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[XFRM]: xfrm_larval_drop sysctl should be __read_mostly.
[linux-2.6/linux-2.6-openrd.git] / net / xfrm / xfrm_policy.c
blob64a375178c5f28b2b4adb61ed9a76a62a9e15a09
1 /*
2 * xfrm_policy.c
3 *
4 * Changes:
5 * Mitsuru KANDA @USAGI
6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
8 * IPv6 support
9 * Kazunori MIYAZAWA @USAGI
10 * YOSHIFUJI Hideaki
11 * Split up af-specific portion
12 * Derek Atkins <derek@ihtfp.com> Add the post_input processor
13 *
14 */
15
16 #include <linux/slab.h>
17 #include <linux/kmod.h>
18 #include <linux/list.h>
19 #include <linux/spinlock.h>
20 #include <linux/workqueue.h>
21 #include <linux/notifier.h>
22 #include <linux/netdevice.h>
23 #include <linux/netfilter.h>
24 #include <linux/module.h>
25 #include <linux/cache.h>
26 #include <net/xfrm.h>
27 #include <net/ip.h>
28 #include <linux/audit.h>
29 #include <linux/cache.h>
30
31 #include "xfrm_hash.h"
32
33 int sysctl_xfrm_larval_drop __read_mostly;
34
35 DEFINE_MUTEX(xfrm_cfg_mutex);
36 EXPORT_SYMBOL(xfrm_cfg_mutex);
37
38 static DEFINE_RWLOCK(xfrm_policy_lock);
39
40 unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
41 EXPORT_SYMBOL(xfrm_policy_count);
42
43 static DEFINE_RWLOCK(xfrm_policy_afinfo_lock);
44 static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO];
45
46 static struct kmem_cache *xfrm_dst_cache __read_mostly;
47
48 static struct work_struct xfrm_policy_gc_work;
49 static HLIST_HEAD(xfrm_policy_gc_list);
50 static DEFINE_SPINLOCK(xfrm_policy_gc_lock);
51
52 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family);
53 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo);
54 static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family);
55 static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo);
56
57 static inline int
58 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
59 {
60 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
61 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
62 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
63 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
64 (fl->proto == sel->proto || !sel->proto) &&
65 (fl->oif == sel->ifindex || !sel->ifindex);
66 }
67
68 static inline int
69 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
70 {
71 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
72 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
73 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
74 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
75 (fl->proto == sel->proto || !sel->proto) &&
76 (fl->oif == sel->ifindex || !sel->ifindex);
77 }
78
79 int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
80 unsigned short family)
81 {
82 switch (family) {
83 case AF_INET:
84 return __xfrm4_selector_match(sel, fl);
85 case AF_INET6:
86 return __xfrm6_selector_match(sel, fl);
87 }
88 return 0;
89 }
90
91 int xfrm_register_type(struct xfrm_type *type, unsigned short family)
92 {
93 struct xfrm_policy_afinfo *afinfo = xfrm_policy_lock_afinfo(family);
94 struct xfrm_type **typemap;
95 int err = 0;
96
97 if (unlikely(afinfo == NULL))
98 return -EAFNOSUPPORT;
99 typemap = afinfo->type_map;
100
101 if (likely(typemap[type->proto] == NULL))
102 typemap[type->proto] = type;
103 else
104 err = -EEXIST;
105 xfrm_policy_unlock_afinfo(afinfo);
106 return err;
107 }
108 EXPORT_SYMBOL(xfrm_register_type);
109
110 int xfrm_unregister_type(struct xfrm_type *type, unsigned short family)
111 {
112 struct xfrm_policy_afinfo *afinfo = xfrm_policy_lock_afinfo(family);
113 struct xfrm_type **typemap;
114 int err = 0;
115
116 if (unlikely(afinfo == NULL))
117 return -EAFNOSUPPORT;
118 typemap = afinfo->type_map;
119
120 if (unlikely(typemap[type->proto] != type))
121 err = -ENOENT;
122 else
123 typemap[type->proto] = NULL;
124 xfrm_policy_unlock_afinfo(afinfo);
125 return err;
126 }
127 EXPORT_SYMBOL(xfrm_unregister_type);
128
129 struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
130 {
131 struct xfrm_policy_afinfo *afinfo;
132 struct xfrm_type **typemap;
133 struct xfrm_type *type;
134 int modload_attempted = 0;
135
136 retry:
137 afinfo = xfrm_policy_get_afinfo(family);
138 if (unlikely(afinfo == NULL))
139 return NULL;
140 typemap = afinfo->type_map;
141
142 type = typemap[proto];
143 if (unlikely(type && !try_module_get(type->owner)))
144 type = NULL;
145 if (!type && !modload_attempted) {
146 xfrm_policy_put_afinfo(afinfo);
147 request_module("xfrm-type-%d-%d",
148 (int) family, (int) proto);
149 modload_attempted = 1;
150 goto retry;
151 }
152
153 xfrm_policy_put_afinfo(afinfo);
154 return type;
155 }
156
157 int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl,
158 unsigned short family)
159 {
160 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
161 int err = 0;
162
163 if (unlikely(afinfo == NULL))
164 return -EAFNOSUPPORT;
165
166 if (likely(afinfo->dst_lookup != NULL))
167 err = afinfo->dst_lookup(dst, fl);
168 else
169 err = -EINVAL;
170 xfrm_policy_put_afinfo(afinfo);
171 return err;
172 }
173 EXPORT_SYMBOL(xfrm_dst_lookup);
174
175 void xfrm_put_type(struct xfrm_type *type)
176 {
177 module_put(type->owner);
178 }
179
180 int xfrm_register_mode(struct xfrm_mode *mode, int family)
181 {
182 struct xfrm_policy_afinfo *afinfo;
183 struct xfrm_mode **modemap;
184 int err;
185
186 if (unlikely(mode->encap >= XFRM_MODE_MAX))
187 return -EINVAL;
188
189 afinfo = xfrm_policy_lock_afinfo(family);
190 if (unlikely(afinfo == NULL))
191 return -EAFNOSUPPORT;
192
193 err = -EEXIST;
194 modemap = afinfo->mode_map;
195 if (likely(modemap[mode->encap] == NULL)) {
196 modemap[mode->encap] = mode;
197 err = 0;
198 }
199
200 xfrm_policy_unlock_afinfo(afinfo);
201 return err;
202 }
203 EXPORT_SYMBOL(xfrm_register_mode);
204
205 int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
206 {
207 struct xfrm_policy_afinfo *afinfo;
208 struct xfrm_mode **modemap;
209 int err;
210
211 if (unlikely(mode->encap >= XFRM_MODE_MAX))
212 return -EINVAL;
213
214 afinfo = xfrm_policy_lock_afinfo(family);
215 if (unlikely(afinfo == NULL))
216 return -EAFNOSUPPORT;
217
218 err = -ENOENT;
219 modemap = afinfo->mode_map;
220 if (likely(modemap[mode->encap] == mode)) {
221 modemap[mode->encap] = NULL;
222 err = 0;
223 }
224
225 xfrm_policy_unlock_afinfo(afinfo);
226 return err;
227 }
228 EXPORT_SYMBOL(xfrm_unregister_mode);
229
230 struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
231 {
232 struct xfrm_policy_afinfo *afinfo;
233 struct xfrm_mode *mode;
234 int modload_attempted = 0;
235
236 if (unlikely(encap >= XFRM_MODE_MAX))
237 return NULL;
238
239 retry:
240 afinfo = xfrm_policy_get_afinfo(family);
241 if (unlikely(afinfo == NULL))
242 return NULL;
243
244 mode = afinfo->mode_map[encap];
245 if (unlikely(mode && !try_module_get(mode->owner)))
246 mode = NULL;
247 if (!mode && !modload_attempted) {
248 xfrm_policy_put_afinfo(afinfo);
249 request_module("xfrm-mode-%d-%d", family, encap);
250 modload_attempted = 1;
251 goto retry;
252 }
253
254 xfrm_policy_put_afinfo(afinfo);
255 return mode;
256 }
257
258 void xfrm_put_mode(struct xfrm_mode *mode)
259 {
260 module_put(mode->owner);
261 }
262
263 static inline unsigned long make_jiffies(long secs)
264 {
265 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
266 return MAX_SCHEDULE_TIMEOUT-1;
267 else
268 return secs*HZ;
269 }
270
271 static void xfrm_policy_timer(unsigned long data)
272 {
273 struct xfrm_policy *xp = (struct xfrm_policy*)data;
274 unsigned long now = get_seconds();
275 long next = LONG_MAX;
276 int warn = 0;
277 int dir;
278
279 read_lock(&xp->lock);
280
281 if (xp->dead)
282 goto out;
283
284 dir = xfrm_policy_id2dir(xp->index);
285
286 if (xp->lft.hard_add_expires_seconds) {
287 long tmo = xp->lft.hard_add_expires_seconds +
288 xp->curlft.add_time - now;
289 if (tmo <= 0)
290 goto expired;
291 if (tmo < next)
292 next = tmo;
293 }
294 if (xp->lft.hard_use_expires_seconds) {
295 long tmo = xp->lft.hard_use_expires_seconds +
296 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
297 if (tmo <= 0)
298 goto expired;
299 if (tmo < next)
300 next = tmo;
301 }
302 if (xp->lft.soft_add_expires_seconds) {
303 long tmo = xp->lft.soft_add_expires_seconds +
304 xp->curlft.add_time - now;
305 if (tmo <= 0) {
306 warn = 1;
307 tmo = XFRM_KM_TIMEOUT;
308 }
309 if (tmo < next)
310 next = tmo;
311 }
312 if (xp->lft.soft_use_expires_seconds) {
313 long tmo = xp->lft.soft_use_expires_seconds +
314 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
315 if (tmo <= 0) {
316 warn = 1;
317 tmo = XFRM_KM_TIMEOUT;
318 }
319 if (tmo < next)
320 next = tmo;
321 }
322
323 if (warn)
324 km_policy_expired(xp, dir, 0, 0);
325 if (next != LONG_MAX &&
326 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
327 xfrm_pol_hold(xp);
328
329 out:
330 read_unlock(&xp->lock);
331 xfrm_pol_put(xp);
332 return;
333
334 expired:
335 read_unlock(&xp->lock);
336 if (!xfrm_policy_delete(xp, dir))
337 km_policy_expired(xp, dir, 1, 0);
338 xfrm_pol_put(xp);
339 }
340
341
342 /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
343 * SPD calls.
