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Revert "Fix very high interrupt rate for IRQ8 (rtc) unless pnpacpi=off"
[pv_ops_mirror.git] / net / xfrm / xfrm_policy.c
blobb702bd8a3893b7f2471df1c23df25a7105da70da
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
29 #include "xfrm_hash.h"
30
31 int sysctl_xfrm_larval_drop __read_mostly;
32
33 DEFINE_MUTEX(xfrm_cfg_mutex);
34 EXPORT_SYMBOL(xfrm_cfg_mutex);
35
36 static DEFINE_RWLOCK(xfrm_policy_lock);
37
38 unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
39 EXPORT_SYMBOL(xfrm_policy_count);
40
41 static DEFINE_RWLOCK(xfrm_policy_afinfo_lock);
42 static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO];
43
44 static struct kmem_cache *xfrm_dst_cache __read_mostly;
45
46 static struct work_struct xfrm_policy_gc_work;
47 static HLIST_HEAD(xfrm_policy_gc_list);
48 static DEFINE_SPINLOCK(xfrm_policy_gc_lock);
49
50 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family);
51 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo);
52
53 static inline int
54 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
55 {
56 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
57 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
58 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
59 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
60 (fl->proto == sel->proto || !sel->proto) &&
61 (fl->oif == sel->ifindex || !sel->ifindex);
62 }
63
64 static inline int
65 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
66 {
67 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
68 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
69 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
70 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
71 (fl->proto == sel->proto || !sel->proto) &&
72 (fl->oif == sel->ifindex || !sel->ifindex);
73 }
74
75 int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
76 unsigned short family)
77 {
78 switch (family) {
79 case AF_INET:
80 return __xfrm4_selector_match(sel, fl);
81 case AF_INET6:
82 return __xfrm6_selector_match(sel, fl);
83 }
84 return 0;
85 }
86
87 int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl,
88 unsigned short family)
89 {
90 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
91 int err = 0;
92
93 if (unlikely(afinfo == NULL))
94 return -EAFNOSUPPORT;
95
96 if (likely(afinfo->dst_lookup != NULL))
97 err = afinfo->dst_lookup(dst, fl);
98 else
99 err = -EINVAL;
100 xfrm_policy_put_afinfo(afinfo);
101 return err;
102 }
103 EXPORT_SYMBOL(xfrm_dst_lookup);
104
105 static inline unsigned long make_jiffies(long secs)
106 {
107 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
108 return MAX_SCHEDULE_TIMEOUT-1;
109 else
110 return secs*HZ;
111 }
112
113 static void xfrm_policy_timer(unsigned long data)
114 {
115 struct xfrm_policy *xp = (struct xfrm_policy*)data;
116 unsigned long now = get_seconds();
117 long next = LONG_MAX;
118 int warn = 0;
119 int dir;
120
121 read_lock(&xp->lock);
122
123 if (xp->dead)
124 goto out;
125
126 dir = xfrm_policy_id2dir(xp->index);
127
128 if (xp->lft.hard_add_expires_seconds) {
129 long tmo = xp->lft.hard_add_expires_seconds +
130 xp->curlft.add_time - now;
131 if (tmo <= 0)
132 goto expired;
133 if (tmo < next)
134 next = tmo;
135 }
136 if (xp->lft.hard_use_expires_seconds) {
137 long tmo = xp->lft.hard_use_expires_seconds +
138 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
139 if (tmo <= 0)
140 goto expired;
141 if (tmo < next)
142 next = tmo;
143 }
144 if (xp->lft.soft_add_expires_seconds) {
145 long tmo = xp->lft.soft_add_expires_seconds +
146 xp->curlft.add_time - now;
147 if (tmo <= 0) {
148 warn = 1;
149 tmo = XFRM_KM_TIMEOUT;
150 }
151 if (tmo < next)
152 next = tmo;
153 }
154 if (xp->lft.soft_use_expires_seconds) {
155 long tmo = xp->lft.soft_use_expires_seconds +
156 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
157 if (tmo <= 0) {
158 warn = 1;
159 tmo = XFRM_KM_TIMEOUT;
160 }
161 if (tmo < next)
162 next = tmo;
163 }
164
165 if (warn)
166 km_policy_expired(xp, dir, 0, 0);
167 if (next != LONG_MAX &&
168 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
169 xfrm_pol_hold(xp);
170
171 out:
172 read_unlock(&xp->lock);
173 xfrm_pol_put(xp);
174 return;
175
176 expired:
177 read_unlock(&xp->lock);
178 if (!xfrm_policy_delete(xp, dir))
179 km_policy_expired(xp, dir, 1, 0);
180 xfrm_pol_put(xp);
181 }
182
183
184 /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
185 * SPD calls.
186 */
187
188 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp)
189 {
190 struct xfrm_policy *policy;
191
192 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
193
194 if (policy) {
195 INIT_HLIST_NODE(&policy->bydst);
196 INIT_HLIST_NODE(&policy->byidx);
197 rwlock_init(&policy->lock);
198 atomic_set(&policy->refcnt, 1);
199 init_timer(&policy->timer);
200 policy->timer.data = (unsigned long)policy;
201 policy->timer.function = xfrm_policy_timer;
202 }
203 return policy;
204 }
205 EXPORT_SYMBOL(xfrm_policy_alloc);
206
207 /* Destroy xfrm_policy: descendant resources must be released to this moment. */
208
209 void __xfrm_policy_destroy(struct xfrm_policy *policy)
210 {
211 BUG_ON(!policy->dead);
212
213 BUG_ON(policy->bundles);
214
215 if (del_timer(&policy->timer))
216 BUG();
217
218 security_xfrm_policy_free(policy);
219 kfree(policy);
220 }
221 EXPORT_SYMBOL(__xfrm_policy_destroy);
222
223 static void xfrm_policy_gc_kill(struct xfrm_policy *policy)
224 {
225 struct dst_entry *dst;
226
227 while ((dst = policy->bundles) != NULL) {
228 policy->bundles = dst->next;
229 dst_free(dst);
230 }
231
232 if (del_timer(&policy->timer))
233 atomic_dec(&policy->refcnt);
234
235 if (atomic_read(&policy->refcnt) > 1)
236 flow_cache_flush();
237
238 xfrm_pol_put(policy);
239 }
240
241 static void xfrm_policy_gc_task(struct work_struct *work)
242 {
243 struct xfrm_policy *policy;
244 struct hlist_node *entry, *tmp;
245 struct hlist_head gc_list;
246
247 spin_lock_bh(&xfrm_policy_gc_lock);
248 gc_list.first = xfrm_policy_gc_list.first;
249 INIT_HLIST_HEAD(&xfrm_policy_gc_list);
250 spin_unlock_bh(&xfrm_policy_gc_lock);
251
252 hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst)
253 xfrm_policy_gc_kill(policy);
254 }
255
256 /* Rule must be locked. Release descentant resources, announce
257 * entry dead. The rule must be unlinked from lists to the moment.
258 */
259
260 static void xfrm_policy_kill(struct xfrm_policy *policy)
261 {
262 int dead;
263
264 write_lock_bh(&policy->lock);
265 dead = policy->dead;
266 policy->dead = 1;
267 write_unlock_bh(&policy->lock);
268
269 if (unlikely(dead)) {
270 WARN_ON(1);
271 return;
272 }
273
274 spin_lock(&xfrm_policy_gc_lock);
275 hlist_add_head(&policy->bydst, &xfrm_policy_gc_list);
276 spin_unlock(&xfrm_policy_gc_lock);
277
278 schedule_work(&xfrm_policy_gc_work);
279 }
280
281 struct xfrm_policy_hash {
282 struct hlist_head *table;
283 unsigned int hmask;
284 };
285
286 static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2];
287 static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly;
288 static struct hlist_head *xfrm_policy_byidx __read_mostly;
289 static unsigned int xfrm_idx_hmask __read_mostly;
290 static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
291
292 static inline unsigned int idx_hash(u32 index)
293 {
294 return __idx_hash(index, xfrm_idx_hmask);
295 }
296
297 static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir)
298 {
299 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
300 unsigned int hash = __sel_hash(sel, family, hmask);
301
302 return (hash == hmask + 1 ?
