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Merge tag 'at91-ab-4.13-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/abellon...
[mirror_ubuntu-bionic-kernel.git] / net / xfrm / xfrm_policy.c
CommitLineData
a716c119 1/*
1da177e4
LT		 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
df71837d 13 *
1da177e4
LT		 14 */
15
66cdb3ca 16#include <linux/err.h>
1da177e4
LT		 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>
eb9c7ebe 24#include <linux/netfilter.h>
1da177e4 25#include <linux/module.h>
2518c7c2 26#include <linux/cache.h>
68277acc 27#include <linux/audit.h>
25ee3286 28#include <net/dst.h>
6ce74ec7 29#include <net/flow.h>
1da177e4
LT		 30#include <net/xfrm.h>
31#include <net/ip.h>
558f82ef
MN		 32#ifdef CONFIG_XFRM_STATISTICS
33#include <net/snmp.h>
34#endif
1da177e4 35
44e36b42
DM		 36#include "xfrm_hash.h"
37
a0073fe1
SK		 38#define XFRM_QUEUE_TMO_MIN ((unsigned)(HZ/10))
39#define XFRM_QUEUE_TMO_MAX ((unsigned)(60*HZ))
40#define XFRM_MAX_QUEUE_LEN 100
41
b8c203b2
SK		 42struct xfrm_flo {
43 struct dst_entry *dst_orig;
44 u8 flags;
45};
46
418a99ac 47static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock);
37b10383 48static struct xfrm_policy_afinfo const __rcu *xfrm_policy_afinfo[AF_INET6 + 1]
418a99ac 49 __read_mostly;
1da177e4 50
e18b890b 51static struct kmem_cache *xfrm_dst_cache __read_mostly;
30846090 52static __read_mostly seqcount_t xfrm_policy_hash_generation;
1da177e4 53
25ee3286 54static void xfrm_init_pmtu(struct dst_entry *dst);
80c802f3 55static int stale_bundle(struct dst_entry *dst);
12fdb4d3 56static int xfrm_bundle_ok(struct xfrm_dst *xdst);
a0073fe1 57static void xfrm_policy_queue_process(unsigned long arg);
1da177e4 58
12bfa8bd 59static void __xfrm_policy_link(struct xfrm_policy *pol, int dir);
29fa0b30
WY		 60static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
61 int dir);
62
e37cc8ad
FW		 63static inline bool xfrm_pol_hold_rcu(struct xfrm_policy *policy)
64{
65 return atomic_inc_not_zero(&policy->refcnt);
66}
67
bc9b35ad 68static inline bool
200ce96e 69__xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
77681021 70{
7e1dc7b6
DM		 71 const struct flowi4 *fl4 = &fl->u.ip4;
72
26bff940
AD		 73 return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) &&
74 addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) &&
7e1dc7b6
DM		 75 !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) &&
76 !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) &&
77 (fl4->flowi4_proto == sel->proto || !sel->proto) &&
78 (fl4->flowi4_oif == sel->ifindex || !sel->ifindex);
77681021
AM		 79}
80
bc9b35ad 81static inline bool
200ce96e 82__xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
77681021 83{
7e1dc7b6
DM		 84 const struct flowi6 *fl6 = &fl->u.ip6;
85
86 return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) &&
87 addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) &&
88 !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) &&
89 !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) &&
90 (fl6->flowi6_proto == sel->proto || !sel->proto) &&
91 (fl6->flowi6_oif == sel->ifindex || !sel->ifindex);
77681021
AM		 92}
93
bc9b35ad
DM		 94bool xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl,
95 unsigned short family)
77681021
AM		 96{
97 switch (family) {
98 case AF_INET:
99 return __xfrm4_selector_match(sel, fl);
100 case AF_INET6:
101 return __xfrm6_selector_match(sel, fl);
102 }
bc9b35ad 103 return false;
77681021
AM		 104}
105
a2817d8b 106static const struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
ef8531b6 107{
a2817d8b 108 const struct xfrm_policy_afinfo *afinfo;
ef8531b6 109
a2817d8b 110 if (unlikely(family >= ARRAY_SIZE(xfrm_policy_afinfo)))
ef8531b6
ED		 111 return NULL;
112 rcu_read_lock();
113 afinfo = rcu_dereference(xfrm_policy_afinfo[family]);
114 if (unlikely(!afinfo))
115 rcu_read_unlock();
116 return afinfo;
117}
118
d77e38e6
SK		 119struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
120 const xfrm_address_t *saddr,
121 const xfrm_address_t *daddr,
122 int family)
9bb182a7 123{
37b10383 124 const struct xfrm_policy_afinfo *afinfo;
9bb182a7
YH		 125 struct dst_entry *dst;
126
127 afinfo = xfrm_policy_get_afinfo(family);
128 if (unlikely(afinfo == NULL))
129 return ERR_PTR(-EAFNOSUPPORT);
130
42a7b32b 131 dst = afinfo->dst_lookup(net, tos, oif, saddr, daddr);
9bb182a7 132
bdba9fe0 133 rcu_read_unlock();
9bb182a7
YH		 134
135 return dst;
136}
d77e38e6 137EXPORT_SYMBOL(__xfrm_dst_lookup);
9bb182a7 138
42a7b32b
DA		 139static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x,
140 int tos, int oif,
9bb182a7
YH		 141 xfrm_address_t *prev_saddr,
142 xfrm_address_t *prev_daddr,
25ee3286 143 int family)
1da177e4 144{
c5b3cf46 145 struct net *net = xs_net(x);
66cdb3ca
HX		 146 xfrm_address_t *saddr = &x->props.saddr;
147 xfrm_address_t *daddr = &x->id.daddr;
66cdb3ca
HX		 148 struct dst_entry *dst;
149
9bb182a7 150 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
66cdb3ca 151 saddr = x->coaddr;
9bb182a7
YH		 152 daddr = prev_daddr;
153 }
154 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
155 saddr = prev_saddr;
66cdb3ca 156 daddr = x->coaddr;
9bb182a7 157 }
1da177e4 158
42a7b32b 159 dst = __xfrm_dst_lookup(net, tos, oif, saddr, daddr, family);
9bb182a7
YH		 160
161 if (!IS_ERR(dst)) {
162 if (prev_saddr != saddr)
163 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
164 if (prev_daddr != daddr)
165 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
166 }
1da177e4 167
66cdb3ca 168 return dst;
1da177e4 169}
1da177e4 170
1da177e4
LT		 171static inline unsigned long make_jiffies(long secs)
172{
173 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
174 return MAX_SCHEDULE_TIMEOUT-1;
175 else
a716c119 176 return secs*HZ;
1da177e4
LT		 177}
178
179static void xfrm_policy_timer(unsigned long data)
180{
3e94c2dc 181 struct xfrm_policy *xp = (struct xfrm_policy *)data;
9d729f72 182 unsigned long now = get_seconds();
1da177e4
LT		 183 long next = LONG_MAX;
184 int warn = 0;
185 int dir;
186
187 read_lock(&xp->lock);
188
ea2dea9d 189 if (unlikely(xp->walk.dead))
1da177e4
LT		 190 goto out;
191
77d8d7a6 192 dir = xfrm_policy_id2dir(xp->index);
1da177e4
LT		 193
194 if (xp->lft.hard_add_expires_seconds) {
195 long tmo = xp->lft.hard_add_expires_seconds +
196 xp->curlft.add_time - now;
197 if (tmo <= 0)
198 goto expired;
199 if (tmo < next)
200 next = tmo;
201 }
202 if (xp->lft.hard_use_expires_seconds) {
203 long tmo = xp->lft.hard_use_expires_seconds +
204 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
205 if (tmo <= 0)
206 goto expired;
207 if (tmo < next)
208 next = tmo;
209 }
210 if (xp->lft.soft_add_expires_seconds) {
211 long tmo = xp->lft.soft_add_expires_seconds +
212 xp->curlft.add_time - now;
213 if (tmo <= 0) {
214 warn = 1;
215 tmo = XFRM_KM_TIMEOUT;
216 }
217 if (tmo < next)
218 next = tmo;
219 }
220 if (xp->lft.soft_use_expires_seconds) {
221 long tmo = xp->lft.soft_use_expires_seconds +
222 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
223 if (tmo <= 0) {
224 warn = 1;
225 tmo = XFRM_KM_TIMEOUT;
226 }
227 if (tmo < next)
228 next = tmo;
229 }
230
231 if (warn)
6c5c8ca7 232 km_policy_expired(xp, dir, 0, 0);
1da177e4
LT		 233 if (next != LONG_MAX &&
234 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
235 xfrm_pol_hold(xp);
236
237out:
238 read_unlock(&xp->lock);
239 xfrm_pol_put(xp);
240 return;
241
242expired:
243 read_unlock(&xp->lock);
4666faab 244 if (!xfrm_policy_delete(xp, dir))
6c5c8ca7 245 km_policy_expired(xp, dir, 1, 0);
1da177e4
LT		 246 xfrm_pol_put(xp);
247}
248
fe1a5f03
TT		 249static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo)
250{
251 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
252
253 if (unlikely(pol->walk.dead))
254 flo = NULL;
255 else
256 xfrm_pol_hold(pol);
257
258 return flo;
259}
260
261static int xfrm_policy_flo_check(struct flow_cache_object *flo)
262{
263 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
264
265 return !pol->walk.dead;
266}
267
268static void xfrm_policy_flo_delete(struct flow_cache_object *flo)
269{
270 xfrm_pol_put(container_of(flo, struct xfrm_policy, flo));
271}
272
273static const struct flow_cache_ops xfrm_policy_fc_ops = {
274 .get = xfrm_policy_flo_get,
275 .check = xfrm_policy_flo_check,
276 .delete = xfrm_policy_flo_delete,
277};
1da177e4
LT		 278
279/* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
280 * SPD calls.
281 */
282
0331b1f3 283struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
1da177e4
LT		 284{
285 struct xfrm_policy *policy;
286
0da974f4 287 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
1da177e4
LT		 288
289 if (policy) {
0331b1f3 290 write_pnet(&policy->xp_net, net);
12a169e7 291 INIT_LIST_HEAD(&policy->walk.all);
2518c7c2
DM		 292 INIT_HLIST_NODE(&policy->bydst);
293 INIT_HLIST_NODE(&policy->byidx);
1da177e4 294 rwlock_init(&policy->lock);
2518c7c2 295 atomic_set(&policy->refcnt, 1);
a0073fe1 296 skb_queue_head_init(&policy->polq.hold_queue);
b24b8a24
PE		 297 setup_timer(&policy->timer, xfrm_policy_timer,
298 (unsigned long)policy);
a0073fe1
SK		 299 setup_timer(&policy->polq.hold_timer, xfrm_policy_queue_process,
300 (unsigned long)policy);
fe1a5f03 301 policy->flo.ops = &xfrm_policy_fc_ops;
1da177e4
LT		 302 }
303 return policy;
304}
305EXPORT_SYMBOL(xfrm_policy_alloc);
306
56f04730
ED		 307static void xfrm_policy_destroy_rcu(struct rcu_head *head)
308{
309 struct xfrm_policy *policy = container_of(head, struct xfrm_policy, rcu);
310
311 security_xfrm_policy_free(policy->security);
312 kfree(policy);
313}
314
1da177e4
LT		 315/* Destroy xfrm_policy: descendant resources must be released to this moment. */
316
64c31b3f 317void xfrm_policy_destroy(struct xfrm_policy *policy)
1da177e4 318{
12a169e7 319 BUG_ON(!policy->walk.dead);
1da177e4 320
0659eea9 321 if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer))
1da177e4
LT		 322 BUG();
323
56f04730 324 call_rcu(&policy->rcu, xfrm_policy_destroy_rcu);
1da177e4 325}
64c31b3f 326EXPORT_SYMBOL(xfrm_policy_destroy);
1da177e4 327
1365e547 328/* Rule must be locked. Release descendant resources, announce
1da177e4
LT		 329 * entry dead. The rule must be unlinked from lists to the moment.