344 */
345
346 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp)
347 {
348 struct xfrm_policy *policy;
349
350 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
351
352 if (policy) {
353 INIT_HLIST_NODE(&policy->bydst);
354 INIT_HLIST_NODE(&policy->byidx);
355 rwlock_init(&policy->lock);
356 atomic_set(&policy->refcnt, 1);
357 init_timer(&policy->timer);
358 policy->timer.data = (unsigned long)policy;
359 policy->timer.function = xfrm_policy_timer;
360 }
361 return policy;
362 }
363 EXPORT_SYMBOL(xfrm_policy_alloc);
364
365 /* Destroy xfrm_policy: descendant resources must be released to this moment. */
366
367 void __xfrm_policy_destroy(struct xfrm_policy *policy)
368 {
369 BUG_ON(!policy->dead);
370
371 BUG_ON(policy->bundles);
372
373 if (del_timer(&policy->timer))
374 BUG();
375
376 security_xfrm_policy_free(policy);
377 kfree(policy);
378 }
379 EXPORT_SYMBOL(__xfrm_policy_destroy);
380
381 static void xfrm_policy_gc_kill(struct xfrm_policy *policy)
382 {
383 struct dst_entry *dst;
384
385 while ((dst = policy->bundles) != NULL) {
386 policy->bundles = dst->next;
387 dst_free(dst);
388 }
389
390 if (del_timer(&policy->timer))
391 atomic_dec(&policy->refcnt);
392
393 if (atomic_read(&policy->refcnt) > 1)
394 flow_cache_flush();
395
396 xfrm_pol_put(policy);
397 }
398
399 static void xfrm_policy_gc_task(struct work_struct *work)
400 {
401 struct xfrm_policy *policy;
402 struct hlist_node *entry, *tmp;
403 struct hlist_head gc_list;
404
405 spin_lock_bh(&xfrm_policy_gc_lock);
406 gc_list.first = xfrm_policy_gc_list.first;
407 INIT_HLIST_HEAD(&xfrm_policy_gc_list);
408 spin_unlock_bh(&xfrm_policy_gc_lock);
409
410 hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst)
411 xfrm_policy_gc_kill(policy);
412 }
413
414 /* Rule must be locked. Release descentant resources, announce
415 * entry dead. The rule must be unlinked from lists to the moment.
416 */
417
418 static void xfrm_policy_kill(struct xfrm_policy *policy)
419 {
420 int dead;
421
422 write_lock_bh(&policy->lock);
423 dead = policy->dead;
424 policy->dead = 1;
425 write_unlock_bh(&policy->lock);
426
427 if (unlikely(dead)) {
428 WARN_ON(1);
429 return;
430 }
431
432 spin_lock(&xfrm_policy_gc_lock);
433 hlist_add_head(&policy->bydst, &xfrm_policy_gc_list);
434 spin_unlock(&xfrm_policy_gc_lock);
435
436 schedule_work(&xfrm_policy_gc_work);
437 }
438
439 struct xfrm_policy_hash {
440 struct hlist_head *table;
441 unsigned int hmask;
442 };
443
444 static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2];
445 static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly;
446 static struct hlist_head *xfrm_policy_byidx __read_mostly;
447 static unsigned int xfrm_idx_hmask __read_mostly;
448 static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
449
450 static inline unsigned int idx_hash(u32 index)
451 {
452 return __idx_hash(index, xfrm_idx_hmask);
453 }
454
455 static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir)
456 {
457 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
458 unsigned int hash = __sel_hash(sel, family, hmask);
459
460 return (hash == hmask + 1 ?
461 &xfrm_policy_inexact[dir] :
462 xfrm_policy_bydst[dir].table + hash);
463 }
464
465 static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir)
466 {
467 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
468 unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
469
470 return xfrm_policy_bydst[dir].table + hash;
471 }
472
473 static void xfrm_dst_hash_transfer(struct hlist_head *list,
474 struct hlist_head *ndsttable,
475 unsigned int nhashmask)
476 {
477 struct hlist_node *entry, *tmp;
478 struct xfrm_policy *pol;
479
480 hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) {
481 unsigned int h;
482
483 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
484 pol->family, nhashmask);
485 hlist_add_head(&pol->bydst, ndsttable+h);
486 }
487 }
488
489 static void xfrm_idx_hash_transfer(struct hlist_head *list,
490 struct hlist_head *nidxtable,
491 unsigned int nhashmask)
492 {
493 struct hlist_node *entry, *tmp;
494 struct xfrm_policy *pol;
495
496 hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) {
497 unsigned int h;
498
499 h = __idx_hash(pol->index, nhashmask);
500 hlist_add_head(&pol->byidx, nidxtable+h);
501 }
502 }
503
504 static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
505 {
506 return ((old_hmask + 1) << 1) - 1;
507 }
508
509 static void xfrm_bydst_resize(int dir)
510 {
511 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
512 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
513 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
514 struct hlist_head *odst = xfrm_policy_bydst[dir].table;
515 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
516 int i;
517
518 if (!ndst)
519 return;
520
521 write_lock_bh(&xfrm_policy_lock);
522
523 for (i = hmask; i >= 0; i--)
524 xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
525
526 xfrm_policy_bydst[dir].table = ndst;
527 xfrm_policy_bydst[dir].hmask = nhashmask;
528
529 write_unlock_bh(&xfrm_policy_lock);
530
531 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
532 }
533
534 static void xfrm_byidx_resize(int total)
535 {
536 unsigned int hmask = xfrm_idx_hmask;
537 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
538 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
539 struct hlist_head *oidx = xfrm_policy_byidx;
540 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
541 int i;
542
543 if (!nidx)
544 return;
545
546 write_lock_bh(&xfrm_policy_lock);
547
548 for (i = hmask; i >= 0; i--)
549 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
550
551 xfrm_policy_byidx = nidx;
552 xfrm_idx_hmask = nhashmask;
553
554 write_unlock_bh(&xfrm_policy_lock);
555
556 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
557 }
558
559 static inline int xfrm_bydst_should_resize(int dir, int *total)
560 {
561 unsigned int cnt = xfrm_policy_count[dir];
562 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
563
564 if (total)
565 *total += cnt;
566
567 if ((hmask + 1) < xfrm_policy_hashmax &&
568 cnt > hmask)
569 return 1;
570
571 return 0;
572 }
573
574 static inline int xfrm_byidx_should_resize(int total)
575 {
576 unsigned int hmask = xfrm_idx_hmask;
577
578 if ((hmask + 1) < xfrm_policy_hashmax &&
579 total > hmask)
580 return 1;
581
582 return 0;
583 }
584
585 void xfrm_spd_getinfo(struct xfrmk_spdinfo *si)
586 {
587 read_lock_bh(&xfrm_policy_lock);
588 si->incnt = xfrm_policy_count[XFRM_POLICY_IN];
589 si->outcnt = xfrm_policy_count[XFRM_POLICY_OUT];
590 si->fwdcnt = xfrm_policy_count[XFRM_POLICY_FWD];
591 si->inscnt = xfrm_policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
592 si->outscnt = xfrm_policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
593 si->fwdscnt = xfrm_policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
594 si->spdhcnt = xfrm_idx_hmask;
595 si->spdhmcnt = xfrm_policy_hashmax;
596 read_unlock_bh(&xfrm_policy_lock);
597 }
598 EXPORT_SYMBOL(xfrm_spd_getinfo);
599
600 static DEFINE_MUTEX(hash_resize_mutex);
601 static void xfrm_hash_resize(struct work_struct *__unused)
602 {
603 int dir, total;
604
605 mutex_lock(&hash_resize_mutex);
606
607 total = 0;
608 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
609 if (xfrm_bydst_should_resize(dir, &total))
610 xfrm_bydst_resize(dir);
611 }
612 if (xfrm_byidx_should_resize(total))
613 xfrm_byidx_resize(total);
614
615 mutex_unlock(&hash_resize_mutex);
616 }
617
618 static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize);
619
620 /* Generate new index... KAME seems to generate them ordered by cost
621 * of an absolute inpredictability of ordering of rules. This will not pass. */
622 static u32 xfrm_gen_index(u8 type, int dir)
623 {
624 static u32 idx_generator;
625
626 for (;;) {
627 struct hlist_node *entry;
628 struct hlist_head *list;
629 struct xfrm_policy *p;