303 &xfrm_policy_inexact[dir] :
304 xfrm_policy_bydst[dir].table + hash);
305 }
306
307 static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir)
308 {
309 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
310 unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
311
312 return xfrm_policy_bydst[dir].table + hash;
313 }
314
315 static void xfrm_dst_hash_transfer(struct hlist_head *list,
316 struct hlist_head *ndsttable,
317 unsigned int nhashmask)
318 {
319 struct hlist_node *entry, *tmp;
320 struct xfrm_policy *pol;
321
322 hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) {
323 unsigned int h;
324
325 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
326 pol->family, nhashmask);
327 hlist_add_head(&pol->bydst, ndsttable+h);
328 }
329 }
330
331 static void xfrm_idx_hash_transfer(struct hlist_head *list,
332 struct hlist_head *nidxtable,
333 unsigned int nhashmask)
334 {
335 struct hlist_node *entry, *tmp;
336 struct xfrm_policy *pol;
337
338 hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) {
339 unsigned int h;
340
341 h = __idx_hash(pol->index, nhashmask);
342 hlist_add_head(&pol->byidx, nidxtable+h);
343 }
344 }
345
346 static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
347 {
348 return ((old_hmask + 1) << 1) - 1;
349 }
350
351 static void xfrm_bydst_resize(int dir)
352 {
353 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
354 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
355 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
356 struct hlist_head *odst = xfrm_policy_bydst[dir].table;
357 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
358 int i;
359
360 if (!ndst)
361 return;
362
363 write_lock_bh(&xfrm_policy_lock);
364
365 for (i = hmask; i >= 0; i--)
366 xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
367
368 xfrm_policy_bydst[dir].table = ndst;
369 xfrm_policy_bydst[dir].hmask = nhashmask;
370
371 write_unlock_bh(&xfrm_policy_lock);
372
373 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
374 }
375
376 static void xfrm_byidx_resize(int total)
377 {
378 unsigned int hmask = xfrm_idx_hmask;
379 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
380 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
381 struct hlist_head *oidx = xfrm_policy_byidx;
382 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
383 int i;
384
385 if (!nidx)
386 return;
387
388 write_lock_bh(&xfrm_policy_lock);
389
390 for (i = hmask; i >= 0; i--)
391 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
392
393 xfrm_policy_byidx = nidx;
394 xfrm_idx_hmask = nhashmask;
395
396 write_unlock_bh(&xfrm_policy_lock);
397
398 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
399 }
400
401 static inline int xfrm_bydst_should_resize(int dir, int *total)
402 {
403 unsigned int cnt = xfrm_policy_count[dir];
404 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
405
406 if (total)
407 *total += cnt;
408
409 if ((hmask + 1) < xfrm_policy_hashmax &&
410 cnt > hmask)
411 return 1;
412
413 return 0;
414 }
415
416 static inline int xfrm_byidx_should_resize(int total)
417 {
418 unsigned int hmask = xfrm_idx_hmask;
419
420 if ((hmask + 1) < xfrm_policy_hashmax &&
421 total > hmask)
422 return 1;
423
424 return 0;
425 }
426
427 void xfrm_spd_getinfo(struct xfrmk_spdinfo *si)
428 {
429 read_lock_bh(&xfrm_policy_lock);
430 si->incnt = xfrm_policy_count[XFRM_POLICY_IN];
431 si->outcnt = xfrm_policy_count[XFRM_POLICY_OUT];
432 si->fwdcnt = xfrm_policy_count[XFRM_POLICY_FWD];
433 si->inscnt = xfrm_policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
434 si->outscnt = xfrm_policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
435 si->fwdscnt = xfrm_policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
436 si->spdhcnt = xfrm_idx_hmask;
437 si->spdhmcnt = xfrm_policy_hashmax;
438 read_unlock_bh(&xfrm_policy_lock);
439 }
440 EXPORT_SYMBOL(xfrm_spd_getinfo);
441
442 static DEFINE_MUTEX(hash_resize_mutex);
443 static void xfrm_hash_resize(struct work_struct *__unused)
444 {
445 int dir, total;
446
447 mutex_lock(&hash_resize_mutex);
448
449 total = 0;
450 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
451 if (xfrm_bydst_should_resize(dir, &total))
452 xfrm_bydst_resize(dir);
453 }
454 if (xfrm_byidx_should_resize(total))
455 xfrm_byidx_resize(total);
456
457 mutex_unlock(&hash_resize_mutex);
458 }
459
460 static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize);
461
462 /* Generate new index... KAME seems to generate them ordered by cost
463 * of an absolute inpredictability of ordering of rules. This will not pass. */
464 static u32 xfrm_gen_index(u8 type, int dir)
465 {
466 static u32 idx_generator;
467
468 for (;;) {
469 struct hlist_node *entry;
470 struct hlist_head *list;
471 struct xfrm_policy *p;
472 u32 idx;
473 int found;
474
475 idx = (idx_generator | dir);
476 idx_generator += 8;
477 if (idx == 0)
478 idx = 8;
479 list = xfrm_policy_byidx + idx_hash(idx);
480 found = 0;
481 hlist_for_each_entry(p, entry, list, byidx) {
482 if (p->index == idx) {
483 found = 1;
484 break;
485 }
486 }
487 if (!found)
488 return idx;
489 }
490 }
491
492 static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
493 {
494 u32 *p1 = (u32 *) s1;
495 u32 *p2 = (u32 *) s2;
496 int len = sizeof(struct xfrm_selector) / sizeof(u32);
497 int i;
498
499 for (i = 0; i < len; i++) {
500 if (p1[i] != p2[i])
501 return 1;
502 }
503
504 return 0;
505 }
506
507 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
508 {
509 struct xfrm_policy *pol;
510 struct xfrm_policy *delpol;
511 struct hlist_head *chain;
512 struct hlist_node *entry, *newpos;
513 struct dst_entry *gc_list;
514
515 write_lock_bh(&xfrm_policy_lock);
516 chain = policy_hash_bysel(&policy->selector, policy->family, dir);
517 delpol = NULL;
518 newpos = NULL;
519 hlist_for_each_entry(pol, entry, chain, bydst) {
520 if (pol->type == policy->type &&
521 !selector_cmp(&pol->selector, &policy->selector) &&
522 xfrm_sec_ctx_match(pol->security, policy->security) &&
523 !WARN_ON(delpol)) {
524 if (excl) {
525 write_unlock_bh(&xfrm_policy_lock);
526 return -EEXIST;
527 }
528 delpol = pol;
529 if (policy->priority > pol->priority)
530 continue;
531 } else if (policy->priority >= pol->priority) {
532 newpos = &pol->bydst;
533 continue;
534 }
535 if (delpol)
536 break;
537 }
538 if (newpos)
539 hlist_add_after(newpos, &policy->bydst);
540 else
541 hlist_add_head(&policy->bydst, chain);
542 xfrm_pol_hold(policy);
543 xfrm_policy_count[dir]++;
544 atomic_inc(&flow_cache_genid);
545 if (delpol) {
546 hlist_del(&delpol->bydst);
547 hlist_del(&delpol->byidx);
548 xfrm_policy_count[dir]--;
549 }
550 policy->index = delpol ? delpol->index : xfrm_gen_index(policy->type, dir);
551 hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index));
552 policy->curlft.add_time = get_seconds();
553 policy->curlft.use_time = 0;
554 if (!mod_timer(&policy->timer, jiffies + HZ))
