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Merge branch 'timer/cleanup' into late/mvebu2
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / xfrm / xfrm_policy.c
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/err.h>
17 #include <linux/slab.h>
18 #include <linux/kmod.h>
19 #include <linux/list.h>
20 #include <linux/spinlock.h>
21 #include <linux/workqueue.h>
22 #include <linux/notifier.h>
23 #include <linux/netdevice.h>
24 #include <linux/netfilter.h>
25 #include <linux/module.h>
26 #include <linux/cache.h>
27 #include <linux/audit.h>
28 #include <net/dst.h>
29 #include <net/flow.h>
30 #include <net/xfrm.h>
31 #include <net/ip.h>
32 #ifdef CONFIG_XFRM_STATISTICS
33 #include <net/snmp.h>
34 #endif
35
36 #include "xfrm_hash.h"
37
38 DEFINE_MUTEX(xfrm_cfg_mutex);
39 EXPORT_SYMBOL(xfrm_cfg_mutex);
40
41 static DEFINE_SPINLOCK(xfrm_policy_sk_bundle_lock);
42 static struct dst_entry *xfrm_policy_sk_bundles;
43 static DEFINE_RWLOCK(xfrm_policy_lock);
44
45 static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock);
46 static struct xfrm_policy_afinfo __rcu *xfrm_policy_afinfo[NPROTO]
47 __read_mostly;
48
49 static struct kmem_cache *xfrm_dst_cache __read_mostly;
50
51 static void xfrm_init_pmtu(struct dst_entry *dst);
52 static int stale_bundle(struct dst_entry *dst);
53 static int xfrm_bundle_ok(struct xfrm_dst *xdst);
54
55
56 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
57 int dir);
58
59 static inline bool
60 __xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
61 {
62 const struct flowi4 *fl4 = &fl->u.ip4;
63
64 return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) &&
65 addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) &&
66 !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) &&
67 !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) &&
68 (fl4->flowi4_proto == sel->proto || !sel->proto) &&
69 (fl4->flowi4_oif == sel->ifindex || !sel->ifindex);
70 }
71
72 static inline bool
73 __xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
74 {
75 const struct flowi6 *fl6 = &fl->u.ip6;
76
77 return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) &&
78 addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) &&
79 !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) &&
80 !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) &&
81 (fl6->flowi6_proto == sel->proto || !sel->proto) &&
82 (fl6->flowi6_oif == sel->ifindex || !sel->ifindex);
83 }
84
85 bool xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl,
86 unsigned short family)
87 {
88 switch (family) {
89 case AF_INET:
90 return __xfrm4_selector_match(sel, fl);
91 case AF_INET6:
92 return __xfrm6_selector_match(sel, fl);
93 }
94 return false;
95 }
96
97 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
98 {
99 struct xfrm_policy_afinfo *afinfo;
100
101 if (unlikely(family >= NPROTO))
102 return NULL;
103 rcu_read_lock();
104 afinfo = rcu_dereference(xfrm_policy_afinfo[family]);
105 if (unlikely(!afinfo))
106 rcu_read_unlock();
107 return afinfo;
108 }
109
110 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
111 {
112 rcu_read_unlock();
113 }
114
115 static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos,
116 const xfrm_address_t *saddr,
117 const xfrm_address_t *daddr,
118 int family)
119 {
120 struct xfrm_policy_afinfo *afinfo;
121 struct dst_entry *dst;
122
123 afinfo = xfrm_policy_get_afinfo(family);
124 if (unlikely(afinfo == NULL))
125 return ERR_PTR(-EAFNOSUPPORT);
126
127 dst = afinfo->dst_lookup(net, tos, saddr, daddr);
128
129 xfrm_policy_put_afinfo(afinfo);
130
131 return dst;
132 }
133
134 static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos,
135 xfrm_address_t *prev_saddr,
136 xfrm_address_t *prev_daddr,
137 int family)
138 {
139 struct net *net = xs_net(x);
140 xfrm_address_t *saddr = &x->props.saddr;
141 xfrm_address_t *daddr = &x->id.daddr;
142 struct dst_entry *dst;
143
144 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
145 saddr = x->coaddr;
146 daddr = prev_daddr;
147 }
148 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
149 saddr = prev_saddr;
150 daddr = x->coaddr;
151 }
152
153 dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family);
154
155 if (!IS_ERR(dst)) {
156 if (prev_saddr != saddr)
157 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
158 if (prev_daddr != daddr)
159 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
160 }
161
162 return dst;
163 }
164
165 static inline unsigned long make_jiffies(long secs)
166 {
167 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
168 return MAX_SCHEDULE_TIMEOUT-1;
169 else
170 return secs*HZ;
171 }
172
173 static void xfrm_policy_timer(unsigned long data)
174 {
175 struct xfrm_policy *xp = (struct xfrm_policy*)data;
176 unsigned long now = get_seconds();
177 long next = LONG_MAX;
178 int warn = 0;
179 int dir;
180
181 read_lock(&xp->lock);
182
183 if (unlikely(xp->walk.dead))
184 goto out;
185
186 dir = xfrm_policy_id2dir(xp->index);
187
188 if (xp->lft.hard_add_expires_seconds) {
189 long tmo = xp->lft.hard_add_expires_seconds +
190 xp->curlft.add_time - now;
191 if (tmo <= 0)
192 goto expired;
193 if (tmo < next)
194 next = tmo;
195 }
196 if (xp->lft.hard_use_expires_seconds) {
197 long tmo = xp->lft.hard_use_expires_seconds +
198 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
199 if (tmo <= 0)
200 goto expired;
201 if (tmo < next)
202 next = tmo;
203 }
204 if (xp->lft.soft_add_expires_seconds) {
205 long tmo = xp->lft.soft_add_expires_seconds +
206 xp->curlft.add_time - now;
207 if (tmo <= 0) {
208 warn = 1;
209 tmo = XFRM_KM_TIMEOUT;
210 }
211 if (tmo < next)
212 next = tmo;
213 }
214 if (xp->lft.soft_use_expires_seconds) {
215 long tmo = xp->lft.soft_use_expires_seconds +
216 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
217 if (tmo <= 0) {
218 warn = 1;
219 tmo = XFRM_KM_TIMEOUT;
220 }
221 if (tmo < next)
222 next = tmo;
223 }
224
225 if (warn)
226 km_policy_expired(xp, dir, 0, 0);
227 if (next != LONG_MAX &&
228 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
229 xfrm_pol_hold(xp);
230
231 out:
232 read_unlock(&xp->lock);
233 xfrm_pol_put(xp);
234 return;
235
236 expired:
237 read_unlock(&xp->lock);
238 if (!xfrm_policy_delete(xp, dir))
239 km_policy_expired(xp, dir, 1, 0);
240 xfrm_pol_put(xp);
241 }
242
243 static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo)
244 {
245 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
246
247 if (unlikely(pol->walk.dead))
248 flo = NULL;
249 else
250 xfrm_pol_hold(pol);
251
252 return flo;
253 }
254
255 static int xfrm_policy_flo_check(struct flow_cache_object *flo)
256 {
257 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
258
259 return !pol->walk.dead;
260 }
261
262 static void xfrm_policy_flo_delete(struct flow_cache_object *flo)
263 {
264 xfrm_pol_put(container_of(flo, struct xfrm_policy, flo));
265 }
266
267 static const struct flow_cache_ops xfrm_policy_fc_ops = {
268 .get = xfrm_policy_flo_get,
269 .check = xfrm_policy_flo_check,
270 .delete = xfrm_policy_flo_delete,
271 };
272
273 /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
274 * SPD calls.
275 */
276
277 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
278 {
279 struct xfrm_policy *policy;
280
281 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
282
283 if (policy) {
284 write_pnet(&policy->xp_net, net);
285 INIT_LIST_HEAD(&policy->walk.all);
286 INIT_HLIST_NODE(&policy->bydst);
287 INIT_HLIST_NODE(&policy->byidx);
288 rwlock_init(&policy->lock);
289 atomic_set(&policy->refcnt, 1);
290 setup_timer(&policy->timer, xfrm_policy_timer,
291 (unsigned long)policy);
292 policy->flo.ops = &xfrm_policy_fc_ops;
293 }
294 return policy;
295 }
296 EXPORT_SYMBOL(xfrm_policy_alloc);
297
298 /* Destroy xfrm_policy: descendant resources must be released to this moment. */
299
300 void xfrm_policy_destroy(struct xfrm_policy *policy)
301 {
302 BUG_ON(!policy->walk.dead);
303
304 if (del_timer(&policy->timer))
305 BUG();
306
307 security_xfrm_policy_free(policy->security);
308 kfree(policy);
309 }
310 EXPORT_SYMBOL(xfrm_policy_destroy);
311
312 /* Rule must be locked. Release descentant resources, announce
313 * entry dead. The rule must be unlinked from lists to the moment.
314 */
315
316 static void xfrm_policy_kill(struct xfrm_policy *policy)
317 {
318 policy->walk.dead = 1;
319
320 atomic_inc(&policy->genid);
321
322 if (del_timer(&policy->timer))
323 xfrm_pol_put(policy);
324
325 xfrm_pol_put(policy);
326 }
327
328 static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
329
330 static inline unsigned int idx_hash(struct net *net, u32 index)
331 {
332 return __idx_hash(index, net->xfrm.policy_idx_hmask);
333 }
334
335 static struct hlist_head *policy_hash_bysel(struct net *net,
336 const struct xfrm_selector *sel,
337 unsigned short family, int dir)
338 {
339 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
340 unsigned int hash = __sel_hash(sel, family, hmask);
341
342 return (hash == hmask + 1 ?