630 u32 idx;
631 int found;
632
633 idx = (idx_generator | dir);
634 idx_generator += 8;
635 if (idx == 0)
636 idx = 8;
637 list = xfrm_policy_byidx + idx_hash(idx);
638 found = 0;
639 hlist_for_each_entry(p, entry, list, byidx) {
640 if (p->index == idx) {
641 found = 1;
642 break;
643 }
644 }
645 if (!found)
646 return idx;
647 }
648 }
649
650 static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
651 {
652 u32 *p1 = (u32 *) s1;
653 u32 *p2 = (u32 *) s2;
654 int len = sizeof(struct xfrm_selector) / sizeof(u32);
655 int i;
656
657 for (i = 0; i < len; i++) {
658 if (p1[i] != p2[i])
659 return 1;
660 }
661
662 return 0;
663 }
664
665 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
666 {
667 struct xfrm_policy *pol;
668 struct xfrm_policy *delpol;
669 struct hlist_head *chain;
670 struct hlist_node *entry, *newpos;
671 struct dst_entry *gc_list;
672
673 write_lock_bh(&xfrm_policy_lock);
674 chain = policy_hash_bysel(&policy->selector, policy->family, dir);
675 delpol = NULL;
676 newpos = NULL;
677 hlist_for_each_entry(pol, entry, chain, bydst) {
678 if (pol->type == policy->type &&
679 !selector_cmp(&pol->selector, &policy->selector) &&
680 xfrm_sec_ctx_match(pol->security, policy->security) &&
681 !WARN_ON(delpol)) {
682 if (excl) {
683 write_unlock_bh(&xfrm_policy_lock);
684 return -EEXIST;
685 }
686 delpol = pol;
687 if (policy->priority > pol->priority)
688 continue;
689 } else if (policy->priority >= pol->priority) {
690 newpos = &pol->bydst;
691 continue;
692 }
693 if (delpol)
694 break;
695 }
696 if (newpos)
697 hlist_add_after(newpos, &policy->bydst);
698 else
699 hlist_add_head(&policy->bydst, chain);
700 xfrm_pol_hold(policy);
701 xfrm_policy_count[dir]++;
702 atomic_inc(&flow_cache_genid);
703 if (delpol) {
704 hlist_del(&delpol->bydst);
705 hlist_del(&delpol->byidx);
706 xfrm_policy_count[dir]--;
707 }
708 policy->index = delpol ? delpol->index : xfrm_gen_index(policy->type, dir);
709 hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index));
710 policy->curlft.add_time = get_seconds();
711 policy->curlft.use_time = 0;
712 if (!mod_timer(&policy->timer, jiffies + HZ))
713 xfrm_pol_hold(policy);
714 write_unlock_bh(&xfrm_policy_lock);
715
716 if (delpol)
717 xfrm_policy_kill(delpol);
718 else if (xfrm_bydst_should_resize(dir, NULL))
719 schedule_work(&xfrm_hash_work);
720
721 read_lock_bh(&xfrm_policy_lock);
722 gc_list = NULL;
723 entry = &policy->bydst;
724 hlist_for_each_entry_continue(policy, entry, bydst) {
725 struct dst_entry *dst;
726
727 write_lock(&policy->lock);
728 dst = policy->bundles;
729 if (dst) {
730 struct dst_entry *tail = dst;
731 while (tail->next)
732 tail = tail->next;
733 tail->next = gc_list;
734 gc_list = dst;
735
736 policy->bundles = NULL;
737 }
738 write_unlock(&policy->lock);
739 }
740 read_unlock_bh(&xfrm_policy_lock);
741
742 while (gc_list) {
743 struct dst_entry *dst = gc_list;
744
745 gc_list = dst->next;
746 dst_free(dst);
747 }
748
749 return 0;
750 }
751 EXPORT_SYMBOL(xfrm_policy_insert);
752
753 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
754 struct xfrm_selector *sel,
755 struct xfrm_sec_ctx *ctx, int delete,
756 int *err)
757 {
758 struct xfrm_policy *pol, *ret;
759 struct hlist_head *chain;
760 struct hlist_node *entry;
761
762 *err = 0;
763 write_lock_bh(&xfrm_policy_lock);
764 chain = policy_hash_bysel(sel, sel->family, dir);
765 ret = NULL;
766 hlist_for_each_entry(pol, entry, chain, bydst) {
767 if (pol->type == type &&
768 !selector_cmp(sel, &pol->selector) &&
769 xfrm_sec_ctx_match(ctx, pol->security)) {
770 xfrm_pol_hold(pol);
771 if (delete) {
772 *err = security_xfrm_policy_delete(pol);
773 if (*err) {
774 write_unlock_bh(&xfrm_policy_lock);
775 return pol;
776 }
777 hlist_del(&pol->bydst);
778 hlist_del(&pol->byidx);
779 xfrm_policy_count[dir]--;
780 }
781 ret = pol;
782 break;
783 }
784 }
785 write_unlock_bh(&xfrm_policy_lock);
786
787 if (ret && delete) {
788 atomic_inc(&flow_cache_genid);
789 xfrm_policy_kill(ret);
790 }
791 return ret;
792 }
793 EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
794
795 struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete,
796 int *err)
797 {
798 struct xfrm_policy *pol, *ret;
799 struct hlist_head *chain;
800 struct hlist_node *entry;
801
802 *err = -ENOENT;
803 if (xfrm_policy_id2dir(id) != dir)
804 return NULL;
805
806 *err = 0;
807 write_lock_bh(&xfrm_policy_lock);
808 chain = xfrm_policy_byidx + idx_hash(id);
809 ret = NULL;
810 hlist_for_each_entry(pol, entry, chain, byidx) {
811 if (pol->type == type && pol->index == id) {
812 xfrm_pol_hold(pol);
813 if (delete) {
814 *err = security_xfrm_policy_delete(pol);
815 if (*err) {
816 write_unlock_bh(&xfrm_policy_lock);
817 return pol;
818 }
819 hlist_del(&pol->bydst);
820 hlist_del(&pol->byidx);
821 xfrm_policy_count[dir]--;
822 }
823 ret = pol;
824 break;
825 }
826 }
827 write_unlock_bh(&xfrm_policy_lock);
828
829 if (ret && delete) {
830 atomic_inc(&flow_cache_genid);
831 xfrm_policy_kill(ret);
832 }
833 return ret;
834 }
835 EXPORT_SYMBOL(xfrm_policy_byid);
836
837 void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info)
838 {
839 int dir;
840
841 write_lock_bh(&xfrm_policy_lock);
842 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
843 struct xfrm_policy *pol;
844 struct hlist_node *entry;
845 int i, killed;
846
847 killed = 0;
848 again1:
849 hlist_for_each_entry(pol, entry,
850 &xfrm_policy_inexact[dir], bydst) {
851 if (pol->type != type)
852 continue;
853 hlist_del(&pol->bydst);
854 hlist_del(&pol->byidx);
855 write_unlock_bh(&xfrm_policy_lock);
856
857 xfrm_audit_log(audit_info->loginuid, audit_info->secid,
858 AUDIT_MAC_IPSEC_DELSPD, 1, pol, NULL);
859
860 xfrm_policy_kill(pol);
861 killed++;
862
863 write_lock_bh(&xfrm_policy_lock);
864 goto again1;
865 }
866
867 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
868 again2:
869 hlist_for_each_entry(pol, entry,
870 xfrm_policy_bydst[dir].table + i,
871 bydst) {
872 if (pol->type != type)
873 continue;
874 hlist_del(&pol->bydst);
875 hlist_del(&pol->byidx);
876 write_unlock_bh(&xfrm_policy_lock);
877
878 xfrm_audit_log(audit_info->loginuid,
879 audit_info->secid,
880 AUDIT_MAC_IPSEC_DELSPD, 1,
881 pol, NULL);
882
883 xfrm_policy_kill(pol);
884 killed++;
885
886 write_lock_bh(&xfrm_policy_lock);
887 goto again2;
888 }
889 }
890
891 xfrm_policy_count[dir] -= killed;
892 }
893 atomic_inc(&flow_cache_genid);
894 write_unlock_bh(&xfrm_policy_lock);
895 }
896 EXPORT_SYMBOL(xfrm_policy_flush);
897
898 int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*),
899 void *data)
900 {
901 struct xfrm_policy *pol, *last = NULL;
902 struct hlist_node *entry;
903 int dir, last_dir = 0, count, error;
904
905 read_lock_bh(&xfrm_policy_lock);
906 count = 0;
907
908 for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) {
909 struct hlist_head *table = xfrm_policy_bydst[dir].table;
910 int i;
911
912 hlist_for_each_entry(pol, entry,
913 &xfrm_policy_inexact[dir], bydst) {
914 if (pol->type != type)
915 continue;
916 if (last) {
917 error = func(last, last_dir % XFRM_POLICY_MAX,
918 count, data);
919 if (error)
920 goto out;
921 }
922 last = pol;
923 last_dir = dir;
924 count++;
925 }
926 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
927 hlist_for_each_entry(pol, entry, table + i, bydst) {
928 if (pol->type != type)
929 continue;
930 if (last) {
931 error = func(last, last_dir % XFRM_POLICY_MAX,
932 count, data);
933 if (error)
934 goto out;
935 }
936 last = pol;
937 last_dir = dir;
938 count++;
939 }
940 }
941 }
942 if (count == 0) {
943 error = -ENOENT;
944 goto out;
945 }
946 error = func(last, last_dir % XFRM_POLICY_MAX, 0, data);
947 out:
948 read_unlock_bh(&xfrm_policy_lock);
949 return error;
950 }
951 EXPORT_SYMBOL(xfrm_policy_walk);
952
953 /*
954 * Find policy to apply to this flow.
955 *
956 * Returns 0 if policy found, else an -errno.