555 xfrm_pol_hold(policy);
556 write_unlock_bh(&xfrm_policy_lock);
557
558 if (delpol)
559 xfrm_policy_kill(delpol);
560 else if (xfrm_bydst_should_resize(dir, NULL))
561 schedule_work(&xfrm_hash_work);
562
563 read_lock_bh(&xfrm_policy_lock);
564 gc_list = NULL;
565 entry = &policy->bydst;
566 hlist_for_each_entry_continue(policy, entry, bydst) {
567 struct dst_entry *dst;
568
569 write_lock(&policy->lock);
570 dst = policy->bundles;
571 if (dst) {
572 struct dst_entry *tail = dst;
573 while (tail->next)
574 tail = tail->next;
575 tail->next = gc_list;
576 gc_list = dst;
577
578 policy->bundles = NULL;
579 }
580 write_unlock(&policy->lock);
581 }
582 read_unlock_bh(&xfrm_policy_lock);
583
584 while (gc_list) {
585 struct dst_entry *dst = gc_list;
586
587 gc_list = dst->next;
588 dst_free(dst);
589 }
590
591 return 0;
592 }
593 EXPORT_SYMBOL(xfrm_policy_insert);
594
595 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
596 struct xfrm_selector *sel,
597 struct xfrm_sec_ctx *ctx, int delete,
598 int *err)
599 {
600 struct xfrm_policy *pol, *ret;
601 struct hlist_head *chain;
602 struct hlist_node *entry;
603
604 *err = 0;
605 write_lock_bh(&xfrm_policy_lock);
606 chain = policy_hash_bysel(sel, sel->family, dir);
607 ret = NULL;
608 hlist_for_each_entry(pol, entry, chain, bydst) {
609 if (pol->type == type &&
610 !selector_cmp(sel, &pol->selector) &&
611 xfrm_sec_ctx_match(ctx, pol->security)) {
612 xfrm_pol_hold(pol);
613 if (delete) {
614 *err = security_xfrm_policy_delete(pol);
615 if (*err) {
616 write_unlock_bh(&xfrm_policy_lock);
617 return pol;
618 }
619 hlist_del(&pol->bydst);
620 hlist_del(&pol->byidx);
621 xfrm_policy_count[dir]--;
622 }
623 ret = pol;
624 break;
625 }
626 }
627 write_unlock_bh(&xfrm_policy_lock);
628
629 if (ret && delete) {
630 atomic_inc(&flow_cache_genid);
631 xfrm_policy_kill(ret);
632 }
633 return ret;
634 }
635 EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
636
637 struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete,
638 int *err)
639 {
640 struct xfrm_policy *pol, *ret;
641 struct hlist_head *chain;
642 struct hlist_node *entry;
643
644 *err = -ENOENT;
645 if (xfrm_policy_id2dir(id) != dir)
646 return NULL;
647
648 *err = 0;
649 write_lock_bh(&xfrm_policy_lock);
650 chain = xfrm_policy_byidx + idx_hash(id);
651 ret = NULL;
652 hlist_for_each_entry(pol, entry, chain, byidx) {
653 if (pol->type == type && pol->index == id) {
654 xfrm_pol_hold(pol);
655 if (delete) {
656 *err = security_xfrm_policy_delete(pol);
657 if (*err) {
658 write_unlock_bh(&xfrm_policy_lock);
659 return pol;
660 }
661 hlist_del(&pol->bydst);
662 hlist_del(&pol->byidx);
663 xfrm_policy_count[dir]--;
664 }
665 ret = pol;
666 break;
667 }
668 }
669 write_unlock_bh(&xfrm_policy_lock);
670
671 if (ret && delete) {
672 atomic_inc(&flow_cache_genid);
673 xfrm_policy_kill(ret);
674 }
675 return ret;
676 }
677 EXPORT_SYMBOL(xfrm_policy_byid);
678
679 #ifdef CONFIG_SECURITY_NETWORK_XFRM
680 static inline int
681 xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info)
682 {
683 int dir, err = 0;
684
685 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
686 struct xfrm_policy *pol;
687 struct hlist_node *entry;
688 int i;
689
690 hlist_for_each_entry(pol, entry,
691 &xfrm_policy_inexact[dir], bydst) {
692 if (pol->type != type)
693 continue;
694 err = security_xfrm_policy_delete(pol);
695 if (err) {
696 xfrm_audit_policy_delete(pol, 0,
697 audit_info->loginuid,
698 audit_info->secid);
699 return err;
700 }
701 }
702 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
703 hlist_for_each_entry(pol, entry,
704 xfrm_policy_bydst[dir].table + i,
705 bydst) {
706 if (pol->type != type)
707 continue;
708 err = security_xfrm_policy_delete(pol);
709 if (err) {
710 xfrm_audit_policy_delete(pol, 0,
711 audit_info->loginuid,
712 audit_info->secid);
713 return err;
714 }
715 }
716 }
717 }
718 return err;
719 }
720 #else
721 static inline int
722 xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info)
723 {
724 return 0;
725 }
726 #endif
727
728 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info)
729 {
730 int dir, err = 0;
731
732 write_lock_bh(&xfrm_policy_lock);
733
734 err = xfrm_policy_flush_secctx_check(type, audit_info);
735 if (err)
736 goto out;
737
738 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
739 struct xfrm_policy *pol;
740 struct hlist_node *entry;
741 int i, killed;
742
743 killed = 0;
744 again1:
745 hlist_for_each_entry(pol, entry,
746 &xfrm_policy_inexact[dir], bydst) {
747 if (pol->type != type)
748 continue;
749 hlist_del(&pol->bydst);
750 hlist_del(&pol->byidx);
751 write_unlock_bh(&xfrm_policy_lock);
752
753 xfrm_audit_policy_delete(pol, 1, audit_info->loginuid,
754 audit_info->secid);
755
756 xfrm_policy_kill(pol);
757 killed++;
758
759 write_lock_bh(&xfrm_policy_lock);
760 goto again1;
761 }
762
763 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
764 again2:
765 hlist_for_each_entry(pol, entry,
766 xfrm_policy_bydst[dir].table + i,
767 bydst) {
768 if (pol->type != type)
769 continue;
770 hlist_del(&pol->bydst);
771 hlist_del(&pol->byidx);
772 write_unlock_bh(&xfrm_policy_lock);
773
774 xfrm_audit_policy_delete(pol, 1,
775 audit_info->loginuid,
776 audit_info->secid);
777 xfrm_policy_kill(pol);
778 killed++;
779
780 write_lock_bh(&xfrm_policy_lock);
781 goto again2;
782 }
783 }
784
785 xfrm_policy_count[dir] -= killed;
786 }
787 atomic_inc(&flow_cache_genid);
788 out:
789 write_unlock_bh(&xfrm_policy_lock);
790 return err;
791 }
792 EXPORT_SYMBOL(xfrm_policy_flush);
793
794 int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*),
795 void *data)
796 {
797 struct xfrm_policy *pol, *last = NULL;
798 struct hlist_node *entry;
799 int dir, last_dir = 0, count, error;
800
801 read_lock_bh(&xfrm_policy_lock);
802 count = 0;
803
804 for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) {
805 struct hlist_head *table = xfrm_policy_bydst[dir].table;
806 int i;
807
808 hlist_for_each_entry(pol, entry,
809 &xfrm_policy_inexact[dir], bydst) {
810 if (pol->type != type)
811 continue;
812 if (last) {
813 error = func(last, last_dir % XFRM_POLICY_MAX,
814 count, data);
815 if (error)
816 goto out;
817 }
818 last = pol;
819 last_dir = dir;
820 count++;
821 }
822 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
823 hlist_for_each_entry(pol, entry, table + i, bydst) {
824 if (pol->type != type)
825 continue;
826 if (last) {
827 error = func(last, last_dir % XFRM_POLICY_MAX,
828 count, data);
829 if (error)
830 goto out;
831 }
832 last = pol;
833 last_dir = dir;
834 count++;
835 }
836 }
837 }
838 if (count == 0) {
839 error = -ENOENT;
840 goto out;
841 }
842 error = func(last, last_dir % XFRM_POLICY_MAX, 0, data);
843 out:
844 read_unlock_bh(&xfrm_policy_lock);
845 return error;
846 }
847 EXPORT_SYMBOL(xfrm_policy_walk);
848
849 /*
850 * Find policy to apply to this flow.
851 *
852 * Returns 0 if policy found, else an -errno.
