472 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
1473 if (x->km.seq == seq &&
1474 (mark & x->mark.m) == x->mark.v &&
1475 x->km.state == XFRM_STATE_ACQ) {
1476 xfrm_state_hold(x);
1477 return x;
1478 }
1479 }
1480 }
1481 return NULL;
1482 }
1483
1484 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1485 {
1486 struct xfrm_state *x;
1487
1488 spin_lock_bh(&xfrm_state_lock);
1489 x = __xfrm_find_acq_byseq(net, mark, seq);
1490 spin_unlock_bh(&xfrm_state_lock);
1491 return x;
1492 }
1493 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1494
1495 u32 xfrm_get_acqseq(void)
1496 {
1497 u32 res;
1498 static atomic_t acqseq;
1499
1500 do {
1501 res = atomic_inc_return(&acqseq);
1502 } while (!res);
1503
1504 return res;
1505 }
1506 EXPORT_SYMBOL(xfrm_get_acqseq);
1507
1508 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1509 {
1510 struct net *net = xs_net(x);
1511 unsigned int h;
1512 struct xfrm_state *x0;
1513 int err = -ENOENT;
1514 __be32 minspi = htonl(low);
1515 __be32 maxspi = htonl(high);
1516 u32 mark = x->mark.v & x->mark.m;
1517
1518 spin_lock_bh(&x->lock);
1519 if (x->km.state == XFRM_STATE_DEAD)
1520 goto unlock;
1521
1522 err = 0;
1523 if (x->id.spi)
1524 goto unlock;
1525
1526 err = -ENOENT;
1527
1528 if (minspi == maxspi) {
1529 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1530 if (x0) {
1531 xfrm_state_put(x0);
1532 goto unlock;
1533 }
1534 x->id.spi = minspi;
1535 } else {
1536 u32 spi = 0;
1537 for (h=0; h<high-low+1; h++) {
1538 spi = low + net_random()%(high-low+1);
1539 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1540 if (x0 == NULL) {
1541 x->id.spi = htonl(spi);
1542 break;
1543 }
1544 xfrm_state_put(x0);
1545 }
1546 }
1547 if (x->id.spi) {
1548 spin_lock_bh(&xfrm_state_lock);
1549 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1550 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
1551 spin_unlock_bh(&xfrm_state_lock);
1552
1553 err = 0;
1554 }
1555
1556 unlock:
1557 spin_unlock_bh(&x->lock);
1558
1559 return err;
1560 }
1561 EXPORT_SYMBOL(xfrm_alloc_spi);
1562
1563 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1564 int (*func)(struct xfrm_state *, int, void*),
1565 void *data)
1566 {
1567 struct xfrm_state *state;
1568 struct xfrm_state_walk *x;
1569 int err = 0;
1570
1571 if (walk->seq != 0 && list_empty(&walk->all))
1572 return 0;
1573
1574 spin_lock_bh(&xfrm_state_lock);
1575 if (list_empty(&walk->all))
1576 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1577 else
1578 x = list_entry(&walk->all, struct xfrm_state_walk, all);
1579 list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1580 if (x->state == XFRM_STATE_DEAD)
1581 continue;
1582 state = container_of(x, struct xfrm_state, km);
1583 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1584 continue;
1585 err = func(state, walk->seq, data);
1586 if (err) {
1587 list_move_tail(&walk->all, &x->all);
1588 goto out;
1589 }
1590 walk->seq++;
1591 }
1592 if (walk->seq == 0) {
1593 err = -ENOENT;
1594 goto out;
1595 }
1596 list_del_init(&walk->all);
1597 out:
1598 spin_unlock_bh(&xfrm_state_lock);
1599 return err;
1600 }
1601 EXPORT_SYMBOL(xfrm_state_walk);
1602
1603 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto)
1604 {
1605 INIT_LIST_HEAD(&walk->all);
1606 walk->proto = proto;
1607 walk->state = XFRM_STATE_DEAD;
1608 walk->seq = 0;
1609 }
1610 EXPORT_SYMBOL(xfrm_state_walk_init);