957 */
958 static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl,
959 u8 type, u16 family, int dir)
960 {
961 struct xfrm_selector *sel = &pol->selector;
962 int match, ret = -ESRCH;
963
964 if (pol->family != family ||
965 pol->type != type)
966 return ret;
967
968 match = xfrm_selector_match(sel, fl, family);
969 if (match)
970 ret = security_xfrm_policy_lookup(pol, fl->secid, dir);
971
972 return ret;
973 }
974
975 static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl,
976 u16 family, u8 dir)
977 {
978 int err;
979 struct xfrm_policy *pol, *ret;
980 xfrm_address_t *daddr, *saddr;
981 struct hlist_node *entry;
982 struct hlist_head *chain;
983 u32 priority = ~0U;
984
985 daddr = xfrm_flowi_daddr(fl, family);
986 saddr = xfrm_flowi_saddr(fl, family);
987 if (unlikely(!daddr || !saddr))
988 return NULL;
989
990 read_lock_bh(&xfrm_policy_lock);
991 chain = policy_hash_direct(daddr, saddr, family, dir);
992 ret = NULL;
993 hlist_for_each_entry(pol, entry, chain, bydst) {
994 err = xfrm_policy_match(pol, fl, type, family, dir);
995 if (err) {
996 if (err == -ESRCH)
997 continue;
998 else {
999 ret = ERR_PTR(err);
1000 goto fail;
1001 }
1002 } else {
1003 ret = pol;
1004 priority = ret->priority;
1005 break;
1006 }
1007 }
1008 chain = &xfrm_policy_inexact[dir];
1009 hlist_for_each_entry(pol, entry, chain, bydst) {
1010 err = xfrm_policy_match(pol, fl, type, family, dir);
1011 if (err) {
1012 if (err == -ESRCH)
1013 continue;
1014 else {
1015 ret = ERR_PTR(err);
1016 goto fail;
1017 }
1018 } else if (pol->priority < priority) {
1019 ret = pol;
1020 break;
1021 }
1022 }
1023 if (ret)
1024 xfrm_pol_hold(ret);
1025 fail:
1026 read_unlock_bh(&xfrm_policy_lock);
1027
1028 return ret;
1029 }
1030
1031 static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir,
1032 void **objp, atomic_t **obj_refp)
1033 {
1034 struct xfrm_policy *pol;
1035 int err = 0;
1036
1037 #ifdef CONFIG_XFRM_SUB_POLICY
1038 pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir);
1039 if (IS_ERR(pol)) {
1040 err = PTR_ERR(pol);
1041 pol = NULL;
1042 }
1043 if (pol || err)
1044 goto end;
1045 #endif
1046 pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir);
1047 if (IS_ERR(pol)) {
1048 err = PTR_ERR(pol);
1049 pol = NULL;
1050 }
1051 #ifdef CONFIG_XFRM_SUB_POLICY
1052 end:
1053 #endif
1054 if ((*objp = (void *) pol) != NULL)
1055 *obj_refp = &pol->refcnt;
1056 return err;
1057 }
1058
1059 static inline int policy_to_flow_dir(int dir)
1060 {
1061 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
1062 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1063 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1064 return dir;
1065 switch (dir) {
1066 default:
1067 case XFRM_POLICY_IN:
1068 return FLOW_DIR_IN;
1069 case XFRM_POLICY_OUT:
1070 return FLOW_DIR_OUT;
1071 case XFRM_POLICY_FWD:
1072 return FLOW_DIR_FWD;
1073 }
1074 }
1075
1076 static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl)
1077 {
1078 struct xfrm_policy *pol;
1079
1080 read_lock_bh(&xfrm_policy_lock);
1081 if ((pol = sk->sk_policy[dir]) != NULL) {
1082 int match = xfrm_selector_match(&pol->selector, fl,
1083 sk->sk_family);
1084 int err = 0;
1085
1086 if (match) {
1087 err = security_xfrm_policy_lookup(pol, fl->secid,
1088 policy_to_flow_dir(dir));
1089 if (!err)
1090 xfrm_pol_hold(pol);
1091 else if (err == -ESRCH)
1092 pol = NULL;
1093 else
1094 pol = ERR_PTR(err);
1095 } else
1096 pol = NULL;
1097 }
1098 read_unlock_bh(&xfrm_policy_lock);
1099 return pol;
1100 }
1101
1102 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1103 {
1104 struct hlist_head *chain = policy_hash_bysel(&pol->selector,
1105 pol->family, dir);
1106
1107 hlist_add_head(&pol->bydst, chain);
1108 hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index));
1109 xfrm_policy_count[dir]++;
1110 xfrm_pol_hold(pol);
1111
1112 if (xfrm_bydst_should_resize(dir, NULL))
1113 schedule_work(&xfrm_hash_work);
1114 }
1115
1116 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1117 int dir)
1118 {
1119 if (hlist_unhashed(&pol->bydst))
1120 return NULL;
1121
1122 hlist_del(&pol->bydst);
1123 hlist_del(&pol->byidx);
1124 xfrm_policy_count[dir]--;
1125
1126 return pol;
1127 }
1128
1129 int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1130 {
1131 write_lock_bh(&xfrm_policy_lock);
1132 pol = __xfrm_policy_unlink(pol, dir);
1133 write_unlock_bh(&xfrm_policy_lock);
1134 if (pol) {
1135 if (dir < XFRM_POLICY_MAX)
1136 atomic_inc(&flow_cache_genid);
1137 xfrm_policy_kill(pol);
1138 return 0;
1139 }
1140 return -ENOENT;
1141 }
1142 EXPORT_SYMBOL(xfrm_policy_delete);
1143
1144 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1145 {
1146 struct xfrm_policy *old_pol;
1147
1148 #ifdef CONFIG_XFRM_SUB_POLICY
1149 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1150 return -EINVAL;
1151 #endif
1152
1153 write_lock_bh(&xfrm_policy_lock);
1154 old_pol = sk->sk_policy[dir];
1155 sk->sk_policy[dir] = pol;
1156 if (pol) {
1157 pol->curlft.add_time = get_seconds();
1158 pol->index = xfrm_gen_index(pol->type, XFRM_POLICY_MAX+dir);
1159 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
1160 }
1161 if (old_pol)
1162 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
1163 write_unlock_bh(&xfrm_policy_lock);
1164
1165 if (old_pol) {
1166 xfrm_policy_kill(old_pol);
1167 }
1168 return 0;
1169 }
1170
1171 static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir)
1172 {
1173 struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC);
1174
1175 if (newp) {
1176 newp->selector = old->selector;
1177 if (security_xfrm_policy_clone(old, newp)) {
1178 kfree(newp);
1179 return NULL; /* ENOMEM */
1180 }
1181 newp->lft = old->lft;
1182 newp->curlft = old->curlft;
1183 newp->action = old->action;
1184 newp->flags = old->flags;
1185 newp->xfrm_nr = old->xfrm_nr;
1186 newp->index = old->index;
1187 newp->type = old->type;
1188 memcpy(newp->xfrm_vec, old->xfrm_vec,
1189 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1190 write_lock_bh(&xfrm_policy_lock);
1191 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
1192 write_unlock_bh(&xfrm_policy_lock);
1193 xfrm_pol_put(newp);
1194 }
1195 return newp;
1196 }
1197
1198 int __xfrm_sk_clone_policy(struct sock *sk)
1199 {
1200 struct xfrm_policy *p0 = sk->sk_policy[0],
1201 *p1 = sk->sk_policy[1];
1202
1203 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1204 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1205 return -ENOMEM;
1206 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1207 return -ENOMEM;
1208 return 0;
1209 }
1210
1211 static int
1212 xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote,
1213 unsigned short family)
1214 {
1215 int err;
1216 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1217
1218 if (unlikely(afinfo == NULL))
1219 return -EINVAL;
1220 err = afinfo->get_saddr(local, remote);
1221 xfrm_policy_put_afinfo(afinfo);
1222 return err;
1223 }
1224
1225 /* Resolve list of templates for the flow, given policy. */
1226
1227 static int
1228 xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl,
1229 struct xfrm_state **xfrm,
1230 unsigned short family)
1231 {
1232 int nx;
1233 int i, error;
1234 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1235 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
1236 xfrm_address_t tmp;
1237
1238 for (nx=0, i = 0; i < policy->xfrm_nr; i++) {
1239 struct xfrm_state *x;
1240 xfrm_address_t *remote = daddr;
1241 xfrm_address_t *local = saddr;
1242 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1243
1244 if (tmpl->mode == XFRM_MODE_TUNNEL) {
1245 remote = &tmpl->id.daddr;
1246 local = &tmpl->saddr;
1247 family = tmpl->encap_family;
1248 if (xfrm_addr_any(local, family)) {
1249 error = xfrm_get_saddr(&tmp, remote, family);
1250 if (error)
1251 goto fail;
1252 local = &tmp;
1253 }
1254 }
1255
1256 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1257
1258 if (x && x->km.state == XFRM_STATE_VALID) {
1259 xfrm[nx++] = x;
1260 daddr = remote;
1261 saddr = local;
1262 continue;
1263 }
1264 if (x) {
1265 error = (x->km.state == XFRM_STATE_ERROR ?
1266 -EINVAL : -EAGAIN);
1267 xfrm_state_put(x);
1268 }
1269
1270 if (!tmpl->optional)
1271 goto fail;
1272 }
1273 return nx;
1274
1275 fail:
1276 for (nx--; nx>=0; nx--)
1277 xfrm_state_put(xfrm[nx]);
1278 return error;
1279 }
1280
1281 static int
1282 xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl,
1283 struct xfrm_state **xfrm,
1284 unsigned short family)
1285 {
1286 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1287 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
1288 int cnx = 0;
1289 int error;
1290 int ret;
1291 int i;
1292
1293 for (i = 0; i < npols; i++) {
1294 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1295 error = -ENOBUFS;
1296 goto fail;
1297 }
1298
1299 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
1300 if (ret < 0) {
1301 error = ret;
1302 goto fail;
1303 } else
1304 cnx += ret;
1305 }
1306
1307 /* found states are sorted for outbound processing */
1308 if (npols > 1)
1309 xfrm_state_sort(xfrm, tpp, cnx, family);
1310
1311 return cnx;
1312
1313 fail:
1314 for (cnx--; cnx>=0; cnx--)
1315 xfrm_state_put(tpp[cnx]);
1316 return error;
1317
1318 }
1319
1320 /* Check that the bundle accepts the flow and its components are
1321 * still valid.