853 */
854 static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl,
855 u8 type, u16 family, int dir)
856 {
857 struct xfrm_selector *sel = &pol->selector;
858 int match, ret = -ESRCH;
859
860 if (pol->family != family ||
861 pol->type != type)
862 return ret;
863
864 match = xfrm_selector_match(sel, fl, family);
865 if (match)
866 ret = security_xfrm_policy_lookup(pol, fl->secid, dir);
867
868 return ret;
869 }
870
871 static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl,
872 u16 family, u8 dir)
873 {
874 int err;
875 struct xfrm_policy *pol, *ret;
876 xfrm_address_t *daddr, *saddr;
877 struct hlist_node *entry;
878 struct hlist_head *chain;
879 u32 priority = ~0U;
880
881 daddr = xfrm_flowi_daddr(fl, family);
882 saddr = xfrm_flowi_saddr(fl, family);
883 if (unlikely(!daddr || !saddr))
884 return NULL;
885
886 read_lock_bh(&xfrm_policy_lock);
887 chain = policy_hash_direct(daddr, saddr, family, dir);
888 ret = NULL;
889 hlist_for_each_entry(pol, entry, chain, bydst) {
890 err = xfrm_policy_match(pol, fl, type, family, dir);
891 if (err) {
892 if (err == -ESRCH)
893 continue;
894 else {
895 ret = ERR_PTR(err);
896 goto fail;
897 }
898 } else {
899 ret = pol;
900 priority = ret->priority;
901 break;
902 }
903 }
904 chain = &xfrm_policy_inexact[dir];
905 hlist_for_each_entry(pol, entry, chain, bydst) {
906 err = xfrm_policy_match(pol, fl, type, family, dir);
907 if (err) {
908 if (err == -ESRCH)
909 continue;
910 else {
911 ret = ERR_PTR(err);
912 goto fail;
913 }
914 } else if (pol->priority < priority) {
915 ret = pol;
916 break;
917 }
918 }
919 if (ret)
920 xfrm_pol_hold(ret);
921 fail:
922 read_unlock_bh(&xfrm_policy_lock);
923
924 return ret;
925 }
926
927 static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir,
928 void **objp, atomic_t **obj_refp)
929 {
930 struct xfrm_policy *pol;
931 int err = 0;
932
933 #ifdef CONFIG_XFRM_SUB_POLICY
934 pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir);
935 if (IS_ERR(pol)) {
936 err = PTR_ERR(pol);
937 pol = NULL;
938 }
939 if (pol || err)
940 goto end;
941 #endif
942 pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir);
943 if (IS_ERR(pol)) {
944 err = PTR_ERR(pol);
945 pol = NULL;
946 }
947 #ifdef CONFIG_XFRM_SUB_POLICY
948 end:
949 #endif
950 if ((*objp = (void *) pol) != NULL)
951 *obj_refp = &pol->refcnt;
952 return err;
953 }
954
955 static inline int policy_to_flow_dir(int dir)
956 {
957 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
958 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
959 XFRM_POLICY_FWD == FLOW_DIR_FWD)
960 return dir;
961 switch (dir) {
962 default:
963 case XFRM_POLICY_IN:
964 return FLOW_DIR_IN;
965 case XFRM_POLICY_OUT:
966 return FLOW_DIR_OUT;
967 case XFRM_POLICY_FWD:
968 return FLOW_DIR_FWD;
969 }
970 }
971
972 static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl)
973 {
974 struct xfrm_policy *pol;
975
976 read_lock_bh(&xfrm_policy_lock);
977 if ((pol = sk->sk_policy[dir]) != NULL) {
978 int match = xfrm_selector_match(&pol->selector, fl,
979 sk->sk_family);
980 int err = 0;
981
982 if (match) {
983 err = security_xfrm_policy_lookup(pol, fl->secid,
984 policy_to_flow_dir(dir));
985 if (!err)
986 xfrm_pol_hold(pol);
987 else if (err == -ESRCH)
988 pol = NULL;
989 else
990 pol = ERR_PTR(err);
991 } else
992 pol = NULL;
993 }
994 read_unlock_bh(&xfrm_policy_lock);
995 return pol;
996 }
997
998 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
999 {
1000 struct hlist_head *chain = policy_hash_bysel(&pol->selector,
1001 pol->family, dir);
1002
1003 hlist_add_head(&pol->bydst, chain);
1004 hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index));
1005 xfrm_policy_count[dir]++;
1006 xfrm_pol_hold(pol);
1007
1008 if (xfrm_bydst_should_resize(dir, NULL))
1009 schedule_work(&xfrm_hash_work);
1010 }
1011
1012 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1013 int dir)
1014 {
1015 if (hlist_unhashed(&pol->bydst))
1016 return NULL;
1017
1018 hlist_del(&pol->bydst);
1019 hlist_del(&pol->byidx);
1020 xfrm_policy_count[dir]--;
1021
1022 return pol;
1023 }
1024
1025 int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1026 {
1027 write_lock_bh(&xfrm_policy_lock);
1028 pol = __xfrm_policy_unlink(pol, dir);
1029 write_unlock_bh(&xfrm_policy_lock);
1030 if (pol) {
1031 if (dir < XFRM_POLICY_MAX)
1032 atomic_inc(&flow_cache_genid);
1033 xfrm_policy_kill(pol);
1034 return 0;
1035 }
1036 return -ENOENT;
1037 }
1038 EXPORT_SYMBOL(xfrm_policy_delete);
1039
1040 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1041 {
1042 struct xfrm_policy *old_pol;
1043
1044 #ifdef CONFIG_XFRM_SUB_POLICY
1045 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1046 return -EINVAL;
1047 #endif
1048
1049 write_lock_bh(&xfrm_policy_lock);
1050 old_pol = sk->sk_policy[dir];
1051 sk->sk_policy[dir] = pol;
1052 if (pol) {
1053 pol->curlft.add_time = get_seconds();
1054 pol->index = xfrm_gen_index(pol->type, XFRM_POLICY_MAX+dir);
1055 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
1056 }
1057 if (old_pol)
1058 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
1059 write_unlock_bh(&xfrm_policy_lock);
1060
1061 if (old_pol) {
1062 xfrm_policy_kill(old_pol);
1063 }
1064 return 0;
1065 }
1066
1067 static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir)
1068 {
1069 struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC);
1070
1071 if (newp) {
1072 newp->selector = old->selector;
1073 if (security_xfrm_policy_clone(old, newp)) {
1074 kfree(newp);
1075 return NULL; /* ENOMEM */
1076 }
1077 newp->lft = old->lft;
1078 newp->curlft = old->curlft;
1079 newp->action = old->action;
1080 newp->flags = old->flags;
1081 newp->xfrm_nr = old->xfrm_nr;
1082 newp->index = old->index;
1083 newp->type = old->type;
1084 memcpy(newp->xfrm_vec, old->xfrm_vec,
1085 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1086 write_lock_bh(&xfrm_policy_lock);
1087 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
1088 write_unlock_bh(&xfrm_policy_lock);
1089 xfrm_pol_put(newp);
1090 }
1091 return newp;
1092 }
1093
1094 int __xfrm_sk_clone_policy(struct sock *sk)
1095 {
1096 struct xfrm_policy *p0 = sk->sk_policy[0],
1097 *p1 = sk->sk_policy[1];
1098
1099 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1100 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1101 return -ENOMEM;
1102 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1103 return -ENOMEM;
1104 return 0;
1105 }
1106
1107 static int
1108 xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote,
1109 unsigned short family)
1110 {
1111 int err;
1112 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1113
1114 if (unlikely(afinfo == NULL))
1115 return -EINVAL;
1116 err = afinfo->get_saddr(local, remote);
1117 xfrm_policy_put_afinfo(afinfo);
1118 return err;
1119 }
1120
1121 /* Resolve list of templates for the flow, given policy. */
1122
1123 static int
1124 xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl,
1125 struct xfrm_state **xfrm,
1126 unsigned short family)
1127 {
1128 int nx;
1129 int i, error;
1130 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1131 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
1132 xfrm_address_t tmp;
1133
1134 for (nx=0, i = 0; i < policy->xfrm_nr; i++) {
1135 struct xfrm_state *x;
1136 xfrm_address_t *remote = daddr;
1137 xfrm_address_t *local = saddr;
1138 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1139
1140 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1141 tmpl->mode == XFRM_MODE_BEET) {
1142 remote = &tmpl->id.daddr;
1143 local = &tmpl->saddr;
1144 family = tmpl->encap_family;
1145 if (xfrm_addr_any(local, family)) {
1146 error = xfrm_get_saddr(&tmp, remote, family);
1147 if (error)
1148 goto fail;
1149 local = &tmp;
1150 }
1151 }
1152
1153 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1154
1155 if (x && x->km.state == XFRM_STATE_VALID) {
1156 xfrm[nx++] = x;
1157 daddr = remote;
1158 saddr = local;
1159 continue;
1160 }
1161 if (x) {
1162 error = (x->km.state == XFRM_STATE_ERROR ?
1163 -EINVAL : -EAGAIN);
1164 xfrm_state_put(x);
1165 }
1166
1167 if (!tmpl->optional)
1168 goto fail;
1169 }
1170 return nx;
1171
1172 fail:
1173 for (nx--; nx>=0; nx--)
1174 xfrm_state_put(xfrm[nx]);
1175 return error;
1176 }
1177
1178 static int
1179 xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl,
1180 struct xfrm_state **xfrm,
1181 unsigned short family)
1182 {
1183 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1184 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
1185 int cnx = 0;
1186 int error;
1187 int ret;
1188 int i;
1189
1190 for (i = 0; i < npols; i++) {
1191 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1192 error = -ENOBUFS;
1193 goto fail;
1194 }
1195
1196 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
1197 if (ret < 0) {
1198 error = ret;
1199 goto fail;
1200 } else
1201 cnx += ret;
1202 }
1203
1204 /* found states are sorted for outbound processing */
1205 if (npols > 1)
1206 xfrm_state_sort(xfrm, tpp, cnx, family);
1207
1208 return cnx;
1209
1210 fail:
1211 for (cnx--; cnx>=0; cnx--)
1212 xfrm_state_put(tpp[cnx]);
1213 return error;
1214
1215 }
1216
1217 /* Check that the bundle accepts the flow and its components are
1218 * still valid.
1219 */
1220
1221 static struct dst_entry *
1222 xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family)
1223 {
1224 struct dst_entry *x;
1225 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1226 if (unlikely(afinfo == NULL))
1227 return ERR_PTR(-EINVAL);
1228 x = afinfo->find_bundle(fl, policy);
1229 xfrm_policy_put_afinfo(afinfo);
1230 return x;
1231 }
1232
1233 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1234 * all the metrics... Shortly, bundle a bundle.