330 */
331
332static void xfrm_policy_kill(struct xfrm_policy *policy)
333{
12a169e7 334 policy->walk.dead = 1;
1da177e4 335
285ead17 336 atomic_inc(&policy->genid);
1da177e4 337
e7d8f6cb
SK		 338 if (del_timer(&policy->polq.hold_timer))
339 xfrm_pol_put(policy);
1ee5e667 340 skb_queue_purge(&policy->polq.hold_queue);
a0073fe1 341
285ead17
TT		 342 if (del_timer(&policy->timer))
343 xfrm_pol_put(policy);
344
345 xfrm_pol_put(policy);
1da177e4
LT		 346}
347
2518c7c2
DM		 348static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
349
e92303f8 350static inline unsigned int idx_hash(struct net *net, u32 index)
2518c7c2 351{
e92303f8 352 return __idx_hash(index, net->xfrm.policy_idx_hmask);
2518c7c2
DM		 353}
354
b58555f1
CG		 355/* calculate policy hash thresholds */
356static void __get_hash_thresh(struct net *net,
357 unsigned short family, int dir,
358 u8 *dbits, u8 *sbits)
359{
360 switch (family) {
361 case AF_INET:
362 *dbits = net->xfrm.policy_bydst[dir].dbits4;
363 *sbits = net->xfrm.policy_bydst[dir].sbits4;
364 break;
365
366 case AF_INET6:
367 *dbits = net->xfrm.policy_bydst[dir].dbits6;
368 *sbits = net->xfrm.policy_bydst[dir].sbits6;
369 break;
370
371 default:
372 *dbits = 0;
373 *sbits = 0;
374 }
375}
376
5f803b58
DM		 377static struct hlist_head *policy_hash_bysel(struct net *net,
378 const struct xfrm_selector *sel,
379 unsigned short family, int dir)
2518c7c2 380{
1121994c 381 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
b58555f1
CG		 382 unsigned int hash;
383 u8 dbits;
384 u8 sbits;
385
386 __get_hash_thresh(net, family, dir, &dbits, &sbits);
387 hash = __sel_hash(sel, family, hmask, dbits, sbits);
2518c7c2 388
e1e551bc
FW		 389 if (hash == hmask + 1)
390 return &net->xfrm.policy_inexact[dir];
391
392 return rcu_dereference_check(net->xfrm.policy_bydst[dir].table,
393 lockdep_is_held(&net->xfrm.xfrm_policy_lock)) + hash;
2518c7c2
DM		 394}
395
5f803b58
DM		 396static struct hlist_head *policy_hash_direct(struct net *net,
397 const xfrm_address_t *daddr,
398 const xfrm_address_t *saddr,
399 unsigned short family, int dir)
2518c7c2 400{
1121994c 401 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
b58555f1
CG		 402 unsigned int hash;
403 u8 dbits;
404 u8 sbits;
405
406 __get_hash_thresh(net, family, dir, &dbits, &sbits);
407 hash = __addr_hash(daddr, saddr, family, hmask, dbits, sbits);
2518c7c2 408
e1e551bc
FW		 409 return rcu_dereference_check(net->xfrm.policy_bydst[dir].table,
410 lockdep_is_held(&net->xfrm.xfrm_policy_lock)) + hash;
2518c7c2
DM		 411}
412
b58555f1
CG		 413static void xfrm_dst_hash_transfer(struct net *net,
414 struct hlist_head *list,
2518c7c2 415 struct hlist_head *ndsttable,
b58555f1
CG		 416 unsigned int nhashmask,
417 int dir)
2518c7c2 418{
b67bfe0d 419 struct hlist_node *tmp, *entry0 = NULL;
2518c7c2 420 struct xfrm_policy *pol;
b791160b 421 unsigned int h0 = 0;
b58555f1
CG		 422 u8 dbits;
423 u8 sbits;
2518c7c2 424
b791160b 425redo:
b67bfe0d 426 hlist_for_each_entry_safe(pol, tmp, list, bydst) {
2518c7c2
DM		 427 unsigned int h;
428
b58555f1 429 __get_hash_thresh(net, pol->family, dir, &dbits, &sbits);
2518c7c2 430 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
b58555f1 431 pol->family, nhashmask, dbits, sbits);
b791160b 432 if (!entry0) {
a5eefc1d
FW		 433 hlist_del_rcu(&pol->bydst);
434 hlist_add_head_rcu(&pol->bydst, ndsttable + h);
b791160b
YH		 435 h0 = h;
436 } else {
437 if (h != h0)
438 continue;
a5eefc1d
FW		 439 hlist_del_rcu(&pol->bydst);
440 hlist_add_behind_rcu(&pol->bydst, entry0);
b791160b 441 }
b67bfe0d 442 entry0 = &pol->bydst;
b791160b
YH		 443 }
444 if (!hlist_empty(list)) {
445 entry0 = NULL;
446 goto redo;
2518c7c2
DM		 447 }
448}
449
450static void xfrm_idx_hash_transfer(struct hlist_head *list,
451 struct hlist_head *nidxtable,
452 unsigned int nhashmask)
453{
b67bfe0d 454 struct hlist_node *tmp;
2518c7c2
DM		 455 struct xfrm_policy *pol;
456
b67bfe0d 457 hlist_for_each_entry_safe(pol, tmp, list, byidx) {
2518c7c2
DM		 458 unsigned int h;
459
460 h = __idx_hash(pol->index, nhashmask);
461 hlist_add_head(&pol->byidx, nidxtable+h);
462 }
463}
464
465static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
466{
467 return ((old_hmask + 1) << 1) - 1;
468}
469
66caf628 470static void xfrm_bydst_resize(struct net *net, int dir)
2518c7c2 471{
66caf628 472 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
2518c7c2
DM		 473 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
474 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
44e36b42 475 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
e1e551bc 476 struct hlist_head *odst;
2518c7c2
DM		 477 int i;
478
479 if (!ndst)
480 return;
481
9d0380df 482 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
30846090
FW		 483 write_seqcount_begin(&xfrm_policy_hash_generation);
484
485 odst = rcu_dereference_protected(net->xfrm.policy_bydst[dir].table,
486 lockdep_is_held(&net->xfrm.xfrm_policy_lock));
2518c7c2 487
e1e551bc
FW		 488 odst = rcu_dereference_protected(net->xfrm.policy_bydst[dir].table,
489 lockdep_is_held(&net->xfrm.xfrm_policy_lock));
490
2518c7c2 491 for (i = hmask; i >= 0; i--)
b58555f1 492 xfrm_dst_hash_transfer(net, odst + i, ndst, nhashmask, dir);
2518c7c2 493
e1e551bc 494 rcu_assign_pointer(net->xfrm.policy_bydst[dir].table, ndst);
66caf628 495 net->xfrm.policy_bydst[dir].hmask = nhashmask;
2518c7c2 496
30846090 497 write_seqcount_end(&xfrm_policy_hash_generation);
9d0380df 498 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2 499
e1e551bc
FW		 500 synchronize_rcu();
501
44e36b42 502 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
2518c7c2
DM		 503}
504
66caf628 505static void xfrm_byidx_resize(struct net *net, int total)
2518c7c2 506{
66caf628 507 unsigned int hmask = net->xfrm.policy_idx_hmask;
2518c7c2
DM		 508 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
509 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
66caf628 510 struct hlist_head *oidx = net->xfrm.policy_byidx;
44e36b42 511 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
2518c7c2
DM		 512 int i;
513
514 if (!nidx)
515 return;
516
9d0380df 517 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2
DM		 518
519 for (i = hmask; i >= 0; i--)
520 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
521
66caf628
AD		 522 net->xfrm.policy_byidx = nidx;
523 net->xfrm.policy_idx_hmask = nhashmask;
2518c7c2 524
9d0380df 525 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2 526
44e36b42 527 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
2518c7c2
DM		 528}
529
66caf628 530static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
2518c7c2 531{
66caf628
AD		 532 unsigned int cnt = net->xfrm.policy_count[dir];
533 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
2518c7c2
DM		 534
535 if (total)
536 *total += cnt;
537
538 if ((hmask + 1) < xfrm_policy_hashmax &&
539 cnt > hmask)
540 return 1;
541
542 return 0;
543}
544
66caf628 545static inline int xfrm_byidx_should_resize(struct net *net, int total)
2518c7c2 546{
66caf628 547 unsigned int hmask = net->xfrm.policy_idx_hmask;
2518c7c2
DM		 548
549 if ((hmask + 1) < xfrm_policy_hashmax &&
550 total > hmask)
551 return 1;
552
553 return 0;
554}
555
e071041b 556void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si)
ecfd6b18 557{
e071041b
AD		 558 si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN];
559 si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT];
560 si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD];
561 si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
562 si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
563 si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
564 si->spdhcnt = net->xfrm.policy_idx_hmask;
ecfd6b18 565 si->spdhmcnt = xfrm_policy_hashmax;
ecfd6b18
JHS		 566}
567EXPORT_SYMBOL(xfrm_spd_getinfo);
2518c7c2 568
ecfd6b18 569static DEFINE_MUTEX(hash_resize_mutex);
66caf628 570static void xfrm_hash_resize(struct work_struct *work)
2518c7c2 571{
66caf628 572 struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
2518c7c2
DM		 573 int dir, total;
574
575 mutex_lock(&hash_resize_mutex);
576
577 total = 0;
53c2e285 578 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
66caf628
AD		 579 if (xfrm_bydst_should_resize(net, dir, &total))
580 xfrm_bydst_resize(net, dir);
2518c7c2 581 }
66caf628
AD		 582 if (xfrm_byidx_should_resize(net, total))
583 xfrm_byidx_resize(net, total);
2518c7c2
DM		 584
585 mutex_unlock(&hash_resize_mutex);
586}
587
880a6fab
CG		 588static void xfrm_hash_rebuild(struct work_struct *work)
589{
590 struct net *net = container_of(work, struct net,
591 xfrm.policy_hthresh.work);
592 unsigned int hmask;
593 struct xfrm_policy *pol;
594 struct xfrm_policy *policy;
595 struct hlist_head *chain;
596 struct hlist_head *odst;
597 struct hlist_node *newpos;
598 int i;
599 int dir;
600 unsigned seq;
601 u8 lbits4, rbits4, lbits6, rbits6;
602
603 mutex_lock(&hash_resize_mutex);
604
605 /* read selector prefixlen thresholds */
606 do {
607 seq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
608
609 lbits4 = net->xfrm.policy_hthresh.lbits4;
610 rbits4 = net->xfrm.policy_hthresh.rbits4;
611 lbits6 = net->xfrm.policy_hthresh.lbits6;
612 rbits6 = net->xfrm.policy_hthresh.rbits6;
613 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, seq));
614
9d0380df 615 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
880a6fab
CG		 616
617 /* reset the bydst and inexact table in all directions */
53c2e285 618 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
880a6fab
CG		 619 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
620 hmask = net->xfrm.policy_bydst[dir].hmask;
621 odst = net->xfrm.policy_bydst[dir].table;
622 for (i = hmask; i >= 0; i--)
623 INIT_HLIST_HEAD(odst + i);
624 if ((dir & XFRM_POLICY_MASK) == XFRM_POLICY_OUT) {
625 /* dir out => dst = remote, src = local */
626 net->xfrm.policy_bydst[dir].dbits4 = rbits4;
627 net->xfrm.policy_bydst[dir].sbits4 = lbits4;
628 net->xfrm.policy_bydst[dir].dbits6 = rbits6;
629 net->xfrm.policy_bydst[dir].sbits6 = lbits6;
630 } else {
631 /* dir in/fwd => dst = local, src = remote */
632 net->xfrm.policy_bydst[dir].dbits4 = lbits4;
633 net->xfrm.policy_bydst[dir].sbits4 = rbits4;
634 net->xfrm.policy_bydst[dir].dbits6 = lbits6;
635 net->xfrm.policy_bydst[dir].sbits6 = rbits6;
636 }
637 }
638
639 /* re-insert all policies by order of creation */
640 list_for_each_entry_reverse(policy, &net->xfrm.policy_all, walk.all) {
6916fb3b
TB		 641 if (xfrm_policy_id2dir(policy->index) >= XFRM_POLICY_MAX) {
642 /* skip socket policies */
643 continue;
644 }
880a6fab
CG		 645 newpos = NULL;
646 chain = policy_hash_bysel(net, &policy->selector,
647 policy->family,
648 xfrm_policy_id2dir(policy->index));
649 hlist_for_each_entry(pol, chain, bydst) {
650 if (policy->priority >= pol->priority)
651 newpos = &pol->bydst;
652 else
653 break;
654 }
655 if (newpos)
656 hlist_add_behind(&policy->bydst, newpos);
657 else
658 hlist_add_head(&policy->bydst, chain);
659 }
660
9d0380df 661 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
880a6fab
CG		 662
663 mutex_unlock(&hash_resize_mutex);
664}
665
666void xfrm_policy_hash_rebuild(struct net *net)
667{
668 schedule_work(&net->xfrm.policy_hthresh.work);
669}
670EXPORT_SYMBOL(xfrm_policy_hash_rebuild);
671
1da177e4
LT		 672/* Generate new index... KAME seems to generate them ordered by cost
673 * of an absolute inpredictability of ordering of rules. This will not pass. */
e682adf0 674static u32 xfrm_gen_index(struct net *net, int dir, u32 index)
1da177e4 675{
1da177e4
LT		 676 static u32 idx_generator;
677
678 for (;;) {
2518c7c2
DM		 679 struct hlist_head *list;
680 struct xfrm_policy *p;
681 u32 idx;
682 int found;
683
e682adf0
FD		 684 if (!index) {
685 idx = (idx_generator | dir);
686 idx_generator += 8;
687 } else {
688 idx = index;
689 index = 0;
690 }
691
1da177e4
LT		 692 if (idx == 0)
693 idx = 8;
1121994c 694 list = net->xfrm.policy_byidx + idx_hash(net, idx);
2518c7c2 695 found = 0;
b67bfe0d 696 hlist_for_each_entry(p, list, byidx) {
2518c7c2
DM		 697 if (p->index == idx) {
698 found = 1;
1da177e4 699 break;
2518c7c2 700 }
1da177e4 701 }
2518c7c2 702 if (!found)
1da177e4
LT		 703 return idx;
704 }
705}
706
2518c7c2
DM		 707static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
708{
709 u32 *p1 = (u32 *) s1;
710 u32 *p2 = (u32 *) s2;
711 int len = sizeof(struct xfrm_selector) / sizeof(u32);
712 int i;
713
714 for (i = 0; i < len; i++) {
715 if (p1[i] != p2[i])
716 return 1;
717 }
718
719 return 0;
720}
721
a0073fe1
SK		 722static void xfrm_policy_requeue(struct xfrm_policy *old,
723 struct xfrm_policy *new)
724{
725 struct xfrm_policy_queue *pq = &old->polq;
726 struct sk_buff_head list;
727
de2ad486
LR		 728 if (skb_queue_empty(&pq->hold_queue))
729 return;
730
a0073fe1
SK		 731 __skb_queue_head_init(&list);
732
733 spin_lock_bh(&pq->hold_queue.lock);
734 skb_queue_splice_init(&pq->hold_queue, &list);
e7d8f6cb
SK		 735 if (del_timer(&pq->hold_timer))
736 xfrm_pol_put(old);
a0073fe1
SK		 737 spin_unlock_bh(&pq->hold_queue.lock);
738
a0073fe1
SK		 739 pq = &new->polq;
740
741 spin_lock_bh(&pq->hold_queue.lock);
742 skb_queue_splice(&list, &pq->hold_queue);
743 pq->timeout = XFRM_QUEUE_TMO_MIN;
e7d8f6cb
SK		 744 if (!mod_timer(&pq->hold_timer, jiffies))
745 xfrm_pol_hold(new);
a0073fe1
SK		 746 spin_unlock_bh(&pq->hold_queue.lock);
747}
748
7cb8a939
SK		 749static bool xfrm_policy_mark_match(struct xfrm_policy *policy,
750 struct xfrm_policy *pol)
751{
752 u32 mark = policy->mark.v & policy->mark.m;
753
754 if (policy->mark.v == pol->mark.v && policy->mark.m == pol->mark.m)
755 return true;
756
757 if ((mark & pol->mark.m) == pol->mark.v &&
758 policy->priority == pol->priority)
759 return true;
760
761 return false;
762}
763
1da177e4
LT		 764int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
765{
1121994c 766 struct net *net = xp_net(policy);
2518c7c2
DM		 767 struct xfrm_policy *pol;
768 struct xfrm_policy *delpol;
769 struct hlist_head *chain;
b67bfe0d 770 struct hlist_node *newpos;
1da177e4 771
9d0380df 772 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
1121994c 773 chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
2518c7c2
DM		 774 delpol = NULL;
775 newpos = NULL;
b67bfe0d 776 hlist_for_each_entry(pol, chain, bydst) {
a6c7ab55 777 if (pol->type == policy->type &&
2518c7c2 778 !selector_cmp(&pol->selector, &policy->selector) &&
7cb8a939 779 xfrm_policy_mark_match(policy, pol) &&
a6c7ab55
HX		 780 xfrm_sec_ctx_match(pol->security, policy->security) &&
781 !WARN_ON(delpol)) {
1da177e4 782 if (excl) {
9d0380df 783 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 784 return -EEXIST;
785 }
1da177e4
LT		 786 delpol = pol;
787 if (policy->priority > pol->priority)
788 continue;
789 } else if (policy->priority >= pol->priority) {
a6c7ab55 790 newpos = &pol->bydst;
1da177e4
LT		 791 continue;
792 }
1da177e4
LT		 793 if (delpol)
794 break;
1da177e4
LT		 795 }
796 if (newpos)
1d023284 797 hlist_add_behind(&policy->bydst, newpos);
2518c7c2
DM		 798 else
799 hlist_add_head(&policy->bydst, chain);
12bfa8bd 800 __xfrm_policy_link(policy, dir);
ca925cf1 801 atomic_inc(&net->xfrm.flow_cache_genid);
ca4c3fc2 802
803 /* After previous checking, family can either be AF_INET or AF_INET6 */
804 if (policy->family == AF_INET)
805 rt_genid_bump_ipv4(net);
806 else
807 rt_genid_bump_ipv6(net);
808
a0073fe1
SK		 809 if (delpol) {
810 xfrm_policy_requeue(delpol, policy);
29fa0b30 811 __xfrm_policy_unlink(delpol, dir);
a0073fe1 812 }
e682adf0 813 policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir, policy->index);
1121994c 814 hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
9d729f72 815 policy->curlft.add_time = get_seconds();
1da177e4
LT		 816 policy->curlft.use_time = 0;
817 if (!mod_timer(&policy->timer, jiffies + HZ))
818 xfrm_pol_hold(policy);
9d0380df 819 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 820
9b78a82c 821 if (delpol)
1da177e4 822 xfrm_policy_kill(delpol);
1121994c
AD		 823 else if (xfrm_bydst_should_resize(net, dir, NULL))
824 schedule_work(&net->xfrm.policy_hash_work);
9b78a82c 825
1da177e4
LT		 826 return 0;
827}
828EXPORT_SYMBOL(xfrm_policy_insert);
829
8ca2e93b
JHS		 830struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
831 int dir, struct xfrm_selector *sel,
ef41aaa0
EP		 832 struct xfrm_sec_ctx *ctx, int delete,
833 int *err)
1da177e4 834{
2518c7c2
DM		 835 struct xfrm_policy *pol, *ret;
836 struct hlist_head *chain;
1da177e4 837
ef41aaa0 838 *err = 0;