1611
1612 void xfrm_state_walk_done(struct xfrm_state_walk *walk)
1613 {
1614 if (list_empty(&walk->all))
1615 return;
1616
1617 spin_lock_bh(&xfrm_state_lock);
1618 list_del(&walk->all);
1619 spin_unlock_bh(&xfrm_state_lock);
1620 }
1621 EXPORT_SYMBOL(xfrm_state_walk_done);
1622
1623 static void xfrm_replay_timer_handler(unsigned long data)
1624 {
1625 struct xfrm_state *x = (struct xfrm_state*)data;
1626
1627 spin_lock(&x->lock);
1628
1629 if (x->km.state == XFRM_STATE_VALID) {
1630 if (xfrm_aevent_is_on(xs_net(x)))
1631 x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
1632 else
1633 x->xflags |= XFRM_TIME_DEFER;
1634 }
1635
1636 spin_unlock(&x->lock);
1637 }
1638
1639 static LIST_HEAD(xfrm_km_list);
1640 static DEFINE_RWLOCK(xfrm_km_lock);
1641
1642 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1643 {
1644 struct xfrm_mgr *km;
1645
1646 read_lock(&xfrm_km_lock);
1647 list_for_each_entry(km, &xfrm_km_list, list)
1648 if (km->notify_policy)
1649 km->notify_policy(xp, dir, c);
1650 read_unlock(&xfrm_km_lock);
1651 }
1652
1653 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
1654 {
1655 struct xfrm_mgr *km;
1656 read_lock(&xfrm_km_lock);
1657 list_for_each_entry(km, &xfrm_km_list, list)
1658 if (km->notify)
1659 km->notify(x, c);
1660 read_unlock(&xfrm_km_lock);
1661 }
1662
1663 EXPORT_SYMBOL(km_policy_notify);
1664 EXPORT_SYMBOL(km_state_notify);
1665
1666 void km_state_expired(struct xfrm_state *x, int hard, u32 pid)
1667 {
1668 struct net *net = xs_net(x);
1669 struct km_event c;
1670
1671 c.data.hard = hard;
1672 c.pid = pid;
1673 c.event = XFRM_MSG_EXPIRE;
1674 km_state_notify(x, &c);
1675
1676 if (hard)
1677 wake_up(&net->xfrm.km_waitq);
1678 }
1679
1680 EXPORT_SYMBOL(km_state_expired);
1681 /*
1682 * We send to all registered managers regardless of failure
1683 * We are happy with one success
1684 */
1685 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1686 {
1687 int err = -EINVAL, acqret;
1688 struct xfrm_mgr *km;
1689
1690 read_lock(&xfrm_km_lock);
1691 list_for_each_entry(km, &xfrm_km_list, list) {
1692 acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT);
1693 if (!acqret)
1694 err = acqret;
1695 }
1696 read_unlock(&xfrm_km_lock);
1697 return err;
1698 }
1699 EXPORT_SYMBOL(km_query);
1700
1701 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1702 {
1703 int err = -EINVAL;
1704 struct xfrm_mgr *km;
1705
1706 read_lock(&xfrm_km_lock);
1707 list_for_each_entry(km, &xfrm_km_list, list) {
1708 if (km->new_mapping)
1709 err = km->new_mapping(x, ipaddr, sport);
1710 if (!err)
1711 break;
1712 }
1713 read_unlock(&xfrm_km_lock);
1714 return err;
1715 }
1716 EXPORT_SYMBOL(km_new_mapping);
1717
1718 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid)
1719 {
1720 struct net *net = xp_net(pol);
1721 struct km_event c;
1722
1723 c.data.hard = hard;
1724 c.pid = pid;
1725 c.event = XFRM_MSG_POLEXPIRE;
1726 km_policy_notify(pol, dir, &c);
1727
1728 if (hard)
1729 wake_up(&net->xfrm.km_waitq);
1730 }
1731 EXPORT_SYMBOL(km_policy_expired);
1732
1733 #ifdef CONFIG_XFRM_MIGRATE
1734 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1735 const struct xfrm_migrate *m, int num_migrate,
1736 const struct xfrm_kmaddress *k)
1737 {
1738 int err = -EINVAL;
1739 int ret;
1740 struct xfrm_mgr *km;
1741
1742 read_lock(&xfrm_km_lock);
1743 list_for_each_entry(km, &xfrm_km_list, list) {