343 &net->xfrm.policy_inexact[dir] :
344 net->xfrm.policy_bydst[dir].table + hash);
345 }
346
347 static struct hlist_head *policy_hash_direct(struct net *net,
348 const xfrm_address_t *daddr,
349 const xfrm_address_t *saddr,
350 unsigned short family, int dir)
351 {
352 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
353 unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
354
355 return net->xfrm.policy_bydst[dir].table + hash;
356 }
357
358 static void xfrm_dst_hash_transfer(struct hlist_head *list,
359 struct hlist_head *ndsttable,
360 unsigned int nhashmask)
361 {
362 struct hlist_node *entry, *tmp, *entry0 = NULL;
363 struct xfrm_policy *pol;
364 unsigned int h0 = 0;
365
366 redo:
367 hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) {
368 unsigned int h;
369
370 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
371 pol->family, nhashmask);
372 if (!entry0) {
373 hlist_del(entry);
374 hlist_add_head(&pol->bydst, ndsttable+h);
375 h0 = h;
376 } else {
377 if (h != h0)
378 continue;
379 hlist_del(entry);
380 hlist_add_after(entry0, &pol->bydst);
381 }
382 entry0 = entry;
383 }
384 if (!hlist_empty(list)) {
385 entry0 = NULL;
386 goto redo;
387 }
388 }
389
390 static void xfrm_idx_hash_transfer(struct hlist_head *list,
391 struct hlist_head *nidxtable,
392 unsigned int nhashmask)
393 {
394 struct hlist_node *entry, *tmp;
395 struct xfrm_policy *pol;
396
397 hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) {
398 unsigned int h;
399
400 h = __idx_hash(pol->index, nhashmask);
401 hlist_add_head(&pol->byidx, nidxtable+h);
402 }
403 }
404
405 static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
406 {
407 return ((old_hmask + 1) << 1) - 1;
408 }
409
410 static void xfrm_bydst_resize(struct net *net, int dir)
411 {
412 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
413 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
414 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
415 struct hlist_head *odst = net->xfrm.policy_bydst[dir].table;
416 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
417 int i;
418
419 if (!ndst)
420 return;
421
422 write_lock_bh(&xfrm_policy_lock);
423
424 for (i = hmask; i >= 0; i--)
425 xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
426
427 net->xfrm.policy_bydst[dir].table = ndst;
428 net->xfrm.policy_bydst[dir].hmask = nhashmask;
429
430 write_unlock_bh(&xfrm_policy_lock);
431
432 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
433 }
434
435 static void xfrm_byidx_resize(struct net *net, int total)
436 {
437 unsigned int hmask = net->xfrm.policy_idx_hmask;
438 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
439 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
440 struct hlist_head *oidx = net->xfrm.policy_byidx;
441 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
442 int i;
443
444 if (!nidx)
445 return;
446
447 write_lock_bh(&xfrm_policy_lock);
448
449 for (i = hmask; i >= 0; i--)
450 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
451
452 net->xfrm.policy_byidx = nidx;
453 net->xfrm.policy_idx_hmask = nhashmask;
454
455 write_unlock_bh(&xfrm_policy_lock);
456
457 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
458 }
459
460 static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
461 {
462 unsigned int cnt = net->xfrm.policy_count[dir];
463 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
464
465 if (total)
466 *total += cnt;
467
468 if ((hmask + 1) < xfrm_policy_hashmax &&
469 cnt > hmask)
470 return 1;
471
472 return 0;
473 }
474
475 static inline int xfrm_byidx_should_resize(struct net *net, int total)
476 {
477 unsigned int hmask = net->xfrm.policy_idx_hmask;
478
479 if ((hmask + 1) < xfrm_policy_hashmax &&
480 total > hmask)
481 return 1;
482
483 return 0;
484 }
485
486 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si)
487 {
488 read_lock_bh(&xfrm_policy_lock);
489 si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN];
490 si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT];
491 si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD];
492 si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
493 si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
494 si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
495 si->spdhcnt = net->xfrm.policy_idx_hmask;
496 si->spdhmcnt = xfrm_policy_hashmax;
497 read_unlock_bh(&xfrm_policy_lock);
498 }
499 EXPORT_SYMBOL(xfrm_spd_getinfo);
500
501 static DEFINE_MUTEX(hash_resize_mutex);
502 static void xfrm_hash_resize(struct work_struct *work)
503 {
504 struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
505 int dir, total;
506
507 mutex_lock(&hash_resize_mutex);
508
509 total = 0;
510 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
511 if (xfrm_bydst_should_resize(net, dir, &total))
512 xfrm_bydst_resize(net, dir);
513 }
514 if (xfrm_byidx_should_resize(net, total))
515 xfrm_byidx_resize(net, total);
516
517 mutex_unlock(&hash_resize_mutex);
518 }
519
520 /* Generate new index... KAME seems to generate them ordered by cost
521 * of an absolute inpredictability of ordering of rules. This will not pass. */
522 static u32 xfrm_gen_index(struct net *net, int dir)
523 {
524 static u32 idx_generator;
525
526 for (;;) {
527 struct hlist_node *entry;
528 struct hlist_head *list;
529 struct xfrm_policy *p;
530 u32 idx;
531 int found;
532
533 idx = (idx_generator | dir);
534 idx_generator += 8;
535 if (idx == 0)
536 idx = 8;
537 list = net->xfrm.policy_byidx + idx_hash(net, idx);
538 found = 0;
539 hlist_for_each_entry(p, entry, list, byidx) {
540 if (p->index == idx) {
541 found = 1;
542 break;
543 }
544 }
545 if (!found)
546 return idx;
547 }
548 }
549
550 static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
551 {
552 u32 *p1 = (u32 *) s1;
553 u32 *p2 = (u32 *) s2;
554 int len = sizeof(struct xfrm_selector) / sizeof(u32);
555 int i;
556
557 for (i = 0; i < len; i++) {
558 if (p1[i] != p2[i])
559 return 1;
560 }
561
562 return 0;
563 }
564
565 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
566 {
567 struct net *net = xp_net(policy);
568 struct xfrm_policy *pol;
569 struct xfrm_policy *delpol;
570 struct hlist_head *chain;
571 struct hlist_node *entry, *newpos;
572 u32 mark = policy->mark.v & policy->mark.m;
573
574 write_lock_bh(&xfrm_policy_lock);
575 chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
576 delpol = NULL;
577 newpos = NULL;
578 hlist_for_each_entry(pol, entry, chain, bydst) {
579 if (pol->type == policy->type &&
580 !selector_cmp(&pol->selector, &policy->selector) &&
581 (mark & pol->mark.m) == pol->mark.v &&
582 xfrm_sec_ctx_match(pol->security, policy->security) &&
583 !WARN_ON(delpol)) {
584 if (excl) {
585 write_unlock_bh(&xfrm_policy_lock);
586 return -EEXIST;
587 }
588 delpol = pol;
589 if (policy->priority > pol->priority)
590 continue;
591 } else if (policy->priority >= pol->priority) {
592 newpos = &pol->bydst;
593 continue;
594 }
595 if (delpol)
596 break;
597 }
598 if (newpos)
599 hlist_add_after(newpos, &policy->bydst);
600 else
601 hlist_add_head(&policy->bydst, chain);
602 xfrm_pol_hold(policy);
603 net->xfrm.policy_count[dir]++;
604 atomic_inc(&flow_cache_genid);
605 rt_genid_bump(net);
606 if (delpol)
607 __xfrm_policy_unlink(delpol, dir);
608 policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir);
609 hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
610 policy->curlft.add_time = get_seconds();
611 policy->curlft.use_time = 0;
612 if (!mod_timer(&policy->timer, jiffies + HZ))
613 xfrm_pol_hold(policy);
614 list_add(&policy->walk.all, &net->xfrm.policy_all);
615 write_unlock_bh(&xfrm_policy_lock);
616
617 if (delpol)
618 xfrm_policy_kill(delpol);
619 else if (xfrm_bydst_should_resize(net, dir, NULL))
620 schedule_work(&net->xfrm.policy_hash_work);
621
622 return 0;
623 }
624 EXPORT_SYMBOL(xfrm_policy_insert);
625
626 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
627 int dir, struct xfrm_selector *sel,
628 struct xfrm_sec_ctx *ctx, int delete,
629 int *err)
630 {
631 struct xfrm_policy *pol, *ret;
632 struct hlist_head *chain;
633 struct hlist_node *entry;
634
635 *err = 0;
636 write_lock_bh(&xfrm_policy_lock);
637 chain = policy_hash_bysel(net, sel, sel->family, dir);
638 ret = NULL;
639 hlist_for_each_entry(pol, entry, chain, bydst) {
640 if (pol->type == type &&
641 (mark & pol->mark.m) == pol->mark.v &&
642 !selector_cmp(sel, &pol->selector) &&
643 xfrm_sec_ctx_match(ctx, pol->security)) {
644 xfrm_pol_hold(pol);
645 if (delete) {
646 *err = security_xfrm_policy_delete(
647 pol->security);
648 if (*err) {
649 write_unlock_bh(&xfrm_policy_lock);
650 return pol;
651 }
652 __xfrm_policy_unlink(pol, dir);
653 }
654 ret = pol;
655 break;
656 }
657 }
658 write_unlock_bh(&xfrm_policy_lock);
659
660 if (ret && delete)
661 xfrm_policy_kill(ret);
662 return ret;
663 }
664 EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
665
666 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
667 int dir, u32 id, int delete, int *err)
668 {
669 struct xfrm_policy *pol, *ret;
670 struct hlist_head *chain;
671 struct hlist_node *entry;
672
673 *err = -ENOENT;
674 if (xfrm_policy_id2dir(id) != dir)
675 return NULL;
676
677 *err = 0;
678 write_lock_bh(&xfrm_policy_lock);
679 chain = net->xfrm.policy_byidx + idx_hash(net, id);
680 ret = NULL;
681 hlist_for_each_entry(pol, entry, chain, byidx) {
682 if (pol->type == type && pol->index == id &&
683 (mark & pol->mark.m) == pol->mark.v) {
684 xfrm_pol_hold(pol);
685 if (delete) {
686 *err = security_xfrm_policy_delete(
687 pol->security);
688 if (*err) {
689 write_unlock_bh(&xfrm_policy_lock);
690 return pol;
691 }
692 __xfrm_policy_unlink(pol, dir);
693 }
694 ret = pol;
695 break;
696 }
697 }
698 write_unlock_bh(&xfrm_policy_lock);
699
700 if (ret && delete)
701 xfrm_policy_kill(ret);
702 return ret;
703 }
704 EXPORT_SYMBOL(xfrm_policy_byid);
705
706 #ifdef CONFIG_SECURITY_NETWORK_XFRM
707 static inline int
708 xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
709 {
710 int dir, err = 0;
711
712 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
713 struct xfrm_policy *pol;
714 struct hlist_node *entry;
715 int i;
716
717 hlist_for_each_entry(pol, entry,
718 &net->xfrm.policy_inexact[dir], bydst) {
719 if (pol->type != type)
720 continue;
721 err = security_xfrm_policy_delete(pol->security);
722 if (err) {
723 xfrm_audit_policy_delete(pol, 0,
724 audit_info->loginuid,
725 audit_info->sessionid,
726 audit_info->secid);
727 return err;
728 }
729 }
730 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
731 hlist_for_each_entry(pol, entry,
732 net->xfrm.policy_bydst[dir].table + i,
733 bydst) {
734 if (pol->type != type)
735 continue;
736 err = security_xfrm_policy_delete(
737 pol->security);
738 if (err) {
739 xfrm_audit_policy_delete(pol, 0,
740 audit_info->loginuid,
741 audit_info->sessionid,
742 audit_info->secid);
743 return err;
744 }
745 }
746 }
747 }
748 return err;
749 }
750 #else
751 static inline int
752 xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
753 {
754 return 0;
755 }
756 #endif
757
758 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info)
759 {
760 int dir, err = 0, cnt = 0;
761
762 write_lock_bh(&xfrm_policy_lock);
763
764 err = xfrm_policy_flush_secctx_check(net, type, audit_info);
765 if (err)
766 goto out;
767
768 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
769 struct xfrm_policy *pol;
770 struct hlist_node *entry;
771 int i;
772
773 again1:
774 hlist_for_each_entry(pol, entry,
775 &net->xfrm.policy_inexact[dir], bydst) {
776 if (pol->type != type)
777 continue;
778 __xfrm_policy_unlink(pol, dir);
779 write_unlock_bh(&xfrm_policy_lock);
780 cnt++;
781
782 xfrm_audit_policy_delete(pol, 1, audit_info->loginuid,
783 audit_info->sessionid,
784 audit_info->secid);
785
786 xfrm_policy_kill(pol);
787
788 write_lock_bh(&xfrm_policy_lock);
789 goto again1;
790 }
791
792 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
793 again2:
794 hlist_for_each_entry(pol, entry,
795 net->xfrm.policy_bydst[dir].table + i,
796 bydst) {
797 if (pol->type != type)
798 continue;
799 __xfrm_policy_unlink(pol, dir);
800 write_unlock_bh(&xfrm_policy_lock);
801 cnt++;
802
803 xfrm_audit_policy_delete(pol, 1,
804 audit_info->loginuid,
805 audit_info->sessionid,
806 audit_info->secid);
807 xfrm_policy_kill(pol);
808
809 write_lock_bh(&xfrm_policy_lock);
810 goto again2;
811 }
812 }
813
814 }
815 if (!cnt)
816 err = -ESRCH;
817 out:
818 write_unlock_bh(&xfrm_policy_lock);
819 return err;
820 }
821 EXPORT_SYMBOL(xfrm_policy_flush);
822
823 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
824 int (*func)(struct xfrm_policy *, int, int, void*),
825 void *data)
826 {
827 struct xfrm_policy *pol;
828 struct xfrm_policy_walk_entry *x;
829 int error = 0;
830
831 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
832 walk->type != XFRM_POLICY_TYPE_ANY)
833 return -EINVAL;
834
835 if (list_empty(&walk->walk.all) && walk->seq != 0)
836 return 0;
837
838 write_lock_bh(&xfrm_policy_lock);
839 if (list_empty(&walk->walk.all))
840 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
841 else
842 x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all);
843 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
844 if (x->dead)
845 continue;
846 pol = container_of(x, struct xfrm_policy, walk);
847 if (walk->type != XFRM_POLICY_TYPE_ANY &&
848 walk->type != pol->type)
849 continue;
850 error = func(pol, xfrm_policy_id2dir(pol->index),
851 walk->seq, data);
852 if (error) {
853 list_move_tail(&walk->walk.all, &x->all);
854 goto out;
855 }
856 walk->seq++;
857 }
858 if (walk->seq == 0) {
859 error = -ENOENT;
860 goto out;
861 }
862 list_del_init(&walk->walk.all);
863 out:
864 write_unlock_bh(&xfrm_policy_lock);
865 return error;
866 }
867 EXPORT_SYMBOL(xfrm_policy_walk);
868
869 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
870 {
871 INIT_LIST_HEAD(&walk->walk.all);
872 walk->walk.dead = 1;
873 walk->type = type;
874 walk->seq = 0;
875 }
876 EXPORT_SYMBOL(xfrm_policy_walk_init);
877
878 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk)
879 {
880 if (list_empty(&walk->walk.all))
881 return;
882
883 write_lock_bh(&xfrm_policy_lock);
884 list_del(&walk->walk.all);
885 write_unlock_bh(&xfrm_policy_lock);
886 }
887 EXPORT_SYMBOL(xfrm_policy_walk_done);
888
889 /*
890 * Find policy to apply to this flow.