9d0380df 839 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
8d1211a6 840 chain = policy_hash_bysel(net, sel, sel->family, dir);
2518c7c2 841 ret = NULL;
b67bfe0d 842 hlist_for_each_entry(pol, chain, bydst) {
2518c7c2 843 if (pol->type == type &&
34f8d884 844 (mark & pol->mark.m) == pol->mark.v &&
2518c7c2
DM		 845 !selector_cmp(sel, &pol->selector) &&
846 xfrm_sec_ctx_match(ctx, pol->security)) {
1da177e4 847 xfrm_pol_hold(pol);
2518c7c2 848 if (delete) {
03e1ad7b
PM		 849 *err = security_xfrm_policy_delete(
850 pol->security);
ef41aaa0 851 if (*err) {
9d0380df 852 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
ef41aaa0
EP		 853 return pol;
854 }
29fa0b30 855 __xfrm_policy_unlink(pol, dir);
2518c7c2
DM		 856 }
857 ret = pol;
1da177e4
LT		 858 break;
859 }
860 }
9d0380df 861 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 862
fe1a5f03 863 if (ret && delete)
2518c7c2 864 xfrm_policy_kill(ret);
2518c7c2 865 return ret;
1da177e4 866}
df71837d 867EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
1da177e4 868
8ca2e93b
JHS		 869struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
870 int dir, u32 id, int delete, int *err)
1da177e4 871{
2518c7c2
DM		 872 struct xfrm_policy *pol, *ret;
873 struct hlist_head *chain;
1da177e4 874
b5505c6e
HX		 875 *err = -ENOENT;
876 if (xfrm_policy_id2dir(id) != dir)
877 return NULL;
878
ef41aaa0 879 *err = 0;
9d0380df 880 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
8d1211a6 881 chain = net->xfrm.policy_byidx + idx_hash(net, id);
2518c7c2 882 ret = NULL;
b67bfe0d 883 hlist_for_each_entry(pol, chain, byidx) {
34f8d884
JHS		 884 if (pol->type == type && pol->index == id &&
885 (mark & pol->mark.m) == pol->mark.v) {
1da177e4 886 xfrm_pol_hold(pol);
2518c7c2 887 if (delete) {
03e1ad7b
PM		 888 *err = security_xfrm_policy_delete(
889 pol->security);
ef41aaa0 890 if (*err) {
9d0380df 891 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
ef41aaa0
EP		 892 return pol;
893 }
29fa0b30 894 __xfrm_policy_unlink(pol, dir);
2518c7c2
DM		 895 }
896 ret = pol;
1da177e4
LT		 897 break;
898 }
899 }
9d0380df 900 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 901
fe1a5f03 902 if (ret && delete)
2518c7c2 903 xfrm_policy_kill(ret);
2518c7c2 904 return ret;
1da177e4
LT		 905}
906EXPORT_SYMBOL(xfrm_policy_byid);
907
4aa2e62c
JL		 908#ifdef CONFIG_SECURITY_NETWORK_XFRM
909static inline int
2e71029e 910xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid)
1da177e4 911{
4aa2e62c
JL		 912 int dir, err = 0;
913
914 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
915 struct xfrm_policy *pol;
4aa2e62c
JL		 916 int i;
917
b67bfe0d 918 hlist_for_each_entry(pol,
33ffbbd5 919 &net->xfrm.policy_inexact[dir], bydst) {
4aa2e62c
JL		 920 if (pol->type != type)
921 continue;
03e1ad7b 922 err = security_xfrm_policy_delete(pol->security);
4aa2e62c 923 if (err) {
2e71029e 924 xfrm_audit_policy_delete(pol, 0, task_valid);
4aa2e62c
JL		 925 return err;
926 }
7dc12d6d 927 }
33ffbbd5 928 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
b67bfe0d 929 hlist_for_each_entry(pol,
33ffbbd5 930 net->xfrm.policy_bydst[dir].table + i,
4aa2e62c
JL		 931 bydst) {
932 if (pol->type != type)
933 continue;
03e1ad7b
PM		 934 err = security_xfrm_policy_delete(
935 pol->security);
4aa2e62c 936 if (err) {
ab5f5e8b 937 xfrm_audit_policy_delete(pol, 0,
2e71029e 938 task_valid);
4aa2e62c
JL		 939 return err;
940 }
941 }
942 }
943 }
944 return err;
945}
946#else
947static inline int
2e71029e 948xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid)
4aa2e62c
JL		 949{
950 return 0;
951}
952#endif
953
2e71029e 954int xfrm_policy_flush(struct net *net, u8 type, bool task_valid)
4aa2e62c 955{
2f1eb65f 956 int dir, err = 0, cnt = 0;
1da177e4 957
9d0380df 958 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
4aa2e62c 959
2e71029e 960 err = xfrm_policy_flush_secctx_check(net, type, task_valid);
4aa2e62c
JL		 961 if (err)
962 goto out;
963
1da177e4 964 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
2518c7c2 965 struct xfrm_policy *pol;
29fa0b30 966 int i;
2518c7c2
DM		 967
968 again1:
b67bfe0d 969 hlist_for_each_entry(pol,
33ffbbd5 970 &net->xfrm.policy_inexact[dir], bydst) {
2518c7c2
DM		 971 if (pol->type != type)
972 continue;
ea2dea9d 973 __xfrm_policy_unlink(pol, dir);
9d0380df 974 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
ea2dea9d 975 cnt++;
1da177e4 976
2e71029e 977 xfrm_audit_policy_delete(pol, 1, task_valid);
161a09e7 978
2518c7c2 979 xfrm_policy_kill(pol);
1da177e4 980
4141b36a 981 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2
DM		 982 goto again1;
983 }
984
33ffbbd5 985 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
2518c7c2 986 again2:
b67bfe0d 987 hlist_for_each_entry(pol,
33ffbbd5 988 net->xfrm.policy_bydst[dir].table + i,
2518c7c2
DM		 989 bydst) {
990 if (pol->type != type)
991 continue;
ea2dea9d 992 __xfrm_policy_unlink(pol, dir);
9d0380df 993 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
ea2dea9d 994 cnt++;
2518c7c2 995
2e71029e 996 xfrm_audit_policy_delete(pol, 1, task_valid);
2518c7c2
DM		 997 xfrm_policy_kill(pol);
998
9d0380df 999 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2
DM		 1000 goto again2;
1001 }
1da177e4 1002 }
2518c7c2 1003
1da177e4 1004 }
2f1eb65f
JHS		 1005 if (!cnt)
1006 err = -ESRCH;
4aa2e62c 1007out:
9d0380df 1008 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
35db0691
XL		 1009
1010 if (cnt)
1011 xfrm_garbage_collect(net);
1012
4aa2e62c 1013 return err;
1da177e4
LT		 1014}
1015EXPORT_SYMBOL(xfrm_policy_flush);
1016
cdcbca7c 1017int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
4c563f76 1018 int (*func)(struct xfrm_policy *, int, int, void*),
1da177e4
LT		 1019 void *data)
1020{
12a169e7
HX		 1021 struct xfrm_policy *pol;
1022 struct xfrm_policy_walk_entry *x;
4c563f76
TT		 1023 int error = 0;
1024
1025 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
1026 walk->type != XFRM_POLICY_TYPE_ANY)
1027 return -EINVAL;
1da177e4 1028
12a169e7 1029 if (list_empty(&walk->walk.all) && walk->seq != 0)
4c563f76
TT		 1030 return 0;
1031
9d0380df 1032 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
12a169e7 1033 if (list_empty(&walk->walk.all))
cdcbca7c 1034 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
12a169e7 1035 else
80077702
LR		 1036 x = list_first_entry(&walk->walk.all,
1037 struct xfrm_policy_walk_entry, all);
1038
cdcbca7c 1039 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
12a169e7 1040 if (x->dead)
4c563f76 1041 continue;
12a169e7
HX		 1042 pol = container_of(x, struct xfrm_policy, walk);
1043 if (walk->type != XFRM_POLICY_TYPE_ANY &&
1044 walk->type != pol->type)
1045 continue;
1046 error = func(pol, xfrm_policy_id2dir(pol->index),
1047 walk->seq, data);
1048 if (error) {
1049 list_move_tail(&walk->walk.all, &x->all);
1050 goto out;
2518c7c2 1051 }
12a169e7 1052 walk->seq++;
1da177e4 1053 }
12a169e7 1054 if (walk->seq == 0) {
baf5d743
JHS		 1055 error = -ENOENT;
1056 goto out;
1057 }
12a169e7 1058 list_del_init(&walk->walk.all);
1da177e4 1059out:
9d0380df 1060 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 1061 return error;
1062}
1063EXPORT_SYMBOL(xfrm_policy_walk);
1064
12a169e7
HX		 1065void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
1066{
1067 INIT_LIST_HEAD(&walk->walk.all);
1068 walk->walk.dead = 1;
1069 walk->type = type;
1070 walk->seq = 0;
1071}
1072EXPORT_SYMBOL(xfrm_policy_walk_init);
1073
283bc9f3 1074void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net)
12a169e7
HX		 1075{
1076 if (list_empty(&walk->walk.all))
1077 return;
1078
9d0380df 1079 spin_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME where is net? */
12a169e7 1080 list_del(&walk->walk.all);
9d0380df 1081 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
12a169e7
HX		 1082}
1083EXPORT_SYMBOL(xfrm_policy_walk_done);
1084
134b0fc5
JM		 1085/*
1086 * Find policy to apply to this flow.
1087 *
1088 * Returns 0 if policy found, else an -errno.
1089 */
f299d557
DM		 1090static int xfrm_policy_match(const struct xfrm_policy *pol,
1091 const struct flowi *fl,
2518c7c2 1092 u8 type, u16 family, int dir)
1da177e4 1093{
f299d557 1094 const struct xfrm_selector *sel = &pol->selector;
bc9b35ad
DM		 1095 int ret = -ESRCH;
1096 bool match;
1da177e4 1097
2518c7c2 1098 if (pol->family != family ||
1d28f42c 1099 (fl->flowi_mark & pol->mark.m) != pol->mark.v ||
2518c7c2 1100 pol->type != type)
134b0fc5 1101 return ret;
1da177e4 1102
2518c7c2 1103 match = xfrm_selector_match(sel, fl, family);
134b0fc5 1104 if (match)
1d28f42c 1105 ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid,
03e1ad7b 1106 dir);
2518c7c2 1107
134b0fc5 1108 return ret;
2518c7c2 1109}
1da177e4 1110
52479b62 1111static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
062cdb43 1112 const struct flowi *fl,
2518c7c2
DM		 1113 u16 family, u8 dir)
1114{
134b0fc5 1115 int err;
2518c7c2 1116 struct xfrm_policy *pol, *ret;
0b597e7e 1117 const xfrm_address_t *daddr, *saddr;
2518c7c2 1118 struct hlist_head *chain;
30846090
FW		 1119 unsigned int sequence;
1120 u32 priority;
df71837d 1121
2518c7c2
DM		 1122 daddr = xfrm_flowi_daddr(fl, family);
1123 saddr = xfrm_flowi_saddr(fl, family);
1124 if (unlikely(!daddr || !saddr))
1125 return NULL;
1126
a7c44247 1127 rcu_read_lock();
30846090
FW		 1128 retry:
1129 do {
1130 sequence = read_seqcount_begin(&xfrm_policy_hash_generation);
1131 chain = policy_hash_direct(net, daddr, saddr, family, dir);
1132 } while (read_seqcount_retry(&xfrm_policy_hash_generation, sequence));
1133
1134 priority = ~0U;
2518c7c2 1135 ret = NULL;
a5eefc1d 1136 hlist_for_each_entry_rcu(pol, chain, bydst) {
134b0fc5
JM		 1137 err = xfrm_policy_match(pol, fl, type, family, dir);
1138 if (err) {
1139 if (err == -ESRCH)
1140 continue;
1141 else {
1142 ret = ERR_PTR(err);
1143 goto fail;
1144 }
1145 } else {
2518c7c2 1146 ret = pol;
acba48e1 1147 priority = ret->priority;
2518c7c2
DM		 1148 break;
1149 }
1150 }
52479b62 1151 chain = &net->xfrm.policy_inexact[dir];
a5eefc1d 1152 hlist_for_each_entry_rcu(pol, chain, bydst) {
8faf491e
LR		 1153 if ((pol->priority >= priority) && ret)
1154 break;
1155
134b0fc5
JM		 1156 err = xfrm_policy_match(pol, fl, type, family, dir);
1157 if (err) {
1158 if (err == -ESRCH)
1159 continue;
1160 else {
1161 ret = ERR_PTR(err);
1162 goto fail;
1163 }
8faf491e 1164 } else {
acba48e1
DM		 1165 ret = pol;
1166 break;
1da177e4
LT		 1167 }
1168 }
586f2eb4 1169
30846090
FW		 1170 if (read_seqcount_retry(&xfrm_policy_hash_generation, sequence))
1171 goto retry;
1172
e37cc8ad
FW		 1173 if (ret && !xfrm_pol_hold_rcu(ret))
1174 goto retry;
134b0fc5 1175fail:
a7c44247 1176 rcu_read_unlock();
4e81bb83 1177
2518c7c2 1178 return ret;
4e81bb83
MN		 1179}
1180
80c802f3 1181static struct xfrm_policy *
73ff93cd 1182__xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir)
80c802f3
TT		 1183{
1184#ifdef CONFIG_XFRM_SUB_POLICY
1185 struct xfrm_policy *pol;
1186
1187 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir);
1188 if (pol != NULL)
1189 return pol;
1190#endif
1191 return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir);
1192}
1193
b5fb82c4
BZ		 1194static int flow_to_policy_dir(int dir)
1195{
1196 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
1197 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1198 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1199 return dir;
1200
1201 switch (dir) {
1202 default:
1203 case FLOW_DIR_IN:
1204 return XFRM_POLICY_IN;
1205 case FLOW_DIR_OUT:
1206 return XFRM_POLICY_OUT;
1207 case FLOW_DIR_FWD:
1208 return XFRM_POLICY_FWD;
1209 }
1210}
1211
fe1a5f03 1212static struct flow_cache_object *
dee9f4bc 1213xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family,
fe1a5f03 1214 u8 dir, struct flow_cache_object *old_obj, void *ctx)
4e81bb83
MN		 1215{
1216 struct xfrm_policy *pol;
fe1a5f03
TT		 1217
1218 if (old_obj)
1219 xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo));
4e81bb83 1220
b5fb82c4 1221 pol = __xfrm_policy_lookup(net, fl, family, flow_to_policy_dir(dir));
80c802f3 1222 if (IS_ERR_OR_NULL(pol))
fe1a5f03 1223 return ERR_CAST(pol);
fe1a5f03 1224
fe1a5f03
TT		 1225 /* Resolver returns two references:
1226 * one for cache and one for caller of flow_cache_lookup() */
1227 xfrm_pol_hold(pol);
1228
1229 return &pol->flo;
1da177e4
LT		 1230}
1231
df71837d
TJ		 1232static inline int policy_to_flow_dir(int dir)
1233{
1234 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
a716c119
YH		 1235 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1236 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1237 return dir;
1238 switch (dir) {
1239 default:
1240 case XFRM_POLICY_IN:
1241 return FLOW_DIR_IN;
1242 case XFRM_POLICY_OUT:
1243 return FLOW_DIR_OUT;
1244 case XFRM_POLICY_FWD:
1245 return FLOW_DIR_FWD;
3ff50b79 1246 }
df71837d
TJ		 1247}
1248
6f9c9615 1249static struct xfrm_policy *xfrm_sk_policy_lookup(const struct sock *sk, int dir,
4c86d777 1250 const struct flowi *fl, u16 family)
1da177e4
LT		 1251{
1252 struct xfrm_policy *pol;
1253
d188ba86 1254 rcu_read_lock();
ae33786f 1255 again:
d188ba86
ED		 1256 pol = rcu_dereference(sk->sk_policy[dir]);
1257 if (pol != NULL) {
4c86d777 1258 bool match = xfrm_selector_match(&pol->selector, fl, family);
a716c119 1259 int err = 0;
df71837d 1260
3bccfbc7 1261 if (match) {
34f8d884
JHS		 1262 if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
1263 pol = NULL;
1264 goto out;
1265 }
03e1ad7b 1266 err = security_xfrm_policy_lookup(pol->security,
1d28f42c 1267 fl->flowi_secid,
03e1ad7b 1268 policy_to_flow_dir(dir));
330e832a
FW		 1269 if (!err) {
1270 if (!xfrm_pol_hold_rcu(pol))
1271 goto again;
1272 } else if (err == -ESRCH) {
3bccfbc7 1273 pol = NULL;
330e832a 1274 } else {
3bccfbc7 1275 pol = ERR_PTR(err);
330e832a 1276 }
3bccfbc7 1277 } else
1da177e4
LT		 1278 pol = NULL;
1279 }
34f8d884 1280out:
d188ba86 1281 rcu_read_unlock();
1da177e4
LT		 1282 return pol;
1283}
1284
1285static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1286{
98806f75 1287 struct net *net = xp_net(pol);
4e81bb83 1288
98806f75 1289 list_add(&pol->walk.all, &net->xfrm.policy_all);
98806f75 1290 net->xfrm.policy_count[dir]++;
1da177e4
LT		 1291 xfrm_pol_hold(pol);
1292}
1293
1294static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1295 int dir)
1296{
98806f75
AD		 1297 struct net *net = xp_net(pol);
1298
53c2e285 1299 if (list_empty(&pol->walk.all))
2518c7c2 1300 return NULL;
1da177e4 1301
53c2e285
HX		 1302 /* Socket policies are not hashed. */
1303 if (!hlist_unhashed(&pol->bydst)) {
a5eefc1d 1304 hlist_del_rcu(&pol->bydst);
53c2e285
HX		 1305 hlist_del(&pol->byidx);
1306 }
1307
1308 list_del_init(&pol->walk.all);
98806f75 1309 net->xfrm.policy_count[dir]--;
2518c7c2
DM		 1310
1311 return pol;
1da177e4
LT		 1312}
1313
53c2e285
HX		 1314static void xfrm_sk_policy_link(struct xfrm_policy *pol, int dir)
1315{
1316 __xfrm_policy_link(pol, XFRM_POLICY_MAX + dir);
1317}
1318
1319static void xfrm_sk_policy_unlink(struct xfrm_policy *pol, int dir)
1320{
1321 __xfrm_policy_unlink(pol, XFRM_POLICY_MAX + dir);
1322}
1323
4666faab 1324int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1da177e4 1325{
283bc9f3
FD		 1326 struct net *net = xp_net(pol);
1327
9d0380df 1328 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 1329 pol = __xfrm_policy_unlink(pol, dir);
9d0380df 1330 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 1331 if (pol) {
1da177e4 1332 xfrm_policy_kill(pol);
4666faab 1333 return 0;
1da177e4 1334 }
4666faab 1335 return -ENOENT;
1da177e4 1336}
a70fcb0b 1337EXPORT_SYMBOL(xfrm_policy_delete);
1da177e4
LT		 1338
1339int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1340{
1121994c 1341 struct net *net = xp_net(pol);
1da177e4
LT		 1342 struct xfrm_policy *old_pol;
1343
4e81bb83
MN		 1344#ifdef CONFIG_XFRM_SUB_POLICY
1345 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1346 return -EINVAL;
1347#endif
1348
9d0380df 1349 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
d188ba86
ED		 1350 old_pol = rcu_dereference_protected(sk->sk_policy[dir],
1351 lockdep_is_held(&net->xfrm.xfrm_policy_lock));
1da177e4 1352 if (pol) {
9d729f72 1353 pol->curlft.add_time = get_seconds();
e682adf0 1354 pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir, 0);
53c2e285 1355 xfrm_sk_policy_link(pol, dir);
1da177e4 1356 }
d188ba86 1357 rcu_assign_pointer(sk->sk_policy[dir], pol);
a0073fe1
SK		 1358 if (old_pol) {
1359 if (pol)
1360 xfrm_policy_requeue(old_pol, pol);
1361
ea2dea9d
TT		 1362 /* Unlinking succeeds always. This is the only function
1363 * allowed to delete or replace socket policy.