1744 if (km->migrate) {
1745 ret = km->migrate(sel, dir, type, m, num_migrate, k);
1746 if (!ret)
1747 err = ret;
1748 }
1749 }
1750 read_unlock(&xfrm_km_lock);
1751 return err;
1752 }
1753 EXPORT_SYMBOL(km_migrate);
1754 #endif
1755
1756 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1757 {
1758 int err = -EINVAL;
1759 int ret;
1760 struct xfrm_mgr *km;
1761
1762 read_lock(&xfrm_km_lock);
1763 list_for_each_entry(km, &xfrm_km_list, list) {
1764 if (km->report) {
1765 ret = km->report(net, proto, sel, addr);
1766 if (!ret)
1767 err = ret;
1768 }
1769 }
1770 read_unlock(&xfrm_km_lock);
1771 return err;
1772 }
1773 EXPORT_SYMBOL(km_report);
1774
1775 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1776 {
1777 int err;
1778 u8 *data;
1779 struct xfrm_mgr *km;
1780 struct xfrm_policy *pol = NULL;
1781
1782 if (optlen <= 0 || optlen > PAGE_SIZE)
1783 return -EMSGSIZE;
1784
1785 data = kmalloc(optlen, GFP_KERNEL);
1786 if (!data)
1787 return -ENOMEM;
1788
1789 err = -EFAULT;
1790 if (copy_from_user(data, optval, optlen))
1791 goto out;
1792
1793 err = -EINVAL;
1794 read_lock(&xfrm_km_lock);
1795 list_for_each_entry(km, &xfrm_km_list, list) {
1796 pol = km->compile_policy(sk, optname, data,
1797 optlen, &err);
1798 if (err >= 0)
1799 break;
1800 }
1801 read_unlock(&xfrm_km_lock);
1802
1803 if (err >= 0) {
1804 xfrm_sk_policy_insert(sk, err, pol);
1805 xfrm_pol_put(pol);
1806 err = 0;
1807 }
1808
1809 out:
1810 kfree(data);
1811 return err;
1812 }
1813 EXPORT_SYMBOL(xfrm_user_policy);
1814
1815 int xfrm_register_km(struct xfrm_mgr *km)
1816 {
1817 write_lock_bh(&xfrm_km_lock);
1818 list_add_tail(&km->list, &xfrm_km_list);
1819 write_unlock_bh(&xfrm_km_lock);
1820 return 0;
1821 }
1822 EXPORT_SYMBOL(xfrm_register_km);
1823
1824 int xfrm_unregister_km(struct xfrm_mgr *km)
1825 {
1826 write_lock_bh(&xfrm_km_lock);
1827 list_del(&km->list);
1828 write_unlock_bh(&xfrm_km_lock);
1829 return 0;
1830 }
1831 EXPORT_SYMBOL(xfrm_unregister_km);
1832
1833 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1834 {
1835 int err = 0;
1836 if (unlikely(afinfo == NULL))
1837 return -EINVAL;
1838 if (unlikely(afinfo->family >= NPROTO))
1839 return -EAFNOSUPPORT;
1840 write_lock_bh(&xfrm_state_afinfo_lock);
1841 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1842 err = -ENOBUFS;
1843 else
1844 xfrm_state_afinfo[afinfo->family] = afinfo;
1845 write_unlock_bh(&xfrm_state_afinfo_lock);
1846 return err;
1847 }
1848 EXPORT_SYMBOL(xfrm_state_register_afinfo);
1849
1850 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1851 {
1852 int err = 0;
1853 if (unlikely(afinfo == NULL))
1854 return -EINVAL;
1855 if (unlikely(afinfo->family >= NPROTO))
1856 return -EAFNOSUPPORT;
1857 write_lock_bh(&xfrm_state_afinfo_lock);
1858 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1859 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1860 err = -EINVAL;
1861 else
1862 xfrm_state_afinfo[afinfo->family] = NULL;
1863 }
1864 write_unlock_bh(&xfrm_state_afinfo_lock);
1865 return err;
1866 }
1867 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1868
1869 static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1870 {
1871 struct xfrm_state_afinfo *afinfo;
1872 if (unlikely(family >= NPROTO))
1873 return NULL;
1874 read_lock(&xfrm_state_afinfo_lock);
1875 afinfo = xfrm_state_afinfo[family];
1876 if (unlikely(!afinfo))