1322 */
1323
1324 static struct dst_entry *
1325 xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family)
1326 {
1327 struct dst_entry *x;
1328 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1329 if (unlikely(afinfo == NULL))
1330 return ERR_PTR(-EINVAL);
1331 x = afinfo->find_bundle(fl, policy);
1332 xfrm_policy_put_afinfo(afinfo);
1333 return x;
1334 }
1335
1336 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1337 * all the metrics... Shortly, bundle a bundle.
1338 */
1339
1340 static int
1341 xfrm_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
1342 struct flowi *fl, struct dst_entry **dst_p,
1343 unsigned short family)
1344 {
1345 int err;
1346 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1347 if (unlikely(afinfo == NULL))
1348 return -EINVAL;
1349 err = afinfo->bundle_create(policy, xfrm, nx, fl, dst_p);
1350 xfrm_policy_put_afinfo(afinfo);
1351 return err;
1352 }
1353
1354 static int inline
1355 xfrm_dst_alloc_copy(void **target, void *src, int size)
1356 {
1357 if (!*target) {
1358 *target = kmalloc(size, GFP_ATOMIC);
1359 if (!*target)
1360 return -ENOMEM;
1361 }
1362 memcpy(*target, src, size);
1363 return 0;
1364 }
1365
1366 static int inline
1367 xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel)
1368 {
1369 #ifdef CONFIG_XFRM_SUB_POLICY
1370 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1371 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1372 sel, sizeof(*sel));
1373 #else
1374 return 0;
1375 #endif
1376 }
1377
1378 static int inline
1379 xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl)
1380 {
1381 #ifdef CONFIG_XFRM_SUB_POLICY
1382 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1383 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1384 #else
1385 return 0;
1386 #endif
1387 }
1388
1389 static int stale_bundle(struct dst_entry *dst);
1390
1391 /* Main function: finds/creates a bundle for given flow.
1392 *
1393 * At the moment we eat a raw IP route. Mostly to speed up lookups
1394 * on interfaces with disabled IPsec.
1395 */
1396 int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
1397 struct sock *sk, int flags)
1398 {
1399 struct xfrm_policy *policy;
1400 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1401 int npols;
1402 int pol_dead;
1403 int xfrm_nr;
1404 int pi;
1405 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1406 struct dst_entry *dst, *dst_orig = *dst_p;
1407 int nx = 0;
1408 int err;
1409 u32 genid;
1410 u16 family;
1411 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
1412
1413 restart:
1414 genid = atomic_read(&flow_cache_genid);
1415 policy = NULL;
1416 for (pi = 0; pi < ARRAY_SIZE(pols); pi++)
1417 pols[pi] = NULL;
1418 npols = 0;
1419 pol_dead = 0;
1420 xfrm_nr = 0;
1421
1422 if (sk && sk->sk_policy[1]) {
1423 policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
1424 if (IS_ERR(policy))
1425 return PTR_ERR(policy);
1426 }
1427
1428 if (!policy) {
1429 /* To accelerate a bit... */
1430 if ((dst_orig->flags & DST_NOXFRM) ||
1431 !xfrm_policy_count[XFRM_POLICY_OUT])
1432 return 0;
1433
1434 policy = flow_cache_lookup(fl, dst_orig->ops->family,
1435 dir, xfrm_policy_lookup);
1436 if (IS_ERR(policy))
1437 return PTR_ERR(policy);
1438 }
1439
1440 if (!policy)
1441 return 0;
1442
1443 family = dst_orig->ops->family;
1444 policy->curlft.use_time = get_seconds();
1445 pols[0] = policy;
1446 npols ++;
1447 xfrm_nr += pols[0]->xfrm_nr;
1448
1449 switch (policy->action) {
1450 case XFRM_POLICY_BLOCK:
1451 /* Prohibit the flow */
1452 err = -EPERM;
1453 goto error;
1454
1455 case XFRM_POLICY_ALLOW:
1456 #ifndef CONFIG_XFRM_SUB_POLICY
1457 if (policy->xfrm_nr == 0) {
1458 /* Flow passes not transformed. */
1459 xfrm_pol_put(policy);
1460 return 0;
1461 }
1462 #endif
1463
1464 /* Try to find matching bundle.
1465 *
1466 * LATER: help from flow cache. It is optional, this
1467 * is required only for output policy.
1468 */
1469 dst = xfrm_find_bundle(fl, policy, family);
1470 if (IS_ERR(dst)) {
1471 err = PTR_ERR(dst);
1472 goto error;
1473 }
1474
1475 if (dst)
1476 break;
1477
1478 #ifdef CONFIG_XFRM_SUB_POLICY
1479 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1480 pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN,
1481 fl, family,
1482 XFRM_POLICY_OUT);
1483 if (pols[1]) {
1484 if (IS_ERR(pols[1])) {
1485 err = PTR_ERR(pols[1]);
1486 goto error;
1487 }
1488 if (pols[1]->action == XFRM_POLICY_BLOCK) {
1489 err = -EPERM;
1490 goto error;
1491 }
1492 npols ++;
1493 xfrm_nr += pols[1]->xfrm_nr;
1494 }
1495 }
1496
1497 /*
1498 * Because neither flowi nor bundle information knows about
1499 * transformation template size. On more than one policy usage
1500 * we can realize whether all of them is bypass or not after
1501 * they are searched. See above not-transformed bypass
1502 * is surrounded by non-sub policy configuration, too.
1503 */
1504 if (xfrm_nr == 0) {
1505 /* Flow passes not transformed. */
1506 xfrm_pols_put(pols, npols);
1507 return 0;
1508 }
1509
1510 #endif
1511 nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);
1512
1513 if (unlikely(nx<0)) {
1514 err = nx;
1515 if (err == -EAGAIN && sysctl_xfrm_larval_drop) {
1516 /* EREMOTE tells the caller to generate
1517 * a one-shot blackhole route.
1518 */
1519 xfrm_pol_put(policy);
1520 return -EREMOTE;
1521 }
1522 if (err == -EAGAIN && flags) {
1523 DECLARE_WAITQUEUE(wait, current);
1524
1525 add_wait_queue(&km_waitq, &wait);
1526 set_current_state(TASK_INTERRUPTIBLE);
1527 schedule();
1528 set_current_state(TASK_RUNNING);
1529 remove_wait_queue(&km_waitq, &wait);
1530
1531 nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);
1532
1533 if (nx == -EAGAIN && signal_pending(current)) {
1534 err = -ERESTART;
1535 goto error;
1536 }
1537 if (nx == -EAGAIN ||
1538 genid != atomic_read(&flow_cache_genid)) {
1539 xfrm_pols_put(pols, npols);
1540 goto restart;
1541 }
1542 err = nx;
1543 }
1544 if (err < 0)
1545 goto error;
1546 }
1547 if (nx == 0) {
1548 /* Flow passes not transformed. */
1549 xfrm_pols_put(pols, npols);
1550 return 0;
1551 }
1552
1553 dst = dst_orig;
1554 err = xfrm_bundle_create(policy, xfrm, nx, fl, &dst, family);
1555
1556 if (unlikely(err)) {
1557 int i;
1558 for (i=0; i<nx; i++)
1559 xfrm_state_put(xfrm[i]);
1560 goto error;
1561 }
1562
1563 for (pi = 0; pi < npols; pi++) {
1564 read_lock_bh(&pols[pi]->lock);
1565 pol_dead |= pols[pi]->dead;
1566 read_unlock_bh(&pols[pi]->lock);
1567 }
1568
1569 write_lock_bh(&policy->lock);
1570 if (unlikely(pol_dead || stale_bundle(dst))) {
1571 /* Wow! While we worked on resolving, this
1572 * policy has gone. Retry. It is not paranoia,
1573 * we just cannot enlist new bundle to dead object.
1574 * We can't enlist stable bundles either.
1575 */
1576 write_unlock_bh(&policy->lock);
1577 if (dst)
1578 dst_free(dst);
1579
1580 err = -EHOSTUNREACH;
1581 goto error;
1582 }
1583
1584 if (npols > 1)
1585 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1586 else
1587 err = xfrm_dst_update_origin(dst, fl);
1588 if (unlikely(err)) {
1589 write_unlock_bh(&policy->lock);
1590 if (dst)
1591 dst_free(dst);
1592 goto error;
1593 }
1594
1595 dst->next = policy->bundles;
1596 policy->bundles = dst;
1597 dst_hold(dst);
1598 write_unlock_bh(&policy->lock);
1599 }
1600 *dst_p = dst;
1601 dst_release(dst_orig);
1602 xfrm_pols_put(pols, npols);
1603 return 0;
1604
1605 error:
1606 dst_release(dst_orig);
1607 xfrm_pols_put(pols, npols);
1608 *dst_p = NULL;
1609 return err;
1610 }
1611 EXPORT_SYMBOL(__xfrm_lookup);
1612
1613 int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
1614 struct sock *sk, int flags)
1615 {
1616 int err = __xfrm_lookup(dst_p, fl, sk, flags);
1617
1618 if (err == -EREMOTE) {
1619 dst_release(*dst_p);
1620 *dst_p = NULL;
1621 err = -EAGAIN;
1622 }
1623
1624 return err;
1625 }
1626 EXPORT_SYMBOL(xfrm_lookup);
1627
1628 static inline int
1629 xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl)
1630 {
1631 struct xfrm_state *x;
1632 int err;
1633
1634 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
1635 return 0;
1636 x = skb->sp->xvec[idx];
1637 if (!x->type->reject)
1638 return 0;
1639 xfrm_state_hold(x);
1640 err = x->type->reject(x, skb, fl);
1641 xfrm_state_put(x);
1642 return err;
1643 }
1644
1645 /* When skb is transformed back to its "native" form, we have to
1646 * check policy restrictions. At the moment we make this in maximally
1647 * stupid way. Shame on me. :-) Of course, connected sockets must
1648 * have policy cached at them.