891 *
892 * Returns 0 if policy found, else an -errno.
893 */
894 static int xfrm_policy_match(const struct xfrm_policy *pol,
895 const struct flowi *fl,
896 u8 type, u16 family, int dir)
897 {
898 const struct xfrm_selector *sel = &pol->selector;
899 int ret = -ESRCH;
900 bool match;
901
902 if (pol->family != family ||
903 (fl->flowi_mark & pol->mark.m) != pol->mark.v ||
904 pol->type != type)
905 return ret;
906
907 match = xfrm_selector_match(sel, fl, family);
908 if (match)
909 ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid,
910 dir);
911
912 return ret;
913 }
914
915 static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
916 const struct flowi *fl,
917 u16 family, u8 dir)
918 {
919 int err;
920 struct xfrm_policy *pol, *ret;
921 const xfrm_address_t *daddr, *saddr;
922 struct hlist_node *entry;
923 struct hlist_head *chain;
924 u32 priority = ~0U;
925
926 daddr = xfrm_flowi_daddr(fl, family);
927 saddr = xfrm_flowi_saddr(fl, family);
928 if (unlikely(!daddr || !saddr))
929 return NULL;
930
931 read_lock_bh(&xfrm_policy_lock);
932 chain = policy_hash_direct(net, daddr, saddr, family, dir);
933 ret = NULL;
934 hlist_for_each_entry(pol, entry, chain, bydst) {
935 err = xfrm_policy_match(pol, fl, type, family, dir);
936 if (err) {
937 if (err == -ESRCH)
938 continue;
939 else {
940 ret = ERR_PTR(err);
941 goto fail;
942 }
943 } else {
944 ret = pol;
945 priority = ret->priority;
946 break;
947 }
948 }
949 chain = &net->xfrm.policy_inexact[dir];
950 hlist_for_each_entry(pol, entry, chain, bydst) {
951 err = xfrm_policy_match(pol, fl, type, family, dir);
952 if (err) {
953 if (err == -ESRCH)
954 continue;
955 else {
956 ret = ERR_PTR(err);
957 goto fail;
958 }
959 } else if (pol->priority < priority) {
960 ret = pol;
961 break;
962 }
963 }
964 if (ret)
965 xfrm_pol_hold(ret);
966 fail:
967 read_unlock_bh(&xfrm_policy_lock);
968
969 return ret;
970 }
971
972 static struct xfrm_policy *
973 __xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir)
974 {
975 #ifdef CONFIG_XFRM_SUB_POLICY
976 struct xfrm_policy *pol;
977
978 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir);
979 if (pol != NULL)
980 return pol;
981 #endif
982 return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir);
983 }
984
985 static struct flow_cache_object *
986 xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family,
987 u8 dir, struct flow_cache_object *old_obj, void *ctx)
988 {
989 struct xfrm_policy *pol;
990
991 if (old_obj)
992 xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo));
993
994 pol = __xfrm_policy_lookup(net, fl, family, dir);
995 if (IS_ERR_OR_NULL(pol))
996 return ERR_CAST(pol);
997
998 /* Resolver returns two references:
999 * one for cache and one for caller of flow_cache_lookup() */
1000 xfrm_pol_hold(pol);
1001
1002 return &pol->flo;
1003 }
1004
1005 static inline int policy_to_flow_dir(int dir)
1006 {
1007 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
1008 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1009 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1010 return dir;
1011 switch (dir) {
1012 default:
1013 case XFRM_POLICY_IN:
1014 return FLOW_DIR_IN;
1015 case XFRM_POLICY_OUT:
1016 return FLOW_DIR_OUT;
1017 case XFRM_POLICY_FWD:
1018 return FLOW_DIR_FWD;
1019 }
1020 }
1021
1022 static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir,
1023 const struct flowi *fl)
1024 {
1025 struct xfrm_policy *pol;
1026
1027 read_lock_bh(&xfrm_policy_lock);
1028 if ((pol = sk->sk_policy[dir]) != NULL) {
1029 bool match = xfrm_selector_match(&pol->selector, fl,
1030 sk->sk_family);
1031 int err = 0;
1032
1033 if (match) {
1034 if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
1035 pol = NULL;
1036 goto out;
1037 }
1038 err = security_xfrm_policy_lookup(pol->security,
1039 fl->flowi_secid,
1040 policy_to_flow_dir(dir));
1041 if (!err)
1042 xfrm_pol_hold(pol);
1043 else if (err == -ESRCH)
1044 pol = NULL;
1045 else
1046 pol = ERR_PTR(err);
1047 } else
1048 pol = NULL;
1049 }
1050 out:
1051 read_unlock_bh(&xfrm_policy_lock);
1052 return pol;
1053 }
1054
1055 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1056 {
1057 struct net *net = xp_net(pol);
1058 struct hlist_head *chain = policy_hash_bysel(net, &pol->selector,
1059 pol->family, dir);
1060
1061 list_add(&pol->walk.all, &net->xfrm.policy_all);
1062 hlist_add_head(&pol->bydst, chain);
1063 hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index));
1064 net->xfrm.policy_count[dir]++;
1065 xfrm_pol_hold(pol);
1066
1067 if (xfrm_bydst_should_resize(net, dir, NULL))
1068 schedule_work(&net->xfrm.policy_hash_work);
1069 }
1070
1071 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1072 int dir)
1073 {
1074 struct net *net = xp_net(pol);
1075
1076 if (hlist_unhashed(&pol->bydst))
1077 return NULL;
1078
1079 hlist_del(&pol->bydst);
1080 hlist_del(&pol->byidx);
1081 list_del(&pol->walk.all);
1082 net->xfrm.policy_count[dir]--;
1083
1084 return pol;
1085 }
1086
1087 int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1088 {
1089 write_lock_bh(&xfrm_policy_lock);
1090 pol = __xfrm_policy_unlink(pol, dir);
1091 write_unlock_bh(&xfrm_policy_lock);
1092 if (pol) {
1093 xfrm_policy_kill(pol);
1094 return 0;
1095 }
1096 return -ENOENT;
1097 }
1098 EXPORT_SYMBOL(xfrm_policy_delete);
1099
1100 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1101 {
1102 struct net *net = xp_net(pol);
1103 struct xfrm_policy *old_pol;
1104
1105 #ifdef CONFIG_XFRM_SUB_POLICY
1106 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1107 return -EINVAL;
1108 #endif
1109
1110 write_lock_bh(&xfrm_policy_lock);
1111 old_pol = sk->sk_policy[dir];
1112 sk->sk_policy[dir] = pol;
1113 if (pol) {
1114 pol->curlft.add_time = get_seconds();
1115 pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir);
1116 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
1117 }
1118 if (old_pol)
1119 /* Unlinking succeeds always. This is the only function
1120 * allowed to delete or replace socket policy.