1877 read_unlock(&xfrm_state_afinfo_lock);
1878 return afinfo;
1879 }
1880
1881 static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
1882 __releases(xfrm_state_afinfo_lock)
1883 {
1884 read_unlock(&xfrm_state_afinfo_lock);
1885 }
1886
1887 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
1888 void xfrm_state_delete_tunnel(struct xfrm_state *x)
1889 {
1890 if (x->tunnel) {
1891 struct xfrm_state *t = x->tunnel;
1892
1893 if (atomic_read(&t->tunnel_users) == 2)
1894 xfrm_state_delete(t);
1895 atomic_dec(&t->tunnel_users);
1896 xfrm_state_put(t);
1897 x->tunnel = NULL;
1898 }
1899 }
1900 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
1901
1902 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
1903 {
1904 int res;
1905
1906 spin_lock_bh(&x->lock);
1907 if (x->km.state == XFRM_STATE_VALID &&
1908 x->type && x->type->get_mtu)
1909 res = x->type->get_mtu(x, mtu);
1910 else
1911 res = mtu - x->props.header_len;
1912 spin_unlock_bh(&x->lock);
1913 return res;
1914 }
1915
1916 int __xfrm_init_state(struct xfrm_state *x, bool init_replay)
1917 {
1918 struct xfrm_state_afinfo *afinfo;
1919 struct xfrm_mode *inner_mode;
1920 int family = x->props.family;
1921 int err;
1922
1923 err = -EAFNOSUPPORT;
1924 afinfo = xfrm_state_get_afinfo(family);
1925 if (!afinfo)
1926 goto error;
1927
1928 err = 0;
1929 if (afinfo->init_flags)
1930 err = afinfo->init_flags(x);
1931
1932 xfrm_state_put_afinfo(afinfo);
1933
1934 if (err)
1935 goto error;
1936
1937 err = -EPROTONOSUPPORT;
1938
1939 if (x->sel.family != AF_UNSPEC) {
1940 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
1941 if (inner_mode == NULL)
1942 goto error;
1943
1944 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
1945 family != x->sel.family) {
1946 xfrm_put_mode(inner_mode);
1947 goto error;
1948 }
1949
1950 x->inner_mode = inner_mode;
1951 } else {
1952 struct xfrm_mode *inner_mode_iaf;
1953 int iafamily = AF_INET;
1954
1955 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
1956 if (inner_mode == NULL)
1957 goto error;
1958
1959 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
1960 xfrm_put_mode(inner_mode);
1961 goto error;
1962 }
1963 x->inner_mode = inner_mode;
1964
1965 if (x->props.family == AF_INET)
1966 iafamily = AF_INET6;
1967
1968 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
1969 if (inner_mode_iaf) {
1970 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
1971 x->inner_mode_iaf = inner_mode_iaf;
1972 else
1973 xfrm_put_mode(inner_mode_iaf);
1974 }
1975 }
1976
1977 x->type = xfrm_get_type(x->id.proto, family);
1978 if (x->type == NULL)
1979 goto error;
1980
1981 err = x->type->init_state(x);
1982 if (err)
1983 goto error;
1984
1985 x->outer_mode = xfrm_get_mode(x->props.mode, family);
1986 if (x->outer_mode == NULL)
1987 goto error;
1988
1989 if (init_replay) {
1990 err = xfrm_init_replay(x);
1991 if (err)
1992 goto error;
1993 }
1994
1995 x->km.state = XFRM_STATE_VALID;
1996
1997 error:
1998 return err;
1999 }
2000
2001 EXPORT_SYMBOL(__xfrm_init_state);
2002
2003 int xfrm_init_state(struct xfrm_state *x)
2004 {
2005 return __xfrm_init_state(x, true);
2006 }
2007
2008 EXPORT_SYMBOL(xfrm_init_state);
2009
2010 int __net_init xfrm_state_init(struct net *net)
2011 {
2012 unsigned int sz;
2013
2014 INIT_LIST_HEAD(&net->xfrm.state_all);
2015
2016 sz = sizeof(struct hlist_head) * 8;
2017