1364 */
53c2e285 1365 xfrm_sk_policy_unlink(old_pol, dir);
a0073fe1 1366 }
9d0380df 1367 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 1368
1369 if (old_pol) {
1370 xfrm_policy_kill(old_pol);
1371 }
1372 return 0;
1373}
1374
d3e40a9f 1375static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir)
1da177e4 1376{
0331b1f3 1377 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
283bc9f3 1378 struct net *net = xp_net(old);
1da177e4
LT		 1379
1380 if (newp) {
1381 newp->selector = old->selector;
03e1ad7b
PM		 1382 if (security_xfrm_policy_clone(old->security,
1383 &newp->security)) {
df71837d
TJ		 1384 kfree(newp);
1385 return NULL; /* ENOMEM */
1386 }
1da177e4
LT		 1387 newp->lft = old->lft;
1388 newp->curlft = old->curlft;
fb977e2c 1389 newp->mark = old->mark;
1da177e4
LT		 1390 newp->action = old->action;
1391 newp->flags = old->flags;
1392 newp->xfrm_nr = old->xfrm_nr;
1393 newp->index = old->index;
4e81bb83 1394 newp->type = old->type;
1da177e4
LT		 1395 memcpy(newp->xfrm_vec, old->xfrm_vec,
1396 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
9d0380df 1397 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
53c2e285 1398 xfrm_sk_policy_link(newp, dir);
9d0380df 1399 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 1400 xfrm_pol_put(newp);
1401 }
1402 return newp;
1403}
1404
d188ba86 1405int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1da177e4 1406{
d188ba86
ED		 1407 const struct xfrm_policy *p;
1408 struct xfrm_policy *np;
1409 int i, ret = 0;
1410
1411 rcu_read_lock();
1412 for (i = 0; i < 2; i++) {
1413 p = rcu_dereference(osk->sk_policy[i]);
1414 if (p) {
1415 np = clone_policy(p, i);
1416 if (unlikely(!np)) {
1417 ret = -ENOMEM;
1418 break;
1419 }
1420 rcu_assign_pointer(sk->sk_policy[i], np);
1421 }
1422 }
1423 rcu_read_unlock();
1424 return ret;
1da177e4
LT		 1425}
1426
a1e59abf 1427static int
42a7b32b
DA		 1428xfrm_get_saddr(struct net *net, int oif, xfrm_address_t *local,
1429 xfrm_address_t *remote, unsigned short family)
a1e59abf
PM		 1430{
1431 int err;
37b10383 1432 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
a1e59abf
PM		 1433
1434 if (unlikely(afinfo == NULL))
1435 return -EINVAL;
42a7b32b 1436 err = afinfo->get_saddr(net, oif, local, remote);
bdba9fe0 1437 rcu_read_unlock();
a1e59abf
PM		 1438 return err;
1439}
1440
1da177e4
LT		 1441/* Resolve list of templates for the flow, given policy. */
1442
1443static int
a6c2e611
DM		 1444xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl,
1445 struct xfrm_state **xfrm, unsigned short family)
1da177e4 1446{
fbda33b2 1447 struct net *net = xp_net(policy);
1da177e4
LT		 1448 int nx;
1449 int i, error;
1450 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1451 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
a1e59abf 1452 xfrm_address_t tmp;
1da177e4 1453
9b7a787d 1454 for (nx = 0, i = 0; i < policy->xfrm_nr; i++) {
1da177e4
LT		 1455 struct xfrm_state *x;
1456 xfrm_address_t *remote = daddr;
1457 xfrm_address_t *local = saddr;
1458 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1459
48b8d783
JK		 1460 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1461 tmpl->mode == XFRM_MODE_BEET) {
1da177e4
LT		 1462 remote = &tmpl->id.daddr;
1463 local = &tmpl->saddr;
8444cf71 1464 if (xfrm_addr_any(local, tmpl->encap_family)) {
42a7b32b
DA		 1465 error = xfrm_get_saddr(net, fl->flowi_oif,
1466 &tmp, remote,
1467 tmpl->encap_family);
a1e59abf
PM		 1468 if (error)
1469 goto fail;
1470 local = &tmp;
1471 }
1da177e4
LT		 1472 }
1473
1474 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1475
1476 if (x && x->km.state == XFRM_STATE_VALID) {
1477 xfrm[nx++] = x;
1478 daddr = remote;
1479 saddr = local;
1480 continue;
1481 }
1482 if (x) {
1483 error = (x->km.state == XFRM_STATE_ERROR ?
1484 -EINVAL : -EAGAIN);
1485 xfrm_state_put(x);
42054569 1486 } else if (error == -ESRCH) {
a4322266 1487 error = -EAGAIN;
42054569 1488 }
1da177e4
LT		 1489
1490 if (!tmpl->optional)
1491 goto fail;
1492 }
1493 return nx;
1494
1495fail:
9b7a787d 1496 for (nx--; nx >= 0; nx--)
1da177e4
LT		 1497 xfrm_state_put(xfrm[nx]);
1498 return error;
1499}
1500
4e81bb83 1501static int
a6c2e611
DM		 1502xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl,
1503 struct xfrm_state **xfrm, unsigned short family)
4e81bb83 1504{
41a49cc3
MN		 1505 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1506 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
4e81bb83
MN		 1507 int cnx = 0;
1508 int error;
1509 int ret;
1510 int i;
1511
1512 for (i = 0; i < npols; i++) {
1513 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1514 error = -ENOBUFS;
1515 goto fail;
1516 }
41a49cc3
MN		 1517
1518 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
4e81bb83
MN		 1519 if (ret < 0) {
1520 error = ret;
1521 goto fail;
1522 } else
1523 cnx += ret;
1524 }
1525
41a49cc3
MN		 1526 /* found states are sorted for outbound processing */
1527 if (npols > 1)
1528 xfrm_state_sort(xfrm, tpp, cnx, family);
1529
4e81bb83
MN		 1530 return cnx;
1531
1532 fail:
9b7a787d 1533 for (cnx--; cnx >= 0; cnx--)
41a49cc3 1534 xfrm_state_put(tpp[cnx]);
4e81bb83
MN		 1535 return error;
1536
1537}
1538
f5e2bb4f 1539static int xfrm_get_tos(const struct flowi *fl, int family)
25ee3286 1540{
37b10383 1541 const struct xfrm_policy_afinfo *afinfo;
f5e2bb4f 1542 int tos = 0;
1da177e4 1543
f5e2bb4f
FW		 1544 afinfo = xfrm_policy_get_afinfo(family);
1545 tos = afinfo ? afinfo->get_tos(fl) : 0;
25ee3286 1546
bdba9fe0 1547 rcu_read_unlock();
25ee3286
HX		 1548
1549 return tos;
1550}
1551
80c802f3
TT		 1552static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo)
1553{
1554 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1555 struct dst_entry *dst = &xdst->u.dst;
1556
1557 if (xdst->route == NULL) {
1558 /* Dummy bundle - if it has xfrms we were not
1559 * able to build bundle as template resolution failed.
1560 * It means we need to try again resolving. */
1561 if (xdst->num_xfrms > 0)
1562 return NULL;
a0073fe1
SK		 1563 } else if (dst->flags & DST_XFRM_QUEUE) {
1564 return NULL;
80c802f3
TT		 1565 } else {
1566 /* Real bundle */
1567 if (stale_bundle(dst))
1568 return NULL;
1569 }
1570
1571 dst_hold(dst);
1572 return flo;
1573}
1574
1575static int xfrm_bundle_flo_check(struct flow_cache_object *flo)
1576{
1577 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1578 struct dst_entry *dst = &xdst->u.dst;
1579
1580 if (!xdst->route)
1581 return 0;
1582 if (stale_bundle(dst))
1583 return 0;
1584
1585 return 1;
1586}
1587
1588static void xfrm_bundle_flo_delete(struct flow_cache_object *flo)
1589{
1590 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1591 struct dst_entry *dst = &xdst->u.dst;
1592
1593 dst_free(dst);
1594}
1595
1596static const struct flow_cache_ops xfrm_bundle_fc_ops = {
1597 .get = xfrm_bundle_flo_get,
1598 .check = xfrm_bundle_flo_check,
1599 .delete = xfrm_bundle_flo_delete,
1600};
1601
d7c7544c 1602static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
1da177e4 1603{
37b10383 1604 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
d7c7544c 1605 struct dst_ops *dst_ops;
25ee3286
HX		 1606 struct xfrm_dst *xdst;
1607
1608 if (!afinfo)
1609 return ERR_PTR(-EINVAL);
1610
d7c7544c
AD		 1611 switch (family) {
1612 case AF_INET:
1613 dst_ops = &net->xfrm.xfrm4_dst_ops;
1614 break;
dfd56b8b 1615#if IS_ENABLED(CONFIG_IPV6)
d7c7544c
AD		 1616 case AF_INET6:
1617 dst_ops = &net->xfrm.xfrm6_dst_ops;
1618 break;
1619#endif
1620 default:
1621 BUG();
1622 }
f5b0a874 1623 xdst = dst_alloc(dst_ops, NULL, 0, DST_OBSOLETE_NONE, 0);
25ee3286 1624
d4cae562 1625 if (likely(xdst)) {
141e369d
SK		 1626 struct dst_entry *dst = &xdst->u.dst;
1627
1628 memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst));
0b150932 1629 xdst->flo.ops = &xfrm_bundle_fc_ops;
d4cae562 1630 } else
0b150932 1631 xdst = ERR_PTR(-ENOBUFS);
80c802f3 1632
bdba9fe0 1633 rcu_read_unlock();
d4cae562 1634
25ee3286
HX		 1635 return xdst;
1636}
1637
a1b05140
MN		 1638static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1639 int nfheader_len)
1640{
37b10383 1641 const struct xfrm_policy_afinfo *afinfo =
a1b05140
MN		 1642 xfrm_policy_get_afinfo(dst->ops->family);
1643 int err;
1644
1645 if (!afinfo)
1646 return -EINVAL;
1647
1648 err = afinfo->init_path(path, dst, nfheader_len);
1649
bdba9fe0 1650 rcu_read_unlock();
a1b05140
MN		 1651
1652 return err;
1653}
1654
87c1e12b 1655static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
0c7b3eef 1656 const struct flowi *fl)
25ee3286 1657{
37b10383 1658 const struct xfrm_policy_afinfo *afinfo =
25ee3286
HX		 1659 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1660 int err;
1661
1662 if (!afinfo)
1da177e4 1663 return -EINVAL;
25ee3286 1664
87c1e12b 1665 err = afinfo->fill_dst(xdst, dev, fl);
25ee3286 1666
bdba9fe0 1667 rcu_read_unlock();
25ee3286 1668
1da177e4
LT		 1669 return err;
1670}
1671
80c802f3 1672
25ee3286
HX		 1673/* Allocate chain of dst_entry's, attach known xfrm's, calculate
1674 * all the metrics... Shortly, bundle a bundle.