1235 */
1236
1237 static int
1238 xfrm_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
1239 struct flowi *fl, struct dst_entry **dst_p,
1240 unsigned short family)
1241 {
1242 int err;
1243 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1244 if (unlikely(afinfo == NULL))
1245 return -EINVAL;
1246 err = afinfo->bundle_create(policy, xfrm, nx, fl, dst_p);
1247 xfrm_policy_put_afinfo(afinfo);
1248 return err;
1249 }
1250
1251 static int inline
1252 xfrm_dst_alloc_copy(void **target, void *src, int size)
1253 {
1254 if (!*target) {
1255 *target = kmalloc(size, GFP_ATOMIC);
1256 if (!*target)
1257 return -ENOMEM;
1258 }
1259 memcpy(*target, src, size);
1260 return 0;
1261 }
1262
1263 static int inline
1264 xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel)
1265 {
1266 #ifdef CONFIG_XFRM_SUB_POLICY
1267 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1268 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1269 sel, sizeof(*sel));
1270 #else
1271 return 0;
1272 #endif
1273 }
1274
1275 static int inline
1276 xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl)
1277 {
1278 #ifdef CONFIG_XFRM_SUB_POLICY
1279 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1280 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1281 #else
1282 return 0;
1283 #endif
1284 }
1285
1286 static int stale_bundle(struct dst_entry *dst);
1287
1288 /* Main function: finds/creates a bundle for given flow.
1289 *
1290 * At the moment we eat a raw IP route. Mostly to speed up lookups
1291 * on interfaces with disabled IPsec.
1292 */
1293 int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
1294 struct sock *sk, int flags)
1295 {
1296 struct xfrm_policy *policy;
1297 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1298 int npols;
1299 int pol_dead;
1300 int xfrm_nr;
1301 int pi;
1302 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1303 struct dst_entry *dst, *dst_orig = *dst_p;
1304 int nx = 0;
1305 int err;
1306 u32 genid;
1307 u16 family;
1308 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
1309
1310 restart:
1311 genid = atomic_read(&flow_cache_genid);
1312 policy = NULL;
1313 for (pi = 0; pi < ARRAY_SIZE(pols); pi++)
1314 pols[pi] = NULL;
1315 npols = 0;
1316 pol_dead = 0;
1317 xfrm_nr = 0;
1318
1319 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
1320 policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
1321 if (IS_ERR(policy))
1322 return PTR_ERR(policy);
1323 }
1324
1325 if (!policy) {
1326 /* To accelerate a bit... */
1327 if ((dst_orig->flags & DST_NOXFRM) ||
1328 !xfrm_policy_count[XFRM_POLICY_OUT])
1329 return 0;
1330
1331 policy = flow_cache_lookup(fl, dst_orig->ops->family,
1332 dir, xfrm_policy_lookup);
1333 if (IS_ERR(policy))
1334 return PTR_ERR(policy);
1335 }
1336
1337 if (!policy)
1338 return 0;
1339
1340 family = dst_orig->ops->family;
1341 policy->curlft.use_time = get_seconds();
1342 pols[0] = policy;
1343 npols ++;
1344 xfrm_nr += pols[0]->xfrm_nr;
1345
1346 switch (policy->action) {
1347 case XFRM_POLICY_BLOCK:
1348 /* Prohibit the flow */
1349 err = -EPERM;
1350 goto error;
1351
1352 case XFRM_POLICY_ALLOW:
1353 #ifndef CONFIG_XFRM_SUB_POLICY
1354 if (policy->xfrm_nr == 0) {
1355 /* Flow passes not transformed. */
1356 xfrm_pol_put(policy);
1357 return 0;
1358 }
1359 #endif
1360
1361 /* Try to find matching bundle.
1362 *
1363 * LATER: help from flow cache. It is optional, this
1364 * is required only for output policy.
1365 */
1366 dst = xfrm_find_bundle(fl, policy, family);
1367 if (IS_ERR(dst)) {
1368 err = PTR_ERR(dst);
1369 goto error;
1370 }
1371
1372 if (dst)
1373 break;
1374
1375 #ifdef CONFIG_XFRM_SUB_POLICY
1376 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1377 pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN,
1378 fl, family,
1379 XFRM_POLICY_OUT);
1380 if (pols[1]) {
1381 if (IS_ERR(pols[1])) {
1382 err = PTR_ERR(pols[1]);
1383 goto error;
1384 }
1385 if (pols[1]->action == XFRM_POLICY_BLOCK) {
1386 err = -EPERM;
1387 goto error;
1388 }
1389 npols ++;
1390 xfrm_nr += pols[1]->xfrm_nr;
1391 }
1392 }
1393
1394 /*
1395 * Because neither flowi nor bundle information knows about
1396 * transformation template size. On more than one policy usage
1397 * we can realize whether all of them is bypass or not after
1398 * they are searched. See above not-transformed bypass
1399 * is surrounded by non-sub policy configuration, too.
1400 */
1401 if (xfrm_nr == 0) {
1402 /* Flow passes not transformed. */
1403 xfrm_pols_put(pols, npols);
1404 return 0;
1405 }
1406
1407 #endif
1408 nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);
1409
1410 if (unlikely(nx<0)) {
1411 err = nx;
1412 if (err == -EAGAIN && sysctl_xfrm_larval_drop) {
1413 /* EREMOTE tells the caller to generate
1414 * a one-shot blackhole route.
1415 */
1416 xfrm_pol_put(policy);
1417 return -EREMOTE;
1418 }
1419 if (err == -EAGAIN && flags) {
1420 DECLARE_WAITQUEUE(wait, current);
1421
1422 add_wait_queue(&km_waitq, &wait);
1423 set_current_state(TASK_INTERRUPTIBLE);
1424 schedule();
1425 set_current_state(TASK_RUNNING);
1426 remove_wait_queue(&km_waitq, &wait);
1427
1428 nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);
1429
1430 if (nx == -EAGAIN && signal_pending(current)) {
1431 err = -ERESTART;
1432 goto error;
1433 }
1434 if (nx == -EAGAIN ||
1435 genid != atomic_read(&flow_cache_genid)) {
1436 xfrm_pols_put(pols, npols);
1437 goto restart;
1438 }
1439 err = nx;
1440 }
1441 if (err < 0)
1442 goto error;
1443 }
1444 if (nx == 0) {
1445 /* Flow passes not transformed. */
1446 xfrm_pols_put(pols, npols);
1447 return 0;
1448 }
1449
1450 dst = dst_orig;
1451 err = xfrm_bundle_create(policy, xfrm, nx, fl, &dst, family);
1452
1453 if (unlikely(err)) {
1454 int i;
1455 for (i=0; i<nx; i++)
1456 xfrm_state_put(xfrm[i]);
1457 goto error;
1458 }
1459
1460 for (pi = 0; pi < npols; pi++) {
1461 read_lock_bh(&pols[pi]->lock);
1462 pol_dead |= pols[pi]->dead;
1463 read_unlock_bh(&pols[pi]->lock);
1464 }
1465
1466 write_lock_bh(&policy->lock);
1467 if (unlikely(pol_dead || stale_bundle(dst))) {
1468 /* Wow! While we worked on resolving, this
1469 * policy has gone. Retry. It is not paranoia,
1470 * we just cannot enlist new bundle to dead object.
1471 * We can't enlist stable bundles either.
1472 */
1473 write_unlock_bh(&policy->lock);
1474 if (dst)
1475 dst_free(dst);
1476
1477 err = -EHOSTUNREACH;
1478 goto error;
1479 }
1480
1481 if (npols > 1)
1482 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1483 else
1484 err = xfrm_dst_update_origin(dst, fl);
1485 if (unlikely(err)) {
1486 write_unlock_bh(&policy->lock);
1487 if (dst)
1488 dst_free(dst);
1489 goto error;
1490 }
1491
1492 dst->next = policy->bundles;
1493 policy->bundles = dst;
1494 dst_hold(dst);
1495 write_unlock_bh(&policy->lock);
1496 }
1497 *dst_p = dst;
1498 dst_release(dst_orig);
1499 xfrm_pols_put(pols, npols);
1500 return 0;
1501
1502 error:
1503 dst_release(dst_orig);
1504 xfrm_pols_put(pols, npols);
1505 *dst_p = NULL;
1506 return err;
1507 }
1508 EXPORT_SYMBOL(__xfrm_lookup);
1509
1510 int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
1511 struct sock *sk, int flags)
1512 {
1513 int err = __xfrm_lookup(dst_p, fl, sk, flags);
1514
1515 if (err == -EREMOTE) {
1516 dst_release(*dst_p);
1517 *dst_p = NULL;
1518 err = -EAGAIN;
1519 }
1520
1521 return err;
1522 }
1523 EXPORT_SYMBOL(xfrm_lookup);
1524
1525 static inline int
1526 xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl)
1527 {
1528 struct xfrm_state *x;
1529
1530 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
1531 return 0;
1532 x = skb->sp->xvec[idx];
1533 if (!x->type->reject)
1534 return 0;
1535 return x->type->reject(x, skb, fl);
1536 }
1537
1538 /* When skb is transformed back to its "native" form, we have to
1539 * check policy restrictions. At the moment we make this in maximally
1540 * stupid way. Shame on me. :-) Of course, connected sockets must
1541 * have policy cached at them.