1649 */
1650
1651 static inline int
1652 xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x,
1653 unsigned short family)
1654 {
1655 if (xfrm_state_kern(x))
1656 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
1657 return x->id.proto == tmpl->id.proto &&
1658 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
1659 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
1660 x->props.mode == tmpl->mode &&
1661 ((tmpl->aalgos & (1<<x->props.aalgo)) ||
1662 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
1663 !(x->props.mode != XFRM_MODE_TRANSPORT &&
1664 xfrm_state_addr_cmp(tmpl, x, family));
1665 }
1666
1667 /*
1668 * 0 or more than 0 is returned when validation is succeeded (either bypass
1669 * because of optional transport mode, or next index of the mathced secpath
1670 * state with the template.
1671 * -1 is returned when no matching template is found.
1672 * Otherwise "-2 - errored_index" is returned.
1673 */
1674 static inline int
1675 xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start,
1676 unsigned short family)
1677 {
1678 int idx = start;
1679
1680 if (tmpl->optional) {
1681 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1682 return start;
1683 } else
1684 start = -1;
1685 for (; idx < sp->len; idx++) {
1686 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
1687 return ++idx;
1688 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
1689 if (start == -1)
1690 start = -2-idx;
1691 break;
1692 }
1693 }
1694 return start;
1695 }
1696
1697 int
1698 xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family)
1699 {
1700 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1701 int err;
1702
1703 if (unlikely(afinfo == NULL))
1704 return -EAFNOSUPPORT;
1705
1706 afinfo->decode_session(skb, fl);
1707 err = security_xfrm_decode_session(skb, &fl->secid);
1708 xfrm_policy_put_afinfo(afinfo);
1709 return err;
1710 }
1711 EXPORT_SYMBOL(xfrm_decode_session);
1712
1713 static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp)
1714 {
1715 for (; k < sp->len; k++) {
1716 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
1717 *idxp = k;
1718 return 1;
1719 }
1720 }
1721
1722 return 0;
1723 }
1724
1725 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
1726 unsigned short family)
1727 {
1728 struct xfrm_policy *pol;
1729 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1730 int npols = 0;
1731 int xfrm_nr;
1732 int pi;
1733 struct flowi fl;
1734 u8 fl_dir = policy_to_flow_dir(dir);
1735 int xerr_idx = -1;
1736
1737 if (xfrm_decode_session(skb, &fl, family) < 0)
1738 return 0;
1739 nf_nat_decode_session(skb, &fl, family);
1740
1741 /* First, check used SA against their selectors. */
1742 if (skb->sp) {
1743 int i;
1744
1745 for (i=skb->sp->len-1; i>=0; i--) {
1746 struct xfrm_state *x = skb->sp->xvec[i];
1747 if (!xfrm_selector_match(&x->sel, &fl, family))
1748 return 0;
1749 }
1750 }
1751
1752 pol = NULL;
1753 if (sk && sk->sk_policy[dir]) {
1754 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
1755 if (IS_ERR(pol))
1756 return 0;
1757 }
1758
1759 if (!pol)
1760 pol = flow_cache_lookup(&fl, family, fl_dir,
1761 xfrm_policy_lookup);
1762
1763 if (IS_ERR(pol))
1764 return 0;
1765
1766 if (!pol) {
1767 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
1768 xfrm_secpath_reject(xerr_idx, skb, &fl);
1769 return 0;
1770 }
1771 return 1;
1772 }
1773
1774 pol->curlft.use_time = get_seconds();
1775
1776 pols[0] = pol;
1777 npols ++;
1778 #ifdef CONFIG_XFRM_SUB_POLICY
1779 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1780 pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN,
1781 &fl, family,
1782 XFRM_POLICY_IN);
1783 if (pols[1]) {
1784 if (IS_ERR(pols[1]))
1785 return 0;
1786 pols[1]->curlft.use_time = get_seconds();
1787 npols ++;
1788 }
1789 }
1790 #endif
1791
1792 if (pol->action == XFRM_POLICY_ALLOW) {
1793 struct sec_path *sp;
1794 static struct sec_path dummy;
1795 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
1796 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
1797 struct xfrm_tmpl **tpp = tp;
1798 int ti = 0;
1799 int i, k;
1800
1801 if ((sp = skb->sp) == NULL)
1802 sp = &dummy;
1803
1804 for (pi = 0; pi < npols; pi++) {
1805 if (pols[pi] != pol &&
1806 pols[pi]->action != XFRM_POLICY_ALLOW)
1807 goto reject;
1808 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH)
1809 goto reject_error;
1810 for (i = 0; i < pols[pi]->xfrm_nr; i++)
1811 tpp[ti++] = &pols[pi]->xfrm_vec[i];
1812 }
1813 xfrm_nr = ti;
1814 if (npols > 1) {
1815 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
1816 tpp = stp;
1817 }
1818
1819 /* For each tunnel xfrm, find the first matching tmpl.
1820 * For each tmpl before that, find corresponding xfrm.
1821 * Order is _important_. Later we will implement
1822 * some barriers, but at the moment barriers
1823 * are implied between each two transformations.
1824 */
1825 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
1826 k = xfrm_policy_ok(tpp[i], sp, k, family);
1827 if (k < 0) {
1828 if (k < -1)
1829 /* "-2 - errored_index" returned */
1830 xerr_idx = -(2+k);
1831 goto reject;
1832 }
1833 }
1834
1835 if (secpath_has_nontransport(sp, k, &xerr_idx))
1836 goto reject;
1837
1838 xfrm_pols_put(pols, npols);
1839 return 1;
1840 }
1841
1842 reject:
1843 xfrm_secpath_reject(xerr_idx, skb, &fl);
1844 reject_error:
1845 xfrm_pols_put(pols, npols);
1846 return 0;
1847 }
1848 EXPORT_SYMBOL(__xfrm_policy_check);
1849
1850 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1851 {
1852 struct flowi fl;
1853
1854 if (xfrm_decode_session(skb, &fl, family) < 0)
1855 return 0;
1856
1857 return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0;
1858 }
1859 EXPORT_SYMBOL(__xfrm_route_forward);
1860
1861 /* Optimize later using cookies and generation ids. */
1862
1863 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
1864 {
1865 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
1866 * to "-1" to force all XFRM destinations to get validated by
1867 * dst_ops->check on every use. We do this because when a
1868 * normal route referenced by an XFRM dst is obsoleted we do
1869 * not go looking around for all parent referencing XFRM dsts
1870 * so that we can invalidate them. It is just too much work.
1871 * Instead we make the checks here on every use. For example:
1872 *
1873 * XFRM dst A --> IPv4 dst X
1874 *
1875 * X is the "xdst->route" of A (X is also the "dst->path" of A
1876 * in this example). If X is marked obsolete, "A" will not
1877 * notice. That's what we are validating here via the
1878 * stale_bundle() check.
1879 *
1880 * When a policy's bundle is pruned, we dst_free() the XFRM
1881 * dst which causes it's ->obsolete field to be set to a
1882 * positive non-zero integer. If an XFRM dst has been pruned
1883 * like this, we want to force a new route lookup.
1884 */
1885 if (dst->obsolete < 0 && !stale_bundle(dst))
1886 return dst;
1887
1888 return NULL;
1889 }
1890
1891 static int stale_bundle(struct dst_entry *dst)
1892 {
1893 return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0);
1894 }
1895
1896 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
1897 {
1898 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
1899 dst->dev = &loopback_dev;
1900 dev_hold(&loopback_dev);
1901 dev_put(dev);
1902 }
1903 }
1904 EXPORT_SYMBOL(xfrm_dst_ifdown);
1905
1906 static void xfrm_link_failure(struct sk_buff *skb)
1907 {
1908 /* Impossible. Such dst must be popped before reaches point of failure. */
1909 return;
1910 }
1911
1912 static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
1913 {
1914 if (dst) {
1915 if (dst->obsolete) {
1916 dst_release(dst);
1917 dst = NULL;
1918 }
1919 }
1920 return dst;
1921 }
1922
1923 static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p)
1924 {
1925 struct dst_entry *dst, **dstp;
1926
1927 write_lock(&pol->lock);
1928 dstp = &pol->bundles;
1929 while ((dst=*dstp) != NULL) {
1930 if (func(dst)) {
1931 *dstp = dst->next;
1932 dst->next = *gc_list_p;
1933 *gc_list_p = dst;
1934 } else {
1935 dstp = &dst->next;
1936 }
1937 }
1938 write_unlock(&pol->lock);
1939 }
1940
1941 static void xfrm_prune_bundles(int (*func)(struct dst_entry *))
1942 {
1943 struct dst_entry *gc_list = NULL;
1944 int dir;
1945
1946 read_lock_bh(&xfrm_policy_lock);
1947 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
1948 struct xfrm_policy *pol;
1949 struct hlist_node *entry;
1950 struct hlist_head *table;
1951 int i;
1952
1953 hlist_for_each_entry(pol, entry,
1954 &xfrm_policy_inexact[dir], bydst)
1955 prune_one_bundle(pol, func, &gc_list);
1956
1957 table = xfrm_policy_bydst[dir].table;
1958 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
1959 hlist_for_each_entry(pol, entry, table + i, bydst)
1960 prune_one_bundle(pol, func, &gc_list);
1961 }
1962 }
1963 read_unlock_bh(&xfrm_policy_lock);
1964
1965 while (gc_list) {
1966 struct dst_entry *dst = gc_list;
1967 gc_list = dst->next;
1968 dst_free(dst);
1969 }
1970 }
1971
1972 static int unused_bundle(struct dst_entry *dst)
1973 {
1974 return !atomic_read(&dst->__refcnt);
1975 }
1976
1977 static void __xfrm_garbage_collect(void)
1978 {
1979 xfrm_prune_bundles(unused_bundle);
1980 }
1981
1982 static int xfrm_flush_bundles(void)
1983 {
1984 xfrm_prune_bundles(stale_bundle);
1985 return 0;
1986 }
1987
1988 void xfrm_init_pmtu(struct dst_entry *dst)
1989 {
1990 do {
1991 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1992 u32 pmtu, route_mtu_cached;
1993
1994 pmtu = dst_mtu(dst->child);
1995 xdst->child_mtu_cached = pmtu;
1996
1997 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
1998
1999 route_mtu_cached = dst_mtu(xdst->route);
2000 xdst->route_mtu_cached = route_mtu_cached;
2001
2002 if (pmtu > route_mtu_cached)
2003 pmtu = route_mtu_cached;
2004
2005 dst->metrics[RTAX_MTU-1] = pmtu;
2006 } while ((dst = dst->next));
2007 }
2008
2009 EXPORT_SYMBOL(xfrm_init_pmtu);
2010
2011 /* Check that the bundle accepts the flow and its components are
2012 * still valid.