1121 */
1122 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
1123 write_unlock_bh(&xfrm_policy_lock);
1124
1125 if (old_pol) {
1126 xfrm_policy_kill(old_pol);
1127 }
1128 return 0;
1129 }
1130
1131 static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir)
1132 {
1133 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
1134
1135 if (newp) {
1136 newp->selector = old->selector;
1137 if (security_xfrm_policy_clone(old->security,
1138 &newp->security)) {
1139 kfree(newp);
1140 return NULL; /* ENOMEM */
1141 }
1142 newp->lft = old->lft;
1143 newp->curlft = old->curlft;
1144 newp->mark = old->mark;
1145 newp->action = old->action;
1146 newp->flags = old->flags;
1147 newp->xfrm_nr = old->xfrm_nr;
1148 newp->index = old->index;
1149 newp->type = old->type;
1150 memcpy(newp->xfrm_vec, old->xfrm_vec,
1151 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1152 write_lock_bh(&xfrm_policy_lock);
1153 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
1154 write_unlock_bh(&xfrm_policy_lock);
1155 xfrm_pol_put(newp);
1156 }
1157 return newp;
1158 }
1159
1160 int __xfrm_sk_clone_policy(struct sock *sk)
1161 {
1162 struct xfrm_policy *p0 = sk->sk_policy[0],
1163 *p1 = sk->sk_policy[1];
1164
1165 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1166 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1167 return -ENOMEM;
1168 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1169 return -ENOMEM;
1170 return 0;
1171 }
1172
1173 static int
1174 xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote,
1175 unsigned short family)
1176 {
1177 int err;
1178 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1179
1180 if (unlikely(afinfo == NULL))
1181 return -EINVAL;
1182 err = afinfo->get_saddr(net, local, remote);
1183 xfrm_policy_put_afinfo(afinfo);
1184 return err;
1185 }
1186
1187 /* Resolve list of templates for the flow, given policy. */
1188
1189 static int
1190 xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl,
1191 struct xfrm_state **xfrm, unsigned short family)
1192 {
1193 struct net *net = xp_net(policy);
1194 int nx;
1195 int i, error;
1196 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1197 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
1198 xfrm_address_t tmp;
1199
1200 for (nx=0, i = 0; i < policy->xfrm_nr; i++) {
1201 struct xfrm_state *x;
1202 xfrm_address_t *remote = daddr;
1203 xfrm_address_t *local = saddr;
1204 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1205
1206 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1207 tmpl->mode == XFRM_MODE_BEET) {
1208 remote = &tmpl->id.daddr;
1209 local = &tmpl->saddr;
1210 if (xfrm_addr_any(local, tmpl->encap_family)) {
1211 error = xfrm_get_saddr(net, &tmp, remote, tmpl->encap_family);
1212 if (error)
1213 goto fail;
1214 local = &tmp;
1215 }
1216 }
1217
1218 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1219
1220 if (x && x->km.state == XFRM_STATE_VALID) {
1221 xfrm[nx++] = x;
1222 daddr = remote;
1223 saddr = local;
1224 continue;
1225 }
1226 if (x) {
1227 error = (x->km.state == XFRM_STATE_ERROR ?
1228 -EINVAL : -EAGAIN);
1229 xfrm_state_put(x);
1230 }
1231 else if (error == -ESRCH)
1232 error = -EAGAIN;
1233
1234 if (!tmpl->optional)
1235 goto fail;
1236 }
1237 return nx;
1238
1239 fail:
1240 for (nx--; nx>=0; nx--)
1241 xfrm_state_put(xfrm[nx]);
1242 return error;
1243 }
1244
1245 static int
1246 xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl,
1247 struct xfrm_state **xfrm, unsigned short family)
1248 {
1249 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1250 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
1251 int cnx = 0;
1252 int error;
1253 int ret;
1254 int i;
1255
1256 for (i = 0; i < npols; i++) {
1257 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1258 error = -ENOBUFS;
1259 goto fail;
1260 }
1261
1262 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
1263 if (ret < 0) {
1264 error = ret;
1265 goto fail;
1266 } else
1267 cnx += ret;
1268 }
1269
1270 /* found states are sorted for outbound processing */
1271 if (npols > 1)
1272 xfrm_state_sort(xfrm, tpp, cnx, family);
1273
1274 return cnx;
1275
1276 fail:
1277 for (cnx--; cnx>=0; cnx--)
1278 xfrm_state_put(tpp[cnx]);
1279 return error;
1280
1281 }
1282
1283 /* Check that the bundle accepts the flow and its components are
1284 * still valid.
1285 */
1286
1287 static inline int xfrm_get_tos(const struct flowi *fl, int family)
1288 {
1289 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1290 int tos;
1291
1292 if (!afinfo)
1293 return -EINVAL;
1294
1295 tos = afinfo->get_tos(fl);
1296
1297 xfrm_policy_put_afinfo(afinfo);
1298
1299 return tos;
1300 }
1301
1302 static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo)
1303 {
1304 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1305 struct dst_entry *dst = &xdst->u.dst;
1306
1307 if (xdst->route == NULL) {
1308 /* Dummy bundle - if it has xfrms we were not
1309 * able to build bundle as template resolution failed.
1310 * It means we need to try again resolving. */
1311 if (xdst->num_xfrms > 0)
1312 return NULL;
1313 } else {
1314 /* Real bundle */
1315 if (stale_bundle(dst))
1316 return NULL;
1317 }
1318
1319 dst_hold(dst);
1320 return flo;
1321 }
1322
1323 static int xfrm_bundle_flo_check(struct flow_cache_object *flo)
1324 {
1325 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1326 struct dst_entry *dst = &xdst->u.dst;
1327
1328 if (!xdst->route)
1329 return 0;
1330 if (stale_bundle(dst))
1331 return 0;
1332
1333 return 1;
1334 }
1335
1336 static void xfrm_bundle_flo_delete(struct flow_cache_object *flo)
1337 {
1338 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1339 struct dst_entry *dst = &xdst->u.dst;
1340
1341 dst_free(dst);
1342 }
1343
1344 static const struct flow_cache_ops xfrm_bundle_fc_ops = {
1345 .get = xfrm_bundle_flo_get,
1346 .check = xfrm_bundle_flo_check,
1347 .delete = xfrm_bundle_flo_delete,
1348 };
1349
1350 static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
1351 {
1352 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1353 struct dst_ops *dst_ops;
1354 struct xfrm_dst *xdst;
1355
1356 if (!afinfo)
1357 return ERR_PTR(-EINVAL);
1358
1359 switch (family) {
1360 case AF_INET:
1361 dst_ops = &net->xfrm.xfrm4_dst_ops;
1362 break;
1363 #if IS_ENABLED(CONFIG_IPV6)
1364 case AF_INET6:
1365 dst_ops = &net->xfrm.xfrm6_dst_ops;
1366 break;
1367 #endif
1368 default:
1369 BUG();
1370 }
1371 xdst = dst_alloc(dst_ops, NULL, 0, DST_OBSOLETE_NONE, 0);
1372
1373 if (likely(xdst)) {
1374 struct dst_entry *dst = &xdst->u.dst;
1375
1376 memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst));
1377 xdst->flo.ops = &xfrm_bundle_fc_ops;
1378 if (afinfo->init_dst)
1379 afinfo->init_dst(net, xdst);
1380 } else
1381 xdst = ERR_PTR(-ENOBUFS);
1382
1383 xfrm_policy_put_afinfo(afinfo);
1384
1385 return xdst;
1386 }
1387
1388 static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1389 int nfheader_len)
1390 {
1391 struct xfrm_policy_afinfo *afinfo =
1392 xfrm_policy_get_afinfo(dst->ops->family);
1393 int err;
1394
1395 if (!afinfo)
1396 return -EINVAL;
1397
1398 err = afinfo->init_path(path, dst, nfheader_len);
1399
1400 xfrm_policy_put_afinfo(afinfo);
1401
1402 return err;
1403 }
1404
1405 static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
1406 const struct flowi *fl)
1407 {
1408 struct xfrm_policy_afinfo *afinfo =
1409 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1410 int err;
1411
1412 if (!afinfo)
1413 return -EINVAL;
1414
1415 err = afinfo->fill_dst(xdst, dev, fl);
1416
1417 xfrm_policy_put_afinfo(afinfo);
1418
1419 return err;
1420 }
1421
1422
1423 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1424 * all the metrics... Shortly, bundle a bundle.
1425 */
1426
1427 static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1428 struct xfrm_state **xfrm, int nx,
1429 const struct flowi *fl,
1430 struct dst_entry *dst)
1431 {
1432 struct net *net = xp_net(policy);
1433 unsigned long now = jiffies;
1434 struct net_device *dev;
1435 struct xfrm_mode *inner_mode;
1436 struct dst_entry *dst_prev = NULL;
1437 struct dst_entry *dst0 = NULL;
1438 int i = 0;
1439 int err;
1440 int header_len = 0;
1441 int nfheader_len = 0;
1442 int trailer_len = 0;
1443 int tos;
1444 int family = policy->selector.family;
1445 xfrm_address_t saddr, daddr;
1446
1447 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
1448
1449 tos = xfrm_get_tos(fl, family);
1450 err = tos;
1451 if (tos < 0)
1452 goto put_states;
1453
1454 dst_hold(dst);
1455
1456 for (; i < nx; i++) {
1457 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
1458 struct dst_entry *dst1 = &xdst->u.dst;
1459
1460 err = PTR_ERR(xdst);
1461 if (IS_ERR(xdst)) {
1462 dst_release(dst);
1463 goto put_states;
1464 }
1465
1466 if (xfrm[i]->sel.family == AF_UNSPEC) {
1467 inner_mode = xfrm_ip2inner_mode(xfrm[i],
1468 xfrm_af2proto(family));
1469 if (!inner_mode) {
1470 err = -EAFNOSUPPORT;
1471 dst_release(dst);
1472 goto put_states;
1473 }
1474 } else
1475 inner_mode = xfrm[i]->inner_mode;
1476
1477 if (!dst_prev)
1478 dst0 = dst1;
1479 else {
1480 dst_prev->child = dst_clone(dst1);
1481 dst1->flags |= DST_NOHASH;
1482 }
1483
1484 xdst->route = dst;
1485 dst_copy_metrics(dst1, dst);
1486
1487 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1488 family = xfrm[i]->props.family;
1489 dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr,
1490 family);
1491 err = PTR_ERR(dst);
1492 if (IS_ERR(dst))
1493 goto put_states;
1494 } else
1495 dst_hold(dst);
1496
1497 dst1->xfrm = xfrm[i];
1498 xdst->xfrm_genid = xfrm[i]->genid;
1499
1500 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
1501 dst1->flags |= DST_HOST;
1502 dst1->lastuse = now;
1503
1504 dst1->input = dst_discard;
1505 dst1->output = inner_mode->afinfo->output;
1506
1507 dst1->next = dst_prev;
1508 dst_prev = dst1;
1509
1510 header_len += xfrm[i]->props.header_len;
1511 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1512 nfheader_len += xfrm[i]->props.header_len;
1513 trailer_len += xfrm[i]->props.trailer_len;
1514 }
1515
1516 dst_prev->child = dst;
1517 dst0->path = dst;
1518
1519 err = -ENODEV;
1520 dev = dst->dev;
1521 if (!dev)
1522 goto free_dst;
1523
1524 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
1525 xfrm_init_pmtu(dst_prev);
1526
1527 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1528 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1529
1530 err = xfrm_fill_dst(xdst, dev, fl);
1531 if (err)
1532 goto free_dst;
1533
1534 dst_prev->header_len = header_len;
1535 dst_prev->trailer_len = trailer_len;
1536 header_len -= xdst->u.dst.xfrm->props.header_len;
1537 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1538 }
1539
1540 out:
1541 return dst0;
1542
1543 put_states:
1544 for (; i < nx; i++)
1545 xfrm_state_put(xfrm[i]);
1546 free_dst:
1547 if (dst0)
1548 dst_free(dst0);
1549 dst0 = ERR_PTR(err);
1550 goto out;
1551 }
1552
1553 static int inline
1554 xfrm_dst_alloc_copy(void **target, const void *src, int size)
1555 {
1556 if (!*target) {
1557 *target = kmalloc(size, GFP_ATOMIC);
1558 if (!*target)
1559 return -ENOMEM;
1560 }
1561 memcpy(*target, src, size);
1562 return 0;
1563 }
1564
1565 static int inline
1566 xfrm_dst_update_parent(struct dst_entry *dst, const struct xfrm_selector *sel)
1567 {
1568 #ifdef CONFIG_XFRM_SUB_POLICY