1542 */
1543
1544 static inline int
1545 xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x,
1546 unsigned short family)
1547 {
1548 if (xfrm_state_kern(x))
1549 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
1550 return x->id.proto == tmpl->id.proto &&
1551 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
1552 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
1553 x->props.mode == tmpl->mode &&
1554 ((tmpl->aalgos & (1<<x->props.aalgo)) ||
1555 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
1556 !(x->props.mode != XFRM_MODE_TRANSPORT &&
1557 xfrm_state_addr_cmp(tmpl, x, family));
1558 }
1559
1560 /*
1561 * 0 or more than 0 is returned when validation is succeeded (either bypass
1562 * because of optional transport mode, or next index of the mathced secpath
1563 * state with the template.
1564 * -1 is returned when no matching template is found.
1565 * Otherwise "-2 - errored_index" is returned.
1566 */
1567 static inline int
1568 xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start,
1569 unsigned short family)
1570 {
1571 int idx = start;
1572
1573 if (tmpl->optional) {
1574 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1575 return start;
1576 } else
1577 start = -1;
1578 for (; idx < sp->len; idx++) {
1579 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
1580 return ++idx;
1581 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
1582 if (start == -1)
1583 start = -2-idx;
1584 break;
1585 }
1586 }
1587 return start;
1588 }
1589
1590 int
1591 xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family)
1592 {
1593 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1594 int err;
1595
1596 if (unlikely(afinfo == NULL))
1597 return -EAFNOSUPPORT;
1598
1599 afinfo->decode_session(skb, fl);
1600 err = security_xfrm_decode_session(skb, &fl->secid);
1601 xfrm_policy_put_afinfo(afinfo);
1602 return err;
1603 }
1604 EXPORT_SYMBOL(xfrm_decode_session);
1605
1606 static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp)
1607 {
1608 for (; k < sp->len; k++) {
1609 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
1610 *idxp = k;
1611 return 1;
1612 }
1613 }
1614
1615 return 0;
1616 }
1617
1618 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
1619 unsigned short family)
1620 {
1621 struct xfrm_policy *pol;
1622 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1623 int npols = 0;
1624 int xfrm_nr;
1625 int pi;
1626 struct flowi fl;
1627 u8 fl_dir = policy_to_flow_dir(dir);
1628 int xerr_idx = -1;
1629
1630 if (xfrm_decode_session(skb, &fl, family) < 0)
1631 return 0;
1632 nf_nat_decode_session(skb, &fl, family);
1633
1634 /* First, check used SA against their selectors. */
1635 if (skb->sp) {
1636 int i;
1637
1638 for (i=skb->sp->len-1; i>=0; i--) {
1639 struct xfrm_state *x = skb->sp->xvec[i];
1640 if (!xfrm_selector_match(&x->sel, &fl, family))
1641 return 0;
1642 }
1643 }
1644
1645 pol = NULL;
1646 if (sk && sk->sk_policy[dir]) {
1647 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
1648 if (IS_ERR(pol))
1649 return 0;
1650 }
1651
1652 if (!pol)
1653 pol = flow_cache_lookup(&fl, family, fl_dir,
1654 xfrm_policy_lookup);
1655
1656 if (IS_ERR(pol))
1657 return 0;
1658
1659 if (!pol) {
1660 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
1661 xfrm_secpath_reject(xerr_idx, skb, &fl);
1662 return 0;
1663 }
1664 return 1;
1665 }
1666
1667 pol->curlft.use_time = get_seconds();
1668
1669 pols[0] = pol;
1670 npols ++;
1671 #ifdef CONFIG_XFRM_SUB_POLICY
1672 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1673 pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN,
1674 &fl, family,
1675 XFRM_POLICY_IN);
1676 if (pols[1]) {
1677 if (IS_ERR(pols[1]))
1678 return 0;
1679 pols[1]->curlft.use_time = get_seconds();
1680 npols ++;
1681 }
1682 }
1683 #endif
1684
1685 if (pol->action == XFRM_POLICY_ALLOW) {
1686 struct sec_path *sp;
1687 static struct sec_path dummy;
1688 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
1689 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
1690 struct xfrm_tmpl **tpp = tp;
1691 int ti = 0;
1692 int i, k;
1693
1694 if ((sp = skb->sp) == NULL)
1695 sp = &dummy;
1696
1697 for (pi = 0; pi < npols; pi++) {
1698 if (pols[pi] != pol &&
1699 pols[pi]->action != XFRM_POLICY_ALLOW)
1700 goto reject;
1701 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH)
1702 goto reject_error;
1703 for (i = 0; i < pols[pi]->xfrm_nr; i++)
1704 tpp[ti++] = &pols[pi]->xfrm_vec[i];
1705 }
1706 xfrm_nr = ti;
1707 if (npols > 1) {
1708 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
1709 tpp = stp;
1710 }
1711
1712 /* For each tunnel xfrm, find the first matching tmpl.
1713 * For each tmpl before that, find corresponding xfrm.
1714 * Order is _important_. Later we will implement
1715 * some barriers, but at the moment barriers
1716 * are implied between each two transformations.
1717 */
1718 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
1719 k = xfrm_policy_ok(tpp[i], sp, k, family);
1720 if (k < 0) {
1721 if (k < -1)
1722 /* "-2 - errored_index" returned */
1723 xerr_idx = -(2+k);
1724 goto reject;
1725 }
1726 }
1727
1728 if (secpath_has_nontransport(sp, k, &xerr_idx))
1729 goto reject;
1730
1731 xfrm_pols_put(pols, npols);
1732 return 1;
1733 }
1734
1735 reject:
1736 xfrm_secpath_reject(xerr_idx, skb, &fl);
1737 reject_error:
1738 xfrm_pols_put(pols, npols);
1739 return 0;
1740 }
1741 EXPORT_SYMBOL(__xfrm_policy_check);
1742
1743 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1744 {
1745 struct flowi fl;
1746
1747 if (xfrm_decode_session(skb, &fl, family) < 0)
1748 return 0;
1749
1750 return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0;
1751 }
1752 EXPORT_SYMBOL(__xfrm_route_forward);
1753
1754 /* Optimize later using cookies and generation ids. */
1755
1756 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
1757 {
1758 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
1759 * to "-1" to force all XFRM destinations to get validated by
1760 * dst_ops->check on every use. We do this because when a
1761 * normal route referenced by an XFRM dst is obsoleted we do
1762 * not go looking around for all parent referencing XFRM dsts
1763 * so that we can invalidate them. It is just too much work.
1764 * Instead we make the checks here on every use. For example:
1765 *
1766 * XFRM dst A --> IPv4 dst X
1767 *
1768 * X is the "xdst->route" of A (X is also the "dst->path" of A
1769 * in this example). If X is marked obsolete, "A" will not
1770 * notice. That's what we are validating here via the
1771 * stale_bundle() check.
1772 *
1773 * When a policy's bundle is pruned, we dst_free() the XFRM
1774 * dst which causes it's ->obsolete field to be set to a
1775 * positive non-zero integer. If an XFRM dst has been pruned
1776 * like this, we want to force a new route lookup.
1777 */
1778 if (dst->obsolete < 0 && !stale_bundle(dst))
1779 return dst;
1780
1781 return NULL;
1782 }
1783
1784 static int stale_bundle(struct dst_entry *dst)
1785 {
1786 return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0);
1787 }
1788
1789 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
1790 {
1791 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
1792 dst->dev = init_net.loopback_dev;
1793 dev_hold(dst->dev);
1794 dev_put(dev);
1795 }
1796 }
1797 EXPORT_SYMBOL(xfrm_dst_ifdown);
1798
1799 static void xfrm_link_failure(struct sk_buff *skb)
1800 {
1801 /* Impossible. Such dst must be popped before reaches point of failure. */
1802 return;
1803 }
1804
1805 static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
1806 {
1807 if (dst) {
1808 if (dst->obsolete) {
1809 dst_release(dst);
1810 dst = NULL;
1811 }
1812 }
1813 return dst;
1814 }
1815
1816 static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p)
1817 {
1818 struct dst_entry *dst, **dstp;
1819
1820 write_lock(&pol->lock);
1821 dstp = &pol->bundles;
1822 while ((dst=*dstp) != NULL) {
1823 if (func(dst)) {
1824 *dstp = dst->next;
1825 dst->next = *gc_list_p;
1826 *gc_list_p = dst;
1827 } else {
1828 dstp = &dst->next;
1829 }
1830 }
1831 write_unlock(&pol->lock);
1832 }
1833
1834 static void xfrm_prune_bundles(int (*func)(struct dst_entry *))
1835 {
1836 struct dst_entry *gc_list = NULL;
1837 int dir;
1838
1839 read_lock_bh(&xfrm_policy_lock);
1840 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
1841 struct xfrm_policy *pol;
1842 struct hlist_node *entry;
1843 struct hlist_head *table;
1844 int i;
1845
1846 hlist_for_each_entry(pol, entry,
1847 &xfrm_policy_inexact[dir], bydst)
1848 prune_one_bundle(pol, func, &gc_list);
1849
1850 table = xfrm_policy_bydst[dir].table;
1851 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
1852 hlist_for_each_entry(pol, entry, table + i, bydst)
1853 prune_one_bundle(pol, func, &gc_list);
1854 }
1855 }
1856 read_unlock_bh(&xfrm_policy_lock);
1857
1858 while (gc_list) {
1859 struct dst_entry *dst = gc_list;
1860 gc_list = dst->next;
1861 dst_free(dst);
1862 }
1863 }
1864
1865 static int unused_bundle(struct dst_entry *dst)
1866 {
1867 return !atomic_read(&dst->__refcnt);
1868 }
1869
1870 static void __xfrm_garbage_collect(void)
1871 {
1872 xfrm_prune_bundles(unused_bundle);
1873 }
1874
1875 static int xfrm_flush_bundles(void)
1876 {
1877 xfrm_prune_bundles(stale_bundle);
1878 return 0;
1879 }
1880
1881 void xfrm_init_pmtu(struct dst_entry *dst)
1882 {
1883 do {
1884 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1885 u32 pmtu, route_mtu_cached;
1886
1887 pmtu = dst_mtu(dst->child);
1888 xdst->child_mtu_cached = pmtu;
1889
1890 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
1891
1892 route_mtu_cached = dst_mtu(xdst->route);
1893 xdst->route_mtu_cached = route_mtu_cached;
1894
1895 if (pmtu > route_mtu_cached)
1896 pmtu = route_mtu_cached;
1897
1898 dst->metrics[RTAX_MTU-1] = pmtu;
1899 } while ((dst = dst->next));
1900 }
1901
1902 EXPORT_SYMBOL(xfrm_init_pmtu);
1903
1904 /* Check that the bundle accepts the flow and its components are
1905 * still valid.