2013 */
2014
2015 int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first,
2016 struct flowi *fl, int family, int strict)
2017 {
2018 struct dst_entry *dst = &first->u.dst;
2019 struct xfrm_dst *last;
2020 u32 mtu;
2021
2022 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
2023 (dst->dev && !netif_running(dst->dev)))
2024 return 0;
2025 #ifdef CONFIG_XFRM_SUB_POLICY
2026 if (fl) {
2027 if (first->origin && !flow_cache_uli_match(first->origin, fl))
2028 return 0;
2029 if (first->partner &&
2030 !xfrm_selector_match(first->partner, fl, family))
2031 return 0;
2032 }
2033 #endif
2034
2035 last = NULL;
2036
2037 do {
2038 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2039
2040 if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family))
2041 return 0;
2042 if (fl && pol &&
2043 !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl))
2044 return 0;
2045 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2046 return 0;
2047 if (xdst->genid != dst->xfrm->genid)
2048 return 0;
2049
2050 if (strict && fl && dst->xfrm->props.mode != XFRM_MODE_TUNNEL &&
2051 !xfrm_state_addr_flow_check(dst->xfrm, fl, family))
2052 return 0;
2053
2054 mtu = dst_mtu(dst->child);
2055 if (xdst->child_mtu_cached != mtu) {
2056 last = xdst;
2057 xdst->child_mtu_cached = mtu;
2058 }
2059
2060 if (!dst_check(xdst->route, xdst->route_cookie))
2061 return 0;
2062 mtu = dst_mtu(xdst->route);
2063 if (xdst->route_mtu_cached != mtu) {
2064 last = xdst;
2065 xdst->route_mtu_cached = mtu;
2066 }
2067
2068 dst = dst->child;
2069 } while (dst->xfrm);
2070
2071 if (likely(!last))
2072 return 1;
2073
2074 mtu = last->child_mtu_cached;
2075 for (;;) {
2076 dst = &last->u.dst;
2077
2078 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2079 if (mtu > last->route_mtu_cached)
2080 mtu = last->route_mtu_cached;
2081 dst->metrics[RTAX_MTU-1] = mtu;
2082
2083 if (last == first)
2084 break;
2085
2086 last = last->u.next;
2087 last->child_mtu_cached = mtu;
2088 }
2089
2090 return 1;
2091 }
2092
2093 EXPORT_SYMBOL(xfrm_bundle_ok);
2094
2095 #ifdef CONFIG_AUDITSYSCALL
2096 /* Audit addition and deletion of SAs and ipsec policy */
2097
2098 void xfrm_audit_log(uid_t auid, u32 sid, int type, int result,
2099 struct xfrm_policy *xp, struct xfrm_state *x)
2100 {
2101
2102 char *secctx;
2103 u32 secctx_len;
2104 struct xfrm_sec_ctx *sctx = NULL;
2105 struct audit_buffer *audit_buf;
2106 int family;
2107 extern int audit_enabled;
2108
2109 if (audit_enabled == 0)
2110 return;
2111
2112 BUG_ON((type == AUDIT_MAC_IPSEC_ADDSA ||
2113 type == AUDIT_MAC_IPSEC_DELSA) && !x);
2114 BUG_ON((type == AUDIT_MAC_IPSEC_ADDSPD ||
2115 type == AUDIT_MAC_IPSEC_DELSPD) && !xp);
2116
2117 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, type);
2118 if (audit_buf == NULL)
2119 return;
2120
2121 switch(type) {
2122 case AUDIT_MAC_IPSEC_ADDSA:
2123 audit_log_format(audit_buf, "SAD add: auid=%u", auid);
2124 break;
2125 case AUDIT_MAC_IPSEC_DELSA:
2126 audit_log_format(audit_buf, "SAD delete: auid=%u", auid);
2127 break;
2128 case AUDIT_MAC_IPSEC_ADDSPD:
2129 audit_log_format(audit_buf, "SPD add: auid=%u", auid);
2130 break;
2131 case AUDIT_MAC_IPSEC_DELSPD:
2132 audit_log_format(audit_buf, "SPD delete: auid=%u", auid);
2133 break;
2134 default:
2135 return;
2136 }
2137
2138 if (sid != 0 &&
2139 security_secid_to_secctx(sid, &secctx, &secctx_len) == 0)
2140 audit_log_format(audit_buf, " subj=%s", secctx);
2141 else
2142 audit_log_task_context(audit_buf);
2143
2144 if (xp) {
2145 family = xp->selector.family;
2146 if (xp->security)
2147 sctx = xp->security;
2148 } else {
2149 family = x->props.family;
2150 if (x->security)
2151 sctx = x->security;
2152 }
2153
2154 if (sctx)
2155 audit_log_format(audit_buf,
2156 " sec_alg=%u sec_doi=%u sec_obj=%s",
2157 sctx->ctx_alg, sctx->ctx_doi, sctx->ctx_str);
2158
2159 switch(family) {
2160 case AF_INET:
2161 {
2162 struct in_addr saddr, daddr;
2163 if (xp) {
2164 saddr.s_addr = xp->selector.saddr.a4;
2165 daddr.s_addr = xp->selector.daddr.a4;
2166 } else {
2167 saddr.s_addr = x->props.saddr.a4;
2168 daddr.s_addr = x->id.daddr.a4;
2169 }
2170 audit_log_format(audit_buf,
2171 " src=%u.%u.%u.%u dst=%u.%u.%u.%u",
2172 NIPQUAD(saddr), NIPQUAD(daddr));
2173 }
2174 break;
2175 case AF_INET6:
2176 {
2177 struct in6_addr saddr6, daddr6;
2178 if (xp) {
2179 memcpy(&saddr6, xp->selector.saddr.a6,
2180 sizeof(struct in6_addr));
2181 memcpy(&daddr6, xp->selector.daddr.a6,
2182 sizeof(struct in6_addr));
2183 } else {
2184 memcpy(&saddr6, x->props.saddr.a6,
2185 sizeof(struct in6_addr));
2186 memcpy(&daddr6, x->id.daddr.a6,
2187 sizeof(struct in6_addr));
2188 }
2189 audit_log_format(audit_buf,
2190 " src=" NIP6_FMT " dst=" NIP6_FMT,
2191 NIP6(saddr6), NIP6(daddr6));
2192 }
2193 break;
2194 }
2195
2196 if (x)
2197 audit_log_format(audit_buf, " spi=%lu(0x%lx) protocol=%s",
2198 (unsigned long)ntohl(x->id.spi),
2199 (unsigned long)ntohl(x->id.spi),
2200 x->id.proto == IPPROTO_AH ? "AH" :
2201 (x->id.proto == IPPROTO_ESP ?