1569 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1570 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1571 sel, sizeof(*sel));
1572 #else
1573 return 0;
1574 #endif
1575 }
1576
1577 static int inline
1578 xfrm_dst_update_origin(struct dst_entry *dst, const struct flowi *fl)
1579 {
1580 #ifdef CONFIG_XFRM_SUB_POLICY
1581 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1582 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1583 #else
1584 return 0;
1585 #endif
1586 }
1587
1588 static int xfrm_expand_policies(const struct flowi *fl, u16 family,
1589 struct xfrm_policy **pols,
1590 int *num_pols, int *num_xfrms)
1591 {
1592 int i;
1593
1594 if (*num_pols == 0 || !pols[0]) {
1595 *num_pols = 0;
1596 *num_xfrms = 0;
1597 return 0;
1598 }
1599 if (IS_ERR(pols[0]))
1600 return PTR_ERR(pols[0]);
1601
1602 *num_xfrms = pols[0]->xfrm_nr;
1603
1604 #ifdef CONFIG_XFRM_SUB_POLICY
1605 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1606 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1607 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1608 XFRM_POLICY_TYPE_MAIN,
1609 fl, family,
1610 XFRM_POLICY_OUT);
1611 if (pols[1]) {
1612 if (IS_ERR(pols[1])) {
1613 xfrm_pols_put(pols, *num_pols);
1614 return PTR_ERR(pols[1]);
1615 }
1616 (*num_pols) ++;
1617 (*num_xfrms) += pols[1]->xfrm_nr;
1618 }
1619 }
1620 #endif
1621 for (i = 0; i < *num_pols; i++) {
1622 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1623 *num_xfrms = -1;
1624 break;
1625 }
1626 }
1627
1628 return 0;
1629
1630 }
1631
1632 static struct xfrm_dst *
1633 xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
1634 const struct flowi *fl, u16 family,
1635 struct dst_entry *dst_orig)
1636 {
1637 struct net *net = xp_net(pols[0]);
1638 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1639 struct dst_entry *dst;
1640 struct xfrm_dst *xdst;
1641 int err;
1642
1643 /* Try to instantiate a bundle */
1644 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
1645 if (err <= 0) {
1646 if (err != 0 && err != -EAGAIN)
1647 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1648 return ERR_PTR(err);
1649 }
1650
1651 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1652 if (IS_ERR(dst)) {
1653 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1654 return ERR_CAST(dst);
1655 }
1656
1657 xdst = (struct xfrm_dst *)dst;
1658 xdst->num_xfrms = err;
1659 if (num_pols > 1)
1660 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1661 else
1662 err = xfrm_dst_update_origin(dst, fl);
1663 if (unlikely(err)) {
1664 dst_free(dst);
1665 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1666 return ERR_PTR(err);
1667 }
1668
1669 xdst->num_pols = num_pols;
1670 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols);
1671 xdst->policy_genid = atomic_read(&pols[0]->genid);
1672
1673 return xdst;
1674 }
1675
1676 static struct flow_cache_object *
1677 xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir,
1678 struct flow_cache_object *oldflo, void *ctx)
1679 {
1680 struct dst_entry *dst_orig = (struct dst_entry *)ctx;
1681 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1682 struct xfrm_dst *xdst, *new_xdst;
1683 int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
1684
1685 /* Check if the policies from old bundle are usable */
1686 xdst = NULL;
1687 if (oldflo) {
1688 xdst = container_of(oldflo, struct xfrm_dst, flo);
1689 num_pols = xdst->num_pols;
1690 num_xfrms = xdst->num_xfrms;
1691 pol_dead = 0;
1692 for (i = 0; i < num_pols; i++) {
1693 pols[i] = xdst->pols[i];
1694 pol_dead |= pols[i]->walk.dead;
1695 }
1696 if (pol_dead) {
1697 dst_free(&xdst->u.dst);
1698 xdst = NULL;
1699 num_pols = 0;
1700 num_xfrms = 0;
1701 oldflo = NULL;
1702 }
1703 }
1704
1705 /* Resolve policies to use if we couldn't get them from
1706 * previous cache entry */
1707 if (xdst == NULL) {
1708 num_pols = 1;
1709 pols[0] = __xfrm_policy_lookup(net, fl, family, dir);
1710 err = xfrm_expand_policies(fl, family, pols,
1711 &num_pols, &num_xfrms);
1712 if (err < 0)
1713 goto inc_error;
1714 if (num_pols == 0)
1715 return NULL;
1716 if (num_xfrms <= 0)
1717 goto make_dummy_bundle;
1718 }
1719
1720 new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, dst_orig);
1721 if (IS_ERR(new_xdst)) {
1722 err = PTR_ERR(new_xdst);
1723 if (err != -EAGAIN)
1724 goto error;
1725 if (oldflo == NULL)
1726 goto make_dummy_bundle;
1727 dst_hold(&xdst->u.dst);
1728 return oldflo;
1729 } else if (new_xdst == NULL) {
1730 num_xfrms = 0;
1731 if (oldflo == NULL)
1732 goto make_dummy_bundle;
1733 xdst->num_xfrms = 0;
1734 dst_hold(&xdst->u.dst);
1735 return oldflo;
1736 }
1737
1738 /* Kill the previous bundle */
1739 if (xdst) {
1740 /* The policies were stolen for newly generated bundle */
1741 xdst->num_pols = 0;
1742 dst_free(&xdst->u.dst);
1743 }
1744
1745 /* Flow cache does not have reference, it dst_free()'s,
1746 * but we do need to return one reference for original caller */
1747 dst_hold(&new_xdst->u.dst);
1748 return &new_xdst->flo;
1749
1750 make_dummy_bundle:
1751 /* We found policies, but there's no bundles to instantiate:
1752 * either because the policy blocks, has no transformations or
1753 * we could not build template (no xfrm_states).*/
1754 xdst = xfrm_alloc_dst(net, family);
1755 if (IS_ERR(xdst)) {
1756 xfrm_pols_put(pols, num_pols);
1757 return ERR_CAST(xdst);
1758 }
1759 xdst->num_pols = num_pols;
1760 xdst->num_xfrms = num_xfrms;
1761 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols);
1762
1763 dst_hold(&xdst->u.dst);
1764 return &xdst->flo;
1765
1766 inc_error:
1767 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1768 error:
1769 if (xdst != NULL)
1770 dst_free(&xdst->u.dst);
1771 else
1772 xfrm_pols_put(pols, num_pols);
1773 return ERR_PTR(err);
1774 }
1775
1776 static struct dst_entry *make_blackhole(struct net *net, u16 family,
1777 struct dst_entry *dst_orig)
1778 {
1779 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1780 struct dst_entry *ret;
1781
1782 if (!afinfo) {
1783 dst_release(dst_orig);
1784 return ERR_PTR(-EINVAL);
1785 } else {
1786 ret = afinfo->blackhole_route(net, dst_orig);
1787 }
1788 xfrm_policy_put_afinfo(afinfo);
1789
1790 return ret;
1791 }
1792
1793 /* Main function: finds/creates a bundle for given flow.
1794 *
1795 * At the moment we eat a raw IP route. Mostly to speed up lookups
1796 * on interfaces with disabled IPsec.
1797 */
1798 struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
1799 const struct flowi *fl,
1800 struct sock *sk, int flags)
1801 {
1802 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1803 struct flow_cache_object *flo;
1804 struct xfrm_dst *xdst;
1805 struct dst_entry *dst, *route;
1806 u16 family = dst_orig->ops->family;
1807 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
1808 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
1809
1810 restart:
1811 dst = NULL;
1812 xdst = NULL;
1813 route = NULL;
1814
1815 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
1816 num_pols = 1;
1817 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
1818 err = xfrm_expand_policies(fl, family, pols,
1819 &num_pols, &num_xfrms);
1820 if (err < 0)
1821 goto dropdst;
1822
1823 if (num_pols) {
1824 if (num_xfrms <= 0) {
1825 drop_pols = num_pols;
1826 goto no_transform;
1827 }
1828
1829 xdst = xfrm_resolve_and_create_bundle(
1830 pols, num_pols, fl,
1831 family, dst_orig);
1832 if (IS_ERR(xdst)) {
1833 xfrm_pols_put(pols, num_pols);
1834 err = PTR_ERR(xdst);
1835 goto dropdst;
1836 } else if (xdst == NULL) {
1837 num_xfrms = 0;
1838 drop_pols = num_pols;
1839 goto no_transform;
1840 }
1841
1842 dst_hold(&xdst->u.dst);
1843
1844 spin_lock_bh(&xfrm_policy_sk_bundle_lock);
1845 xdst->u.dst.next = xfrm_policy_sk_bundles;
1846 xfrm_policy_sk_bundles = &xdst->u.dst;
1847 spin_unlock_bh(&xfrm_policy_sk_bundle_lock);
1848
1849 route = xdst->route;
1850 }
1851 }
1852
1853 if (xdst == NULL) {
1854 /* To accelerate a bit... */
1855 if ((dst_orig->flags & DST_NOXFRM) ||
1856 !net->xfrm.policy_count[XFRM_POLICY_OUT])
1857 goto nopol;
1858
1859 flo = flow_cache_lookup(net, fl, family, dir,
1860 xfrm_bundle_lookup, dst_orig);
1861 if (flo == NULL)
1862 goto nopol;
1863 if (IS_ERR(flo)) {
1864 err = PTR_ERR(flo);
1865 goto dropdst;
1866 }
1867 xdst = container_of(flo, struct xfrm_dst, flo);
1868
1869 num_pols = xdst->num_pols;
1870 num_xfrms = xdst->num_xfrms;
1871 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy*) * num_pols);
1872 route = xdst->route;
1873 }
1874
1875 dst = &xdst->u.dst;
1876 if (route == NULL && num_xfrms > 0) {
1877 /* The only case when xfrm_bundle_lookup() returns a
1878 * bundle with null route, is when the template could
1879 * not be resolved. It means policies are there, but
1880 * bundle could not be created, since we don't yet
1881 * have the xfrm_state's. We need to wait for KM to
1882 * negotiate new SA's or bail out with error.*/
1883 if (net->xfrm.sysctl_larval_drop) {
1884 /* EREMOTE tells the caller to generate
1885 * a one-shot blackhole route. */
1886 dst_release(dst);
1887 xfrm_pols_put(pols, drop_pols);
1888 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
1889
1890 return make_blackhole(net, family, dst_orig);
1891 }
1892 if (fl->flowi_flags & FLOWI_FLAG_CAN_SLEEP) {
1893 DECLARE_WAITQUEUE(wait, current);
1894
1895 add_wait_queue(&net->xfrm.km_waitq, &wait);
1896 set_current_state(TASK_INTERRUPTIBLE);
1897 schedule();
1898 set_current_state(TASK_RUNNING);
1899 remove_wait_queue(&net->xfrm.km_waitq, &wait);
1900
1901 if (!signal_pending(current)) {
1902 dst_release(dst);
1903 goto restart;
1904 }
1905
1906 err = -ERESTART;
1907 } else
1908 err = -EAGAIN;
1909
1910 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
1911 goto error;
1912 }
1913
1914 no_transform:
1915 if (num_pols == 0)
1916 goto nopol;
1917
1918 if ((flags & XFRM_LOOKUP_ICMP) &&
1919 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
1920 err = -ENOENT;
1921 goto error;
1922 }
1923
1924 for (i = 0; i < num_pols; i++)
1925 pols[i]->curlft.use_time = get_seconds();
1926
1927 if (num_xfrms < 0) {
1928 /* Prohibit the flow */
1929 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
1930 err = -EPERM;
1931 goto error;
1932 } else if (num_xfrms > 0) {
1933 /* Flow transformed */
1934 dst_release(dst_orig);
1935 } else {
1936 /* Flow passes untransformed */
1937 dst_release(dst);
1938 dst = dst_orig;
1939 }
1940 ok:
1941 xfrm_pols_put(pols, drop_pols);
1942 if (dst && dst->xfrm &&
1943 dst->xfrm->props.mode == XFRM_MODE_TUNNEL)
1944 dst->flags |= DST_XFRM_TUNNEL;
1945 return dst;
1946
1947 nopol:
1948 if (!(flags & XFRM_LOOKUP_ICMP)) {
1949 dst = dst_orig;
1950 goto ok;
1951 }
1952 err = -ENOENT;
1953 error:
1954 dst_release(dst);
1955 dropdst:
1956 dst_release(dst_orig);
1957 xfrm_pols_put(pols, drop_pols);
1958 return ERR_PTR(err);
1959 }
1960 EXPORT_SYMBOL(xfrm_lookup);
1961
1962 static inline int
1963 xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl)
1964 {
1965 struct xfrm_state *x;
1966
1967 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
1968 return 0;
1969 x = skb->sp->xvec[idx];
1970 if (!x->type->reject)
1971 return 0;
1972 return x->type->reject(x, skb, fl);
1973 }
1974
1975 /* When skb is transformed back to its "native" form, we have to
1976 * check policy restrictions. At the moment we make this in maximally
1977 * stupid way. Shame on me. :-) Of course, connected sockets must
1978 * have policy cached at them.