1906 */
1907
1908 int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first,
1909 struct flowi *fl, int family, int strict)
1910 {
1911 struct dst_entry *dst = &first->u.dst;
1912 struct xfrm_dst *last;
1913 u32 mtu;
1914
1915 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
1916 (dst->dev && !netif_running(dst->dev)))
1917 return 0;
1918 #ifdef CONFIG_XFRM_SUB_POLICY
1919 if (fl) {
1920 if (first->origin && !flow_cache_uli_match(first->origin, fl))
1921 return 0;
1922 if (first->partner &&
1923 !xfrm_selector_match(first->partner, fl, family))
1924 return 0;
1925 }
1926 #endif
1927
1928 last = NULL;
1929
1930 do {
1931 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1932
1933 if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family))
1934 return 0;
1935 if (fl && pol &&
1936 !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl))
1937 return 0;
1938 if (dst->xfrm->km.state != XFRM_STATE_VALID)
1939 return 0;
1940 if (xdst->genid != dst->xfrm->genid)
1941 return 0;
1942
1943 if (strict && fl &&
1944 !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
1945 !xfrm_state_addr_flow_check(dst->xfrm, fl, family))
1946 return 0;
1947
1948 mtu = dst_mtu(dst->child);
1949 if (xdst->child_mtu_cached != mtu) {
1950 last = xdst;
1951 xdst->child_mtu_cached = mtu;
1952 }
1953
1954 if (!dst_check(xdst->route, xdst->route_cookie))
1955 return 0;
1956 mtu = dst_mtu(xdst->route);
1957 if (xdst->route_mtu_cached != mtu) {
1958 last = xdst;
1959 xdst->route_mtu_cached = mtu;
1960 }
1961
1962 dst = dst->child;
1963 } while (dst->xfrm);
1964
1965 if (likely(!last))
1966 return 1;
1967
1968 mtu = last->child_mtu_cached;
1969 for (;;) {
1970 dst = &last->u.dst;
1971
1972 mtu = xfrm_state_mtu(dst->xfrm, mtu);
1973 if (mtu > last->route_mtu_cached)
1974 mtu = last->route_mtu_cached;
1975 dst->metrics[RTAX_MTU-1] = mtu;
1976
1977 if (last == first)
1978 break;
1979
1980 last = (struct xfrm_dst *)last->u.dst.next;
1981 last->child_mtu_cached = mtu;
1982 }
1983
1984 return 1;
1985 }
1986
1987 EXPORT_SYMBOL(xfrm_bundle_ok);
1988
1989 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
1990 {
1991 int err = 0;
1992 if (unlikely(afinfo == NULL))
1993 return -EINVAL;
1994 if (unlikely(afinfo->family >= NPROTO))
1995 return -EAFNOSUPPORT;
1996 write_lock_bh(&xfrm_policy_afinfo_lock);
1997 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
1998 err = -ENOBUFS;
1999 else {
2000 struct dst_ops *dst_ops = afinfo->dst_ops;
2001 if (likely(dst_ops->kmem_cachep == NULL))
2002 dst_ops->kmem_cachep = xfrm_dst_cache;
2003 if (likely(dst_ops->check == NULL))
2004 dst_ops->check = xfrm_dst_check;
2005 if (likely(dst_ops->negative_advice == NULL))
2006 dst_ops->negative_advice = xfrm_negative_advice;
2007 if (likely(dst_ops->link_failure == NULL))
2008 dst_ops->link_failure = xfrm_link_failure;
2009 if (likely(afinfo->garbage_collect == NULL))
2010 afinfo->garbage_collect = __xfrm_garbage_collect;
2011 xfrm_policy_afinfo[afinfo->family] = afinfo;
2012 }
2013 write_unlock_bh(&xfrm_policy_afinfo_lock);
2014 return err;
2015 }
2016 EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2017
2018 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2019 {
2020 int err = 0;
2021 if (unlikely(afinfo == NULL))
2022 return -EINVAL;
2023 if (unlikely(afinfo->family >= NPROTO))
2024 return -EAFNOSUPPORT;
2025 write_lock_bh(&xfrm_policy_afinfo_lock);
2026 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2027 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2028 err = -EINVAL;
2029 else {
2030 struct dst_ops *dst_ops = afinfo->dst_ops;
2031 xfrm_policy_afinfo[afinfo->family] = NULL;
2032 dst_ops->kmem_cachep = NULL;
2033 dst_ops->check = NULL;
2034 dst_ops->negative_advice = NULL;
2035 dst_ops->link_failure = NULL;
2036 afinfo->garbage_collect = NULL;
2037 }
2038 }
2039 write_unlock_bh(&xfrm_policy_afinfo_lock);
2040 return err;
2041 }
2042 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2043
2044 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
2045 {
2046 struct xfrm_policy_afinfo *afinfo;
2047 if (unlikely(family >= NPROTO))
2048 return NULL;
2049 read_lock(&xfrm_policy_afinfo_lock);
2050 afinfo = xfrm_policy_afinfo[family];
2051 if (unlikely(!afinfo))
2052 read_unlock(&xfrm_policy_afinfo_lock);
2053 return afinfo;
2054 }
2055
2056 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
2057 {
2058 read_unlock(&xfrm_policy_afinfo_lock);
2059 }
2060
2061 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2062 {
2063 struct net_device *dev = ptr;
2064
2065 if (dev->nd_net != &init_net)
2066 return NOTIFY_DONE;
2067
2068 switch (event) {
2069 case NETDEV_DOWN:
2070 xfrm_flush_bundles();
2071 }
2072 return NOTIFY_DONE;
2073 }
2074
2075 static struct notifier_block xfrm_dev_notifier = {
2076 xfrm_dev_event,
2077 NULL,
2078 0
2079 };
2080
2081 static void __init xfrm_policy_init(void)
2082 {
2083 unsigned int hmask, sz;
2084 int dir;
2085
2086 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
2087 sizeof(struct xfrm_dst),
2088 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
2089 NULL);
2090
2091 hmask = 8 - 1;
2092 sz = (hmask+1) * sizeof(struct hlist_head);
2093
2094 xfrm_policy_byidx = xfrm_hash_alloc(sz);
2095 xfrm_idx_hmask = hmask;
2096 if (!xfrm_policy_byidx)
2097 panic("XFRM: failed to allocate byidx hash\n");
2098
2099 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2100 struct xfrm_policy_hash *htab;
2101
2102 INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]);
2103
2104 htab = &xfrm_policy_bydst[dir];
2105 htab->table = xfrm_hash_alloc(sz);
2106 htab->hmask = hmask;
2107 if (!htab->table)
2108 panic("XFRM: failed to allocate bydst hash\n");
2109 }
2110
2111 INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task);
2112 register_netdevice_notifier(&xfrm_dev_notifier);
2113 }
2114
2115 void __init xfrm_init(void)
2116 {
2117 xfrm_state_init();
2118 xfrm_policy_init();
2119 xfrm_input_init();
2120 }
2121
2122 #ifdef CONFIG_AUDITSYSCALL
2123 static inline void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
2124 struct audit_buffer *audit_buf)
2125 {
2126 if (xp->security)
2127 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2128 xp->security->ctx_alg, xp->security->ctx_doi,
2129 xp->security->ctx_str);
2130
2131 switch(xp->selector.family) {
2132 case AF_INET:
2133 audit_log_format(audit_buf, " src=%u.%u.%u.%u dst=%u.%u.%u.%u",
2134 NIPQUAD(xp->selector.saddr.a4),
2135 NIPQUAD(xp->selector.daddr.a4));
2136 break;
2137 case AF_INET6:
2138 {
2139 struct in6_addr saddr6, daddr6;
2140
2141 memcpy(&saddr6, xp->selector.saddr.a6,
2142 sizeof(struct in6_addr));
2143 memcpy(&daddr6, xp->selector.daddr.a6,
2144 sizeof(struct in6_addr));
2145 audit_log_format(audit_buf,
2146 " src=" NIP6_FMT " dst=" NIP6_FMT,
2147 NIP6(saddr6), NIP6(daddr6));
2148 }
2149 break;
2150 }
2151 }
2152
2153 void
2154 xfrm_audit_policy_add(struct xfrm_policy *xp, int result, u32 auid, u32 sid)
2155 {
2156 struct audit_buffer *audit_buf;
2157 extern int audit_enabled;
2158
2159 if (audit_enabled == 0)
2160 return;
2161 audit_buf = xfrm_audit_start(sid, auid);
2162 if (audit_buf == NULL)
2163 return;