2018 net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2019 if (!net->xfrm.state_bydst)
2020 goto out_bydst;
2021 net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2022 if (!net->xfrm.state_bysrc)
2023 goto out_bysrc;
2024 net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2025 if (!net->xfrm.state_byspi)
2026 goto out_byspi;
2027 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2028
2029 net->xfrm.state_num = 0;
2030 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2031 INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
2032 INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
2033 init_waitqueue_head(&net->xfrm.km_waitq);
2034 return 0;
2035
2036 out_byspi:
2037 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2038 out_bysrc:
2039 xfrm_hash_free(net->xfrm.state_bydst, sz);
2040 out_bydst:
2041 return -ENOMEM;
2042 }
2043
2044 void xfrm_state_fini(struct net *net)
2045 {
2046 struct xfrm_audit audit_info;
2047 unsigned int sz;
2048
2049 flush_work(&net->xfrm.state_hash_work);
2050 audit_info.loginuid = -1;
2051 audit_info.sessionid = -1;
2052 audit_info.secid = 0;
2053 xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info);
2054 flush_work(&net->xfrm.state_gc_work);
2055
2056 WARN_ON(!list_empty(&net->xfrm.state_all));
2057
2058 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2059 WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2060 xfrm_hash_free(net->xfrm.state_byspi, sz);
2061 WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2062 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2063 WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2064 xfrm_hash_free(net->xfrm.state_bydst, sz);
2065 }
2066
2067 #ifdef CONFIG_AUDITSYSCALL
2068 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2069 struct audit_buffer *audit_buf)
2070 {
2071 struct xfrm_sec_ctx *ctx = x->security;
2072 u32 spi = ntohl(x->id.spi);
2073
2074 if (ctx)
2075 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2076 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2077
2078 switch(x->props.family) {
2079 case AF_INET:
2080 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2081 &x->props.saddr.a4, &x->id.daddr.a4);
2082 break;
2083 case AF_INET6:
2084 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2085 x->props.saddr.a6, x->id.daddr.a6);
2086 break;
2087 }
2088
2089 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2090 }
2091
2092 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2093 struct audit_buffer *audit_buf)
2094 {
2095 const struct iphdr *iph4;
2096 const struct ipv6hdr *iph6;
2097
2098 switch (family) {
2099 case AF_INET:
2100 iph4 = ip_hdr(skb);
2101 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2102 &iph4->saddr, &iph4->daddr);
2103 break;
2104 case AF_INET6:
2105 iph6 = ipv6_hdr(skb);
2106 audit_log_format(audit_buf,
2107 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2108 &iph6->saddr,&iph6->daddr,
2109 iph6->flow_lbl[0] & 0x0f,
2110 iph6->flow_lbl[1],
2111 iph6->flow_lbl[2]);
2112 break;
2113 }
2114 }
2115
2116 void xfrm_audit_state_add(struct xfrm_state *x, int result,
2117 uid_t auid, u32 sessionid, u32 secid)
2118 {
2119 struct audit_buffer *audit_buf;
2120
2121 audit_buf = xfrm_audit_start("SAD-add");
2122 if (audit_buf == NULL)
2123 return;
2124 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2125 xfrm_audit_helper_sainfo(x, audit_buf);
2126 audit_log_format(audit_buf, " res=%u", result);