1979 */
1980
1981 static inline int
1982 xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x,
1983 unsigned short family)
1984 {
1985 if (xfrm_state_kern(x))
1986 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
1987 return x->id.proto == tmpl->id.proto &&
1988 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
1989 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
1990 x->props.mode == tmpl->mode &&
1991 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
1992 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
1993 !(x->props.mode != XFRM_MODE_TRANSPORT &&
1994 xfrm_state_addr_cmp(tmpl, x, family));
1995 }
1996
1997 /*
1998 * 0 or more than 0 is returned when validation is succeeded (either bypass
1999 * because of optional transport mode, or next index of the mathced secpath
2000 * state with the template.
2001 * -1 is returned when no matching template is found.
2002 * Otherwise "-2 - errored_index" is returned.
2003 */
2004 static inline int
2005 xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start,
2006 unsigned short family)
2007 {
2008 int idx = start;
2009
2010 if (tmpl->optional) {
2011 if (tmpl->mode == XFRM_MODE_TRANSPORT)
2012 return start;
2013 } else
2014 start = -1;
2015 for (; idx < sp->len; idx++) {
2016 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
2017 return ++idx;
2018 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
2019 if (start == -1)
2020 start = -2-idx;
2021 break;
2022 }
2023 }
2024 return start;
2025 }
2026
2027 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
2028 unsigned int family, int reverse)
2029 {
2030 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
2031 int err;
2032
2033 if (unlikely(afinfo == NULL))
2034 return -EAFNOSUPPORT;
2035
2036 afinfo->decode_session(skb, fl, reverse);
2037 err = security_xfrm_decode_session(skb, &fl->flowi_secid);
2038 xfrm_policy_put_afinfo(afinfo);
2039 return err;
2040 }
2041 EXPORT_SYMBOL(__xfrm_decode_session);
2042
2043 static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp)
2044 {
2045 for (; k < sp->len; k++) {
2046 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
2047 *idxp = k;
2048 return 1;
2049 }
2050 }
2051
2052 return 0;
2053 }
2054
2055 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
2056 unsigned short family)
2057 {
2058 struct net *net = dev_net(skb->dev);
2059 struct xfrm_policy *pol;
2060 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2061 int npols = 0;
2062 int xfrm_nr;
2063 int pi;
2064 int reverse;
2065 struct flowi fl;
2066 u8 fl_dir;
2067 int xerr_idx = -1;
2068
2069 reverse = dir & ~XFRM_POLICY_MASK;
2070 dir &= XFRM_POLICY_MASK;
2071 fl_dir = policy_to_flow_dir(dir);
2072
2073 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
2074 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
2075 return 0;
2076 }
2077
2078 nf_nat_decode_session(skb, &fl, family);
2079
2080 /* First, check used SA against their selectors. */
2081 if (skb->sp) {
2082 int i;
2083
2084 for (i=skb->sp->len-1; i>=0; i--) {
2085 struct xfrm_state *x = skb->sp->xvec[i];
2086 if (!xfrm_selector_match(&x->sel, &fl, family)) {
2087 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
2088 return 0;
2089 }
2090 }
2091 }
2092
2093 pol = NULL;
2094 if (sk && sk->sk_policy[dir]) {
2095 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
2096 if (IS_ERR(pol)) {
2097 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2098 return 0;
2099 }
2100 }
2101
2102 if (!pol) {
2103 struct flow_cache_object *flo;
2104
2105 flo = flow_cache_lookup(net, &fl, family, fl_dir,
2106 xfrm_policy_lookup, NULL);
2107 if (IS_ERR_OR_NULL(flo))
2108 pol = ERR_CAST(flo);
2109 else
2110 pol = container_of(flo, struct xfrm_policy, flo);
2111 }
2112
2113 if (IS_ERR(pol)) {
2114 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2115 return 0;
2116 }
2117
2118 if (!pol) {
2119 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
2120 xfrm_secpath_reject(xerr_idx, skb, &fl);
2121 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
2122 return 0;
2123 }
2124 return 1;
2125 }
2126
2127 pol->curlft.use_time = get_seconds();
2128
2129 pols[0] = pol;
2130 npols ++;
2131 #ifdef CONFIG_XFRM_SUB_POLICY
2132 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
2133 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
2134 &fl, family,
2135 XFRM_POLICY_IN);
2136 if (pols[1]) {
2137 if (IS_ERR(pols[1])) {
2138 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2139 return 0;
2140 }
2141 pols[1]->curlft.use_time = get_seconds();
2142 npols ++;
2143 }
2144 }
2145 #endif
2146
2147 if (pol->action == XFRM_POLICY_ALLOW) {
2148 struct sec_path *sp;
2149 static struct sec_path dummy;
2150 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
2151 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
2152 struct xfrm_tmpl **tpp = tp;
2153 int ti = 0;
2154 int i, k;
2155
2156 if ((sp = skb->sp) == NULL)
2157 sp = &dummy;
2158
2159 for (pi = 0; pi < npols; pi++) {
2160 if (pols[pi] != pol &&
2161 pols[pi]->action != XFRM_POLICY_ALLOW) {
2162 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2163 goto reject;
2164 }
2165 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
2166 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
2167 goto reject_error;
2168 }
2169 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2170 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2171 }
2172 xfrm_nr = ti;
2173 if (npols > 1) {
2174 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
2175 tpp = stp;
2176 }
2177
2178 /* For each tunnel xfrm, find the first matching tmpl.
2179 * For each tmpl before that, find corresponding xfrm.
2180 * Order is _important_. Later we will implement
2181 * some barriers, but at the moment barriers
2182 * are implied between each two transformations.
2183 */
2184 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2185 k = xfrm_policy_ok(tpp[i], sp, k, family);
2186 if (k < 0) {
2187 if (k < -1)
2188 /* "-2 - errored_index" returned */
2189 xerr_idx = -(2+k);
2190 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2191 goto reject;
2192 }
2193 }
2194
2195 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
2196 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2197 goto reject;
2198 }
2199
2200 xfrm_pols_put(pols, npols);
2201 return 1;
2202 }
2203 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2204
2205 reject:
2206 xfrm_secpath_reject(xerr_idx, skb, &fl);
2207 reject_error:
2208 xfrm_pols_put(pols, npols);
2209 return 0;
2210 }
2211 EXPORT_SYMBOL(__xfrm_policy_check);
2212
2213 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2214 {
2215 struct net *net = dev_net(skb->dev);
2216 struct flowi fl;
2217 struct dst_entry *dst;
2218 int res = 1;
2219
2220 if (xfrm_decode_session(skb, &fl, family) < 0) {
2221 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
2222 return 0;
2223 }
2224
2225 skb_dst_force(skb);
2226
2227 dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, 0);
2228 if (IS_ERR(dst)) {
2229 res = 0;
2230 dst = NULL;
2231 }
2232 skb_dst_set(skb, dst);
2233 return res;
2234 }
2235 EXPORT_SYMBOL(__xfrm_route_forward);
2236
2237 /* Optimize later using cookies and generation ids. */
2238
2239 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2240 {
2241 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
2242 * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to
2243 * get validated by dst_ops->check on every use. We do this
2244 * because when a normal route referenced by an XFRM dst is
2245 * obsoleted we do not go looking around for all parent
2246 * referencing XFRM dsts so that we can invalidate them. It
2247 * is just too much work. Instead we make the checks here on
2248 * every use. For example:
2249 *
2250 * XFRM dst A --> IPv4 dst X
2251 *
2252 * X is the "xdst->route" of A (X is also the "dst->path" of A
2253 * in this example). If X is marked obsolete, "A" will not
2254 * notice. That's what we are validating here via the
2255 * stale_bundle() check.
2256 *
2257 * When a policy's bundle is pruned, we dst_free() the XFRM
2258 * dst which causes it's ->obsolete field to be set to
2259 * DST_OBSOLETE_DEAD. If an XFRM dst has been pruned like
2260 * this, we want to force a new route lookup.