1675 */
1676
1677static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1678 struct xfrm_state **xfrm, int nx,
98313ada 1679 const struct flowi *fl,
25ee3286
HX		 1680 struct dst_entry *dst)
1681{
d7c7544c 1682 struct net *net = xp_net(policy);
25ee3286
HX		 1683 unsigned long now = jiffies;
1684 struct net_device *dev;
43a4dea4 1685 struct xfrm_mode *inner_mode;
25ee3286
HX		 1686 struct dst_entry *dst_prev = NULL;
1687 struct dst_entry *dst0 = NULL;
1688 int i = 0;
1689 int err;
1690 int header_len = 0;
a1b05140 1691 int nfheader_len = 0;
25ee3286
HX		 1692 int trailer_len = 0;
1693 int tos;
1694 int family = policy->selector.family;
9bb182a7
YH		 1695 xfrm_address_t saddr, daddr;
1696
1697 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
25ee3286
HX		 1698
1699 tos = xfrm_get_tos(fl, family);
25ee3286
HX		 1700
1701 dst_hold(dst);
1702
1703 for (; i < nx; i++) {
d7c7544c 1704 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
25ee3286
HX		 1705 struct dst_entry *dst1 = &xdst->u.dst;
1706
1707 err = PTR_ERR(xdst);
1708 if (IS_ERR(xdst)) {
1709 dst_release(dst);
1710 goto put_states;
1711 }
1712
43a4dea4
SK		 1713 if (xfrm[i]->sel.family == AF_UNSPEC) {
1714 inner_mode = xfrm_ip2inner_mode(xfrm[i],
1715 xfrm_af2proto(family));
1716 if (!inner_mode) {
1717 err = -EAFNOSUPPORT;
1718 dst_release(dst);
1719 goto put_states;
1720 }
1721 } else
1722 inner_mode = xfrm[i]->inner_mode;
1723
25ee3286
HX		 1724 if (!dst_prev)
1725 dst0 = dst1;
1726 else {
1727 dst_prev->child = dst_clone(dst1);
1728 dst1->flags |= DST_NOHASH;
1729 }
1730
1731 xdst->route = dst;
defb3519 1732 dst_copy_metrics(dst1, dst);
25ee3286
HX		 1733
1734 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1735 family = xfrm[i]->props.family;
42a7b32b
DA		 1736 dst = xfrm_dst_lookup(xfrm[i], tos, fl->flowi_oif,
1737 &saddr, &daddr, family);
25ee3286
HX		 1738 err = PTR_ERR(dst);
1739 if (IS_ERR(dst))
1740 goto put_states;
1741 } else
1742 dst_hold(dst);
1743
1744 dst1->xfrm = xfrm[i];
80c802f3 1745 xdst->xfrm_genid = xfrm[i]->genid;
25ee3286 1746
f5b0a874 1747 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
25ee3286
HX		 1748 dst1->flags |= DST_HOST;
1749 dst1->lastuse = now;
1750
1751 dst1->input = dst_discard;
43a4dea4 1752 dst1->output = inner_mode->afinfo->output;
25ee3286
HX		 1753
1754 dst1->next = dst_prev;
1755 dst_prev = dst1;
1756
1757 header_len += xfrm[i]->props.header_len;
a1b05140
MN		 1758 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1759 nfheader_len += xfrm[i]->props.header_len;
25ee3286
HX		 1760 trailer_len += xfrm[i]->props.trailer_len;
1761 }
1762
1763 dst_prev->child = dst;
1764 dst0->path = dst;
1765
1766 err = -ENODEV;
1767 dev = dst->dev;
1768 if (!dev)
1769 goto free_dst;
1770
a1b05140 1771 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
25ee3286
HX		 1772 xfrm_init_pmtu(dst_prev);
1773
1774 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1775 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1776
87c1e12b 1777 err = xfrm_fill_dst(xdst, dev, fl);
25ee3286
HX		 1778 if (err)
1779 goto free_dst;
1780
1781 dst_prev->header_len = header_len;
1782 dst_prev->trailer_len = trailer_len;
1783 header_len -= xdst->u.dst.xfrm->props.header_len;
1784 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1785 }
1786
1787out:
1788 return dst0;
1789
1790put_states:
1791 for (; i < nx; i++)
1792 xfrm_state_put(xfrm[i]);
1793free_dst:
1794 if (dst0)
1795 dst_free(dst0);
1796 dst0 = ERR_PTR(err);
1797 goto out;
1798}
1799
73ff93cd 1800static int xfrm_expand_policies(const struct flowi *fl, u16 family,
80c802f3
TT		 1801 struct xfrm_policy **pols,
1802 int *num_pols, int *num_xfrms)
1803{
1804 int i;
1805
1806 if (*num_pols == 0 || !pols[0]) {
1807 *num_pols = 0;
1808 *num_xfrms = 0;
1809 return 0;
1810 }
1811 if (IS_ERR(pols[0]))
1812 return PTR_ERR(pols[0]);
1813
1814 *num_xfrms = pols[0]->xfrm_nr;
1815
1816#ifdef CONFIG_XFRM_SUB_POLICY
1817 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1818 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1819 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1820 XFRM_POLICY_TYPE_MAIN,
1821 fl, family,
1822 XFRM_POLICY_OUT);
1823 if (pols[1]) {
1824 if (IS_ERR(pols[1])) {
1825 xfrm_pols_put(pols, *num_pols);
1826 return PTR_ERR(pols[1]);
1827 }
02d0892f 1828 (*num_pols)++;
80c802f3
TT		 1829 (*num_xfrms) += pols[1]->xfrm_nr;
1830 }
1831 }
1832#endif
1833 for (i = 0; i < *num_pols; i++) {
1834 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1835 *num_xfrms = -1;
1836 break;
1837 }
1838 }
1839
1840 return 0;
1841
1842}
1843
1844static struct xfrm_dst *
1845xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
4ca2e685 1846 const struct flowi *fl, u16 family,
80c802f3
TT		 1847 struct dst_entry *dst_orig)
1848{
1849 struct net *net = xp_net(pols[0]);
1850 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1851 struct dst_entry *dst;
1852 struct xfrm_dst *xdst;
1853 int err;
1854
1855 /* Try to instantiate a bundle */
1856 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
d809ec89
TT		 1857 if (err <= 0) {
1858 if (err != 0 && err != -EAGAIN)
80c802f3
TT		 1859 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1860 return ERR_PTR(err);
1861 }
1862
1863 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1864 if (IS_ERR(dst)) {
1865 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1866 return ERR_CAST(dst);
1867 }
1868
1869 xdst = (struct xfrm_dst *)dst;
1870 xdst->num_xfrms = err;
80c802f3 1871 xdst->num_pols = num_pols;
3e94c2dc 1872 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
80c802f3
TT		 1873 xdst->policy_genid = atomic_read(&pols[0]->genid);
1874
1875 return xdst;
1876}
1877
a0073fe1
SK		 1878static void xfrm_policy_queue_process(unsigned long arg)
1879{
a0073fe1
SK		 1880 struct sk_buff *skb;
1881 struct sock *sk;
1882 struct dst_entry *dst;
a0073fe1 1883 struct xfrm_policy *pol = (struct xfrm_policy *)arg;
3f5312ae 1884 struct net *net = xp_net(pol);
a0073fe1
SK		 1885 struct xfrm_policy_queue *pq = &pol->polq;
1886 struct flowi fl;
1887 struct sk_buff_head list;
1888
1889 spin_lock(&pq->hold_queue.lock);
1890 skb = skb_peek(&pq->hold_queue);
2bb53e25
SK		 1891 if (!skb) {
1892 spin_unlock(&pq->hold_queue.lock);
1893 goto out;
1894 }
a0073fe1
SK		 1895 dst = skb_dst(skb);
1896 sk = skb->sk;
1897 xfrm_decode_session(skb, &fl, dst->ops->family);
1898 spin_unlock(&pq->hold_queue.lock);
1899
1900 dst_hold(dst->path);
3f5312ae 1901 dst = xfrm_lookup(net, dst->path, &fl, sk, 0);
a0073fe1
SK		 1902 if (IS_ERR(dst))
1903 goto purge_queue;
1904
1905 if (dst->flags & DST_XFRM_QUEUE) {
1906 dst_release(dst);
1907
1908 if (pq->timeout >= XFRM_QUEUE_TMO_MAX)
1909 goto purge_queue;
1910
1911 pq->timeout = pq->timeout << 1;
e7d8f6cb
SK		 1912 if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout))
1913 xfrm_pol_hold(pol);
1914 goto out;
a0073fe1
SK		 1915 }
1916
1917 dst_release(dst);
1918
1919 __skb_queue_head_init(&list);
1920
1921 spin_lock(&pq->hold_queue.lock);
1922 pq->timeout = 0;
1923 skb_queue_splice_init(&pq->hold_queue, &list);
1924 spin_unlock(&pq->hold_queue.lock);
1925
1926 while (!skb_queue_empty(&list)) {
1927 skb = __skb_dequeue(&list);
1928
1929 xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family);
1930 dst_hold(skb_dst(skb)->path);
3f5312ae 1931 dst = xfrm_lookup(net, skb_dst(skb)->path, &fl, skb->sk, 0);
a0073fe1 1932 if (IS_ERR(dst)) {
a0073fe1
SK		 1933 kfree_skb(skb);
1934 continue;
1935 }
1936
1937 nf_reset(skb);
1938 skb_dst_drop(skb);
1939 skb_dst_set(skb, dst);
1940
13206b6b 1941 dst_output(net, skb->sk, skb);
a0073fe1
SK		 1942 }
1943
e7d8f6cb
SK		 1944out:
1945 xfrm_pol_put(pol);
a0073fe1
SK		 1946 return;
1947
1948purge_queue:
1949 pq->timeout = 0;
1ee5e667 1950 skb_queue_purge(&pq->hold_queue);
e7d8f6cb 1951 xfrm_pol_put(pol);
a0073fe1
SK		 1952}
1953
ede2059d 1954static int xdst_queue_output(struct net *net, struct sock *sk, struct sk_buff *skb)
a0073fe1
SK		 1955{
1956 unsigned long sched_next;
1957 struct dst_entry *dst = skb_dst(skb);
1958 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
e7d8f6cb
SK		 1959 struct xfrm_policy *pol = xdst->pols[0];
1960 struct xfrm_policy_queue *pq = &pol->polq;
4d53eff4 1961
39bb5e62 1962 if (unlikely(skb_fclone_busy(sk, skb))) {
4d53eff4
SK		 1963 kfree_skb(skb);
1964 return 0;
1965 }
a0073fe1
SK		 1966
1967 if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) {
1968 kfree_skb(skb);
1969 return -EAGAIN;
1970 }
1971
1972 skb_dst_force(skb);
a0073fe1
SK		 1973
1974 spin_lock_bh(&pq->hold_queue.lock);
1975
1976 if (!pq->timeout)
1977 pq->timeout = XFRM_QUEUE_TMO_MIN;
1978
1979 sched_next = jiffies + pq->timeout;
1980
1981 if (del_timer(&pq->hold_timer)) {
1982 if (time_before(pq->hold_timer.expires, sched_next))
1983 sched_next = pq->hold_timer.expires;
e7d8f6cb 1984 xfrm_pol_put(pol);
a0073fe1
SK		 1985 }
1986
1987 __skb_queue_tail(&pq->hold_queue, skb);
e7d8f6cb
SK		 1988 if (!mod_timer(&pq->hold_timer, sched_next))
1989 xfrm_pol_hold(pol);
a0073fe1
SK		 1990
1991 spin_unlock_bh(&pq->hold_queue.lock);
1992
1993 return 0;
1994}
1995
1996static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net,
b8c203b2 1997 struct xfrm_flo *xflo,
a0073fe1
SK		 1998 const struct flowi *fl,
1999 int num_xfrms,
2000 u16 family)
2001{
2002 int err;
2003 struct net_device *dev;
b8c203b2 2004 struct dst_entry *dst;
a0073fe1
SK		 2005 struct dst_entry *dst1;
2006 struct xfrm_dst *xdst;
2007
2008 xdst = xfrm_alloc_dst(net, family);
2009 if (IS_ERR(xdst))
2010 return xdst;
2011
b8c203b2
SK		 2012 if (!(xflo->flags & XFRM_LOOKUP_QUEUE) ||
2013 net->xfrm.sysctl_larval_drop ||
2014 num_xfrms <= 0)
a0073fe1
SK		 2015 return xdst;
2016
b8c203b2 2017 dst = xflo->dst_orig;
a0073fe1
SK		 2018 dst1 = &xdst->u.dst;
2019 dst_hold(dst);
2020 xdst->route = dst;
2021
2022 dst_copy_metrics(dst1, dst);
2023
2024 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
2025 dst1->flags |= DST_HOST | DST_XFRM_QUEUE;
2026 dst1->lastuse = jiffies;
2027
2028 dst1->input = dst_discard;
2029 dst1->output = xdst_queue_output;
2030
2031 dst_hold(dst);
2032 dst1->child = dst;
2033 dst1->path = dst;
2034
2035 xfrm_init_path((struct xfrm_dst *)dst1, dst, 0);
2036
2037 err = -ENODEV;
2038 dev = dst->dev;
2039 if (!dev)
2040 goto free_dst;
2041
2042 err = xfrm_fill_dst(xdst, dev, fl);
2043 if (err)
2044 goto free_dst;
2045
2046out:
2047 return xdst;
2048
2049free_dst:
2050 dst_release(dst1);
2051 xdst = ERR_PTR(err);
2052 goto out;
2053}
2054
80c802f3 2055static struct flow_cache_object *
dee9f4bc 2056xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir,
80c802f3
TT		 2057 struct flow_cache_object *oldflo, void *ctx)
2058{
b8c203b2 2059 struct xfrm_flo *xflo = (struct xfrm_flo *)ctx;
80c802f3
TT		 2060 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2061 struct xfrm_dst *xdst, *new_xdst;
2062 int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
2063
2064 /* Check if the policies from old bundle are usable */
2065 xdst = NULL;
2066 if (oldflo) {
2067 xdst = container_of(oldflo, struct xfrm_dst, flo);
2068 num_pols = xdst->num_pols;
2069 num_xfrms = xdst->num_xfrms;
2070 pol_dead = 0;
2071 for (i = 0; i < num_pols; i++) {
2072 pols[i] = xdst->pols[i];
2073 pol_dead |= pols[i]->walk.dead;
2074 }
2075 if (pol_dead) {
2076 dst_free(&xdst->u.dst);
2077 xdst = NULL;
2078 num_pols = 0;
2079 num_xfrms = 0;
2080 oldflo = NULL;
2081 }
2082 }
2083
2084 /* Resolve policies to use if we couldn't get them from
2085 * previous cache entry */
2086 if (xdst == NULL) {
2087 num_pols = 1;
b5fb82c4
BZ		 2088 pols[0] = __xfrm_policy_lookup(net, fl, family,
2089 flow_to_policy_dir(dir));
80c802f3
TT		 2090 err = xfrm_expand_policies(fl, family, pols,
2091 &num_pols, &num_xfrms);
2092 if (err < 0)
2093 goto inc_error;
2094 if (num_pols == 0)
2095 return NULL;
2096 if (num_xfrms <= 0)
2097 goto make_dummy_bundle;
2098 }
2099
b8c203b2
SK		 2100 new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family,
2101 xflo->dst_orig);
80c802f3
TT		 2102 if (IS_ERR(new_xdst)) {
2103 err = PTR_ERR(new_xdst);
2104 if (err != -EAGAIN)
2105 goto error;
2106 if (oldflo == NULL)
2107 goto make_dummy_bundle;
2108 dst_hold(&xdst->u.dst);
2109 return oldflo;
d809ec89
TT		 2110 } else if (new_xdst == NULL) {
2111 num_xfrms = 0;
2112 if (oldflo == NULL)
2113 goto make_dummy_bundle;
2114 xdst->num_xfrms = 0;
2115 dst_hold(&xdst->u.dst);
2116 return oldflo;
80c802f3
TT		 2117 }
2118
2119 /* Kill the previous bundle */
2120 if (xdst) {
2121 /* The policies were stolen for newly generated bundle */
2122 xdst->num_pols = 0;
2123 dst_free(&xdst->u.dst);
2124 }
2125
2126 /* Flow cache does not have reference, it dst_free()'s,
2127 * but we do need to return one reference for original caller */
2128 dst_hold(&new_xdst->u.dst);
2129 return &new_xdst->flo;
2130
2131make_dummy_bundle:
2132 /* We found policies, but there's no bundles to instantiate:
2133 * either because the policy blocks, has no transformations or
2134 * we could not build template (no xfrm_states).*/
b8c203b2 2135 xdst = xfrm_create_dummy_bundle(net, xflo, fl, num_xfrms, family);
80c802f3
TT		 2136 if (IS_ERR(xdst)) {
2137 xfrm_pols_put(pols, num_pols);
2138 return ERR_CAST(xdst);
2139 }
2140 xdst->num_pols = num_pols;
2141 xdst->num_xfrms = num_xfrms;
3e94c2dc 2142 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
80c802f3
TT		 2143
2144 dst_hold(&xdst->u.dst);
2145 return &xdst->flo;
2146
2147inc_error:
2148 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
2149error:
2150 if (xdst != NULL)
2151 dst_free(&xdst->u.dst);
2152 else
2153 xfrm_pols_put(pols, num_pols);
2154 return ERR_PTR(err);
2155}
1da177e4 2156
2774c131
DM		 2157static struct dst_entry *make_blackhole(struct net *net, u16 family,
2158 struct dst_entry *dst_orig)
2159{
37b10383 2160 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
2774c131
DM		 2161 struct dst_entry *ret;
2162
2163 if (!afinfo) {
2164 dst_release(dst_orig);
433a1954 2165 return ERR_PTR(-EINVAL);
2774c131
DM		 2166 } else {
2167 ret = afinfo->blackhole_route(net, dst_orig);
2168 }
bdba9fe0 2169 rcu_read_unlock();
2774c131
DM		 2170
2171 return ret;
2172}
2173
1da177e4
LT		 2174/* Main function: finds/creates a bundle for given flow.