2127 audit_log_end(audit_buf);
2128 }
2129 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2130
2131 void xfrm_audit_state_delete(struct xfrm_state *x, int result,
2132 uid_t auid, u32 sessionid, u32 secid)
2133 {
2134 struct audit_buffer *audit_buf;
2135
2136 audit_buf = xfrm_audit_start("SAD-delete");
2137 if (audit_buf == NULL)
2138 return;
2139 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2140 xfrm_audit_helper_sainfo(x, audit_buf);
2141 audit_log_format(audit_buf, " res=%u", result);
2142 audit_log_end(audit_buf);
2143 }
2144 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2145
2146 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2147 struct sk_buff *skb)
2148 {
2149 struct audit_buffer *audit_buf;
2150 u32 spi;
2151
2152 audit_buf = xfrm_audit_start("SA-replay-overflow");
2153 if (audit_buf == NULL)
2154 return;
2155 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2156 /* don't record the sequence number because it's inherent in this kind
2157 * of audit message */
2158 spi = ntohl(x->id.spi);
2159 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2160 audit_log_end(audit_buf);
2161 }
2162 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2163
2164 void xfrm_audit_state_replay(struct xfrm_state *x,
2165 struct sk_buff *skb, __be32 net_seq)
2166 {
2167 struct audit_buffer *audit_buf;
2168 u32 spi;
2169
2170 audit_buf = xfrm_audit_start("SA-replayed-pkt");
2171 if (audit_buf == NULL)
2172 return;
2173 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2174 spi = ntohl(x->id.spi);
2175 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2176 spi, spi, ntohl(net_seq));
2177 audit_log_end(audit_buf);
2178 }
2179 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2180
2181 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2182 {
2183 struct audit_buffer *audit_buf;
2184
2185 audit_buf = xfrm_audit_start("SA-notfound");
2186 if (audit_buf == NULL)
2187 return;
2188 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2189 audit_log_end(audit_buf);
2190 }
2191 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2192
2193 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2194 __be32 net_spi, __be32 net_seq)
2195 {
2196 struct audit_buffer *audit_buf;
2197 u32 spi;
2198
2199 audit_buf = xfrm_audit_start("SA-notfound");
2200 if (audit_buf == NULL)
2201 return;
2202 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2203 spi = ntohl(net_spi);
2204 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2205 spi, spi, ntohl(net_seq));
2206 audit_log_end(audit_buf);
2207 }
2208 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2209
2210 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2211 struct sk_buff *skb, u8 proto)
2212 {
2213 struct audit_buffer *audit_buf;
2214 __be32 net_spi;
2215 __be32 net_seq;
2216
2217 audit_buf = xfrm_audit_start("SA-icv-failure");
2218 if (audit_buf == NULL)
2219 return;
2220 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2221 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2222 u32 spi = ntohl(net_spi);
2223 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2224 spi, spi, ntohl(net_seq));
2225 }
2226 audit_log_end(audit_buf);
2227 }
2228 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2229 #endif /* CONFIG_AUDITSYSCALL */
Linux kernel - Deliverables
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