2261 */
2262 if (dst->obsolete < 0 && !stale_bundle(dst))
2263 return dst;
2264
2265 return NULL;
2266 }
2267
2268 static int stale_bundle(struct dst_entry *dst)
2269 {
2270 return !xfrm_bundle_ok((struct xfrm_dst *)dst);
2271 }
2272
2273 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
2274 {
2275 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
2276 dst->dev = dev_net(dev)->loopback_dev;
2277 dev_hold(dst->dev);
2278 dev_put(dev);
2279 }
2280 }
2281 EXPORT_SYMBOL(xfrm_dst_ifdown);
2282
2283 static void xfrm_link_failure(struct sk_buff *skb)
2284 {
2285 /* Impossible. Such dst must be popped before reaches point of failure. */
2286 }
2287
2288 static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2289 {
2290 if (dst) {
2291 if (dst->obsolete) {
2292 dst_release(dst);
2293 dst = NULL;
2294 }
2295 }
2296 return dst;
2297 }
2298
2299 static void __xfrm_garbage_collect(struct net *net)
2300 {
2301 struct dst_entry *head, *next;
2302
2303 spin_lock_bh(&xfrm_policy_sk_bundle_lock);
2304 head = xfrm_policy_sk_bundles;
2305 xfrm_policy_sk_bundles = NULL;
2306 spin_unlock_bh(&xfrm_policy_sk_bundle_lock);
2307
2308 while (head) {
2309 next = head->next;
2310 dst_free(head);
2311 head = next;
2312 }
2313 }
2314
2315 static void xfrm_garbage_collect(struct net *net)
2316 {
2317 flow_cache_flush();
2318 __xfrm_garbage_collect(net);
2319 }
2320
2321 static void xfrm_garbage_collect_deferred(struct net *net)
2322 {
2323 flow_cache_flush_deferred();
2324 __xfrm_garbage_collect(net);
2325 }
2326
2327 static void xfrm_init_pmtu(struct dst_entry *dst)
2328 {
2329 do {
2330 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2331 u32 pmtu, route_mtu_cached;
2332
2333 pmtu = dst_mtu(dst->child);
2334 xdst->child_mtu_cached = pmtu;
2335
2336 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2337
2338 route_mtu_cached = dst_mtu(xdst->route);
2339 xdst->route_mtu_cached = route_mtu_cached;
2340
2341 if (pmtu > route_mtu_cached)
2342 pmtu = route_mtu_cached;
2343
2344 dst_metric_set(dst, RTAX_MTU, pmtu);
2345 } while ((dst = dst->next));
2346 }
2347
2348 /* Check that the bundle accepts the flow and its components are
2349 * still valid.
2350 */
2351
2352 static int xfrm_bundle_ok(struct xfrm_dst *first)
2353 {
2354 struct dst_entry *dst = &first->u.dst;
2355 struct xfrm_dst *last;
2356 u32 mtu;
2357
2358 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
2359 (dst->dev && !netif_running(dst->dev)))
2360 return 0;
2361
2362 last = NULL;
2363
2364 do {
2365 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2366
2367 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2368 return 0;
2369 if (xdst->xfrm_genid != dst->xfrm->genid)
2370 return 0;
2371 if (xdst->num_pols > 0 &&
2372 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
2373 return 0;
2374
2375 mtu = dst_mtu(dst->child);
2376 if (xdst->child_mtu_cached != mtu) {
2377 last = xdst;
2378 xdst->child_mtu_cached = mtu;
2379 }
2380
2381 if (!dst_check(xdst->route, xdst->route_cookie))
2382 return 0;
2383 mtu = dst_mtu(xdst->route);
2384 if (xdst->route_mtu_cached != mtu) {
2385 last = xdst;
2386 xdst->route_mtu_cached = mtu;
2387 }
2388
2389 dst = dst->child;
2390 } while (dst->xfrm);
2391
2392 if (likely(!last))
2393 return 1;
2394
2395 mtu = last->child_mtu_cached;
2396 for (;;) {
2397 dst = &last->u.dst;
2398
2399 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2400 if (mtu > last->route_mtu_cached)
2401 mtu = last->route_mtu_cached;
2402 dst_metric_set(dst, RTAX_MTU, mtu);
2403
2404 if (last == first)
2405 break;
2406
2407 last = (struct xfrm_dst *)last->u.dst.next;
2408 last->child_mtu_cached = mtu;
2409 }
2410
2411 return 1;
2412 }
2413
2414 static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
2415 {
2416 return dst_metric_advmss(dst->path);
2417 }
2418
2419 static unsigned int xfrm_mtu(const struct dst_entry *dst)
2420 {
2421 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
2422
2423 return mtu ? : dst_mtu(dst->path);
2424 }
2425
2426 static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst,
2427 struct sk_buff *skb,
2428 const void *daddr)
2429 {
2430 return dst->path->ops->neigh_lookup(dst, skb, daddr);
2431 }
2432
2433 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
2434 {
2435 struct net *net;
2436 int err = 0;
2437 if (unlikely(afinfo == NULL))
2438 return -EINVAL;
2439 if (unlikely(afinfo->family >= NPROTO))
2440 return -EAFNOSUPPORT;
2441 spin_lock(&xfrm_policy_afinfo_lock);
2442 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
2443 err = -ENOBUFS;
2444 else {
2445 struct dst_ops *dst_ops = afinfo->dst_ops;
2446 if (likely(dst_ops->kmem_cachep == NULL))
2447 dst_ops->kmem_cachep = xfrm_dst_cache;
2448 if (likely(dst_ops->check == NULL))
2449 dst_ops->check = xfrm_dst_check;
2450 if (likely(dst_ops->default_advmss == NULL))
2451 dst_ops->default_advmss = xfrm_default_advmss;
2452 if (likely(dst_ops->mtu == NULL))
2453 dst_ops->mtu = xfrm_mtu;
2454 if (likely(dst_ops->negative_advice == NULL))
2455 dst_ops->negative_advice = xfrm_negative_advice;
2456 if (likely(dst_ops->link_failure == NULL))
2457 dst_ops->link_failure = xfrm_link_failure;
2458 if (likely(dst_ops->neigh_lookup == NULL))
2459 dst_ops->neigh_lookup = xfrm_neigh_lookup;
2460 if (likely(afinfo->garbage_collect == NULL))
2461 afinfo->garbage_collect = xfrm_garbage_collect_deferred;
2462 rcu_assign_pointer(xfrm_policy_afinfo[afinfo->family], afinfo);
2463 }
2464 spin_unlock(&xfrm_policy_afinfo_lock);
2465
2466 rtnl_lock();
2467 for_each_net(net) {
2468 struct dst_ops *xfrm_dst_ops;
2469
2470 switch (afinfo->family) {
2471 case AF_INET:
2472 xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops;
2473 break;
2474 #if IS_ENABLED(CONFIG_IPV6)
2475 case AF_INET6:
2476 xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops;
2477 break;
2478 #endif
2479 default:
2480 BUG();
2481 }
2482 *xfrm_dst_ops = *afinfo->dst_ops;
2483 }
2484 rtnl_unlock();
2485
2486 return err;
2487 }
2488 EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2489
2490 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2491 {
2492 int err = 0;
2493 if (unlikely(afinfo == NULL))
2494 return -EINVAL;
2495 if (unlikely(afinfo->family >= NPROTO))
2496 return -EAFNOSUPPORT;
2497 spin_lock(&xfrm_policy_afinfo_lock);
2498 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2499 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2500 err = -EINVAL;
2501 else
2502 RCU_INIT_POINTER(xfrm_policy_afinfo[afinfo->family],
2503 NULL);
2504 }
2505 spin_unlock(&xfrm_policy_afinfo_lock);
2506 if (!err) {
2507 struct dst_ops *dst_ops = afinfo->dst_ops;
2508
2509 synchronize_rcu();
2510
2511 dst_ops->kmem_cachep = NULL;
2512 dst_ops->check = NULL;
2513 dst_ops->negative_advice = NULL;
2514 dst_ops->link_failure = NULL;
2515 afinfo->garbage_collect = NULL;
2516 }
2517 return err;
2518 }
2519 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2520
2521 static void __net_init xfrm_dst_ops_init(struct net *net)
2522 {
2523 struct xfrm_policy_afinfo *afinfo;
2524
2525 rcu_read_lock();
2526 afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET]);
2527 if (afinfo)
2528 net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops;
2529 #if IS_ENABLED(CONFIG_IPV6)
2530 afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET6]);
2531 if (afinfo)
2532 net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops;
2533 #endif
2534 rcu_read_unlock();
2535 }
2536
2537 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2538 {
2539 struct net_device *dev = ptr;
2540
2541 switch (event) {
2542 case NETDEV_DOWN:
2543 xfrm_garbage_collect(dev_net(dev));
2544 }
2545 return NOTIFY_DONE;
2546 }
2547
2548 static struct notifier_block xfrm_dev_notifier = {
2549 .notifier_call = xfrm_dev_event,
2550 };
2551
2552 #ifdef CONFIG_XFRM_STATISTICS
2553 static int __net_init xfrm_statistics_init(struct net *net)
2554 {
2555 int rv;
2556
2557 if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics,
2558 sizeof(struct linux_xfrm_mib),
2559 __alignof__(struct linux_xfrm_mib)) < 0)
2560 return -ENOMEM;
2561 rv = xfrm_proc_init(net);
2562 if (rv < 0)
2563 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
2564 return rv;
2565 }
2566
2567 static void xfrm_statistics_fini(struct net *net)
2568 {
2569 xfrm_proc_fini(net);
2570 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
2571 }
2572 #else
2573 static int __net_init xfrm_statistics_init(struct net *net)
2574 {
2575 return 0;
2576 }
2577
2578 static void xfrm_statistics_fini(struct net *net)
2579 {
2580 }
2581 #endif
2582
2583 static int __net_init xfrm_policy_init(struct net *net)
2584 {
2585 unsigned int hmask, sz;
2586 int dir;
2587
2588 if (net_eq(net, &init_net))
2589 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
2590 sizeof(struct xfrm_dst),
2591 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
2592 NULL);
2593
2594 hmask = 8 - 1;
2595 sz = (hmask+1) * sizeof(struct hlist_head);
2596
2597 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2598 if (!net->xfrm.policy_byidx)
2599 goto out_byidx;
2600 net->xfrm.policy_idx_hmask = hmask;
2601
2602 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2603 struct xfrm_policy_hash *htab;
2604
2605 net->xfrm.policy_count[dir] = 0;
2606 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
2607
2608 htab = &net->xfrm.policy_bydst[dir];
2609 htab->table = xfrm_hash_alloc(sz);
2610 if (!htab->table)
2611 goto out_bydst;
2612 htab->hmask = hmask;
2613 }
2614
2615 INIT_LIST_HEAD(&net->xfrm.policy_all);
2616 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
2617 if (net_eq(net, &init_net))
2618 register_netdevice_notifier(&xfrm_dev_notifier);
2619 return 0;
2620
2621 out_bydst:
2622 for (dir--; dir >= 0; dir--) {
2623 struct xfrm_policy_hash *htab;
2624
2625 htab = &net->xfrm.policy_bydst[dir];
2626 xfrm_hash_free(htab->table, sz);
2627 }
2628 xfrm_hash_free(net->xfrm.policy_byidx, sz);
2629 out_byidx:
2630 return -ENOMEM;
2631 }
2632
2633 static void xfrm_policy_fini(struct net *net)
2634 {
2635 struct xfrm_audit audit_info;
2636 unsigned int sz;
2637 int dir;
2638
2639 flush_work(&net->xfrm.policy_hash_work);
2640 #ifdef CONFIG_XFRM_SUB_POLICY
2641 audit_info.loginuid = INVALID_UID;
2642 audit_info.sessionid = -1;
2643 audit_info.secid = 0;
2644 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info);
2645 #endif
2646 audit_info.loginuid = INVALID_UID;