2175 *
2176 * At the moment we eat a raw IP route. Mostly to speed up lookups
2177 * on interfaces with disabled IPsec.
2178 */
452edd59
DM		 2179struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
2180 const struct flowi *fl,
6f9c9615 2181 const struct sock *sk, int flags)
1da177e4 2182{
4e81bb83 2183 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
80c802f3
TT		 2184 struct flow_cache_object *flo;
2185 struct xfrm_dst *xdst;
452edd59 2186 struct dst_entry *dst, *route;
80c802f3 2187 u16 family = dst_orig->ops->family;
df71837d 2188 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
4b021628 2189 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
e0d1caa7 2190
80c802f3
TT		 2191 dst = NULL;
2192 xdst = NULL;
2193 route = NULL;
4e81bb83 2194
bd5eb35f 2195 sk = sk_const_to_full_sk(sk);
f7944fb1 2196 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
80c802f3 2197 num_pols = 1;
4c86d777 2198 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl, family);
80c802f3
TT		 2199 err = xfrm_expand_policies(fl, family, pols,
2200 &num_pols, &num_xfrms);
2201 if (err < 0)
75b8c133 2202 goto dropdst;
80c802f3
TT		 2203
2204 if (num_pols) {
2205 if (num_xfrms <= 0) {
2206 drop_pols = num_pols;
2207 goto no_transform;
2208 }
2209
2210 xdst = xfrm_resolve_and_create_bundle(
2211 pols, num_pols, fl,
2212 family, dst_orig);
2213 if (IS_ERR(xdst)) {
2214 xfrm_pols_put(pols, num_pols);
2215 err = PTR_ERR(xdst);
2216 goto dropdst;
d809ec89
TT		 2217 } else if (xdst == NULL) {
2218 num_xfrms = 0;
2219 drop_pols = num_pols;
2220 goto no_transform;
80c802f3
TT		 2221 }
2222
b7eea454
SK		 2223 dst_hold(&xdst->u.dst);
2224 xdst->u.dst.flags |= DST_NOCACHE;
80c802f3 2225 route = xdst->route;
0aa64774 2226 }
3bccfbc7 2227 }
1da177e4 2228
80c802f3 2229 if (xdst == NULL) {
b8c203b2
SK		 2230 struct xfrm_flo xflo;
2231
2232 xflo.dst_orig = dst_orig;
2233 xflo.flags = flags;
2234
1da177e4 2235 /* To accelerate a bit... */
2518c7c2 2236 if ((dst_orig->flags & DST_NOXFRM) ||
52479b62 2237 !net->xfrm.policy_count[XFRM_POLICY_OUT])
8b7817f3 2238 goto nopol;
1da177e4 2239
80c802f3 2240 flo = flow_cache_lookup(net, fl, family, dir,
b8c203b2 2241 xfrm_bundle_lookup, &xflo);
80c802f3
TT		 2242 if (flo == NULL)
2243 goto nopol;
fe1a5f03 2244 if (IS_ERR(flo)) {
80c802f3 2245 err = PTR_ERR(flo);
75b8c133 2246 goto dropdst;
d66e37a9 2247 }
80c802f3
TT		 2248 xdst = container_of(flo, struct xfrm_dst, flo);
2249
2250 num_pols = xdst->num_pols;
2251 num_xfrms = xdst->num_xfrms;
3e94c2dc 2252 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy *) * num_pols);
80c802f3
TT		 2253 route = xdst->route;
2254 }
2255
2256 dst = &xdst->u.dst;
2257 if (route == NULL && num_xfrms > 0) {
2258 /* The only case when xfrm_bundle_lookup() returns a
2259 * bundle with null route, is when the template could
2260 * not be resolved. It means policies are there, but
2261 * bundle could not be created, since we don't yet
2262 * have the xfrm_state's. We need to wait for KM to
2263 * negotiate new SA's or bail out with error.*/
2264 if (net->xfrm.sysctl_larval_drop) {
80c802f3 2265 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
ac37e251
W		 2266 err = -EREMOTE;
2267 goto error;
80c802f3 2268 }
80c802f3 2269
5b8ef341 2270 err = -EAGAIN;
80c802f3
TT		 2271
2272 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
2273 goto error;
1da177e4
LT		 2274 }
2275
80c802f3
TT		 2276no_transform:
2277 if (num_pols == 0)
8b7817f3 2278 goto nopol;
1da177e4 2279
80c802f3
TT		 2280 if ((flags & XFRM_LOOKUP_ICMP) &&
2281 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
2282 err = -ENOENT;
8b7817f3 2283 goto error;
80c802f3 2284 }
8b7817f3 2285
80c802f3
TT		 2286 for (i = 0; i < num_pols; i++)
2287 pols[i]->curlft.use_time = get_seconds();
8b7817f3 2288
80c802f3 2289 if (num_xfrms < 0) {
1da177e4 2290 /* Prohibit the flow */
59c9940e 2291 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
e104411b
PM		 2292 err = -EPERM;
2293 goto error;
80c802f3
TT		 2294 } else if (num_xfrms > 0) {
2295 /* Flow transformed */
80c802f3
TT		 2296 dst_release(dst_orig);
2297 } else {
2298 /* Flow passes untransformed */
2299 dst_release(dst);
452edd59 2300 dst = dst_orig;
1da177e4 2301 }
80c802f3
TT		 2302ok:
2303 xfrm_pols_put(pols, drop_pols);
0c183379
G		 2304 if (dst && dst->xfrm &&
2305 dst->xfrm->props.mode == XFRM_MODE_TUNNEL)
2306 dst->flags |= DST_XFRM_TUNNEL;
452edd59 2307 return dst;
1da177e4 2308
80c802f3 2309nopol:
452edd59
DM		 2310 if (!(flags & XFRM_LOOKUP_ICMP)) {
2311 dst = dst_orig;
80c802f3 2312 goto ok;
452edd59 2313 }
80c802f3 2314 err = -ENOENT;
1da177e4 2315error:
80c802f3 2316 dst_release(dst);
75b8c133 2317dropdst:
ac37e251
W		 2318 if (!(flags & XFRM_LOOKUP_KEEP_DST_REF))
2319 dst_release(dst_orig);
80c802f3 2320 xfrm_pols_put(pols, drop_pols);
452edd59 2321 return ERR_PTR(err);
1da177e4
LT		 2322}
2323EXPORT_SYMBOL(xfrm_lookup);
2324
f92ee619
SK		 2325/* Callers of xfrm_lookup_route() must ensure a call to dst_output().
2326 * Otherwise we may send out blackholed packets.
2327 */
2328struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig,
2329 const struct flowi *fl,
6f9c9615 2330 const struct sock *sk, int flags)
f92ee619 2331{
b8c203b2 2332 struct dst_entry *dst = xfrm_lookup(net, dst_orig, fl, sk,
ac37e251
W		 2333 flags | XFRM_LOOKUP_QUEUE |
2334 XFRM_LOOKUP_KEEP_DST_REF);
f92ee619
SK		 2335
2336 if (IS_ERR(dst) && PTR_ERR(dst) == -EREMOTE)
2337 return make_blackhole(net, dst_orig->ops->family, dst_orig);
2338
2339 return dst;
2340}
2341EXPORT_SYMBOL(xfrm_lookup_route);
2342
df0ba92a 2343static inline int
8f029de2 2344xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl)
df0ba92a
MN		 2345{
2346 struct xfrm_state *x;
df0ba92a
MN		 2347
2348 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
2349 return 0;
2350 x = skb->sp->xvec[idx];
2351 if (!x->type->reject)
2352 return 0;
1ecafede 2353 return x->type->reject(x, skb, fl);
df0ba92a
MN		 2354}
2355
1da177e4
LT		 2356/* When skb is transformed back to its "native" form, we have to
2357 * check policy restrictions. At the moment we make this in maximally
2358 * stupid way. Shame on me. :-) Of course, connected sockets must
2359 * have policy cached at them.
2360 */
2361
2362static inline int
7db454b9 2363xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x,
1da177e4
LT		 2364 unsigned short family)
2365{
2366 if (xfrm_state_kern(x))
928ba416 2367 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
1da177e4
LT		 2368 return x->id.proto == tmpl->id.proto &&
2369 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
2370 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
2371 x->props.mode == tmpl->mode &&
c5d18e98 2372 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
f3bd4840 2373 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
7e49e6de
MN		 2374 !(x->props.mode != XFRM_MODE_TRANSPORT &&
2375 xfrm_state_addr_cmp(tmpl, x, family));
1da177e4
LT		 2376}
2377
df0ba92a
MN		 2378/*
2379 * 0 or more than 0 is returned when validation is succeeded (either bypass
2380 * because of optional transport mode, or next index of the mathced secpath
2381 * state with the template.
2382 * -1 is returned when no matching template is found.
2383 * Otherwise "-2 - errored_index" is returned.
2384 */
1da177e4 2385static inline int
22cccb7e 2386xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start,
1da177e4
LT		 2387 unsigned short family)
2388{
2389 int idx = start;
2390
2391 if (tmpl->optional) {
7e49e6de 2392 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1da177e4
LT		 2393 return start;
2394 } else
2395 start = -1;
2396 for (; idx < sp->len; idx++) {
dbe5b4aa 2397 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
1da177e4 2398 return ++idx;
df0ba92a
MN		 2399 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
2400 if (start == -1)
2401 start = -2-idx;
1da177e4 2402 break;
df0ba92a 2403 }
1da177e4
LT		 2404 }
2405 return start;
2406}
2407
d5422efe
HX		 2408int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
2409 unsigned int family, int reverse)
1da177e4 2410{
37b10383 2411 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
e0d1caa7 2412 int err;
1da177e4
LT		 2413
2414 if (unlikely(afinfo == NULL))
2415 return -EAFNOSUPPORT;
2416
d5422efe 2417 afinfo->decode_session(skb, fl, reverse);
1d28f42c 2418 err = security_xfrm_decode_session(skb, &fl->flowi_secid);
bdba9fe0 2419 rcu_read_unlock();
e0d1caa7 2420 return err;
1da177e4 2421}
d5422efe 2422EXPORT_SYMBOL(__xfrm_decode_session);
1da177e4 2423
9a7386ec 2424static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp)
1da177e4
LT		 2425{
2426 for (; k < sp->len; k++) {
df0ba92a 2427 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
d1d9facf 2428 *idxp = k;
1da177e4 2429 return 1;
df0ba92a 2430 }
1da177e4
LT		 2431 }
2432
2433 return 0;
2434}
2435
a716c119 2436int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
1da177e4
LT		 2437 unsigned short family)
2438{
f6e1e25d 2439 struct net *net = dev_net(skb->dev);
1da177e4 2440 struct xfrm_policy *pol;
4e81bb83
MN		 2441 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2442 int npols = 0;
2443 int xfrm_nr;
2444 int pi;
d5422efe 2445 int reverse;
1da177e4 2446 struct flowi fl;
d5422efe 2447 u8 fl_dir;
df0ba92a 2448 int xerr_idx = -1;
1da177e4 2449
d5422efe
HX		 2450 reverse = dir & ~XFRM_POLICY_MASK;
2451 dir &= XFRM_POLICY_MASK;
2452 fl_dir = policy_to_flow_dir(dir);
2453
0aa64774 2454 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
59c9940e 2455 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
1da177e4 2456 return 0;
0aa64774
MN		 2457 }
2458
eb9c7ebe 2459 nf_nat_decode_session(skb, &fl, family);
1da177e4
LT		 2460
2461 /* First, check used SA against their selectors. */
2462 if (skb->sp) {
2463 int i;
2464
9b7a787d 2465 for (i = skb->sp->len-1; i >= 0; i--) {
dbe5b4aa 2466 struct xfrm_state *x = skb->sp->xvec[i];
0aa64774 2467 if (!xfrm_selector_match(&x->sel, &fl, family)) {
59c9940e 2468 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
1da177e4 2469 return 0;
0aa64774 2470 }
1da177e4
LT		 2471 }
2472 }
2473
2474 pol = NULL;
bd5eb35f 2475 sk = sk_to_full_sk(sk);
3bccfbc7 2476 if (sk && sk->sk_policy[dir]) {
4c86d777 2477 pol = xfrm_sk_policy_lookup(sk, dir, &fl, family);
0aa64774 2478 if (IS_ERR(pol)) {
59c9940e 2479 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
3bccfbc7 2480 return 0;
0aa64774 2481 }
3bccfbc7 2482 }
1da177e4 2483
fe1a5f03
TT		 2484 if (!pol) {
2485 struct flow_cache_object *flo;
2486
2487 flo = flow_cache_lookup(net, &fl, family, fl_dir,
2488 xfrm_policy_lookup, NULL);
2489 if (IS_ERR_OR_NULL(flo))
2490 pol = ERR_CAST(flo);
2491 else
2492 pol = container_of(flo, struct xfrm_policy, flo);
2493 }
1da177e4 2494
0aa64774 2495 if (IS_ERR(pol)) {
59c9940e 2496 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
134b0fc5 2497 return 0;
0aa64774 2498 }
134b0fc5 2499
df0ba92a 2500 if (!pol) {
d1d9facf 2501 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
df0ba92a 2502 xfrm_secpath_reject(xerr_idx, skb, &fl);
59c9940e 2503 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
df0ba92a
MN		 2504 return 0;
2505 }
2506 return 1;
2507 }
1da177e4 2508
9d729f72 2509 pol->curlft.use_time = get_seconds();
1da177e4 2510
4e81bb83 2511 pols[0] = pol;
02d0892f 2512 npols++;
4e81bb83
MN		 2513#ifdef CONFIG_XFRM_SUB_POLICY
2514 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
f6e1e25d 2515 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
4e81bb83
MN		 2516 &fl, family,
2517 XFRM_POLICY_IN);
2518 if (pols[1]) {
0aa64774 2519 if (IS_ERR(pols[1])) {
59c9940e 2520 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
134b0fc5 2521 return 0;
0aa64774 2522 }
9d729f72 2523 pols[1]->curlft.use_time = get_seconds();
02d0892f 2524 npols++;
4e81bb83
MN		 2525 }
2526 }
2527#endif
2528
1da177e4
LT		 2529 if (pol->action == XFRM_POLICY_ALLOW) {
2530 struct sec_path *sp;
2531 static struct sec_path dummy;
4e81bb83 2532 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
41a49cc3 2533 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
4e81bb83
MN		 2534 struct xfrm_tmpl **tpp = tp;
2535 int ti = 0;
1da177e4
LT		 2536 int i, k;
2537
2538 if ((sp = skb->sp) == NULL)
2539 sp = &dummy;
2540
4e81bb83
MN		 2541 for (pi = 0; pi < npols; pi++) {
2542 if (pols[pi] != pol &&
0aa64774 2543 pols[pi]->action != XFRM_POLICY_ALLOW) {
59c9940e 2544 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
4e81bb83 2545 goto reject;
0aa64774
MN		 2546 }
2547 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
59c9940e 2548 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
4e81bb83 2549 goto reject_error;
0aa64774 2550 }
4e81bb83
MN		 2551 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2552 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2553 }
2554 xfrm_nr = ti;
41a49cc3 2555 if (npols > 1) {
283bc9f3 2556 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family, net);
41a49cc3
MN		 2557 tpp = stp;
2558 }
4e81bb83 2559
1da177e4
LT		 2560 /* For each tunnel xfrm, find the first matching tmpl.