2202 "ESP" : "IPCOMP"));
2203
2204 audit_log_format(audit_buf, " res=%u", result);
2205 audit_log_end(audit_buf);
2206 }
2207
2208 EXPORT_SYMBOL(xfrm_audit_log);
2209 #endif /* CONFIG_AUDITSYSCALL */
2210
2211 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
2212 {
2213 int err = 0;
2214 if (unlikely(afinfo == NULL))
2215 return -EINVAL;
2216 if (unlikely(afinfo->family >= NPROTO))
2217 return -EAFNOSUPPORT;
2218 write_lock_bh(&xfrm_policy_afinfo_lock);
2219 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
2220 err = -ENOBUFS;
2221 else {
2222 struct dst_ops *dst_ops = afinfo->dst_ops;
2223 if (likely(dst_ops->kmem_cachep == NULL))
2224 dst_ops->kmem_cachep = xfrm_dst_cache;
2225 if (likely(dst_ops->check == NULL))
2226 dst_ops->check = xfrm_dst_check;
2227 if (likely(dst_ops->negative_advice == NULL))
2228 dst_ops->negative_advice = xfrm_negative_advice;
2229 if (likely(dst_ops->link_failure == NULL))
2230 dst_ops->link_failure = xfrm_link_failure;
2231 if (likely(afinfo->garbage_collect == NULL))
2232 afinfo->garbage_collect = __xfrm_garbage_collect;
2233 xfrm_policy_afinfo[afinfo->family] = afinfo;
2234 }
2235 write_unlock_bh(&xfrm_policy_afinfo_lock);
2236 return err;
2237 }
2238 EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2239
2240 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2241 {
2242 int err = 0;
2243 if (unlikely(afinfo == NULL))
2244 return -EINVAL;
2245 if (unlikely(afinfo->family >= NPROTO))
2246 return -EAFNOSUPPORT;
2247 write_lock_bh(&xfrm_policy_afinfo_lock);
2248 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2249 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2250 err = -EINVAL;
2251 else {
2252 struct dst_ops *dst_ops = afinfo->dst_ops;
2253 xfrm_policy_afinfo[afinfo->family] = NULL;
2254 dst_ops->kmem_cachep = NULL;
2255 dst_ops->check = NULL;
2256 dst_ops->negative_advice = NULL;
2257 dst_ops->link_failure = NULL;
2258 afinfo->garbage_collect = NULL;
2259 }
2260 }
2261 write_unlock_bh(&xfrm_policy_afinfo_lock);
2262 return err;
2263 }
2264 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2265
2266 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
2267 {
2268 struct xfrm_policy_afinfo *afinfo;
2269 if (unlikely(family >= NPROTO))
2270 return NULL;
2271 read_lock(&xfrm_policy_afinfo_lock);
2272 afinfo = xfrm_policy_afinfo[family];
2273 if (unlikely(!afinfo))
2274 read_unlock(&xfrm_policy_afinfo_lock);
2275 return afinfo;
2276 }
2277
2278 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
2279 {
2280 read_unlock(&xfrm_policy_afinfo_lock);
2281 }
2282
2283 static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family)
2284 {
2285 struct xfrm_policy_afinfo *afinfo;
2286 if (unlikely(family >= NPROTO))
2287 return NULL;
2288 write_lock_bh(&xfrm_policy_afinfo_lock);
2289 afinfo = xfrm_policy_afinfo[family];
2290 if (unlikely(!afinfo))
2291 write_unlock_bh(&xfrm_policy_afinfo_lock);
2292 return afinfo;
2293 }
2294
2295 static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo)
2296 {
2297 write_unlock_bh(&xfrm_policy_afinfo_lock);
2298 }
2299
2300 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2301 {
2302 switch (event) {
2303 case NETDEV_DOWN:
2304 xfrm_flush_bundles();
2305 }
2306 return NOTIFY_DONE;
2307 }
2308
2309 static struct notifier_block xfrm_dev_notifier = {
2310 xfrm_dev_event,
2311 NULL,
2312 0
2313 };
2314
2315 static void __init xfrm_policy_init(void)
2316 {
2317 unsigned int hmask, sz;
2318 int dir;
2319
2320 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
2321 sizeof(struct xfrm_dst),
2322 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
2323 NULL, NULL);
2324
2325 hmask = 8 - 1;
2326 sz = (hmask+1) * sizeof(struct hlist_head);
2327
2328 xfrm_policy_byidx = xfrm_hash_alloc(sz);
2329 xfrm_idx_hmask = hmask;
2330 if (!xfrm_policy_byidx)
2331 panic("XFRM: failed to allocate byidx hash\n");
2332
2333 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2334 struct xfrm_policy_hash *htab;
2335
2336 INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]);
2337
2338 htab = &xfrm_policy_bydst[dir];
2339 htab->table = xfrm_hash_alloc(sz);
2340 htab->hmask = hmask;
2341 if (!htab->table)
2342 panic("XFRM: failed to allocate bydst hash\n");
2343 }
2344
2345 INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task);
2346 register_netdevice_notifier(&xfrm_dev_notifier);
2347 }
2348
2349 void __init xfrm_init(void)
2350 {
2351 xfrm_state_init();
2352 xfrm_policy_init();
2353 xfrm_input_init();
2354 }
2355
2356 #ifdef CONFIG_XFRM_MIGRATE
2357 static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp,
2358 struct xfrm_selector *sel_tgt)
2359 {
2360 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
2361 if (sel_tgt->family == sel_cmp->family &&
2362 xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr,
2363 sel_cmp->family) == 0 &&
2364 xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr,
2365 sel_cmp->family) == 0 &&
2366 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
2367 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
2368 return 1;
2369 }
2370 } else {
2371 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
2372 return 1;
2373 }
2374 }
2375 return 0;
2376 }
2377
2378 static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel,
2379 u8 dir, u8 type)
2380 {
2381 struct xfrm_policy *pol, *ret = NULL;
2382 struct hlist_node *entry;
2383 struct hlist_head *chain;
2384 u32 priority = ~0U;
2385
2386 read_lock_bh(&xfrm_policy_lock);
2387 chain = policy_hash_direct(&sel->daddr, &sel->saddr, sel->family, dir);
2388 hlist_for_each_entry(pol, entry, chain, bydst) {
2389 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2390 pol->type == type) {
2391 ret = pol;
2392 priority = ret->priority;
2393 break;
2394 }
2395 }
2396 chain = &xfrm_policy_inexact[dir];
2397 hlist_for_each_entry(pol, entry, chain, bydst) {
2398 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2399 pol->type == type &&
2400 pol->priority < priority) {
2401 ret = pol;
2402 break;
2403 }
2404 }
2405
2406 if (ret)
2407 xfrm_pol_hold(ret);
2408
2409 read_unlock_bh(&xfrm_policy_lock);
2410
2411 return ret;
2412 }
2413
2414 static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t)
2415 {
2416 int match = 0;
2417
2418 if (t->mode == m->mode && t->id.proto == m->proto &&
2419 (m->reqid == 0 || t->reqid == m->reqid)) {
2420 switch (t->mode) {
2421 case XFRM_MODE_TUNNEL:
2422 case XFRM_MODE_BEET:
2423 if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr,
2424 m->old_family) == 0 &&
2425 xfrm_addr_cmp(&t->saddr, &m->old_saddr,
2426 m->old_family) == 0) {
2427 match = 1;
2428 }
2429 break;
2430 case XFRM_MODE_TRANSPORT:
2431 /* in case of transport mode, template does not store
2432 any IP addresses, hence we just compare mode and
2433 protocol */
2434 match = 1;
2435 break;
2436 default:
2437 break;
2438 }
2439 }
2440 return match;
2441 }
2442
2443 /* update endpoint address(es) of template(s) */
2444 static int xfrm_policy_migrate(struct xfrm_policy *pol,
2445 struct xfrm_migrate *m, int num_migrate)
2446 {
2447 struct xfrm_migrate *mp;
2448 struct dst_entry *dst;
2449 int i, j, n = 0;
2450
2451 write_lock_bh(&pol->lock);
2452 if (unlikely(pol->dead)) {
2453 /* target policy has been deleted */
2454 write_unlock_bh(&pol->lock);
2455 return -ENOENT;
2456 }
2457
2458 for (i = 0; i < pol->xfrm_nr; i++) {
2459 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
2460 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
2461 continue;
2462 n++;
2463 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL)
2464 continue;
2465 /* update endpoints */
2466 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
2467 sizeof(pol->xfrm_vec[i].id.daddr));
2468 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
2469 sizeof(pol->xfrm_vec[i].saddr));
2470 pol->xfrm_vec[i].encap_family = mp->new_family;
2471 /* flush bundles */
2472 while ((dst = pol->bundles) != NULL) {
2473 pol->bundles = dst->next;
2474 dst_free(dst);
2475 }
2476 }
2477 }
2478
2479 write_unlock_bh(&pol->lock);
2480
2481 if (!n)
2482 return -ENODATA;
2483
2484 return 0;
2485 }
2486
2487 static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate)
2488 {
2489 int i, j;
2490
2491 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
2492 return -EINVAL;
2493
2494 for (i = 0; i < num_migrate; i++) {
2495 if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr,
2496 m[i].old_family) == 0) &&
2497 (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr,
2498 m[i].old_family) == 0))
2499 return -EINVAL;
2500 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
2501 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
2502 return -EINVAL;
2503
2504 /* check if there is any duplicated entry */
2505 for (j = i + 1; j < num_migrate; j++) {
2506 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
2507 sizeof(m[i].old_daddr)) &&
2508 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
2509 sizeof(m[i].old_saddr)) &&
2510 m[i].proto == m[j].proto &&
2511 m[i].mode == m[j].mode &&
2512 m[i].reqid == m[j].reqid &&
2513 m[i].old_family == m[j].old_family)
2514 return -EINVAL;
2515 }
2516 }
2517
2518 return 0;
2519 }
2520
2521 int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
2522 struct xfrm_migrate *m, int num_migrate)
2523 {
2524 int i, err, nx_cur = 0, nx_new = 0;
2525 struct xfrm_policy *pol = NULL;
2526 struct xfrm_state *x, *xc;
2527 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
2528 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
2529 struct xfrm_migrate *mp;
2530
2531 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
2532 goto out;
2533
2534 /* Stage 1 - find policy */
2535 if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) {
2536 err = -ENOENT;
2537 goto out;
2538 }
2539
2540 /* Stage 2 - find and update state(s) */
2541 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
2542 if ((x = xfrm_migrate_state_find(mp))) {
2543 x_cur[nx_cur] = x;
2544 nx_cur++;
2545 if ((xc = xfrm_state_migrate(x, mp))) {
2546 x_new[nx_new] = xc;
2547 nx_new++;
2548 } else {
2549 err = -ENODATA;
2550 goto restore_state;
2551 }
2552 }
2553 }
2554
2555 /* Stage 3 - update policy */
2556 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
2557 goto restore_state;
2558
2559 /* Stage 4 - delete old state(s) */
2560 if (nx_cur) {
2561 xfrm_states_put(x_cur, nx_cur);
2562 xfrm_states_delete(x_cur, nx_cur);
2563 }
2564
2565 /* Stage 5 - announce */
2566 km_migrate(sel, dir, type, m, num_migrate);
2567
2568 xfrm_pol_put(pol);
2569
2570 return 0;
2571 out:
2572 return err;
2573
2574 restore_state:
2575 if (pol)
2576 xfrm_pol_put(pol);
2577 if (nx_cur)
2578 xfrm_states_put(x_cur, nx_cur);
2579 if (nx_new)
2580 xfrm_states_delete(x_new, nx_new);
2581
2582 return err;
2583 }
2584 EXPORT_SYMBOL(xfrm_migrate);
2585 #endif
2586
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