2647 audit_info.sessionid = -1;
2648 audit_info.secid = 0;
2649 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2650
2651 WARN_ON(!list_empty(&net->xfrm.policy_all));
2652
2653 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2654 struct xfrm_policy_hash *htab;
2655
2656 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
2657
2658 htab = &net->xfrm.policy_bydst[dir];
2659 sz = (htab->hmask + 1) * sizeof(struct hlist_head);
2660 WARN_ON(!hlist_empty(htab->table));
2661 xfrm_hash_free(htab->table, sz);
2662 }
2663
2664 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
2665 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
2666 xfrm_hash_free(net->xfrm.policy_byidx, sz);
2667 }
2668
2669 static int __net_init xfrm_net_init(struct net *net)
2670 {
2671 int rv;
2672
2673 rv = xfrm_statistics_init(net);
2674 if (rv < 0)
2675 goto out_statistics;
2676 rv = xfrm_state_init(net);
2677 if (rv < 0)
2678 goto out_state;
2679 rv = xfrm_policy_init(net);
2680 if (rv < 0)
2681 goto out_policy;
2682 xfrm_dst_ops_init(net);
2683 rv = xfrm_sysctl_init(net);
2684 if (rv < 0)
2685 goto out_sysctl;
2686 return 0;
2687
2688 out_sysctl:
2689 xfrm_policy_fini(net);
2690 out_policy:
2691 xfrm_state_fini(net);
2692 out_state:
2693 xfrm_statistics_fini(net);
2694 out_statistics:
2695 return rv;
2696 }
2697
2698 static void __net_exit xfrm_net_exit(struct net *net)
2699 {
2700 xfrm_sysctl_fini(net);
2701 xfrm_policy_fini(net);
2702 xfrm_state_fini(net);
2703 xfrm_statistics_fini(net);
2704 }
2705
2706 static struct pernet_operations __net_initdata xfrm_net_ops = {
2707 .init = xfrm_net_init,
2708 .exit = xfrm_net_exit,
2709 };
2710
2711 void __init xfrm_init(void)
2712 {
2713 register_pernet_subsys(&xfrm_net_ops);
2714 xfrm_input_init();
2715 }
2716
2717 #ifdef CONFIG_AUDITSYSCALL
2718 static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
2719 struct audit_buffer *audit_buf)
2720 {
2721 struct xfrm_sec_ctx *ctx = xp->security;
2722 struct xfrm_selector *sel = &xp->selector;
2723
2724 if (ctx)
2725 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2726 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2727
2728 switch(sel->family) {
2729 case AF_INET:
2730 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
2731 if (sel->prefixlen_s != 32)
2732 audit_log_format(audit_buf, " src_prefixlen=%d",
2733 sel->prefixlen_s);
2734 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
2735 if (sel->prefixlen_d != 32)
2736 audit_log_format(audit_buf, " dst_prefixlen=%d",
2737 sel->prefixlen_d);
2738 break;
2739 case AF_INET6:
2740 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
2741 if (sel->prefixlen_s != 128)
2742 audit_log_format(audit_buf, " src_prefixlen=%d",
2743 sel->prefixlen_s);
2744 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
2745 if (sel->prefixlen_d != 128)
2746 audit_log_format(audit_buf, " dst_prefixlen=%d",
2747 sel->prefixlen_d);
2748 break;
2749 }
2750 }
2751
2752 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
2753 kuid_t auid, u32 sessionid, u32 secid)
2754 {
2755 struct audit_buffer *audit_buf;
2756
2757 audit_buf = xfrm_audit_start("SPD-add");
2758 if (audit_buf == NULL)
2759 return;
2760 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2761 audit_log_format(audit_buf, " res=%u", result);
2762 xfrm_audit_common_policyinfo(xp, audit_buf);
2763 audit_log_end(audit_buf);
2764 }
2765 EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
2766
2767 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
2768 kuid_t auid, u32 sessionid, u32 secid)
2769 {
2770 struct audit_buffer *audit_buf;
2771
2772 audit_buf = xfrm_audit_start("SPD-delete");
2773 if (audit_buf == NULL)
2774 return;
2775 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2776 audit_log_format(audit_buf, " res=%u", result);
2777 xfrm_audit_common_policyinfo(xp, audit_buf);
2778 audit_log_end(audit_buf);
2779 }
2780 EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
2781 #endif
2782
2783 #ifdef CONFIG_XFRM_MIGRATE
2784 static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp,
2785 const struct xfrm_selector *sel_tgt)
2786 {
2787 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
2788 if (sel_tgt->family == sel_cmp->family &&
2789 xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr,
2790 sel_cmp->family) == 0 &&
2791 xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr,
2792 sel_cmp->family) == 0 &&
2793 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
2794 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
2795 return true;
2796 }
2797 } else {
2798 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
2799 return true;
2800 }
2801 }
2802 return false;
2803 }
2804
2805 static struct xfrm_policy * xfrm_migrate_policy_find(const struct xfrm_selector *sel,
2806 u8 dir, u8 type)
2807 {
2808 struct xfrm_policy *pol, *ret = NULL;
2809 struct hlist_node *entry;
2810 struct hlist_head *chain;
2811 u32 priority = ~0U;
2812
2813 read_lock_bh(&xfrm_policy_lock);
2814 chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir);
2815 hlist_for_each_entry(pol, entry, chain, bydst) {
2816 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2817 pol->type == type) {
2818 ret = pol;
2819 priority = ret->priority;
2820 break;
2821 }
2822 }
2823 chain = &init_net.xfrm.policy_inexact[dir];
2824 hlist_for_each_entry(pol, entry, chain, bydst) {
2825 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2826 pol->type == type &&
2827 pol->priority < priority) {
2828 ret = pol;
2829 break;
2830 }
2831 }
2832
2833 if (ret)
2834 xfrm_pol_hold(ret);
2835
2836 read_unlock_bh(&xfrm_policy_lock);
2837
2838 return ret;
2839 }
2840
2841 static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t)
2842 {
2843 int match = 0;
2844
2845 if (t->mode == m->mode && t->id.proto == m->proto &&
2846 (m->reqid == 0 || t->reqid == m->reqid)) {
2847 switch (t->mode) {
2848 case XFRM_MODE_TUNNEL:
2849 case XFRM_MODE_BEET:
2850 if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr,
2851 m->old_family) == 0 &&
2852 xfrm_addr_cmp(&t->saddr, &m->old_saddr,
2853 m->old_family) == 0) {
2854 match = 1;
2855 }
2856 break;
2857 case XFRM_MODE_TRANSPORT:
2858 /* in case of transport mode, template does not store
2859 any IP addresses, hence we just compare mode and
2860 protocol */
2861 match = 1;
2862 break;
2863 default:
2864 break;
2865 }
2866 }
2867 return match;
2868 }
2869
2870 /* update endpoint address(es) of template(s) */
2871 static int xfrm_policy_migrate(struct xfrm_policy *pol,
2872 struct xfrm_migrate *m, int num_migrate)
2873 {
2874 struct xfrm_migrate *mp;
2875 int i, j, n = 0;
2876
2877 write_lock_bh(&pol->lock);
2878 if (unlikely(pol->walk.dead)) {
2879 /* target policy has been deleted */
2880 write_unlock_bh(&pol->lock);
2881 return -ENOENT;
2882 }
2883
2884 for (i = 0; i < pol->xfrm_nr; i++) {
2885 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
2886 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
2887 continue;
2888 n++;
2889 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
2890 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
2891 continue;
2892 /* update endpoints */
2893 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
2894 sizeof(pol->xfrm_vec[i].id.daddr));
2895 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
2896 sizeof(pol->xfrm_vec[i].saddr));
2897 pol->xfrm_vec[i].encap_family = mp->new_family;
2898 /* flush bundles */
2899 atomic_inc(&pol->genid);
2900 }
2901 }
2902
2903 write_unlock_bh(&pol->lock);
2904
2905 if (!n)
2906 return -ENODATA;
2907
2908 return 0;
2909 }
2910
2911 static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate)
2912 {
2913 int i, j;
2914
2915 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
2916 return -EINVAL;
2917
2918 for (i = 0; i < num_migrate; i++) {
2919 if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr,
2920 m[i].old_family) == 0) &&
2921 (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr,
2922 m[i].old_family) == 0))
2923 return -EINVAL;
2924 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
2925 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
2926 return -EINVAL;
2927
2928 /* check if there is any duplicated entry */
2929 for (j = i + 1; j < num_migrate; j++) {
2930 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
2931 sizeof(m[i].old_daddr)) &&
2932 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
2933 sizeof(m[i].old_saddr)) &&
2934 m[i].proto == m[j].proto &&
2935 m[i].mode == m[j].mode &&
2936 m[i].reqid == m[j].reqid &&
2937 m[i].old_family == m[j].old_family)
2938 return -EINVAL;
2939 }
2940 }
2941
2942 return 0;
2943 }
2944
2945 int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2946 struct xfrm_migrate *m, int num_migrate,
2947 struct xfrm_kmaddress *k)
2948 {
2949 int i, err, nx_cur = 0, nx_new = 0;
2950 struct xfrm_policy *pol = NULL;
2951 struct xfrm_state *x, *xc;
2952 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
2953 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
2954 struct xfrm_migrate *mp;
2955
2956 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
2957 goto out;
2958
2959 /* Stage 1 - find policy */
2960 if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) {
2961 err = -ENOENT;
2962 goto out;
2963 }
2964
2965 /* Stage 2 - find and update state(s) */
2966 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
2967 if ((x = xfrm_migrate_state_find(mp))) {
2968 x_cur[nx_cur] = x;
2969 nx_cur++;
2970 if ((xc = xfrm_state_migrate(x, mp))) {
2971 x_new[nx_new] = xc;
2972 nx_new++;
2973 } else {
2974 err = -ENODATA;
2975 goto restore_state;
2976 }
2977 }
2978 }
2979
2980 /* Stage 3 - update policy */
2981 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
2982 goto restore_state;
2983
2984 /* Stage 4 - delete old state(s) */
2985 if (nx_cur) {
2986 xfrm_states_put(x_cur, nx_cur);
2987 xfrm_states_delete(x_cur, nx_cur);
2988 }
2989
2990 /* Stage 5 - announce */
2991 km_migrate(sel, dir, type, m, num_migrate, k);
2992
2993 xfrm_pol_put(pol);
2994
2995 return 0;
2996 out:
2997 return err;
2998
2999 restore_state:
3000 if (pol)
3001 xfrm_pol_put(pol);
3002 if (nx_cur)
3003 xfrm_states_put(x_cur, nx_cur);
3004 if (nx_new)
3005 xfrm_states_delete(x_new, nx_new);
3006
3007 return err;
3008 }
3009 EXPORT_SYMBOL(xfrm_migrate);
3010 #endif
kernel source for telekom puls (alcatel/mediatek)