2561 * For each tmpl before that, find corresponding xfrm.
2562 * Order is _important_. Later we will implement
2563 * some barriers, but at the moment barriers
2564 * are implied between each two transformations.
2565 */
4e81bb83
MN		 2566 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2567 k = xfrm_policy_ok(tpp[i], sp, k, family);
df0ba92a 2568 if (k < 0) {
d1d9facf
JM		 2569 if (k < -1)
2570 /* "-2 - errored_index" returned */
2571 xerr_idx = -(2+k);
59c9940e 2572 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
1da177e4 2573 goto reject;
df0ba92a 2574 }
1da177e4
LT		 2575 }
2576
0aa64774 2577 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
59c9940e 2578 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
1da177e4 2579 goto reject;
0aa64774 2580 }
1da177e4 2581
4e81bb83 2582 xfrm_pols_put(pols, npols);
1da177e4
LT		 2583 return 1;
2584 }
59c9940e 2585 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
1da177e4
LT		 2586
2587reject:
df0ba92a 2588 xfrm_secpath_reject(xerr_idx, skb, &fl);
4e81bb83
MN		 2589reject_error:
2590 xfrm_pols_put(pols, npols);
1da177e4
LT		 2591 return 0;
2592}
2593EXPORT_SYMBOL(__xfrm_policy_check);
2594
2595int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2596{
99a66657 2597 struct net *net = dev_net(skb->dev);
1da177e4 2598 struct flowi fl;
adf30907 2599 struct dst_entry *dst;
73137147 2600 int res = 1;
1da177e4 2601
0aa64774 2602 if (xfrm_decode_session(skb, &fl, family) < 0) {
72032fdb 2603 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
1da177e4 2604 return 0;
0aa64774 2605 }
1da177e4 2606
fafeeb6c 2607 skb_dst_force(skb);
adf30907 2608
b8c203b2 2609 dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, XFRM_LOOKUP_QUEUE);
452edd59 2610 if (IS_ERR(dst)) {
73137147 2611 res = 0;
452edd59
DM		 2612 dst = NULL;
2613 }
adf30907
ED		 2614 skb_dst_set(skb, dst);
2615 return res;
1da177e4
LT		 2616}
2617EXPORT_SYMBOL(__xfrm_route_forward);
2618
d49c73c7
DM		 2619/* Optimize later using cookies and generation ids. */
2620
1da177e4
LT		 2621static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2622{
d49c73c7 2623 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
f5b0a874
DM		 2624 * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to
2625 * get validated by dst_ops->check on every use. We do this
2626 * because when a normal route referenced by an XFRM dst is
2627 * obsoleted we do not go looking around for all parent
2628 * referencing XFRM dsts so that we can invalidate them. It
2629 * is just too much work. Instead we make the checks here on
2630 * every use. For example:
d49c73c7
DM		 2631 *
2632 * XFRM dst A --> IPv4 dst X
2633 *
2634 * X is the "xdst->route" of A (X is also the "dst->path" of A
2635 * in this example). If X is marked obsolete, "A" will not
2636 * notice. That's what we are validating here via the
2637 * stale_bundle() check.
2638 *
2639 * When a policy's bundle is pruned, we dst_free() the XFRM
f5b0a874
DM		 2640 * dst which causes it's ->obsolete field to be set to
2641 * DST_OBSOLETE_DEAD. If an XFRM dst has been pruned like
2642 * this, we want to force a new route lookup.
399c180a 2643 */
d49c73c7
DM		 2644 if (dst->obsolete < 0 && !stale_bundle(dst))
2645 return dst;
2646
1da177e4
LT		 2647 return NULL;
2648}
2649
2650static int stale_bundle(struct dst_entry *dst)
2651{
12fdb4d3 2652 return !xfrm_bundle_ok((struct xfrm_dst *)dst);
1da177e4
LT		 2653}
2654
aabc9761 2655void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
1da177e4 2656{
1da177e4 2657 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
c346dca1 2658 dst->dev = dev_net(dev)->loopback_dev;
de3cb747 2659 dev_hold(dst->dev);
1da177e4
LT		 2660 dev_put(dev);
2661 }
2662}
aabc9761 2663EXPORT_SYMBOL(xfrm_dst_ifdown);
1da177e4
LT		 2664
2665static void xfrm_link_failure(struct sk_buff *skb)
2666{
2667 /* Impossible. Such dst must be popped before reaches point of failure. */
1da177e4
LT		 2668}
2669
2670static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2671{
2672 if (dst) {
2673 if (dst->obsolete) {
2674 dst_release(dst);
2675 dst = NULL;
2676 }
2677 }
2678 return dst;
2679}
2680
e4c17216 2681void xfrm_garbage_collect(struct net *net)
c0ed1c14 2682{
ca925cf1 2683 flow_cache_flush(net);
c0ed1c14 2684}
e4c17216 2685EXPORT_SYMBOL(xfrm_garbage_collect);
c0ed1c14 2686
3d7d25a6 2687void xfrm_garbage_collect_deferred(struct net *net)
c0ed1c14 2688{
ca925cf1 2689 flow_cache_flush_deferred(net);
c0ed1c14 2690}
3d7d25a6 2691EXPORT_SYMBOL(xfrm_garbage_collect_deferred);
c0ed1c14 2692
25ee3286 2693static void xfrm_init_pmtu(struct dst_entry *dst)
1da177e4
LT		 2694{
2695 do {
2696 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2697 u32 pmtu, route_mtu_cached;
2698
2699 pmtu = dst_mtu(dst->child);
2700 xdst->child_mtu_cached = pmtu;
2701
2702 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2703
2704 route_mtu_cached = dst_mtu(xdst->route);
2705 xdst->route_mtu_cached = route_mtu_cached;
2706
2707 if (pmtu > route_mtu_cached)
2708 pmtu = route_mtu_cached;
2709
defb3519 2710 dst_metric_set(dst, RTAX_MTU, pmtu);
1da177e4
LT		 2711 } while ((dst = dst->next));
2712}
2713
1da177e4
LT		 2714/* Check that the bundle accepts the flow and its components are
2715 * still valid.
2716 */
2717
12fdb4d3 2718static int xfrm_bundle_ok(struct xfrm_dst *first)
1da177e4
LT		 2719{
2720 struct dst_entry *dst = &first->u.dst;
2721 struct xfrm_dst *last;
2722 u32 mtu;
2723
92d63dec 2724 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
1da177e4
LT		 2725 (dst->dev && !netif_running(dst->dev)))
2726 return 0;
2727
a0073fe1
SK		 2728 if (dst->flags & DST_XFRM_QUEUE)
2729 return 1;
2730
1da177e4
LT		 2731 last = NULL;
2732
2733 do {
2734 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2735
1da177e4
LT		 2736 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2737 return 0;
80c802f3
TT		 2738 if (xdst->xfrm_genid != dst->xfrm->genid)
2739 return 0;
b1312c89
TT		 2740 if (xdst->num_pols > 0 &&
2741 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
9d4a706d 2742 return 0;
e53820de 2743
1da177e4
LT		 2744 mtu = dst_mtu(dst->child);
2745 if (xdst->child_mtu_cached != mtu) {
2746 last = xdst;
2747 xdst->child_mtu_cached = mtu;
2748 }
2749
92d63dec 2750 if (!dst_check(xdst->route, xdst->route_cookie))
1da177e4
LT		 2751 return 0;
2752 mtu = dst_mtu(xdst->route);
2753 if (xdst->route_mtu_cached != mtu) {
2754 last = xdst;
2755 xdst->route_mtu_cached = mtu;
2756 }
2757
2758 dst = dst->child;
2759 } while (dst->xfrm);
2760
2761 if (likely(!last))
2762 return 1;
2763
2764 mtu = last->child_mtu_cached;
2765 for (;;) {
2766 dst = &last->u.dst;
2767
2768 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2769 if (mtu > last->route_mtu_cached)
2770 mtu = last->route_mtu_cached;
defb3519 2771 dst_metric_set(dst, RTAX_MTU, mtu);
1da177e4
LT		 2772
2773 if (last == first)
2774 break;
2775
bd0bf076 2776 last = (struct xfrm_dst *)last->u.dst.next;
1da177e4
LT		 2777 last->child_mtu_cached = mtu;
2778 }
2779
2780 return 1;
2781}
2782
0dbaee3b
DM		 2783static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
2784{
2785 return dst_metric_advmss(dst->path);
2786}
2787
ebb762f2 2788static unsigned int xfrm_mtu(const struct dst_entry *dst)
d33e4553 2789{
618f9bc7
SK		 2790 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
2791
2792 return mtu ? : dst_mtu(dst->path);
d33e4553
DM		 2793}
2794
1ecc9ad0
JA		 2795static const void *xfrm_get_dst_nexthop(const struct dst_entry *dst,
2796 const void *daddr)
63fca65d
JA		 2797{
2798 const struct dst_entry *path = dst->path;
2799
2800 for (; dst != path; dst = dst->child) {
2801 const struct xfrm_state *xfrm = dst->xfrm;
2802
2803 if (xfrm->props.mode == XFRM_MODE_TRANSPORT)
2804 continue;
2805 if (xfrm->type->flags & XFRM_TYPE_REMOTE_COADDR)
2806 daddr = xfrm->coaddr;
2807 else if (!(xfrm->type->flags & XFRM_TYPE_LOCAL_COADDR))
2808 daddr = &xfrm->id.daddr;
2809 }
1ecc9ad0
JA		 2810 return daddr;
2811}
2812
2813static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst,
2814 struct sk_buff *skb,
2815 const void *daddr)
2816{
2817 const struct dst_entry *path = dst->path;
2818
2819 if (!skb)
2820 daddr = xfrm_get_dst_nexthop(dst, daddr);
2821 return path->ops->neigh_lookup(path, skb, daddr);
2822}
2823
2824static void xfrm_confirm_neigh(const struct dst_entry *dst, const void *daddr)
2825{
2826 const struct dst_entry *path = dst->path;
2827
2828 daddr = xfrm_get_dst_nexthop(dst, daddr);
63fca65d
JA		 2829 path->ops->confirm_neigh(path, daddr);
2830}
2831
a2817d8b 2832int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family)
1da177e4
LT		 2833{
2834 int err = 0;
a2817d8b
FW		 2835
2836 if (WARN_ON(family >= ARRAY_SIZE(xfrm_policy_afinfo)))
1da177e4 2837 return -EAFNOSUPPORT;
a2817d8b 2838
ef8531b6 2839 spin_lock(&xfrm_policy_afinfo_lock);
a2817d8b 2840 if (unlikely(xfrm_policy_afinfo[family] != NULL))
f31e8d4f 2841 err = -EEXIST;
1da177e4
LT		 2842 else {
2843 struct dst_ops *dst_ops = afinfo->dst_ops;
2844 if (likely(dst_ops->kmem_cachep == NULL))
2845 dst_ops->kmem_cachep = xfrm_dst_cache;
2846 if (likely(dst_ops->check == NULL))
2847 dst_ops->check = xfrm_dst_check;
0dbaee3b
DM		 2848 if (likely(dst_ops->default_advmss == NULL))
2849 dst_ops->default_advmss = xfrm_default_advmss;
ebb762f2
SK		 2850 if (likely(dst_ops->mtu == NULL))
2851 dst_ops->mtu = xfrm_mtu;
1da177e4
LT		 2852 if (likely(dst_ops->negative_advice == NULL))
2853 dst_ops->negative_advice = xfrm_negative_advice;
2854 if (likely(dst_ops->link_failure == NULL))
2855 dst_ops->link_failure = xfrm_link_failure;
d3aaeb38
DM		 2856 if (likely(dst_ops->neigh_lookup == NULL))
2857 dst_ops->neigh_lookup = xfrm_neigh_lookup;
63fca65d
JA		 2858 if (likely(!dst_ops->confirm_neigh))
2859 dst_ops->confirm_neigh = xfrm_confirm_neigh;
a2817d8b 2860 rcu_assign_pointer(xfrm_policy_afinfo[family], afinfo);
1da177e4 2861 }
ef8531b6 2862 spin_unlock(&xfrm_policy_afinfo_lock);
d7c7544c 2863
1da177e4
LT		 2864 return err;
2865}
2866EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2867
a2817d8b 2868void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo)
1da177e4 2869{
2b61997a 2870 struct dst_ops *dst_ops = afinfo->dst_ops;
a2817d8b 2871 int i;
2b61997a 2872
a2817d8b
FW		 2873 for (i = 0; i < ARRAY_SIZE(xfrm_policy_afinfo); i++) {
2874 if (xfrm_policy_afinfo[i] != afinfo)
2875 continue;
2876 RCU_INIT_POINTER(xfrm_policy_afinfo[i], NULL);
2877 break;
ef8531b6 2878 }
ef8531b6 2879
2b61997a 2880 synchronize_rcu();
ef8531b6 2881
2b61997a
FW		 2882 dst_ops->kmem_cachep = NULL;
2883 dst_ops->check = NULL;
2884 dst_ops->negative_advice = NULL;
2885 dst_ops->link_failure = NULL;
1da177e4
LT		 2886}
2887EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2888
558f82ef 2889#ifdef CONFIG_XFRM_STATISTICS
59c9940e 2890static int __net_init xfrm_statistics_init(struct net *net)
558f82ef 2891{
c68cd1a0 2892 int rv;
698365fa
WC		 2893 net->mib.xfrm_statistics = alloc_percpu(struct linux_xfrm_mib);
2894 if (!net->mib.xfrm_statistics)
558f82ef 2895 return -ENOMEM;
c68cd1a0
AD		 2896 rv = xfrm_proc_init(net);
2897 if (rv < 0)
698365fa 2898 free_percpu(net->mib.xfrm_statistics);
c68cd1a0 2899 return rv;
558f82ef 2900}
59c9940e
AD		 2901
2902static void xfrm_statistics_fini(struct net *net)
2903{
c68cd1a0 2904 xfrm_proc_fini(net);
698365fa 2905 free_percpu(net->mib.xfrm_statistics);
59c9940e
AD		 2906}
2907#else
2908static int __net_init xfrm_statistics_init(struct net *net)
2909{
2910 return 0;
2911}
2912
2913static void xfrm_statistics_fini(struct net *net)
2914{
2915}
558f82ef
MN		 2916#endif
2917
d62ddc21 2918static int __net_init xfrm_policy_init(struct net *net)
1da177e4 2919{
2518c7c2
DM		 2920 unsigned int hmask, sz;
2921 int dir;
2922
d62ddc21
AD		 2923 if (net_eq(net, &init_net))
2924 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
1da177e4 2925 sizeof(struct xfrm_dst),
e5d679f3 2926 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
20c2df83 2927 NULL);
1da177e4 2928
2518c7c2
DM		 2929 hmask = 8 - 1;
2930 sz = (hmask+1) * sizeof(struct hlist_head);
2931
93b851c1
AD		 2932 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2933 if (!net->xfrm.policy_byidx)
2934 goto out_byidx;
8100bea7 2935 net->xfrm.policy_idx_hmask = hmask;
2518c7c2 2936
53c2e285 2937 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
2518c7c2
DM		 2938 struct xfrm_policy_hash *htab;
2939
dc2caba7 2940 net->xfrm.policy_count[dir] = 0;
53c2e285 2941 net->xfrm.policy_count[XFRM_POLICY_MAX + dir] = 0;
8b18f8ea 2942 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
2518c7c2 2943
a35f6c5d 2944 htab = &net->xfrm.policy_bydst[dir];
44e36b42 2945 htab->table = xfrm_hash_alloc(sz);
2518c7c2 2946 if (!htab->table)
a35f6c5d
AD		 2947 goto out_bydst;
2948 htab->hmask = hmask;
b58555f1
CG		 2949 htab->dbits4 = 32;
2950 htab->sbits4 = 32;
2951 htab->dbits6 = 128;
2952 htab->sbits6 = 128;
2518c7c2 2953 }
880a6fab
CG		 2954 net->xfrm.policy_hthresh.lbits4 = 32;
2955 net->xfrm.policy_hthresh.rbits4 = 32;
2956 net->xfrm.policy_hthresh.lbits6 = 128;
2957 net->xfrm.policy_hthresh.rbits6 = 128;