2164 audit_log_format(audit_buf, " op=SPD-add res=%u", result);
2165 xfrm_audit_common_policyinfo(xp, audit_buf);
2166 audit_log_end(audit_buf);
2167 }
2168 EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
2169
2170 void
2171 xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, u32 auid, u32 sid)
2172 {
2173 struct audit_buffer *audit_buf;
2174 extern int audit_enabled;
2175
2176 if (audit_enabled == 0)
2177 return;
2178 audit_buf = xfrm_audit_start(sid, auid);
2179 if (audit_buf == NULL)
2180 return;
2181 audit_log_format(audit_buf, " op=SPD-delete res=%u", result);
2182 xfrm_audit_common_policyinfo(xp, audit_buf);
2183 audit_log_end(audit_buf);
2184 }
2185 EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
2186 #endif
2187
2188 #ifdef CONFIG_XFRM_MIGRATE
2189 static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp,
2190 struct xfrm_selector *sel_tgt)
2191 {
2192 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
2193 if (sel_tgt->family == sel_cmp->family &&
2194 xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr,
2195 sel_cmp->family) == 0 &&
2196 xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr,
2197 sel_cmp->family) == 0 &&
2198 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
2199 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
2200 return 1;
2201 }
2202 } else {
2203 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
2204 return 1;
2205 }
2206 }
2207 return 0;
2208 }
2209
2210 static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel,
2211 u8 dir, u8 type)
2212 {
2213 struct xfrm_policy *pol, *ret = NULL;
2214 struct hlist_node *entry;
2215 struct hlist_head *chain;
2216 u32 priority = ~0U;
2217
2218 read_lock_bh(&xfrm_policy_lock);
2219 chain = policy_hash_direct(&sel->daddr, &sel->saddr, sel->family, dir);
2220 hlist_for_each_entry(pol, entry, chain, bydst) {
2221 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2222 pol->type == type) {
2223 ret = pol;
2224 priority = ret->priority;
2225 break;
2226 }
2227 }
2228 chain = &xfrm_policy_inexact[dir];
2229 hlist_for_each_entry(pol, entry, chain, bydst) {
2230 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2231 pol->type == type &&
2232 pol->priority < priority) {
2233 ret = pol;
2234 break;
2235 }
2236 }
2237
2238 if (ret)
2239 xfrm_pol_hold(ret);
2240
2241 read_unlock_bh(&xfrm_policy_lock);
2242
2243 return ret;
2244 }
2245
2246 static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t)
2247 {
2248 int match = 0;
2249
2250 if (t->mode == m->mode && t->id.proto == m->proto &&
2251 (m->reqid == 0 || t->reqid == m->reqid)) {
2252 switch (t->mode) {
2253 case XFRM_MODE_TUNNEL:
2254 case XFRM_MODE_BEET:
2255 if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr,
2256 m->old_family) == 0 &&
2257 xfrm_addr_cmp(&t->saddr, &m->old_saddr,
2258 m->old_family) == 0) {
2259 match = 1;
2260 }
2261 break;
2262 case XFRM_MODE_TRANSPORT:
2263 /* in case of transport mode, template does not store
2264 any IP addresses, hence we just compare mode and
2265 protocol */
2266 match = 1;
2267 break;
2268 default:
2269 break;
2270 }
2271 }
2272 return match;
2273 }
2274
2275 /* update endpoint address(es) of template(s) */
2276 static int xfrm_policy_migrate(struct xfrm_policy *pol,
2277 struct xfrm_migrate *m, int num_migrate)
2278 {
2279 struct xfrm_migrate *mp;
2280 struct dst_entry *dst;
2281 int i, j, n = 0;
2282
2283 write_lock_bh(&pol->lock);
2284 if (unlikely(pol->dead)) {
2285 /* target policy has been deleted */
2286 write_unlock_bh(&pol->lock);
2287 return -ENOENT;
2288 }
2289
2290 for (i = 0; i < pol->xfrm_nr; i++) {
2291 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
2292 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
2293 continue;
2294 n++;
2295 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
2296 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
2297 continue;
2298 /* update endpoints */
2299 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
2300 sizeof(pol->xfrm_vec[i].id.daddr));
2301 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
2302 sizeof(pol->xfrm_vec[i].saddr));
2303 pol->xfrm_vec[i].encap_family = mp->new_family;
2304 /* flush bundles */
2305 while ((dst = pol->bundles) != NULL) {
2306 pol->bundles = dst->next;
2307 dst_free(dst);
2308 }
2309 }
2310 }
2311
2312 write_unlock_bh(&pol->lock);
2313
2314 if (!n)
2315 return -ENODATA;
2316
2317 return 0;
2318 }
2319
2320 static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate)
2321 {
2322 int i, j;
2323
2324 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
2325 return -EINVAL;
2326
2327 for (i = 0; i < num_migrate; i++) {
2328 if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr,
2329 m[i].old_family) == 0) &&
2330 (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr,
2331 m[i].old_family) == 0))
2332 return -EINVAL;
2333 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
2334 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
2335 return -EINVAL;
2336
2337 /* check if there is any duplicated entry */
2338 for (j = i + 1; j < num_migrate; j++) {
2339 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
2340 sizeof(m[i].old_daddr)) &&
2341 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
2342 sizeof(m[i].old_saddr)) &&
2343 m[i].proto == m[j].proto &&
2344 m[i].mode == m[j].mode &&
2345 m[i].reqid == m[j].reqid &&
2346 m[i].old_family == m[j].old_family)
2347 return -EINVAL;
2348 }
2349 }
2350
2351 return 0;
2352 }
2353
2354 int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
2355 struct xfrm_migrate *m, int num_migrate)
2356 {
2357 int i, err, nx_cur = 0, nx_new = 0;
2358 struct xfrm_policy *pol = NULL;
2359 struct xfrm_state *x, *xc;
2360 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
2361 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
2362 struct xfrm_migrate *mp;
2363
2364 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
2365 goto out;
2366
2367 /* Stage 1 - find policy */
2368 if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) {
2369 err = -ENOENT;
2370 goto out;
2371 }
2372
2373 /* Stage 2 - find and update state(s) */
2374 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
2375 if ((x = xfrm_migrate_state_find(mp))) {
2376 x_cur[nx_cur] = x;
2377 nx_cur++;
2378 if ((xc = xfrm_state_migrate(x, mp))) {
2379 x_new[nx_new] = xc;
2380 nx_new++;
2381 } else {
2382 err = -ENODATA;
2383 goto restore_state;
2384 }
2385 }
2386 }
2387
2388 /* Stage 3 - update policy */
2389 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
2390 goto restore_state;
2391
2392 /* Stage 4 - delete old state(s) */
2393 if (nx_cur) {
2394 xfrm_states_put(x_cur, nx_cur);
2395 xfrm_states_delete(x_cur, nx_cur);
2396 }
2397
2398 /* Stage 5 - announce */
2399 km_migrate(sel, dir, type, m, num_migrate);
2400
2401 xfrm_pol_put(pol);
2402
2403 return 0;
2404 out:
2405 return err;
2406
2407 restore_state:
2408 if (pol)
2409 xfrm_pol_put(pol);
2410 if (nx_cur)
2411 xfrm_states_put(x_cur, nx_cur);
2412 if (nx_new)
2413 xfrm_states_delete(x_new, nx_new);
2414
2415 return err;
2416 }
2417 EXPORT_SYMBOL(xfrm_migrate);
2418 #endif
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