2958
2959 seqlock_init(&net->xfrm.policy_hthresh.lock);
2518c7c2 2960
adfcf0b2 2961 INIT_LIST_HEAD(&net->xfrm.policy_all);
66caf628 2962 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
880a6fab 2963 INIT_WORK(&net->xfrm.policy_hthresh.work, xfrm_hash_rebuild);
d62ddc21 2964 if (net_eq(net, &init_net))
21f42cc9 2965 xfrm_dev_init();
d62ddc21 2966 return 0;
93b851c1 2967
a35f6c5d
AD		 2968out_bydst:
2969 for (dir--; dir >= 0; dir--) {
2970 struct xfrm_policy_hash *htab;
2971
2972 htab = &net->xfrm.policy_bydst[dir];
2973 xfrm_hash_free(htab->table, sz);
2974 }
2975 xfrm_hash_free(net->xfrm.policy_byidx, sz);
93b851c1
AD		 2976out_byidx:
2977 return -ENOMEM;
d62ddc21
AD		 2978}
2979
2980static void xfrm_policy_fini(struct net *net)
2981{
93b851c1 2982 unsigned int sz;
8b18f8ea 2983 int dir;
93b851c1 2984
7c2776ee
AD		 2985 flush_work(&net->xfrm.policy_hash_work);
2986#ifdef CONFIG_XFRM_SUB_POLICY
2e71029e 2987 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, false);
7c2776ee 2988#endif
2e71029e 2989 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, false);
7c2776ee 2990
adfcf0b2 2991 WARN_ON(!list_empty(&net->xfrm.policy_all));
93b851c1 2992
53c2e285 2993 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
a35f6c5d
AD		 2994 struct xfrm_policy_hash *htab;
2995
8b18f8ea 2996 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
a35f6c5d
AD		 2997
2998 htab = &net->xfrm.policy_bydst[dir];
5b653b2a 2999 sz = (htab->hmask + 1) * sizeof(struct hlist_head);
a35f6c5d
AD		 3000 WARN_ON(!hlist_empty(htab->table));
3001 xfrm_hash_free(htab->table, sz);
8b18f8ea
AD		 3002 }
3003
8100bea7 3004 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
93b851c1
AD		 3005 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
3006 xfrm_hash_free(net->xfrm.policy_byidx, sz);
1da177e4
LT		 3007}
3008
d62ddc21
AD		 3009static int __net_init xfrm_net_init(struct net *net)
3010{
3011 int rv;
3012
c282222a
FW		 3013 /* Initialize the per-net locks here */
3014 spin_lock_init(&net->xfrm.xfrm_state_lock);
3015 spin_lock_init(&net->xfrm.xfrm_policy_lock);
3016 mutex_init(&net->xfrm.xfrm_cfg_mutex);
3017
59c9940e
AD		 3018 rv = xfrm_statistics_init(net);
3019 if (rv < 0)
3020 goto out_statistics;
d62ddc21
AD		 3021 rv = xfrm_state_init(net);
3022 if (rv < 0)
3023 goto out_state;
3024 rv = xfrm_policy_init(net);
3025 if (rv < 0)
3026 goto out_policy;
b27aeadb
AD		 3027 rv = xfrm_sysctl_init(net);
3028 if (rv < 0)
3029 goto out_sysctl;
4a93f509
SK		 3030 rv = flow_cache_init(net);
3031 if (rv < 0)
3032 goto out;
283bc9f3 3033
d62ddc21
AD		 3034 return 0;
3035
4a93f509
SK		 3036out:
3037 xfrm_sysctl_fini(net);
b27aeadb
AD		 3038out_sysctl:
3039 xfrm_policy_fini(net);
d62ddc21
AD		 3040out_policy:
3041 xfrm_state_fini(net);
3042out_state:
59c9940e
AD		 3043 xfrm_statistics_fini(net);
3044out_statistics:
d62ddc21
AD		 3045 return rv;
3046}
3047
3048static void __net_exit xfrm_net_exit(struct net *net)
3049{
4a93f509 3050 flow_cache_fini(net);
b27aeadb 3051 xfrm_sysctl_fini(net);
d62ddc21
AD		 3052 xfrm_policy_fini(net);
3053 xfrm_state_fini(net);
59c9940e 3054 xfrm_statistics_fini(net);
d62ddc21
AD		 3055}
3056
3057static struct pernet_operations __net_initdata xfrm_net_ops = {
3058 .init = xfrm_net_init,
3059 .exit = xfrm_net_exit,
3060};
3061
1da177e4
LT		 3062void __init xfrm_init(void)
3063{
a4fc1bfc 3064 flow_cache_hp_init();
d62ddc21 3065 register_pernet_subsys(&xfrm_net_ops);
30846090 3066 seqcount_init(&xfrm_policy_hash_generation);
1da177e4
LT		 3067 xfrm_input_init();
3068}
3069
ab5f5e8b 3070#ifdef CONFIG_AUDITSYSCALL
1486cbd7
IJ		 3071static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
3072 struct audit_buffer *audit_buf)
ab5f5e8b 3073{
875179fa
PM		 3074 struct xfrm_sec_ctx *ctx = xp->security;
3075 struct xfrm_selector *sel = &xp->selector;
3076
3077 if (ctx)
ab5f5e8b 3078 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
875179fa 3079 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
ab5f5e8b 3080
9b7a787d 3081 switch (sel->family) {
ab5f5e8b 3082 case AF_INET:
21454aaa 3083 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
875179fa
PM		 3084 if (sel->prefixlen_s != 32)
3085 audit_log_format(audit_buf, " src_prefixlen=%d",
3086 sel->prefixlen_s);
21454aaa 3087 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
875179fa
PM		 3088 if (sel->prefixlen_d != 32)
3089 audit_log_format(audit_buf, " dst_prefixlen=%d",
3090 sel->prefixlen_d);
ab5f5e8b
JL		 3091 break;
3092 case AF_INET6:
5b095d98 3093 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
875179fa
PM		 3094 if (sel->prefixlen_s != 128)
3095 audit_log_format(audit_buf, " src_prefixlen=%d",
3096 sel->prefixlen_s);
5b095d98 3097 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
875179fa
PM		 3098 if (sel->prefixlen_d != 128)
3099 audit_log_format(audit_buf, " dst_prefixlen=%d",
3100 sel->prefixlen_d);
ab5f5e8b
JL		 3101 break;
3102 }
3103}
3104
2e71029e 3105void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid)
ab5f5e8b
JL		 3106{
3107 struct audit_buffer *audit_buf;
ab5f5e8b 3108
afeb14b4 3109 audit_buf = xfrm_audit_start("SPD-add");
ab5f5e8b
JL		 3110 if (audit_buf == NULL)
3111 return;
2e71029e 3112 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
afeb14b4 3113 audit_log_format(audit_buf, " res=%u", result);
ab5f5e8b
JL		 3114 xfrm_audit_common_policyinfo(xp, audit_buf);
3115 audit_log_end(audit_buf);
3116}
3117EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
3118
68277acc 3119void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
2e71029e 3120 bool task_valid)
ab5f5e8b
JL		 3121{
3122 struct audit_buffer *audit_buf;
ab5f5e8b 3123
afeb14b4 3124 audit_buf = xfrm_audit_start("SPD-delete");
ab5f5e8b
JL		 3125 if (audit_buf == NULL)
3126 return;
2e71029e 3127 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
afeb14b4 3128 audit_log_format(audit_buf, " res=%u", result);
ab5f5e8b
JL		 3129 xfrm_audit_common_policyinfo(xp, audit_buf);
3130 audit_log_end(audit_buf);
3131}
3132EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
3133#endif
3134
80c9abaa 3135#ifdef CONFIG_XFRM_MIGRATE
bc9b35ad
DM		 3136static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp,
3137 const struct xfrm_selector *sel_tgt)
80c9abaa
SS		 3138{
3139 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
3140 if (sel_tgt->family == sel_cmp->family &&
70e94e66
YH		 3141 xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr,
3142 sel_cmp->family) &&
3143 xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr,
3144 sel_cmp->family) &&
80c9abaa
SS		 3145 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
3146 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
bc9b35ad 3147 return true;
80c9abaa
SS		 3148 }
3149 } else {
3150 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
bc9b35ad 3151 return true;
80c9abaa
SS		 3152 }
3153 }
bc9b35ad 3154 return false;
80c9abaa
SS		 3155}
3156
3e94c2dc
WC		 3157static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel,
3158 u8 dir, u8 type, struct net *net)
80c9abaa
SS		 3159{
3160 struct xfrm_policy *pol, *ret = NULL;
80c9abaa
SS		 3161 struct hlist_head *chain;
3162 u32 priority = ~0U;
3163
9d0380df 3164 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
8d549c4f 3165 chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir);
b67bfe0d 3166 hlist_for_each_entry(pol, chain, bydst) {
80c9abaa
SS		 3167 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
3168 pol->type == type) {
3169 ret = pol;
3170 priority = ret->priority;
3171 break;
3172 }
3173 }
8d549c4f 3174 chain = &net->xfrm.policy_inexact[dir];
b67bfe0d 3175 hlist_for_each_entry(pol, chain, bydst) {
8faf491e
LR		 3176 if ((pol->priority >= priority) && ret)
3177 break;
3178
80c9abaa 3179 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
8faf491e 3180 pol->type == type) {
80c9abaa
SS		 3181 ret = pol;
3182 break;
3183 }
3184 }
3185
586f2eb4 3186 xfrm_pol_hold(ret);
80c9abaa 3187
9d0380df 3188 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
80c9abaa
SS		 3189
3190 return ret;
3191}
3192
dd701754 3193static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t)
80c9abaa
SS		 3194{
3195 int match = 0;
3196
3197 if (t->mode == m->mode && t->id.proto == m->proto &&
3198 (m->reqid == 0 || t->reqid == m->reqid)) {
3199 switch (t->mode) {
3200 case XFRM_MODE_TUNNEL:
3201 case XFRM_MODE_BEET:
70e94e66
YH		 3202 if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr,
3203 m->old_family) &&
3204 xfrm_addr_equal(&t->saddr, &m->old_saddr,
3205 m->old_family)) {
80c9abaa
SS		 3206 match = 1;
3207 }
3208 break;
3209 case XFRM_MODE_TRANSPORT:
3210 /* in case of transport mode, template does not store
3211 any IP addresses, hence we just compare mode and
3212 protocol */
3213 match = 1;
3214 break;
3215 default:
3216 break;
3217 }
3218 }
3219 return match;
3220}
3221
3222/* update endpoint address(es) of template(s) */
3223static int xfrm_policy_migrate(struct xfrm_policy *pol,
3224 struct xfrm_migrate *m, int num_migrate)
3225{
3226 struct xfrm_migrate *mp;
80c9abaa
SS		 3227 int i, j, n = 0;
3228
3229 write_lock_bh(&pol->lock);
12a169e7 3230 if (unlikely(pol->walk.dead)) {
80c9abaa
SS		 3231 /* target policy has been deleted */
3232 write_unlock_bh(&pol->lock);
3233 return -ENOENT;
3234 }
3235
3236 for (i = 0; i < pol->xfrm_nr; i++) {
3237 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
3238 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
3239 continue;
3240 n++;
1bfcb10f
HX		 3241 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
3242 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
80c9abaa
SS		 3243 continue;
3244 /* update endpoints */
3245 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
3246 sizeof(pol->xfrm_vec[i].id.daddr));
3247 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
3248 sizeof(pol->xfrm_vec[i].saddr));
3249 pol->xfrm_vec[i].encap_family = mp->new_family;
3250 /* flush bundles */
80c802f3 3251 atomic_inc(&pol->genid);
80c9abaa
SS		 3252 }
3253 }
3254
3255 write_unlock_bh(&pol->lock);
3256
3257 if (!n)
3258 return -ENODATA;
3259
3260 return 0;
3261}
3262
dd701754 3263static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate)
80c9abaa
SS		 3264{
3265 int i, j;
3266
3267 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
3268 return -EINVAL;
3269
3270 for (i = 0; i < num_migrate; i++) {
70e94e66
YH		 3271 if (xfrm_addr_equal(&m[i].old_daddr, &m[i].new_daddr,
3272 m[i].old_family) &&
3273 xfrm_addr_equal(&m[i].old_saddr, &m[i].new_saddr,
3274 m[i].old_family))
80c9abaa
SS		 3275 return -EINVAL;
3276 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
3277 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
3278 return -EINVAL;
3279
3280 /* check if there is any duplicated entry */
3281 for (j = i + 1; j < num_migrate; j++) {
3282 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
3283 sizeof(m[i].old_daddr)) &&
3284 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
3285 sizeof(m[i].old_saddr)) &&
3286 m[i].proto == m[j].proto &&
3287 m[i].mode == m[j].mode &&
3288 m[i].reqid == m[j].reqid &&
3289 m[i].old_family == m[j].old_family)
3290 return -EINVAL;
3291 }
3292 }
3293
3294 return 0;
3295}
3296
b4b7c0b3 3297int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
13c1d189 3298 struct xfrm_migrate *m, int num_migrate,
8d549c4f 3299 struct xfrm_kmaddress *k, struct net *net)
80c9abaa
SS		 3300{
3301 int i, err, nx_cur = 0, nx_new = 0;
3302 struct xfrm_policy *pol = NULL;
3303 struct xfrm_state *x, *xc;
3304 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
3305 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
3306 struct xfrm_migrate *mp;
3307
3308 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
3309 goto out;
3310
3311 /* Stage 1 - find policy */
8d549c4f 3312 if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) {
80c9abaa
SS		 3313 err = -ENOENT;
3314 goto out;
3315 }
3316
3317 /* Stage 2 - find and update state(s) */
3318 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
283bc9f3 3319 if ((x = xfrm_migrate_state_find(mp, net))) {
80c9abaa
SS		 3320 x_cur[nx_cur] = x;
3321 nx_cur++;
3322 if ((xc = xfrm_state_migrate(x, mp))) {
3323 x_new[nx_new] = xc;
3324 nx_new++;
3325 } else {
3326 err = -ENODATA;
3327 goto restore_state;
3328 }
3329 }
3330 }
3331
3332 /* Stage 3 - update policy */
3333 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
3334 goto restore_state;
3335
3336 /* Stage 4 - delete old state(s) */
3337 if (nx_cur) {
3338 xfrm_states_put(x_cur, nx_cur);
3339 xfrm_states_delete(x_cur, nx_cur);
3340 }
3341
3342 /* Stage 5 - announce */
13c1d189 3343 km_migrate(sel, dir, type, m, num_migrate, k);
80c9abaa
SS		 3344
3345 xfrm_pol_put(pol);
3346
3347 return 0;
3348out:
3349 return err;
3350
3351restore_state:
3352 if (pol)
3353 xfrm_pol_put(pol);
3354 if (nx_cur)
3355 xfrm_states_put(x_cur, nx_cur);
3356 if (nx_new)
3357 xfrm_states_delete(x_new, nx_new);
3358
3359 return err;
3360}
e610e679 3361EXPORT_SYMBOL(xfrm_migrate);
80c9abaa 3362#endif
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